211 lines
7.4 KiB
C
211 lines
7.4 KiB
C
/*
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* linux/fs/nfs/blocklayout/blocklayout.h
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*
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* Module for the NFSv4.1 pNFS block layout driver.
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*
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* Copyright (c) 2006 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@citi.umich.edu>
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* Fred Isaman <iisaman@umich.edu>
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*
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* permission is granted to use, copy, create derivative works and
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* redistribute this software and such derivative works for any purpose,
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* so long as the name of the university of michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization. if
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* the above copyright notice or any other identification of the
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* university of michigan is included in any copy of any portion of
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* this software, then the disclaimer below must also be included.
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*
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* this software is provided as is, without representation from the
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* university of michigan as to its fitness for any purpose, and without
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* warranty by the university of michigan of any kind, either express
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* or implied, including without limitation the implied warranties of
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* merchantability and fitness for a particular purpose. the regents
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* of the university of michigan shall not be liable for any damages,
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* including special, indirect, incidental, or consequential damages,
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* with respect to any claim arising out or in connection with the use
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* of the software, even if it has been or is hereafter advised of the
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* possibility of such damages.
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*/
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#ifndef FS_NFS_NFS4BLOCKLAYOUT_H
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#define FS_NFS_NFS4BLOCKLAYOUT_H
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#include <linux/device-mapper.h>
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#include <linux/nfs_fs.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include "../pnfs.h"
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#include "../netns.h"
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#define PAGE_CACHE_SECTORS (PAGE_CACHE_SIZE >> SECTOR_SHIFT)
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#define PAGE_CACHE_SECTOR_SHIFT (PAGE_CACHE_SHIFT - SECTOR_SHIFT)
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#define SECTOR_SIZE (1 << SECTOR_SHIFT)
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struct block_mount_id {
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spinlock_t bm_lock; /* protects list */
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struct list_head bm_devlist; /* holds pnfs_block_dev */
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};
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struct pnfs_block_dev {
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struct list_head bm_node;
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struct nfs4_deviceid bm_mdevid; /* associated devid */
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struct block_device *bm_mdev; /* meta device itself */
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struct net *net;
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};
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enum exstate4 {
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PNFS_BLOCK_READWRITE_DATA = 0,
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PNFS_BLOCK_READ_DATA = 1,
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PNFS_BLOCK_INVALID_DATA = 2, /* mapped, but data is invalid */
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PNFS_BLOCK_NONE_DATA = 3 /* unmapped, it's a hole */
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};
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#define MY_MAX_TAGS (15) /* tag bitnums used must be less than this */
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struct my_tree {
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sector_t mtt_step_size; /* Internal sector alignment */
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struct list_head mtt_stub; /* Should be a radix tree */
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};
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struct pnfs_inval_markings {
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spinlock_t im_lock;
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struct my_tree im_tree; /* Sectors that need LAYOUTCOMMIT */
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sector_t im_block_size; /* Server blocksize in sectors */
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struct list_head im_extents; /* Short extents for INVAL->RW conversion */
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};
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struct pnfs_inval_tracking {
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struct list_head it_link;
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int it_sector;
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int it_tags;
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};
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/* sector_t fields are all in 512-byte sectors */
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struct pnfs_block_extent {
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struct kref be_refcnt;
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struct list_head be_node; /* link into lseg list */
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struct nfs4_deviceid be_devid; /* FIXME: could use device cache instead */
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struct block_device *be_mdev;
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sector_t be_f_offset; /* the starting offset in the file */
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sector_t be_length; /* the size of the extent */
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sector_t be_v_offset; /* the starting offset in the volume */
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enum exstate4 be_state; /* the state of this extent */
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struct pnfs_inval_markings *be_inval; /* tracks INVAL->RW transition */
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};
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/* Shortened extent used by LAYOUTCOMMIT */
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struct pnfs_block_short_extent {
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struct list_head bse_node;
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struct nfs4_deviceid bse_devid;
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struct block_device *bse_mdev;
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sector_t bse_f_offset; /* the starting offset in the file */
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sector_t bse_length; /* the size of the extent */
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};
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static inline void
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BL_INIT_INVAL_MARKS(struct pnfs_inval_markings *marks, sector_t blocksize)
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{
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spin_lock_init(&marks->im_lock);
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INIT_LIST_HEAD(&marks->im_tree.mtt_stub);
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INIT_LIST_HEAD(&marks->im_extents);
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marks->im_block_size = blocksize;
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marks->im_tree.mtt_step_size = min((sector_t)PAGE_CACHE_SECTORS,
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blocksize);
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}
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enum extentclass4 {
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RW_EXTENT = 0, /* READWRTE and INVAL */
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RO_EXTENT = 1, /* READ and NONE */
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EXTENT_LISTS = 2,
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};
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static inline int bl_choose_list(enum exstate4 state)
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{
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if (state == PNFS_BLOCK_READ_DATA || state == PNFS_BLOCK_NONE_DATA)
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return RO_EXTENT;
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else
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return RW_EXTENT;
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}
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struct pnfs_block_layout {
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struct pnfs_layout_hdr bl_layout;
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struct pnfs_inval_markings bl_inval; /* tracks INVAL->RW transition */
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spinlock_t bl_ext_lock; /* Protects list manipulation */
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struct list_head bl_extents[EXTENT_LISTS]; /* R and RW extents */
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struct list_head bl_commit; /* Needs layout commit */
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struct list_head bl_committing; /* Layout committing */
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unsigned int bl_count; /* entries in bl_commit */
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sector_t bl_blocksize; /* Server blocksize in sectors */
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};
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#define BLK_ID(lo) ((struct block_mount_id *)(NFS_SERVER(lo->plh_inode)->pnfs_ld_data))
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static inline struct pnfs_block_layout *
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BLK_LO2EXT(struct pnfs_layout_hdr *lo)
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{
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return container_of(lo, struct pnfs_block_layout, bl_layout);
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}
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static inline struct pnfs_block_layout *
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BLK_LSEG2EXT(struct pnfs_layout_segment *lseg)
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{
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return BLK_LO2EXT(lseg->pls_layout);
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}
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struct bl_pipe_msg {
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struct rpc_pipe_msg msg;
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wait_queue_head_t *bl_wq;
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};
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struct bl_msg_hdr {
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u8 type;
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u16 totallen; /* length of entire message, including hdr itself */
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};
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#define BL_DEVICE_UMOUNT 0x0 /* Umount--delete devices */
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#define BL_DEVICE_MOUNT 0x1 /* Mount--create devices*/
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#define BL_DEVICE_REQUEST_INIT 0x0 /* Start request */
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#define BL_DEVICE_REQUEST_PROC 0x1 /* User level process succeeds */
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#define BL_DEVICE_REQUEST_ERR 0x2 /* User level process fails */
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/* blocklayoutdev.c */
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ssize_t bl_pipe_downcall(struct file *, const char __user *, size_t);
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void bl_pipe_destroy_msg(struct rpc_pipe_msg *);
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int nfs4_blkdev_put(struct block_device *bdev);
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struct pnfs_block_dev *nfs4_blk_decode_device(struct nfs_server *server,
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struct pnfs_device *dev);
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int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
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struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
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/* blocklayoutdm.c */
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void bl_free_block_dev(struct pnfs_block_dev *bdev);
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/* extents.c */
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struct pnfs_block_extent *
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bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect,
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struct pnfs_block_extent **cow_read);
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int bl_mark_sectors_init(struct pnfs_inval_markings *marks,
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sector_t offset, sector_t length);
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void bl_put_extent(struct pnfs_block_extent *be);
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struct pnfs_block_extent *bl_alloc_extent(void);
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int bl_is_sector_init(struct pnfs_inval_markings *marks, sector_t isect);
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int encode_pnfs_block_layoutupdate(struct pnfs_block_layout *bl,
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struct xdr_stream *xdr,
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const struct nfs4_layoutcommit_args *arg);
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void clean_pnfs_block_layoutupdate(struct pnfs_block_layout *bl,
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const struct nfs4_layoutcommit_args *arg,
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int status);
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int bl_add_merge_extent(struct pnfs_block_layout *bl,
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struct pnfs_block_extent *new);
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int bl_mark_for_commit(struct pnfs_block_extent *be,
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sector_t offset, sector_t length,
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struct pnfs_block_short_extent *new);
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int bl_push_one_short_extent(struct pnfs_inval_markings *marks);
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struct pnfs_block_short_extent *
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bl_pop_one_short_extent(struct pnfs_inval_markings *marks);
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void bl_free_short_extents(struct pnfs_inval_markings *marks, int num_to_free);
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#endif /* FS_NFS_NFS4BLOCKLAYOUT_H */
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