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Date: Tue, 29 Oct 2013 23:27:33 +0800
From: Huajun Li <huajun.li.lee@...il.com>
To: "jaegeuk.kim" <jaegeuk.kim@...sung.com>
Cc: linux-f2fs-devel <linux-f2fs-devel@...ts.sourceforge.net>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Huajun Li <huajun.li@...el.com>,
Haicheng Li <haicheng.li@...ux.intel.com>,
Weihong Xu <weihong.xu@...el.com>
Subject: Re: [f2fs-dev 3/5] f2fs: Add a new function: f2fs_reserve_block()
On Tue, Oct 29, 2013 at 8:56 AM, Jaegeuk Kim <jaegeuk.kim@...sung.com> wrote:
> Hi Huajun,
>
> 2013-10-29 (화), 00:53 +0800, Huajun Li:
>> Hi Jaegeuk,
>>
>> Thanks for your kindly review and comments.
>>
>> On Mon, Oct 28, 2013 at 8:28 PM, Jaegeuk Kim <jaegeuk.kim@...sung.com> wrote:
>> > 2013-10-28 (월), 21:16 +0900, Jaegeuk Kim:
>> > Hi,
>> >
>> >>
>> >> 2013-10-26 (토), 00:01 +0800, Huajun Li:
>> >> > From: Huajun Li <huajun.li@...el.com>
>> >> >
>> >> > Add the function f2fs_reserve_block() to easily reserve new blocks.
>> >> >
>> >> > Signed-off-by: Huajun Li <huajun.li@...el.com>
>> >> > Signed-off-by: Haicheng Li <haicheng.li@...ux.intel.com>
>> >> > Signed-off-by: Weihong Xu <weihong.xu@...el.com>
>> >> > ---
>> >> > fs/f2fs/data.c | 29 ++++++++++++++++++-----------
>> >> > fs/f2fs/f2fs.h | 1 +
>> >> > 2 files changed, 19 insertions(+), 11 deletions(-)
>> >> >
>> >> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> >> > index c8887d8..7b31911 100644
>> >> > --- a/fs/f2fs/data.c
>> >> > +++ b/fs/f2fs/data.c
>> >> > @@ -64,6 +64,23 @@ int reserve_new_block(struct dnode_of_data *dn)
>> >> > return 0;
>> >> > }
>> >> >
>> >> > +int f2fs_reserve_block(struct inode *inode,
>> >> > + struct dnode_of_data *dn, pgoff_t index)
>> >>
>> >
>> > We don't need to get dnode_of_data from parameters, since it is
>> > used by this function only.
>>
>> After calling f2fs_reserve_block(), we need dn.data_blkaddr to check
>> whether it is NEW_ADDR. So IMO, it's nice to keep this parameter.
>>
>
> Ah, got it.
> BTW, I found another flows we can clean up wrt this issue.
> How about this?
>
This can clean up more codes, thanks a lot.
> ---
> fs/f2fs/data.c | 51 +++++++++++++++++++++++----------------------------
> fs/f2fs/f2fs.h | 1 +
> fs/f2fs/file.c | 39 ++++++---------------------------------
> 3 files changed, 30 insertions(+), 61 deletions(-)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index c8887d8..b8c4f76d 100644
> --- 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)
> {
> @@ -300,19 +316,9 @@ 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)
> @@ -644,21 +650,15 @@ 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;
>
> @@ -691,11 +691,6 @@ 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 c9d394c..e77ca20 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1112,6 +1112,7 @@ 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 2d4190a..21ef0d1 100644
> --- 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);
> @@ -531,22 +516,10 @@ 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);
> - 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);
> + ret = f2fs_reserve_block(&dn, index);
> f2fs_unlock_op(sbi);
> + if (ret)
> + break;
>
> if (pg_start == pg_end)
> new_size = offset + len;
> --
> 1.8.4.474.g128a96c
>
> --
> Jaegeuk Kim
> Samsung
>
--
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