[XFS] implement generic xfs_btree_get_rec

Not really much reason to make it generic given that it's so small, but
this is the last non-method in xfs_alloc_btree.c and xfs_ialloc_btree.c,
so it makes the whole btree implementation more structured.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32206a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>

9 files changed, 91 insertions, 101 deletions

diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index e9c70249d2c5..54fa69e27761 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -155,6 +155,27 @@ xfs_alloc_update(
 }
 
 /*
+ * Get the data from the pointed-to record.
+ */
+STATIC int                              /* error */
+xfs_alloc_get_rec(
+        struct xfs_btree_cur    *cur,   /* btree cursor */
+        xfs_agblock_t           *bno,   /* output: starting block of extent */
+        xfs_extlen_t            *len,   /* output: length of extent */
+        int                     *stat)  /* output: success/failure */
+{
+        union xfs_btree_rec     *rec;
+        int                     error;
+
+        error = xfs_btree_get_rec(cur, &rec, stat);
+        if (!error && *stat == 1) {
+                *bno = be32_to_cpu(rec->alloc.ar_startblock);
+                *len = be32_to_cpu(rec->alloc.ar_blockcount);
+        }
+        return error;
+}
+
+/*
  * Compute aligned version of the found extent.
  * Takes alignment and min length into account.
  */
diff --git a/fs/xfs/xfs_alloc_btree.c b/fs/xfs/xfs_alloc_btree.c
index d256b51f913d..4d44f03858b0 100644
--- a/fs/xfs/xfs_alloc_btree.c
+++ b/fs/xfs/xfs_alloc_btree.c
@@ -41,50 +41,6 @@
 #include "xfs_error.h"
 
 
-/*
- * Get the data from the pointed-to record.
- */
-int                                     /* error */
-xfs_alloc_get_rec(
-        xfs_btree_cur_t         *cur,   /* btree cursor */
-        xfs_agblock_t           *bno,   /* output: starting block of extent */
-        xfs_extlen_t            *len,   /* output: length of extent */
-        int                     *stat)  /* output: success/failure */
-{
-        xfs_alloc_block_t       *block; /* btree block */
-#ifdef DEBUG
-        int                     error;  /* error return value */
-#endif
-        int                     ptr;    /* record number */
-
-        ptr = cur->bc_ptrs[0];
-        block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
-#ifdef DEBUG
-        if ((error = xfs_btree_check_sblock(cur, block, 0, cur->bc_bufs[0])))
-                return error;
-#endif
-        /*
-         * Off the right end or left end, return failure.
-         */
-        if (ptr > be16_to_cpu(block->bb_numrecs) || ptr <= 0) {
-                *stat = 0;
-                return 0;
-        }
-        /*
-         * Point to the record and extract its data.
-         */
-        {
-                xfs_alloc_rec_t         *rec;   /* record data */
-
-                rec = XFS_ALLOC_REC_ADDR(block, ptr, cur);
-                *bno = be32_to_cpu(rec->ar_startblock);
-                *len = be32_to_cpu(rec->ar_blockcount);
-        }
-        *stat = 1;
-        return 0;
-}
-
-
 STATIC struct xfs_btree_cur *
 xfs_allocbt_dup_cursor(
         struct xfs_btree_cur    *cur)
diff --git a/fs/xfs/xfs_alloc_btree.h b/fs/xfs/xfs_alloc_btree.h
index 8d2e3ec21fd0..22f1d709af7b 100644
--- a/fs/xfs/xfs_alloc_btree.h
+++ b/fs/xfs/xfs_alloc_btree.h
@@ -94,12 +94,6 @@ typedef	struct xfs_btree_sblock xfs_alloc_block_t;
 #define XFS_ALLOC_PTR_ADDR(bb,i,cur)    \
         XFS_BTREE_PTR_ADDR(xfs_alloc, bb, i, XFS_ALLOC_BLOCK_MAXRECS(1, cur))
 
-/*
- * Get the data from the pointed-to record.
- */
-extern int xfs_alloc_get_rec(struct xfs_btree_cur *cur, xfs_agblock_t *bno,
-                                xfs_extlen_t *len, int *stat);
-
 
 extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
                 struct xfs_trans *, struct xfs_buf *,
diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c
index 28cc76818343..8503ed5d10a0 100644
--- a/fs/xfs/xfs_btree.c
+++ b/fs/xfs/xfs_btree.c
@@ -3764,3 +3764,44 @@ error0:
         XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
         return error;
 }
+
+/*
+ * Get the data from the pointed-to record.
+ */
+int                                     /* error */
+xfs_btree_get_rec(
+        struct xfs_btree_cur    *cur,   /* btree cursor */
+        union xfs_btree_rec     **recp, /* output: btree record */
+        int                     *stat)  /* output: success/failure */
+{
+        struct xfs_btree_block  *block; /* btree block */
+        struct xfs_buf          *bp;    /* buffer pointer */
+        int                     ptr;    /* record number */
+#ifdef DEBUG
+        int                     error;  /* error return value */
+#endif
+
+        ptr = cur->bc_ptrs[0];
+        block = xfs_btree_get_block(cur, 0, &bp);
+
+#ifdef DEBUG
+        error = xfs_btree_check_block(cur, block, 0, bp);
+        if (error)
+                return error;
+#endif
+
+        /*
+         * Off the right end or left end, return failure.
+         */
+        if (ptr > xfs_btree_get_numrecs(block) || ptr <= 0) {
+                *stat = 0;
+                return 0;
+        }
+
+        /*
+         * Point to the record and extract its data.
+         */
+        *recp = xfs_btree_rec_addr(cur, ptr, block);
+        *stat = 1;
+        return 0;
+}
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index 06ef792e0aac..cee3684d871e 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -567,6 +567,7 @@ int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
 int xfs_btree_kill_iroot(struct xfs_btree_cur *);
 int xfs_btree_insert(struct xfs_btree_cur *, int *);
 int xfs_btree_delete(struct xfs_btree_cur *, int *);
+int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *);
 
 /*
  * Helpers.
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index f13f59b13cc8..c8a56c529642 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -192,6 +192,29 @@ xfs_inobt_update(
 }
 
 /*
+ * Get the data from the pointed-to record.
+ */
+int                                     /* error */
+xfs_inobt_get_rec(
+        struct xfs_btree_cur    *cur,   /* btree cursor */
+        xfs_agino_t             *ino,   /* output: starting inode of chunk */
+        __int32_t               *fcnt,  /* output: number of free inodes */
+        xfs_inofree_t           *free,  /* output: free inode mask */
+        int                     *stat)  /* output: success/failure */
+{
+        union xfs_btree_rec     *rec;
+        int                     error;
+
+        error = xfs_btree_get_rec(cur, &rec, stat);
+        if (!error && *stat == 1) {
+                *ino = be32_to_cpu(rec->inobt.ir_startino);
+                *fcnt = be32_to_cpu(rec->inobt.ir_freecount);
+                *free = be64_to_cpu(rec->inobt.ir_free);
+        }
+        return error;
+}
+
+/*
  * Allocate new inodes in the allocation group specified by agbp.
  * Return 0 for success, else error code.
  */
diff --git a/fs/xfs/xfs_ialloc.h b/fs/xfs/xfs_ialloc.h
index 4026578bc264..c5745f6d94ec 100644
--- a/fs/xfs/xfs_ialloc.h
+++ b/fs/xfs/xfs_ialloc.h
@@ -168,6 +168,11 @@ int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino,
 int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino,
                 __int32_t fcnt, xfs_inofree_t free, int *stat);
 
+/*
+ * Get the data from the pointed-to record.
+ */
+extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
+                             __int32_t *fcnt, xfs_inofree_t *free, int *stat);
 
 #endif  /* __KERNEL__ */
 
diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c
index 6c0a07d1fed3..9f4e33c945c2 100644
--- a/fs/xfs/xfs_ialloc_btree.c
+++ b/fs/xfs/xfs_ialloc_btree.c
@@ -41,50 +41,6 @@
 #include "xfs_error.h"
 
 
-/*
- * Get the data from the pointed-to record.
- */
-int                                     /* error */
-xfs_inobt_get_rec(
-        xfs_btree_cur_t         *cur,   /* btree cursor */
-        xfs_agino_t             *ino,   /* output: starting inode of chunk */
-        __int32_t               *fcnt,  /* output: number of free inodes */
-        xfs_inofree_t           *free,  /* output: free inode mask */
-        int                     *stat)  /* output: success/failure */
-{
-        xfs_inobt_block_t       *block; /* btree block */
-        xfs_buf_t               *bp;    /* buffer containing btree block */
-#ifdef DEBUG
-        int                     error;  /* error return value */
-#endif
-        int                     ptr;    /* record number */
-        xfs_inobt_rec_t         *rec;   /* record data */
-
-        bp = cur->bc_bufs[0];
-        ptr = cur->bc_ptrs[0];
-        block = XFS_BUF_TO_INOBT_BLOCK(bp);
-#ifdef DEBUG
-        if ((error = xfs_btree_check_sblock(cur, block, 0, bp)))
-                return error;
-#endif
-        /*
-         * Off the right end or left end, return failure.
-         */
-        if (ptr > be16_to_cpu(block->bb_numrecs) || ptr <= 0) {
-                *stat = 0;
-                return 0;
-        }
-        /*
-         * Point to the record and extract its data.
-         */
-        rec = XFS_INOBT_REC_ADDR(block, ptr, cur);
-        *ino = be32_to_cpu(rec->ir_startino);
-        *fcnt = be32_to_cpu(rec->ir_freecount);
-        *free = be64_to_cpu(rec->ir_free);
-        *stat = 1;
-        return 0;
-}
-
 STATIC int
 xfs_inobt_get_minrecs(
         struct xfs_btree_cur    *cur,
diff --git a/fs/xfs/xfs_ialloc_btree.h b/fs/xfs/xfs_ialloc_btree.h
index 3eff3b6e5fa4..ff7406b4bac3 100644
--- a/fs/xfs/xfs_ialloc_btree.h
+++ b/fs/xfs/xfs_ialloc_btree.h
@@ -116,13 +116,6 @@ typedef	struct xfs_btree_sblock xfs_inobt_block_t;
         (XFS_BTREE_PTR_ADDR(xfs_inobt, bb, \
                                 i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
 
-/*
- * Get the data from the pointed-to record.
- */
-extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
-                             __int32_t *fcnt, xfs_inofree_t *free, int *stat);
-
-
 extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
                 struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);