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| author | Akira Fujita <a-fujita@rs.jp.nec.com> | 2010-03-04 08:31:06 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-03-04 08:31:06 +0300 |
| commit | 5fd5249aa36fad98c9fd5edced352939e54f9324 (patch) | |
| tree | ee8add19d98cc2fc47133b3346b5e55ecc68478e /fs/ext4 | |
| parent | 731eb1a03a8445cde2cb23ecfb3580c6fa7bb690 (diff) | |
| download | linux-5fd5249aa36fad98c9fd5edced352939e54f9324.tar.xz | |
ext4: Fix insertion point of extent in mext_insert_across_blocks()
If the leaf node has 2 extent space or fewer and EXT4_IOC_MOVE_EXT
ioctl is called with the file offset where after the 2nd extent
covers, mext_insert_across_blocks() always tries to insert extent into
the first extent. As a result, the file gets corrupted because of
wrong extent order. The patch fixes this problem.
Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/move_extent.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c index 1654eb862d74..9eca1c0ec546 100644 --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -252,6 +252,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, } o_start->ee_len = start_ext->ee_len; + eblock = le32_to_cpu(start_ext->ee_block); new_flag = 1; } else if (start_ext->ee_len && new_ext->ee_len && @@ -262,6 +263,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, * orig |------------------------------| */ o_start->ee_len = start_ext->ee_len; + eblock = le32_to_cpu(start_ext->ee_block); new_flag = 1; } else if (!start_ext->ee_len && new_ext->ee_len && @@ -502,6 +504,7 @@ mext_leaf_block(handle_t *handle, struct inode *orig_inode, le32_to_cpu(oext->ee_block) + oext_alen) { start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) - le32_to_cpu(oext->ee_block)); + start_ext.ee_block = oext->ee_block; copy_extent_status(oext, &start_ext); } else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) { prev_ext = oext - 1; @@ -515,6 +518,7 @@ mext_leaf_block(handle_t *handle, struct inode *orig_inode, start_ext.ee_len = cpu_to_le16( ext4_ext_get_actual_len(prev_ext) + new_ext_alen); + start_ext.ee_block = oext->ee_block; copy_extent_status(prev_ext, &start_ext); new_ext.ee_len = 0; } |