All callers of xfs_imap_to_bp want the dinode pointer, so let's calculate it
inside xfs_imap_to_bp. Once that is done xfs_itobp becomes a fairly pointless
wrapper which can be replaced with direct calls to xfs_imap_to_bp.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/xfs/xfs_inode.c | 131 ++++++++++++++++-------------------------------
fs/xfs/xfs_inode.h | 6 +-
fs/xfs/xfs_itable.c | 2
fs/xfs/xfs_log_recover.c | 2
fs/xfs/xfs_sync.c | 4 -
5 files changed, 54 insertions(+), 91 deletions(-)
Index: xfs/fs/xfs/xfs_inode.c
===================================================================
--- xfs.orig/fs/xfs/xfs_inode.c 2012-06-21 18:07:04.093327438 +0200
+++ xfs/fs/xfs/xfs_inode.c 2012-07-02 12:14:18.929112302 +0200
@@ -132,23 +132,28 @@ xfs_inobp_check(
#endif
/*
- * Find the buffer associated with the given inode map
- * We do basic validation checks on the buffer once it has been
- * retrieved from disk.
+ * This routine is called to map an inode to the buffer containing the on-disk
+ * version of the inode. It returns a pointer to the buffer containing the
+ * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
+ * pointer to the on-disk inode within that buffer.
+ *
+ * If a non-zero error is returned, then the contents of bpp and dipp are
+ * undefined.
*/
-STATIC int
+int
xfs_imap_to_bp(
- xfs_mount_t *mp,
- xfs_trans_t *tp,
- struct xfs_imap *imap,
- xfs_buf_t **bpp,
- uint buf_flags,
- uint iget_flags)
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_imap *imap,
+ struct xfs_dinode **dipp,
+ struct xfs_buf **bpp,
+ uint buf_flags,
+ uint iget_flags)
{
- int error;
- int i;
- int ni;
- xfs_buf_t *bp;
+ struct xfs_buf *bp;
+ int error;
+ int i;
+ int ni;
buf_flags |= XBF_UNMAPPED;
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
@@ -189,8 +194,8 @@ xfs_imap_to_bp(
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EINVAL);
}
- XFS_CORRUPTION_ERROR("xfs_imap_to_bp",
- XFS_ERRLEVEL_HIGH, mp, dip);
+ XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_HIGH,
+ mp, dip);
#ifdef DEBUG
xfs_emerg(mp,
"bad inode magic/vsn daddr %lld #%d (magic=%x)",
@@ -204,7 +209,9 @@ xfs_imap_to_bp(
}
xfs_inobp_check(mp, bp);
+
*bpp = bp;
+ *dipp = (struct xfs_dinode *)xfs_buf_offset(bp, imap->im_boffset);
return 0;
}
@@ -240,63 +247,15 @@ xfs_inotobp(
if (error)
return error;
- error = xfs_imap_to_bp(mp, tp, &imap, &bp, 0, imap_flags);
+ error = xfs_imap_to_bp(mp, tp, &imap, dipp, &bp, 0, imap_flags);
if (error)
return error;
- *dipp = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset);
*bpp = bp;
*offset = imap.im_boffset;
return 0;
}
-
-/*
- * This routine is called to map an inode to the buffer containing
- * the on-disk version of the inode. It returns a pointer to the
- * buffer containing the on-disk inode in the bpp parameter, and in
- * the dip parameter it returns a pointer to the on-disk inode within
- * that buffer.
- *
- * If a non-zero error is returned, then the contents of bpp and
- * dipp are undefined.
- *
- * The inode is expected to already been mapped to its buffer and read
- * in once, thus we can use the mapping information stored in the inode
- * rather than calling xfs_imap(). This allows us to avoid the overhead
- * of looking at the inode btree for small block file systems
- * (see xfs_imap()).
- */
-int
-xfs_itobp(
- xfs_mount_t *mp,
- xfs_trans_t *tp,
- xfs_inode_t *ip,
- xfs_dinode_t **dipp,
- xfs_buf_t **bpp,
- uint buf_flags)
-{
- xfs_buf_t *bp;
- int error;
-
- ASSERT(ip->i_imap.im_blkno != 0);
-
- error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp, buf_flags, 0);
- if (error)
- return error;
-
- if (!bp) {
- ASSERT(buf_flags & XBF_TRYLOCK);
- ASSERT(tp == NULL);
- *bpp = NULL;
- return EAGAIN;
- }
-
- *dipp = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
- *bpp = bp;
- return 0;
-}
-
/*
* Move inode type and inode format specific information from the
* on-disk inode to the in-core inode. For fifos, devs, and sockets
@@ -796,10 +755,9 @@ xfs_iread(
/*
* Get pointers to the on-disk inode and the buffer containing it.
*/
- error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp, 0, iget_flags);
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
if (error)
return error;
- dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
/*
* If we got something that isn't an inode it means someone
@@ -876,7 +834,7 @@ xfs_iread(
/*
* Use xfs_trans_brelse() to release the buffer containing the
* on-disk inode, because it was acquired with xfs_trans_read_buf()
- * in xfs_itobp() above. If tp is NULL, this is just a normal
+ * in xfs_imap_to_bp() above. If tp is NULL, this is just a normal
* brelse(). If we're within a transaction, then xfs_trans_brelse()
* will only release the buffer if it is not dirty within the
* transaction. It will be OK to release the buffer in this case,
@@ -1355,7 +1313,8 @@ xfs_iunlink(
* Here we put the head pointer into our next pointer,
* and then we fall through to point the head at us.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0);
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
+ 0, 0);
if (error)
return error;
@@ -1429,16 +1388,16 @@ xfs_iunlink_remove(
if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
/*
- * We're at the head of the list. Get the inode's
- * on-disk buffer to see if there is anyone after us
- * on the list. Only modify our next pointer if it
- * is not already NULLAGINO. This saves us the overhead
- * of dealing with the buffer when there is no need to
- * change it.
+ * We're at the head of the list. Get the inode's on-disk
+ * buffer to see if there is anyone after us on the list.
+ * Only modify our next pointer if it is not already NULLAGINO.
+ * This saves us the overhead of dealing with the buffer when
+ * there is no need to change it.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0);
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
+ 0, 0);
if (error) {
- xfs_warn(mp, "%s: xfs_itobp() returned error %d.",
+ xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.",
__func__, error);
return error;
}
@@ -1493,13 +1452,15 @@ xfs_iunlink_remove(
ASSERT(next_agino != NULLAGINO);
ASSERT(next_agino != 0);
}
+
/*
- * Now last_ibp points to the buffer previous to us on
- * the unlinked list. Pull us from the list.
+ * Now last_ibp points to the buffer previous to us on the
+ * unlinked list. Pull us from the list.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0);
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
+ 0, 0);
if (error) {
- xfs_warn(mp, "%s: xfs_itobp(2) returned error %d.",
+ xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.",
__func__, error);
return error;
}
@@ -1749,7 +1710,8 @@ xfs_ifree(
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- error = xfs_itobp(ip->i_mount, tp, ip, &dip, &ibp, 0);
+ error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, &dip, &ibp,
+ 0, 0);
if (error)
return error;
@@ -2428,7 +2390,7 @@ xfs_iflush(
/*
* For stale inodes we cannot rely on the backing buffer remaining
* stale in cache for the remaining life of the stale inode and so
- * xfs_itobp() below may give us a buffer that no longer contains
+ * xfs_imap_to_bp() below may give us a buffer that no longer contains
* inodes below. We have to check this after ensuring the inode is
* unpinned so that it is safe to reclaim the stale inode after the
* flush call.
@@ -2454,7 +2416,8 @@ xfs_iflush(
/*
* Get the buffer containing the on-disk inode.
*/
- error = xfs_itobp(mp, NULL, ip, &dip, &bp, XBF_TRYLOCK);
+ error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK,
+ 0);
if (error || !bp) {
xfs_ifunlock(ip);
return error;
Index: xfs/fs/xfs/xfs_inode.h
===================================================================
--- xfs.orig/fs/xfs/xfs_inode.h 2012-06-15 14:25:55.808399998 +0200
+++ xfs/fs/xfs/xfs_inode.h 2012-07-02 12:14:18.929112302 +0200
@@ -560,9 +560,9 @@ do { \
int xfs_inotobp(struct xfs_mount *, struct xfs_trans *,
xfs_ino_t, struct xfs_dinode **,
struct xfs_buf **, int *, uint);
-int xfs_itobp(struct xfs_mount *, struct xfs_trans *,
- struct xfs_inode *, struct xfs_dinode **,
- struct xfs_buf **, uint);
+int xfs_imap_to_bp(struct xfs_mount *, struct xfs_trans *,
+ struct xfs_imap *, struct xfs_dinode **,
+ struct xfs_buf **, uint, uint);
int xfs_iread(struct xfs_mount *, struct xfs_trans *,
struct xfs_inode *, uint);
void xfs_dinode_to_disk(struct xfs_dinode *,
Index: xfs/fs/xfs/xfs_itable.c
===================================================================
--- xfs.orig/fs/xfs/xfs_itable.c 2012-06-15 14:25:55.288399985 +0200
+++ xfs/fs/xfs/xfs_itable.c 2012-07-02 12:13:03.402446086 +0200
@@ -555,7 +555,7 @@ xfs_bulkstat_single(
/*
* note that requesting valid inode numbers which are not allocated
- * to inodes will most likely cause xfs_itobp to generate warning
+ * to inodes will most likely cause xfs_imap_to_bp to generate warning
* messages about bad magic numbers. This is ok. The fact that
* the inode isn't actually an inode is handled by the
* error check below. Done this way to make the usual case faster
Index: xfs/fs/xfs/xfs_log_recover.c
===================================================================
--- xfs.orig/fs/xfs/xfs_log_recover.c 2012-06-26 23:12:24.683076907 +0200
+++ xfs/fs/xfs/xfs_log_recover.c 2012-07-02 12:13:03.405779419 +0200
@@ -3106,7 +3106,7 @@ xlog_recover_process_one_iunlink(
/*
* Get the on disk inode to find the next inode in the bucket.
*/
- error = xfs_itobp(mp, NULL, ip, &dip, &ibp, 0);
+ error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &ibp, 0, 0);
if (error)
goto fail_iput;
Index: xfs/fs/xfs/xfs_sync.c
===================================================================
--- xfs.orig/fs/xfs/xfs_sync.c 2012-06-26 22:52:05.509750859 +0200
+++ xfs/fs/xfs/xfs_sync.c 2012-07-02 12:13:03.405779419 +0200
@@ -712,8 +712,8 @@ restart:
* Note that xfs_iflush will never block on the inode buffer lock, as
* xfs_ifree_cluster() can lock the inode buffer before it locks the
* ip->i_lock, and we are doing the exact opposite here. As a result,
- * doing a blocking xfs_itobp() to get the cluster buffer would result
- * in an ABBA deadlock with xfs_ifree_cluster().
+ * doing a blocking xfs_imap_to_bp() to get the cluster buffer would
+ * result in an ABBA deadlock with xfs_ifree_cluster().
*
* As xfs_ifree_cluser() must gather all inodes that are active in the
* cache to mark them stale, if we hit this case we don't actually want
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