[PATCH 03/13] xfs: remove m_attroffset

Christoph Hellwig
2009-02-10T20:30:16Z

[-- Attachment #1: xfs-xfs_default_attroffset --]
[-- Type: text/plain, Size: 6676 bytes --]

With the upcoming v3 inodes the default attroffset needs to be calculated
for each specific inode, so we can't cache it in the superblock anymore.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/xfs_mount.c
===================================================================
--- xfs.orig/fs/xfs/xfs_mount.c 2009-02-09 19:15:29.083069118 +0100
+++ xfs/fs/xfs/xfs_mount.c 2009-02-09 19:15:35.578944518 +0100
@@ -566,6 +566,9 @@ xfs_readsb(xfs_mount_t *mp, int flags)
STATIC void
xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
{
+ ASSERT(sbp->sb_inodesize == 256 || sbp->sb_inodesize == 512 ||
+ sbp->sb_inodesize == 1024 || sbp->sb_inodesize == 2048);
+
mp->m_agfrotor = mp->m_agirotor = 0;
spin_lock_init(&mp->m_agirotor_lock);
mp->m_maxagi = mp->m_sb.sb_agcount;
@@ -578,27 +581,6 @@ xfs_mount_common(xfs_mount_t *mp, xfs_sb
mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
mp->m_blockwmask = mp->m_blockwsize - 1;

- /*
- * Setup for attributes, in case they get created.
- * This value is for inodes getting attributes for the first time,
- * the per-inode value is for old attribute values.
- */
- ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
- switch (sbp->sb_inodesize) {
- case 256:
- mp->m_attroffset = XFS_LITINO(mp) -
- XFS_BMDR_SPACE_CALC(MINABTPTRS);
- break;
- case 512:
- case 1024:
- case 2048:
- mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
- break;
- default:
- ASSERT(0);
- }
- ASSERT(mp->m_attroffset < XFS_LITINO(mp));
-
mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;
Index: xfs/fs/xfs/xfs_attr_leaf.c
===================================================================
--- xfs.orig/fs/xfs/xfs_attr_leaf.c 2009-02-09 19:15:18.754098923 +0100
+++ xfs/fs/xfs/xfs_attr_leaf.c 2009-02-09 19:15:35.580944493 +0100
@@ -155,7 +155,8 @@ xfs_attr_shortform_bytesfit(xfs_inode_t
* minimum offset only needs to be the space required for
* the btree root.
*/
- if (!dp->i_d.di_forkoff && dp->i_df.if_bytes > mp->m_attroffset)
+ if (!dp->i_d.di_forkoff && dp->i_df.if_bytes >
+ xfs_default_attroffset(dp))
dsize = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
break;

Index: xfs/fs/xfs/xfs_bmap.c
===================================================================
--- xfs.orig/fs/xfs/xfs_bmap.c 2009-02-09 19:15:18.758069609 +0100
+++ xfs/fs/xfs/xfs_bmap.c 2009-02-09 19:15:35.583944247 +0100
@@ -3577,6 +3577,27 @@ xfs_bmap_extents_to_btree(
}

/*
+ * Calculate the default attribute fork offset for newly created inodes.
+ */
+uint
+xfs_default_attroffset(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ uint offset;
+
+ if (mp->m_sb.sb_inodesize == 256) {
+ offset = XFS_LITINO(mp) -
+ XFS_BMDR_SPACE_CALC(MINABTPTRS);
+ } else {
+ offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
+ }
+
+ ASSERT(offset < XFS_LITINO(mp));
+ return offset;
+}
+
+/*
* Helper routine to reset inode di_forkoff field when switching
* attribute fork from local to extent format - we reset it where
* possible to make space available for inline data fork extents.
@@ -3588,15 +3609,18 @@ xfs_bmap_forkoff_reset(
int whichfork)
{
if (whichfork == XFS_ATTR_FORK &&
- (ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
- (ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
- (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
- ((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
- ip->i_d.di_forkoff = mp->m_attroffset >> 3;
- ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
- (uint)sizeof(xfs_bmbt_rec_t);
- ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
- (uint)sizeof(xfs_bmbt_rec_t);
+ ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
+ ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
+ ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
+ uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
+
+ if (dfl_forkoff > ip->i_d.di_forkoff) {
+ ip->i_d.di_forkoff = dfl_forkoff;
+ ip->i_df.if_ext_max =
+ XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
+ ip->i_afp->if_ext_max =
+ XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
+ }
}
}

@@ -4065,7 +4089,7 @@ xfs_bmap_add_attrfork(
case XFS_DINODE_FMT_BTREE:
ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
if (!ip->i_d.di_forkoff)
- ip->i_d.di_forkoff = mp->m_attroffset >> 3;
+ ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
else if (mp->m_flags & XFS_MOUNT_ATTR2)
version = 2;
break;
@@ -4212,12 +4236,12 @@ xfs_bmap_compute_maxlevels(
* (a signed 16-bit number, xfs_aextnum_t).
*
* Note that we can no longer assume that if we are in ATTR1 that
- * the fork offset of all the inodes will be (m_attroffset >> 3)
- * because we could have mounted with ATTR2 and then mounted back
- * with ATTR1, keeping the di_forkoff's fixed but probably at
- * various positions. Therefore, for both ATTR1 and ATTR2
- * we have to assume the worst case scenario of a minimum size
- * available.
+ * the fork offset of all the inodes will be
+ * (xfs_default_attroffset(ip) >> 3) because we could have mounted
+ * with ATTR2 and then mounted back with ATTR1, keeping the
+ * di_forkoff's fixed but probably at various positions. Therefore,
+ * for both ATTR1 and ATTR2 we have to assume the worst case scenario
+ * of a minimum size available.
*/
if (whichfork == XFS_DATA_FORK) {
maxleafents = MAXEXTNUM;
Index: xfs/fs/xfs/xfs_bmap.h
===================================================================
--- xfs.orig/fs/xfs/xfs_bmap.h 2009-02-09 19:15:18.763069338 +0100
+++ xfs/fs/xfs/xfs_bmap.h 2009-02-09 19:15:35.583944247 +0100
@@ -338,6 +338,10 @@ xfs_check_nostate_extents(
xfs_extnum_t idx,
xfs_extnum_t num);

+uint
+xfs_default_attroffset(
+ struct xfs_inode *ip);
+
#ifdef __KERNEL__

/*
Index: xfs/fs/xfs/xfs_mount.h
===================================================================
--- xfs.orig/fs/xfs/xfs_mount.h 2009-02-09 19:15:29.084069385 +0100
+++ xfs/fs/xfs/xfs_mount.h 2009-02-09 19:15:35.584944583 +0100
@@ -276,7 +276,6 @@ typedef struct xfs_mount {
int m_fixedfsid[2]; /* unchanged for life of FS */
uint m_dmevmask; /* DMI events for this FS */
__uint64_t m_flags; /* global mount flags */
- uint m_attroffset; /* inode attribute offset */
uint m_dir_node_ents; /* #entries in a dir danode */
uint m_attr_node_ents; /* #entries in attr danode */
int m_ialloc_inos; /* inodes in inode allocation */