[PATCH v2 34/35] ubifs: implement ubifs_get_qsize to get quota size in ubifs

[Dongsheng Yang]

We only care the size of regular file in ubifs for quota.
The reason is similar with the comment in ubifs_getattr().

Signed-off-by: Dongsheng Yang <yangds.fnst at cn.fujitsu.com>
---
 fs/ubifs/dir.c   |  3 +++
 fs/ubifs/file.c  | 19 +++++++++++++++++++
 fs/ubifs/ubifs.h |  1 +
 3 files changed, 23 insertions(+)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index d430bb6..4230818 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1214,6 +1214,9 @@ const struct file_operations ubifs_dir_operations = {
 	.iterate        = ubifs_readdir,
 	.fsync          = ubifs_fsync,
 	.unlocked_ioctl = ubifs_ioctl,
+#ifdef CONFIG_QUOTA
+	.get_qsize	= ubifs_get_qsize,
+#endif
 #ifdef CONFIG_COMPAT
 	.compat_ioctl   = ubifs_compat_ioctl,
 #endif
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index c4651a8..e916306 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1640,6 +1640,22 @@ static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 	return 0;
 }
 
+/*
+ * ubifs_get_qsize: get the quota size of a file
+ * @inode: inode which we are going to get the qsize
+ *
+ * We only care the size of regular file in ubifs
+ * for quota. The reason is similar with the comment
+ * in ubifs_getattr().
+ */
+ssize_t ubifs_get_qsize(struct inode *inode)
+{
+	if (S_ISREG(inode->i_mode))
+		return i_size_read(inode);
+	else
+		return 0;
+}
+
 const struct address_space_operations ubifs_file_address_operations = {
 	.readpage       = ubifs_readpage,
 	.writepage      = ubifs_writepage,
@@ -1685,6 +1701,9 @@ const struct file_operations ubifs_file_operations = {
 	.unlocked_ioctl = ubifs_ioctl,
 	.splice_read	= generic_file_splice_read,
 	.splice_write	= iter_file_splice_write,
+#ifdef CONFIG_QUOTA
+	.get_qsize	= ubifs_get_qsize,
+#endif
 #ifdef CONFIG_COMPAT
 	.compat_ioctl   = ubifs_compat_ioctl,
 #endif
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 3b5a204..5e4ed2a 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1761,6 +1761,7 @@ int ubifs_read_block(struct inode *inode, void *addr, unsigned int block,
 int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 int ubifs_setattr(struct dentry *dentry, struct iattr *attr);
 int ubifs_update_time(struct inode *inode, struct timespec *time, int flags);
+ssize_t ubifs_get_qsize(struct inode *inode);
 
 /* dir.c */
 struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir,
-- 
1.8.4.2