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-rw-r--r--fs/ext4/mballoc.c127
1 files changed, 82 insertions, 45 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 06d1f5292d3a..5e3c35191412 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -420,6 +420,7 @@
#define MB_DEFAULT_GROUP_PREALLOC 512
static struct kmem_cache *ext4_pspace_cachep;
+static struct kmem_cache *ext4_ac_cachep;
#ifdef EXT4_BB_MAX_BLOCKS
#undef EXT4_BB_MAX_BLOCKS
@@ -2959,12 +2960,19 @@ int __init init_ext4_mballoc(void)
if (ext4_pspace_cachep == NULL)
return -ENOMEM;
+ ext4_ac_cachep =
+ kmem_cache_create("ext4_alloc_context",
+ sizeof(struct ext4_allocation_context),
+ 0, SLAB_RECLAIM_ACCOUNT, NULL);
+ if (ext4_ac_cachep == NULL) {
+ kmem_cache_destroy(ext4_pspace_cachep);
+ return -ENOMEM;
+ }
#ifdef CONFIG_PROC_FS
proc_root_ext4 = proc_mkdir(EXT4_ROOT, proc_root_fs);
if (proc_root_ext4 == NULL)
printk(KERN_ERR "EXT4-fs: Unable to create %s\n", EXT4_ROOT);
#endif
-
return 0;
}
@@ -2972,6 +2980,7 @@ void exit_ext4_mballoc(void)
{
/* XXX: synchronize_rcu(); */
kmem_cache_destroy(ext4_pspace_cachep);
+ kmem_cache_destroy(ext4_ac_cachep);
#ifdef CONFIG_PROC_FS
remove_proc_entry(EXT4_ROOT, proc_root_fs);
#endif
@@ -3699,7 +3708,7 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
struct buffer_head *bitmap_bh,
struct ext4_prealloc_space *pa)
{
- struct ext4_allocation_context ac;
+ struct ext4_allocation_context *ac;
struct super_block *sb = e4b->bd_sb;
struct ext4_sb_info *sbi = EXT4_SB(sb);
unsigned long end;
@@ -3715,9 +3724,13 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
end = bit + pa->pa_len;
- ac.ac_sb = sb;
- ac.ac_inode = pa->pa_inode;
- ac.ac_op = EXT4_MB_HISTORY_DISCARD;
+ ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
+
+ if (ac) {
+ ac->ac_sb = sb;
+ ac->ac_inode = pa->pa_inode;
+ ac->ac_op = EXT4_MB_HISTORY_DISCARD;
+ }
while (bit < end) {
bit = ext4_find_next_zero_bit(bitmap_bh->b_data, end, bit);
@@ -3733,11 +3746,13 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
(unsigned) group);
free += next - bit;
- ac.ac_b_ex.fe_group = group;
- ac.ac_b_ex.fe_start = bit;
- ac.ac_b_ex.fe_len = next - bit;
- ac.ac_b_ex.fe_logical = 0;
- ext4_mb_store_history(&ac);
+ if (ac) {
+ ac->ac_b_ex.fe_group = group;
+ ac->ac_b_ex.fe_start = bit;
+ ac->ac_b_ex.fe_len = next - bit;
+ ac->ac_b_ex.fe_logical = 0;
+ ext4_mb_store_history(ac);
+ }
mb_free_blocks(pa->pa_inode, e4b, bit, next - bit);
bit = next + 1;
@@ -3751,6 +3766,8 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
}
BUG_ON(free != pa->pa_free);
atomic_add(free, &sbi->s_mb_discarded);
+ if (ac)
+ kmem_cache_free(ext4_ac_cachep, ac);
return err;
}
@@ -3758,12 +3775,15 @@ static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
static int ext4_mb_release_group_pa(struct ext4_buddy *e4b,
struct ext4_prealloc_space *pa)
{
- struct ext4_allocation_context ac;
+ struct ext4_allocation_context *ac;
struct super_block *sb = e4b->bd_sb;
ext4_group_t group;
ext4_grpblk_t bit;
- ac.ac_op = EXT4_MB_HISTORY_DISCARD;
+ ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
+
+ if (ac)
+ ac->ac_op = EXT4_MB_HISTORY_DISCARD;
BUG_ON(pa->pa_deleted == 0);
ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
@@ -3771,13 +3791,16 @@ static int ext4_mb_release_group_pa(struct ext4_buddy *e4b,
mb_free_blocks(pa->pa_inode, e4b, bit, pa->pa_len);
atomic_add(pa->pa_len, &EXT4_SB(sb)->s_mb_discarded);
- ac.ac_sb = sb;
- ac.ac_inode = NULL;
- ac.ac_b_ex.fe_group = group;
- ac.ac_b_ex.fe_start = bit;
- ac.ac_b_ex.fe_len = pa->pa_len;
- ac.ac_b_ex.fe_logical = 0;
- ext4_mb_store_history(&ac);
+ if (ac) {
+ ac->ac_sb = sb;
+ ac->ac_inode = NULL;
+ ac->ac_b_ex.fe_group = group;
+ ac->ac_b_ex.fe_start = bit;
+ ac->ac_b_ex.fe_len = pa->pa_len;
+ ac->ac_b_ex.fe_logical = 0;
+ ext4_mb_store_history(ac);
+ kmem_cache_free(ext4_ac_cachep, ac);
+ }
return 0;
}
@@ -4231,7 +4254,7 @@ static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
struct ext4_allocation_request *ar, int *errp)
{
- struct ext4_allocation_context ac;
+ struct ext4_allocation_context *ac = NULL;
struct ext4_sb_info *sbi;
struct super_block *sb;
ext4_fsblk_t block = 0;
@@ -4257,53 +4280,60 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
}
inquota = ar->len;
+ ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
+ if (!ac) {
+ *errp = -ENOMEM;
+ return 0;
+ }
+
ext4_mb_poll_new_transaction(sb, handle);
- *errp = ext4_mb_initialize_context(&ac, ar);
+ *errp = ext4_mb_initialize_context(ac, ar);
if (*errp) {
ar->len = 0;
goto out;
}
- ac.ac_op = EXT4_MB_HISTORY_PREALLOC;
- if (!ext4_mb_use_preallocated(&ac)) {
+ ac->ac_op = EXT4_MB_HISTORY_PREALLOC;
+ if (!ext4_mb_use_preallocated(ac)) {
- ac.ac_op = EXT4_MB_HISTORY_ALLOC;
- ext4_mb_normalize_request(&ac, ar);
+ ac->ac_op = EXT4_MB_HISTORY_ALLOC;
+ ext4_mb_normalize_request(ac, ar);
repeat:
/* allocate space in core */
- ext4_mb_regular_allocator(&ac);
+ ext4_mb_regular_allocator(ac);
/* as we've just preallocated more space than
* user requested orinally, we store allocated
* space in a special descriptor */
- if (ac.ac_status == AC_STATUS_FOUND &&
- ac.ac_o_ex.fe_len < ac.ac_b_ex.fe_len)
- ext4_mb_new_preallocation(&ac);
+ if (ac->ac_status == AC_STATUS_FOUND &&
+ ac->ac_o_ex.fe_len < ac->ac_b_ex.fe_len)
+ ext4_mb_new_preallocation(ac);
}
- if (likely(ac.ac_status == AC_STATUS_FOUND)) {
- ext4_mb_mark_diskspace_used(&ac, handle);
+ if (likely(ac->ac_status == AC_STATUS_FOUND)) {
+ ext4_mb_mark_diskspace_used(ac, handle);
*errp = 0;
- block = ext4_grp_offs_to_block(sb, &ac.ac_b_ex);
- ar->len = ac.ac_b_ex.fe_len;
+ block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex);
+ ar->len = ac->ac_b_ex.fe_len;
} else {
- freed = ext4_mb_discard_preallocations(sb, ac.ac_o_ex.fe_len);
+ freed = ext4_mb_discard_preallocations(sb, ac->ac_o_ex.fe_len);
if (freed)
goto repeat;
*errp = -ENOSPC;
- ac.ac_b_ex.fe_len = 0;
+ ac->ac_b_ex.fe_len = 0;
ar->len = 0;
- ext4_mb_show_ac(&ac);
+ ext4_mb_show_ac(ac);
}
- ext4_mb_release_context(&ac);
+ ext4_mb_release_context(ac);
out:
if (ar->len < inquota)
DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
+ kmem_cache_free(ext4_ac_cachep, ac);
return block;
}
static void ext4_mb_poll_new_transaction(struct super_block *sb,
@@ -4407,7 +4437,7 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
{
struct buffer_head *bitmap_bh = 0;
struct super_block *sb = inode->i_sb;
- struct ext4_allocation_context ac;
+ struct ext4_allocation_context *ac = NULL;
struct ext4_group_desc *gdp;
struct ext4_super_block *es;
unsigned long overflow;
@@ -4436,9 +4466,12 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
ext4_debug("freeing block %lu\n", block);
- ac.ac_op = EXT4_MB_HISTORY_FREE;
- ac.ac_inode = inode;
- ac.ac_sb = sb;
+ ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
+ if (ac) {
+ ac->ac_op = EXT4_MB_HISTORY_FREE;
+ ac->ac_inode = inode;
+ ac->ac_sb = sb;
+ }
do_more:
overflow = 0;
@@ -4504,10 +4537,12 @@ do_more:
BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
err = ext4_journal_dirty_metadata(handle, bitmap_bh);
- ac.ac_b_ex.fe_group = block_group;
- ac.ac_b_ex.fe_start = bit;
- ac.ac_b_ex.fe_len = count;
- ext4_mb_store_history(&ac);
+ if (ac) {
+ ac->ac_b_ex.fe_group = block_group;
+ ac->ac_b_ex.fe_start = bit;
+ ac->ac_b_ex.fe_len = count;
+ ext4_mb_store_history(ac);
+ }
if (metadata) {
/* blocks being freed are metadata. these blocks shouldn't
@@ -4548,5 +4583,7 @@ do_more:
error_return:
brelse(bitmap_bh);
ext4_std_error(sb, err);
+ if (ac)
+ kmem_cache_free(ext4_ac_cachep, ac);
return;
}