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| author | Amir Goldstein <amir73il@gmail.com> | 2021-03-22 18:39:43 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2021-04-19 16:03:15 +0200 |
| commit | 9591c3a34f7722bd77f42c98d76fd5a5bad465f0 (patch) | |
| tree | 44001867b11da3de1fa029e50ab636ea381c0c7a /fs/ext2 | |
| parent | fanotify_user: use upper_32_bits() to verify mask (diff) | |
| download | linux-9591c3a34f7722bd77f42c98d76fd5a5bad465f0.tar.xz linux-9591c3a34f7722bd77f42c98d76fd5a5bad465f0.zip | |
fs: introduce a wrapper uuid_to_fsid()
Some filesystem's use a digest of their uuid for f_fsid.
Create a simple wrapper for this open coded folding.
Filesystems that have a non null uuid but use the block device
number for f_fsid may also consider using this helper.
[JK: Added missing asm/byteorder.h include]
Link: https://lore.kernel.org/r/20210322173944.449469-2-amir73il@gmail.com
Acked-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext2')
| -rw-r--r-- | fs/ext2/super.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 6c4753277916..0d679451657c 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -1399,7 +1399,6 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) struct super_block *sb = dentry->d_sb; struct ext2_sb_info *sbi = EXT2_SB(sb); struct ext2_super_block *es = sbi->s_es; - u64 fsid; spin_lock(&sbi->s_lock); @@ -1453,9 +1452,7 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) buf->f_ffree = ext2_count_free_inodes(sb); es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); buf->f_namelen = EXT2_NAME_LEN; - fsid = le64_to_cpup((void *)es->s_uuid) ^ - le64_to_cpup((void *)es->s_uuid + sizeof(u64)); - buf->f_fsid = u64_to_fsid(fsid); + buf->f_fsid = uuid_to_fsid(es->s_uuid); spin_unlock(&sbi->s_lock); return 0; } |