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diff --git a/sys/geom/geom_io.c b/sys/geom/geom_io.c
--- a/sys/geom/geom_io.c
+++ b/sys/geom/geom_io.c
@@ -545,6 +545,7 @@
bp->bio_from = cp;
bp->bio_to = pp;
bp->bio_error = 0;
+ bp->bio_error_compat = 0;
bp->bio_completed = 0;
KASSERT(!(bp->bio_flags & BIO_ONQUEUE),
@@ -617,6 +618,7 @@
cp = bp->bio_from;
if (cp == NULL) {
bp->bio_error = error;
+ bp->bio_error_compat = error;
bp->bio_done(bp);
return;
}
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -4471,9 +4471,22 @@
struct mtx *mtxp;
void (*done)(struct bio *);
vm_offset_t start, end;
+ bool has_error, has_error_compat;
biotrack(bp, __func__);
+ has_error = (bp->bio_flags & BIO_ERROR) != 0;
+ has_error_compat = (bp->bio_flags & BIO_ERROR_COMPAT) != 0;
+ if (has_error != has_error_compat) {
+ if (has_error) {
+ bp->bio_error_compat = bp->bio_error;
+ bp->bio_flags |= BIO_ERROR_COMPAT;
+ } else {
+ bp->bio_error = bp->bio_error_compat;
+ bp->bio_flags |= BIO_ERROR;
+ }
+ }
+
/*
* Avoid completing I/O when dumping after a panic since that may
* result in a deadlock in the filesystem or pager code. Note that
diff --git a/sys/sys/bio.h b/sys/sys/bio.h
--- a/sys/sys/bio.h
+++ b/sys/sys/bio.h
@@ -54,7 +54,7 @@
#define BIO_SPEEDUP 0x0a /* Upper layers face shortage */
/* bio_flags */
-#define BIO_ERROR 0x01 /* An error occurred processing this bio. */
+#define BIO_ERROR_COMPAT 0x01 /* KBI compat on stable/15. */
#define BIO_DONE 0x02 /* This bio is finished. */
#define BIO_ONQUEUE 0x04 /* This bio is in a queue & not yet taken. */
/*
@@ -66,6 +66,7 @@
#define BIO_TRANSIENT_MAPPING 0x20
#define BIO_VLIST 0x40
#define BIO_SWAP 0x200 /* Swap-related I/O */
+#define BIO_ERROR 0x1000 /* An error occurred processing this bio. */
#define BIO_EXTERR 0x2000
#define BIO_SPEEDUP_WRITE 0x4000 /* Resource shortage at upper layers */
#define BIO_SPEEDUP_TRIM 0x8000 /* Resource shortage at upper layers */
@@ -97,6 +98,7 @@
struct vm_page **bio_ma; /* Or unmapped. */
int bio_ma_offset; /* Offset in the first page of bio_ma. */
int bio_ma_n; /* Number of pages in bio_ma. */
+ int bio_error_compat; /* Error for KBI compat on stable/15 */
long bio_resid; /* Remaining I/O in bytes. */
void (*bio_done)(struct bio *);
void *bio_driver1; /* Private use by the provider. */

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