[PATCH v7 24/49] vfs: add new "reval" argument to kern_path_create and user_path_create

Jeff Layton
2012-10-02T00:17:40Z

...for now, all of the callers pass in "false". Eventually, we'll set
that to "true" when we retry the lookup after getting back an ESTALE on
a call.

While we're at it, change the is_dir arg to a bool since that's how it's
used currently.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
arch/powerpc/platforms/cell/spufs/syscalls.c | 2 +-
drivers/base/devtmpfs.c | 7 ++++---
fs/namei.c | 23 +++++++++++++++--------
fs/ocfs2/refcounttree.c | 3 ++-
include/linux/namei.h | 4 ++--
net/unix/af_unix.c | 2 +-
6 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/arch/powerpc/platforms/cell/spufs/syscalls.c b/arch/powerpc/platforms/cell/spufs/syscalls.c
index 5b7d8ff..cb4acc7 100644
--- a/arch/powerpc/platforms/cell/spufs/syscalls.c
+++ b/arch/powerpc/platforms/cell/spufs/syscalls.c
@@ -66,7 +66,7 @@ static long do_spu_create(const char __user *pathname, unsigned int flags,
struct dentry *dentry;
int ret;

- dentry = user_path_create(AT_FDCWD, pathname, &path, 1);
+ dentry = user_path_create(AT_FDCWD, pathname, &path, true, false);
ret = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
ret = spufs_create(&path, dentry, flags, mode, neighbor);
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index deb4a45..2124437 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -148,7 +148,7 @@ static int dev_mkdir(const char *name, umode_t mode)
struct path path;
int err;

- dentry = kern_path_create(AT_FDCWD, name, &path, 1);
+ dentry = kern_path_create(AT_FDCWD, name, &path, true, false);
if (IS_ERR(dentry))
return PTR_ERR(dentry);

@@ -193,10 +193,11 @@ static int handle_create(const char *nodename, umode_t mode, struct device *dev)
struct path path;
int err;

- dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
+ dentry = kern_path_create(AT_FDCWD, nodename, &path, false, false);
if (dentry == ERR_PTR(-ENOENT)) {
create_path(nodename);
- dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
+ dentry = kern_path_create(AT_FDCWD, nodename, &path,
+ false, false);
}
if (IS_ERR(dentry))
return PTR_ERR(dentry);
diff --git a/fs/namei.c b/fs/namei.c
index d3f8998..6c75fc1 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3042,12 +3042,18 @@ struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
return file;
}

-struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path, int is_dir)
+struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path, bool is_dir, bool reval)
{
struct dentry *dentry = ERR_PTR(-EEXIST);
struct nameidata nd;
int err2;
- int error = do_path_lookup(dfd, pathname, LOOKUP_PARENT, &nd);
+ int error;
+ unsigned int lookup_flags = LOOKUP_PARENT;
+
+ if (reval)
+ lookup_flags |= LOOKUP_REVAL;
+
+ error = do_path_lookup(dfd, pathname, lookup_flags, &nd);
if (error)
return ERR_PTR(error);

@@ -3111,13 +3117,14 @@ void done_path_create(struct path *path, struct dentry *dentry)
}
EXPORT_SYMBOL(done_path_create);

-struct dentry *user_path_create(int dfd, const char __user *pathname, struct path *path, int is_dir)
+struct dentry *user_path_create(int dfd, const char __user *pathname,
+ struct path *path, bool is_dir, bool reval)
{
struct getname_info *tmp = getname(pathname);
struct dentry *res;
if (IS_ERR(tmp))
return ERR_CAST(tmp);
- res = kern_path_create(dfd, tmp->name, path, is_dir);
+ res = kern_path_create(dfd, tmp->name, path, is_dir, reval);
putname(tmp);
return res;
}
@@ -3178,7 +3185,7 @@ SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
if (error)
return error;

- dentry = user_path_create(dfd, filename, &path, 0);
+ dentry = user_path_create(dfd, filename, &path, false, false);
if (IS_ERR(dentry))
return PTR_ERR(dentry);

@@ -3240,7 +3247,7 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
struct path path;
int error;

- dentry = user_path_create(dfd, pathname, &path, 1);
+ dentry = user_path_create(dfd, pathname, &path, true, false);
if (IS_ERR(dentry))
return PTR_ERR(dentry);

@@ -3516,7 +3523,7 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
if (IS_ERR(from))
return PTR_ERR(from);

- dentry = user_path_create(newdfd, newname, &path, 0);
+ dentry = user_path_create(newdfd, newname, &path, false, false);
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto out_putname;
@@ -3616,7 +3623,7 @@ SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
if (error)
return error;

- new_dentry = user_path_create(newdfd, newname, &new_path, 0);
+ new_dentry = user_path_create(newdfd, newname, &new_path, false, false);
error = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry))
goto out;
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 30a0550..645e225 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -4453,7 +4453,8 @@ int ocfs2_reflink_ioctl(struct inode *inode,
return error;
}

- new_dentry = user_path_create(AT_FDCWD, newname, &new_path, 0);
+ new_dentry = user_path_create(AT_FDCWD, newname, &new_path,
+ false, false);
error = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry)) {
mlog_errno(error);
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 4bf19d8..2202740 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -65,8 +65,8 @@ extern int user_path_at_empty(int, const char __user *, unsigned, struct path *,

extern int kern_path(const char *, unsigned, struct path *);

-extern struct dentry *kern_path_create(int, const char *, struct path *, int);
-extern struct dentry *user_path_create(int, const char __user *, struct path *, int);
+extern struct dentry *kern_path_create(int, const char *, struct path *, bool, bool);
+extern struct dentry *user_path_create(int, const char __user *, struct path *, bool, bool);
extern void done_path_create(struct path *, struct dentry *);
extern struct dentry *kern_path_locked(const char *, struct path *);
extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index c5ee4ff..f15b0ff 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -832,7 +832,7 @@ static int unix_mknod(const char *sun_path, umode_t mode, struct path *res)
* Get the parent directory, calculate the hash for last
* component.
*/
- dentry = kern_path_create(AT_FDCWD, sun_path, &path, 0);
+ dentry = kern_path_create(AT_FDCWD, sun_path, &path, false, false);
err = PTR_ERR(dentry);
if (IS_ERR(dentry))
return err;
--
1.7.11.4