@@ -4818,6 +4818,29 @@ static void check_raid1c34_incompat_flag(struct btrfs_fs_info *info, u64 type)
btrfs_set_fs_incompat(info, RAID1C34);
}
+/*
+ * Structure used internally for __btrfs_alloc_chunk() function.
+ * Wraps needed parameters.
+ */
+struct alloc_chunk_ctl {
+ u64 start;
+ u64 type;
+ int num_stripes; /* total number of stripes to allocate */
+ int sub_stripes; /* sub_stripes info for map */
+ int dev_stripes; /* stripes per dev */
+ int devs_max; /* max devs to use */
+ int devs_min; /* min devs needed */
+ int devs_increment; /* ndevs has to be a multiple of this */
+ int ncopies; /* how many copies to data has */
+ int nparity; /* number of stripes worth of bytes to
+ store parity information */
+ u64 max_stripe_size;
+ u64 max_chunk_size;
+ u64 stripe_size;
+ u64 chunk_size;
+ int ndevs;
+};
+
static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
u64 start, u64 type)
{
@@ -4828,23 +4851,11 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct extent_map_tree *em_tree;
struct extent_map *em;
struct btrfs_device_info *devices_info = NULL;
+ struct alloc_chunk_ctl ctl;
u64 total_avail;
- int num_stripes; /* total number of stripes to allocate */
int data_stripes; /* number of stripes that count for
block group size */
- int sub_stripes; /* sub_stripes info for map */
- int dev_stripes; /* stripes per dev */
- int devs_max; /* max devs to use */
- int devs_min; /* min devs needed */
- int devs_increment; /* ndevs has to be a multiple of this */
- int ncopies; /* how many copies to data has */
- int nparity; /* number of stripes worth of bytes to
- store parity information */
int ret;
- u64 max_stripe_size;
- u64 max_chunk_size;
- u64 stripe_size;
- u64 chunk_size;
int ndevs;
int i;
int j;
@@ -4861,32 +4872,36 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
return -ENOSPC;
}
+ ctl.start = start;
+ ctl.type = type;
+
index = btrfs_bg_flags_to_raid_index(type);
- sub_stripes = btrfs_raid_array[index].sub_stripes;
- dev_stripes = btrfs_raid_array[index].dev_stripes;
- devs_max = btrfs_raid_array[index].devs_max;
- if (!devs_max)
- devs_max = BTRFS_MAX_DEVS(info);
- devs_min = btrfs_raid_array[index].devs_min;
- devs_increment = btrfs_raid_array[index].devs_increment;
- ncopies = btrfs_raid_array[index].ncopies;
- nparity = btrfs_raid_array[index].nparity;
+ ctl.sub_stripes = btrfs_raid_array[index].sub_stripes;
+ ctl.dev_stripes = btrfs_raid_array[index].dev_stripes;
+ ctl.devs_max = btrfs_raid_array[index].devs_max;
+ if (!ctl.devs_max)
+ ctl.devs_max = BTRFS_MAX_DEVS(info);
+ ctl.devs_min = btrfs_raid_array[index].devs_min;
+ ctl.devs_increment = btrfs_raid_array[index].devs_increment;
+ ctl.ncopies = btrfs_raid_array[index].ncopies;
+ ctl.nparity = btrfs_raid_array[index].nparity;
if (type & BTRFS_BLOCK_GROUP_DATA) {
- max_stripe_size = SZ_1G;
- max_chunk_size = BTRFS_MAX_DATA_CHUNK_SIZE;
+ ctl.max_stripe_size = SZ_1G;
+ ctl.max_chunk_size = BTRFS_MAX_DATA_CHUNK_SIZE;
} else if (type & BTRFS_BLOCK_GROUP_METADATA) {
/* for larger filesystems, use larger metadata chunks */
if (fs_devices->total_rw_bytes > 50ULL * SZ_1G)
- max_stripe_size = SZ_1G;
+ ctl.max_stripe_size = SZ_1G;
else
- max_stripe_size = SZ_256M;
- max_chunk_size = max_stripe_size;
+ ctl.max_stripe_size = SZ_256M;
+ ctl.max_chunk_size = ctl.max_stripe_size;
} else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
- max_stripe_size = SZ_32M;
- max_chunk_size = 2 * max_stripe_size;
- devs_max = min_t(int, devs_max, BTRFS_MAX_DEVS_SYS_CHUNK);
+ ctl.max_stripe_size = SZ_32M;
+ ctl.max_chunk_size = 2 * ctl.max_stripe_size;
+ ctl.devs_max = min_t(int, ctl.devs_max,
+ BTRFS_MAX_DEVS_SYS_CHUNK);
} else {
btrfs_err(info, "invalid chunk type 0x%llx requested",
type);
@@ -4894,8 +4909,8 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
}
/* We don't want a chunk larger than 10% of writable space */
- max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1),
- max_chunk_size);
+ ctl.max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1),
+ ctl.max_chunk_size);
devices_info = kcalloc(fs_devices->rw_devices, sizeof(*devices_info),
GFP_NOFS);
@@ -4931,21 +4946,21 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
if (total_avail == 0)
continue;
- ret = find_free_dev_extent(device,
- max_stripe_size * dev_stripes,
- &dev_offset, &max_avail);
+ ret = find_free_dev_extent(
+ device, ctl.max_stripe_size * ctl.dev_stripes,
+ &dev_offset, &max_avail);
if (ret && ret != -ENOSPC)
goto error;
if (ret == 0)
- max_avail = max_stripe_size * dev_stripes;
+ max_avail = ctl.max_stripe_size * ctl.dev_stripes;
- if (max_avail < BTRFS_STRIPE_LEN * dev_stripes) {
+ if (max_avail < BTRFS_STRIPE_LEN * ctl.dev_stripes) {
if (btrfs_test_opt(info, ENOSPC_DEBUG))
btrfs_debug(info,
"%s: devid %llu has no free space, have=%llu want=%u",
__func__, device->devid, max_avail,
- BTRFS_STRIPE_LEN * dev_stripes);
+ BTRFS_STRIPE_LEN * ctl.dev_stripes);
continue;
}
@@ -4960,30 +4975,31 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
devices_info[ndevs].dev = device;
++ndevs;
}
+ ctl.ndevs = ndevs;
/*
* now sort the devices by hole size / available space
*/
- sort(devices_info, ndevs, sizeof(struct btrfs_device_info),
+ sort(devices_info, ctl.ndevs, sizeof(struct btrfs_device_info),
btrfs_cmp_device_info, NULL);
/*
* Round down to number of usable stripes, devs_increment can be any
* number so we can't use round_down()
*/
- ndevs -= ndevs % devs_increment;
+ ctl.ndevs -= ctl.ndevs % ctl.devs_increment;
- if (ndevs < devs_min) {
+ if (ctl.ndevs < ctl.devs_min) {
ret = -ENOSPC;
if (btrfs_test_opt(info, ENOSPC_DEBUG)) {
btrfs_debug(info,
"%s: not enough devices with free space: have=%d minimum required=%d",
- __func__, ndevs, devs_min);
+ __func__, ctl.ndevs, ctl.devs_min);
}
goto error;
}
- ndevs = min(ndevs, devs_max);
+ ctl.ndevs = min(ctl.ndevs, ctl.devs_max);
/*
* The primary goal is to maximize the number of stripes, so use as
@@ -4992,14 +5008,15 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
* The DUP profile stores more than one stripe per device, the
* max_avail is the total size so we have to adjust.
*/
- stripe_size = div_u64(devices_info[ndevs - 1].max_avail, dev_stripes);
- num_stripes = ndevs * dev_stripes;
+ ctl.stripe_size = div_u64(devices_info[ctl.ndevs - 1].max_avail,
+ ctl.dev_stripes);
+ ctl.num_stripes = ctl.ndevs * ctl.dev_stripes;
/*
* this will have to be fixed for RAID1 and RAID10 over
* more drives
*/
- data_stripes = (num_stripes - nparity) / ncopies;
+ data_stripes = (ctl.num_stripes - ctl.nparity) / ctl.ncopies;
/*
* Use the number of data stripes to figure out how big this chunk
@@ -5007,44 +5024,46 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
* and compare that answer with the max chunk size. If it's higher,
* we try to reduce stripe_size.
*/
- if (stripe_size * data_stripes > max_chunk_size) {
+ if (ctl.stripe_size * data_stripes > ctl.max_chunk_size) {
/*
* Reduce stripe_size, round it up to a 16MB boundary again and
* then use it, unless it ends up being even bigger than the
* previous value we had already.
*/
- stripe_size = min(round_up(div_u64(max_chunk_size,
- data_stripes), SZ_16M),
- stripe_size);
+ ctl.stripe_size =
+ min(round_up(div_u64(ctl.max_chunk_size, data_stripes),
+ SZ_16M),
+ ctl.stripe_size);
}
/* align to BTRFS_STRIPE_LEN */
- stripe_size = round_down(stripe_size, BTRFS_STRIPE_LEN);
+ ctl.stripe_size = round_down(ctl.stripe_size, BTRFS_STRIPE_LEN);
- map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
+ map = kmalloc(map_lookup_size(ctl.num_stripes), GFP_NOFS);
if (!map) {
ret = -ENOMEM;
goto error;
}
- map->num_stripes = num_stripes;
- for (i = 0; i < ndevs; ++i) {
- for (j = 0; j < dev_stripes; ++j) {
- int s = i * dev_stripes + j;
+ map->num_stripes = ctl.num_stripes;
+
+ for (i = 0; i < ctl.ndevs; ++i) {
+ for (j = 0; j < ctl.dev_stripes; ++j) {
+ int s = i * ctl.dev_stripes + j;
map->stripes[s].dev = devices_info[i].dev;
map->stripes[s].physical = devices_info[i].dev_offset +
- j * stripe_size;
+ j * ctl.stripe_size;
}
}
map->stripe_len = BTRFS_STRIPE_LEN;
map->io_align = BTRFS_STRIPE_LEN;
map->io_width = BTRFS_STRIPE_LEN;
map->type = type;
- map->sub_stripes = sub_stripes;
+ map->sub_stripes = ctl.sub_stripes;
- chunk_size = stripe_size * data_stripes;
+ ctl.chunk_size = ctl.stripe_size * data_stripes;
- trace_btrfs_chunk_alloc(info, map, start, chunk_size);
+ trace_btrfs_chunk_alloc(info, map, start, ctl.chunk_size);
em = alloc_extent_map();
if (!em) {
@@ -5055,10 +5074,10 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
em->map_lookup = map;
em->start = start;
- em->len = chunk_size;
+ em->len = ctl.chunk_size;
em->block_start = 0;
em->block_len = em->len;
- em->orig_block_len = stripe_size;
+ em->orig_block_len = ctl.stripe_size;
em_tree = &info->mapping_tree;
write_lock(&em_tree->lock);
@@ -5070,20 +5089,22 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
}
write_unlock(&em_tree->lock);
- ret = btrfs_make_block_group(trans, 0, type, start, chunk_size);
+ ret = btrfs_make_block_group(trans, 0, type, start, ctl.chunk_size);
if (ret)
goto error_del_extent;
for (i = 0; i < map->num_stripes; i++) {
struct btrfs_device *dev = map->stripes[i].dev;
- btrfs_device_set_bytes_used(dev, dev->bytes_used + stripe_size);
+ btrfs_device_set_bytes_used(dev,
+ dev->bytes_used + ctl.stripe_size);
if (list_empty(&dev->post_commit_list))
list_add_tail(&dev->post_commit_list,
&trans->transaction->dev_update_list);
}
- atomic64_sub(stripe_size * map->num_stripes, &info->free_chunk_space);
+ atomic64_sub(ctl.stripe_size * map->num_stripes,
+ &info->free_chunk_space);
free_extent_map(em);
check_raid56_incompat_flag(info, type);
Introduce "struct alloc_chunk_ctl" to wrap needed parameters for the chunk allocation. This will be used to split __btrfs_alloc_chunk() into smaller functions. This commit folds a number of local variables in __btrfs_alloc_chunk() into one "struct alloc_chunk_ctl ctl". There is no functional change. Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> --- fs/btrfs/volumes.c | 151 ++++++++++++++++++++++++++------------------- 1 file changed, 86 insertions(+), 65 deletions(-)