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.
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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