quota: provide interface for readding allocated space into reserved space

[platform/kernel/linux-stable.git] / fs / quota / dquot.c

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 7a10e04..4f7f451 100644 (file)
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1102,6 +1102,14 @@ static void dquot_claim_reserved_space(struct dquot *dquot, qsize_t number)
        dquot->dq_dqb.dqb_rsvspace -= number;
 }
 
+static void dquot_reclaim_reserved_space(struct dquot *dquot, qsize_t number)
+{
+       if (WARN_ON_ONCE(dquot->dq_dqb.dqb_curspace < number))
+               number = dquot->dq_dqb.dqb_curspace;
+       dquot->dq_dqb.dqb_rsvspace += number;
+       dquot->dq_dqb.dqb_curspace -= number;
+}
+
 static inline
 void dquot_free_reserved_space(struct dquot *dquot, qsize_t number)
 {
@@ -1536,6 +1544,15 @@ void inode_claim_rsv_space(struct inode *inode, qsize_t number)
 }
 EXPORT_SYMBOL(inode_claim_rsv_space);
 
+void inode_reclaim_rsv_space(struct inode *inode, qsize_t number)
+{
+       spin_lock(&inode->i_lock);
+       *inode_reserved_space(inode) += number;
+       __inode_sub_bytes(inode, number);
+       spin_unlock(&inode->i_lock);
+}
+EXPORT_SYMBOL(inode_reclaim_rsv_space);
+
 void inode_sub_rsv_space(struct inode *inode, qsize_t number)
 {
        spin_lock(&inode->i_lock);
@@ -1710,6 +1727,35 @@ int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
 EXPORT_SYMBOL(dquot_claim_space_nodirty);
 
 /*
+ * Convert allocated space back to in-memory reserved quotas
+ */
+void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number)
+{
+       int cnt;
+
+       if (!dquot_active(inode)) {
+               inode_reclaim_rsv_space(inode, number);
+               return;
+       }
+
+       down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+       spin_lock(&dq_data_lock);
+       /* Claim reserved quotas to allocated quotas */
+       for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
+               if (inode->i_dquot[cnt])
+                       dquot_reclaim_reserved_space(inode->i_dquot[cnt],
+                                                    number);
+       }
+       /* Update inode bytes */
+       inode_reclaim_rsv_space(inode, number);
+       spin_unlock(&dq_data_lock);
+       mark_all_dquot_dirty(inode->i_dquot);
+       up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+       return;
+}
+EXPORT_SYMBOL(dquot_reclaim_space_nodirty);
+
+/*
  * This operation can block, but only after everything is updated
  */
 void __dquot_free_space(struct inode *inode, qsize_t number, int flags)