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Message-ID: <20110909062210.GO28162@sun>
Date: Fri, 9 Sep 2011 10:22:11 +0400
From: Cyrill Gorcunov <gorcunov@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Vasiliy Kulikov <segoon@...nwall.com>, Tejun Heo <tj@...nel.org>,
"Kirill A. Shutemov" <kirill@...temov.name>,
containers@...ts.osdl.org, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, Nathan Lynch <ntl@...ox.com>,
kernel-hardening@...ts.openwall.com,
Oren Laadan <orenl@...columbia.edu>,
Daniel Lezcano <dlezcano@...ibm.com>,
Glauber Costa <glommer@...allels.com>,
James Bottomley <jbottomley@...allels.com>,
Alexey Dobriyan <adobriyan@...il.com>,
Al Viro <viro@...IV.linux.org.uk>,
Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map_files/
directory v6
On Thu, Sep 08, 2011 at 11:00:20PM -0700, Andrew Morton wrote:
...
> >
> > Hmm. I never saw this warning. (Andrew, I'm still unable to fetch
> > your current -mm tree, is there some place other than kernel.org?
>
> Nope, sorry - we're dead in the water at present.
>
> > So the patch is done on top of 3.1-rc3). I guess this warrning is
> > from p = flex_array_get(fa, i); ? (since I don't have any warning
> > at all).
>
> The warning is from
>
> ei->op.proc_get_link = proc_map_files_get_link;
>
> The lhs has type
>
> union proc_op {
> int (*proc_get_link)(struct inode *, struct path *);
>
> and the rhs has type
>
> static int proc_map_files_get_link(struct dentry *dentry, struct path *path)
>
> So we end up passing an inode* to a function which expects a dentry*.
>
> That's in 3.1-rc4. proc_op.proc_get_link() hasn't changed since 3.0 (at least).
Crap. I know what happened. At first proposal time Tejun (iirc ;) said that
is might be better to separate proc_get_link change. I did so... and of
course I forgot to send it out ;) Ie it's in my queue and I dont see any
warnings for that reason. Sorry for that. Attached below.
---
From: Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: fs, proc: Make proc_get_link to use dentry instead of inode
This patch prepares the ground for the next "map_files"
patch which needs a name of a link file to analyse.
So instead of squashing this change into one big
patch the separate one is done.
Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
CC: Pavel Emelyanov <xemul@...allels.com>
CC: Tejun Heo <tj@...nel.org>
CC: Vasiliy Kulikov <segoon@...nwall.com>
CC: "Kirill A. Shutemov" <kirill@...temov.name>
CC: Alexey Dobriyan <adobriyan@...il.com>
CC: Al Viro <viro@...IV.linux.org.uk>
CC: Andrew Morton <akpm@...ux-foundation.org>
---
fs/proc/base.c | 20 ++++++++++----------
include/linux/proc_fs.h | 2 +-
2 files changed, 11 insertions(+), 11 deletions(-)
Index: linux-2.6.git/fs/proc/base.c
===================================================================
--- linux-2.6.git.orig/fs/proc/base.c
+++ linux-2.6.git/fs/proc/base.c
@@ -165,9 +165,9 @@ static int get_task_root(struct task_str
return result;
}
-static int proc_cwd_link(struct inode *inode, struct path *path)
+static int proc_cwd_link(struct dentry *dentry, struct path *path)
{
- struct task_struct *task = get_proc_task(inode);
+ struct task_struct *task = get_proc_task(dentry->d_inode);
int result = -ENOENT;
if (task) {
@@ -182,9 +182,9 @@ static int proc_cwd_link(struct inode *i
return result;
}
-static int proc_root_link(struct inode *inode, struct path *path)
+static int proc_root_link(struct dentry *dentry, struct path *path)
{
- struct task_struct *task = get_proc_task(inode);
+ struct task_struct *task = get_proc_task(dentry->d_inode);
int result = -ENOENT;
if (task) {
@@ -1580,13 +1580,13 @@ static const struct file_operations proc
.release = single_release,
};
-static int proc_exe_link(struct inode *inode, struct path *exe_path)
+static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
{
struct task_struct *task;
struct mm_struct *mm;
struct file *exe_file;
- task = get_proc_task(inode);
+ task = get_proc_task(dentry->d_inode);
if (!task)
return -ENOENT;
mm = get_task_mm(task);
@@ -1616,7 +1616,7 @@ static void *proc_pid_follow_link(struct
if (!proc_fd_access_allowed(inode))
goto out;
- error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
+ error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path);
out:
return ERR_PTR(error);
}
@@ -1655,7 +1655,7 @@ static int proc_pid_readlink(struct dent
if (!proc_fd_access_allowed(inode))
goto out;
- error = PROC_I(inode)->op.proc_get_link(inode, &path);
+ error = PROC_I(inode)->op.proc_get_link(dentry, &path);
if (error)
goto out;
@@ -1947,9 +1947,9 @@ static int proc_fd_info(struct inode *in
return -ENOENT;
}
-static int proc_fd_link(struct inode *inode, struct path *path)
+static int proc_fd_link(struct dentry *dentry, struct path *path)
{
- return proc_fd_info(inode, path, NULL);
+ return proc_fd_info(dentry->d_inode, path, NULL);
}
static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
Index: linux-2.6.git/include/linux/proc_fs.h
===================================================================
--- linux-2.6.git.orig/include/linux/proc_fs.h
+++ linux-2.6.git/include/linux/proc_fs.h
@@ -253,7 +253,7 @@ extern const struct proc_ns_operations u
extern const struct proc_ns_operations ipcns_operations;
union proc_op {
- int (*proc_get_link)(struct inode *, struct path *);
+ int (*proc_get_link)(struct dentry *, struct path *);
int (*proc_read)(struct task_struct *task, char *page);
int (*proc_show)(struct seq_file *m,
struct pid_namespace *ns, struct pid *pid,
Cyrill
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