diff options
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 7737bfd03cf8..ea271f2d3954 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt | |||
| @@ -617,6 +617,11 @@ struct address_space_operations { | |||
| 617 | In this case the prepare_write will be retried one the lock is | 617 | In this case the prepare_write will be retried one the lock is |
| 618 | regained. | 618 | regained. |
| 619 | 619 | ||
| 620 | Note: the page _must not_ be marked uptodate in this function | ||
| 621 | (or anywhere else) unless it actually is uptodate right now. As | ||
| 622 | soon as a page is marked uptodate, it is possible for a concurrent | ||
| 623 | read(2) to copy it to userspace. | ||
| 624 | |||
| 620 | commit_write: If prepare_write succeeds, new data will be copied | 625 | commit_write: If prepare_write succeeds, new data will be copied |
| 621 | into the page and then commit_write will be called. It will | 626 | into the page and then commit_write will be called. It will |
| 622 | typically update the size of the file (if appropriate) and | 627 | typically update the size of the file (if appropriate) and |