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btrfs: cleanup, stop casting for extent_map->lookup everywhere

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Overloading extent_map->bdev to struct map_lookup * might have started out
as a means to an end, but it's a pattern that's used all over the place
now. Let's get rid of the casting and just add a union instead.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney 2015-06-03 10:55:48 -04:00 committed by David Sterba
parent a7ca42256d
commit 95617d6932
6 changed files with 25 additions and 17 deletions
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2
fs/btrfs/dev-replace.c
View File

@ -614,7 +614,7 @@ static void btrfs_dev_replace_update_device_in_mapping_tree(
em = lookup_extent_mapping(em_tree, start, (u64)-1);
if (!em)
break;
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
for (i = 0; i < map->num_stripes; i++)
if (srcdev == map->stripes[i].dev)
map->stripes[i].dev = tgtdev;

2
fs/btrfs/extent-tree.c
View File

@ -10322,7 +10322,7 @@ btrfs_start_trans_remove_block_group(struct btrfs_fs_info *fs_info,
* more device items and remove one chunk item), but this is done at
* btrfs_remove_chunk() through a call to check_system_chunk().
*/
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
num_items = 3 + map->num_stripes;
free_extent_map(em);

2
fs/btrfs/extent_map.c
View File

@ -76,7 +76,7 @@ void free_extent_map(struct extent_map *em)
WARN_ON(extent_map_in_tree(em));
WARN_ON(!list_empty(&em->list));
if (test_bit(EXTENT_FLAG_FS_MAPPING, &em->flags))
kfree(em->bdev);
kfree(em->map_lookup);
kmem_cache_free(extent_map_cache, em);
}
}

10
fs/btrfs/extent_map.h
View File

@ -32,7 +32,15 @@ struct extent_map {
u64 block_len;
u64 generation;
unsigned long flags;
struct block_device *bdev;
union {
struct block_device *bdev;
/*
* used for chunk mappings
* flags & EXTENT_FLAG_FS_MAPPING must be set
*/
struct map_lookup *map_lookup;
};
atomic_t refs;
unsigned int compress_type;
struct list_head list;

2
fs/btrfs/scrub.c
View File

@ -3458,7 +3458,7 @@ static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
return ret;
}
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
if (em->start != chunk_offset)
goto out;

24
fs/btrfs/volumes.c
View File

@ -1182,7 +1182,7 @@ again:
struct map_lookup *map;
int i;
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
for (i = 0; i < map->num_stripes; i++) {
u64 end;
@ -2754,7 +2754,7 @@ int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
free_extent_map(em);
return -EINVAL;
}
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
lock_chunks(root->fs_info->chunk_root);
check_system_chunk(trans, extent_root, map->type);
unlock_chunks(root->fs_info->chunk_root);
@ -4718,7 +4718,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
goto error;
}
set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
em->bdev = (struct block_device *)map;
em->map_lookup = map;
em->start = start;
em->len = num_bytes;
em->block_start = 0;
@ -4813,7 +4813,7 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
return -EINVAL;
}
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
item_size = btrfs_chunk_item_size(map->num_stripes);
stripe_size = em->orig_block_len;
@ -4955,7 +4955,7 @@ int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
if (!em)
return 1;
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
for (i = 0; i < map->num_stripes; i++) {
if (map->stripes[i].dev->missing) {
miss_ndevs++;
@ -5035,7 +5035,7 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
return 1;
}
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
ret = map->num_stripes;
else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
@ -5071,7 +5071,7 @@ unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
BUG_ON(!em);
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
len = map->stripe_len * nr_data_stripes(map);
free_extent_map(em);
@ -5092,7 +5092,7 @@ int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
BUG_ON(!em);
BUG_ON(em->start > logical || em->start + em->len < logical);
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
ret = 1;
free_extent_map(em);
@ -5251,7 +5251,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
return -EINVAL;
}
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
offset = logical - em->start;
stripe_len = map->stripe_len;
@ -5793,7 +5793,7 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
free_extent_map(em);
return -EIO;
}
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
length = em->len;
rmap_len = map->stripe_len;
@ -6229,7 +6229,7 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
}
set_bit(EXTENT_FLAG_FS_MAPPING, &em->flags);
em->bdev = (struct block_device *)map;
em->map_lookup = map;
em->start = logical;
em->len = length;
em->orig_start = 0;
@ -6920,7 +6920,7 @@ void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
/* In order to kick the device replace finish process */
lock_chunks(root);
list_for_each_entry(em, &transaction->pending_chunks, list) {
map = (struct map_lookup *)em->bdev;
map = em->map_lookup;
for (i = 0; i < map->num_stripes; i++) {
dev = map->stripes[i].dev;