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[XFS] Rework DMAPI bulkstat calls in such a way that we can directly

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extract inline attributes out of the bulkstat buffer (for that case),
rather than using an (extremely expensive for large icount filesystems)
iget for fetching attrs.

SGI-PV: 944409
SGI-Modid: xfs-linux-melb:xfs-kern:26602a

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
Nathan Scott 2006-09-28 11:01:46 +10:00 committed by Tim Shimmin
parent 726801ba06
commit 8b56f083c2
2 changed files with 61 additions and 15 deletions
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65
fs/xfs/xfs_itable.c
View File

@ -252,6 +252,46 @@ xfs_bulkstat_one(
return error;
}
/*
* Test to see whether we can use the ondisk inode directly, based
* on the given bulkstat flags, filling in dipp accordingly.
* Returns zero if the inode is dodgey.
*/
STATIC int
xfs_bulkstat_use_dinode(
xfs_mount_t *mp,
int flags,
xfs_buf_t *bp,
int clustidx,
xfs_dinode_t **dipp)
{
xfs_dinode_t *dip;
unsigned int aformat;
*dipp = NULL;
if (!bp || (flags & BULKSTAT_FG_IGET))
return 1;
dip = (xfs_dinode_t *)
xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT) != XFS_DINODE_MAGIC ||
!XFS_DINODE_GOOD_VERSION(
INT_GET(dip->di_core.di_version, ARCH_CONVERT)))
return 0;
if (flags & BULKSTAT_FG_QUICK) {
*dipp = dip;
return 1;
}
/* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
aformat = INT_GET(dip->di_core.di_aformat, ARCH_CONVERT);
if ((XFS_CFORK_Q(&dip->di_core) == 0) ||
(aformat == XFS_DINODE_FMT_LOCAL) ||
(aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
*dipp = dip;
return 1;
}
return 1;
}
/*
* Return stat information in bulk (by-inode) for the filesystem.
*/
@ -529,7 +569,8 @@ xfs_bulkstat(
((chunkidx & nimask) >>
mp->m_sb.sb_inopblog);
if (flags & BULKSTAT_FG_QUICK) {
if (flags & (BULKSTAT_FG_QUICK |
BULKSTAT_FG_INLINE)) {
ino = XFS_AGINO_TO_INO(mp, agno,
agino);
bno = XFS_AGB_TO_DADDR(mp, agno,
@ -573,21 +614,25 @@ xfs_bulkstat(
be32_add(&irbp->ir_freecount, 1);
ino = XFS_AGINO_TO_INO(mp, agno, agino);
bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
if (flags & BULKSTAT_FG_QUICK) {
dip = (xfs_dinode_t *)xfs_buf_offset(bp,
(clustidx << mp->m_sb.sb_inodelog));
if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT)
!= XFS_DINODE_MAGIC
|| !XFS_DINODE_GOOD_VERSION(
INT_GET(dip->di_core.di_version, ARCH_CONVERT)))
continue;
if (!xfs_bulkstat_use_dinode(mp, flags, bp,
clustidx, &dip))
continue;
/*
* If we need to do an iget, cannot hold bp.
* Drop it, until starting the next cluster.
*/
if ((flags & BULKSTAT_FG_INLINE) && !dip) {
if (bp)
xfs_buf_relse(bp);
bp = NULL;
}
/*
* Get the inode and fill in a single buffer.
* BULKSTAT_FG_QUICK uses dip to fill it in.
* BULKSTAT_FG_IGET uses igets.
* BULKSTAT_FG_INLINE uses dip if we have an
* inline attr fork, else igets.
* See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
* This is also used to count inodes/blks, etc
* in xfs_qm_quotacheck.

11
fs/xfs/xfs_itable.h
View File

@ -36,15 +36,16 @@ typedef int (*bulkstat_one_pf)(struct xfs_mount *mp,
/*
* Values for stat return value.
*/
#define BULKSTAT_RV_NOTHING 0
#define BULKSTAT_RV_DIDONE 1
#define BULKSTAT_RV_GIVEUP 2
#define BULKSTAT_RV_NOTHING 0
#define BULKSTAT_RV_DIDONE 1
#define BULKSTAT_RV_GIVEUP 2
/*
* Values for bulkstat flag argument.
*/
#define BULKSTAT_FG_IGET 0x1 /* Go through the buffer cache */
#define BULKSTAT_FG_QUICK 0x2 /* No iget, walk the dinode cluster */
#define BULKSTAT_FG_IGET 0x1 /* Go through the buffer cache */
#define BULKSTAT_FG_QUICK 0x2 /* No iget, walk the dinode cluster */
#define BULKSTAT_FG_INLINE 0x4 /* No iget if inline attrs */
/*
* Return stat information in bulk (by-inode) for the filesystem.