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- We are not guaranteed that read ahead blocks are not in memory already.

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Check for B_DELWRI as well as B_CACHED before issuing io on a buffer.  This
   is especially important since we are changing the b_iocmd.
This commit is contained in:
Jeff Roberson 2003-03-30 02:57:32 +00:00
parent de54353fb8
commit abb0e6da6b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=112838
1 changed files with 9 additions and 1 deletions
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10
sys/kern/vfs_cluster.c
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@ -264,12 +264,20 @@ cluster_read(vp, filesize, lblkno, size, cred, totread, seqcount, bpp)
rbp = cluster_rbuild(vp, filesize, lblkno, blkno,
size, ncontig, NULL);
lblkno += (rbp->b_bufsize / size);
if (rbp->b_flags & B_DELWRI) {
bqrelse(rbp);
continue;
}
} else {
rbp = getblk(vp, lblkno, size, 0, 0, 0);
lblkno += 1;
if (rbp->b_flags & B_DELWRI) {
bqrelse(rbp);
continue;
}
rbp->b_flags |= B_ASYNC | B_RAM;
rbp->b_iocmd = BIO_READ;
rbp->b_blkno = blkno;
lblkno += 1;
}
if (rbp->b_flags & B_CACHE) {
rbp->b_flags &= ~B_ASYNC;