diff options
Diffstat (limited to 'cmds-inspect.c')
| -rw-r--r-- | cmds-inspect.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/cmds-inspect.c b/cmds-inspect.c new file mode 100644 index 0000000..30b41fc --- /dev/null +++ b/cmds-inspect.c @@ -0,0 +1,315 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program 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, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <stdint.h> +#include <sys/ioctl.h> +#include <errno.h> + +#include "kerncompat.h" +#include "ioctl.h" +#include "utils.h" +#include "ctree.h" +#include "send-utils.h" + +#include "commands.h" +#include "btrfs-list.h" + +static const char * const inspect_cmd_group_usage[] = { + "btrfs inspect-internal <command> <args>", + NULL +}; + +static int __ino_to_path_fd(u64 inum, int fd, int verbose, const char *prepend) +{ + int ret; + int i; + struct btrfs_ioctl_ino_path_args ipa; + struct btrfs_data_container *fspath; + + fspath = malloc(4096); + if (!fspath) + return 1; + + memset(fspath, 0, sizeof(*fspath)); + ipa.inum = inum; + ipa.size = 4096; + ipa.fspath = (uintptr_t)fspath; + + ret = ioctl(fd, BTRFS_IOC_INO_PATHS, &ipa); + if (ret) { + printf("ioctl ret=%d, error: %s\n", ret, strerror(errno)); + goto out; + } + + if (verbose) + printf("ioctl ret=%d, bytes_left=%lu, bytes_missing=%lu, " + "cnt=%d, missed=%d\n", ret, + (unsigned long)fspath->bytes_left, + (unsigned long)fspath->bytes_missing, + fspath->elem_cnt, fspath->elem_missed); + + for (i = 0; i < fspath->elem_cnt; ++i) { + u64 ptr; + char *str; + ptr = (u64)(unsigned long)fspath->val; + ptr += fspath->val[i]; + str = (char *)(unsigned long)ptr; + if (prepend) + printf("%s/%s\n", prepend, str); + else + printf("%s\n", str); + } + +out: + free(fspath); + return ret; +} + +static const char * const cmd_inode_resolve_usage[] = { + "btrfs inspect-internal inode-resolve [-v] <inode> <path>", + "Get file system paths for the given inode", + NULL +}; + +static int cmd_inode_resolve(int argc, char **argv) +{ + int fd; + int verbose = 0; + int ret; + + optind = 1; + while (1) { + int c = getopt(argc, argv, "v"); + if (c < 0) + break; + + switch (c) { + case 'v': + verbose = 1; + break; + default: + usage(cmd_inode_resolve_usage); + } + } + + if (check_argc_exact(argc - optind, 2)) + usage(cmd_inode_resolve_usage); + + fd = open_file_or_dir(argv[optind+1]); + if (fd < 0) { + fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]); + return 12; + } + + ret = __ino_to_path_fd(atoll(argv[optind]), fd, verbose, + argv[optind+1]); + close(fd); + return ret; + +} + +static const char * const cmd_logical_resolve_usage[] = { + "btrfs inspect-internal logical-resolve [-Pv] [-s bufsize] <logical> <path>", + "Get file system paths for the given logical address", + "-P skip the path resolving and print the inodes instead", + "-v verbose mode", + "-s bufsize set inode container's size. This is used to increase inode", + " container's size in case it is not enough to read all the ", + " resolved results. The max value one can set is 64k", + NULL +}; + +static int cmd_logical_resolve(int argc, char **argv) +{ + int ret; + int fd; + int i; + int verbose = 0; + int getpath = 1; + int bytes_left; + struct btrfs_ioctl_logical_ino_args loi; + struct btrfs_data_container *inodes; + u64 size = 4096; + char full_path[4096]; + char *path_ptr; + + optind = 1; + while (1) { + int c = getopt(argc, argv, "Pvs:"); + if (c < 0) + break; + + switch (c) { + case 'P': + getpath = 0; + break; + case 'v': + verbose = 1; + break; + case 's': + size = atoll(optarg); + break; + default: + usage(cmd_logical_resolve_usage); + } + } + + if (check_argc_exact(argc - optind, 2)) + usage(cmd_logical_resolve_usage); + + size = min(size, (u64)64 * 1024); + inodes = malloc(size); + if (!inodes) + return 1; + + memset(inodes, 0, sizeof(*inodes)); + loi.logical = atoll(argv[optind]); + loi.size = size; + loi.inodes = (uintptr_t)inodes; + + fd = open_file_or_dir(argv[optind+1]); + if (fd < 0) { + fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]); + ret = 12; + goto out; + } + + ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi); + if (ret) { + printf("ioctl ret=%d, error: %s\n", ret, strerror(errno)); + goto out; + } + + if (verbose) + printf("ioctl ret=%d, total_size=%llu, bytes_left=%lu, " + "bytes_missing=%lu, cnt=%d, missed=%d\n", + ret, size, + (unsigned long)inodes->bytes_left, + (unsigned long)inodes->bytes_missing, + inodes->elem_cnt, inodes->elem_missed); + + bytes_left = sizeof(full_path); + ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]); + path_ptr = full_path + ret; + bytes_left -= ret + 1; + BUG_ON(bytes_left < 0); + + for (i = 0; i < inodes->elem_cnt; i += 3) { + u64 inum = inodes->val[i]; + u64 offset = inodes->val[i+1]; + u64 root = inodes->val[i+2]; + int path_fd; + char *name; + + if (getpath) { + name = btrfs_list_path_for_root(fd, root); + if (IS_ERR(name)) { + ret = PTR_ERR(name); + goto out; + } + if (!name) { + path_ptr[-1] = '\0'; + path_fd = fd; + } else { + path_ptr[-1] = '/'; + ret = snprintf(path_ptr, bytes_left, "%s", + name); + BUG_ON(ret >= bytes_left); + free(name); + path_fd = open_file_or_dir(full_path); + if (path_fd < 0) { + fprintf(stderr, "ERROR: can't access " + "'%s'\n", full_path); + goto out; + } + } + __ino_to_path_fd(inum, path_fd, verbose, full_path); + if (path_fd != fd) + close(path_fd); + } else { + printf("inode %llu offset %llu root %llu\n", inum, + offset, root); + } + } + +out: + if (fd >= 0) + close(fd); + free(inodes); + return ret; +} + +static const char * const cmd_subvolid_resolve_usage[] = { + "btrfs inspect-internal subvolid-resolve <subvolid> <path>", + "Get file system paths for the given subvolume ID.", + NULL +}; + +static int cmd_subvolid_resolve(int argc, char **argv) +{ + int ret; + int fd = -1; + u64 subvol_id; + char path[BTRFS_PATH_NAME_MAX + 1]; + + if (check_argc_exact(argc, 3)) + usage(cmd_subvolid_resolve_usage); + + fd = open_file_or_dir(argv[2]); + if (fd < 0) { + fprintf(stderr, "ERROR: can't access '%s'\n", argv[2]); + ret = -ENOENT; + goto out; + } + + subvol_id = atoll(argv[1]); + ret = btrfs_subvolid_resolve(fd, path, sizeof(path), subvol_id); + + if (ret) { + fprintf(stderr, + "%s: btrfs_subvolid_resolve(subvol_id %llu) failed with ret=%d\n", + argv[0], (unsigned long long)subvol_id, ret); + goto out; + } + + path[BTRFS_PATH_NAME_MAX] = '\0'; + printf("%s\n", path); + +out: + if (fd >= 0) + close(fd); + return ret ? 1 : 0; +} + +const struct cmd_group inspect_cmd_group = { + inspect_cmd_group_usage, NULL, { + { "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage, + NULL, 0 }, + { "logical-resolve", cmd_logical_resolve, + cmd_logical_resolve_usage, NULL, 0 }, + { "subvolid-resolve", cmd_subvolid_resolve, + cmd_subvolid_resolve_usage, NULL, 0 }, + { 0, 0, 0, 0, 0 } + } +}; + +int cmd_inspect(int argc, char **argv) +{ + return handle_command_group(&inspect_cmd_group, argc, argv); +} |