Re: Kernel bug: Bad page state: related to generic symlink code and mmap

From: Al Viro
Date: Fri Aug 19 2005 - 18:15:03 EST

On Sat, Aug 20, 2005 at 12:15:42AM +0100, Al Viro wrote:
>
> That looks OK except for
> * jffs2 is b0rken (see patch in another mail)
> * afs, autofs4, befs, devfs, freevxfs, jffs2, jfs, ncpfs, procfs,
> smbfs, sysvfs, ufs, xfs - prototype change for ->follow_link()
> * befs, smbfs, xfs - same for ->put_link()
> * ncpfs fix is actually missing here
>
> Prototype changes are covered by patch below (incremental on top of your +
> jffs2 fix upthread). No ncpfs changes - these will go separately, assuming
> you haven't done them yet; just a plain janitor stuff.


Gaack... And here's the patch itself - sorry.

diff -urN RC13-rc6-git10-base/fs/afs/mntpt.c current/fs/afs/mntpt.c
--- RC13-rc6-git10-base/fs/afs/mntpt.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/afs/mntpt.c 2005-08-19 19:02:48.000000000 -0400
@@ -30,7 +30,7 @@
struct dentry *dentry,
struct nameidata *nd);
static int afs_mntpt_open(struct inode *inode, struct file *file);
-static int afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd);
+static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd);

struct file_operations afs_mntpt_file_operations = {
.open = afs_mntpt_open,
@@ -233,7 +233,7 @@
/*
* follow a link from a mountpoint directory, thus causing it to be mounted
*/
-static int afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct vfsmount *newmnt;
struct dentry *old_dentry;
@@ -249,7 +249,7 @@
newmnt = afs_mntpt_do_automount(dentry);
if (IS_ERR(newmnt)) {
path_release(nd);
- return PTR_ERR(newmnt);
+ return (void *)newmnt;
}

old_dentry = nd->dentry;
@@ -267,7 +267,7 @@
}

kleave(" = %d", err);
- return err;
+ return ERR_PTR(err);
} /* end afs_mntpt_follow_link() */

/*****************************************************************************/
diff -urN RC13-rc6-git10-base/fs/autofs4/symlink.c current/fs/autofs4/symlink.c
--- RC13-rc6-git10-base/fs/autofs4/symlink.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/autofs4/symlink.c 2005-08-19 19:03:11.000000000 -0400
@@ -12,11 +12,11 @@

#include "autofs_i.h"

-static int autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct autofs_info *ino = autofs4_dentry_ino(dentry);
nd_set_link(nd, (char *)ino->u.symlink);
- return 0;
+ return NULL;
}

struct inode_operations autofs4_symlink_inode_operations = {
diff -urN RC13-rc6-git10-base/fs/befs/linuxvfs.c current/fs/befs/linuxvfs.c
--- RC13-rc6-git10-base/fs/befs/linuxvfs.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/befs/linuxvfs.c 2005-08-19 19:03:52.000000000 -0400
@@ -41,8 +41,8 @@
static void befs_destroy_inode(struct inode *inode);
static int befs_init_inodecache(void);
static void befs_destroy_inodecache(void);
-static int befs_follow_link(struct dentry *, struct nameidata *);
-static void befs_put_link(struct dentry *, struct nameidata *);
+static void *befs_follow_link(struct dentry *, struct nameidata *);
+static void befs_put_link(struct dentry *, struct nameidata *, void *);
static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
char **out, int *out_len);
static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
@@ -487,10 +487,10 @@
}

nd_set_link(nd, link);
- return 0;
+ return NULL;
}

-static void befs_put_link(struct dentry *dentry, struct nameidata *nd)
+static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
{
befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
diff -urN RC13-rc6-git10-base/fs/devfs/base.c current/fs/devfs/base.c
--- RC13-rc6-git10-base/fs/devfs/base.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/devfs/base.c 2005-08-19 19:04:17.000000000 -0400
@@ -2491,11 +2491,11 @@
return 0;
} /* End Function devfs_mknod */

-static int devfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *devfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct devfs_entry *p = get_devfs_entry_from_vfs_inode(dentry->d_inode);
nd_set_link(nd, p ? p->u.symlink.linkname : ERR_PTR(-ENODEV));
- return 0;
+ return NULL;
} /* End Function devfs_follow_link */

static struct inode_operations devfs_iops = {
diff -urN RC13-rc6-git10-base/fs/freevxfs/vxfs_immed.c current/fs/freevxfs/vxfs_immed.c
--- RC13-rc6-git10-base/fs/freevxfs/vxfs_immed.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/freevxfs/vxfs_immed.c 2005-08-19 19:04:41.000000000 -0400
@@ -38,7 +38,7 @@
#include "vxfs_inode.h"


-static int vxfs_immed_follow_link(struct dentry *, struct nameidata *);
+static void * vxfs_immed_follow_link(struct dentry *, struct nameidata *);

static int vxfs_immed_readpage(struct file *, struct page *);

@@ -77,7 +77,7 @@
{
struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
nd_set_link(np, vip->vii_immed.vi_immed);
- return 0;
+ return NULL;
}

/**
diff -urN RC13-rc6-git10-base/fs/jffs2/symlink.c current/fs/jffs2/symlink.c
--- RC13-rc6-git10-base/fs/jffs2/symlink.c 2005-08-19 19:01:07.000000000 -0400
+++ current/fs/jffs2/symlink.c 2005-08-19 19:05:10.000000000 -0400
@@ -18,7 +18,7 @@
#include <linux/namei.h>
#include "nodelist.h"

-static int jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);
+static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);

struct inode_operations jffs2_symlink_inode_operations =
{
@@ -27,7 +27,7 @@
.setattr = jffs2_setattr
};

-static int jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
char *p = (char *)f->dents;
@@ -60,6 +60,6 @@
* since the only way that may cause f->dents to be changed is iput() operation.
* But VFS will not use f->dents after iput() has been called.
*/
- return 0;
+ return NULL;
}

diff -urN RC13-rc6-git10-base/fs/jfs/symlink.c current/fs/jfs/symlink.c
--- RC13-rc6-git10-base/fs/jfs/symlink.c 2005-08-10 10:37:52.000000000 -0400
+++ current/fs/jfs/symlink.c 2005-08-19 19:05:27.000000000 -0400
@@ -22,11 +22,11 @@
#include "jfs_inode.h"
#include "jfs_xattr.h"

-static int jfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *jfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
char *s = JFS_IP(dentry->d_inode)->i_inline;
nd_set_link(nd, s);
- return 0;
+ return NULL;
}

struct inode_operations jfs_symlink_inode_operations = {
diff -urN RC13-rc6-git10-base/fs/proc/base.c current/fs/proc/base.c
--- RC13-rc6-git10-base/fs/proc/base.c 2005-08-10 10:37:52.000000000 -0400
+++ current/fs/proc/base.c 2005-08-19 19:06:23.000000000 -0400
@@ -890,7 +890,7 @@
};
#endif /* CONFIG_SECCOMP */

-static int proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
int error = -EACCES;
@@ -907,7 +907,7 @@
error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
nd->last_type = LAST_BIND;
out:
- return error;
+ return ERR_PTR(error);
}

static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
@@ -1692,11 +1692,11 @@
return vfs_readlink(dentry,buffer,buflen,tmp);
}

-static int proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
{
char tmp[30];
sprintf(tmp, "%d", current->tgid);
- return vfs_follow_link(nd,tmp);
+ return ERR_PTR(vfs_follow_link(nd,tmp));
}

static struct inode_operations proc_self_inode_operations = {
diff -urN RC13-rc6-git10-base/fs/proc/generic.c current/fs/proc/generic.c
--- RC13-rc6-git10-base/fs/proc/generic.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/proc/generic.c 2005-08-19 19:06:37.000000000 -0400
@@ -329,10 +329,10 @@
spin_unlock(&proc_inum_lock);
}

-static int proc_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd)
{
nd_set_link(nd, PDE(dentry->d_inode)->data);
- return 0;
+ return NULL;
}

static struct inode_operations proc_link_inode_operations = {
diff -urN RC13-rc6-git10-base/fs/smbfs/symlink.c current/fs/smbfs/symlink.c
--- RC13-rc6-git10-base/fs/smbfs/symlink.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/smbfs/symlink.c 2005-08-19 19:07:16.000000000 -0400
@@ -34,7 +34,7 @@
return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
}

-static int smb_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *smb_follow_link(struct dentry *dentry, struct nameidata *nd)
{
char *link = __getname();
DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
@@ -52,10 +52,10 @@
}
}
nd_set_link(nd, link);
- return 0;
+ return NULL;
}

-static void smb_put_link(struct dentry *dentry, struct nameidata *nd)
+static void smb_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
{
char *s = nd_get_link(nd);
if (!IS_ERR(s))
diff -urN RC13-rc6-git10-base/fs/sysv/symlink.c current/fs/sysv/symlink.c
--- RC13-rc6-git10-base/fs/sysv/symlink.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/sysv/symlink.c 2005-08-19 19:08:21.000000000 -0400
@@ -8,10 +8,10 @@
#include "sysv.h"
#include <linux/namei.h>

-static int sysv_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *sysv_follow_link(struct dentry *dentry, struct nameidata *nd)
{
nd_set_link(nd, (char *)SYSV_I(dentry->d_inode)->i_data);
- return 0;
+ return NULL;
}

struct inode_operations sysv_fast_symlink_inode_operations = {
diff -urN RC13-rc6-git10-base/fs/ufs/symlink.c current/fs/ufs/symlink.c
--- RC13-rc6-git10-base/fs/ufs/symlink.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/ufs/symlink.c 2005-08-19 19:08:40.000000000 -0400
@@ -29,11 +29,11 @@
#include <linux/namei.h>
#include <linux/ufs_fs.h>

-static int ufs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void *ufs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct ufs_inode_info *p = UFS_I(dentry->d_inode);
nd_set_link(nd, (char*)p->i_u1.i_symlink);
- return 0;
+ return NULL;
}

struct inode_operations ufs_fast_symlink_inode_operations = {
diff -urN RC13-rc6-git10-base/fs/xfs/linux-2.6/xfs_iops.c current/fs/xfs/linux-2.6/xfs_iops.c
--- RC13-rc6-git10-base/fs/xfs/linux-2.6/xfs_iops.c 2005-06-17 15:48:29.000000000 -0400
+++ current/fs/xfs/linux-2.6/xfs_iops.c 2005-08-19 19:07:59.000000000 -0400
@@ -374,7 +374,7 @@
* we need to be very careful about how much stack we use.
* uio is kmalloced for this reason...
*/
-STATIC int
+STATIC void *
linvfs_follow_link(
struct dentry *dentry,
struct nameidata *nd)
@@ -391,14 +391,14 @@
link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
if (!link) {
nd_set_link(nd, ERR_PTR(-ENOMEM));
- return 0;
+ return NULL;
}

uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
if (!uio) {
kfree(link);
nd_set_link(nd, ERR_PTR(-ENOMEM));
- return 0;
+ return NULL;
}

vp = LINVFS_GET_VP(dentry->d_inode);
@@ -422,10 +422,10 @@
kfree(uio);

nd_set_link(nd, link);
- return 0;
+ return NULL;
}

-static void linvfs_put_link(struct dentry *dentry, struct nameidata *nd)
+static void linvfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
{
char *s = nd_get_link(nd);
if (!IS_ERR(s))
-
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