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Date: Wed, 11 Mar 2015 19:52:21 +0800
From: Wanpeng Li <wanpeng.li@...ux.intel.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: Changman Lee <cm224.lee@...sung.com>,
Chao Yu <chao2.yu@...sung.com>,
linux-f2fs-devel@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
Wanpeng Li <wanpeng.li@...ux.intel.com>
Subject: [PATCH RFC] f2fs: add fast symlink
This patch add fast symlink for f2fs, I'm not sure if inline
interference with fast symlink, f2fs_follow_link can't be called
in my patch, so my patch still can't work correctly, please help
review and give comments to help me out.
Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
---
fs/f2fs/f2fs.h | 9 +++++++++
fs/f2fs/file.c | 2 ++
fs/f2fs/inode.c | 15 +++++++++++++--
fs/f2fs/namei.c | 44 +++++++++++++++++++++++++++++++++++++++++---
4 files changed, 65 insertions(+), 5 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 511d6cd..5938318 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1370,6 +1370,14 @@ static inline void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi)
sbi->sb->s_flags |= MS_RDONLY;
}
+/*
+ * Test whether an inode is a fast symlink.
+ */
+static inline int f2fs_inode_is_fast_symlink(struct inode *inode)
+{
+ return (S_ISLNK(inode->i_mode) && inode->i_blocks == 0);
+}
+
#define get_inode_mode(i) \
((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
(F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
@@ -1746,6 +1754,7 @@ extern const struct address_space_operations f2fs_node_aops;
extern const struct address_space_operations f2fs_meta_aops;
extern const struct inode_operations f2fs_dir_inode_operations;
extern const struct inode_operations f2fs_symlink_inode_operations;
+extern const struct inode_operations f2fs_fast_symlink_inode_operations;
extern const struct inode_operations f2fs_special_inode_operations;
extern struct kmem_cache *inode_entry_slab;
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f1341c7..05a3d4f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -546,6 +546,8 @@ void f2fs_truncate(struct inode *inode)
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode)))
return;
+ if (f2fs_inode_is_fast_symlink(inode))
+ return;
trace_f2fs_truncate(inode);
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index b508744..627fe6b 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -13,6 +13,7 @@
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/bitops.h>
+#include <linux/namei.h>
#include "f2fs.h"
#include "node.h"
@@ -188,8 +189,18 @@ make_now:
inode->i_mapping->a_ops = &f2fs_dblock_aops;
mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
} else if (S_ISLNK(inode->i_mode)) {
- inode->i_op = &f2fs_symlink_inode_operations;
- inode->i_mapping->a_ops = &f2fs_dblock_aops;
+ if (f2fs_inode_is_fast_symlink(inode)) {
+ struct page *node_page;
+
+ node_page = get_node_page(sbi, inode->i_ino);
+ inode->i_op = &f2fs_fast_symlink_inode_operations;
+ nd_terminate_link(F2FS_INODE(node_page)->i_addr,
+ inode->i_size,
+ sizeof(F2FS_INODE(node_page)->i_addr) - 1);
+ } else {
+ inode->i_op = &f2fs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &f2fs_dblock_aops;
+ }
} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
inode->i_op = &f2fs_special_inode_operations;
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 1e2ae21..ffc0d52 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -14,6 +14,7 @@
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/dcache.h>
+#include <linux/namei.h>
#include "f2fs.h"
#include "node.h"
@@ -247,6 +248,16 @@ fail:
return err;
}
+static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct page *node_page;
+
+ node_page = get_node_page(F2FS_I_SB(dentry->d_inode),
+ dentry->d_inode->i_ino);
+ nd_set_link(nd, (char *)(F2FS_INODE(node_page)->i_addr));
+ return NULL;
+}
+
static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{
@@ -254,6 +265,7 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
struct inode *inode;
size_t symlen = strlen(symname) + 1;
int err;
+ struct page *node_page;
f2fs_balance_fs(sbi);
@@ -261,16 +273,28 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
if (IS_ERR(inode))
return PTR_ERR(inode);
- inode->i_op = &f2fs_symlink_inode_operations;
- inode->i_mapping->a_ops = &f2fs_dblock_aops;
+ clear_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
+ clear_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
f2fs_lock_op(sbi);
err = f2fs_add_link(dentry, inode);
if (err)
goto out;
f2fs_unlock_op(sbi);
- err = page_symlink(inode, symname, symlen);
+ node_page = get_node_page(sbi, inode->i_ino);
+
+ if (symlen > sizeof(F2FS_INODE(node_page)->i_addr)) {
+ /* 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 */
+ inode->i_op = &f2fs_fast_symlink_inode_operations;
+ memcpy((char *)&F2FS_INODE(node_page)->i_addr, symname, symlen);
+ inode->i_size = symlen-1;
+ }
alloc_nid_done(sbi, inode->i_ino);
d_instantiate(dentry, inode);
@@ -743,6 +767,20 @@ 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,
--
2.1.0
--
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