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/*
Copyright (c) 2006, 2007, 2008 Z RESEARCH, Inc. <http://www.zresearch.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include "glusterfs.h"
#include "xlator.h"
#include "meta.h"
static int
is_meta_path (const char *path)
{
while (*path == '/')
path++;
if (!strncmp (path, ".meta", strlen (".meta")))
return 1;
return 0;
}
struct stat *
new_stbuf (void)
{
static int next_inode = 0;
struct stat *stbuf = CALLOC (1, sizeof (struct stat));
ERR_ABORT (stbuf);
stbuf->st_dev = 0;
stbuf->st_ino = next_inode++;
stbuf->st_mode = S_IRUSR | S_IRGRP | S_IROTH;
stbuf->st_nlink = 1;
stbuf->st_uid = 0;
stbuf->st_gid = 0;
stbuf->st_rdev = 0;
stbuf->st_size = 0;
stbuf->st_blksize = 0;
stbuf->st_blocks = 0;
stbuf->st_atime = time (NULL);
stbuf->st_atim.tv_nsec = 0;
stbuf->st_mtime = stbuf->st_atime;
stbuf->st_mtim.tv_nsec = 0;
stbuf->st_ctime = stbuf->st_ctime;
stbuf->st_ctim.tv_nsec = 0;
return stbuf;
}
/* find an entry among the siblings of an entry */
static meta_dirent_t *
find_entry (meta_dirent_t *node, const char *dir)
{
meta_dirent_t *trav = node;
while (trav) {
if (!strcmp (trav->name, dir))
return trav;
trav = trav->next;
}
return NULL;
}
/*
* Return the meta_dirent_t corresponding to the pathname.
*
* If pathname does not exist in the meta tree, try to return
* its highest parent that does exist. The part of the
* pathname that is left over is returned in the value-result
* variable {remain}.
* For example, for "/.meta/xlators/brick1/view/foo/bar/baz",
* return the entry for "/.meta/xlators/brick1/view"
* and set remain to "/bar/baz"
*/
meta_dirent_t *
lookup_meta_entry (meta_dirent_t *root, const char *path,
char **remain)
{
char *_path = strdup (path);
if (!is_meta_path (path))
return NULL;
meta_dirent_t *trav = root;
char *dir = strtok (_path, "/");
dir = strtok (NULL, "/");
while (dir) {
meta_dirent_t *ntrav;
ntrav = find_entry (trav->children, dir);
if (!ntrav) {
/* we have reached bottom of the meta tree.
Unknown dragons lie further below */
if (remain) {
char *piece = dir;
while (piece) {
char *tmp = *remain;
if (*remain)
asprintf (remain, "/%s/%s", *remain, piece);
else
asprintf (remain, "/%s", piece);
if (tmp) free (tmp);
piece = strtok (NULL, "/");
}
}
return trav;
}
dir = strtok (NULL, "/");
trav = ntrav;
}
free (_path);
return trav;
}
meta_dirent_t *
insert_meta_entry (meta_dirent_t *root, const char *path,
int type, struct stat *stbuf, struct xlator_fops *fops)
{
if (!is_meta_path (path))
return NULL;
char *slashpos = strrchr (path, '/');
char *dir = strndup (path, slashpos - path);
meta_dirent_t *parent = lookup_meta_entry (root, dir, NULL);
if (!dir)
return NULL;
meta_dirent_t *new = CALLOC (1, sizeof (meta_dirent_t));
ERR_ABORT (new);
new->name = strdup (slashpos+1);
new->type = type;
new->parent = parent;
new->next = parent->children;
parent->children = new;
if (stbuf)
new->stbuf = stbuf;
else
new->stbuf = new_stbuf ();
new->stbuf->st_mode |= type;
new->fops = fops;
return new;
}
int main (void)
{
meta_dirent_t *root = CALLOC (1, sizeof (meta_dirent_t));
ERR_ABORT (root);
root->name = strdup (".meta");
insert_meta_entry (root, "/.meta/version", S_IFREG, NULL, NULL);
return 0;
}
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