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Message-ID: <20161003004628.4865.18679.stgit@pluto.themaw.net>
Date: Mon, 03 Oct 2016 08:46:28 +0800
From: Ian Kent <raven@...maw.net>
To: Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: autofs mailing list <autofs@...r.kernel.org>,
Al Viro <viro@...IV.linux.org.uk>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
Omar Sandoval <osandov@...ndov.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [RFC PATCH 1/8] vfs - change d_manage() to take a struct path
For the autofs module to be able to reliably check if a dentry is a
mountpoint in a multiple namespace environment the ->d_manage() dentry
operation will need to take a path argument instead of a dentry.
Signed-off-by: Ian Kent <raven@...maw.net>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Omar Sandoval <osandov@...ndov.com>
---
Documentation/filesystems/Locking | 2 +-
Documentation/filesystems/vfs.txt | 2 +-
fs/autofs4/root.c | 5 +++--
fs/namei.c | 13 ++++++-------
include/linux/dcache.h | 2 +-
5 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index d30fb2c..189ea98 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -20,7 +20,7 @@ prototypes:
void (*d_iput)(struct dentry *, struct inode *);
char *(*d_dname)((struct dentry *dentry, char *buffer, int buflen);
struct vfsmount *(*d_automount)(struct path *path);
- int (*d_manage)(struct dentry *, bool);
+ int (*d_manage)(struct path *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *,
unsigned int);
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 9ace359..0035ac8 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -939,7 +939,7 @@ struct dentry_operations {
void (*d_iput)(struct dentry *, struct inode *);
char *(*d_dname)(struct dentry *, char *, int);
struct vfsmount *(*d_automount)(struct path *);
- int (*d_manage)(struct dentry *, bool);
+ int (*d_manage)(struct path *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *,
unsigned int);
};
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index fa84bb8..0705daa 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -32,7 +32,7 @@ static int autofs4_dir_open(struct inode *inode, struct file *file);
static struct dentry *autofs4_lookup(struct inode *,
struct dentry *, unsigned int);
static struct vfsmount *autofs4_d_automount(struct path *);
-static int autofs4_d_manage(struct dentry *, bool);
+static int autofs4_d_manage(struct path *, bool);
static void autofs4_dentry_release(struct dentry *);
const struct file_operations autofs4_root_operations = {
@@ -421,8 +421,9 @@ done:
return NULL;
}
-static int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
+static int autofs4_d_manage(struct path *path, bool rcu_walk)
{
+ struct dentry *dentry = path->dentry;
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct autofs_info *ino = autofs4_dentry_ino(dentry);
int status;
diff --git a/fs/namei.c b/fs/namei.c
index adb0414..e86b9d0 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1200,7 +1200,7 @@ static int follow_managed(struct path *path, struct nameidata *nd)
if (managed & DCACHE_MANAGE_TRANSIT) {
BUG_ON(!path->dentry->d_op);
BUG_ON(!path->dentry->d_op->d_manage);
- ret = path->dentry->d_op->d_manage(path->dentry, false);
+ ret = path->dentry->d_op->d_manage(path, false);
if (ret < 0)
break;
}
@@ -1263,10 +1263,10 @@ int follow_down_one(struct path *path)
}
EXPORT_SYMBOL(follow_down_one);
-static inline int managed_dentry_rcu(struct dentry *dentry)
+static inline int managed_dentry_rcu(struct path *path)
{
- return (dentry->d_flags & DCACHE_MANAGE_TRANSIT) ?
- dentry->d_op->d_manage(dentry, true) : 0;
+ return (path->dentry->d_flags & DCACHE_MANAGE_TRANSIT) ?
+ path->dentry->d_op->d_manage(path, true) : 0;
}
/*
@@ -1282,7 +1282,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
* Don't forget we might have a non-mountpoint managed dentry
* that wants to block transit.
*/
- switch (managed_dentry_rcu(path->dentry)) {
+ switch (managed_dentry_rcu(path)) {
case -ECHILD:
default:
return false;
@@ -1392,8 +1392,7 @@ int follow_down(struct path *path)
if (managed & DCACHE_MANAGE_TRANSIT) {
BUG_ON(!path->dentry->d_op);
BUG_ON(!path->dentry->d_op->d_manage);
- ret = path->dentry->d_op->d_manage(
- path->dentry, false);
+ ret = path->dentry->d_op->d_manage(path, false);
if (ret < 0)
return ret == -EISDIR ? 0 : ret;
}
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 5ff3e9a..ad2df92 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -139,7 +139,7 @@ struct dentry_operations {
void (*d_iput)(struct dentry *, struct inode *);
char *(*d_dname)(struct dentry *, char *, int);
struct vfsmount *(*d_automount)(struct path *);
- int (*d_manage)(struct dentry *, bool);
+ int (*d_manage)(struct path *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *,
unsigned int);
} ____cacheline_aligned;
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