[PATCH 04/24] VFS: replace nameidata arg to ->put_link with a char*.

Al Viro
2015-04-20T18:20:05Z

From: NeilBrown <neilb@suse.de>

The only thing any ->put_link() function did with the
nameidata was to call nd_get_link() to get the link name.

So now just pass the link name directly.

This allows us to make nd_get_link() completely local to
namei.c.

Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
Documentation/filesystems/Locking | 2 +-
Documentation/filesystems/porting | 5 +++++
Documentation/filesystems/vfs.txt | 4 ++--
drivers/staging/lustre/lustre/llite/symlink.c | 2 +-
fs/configfs/symlink.c | 2 +-
fs/fuse/dir.c | 4 ++--
fs/hostfs/hostfs_kern.c | 3 +--
fs/hppfs/hppfs.c | 5 ++---
fs/kernfs/symlink.c | 3 +--
fs/libfs.c | 4 +---
fs/namei.c | 13 +++++++------
fs/overlayfs/inode.c | 4 ++--
fs/proc/inode.c | 2 +-
include/linux/fs.h | 6 +++---
include/linux/namei.h | 1 -
mm/shmem.c | 4 ++--
16 files changed, 32 insertions(+), 32 deletions(-)

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 7cdbca4..3fc99e0 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -51,7 +51,7 @@ prototypes:
struct inode *, struct dentry *, unsigned int);
int (*readlink) (struct dentry *, char __user *,int);
void * (*follow_link) (struct dentry *, struct nameidata *);
- void (*put_link) (struct dentry *, struct nameidata *, void *);
+ void (*put_link) (struct dentry *, char *, void *);
void (*truncate) (struct inode *);
int (*permission) (struct inode *, int, unsigned int);
int (*get_acl)(struct inode *, int);
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index e69274d..c1ee367 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -483,3 +483,8 @@ in your dentry operations instead.
--
[mandatory]
->aio_read/->aio_write are gone. Use ->read_iter/->write_iter.
+--
+[mandatory]
+ ->put_link now takes a 'char *' rather than a 'struct nameidata*'.
+ Instead of calling nd_get_link() on the later, just use the former
+ directly.
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 5d833b3..7bba952 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -350,8 +350,8 @@ struct inode_operations {
int (*rename2) (struct inode *, struct dentry *,
struct inode *, struct dentry *, unsigned int);
int (*readlink) (struct dentry *, char __user *,int);
- void * (*follow_link) (struct dentry *, struct nameidata *);
- void (*put_link) (struct dentry *, struct nameidata *, void *);
+ void * (*follow_link) (struct dentry *, struct nameidata *);
+ void (*put_link) (struct dentry *, char *, void *);
int (*permission) (struct inode *, int);
int (*get_acl)(struct inode *, int);
int (*setattr) (struct dentry *, struct iattr *);
diff --git a/drivers/staging/lustre/lustre/llite/symlink.c b/drivers/staging/lustre/lustre/llite/symlink.c
index 0615f86..a0bebc3 100644
--- a/drivers/staging/lustre/lustre/llite/symlink.c
+++ b/drivers/staging/lustre/lustre/llite/symlink.c
@@ -142,7 +142,7 @@ static void *ll_follow_link(struct dentry *dentry, struct nameidata *nd)
return request;
}

-static void ll_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+static void ll_put_link(struct dentry *dentry, char *link, void *cookie)
{
ptlrpc_req_finished(cookie);
}
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index cc9f254..e860ddb 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -296,7 +296,7 @@ static void *configfs_follow_link(struct dentry *dentry, struct nameidata *nd)
return NULL;
}

-static void configfs_put_link(struct dentry *dentry, struct nameidata *nd,
+static void configfs_put_link(struct dentry *dentry, char *link,
void *cookie)
{
if (cookie) {
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 0572bca..1453c6f 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1406,9 +1406,9 @@ static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
return NULL;
}

-static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
+static void fuse_put_link(struct dentry *dentry, char *link, void *c)
{
- free_link(nd_get_link(nd));
+ free_link(link);
}

static int fuse_dir_open(struct inode *inode, struct file *file)
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index b827aa4..5f40dfa 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -904,9 +904,8 @@ static void *hostfs_follow_link(struct dentry *dentry, struct nameidata *nd)
return NULL;
}

-static void hostfs_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+static void hostfs_put_link(struct dentry *dentry, char *s, void *cookie)
{
- char *s = nd_get_link(nd);
if (!IS_ERR(s))
__putname(s);
}
diff --git a/fs/hppfs/hppfs.c b/fs/hppfs/hppfs.c
index fa2bd53..237907e 100644
--- a/fs/hppfs/hppfs.c
+++ b/fs/hppfs/hppfs.c
@@ -649,13 +649,12 @@ static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
return d_inode(proc_dentry)->i_op->follow_link(proc_dentry, nd);
}

-static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
- void *cookie)
+static void hppfs_put_link(struct dentry *dentry, char *link, void *cookie)
{
struct dentry *proc_dentry = HPPFS_I(d_inode(dentry))->proc_dentry;

if (d_inode(proc_dentry)->i_op->put_link)
- d_inode(proc_dentry)->i_op->put_link(proc_dentry, nd, cookie);
+ d_inode(proc_dentry)->i_op->put_link(proc_dentry, link, cookie);
}

static const struct inode_operations hppfs_dir_iops = {
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
index 8a19889..2aa55cb 100644
--- a/fs/kernfs/symlink.c
+++ b/fs/kernfs/symlink.c
@@ -125,10 +125,9 @@ static void *kernfs_iop_follow_link(struct dentry *dentry, struct nameidata *nd)
return NULL;
}

-static void kernfs_iop_put_link(struct dentry *dentry, struct nameidata *nd,
+static void kernfs_iop_put_link(struct dentry *dentry, char *page,
void *cookie)
{
- char *page = nd_get_link(nd);
if (!IS_ERR(page))
free_page((unsigned long)page);
}
diff --git a/fs/libfs.c b/fs/libfs.c
index cb1fb4b..fe6041a 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1024,10 +1024,8 @@ int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync)
}
EXPORT_SYMBOL(noop_fsync);

-void kfree_put_link(struct dentry *dentry, struct nameidata *nd,
- void *cookie)
+void kfree_put_link(struct dentry *dentry, char *s, void *cookie)
{
- char *s = nd_get_link(nd);
if (!IS_ERR(s))
kfree(s);
}
diff --git a/fs/namei.c b/fs/namei.c
index bdd5067..3b52954 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -738,17 +738,16 @@ void nd_set_link(struct nameidata *nd, char *path)
}
EXPORT_SYMBOL(nd_set_link);

-char *nd_get_link(struct nameidata *nd)
+static inline char *nd_get_link(struct nameidata *nd)
{
return nd->saved_names[nd->depth];
}
-EXPORT_SYMBOL(nd_get_link);

static inline void put_link(struct nameidata *nd, struct path *link, void *cookie)
{
struct inode *inode = link->dentry->d_inode;
if (inode->i_op->put_link)
- inode->i_op->put_link(link->dentry, nd, cookie);
+ inode->i_op->put_link(link->dentry, nd_get_link(nd), cookie);
path_put(link);
}

@@ -4463,9 +4462,11 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
if (IS_ERR(cookie))
res = PTR_ERR(cookie);
else {
- res = readlink_copy(buffer, buflen, nd_get_link(&nd));
+ char *link = nd_get_link(&nd);
+
+ res = readlink_copy(buffer, buflen, link);
if (dentry->d_inode->i_op->put_link)
- dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
+ dentry->d_inode->i_op->put_link(dentry, link, cookie);
}
set_nameidata(saved);
return res;
@@ -4507,7 +4508,7 @@ void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
}
EXPORT_SYMBOL(page_follow_link_light);

-void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+void page_put_link(struct dentry *dentry, char *link, void *cookie)
{
struct page *page = cookie;

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 1b4b9c5e..f1abb51 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -172,7 +172,7 @@ static void *ovl_follow_link(struct dentry *dentry, struct nameidata *nd)
return data;
}

-static void ovl_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
+static void ovl_put_link(struct dentry *dentry, char *link, void *c)
{
struct inode *realinode;
struct ovl_link_data *data = c;
@@ -181,7 +181,7 @@ static void ovl_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
return;

realinode = data->realdentry->d_inode;
- realinode->i_op->put_link(data->realdentry, nd, data->cookie);
+ realinode->i_op->put_link(data->realdentry, link, data->cookie);
kfree(data);
}

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 8272aab..27fd86d 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -403,7 +403,7 @@ static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd)
return pde;
}

-static void proc_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
+static void proc_put_link(struct dentry *dentry, char *link, void *p)
{
unuse_pde(p);
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4356560..d407d59 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1604,7 +1604,7 @@ struct inode_operations {
struct posix_acl * (*get_acl)(struct inode *, int);

int (*readlink) (struct dentry *, char __user *,int);
- void (*put_link) (struct dentry *, struct nameidata *, void *);
+ void (*put_link) (struct dentry *, char *, void *);

int (*create) (struct inode *,struct dentry *, umode_t, bool);
int (*link) (struct dentry *,struct inode *,struct dentry *);
@@ -2696,12 +2696,12 @@ extern const struct file_operations generic_ro_fops;
extern int readlink_copy(char __user *, int, const char *);
extern int page_readlink(struct dentry *, char __user *, int);
extern void *page_follow_link_light(struct dentry *, struct nameidata *);
-extern void page_put_link(struct dentry *, struct nameidata *, void *);
+extern void page_put_link(struct dentry *, char *, void *);
extern int __page_symlink(struct inode *inode, const char *symname, int len,
int nofs);
extern int page_symlink(struct inode *inode, const char *symname, int len);
extern const struct inode_operations page_symlink_inode_operations;
-extern void kfree_put_link(struct dentry *, struct nameidata *, void *);
+extern void kfree_put_link(struct dentry *, char *, void *);
extern int generic_readlink(struct dentry *, char __user *, int);
extern void generic_fillattr(struct inode *, struct kstat *);
int vfs_getattr_nosec(struct path *path, struct kstat *stat);
diff --git a/include/linux/namei.h b/include/linux/namei.h
index c899077..2ec27f2 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -72,7 +72,6 @@ extern void unlock_rename(struct dentry *, struct dentry *);

extern void nd_jump_link(struct nameidata *nd, struct path *path);
extern void nd_set_link(struct nameidata *nd, char *path);
-extern char *nd_get_link(struct nameidata *nd);

static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
{
diff --git a/mm/shmem.c b/mm/shmem.c
index de98137..00707f8 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2490,9 +2490,9 @@ static void *shmem_follow_link(struct dentry *dentry, struct nameidata *nd)
return page;
}

-static void shmem_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+static void shmem_put_link(struct dentry *dentry, char *link, void *cookie)
{
- if (!IS_ERR(nd_get_link(nd))) {
+ if (!IS_ERR(link)) {
struct page *page = cookie;
kunmap(page);
mark_page_accessed(page);
--
2.1.4