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fs: switch ->s_uuid to uuid_t

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For some file systems we still memcpy into it, but in various places this
already allows us to use the proper uuid helpers.  More to come..

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Amir Goldstein <[email protected]>
Acked-by: Mimi Zohar <[email protected]> (Changes to IMA/EVM)
Reviewed-by: Andy Shevchenko <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-05-10 15:06:33 +02:00
commit 85787090a2
14 changed files with 23 additions and 36 deletions
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5
fs/overlayfs/copy_up.c
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@ -284,7 +284,6 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
struct dentry *upper)
{
struct super_block *sb = lower->d_sb;
uuid_be *uuid = (uuid_be *) &sb->s_uuid;
const struct ovl_fh *fh = NULL;
int err;
@ -294,8 +293,8 @@ static int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
* up and a pure upper inode.
*/
if (sb->s_export_op && sb->s_export_op->fh_to_dentry &&
uuid_be_cmp(*uuid, NULL_UUID_BE)) {
fh = ovl_encode_fh(lower, uuid);
!uuid_is_null(&sb->s_uuid)) {
fh = ovl_encode_fh(lower, &sb->s_uuid);
if (IS_ERR(fh))
return PTR_ERR(fh);
}

2
fs/overlayfs/namei.c
View file

@ -135,7 +135,7 @@ static struct dentry *ovl_get_origin(struct dentry *dentry,
* Make sure that the stored uuid matches the uuid of the lower
* layer where file handle will be decoded.
*/
if (uuid_be_cmp(fh->uuid, *(uuid_be *) &mnt->mnt_sb->s_uuid))
if (!uuid_equal(&fh->uuid, &mnt->mnt_sb->s_uuid))
goto out;
origin = exportfs_decode_fh(mnt, (struct fid *)fh->fid,