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- /*
- * Copyright (C) 2001 Sistina Software (UK) Limited.
- * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
- *
- * This file is released under the GPL.
- */
- #include "dm-core.h"
- #include "dm-rq.h"
- #include <linux/module.h>
- #include <linux/vmalloc.h>
- #include <linux/blkdev.h>
- #include <linux/blk-integrity.h>
- #include <linux/namei.h>
- #include <linux/ctype.h>
- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/interrupt.h>
- #include <linux/mutex.h>
- #include <linux/delay.h>
- #include <linux/atomic.h>
- #include <linux/blk-mq.h>
- #include <linux/mount.h>
- #include <linux/dax.h>
- #define DM_MSG_PREFIX "table"
- #define NODE_SIZE L1_CACHE_BYTES
- #define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t))
- #define CHILDREN_PER_NODE (KEYS_PER_NODE + 1)
- /*
- * Similar to ceiling(log_size(n))
- */
- static unsigned int int_log(unsigned int n, unsigned int base)
- {
- int result = 0;
- while (n > 1) {
- n = dm_div_up(n, base);
- result++;
- }
- return result;
- }
- /*
- * Calculate the index of the child node of the n'th node k'th key.
- */
- static inline unsigned int get_child(unsigned int n, unsigned int k)
- {
- return (n * CHILDREN_PER_NODE) + k;
- }
- /*
- * Return the n'th node of level l from table t.
- */
- static inline sector_t *get_node(struct dm_table *t,
- unsigned int l, unsigned int n)
- {
- return t->index[l] + (n * KEYS_PER_NODE);
- }
- /*
- * Return the highest key that you could lookup from the n'th
- * node on level l of the btree.
- */
- static sector_t high(struct dm_table *t, unsigned int l, unsigned int n)
- {
- for (; l < t->depth - 1; l++)
- n = get_child(n, CHILDREN_PER_NODE - 1);
- if (n >= t->counts[l])
- return (sector_t) - 1;
- return get_node(t, l, n)[KEYS_PER_NODE - 1];
- }
- /*
- * Fills in a level of the btree based on the highs of the level
- * below it.
- */
- static int setup_btree_index(unsigned int l, struct dm_table *t)
- {
- unsigned int n, k;
- sector_t *node;
- for (n = 0U; n < t->counts[l]; n++) {
- node = get_node(t, l, n);
- for (k = 0U; k < KEYS_PER_NODE; k++)
- node[k] = high(t, l + 1, get_child(n, k));
- }
- return 0;
- }
- /*
- * highs, and targets are managed as dynamic arrays during a
- * table load.
- */
- static int alloc_targets(struct dm_table *t, unsigned int num)
- {
- sector_t *n_highs;
- struct dm_target *n_targets;
- /*
- * Allocate both the target array and offset array at once.
- */
- n_highs = kvcalloc(num, sizeof(struct dm_target) + sizeof(sector_t),
- GFP_KERNEL);
- if (!n_highs)
- return -ENOMEM;
- n_targets = (struct dm_target *) (n_highs + num);
- memset(n_highs, -1, sizeof(*n_highs) * num);
- kvfree(t->highs);
- t->num_allocated = num;
- t->highs = n_highs;
- t->targets = n_targets;
- return 0;
- }
- int dm_table_create(struct dm_table **result, fmode_t mode,
- unsigned int num_targets, struct mapped_device *md)
- {
- struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL);
- if (!t)
- return -ENOMEM;
- INIT_LIST_HEAD(&t->devices);
- if (!num_targets)
- num_targets = KEYS_PER_NODE;
- num_targets = dm_round_up(num_targets, KEYS_PER_NODE);
- if (!num_targets) {
- kfree(t);
- return -ENOMEM;
- }
- if (alloc_targets(t, num_targets)) {
- kfree(t);
- return -ENOMEM;
- }
- t->type = DM_TYPE_NONE;
- t->mode = mode;
- t->md = md;
- *result = t;
- return 0;
- }
- static void free_devices(struct list_head *devices, struct mapped_device *md)
- {
- struct list_head *tmp, *next;
- list_for_each_safe(tmp, next, devices) {
- struct dm_dev_internal *dd =
- list_entry(tmp, struct dm_dev_internal, list);
- DMWARN("%s: dm_table_destroy: dm_put_device call missing for %s",
- dm_device_name(md), dd->dm_dev->name);
- dm_put_table_device(md, dd->dm_dev);
- kfree(dd);
- }
- }
- static void dm_table_destroy_crypto_profile(struct dm_table *t);
- void dm_table_destroy(struct dm_table *t)
- {
- if (!t)
- return;
- /* free the indexes */
- if (t->depth >= 2)
- kvfree(t->index[t->depth - 2]);
- /* free the targets */
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (ti->type->dtr)
- ti->type->dtr(ti);
- dm_put_target_type(ti->type);
- }
- kvfree(t->highs);
- /* free the device list */
- free_devices(&t->devices, t->md);
- dm_free_md_mempools(t->mempools);
- dm_table_destroy_crypto_profile(t);
- kfree(t);
- }
- /*
- * See if we've already got a device in the list.
- */
- static struct dm_dev_internal *find_device(struct list_head *l, dev_t dev)
- {
- struct dm_dev_internal *dd;
- list_for_each_entry(dd, l, list)
- if (dd->dm_dev->bdev->bd_dev == dev)
- return dd;
- return NULL;
- }
- /*
- * If possible, this checks an area of a destination device is invalid.
- */
- static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct queue_limits *limits = data;
- struct block_device *bdev = dev->bdev;
- sector_t dev_size = bdev_nr_sectors(bdev);
- unsigned short logical_block_size_sectors =
- limits->logical_block_size >> SECTOR_SHIFT;
- if (!dev_size)
- return 0;
- if ((start >= dev_size) || (start + len > dev_size)) {
- DMERR("%s: %pg too small for target: start=%llu, len=%llu, dev_size=%llu",
- dm_device_name(ti->table->md), bdev,
- (unsigned long long)start,
- (unsigned long long)len,
- (unsigned long long)dev_size);
- return 1;
- }
- /*
- * If the target is mapped to zoned block device(s), check
- * that the zones are not partially mapped.
- */
- if (bdev_is_zoned(bdev)) {
- unsigned int zone_sectors = bdev_zone_sectors(bdev);
- if (start & (zone_sectors - 1)) {
- DMERR("%s: start=%llu not aligned to h/w zone size %u of %pg",
- dm_device_name(ti->table->md),
- (unsigned long long)start,
- zone_sectors, bdev);
- return 1;
- }
- /*
- * Note: The last zone of a zoned block device may be smaller
- * than other zones. So for a target mapping the end of a
- * zoned block device with such a zone, len would not be zone
- * aligned. We do not allow such last smaller zone to be part
- * of the mapping here to ensure that mappings with multiple
- * devices do not end up with a smaller zone in the middle of
- * the sector range.
- */
- if (len & (zone_sectors - 1)) {
- DMERR("%s: len=%llu not aligned to h/w zone size %u of %pg",
- dm_device_name(ti->table->md),
- (unsigned long long)len,
- zone_sectors, bdev);
- return 1;
- }
- }
- if (logical_block_size_sectors <= 1)
- return 0;
- if (start & (logical_block_size_sectors - 1)) {
- DMERR("%s: start=%llu not aligned to h/w logical block size %u of %pg",
- dm_device_name(ti->table->md),
- (unsigned long long)start,
- limits->logical_block_size, bdev);
- return 1;
- }
- if (len & (logical_block_size_sectors - 1)) {
- DMERR("%s: len=%llu not aligned to h/w logical block size %u of %pg",
- dm_device_name(ti->table->md),
- (unsigned long long)len,
- limits->logical_block_size, bdev);
- return 1;
- }
- return 0;
- }
- /*
- * This upgrades the mode on an already open dm_dev, being
- * careful to leave things as they were if we fail to reopen the
- * device and not to touch the existing bdev field in case
- * it is accessed concurrently.
- */
- static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode,
- struct mapped_device *md)
- {
- int r;
- struct dm_dev *old_dev, *new_dev;
- old_dev = dd->dm_dev;
- r = dm_get_table_device(md, dd->dm_dev->bdev->bd_dev,
- dd->dm_dev->mode | new_mode, &new_dev);
- if (r)
- return r;
- dd->dm_dev = new_dev;
- dm_put_table_device(md, old_dev);
- return 0;
- }
- /*
- * Convert the path to a device
- */
- dev_t dm_get_dev_t(const char *path)
- {
- dev_t dev;
- if (lookup_bdev(path, &dev))
- dev = name_to_dev_t(path);
- return dev;
- }
- EXPORT_SYMBOL_GPL(dm_get_dev_t);
- /*
- * Add a device to the list, or just increment the usage count if
- * it's already present.
- */
- int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
- struct dm_dev **result)
- {
- int r;
- dev_t dev;
- unsigned int major, minor;
- char dummy;
- struct dm_dev_internal *dd;
- struct dm_table *t = ti->table;
- BUG_ON(!t);
- if (sscanf(path, "%u:%u%c", &major, &minor, &dummy) == 2) {
- /* Extract the major/minor numbers */
- dev = MKDEV(major, minor);
- if (MAJOR(dev) != major || MINOR(dev) != minor)
- return -EOVERFLOW;
- } else {
- dev = dm_get_dev_t(path);
- if (!dev)
- return -ENODEV;
- }
- dd = find_device(&t->devices, dev);
- if (!dd) {
- dd = kmalloc(sizeof(*dd), GFP_KERNEL);
- if (!dd)
- return -ENOMEM;
- if ((r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev))) {
- kfree(dd);
- return r;
- }
- refcount_set(&dd->count, 1);
- list_add(&dd->list, &t->devices);
- goto out;
- } else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) {
- r = upgrade_mode(dd, mode, t->md);
- if (r)
- return r;
- }
- refcount_inc(&dd->count);
- out:
- *result = dd->dm_dev;
- return 0;
- }
- EXPORT_SYMBOL(dm_get_device);
- static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct queue_limits *limits = data;
- struct block_device *bdev = dev->bdev;
- struct request_queue *q = bdev_get_queue(bdev);
- if (unlikely(!q)) {
- DMWARN("%s: Cannot set limits for nonexistent device %pg",
- dm_device_name(ti->table->md), bdev);
- return 0;
- }
- if (blk_stack_limits(limits, &q->limits,
- get_start_sect(bdev) + start) < 0)
- DMWARN("%s: adding target device %pg caused an alignment inconsistency: "
- "physical_block_size=%u, logical_block_size=%u, "
- "alignment_offset=%u, start=%llu",
- dm_device_name(ti->table->md), bdev,
- q->limits.physical_block_size,
- q->limits.logical_block_size,
- q->limits.alignment_offset,
- (unsigned long long) start << SECTOR_SHIFT);
- return 0;
- }
- /*
- * Decrement a device's use count and remove it if necessary.
- */
- void dm_put_device(struct dm_target *ti, struct dm_dev *d)
- {
- int found = 0;
- struct list_head *devices = &ti->table->devices;
- struct dm_dev_internal *dd;
- list_for_each_entry(dd, devices, list) {
- if (dd->dm_dev == d) {
- found = 1;
- break;
- }
- }
- if (!found) {
- DMERR("%s: device %s not in table devices list",
- dm_device_name(ti->table->md), d->name);
- return;
- }
- if (refcount_dec_and_test(&dd->count)) {
- dm_put_table_device(ti->table->md, d);
- list_del(&dd->list);
- kfree(dd);
- }
- }
- EXPORT_SYMBOL(dm_put_device);
- /*
- * Checks to see if the target joins onto the end of the table.
- */
- static int adjoin(struct dm_table *t, struct dm_target *ti)
- {
- struct dm_target *prev;
- if (!t->num_targets)
- return !ti->begin;
- prev = &t->targets[t->num_targets - 1];
- return (ti->begin == (prev->begin + prev->len));
- }
- /*
- * Used to dynamically allocate the arg array.
- *
- * We do first allocation with GFP_NOIO because dm-mpath and dm-thin must
- * process messages even if some device is suspended. These messages have a
- * small fixed number of arguments.
- *
- * On the other hand, dm-switch needs to process bulk data using messages and
- * excessive use of GFP_NOIO could cause trouble.
- */
- static char **realloc_argv(unsigned int *size, char **old_argv)
- {
- char **argv;
- unsigned int new_size;
- gfp_t gfp;
- if (*size) {
- new_size = *size * 2;
- gfp = GFP_KERNEL;
- } else {
- new_size = 8;
- gfp = GFP_NOIO;
- }
- argv = kmalloc_array(new_size, sizeof(*argv), gfp);
- if (argv && old_argv) {
- memcpy(argv, old_argv, *size * sizeof(*argv));
- *size = new_size;
- }
- kfree(old_argv);
- return argv;
- }
- /*
- * Destructively splits up the argument list to pass to ctr.
- */
- int dm_split_args(int *argc, char ***argvp, char *input)
- {
- char *start, *end = input, *out, **argv = NULL;
- unsigned int array_size = 0;
- *argc = 0;
- if (!input) {
- *argvp = NULL;
- return 0;
- }
- argv = realloc_argv(&array_size, argv);
- if (!argv)
- return -ENOMEM;
- while (1) {
- /* Skip whitespace */
- start = skip_spaces(end);
- if (!*start)
- break; /* success, we hit the end */
- /* 'out' is used to remove any back-quotes */
- end = out = start;
- while (*end) {
- /* Everything apart from '\0' can be quoted */
- if (*end == '\\' && *(end + 1)) {
- *out++ = *(end + 1);
- end += 2;
- continue;
- }
- if (isspace(*end))
- break; /* end of token */
- *out++ = *end++;
- }
- /* have we already filled the array ? */
- if ((*argc + 1) > array_size) {
- argv = realloc_argv(&array_size, argv);
- if (!argv)
- return -ENOMEM;
- }
- /* we know this is whitespace */
- if (*end)
- end++;
- /* terminate the string and put it in the array */
- *out = '\0';
- argv[*argc] = start;
- (*argc)++;
- }
- *argvp = argv;
- return 0;
- }
- /*
- * Impose necessary and sufficient conditions on a devices's table such
- * that any incoming bio which respects its logical_block_size can be
- * processed successfully. If it falls across the boundary between
- * two or more targets, the size of each piece it gets split into must
- * be compatible with the logical_block_size of the target processing it.
- */
- static int validate_hardware_logical_block_alignment(struct dm_table *t,
- struct queue_limits *limits)
- {
- /*
- * This function uses arithmetic modulo the logical_block_size
- * (in units of 512-byte sectors).
- */
- unsigned short device_logical_block_size_sects =
- limits->logical_block_size >> SECTOR_SHIFT;
- /*
- * Offset of the start of the next table entry, mod logical_block_size.
- */
- unsigned short next_target_start = 0;
- /*
- * Given an aligned bio that extends beyond the end of a
- * target, how many sectors must the next target handle?
- */
- unsigned short remaining = 0;
- struct dm_target *ti;
- struct queue_limits ti_limits;
- unsigned int i;
- /*
- * Check each entry in the table in turn.
- */
- for (i = 0; i < t->num_targets; i++) {
- ti = dm_table_get_target(t, i);
- blk_set_stacking_limits(&ti_limits);
- /* combine all target devices' limits */
- if (ti->type->iterate_devices)
- ti->type->iterate_devices(ti, dm_set_device_limits,
- &ti_limits);
- /*
- * If the remaining sectors fall entirely within this
- * table entry are they compatible with its logical_block_size?
- */
- if (remaining < ti->len &&
- remaining & ((ti_limits.logical_block_size >>
- SECTOR_SHIFT) - 1))
- break; /* Error */
- next_target_start =
- (unsigned short) ((next_target_start + ti->len) &
- (device_logical_block_size_sects - 1));
- remaining = next_target_start ?
- device_logical_block_size_sects - next_target_start : 0;
- }
- if (remaining) {
- DMERR("%s: table line %u (start sect %llu len %llu) "
- "not aligned to h/w logical block size %u",
- dm_device_name(t->md), i,
- (unsigned long long) ti->begin,
- (unsigned long long) ti->len,
- limits->logical_block_size);
- return -EINVAL;
- }
- return 0;
- }
- int dm_table_add_target(struct dm_table *t, const char *type,
- sector_t start, sector_t len, char *params)
- {
- int r = -EINVAL, argc;
- char **argv;
- struct dm_target *ti;
- if (t->singleton) {
- DMERR("%s: target type %s must appear alone in table",
- dm_device_name(t->md), t->targets->type->name);
- return -EINVAL;
- }
- BUG_ON(t->num_targets >= t->num_allocated);
- ti = t->targets + t->num_targets;
- memset(ti, 0, sizeof(*ti));
- if (!len) {
- DMERR("%s: zero-length target", dm_device_name(t->md));
- return -EINVAL;
- }
- ti->type = dm_get_target_type(type);
- if (!ti->type) {
- DMERR("%s: %s: unknown target type", dm_device_name(t->md), type);
- return -EINVAL;
- }
- if (dm_target_needs_singleton(ti->type)) {
- if (t->num_targets) {
- ti->error = "singleton target type must appear alone in table";
- goto bad;
- }
- t->singleton = true;
- }
- if (dm_target_always_writeable(ti->type) && !(t->mode & FMODE_WRITE)) {
- ti->error = "target type may not be included in a read-only table";
- goto bad;
- }
- if (t->immutable_target_type) {
- if (t->immutable_target_type != ti->type) {
- ti->error = "immutable target type cannot be mixed with other target types";
- goto bad;
- }
- } else if (dm_target_is_immutable(ti->type)) {
- if (t->num_targets) {
- ti->error = "immutable target type cannot be mixed with other target types";
- goto bad;
- }
- t->immutable_target_type = ti->type;
- }
- if (dm_target_has_integrity(ti->type))
- t->integrity_added = 1;
- ti->table = t;
- ti->begin = start;
- ti->len = len;
- ti->error = "Unknown error";
- /*
- * Does this target adjoin the previous one ?
- */
- if (!adjoin(t, ti)) {
- ti->error = "Gap in table";
- goto bad;
- }
- r = dm_split_args(&argc, &argv, params);
- if (r) {
- ti->error = "couldn't split parameters";
- goto bad;
- }
- r = ti->type->ctr(ti, argc, argv);
- kfree(argv);
- if (r)
- goto bad;
- t->highs[t->num_targets++] = ti->begin + ti->len - 1;
- if (!ti->num_discard_bios && ti->discards_supported)
- DMWARN("%s: %s: ignoring discards_supported because num_discard_bios is zero.",
- dm_device_name(t->md), type);
- if (ti->limit_swap_bios && !static_key_enabled(&swap_bios_enabled.key))
- static_branch_enable(&swap_bios_enabled);
- return 0;
- bad:
- DMERR("%s: %s: %s (%pe)", dm_device_name(t->md), type, ti->error, ERR_PTR(r));
- dm_put_target_type(ti->type);
- return r;
- }
- /*
- * Target argument parsing helpers.
- */
- static int validate_next_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
- unsigned int *value, char **error, unsigned int grouped)
- {
- const char *arg_str = dm_shift_arg(arg_set);
- char dummy;
- if (!arg_str ||
- (sscanf(arg_str, "%u%c", value, &dummy) != 1) ||
- (*value < arg->min) ||
- (*value > arg->max) ||
- (grouped && arg_set->argc < *value)) {
- *error = arg->error;
- return -EINVAL;
- }
- return 0;
- }
- int dm_read_arg(const struct dm_arg *arg, struct dm_arg_set *arg_set,
- unsigned int *value, char **error)
- {
- return validate_next_arg(arg, arg_set, value, error, 0);
- }
- EXPORT_SYMBOL(dm_read_arg);
- int dm_read_arg_group(const struct dm_arg *arg, struct dm_arg_set *arg_set,
- unsigned int *value, char **error)
- {
- return validate_next_arg(arg, arg_set, value, error, 1);
- }
- EXPORT_SYMBOL(dm_read_arg_group);
- const char *dm_shift_arg(struct dm_arg_set *as)
- {
- char *r;
- if (as->argc) {
- as->argc--;
- r = *as->argv;
- as->argv++;
- return r;
- }
- return NULL;
- }
- EXPORT_SYMBOL(dm_shift_arg);
- void dm_consume_args(struct dm_arg_set *as, unsigned int num_args)
- {
- BUG_ON(as->argc < num_args);
- as->argc -= num_args;
- as->argv += num_args;
- }
- EXPORT_SYMBOL(dm_consume_args);
- static bool __table_type_bio_based(enum dm_queue_mode table_type)
- {
- return (table_type == DM_TYPE_BIO_BASED ||
- table_type == DM_TYPE_DAX_BIO_BASED);
- }
- static bool __table_type_request_based(enum dm_queue_mode table_type)
- {
- return table_type == DM_TYPE_REQUEST_BASED;
- }
- void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type)
- {
- t->type = type;
- }
- EXPORT_SYMBOL_GPL(dm_table_set_type);
- /* validate the dax capability of the target device span */
- static int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- if (dev->dax_dev)
- return false;
- DMDEBUG("%pg: error: dax unsupported by block device", dev->bdev);
- return true;
- }
- /* Check devices support synchronous DAX */
- static int device_not_dax_synchronous_capable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- return !dev->dax_dev || !dax_synchronous(dev->dax_dev);
- }
- static bool dm_table_supports_dax(struct dm_table *t,
- iterate_devices_callout_fn iterate_fn)
- {
- /* Ensure that all targets support DAX. */
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->type->direct_access)
- return false;
- if (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, iterate_fn, NULL))
- return false;
- }
- return true;
- }
- static int device_is_rq_stackable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct block_device *bdev = dev->bdev;
- struct request_queue *q = bdev_get_queue(bdev);
- /* request-based cannot stack on partitions! */
- if (bdev_is_partition(bdev))
- return false;
- return queue_is_mq(q);
- }
- static int dm_table_determine_type(struct dm_table *t)
- {
- unsigned int bio_based = 0, request_based = 0, hybrid = 0;
- struct dm_target *ti;
- struct list_head *devices = dm_table_get_devices(t);
- enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
- if (t->type != DM_TYPE_NONE) {
- /* target already set the table's type */
- if (t->type == DM_TYPE_BIO_BASED) {
- /* possibly upgrade to a variant of bio-based */
- goto verify_bio_based;
- }
- BUG_ON(t->type == DM_TYPE_DAX_BIO_BASED);
- goto verify_rq_based;
- }
- for (unsigned int i = 0; i < t->num_targets; i++) {
- ti = dm_table_get_target(t, i);
- if (dm_target_hybrid(ti))
- hybrid = 1;
- else if (dm_target_request_based(ti))
- request_based = 1;
- else
- bio_based = 1;
- if (bio_based && request_based) {
- DMERR("Inconsistent table: different target types can't be mixed up");
- return -EINVAL;
- }
- }
- if (hybrid && !bio_based && !request_based) {
- /*
- * The targets can work either way.
- * Determine the type from the live device.
- * Default to bio-based if device is new.
- */
- if (__table_type_request_based(live_md_type))
- request_based = 1;
- else
- bio_based = 1;
- }
- if (bio_based) {
- verify_bio_based:
- /* We must use this table as bio-based */
- t->type = DM_TYPE_BIO_BASED;
- if (dm_table_supports_dax(t, device_not_dax_capable) ||
- (list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) {
- t->type = DM_TYPE_DAX_BIO_BASED;
- }
- return 0;
- }
- BUG_ON(!request_based); /* No targets in this table */
- t->type = DM_TYPE_REQUEST_BASED;
- verify_rq_based:
- /*
- * Request-based dm supports only tables that have a single target now.
- * To support multiple targets, request splitting support is needed,
- * and that needs lots of changes in the block-layer.
- * (e.g. request completion process for partial completion.)
- */
- if (t->num_targets > 1) {
- DMERR("request-based DM doesn't support multiple targets");
- return -EINVAL;
- }
- if (list_empty(devices)) {
- int srcu_idx;
- struct dm_table *live_table = dm_get_live_table(t->md, &srcu_idx);
- /* inherit live table's type */
- if (live_table)
- t->type = live_table->type;
- dm_put_live_table(t->md, srcu_idx);
- return 0;
- }
- ti = dm_table_get_immutable_target(t);
- if (!ti) {
- DMERR("table load rejected: immutable target is required");
- return -EINVAL;
- } else if (ti->max_io_len) {
- DMERR("table load rejected: immutable target that splits IO is not supported");
- return -EINVAL;
- }
- /* Non-request-stackable devices can't be used for request-based dm */
- if (!ti->type->iterate_devices ||
- !ti->type->iterate_devices(ti, device_is_rq_stackable, NULL)) {
- DMERR("table load rejected: including non-request-stackable devices");
- return -EINVAL;
- }
- return 0;
- }
- enum dm_queue_mode dm_table_get_type(struct dm_table *t)
- {
- return t->type;
- }
- struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
- {
- return t->immutable_target_type;
- }
- struct dm_target *dm_table_get_immutable_target(struct dm_table *t)
- {
- /* Immutable target is implicitly a singleton */
- if (t->num_targets > 1 ||
- !dm_target_is_immutable(t->targets[0].type))
- return NULL;
- return t->targets;
- }
- struct dm_target *dm_table_get_wildcard_target(struct dm_table *t)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (dm_target_is_wildcard(ti->type))
- return ti;
- }
- return NULL;
- }
- bool dm_table_bio_based(struct dm_table *t)
- {
- return __table_type_bio_based(dm_table_get_type(t));
- }
- bool dm_table_request_based(struct dm_table *t)
- {
- return __table_type_request_based(dm_table_get_type(t));
- }
- static bool dm_table_supports_poll(struct dm_table *t);
- static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
- {
- enum dm_queue_mode type = dm_table_get_type(t);
- unsigned int per_io_data_size = 0, front_pad, io_front_pad;
- unsigned int min_pool_size = 0, pool_size;
- struct dm_md_mempools *pools;
- if (unlikely(type == DM_TYPE_NONE)) {
- DMERR("no table type is set, can't allocate mempools");
- return -EINVAL;
- }
- pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id);
- if (!pools)
- return -ENOMEM;
- if (type == DM_TYPE_REQUEST_BASED) {
- pool_size = dm_get_reserved_rq_based_ios();
- front_pad = offsetof(struct dm_rq_clone_bio_info, clone);
- goto init_bs;
- }
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- per_io_data_size = max(per_io_data_size, ti->per_io_data_size);
- min_pool_size = max(min_pool_size, ti->num_flush_bios);
- }
- pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
- front_pad = roundup(per_io_data_size,
- __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET;
- io_front_pad = roundup(per_io_data_size,
- __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET;
- if (bioset_init(&pools->io_bs, pool_size, io_front_pad,
- dm_table_supports_poll(t) ? BIOSET_PERCPU_CACHE : 0))
- goto out_free_pools;
- if (t->integrity_supported &&
- bioset_integrity_create(&pools->io_bs, pool_size))
- goto out_free_pools;
- init_bs:
- if (bioset_init(&pools->bs, pool_size, front_pad, 0))
- goto out_free_pools;
- if (t->integrity_supported &&
- bioset_integrity_create(&pools->bs, pool_size))
- goto out_free_pools;
- t->mempools = pools;
- return 0;
- out_free_pools:
- dm_free_md_mempools(pools);
- return -ENOMEM;
- }
- static int setup_indexes(struct dm_table *t)
- {
- int i;
- unsigned int total = 0;
- sector_t *indexes;
- /* allocate the space for *all* the indexes */
- for (i = t->depth - 2; i >= 0; i--) {
- t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE);
- total += t->counts[i];
- }
- indexes = kvcalloc(total, NODE_SIZE, GFP_KERNEL);
- if (!indexes)
- return -ENOMEM;
- /* set up internal nodes, bottom-up */
- for (i = t->depth - 2; i >= 0; i--) {
- t->index[i] = indexes;
- indexes += (KEYS_PER_NODE * t->counts[i]);
- setup_btree_index(i, t);
- }
- return 0;
- }
- /*
- * Builds the btree to index the map.
- */
- static int dm_table_build_index(struct dm_table *t)
- {
- int r = 0;
- unsigned int leaf_nodes;
- /* how many indexes will the btree have ? */
- leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE);
- t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE);
- /* leaf layer has already been set up */
- t->counts[t->depth - 1] = leaf_nodes;
- t->index[t->depth - 1] = t->highs;
- if (t->depth >= 2)
- r = setup_indexes(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.
- * Returns NULL if integrity support was inconsistent or unavailable.
- */
- 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;
- struct gendisk *prev_disk = NULL, *template_disk = NULL;
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!dm_target_passes_integrity(ti->type))
- goto no_integrity;
- }
- list_for_each_entry(dd, devices, list) {
- template_disk = dd->dm_dev->bdev->bd_disk;
- if (!integrity_profile_exists(template_disk))
- goto no_integrity;
- else if (prev_disk &&
- blk_integrity_compare(prev_disk, template_disk) < 0)
- goto no_integrity;
- prev_disk = template_disk;
- }
- return template_disk;
- no_integrity:
- if (prev_disk)
- DMWARN("%s: integrity not set: %s and %s profile mismatch",
- dm_device_name(t->md),
- prev_disk->disk_name,
- template_disk->disk_name);
- return NULL;
- }
- /*
- * 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). Consequently, stacked DM devices force a 2 stage integrity
- * profile validation: First pass during table load, final pass during
- * resume.
- */
- static int dm_table_register_integrity(struct dm_table *t)
- {
- struct mapped_device *md = t->md;
- struct gendisk *template_disk = NULL;
- /* If target handles integrity itself do not register it here. */
- if (t->integrity_added)
- return 0;
- template_disk = dm_table_get_integrity_disk(t);
- if (!template_disk)
- return 0;
- if (!integrity_profile_exists(dm_disk(md))) {
- t->integrity_supported = true;
- /*
- * 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 initialized integrity
- * profile the new profile should not conflict.
- */
- if (blk_integrity_compare(dm_disk(md), template_disk) < 0) {
- DMERR("%s: conflict with existing integrity profile: %s profile mismatch",
- dm_device_name(t->md),
- template_disk->disk_name);
- return 1;
- }
- /* Preserve existing integrity profile */
- t->integrity_supported = true;
- return 0;
- }
- #ifdef CONFIG_BLK_INLINE_ENCRYPTION
- struct dm_crypto_profile {
- struct blk_crypto_profile profile;
- struct mapped_device *md;
- };
- static int dm_keyslot_evict_callback(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- const struct blk_crypto_key *key = data;
- blk_crypto_evict_key(dev->bdev, key);
- return 0;
- }
- /*
- * When an inline encryption key is evicted from a device-mapper device, evict
- * it from all the underlying devices.
- */
- static int dm_keyslot_evict(struct blk_crypto_profile *profile,
- const struct blk_crypto_key *key, unsigned int slot)
- {
- struct mapped_device *md =
- container_of(profile, struct dm_crypto_profile, profile)->md;
- struct dm_table *t;
- int srcu_idx;
- t = dm_get_live_table(md, &srcu_idx);
- if (!t)
- return 0;
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->type->iterate_devices)
- continue;
- ti->type->iterate_devices(ti, dm_keyslot_evict_callback,
- (void *)key);
- }
- dm_put_live_table(md, srcu_idx);
- return 0;
- }
- struct dm_derive_sw_secret_args {
- const u8 *eph_key;
- size_t eph_key_size;
- u8 *sw_secret;
- int err;
- };
- static int dm_derive_sw_secret_callback(struct dm_target *ti,
- struct dm_dev *dev, sector_t start,
- sector_t len, void *data)
- {
- struct dm_derive_sw_secret_args *args = data;
- if (!args->err)
- return 0;
- args->err = blk_crypto_derive_sw_secret(dev->bdev,
- args->eph_key,
- args->eph_key_size,
- args->sw_secret);
- /* Try another device in case this fails. */
- return 0;
- }
- /*
- * Retrieve the sw_secret from the underlying device. Given that only one
- * sw_secret can exist for a particular wrapped key, retrieve it only from the
- * first device that supports derive_sw_secret().
- */
- static int dm_derive_sw_secret(struct blk_crypto_profile *profile,
- const u8 *eph_key, size_t eph_key_size,
- u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE])
- {
- struct mapped_device *md =
- container_of(profile, struct dm_crypto_profile, profile)->md;
- struct dm_derive_sw_secret_args args = {
- .eph_key = eph_key,
- .eph_key_size = eph_key_size,
- .sw_secret = sw_secret,
- .err = -EOPNOTSUPP,
- };
- struct dm_table *t;
- int srcu_idx;
- int i;
- struct dm_target *ti;
- t = dm_get_live_table(md, &srcu_idx);
- if (!t)
- return -EOPNOTSUPP;
- for (i = 0; i < t->num_targets; i++) {
- ti = dm_table_get_target(t, i);
- if (!ti->type->iterate_devices)
- continue;
- ti->type->iterate_devices(ti, dm_derive_sw_secret_callback,
- &args);
- if (!args.err)
- break;
- }
- dm_put_live_table(md, srcu_idx);
- return args.err;
- }
- static int
- device_intersect_crypto_capabilities(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct blk_crypto_profile *parent = data;
- struct blk_crypto_profile *child =
- bdev_get_queue(dev->bdev)->crypto_profile;
- blk_crypto_intersect_capabilities(parent, child);
- return 0;
- }
- void dm_destroy_crypto_profile(struct blk_crypto_profile *profile)
- {
- struct dm_crypto_profile *dmcp = container_of(profile,
- struct dm_crypto_profile,
- profile);
- if (!profile)
- return;
- blk_crypto_profile_destroy(profile);
- kfree(dmcp);
- }
- static void dm_table_destroy_crypto_profile(struct dm_table *t)
- {
- dm_destroy_crypto_profile(t->crypto_profile);
- t->crypto_profile = NULL;
- }
- /*
- * Constructs and initializes t->crypto_profile with a crypto profile that
- * represents the common set of crypto capabilities of the devices described by
- * the dm_table. However, if the constructed crypto profile doesn't support all
- * crypto capabilities that are supported by the current mapped_device, it
- * returns an error instead, since we don't support removing crypto capabilities
- * on table changes. Finally, if the constructed crypto profile is "empty" (has
- * no crypto capabilities at all), it just sets t->crypto_profile to NULL.
- */
- static int dm_table_construct_crypto_profile(struct dm_table *t)
- {
- struct dm_crypto_profile *dmcp;
- struct blk_crypto_profile *profile;
- unsigned int i;
- bool empty_profile = true;
- dmcp = kmalloc(sizeof(*dmcp), GFP_KERNEL);
- if (!dmcp)
- return -ENOMEM;
- dmcp->md = t->md;
- profile = &dmcp->profile;
- blk_crypto_profile_init(profile, 0);
- profile->ll_ops.keyslot_evict = dm_keyslot_evict;
- profile->ll_ops.derive_sw_secret = dm_derive_sw_secret;
- profile->max_dun_bytes_supported = UINT_MAX;
- memset(profile->modes_supported, 0xFF,
- sizeof(profile->modes_supported));
- profile->key_types_supported = ~0;
- for (i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!dm_target_passes_crypto(ti->type)) {
- blk_crypto_intersect_capabilities(profile, NULL);
- break;
- }
- if (!ti->type->iterate_devices)
- continue;
- ti->type->iterate_devices(ti,
- device_intersect_crypto_capabilities,
- profile);
- }
- if (t->md->queue &&
- !blk_crypto_has_capabilities(profile,
- t->md->queue->crypto_profile)) {
- DMERR("Inline encryption capabilities of new DM table were more restrictive than the old table's. This is not supported!");
- dm_destroy_crypto_profile(profile);
- return -EINVAL;
- }
- /*
- * If the new profile doesn't actually support any crypto capabilities,
- * we may as well represent it with a NULL profile.
- */
- for (i = 0; i < ARRAY_SIZE(profile->modes_supported); i++) {
- if (profile->modes_supported[i]) {
- empty_profile = false;
- break;
- }
- }
- if (empty_profile) {
- dm_destroy_crypto_profile(profile);
- profile = NULL;
- }
- /*
- * t->crypto_profile is only set temporarily while the table is being
- * set up, and it gets set to NULL after the profile has been
- * transferred to the request_queue.
- */
- t->crypto_profile = profile;
- return 0;
- }
- static void dm_update_crypto_profile(struct request_queue *q,
- struct dm_table *t)
- {
- if (!t->crypto_profile)
- return;
- /* Make the crypto profile less restrictive. */
- if (!q->crypto_profile) {
- blk_crypto_register(t->crypto_profile, q);
- } else {
- blk_crypto_update_capabilities(q->crypto_profile,
- t->crypto_profile);
- dm_destroy_crypto_profile(t->crypto_profile);
- }
- t->crypto_profile = NULL;
- }
- #else /* CONFIG_BLK_INLINE_ENCRYPTION */
- static int dm_table_construct_crypto_profile(struct dm_table *t)
- {
- return 0;
- }
- void dm_destroy_crypto_profile(struct blk_crypto_profile *profile)
- {
- }
- static void dm_table_destroy_crypto_profile(struct dm_table *t)
- {
- }
- static void dm_update_crypto_profile(struct request_queue *q,
- struct dm_table *t)
- {
- }
- #endif /* !CONFIG_BLK_INLINE_ENCRYPTION */
- /*
- * Prepares the table for use by building the indices,
- * setting the type, and allocating mempools.
- */
- int dm_table_complete(struct dm_table *t)
- {
- int r;
- r = dm_table_determine_type(t);
- if (r) {
- DMERR("unable to determine table type");
- return r;
- }
- r = dm_table_build_index(t);
- if (r) {
- DMERR("unable to build btrees");
- return r;
- }
- r = dm_table_register_integrity(t);
- if (r) {
- DMERR("could not register integrity profile.");
- return r;
- }
- r = dm_table_construct_crypto_profile(t);
- if (r) {
- DMERR("could not construct crypto profile.");
- return r;
- }
- r = dm_table_alloc_md_mempools(t, t->md);
- if (r)
- DMERR("unable to allocate mempools");
- return r;
- }
- static DEFINE_MUTEX(_event_lock);
- void dm_table_event_callback(struct dm_table *t,
- void (*fn)(void *), void *context)
- {
- mutex_lock(&_event_lock);
- t->event_fn = fn;
- t->event_context = context;
- mutex_unlock(&_event_lock);
- }
- void dm_table_event(struct dm_table *t)
- {
- mutex_lock(&_event_lock);
- if (t->event_fn)
- t->event_fn(t->event_context);
- mutex_unlock(&_event_lock);
- }
- EXPORT_SYMBOL(dm_table_event);
- inline sector_t dm_table_get_size(struct dm_table *t)
- {
- return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0;
- }
- EXPORT_SYMBOL(dm_table_get_size);
- /*
- * Search the btree for the correct target.
- *
- * Caller should check returned pointer for NULL
- * to trap I/O beyond end of device.
- */
- struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector)
- {
- unsigned int l, n = 0, k = 0;
- sector_t *node;
- if (unlikely(sector >= dm_table_get_size(t)))
- return NULL;
- for (l = 0; l < t->depth; l++) {
- n = get_child(n, k);
- node = get_node(t, l, n);
- for (k = 0; k < KEYS_PER_NODE; k++)
- if (node[k] >= sector)
- break;
- }
- return &t->targets[(KEYS_PER_NODE * n) + k];
- }
- static int device_not_poll_capable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct request_queue *q = bdev_get_queue(dev->bdev);
- return !test_bit(QUEUE_FLAG_POLL, &q->queue_flags);
- }
- /*
- * type->iterate_devices() should be called when the sanity check needs to
- * iterate and check all underlying data devices. iterate_devices() will
- * iterate all underlying data devices until it encounters a non-zero return
- * code, returned by whether the input iterate_devices_callout_fn, or
- * iterate_devices() itself internally.
- *
- * For some target type (e.g. dm-stripe), one call of iterate_devices() may
- * iterate multiple underlying devices internally, in which case a non-zero
- * return code returned by iterate_devices_callout_fn will stop the iteration
- * in advance.
- *
- * Cases requiring _any_ underlying device supporting some kind of attribute,
- * should use the iteration structure like dm_table_any_dev_attr(), or call
- * it directly. @func should handle semantics of positive examples, e.g.
- * capable of something.
- *
- * Cases requiring _all_ underlying devices supporting some kind of attribute,
- * should use the iteration structure like dm_table_supports_nowait() or
- * dm_table_supports_discards(). Or introduce dm_table_all_devs_attr() that
- * uses an @anti_func that handle semantics of counter examples, e.g. not
- * capable of something. So: return !dm_table_any_dev_attr(t, anti_func, data);
- */
- static bool dm_table_any_dev_attr(struct dm_table *t,
- iterate_devices_callout_fn func, void *data)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (ti->type->iterate_devices &&
- ti->type->iterate_devices(ti, func, data))
- return true;
- }
- return false;
- }
- static int count_device(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- unsigned int *num_devices = data;
- (*num_devices)++;
- return 0;
- }
- static bool dm_table_supports_poll(struct dm_table *t)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, device_not_poll_capable, NULL))
- return false;
- }
- return true;
- }
- /*
- * Check whether a table has no data devices attached using each
- * target's iterate_devices method.
- * Returns false if the result is unknown because a target doesn't
- * support iterate_devices.
- */
- bool dm_table_has_no_data_devices(struct dm_table *t)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- unsigned int num_devices = 0;
- if (!ti->type->iterate_devices)
- return false;
- ti->type->iterate_devices(ti, count_device, &num_devices);
- if (num_devices)
- return false;
- }
- return true;
- }
- static int device_not_zoned_model(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct request_queue *q = bdev_get_queue(dev->bdev);
- enum blk_zoned_model *zoned_model = data;
- return blk_queue_zoned_model(q) != *zoned_model;
- }
- /*
- * Check the device zoned model based on the target feature flag. If the target
- * has the DM_TARGET_ZONED_HM feature flag set, host-managed zoned devices are
- * also accepted but all devices must have the same zoned model. If the target
- * has the DM_TARGET_MIXED_ZONED_MODEL feature set, the devices can have any
- * zoned model with all zoned devices having the same zone size.
- */
- static bool dm_table_supports_zoned_model(struct dm_table *t,
- enum blk_zoned_model zoned_model)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (dm_target_supports_zoned_hm(ti->type)) {
- if (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, device_not_zoned_model,
- &zoned_model))
- return false;
- } else if (!dm_target_supports_mixed_zoned_model(ti->type)) {
- if (zoned_model == BLK_ZONED_HM)
- return false;
- }
- }
- return true;
- }
- static int device_not_matches_zone_sectors(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- unsigned int *zone_sectors = data;
- if (!bdev_is_zoned(dev->bdev))
- return 0;
- return bdev_zone_sectors(dev->bdev) != *zone_sectors;
- }
- /*
- * Check consistency of zoned model and zone sectors across all targets. For
- * zone sectors, if the destination device is a zoned block device, it shall
- * have the specified zone_sectors.
- */
- static int validate_hardware_zoned_model(struct dm_table *t,
- enum blk_zoned_model zoned_model,
- unsigned int zone_sectors)
- {
- if (zoned_model == BLK_ZONED_NONE)
- return 0;
- if (!dm_table_supports_zoned_model(t, zoned_model)) {
- DMERR("%s: zoned model is not consistent across all devices",
- dm_device_name(t->md));
- return -EINVAL;
- }
- /* Check zone size validity and compatibility */
- if (!zone_sectors || !is_power_of_2(zone_sectors))
- return -EINVAL;
- if (dm_table_any_dev_attr(t, device_not_matches_zone_sectors, &zone_sectors)) {
- DMERR("%s: zone sectors is not consistent across all zoned devices",
- dm_device_name(t->md));
- return -EINVAL;
- }
- return 0;
- }
- /*
- * Establish the new table's queue_limits and validate them.
- */
- int dm_calculate_queue_limits(struct dm_table *t,
- struct queue_limits *limits)
- {
- struct queue_limits ti_limits;
- enum blk_zoned_model zoned_model = BLK_ZONED_NONE;
- unsigned int zone_sectors = 0;
- blk_set_stacking_limits(limits);
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- blk_set_stacking_limits(&ti_limits);
- if (!ti->type->iterate_devices)
- goto combine_limits;
- /*
- * Combine queue limits of all the devices this target uses.
- */
- ti->type->iterate_devices(ti, dm_set_device_limits,
- &ti_limits);
- if (zoned_model == BLK_ZONED_NONE && ti_limits.zoned != BLK_ZONED_NONE) {
- /*
- * After stacking all limits, validate all devices
- * in table support this zoned model and zone sectors.
- */
- zoned_model = ti_limits.zoned;
- zone_sectors = ti_limits.chunk_sectors;
- }
- /* Set I/O hints portion of queue limits */
- if (ti->type->io_hints)
- ti->type->io_hints(ti, &ti_limits);
- /*
- * Check each device area is consistent with the target's
- * overall queue limits.
- */
- if (ti->type->iterate_devices(ti, device_area_is_invalid,
- &ti_limits))
- return -EINVAL;
- combine_limits:
- /*
- * Merge this target's queue limits into the overall limits
- * for the table.
- */
- if (blk_stack_limits(limits, &ti_limits, 0) < 0)
- DMWARN("%s: adding target device (start sect %llu len %llu) "
- "caused an alignment inconsistency",
- dm_device_name(t->md),
- (unsigned long long) ti->begin,
- (unsigned long long) ti->len);
- }
- /*
- * Verify that the zoned model and zone sectors, as determined before
- * any .io_hints override, are the same across all devices in the table.
- * - this is especially relevant if .io_hints is emulating a disk-managed
- * zoned model (aka BLK_ZONED_NONE) on host-managed zoned block devices.
- * BUT...
- */
- if (limits->zoned != BLK_ZONED_NONE) {
- /*
- * ...IF the above limits stacking determined a zoned model
- * validate that all of the table's devices conform to it.
- */
- zoned_model = limits->zoned;
- zone_sectors = limits->chunk_sectors;
- }
- if (validate_hardware_zoned_model(t, zoned_model, zone_sectors))
- return -EINVAL;
- return validate_hardware_logical_block_alignment(t, limits);
- }
- /*
- * 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_verify_integrity(struct dm_table *t)
- {
- struct gendisk *template_disk = NULL;
- if (t->integrity_added)
- 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;
- }
- 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,
- sector_t start, sector_t len, void *data)
- {
- unsigned long flush = (unsigned long) data;
- struct request_queue *q = bdev_get_queue(dev->bdev);
- return (q->queue_flags & flush);
- }
- static bool dm_table_supports_flush(struct dm_table *t, unsigned long flush)
- {
- /*
- * Require at least one underlying device to support flushes.
- * t->devices includes internal dm devices such as mirror logs
- * so we need to use iterate_devices here, which targets
- * supporting flushes must provide.
- */
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->num_flush_bios)
- continue;
- if (ti->flush_supported)
- return true;
- if (ti->type->iterate_devices &&
- ti->type->iterate_devices(ti, device_flush_capable, (void *) flush))
- return true;
- }
- return false;
- }
- static int device_dax_write_cache_enabled(struct dm_target *ti,
- struct dm_dev *dev, sector_t start,
- sector_t len, void *data)
- {
- struct dax_device *dax_dev = dev->dax_dev;
- if (!dax_dev)
- return false;
- if (dax_write_cache_enabled(dax_dev))
- return true;
- return false;
- }
- static int device_is_rotational(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- return !bdev_nonrot(dev->bdev);
- }
- static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct request_queue *q = bdev_get_queue(dev->bdev);
- return !blk_queue_add_random(q);
- }
- static int device_not_write_zeroes_capable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- struct request_queue *q = bdev_get_queue(dev->bdev);
- return !q->limits.max_write_zeroes_sectors;
- }
- static bool dm_table_supports_write_zeroes(struct dm_table *t)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->num_write_zeroes_bios)
- return false;
- if (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, device_not_write_zeroes_capable, NULL))
- return false;
- }
- return true;
- }
- static int device_not_nowait_capable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- return !bdev_nowait(dev->bdev);
- }
- static bool dm_table_supports_nowait(struct dm_table *t)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!dm_target_supports_nowait(ti->type))
- return false;
- if (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, device_not_nowait_capable, NULL))
- return false;
- }
- return true;
- }
- static int device_not_discard_capable(struct dm_target *ti, struct dm_dev *dev,
- sector_t start, sector_t len, void *data)
- {
- return !bdev_max_discard_sectors(dev->bdev);
- }
- static bool dm_table_supports_discards(struct dm_table *t)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->num_discard_bios)
- return false;
- /*
- * Either the target provides discard support (as implied by setting
- * 'discards_supported') or it relies on _all_ data devices having
- * discard support.
- */
- if (!ti->discards_supported &&
- (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, device_not_discard_capable, NULL)))
- return false;
- }
- return true;
- }
- static int device_not_secure_erase_capable(struct dm_target *ti,
- struct dm_dev *dev, sector_t start,
- sector_t len, void *data)
- {
- return !bdev_max_secure_erase_sectors(dev->bdev);
- }
- static bool dm_table_supports_secure_erase(struct dm_table *t)
- {
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->num_secure_erase_bios)
- return false;
- if (!ti->type->iterate_devices ||
- ti->type->iterate_devices(ti, device_not_secure_erase_capable, NULL))
- return false;
- }
- return true;
- }
- static int device_requires_stable_pages(struct dm_target *ti,
- struct dm_dev *dev, sector_t start,
- sector_t len, void *data)
- {
- return bdev_stable_writes(dev->bdev);
- }
- int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
- struct queue_limits *limits)
- {
- bool wc = false, fua = false;
- int r;
- /*
- * Copy table's limits to the DM device's request_queue
- */
- q->limits = *limits;
- if (dm_table_supports_nowait(t))
- blk_queue_flag_set(QUEUE_FLAG_NOWAIT, q);
- else
- blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, q);
- if (!dm_table_supports_discards(t)) {
- q->limits.max_discard_sectors = 0;
- q->limits.max_hw_discard_sectors = 0;
- q->limits.discard_granularity = 0;
- q->limits.discard_alignment = 0;
- q->limits.discard_misaligned = 0;
- }
- if (!dm_table_supports_secure_erase(t))
- q->limits.max_secure_erase_sectors = 0;
- if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
- wc = true;
- if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA)))
- fua = true;
- }
- blk_queue_write_cache(q, wc, fua);
- if (dm_table_supports_dax(t, device_not_dax_capable)) {
- blk_queue_flag_set(QUEUE_FLAG_DAX, q);
- if (dm_table_supports_dax(t, device_not_dax_synchronous_capable))
- set_dax_synchronous(t->md->dax_dev);
- }
- else
- blk_queue_flag_clear(QUEUE_FLAG_DAX, q);
- if (dm_table_any_dev_attr(t, device_dax_write_cache_enabled, NULL))
- dax_write_cache(t->md->dax_dev, true);
- /* Ensure that all underlying devices are non-rotational. */
- if (dm_table_any_dev_attr(t, device_is_rotational, NULL))
- blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
- else
- blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
- if (!dm_table_supports_write_zeroes(t))
- q->limits.max_write_zeroes_sectors = 0;
- dm_table_verify_integrity(t);
- /*
- * Some devices don't use blk_integrity but still want stable pages
- * because they do their own checksumming.
- * If any underlying device requires stable pages, a table must require
- * them as well. Only targets that support iterate_devices are considered:
- * don't want error, zero, etc to require stable pages.
- */
- if (dm_table_any_dev_attr(t, device_requires_stable_pages, NULL))
- blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q);
- else
- blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, q);
- /*
- * Determine whether or not this queue's I/O timings contribute
- * to the entropy pool, Only request-based targets use this.
- * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
- * have it set.
- */
- if (blk_queue_add_random(q) &&
- dm_table_any_dev_attr(t, device_is_not_random, NULL))
- blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
- /*
- * For a zoned target, setup the zones related queue attributes
- * and resources necessary for zone append emulation if necessary.
- */
- if (blk_queue_is_zoned(q)) {
- r = dm_set_zones_restrictions(t, q);
- if (r)
- return r;
- if (!static_key_enabled(&zoned_enabled.key))
- static_branch_enable(&zoned_enabled);
- }
- dm_update_crypto_profile(q, t);
- disk_update_readahead(t->md->disk);
- /*
- * Check for request-based device is left to
- * dm_mq_init_request_queue()->blk_mq_init_allocated_queue().
- *
- * For bio-based device, only set QUEUE_FLAG_POLL when all
- * underlying devices supporting polling.
- */
- if (__table_type_bio_based(t->type)) {
- if (dm_table_supports_poll(t))
- blk_queue_flag_set(QUEUE_FLAG_POLL, q);
- else
- blk_queue_flag_clear(QUEUE_FLAG_POLL, q);
- }
- return 0;
- }
- struct list_head *dm_table_get_devices(struct dm_table *t)
- {
- return &t->devices;
- }
- fmode_t dm_table_get_mode(struct dm_table *t)
- {
- return t->mode;
- }
- EXPORT_SYMBOL(dm_table_get_mode);
- enum suspend_mode {
- PRESUSPEND,
- PRESUSPEND_UNDO,
- POSTSUSPEND,
- };
- static void suspend_targets(struct dm_table *t, enum suspend_mode mode)
- {
- lockdep_assert_held(&t->md->suspend_lock);
- for (unsigned int i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- switch (mode) {
- case PRESUSPEND:
- if (ti->type->presuspend)
- ti->type->presuspend(ti);
- break;
- case PRESUSPEND_UNDO:
- if (ti->type->presuspend_undo)
- ti->type->presuspend_undo(ti);
- break;
- case POSTSUSPEND:
- if (ti->type->postsuspend)
- ti->type->postsuspend(ti);
- break;
- }
- }
- }
- void dm_table_presuspend_targets(struct dm_table *t)
- {
- if (!t)
- return;
- suspend_targets(t, PRESUSPEND);
- }
- void dm_table_presuspend_undo_targets(struct dm_table *t)
- {
- if (!t)
- return;
- suspend_targets(t, PRESUSPEND_UNDO);
- }
- void dm_table_postsuspend_targets(struct dm_table *t)
- {
- if (!t)
- return;
- suspend_targets(t, POSTSUSPEND);
- }
- int dm_table_resume_targets(struct dm_table *t)
- {
- unsigned int i;
- int r = 0;
- lockdep_assert_held(&t->md->suspend_lock);
- for (i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (!ti->type->preresume)
- continue;
- r = ti->type->preresume(ti);
- if (r) {
- DMERR("%s: %s: preresume failed, error = %d",
- dm_device_name(t->md), ti->type->name, r);
- return r;
- }
- }
- for (i = 0; i < t->num_targets; i++) {
- struct dm_target *ti = dm_table_get_target(t, i);
- if (ti->type->resume)
- ti->type->resume(ti);
- }
- return 0;
- }
- struct mapped_device *dm_table_get_md(struct dm_table *t)
- {
- return t->md;
- }
- EXPORT_SYMBOL(dm_table_get_md);
- const char *dm_table_device_name(struct dm_table *t)
- {
- return dm_device_name(t->md);
- }
- EXPORT_SYMBOL_GPL(dm_table_device_name);
- void dm_table_run_md_queue_async(struct dm_table *t)
- {
- if (!dm_table_request_based(t))
- return;
- if (t->md->queue)
- blk_mq_run_hw_queues(t->md->queue, true);
- }
- EXPORT_SYMBOL(dm_table_run_md_queue_async);
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