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Allow getblk() to be called from an idle context (by panic() inside

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an interrupt handler).

Reviewed by:	dillon
This commit is contained in:
Luoqi Chen 1999-09-03 17:49:25 +00:00
parent 33f9210c19
commit d8a31f810f
1 changed files with 10 additions and 4 deletions
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14
sys/kern/vfs_bio.c
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@ -1374,7 +1374,7 @@ getnewbuf(int slpflag, int slptimeo, int size, int maxsize)
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 @@ getnewbuf(int slpflag, int slptimeo, int size, int maxsize)
* 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 @@ getblk(struct vnode * vp, daddr_t blkno, int size, int slpflag, int slptimeo)
/*
* 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);