Add a new I/O request - BIO_FLUSH, which basically tells providers below to
flush their caches. For now will mostly be used by disks to flush their write cache. Sponsored by: home.pl
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parent
cef5850ba0
commit
c3618c657a
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=163832
@ -268,6 +268,7 @@ struct bio * g_duplicate_bio(struct bio *);
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void g_destroy_bio(struct bio *);
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void g_io_deliver(struct bio *bp, int error);
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int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
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int g_io_flush(struct g_consumer *cp);
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void g_io_request(struct bio *bp, struct g_consumer *cp);
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struct bio *g_new_bio(void);
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struct bio *g_alloc_bio(void);
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@ -244,6 +244,26 @@ g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr)
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return (error);
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}
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int
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g_io_flush(struct g_consumer *cp)
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{
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struct bio *bp;
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int error;
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g_trace(G_T_BIO, "bio_flush(%s)", cp->provider->name);
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bp = g_alloc_bio();
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bp->bio_cmd = BIO_FLUSH;
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bp->bio_done = NULL;
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bp->bio_attribute = NULL;
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bp->bio_offset = cp->provider->mediasize;
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bp->bio_length = 0;
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bp->bio_data = NULL;
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g_io_request(bp, cp);
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error = biowait(bp, "gflush");
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g_destroy_bio(bp);
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return (error);
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}
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static int
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g_io_check(struct bio *bp)
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{
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@ -262,6 +282,7 @@ g_io_check(struct bio *bp)
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break;
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case BIO_WRITE:
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case BIO_DELETE:
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case BIO_FLUSH:
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if (cp->acw == 0)
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return (EPERM);
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break;
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@ -304,7 +325,6 @@ g_io_request(struct bio *bp, struct g_consumer *cp)
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KASSERT(cp != NULL, ("NULL cp in g_io_request"));
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KASSERT(bp != NULL, ("NULL bp in g_io_request"));
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KASSERT(bp->bio_data != NULL, ("NULL bp->data in g_io_request"));
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pp = cp->provider;
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KASSERT(pp != NULL, ("consumer not attached in g_io_request"));
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#ifdef DIAGNOSTIC
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@ -323,6 +343,10 @@ g_io_request(struct bio *bp, struct g_consumer *cp)
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bp->_bio_cflags = bp->bio_cflags;
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#endif
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if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_GETATTR)) {
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KASSERT(bp->bio_data != NULL,
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("NULL bp->data in g_io_request"));
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}
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if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) {
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KASSERT(bp->bio_offset % cp->provider->sectorsize == 0,
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("wrong offset %jd for sectorsize %u",
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@ -632,6 +656,10 @@ g_print_bio(struct bio *bp)
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cmd = "GETATTR";
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printf("%s[%s(attr=%s)]", pname, cmd, bp->bio_attribute);
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return;
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case BIO_FLUSH:
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cmd = "FLUSH";
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printf("%s[%s]", pname, cmd);
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return;
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case BIO_READ:
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cmd = "READ";
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case BIO_WRITE:
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@ -43,6 +43,7 @@ disk_err(struct bio *bp, const char *what, int blkdone, int nl)
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case BIO_WRITE: printf("cmd=write "); break;
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case BIO_DELETE: printf("cmd=delete "); break;
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case BIO_GETATTR: printf("cmd=getattr "); break;
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case BIO_FLUSH: printf("cmd=flush "); break;
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default: printf("cmd=%x ", bp->bio_cmd); break;
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}
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sn = bp->bio_pblkno;
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@ -93,6 +93,7 @@ struct bio {
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#define BIO_WRITE 0x02
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#define BIO_DELETE 0x04
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#define BIO_GETATTR 0x08
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#define BIO_FLUSH 0x10
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#define BIO_CMD0 0x20 /* Available for local hacks */
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#define BIO_CMD1 0x40 /* Available for local hacks */
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#define BIO_CMD2 0x80 /* Available for local hacks */
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