From 01d03a660e73fb524957c09825a3eb7c2ae7c205 Mon Sep 17 00:00:00 2001 From: Jonathan E Brassow Date: Wed, 9 May 2007 02:32:57 -0700 Subject: dm log: fault detection This patch gives the disk logging code the ability to store the fact that an error occured on the log device. In addition, an event is raised when an error is encountered during I/O to the log device. Signed-off-by: Jonathan E Brassow Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/dm-log.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c index 6a926135184..a503d12c2ff 100644 --- a/drivers/md/dm-log.c +++ b/drivers/md/dm-log.c @@ -152,6 +152,7 @@ struct log_c { /* * Disk log fields */ + int log_dev_failed; struct dm_dev *log_dev; struct log_header header; @@ -315,6 +316,7 @@ static int create_log_context(struct dirty_log *log, struct dm_target *ti, lc->disk_header = NULL; } else { lc->log_dev = dev; + lc->log_dev_failed = 0; lc->header_location.bdev = lc->log_dev->bdev; lc->header_location.sector = 0; @@ -437,6 +439,15 @@ static int count_bits32(uint32_t *addr, unsigned size) return count; } +static void fail_log_device(struct log_c *lc) +{ + if (lc->log_dev_failed) + return; + + lc->log_dev_failed = 1; + dm_table_event(lc->ti->table); +} + static int disk_resume(struct dirty_log *log) { int r; @@ -446,8 +457,12 @@ static int disk_resume(struct dirty_log *log) /* read the disk header */ r = read_header(lc); - if (r) + if (r) { + DMWARN("%s: Failed to read header on mirror log device", + lc->log_dev->name); + fail_log_device(lc); return r; + } /* set or clear any new bits -- device has grown */ if (lc->sync == NOSYNC) @@ -472,7 +487,14 @@ static int disk_resume(struct dirty_log *log) lc->header.nr_regions = lc->region_count; /* write the new header */ - return write_header(lc); + r = write_header(lc); + if (r) { + DMWARN("%s: Failed to write header on mirror log device", + lc->log_dev->name); + fail_log_device(lc); + } + + return r; } static uint32_t core_get_region_size(struct dirty_log *log) @@ -516,7 +538,9 @@ static int disk_flush(struct dirty_log *log) return 0; r = write_header(lc); - if (!r) + if (r) + fail_log_device(lc); + else lc->touched = 0; return r; -- cgit v1.2.3