* Userspace devfs
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
- * Copyright (C) 2003 IBM Corp.
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
*
*/
-/*
- * udev database library
- */
+
#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
+#include <stddef.h>
#include <fcntl.h>
#include <string.h>
-#include <sys/stat.h>
#include <errno.h>
-#include <signal.h>
+#include <dirent.h>
-#include "udev_version.h"
+#include "libsysfs/sysfs/libsysfs.h"
#include "udev.h"
-#include "namedev.h"
+#include "udev_lib.h"
+#include "logging.h"
#include "udevdb.h"
-#include "tdb/tdb.h"
-#include "libsysfs/libsysfs.h"
-
-static TDB_CONTEXT *udevdb;
+#define PATH_TO_NAME_CHAR '@'
-int udevdb_add_dev(const char *path, const struct udevice *dev)
+static int get_db_filename(struct udevice *udev, char *filename, int len)
{
- TDB_DATA key, data;
- char keystr[SYSFS_PATH_MAX];
-
- if ((path == NULL) || (dev == NULL))
- return -ENODEV;
-
- memset(keystr, 0, NAME_SIZE);
- strcpy(keystr, path);
- key.dptr = keystr;
- key.dsize = strlen(keystr) + 1;
+ char devpath[SYSFS_PATH_MAX];
+ char *pos;
+
+ /* replace '/' to transform path into a filename */
+ strfieldcpy(devpath, udev->devpath);
+ pos = strchr(&devpath[1], '/');
+ while (pos) {
+ pos[0] = PATH_TO_NAME_CHAR;
+ pos = strchr(&pos[1], '/');
+ }
+ snprintf(filename, len-1, "%s%s", udev_db_path, devpath);
+ filename[len-1] = '\0';
- data.dptr = (void *)dev;
- data.dsize = sizeof(*dev);
-
- return tdb_store(udevdb, key, data, TDB_REPLACE);
+ return 0;
}
-struct udevice *udevdb_get_dev(const char *path)
+int udevdb_add_dev(struct udevice *udev)
{
- TDB_DATA key, data;
- struct udevice *dev;
+ char filename[SYSFS_PATH_MAX];
+ FILE *f;
+
+ if (udev->test_run)
+ return 0;
- if (path == NULL)
- return NULL;
+ get_db_filename(udev, filename, SYSFS_PATH_MAX);
- key.dptr = (void *)path;
- key.dsize = strlen(path) + 1;
+ create_path(filename);
- data = tdb_fetch(udevdb, key);
- if (data.dptr == NULL || data.dsize == 0)
- return NULL;
+ f = fopen(filename, "w");
+ if (f == NULL) {
+ dbg("unable to create db file '%s'", filename);
+ return -1;
+ }
+ dbg("storing data for device '%s' in '%s'", udev->devpath, filename);
+
+ fprintf(f, "P:%s\n", udev->devpath);
+ fprintf(f, "N:%s\n", udev->name);
+ fprintf(f, "S:%s\n", udev->symlink);
+ fprintf(f, "A:%d\n", udev->partitions);
- dev = malloc(sizeof(*dev));
- if (dev == NULL)
- goto exit;
+ fclose(f);
- memcpy(dev, data.dptr, sizeof(*dev));
-exit:
- free(data.dptr);
- return dev;
+ return 0;
}
-int udevdb_delete_dev(const char *path)
+static int parse_db_file(struct udevice *udev, const char *filename)
{
- TDB_DATA key;
- char keystr[SYSFS_PATH_MAX];
+ char line[NAME_SIZE];
+ char *bufline;
+ char *buf;
+ size_t bufsize;
+ size_t cur;
+ size_t count;
+
+ if (file_map(filename, &buf, &bufsize) != 0) {
+ dbg("unable to read db file '%s'", filename);
+ return -1;
+ }
+
+ cur = 0;
+ while (cur < bufsize) {
+ count = buf_get_line(buf, bufsize, cur);
+ bufline = &buf[cur];
+ cur += count+1;
+
+ switch(bufline[0]) {
+ case 'P':
+ if (count > DEVPATH_SIZE)
+ count = DEVPATH_SIZE-1;
+ strncpy(udev->devpath, &bufline[2], count-2);
+ break;
+ case 'N':
+ if (count > NAME_SIZE)
+ count = NAME_SIZE-1;
+ strncpy(udev->name, &bufline[2], count-2);
+ break;
+ case 'S':
+ if (count > NAME_SIZE)
+ count = NAME_SIZE-1;
+ strncpy(udev->symlink, &bufline[2], count-2);
+ break;
+ case 'A':
+ strfieldcpy(line, &bufline[2]);
+ udev->partitions = atoi(line);
+ break;
+ }
+ }
- if (path == NULL)
- return -EINVAL;
+ if (udev->name[0] == '\0')
+ return -1;
- memset(keystr, 0, sizeof(keystr));
- strcpy(keystr, path);
+ return 0;
+}
+
+int udevdb_get_dev(struct udevice *udev)
+{
+ char filename[SYSFS_PATH_MAX];
- key.dptr = keystr;
- key.dsize = strlen(keystr) + 1;
+ get_db_filename(udev, filename, SYSFS_PATH_MAX);
- return tdb_delete(udevdb, key);
+ return parse_db_file(udev, filename);
}
-/**
- * udevdb_exit: closes database
- */
-void udevdb_exit(void)
+int udevdb_delete_dev(struct udevice *udev)
{
- if (udevdb != NULL) {
- tdb_close(udevdb);
- udevdb = NULL;
- }
+ char filename[SYSFS_PATH_MAX];
+
+ get_db_filename(udev, filename, SYSFS_PATH_MAX);
+ unlink(filename);
+
+ return 0;
}
-/**
- * udevdb_init: initializes database
- * @init_flag: UDEVDB_INTERNAL - database stays in memory
- * UDEVDB_DEFAULT - database is written to a file
- */
-int udevdb_init(int init_flag)
+int udevdb_get_dev_byname(struct udevice *udev, const char *name)
{
- if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL)
- return -EINVAL;
-
- udevdb = tdb_open(udev_db_filename, 0, init_flag, O_RDWR | O_CREAT, 0644);
- if (udevdb == NULL) {
- if (init_flag == UDEVDB_INTERNAL)
- dbg("unable to initialize in-memory database");
- else
- dbg("unable to initialize database at '%s'", udev_db_filename);
- return -EINVAL;
+ struct dirent *ent;
+ DIR *dir;
+ char filename[NAME_SIZE];
+ struct udevice db_udev;
+
+ dir = opendir(udev_db_path);
+ if (dir == NULL) {
+ dbg("unable to udev db '%s'", udev_db_path);
+ return -1;
+ }
+
+ while (1) {
+ ent = readdir(dir);
+ if (ent == NULL || ent->d_name[0] == '\0')
+ break;
+
+ if (ent->d_name[0] == '.')
+ continue;
+
+ snprintf(filename, NAME_SIZE-1, "%s/%s", udev_db_path, ent->d_name);
+ filename[NAME_SIZE-1] = '\0';
+
+ memset(&db_udev, 0x00, sizeof(struct udevice));
+ if (parse_db_file(&db_udev, filename) == 0) {
+ char *pos;
+ int len;
+
+ if (strncmp(name, db_udev.name, NAME_SIZE) == 0) {
+ goto found;
+ }
+
+ foreach_strpart(db_udev.symlink, " ", pos, len) {
+ if (strncmp(name, pos, len) != 0)
+ continue;
+
+ if (len == strlen(name))
+ goto found;
+ }
+
+ }
}
+
+ closedir(dir);
+
+ return -1;
+
+found:
+ closedir(dir);
+
+ strfieldcpy(udev->devpath, db_udev.devpath);
+ strfieldcpy(udev->name, db_udev.name);
+ strfieldcpy(udev->symlink, db_udev.symlink);
+ udev->partitions = db_udev.partitions;
+
return 0;
}
~ianmdlvl / elogind.git / blobdiff