diff options
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/vfs_bio.c | 72 |
1 files changed, 68 insertions, 4 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index 97be296ac4d..27d8a10fd33 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -1,4 +1,4 @@ -/* $OpenBSD: vfs_bio.c,v 1.45 2001/10/11 14:44:10 art Exp $ */ +/* $OpenBSD: vfs_bio.c,v 1.46 2001/10/28 00:42:43 art Exp $ */ /* $NetBSD: vfs_bio.c,v 1.44 1996/06/11 11:15:36 pk Exp $ */ /*- @@ -524,6 +524,8 @@ brelse(bp) /* Block disk interrupts. */ s = splbio(); + KASSERT(ISSET(bp->b_flags, B_BUSY)); + /* * Determine which queue the buffer should be on, then put it there. */ @@ -757,6 +759,7 @@ allocbuf(bp, size) if (bp->b_bufsize == desired_size) goto out; + KASSERT(!ISSET(bp->b_flags, (B_CACHE|B_DONE|B_DELWRI))); /* * If the buffer is smaller than the desired size, we need to snarf * it from other buffers. Get buffers (via getnewbuf()), and @@ -797,7 +800,7 @@ allocbuf(bp, size) */ if (bp->b_bufsize > desired_size) { s = splbio(); - if ((nbp = bufqueues[BQ_EMPTY].tqh_first) == NULL) { + if ((nbp = TAILQ_FIRST(&bufqueues[BQ_EMPTY])) == NULL) { /* No free buffer head */ splx(s); goto out; @@ -873,6 +876,8 @@ start: bremfree(bp); + KASSERT(!ISSET(bp->b_flags, B_BUSY)); + /* Buffer is no longer on free lists. */ SET(bp->b_flags, B_BUSY); @@ -1041,9 +1046,11 @@ biodone(bp) CLR(bp->b_flags, B_CALL); /* but note callout done */ (*bp->b_iodone)(bp); } else { - if (ISSET(bp->b_flags, B_ASYNC)) {/* if async, release it */ + if (ISSET(bp->b_flags, B_ASYNC)) { + /* if async, release it */ brelse(bp); - } else { /* or just wakeup the buffer */ + } else { + /* or just wakeup the buffer */ CLR(bp->b_flags, B_WANTED); wakeup(bp); } @@ -1052,6 +1059,63 @@ biodone(bp) #ifdef DEBUG /* + * Print as much as possible about a buffer. + */ +void +buf_print(struct buf *bp) +{ + int f = 1; + +#define FLAG(fl) if (bp->b_flags & (fl)) { if (!f) printf(", "); else f = 0; printf(#fl); } + + printf("b_proc: %p\n", bp->b_proc); + printf("b_error: %d\n", bp->b_error); + printf("b_bufsize: %ld\n", bp->b_bufsize); + printf("b_bcount: %ld\n", bp->b_bcount); + printf("b_resid: %ld\n", (long)bp->b_resid); + printf("b_dev: (%d,%d)\n", minor(bp->b_dev), major(bp->b_dev)); + printf("b_data: %p\n", bp->b_data); + printf("b_blkno: %ld\n", (long)bp->b_blkno); + printf("b_lblkno: %ld\n", (long)bp->b_lblkno); + + printf("b_flags: "); + + FLAG(B_AGE); + FLAG(B_NEEDCOMMIT); + FLAG(B_ASYNC); + FLAG(B_BAD); + FLAG(B_BUSY); + FLAG(B_CACHE); + FLAG(B_CALL); + FLAG(B_DELWRI); + FLAG(B_DIRTY); + FLAG(B_DONE); + FLAG(B_EINTR); + FLAG(B_ERROR); + FLAG(B_GATHERED); + FLAG(B_INVAL); + FLAG(B_LOCKED); + FLAG(B_NOCACHE); + FLAG(B_PAGET); + FLAG(B_PGIN); + FLAG(B_PHYS); + FLAG(B_RAW); + FLAG(B_READ); + FLAG(B_TAPE); + FLAG(B_UAREA); + FLAG(B_WANTED); + FLAG(B_WRITE); + FLAG(B_WRITEINPROG); + FLAG(B_XXX); + FLAG(B_DEFERRED); + FLAG(B_SCANNED); + + printf("\n"); + +#undef FLAG +} + +/* * Print out statistics on the current allocation of the buffer pool. * Can be enabled to print out on every ``sync'' by setting "syncprt" * in vfs_syscalls.c using sysctl. |