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NFSD: fix regression with setting ACLs.

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A recent patch moved ACL setting into nfsd_setattr().
Unfortunately it didn't work as nfsd_setattr() aborts early if
iap->ia_valid is 0.

Remove this test, and instead avoid calling notify_change() when
ia_valid is 0.

This means that nfsd_setattr() will now *always* lock the inode.
Previously it didn't if only a ATTR_MODE change was requested on a
symlink (see Commit 15b7a1b86d ("[PATCH] knfsd: fix setattr-on-symlink
error return")). I don't think this change really matters.

Fixes: c0cbe70742 ("NFSD: add posix ACLs to struct nfsd_attrs")
Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
NeilBrown 2022-09-08 12:08:40 +10:00 committed by Chuck Lever
parent 6930bcbfb6
commit 00801cd92d
1 changed files with 9 additions and 10 deletions
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19
fs/nfsd/vfs.c
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@ -300,6 +300,10 @@ commit_metadata(struct svc_fh *fhp)
static void
nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap)
{
/* Ignore mode updates on symlinks */
if (S_ISLNK(inode->i_mode))
iap->ia_valid &= ~ATTR_MODE;
/* sanitize the mode change */
if (iap->ia_valid & ATTR_MODE) {
iap->ia_mode &= S_IALLUGO;
@ -353,7 +357,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
int accmode = NFSD_MAY_SATTR;
umode_t ftype = 0;
__be32 err;
int host_err;
int host_err = 0;
bool get_write_count;
bool size_change = (iap->ia_valid & ATTR_SIZE);
@ -391,13 +395,6 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
dentry = fhp->fh_dentry;
inode = d_inode(dentry);
/* Ignore any mode updates on symlinks */
if (S_ISLNK(inode->i_mode))
iap->ia_valid &= ~ATTR_MODE;
if (!iap->ia_valid)
return 0;
nfsd_sanitize_attrs(inode, iap);
if (check_guard && guardtime != inode->i_ctime.tv_sec)
@ -448,8 +445,10 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
goto out_unlock;
}
iap->ia_valid |= ATTR_CTIME;
host_err = notify_change(&init_user_ns, dentry, iap, NULL);
if (iap->ia_valid) {
iap->ia_valid |= ATTR_CTIME;
host_err = notify_change(&init_user_ns, dentry, iap, NULL);
}
out_unlock:
if (attr->na_seclabel && attr->na_seclabel->len)