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authorDarrick J. Wong <djwong@kernel.org>2021-08-06 11:05:43 -0700
committerDarrick J. Wong <djwong@kernel.org>2021-08-09 11:13:16 -0700
commita6343e4d9278b3919c809fab9945c4d8f04fadf5 (patch)
tree63ab7374508a4d1580f3251821b2d0f8dc932300 /fs/xfs/xfs_iwalk.c
parente8d04c2abcebd66bdbacd53bb273d824d4e27080 (diff)
xfs: avoid buffer deadlocks when walking fs inodes
When we're servicing an INUMBERS or BULKSTAT request or running quotacheck, grab an empty transaction so that we can use its inherent recursive buffer locking abilities to detect inode btree cycles without hitting ABBA buffer deadlocks. This patch requires the deferred inode inactivation patchset because xfs_irele cannot directly call xfs_inactive when the iwalk itself has an (empty) transaction. Found by fuzzing an inode btree pointer to introduce a cycle into the tree (xfs/365). Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_iwalk.c')
-rw-r--r--fs/xfs/xfs_iwalk.c33
1 files changed, 28 insertions, 5 deletions
diff --git a/fs/xfs/xfs_iwalk.c b/fs/xfs/xfs_iwalk.c
index 917d51eefee3..7558486f4937 100644
--- a/fs/xfs/xfs_iwalk.c
+++ b/fs/xfs/xfs_iwalk.c
@@ -83,6 +83,9 @@ struct xfs_iwalk_ag {
/* Skip empty inobt records? */
unsigned int skip_empty:1;
+
+ /* Drop the (hopefully empty) transaction when calling iwalk_fn. */
+ unsigned int drop_trans:1;
};
/*
@@ -352,7 +355,6 @@ xfs_iwalk_run_callbacks(
int *has_more)
{
struct xfs_mount *mp = iwag->mp;
- struct xfs_trans *tp = iwag->tp;
struct xfs_inobt_rec_incore *irec;
xfs_agino_t next_agino;
int error;
@@ -362,10 +364,15 @@ xfs_iwalk_run_callbacks(
ASSERT(iwag->nr_recs > 0);
/* Delete cursor but remember the last record we cached... */
- xfs_iwalk_del_inobt(tp, curpp, agi_bpp, 0);
+ xfs_iwalk_del_inobt(iwag->tp, curpp, agi_bpp, 0);
irec = &iwag->recs[iwag->nr_recs - 1];
ASSERT(next_agino >= irec->ir_startino + XFS_INODES_PER_CHUNK);
+ if (iwag->drop_trans) {
+ xfs_trans_cancel(iwag->tp);
+ iwag->tp = NULL;
+ }
+
error = xfs_iwalk_ag_recs(iwag);
if (error)
return error;
@@ -376,8 +383,15 @@ xfs_iwalk_run_callbacks(
if (!has_more)
return 0;
+ if (iwag->drop_trans) {
+ error = xfs_trans_alloc_empty(mp, &iwag->tp);
+ if (error)
+ return error;
+ }
+
/* ...and recreate the cursor just past where we left off. */
- error = xfs_inobt_cur(mp, tp, iwag->pag, XFS_BTNUM_INO, curpp, agi_bpp);
+ error = xfs_inobt_cur(mp, iwag->tp, iwag->pag, XFS_BTNUM_INO, curpp,
+ agi_bpp);
if (error)
return error;
@@ -390,7 +404,6 @@ xfs_iwalk_ag(
struct xfs_iwalk_ag *iwag)
{
struct xfs_mount *mp = iwag->mp;
- struct xfs_trans *tp = iwag->tp;
struct xfs_perag *pag = iwag->pag;
struct xfs_buf *agi_bp = NULL;
struct xfs_btree_cur *cur = NULL;
@@ -469,7 +482,7 @@ xfs_iwalk_ag(
error = xfs_iwalk_run_callbacks(iwag, &cur, &agi_bp, &has_more);
out:
- xfs_iwalk_del_inobt(tp, &cur, &agi_bp, error);
+ xfs_iwalk_del_inobt(iwag->tp, &cur, &agi_bp, error);
return error;
}
@@ -599,8 +612,18 @@ xfs_iwalk_ag_work(
error = xfs_iwalk_alloc(iwag);
if (error)
goto out;
+ /*
+ * Grab an empty transaction so that we can use its recursive buffer
+ * locking abilities to detect cycles in the inobt without deadlocking.
+ */
+ error = xfs_trans_alloc_empty(mp, &iwag->tp);
+ if (error)
+ goto out;
+ iwag->drop_trans = 1;
error = xfs_iwalk_ag(iwag);
+ if (iwag->tp)
+ xfs_trans_cancel(iwag->tp);
xfs_iwalk_free(iwag);
out:
xfs_perag_put(iwag->pag);