[PATCH 4/6] vfs: propagate the nameidata into the relevant vfs_*()

From: Herbert Poetzl
Date: Sat Jan 21 2006 - 03:40:39 EST

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;
; Bind Mount Extensions
;
; Copyright (C) 2003-2006 Herbert Pötzl <herbert@xxxxxxxxxxxx>
;
; propagate the nameidata into the relevant vfs_*() functions
; similar to the existing vfs_create() to allow for proper
; checks via may_create(), may_delete() and permission()
;
;
; Changelog:
;
; 0.01 - initial version
;

Signed-off-by: Herbert Pötzl <herbert@xxxxxxxxxxxx>

diff -NurpP --minimal linux-2.6.16-rc1/fs/namei.c linux-2.6.16-rc1-bme0.06.2-nd0.01/fs/namei.c
--- linux-2.6.16-rc1/fs/namei.c 2006-01-18 06:08:30 +0100
+++ linux-2.6.16-rc1-bme0.06.2-nd0.01/fs/namei.c 2006-01-21 09:08:56 +0100
@@ -1294,7 +1294,8 @@ static inline int check_sticky(struct in
* 10. We don't allow removal of NFS sillyrenamed files; it's handled by
* nfs_async_unlink().
*/
-static int may_delete(struct inode *dir,struct dentry *victim,int isdir)
+static int may_delete(struct inode *dir, struct dentry *victim,
+ int isdir, struct nameidata *nd)
{
int error;

@@ -1303,7 +1304,7 @@ static int may_delete(struct inode *dir,

BUG_ON(victim->d_parent->d_inode != dir);

- error = permission(dir,MAY_WRITE | MAY_EXEC, NULL);
+ error = permission(dir,MAY_WRITE | MAY_EXEC, nd);
if (error)
return error;
if (IS_APPEND(dir))
@@ -1720,9 +1721,10 @@ fail:
}
EXPORT_SYMBOL_GPL(lookup_create);

-int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+int vfs_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t dev, struct nameidata *nd)
{
- int error = may_create(dir, dentry, NULL);
+ int error = may_create(dir, dentry, nd);

if (error)
return error;
@@ -1771,11 +1773,12 @@ asmlinkage long sys_mknod(const char __u
error = vfs_create(nd.dentry->d_inode,dentry,mode,&nd);
break;
case S_IFCHR: case S_IFBLK:
- error = vfs_mknod(nd.dentry->d_inode,dentry,mode,
- new_decode_dev(dev));
+ error = vfs_mknod(nd.dentry->d_inode, dentry, mode,
+ new_decode_dev(dev), &nd);
break;
case S_IFIFO: case S_IFSOCK:
- error = vfs_mknod(nd.dentry->d_inode,dentry,mode,0);
+ error = vfs_mknod(nd.dentry->d_inode, dentry, mode,
+ 0, &nd);
break;
case S_IFDIR:
error = -EPERM;
@@ -1793,9 +1796,10 @@ out:
return error;
}

-int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+int vfs_mkdir(struct inode *dir, struct dentry *dentry,
+ int mode, struct nameidata *nd)
{
- int error = may_create(dir, dentry, NULL);
+ int error = may_create(dir, dentry, nd);

if (error)
return error;
@@ -1834,7 +1838,8 @@ asmlinkage long sys_mkdir(const char __u
if (!IS_ERR(dentry)) {
if (!IS_POSIXACL(nd.dentry->d_inode))
mode &= ~current->fs->umask;
- error = vfs_mkdir(nd.dentry->d_inode, dentry, mode);
+ error = vfs_mkdir(nd.dentry->d_inode, dentry,
+ mode, &nd);
dput(dentry);
}
mutex_unlock(&nd.dentry->d_inode->i_mutex);
@@ -1874,9 +1879,10 @@ void dentry_unhash(struct dentry *dentry
spin_unlock(&dcache_lock);
}

-int vfs_rmdir(struct inode *dir, struct dentry *dentry)
+int vfs_rmdir(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
{
- int error = may_delete(dir, dentry, 1);
+ int error = may_delete(dir, dentry, 1, nd);

if (error)
return error;
@@ -1937,7 +1943,7 @@ asmlinkage long sys_rmdir(const char __u
dentry = lookup_hash(&nd);
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
- error = vfs_rmdir(nd.dentry->d_inode, dentry);
+ error = vfs_rmdir(nd.dentry->d_inode, dentry, &nd);
dput(dentry);
}
mutex_unlock(&nd.dentry->d_inode->i_mutex);
@@ -1948,9 +1954,10 @@ exit:
return error;
}

-int vfs_unlink(struct inode *dir, struct dentry *dentry)
+int vfs_unlink(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
{
- int error = may_delete(dir, dentry, 0);
+ int error = may_delete(dir, dentry, 0, nd);

if (error)
return error;
@@ -2012,7 +2019,7 @@ asmlinkage long sys_unlink(const char __
inode = dentry->d_inode;
if (inode)
atomic_inc(&inode->i_count);
- error = vfs_unlink(nd.dentry->d_inode, dentry);
+ error = vfs_unlink(nd.dentry->d_inode, dentry, &nd);
exit2:
dput(dentry);
}
@@ -2031,9 +2038,10 @@ slashes:
goto exit2;
}

-int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, int mode)
+int vfs_symlink(struct inode *dir, struct dentry *dentry,
+ const char *oldname, int mode, struct nameidata *nd)
{
- int error = may_create(dir, dentry, NULL);
+ int error = may_create(dir, dentry, nd);

if (error)
return error;
@@ -2073,7 +2081,8 @@ asmlinkage long sys_symlink(const char _
dentry = lookup_create(&nd, 0);
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
- error = vfs_symlink(nd.dentry->d_inode, dentry, from, S_IALLUGO);
+ error = vfs_symlink(nd.dentry->d_inode, dentry,
+ from, S_IALLUGO, &nd);
dput(dentry);
}
mutex_unlock(&nd.dentry->d_inode->i_mutex);
@@ -2085,7 +2094,8 @@ out:
return error;
}

-int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
+int vfs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *new_dentry, struct nameidata *nd)
{
struct inode *inode = old_dentry->d_inode;
int error;
@@ -2093,7 +2103,7 @@ int vfs_link(struct dentry *old_dentry,
if (!inode)
return -ENOENT;

- error = may_create(dir, new_dentry, NULL);
+ error = may_create(dir, new_dentry, nd);
if (error)
return error;

@@ -2155,7 +2165,8 @@ asmlinkage long sys_link(const char __us
new_dentry = lookup_create(&nd, 0);
error = PTR_ERR(new_dentry);
if (!IS_ERR(new_dentry)) {
- error = vfs_link(old_nd.dentry, nd.dentry->d_inode, new_dentry);
+ error = vfs_link(old_nd.dentry, nd.dentry->d_inode,
+ new_dentry, &nd);
dput(new_dentry);
}
mutex_unlock(&nd.dentry->d_inode->i_mutex);
@@ -2282,14 +2293,14 @@ int vfs_rename(struct inode *old_dir, st
if (old_dentry->d_inode == new_dentry->d_inode)
return 0;

- error = may_delete(old_dir, old_dentry, is_dir);
+ error = may_delete(old_dir, old_dentry, is_dir, NULL);
if (error)
return error;

if (!new_dentry->d_inode)
error = may_create(new_dir, new_dentry, NULL);
else
- error = may_delete(new_dir, new_dentry, is_dir);
+ error = may_delete(new_dir, new_dentry, is_dir, NULL);
if (error)
return error;

diff -NurpP --minimal linux-2.6.16-rc1/fs/nfsd/vfs.c linux-2.6.16-rc1-bme0.06.2-nd0.01/fs/nfsd/vfs.c
--- linux-2.6.16-rc1/fs/nfsd/vfs.c 2006-01-18 06:08:34 +0100
+++ linux-2.6.16-rc1-bme0.06.2-nd0.01/fs/nfsd/vfs.c 2006-01-21 09:08:56 +0100
@@ -1159,13 +1159,13 @@ nfsd_create(struct svc_rqst *rqstp, stru
err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
break;
case S_IFDIR:
- err = vfs_mkdir(dirp, dchild, iap->ia_mode);
+ err = vfs_mkdir(dirp, dchild, iap->ia_mode, NULL);
break;
case S_IFCHR:
case S_IFBLK:
case S_IFIFO:
case S_IFSOCK:
- err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
+ err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev, NULL);
break;
default:
printk("nfsd: bad file type %o in nfsd_create\n", type);
@@ -1441,11 +1441,13 @@ nfsd_symlink(struct svc_rqst *rqstp, str
else {
strncpy(path_alloced, path, plen);
path_alloced[plen] = 0;
- err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
+ err = vfs_symlink(dentry->d_inode, dnew,
+ path_alloced, mode, NULL);
kfree(path_alloced);
}
} else
- err = vfs_symlink(dentry->d_inode, dnew, path, mode);
+ err = vfs_symlink(dentry->d_inode, dnew,
+ path, mode, NULL);

if (!err) {
if (EX_ISSYNC(fhp->fh_export))
@@ -1503,7 +1505,7 @@ nfsd_link(struct svc_rqst *rqstp, struct
dold = tfhp->fh_dentry;
dest = dold->d_inode;

- err = vfs_link(dold, dirp, dnew);
+ err = vfs_link(dold, dirp, dnew, NULL);
if (!err) {
if (EX_ISSYNC(ffhp->fh_export)) {
nfsd_sync_dir(ddir);
@@ -1664,9 +1666,9 @@ nfsd_unlink(struct svc_rqst *rqstp, stru
err = nfserr_perm;
} else
#endif
- err = vfs_unlink(dirp, rdentry);
+ err = vfs_unlink(dirp, rdentry, NULL);
} else { /* It's RMDIR */
- err = vfs_rmdir(dirp, rdentry);
+ err = vfs_rmdir(dirp, rdentry, NULL);
}

dput(rdentry);
diff -NurpP --minimal linux-2.6.16-rc1/fs/reiserfs/xattr.c linux-2.6.16-rc1-bme0.06.2-nd0.01/fs/reiserfs/xattr.c
--- linux-2.6.16-rc1/fs/reiserfs/xattr.c 2006-01-18 06:08:34 +0100
+++ linux-2.6.16-rc1-bme0.06.2-nd0.01/fs/reiserfs/xattr.c 2006-01-21 09:08:56 +0100
@@ -35,6 +35,7 @@
#include <linux/namei.h>
#include <linux/errno.h>
#include <linux/fs.h>
+#include <linux/mount.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
@@ -827,7 +828,7 @@ int reiserfs_delete_xattrs(struct inode
if (dir->d_inode->i_nlink <= 2) {
root = get_xa_root(inode->i_sb);
reiserfs_write_lock_xattrs(inode->i_sb);
- err = vfs_rmdir(root->d_inode, dir);
+ err = vfs_rmdir(root->d_inode, dir, NULL);
reiserfs_write_unlock_xattrs(inode->i_sb);
dput(root);
} else {
diff -NurpP --minimal linux-2.6.16-rc1/include/linux/fs.h linux-2.6.16-rc1-bme0.06.2-nd0.01/include/linux/fs.h
--- linux-2.6.16-rc1/include/linux/fs.h 2006-01-18 06:08:43 +0100
+++ linux-2.6.16-rc1-bme0.06.2-nd0.01/include/linux/fs.h 2006-01-21 09:08:56 +0100
@@ -901,12 +901,12 @@ static inline void unlock_super(struct s
*/
extern int vfs_permission(struct nameidata *, int);
extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
-extern int vfs_mkdir(struct inode *, struct dentry *, int);
-extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
-extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
-extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
-extern int vfs_rmdir(struct inode *, struct dentry *);
-extern int vfs_unlink(struct inode *, struct dentry *);
+extern int vfs_mkdir(struct inode *, struct dentry *, int, struct nameidata *);
+extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t, struct nameidata *);
+extern int vfs_symlink(struct inode *, struct dentry *, const char *, int, struct nameidata *);
+extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct nameidata *);
+extern int vfs_rmdir(struct inode *, struct dentry *, struct nameidata *);
+extern int vfs_unlink(struct inode *, struct dentry *, struct nameidata *);
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);

/*
diff -NurpP --minimal linux-2.6.16-rc1/ipc/mqueue.c linux-2.6.16-rc1-bme0.06.2-nd0.01/ipc/mqueue.c
--- linux-2.6.16-rc1/ipc/mqueue.c 2006-01-18 06:08:45 +0100
+++ linux-2.6.16-rc1-bme0.06.2-nd0.01/ipc/mqueue.c 2006-01-21 09:08:59 +0100
@@ -738,7 +738,7 @@ asmlinkage long sys_mq_unlink(const char
if (inode)
atomic_inc(&inode->i_count);

- err = vfs_unlink(dentry->d_parent->d_inode, dentry);
+ err = vfs_unlink(dentry->d_parent->d_inode, dentry, NULL);
out_err:
dput(dentry);

diff -NurpP --minimal linux-2.6.16-rc1/net/unix/af_unix.c linux-2.6.16-rc1-bme0.06.2-nd0.01/net/unix/af_unix.c
--- linux-2.6.16-rc1/net/unix/af_unix.c 2006-01-18 06:08:56 +0100
+++ linux-2.6.16-rc1-bme0.06.2-nd0.01/net/unix/af_unix.c 2006-01-21 09:09:04 +0100
@@ -781,7 +781,7 @@ static int unix_bind(struct socket *sock
*/
mode = S_IFSOCK |
(SOCK_INODE(sock)->i_mode & ~current->fs->umask);
- err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0);
+ err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0, NULL);
if (err)
goto out_mknod_dput;
mutex_unlock(&nd.dentry->d_inode->i_mutex);

-
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