diff options
Diffstat (limited to 'c_src/libbcachefs/super-io.c')
| -rw-r--r-- | c_src/libbcachefs/super-io.c | 1391 |
1 files changed, 0 insertions, 1391 deletions
diff --git a/c_src/libbcachefs/super-io.c b/c_src/libbcachefs/super-io.c deleted file mode 100644 index 55926b81..00000000 --- a/c_src/libbcachefs/super-io.c +++ /dev/null @@ -1,1391 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -#include "bcachefs.h" -#include "checksum.h" -#include "counters.h" -#include "disk_groups.h" -#include "ec.h" -#include "error.h" -#include "journal.h" -#include "journal_sb.h" -#include "journal_seq_blacklist.h" -#include "recovery.h" -#include "replicas.h" -#include "quota.h" -#include "sb-clean.h" -#include "sb-downgrade.h" -#include "sb-errors.h" -#include "sb-members.h" -#include "super-io.h" -#include "super.h" -#include "trace.h" -#include "vstructs.h" - -#include <linux/backing-dev.h> -#include <linux/sort.h> - -static const struct blk_holder_ops bch2_sb_handle_bdev_ops = { -}; - -struct bch2_metadata_version { - u16 version; - const char *name; -}; - -static const struct bch2_metadata_version bch2_metadata_versions[] = { -#define x(n, v) { \ - .version = v, \ - .name = #n, \ -}, - BCH_METADATA_VERSIONS() -#undef x -}; - -void bch2_version_to_text(struct printbuf *out, unsigned v) -{ - const char *str = "(unknown version)"; - - for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++) - if (bch2_metadata_versions[i].version == v) { - str = bch2_metadata_versions[i].name; - break; - } - - prt_printf(out, "%u.%u: %s", BCH_VERSION_MAJOR(v), BCH_VERSION_MINOR(v), str); -} - -unsigned bch2_latest_compatible_version(unsigned v) -{ - if (!BCH_VERSION_MAJOR(v)) - return v; - - for (unsigned i = 0; i < ARRAY_SIZE(bch2_metadata_versions); i++) - if (bch2_metadata_versions[i].version > v && - BCH_VERSION_MAJOR(bch2_metadata_versions[i].version) == - BCH_VERSION_MAJOR(v)) - v = bch2_metadata_versions[i].version; - - return v; -} - -const char * const bch2_sb_fields[] = { -#define x(name, nr) #name, - BCH_SB_FIELDS() -#undef x - NULL -}; - -static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *, - struct printbuf *); - -struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb, - enum bch_sb_field_type type) -{ - /* XXX: need locking around superblock to access optional fields */ - - vstruct_for_each(sb, f) - if (le32_to_cpu(f->type) == type) - return f; - return NULL; -} - -static struct bch_sb_field *__bch2_sb_field_resize(struct bch_sb_handle *sb, - struct bch_sb_field *f, - unsigned u64s) -{ - unsigned old_u64s = f ? le32_to_cpu(f->u64s) : 0; - unsigned sb_u64s = le32_to_cpu(sb->sb->u64s) + u64s - old_u64s; - - BUG_ON(__vstruct_bytes(struct bch_sb, sb_u64s) > sb->buffer_size); - - if (!f && !u64s) { - /* nothing to do: */ - } else if (!f) { - f = vstruct_last(sb->sb); - memset(f, 0, sizeof(u64) * u64s); - f->u64s = cpu_to_le32(u64s); - f->type = 0; - } else { - void *src, *dst; - - src = vstruct_end(f); - - if (u64s) { - f->u64s = cpu_to_le32(u64s); - dst = vstruct_end(f); - } else { - dst = f; - } - - memmove(dst, src, vstruct_end(sb->sb) - src); - - if (dst > src) - memset(src, 0, dst - src); - } - - sb->sb->u64s = cpu_to_le32(sb_u64s); - - return u64s ? f : NULL; -} - -void bch2_sb_field_delete(struct bch_sb_handle *sb, - enum bch_sb_field_type type) -{ - struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type); - - if (f) - __bch2_sb_field_resize(sb, f, 0); -} - -/* Superblock realloc/free: */ - -void bch2_free_super(struct bch_sb_handle *sb) -{ - kfree(sb->bio); - if (!IS_ERR_OR_NULL(sb->bdev)) - blkdev_put(sb->bdev, sb->holder); - kfree(sb->holder); - kfree(sb->sb_name); - - kfree(sb->sb); - memset(sb, 0, sizeof(*sb)); -} - -int bch2_sb_realloc(struct bch_sb_handle *sb, unsigned u64s) -{ - size_t new_bytes = __vstruct_bytes(struct bch_sb, u64s); - size_t new_buffer_size; - struct bch_sb *new_sb; - struct bio *bio; - - if (sb->bdev) - new_bytes = max_t(size_t, new_bytes, bdev_logical_block_size(sb->bdev)); - - new_buffer_size = roundup_pow_of_two(new_bytes); - - if (sb->sb && sb->buffer_size >= new_buffer_size) - return 0; - - if (sb->sb && sb->have_layout) { - u64 max_bytes = 512 << sb->sb->layout.sb_max_size_bits; - - if (new_bytes > max_bytes) { - struct printbuf buf = PRINTBUF; - - prt_bdevname(&buf, sb->bdev); - prt_printf(&buf, ": superblock too big: want %zu but have %llu", new_bytes, max_bytes); - pr_err("%s", buf.buf); - printbuf_exit(&buf); - return -BCH_ERR_ENOSPC_sb; - } - } - - if (sb->buffer_size >= new_buffer_size && sb->sb) - return 0; - - if (dynamic_fault("bcachefs:add:super_realloc")) - return -BCH_ERR_ENOMEM_sb_realloc_injected; - - new_sb = krealloc(sb->sb, new_buffer_size, GFP_NOFS|__GFP_ZERO); - if (!new_sb) - return -BCH_ERR_ENOMEM_sb_buf_realloc; - - sb->sb = new_sb; - - if (sb->have_bio) { - unsigned nr_bvecs = buf_pages(sb->sb, new_buffer_size); - - bio = bio_kmalloc(nr_bvecs, GFP_KERNEL); - if (!bio) - return -BCH_ERR_ENOMEM_sb_bio_realloc; - - bio_init(bio, NULL, bio->bi_inline_vecs, nr_bvecs, 0); - - kfree(sb->bio); - sb->bio = bio; - } - - sb->buffer_size = new_buffer_size; - - return 0; -} - -struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *sb, - enum bch_sb_field_type type, - unsigned u64s) -{ - struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type); - ssize_t old_u64s = f ? le32_to_cpu(f->u64s) : 0; - ssize_t d = -old_u64s + u64s; - - if (bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s) + d)) - return NULL; - - if (sb->fs_sb) { - struct bch_fs *c = container_of(sb, struct bch_fs, disk_sb); - - lockdep_assert_held(&c->sb_lock); - - /* XXX: we're not checking that offline device have enough space */ - - for_each_online_member(c, ca) { - struct bch_sb_handle *dev_sb = &ca->disk_sb; - - if (bch2_sb_realloc(dev_sb, le32_to_cpu(dev_sb->sb->u64s) + d)) { - percpu_ref_put(&ca->ref); - return NULL; - } - } - } - - f = bch2_sb_field_get_id(sb->sb, type); - f = __bch2_sb_field_resize(sb, f, u64s); - if (f) - f->type = cpu_to_le32(type); - return f; -} - -struct bch_sb_field *bch2_sb_field_get_minsize_id(struct bch_sb_handle *sb, - enum bch_sb_field_type type, - unsigned u64s) -{ - struct bch_sb_field *f = bch2_sb_field_get_id(sb->sb, type); - - if (!f || le32_to_cpu(f->u64s) < u64s) - f = bch2_sb_field_resize_id(sb, type, u64s); - return f; -} - -/* Superblock validate: */ - -static int validate_sb_layout(struct bch_sb_layout *layout, struct printbuf *out) -{ - u64 offset, prev_offset, max_sectors; - unsigned i; - - BUILD_BUG_ON(sizeof(struct bch_sb_layout) != 512); - - if (!uuid_equal(&layout->magic, &BCACHE_MAGIC) && - !uuid_equal(&layout->magic, &BCHFS_MAGIC)) { - prt_printf(out, "Not a bcachefs superblock layout"); - return -BCH_ERR_invalid_sb_layout; - } - - if (layout->layout_type != 0) { - prt_printf(out, "Invalid superblock layout type %u", - layout->layout_type); - return -BCH_ERR_invalid_sb_layout_type; - } - - if (!layout->nr_superblocks) { - prt_printf(out, "Invalid superblock layout: no superblocks"); - return -BCH_ERR_invalid_sb_layout_nr_superblocks; - } - - if (layout->nr_superblocks > ARRAY_SIZE(layout->sb_offset)) { - prt_printf(out, "Invalid superblock layout: too many superblocks"); - return -BCH_ERR_invalid_sb_layout_nr_superblocks; - } - - max_sectors = 1 << layout->sb_max_size_bits; - - prev_offset = le64_to_cpu(layout->sb_offset[0]); - - for (i = 1; i < layout->nr_superblocks; i++) { - offset = le64_to_cpu(layout->sb_offset[i]); - - if (offset < prev_offset + max_sectors) { - prt_printf(out, "Invalid superblock layout: superblocks overlap\n" - " (sb %u ends at %llu next starts at %llu", - i - 1, prev_offset + max_sectors, offset); - return -BCH_ERR_invalid_sb_layout_superblocks_overlap; - } - prev_offset = offset; - } - - return 0; -} - -static int bch2_sb_compatible(struct bch_sb *sb, struct printbuf *out) -{ - u16 version = le16_to_cpu(sb->version); - u16 version_min = le16_to_cpu(sb->version_min); - - if (!bch2_version_compatible(version)) { - prt_str(out, "Unsupported superblock version "); - bch2_version_to_text(out, version); - prt_str(out, " (min "); - bch2_version_to_text(out, bcachefs_metadata_version_min); - prt_str(out, ", max "); - bch2_version_to_text(out, bcachefs_metadata_version_current); - prt_str(out, ")"); - return -BCH_ERR_invalid_sb_version; - } - - if (!bch2_version_compatible(version_min)) { - prt_str(out, "Unsupported superblock version_min "); - bch2_version_to_text(out, version_min); - prt_str(out, " (min "); - bch2_version_to_text(out, bcachefs_metadata_version_min); - prt_str(out, ", max "); - bch2_version_to_text(out, bcachefs_metadata_version_current); - prt_str(out, ")"); - return -BCH_ERR_invalid_sb_version; - } - - if (version_min > version) { - prt_str(out, "Bad minimum version "); - bch2_version_to_text(out, version_min); - prt_str(out, ", greater than version field "); - bch2_version_to_text(out, version); - return -BCH_ERR_invalid_sb_version; - } - - return 0; -} - -static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out, - int rw) -{ - struct bch_sb *sb = disk_sb->sb; - struct bch_sb_field_members_v1 *mi; - enum bch_opt_id opt_id; - u16 block_size; - int ret; - - ret = bch2_sb_compatible(sb, out); - if (ret) - return ret; - - if (sb->features[1] || - (le64_to_cpu(sb->features[0]) & (~0ULL << BCH_FEATURE_NR))) { - prt_printf(out, "Filesystem has incompatible features"); - return -BCH_ERR_invalid_sb_features; - } - - block_size = le16_to_cpu(sb->block_size); - - if (block_size > PAGE_SECTORS) { - prt_printf(out, "Block size too big (got %u, max %u)", - block_size, PAGE_SECTORS); - return -BCH_ERR_invalid_sb_block_size; - } - - if (bch2_is_zero(sb->user_uuid.b, sizeof(sb->user_uuid))) { - prt_printf(out, "Bad user UUID (got zeroes)"); - return -BCH_ERR_invalid_sb_uuid; - } - - if (bch2_is_zero(sb->uuid.b, sizeof(sb->uuid))) { - prt_printf(out, "Bad internal UUID (got zeroes)"); - return -BCH_ERR_invalid_sb_uuid; - } - - if (!sb->nr_devices || - sb->nr_devices > BCH_SB_MEMBERS_MAX) { - prt_printf(out, "Bad number of member devices %u (max %u)", - sb->nr_devices, BCH_SB_MEMBERS_MAX); - return -BCH_ERR_invalid_sb_too_many_members; - } - - if (sb->dev_idx >= sb->nr_devices) { - prt_printf(out, "Bad dev_idx (got %u, nr_devices %u)", - sb->dev_idx, sb->nr_devices); - return -BCH_ERR_invalid_sb_dev_idx; - } - - if (!sb->time_precision || - le32_to_cpu(sb->time_precision) > NSEC_PER_SEC) { - prt_printf(out, "Invalid time precision: %u (min 1, max %lu)", - le32_to_cpu(sb->time_precision), NSEC_PER_SEC); - return -BCH_ERR_invalid_sb_time_precision; - } - - if (rw == READ) { - /* - * Been seeing a bug where these are getting inexplicably - * zeroed, so we're now validating them, but we have to be - * careful not to preven people's filesystems from mounting: - */ - if (!BCH_SB_JOURNAL_FLUSH_DELAY(sb)) - SET_BCH_SB_JOURNAL_FLUSH_DELAY(sb, 1000); - if (!BCH_SB_JOURNAL_RECLAIM_DELAY(sb)) - SET_BCH_SB_JOURNAL_RECLAIM_DELAY(sb, 1000); - - if (!BCH_SB_VERSION_UPGRADE_COMPLETE(sb)) - SET_BCH_SB_VERSION_UPGRADE_COMPLETE(sb, le16_to_cpu(sb->version)); - } - - for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) { - const struct bch_option *opt = bch2_opt_table + opt_id; - - if (opt->get_sb != BCH2_NO_SB_OPT) { - u64 v = bch2_opt_from_sb(sb, opt_id); - - prt_printf(out, "Invalid option "); - ret = bch2_opt_validate(opt, v, out); - if (ret) - return ret; - - printbuf_reset(out); - } - } - - /* validate layout */ - ret = validate_sb_layout(&sb->layout, out); - if (ret) - return ret; - - vstruct_for_each(sb, f) { - if (!f->u64s) { - prt_printf(out, "Invalid superblock: optional field with size 0 (type %u)", - le32_to_cpu(f->type)); - return -BCH_ERR_invalid_sb_field_size; - } - - if (vstruct_next(f) > vstruct_last(sb)) { - prt_printf(out, "Invalid superblock: optional field extends past end of superblock (type %u)", - le32_to_cpu(f->type)); - return -BCH_ERR_invalid_sb_field_size; - } - } - - /* members must be validated first: */ - mi = bch2_sb_field_get(sb, members_v1); - if (!mi) { - prt_printf(out, "Invalid superblock: member info area missing"); - return -BCH_ERR_invalid_sb_members_missing; - } - - ret = bch2_sb_field_validate(sb, &mi->field, out); - if (ret) - return ret; - - vstruct_for_each(sb, f) { - if (le32_to_cpu(f->type) == BCH_SB_FIELD_members_v1) - continue; - - ret = bch2_sb_field_validate(sb, f, out); - if (ret) - return ret; - } - - return 0; -} - -/* device open: */ - -static unsigned long le_ulong_to_cpu(unsigned long v) -{ - return sizeof(unsigned long) == 8 - ? le64_to_cpu(v) - : le32_to_cpu(v); -} - -static void le_bitvector_to_cpu(unsigned long *dst, unsigned long *src, unsigned nr) -{ - BUG_ON(nr & (BITS_PER_TYPE(long) - 1)); - - for (unsigned i = 0; i < BITS_TO_LONGS(nr); i++) - dst[i] = le_ulong_to_cpu(src[i]); -} - -static void bch2_sb_update(struct bch_fs *c) -{ - struct bch_sb *src = c->disk_sb.sb; - - lockdep_assert_held(&c->sb_lock); - - c->sb.uuid = src->uuid; - c->sb.user_uuid = src->user_uuid; - c->sb.version = le16_to_cpu(src->version); - c->sb.version_min = le16_to_cpu(src->version_min); - c->sb.version_upgrade_complete = BCH_SB_VERSION_UPGRADE_COMPLETE(src); - c->sb.nr_devices = src->nr_devices; - c->sb.clean = BCH_SB_CLEAN(src); - c->sb.encryption_type = BCH_SB_ENCRYPTION_TYPE(src); - - c->sb.nsec_per_time_unit = le32_to_cpu(src->time_precision); - c->sb.time_units_per_sec = NSEC_PER_SEC / c->sb.nsec_per_time_unit; - - /* XXX this is wrong, we need a 96 or 128 bit integer type */ - c->sb.time_base_lo = div_u64(le64_to_cpu(src->time_base_lo), - c->sb.nsec_per_time_unit); - c->sb.time_base_hi = le32_to_cpu(src->time_base_hi); - - c->sb.features = le64_to_cpu(src->features[0]); - c->sb.compat = le64_to_cpu(src->compat[0]); - - memset(c->sb.errors_silent, 0, sizeof(c->sb.errors_silent)); - - struct bch_sb_field_ext *ext = bch2_sb_field_get(src, ext); - if (ext) - le_bitvector_to_cpu(c->sb.errors_silent, (void *) ext->errors_silent, - sizeof(c->sb.errors_silent) * 8); - - for_each_member_device(c, ca) { - struct bch_member m = bch2_sb_member_get(src, ca->dev_idx); - ca->mi = bch2_mi_to_cpu(&m); - } -} - -static int __copy_super(struct bch_sb_handle *dst_handle, struct bch_sb *src) -{ - struct bch_sb_field *src_f, *dst_f; - struct bch_sb *dst = dst_handle->sb; - unsigned i; - - dst->version = src->version; - dst->version_min = src->version_min; - dst->seq = src->seq; - dst->uuid = src->uuid; - dst->user_uuid = src->user_uuid; - memcpy(dst->label, src->label, sizeof(dst->label)); - - dst->block_size = src->block_size; - dst->nr_devices = src->nr_devices; - - dst->time_base_lo = src->time_base_lo; - dst->time_base_hi = src->time_base_hi; - dst->time_precision = src->time_precision; - dst->write_time = src->write_time; - - memcpy(dst->flags, src->flags, sizeof(dst->flags)); - memcpy(dst->features, src->features, sizeof(dst->features)); - memcpy(dst->compat, src->compat, sizeof(dst->compat)); - - for (i = 0; i < BCH_SB_FIELD_NR; i++) { - int d; - - if ((1U << i) & BCH_SINGLE_DEVICE_SB_FIELDS) - continue; - - src_f = bch2_sb_field_get_id(src, i); - dst_f = bch2_sb_field_get_id(dst, i); - - d = (src_f ? le32_to_cpu(src_f->u64s) : 0) - - (dst_f ? le32_to_cpu(dst_f->u64s) : 0); - if (d > 0) { - int ret = bch2_sb_realloc(dst_handle, - le32_to_cpu(dst_handle->sb->u64s) + d); - - if (ret) - return ret; - - dst = dst_handle->sb; - dst_f = bch2_sb_field_get_id(dst, i); - } - - dst_f = __bch2_sb_field_resize(dst_handle, dst_f, - src_f ? le32_to_cpu(src_f->u64s) : 0); - - if (src_f) - memcpy(dst_f, src_f, vstruct_bytes(src_f)); - } - - return 0; -} - -int bch2_sb_to_fs(struct bch_fs *c, struct bch_sb *src) -{ - int ret; - - lockdep_assert_held(&c->sb_lock); - - ret = bch2_sb_realloc(&c->disk_sb, 0) ?: - __copy_super(&c->disk_sb, src) ?: - bch2_sb_replicas_to_cpu_replicas(c) ?: - bch2_sb_disk_groups_to_cpu(c); - if (ret) - return ret; - - bch2_sb_update(c); - return 0; -} - -int bch2_sb_from_fs(struct bch_fs *c, struct bch_dev *ca) -{ - return __copy_super(&ca->disk_sb, c->disk_sb.sb); -} - -/* read superblock: */ - -static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf *err) -{ - size_t bytes; - int ret; -reread: - bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META); - sb->bio->bi_iter.bi_sector = offset; - bch2_bio_map(sb->bio, sb->sb, sb->buffer_size); - - ret = submit_bio_wait(sb->bio); - if (ret) { - prt_printf(err, "IO error: %i", ret); - return ret; - } - - if (!uuid_equal(&sb->sb->magic, &BCACHE_MAGIC) && - !uuid_equal(&sb->sb->magic, &BCHFS_MAGIC)) { - prt_str(err, "Not a bcachefs superblock (got magic "); - pr_uuid(err, sb->sb->magic.b); - prt_str(err, ")"); - return -BCH_ERR_invalid_sb_magic; - } - - ret = bch2_sb_compatible(sb->sb, err); - if (ret) - return ret; - - bytes = vstruct_bytes(sb->sb); - - if (bytes > 512 << sb->sb->layout.sb_max_size_bits) { - prt_printf(err, "Invalid superblock: too big (got %zu bytes, layout max %lu)", - bytes, 512UL << sb->sb->layout.sb_max_size_bits); - return -BCH_ERR_invalid_sb_too_big; - } - - if (bytes > sb->buffer_size) { - ret = bch2_sb_realloc(sb, le32_to_cpu(sb->sb->u64s)); - if (ret) - return ret; - goto reread; - } - - enum bch_csum_type csum_type = BCH_SB_CSUM_TYPE(sb->sb); - if (csum_type >= BCH_CSUM_NR) { - prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb)); - return -BCH_ERR_invalid_sb_csum_type; - } - - /* XXX: verify MACs */ - struct bch_csum csum = csum_vstruct(NULL, csum_type, null_nonce(), sb->sb); - if (bch2_crc_cmp(csum, sb->sb->csum)) { - bch2_csum_err_msg(err, csum_type, sb->sb->csum, csum); - return -BCH_ERR_invalid_sb_csum; - } - - sb->seq = le64_to_cpu(sb->sb->seq); - - return 0; -} - -static int __bch2_read_super(const char *path, struct bch_opts *opts, - struct bch_sb_handle *sb, bool ignore_notbchfs_msg) -{ - u64 offset = opt_get(*opts, sb); - struct bch_sb_layout layout; - struct printbuf err = PRINTBUF; - struct printbuf err2 = PRINTBUF; - __le64 *i; - int ret; -#ifndef __KERNEL__ -retry: -#endif - memset(sb, 0, sizeof(*sb)); - sb->mode = BLK_OPEN_READ; - sb->have_bio = true; - sb->holder = kmalloc(1, GFP_KERNEL); - if (!sb->holder) - return -ENOMEM; - - sb->sb_name = kstrdup(path, GFP_KERNEL); - if (!sb->sb_name) - return -ENOMEM; - -#ifndef __KERNEL__ - if (opt_get(*opts, direct_io) == false) - sb->mode |= BLK_OPEN_BUFFERED; -#endif - - if (!opt_get(*opts, noexcl)) - sb->mode |= BLK_OPEN_EXCL; - - if (!opt_get(*opts, nochanges)) - sb->mode |= BLK_OPEN_WRITE; - - sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops); - if (IS_ERR(sb->bdev) && - PTR_ERR(sb->bdev) == -EACCES && - opt_get(*opts, read_only)) { - sb->mode &= ~BLK_OPEN_WRITE; - - sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops); - if (!IS_ERR(sb->bdev)) - opt_set(*opts, nochanges, true); - } - - if (IS_ERR(sb->bdev)) { - ret = PTR_ERR(sb->bdev); - goto out; - } - - ret = bch2_sb_realloc(sb, 0); - if (ret) { - prt_printf(&err, "error allocating memory for superblock"); - goto err; - } - - if (bch2_fs_init_fault("read_super")) { - prt_printf(&err, "dynamic fault"); - ret = -EFAULT; - goto err; - } - - ret = read_one_super(sb, offset, &err); - if (!ret) - goto got_super; - - if (opt_defined(*opts, sb)) - goto err; - - prt_printf(&err2, "bcachefs (%s): error reading default superblock: %s\n", - path, err.buf); - if (ret == -BCH_ERR_invalid_sb_magic && ignore_notbchfs_msg) - printk(KERN_INFO "%s", err2.buf); - else - printk(KERN_ERR "%s", err2.buf); - - printbuf_exit(&err2); - printbuf_reset(&err); - - /* - * Error reading primary superblock - read location of backup - * superblocks: - */ - bio_reset(sb->bio, sb->bdev, REQ_OP_READ|REQ_SYNC|REQ_META); - sb->bio->bi_iter.bi_sector = BCH_SB_LAYOUT_SECTOR; - /* - * use sb buffer to read layout, since sb buffer is page aligned but - * layout won't be: - */ - bch2_bio_map(sb->bio, sb->sb, sizeof(struct bch_sb_layout)); - - ret = submit_bio_wait(sb->bio); - if (ret) { - prt_printf(&err, "IO error: %i", ret); - goto err; - } - - memcpy(&layout, sb->sb, sizeof(layout)); - ret = validate_sb_layout(&layout, &err); - if (ret) - goto err; - - for (i = layout.sb_offset; - i < layout.sb_offset + layout.nr_superblocks; i++) { - offset = le64_to_cpu(*i); - - if (offset == opt_get(*opts, sb)) - continue; - - ret = read_one_super(sb, offset, &err); - if (!ret) - goto got_super; - } - - goto err; - -got_super: - if (le16_to_cpu(sb->sb->block_size) << 9 < - bdev_logical_block_size(sb->bdev) && - opt_get(*opts, direct_io)) { -#ifndef __KERNEL__ - opt_set(*opts, direct_io, false); - bch2_free_super(sb); - goto retry; -#endif - prt_printf(&err, "block size (%u) smaller than device block size (%u)", - le16_to_cpu(sb->sb->block_size) << 9, - bdev_logical_block_size(sb->bdev)); - ret = -BCH_ERR_block_size_too_small; - goto err; - } - - ret = 0; - sb->have_layout = true; - - ret = bch2_sb_validate(sb, &err, READ); - if (ret) { - printk(KERN_ERR "bcachefs (%s): error validating superblock: %s\n", - path, err.buf); - goto err_no_print; - } -out: - printbuf_exit(&err); - return ret; -err: - printk(KERN_ERR "bcachefs (%s): error reading superblock: %s\n", - path, err.buf); -err_no_print: - bch2_free_super(sb); - goto out; -} - -int bch2_read_super(const char *path, struct bch_opts *opts, - struct bch_sb_handle *sb) -{ - return __bch2_read_super(path, opts, sb, false); -} - -/* provide a silenced version for mount.bcachefs */ - -int bch2_read_super_silent(const char *path, struct bch_opts *opts, - struct bch_sb_handle *sb) -{ - return __bch2_read_super(path, opts, sb, true); -} - -/* write superblock: */ - -static void write_super_endio(struct bio *bio) -{ - struct bch_dev *ca = bio->bi_private; - - /* XXX: return errors directly */ - - if (bch2_dev_io_err_on(bio->bi_status, ca, - bio_data_dir(bio) - ? BCH_MEMBER_ERROR_write - : BCH_MEMBER_ERROR_read, - "superblock %s error: %s", - bio_data_dir(bio) ? "write" : "read", - bch2_blk_status_to_str(bio->bi_status))) - ca->sb_write_error = 1; - - closure_put(&ca->fs->sb_write); - percpu_ref_put(&ca->io_ref); -} - -static void read_back_super(struct bch_fs *c, struct bch_dev *ca) -{ - struct bch_sb *sb = ca->disk_sb.sb; - struct bio *bio = ca->disk_sb.bio; - - bio_reset(bio, ca->disk_sb.bdev, REQ_OP_READ|REQ_SYNC|REQ_META); - bio->bi_iter.bi_sector = le64_to_cpu(sb->layout.sb_offset[0]); - bio->bi_end_io = write_super_endio; - bio->bi_private = ca; - bch2_bio_map(bio, ca->sb_read_scratch, PAGE_SIZE); - - this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_sb], - bio_sectors(bio)); - - percpu_ref_get(&ca->io_ref); - closure_bio_submit(bio, &c->sb_write); -} - -static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx) -{ - struct bch_sb *sb = ca->disk_sb.sb; - struct bio *bio = ca->disk_sb.bio; - - sb->offset = sb->layout.sb_offset[idx]; - - SET_BCH_SB_CSUM_TYPE(sb, bch2_csum_opt_to_type(c->opts.metadata_checksum, false)); - sb->csum = csum_vstruct(c, BCH_SB_CSUM_TYPE(sb), - null_nonce(), sb); - - bio_reset(bio, ca->disk_sb.bdev, REQ_OP_WRITE|REQ_SYNC|REQ_META); - bio->bi_iter.bi_sector = le64_to_cpu(sb->offset); - bio->bi_end_io = write_super_endio; - bio->bi_private = ca; - bch2_bio_map(bio, sb, - roundup((size_t) vstruct_bytes(sb), - bdev_logical_block_size(ca->disk_sb.bdev))); - - this_cpu_add(ca->io_done->sectors[WRITE][BCH_DATA_sb], - bio_sectors(bio)); - - percpu_ref_get(&ca->io_ref); - closure_bio_submit(bio, &c->sb_write); -} - -int bch2_write_super(struct bch_fs *c) -{ - struct closure *cl = &c->sb_write; - struct printbuf err = PRINTBUF; - unsigned sb = 0, nr_wrote; - struct bch_devs_mask sb_written; - bool wrote, can_mount_without_written, can_mount_with_written; - unsigned degraded_flags = BCH_FORCE_IF_DEGRADED; - int ret = 0; - - trace_and_count(c, write_super, c, _RET_IP_); - - if (c->opts.very_degraded) - degraded_flags |= BCH_FORCE_IF_LOST; - - lockdep_assert_held(&c->sb_lock); - - closure_init_stack(cl); - memset(&sb_written, 0, sizeof(sb_written)); - - /* Make sure we're using the new magic numbers: */ - c->disk_sb.sb->magic = BCHFS_MAGIC; - c->disk_sb.sb->layout.magic = BCHFS_MAGIC; - - le64_add_cpu(&c->disk_sb.sb->seq, 1); - - struct bch_sb_field_members_v2 *mi = bch2_sb_field_get(c->disk_sb.sb, members_v2); - for_each_online_member(c, ca) - __bch2_members_v2_get_mut(mi, ca->dev_idx)->seq = c->disk_sb.sb->seq; - c->disk_sb.sb->write_time = cpu_to_le64(ktime_get_real_seconds()); - - if (test_bit(BCH_FS_error, &c->flags)) - SET_BCH_SB_HAS_ERRORS(c->disk_sb.sb, 1); - if (test_bit(BCH_FS_topology_error, &c->flags)) - SET_BCH_SB_HAS_TOPOLOGY_ERRORS(c->disk_sb.sb, 1); - - SET_BCH_SB_BIG_ENDIAN(c->disk_sb.sb, CPU_BIG_ENDIAN); - - bch2_sb_counters_from_cpu(c); - bch2_sb_members_from_cpu(c); - bch2_sb_members_cpy_v2_v1(&c->disk_sb); - bch2_sb_errors_from_cpu(c); - bch2_sb_downgrade_update(c); - - for_each_online_member(c, ca) - bch2_sb_from_fs(c, ca); - - for_each_online_member(c, ca) { - printbuf_reset(&err); - - ret = bch2_sb_validate(&ca->disk_sb, &err, WRITE); - if (ret) { - bch2_fs_inconsistent(c, "sb invalid before write: %s", err.buf); - percpu_ref_put(&ca->io_ref); - goto out; - } - } - - if (c->opts.nochanges) - goto out; - - /* - * Defer writing the superblock until filesystem initialization is - * complete - don't write out a partly initialized superblock: - */ - if (!BCH_SB_INITIALIZED(c->disk_sb.sb)) - goto out; - - if (le16_to_cpu(c->disk_sb.sb->version) > bcachefs_metadata_version_current) { - struct printbuf buf = PRINTBUF; - prt_printf(&buf, "attempting to write superblock that wasn't version downgraded ("); - bch2_version_to_text(&buf, le16_to_cpu(c->disk_sb.sb->version)); - prt_str(&buf, " > "); - bch2_version_to_text(&buf, bcachefs_metadata_version_current); - prt_str(&buf, ")"); - bch2_fs_fatal_error(c, "%s", buf.buf); - printbuf_exit(&buf); - return -BCH_ERR_sb_not_downgraded; - } - - for_each_online_member(c, ca) { - __set_bit(ca->dev_idx, sb_written.d); - ca->sb_write_error = 0; - } - - for_each_online_member(c, ca) - read_back_super(c, ca); - closure_sync(cl); - - for_each_online_member(c, ca) { - if (ca->sb_write_error) - continue; - - if (le64_to_cpu(ca->sb_read_scratch->seq) < ca->disk_sb.seq) { - bch2_fs_fatal_error(c, - "Superblock write was silently dropped! (seq %llu expected %llu)", - le64_to_cpu(ca->sb_read_scratch->seq), - ca->disk_sb.seq); - percpu_ref_put(&ca->io_ref); - ret = -BCH_ERR_erofs_sb_err; - goto out; - } - - if (le64_to_cpu(ca->sb_read_scratch->seq) > ca->disk_sb.seq) { - bch2_fs_fatal_error(c, - "Superblock modified by another process (seq %llu expected %llu)", - le64_to_cpu(ca->sb_read_scratch->seq), - ca->disk_sb.seq); - percpu_ref_put(&ca->io_ref); - ret = -BCH_ERR_erofs_sb_err; - goto out; - } - } - - do { - wrote = false; - for_each_online_member(c, ca) - if (!ca->sb_write_error && - sb < ca->disk_sb.sb->layout.nr_superblocks) { - write_one_super(c, ca, sb); - wrote = true; - } - closure_sync(cl); - sb++; - } while (wrote); - - for_each_online_member(c, ca) { - if (ca->sb_write_error) - __clear_bit(ca->dev_idx, sb_written.d); - else - ca->disk_sb.seq = le64_to_cpu(ca->disk_sb.sb->seq); - } - - nr_wrote = dev_mask_nr(&sb_written); - - can_mount_with_written = - bch2_have_enough_devs(c, sb_written, degraded_flags, false); - - for (unsigned i = 0; i < ARRAY_SIZE(sb_written.d); i++) - sb_written.d[i] = ~sb_written.d[i]; - - can_mount_without_written = - bch2_have_enough_devs(c, sb_written, degraded_flags, false); - - /* - * If we would be able to mount _without_ the devices we successfully - * wrote superblocks to, we weren't able to write to enough devices: - * - * Exception: if we can mount without the successes because we haven't - * written anything (new filesystem), we continue if we'd be able to - * mount with the devices we did successfully write to: - */ - if (bch2_fs_fatal_err_on(!nr_wrote || - !can_mount_with_written || - (can_mount_without_written && - !can_mount_with_written), c, - "Unable to write superblock to sufficient devices (from %ps)", - (void *) _RET_IP_)) - ret = -1; -out: - /* Make new options visible after they're persistent: */ - bch2_sb_update(c); - printbuf_exit(&err); - return ret; -} - -void __bch2_check_set_feature(struct bch_fs *c, unsigned feat) -{ - mutex_lock(&c->sb_lock); - if (!(c->sb.features & (1ULL << feat))) { - c->disk_sb.sb->features[0] |= cpu_to_le64(1ULL << feat); - - bch2_write_super(c); - } - mutex_unlock(&c->sb_lock); -} - -/* Downgrade if superblock is at a higher version than currently supported: */ -bool bch2_check_version_downgrade(struct bch_fs *c) -{ - bool ret = bcachefs_metadata_version_current < c->sb.version; - - lockdep_assert_held(&c->sb_lock); - - /* - * Downgrade, if superblock is at a higher version than currently - * supported: - * - * c->sb will be checked before we write the superblock, so update it as - * well: - */ - if (BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb) > bcachefs_metadata_version_current) { - SET_BCH_SB_VERSION_UPGRADE_COMPLETE(c->disk_sb.sb, bcachefs_metadata_version_current); - c->sb.version_upgrade_complete = bcachefs_metadata_version_current; - } - if (c->sb.version > bcachefs_metadata_version_current) { - c->disk_sb.sb->version = cpu_to_le16(bcachefs_metadata_version_current); - c->sb.version = bcachefs_metadata_version_current; - } - if (c->sb.version_min > bcachefs_metadata_version_current) { - c->disk_sb.sb->version_min = cpu_to_le16(bcachefs_metadata_version_current); - c->sb.version_min = bcachefs_metadata_version_current; - } - c->disk_sb.sb->compat[0] &= cpu_to_le64((1ULL << BCH_COMPAT_NR) - 1); - return ret; -} - -void bch2_sb_upgrade(struct bch_fs *c, unsigned new_version) -{ - lockdep_assert_held(&c->sb_lock); - - if (BCH_VERSION_MAJOR(new_version) > - BCH_VERSION_MAJOR(le16_to_cpu(c->disk_sb.sb->version))) - bch2_sb_field_resize(&c->disk_sb, downgrade, 0); - - c->disk_sb.sb->version = cpu_to_le16(new_version); - c->disk_sb.sb->features[0] |= cpu_to_le64(BCH_SB_FEATURES_ALL); -} - -static int bch2_sb_ext_validate(struct bch_sb *sb, struct bch_sb_field *f, - struct printbuf *err) -{ - if (vstruct_bytes(f) < 88) { - prt_printf(err, "field too small (%zu < %u)", vstruct_bytes(f), 88); - return -BCH_ERR_invalid_sb_ext; - } - - return 0; -} - -static void bch2_sb_ext_to_text(struct printbuf *out, struct bch_sb *sb, - struct bch_sb_field *f) -{ - struct bch_sb_field_ext *e = field_to_type(f, ext); - - prt_printf(out, "Recovery passes required:"); - prt_tab(out); - prt_bitflags(out, bch2_recovery_passes, - bch2_recovery_passes_from_stable(le64_to_cpu(e->recovery_passes_required[0]))); - prt_newline(out); - - unsigned long *errors_silent = kmalloc(sizeof(e->errors_silent), GFP_KERNEL); - if (errors_silent) { - le_bitvector_to_cpu(errors_silent, (void *) e->errors_silent, sizeof(e->errors_silent) * 8); - - prt_printf(out, "Errors to silently fix:"); - prt_tab(out); - prt_bitflags_vector(out, bch2_sb_error_strs, errors_silent, sizeof(e->errors_silent) * 8); - prt_newline(out); - - kfree(errors_silent); - } -} - -static const struct bch_sb_field_ops bch_sb_field_ops_ext = { - .validate = bch2_sb_ext_validate, - .to_text = bch2_sb_ext_to_text, -}; - -static const struct bch_sb_field_ops *bch2_sb_field_ops[] = { -#define x(f, nr) \ - [BCH_SB_FIELD_##f] = &bch_sb_field_ops_##f, - BCH_SB_FIELDS() -#undef x -}; - -static const struct bch_sb_field_ops bch2_sb_field_null_ops; - -static const struct bch_sb_field_ops *bch2_sb_field_type_ops(unsigned type) -{ - return likely(type < ARRAY_SIZE(bch2_sb_field_ops)) - ? bch2_sb_field_ops[type] - : &bch2_sb_field_null_ops; -} - -static int bch2_sb_field_validate(struct bch_sb *sb, struct bch_sb_field *f, - struct printbuf *err) -{ - unsigned type = le32_to_cpu(f->type); - struct printbuf field_err = PRINTBUF; - const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type); - int ret; - - ret = ops->validate ? ops->validate(sb, f, &field_err) : 0; - if (ret) { - prt_printf(err, "Invalid superblock section %s: %s", - bch2_sb_fields[type], field_err.buf); - prt_newline(err); - bch2_sb_field_to_text(err, sb, f); - } - - printbuf_exit(&field_err); - return ret; -} - -void __bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb, - struct bch_sb_field *f) -{ - unsigned type = le32_to_cpu(f->type); - const struct bch_sb_field_ops *ops = bch2_sb_field_type_ops(type); - - if (!out->nr_tabstops) - printbuf_tabstop_push(out, 32); - - if (ops->to_text) - ops->to_text(out, sb, f); -} - -void bch2_sb_field_to_text(struct printbuf *out, struct bch_sb *sb, - struct bch_sb_field *f) -{ - unsigned type = le32_to_cpu(f->type); - - if (type < BCH_SB_FIELD_NR) - prt_printf(out, "%s", bch2_sb_fields[type]); - else - prt_printf(out, "(unknown field %u)", type); - - prt_printf(out, " (size %zu):", vstruct_bytes(f)); - prt_newline(out); - - __bch2_sb_field_to_text(out, sb, f); -} - -void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l) -{ - unsigned i; - - prt_printf(out, "Type: %u", l->layout_type); - prt_newline(out); - - prt_str(out, "Superblock max size: "); - prt_units_u64(out, 512 << l->sb_max_size_bits); - prt_newline(out); - - prt_printf(out, "Nr superblocks: %u", l->nr_superblocks); - prt_newline(out); - - prt_str(out, "Offsets: "); - for (i = 0; i < l->nr_superblocks; i++) { - if (i) - prt_str(out, ", "); - prt_printf(out, "%llu", le64_to_cpu(l->sb_offset[i])); - } - prt_newline(out); -} - -void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb, - bool print_layout, unsigned fields) -{ - u64 fields_have = 0; - unsigned nr_devices = 0; - - if (!out->nr_tabstops) - printbuf_tabstop_push(out, 44); - - for (int i = 0; i < sb->nr_devices; i++) - nr_devices += bch2_dev_exists(sb, i); - - prt_printf(out, "External UUID:"); - prt_tab(out); - pr_uuid(out, sb->user_uuid.b); - prt_newline(out); - - prt_printf(out, "Internal UUID:"); - prt_tab(out); - pr_uuid(out, sb->uuid.b); - prt_newline(out); - - prt_printf(out, "Magic number:"); - prt_tab(out); - pr_uuid(out, sb->magic.b); - prt_newline(out); - - prt_str(out, "Device index:"); - prt_tab(out); - prt_printf(out, "%u", sb->dev_idx); - prt_newline(out); - - prt_str(out, "Label:"); - prt_tab(out); - prt_printf(out, "%.*s", (int) sizeof(sb->label), sb->label); - prt_newline(out); - - prt_str(out, "Version:"); - prt_tab(out); - bch2_version_to_text(out, le16_to_cpu(sb->version)); - prt_newline(out); - - prt_str(out, "Version upgrade complete:"); - prt_tab(out); - bch2_version_to_text(out, BCH_SB_VERSION_UPGRADE_COMPLETE(sb)); - prt_newline(out); - - prt_printf(out, "Oldest version on disk:"); - prt_tab(out); - bch2_version_to_text(out, le16_to_cpu(sb->version_min)); - prt_newline(out); - - prt_printf(out, "Created:"); - prt_tab(out); - if (sb->time_base_lo) - bch2_prt_datetime(out, div_u64(le64_to_cpu(sb->time_base_lo), NSEC_PER_SEC)); - else - prt_printf(out, "(not set)"); - prt_newline(out); - - prt_printf(out, "Sequence number:"); - prt_tab(out); - prt_printf(out, "%llu", le64_to_cpu(sb->seq)); - prt_newline(out); - - prt_printf(out, "Time of last write:"); - prt_tab(out); - bch2_prt_datetime(out, le64_to_cpu(sb->write_time)); - prt_newline(out); - - prt_printf(out, "Superblock size:"); - prt_tab(out); - prt_printf(out, "%zu", vstruct_bytes(sb)); - prt_newline(out); - - prt_printf(out, "Clean:"); - prt_tab(out); - prt_printf(out, "%llu", BCH_SB_CLEAN(sb)); - prt_newline(out); - - prt_printf(out, "Devices:"); - prt_tab(out); - prt_printf(out, "%u", nr_devices); - prt_newline(out); - - prt_printf(out, "Sections:"); - vstruct_for_each(sb, f) - fields_have |= 1 << le32_to_cpu(f->type); - prt_tab(out); - prt_bitflags(out, bch2_sb_fields, fields_have); - prt_newline(out); - - prt_printf(out, "Features:"); - prt_tab(out); - prt_bitflags(out, bch2_sb_features, le64_to_cpu(sb->features[0])); - prt_newline(out); - - prt_printf(out, "Compat features:"); - prt_tab(out); - prt_bitflags(out, bch2_sb_compat, le64_to_cpu(sb->compat[0])); - prt_newline(out); - - prt_newline(out); - prt_printf(out, "Options:"); - prt_newline(out); - printbuf_indent_add(out, 2); - { - enum bch_opt_id id; - - for (id = 0; id < bch2_opts_nr; id++) { - const struct bch_option *opt = bch2_opt_table + id; - - if (opt->get_sb != BCH2_NO_SB_OPT) { - u64 v = bch2_opt_from_sb(sb, id); - - prt_printf(out, "%s:", opt->attr.name); - prt_tab(out); - bch2_opt_to_text(out, NULL, sb, opt, v, - OPT_HUMAN_READABLE|OPT_SHOW_FULL_LIST); - prt_newline(out); - } - } - } - - printbuf_indent_sub(out, 2); - - if (print_layout) { - prt_newline(out); - prt_printf(out, "layout:"); - prt_newline(out); - printbuf_indent_add(out, 2); - bch2_sb_layout_to_text(out, &sb->layout); - printbuf_indent_sub(out, 2); - } - - vstruct_for_each(sb, f) - if (fields & (1 << le32_to_cpu(f->type))) { - prt_newline(out); - bch2_sb_field_to_text(out, sb, f); - } -} |