Please verify, this patch was not yet tested
---
Convert list_for_each_rcu() to list_for_each_entry_rcu()
Signed-off-by: Roel Kluin <[email protected]>
---
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index dd0fcfc..0c4dd13 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3127,6 +3127,7 @@ static void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
loff_t size, orig_size, start_off;
ext4_lblk_t start, orig_start;
struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
+ struct ext4_prealloc_space *pa;
/* do normalize only data requests, metadata requests
do not need preallocation */
@@ -3212,12 +3213,9 @@ static void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
/* check we don't cross already preallocated blocks */
rcu_read_lock();
- list_for_each_rcu(cur, &ei->i_prealloc_list) {
- struct ext4_prealloc_space *pa;
+ list_for_each_entry_rcu(pa, cur, &ei->i_prealloc_list, pa_inode_list) {
unsigned long pa_end;
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
-
if (pa->pa_deleted)
continue;
spin_lock(&pa->pa_lock);
@@ -3259,10 +3257,8 @@ static void ext4_mb_normalize_request(struct ext4_allocation_context *ac,
/* XXX: extra loop to check we really don't overlap preallocations */
rcu_read_lock();
- list_for_each_rcu(cur, &ei->i_prealloc_list) {
- struct ext4_prealloc_space *pa;
+ list_for_each_entry_rcu(pa, cur, &ei->i_prealloc_list, pa_inode_list) {
unsigned long pa_end;
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
spin_lock(&pa->pa_lock);
if (pa->pa_deleted == 0) {
pa_end = pa->pa_lstart + pa->pa_len;
@@ -3397,8 +3393,7 @@ static int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
/* first, try per-file preallocation */
rcu_read_lock();
- list_for_each_rcu(cur, &ei->i_prealloc_list) {
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+ list_for_each_entry_rcu(pa, cur, &ei->i_prealloc_list, pa_inode_list) {
/* all fields in this condition don't change,
* so we can skip locking for them */
@@ -3430,8 +3425,7 @@ static int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
return 0;
rcu_read_lock();
- list_for_each_rcu(cur, &lg->lg_prealloc_list) {
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+ list_for_each_entry_rcu(pa, cur, &lg->lg_prealloc_list, pa_inode_list) {
spin_lock(&pa->pa_lock);
if (pa->pa_deleted == 0 && pa->pa_free >= ac->ac_o_ex.fe_len) {
atomic_inc(&pa->pa_count);
On Tue, Feb 19, 2008 at 01:31:18AM +0100, Roel Kluin wrote:
> Please verify, this patch was not yet tested
> ---
> Convert list_for_each_rcu() to list_for_each_entry_rcu()
>
> Signed-off-by: Roel Kluin <[email protected]>
NACK. This patch doesn't build. You have extra cur in the conversion.
Right changes attached.
ext4: Convert list_for_each_rcu() to list_for_each_entry_rcu()
From: Aneesh Kumar K.V <[email protected]>
The list_for_each_entry_rcu() primitive should be used instead of
list_for_each_rcu(), as the former is easier to use and provides
better type safety.
http://groups.google.com/group/linux.kernel/browse_thread/thread/45749c83451cebeb/0633a65759ce7713?lnk=raot
Signed-off-by: Aneesh Kumar K.V <[email protected]>
---
fs/ext4/mballoc.c | 18 +++++-------------
1 files changed, 5 insertions(+), 13 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 52d3af2..89772b9 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3135,10 +3135,10 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
{
int bsbits, max;
ext4_lblk_t end;
- struct list_head *cur;
loff_t size, orig_size, start_off;
ext4_lblk_t start, orig_start;
struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
+ struct ext4_prealloc_space *pa;
/* do normalize only data requests, metadata requests
do not need preallocation */
@@ -3224,12 +3224,9 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
/* check we don't cross already preallocated blocks */
rcu_read_lock();
- list_for_each_rcu(cur, &ei->i_prealloc_list) {
- struct ext4_prealloc_space *pa;
+ list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
unsigned long pa_end;
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
-
if (pa->pa_deleted)
continue;
spin_lock(&pa->pa_lock);
@@ -3271,10 +3268,8 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
/* XXX: extra loop to check we really don't overlap preallocations */
rcu_read_lock();
- list_for_each_rcu(cur, &ei->i_prealloc_list) {
- struct ext4_prealloc_space *pa;
+ list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
unsigned long pa_end;
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
spin_lock(&pa->pa_lock);
if (pa->pa_deleted == 0) {
pa_end = pa->pa_lstart + pa->pa_len;
@@ -3401,7 +3396,6 @@ static noinline 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;
struct ext4_prealloc_space *pa;
- struct list_head *cur;
/* only data can be preallocated */
if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
@@ -3409,8 +3403,7 @@ static noinline int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
/* first, try per-file preallocation */
rcu_read_lock();
- list_for_each_rcu(cur, &ei->i_prealloc_list) {
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+ list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
/* all fields in this condition don't change,
* so we can skip locking for them */
@@ -3442,8 +3435,7 @@ static noinline int ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
return 0;
rcu_read_lock();
- list_for_each_rcu(cur, &lg->lg_prealloc_list) {
- pa = list_entry(cur, struct ext4_prealloc_space, pa_inode_list);
+ list_for_each_entry_rcu(pa, &lg->lg_prealloc_list, pa_inode_list) {
spin_lock(&pa->pa_lock);
if (pa->pa_deleted == 0 && pa->pa_free >= ac->ac_o_ex.fe_len) {
atomic_inc(&pa->pa_count);
Aneesh Kumar K.V wrote:
> On Tue, Feb 19, 2008 at 01:31:18AM +0100, Roel Kluin wrote:
>> Please verify, this patch was not yet tested
>> ---
>> Convert list_for_each_rcu() to list_for_each_entry_rcu()
>>
>> Signed-off-by: Roel Kluin <[email protected]>
>
>
> NACK. This patch doesn't build. You have extra cur in the conversion.
> Right changes attached.
>
> ext4: Convert list_for_each_rcu() to list_for_each_entry_rcu()
>
> From: Aneesh Kumar K.V <[email protected]>
>
> The list_for_each_entry_rcu() primitive should be used instead of
> list_for_each_rcu(), as the former is easier to use and provides
> better type safety.
Thanks for your review and correction,
Roel