--- /dev/null
+/*
+ * Copyright (C) 2008 Sun Microssystems, Inc.
+ * Author: Rupesh Thakare <rupesh.thakare@sun.com>
+ * Author: Kalpak Shah <kalpak.shah@sun.com>
+ *
+ * This file is part of Lustre, http://www.lustre.org.
+ *
+ * Lustre is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * Lustre 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 Lustre; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * Tool for recovering objects from lost+found that might result from a
+ * Lustre OST with a corrupted directory. Running e2fsck will fix the
+ * directory, but puts all of the objects into lost+found, where they are
+ * inaccessible to Lustre.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <attr/xattr.h>
+#include <sys/stat.h>
+
+#include <liblustre.h>
+
+#define MAX_GROUPS 64
+
+int verbose = 0;
+
+struct obd_group_info {
+ int dir_exists;
+};
+struct obd_group_info grp_info[MAX_GROUPS];
+
+void usage(char *progname)
+{
+ fprintf(stderr, "Usage: %s [-hv] -d lost+found_directory\n", progname);
+ fprintf(stderr, "You need to mount the corrupted OST filesystem and"
+ "provide the path for the lost+found directory as the -d "
+ "option, for example:\n"
+ "ll_recover_lost_found_objs -d /mnt/ost/lost+found\n");
+ exit(1);
+}
+
+int mkdir_p(char *dest_path, char *mount, __u64 ff_group)
+{
+ struct stat stat_buf;
+ char tmp_path[PATH_MAX];
+ int retval;
+ mode_t mode = 0700;
+
+ if (stat(dest_path, &stat_buf) == 0)
+ return 0;
+
+ if (grp_info[ff_group].dir_exists == 0) {
+ sprintf(tmp_path, "%s/O/"LPU64, mount, ff_group);
+ if (stat(tmp_path, &stat_buf) != 0) {
+ retval = mkdir(tmp_path, 0700);
+ if (retval < 0) {
+ fprintf(stderr, "error: creating directory %s: "
+ "%s\n", tmp_path, strerror(errno));
+ return 1;
+ }
+ grp_info[ff_group].dir_exists = 1;
+ }
+ }
+
+ retval = mkdir(dest_path, mode);
+ if (retval < 0)
+ return 1;
+
+ return 0;
+}
+
+/* This is returning 0 for an error */
+__u64 read_last_id(char *file_path)
+{
+ __u64 last_id;
+ int fd;
+ int count;
+
+ fd = open(file_path, O_RDONLY);
+ if (fd < 0)
+ return 0;
+
+ count = read(fd, &last_id, sizeof(last_id));
+ if (count < 0) {
+ fprintf(stderr, "error: reading file %s: %s\n", file_path,
+ strerror(errno));
+ close(fd);
+ return 0;
+ }
+ if (count != sizeof(last_id)) {
+ fprintf(stderr, "error: Could not read full last_id from %s\n",
+ file_path);
+ close(fd);
+ return 0;
+ }
+
+ close(fd);
+ return le64_to_cpu(last_id);
+}
+
+static unsigned filetype_dir_table[] = {
+ [0]= DT_UNKNOWN,
+ [S_IFIFO]= DT_FIFO,
+ [S_IFCHR] = DT_CHR,
+ [S_IFDIR] = DT_DIR,
+ [S_IFBLK] = DT_BLK,
+ [S_IFREG] = DT_REG,
+ [S_IFLNK] = DT_LNK,
+ [S_IFSOCK]= DT_SOCK,
+#if defined(DT_DOOR) && defined(S_IFDOOR)
+ [S_IFDOOR]= DT_DOOR,
+#endif
+};
+
+static int traverse_lost_found(char *src_dir, char *mount_path)
+{
+ DIR *dir_ptr;
+ struct filter_fid trusted_fid;
+ struct dirent64 *dirent;
+ __u64 ff_group, ff_objid;
+ char file_path[PATH_MAX];
+ char dest_path[PATH_MAX];
+ char last_id_file[PATH_MAX];
+ __u64 last_id[MAX_GROUPS] = {0};
+ __u64 tmp_last_id;
+ struct stat st;
+ int obj_exists, xattr_len;
+ int len, ret = 0, error = 0;
+
+ len = strlen(src_dir);
+
+ dir_ptr = opendir(src_dir);
+ if (!dir_ptr) {
+ fprintf(stderr, "error: opening directory: %s\n",
+ strerror(errno));
+ return errno;
+ }
+
+ while ((dirent = readdir64(dir_ptr)) != NULL) {
+ if (!strcmp(dirent->d_name, ".") ||
+ !strcmp(dirent->d_name, ".."))
+ continue;
+
+ src_dir[len] = 0;
+ if ((len + dirent->d_reclen + 2) > PATH_MAX) {
+ fprintf(stderr, "error: %s: string buffer is too small",
+ __FUNCTION__);
+ break;
+ }
+ strcat(src_dir, "/");
+ strcat(src_dir, dirent->d_name);
+
+ if (dirent->d_type == DT_UNKNOWN) {
+ struct stat st;
+
+ ret = stat(src_dir, &st);
+ if (ret == 0)
+ dirent->d_type = filetype_dir_table[st.st_mode &
+ S_IFMT];
+ }
+
+ switch(dirent->d_type) {
+ case DT_DIR:
+ ret = traverse_lost_found(src_dir, mount_path);
+ if (ret)
+ goto out;
+ break;
+
+ case DT_REG:
+ sprintf(file_path, "%s", src_dir);
+ xattr_len = getxattr(file_path, "trusted.fid", (void *)&trusted_fid,
+ sizeof(trusted_fid));
+
+ if (xattr_len < 0 || xattr_len < sizeof(trusted_fid)) {
+ /*
+ * Its very much possible that we dont find fid
+ * on precreated files, LAST_ID
+ */
+ continue;
+ }
+
+ ff_group = le64_to_cpu(trusted_fid.ff_group);
+ ff_objid = le64_to_cpu(trusted_fid.ff_objid);
+
+ if (ff_group >= MAX_GROUPS) {
+ fprintf(stderr, "error: invalid group "LPU64" likely"
+ "indicates a corrupt xattr for file %s.\n",
+ ff_group, file_path);
+ continue;
+ }
+
+ /* might need to create the parent directories for this object */
+ sprintf(dest_path, "%s/O/"LPU64"/d"LPU64, mount_path, ff_group,
+ ff_objid % 32);
+
+ ret = mkdir_p(dest_path, mount_path, ff_group);
+ if (ret) {
+ fprintf(stderr, "error: creating directory %s : %s\n",
+ dest_path, strerror(errno));
+ goto out;
+ }
+
+ /*
+ * Object ID needs to be verified against last_id.
+ * LAST_ID file may not be present in the group directory
+ * due to corruption. In case of any error try to recover
+ * as many objects as possible by setting last_id to ~0ULL.
+ */
+ if (last_id[ff_group] == 0) {
+ sprintf(last_id_file, "%s/O/"LPU64"/LAST_ID",
+ mount_path, ff_group);
+ tmp_last_id = read_last_id(last_id_file);
+
+ if (tmp_last_id == 0)
+ tmp_last_id = ~0ULL;
+ last_id[ff_group] = tmp_last_id;
+ }
+
+ if (ff_objid > last_id[ff_group]) {
+ fprintf(stderr, "error: file skipped because object ID "
+ "greater than LAST_ID\nFilename: %s\n"
+ "Group: "LPU64"\nObjectid: "LPU64"\n"
+ "LAST_ID: "LPU64, file_path, ff_group, ff_objid,
+ last_id[ff_group]);
+ continue;
+ }
+
+ /* move file from lost+found to proper object directory */
+ sprintf(dest_path, "%s/O/"LPU64"/d"LPU64"/"LPU64, mount_path,
+ ff_group, ff_objid % 32, ff_objid);
+
+ obj_exists = 1;
+ ret = stat(dest_path, &st);
+ if (ret == 0) {
+ if (st.st_size == 0)
+ obj_exists = 0;
+ } else if (ret < 0 && errno == ENOENT) {
+ obj_exists = 0;
+ }
+
+ if (obj_exists) {
+ fprintf(stderr, "error: target object %s already "
+ "exists and will not be replaced.\n",dest_path);
+ continue;
+ }
+
+ if (rename(file_path, dest_path) < 0) {
+ fprintf(stderr, "error: rename failed for file %s: %s\n",
+ file_path, strerror(errno));
+ error++;
+ continue;
+ }
+
+ printf("Object %s restored.\n", dest_path);
+ break;
+
+ case DT_UNKNOWN:
+ continue;
+ }
+ }
+out:
+ if (dir_ptr)
+ closedir(dir_ptr);
+
+ return error;
+}
+
+/*
+ * If LAST_ID file is not present in some group then restore it with the highest
+ * object ID found in that group. By the time we come here all possible objects
+ * have been restored.
+ */
+int check_last_id(char *mount_path)
+{
+ char lastid_path[PATH_MAX];
+ char dirname[PATH_MAX], subdirname[PATH_MAX];
+ DIR *groupdir, *subdir;
+ struct stat st;
+ struct dirent *dirent;
+ unsigned long long group;
+ __u64 max_objid;
+ int fd;
+ int ret;
+
+ for (group = 0; group < MAX_GROUPS; group++) {
+ max_objid = 0;
+ sprintf(dirname, "%s/O/"LPU64, mount_path, group);
+
+ strcpy(lastid_path, dirname);
+ strcat(lastid_path, "/LAST_ID");
+ if (stat(lastid_path, &st) == 0)
+ continue;
+
+ groupdir = opendir(dirname);
+ if (groupdir == NULL) {
+ if (errno != ENOENT)
+ fprintf(stderr, "error: opening %s: %s\n",
+ dirname, strerror(errno));
+ continue;
+ }
+
+ while ((dirent = readdir(groupdir)) != NULL) {
+ if (!strcmp(dirent->d_name, ".") ||
+ !strcmp(dirent->d_name, ".."))
+ continue;
+
+ sprintf(subdirname, "%s/%s", dirname, dirent->d_name);
+
+ subdir = opendir(subdirname);
+ if (subdir == NULL) {
+ fprintf(stderr, "error: opening %s: %s\n",
+ subdirname, strerror(errno));
+ continue;
+ }
+
+ while ((dirent = readdir(subdir)) != NULL) {
+ __u64 objid;
+ char *end;
+
+ if (!strcmp(dirent->d_name, ".") ||
+ !strcmp(dirent->d_name, ".."))
+ continue;
+
+ objid = strtoull(dirent->d_name, &end, 0);
+ if (end == dirent->d_name || *end != 0) {
+ fprintf(stderr, "error: unknown object"
+ "ID %s/%s\n", subdirname,
+ dirent->d_name);
+ continue;
+ }
+ if (objid > max_objid)
+ max_objid = objid;
+ }
+ closedir(subdir);
+ }
+ closedir(groupdir);
+
+ fd = open(lastid_path, O_RDWR | O_CREAT, 0700);
+ if (fd < 0) {
+ fprintf(stderr, "error: open \"%s\" failed: %s\n",
+ lastid_path, strerror(errno));
+ close(fd);
+ return -errno;
+ }
+
+ ret = write(fd, &max_objid, sizeof(__u64));
+ if (ret < sizeof(__u64)) {
+ close(fd);
+ return errno;
+ }
+
+ close(fd);
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ char *progname;
+ char *src_dir = NULL, *last_dir = NULL;
+ struct stat stat_buf;
+ char tmp_path[PATH_MAX];
+ char mount_path[PATH_MAX] = {0};
+ char c;
+ int retval;
+
+ progname = argv[0];
+
+ while ((c = getopt(argc, argv, "d:hv")) != EOF) {
+ switch (c) {
+ case 'd':
+ src_dir = optarg;
+ /* Trim last '/' */
+ last_dir = strrchr(src_dir, '/');
+ if (last_dir != strchr(src_dir, '/')) {
+ if (last_dir != NULL && (*(last_dir + 1) == '\0'))
+ *(last_dir) = '\0';
+ }
+ fprintf(stdout, "\"lost+found\" directory path: %s\n",
+ src_dir);
+ break;
+ case 'v':
+ verbose = 1;
+ break;
+ case 'h':
+ usage(progname);
+ default:
+ fprintf(stderr, "%s: bad option '%c'\n",
+ progname, c);
+ usage(progname);
+ }
+ }
+
+ if (src_dir == NULL)
+ usage(progname);
+
+ last_dir = strrchr(src_dir, '/');
+ if (last_dir == NULL) {
+ /* Current directory */
+ strcpy(mount_path, src_dir);
+ strcat(mount_path, "/..");
+ } else {
+ strncpy(mount_path, src_dir, (int)(last_dir - src_dir));
+ }
+
+ /* Check if 'O' directory exists and create it if needed */
+ sprintf(tmp_path, "%s/O", mount_path);
+ if (stat(tmp_path, &stat_buf) != 0) {
+ retval = mkdir(tmp_path, 0700);
+ if (retval < 0)
+ fprintf(stderr, "error: creating objects directory %s:"
+ " %s\n", tmp_path, strerror(errno));
+ return errno;
+ }
+
+ memset(grp_info, 0, MAX_GROUPS * sizeof(struct obd_group_info));
+
+ retval = traverse_lost_found(src_dir, mount_path);
+ if (retval) {
+ fprintf(stderr, "error: traversing lost+found looking for "
+ "orphan objects.\n");
+ return retval;
+ }
+
+ retval = check_last_id(mount_path);
+ if (retval)
+ fprintf(stderr, "error: while checking/restoring LAST_ID.\n");
+
+ return retval;
+}
git://git.whamcloud.com / fs / lustre-release.git / commitdiff