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Date: Thu, 27 Sep 2007 14:48:21 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: linux-ext4 <linux-ext4@...r.kernel.org>,
Mingming Cao <cmm@...ibm.com>
Subject: mballoc update
Hi
This is the changes with which i am going to update the mballoc core patch.
There is a new FIXME in here which i would like others to look at.
Also the commit message is updated to explain the mballoc
approach.
Mingming,
I have placed the new patch at
http://www.radian.org/~kvaneesh/ext4/sep-27-2007/mballoc-core.patch
-aneesh
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index c4e6c92..3984959 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -312,7 +312,7 @@ static struct kmem_cache *ext4_pspace_cachep;
struct ext4_free_metadata {
unsigned short group;
unsigned short num;
- unsigned short blocks[EXT4_BB_MAX_BLOCKS];
+ ext4_grpblk_t blocks[EXT4_BB_MAX_BLOCKS];
struct list_head list;
};
@@ -347,7 +347,7 @@ struct ext4_prealloc_space {
spinlock_t pa_lock;
atomic_t pa_count;
unsigned pa_deleted;
- unsigned long pa_pstart; /* phys. block */
+ ext4_fsblk_t pa_pstart; /* phys. block */
unsigned long pa_lstart; /* log. block */
unsigned short pa_len; /* len of preallocated chunk */
unsigned short pa_free; /* how many blocks are free */
@@ -454,54 +454,47 @@ static void ext4_mb_store_history(struct ext4_allocation_context *ac);
#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
static struct proc_dir_entry *proc_root_ext4;
-
-int ext4_create(struct inode *, struct dentry *, int, struct nameidata *);
struct buffer_head *read_block_bitmap(struct super_block *, unsigned int);
ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp);
-void ext4_mb_release_blocks(struct super_block *, int);
-void ext4_mb_poll_new_transaction(struct super_block *, handle_t *);
-void ext4_mb_free_committed_blocks(struct super_block *);
-void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, int group);
-void ext4_mb_free_consumed_preallocations(struct ext4_allocation_context *ac);
-void ext4_mb_return_to_preallocation(struct inode *inode,
+
+static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, int group);
+static void ext4_mb_poll_new_transaction(struct super_block *, handle_t *);
+static void ext4_mb_free_committed_blocks(struct super_block *);
+static void ext4_mb_return_to_preallocation(struct inode *inode,
struct ext4_buddy *e4b, sector_t block,
int count);
-void ext4_mb_show_ac(struct ext4_allocation_context *ac);
-void ext4_mb_check_with_pa(struct ext4_buddy *e4b, int first, int count);
-void ext4_mb_put_pa(struct ext4_allocation_context *, struct super_block *,
+static void ext4_mb_show_ac(struct ext4_allocation_context *ac);
+static void ext4_mb_put_pa(struct ext4_allocation_context *, struct super_block *,
struct ext4_prealloc_space *pa);
-int ext4_mb_init_per_dev_proc(struct super_block *sb);
-int ext4_mb_destroy_per_dev_proc(struct super_block *sb);
+static int ext4_mb_init_per_dev_proc(struct super_block *sb);
+static int ext4_mb_destroy_per_dev_proc(struct super_block *sb);
-static inline void
-ext4_lock_group(struct super_block *sb, int group)
+static inline void ext4_lock_group(struct super_block *sb, int group)
{
bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT,
&EXT4_GROUP_INFO(sb, group)->bb_state);
}
-static inline void
-ext4_unlock_group(struct super_block *sb, int group)
+static inline void ext4_unlock_group(struct super_block *sb, int group)
{
bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT,
&EXT4_GROUP_INFO(sb, group)->bb_state);
}
-static inline int
-ext4_is_group_locked(struct super_block *sb, int group)
+static inline int ext4_is_group_locked(struct super_block *sb, int group)
{
return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
&EXT4_GROUP_INFO(sb, group)->bb_state);
}
-unsigned long ext4_grp_offs_to_block(struct super_block *sb,
+static ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
struct ext4_free_extent *fex)
{
- unsigned long block;
+ ext4_fsblk_t block;
- block = (unsigned long) fex->fe_group * EXT4_BLOCKS_PER_GROUP(sb)
+ block = (ext4_fsblk_t) fex->fe_group * EXT4_BLOCKS_PER_GROUP(sb)
+ fex->fe_start
+ le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
return block;
@@ -612,7 +605,7 @@ static inline void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
}
#ifdef DOUBLE_CHECK
-void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b,
+static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b,
int first, int count)
{
int i;
@@ -638,7 +631,7 @@ void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b,
}
}
-void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count)
+static void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count)
{
int i;
@@ -651,7 +644,7 @@ void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count)
}
}
-void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
+static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap)
{
if (memcmp(e4b->bd_info->bb_bitmap, bitmap, e4b->bd_sb->s_blocksize)) {
unsigned char *b1, *b2;
@@ -814,9 +807,9 @@ static inline int fmsb(unsigned short word)
return order;
}
-static inline void
-ext4_mb_mark_free_simple(struct super_block *sb, void *buddy, unsigned first,
- int len, struct ext4_group_info *grp)
+static inline void ext4_mb_mark_free_simple(struct super_block *sb,
+ void *buddy, unsigned first, int len,
+ struct ext4_group_info *grp)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
unsigned short min;
@@ -850,9 +843,8 @@ ext4_mb_mark_free_simple(struct super_block *sb, void *buddy, unsigned first,
}
}
-static void
-ext4_mb_generate_buddy(struct super_block *sb, void *buddy, void *bitmap,
- int group)
+static void ext4_mb_generate_buddy(struct super_block *sb,
+ void *buddy, void *bitmap, int group)
{
struct ext4_group_info *grp = EXT4_GROUP_INFO(sb, group);
unsigned short max = EXT4_BLOCKS_PER_GROUP(sb);
@@ -1480,7 +1472,7 @@ static void ext4_mb_use_best_found(struct ext4_allocation_context *ac,
* regular allocator, for general purposes allocation
*/
-void ext4_mb_check_limits(struct ext4_allocation_context *ac,
+static void ext4_mb_check_limits(struct ext4_allocation_context *ac,
struct ext4_buddy *e4b,
int finish_group)
{
@@ -1828,7 +1820,7 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
return 0;
}
-int ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
+static int ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
{
int group;
int i;
@@ -2312,8 +2304,7 @@ static void ext4_mb_history_init(struct super_block *sb)
/* if we can't allocate history, then we simple won't use it */
}
-static void
-ext4_mb_store_history(struct ext4_allocation_context *ac)
+static void ext4_mb_store_history(struct ext4_allocation_context *ac)
{
struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
struct ext4_mb_history h;
@@ -2351,7 +2342,7 @@ ext4_mb_store_history(struct ext4_allocation_context *ac)
#define ext4_mb_history_init(sb)
#endif
-int ext4_mb_init_backend(struct super_block *sb)
+static int ext4_mb_init_backend(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
int i;
@@ -2571,7 +2562,7 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
return 0;
}
-void ext4_mb_cleanup_pa(struct ext4_group_info *grp)
+static void ext4_mb_cleanup_pa(struct ext4_group_info *grp)
{
struct ext4_prealloc_space *pa;
struct list_head *cur, *tmp;
@@ -2658,7 +2649,7 @@ int ext4_mb_release(struct super_block *sb)
return 0;
}
-void ext4_mb_free_committed_blocks(struct super_block *sb)
+static void ext4_mb_free_committed_blocks(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
int err;
@@ -2851,7 +2842,7 @@ do { \
proc->write_proc = ext4_mb_write_##var; \
} while (0)
-int ext4_mb_init_per_dev_proc(struct super_block *sb)
+static int ext4_mb_init_per_dev_proc(struct super_block *sb)
{
mode_t mode = S_IFREG | S_IRUGO | S_IWUSR;
struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -2888,7 +2879,7 @@ err_out:
return -ENOMEM;
}
-int ext4_mb_destroy_per_dev_proc(struct super_block *sb)
+static int ext4_mb_destroy_per_dev_proc(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
char devname[64];
@@ -2939,7 +2930,7 @@ void exit_ext4_proc(void)
* Check quota and mark choosed space (ac->ac_b_ex) non-free in bitmaps
* Returns 0 if success or error code
*/
-int ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
+static int ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
handle_t *handle)
{
struct buffer_head *bitmap_bh = NULL;
@@ -3026,7 +3017,7 @@ out_err:
* here we normalize request for locality group
* XXX: should we try to preallocate more than the group has now?
*/
-void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac)
+static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
struct ext4_locality_group *lg = ac->ac_lg;
@@ -3041,7 +3032,7 @@ void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac)
* Normalization means making request better in terms of
* size and alignment
*/
-void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
+static void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
struct ext4_allocation_request *ar)
{
struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
@@ -3070,8 +3061,10 @@ void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
if (ac->ac_flags & EXT4_MB_HINT_NOPREALLOC)
return;
- if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC)
- return ext4_mb_normalize_group_request(ac);
+ if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) {
+ ext4_mb_normalize_group_request(ac);
+ return ;
+ }
bsbits = ac->ac_sb->s_blocksize_bits;
@@ -3215,7 +3208,7 @@ void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
(unsigned) orig_size, (unsigned) start);
}
-void ext4_mb_collect_stats(struct ext4_allocation_context *ac)
+static void ext4_mb_collect_stats(struct ext4_allocation_context *ac)
{
struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
@@ -3238,10 +3231,10 @@ void ext4_mb_collect_stats(struct ext4_allocation_context *ac)
/*
* use blocks preallocated to inode
*/
-void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
+static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
struct ext4_prealloc_space *pa)
{
- unsigned long start;
+ ext4_fsblk_t start;
unsigned long len;
/* found preallocated blocks, use them */
@@ -3265,7 +3258,7 @@ void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac,
/*
* use blocks preallocated to locality group
*/
-void ext4_mb_use_group_pa(struct ext4_allocation_context *ac,
+static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac,
struct ext4_prealloc_space *pa)
{
unsigned len = ac->ac_o_ex.fe_len;
@@ -3281,13 +3274,18 @@ void ext4_mb_use_group_pa(struct ext4_allocation_context *ac,
* possible race when tte group is being loaded concurrently
* instead we correct pa later, after blocks are marked
* in on-disk bitmap -- see ext4_mb_release_context() */
+ /*
+ * FIXME!! but the other CPUs can look at this particular
+ * pa and think that it have enought free blocks if we
+ * don't update pa_free here right ?
+ */
mb_debug("use %lu/%lu from group pa %p\n", pa->pa_lstart-len, len, pa);
}
/*
* search goal blocks in preallocated space
*/
-int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
+static int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
{
struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
struct ext4_locality_group *lg;
@@ -3355,7 +3353,7 @@ int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
* the function goes through all preallocation in this group and marks them
* used in in-core bitmap. buddy must be generated from this bitmap
*/
-void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, int group)
+static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, int group)
{
struct ext4_group_info *grp = EXT4_GROUP_INFO(sb, group);
struct ext4_prealloc_space *pa;
@@ -3389,7 +3387,6 @@ void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, int group)
mb_debug("prellocated %u for group %u\n", preallocated, group);
}
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 5)
static void ext4_mb_pa_callback(struct rcu_head *head)
{
struct ext4_prealloc_space *pa;
@@ -3397,19 +3394,12 @@ static void ext4_mb_pa_callback(struct rcu_head *head)
kmem_cache_free(ext4_pspace_cachep, pa);
}
#define mb_call_rcu(__pa) call_rcu(&(__pa)->u.pa_rcu, ext4_mb_pa_callback)
-#else
-static void ext4_mb_pa_callback(void *pa)
-{
- kmem_cache_free(ext4_pspace_cachep, pa);
-}
-#define mb_call_rcu(__pa) call_rcu(&(__pa)->u.pa_rcu, ext4_mb_pa_callback, pa)
-#endif
/*
* drops a reference to preallocated space descriptor
* if this was the last reference and the space is consumed
*/
-void ext4_mb_put_pa(struct ext4_allocation_context *ac,
+static void ext4_mb_put_pa(struct ext4_allocation_context *ac,
struct super_block *sb, struct ext4_prealloc_space *pa)
{
unsigned long grp;
@@ -3458,7 +3448,7 @@ void ext4_mb_put_pa(struct ext4_allocation_context *ac,
/*
* creates new preallocated space for given inode
*/
-int ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
+static int ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
struct ext4_prealloc_space *pa;
@@ -3545,7 +3535,7 @@ int ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
/*
* creates new preallocated space for locality group inodes belongs to
*/
-int ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
+static int ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
struct ext4_locality_group *lg;
@@ -3599,7 +3589,7 @@ int ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
return 0;
}
-int ext4_mb_new_preallocation(struct ext4_allocation_context *ac)
+static int ext4_mb_new_preallocation(struct ext4_allocation_context *ac)
{
int err;
@@ -3618,7 +3608,7 @@ int ext4_mb_new_preallocation(struct ext4_allocation_context *ac)
* the caller MUST hold group/inode locks.
* TODO: optimize the case when there are no in-core structures yet
*/
-int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
+static int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
struct buffer_head *bitmap_bh,
struct ext4_prealloc_space *pa)
{
@@ -3678,7 +3668,7 @@ int ext4_mb_release_inode_pa(struct ext4_buddy *e4b,
return err;
}
-int ext4_mb_release_group_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;
@@ -3714,7 +3704,7 @@ int ext4_mb_release_group_pa(struct ext4_buddy *e4b,
* - how many do we discard
* 1) how many requested
*/
-int ext4_mb_discard_group_preallocations(struct super_block *sb,
+static int ext4_mb_discard_group_preallocations(struct super_block *sb,
int group, int needed)
{
struct ext4_group_info *grp = EXT4_GROUP_INFO(sb, group);
@@ -3927,14 +3917,14 @@ repeat:
* XXX: at the moment, truncate (which is the only way to free blocks)
* discards all preallocations
*/
-void ext4_mb_return_to_preallocation(struct inode *inode,
+static void ext4_mb_return_to_preallocation(struct inode *inode,
struct ext4_buddy *e4b,
sector_t block, int count)
{
BUG_ON(!list_empty(&EXT4_I(inode)->i_prealloc_list));
}
-void ext4_mb_show_ac(struct ext4_allocation_context *ac)
+static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
{
#if 0
struct super_block *sb = ac->ac_sb;
@@ -3984,7 +3974,7 @@ void ext4_mb_show_ac(struct ext4_allocation_context *ac)
* based allocation
*/
-void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
+static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
{
struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
@@ -4015,7 +4005,7 @@ void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
down(&ac->ac_lg->lg_sem);
}
-int ext4_mb_initialize_context(struct ext4_allocation_context *ac,
+static int ext4_mb_initialize_context(struct ext4_allocation_context *ac,
struct ext4_allocation_request *ar)
{
struct super_block *sb = ar->inode->i_sb;
@@ -4086,7 +4076,7 @@ int ext4_mb_initialize_context(struct ext4_allocation_context *ac,
/*
* release all resource we used in allocation
*/
-int ext4_mb_release_context(struct ext4_allocation_context *ac)
+static int ext4_mb_release_context(struct ext4_allocation_context *ac)
{
if (ac->ac_pa) {
if (ac->ac_pa->pa_linear) {
@@ -4110,7 +4100,7 @@ int ext4_mb_release_context(struct ext4_allocation_context *ac)
return 0;
}
-int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
+static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
{
int i;
int ret;
@@ -4130,13 +4120,13 @@ int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
* it tries to use preallocation first, then falls back
* to usual allocation
*/
-unsigned long ext4_mb_new_blocks(handle_t *handle,
+ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
struct ext4_allocation_request *ar, int *errp)
{
struct ext4_allocation_context ac;
struct ext4_sb_info *sbi;
struct super_block *sb;
- unsigned long block = 0;
+ ext4_fsblk_t block = 0;
int freed;
int inquota;
@@ -4217,7 +4207,7 @@ out:
}
EXPORT_SYMBOL(ext4_mb_new_blocks);
-void ext4_mb_poll_new_transaction(struct super_block *sb, handle_t *handle)
+static void ext4_mb_poll_new_transaction(struct super_block *sb, handle_t *handle)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -4247,8 +4237,8 @@ void ext4_mb_poll_new_transaction(struct super_block *sb, handle_t *handle)
ext4_mb_free_committed_blocks(sb);
}
-int ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
- int group, int block, int count)
+static int ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
+ int group, ext4_grpblk_t block, int count)
{
struct ext4_group_info *db = e4b->bd_info;
struct super_block *sb = e4b->bd_sb;
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index a8d51ad..a07399e 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -981,10 +981,8 @@ extern long ext4_mb_stats;
extern long ext4_mb_max_to_scan;
extern int ext4_mb_init(struct super_block *, int);
extern int ext4_mb_release(struct super_block *);
-extern unsigned long ext4_mb_new_blocks(handle_t *, struct ext4_allocation_request *, int *);
+extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, struct ext4_allocation_request *, int *);
extern int ext4_mb_reserve_blocks(struct super_block *, int);
-extern void ext4_mb_release_blocks(struct super_block *, int);
-extern void ext4_mb_release_blocks(struct super_block *, int);
extern void ext4_mb_discard_inode_preallocations(struct inode *);
extern int __init init_ext4_proc(void);
extern void exit_ext4_proc(void);
-
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