From e494f5790fcbe401b4b0d171ae5575991670b790 Mon Sep 17 00:00:00 2001 From: Anand Jain Date: Mon, 21 Mar 2016 15:21:04 +0800 Subject: [PATCH] btrfs-progs: create get_subvol_info() get_subvol_info() is useful as we are adding more features around subvolume. This function was inline with the function cmd_subvol_show(). Signed-off-by: Anand Jain Signed-off-by: David Sterba --- cmds-subvolume.c | 80 ++++++++++++++++++-------------------------------------- utils.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++ utils.h | 2 ++ 3 files changed, 100 insertions(+), 55 deletions(-) diff --git a/cmds-subvolume.c b/cmds-subvolume.c index f62ab95..2319684 100644 --- a/cmds-subvolume.c +++ b/cmds-subvolume.c @@ -908,21 +908,21 @@ static const char * const cmd_subvol_show_usage[] = { static int cmd_subvol_show(int argc, char **argv) { struct root_info get_ri; - struct btrfs_list_filter_set *filter_set; + struct btrfs_list_filter_set *filter_set = NULL; char tstr[256]; char uuidparse[BTRFS_UUID_UNPARSED_SIZE]; - char *fullpath = NULL, *svpath = NULL, *mnt = NULL; + char *fullpath = NULL; char raw_prefix[] = "\t\t\t\t"; - u64 sv_id; - int fd = -1, mntfd = -1; + int fd = -1; int ret = 1; - DIR *dirstream1 = NULL, *dirstream2 = NULL; + DIR *dirstream1 = NULL; clean_args_no_options(argc, argv, cmd_subvol_show_usage); if (check_argc_exact(argc - optind, 1)) usage(cmd_subvol_show_usage); + memset(&get_ri, 0, sizeof(get_ri)); fullpath = realpath(argv[optind], NULL); if (!fullpath) { error("cannot find real path for '%s': %s", @@ -930,57 +930,23 @@ static int cmd_subvol_show(int argc, char **argv) goto out; } - ret = test_issubvolume(fullpath); - if (ret < 0) { - error("cannot access subvolume %s: %s", fullpath, - strerror(-ret)); - goto out; - } - if (!ret) { - error("not a subvolume: %s", fullpath); - ret = 1; - goto out; - } - - ret = find_mount_root(fullpath, &mnt); - if (ret < 0) { - error("find_mount_root failed on '%s': %s", - fullpath, strerror(-ret)); - goto out; - } - if (ret > 0) { - error("%s doesn't belong to btrfs mount point", fullpath); - goto out; - } - ret = 1; - svpath = get_subvol_name(mnt, fullpath); - - fd = btrfs_open_dir(fullpath, &dirstream1, 1); - if (fd < 0) - goto out; - - ret = btrfs_list_get_path_rootid(fd, &sv_id); - if (ret) { - error("can't get rootid for '%s'", fullpath); - goto out; - } - - mntfd = btrfs_open_dir(mnt, &dirstream2, 1); - if (mntfd < 0) - goto out; - - if (sv_id == BTRFS_FS_TREE_OBJECTID) { + ret = get_subvol_info(fullpath, &get_ri); + if (ret == 2) { + /* + * Since the top level btrfs was given don't + * take that as error + */ printf("%s is toplevel subvolume\n", fullpath); + ret = 0; goto out; } - - memset(&get_ri, 0, sizeof(get_ri)); - get_ri.root_id = sv_id; - - ret = btrfs_get_subvol(mntfd, &get_ri); if (ret) { - error("can't find '%s'", svpath); - goto out; + ret < 0 ? + error("Failed to get subvol info %s: %s\n", + fullpath, strerror(-ret)): + error("Failed to get subvol info %s: %d\n", + fullpath, ret); + return ret; } /* print the info */ @@ -1031,19 +997,23 @@ static int cmd_subvol_show(int argc, char **argv) btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_BY_PARENT, (u64)(unsigned long)get_ri.uuid); btrfs_list_setup_print_column(BTRFS_LIST_PATH); + + fd = open_file_or_dir(fullpath, &dirstream1); + if (fd < 0) { + fprintf(stderr, "ERROR: can't access '%s'\n", fullpath); + goto out; + } btrfs_list_subvols_print(fd, filter_set, NULL, BTRFS_LIST_LAYOUT_RAW, 1, raw_prefix); +out: /* clean up */ free(get_ri.path); free(get_ri.name); free(get_ri.full_path); btrfs_list_free_filter_set(filter_set); -out: close_file_or_dir(fd, dirstream1); - close_file_or_dir(mntfd, dirstream2); - free(mnt); free(fullpath); return !!ret; } diff --git a/utils.c b/utils.c index cd3234e..dd2ff9c 100644 --- a/utils.c +++ b/utils.c @@ -3171,3 +3171,76 @@ char *get_subvol_name(char *mnt, char *full_path) return full_path + len; } + +/* + * Returns + * <0: Std error + * 0: All fine + * 1: Error; and error info printed to the terminal. Fixme. + * 2: If the fullpath is root tree instead of subvol tree + */ +int get_subvol_info(char *fullpath, struct root_info *get_ri) +{ + u64 sv_id; + int ret = 1; + int fd = -1; + int mntfd = -1; + char *mnt = NULL; + char *svpath = NULL; + DIR *dirstream1 = NULL; + DIR *dirstream2 = NULL; + + ret = test_issubvolume(fullpath); + if (ret < 0) + return ret; + if (!ret) { + error("not a subvolume: %s", fullpath); + return 1; + } + + ret = find_mount_root(fullpath, &mnt); + if (ret < 0) + return ret; + if (ret > 0) { + error("%s doesn't belong to btrfs mount point", fullpath); + return 1; + } + ret = 1; + svpath = get_subvol_name(mnt, fullpath); + + fd = btrfs_open_dir(fullpath, &dirstream1, 1); + if (fd < 0) + goto out; + + ret = btrfs_list_get_path_rootid(fd, &sv_id); + if (ret) { + error("can't get rootid for '%s'", fullpath); + goto out; + } + + mntfd = btrfs_open_dir(mnt, &dirstream2, 1); + if (mntfd < 0) + goto out; + + if (sv_id == BTRFS_FS_TREE_OBJECTID) { + ret = 2; + /* + * So that caller may decide if thats an error or just fine. + */ + goto out; + } + + memset(get_ri, 0, sizeof(*get_ri)); + get_ri->root_id = sv_id; + + ret = btrfs_get_subvol(mntfd, get_ri); + if (ret) + error("can't find '%s': %d", svpath, ret); + +out: + close_file_or_dir(mntfd, dirstream2); + close_file_or_dir(mntfd, dirstream1); + free(mnt); + + return ret; +} diff --git a/utils.h b/utils.h index c6395b0..09bd3b3 100644 --- a/utils.h +++ b/utils.h @@ -24,6 +24,7 @@ #include #include #include "internal.h" +#include "btrfs-list.h" #define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024) #define BTRFS_MKFS_SMALL_VOLUME_SIZE (1024 * 1024 * 1024) @@ -198,6 +199,7 @@ int test_issubvolume(const char *path); int test_isdir(const char *path); char *get_subvol_name(char *mnt, char *full_path); +int get_subvol_info(char *fullpath, struct root_info *get_ri); /* * Btrfs minimum size calculation is complicated, it should include at least: -- 2.7.4