/* * Copyright (C) 2007 Oracle. All rights reserved. * * 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 "kerncompat.h" #include #include #include #include #include #include #include #include #include "kernel-lib/raid56.h" #include "kernel-shared/ctree.h" #include "kernel-shared/disk-io.h" #include "kernel-shared/transaction.h" #include "kernel-shared/volumes.h" #include "kernel-shared/tree-checker.h" #include "kernel-shared/zoned.h" #include "kernel-shared/accessors.h" #include "kernel-shared/extent_io.h" #include "kernel-shared/messages.h" #include "common/internal.h" #include "common/messages.h" #include "common/utils.h" #include "common/device-utils.h" const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = { [BTRFS_RAID_RAID10] = { .sub_stripes = 2, .dev_stripes = 1, .devs_max = 0, /* 0 == as many as possible */ .devs_min = 2, .tolerated_failures = 1, .devs_increment = 2, .ncopies = 2, .nparity = 0, .lower_name = "raid10", .upper_name = "RAID10", .bg_flag = BTRFS_BLOCK_GROUP_RAID10, .mindev_error = BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET, }, [BTRFS_RAID_RAID1] = { .sub_stripes = 1, .dev_stripes = 1, .devs_max = 2, .devs_min = 2, .tolerated_failures = 1, .devs_increment = 2, .ncopies = 2, .nparity = 0, .lower_name = "raid1", .upper_name = "RAID1", .bg_flag = BTRFS_BLOCK_GROUP_RAID1, .mindev_error = BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET, }, [BTRFS_RAID_RAID1C3] = { .sub_stripes = 1, .dev_stripes = 1, .devs_max = 3, .devs_min = 3, .tolerated_failures = 2, .devs_increment = 3, .ncopies = 3, .nparity = 0, .lower_name = "raid1c3", .upper_name = "RAID1C3", .bg_flag = BTRFS_BLOCK_GROUP_RAID1C3, .mindev_error = BTRFS_ERROR_DEV_RAID1C3_MIN_NOT_MET, }, [BTRFS_RAID_RAID1C4] = { .sub_stripes = 1, .dev_stripes = 1, .devs_max = 4, .devs_min = 4, .tolerated_failures = 3, .devs_increment = 4, .ncopies = 4, .nparity = 0, .lower_name = "raid1c4", .upper_name = "RAID1C4", .bg_flag = BTRFS_BLOCK_GROUP_RAID1C4, .mindev_error = BTRFS_ERROR_DEV_RAID1C4_MIN_NOT_MET, }, [BTRFS_RAID_DUP] = { .sub_stripes = 1, .dev_stripes = 2, .devs_max = 1, .devs_min = 1, .tolerated_failures = 0, .devs_increment = 1, .ncopies = 2, .nparity = 0, .lower_name = "dup", .upper_name = "DUP", .bg_flag = BTRFS_BLOCK_GROUP_DUP, .mindev_error = 0, }, [BTRFS_RAID_RAID0] = { .sub_stripes = 1, .dev_stripes = 1, .devs_max = 0, .devs_min = 1, .tolerated_failures = 0, .devs_increment = 1, .ncopies = 1, .nparity = 0, .lower_name = "raid0", .upper_name = "RAID0", .bg_flag = BTRFS_BLOCK_GROUP_RAID0, .mindev_error = 0, }, [BTRFS_RAID_SINGLE] = { .sub_stripes = 1, .dev_stripes = 1, .devs_max = 1, .devs_min = 1, .tolerated_failures = 0, .devs_increment = 1, .ncopies = 1, .nparity = 0, .lower_name = "single", /* * For historical reasons the single profile is lower case, this * may change some day. */ .upper_name = "single", .bg_flag = 0, .mindev_error = 0, }, [BTRFS_RAID_RAID5] = { .sub_stripes = 1, .dev_stripes = 1, .devs_max = 0, .devs_min = 2, .tolerated_failures = 1, .devs_increment = 1, .ncopies = 1, .nparity = 1, .lower_name = "raid5", .upper_name = "RAID5", .bg_flag = BTRFS_BLOCK_GROUP_RAID5, .mindev_error = BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET, }, [BTRFS_RAID_RAID6] = { .sub_stripes = 1, .dev_stripes = 1, .devs_max = 0, .devs_min = 3, .tolerated_failures = 2, .devs_increment = 1, .ncopies = 1, .nparity = 2, .lower_name = "raid6", .upper_name = "RAID6", .bg_flag = BTRFS_BLOCK_GROUP_RAID6, .mindev_error = BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET, }, }; struct alloc_chunk_ctl { u64 start; u64 type; int num_stripes; int max_stripes; int min_stripes; int sub_stripes; u64 stripe_size; u64 min_stripe_size; u64 num_bytes; u64 max_chunk_size; int total_devs; u64 dev_offset; int nparity; int ncopies; }; struct stripe { struct btrfs_device *dev; u64 physical; }; /* * Convert block group flags (BTRFS_BLOCK_GROUP_*) to btrfs_raid_types, which * can be used as index to access btrfs_raid_array[]. */ enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags) { if (flags & BTRFS_BLOCK_GROUP_RAID10) return BTRFS_RAID_RAID10; else if (flags & BTRFS_BLOCK_GROUP_RAID1) return BTRFS_RAID_RAID1; else if (flags & BTRFS_BLOCK_GROUP_RAID1C3) return BTRFS_RAID_RAID1C3; else if (flags & BTRFS_BLOCK_GROUP_RAID1C4) return BTRFS_RAID_RAID1C4; else if (flags & BTRFS_BLOCK_GROUP_DUP) return BTRFS_RAID_DUP; else if (flags & BTRFS_BLOCK_GROUP_RAID0) return BTRFS_RAID_RAID0; else if (flags & BTRFS_BLOCK_GROUP_RAID5) return BTRFS_RAID_RAID5; else if (flags & BTRFS_BLOCK_GROUP_RAID6) return BTRFS_RAID_RAID6; return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */ } const char *btrfs_bg_type_to_raid_name(u64 flags) { const int index = btrfs_bg_flags_to_raid_index(flags); if (index >= BTRFS_NR_RAID_TYPES) return NULL; return btrfs_raid_array[index].upper_name; } int btrfs_bg_type_to_tolerated_failures(u64 flags) { const int index = btrfs_bg_flags_to_raid_index(flags); return btrfs_raid_array[index].tolerated_failures; } int btrfs_bg_type_to_devs_min(u64 flags) { const int index = btrfs_bg_flags_to_raid_index(flags); return btrfs_raid_array[index].devs_min; } int btrfs_bg_type_to_ncopies(u64 flags) { const int index = btrfs_bg_flags_to_raid_index(flags); return btrfs_raid_array[index].ncopies; } int btrfs_bg_type_to_nparity(u64 flags) { const int index = btrfs_bg_flags_to_raid_index(flags); return btrfs_raid_array[index].nparity; } int btrfs_bg_type_to_sub_stripes(u64 flags) { const int index = btrfs_bg_flags_to_raid_index(flags); return btrfs_raid_array[index].sub_stripes; } /* * Number of stripes is not fixed and depends on the number of devices, * utilizing as many as possible (RAID0/RAID10/RAID5/RAID6/...). */ bool btrfs_bg_type_is_stripey(u64 flags) { const int index = btrfs_bg_flags_to_raid_index(flags); return btrfs_raid_array[index].devs_max == 0; } u64 btrfs_bg_flags_for_device_num(int number) { int i; u64 ret = 0; for (i = 0; i < ARRAY_SIZE(btrfs_raid_array); i++) { if (number >= btrfs_raid_array[i].devs_min) ret |= btrfs_raid_array[i].bg_flag; } return ret; } static inline int nr_data_stripes(struct map_lookup *map) { return map->num_stripes - btrfs_bg_type_to_nparity(map->type); } #define is_parity_stripe(x) ( ((x) == BTRFS_RAID5_P_STRIPE) || ((x) == BTRFS_RAID6_Q_STRIPE) ) static LIST_HEAD(fs_uuids); /* * Find a device specified by @devid or @uuid in the list of @fs_devices, or * return NULL. * * If devid and uuid are both specified, the match must be exact, otherwise * only devid is used. */ static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices, u64 devid, u8 *uuid) { struct list_head *head = &fs_devices->devices; struct btrfs_device *dev; list_for_each_entry(dev, head, dev_list) { if (dev->devid == devid && (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) { return dev; } } return NULL; } static struct btrfs_fs_devices *find_fsid(u8 *fsid, u8 *metadata_uuid) { struct btrfs_fs_devices *fs_devices; list_for_each_entry(fs_devices, &fs_uuids, fs_list) { if (metadata_uuid && (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0) && (memcmp(metadata_uuid, fs_devices->metadata_uuid, BTRFS_FSID_SIZE) == 0)) { return fs_devices; } else if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0){ return fs_devices; } } return NULL; } static u8 *btrfs_sb_fsid_ptr(struct btrfs_super_block *sb) { if (btrfs_super_incompat_flags(sb) & BTRFS_FEATURE_INCOMPAT_METADATA_UUID) return sb->metadata_uuid; else return sb->fsid; } static bool match_fsid_fs_devices(const struct btrfs_fs_devices *fs_devices, const u8 *fsid, const u8 *metadata_fsid) { if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) != 0) return false; if (!metadata_fsid) return true; if (memcmp(metadata_fsid, fs_devices->metadata_uuid, BTRFS_FSID_SIZE) != 0) return false; return true; } /* * First check if the metadata_uuid is different from the fsid in the given * fs_devices. Then check if the given fsid is the same as the metadata_uuid * in the fs_devices. If it is, return true; otherwise, return false. */ static inline bool check_fsid_changed(const struct btrfs_fs_devices *fs_devices, const u8 *fsid) { return memcmp(fs_devices->fsid, fs_devices->metadata_uuid, BTRFS_FSID_SIZE) != 0 && memcmp(fs_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE) == 0; } static struct btrfs_fs_devices *find_fsid_with_metadata_uuid( struct btrfs_super_block *disk_super) { struct btrfs_fs_devices *fs_devices; /* * Handle scanned device having completed its fsid change but belonging * to a fs_devices that was created by first scanning a device which * didn't have its fsid/metadata_uuid changed at all and the * CHANGING_FSID_V2 flag set. */ list_for_each_entry(fs_devices, &fs_uuids, fs_list) { if (!fs_devices->changing_fsid) continue; if (match_fsid_fs_devices(fs_devices, disk_super->metadata_uuid, fs_devices->fsid)) return fs_devices; } /* * Handle scanned device having completed its fsid change but belonging * to a fs_devices that was created by a device that has an outdated * pair of fsid/metadata_uuid and CHANGING_FSID_V2 flag set. */ list_for_each_entry(fs_devices, &fs_uuids, fs_list) { if (!fs_devices->changing_fsid) continue; if (check_fsid_changed(fs_devices, disk_super->metadata_uuid)) return fs_devices; } return find_fsid(disk_super->fsid, disk_super->metadata_uuid); } /* * Handle scanned device having its CHANGING_FSID_V2 flag set and the fs_devices * being created with a disk that has already completed its fsid change. Such * disk can belong to an fs which has its fsid changed or to one which doesn't. * Handle both cases here. */ static struct btrfs_fs_devices *find_fsid_inprogress(struct btrfs_super_block *disk_super) { struct btrfs_fs_devices *fs_devices; list_for_each_entry(fs_devices, &fs_uuids, fs_list) { if (fs_devices->changing_fsid) continue; if (check_fsid_changed(fs_devices, disk_super->fsid)) return fs_devices; } return find_fsid(disk_super->fsid, NULL); } static struct btrfs_fs_devices *find_fsid_changed(struct btrfs_super_block *disk_super) { struct btrfs_fs_devices *fs_devices; /* * Handle the case where scanned device is part of an fs that had * multiple successful changes of FSID but currently device didn't * observe it. Meaning our fsid will be different than theirs. We need * to handle two subcases : * * 1 - The fs still continues to have different METADATA/FSID uuids. * 2 - The fs is switched back to its original FSID (METADATA/FSID are equal). */ list_for_each_entry(fs_devices, &fs_uuids, fs_list) { /* Changed UUIDs. */ if (check_fsid_changed(fs_devices, disk_super->metadata_uuid) && memcmp(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE) != 0) return fs_devices; /* Unchanged UUIDs. */ if (memcmp(fs_devices->metadata_uuid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0 && memcmp(fs_devices->fsid, disk_super->metadata_uuid, BTRFS_FSID_SIZE) == 0) return fs_devices; } return NULL; } static struct btrfs_fs_devices *find_fsid_reverted_metadata(struct btrfs_super_block *disk_super) { struct btrfs_fs_devices *fs_devices; /* * Handle the case where the scanned device is part of an fs whose last * metadata UUID change reverted it to the original FSID. At the same * time fs_devices was first created by another constituent device * which didn't fully observe the operation. This results in an * btrfs_fs_devices created with metadata/fsid different AND * btrfs_fs_devices::fsid_change set AND the metadata_uuid of the * fs_devices equal to the FSID of the disk. */ list_for_each_entry(fs_devices, &fs_uuids, fs_list) { if (!fs_devices->changing_fsid) continue; if (check_fsid_changed(fs_devices, disk_super->fsid)) return fs_devices; } return NULL; } static int device_list_add(const char *path, struct btrfs_super_block *disk_super, struct btrfs_fs_devices **fs_devices_ret) { struct btrfs_device *device; struct btrfs_fs_devices *fs_devices; u64 found_transid = btrfs_super_generation(disk_super); u64 devid = btrfs_stack_device_id(&disk_super->dev_item); bool metadata_uuid = (btrfs_super_incompat_flags(disk_super) & BTRFS_FEATURE_INCOMPAT_METADATA_UUID); bool changing_fsid = (btrfs_super_flags(disk_super) & (BTRFS_SUPER_FLAG_CHANGING_FSID | BTRFS_SUPER_FLAG_CHANGING_FSID_V2)); if (changing_fsid) { if (!metadata_uuid) fs_devices = find_fsid_inprogress(disk_super); else fs_devices = find_fsid_changed(disk_super); } else if (metadata_uuid) { fs_devices = find_fsid_with_metadata_uuid(disk_super); } else { fs_devices = find_fsid_reverted_metadata(disk_super); if (!fs_devices) fs_devices = find_fsid(disk_super->fsid, NULL); } if (!fs_devices) { fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); if (!fs_devices) return -ENOMEM; INIT_LIST_HEAD(&fs_devices->devices); list_add(&fs_devices->fs_list, &fs_uuids); memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); if (metadata_uuid) memcpy(fs_devices->metadata_uuid, disk_super->metadata_uuid, BTRFS_FSID_SIZE); else memcpy(fs_devices->metadata_uuid, fs_devices->fsid, BTRFS_FSID_SIZE); fs_devices->latest_devid = devid; /* Below we would set this to found_transid */ fs_devices->latest_generation = 0; fs_devices->lowest_devid = (u64)-1; fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_REGULAR; device = NULL; } else { device = find_device(fs_devices, devid, disk_super->dev_item.uuid); /* * If this disk has been pulled into an fs devices created by * a device which had the CHANGING_FSID_V2 flag then replace the * metadata_uuid/fsid values of the fs_devices. */ if (fs_devices->changing_fsid && found_transid > fs_devices->latest_generation) { memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE); memcpy(fs_devices->metadata_uuid, btrfs_sb_fsid_ptr(disk_super), BTRFS_FSID_SIZE); } } if (!device) { device = kzalloc(sizeof(*device), GFP_NOFS); if (!device) { /* we can safely leave the fs_devices entry around */ return -ENOMEM; } device->fd = -1; device->devid = devid; device->generation = found_transid; memcpy(device->uuid, disk_super->dev_item.uuid, BTRFS_UUID_SIZE); device->name = kstrdup(path, GFP_NOFS); if (!device->name) { kfree(device); return -ENOMEM; } device->label = kstrdup(disk_super->label, GFP_NOFS); if (!device->label) { kfree(device->name); kfree(device); return -ENOMEM; } device->total_devs = btrfs_super_num_devices(disk_super); device->super_bytes_used = btrfs_super_bytes_used(disk_super); device->total_bytes = btrfs_stack_device_total_bytes(&disk_super->dev_item); device->bytes_used = btrfs_stack_device_bytes_used(&disk_super->dev_item); list_add(&device->dev_list, &fs_devices->devices); device->fs_devices = fs_devices; fs_devices->num_devices++; } else if (!device->name || strcmp(device->name, path)) { char *name; /* * The existing device has newer generation, so this one could * be a stale one, don't add it. */ if (found_transid < device->generation) { warning( "adding device %s gen %llu but found an existing device %s gen %llu", path, found_transid, device->name, device->generation); return -EEXIST; } name = strdup(path); if (!name) return -ENOMEM; kfree(device->name); device->name = name; } if (changing_fsid) fs_devices->inconsistent_super = changing_fsid; if (found_transid > fs_devices->latest_generation) { fs_devices->latest_devid = devid; fs_devices->latest_generation = found_transid; fs_devices->total_devices = device->total_devs; fs_devices->active_metadata_uuid = metadata_uuid; fs_devices->changing_fsid = changing_fsid; } if (fs_devices->lowest_devid > devid) { fs_devices->lowest_devid = devid; } *fs_devices_ret = fs_devices; return 0; } int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) { struct btrfs_fs_devices *seed_devices; struct btrfs_device *device; int ret = 0; again: if (!fs_devices) return 0; while (!list_empty(&fs_devices->devices)) { device = list_entry(fs_devices->devices.next, struct btrfs_device, dev_list); if (device->fd != -1) { if (device->writeable && fsync(device->fd) == -1) { warning("fsync on device %llu failed: %m", device->devid); ret = -errno; } if (posix_fadvise(device->fd, 0, 0, POSIX_FADV_DONTNEED)) fprintf(stderr, "Warning, could not drop caches\n"); close(device->fd); device->fd = -1; } device->writeable = 0; list_del(&device->dev_list); /* free the memory */ kfree(device->name); kfree(device->label); kfree(device->zone_info); kfree(device); } seed_devices = fs_devices->seed; fs_devices->seed = NULL; if (seed_devices) { struct btrfs_fs_devices *orig; orig = fs_devices; fs_devices = seed_devices; list_del(&orig->fs_list); kfree(orig); goto again; } else { list_del(&fs_devices->fs_list); kfree(fs_devices); } return ret; } void btrfs_close_all_devices(void) { struct btrfs_fs_devices *fs_devices; while (!list_empty(&fs_uuids)) { fs_devices = list_entry(fs_uuids.next, struct btrfs_fs_devices, fs_list); btrfs_close_devices(fs_devices); } } int btrfs_open_devices(struct btrfs_fs_info *fs_info, struct btrfs_fs_devices *fs_devices, int flags) { int fd; struct btrfs_device *device; int ret; list_for_each_entry(device, &fs_devices->devices, dev_list) { if (!device->fs_info) device->fs_info = fs_info; if (!device->name) { printk("no name for device %llu, skip it now\n", device->devid); continue; } if ((flags & O_RDWR) && zoned_model(device->name) == ZONED_HOST_MANAGED) flags |= O_DIRECT; fd = open(device->name, flags); if (fd < 0) { ret = -errno; error("cannot open device '%s': %m", device->name); goto fail; } if (posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED)) fprintf(stderr, "Warning, could not drop caches\n"); if (device->devid == fs_devices->latest_devid) fs_devices->latest_bdev = fd; if (device->devid == fs_devices->lowest_devid) fs_devices->lowest_bdev = fd; device->fd = fd; if (flags & O_RDWR) device->writeable = 1; } return 0; fail: btrfs_close_devices(fs_devices); return ret; } int btrfs_scan_one_device(int fd, const char *path, struct btrfs_fs_devices **fs_devices_ret, u64 *total_devs, u64 super_offset, unsigned sbflags) { struct btrfs_super_block disk_super; int ret; ret = btrfs_read_dev_super(fd, &disk_super, super_offset, sbflags); if (ret < 0) return -EIO; if (btrfs_super_flags(&disk_super) & BTRFS_SUPER_FLAG_METADUMP) *total_devs = 1; else *total_devs = btrfs_super_num_devices(&disk_super); ret = device_list_add(path, &disk_super, fs_devices_ret); return ret; } static u64 dev_extent_search_start(struct btrfs_device *device, u64 start) { u64 zone_size; switch (device->fs_devices->chunk_alloc_policy) { case BTRFS_CHUNK_ALLOC_REGULAR: /* * We don't want to overwrite the superblock on the drive nor * any area used by the boot loader (grub for example), so we * make sure to start at an offset of at least 1MB. */ return max(start, BTRFS_BLOCK_RESERVED_1M_FOR_SUPER); case BTRFS_CHUNK_ALLOC_ZONED: zone_size = device->zone_info->zone_size; return ALIGN(max_t(u64, start, zone_size), zone_size); default: BUG(); } } static bool dev_extent_hole_check_zoned(struct btrfs_device *device, u64 *hole_start, u64 *hole_size, u64 num_bytes) { u64 pos; ASSERT(IS_ALIGNED(*hole_start, device->zone_info->zone_size)); pos = btrfs_find_allocatable_zones(device, *hole_start, *hole_start + *hole_size, num_bytes); if (pos != *hole_start) { *hole_size = *hole_start + *hole_size - pos; *hole_start = pos; return true; } return false; } /** * Check if specified hole is suitable for allocation * * @device: the device which we have the hole * @hole_start: starting position of the hole * @hole_size: the size of the hole * @num_bytes: the size of the free space that we need * * This function may modify @hole_start and @hole_size to reflect the suitable * position for allocation. Returns true if hole position is updated, false * otherwise. */ static bool dev_extent_hole_check(struct btrfs_device *device, u64 *hole_start, u64 *hole_size, u64 num_bytes) { switch (device->fs_devices->chunk_alloc_policy) { case BTRFS_CHUNK_ALLOC_REGULAR: /* No check */ break; case BTRFS_CHUNK_ALLOC_ZONED: return dev_extent_hole_check_zoned(device, hole_start, hole_size, num_bytes); default: BUG(); } return false; } /* * find_free_dev_extent_start - find free space in the specified device * @device: the device which we search the free space in * @num_bytes: the size of the free space that we need * @search_start: the position from which to begin the search * @start: store the start of the free space. * @len: the size of the free space. that we find, or the size * of the max free space if we don't find suitable free space * * this uses a pretty simple search, the expectation is that it is * called very infrequently and that a given device has a small number * of extents * * @start is used to store the start of the free space if we find. But if we * don't find suitable free space, it will be used to store the start position * of the max free space. * * @len is used to store the size of the free space that we find. * But if we don't find suitable free space, it is used to store the size of * the max free space. */ static int find_free_dev_extent_start(struct btrfs_device *device, u64 num_bytes, u64 search_start, u64 *start, u64 *len) { struct btrfs_key key; struct btrfs_root *root = device->dev_root; struct btrfs_dev_extent *dev_extent; struct btrfs_path *path; u64 hole_size; u64 max_hole_start; u64 max_hole_size; u64 extent_end; u64 search_end = device->total_bytes; int ret; int slot; struct extent_buffer *l; u64 zone_size = 0; if (device->zone_info) zone_size = device->zone_info->zone_size; search_start = dev_extent_search_start(device, search_start); path = btrfs_alloc_path(); if (!path) return -ENOMEM; max_hole_start = search_start; max_hole_size = 0; again: if (search_start >= search_end) { ret = -ENOSPC; goto out; } path->reada = READA_FORWARD; key.objectid = device->devid; key.type = BTRFS_DEV_EXTENT_KEY; key.offset = search_start; ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto out; if (ret > 0) { ret = btrfs_previous_item(root, path, key.objectid, key.type); if (ret < 0) goto out; } while (1) { l = path->nodes[0]; slot = path->slots[0]; if (slot >= btrfs_header_nritems(l)) { ret = btrfs_next_leaf(root, path); if (ret == 0) continue; if (ret < 0) goto out; break; } btrfs_item_key_to_cpu(l, &key, slot); if (key.objectid < device->devid) goto next; if (key.objectid > device->devid) break; if (key.type != BTRFS_DEV_EXTENT_KEY) goto next; if (key.offset > search_start) { hole_size = key.offset - search_start; dev_extent_hole_check(device, &search_start, &hole_size, num_bytes); if (hole_size > max_hole_size) { max_hole_start = search_start; max_hole_size = hole_size; } /* * If this free space is greater than which we need, * it must be the max free space that we have found * until now, so max_hole_start must point to the start * of this free space and the length of this free space * is stored in max_hole_size. Thus, we return * max_hole_start and max_hole_size and go back to the * caller. */ if (hole_size >= num_bytes) { ret = 0; goto out; } } dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); extent_end = key.offset + btrfs_dev_extent_length(l, dev_extent); if (extent_end > search_start) search_start = extent_end; next: path->slots[0]++; cond_resched(); } /* * At this point, search_start should be the end of * allocated dev extents, and when shrinking the device, * search_end may be smaller than search_start. */ if (search_end > search_start) { hole_size = search_end - search_start; if (dev_extent_hole_check(device, &search_start, &hole_size, num_bytes)) { btrfs_release_path(path); goto again; } if (hole_size > max_hole_size) { max_hole_start = search_start; max_hole_size = hole_size; } } /* See above. */ if (max_hole_size < num_bytes) ret = -ENOSPC; else ret = 0; out: ASSERT(zone_size == 0 || IS_ALIGNED(max_hole_start, zone_size)); btrfs_free_path(path); *start = max_hole_start; if (len) *len = max_hole_size; return ret; } static int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes, u64 *start, u64 *len) { /* FIXME use last free of some kind */ return find_free_dev_extent_start(device, num_bytes, 0, start, len); } /* * Insert one device extent into the fs. */ int btrfs_insert_dev_extent(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 chunk_offset, u64 num_bytes, u64 start) { int ret; struct btrfs_path *path; struct btrfs_root *root = device->dev_root; struct btrfs_dev_extent *extent; struct extent_buffer *leaf; struct btrfs_key key; /* Check alignment to zone for a zoned block device */ ASSERT(!device->zone_info || device->zone_info->model != ZONED_HOST_MANAGED || IS_ALIGNED(start, device->zone_info->zone_size)); path = btrfs_alloc_path(); if (!path) return -ENOMEM; key.objectid = device->devid; key.type = BTRFS_DEV_EXTENT_KEY; key.offset = start; ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*extent)); if (ret < 0) goto err; leaf = path->nodes[0]; extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); btrfs_set_dev_extent_chunk_tree(leaf, extent, BTRFS_CHUNK_TREE_OBJECTID); btrfs_set_dev_extent_chunk_objectid(leaf, extent, BTRFS_FIRST_CHUNK_TREE_OBJECTID); btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent), BTRFS_UUID_SIZE); btrfs_set_dev_extent_length(leaf, extent, num_bytes); btrfs_mark_buffer_dirty(leaf); err: btrfs_free_path(path); return ret; } /* * Allocate one free dev extent and insert it into the fs. */ static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 chunk_offset, u64 num_bytes, u64 *start) { int ret; ret = find_free_dev_extent(device, num_bytes, start, NULL); if (ret) return ret; return btrfs_insert_dev_extent(trans, device, chunk_offset, num_bytes, *start); } static int find_next_chunk(struct btrfs_fs_info *fs_info, u64 *offset) { struct btrfs_root *root = fs_info->chunk_root; struct btrfs_path *path; int ret; struct btrfs_key key; struct btrfs_chunk *chunk; struct btrfs_key found_key; path = btrfs_alloc_path(); if (!path) return -ENOMEM; key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; key.type = BTRFS_CHUNK_ITEM_KEY; key.offset = (u64)-1; ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto error; BUG_ON(ret == 0); ret = btrfs_previous_item(root, path, 0, BTRFS_CHUNK_ITEM_KEY); if (ret) { *offset = 0; } else { btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); if (found_key.objectid != BTRFS_FIRST_CHUNK_TREE_OBJECTID) *offset = 0; else { chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], struct btrfs_chunk); *offset = found_key.offset + btrfs_chunk_length(path->nodes[0], chunk); } } ret = 0; error: btrfs_free_path(path); return ret; } static int find_next_devid(struct btrfs_root *root, struct btrfs_path *path, u64 *objectid) { int ret; struct btrfs_key key; struct btrfs_key found_key; key.objectid = BTRFS_DEV_ITEMS_OBJECTID; key.type = BTRFS_DEV_ITEM_KEY; key.offset = (u64)-1; ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto error; BUG_ON(ret == 0); ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID, BTRFS_DEV_ITEM_KEY); if (ret) { *objectid = 1; } else { btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); *objectid = found_key.offset + 1; } ret = 0; error: btrfs_release_path(path); return ret; } /* * the device information is stored in the chunk root * the btrfs_device struct should be fully filled in */ int btrfs_add_device(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info, struct btrfs_device *device) { int ret; struct btrfs_path *path; struct btrfs_dev_item *dev_item; struct extent_buffer *leaf; struct btrfs_key key; struct btrfs_root *root = fs_info->chunk_root; unsigned long ptr; u64 free_devid = 0; path = btrfs_alloc_path(); if (!path) return -ENOMEM; ret = find_next_devid(root, path, &free_devid); if (ret) goto out; key.objectid = BTRFS_DEV_ITEMS_OBJECTID; key.type = BTRFS_DEV_ITEM_KEY; key.offset = free_devid; ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*dev_item)); if (ret) goto out; leaf = path->nodes[0]; dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); device->devid = free_devid; btrfs_set_device_id(leaf, dev_item, device->devid); btrfs_set_device_generation(leaf, dev_item, 0); btrfs_set_device_type(leaf, dev_item, device->type); btrfs_set_device_io_align(leaf, dev_item, device->io_align); btrfs_set_device_io_width(leaf, dev_item, device->io_width); btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); btrfs_set_device_group(leaf, dev_item, 0); btrfs_set_device_seek_speed(leaf, dev_item, 0); btrfs_set_device_bandwidth(leaf, dev_item, 0); btrfs_set_device_start_offset(leaf, dev_item, 0); ptr = (unsigned long)btrfs_device_uuid(dev_item); write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); ptr = (unsigned long)btrfs_device_fsid(dev_item); write_extent_buffer(leaf, fs_info->fs_devices->metadata_uuid, ptr, BTRFS_UUID_SIZE); btrfs_mark_buffer_dirty(leaf); fs_info->fs_devices->total_rw_bytes += device->total_bytes; ret = 0; out: btrfs_free_path(path); return ret; } int btrfs_update_device(struct btrfs_trans_handle *trans, struct btrfs_device *device) { int ret; struct btrfs_path *path; struct btrfs_root *root; struct btrfs_dev_item *dev_item; struct extent_buffer *leaf; struct btrfs_key key; root = device->dev_root->fs_info->chunk_root; path = btrfs_alloc_path(); if (!path) return -ENOMEM; key.objectid = BTRFS_DEV_ITEMS_OBJECTID; key.type = BTRFS_DEV_ITEM_KEY; key.offset = device->devid; ret = btrfs_search_slot(trans, root, &key, path, 0, 1); if (ret < 0) goto out; if (ret > 0) { ret = -ENOENT; goto out; } leaf = path->nodes[0]; dev_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_item); btrfs_set_device_id(leaf, dev_item, device->devid); btrfs_set_device_type(leaf, dev_item, device->type); btrfs_set_device_io_align(leaf, dev_item, device->io_align); btrfs_set_device_io_width(leaf, dev_item, device->io_width); btrfs_set_device_sector_size(leaf, dev_item, device->sector_size); btrfs_set_device_total_bytes(leaf, dev_item, device->total_bytes); btrfs_set_device_bytes_used(leaf, dev_item, device->bytes_used); btrfs_mark_buffer_dirty(leaf); out: btrfs_free_path(path); return ret; } int btrfs_add_system_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key, struct btrfs_chunk *chunk, int item_size) { struct btrfs_super_block *super_copy = fs_info->super_copy; struct btrfs_disk_key disk_key; u32 array_size; u8 *ptr; array_size = btrfs_super_sys_array_size(super_copy); if (array_size + item_size + sizeof(disk_key) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) return -EFBIG; ptr = super_copy->sys_chunk_array + array_size; btrfs_cpu_key_to_disk(&disk_key, key); memcpy(ptr, &disk_key, sizeof(disk_key)); ptr += sizeof(disk_key); memcpy(ptr, chunk, item_size); item_size += sizeof(disk_key); btrfs_set_super_sys_array_size(super_copy, array_size + item_size); return 0; } static u64 chunk_bytes_by_type(struct alloc_chunk_ctl *ctl) { u64 type = ctl->type; u64 stripe_size = ctl->stripe_size; if (type & (BTRFS_BLOCK_GROUP_RAID1_MASK | BTRFS_BLOCK_GROUP_DUP)) return stripe_size; else if (type & BTRFS_BLOCK_GROUP_RAID10) return stripe_size * (ctl->num_stripes / ctl->sub_stripes); else if (type & BTRFS_BLOCK_GROUP_RAID56_MASK) return stripe_size * (ctl->num_stripes - btrfs_bg_type_to_nparity(type)); else return stripe_size * ctl->num_stripes; } /* * btrfs_device_avail_bytes - count bytes available for alloc_chunk * * It is not equal to "device->total_bytes - device->bytes_used". * We do not allocate any chunk in 1M at beginning of device, and not * allowed to allocate any chunk before alloc_start if it is specified. * So search holes from 1M to device->total_bytes. */ static int btrfs_device_avail_bytes(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 *avail_bytes) { struct btrfs_path *path; struct btrfs_root *root = device->dev_root; struct btrfs_key key; struct btrfs_dev_extent *dev_extent = NULL; struct extent_buffer *l; u64 search_start = BTRFS_BLOCK_RESERVED_1M_FOR_SUPER;; u64 search_end = device->total_bytes; u64 extent_end = 0; u64 free_bytes = 0; int ret; int slot = 0; path = btrfs_alloc_path(); if (!path) return -ENOMEM; key.objectid = device->devid; key.type = BTRFS_DEV_EXTENT_KEY; key.offset = search_start; path->reada = READA_FORWARD; ret = btrfs_search_slot(trans, root, &key, path, 0, 0); if (ret < 0) goto error; ret = btrfs_previous_item(root, path, 0, key.type); if (ret < 0) goto error; while (1) { l = path->nodes[0]; slot = path->slots[0]; if (slot >= btrfs_header_nritems(l)) { ret = btrfs_next_leaf(root, path); if (ret == 0) continue; if (ret < 0) goto error; break; } btrfs_item_key_to_cpu(l, &key, slot); if (key.objectid < device->devid) goto next; if (key.objectid > device->devid) break; if (key.type != BTRFS_DEV_EXTENT_KEY) goto next; if (key.offset > search_end) break; if (key.offset > search_start) free_bytes += key.offset - search_start; dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); extent_end = key.offset + btrfs_dev_extent_length(l, dev_extent); if (extent_end > search_start) search_start = extent_end; if (search_start > search_end) break; next: path->slots[0]++; cond_resched(); } if (search_start < search_end) free_bytes += search_end - search_start; *avail_bytes = free_bytes; ret = 0; error: btrfs_free_path(path); return ret; } #define BTRFS_MAX_DEVS(info) ((BTRFS_LEAF_DATA_SIZE(info) \ - sizeof(struct btrfs_item) \ - sizeof(struct btrfs_chunk)) \ / sizeof(struct btrfs_stripe) + 1) #define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ - 2 * sizeof(struct btrfs_disk_key) \ - 2 * sizeof(struct btrfs_chunk)) \ / sizeof(struct btrfs_stripe) + 1) static void init_alloc_chunk_ctl_policy_regular(struct btrfs_fs_info *info, struct alloc_chunk_ctl *ctl) { u64 type = ctl->type; u64 percent_max; if (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { if (type & BTRFS_BLOCK_GROUP_SYSTEM) { ctl->stripe_size = SZ_8M; ctl->max_chunk_size = ctl->stripe_size * 2; ctl->min_stripe_size = SZ_1M; ctl->max_stripes = BTRFS_MAX_DEVS_SYS_CHUNK; } else if (type & BTRFS_BLOCK_GROUP_DATA) { ctl->stripe_size = SZ_1G; ctl->max_chunk_size = 10 * ctl->stripe_size; ctl->min_stripe_size = SZ_64M; ctl->max_stripes = BTRFS_MAX_DEVS(info); } else if (type & BTRFS_BLOCK_GROUP_METADATA) { /* For larger filesystems, use larger metadata chunks */ if (info->fs_devices->total_rw_bytes > 50ULL * SZ_1G) ctl->max_chunk_size = SZ_1G; else ctl->max_chunk_size = SZ_256M; ctl->stripe_size = ctl->max_chunk_size; ctl->min_stripe_size = SZ_32M; ctl->max_stripes = BTRFS_MAX_DEVS(info); } } /* We don't want a chunk larger than 10% of the FS */ percent_max = div_factor(btrfs_super_total_bytes(info->super_copy), 1); ctl->max_chunk_size = min(percent_max, ctl->max_chunk_size); } static void init_alloc_chunk_ctl_policy_zoned(struct btrfs_fs_info *info, struct alloc_chunk_ctl *ctl) { u64 type = ctl->type; u64 zone_size = info->zone_size; int min_num_stripes = ctl->min_stripes * ctl->num_stripes; int min_data_stripes = (min_num_stripes - ctl->nparity) / ctl->ncopies; u64 min_chunk_size = min_data_stripes * zone_size; ctl->stripe_size = zone_size; ctl->min_stripe_size = zone_size; if (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { if (type & BTRFS_BLOCK_GROUP_SYSTEM) { ctl->max_chunk_size = SZ_16M; ctl->max_stripes = BTRFS_MAX_DEVS_SYS_CHUNK; } else if (type & BTRFS_BLOCK_GROUP_DATA) { ctl->max_chunk_size = 10ULL * SZ_1G; ctl->max_stripes = BTRFS_MAX_DEVS(info); } else if (type & BTRFS_BLOCK_GROUP_METADATA) { /* For larger filesystems, use larger metadata chunks */ if (info->fs_devices->total_rw_bytes > 50ULL * SZ_1G) ctl->max_chunk_size = SZ_1G; else ctl->max_chunk_size = SZ_256M; ctl->max_stripes = BTRFS_MAX_DEVS(info); } } ctl->max_chunk_size = round_down(ctl->max_chunk_size, zone_size); ctl->max_chunk_size = max(ctl->max_chunk_size, min_chunk_size); } static void init_alloc_chunk_ctl(struct btrfs_fs_info *info, struct alloc_chunk_ctl *ctl) { enum btrfs_raid_types type = btrfs_bg_flags_to_raid_index(ctl->type); ctl->num_stripes = btrfs_raid_array[type].dev_stripes; ctl->min_stripes = btrfs_raid_array[type].devs_min; ctl->max_stripes = 0; ctl->sub_stripes = btrfs_raid_array[type].sub_stripes; ctl->stripe_size = SZ_8M; ctl->min_stripe_size = SZ_1M; ctl->max_chunk_size = 4 * ctl->stripe_size; ctl->total_devs = btrfs_super_num_devices(info->super_copy); ctl->dev_offset = 0; ctl->nparity = btrfs_raid_array[type].nparity; ctl->ncopies = btrfs_raid_array[type].ncopies; switch (info->fs_devices->chunk_alloc_policy) { case BTRFS_CHUNK_ALLOC_REGULAR: init_alloc_chunk_ctl_policy_regular(info, ctl); break; case BTRFS_CHUNK_ALLOC_ZONED: init_alloc_chunk_ctl_policy_zoned(info, ctl); break; default: BUG(); } switch (type) { case BTRFS_RAID_DUP: ctl->min_stripes = 2; break; case BTRFS_RAID_RAID1: case BTRFS_RAID_RAID1C3: case BTRFS_RAID_RAID1C4: ctl->num_stripes = min(ctl->min_stripes, ctl->total_devs); break; case BTRFS_RAID_RAID0: case BTRFS_RAID_RAID10: case BTRFS_RAID_RAID5: case BTRFS_RAID_RAID6: ctl->num_stripes = min(ctl->max_stripes, ctl->total_devs); if (type == BTRFS_RAID_RAID10) ctl->num_stripes &= ~(u32)1; break; default: break; } } static int decide_stripe_size_regular(struct alloc_chunk_ctl *ctl) { if (chunk_bytes_by_type(ctl) > ctl->max_chunk_size) { ctl->stripe_size = ctl->max_chunk_size; ctl->stripe_size /= ctl->num_stripes; ctl->stripe_size = round_down(ctl->stripe_size, BTRFS_STRIPE_LEN); } /* We don't want tiny stripes */ ctl->stripe_size = max_t(u64, ctl->stripe_size, ctl->min_stripe_size); /* Align to the stripe length */ ctl->stripe_size = round_down(ctl->stripe_size, BTRFS_STRIPE_LEN); return 0; } static int decide_stripe_size_zoned(struct alloc_chunk_ctl *ctl) { if (chunk_bytes_by_type(ctl) > ctl->max_chunk_size) { /* stripe_size is fixed in ZONED, reduce num_stripes instead */ ctl->num_stripes = ctl->max_chunk_size * ctl->ncopies / ctl->stripe_size; if (ctl->num_stripes < ctl->min_stripes) return -ENOSPC; } return 0; } static int decide_stripe_size(struct btrfs_fs_info *info, struct alloc_chunk_ctl *ctl) { switch (info->fs_devices->chunk_alloc_policy) { case BTRFS_CHUNK_ALLOC_REGULAR: return decide_stripe_size_regular(ctl); case BTRFS_CHUNK_ALLOC_ZONED: return decide_stripe_size_zoned(ctl); default: BUG(); } } static int create_chunk(struct btrfs_trans_handle *trans, struct btrfs_fs_info *info, struct alloc_chunk_ctl *ctl, struct list_head *private_devs) { struct btrfs_root *chunk_root = info->chunk_root; struct btrfs_stripe *stripes; struct btrfs_device *device = NULL; struct btrfs_chunk *chunk; struct list_head *dev_list = &info->fs_devices->devices; struct list_head *cur; struct map_lookup *map; int ret; int index; struct btrfs_key key; u64 offset; u64 zone_size = info->zone_size; if (!ctl->start) { ret = find_next_chunk(info, &offset); if (ret) return ret; } else { offset = ctl->start; } key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; key.type = BTRFS_CHUNK_ITEM_KEY; key.offset = offset; chunk = kmalloc(btrfs_chunk_item_size(ctl->num_stripes), GFP_NOFS); if (!chunk) return -ENOMEM; map = kmalloc(btrfs_map_lookup_size(ctl->num_stripes), GFP_NOFS); if (!map) { kfree(chunk); return -ENOMEM; } stripes = &chunk->stripe; ctl->num_bytes = chunk_bytes_by_type(ctl); index = 0; while (index < ctl->num_stripes) { u64 dev_offset; struct btrfs_stripe *stripe; BUG_ON(list_empty(private_devs)); cur = private_devs->next; device = list_entry(cur, struct btrfs_device, dev_list); /* loop over this device again if we're doing a dup group */ if (!(ctl->type & BTRFS_BLOCK_GROUP_DUP) || (index == ctl->num_stripes - 1)) list_move(&device->dev_list, dev_list); if (!ctl->dev_offset) { ret = btrfs_alloc_dev_extent(trans, device, key.offset, ctl->stripe_size, &dev_offset); if (ret < 0) goto out_chunk_map; } else { dev_offset = ctl->dev_offset; ret = btrfs_insert_dev_extent(trans, device, key.offset, ctl->stripe_size, ctl->dev_offset); BUG_ON(ret); } ASSERT(!zone_size || IS_ALIGNED(dev_offset, zone_size)); device->bytes_used += ctl->stripe_size; ret = btrfs_update_device(trans, device); if (ret < 0) goto out_chunk_map; map->stripes[index].dev = device; map->stripes[index].physical = dev_offset; stripe = stripes + index; btrfs_set_stack_stripe_devid(stripe, device->devid); btrfs_set_stack_stripe_offset(stripe, dev_offset); memcpy(stripe->dev_uuid, device->uuid, BTRFS_UUID_SIZE); index++; } BUG_ON(!list_empty(private_devs)); /* key was set above */ btrfs_set_stack_chunk_length(chunk, ctl->num_bytes); btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID); btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN); btrfs_set_stack_chunk_type(chunk, ctl->type); btrfs_set_stack_chunk_num_stripes(chunk, ctl->num_stripes); btrfs_set_stack_chunk_io_align(chunk, BTRFS_STRIPE_LEN); btrfs_set_stack_chunk_io_width(chunk, BTRFS_STRIPE_LEN); btrfs_set_stack_chunk_sector_size(chunk, info->sectorsize); btrfs_set_stack_chunk_sub_stripes(chunk, ctl->sub_stripes); map->sector_size = info->sectorsize; map->stripe_len = BTRFS_STRIPE_LEN; map->io_align = BTRFS_STRIPE_LEN; map->io_width = BTRFS_STRIPE_LEN; map->type = ctl->type; map->num_stripes = ctl->num_stripes; map->sub_stripes = ctl->sub_stripes; ret = btrfs_insert_item(trans, chunk_root, &key, chunk, btrfs_chunk_item_size(ctl->num_stripes)); BUG_ON(ret); ctl->start = key.offset; map->ce.start = key.offset; map->ce.size = ctl->num_bytes; ret = insert_cache_extent(&info->mapping_tree.cache_tree, &map->ce); if (ret < 0) goto out_chunk_map; if (ctl->type & BTRFS_BLOCK_GROUP_SYSTEM) { ret = btrfs_add_system_chunk(info, &key, chunk, btrfs_chunk_item_size(ctl->num_stripes)); if (ret < 0) goto out_chunk; } kfree(chunk); return ret; out_chunk_map: kfree(map); out_chunk: kfree(chunk); return ret; } int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, struct btrfs_fs_info *info, u64 *start, u64 *num_bytes, u64 type) { struct btrfs_device *device = NULL; struct list_head private_devs; struct list_head *dev_list = &info->fs_devices->devices; struct list_head *cur; u64 min_free; u64 avail = 0; u64 max_avail = 0; struct alloc_chunk_ctl ctl; int looped = 0; int ret; int index; if (list_empty(dev_list)) return -ENOSPC; ctl.type = type; /* start and num_bytes will be set by create_chunk() */ ctl.start = 0; ctl.num_bytes = 0; init_alloc_chunk_ctl(info, &ctl); if (ctl.num_stripes < ctl.min_stripes) return -ENOSPC; again: ret = decide_stripe_size(info, &ctl); if (ret < 0) return ret; INIT_LIST_HEAD(&private_devs); cur = dev_list->next; index = 0; if (type & BTRFS_BLOCK_GROUP_DUP) min_free = ctl.stripe_size * 2; else min_free = ctl.stripe_size; /* Build a private list of devices we will allocate from */ while (index < ctl.num_stripes) { device = list_entry(cur, struct btrfs_device, dev_list); ret = btrfs_device_avail_bytes(trans, device, &avail); if (ret) return ret; cur = cur->next; if (avail >= min_free) { list_move(&device->dev_list, &private_devs); index++; if (type & BTRFS_BLOCK_GROUP_DUP) index++; } else if (avail > max_avail) max_avail = avail; if (cur == dev_list) break; } if (index < ctl.num_stripes) { list_splice(&private_devs, dev_list); if (index >= ctl.min_stripes) { ctl.num_stripes = index; if (type & (BTRFS_BLOCK_GROUP_RAID10)) { /* We know this should be 2, but just in case */ ASSERT(is_power_of_2(ctl.sub_stripes)); ctl.num_stripes = round_down(ctl.num_stripes, ctl.sub_stripes); } looped = 1; goto again; } if (!looped && max_avail > 0) { looped = 1; if (ctl.type & BTRFS_BLOCK_GROUP_DUP) ctl.stripe_size = max_avail / 2; else ctl.stripe_size = max_avail; goto again; } return -ENOSPC; } ret = create_chunk(trans, info, &ctl, &private_devs); /* * This can happen if above create_chunk() failed, we need to move all * devices back to dev_list. */ while (!list_empty(&private_devs)) { device = list_entry(private_devs.next, struct btrfs_device, dev_list); list_move(&device->dev_list, dev_list); } /* * All private devs moved back to @dev_list, now dev_list should not be * empty. */ ASSERT(!list_empty(dev_list)); *start = ctl.start; *num_bytes = ctl.num_bytes; return ret; } /* * Alloc a DATA chunk with SINGLE profile. * * It allocates a chunk with 1:1 mapping (btrfs logical bytenr == on-disk bytenr) * Caller must make sure the chunk and dev_extent are not occupied. */ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans, struct btrfs_fs_info *info, u64 *start, u64 num_bytes) { struct list_head *dev_list = &info->fs_devices->devices; struct list_head private_devs; struct btrfs_device *device; struct alloc_chunk_ctl ctl; if (*start != round_down(*start, info->sectorsize)) { error("DATA chunk start not sectorsize aligned: %llu", (unsigned long long)*start); return -EINVAL; } ctl.start = *start; ctl.type = BTRFS_BLOCK_GROUP_DATA; ctl.num_stripes = 1; ctl.max_stripes = 1; ctl.min_stripes = 1; ctl.sub_stripes = 1; ctl.stripe_size = num_bytes; ctl.min_stripe_size = num_bytes; ctl.num_bytes = num_bytes; ctl.max_chunk_size = num_bytes; ctl.total_devs = btrfs_super_num_devices(info->super_copy); ctl.dev_offset = *start; INIT_LIST_HEAD(&private_devs); /* Build a list containing one device */ device = list_entry(dev_list->next, struct btrfs_device, dev_list); list_move(&device->dev_list, &private_devs); return create_chunk(trans, info, &ctl, &private_devs); } int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len) { struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; struct cache_extent *ce; struct map_lookup *map; int ret; ce = search_cache_extent(&map_tree->cache_tree, logical); if (!ce) { fprintf(stderr, "No mapping for %llu-%llu\n", (unsigned long long)logical, (unsigned long long)logical+len); return 1; } if (ce->start > logical || ce->start + ce->size < logical) { fprintf(stderr, "Invalid mapping for %llu-%llu, got " "%llu-%llu\n", (unsigned long long)logical, (unsigned long long)logical+len, (unsigned long long)ce->start, (unsigned long long)ce->start + ce->size); return 1; } map = container_of(ce, struct map_lookup, ce); if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1_MASK)) ret = map->num_stripes; else if (map->type & BTRFS_BLOCK_GROUP_RAID10) ret = map->sub_stripes; else if (map->type & BTRFS_BLOCK_GROUP_RAID5) ret = 2; else if (map->type & BTRFS_BLOCK_GROUP_RAID6) ret = 3; else ret = 1; return ret; } int btrfs_next_bg(struct btrfs_fs_info *fs_info, u64 *logical, u64 *size, u64 type) { struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; struct cache_extent *ce; struct map_lookup *map; u64 cur = *logical; ce = search_cache_extent(&map_tree->cache_tree, cur); while (ce) { /* * only jump to next bg if our cur is not 0 * As the initial logical for btrfs_next_bg() is 0, and * if we jump to next bg, we skipped a valid bg. */ if (cur) { ce = next_cache_extent(ce); if (!ce) return -ENOENT; } cur = ce->start; map = container_of(ce, struct map_lookup, ce); if (map->type & type) { *logical = ce->start; *size = ce->size; return 0; } if (!cur) ce = next_cache_extent(ce); } return -ENOENT; } int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start, u64 physical, u64 **logical, int *naddrs, int *stripe_len) { struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; struct cache_extent *ce; struct map_lookup *map; u64 *buf; u64 bytenr; u64 length; u64 stripe_nr; u64 rmap_len; int i, j, nr = 0; ce = search_cache_extent(&map_tree->cache_tree, chunk_start); BUG_ON(!ce); map = container_of(ce, struct map_lookup, ce); length = ce->size; rmap_len = map->stripe_len; if (map->type & BTRFS_BLOCK_GROUP_RAID10) length = ce->size / (map->num_stripes / map->sub_stripes); else if (map->type & BTRFS_BLOCK_GROUP_RAID0) length = ce->size / map->num_stripes; else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { length = ce->size / nr_data_stripes(map); rmap_len = map->stripe_len * nr_data_stripes(map); } buf = kzalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); for (i = 0; i < map->num_stripes; i++) { if (map->stripes[i].physical > physical || map->stripes[i].physical + length <= physical) continue; stripe_nr = (physical - map->stripes[i].physical) / map->stripe_len; if (map->type & BTRFS_BLOCK_GROUP_RAID10) { stripe_nr = (stripe_nr * map->num_stripes + i) / map->sub_stripes; } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { stripe_nr = stripe_nr * map->num_stripes + i; } /* else if RAID[56], multiply by nr_data_stripes(). * Alternatively, just use rmap_len below instead of * map->stripe_len */ bytenr = ce->start + stripe_nr * rmap_len; for (j = 0; j < nr; j++) { if (buf[j] == bytenr) break; } if (j == nr) buf[nr++] = bytenr; } *logical = buf; *naddrs = nr; *stripe_len = rmap_len; return 0; } static inline int parity_smaller(u64 a, u64 b) { return a > b; } /* Bubble-sort the stripe set to put the parity/syndrome stripes last */ static void sort_parity_stripes(struct btrfs_multi_bio *bbio, u64 *raid_map) { struct btrfs_bio_stripe s; int i; u64 l; int again = 1; while (again) { again = 0; for (i = 0; i < bbio->num_stripes - 1; i++) { if (parity_smaller(raid_map[i], raid_map[i+1])) { s = bbio->stripes[i]; l = raid_map[i]; bbio->stripes[i] = bbio->stripes[i+1]; raid_map[i] = raid_map[i+1]; bbio->stripes[i+1] = s; raid_map[i+1] = l; again = 1; } } } } int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, u64 logical, u64 *length, struct btrfs_multi_bio **multi_ret, int mirror_num, u64 **raid_map_ret) { return __btrfs_map_block(fs_info, rw, logical, length, NULL, multi_ret, mirror_num, raid_map_ret); } static bool btrfs_need_stripe_tree_update(struct btrfs_fs_info *fs_info, u64 map_type) { #if EXPERIMENTAL const bool is_data = (map_type & BTRFS_BLOCK_GROUP_DATA); if (!btrfs_fs_incompat(fs_info, RAID_STRIPE_TREE)) return false; if (!fs_info->stripe_root) return false; if (!is_data) return false; if (map_type & BTRFS_BLOCK_GROUP_DUP) return true; if (map_type & BTRFS_BLOCK_GROUP_RAID1_MASK) return true; if (map_type & BTRFS_BLOCK_GROUP_RAID0) return true; if (map_type & BTRFS_BLOCK_GROUP_RAID10) return true; #endif return false; } static int btrfs_stripe_tree_logical_to_physical(struct btrfs_fs_info *fs_info, u64 logical, struct btrfs_bio_stripe *stripe) { struct btrfs_root *root = fs_info->stripe_root; struct btrfs_path path = { 0 }; struct btrfs_key key; struct extent_buffer *leaf; int slot; int ret; key.objectid = logical; key.type = BTRFS_RAID_STRIPE_KEY; key.offset = 0; ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); if (ret < 0) return ret; while (1) { struct btrfs_key found_key; struct btrfs_stripe_extent *extent; int num_stripes; u32 item_size; leaf = path.nodes[0]; slot = path.slots[0]; if (slot >= btrfs_header_nritems(leaf)) { ret = btrfs_next_leaf(root, &path); if (ret == 0) continue; if (ret < 0) goto error; break; } btrfs_item_key_to_cpu(leaf, &found_key, slot); if (found_key.type != BTRFS_RAID_STRIPE_KEY) goto next; extent = btrfs_item_ptr(leaf, slot, struct btrfs_stripe_extent); item_size = btrfs_item_size(leaf, slot); num_stripes = (item_size - offsetof(struct btrfs_stripe_extent, strides)) / sizeof(struct btrfs_raid_stride); for (int i = 0; i < num_stripes; i++) { if (stripe->dev->devid != btrfs_raid_stride_devid_nr(leaf, extent, i)) continue; stripe->physical = btrfs_raid_stride_offset_nr(leaf, extent, i); btrfs_release_path(&path); return 0; } next: path.slots[0]++; } btrfs_release_path(&path); error: return ret; } int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw, u64 logical, u64 *length, u64 *type, struct btrfs_multi_bio **multi_ret, int mirror_num, u64 **raid_map_ret) { struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; struct cache_extent *ce; struct map_lookup *map; u64 offset; u64 stripe_offset; u64 stripe_nr; u64 *raid_map = NULL; int stripes_allocated = 8; int stripes_required = 1; int stripe_index; int i; bool need_raid_map = false; struct btrfs_multi_bio *multi = NULL; if (multi_ret && rw == READ) { stripes_allocated = 1; } again: ce = search_cache_extent(&map_tree->cache_tree, logical); if (!ce) { kfree(multi); *length = (u64)-1; return -ENOENT; } if (ce->start > logical) { kfree(multi); *length = ce->start - logical; return -ENOENT; } if (multi_ret) { multi = kzalloc(btrfs_multi_bio_size(stripes_allocated), GFP_NOFS); if (!multi) return -ENOMEM; } map = container_of(ce, struct map_lookup, ce); offset = logical - ce->start; if (rw == WRITE) { if (map->type & (BTRFS_BLOCK_GROUP_RAID1_MASK | BTRFS_BLOCK_GROUP_DUP)) { stripes_required = map->num_stripes; } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { stripes_required = map->sub_stripes; } } if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK && multi_ret && ((rw & WRITE) || mirror_num > 1) && raid_map_ret) { need_raid_map = true; /* RAID[56] write or recovery. Return all stripes */ stripes_required = map->num_stripes; /* Only allocate the map if we've already got a large enough multi_ret */ if (stripes_allocated >= stripes_required) { raid_map = kmalloc(sizeof(u64) * map->num_stripes, GFP_NOFS); if (!raid_map) { kfree(multi); return -ENOMEM; } } } /* if our multi bio struct is too small, back off and try again */ if (multi_ret && stripes_allocated < stripes_required) { stripes_allocated = stripes_required; kfree(multi); multi = NULL; goto again; } stripe_nr = offset; /* * stripe_nr counts the total number of stripes we have to stride * to get to this block */ stripe_nr = stripe_nr / map->stripe_len; stripe_offset = stripe_nr * map->stripe_len; BUG_ON(offset < stripe_offset); /* stripe_offset is the offset of this block in its stripe*/ stripe_offset = offset - stripe_offset; if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1_MASK | BTRFS_BLOCK_GROUP_RAID56_MASK | BTRFS_BLOCK_GROUP_RAID10 | BTRFS_BLOCK_GROUP_DUP)) { /* we limit the length of each bio to what fits in a stripe */ *length = min_t(u64, ce->size - offset, map->stripe_len - stripe_offset); } else { *length = ce->size - offset; } if (!multi_ret) goto out; multi->num_stripes = 1; multi->type = map->type; stripe_index = 0; if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) { if (rw == WRITE) multi->num_stripes = map->num_stripes; else if (mirror_num) stripe_index = mirror_num - 1; else stripe_index = stripe_nr % map->num_stripes; } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { int factor = map->num_stripes / map->sub_stripes; stripe_index = stripe_nr % factor; stripe_index *= map->sub_stripes; if (rw == WRITE) multi->num_stripes = map->sub_stripes; else if (mirror_num) stripe_index += mirror_num - 1; stripe_nr = stripe_nr / factor; } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { if (rw == WRITE) multi->num_stripes = map->num_stripes; else if (mirror_num) stripe_index = mirror_num - 1; } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) { if (need_raid_map && raid_map) { int rot; u64 tmp; u64 raid56_full_stripe_start; u64 full_stripe_len = nr_data_stripes(map) * map->stripe_len; /* * align the start of our data stripe in the logical * address space */ raid56_full_stripe_start = offset / full_stripe_len; raid56_full_stripe_start *= full_stripe_len; /* get the data stripe number */ stripe_nr = raid56_full_stripe_start / map->stripe_len; stripe_nr = stripe_nr / nr_data_stripes(map); /* Work out the disk rotation on this stripe-set */ rot = stripe_nr % map->num_stripes; /* Fill in the logical address of each stripe */ tmp = stripe_nr * nr_data_stripes(map); for (i = 0; i < nr_data_stripes(map); i++) raid_map[(i+rot) % map->num_stripes] = ce->start + (tmp + i) * map->stripe_len; raid_map[(i+rot) % map->num_stripes] = BTRFS_RAID5_P_STRIPE; if (map->type & BTRFS_BLOCK_GROUP_RAID6) raid_map[(i+rot+1) % map->num_stripes] = BTRFS_RAID6_Q_STRIPE; *length = map->stripe_len; stripe_index = 0; stripe_offset = 0; multi->num_stripes = map->num_stripes; } else { stripe_index = stripe_nr % nr_data_stripes(map); stripe_nr = stripe_nr / nr_data_stripes(map); /* * Mirror #0 or #1 means the original data block. * Mirror #2 is RAID5 parity block. * Mirror #3 is RAID6 Q block. */ if (mirror_num > 1) stripe_index = nr_data_stripes(map) + mirror_num - 2; /* We distribute the parity blocks across stripes */ stripe_index = (stripe_nr + stripe_index) % map->num_stripes; } } else { /* * after this do_div call, stripe_nr is the number of stripes * on this device we have to walk to find the data, and * stripe_index is the number of our device in the stripe array */ stripe_index = stripe_nr % map->num_stripes; stripe_nr = stripe_nr / map->num_stripes; } BUG_ON(stripe_index >= map->num_stripes); for (i = 0; i < multi->num_stripes; i++) { multi->stripes[i].dev = map->stripes[stripe_index].dev; if (stripes_allocated && btrfs_need_stripe_tree_update(fs_info, map->type)) { int ret; ret = btrfs_stripe_tree_logical_to_physical(fs_info, logical, &multi->stripes[i]); if (ret) return ret; } else { multi->stripes[i].physical = map->stripes[stripe_index].physical + stripe_offset + stripe_nr * map->stripe_len; } stripe_index++; } *multi_ret = multi; if (type) *type = map->type; if (raid_map) { sort_parity_stripes(multi, raid_map); *raid_map_ret = raid_map; } out: return 0; } struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid, u8 *uuid, u8 *fsid) { struct btrfs_device *device; struct btrfs_fs_devices *cur_devices; cur_devices = fs_info->fs_devices; while (cur_devices) { if (!fsid || (!memcmp(cur_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE) || fs_info->ignore_fsid_mismatch)) { device = find_device(cur_devices, devid, uuid); if (device) return device; } cur_devices = cur_devices->seed; } return NULL; } struct btrfs_device * btrfs_find_device_by_devid(struct btrfs_fs_devices *fs_devices, u64 devid, int instance) { struct list_head *head = &fs_devices->devices; struct btrfs_device *dev; int num_found = 0; list_for_each_entry(dev, head, dev_list) { if (dev->devid == devid && num_found++ == instance) return dev; } return NULL; } /* * Return 0 if the chunk at @chunk_offset exists and is not read-only. * Return 1 if the chunk at @chunk_offset exists and is read-only. * Return <0 if we can't find chunk at @chunk_offset. */ int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset) { struct cache_extent *ce; struct map_lookup *map; struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; int readonly = 0; int i; /* * During chunk recovering, we may fail to find block group's * corresponding chunk, we will rebuild it later */ if (fs_info->is_chunk_recover) return 0; ce = search_cache_extent(&map_tree->cache_tree, chunk_offset); if (!ce) return -ENOENT; map = container_of(ce, struct map_lookup, ce); for (i = 0; i < map->num_stripes; i++) { if (!map->stripes[i].dev->writeable) { readonly = 1; break; } } return readonly; } static struct btrfs_device *fill_missing_device(u64 devid, const u8 *uuid) { struct btrfs_device *device; device = kzalloc(sizeof(*device), GFP_NOFS); device->devid = devid; memcpy(device->uuid, uuid, BTRFS_UUID_SIZE); device->fd = -1; return device; } /* * Slot is used to verify the chunk item is valid * * For sys chunk in superblock, pass -1 to indicate sys chunk. */ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key, struct extent_buffer *leaf, struct btrfs_chunk *chunk, int slot) { struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; struct map_lookup *map; struct cache_extent *ce; u64 logical; u64 length; u64 devid; u8 uuid[BTRFS_UUID_SIZE]; int num_stripes; int ret; int i; logical = key->offset; length = btrfs_chunk_length(leaf, chunk); num_stripes = btrfs_chunk_num_stripes(leaf, chunk); /* Validation check */ ret = btrfs_check_chunk_valid(leaf, chunk, logical); if (ret) { error("%s checksums match, but it has an invalid chunk, %s", (slot == -1) ? "Superblock" : "Metadata", (slot == -1) ? "try btrfsck --repair -s ie, 0,1,2" : ""); return ret; } ce = search_cache_extent(&map_tree->cache_tree, logical); /* already mapped? */ if (ce && ce->start <= logical && ce->start + ce->size > logical) { return 0; } map = kmalloc(btrfs_map_lookup_size(num_stripes), GFP_NOFS); if (!map) return -ENOMEM; map->ce.start = logical; map->ce.size = length; map->num_stripes = num_stripes; map->io_width = btrfs_chunk_io_width(leaf, chunk); map->io_align = btrfs_chunk_io_align(leaf, chunk); map->sector_size = btrfs_chunk_sector_size(leaf, chunk); map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk); map->type = btrfs_chunk_type(leaf, chunk); map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); for (i = 0; i < num_stripes; i++) { map->stripes[i].physical = btrfs_stripe_offset_nr(leaf, chunk, i); devid = btrfs_stripe_devid_nr(leaf, chunk, i); read_extent_buffer(leaf, uuid, (unsigned long) btrfs_stripe_dev_uuid_nr(chunk, i), BTRFS_UUID_SIZE); map->stripes[i].dev = btrfs_find_device(fs_info, devid, uuid, NULL); if (!map->stripes[i].dev) { map->stripes[i].dev = fill_missing_device(devid, uuid); printf("warning, device %llu is missing\n", (unsigned long long)devid); list_add(&map->stripes[i].dev->dev_list, &fs_info->fs_devices->devices); fs_info->fs_devices->missing_devices++; } } ret = insert_cache_extent(&map_tree->cache_tree, &map->ce); if (ret < 0) { errno = -ret; error("failed to add chunk map start=%llu len=%llu: %d (%m)", map->ce.start, map->ce.size, ret); } return ret; } static int fill_device_from_item(struct extent_buffer *leaf, struct btrfs_dev_item *dev_item, struct btrfs_device *device) { unsigned long ptr; device->devid = btrfs_device_id(leaf, dev_item); device->total_bytes = btrfs_device_total_bytes(leaf, dev_item); device->bytes_used = btrfs_device_bytes_used(leaf, dev_item); device->type = btrfs_device_type(leaf, dev_item); device->io_align = btrfs_device_io_align(leaf, dev_item); device->io_width = btrfs_device_io_width(leaf, dev_item); device->sector_size = btrfs_device_sector_size(leaf, dev_item); ptr = (unsigned long)btrfs_device_uuid(dev_item); read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE); return 0; } static int open_seed_devices(struct btrfs_fs_info *fs_info, u8 *fsid) { struct btrfs_fs_devices *fs_devices; int ret; fs_devices = fs_info->fs_devices->seed; while (fs_devices) { if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE)) { ret = 0; goto out; } fs_devices = fs_devices->seed; } fs_devices = find_fsid(fsid, NULL); if (!fs_devices) { /* missing all seed devices */ fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS); if (!fs_devices) { ret = -ENOMEM; goto out; } INIT_LIST_HEAD(&fs_devices->devices); list_add(&fs_devices->fs_list, &fs_uuids); memcpy(fs_devices->fsid, fsid, BTRFS_FSID_SIZE); } ret = btrfs_open_devices(fs_info, fs_devices, O_RDONLY); if (ret) goto out; fs_devices->seed = fs_info->fs_devices->seed; fs_info->fs_devices->seed = fs_devices; out: return ret; } static int read_one_dev(struct btrfs_fs_info *fs_info, struct extent_buffer *leaf, struct btrfs_dev_item *dev_item) { struct btrfs_device *device; u64 devid; int ret = 0; u8 fs_uuid[BTRFS_UUID_SIZE]; u8 dev_uuid[BTRFS_UUID_SIZE]; devid = btrfs_device_id(leaf, dev_item); read_extent_buffer(leaf, dev_uuid, (unsigned long)btrfs_device_uuid(dev_item), BTRFS_UUID_SIZE); read_extent_buffer(leaf, fs_uuid, (unsigned long)btrfs_device_fsid(dev_item), BTRFS_FSID_SIZE); if (memcmp(fs_uuid, fs_info->fs_devices->fsid, BTRFS_UUID_SIZE)) { ret = open_seed_devices(fs_info, fs_uuid); if (ret) return ret; } device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid); if (!device) { device = kzalloc(sizeof(*device), GFP_NOFS); if (!device) return -ENOMEM; device->fd = -1; list_add(&device->dev_list, &fs_info->fs_devices->devices); fs_info->fs_devices->missing_devices++; } fill_device_from_item(leaf, dev_item, device); device->dev_root = fs_info->dev_root; fs_info->fs_devices->total_rw_bytes += btrfs_device_total_bytes(leaf, dev_item); return ret; } int btrfs_read_sys_array(struct btrfs_fs_info *fs_info) { struct btrfs_super_block *super_copy = fs_info->super_copy; struct extent_buffer *sb; struct btrfs_disk_key *disk_key; struct btrfs_chunk *chunk; u8 *array_ptr; unsigned long sb_array_offset; int ret = 0; u32 num_stripes; u32 array_size; u32 len = 0; u32 cur_offset; struct btrfs_key key; if (fs_info->nodesize < BTRFS_SUPER_INFO_SIZE) { printf("ERROR: nodesize %u too small to read superblock\n", fs_info->nodesize); return -EINVAL; } sb = alloc_dummy_extent_buffer(fs_info, BTRFS_SUPER_INFO_OFFSET, BTRFS_SUPER_INFO_SIZE); if (!sb) return -ENOMEM; btrfs_set_buffer_uptodate(sb); write_extent_buffer(sb, super_copy, 0, sizeof(*super_copy)); array_size = btrfs_super_sys_array_size(super_copy); array_ptr = super_copy->sys_chunk_array; sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array); cur_offset = 0; while (cur_offset < array_size) { disk_key = (struct btrfs_disk_key *)array_ptr; len = sizeof(*disk_key); if (cur_offset + len > array_size) goto out_short_read; btrfs_disk_key_to_cpu(&key, disk_key); array_ptr += len; sb_array_offset += len; cur_offset += len; if (key.type == BTRFS_CHUNK_ITEM_KEY) { chunk = (struct btrfs_chunk *)sb_array_offset; /* * At least one btrfs_chunk with one stripe must be * present, exact stripe count check comes afterwards */ len = btrfs_chunk_item_size(1); if (cur_offset + len > array_size) goto out_short_read; num_stripes = btrfs_chunk_num_stripes(sb, chunk); if (!num_stripes) { printk( "ERROR: invalid number of stripes %u in sys_array at offset %u\n", num_stripes, cur_offset); ret = -EIO; break; } len = btrfs_chunk_item_size(num_stripes); if (cur_offset + len > array_size) goto out_short_read; ret = read_one_chunk(fs_info, &key, sb, chunk, -1); if (ret) break; } else { printk( "ERROR: unexpected item type %u in sys_array at offset %u\n", (u32)key.type, cur_offset); ret = -EIO; break; } array_ptr += len; sb_array_offset += len; cur_offset += len; } free_extent_buffer(sb); return ret; out_short_read: printk("ERROR: sys_array too short to read %u bytes at offset %u\n", len, cur_offset); free_extent_buffer(sb); return -EIO; } int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info) { struct btrfs_path *path; struct extent_buffer *leaf; struct btrfs_key key; struct btrfs_key found_key; struct btrfs_root *root = fs_info->chunk_root; int ret; int slot; path = btrfs_alloc_path(); if (!path) return -ENOMEM; /* * Read all device items, and then all the chunk items. All * device items are found before any chunk item (their object id * is smaller than the lowest possible object id for a chunk * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID). */ key.objectid = BTRFS_DEV_ITEMS_OBJECTID; key.type = 0; key.offset = 0; ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto error; while(1) { leaf = path->nodes[0]; slot = path->slots[0]; if (slot >= btrfs_header_nritems(leaf)) { ret = btrfs_next_leaf(root, path); if (ret == 0) continue; if (ret < 0) goto error; break; } btrfs_item_key_to_cpu(leaf, &found_key, slot); if (found_key.type == BTRFS_DEV_ITEM_KEY) { struct btrfs_dev_item *dev_item; dev_item = btrfs_item_ptr(leaf, slot, struct btrfs_dev_item); ret = read_one_dev(fs_info, leaf, dev_item); if (ret < 0) goto error; } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) { struct btrfs_chunk *chunk; chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); ret = read_one_chunk(fs_info, &found_key, leaf, chunk, slot); if (ret < 0) goto error; } path->slots[0]++; } ret = 0; error: btrfs_free_path(path); return ret; } struct list_head *btrfs_scanned_uuids(void) { return &fs_uuids; } static int rmw_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, struct extent_buffer *orig_eb) { int ret; unsigned long orig_off = 0; unsigned long dest_off = 0; unsigned long copy_len = eb->len; ret = read_whole_eb(info, eb, 0); if (ret) return ret; if (eb->start + eb->len <= orig_eb->start || eb->start >= orig_eb->start + orig_eb->len) return 0; /* * | ----- orig_eb ------- | * | ----- stripe ------- | * | ----- orig_eb ------- | * | ----- orig_eb ------- | */ if (eb->start > orig_eb->start) orig_off = eb->start - orig_eb->start; if (orig_eb->start > eb->start) dest_off = orig_eb->start - eb->start; if (copy_len > orig_eb->len - orig_off) copy_len = orig_eb->len - orig_off; if (copy_len > eb->len - dest_off) copy_len = eb->len - dest_off; memcpy(eb->data + dest_off, orig_eb->data + orig_off, copy_len); return 0; } static int split_eb_for_raid56(struct btrfs_fs_info *info, struct extent_buffer *orig_eb, struct extent_buffer **ebs, u64 stripe_len, u64 *raid_map, int num_stripes) { struct extent_buffer **tmp_ebs; u64 start = orig_eb->start; u64 this_eb_start; int i; int ret = 0; tmp_ebs = calloc(num_stripes, sizeof(*tmp_ebs)); if (!tmp_ebs) return -ENOMEM; /* Alloc memory in a row for data stripes */ for (i = 0; i < num_stripes; i++) { if (raid_map[i] >= BTRFS_RAID5_P_STRIPE) break; tmp_ebs[i] = calloc(1, sizeof(**tmp_ebs) + stripe_len); if (!tmp_ebs[i]) { ret = -ENOMEM; goto clean_up; } } for (i = 0; i < num_stripes; i++) { struct extent_buffer *eb = tmp_ebs[i]; if (raid_map[i] >= BTRFS_RAID5_P_STRIPE) break; eb->start = raid_map[i]; eb->len = stripe_len; eb->refs = 1; eb->flags = 0; eb->fs_info = info; this_eb_start = raid_map[i]; if (start > this_eb_start || start + orig_eb->len < this_eb_start + stripe_len) { ret = rmw_eb(info, eb, orig_eb); if (ret) goto clean_up; } else { memcpy(eb->data, orig_eb->data + eb->start - start, stripe_len); } ebs[i] = eb; } kfree(tmp_ebs); return ret; clean_up: for (i = 0; i < num_stripes; i++) kfree(tmp_ebs[i]); kfree(tmp_ebs); return ret; } int write_raid56_with_parity(struct btrfs_fs_info *info, struct extent_buffer *eb, struct btrfs_multi_bio *multi, u64 stripe_len, u64 *raid_map) { struct extent_buffer **ebs, *p_eb = NULL, *q_eb = NULL; int i; int ret; int alloc_size = eb->len; void **pointers; ebs = kmalloc(sizeof(*ebs) * multi->num_stripes, GFP_KERNEL); pointers = kmalloc(sizeof(*pointers) * multi->num_stripes, GFP_KERNEL); if (!ebs || !pointers) { kfree(ebs); kfree(pointers); return -ENOMEM; } if (stripe_len > alloc_size) alloc_size = stripe_len; ret = split_eb_for_raid56(info, eb, ebs, stripe_len, raid_map, multi->num_stripes); if (ret) goto out; for (i = 0; i < multi->num_stripes; i++) { struct extent_buffer *new_eb; if (raid_map[i] < BTRFS_RAID5_P_STRIPE) { if (ebs[i]->start != raid_map[i]) { ret = -EINVAL; goto out_free_split; } continue; } new_eb = kmalloc(sizeof(*eb) + alloc_size, GFP_KERNEL); if (!new_eb) { ret = -ENOMEM; goto out_free_split; } multi->stripes[i].dev->total_ios++; new_eb->len = stripe_len; new_eb->fs_info = info; if (raid_map[i] == BTRFS_RAID5_P_STRIPE) p_eb = new_eb; else if (raid_map[i] == BTRFS_RAID6_Q_STRIPE) q_eb = new_eb; } if (q_eb) { ebs[multi->num_stripes - 2] = p_eb; ebs[multi->num_stripes - 1] = q_eb; for (i = 0; i < multi->num_stripes; i++) pointers[i] = ebs[i]->data; raid6_gen_syndrome(multi->num_stripes, stripe_len, pointers); } else { ebs[multi->num_stripes - 1] = p_eb; for (i = 0; i < multi->num_stripes; i++) pointers[i] = ebs[i]->data; ret = raid5_gen_result(multi->num_stripes, stripe_len, multi->num_stripes - 1, pointers); if (ret < 0) goto out_free_split; } for (i = 0; i < multi->num_stripes; i++) { multi->stripes[i].dev->total_ios++; ret = btrfs_pwrite(multi->stripes[i].dev->fd, ebs[i]->data, ebs[i]->len, multi->stripes[i].physical, info->zoned); if (ret < 0) goto out_free_split; } out_free_split: for (i = 0; i < multi->num_stripes; i++) { if (ebs[i] != eb) kfree(ebs[i]); } out: kfree(ebs); kfree(pointers); return ret; } /* * Get stripe length from chunk item and its stripe items * * Caller should only call this function after validating the chunk item * by using btrfs_check_chunk_valid(). */ u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info, struct extent_buffer *leaf, struct btrfs_chunk *chunk) { u64 stripe_len; u64 chunk_len; u32 num_stripes = btrfs_chunk_num_stripes(leaf, chunk); u64 profile = btrfs_chunk_type(leaf, chunk) & BTRFS_BLOCK_GROUP_PROFILE_MASK; chunk_len = btrfs_chunk_length(leaf, chunk); stripe_len = chunk_len; switch (profile) { case 0: /* Single profile */ case BTRFS_BLOCK_GROUP_RAID1: case BTRFS_BLOCK_GROUP_RAID1C3: case BTRFS_BLOCK_GROUP_RAID1C4: case BTRFS_BLOCK_GROUP_DUP: /* The default value is already fine. */ break; case BTRFS_BLOCK_GROUP_RAID0: stripe_len = chunk_len / num_stripes; break; case BTRFS_BLOCK_GROUP_RAID5: case BTRFS_BLOCK_GROUP_RAID6: stripe_len = chunk_len / (num_stripes - btrfs_bg_type_to_nparity(profile)); break; case BTRFS_BLOCK_GROUP_RAID10: stripe_len = chunk_len / (num_stripes / btrfs_chunk_sub_stripes(leaf, chunk)); break; default: /* Invalid chunk profile found */ BUG_ON(1); } return stripe_len; } /* * Return <0 for error. * Return >0 if we can not find any dev extent beyond @physical * REturn 0 if we can find any dev extent beyond @physical or covers @physical. */ static int check_dev_extent_beyond_bytenr(struct btrfs_fs_info *fs_info, struct btrfs_device *device, u64 physical) { struct btrfs_root *root = fs_info->dev_root; struct btrfs_path path = { 0 }; struct btrfs_dev_extent *dext; struct btrfs_key key; u64 dext_len; u64 last_dev_extent_end = 0; int ret; key.objectid = device->devid; key.type = BTRFS_DEV_EXTENT_KEY; key.offset = (u64)-1; ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); if (ret < 0) return ret; if (ret == 0) { ret = -EUCLEAN; error("invalid dev extent found for devid %llu", device->devid); goto out; } ret = btrfs_previous_item(root, &path, device->devid, BTRFS_DEV_EXTENT_KEY); /* * Either <0 we error out, or ret > 0 we can not find any dev extent * for this device, then last_dev_extent_end will be 0 and we will * return 1. */ if (ret) goto out; btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); dext = btrfs_item_ptr(path.nodes[0], path.slots[0], struct btrfs_dev_extent); dext_len = btrfs_dev_extent_length(path.nodes[0], dext); last_dev_extent_end = dext_len + key.offset; out: btrfs_release_path(&path); if (ret < 0) return ret; if (last_dev_extent_end <= physical) return 1; return 0; } static int reset_device_item_total_bytes(struct btrfs_fs_info *fs_info, struct btrfs_device *device, u64 new_size) { struct btrfs_trans_handle *trans; struct btrfs_key key; struct btrfs_path path = { 0 }; struct btrfs_root *chunk_root = fs_info->chunk_root; struct btrfs_dev_item *di; u64 old_bytes = device->total_bytes; int ret; ASSERT(IS_ALIGNED(new_size, fs_info->sectorsize)); /* Align the in-memory total_bytes first, and use it as correct size */ device->total_bytes = new_size; key.objectid = BTRFS_DEV_ITEMS_OBJECTID; key.type = BTRFS_DEV_ITEM_KEY; key.offset = device->devid; trans = btrfs_start_transaction(chunk_root, 1); if (IS_ERR(trans)) { ret = PTR_ERR(trans); errno = -ret; error_msg(ERROR_MSG_START_TRANS, "%m"); return ret; } ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1); if (ret > 0) { error("failed to find DEV_ITEM for devid %llu", device->devid); ret = -ENOENT; goto err; } if (ret < 0) { errno = -ret; error("failed to search chunk root: %d (%m)", ret); goto err; } di = btrfs_item_ptr(path.nodes[0], path.slots[0], struct btrfs_dev_item); btrfs_set_device_total_bytes(path.nodes[0], di, device->total_bytes); btrfs_mark_buffer_dirty(path.nodes[0]); ret = btrfs_commit_transaction(trans, chunk_root); if (ret < 0) { errno = -ret; error_msg(ERROR_MSG_COMMIT_TRANS, "%m"); btrfs_release_path(&path); return ret; } btrfs_release_path(&path); printf("Fixed device size for devid %llu, old size: %llu new size: %llu\n", device->devid, old_bytes, device->total_bytes); return 1; err: /* We haven't modified anything, it's OK to commit current trans */ btrfs_commit_transaction(trans, chunk_root); btrfs_release_path(&path); return ret; } static int btrfs_fix_block_device_size(struct btrfs_fs_info *fs_info, struct btrfs_device *device) { struct stat st; u64 block_dev_size; int ret; if (device->fd < 0 || !device->writeable) { error("devid %llu is missing or not writable", device->devid); return -EINVAL; } ret = fstat(device->fd, &st); if (ret < 0) { error("failed to get block device size for devid %llu: %m", device->devid); return -errno; } block_dev_size = round_down(device_get_partition_size_fd_stat(device->fd, &st), fs_info->sectorsize); /* * Total_bytes in device item is no larger than the device block size, * already the correct case. */ if (device->total_bytes <= block_dev_size) return 0; /* * Now we need to check if there is any device extent beyond * @block_dev_size. */ ret = check_dev_extent_beyond_bytenr(fs_info, device, block_dev_size); if (ret < 0) return ret; if (ret == 0) { error( "found dev extents covering or beyond bytenr %llu, can not shrink the device without losing data", device->devid); return -EINVAL; } /* Now we can shrink the device item total_bytes to @block_dev_size. */ return reset_device_item_total_bytes(fs_info, device, block_dev_size); } /* * Return 0 if size of @device is already good * Return >0 if size of @device is not aligned but fixed without problems * Return <0 if something wrong happened when aligning the size of @device */ int btrfs_fix_device_size(struct btrfs_fs_info *fs_info, struct btrfs_device *device) { u64 old_bytes = device->total_bytes; /* * Our value is already good, then check if it's device item mismatch against * block device size. */ if (IS_ALIGNED(old_bytes, fs_info->sectorsize)) return btrfs_fix_block_device_size(fs_info, device); return reset_device_item_total_bytes(fs_info, device, round_down(old_bytes, fs_info->sectorsize)); } /* * Return 0 if super block total_bytes matches all devices' total_bytes * Return >0 if super block total_bytes mismatch but fixed without problem * Return <0 if we failed to fix super block total_bytes */ int btrfs_fix_super_size(struct btrfs_fs_info *fs_info) { struct btrfs_device *device; struct list_head *dev_list = &fs_info->fs_devices->devices; u64 total_bytes = 0; u64 old_bytes = btrfs_super_total_bytes(fs_info->super_copy); int ret; list_for_each_entry(device, dev_list, dev_list) { /* * Caller should ensure this function is called after aligning * all devices' total_bytes. */ if (!IS_ALIGNED(device->total_bytes, fs_info->sectorsize)) { error("device %llu total_bytes %llu not aligned to %u", device->devid, device->total_bytes, fs_info->sectorsize); return -EUCLEAN; } total_bytes += device->total_bytes; } if (total_bytes == old_bytes) return 0; btrfs_set_super_total_bytes(fs_info->super_copy, total_bytes); /* Do not use transaction for overwriting only the super block */ ret = write_all_supers(fs_info); if (ret < 0) { errno = -ret; error("failed to write super blocks: %d (%m)", ret); return ret; } printf("Fixed super total bytes, old size: %llu new size: %llu\n", old_bytes, total_bytes); return 1; } /* * Return 0 if all devices and super block sizes are good * Return >0 if any device/super size problem was found, but fixed * Return <0 if something wrong happened during fixing */ int btrfs_fix_device_and_super_size(struct btrfs_fs_info *fs_info) { struct btrfs_device *device; struct list_head *dev_list = &fs_info->fs_devices->devices; bool have_bad_value = false; int ret; /* Seed device is not supported yet */ if (fs_info->fs_devices->seed) { error("fixing device size with seed device is not supported yet"); return -EOPNOTSUPP; } /* All devices must be set up before repairing */ if (list_empty(dev_list)) { error("no device found"); return -ENODEV; } list_for_each_entry(device, dev_list, dev_list) { if (device->fd == -1 || !device->writeable) { error("devid %llu is missing or not writeable", device->devid); error( "fixing device size needs all device(s) to be present and writeable"); return -ENODEV; } } /* Repair total_bytes of each device */ list_for_each_entry(device, dev_list, dev_list) { ret = btrfs_fix_device_size(fs_info, device); if (ret < 0) return ret; if (ret > 0) have_bad_value = true; } /* Repair super total_byte */ ret = btrfs_fix_super_size(fs_info); if (ret > 0) have_bad_value = true; if (have_bad_value) { printf( "Fixed unaligned/mismatched total_bytes for super block and device items\n"); ret = 1; } else { printf("No device size related problem found\n"); ret = 0; } return ret; }