diff options
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 354dc1a894c2..36de58a37653 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -357,7 +357,7 @@ static struct kmem_cache *ext4_free_data_cachep; #define NR_GRPINFO_CACHES 8 static struct kmem_cache *ext4_groupinfo_caches[NR_GRPINFO_CACHES]; -static const char *ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = { +static const char * const ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = { "ext4_groupinfo_1k", "ext4_groupinfo_2k", "ext4_groupinfo_4k", "ext4_groupinfo_8k", "ext4_groupinfo_16k", "ext4_groupinfo_32k", "ext4_groupinfo_64k", "ext4_groupinfo_128k" @@ -5277,3 +5277,52 @@ out: range->len = EXT4_C2B(EXT4_SB(sb), trimmed) << sb->s_blocksize_bits; return ret; } + +/* Iterate all the free extents in the group. */ +int +ext4_mballoc_query_range( + struct super_block *sb, + ext4_group_t group, + ext4_grpblk_t start, + ext4_grpblk_t end, + ext4_mballoc_query_range_fn formatter, + void *priv) +{ + void *bitmap; + ext4_grpblk_t next; + struct ext4_buddy e4b; + int error; + + error = ext4_mb_load_buddy(sb, group, &e4b); + if (error) + return error; + bitmap = e4b.bd_bitmap; + + ext4_lock_group(sb, group); + + start = (e4b.bd_info->bb_first_free > start) ? + e4b.bd_info->bb_first_free : start; + if (end >= EXT4_CLUSTERS_PER_GROUP(sb)) + end = EXT4_CLUSTERS_PER_GROUP(sb) - 1; + + while (start <= end) { + start = mb_find_next_zero_bit(bitmap, end + 1, start); + if (start > end) + break; + next = mb_find_next_bit(bitmap, end + 1, start); + + ext4_unlock_group(sb, group); + error = formatter(sb, group, start, next - start, priv); + if (error) + goto out_unload; + ext4_lock_group(sb, group); + + start = next + 1; + } + + ext4_unlock_group(sb, group); +out_unload: + ext4_mb_unload_buddy(&e4b); + + return error; +} |