struct list_head *head = &info->space_info;
struct btrfs_space_info *found;
- flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM |
- BTRFS_BLOCK_GROUP_METADATA;
+ flags &= BTRFS_BLOCK_GROUP_TYPE_MASK;
rcu_read_lock();
list_for_each_entry_rcu(found, head, list) {
BUG_ON(ret);
kfree(extent_op);
- cond_resched();
- spin_lock(&delayed_refs->lock);
- continue;
+ goto next;
}
list_del_init(&locked_ref->cluster);
btrfs_put_delayed_ref(ref);
kfree(extent_op);
count++;
-
+next:
+ do_chunk_alloc(trans, root->fs_info->extent_root,
+ 2 * 1024 * 1024,
+ btrfs_get_alloc_profile(root, 0),
+ CHUNK_ALLOC_NO_FORCE);
cond_resched();
spin_lock(&delayed_refs->lock);
}
if (root == root->fs_info->extent_root)
root = root->fs_info->tree_root;
+ do_chunk_alloc(trans, root->fs_info->extent_root,
+ 2 * 1024 * 1024, btrfs_get_alloc_profile(root, 0),
+ CHUNK_ALLOC_NO_FORCE);
+
delayed_refs = &trans->transaction->delayed_refs;
INIT_LIST_HEAD(&cluster);
again:
INIT_LIST_HEAD(&found->block_groups[i]);
init_rwsem(&found->groups_sem);
spin_lock_init(&found->lock);
- found->flags = flags & (BTRFS_BLOCK_GROUP_DATA |
- BTRFS_BLOCK_GROUP_SYSTEM |
- BTRFS_BLOCK_GROUP_METADATA);
+ found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK;
found->total_bytes = total_bytes;
found->disk_total = total_bytes * factor;
found->bytes_used = bytes_used;
static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
{
- u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 |
- BTRFS_BLOCK_GROUP_RAID1 |
- BTRFS_BLOCK_GROUP_RAID10 |
- BTRFS_BLOCK_GROUP_DUP);
- if (extra_flags) {
- if (flags & BTRFS_BLOCK_GROUP_DATA)
- fs_info->avail_data_alloc_bits |= extra_flags;
- if (flags & BTRFS_BLOCK_GROUP_METADATA)
- fs_info->avail_metadata_alloc_bits |= extra_flags;
- if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
- fs_info->avail_system_alloc_bits |= extra_flags;
- }
+ u64 extra_flags = flags & BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+ /* chunk -> extended profile */
+ if (extra_flags == 0)
+ extra_flags = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+ if (flags & BTRFS_BLOCK_GROUP_DATA)
+ fs_info->avail_data_alloc_bits |= extra_flags;
+ if (flags & BTRFS_BLOCK_GROUP_METADATA)
+ fs_info->avail_metadata_alloc_bits |= extra_flags;
+ if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
+ fs_info->avail_system_alloc_bits |= extra_flags;
}
+ /*
+ * @flags: available profiles in extended format (see ctree.h)
+ *
+ * Returns reduced profile in chunk format. If profile changing is in
+ * progress (either running or paused) picks the target profile (if it's
+ * already available), otherwise falls back to plain reducing.
+ */
u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
{
/*
u64 num_devices = root->fs_info->fs_devices->rw_devices +
root->fs_info->fs_devices->missing_devices;
+ /* pick restriper's target profile if it's available */
+ spin_lock(&root->fs_info->balance_lock);
+ if (root->fs_info->balance_ctl) {
+ struct btrfs_balance_control *bctl = root->fs_info->balance_ctl;
+ u64 tgt = 0;
+
+ if ((flags & BTRFS_BLOCK_GROUP_DATA) &&
+ (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
+ (flags & bctl->data.target)) {
+ tgt = BTRFS_BLOCK_GROUP_DATA | bctl->data.target;
+ } else if ((flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
+ (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
+ (flags & bctl->sys.target)) {
+ tgt = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target;
+ } else if ((flags & BTRFS_BLOCK_GROUP_METADATA) &&
+ (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
+ (flags & bctl->meta.target)) {
+ tgt = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target;
+ }
+
+ if (tgt) {
+ spin_unlock(&root->fs_info->balance_lock);
+ flags = tgt;
+ goto out;
+ }
+ }
+ spin_unlock(&root->fs_info->balance_lock);
+
if (num_devices == 1)
flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0);
if (num_devices < 4)
if ((flags & BTRFS_BLOCK_GROUP_RAID0) &&
((flags & BTRFS_BLOCK_GROUP_RAID1) |
(flags & BTRFS_BLOCK_GROUP_RAID10) |
- (flags & BTRFS_BLOCK_GROUP_DUP)))
+ (flags & BTRFS_BLOCK_GROUP_DUP))) {
flags &= ~BTRFS_BLOCK_GROUP_RAID0;
+ }
+
+ out:
+ /* extended -> chunk profile */
+ flags &= ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
return flags;
}
static u64 get_alloc_profile(struct btrfs_root *root, u64 flags)
{
if (flags & BTRFS_BLOCK_GROUP_DATA)
- flags |= root->fs_info->avail_data_alloc_bits &
- root->fs_info->data_alloc_profile;
+ flags |= root->fs_info->avail_data_alloc_bits;
else if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
- flags |= root->fs_info->avail_system_alloc_bits &
- root->fs_info->system_alloc_profile;
+ flags |= root->fs_info->avail_system_alloc_bits;
else if (flags & BTRFS_BLOCK_GROUP_METADATA)
- flags |= root->fs_info->avail_metadata_alloc_bits &
- root->fs_info->metadata_alloc_profile;
+ flags |= root->fs_info->avail_metadata_alloc_bits;
+
return btrfs_reduce_alloc_profile(root, flags);
}
if (num_bytes - num_allocated < thresh)
return 1;
}
-
- /*
- * we have two similar checks here, one based on percentage
- * and once based on a hard number of 256MB. The idea
- * is that if we have a good amount of free
- * room, don't allocate a chunk. A good mount is
- * less than 80% utilized of the chunks we have allocated,
- * or more than 256MB free
- */
- if (num_allocated + alloc_bytes + 256 * 1024 * 1024 < num_bytes)
- return 0;
-
- if (num_allocated + alloc_bytes < div_factor(num_bytes, 8))
- return 0;
-
thresh = btrfs_super_total_bytes(root->fs_info->super_copy);
- /* 256MB or 5% of the FS */
- thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5));
+ /* 256MB or 2% of the FS */
+ thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 2));
- if (num_bytes > thresh && sinfo->bytes_used < div_factor(num_bytes, 3))
+ if (num_bytes > thresh && sinfo->bytes_used < div_factor(num_bytes, 8))
return 0;
return 1;
}
int wait_for_alloc = 0;
int ret = 0;
- flags = btrfs_reduce_alloc_profile(extent_root, flags);
+ BUG_ON(!profile_is_valid(flags, 0));
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {
smp_mb();
nr_pages = min_t(unsigned long, nr_pages,
root->fs_info->delalloc_bytes >> PAGE_CACHE_SHIFT);
- writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages);
+ writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages,
+ WB_REASON_FS_FREE_SPACE);
spin_lock(&space_info->lock);
if (reserved > space_info->bytes_may_use)
if (unlikely(block_group->ro))
goto loop;
- spin_lock(&block_group->free_space_ctl->tree_lock);
- if (cached &&
- block_group->free_space_ctl->free_space <
- num_bytes + empty_cluster + empty_size) {
- spin_unlock(&block_group->free_space_ctl->tree_lock);
- goto loop;
- }
- spin_unlock(&block_group->free_space_ctl->tree_lock);
-
/*
* Ok we want to try and use the cluster allocator, so
* lets look there
* plenty of times and not have found
* anything, so we are likely way too
* fragmented for the clustering stuff to find
- * anything. */
- if (loop >= LOOP_NO_EMPTY_SIZE) {
+ * anything.
+ *
+ * However, if the cluster is taken from the
+ * current block group, release the cluster
+ * first, so that we stand a better chance of
+ * succeeding in the unclustered
+ * allocation. */
+ if (loop >= LOOP_NO_EMPTY_SIZE &&
+ last_ptr->block_group != block_group) {
spin_unlock(&last_ptr->refill_lock);
goto unclustered_alloc;
}
*/
btrfs_return_cluster_to_free_space(NULL, last_ptr);
+ if (loop >= LOOP_NO_EMPTY_SIZE) {
+ spin_unlock(&last_ptr->refill_lock);
+ goto unclustered_alloc;
+ }
+
/* allocate a cluster in this block group */
ret = btrfs_find_space_cluster(trans, root,
block_group, last_ptr,
}
unclustered_alloc:
+ spin_lock(&block_group->free_space_ctl->tree_lock);
+ if (cached &&
+ block_group->free_space_ctl->free_space <
+ num_bytes + empty_cluster + empty_size) {
+ spin_unlock(&block_group->free_space_ctl->tree_lock);
+ goto loop;
+ }
+ spin_unlock(&block_group->free_space_ctl->tree_lock);
+
offset = btrfs_find_space_for_alloc(block_group, search_start,
num_bytes, empty_size);
/*
goto loop;
}
- ins->objectid = search_start;
- ins->offset = num_bytes;
-
if (offset < search_start)
btrfs_add_free_space(used_block_group, offset,
search_start - offset);
u64 stripped = BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
+ if (root->fs_info->balance_ctl) {
+ struct btrfs_balance_control *bctl = root->fs_info->balance_ctl;
+ u64 tgt = 0;
+
+ /* pick restriper's target profile and return */
+ if (flags & BTRFS_BLOCK_GROUP_DATA &&
+ bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) {
+ tgt = BTRFS_BLOCK_GROUP_DATA | bctl->data.target;
+ } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM &&
+ bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
+ tgt = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target;
+ } else if (flags & BTRFS_BLOCK_GROUP_METADATA &&
+ bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) {
+ tgt = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target;
+ }
+
+ if (tgt) {
+ /* extended -> chunk profile */
+ tgt &= ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+ return tgt;
+ }
+ }
+
/*
* we add in the count of missing devices because we want
* to make sure that any RAID levels on a degraded FS
return 0;
}
+ static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
+ {
+ u64 extra_flags = flags & BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+ /* chunk -> extended profile */
+ if (extra_flags == 0)
+ extra_flags = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+ if (flags & BTRFS_BLOCK_GROUP_DATA)
+ fs_info->avail_data_alloc_bits &= ~extra_flags;
+ if (flags & BTRFS_BLOCK_GROUP_METADATA)
+ fs_info->avail_metadata_alloc_bits &= ~extra_flags;
+ if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
+ fs_info->avail_system_alloc_bits &= ~extra_flags;
+ }
+
int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 group_start)
{
struct btrfs_key key;
struct inode *inode;
int ret;
+ int index;
int factor;
root = root->fs_info->extent_root;
free_excluded_extents(root, block_group);
memcpy(&key, &block_group->key, sizeof(key));
+ index = get_block_group_index(block_group);
if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP |
BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10))
* are still on the list after taking the semaphore
*/
list_del_init(&block_group->list);
+ if (list_empty(&block_group->space_info->block_groups[index]))
+ clear_avail_alloc_bits(root->fs_info, block_group->flags);
up_write(&block_group->space_info->groups_sem);
if (block_group->cached == BTRFS_CACHE_STARTED)
#include <linux/random.h>
#include <linux/iocontext.h>
#include <linux/capability.h>
+ #include <linux/kthread.h>
#include <asm/div64.h>
#include "compat.h"
#include "ctree.h"
bool clear_super = false;
mutex_lock(&uuid_mutex);
- mutex_lock(&root->fs_info->volume_mutex);
all_avail = root->fs_info->avail_data_alloc_bits |
root->fs_info->avail_system_alloc_bits |
if (bdev)
blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
out:
- mutex_unlock(&root->fs_info->volume_mutex);
mutex_unlock(&uuid_mutex);
return ret;
error_undo:
}
filemap_write_and_wait(bdev->bd_inode->i_mapping);
- mutex_lock(&root->fs_info->volume_mutex);
devices = &root->fs_info->fs_devices->devices;
/*
ret = btrfs_relocate_sys_chunks(root);
BUG_ON(ret);
}
- out:
- mutex_unlock(&root->fs_info->volume_mutex);
+
return ret;
error:
blkdev_put(bdev, FMODE_EXCL);
mutex_unlock(&uuid_mutex);
up_write(&sb->s_umount);
}
- goto out;
+ return ret;
}
static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
return ret;
}
+ static int insert_balance_item(struct btrfs_root *root,
+ struct btrfs_balance_control *bctl)
+ {
+ struct btrfs_trans_handle *trans;
+ struct btrfs_balance_item *item;
+ struct btrfs_disk_balance_args disk_bargs;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_key key;
+ int ret, err;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ trans = btrfs_start_transaction(root, 0);
+ if (IS_ERR(trans)) {
+ btrfs_free_path(path);
+ return PTR_ERR(trans);
+ }
+
+ key.objectid = BTRFS_BALANCE_OBJECTID;
+ key.type = BTRFS_BALANCE_ITEM_KEY;
+ key.offset = 0;
+
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ sizeof(*item));
+ if (ret)
+ goto out;
+
+ leaf = path->nodes[0];
+ item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
+
+ memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
+
+ btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data);
+ btrfs_set_balance_data(leaf, item, &disk_bargs);
+ btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta);
+ btrfs_set_balance_meta(leaf, item, &disk_bargs);
+ btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys);
+ btrfs_set_balance_sys(leaf, item, &disk_bargs);
+
+ btrfs_set_balance_flags(leaf, item, bctl->flags);
+
+ btrfs_mark_buffer_dirty(leaf);
+ out:
+ btrfs_free_path(path);
+ err = btrfs_commit_transaction(trans, root);
+ if (err && !ret)
+ ret = err;
+ return ret;
+ }
+
+ static int del_balance_item(struct btrfs_root *root)
+ {
+ struct btrfs_trans_handle *trans;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret, err;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ trans = btrfs_start_transaction(root, 0);
+ if (IS_ERR(trans)) {
+ btrfs_free_path(path);
+ return PTR_ERR(trans);
+ }
+
+ key.objectid = BTRFS_BALANCE_OBJECTID;
+ key.type = BTRFS_BALANCE_ITEM_KEY;
+ key.offset = 0;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = btrfs_del_item(trans, root, path);
+ out:
+ btrfs_free_path(path);
+ err = btrfs_commit_transaction(trans, root);
+ if (err && !ret)
+ ret = err;
+ return ret;
+ }
+
+ /*
+ * This is a heuristic used to reduce the number of chunks balanced on
+ * resume after balance was interrupted.
+ */
+ static void update_balance_args(struct btrfs_balance_control *bctl)
+ {
+ /*
+ * Turn on soft mode for chunk types that were being converted.
+ */
+ if (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)
+ bctl->data.flags |= BTRFS_BALANCE_ARGS_SOFT;
+ if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)
+ bctl->sys.flags |= BTRFS_BALANCE_ARGS_SOFT;
+ if (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)
+ bctl->meta.flags |= BTRFS_BALANCE_ARGS_SOFT;
+
+ /*
+ * Turn on usage filter if is not already used. The idea is
+ * that chunks that we have already balanced should be
+ * reasonably full. Don't do it for chunks that are being
+ * converted - that will keep us from relocating unconverted
+ * (albeit full) chunks.
+ */
+ if (!(bctl->data.flags & BTRFS_BALANCE_ARGS_USAGE) &&
+ !(bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
+ bctl->data.flags |= BTRFS_BALANCE_ARGS_USAGE;
+ bctl->data.usage = 90;
+ }
+ if (!(bctl->sys.flags & BTRFS_BALANCE_ARGS_USAGE) &&
+ !(bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
+ bctl->sys.flags |= BTRFS_BALANCE_ARGS_USAGE;
+ bctl->sys.usage = 90;
+ }
+ if (!(bctl->meta.flags & BTRFS_BALANCE_ARGS_USAGE) &&
+ !(bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT)) {
+ bctl->meta.flags |= BTRFS_BALANCE_ARGS_USAGE;
+ bctl->meta.usage = 90;
+ }
+ }
+
+ /*
+ * Should be called with both balance and volume mutexes held to
+ * serialize other volume operations (add_dev/rm_dev/resize) with
+ * restriper. Same goes for unset_balance_control.
+ */
+ static void set_balance_control(struct btrfs_balance_control *bctl)
+ {
+ struct btrfs_fs_info *fs_info = bctl->fs_info;
+
+ BUG_ON(fs_info->balance_ctl);
+
+ spin_lock(&fs_info->balance_lock);
+ fs_info->balance_ctl = bctl;
+ spin_unlock(&fs_info->balance_lock);
+ }
+
+ static void unset_balance_control(struct btrfs_fs_info *fs_info)
+ {
+ struct btrfs_balance_control *bctl = fs_info->balance_ctl;
+
+ BUG_ON(!fs_info->balance_ctl);
+
+ spin_lock(&fs_info->balance_lock);
+ fs_info->balance_ctl = NULL;
+ spin_unlock(&fs_info->balance_lock);
+
+ kfree(bctl);
+ }
+
+ /*
+ * Balance filters. Return 1 if chunk should be filtered out
+ * (should not be balanced).
+ */
+ static int chunk_profiles_filter(u64 chunk_profile,
+ struct btrfs_balance_args *bargs)
+ {
+ chunk_profile &= BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+ if (chunk_profile == 0)
+ chunk_profile = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+ if (bargs->profiles & chunk_profile)
+ return 0;
+
+ return 1;
+ }
+
+ static u64 div_factor_fine(u64 num, int factor)
+ {
+ if (factor <= 0)
+ return 0;
+ if (factor >= 100)
+ return num;
+
+ num *= factor;
+ do_div(num, 100);
+ return num;
+ }
+
+ static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
+ struct btrfs_balance_args *bargs)
+ {
+ struct btrfs_block_group_cache *cache;
+ u64 chunk_used, user_thresh;
+ int ret = 1;
+
+ cache = btrfs_lookup_block_group(fs_info, chunk_offset);
+ chunk_used = btrfs_block_group_used(&cache->item);
+
+ user_thresh = div_factor_fine(cache->key.offset, bargs->usage);
+ if (chunk_used < user_thresh)
+ ret = 0;
+
+ btrfs_put_block_group(cache);
+ return ret;
+ }
+
+ static int chunk_devid_filter(struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ struct btrfs_balance_args *bargs)
+ {
+ struct btrfs_stripe *stripe;
+ int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ int i;
+
+ for (i = 0; i < num_stripes; i++) {
+ stripe = btrfs_stripe_nr(chunk, i);
+ if (btrfs_stripe_devid(leaf, stripe) == bargs->devid)
+ return 0;
+ }
+
+ return 1;
+ }
+
+ /* [pstart, pend) */
+ static int chunk_drange_filter(struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ u64 chunk_offset,
+ struct btrfs_balance_args *bargs)
+ {
+ struct btrfs_stripe *stripe;
+ int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ u64 stripe_offset;
+ u64 stripe_length;
+ int factor;
+ int i;
+
+ if (!(bargs->flags & BTRFS_BALANCE_ARGS_DEVID))
+ return 0;
+
+ if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP |
+ BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10))
+ factor = 2;
+ else
+ factor = 1;
+ factor = num_stripes / factor;
+
+ for (i = 0; i < num_stripes; i++) {
+ stripe = btrfs_stripe_nr(chunk, i);
+ if (btrfs_stripe_devid(leaf, stripe) != bargs->devid)
+ continue;
+
+ stripe_offset = btrfs_stripe_offset(leaf, stripe);
+ stripe_length = btrfs_chunk_length(leaf, chunk);
+ do_div(stripe_length, factor);
+
+ if (stripe_offset < bargs->pend &&
+ stripe_offset + stripe_length > bargs->pstart)
+ return 0;
+ }
+
+ return 1;
+ }
+
+ /* [vstart, vend) */
+ static int chunk_vrange_filter(struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ u64 chunk_offset,
+ struct btrfs_balance_args *bargs)
+ {
+ if (chunk_offset < bargs->vend &&
+ chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart)
+ /* at least part of the chunk is inside this vrange */
+ return 0;
+
+ return 1;
+ }
+
+ static int chunk_soft_convert_filter(u64 chunk_profile,
+ struct btrfs_balance_args *bargs)
+ {
+ if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT))
+ return 0;
+
+ chunk_profile &= BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+ if (chunk_profile == 0)
+ chunk_profile = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+ if (bargs->target & chunk_profile)
+ return 1;
+
+ return 0;
+ }
+
+ static int should_balance_chunk(struct btrfs_root *root,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk, u64 chunk_offset)
+ {
+ struct btrfs_balance_control *bctl = root->fs_info->balance_ctl;
+ struct btrfs_balance_args *bargs = NULL;
+ u64 chunk_type = btrfs_chunk_type(leaf, chunk);
+
+ /* type filter */
+ if (!((chunk_type & BTRFS_BLOCK_GROUP_TYPE_MASK) &
+ (bctl->flags & BTRFS_BALANCE_TYPE_MASK))) {
+ return 0;
+ }
+
+ if (chunk_type & BTRFS_BLOCK_GROUP_DATA)
+ bargs = &bctl->data;
+ else if (chunk_type & BTRFS_BLOCK_GROUP_SYSTEM)
+ bargs = &bctl->sys;
+ else if (chunk_type & BTRFS_BLOCK_GROUP_METADATA)
+ bargs = &bctl->meta;
+
+ /* profiles filter */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_PROFILES) &&
+ chunk_profiles_filter(chunk_type, bargs)) {
+ return 0;
+ }
+
+ /* usage filter */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_USAGE) &&
+ chunk_usage_filter(bctl->fs_info, chunk_offset, bargs)) {
+ return 0;
+ }
+
+ /* devid filter */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_DEVID) &&
+ chunk_devid_filter(leaf, chunk, bargs)) {
+ return 0;
+ }
+
+ /* drange filter, makes sense only with devid filter */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
+ chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) {
+ return 0;
+ }
+
+ /* vrange filter */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) &&
+ chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) {
+ return 0;
+ }
+
+ /* soft profile changing mode */
+ if ((bargs->flags & BTRFS_BALANCE_ARGS_SOFT) &&
+ chunk_soft_convert_filter(chunk_type, bargs)) {
+ return 0;
+ }
+
+ return 1;
+ }
+
static u64 div_factor(u64 num, int factor)
{
if (factor == 10)
return num;
}
- int btrfs_balance(struct btrfs_root *dev_root)
+ static int __btrfs_balance(struct btrfs_fs_info *fs_info)
{
- int ret;
- struct list_head *devices = &dev_root->fs_info->fs_devices->devices;
+ struct btrfs_balance_control *bctl = fs_info->balance_ctl;
+ struct btrfs_root *chunk_root = fs_info->chunk_root;
+ struct btrfs_root *dev_root = fs_info->dev_root;
+ struct list_head *devices;
struct btrfs_device *device;
u64 old_size;
u64 size_to_free;
+ struct btrfs_chunk *chunk;
struct btrfs_path *path;
struct btrfs_key key;
- struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root;
- struct btrfs_trans_handle *trans;
struct btrfs_key found_key;
-
- if (dev_root->fs_info->sb->s_flags & MS_RDONLY)
- return -EROFS;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- mutex_lock(&dev_root->fs_info->volume_mutex);
- dev_root = dev_root->fs_info->dev_root;
+ struct btrfs_trans_handle *trans;
+ struct extent_buffer *leaf;
+ int slot;
+ int ret;
+ int enospc_errors = 0;
+ bool counting = true;
/* step one make some room on all the devices */
+ devices = &fs_info->fs_devices->devices;
list_for_each_entry(device, devices, dev_list) {
old_size = device->total_bytes;
size_to_free = div_factor(old_size, 1);
ret = -ENOMEM;
goto error;
}
+
+ /* zero out stat counters */
+ spin_lock(&fs_info->balance_lock);
+ memset(&bctl->stat, 0, sizeof(bctl->stat));
+ spin_unlock(&fs_info->balance_lock);
+ again:
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.offset = (u64)-1;
key.type = BTRFS_CHUNK_ITEM_KEY;
while (1) {
+ if ((!counting && atomic_read(&fs_info->balance_pause_req)) ||
+ atomic_read(&fs_info->balance_cancel_req)) {
+ ret = -ECANCELED;
+ goto error;
+ }
+
ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
if (ret < 0)
goto error;
* failed
*/
if (ret == 0)
- break;
+ BUG(); /* FIXME break ? */
ret = btrfs_previous_item(chunk_root, path, 0,
BTRFS_CHUNK_ITEM_KEY);
- if (ret)
+ if (ret) {
+ ret = 0;
break;
+ }
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, slot);
- btrfs_item_key_to_cpu(path->nodes[0], &found_key,
- path->slots[0]);
if (found_key.objectid != key.objectid)
break;
if (found_key.offset == 0)
break;
+ chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
+
+ if (!counting) {
+ spin_lock(&fs_info->balance_lock);
+ bctl->stat.considered++;
+ spin_unlock(&fs_info->balance_lock);
+ }
+
+ ret = should_balance_chunk(chunk_root, leaf, chunk,
+ found_key.offset);
btrfs_release_path(path);
+ if (!ret)
+ goto loop;
+
+ if (counting) {
+ spin_lock(&fs_info->balance_lock);
+ bctl->stat.expected++;
+ spin_unlock(&fs_info->balance_lock);
+ goto loop;
+ }
+
ret = btrfs_relocate_chunk(chunk_root,
chunk_root->root_key.objectid,
found_key.objectid,
found_key.offset);
if (ret && ret != -ENOSPC)
goto error;
+ if (ret == -ENOSPC) {
+ enospc_errors++;
+ } else {
+ spin_lock(&fs_info->balance_lock);
+ bctl->stat.completed++;
+ spin_unlock(&fs_info->balance_lock);
+ }
+ loop:
key.offset = found_key.offset - 1;
}
- ret = 0;
+
+ if (counting) {
+ btrfs_release_path(path);
+ counting = false;
+ goto again;
+ }
error:
btrfs_free_path(path);
- mutex_unlock(&dev_root->fs_info->volume_mutex);
+ if (enospc_errors) {
+ printk(KERN_INFO "btrfs: %d enospc errors during balance\n",
+ enospc_errors);
+ if (!ret)
+ ret = -ENOSPC;
+ }
+
return ret;
}
+ static inline int balance_need_close(struct btrfs_fs_info *fs_info)
+ {
+ /* cancel requested || normal exit path */
+ return atomic_read(&fs_info->balance_cancel_req) ||
+ (atomic_read(&fs_info->balance_pause_req) == 0 &&
+ atomic_read(&fs_info->balance_cancel_req) == 0);
+ }
+
+ static void __cancel_balance(struct btrfs_fs_info *fs_info)
+ {
+ int ret;
+
+ unset_balance_control(fs_info);
+ ret = del_balance_item(fs_info->tree_root);
+ BUG_ON(ret);
+ }
+
+ void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
+ struct btrfs_ioctl_balance_args *bargs);
+
+ /*
+ * Should be called with both balance and volume mutexes held
+ */
+ int btrfs_balance(struct btrfs_balance_control *bctl,
+ struct btrfs_ioctl_balance_args *bargs)
+ {
+ struct btrfs_fs_info *fs_info = bctl->fs_info;
+ u64 allowed;
+ int ret;
+
+ if (btrfs_fs_closing(fs_info) ||
+ atomic_read(&fs_info->balance_pause_req) ||
+ atomic_read(&fs_info->balance_cancel_req)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * In case of mixed groups both data and meta should be picked,
+ * and identical options should be given for both of them.
+ */
+ allowed = btrfs_super_incompat_flags(fs_info->super_copy);
+ if ((allowed & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
+ (bctl->flags & (BTRFS_BALANCE_DATA | BTRFS_BALANCE_METADATA))) {
+ if (!(bctl->flags & BTRFS_BALANCE_DATA) ||
+ !(bctl->flags & BTRFS_BALANCE_METADATA) ||
+ memcmp(&bctl->data, &bctl->meta, sizeof(bctl->data))) {
+ printk(KERN_ERR "btrfs: with mixed groups data and "
+ "metadata balance options must be the same\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ /*
+ * Profile changing sanity checks. Skip them if a simple
+ * balance is requested.
+ */
+ if (!((bctl->data.flags | bctl->sys.flags | bctl->meta.flags) &
+ BTRFS_BALANCE_ARGS_CONVERT))
+ goto do_balance;
+
+ allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+ if (fs_info->fs_devices->num_devices == 1)
+ allowed |= BTRFS_BLOCK_GROUP_DUP;
+ else if (fs_info->fs_devices->num_devices < 4)
+ allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
+ else
+ allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10);
+
+ if (!profile_is_valid(bctl->data.target, 1) ||
+ bctl->data.target & ~allowed) {
+ printk(KERN_ERR "btrfs: unable to start balance with target "
+ "data profile %llu\n",
+ (unsigned long long)bctl->data.target);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!profile_is_valid(bctl->meta.target, 1) ||
+ bctl->meta.target & ~allowed) {
+ printk(KERN_ERR "btrfs: unable to start balance with target "
+ "metadata profile %llu\n",
+ (unsigned long long)bctl->meta.target);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!profile_is_valid(bctl->sys.target, 1) ||
+ bctl->sys.target & ~allowed) {
+ printk(KERN_ERR "btrfs: unable to start balance with target "
+ "system profile %llu\n",
+ (unsigned long long)bctl->sys.target);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (bctl->data.target & BTRFS_BLOCK_GROUP_DUP) {
+ printk(KERN_ERR "btrfs: dup for data is not allowed\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* allow to reduce meta or sys integrity only if force set */
+ allowed = BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10;
+ if (((bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
+ (fs_info->avail_system_alloc_bits & allowed) &&
+ !(bctl->sys.target & allowed)) ||
+ ((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
+ (fs_info->avail_metadata_alloc_bits & allowed) &&
+ !(bctl->meta.target & allowed))) {
+ if (bctl->flags & BTRFS_BALANCE_FORCE) {
+ printk(KERN_INFO "btrfs: force reducing metadata "
+ "integrity\n");
+ } else {
+ printk(KERN_ERR "btrfs: balance will reduce metadata "
+ "integrity, use force if you want this\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ do_balance:
+ ret = insert_balance_item(fs_info->tree_root, bctl);
+ if (ret && ret != -EEXIST)
+ goto out;
+
+ if (!(bctl->flags & BTRFS_BALANCE_RESUME)) {
+ BUG_ON(ret == -EEXIST);
+ set_balance_control(bctl);
+ } else {
+ BUG_ON(ret != -EEXIST);
+ spin_lock(&fs_info->balance_lock);
+ update_balance_args(bctl);
+ spin_unlock(&fs_info->balance_lock);
+ }
+
+ atomic_inc(&fs_info->balance_running);
+ mutex_unlock(&fs_info->balance_mutex);
+
+ ret = __btrfs_balance(fs_info);
+
+ mutex_lock(&fs_info->balance_mutex);
+ atomic_dec(&fs_info->balance_running);
+
+ if (bargs) {
+ memset(bargs, 0, sizeof(*bargs));
+ update_ioctl_balance_args(fs_info, 0, bargs);
+ }
+
+ if ((ret && ret != -ECANCELED && ret != -ENOSPC) ||
+ balance_need_close(fs_info)) {
+ __cancel_balance(fs_info);
+ }
+
+ wake_up(&fs_info->balance_wait_q);
+
+ return ret;
+ out:
+ if (bctl->flags & BTRFS_BALANCE_RESUME)
+ __cancel_balance(fs_info);
+ else
+ kfree(bctl);
+ return ret;
+ }
+
+ static int balance_kthread(void *data)
+ {
+ struct btrfs_balance_control *bctl =
+ (struct btrfs_balance_control *)data;
+ struct btrfs_fs_info *fs_info = bctl->fs_info;
+ int ret = 0;
+
+ mutex_lock(&fs_info->volume_mutex);
+ mutex_lock(&fs_info->balance_mutex);
+
+ set_balance_control(bctl);
+
+ if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) {
+ printk(KERN_INFO "btrfs: force skipping balance\n");
+ } else {
+ printk(KERN_INFO "btrfs: continuing balance\n");
+ ret = btrfs_balance(bctl, NULL);
+ }
+
+ mutex_unlock(&fs_info->balance_mutex);
+ mutex_unlock(&fs_info->volume_mutex);
+ return ret;
+ }
+
+ int btrfs_recover_balance(struct btrfs_root *tree_root)
+ {
+ struct task_struct *tsk;
+ struct btrfs_balance_control *bctl;
+ struct btrfs_balance_item *item;
+ struct btrfs_disk_balance_args disk_bargs;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_key key;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
+ if (!bctl) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ key.objectid = BTRFS_BALANCE_OBJECTID;
+ key.type = BTRFS_BALANCE_ITEM_KEY;
+ key.offset = 0;
+
+ ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out_bctl;
+ if (ret > 0) { /* ret = -ENOENT; */
+ ret = 0;
+ goto out_bctl;
+ }
+
+ leaf = path->nodes[0];
+ item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
+
+ bctl->fs_info = tree_root->fs_info;
+ bctl->flags = btrfs_balance_flags(leaf, item) | BTRFS_BALANCE_RESUME;
+
+ btrfs_balance_data(leaf, item, &disk_bargs);
+ btrfs_disk_balance_args_to_cpu(&bctl->data, &disk_bargs);
+ btrfs_balance_meta(leaf, item, &disk_bargs);
+ btrfs_disk_balance_args_to_cpu(&bctl->meta, &disk_bargs);
+ btrfs_balance_sys(leaf, item, &disk_bargs);
+ btrfs_disk_balance_args_to_cpu(&bctl->sys, &disk_bargs);
+
+ tsk = kthread_run(balance_kthread, bctl, "btrfs-balance");
+ if (IS_ERR(tsk))
+ ret = PTR_ERR(tsk);
+ else
+ goto out;
+
+ out_bctl:
+ kfree(bctl);
+ out:
+ btrfs_free_path(path);
+ return ret;
+ }
+
+ int btrfs_pause_balance(struct btrfs_fs_info *fs_info)
+ {
+ int ret = 0;
+
+ mutex_lock(&fs_info->balance_mutex);
+ if (!fs_info->balance_ctl) {
+ mutex_unlock(&fs_info->balance_mutex);
+ return -ENOTCONN;
+ }
+
+ if (atomic_read(&fs_info->balance_running)) {
+ atomic_inc(&fs_info->balance_pause_req);
+ mutex_unlock(&fs_info->balance_mutex);
+
+ wait_event(fs_info->balance_wait_q,
+ atomic_read(&fs_info->balance_running) == 0);
+
+ mutex_lock(&fs_info->balance_mutex);
+ /* we are good with balance_ctl ripped off from under us */
+ BUG_ON(atomic_read(&fs_info->balance_running));
+ atomic_dec(&fs_info->balance_pause_req);
+ } else {
+ ret = -ENOTCONN;
+ }
+
+ mutex_unlock(&fs_info->balance_mutex);
+ return ret;
+ }
+
+ int btrfs_cancel_balance(struct btrfs_fs_info *fs_info)
+ {
+ mutex_lock(&fs_info->balance_mutex);
+ if (!fs_info->balance_ctl) {
+ mutex_unlock(&fs_info->balance_mutex);
+ return -ENOTCONN;
+ }
+
+ atomic_inc(&fs_info->balance_cancel_req);
+ /*
+ * if we are running just wait and return, balance item is
+ * deleted in btrfs_balance in this case
+ */
+ if (atomic_read(&fs_info->balance_running)) {
+ mutex_unlock(&fs_info->balance_mutex);
+ wait_event(fs_info->balance_wait_q,
+ atomic_read(&fs_info->balance_running) == 0);
+ mutex_lock(&fs_info->balance_mutex);
+ } else {
+ /* __cancel_balance needs volume_mutex */
+ mutex_unlock(&fs_info->balance_mutex);
+ mutex_lock(&fs_info->volume_mutex);
+ mutex_lock(&fs_info->balance_mutex);
+
+ if (fs_info->balance_ctl)
+ __cancel_balance(fs_info);
+
+ mutex_unlock(&fs_info->volume_mutex);
+ }
+
+ BUG_ON(fs_info->balance_ctl || atomic_read(&fs_info->balance_running));
+ atomic_dec(&fs_info->balance_cancel_req);
+ mutex_unlock(&fs_info->balance_mutex);
+ return 0;
+ }
+
/*
* shrinking a device means finding all of the device extents past
* the new size, and then following the back refs to the chunks.
max_stripe_size = 1024 * 1024 * 1024;
max_chunk_size = 10 * max_stripe_size;
} else if (type & BTRFS_BLOCK_GROUP_METADATA) {
- max_stripe_size = 256 * 1024 * 1024;
+ /* for larger filesystems, use larger metadata chunks */
+ if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024)
+ max_stripe_size = 1024 * 1024 * 1024;
+ else
+ max_stripe_size = 256 * 1024 * 1024;
max_chunk_size = max_stripe_size;
} else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
max_stripe_size = 8 * 1024 * 1024;
return ret;
alloc_profile = BTRFS_BLOCK_GROUP_METADATA |
- (fs_info->metadata_alloc_profile &
- fs_info->avail_metadata_alloc_bits);
+ fs_info->avail_metadata_alloc_bits;
alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile);
ret = __btrfs_alloc_chunk(trans, extent_root, &map, &chunk_size,
sys_chunk_offset = chunk_offset + chunk_size;
alloc_profile = BTRFS_BLOCK_GROUP_SYSTEM |
- (fs_info->system_alloc_profile &
- fs_info->avail_system_alloc_bits);
+ fs_info->avail_system_alloc_bits;
alloc_profile = btrfs_reduce_alloc_profile(root, alloc_profile);
ret = __btrfs_alloc_chunk(trans, extent_root, &sys_map,
}
}
if (rw & REQ_DISCARD) {
- if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
- BTRFS_BLOCK_GROUP_RAID1 |
- BTRFS_BLOCK_GROUP_DUP |
- BTRFS_BLOCK_GROUP_RAID10)) {
+ if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK)
stripes_required = map->num_stripes;
- }
}
if (bbio_ret && (rw & (REQ_WRITE | REQ_DISCARD)) &&
stripes_allocated < stripes_required) {
if (rw & REQ_DISCARD)
*length = min_t(u64, em->len - offset, *length);
- else if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
- BTRFS_BLOCK_GROUP_RAID1 |
- BTRFS_BLOCK_GROUP_RAID10 |
- BTRFS_BLOCK_GROUP_DUP)) {
+ else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
/* we limit the length of each bio to what fits in a stripe */
*length = min_t(u64, em->len - offset,
map->stripe_len - stripe_offset);
projects / linux-imx.git / commitdiff