lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[patch 2/7] vfs: mountinfo: add seq_file_root()

Browse Source 
Add a new function:

  seq_file_root()

This is similar to seq_path(), but calculates the path relative to the
given root, instead of current->fs->root.  If the path was unreachable
from root, then modify the root parameter to reflect this.

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
2008-03-27 13:06:21 +01:00
committed by Al Viro
parent 6092d04818
commit 9d1bc60138
4 changed files with 49 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
fs/dcache.c
View File

@@ -1759,10 +1759,8 @@ static int prepend(char **buffer, int *buflen, const char *str,
/**
* d_path - return the path of a dentry
* @dentry: dentry to report
* @vfsmnt: vfsmnt to which the dentry belongs
* @root: root dentry
* @rootmnt: vfsmnt to which the root dentry belongs
* @path: the dentry/vfsmount to report
* @root: root vfsmnt/dentry (may be modified by this function)
* @buffer: buffer to return value in
* @buflen: buffer length
*
@@ -1772,10 +1770,15 @@ static int prepend(char **buffer, int *buflen, const char *str,
* Returns the buffer or an error code if the path was too long.
*
* "buflen" should be positive. Caller holds the dcache_lock.
*
* If path is not reachable from the supplied root, then the value of
* root is changed (without modifying refcounts).
*/
static char *__d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
struct path *root, char *buffer, int buflen)
char *__d_path(const struct path *path, struct path *root,
char *buffer, int buflen)
{
struct dentry *dentry = path->dentry;
struct vfsmount *vfsmnt = path->mnt;
char * end = buffer+buflen;
char * retval;
@@ -1824,6 +1827,8 @@ global_root:
if (prepend(&retval, &buflen, dentry->d_name.name,
dentry->d_name.len) != 0)
goto Elong;
root->mnt = vfsmnt;
root->dentry = dentry;
return retval;
Elong:
return ERR_PTR(-ENAMETOOLONG);
@@ -1846,6 +1851,7 @@ char *d_path(struct path *path, char *buf, int buflen)
{
char *res;
struct path root;
struct path tmp;
/*
* We have various synthetic filesystems that never get mounted. On
@@ -1862,7 +1868,8 @@ char *d_path(struct path *path, char *buf, int buflen)
path_get(&root);
read_unlock(&current->fs->lock);
spin_lock(&dcache_lock);
res = __d_path(path->dentry, path->mnt, &root, buf, buflen);
tmp = root;
res = __d_path(path, &tmp, buf, buflen);
spin_unlock(&dcache_lock);
path_put(&root);
return res;
@@ -1970,9 +1977,10 @@ asmlinkage long sys_getcwd(char __user *buf, unsigned long size)
spin_lock(&dcache_lock);
if (pwd.dentry->d_parent == pwd.dentry || !d_unhashed(pwd.dentry)) {
unsigned long len;
struct path tmp = root;
char * cwd;
cwd = __d_path(pwd.dentry, pwd.mnt, &root, page, PAGE_SIZE);
cwd = __d_path(&pwd, &tmp, page, PAGE_SIZE);
spin_unlock(&dcache_lock);
error = PTR_ERR(cwd);