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| author | Li Zefan <lizf@cn.fujitsu.com> | 2011-09-11 18:52:25 +0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-09-11 18:52:25 +0400 |
| commit | d72c0842ff0e71342857723bb65f35b71f57b264 (patch) | |
| tree | ab0e5037f19fd279fb57b3b653a53d5c92f32e73 | |
| parent | 4815053aba7f2304055745df820cd74a39fdaab2 (diff) | |
| download | linux-d72c0842ff0e71342857723bb65f35b71f57b264.tar.xz | |
Btrfs: calc file extent num_bytes correctly in file clone
num_bytes should be 4096 not 12288.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/ioctl.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index b3d249d6eba7..028a4b8c12cd 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2333,14 +2333,21 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, if (type == BTRFS_FILE_EXTENT_REG || type == BTRFS_FILE_EXTENT_PREALLOC) { + /* + * a | --- range to clone ---| b + * | ------------- extent ------------- | + */ + + /* substract range b */ + if (key.offset + datal > off + len) + datal = off + len - key.offset; + + /* substract range a */ if (off > key.offset) { datao += off - key.offset; datal -= off - key.offset; } - if (key.offset + datal > off + len) - datal = off + len - key.offset; - ret = btrfs_drop_extents(trans, inode, new_key.offset, new_key.offset + datal, |