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authorMiklos Szeredi <mszeredi@suse.cz>2010-08-10 11:41:36 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2010-08-11 00:28:20 -0400
commitf7ad3c6be90809b53b7f0ae9d4eaa45ce2564a79 (patch)
treedc9b09188bab35320200f318b5e7b52f24dc43ad /fs/proc
parent542ce7a9bc6b3838832ae0f4f8de30c667af8ff3 (diff)
downloadlinux-f7ad3c6be90809b53b7f0ae9d4eaa45ce2564a79.tar.bz2
vfs: add helpers to get root and pwd
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>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index c806dfb24e08..4cf5abf77ddf 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -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);
}