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| author | Miao Xie <miaox@cn.fujitsu.com> | 2011-12-15 01:12:01 (GMT) |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-12-15 15:50:35 (GMT) |
| commit | f4a2f4c548296168832ad4ab7e7f7b0cd0bf1214 (patch) | |
| tree | 10df3e81cc6a10253bb007858ee862a91c596335 | |
| parent | 5dbc8fca8ef5d719014f22345d990e957dcfc692 (diff) | |
| download | linux-fsl-qoriq-f4a2f4c548296168832ad4ab7e7f7b0cd0bf1214.tar.xz | |
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.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index c5ccec2..4bbceb9 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 { /* |