fs/xfs/xfs_dmapi.h

   1 /*
   2  * Copyright (c) 2000-2005 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_DMAPI_H__
  19 #define __XFS_DMAPI_H__
  20
  21 /*      Values used to define the on-disk version of dm_attrname_t. All
  22  *      on-disk attribute names start with the 8-byte string "SGI_DMI_".
  23  *
  24  *      In the on-disk inode, DMAPI attribute names consist of the user-provided
  25  *      name with the DMATTR_PREFIXSTRING pre-pended.  This string must NEVER be
  26  *      changed.
  27  */
  28
  29 #define DMATTR_PREFIXLEN        8
  30 #define DMATTR_PREFIXSTRING     "SGI_DMI_"
  31
  32 typedef enum {
  33         DM_EVENT_INVALID        = -1,
  34         DM_EVENT_CANCEL         = 0,            /* not supported */
  35         DM_EVENT_MOUNT          = 1,
  36         DM_EVENT_PREUNMOUNT     = 2,
  37         DM_EVENT_UNMOUNT        = 3,
  38         DM_EVENT_DEBUT          = 4,            /* not supported */
  39         DM_EVENT_CREATE         = 5,
  40         DM_EVENT_CLOSE          = 6,            /* not supported */
  41         DM_EVENT_POSTCREATE     = 7,
  42         DM_EVENT_REMOVE         = 8,
  43         DM_EVENT_POSTREMOVE     = 9,
  44         DM_EVENT_RENAME         = 10,
  45         DM_EVENT_POSTRENAME     = 11,
  46         DM_EVENT_LINK           = 12,
  47         DM_EVENT_POSTLINK       = 13,
  48         DM_EVENT_SYMLINK        = 14,
  49         DM_EVENT_POSTSYMLINK    = 15,
  50         DM_EVENT_READ           = 16,
  51         DM_EVENT_WRITE          = 17,
  52         DM_EVENT_TRUNCATE       = 18,
  53         DM_EVENT_ATTRIBUTE      = 19,
  54         DM_EVENT_DESTROY        = 20,
  55         DM_EVENT_NOSPACE        = 21,
  56         DM_EVENT_USER           = 22,
  57         DM_EVENT_MAX            = 23
  58 } dm_eventtype_t;
  59 #define HAVE_DM_EVENTTYPE_T
  60
  61 typedef enum {
  62         DM_RIGHT_NULL,
  63         DM_RIGHT_SHARED,
  64         DM_RIGHT_EXCL
  65 } dm_right_t;
  66 #define HAVE_DM_RIGHT_T
  67
  68 /* Defines for determining if an event message should be sent. */
  69 #define DM_EVENT_ENABLED(vfsp, ip, event) ( \
  70         unlikely ((vfsp)->vfs_flag & VFS_DMI) && \
  71                 ( ((ip)->i_d.di_dmevmask & (1 << event)) || \
  72                   ((ip)->i_mount->m_dmevmask & (1 << event)) ) \
  73         )
  74
  75 #define DM_EVENT_ENABLED_IO(vfsp, io, event) ( \
  76         unlikely ((vfsp)->vfs_flag & VFS_DMI) && \
  77                 ( ((io)->io_dmevmask & (1 << event)) || \
  78                   ((io)->io_mount->m_dmevmask & (1 << event)) ) \
  79         )
  80
  81 #define DM_XFS_VALID_FS_EVENTS          ( \
  82         (1 << DM_EVENT_PREUNMOUNT)      | \
  83         (1 << DM_EVENT_UNMOUNT)         | \
  84         (1 << DM_EVENT_NOSPACE)         | \
  85         (1 << DM_EVENT_DEBUT)           | \
  86         (1 << DM_EVENT_CREATE)          | \
  87         (1 << DM_EVENT_POSTCREATE)      | \
  88         (1 << DM_EVENT_REMOVE)          | \
  89         (1 << DM_EVENT_POSTREMOVE)      | \
  90         (1 << DM_EVENT_RENAME)          | \
  91         (1 << DM_EVENT_POSTRENAME)      | \
  92         (1 << DM_EVENT_LINK)            | \
  93         (1 << DM_EVENT_POSTLINK)        | \
  94         (1 << DM_EVENT_SYMLINK)         | \
  95         (1 << DM_EVENT_POSTSYMLINK)     | \
  96         (1 << DM_EVENT_ATTRIBUTE)       | \
  97         (1 << DM_EVENT_DESTROY)         )
  98
  99 /* Events valid in dm_set_eventlist() when called with a file handle for
 100    a regular file or a symlink.  These events are persistent.
 101 */
 102
 103 #define DM_XFS_VALID_FILE_EVENTS        ( \
 104         (1 << DM_EVENT_ATTRIBUTE)       | \
 105         (1 << DM_EVENT_DESTROY)         )
 106
 107 /* Events valid in dm_set_eventlist() when called with a file handle for
 108    a directory.  These events are persistent.
 109 */
 110
 111 #define DM_XFS_VALID_DIRECTORY_EVENTS   ( \
 112         (1 << DM_EVENT_CREATE)          | \
 113         (1 << DM_EVENT_POSTCREATE)      | \
 114         (1 << DM_EVENT_REMOVE)          | \
 115         (1 << DM_EVENT_POSTREMOVE)      | \
 116         (1 << DM_EVENT_RENAME)          | \
 117         (1 << DM_EVENT_POSTRENAME)      | \
 118         (1 << DM_EVENT_LINK)            | \
 119         (1 << DM_EVENT_POSTLINK)        | \
 120         (1 << DM_EVENT_SYMLINK)         | \
 121         (1 << DM_EVENT_POSTSYMLINK)     | \
 122         (1 << DM_EVENT_ATTRIBUTE)       | \
 123         (1 << DM_EVENT_DESTROY)         )
 124
 125 /* Events supported by the XFS filesystem. */
 126 #define DM_XFS_SUPPORTED_EVENTS         ( \
 127         (1 << DM_EVENT_MOUNT)           | \
 128         (1 << DM_EVENT_PREUNMOUNT)      | \
 129         (1 << DM_EVENT_UNMOUNT)         | \
 130         (1 << DM_EVENT_NOSPACE)         | \
 131         (1 << DM_EVENT_CREATE)          | \
 132         (1 << DM_EVENT_POSTCREATE)      | \
 133         (1 << DM_EVENT_REMOVE)          | \
 134         (1 << DM_EVENT_POSTREMOVE)      | \
 135         (1 << DM_EVENT_RENAME)          | \
 136         (1 << DM_EVENT_POSTRENAME)      | \
 137         (1 << DM_EVENT_LINK)            | \
 138         (1 << DM_EVENT_POSTLINK)        | \
 139         (1 << DM_EVENT_SYMLINK)         | \
 140         (1 << DM_EVENT_POSTSYMLINK)     | \
 141         (1 << DM_EVENT_READ)            | \
 142         (1 << DM_EVENT_WRITE)           | \
 143         (1 << DM_EVENT_TRUNCATE)        | \
 144         (1 << DM_EVENT_ATTRIBUTE)       | \
 145         (1 << DM_EVENT_DESTROY)         )
 146
 147
 148 /*
 149  *      Definitions used for the flags field on dm_send_*_event().
 150  */
 151
 152 #define DM_FLAGS_NDELAY         0x001   /* return EAGAIN after dm_pending() */
 153 #define DM_FLAGS_UNWANTED       0x002   /* event not in fsys dm_eventset_t */
 154 #define DM_FLAGS_ISEM           0x004   /* thread holds i_sem */
 155 #define DM_FLAGS_IALLOCSEM_RD   0x010   /* thread holds i_alloc_sem rd */
 156 #define DM_FLAGS_IALLOCSEM_WR   0x020   /* thread holds i_alloc_sem wr */
 157
 158 /*
 159  *      Based on IO_ISDIRECT, decide which i_ flag is set.
 160  */
 161 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
 162 #define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
 163                               DM_FLAGS_ISEM : 0)
 164 #define DM_SEM_FLAG_WR  (DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_ISEM)
 165 #endif
 166
 167 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)) && \
 168     (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,22))
 169 #define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
 170                               DM_FLAGS_IALLOCSEM_RD : DM_FLAGS_ISEM)
 171 #define DM_SEM_FLAG_WR  (DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_ISEM)
 172 #endif
 173
 174 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,21)
 175 #define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
 176                               0 : DM_FLAGS_ISEM)
 177 #define DM_SEM_FLAG_WR  (DM_FLAGS_ISEM)
 178 #endif
 179
 180
 181 /*
 182  *      Macros to turn caller specified delay/block flags into
 183  *      dm_send_xxxx_event flag DM_FLAGS_NDELAY.
 184  */
 185
 186 #define FILP_DELAY_FLAG(filp) ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) ? \
 187                         DM_FLAGS_NDELAY : 0)
 188 #define AT_DELAY_FLAG(f) ((f&ATTR_NONBLOCK) ? DM_FLAGS_NDELAY : 0)
 189
 190
 191 extern struct bhv_vfsops xfs_dmops;
 192
 193 #ifdef CONFIG_XFS_DMAPI
 194 void xfs_dm_init(struct file_system_type *);
 195 void xfs_dm_exit(struct file_system_type *);
 196 #define XFS_DM_INIT(fstype)     xfs_dm_init(fstype)
 197 #define XFS_DM_EXIT(fstype)     xfs_dm_exit(fstype)
 198 #else
 199 #define XFS_DM_INIT(fstype)
 200 #define XFS_DM_EXIT(fstype)
 201 #endif
 202
 203 #endif  /* __XFS_DMAPI_H__ */