f2fs: add a new function: f2fs_reserve_block()

Add the function f2fs_reserve_block() to easily reserve new blocks, and
use it to clean up more codes.

Signed-off-by: Huajun Li <huajun.li@intel.com>
Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
Signed-off-by: Weihong Xu <weihong.xu@intel.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 7117220..2d02cf3 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -64,6 +64,22 @@ int reserve_new_block(struct dnode_of_data *dn)
        return 0;
 }
 
+int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
+{
+       bool need_put = dn->inode_page ? false : true;
+       int err;
+
+       err = get_dnode_of_data(dn, index, ALLOC_NODE);
+       if (err)
+               return err;
+       if (dn->data_blkaddr == NULL_ADDR)
+               err = reserve_new_block(dn);
+
+       if (need_put)
+               f2fs_put_dnode(dn);
+       return err;
+}
+
 static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
                                        struct buffer_head *bh_result)
 {
@@ -314,19 +330,10 @@ struct page *get_new_data_page(struct inode *inode,
        int err;
 
        set_new_dnode(&dn, inode, npage, npage, 0);
-       err = get_dnode_of_data(&dn, index, ALLOC_NODE);
+       err = f2fs_reserve_block(&dn, index);
        if (err)
                return ERR_PTR(err);
 
-       if (dn.data_blkaddr == NULL_ADDR) {
-               if (reserve_new_block(&dn)) {
-                       if (!npage)
-                               f2fs_put_dnode(&dn);
-                       return ERR_PTR(-ENOSPC);
-               }
-       }
-       if (!npage)
-               f2fs_put_dnode(&dn);
 repeat:
        page = grab_cache_page(mapping, index);
        if (!page)
@@ -707,21 +714,15 @@ repeat:
        *pagep = page;
 
        f2fs_lock_op(sbi);
-
        set_new_dnode(&dn, inode, NULL, NULL, 0);
-       err = get_dnode_of_data(&dn, index, ALLOC_NODE);
-       if (err)
-               goto err;
-
-       if (dn.data_blkaddr == NULL_ADDR)
-               err = reserve_new_block(&dn);
-
-       f2fs_put_dnode(&dn);
-       if (err)
-               goto err;
-
+       err = f2fs_reserve_block(&dn, index);
        f2fs_unlock_op(sbi);
 
+       if (err) {
+               f2fs_put_page(page, 1);
+               return err;
+       }
+
        if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
                return 0;
 
@@ -754,11 +755,6 @@ out:
        SetPageUptodate(page);
        clear_cold_data(page);
        return 0;
-
-err:
-       f2fs_unlock_op(sbi);
-       f2fs_put_page(page, 1);
-       return err;
 }
 
 static int f2fs_write_end(struct file *file,

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 417280a..c8eb37e 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1130,6 +1130,7 @@ void destroy_checkpoint_caches(void);
  * data.c
  */
 int reserve_new_block(struct dnode_of_data *);
+int f2fs_reserve_block(struct dnode_of_data *, pgoff_t);
 void update_extent_cache(block_t, struct dnode_of_data *);
 struct page *find_data_page(struct inode *, pgoff_t, bool);
 struct page *get_lock_data_page(struct inode *, pgoff_t);

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 7d714f4..1cd8e44 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -33,7 +33,6 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
        struct page *page = vmf->page;
        struct inode *inode = file_inode(vma->vm_file);
        struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
-       block_t old_blk_addr;
        struct dnode_of_data dn;
        int err;
 
@@ -44,24 +43,10 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
        /* block allocation */
        f2fs_lock_op(sbi);
        set_new_dnode(&dn, inode, NULL, NULL, 0);
-       err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
-       if (err) {
-               f2fs_unlock_op(sbi);
-               goto out;
-       }
-
-       old_blk_addr = dn.data_blkaddr;
-
-       if (old_blk_addr == NULL_ADDR) {
-               err = reserve_new_block(&dn);
-               if (err) {
-                       f2fs_put_dnode(&dn);
-                       f2fs_unlock_op(sbi);
-                       goto out;
-               }
-       }
-       f2fs_put_dnode(&dn);
+       err = f2fs_reserve_block(&dn, page->index);
        f2fs_unlock_op(sbi);
+       if (err)
+               goto out;
 
        file_update_time(vma->vm_file);
        lock_page(page);
@@ -532,22 +517,11 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
 
                f2fs_lock_op(sbi);
                set_new_dnode(&dn, inode, NULL, NULL, 0);
-               ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
-               if (ret) {
-                       f2fs_unlock_op(sbi);
+               ret = f2fs_reserve_block(&dn, index);
+               f2fs_unlock_op(sbi);
+               if (ret)
                        break;
-               }
 
-               if (dn.data_blkaddr == NULL_ADDR) {
-                       ret = reserve_new_block(&dn);
-                       if (ret) {
-                               f2fs_put_dnode(&dn);
-                               f2fs_unlock_op(sbi);
-                               break;
-                       }
-               }
-               f2fs_put_dnode(&dn);
-               f2fs_unlock_op(sbi);
 
                if (pg_start == pg_end)
                        new_size = offset + len;