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| author | Tony Luck <tony.luck@intel.com> | 2005-05-17 15:53:14 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-05-17 15:53:14 -0700 |
| commit | 325a479c4c110db278ef3361460a48c4093252cc (patch) | |
| tree | bcfbf4d0647d9442045639a5c19da59d55190e81 /Documentation/filesystems/Locking | |
| parent | ebcc80c1b6629a445f7471cc1ddb48faf8a84e70 (diff) | |
| parent | 7f9eaedf894dbaa08c157832e9a6c9c03ffed1ed (diff) | |
Merge with temp tree to get David's gdb inferior calls patch
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 a934baeeb33..1045da582b9 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, |