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ext4: keep existing extra fields when inode expands 

ext4_expand_extra_isize() should clear only space between old and new
size.

Fixes: 6dd4ee7cab # v2.6.23
Cc: stable@vger.kernel.org
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Konstantin Khlebnikov 2017-05-21 22:36:23 -04:00 committed by Theodore Ts'o
parent 9651e6b2e2
commit 887a973061
1 changed files with 3 additions and 2 deletions
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5
fs/ext4/inode.c
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@ -5637,8 +5637,9 @@ static int ext4_expand_extra_isize(struct inode *inode,
/* No extended attributes present */
if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) {
memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE, 0,
new_extra_isize);
memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE +
EXT4_I(inode)->i_extra_isize, 0,
new_extra_isize - EXT4_I(inode)->i_extra_isize);
EXT4_I(inode)->i_extra_isize = new_extra_isize;
return 0;
}