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dm writecache: return the exact table values that were set
commit 054bee1616
upstream.
LVM doesn't like it when the target returns different values from what
was set in the constructor. Fix dm-writecache so that the returned
table values are exactly the same as requested values.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # v4.18+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
8a85afc662
commit
d73c180e6a
1 changed files with 16 additions and 16 deletions
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@ -154,6 +154,7 @@ struct dm_writecache {
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bool overwrote_committed:1;
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bool memory_vmapped:1;
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bool start_sector_set:1;
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bool high_wm_percent_set:1;
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bool low_wm_percent_set:1;
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bool max_writeback_jobs_set:1;
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@ -162,6 +163,10 @@ struct dm_writecache {
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bool writeback_fua_set:1;
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bool flush_on_suspend:1;
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unsigned high_wm_percent_value;
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unsigned low_wm_percent_value;
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unsigned autocommit_time_value;
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unsigned writeback_all;
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struct workqueue_struct *writeback_wq;
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struct work_struct writeback_work;
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@ -2069,6 +2074,7 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv)
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if (sscanf(string, "%llu%c", &start_sector, &dummy) != 1)
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goto invalid_optional;
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wc->start_sector = start_sector;
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wc->start_sector_set = true;
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if (wc->start_sector != start_sector ||
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wc->start_sector >= wc->memory_map_size >> SECTOR_SHIFT)
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goto invalid_optional;
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@ -2078,6 +2084,7 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv)
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goto invalid_optional;
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if (high_wm_percent < 0 || high_wm_percent > 100)
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goto invalid_optional;
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wc->high_wm_percent_value = high_wm_percent;
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wc->high_wm_percent_set = true;
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} else if (!strcasecmp(string, "low_watermark") && opt_params >= 1) {
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string = dm_shift_arg(&as), opt_params--;
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@ -2085,6 +2092,7 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv)
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goto invalid_optional;
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if (low_wm_percent < 0 || low_wm_percent > 100)
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goto invalid_optional;
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wc->low_wm_percent_value = low_wm_percent;
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wc->low_wm_percent_set = true;
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} else if (!strcasecmp(string, "writeback_jobs") && opt_params >= 1) {
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string = dm_shift_arg(&as), opt_params--;
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@ -2104,6 +2112,7 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv)
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if (autocommit_msecs > 3600000)
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goto invalid_optional;
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wc->autocommit_jiffies = msecs_to_jiffies(autocommit_msecs);
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wc->autocommit_time_value = autocommit_msecs;
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wc->autocommit_time_set = true;
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} else if (!strcasecmp(string, "fua")) {
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if (WC_MODE_PMEM(wc)) {
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@ -2305,7 +2314,6 @@ static void writecache_status(struct dm_target *ti, status_type_t type,
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struct dm_writecache *wc = ti->private;
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unsigned extra_args;
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unsigned sz = 0;
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uint64_t x;
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switch (type) {
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case STATUSTYPE_INFO:
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@ -2317,7 +2325,7 @@ static void writecache_status(struct dm_target *ti, status_type_t type,
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DMEMIT("%c %s %s %u ", WC_MODE_PMEM(wc) ? 'p' : 's',
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wc->dev->name, wc->ssd_dev->name, wc->block_size);
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extra_args = 0;
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if (wc->start_sector)
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if (wc->start_sector_set)
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extra_args += 2;
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if (wc->high_wm_percent_set)
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extra_args += 2;
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@ -2333,26 +2341,18 @@ static void writecache_status(struct dm_target *ti, status_type_t type,
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extra_args++;
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DMEMIT("%u", extra_args);
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if (wc->start_sector)
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if (wc->start_sector_set)
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DMEMIT(" start_sector %llu", (unsigned long long)wc->start_sector);
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if (wc->high_wm_percent_set) {
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x = (uint64_t)wc->freelist_high_watermark * 100;
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x += wc->n_blocks / 2;
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do_div(x, (size_t)wc->n_blocks);
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DMEMIT(" high_watermark %u", 100 - (unsigned)x);
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}
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if (wc->low_wm_percent_set) {
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x = (uint64_t)wc->freelist_low_watermark * 100;
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x += wc->n_blocks / 2;
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do_div(x, (size_t)wc->n_blocks);
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DMEMIT(" low_watermark %u", 100 - (unsigned)x);
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}
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if (wc->high_wm_percent_set)
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DMEMIT(" high_watermark %u", wc->high_wm_percent_value);
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if (wc->low_wm_percent_set)
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DMEMIT(" low_watermark %u", wc->low_wm_percent_value);
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if (wc->max_writeback_jobs_set)
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DMEMIT(" writeback_jobs %u", wc->max_writeback_jobs);
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if (wc->autocommit_blocks_set)
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DMEMIT(" autocommit_blocks %u", wc->autocommit_blocks);
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if (wc->autocommit_time_set)
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DMEMIT(" autocommit_time %u", jiffies_to_msecs(wc->autocommit_jiffies));
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DMEMIT(" autocommit_time %u", wc->autocommit_time_value);
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if (wc->writeback_fua_set)
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DMEMIT(" %sfua", wc->writeback_fua ? "" : "no");
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break;
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