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Message-id: <008701d061f3$55a0e7a0$00e2b6e0$@samsung.com>
Date: Thu, 19 Mar 2015 11:17:17 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: 'Wanpeng Li' <wanpeng.li@...ux.intel.com>,
'Jaegeuk Kim' <jaegeuk@...nel.org>
Cc: 'Changman Lee' <cm224.lee@...sung.com>,
linux-f2fs-devel@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH v3] f2fs: add fast symlink support
Hi Wanpeng,
> -----Original Message-----
> From: Wanpeng Li [mailto:wanpeng.li@...ux.intel.com]
> Sent: Thursday, March 19, 2015 7:02 AM
> To: Jaegeuk Kim
> Cc: Wanpeng Li; Changman Lee; Chao Yu; linux-f2fs-devel@...ts.sourceforge.net;
> linux-fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v3] f2fs: add fast symlink support
>
> Hi Jaegeuk,
> On Wed, Mar 18, 2015 at 11:05:28AM -0700, Jaegeuk Kim wrote:
> >Hi,
> >
> >On Wed, Mar 18, 2015 at 04:58:52PM +0800, Wanpeng Li wrote:
> >> Hi Jaegeuk,
> >> On Tue, Mar 17, 2015 at 10:21:27AM -0700, Jaegeuk Kim wrote:
> >> >> - err = page_symlink(inode, symname, symlen);
> >> >> +
> >> >> + if (symlen > MAX_FAST_SYMLINK_SIZE) {
> >> >> + /* slow symlink */
> >> >> + inode->i_op = &f2fs_symlink_inode_operations;
> >> >> + inode->i_mapping->a_ops = &f2fs_dblock_aops;
> >> >> + err = page_symlink(inode, symname, symlen);
> >> >> + } else {
> >> >> + /* fast symlink */
> >> >> + struct page *node_page;
> >> >> +
> >> >> + inode->i_op = &f2fs_fast_symlink_inode_operations;
> >> >> + node_page = get_node_page(sbi, inode->i_ino);
> >> >> + memcpy((char *)&F2FS_INODE(node_page)->i_addr, symname, symlen);
> >> >
> >> >This is mostly likewise the inline_data flow.
> >> >As of now, I can't recommend using any i_addr region, since we need to handle
> >> >many cases such as truncation, roll-forward recovery, and fsck/dump tools.
> >> >
> >> >It is more sensible to enable inline_data by default, isn't it?
> >>
> >> Do you mean to replace the codes above by something like
> >> f2fs_write_inline_data()?
> >
> >I meant the mount option, inline_data.
> >Currently, f2fs doesn't set that option at mount time, but I thought that we
> >can set it by default since it becomes stable.
>
> So I think you mean my codes should memcpy i_addr[1~872] instead of i_addr[0~872], right?
I think what Jaegeuk means is that we can use inline_data in f2fs by default with
patch like below firstly:
>From a7320bfe94239ea4ceb193621a3a1a4d11a40d07 Mon Sep 17 00:00:00 2001
From: Chao Yu <chao2.yu@...sung.com>
Date: Thu, 19 Mar 2015 10:02:08 +0800
Subject: [PATCH] f2fs: use inline_data by default
Use inline_data feature by default since it brings us better performance & space
utilization and now it is already stable.
Suggested-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Chao Yu <chao2.yu@...sung.com>
Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
---
fs/f2fs/super.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index fc6857f..8772d91 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -991,6 +991,7 @@ try_onemore:
sbi->active_logs = NR_CURSEG_TYPE;
set_opt(sbi, BG_GC);
+ set_opt(sbi, INLINE_DATA);
#ifdef CONFIG_F2FS_FS_XATTR
set_opt(sbi, XATTR_USER);
--
2.3.1
Then we enable inline_data feature for symlink in f2fs_may_inline, after that
by default our symlink created has inline_data flag in it, we treat small size
symlink as an inline regular file, we can write its data page which is written
in page_symlink into inode page like normal inline data procedure.
Thanks,
>
> Regards,
> Wanpeng Li
>
> >
> >Thanks,
> >
> >>
> >> Regards,
> >> Wanpeng Li
> >>
> >> >
> >> >Thanks,
> >> >
> >> >> + set_page_dirty(node_page);
> >> >> + f2fs_put_page(node_page, 1);
> >> >> + inode->i_size = symlen-1;
> >> >> + set_inode_flag(F2FS_I(inode), FI_FAST_SYMLINK);
> >> >> + mark_inode_dirty(inode);
> >> >> + }
> >> >> alloc_nid_done(sbi, inode->i_ino);
> >> >>
> >> >> d_instantiate(dentry, inode);
> >> >> @@ -743,6 +774,20 @@ const struct inode_operations f2fs_symlink_inode_operations = {
> >> >> #endif
> >> >> };
> >> >>
> >> >> +const struct inode_operations f2fs_fast_symlink_inode_operations = {
> >> >> + .readlink = generic_readlink,
> >> >> + .follow_link = f2fs_follow_link,
> >> >> + .put_link = page_put_link,
> >> >> + .getattr = f2fs_getattr,
> >> >> + .setattr = f2fs_setattr,
> >> >> +#ifdef CONFIG_F2FS_FS_XATTR
> >> >> + .setxattr = generic_setxattr,
> >> >> + .getxattr = generic_getxattr,
> >> >> + .listxattr = f2fs_listxattr,
> >> >> + .removexattr = generic_removexattr,
> >> >> +#endif
> >> >> +};
> >> >> +
> >> >> const struct inode_operations f2fs_special_inode_operations = {
> >> >> .getattr = f2fs_getattr,
> >> >> .setattr = f2fs_setattr,
> >> >> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> >> >> index 35a9117..efe28a2b 100644
> >> >> --- a/fs/f2fs/node.c
> >> >> +++ b/fs/f2fs/node.c
> >> >> @@ -908,8 +908,9 @@ void remove_inode_page(struct inode *inode)
> >> >> }
> >> >>
> >> >> /* remove potential inline_data blocks */
> >> >> - if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
> >> >> - S_ISLNK(inode->i_mode))
> >> >> + if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
> >> >> + S_ISLNK(inode->i_mode)) &&
> >> >> + !f2fs_inode_is_fast_symlink(inode))
> >> >> truncate_data_blocks_range(&dn, 1);
> >> >>
> >> >> /* 0 is possible, after f2fs_new_inode() has failed */
> >> >> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> >> >> index 502f28c..834880c 100644
> >> >> --- a/include/linux/f2fs_fs.h
> >> >> +++ b/include/linux/f2fs_fs.h
> >> >> @@ -178,9 +178,11 @@ struct f2fs_extent {
> >> >> #define F2FS_INLINE_DATA 0x02 /* file inline data flag */
> >> >> #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */
> >> >> #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */
> >> >> +#define F2FS_FAST_SYMLINK 0x10 /* file fast symlink flag */
> >> >>
> >> >> #define MAX_INLINE_DATA (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
> >> >> F2FS_INLINE_XATTR_ADDRS - 1))
> >> >> +#define MAX_FAST_SYMLINK_SIZE (MAX_INLINE_DATA + 1)
> >> >>
> >> >> struct f2fs_inode {
> >> >> __le16 i_mode; /* file mode */
> >> >> --
> >> >> 1.9.1
--
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