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Btrfs: Make sure pages are dirty before doing delalloc for them

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This adds a PageDirty check to the writeback path that locks pages
for delalloc.  If a page wasn't dirty at this point, it is in the
process of being truncated away.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-11-10 07:31:30 -05:00
parent 5b7c3fcc46
commit f2b1c41cf9
1 changed files with 2 additions and 1 deletions
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fs/btrfs/extent_io.c
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@ -1205,7 +1205,8 @@ static noinline int lock_delalloc_pages(struct inode *inode,
*/ */
if (pages[i] != locked_page) { if (pages[i] != locked_page) {
lock_page(pages[i]); lock_page(pages[i]);
if (pages[i]->mapping != inode->i_mapping) { if (!PageDirty(pages[i]) ||
pages[i]->mapping != inode->i_mapping) {
ret = -EAGAIN; ret = -EAGAIN;
unlock_page(pages[i]); unlock_page(pages[i]);
page_cache_release(pages[i]); page_cache_release(pages[i]);