Date: Mon, 01 Dec 2025 03:48:24 +0000 From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: cb85c2e2e995 - stable/15 - exterror(9): add infra for bufs and bios Message-ID: <692d1008.30f0e.4bd107a0@gitrepo.freebsd.org>
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The branch stable/15 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=cb85c2e2e99551fb067ef8a20400e419069a871e commit cb85c2e2e99551fb067ef8a20400e419069a871e Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2025-10-25 09:18:28 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2025-12-01 03:39:09 +0000 exterror(9): add infra for bufs and bios MFC note: this commit changes the layout for both struct buf and bio. As such, it breaks KBI for VFS, which by itself often happens after X.0, so this is not a precedent. Discussed with: mckusick Approved by: re (cperciva) (cherry picked from commit 6c406b5b93125d030f0e63716ff389ce1a6ec4c5) --- sys/geom/geom_dev.c | 4 ++++ sys/geom/geom_disk.c | 10 ++++++++-- sys/geom/geom_subr.c | 10 ++++++++-- sys/geom/geom_vfs.c | 7 ++++++- sys/kern/vfs_bio.c | 15 +++++++++++---- sys/sys/bio.h | 7 ++++++- sys/sys/buf.h | 10 +++++++++- sys/sys/exterr_cat.h | 2 ++ 8 files changed, 54 insertions(+), 11 deletions(-) diff --git a/sys/geom/geom_dev.c b/sys/geom/geom_dev.c index 46e2695293b8..e47be2768090 100644 --- a/sys/geom/geom_dev.c +++ b/sys/geom/geom_dev.c @@ -734,6 +734,10 @@ g_dev_done(struct bio *bp2) g_trace(G_T_BIO, "g_dev_done(%p) had error %d", bp2, bp2->bio_error); bp->bio_flags |= BIO_ERROR; + if ((bp2->bio_flags & BIO_EXTERR) != 0) { + bp->bio_flags |= BIO_EXTERR; + bp->bio_exterr = bp2->bio_exterr; + } } else { if (bp->bio_cmd == BIO_READ) KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_READ); diff --git a/sys/geom/geom_disk.c b/sys/geom/geom_disk.c index 9dbf00371dba..b267130d1e0c 100644 --- a/sys/geom/geom_disk.c +++ b/sys/geom/geom_disk.c @@ -235,8 +235,14 @@ g_disk_done(struct bio *bp) bp2 = bp->bio_parent; binuptime(&now); mtx_lock(&sc->done_mtx); - if (bp2->bio_error == 0) - bp2->bio_error = bp->bio_error; + if (bp2->bio_error == 0) { + if ((bp->bio_flags & BIO_EXTERR) != 0) { + bp2->bio_flags |= BIO_EXTERR; + bp2->bio_exterr = bp->bio_exterr; + } else { + bp2->bio_error = bp->bio_error; + } + } bp2->bio_completed += bp->bio_length - bp->bio_resid; if (bp->bio_cmd == BIO_READ) diff --git a/sys/geom/geom_subr.c b/sys/geom/geom_subr.c index 1429c84942ed..c002a5d9acfe 100644 --- a/sys/geom/geom_subr.c +++ b/sys/geom/geom_subr.c @@ -1151,8 +1151,14 @@ g_std_done(struct bio *bp) struct bio *bp2; bp2 = bp->bio_parent; - if (bp2->bio_error == 0) - bp2->bio_error = bp->bio_error; + if (bp2->bio_error == 0) { + if ((bp->bio_flags & BIO_EXTERR) != 0) { + bp2->bio_flags |= BIO_EXTERR; + bp2->bio_exterr = bp->bio_exterr; + } else { + bp2->bio_error = bp->bio_error; + } + } bp2->bio_completed += bp->bio_completed; g_destroy_bio(bp); bp2->bio_inbed++; diff --git a/sys/geom/geom_vfs.c b/sys/geom/geom_vfs.c index 9b5e5a84191f..f074ac43d245 100644 --- a/sys/geom/geom_vfs.c +++ b/sys/geom/geom_vfs.c @@ -26,9 +26,11 @@ * SUCH DAMAGE. */ +#define EXTERR_CATEGORY EXTERR_CAT_GEOMVFS #include <sys/param.h> #include <sys/systm.h> #include <sys/bio.h> +#include <sys/exterrvar.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> @@ -156,10 +158,13 @@ g_vfs_done(struct bio *bip) " suppressing further ENXIO"); } } - bp->b_error = bip->bio_error; bp->b_ioflags = bip->bio_flags; if (bip->bio_error) bp->b_ioflags |= BIO_ERROR; + if ((bp->b_ioflags & BIO_EXTERR) != 0) + bp->b_exterr = bip->bio_exterr; + else + bp->b_error = bip->bio_error; bp->b_resid = bp->b_bcount - bip->bio_completed; g_destroy_bio(bip); diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index 19c39e42bafa..22b7fe8d059a 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -44,6 +44,7 @@ * see man buf(9) for more info. */ +#define EXTERR_CATEGORY EXTERR_CAT_VFSBIO #include <sys/param.h> #include <sys/systm.h> #include <sys/asan.h> @@ -55,6 +56,7 @@ #include <sys/counter.h> #include <sys/devicestat.h> #include <sys/eventhandler.h> +#include <sys/exterrvar.h> #include <sys/fail.h> #include <sys/ktr.h> #include <sys/limits.h> @@ -1775,7 +1777,6 @@ buf_alloc(struct bufdomain *bd) bp->b_blkno = bp->b_lblkno = 0; bp->b_offset = NOOFFSET; bp->b_iodone = 0; - bp->b_error = 0; bp->b_resid = 0; bp->b_bcount = 0; bp->b_npages = 0; @@ -1785,6 +1786,7 @@ buf_alloc(struct bufdomain *bd) bp->b_fsprivate1 = NULL; bp->b_fsprivate2 = NULL; bp->b_fsprivate3 = NULL; + exterr_clear(&bp->b_exterr); LIST_INIT(&bp->b_dep); return (bp); @@ -2276,7 +2278,7 @@ breadn_flags(struct vnode *vp, daddr_t blkno, daddr_t dblkno, int size, } if ((flags & GB_CVTENXIO) != 0) bp->b_xflags |= BX_CVTENXIO; - bp->b_ioflags &= ~BIO_ERROR; + bp->b_ioflags &= ~(BIO_ERROR | BIO_EXTERR); if (bp->b_rcred == NOCRED && cred != NOCRED) bp->b_rcred = crhold(cred); vfs_busy_pages(bp, 0); @@ -2353,7 +2355,7 @@ bufwrite(struct buf *bp) bundirty(bp); bp->b_flags &= ~B_DONE; - bp->b_ioflags &= ~BIO_ERROR; + bp->b_ioflags &= ~(BIO_ERROR | BIO_EXTERR); bp->b_flags |= B_CACHE; bp->b_iocmd = BIO_WRITE; @@ -4520,8 +4522,11 @@ biowait(struct bio *bp, const char *wmesg) while ((bp->bio_flags & BIO_DONE) == 0) msleep(bp, mtxp, PRIBIO, wmesg, 0); mtx_unlock(mtxp); - if (bp->bio_error != 0) + if (bp->bio_error != 0) { + if ((bp->bio_flags & BIO_EXTERR) != 0) + return (exterr_set_from(&bp->bio_exterr)); return (bp->bio_error); + } if (!(bp->bio_flags & BIO_ERROR)) return (0); return (EIO); @@ -4568,6 +4573,8 @@ bufwait(struct buf *bp) return (EINTR); } if (bp->b_ioflags & BIO_ERROR) { + if ((bp->b_ioflags & BIO_EXTERR) != 0) + exterr_set_from(&bp->b_exterr); return (bp->b_error ? bp->b_error : EIO); } else { return (0); diff --git a/sys/sys/bio.h b/sys/sys/bio.h index 74d2b03bd180..fa7f19961ebd 100644 --- a/sys/sys/bio.h +++ b/sys/sys/bio.h @@ -37,6 +37,7 @@ #ifndef _SYS_BIO_H_ #define _SYS_BIO_H_ +#include <sys/_exterr.h> #include <sys/queue.h> #include <sys/disk_zone.h> @@ -65,6 +66,7 @@ #define BIO_TRANSIENT_MAPPING 0x20 #define BIO_VLIST 0x40 #define BIO_SWAP 0x200 /* Swap-related I/O */ +#define BIO_EXTERR 0x2000 #define BIO_SPEEDUP_WRITE 0x4000 /* Resource shortage at upper layers */ #define BIO_SPEEDUP_TRIM 0x8000 /* Resource shortage at upper layers */ @@ -94,7 +96,6 @@ struct bio { 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; /* Errno for BIO_ERROR. */ long bio_resid; /* Remaining I/O in bytes. */ void (*bio_done)(struct bio *); void *bio_driver1; /* Private use by the provider. */ @@ -130,8 +131,12 @@ struct bio { /* XXX: these go away when bio chaining is introduced */ daddr_t bio_pblkno; /* physical block number */ + struct kexterr bio_exterr; }; +/* Errno for BIO_ERROR. */ +#define bio_error bio_exterr.error + struct uio; struct devstat; diff --git a/sys/sys/buf.h b/sys/sys/buf.h index 064d5cb05214..f08f05e6d50f 100644 --- a/sys/sys/buf.h +++ b/sys/sys/buf.h @@ -37,6 +37,7 @@ #ifndef _SYS_BUF_H_ #define _SYS_BUF_H_ +#include <sys/_exterr.h> #include <sys/bufobj.h> #include <sys/queue.h> #include <sys/lock.h> @@ -98,7 +99,6 @@ struct buf { long b_bcount; void *b_caller1; caddr_t b_data; - int b_error; uint16_t b_iocmd; /* BIO_* bio_cmd from bio.h */ uint16_t b_ioflags; /* BIO_* bio_flags from bio.h */ off_t b_iooffset; @@ -153,10 +153,12 @@ struct buf { #elif defined(BUF_TRACKING) const char *b_io_tracking; #endif + struct kexterr b_exterr; struct vm_page *b_pages[]; }; #define b_object b_bufobj->bo_object +#define b_error b_exterr.error /* * These flags are kept in b_flags. @@ -390,6 +392,12 @@ struct buf { _lockmgr_disown(&(bp)->b_lock, LOCK_FILE, LOCK_LINE) #endif +#define BUF_EXTERR_FROM_CURTHR(bp) \ + bp->b_exterr = curthread->td_kexterr + +#define BUF_EXTERR_TO_CURTHR(bp) \ + curthread->td_kexterr = bp->b_exterr + #endif /* _KERNEL */ struct buf_queue_head { diff --git a/sys/sys/exterr_cat.h b/sys/sys/exterr_cat.h index 43f31e1d5dd6..34a4b9f86694 100644 --- a/sys/sys/exterr_cat.h +++ b/sys/sys/exterr_cat.h @@ -21,6 +21,8 @@ #define EXTERR_CAT_BRIDGE 7 #define EXTERR_CAT_SWAP 8 #define EXTERR_CAT_VFSSYSCALL 9 +#define EXTERR_CAT_VFSBIO 10 +#define EXTERR_CAT_GEOMVFS 11 #endifhelp
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