bcachefs: more project quota fixes

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/fs-ioctl.c

@@ -104,19 +104,6 @@ static int bch2_ioc_fsgetxattr(struct bch_inode_info *inode,
 	return copy_to_user(arg, &fa, sizeof(fa));
 }
 
-static int bch2_set_projid(struct bch_fs *c,
-			   struct bch_inode_info *inode,
-			   u32 projid)
-{
-	struct bch_qid qid = inode->ei_qid;
-
-	qid.q[QTYP_PRJ] = projid;
-
-	return bch2_fs_quota_transfer(c, inode, qid,
-				      1 << QTYP_PRJ,
-				      KEY_TYPE_QUOTA_PREALLOC);
-}
-
 static int fssetxattr_inode_update_fn(struct bch_inode_info *inode,
 				      struct bch_inode_unpacked *bi,
 				      void *p)
@@ -124,11 +111,7 @@ static int fssetxattr_inode_update_fn(struct bch_inode_info *inode,
 	struct flags_set *s = p;
 
 	if (s->projid != bi->bi_project) {
-		if (s->projid)
 		bi->bi_fields_set |= 1U << Inode_opt_project;
-		else
-			bi->bi_fields_set &= ~(1U << Inode_opt_project);
-
 		bi->bi_project = s->projid;
 	}
 
@@ -151,7 +134,10 @@ static int bch2_ioc_fssetxattr(struct bch_fs *c,
 	if (fa.fsx_xflags)
 		return -EOPNOTSUPP;
 
-	s.projid = fa.fsx_projid;
+	if (fa.fsx_projid >= U32_MAX)
+		return -EINVAL;
+
+	s.projid = fa.fsx_projid + 1;
 
 	ret = mnt_want_write_file(file);
 	if (ret)
@@ -164,7 +150,7 @@ static int bch2_ioc_fssetxattr(struct bch_fs *c,
 	}
 
 	mutex_lock(&inode->ei_update_lock);
-	ret = bch2_set_projid(c, inode, fa.fsx_projid);
+	ret = bch2_set_projid(c, inode, s.projid);
 	if (ret)
 		goto err_unlock;
 

fs/bcachefs/fs.h

@@ -121,6 +121,19 @@ int bch2_fs_quota_transfer(struct bch_fs *,
 			   unsigned,
 			   enum quota_acct_mode);
 
+static inline int bch2_set_projid(struct bch_fs *c,
+				  struct bch_inode_info *inode,
+				  u32 projid)
+{
+	struct bch_qid qid = inode->ei_qid;
+
+	qid.q[QTYP_PRJ] = projid;
+
+	return bch2_fs_quota_transfer(c, inode, qid,
+				      1 << QTYP_PRJ,
+				      KEY_TYPE_QUOTA_PREALLOC);
+}
+
 struct inode *bch2_vfs_inode_get(struct bch_fs *, u64);
 
 /* returns 0 if we want to do the update, or error is passed up */

fs/bcachefs/quota.h

@@ -20,7 +20,7 @@ static inline struct bch_qid bch_qid(struct bch_inode_unpacked *u)
 	return (struct bch_qid) {
 		.q[QTYP_USR] = u->bi_uid,
 		.q[QTYP_GRP] = u->bi_gid,
-		.q[QTYP_PRJ] = u->bi_project,
+		.q[QTYP_PRJ] = u->bi_project ? u->bi_project - 1 : 0,
 	};
 }
 

fs/bcachefs/xattr.c

@@ -515,7 +515,14 @@ static int bch2_xattr_bcachefs_set(const struct xattr_handler *handler,
 	}
 
 	mutex_lock(&inode->ei_update_lock);
+	if (inode_opt_id == Inode_opt_project) {
+		ret = bch2_set_projid(c, inode, s.v);
+		if (ret)
+			goto err;
+	}
+
 	ret = bch2_write_inode(c, inode, inode_opt_set_fn, &s, 0);
+err:
 	mutex_unlock(&inode->ei_update_lock);
 
 	if (value &&