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| author | Chris Mason <chris.mason@oracle.com> | 2008-07-17 12:53:51 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:04 -0400 |
| commit | 247e743cbe6e655768c3679f84821e03c1577902 (patch) | |
| tree | edc2b27284365f019859a936885bd100960eb659 /fs/btrfs/extent_io.c | |
| parent | e6dcd2dc9c489108648e2ed543315dd134d50a9a (diff) | |
Btrfs: Use async helpers to deal with pages that have been improperly dirtied
Higher layers sometimes call set_page_dirty without asking the filesystem
to help. This causes many problems for the data=ordered and cow code.
This commit detects pages that haven't been properly setup for IO and
kicks off an async helper to deal with them.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.c')
| -rw-r--r-- | fs/btrfs/extent_io.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 3f82a6e9ca4f..feff16cb9b40 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2050,6 +2050,16 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, lock_extent(tree, start, page_end, GFP_NOFS); unlock_start = start; + if (tree->ops && tree->ops->writepage_start_hook) { + ret = tree->ops->writepage_start_hook(page, start, page_end); + if (ret == -EAGAIN) { + unlock_extent(tree, start, page_end, GFP_NOFS); + redirty_page_for_writepage(wbc, page); + unlock_page(page); + return 0; + } + } + end = page_end; if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) { printk("found delalloc bits after lock_extent\n"); |