5981 lines
150 KiB
C
5981 lines
150 KiB
C
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/*
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rbd.c -- Export ceph rados objects as a Linux block device
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based on drivers/block/osdblk.c:
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Copyright 2009 Red Hat, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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For usage instructions, please refer to:
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Documentation/ABI/testing/sysfs-bus-rbd
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*/
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#include <linux/ceph/libceph.h>
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#include <linux/ceph/osd_client.h>
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#include <linux/ceph/mon_client.h>
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#include <linux/ceph/cls_lock_client.h>
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#include <linux/ceph/striper.h>
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#include <linux/ceph/decode.h>
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#include <linux/parser.h>
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#include <linux/bsearch.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/blk-mq.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/idr.h>
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#include <linux/workqueue.h>
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#include "rbd_types.h"
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#define RBD_DEBUG /* Activate rbd_assert() calls */
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/*
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* Increment the given counter and return its updated value.
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* If the counter is already 0 it will not be incremented.
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* If the counter is already at its maximum value returns
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* -EINVAL without updating it.
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*/
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static int atomic_inc_return_safe(atomic_t *v)
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{
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unsigned int counter;
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counter = (unsigned int)__atomic_add_unless(v, 1, 0);
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if (counter <= (unsigned int)INT_MAX)
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return (int)counter;
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atomic_dec(v);
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return -EINVAL;
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}
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/* Decrement the counter. Return the resulting value, or -EINVAL */
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static int atomic_dec_return_safe(atomic_t *v)
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{
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int counter;
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counter = atomic_dec_return(v);
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if (counter >= 0)
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return counter;
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atomic_inc(v);
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return -EINVAL;
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}
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#define RBD_DRV_NAME "rbd"
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#define RBD_MINORS_PER_MAJOR 256
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#define RBD_SINGLE_MAJOR_PART_SHIFT 4
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#define RBD_MAX_PARENT_CHAIN_LEN 16
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#define RBD_SNAP_DEV_NAME_PREFIX "snap_"
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#define RBD_MAX_SNAP_NAME_LEN \
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(NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))
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#define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */
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#define RBD_SNAP_HEAD_NAME "-"
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#define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */
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/* This allows a single page to hold an image name sent by OSD */
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#define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1)
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#define RBD_IMAGE_ID_LEN_MAX 64
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#define RBD_OBJ_PREFIX_LEN_MAX 64
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#define RBD_NOTIFY_TIMEOUT 5 /* seconds */
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#define RBD_RETRY_DELAY msecs_to_jiffies(1000)
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/* Feature bits */
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#define RBD_FEATURE_LAYERING (1ULL<<0)
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#define RBD_FEATURE_STRIPINGV2 (1ULL<<1)
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#define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2)
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#define RBD_FEATURE_DATA_POOL (1ULL<<7)
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#define RBD_FEATURE_OPERATIONS (1ULL<<8)
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#define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \
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RBD_FEATURE_STRIPINGV2 | \
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RBD_FEATURE_EXCLUSIVE_LOCK | \
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RBD_FEATURE_DATA_POOL | \
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RBD_FEATURE_OPERATIONS)
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/* Features supported by this (client software) implementation. */
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#define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL)
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/*
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* An RBD device name will be "rbd#", where the "rbd" comes from
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* RBD_DRV_NAME above, and # is a unique integer identifier.
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*/
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#define DEV_NAME_LEN 32
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/*
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* block device image metadata (in-memory version)
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*/
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struct rbd_image_header {
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/* These six fields never change for a given rbd image */
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char *object_prefix;
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__u8 obj_order;
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u64 stripe_unit;
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u64 stripe_count;
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s64 data_pool_id;
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u64 features; /* Might be changeable someday? */
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/* The remaining fields need to be updated occasionally */
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u64 image_size;
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struct ceph_snap_context *snapc;
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char *snap_names; /* format 1 only */
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u64 *snap_sizes; /* format 1 only */
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};
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/*
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* An rbd image specification.
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*
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* The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
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* identify an image. Each rbd_dev structure includes a pointer to
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* an rbd_spec structure that encapsulates this identity.
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*
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* Each of the id's in an rbd_spec has an associated name. For a
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* user-mapped image, the names are supplied and the id's associated
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* with them are looked up. For a layered image, a parent image is
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* defined by the tuple, and the names are looked up.
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*
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* An rbd_dev structure contains a parent_spec pointer which is
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* non-null if the image it represents is a child in a layered
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* image. This pointer will refer to the rbd_spec structure used
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* by the parent rbd_dev for its own identity (i.e., the structure
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* is shared between the parent and child).
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*
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* Since these structures are populated once, during the discovery
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* phase of image construction, they are effectively immutable so
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* we make no effort to synchronize access to them.
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*
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* Note that code herein does not assume the image name is known (it
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* could be a null pointer).
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*/
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struct rbd_spec {
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u64 pool_id;
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const char *pool_name;
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const char *image_id;
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const char *image_name;
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u64 snap_id;
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const char *snap_name;
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struct kref kref;
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};
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/*
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* an instance of the client. multiple devices may share an rbd client.
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*/
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struct rbd_client {
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struct ceph_client *client;
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struct kref kref;
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struct list_head node;
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};
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struct rbd_img_request;
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enum obj_request_type {
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OBJ_REQUEST_NODATA = 1,
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OBJ_REQUEST_BIO, /* pointer into provided bio (list) */
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OBJ_REQUEST_BVECS, /* pointer into provided bio_vec array */
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OBJ_REQUEST_OWN_BVECS, /* private bio_vec array, doesn't own pages */
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};
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enum obj_operation_type {
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OBJ_OP_READ = 1,
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OBJ_OP_WRITE,
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OBJ_OP_DISCARD,
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};
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/*
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* Writes go through the following state machine to deal with
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* layering:
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*
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* need copyup
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* RBD_OBJ_WRITE_GUARD ---------------> RBD_OBJ_WRITE_COPYUP
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* | ^ |
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* v \------------------------------/
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* done
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* ^
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* |
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* RBD_OBJ_WRITE_FLAT
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*
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* Writes start in RBD_OBJ_WRITE_GUARD or _FLAT, depending on whether
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* there is a parent or not.
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*/
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enum rbd_obj_write_state {
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RBD_OBJ_WRITE_FLAT = 1,
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RBD_OBJ_WRITE_GUARD,
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RBD_OBJ_WRITE_COPYUP,
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};
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struct rbd_obj_request {
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struct ceph_object_extent ex;
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union {
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bool tried_parent; /* for reads */
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enum rbd_obj_write_state write_state; /* for writes */
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};
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struct rbd_img_request *img_request;
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struct ceph_file_extent *img_extents;
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u32 num_img_extents;
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union {
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struct ceph_bio_iter bio_pos;
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struct {
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struct ceph_bvec_iter bvec_pos;
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u32 bvec_count;
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u32 bvec_idx;
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};
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};
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struct bio_vec *copyup_bvecs;
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u32 copyup_bvec_count;
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struct ceph_osd_request *osd_req;
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u64 xferred; /* bytes transferred */
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int result;
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struct kref kref;
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};
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enum img_req_flags {
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IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */
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IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */
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};
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struct rbd_img_request {
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struct rbd_device *rbd_dev;
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enum obj_operation_type op_type;
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enum obj_request_type data_type;
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unsigned long flags;
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union {
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u64 snap_id; /* for reads */
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struct ceph_snap_context *snapc; /* for writes */
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};
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union {
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struct request *rq; /* block request */
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struct rbd_obj_request *obj_request; /* obj req initiator */
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};
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spinlock_t completion_lock;
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u64 xferred;/* aggregate bytes transferred */
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int result; /* first nonzero obj_request result */
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struct list_head object_extents; /* obj_req.ex structs */
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u32 obj_request_count;
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u32 pending_count;
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struct kref kref;
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};
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#define for_each_obj_request(ireq, oreq) \
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list_for_each_entry(oreq, &(ireq)->object_extents, ex.oe_item)
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#define for_each_obj_request_safe(ireq, oreq, n) \
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list_for_each_entry_safe(oreq, n, &(ireq)->object_extents, ex.oe_item)
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enum rbd_watch_state {
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RBD_WATCH_STATE_UNREGISTERED,
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RBD_WATCH_STATE_REGISTERED,
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RBD_WATCH_STATE_ERROR,
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};
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enum rbd_lock_state {
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RBD_LOCK_STATE_UNLOCKED,
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RBD_LOCK_STATE_LOCKED,
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RBD_LOCK_STATE_RELEASING,
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};
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/* WatchNotify::ClientId */
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struct rbd_client_id {
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u64 gid;
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u64 handle;
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};
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struct rbd_mapping {
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u64 size;
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u64 features;
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};
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/*
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* a single device
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*/
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struct rbd_device {
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int dev_id; /* blkdev unique id */
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int major; /* blkdev assigned major */
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int minor;
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struct gendisk *disk; /* blkdev's gendisk and rq */
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u32 image_format; /* Either 1 or 2 */
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struct rbd_client *rbd_client;
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char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */
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spinlock_t lock; /* queue, flags, open_count */
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struct rbd_image_header header;
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unsigned long flags; /* possibly lock protected */
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struct rbd_spec *spec;
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struct rbd_options *opts;
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char *config_info; /* add{,_single_major} string */
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struct ceph_object_id header_oid;
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struct ceph_object_locator header_oloc;
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struct ceph_file_layout layout; /* used for all rbd requests */
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struct mutex watch_mutex;
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enum rbd_watch_state watch_state;
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struct ceph_osd_linger_request *watch_handle;
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u64 watch_cookie;
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struct delayed_work watch_dwork;
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struct rw_semaphore lock_rwsem;
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enum rbd_lock_state lock_state;
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char lock_cookie[32];
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struct rbd_client_id owner_cid;
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struct work_struct acquired_lock_work;
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struct work_struct released_lock_work;
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struct delayed_work lock_dwork;
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struct work_struct unlock_work;
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wait_queue_head_t lock_waitq;
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struct workqueue_struct *task_wq;
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struct rbd_spec *parent_spec;
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u64 parent_overlap;
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atomic_t parent_ref;
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struct rbd_device *parent;
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/* Block layer tags. */
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struct blk_mq_tag_set tag_set;
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/* protects updating the header */
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struct rw_semaphore header_rwsem;
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struct rbd_mapping mapping;
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struct list_head node;
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/* sysfs related */
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struct device dev;
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unsigned long open_count; /* protected by lock */
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};
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/*
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* Flag bits for rbd_dev->flags:
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* - REMOVING (which is coupled with rbd_dev->open_count) is protected
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* by rbd_dev->lock
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* - BLACKLISTED is protected by rbd_dev->lock_rwsem
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*/
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enum rbd_dev_flags {
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RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */
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RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */
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RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */
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};
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static DEFINE_MUTEX(client_mutex); /* Serialize client creation */
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static LIST_HEAD(rbd_dev_list); /* devices */
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static DEFINE_SPINLOCK(rbd_dev_list_lock);
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static LIST_HEAD(rbd_client_list); /* clients */
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static DEFINE_SPINLOCK(rbd_client_list_lock);
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/* Slab caches for frequently-allocated structures */
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static struct kmem_cache *rbd_img_request_cache;
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static struct kmem_cache *rbd_obj_request_cache;
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static int rbd_major;
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static DEFINE_IDA(rbd_dev_id_ida);
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static struct workqueue_struct *rbd_wq;
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/*
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* single-major requires >= 0.75 version of userspace rbd utility.
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*/
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static bool single_major = true;
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module_param(single_major, bool, S_IRUGO);
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MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)");
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static ssize_t rbd_add(struct bus_type *bus, const char *buf,
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size_t count);
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static ssize_t rbd_remove(struct bus_type *bus, const char *buf,
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size_t count);
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static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf,
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size_t count);
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static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf,
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size_t count);
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static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth);
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static int rbd_dev_id_to_minor(int dev_id)
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{
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return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT;
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}
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static int minor_to_rbd_dev_id(int minor)
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{
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return minor >> RBD_SINGLE_MAJOR_PART_SHIFT;
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}
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static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev)
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{
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return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED ||
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rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING;
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}
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static bool rbd_is_lock_owner(struct rbd_device *rbd_dev)
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{
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bool is_lock_owner;
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down_read(&rbd_dev->lock_rwsem);
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is_lock_owner = __rbd_is_lock_owner(rbd_dev);
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up_read(&rbd_dev->lock_rwsem);
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return is_lock_owner;
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}
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static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf)
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{
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return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED);
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}
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static BUS_ATTR(add, S_IWUSR, NULL, rbd_add);
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static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove);
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static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major);
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static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major);
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static BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL);
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static struct attribute *rbd_bus_attrs[] = {
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&bus_attr_add.attr,
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&bus_attr_remove.attr,
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&bus_attr_add_single_major.attr,
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&bus_attr_remove_single_major.attr,
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&bus_attr_supported_features.attr,
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NULL,
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};
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static umode_t rbd_bus_is_visible(struct kobject *kobj,
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struct attribute *attr, int index)
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{
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if (!single_major &&
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(attr == &bus_attr_add_single_major.attr ||
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attr == &bus_attr_remove_single_major.attr))
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return 0;
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return attr->mode;
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}
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static const struct attribute_group rbd_bus_group = {
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.attrs = rbd_bus_attrs,
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.is_visible = rbd_bus_is_visible,
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};
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__ATTRIBUTE_GROUPS(rbd_bus);
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static struct bus_type rbd_bus_type = {
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.name = "rbd",
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.bus_groups = rbd_bus_groups,
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};
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static void rbd_root_dev_release(struct device *dev)
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{
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}
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static struct device rbd_root_dev = {
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.init_name = "rbd",
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.release = rbd_root_dev_release,
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};
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static __printf(2, 3)
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void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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|
|
if (!rbd_dev)
|
|
printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf);
|
|
else if (rbd_dev->disk)
|
|
printk(KERN_WARNING "%s: %s: %pV\n",
|
|
RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf);
|
|
else if (rbd_dev->spec && rbd_dev->spec->image_name)
|
|
printk(KERN_WARNING "%s: image %s: %pV\n",
|
|
RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf);
|
|
else if (rbd_dev->spec && rbd_dev->spec->image_id)
|
|
printk(KERN_WARNING "%s: id %s: %pV\n",
|
|
RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf);
|
|
else /* punt */
|
|
printk(KERN_WARNING "%s: rbd_dev %p: %pV\n",
|
|
RBD_DRV_NAME, rbd_dev, &vaf);
|
|
va_end(args);
|
|
}
|
|
|
|
#ifdef RBD_DEBUG
|
|
#define rbd_assert(expr) \
|
|
if (unlikely(!(expr))) { \
|
|
printk(KERN_ERR "\nAssertion failure in %s() " \
|
|
"at line %d:\n\n" \
|
|
"\trbd_assert(%s);\n\n", \
|
|
__func__, __LINE__, #expr); \
|
|
BUG(); \
|
|
}
|
|
#else /* !RBD_DEBUG */
|
|
# define rbd_assert(expr) ((void) 0)
|
|
#endif /* !RBD_DEBUG */
|
|
|
|
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev);
|
|
|
|
static int rbd_dev_refresh(struct rbd_device *rbd_dev);
|
|
static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev);
|
|
static int rbd_dev_header_info(struct rbd_device *rbd_dev);
|
|
static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev);
|
|
static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
|
|
u64 snap_id);
|
|
static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u8 *order, u64 *snap_size);
|
|
static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_features);
|
|
|
|
static int rbd_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
|
|
bool removing = false;
|
|
|
|
spin_lock_irq(&rbd_dev->lock);
|
|
if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags))
|
|
removing = true;
|
|
else
|
|
rbd_dev->open_count++;
|
|
spin_unlock_irq(&rbd_dev->lock);
|
|
if (removing)
|
|
return -ENOENT;
|
|
|
|
(void) get_device(&rbd_dev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rbd_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
struct rbd_device *rbd_dev = disk->private_data;
|
|
unsigned long open_count_before;
|
|
|
|
spin_lock_irq(&rbd_dev->lock);
|
|
open_count_before = rbd_dev->open_count--;
|
|
spin_unlock_irq(&rbd_dev->lock);
|
|
rbd_assert(open_count_before > 0);
|
|
|
|
put_device(&rbd_dev->dev);
|
|
}
|
|
|
|
static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg)
|
|
{
|
|
int ro;
|
|
|
|
if (get_user(ro, (int __user *)arg))
|
|
return -EFAULT;
|
|
|
|
/* Snapshots can't be marked read-write */
|
|
if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro)
|
|
return -EROFS;
|
|
|
|
/* Let blkdev_roset() handle it */
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static int rbd_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct rbd_device *rbd_dev = bdev->bd_disk->private_data;
|
|
int ret;
|
|
|
|
switch (cmd) {
|
|
case BLKROSET:
|
|
ret = rbd_ioctl_set_ro(rbd_dev, arg);
|
|
break;
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return rbd_ioctl(bdev, mode, cmd, arg);
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static const struct block_device_operations rbd_bd_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rbd_open,
|
|
.release = rbd_release,
|
|
.ioctl = rbd_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = rbd_compat_ioctl,
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Initialize an rbd client instance. Success or not, this function
|
|
* consumes ceph_opts. Caller holds client_mutex.
|
|
*/
|
|
static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts)
|
|
{
|
|
struct rbd_client *rbdc;
|
|
int ret = -ENOMEM;
|
|
|
|
dout("%s:\n", __func__);
|
|
rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL);
|
|
if (!rbdc)
|
|
goto out_opt;
|
|
|
|
kref_init(&rbdc->kref);
|
|
INIT_LIST_HEAD(&rbdc->node);
|
|
|
|
rbdc->client = ceph_create_client(ceph_opts, rbdc);
|
|
if (IS_ERR(rbdc->client))
|
|
goto out_rbdc;
|
|
ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */
|
|
|
|
ret = ceph_open_session(rbdc->client);
|
|
if (ret < 0)
|
|
goto out_client;
|
|
|
|
spin_lock(&rbd_client_list_lock);
|
|
list_add_tail(&rbdc->node, &rbd_client_list);
|
|
spin_unlock(&rbd_client_list_lock);
|
|
|
|
dout("%s: rbdc %p\n", __func__, rbdc);
|
|
|
|
return rbdc;
|
|
out_client:
|
|
ceph_destroy_client(rbdc->client);
|
|
out_rbdc:
|
|
kfree(rbdc);
|
|
out_opt:
|
|
if (ceph_opts)
|
|
ceph_destroy_options(ceph_opts);
|
|
dout("%s: error %d\n", __func__, ret);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc)
|
|
{
|
|
kref_get(&rbdc->kref);
|
|
|
|
return rbdc;
|
|
}
|
|
|
|
/*
|
|
* Find a ceph client with specific addr and configuration. If
|
|
* found, bump its reference count.
|
|
*/
|
|
static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts)
|
|
{
|
|
struct rbd_client *client_node;
|
|
bool found = false;
|
|
|
|
if (ceph_opts->flags & CEPH_OPT_NOSHARE)
|
|
return NULL;
|
|
|
|
spin_lock(&rbd_client_list_lock);
|
|
list_for_each_entry(client_node, &rbd_client_list, node) {
|
|
if (!ceph_compare_options(ceph_opts, client_node->client)) {
|
|
__rbd_get_client(client_node);
|
|
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&rbd_client_list_lock);
|
|
|
|
return found ? client_node : NULL;
|
|
}
|
|
|
|
/*
|
|
* (Per device) rbd map options
|
|
*/
|
|
enum {
|
|
Opt_queue_depth,
|
|
Opt_last_int,
|
|
/* int args above */
|
|
Opt_last_string,
|
|
/* string args above */
|
|
Opt_read_only,
|
|
Opt_read_write,
|
|
Opt_lock_on_read,
|
|
Opt_exclusive,
|
|
Opt_err
|
|
};
|
|
|
|
static match_table_t rbd_opts_tokens = {
|
|
{Opt_queue_depth, "queue_depth=%d"},
|
|
/* int args above */
|
|
/* string args above */
|
|
{Opt_read_only, "read_only"},
|
|
{Opt_read_only, "ro"}, /* Alternate spelling */
|
|
{Opt_read_write, "read_write"},
|
|
{Opt_read_write, "rw"}, /* Alternate spelling */
|
|
{Opt_lock_on_read, "lock_on_read"},
|
|
{Opt_exclusive, "exclusive"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
struct rbd_options {
|
|
int queue_depth;
|
|
bool read_only;
|
|
bool lock_on_read;
|
|
bool exclusive;
|
|
};
|
|
|
|
#define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ
|
|
#define RBD_READ_ONLY_DEFAULT false
|
|
#define RBD_LOCK_ON_READ_DEFAULT false
|
|
#define RBD_EXCLUSIVE_DEFAULT false
|
|
|
|
static int parse_rbd_opts_token(char *c, void *private)
|
|
{
|
|
struct rbd_options *rbd_opts = private;
|
|
substring_t argstr[MAX_OPT_ARGS];
|
|
int token, intval, ret;
|
|
|
|
token = match_token(c, rbd_opts_tokens, argstr);
|
|
if (token < Opt_last_int) {
|
|
ret = match_int(&argstr[0], &intval);
|
|
if (ret < 0) {
|
|
pr_err("bad mount option arg (not int) at '%s'\n", c);
|
|
return ret;
|
|
}
|
|
dout("got int token %d val %d\n", token, intval);
|
|
} else if (token > Opt_last_int && token < Opt_last_string) {
|
|
dout("got string token %d val %s\n", token, argstr[0].from);
|
|
} else {
|
|
dout("got token %d\n", token);
|
|
}
|
|
|
|
switch (token) {
|
|
case Opt_queue_depth:
|
|
if (intval < 1) {
|
|
pr_err("queue_depth out of range\n");
|
|
return -EINVAL;
|
|
}
|
|
rbd_opts->queue_depth = intval;
|
|
break;
|
|
case Opt_read_only:
|
|
rbd_opts->read_only = true;
|
|
break;
|
|
case Opt_read_write:
|
|
rbd_opts->read_only = false;
|
|
break;
|
|
case Opt_lock_on_read:
|
|
rbd_opts->lock_on_read = true;
|
|
break;
|
|
case Opt_exclusive:
|
|
rbd_opts->exclusive = true;
|
|
break;
|
|
default:
|
|
/* libceph prints "bad option" msg */
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char* obj_op_name(enum obj_operation_type op_type)
|
|
{
|
|
switch (op_type) {
|
|
case OBJ_OP_READ:
|
|
return "read";
|
|
case OBJ_OP_WRITE:
|
|
return "write";
|
|
case OBJ_OP_DISCARD:
|
|
return "discard";
|
|
default:
|
|
return "???";
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Destroy ceph client
|
|
*
|
|
* Caller must hold rbd_client_list_lock.
|
|
*/
|
|
static void rbd_client_release(struct kref *kref)
|
|
{
|
|
struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref);
|
|
|
|
dout("%s: rbdc %p\n", __func__, rbdc);
|
|
spin_lock(&rbd_client_list_lock);
|
|
list_del(&rbdc->node);
|
|
spin_unlock(&rbd_client_list_lock);
|
|
|
|
ceph_destroy_client(rbdc->client);
|
|
kfree(rbdc);
|
|
}
|
|
|
|
/*
|
|
* Drop reference to ceph client node. If it's not referenced anymore, release
|
|
* it.
|
|
*/
|
|
static void rbd_put_client(struct rbd_client *rbdc)
|
|
{
|
|
if (rbdc)
|
|
kref_put(&rbdc->kref, rbd_client_release);
|
|
}
|
|
|
|
static int wait_for_latest_osdmap(struct ceph_client *client)
|
|
{
|
|
u64 newest_epoch;
|
|
int ret;
|
|
|
|
ret = ceph_monc_get_version(&client->monc, "osdmap", &newest_epoch);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (client->osdc.osdmap->epoch >= newest_epoch)
|
|
return 0;
|
|
|
|
ceph_osdc_maybe_request_map(&client->osdc);
|
|
return ceph_monc_wait_osdmap(&client->monc, newest_epoch,
|
|
client->options->mount_timeout);
|
|
}
|
|
|
|
/*
|
|
* Get a ceph client with specific addr and configuration, if one does
|
|
* not exist create it. Either way, ceph_opts is consumed by this
|
|
* function.
|
|
*/
|
|
static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts)
|
|
{
|
|
struct rbd_client *rbdc;
|
|
int ret;
|
|
|
|
mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING);
|
|
rbdc = rbd_client_find(ceph_opts);
|
|
if (rbdc) {
|
|
ceph_destroy_options(ceph_opts);
|
|
|
|
/*
|
|
* Using an existing client. Make sure ->pg_pools is up to
|
|
* date before we look up the pool id in do_rbd_add().
|
|
*/
|
|
ret = wait_for_latest_osdmap(rbdc->client);
|
|
if (ret) {
|
|
rbd_warn(NULL, "failed to get latest osdmap: %d", ret);
|
|
rbd_put_client(rbdc);
|
|
rbdc = ERR_PTR(ret);
|
|
}
|
|
} else {
|
|
rbdc = rbd_client_create(ceph_opts);
|
|
}
|
|
mutex_unlock(&client_mutex);
|
|
|
|
return rbdc;
|
|
}
|
|
|
|
static bool rbd_image_format_valid(u32 image_format)
|
|
{
|
|
return image_format == 1 || image_format == 2;
|
|
}
|
|
|
|
static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk)
|
|
{
|
|
size_t size;
|
|
u32 snap_count;
|
|
|
|
/* The header has to start with the magic rbd header text */
|
|
if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT)))
|
|
return false;
|
|
|
|
/* The bio layer requires at least sector-sized I/O */
|
|
|
|
if (ondisk->options.order < SECTOR_SHIFT)
|
|
return false;
|
|
|
|
/* If we use u64 in a few spots we may be able to loosen this */
|
|
|
|
if (ondisk->options.order > 8 * sizeof (int) - 1)
|
|
return false;
|
|
|
|
/*
|
|
* The size of a snapshot header has to fit in a size_t, and
|
|
* that limits the number of snapshots.
|
|
*/
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
size = SIZE_MAX - sizeof (struct ceph_snap_context);
|
|
if (snap_count > size / sizeof (__le64))
|
|
return false;
|
|
|
|
/*
|
|
* Not only that, but the size of the entire the snapshot
|
|
* header must also be representable in a size_t.
|
|
*/
|
|
size -= snap_count * sizeof (__le64);
|
|
if ((u64) size < le64_to_cpu(ondisk->snap_names_len))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* returns the size of an object in the image
|
|
*/
|
|
static u32 rbd_obj_bytes(struct rbd_image_header *header)
|
|
{
|
|
return 1U << header->obj_order;
|
|
}
|
|
|
|
static void rbd_init_layout(struct rbd_device *rbd_dev)
|
|
{
|
|
if (rbd_dev->header.stripe_unit == 0 ||
|
|
rbd_dev->header.stripe_count == 0) {
|
|
rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header);
|
|
rbd_dev->header.stripe_count = 1;
|
|
}
|
|
|
|
rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit;
|
|
rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count;
|
|
rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header);
|
|
rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ?
|
|
rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id;
|
|
RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL);
|
|
}
|
|
|
|
/*
|
|
* Fill an rbd image header with information from the given format 1
|
|
* on-disk header.
|
|
*/
|
|
static int rbd_header_from_disk(struct rbd_device *rbd_dev,
|
|
struct rbd_image_header_ondisk *ondisk)
|
|
{
|
|
struct rbd_image_header *header = &rbd_dev->header;
|
|
bool first_time = header->object_prefix == NULL;
|
|
struct ceph_snap_context *snapc;
|
|
char *object_prefix = NULL;
|
|
char *snap_names = NULL;
|
|
u64 *snap_sizes = NULL;
|
|
u32 snap_count;
|
|
int ret = -ENOMEM;
|
|
u32 i;
|
|
|
|
/* Allocate this now to avoid having to handle failure below */
|
|
|
|
if (first_time) {
|
|
object_prefix = kstrndup(ondisk->object_prefix,
|
|
sizeof(ondisk->object_prefix),
|
|
GFP_KERNEL);
|
|
if (!object_prefix)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Allocate the snapshot context and fill it in */
|
|
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
snapc = ceph_create_snap_context(snap_count, GFP_KERNEL);
|
|
if (!snapc)
|
|
goto out_err;
|
|
snapc->seq = le64_to_cpu(ondisk->snap_seq);
|
|
if (snap_count) {
|
|
struct rbd_image_snap_ondisk *snaps;
|
|
u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len);
|
|
|
|
/* We'll keep a copy of the snapshot names... */
|
|
|
|
if (snap_names_len > (u64)SIZE_MAX)
|
|
goto out_2big;
|
|
snap_names = kmalloc(snap_names_len, GFP_KERNEL);
|
|
if (!snap_names)
|
|
goto out_err;
|
|
|
|
/* ...as well as the array of their sizes. */
|
|
snap_sizes = kmalloc_array(snap_count,
|
|
sizeof(*header->snap_sizes),
|
|
GFP_KERNEL);
|
|
if (!snap_sizes)
|
|
goto out_err;
|
|
|
|
/*
|
|
* Copy the names, and fill in each snapshot's id
|
|
* and size.
|
|
*
|
|
* Note that rbd_dev_v1_header_info() guarantees the
|
|
* ondisk buffer we're working with has
|
|
* snap_names_len bytes beyond the end of the
|
|
* snapshot id array, this memcpy() is safe.
|
|
*/
|
|
memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len);
|
|
snaps = ondisk->snaps;
|
|
for (i = 0; i < snap_count; i++) {
|
|
snapc->snaps[i] = le64_to_cpu(snaps[i].id);
|
|
snap_sizes[i] = le64_to_cpu(snaps[i].image_size);
|
|
}
|
|
}
|
|
|
|
/* We won't fail any more, fill in the header */
|
|
|
|
if (first_time) {
|
|
header->object_prefix = object_prefix;
|
|
header->obj_order = ondisk->options.order;
|
|
rbd_init_layout(rbd_dev);
|
|
} else {
|
|
ceph_put_snap_context(header->snapc);
|
|
kfree(header->snap_names);
|
|
kfree(header->snap_sizes);
|
|
}
|
|
|
|
/* The remaining fields always get updated (when we refresh) */
|
|
|
|
header->image_size = le64_to_cpu(ondisk->image_size);
|
|
header->snapc = snapc;
|
|
header->snap_names = snap_names;
|
|
header->snap_sizes = snap_sizes;
|
|
|
|
return 0;
|
|
out_2big:
|
|
ret = -EIO;
|
|
out_err:
|
|
kfree(snap_sizes);
|
|
kfree(snap_names);
|
|
ceph_put_snap_context(snapc);
|
|
kfree(object_prefix);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which)
|
|
{
|
|
const char *snap_name;
|
|
|
|
rbd_assert(which < rbd_dev->header.snapc->num_snaps);
|
|
|
|
/* Skip over names until we find the one we are looking for */
|
|
|
|
snap_name = rbd_dev->header.snap_names;
|
|
while (which--)
|
|
snap_name += strlen(snap_name) + 1;
|
|
|
|
return kstrdup(snap_name, GFP_KERNEL);
|
|
}
|
|
|
|
/*
|
|
* Snapshot id comparison function for use with qsort()/bsearch().
|
|
* Note that result is for snapshots in *descending* order.
|
|
*/
|
|
static int snapid_compare_reverse(const void *s1, const void *s2)
|
|
{
|
|
u64 snap_id1 = *(u64 *)s1;
|
|
u64 snap_id2 = *(u64 *)s2;
|
|
|
|
if (snap_id1 < snap_id2)
|
|
return 1;
|
|
return snap_id1 == snap_id2 ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* Search a snapshot context to see if the given snapshot id is
|
|
* present.
|
|
*
|
|
* Returns the position of the snapshot id in the array if it's found,
|
|
* or BAD_SNAP_INDEX otherwise.
|
|
*
|
|
* Note: The snapshot array is in kept sorted (by the osd) in
|
|
* reverse order, highest snapshot id first.
|
|
*/
|
|
static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id)
|
|
{
|
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc;
|
|
u64 *found;
|
|
|
|
found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps,
|
|
sizeof (snap_id), snapid_compare_reverse);
|
|
|
|
return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX;
|
|
}
|
|
|
|
static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev,
|
|
u64 snap_id)
|
|
{
|
|
u32 which;
|
|
const char *snap_name;
|
|
|
|
which = rbd_dev_snap_index(rbd_dev, snap_id);
|
|
if (which == BAD_SNAP_INDEX)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
snap_name = _rbd_dev_v1_snap_name(rbd_dev, which);
|
|
return snap_name ? snap_name : ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id)
|
|
{
|
|
if (snap_id == CEPH_NOSNAP)
|
|
return RBD_SNAP_HEAD_NAME;
|
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
if (rbd_dev->image_format == 1)
|
|
return rbd_dev_v1_snap_name(rbd_dev, snap_id);
|
|
|
|
return rbd_dev_v2_snap_name(rbd_dev, snap_id);
|
|
}
|
|
|
|
static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_size)
|
|
{
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
if (snap_id == CEPH_NOSNAP) {
|
|
*snap_size = rbd_dev->header.image_size;
|
|
} else if (rbd_dev->image_format == 1) {
|
|
u32 which;
|
|
|
|
which = rbd_dev_snap_index(rbd_dev, snap_id);
|
|
if (which == BAD_SNAP_INDEX)
|
|
return -ENOENT;
|
|
|
|
*snap_size = rbd_dev->header.snap_sizes[which];
|
|
} else {
|
|
u64 size = 0;
|
|
int ret;
|
|
|
|
ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*snap_size = size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_features)
|
|
{
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
if (snap_id == CEPH_NOSNAP) {
|
|
*snap_features = rbd_dev->header.features;
|
|
} else if (rbd_dev->image_format == 1) {
|
|
*snap_features = 0; /* No features for format 1 */
|
|
} else {
|
|
u64 features = 0;
|
|
int ret;
|
|
|
|
ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*snap_features = features;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_mapping_set(struct rbd_device *rbd_dev)
|
|
{
|
|
u64 snap_id = rbd_dev->spec->snap_id;
|
|
u64 size = 0;
|
|
u64 features = 0;
|
|
int ret;
|
|
|
|
ret = rbd_snap_size(rbd_dev, snap_id, &size);
|
|
if (ret)
|
|
return ret;
|
|
ret = rbd_snap_features(rbd_dev, snap_id, &features);
|
|
if (ret)
|
|
return ret;
|
|
|
|
rbd_dev->mapping.size = size;
|
|
rbd_dev->mapping.features = features;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev->mapping.size = 0;
|
|
rbd_dev->mapping.features = 0;
|
|
}
|
|
|
|
static void zero_bvec(struct bio_vec *bv)
|
|
{
|
|
void *buf;
|
|
unsigned long flags;
|
|
|
|
buf = bvec_kmap_irq(bv, &flags);
|
|
memset(buf, 0, bv->bv_len);
|
|
flush_dcache_page(bv->bv_page);
|
|
bvec_kunmap_irq(buf, &flags);
|
|
}
|
|
|
|
static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes)
|
|
{
|
|
struct ceph_bio_iter it = *bio_pos;
|
|
|
|
ceph_bio_iter_advance(&it, off);
|
|
ceph_bio_iter_advance_step(&it, bytes, ({
|
|
zero_bvec(&bv);
|
|
}));
|
|
}
|
|
|
|
static void zero_bvecs(struct ceph_bvec_iter *bvec_pos, u32 off, u32 bytes)
|
|
{
|
|
struct ceph_bvec_iter it = *bvec_pos;
|
|
|
|
ceph_bvec_iter_advance(&it, off);
|
|
ceph_bvec_iter_advance_step(&it, bytes, ({
|
|
zero_bvec(&bv);
|
|
}));
|
|
}
|
|
|
|
/*
|
|
* Zero a range in @obj_req data buffer defined by a bio (list) or
|
|
* (private) bio_vec array.
|
|
*
|
|
* @off is relative to the start of the data buffer.
|
|
*/
|
|
static void rbd_obj_zero_range(struct rbd_obj_request *obj_req, u32 off,
|
|
u32 bytes)
|
|
{
|
|
switch (obj_req->img_request->data_type) {
|
|
case OBJ_REQUEST_BIO:
|
|
zero_bios(&obj_req->bio_pos, off, bytes);
|
|
break;
|
|
case OBJ_REQUEST_BVECS:
|
|
case OBJ_REQUEST_OWN_BVECS:
|
|
zero_bvecs(&obj_req->bvec_pos, off, bytes);
|
|
break;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
}
|
|
|
|
static void rbd_obj_request_destroy(struct kref *kref);
|
|
static void rbd_obj_request_put(struct rbd_obj_request *obj_request)
|
|
{
|
|
rbd_assert(obj_request != NULL);
|
|
dout("%s: obj %p (was %d)\n", __func__, obj_request,
|
|
kref_read(&obj_request->kref));
|
|
kref_put(&obj_request->kref, rbd_obj_request_destroy);
|
|
}
|
|
|
|
static void rbd_img_request_get(struct rbd_img_request *img_request)
|
|
{
|
|
dout("%s: img %p (was %d)\n", __func__, img_request,
|
|
kref_read(&img_request->kref));
|
|
kref_get(&img_request->kref);
|
|
}
|
|
|
|
static void rbd_img_request_destroy(struct kref *kref);
|
|
static void rbd_img_request_put(struct rbd_img_request *img_request)
|
|
{
|
|
rbd_assert(img_request != NULL);
|
|
dout("%s: img %p (was %d)\n", __func__, img_request,
|
|
kref_read(&img_request->kref));
|
|
kref_put(&img_request->kref, rbd_img_request_destroy);
|
|
}
|
|
|
|
static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request,
|
|
struct rbd_obj_request *obj_request)
|
|
{
|
|
rbd_assert(obj_request->img_request == NULL);
|
|
|
|
/* Image request now owns object's original reference */
|
|
obj_request->img_request = img_request;
|
|
img_request->obj_request_count++;
|
|
img_request->pending_count++;
|
|
dout("%s: img %p obj %p\n", __func__, img_request, obj_request);
|
|
}
|
|
|
|
static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request,
|
|
struct rbd_obj_request *obj_request)
|
|
{
|
|
dout("%s: img %p obj %p\n", __func__, img_request, obj_request);
|
|
list_del(&obj_request->ex.oe_item);
|
|
rbd_assert(img_request->obj_request_count > 0);
|
|
img_request->obj_request_count--;
|
|
rbd_assert(obj_request->img_request == img_request);
|
|
rbd_obj_request_put(obj_request);
|
|
}
|
|
|
|
static void rbd_obj_request_submit(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct ceph_osd_request *osd_req = obj_request->osd_req;
|
|
|
|
dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__,
|
|
obj_request, obj_request->ex.oe_objno, obj_request->ex.oe_off,
|
|
obj_request->ex.oe_len, osd_req);
|
|
ceph_osdc_start_request(osd_req->r_osdc, osd_req, false);
|
|
}
|
|
|
|
/*
|
|
* The default/initial value for all image request flags is 0. Each
|
|
* is conditionally set to 1 at image request initialization time
|
|
* and currently never change thereafter.
|
|
*/
|
|
static void img_request_layered_set(struct rbd_img_request *img_request)
|
|
{
|
|
set_bit(IMG_REQ_LAYERED, &img_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static void img_request_layered_clear(struct rbd_img_request *img_request)
|
|
{
|
|
clear_bit(IMG_REQ_LAYERED, &img_request->flags);
|
|
smp_mb();
|
|
}
|
|
|
|
static bool img_request_layered_test(struct rbd_img_request *img_request)
|
|
{
|
|
smp_mb();
|
|
return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0;
|
|
}
|
|
|
|
static bool rbd_obj_is_entire(struct rbd_obj_request *obj_req)
|
|
{
|
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
|
|
|
|
return !obj_req->ex.oe_off &&
|
|
obj_req->ex.oe_len == rbd_dev->layout.object_size;
|
|
}
|
|
|
|
static bool rbd_obj_is_tail(struct rbd_obj_request *obj_req)
|
|
{
|
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
|
|
|
|
return obj_req->ex.oe_off + obj_req->ex.oe_len ==
|
|
rbd_dev->layout.object_size;
|
|
}
|
|
|
|
static u64 rbd_obj_img_extents_bytes(struct rbd_obj_request *obj_req)
|
|
{
|
|
return ceph_file_extents_bytes(obj_req->img_extents,
|
|
obj_req->num_img_extents);
|
|
}
|
|
|
|
static bool rbd_img_is_write(struct rbd_img_request *img_req)
|
|
{
|
|
switch (img_req->op_type) {
|
|
case OBJ_OP_READ:
|
|
return false;
|
|
case OBJ_OP_WRITE:
|
|
case OBJ_OP_DISCARD:
|
|
return true;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
}
|
|
|
|
static void rbd_obj_handle_request(struct rbd_obj_request *obj_req);
|
|
|
|
static void rbd_osd_req_callback(struct ceph_osd_request *osd_req)
|
|
{
|
|
struct rbd_obj_request *obj_req = osd_req->r_priv;
|
|
|
|
dout("%s osd_req %p result %d for obj_req %p\n", __func__, osd_req,
|
|
osd_req->r_result, obj_req);
|
|
rbd_assert(osd_req == obj_req->osd_req);
|
|
|
|
obj_req->result = osd_req->r_result < 0 ? osd_req->r_result : 0;
|
|
if (!obj_req->result && !rbd_img_is_write(obj_req->img_request))
|
|
obj_req->xferred = osd_req->r_result;
|
|
else
|
|
/*
|
|
* Writes aren't allowed to return a data payload. In some
|
|
* guarded write cases (e.g. stat + zero on an empty object)
|
|
* a stat response makes it through, but we don't care.
|
|
*/
|
|
obj_req->xferred = 0;
|
|
|
|
rbd_obj_handle_request(obj_req);
|
|
}
|
|
|
|
static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct ceph_osd_request *osd_req = obj_request->osd_req;
|
|
|
|
osd_req->r_flags = CEPH_OSD_FLAG_READ;
|
|
osd_req->r_snapid = obj_request->img_request->snap_id;
|
|
}
|
|
|
|
static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request)
|
|
{
|
|
struct ceph_osd_request *osd_req = obj_request->osd_req;
|
|
|
|
osd_req->r_flags = CEPH_OSD_FLAG_WRITE;
|
|
ktime_get_real_ts(&osd_req->r_mtime);
|
|
osd_req->r_data_offset = obj_request->ex.oe_off;
|
|
}
|
|
|
|
static struct ceph_osd_request *
|
|
rbd_osd_req_create(struct rbd_obj_request *obj_req, unsigned int num_ops)
|
|
{
|
|
struct rbd_img_request *img_req = obj_req->img_request;
|
|
struct rbd_device *rbd_dev = img_req->rbd_dev;
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct ceph_osd_request *req;
|
|
const char *name_format = rbd_dev->image_format == 1 ?
|
|
RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT;
|
|
|
|
req = ceph_osdc_alloc_request(osdc,
|
|
(rbd_img_is_write(img_req) ? img_req->snapc : NULL),
|
|
num_ops, false, GFP_NOIO);
|
|
if (!req)
|
|
return NULL;
|
|
|
|
req->r_callback = rbd_osd_req_callback;
|
|
req->r_priv = obj_req;
|
|
|
|
req->r_base_oloc.pool = rbd_dev->layout.pool_id;
|
|
if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format,
|
|
rbd_dev->header.object_prefix, obj_req->ex.oe_objno))
|
|
goto err_req;
|
|
|
|
if (ceph_osdc_alloc_messages(req, GFP_NOIO))
|
|
goto err_req;
|
|
|
|
return req;
|
|
|
|
err_req:
|
|
ceph_osdc_put_request(req);
|
|
return NULL;
|
|
}
|
|
|
|
static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req)
|
|
{
|
|
ceph_osdc_put_request(osd_req);
|
|
}
|
|
|
|
static struct rbd_obj_request *rbd_obj_request_create(void)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
|
|
obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO);
|
|
if (!obj_request)
|
|
return NULL;
|
|
|
|
ceph_object_extent_init(&obj_request->ex);
|
|
kref_init(&obj_request->kref);
|
|
|
|
dout("%s %p\n", __func__, obj_request);
|
|
return obj_request;
|
|
}
|
|
|
|
static void rbd_obj_request_destroy(struct kref *kref)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
u32 i;
|
|
|
|
obj_request = container_of(kref, struct rbd_obj_request, kref);
|
|
|
|
dout("%s: obj %p\n", __func__, obj_request);
|
|
|
|
if (obj_request->osd_req)
|
|
rbd_osd_req_destroy(obj_request->osd_req);
|
|
|
|
switch (obj_request->img_request->data_type) {
|
|
case OBJ_REQUEST_NODATA:
|
|
case OBJ_REQUEST_BIO:
|
|
case OBJ_REQUEST_BVECS:
|
|
break; /* Nothing to do */
|
|
case OBJ_REQUEST_OWN_BVECS:
|
|
kfree(obj_request->bvec_pos.bvecs);
|
|
break;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
|
|
kfree(obj_request->img_extents);
|
|
if (obj_request->copyup_bvecs) {
|
|
for (i = 0; i < obj_request->copyup_bvec_count; i++) {
|
|
if (obj_request->copyup_bvecs[i].bv_page)
|
|
__free_page(obj_request->copyup_bvecs[i].bv_page);
|
|
}
|
|
kfree(obj_request->copyup_bvecs);
|
|
}
|
|
|
|
kmem_cache_free(rbd_obj_request_cache, obj_request);
|
|
}
|
|
|
|
/* It's OK to call this for a device with no parent */
|
|
|
|
static void rbd_spec_put(struct rbd_spec *spec);
|
|
static void rbd_dev_unparent(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev_remove_parent(rbd_dev);
|
|
rbd_spec_put(rbd_dev->parent_spec);
|
|
rbd_dev->parent_spec = NULL;
|
|
rbd_dev->parent_overlap = 0;
|
|
}
|
|
|
|
/*
|
|
* Parent image reference counting is used to determine when an
|
|
* image's parent fields can be safely torn down--after there are no
|
|
* more in-flight requests to the parent image. When the last
|
|
* reference is dropped, cleaning them up is safe.
|
|
*/
|
|
static void rbd_dev_parent_put(struct rbd_device *rbd_dev)
|
|
{
|
|
int counter;
|
|
|
|
if (!rbd_dev->parent_spec)
|
|
return;
|
|
|
|
counter = atomic_dec_return_safe(&rbd_dev->parent_ref);
|
|
if (counter > 0)
|
|
return;
|
|
|
|
/* Last reference; clean up parent data structures */
|
|
|
|
if (!counter)
|
|
rbd_dev_unparent(rbd_dev);
|
|
else
|
|
rbd_warn(rbd_dev, "parent reference underflow");
|
|
}
|
|
|
|
/*
|
|
* If an image has a non-zero parent overlap, get a reference to its
|
|
* parent.
|
|
*
|
|
* Returns true if the rbd device has a parent with a non-zero
|
|
* overlap and a reference for it was successfully taken, or
|
|
* false otherwise.
|
|
*/
|
|
static bool rbd_dev_parent_get(struct rbd_device *rbd_dev)
|
|
{
|
|
int counter = 0;
|
|
|
|
if (!rbd_dev->parent_spec)
|
|
return false;
|
|
|
|
down_read(&rbd_dev->header_rwsem);
|
|
if (rbd_dev->parent_overlap)
|
|
counter = atomic_inc_return_safe(&rbd_dev->parent_ref);
|
|
up_read(&rbd_dev->header_rwsem);
|
|
|
|
if (counter < 0)
|
|
rbd_warn(rbd_dev, "parent reference overflow");
|
|
|
|
return counter > 0;
|
|
}
|
|
|
|
/*
|
|
* Caller is responsible for filling in the list of object requests
|
|
* that comprises the image request, and the Linux request pointer
|
|
* (if there is one).
|
|
*/
|
|
static struct rbd_img_request *rbd_img_request_create(
|
|
struct rbd_device *rbd_dev,
|
|
enum obj_operation_type op_type,
|
|
struct ceph_snap_context *snapc)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
|
|
img_request = kmem_cache_zalloc(rbd_img_request_cache, GFP_NOIO);
|
|
if (!img_request)
|
|
return NULL;
|
|
|
|
img_request->rbd_dev = rbd_dev;
|
|
img_request->op_type = op_type;
|
|
if (!rbd_img_is_write(img_request))
|
|
img_request->snap_id = rbd_dev->spec->snap_id;
|
|
else
|
|
img_request->snapc = snapc;
|
|
|
|
if (rbd_dev_parent_get(rbd_dev))
|
|
img_request_layered_set(img_request);
|
|
|
|
spin_lock_init(&img_request->completion_lock);
|
|
INIT_LIST_HEAD(&img_request->object_extents);
|
|
kref_init(&img_request->kref);
|
|
|
|
dout("%s: rbd_dev %p %s -> img %p\n", __func__, rbd_dev,
|
|
obj_op_name(op_type), img_request);
|
|
return img_request;
|
|
}
|
|
|
|
static void rbd_img_request_destroy(struct kref *kref)
|
|
{
|
|
struct rbd_img_request *img_request;
|
|
struct rbd_obj_request *obj_request;
|
|
struct rbd_obj_request *next_obj_request;
|
|
|
|
img_request = container_of(kref, struct rbd_img_request, kref);
|
|
|
|
dout("%s: img %p\n", __func__, img_request);
|
|
|
|
for_each_obj_request_safe(img_request, obj_request, next_obj_request)
|
|
rbd_img_obj_request_del(img_request, obj_request);
|
|
rbd_assert(img_request->obj_request_count == 0);
|
|
|
|
if (img_request_layered_test(img_request)) {
|
|
img_request_layered_clear(img_request);
|
|
rbd_dev_parent_put(img_request->rbd_dev);
|
|
}
|
|
|
|
if (rbd_img_is_write(img_request))
|
|
ceph_put_snap_context(img_request->snapc);
|
|
|
|
kmem_cache_free(rbd_img_request_cache, img_request);
|
|
}
|
|
|
|
static void prune_extents(struct ceph_file_extent *img_extents,
|
|
u32 *num_img_extents, u64 overlap)
|
|
{
|
|
u32 cnt = *num_img_extents;
|
|
|
|
/* drop extents completely beyond the overlap */
|
|
while (cnt && img_extents[cnt - 1].fe_off >= overlap)
|
|
cnt--;
|
|
|
|
if (cnt) {
|
|
struct ceph_file_extent *ex = &img_extents[cnt - 1];
|
|
|
|
/* trim final overlapping extent */
|
|
if (ex->fe_off + ex->fe_len > overlap)
|
|
ex->fe_len = overlap - ex->fe_off;
|
|
}
|
|
|
|
*num_img_extents = cnt;
|
|
}
|
|
|
|
/*
|
|
* Determine the byte range(s) covered by either just the object extent
|
|
* or the entire object in the parent image.
|
|
*/
|
|
static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req,
|
|
bool entire)
|
|
{
|
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
|
|
int ret;
|
|
|
|
if (!rbd_dev->parent_overlap)
|
|
return 0;
|
|
|
|
ret = ceph_extent_to_file(&rbd_dev->layout, obj_req->ex.oe_objno,
|
|
entire ? 0 : obj_req->ex.oe_off,
|
|
entire ? rbd_dev->layout.object_size :
|
|
obj_req->ex.oe_len,
|
|
&obj_req->img_extents,
|
|
&obj_req->num_img_extents);
|
|
if (ret)
|
|
return ret;
|
|
|
|
prune_extents(obj_req->img_extents, &obj_req->num_img_extents,
|
|
rbd_dev->parent_overlap);
|
|
return 0;
|
|
}
|
|
|
|
static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which)
|
|
{
|
|
switch (obj_req->img_request->data_type) {
|
|
case OBJ_REQUEST_BIO:
|
|
osd_req_op_extent_osd_data_bio(obj_req->osd_req, which,
|
|
&obj_req->bio_pos,
|
|
obj_req->ex.oe_len);
|
|
break;
|
|
case OBJ_REQUEST_BVECS:
|
|
case OBJ_REQUEST_OWN_BVECS:
|
|
rbd_assert(obj_req->bvec_pos.iter.bi_size ==
|
|
obj_req->ex.oe_len);
|
|
rbd_assert(obj_req->bvec_idx == obj_req->bvec_count);
|
|
osd_req_op_extent_osd_data_bvec_pos(obj_req->osd_req, which,
|
|
&obj_req->bvec_pos);
|
|
break;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
}
|
|
|
|
static int rbd_obj_setup_read(struct rbd_obj_request *obj_req)
|
|
{
|
|
obj_req->osd_req = rbd_osd_req_create(obj_req, 1);
|
|
if (!obj_req->osd_req)
|
|
return -ENOMEM;
|
|
|
|
osd_req_op_extent_init(obj_req->osd_req, 0, CEPH_OSD_OP_READ,
|
|
obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0);
|
|
rbd_osd_req_setup_data(obj_req, 0);
|
|
|
|
rbd_osd_req_format_read(obj_req);
|
|
return 0;
|
|
}
|
|
|
|
static int __rbd_obj_setup_stat(struct rbd_obj_request *obj_req,
|
|
unsigned int which)
|
|
{
|
|
struct page **pages;
|
|
|
|
/*
|
|
* The response data for a STAT call consists of:
|
|
* le64 length;
|
|
* struct {
|
|
* le32 tv_sec;
|
|
* le32 tv_nsec;
|
|
* } mtime;
|
|
*/
|
|
pages = ceph_alloc_page_vector(1, GFP_NOIO);
|
|
if (IS_ERR(pages))
|
|
return PTR_ERR(pages);
|
|
|
|
osd_req_op_init(obj_req->osd_req, which, CEPH_OSD_OP_STAT, 0);
|
|
osd_req_op_raw_data_in_pages(obj_req->osd_req, which, pages,
|
|
8 + sizeof(struct ceph_timespec),
|
|
0, false, true);
|
|
return 0;
|
|
}
|
|
|
|
static void __rbd_obj_setup_write(struct rbd_obj_request *obj_req,
|
|
unsigned int which)
|
|
{
|
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
|
|
u16 opcode;
|
|
|
|
osd_req_op_alloc_hint_init(obj_req->osd_req, which++,
|
|
rbd_dev->layout.object_size,
|
|
rbd_dev->layout.object_size);
|
|
|
|
if (rbd_obj_is_entire(obj_req))
|
|
opcode = CEPH_OSD_OP_WRITEFULL;
|
|
else
|
|
opcode = CEPH_OSD_OP_WRITE;
|
|
|
|
osd_req_op_extent_init(obj_req->osd_req, which, opcode,
|
|
obj_req->ex.oe_off, obj_req->ex.oe_len, 0, 0);
|
|
rbd_osd_req_setup_data(obj_req, which++);
|
|
|
|
rbd_assert(which == obj_req->osd_req->r_num_ops);
|
|
rbd_osd_req_format_write(obj_req);
|
|
}
|
|
|
|
static int rbd_obj_setup_write(struct rbd_obj_request *obj_req)
|
|
{
|
|
unsigned int num_osd_ops, which = 0;
|
|
int ret;
|
|
|
|
/* reverse map the entire object onto the parent */
|
|
ret = rbd_obj_calc_img_extents(obj_req, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (obj_req->num_img_extents) {
|
|
obj_req->write_state = RBD_OBJ_WRITE_GUARD;
|
|
num_osd_ops = 3; /* stat + setallochint + write/writefull */
|
|
} else {
|
|
obj_req->write_state = RBD_OBJ_WRITE_FLAT;
|
|
num_osd_ops = 2; /* setallochint + write/writefull */
|
|
}
|
|
|
|
obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops);
|
|
if (!obj_req->osd_req)
|
|
return -ENOMEM;
|
|
|
|
if (obj_req->num_img_extents) {
|
|
ret = __rbd_obj_setup_stat(obj_req, which++);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
__rbd_obj_setup_write(obj_req, which);
|
|
return 0;
|
|
}
|
|
|
|
static void __rbd_obj_setup_discard(struct rbd_obj_request *obj_req,
|
|
unsigned int which)
|
|
{
|
|
u16 opcode;
|
|
|
|
if (rbd_obj_is_entire(obj_req)) {
|
|
if (obj_req->num_img_extents) {
|
|
osd_req_op_init(obj_req->osd_req, which++,
|
|
CEPH_OSD_OP_CREATE, 0);
|
|
opcode = CEPH_OSD_OP_TRUNCATE;
|
|
} else {
|
|
osd_req_op_init(obj_req->osd_req, which++,
|
|
CEPH_OSD_OP_DELETE, 0);
|
|
opcode = 0;
|
|
}
|
|
} else if (rbd_obj_is_tail(obj_req)) {
|
|
opcode = CEPH_OSD_OP_TRUNCATE;
|
|
} else {
|
|
opcode = CEPH_OSD_OP_ZERO;
|
|
}
|
|
|
|
if (opcode)
|
|
osd_req_op_extent_init(obj_req->osd_req, which++, opcode,
|
|
obj_req->ex.oe_off, obj_req->ex.oe_len,
|
|
0, 0);
|
|
|
|
rbd_assert(which == obj_req->osd_req->r_num_ops);
|
|
rbd_osd_req_format_write(obj_req);
|
|
}
|
|
|
|
static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req)
|
|
{
|
|
unsigned int num_osd_ops, which = 0;
|
|
int ret;
|
|
|
|
/* reverse map the entire object onto the parent */
|
|
ret = rbd_obj_calc_img_extents(obj_req, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (rbd_obj_is_entire(obj_req)) {
|
|
obj_req->write_state = RBD_OBJ_WRITE_FLAT;
|
|
if (obj_req->num_img_extents)
|
|
num_osd_ops = 2; /* create + truncate */
|
|
else
|
|
num_osd_ops = 1; /* delete */
|
|
} else {
|
|
if (obj_req->num_img_extents) {
|
|
obj_req->write_state = RBD_OBJ_WRITE_GUARD;
|
|
num_osd_ops = 2; /* stat + truncate/zero */
|
|
} else {
|
|
obj_req->write_state = RBD_OBJ_WRITE_FLAT;
|
|
num_osd_ops = 1; /* truncate/zero */
|
|
}
|
|
}
|
|
|
|
obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops);
|
|
if (!obj_req->osd_req)
|
|
return -ENOMEM;
|
|
|
|
if (!rbd_obj_is_entire(obj_req) && obj_req->num_img_extents) {
|
|
ret = __rbd_obj_setup_stat(obj_req, which++);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
__rbd_obj_setup_discard(obj_req, which);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* For each object request in @img_req, allocate an OSD request, add
|
|
* individual OSD ops and prepare them for submission. The number of
|
|
* OSD ops depends on op_type and the overlap point (if any).
|
|
*/
|
|
static int __rbd_img_fill_request(struct rbd_img_request *img_req)
|
|
{
|
|
struct rbd_obj_request *obj_req;
|
|
int ret;
|
|
|
|
for_each_obj_request(img_req, obj_req) {
|
|
switch (img_req->op_type) {
|
|
case OBJ_OP_READ:
|
|
ret = rbd_obj_setup_read(obj_req);
|
|
break;
|
|
case OBJ_OP_WRITE:
|
|
ret = rbd_obj_setup_write(obj_req);
|
|
break;
|
|
case OBJ_OP_DISCARD:
|
|
ret = rbd_obj_setup_discard(obj_req);
|
|
break;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
union rbd_img_fill_iter {
|
|
struct ceph_bio_iter bio_iter;
|
|
struct ceph_bvec_iter bvec_iter;
|
|
};
|
|
|
|
struct rbd_img_fill_ctx {
|
|
enum obj_request_type pos_type;
|
|
union rbd_img_fill_iter *pos;
|
|
union rbd_img_fill_iter iter;
|
|
ceph_object_extent_fn_t set_pos_fn;
|
|
ceph_object_extent_fn_t count_fn;
|
|
ceph_object_extent_fn_t copy_fn;
|
|
};
|
|
|
|
static struct ceph_object_extent *alloc_object_extent(void *arg)
|
|
{
|
|
struct rbd_img_request *img_req = arg;
|
|
struct rbd_obj_request *obj_req;
|
|
|
|
obj_req = rbd_obj_request_create();
|
|
if (!obj_req)
|
|
return NULL;
|
|
|
|
rbd_img_obj_request_add(img_req, obj_req);
|
|
return &obj_req->ex;
|
|
}
|
|
|
|
/*
|
|
* While su != os && sc == 1 is technically not fancy (it's the same
|
|
* layout as su == os && sc == 1), we can't use the nocopy path for it
|
|
* because ->set_pos_fn() should be called only once per object.
|
|
* ceph_file_to_extents() invokes action_fn once per stripe unit, so
|
|
* treat su != os && sc == 1 as fancy.
|
|
*/
|
|
static bool rbd_layout_is_fancy(struct ceph_file_layout *l)
|
|
{
|
|
return l->stripe_unit != l->object_size;
|
|
}
|
|
|
|
static int rbd_img_fill_request_nocopy(struct rbd_img_request *img_req,
|
|
struct ceph_file_extent *img_extents,
|
|
u32 num_img_extents,
|
|
struct rbd_img_fill_ctx *fctx)
|
|
{
|
|
u32 i;
|
|
int ret;
|
|
|
|
img_req->data_type = fctx->pos_type;
|
|
|
|
/*
|
|
* Create object requests and set each object request's starting
|
|
* position in the provided bio (list) or bio_vec array.
|
|
*/
|
|
fctx->iter = *fctx->pos;
|
|
for (i = 0; i < num_img_extents; i++) {
|
|
ret = ceph_file_to_extents(&img_req->rbd_dev->layout,
|
|
img_extents[i].fe_off,
|
|
img_extents[i].fe_len,
|
|
&img_req->object_extents,
|
|
alloc_object_extent, img_req,
|
|
fctx->set_pos_fn, &fctx->iter);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return __rbd_img_fill_request(img_req);
|
|
}
|
|
|
|
/*
|
|
* Map a list of image extents to a list of object extents, create the
|
|
* corresponding object requests (normally each to a different object,
|
|
* but not always) and add them to @img_req. For each object request,
|
|
* set up its data descriptor to point to the corresponding chunk(s) of
|
|
* @fctx->pos data buffer.
|
|
*
|
|
* Because ceph_file_to_extents() will merge adjacent object extents
|
|
* together, each object request's data descriptor may point to multiple
|
|
* different chunks of @fctx->pos data buffer.
|
|
*
|
|
* @fctx->pos data buffer is assumed to be large enough.
|
|
*/
|
|
static int rbd_img_fill_request(struct rbd_img_request *img_req,
|
|
struct ceph_file_extent *img_extents,
|
|
u32 num_img_extents,
|
|
struct rbd_img_fill_ctx *fctx)
|
|
{
|
|
struct rbd_device *rbd_dev = img_req->rbd_dev;
|
|
struct rbd_obj_request *obj_req;
|
|
u32 i;
|
|
int ret;
|
|
|
|
if (fctx->pos_type == OBJ_REQUEST_NODATA ||
|
|
!rbd_layout_is_fancy(&rbd_dev->layout))
|
|
return rbd_img_fill_request_nocopy(img_req, img_extents,
|
|
num_img_extents, fctx);
|
|
|
|
img_req->data_type = OBJ_REQUEST_OWN_BVECS;
|
|
|
|
/*
|
|
* Create object requests and determine ->bvec_count for each object
|
|
* request. Note that ->bvec_count sum over all object requests may
|
|
* be greater than the number of bio_vecs in the provided bio (list)
|
|
* or bio_vec array because when mapped, those bio_vecs can straddle
|
|
* stripe unit boundaries.
|
|
*/
|
|
fctx->iter = *fctx->pos;
|
|
for (i = 0; i < num_img_extents; i++) {
|
|
ret = ceph_file_to_extents(&rbd_dev->layout,
|
|
img_extents[i].fe_off,
|
|
img_extents[i].fe_len,
|
|
&img_req->object_extents,
|
|
alloc_object_extent, img_req,
|
|
fctx->count_fn, &fctx->iter);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
for_each_obj_request(img_req, obj_req) {
|
|
obj_req->bvec_pos.bvecs = kmalloc_array(obj_req->bvec_count,
|
|
sizeof(*obj_req->bvec_pos.bvecs),
|
|
GFP_NOIO);
|
|
if (!obj_req->bvec_pos.bvecs)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Fill in each object request's private bio_vec array, splitting and
|
|
* rearranging the provided bio_vecs in stripe unit chunks as needed.
|
|
*/
|
|
fctx->iter = *fctx->pos;
|
|
for (i = 0; i < num_img_extents; i++) {
|
|
ret = ceph_iterate_extents(&rbd_dev->layout,
|
|
img_extents[i].fe_off,
|
|
img_extents[i].fe_len,
|
|
&img_req->object_extents,
|
|
fctx->copy_fn, &fctx->iter);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return __rbd_img_fill_request(img_req);
|
|
}
|
|
|
|
static int rbd_img_fill_nodata(struct rbd_img_request *img_req,
|
|
u64 off, u64 len)
|
|
{
|
|
struct ceph_file_extent ex = { off, len };
|
|
union rbd_img_fill_iter dummy;
|
|
struct rbd_img_fill_ctx fctx = {
|
|
.pos_type = OBJ_REQUEST_NODATA,
|
|
.pos = &dummy,
|
|
};
|
|
|
|
return rbd_img_fill_request(img_req, &ex, 1, &fctx);
|
|
}
|
|
|
|
static void set_bio_pos(struct ceph_object_extent *ex, u32 bytes, void *arg)
|
|
{
|
|
struct rbd_obj_request *obj_req =
|
|
container_of(ex, struct rbd_obj_request, ex);
|
|
struct ceph_bio_iter *it = arg;
|
|
|
|
dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes);
|
|
obj_req->bio_pos = *it;
|
|
ceph_bio_iter_advance(it, bytes);
|
|
}
|
|
|
|
static void count_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg)
|
|
{
|
|
struct rbd_obj_request *obj_req =
|
|
container_of(ex, struct rbd_obj_request, ex);
|
|
struct ceph_bio_iter *it = arg;
|
|
|
|
dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes);
|
|
ceph_bio_iter_advance_step(it, bytes, ({
|
|
obj_req->bvec_count++;
|
|
}));
|
|
|
|
}
|
|
|
|
static void copy_bio_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg)
|
|
{
|
|
struct rbd_obj_request *obj_req =
|
|
container_of(ex, struct rbd_obj_request, ex);
|
|
struct ceph_bio_iter *it = arg;
|
|
|
|
dout("%s objno %llu bytes %u\n", __func__, ex->oe_objno, bytes);
|
|
ceph_bio_iter_advance_step(it, bytes, ({
|
|
obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv;
|
|
obj_req->bvec_pos.iter.bi_size += bv.bv_len;
|
|
}));
|
|
}
|
|
|
|
static int __rbd_img_fill_from_bio(struct rbd_img_request *img_req,
|
|
struct ceph_file_extent *img_extents,
|
|
u32 num_img_extents,
|
|
struct ceph_bio_iter *bio_pos)
|
|
{
|
|
struct rbd_img_fill_ctx fctx = {
|
|
.pos_type = OBJ_REQUEST_BIO,
|
|
.pos = (union rbd_img_fill_iter *)bio_pos,
|
|
.set_pos_fn = set_bio_pos,
|
|
.count_fn = count_bio_bvecs,
|
|
.copy_fn = copy_bio_bvecs,
|
|
};
|
|
|
|
return rbd_img_fill_request(img_req, img_extents, num_img_extents,
|
|
&fctx);
|
|
}
|
|
|
|
static int rbd_img_fill_from_bio(struct rbd_img_request *img_req,
|
|
u64 off, u64 len, struct bio *bio)
|
|
{
|
|
struct ceph_file_extent ex = { off, len };
|
|
struct ceph_bio_iter it = { .bio = bio, .iter = bio->bi_iter };
|
|
|
|
return __rbd_img_fill_from_bio(img_req, &ex, 1, &it);
|
|
}
|
|
|
|
static void set_bvec_pos(struct ceph_object_extent *ex, u32 bytes, void *arg)
|
|
{
|
|
struct rbd_obj_request *obj_req =
|
|
container_of(ex, struct rbd_obj_request, ex);
|
|
struct ceph_bvec_iter *it = arg;
|
|
|
|
obj_req->bvec_pos = *it;
|
|
ceph_bvec_iter_shorten(&obj_req->bvec_pos, bytes);
|
|
ceph_bvec_iter_advance(it, bytes);
|
|
}
|
|
|
|
static void count_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg)
|
|
{
|
|
struct rbd_obj_request *obj_req =
|
|
container_of(ex, struct rbd_obj_request, ex);
|
|
struct ceph_bvec_iter *it = arg;
|
|
|
|
ceph_bvec_iter_advance_step(it, bytes, ({
|
|
obj_req->bvec_count++;
|
|
}));
|
|
}
|
|
|
|
static void copy_bvecs(struct ceph_object_extent *ex, u32 bytes, void *arg)
|
|
{
|
|
struct rbd_obj_request *obj_req =
|
|
container_of(ex, struct rbd_obj_request, ex);
|
|
struct ceph_bvec_iter *it = arg;
|
|
|
|
ceph_bvec_iter_advance_step(it, bytes, ({
|
|
obj_req->bvec_pos.bvecs[obj_req->bvec_idx++] = bv;
|
|
obj_req->bvec_pos.iter.bi_size += bv.bv_len;
|
|
}));
|
|
}
|
|
|
|
static int __rbd_img_fill_from_bvecs(struct rbd_img_request *img_req,
|
|
struct ceph_file_extent *img_extents,
|
|
u32 num_img_extents,
|
|
struct ceph_bvec_iter *bvec_pos)
|
|
{
|
|
struct rbd_img_fill_ctx fctx = {
|
|
.pos_type = OBJ_REQUEST_BVECS,
|
|
.pos = (union rbd_img_fill_iter *)bvec_pos,
|
|
.set_pos_fn = set_bvec_pos,
|
|
.count_fn = count_bvecs,
|
|
.copy_fn = copy_bvecs,
|
|
};
|
|
|
|
return rbd_img_fill_request(img_req, img_extents, num_img_extents,
|
|
&fctx);
|
|
}
|
|
|
|
static int rbd_img_fill_from_bvecs(struct rbd_img_request *img_req,
|
|
struct ceph_file_extent *img_extents,
|
|
u32 num_img_extents,
|
|
struct bio_vec *bvecs)
|
|
{
|
|
struct ceph_bvec_iter it = {
|
|
.bvecs = bvecs,
|
|
.iter = { .bi_size = ceph_file_extents_bytes(img_extents,
|
|
num_img_extents) },
|
|
};
|
|
|
|
return __rbd_img_fill_from_bvecs(img_req, img_extents, num_img_extents,
|
|
&it);
|
|
}
|
|
|
|
static void rbd_img_request_submit(struct rbd_img_request *img_request)
|
|
{
|
|
struct rbd_obj_request *obj_request;
|
|
|
|
dout("%s: img %p\n", __func__, img_request);
|
|
|
|
rbd_img_request_get(img_request);
|
|
for_each_obj_request(img_request, obj_request)
|
|
rbd_obj_request_submit(obj_request);
|
|
|
|
rbd_img_request_put(img_request);
|
|
}
|
|
|
|
static int rbd_obj_read_from_parent(struct rbd_obj_request *obj_req)
|
|
{
|
|
struct rbd_img_request *img_req = obj_req->img_request;
|
|
struct rbd_img_request *child_img_req;
|
|
int ret;
|
|
|
|
child_img_req = rbd_img_request_create(img_req->rbd_dev->parent,
|
|
OBJ_OP_READ, NULL);
|
|
if (!child_img_req)
|
|
return -ENOMEM;
|
|
|
|
__set_bit(IMG_REQ_CHILD, &child_img_req->flags);
|
|
child_img_req->obj_request = obj_req;
|
|
|
|
if (!rbd_img_is_write(img_req)) {
|
|
switch (img_req->data_type) {
|
|
case OBJ_REQUEST_BIO:
|
|
ret = __rbd_img_fill_from_bio(child_img_req,
|
|
obj_req->img_extents,
|
|
obj_req->num_img_extents,
|
|
&obj_req->bio_pos);
|
|
break;
|
|
case OBJ_REQUEST_BVECS:
|
|
case OBJ_REQUEST_OWN_BVECS:
|
|
ret = __rbd_img_fill_from_bvecs(child_img_req,
|
|
obj_req->img_extents,
|
|
obj_req->num_img_extents,
|
|
&obj_req->bvec_pos);
|
|
break;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
} else {
|
|
ret = rbd_img_fill_from_bvecs(child_img_req,
|
|
obj_req->img_extents,
|
|
obj_req->num_img_extents,
|
|
obj_req->copyup_bvecs);
|
|
}
|
|
if (ret) {
|
|
rbd_img_request_put(child_img_req);
|
|
return ret;
|
|
}
|
|
|
|
rbd_img_request_submit(child_img_req);
|
|
return 0;
|
|
}
|
|
|
|
static bool rbd_obj_handle_read(struct rbd_obj_request *obj_req)
|
|
{
|
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
|
|
int ret;
|
|
|
|
if (obj_req->result == -ENOENT &&
|
|
rbd_dev->parent_overlap && !obj_req->tried_parent) {
|
|
/* reverse map this object extent onto the parent */
|
|
ret = rbd_obj_calc_img_extents(obj_req, false);
|
|
if (ret) {
|
|
obj_req->result = ret;
|
|
return true;
|
|
}
|
|
|
|
if (obj_req->num_img_extents) {
|
|
obj_req->tried_parent = true;
|
|
ret = rbd_obj_read_from_parent(obj_req);
|
|
if (ret) {
|
|
obj_req->result = ret;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* -ENOENT means a hole in the image -- zero-fill the entire
|
|
* length of the request. A short read also implies zero-fill
|
|
* to the end of the request. In both cases we update xferred
|
|
* count to indicate the whole request was satisfied.
|
|
*/
|
|
if (obj_req->result == -ENOENT ||
|
|
(!obj_req->result && obj_req->xferred < obj_req->ex.oe_len)) {
|
|
rbd_assert(!obj_req->xferred || !obj_req->result);
|
|
rbd_obj_zero_range(obj_req, obj_req->xferred,
|
|
obj_req->ex.oe_len - obj_req->xferred);
|
|
obj_req->result = 0;
|
|
obj_req->xferred = obj_req->ex.oe_len;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* copyup_bvecs pages are never highmem pages
|
|
*/
|
|
static bool is_zero_bvecs(struct bio_vec *bvecs, u32 bytes)
|
|
{
|
|
struct ceph_bvec_iter it = {
|
|
.bvecs = bvecs,
|
|
.iter = { .bi_size = bytes },
|
|
};
|
|
|
|
ceph_bvec_iter_advance_step(&it, bytes, ({
|
|
if (memchr_inv(page_address(bv.bv_page) + bv.bv_offset, 0,
|
|
bv.bv_len))
|
|
return false;
|
|
}));
|
|
return true;
|
|
}
|
|
|
|
static int rbd_obj_issue_copyup(struct rbd_obj_request *obj_req, u32 bytes)
|
|
{
|
|
unsigned int num_osd_ops = obj_req->osd_req->r_num_ops;
|
|
|
|
dout("%s obj_req %p bytes %u\n", __func__, obj_req, bytes);
|
|
rbd_assert(obj_req->osd_req->r_ops[0].op == CEPH_OSD_OP_STAT);
|
|
rbd_osd_req_destroy(obj_req->osd_req);
|
|
|
|
/*
|
|
* Create a copyup request with the same number of OSD ops as
|
|
* the original request. The original request was stat + op(s),
|
|
* the new copyup request will be copyup + the same op(s).
|
|
*/
|
|
obj_req->osd_req = rbd_osd_req_create(obj_req, num_osd_ops);
|
|
if (!obj_req->osd_req)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Only send non-zero copyup data to save some I/O and network
|
|
* bandwidth -- zero copyup data is equivalent to the object not
|
|
* existing.
|
|
*/
|
|
if (is_zero_bvecs(obj_req->copyup_bvecs, bytes)) {
|
|
dout("%s obj_req %p detected zeroes\n", __func__, obj_req);
|
|
bytes = 0;
|
|
}
|
|
|
|
osd_req_op_cls_init(obj_req->osd_req, 0, CEPH_OSD_OP_CALL, "rbd",
|
|
"copyup");
|
|
osd_req_op_cls_request_data_bvecs(obj_req->osd_req, 0,
|
|
obj_req->copyup_bvecs, bytes);
|
|
|
|
switch (obj_req->img_request->op_type) {
|
|
case OBJ_OP_WRITE:
|
|
__rbd_obj_setup_write(obj_req, 1);
|
|
break;
|
|
case OBJ_OP_DISCARD:
|
|
rbd_assert(!rbd_obj_is_entire(obj_req));
|
|
__rbd_obj_setup_discard(obj_req, 1);
|
|
break;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
|
|
rbd_obj_request_submit(obj_req);
|
|
return 0;
|
|
}
|
|
|
|
static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap)
|
|
{
|
|
u32 i;
|
|
|
|
rbd_assert(!obj_req->copyup_bvecs);
|
|
obj_req->copyup_bvec_count = calc_pages_for(0, obj_overlap);
|
|
obj_req->copyup_bvecs = kcalloc(obj_req->copyup_bvec_count,
|
|
sizeof(*obj_req->copyup_bvecs),
|
|
GFP_NOIO);
|
|
if (!obj_req->copyup_bvecs)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < obj_req->copyup_bvec_count; i++) {
|
|
unsigned int len = min(obj_overlap, (u64)PAGE_SIZE);
|
|
|
|
obj_req->copyup_bvecs[i].bv_page = alloc_page(GFP_NOIO);
|
|
if (!obj_req->copyup_bvecs[i].bv_page)
|
|
return -ENOMEM;
|
|
|
|
obj_req->copyup_bvecs[i].bv_offset = 0;
|
|
obj_req->copyup_bvecs[i].bv_len = len;
|
|
obj_overlap -= len;
|
|
}
|
|
|
|
rbd_assert(!obj_overlap);
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req)
|
|
{
|
|
struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
|
|
int ret;
|
|
|
|
rbd_assert(obj_req->num_img_extents);
|
|
prune_extents(obj_req->img_extents, &obj_req->num_img_extents,
|
|
rbd_dev->parent_overlap);
|
|
if (!obj_req->num_img_extents) {
|
|
/*
|
|
* The overlap has become 0 (most likely because the
|
|
* image has been flattened). Use rbd_obj_issue_copyup()
|
|
* to re-submit the original write request -- the copyup
|
|
* operation itself will be a no-op, since someone must
|
|
* have populated the child object while we weren't
|
|
* looking. Move to WRITE_FLAT state as we'll be done
|
|
* with the operation once the null copyup completes.
|
|
*/
|
|
obj_req->write_state = RBD_OBJ_WRITE_FLAT;
|
|
return rbd_obj_issue_copyup(obj_req, 0);
|
|
}
|
|
|
|
ret = setup_copyup_bvecs(obj_req, rbd_obj_img_extents_bytes(obj_req));
|
|
if (ret)
|
|
return ret;
|
|
|
|
obj_req->write_state = RBD_OBJ_WRITE_COPYUP;
|
|
return rbd_obj_read_from_parent(obj_req);
|
|
}
|
|
|
|
static bool rbd_obj_handle_write(struct rbd_obj_request *obj_req)
|
|
{
|
|
int ret;
|
|
|
|
again:
|
|
switch (obj_req->write_state) {
|
|
case RBD_OBJ_WRITE_GUARD:
|
|
rbd_assert(!obj_req->xferred);
|
|
if (obj_req->result == -ENOENT) {
|
|
/*
|
|
* The target object doesn't exist. Read the data for
|
|
* the entire target object up to the overlap point (if
|
|
* any) from the parent, so we can use it for a copyup.
|
|
*/
|
|
ret = rbd_obj_handle_write_guard(obj_req);
|
|
if (ret) {
|
|
obj_req->result = ret;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
/* fall through */
|
|
case RBD_OBJ_WRITE_FLAT:
|
|
if (!obj_req->result)
|
|
/*
|
|
* There is no such thing as a successful short
|
|
* write -- indicate the whole request was satisfied.
|
|
*/
|
|
obj_req->xferred = obj_req->ex.oe_len;
|
|
return true;
|
|
case RBD_OBJ_WRITE_COPYUP:
|
|
obj_req->write_state = RBD_OBJ_WRITE_GUARD;
|
|
if (obj_req->result)
|
|
goto again;
|
|
|
|
rbd_assert(obj_req->xferred);
|
|
ret = rbd_obj_issue_copyup(obj_req, obj_req->xferred);
|
|
if (ret) {
|
|
obj_req->result = ret;
|
|
return true;
|
|
}
|
|
return false;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns true if @obj_req is completed, or false otherwise.
|
|
*/
|
|
static bool __rbd_obj_handle_request(struct rbd_obj_request *obj_req)
|
|
{
|
|
switch (obj_req->img_request->op_type) {
|
|
case OBJ_OP_READ:
|
|
return rbd_obj_handle_read(obj_req);
|
|
case OBJ_OP_WRITE:
|
|
return rbd_obj_handle_write(obj_req);
|
|
case OBJ_OP_DISCARD:
|
|
if (rbd_obj_handle_write(obj_req)) {
|
|
/*
|
|
* Hide -ENOENT from delete/truncate/zero -- discarding
|
|
* a non-existent object is not a problem.
|
|
*/
|
|
if (obj_req->result == -ENOENT) {
|
|
obj_req->result = 0;
|
|
obj_req->xferred = obj_req->ex.oe_len;
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
default:
|
|
rbd_assert(0);
|
|
}
|
|
}
|
|
|
|
static void rbd_obj_end_request(struct rbd_obj_request *obj_req)
|
|
{
|
|
struct rbd_img_request *img_req = obj_req->img_request;
|
|
|
|
rbd_assert((!obj_req->result &&
|
|
obj_req->xferred == obj_req->ex.oe_len) ||
|
|
(obj_req->result < 0 && !obj_req->xferred));
|
|
if (!obj_req->result) {
|
|
img_req->xferred += obj_req->xferred;
|
|
return;
|
|
}
|
|
|
|
rbd_warn(img_req->rbd_dev,
|
|
"%s at objno %llu %llu~%llu result %d xferred %llu",
|
|
obj_op_name(img_req->op_type), obj_req->ex.oe_objno,
|
|
obj_req->ex.oe_off, obj_req->ex.oe_len, obj_req->result,
|
|
obj_req->xferred);
|
|
if (!img_req->result) {
|
|
img_req->result = obj_req->result;
|
|
img_req->xferred = 0;
|
|
}
|
|
}
|
|
|
|
static void rbd_img_end_child_request(struct rbd_img_request *img_req)
|
|
{
|
|
struct rbd_obj_request *obj_req = img_req->obj_request;
|
|
|
|
rbd_assert(test_bit(IMG_REQ_CHILD, &img_req->flags));
|
|
rbd_assert((!img_req->result &&
|
|
img_req->xferred == rbd_obj_img_extents_bytes(obj_req)) ||
|
|
(img_req->result < 0 && !img_req->xferred));
|
|
|
|
obj_req->result = img_req->result;
|
|
obj_req->xferred = img_req->xferred;
|
|
rbd_img_request_put(img_req);
|
|
}
|
|
|
|
static void rbd_img_end_request(struct rbd_img_request *img_req)
|
|
{
|
|
rbd_assert(!test_bit(IMG_REQ_CHILD, &img_req->flags));
|
|
rbd_assert((!img_req->result &&
|
|
img_req->xferred == blk_rq_bytes(img_req->rq)) ||
|
|
(img_req->result < 0 && !img_req->xferred));
|
|
|
|
blk_mq_end_request(img_req->rq,
|
|
errno_to_blk_status(img_req->result));
|
|
rbd_img_request_put(img_req);
|
|
}
|
|
|
|
static void rbd_obj_handle_request(struct rbd_obj_request *obj_req)
|
|
{
|
|
struct rbd_img_request *img_req;
|
|
|
|
again:
|
|
if (!__rbd_obj_handle_request(obj_req))
|
|
return;
|
|
|
|
img_req = obj_req->img_request;
|
|
spin_lock(&img_req->completion_lock);
|
|
rbd_obj_end_request(obj_req);
|
|
rbd_assert(img_req->pending_count);
|
|
if (--img_req->pending_count) {
|
|
spin_unlock(&img_req->completion_lock);
|
|
return;
|
|
}
|
|
|
|
spin_unlock(&img_req->completion_lock);
|
|
if (test_bit(IMG_REQ_CHILD, &img_req->flags)) {
|
|
obj_req = img_req->obj_request;
|
|
rbd_img_end_child_request(img_req);
|
|
goto again;
|
|
}
|
|
rbd_img_end_request(img_req);
|
|
}
|
|
|
|
static const struct rbd_client_id rbd_empty_cid;
|
|
|
|
static bool rbd_cid_equal(const struct rbd_client_id *lhs,
|
|
const struct rbd_client_id *rhs)
|
|
{
|
|
return lhs->gid == rhs->gid && lhs->handle == rhs->handle;
|
|
}
|
|
|
|
static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_client_id cid;
|
|
|
|
mutex_lock(&rbd_dev->watch_mutex);
|
|
cid.gid = ceph_client_gid(rbd_dev->rbd_client->client);
|
|
cid.handle = rbd_dev->watch_cookie;
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
return cid;
|
|
}
|
|
|
|
/*
|
|
* lock_rwsem must be held for write
|
|
*/
|
|
static void rbd_set_owner_cid(struct rbd_device *rbd_dev,
|
|
const struct rbd_client_id *cid)
|
|
{
|
|
dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev,
|
|
rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle,
|
|
cid->gid, cid->handle);
|
|
rbd_dev->owner_cid = *cid; /* struct */
|
|
}
|
|
|
|
static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf)
|
|
{
|
|
mutex_lock(&rbd_dev->watch_mutex);
|
|
sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie);
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
}
|
|
|
|
static void __rbd_lock(struct rbd_device *rbd_dev, const char *cookie)
|
|
{
|
|
struct rbd_client_id cid = rbd_get_cid(rbd_dev);
|
|
|
|
strcpy(rbd_dev->lock_cookie, cookie);
|
|
rbd_set_owner_cid(rbd_dev, &cid);
|
|
queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work);
|
|
}
|
|
|
|
/*
|
|
* lock_rwsem must be held for write
|
|
*/
|
|
static int rbd_lock(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
char cookie[32];
|
|
int ret;
|
|
|
|
WARN_ON(__rbd_is_lock_owner(rbd_dev) ||
|
|
rbd_dev->lock_cookie[0] != '\0');
|
|
|
|
format_lock_cookie(rbd_dev, cookie);
|
|
ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
|
|
RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie,
|
|
RBD_LOCK_TAG, "", 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED;
|
|
__rbd_lock(rbd_dev, cookie);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* lock_rwsem must be held for write
|
|
*/
|
|
static void rbd_unlock(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
int ret;
|
|
|
|
WARN_ON(!__rbd_is_lock_owner(rbd_dev) ||
|
|
rbd_dev->lock_cookie[0] == '\0');
|
|
|
|
ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
|
|
RBD_LOCK_NAME, rbd_dev->lock_cookie);
|
|
if (ret && ret != -ENOENT)
|
|
rbd_warn(rbd_dev, "failed to unlock: %d", ret);
|
|
|
|
/* treat errors as the image is unlocked */
|
|
rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED;
|
|
rbd_dev->lock_cookie[0] = '\0';
|
|
rbd_set_owner_cid(rbd_dev, &rbd_empty_cid);
|
|
queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work);
|
|
}
|
|
|
|
static int __rbd_notify_op_lock(struct rbd_device *rbd_dev,
|
|
enum rbd_notify_op notify_op,
|
|
struct page ***preply_pages,
|
|
size_t *preply_len)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct rbd_client_id cid = rbd_get_cid(rbd_dev);
|
|
char buf[4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN];
|
|
int buf_size = sizeof(buf);
|
|
void *p = buf;
|
|
|
|
dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op);
|
|
|
|
/* encode *LockPayload NotifyMessage (op + ClientId) */
|
|
ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN);
|
|
ceph_encode_32(&p, notify_op);
|
|
ceph_encode_64(&p, cid.gid);
|
|
ceph_encode_64(&p, cid.handle);
|
|
|
|
return ceph_osdc_notify(osdc, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, buf, buf_size,
|
|
RBD_NOTIFY_TIMEOUT, preply_pages, preply_len);
|
|
}
|
|
|
|
static void rbd_notify_op_lock(struct rbd_device *rbd_dev,
|
|
enum rbd_notify_op notify_op)
|
|
{
|
|
struct page **reply_pages;
|
|
size_t reply_len;
|
|
|
|
__rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len);
|
|
ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len));
|
|
}
|
|
|
|
static void rbd_notify_acquired_lock(struct work_struct *work)
|
|
{
|
|
struct rbd_device *rbd_dev = container_of(work, struct rbd_device,
|
|
acquired_lock_work);
|
|
|
|
rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK);
|
|
}
|
|
|
|
static void rbd_notify_released_lock(struct work_struct *work)
|
|
{
|
|
struct rbd_device *rbd_dev = container_of(work, struct rbd_device,
|
|
released_lock_work);
|
|
|
|
rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK);
|
|
}
|
|
|
|
static int rbd_request_lock(struct rbd_device *rbd_dev)
|
|
{
|
|
struct page **reply_pages;
|
|
size_t reply_len;
|
|
bool lock_owner_responded = false;
|
|
int ret;
|
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
|
|
ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK,
|
|
&reply_pages, &reply_len);
|
|
if (ret && ret != -ETIMEDOUT) {
|
|
rbd_warn(rbd_dev, "failed to request lock: %d", ret);
|
|
goto out;
|
|
}
|
|
|
|
if (reply_len > 0 && reply_len <= PAGE_SIZE) {
|
|
void *p = page_address(reply_pages[0]);
|
|
void *const end = p + reply_len;
|
|
u32 n;
|
|
|
|
ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */
|
|
while (n--) {
|
|
u8 struct_v;
|
|
u32 len;
|
|
|
|
ceph_decode_need(&p, end, 8 + 8, e_inval);
|
|
p += 8 + 8; /* skip gid and cookie */
|
|
|
|
ceph_decode_32_safe(&p, end, len, e_inval);
|
|
if (!len)
|
|
continue;
|
|
|
|
if (lock_owner_responded) {
|
|
rbd_warn(rbd_dev,
|
|
"duplicate lock owners detected");
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
lock_owner_responded = true;
|
|
ret = ceph_start_decoding(&p, end, 1, "ResponseMessage",
|
|
&struct_v, &len);
|
|
if (ret) {
|
|
rbd_warn(rbd_dev,
|
|
"failed to decode ResponseMessage: %d",
|
|
ret);
|
|
goto e_inval;
|
|
}
|
|
|
|
ret = ceph_decode_32(&p);
|
|
}
|
|
}
|
|
|
|
if (!lock_owner_responded) {
|
|
rbd_warn(rbd_dev, "no lock owners detected");
|
|
ret = -ETIMEDOUT;
|
|
}
|
|
|
|
out:
|
|
ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len));
|
|
return ret;
|
|
|
|
e_inval:
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
static void wake_requests(struct rbd_device *rbd_dev, bool wake_all)
|
|
{
|
|
dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all);
|
|
|
|
cancel_delayed_work(&rbd_dev->lock_dwork);
|
|
if (wake_all)
|
|
wake_up_all(&rbd_dev->lock_waitq);
|
|
else
|
|
wake_up(&rbd_dev->lock_waitq);
|
|
}
|
|
|
|
static int get_lock_owner_info(struct rbd_device *rbd_dev,
|
|
struct ceph_locker **lockers, u32 *num_lockers)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
u8 lock_type;
|
|
char *lock_tag;
|
|
int ret;
|
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
|
|
ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, RBD_LOCK_NAME,
|
|
&lock_type, &lock_tag, lockers, num_lockers);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (*num_lockers == 0) {
|
|
dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev);
|
|
goto out;
|
|
}
|
|
|
|
if (strcmp(lock_tag, RBD_LOCK_TAG)) {
|
|
rbd_warn(rbd_dev, "locked by external mechanism, tag %s",
|
|
lock_tag);
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (lock_type == CEPH_CLS_LOCK_SHARED) {
|
|
rbd_warn(rbd_dev, "shared lock type detected");
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX,
|
|
strlen(RBD_LOCK_COOKIE_PREFIX))) {
|
|
rbd_warn(rbd_dev, "locked by external mechanism, cookie %s",
|
|
(*lockers)[0].id.cookie);
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
kfree(lock_tag);
|
|
return ret;
|
|
}
|
|
|
|
static int find_watcher(struct rbd_device *rbd_dev,
|
|
const struct ceph_locker *locker)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct ceph_watch_item *watchers;
|
|
u32 num_watchers;
|
|
u64 cookie;
|
|
int i;
|
|
int ret;
|
|
|
|
ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, &watchers,
|
|
&num_watchers);
|
|
if (ret)
|
|
return ret;
|
|
|
|
sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie);
|
|
for (i = 0; i < num_watchers; i++) {
|
|
if (!memcmp(&watchers[i].addr, &locker->info.addr,
|
|
sizeof(locker->info.addr)) &&
|
|
watchers[i].cookie == cookie) {
|
|
struct rbd_client_id cid = {
|
|
.gid = le64_to_cpu(watchers[i].name.num),
|
|
.handle = cookie,
|
|
};
|
|
|
|
dout("%s rbd_dev %p found cid %llu-%llu\n", __func__,
|
|
rbd_dev, cid.gid, cid.handle);
|
|
rbd_set_owner_cid(rbd_dev, &cid);
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev);
|
|
ret = 0;
|
|
out:
|
|
kfree(watchers);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* lock_rwsem must be held for write
|
|
*/
|
|
static int rbd_try_lock(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_client *client = rbd_dev->rbd_client->client;
|
|
struct ceph_locker *lockers;
|
|
u32 num_lockers;
|
|
int ret;
|
|
|
|
for (;;) {
|
|
ret = rbd_lock(rbd_dev);
|
|
if (ret != -EBUSY)
|
|
return ret;
|
|
|
|
/* determine if the current lock holder is still alive */
|
|
ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (num_lockers == 0)
|
|
goto again;
|
|
|
|
ret = find_watcher(rbd_dev, lockers);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = 0; /* have to request lock */
|
|
goto out;
|
|
}
|
|
|
|
rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock",
|
|
ENTITY_NAME(lockers[0].id.name));
|
|
|
|
ret = ceph_monc_blacklist_add(&client->monc,
|
|
&lockers[0].info.addr);
|
|
if (ret) {
|
|
rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d",
|
|
ENTITY_NAME(lockers[0].id.name), ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, RBD_LOCK_NAME,
|
|
lockers[0].id.cookie,
|
|
&lockers[0].id.name);
|
|
if (ret && ret != -ENOENT)
|
|
goto out;
|
|
|
|
again:
|
|
ceph_free_lockers(lockers, num_lockers);
|
|
}
|
|
|
|
out:
|
|
ceph_free_lockers(lockers, num_lockers);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED
|
|
*/
|
|
static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev,
|
|
int *pret)
|
|
{
|
|
enum rbd_lock_state lock_state;
|
|
|
|
down_read(&rbd_dev->lock_rwsem);
|
|
dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev,
|
|
rbd_dev->lock_state);
|
|
if (__rbd_is_lock_owner(rbd_dev)) {
|
|
lock_state = rbd_dev->lock_state;
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
return lock_state;
|
|
}
|
|
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev,
|
|
rbd_dev->lock_state);
|
|
if (!__rbd_is_lock_owner(rbd_dev)) {
|
|
*pret = rbd_try_lock(rbd_dev);
|
|
if (*pret)
|
|
rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret);
|
|
}
|
|
|
|
lock_state = rbd_dev->lock_state;
|
|
up_write(&rbd_dev->lock_rwsem);
|
|
return lock_state;
|
|
}
|
|
|
|
static void rbd_acquire_lock(struct work_struct *work)
|
|
{
|
|
struct rbd_device *rbd_dev = container_of(to_delayed_work(work),
|
|
struct rbd_device, lock_dwork);
|
|
enum rbd_lock_state lock_state;
|
|
int ret = 0;
|
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
again:
|
|
lock_state = rbd_try_acquire_lock(rbd_dev, &ret);
|
|
if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) {
|
|
if (lock_state == RBD_LOCK_STATE_LOCKED)
|
|
wake_requests(rbd_dev, true);
|
|
dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__,
|
|
rbd_dev, lock_state, ret);
|
|
return;
|
|
}
|
|
|
|
ret = rbd_request_lock(rbd_dev);
|
|
if (ret == -ETIMEDOUT) {
|
|
goto again; /* treat this as a dead client */
|
|
} else if (ret == -EROFS) {
|
|
rbd_warn(rbd_dev, "peer will not release lock");
|
|
/*
|
|
* If this is rbd_add_acquire_lock(), we want to fail
|
|
* immediately -- reuse BLACKLISTED flag. Otherwise we
|
|
* want to block.
|
|
*/
|
|
if (!(rbd_dev->disk->flags & GENHD_FL_UP)) {
|
|
set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags);
|
|
/* wake "rbd map --exclusive" process */
|
|
wake_requests(rbd_dev, false);
|
|
}
|
|
} else if (ret < 0) {
|
|
rbd_warn(rbd_dev, "error requesting lock: %d", ret);
|
|
mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork,
|
|
RBD_RETRY_DELAY);
|
|
} else {
|
|
/*
|
|
* lock owner acked, but resend if we don't see them
|
|
* release the lock
|
|
*/
|
|
dout("%s rbd_dev %p requeueing lock_dwork\n", __func__,
|
|
rbd_dev);
|
|
mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork,
|
|
msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* lock_rwsem must be held for write
|
|
*/
|
|
static bool rbd_release_lock(struct rbd_device *rbd_dev)
|
|
{
|
|
dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev,
|
|
rbd_dev->lock_state);
|
|
if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED)
|
|
return false;
|
|
|
|
rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING;
|
|
downgrade_write(&rbd_dev->lock_rwsem);
|
|
/*
|
|
* Ensure that all in-flight IO is flushed.
|
|
*
|
|
* FIXME: ceph_osdc_sync() flushes the entire OSD client, which
|
|
* may be shared with other devices.
|
|
*/
|
|
ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc);
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev,
|
|
rbd_dev->lock_state);
|
|
if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING)
|
|
return false;
|
|
|
|
rbd_unlock(rbd_dev);
|
|
/*
|
|
* Give others a chance to grab the lock - we would re-acquire
|
|
* almost immediately if we got new IO during ceph_osdc_sync()
|
|
* otherwise. We need to ack our own notifications, so this
|
|
* lock_dwork will be requeued from rbd_wait_state_locked()
|
|
* after wake_requests() in rbd_handle_released_lock().
|
|
*/
|
|
cancel_delayed_work(&rbd_dev->lock_dwork);
|
|
return true;
|
|
}
|
|
|
|
static void rbd_release_lock_work(struct work_struct *work)
|
|
{
|
|
struct rbd_device *rbd_dev = container_of(work, struct rbd_device,
|
|
unlock_work);
|
|
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
rbd_release_lock(rbd_dev);
|
|
up_write(&rbd_dev->lock_rwsem);
|
|
}
|
|
|
|
static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v,
|
|
void **p)
|
|
{
|
|
struct rbd_client_id cid = { 0 };
|
|
|
|
if (struct_v >= 2) {
|
|
cid.gid = ceph_decode_64(p);
|
|
cid.handle = ceph_decode_64(p);
|
|
}
|
|
|
|
dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid,
|
|
cid.handle);
|
|
if (!rbd_cid_equal(&cid, &rbd_empty_cid)) {
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) {
|
|
/*
|
|
* we already know that the remote client is
|
|
* the owner
|
|
*/
|
|
up_write(&rbd_dev->lock_rwsem);
|
|
return;
|
|
}
|
|
|
|
rbd_set_owner_cid(rbd_dev, &cid);
|
|
downgrade_write(&rbd_dev->lock_rwsem);
|
|
} else {
|
|
down_read(&rbd_dev->lock_rwsem);
|
|
}
|
|
|
|
if (!__rbd_is_lock_owner(rbd_dev))
|
|
wake_requests(rbd_dev, false);
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
}
|
|
|
|
static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v,
|
|
void **p)
|
|
{
|
|
struct rbd_client_id cid = { 0 };
|
|
|
|
if (struct_v >= 2) {
|
|
cid.gid = ceph_decode_64(p);
|
|
cid.handle = ceph_decode_64(p);
|
|
}
|
|
|
|
dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid,
|
|
cid.handle);
|
|
if (!rbd_cid_equal(&cid, &rbd_empty_cid)) {
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) {
|
|
dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n",
|
|
__func__, rbd_dev, cid.gid, cid.handle,
|
|
rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle);
|
|
up_write(&rbd_dev->lock_rwsem);
|
|
return;
|
|
}
|
|
|
|
rbd_set_owner_cid(rbd_dev, &rbd_empty_cid);
|
|
downgrade_write(&rbd_dev->lock_rwsem);
|
|
} else {
|
|
down_read(&rbd_dev->lock_rwsem);
|
|
}
|
|
|
|
if (!__rbd_is_lock_owner(rbd_dev))
|
|
wake_requests(rbd_dev, false);
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
}
|
|
|
|
/*
|
|
* Returns result for ResponseMessage to be encoded (<= 0), or 1 if no
|
|
* ResponseMessage is needed.
|
|
*/
|
|
static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v,
|
|
void **p)
|
|
{
|
|
struct rbd_client_id my_cid = rbd_get_cid(rbd_dev);
|
|
struct rbd_client_id cid = { 0 };
|
|
int result = 1;
|
|
|
|
if (struct_v >= 2) {
|
|
cid.gid = ceph_decode_64(p);
|
|
cid.handle = ceph_decode_64(p);
|
|
}
|
|
|
|
dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid,
|
|
cid.handle);
|
|
if (rbd_cid_equal(&cid, &my_cid))
|
|
return result;
|
|
|
|
down_read(&rbd_dev->lock_rwsem);
|
|
if (__rbd_is_lock_owner(rbd_dev)) {
|
|
if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED &&
|
|
rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* encode ResponseMessage(0) so the peer can detect
|
|
* a missing owner
|
|
*/
|
|
result = 0;
|
|
|
|
if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) {
|
|
if (!rbd_dev->opts->exclusive) {
|
|
dout("%s rbd_dev %p queueing unlock_work\n",
|
|
__func__, rbd_dev);
|
|
queue_work(rbd_dev->task_wq,
|
|
&rbd_dev->unlock_work);
|
|
} else {
|
|
/* refuse to release the lock */
|
|
result = -EROFS;
|
|
}
|
|
}
|
|
}
|
|
|
|
out_unlock:
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
return result;
|
|
}
|
|
|
|
static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev,
|
|
u64 notify_id, u64 cookie, s32 *result)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
char buf[4 + CEPH_ENCODING_START_BLK_LEN];
|
|
int buf_size = sizeof(buf);
|
|
int ret;
|
|
|
|
if (result) {
|
|
void *p = buf;
|
|
|
|
/* encode ResponseMessage */
|
|
ceph_start_encoding(&p, 1, 1,
|
|
buf_size - CEPH_ENCODING_START_BLK_LEN);
|
|
ceph_encode_32(&p, *result);
|
|
} else {
|
|
buf_size = 0;
|
|
}
|
|
|
|
ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, notify_id, cookie,
|
|
buf, buf_size);
|
|
if (ret)
|
|
rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret);
|
|
}
|
|
|
|
static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id,
|
|
u64 cookie)
|
|
{
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
__rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL);
|
|
}
|
|
|
|
static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev,
|
|
u64 notify_id, u64 cookie, s32 result)
|
|
{
|
|
dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result);
|
|
__rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result);
|
|
}
|
|
|
|
static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie,
|
|
u64 notifier_id, void *data, size_t data_len)
|
|
{
|
|
struct rbd_device *rbd_dev = arg;
|
|
void *p = data;
|
|
void *const end = p + data_len;
|
|
u8 struct_v = 0;
|
|
u32 len;
|
|
u32 notify_op;
|
|
int ret;
|
|
|
|
dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n",
|
|
__func__, rbd_dev, cookie, notify_id, data_len);
|
|
if (data_len) {
|
|
ret = ceph_start_decoding(&p, end, 1, "NotifyMessage",
|
|
&struct_v, &len);
|
|
if (ret) {
|
|
rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d",
|
|
ret);
|
|
return;
|
|
}
|
|
|
|
notify_op = ceph_decode_32(&p);
|
|
} else {
|
|
/* legacy notification for header updates */
|
|
notify_op = RBD_NOTIFY_OP_HEADER_UPDATE;
|
|
len = 0;
|
|
}
|
|
|
|
dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op);
|
|
switch (notify_op) {
|
|
case RBD_NOTIFY_OP_ACQUIRED_LOCK:
|
|
rbd_handle_acquired_lock(rbd_dev, struct_v, &p);
|
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
|
|
break;
|
|
case RBD_NOTIFY_OP_RELEASED_LOCK:
|
|
rbd_handle_released_lock(rbd_dev, struct_v, &p);
|
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
|
|
break;
|
|
case RBD_NOTIFY_OP_REQUEST_LOCK:
|
|
ret = rbd_handle_request_lock(rbd_dev, struct_v, &p);
|
|
if (ret <= 0)
|
|
rbd_acknowledge_notify_result(rbd_dev, notify_id,
|
|
cookie, ret);
|
|
else
|
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
|
|
break;
|
|
case RBD_NOTIFY_OP_HEADER_UPDATE:
|
|
ret = rbd_dev_refresh(rbd_dev);
|
|
if (ret)
|
|
rbd_warn(rbd_dev, "refresh failed: %d", ret);
|
|
|
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
|
|
break;
|
|
default:
|
|
if (rbd_is_lock_owner(rbd_dev))
|
|
rbd_acknowledge_notify_result(rbd_dev, notify_id,
|
|
cookie, -EOPNOTSUPP);
|
|
else
|
|
rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void __rbd_unregister_watch(struct rbd_device *rbd_dev);
|
|
|
|
static void rbd_watch_errcb(void *arg, u64 cookie, int err)
|
|
{
|
|
struct rbd_device *rbd_dev = arg;
|
|
|
|
rbd_warn(rbd_dev, "encountered watch error: %d", err);
|
|
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
rbd_set_owner_cid(rbd_dev, &rbd_empty_cid);
|
|
up_write(&rbd_dev->lock_rwsem);
|
|
|
|
mutex_lock(&rbd_dev->watch_mutex);
|
|
if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) {
|
|
__rbd_unregister_watch(rbd_dev);
|
|
rbd_dev->watch_state = RBD_WATCH_STATE_ERROR;
|
|
|
|
queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0);
|
|
}
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
}
|
|
|
|
/*
|
|
* watch_mutex must be locked
|
|
*/
|
|
static int __rbd_register_watch(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct ceph_osd_linger_request *handle;
|
|
|
|
rbd_assert(!rbd_dev->watch_handle);
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
|
|
handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, rbd_watch_cb,
|
|
rbd_watch_errcb, rbd_dev);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
rbd_dev->watch_handle = handle;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* watch_mutex must be locked
|
|
*/
|
|
static void __rbd_unregister_watch(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
int ret;
|
|
|
|
rbd_assert(rbd_dev->watch_handle);
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
|
|
ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle);
|
|
if (ret)
|
|
rbd_warn(rbd_dev, "failed to unwatch: %d", ret);
|
|
|
|
rbd_dev->watch_handle = NULL;
|
|
}
|
|
|
|
static int rbd_register_watch(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&rbd_dev->watch_mutex);
|
|
rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED);
|
|
ret = __rbd_register_watch(rbd_dev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED;
|
|
rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id;
|
|
|
|
out:
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void cancel_tasks_sync(struct rbd_device *rbd_dev)
|
|
{
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
|
|
cancel_delayed_work_sync(&rbd_dev->watch_dwork);
|
|
cancel_work_sync(&rbd_dev->acquired_lock_work);
|
|
cancel_work_sync(&rbd_dev->released_lock_work);
|
|
cancel_delayed_work_sync(&rbd_dev->lock_dwork);
|
|
cancel_work_sync(&rbd_dev->unlock_work);
|
|
}
|
|
|
|
static void rbd_unregister_watch(struct rbd_device *rbd_dev)
|
|
{
|
|
WARN_ON(waitqueue_active(&rbd_dev->lock_waitq));
|
|
cancel_tasks_sync(rbd_dev);
|
|
|
|
mutex_lock(&rbd_dev->watch_mutex);
|
|
if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED)
|
|
__rbd_unregister_watch(rbd_dev);
|
|
rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED;
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
|
|
ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc);
|
|
}
|
|
|
|
/*
|
|
* lock_rwsem must be held for write
|
|
*/
|
|
static void rbd_reacquire_lock(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
char cookie[32];
|
|
int ret;
|
|
|
|
WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED);
|
|
|
|
format_lock_cookie(rbd_dev, cookie);
|
|
ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, RBD_LOCK_NAME,
|
|
CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie,
|
|
RBD_LOCK_TAG, cookie);
|
|
if (ret) {
|
|
if (ret != -EOPNOTSUPP)
|
|
rbd_warn(rbd_dev, "failed to update lock cookie: %d",
|
|
ret);
|
|
|
|
/*
|
|
* Lock cookie cannot be updated on older OSDs, so do
|
|
* a manual release and queue an acquire.
|
|
*/
|
|
if (rbd_release_lock(rbd_dev))
|
|
queue_delayed_work(rbd_dev->task_wq,
|
|
&rbd_dev->lock_dwork, 0);
|
|
} else {
|
|
__rbd_lock(rbd_dev, cookie);
|
|
}
|
|
}
|
|
|
|
static void rbd_reregister_watch(struct work_struct *work)
|
|
{
|
|
struct rbd_device *rbd_dev = container_of(to_delayed_work(work),
|
|
struct rbd_device, watch_dwork);
|
|
int ret;
|
|
|
|
dout("%s rbd_dev %p\n", __func__, rbd_dev);
|
|
|
|
mutex_lock(&rbd_dev->watch_mutex);
|
|
if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) {
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
return;
|
|
}
|
|
|
|
ret = __rbd_register_watch(rbd_dev);
|
|
if (ret) {
|
|
rbd_warn(rbd_dev, "failed to reregister watch: %d", ret);
|
|
if (ret == -EBLACKLISTED || ret == -ENOENT) {
|
|
set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags);
|
|
wake_requests(rbd_dev, true);
|
|
} else {
|
|
queue_delayed_work(rbd_dev->task_wq,
|
|
&rbd_dev->watch_dwork,
|
|
RBD_RETRY_DELAY);
|
|
}
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
return;
|
|
}
|
|
|
|
rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED;
|
|
rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id;
|
|
mutex_unlock(&rbd_dev->watch_mutex);
|
|
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED)
|
|
rbd_reacquire_lock(rbd_dev);
|
|
up_write(&rbd_dev->lock_rwsem);
|
|
|
|
ret = rbd_dev_refresh(rbd_dev);
|
|
if (ret)
|
|
rbd_warn(rbd_dev, "reregistration refresh failed: %d", ret);
|
|
}
|
|
|
|
/*
|
|
* Synchronous osd object method call. Returns the number of bytes
|
|
* returned in the outbound buffer, or a negative error code.
|
|
*/
|
|
static int rbd_obj_method_sync(struct rbd_device *rbd_dev,
|
|
struct ceph_object_id *oid,
|
|
struct ceph_object_locator *oloc,
|
|
const char *method_name,
|
|
const void *outbound,
|
|
size_t outbound_size,
|
|
void *inbound,
|
|
size_t inbound_size)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct page *req_page = NULL;
|
|
struct page *reply_page;
|
|
int ret;
|
|
|
|
/*
|
|
* Method calls are ultimately read operations. The result
|
|
* should placed into the inbound buffer provided. They
|
|
* also supply outbound data--parameters for the object
|
|
* method. Currently if this is present it will be a
|
|
* snapshot id.
|
|
*/
|
|
if (outbound) {
|
|
if (outbound_size > PAGE_SIZE)
|
|
return -E2BIG;
|
|
|
|
req_page = alloc_page(GFP_KERNEL);
|
|
if (!req_page)
|
|
return -ENOMEM;
|
|
|
|
memcpy(page_address(req_page), outbound, outbound_size);
|
|
}
|
|
|
|
reply_page = alloc_page(GFP_KERNEL);
|
|
if (!reply_page) {
|
|
if (req_page)
|
|
__free_page(req_page);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name,
|
|
CEPH_OSD_FLAG_READ, req_page, outbound_size,
|
|
reply_page, &inbound_size);
|
|
if (!ret) {
|
|
memcpy(inbound, page_address(reply_page), inbound_size);
|
|
ret = inbound_size;
|
|
}
|
|
|
|
if (req_page)
|
|
__free_page(req_page);
|
|
__free_page(reply_page);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* lock_rwsem must be held for read
|
|
*/
|
|
static void rbd_wait_state_locked(struct rbd_device *rbd_dev)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
do {
|
|
/*
|
|
* Note the use of mod_delayed_work() in rbd_acquire_lock()
|
|
* and cancel_delayed_work() in wake_requests().
|
|
*/
|
|
dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev);
|
|
queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0);
|
|
prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
schedule();
|
|
down_read(&rbd_dev->lock_rwsem);
|
|
} while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED &&
|
|
!test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags));
|
|
|
|
finish_wait(&rbd_dev->lock_waitq, &wait);
|
|
}
|
|
|
|
static void rbd_queue_workfn(struct work_struct *work)
|
|
{
|
|
struct request *rq = blk_mq_rq_from_pdu(work);
|
|
struct rbd_device *rbd_dev = rq->q->queuedata;
|
|
struct rbd_img_request *img_request;
|
|
struct ceph_snap_context *snapc = NULL;
|
|
u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT;
|
|
u64 length = blk_rq_bytes(rq);
|
|
enum obj_operation_type op_type;
|
|
u64 mapping_size;
|
|
bool must_be_locked;
|
|
int result;
|
|
|
|
switch (req_op(rq)) {
|
|
case REQ_OP_DISCARD:
|
|
case REQ_OP_WRITE_ZEROES:
|
|
op_type = OBJ_OP_DISCARD;
|
|
break;
|
|
case REQ_OP_WRITE:
|
|
op_type = OBJ_OP_WRITE;
|
|
break;
|
|
case REQ_OP_READ:
|
|
op_type = OBJ_OP_READ;
|
|
break;
|
|
default:
|
|
dout("%s: non-fs request type %d\n", __func__, req_op(rq));
|
|
result = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
/* Ignore/skip any zero-length requests */
|
|
|
|
if (!length) {
|
|
dout("%s: zero-length request\n", __func__);
|
|
result = 0;
|
|
goto err_rq;
|
|
}
|
|
|
|
rbd_assert(op_type == OBJ_OP_READ ||
|
|
rbd_dev->spec->snap_id == CEPH_NOSNAP);
|
|
|
|
/*
|
|
* Quit early if the mapped snapshot no longer exists. It's
|
|
* still possible the snapshot will have disappeared by the
|
|
* time our request arrives at the osd, but there's no sense in
|
|
* sending it if we already know.
|
|
*/
|
|
if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) {
|
|
dout("request for non-existent snapshot");
|
|
rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
|
|
result = -ENXIO;
|
|
goto err_rq;
|
|
}
|
|
|
|
if (offset && length > U64_MAX - offset + 1) {
|
|
rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset,
|
|
length);
|
|
result = -EINVAL;
|
|
goto err_rq; /* Shouldn't happen */
|
|
}
|
|
|
|
blk_mq_start_request(rq);
|
|
|
|
down_read(&rbd_dev->header_rwsem);
|
|
mapping_size = rbd_dev->mapping.size;
|
|
if (op_type != OBJ_OP_READ) {
|
|
snapc = rbd_dev->header.snapc;
|
|
ceph_get_snap_context(snapc);
|
|
}
|
|
up_read(&rbd_dev->header_rwsem);
|
|
|
|
if (offset + length > mapping_size) {
|
|
rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset,
|
|
length, mapping_size);
|
|
result = -EIO;
|
|
goto err_rq;
|
|
}
|
|
|
|
must_be_locked =
|
|
(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) &&
|
|
(op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read);
|
|
if (must_be_locked) {
|
|
down_read(&rbd_dev->lock_rwsem);
|
|
if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED &&
|
|
!test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) {
|
|
if (rbd_dev->opts->exclusive) {
|
|
rbd_warn(rbd_dev, "exclusive lock required");
|
|
result = -EROFS;
|
|
goto err_unlock;
|
|
}
|
|
rbd_wait_state_locked(rbd_dev);
|
|
}
|
|
if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) {
|
|
result = -EBLACKLISTED;
|
|
goto err_unlock;
|
|
}
|
|
}
|
|
|
|
img_request = rbd_img_request_create(rbd_dev, op_type, snapc);
|
|
if (!img_request) {
|
|
result = -ENOMEM;
|
|
goto err_unlock;
|
|
}
|
|
img_request->rq = rq;
|
|
snapc = NULL; /* img_request consumes a ref */
|
|
|
|
if (op_type == OBJ_OP_DISCARD)
|
|
result = rbd_img_fill_nodata(img_request, offset, length);
|
|
else
|
|
result = rbd_img_fill_from_bio(img_request, offset, length,
|
|
rq->bio);
|
|
if (result)
|
|
goto err_img_request;
|
|
|
|
rbd_img_request_submit(img_request);
|
|
if (must_be_locked)
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
return;
|
|
|
|
err_img_request:
|
|
rbd_img_request_put(img_request);
|
|
err_unlock:
|
|
if (must_be_locked)
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
err_rq:
|
|
if (result)
|
|
rbd_warn(rbd_dev, "%s %llx at %llx result %d",
|
|
obj_op_name(op_type), length, offset, result);
|
|
ceph_put_snap_context(snapc);
|
|
err:
|
|
blk_mq_end_request(rq, errno_to_blk_status(result));
|
|
}
|
|
|
|
static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx,
|
|
const struct blk_mq_queue_data *bd)
|
|
{
|
|
struct request *rq = bd->rq;
|
|
struct work_struct *work = blk_mq_rq_to_pdu(rq);
|
|
|
|
queue_work(rbd_wq, work);
|
|
return BLK_STS_OK;
|
|
}
|
|
|
|
static void rbd_free_disk(struct rbd_device *rbd_dev)
|
|
{
|
|
blk_cleanup_queue(rbd_dev->disk->queue);
|
|
blk_mq_free_tag_set(&rbd_dev->tag_set);
|
|
put_disk(rbd_dev->disk);
|
|
rbd_dev->disk = NULL;
|
|
}
|
|
|
|
static int rbd_obj_read_sync(struct rbd_device *rbd_dev,
|
|
struct ceph_object_id *oid,
|
|
struct ceph_object_locator *oloc,
|
|
void *buf, int buf_len)
|
|
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct ceph_osd_request *req;
|
|
struct page **pages;
|
|
int num_pages = calc_pages_for(0, buf_len);
|
|
int ret;
|
|
|
|
req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
|
|
ceph_oid_copy(&req->r_base_oid, oid);
|
|
ceph_oloc_copy(&req->r_base_oloc, oloc);
|
|
req->r_flags = CEPH_OSD_FLAG_READ;
|
|
|
|
ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
|
|
if (ret)
|
|
goto out_req;
|
|
|
|
pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
|
|
if (IS_ERR(pages)) {
|
|
ret = PTR_ERR(pages);
|
|
goto out_req;
|
|
}
|
|
|
|
osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0);
|
|
osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false,
|
|
true);
|
|
|
|
ceph_osdc_start_request(osdc, req, false);
|
|
ret = ceph_osdc_wait_request(osdc, req);
|
|
if (ret >= 0)
|
|
ceph_copy_from_page_vector(pages, buf, 0, ret);
|
|
|
|
out_req:
|
|
ceph_osdc_put_request(req);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read the complete header for the given rbd device. On successful
|
|
* return, the rbd_dev->header field will contain up-to-date
|
|
* information about the image.
|
|
*/
|
|
static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_image_header_ondisk *ondisk = NULL;
|
|
u32 snap_count = 0;
|
|
u64 names_size = 0;
|
|
u32 want_count;
|
|
int ret;
|
|
|
|
/*
|
|
* The complete header will include an array of its 64-bit
|
|
* snapshot ids, followed by the names of those snapshots as
|
|
* a contiguous block of NUL-terminated strings. Note that
|
|
* the number of snapshots could change by the time we read
|
|
* it in, in which case we re-read it.
|
|
*/
|
|
do {
|
|
size_t size;
|
|
|
|
kfree(ondisk);
|
|
|
|
size = sizeof (*ondisk);
|
|
size += snap_count * sizeof (struct rbd_image_snap_ondisk);
|
|
size += names_size;
|
|
ondisk = kmalloc(size, GFP_KERNEL);
|
|
if (!ondisk)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, ondisk, size);
|
|
if (ret < 0)
|
|
goto out;
|
|
if ((size_t)ret < size) {
|
|
ret = -ENXIO;
|
|
rbd_warn(rbd_dev, "short header read (want %zd got %d)",
|
|
size, ret);
|
|
goto out;
|
|
}
|
|
if (!rbd_dev_ondisk_valid(ondisk)) {
|
|
ret = -ENXIO;
|
|
rbd_warn(rbd_dev, "invalid header");
|
|
goto out;
|
|
}
|
|
|
|
names_size = le64_to_cpu(ondisk->snap_names_len);
|
|
want_count = snap_count;
|
|
snap_count = le32_to_cpu(ondisk->snap_count);
|
|
} while (snap_count != want_count);
|
|
|
|
ret = rbd_header_from_disk(rbd_dev, ondisk);
|
|
out:
|
|
kfree(ondisk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Clear the rbd device's EXISTS flag if the snapshot it's mapped to
|
|
* has disappeared from the (just updated) snapshot context.
|
|
*/
|
|
static void rbd_exists_validate(struct rbd_device *rbd_dev)
|
|
{
|
|
u64 snap_id;
|
|
|
|
if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags))
|
|
return;
|
|
|
|
snap_id = rbd_dev->spec->snap_id;
|
|
if (snap_id == CEPH_NOSNAP)
|
|
return;
|
|
|
|
if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX)
|
|
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
|
|
}
|
|
|
|
static void rbd_dev_update_size(struct rbd_device *rbd_dev)
|
|
{
|
|
sector_t size;
|
|
|
|
/*
|
|
* If EXISTS is not set, rbd_dev->disk may be NULL, so don't
|
|
* try to update its size. If REMOVING is set, updating size
|
|
* is just useless work since the device can't be opened.
|
|
*/
|
|
if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) &&
|
|
!test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) {
|
|
size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
|
|
dout("setting size to %llu sectors", (unsigned long long)size);
|
|
set_capacity(rbd_dev->disk, size);
|
|
revalidate_disk(rbd_dev->disk);
|
|
}
|
|
}
|
|
|
|
static int rbd_dev_refresh(struct rbd_device *rbd_dev)
|
|
{
|
|
u64 mapping_size;
|
|
int ret;
|
|
|
|
down_write(&rbd_dev->header_rwsem);
|
|
mapping_size = rbd_dev->mapping.size;
|
|
|
|
ret = rbd_dev_header_info(rbd_dev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* If there is a parent, see if it has disappeared due to the
|
|
* mapped image getting flattened.
|
|
*/
|
|
if (rbd_dev->parent) {
|
|
ret = rbd_dev_v2_parent_info(rbd_dev);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (rbd_dev->spec->snap_id == CEPH_NOSNAP) {
|
|
rbd_dev->mapping.size = rbd_dev->header.image_size;
|
|
} else {
|
|
/* validate mapped snapshot's EXISTS flag */
|
|
rbd_exists_validate(rbd_dev);
|
|
}
|
|
|
|
out:
|
|
up_write(&rbd_dev->header_rwsem);
|
|
if (!ret && mapping_size != rbd_dev->mapping.size)
|
|
rbd_dev_update_size(rbd_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq,
|
|
unsigned int hctx_idx, unsigned int numa_node)
|
|
{
|
|
struct work_struct *work = blk_mq_rq_to_pdu(rq);
|
|
|
|
INIT_WORK(work, rbd_queue_workfn);
|
|
return 0;
|
|
}
|
|
|
|
static const struct blk_mq_ops rbd_mq_ops = {
|
|
.queue_rq = rbd_queue_rq,
|
|
.init_request = rbd_init_request,
|
|
};
|
|
|
|
static int rbd_init_disk(struct rbd_device *rbd_dev)
|
|
{
|
|
struct gendisk *disk;
|
|
struct request_queue *q;
|
|
u64 segment_size;
|
|
int err;
|
|
|
|
/* create gendisk info */
|
|
disk = alloc_disk(single_major ?
|
|
(1 << RBD_SINGLE_MAJOR_PART_SHIFT) :
|
|
RBD_MINORS_PER_MAJOR);
|
|
if (!disk)
|
|
return -ENOMEM;
|
|
|
|
snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d",
|
|
rbd_dev->dev_id);
|
|
disk->major = rbd_dev->major;
|
|
disk->first_minor = rbd_dev->minor;
|
|
if (single_major)
|
|
disk->flags |= GENHD_FL_EXT_DEVT;
|
|
disk->fops = &rbd_bd_ops;
|
|
disk->private_data = rbd_dev;
|
|
|
|
memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set));
|
|
rbd_dev->tag_set.ops = &rbd_mq_ops;
|
|
rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth;
|
|
rbd_dev->tag_set.numa_node = NUMA_NO_NODE;
|
|
rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE;
|
|
rbd_dev->tag_set.nr_hw_queues = 1;
|
|
rbd_dev->tag_set.cmd_size = sizeof(struct work_struct);
|
|
|
|
err = blk_mq_alloc_tag_set(&rbd_dev->tag_set);
|
|
if (err)
|
|
goto out_disk;
|
|
|
|
q = blk_mq_init_queue(&rbd_dev->tag_set);
|
|
if (IS_ERR(q)) {
|
|
err = PTR_ERR(q);
|
|
goto out_tag_set;
|
|
}
|
|
|
|
blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
|
|
/* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */
|
|
|
|
/* set io sizes to object size */
|
|
segment_size = rbd_obj_bytes(&rbd_dev->header);
|
|
blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE);
|
|
q->limits.max_sectors = queue_max_hw_sectors(q);
|
|
blk_queue_max_segments(q, USHRT_MAX);
|
|
blk_queue_max_segment_size(q, UINT_MAX);
|
|
blk_queue_io_min(q, segment_size);
|
|
blk_queue_io_opt(q, segment_size);
|
|
|
|
/* enable the discard support */
|
|
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
|
|
q->limits.discard_granularity = segment_size;
|
|
blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE);
|
|
blk_queue_max_write_zeroes_sectors(q, segment_size / SECTOR_SIZE);
|
|
|
|
if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC))
|
|
q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES;
|
|
|
|
/*
|
|
* disk_release() expects a queue ref from add_disk() and will
|
|
* put it. Hold an extra ref until add_disk() is called.
|
|
*/
|
|
WARN_ON(!blk_get_queue(q));
|
|
disk->queue = q;
|
|
q->queuedata = rbd_dev;
|
|
|
|
rbd_dev->disk = disk;
|
|
|
|
return 0;
|
|
out_tag_set:
|
|
blk_mq_free_tag_set(&rbd_dev->tag_set);
|
|
out_disk:
|
|
put_disk(disk);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
sysfs
|
|
*/
|
|
|
|
static struct rbd_device *dev_to_rbd_dev(struct device *dev)
|
|
{
|
|
return container_of(dev, struct rbd_device, dev);
|
|
}
|
|
|
|
static ssize_t rbd_size_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%llu\n",
|
|
(unsigned long long)rbd_dev->mapping.size);
|
|
}
|
|
|
|
/*
|
|
* Note this shows the features for whatever's mapped, which is not
|
|
* necessarily the base image.
|
|
*/
|
|
static ssize_t rbd_features_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "0x%016llx\n",
|
|
(unsigned long long)rbd_dev->mapping.features);
|
|
}
|
|
|
|
static ssize_t rbd_major_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
if (rbd_dev->major)
|
|
return sprintf(buf, "%d\n", rbd_dev->major);
|
|
|
|
return sprintf(buf, "(none)\n");
|
|
}
|
|
|
|
static ssize_t rbd_minor_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%d\n", rbd_dev->minor);
|
|
}
|
|
|
|
static ssize_t rbd_client_addr_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
struct ceph_entity_addr *client_addr =
|
|
ceph_client_addr(rbd_dev->rbd_client->client);
|
|
|
|
return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr,
|
|
le32_to_cpu(client_addr->nonce));
|
|
}
|
|
|
|
static ssize_t rbd_client_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "client%lld\n",
|
|
ceph_client_gid(rbd_dev->rbd_client->client));
|
|
}
|
|
|
|
static ssize_t rbd_cluster_fsid_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid);
|
|
}
|
|
|
|
static ssize_t rbd_config_info_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->config_info);
|
|
}
|
|
|
|
static ssize_t rbd_pool_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->pool_name);
|
|
}
|
|
|
|
static ssize_t rbd_pool_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%llu\n",
|
|
(unsigned long long) rbd_dev->spec->pool_id);
|
|
}
|
|
|
|
static ssize_t rbd_name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
if (rbd_dev->spec->image_name)
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_name);
|
|
|
|
return sprintf(buf, "(unknown)\n");
|
|
}
|
|
|
|
static ssize_t rbd_image_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->image_id);
|
|
}
|
|
|
|
/*
|
|
* Shows the name of the currently-mapped snapshot (or
|
|
* RBD_SNAP_HEAD_NAME for the base image).
|
|
*/
|
|
static ssize_t rbd_snap_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%s\n", rbd_dev->spec->snap_name);
|
|
}
|
|
|
|
static ssize_t rbd_snap_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
|
|
return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id);
|
|
}
|
|
|
|
/*
|
|
* For a v2 image, shows the chain of parent images, separated by empty
|
|
* lines. For v1 images or if there is no parent, shows "(no parent
|
|
* image)".
|
|
*/
|
|
static ssize_t rbd_parent_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
ssize_t count = 0;
|
|
|
|
if (!rbd_dev->parent)
|
|
return sprintf(buf, "(no parent image)\n");
|
|
|
|
for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) {
|
|
struct rbd_spec *spec = rbd_dev->parent_spec;
|
|
|
|
count += sprintf(&buf[count], "%s"
|
|
"pool_id %llu\npool_name %s\n"
|
|
"image_id %s\nimage_name %s\n"
|
|
"snap_id %llu\nsnap_name %s\n"
|
|
"overlap %llu\n",
|
|
!count ? "" : "\n", /* first? */
|
|
spec->pool_id, spec->pool_name,
|
|
spec->image_id, spec->image_name ?: "(unknown)",
|
|
spec->snap_id, spec->snap_name,
|
|
rbd_dev->parent_overlap);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t rbd_image_refresh(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t size)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
int ret;
|
|
|
|
ret = rbd_dev_refresh(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return size;
|
|
}
|
|
|
|
static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL);
|
|
static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL);
|
|
static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL);
|
|
static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL);
|
|
static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL);
|
|
static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL);
|
|
static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL);
|
|
static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL);
|
|
static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL);
|
|
static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL);
|
|
static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL);
|
|
static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL);
|
|
static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh);
|
|
static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL);
|
|
static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL);
|
|
static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL);
|
|
|
|
static struct attribute *rbd_attrs[] = {
|
|
&dev_attr_size.attr,
|
|
&dev_attr_features.attr,
|
|
&dev_attr_major.attr,
|
|
&dev_attr_minor.attr,
|
|
&dev_attr_client_addr.attr,
|
|
&dev_attr_client_id.attr,
|
|
&dev_attr_cluster_fsid.attr,
|
|
&dev_attr_config_info.attr,
|
|
&dev_attr_pool.attr,
|
|
&dev_attr_pool_id.attr,
|
|
&dev_attr_name.attr,
|
|
&dev_attr_image_id.attr,
|
|
&dev_attr_current_snap.attr,
|
|
&dev_attr_snap_id.attr,
|
|
&dev_attr_parent.attr,
|
|
&dev_attr_refresh.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group rbd_attr_group = {
|
|
.attrs = rbd_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *rbd_attr_groups[] = {
|
|
&rbd_attr_group,
|
|
NULL
|
|
};
|
|
|
|
static void rbd_dev_release(struct device *dev);
|
|
|
|
static const struct device_type rbd_device_type = {
|
|
.name = "rbd",
|
|
.groups = rbd_attr_groups,
|
|
.release = rbd_dev_release,
|
|
};
|
|
|
|
static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec)
|
|
{
|
|
kref_get(&spec->kref);
|
|
|
|
return spec;
|
|
}
|
|
|
|
static void rbd_spec_free(struct kref *kref);
|
|
static void rbd_spec_put(struct rbd_spec *spec)
|
|
{
|
|
if (spec)
|
|
kref_put(&spec->kref, rbd_spec_free);
|
|
}
|
|
|
|
static struct rbd_spec *rbd_spec_alloc(void)
|
|
{
|
|
struct rbd_spec *spec;
|
|
|
|
spec = kzalloc(sizeof (*spec), GFP_KERNEL);
|
|
if (!spec)
|
|
return NULL;
|
|
|
|
spec->pool_id = CEPH_NOPOOL;
|
|
spec->snap_id = CEPH_NOSNAP;
|
|
kref_init(&spec->kref);
|
|
|
|
return spec;
|
|
}
|
|
|
|
static void rbd_spec_free(struct kref *kref)
|
|
{
|
|
struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref);
|
|
|
|
kfree(spec->pool_name);
|
|
kfree(spec->image_id);
|
|
kfree(spec->image_name);
|
|
kfree(spec->snap_name);
|
|
kfree(spec);
|
|
}
|
|
|
|
static void rbd_dev_free(struct rbd_device *rbd_dev)
|
|
{
|
|
WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED);
|
|
WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED);
|
|
|
|
ceph_oid_destroy(&rbd_dev->header_oid);
|
|
ceph_oloc_destroy(&rbd_dev->header_oloc);
|
|
kfree(rbd_dev->config_info);
|
|
|
|
rbd_put_client(rbd_dev->rbd_client);
|
|
rbd_spec_put(rbd_dev->spec);
|
|
kfree(rbd_dev->opts);
|
|
kfree(rbd_dev);
|
|
}
|
|
|
|
static void rbd_dev_release(struct device *dev)
|
|
{
|
|
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
|
|
bool need_put = !!rbd_dev->opts;
|
|
|
|
if (need_put) {
|
|
destroy_workqueue(rbd_dev->task_wq);
|
|
ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id);
|
|
}
|
|
|
|
rbd_dev_free(rbd_dev);
|
|
|
|
/*
|
|
* This is racy, but way better than putting module outside of
|
|
* the release callback. The race window is pretty small, so
|
|
* doing something similar to dm (dm-builtin.c) is overkill.
|
|
*/
|
|
if (need_put)
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc,
|
|
struct rbd_spec *spec)
|
|
{
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL);
|
|
if (!rbd_dev)
|
|
return NULL;
|
|
|
|
spin_lock_init(&rbd_dev->lock);
|
|
INIT_LIST_HEAD(&rbd_dev->node);
|
|
init_rwsem(&rbd_dev->header_rwsem);
|
|
|
|
rbd_dev->header.data_pool_id = CEPH_NOPOOL;
|
|
ceph_oid_init(&rbd_dev->header_oid);
|
|
rbd_dev->header_oloc.pool = spec->pool_id;
|
|
|
|
mutex_init(&rbd_dev->watch_mutex);
|
|
rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED;
|
|
INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch);
|
|
|
|
init_rwsem(&rbd_dev->lock_rwsem);
|
|
rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED;
|
|
INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock);
|
|
INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock);
|
|
INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock);
|
|
INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work);
|
|
init_waitqueue_head(&rbd_dev->lock_waitq);
|
|
|
|
rbd_dev->dev.bus = &rbd_bus_type;
|
|
rbd_dev->dev.type = &rbd_device_type;
|
|
rbd_dev->dev.parent = &rbd_root_dev;
|
|
device_initialize(&rbd_dev->dev);
|
|
|
|
rbd_dev->rbd_client = rbdc;
|
|
rbd_dev->spec = spec;
|
|
|
|
return rbd_dev;
|
|
}
|
|
|
|
/*
|
|
* Create a mapping rbd_dev.
|
|
*/
|
|
static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
|
|
struct rbd_spec *spec,
|
|
struct rbd_options *opts)
|
|
{
|
|
struct rbd_device *rbd_dev;
|
|
|
|
rbd_dev = __rbd_dev_create(rbdc, spec);
|
|
if (!rbd_dev)
|
|
return NULL;
|
|
|
|
rbd_dev->opts = opts;
|
|
|
|
/* get an id and fill in device name */
|
|
rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0,
|
|
minor_to_rbd_dev_id(1 << MINORBITS),
|
|
GFP_KERNEL);
|
|
if (rbd_dev->dev_id < 0)
|
|
goto fail_rbd_dev;
|
|
|
|
sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id);
|
|
rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM,
|
|
rbd_dev->name);
|
|
if (!rbd_dev->task_wq)
|
|
goto fail_dev_id;
|
|
|
|
/* we have a ref from do_rbd_add() */
|
|
__module_get(THIS_MODULE);
|
|
|
|
dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id);
|
|
return rbd_dev;
|
|
|
|
fail_dev_id:
|
|
ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id);
|
|
fail_rbd_dev:
|
|
rbd_dev_free(rbd_dev);
|
|
return NULL;
|
|
}
|
|
|
|
static void rbd_dev_destroy(struct rbd_device *rbd_dev)
|
|
{
|
|
if (rbd_dev)
|
|
put_device(&rbd_dev->dev);
|
|
}
|
|
|
|
/*
|
|
* Get the size and object order for an image snapshot, or if
|
|
* snap_id is CEPH_NOSNAP, gets this information for the base
|
|
* image.
|
|
*/
|
|
static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u8 *order, u64 *snap_size)
|
|
{
|
|
__le64 snapid = cpu_to_le64(snap_id);
|
|
int ret;
|
|
struct {
|
|
u8 order;
|
|
__le64 size;
|
|
} __attribute__ ((packed)) size_buf = { 0 };
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_size",
|
|
&snapid, sizeof(snapid),
|
|
&size_buf, sizeof(size_buf));
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < sizeof (size_buf))
|
|
return -ERANGE;
|
|
|
|
if (order) {
|
|
*order = size_buf.order;
|
|
dout(" order %u", (unsigned int)*order);
|
|
}
|
|
*snap_size = le64_to_cpu(size_buf.size);
|
|
|
|
dout(" snap_id 0x%016llx snap_size = %llu\n",
|
|
(unsigned long long)snap_id,
|
|
(unsigned long long)*snap_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev)
|
|
{
|
|
return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP,
|
|
&rbd_dev->header.obj_order,
|
|
&rbd_dev->header.image_size);
|
|
}
|
|
|
|
static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
|
|
{
|
|
void *reply_buf;
|
|
int ret;
|
|
void *p;
|
|
|
|
reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_object_prefix",
|
|
NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
p = reply_buf;
|
|
rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p,
|
|
p + ret, NULL, GFP_NOIO);
|
|
ret = 0;
|
|
|
|
if (IS_ERR(rbd_dev->header.object_prefix)) {
|
|
ret = PTR_ERR(rbd_dev->header.object_prefix);
|
|
rbd_dev->header.object_prefix = NULL;
|
|
} else {
|
|
dout(" object_prefix = %s\n", rbd_dev->header.object_prefix);
|
|
}
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
|
|
u64 *snap_features)
|
|
{
|
|
__le64 snapid = cpu_to_le64(snap_id);
|
|
struct {
|
|
__le64 features;
|
|
__le64 incompat;
|
|
} __attribute__ ((packed)) features_buf = { 0 };
|
|
u64 unsup;
|
|
int ret;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_features",
|
|
&snapid, sizeof(snapid),
|
|
&features_buf, sizeof(features_buf));
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < sizeof (features_buf))
|
|
return -ERANGE;
|
|
|
|
unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED;
|
|
if (unsup) {
|
|
rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx",
|
|
unsup);
|
|
return -ENXIO;
|
|
}
|
|
|
|
*snap_features = le64_to_cpu(features_buf.features);
|
|
|
|
dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n",
|
|
(unsigned long long)snap_id,
|
|
(unsigned long long)*snap_features,
|
|
(unsigned long long)le64_to_cpu(features_buf.incompat));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_v2_features(struct rbd_device *rbd_dev)
|
|
{
|
|
return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP,
|
|
&rbd_dev->header.features);
|
|
}
|
|
|
|
static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_spec *parent_spec;
|
|
size_t size;
|
|
void *reply_buf = NULL;
|
|
__le64 snapid;
|
|
void *p;
|
|
void *end;
|
|
u64 pool_id;
|
|
char *image_id;
|
|
u64 snap_id;
|
|
u64 overlap;
|
|
int ret;
|
|
|
|
parent_spec = rbd_spec_alloc();
|
|
if (!parent_spec)
|
|
return -ENOMEM;
|
|
|
|
size = sizeof (__le64) + /* pool_id */
|
|
sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */
|
|
sizeof (__le64) + /* snap_id */
|
|
sizeof (__le64); /* overlap */
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
snapid = cpu_to_le64(rbd_dev->spec->snap_id);
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_parent",
|
|
&snapid, sizeof(snapid), reply_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
ret = -ERANGE;
|
|
ceph_decode_64_safe(&p, end, pool_id, out_err);
|
|
if (pool_id == CEPH_NOPOOL) {
|
|
/*
|
|
* Either the parent never existed, or we have
|
|
* record of it but the image got flattened so it no
|
|
* longer has a parent. When the parent of a
|
|
* layered image disappears we immediately set the
|
|
* overlap to 0. The effect of this is that all new
|
|
* requests will be treated as if the image had no
|
|
* parent.
|
|
*/
|
|
if (rbd_dev->parent_overlap) {
|
|
rbd_dev->parent_overlap = 0;
|
|
rbd_dev_parent_put(rbd_dev);
|
|
pr_info("%s: clone image has been flattened\n",
|
|
rbd_dev->disk->disk_name);
|
|
}
|
|
|
|
goto out; /* No parent? No problem. */
|
|
}
|
|
|
|
/* The ceph file layout needs to fit pool id in 32 bits */
|
|
|
|
ret = -EIO;
|
|
if (pool_id > (u64)U32_MAX) {
|
|
rbd_warn(NULL, "parent pool id too large (%llu > %u)",
|
|
(unsigned long long)pool_id, U32_MAX);
|
|
goto out_err;
|
|
}
|
|
|
|
image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
|
|
if (IS_ERR(image_id)) {
|
|
ret = PTR_ERR(image_id);
|
|
goto out_err;
|
|
}
|
|
ceph_decode_64_safe(&p, end, snap_id, out_err);
|
|
ceph_decode_64_safe(&p, end, overlap, out_err);
|
|
|
|
/*
|
|
* The parent won't change (except when the clone is
|
|
* flattened, already handled that). So we only need to
|
|
* record the parent spec we have not already done so.
|
|
*/
|
|
if (!rbd_dev->parent_spec) {
|
|
parent_spec->pool_id = pool_id;
|
|
parent_spec->image_id = image_id;
|
|
parent_spec->snap_id = snap_id;
|
|
rbd_dev->parent_spec = parent_spec;
|
|
parent_spec = NULL; /* rbd_dev now owns this */
|
|
} else {
|
|
kfree(image_id);
|
|
}
|
|
|
|
/*
|
|
* We always update the parent overlap. If it's zero we issue
|
|
* a warning, as we will proceed as if there was no parent.
|
|
*/
|
|
if (!overlap) {
|
|
if (parent_spec) {
|
|
/* refresh, careful to warn just once */
|
|
if (rbd_dev->parent_overlap)
|
|
rbd_warn(rbd_dev,
|
|
"clone now standalone (overlap became 0)");
|
|
} else {
|
|
/* initial probe */
|
|
rbd_warn(rbd_dev, "clone is standalone (overlap 0)");
|
|
}
|
|
}
|
|
rbd_dev->parent_overlap = overlap;
|
|
|
|
out:
|
|
ret = 0;
|
|
out_err:
|
|
kfree(reply_buf);
|
|
rbd_spec_put(parent_spec);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev)
|
|
{
|
|
struct {
|
|
__le64 stripe_unit;
|
|
__le64 stripe_count;
|
|
} __attribute__ ((packed)) striping_info_buf = { 0 };
|
|
size_t size = sizeof (striping_info_buf);
|
|
void *p;
|
|
int ret;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_stripe_unit_count",
|
|
NULL, 0, &striping_info_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < size)
|
|
return -ERANGE;
|
|
|
|
p = &striping_info_buf;
|
|
rbd_dev->header.stripe_unit = ceph_decode_64(&p);
|
|
rbd_dev->header.stripe_count = ceph_decode_64(&p);
|
|
return 0;
|
|
}
|
|
|
|
static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev)
|
|
{
|
|
__le64 data_pool_id;
|
|
int ret;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_data_pool",
|
|
NULL, 0, &data_pool_id, sizeof(data_pool_id));
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < sizeof(data_pool_id))
|
|
return -EBADMSG;
|
|
|
|
rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id);
|
|
WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL);
|
|
return 0;
|
|
}
|
|
|
|
static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
|
|
{
|
|
CEPH_DEFINE_OID_ONSTACK(oid);
|
|
size_t image_id_size;
|
|
char *image_id;
|
|
void *p;
|
|
void *end;
|
|
size_t size;
|
|
void *reply_buf = NULL;
|
|
size_t len = 0;
|
|
char *image_name = NULL;
|
|
int ret;
|
|
|
|
rbd_assert(!rbd_dev->spec->image_name);
|
|
|
|
len = strlen(rbd_dev->spec->image_id);
|
|
image_id_size = sizeof (__le32) + len;
|
|
image_id = kmalloc(image_id_size, GFP_KERNEL);
|
|
if (!image_id)
|
|
return NULL;
|
|
|
|
p = image_id;
|
|
end = image_id + image_id_size;
|
|
ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len);
|
|
|
|
size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX;
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
goto out;
|
|
|
|
ceph_oid_printf(&oid, "%s", RBD_DIRECTORY);
|
|
ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc,
|
|
"dir_get_name", image_id, image_id_size,
|
|
reply_buf, size);
|
|
if (ret < 0)
|
|
goto out;
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
|
|
image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL);
|
|
if (IS_ERR(image_name))
|
|
image_name = NULL;
|
|
else
|
|
dout("%s: name is %s len is %zd\n", __func__, image_name, len);
|
|
out:
|
|
kfree(reply_buf);
|
|
kfree(image_id);
|
|
|
|
return image_name;
|
|
}
|
|
|
|
static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
|
|
{
|
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc;
|
|
const char *snap_name;
|
|
u32 which = 0;
|
|
|
|
/* Skip over names until we find the one we are looking for */
|
|
|
|
snap_name = rbd_dev->header.snap_names;
|
|
while (which < snapc->num_snaps) {
|
|
if (!strcmp(name, snap_name))
|
|
return snapc->snaps[which];
|
|
snap_name += strlen(snap_name) + 1;
|
|
which++;
|
|
}
|
|
return CEPH_NOSNAP;
|
|
}
|
|
|
|
static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
|
|
{
|
|
struct ceph_snap_context *snapc = rbd_dev->header.snapc;
|
|
u32 which;
|
|
bool found = false;
|
|
u64 snap_id;
|
|
|
|
for (which = 0; !found && which < snapc->num_snaps; which++) {
|
|
const char *snap_name;
|
|
|
|
snap_id = snapc->snaps[which];
|
|
snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id);
|
|
if (IS_ERR(snap_name)) {
|
|
/* ignore no-longer existing snapshots */
|
|
if (PTR_ERR(snap_name) == -ENOENT)
|
|
continue;
|
|
else
|
|
break;
|
|
}
|
|
found = !strcmp(name, snap_name);
|
|
kfree(snap_name);
|
|
}
|
|
return found ? snap_id : CEPH_NOSNAP;
|
|
}
|
|
|
|
/*
|
|
* Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if
|
|
* no snapshot by that name is found, or if an error occurs.
|
|
*/
|
|
static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name)
|
|
{
|
|
if (rbd_dev->image_format == 1)
|
|
return rbd_v1_snap_id_by_name(rbd_dev, name);
|
|
|
|
return rbd_v2_snap_id_by_name(rbd_dev, name);
|
|
}
|
|
|
|
/*
|
|
* An image being mapped will have everything but the snap id.
|
|
*/
|
|
static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_spec *spec = rbd_dev->spec;
|
|
|
|
rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name);
|
|
rbd_assert(spec->image_id && spec->image_name);
|
|
rbd_assert(spec->snap_name);
|
|
|
|
if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) {
|
|
u64 snap_id;
|
|
|
|
snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name);
|
|
if (snap_id == CEPH_NOSNAP)
|
|
return -ENOENT;
|
|
|
|
spec->snap_id = snap_id;
|
|
} else {
|
|
spec->snap_id = CEPH_NOSNAP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* A parent image will have all ids but none of the names.
|
|
*
|
|
* All names in an rbd spec are dynamically allocated. It's OK if we
|
|
* can't figure out the name for an image id.
|
|
*/
|
|
static int rbd_spec_fill_names(struct rbd_device *rbd_dev)
|
|
{
|
|
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
|
|
struct rbd_spec *spec = rbd_dev->spec;
|
|
const char *pool_name;
|
|
const char *image_name;
|
|
const char *snap_name;
|
|
int ret;
|
|
|
|
rbd_assert(spec->pool_id != CEPH_NOPOOL);
|
|
rbd_assert(spec->image_id);
|
|
rbd_assert(spec->snap_id != CEPH_NOSNAP);
|
|
|
|
/* Get the pool name; we have to make our own copy of this */
|
|
|
|
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id);
|
|
if (!pool_name) {
|
|
rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id);
|
|
return -EIO;
|
|
}
|
|
pool_name = kstrdup(pool_name, GFP_KERNEL);
|
|
if (!pool_name)
|
|
return -ENOMEM;
|
|
|
|
/* Fetch the image name; tolerate failure here */
|
|
|
|
image_name = rbd_dev_image_name(rbd_dev);
|
|
if (!image_name)
|
|
rbd_warn(rbd_dev, "unable to get image name");
|
|
|
|
/* Fetch the snapshot name */
|
|
|
|
snap_name = rbd_snap_name(rbd_dev, spec->snap_id);
|
|
if (IS_ERR(snap_name)) {
|
|
ret = PTR_ERR(snap_name);
|
|
goto out_err;
|
|
}
|
|
|
|
spec->pool_name = pool_name;
|
|
spec->image_name = image_name;
|
|
spec->snap_name = snap_name;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
kfree(image_name);
|
|
kfree(pool_name);
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev)
|
|
{
|
|
size_t size;
|
|
int ret;
|
|
void *reply_buf;
|
|
void *p;
|
|
void *end;
|
|
u64 seq;
|
|
u32 snap_count;
|
|
struct ceph_snap_context *snapc;
|
|
u32 i;
|
|
|
|
/*
|
|
* We'll need room for the seq value (maximum snapshot id),
|
|
* snapshot count, and array of that many snapshot ids.
|
|
* For now we have a fixed upper limit on the number we're
|
|
* prepared to receive.
|
|
*/
|
|
size = sizeof (__le64) + sizeof (__le32) +
|
|
RBD_MAX_SNAP_COUNT * sizeof (__le64);
|
|
reply_buf = kzalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return -ENOMEM;
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_snapcontext",
|
|
NULL, 0, reply_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
ret = -ERANGE;
|
|
ceph_decode_64_safe(&p, end, seq, out);
|
|
ceph_decode_32_safe(&p, end, snap_count, out);
|
|
|
|
/*
|
|
* Make sure the reported number of snapshot ids wouldn't go
|
|
* beyond the end of our buffer. But before checking that,
|
|
* make sure the computed size of the snapshot context we
|
|
* allocate is representable in a size_t.
|
|
*/
|
|
if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context))
|
|
/ sizeof (u64)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (!ceph_has_room(&p, end, snap_count * sizeof (__le64)))
|
|
goto out;
|
|
ret = 0;
|
|
|
|
snapc = ceph_create_snap_context(snap_count, GFP_KERNEL);
|
|
if (!snapc) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
snapc->seq = seq;
|
|
for (i = 0; i < snap_count; i++)
|
|
snapc->snaps[i] = ceph_decode_64(&p);
|
|
|
|
ceph_put_snap_context(rbd_dev->header.snapc);
|
|
rbd_dev->header.snapc = snapc;
|
|
|
|
dout(" snap context seq = %llu, snap_count = %u\n",
|
|
(unsigned long long)seq, (unsigned int)snap_count);
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev,
|
|
u64 snap_id)
|
|
{
|
|
size_t size;
|
|
void *reply_buf;
|
|
__le64 snapid;
|
|
int ret;
|
|
void *p;
|
|
void *end;
|
|
char *snap_name;
|
|
|
|
size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN;
|
|
reply_buf = kmalloc(size, GFP_KERNEL);
|
|
if (!reply_buf)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
snapid = cpu_to_le64(snap_id);
|
|
ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid,
|
|
&rbd_dev->header_oloc, "get_snapshot_name",
|
|
&snapid, sizeof(snapid), reply_buf, size);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret < 0) {
|
|
snap_name = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
p = reply_buf;
|
|
end = reply_buf + ret;
|
|
snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
|
|
if (IS_ERR(snap_name))
|
|
goto out;
|
|
|
|
dout(" snap_id 0x%016llx snap_name = %s\n",
|
|
(unsigned long long)snap_id, snap_name);
|
|
out:
|
|
kfree(reply_buf);
|
|
|
|
return snap_name;
|
|
}
|
|
|
|
static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev)
|
|
{
|
|
bool first_time = rbd_dev->header.object_prefix == NULL;
|
|
int ret;
|
|
|
|
ret = rbd_dev_v2_image_size(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (first_time) {
|
|
ret = rbd_dev_v2_header_onetime(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = rbd_dev_v2_snap_context(rbd_dev);
|
|
if (ret && first_time) {
|
|
kfree(rbd_dev->header.object_prefix);
|
|
rbd_dev->header.object_prefix = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_header_info(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
|
|
if (rbd_dev->image_format == 1)
|
|
return rbd_dev_v1_header_info(rbd_dev);
|
|
|
|
return rbd_dev_v2_header_info(rbd_dev);
|
|
}
|
|
|
|
/*
|
|
* Skips over white space at *buf, and updates *buf to point to the
|
|
* first found non-space character (if any). Returns the length of
|
|
* the token (string of non-white space characters) found. Note
|
|
* that *buf must be terminated with '\0'.
|
|
*/
|
|
static inline size_t next_token(const char **buf)
|
|
{
|
|
/*
|
|
* These are the characters that produce nonzero for
|
|
* isspace() in the "C" and "POSIX" locales.
|
|
*/
|
|
const char *spaces = " \f\n\r\t\v";
|
|
|
|
*buf += strspn(*buf, spaces); /* Find start of token */
|
|
|
|
return strcspn(*buf, spaces); /* Return token length */
|
|
}
|
|
|
|
/*
|
|
* Finds the next token in *buf, dynamically allocates a buffer big
|
|
* enough to hold a copy of it, and copies the token into the new
|
|
* buffer. The copy is guaranteed to be terminated with '\0'. Note
|
|
* that a duplicate buffer is created even for a zero-length token.
|
|
*
|
|
* Returns a pointer to the newly-allocated duplicate, or a null
|
|
* pointer if memory for the duplicate was not available. If
|
|
* the lenp argument is a non-null pointer, the length of the token
|
|
* (not including the '\0') is returned in *lenp.
|
|
*
|
|
* If successful, the *buf pointer will be updated to point beyond
|
|
* the end of the found token.
|
|
*
|
|
* Note: uses GFP_KERNEL for allocation.
|
|
*/
|
|
static inline char *dup_token(const char **buf, size_t *lenp)
|
|
{
|
|
char *dup;
|
|
size_t len;
|
|
|
|
len = next_token(buf);
|
|
dup = kmemdup(*buf, len + 1, GFP_KERNEL);
|
|
if (!dup)
|
|
return NULL;
|
|
*(dup + len) = '\0';
|
|
*buf += len;
|
|
|
|
if (lenp)
|
|
*lenp = len;
|
|
|
|
return dup;
|
|
}
|
|
|
|
/*
|
|
* Parse the options provided for an "rbd add" (i.e., rbd image
|
|
* mapping) request. These arrive via a write to /sys/bus/rbd/add,
|
|
* and the data written is passed here via a NUL-terminated buffer.
|
|
* Returns 0 if successful or an error code otherwise.
|
|
*
|
|
* The information extracted from these options is recorded in
|
|
* the other parameters which return dynamically-allocated
|
|
* structures:
|
|
* ceph_opts
|
|
* The address of a pointer that will refer to a ceph options
|
|
* structure. Caller must release the returned pointer using
|
|
* ceph_destroy_options() when it is no longer needed.
|
|
* rbd_opts
|
|
* Address of an rbd options pointer. Fully initialized by
|
|
* this function; caller must release with kfree().
|
|
* spec
|
|
* Address of an rbd image specification pointer. Fully
|
|
* initialized by this function based on parsed options.
|
|
* Caller must release with rbd_spec_put().
|
|
*
|
|
* The options passed take this form:
|
|
* <mon_addrs> <options> <pool_name> <image_name> [<snap_id>]
|
|
* where:
|
|
* <mon_addrs>
|
|
* A comma-separated list of one or more monitor addresses.
|
|
* A monitor address is an ip address, optionally followed
|
|
* by a port number (separated by a colon).
|
|
* I.e.: ip1[:port1][,ip2[:port2]...]
|
|
* <options>
|
|
* A comma-separated list of ceph and/or rbd options.
|
|
* <pool_name>
|
|
* The name of the rados pool containing the rbd image.
|
|
* <image_name>
|
|
* The name of the image in that pool to map.
|
|
* <snap_id>
|
|
* An optional snapshot id. If provided, the mapping will
|
|
* present data from the image at the time that snapshot was
|
|
* created. The image head is used if no snapshot id is
|
|
* provided. Snapshot mappings are always read-only.
|
|
*/
|
|
static int rbd_add_parse_args(const char *buf,
|
|
struct ceph_options **ceph_opts,
|
|
struct rbd_options **opts,
|
|
struct rbd_spec **rbd_spec)
|
|
{
|
|
size_t len;
|
|
char *options;
|
|
const char *mon_addrs;
|
|
char *snap_name;
|
|
size_t mon_addrs_size;
|
|
struct rbd_spec *spec = NULL;
|
|
struct rbd_options *rbd_opts = NULL;
|
|
struct ceph_options *copts;
|
|
int ret;
|
|
|
|
/* The first four tokens are required */
|
|
|
|
len = next_token(&buf);
|
|
if (!len) {
|
|
rbd_warn(NULL, "no monitor address(es) provided");
|
|
return -EINVAL;
|
|
}
|
|
mon_addrs = buf;
|
|
mon_addrs_size = len + 1;
|
|
buf += len;
|
|
|
|
ret = -EINVAL;
|
|
options = dup_token(&buf, NULL);
|
|
if (!options)
|
|
return -ENOMEM;
|
|
if (!*options) {
|
|
rbd_warn(NULL, "no options provided");
|
|
goto out_err;
|
|
}
|
|
|
|
spec = rbd_spec_alloc();
|
|
if (!spec)
|
|
goto out_mem;
|
|
|
|
spec->pool_name = dup_token(&buf, NULL);
|
|
if (!spec->pool_name)
|
|
goto out_mem;
|
|
if (!*spec->pool_name) {
|
|
rbd_warn(NULL, "no pool name provided");
|
|
goto out_err;
|
|
}
|
|
|
|
spec->image_name = dup_token(&buf, NULL);
|
|
if (!spec->image_name)
|
|
goto out_mem;
|
|
if (!*spec->image_name) {
|
|
rbd_warn(NULL, "no image name provided");
|
|
goto out_err;
|
|
}
|
|
|
|
/*
|
|
* Snapshot name is optional; default is to use "-"
|
|
* (indicating the head/no snapshot).
|
|
*/
|
|
len = next_token(&buf);
|
|
if (!len) {
|
|
buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */
|
|
len = sizeof (RBD_SNAP_HEAD_NAME) - 1;
|
|
} else if (len > RBD_MAX_SNAP_NAME_LEN) {
|
|
ret = -ENAMETOOLONG;
|
|
goto out_err;
|
|
}
|
|
snap_name = kmemdup(buf, len + 1, GFP_KERNEL);
|
|
if (!snap_name)
|
|
goto out_mem;
|
|
*(snap_name + len) = '\0';
|
|
spec->snap_name = snap_name;
|
|
|
|
/* Initialize all rbd options to the defaults */
|
|
|
|
rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL);
|
|
if (!rbd_opts)
|
|
goto out_mem;
|
|
|
|
rbd_opts->read_only = RBD_READ_ONLY_DEFAULT;
|
|
rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT;
|
|
rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT;
|
|
rbd_opts->exclusive = RBD_EXCLUSIVE_DEFAULT;
|
|
|
|
copts = ceph_parse_options(options, mon_addrs,
|
|
mon_addrs + mon_addrs_size - 1,
|
|
parse_rbd_opts_token, rbd_opts);
|
|
if (IS_ERR(copts)) {
|
|
ret = PTR_ERR(copts);
|
|
goto out_err;
|
|
}
|
|
kfree(options);
|
|
|
|
*ceph_opts = copts;
|
|
*opts = rbd_opts;
|
|
*rbd_spec = spec;
|
|
|
|
return 0;
|
|
out_mem:
|
|
ret = -ENOMEM;
|
|
out_err:
|
|
kfree(rbd_opts);
|
|
rbd_spec_put(spec);
|
|
kfree(options);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_dev_image_unlock(struct rbd_device *rbd_dev)
|
|
{
|
|
down_write(&rbd_dev->lock_rwsem);
|
|
if (__rbd_is_lock_owner(rbd_dev))
|
|
rbd_unlock(rbd_dev);
|
|
up_write(&rbd_dev->lock_rwsem);
|
|
}
|
|
|
|
static int rbd_add_acquire_lock(struct rbd_device *rbd_dev)
|
|
{
|
|
if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) {
|
|
rbd_warn(rbd_dev, "exclusive-lock feature is not enabled");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* FIXME: "rbd map --exclusive" should be in interruptible */
|
|
down_read(&rbd_dev->lock_rwsem);
|
|
rbd_wait_state_locked(rbd_dev);
|
|
up_read(&rbd_dev->lock_rwsem);
|
|
if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) {
|
|
rbd_warn(rbd_dev, "failed to acquire exclusive lock");
|
|
return -EROFS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* An rbd format 2 image has a unique identifier, distinct from the
|
|
* name given to it by the user. Internally, that identifier is
|
|
* what's used to specify the names of objects related to the image.
|
|
*
|
|
* A special "rbd id" object is used to map an rbd image name to its
|
|
* id. If that object doesn't exist, then there is no v2 rbd image
|
|
* with the supplied name.
|
|
*
|
|
* This function will record the given rbd_dev's image_id field if
|
|
* it can be determined, and in that case will return 0. If any
|
|
* errors occur a negative errno will be returned and the rbd_dev's
|
|
* image_id field will be unchanged (and should be NULL).
|
|
*/
|
|
static int rbd_dev_image_id(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
size_t size;
|
|
CEPH_DEFINE_OID_ONSTACK(oid);
|
|
void *response;
|
|
char *image_id;
|
|
|
|
/*
|
|
* When probing a parent image, the image id is already
|
|
* known (and the image name likely is not). There's no
|
|
* need to fetch the image id again in this case. We
|
|
* do still need to set the image format though.
|
|
*/
|
|
if (rbd_dev->spec->image_id) {
|
|
rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* First, see if the format 2 image id file exists, and if
|
|
* so, get the image's persistent id from it.
|
|
*/
|
|
ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX,
|
|
rbd_dev->spec->image_name);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dout("rbd id object name is %s\n", oid.name);
|
|
|
|
/* Response will be an encoded string, which includes a length */
|
|
|
|
size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX;
|
|
response = kzalloc(size, GFP_NOIO);
|
|
if (!response) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* If it doesn't exist we'll assume it's a format 1 image */
|
|
|
|
ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc,
|
|
"get_id", NULL, 0,
|
|
response, RBD_IMAGE_ID_LEN_MAX);
|
|
dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret);
|
|
if (ret == -ENOENT) {
|
|
image_id = kstrdup("", GFP_KERNEL);
|
|
ret = image_id ? 0 : -ENOMEM;
|
|
if (!ret)
|
|
rbd_dev->image_format = 1;
|
|
} else if (ret >= 0) {
|
|
void *p = response;
|
|
|
|
image_id = ceph_extract_encoded_string(&p, p + ret,
|
|
NULL, GFP_NOIO);
|
|
ret = PTR_ERR_OR_ZERO(image_id);
|
|
if (!ret)
|
|
rbd_dev->image_format = 2;
|
|
}
|
|
|
|
if (!ret) {
|
|
rbd_dev->spec->image_id = image_id;
|
|
dout("image_id is %s\n", image_id);
|
|
}
|
|
out:
|
|
kfree(response);
|
|
ceph_oid_destroy(&oid);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Undo whatever state changes are made by v1 or v2 header info
|
|
* call.
|
|
*/
|
|
static void rbd_dev_unprobe(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_image_header *header;
|
|
|
|
rbd_dev_parent_put(rbd_dev);
|
|
|
|
/* Free dynamic fields from the header, then zero it out */
|
|
|
|
header = &rbd_dev->header;
|
|
ceph_put_snap_context(header->snapc);
|
|
kfree(header->snap_sizes);
|
|
kfree(header->snap_names);
|
|
kfree(header->object_prefix);
|
|
memset(header, 0, sizeof (*header));
|
|
}
|
|
|
|
static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = rbd_dev_v2_object_prefix(rbd_dev);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/*
|
|
* Get the and check features for the image. Currently the
|
|
* features are assumed to never change.
|
|
*/
|
|
ret = rbd_dev_v2_features(rbd_dev);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
/* If the image supports fancy striping, get its parameters */
|
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) {
|
|
ret = rbd_dev_v2_striping_info(rbd_dev);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
}
|
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) {
|
|
ret = rbd_dev_v2_data_pool(rbd_dev);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
rbd_init_layout(rbd_dev);
|
|
return 0;
|
|
|
|
out_err:
|
|
rbd_dev->header.features = 0;
|
|
kfree(rbd_dev->header.object_prefix);
|
|
rbd_dev->header.object_prefix = NULL;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() ->
|
|
* rbd_dev_image_probe() recursion depth, which means it's also the
|
|
* length of the already discovered part of the parent chain.
|
|
*/
|
|
static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth)
|
|
{
|
|
struct rbd_device *parent = NULL;
|
|
int ret;
|
|
|
|
if (!rbd_dev->parent_spec)
|
|
return 0;
|
|
|
|
if (++depth > RBD_MAX_PARENT_CHAIN_LEN) {
|
|
pr_info("parent chain is too long (%d)\n", depth);
|
|
ret = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
|
|
parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec);
|
|
if (!parent) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
/*
|
|
* Images related by parent/child relationships always share
|
|
* rbd_client and spec/parent_spec, so bump their refcounts.
|
|
*/
|
|
__rbd_get_client(rbd_dev->rbd_client);
|
|
rbd_spec_get(rbd_dev->parent_spec);
|
|
|
|
ret = rbd_dev_image_probe(parent, depth);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
rbd_dev->parent = parent;
|
|
atomic_set(&rbd_dev->parent_ref, 1);
|
|
return 0;
|
|
|
|
out_err:
|
|
rbd_dev_unparent(rbd_dev);
|
|
rbd_dev_destroy(parent);
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_dev_device_release(struct rbd_device *rbd_dev)
|
|
{
|
|
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
|
|
rbd_dev_mapping_clear(rbd_dev);
|
|
rbd_free_disk(rbd_dev);
|
|
if (!single_major)
|
|
unregister_blkdev(rbd_dev->major, rbd_dev->name);
|
|
}
|
|
|
|
/*
|
|
* rbd_dev->header_rwsem must be locked for write and will be unlocked
|
|
* upon return.
|
|
*/
|
|
static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
|
|
{
|
|
int ret;
|
|
|
|
/* Record our major and minor device numbers. */
|
|
|
|
if (!single_major) {
|
|
ret = register_blkdev(0, rbd_dev->name);
|
|
if (ret < 0)
|
|
goto err_out_unlock;
|
|
|
|
rbd_dev->major = ret;
|
|
rbd_dev->minor = 0;
|
|
} else {
|
|
rbd_dev->major = rbd_major;
|
|
rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id);
|
|
}
|
|
|
|
/* Set up the blkdev mapping. */
|
|
|
|
ret = rbd_init_disk(rbd_dev);
|
|
if (ret)
|
|
goto err_out_blkdev;
|
|
|
|
ret = rbd_dev_mapping_set(rbd_dev);
|
|
if (ret)
|
|
goto err_out_disk;
|
|
|
|
set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
|
|
set_disk_ro(rbd_dev->disk, rbd_dev->opts->read_only);
|
|
|
|
ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id);
|
|
if (ret)
|
|
goto err_out_mapping;
|
|
|
|
set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
|
|
up_write(&rbd_dev->header_rwsem);
|
|
return 0;
|
|
|
|
err_out_mapping:
|
|
rbd_dev_mapping_clear(rbd_dev);
|
|
err_out_disk:
|
|
rbd_free_disk(rbd_dev);
|
|
err_out_blkdev:
|
|
if (!single_major)
|
|
unregister_blkdev(rbd_dev->major, rbd_dev->name);
|
|
err_out_unlock:
|
|
up_write(&rbd_dev->header_rwsem);
|
|
return ret;
|
|
}
|
|
|
|
static int rbd_dev_header_name(struct rbd_device *rbd_dev)
|
|
{
|
|
struct rbd_spec *spec = rbd_dev->spec;
|
|
int ret;
|
|
|
|
/* Record the header object name for this rbd image. */
|
|
|
|
rbd_assert(rbd_image_format_valid(rbd_dev->image_format));
|
|
if (rbd_dev->image_format == 1)
|
|
ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s",
|
|
spec->image_name, RBD_SUFFIX);
|
|
else
|
|
ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s",
|
|
RBD_HEADER_PREFIX, spec->image_id);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_dev_image_release(struct rbd_device *rbd_dev)
|
|
{
|
|
rbd_dev_unprobe(rbd_dev);
|
|
if (rbd_dev->opts)
|
|
rbd_unregister_watch(rbd_dev);
|
|
rbd_dev->image_format = 0;
|
|
kfree(rbd_dev->spec->image_id);
|
|
rbd_dev->spec->image_id = NULL;
|
|
}
|
|
|
|
/*
|
|
* Probe for the existence of the header object for the given rbd
|
|
* device. If this image is the one being mapped (i.e., not a
|
|
* parent), initiate a watch on its header object before using that
|
|
* object to get detailed information about the rbd image.
|
|
*/
|
|
static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Get the id from the image id object. Unless there's an
|
|
* error, rbd_dev->spec->image_id will be filled in with
|
|
* a dynamically-allocated string, and rbd_dev->image_format
|
|
* will be set to either 1 or 2.
|
|
*/
|
|
ret = rbd_dev_image_id(rbd_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = rbd_dev_header_name(rbd_dev);
|
|
if (ret)
|
|
goto err_out_format;
|
|
|
|
if (!depth) {
|
|
ret = rbd_register_watch(rbd_dev);
|
|
if (ret) {
|
|
if (ret == -ENOENT)
|
|
pr_info("image %s/%s does not exist\n",
|
|
rbd_dev->spec->pool_name,
|
|
rbd_dev->spec->image_name);
|
|
goto err_out_format;
|
|
}
|
|
}
|
|
|
|
ret = rbd_dev_header_info(rbd_dev);
|
|
if (ret)
|
|
goto err_out_watch;
|
|
|
|
/*
|
|
* If this image is the one being mapped, we have pool name and
|
|
* id, image name and id, and snap name - need to fill snap id.
|
|
* Otherwise this is a parent image, identified by pool, image
|
|
* and snap ids - need to fill in names for those ids.
|
|
*/
|
|
if (!depth)
|
|
ret = rbd_spec_fill_snap_id(rbd_dev);
|
|
else
|
|
ret = rbd_spec_fill_names(rbd_dev);
|
|
if (ret) {
|
|
if (ret == -ENOENT)
|
|
pr_info("snap %s/%s@%s does not exist\n",
|
|
rbd_dev->spec->pool_name,
|
|
rbd_dev->spec->image_name,
|
|
rbd_dev->spec->snap_name);
|
|
goto err_out_probe;
|
|
}
|
|
|
|
if (rbd_dev->header.features & RBD_FEATURE_LAYERING) {
|
|
ret = rbd_dev_v2_parent_info(rbd_dev);
|
|
if (ret)
|
|
goto err_out_probe;
|
|
|
|
/*
|
|
* Need to warn users if this image is the one being
|
|
* mapped and has a parent.
|
|
*/
|
|
if (!depth && rbd_dev->parent_spec)
|
|
rbd_warn(rbd_dev,
|
|
"WARNING: kernel layering is EXPERIMENTAL!");
|
|
}
|
|
|
|
ret = rbd_dev_probe_parent(rbd_dev, depth);
|
|
if (ret)
|
|
goto err_out_probe;
|
|
|
|
dout("discovered format %u image, header name is %s\n",
|
|
rbd_dev->image_format, rbd_dev->header_oid.name);
|
|
return 0;
|
|
|
|
err_out_probe:
|
|
rbd_dev_unprobe(rbd_dev);
|
|
err_out_watch:
|
|
if (!depth)
|
|
rbd_unregister_watch(rbd_dev);
|
|
err_out_format:
|
|
rbd_dev->image_format = 0;
|
|
kfree(rbd_dev->spec->image_id);
|
|
rbd_dev->spec->image_id = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t do_rbd_add(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct rbd_device *rbd_dev = NULL;
|
|
struct ceph_options *ceph_opts = NULL;
|
|
struct rbd_options *rbd_opts = NULL;
|
|
struct rbd_spec *spec = NULL;
|
|
struct rbd_client *rbdc;
|
|
int rc;
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return -ENODEV;
|
|
|
|
/* parse add command */
|
|
rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec);
|
|
if (rc < 0)
|
|
goto out;
|
|
|
|
rbdc = rbd_get_client(ceph_opts);
|
|
if (IS_ERR(rbdc)) {
|
|
rc = PTR_ERR(rbdc);
|
|
goto err_out_args;
|
|
}
|
|
|
|
/* pick the pool */
|
|
rc = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, spec->pool_name);
|
|
if (rc < 0) {
|
|
if (rc == -ENOENT)
|
|
pr_info("pool %s does not exist\n", spec->pool_name);
|
|
goto err_out_client;
|
|
}
|
|
spec->pool_id = (u64)rc;
|
|
|
|
rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts);
|
|
if (!rbd_dev) {
|
|
rc = -ENOMEM;
|
|
goto err_out_client;
|
|
}
|
|
rbdc = NULL; /* rbd_dev now owns this */
|
|
spec = NULL; /* rbd_dev now owns this */
|
|
rbd_opts = NULL; /* rbd_dev now owns this */
|
|
|
|
rbd_dev->config_info = kstrdup(buf, GFP_KERNEL);
|
|
if (!rbd_dev->config_info) {
|
|
rc = -ENOMEM;
|
|
goto err_out_rbd_dev;
|
|
}
|
|
|
|
down_write(&rbd_dev->header_rwsem);
|
|
rc = rbd_dev_image_probe(rbd_dev, 0);
|
|
if (rc < 0) {
|
|
up_write(&rbd_dev->header_rwsem);
|
|
goto err_out_rbd_dev;
|
|
}
|
|
|
|
/* If we are mapping a snapshot it must be marked read-only */
|
|
if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
|
|
rbd_dev->opts->read_only = true;
|
|
|
|
rc = rbd_dev_device_setup(rbd_dev);
|
|
if (rc)
|
|
goto err_out_image_probe;
|
|
|
|
if (rbd_dev->opts->exclusive) {
|
|
rc = rbd_add_acquire_lock(rbd_dev);
|
|
if (rc)
|
|
goto err_out_device_setup;
|
|
}
|
|
|
|
/* Everything's ready. Announce the disk to the world. */
|
|
|
|
rc = device_add(&rbd_dev->dev);
|
|
if (rc)
|
|
goto err_out_image_lock;
|
|
|
|
add_disk(rbd_dev->disk);
|
|
/* see rbd_init_disk() */
|
|
blk_put_queue(rbd_dev->disk->queue);
|
|
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_add_tail(&rbd_dev->node, &rbd_dev_list);
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
|
|
pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name,
|
|
(unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT,
|
|
rbd_dev->header.features);
|
|
rc = count;
|
|
out:
|
|
module_put(THIS_MODULE);
|
|
return rc;
|
|
|
|
err_out_image_lock:
|
|
rbd_dev_image_unlock(rbd_dev);
|
|
err_out_device_setup:
|
|
rbd_dev_device_release(rbd_dev);
|
|
err_out_image_probe:
|
|
rbd_dev_image_release(rbd_dev);
|
|
err_out_rbd_dev:
|
|
rbd_dev_destroy(rbd_dev);
|
|
err_out_client:
|
|
rbd_put_client(rbdc);
|
|
err_out_args:
|
|
rbd_spec_put(spec);
|
|
kfree(rbd_opts);
|
|
goto out;
|
|
}
|
|
|
|
static ssize_t rbd_add(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
if (single_major)
|
|
return -EINVAL;
|
|
|
|
return do_rbd_add(bus, buf, count);
|
|
}
|
|
|
|
static ssize_t rbd_add_single_major(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
return do_rbd_add(bus, buf, count);
|
|
}
|
|
|
|
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev)
|
|
{
|
|
while (rbd_dev->parent) {
|
|
struct rbd_device *first = rbd_dev;
|
|
struct rbd_device *second = first->parent;
|
|
struct rbd_device *third;
|
|
|
|
/*
|
|
* Follow to the parent with no grandparent and
|
|
* remove it.
|
|
*/
|
|
while (second && (third = second->parent)) {
|
|
first = second;
|
|
second = third;
|
|
}
|
|
rbd_assert(second);
|
|
rbd_dev_image_release(second);
|
|
rbd_dev_destroy(second);
|
|
first->parent = NULL;
|
|
first->parent_overlap = 0;
|
|
|
|
rbd_assert(first->parent_spec);
|
|
rbd_spec_put(first->parent_spec);
|
|
first->parent_spec = NULL;
|
|
}
|
|
}
|
|
|
|
static ssize_t do_rbd_remove(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct rbd_device *rbd_dev = NULL;
|
|
struct list_head *tmp;
|
|
int dev_id;
|
|
char opt_buf[6];
|
|
bool already = false;
|
|
bool force = false;
|
|
int ret;
|
|
|
|
dev_id = -1;
|
|
opt_buf[0] = '\0';
|
|
sscanf(buf, "%d %5s", &dev_id, opt_buf);
|
|
if (dev_id < 0) {
|
|
pr_err("dev_id out of range\n");
|
|
return -EINVAL;
|
|
}
|
|
if (opt_buf[0] != '\0') {
|
|
if (!strcmp(opt_buf, "force")) {
|
|
force = true;
|
|
} else {
|
|
pr_err("bad remove option at '%s'\n", opt_buf);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
ret = -ENOENT;
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_for_each(tmp, &rbd_dev_list) {
|
|
rbd_dev = list_entry(tmp, struct rbd_device, node);
|
|
if (rbd_dev->dev_id == dev_id) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (!ret) {
|
|
spin_lock_irq(&rbd_dev->lock);
|
|
if (rbd_dev->open_count && !force)
|
|
ret = -EBUSY;
|
|
else
|
|
already = test_and_set_bit(RBD_DEV_FLAG_REMOVING,
|
|
&rbd_dev->flags);
|
|
spin_unlock_irq(&rbd_dev->lock);
|
|
}
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
if (ret < 0 || already)
|
|
return ret;
|
|
|
|
if (force) {
|
|
/*
|
|
* Prevent new IO from being queued and wait for existing
|
|
* IO to complete/fail.
|
|
*/
|
|
blk_mq_freeze_queue(rbd_dev->disk->queue);
|
|
blk_set_queue_dying(rbd_dev->disk->queue);
|
|
}
|
|
|
|
del_gendisk(rbd_dev->disk);
|
|
spin_lock(&rbd_dev_list_lock);
|
|
list_del_init(&rbd_dev->node);
|
|
spin_unlock(&rbd_dev_list_lock);
|
|
device_del(&rbd_dev->dev);
|
|
|
|
rbd_dev_image_unlock(rbd_dev);
|
|
rbd_dev_device_release(rbd_dev);
|
|
rbd_dev_image_release(rbd_dev);
|
|
rbd_dev_destroy(rbd_dev);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t rbd_remove(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
if (single_major)
|
|
return -EINVAL;
|
|
|
|
return do_rbd_remove(bus, buf, count);
|
|
}
|
|
|
|
static ssize_t rbd_remove_single_major(struct bus_type *bus,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
return do_rbd_remove(bus, buf, count);
|
|
}
|
|
|
|
/*
|
|
* create control files in sysfs
|
|
* /sys/bus/rbd/...
|
|
*/
|
|
static int rbd_sysfs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = device_register(&rbd_root_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = bus_register(&rbd_bus_type);
|
|
if (ret < 0)
|
|
device_unregister(&rbd_root_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rbd_sysfs_cleanup(void)
|
|
{
|
|
bus_unregister(&rbd_bus_type);
|
|
device_unregister(&rbd_root_dev);
|
|
}
|
|
|
|
static int rbd_slab_init(void)
|
|
{
|
|
rbd_assert(!rbd_img_request_cache);
|
|
rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0);
|
|
if (!rbd_img_request_cache)
|
|
return -ENOMEM;
|
|
|
|
rbd_assert(!rbd_obj_request_cache);
|
|
rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0);
|
|
if (!rbd_obj_request_cache)
|
|
goto out_err;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
kmem_cache_destroy(rbd_img_request_cache);
|
|
rbd_img_request_cache = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void rbd_slab_exit(void)
|
|
{
|
|
rbd_assert(rbd_obj_request_cache);
|
|
kmem_cache_destroy(rbd_obj_request_cache);
|
|
rbd_obj_request_cache = NULL;
|
|
|
|
rbd_assert(rbd_img_request_cache);
|
|
kmem_cache_destroy(rbd_img_request_cache);
|
|
rbd_img_request_cache = NULL;
|
|
}
|
|
|
|
static int __init rbd_init(void)
|
|
{
|
|
int rc;
|
|
|
|
if (!libceph_compatible(NULL)) {
|
|
rbd_warn(NULL, "libceph incompatibility (quitting)");
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = rbd_slab_init();
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* The number of active work items is limited by the number of
|
|
* rbd devices * queue depth, so leave @max_active at default.
|
|
*/
|
|
rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0);
|
|
if (!rbd_wq) {
|
|
rc = -ENOMEM;
|
|
goto err_out_slab;
|
|
}
|
|
|
|
if (single_major) {
|
|
rbd_major = register_blkdev(0, RBD_DRV_NAME);
|
|
if (rbd_major < 0) {
|
|
rc = rbd_major;
|
|
goto err_out_wq;
|
|
}
|
|
}
|
|
|
|
rc = rbd_sysfs_init();
|
|
if (rc)
|
|
goto err_out_blkdev;
|
|
|
|
if (single_major)
|
|
pr_info("loaded (major %d)\n", rbd_major);
|
|
else
|
|
pr_info("loaded\n");
|
|
|
|
return 0;
|
|
|
|
err_out_blkdev:
|
|
if (single_major)
|
|
unregister_blkdev(rbd_major, RBD_DRV_NAME);
|
|
err_out_wq:
|
|
destroy_workqueue(rbd_wq);
|
|
err_out_slab:
|
|
rbd_slab_exit();
|
|
return rc;
|
|
}
|
|
|
|
static void __exit rbd_exit(void)
|
|
{
|
|
ida_destroy(&rbd_dev_id_ida);
|
|
rbd_sysfs_cleanup();
|
|
if (single_major)
|
|
unregister_blkdev(rbd_major, RBD_DRV_NAME);
|
|
destroy_workqueue(rbd_wq);
|
|
rbd_slab_exit();
|
|
}
|
|
|
|
module_init(rbd_init);
|
|
module_exit(rbd_exit);
|
|
|
|
MODULE_AUTHOR("Alex Elder <elder@inktank.com>");
|
|
MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
|
|
MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
|
|
/* following authorship retained from original osdblk.c */
|
|
MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>");
|
|
|
|
MODULE_DESCRIPTION("RADOS Block Device (RBD) driver");
|
|
MODULE_LICENSE("GPL");
|