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| author | Jan Kara <jack@suse.cz> | 2016-05-11 11:58:49 +0200 |
|---|---|---|
| committer | Vishal Verma <vishal.l.verma@intel.com> | 2016-05-17 00:44:07 -0600 |
| commit | 86b0624e42d03a424e9571b8591d191c436f9af1 (patch) | |
| tree | a00a6ccf33d6f1880ce18f455d8259dc3dc1a326 /fs/ext2 | |
| parent | 9b6cd5f76d60b563d75e55e432e03ed134761432 (diff) | |
| download | linux-86b0624e42d03a424e9571b8591d191c436f9af1.tar.gz linux-86b0624e42d03a424e9571b8591d191c436f9af1.tar.bz2 linux-86b0624e42d03a424e9571b8591d191c436f9af1.zip | |
ext2: Avoid DAX zeroing to corrupt data
Currently ext2 zeroes any data blocks allocated for DAX inode however it
still returns them as BH_New. Thus DAX code zeroes them again in
dax_insert_mapping() which can possibly overwrite the data that has been
already stored to those blocks by a racing dax_io(). Avoid marking
pre-zeroed buffers as new.
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Diffstat (limited to 'fs/ext2')
| -rw-r--r-- | fs/ext2/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index 038d0ed5f565..9a14af3b1a69 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -745,11 +745,11 @@ static int ext2_get_blocks(struct inode *inode, mutex_unlock(&ei->truncate_mutex); goto cleanup; } - } + } else + set_buffer_new(bh_result); ext2_splice_branch(inode, iblock, partial, indirect_blks, count); mutex_unlock(&ei->truncate_mutex); - set_buffer_new(bh_result); got_it: map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key)); if (count > blocks_to_boundary) |