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Date: Fri, 31 Oct 2008 22:20:57 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: cmm@...ibm.com, tytso@....edu, sandeen@...hat.com,
frederic.bohe@...l.net
Cc: linux-ext4@...r.kernel.org,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH 4/6] ext4: sparse annotate the group info semaphore
sparse annotate the group info allocation semaphore
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
fs/ext4/mballoc.c | 28 +++++++++++++++++++++++-----
1 files changed, 23 insertions(+), 5 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 390dc81..34a365e 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -895,6 +895,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
static noinline_for_stack int
ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
struct ext4_buddy *e4b)
+__acquires(e4b->alloc_semp)
{
int blocks_per_page;
int block;
@@ -926,6 +927,7 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
* till we are done with allocation
*/
down_read(e4b->alloc_semp);
+ __acquire(e4b->alloc_semp);
/*
* the buddy cache inode stores the block bitmap
@@ -1020,6 +1022,7 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
}
static void ext4_mb_release_desc(struct ext4_buddy *e4b)
+__releases(e4b->alloc_semp)
{
if (e4b->bd_bitmap_page)
page_cache_release(e4b->bd_bitmap_page);
@@ -1027,6 +1030,7 @@ static void ext4_mb_release_desc(struct ext4_buddy *e4b)
page_cache_release(e4b->bd_buddy_page);
/* Done with the buddy cache */
up_read(e4b->alloc_semp);
+ __release(e4b->alloc_semp);
}
@@ -1468,8 +1472,10 @@ static int ext4_mb_try_best_found(struct ext4_allocation_context *ac,
BUG_ON(ex.fe_len <= 0);
err = ext4_mb_load_buddy(ac->ac_sb, group, e4b);
- if (err)
+ if (err) {
+ __release(e4b->alloc_semp);
return err;
+ }
ext4_lock_group(ac->ac_sb, group);
max = mb_find_extent(e4b, 0, ex.fe_start, ex.fe_len, &ex);
@@ -1499,8 +1505,10 @@ static int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
return 0;
err = ext4_mb_load_buddy(ac->ac_sb, group, e4b);
- if (err)
+ if (err) {
+ __release(e4b->alloc_semp);
return err;
+ }
ext4_lock_group(ac->ac_sb, group);
max = mb_find_extent(e4b, 0, ac->ac_g_ex.fe_start,
@@ -1963,8 +1971,10 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
continue;
err = ext4_mb_load_buddy(sb, group, &e4b);
- if (err)
+ if (err) {
+ __release(e4b->alloc_semp);
goto out;
+ }
ext4_lock_group(sb, group);
if (!ext4_mb_good_group(ac, group, cr)) {
@@ -2275,6 +2285,7 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
sizeof(struct ext4_group_info);
err = ext4_mb_load_buddy(sb, group, &e4b);
if (err) {
+ __release(e4b->alloc_semp);
seq_printf(seq, "#%-5lu: I/O error\n", group);
return 0;
}
@@ -3820,6 +3831,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
err = ext4_mb_load_buddy(sb, group, &e4b);
if (err) {
+ __release(e4b->alloc_semp);
ext4_error(sb, __func__, "Error in loading buddy "
"information for %lu\n", group);
put_bh(bitmap_bh);
@@ -3987,6 +3999,7 @@ void ext4_discard_preallocations(struct inode *inode)
err = ext4_mb_load_buddy(sb, group, &e4b);
if (err) {
+ __release(e4b->alloc_semp);
ext4_error(sb, __func__, "Error in loading buddy "
"information for %lu\n", group);
continue;
@@ -4260,6 +4273,7 @@ ext4_mb_discard_lg_preallocations(struct super_block *sb,
ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, NULL);
if (ext4_mb_load_buddy(sb, group, &e4b)) {
+ __release(e4b->alloc_semp);
ext4_error(sb, __func__, "Error in loading buddy "
"information for %lu\n", group);
continue;
@@ -4720,8 +4734,10 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
}
err = ext4_mb_load_buddy(sb, block_group, &e4b);
- if (err)
+ if (err) {
+ __release(e4b->alloc_semp);
goto error_return;
+ }
if (metadata) {
/* blocks being freed are metadata. these blocks shouldn't
* be used until this transaction is committed */
@@ -4805,8 +4821,10 @@ ext4_mb_search_free_extents(struct inode *inode,
end = EXT4_BLOCKS_PER_GROUP(sb) - 1;
err = ext4_mb_load_buddy(sb, group_no, &e4b);
- if (err)
+ if (err) {
+ __release(e4b->alloc_semp);
return err;
+ }
/* We consider about the boot block if bs = 1k */
if (sb->s_blocksize == 1024)
--
1.6.0.3.514.g2f91b
--
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