xfs: use generic inode iterator in xfs_qm_dqrele_all_inodes

Use xfs_inode_ag_iterator instead of opencoding the inode walk in the
quota code.  Mark xfs_inode_ag_iterator and xfs_sync_inode_valid non-static
to allow using them from the quota code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>

3 files changed, 39 insertions, 83 deletions

diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index 9798643feb3b..a3d2e7713068 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -141,7 +141,7 @@ restart:
         return last_error;
 }
 
-STATIC int
+int
 xfs_inode_ag_iterator(
         struct xfs_mount        *mp,
         int                     (*execute)(struct xfs_inode *ip,
@@ -167,7 +167,7 @@ xfs_inode_ag_iterator(
 }
 
 /* must be called with pag_ici_lock held and releases it */
-STATIC int
+int
 xfs_sync_inode_valid(
         struct xfs_inode        *ip,
         struct xfs_perag        *pag)
diff --git a/fs/xfs/linux-2.6/xfs_sync.h b/fs/xfs/linux-2.6/xfs_sync.h
index d7b2b5f1c387..9bb1253a4023 100644
--- a/fs/xfs/linux-2.6/xfs_sync.h
+++ b/fs/xfs/linux-2.6/xfs_sync.h
@@ -54,4 +54,10 @@ void xfs_inode_set_reclaim_tag(struct xfs_inode *ip);
 void xfs_inode_clear_reclaim_tag(struct xfs_inode *ip);
 void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
                                 struct xfs_inode *ip);
+
+int xfs_sync_inode_valid(struct xfs_inode *ip, struct xfs_perag *pag);
+int xfs_inode_ag_iterator(struct xfs_mount *mp,
+        int (*execute)(struct xfs_inode *ip, struct xfs_perag *pag, int flags),
+        int flags, int tag);
+
 #endif
diff --git a/fs/xfs/quota/xfs_qm_syscalls.c b/fs/xfs/quota/xfs_qm_syscalls.c
index c7b66f6506ce..7126f855e14b 100644
--- a/fs/xfs/quota/xfs_qm_syscalls.c
+++ b/fs/xfs/quota/xfs_qm_syscalls.c
@@ -847,105 +847,55 @@ xfs_qm_export_flags(
 }
 
 
-/*
- * Release all the dquots on the inodes in an AG.
- */
-STATIC void
-xfs_qm_dqrele_inodes_ag(
-        xfs_mount_t     *mp,
-        int             ag,
-        uint            flags)
+STATIC int
+xfs_dqrele_inode(
+        struct xfs_inode        *ip,
+        struct xfs_perag        *pag,
+        int                     flags)
 {
-        xfs_inode_t     *ip = NULL;
-        xfs_perag_t     *pag = &mp->m_perag[ag];
-        int             first_index = 0;
-        int             nr_found;
-
-        do {
-                /*
-                 * use a gang lookup to find the next inode in the tree
-                 * as the tree is sparse and a gang lookup walks to find
-                 * the number of objects requested.
-                 */
-                read_lock(&pag->pag_ici_lock);
-                nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
-                                (void**)&ip, first_index, 1);
-
-                if (!nr_found) {
-                        read_unlock(&pag->pag_ici_lock);
-                        break;
-                }
-
-                /*
-                 * Update the index for the next lookup. Catch overflows
-                 * into the next AG range which can occur if we have inodes
-                 * in the last block of the AG and we are currently
-                 * pointing to the last inode.
-                 */
-                first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
-                if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino)) {
-                        read_unlock(&pag->pag_ici_lock);
-                        break;
-                }
-
-                /* skip quota inodes */
-                if (ip == XFS_QI_UQIP(mp) || ip == XFS_QI_GQIP(mp)) {
-                        ASSERT(ip->i_udquot == NULL);
-                        ASSERT(ip->i_gdquot == NULL);
-                        read_unlock(&pag->pag_ici_lock);
-                        continue;
-                }
+        int                     error;
 
-                /*
-                 * If we can't get a reference on the inode, it must be
-                 * in reclaim. Leave it for the reclaim code to flush.
-                 */
-                if (!igrab(VFS_I(ip))) {
-                        read_unlock(&pag->pag_ici_lock);
-                        continue;
-                }
+        /* skip quota inodes */
+        if (ip == XFS_QI_UQIP(ip->i_mount) || ip == XFS_QI_GQIP(ip->i_mount)) {
+                ASSERT(ip->i_udquot == NULL);
+                ASSERT(ip->i_gdquot == NULL);
                 read_unlock(&pag->pag_ici_lock);
+                return 0;
+        }
 
-                /* avoid new inodes though we shouldn't find any here */
-                if (xfs_iflags_test(ip, XFS_INEW)) {
-                        IRELE(ip);
-                        continue;
-                }
+        error = xfs_sync_inode_valid(ip, pag);
+        if (error)
+                return error;
 
-                xfs_ilock(ip, XFS_ILOCK_EXCL);
-                if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
-                        xfs_qm_dqrele(ip->i_udquot);
-                        ip->i_udquot = NULL;
-                }
-                if (flags & (XFS_PQUOTA_ACCT|XFS_GQUOTA_ACCT) &&
-                    ip->i_gdquot) {
-                        xfs_qm_dqrele(ip->i_gdquot);
-                        ip->i_gdquot = NULL;
-                }
-                xfs_iput(ip, XFS_ILOCK_EXCL);
+        xfs_ilock(ip, XFS_ILOCK_EXCL);
+        if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
+                xfs_qm_dqrele(ip->i_udquot);
+                ip->i_udquot = NULL;
+        }
+        if (flags & (XFS_PQUOTA_ACCT|XFS_GQUOTA_ACCT) && ip->i_gdquot) {
+                xfs_qm_dqrele(ip->i_gdquot);
+                ip->i_gdquot = NULL;
+        }
+        xfs_iput(ip, XFS_ILOCK_EXCL);
+        IRELE(ip);
 
-        } while (nr_found);
+        return 0;
 }
 
+
 /*
  * Go thru all the inodes in the file system, releasing their dquots.
+ *
  * Note that the mount structure gets modified to indicate that quotas are off
- * AFTER this, in the case of quotaoff. This also gets called from
- * xfs_rootumount.
+ * AFTER this, in the case of quotaoff.
  */
 void
 xfs_qm_dqrele_all_inodes(
         struct xfs_mount *mp,
         uint             flags)
 {
-        int             i;
-
         ASSERT(mp->m_quotainfo);
-        for (i = 0; i < mp->m_sb.sb_agcount; i++) {
-                if (!mp->m_perag[i].pag_ici_init)
-                        continue;
-                xfs_qm_dqrele_inodes_ag(mp, i, flags);
-        }
+        xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags, XFS_ICI_NO_TAG);
 }
 
 /*------------------------------------------------------------------------*/