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| author | Liu Bo <bo.li.liu@oracle.com> | 2013-04-16 13:20:28 +0400 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-05-06 23:54:55 +0400 |
| commit | 0abd5b17249ea5ca49a3a9ad4285cac3dfa8c30b (patch) | |
| tree | 26b1399cc7b83ddabd2427d283a5a39a1dd878c5 /fs/btrfs/ioctl.c | |
| parent | 3c59ccd32abb8f636b1573533d3e77972e80a9c9 (diff) | |
| download | linux-0abd5b17249ea5ca49a3a9ad4285cac3dfa8c30b.tar.xz | |
Btrfs: return error when we specify wrong start to defrag
We need such a sanity check for wrong start when we defrag a file, otherwise,
even with a wrong start that's larger than file size, we can end up changing
not only inode's force compress flag but also FS's incompat flags.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/ioctl.c')
| -rw-r--r-- | fs/btrfs/ioctl.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index ace88c1df540..a74edc797531 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1154,8 +1154,11 @@ int btrfs_defrag_file(struct inode *inode, struct file *file, u64 new_align = ~((u64)128 * 1024 - 1); struct page **pages = NULL; - if (extent_thresh == 0) - extent_thresh = 256 * 1024; + if (isize == 0) + return 0; + + if (range->start >= isize) + return -EINVAL; if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { if (range->compress_type > BTRFS_COMPRESS_TYPES) @@ -1164,8 +1167,8 @@ int btrfs_defrag_file(struct inode *inode, struct file *file, compress_type = range->compress_type; } - if (isize == 0) - return 0; + if (extent_thresh == 0) + extent_thresh = 256 * 1024; /* * if we were not given a file, allocate a readahead |