quota: Check presence of quota operation structures instead of ->quota_read and ...

Currently we check whether superblock has ->quota_read and ->quota_write
operations to check whether filesystem supports quotas. However for
example for shmfs we will not read or write dquots so check whether
quota operations are set in the superblock instead.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Message-Id: <20230725144510.253763-4-cem@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index e3e4f40..4d826c3 100644 (file)
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2367,7 +2367,7 @@ int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
 
        if (!fmt)
                return -ESRCH;
-       if (!sb->s_op->quota_write || !sb->s_op->quota_read ||
+       if (!sb->dq_op || !sb->s_qcop ||
            (type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
                error = -EINVAL;
                goto out_fmt;