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Btrfs: Add support for mirroring across drives

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-03 16:29:03 -04:00
parent 0ef8b2428a
commit 8790d502e4
6 changed files with 198 additions and 93 deletions
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9
fs/btrfs/ctree.h
View file

@ -418,6 +418,7 @@ struct btrfs_csum_item {
#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
struct btrfs_block_group_item {
@ -504,8 +505,12 @@ struct btrfs_fs_info {
u64 delalloc_bytes;
u64 last_alloc;
u64 last_data_alloc;
int extra_data_alloc_bits;
int extra_alloc_bits;
int avail_data_alloc_bits;
int avail_metadata_alloc_bits;
int avail_system_alloc_bits;
int data_alloc_profile;
int metadata_alloc_profile;
int system_alloc_profile;
};
/*

20
fs/btrfs/disk-io.c
View file

@ -735,7 +735,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
GFP_NOFS);
struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
GFP_NOFS);
struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
@ -744,6 +744,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
int ret;
int err = -EINVAL;
struct btrfs_super_block *disk_super;
if (!extent_root || !tree_root || !fs_info) {
err = -ENOMEM;
goto fail;
@ -756,11 +757,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
spin_lock_init(&fs_info->delalloc_lock);
spin_lock_init(&fs_info->new_trans_lock);
memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
init_completion(&fs_info->kobj_unregister);
sb_set_blocksize(sb, 4096);
fs_info->running_transaction = NULL;
fs_info->last_trans_committed = 0;
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->chunk_root = chunk_root;
@ -770,11 +768,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
INIT_LIST_HEAD(&fs_info->space_info);
btrfs_mapping_init(&fs_info->mapping_tree);
fs_info->sb = sb;
fs_info->throttles = 0;
fs_info->mount_opt = 0;
fs_info->max_extent = (u64)-1;
fs_info->max_inline = 8192 * 1024;
fs_info->delalloc_bytes = 0;
setup_bdi(fs_info, &fs_info->bdi);
fs_info->btree_inode = new_inode(sb);
fs_info->btree_inode->i_ino = 1;
@ -802,12 +797,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
extent_io_tree_init(&fs_info->extent_ins,
fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->do_barriers = 1;
fs_info->closing = 0;
fs_info->total_pinned = 0;
fs_info->last_alloc = 0;
fs_info->last_data_alloc = 0;
fs_info->extra_alloc_bits = 0;
fs_info->extra_data_alloc_bits = 0;
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
@ -923,6 +912,11 @@ struct btrfs_root *open_ctree(struct super_block *sb,
btrfs_read_block_groups(extent_root);
fs_info->generation = btrfs_super_generation(disk_super) + 1;
if (btrfs_super_num_devices(disk_super) > 0) {
fs_info->data_alloc_profile = BTRFS_BLOCK_GROUP_RAID0;
fs_info->metadata_alloc_profile = BTRFS_BLOCK_GROUP_RAID1;
fs_info->system_alloc_profile = BTRFS_BLOCK_GROUP_RAID0;
}
mutex_unlock(&fs_info->fs_mutex);
return tree_root;

95
fs/btrfs/extent-tree.c
View file

@ -230,9 +230,13 @@ static int noinline find_search_start(struct btrfs_root *root,
goto new_group;
if (start + num > total_fs_bytes)
goto new_group;
if (!block_group_bits(cache, data)) {
printk("block group bits don't match %Lu %Lu\n", cache->flags, data);
}
*start_ret = start;
return 0;
} out:
}
out:
cache = btrfs_lookup_block_group(root->fs_info, search_start);
if (!cache) {
printk("Unable to find block group for %Lu\n", search_start);
@ -365,14 +369,17 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
if (cache->key.objectid > total_fs_bytes)
break;
if (full_search)
free_check = cache->key.offset;
else
free_check = div_factor(cache->key.offset, factor);
if (block_group_bits(cache, data)) {
if (full_search)
free_check = cache->key.offset;
else
free_check = div_factor(cache->key.offset,
factor);
if (used + cache->pinned < free_check) {
found_group = cache;
goto found;
if (used + cache->pinned < free_check) {
found_group = cache;
goto found;
}
}
cond_resched();
}
@ -1038,6 +1045,19 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
return 0;
}
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);
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;
}
}
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
@ -1060,7 +1080,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
if (space_info->full)
return 0;
thresh = div_factor(space_info->total_bytes, 7);
thresh = div_factor(space_info->total_bytes, 6);
if ((space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) <
thresh)
return 0;
@ -1079,16 +1099,7 @@ printk("space info full %Lu\n", flags);
start, num_bytes);
BUG_ON(ret);
if (flags & BTRFS_BLOCK_GROUP_RAID0) {
if (flags & BTRFS_BLOCK_GROUP_DATA) {
extent_root->fs_info->extra_data_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
if (flags & BTRFS_BLOCK_GROUP_METADATA) {
extent_root->fs_info->extra_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
}
set_avail_alloc_bits(extent_root->fs_info, flags);
return 0;
}
@ -1529,6 +1540,7 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
if (data & BTRFS_BLOCK_GROUP_METADATA) {
last_ptr = &root->fs_info->last_alloc;
empty_cluster = 256 * 1024;
}
if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) {
@ -1693,6 +1705,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
u64 root_used;
u64 search_start = 0;
u64 new_hint;
u64 alloc_profile;
u32 sizes[2];
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
@ -1700,31 +1713,32 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_extent_ref *ref;
struct btrfs_path *path;
struct btrfs_key keys[2];
int extra_chunk_alloc_bits = 0;
if (data) {
data = BTRFS_BLOCK_GROUP_DATA | info->extra_data_alloc_bits;
alloc_profile = info->avail_data_alloc_bits &
info->data_alloc_profile;
data = BTRFS_BLOCK_GROUP_DATA | alloc_profile;
} else if (root == root->fs_info->chunk_root) {
data = BTRFS_BLOCK_GROUP_SYSTEM;
alloc_profile = info->avail_system_alloc_bits &
info->system_alloc_profile;
data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
} else {
data = BTRFS_BLOCK_GROUP_METADATA | info->extra_alloc_bits;
alloc_profile = info->avail_metadata_alloc_bits &
info->metadata_alloc_profile;
data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
}
if (btrfs_super_num_devices(&info->super_copy) > 1 &&
!(data & BTRFS_BLOCK_GROUP_SYSTEM))
extra_chunk_alloc_bits = BTRFS_BLOCK_GROUP_RAID0;
if (root->ref_cows) {
if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
2 * 1024 * 1024,
BTRFS_BLOCK_GROUP_METADATA |
info->extra_alloc_bits |
extra_chunk_alloc_bits);
(info->metadata_alloc_profile &
info->avail_metadata_alloc_bits));
BUG_ON(ret);
}
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
num_bytes + 2 * 1024 * 1024, data |
extra_chunk_alloc_bits);
num_bytes + 2 * 1024 * 1024, data);
BUG_ON(ret);
}
@ -2046,12 +2060,12 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
if (!next || !btrfs_buffer_uptodate(next)) {
free_extent_buffer(next);
reada_walk_down(root, cur, path->slots[*level]);
next = read_tree_block(root, bytenr, blocksize);
/* we used to drop the lock above, keep the
* code to double check so that we won't forget
* when we drop the lock again in the future
*/
mutex_unlock(&root->fs_info->fs_mutex);
next = read_tree_block(root, bytenr, blocksize);
mutex_lock(&root->fs_info->fs_mutex);
/* we've dropped the lock, double check */
ret = lookup_extent_ref(trans, root, bytenr,
blocksize, &refs);
BUG_ON(ret);
@ -2739,16 +2753,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
} else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
bit = BLOCK_GROUP_METADATA;
}
if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) {
if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
info->extra_data_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
info->extra_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
}
set_avail_alloc_bits(info, cache->flags);
ret = update_space_info(info, cache->flags, found_key.offset,
btrfs_block_group_used(&cache->item),

4
fs/btrfs/inode.c
View file

@ -306,6 +306,7 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
u64 physical;
u64 length = 0;
u64 map_length;
int total_devs;
struct bio_vec *bvec;
int i;
int ret;
@ -315,7 +316,8 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
}
map_tree = &root->fs_info->mapping_tree;
map_length = length;
ret = btrfs_map_block(map_tree, logical, &physical, &map_length, &dev);
ret = btrfs_map_block(map_tree, READ, 0, logical, &physical,
&map_length, &dev, &total_devs);
if (map_length < length + size) {
return 1;
}

152
fs/btrfs/volumes.c
View file

@ -31,6 +31,13 @@ struct stripe {
u64 physical;
};
struct multi_bio {
atomic_t stripes;
bio_end_io_t *end_io;
void *private;
int error;
};
struct map_lookup {
u64 type;
int io_align;
@ -632,12 +639,12 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
if (list_empty(dev_list))
return -ENOSPC;
if (type & BTRFS_BLOCK_GROUP_RAID0)
if (type & (BTRFS_BLOCK_GROUP_RAID0))
num_stripes = btrfs_super_num_devices(&info->super_copy);
if (type & BTRFS_BLOCK_GROUP_DATA)
stripe_len = 64 * 1024;
if (type & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
stripe_len = 32 * 1024;
if (type & (BTRFS_BLOCK_GROUP_RAID1)) {
num_stripes = min_t(u64, 2,
btrfs_super_num_devices(&info->super_copy));
}
again:
INIT_LIST_HEAD(&private_devs);
cur = dev_list->next;
@ -682,7 +689,11 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
stripes = &chunk->stripe;
*num_bytes = calc_size * num_stripes;
if (type & BTRFS_BLOCK_GROUP_RAID1)
*num_bytes = calc_size;
else
*num_bytes = calc_size * num_stripes;
index = 0;
while(index < num_stripes) {
BUG_ON(list_empty(&private_devs));
@ -694,7 +705,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
key.objectid,
calc_size, &dev_offset);
BUG_ON(ret);
printk("alloc chunk size %Lu from dev %Lu\n", calc_size, device->devid);
printk("alloc chunk start %Lu size %Lu from dev %Lu type %Lu\n", key.objectid, calc_size, device->devid, type);
device->bytes_used += calc_size;
ret = btrfs_update_device(trans, device);
BUG_ON(ret);
@ -774,9 +785,9 @@ void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
}
}
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev)
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
int dev_nr, u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev, int *total_devs)
{
struct extent_map *em;
struct map_lookup *map;
@ -808,19 +819,39 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
/* stripe_offset is the offset of this block in its stripe*/
stripe_offset = offset - stripe_offset;
/*
* after this do_div call, stripe_nr is the number of stripes
* on this device we have to walk to find the data, and
* stripe_index is the number of our device in the stripe array
*/
stripe_index = do_div(stripe_nr, map->num_stripes);
if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
stripe_index = dev_nr;
if (rw & (1 << BIO_RW))
*total_devs = map->num_stripes;
else {
int i;
u64 least = (u64)-1;
struct btrfs_device *cur;
for (i = 0; i < map->num_stripes; i++) {
cur = map->stripes[i].dev;
spin_lock(&cur->io_lock);
if (cur->total_ios < least) {
least = cur->total_ios;
stripe_index = i;
}
spin_unlock(&cur->io_lock);
}
*total_devs = 1;
}
} else {
/*
* after this do_div call, stripe_nr is the number of stripes
* on this device we have to walk to find the data, and
* stripe_index is the number of our device in the stripe array
*/
stripe_index = do_div(stripe_nr, map->num_stripes);
}
BUG_ON(stripe_index >= map->num_stripes);
*phys = map->stripes[stripe_index].physical + stripe_offset +
stripe_nr * map->stripe_len;
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1)) {
/* 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);
@ -833,33 +864,98 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
return 0;
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
static void end_bio_multi_stripe(struct bio *bio, int err)
#else
static int end_bio_multi_stripe(struct bio *bio,
unsigned int bytes_done, int err)
#endif
{
struct multi_bio *multi = bio->bi_private;
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
if (bio->bi_size)
return 1;
#endif
if (err)
multi->error = err;
if (atomic_dec_and_test(&multi->stripes)) {
bio->bi_private = multi->private;
bio->bi_end_io = multi->end_io;
if (!err && multi->error)
err = multi->error;
kfree(multi);
bio_endio(bio, err);
} else {
bio_put(bio);
}
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
return 0;
#endif
}
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio)
{
struct btrfs_mapping_tree *map_tree;
struct btrfs_device *dev;
struct bio *first_bio = bio;
u64 logical = bio->bi_sector << 9;
u64 physical;
u64 length = 0;
u64 map_length;
struct bio_vec *bvec;
struct multi_bio *multi = NULL;
int i;
int ret;
int dev_nr = 0;
int total_devs = 1;
bio_for_each_segment(bvec, bio, i) {
length += bvec->bv_len;
}
map_tree = &root->fs_info->mapping_tree;
map_length = length;
ret = btrfs_map_block(map_tree, logical, &physical, &map_length, &dev);
if (map_length < length) {
printk("mapping failed logical %Lu bio len %Lu physical %Lu "
"len %Lu\n", logical, length, physical, map_length);
BUG();
while(dev_nr < total_devs) {
ret = btrfs_map_block(map_tree, rw, dev_nr, logical,
&physical, &map_length, &dev,
&total_devs);
if (map_length < length) {
printk("mapping failed logical %Lu bio len %Lu physical %Lu "
"len %Lu\n", logical, length, physical, map_length);
BUG();
}
BUG_ON(map_length < length);
if (total_devs > 1) {
if (!multi) {
multi = kmalloc(sizeof(*multi), GFP_NOFS);
atomic_set(&multi->stripes, 1);
multi->end_io = bio->bi_end_io;
multi->private = first_bio->bi_private;
multi->error = 0;
} else {
atomic_inc(&multi->stripes);
}
if (dev_nr < total_devs - 1) {
bio = bio_clone(first_bio, GFP_NOFS);
BUG_ON(!bio);
} else {
bio = first_bio;
}
bio->bi_private = multi;
bio->bi_end_io = end_bio_multi_stripe;
}
bio->bi_sector = physical >> 9;
bio->bi_bdev = dev->bdev;
spin_lock(&dev->io_lock);
dev->total_ios++;
spin_unlock(&dev->io_lock);
submit_bio(rw, bio);
dev_nr++;
}
BUG_ON(map_length < length);
bio->bi_sector = physical >> 9;
bio->bi_bdev = dev->bdev;
submit_bio(rw, bio);
return 0;
}
@ -982,6 +1078,8 @@ static int read_one_dev(struct btrfs_root *root,
return -ENOMEM;
list_add(&device->dev_list,
&root->fs_info->fs_devices->devices);
device->total_ios = 0;
spin_lock_init(&device->io_lock);
}
fill_device_from_item(leaf, dev_item, device);

11
fs/btrfs/volumes.h
View file

@ -18,12 +18,16 @@
#ifndef __BTRFS_VOLUMES_
#define __BTRFS_VOLUMES_
struct btrfs_device {
struct list_head dev_list;
struct btrfs_root *dev_root;
spinlock_t io_lock;
struct block_device *bdev;
u64 total_ios;
char *name;
/* the internal btrfs device id */
@ -68,9 +72,9 @@ struct btrfs_fs_devices {
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 owner, u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, int stripe_nr,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev);
struct btrfs_device **dev, int *total_stripes);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
@ -80,9 +84,6 @@ void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
int flags, void *holder);
int btrfs_scan_one_device(const char *path, int flags, void *holder,