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xfs: clean up the inode cluster checking in the inobt scrub

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The code to check inobt records against inode clusters is a mess of
poorly named variables and unnecessary parameters.  Clean the
unnecessary inode number parameters out of _check_cluster_freemask in
favor of computing them inside the function instead of making the caller
do it.  In xchk_iallocbt_check_cluster, rename the variables to make it
more obvious just what chunk_ino and cluster_ino represent.

Add a tracepoint to make it easier to track each inode cluster as we
scrub it.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2019-02-01 09:08:51 -08:00
parent a1954242fa
commit b9454fe056
2 changed files with 152 additions and 58 deletions
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165
fs/xfs/scrub/ialloc.c
View File

@ -134,41 +134,69 @@ xchk_iallocbt_freecount(
return hweight64(freemask); return hweight64(freemask);
} }
/* Check a particular inode with ir_free. */ /*
* Check that an inode's allocation status matches ir_free in the inobt
* record. First we try querying the in-core inode state, and if the inode
* isn't loaded we examine the on-disk inode directly.
*
* Since there can be 1:M and M:1 mappings between inobt records and inode
* clusters, we pass in the inode location information as an inobt record;
* the index of an inode cluster within the inobt record (as well as the
* cluster buffer itself); and the index of the inode within the cluster.
*
* @irec is the inobt record.
* @cluster_base is the inode offset of the cluster within the @irec.
* @cluster_bp is the cluster buffer.
* @cluster_index is the inode offset within the inode cluster.
*/
STATIC int STATIC int
xchk_iallocbt_check_cluster_freemask( xchk_iallocbt_check_cluster_ifree(
struct xchk_btree *bs, struct xchk_btree *bs,
xfs_ino_t fsino,
xfs_agino_t chunkino,
xfs_agino_t clusterino,
struct xfs_inobt_rec_incore *irec, struct xfs_inobt_rec_incore *irec,
struct xfs_buf *bp) unsigned int cluster_base,
struct xfs_buf *cluster_bp,
unsigned int cluster_index)
{ {
struct xfs_dinode *dip;
struct xfs_mount *mp = bs->cur->bc_mp; struct xfs_mount *mp = bs->cur->bc_mp;
bool inode_is_free = false; struct xfs_dinode *dip;
xfs_ino_t fsino;
xfs_agino_t agino;
unsigned int offset;
bool irec_free;
bool ino_inuse;
bool freemask_ok; bool freemask_ok;
bool inuse; int error;
int error = 0;
if (xchk_should_terminate(bs->sc, &error)) if (xchk_should_terminate(bs->sc, &error))
return error; return error;
dip = xfs_buf_offset(bp, clusterino * mp->m_sb.sb_inodesize); /*
* Given an inobt record, an offset of a cluster within the record, and
* an offset of an inode within a cluster, compute which fs inode we're
* talking about and the offset of that inode within the buffer.
*/
agino = irec->ir_startino + cluster_base + cluster_index;
fsino = XFS_AGINO_TO_INO(mp, bs->cur->bc_private.a.agno, agino);
offset = cluster_index * mp->m_sb.sb_inodesize;
if (offset >= BBTOB(cluster_bp->b_length)) {
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
goto out;
}
dip = xfs_buf_offset(cluster_bp, offset);
irec_free = (irec->ir_free & XFS_INOBT_MASK(cluster_base +
cluster_index));
if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC || if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC ||
(dip->di_version >= 3 && (dip->di_version >= 3 && be64_to_cpu(dip->di_ino) != fsino)) {
be64_to_cpu(dip->di_ino) != fsino + clusterino)) {
xchk_btree_set_corrupt(bs->sc, bs->cur, 0); xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
goto out; goto out;
} }
if (irec->ir_free & XFS_INOBT_MASK(chunkino + clusterino)) error = xfs_icache_inode_is_allocated(mp, bs->cur->bc_tp, fsino,
inode_is_free = true; &ino_inuse);
error = xfs_icache_inode_is_allocated(mp, bs->cur->bc_tp,
fsino + clusterino, &inuse);
if (error == -ENODATA) { if (error == -ENODATA) {
/* Not cached, just read the disk buffer */ /* Not cached, just read the disk buffer */
freemask_ok = inode_is_free ^ !!(dip->di_mode); freemask_ok = irec_free ^ !!(dip->di_mode);
if (!bs->sc->try_harder && !freemask_ok) if (!bs->sc->try_harder && !freemask_ok)
return -EDEADLOCK; return -EDEADLOCK;
} else if (error < 0) { } else if (error < 0) {
@ -180,7 +208,7 @@ xchk_iallocbt_check_cluster_freemask(
goto out; goto out;
} else { } else {
/* Inode is all there. */ /* Inode is all there. */
freemask_ok = inode_is_free ^ inuse; freemask_ok = irec_free ^ ino_inuse;
} }
if (!freemask_ok) if (!freemask_ok)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0); xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
@ -188,43 +216,57 @@ xchk_iallocbt_check_cluster_freemask(
return 0; return 0;
} }
/* Check an inode cluster. */ /*
* Check that the holemask and freemask of a hypothetical inode cluster match
* what's actually on disk. If sparse inodes are enabled, the cluster does
* not actually have to map to inodes if the corresponding holemask bit is set.
*
* @cluster_base is the first inode in the cluster within the @irec.
*/
STATIC int STATIC int
xchk_iallocbt_check_cluster( xchk_iallocbt_check_cluster(
struct xchk_btree *bs, struct xchk_btree *bs,
struct xfs_inobt_rec_incore *irec, struct xfs_inobt_rec_incore *irec,
xfs_agino_t agino) unsigned int cluster_base)
{ {
struct xfs_imap imap; struct xfs_imap imap;
struct xfs_mount *mp = bs->cur->bc_mp; struct xfs_mount *mp = bs->cur->bc_mp;
struct xfs_dinode *dip; struct xfs_dinode *dip;
struct xfs_buf *bp; struct xfs_buf *cluster_bp;
xfs_ino_t fsino;
unsigned int nr_inodes; unsigned int nr_inodes;
xfs_agino_t chunkino; xfs_agnumber_t agno = bs->cur->bc_private.a.agno;
xfs_agino_t clusterino;
xfs_agblock_t agbno; xfs_agblock_t agbno;
uint16_t holemask; unsigned int cluster_index;
uint16_t cluster_mask = 0;
uint16_t ir_holemask; uint16_t ir_holemask;
int error = 0; int error = 0;
/* Make sure the freemask matches the inode records. */
nr_inodes = min_t(unsigned int, XFS_INODES_PER_CHUNK, nr_inodes = min_t(unsigned int, XFS_INODES_PER_CHUNK,
mp->m_inodes_per_cluster); mp->m_inodes_per_cluster);
fsino = XFS_AGINO_TO_INO(mp, bs->cur->bc_private.a.agno, agino); /* Map this inode cluster */
chunkino = agino - irec->ir_startino; agbno = XFS_AGINO_TO_AGBNO(mp, irec->ir_startino + cluster_base);
agbno = XFS_AGINO_TO_AGBNO(mp, agino);
/* Compute the holemask mask for this cluster. */ /* Compute a bitmask for this cluster that can be used for holemask. */
for (clusterino = 0, holemask = 0; clusterino < nr_inodes; for (cluster_index = 0;
clusterino += XFS_INODES_PER_HOLEMASK_BIT) cluster_index < nr_inodes;
holemask |= XFS_INOBT_MASK((chunkino + clusterino) / cluster_index += XFS_INODES_PER_HOLEMASK_BIT)
cluster_mask |= XFS_INOBT_MASK((cluster_base + cluster_index) /
XFS_INODES_PER_HOLEMASK_BIT); XFS_INODES_PER_HOLEMASK_BIT);
ir_holemask = (irec->ir_holemask & cluster_mask);
imap.im_blkno = XFS_AGB_TO_DADDR(mp, agno, agbno);
imap.im_len = XFS_FSB_TO_BB(mp, mp->m_blocks_per_cluster);
imap.im_boffset = 0;
trace_xchk_iallocbt_check_cluster(mp, agno, irec->ir_startino,
imap.im_blkno, imap.im_len, cluster_base, nr_inodes,
cluster_mask, ir_holemask,
XFS_INO_TO_OFFSET(mp, irec->ir_startino +
cluster_base));
/* The whole cluster must be a hole or not a hole. */ /* The whole cluster must be a hole or not a hole. */
ir_holemask = (irec->ir_holemask & holemask); if (ir_holemask != cluster_mask && ir_holemask != 0) {
if (ir_holemask != holemask && ir_holemask != 0) {
xchk_btree_set_corrupt(bs->sc, bs->cur, 0); xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
return 0; return 0;
} }
@ -241,40 +283,47 @@ xchk_iallocbt_check_cluster(
&XFS_RMAP_OINFO_INODES); &XFS_RMAP_OINFO_INODES);
/* Grab the inode cluster buffer. */ /* Grab the inode cluster buffer. */
imap.im_blkno = XFS_AGB_TO_DADDR(mp, bs->cur->bc_private.a.agno, agbno); error = xfs_imap_to_bp(mp, bs->cur->bc_tp, &imap, &dip, &cluster_bp,
imap.im_len = XFS_FSB_TO_BB(mp, mp->m_blocks_per_cluster); 0, 0);
imap.im_boffset = 0;
error = xfs_imap_to_bp(mp, bs->cur->bc_tp, &imap, &dip, &bp, 0, 0);
if (!xchk_btree_xref_process_error(bs->sc, bs->cur, 0, &error)) if (!xchk_btree_xref_process_error(bs->sc, bs->cur, 0, &error))
return 0; return error;
/* Which inodes are free? */ /* Check free status of each inode within this cluster. */
for (clusterino = 0; clusterino < nr_inodes; clusterino++) { for (cluster_index = 0; cluster_index < nr_inodes; cluster_index++) {
error = xchk_iallocbt_check_cluster_freemask(bs, fsino, error = xchk_iallocbt_check_cluster_ifree(bs, irec,
chunkino, clusterino, irec, bp); cluster_base, cluster_bp, cluster_index);
if (error) if (error)
break; break;
} }
xfs_trans_brelse(bs->cur->bc_tp, bp); xfs_trans_brelse(bs->cur->bc_tp, cluster_bp);
return error; return error;
} }
/* Make sure the free mask is consistent with what the inodes think. */ /*
* For all the inode clusters that could map to this inobt record, make sure
* that the holemask makes sense and that the allocation status of each inode
* matches the freemask.
*/
STATIC int STATIC int
xchk_iallocbt_check_freemask( xchk_iallocbt_check_clusters(
struct xchk_btree *bs, struct xchk_btree *bs,
struct xfs_inobt_rec_incore *irec) struct xfs_inobt_rec_incore *irec)
{ {
struct xfs_mount *mp = bs->cur->bc_mp; unsigned int cluster_base;
xfs_agino_t agino;
int error = 0; int error = 0;
for (agino = irec->ir_startino; /*
agino < irec->ir_startino + XFS_INODES_PER_CHUNK; * For the common case where this inobt record maps to multiple inode
agino += mp->m_inodes_per_cluster) { * clusters this will call _check_cluster for each cluster.
error = xchk_iallocbt_check_cluster(bs, irec, agino); *
* For the case that multiple inobt records map to a single cluster,
* this will call _check_cluster once.
*/
for (cluster_base = 0;
cluster_base < XFS_INODES_PER_CHUNK;
cluster_base += bs->sc->mp->m_inodes_per_cluster) {
error = xchk_iallocbt_check_cluster(bs, irec, cluster_base);
if (error) if (error)
break; break;
} }
@ -415,7 +464,7 @@ xchk_iallocbt_rec(
if (!xchk_iallocbt_chunk(bs, &irec, agino, len)) if (!xchk_iallocbt_chunk(bs, &irec, agino, len))
goto out; goto out;
goto check_freemask; goto check_clusters;
} }
/* Check each chunk of a sparse inode cluster. */ /* Check each chunk of a sparse inode cluster. */
@ -441,8 +490,8 @@ xchk_iallocbt_rec(
holecount + irec.ir_count != XFS_INODES_PER_CHUNK) holecount + irec.ir_count != XFS_INODES_PER_CHUNK)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0); xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
check_freemask: check_clusters:
error = xchk_iallocbt_check_freemask(bs, &irec); error = xchk_iallocbt_check_clusters(bs, &irec);
if (error) if (error)
goto out; goto out;

45
fs/xfs/scrub/trace.h
View File

@ -545,6 +545,51 @@ TRACE_EVENT(xchk_xref_error,
__entry->ret_ip) __entry->ret_ip)
); );
TRACE_EVENT(xchk_iallocbt_check_cluster,
TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno,
xfs_agino_t startino, xfs_daddr_t map_daddr,
unsigned short map_len, unsigned int chunk_ino,
unsigned int nr_inodes, uint16_t cluster_mask,
uint16_t holemask, unsigned int cluster_ino),
TP_ARGS(mp, agno, startino, map_daddr, map_len, chunk_ino, nr_inodes,
cluster_mask, holemask, cluster_ino),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_agnumber_t, agno)
__field(xfs_agino_t, startino)
__field(xfs_daddr_t, map_daddr)
__field(unsigned short, map_len)
__field(unsigned int, chunk_ino)
__field(unsigned int, nr_inodes)
__field(unsigned int, cluster_ino)
__field(uint16_t, cluster_mask)
__field(uint16_t, holemask)
),
TP_fast_assign(
__entry->dev = mp->m_super->s_dev;
__entry->agno = agno;
__entry->startino = startino;
__entry->map_daddr = map_daddr;
__entry->map_len = map_len;
__entry->chunk_ino = chunk_ino;
__entry->nr_inodes = nr_inodes;
__entry->cluster_mask = cluster_mask;
__entry->holemask = holemask;
__entry->cluster_ino = cluster_ino;
),
TP_printk("dev %d:%d agno %d startino %u daddr 0x%llx len %d chunkino %u nr_inodes %u cluster_mask 0x%x holemask 0x%x cluster_ino %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->agno,
__entry->startino,
__entry->map_daddr,
__entry->map_len,
__entry->chunk_ino,
__entry->nr_inodes,
__entry->cluster_mask,
__entry->holemask,
__entry->cluster_ino)
)
/* repair tracepoints */ /* repair tracepoints */
#if IS_ENABLED(CONFIG_XFS_ONLINE_REPAIR) #if IS_ENABLED(CONFIG_XFS_ONLINE_REPAIR)