2013-10-22 06:58:23

by Gu Zheng

Subject: [PATCH V2] f2fs: introduce f2fs_kmem_cache_alloc to hide the unfailed, kmem cache allocation

Introduce the unfailed version of kmem_cache_alloc named f2fs_kmem_cache_alloc
to hide the retry routine and make the code a bit cleaner.

v2:
Fix the wrong use of 'retry' tag pointed out by Gao feng.
Use more neat code to remove redundant tag suggested by Haicheng Li.

Signed-off-by: Gu Zheng <[email protected]>
---
fs/f2fs/checkpoint.c | 26 +++++++-------------------
fs/f2fs/f2fs.h | 15 +++++++++++++++
fs/f2fs/gc.c | 8 ++------
fs/f2fs/node.c | 27 +++++++++++----------------
4 files changed, 35 insertions(+), 41 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 8d16071..6fb484c 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -226,12 +226,8 @@ void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
break;
orphan = NULL;
}
-retry:
- new = kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
- if (!new) {
- cond_resched();
- goto retry;
- }
+
+ new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
new->ino = ino;

/* add new_oentry into list which is sorted by inode number */
@@ -484,12 +480,8 @@ void set_dirty_dir_page(struct inode *inode, struct page *page)

if (!S_ISDIR(inode->i_mode))
return;
-retry:
- new = kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
- if (!new) {
- cond_resched();
- goto retry;
- }
+
+ new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
new->inode = inode;
INIT_LIST_HEAD(&new->list);

@@ -506,13 +498,9 @@ retry:
void add_dirty_dir_inode(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
- struct dir_inode_entry *new;
-retry:
- new = kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
- if (!new) {
- cond_resched();
- goto retry;
- }
+ struct dir_inode_entry *new =
+ f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
+
new->inode = inode;
INIT_LIST_HEAD(&new->list);

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 171c52f..2949275 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -18,6 +18,7 @@
#include <linux/crc32.h>
#include <linux/magic.h>
#include <linux/kobject.h>
+#include <linux/sched.h>

/*
* For mount options
@@ -787,6 +788,20 @@ static inline struct kmem_cache *f2fs_kmem_cache_create(const char *name,
return kmem_cache_create(name, size, 0, SLAB_RECLAIM_ACCOUNT, ctor);
}

+static inline void *f2fs_kmem_cache_alloc(struct kmem_cache *cachep,
+ gfp_t flags)
+{
+ void *entry;
+retry:
+ entry = kmem_cache_alloc(cachep, flags);
+ if (!entry) {
+ cond_resched();
+ goto retry;
+ }
+
+ return entry;
+}
+
#define RAW_IS_INODE(p) ((p)->footer.nid == (p)->footer.ino)

static inline bool IS_INODE(struct page *page)
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index fbad968..7914b92 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -361,12 +361,8 @@ static void add_gc_inode(struct inode *inode, struct list_head *ilist)
iput(inode);
return;
}
-repeat:
- new_ie = kmem_cache_alloc(winode_slab, GFP_NOFS);
- if (!new_ie) {
- cond_resched();
- goto repeat;
- }
+
+ new_ie = f2fs_kmem_cache_alloc(winode_slab, GFP_NOFS);
new_ie->inode = inode;
list_add_tail(&new_ie->list, ilist);
}
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index ef80f79..4fa3fd5 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1296,23 +1296,18 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
if (nid == 0)
return 0;

- if (!build)
- goto retry;
-
- /* do not add allocated nids */
- read_lock(&nm_i->nat_tree_lock);
- ne = __lookup_nat_cache(nm_i, nid);
- if (ne && nat_get_blkaddr(ne) != NULL_ADDR)
- allocated = true;
- read_unlock(&nm_i->nat_tree_lock);
- if (allocated)
- return 0;
-retry:
- i = kmem_cache_alloc(free_nid_slab, GFP_NOFS);
- if (!i) {
- cond_resched();
- goto retry;
+ if (build) {
+ /* do not add allocated nids */
+ read_lock(&nm_i->nat_tree_lock);
+ ne = __lookup_nat_cache(nm_i, nid);
+ if (ne && nat_get_blkaddr(ne) != NULL_ADDR)
+ allocated = true;
+ read_unlock(&nm_i->nat_tree_lock);
+ if (allocated)
+ return 0;
}
+
+ i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
i->nid = nid;
i->state = NID_NEW;

--
1.7.7

2013-10-22 12:30:42

by Jaegeuk Kim

Subject: Re: [PATCH V2] f2fs: introduce f2fs_kmem_cache_alloc to hide the unfailed, kmem cache allocation

Hi,

Looks good to me.

Thanks,

2013-10-22 (화), 14:52 +0800, Gu Zheng:
> Introduce the unfailed version of kmem_cache_alloc named f2fs_kmem_cache_alloc
> to hide the retry routine and make the code a bit cleaner.
>
> v2:
> Fix the wrong use of 'retry' tag pointed out by Gao feng.
> Use more neat code to remove redundant tag suggested by Haicheng Li.
>
> Signed-off-by: Gu Zheng <[email protected]>
> ---
> fs/f2fs/checkpoint.c | 26 +++++++-------------------
> fs/f2fs/f2fs.h | 15 +++++++++++++++
> fs/f2fs/gc.c | 8 ++------
> fs/f2fs/node.c | 27 +++++++++++----------------
> 4 files changed, 35 insertions(+), 41 deletions(-)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 8d16071..6fb484c 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -226,12 +226,8 @@ void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino)
> break;
> orphan = NULL;
> }
> -retry:
> - new = kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
> - if (!new) {
> - cond_resched();
> - goto retry;
> - }
> +
> + new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC);
> new->ino = ino;
>
> /* add new_oentry into list which is sorted by inode number */
> @@ -484,12 +480,8 @@ void set_dirty_dir_page(struct inode *inode, struct page *page)
>
> if (!S_ISDIR(inode->i_mode))
> return;
> -retry:
> - new = kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
> - if (!new) {
> - cond_resched();
> - goto retry;
> - }
> +
> + new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
> new->inode = inode;
> INIT_LIST_HEAD(&new->list);
>
> @@ -506,13 +498,9 @@ retry:
> void add_dirty_dir_inode(struct inode *inode)
> {
> struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
> - struct dir_inode_entry *new;
> -retry:
> - new = kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
> - if (!new) {
> - cond_resched();
> - goto retry;
> - }
> + struct dir_inode_entry *new =
> + f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS);
> +
> new->inode = inode;
> INIT_LIST_HEAD(&new->list);
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 171c52f..2949275 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -18,6 +18,7 @@
> #include <linux/crc32.h>
> #include <linux/magic.h>
> #include <linux/kobject.h>
> +#include <linux/sched.h>
>
> /*
> * For mount options
> @@ -787,6 +788,20 @@ static inline struct kmem_cache *f2fs_kmem_cache_create(const char *name,
> return kmem_cache_create(name, size, 0, SLAB_RECLAIM_ACCOUNT, ctor);
> }
>
> +static inline void *f2fs_kmem_cache_alloc(struct kmem_cache *cachep,
> + gfp_t flags)
> +{
> + void *entry;
> +retry:
> + entry = kmem_cache_alloc(cachep, flags);
> + if (!entry) {
> + cond_resched();
> + goto retry;
> + }
> +
> + return entry;
> +}
> +
> #define RAW_IS_INODE(p) ((p)->footer.nid == (p)->footer.ino)
>
> static inline bool IS_INODE(struct page *page)
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index fbad968..7914b92 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -361,12 +361,8 @@ static void add_gc_inode(struct inode *inode, struct list_head *ilist)
> iput(inode);
> return;
> }
> -repeat:
> - new_ie = kmem_cache_alloc(winode_slab, GFP_NOFS);
> - if (!new_ie) {
> - cond_resched();
> - goto repeat;
> - }
> +
> + new_ie = f2fs_kmem_cache_alloc(winode_slab, GFP_NOFS);
> new_ie->inode = inode;
> list_add_tail(&new_ie->list, ilist);
> }
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index ef80f79..4fa3fd5 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1296,23 +1296,18 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
> if (nid == 0)
> return 0;
>
> - if (!build)
> - goto retry;
> -
> - /* do not add allocated nids */
> - read_lock(&nm_i->nat_tree_lock);
> - ne = __lookup_nat_cache(nm_i, nid);
> - if (ne && nat_get_blkaddr(ne) != NULL_ADDR)
> - allocated = true;
> - read_unlock(&nm_i->nat_tree_lock);
> - if (allocated)
> - return 0;
> -retry:
> - i = kmem_cache_alloc(free_nid_slab, GFP_NOFS);
> - if (!i) {
> - cond_resched();
> - goto retry;
> + if (build) {
> + /* do not add allocated nids */
> + read_lock(&nm_i->nat_tree_lock);
> + ne = __lookup_nat_cache(nm_i, nid);
> + if (ne && nat_get_blkaddr(ne) != NULL_ADDR)
> + allocated = true;
> + read_unlock(&nm_i->nat_tree_lock);
> + if (allocated)
> + return 0;
> }
> +
> + i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
> i->nid = nid;
> i->state = NID_NEW;
>

--
Jaegeuk Kim
Samsung