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| author | David Woodhouse <dwmw2@shinybook.infradead.org> | 2005-05-03 08:14:09 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@shinybook.infradead.org> | 2005-05-03 08:14:09 +0100 |
| commit | 27b030d58c8e72fc7a95187a791bd9406e350f02 (patch) | |
| tree | ab3bab7f39a5ce5bab65578a7e08fa4dfdeb198c /Documentation/filesystems/Locking | |
| parent | 79d20b14a0d651f15b0ef9a22b6cf12d284a6d38 (diff) | |
| parent | 6628465e33ca694bd8fd5c3cf4eb7ff9177bc694 (diff) | |
| download | talos-obmc-linux-27b030d58c8e72fc7a95187a791bd9406e350f02.tar.gz talos-obmc-linux-27b030d58c8e72fc7a95187a791bd9406e350f02.zip | |
Merge with master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
Diffstat (limited to 'Documentation/filesystems/Locking')
| -rw-r--r-- | Documentation/filesystems/Locking | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index a934baeeb33a..1045da582b9b 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -219,8 +219,12 @@ This may also be done to avoid internal deadlocks, but rarely. If the filesytem is called for sync then it must wait on any in-progress I/O and then start new I/O. -The filesystem should unlock the page synchronously, before returning -to the caller. +The filesystem should unlock the page synchronously, before returning to the +caller, unless ->writepage() returns special WRITEPAGE_ACTIVATE +value. WRITEPAGE_ACTIVATE means that page cannot really be written out +currently, and VM should stop calling ->writepage() on this page for some +time. VM does this by moving page to the head of the active list, hence the +name. Unless the filesystem is going to redirty_page_for_writepage(), unlock the page and return zero, writepage *must* run set_page_writeback() against the page, |
