ext4: add ext4_is_quota_file()

IS_NOQUOTA() indicates whether quota is disabled for an inode. Ext4
also uses it to check whether an inode is for a quota file. The
distinction currently doesn't matter because quota is disabled only
for the quota files. When we start disabling quota for other inodes
in the future, we will want to make the distinction clear.

Replace IS_NOQUOTA() call with ext4_is_quota_file() at places where
we are checking for quota files.
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/ext4.h

@@ -2100,6 +2100,8 @@ static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
 	return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
 }
 
+#define ext4_is_quota_file(inode) IS_NOQUOTA(inode)
+
 /*
  * This structure is stuffed into the struct file's private_data field
  * for directories.  It is where we put information so that we can do

fs/ext4/inode.c

@@ -739,7 +739,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
 		if (map->m_flags & EXT4_MAP_NEW &&
 		    !(map->m_flags & EXT4_MAP_UNWRITTEN) &&
 		    !(flags & EXT4_GET_BLOCKS_ZERO) &&
-		    !IS_NOQUOTA(inode) &&
+		    !ext4_is_quota_file(inode) &&
 		    ext4_should_order_data(inode)) {
 			if (flags & EXT4_GET_BLOCKS_IO_SUBMIT)
 				ret = ext4_jbd2_inode_add_wait(handle, inode);

fs/ext4/ioctl.c

@@ -218,7 +218,7 @@ static int ext4_ioctl_setflags(struct inode *inode,
 	unsigned int jflag;
 
 	/* Is it quota file? Do not allow user to mess with it */
-	if (IS_NOQUOTA(inode))
+	if (ext4_is_quota_file(inode))
 		goto flags_out;
 
 	oldflags = ei->i_flags;
@@ -342,7 +342,7 @@ static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 	err = -EPERM;
 	inode_lock(inode);
 	/* Is it quota file? Do not allow user to mess with it */
-	if (IS_NOQUOTA(inode))
+	if (ext4_is_quota_file(inode))
 		goto out_unlock;
 
 	err = ext4_get_inode_loc(inode, &iloc);

fs/ext4/mballoc.c

@@ -4464,7 +4464,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 	trace_ext4_request_blocks(ar);
 
 	/* Allow to use superuser reservation for quota file */
-	if (IS_NOQUOTA(ar->inode))
+	if (ext4_is_quota_file(ar->inode))
 		ar->flags |= EXT4_MB_USE_ROOT_BLOCKS;
 
 	if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) {

fs/ext4/move_extent.c

@@ -484,7 +484,7 @@ mext_check_arguments(struct inode *orig_inode,
 		return -EBUSY;
 	}
 
-	if (IS_NOQUOTA(orig_inode) || IS_NOQUOTA(donor_inode)) {
+	if (ext4_is_quota_file(orig_inode) && ext4_is_quota_file(donor_inode)) {
 		ext4_debug("ext4 move extent: The argument files should "
 			"not be quota files [ino:orig %lu, donor %lu]\n",
 			orig_inode->i_ino, donor_inode->i_ino);