Date: Tue, 18 Feb 2014 15:18:22 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r262172 - stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201402181518.s1IFIMUA005247@svn.freebsd.org>
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Author: avg Date: Tue Feb 18 15:18:21 2014 New Revision: 262172 URL: http://svnweb.freebsd.org/changeset/base/262172 Log: MFC r254757: MFV r254749: 4046 dsl_dataset_t ds_dir->dd_lock is highly contended Modified: stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/cddl/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) Modified: stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c ============================================================================== --- stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Tue Feb 18 15:18:08 2014 (r262171) +++ stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c Tue Feb 18 15:18:21 2014 (r262172) @@ -101,9 +101,8 @@ dsl_dataset_block_born(dsl_dataset_t *ds used, compressed, uncompressed); return; } - dmu_buf_will_dirty(ds->ds_dbuf, tx); - mutex_enter(&ds->ds_dir->dd_lock); + dmu_buf_will_dirty(ds->ds_dbuf, tx); mutex_enter(&ds->ds_lock); delta = parent_delta(ds, used); ds->ds_phys->ds_referenced_bytes += used; @@ -115,7 +114,6 @@ dsl_dataset_block_born(dsl_dataset_t *ds compressed, uncompressed, tx); dsl_dir_transfer_space(ds->ds_dir, used - delta, DD_USED_REFRSRV, DD_USED_HEAD, tx); - mutex_exit(&ds->ds_dir->dd_lock); } int @@ -150,7 +148,6 @@ dsl_dataset_block_kill(dsl_dataset_t *ds dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); dsl_free(tx->tx_pool, tx->tx_txg, bp); - mutex_enter(&ds->ds_dir->dd_lock); mutex_enter(&ds->ds_lock); ASSERT(ds->ds_phys->ds_unique_bytes >= used || !DS_UNIQUE_IS_ACCURATE(ds)); @@ -161,7 +158,6 @@ dsl_dataset_block_kill(dsl_dataset_t *ds delta, -compressed, -uncompressed, tx); dsl_dir_transfer_space(ds->ds_dir, -used - delta, DD_USED_REFRSRV, DD_USED_HEAD, tx); - mutex_exit(&ds->ds_dir->dd_lock); } else { dprintf_bp(bp, "putting on dead list: %s", ""); if (async) { @@ -596,31 +592,6 @@ dsl_dataset_name(dsl_dataset_t *ds, char } } -static int -dsl_dataset_namelen(dsl_dataset_t *ds) -{ - int result; - - if (ds == NULL) { - result = 3; /* "mos" */ - } else { - result = dsl_dir_namelen(ds->ds_dir); - VERIFY0(dsl_dataset_get_snapname(ds)); - if (ds->ds_snapname[0]) { - ++result; /* adding one for the @-sign */ - if (!MUTEX_HELD(&ds->ds_lock)) { - mutex_enter(&ds->ds_lock); - result += strlen(ds->ds_snapname); - mutex_exit(&ds->ds_lock); - } else { - result += strlen(ds->ds_snapname); - } - } - } - - return (result); -} - void dsl_dataset_rele(dsl_dataset_t *ds, void *tag) { Modified: stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c ============================================================================== --- stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c Tue Feb 18 15:18:08 2014 (r262171) +++ stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dir.c Tue Feb 18 15:18:21 2014 (r262172) @@ -836,11 +836,21 @@ dsl_dir_diduse_space(dsl_dir_t *dd, dd_u int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx) { int64_t accounted_delta; + + /* + * dsl_dataset_set_refreservation_sync_impl() calls this with + * dd_lock held, so that it can atomically update + * ds->ds_reserved and the dsl_dir accounting, so that + * dsl_dataset_check_quota() can see dataset and dir accounting + * consistently. + */ boolean_t needlock = !MUTEX_HELD(&dd->dd_lock); ASSERT(dmu_tx_is_syncing(tx)); ASSERT(type < DD_USED_NUM); + dmu_buf_will_dirty(dd->dd_dbuf, tx); + if (needlock) mutex_enter(&dd->dd_lock); accounted_delta = parent_delta(dd, dd->dd_phys->dd_used_bytes, used); @@ -849,7 +859,6 @@ dsl_dir_diduse_space(dsl_dir_t *dd, dd_u dd->dd_phys->dd_compressed_bytes >= -compressed); ASSERT(uncompressed >= 0 || dd->dd_phys->dd_uncompressed_bytes >= -uncompressed); - dmu_buf_will_dirty(dd->dd_dbuf, tx); dd->dd_phys->dd_used_bytes += used; dd->dd_phys->dd_uncompressed_bytes += uncompressed; dd->dd_phys->dd_compressed_bytes += compressed; @@ -882,8 +891,6 @@ void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta, dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx) { - boolean_t needlock = !MUTEX_HELD(&dd->dd_lock); - ASSERT(dmu_tx_is_syncing(tx)); ASSERT(oldtype < DD_USED_NUM); ASSERT(newtype < DD_USED_NUM); @@ -891,17 +898,15 @@ dsl_dir_transfer_space(dsl_dir_t *dd, in if (delta == 0 || !(dd->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN)) return; - if (needlock) - mutex_enter(&dd->dd_lock); + dmu_buf_will_dirty(dd->dd_dbuf, tx); + mutex_enter(&dd->dd_lock); ASSERT(delta > 0 ? dd->dd_phys->dd_used_breakdown[oldtype] >= delta : dd->dd_phys->dd_used_breakdown[newtype] >= -delta); ASSERT(dd->dd_phys->dd_used_bytes >= ABS(delta)); - dmu_buf_will_dirty(dd->dd_dbuf, tx); dd->dd_phys->dd_used_breakdown[oldtype] -= delta; dd->dd_phys->dd_used_breakdown[newtype] += delta; - if (needlock) - mutex_exit(&dd->dd_lock); + mutex_exit(&dd->dd_lock); } typedef struct dsl_dir_set_qr_arg {
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