From fbda4babec842382d704eb41b2040d73ad995886 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Thu, 15 Mar 2007 02:09:39 +0100 Subject: [PATCH] maintain index over device-names to devpath relation --- udev.h | 1 + udev_db.c | 134 ++++++++++++++++++++++++++---------------------------- 2 files changed, 66 insertions(+), 69 deletions(-) diff --git a/udev.h b/udev.h index 200d7e83..7fc7fd3b 100644 --- a/udev.h +++ b/udev.h @@ -44,6 +44,7 @@ #define WRITE_END 1 #define DB_DIR ".udev/db" +#define DB_NAME_INDEX_DIR ".udev/names" struct udev_rules; diff --git a/udev_db.c b/udev_db.c index 9032eefb..c07588db 100644 --- a/udev_db.c +++ b/udev_db.c @@ -44,13 +44,46 @@ static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len return path_encode(&filename[start+1], len - (start+1)); } -static int db_file_to_devpath(const char *filename, char *devpath, size_t len) +static size_t db_file_to_devpath(const char *filename, char *devpath, size_t len) { strlcpy(devpath, "/", len); strlcat(devpath, filename, len); return path_decode(devpath); } + +/* reverse mapping from the device file name to the devpath */ +static int name_index(const char *devpath, const char *name, int add) +{ + char device[PATH_SIZE]; + char filename[PATH_SIZE * 2]; + size_t start; + int fd; + + /* directory with device name */ + strlcpy(filename, udev_root, sizeof(filename)); + start = strlcat(filename, "/"DB_NAME_INDEX_DIR"/", sizeof(filename)); + strlcat(filename, name, sizeof(filename)); + path_encode(&filename[start+1], sizeof(filename) - (start+1)); + /* entry with the devpath */ + strlcpy(device, devpath, sizeof(device)); + path_encode(&device[1], sizeof(device)-1); + strlcat(filename, device, sizeof(filename)); + + if (add) { + dbg("creating: '%s'", filename); + create_path(filename); + fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644); + if (fd > 0) + close(fd); + } else { + dbg("removing: '%s'", filename); + unlink(filename); + delete_path(filename); + } + return 0; +} + int udev_db_add_device(struct udevice *udev) { char filename[PATH_SIZE]; @@ -60,6 +93,7 @@ int udev_db_add_device(struct udevice *udev) devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); create_path(filename); + name_index(udev->dev->devpath, udev->name, 1); /* * create only a symlink with the name as the target @@ -86,8 +120,10 @@ int udev_db_add_device(struct udevice *udev) dbg("storing data for device '%s' in '%s'", udev->dev->devpath, filename); fprintf(f, "N:%s\n", udev->name); - list_for_each_entry(name_loop, &udev->symlink_list, node) + list_for_each_entry(name_loop, &udev->symlink_list, node) { fprintf(f, "S:%s\n", name_loop->name); + name_index(udev->dev->devpath, name_loop->name, 1); + } fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt)); if (udev->partitions) fprintf(f, "A:%u\n", udev->partitions); @@ -203,37 +239,42 @@ int udev_db_get_device(struct udevice *udev, const char *devpath) int udev_db_delete_device(struct udevice *udev) { char filename[PATH_SIZE]; + struct name_entry *name_loop; devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); unlink(filename); + name_index(udev->dev->devpath, udev->name, 0); + list_for_each_entry(name_loop, &udev->symlink_list, node) + name_index(udev->dev->devpath, name_loop->name, 0); + return 0; } int udev_db_lookup_name(const char *name, char *devpath, size_t len) { - char dbpath[PATH_MAX]; + char dirname[PATH_MAX]; + size_t start; DIR *dir; int found = 0; - strlcpy(dbpath, udev_root, sizeof(dbpath)); - strlcat(dbpath, "/"DB_DIR, sizeof(dbpath)); - dir = opendir(dbpath); + strlcpy(dirname, udev_root, sizeof(dirname)); + start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname)); + strlcat(dirname, name, sizeof(dirname)); + path_encode(&dirname[start+1], sizeof(dirname) - (start+1)); + + dir = opendir(dirname); if (dir == NULL) { - info("no udev_db available '%s': %s", dbpath, strerror(errno)); + info("no index directory '%s': %s", dirname, strerror(errno)); return -1; } + info("found index directory '%s'", dirname); while (!found) { struct dirent *ent; + char device[PATH_SIZE]; char filename[PATH_SIZE]; - char nodename[PATH_SIZE]; - struct stat stats; - char *bufline; - char *buf; - size_t bufsize; - size_t cur; - size_t count; + struct stat statbuf; ent = readdir(dir); if (ent == NULL || ent->d_name[0] == '\0') @@ -241,63 +282,18 @@ int udev_db_lookup_name(const char *name, char *devpath, size_t len) if (ent->d_name[0] == '.') continue; - snprintf(filename, sizeof(filename), "%s/%s", dbpath, ent->d_name); - filename[sizeof(filename)-1] = '\0'; - dbg("looking at '%s'", filename); - - if (lstat(filename, &stats) != 0) { - info("unable to read %s: %s", filename, strerror(errno)); - continue; - } - if ((stats.st_mode & S_IFMT) == S_IFLNK) { - char target[NAME_SIZE]; - int target_len; - - info("found a symlink as db file"); - target_len = readlink(filename, target, sizeof(target)); - if (target_len > 0) - target[target_len] = '\0'; - else { - info("error reading db link %s: %s", filename, strerror(errno)); - return -1; - } - dbg("db link points to '%s'", target); - if (strcmp(name, target) == 0) { - db_file_to_devpath(ent->d_name, devpath, len); - found =1; - } - continue; - } - - if (file_map(filename, &buf, &bufsize) != 0) { - info("unable to read db file '%s': %s", filename, strerror(errno)); - continue; - } + strlcpy(device, "/", len); + strlcat(device, ent->d_name, sizeof(device)); + path_decode(device); - cur = 0; - while (cur < bufsize && !found) { - count = buf_get_line(buf, bufsize, cur); - bufline = &buf[cur]; - cur += count+1; - - switch(bufline[0]) { - case 'N': - case 'S': - if (count > sizeof(nodename)) - count = sizeof(nodename); - memcpy(nodename, &bufline[2], count-2); - nodename[count-2] = '\0'; - dbg("compare '%s' '%s'", nodename, name); - if (strcmp(nodename, name) == 0) { - db_file_to_devpath(ent->d_name, devpath, len); - found = 1; - } - break; - default: - continue; - } + dbg("looking at '%s'", device); + strlcpy(filename, sysfs_path, sizeof(filename)); + strlcat(filename, device, sizeof(filename)); + if (stat(filename, &statbuf) == 0) { + strlcpy(devpath, device, len); + found = 1; + break; } - file_unmap(buf, bufsize); } closedir(dir); -- 2.39.5