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authorAmir Goldstein <amir73il@users.sf.net>2011-05-10 05:52:36 +0400
committerTheodore Ts'o <tytso@mit.edu>2011-05-10 05:52:36 +0400
commit44183d4231a52a797beb477f962e1d361e31299d (patch)
tree51ab7183ba8592db316cc189b063d49d8109d58f /fs/ext4
parent9b8b7d353f5f9bea758398c3af679ffa105e5cfe (diff)
downloadlinux-44183d4231a52a797beb477f962e1d361e31299d.tar.xz
ext4: remove alloc_semp
After taking care of all group init races, all that remains is to remove alloc_semp from ext4_allocation_context and ext4_buddy structs. Signed-off-by: Amir Goldstein <amir73il@users.sf.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/mballoc.c31
-rw-r--r--fs/ext4/mballoc.h6
2 files changed, 1 insertions, 36 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 1816eafb0a05..254f1f9fc4eb 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1130,24 +1130,8 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
e4b->bd_group = group;
e4b->bd_buddy_page = NULL;
e4b->bd_bitmap_page = NULL;
- e4b->alloc_semp = &grp->alloc_sem;
-
- /* Take the read lock on the group alloc
- * sem. This would make sure a parallel
- * ext4_mb_init_group happening on other
- * groups mapped by the page is blocked
- * till we are done with allocation
- */
-repeat_load_buddy:
- down_read(e4b->alloc_semp);
if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
- /* we need to check for group need init flag
- * with alloc_semp held so that we can be sure
- * that new blocks didn't get added to the group
- * when we are loading the buddy cache
- */
- up_read(e4b->alloc_semp);
/*
* we need full data about the group
* to make a good selection
@@ -1155,7 +1139,6 @@ repeat_load_buddy:
ret = ext4_mb_init_group(sb, group);
if (ret)
return ret;
- goto repeat_load_buddy;
}
/*
@@ -1247,9 +1230,6 @@ err:
page_cache_release(e4b->bd_buddy_page);
e4b->bd_buddy = NULL;
e4b->bd_bitmap = NULL;
-
- /* Done with the buddy cache */
- up_read(e4b->alloc_semp);
return ret;
}
@@ -1259,9 +1239,6 @@ static void ext4_mb_unload_buddy(struct ext4_buddy *e4b)
page_cache_release(e4b->bd_bitmap_page);
if (e4b->bd_buddy_page)
page_cache_release(e4b->bd_buddy_page);
- /* Done with the buddy cache */
- if (e4b->alloc_semp)
- up_read(e4b->alloc_semp);
}
@@ -1574,9 +1551,6 @@ static void ext4_mb_use_best_found(struct ext4_allocation_context *ac,
get_page(ac->ac_bitmap_page);
ac->ac_buddy_page = e4b->bd_buddy_page;
get_page(ac->ac_buddy_page);
- /* on allocation we use ac to track the held semaphore */
- ac->alloc_semp = e4b->alloc_semp;
- e4b->alloc_semp = NULL;
/* store last allocated for subsequent stream allocation */
if (ac->ac_flags & EXT4_MB_STREAM_ALLOC) {
spin_lock(&sbi->s_md_lock);
@@ -4188,15 +4162,12 @@ static int ext4_mb_release_context(struct ext4_allocation_context *ac)
spin_unlock(&pa->pa_lock);
}
}
- if (ac->alloc_semp)
- up_read(ac->alloc_semp);
if (pa) {
/*
* We want to add the pa to the right bucket.
* Remove it from the list and while adding
* make sure the list to which we are adding
- * doesn't grow big. We need to release
- * alloc_semp before calling ext4_mb_add_n_trim()
+ * doesn't grow big.
*/
if ((pa->pa_type == MB_GROUP_PA) && likely(pa->pa_free)) {
spin_lock(pa->pa_obj_lock);
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index 22bd4d7f289b..20b5e7bfebd1 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -193,11 +193,6 @@ struct ext4_allocation_context {
__u8 ac_op; /* operation, for history only */
struct page *ac_bitmap_page;
struct page *ac_buddy_page;
- /*
- * pointer to the held semaphore upon successful
- * block allocation
- */
- struct rw_semaphore *alloc_semp;
struct ext4_prealloc_space *ac_pa;
struct ext4_locality_group *ac_lg;
};
@@ -215,7 +210,6 @@ struct ext4_buddy {
struct super_block *bd_sb;
__u16 bd_blkbits;
ext4_group_t bd_group;
- struct rw_semaphore *alloc_semp;
};
#define EXT4_MB_BITMAP(e4b) ((e4b)->bd_bitmap)
#define EXT4_MB_BUDDY(e4b) ((e4b)->bd_buddy)