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Improve arc_read() error reporting 

Debugging reported NULL de-reference panic in dnode_hold_impl() I found
that for certain types of errors arc_read() may only return error code,
but not properly report it via done and pio arguments.  Lack of done
calls may result in reference and/or memory leaks in higher level code.
Lack of error reporting via pio may result in unnoticed errors there.
For example, dbuf_read(), where dbuf_read_impl() ignores arc_read()
return, relies completely on the pio mechanism and missed the errors.

This patch makes arc_read() to always call done callback and always
propagate errors to parent zio, if either is provided.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
This commit is contained in:
Alexander Motin 2023-02-13 16:21:53 -05:00 committed by Brian Behlendorf
parent 345f8beb58
commit 48f376b0c5
1 changed files with 16 additions and 8 deletions
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24
module/zfs/arc.c
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@ -5943,6 +5943,7 @@ arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
(zio_flags & ZIO_FLAG_RAW_ENCRYPT) != 0;
boolean_t embedded_bp = !!BP_IS_EMBEDDED(bp);
boolean_t no_buf = *arc_flags & ARC_FLAG_NO_BUF;
arc_buf_t *buf = NULL;
int rc = 0;
ASSERT(!embedded_bp ||
@ -5972,7 +5973,7 @@ top:
if (!zfs_blkptr_verify(spa, bp, zio_flags & ZIO_FLAG_CONFIG_WRITER,
BLK_VERIFY_LOG)) {
rc = SET_ERROR(ECKSUM);
goto out;
goto done;
}
if (!embedded_bp) {
@ -5992,7 +5993,6 @@ top:
*/
if (hdr != NULL && HDR_HAS_L1HDR(hdr) && (HDR_HAS_RABD(hdr) ||
(hdr->b_l1hdr.b_pabd != NULL && !encrypted_read))) {
arc_buf_t *buf = NULL;
*arc_flags |= ARC_FLAG_CACHED;
if (HDR_IO_IN_PROGRESS(hdr)) {
@ -6002,7 +6002,7 @@ top:
mutex_exit(hash_lock);
ARCSTAT_BUMP(arcstat_cached_only_in_progress);
rc = SET_ERROR(ENOENT);
goto out;
goto done;
}
ASSERT3P(head_zio, !=, NULL);
@ -6130,9 +6130,7 @@ top:
ARCSTAT_CONDSTAT(!HDR_PREFETCH(hdr),
demand, prefetch, !HDR_ISTYPE_METADATA(hdr),
data, metadata, hits);
if (done)
done(NULL, zb, bp, buf, private);
goto done;
} else {
uint64_t lsize = BP_GET_LSIZE(bp);
uint64_t psize = BP_GET_PSIZE(bp);
@ -6145,10 +6143,10 @@ top:
int alloc_flags = encrypted_read ? ARC_HDR_ALLOC_RDATA : 0;
if (*arc_flags & ARC_FLAG_CACHED_ONLY) {
rc = SET_ERROR(ENOENT);
if (hash_lock != NULL)
mutex_exit(hash_lock);
goto out;
rc = SET_ERROR(ENOENT);
goto done;
}
if (hdr == NULL) {
@ -6474,6 +6472,16 @@ out:
spa_read_history_add(spa, zb, *arc_flags);
spl_fstrans_unmark(cookie);
return (rc);
done:
if (done)
done(NULL, zb, bp, buf, private);
if (pio && rc != 0) {
zio_t *zio = zio_null(pio, spa, NULL, NULL, NULL, zio_flags);
zio->io_error = rc;
zio_nowait(zio);
}
goto out;
}
arc_prune_t *