ext2: Set flags on quota files directly

Currently immutable and noatime flags on quota files are set by quota
code which requires us to copy inode->i_flags to our on disk version of
quota flags in GETFLAGS ioctl and __ext2_write_inode().  Move to setting
/ clearing these on-disk flags directly to save that copying.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 76 insertions, 2 deletions

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index b3090416a936..8ac673c71a36 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -122,13 +122,29 @@ void ext2_update_dynamic_rev(struct super_block *sb)
          */
 }
 
+#ifdef CONFIG_QUOTA
+static int ext2_quota_off(struct super_block *sb, int type);
+
+static void ext2_quota_off_umount(struct super_block *sb)
+{
+        int type;
+
+        for (type = 0; type < MAXQUOTAS; type++)
+                ext2_quota_off(sb, type);
+}
+#else
+static inline void ext2_quota_off_umount(struct super_block *sb)
+{
+}
+#endif
+
 static void ext2_put_super (struct super_block * sb)
 {
         int db_count;
         int i;
         struct ext2_sb_info *sbi = EXT2_SB(sb);
 
-        dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+        ext2_quota_off_umount(sb);
 
         if (sbi->s_mb_cache) {
                 ext2_xattr_destroy_cache(sbi->s_mb_cache);
@@ -313,10 +329,23 @@ static int ext2_show_options(struct seq_file *seq, struct dentry *root)
 #ifdef CONFIG_QUOTA
 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
+static int ext2_quota_on(struct super_block *sb, int type, int format_id,
+                         const struct path *path);
 static struct dquot **ext2_get_dquots(struct inode *inode)
 {
         return EXT2_I(inode)->i_dquot;
 }
+
+static const struct quotactl_ops ext2_quotactl_ops = {
+        .quota_on       = ext2_quota_on,
+        .quota_off      = ext2_quota_off,
+        .quota_sync     = dquot_quota_sync,
+        .get_state      = dquot_get_state,
+        .set_info       = dquot_set_dqinfo,
+        .get_dqblk      = dquot_get_dqblk,
+        .set_dqblk      = dquot_set_dqblk,
+        .get_nextdqblk  = dquot_get_next_dqblk,
+};
 #endif
 
 static const struct super_operations ext2_sops = {
@@ -1116,7 +1145,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 
 #ifdef CONFIG_QUOTA
         sb->dq_op = &dquot_operations;
-        sb->s_qcop = &dquot_quotactl_ops;
+        sb->s_qcop = &ext2_quotactl_ops;
         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
 #endif
 
@@ -1547,6 +1576,51 @@ out:
         return len - towrite;
 }
 
+static int ext2_quota_on(struct super_block *sb, int type, int format_id,
+                         const struct path *path)
+{
+        int err;
+        struct inode *inode;
+
+        err = dquot_quota_on(sb, type, format_id, path);
+        if (err)
+                return err;
+
+        inode = d_inode(path->dentry);
+        inode_lock(inode);
+        EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
+        inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
+                        S_NOATIME | S_IMMUTABLE);
+        inode_unlock(inode);
+        mark_inode_dirty(inode);
+
+        return 0;
+}
+
+static int ext2_quota_off(struct super_block *sb, int type)
+{
+        struct inode *inode = sb_dqopt(sb)->files[type];
+        int err;
+
+        if (!inode || !igrab(inode))
+                goto out;
+
+        err = dquot_quota_off(sb, type);
+        if (err)
+                goto out_put;
+
+        inode_lock(inode);
+        EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
+        inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
+        inode_unlock(inode);
+        mark_inode_dirty(inode);
+out_put:
+        iput(inode);
+        return err;
+out:
+        return dquot_quota_off(sb, type);
+}
+
 #endif
 
 static struct file_system_type ext2_fs_type = {