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-rw-r--r--fs/ext4/ext4.h1
-rw-r--r--fs/ext4/mballoc.c98
2 files changed, 78 insertions, 21 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 889ec9d..b364b9d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -205,6 +205,7 @@ typedef struct ext4_io_end {
#define EXT4_MIN_BLOCK_SIZE 1024
#define EXT4_MAX_BLOCK_SIZE 65536
#define EXT4_MIN_BLOCK_LOG_SIZE 10
+#define EXT4_MAX_BLOCK_LOG_SIZE 16
#ifdef __KERNEL__
# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
#else
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 4b4ad4b..d4714d6 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -338,6 +338,14 @@
static struct kmem_cache *ext4_pspace_cachep;
static struct kmem_cache *ext4_ac_cachep;
static struct kmem_cache *ext4_free_ext_cachep;
+
+/* We create slab caches for groupinfo data structures based on the
+ * superblock block size. There will be one per mounted filesystem for
+ * each unique s_blocksize_bits */
+#define NR_GRPINFO_CACHES \
+ (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE + 1)
+static struct kmem_cache *ext4_groupinfo_caches[NR_GRPINFO_CACHES];
+
static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap,
ext4_group_t group);
static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap,
@@ -2233,15 +2241,24 @@ static const struct file_operations ext4_mb_seq_groups_fops = {
.release = seq_release,
};
+static struct kmem_cache *get_groupinfo_cache(int blocksize_bits)
+{
+ int cache_index = blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE;
+ struct kmem_cache *cachep = ext4_groupinfo_caches[cache_index];
+
+ BUG_ON(!cachep);
+ return cachep;
+}
/* Create and initialize ext4_group_info data for the given group. */
int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
struct ext4_group_desc *desc)
{
- int i, len;
+ int i;
int metalen = 0;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_info **meta_group_info;
+ struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits);
/*
* First check if this group is the first of a reserved block.
@@ -2261,22 +2278,16 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
meta_group_info;
}
- /*
- * calculate needed size. if change bb_counters size,
- * don't forget about ext4_mb_generate_buddy()
- */
- len = offsetof(typeof(**meta_group_info),
- bb_counters[sb->s_blocksize_bits + 2]);
-
meta_group_info =
sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)];
i = group & (EXT4_DESC_PER_BLOCK(sb) - 1);
- meta_group_info[i] = kzalloc(len, GFP_KERNEL);
+ meta_group_info[i] = kmem_cache_alloc(cachep, GFP_KERNEL);
if (meta_group_info[i] == NULL) {
printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n");
goto exit_group_info;
}
+ memset(meta_group_info[i], 0, kmem_cache_size(cachep));
set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT,
&(meta_group_info[i]->bb_state));
@@ -2331,6 +2342,7 @@ static int ext4_mb_init_backend(struct super_block *sb)
int num_meta_group_infos_max;
int array_size;
struct ext4_group_desc *desc;
+ struct kmem_cache *cachep;
/* This is the number of blocks used by GDT */
num_meta_group_infos = (ngroups + EXT4_DESC_PER_BLOCK(sb) -
@@ -2388,8 +2400,9 @@ static int ext4_mb_init_backend(struct super_block *sb)
return 0;
err_freebuddy:
+ cachep = get_groupinfo_cache(sb->s_blocksize_bits);
while (i-- > 0)
- kfree(ext4_get_group_info(sb, i));
+ kmem_cache_free(cachep, ext4_get_group_info(sb, i));
i = num_meta_group_infos;
while (i-- > 0)
kfree(sbi->s_group_info[i]);
@@ -2406,19 +2419,48 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
unsigned offset;
unsigned max;
int ret;
+ int cache_index;
+ struct kmem_cache *cachep;
+ char *namep = NULL;
i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_offsets);
sbi->s_mb_offsets = kmalloc(i, GFP_KERNEL);
if (sbi->s_mb_offsets == NULL) {
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out;
}
i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_maxs);
sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL);
if (sbi->s_mb_maxs == NULL) {
- kfree(sbi->s_mb_offsets);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ cache_index = sb->s_blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE;
+ cachep = ext4_groupinfo_caches[cache_index];
+ if (!cachep) {
+ char name[32];
+ int len = offsetof(struct ext4_group_info,
+ bb_counters[sb->s_blocksize_bits + 2]);
+
+ sprintf(name, "ext4_groupinfo_%d", sb->s_blocksize_bits);
+ namep = kstrdup(name, GFP_KERNEL);
+ if (!namep) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* Need to free the kmem_cache_name() when we
+ * destroy the slab */
+ cachep = kmem_cache_create(namep, len, 0,
+ SLAB_RECLAIM_ACCOUNT, NULL);
+ if (!cachep) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ext4_groupinfo_caches[cache_index] = cachep;
}
/* order 0 is regular bitmap */
@@ -2439,9 +2481,7 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
/* init file for buddy data */
ret = ext4_mb_init_backend(sb);
if (ret != 0) {
- kfree(sbi->s_mb_offsets);
- kfree(sbi->s_mb_maxs);
- return ret;
+ goto out;
}
spin_lock_init(&sbi->s_md_lock);
@@ -2456,9 +2496,8 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
sbi->s_locality_groups = alloc_percpu(struct ext4_locality_group);
if (sbi->s_locality_groups == NULL) {
- kfree(sbi->s_mb_offsets);
- kfree(sbi->s_mb_maxs);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out;
}
for_each_possible_cpu(i) {
struct ext4_locality_group *lg;
@@ -2475,7 +2514,13 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
if (sbi->s_journal)
sbi->s_journal->j_commit_callback = release_blocks_on_commit;
- return 0;
+out:
+ if (ret) {
+ kfree(sbi->s_mb_offsets);
+ kfree(sbi->s_mb_maxs);
+ kfree(namep);
+ }
+ return ret;
}
/* need to called with the ext4 group lock held */
@@ -2503,6 +2548,7 @@ int ext4_mb_release(struct super_block *sb)
int num_meta_group_infos;
struct ext4_group_info *grinfo;
struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits);
if (sbi->s_group_info) {
for (i = 0; i < ngroups; i++) {
@@ -2513,7 +2559,7 @@ int ext4_mb_release(struct super_block *sb)
ext4_lock_group(sb, i);
ext4_mb_cleanup_pa(grinfo);
ext4_unlock_group(sb, i);
- kfree(grinfo);
+ kmem_cache_free(cachep, grinfo);
}
num_meta_group_infos = (ngroups +
EXT4_DESC_PER_BLOCK(sb) - 1) >>
@@ -2691,6 +2737,7 @@ int __init init_ext4_mballoc(void)
void exit_ext4_mballoc(void)
{
+ int i;
/*
* Wait for completion of call_rcu()'s on ext4_pspace_cachep
* before destroying the slab cache.
@@ -2699,6 +2746,15 @@ void exit_ext4_mballoc(void)
kmem_cache_destroy(ext4_pspace_cachep);
kmem_cache_destroy(ext4_ac_cachep);
kmem_cache_destroy(ext4_free_ext_cachep);
+
+ for (i = 0; i < NR_GRPINFO_CACHES; i++) {
+ struct kmem_cache *cachep = ext4_groupinfo_caches[i];
+ if (cachep) {
+ char *name = (char *)kmem_cache_name(cachep);
+ kmem_cache_destroy(cachep);
+ kfree(name);
+ }
+ }
ext4_remove_debugfs_entry();
}
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