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Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/porting | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index 07a32b42cf9c..266d2059b9b8 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting | |||
| @@ -385,3 +385,12 @@ Documentation/filesystems/vfs.txt for more details. | |||
| 385 | on many or all directory inodes on the way down a path walk (to check for | 385 | on many or all directory inodes on the way down a path walk (to check for |
| 386 | exec permission). These must now be rcu-walk aware (flags & IPERM_RCU). See | 386 | exec permission). These must now be rcu-walk aware (flags & IPERM_RCU). See |
| 387 | Documentation/filesystems/vfs.txt for more details. | 387 | Documentation/filesystems/vfs.txt for more details. |
| 388 | |||
| 389 | -- | ||
| 390 | [mandatory] | ||
| 391 | In ->fallocate() you must check the mode option passed in. If your | ||
| 392 | filesystem does not support hole punching (deallocating space in the middle of a | ||
| 393 | file) you must return -EOPNOTSUPP if FALLOC_FL_PUNCH_HOLE is set in mode. | ||
| 394 | Currently you can only have FALLOC_FL_PUNCH_HOLE with FALLOC_FL_KEEP_SIZE set, | ||
| 395 | so the i_size should not change when hole punching, even when puching the end of | ||
| 396 | a file off. | ||