#include <stdint.h>
#include <sys/ioctl.h>
#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
#include "kerncompat.h"
#include "ioctl.h"
#include "utils.h"
#include "ctree.h"
#include "send-utils.h"
-
+#include "disk-io.h"
#include "commands.h"
#include "btrfs-list.h"
+#include "help.h"
static const char * const inspect_cmd_group_usage[] = {
"btrfs inspect-internal <command> <args>",
int ret;
int i;
struct btrfs_ioctl_ino_path_args ipa;
- struct btrfs_data_container *fspath;
-
- fspath = malloc(4096);
- if (!fspath)
- return -ENOMEM;
+ struct btrfs_data_container fspath[PATH_MAX];
memset(fspath, 0, sizeof(*fspath));
ipa.inum = inum;
- ipa.size = 4096;
+ ipa.size = PATH_MAX;
ipa.fspath = ptr_to_u64(fspath);
ret = ioctl(fd, BTRFS_IOC_INO_PATHS, &ipa);
- if (ret) {
- printf("ioctl ret=%d, error: %s\n", ret, strerror(errno));
+ if (ret < 0) {
+ error("ino paths ioctl: %m");
goto out;
}
}
out:
- free(fspath);
return !!ret;
}
-static const char * const cmd_inode_resolve_usage[] = {
+static const char * const cmd_inspect_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)
+static int cmd_inspect_inode_resolve(int argc, char **argv)
{
int fd;
int verbose = 0;
int ret;
DIR *dirstream = NULL;
- optind = 1;
while (1) {
int c = getopt(argc, argv, "v");
if (c < 0)
verbose = 1;
break;
default:
- usage(cmd_inode_resolve_usage);
+ usage(cmd_inspect_inode_resolve_usage);
}
}
if (check_argc_exact(argc - optind, 2))
- usage(cmd_inode_resolve_usage);
+ usage(cmd_inspect_inode_resolve_usage);
- fd = open_file_or_dir(argv[optind+1], &dirstream);
- if (fd < 0) {
- fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
+ fd = btrfs_open_dir(argv[optind + 1], &dirstream, 1);
+ if (fd < 0)
return 1;
- }
ret = __ino_to_path_fd(arg_strtou64(argv[optind]), fd, verbose,
argv[optind+1]);
}
-static const char * const cmd_logical_resolve_usage[] = {
+static const char * const cmd_inspect_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",
NULL
};
-static int cmd_logical_resolve(int argc, char **argv)
+static int cmd_inspect_logical_resolve(int argc, char **argv)
{
int ret;
int fd;
struct btrfs_ioctl_logical_ino_args loi;
struct btrfs_data_container *inodes;
u64 size = 4096;
- char full_path[4096];
+ char full_path[PATH_MAX];
char *path_ptr;
DIR *dirstream = NULL;
- optind = 1;
while (1) {
int c = getopt(argc, argv, "Pvs:");
if (c < 0)
size = arg_strtou64(optarg);
break;
default:
- usage(cmd_logical_resolve_usage);
+ usage(cmd_inspect_logical_resolve_usage);
}
}
if (check_argc_exact(argc - optind, 2))
- usage(cmd_logical_resolve_usage);
+ usage(cmd_inspect_logical_resolve_usage);
- size = min(size, (u64)64 * 1024);
+ size = min(size, (u64)SZ_64K);
inodes = malloc(size);
if (!inodes)
return 1;
loi.size = size;
loi.inodes = ptr_to_u64(inodes);
- fd = open_file_or_dir(argv[optind+1], &dirstream);
+ fd = btrfs_open_dir(argv[optind + 1], &dirstream, 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));
+ if (ret < 0) {
+ error("logical ino ioctl: %m");
goto out;
}
ret = snprintf(full_path, bytes_left, "%s/", argv[optind+1]);
path_ptr = full_path + ret;
bytes_left -= ret + 1;
- BUG_ON(bytes_left < 0);
+ if (bytes_left < 0) {
+ error("path buffer too small: %d bytes", bytes_left);
+ goto out;
+ }
for (i = 0; i < inodes->elem_cnt; i += 3) {
u64 inum = inodes->val[i];
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, &dirs);
+ if (ret >= bytes_left) {
+ error("path buffer too small: %d bytes",
+ bytes_left - ret);
+ goto out;
+ }
+ path_fd = btrfs_open_dir(full_path, &dirs, 1);
if (path_fd < 0) {
- fprintf(stderr, "ERROR: can't access "
- "'%s'\n", full_path);
+ ret = -ENOENT;
goto out;
}
}
return !!ret;
}
-static const char * const cmd_subvolid_resolve_usage[] = {
+static const char * const cmd_inspect_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)
+static int cmd_inspect_subvolid_resolve(int argc, char **argv)
{
int ret;
int fd = -1;
u64 subvol_id;
- char path[BTRFS_PATH_NAME_MAX + 1];
+ char path[PATH_MAX];
DIR *dirstream = NULL;
- if (check_argc_exact(argc, 3))
- usage(cmd_subvolid_resolve_usage);
+ clean_args_no_options(argc, argv, cmd_inspect_subvolid_resolve_usage);
- fd = open_file_or_dir(argv[2], &dirstream);
+ if (check_argc_exact(argc - optind, 2))
+ usage(cmd_inspect_subvolid_resolve_usage);
+
+ fd = btrfs_open_dir(argv[optind + 1], &dirstream, 1);
if (fd < 0) {
- fprintf(stderr, "ERROR: can't access '%s'\n", argv[2]);
ret = -ENOENT;
goto out;
}
- subvol_id = arg_strtou64(argv[1]);
+ subvol_id = arg_strtou64(argv[optind]);
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);
+ error("resolving subvolid %llu error %d",
+ (unsigned long long)subvol_id, ret);
goto out;
}
- path[BTRFS_PATH_NAME_MAX] = '\0';
+ path[PATH_MAX - 1] = '\0';
printf("%s\n", path);
out:
close_file_or_dir(fd, dirstream);
- return ret ? 1 : 0;
+ return !!ret;
}
-static const char* const cmd_rootid_usage[] = {
+static const char* const cmd_inspect_rootid_usage[] = {
"btrfs inspect-internal rootid <path>",
"Get tree ID of the containing subvolume of path.",
NULL
};
-static int cmd_rootid(int argc, char **argv)
+static int cmd_inspect_rootid(int argc, char **argv)
{
int ret;
int fd = -1;
u64 rootid;
DIR *dirstream = NULL;
- if (check_argc_exact(argc, 2))
- usage(cmd_rootid_usage);
+ clean_args_no_options(argc, argv, cmd_inspect_rootid_usage);
- fd = open_file_or_dir(argv[1], &dirstream);
+ if (check_argc_exact(argc - optind, 1))
+ usage(cmd_inspect_rootid_usage);
+
+ fd = btrfs_open_file_or_dir(argv[optind], &dirstream, 1);
if (fd < 0) {
- fprintf(stderr, "ERROR: can't access '%s'\n", argv[1]);
ret = -ENOENT;
goto out;
}
- ret = lookup_ino_rootid(fd, &rootid);
+ ret = lookup_path_rootid(fd, &rootid);
if (ret) {
- fprintf(stderr, "%s: rootid failed with ret=%d\n",
- argv[0], ret);
+ error("failed to lookup root id: %s", strerror(-ret));
goto out;
}
return !!ret;
}
+static const char* const cmd_inspect_min_dev_size_usage[] = {
+ "btrfs inspect-internal min-dev-size [options] <path>",
+ "Get the minimum size the device can be shrunk to. The",
+ "device id 1 is used by default.",
+ "--id DEVID specify the device id to query",
+ NULL
+};
+
+struct dev_extent_elem {
+ u64 start;
+ /* inclusive end */
+ u64 end;
+ struct list_head list;
+};
+
+static int add_dev_extent(struct list_head *list,
+ const u64 start, const u64 end,
+ const int append)
+{
+ struct dev_extent_elem *e;
+
+ e = malloc(sizeof(*e));
+ if (!e)
+ return -ENOMEM;
+
+ e->start = start;
+ e->end = end;
+
+ if (append)
+ list_add_tail(&e->list, list);
+ else
+ list_add(&e->list, list);
+
+ return 0;
+}
+
+static void free_dev_extent_list(struct list_head *list)
+{
+ while (!list_empty(list)) {
+ struct dev_extent_elem *e;
+
+ e = list_first_entry(list, struct dev_extent_elem, list);
+ list_del(&e->list);
+ free(e);
+ }
+}
+
+static int hole_includes_sb_mirror(const u64 start, const u64 end)
+{
+ int i;
+ int ret = 0;
+
+ for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+ u64 bytenr = btrfs_sb_offset(i);
+
+ if (bytenr >= start && bytenr <= end) {
+ ret = 1;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void adjust_dev_min_size(struct list_head *extents,
+ struct list_head *holes,
+ u64 *min_size)
+{
+ /*
+ * If relocation of the block group of a device extent must happen (see
+ * below) scratch space is used for the relocation. So track here the
+ * size of the largest device extent that has to be relocated. We track
+ * only the largest and not the sum of the sizes of all relocated block
+ * groups because after each block group is relocated the running
+ * transaction is committed so that pinned space is released.
+ */
+ u64 scratch_space = 0;
+
+ /*
+ * List of device extents is sorted by descending order of the extent's
+ * end offset. If some extent goes beyond the computed minimum size,
+ * which initially matches the sum of the lengths of all extents,
+ * we need to check if the extent can be relocated to an hole in the
+ * device between [0, *min_size[ (which is what the resize ioctl does).
+ */
+ while (!list_empty(extents)) {
+ struct dev_extent_elem *e;
+ struct dev_extent_elem *h;
+ int found = 0;
+ u64 extent_len;
+ u64 hole_len = 0;
+
+ e = list_first_entry(extents, struct dev_extent_elem, list);
+ if (e->end <= *min_size)
+ break;
+
+ /*
+ * Our extent goes beyond the computed *min_size. See if we can
+ * find a hole large enough to relocate it to. If not we must stop
+ * and set *min_size to the end of the extent.
+ */
+ extent_len = e->end - e->start + 1;
+ list_for_each_entry(h, holes, list) {
+ hole_len = h->end - h->start + 1;
+ if (hole_len >= extent_len) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ *min_size = e->end + 1;
+ break;
+ }
+
+ /*
+ * If the hole found contains the location for a superblock
+ * mirror, we are pessimistic and require allocating one
+ * more extent of the same size. This is because the block
+ * group could be in the worst case used by a single extent
+ * with a size >= (block_group.length - superblock.size).
+ */
+ if (hole_includes_sb_mirror(h->start,
+ h->start + extent_len - 1))
+ *min_size += extent_len;
+
+ if (hole_len > extent_len) {
+ h->start += extent_len;
+ } else {
+ list_del(&h->list);
+ free(h);
+ }
+
+ list_del(&e->list);
+ free(e);
+
+ if (extent_len > scratch_space)
+ scratch_space = extent_len;
+ }
+
+ if (scratch_space) {
+ *min_size += scratch_space;
+ /*
+ * Chunk allocation requires inserting/updating items in the
+ * chunk tree, so often this can lead to the need of allocating
+ * a new system chunk too, which has a maximum size of 32Mb.
+ */
+ *min_size += SZ_32M;
+ }
+}
+
+static int print_min_dev_size(int fd, u64 devid)
+{
+ int ret = 1;
+ /*
+ * Device allocations starts at 1Mb or at the value passed through the
+ * mount option alloc_start if it's bigger than 1Mb. The alloc_start
+ * option is used for debugging and testing only, and recently the
+ * possibility of deprecating/removing it has been discussed, so we
+ * ignore it here.
+ */
+ u64 min_size = SZ_1M;
+ struct btrfs_ioctl_search_args args;
+ struct btrfs_ioctl_search_key *sk = &args.key;
+ u64 last_pos = (u64)-1;
+ LIST_HEAD(extents);
+ LIST_HEAD(holes);
+
+ memset(&args, 0, sizeof(args));
+ sk->tree_id = BTRFS_DEV_TREE_OBJECTID;
+ sk->min_objectid = devid;
+ sk->max_objectid = devid;
+ sk->max_type = BTRFS_DEV_EXTENT_KEY;
+ sk->min_type = BTRFS_DEV_EXTENT_KEY;
+ sk->min_offset = 0;
+ sk->max_offset = (u64)-1;
+ sk->min_transid = 0;
+ sk->max_transid = (u64)-1;
+ sk->nr_items = 4096;
+
+ while (1) {
+ int i;
+ struct btrfs_ioctl_search_header *sh;
+ unsigned long off = 0;
+
+ ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
+ if (ret < 0) {
+ error("tree search ioctl: %m");
+ ret = 1;
+ goto out;
+ }
+
+ if (sk->nr_items == 0)
+ break;
+
+ for (i = 0; i < sk->nr_items; i++) {
+ struct btrfs_dev_extent *extent;
+ u64 len;
+
+ sh = (struct btrfs_ioctl_search_header *)(args.buf +
+ off);
+ off += sizeof(*sh);
+ extent = (struct btrfs_dev_extent *)(args.buf + off);
+ off += btrfs_search_header_len(sh);
+
+ sk->min_objectid = btrfs_search_header_objectid(sh);
+ sk->min_type = btrfs_search_header_type(sh);
+ sk->min_offset = btrfs_search_header_offset(sh) + 1;
+
+ if (btrfs_search_header_objectid(sh) != devid ||
+ btrfs_search_header_type(sh) != BTRFS_DEV_EXTENT_KEY)
+ continue;
+
+ len = btrfs_stack_dev_extent_length(extent);
+ min_size += len;
+ ret = add_dev_extent(&extents,
+ btrfs_search_header_offset(sh),
+ btrfs_search_header_offset(sh) + len - 1, 0);
+
+ if (!ret && last_pos != (u64)-1 &&
+ last_pos != btrfs_search_header_offset(sh))
+ ret = add_dev_extent(&holes, last_pos,
+ btrfs_search_header_offset(sh) - 1, 1);
+ if (ret) {
+ error("add device extent: %s", strerror(-ret));
+ ret = 1;
+ goto out;
+ }
+
+ last_pos = btrfs_search_header_offset(sh) + len;
+ }
+
+ if (sk->min_type != BTRFS_DEV_EXTENT_KEY ||
+ sk->min_objectid != devid)
+ break;
+ }
+
+ adjust_dev_min_size(&extents, &holes, &min_size);
+ printf("%llu bytes (%s)\n", min_size, pretty_size(min_size));
+ ret = 0;
+out:
+ free_dev_extent_list(&extents);
+ free_dev_extent_list(&holes);
+
+ return ret;
+}
+
+static int cmd_inspect_min_dev_size(int argc, char **argv)
+{
+ int ret;
+ int fd = -1;
+ DIR *dirstream = NULL;
+ u64 devid = 1;
+
+ while (1) {
+ int c;
+ enum { GETOPT_VAL_DEVID = 256 };
+ static const struct option long_options[] = {
+ { "id", required_argument, NULL, GETOPT_VAL_DEVID },
+ {NULL, 0, NULL, 0}
+ };
+
+ c = getopt_long(argc, argv, "", long_options, NULL);
+ if (c < 0)
+ break;
+
+ switch (c) {
+ case GETOPT_VAL_DEVID:
+ devid = arg_strtou64(optarg);
+ break;
+ default:
+ usage(cmd_inspect_min_dev_size_usage);
+ }
+ }
+ if (check_argc_exact(argc - optind, 1))
+ usage(cmd_inspect_min_dev_size_usage);
+
+ fd = btrfs_open_dir(argv[optind], &dirstream, 1);
+ if (fd < 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = print_min_dev_size(fd, devid);
+ close_file_or_dir(fd, dirstream);
+out:
+ return !!ret;
+}
+
+static const char inspect_cmd_group_info[] =
+"query various internal information";
+
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 },
- { "rootid", cmd_rootid, cmd_rootid_usage, NULL, 0 },
+ inspect_cmd_group_usage, inspect_cmd_group_info, {
+ { "inode-resolve", cmd_inspect_inode_resolve,
+ cmd_inspect_inode_resolve_usage, NULL, 0 },
+ { "logical-resolve", cmd_inspect_logical_resolve,
+ cmd_inspect_logical_resolve_usage, NULL, 0 },
+ { "subvolid-resolve", cmd_inspect_subvolid_resolve,
+ cmd_inspect_subvolid_resolve_usage, NULL, 0 },
+ { "rootid", cmd_inspect_rootid, cmd_inspect_rootid_usage, NULL,
+ 0 },
+ { "min-dev-size", cmd_inspect_min_dev_size,
+ cmd_inspect_min_dev_size_usage, NULL, 0 },
+ { "dump-tree", cmd_inspect_dump_tree,
+ cmd_inspect_dump_tree_usage, NULL, 0 },
+ { "dump-super", cmd_inspect_dump_super,
+ cmd_inspect_dump_super_usage, NULL, 0 },
+ { "tree-stats", cmd_inspect_tree_stats,
+ cmd_inspect_tree_stats_usage, NULL, 0 },
NULL_CMD_STRUCT
}
};
projects / platform / upstream / btrfs-progs.git / blobdiff