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https://github.com/kdave/btrfs-progs
synced 2025-02-04 20:01:51 +00:00
btrfs-progs: restore: optionally restore metadata
As long as the inode is intact, the file metadata can be restored. Directory data is restored at the end of search_dir. Errors are checked and returned, unless ignore_errors is requested. Signed-off-by: Dan Merillat <dan.merillat@gmail.com> [minor style fixes, error message updates] Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Dan Merillat
David Sterba
parent
7ab0bdd712
commit
7732e6ef62
122
cmds-restore.c
122
cmds-restore.c
@ -47,6 +47,7 @@ static char fs_name[4096];
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static char path_name[4096];
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static int get_snaps = 0;
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static int verbose = 0;
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static int restore_metadata = 0;
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static int ignore_errors = 0;
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static int overwrite = 0;
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static int get_xattrs = 0;
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@ -559,6 +560,61 @@ out:
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return ret;
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}
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static int copy_metadata(struct btrfs_root *root, int fd,
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struct btrfs_key *key)
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{
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struct btrfs_path *path;
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struct btrfs_inode_item *inode_item;
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int ret;
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path = btrfs_alloc_path();
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if (!path) {
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fprintf(stderr, "ERROR: Ran out of memory\n");
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return -ENOMEM;
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}
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ret = btrfs_lookup_inode(NULL, root, path, key, 0);
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if (ret == 0) {
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struct btrfs_timespec *bts;
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struct timespec times[2];
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inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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ret = fchown(fd, btrfs_inode_uid(path->nodes[0], inode_item),
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btrfs_inode_gid(path->nodes[0], inode_item));
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if (ret) {
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fprintf(stderr, "ERROR: Failed to change owner: %s\n",
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strerror(errno));
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goto out;
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}
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ret = fchmod(fd, btrfs_inode_mode(path->nodes[0], inode_item));
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if (ret) {
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fprintf(stderr, "ERROR: Failed to change mode: %s\n",
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strerror(errno));
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goto out;
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}
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bts = btrfs_inode_atime(inode_item);
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times[0].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
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times[0].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
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bts = btrfs_inode_mtime(inode_item);
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times[1].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
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times[1].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
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ret = futimens(fd, times);
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if (ret) {
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fprintf(stderr, "ERROR: Failed to set times: %s\n",
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strerror(errno));
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goto out;
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}
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}
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out:
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btrfs_release_path(path);
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return ret;
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}
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static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
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const char *file)
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@ -567,12 +623,15 @@ static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
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struct btrfs_path *path;
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struct btrfs_file_extent_item *fi;
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struct btrfs_inode_item *inode_item;
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struct btrfs_timespec *bts;
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struct btrfs_key found_key;
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int ret;
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int extent_type;
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int compression;
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int loops = 0;
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u64 found_size = 0;
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struct timespec times[2];
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int times_ok = 0;
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path = btrfs_alloc_path();
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if (!path) {
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@ -585,6 +644,35 @@ static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
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inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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found_size = btrfs_inode_size(path->nodes[0], inode_item);
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if (restore_metadata) {
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/*
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* Change the ownership and mode now, set times when
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* copyout is finished.
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*/
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ret = fchown(fd, btrfs_inode_uid(path->nodes[0], inode_item),
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btrfs_inode_gid(path->nodes[0], inode_item));
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if (ret && !ignore_errors) {
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btrfs_release_path(path);
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return ret;
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}
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ret = fchmod(fd, btrfs_inode_mode(path->nodes[0], inode_item));
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if (ret && !ignore_errors) {
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btrfs_release_path(path);
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return ret;
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}
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bts = btrfs_inode_atime(inode_item);
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times[0].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
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times[0].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
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bts = btrfs_inode_mtime(inode_item);
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times[1].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
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times[1].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
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times_ok = 1;
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}
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}
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btrfs_release_path(path);
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@ -692,6 +780,11 @@ set_size:
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if (ret)
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return ret;
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}
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if (restore_metadata && times_ok) {
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ret = futimens(fd, times);
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if (ret)
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return ret;
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}
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return 0;
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}
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@ -941,6 +1034,28 @@ next:
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path->slots[0]++;
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}
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if (restore_metadata) {
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snprintf(path_name, 4096, "%s%s", output_rootdir, in_dir);
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fd = open(path_name, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "ERROR: Failed to access %s to restore metadata\n",
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path_name);
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if (!ignore_errors)
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return -1;
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} else {
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/*
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* Set owner/mode/time on the directory as well
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*/
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key->type = BTRFS_INODE_ITEM_KEY;
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ret = copy_metadata(root, fd, key);
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close(fd);
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if (ret && !ignore_errors) {
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btrfs_free_path(path);
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return ret;
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}
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}
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}
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if (verbose)
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printf("Done searching %s\n", in_dir);
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btrfs_free_path(path);
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@ -1138,6 +1253,7 @@ const char * const cmd_restore_usage[] = {
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"",
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"-s get snapshots",
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"-x get extended attributes",
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"-m|--metadata restore owner, mode and times",
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"-v verbose",
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"-i ignore errors",
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"-o overwrite",
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@ -1179,10 +1295,11 @@ int cmd_restore(int argc, char **argv)
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static const struct option long_options[] = {
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{ "path-regex", required_argument, NULL, 256},
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{ "dry-run", no_argument, NULL, 'D'},
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{ "metadata", no_argument, NULL, 'm'},
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{ NULL, 0, NULL, 0}
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};
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opt = getopt_long(argc, argv, "sxviot:u:df:r:lDc", long_options,
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opt = getopt_long(argc, argv, "sxviot:u:dmf:r:lDc", long_options,
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NULL);
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if (opt < 0)
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break;
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@ -1228,6 +1345,9 @@ int cmd_restore(int argc, char **argv)
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case 'l':
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list_roots = 1;
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break;
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case 'm':
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restore_metadata = 1;
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break;
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case 'D':
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dry_run = 1;
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break;
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