quota: generalize quota transfer interface

Current quota transfer interface support only uid/gid.
This patch extend interface in order to support various quotas types
The goal is accomplished without changes in most frequently used
vfs_dq_transfer() func.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>

3 files changed, 22 insertions, 14 deletions

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 5a831dc5ab28..4d2041fddefc 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1695,15 +1695,13 @@ EXPORT_SYMBOL(dquot_free_inode);
  * This operation can block, but only after everything is updated
  * A transaction must be started when entering this function.
  */
-int dquot_transfer(struct inode *inode, struct iattr *iattr)
+int dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask)
 {
         qsize_t space, cur_space;
         qsize_t rsv_space = 0;
         struct dquot *transfer_from[MAXQUOTAS];
         struct dquot *transfer_to[MAXQUOTAS];
         int cnt, ret = QUOTA_OK;
-        int chuid = iattr->ia_valid & ATTR_UID && inode->i_uid != iattr->ia_uid,
-            chgid = iattr->ia_valid & ATTR_GID && inode->i_gid != iattr->ia_gid;
         char warntype_to[MAXQUOTAS];
         char warntype_from_inodes[MAXQUOTAS], warntype_from_space[MAXQUOTAS];
 
@@ -1717,13 +1715,10 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
                 transfer_to[cnt] = NULL;
                 warntype_to[cnt] = QUOTA_NL_NOWARN;
         }
-        if (chuid)
-                transfer_to[USRQUOTA] = dqget(inode->i_sb, iattr->ia_uid,
-                                              USRQUOTA);
-        if (chgid)
-                transfer_to[GRPQUOTA] = dqget(inode->i_sb, iattr->ia_gid,
-                                              GRPQUOTA);
-
+        for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+                if (mask & (1 << cnt))
+                        transfer_to[cnt] = dqget(inode->i_sb, chid[cnt], cnt);
+        }
         down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
         if (IS_NOQUOTA(inode)) {        /* File without quota accounting? */
                 up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
@@ -1799,12 +1794,25 @@ over_quota:
 }
 EXPORT_SYMBOL(dquot_transfer);
 
-/* Wrapper for transferring ownership of an inode */
+/* Wrapper for transferring ownership of an inode for uid/gid only
+ * Called from FSXXX_setattr()
+ */
 int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
 {
+        qid_t chid[MAXQUOTAS];
+        unsigned long mask = 0;
+
+        if (iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) {
+                mask |= 1 << USRQUOTA;
+                chid[USRQUOTA] = iattr->ia_uid;
+        }
+        if (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid) {
+                mask |= 1 << GRPQUOTA;
+                chid[GRPQUOTA] = iattr->ia_gid;
+        }
         if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
                 vfs_dq_init(inode);
-                if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
+                if (inode->i_sb->dq_op->transfer(inode, chid, mask) == NO_QUOTA)
                         return 1;
         }
         return 0;
diff --git a/include/linux/quota.h b/include/linux/quota.h
index 92547a57e25a..edf34f2fe87d 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -301,7 +301,7 @@ struct dquot_operations {
         int (*alloc_inode) (const struct inode *, qsize_t);
         int (*free_space) (struct inode *, qsize_t);
         int (*free_inode) (const struct inode *, qsize_t);
-        int (*transfer) (struct inode *, struct iattr *);
+        int (*transfer) (struct inode *, qid_t *, unsigned long);
         int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
         struct dquot *(*alloc_dquot)(struct super_block *, int);        /* Allocate memory for new dquot */
         void (*destroy_dquot)(struct dquot *);          /* Free memory for dquot */
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index e563a20cff4f..e1cae204b5d9 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -43,7 +43,7 @@ void dquot_release_reserved_space(struct inode *inode, qsize_t number);
 int dquot_free_space(struct inode *inode, qsize_t number);
 int dquot_free_inode(const struct inode *inode, qsize_t number);
 
-int dquot_transfer(struct inode *inode, struct iattr *iattr);
+int dquot_transfer(struct inode *inode, qid_t *chid, unsigned long mask);
 int dquot_commit(struct dquot *dquot);
 int dquot_acquire(struct dquot *dquot);
 int dquot_release(struct dquot *dquot);