fs/xfs/linux-2.6/xfs_vfs.h

   1 /*
   2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_VFS_H__
  19 #define __XFS_VFS_H__
  20
  21 #include <linux/vfs.h>
  22 #include "xfs_fs.h"
  23
  24 struct bhv_vfs;
  25 struct inode;
  26
  27 struct fid;
  28 struct cred;
  29 struct seq_file;
  30 struct super_block;
  31 struct xfs_inode;
  32 struct xfs_mount;
  33 struct xfs_mount_args;
  34
  35 typedef struct kstatfs  bhv_statvfs_t;
  36
  37 typedef struct bhv_vfs_sync_work {
  38         struct list_head        w_list;
  39         struct bhv_vfs          *w_vfs;
  40         void                    *w_data;        /* syncer routine argument */
  41         void                    (*w_syncer)(struct bhv_vfs *, void *);
  42 } bhv_vfs_sync_work_t;
  43
  44 typedef struct bhv_vfs {
  45         struct xfs_mount        *vfs_mount;
  46         struct super_block      *vfs_super;     /* generic superblock pointer */
  47         struct task_struct      *vfs_sync_task; /* generalised sync thread */
  48         bhv_vfs_sync_work_t     vfs_sync_work;  /* work item for VFS_SYNC */
  49         struct list_head        vfs_sync_list;  /* sync thread work item list */
  50         spinlock_t              vfs_sync_lock;  /* work item list lock */
  51         int                     vfs_sync_seq;   /* sync thread generation no. */
  52         wait_queue_head_t       vfs_wait_single_sync_task;
  53 } bhv_vfs_t;
  54
  55 #define SYNC_ATTR               0x0001  /* sync attributes */
  56 #define SYNC_CLOSE              0x0002  /* close file system down */
  57 #define SYNC_DELWRI             0x0004  /* look at delayed writes */
  58 #define SYNC_WAIT               0x0008  /* wait for i/o to complete */
  59 #define SYNC_BDFLUSH            0x0010  /* BDFLUSH is calling -- don't block */
  60 #define SYNC_FSDATA             0x0020  /* flush fs data (e.g. superblocks) */
  61 #define SYNC_REFCACHE           0x0040  /* prune some of the nfs ref cache */
  62 #define SYNC_REMOUNT            0x0080  /* remount readonly, no dummy LRs */
  63 #define SYNC_IOWAIT             0x0100  /* wait for all I/O to complete */
  64 #define SYNC_SUPER              0x0200  /* flush superblock to disk */
  65
  66 /*
  67  * When remounting a filesystem read-only or freezing the filesystem,
  68  * we have two phases to execute. This first phase is syncing the data
  69  * before we quiesce the fielsystem, and the second is flushing all the
  70  * inodes out after we've waited for all the transactions created by
  71  * the first phase to complete. The second phase uses SYNC_INODE_QUIESCE
  72  * to ensure that the inodes are written to their location on disk
  73  * rather than just existing in transactions in the log. This means
  74  * after a quiesce there is no log replay required to write the inodes
  75  * to disk (this is the main difference between a sync and a quiesce).
  76  */
  77 #define SYNC_DATA_QUIESCE       (SYNC_DELWRI|SYNC_FSDATA|SYNC_WAIT|SYNC_IOWAIT)
  78 #define SYNC_INODE_QUIESCE      (SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT)
  79
  80 #define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
  81 #define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
  82 #define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
  83 #define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
  84 #define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
  85 #define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
  86
  87 #define vfs_test_for_freeze(vfs)        ((vfs)->vfs_super->s_frozen)
  88 #define vfs_wait_for_freeze(vfs,l)      vfs_check_frozen((vfs)->vfs_super, (l))
  89
  90 extern bhv_vfs_t *vfs_allocate(struct super_block *);
  91 extern bhv_vfs_t *vfs_from_sb(struct super_block *);
  92 extern void vfs_deallocate(bhv_vfs_t *);
  93
  94 #endif  /* __XFS_VFS_H__ */