diff options
| -rw-r--r-- | Documentation/admin-guide/md.rst | 32 | ||||
| -rw-r--r-- | drivers/md/md.c | 115 |
2 files changed, 144 insertions, 3 deletions
diff --git a/Documentation/admin-guide/md.rst b/Documentation/admin-guide/md.rst index 1e61bf50595c..84de718f24a4 100644 --- a/Documentation/admin-guide/md.rst +++ b/Documentation/admin-guide/md.rst @@ -276,14 +276,14 @@ All md devices contain: array creation it will default to 0, though starting the array as ``clean`` will set it much larger. - new_dev + new_dev This file can be written but not read. The value written should be a block device number as major:minor. e.g. 8:0 This will cause that device to be attached to the array, if it is available. It will then appear at md/dev-XXX (depending on the name of the device) and further configuration is then possible. - safe_mode_delay + safe_mode_delay When an md array has seen no write requests for a certain period of time, it will be marked as ``clean``. When another write request arrives, the array is marked as ``dirty`` before the write @@ -292,7 +292,7 @@ All md devices contain: period as a number of seconds. The default is 200msec (0.200). Writing a value of 0 disables safemode. - array_state + array_state This file contains a single word which describes the current state of the array. In many cases, the state can be set by writing the word for the desired state, however some states @@ -401,7 +401,30 @@ All md devices contain: once the array becomes non-degraded, and this fact has been recorded in the metadata. + consistency_policy + This indicates how the array maintains consistency in case of unexpected + shutdown. It can be: + none + Array has no redundancy information, e.g. raid0, linear. + + resync + Full resync is performed and all redundancy is regenerated when the + array is started after unclean shutdown. + + bitmap + Resync assisted by a write-intent bitmap. + + journal + For raid4/5/6, journal device is used to log transactions and replay + after unclean shutdown. + + ppl + For raid5 only, Partial Parity Log is used to close the write hole and + eliminate resync. + + The accepted values when writing to this file are ``ppl`` and ``resync``, + used to enable and disable PPL. As component devices are added to an md array, they appear in the ``md`` @@ -563,6 +586,9 @@ Each directory contains: adds bad blocks without acknowledging them. This is largely for testing. + ppl_sector, ppl_size + Location and size (in sectors) of the space used for Partial Parity Log + on this device. An active md device will also contain an entry for each active device diff --git a/drivers/md/md.c b/drivers/md/md.c index d57045996d35..a7740306cbbd 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3150,6 +3150,78 @@ static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) static struct rdev_sysfs_entry rdev_unack_bad_blocks = __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); +static ssize_t +ppl_sector_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector); +} + +static ssize_t +ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + unsigned long long sector; + + if (kstrtoull(buf, 10, §or) < 0) + return -EINVAL; + if (sector != (sector_t)sector) + return -EINVAL; + + if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && + rdev->raid_disk >= 0) + return -EBUSY; + + if (rdev->mddev->persistent) { + if (rdev->mddev->major_version == 0) + return -EINVAL; + if ((sector > rdev->sb_start && + sector - rdev->sb_start > S16_MAX) || + (sector < rdev->sb_start && + rdev->sb_start - sector > -S16_MIN)) + return -EINVAL; + rdev->ppl.offset = sector - rdev->sb_start; + } else if (!rdev->mddev->external) { + return -EBUSY; + } + rdev->ppl.sector = sector; + return len; +} + +static struct rdev_sysfs_entry rdev_ppl_sector = +__ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store); + +static ssize_t +ppl_size_show(struct md_rdev *rdev, char *page) +{ + return sprintf(page, "%u\n", rdev->ppl.size); +} + +static ssize_t +ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len) +{ + unsigned int size; + + if (kstrtouint(buf, 10, &size) < 0) + return -EINVAL; + + if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && + rdev->raid_disk >= 0) + return -EBUSY; + + if (rdev->mddev->persistent) { + if (rdev->mddev->major_version == 0) + return -EINVAL; + if (size > U16_MAX) + return -EINVAL; + } else if (!rdev->mddev->external) { + return -EBUSY; + } + rdev->ppl.size = size; + return len; +} + +static struct rdev_sysfs_entry rdev_ppl_size = +__ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store); + static struct attribute *rdev_default_attrs[] = { &rdev_state.attr, &rdev_errors.attr, @@ -3160,6 +3232,8 @@ static struct attribute *rdev_default_attrs[] = { &rdev_recovery_start.attr, &rdev_bad_blocks.attr, &rdev_unack_bad_blocks.attr, + &rdev_ppl_sector.attr, + &rdev_ppl_size.attr, NULL, }; static ssize_t @@ -4896,6 +4970,46 @@ static struct md_sysfs_entry md_array_size = __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, array_size_store); +static ssize_t +consistency_policy_show(struct mddev *mddev, char *page) +{ + int ret; + + if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { + ret = sprintf(page, "journal\n"); + } else if (test_bit(MD_HAS_PPL, &mddev->flags)) { + ret = sprintf(page, "ppl\n"); + } else if (mddev->bitmap) { + ret = sprintf(page, "bitmap\n"); + } else if (mddev->pers) { + if (mddev->pers->sync_request) + ret = sprintf(page, "resync\n"); + else + ret = sprintf(page, "none\n"); + } else { + ret = sprintf(page, "unknown\n"); + } + + return ret; +} + +static ssize_t +consistency_policy_store(struct mddev *mddev, const char *buf, size_t len) +{ + if (mddev->pers) { + return -EBUSY; + } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) { + set_bit(MD_HAS_PPL, &mddev->flags); + return len; + } else { + return -EINVAL; + } +} + +static struct md_sysfs_entry md_consistency_policy = +__ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show, + consistency_policy_store); + static struct attribute *md_default_attrs[] = { &md_level.attr, &md_layout.attr, @@ -4911,6 +5025,7 @@ static struct attribute *md_default_attrs[] = { &md_reshape_direction.attr, &md_array_size.attr, &max_corr_read_errors.attr, + &md_consistency_policy.attr, NULL, }; |