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xfs: standardize ondisk to incore conversion for refcount btrees 

Create a xfs_refcount_check_irec function to detect corruption in btree
records.  Fix all xfs_refcount_btrec_to_irec callsites to call the new
helper and bubble up corruption reports.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-04-11 19:00:02 -07:00
parent 366a0b8d49
commit 2b30cc0bf0
3 changed files with 36 additions and 25 deletions
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45
fs/xfs/libxfs/xfs_refcount.c
View File

@ -120,6 +120,30 @@ xfs_refcount_btrec_to_irec(
irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount);
}
/* Simple checks for refcount records. */
xfs_failaddr_t
xfs_refcount_check_irec(
struct xfs_btree_cur *cur,
const struct xfs_refcount_irec *irec)
{
struct xfs_perag *pag = cur->bc_ag.pag;
if (irec->rc_blockcount == 0 || irec->rc_blockcount > MAXREFCEXTLEN)
return __this_address;
if (!xfs_refcount_check_domain(irec))
return __this_address;
/* check for valid extent range, including overflow */
if (!xfs_verify_agbext(pag, irec->rc_startblock, irec->rc_blockcount))
return __this_address;
if (irec->rc_refcount == 0 || irec->rc_refcount > MAXREFCOUNT)
return __this_address;
return NULL;
}
/*
* Get the data from the pointed-to record.
*/
@ -132,6 +156,7 @@ xfs_refcount_get_rec(
struct xfs_mount *mp = cur->bc_mp;
struct xfs_perag *pag = cur->bc_ag.pag;
union xfs_btree_rec *rec;
xfs_failaddr_t fa;
int error;
error = xfs_btree_get_rec(cur, &rec, stat);
@ -139,17 +164,8 @@ xfs_refcount_get_rec(
return error;
xfs_refcount_btrec_to_irec(rec, irec);
if (irec->rc_blockcount == 0 || irec->rc_blockcount > MAXREFCEXTLEN)
goto out_bad_rec;
if (!xfs_refcount_check_domain(irec))
goto out_bad_rec;
/* check for valid extent range, including overflow */
if (!xfs_verify_agbext(pag, irec->rc_startblock, irec->rc_blockcount))
goto out_bad_rec;
if (irec->rc_refcount == 0 || irec->rc_refcount > MAXREFCOUNT)
fa = xfs_refcount_check_irec(cur, irec);
if (fa)
goto out_bad_rec;
trace_xfs_refcount_get(cur->bc_mp, pag->pag_agno, irec);
@ -157,8 +173,8 @@ xfs_refcount_get_rec(
out_bad_rec:
xfs_warn(mp,
"Refcount BTree record corruption in AG %d detected!",
pag->pag_agno);
"Refcount BTree record corruption in AG %d detected at %pS!",
pag->pag_agno, fa);
xfs_warn(mp,
"Start block 0x%x, block count 0x%x, references 0x%x",
irec->rc_startblock, irec->rc_blockcount, irec->rc_refcount);
@ -1871,7 +1887,8 @@ xfs_refcount_recover_extent(
INIT_LIST_HEAD(&rr->rr_list);
xfs_refcount_btrec_to_irec(rec, &rr->rr_rrec);
if (XFS_IS_CORRUPT(cur->bc_mp,
if (xfs_refcount_check_irec(cur, &rr->rr_rrec) != NULL ||
XFS_IS_CORRUPT(cur->bc_mp,
rr->rr_rrec.rc_domain != XFS_REFC_DOMAIN_COW)) {
kfree(rr);
return -EFSCORRUPTED;

2
fs/xfs/libxfs/xfs_refcount.h
View File

@ -117,6 +117,8 @@ extern int xfs_refcount_has_record(struct xfs_btree_cur *cur,
union xfs_btree_rec;
extern void xfs_refcount_btrec_to_irec(const union xfs_btree_rec *rec,
struct xfs_refcount_irec *irec);
xfs_failaddr_t xfs_refcount_check_irec(struct xfs_btree_cur *cur,
const struct xfs_refcount_irec *irec);
extern int xfs_refcount_insert(struct xfs_btree_cur *cur,
struct xfs_refcount_irec *irec, int *stat);

14
fs/xfs/scrub/refcount.c
View File

@ -340,24 +340,16 @@ xchk_refcountbt_rec(
{
struct xfs_refcount_irec irec;
xfs_agblock_t *cow_blocks = bs->private;
struct xfs_perag *pag = bs->cur->bc_ag.pag;
xfs_refcount_btrec_to_irec(rec, &irec);
/* Check the domain and refcount are not incompatible. */
if (!xfs_refcount_check_domain(&irec))
if (xfs_refcount_check_irec(bs->cur, &irec) != NULL) {
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
return 0;
}
if (irec.rc_domain == XFS_REFC_DOMAIN_COW)
(*cow_blocks) += irec.rc_blockcount;
/* Check the extent. */
if (!xfs_verify_agbext(pag, irec.rc_startblock, irec.rc_blockcount))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
if (irec.rc_refcount == 0)
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
xchk_refcountbt_xref(bs->sc, &irec);
return 0;