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

[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.

Signed-off-by: Gu Zheng <guz.f...@cn.fujitsu.com>
---
 fs/f2fs/checkpoint.c |   26 +++++++-------------------
 fs/f2fs/f2fs.h       |   13 +++++++++++++
 fs/f2fs/gc.c         |    8 ++------
 fs/f2fs/node.c       |    6 +-----
 4 files changed, 23 insertions(+), 30 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..fa9ad03 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -787,6 +787,19 @@ 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 = kmem_cache_alloc(cachep, flags);
+retry:
+       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..fe3cf8e 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1308,11 +1308,7 @@ static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t 
nid, bool build)
        if (allocated)
                return 0;
 retry:
-       i = kmem_cache_alloc(free_nid_slab, GFP_NOFS);
-       if (!i) {
-               cond_resched();
-               goto retry;
-       }
+       i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
        i->nid = nid;
        i->state = NID_NEW;
 
-- 
1.7.7

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