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- Log -----------------------------------------------------------------
commit 8c73b983408ca5d1949b849e3912fc8a5b92760d
Author: Jonathan Brassow <jbrassow@redhat.com>
Date: Fri May 2 17:09:45 2008 -0500

clogd: Fix a number of issues with sync_bits accounting

1) Was writing wrong bitset to disk! Write clean_bits to
disk, not sync_bits. (sync_bits gets copied from
clean_bits upon resume/read.)

2) Was counting bits in clean_bits instead of sync_bits
after a resume. While this is fine for the first
machine in the cluster (because clean gets copied
to sync), it is _not_ ok for everyone else. This
is because as the mirror ages, the sync and clean
bitsets diverge; and the mirror will have aged some
by the time the other machines join in.

3) Completely missed setting sync_count when corelog
was used.

-----------------------------------------------------------------------

Summary of changes:
cmirror/src/functions.c | 18 +++++++-----------
1 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/cmirror/src/functions.c b/cmirror/src/functions.c
index 9756136..2c917d2 100644
--- a/cmirror/src/functions.c
+++ b/cmirror/src/functions.c
@@ -219,7 +219,7 @@ static int rw_log(struct log_c *lc, int do_write)
* Valid return codes:
* -EINVAL: Invalid header, bits not copied
* -EIO: Unable to read disk log
- * 0: Valid header, disk bit -> lc->sync_bits
+ * 0: Valid header, disk bit -> lc->clean_bits
*
* Returns: 0 on success, -EXXX on failure
*/
@@ -275,7 +275,7 @@ static int write_log(struct log_c *lc)
/* Write disk bits from clean_bits */
bitset_size = lc->region_count / 8;
bitset_size += (lc->region_count % 8) ? 1 : 0;
- memcpy(lc->disk_buffer + 1024, lc->sync_bits, bitset_size);
+ memcpy(lc->disk_buffer + 1024, lc->clean_bits, bitset_size);

if (rw_log(lc, 1)) {
lc->log_dev_failed = 1;
@@ -720,12 +720,8 @@ static int clog_resume(struct clog_tfr *tfr)
return -EINVAL;
case 3:
LOG_DBG("[%s] Non-master resume: bits pre-loaded",
- SHORT_UUID(lc->uuid));
+ SHORT_UUID(lc->uuid));
lc->resume_override = 1000;
- lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count);
- LOG_DBG("[%s] Initial sync_count = %llu",
- SHORT_UUID(lc->uuid),
- (unsigned long long)lc->sync_count);
goto out;
default:
LOG_ERROR("Error:: multiple loading of bits (%d)", lc->resume_override);
@@ -773,10 +769,6 @@ static int clog_resume(struct clog_tfr *tfr)

/* copy clean across to sync */
memcpy(lc->sync_bits, lc->clean_bits, size);
- lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count);
- LOG_DBG("[%s] Initial sync_count = %llu",
- SHORT_UUID(lc->uuid), (unsigned long long)lc->sync_count);
- lc->sync_search = 0;

if (commit_log && (lc->disk_fd >= 0)) {
tfr->error = write_log(lc);
@@ -787,6 +779,10 @@ static int clog_resume(struct clog_tfr *tfr)
lc->touched = 0;
}
out:
+ lc->sync_count = count_bits32(lc->sync_bits, lc->bitset_uint32_count);
+ LOG_DBG("[%s] Initial sync_count = %llu",
+ SHORT_UUID(lc->uuid), (unsigned long long)lc->sync_count);
+ lc->sync_search = 0;
lc->state = LOG_RESUMED;
lc->recovery_halted = 0;



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