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btrfs: reada_extent doesn't need kref for refcount 

All increments and decrements are under the same spinlock - have to be,
since they need to protect the radix_tree it's found in.  Just use
int, no need to wank with kref...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-08-29 16:31:33 -04:00
parent 10c28d937e
commit 99621b44aa
1 changed files with 7 additions and 11 deletions
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18
fs/btrfs/reada.c
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@ -68,7 +68,7 @@ struct reada_extent {
u32 blocksize;
int err;
struct list_head extctl;
struct kref refcnt;
int refcnt;
spinlock_t lock;
struct reada_zone *zones[BTRFS_MAX_MIRRORS];
int nzones;
@ -126,7 +126,7 @@ static int __readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
spin_lock(&fs_info->reada_lock);
re = radix_tree_lookup(&fs_info->reada_tree, index);
if (re)
kref_get(&re->refcnt);
re->refcnt++;
spin_unlock(&fs_info->reada_lock);
if (!re)
@ -336,7 +336,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
spin_lock(&fs_info->reada_lock);
re = radix_tree_lookup(&fs_info->reada_tree, index);
if (re)
kref_get(&re->refcnt);
re->refcnt++;
spin_unlock(&fs_info->reada_lock);
if (re)
@ -352,7 +352,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
re->top = *top;
INIT_LIST_HEAD(&re->extctl);
spin_lock_init(&re->lock);
kref_init(&re->refcnt);
re->refcnt = 1;
/*
* map block
@ -398,7 +398,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
if (ret == -EEXIST) {
re_exist = radix_tree_lookup(&fs_info->reada_tree, index);
BUG_ON(!re_exist);
kref_get(&re_exist->refcnt);
re_exist->refcnt++;
spin_unlock(&fs_info->reada_lock);
goto error;
}
@ -465,10 +465,6 @@ error:
return re_exist;
}
static void reada_kref_dummy(struct kref *kr)
{
}
static void reada_extent_put(struct btrfs_fs_info *fs_info,
struct reada_extent *re)
{
@ -476,7 +472,7 @@ static void reada_extent_put(struct btrfs_fs_info *fs_info,
unsigned long index = re->logical >> PAGE_CACHE_SHIFT;
spin_lock(&fs_info->reada_lock);
if (!kref_put(&re->refcnt, reada_kref_dummy)) {
if (--re->refcnt) {
spin_unlock(&fs_info->reada_lock);
return;
}
@ -671,7 +667,7 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
return 0;
}
dev->reada_next = re->logical + re->blocksize;
kref_get(&re->refcnt);
re->refcnt++;
spin_unlock(&fs_info->reada_lock);