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authorGlen Overby <overby@sgi.com>2006-03-29 09:52:28 +1000
committerNathan Scott <nathans@sgi.com>2006-03-29 09:52:28 +1000
commit3ccb8b5f650e80b7cc7ef76289348472e026b6ac (patch)
tree4271489ba63b163c6ae997075efe6e5472f3d8d2 /fs/xfs/xfs_ialloc.c
parent3c674e74238cb2484169e3f84f687c66887086b6 (diff)
[XFS] A change to inode chunk allocation to try allocating the new chunk
contiguous with the most recently allocated chunk. On a striped filesystem, this will fill a stripe unit with inodes before allocating new inodes in another stripe unit. SGI-PV: 951416 SGI-Modid: xfs-linux-melb:xfs-kern:208488a Signed-off-by: Glen Overby <overby@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_ialloc.c')
-rw-r--r--fs/xfs/xfs_ialloc.c108
1 files changed, 68 insertions, 40 deletions
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index 20c39a6e6a0c..4eeb856183b1 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -136,7 +136,7 @@ xfs_ialloc_ag_alloc(
int ninodes; /* num inodes per buf */
xfs_agino_t thisino; /* current inode number, for loop */
int version; /* inode version number to use */
- int isaligned; /* inode allocation at stripe unit */
+ int isaligned = 0; /* inode allocation at stripe unit */
/* boundary */
args.tp = tp;
@@ -152,47 +152,75 @@ xfs_ialloc_ag_alloc(
return XFS_ERROR(ENOSPC);
args.minlen = args.maxlen = XFS_IALLOC_BLOCKS(args.mp);
/*
- * Set the alignment for the allocation.
- * If stripe alignment is turned on then align at stripe unit
- * boundary.
- * If the cluster size is smaller than a filesystem block
- * then we're doing I/O for inodes in filesystem block size pieces,
- * so don't need alignment anyway.
- */
- isaligned = 0;
- if (args.mp->m_sinoalign) {
- ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN));
- args.alignment = args.mp->m_dalign;
- isaligned = 1;
- } else if (XFS_SB_VERSION_HASALIGN(&args.mp->m_sb) &&
- args.mp->m_sb.sb_inoalignmt >=
- XFS_B_TO_FSBT(args.mp, XFS_INODE_CLUSTER_SIZE(args.mp)))
- args.alignment = args.mp->m_sb.sb_inoalignmt;
- else
- args.alignment = 1;
+ * First try to allocate inodes contiguous with the last-allocated
+ * chunk of inodes. If the filesystem is striped, this will fill
+ * an entire stripe unit with inodes.
+ */
agi = XFS_BUF_TO_AGI(agbp);
- /*
- * Need to figure out where to allocate the inode blocks.
- * Ideally they should be spaced out through the a.g.
- * For now, just allocate blocks up front.
- */
- args.agbno = be32_to_cpu(agi->agi_root);
- args.fsbno = XFS_AGB_TO_FSB(args.mp, be32_to_cpu(agi->agi_seqno),
- args.agbno);
- /*
- * Allocate a fixed-size extent of inodes.
- */
- args.type = XFS_ALLOCTYPE_NEAR_BNO;
- args.mod = args.total = args.wasdel = args.isfl = args.userdata =
- args.minalignslop = 0;
- args.prod = 1;
- /*
- * Allow space for the inode btree to split.
- */
- args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
- if ((error = xfs_alloc_vextent(&args)))
- return error;
+ newino = be32_to_cpu(agi->agi_newino);
+ if(likely(newino != NULLAGINO)) {
+ args.agbno = XFS_AGINO_TO_AGBNO(args.mp, newino) +
+ XFS_IALLOC_BLOCKS(args.mp);
+ args.fsbno = XFS_AGB_TO_FSB(args.mp,
+ be32_to_cpu(agi->agi_seqno), args.agbno);
+ args.type = XFS_ALLOCTYPE_THIS_BNO;
+ args.mod = args.total = args.wasdel = args.isfl =
+ args.userdata = args.minalignslop = 0;
+ args.prod = 1;
+ args.alignment = 1;
+ /*
+ * Allow space for the inode btree to split.
+ */
+ args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ } else
+ args.fsbno = NULLFSBLOCK;
+ if (unlikely(args.fsbno == NULLFSBLOCK)) {
+ /*
+ * Set the alignment for the allocation.
+ * If stripe alignment is turned on then align at stripe unit
+ * boundary.
+ * If the cluster size is smaller than a filesystem block
+ * then we're doing I/O for inodes in filesystem block size
+ * pieces, so don't need alignment anyway.
+ */
+ isaligned = 0;
+ if (args.mp->m_sinoalign) {
+ ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN));
+ args.alignment = args.mp->m_dalign;
+ isaligned = 1;
+ } else if (XFS_SB_VERSION_HASALIGN(&args.mp->m_sb) &&
+ args.mp->m_sb.sb_inoalignmt >=
+ XFS_B_TO_FSBT(args.mp,
+ XFS_INODE_CLUSTER_SIZE(args.mp)))
+ args.alignment = args.mp->m_sb.sb_inoalignmt;
+ else
+ args.alignment = 1;
+ /*
+ * Need to figure out where to allocate the inode blocks.
+ * Ideally they should be spaced out through the a.g.
+ * For now, just allocate blocks up front.
+ */
+ args.agbno = be32_to_cpu(agi->agi_root);
+ args.fsbno = XFS_AGB_TO_FSB(args.mp,
+ be32_to_cpu(agi->agi_seqno), args.agbno);
+ /*
+ * Allocate a fixed-size extent of inodes.
+ */
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.mod = args.total = args.wasdel = args.isfl =
+ args.userdata = args.minalignslop = 0;
+ args.prod = 1;
+ /*
+ * Allow space for the inode btree to split.
+ */
+ args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+
/*
* If stripe alignment is turned on, then try again with cluster
* alignment.