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ext4: add mask of ext4 flags to swap

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The reason is that while swapping two inode, we swap the flags too.
Some flags such as EXT4_JOURNAL_DATA_FL can really confuse the things
since we're not resetting the address operations structure.  The
simplest way to keep things sane is to restrict the flags that can be
swapped.

Signed-off-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
This commit is contained in:
yangerkun
2019-02-11 00:35:06 -05:00
committed by Theodore Ts'o
parent aa507b5faf
commit abdc644e8c
2 changed files with 8 additions and 1 deletions
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6
fs/ext4/ioctl.c
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@@ -63,6 +63,7 @@ static void swap_inode_data(struct inode *inode1, struct inode *inode2)
loff_t isize;
struct ext4_inode_info *ei1;
struct ext4_inode_info *ei2;
unsigned long tmp;
ei1 = EXT4_I(inode1);
ei2 = EXT4_I(inode2);
@@ -72,7 +73,10 @@ static void swap_inode_data(struct inode *inode1, struct inode *inode2)
swap(inode1->i_mtime, inode2->i_mtime);
memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
swap(ei1->i_flags, ei2->i_flags);
tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
(ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
swap(ei1->i_disksize, ei2->i_disksize);
ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);