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- Lock bufs before inspecting their flags.

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This commit is contained in:
Jeff Roberson 2003-03-13 07:05:22 +00:00
parent 619bddc702
commit c033bdc013
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=112179
1 changed files with 9 additions and 6 deletions
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15
sys/nfsserver/nfs_serv.c
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@ -3701,17 +3701,20 @@ nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
* should not be set if B_INVAL is set there could be
* a race here since we haven't locked the buffer).
*/
if ((bp = gbincore(vp, lblkno)) != NULL &&
(bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI) {
if ((bp = gbincore(vp, lblkno)) != NULL) {
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
LK_INTERLOCK, VI_MTX(vp)) == ENOLCK) {
VI_LOCK(vp);
continue; /* retry */
}
bremfree(bp);
bp->b_flags &= ~B_ASYNC;
BUF_WRITE(bp);
++nfs_commit_miss;
if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
B_DELWRI) {
bremfree(bp);
bp->b_flags &= ~B_ASYNC;
BUF_WRITE(bp);
++nfs_commit_miss;
} else
BUF_UNLOCK(bp);
VI_LOCK(vp);
}
++nfs_commit_blks;