587 lines
16 KiB
C
587 lines
16 KiB
C
/*
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* (C) 2001 Clemson University and The University of Chicago
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*
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* See COPYING in top-level directory.
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*/
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/*
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* The ORANGEFS Linux kernel support allows ORANGEFS volumes to be mounted and
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* accessed through the Linux VFS (i.e. using standard I/O system calls).
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* This support is only needed on clients that wish to mount the file system.
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*
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*/
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/*
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* Declarations and macros for the ORANGEFS Linux kernel support.
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*/
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#ifndef __ORANGEFSKERNEL_H
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#define __ORANGEFSKERNEL_H
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#include <linux/kernel.h>
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#include <linux/moduleparam.h>
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#include <linux/statfs.h>
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#include <linux/backing-dev.h>
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#include <linux/device.h>
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#include <linux/mpage.h>
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#include <linux/namei.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/vmalloc.h>
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#include <linux/aio.h>
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#include <linux/posix_acl.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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#include <linux/uio.h>
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#include <linux/sched/signal.h>
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#include <linux/mm.h>
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#include <linux/wait.h>
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#include <linux/dcache.h>
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#include <linux/pagemap.h>
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#include <linux/poll.h>
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#include <linux/rwsem.h>
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#include <linux/xattr.h>
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#include <linux/exportfs.h>
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#include <asm/unaligned.h>
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#include "orangefs-dev-proto.h"
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#ifdef ORANGEFS_KERNEL_DEBUG
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#define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS 10
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#else
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#define ORANGEFS_DEFAULT_OP_TIMEOUT_SECS 20
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#endif
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#define ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS 30
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#define ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS 900 /* 15 minutes */
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#define ORANGEFS_REQDEVICE_NAME "pvfs2-req"
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#define ORANGEFS_DEVREQ_MAGIC 0x20030529
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#define ORANGEFS_LINK_MAX 0x000000FF
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#define ORANGEFS_PURGE_RETRY_COUNT 0x00000005
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#define ORANGEFS_MAX_NUM_OPTIONS 0x00000004
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#define ORANGEFS_MAX_MOUNT_OPT_LEN 0x00000080
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#define ORANGEFS_MAX_FSKEY_LEN 64
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#define MAX_DEV_REQ_UPSIZE (2 * sizeof(__s32) + \
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sizeof(__u64) + sizeof(struct orangefs_upcall_s))
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#define MAX_DEV_REQ_DOWNSIZE (2 * sizeof(__s32) + \
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sizeof(__u64) + sizeof(struct orangefs_downcall_s))
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/*
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* valid orangefs kernel operation states
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*
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* unknown - op was just initialized
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* waiting - op is on request_list (upward bound)
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* inprogr - op is in progress (waiting for downcall)
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* serviced - op has matching downcall; ok
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* purged - op has to start a timer since client-core
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* exited uncleanly before servicing op
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* given up - submitter has given up waiting for it
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*/
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enum orangefs_vfs_op_states {
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OP_VFS_STATE_UNKNOWN = 0,
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OP_VFS_STATE_WAITING = 1,
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OP_VFS_STATE_INPROGR = 2,
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OP_VFS_STATE_SERVICED = 4,
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OP_VFS_STATE_PURGED = 8,
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OP_VFS_STATE_GIVEN_UP = 16,
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};
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/*
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* orangefs kernel memory related flags
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*/
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#if ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB))
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#define ORANGEFS_CACHE_CREATE_FLAGS SLAB_RED_ZONE
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#else
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#define ORANGEFS_CACHE_CREATE_FLAGS 0
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#endif /* ((defined ORANGEFS_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB)) */
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extern int orangefs_init_acl(struct inode *inode, struct inode *dir);
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extern const struct xattr_handler *orangefs_xattr_handlers[];
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extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type);
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extern int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
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/*
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* Redefine xtvec structure so that we could move helper functions out of
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* the define
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*/
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struct xtvec {
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__kernel_off_t xtv_off; /* must be off_t */
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__kernel_size_t xtv_len; /* must be size_t */
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};
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/*
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* orangefs data structures
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*/
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struct orangefs_kernel_op_s {
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enum orangefs_vfs_op_states op_state;
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__u64 tag;
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/*
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* Set uses_shared_memory to non zero if this operation uses
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* shared memory. If true, then a retry on the op must also
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* get a new shared memory buffer and re-populate it.
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* Cancels don't care - it only matters for service_operation()
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* retry logics and cancels don't go through it anymore. It
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* safely stays non-zero when we use it as slot_to_free.
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*/
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union {
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int uses_shared_memory;
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int slot_to_free;
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};
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struct orangefs_upcall_s upcall;
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struct orangefs_downcall_s downcall;
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struct completion waitq;
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spinlock_t lock;
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int attempts;
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struct list_head list;
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};
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#define set_op_state_waiting(op) ((op)->op_state = OP_VFS_STATE_WAITING)
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#define set_op_state_inprogress(op) ((op)->op_state = OP_VFS_STATE_INPROGR)
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#define set_op_state_given_up(op) ((op)->op_state = OP_VFS_STATE_GIVEN_UP)
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static inline void set_op_state_serviced(struct orangefs_kernel_op_s *op)
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{
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op->op_state = OP_VFS_STATE_SERVICED;
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complete(&op->waitq);
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}
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#define op_state_waiting(op) ((op)->op_state & OP_VFS_STATE_WAITING)
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#define op_state_in_progress(op) ((op)->op_state & OP_VFS_STATE_INPROGR)
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#define op_state_serviced(op) ((op)->op_state & OP_VFS_STATE_SERVICED)
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#define op_state_purged(op) ((op)->op_state & OP_VFS_STATE_PURGED)
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#define op_state_given_up(op) ((op)->op_state & OP_VFS_STATE_GIVEN_UP)
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#define op_is_cancel(op) ((op)->upcall.type == ORANGEFS_VFS_OP_CANCEL)
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void op_release(struct orangefs_kernel_op_s *op);
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extern void orangefs_bufmap_put(int);
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static inline void put_cancel(struct orangefs_kernel_op_s *op)
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{
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orangefs_bufmap_put(op->slot_to_free);
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op_release(op);
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}
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static inline void set_op_state_purged(struct orangefs_kernel_op_s *op)
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{
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spin_lock(&op->lock);
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if (unlikely(op_is_cancel(op))) {
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list_del_init(&op->list);
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spin_unlock(&op->lock);
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put_cancel(op);
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} else {
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op->op_state |= OP_VFS_STATE_PURGED;
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complete(&op->waitq);
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spin_unlock(&op->lock);
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}
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}
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/* per inode private orangefs info */
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struct orangefs_inode_s {
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struct orangefs_object_kref refn;
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char link_target[ORANGEFS_NAME_MAX];
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__s64 blksize;
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/*
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* Reading/Writing Extended attributes need to acquire the appropriate
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* reader/writer semaphore on the orangefs_inode_s structure.
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*/
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struct rw_semaphore xattr_sem;
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struct inode vfs_inode;
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sector_t last_failed_block_index_read;
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/*
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* State of in-memory attributes not yet flushed to disk associated
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* with this object
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*/
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unsigned long pinode_flags;
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unsigned long getattr_time;
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u32 getattr_mask;
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};
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#define P_ATIME_FLAG 0
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#define P_MTIME_FLAG 1
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#define P_CTIME_FLAG 2
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#define P_MODE_FLAG 3
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#define ClearAtimeFlag(pinode) clear_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
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#define SetAtimeFlag(pinode) set_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
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#define AtimeFlag(pinode) test_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
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#define ClearMtimeFlag(pinode) clear_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
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#define SetMtimeFlag(pinode) set_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
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#define MtimeFlag(pinode) test_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
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#define ClearCtimeFlag(pinode) clear_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
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#define SetCtimeFlag(pinode) set_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
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#define CtimeFlag(pinode) test_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
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#define ClearModeFlag(pinode) clear_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
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#define SetModeFlag(pinode) set_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
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#define ModeFlag(pinode) test_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
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/* per superblock private orangefs info */
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struct orangefs_sb_info_s {
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struct orangefs_khandle root_khandle;
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__s32 fs_id;
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int id;
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int flags;
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#define ORANGEFS_OPT_INTR 0x01
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#define ORANGEFS_OPT_LOCAL_LOCK 0x02
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char devname[ORANGEFS_MAX_SERVER_ADDR_LEN];
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struct super_block *sb;
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int mount_pending;
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int no_list;
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struct list_head list;
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};
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/*
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* structure that holds the state of any async I/O operation issued
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* through the VFS. Needed especially to handle cancellation requests
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* or even completion notification so that the VFS client-side daemon
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* can free up its vfs_request slots.
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*/
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struct orangefs_kiocb_s {
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/* the pointer to the task that initiated the AIO */
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struct task_struct *tsk;
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/* pointer to the kiocb that kicked this operation */
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struct kiocb *kiocb;
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/* buffer index that was used for the I/O */
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struct orangefs_bufmap *bufmap;
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int buffer_index;
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/* orangefs kernel operation type */
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struct orangefs_kernel_op_s *op;
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/* The user space buffers from/to which I/O is being staged */
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struct iovec *iov;
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/* number of elements in the iovector */
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unsigned long nr_segs;
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/* set to indicate the type of the operation */
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int rw;
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/* file offset */
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loff_t offset;
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/* and the count in bytes */
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size_t bytes_to_be_copied;
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ssize_t bytes_copied;
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int needs_cleanup;
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};
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struct orangefs_stats {
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unsigned long cache_hits;
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unsigned long cache_misses;
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unsigned long reads;
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unsigned long writes;
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};
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extern struct orangefs_stats orangefs_stats;
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/*
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* NOTE: See Documentation/filesystems/porting for information
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* on implementing FOO_I and properly accessing fs private data
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*/
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static inline struct orangefs_inode_s *ORANGEFS_I(struct inode *inode)
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{
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return container_of(inode, struct orangefs_inode_s, vfs_inode);
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}
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static inline struct orangefs_sb_info_s *ORANGEFS_SB(struct super_block *sb)
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{
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return (struct orangefs_sb_info_s *) sb->s_fs_info;
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}
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/* ino_t descends from "unsigned long", 8 bytes, 64 bits. */
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static inline ino_t orangefs_khandle_to_ino(struct orangefs_khandle *khandle)
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{
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union {
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unsigned char u[8];
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__u64 ino;
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} ihandle;
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ihandle.u[0] = khandle->u[0] ^ khandle->u[4];
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ihandle.u[1] = khandle->u[1] ^ khandle->u[5];
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ihandle.u[2] = khandle->u[2] ^ khandle->u[6];
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ihandle.u[3] = khandle->u[3] ^ khandle->u[7];
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ihandle.u[4] = khandle->u[12] ^ khandle->u[8];
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ihandle.u[5] = khandle->u[13] ^ khandle->u[9];
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ihandle.u[6] = khandle->u[14] ^ khandle->u[10];
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ihandle.u[7] = khandle->u[15] ^ khandle->u[11];
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return ihandle.ino;
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}
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static inline struct orangefs_khandle *get_khandle_from_ino(struct inode *inode)
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{
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return &(ORANGEFS_I(inode)->refn.khandle);
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}
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static inline ino_t get_ino_from_khandle(struct inode *inode)
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{
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struct orangefs_khandle *khandle;
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ino_t ino;
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khandle = get_khandle_from_ino(inode);
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ino = orangefs_khandle_to_ino(khandle);
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return ino;
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}
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static inline ino_t get_parent_ino_from_dentry(struct dentry *dentry)
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{
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return get_ino_from_khandle(dentry->d_parent->d_inode);
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}
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static inline int is_root_handle(struct inode *inode)
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{
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gossip_debug(GOSSIP_DCACHE_DEBUG,
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"%s: root handle: %pU, this handle: %pU:\n",
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__func__,
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&ORANGEFS_SB(inode->i_sb)->root_khandle,
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get_khandle_from_ino(inode));
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if (ORANGEFS_khandle_cmp(&(ORANGEFS_SB(inode->i_sb)->root_khandle),
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get_khandle_from_ino(inode)))
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return 0;
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else
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return 1;
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}
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static inline int match_handle(struct orangefs_khandle resp_handle,
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struct inode *inode)
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{
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gossip_debug(GOSSIP_DCACHE_DEBUG,
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"%s: one handle: %pU, another handle:%pU:\n",
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__func__,
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&resp_handle,
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get_khandle_from_ino(inode));
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if (ORANGEFS_khandle_cmp(&resp_handle, get_khandle_from_ino(inode)))
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return 0;
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else
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return 1;
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}
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/*
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* defined in orangefs-cache.c
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*/
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int op_cache_initialize(void);
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int op_cache_finalize(void);
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struct orangefs_kernel_op_s *op_alloc(__s32 type);
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void orangefs_new_tag(struct orangefs_kernel_op_s *op);
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char *get_opname_string(struct orangefs_kernel_op_s *new_op);
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int orangefs_inode_cache_initialize(void);
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int orangefs_inode_cache_finalize(void);
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/*
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* defined in orangefs-mod.c
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*/
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void purge_inprogress_ops(void);
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/*
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* defined in waitqueue.c
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*/
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void purge_waiting_ops(void);
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/*
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* defined in super.c
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*/
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extern uint64_t orangefs_features;
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struct dentry *orangefs_mount(struct file_system_type *fst,
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int flags,
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const char *devname,
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void *data);
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void orangefs_kill_sb(struct super_block *sb);
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int orangefs_remount(struct orangefs_sb_info_s *);
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int fsid_key_table_initialize(void);
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void fsid_key_table_finalize(void);
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/*
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* defined in inode.c
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*/
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__u32 convert_to_orangefs_mask(unsigned long lite_mask);
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struct inode *orangefs_new_inode(struct super_block *sb,
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struct inode *dir,
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int mode,
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dev_t dev,
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struct orangefs_object_kref *ref);
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int orangefs_setattr(struct dentry *dentry, struct iattr *iattr);
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int orangefs_getattr(const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int flags);
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int orangefs_permission(struct inode *inode, int mask);
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/*
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* defined in xattr.c
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*/
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int orangefs_setxattr(struct dentry *dentry,
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const char *name,
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const void *value,
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size_t size,
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int flags);
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ssize_t orangefs_getxattr(struct dentry *dentry,
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const char *name,
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void *buffer,
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size_t size);
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ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size);
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/*
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* defined in namei.c
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*/
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struct inode *orangefs_iget(struct super_block *sb,
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struct orangefs_object_kref *ref);
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ssize_t orangefs_inode_read(struct inode *inode,
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struct iov_iter *iter,
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loff_t *offset,
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loff_t readahead_size);
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/*
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* defined in devorangefs-req.c
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*/
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extern uint32_t orangefs_userspace_version;
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int orangefs_dev_init(void);
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void orangefs_dev_cleanup(void);
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int is_daemon_in_service(void);
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bool __is_daemon_in_service(void);
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/*
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* defined in orangefs-utils.c
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*/
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__s32 fsid_of_op(struct orangefs_kernel_op_s *op);
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int orangefs_flush_inode(struct inode *inode);
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ssize_t orangefs_inode_getxattr(struct inode *inode,
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const char *name,
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void *buffer,
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size_t size);
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int orangefs_inode_setxattr(struct inode *inode,
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const char *name,
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const void *value,
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size_t size,
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int flags);
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int orangefs_inode_getattr(struct inode *inode, int new, int bypass,
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u32 request_mask);
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int orangefs_inode_check_changed(struct inode *inode);
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int orangefs_inode_setattr(struct inode *inode, struct iattr *iattr);
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void orangefs_make_bad_inode(struct inode *inode);
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int orangefs_unmount_sb(struct super_block *sb);
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bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op);
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int orangefs_normalize_to_errno(__s32 error_code);
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extern struct mutex orangefs_request_mutex;
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extern int op_timeout_secs;
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extern int slot_timeout_secs;
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extern int orangefs_dcache_timeout_msecs;
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extern int orangefs_getattr_timeout_msecs;
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extern struct list_head orangefs_superblocks;
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extern spinlock_t orangefs_superblocks_lock;
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extern struct list_head orangefs_request_list;
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extern spinlock_t orangefs_request_list_lock;
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extern wait_queue_head_t orangefs_request_list_waitq;
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extern struct list_head *orangefs_htable_ops_in_progress;
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extern spinlock_t orangefs_htable_ops_in_progress_lock;
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extern int hash_table_size;
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extern const struct address_space_operations orangefs_address_operations;
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extern const struct inode_operations orangefs_file_inode_operations;
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extern const struct file_operations orangefs_file_operations;
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extern const struct inode_operations orangefs_symlink_inode_operations;
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extern const struct inode_operations orangefs_dir_inode_operations;
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extern const struct file_operations orangefs_dir_operations;
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extern const struct dentry_operations orangefs_dentry_operations;
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extern const struct file_operations orangefs_devreq_file_operations;
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extern wait_queue_head_t orangefs_bufmap_init_waitq;
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/*
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* misc convenience macros
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*/
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#define ORANGEFS_OP_INTERRUPTIBLE 1 /* service_operation() is interruptible */
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#define ORANGEFS_OP_PRIORITY 2 /* service_operation() is high priority */
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#define ORANGEFS_OP_CANCELLATION 4 /* this is a cancellation */
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#define ORANGEFS_OP_NO_MUTEX 8 /* don't acquire request_mutex */
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#define ORANGEFS_OP_ASYNC 16 /* Queue it, but don't wait */
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int service_operation(struct orangefs_kernel_op_s *op,
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const char *op_name,
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int flags);
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#define get_interruptible_flag(inode) \
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((ORANGEFS_SB(inode->i_sb)->flags & ORANGEFS_OPT_INTR) ? \
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ORANGEFS_OP_INTERRUPTIBLE : 0)
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#define fill_default_sys_attrs(sys_attr, type, mode) \
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do { \
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sys_attr.owner = from_kuid(&init_user_ns, current_fsuid()); \
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sys_attr.group = from_kgid(&init_user_ns, current_fsgid()); \
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sys_attr.perms = ORANGEFS_util_translate_mode(mode); \
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sys_attr.mtime = 0; \
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sys_attr.atime = 0; \
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sys_attr.ctime = 0; \
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sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE; \
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} while (0)
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static inline void orangefs_i_size_write(struct inode *inode, loff_t i_size)
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{
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#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
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inode_lock(inode);
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#endif
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i_size_write(inode, i_size);
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#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
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inode_unlock(inode);
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#endif
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}
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static inline void orangefs_set_timeout(struct dentry *dentry)
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{
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unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000;
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dentry->d_fsdata = (void *) time;
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}
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#endif /* __ORANGEFSKERNEL_H */
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