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| author | luoqi <luoqi@FreeBSD.org> | 1999-09-03 17:49:25 +0000 |
|---|---|---|
| committer | luoqi <luoqi@FreeBSD.org> | 1999-09-03 17:49:25 +0000 |
| commit | dfe06dcb7dab9702d70ebfc05107600f1cd2d1a4 (patch) | |
| tree | 5a4398551bc2e1496f0f019564bcbb86fdfc478d /sys/kern/vfs_bio.c | |
| parent | 7d240ed5811f23450d10fd4d4c6eb1e1a3459dde (diff) | |
| download | FreeBSD-src-dfe06dcb7dab9702d70ebfc05107600f1cd2d1a4.zip FreeBSD-src-dfe06dcb7dab9702d70ebfc05107600f1cd2d1a4.tar.gz | |
Allow getblk() to be called from an idle context (by panic() inside
an interrupt handler).
Reviewed by: dillon
Diffstat (limited to 'sys/kern/vfs_bio.c')
| -rw-r--r-- | sys/kern/vfs_bio.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index 6b03775..2f8f85a 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -1374,7 +1374,7 @@ restart: dbp = NULL; outofspace = 0; if (bufspace >= hibufspace) { - if ((curproc->p_flag & P_BUFEXHAUST) == 0 || + if ((curproc && (curproc->p_flag & P_BUFEXHAUST) == 0) || bufspace >= maxbufspace) { outofspace = 1; if (defrag > 0) @@ -1406,7 +1406,7 @@ restart: * constantly out of space or in need of defragmentation. */ - if ((curproc->p_flag & P_BUFEXHAUST) == 0 && + if (curproc && (curproc->p_flag & P_BUFEXHAUST) == 0 && numfreebuffers < lofreebuffers) { nqindex = QUEUE_CLEAN; nbp = NULL; @@ -1992,9 +1992,15 @@ loop: /* * Block if we are low on buffers. Certain processes are allowed * to completely exhaust the buffer cache. - */ - if (curproc->p_flag & P_BUFEXHAUST) { + * + * If this check ever becomes a bottleneck it may be better to + * move it into the else, when gbincore() fails. At the moment + * it isn't a problem. + */ + if (!curproc || (curproc->p_flag & P_BUFEXHAUST)) { if (numfreebuffers == 0) { + if (!curproc) + return NULL; needsbuffer |= VFS_BIO_NEED_ANY; tsleep(&needsbuffer, (PRIBIO + 4) | slpflag, "newbuf", slptimeo); |
