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

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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
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30
fs/seq_file.c
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@@ -392,6 +392,36 @@ int seq_path(struct seq_file *m, struct path *path, char *esc)
}
EXPORT_SYMBOL(seq_path);
/*
* Same as seq_path, but relative to supplied root.
*
* root may be changed, see __d_path().
*/
int seq_path_root(struct seq_file *m, struct path *path, struct path *root,
char *esc)
{
int err = -ENAMETOOLONG;
if (m->count < m->size) {
char *s = m->buf + m->count;
char *p;
spin_lock(&dcache_lock);
p = __d_path(path, root, s, m->size - m->count);
spin_unlock(&dcache_lock);
err = PTR_ERR(p);
if (!IS_ERR(p)) {
s = mangle_path(s, p, esc);
if (s) {
p = m->buf + m->count;
m->count = s - m->buf;
return 0;
}
}
}
m->count = m->size;
return err;
}
/*
* returns the path of the 'dentry' from the root of its filesystem.
*/