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authorMiao Xie <miaox@cn.fujitsu.com>2011-12-14 20:12:01 -0500
committerChris Mason <chris.mason@oracle.com>2011-12-15 10:50:35 -0500
commitf4a2f4c548296168832ad4ab7e7f7b0cd0bf1214 (patch)
tree10df3e81cc6a10253bb007858ee862a91c596335
parent5dbc8fca8ef5d719014f22345d990e957dcfc692 (diff)
Btrfs: fix wrong i_size when truncating a file to a larger size
Btrfsck report error 100 after the 83th case of xfstests was run, it means the i_size of the file is wrong. The reason of this bug is that: Btrfs increased i_size of the file at the beginning, but it failed to expand the file, and failed to update the i_size to the old size because there is no enough space in the file system, so we found a wrong i_size. This patch fixes this bug by updating the i_size just when we pass the file expanding and get enough space to update i-node. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/inode.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c5ccec23984c..4bbceb928aff 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3370,6 +3370,8 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
static int btrfs_setsize(struct inode *inode, loff_t newsize)
{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_trans_handle *trans;
loff_t oldsize = i_size_read(inode);
int ret;
@@ -3377,16 +3379,20 @@ static int btrfs_setsize(struct inode *inode, loff_t newsize)
return 0;
if (newsize > oldsize) {
- i_size_write(inode, newsize);
- btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
truncate_pagecache(inode, oldsize, newsize);
ret = btrfs_cont_expand(inode, oldsize, newsize);
- if (ret) {
- btrfs_setsize(inode, oldsize);
+ if (ret)
return ret;
- }
- mark_inode_dirty(inode);
+ trans = btrfs_start_transaction(root, 1);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
+
+ i_size_write(inode, newsize);
+ btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
+ ret = btrfs_update_inode(trans, root, inode);
+
+ btrfs_end_transaction_throttle(trans, root);
} else {
/*