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Use MUTEX_FSTRANS mutex type
There are regions in the ZFS code where it is desirable to be able to be set PF_FSTRANS while a specific mutex is held. The ZFS code could be updated to set/clear this flag in all the correct places, but this is undesirable for a few reasons. 1) It would require changes to a significant amount of the ZFS code. This would complicate applying patches from upstream. 2) It would be easy to accidentally miss a critical region in the initial patch or to have an future change introduce a new one. Both of these concerns can be addressed by using a new mutex type which is responsible for managing PF_FSTRANS, support for which was added to the SPL in commit zfsonlinux/spl@9099312 - Merge branch 'kmem-rework'. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #3050 Closes #3055 Closes #3062 Closes #3132 Closes #3142 Closes #2983
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@ -273,6 +273,7 @@ typedef struct kmutex {
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} kmutex_t;
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#define MUTEX_DEFAULT 0
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#define MUTEX_FSTRANS MUTEX_DEFAULT
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#define MUTEX_HELD(m) ((m)->m_owner == curthread)
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#define MUTEX_NOT_HELD(m) (!MUTEX_HELD(m))
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@ -928,7 +928,7 @@ retry:
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for (i = 0; i < BUF_LOCKS; i++) {
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mutex_init(&buf_hash_table.ht_locks[i].ht_lock,
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NULL, MUTEX_DEFAULT, NULL);
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NULL, MUTEX_FSTRANS, NULL);
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}
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}
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@ -331,7 +331,7 @@ retry:
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0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0);
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for (i = 0; i < DBUF_MUTEXES; i++)
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mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL);
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mutex_init(&h->hash_mutexes[i], NULL, MUTEX_FSTRANS, NULL);
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dbuf_stats_init(h);
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}
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