Commit 2072f1af authored by Tejun Heo's avatar Tejun Heo Committed by Greg Kroah-Hartman

sysfs, kernfs: move symlink core code to fs/kernfs/symlink.c

Move core symlink code to fs/kernfs/symlink.c.  fs/sysfs/symlink.c now
only contains sysfs wrappers around kernfs interfaces.  The respective
declarations in fs/sysfs/sysfs.h are moved to
fs/kernfs/kernfs-internal.h.

This is pure relocation.
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 414985ae
...@@ -149,4 +149,9 @@ extern const struct file_operations kernfs_file_operations; ...@@ -149,4 +149,9 @@ extern const struct file_operations kernfs_file_operations;
void sysfs_unmap_bin_file(struct sysfs_dirent *sd); void sysfs_unmap_bin_file(struct sysfs_dirent *sd);
/*
* symlink.c
*/
extern const struct inode_operations sysfs_symlink_inode_operations;
#endif /* __KERNFS_INTERNAL_H */ #endif /* __KERNFS_INTERNAL_H */
...@@ -7,3 +7,142 @@ ...@@ -7,3 +7,142 @@
* *
* This file is released under the GPLv2. * This file is released under the GPLv2.
*/ */
#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/namei.h>
#include "kernfs-internal.h"
/**
* kernfs_create_link - create a symlink
* @parent: directory to create the symlink in
* @name: name of the symlink
* @target: target node for the symlink to point to
*
* Returns the created node on success, ERR_PTR() value on error.
*/
struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent,
const char *name,
struct sysfs_dirent *target)
{
struct sysfs_dirent *sd;
struct sysfs_addrm_cxt acxt;
int error;
sd = sysfs_new_dirent(name, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
if (!sd)
return ERR_PTR(-ENOMEM);
if (parent->s_flags & SYSFS_FLAG_NS)
sd->s_ns = target->s_ns;
sd->s_symlink.target_sd = target;
kernfs_get(target); /* ref owned by symlink */
sysfs_addrm_start(&acxt);
error = sysfs_add_one(&acxt, sd, parent);
sysfs_addrm_finish(&acxt);
if (!error)
return sd;
kernfs_put(sd);
return ERR_PTR(error);
}
static int sysfs_get_target_path(struct sysfs_dirent *parent_sd,
struct sysfs_dirent *target_sd, char *path)
{
struct sysfs_dirent *base, *sd;
char *s = path;
int len = 0;
/* go up to the root, stop at the base */
base = parent_sd;
while (base->s_parent) {
sd = target_sd->s_parent;
while (sd->s_parent && base != sd)
sd = sd->s_parent;
if (base == sd)
break;
strcpy(s, "../");
s += 3;
base = base->s_parent;
}
/* determine end of target string for reverse fillup */
sd = target_sd;
while (sd->s_parent && sd != base) {
len += strlen(sd->s_name) + 1;
sd = sd->s_parent;
}
/* check limits */
if (len < 2)
return -EINVAL;
len--;
if ((s - path) + len > PATH_MAX)
return -ENAMETOOLONG;
/* reverse fillup of target string from target to base */
sd = target_sd;
while (sd->s_parent && sd != base) {
int slen = strlen(sd->s_name);
len -= slen;
strncpy(s + len, sd->s_name, slen);
if (len)
s[--len] = '/';
sd = sd->s_parent;
}
return 0;
}
static int sysfs_getlink(struct dentry *dentry, char *path)
{
struct sysfs_dirent *sd = dentry->d_fsdata;
struct sysfs_dirent *parent_sd = sd->s_parent;
struct sysfs_dirent *target_sd = sd->s_symlink.target_sd;
int error;
mutex_lock(&sysfs_mutex);
error = sysfs_get_target_path(parent_sd, target_sd, path);
mutex_unlock(&sysfs_mutex);
return error;
}
static void *sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
if (page) {
error = sysfs_getlink(dentry, (char *) page);
if (error < 0)
free_page((unsigned long)page);
}
nd_set_link(nd, error ? ERR_PTR(error) : (char *)page);
return NULL;
}
static void sysfs_put_link(struct dentry *dentry, struct nameidata *nd,
void *cookie)
{
char *page = nd_get_link(nd);
if (!IS_ERR(page))
free_page((unsigned long)page);
}
const struct inode_operations sysfs_symlink_inode_operations = {
.setxattr = sysfs_setxattr,
.readlink = generic_readlink,
.follow_link = sysfs_follow_link,
.put_link = sysfs_put_link,
.setattr = sysfs_setattr,
.getattr = sysfs_getattr,
.permission = sysfs_permission,
};
...@@ -11,53 +11,13 @@ ...@@ -11,53 +11,13 @@
*/ */
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/mount.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/kobject.h> #include <linux/kobject.h>
#include <linux/namei.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/security.h> #include <linux/security.h>
#include "sysfs.h" #include "sysfs.h"
/**
* kernfs_create_link - create a symlink
* @parent: directory to create the symlink in
* @name: name of the symlink
* @target: target node for the symlink to point to
*
* Returns the created node on success, ERR_PTR() value on error.
*/
struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent,
const char *name,
struct sysfs_dirent *target)
{
struct sysfs_dirent *sd;
struct sysfs_addrm_cxt acxt;
int error;
sd = sysfs_new_dirent(name, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
if (!sd)
return ERR_PTR(-ENOMEM);
if (parent->s_flags & SYSFS_FLAG_NS)
sd->s_ns = target->s_ns;
sd->s_symlink.target_sd = target;
kernfs_get(target); /* ref owned by symlink */
sysfs_addrm_start(&acxt);
error = sysfs_add_one(&acxt, sd, parent);
sysfs_addrm_finish(&acxt);
if (!error)
return sd;
kernfs_put(sd);
return ERR_PTR(error);
}
static int sysfs_do_create_link_sd(struct sysfs_dirent *parent_sd, static int sysfs_do_create_link_sd(struct sysfs_dirent *parent_sd,
struct kobject *target, struct kobject *target,
const char *name, int warn) const char *name, int warn)
...@@ -235,100 +195,3 @@ int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *targ, ...@@ -235,100 +195,3 @@ int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *targ,
return result; return result;
} }
EXPORT_SYMBOL_GPL(sysfs_rename_link_ns); EXPORT_SYMBOL_GPL(sysfs_rename_link_ns);
static int sysfs_get_target_path(struct sysfs_dirent *parent_sd,
struct sysfs_dirent *target_sd, char *path)
{
struct sysfs_dirent *base, *sd;
char *s = path;
int len = 0;
/* go up to the root, stop at the base */
base = parent_sd;
while (base->s_parent) {
sd = target_sd->s_parent;
while (sd->s_parent && base != sd)
sd = sd->s_parent;
if (base == sd)
break;
strcpy(s, "../");
s += 3;
base = base->s_parent;
}
/* determine end of target string for reverse fillup */
sd = target_sd;
while (sd->s_parent && sd != base) {
len += strlen(sd->s_name) + 1;
sd = sd->s_parent;
}
/* check limits */
if (len < 2)
return -EINVAL;
len--;
if ((s - path) + len > PATH_MAX)
return -ENAMETOOLONG;
/* reverse fillup of target string from target to base */
sd = target_sd;
while (sd->s_parent && sd != base) {
int slen = strlen(sd->s_name);
len -= slen;
strncpy(s + len, sd->s_name, slen);
if (len)
s[--len] = '/';
sd = sd->s_parent;
}
return 0;
}
static int sysfs_getlink(struct dentry *dentry, char *path)
{
struct sysfs_dirent *sd = dentry->d_fsdata;
struct sysfs_dirent *parent_sd = sd->s_parent;
struct sysfs_dirent *target_sd = sd->s_symlink.target_sd;
int error;
mutex_lock(&sysfs_mutex);
error = sysfs_get_target_path(parent_sd, target_sd, path);
mutex_unlock(&sysfs_mutex);
return error;
}
static void *sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
if (page) {
error = sysfs_getlink(dentry, (char *) page);
if (error < 0)
free_page((unsigned long)page);
}
nd_set_link(nd, error ? ERR_PTR(error) : (char *)page);
return NULL;
}
static void sysfs_put_link(struct dentry *dentry, struct nameidata *nd,
void *cookie)
{
char *page = nd_get_link(nd);
if (!IS_ERR(page))
free_page((unsigned long)page);
}
const struct inode_operations sysfs_symlink_inode_operations = {
.setxattr = sysfs_setxattr,
.readlink = generic_readlink,
.follow_link = sysfs_follow_link,
.put_link = sysfs_put_link,
.setattr = sysfs_setattr,
.getattr = sysfs_getattr,
.permission = sysfs_permission,
};
...@@ -50,7 +50,6 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, ...@@ -50,7 +50,6 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
/* /*
* symlink.c * symlink.c
*/ */
extern const struct inode_operations sysfs_symlink_inode_operations;
int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target, int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,
const char *name); const char *name);
......
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