/*
* find_free_dev_extent - find free space in the specified device
- * @trans: transaction handler
* @device: the device which we search the free space in
* @num_bytes: the size of the free space that we need
* @start: store the start of the free space.
* But if we don't find suitable free space, it is used to store the size of
* the max free space.
*/
-int find_free_dev_extent(struct btrfs_trans_handle *trans,
- struct btrfs_device *device, u64 num_bytes,
+int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
u64 *start, u64 *len)
{
struct btrfs_key key;
key.offset = search_start;
key.type = BTRFS_DEV_EXTENT_KEY;
- ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
if (ret > 0) {
/*
* does all the dirty work required for changing file system's UUID.
*/
-static int btrfs_prepare_sprout(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+static int btrfs_prepare_sprout(struct btrfs_root *root)
{
struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
struct btrfs_fs_devices *old_devices;
if (seeding_dev) {
sb->s_flags &= ~MS_RDONLY;
- ret = btrfs_prepare_sprout(trans, root);
+ ret = btrfs_prepare_sprout(root);
BUG_ON(ret);
}
return ret;
}
-static int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
- struct btrfs_root *root,
+static int btrfs_add_system_chunk(struct btrfs_root *root,
struct btrfs_key *key,
struct btrfs_chunk *chunk, int item_size)
{
if (total_avail == 0)
continue;
- ret = find_free_dev_extent(trans, device,
+ ret = find_free_dev_extent(device,
max_stripe_size * dev_stripes,
&dev_offset, &max_avail);
if (ret && ret != -ENOSPC)
BUG_ON(ret);
if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
- ret = btrfs_add_system_chunk(trans, chunk_root, &key, chunk,
+ ret = btrfs_add_system_chunk(chunk_root, &key, chunk,
item_size);
BUG_ON(ret);
}
u64 stripe_nr;
u64 stripe_nr_orig;
u64 stripe_nr_end;
- int stripes_allocated = 8;
- int stripes_required = 1;
int stripe_index;
int i;
+ int ret = 0;
int num_stripes;
int max_errors = 0;
struct btrfs_bio *bbio = NULL;
- if (bbio_ret && !(rw & (REQ_WRITE | REQ_DISCARD)))
- stripes_allocated = 1;
-again:
- if (bbio_ret) {
- bbio = kzalloc(btrfs_bio_size(stripes_allocated),
- GFP_NOFS);
- if (!bbio)
- return -ENOMEM;
-
- atomic_set(&bbio->error, 0);
- }
-
read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, *length);
read_unlock(&em_tree->lock);
if (mirror_num > map->num_stripes)
mirror_num = 0;
- /* if our btrfs_bio struct is too small, back off and try again */
- if (rw & REQ_WRITE) {
- if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
- BTRFS_BLOCK_GROUP_DUP)) {
- stripes_required = map->num_stripes;
- max_errors = 1;
- } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
- stripes_required = map->sub_stripes;
- max_errors = 1;
- }
- }
- if (rw & REQ_DISCARD) {
- 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) {
- stripes_allocated = map->num_stripes;
- free_extent_map(em);
- kfree(bbio);
- goto again;
- }
stripe_nr = offset;
/*
* stripe_nr counts the total number of stripes we have to stride
}
BUG_ON(stripe_index >= map->num_stripes);
+ bbio = kzalloc(btrfs_bio_size(num_stripes), GFP_NOFS);
+ if (!bbio) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ atomic_set(&bbio->error, 0);
+
if (rw & REQ_DISCARD) {
+ int factor = 0;
+ int sub_stripes = 0;
+ u64 stripes_per_dev = 0;
+ u32 remaining_stripes = 0;
+
+ if (map->type &
+ (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) {
+ if (map->type & BTRFS_BLOCK_GROUP_RAID0)
+ sub_stripes = 1;
+ else
+ sub_stripes = map->sub_stripes;
+
+ factor = map->num_stripes / sub_stripes;
+ stripes_per_dev = div_u64_rem(stripe_nr_end -
+ stripe_nr_orig,
+ factor,
+ &remaining_stripes);
+ }
+
for (i = 0; i < num_stripes; i++) {
bbio->stripes[i].physical =
map->stripes[stripe_index].physical +
stripe_offset + stripe_nr * map->stripe_len;
bbio->stripes[i].dev = map->stripes[stripe_index].dev;
- if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
- u64 stripes;
- u32 last_stripe = 0;
- int j;
-
- div_u64_rem(stripe_nr_end - 1,
- map->num_stripes,
- &last_stripe);
-
- for (j = 0; j < map->num_stripes; j++) {
- u32 test;
-
- div_u64_rem(stripe_nr_end - 1 - j,
- map->num_stripes, &test);
- if (test == stripe_index)
- break;
- }
- stripes = stripe_nr_end - 1 - j;
- do_div(stripes, map->num_stripes);
- bbio->stripes[i].length = map->stripe_len *
- (stripes - stripe_nr + 1);
-
- if (i == 0) {
- bbio->stripes[i].length -=
- stripe_offset;
- stripe_offset = 0;
- }
- if (stripe_index == last_stripe)
- bbio->stripes[i].length -=
- stripe_end_offset;
- } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
- u64 stripes;
- int j;
- int factor = map->num_stripes /
- map->sub_stripes;
- u32 last_stripe = 0;
-
- div_u64_rem(stripe_nr_end - 1,
- factor, &last_stripe);
- last_stripe *= map->sub_stripes;
-
- for (j = 0; j < factor; j++) {
- u32 test;
-
- div_u64_rem(stripe_nr_end - 1 - j,
- factor, &test);
-
- if (test ==
- stripe_index / map->sub_stripes)
- break;
- }
- stripes = stripe_nr_end - 1 - j;
- do_div(stripes, factor);
- bbio->stripes[i].length = map->stripe_len *
- (stripes - stripe_nr + 1);
-
- if (i < map->sub_stripes) {
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
+ BTRFS_BLOCK_GROUP_RAID10)) {
+ bbio->stripes[i].length = stripes_per_dev *
+ map->stripe_len;
+ if (i / sub_stripes < remaining_stripes)
+ bbio->stripes[i].length +=
+ map->stripe_len;
+ if (i < sub_stripes)
bbio->stripes[i].length -=
stripe_offset;
- if (i == map->sub_stripes - 1)
- stripe_offset = 0;
- }
- if (stripe_index >= last_stripe &&
- stripe_index <= (last_stripe +
- map->sub_stripes - 1)) {
+ if ((i / sub_stripes + 1) %
+ sub_stripes == remaining_stripes)
bbio->stripes[i].length -=
stripe_end_offset;
- }
+ if (i == sub_stripes - 1)
+ stripe_offset = 0;
} else
bbio->stripes[i].length = *length;
stripe_index++;
}
}
- if (bbio_ret) {
- *bbio_ret = bbio;
- bbio->num_stripes = num_stripes;
- bbio->max_errors = max_errors;
- bbio->mirror_num = mirror_num;
+
+ if (rw & REQ_WRITE) {
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10 |
+ BTRFS_BLOCK_GROUP_DUP)) {
+ max_errors = 1;
+ }
}
+
+ *bbio_ret = bbio;
+ bbio->num_stripes = num_stripes;
+ bbio->max_errors = max_errors;
+ bbio->mirror_num = mirror_num;
out:
free_extent_map(em);
- return 0;
+ return ret;
}
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
struct btrfs_fs_devices *fs_devices;
int ret;
- mutex_lock(&uuid_mutex);
+ BUG_ON(!mutex_is_locked(&uuid_mutex));
fs_devices = root->fs_info->fs_devices->seed;
while (fs_devices) {
fs_devices->seed = root->fs_info->fs_devices->seed;
root->fs_info->fs_devices->seed = fs_devices;
out:
- mutex_unlock(&uuid_mutex);
return ret;
}
if (!path)
return -ENOMEM;
+ mutex_lock(&uuid_mutex);
+ lock_chunks(root);
+
/* first we search for all of the device items, and then we
* read in all of the chunk items. This way we can create chunk
* mappings that reference all of the devices that are afound
}
ret = 0;
error:
+ unlock_chunks(root);
+ mutex_unlock(&uuid_mutex);
+
btrfs_free_path(path);
return ret;
}
projects / ~andy / linux / blobdiff