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in getnewbuf(), when we need to write a buffer before reusing it, 

return NULL instead of restarting the loop since we might sleep
while starting the i/o.  this tells getblk() to check if someone else
created the buffer while we slept.  from OpenBSD.
This commit is contained in:
chs 2001-03-10 18:43:55 +00:00
parent 63f7d31eeb
commit 941da355cf
1 changed files with 6 additions and 3 deletions
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9
sys/kern/vfs_bio.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_bio.c,v 1.74 2000/12/13 17:48:46 jdolecek Exp $ */ /* $NetBSD: vfs_bio.c,v 1.75 2001/03/10 18:43:55 chs Exp $ */
/*- /*-
* Copyright (c) 1994 Christopher G. Demetriou * Copyright (c) 1994 Christopher G. Demetriou
@ -830,7 +830,10 @@ start:
/* Buffer is no longer on free lists. */ /* Buffer is no longer on free lists. */
SET(bp->b_flags, B_BUSY); SET(bp->b_flags, B_BUSY);
/* If buffer was a delayed write, start it, and go back to the top. */ /*
* If buffer was a delayed write, start it and return NULL
* (since we might sleep while starting the write).
*/
if (ISSET(bp->b_flags, B_DELWRI)) { if (ISSET(bp->b_flags, B_DELWRI)) {
splx(s); splx(s);
/* /*
@ -839,7 +842,7 @@ start:
*/ */
SET(bp->b_flags, B_AGE); SET(bp->b_flags, B_AGE);
bawrite(bp); bawrite(bp);
goto start; return (NULL);
} }
/* disassociate us from our vnode, if we had one... */ /* disassociate us from our vnode, if we had one... */