btrfs: root->fs_info cleanup, use fs_info->dev_root everywhere

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

6 files changed, 68 insertions, 70 deletions

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 270da67de53d..91f6bd9124d9 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -832,7 +832,7 @@ static int btrfsic_process_superblock_dev_mirror(
                 superblock_tmp->never_written = 0;
                 superblock_tmp->mirror_num = 1 + superblock_mirror_num;
                 if (state->print_mask & BTRFSIC_PRINT_MASK_SUPERBLOCK_WRITE)
-                        btrfs_info_in_rcu(device->dev_root->fs_info,
+                        btrfs_info_in_rcu(device->fs_info,
                                 "new initial S-block (bdev %p, %s) @%llu (%s/%llu/%d)",
                                      superblock_bdev,
                                      rcu_str_deref(device->name), dev_bytenr,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1db5f0304c6b..83848314e12f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3308,7 +3308,7 @@ static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
                 struct btrfs_device *device = (struct btrfs_device *)
                         bh->b_private;
 
-                btrfs_warn_rl_in_rcu(device->dev_root->fs_info,
+                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
@@ -3453,7 +3453,7 @@ static int write_dev_supers(struct btrfs_device *device,
                         bh = __getblk(device->bdev, bytenr / 4096,
                                       BTRFS_SUPER_INFO_SIZE);
                         if (!bh) {
-                                btrfs_err(device->dev_root->fs_info,
+                                btrfs_err(device->fs_info,
                                     "couldn't get super buffer head for bytenr %llu",
                                     bytenr);
                                 errors++;
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e8b8e309e4ab..9e8342367056 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -10853,7 +10853,7 @@ static int btrfs_trim_free_extents(struct btrfs_device *device,
         ret = 0;
 
         while (1) {
-                struct btrfs_fs_info *fs_info = device->dev_root->fs_info;
+                struct btrfs_fs_info *fs_info = device->fs_info;
                 struct btrfs_transaction *trans;
                 u64 bytes;
 
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 589d79219c18..ed7024687ae0 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -171,7 +171,7 @@ struct scrub_wr_ctx {
 
 struct scrub_ctx {
         struct scrub_bio        *bios[SCRUB_BIOS_PER_SCTX];
-        struct btrfs_root       *dev_root;
+        struct btrfs_fs_info    *fs_info;
         int                     first_free;
         int                     curr;
         atomic_t                bios_in_flight;
@@ -356,7 +356,7 @@ static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
  */
 static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
 {
-        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
 
         atomic_inc(&sctx->refs);
         /*
@@ -388,7 +388,7 @@ static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
 /* used for workers that require transaction commits */
 static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
 {
-        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
 
         /*
          * see scrub_pending_trans_workers_inc() why we're pretending
@@ -458,7 +458,7 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
 {
         struct scrub_ctx *sctx;
         int             i;
-        struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = dev->fs_info;
         int ret;
 
         sctx = kzalloc(sizeof(*sctx), GFP_KERNEL);
@@ -468,7 +468,7 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
         sctx->is_dev_replace = is_dev_replace;
         sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
         sctx->curr = -1;
-        sctx->dev_root = dev->dev_root;
+        sctx->fs_info = dev->fs_info;
         for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
                 struct scrub_bio *sbio;
 
@@ -489,8 +489,8 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
                         sctx->bios[i]->next_free = -1;
         }
         sctx->first_free = 0;
-        sctx->nodesize = dev->dev_root->nodesize;
-        sctx->sectorsize = dev->dev_root->sectorsize;
+        sctx->nodesize = dev->fs_info->dev_root->nodesize;
+        sctx->sectorsize = dev->fs_info->dev_root->sectorsize;
         atomic_set(&sctx->bios_in_flight, 0);
         atomic_set(&sctx->workers_pending, 0);
         atomic_set(&sctx->cancel_req, 0);
@@ -524,7 +524,7 @@ static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
         struct extent_buffer *eb;
         struct btrfs_inode_item *inode_item;
         struct scrub_warning *swarn = warn_ctx;
-        struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = swarn->dev->fs_info;
         struct inode_fs_paths *ipath = NULL;
         struct btrfs_root *local_root;
         struct btrfs_key root_key;
@@ -618,7 +618,7 @@ static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
 
         WARN_ON(sblock->page_count < 1);
         dev = sblock->pagev[0]->dev;
-        fs_info = sblock->sctx->dev_root->fs_info;
+        fs_info = sblock->sctx->fs_info;
 
         path = btrfs_alloc_path();
         if (!path)
@@ -843,10 +843,9 @@ out:
                 spin_lock(&sctx->stat_lock);
                 ++sctx->stat.uncorrectable_errors;
                 spin_unlock(&sctx->stat_lock);
-                btrfs_dev_replace_stats_inc(
-                        &sctx->dev_root->fs_info->dev_replace.
-                        num_uncorrectable_read_errors);
-                btrfs_err_rl_in_rcu(sctx->dev_root->fs_info,
+                btrfs_dev_replace_stats_inc(&sctx->fs_info->dev_replace.
+                                                num_uncorrectable_read_errors);
+                btrfs_err_rl_in_rcu(sctx->fs_info,
                     "unable to fixup (nodatasum) error at logical %llu on dev %s",
                         fixup->logical, rcu_str_deref(fixup->dev->name));
         }
@@ -898,7 +897,7 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
                                       DEFAULT_RATELIMIT_BURST);
 
         BUG_ON(sblock_to_check->page_count < 1);
-        fs_info = sctx->dev_root->fs_info;
+        fs_info = sctx->fs_info;
         if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
                 /*
                  * if we find an error in a super block, we just report it.
@@ -1177,8 +1176,7 @@ nodatasum_case:
                         if (scrub_write_page_to_dev_replace(sblock_other,
                                                             page_num) != 0) {
                                 btrfs_dev_replace_stats_inc(
-                                        &sctx->dev_root->
-                                        fs_info->dev_replace.
+                                        &sctx->fs_info->dev_replace.
                                         num_write_errors);
                                 success = 0;
                         }
@@ -1302,7 +1300,7 @@ static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
                                      struct scrub_block *sblocks_for_recheck)
 {
         struct scrub_ctx *sctx = original_sblock->sctx;
-        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
         u64 length = original_sblock->page_count * PAGE_SIZE;
         u64 logical = original_sblock->pagev[0]->logical;
         u64 generation = original_sblock->pagev[0]->generation;
@@ -1574,7 +1572,7 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
                 int ret;
 
                 if (!page_bad->dev->bdev) {
-                        btrfs_warn_rl(sblock_bad->sctx->dev_root->fs_info,
+                        btrfs_warn_rl(sblock_bad->sctx->fs_info,
                                 "scrub_repair_page_from_good_copy(bdev == NULL) is unexpected");
                         return -EIO;
                 }
@@ -1596,7 +1594,7 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
                         btrfs_dev_stat_inc_and_print(page_bad->dev,
                                 BTRFS_DEV_STAT_WRITE_ERRS);
                         btrfs_dev_replace_stats_inc(
-                                &sblock_bad->sctx->dev_root->fs_info->
+                                &sblock_bad->sctx->fs_info->
                                 dev_replace.num_write_errors);
                         bio_put(bio);
                         return -EIO;
@@ -1624,7 +1622,7 @@ static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
                 ret = scrub_write_page_to_dev_replace(sblock, page_num);
                 if (ret)
                         btrfs_dev_replace_stats_inc(
-                                &sblock->sctx->dev_root->fs_info->dev_replace.
+                                &sblock->sctx->fs_info->dev_replace.
                                 num_write_errors);
         }
 }
@@ -1740,7 +1738,7 @@ static void scrub_wr_submit(struct scrub_ctx *sctx)
 static void scrub_wr_bio_end_io(struct bio *bio)
 {
         struct scrub_bio *sbio = bio->bi_private;
-        struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sbio->dev->fs_info;
 
         sbio->err = bio->bi_error;
         sbio->bio = bio;
@@ -1759,7 +1757,7 @@ static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
         WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
         if (sbio->err) {
                 struct btrfs_dev_replace *dev_replace =
-                        &sbio->sctx->dev_root->fs_info->dev_replace;
+                        &sbio->sctx->fs_info->dev_replace;
 
                 for (i = 0; i < sbio->page_count; i++) {
                         struct scrub_page *spage = sbio->pagev[i];
@@ -1859,7 +1857,7 @@ static int scrub_checksum_tree_block(struct scrub_block *sblock)
 {
         struct scrub_ctx *sctx = sblock->sctx;
         struct btrfs_header *h;
-        struct btrfs_root *root = sctx->dev_root;
+        struct btrfs_root *root = sctx->fs_info->dev_root;
         struct btrfs_fs_info *fs_info = root->fs_info;
         u8 calculated_csum[BTRFS_CSUM_SIZE];
         u8 on_disk_csum[BTRFS_CSUM_SIZE];
@@ -2126,7 +2124,7 @@ again:
 static void scrub_missing_raid56_end_io(struct bio *bio)
 {
         struct scrub_block *sblock = bio->bi_private;
-        struct btrfs_fs_info *fs_info = sblock->sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sblock->sctx->fs_info;
 
         if (bio->bi_error)
                 sblock->no_io_error_seen = 0;
@@ -2153,14 +2151,14 @@ static void scrub_missing_raid56_worker(struct btrfs_work *work)
                 spin_lock(&sctx->stat_lock);
                 sctx->stat.read_errors++;
                 spin_unlock(&sctx->stat_lock);
-                btrfs_err_rl_in_rcu(sctx->dev_root->fs_info,
+                btrfs_err_rl_in_rcu(sctx->fs_info,
                         "IO error rebuilding logical %llu for dev %s",
                         logical, rcu_str_deref(dev->name));
         } else if (sblock->header_error || sblock->checksum_error) {
                 spin_lock(&sctx->stat_lock);
                 sctx->stat.uncorrectable_errors++;
                 spin_unlock(&sctx->stat_lock);
-                btrfs_err_rl_in_rcu(sctx->dev_root->fs_info,
+                btrfs_err_rl_in_rcu(sctx->fs_info,
                         "failed to rebuild valid logical %llu for dev %s",
                         logical, rcu_str_deref(dev->name));
         } else {
@@ -2182,7 +2180,8 @@ static void scrub_missing_raid56_worker(struct btrfs_work *work)
 static void scrub_missing_raid56_pages(struct scrub_block *sblock)
 {
         struct scrub_ctx *sctx = sblock->sctx;
-        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
+        struct btrfs_root *dev_root = fs_info->dev_root;
         u64 length = sblock->page_count * PAGE_SIZE;
         u64 logical = sblock->pagev[0]->logical;
         struct btrfs_bio *bbio = NULL;
@@ -2215,7 +2214,7 @@ static void scrub_missing_raid56_pages(struct scrub_block *sblock)
         bio->bi_private = sblock;
         bio->bi_end_io = scrub_missing_raid56_end_io;
 
-        rbio = raid56_alloc_missing_rbio(sctx->dev_root, bio, bbio, length);
+        rbio = raid56_alloc_missing_rbio(dev_root, bio, bbio, length);
         if (!rbio)
                 goto rbio_out;
 
@@ -2334,7 +2333,7 @@ leave_nomem:
 static void scrub_bio_end_io(struct bio *bio)
 {
         struct scrub_bio *sbio = bio->bi_private;
-        struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sbio->dev->fs_info;
 
         sbio->err = bio->bi_error;
         sbio->bio = bio;
@@ -2391,7 +2390,7 @@ static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
 {
         u32 offset;
         int nsectors;
-        int sectorsize = sparity->sctx->dev_root->sectorsize;
+        int sectorsize = sparity->sctx->fs_info->dev_root->sectorsize;
 
         if (len >= sparity->stripe_len) {
                 bitmap_set(bitmap, 0, sparity->nsectors);
@@ -2759,13 +2758,14 @@ static void scrub_parity_bio_endio(struct bio *bio)
 
         btrfs_init_work(&sparity->work, btrfs_scrubparity_helper,
                         scrub_parity_bio_endio_worker, NULL, NULL);
-        btrfs_queue_work(sparity->sctx->dev_root->fs_info->scrub_parity_workers,
+        btrfs_queue_work(sparity->sctx->fs_info->scrub_parity_workers,
                          &sparity->work);
 }
 
 static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
 {
         struct scrub_ctx *sctx = sparity->sctx;
+        struct btrfs_root *dev_root = sctx->fs_info->dev_root;
         struct bio *bio;
         struct btrfs_raid_bio *rbio;
         struct scrub_page *spage;
@@ -2778,7 +2778,7 @@ static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
                 goto out;
 
         length = sparity->logic_end - sparity->logic_start;
-        ret = btrfs_map_sblock(sctx->dev_root->fs_info, BTRFS_MAP_WRITE,
+        ret = btrfs_map_sblock(sctx->fs_info, BTRFS_MAP_WRITE,
                                sparity->logic_start,
                                &length, &bbio, 0, 1);
         if (ret || !bbio || !bbio->raid_map)
@@ -2792,7 +2792,7 @@ static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
         bio->bi_private = sparity;
         bio->bi_end_io = scrub_parity_bio_endio;
 
-        rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio,
+        rbio = raid56_parity_alloc_scrub_rbio(dev_root, bio, bbio,
                                               length, sparity->scrub_dev,
                                               sparity->dbitmap,
                                               sparity->nsectors);
@@ -2844,7 +2844,7 @@ static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
                                                   u64 logic_start,
                                                   u64 logic_end)
 {
-        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
         struct btrfs_root *root = fs_info->extent_root;
         struct btrfs_root *csum_root = fs_info->csum_root;
         struct btrfs_extent_item *extent;
@@ -3069,7 +3069,7 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
                                            int is_dev_replace)
 {
         struct btrfs_path *path, *ppath;
-        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
         struct btrfs_root *root = fs_info->extent_root;
         struct btrfs_root *csum_root = fs_info->csum_root;
         struct btrfs_extent_item *extent;
@@ -3443,8 +3443,8 @@ static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
                                           struct btrfs_block_group_cache *cache,
                                           int is_dev_replace)
 {
-        struct btrfs_mapping_tree *map_tree =
-                &sctx->dev_root->fs_info->mapping_tree;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
+        struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
         struct map_lookup *map;
         struct extent_map *em;
         int i;
@@ -3497,7 +3497,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
 {
         struct btrfs_dev_extent *dev_extent = NULL;
         struct btrfs_path *path;
-        struct btrfs_root *root = sctx->dev_root;
+        struct btrfs_root *root = sctx->fs_info->dev_root;
         struct btrfs_fs_info *fs_info = root->fs_info;
         u64 length;
         u64 chunk_offset;
@@ -3747,7 +3747,7 @@ static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
         u64     bytenr;
         u64     gen;
         int     ret;
-        struct btrfs_root *root = sctx->dev_root;
+        struct btrfs_root *root = sctx->fs_info->dev_root;
 
         if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
                 return -EIO;
@@ -4123,7 +4123,7 @@ static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
                             int mirror_num, u64 physical_for_dev_replace)
 {
         struct scrub_copy_nocow_ctx *nocow_ctx;
-        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = sctx->fs_info;
 
         nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS);
         if (!nocow_ctx) {
@@ -4182,7 +4182,7 @@ static void copy_nocow_pages_worker(struct btrfs_work *work)
         struct btrfs_root *root;
         int not_written = 0;
 
-        fs_info = sctx->dev_root->fs_info;
+        fs_info = sctx->fs_info;
         root = fs_info->extent_root;
 
         path = btrfs_alloc_path();
@@ -4297,7 +4297,7 @@ out_unlock:
 static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
                                       struct scrub_copy_nocow_ctx *nocow_ctx)
 {
-        struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = nocow_ctx->sctx->fs_info;
         struct btrfs_key key;
         struct inode *inode;
         struct page *page;
@@ -4427,7 +4427,7 @@ static int write_page_nocow(struct scrub_ctx *sctx,
         if (!dev)
                 return -EIO;
         if (!dev->bdev) {
-                btrfs_warn_rl(dev->dev_root->fs_info,
+                btrfs_warn_rl(dev->fs_info,
                         "scrub write_page_nocow(bdev == NULL) is unexpected");
                 return -EIO;
         }
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 1622dc7eab91..4a21d82e1fb6 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -367,7 +367,7 @@ static noinline void run_scheduled_bios(struct btrfs_device *device)
         blk_start_plug(&plug);
 
         bdi = blk_get_backing_dev_info(device->bdev);
-        fs_info = device->dev_root->fs_info;
+        fs_info = device->fs_info;
         limit = btrfs_async_submit_limit(fs_info);
         limit = limit * 2 / 3;
 
@@ -1179,7 +1179,7 @@ int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
                                    u64 end, u64 *length)
 {
         struct btrfs_key key;
-        struct btrfs_root *root = device->dev_root;
+        struct btrfs_root *root = device->fs_info->dev_root;
         struct btrfs_dev_extent *dev_extent;
         struct btrfs_path *path;
         u64 extent_end;
@@ -1262,7 +1262,7 @@ static int contains_pending_extent(struct btrfs_transaction *transaction,
                                    struct btrfs_device *device,
                                    u64 *start, u64 len)
 {
-        struct btrfs_fs_info *fs_info = device->dev_root->fs_info;
+        struct btrfs_fs_info *fs_info = device->fs_info;
         struct extent_map *em;
         struct list_head *search_list = &fs_info->pinned_chunks;
         int ret = 0;
@@ -1338,8 +1338,8 @@ int find_free_dev_extent_start(struct btrfs_transaction *transaction,
                                struct btrfs_device *device, u64 num_bytes,
                                u64 search_start, u64 *start, u64 *len)
 {
+        struct btrfs_root *root = device->fs_info->dev_root;
         struct btrfs_key key;
-        struct btrfs_root *root = device->dev_root;
         struct btrfs_dev_extent *dev_extent;
         struct btrfs_path *path;
         u64 hole_size;
@@ -1508,9 +1508,9 @@ static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
                           struct btrfs_device *device,
                           u64 start, u64 *dev_extent_len)
 {
+        struct btrfs_root *root = device->fs_info->dev_root;
         int ret;
         struct btrfs_path *path;
-        struct btrfs_root *root = device->dev_root;
         struct btrfs_key key;
         struct btrfs_key found_key;
         struct extent_buffer *leaf = NULL;
@@ -1569,7 +1569,7 @@ static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
 {
         int ret;
         struct btrfs_path *path;
-        struct btrfs_root *root = device->dev_root;
+        struct btrfs_root *root = device->fs_info->dev_root;
         struct btrfs_dev_extent *extent;
         struct extent_buffer *leaf;
         struct btrfs_key key;
@@ -2387,7 +2387,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, char *device_path)
         device->total_bytes = i_size_read(bdev->bd_inode);
         device->disk_total_bytes = device->total_bytes;
         device->commit_total_bytes = device->total_bytes;
-        device->dev_root = root->fs_info->dev_root;
+        device->fs_info = fs_info;
         device->bdev = bdev;
         device->in_fs_metadata = 1;
         device->is_tgtdev_for_dev_replace = 0;
@@ -2596,7 +2596,7 @@ int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
         ASSERT(list_empty(&srcdev->resized_list));
         device->commit_total_bytes = srcdev->commit_total_bytes;
         device->commit_bytes_used = device->bytes_used;
-        device->dev_root = fs_info->dev_root;
+        device->fs_info = fs_info;
         device->bdev = bdev;
         device->in_fs_metadata = 1;
         device->is_tgtdev_for_dev_replace = 1;
@@ -2624,7 +2624,7 @@ void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
         tgtdev->io_width = fs_info->dev_root->sectorsize;
         tgtdev->io_align = fs_info->dev_root->sectorsize;
         tgtdev->sector_size = fs_info->dev_root->sectorsize;
-        tgtdev->dev_root = fs_info->dev_root;
+        tgtdev->fs_info = fs_info;
         tgtdev->in_fs_metadata = 1;
 }
 
@@ -2638,7 +2638,7 @@ static noinline int btrfs_update_device(struct btrfs_trans_handle *trans,
         struct extent_buffer *leaf;
         struct btrfs_key key;
 
-        root = device->dev_root->fs_info->chunk_root;
+        root = device->fs_info->chunk_root;
 
         path = btrfs_alloc_path();
         if (!path)
@@ -2679,8 +2679,7 @@ out:
 int btrfs_grow_device(struct btrfs_trans_handle *trans,
                       struct btrfs_device *device, u64 new_size)
 {
-        struct btrfs_super_block *super_copy =
-                device->dev_root->fs_info->super_copy;
+        struct btrfs_super_block *super_copy = device->fs_info->super_copy;
         struct btrfs_fs_devices *fs_devices;
         u64 old_total;
         u64 diff;
@@ -2688,28 +2687,28 @@ int btrfs_grow_device(struct btrfs_trans_handle *trans,
         if (!device->writeable)
                 return -EACCES;
 
-        lock_chunks(device->dev_root);
+        lock_chunks(device->fs_info->dev_root);
         old_total = btrfs_super_total_bytes(super_copy);
         diff = new_size - device->total_bytes;
 
         if (new_size <= device->total_bytes ||
             device->is_tgtdev_for_dev_replace) {
-                unlock_chunks(device->dev_root);
+                unlock_chunks(device->fs_info->dev_root);
                 return -EINVAL;
         }
 
-        fs_devices = device->dev_root->fs_info->fs_devices;
+        fs_devices = device->fs_info->fs_devices;
 
         btrfs_set_super_total_bytes(super_copy, old_total + diff);
         device->fs_devices->total_rw_bytes += diff;
 
         btrfs_device_set_total_bytes(device, new_size);
         btrfs_device_set_disk_total_bytes(device, new_size);
-        btrfs_clear_space_info_full(device->dev_root->fs_info);
+        btrfs_clear_space_info_full(device->fs_info);
         if (list_empty(&device->resized_list))
                 list_add_tail(&device->resized_list,
                               &fs_devices->resized_devices);
-        unlock_chunks(device->dev_root);
+        unlock_chunks(device->fs_info->dev_root);
 
         return btrfs_update_device(trans, device);
 }
@@ -4356,7 +4355,7 @@ int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info)
 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
 {
         struct btrfs_trans_handle *trans;
-        struct btrfs_root *root = device->dev_root;
+        struct btrfs_root *root = device->fs_info->dev_root;
         struct btrfs_dev_extent *dev_extent = NULL;
         struct btrfs_path *path;
         u64 length;
@@ -6884,7 +6883,7 @@ void btrfs_init_devices_late(struct btrfs_fs_info *fs_info)
         while (fs_devices) {
                 mutex_lock(&fs_devices->device_list_mutex);
                 list_for_each_entry(device, &fs_devices->devices, dev_list)
-                        device->dev_root = fs_info->dev_root;
+                        device->fs_info = fs_info;
                 mutex_unlock(&fs_devices->device_list_mutex);
 
                 fs_devices = fs_devices->seed;
@@ -7060,7 +7059,7 @@ static void btrfs_dev_stat_print_on_error(struct btrfs_device *dev)
 {
         if (!dev->dev_stats_valid)
                 return;
-        btrfs_err_rl_in_rcu(dev->dev_root->fs_info,
+        btrfs_err_rl_in_rcu(dev->fs_info,
                 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u",
                            rcu_str_deref(dev->name),
                            btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
@@ -7080,7 +7079,7 @@ static void btrfs_dev_stat_print_on_load(struct btrfs_device *dev)
         if (i == BTRFS_DEV_STAT_VALUES_MAX)
                 return; /* all values == 0, suppress message */
 
-        btrfs_info_in_rcu(dev->dev_root->fs_info,
+        btrfs_info_in_rcu(dev->fs_info,
                 "bdev %s errs: wr %u, rd %u, flush %u, corrupt %u, gen %u",
                rcu_str_deref(dev->name),
                btrfs_dev_stat_read(dev, BTRFS_DEV_STAT_WRITE_ERRS),
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 0c8e77bfa8f6..859221769696 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -51,8 +51,7 @@ struct btrfs_device {
         struct list_head dev_list;
         struct list_head dev_alloc_list;
         struct btrfs_fs_devices *fs_devices;
-
-        struct btrfs_root *dev_root;
+        struct btrfs_fs_info *fs_info;
 
         struct rcu_string *name;