v4.19.13 snapshot.
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
new file mode 100644
index 0000000..d4a7f7c
--- /dev/null
+++ b/fs/btrfs/disk-io.c
@@ -0,0 +1,4511 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ */
+
+#include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <linux/radix-tree.h>
+#include <linux/writeback.h>
+#include <linux/buffer_head.h>
+#include <linux/workqueue.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <linux/migrate.h>
+#include <linux/ratelimit.h>
+#include <linux/uuid.h>
+#include <linux/semaphore.h>
+#include <linux/error-injection.h>
+#include <linux/crc32c.h>
+#include <asm/unaligned.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "transaction.h"
+#include "btrfs_inode.h"
+#include "volumes.h"
+#include "print-tree.h"
+#include "locking.h"
+#include "tree-log.h"
+#include "free-space-cache.h"
+#include "free-space-tree.h"
+#include "inode-map.h"
+#include "check-integrity.h"
+#include "rcu-string.h"
+#include "dev-replace.h"
+#include "raid56.h"
+#include "sysfs.h"
+#include "qgroup.h"
+#include "compression.h"
+#include "tree-checker.h"
+#include "ref-verify.h"
+
+#ifdef CONFIG_X86
+#include <asm/cpufeature.h>
+#endif
+
+#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
+ BTRFS_HEADER_FLAG_RELOC |\
+ BTRFS_SUPER_FLAG_ERROR |\
+ BTRFS_SUPER_FLAG_SEEDING |\
+ BTRFS_SUPER_FLAG_METADUMP |\
+ BTRFS_SUPER_FLAG_METADUMP_V2)
+
+static const struct extent_io_ops btree_extent_io_ops;
+static void end_workqueue_fn(struct btrfs_work *work);
+static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
+static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
+ struct btrfs_fs_info *fs_info);
+static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
+static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
+ struct extent_io_tree *dirty_pages,
+ int mark);
+static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
+ struct extent_io_tree *pinned_extents);
+static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
+static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
+
+/*
+ * btrfs_end_io_wq structs are used to do processing in task context when an IO
+ * is complete. This is used during reads to verify checksums, and it is used
+ * by writes to insert metadata for new file extents after IO is complete.
+ */
+struct btrfs_end_io_wq {
+ struct bio *bio;
+ bio_end_io_t *end_io;
+ void *private;
+ struct btrfs_fs_info *info;
+ blk_status_t status;
+ enum btrfs_wq_endio_type metadata;
+ struct btrfs_work work;
+};
+
+static struct kmem_cache *btrfs_end_io_wq_cache;
+
+int __init btrfs_end_io_wq_init(void)
+{
+ btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
+ sizeof(struct btrfs_end_io_wq),
+ 0,
+ SLAB_MEM_SPREAD,
+ NULL);
+ if (!btrfs_end_io_wq_cache)
+ return -ENOMEM;
+ return 0;
+}
+
+void __cold btrfs_end_io_wq_exit(void)
+{
+ kmem_cache_destroy(btrfs_end_io_wq_cache);
+}
+
+/*
+ * async submit bios are used to offload expensive checksumming
+ * onto the worker threads. They checksum file and metadata bios
+ * just before they are sent down the IO stack.
+ */
+struct async_submit_bio {
+ void *private_data;
+ struct bio *bio;
+ extent_submit_bio_start_t *submit_bio_start;
+ int mirror_num;
+ /*
+ * bio_offset is optional, can be used if the pages in the bio
+ * can't tell us where in the file the bio should go
+ */
+ u64 bio_offset;
+ struct btrfs_work work;
+ blk_status_t status;
+};
+
+/*
+ * Lockdep class keys for extent_buffer->lock's in this root. For a given
+ * eb, the lockdep key is determined by the btrfs_root it belongs to and
+ * the level the eb occupies in the tree.
+ *
+ * Different roots are used for different purposes and may nest inside each
+ * other and they require separate keysets. As lockdep keys should be
+ * static, assign keysets according to the purpose of the root as indicated
+ * by btrfs_root->objectid. This ensures that all special purpose roots
+ * have separate keysets.
+ *
+ * Lock-nesting across peer nodes is always done with the immediate parent
+ * node locked thus preventing deadlock. As lockdep doesn't know this, use
+ * subclass to avoid triggering lockdep warning in such cases.
+ *
+ * The key is set by the readpage_end_io_hook after the buffer has passed
+ * csum validation but before the pages are unlocked. It is also set by
+ * btrfs_init_new_buffer on freshly allocated blocks.
+ *
+ * We also add a check to make sure the highest level of the tree is the
+ * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
+ * needs update as well.
+ */
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# if BTRFS_MAX_LEVEL != 8
+# error
+# endif
+
+static struct btrfs_lockdep_keyset {
+ u64 id; /* root objectid */
+ const char *name_stem; /* lock name stem */
+ char names[BTRFS_MAX_LEVEL + 1][20];
+ struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
+} btrfs_lockdep_keysets[] = {
+ { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
+ { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
+ { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
+ { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
+ { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
+ { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
+ { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
+ { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
+ { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
+ { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
+ { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
+ { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, .name_stem = "free-space" },
+ { .id = 0, .name_stem = "tree" },
+};
+
+void __init btrfs_init_lockdep(void)
+{
+ int i, j;
+
+ /* initialize lockdep class names */
+ for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
+ struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
+
+ for (j = 0; j < ARRAY_SIZE(ks->names); j++)
+ snprintf(ks->names[j], sizeof(ks->names[j]),
+ "btrfs-%s-%02d", ks->name_stem, j);
+ }
+}
+
+void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
+ int level)
+{
+ struct btrfs_lockdep_keyset *ks;
+
+ BUG_ON(level >= ARRAY_SIZE(ks->keys));
+
+ /* find the matching keyset, id 0 is the default entry */
+ for (ks = btrfs_lockdep_keysets; ks->id; ks++)
+ if (ks->id == objectid)
+ break;
+
+ lockdep_set_class_and_name(&eb->lock,
+ &ks->keys[level], ks->names[level]);
+}
+
+#endif
+
+/*
+ * extents on the btree inode are pretty simple, there's one extent
+ * that covers the entire device
+ */
+struct extent_map *btree_get_extent(struct btrfs_inode *inode,
+ struct page *page, size_t pg_offset, u64 start, u64 len,
+ int create)
+{
+ struct btrfs_fs_info *fs_info = inode->root->fs_info;
+ struct extent_map_tree *em_tree = &inode->extent_tree;
+ struct extent_map *em;
+ int ret;
+
+ read_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, start, len);
+ if (em) {
+ em->bdev = fs_info->fs_devices->latest_bdev;
+ read_unlock(&em_tree->lock);
+ goto out;
+ }
+ read_unlock(&em_tree->lock);
+
+ em = alloc_extent_map();
+ if (!em) {
+ em = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ em->start = 0;
+ em->len = (u64)-1;
+ em->block_len = (u64)-1;
+ em->block_start = 0;
+ em->bdev = fs_info->fs_devices->latest_bdev;
+
+ write_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em, 0);
+ if (ret == -EEXIST) {
+ free_extent_map(em);
+ em = lookup_extent_mapping(em_tree, start, len);
+ if (!em)
+ em = ERR_PTR(-EIO);
+ } else if (ret) {
+ free_extent_map(em);
+ em = ERR_PTR(ret);
+ }
+ write_unlock(&em_tree->lock);
+
+out:
+ return em;
+}
+
+u32 btrfs_csum_data(const char *data, u32 seed, size_t len)
+{
+ return crc32c(seed, data, len);
+}
+
+void btrfs_csum_final(u32 crc, u8 *result)
+{
+ put_unaligned_le32(~crc, result);
+}
+
+/*
+ * compute the csum for a btree block, and either verify it or write it
+ * into the csum field of the block.
+ */
+static int csum_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf,
+ int verify)
+{
+ u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
+ char result[BTRFS_CSUM_SIZE];
+ unsigned long len;
+ unsigned long cur_len;
+ unsigned long offset = BTRFS_CSUM_SIZE;
+ char *kaddr;
+ unsigned long map_start;
+ unsigned long map_len;
+ int err;
+ u32 crc = ~(u32)0;
+
+ len = buf->len - offset;
+ while (len > 0) {
+ err = map_private_extent_buffer(buf, offset, 32,
+ &kaddr, &map_start, &map_len);
+ if (err)
+ return err;
+ cur_len = min(len, map_len - (offset - map_start));
+ crc = btrfs_csum_data(kaddr + offset - map_start,
+ crc, cur_len);
+ len -= cur_len;
+ offset += cur_len;
+ }
+ memset(result, 0, BTRFS_CSUM_SIZE);
+
+ btrfs_csum_final(crc, result);
+
+ if (verify) {
+ if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
+ u32 val;
+ u32 found = 0;
+ memcpy(&found, result, csum_size);
+
+ read_extent_buffer(buf, &val, 0, csum_size);
+ btrfs_warn_rl(fs_info,
+ "%s checksum verify failed on %llu wanted %X found %X level %d",
+ fs_info->sb->s_id, buf->start,
+ val, found, btrfs_header_level(buf));
+ return -EUCLEAN;
+ }
+ } else {
+ write_extent_buffer(buf, result, 0, csum_size);
+ }
+
+ return 0;
+}
+
+/*
+ * we can't consider a given block up to date unless the transid of the
+ * block matches the transid in the parent node's pointer. This is how we
+ * detect blocks that either didn't get written at all or got written
+ * in the wrong place.
+ */
+static int verify_parent_transid(struct extent_io_tree *io_tree,
+ struct extent_buffer *eb, u64 parent_transid,
+ int atomic)
+{
+ struct extent_state *cached_state = NULL;
+ int ret;
+ bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
+
+ if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
+ return 0;
+
+ if (atomic)
+ return -EAGAIN;
+
+ if (need_lock) {
+ btrfs_tree_read_lock(eb);
+ btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
+ }
+
+ lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
+ &cached_state);
+ if (extent_buffer_uptodate(eb) &&
+ btrfs_header_generation(eb) == parent_transid) {
+ ret = 0;
+ goto out;
+ }
+ btrfs_err_rl(eb->fs_info,
+ "parent transid verify failed on %llu wanted %llu found %llu",
+ eb->start,
+ parent_transid, btrfs_header_generation(eb));
+ ret = 1;
+
+ /*
+ * Things reading via commit roots that don't have normal protection,
+ * like send, can have a really old block in cache that may point at a
+ * block that has been freed and re-allocated. So don't clear uptodate
+ * if we find an eb that is under IO (dirty/writeback) because we could
+ * end up reading in the stale data and then writing it back out and
+ * making everybody very sad.
+ */
+ if (!extent_buffer_under_io(eb))
+ clear_extent_buffer_uptodate(eb);
+out:
+ unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
+ &cached_state);
+ if (need_lock)
+ btrfs_tree_read_unlock_blocking(eb);
+ return ret;
+}
+
+/*
+ * Return 0 if the superblock checksum type matches the checksum value of that
+ * algorithm. Pass the raw disk superblock data.
+ */
+static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
+ char *raw_disk_sb)
+{
+ struct btrfs_super_block *disk_sb =
+ (struct btrfs_super_block *)raw_disk_sb;
+ u16 csum_type = btrfs_super_csum_type(disk_sb);
+ int ret = 0;
+
+ if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
+ u32 crc = ~(u32)0;
+ char result[sizeof(crc)];
+
+ /*
+ * The super_block structure does not span the whole
+ * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
+ * is filled with zeros and is included in the checksum.
+ */
+ crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
+ crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, result);
+
+ if (memcmp(raw_disk_sb, result, sizeof(result)))
+ ret = 1;
+ }
+
+ if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
+ btrfs_err(fs_info, "unsupported checksum algorithm %u",
+ csum_type);
+ ret = 1;
+ }
+
+ return ret;
+}
+
+static int verify_level_key(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int level,
+ struct btrfs_key *first_key, u64 parent_transid)
+{
+ int found_level;
+ struct btrfs_key found_key;
+ int ret;
+
+ found_level = btrfs_header_level(eb);
+ if (found_level != level) {
+#ifdef CONFIG_BTRFS_DEBUG
+ WARN_ON(1);
+ btrfs_err(fs_info,
+"tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
+ eb->start, level, found_level);
+#endif
+ return -EIO;
+ }
+
+ if (!first_key)
+ return 0;
+
+ /*
+ * For live tree block (new tree blocks in current transaction),
+ * we need proper lock context to avoid race, which is impossible here.
+ * So we only checks tree blocks which is read from disk, whose
+ * generation <= fs_info->last_trans_committed.
+ */
+ if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
+ return 0;
+ if (found_level)
+ btrfs_node_key_to_cpu(eb, &found_key, 0);
+ else
+ btrfs_item_key_to_cpu(eb, &found_key, 0);
+ ret = btrfs_comp_cpu_keys(first_key, &found_key);
+
+#ifdef CONFIG_BTRFS_DEBUG
+ if (ret) {
+ WARN_ON(1);
+ btrfs_err(fs_info,
+"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
+ eb->start, parent_transid, first_key->objectid,
+ first_key->type, first_key->offset,
+ found_key.objectid, found_key.type,
+ found_key.offset);
+ }
+#endif
+ return ret;
+}
+
+/*
+ * helper to read a given tree block, doing retries as required when
+ * the checksums don't match and we have alternate mirrors to try.
+ *
+ * @parent_transid: expected transid, skip check if 0
+ * @level: expected level, mandatory check
+ * @first_key: expected key of first slot, skip check if NULL
+ */
+static int btree_read_extent_buffer_pages(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb,
+ u64 parent_transid, int level,
+ struct btrfs_key *first_key)
+{
+ struct extent_io_tree *io_tree;
+ int failed = 0;
+ int ret;
+ int num_copies = 0;
+ int mirror_num = 0;
+ int failed_mirror = 0;
+
+ io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
+ while (1) {
+ clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
+ ret = read_extent_buffer_pages(io_tree, eb, WAIT_COMPLETE,
+ mirror_num);
+ if (!ret) {
+ if (verify_parent_transid(io_tree, eb,
+ parent_transid, 0))
+ ret = -EIO;
+ else if (verify_level_key(fs_info, eb, level,
+ first_key, parent_transid))
+ ret = -EUCLEAN;
+ else
+ break;
+ }
+
+ num_copies = btrfs_num_copies(fs_info,
+ eb->start, eb->len);
+ if (num_copies == 1)
+ break;
+
+ if (!failed_mirror) {
+ failed = 1;
+ failed_mirror = eb->read_mirror;
+ }
+
+ mirror_num++;
+ if (mirror_num == failed_mirror)
+ mirror_num++;
+
+ if (mirror_num > num_copies)
+ break;
+ }
+
+ if (failed && !ret && failed_mirror)
+ repair_eb_io_failure(fs_info, eb, failed_mirror);
+
+ return ret;
+}
+
+/*
+ * checksum a dirty tree block before IO. This has extra checks to make sure
+ * we only fill in the checksum field in the first page of a multi-page block
+ */
+
+static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
+{
+ u64 start = page_offset(page);
+ u64 found_start;
+ struct extent_buffer *eb;
+
+ eb = (struct extent_buffer *)page->private;
+ if (page != eb->pages[0])
+ return 0;
+
+ found_start = btrfs_header_bytenr(eb);
+ /*
+ * Please do not consolidate these warnings into a single if.
+ * It is useful to know what went wrong.
+ */
+ if (WARN_ON(found_start != start))
+ return -EUCLEAN;
+ if (WARN_ON(!PageUptodate(page)))
+ return -EUCLEAN;
+
+ ASSERT(memcmp_extent_buffer(eb, fs_info->fsid,
+ btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
+
+ return csum_tree_block(fs_info, eb, 0);
+}
+
+static int check_tree_block_fsid(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb)
+{
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ u8 fsid[BTRFS_FSID_SIZE];
+ int ret = 1;
+
+ read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
+ while (fs_devices) {
+ if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
+ ret = 0;
+ break;
+ }
+ fs_devices = fs_devices->seed;
+ }
+ return ret;
+}
+
+static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
+ u64 phy_offset, struct page *page,
+ u64 start, u64 end, int mirror)
+{
+ u64 found_start;
+ int found_level;
+ struct extent_buffer *eb;
+ struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ int ret = 0;
+ int reads_done;
+
+ if (!page->private)
+ goto out;
+
+ eb = (struct extent_buffer *)page->private;
+
+ /* the pending IO might have been the only thing that kept this buffer
+ * in memory. Make sure we have a ref for all this other checks
+ */
+ extent_buffer_get(eb);
+
+ reads_done = atomic_dec_and_test(&eb->io_pages);
+ if (!reads_done)
+ goto err;
+
+ eb->read_mirror = mirror;
+ if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
+ ret = -EIO;
+ goto err;
+ }
+
+ found_start = btrfs_header_bytenr(eb);
+ if (found_start != eb->start) {
+ btrfs_err_rl(fs_info, "bad tree block start, want %llu have %llu",
+ eb->start, found_start);
+ ret = -EIO;
+ goto err;
+ }
+ if (check_tree_block_fsid(fs_info, eb)) {
+ btrfs_err_rl(fs_info, "bad fsid on block %llu",
+ eb->start);
+ ret = -EIO;
+ goto err;
+ }
+ found_level = btrfs_header_level(eb);
+ if (found_level >= BTRFS_MAX_LEVEL) {
+ btrfs_err(fs_info, "bad tree block level %d on %llu",
+ (int)btrfs_header_level(eb), eb->start);
+ ret = -EIO;
+ goto err;
+ }
+
+ btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
+ eb, found_level);
+
+ ret = csum_tree_block(fs_info, eb, 1);
+ if (ret)
+ goto err;
+
+ /*
+ * If this is a leaf block and it is corrupt, set the corrupt bit so
+ * that we don't try and read the other copies of this block, just
+ * return -EIO.
+ */
+ if (found_level == 0 && btrfs_check_leaf_full(fs_info, eb)) {
+ set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
+ ret = -EIO;
+ }
+
+ if (found_level > 0 && btrfs_check_node(fs_info, eb))
+ ret = -EIO;
+
+ if (!ret)
+ set_extent_buffer_uptodate(eb);
+err:
+ if (reads_done &&
+ test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
+ btree_readahead_hook(eb, ret);
+
+ if (ret) {
+ /*
+ * our io error hook is going to dec the io pages
+ * again, we have to make sure it has something
+ * to decrement
+ */
+ atomic_inc(&eb->io_pages);
+ clear_extent_buffer_uptodate(eb);
+ }
+ free_extent_buffer(eb);
+out:
+ return ret;
+}
+
+static int btree_io_failed_hook(struct page *page, int failed_mirror)
+{
+ struct extent_buffer *eb;
+
+ eb = (struct extent_buffer *)page->private;
+ set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
+ eb->read_mirror = failed_mirror;
+ atomic_dec(&eb->io_pages);
+ if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
+ btree_readahead_hook(eb, -EIO);
+ return -EIO; /* we fixed nothing */
+}
+
+static void end_workqueue_bio(struct bio *bio)
+{
+ struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_workqueue *wq;
+ btrfs_work_func_t func;
+
+ fs_info = end_io_wq->info;
+ end_io_wq->status = bio->bi_status;
+
+ if (bio_op(bio) == REQ_OP_WRITE) {
+ if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
+ wq = fs_info->endio_meta_write_workers;
+ func = btrfs_endio_meta_write_helper;
+ } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
+ wq = fs_info->endio_freespace_worker;
+ func = btrfs_freespace_write_helper;
+ } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
+ wq = fs_info->endio_raid56_workers;
+ func = btrfs_endio_raid56_helper;
+ } else {
+ wq = fs_info->endio_write_workers;
+ func = btrfs_endio_write_helper;
+ }
+ } else {
+ if (unlikely(end_io_wq->metadata ==
+ BTRFS_WQ_ENDIO_DIO_REPAIR)) {
+ wq = fs_info->endio_repair_workers;
+ func = btrfs_endio_repair_helper;
+ } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
+ wq = fs_info->endio_raid56_workers;
+ func = btrfs_endio_raid56_helper;
+ } else if (end_io_wq->metadata) {
+ wq = fs_info->endio_meta_workers;
+ func = btrfs_endio_meta_helper;
+ } else {
+ wq = fs_info->endio_workers;
+ func = btrfs_endio_helper;
+ }
+ }
+
+ btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
+ btrfs_queue_work(wq, &end_io_wq->work);
+}
+
+blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
+ enum btrfs_wq_endio_type metadata)
+{
+ struct btrfs_end_io_wq *end_io_wq;
+
+ end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
+ if (!end_io_wq)
+ return BLK_STS_RESOURCE;
+
+ end_io_wq->private = bio->bi_private;
+ end_io_wq->end_io = bio->bi_end_io;
+ end_io_wq->info = info;
+ end_io_wq->status = 0;
+ end_io_wq->bio = bio;
+ end_io_wq->metadata = metadata;
+
+ bio->bi_private = end_io_wq;
+ bio->bi_end_io = end_workqueue_bio;
+ return 0;
+}
+
+static void run_one_async_start(struct btrfs_work *work)
+{
+ struct async_submit_bio *async;
+ blk_status_t ret;
+
+ async = container_of(work, struct async_submit_bio, work);
+ ret = async->submit_bio_start(async->private_data, async->bio,
+ async->bio_offset);
+ if (ret)
+ async->status = ret;
+}
+
+static void run_one_async_done(struct btrfs_work *work)
+{
+ struct async_submit_bio *async;
+
+ async = container_of(work, struct async_submit_bio, work);
+
+ /* If an error occurred we just want to clean up the bio and move on */
+ if (async->status) {
+ async->bio->bi_status = async->status;
+ bio_endio(async->bio);
+ return;
+ }
+
+ btrfs_submit_bio_done(async->private_data, async->bio, async->mirror_num);
+}
+
+static void run_one_async_free(struct btrfs_work *work)
+{
+ struct async_submit_bio *async;
+
+ async = container_of(work, struct async_submit_bio, work);
+ kfree(async);
+}
+
+blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset, void *private_data,
+ extent_submit_bio_start_t *submit_bio_start)
+{
+ struct async_submit_bio *async;
+
+ async = kmalloc(sizeof(*async), GFP_NOFS);
+ if (!async)
+ return BLK_STS_RESOURCE;
+
+ async->private_data = private_data;
+ async->bio = bio;
+ async->mirror_num = mirror_num;
+ async->submit_bio_start = submit_bio_start;
+
+ btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
+ run_one_async_done, run_one_async_free);
+
+ async->bio_offset = bio_offset;
+
+ async->status = 0;
+
+ if (op_is_sync(bio->bi_opf))
+ btrfs_set_work_high_priority(&async->work);
+
+ btrfs_queue_work(fs_info->workers, &async->work);
+ return 0;
+}
+
+static blk_status_t btree_csum_one_bio(struct bio *bio)
+{
+ struct bio_vec *bvec;
+ struct btrfs_root *root;
+ int i, ret = 0;
+
+ ASSERT(!bio_flagged(bio, BIO_CLONED));
+ bio_for_each_segment_all(bvec, bio, i) {
+ root = BTRFS_I(bvec->bv_page->mapping->host)->root;
+ ret = csum_dirty_buffer(root->fs_info, bvec->bv_page);
+ if (ret)
+ break;
+ }
+
+ return errno_to_blk_status(ret);
+}
+
+static blk_status_t btree_submit_bio_start(void *private_data, struct bio *bio,
+ u64 bio_offset)
+{
+ /*
+ * when we're called for a write, we're already in the async
+ * submission context. Just jump into btrfs_map_bio
+ */
+ return btree_csum_one_bio(bio);
+}
+
+static int check_async_write(struct btrfs_inode *bi)
+{
+ if (atomic_read(&bi->sync_writers))
+ return 0;
+#ifdef CONFIG_X86
+ if (static_cpu_has(X86_FEATURE_XMM4_2))
+ return 0;
+#endif
+ return 1;
+}
+
+static blk_status_t btree_submit_bio_hook(void *private_data, struct bio *bio,
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset)
+{
+ struct inode *inode = private_data;
+ struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+ int async = check_async_write(BTRFS_I(inode));
+ blk_status_t ret;
+
+ if (bio_op(bio) != REQ_OP_WRITE) {
+ /*
+ * called for a read, do the setup so that checksum validation
+ * can happen in the async kernel threads
+ */
+ ret = btrfs_bio_wq_end_io(fs_info, bio,
+ BTRFS_WQ_ENDIO_METADATA);
+ if (ret)
+ goto out_w_error;
+ ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
+ } else if (!async) {
+ ret = btree_csum_one_bio(bio);
+ if (ret)
+ goto out_w_error;
+ ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
+ } else {
+ /*
+ * kthread helpers are used to submit writes so that
+ * checksumming can happen in parallel across all CPUs
+ */
+ ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, 0,
+ bio_offset, private_data,
+ btree_submit_bio_start);
+ }
+
+ if (ret)
+ goto out_w_error;
+ return 0;
+
+out_w_error:
+ bio->bi_status = ret;
+ bio_endio(bio);
+ return ret;
+}
+
+#ifdef CONFIG_MIGRATION
+static int btree_migratepage(struct address_space *mapping,
+ struct page *newpage, struct page *page,
+ enum migrate_mode mode)
+{
+ /*
+ * we can't safely write a btree page from here,
+ * we haven't done the locking hook
+ */
+ if (PageDirty(page))
+ return -EAGAIN;
+ /*
+ * Buffers may be managed in a filesystem specific way.
+ * We must have no buffers or drop them.
+ */
+ if (page_has_private(page) &&
+ !try_to_release_page(page, GFP_KERNEL))
+ return -EAGAIN;
+ return migrate_page(mapping, newpage, page, mode);
+}
+#endif
+
+
+static int btree_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct btrfs_fs_info *fs_info;
+ int ret;
+
+ if (wbc->sync_mode == WB_SYNC_NONE) {
+
+ if (wbc->for_kupdate)
+ return 0;
+
+ fs_info = BTRFS_I(mapping->host)->root->fs_info;
+ /* this is a bit racy, but that's ok */
+ ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
+ BTRFS_DIRTY_METADATA_THRESH,
+ fs_info->dirty_metadata_batch);
+ if (ret < 0)
+ return 0;
+ }
+ return btree_write_cache_pages(mapping, wbc);
+}
+
+static int btree_readpage(struct file *file, struct page *page)
+{
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
+ return extent_read_full_page(tree, page, btree_get_extent, 0);
+}
+
+static int btree_releasepage(struct page *page, gfp_t gfp_flags)
+{
+ if (PageWriteback(page) || PageDirty(page))
+ return 0;
+
+ return try_release_extent_buffer(page);
+}
+
+static void btree_invalidatepage(struct page *page, unsigned int offset,
+ unsigned int length)
+{
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
+ extent_invalidatepage(tree, page, offset);
+ btree_releasepage(page, GFP_NOFS);
+ if (PagePrivate(page)) {
+ btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
+ "page private not zero on page %llu",
+ (unsigned long long)page_offset(page));
+ ClearPagePrivate(page);
+ set_page_private(page, 0);
+ put_page(page);
+ }
+}
+
+static int btree_set_page_dirty(struct page *page)
+{
+#ifdef DEBUG
+ struct extent_buffer *eb;
+
+ BUG_ON(!PagePrivate(page));
+ eb = (struct extent_buffer *)page->private;
+ BUG_ON(!eb);
+ BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
+ BUG_ON(!atomic_read(&eb->refs));
+ btrfs_assert_tree_locked(eb);
+#endif
+ return __set_page_dirty_nobuffers(page);
+}
+
+static const struct address_space_operations btree_aops = {
+ .readpage = btree_readpage,
+ .writepages = btree_writepages,
+ .releasepage = btree_releasepage,
+ .invalidatepage = btree_invalidatepage,
+#ifdef CONFIG_MIGRATION
+ .migratepage = btree_migratepage,
+#endif
+ .set_page_dirty = btree_set_page_dirty,
+};
+
+void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr)
+{
+ struct extent_buffer *buf = NULL;
+ struct inode *btree_inode = fs_info->btree_inode;
+
+ buf = btrfs_find_create_tree_block(fs_info, bytenr);
+ if (IS_ERR(buf))
+ return;
+ read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
+ buf, WAIT_NONE, 0);
+ free_extent_buffer(buf);
+}
+
+int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
+ int mirror_num, struct extent_buffer **eb)
+{
+ struct extent_buffer *buf = NULL;
+ struct inode *btree_inode = fs_info->btree_inode;
+ struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree;
+ int ret;
+
+ buf = btrfs_find_create_tree_block(fs_info, bytenr);
+ if (IS_ERR(buf))
+ return 0;
+
+ set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
+
+ ret = read_extent_buffer_pages(io_tree, buf, WAIT_PAGE_LOCK,
+ mirror_num);
+ if (ret) {
+ free_extent_buffer(buf);
+ return ret;
+ }
+
+ if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
+ free_extent_buffer(buf);
+ return -EIO;
+ } else if (extent_buffer_uptodate(buf)) {
+ *eb = buf;
+ } else {
+ free_extent_buffer(buf);
+ }
+ return 0;
+}
+
+struct extent_buffer *btrfs_find_create_tree_block(
+ struct btrfs_fs_info *fs_info,
+ u64 bytenr)
+{
+ if (btrfs_is_testing(fs_info))
+ return alloc_test_extent_buffer(fs_info, bytenr);
+ return alloc_extent_buffer(fs_info, bytenr);
+}
+
+
+int btrfs_write_tree_block(struct extent_buffer *buf)
+{
+ return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start,
+ buf->start + buf->len - 1);
+}
+
+void btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
+{
+ filemap_fdatawait_range(buf->pages[0]->mapping,
+ buf->start, buf->start + buf->len - 1);
+}
+
+/*
+ * Read tree block at logical address @bytenr and do variant basic but critical
+ * verification.
+ *
+ * @parent_transid: expected transid of this tree block, skip check if 0
+ * @level: expected level, mandatory check
+ * @first_key: expected key in slot 0, skip check if NULL
+ */
+struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 parent_transid, int level,
+ struct btrfs_key *first_key)
+{
+ struct extent_buffer *buf = NULL;
+ int ret;
+
+ buf = btrfs_find_create_tree_block(fs_info, bytenr);
+ if (IS_ERR(buf))
+ return buf;
+
+ ret = btree_read_extent_buffer_pages(fs_info, buf, parent_transid,
+ level, first_key);
+ if (ret) {
+ free_extent_buffer(buf);
+ return ERR_PTR(ret);
+ }
+ return buf;
+
+}
+
+void clean_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf)
+{
+ if (btrfs_header_generation(buf) ==
+ fs_info->running_transaction->transid) {
+ btrfs_assert_tree_locked(buf);
+
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
+ percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
+ -buf->len,
+ fs_info->dirty_metadata_batch);
+ /* ugh, clear_extent_buffer_dirty needs to lock the page */
+ btrfs_set_lock_blocking(buf);
+ clear_extent_buffer_dirty(buf);
+ }
+ }
+}
+
+static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
+{
+ struct btrfs_subvolume_writers *writers;
+ int ret;
+
+ writers = kmalloc(sizeof(*writers), GFP_NOFS);
+ if (!writers)
+ return ERR_PTR(-ENOMEM);
+
+ ret = percpu_counter_init(&writers->counter, 0, GFP_NOFS);
+ if (ret < 0) {
+ kfree(writers);
+ return ERR_PTR(ret);
+ }
+
+ init_waitqueue_head(&writers->wait);
+ return writers;
+}
+
+static void
+btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
+{
+ percpu_counter_destroy(&writers->counter);
+ kfree(writers);
+}
+
+static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
+ u64 objectid)
+{
+ bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
+ root->node = NULL;
+ root->commit_root = NULL;
+ root->state = 0;
+ root->orphan_cleanup_state = 0;
+
+ root->objectid = objectid;
+ root->last_trans = 0;
+ root->highest_objectid = 0;
+ root->nr_delalloc_inodes = 0;
+ root->nr_ordered_extents = 0;
+ root->inode_tree = RB_ROOT;
+ INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
+ root->block_rsv = NULL;
+
+ INIT_LIST_HEAD(&root->dirty_list);
+ INIT_LIST_HEAD(&root->root_list);
+ INIT_LIST_HEAD(&root->delalloc_inodes);
+ INIT_LIST_HEAD(&root->delalloc_root);
+ INIT_LIST_HEAD(&root->ordered_extents);
+ INIT_LIST_HEAD(&root->ordered_root);
+ INIT_LIST_HEAD(&root->logged_list[0]);
+ INIT_LIST_HEAD(&root->logged_list[1]);
+ spin_lock_init(&root->inode_lock);
+ spin_lock_init(&root->delalloc_lock);
+ spin_lock_init(&root->ordered_extent_lock);
+ spin_lock_init(&root->accounting_lock);
+ spin_lock_init(&root->log_extents_lock[0]);
+ spin_lock_init(&root->log_extents_lock[1]);
+ spin_lock_init(&root->qgroup_meta_rsv_lock);
+ mutex_init(&root->objectid_mutex);
+ mutex_init(&root->log_mutex);
+ mutex_init(&root->ordered_extent_mutex);
+ mutex_init(&root->delalloc_mutex);
+ init_waitqueue_head(&root->log_writer_wait);
+ init_waitqueue_head(&root->log_commit_wait[0]);
+ init_waitqueue_head(&root->log_commit_wait[1]);
+ INIT_LIST_HEAD(&root->log_ctxs[0]);
+ INIT_LIST_HEAD(&root->log_ctxs[1]);
+ atomic_set(&root->log_commit[0], 0);
+ atomic_set(&root->log_commit[1], 0);
+ atomic_set(&root->log_writers, 0);
+ atomic_set(&root->log_batch, 0);
+ refcount_set(&root->refs, 1);
+ atomic_set(&root->will_be_snapshotted, 0);
+ atomic_set(&root->snapshot_force_cow, 0);
+ root->log_transid = 0;
+ root->log_transid_committed = -1;
+ root->last_log_commit = 0;
+ if (!dummy)
+ extent_io_tree_init(&root->dirty_log_pages, NULL);
+
+ memset(&root->root_key, 0, sizeof(root->root_key));
+ memset(&root->root_item, 0, sizeof(root->root_item));
+ memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
+ if (!dummy)
+ root->defrag_trans_start = fs_info->generation;
+ else
+ root->defrag_trans_start = 0;
+ root->root_key.objectid = objectid;
+ root->anon_dev = 0;
+
+ spin_lock_init(&root->root_item_lock);
+}
+
+static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
+ gfp_t flags)
+{
+ struct btrfs_root *root = kzalloc(sizeof(*root), flags);
+ if (root)
+ root->fs_info = fs_info;
+ return root;
+}
+
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+/* Should only be used by the testing infrastructure */
+struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *root;
+
+ if (!fs_info)
+ return ERR_PTR(-EINVAL);
+
+ root = btrfs_alloc_root(fs_info, GFP_KERNEL);
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+
+ /* We don't use the stripesize in selftest, set it as sectorsize */
+ __setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
+ root->alloc_bytenr = 0;
+
+ return root;
+}
+#endif
+
+struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info,
+ u64 objectid)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_root *tree_root = fs_info->tree_root;
+ struct btrfs_root *root;
+ struct btrfs_key key;
+ int ret = 0;
+ uuid_le uuid = NULL_UUID_LE;
+
+ root = btrfs_alloc_root(fs_info, GFP_KERNEL);
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+
+ __setup_root(root, fs_info, objectid);
+ root->root_key.objectid = objectid;
+ root->root_key.type = BTRFS_ROOT_ITEM_KEY;
+ root->root_key.offset = 0;
+
+ leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
+ if (IS_ERR(leaf)) {
+ ret = PTR_ERR(leaf);
+ leaf = NULL;
+ goto fail;
+ }
+
+ root->node = leaf;
+ btrfs_mark_buffer_dirty(leaf);
+
+ root->commit_root = btrfs_root_node(root);
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+
+ root->root_item.flags = 0;
+ root->root_item.byte_limit = 0;
+ btrfs_set_root_bytenr(&root->root_item, leaf->start);
+ btrfs_set_root_generation(&root->root_item, trans->transid);
+ btrfs_set_root_level(&root->root_item, 0);
+ btrfs_set_root_refs(&root->root_item, 1);
+ btrfs_set_root_used(&root->root_item, leaf->len);
+ btrfs_set_root_last_snapshot(&root->root_item, 0);
+ btrfs_set_root_dirid(&root->root_item, 0);
+ if (is_fstree(objectid))
+ uuid_le_gen(&uuid);
+ memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
+ root->root_item.drop_level = 0;
+
+ key.objectid = objectid;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = 0;
+ ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
+ if (ret)
+ goto fail;
+
+ btrfs_tree_unlock(leaf);
+
+ return root;
+
+fail:
+ if (leaf) {
+ btrfs_tree_unlock(leaf);
+ free_extent_buffer(root->commit_root);
+ free_extent_buffer(leaf);
+ }
+ kfree(root);
+
+ return ERR_PTR(ret);
+}
+
+static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *root;
+ struct extent_buffer *leaf;
+
+ root = btrfs_alloc_root(fs_info, GFP_NOFS);
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+
+ __setup_root(root, fs_info, BTRFS_TREE_LOG_OBJECTID);
+
+ root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
+ root->root_key.type = BTRFS_ROOT_ITEM_KEY;
+ root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
+
+ /*
+ * DON'T set REF_COWS for log trees
+ *
+ * log trees do not get reference counted because they go away
+ * before a real commit is actually done. They do store pointers
+ * to file data extents, and those reference counts still get
+ * updated (along with back refs to the log tree).
+ */
+
+ leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
+ NULL, 0, 0, 0);
+ if (IS_ERR(leaf)) {
+ kfree(root);
+ return ERR_CAST(leaf);
+ }
+
+ root->node = leaf;
+
+ btrfs_mark_buffer_dirty(root->node);
+ btrfs_tree_unlock(root->node);
+ return root;
+}
+
+int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *log_root;
+
+ log_root = alloc_log_tree(trans, fs_info);
+ if (IS_ERR(log_root))
+ return PTR_ERR(log_root);
+ WARN_ON(fs_info->log_root_tree);
+ fs_info->log_root_tree = log_root;
+ return 0;
+}
+
+int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_root *log_root;
+ struct btrfs_inode_item *inode_item;
+
+ log_root = alloc_log_tree(trans, fs_info);
+ if (IS_ERR(log_root))
+ return PTR_ERR(log_root);
+
+ log_root->last_trans = trans->transid;
+ log_root->root_key.offset = root->root_key.objectid;
+
+ inode_item = &log_root->root_item.inode;
+ btrfs_set_stack_inode_generation(inode_item, 1);
+ btrfs_set_stack_inode_size(inode_item, 3);
+ btrfs_set_stack_inode_nlink(inode_item, 1);
+ btrfs_set_stack_inode_nbytes(inode_item,
+ fs_info->nodesize);
+ btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
+
+ btrfs_set_root_node(&log_root->root_item, log_root->node);
+
+ WARN_ON(root->log_root);
+ root->log_root = log_root;
+ root->log_transid = 0;
+ root->log_transid_committed = -1;
+ root->last_log_commit = 0;
+ return 0;
+}
+
+static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
+ struct btrfs_key *key)
+{
+ struct btrfs_root *root;
+ struct btrfs_fs_info *fs_info = tree_root->fs_info;
+ struct btrfs_path *path;
+ u64 generation;
+ int ret;
+ int level;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return ERR_PTR(-ENOMEM);
+
+ root = btrfs_alloc_root(fs_info, GFP_NOFS);
+ if (!root) {
+ ret = -ENOMEM;
+ goto alloc_fail;
+ }
+
+ __setup_root(root, fs_info, key->objectid);
+
+ ret = btrfs_find_root(tree_root, key, path,
+ &root->root_item, &root->root_key);
+ if (ret) {
+ if (ret > 0)
+ ret = -ENOENT;
+ goto find_fail;
+ }
+
+ generation = btrfs_root_generation(&root->root_item);
+ level = btrfs_root_level(&root->root_item);
+ root->node = read_tree_block(fs_info,
+ btrfs_root_bytenr(&root->root_item),
+ generation, level, NULL);
+ if (IS_ERR(root->node)) {
+ ret = PTR_ERR(root->node);
+ goto find_fail;
+ } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
+ ret = -EIO;
+ free_extent_buffer(root->node);
+ goto find_fail;
+ }
+ root->commit_root = btrfs_root_node(root);
+out:
+ btrfs_free_path(path);
+ return root;
+
+find_fail:
+ kfree(root);
+alloc_fail:
+ root = ERR_PTR(ret);
+ goto out;
+}
+
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
+ struct btrfs_key *location)
+{
+ struct btrfs_root *root;
+
+ root = btrfs_read_tree_root(tree_root, location);
+ if (IS_ERR(root))
+ return root;
+
+ if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
+ set_bit(BTRFS_ROOT_REF_COWS, &root->state);
+ btrfs_check_and_init_root_item(&root->root_item);
+ }
+
+ return root;
+}
+
+int btrfs_init_fs_root(struct btrfs_root *root)
+{
+ int ret;
+ struct btrfs_subvolume_writers *writers;
+
+ root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
+ root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
+ GFP_NOFS);
+ if (!root->free_ino_pinned || !root->free_ino_ctl) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ writers = btrfs_alloc_subvolume_writers();
+ if (IS_ERR(writers)) {
+ ret = PTR_ERR(writers);
+ goto fail;
+ }
+ root->subv_writers = writers;
+
+ btrfs_init_free_ino_ctl(root);
+ spin_lock_init(&root->ino_cache_lock);
+ init_waitqueue_head(&root->ino_cache_wait);
+
+ ret = get_anon_bdev(&root->anon_dev);
+ if (ret)
+ goto fail;
+
+ mutex_lock(&root->objectid_mutex);
+ ret = btrfs_find_highest_objectid(root,
+ &root->highest_objectid);
+ if (ret) {
+ mutex_unlock(&root->objectid_mutex);
+ goto fail;
+ }
+
+ ASSERT(root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
+
+ mutex_unlock(&root->objectid_mutex);
+
+ return 0;
+fail:
+ /* The caller is responsible to call btrfs_free_fs_root */
+ return ret;
+}
+
+struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
+ u64 root_id)
+{
+ struct btrfs_root *root;
+
+ spin_lock(&fs_info->fs_roots_radix_lock);
+ root = radix_tree_lookup(&fs_info->fs_roots_radix,
+ (unsigned long)root_id);
+ spin_unlock(&fs_info->fs_roots_radix_lock);
+ return root;
+}
+
+int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *root)
+{
+ int ret;
+
+ ret = radix_tree_preload(GFP_NOFS);
+ if (ret)
+ return ret;
+
+ spin_lock(&fs_info->fs_roots_radix_lock);
+ ret = radix_tree_insert(&fs_info->fs_roots_radix,
+ (unsigned long)root->root_key.objectid,
+ root);
+ if (ret == 0)
+ set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
+ spin_unlock(&fs_info->fs_roots_radix_lock);
+ radix_tree_preload_end();
+
+ return ret;
+}
+
+struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location,
+ bool check_ref)
+{
+ struct btrfs_root *root;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret;
+
+ if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return fs_info->tree_root;
+ if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
+ return fs_info->extent_root;
+ if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
+ return fs_info->chunk_root;
+ if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
+ return fs_info->dev_root;
+ if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
+ return fs_info->csum_root;
+ if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
+ return fs_info->quota_root ? fs_info->quota_root :
+ ERR_PTR(-ENOENT);
+ if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
+ return fs_info->uuid_root ? fs_info->uuid_root :
+ ERR_PTR(-ENOENT);
+ if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
+ return fs_info->free_space_root ? fs_info->free_space_root :
+ ERR_PTR(-ENOENT);
+again:
+ root = btrfs_lookup_fs_root(fs_info, location->objectid);
+ if (root) {
+ if (check_ref && btrfs_root_refs(&root->root_item) == 0)
+ return ERR_PTR(-ENOENT);
+ return root;
+ }
+
+ root = btrfs_read_fs_root(fs_info->tree_root, location);
+ if (IS_ERR(root))
+ return root;
+
+ if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
+ ret = -ENOENT;
+ goto fail;
+ }
+
+ ret = btrfs_init_fs_root(root);
+ if (ret)
+ goto fail;
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ key.type = BTRFS_ORPHAN_ITEM_KEY;
+ key.offset = location->objectid;
+
+ ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
+ btrfs_free_path(path);
+ if (ret < 0)
+ goto fail;
+ if (ret == 0)
+ set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
+
+ ret = btrfs_insert_fs_root(fs_info, root);
+ if (ret) {
+ if (ret == -EEXIST) {
+ btrfs_free_fs_root(root);
+ goto again;
+ }
+ goto fail;
+ }
+ return root;
+fail:
+ btrfs_free_fs_root(root);
+ return ERR_PTR(ret);
+}
+
+static int btrfs_congested_fn(void *congested_data, int bdi_bits)
+{
+ struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
+ int ret = 0;
+ struct btrfs_device *device;
+ struct backing_dev_info *bdi;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
+ if (!device->bdev)
+ continue;
+ bdi = device->bdev->bd_bdi;
+ if (bdi_congested(bdi, bdi_bits)) {
+ ret = 1;
+ break;
+ }
+ }
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * called by the kthread helper functions to finally call the bio end_io
+ * functions. This is where read checksum verification actually happens
+ */
+static void end_workqueue_fn(struct btrfs_work *work)
+{
+ struct bio *bio;
+ struct btrfs_end_io_wq *end_io_wq;
+
+ end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
+ bio = end_io_wq->bio;
+
+ bio->bi_status = end_io_wq->status;
+ bio->bi_private = end_io_wq->private;
+ bio->bi_end_io = end_io_wq->end_io;
+ kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
+ bio_endio(bio);
+}
+
+static int cleaner_kthread(void *arg)
+{
+ struct btrfs_root *root = arg;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ int again;
+
+ while (1) {
+ again = 0;
+
+ /* Make the cleaner go to sleep early. */
+ if (btrfs_need_cleaner_sleep(fs_info))
+ goto sleep;
+
+ /*
+ * Do not do anything if we might cause open_ctree() to block
+ * before we have finished mounting the filesystem.
+ */
+ if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
+ goto sleep;
+
+ if (!mutex_trylock(&fs_info->cleaner_mutex))
+ goto sleep;
+
+ /*
+ * Avoid the problem that we change the status of the fs
+ * during the above check and trylock.
+ */
+ if (btrfs_need_cleaner_sleep(fs_info)) {
+ mutex_unlock(&fs_info->cleaner_mutex);
+ goto sleep;
+ }
+
+ mutex_lock(&fs_info->cleaner_delayed_iput_mutex);
+ btrfs_run_delayed_iputs(fs_info);
+ mutex_unlock(&fs_info->cleaner_delayed_iput_mutex);
+
+ again = btrfs_clean_one_deleted_snapshot(root);
+ mutex_unlock(&fs_info->cleaner_mutex);
+
+ /*
+ * The defragger has dealt with the R/O remount and umount,
+ * needn't do anything special here.
+ */
+ btrfs_run_defrag_inodes(fs_info);
+
+ /*
+ * Acquires fs_info->delete_unused_bgs_mutex to avoid racing
+ * with relocation (btrfs_relocate_chunk) and relocation
+ * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
+ * after acquiring fs_info->delete_unused_bgs_mutex. So we
+ * can't hold, nor need to, fs_info->cleaner_mutex when deleting
+ * unused block groups.
+ */
+ btrfs_delete_unused_bgs(fs_info);
+sleep:
+ if (kthread_should_park())
+ kthread_parkme();
+ if (kthread_should_stop())
+ return 0;
+ if (!again) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ __set_current_state(TASK_RUNNING);
+ }
+ }
+}
+
+static int transaction_kthread(void *arg)
+{
+ struct btrfs_root *root = arg;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_transaction *cur;
+ u64 transid;
+ time64_t now;
+ unsigned long delay;
+ bool cannot_commit;
+
+ do {
+ cannot_commit = false;
+ delay = HZ * fs_info->commit_interval;
+ mutex_lock(&fs_info->transaction_kthread_mutex);
+
+ spin_lock(&fs_info->trans_lock);
+ cur = fs_info->running_transaction;
+ if (!cur) {
+ spin_unlock(&fs_info->trans_lock);
+ goto sleep;
+ }
+
+ now = ktime_get_seconds();
+ if (cur->state < TRANS_STATE_BLOCKED &&
+ !test_bit(BTRFS_FS_NEED_ASYNC_COMMIT, &fs_info->flags) &&
+ (now < cur->start_time ||
+ now - cur->start_time < fs_info->commit_interval)) {
+ spin_unlock(&fs_info->trans_lock);
+ delay = HZ * 5;
+ goto sleep;
+ }
+ transid = cur->transid;
+ spin_unlock(&fs_info->trans_lock);
+
+ /* If the file system is aborted, this will always fail. */
+ trans = btrfs_attach_transaction(root);
+ if (IS_ERR(trans)) {
+ if (PTR_ERR(trans) != -ENOENT)
+ cannot_commit = true;
+ goto sleep;
+ }
+ if (transid == trans->transid) {
+ btrfs_commit_transaction(trans);
+ } else {
+ btrfs_end_transaction(trans);
+ }
+sleep:
+ wake_up_process(fs_info->cleaner_kthread);
+ mutex_unlock(&fs_info->transaction_kthread_mutex);
+
+ if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
+ &fs_info->fs_state)))
+ btrfs_cleanup_transaction(fs_info);
+ if (!kthread_should_stop() &&
+ (!btrfs_transaction_blocked(fs_info) ||
+ cannot_commit))
+ schedule_timeout_interruptible(delay);
+ } while (!kthread_should_stop());
+ return 0;
+}
+
+/*
+ * this will find the highest generation in the array of
+ * root backups. The index of the highest array is returned,
+ * or -1 if we can't find anything.
+ *
+ * We check to make sure the array is valid by comparing the
+ * generation of the latest root in the array with the generation
+ * in the super block. If they don't match we pitch it.
+ */
+static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
+{
+ u64 cur;
+ int newest_index = -1;
+ struct btrfs_root_backup *root_backup;
+ int i;
+
+ for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
+ root_backup = info->super_copy->super_roots + i;
+ cur = btrfs_backup_tree_root_gen(root_backup);
+ if (cur == newest_gen)
+ newest_index = i;
+ }
+
+ /* check to see if we actually wrapped around */
+ if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
+ root_backup = info->super_copy->super_roots;
+ cur = btrfs_backup_tree_root_gen(root_backup);
+ if (cur == newest_gen)
+ newest_index = 0;
+ }
+ return newest_index;
+}
+
+
+/*
+ * find the oldest backup so we know where to store new entries
+ * in the backup array. This will set the backup_root_index
+ * field in the fs_info struct
+ */
+static void find_oldest_super_backup(struct btrfs_fs_info *info,
+ u64 newest_gen)
+{
+ int newest_index = -1;
+
+ newest_index = find_newest_super_backup(info, newest_gen);
+ /* if there was garbage in there, just move along */
+ if (newest_index == -1) {
+ info->backup_root_index = 0;
+ } else {
+ info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
+ }
+}
+
+/*
+ * copy all the root pointers into the super backup array.
+ * this will bump the backup pointer by one when it is
+ * done
+ */
+static void backup_super_roots(struct btrfs_fs_info *info)
+{
+ int next_backup;
+ struct btrfs_root_backup *root_backup;
+ int last_backup;
+
+ next_backup = info->backup_root_index;
+ last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
+ BTRFS_NUM_BACKUP_ROOTS;
+
+ /*
+ * just overwrite the last backup if we're at the same generation
+ * this happens only at umount
+ */
+ root_backup = info->super_for_commit->super_roots + last_backup;
+ if (btrfs_backup_tree_root_gen(root_backup) ==
+ btrfs_header_generation(info->tree_root->node))
+ next_backup = last_backup;
+
+ root_backup = info->super_for_commit->super_roots + next_backup;
+
+ /*
+ * make sure all of our padding and empty slots get zero filled
+ * regardless of which ones we use today
+ */
+ memset(root_backup, 0, sizeof(*root_backup));
+
+ info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
+
+ btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
+ btrfs_set_backup_tree_root_gen(root_backup,
+ btrfs_header_generation(info->tree_root->node));
+
+ btrfs_set_backup_tree_root_level(root_backup,
+ btrfs_header_level(info->tree_root->node));
+
+ btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
+ btrfs_set_backup_chunk_root_gen(root_backup,
+ btrfs_header_generation(info->chunk_root->node));
+ btrfs_set_backup_chunk_root_level(root_backup,
+ btrfs_header_level(info->chunk_root->node));
+
+ btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
+ btrfs_set_backup_extent_root_gen(root_backup,
+ btrfs_header_generation(info->extent_root->node));
+ btrfs_set_backup_extent_root_level(root_backup,
+ btrfs_header_level(info->extent_root->node));
+
+ /*
+ * we might commit during log recovery, which happens before we set
+ * the fs_root. Make sure it is valid before we fill it in.
+ */
+ if (info->fs_root && info->fs_root->node) {
+ btrfs_set_backup_fs_root(root_backup,
+ info->fs_root->node->start);
+ btrfs_set_backup_fs_root_gen(root_backup,
+ btrfs_header_generation(info->fs_root->node));
+ btrfs_set_backup_fs_root_level(root_backup,
+ btrfs_header_level(info->fs_root->node));
+ }
+
+ btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
+ btrfs_set_backup_dev_root_gen(root_backup,
+ btrfs_header_generation(info->dev_root->node));
+ btrfs_set_backup_dev_root_level(root_backup,
+ btrfs_header_level(info->dev_root->node));
+
+ btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
+ btrfs_set_backup_csum_root_gen(root_backup,
+ btrfs_header_generation(info->csum_root->node));
+ btrfs_set_backup_csum_root_level(root_backup,
+ btrfs_header_level(info->csum_root->node));
+
+ btrfs_set_backup_total_bytes(root_backup,
+ btrfs_super_total_bytes(info->super_copy));
+ btrfs_set_backup_bytes_used(root_backup,
+ btrfs_super_bytes_used(info->super_copy));
+ btrfs_set_backup_num_devices(root_backup,
+ btrfs_super_num_devices(info->super_copy));
+
+ /*
+ * if we don't copy this out to the super_copy, it won't get remembered
+ * for the next commit
+ */
+ memcpy(&info->super_copy->super_roots,
+ &info->super_for_commit->super_roots,
+ sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
+}
+
+/*
+ * this copies info out of the root backup array and back into
+ * the in-memory super block. It is meant to help iterate through
+ * the array, so you send it the number of backups you've already
+ * tried and the last backup index you used.
+ *
+ * this returns -1 when it has tried all the backups
+ */
+static noinline int next_root_backup(struct btrfs_fs_info *info,
+ struct btrfs_super_block *super,
+ int *num_backups_tried, int *backup_index)
+{
+ struct btrfs_root_backup *root_backup;
+ int newest = *backup_index;
+
+ if (*num_backups_tried == 0) {
+ u64 gen = btrfs_super_generation(super);
+
+ newest = find_newest_super_backup(info, gen);
+ if (newest == -1)
+ return -1;
+
+ *backup_index = newest;
+ *num_backups_tried = 1;
+ } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
+ /* we've tried all the backups, all done */
+ return -1;
+ } else {
+ /* jump to the next oldest backup */
+ newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
+ BTRFS_NUM_BACKUP_ROOTS;
+ *backup_index = newest;
+ *num_backups_tried += 1;
+ }
+ root_backup = super->super_roots + newest;
+
+ btrfs_set_super_generation(super,
+ btrfs_backup_tree_root_gen(root_backup));
+ btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
+ btrfs_set_super_root_level(super,
+ btrfs_backup_tree_root_level(root_backup));
+ btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
+
+ /*
+ * fixme: the total bytes and num_devices need to match or we should
+ * need a fsck
+ */
+ btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
+ btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
+ return 0;
+}
+
+/* helper to cleanup workers */
+static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
+{
+ btrfs_destroy_workqueue(fs_info->fixup_workers);
+ btrfs_destroy_workqueue(fs_info->delalloc_workers);
+ btrfs_destroy_workqueue(fs_info->workers);
+ btrfs_destroy_workqueue(fs_info->endio_workers);
+ btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
+ btrfs_destroy_workqueue(fs_info->endio_repair_workers);
+ btrfs_destroy_workqueue(fs_info->rmw_workers);
+ btrfs_destroy_workqueue(fs_info->endio_write_workers);
+ btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
+ btrfs_destroy_workqueue(fs_info->submit_workers);
+ btrfs_destroy_workqueue(fs_info->delayed_workers);
+ btrfs_destroy_workqueue(fs_info->caching_workers);
+ btrfs_destroy_workqueue(fs_info->readahead_workers);
+ btrfs_destroy_workqueue(fs_info->flush_workers);
+ btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
+ btrfs_destroy_workqueue(fs_info->extent_workers);
+ /*
+ * Now that all other work queues are destroyed, we can safely destroy
+ * the queues used for metadata I/O, since tasks from those other work
+ * queues can do metadata I/O operations.
+ */
+ btrfs_destroy_workqueue(fs_info->endio_meta_workers);
+ btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
+}
+
+static void free_root_extent_buffers(struct btrfs_root *root)
+{
+ if (root) {
+ free_extent_buffer(root->node);
+ free_extent_buffer(root->commit_root);
+ root->node = NULL;
+ root->commit_root = NULL;
+ }
+}
+
+/* helper to cleanup tree roots */
+static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
+{
+ free_root_extent_buffers(info->tree_root);
+
+ free_root_extent_buffers(info->dev_root);
+ free_root_extent_buffers(info->extent_root);
+ free_root_extent_buffers(info->csum_root);
+ free_root_extent_buffers(info->quota_root);
+ free_root_extent_buffers(info->uuid_root);
+ if (chunk_root)
+ free_root_extent_buffers(info->chunk_root);
+ free_root_extent_buffers(info->free_space_root);
+}
+
+void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
+{
+ int ret;
+ struct btrfs_root *gang[8];
+ int i;
+
+ while (!list_empty(&fs_info->dead_roots)) {
+ gang[0] = list_entry(fs_info->dead_roots.next,
+ struct btrfs_root, root_list);
+ list_del(&gang[0]->root_list);
+
+ if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) {
+ btrfs_drop_and_free_fs_root(fs_info, gang[0]);
+ } else {
+ free_extent_buffer(gang[0]->node);
+ free_extent_buffer(gang[0]->commit_root);
+ btrfs_put_fs_root(gang[0]);
+ }
+ }
+
+ while (1) {
+ ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
+ (void **)gang, 0,
+ ARRAY_SIZE(gang));
+ if (!ret)
+ break;
+ for (i = 0; i < ret; i++)
+ btrfs_drop_and_free_fs_root(fs_info, gang[i]);
+ }
+
+ if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
+ btrfs_free_log_root_tree(NULL, fs_info);
+ btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
+ }
+}
+
+static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
+{
+ mutex_init(&fs_info->scrub_lock);
+ atomic_set(&fs_info->scrubs_running, 0);
+ atomic_set(&fs_info->scrub_pause_req, 0);
+ atomic_set(&fs_info->scrubs_paused, 0);
+ atomic_set(&fs_info->scrub_cancel_req, 0);
+ init_waitqueue_head(&fs_info->scrub_pause_wait);
+ fs_info->scrub_workers_refcnt = 0;
+}
+
+static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
+{
+ spin_lock_init(&fs_info->balance_lock);
+ mutex_init(&fs_info->balance_mutex);
+ atomic_set(&fs_info->balance_pause_req, 0);
+ atomic_set(&fs_info->balance_cancel_req, 0);
+ fs_info->balance_ctl = NULL;
+ init_waitqueue_head(&fs_info->balance_wait_q);
+}
+
+static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
+{
+ struct inode *inode = fs_info->btree_inode;
+
+ inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
+ set_nlink(inode, 1);
+ /*
+ * we set the i_size on the btree inode to the max possible int.
+ * the real end of the address space is determined by all of
+ * the devices in the system
+ */
+ inode->i_size = OFFSET_MAX;
+ inode->i_mapping->a_ops = &btree_aops;
+
+ RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
+ extent_io_tree_init(&BTRFS_I(inode)->io_tree, inode);
+ BTRFS_I(inode)->io_tree.track_uptodate = 0;
+ extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
+
+ BTRFS_I(inode)->io_tree.ops = &btree_extent_io_ops;
+
+ BTRFS_I(inode)->root = fs_info->tree_root;
+ memset(&BTRFS_I(inode)->location, 0, sizeof(struct btrfs_key));
+ set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
+ btrfs_insert_inode_hash(inode);
+}
+
+static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
+{
+ mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
+ rwlock_init(&fs_info->dev_replace.lock);
+ atomic_set(&fs_info->dev_replace.read_locks, 0);
+ atomic_set(&fs_info->dev_replace.blocking_readers, 0);
+ init_waitqueue_head(&fs_info->replace_wait);
+ init_waitqueue_head(&fs_info->dev_replace.read_lock_wq);
+}
+
+static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
+{
+ spin_lock_init(&fs_info->qgroup_lock);
+ mutex_init(&fs_info->qgroup_ioctl_lock);
+ fs_info->qgroup_tree = RB_ROOT;
+ fs_info->qgroup_op_tree = RB_ROOT;
+ INIT_LIST_HEAD(&fs_info->dirty_qgroups);
+ fs_info->qgroup_seq = 1;
+ fs_info->qgroup_ulist = NULL;
+ fs_info->qgroup_rescan_running = false;
+ mutex_init(&fs_info->qgroup_rescan_lock);
+}
+
+static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
+ struct btrfs_fs_devices *fs_devices)
+{
+ u32 max_active = fs_info->thread_pool_size;
+ unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
+
+ fs_info->workers =
+ btrfs_alloc_workqueue(fs_info, "worker",
+ flags | WQ_HIGHPRI, max_active, 16);
+
+ fs_info->delalloc_workers =
+ btrfs_alloc_workqueue(fs_info, "delalloc",
+ flags, max_active, 2);
+
+ fs_info->flush_workers =
+ btrfs_alloc_workqueue(fs_info, "flush_delalloc",
+ flags, max_active, 0);
+
+ fs_info->caching_workers =
+ btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
+
+ /*
+ * a higher idle thresh on the submit workers makes it much more
+ * likely that bios will be send down in a sane order to the
+ * devices
+ */
+ fs_info->submit_workers =
+ btrfs_alloc_workqueue(fs_info, "submit", flags,
+ min_t(u64, fs_devices->num_devices,
+ max_active), 64);
+
+ fs_info->fixup_workers =
+ btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
+
+ /*
+ * endios are largely parallel and should have a very
+ * low idle thresh
+ */
+ fs_info->endio_workers =
+ btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4);
+ fs_info->endio_meta_workers =
+ btrfs_alloc_workqueue(fs_info, "endio-meta", flags,
+ max_active, 4);
+ fs_info->endio_meta_write_workers =
+ btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags,
+ max_active, 2);
+ fs_info->endio_raid56_workers =
+ btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
+ max_active, 4);
+ fs_info->endio_repair_workers =
+ btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0);
+ fs_info->rmw_workers =
+ btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
+ fs_info->endio_write_workers =
+ btrfs_alloc_workqueue(fs_info, "endio-write", flags,
+ max_active, 2);
+ fs_info->endio_freespace_worker =
+ btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
+ max_active, 0);
+ fs_info->delayed_workers =
+ btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
+ max_active, 0);
+ fs_info->readahead_workers =
+ btrfs_alloc_workqueue(fs_info, "readahead", flags,
+ max_active, 2);
+ fs_info->qgroup_rescan_workers =
+ btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
+ fs_info->extent_workers =
+ btrfs_alloc_workqueue(fs_info, "extent-refs", flags,
+ min_t(u64, fs_devices->num_devices,
+ max_active), 8);
+
+ if (!(fs_info->workers && fs_info->delalloc_workers &&
+ fs_info->submit_workers && fs_info->flush_workers &&
+ fs_info->endio_workers && fs_info->endio_meta_workers &&
+ fs_info->endio_meta_write_workers &&
+ fs_info->endio_repair_workers &&
+ fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
+ fs_info->endio_freespace_worker && fs_info->rmw_workers &&
+ fs_info->caching_workers && fs_info->readahead_workers &&
+ fs_info->fixup_workers && fs_info->delayed_workers &&
+ fs_info->extent_workers &&
+ fs_info->qgroup_rescan_workers)) {
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
+ struct btrfs_fs_devices *fs_devices)
+{
+ int ret;
+ struct btrfs_root *log_tree_root;
+ struct btrfs_super_block *disk_super = fs_info->super_copy;
+ u64 bytenr = btrfs_super_log_root(disk_super);
+ int level = btrfs_super_log_root_level(disk_super);
+
+ if (fs_devices->rw_devices == 0) {
+ btrfs_warn(fs_info, "log replay required on RO media");
+ return -EIO;
+ }
+
+ log_tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
+ if (!log_tree_root)
+ return -ENOMEM;
+
+ __setup_root(log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
+
+ log_tree_root->node = read_tree_block(fs_info, bytenr,
+ fs_info->generation + 1,
+ level, NULL);
+ if (IS_ERR(log_tree_root->node)) {
+ btrfs_warn(fs_info, "failed to read log tree");
+ ret = PTR_ERR(log_tree_root->node);
+ kfree(log_tree_root);
+ return ret;
+ } else if (!extent_buffer_uptodate(log_tree_root->node)) {
+ btrfs_err(fs_info, "failed to read log tree");
+ free_extent_buffer(log_tree_root->node);
+ kfree(log_tree_root);
+ return -EIO;
+ }
+ /* returns with log_tree_root freed on success */
+ ret = btrfs_recover_log_trees(log_tree_root);
+ if (ret) {
+ btrfs_handle_fs_error(fs_info, ret,
+ "Failed to recover log tree");
+ free_extent_buffer(log_tree_root->node);
+ kfree(log_tree_root);
+ return ret;
+ }
+
+ if (sb_rdonly(fs_info->sb)) {
+ ret = btrfs_commit_super(fs_info);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *tree_root = fs_info->tree_root;
+ struct btrfs_root *root;
+ struct btrfs_key location;
+ int ret;
+
+ BUG_ON(!fs_info->tree_root);
+
+ location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
+ location.type = BTRFS_ROOT_ITEM_KEY;
+ location.offset = 0;
+
+ root = btrfs_read_tree_root(tree_root, &location);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
+ goto out;
+ }
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+ fs_info->extent_root = root;
+
+ location.objectid = BTRFS_DEV_TREE_OBJECTID;
+ root = btrfs_read_tree_root(tree_root, &location);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
+ goto out;
+ }
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+ fs_info->dev_root = root;
+ btrfs_init_devices_late(fs_info);
+
+ location.objectid = BTRFS_CSUM_TREE_OBJECTID;
+ root = btrfs_read_tree_root(tree_root, &location);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
+ goto out;
+ }
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+ fs_info->csum_root = root;
+
+ location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
+ root = btrfs_read_tree_root(tree_root, &location);
+ if (!IS_ERR(root)) {
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+ set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
+ fs_info->quota_root = root;
+ }
+
+ location.objectid = BTRFS_UUID_TREE_OBJECTID;
+ root = btrfs_read_tree_root(tree_root, &location);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
+ if (ret != -ENOENT)
+ goto out;
+ } else {
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+ fs_info->uuid_root = root;
+ }
+
+ if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
+ location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
+ root = btrfs_read_tree_root(tree_root, &location);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
+ goto out;
+ }
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+ fs_info->free_space_root = root;
+ }
+
+ return 0;
+out:
+ btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
+ location.objectid, ret);
+ return ret;
+}
+
+/*
+ * Real super block validation
+ * NOTE: super csum type and incompat features will not be checked here.
+ *
+ * @sb: super block to check
+ * @mirror_num: the super block number to check its bytenr:
+ * 0 the primary (1st) sb
+ * 1, 2 2nd and 3rd backup copy
+ * -1 skip bytenr check
+ */
+static int validate_super(struct btrfs_fs_info *fs_info,
+ struct btrfs_super_block *sb, int mirror_num)
+{
+ u64 nodesize = btrfs_super_nodesize(sb);
+ u64 sectorsize = btrfs_super_sectorsize(sb);
+ int ret = 0;
+
+ if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
+ btrfs_err(fs_info, "no valid FS found");
+ ret = -EINVAL;
+ }
+ if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
+ btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
+ btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
+ ret = -EINVAL;
+ }
+ if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ btrfs_err(fs_info, "tree_root level too big: %d >= %d",
+ btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
+ ret = -EINVAL;
+ }
+ if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
+ btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
+ ret = -EINVAL;
+ }
+ if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ btrfs_err(fs_info, "log_root level too big: %d >= %d",
+ btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
+ ret = -EINVAL;
+ }
+
+ /*
+ * Check sectorsize and nodesize first, other check will need it.
+ * Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
+ */
+ if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
+ sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
+ btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
+ ret = -EINVAL;
+ }
+ /* Only PAGE SIZE is supported yet */
+ if (sectorsize != PAGE_SIZE) {
+ btrfs_err(fs_info,
+ "sectorsize %llu not supported yet, only support %lu",
+ sectorsize, PAGE_SIZE);
+ ret = -EINVAL;
+ }
+ if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
+ nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
+ btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
+ ret = -EINVAL;
+ }
+ if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
+ btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
+ le32_to_cpu(sb->__unused_leafsize), nodesize);
+ ret = -EINVAL;
+ }
+
+ /* Root alignment check */
+ if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
+ btrfs_warn(fs_info, "tree_root block unaligned: %llu",
+ btrfs_super_root(sb));
+ ret = -EINVAL;
+ }
+ if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
+ btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
+ btrfs_super_chunk_root(sb));
+ ret = -EINVAL;
+ }
+ if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
+ btrfs_warn(fs_info, "log_root block unaligned: %llu",
+ btrfs_super_log_root(sb));
+ ret = -EINVAL;
+ }
+
+ if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_FSID_SIZE) != 0) {
+ btrfs_err(fs_info,
+ "dev_item UUID does not match fsid: %pU != %pU",
+ fs_info->fsid, sb->dev_item.fsid);
+ ret = -EINVAL;
+ }
+
+ /*
+ * Hint to catch really bogus numbers, bitflips or so, more exact checks are
+ * done later
+ */
+ if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
+ btrfs_err(fs_info, "bytes_used is too small %llu",
+ btrfs_super_bytes_used(sb));
+ ret = -EINVAL;
+ }
+ if (!is_power_of_2(btrfs_super_stripesize(sb))) {
+ btrfs_err(fs_info, "invalid stripesize %u",
+ btrfs_super_stripesize(sb));
+ ret = -EINVAL;
+ }
+ if (btrfs_super_num_devices(sb) > (1UL << 31))
+ btrfs_warn(fs_info, "suspicious number of devices: %llu",
+ btrfs_super_num_devices(sb));
+ if (btrfs_super_num_devices(sb) == 0) {
+ btrfs_err(fs_info, "number of devices is 0");
+ ret = -EINVAL;
+ }
+
+ if (mirror_num >= 0 &&
+ btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
+ btrfs_err(fs_info, "super offset mismatch %llu != %u",
+ btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
+ ret = -EINVAL;
+ }
+
+ /*
+ * Obvious sys_chunk_array corruptions, it must hold at least one key
+ * and one chunk
+ */
+ if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
+ btrfs_err(fs_info, "system chunk array too big %u > %u",
+ btrfs_super_sys_array_size(sb),
+ BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
+ ret = -EINVAL;
+ }
+ if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
+ + sizeof(struct btrfs_chunk)) {
+ btrfs_err(fs_info, "system chunk array too small %u < %zu",
+ btrfs_super_sys_array_size(sb),
+ sizeof(struct btrfs_disk_key)
+ + sizeof(struct btrfs_chunk));
+ ret = -EINVAL;
+ }
+
+ /*
+ * The generation is a global counter, we'll trust it more than the others
+ * but it's still possible that it's the one that's wrong.
+ */
+ if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
+ btrfs_warn(fs_info,
+ "suspicious: generation < chunk_root_generation: %llu < %llu",
+ btrfs_super_generation(sb),
+ btrfs_super_chunk_root_generation(sb));
+ if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
+ && btrfs_super_cache_generation(sb) != (u64)-1)
+ btrfs_warn(fs_info,
+ "suspicious: generation < cache_generation: %llu < %llu",
+ btrfs_super_generation(sb),
+ btrfs_super_cache_generation(sb));
+
+ return ret;
+}
+
+/*
+ * Validation of super block at mount time.
+ * Some checks already done early at mount time, like csum type and incompat
+ * flags will be skipped.
+ */
+static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
+{
+ return validate_super(fs_info, fs_info->super_copy, 0);
+}
+
+/*
+ * Validation of super block at write time.
+ * Some checks like bytenr check will be skipped as their values will be
+ * overwritten soon.
+ * Extra checks like csum type and incompat flags will be done here.
+ */
+static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
+ struct btrfs_super_block *sb)
+{
+ int ret;
+
+ ret = validate_super(fs_info, sb, -1);
+ if (ret < 0)
+ goto out;
+ if (btrfs_super_csum_type(sb) != BTRFS_CSUM_TYPE_CRC32) {
+ ret = -EUCLEAN;
+ btrfs_err(fs_info, "invalid csum type, has %u want %u",
+ btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
+ goto out;
+ }
+ if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
+ ret = -EUCLEAN;
+ btrfs_err(fs_info,
+ "invalid incompat flags, has 0x%llx valid mask 0x%llx",
+ btrfs_super_incompat_flags(sb),
+ (unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
+ goto out;
+ }
+out:
+ if (ret < 0)
+ btrfs_err(fs_info,
+ "super block corruption detected before writing it to disk");
+ return ret;
+}
+
+int open_ctree(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices,
+ char *options)
+{
+ u32 sectorsize;
+ u32 nodesize;
+ u32 stripesize;
+ u64 generation;
+ u64 features;
+ struct btrfs_key location;
+ struct buffer_head *bh;
+ struct btrfs_super_block *disk_super;
+ struct btrfs_fs_info *fs_info = btrfs_sb(sb);
+ struct btrfs_root *tree_root;
+ struct btrfs_root *chunk_root;
+ int ret;
+ int err = -EINVAL;
+ int num_backups_tried = 0;
+ int backup_index = 0;
+ int clear_free_space_tree = 0;
+ int level;
+
+ tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
+ chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
+ if (!tree_root || !chunk_root) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ ret = init_srcu_struct(&fs_info->subvol_srcu);
+ if (ret) {
+ err = ret;
+ goto fail;
+ }
+
+ ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
+ if (ret) {
+ err = ret;
+ goto fail_srcu;
+ }
+ fs_info->dirty_metadata_batch = PAGE_SIZE *
+ (1 + ilog2(nr_cpu_ids));
+
+ ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
+ if (ret) {
+ err = ret;
+ goto fail_dirty_metadata_bytes;
+ }
+
+ ret = percpu_counter_init(&fs_info->bio_counter, 0, GFP_KERNEL);
+ if (ret) {
+ err = ret;
+ goto fail_delalloc_bytes;
+ }
+
+ INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
+ INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
+ INIT_LIST_HEAD(&fs_info->trans_list);
+ INIT_LIST_HEAD(&fs_info->dead_roots);
+ INIT_LIST_HEAD(&fs_info->delayed_iputs);
+ INIT_LIST_HEAD(&fs_info->delalloc_roots);
+ INIT_LIST_HEAD(&fs_info->caching_block_groups);
+ INIT_LIST_HEAD(&fs_info->pending_raid_kobjs);
+ spin_lock_init(&fs_info->pending_raid_kobjs_lock);
+ spin_lock_init(&fs_info->delalloc_root_lock);
+ spin_lock_init(&fs_info->trans_lock);
+ spin_lock_init(&fs_info->fs_roots_radix_lock);
+ spin_lock_init(&fs_info->delayed_iput_lock);
+ spin_lock_init(&fs_info->defrag_inodes_lock);
+ spin_lock_init(&fs_info->tree_mod_seq_lock);
+ spin_lock_init(&fs_info->super_lock);
+ spin_lock_init(&fs_info->qgroup_op_lock);
+ spin_lock_init(&fs_info->buffer_lock);
+ spin_lock_init(&fs_info->unused_bgs_lock);
+ rwlock_init(&fs_info->tree_mod_log_lock);
+ mutex_init(&fs_info->unused_bg_unpin_mutex);
+ mutex_init(&fs_info->delete_unused_bgs_mutex);
+ mutex_init(&fs_info->reloc_mutex);
+ mutex_init(&fs_info->delalloc_root_mutex);
+ mutex_init(&fs_info->cleaner_delayed_iput_mutex);
+ seqlock_init(&fs_info->profiles_lock);
+
+ INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
+ INIT_LIST_HEAD(&fs_info->space_info);
+ INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
+ INIT_LIST_HEAD(&fs_info->unused_bgs);
+ btrfs_mapping_init(&fs_info->mapping_tree);
+ btrfs_init_block_rsv(&fs_info->global_block_rsv,
+ BTRFS_BLOCK_RSV_GLOBAL);
+ btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
+ btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
+ btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
+ btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
+ BTRFS_BLOCK_RSV_DELOPS);
+ atomic_set(&fs_info->async_delalloc_pages, 0);
+ atomic_set(&fs_info->defrag_running, 0);
+ atomic_set(&fs_info->qgroup_op_seq, 0);
+ atomic_set(&fs_info->reada_works_cnt, 0);
+ atomic64_set(&fs_info->tree_mod_seq, 0);
+ fs_info->sb = sb;
+ fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
+ fs_info->metadata_ratio = 0;
+ fs_info->defrag_inodes = RB_ROOT;
+ atomic64_set(&fs_info->free_chunk_space, 0);
+ fs_info->tree_mod_log = RB_ROOT;
+ fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
+ fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
+ /* readahead state */
+ INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
+ spin_lock_init(&fs_info->reada_lock);
+ btrfs_init_ref_verify(fs_info);
+
+ fs_info->thread_pool_size = min_t(unsigned long,
+ num_online_cpus() + 2, 8);
+
+ INIT_LIST_HEAD(&fs_info->ordered_roots);
+ spin_lock_init(&fs_info->ordered_root_lock);
+
+ fs_info->btree_inode = new_inode(sb);
+ if (!fs_info->btree_inode) {
+ err = -ENOMEM;
+ goto fail_bio_counter;
+ }
+ mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
+
+ fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
+ GFP_KERNEL);
+ if (!fs_info->delayed_root) {
+ err = -ENOMEM;
+ goto fail_iput;
+ }
+ btrfs_init_delayed_root(fs_info->delayed_root);
+
+ btrfs_init_scrub(fs_info);
+#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
+ fs_info->check_integrity_print_mask = 0;
+#endif
+ btrfs_init_balance(fs_info);
+ btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
+
+ sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
+ sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
+
+ btrfs_init_btree_inode(fs_info);
+
+ spin_lock_init(&fs_info->block_group_cache_lock);
+ fs_info->block_group_cache_tree = RB_ROOT;
+ fs_info->first_logical_byte = (u64)-1;
+
+ extent_io_tree_init(&fs_info->freed_extents[0], NULL);
+ extent_io_tree_init(&fs_info->freed_extents[1], NULL);
+ fs_info->pinned_extents = &fs_info->freed_extents[0];
+ set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
+
+ mutex_init(&fs_info->ordered_operations_mutex);
+ mutex_init(&fs_info->tree_log_mutex);
+ mutex_init(&fs_info->chunk_mutex);
+ mutex_init(&fs_info->transaction_kthread_mutex);
+ mutex_init(&fs_info->cleaner_mutex);
+ mutex_init(&fs_info->ro_block_group_mutex);
+ init_rwsem(&fs_info->commit_root_sem);
+ init_rwsem(&fs_info->cleanup_work_sem);
+ init_rwsem(&fs_info->subvol_sem);
+ sema_init(&fs_info->uuid_tree_rescan_sem, 1);
+
+ btrfs_init_dev_replace_locks(fs_info);
+ btrfs_init_qgroup(fs_info);
+
+ btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
+ btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
+
+ init_waitqueue_head(&fs_info->transaction_throttle);
+ init_waitqueue_head(&fs_info->transaction_wait);
+ init_waitqueue_head(&fs_info->transaction_blocked_wait);
+ init_waitqueue_head(&fs_info->async_submit_wait);
+
+ INIT_LIST_HEAD(&fs_info->pinned_chunks);
+
+ /* Usable values until the real ones are cached from the superblock */
+ fs_info->nodesize = 4096;
+ fs_info->sectorsize = 4096;
+ fs_info->stripesize = 4096;
+
+ ret = btrfs_alloc_stripe_hash_table(fs_info);
+ if (ret) {
+ err = ret;
+ goto fail_alloc;
+ }
+
+ __setup_root(tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
+
+ invalidate_bdev(fs_devices->latest_bdev);
+
+ /*
+ * Read super block and check the signature bytes only
+ */
+ bh = btrfs_read_dev_super(fs_devices->latest_bdev);
+ if (IS_ERR(bh)) {
+ err = PTR_ERR(bh);
+ goto fail_alloc;
+ }
+
+ /*
+ * We want to check superblock checksum, the type is stored inside.
+ * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
+ */
+ if (btrfs_check_super_csum(fs_info, bh->b_data)) {
+ btrfs_err(fs_info, "superblock checksum mismatch");
+ err = -EINVAL;
+ brelse(bh);
+ goto fail_alloc;
+ }
+
+ /*
+ * super_copy is zeroed at allocation time and we never touch the
+ * following bytes up to INFO_SIZE, the checksum is calculated from
+ * the whole block of INFO_SIZE
+ */
+ memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
+ memcpy(fs_info->super_for_commit, fs_info->super_copy,
+ sizeof(*fs_info->super_for_commit));
+ brelse(bh);
+
+ memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
+
+ ret = btrfs_validate_mount_super(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "superblock contains fatal errors");
+ err = -EINVAL;
+ goto fail_alloc;
+ }
+
+ disk_super = fs_info->super_copy;
+ if (!btrfs_super_root(disk_super))
+ goto fail_alloc;
+
+ /* check FS state, whether FS is broken. */
+ if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
+ set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
+
+ /*
+ * run through our array of backup supers and setup
+ * our ring pointer to the oldest one
+ */
+ generation = btrfs_super_generation(disk_super);
+ find_oldest_super_backup(fs_info, generation);
+
+ /*
+ * In the long term, we'll store the compression type in the super
+ * block, and it'll be used for per file compression control.
+ */
+ fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
+
+ ret = btrfs_parse_options(fs_info, options, sb->s_flags);
+ if (ret) {
+ err = ret;
+ goto fail_alloc;
+ }
+
+ features = btrfs_super_incompat_flags(disk_super) &
+ ~BTRFS_FEATURE_INCOMPAT_SUPP;
+ if (features) {
+ btrfs_err(fs_info,
+ "cannot mount because of unsupported optional features (%llx)",
+ features);
+ err = -EINVAL;
+ goto fail_alloc;
+ }
+
+ features = btrfs_super_incompat_flags(disk_super);
+ features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
+ if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
+ features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
+ else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
+ features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
+
+ if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
+ btrfs_info(fs_info, "has skinny extents");
+
+ /*
+ * flag our filesystem as having big metadata blocks if
+ * they are bigger than the page size
+ */
+ if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
+ if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
+ btrfs_info(fs_info,
+ "flagging fs with big metadata feature");
+ features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
+ }
+
+ nodesize = btrfs_super_nodesize(disk_super);
+ sectorsize = btrfs_super_sectorsize(disk_super);
+ stripesize = sectorsize;
+ fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
+ fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
+
+ /* Cache block sizes */
+ fs_info->nodesize = nodesize;
+ fs_info->sectorsize = sectorsize;
+ fs_info->stripesize = stripesize;
+
+ /*
+ * mixed block groups end up with duplicate but slightly offset
+ * extent buffers for the same range. It leads to corruptions
+ */
+ if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
+ (sectorsize != nodesize)) {
+ btrfs_err(fs_info,
+"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
+ nodesize, sectorsize);
+ goto fail_alloc;
+ }
+
+ /*
+ * Needn't use the lock because there is no other task which will
+ * update the flag.
+ */
+ btrfs_set_super_incompat_flags(disk_super, features);
+
+ features = btrfs_super_compat_ro_flags(disk_super) &
+ ~BTRFS_FEATURE_COMPAT_RO_SUPP;
+ if (!sb_rdonly(sb) && features) {
+ btrfs_err(fs_info,
+ "cannot mount read-write because of unsupported optional features (%llx)",
+ features);
+ err = -EINVAL;
+ goto fail_alloc;
+ }
+
+ ret = btrfs_init_workqueues(fs_info, fs_devices);
+ if (ret) {
+ err = ret;
+ goto fail_sb_buffer;
+ }
+
+ sb->s_bdi->congested_fn = btrfs_congested_fn;
+ sb->s_bdi->congested_data = fs_info;
+ sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
+ sb->s_bdi->ra_pages = VM_MAX_READAHEAD * SZ_1K / PAGE_SIZE;
+ sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
+ sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
+
+ sb->s_blocksize = sectorsize;
+ sb->s_blocksize_bits = blksize_bits(sectorsize);
+ memcpy(&sb->s_uuid, fs_info->fsid, BTRFS_FSID_SIZE);
+
+ mutex_lock(&fs_info->chunk_mutex);
+ ret = btrfs_read_sys_array(fs_info);
+ mutex_unlock(&fs_info->chunk_mutex);
+ if (ret) {
+ btrfs_err(fs_info, "failed to read the system array: %d", ret);
+ goto fail_sb_buffer;
+ }
+
+ generation = btrfs_super_chunk_root_generation(disk_super);
+ level = btrfs_super_chunk_root_level(disk_super);
+
+ __setup_root(chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
+
+ chunk_root->node = read_tree_block(fs_info,
+ btrfs_super_chunk_root(disk_super),
+ generation, level, NULL);
+ if (IS_ERR(chunk_root->node) ||
+ !extent_buffer_uptodate(chunk_root->node)) {
+ btrfs_err(fs_info, "failed to read chunk root");
+ if (!IS_ERR(chunk_root->node))
+ free_extent_buffer(chunk_root->node);
+ chunk_root->node = NULL;
+ goto fail_tree_roots;
+ }
+ btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
+ chunk_root->commit_root = btrfs_root_node(chunk_root);
+
+ read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
+
+ ret = btrfs_read_chunk_tree(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
+ goto fail_tree_roots;
+ }
+
+ /*
+ * Keep the devid that is marked to be the target device for the
+ * device replace procedure
+ */
+ btrfs_free_extra_devids(fs_devices, 0);
+
+ if (!fs_devices->latest_bdev) {
+ btrfs_err(fs_info, "failed to read devices");
+ goto fail_tree_roots;
+ }
+
+retry_root_backup:
+ generation = btrfs_super_generation(disk_super);
+ level = btrfs_super_root_level(disk_super);
+
+ tree_root->node = read_tree_block(fs_info,
+ btrfs_super_root(disk_super),
+ generation, level, NULL);
+ if (IS_ERR(tree_root->node) ||
+ !extent_buffer_uptodate(tree_root->node)) {
+ btrfs_warn(fs_info, "failed to read tree root");
+ if (!IS_ERR(tree_root->node))
+ free_extent_buffer(tree_root->node);
+ tree_root->node = NULL;
+ goto recovery_tree_root;
+ }
+
+ btrfs_set_root_node(&tree_root->root_item, tree_root->node);
+ tree_root->commit_root = btrfs_root_node(tree_root);
+ btrfs_set_root_refs(&tree_root->root_item, 1);
+
+ mutex_lock(&tree_root->objectid_mutex);
+ ret = btrfs_find_highest_objectid(tree_root,
+ &tree_root->highest_objectid);
+ if (ret) {
+ mutex_unlock(&tree_root->objectid_mutex);
+ goto recovery_tree_root;
+ }
+
+ ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
+
+ mutex_unlock(&tree_root->objectid_mutex);
+
+ ret = btrfs_read_roots(fs_info);
+ if (ret)
+ goto recovery_tree_root;
+
+ fs_info->generation = generation;
+ fs_info->last_trans_committed = generation;
+
+ ret = btrfs_verify_dev_extents(fs_info);
+ if (ret) {
+ btrfs_err(fs_info,
+ "failed to verify dev extents against chunks: %d",
+ ret);
+ goto fail_block_groups;
+ }
+ ret = btrfs_recover_balance(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "failed to recover balance: %d", ret);
+ goto fail_block_groups;
+ }
+
+ ret = btrfs_init_dev_stats(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
+ goto fail_block_groups;
+ }
+
+ ret = btrfs_init_dev_replace(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
+ goto fail_block_groups;
+ }
+
+ btrfs_free_extra_devids(fs_devices, 1);
+
+ ret = btrfs_sysfs_add_fsid(fs_devices, NULL);
+ if (ret) {
+ btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
+ ret);
+ goto fail_block_groups;
+ }
+
+ ret = btrfs_sysfs_add_device(fs_devices);
+ if (ret) {
+ btrfs_err(fs_info, "failed to init sysfs device interface: %d",
+ ret);
+ goto fail_fsdev_sysfs;
+ }
+
+ ret = btrfs_sysfs_add_mounted(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
+ goto fail_fsdev_sysfs;
+ }
+
+ ret = btrfs_init_space_info(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "failed to initialize space info: %d", ret);
+ goto fail_sysfs;
+ }
+
+ ret = btrfs_read_block_groups(fs_info);
+ if (ret) {
+ btrfs_err(fs_info, "failed to read block groups: %d", ret);
+ goto fail_sysfs;
+ }
+
+ if (!sb_rdonly(sb) && !btrfs_check_rw_degradable(fs_info, NULL)) {
+ btrfs_warn(fs_info,
+ "writeable mount is not allowed due to too many missing devices");
+ goto fail_sysfs;
+ }
+
+ fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
+ "btrfs-cleaner");
+ if (IS_ERR(fs_info->cleaner_kthread))
+ goto fail_sysfs;
+
+ fs_info->transaction_kthread = kthread_run(transaction_kthread,
+ tree_root,
+ "btrfs-transaction");
+ if (IS_ERR(fs_info->transaction_kthread))
+ goto fail_cleaner;
+
+ if (!btrfs_test_opt(fs_info, NOSSD) &&
+ !fs_info->fs_devices->rotating) {
+ btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
+ }
+
+ /*
+ * Mount does not set all options immediately, we can do it now and do
+ * not have to wait for transaction commit
+ */
+ btrfs_apply_pending_changes(fs_info);
+
+#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
+ if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
+ ret = btrfsic_mount(fs_info, fs_devices,
+ btrfs_test_opt(fs_info,
+ CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
+ 1 : 0,
+ fs_info->check_integrity_print_mask);
+ if (ret)
+ btrfs_warn(fs_info,
+ "failed to initialize integrity check module: %d",
+ ret);
+ }
+#endif
+ ret = btrfs_read_qgroup_config(fs_info);
+ if (ret)
+ goto fail_trans_kthread;
+
+ if (btrfs_build_ref_tree(fs_info))
+ btrfs_err(fs_info, "couldn't build ref tree");
+
+ /* do not make disk changes in broken FS or nologreplay is given */
+ if (btrfs_super_log_root(disk_super) != 0 &&
+ !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
+ ret = btrfs_replay_log(fs_info, fs_devices);
+ if (ret) {
+ err = ret;
+ goto fail_qgroup;
+ }
+ }
+
+ ret = btrfs_find_orphan_roots(fs_info);
+ if (ret)
+ goto fail_qgroup;
+
+ if (!sb_rdonly(sb)) {
+ ret = btrfs_cleanup_fs_roots(fs_info);
+ if (ret)
+ goto fail_qgroup;
+
+ mutex_lock(&fs_info->cleaner_mutex);
+ ret = btrfs_recover_relocation(tree_root);
+ mutex_unlock(&fs_info->cleaner_mutex);
+ if (ret < 0) {
+ btrfs_warn(fs_info, "failed to recover relocation: %d",
+ ret);
+ err = -EINVAL;
+ goto fail_qgroup;
+ }
+ }
+
+ location.objectid = BTRFS_FS_TREE_OBJECTID;
+ location.type = BTRFS_ROOT_ITEM_KEY;
+ location.offset = 0;
+
+ fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
+ if (IS_ERR(fs_info->fs_root)) {
+ err = PTR_ERR(fs_info->fs_root);
+ btrfs_warn(fs_info, "failed to read fs tree: %d", err);
+ goto fail_qgroup;
+ }
+
+ if (sb_rdonly(sb))
+ return 0;
+
+ if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
+ btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
+ clear_free_space_tree = 1;
+ } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
+ !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
+ btrfs_warn(fs_info, "free space tree is invalid");
+ clear_free_space_tree = 1;
+ }
+
+ if (clear_free_space_tree) {
+ btrfs_info(fs_info, "clearing free space tree");
+ ret = btrfs_clear_free_space_tree(fs_info);
+ if (ret) {
+ btrfs_warn(fs_info,
+ "failed to clear free space tree: %d", ret);
+ close_ctree(fs_info);
+ return ret;
+ }
+ }
+
+ if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
+ !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
+ btrfs_info(fs_info, "creating free space tree");
+ ret = btrfs_create_free_space_tree(fs_info);
+ if (ret) {
+ btrfs_warn(fs_info,
+ "failed to create free space tree: %d", ret);
+ close_ctree(fs_info);
+ return ret;
+ }
+ }
+
+ down_read(&fs_info->cleanup_work_sem);
+ if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
+ (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
+ up_read(&fs_info->cleanup_work_sem);
+ close_ctree(fs_info);
+ return ret;
+ }
+ up_read(&fs_info->cleanup_work_sem);
+
+ ret = btrfs_resume_balance_async(fs_info);
+ if (ret) {
+ btrfs_warn(fs_info, "failed to resume balance: %d", ret);
+ close_ctree(fs_info);
+ return ret;
+ }
+
+ ret = btrfs_resume_dev_replace_async(fs_info);
+ if (ret) {
+ btrfs_warn(fs_info, "failed to resume device replace: %d", ret);
+ close_ctree(fs_info);
+ return ret;
+ }
+
+ btrfs_qgroup_rescan_resume(fs_info);
+
+ if (!fs_info->uuid_root) {
+ btrfs_info(fs_info, "creating UUID tree");
+ ret = btrfs_create_uuid_tree(fs_info);
+ if (ret) {
+ btrfs_warn(fs_info,
+ "failed to create the UUID tree: %d", ret);
+ close_ctree(fs_info);
+ return ret;
+ }
+ } else if (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
+ fs_info->generation !=
+ btrfs_super_uuid_tree_generation(disk_super)) {
+ btrfs_info(fs_info, "checking UUID tree");
+ ret = btrfs_check_uuid_tree(fs_info);
+ if (ret) {
+ btrfs_warn(fs_info,
+ "failed to check the UUID tree: %d", ret);
+ close_ctree(fs_info);
+ return ret;
+ }
+ } else {
+ set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
+ }
+ set_bit(BTRFS_FS_OPEN, &fs_info->flags);
+
+ /*
+ * backuproot only affect mount behavior, and if open_ctree succeeded,
+ * no need to keep the flag
+ */
+ btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
+
+ return 0;
+
+fail_qgroup:
+ btrfs_free_qgroup_config(fs_info);
+fail_trans_kthread:
+ kthread_stop(fs_info->transaction_kthread);
+ btrfs_cleanup_transaction(fs_info);
+ btrfs_free_fs_roots(fs_info);
+fail_cleaner:
+ kthread_stop(fs_info->cleaner_kthread);
+
+ /*
+ * make sure we're done with the btree inode before we stop our
+ * kthreads
+ */
+ filemap_write_and_wait(fs_info->btree_inode->i_mapping);
+
+fail_sysfs:
+ btrfs_sysfs_remove_mounted(fs_info);
+
+fail_fsdev_sysfs:
+ btrfs_sysfs_remove_fsid(fs_info->fs_devices);
+
+fail_block_groups:
+ btrfs_put_block_group_cache(fs_info);
+
+fail_tree_roots:
+ free_root_pointers(fs_info, 1);
+ invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
+
+fail_sb_buffer:
+ btrfs_stop_all_workers(fs_info);
+ btrfs_free_block_groups(fs_info);
+fail_alloc:
+fail_iput:
+ btrfs_mapping_tree_free(&fs_info->mapping_tree);
+
+ iput(fs_info->btree_inode);
+fail_bio_counter:
+ percpu_counter_destroy(&fs_info->bio_counter);
+fail_delalloc_bytes:
+ percpu_counter_destroy(&fs_info->delalloc_bytes);
+fail_dirty_metadata_bytes:
+ percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
+fail_srcu:
+ cleanup_srcu_struct(&fs_info->subvol_srcu);
+fail:
+ btrfs_free_stripe_hash_table(fs_info);
+ btrfs_close_devices(fs_info->fs_devices);
+ return err;
+
+recovery_tree_root:
+ if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
+ goto fail_tree_roots;
+
+ free_root_pointers(fs_info, 0);
+
+ /* don't use the log in recovery mode, it won't be valid */
+ btrfs_set_super_log_root(disk_super, 0);
+
+ /* we can't trust the free space cache either */
+ btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
+
+ ret = next_root_backup(fs_info, fs_info->super_copy,
+ &num_backups_tried, &backup_index);
+ if (ret == -1)
+ goto fail_block_groups;
+ goto retry_root_backup;
+}
+ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
+
+static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
+{
+ if (uptodate) {
+ set_buffer_uptodate(bh);
+ } else {
+ struct btrfs_device *device = (struct btrfs_device *)
+ bh->b_private;
+
+ btrfs_warn_rl_in_rcu(device->fs_info,
+ "lost page write due to IO error on %s",
+ rcu_str_deref(device->name));
+ /* note, we don't set_buffer_write_io_error because we have
+ * our own ways of dealing with the IO errors
+ */
+ clear_buffer_uptodate(bh);
+ btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
+ }
+ unlock_buffer(bh);
+ put_bh(bh);
+}
+
+int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
+ struct buffer_head **bh_ret)
+{
+ struct buffer_head *bh;
+ struct btrfs_super_block *super;
+ u64 bytenr;
+
+ bytenr = btrfs_sb_offset(copy_num);
+ if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
+ return -EINVAL;
+
+ bh = __bread(bdev, bytenr / BTRFS_BDEV_BLOCKSIZE, BTRFS_SUPER_INFO_SIZE);
+ /*
+ * If we fail to read from the underlying devices, as of now
+ * the best option we have is to mark it EIO.
+ */
+ if (!bh)
+ return -EIO;
+
+ super = (struct btrfs_super_block *)bh->b_data;
+ if (btrfs_super_bytenr(super) != bytenr ||
+ btrfs_super_magic(super) != BTRFS_MAGIC) {
+ brelse(bh);
+ return -EINVAL;
+ }
+
+ *bh_ret = bh;
+ return 0;
+}
+
+
+struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
+{
+ struct buffer_head *bh;
+ struct buffer_head *latest = NULL;
+ struct btrfs_super_block *super;
+ int i;
+ u64 transid = 0;
+ int ret = -EINVAL;
+
+ /* we would like to check all the supers, but that would make
+ * a btrfs mount succeed after a mkfs from a different FS.
+ * So, we need to add a special mount option to scan for
+ * later supers, using BTRFS_SUPER_MIRROR_MAX instead
+ */
+ for (i = 0; i < 1; i++) {
+ ret = btrfs_read_dev_one_super(bdev, i, &bh);
+ if (ret)
+ continue;
+
+ super = (struct btrfs_super_block *)bh->b_data;
+
+ if (!latest || btrfs_super_generation(super) > transid) {
+ brelse(latest);
+ latest = bh;
+ transid = btrfs_super_generation(super);
+ } else {
+ brelse(bh);
+ }
+ }
+
+ if (!latest)
+ return ERR_PTR(ret);
+
+ return latest;
+}
+
+/*
+ * Write superblock @sb to the @device. Do not wait for completion, all the
+ * buffer heads we write are pinned.
+ *
+ * Write @max_mirrors copies of the superblock, where 0 means default that fit
+ * the expected device size at commit time. Note that max_mirrors must be
+ * same for write and wait phases.
+ *
+ * Return number of errors when buffer head is not found or submission fails.
+ */
+static int write_dev_supers(struct btrfs_device *device,
+ struct btrfs_super_block *sb, int max_mirrors)
+{
+ struct buffer_head *bh;
+ int i;
+ int ret;
+ int errors = 0;
+ u32 crc;
+ u64 bytenr;
+ int op_flags;
+
+ if (max_mirrors == 0)
+ max_mirrors = BTRFS_SUPER_MIRROR_MAX;
+
+ for (i = 0; i < max_mirrors; i++) {
+ bytenr = btrfs_sb_offset(i);
+ if (bytenr + BTRFS_SUPER_INFO_SIZE >=
+ device->commit_total_bytes)
+ break;
+
+ btrfs_set_super_bytenr(sb, bytenr);
+
+ crc = ~(u32)0;
+ crc = btrfs_csum_data((const char *)sb + BTRFS_CSUM_SIZE, crc,
+ BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, sb->csum);
+
+ /* One reference for us, and we leave it for the caller */
+ bh = __getblk(device->bdev, bytenr / BTRFS_BDEV_BLOCKSIZE,
+ BTRFS_SUPER_INFO_SIZE);
+ if (!bh) {
+ btrfs_err(device->fs_info,
+ "couldn't get super buffer head for bytenr %llu",
+ bytenr);
+ errors++;
+ continue;
+ }
+
+ memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
+
+ /* one reference for submit_bh */
+ get_bh(bh);
+
+ set_buffer_uptodate(bh);
+ lock_buffer(bh);
+ bh->b_end_io = btrfs_end_buffer_write_sync;
+ bh->b_private = device;
+
+ /*
+ * we fua the first super. The others we allow
+ * to go down lazy.
+ */
+ op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
+ if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
+ op_flags |= REQ_FUA;
+ ret = btrfsic_submit_bh(REQ_OP_WRITE, op_flags, bh);
+ if (ret)
+ errors++;
+ }
+ return errors < i ? 0 : -1;
+}
+
+/*
+ * Wait for write completion of superblocks done by write_dev_supers,
+ * @max_mirrors same for write and wait phases.
+ *
+ * Return number of errors when buffer head is not found or not marked up to
+ * date.
+ */
+static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
+{
+ struct buffer_head *bh;
+ int i;
+ int errors = 0;
+ bool primary_failed = false;
+ u64 bytenr;
+
+ if (max_mirrors == 0)
+ max_mirrors = BTRFS_SUPER_MIRROR_MAX;
+
+ for (i = 0; i < max_mirrors; i++) {
+ bytenr = btrfs_sb_offset(i);
+ if (bytenr + BTRFS_SUPER_INFO_SIZE >=
+ device->commit_total_bytes)
+ break;
+
+ bh = __find_get_block(device->bdev,
+ bytenr / BTRFS_BDEV_BLOCKSIZE,
+ BTRFS_SUPER_INFO_SIZE);
+ if (!bh) {
+ errors++;
+ if (i == 0)
+ primary_failed = true;
+ continue;
+ }
+ wait_on_buffer(bh);
+ if (!buffer_uptodate(bh)) {
+ errors++;
+ if (i == 0)
+ primary_failed = true;
+ }
+
+ /* drop our reference */
+ brelse(bh);
+
+ /* drop the reference from the writing run */
+ brelse(bh);
+ }
+
+ /* log error, force error return */
+ if (primary_failed) {
+ btrfs_err(device->fs_info, "error writing primary super block to device %llu",
+ device->devid);
+ return -1;
+ }
+
+ return errors < i ? 0 : -1;
+}
+
+/*
+ * endio for the write_dev_flush, this will wake anyone waiting
+ * for the barrier when it is done
+ */
+static void btrfs_end_empty_barrier(struct bio *bio)
+{
+ complete(bio->bi_private);
+}
+
+/*
+ * Submit a flush request to the device if it supports it. Error handling is
+ * done in the waiting counterpart.
+ */
+static void write_dev_flush(struct btrfs_device *device)
+{
+ struct request_queue *q = bdev_get_queue(device->bdev);
+ struct bio *bio = device->flush_bio;
+
+ if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
+ return;
+
+ bio_reset(bio);
+ bio->bi_end_io = btrfs_end_empty_barrier;
+ bio_set_dev(bio, device->bdev);
+ bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;
+ init_completion(&device->flush_wait);
+ bio->bi_private = &device->flush_wait;
+
+ btrfsic_submit_bio(bio);
+ set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
+}
+
+/*
+ * If the flush bio has been submitted by write_dev_flush, wait for it.
+ */
+static blk_status_t wait_dev_flush(struct btrfs_device *device)
+{
+ struct bio *bio = device->flush_bio;
+
+ if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
+ return BLK_STS_OK;
+
+ clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
+ wait_for_completion_io(&device->flush_wait);
+
+ return bio->bi_status;
+}
+
+static int check_barrier_error(struct btrfs_fs_info *fs_info)
+{
+ if (!btrfs_check_rw_degradable(fs_info, NULL))
+ return -EIO;
+ return 0;
+}
+
+/*
+ * send an empty flush down to each device in parallel,
+ * then wait for them
+ */
+static int barrier_all_devices(struct btrfs_fs_info *info)
+{
+ struct list_head *head;
+ struct btrfs_device *dev;
+ int errors_wait = 0;
+ blk_status_t ret;
+
+ lockdep_assert_held(&info->fs_devices->device_list_mutex);
+ /* send down all the barriers */
+ head = &info->fs_devices->devices;
+ list_for_each_entry(dev, head, dev_list) {
+ if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
+ continue;
+ if (!dev->bdev)
+ continue;
+ if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
+ !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
+ continue;
+
+ write_dev_flush(dev);
+ dev->last_flush_error = BLK_STS_OK;
+ }
+
+ /* wait for all the barriers */
+ list_for_each_entry(dev, head, dev_list) {
+ if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
+ continue;
+ if (!dev->bdev) {
+ errors_wait++;
+ continue;
+ }
+ if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
+ !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
+ continue;
+
+ ret = wait_dev_flush(dev);
+ if (ret) {
+ dev->last_flush_error = ret;
+ btrfs_dev_stat_inc_and_print(dev,
+ BTRFS_DEV_STAT_FLUSH_ERRS);
+ errors_wait++;
+ }
+ }
+
+ if (errors_wait) {
+ /*
+ * At some point we need the status of all disks
+ * to arrive at the volume status. So error checking
+ * is being pushed to a separate loop.
+ */
+ return check_barrier_error(info);
+ }
+ return 0;
+}
+
+int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
+{
+ int raid_type;
+ int min_tolerated = INT_MAX;
+
+ if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
+ (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
+ min_tolerated = min(min_tolerated,
+ btrfs_raid_array[BTRFS_RAID_SINGLE].
+ tolerated_failures);
+
+ for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
+ if (raid_type == BTRFS_RAID_SINGLE)
+ continue;
+ if (!(flags & btrfs_raid_array[raid_type].bg_flag))
+ continue;
+ min_tolerated = min(min_tolerated,
+ btrfs_raid_array[raid_type].
+ tolerated_failures);
+ }
+
+ if (min_tolerated == INT_MAX) {
+ pr_warn("BTRFS: unknown raid flag: %llu", flags);
+ min_tolerated = 0;
+ }
+
+ return min_tolerated;
+}
+
+int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
+{
+ struct list_head *head;
+ struct btrfs_device *dev;
+ struct btrfs_super_block *sb;
+ struct btrfs_dev_item *dev_item;
+ int ret;
+ int do_barriers;
+ int max_errors;
+ int total_errors = 0;
+ u64 flags;
+
+ do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
+
+ /*
+ * max_mirrors == 0 indicates we're from commit_transaction,
+ * not from fsync where the tree roots in fs_info have not
+ * been consistent on disk.
+ */
+ if (max_mirrors == 0)
+ backup_super_roots(fs_info);
+
+ sb = fs_info->super_for_commit;
+ dev_item = &sb->dev_item;
+
+ mutex_lock(&fs_info->fs_devices->device_list_mutex);
+ head = &fs_info->fs_devices->devices;
+ max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
+
+ if (do_barriers) {
+ ret = barrier_all_devices(fs_info);
+ if (ret) {
+ mutex_unlock(
+ &fs_info->fs_devices->device_list_mutex);
+ btrfs_handle_fs_error(fs_info, ret,
+ "errors while submitting device barriers.");
+ return ret;
+ }
+ }
+
+ list_for_each_entry(dev, head, dev_list) {
+ if (!dev->bdev) {
+ total_errors++;
+ continue;
+ }
+ if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
+ !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
+ continue;
+
+ btrfs_set_stack_device_generation(dev_item, 0);
+ btrfs_set_stack_device_type(dev_item, dev->type);
+ btrfs_set_stack_device_id(dev_item, dev->devid);
+ btrfs_set_stack_device_total_bytes(dev_item,
+ dev->commit_total_bytes);
+ btrfs_set_stack_device_bytes_used(dev_item,
+ dev->commit_bytes_used);
+ btrfs_set_stack_device_io_align(dev_item, dev->io_align);
+ btrfs_set_stack_device_io_width(dev_item, dev->io_width);
+ btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
+ memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
+ memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_FSID_SIZE);
+
+ flags = btrfs_super_flags(sb);
+ btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
+
+ ret = btrfs_validate_write_super(fs_info, sb);
+ if (ret < 0) {
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ btrfs_handle_fs_error(fs_info, -EUCLEAN,
+ "unexpected superblock corruption detected");
+ return -EUCLEAN;
+ }
+
+ ret = write_dev_supers(dev, sb, max_mirrors);
+ if (ret)
+ total_errors++;
+ }
+ if (total_errors > max_errors) {
+ btrfs_err(fs_info, "%d errors while writing supers",
+ total_errors);
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+
+ /* FUA is masked off if unsupported and can't be the reason */
+ btrfs_handle_fs_error(fs_info, -EIO,
+ "%d errors while writing supers",
+ total_errors);
+ return -EIO;
+ }
+
+ total_errors = 0;
+ list_for_each_entry(dev, head, dev_list) {
+ if (!dev->bdev)
+ continue;
+ if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
+ !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
+ continue;
+
+ ret = wait_dev_supers(dev, max_mirrors);
+ if (ret)
+ total_errors++;
+ }
+ mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+ if (total_errors > max_errors) {
+ btrfs_handle_fs_error(fs_info, -EIO,
+ "%d errors while writing supers",
+ total_errors);
+ return -EIO;
+ }
+ return 0;
+}
+
+/* Drop a fs root from the radix tree and free it. */
+void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *root)
+{
+ spin_lock(&fs_info->fs_roots_radix_lock);
+ radix_tree_delete(&fs_info->fs_roots_radix,
+ (unsigned long)root->root_key.objectid);
+ spin_unlock(&fs_info->fs_roots_radix_lock);
+
+ if (btrfs_root_refs(&root->root_item) == 0)
+ synchronize_srcu(&fs_info->subvol_srcu);
+
+ if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
+ btrfs_free_log(NULL, root);
+ if (root->reloc_root) {
+ free_extent_buffer(root->reloc_root->node);
+ free_extent_buffer(root->reloc_root->commit_root);
+ btrfs_put_fs_root(root->reloc_root);
+ root->reloc_root = NULL;
+ }
+ }
+
+ if (root->free_ino_pinned)
+ __btrfs_remove_free_space_cache(root->free_ino_pinned);
+ if (root->free_ino_ctl)
+ __btrfs_remove_free_space_cache(root->free_ino_ctl);
+ btrfs_free_fs_root(root);
+}
+
+void btrfs_free_fs_root(struct btrfs_root *root)
+{
+ iput(root->ino_cache_inode);
+ WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
+ if (root->anon_dev)
+ free_anon_bdev(root->anon_dev);
+ if (root->subv_writers)
+ btrfs_free_subvolume_writers(root->subv_writers);
+ free_extent_buffer(root->node);
+ free_extent_buffer(root->commit_root);
+ kfree(root->free_ino_ctl);
+ kfree(root->free_ino_pinned);
+ btrfs_put_fs_root(root);
+}
+
+int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
+{
+ u64 root_objectid = 0;
+ struct btrfs_root *gang[8];
+ int i = 0;
+ int err = 0;
+ unsigned int ret = 0;
+ int index;
+
+ while (1) {
+ index = srcu_read_lock(&fs_info->subvol_srcu);
+ ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
+ (void **)gang, root_objectid,
+ ARRAY_SIZE(gang));
+ if (!ret) {
+ srcu_read_unlock(&fs_info->subvol_srcu, index);
+ break;
+ }
+ root_objectid = gang[ret - 1]->root_key.objectid + 1;
+
+ for (i = 0; i < ret; i++) {
+ /* Avoid to grab roots in dead_roots */
+ if (btrfs_root_refs(&gang[i]->root_item) == 0) {
+ gang[i] = NULL;
+ continue;
+ }
+ /* grab all the search result for later use */
+ gang[i] = btrfs_grab_fs_root(gang[i]);
+ }
+ srcu_read_unlock(&fs_info->subvol_srcu, index);
+
+ for (i = 0; i < ret; i++) {
+ if (!gang[i])
+ continue;
+ root_objectid = gang[i]->root_key.objectid;
+ err = btrfs_orphan_cleanup(gang[i]);
+ if (err)
+ break;
+ btrfs_put_fs_root(gang[i]);
+ }
+ root_objectid++;
+ }
+
+ /* release the uncleaned roots due to error */
+ for (; i < ret; i++) {
+ if (gang[i])
+ btrfs_put_fs_root(gang[i]);
+ }
+ return err;
+}
+
+int btrfs_commit_super(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *root = fs_info->tree_root;
+ struct btrfs_trans_handle *trans;
+
+ mutex_lock(&fs_info->cleaner_mutex);
+ btrfs_run_delayed_iputs(fs_info);
+ mutex_unlock(&fs_info->cleaner_mutex);
+ wake_up_process(fs_info->cleaner_kthread);
+
+ /* wait until ongoing cleanup work done */
+ down_write(&fs_info->cleanup_work_sem);
+ up_write(&fs_info->cleanup_work_sem);
+
+ trans = btrfs_join_transaction(root);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
+ return btrfs_commit_transaction(trans);
+}
+
+void close_ctree(struct btrfs_fs_info *fs_info)
+{
+ int ret;
+
+ set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
+ /*
+ * We don't want the cleaner to start new transactions, add more delayed
+ * iputs, etc. while we're closing. We can't use kthread_stop() yet
+ * because that frees the task_struct, and the transaction kthread might
+ * still try to wake up the cleaner.
+ */
+ kthread_park(fs_info->cleaner_kthread);
+
+ /* wait for the qgroup rescan worker to stop */
+ btrfs_qgroup_wait_for_completion(fs_info, false);
+
+ /* wait for the uuid_scan task to finish */
+ down(&fs_info->uuid_tree_rescan_sem);
+ /* avoid complains from lockdep et al., set sem back to initial state */
+ up(&fs_info->uuid_tree_rescan_sem);
+
+ /* pause restriper - we want to resume on mount */
+ btrfs_pause_balance(fs_info);
+
+ btrfs_dev_replace_suspend_for_unmount(fs_info);
+
+ btrfs_scrub_cancel(fs_info);
+
+ /* wait for any defraggers to finish */
+ wait_event(fs_info->transaction_wait,
+ (atomic_read(&fs_info->defrag_running) == 0));
+
+ /* clear out the rbtree of defraggable inodes */
+ btrfs_cleanup_defrag_inodes(fs_info);
+
+ cancel_work_sync(&fs_info->async_reclaim_work);
+
+ if (!sb_rdonly(fs_info->sb)) {
+ /*
+ * The cleaner kthread is stopped, so do one final pass over
+ * unused block groups.
+ */
+ btrfs_delete_unused_bgs(fs_info);
+
+ ret = btrfs_commit_super(fs_info);
+ if (ret)
+ btrfs_err(fs_info, "commit super ret %d", ret);
+ }
+
+ if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state) ||
+ test_bit(BTRFS_FS_STATE_TRANS_ABORTED, &fs_info->fs_state))
+ btrfs_error_commit_super(fs_info);
+
+ kthread_stop(fs_info->transaction_kthread);
+ kthread_stop(fs_info->cleaner_kthread);
+
+ set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
+
+ btrfs_free_qgroup_config(fs_info);
+ ASSERT(list_empty(&fs_info->delalloc_roots));
+
+ if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
+ btrfs_info(fs_info, "at unmount delalloc count %lld",
+ percpu_counter_sum(&fs_info->delalloc_bytes));
+ }
+
+ btrfs_sysfs_remove_mounted(fs_info);
+ btrfs_sysfs_remove_fsid(fs_info->fs_devices);
+
+ btrfs_free_fs_roots(fs_info);
+
+ btrfs_put_block_group_cache(fs_info);
+
+ /*
+ * we must make sure there is not any read request to
+ * submit after we stopping all workers.
+ */
+ invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
+ btrfs_stop_all_workers(fs_info);
+
+ btrfs_free_block_groups(fs_info);
+
+ clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
+ free_root_pointers(fs_info, 1);
+
+ iput(fs_info->btree_inode);
+
+#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
+ if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
+ btrfsic_unmount(fs_info->fs_devices);
+#endif
+
+ btrfs_close_devices(fs_info->fs_devices);
+ btrfs_mapping_tree_free(&fs_info->mapping_tree);
+
+ percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
+ percpu_counter_destroy(&fs_info->delalloc_bytes);
+ percpu_counter_destroy(&fs_info->bio_counter);
+ cleanup_srcu_struct(&fs_info->subvol_srcu);
+
+ btrfs_free_stripe_hash_table(fs_info);
+ btrfs_free_ref_cache(fs_info);
+
+ while (!list_empty(&fs_info->pinned_chunks)) {
+ struct extent_map *em;
+
+ em = list_first_entry(&fs_info->pinned_chunks,
+ struct extent_map, list);
+ list_del_init(&em->list);
+ free_extent_map(em);
+ }
+}
+
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
+ int atomic)
+{
+ int ret;
+ struct inode *btree_inode = buf->pages[0]->mapping->host;
+
+ ret = extent_buffer_uptodate(buf);
+ if (!ret)
+ return ret;
+
+ ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
+ parent_transid, atomic);
+ if (ret == -EAGAIN)
+ return ret;
+ return !ret;
+}
+
+void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
+{
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_root *root;
+ u64 transid = btrfs_header_generation(buf);
+ int was_dirty;
+
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+ /*
+ * This is a fast path so only do this check if we have sanity tests
+ * enabled. Normal people shouldn't be using umapped buffers as dirty
+ * outside of the sanity tests.
+ */
+ if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
+ return;
+#endif
+ root = BTRFS_I(buf->pages[0]->mapping->host)->root;
+ fs_info = root->fs_info;
+ btrfs_assert_tree_locked(buf);
+ if (transid != fs_info->generation)
+ WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
+ buf->start, transid, fs_info->generation);
+ was_dirty = set_extent_buffer_dirty(buf);
+ if (!was_dirty)
+ percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
+ buf->len,
+ fs_info->dirty_metadata_batch);
+#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
+ /*
+ * Since btrfs_mark_buffer_dirty() can be called with item pointer set
+ * but item data not updated.
+ * So here we should only check item pointers, not item data.
+ */
+ if (btrfs_header_level(buf) == 0 &&
+ btrfs_check_leaf_relaxed(fs_info, buf)) {
+ btrfs_print_leaf(buf);
+ ASSERT(0);
+ }
+#endif
+}
+
+static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
+ int flush_delayed)
+{
+ /*
+ * looks as though older kernels can get into trouble with
+ * this code, they end up stuck in balance_dirty_pages forever
+ */
+ int ret;
+
+ if (current->flags & PF_MEMALLOC)
+ return;
+
+ if (flush_delayed)
+ btrfs_balance_delayed_items(fs_info);
+
+ ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
+ BTRFS_DIRTY_METADATA_THRESH,
+ fs_info->dirty_metadata_batch);
+ if (ret > 0) {
+ balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
+ }
+}
+
+void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
+{
+ __btrfs_btree_balance_dirty(fs_info, 1);
+}
+
+void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
+{
+ __btrfs_btree_balance_dirty(fs_info, 0);
+}
+
+int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
+ struct btrfs_key *first_key)
+{
+ struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+
+ return btree_read_extent_buffer_pages(fs_info, buf, parent_transid,
+ level, first_key);
+}
+
+static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
+{
+ /* cleanup FS via transaction */
+ btrfs_cleanup_transaction(fs_info);
+
+ mutex_lock(&fs_info->cleaner_mutex);
+ btrfs_run_delayed_iputs(fs_info);
+ mutex_unlock(&fs_info->cleaner_mutex);
+
+ down_write(&fs_info->cleanup_work_sem);
+ up_write(&fs_info->cleanup_work_sem);
+}
+
+static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
+{
+ struct btrfs_ordered_extent *ordered;
+
+ spin_lock(&root->ordered_extent_lock);
+ /*
+ * This will just short circuit the ordered completion stuff which will
+ * make sure the ordered extent gets properly cleaned up.
+ */
+ list_for_each_entry(ordered, &root->ordered_extents,
+ root_extent_list)
+ set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
+ spin_unlock(&root->ordered_extent_lock);
+}
+
+static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *root;
+ struct list_head splice;
+
+ INIT_LIST_HEAD(&splice);
+
+ spin_lock(&fs_info->ordered_root_lock);
+ list_splice_init(&fs_info->ordered_roots, &splice);
+ while (!list_empty(&splice)) {
+ root = list_first_entry(&splice, struct btrfs_root,
+ ordered_root);
+ list_move_tail(&root->ordered_root,
+ &fs_info->ordered_roots);
+
+ spin_unlock(&fs_info->ordered_root_lock);
+ btrfs_destroy_ordered_extents(root);
+
+ cond_resched();
+ spin_lock(&fs_info->ordered_root_lock);
+ }
+ spin_unlock(&fs_info->ordered_root_lock);
+}
+
+static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
+ struct btrfs_fs_info *fs_info)
+{
+ struct rb_node *node;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ int ret = 0;
+
+ delayed_refs = &trans->delayed_refs;
+
+ spin_lock(&delayed_refs->lock);
+ if (atomic_read(&delayed_refs->num_entries) == 0) {
+ spin_unlock(&delayed_refs->lock);
+ btrfs_info(fs_info, "delayed_refs has NO entry");
+ return ret;
+ }
+
+ while ((node = rb_first(&delayed_refs->href_root)) != NULL) {
+ struct btrfs_delayed_ref_head *head;
+ struct rb_node *n;
+ bool pin_bytes = false;
+
+ head = rb_entry(node, struct btrfs_delayed_ref_head,
+ href_node);
+ if (!mutex_trylock(&head->mutex)) {
+ refcount_inc(&head->refs);
+ spin_unlock(&delayed_refs->lock);
+
+ mutex_lock(&head->mutex);
+ mutex_unlock(&head->mutex);
+ btrfs_put_delayed_ref_head(head);
+ spin_lock(&delayed_refs->lock);
+ continue;
+ }
+ spin_lock(&head->lock);
+ while ((n = rb_first(&head->ref_tree)) != NULL) {
+ ref = rb_entry(n, struct btrfs_delayed_ref_node,
+ ref_node);
+ ref->in_tree = 0;
+ rb_erase(&ref->ref_node, &head->ref_tree);
+ RB_CLEAR_NODE(&ref->ref_node);
+ if (!list_empty(&ref->add_list))
+ list_del(&ref->add_list);
+ atomic_dec(&delayed_refs->num_entries);
+ btrfs_put_delayed_ref(ref);
+ }
+ if (head->must_insert_reserved)
+ pin_bytes = true;
+ btrfs_free_delayed_extent_op(head->extent_op);
+ delayed_refs->num_heads--;
+ if (head->processing == 0)
+ delayed_refs->num_heads_ready--;
+ atomic_dec(&delayed_refs->num_entries);
+ rb_erase(&head->href_node, &delayed_refs->href_root);
+ RB_CLEAR_NODE(&head->href_node);
+ spin_unlock(&head->lock);
+ spin_unlock(&delayed_refs->lock);
+ mutex_unlock(&head->mutex);
+
+ if (pin_bytes)
+ btrfs_pin_extent(fs_info, head->bytenr,
+ head->num_bytes, 1);
+ btrfs_put_delayed_ref_head(head);
+ cond_resched();
+ spin_lock(&delayed_refs->lock);
+ }
+
+ spin_unlock(&delayed_refs->lock);
+
+ return ret;
+}
+
+static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
+{
+ struct btrfs_inode *btrfs_inode;
+ struct list_head splice;
+
+ INIT_LIST_HEAD(&splice);
+
+ spin_lock(&root->delalloc_lock);
+ list_splice_init(&root->delalloc_inodes, &splice);
+
+ while (!list_empty(&splice)) {
+ struct inode *inode = NULL;
+ btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
+ delalloc_inodes);
+ __btrfs_del_delalloc_inode(root, btrfs_inode);
+ spin_unlock(&root->delalloc_lock);
+
+ /*
+ * Make sure we get a live inode and that it'll not disappear
+ * meanwhile.
+ */
+ inode = igrab(&btrfs_inode->vfs_inode);
+ if (inode) {
+ invalidate_inode_pages2(inode->i_mapping);
+ iput(inode);
+ }
+ spin_lock(&root->delalloc_lock);
+ }
+ spin_unlock(&root->delalloc_lock);
+}
+
+static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *root;
+ struct list_head splice;
+
+ INIT_LIST_HEAD(&splice);
+
+ spin_lock(&fs_info->delalloc_root_lock);
+ list_splice_init(&fs_info->delalloc_roots, &splice);
+ while (!list_empty(&splice)) {
+ root = list_first_entry(&splice, struct btrfs_root,
+ delalloc_root);
+ root = btrfs_grab_fs_root(root);
+ BUG_ON(!root);
+ spin_unlock(&fs_info->delalloc_root_lock);
+
+ btrfs_destroy_delalloc_inodes(root);
+ btrfs_put_fs_root(root);
+
+ spin_lock(&fs_info->delalloc_root_lock);
+ }
+ spin_unlock(&fs_info->delalloc_root_lock);
+}
+
+static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
+ struct extent_io_tree *dirty_pages,
+ int mark)
+{
+ int ret;
+ struct extent_buffer *eb;
+ u64 start = 0;
+ u64 end;
+
+ while (1) {
+ ret = find_first_extent_bit(dirty_pages, start, &start, &end,
+ mark, NULL);
+ if (ret)
+ break;
+
+ clear_extent_bits(dirty_pages, start, end, mark);
+ while (start <= end) {
+ eb = find_extent_buffer(fs_info, start);
+ start += fs_info->nodesize;
+ if (!eb)
+ continue;
+ wait_on_extent_buffer_writeback(eb);
+
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
+ &eb->bflags))
+ clear_extent_buffer_dirty(eb);
+ free_extent_buffer_stale(eb);
+ }
+ }
+
+ return ret;
+}
+
+static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
+ struct extent_io_tree *pinned_extents)
+{
+ struct extent_io_tree *unpin;
+ u64 start;
+ u64 end;
+ int ret;
+ bool loop = true;
+
+ unpin = pinned_extents;
+again:
+ while (1) {
+ /*
+ * The btrfs_finish_extent_commit() may get the same range as
+ * ours between find_first_extent_bit and clear_extent_dirty.
+ * Hence, hold the unused_bg_unpin_mutex to avoid double unpin
+ * the same extent range.
+ */
+ mutex_lock(&fs_info->unused_bg_unpin_mutex);
+ ret = find_first_extent_bit(unpin, 0, &start, &end,
+ EXTENT_DIRTY, NULL);
+ if (ret) {
+ mutex_unlock(&fs_info->unused_bg_unpin_mutex);
+ break;
+ }
+
+ clear_extent_dirty(unpin, start, end);
+ btrfs_error_unpin_extent_range(fs_info, start, end);
+ mutex_unlock(&fs_info->unused_bg_unpin_mutex);
+ cond_resched();
+ }
+
+ if (loop) {
+ if (unpin == &fs_info->freed_extents[0])
+ unpin = &fs_info->freed_extents[1];
+ else
+ unpin = &fs_info->freed_extents[0];
+ loop = false;
+ goto again;
+ }
+
+ return 0;
+}
+
+static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *cache)
+{
+ struct inode *inode;
+
+ inode = cache->io_ctl.inode;
+ if (inode) {
+ invalidate_inode_pages2(inode->i_mapping);
+ BTRFS_I(inode)->generation = 0;
+ cache->io_ctl.inode = NULL;
+ iput(inode);
+ }
+ btrfs_put_block_group(cache);
+}
+
+void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
+ struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_block_group_cache *cache;
+
+ spin_lock(&cur_trans->dirty_bgs_lock);
+ while (!list_empty(&cur_trans->dirty_bgs)) {
+ cache = list_first_entry(&cur_trans->dirty_bgs,
+ struct btrfs_block_group_cache,
+ dirty_list);
+
+ if (!list_empty(&cache->io_list)) {
+ spin_unlock(&cur_trans->dirty_bgs_lock);
+ list_del_init(&cache->io_list);
+ btrfs_cleanup_bg_io(cache);
+ spin_lock(&cur_trans->dirty_bgs_lock);
+ }
+
+ list_del_init(&cache->dirty_list);
+ spin_lock(&cache->lock);
+ cache->disk_cache_state = BTRFS_DC_ERROR;
+ spin_unlock(&cache->lock);
+
+ spin_unlock(&cur_trans->dirty_bgs_lock);
+ btrfs_put_block_group(cache);
+ spin_lock(&cur_trans->dirty_bgs_lock);
+ }
+ spin_unlock(&cur_trans->dirty_bgs_lock);
+
+ /*
+ * Refer to the definition of io_bgs member for details why it's safe
+ * to use it without any locking
+ */
+ while (!list_empty(&cur_trans->io_bgs)) {
+ cache = list_first_entry(&cur_trans->io_bgs,
+ struct btrfs_block_group_cache,
+ io_list);
+
+ list_del_init(&cache->io_list);
+ spin_lock(&cache->lock);
+ cache->disk_cache_state = BTRFS_DC_ERROR;
+ spin_unlock(&cache->lock);
+ btrfs_cleanup_bg_io(cache);
+ }
+}
+
+void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
+ struct btrfs_fs_info *fs_info)
+{
+ btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
+ ASSERT(list_empty(&cur_trans->dirty_bgs));
+ ASSERT(list_empty(&cur_trans->io_bgs));
+
+ btrfs_destroy_delayed_refs(cur_trans, fs_info);
+
+ cur_trans->state = TRANS_STATE_COMMIT_START;
+ wake_up(&fs_info->transaction_blocked_wait);
+
+ cur_trans->state = TRANS_STATE_UNBLOCKED;
+ wake_up(&fs_info->transaction_wait);
+
+ btrfs_destroy_delayed_inodes(fs_info);
+ btrfs_assert_delayed_root_empty(fs_info);
+
+ btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
+ EXTENT_DIRTY);
+ btrfs_destroy_pinned_extent(fs_info,
+ fs_info->pinned_extents);
+
+ cur_trans->state =TRANS_STATE_COMPLETED;
+ wake_up(&cur_trans->commit_wait);
+}
+
+static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_transaction *t;
+
+ mutex_lock(&fs_info->transaction_kthread_mutex);
+
+ spin_lock(&fs_info->trans_lock);
+ while (!list_empty(&fs_info->trans_list)) {
+ t = list_first_entry(&fs_info->trans_list,
+ struct btrfs_transaction, list);
+ if (t->state >= TRANS_STATE_COMMIT_START) {
+ refcount_inc(&t->use_count);
+ spin_unlock(&fs_info->trans_lock);
+ btrfs_wait_for_commit(fs_info, t->transid);
+ btrfs_put_transaction(t);
+ spin_lock(&fs_info->trans_lock);
+ continue;
+ }
+ if (t == fs_info->running_transaction) {
+ t->state = TRANS_STATE_COMMIT_DOING;
+ spin_unlock(&fs_info->trans_lock);
+ /*
+ * We wait for 0 num_writers since we don't hold a trans
+ * handle open currently for this transaction.
+ */
+ wait_event(t->writer_wait,
+ atomic_read(&t->num_writers) == 0);
+ } else {
+ spin_unlock(&fs_info->trans_lock);
+ }
+ btrfs_cleanup_one_transaction(t, fs_info);
+
+ spin_lock(&fs_info->trans_lock);
+ if (t == fs_info->running_transaction)
+ fs_info->running_transaction = NULL;
+ list_del_init(&t->list);
+ spin_unlock(&fs_info->trans_lock);
+
+ btrfs_put_transaction(t);
+ trace_btrfs_transaction_commit(fs_info->tree_root);
+ spin_lock(&fs_info->trans_lock);
+ }
+ spin_unlock(&fs_info->trans_lock);
+ btrfs_destroy_all_ordered_extents(fs_info);
+ btrfs_destroy_delayed_inodes(fs_info);
+ btrfs_assert_delayed_root_empty(fs_info);
+ btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
+ btrfs_destroy_all_delalloc_inodes(fs_info);
+ mutex_unlock(&fs_info->transaction_kthread_mutex);
+
+ return 0;
+}
+
+static const struct extent_io_ops btree_extent_io_ops = {
+ /* mandatory callbacks */
+ .submit_bio_hook = btree_submit_bio_hook,
+ .readpage_end_io_hook = btree_readpage_end_io_hook,
+ .readpage_io_failed_hook = btree_io_failed_hook,
+
+ /* optional callbacks */
+};