Only set B_RAM (Read ahead mark) on an incore buffers if we can lock it.
This fixes a race condition caused by the unlocked write access to the b_flags field. MFC after: 3 days
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4339c67c48
commit
198b0a3b71
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=151621
@ -142,11 +142,16 @@ cluster_read(vp, filesize, lblkno, size, cred, totread, seqcount, bpp)
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/*
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* Set another read-ahead mark so we know
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* to check again.
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* to check again. (If we can lock the
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* buffer without waiting)
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*/
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if (((i % racluster) == (racluster - 1)) ||
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(i == (maxra - 1)))
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if ((((i % racluster) == (racluster - 1)) ||
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(i == (maxra - 1)))
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&& (0 == BUF_LOCK(rbp,
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LK_EXCLUSIVE | LK_NOWAIT, NULL))) {
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rbp->b_flags |= B_RAM;
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BUF_UNLOCK(rbp);
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}
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}
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VI_UNLOCK(vp);
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if (i >= maxra) {
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