Use struct path in fs_struct

* Use struct path in fs_struct.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Blunck 2008-02-14 19:34:38 -08:00 committed by Linus Torvalds
parent 5dd784d049
commit 6ac08c39a1
9 changed files with 87 additions and 111 deletions

View File

@ -1849,8 +1849,7 @@ char * d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
char *buf, int buflen)
{
char *res;
struct vfsmount *rootmnt;
struct dentry *root;
struct path root;
/*
* We have various synthetic filesystems that never get mounted. On
@ -1863,14 +1862,13 @@ char * d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
return dentry->d_op->d_dname(dentry, buf, buflen);
read_lock(&current->fs->lock);
rootmnt = mntget(current->fs->rootmnt);
root = dget(current->fs->root);
root = current->fs->root;
path_get(&current->fs->root);
read_unlock(&current->fs->lock);
spin_lock(&dcache_lock);
res = __d_path(dentry, vfsmnt, root, rootmnt, buf, buflen);
res = __d_path(dentry, vfsmnt, root.dentry, root.mnt, buf, buflen);
spin_unlock(&dcache_lock);
dput(root);
mntput(rootmnt);
path_put(&root);
return res;
}
@ -1916,28 +1914,28 @@ char *dynamic_dname(struct dentry *dentry, char *buffer, int buflen,
asmlinkage long sys_getcwd(char __user *buf, unsigned long size)
{
int error;
struct vfsmount *pwdmnt, *rootmnt;
struct dentry *pwd, *root;
struct path pwd, root;
char *page = (char *) __get_free_page(GFP_USER);
if (!page)
return -ENOMEM;
read_lock(&current->fs->lock);
pwdmnt = mntget(current->fs->pwdmnt);
pwd = dget(current->fs->pwd);
rootmnt = mntget(current->fs->rootmnt);
root = dget(current->fs->root);
pwd = current->fs->pwd;
path_get(&current->fs->pwd);
root = current->fs->root;
path_get(&current->fs->root);
read_unlock(&current->fs->lock);
error = -ENOENT;
/* Has the current directory has been unlinked? */
spin_lock(&dcache_lock);
if (pwd->d_parent == pwd || !d_unhashed(pwd)) {
if (pwd.dentry->d_parent == pwd.dentry || !d_unhashed(pwd.dentry)) {
unsigned long len;
char * cwd;
cwd = __d_path(pwd, pwdmnt, root, rootmnt, page, PAGE_SIZE);
cwd = __d_path(pwd.dentry, pwd.mnt, root.dentry, root.mnt,
page, PAGE_SIZE);
spin_unlock(&dcache_lock);
error = PTR_ERR(cwd);
@ -1955,10 +1953,8 @@ asmlinkage long sys_getcwd(char __user *buf, unsigned long size)
spin_unlock(&dcache_lock);
out:
dput(pwd);
mntput(pwdmnt);
dput(root);
mntput(rootmnt);
path_put(&pwd);
path_put(&root);
free_page((unsigned long) page);
return error;
}

View File

@ -549,16 +549,16 @@ walk_init_root(const char *name, struct nameidata *nd)
struct fs_struct *fs = current->fs;
read_lock(&fs->lock);
if (fs->altroot && !(nd->flags & LOOKUP_NOALT)) {
nd->path.mnt = mntget(fs->altrootmnt);
nd->path.dentry = dget(fs->altroot);
if (fs->altroot.dentry && !(nd->flags & LOOKUP_NOALT)) {
nd->path = fs->altroot;
path_get(&fs->altroot);
read_unlock(&fs->lock);
if (__emul_lookup_dentry(name,nd))
return 0;
read_lock(&fs->lock);
}
nd->path.mnt = mntget(fs->rootmnt);
nd->path.dentry = dget(fs->root);
nd->path = fs->root;
path_get(&fs->root);
read_unlock(&fs->lock);
return 1;
}
@ -755,8 +755,8 @@ static __always_inline void follow_dotdot(struct nameidata *nd)
struct dentry *old = nd->path.dentry;
read_lock(&fs->lock);
if (nd->path.dentry == fs->root &&
nd->path.mnt == fs->rootmnt) {
if (nd->path.dentry == fs->root.dentry &&
nd->path.mnt == fs->root.mnt) {
read_unlock(&fs->lock);
break;
}
@ -1078,8 +1078,8 @@ static int __emul_lookup_dentry(const char *name, struct nameidata *nd)
*/
nd->last_type = LAST_ROOT;
read_lock(&fs->lock);
nd->path.mnt = mntget(fs->rootmnt);
nd->path.dentry = dget(fs->root);
nd->path = fs->root;
path_get(&fs->root);
read_unlock(&fs->lock);
if (path_walk(name, nd) == 0) {
if (nd->path.dentry->d_inode) {
@ -1099,29 +1099,22 @@ void set_fs_altroot(void)
{
char *emul = __emul_prefix();
struct nameidata nd;
struct vfsmount *mnt = NULL, *oldmnt;
struct dentry *dentry = NULL, *olddentry;
struct path path = {}, old_path;
int err;
struct fs_struct *fs = current->fs;
if (!emul)
goto set_it;
err = path_lookup(emul, LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_NOALT, &nd);
if (!err) {
mnt = nd.path.mnt;
dentry = nd.path.dentry;
}
if (!err)
path = nd.path;
set_it:
write_lock(&fs->lock);
oldmnt = fs->altrootmnt;
olddentry = fs->altroot;
fs->altrootmnt = mnt;
fs->altroot = dentry;
old_path = fs->altroot;
fs->altroot = path;
write_unlock(&fs->lock);
if (olddentry) {
dput(olddentry);
mntput(oldmnt);
}
if (old_path.dentry)
path_put(&old_path);
}
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
@ -1139,21 +1132,21 @@ static int do_path_lookup(int dfd, const char *name,
if (*name=='/') {
read_lock(&fs->lock);
if (fs->altroot && !(nd->flags & LOOKUP_NOALT)) {
nd->path.mnt = mntget(fs->altrootmnt);
nd->path.dentry = dget(fs->altroot);
if (fs->altroot.dentry && !(nd->flags & LOOKUP_NOALT)) {
nd->path = fs->altroot;
path_get(&fs->altroot);
read_unlock(&fs->lock);
if (__emul_lookup_dentry(name,nd))
goto out; /* found in altroot */
read_lock(&fs->lock);
}
nd->path.mnt = mntget(fs->rootmnt);
nd->path.dentry = dget(fs->root);
nd->path = fs->root;
path_get(&fs->root);
read_unlock(&fs->lock);
} else if (dfd == AT_FDCWD) {
read_lock(&fs->lock);
nd->path.mnt = mntget(fs->pwdmnt);
nd->path.dentry = dget(fs->pwd);
nd->path = fs->pwd;
path_get(&fs->pwd);
read_unlock(&fs->lock);
} else {
struct dentry *dentry;

View File

@ -593,7 +593,7 @@ static int do_umount(struct vfsmount *mnt, int flags)
* (2) the usage count == 1 [parent vfsmount] + 1 [sys_umount]
*/
if (flags & MNT_EXPIRE) {
if (mnt == current->fs->rootmnt ||
if (mnt == current->fs->root.mnt ||
flags & (MNT_FORCE | MNT_DETACH))
return -EINVAL;
@ -628,7 +628,7 @@ static int do_umount(struct vfsmount *mnt, int flags)
* /reboot - static binary that would close all descriptors and
* call reboot(9). Then init(8) could umount root and exec /reboot.
*/
if (mnt == current->fs->rootmnt && !(flags & MNT_DETACH)) {
if (mnt == current->fs->root.mnt && !(flags & MNT_DETACH)) {
/*
* Special case for "unmounting" root ...
* we just try to remount it readonly.
@ -1559,17 +1559,17 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
while (p) {
q->mnt_ns = new_ns;
if (fs) {
if (p == fs->rootmnt) {
if (p == fs->root.mnt) {
rootmnt = p;
fs->rootmnt = mntget(q);
fs->root.mnt = mntget(q);
}
if (p == fs->pwdmnt) {
if (p == fs->pwd.mnt) {
pwdmnt = p;
fs->pwdmnt = mntget(q);
fs->pwd.mnt = mntget(q);
}
if (p == fs->altrootmnt) {
if (p == fs->altroot.mnt) {
altrootmnt = p;
fs->altrootmnt = mntget(q);
fs->altroot.mnt = mntget(q);
}
}
p = next_mnt(p, mnt_ns->root);
@ -1653,18 +1653,15 @@ out1:
void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
struct dentry *dentry)
{
struct dentry *old_root;
struct vfsmount *old_rootmnt;
struct path old_root;
write_lock(&fs->lock);
old_root = fs->root;
old_rootmnt = fs->rootmnt;
fs->rootmnt = mntget(mnt);
fs->root = dget(dentry);
fs->root.mnt = mntget(mnt);
fs->root.dentry = dget(dentry);
write_unlock(&fs->lock);
if (old_root) {
dput(old_root);
mntput(old_rootmnt);
}
if (old_root.dentry)
path_put(&old_root);
}
/*
@ -1674,20 +1671,16 @@ void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
void set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
struct dentry *dentry)
{
struct dentry *old_pwd;
struct vfsmount *old_pwdmnt;
struct path old_pwd;
write_lock(&fs->lock);
old_pwd = fs->pwd;
old_pwdmnt = fs->pwdmnt;
fs->pwdmnt = mntget(mnt);
fs->pwd = dget(dentry);
fs->pwd.mnt = mntget(mnt);
fs->pwd.dentry = dget(dentry);
write_unlock(&fs->lock);
if (old_pwd) {
dput(old_pwd);
mntput(old_pwdmnt);
}
if (old_pwd.dentry)
path_put(&old_pwd);
}
static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
@ -1702,12 +1695,12 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
if (fs) {
atomic_inc(&fs->count);
task_unlock(p);
if (fs->root == old_nd->path.dentry
&& fs->rootmnt == old_nd->path.mnt)
if (fs->root.dentry == old_nd->path.dentry
&& fs->root.mnt == old_nd->path.mnt)
set_fs_root(fs, new_nd->path.mnt,
new_nd->path.dentry);
if (fs->pwd == old_nd->path.dentry
&& fs->pwdmnt == old_nd->path.mnt)
if (fs->pwd.dentry == old_nd->path.dentry
&& fs->pwd.mnt == old_nd->path.mnt)
set_fs_pwd(fs, new_nd->path.mnt,
new_nd->path.dentry);
put_fs_struct(fs);
@ -1773,8 +1766,8 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
}
read_lock(&current->fs->lock);
user_nd.path.mnt = mntget(current->fs->rootmnt);
user_nd.path.dentry = dget(current->fs->root);
user_nd.path = current->fs->root;
path_get(&current->fs->root);
read_unlock(&current->fs->lock);
down_write(&namespace_sem);
mutex_lock(&old_nd.path.dentry->d_inode->i_mutex);

View File

@ -165,8 +165,8 @@ static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfs
}
if (fs) {
read_lock(&fs->lock);
*mnt = mntget(fs->pwdmnt);
*dentry = dget(fs->pwd);
*mnt = mntget(fs->pwd.mnt);
*dentry = dget(fs->pwd.dentry);
read_unlock(&fs->lock);
result = 0;
put_fs_struct(fs);
@ -186,8 +186,8 @@ static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vf
}
if (fs) {
read_lock(&fs->lock);
*mnt = mntget(fs->rootmnt);
*dentry = dget(fs->root);
*mnt = mntget(fs->root.mnt);
*dentry = dget(fs->root.dentry);
read_unlock(&fs->lock);
result = 0;
put_fs_struct(fs);

View File

@ -1,15 +1,13 @@
#ifndef _LINUX_FS_STRUCT_H
#define _LINUX_FS_STRUCT_H
struct dentry;
struct vfsmount;
#include <linux/path.h>
struct fs_struct {
atomic_t count;
rwlock_t lock;
int umask;
struct dentry * root, * pwd, * altroot;
struct vfsmount * rootmnt, * pwdmnt, * altrootmnt;
struct path root, pwd, altroot;
};
#define INIT_FS { \

View File

@ -193,10 +193,10 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
return err;
sys_chdir("/root");
ROOT_DEV = current->fs->pwdmnt->mnt_sb->s_dev;
ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
printk("VFS: Mounted root (%s filesystem)%s.\n",
current->fs->pwdmnt->mnt_sb->s_type->name,
current->fs->pwdmnt->mnt_sb->s_flags & MS_RDONLY ?
current->fs->pwd.mnt->mnt_sb->s_type->name,
current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
" readonly" : "");
return 0;
}

View File

@ -1697,8 +1697,8 @@ void __audit_getname(const char *name)
++context->name_count;
if (!context->pwd) {
read_lock(&current->fs->lock);
context->pwd = dget(current->fs->pwd);
context->pwdmnt = mntget(current->fs->pwdmnt);
context->pwd = dget(current->fs->pwd.dentry);
context->pwdmnt = mntget(current->fs->pwd.mnt);
read_unlock(&current->fs->lock);
}

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@ -512,14 +512,10 @@ static void __put_fs_struct(struct fs_struct *fs)
{
/* No need to hold fs->lock if we are killing it */
if (atomic_dec_and_test(&fs->count)) {
dput(fs->root);
mntput(fs->rootmnt);
dput(fs->pwd);
mntput(fs->pwdmnt);
if (fs->altroot) {
dput(fs->altroot);
mntput(fs->altrootmnt);
}
path_put(&fs->root);
path_put(&fs->pwd);
if (fs->altroot.dentry)
path_put(&fs->altroot);
kmem_cache_free(fs_cachep, fs);
}
}

View File

@ -600,16 +600,16 @@ static struct fs_struct *__copy_fs_struct(struct fs_struct *old)
rwlock_init(&fs->lock);
fs->umask = old->umask;
read_lock(&old->lock);
fs->rootmnt = mntget(old->rootmnt);
fs->root = dget(old->root);
fs->pwdmnt = mntget(old->pwdmnt);
fs->pwd = dget(old->pwd);
if (old->altroot) {
fs->altrootmnt = mntget(old->altrootmnt);
fs->altroot = dget(old->altroot);
fs->root = old->root;
path_get(&old->root);
fs->pwd = old->pwd;
path_get(&old->pwd);
if (old->altroot.dentry) {
fs->altroot = old->altroot;
path_get(&old->altroot);
} else {
fs->altrootmnt = NULL;
fs->altroot = NULL;
fs->altroot.mnt = NULL;
fs->altroot.dentry = NULL;
}
read_unlock(&old->lock);
}