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vfs: add helpers to get root and pwd

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Add three helpers that retrieve a refcounted copy of the root and cwd
from the supplied fs_struct.

 get_fs_root()
 get_fs_pwd()
 get_fs_root_and_pwd()

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi
2010-08-10 11:41:36 +02:00
committed by Al Viro
parent 542ce7a9bc
commit f7ad3c6be9
8 changed files with 49 additions and 62 deletions
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22
fs/proc/base.c
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@@ -149,18 +149,13 @@ static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
return count;
}
static int get_fs_path(struct task_struct *task, struct path *path, bool root)
static int get_task_root(struct task_struct *task, struct path *root)
{
struct fs_struct *fs;
int result = -ENOENT;
task_lock(task);
fs = task->fs;
if (fs) {
read_lock(&fs->lock);
*path = root ? fs->root : fs->pwd;
path_get(path);
read_unlock(&fs->lock);
if (task->fs) {
get_fs_root(task->fs, root);
result = 0;
}
task_unlock(task);
@@ -173,7 +168,12 @@ static int proc_cwd_link(struct inode *inode, struct path *path)
int result = -ENOENT;
if (task) {
result = get_fs_path(task, path, 0);
task_lock(task);
if (task->fs) {
get_fs_pwd(task->fs, path);
result = 0;
}
task_unlock(task);
put_task_struct(task);
}
return result;
@@ -185,7 +185,7 @@ static int proc_root_link(struct inode *inode, struct path *path)
int result = -ENOENT;
if (task) {
result = get_fs_path(task, path, 1);
result = get_task_root(task, path);
put_task_struct(task);
}
return result;
@@ -597,7 +597,7 @@ static int mounts_open_common(struct inode *inode, struct file *file,
get_mnt_ns(ns);
}
rcu_read_unlock();
if (ns && get_fs_path(task, &root, 1) == 0)
if (ns && get_task_root(task, &root) == 0)
ret = 0;
put_task_struct(task);
}