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Subject[PATCH 12/13] Use struct path argument in proc_get_link()
Replace the (vfsmnt, dentry) arguments in proc_inode operation proc_get_link()
by struct path.

Also, this should eventually allow do_proc_readlink() to call d_path() with
a struct path argument.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
---
fs/proc/base.c | 60 +++++++++++++++++++++---------------------------
fs/proc/internal.h | 2 -
fs/proc/task_mmu.c | 6 ++--
fs/proc/task_nommu.c | 6 ++--
include/linux/proc_fs.h | 2 -
5 files changed, 35 insertions(+), 41 deletions(-)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -153,7 +153,7 @@ static int get_nr_threads(struct task_st
return count;
}

-static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+static int proc_cwd_link(struct inode *inode, struct path *path)
{
struct task_struct *task = get_proc_task(inode);
struct fs_struct *fs = NULL;
@@ -165,8 +165,8 @@ static int proc_cwd_link(struct inode *i
}
if (fs) {
read_lock(&fs->lock);
- *mnt = mntget(fs->pwd.mnt);
- *dentry = dget(fs->pwd.dentry);
+ *path = fs->pwd;
+ path_get(path);
read_unlock(&fs->lock);
result = 0;
put_fs_struct(fs);
@@ -174,7 +174,7 @@ static int proc_cwd_link(struct inode *i
return result;
}

-static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+static int proc_root_link(struct inode *inode, struct path *path)
{
struct task_struct *task = get_proc_task(inode);
struct fs_struct *fs = NULL;
@@ -186,8 +186,8 @@ static int proc_root_link(struct inode *
}
if (fs) {
read_lock(&fs->lock);
- *mnt = mntget(fs->root.mnt);
- *dentry = dget(fs->root.dentry);
+ *path = fs->root;
+ path_get(path);
read_unlock(&fs->lock);
result = 0;
put_fs_struct(fs);
@@ -1039,34 +1039,32 @@ 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.dentry,
- &nd->path.mnt);
+ error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
nd->last_type = LAST_BIND;
out:
return ERR_PTR(error);
}

-static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
- char __user *buffer, int buflen)
+static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
{
struct inode * inode;
char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
- char *path;
+ char *pathname;
int len;

if (!tmp)
return -ENOMEM;

- inode = dentry->d_inode;
- path = d_path(dentry, mnt, tmp, PAGE_SIZE);
- len = PTR_ERR(path);
- if (IS_ERR(path))
+ inode = path->dentry->d_inode;
+ pathname = d_path(path->dentry, path->mnt, tmp, PAGE_SIZE);
+ len = PTR_ERR(pathname);
+ if (IS_ERR(pathname))
goto out;
- len = tmp + PAGE_SIZE - 1 - path;
+ len = tmp + PAGE_SIZE - 1 - pathname;

if (len > buflen)
len = buflen;
- if (copy_to_user(buffer, path, len))
+ if (copy_to_user(buffer, pathname, len))
len = -EFAULT;
out:
free_page((unsigned long)tmp);
@@ -1077,20 +1075,18 @@ static int proc_pid_readlink(struct dent
{
int error = -EACCES;
struct inode *inode = dentry->d_inode;
- struct dentry *de;
- struct vfsmount *mnt = NULL;
+ struct path path;

/* Are we allowed to snoop on the tasks file descriptors? */
if (!proc_fd_access_allowed(inode))
goto out;

- error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
+ error = PROC_I(inode)->op.proc_get_link(inode, &path);
if (error)
goto out;

- error = do_proc_readlink(de, mnt, buffer, buflen);
- dput(de);
- mntput(mnt);
+ error = do_proc_readlink(&path, buffer, buflen);
+ path_put(&path);
out:
return error;
}
@@ -1317,8 +1313,7 @@ out:

#define PROC_FDINFO_MAX 64

-static int proc_fd_info(struct inode *inode, struct dentry **dentry,
- struct vfsmount **mnt, char *info)
+static int proc_fd_info(struct inode *inode, struct path *path, char *info)
{
struct task_struct *task = get_proc_task(inode);
struct files_struct *files = NULL;
@@ -1337,10 +1332,10 @@ static int proc_fd_info(struct inode *in
spin_lock(&files->file_lock);
file = fcheck_files(files, fd);
if (file) {
- if (mnt)
- *mnt = mntget(file->f_path.mnt);
- if (dentry)
- *dentry = dget(file->f_path.dentry);
+ if (path) {
+ *path = file->f_path;
+ path_get(path);
+ }
if (info)
snprintf(info, PROC_FDINFO_MAX,
"pos:\t%lli\n"
@@ -1357,10 +1352,9 @@ static int proc_fd_info(struct inode *in
return -ENOENT;
}

-static int proc_fd_link(struct inode *inode, struct dentry **dentry,
- struct vfsmount **mnt)
+static int proc_fd_link(struct inode *inode, struct path *path)
{
- return proc_fd_info(inode, dentry, mnt, NULL);
+ return proc_fd_info(inode, path, NULL);
}

static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
@@ -1554,7 +1548,7 @@ static ssize_t proc_fdinfo_read(struct f
size_t len, loff_t *ppos)
{
char tmp[PROC_FDINFO_MAX];
- int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, NULL, tmp);
+ int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
if (!err)
err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
return err;
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -45,7 +45,7 @@ extern int nommu_vma_show(struct seq_fil
extern int maps_protect;

extern void create_seq_entry(char *name, mode_t mode, const struct file_operations *f);
-extern int proc_exe_link(struct inode *, struct dentry **, struct vfsmount **);
+extern int proc_exe_link(struct inode *, struct path *);
extern int proc_tid_stat(struct task_struct *, char *);
extern int proc_tgid_stat(struct task_struct *, char *);
extern int proc_pid_status(struct task_struct *, char *);
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -73,7 +73,7 @@ int task_statm(struct mm_struct *mm, int
return mm->total_vm;
}

-int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+int proc_exe_link(struct inode *inode, struct path *path)
{
struct vm_area_struct * vma;
int result = -ENOENT;
@@ -96,8 +96,8 @@ int proc_exe_link(struct inode *inode, s
}

if (vma) {
- *mnt = mntget(vma->vm_file->f_path.mnt);
- *dentry = dget(vma->vm_file->f_path.dentry);
+ *path = vma->vm_file->f_path;
+ path_get(path);
result = 0;
}

--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -104,7 +104,7 @@ int task_statm(struct mm_struct *mm, int
return size;
}

-int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+int proc_exe_link(struct inode *inode, struct path *path)
{
struct vm_list_struct *vml;
struct vm_area_struct *vma;
@@ -127,8 +127,8 @@ int proc_exe_link(struct inode *inode, s
}

if (vma) {
- *mnt = mntget(vma->vm_file->f_path.mnt);
- *dentry = dget(vma->vm_file->f_path.dentry);
+ *path = vma->vm_file->f_path;
+ path_get(path);
result = 0;
}

--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -257,7 +257,7 @@ extern void kclist_add(struct kcore_list
#endif

union proc_op {
- int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
+ int (*proc_get_link)(struct inode *, struct path *);
int (*proc_read)(struct task_struct *task, char *page);
};

-
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