diff options
Diffstat (limited to 'drivers/md/dm-table.c')
| -rw-r--r-- | drivers/md/dm-table.c | 88 |
1 files changed, 47 insertions, 41 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index e76ed003769e1..061152a437300 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1014,15 +1014,16 @@ static int dm_table_build_index(struct dm_table *t) return r; } +static bool integrity_profile_exists(struct gendisk *disk) +{ + return !!blk_get_integrity(disk); +} + /* * Get a disk whose integrity profile reflects the table's profile. - * If %match_all is true, all devices' profiles must match. - * If %match_all is false, all devices must at least have an - * allocated integrity profile; but uninitialized is ok. * Returns NULL if integrity support was inconsistent or unavailable. */ -static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t, - bool match_all) +static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t) { struct list_head *devices = dm_table_get_devices(t); struct dm_dev_internal *dd = NULL; @@ -1030,10 +1031,8 @@ static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t, list_for_each_entry(dd, devices, list) { template_disk = dd->dm_dev->bdev->bd_disk; - if (!blk_get_integrity(template_disk)) + if (!integrity_profile_exists(template_disk)) goto no_integrity; - if (!match_all && !blk_integrity_is_initialized(template_disk)) - continue; /* skip uninitialized profiles */ else if (prev_disk && blk_integrity_compare(prev_disk, template_disk) < 0) goto no_integrity; @@ -1052,34 +1051,40 @@ no_integrity: } /* - * Register the mapped device for blk_integrity support if - * the underlying devices have an integrity profile. But all devices - * may not have matching profiles (checking all devices isn't reliable + * Register the mapped device for blk_integrity support if the + * underlying devices have an integrity profile. But all devices may + * not have matching profiles (checking all devices isn't reliable * during table load because this table may use other DM device(s) which - * must be resumed before they will have an initialized integity profile). - * Stacked DM devices force a 2 stage integrity profile validation: - * 1 - during load, validate all initialized integrity profiles match - * 2 - during resume, validate all integrity profiles match + * must be resumed before they will have an initialized integity + * profile). Consequently, stacked DM devices force a 2 stage integrity + * profile validation: First pass during table load, final pass during + * resume. */ -static int dm_table_prealloc_integrity(struct dm_table *t, struct mapped_device *md) +static int dm_table_register_integrity(struct dm_table *t) { + struct mapped_device *md = t->md; struct gendisk *template_disk = NULL; - template_disk = dm_table_get_integrity_disk(t, false); + template_disk = dm_table_get_integrity_disk(t); if (!template_disk) return 0; - if (!blk_integrity_is_initialized(dm_disk(md))) { + if (!integrity_profile_exists(dm_disk(md))) { t->integrity_supported = 1; - return blk_integrity_register(dm_disk(md), NULL); + /* + * Register integrity profile during table load; we can do + * this because the final profile must match during resume. + */ + blk_integrity_register(dm_disk(md), + blk_get_integrity(template_disk)); + return 0; } /* - * If DM device already has an initalized integrity + * If DM device already has an initialized integrity * profile the new profile should not conflict. */ - if (blk_integrity_is_initialized(template_disk) && - blk_integrity_compare(dm_disk(md), template_disk) < 0) { + if (blk_integrity_compare(dm_disk(md), template_disk) < 0) { DMWARN("%s: conflict with existing integrity profile: " "%s profile mismatch", dm_device_name(t->md), @@ -1087,7 +1092,7 @@ static int dm_table_prealloc_integrity(struct dm_table *t, struct mapped_device return 1; } - /* Preserve existing initialized integrity profile */ + /* Preserve existing integrity profile */ t->integrity_supported = 1; return 0; } @@ -1112,7 +1117,7 @@ int dm_table_complete(struct dm_table *t) return r; } - r = dm_table_prealloc_integrity(t, t->md); + r = dm_table_register_integrity(t); if (r) { DMERR("could not register integrity profile."); return r; @@ -1278,29 +1283,30 @@ combine_limits: } /* - * Set the integrity profile for this device if all devices used have - * matching profiles. We're quite deep in the resume path but still - * don't know if all devices (particularly DM devices this device - * may be stacked on) have matching profiles. Even if the profiles - * don't match we have no way to fail (to resume) at this point. + * Verify that all devices have an integrity profile that matches the + * DM device's registered integrity profile. If the profiles don't + * match then unregister the DM device's integrity profile. */ -static void dm_table_set_integrity(struct dm_table *t) +static void dm_table_verify_integrity(struct dm_table *t) { struct gendisk *template_disk = NULL; - if (!blk_get_integrity(dm_disk(t->md))) - return; + if (t->integrity_supported) { + /* + * Verify that the original integrity profile + * matches all the devices in this table. + */ + template_disk = dm_table_get_integrity_disk(t); + if (template_disk && + blk_integrity_compare(dm_disk(t->md), template_disk) >= 0) + return; + } - template_disk = dm_table_get_integrity_disk(t, true); - if (template_disk) - blk_integrity_register(dm_disk(t->md), - blk_get_integrity(template_disk)); - else if (blk_integrity_is_initialized(dm_disk(t->md))) - DMWARN("%s: device no longer has a valid integrity profile", - dm_device_name(t->md)); - else + if (integrity_profile_exists(dm_disk(t->md))) { DMWARN("%s: unable to establish an integrity profile", dm_device_name(t->md)); + blk_integrity_unregister(dm_disk(t->md)); + } } static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev, @@ -1500,7 +1506,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, else queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); - dm_table_set_integrity(t); + dm_table_verify_integrity(t); /* * Determine whether or not this queue's I/O timings contribute |