diff options
author | delphij <delphij@FreeBSD.org> | 2009-12-19 11:43:39 +0000 |
---|---|---|
committer | delphij <delphij@FreeBSD.org> | 2009-12-19 11:43:39 +0000 |
commit | 3cc7b7e8fb55b4f130d3395b733137304708d301 (patch) | |
tree | 562cbd7b999d9ef6a9f9e7172b4c40b56ae0833b /sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c | |
parent | 6d8f8050bf9d7cacd62498b78f7ed2b89002d798 (diff) | |
download | FreeBSD-src-3cc7b7e8fb55b4f130d3395b733137304708d301.zip FreeBSD-src-3cc7b7e8fb55b4f130d3395b733137304708d301.tar.gz |
Apply fix Solaris bug 6462803 zfs snapshot -r failed because
filesystem was busy.
Submitted by: mm
Approved by: pjd
MFC after: 2 weeks
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c')
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c | 57 |
1 files changed, 36 insertions, 21 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c index a7c2b37..4455fb8 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c @@ -502,6 +502,25 @@ zil_rollback_destroy(zilog_t *zilog, dmu_tx_t *tx) tx, zh->zh_claim_txg); } +/* + * return true if the initial log block is not valid + */ +static boolean_t +zil_empty(zilog_t *zilog) +{ + const zil_header_t *zh = zilog->zl_header; + arc_buf_t *abuf = NULL; + + if (BP_IS_HOLE(&zh->zh_log)) + return (B_TRUE); + + if (zil_read_log_block(zilog, &zh->zh_log, &abuf) != 0) + return (B_TRUE); + + VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); + return (B_FALSE); +} + int zil_claim(char *osname, void *txarg) { @@ -522,6 +541,21 @@ zil_claim(char *osname, void *txarg) zh = zil_header_in_syncing_context(zilog); /* + * Record here whether the zil has any records to replay. + * If the header block pointer is null or the block points + * to the stubby then we know there are no valid log records. + * We use the header to store this state as the the zilog gets + * freed later in dmu_objset_close(). + * The flags (and the rest of the header fields) are cleared in + * zil_sync() as a result of a zil_destroy(), after replaying the log. + * + * Note, the intent log can be empty but still need the + * stubby to be claimed. + */ + if (!zil_empty(zilog)) + zh->zh_flags |= ZIL_REPLAY_NEEDED; + + /* * Claim all log blocks if we haven't already done so, and remember * the highest claimed sequence number. This ensures that if we can * read only part of the log now (e.g. due to a missing device), @@ -1345,25 +1379,6 @@ zil_free(zilog_t *zilog) } /* - * return true if the initial log block is not valid - */ -static boolean_t -zil_empty(zilog_t *zilog) -{ - const zil_header_t *zh = zilog->zl_header; - arc_buf_t *abuf = NULL; - - if (BP_IS_HOLE(&zh->zh_log)) - return (B_TRUE); - - if (zil_read_log_block(zilog, &zh->zh_log, &abuf) != 0) - return (B_TRUE); - - VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1); - return (B_FALSE); -} - -/* * Open an intent log. */ zilog_t * @@ -1418,7 +1433,7 @@ zil_suspend(zilog_t *zilog) const zil_header_t *zh = zilog->zl_header; mutex_enter(&zilog->zl_lock); - if (zh->zh_claim_txg != 0) { /* unplayed log */ + if (zh->zh_flags & ZIL_REPLAY_NEEDED) { /* unplayed log */ mutex_exit(&zilog->zl_lock); return (EBUSY); } @@ -1645,7 +1660,7 @@ zil_replay(objset_t *os, void *arg, uint64_t *txgp, const zil_header_t *zh = zilog->zl_header; zil_replay_arg_t zr; - if (zil_empty(zilog)) { + if ((zh->zh_flags & ZIL_REPLAY_NEEDED) == 0) { zil_destroy(zilog, B_TRUE); return; } |