tree a0f16b854d4271ef5a9d6eaa816293fa316a3921
parent 9083977dabf3833298ddcd40dee28687f1e6b483
author Chao Yu <yuchao0@huawei.com> 1550160505 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1551844686 -0800

f2fs: fix to check inline_xattr_size boundary correctly

We use below condition to check inline_xattr_size boundary:

	if (!F2FS_OPTION(sbi).inline_xattr_size ||
		F2FS_OPTION(sbi).inline_xattr_size >=
				DEF_ADDRS_PER_INODE -
				F2FS_TOTAL_EXTRA_ATTR_SIZE -
				DEF_INLINE_RESERVED_SIZE -
				DEF_MIN_INLINE_SIZE)

There is there problems in that check:
- we should allow inline_xattr_size equaling to min size of inline
{data,dentry} area.
- F2FS_TOTAL_EXTRA_ATTR_SIZE and inline_xattr_size are based on
different size unit, previous one is 4 bytes, latter one is 1 bytes.
- DEF_MIN_INLINE_SIZE only indicate min size of inline data area,
however, we need to consider min size of inline dentry area as well,
minimal inline dentry should at least contain two entries: '.' and
'..', so that min inline_dentry size is 40 bytes.

.bitmap		1 * 1 = 1
.reserved	1 * 1 = 1
.dentry		11 * 2 = 22
.filename	8 * 2 = 16
total		40

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>