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Btrfs: Properly clear dirty and delalloc extent bits while preparing the file for write 

Yan Zheng noticed that we don't clear the extent state tree dirty and delalloc
bits when we clear the dirty bits on the page during file write.

This leads to csum errors later on.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-02-19 11:29:24 -05:00
parent 952fccac50
commit 0762704b19
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/file.c
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@ -762,6 +762,13 @@ static int prepare_pages(struct btrfs_root *root, struct file *file,
set_page_extent_mapped(pages[i]);
WARN_ON(!PageLocked(pages[i]));
}
if (start_pos < inode->i_size) {
u64 last_pos;
last_pos = (index + num_pages) << PAGE_CACHE_SHIFT;
clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC,
GFP_NOFS);
}
return 0;
}