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ext4: update mtime in ext4_punch_hole even if no blocks are released 

Currently in ext4_punch_hole we're going to skip the mtime update if
there are no actual blocks to release. However we've actually modified
the file by zeroing the partial block so the mtime should be updated.

Moreover the sync and datasync handling is skipped as well, which is
also wrong. Fix it.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Joe Habermann <joe.habermann@quantum.com>
Cc: <stable@vger.kernel.org>
This commit is contained in:
Lukas Czerner 2018-05-13 19:28:35 -04:00 committed by Theodore Ts'o
parent 6390d33bf5
commit eee597ac93
1 changed files with 18 additions and 18 deletions
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6
fs/ext4/inode.c
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@ -4298,9 +4298,8 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
EXT4_BLOCK_SIZE_BITS(sb);
stop_block = (offset + length) >> EXT4_BLOCK_SIZE_BITS(sb);
/* If there are no blocks to remove, return now */
if (first_block >= stop_block)
goto out_stop;
/* If there are blocks to remove, do it */
if (stop_block > first_block) {
down_write(&EXT4_I(inode)->i_data_sem);
ext4_discard_preallocations(inode);
@ -4320,6 +4319,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
stop_block);
up_write(&EXT4_I(inode)->i_data_sem);
}
if (IS_SYNC(inode))
ext4_handle_sync(handle);