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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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14
fs/cachefiles/daemon.c
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@@ -552,7 +552,6 @@ static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)
*/
static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
{
struct fs_struct *fs;
struct path path;
const struct cred *saved_cred;
int ret;
@@ -573,11 +572,7 @@ static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
}
/* extract the directory dentry from the cwd */
fs = current->fs;
read_lock(&fs->lock);
path = fs->pwd;
path_get(&path);
read_unlock(&fs->lock);
get_fs_pwd(current->fs, &path);
if (!S_ISDIR(path.dentry->d_inode->i_mode))
goto notdir;
@@ -629,7 +624,6 @@ inval:
*/
static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
{
struct fs_struct *fs;
struct path path;
const struct cred *saved_cred;
int ret;
@@ -650,11 +644,7 @@ static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
}
/* extract the directory dentry from the cwd */
fs = current->fs;
read_lock(&fs->lock);
path = fs->pwd;
path_get(&path);
read_unlock(&fs->lock);
get_fs_pwd(current->fs, &path);
if (!S_ISDIR(path.dentry->d_inode->i_mode))
goto notdir;