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Btrfs: Take the extent lock before dropping the delalloc bits 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-02-19 12:55:05 -05:00
parent 5e591a0703
commit d99cb30a11
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/file.c
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@ -765,9 +765,13 @@ static int prepare_pages(struct btrfs_root *root, struct file *file,
if (start_pos < inode->i_size) { if (start_pos < inode->i_size) {
u64 last_pos; u64 last_pos;
last_pos = (index + num_pages) << PAGE_CACHE_SHIFT; last_pos = (index + num_pages) << PAGE_CACHE_SHIFT;
lock_extent(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, GFP_NOFS);
clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos, clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC, last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC,
GFP_NOFS); GFP_NOFS);
unlock_extent(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, GFP_NOFS);
} }
return 0; return 0;
} }