xfs: rename xfs_get_perag

xfs_get_perag is really getting the perag that an inode belongs to
based on it's inode number. Convert the use of this function to just
get the perag from a provided ag number.  Use this new function to
obtain the per-ag structure when traversing the per AG inode trees
for sync and reclaim.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

4 files changed, 27 insertions, 21 deletions

diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index 0f90bfe2815f..cc964faf12e9 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -90,14 +90,13 @@ xfs_inode_ag_lookup(
 STATIC int
 xfs_inode_ag_walk(
         struct xfs_mount        *mp,
-        xfs_agnumber_t          ag,
+        struct xfs_perag        *pag,
         int                     (*execute)(struct xfs_inode *ip,
                                            struct xfs_perag *pag, int flags),
         int                     flags,
         int                     tag,
         int                     exclusive)
 {
-        struct xfs_perag        *pag = &mp->m_perag[ag];
         uint32_t                first_index;
         int                     last_error = 0;
         int                     skipped;
@@ -141,8 +140,6 @@ restart:
                 delay(1);
                 goto restart;
         }
-
-        xfs_put_perag(mp, pag);
         return last_error;
 }
 
@@ -160,10 +157,16 @@ xfs_inode_ag_iterator(
         xfs_agnumber_t          ag;
 
         for (ag = 0; ag < mp->m_sb.sb_agcount; ag++) {
-                if (!mp->m_perag[ag].pag_ici_init)
+                struct xfs_perag        *pag;
+
+                pag = xfs_perag_get(mp, ag);
+                if (!pag->pag_ici_init) {
+                        xfs_perag_put(pag);
                         continue;
-                error = xfs_inode_ag_walk(mp, ag, execute, flags, tag,
+                }
+                error = xfs_inode_ag_walk(mp, pag, execute, flags, tag,
                                                 exclusive);
+                xfs_perag_put(pag);
                 if (error) {
                         last_error = error;
                         if (error == EFSCORRUPTED)
@@ -690,16 +693,17 @@ void
 xfs_inode_set_reclaim_tag(
         xfs_inode_t     *ip)
 {
-        xfs_mount_t     *mp = ip->i_mount;
-        xfs_perag_t     *pag = xfs_get_perag(mp, ip->i_ino);
+        struct xfs_mount *mp = ip->i_mount;
+        struct xfs_perag *pag;
 
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
         read_lock(&pag->pag_ici_lock);
         spin_lock(&ip->i_flags_lock);
         __xfs_inode_set_reclaim_tag(pag, ip);
         __xfs_iflags_set(ip, XFS_IRECLAIMABLE);
         spin_unlock(&ip->i_flags_lock);
         read_unlock(&pag->pag_ici_lock);
-        xfs_put_perag(mp, pag);
+        xfs_perag_put(pag);
 }
 
 void
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
index 155e798f30a1..e281eb4a1c49 100644
--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -374,7 +374,7 @@ xfs_iget(
                 return EINVAL;
 
         /* get the perag structure and ensure that it's inode capable */
-        pag = xfs_get_perag(mp, ino);
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ino));
         if (!pag->pagi_inodeok)
                 return EINVAL;
         ASSERT(pag->pag_ici_init);
@@ -398,7 +398,7 @@ again:
                 if (error)
                         goto out_error_or_again;
         }
-        xfs_put_perag(mp, pag);
+        xfs_perag_put(pag);
 
         *ipp = ip;
 
@@ -417,7 +417,7 @@ out_error_or_again:
                 delay(1);
                 goto again;
         }
-        xfs_put_perag(mp, pag);
+        xfs_perag_put(pag);
         return error;
 }
 
@@ -488,12 +488,12 @@ xfs_ireclaim(
          * added to the tree assert that it's been there before to catch
          * problems with the inode life time early on.
          */
-        pag = xfs_get_perag(mp, ip->i_ino);
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
         write_lock(&pag->pag_ici_lock);
         if (!radix_tree_delete(&pag->pag_ici_root, agino))
                 ASSERT(0);
         write_unlock(&pag->pag_ici_lock);
-        xfs_put_perag(mp, pag);
+        xfs_perag_put(pag);
 
         /*
          * Here we do an (almost) spurious inode lock in order to coordinate
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index ef77fd88c8e3..bd3d81636d51 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1946,8 +1946,9 @@ xfs_ifree_cluster(
         xfs_inode_t             *ip, **ip_found;
         xfs_inode_log_item_t    *iip;
         xfs_log_item_t          *lip;
-        xfs_perag_t             *pag = xfs_get_perag(mp, inum);
+        struct xfs_perag        *pag;
 
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
         if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) {
                 blks_per_cluster = 1;
                 ninodes = mp->m_sb.sb_inopblock;
@@ -2088,7 +2089,7 @@ xfs_ifree_cluster(
         }
 
         kmem_free(ip_found);
-        xfs_put_perag(mp, pag);
+        xfs_perag_put(pag);
 }
 
 /*
@@ -2675,7 +2676,7 @@ xfs_iflush_cluster(
         xfs_buf_t       *bp)
 {
         xfs_mount_t             *mp = ip->i_mount;
-        xfs_perag_t             *pag = xfs_get_perag(mp, ip->i_ino);
+        struct xfs_perag        *pag;
         unsigned long           first_index, mask;
         unsigned long           inodes_per_cluster;
         int                     ilist_size;
@@ -2686,6 +2687,7 @@ xfs_iflush_cluster(
         int                     bufwasdelwri;
         int                     i;
 
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
         ASSERT(pag->pagi_inodeok);
         ASSERT(pag->pag_ici_init);
 
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 1df7e4502967..f8a68a2319b5 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -386,14 +386,14 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 /*
  * perag get/put wrappers for eventual ref counting
  */
-static inline xfs_perag_t *
-xfs_get_perag(struct xfs_mount *mp, xfs_ino_t ino)
+static inline struct xfs_perag *
+xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno)
 {
-        return &mp->m_perag[XFS_INO_TO_AGNO(mp, ino)];
+        return &mp->m_perag[agno];
 }
 
 static inline void
-xfs_put_perag(struct xfs_mount *mp, xfs_perag_t *pag)
+xfs_perag_put(struct xfs_perag *pag)
 {
         /* nothing to see here, move along */
 }