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Commit 837711f8 authored by Coly Li's avatar Coly Li Committed by Joel Becker
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ocfs2: return f_fsid info in ocfs2_statfs() 



Currently the f_fsid of struct kstatfs returned from ocfs2_statfs() is
undefined (vfs layer fills in 0 as default). Since in some conditions,
f_fsid value might be used in a (f_fsid, ino) pair to uniquely identify
a file, ocfs2 should return a unique defined f_fsid value from
ocfs2_statfs().

Because uuid_str is the same on big or litlle endian machine, it's
endian consistent to use osb->uuid_str to generate f_fsid value.

Signed-off-by: default avatarColy Li <coly.li@suse.de>
Cc: Sunil Mushran <sunil.mushran@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
parent 2f48d593

fs/ocfs2/super.c

+4 −0
Original line number Original line Diff line number Diff line
@@ -1647,6 +1647,10 @@ static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 
	buf->f_bavail = buf->f_bfree;

	buf->f_bavail = buf->f_bfree;

	buf->f_files = numbits;

	buf->f_files = numbits;

	buf->f_ffree = freebits;

	buf->f_ffree = freebits;

	buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)

				& 0xFFFFFFFFUL;

	buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,

				OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;





	brelse(bh);

	brelse(bh);