Merge tag 'v3.13-rc4' into core/locking

Merge Linux 3.13-rc4, to refresh this rather old tree with the latest fixes.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

19 files changed, 146 insertions, 155 deletions

diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index f9d5094e1029..aa976eced2d2 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -9,12 +9,17 @@ config BTRFS_FS
         select XOR_BLOCKS
 
         help
-          Btrfs is a new filesystem with extents, writable snapshotting,
-          support for multiple devices and many more features.
+          Btrfs is a general purpose copy-on-write filesystem with extents,
+          writable snapshotting, support for multiple devices and many more
+          features focused on fault tolerance, repair and easy administration.
 
-          Btrfs is highly experimental, and THE DISK FORMAT IS NOT YET
-          FINALIZED.  You should say N here unless you are interested in
-          testing Btrfs with non-critical data.
+          The filesystem disk format is no longer unstable, and it's not
+          expected to change unless there are strong reasons to do so. If there
+          is a format change, file systems with a unchanged format will
+          continue to be mountable and usable by newer kernels.
+
+          For more information, please see the web pages at
+          http://btrfs.wiki.kernel.org.
 
           To compile this file system support as a module, choose M here. The
           module will be called btrfs.
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index 8aec751fa464..c1e0b0caf9cc 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -495,6 +495,7 @@ static int __btrfs_start_workers(struct btrfs_workers *workers)
         spin_lock_irq(&workers->lock);
         if (workers->stopping) {
                 spin_unlock_irq(&workers->lock);
+                ret = -EINVAL;
                 goto fail_kthread;
         }
         list_add_tail(&worker->worker_list, &workers->idle_list);
diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index e0aab4456974..131d82800b3a 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -77,6 +77,15 @@
  * the integrity of (super)-block write requests, do not
  * enable the config option BTRFS_FS_CHECK_INTEGRITY to
  * include and compile the integrity check tool.
+ *
+ * Expect millions of lines of information in the kernel log with an
+ * enabled check_int_print_mask. Therefore set LOG_BUF_SHIFT in the
+ * kernel config to at least 26 (which is 64MB). Usually the value is
+ * limited to 21 (which is 2MB) in init/Kconfig. The file needs to be
+ * changed like this before LOG_BUF_SHIFT can be set to a high value:
+ * config LOG_BUF_SHIFT
+ *       int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
+ *       range 12 30
  */
 
 #include <linux/sched.h>
@@ -124,6 +133,7 @@
 #define BTRFSIC_PRINT_MASK_INITIAL_DATABASE                     0x00000400
 #define BTRFSIC_PRINT_MASK_NUM_COPIES                           0x00000800
 #define BTRFSIC_PRINT_MASK_TREE_WITH_ALL_MIRRORS                0x00001000
+#define BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE                0x00002000
 
 struct btrfsic_dev_state;
 struct btrfsic_state;
@@ -323,7 +333,6 @@ static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx);
 static int btrfsic_read_block(struct btrfsic_state *state,
                               struct btrfsic_block_data_ctx *block_ctx);
 static void btrfsic_dump_database(struct btrfsic_state *state);
-static void btrfsic_complete_bio_end_io(struct bio *bio, int err);
 static int btrfsic_test_for_metadata(struct btrfsic_state *state,
                                      char **datav, unsigned int num_pages);
 static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
@@ -1677,7 +1686,6 @@ static int btrfsic_read_block(struct btrfsic_state *state,
         for (i = 0; i < num_pages;) {
                 struct bio *bio;
                 unsigned int j;
-                DECLARE_COMPLETION_ONSTACK(complete);
 
                 bio = btrfs_io_bio_alloc(GFP_NOFS, num_pages - i);
                 if (!bio) {
@@ -1688,8 +1696,6 @@ static int btrfsic_read_block(struct btrfsic_state *state,
                 }
                 bio->bi_bdev = block_ctx->dev->bdev;
                 bio->bi_sector = dev_bytenr >> 9;
-                bio->bi_end_io = btrfsic_complete_bio_end_io;
-                bio->bi_private = &complete;
 
                 for (j = i; j < num_pages; j++) {
                         ret = bio_add_page(bio, block_ctx->pagev[j],
@@ -1702,12 +1708,7 @@ static int btrfsic_read_block(struct btrfsic_state *state,
                                "btrfsic: error, failed to add a single page!\n");
                         return -1;
                 }
-                submit_bio(READ, bio);
-
-                /* this will also unplug the queue */
-                wait_for_completion(&complete);
-
-                if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
+                if (submit_bio_wait(READ, bio)) {
                         printk(KERN_INFO
                                "btrfsic: read error at logical %llu dev %s!\n",
                                block_ctx->start, block_ctx->dev->name);
@@ -1730,11 +1731,6 @@ static int btrfsic_read_block(struct btrfsic_state *state,
         return block_ctx->len;
 }
 
-static void btrfsic_complete_bio_end_io(struct bio *bio, int err)
-{
-        complete((struct completion *)bio->bi_private);
-}
-
 static void btrfsic_dump_database(struct btrfsic_state *state)
 {
         struct list_head *elem_all;
@@ -2998,14 +2994,12 @@ int btrfsic_submit_bh(int rw, struct buffer_head *bh)
         return submit_bh(rw, bh);
 }
 
-void btrfsic_submit_bio(int rw, struct bio *bio)
+static void __btrfsic_submit_bio(int rw, struct bio *bio)
 {
         struct btrfsic_dev_state *dev_state;
 
-        if (!btrfsic_is_initialized) {
-                submit_bio(rw, bio);
+        if (!btrfsic_is_initialized)
                 return;
-        }
 
         mutex_lock(&btrfsic_mutex);
         /* since btrfsic_submit_bio() is also called before
@@ -3015,6 +3009,7 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
             (rw & WRITE) && NULL != bio->bi_io_vec) {
                 unsigned int i;
                 u64 dev_bytenr;
+                u64 cur_bytenr;
                 int bio_is_patched;
                 char **mapped_datav;
 
@@ -3033,6 +3028,7 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
                                        GFP_NOFS);
                 if (!mapped_datav)
                         goto leave;
+                cur_bytenr = dev_bytenr;
                 for (i = 0; i < bio->bi_vcnt; i++) {
                         BUG_ON(bio->bi_io_vec[i].bv_len != PAGE_CACHE_SIZE);
                         mapped_datav[i] = kmap(bio->bi_io_vec[i].bv_page);
@@ -3044,16 +3040,13 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
                                 kfree(mapped_datav);
                                 goto leave;
                         }
-                        if ((BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
-                             BTRFSIC_PRINT_MASK_VERBOSE) ==
-                            (dev_state->state->print_mask &
-                             (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
-                              BTRFSIC_PRINT_MASK_VERBOSE)))
+                        if (dev_state->state->print_mask &
+                            BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH_VERBOSE)
                                 printk(KERN_INFO
-                                       "#%u: page=%p, len=%u, offset=%u\n",
-                                       i, bio->bi_io_vec[i].bv_page,
-                                       bio->bi_io_vec[i].bv_len,
+                                       "#%u: bytenr=%llu, len=%u, offset=%u\n",
+                                       i, cur_bytenr, bio->bi_io_vec[i].bv_len,
                                        bio->bi_io_vec[i].bv_offset);
+                        cur_bytenr += bio->bi_io_vec[i].bv_len;
                 }
                 btrfsic_process_written_block(dev_state, dev_bytenr,
                                               mapped_datav, bio->bi_vcnt,
@@ -3097,10 +3090,20 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
         }
 leave:
         mutex_unlock(&btrfsic_mutex);
+}
 
+void btrfsic_submit_bio(int rw, struct bio *bio)
+{
+        __btrfsic_submit_bio(rw, bio);
         submit_bio(rw, bio);
 }
 
+int btrfsic_submit_bio_wait(int rw, struct bio *bio)
+{
+        __btrfsic_submit_bio(rw, bio);
+        return submit_bio_wait(rw, bio);
+}
+
 int btrfsic_mount(struct btrfs_root *root,
                   struct btrfs_fs_devices *fs_devices,
                   int including_extent_data, u32 print_mask)
diff --git a/fs/btrfs/check-integrity.h b/fs/btrfs/check-integrity.h
index 8b59175cc502..13b8566c97ab 100644
--- a/fs/btrfs/check-integrity.h
+++ b/fs/btrfs/check-integrity.h
@@ -22,9 +22,11 @@
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 int btrfsic_submit_bh(int rw, struct buffer_head *bh);
 void btrfsic_submit_bio(int rw, struct bio *bio);
+int btrfsic_submit_bio_wait(int rw, struct bio *bio);
 #else
 #define btrfsic_submit_bh submit_bh
 #define btrfsic_submit_bio submit_bio
+#define btrfsic_submit_bio_wait submit_bio_wait
 #endif
 
 int btrfsic_mount(struct btrfs_root *root,
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f9aeb2759a64..54ab86127f7a 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3613,9 +3613,6 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
                            struct btrfs_ordered_sum *sums);
 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
                        struct bio *bio, u64 file_start, int contig);
-int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
-                        struct btrfs_root *root, struct btrfs_path *path,
-                        u64 isize);
 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
                              struct list_head *list, int search_commit);
 /* inode.c */
@@ -3744,9 +3741,6 @@ void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                              int skip_pinned);
-int btrfs_replace_extent_cache(struct inode *inode, struct extent_map *replace,
-                               u64 start, u64 end, int skip_pinned,
-                               int modified);
 extern const struct file_operations btrfs_file_operations;
 int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
                          struct btrfs_root *root, struct inode *inode,
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 342f9fd411e3..2cfc3dfff64f 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -366,7 +366,7 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
         dev_replace->tgtdev = tgt_device;
 
         printk_in_rcu(KERN_INFO
-                      "btrfs: dev_replace from %s (devid %llu) to %s) started\n",
+                      "btrfs: dev_replace from %s (devid %llu) to %s started\n",
                       src_device->missing ? "<missing disk>" :
                         rcu_str_deref(src_device->name),
                       src_device->devid,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4c4ed0bb3da1..8072cfa8a3b1 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3517,7 +3517,6 @@ int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
 int btrfs_commit_super(struct btrfs_root *root)
 {
         struct btrfs_trans_handle *trans;
-        int ret;
 
         mutex_lock(&root->fs_info->cleaner_mutex);
         btrfs_run_delayed_iputs(root);
@@ -3531,25 +3530,7 @@ int btrfs_commit_super(struct btrfs_root *root)
         trans = btrfs_join_transaction(root);
         if (IS_ERR(trans))
                 return PTR_ERR(trans);
-        ret = btrfs_commit_transaction(trans, root);
-        if (ret)
-                return ret;
-        /* run commit again to drop the original snapshot */
-        trans = btrfs_join_transaction(root);
-        if (IS_ERR(trans))
-                return PTR_ERR(trans);
-        ret = btrfs_commit_transaction(trans, root);
-        if (ret)
-                return ret;
-        ret = btrfs_write_and_wait_transaction(NULL, root);
-        if (ret) {
-                btrfs_error(root->fs_info, ret,
-                            "Failed to sync btree inode to disk.");
-                return ret;
-        }
-
-        ret = write_ctree_super(NULL, root, 0);
-        return ret;
+        return btrfs_commit_transaction(trans, root);
 }
 
 int close_ctree(struct btrfs_root *root)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 45d98d01028f..9c01509dd8ab 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -767,20 +767,19 @@ int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
         if (!path)
                 return -ENOMEM;
 
-        if (metadata) {
-                key.objectid = bytenr;
-                key.type = BTRFS_METADATA_ITEM_KEY;
-                key.offset = offset;
-        } else {
-                key.objectid = bytenr;
-                key.type = BTRFS_EXTENT_ITEM_KEY;
-                key.offset = offset;
-        }
-
         if (!trans) {
                 path->skip_locking = 1;
                 path->search_commit_root = 1;
         }
+
+search_again:
+        key.objectid = bytenr;
+        key.offset = offset;
+        if (metadata)
+                key.type = BTRFS_METADATA_ITEM_KEY;
+        else
+                key.type = BTRFS_EXTENT_ITEM_KEY;
+
 again:
         ret = btrfs_search_slot(trans, root->fs_info->extent_root,
                                 &key, path, 0, 0);
@@ -788,7 +787,6 @@ again:
                 goto out_free;
 
         if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) {
-                metadata = 0;
                 if (path->slots[0]) {
                         path->slots[0]--;
                         btrfs_item_key_to_cpu(path->nodes[0], &key,
@@ -855,7 +853,7 @@ again:
                         mutex_lock(&head->mutex);
                         mutex_unlock(&head->mutex);
                         btrfs_put_delayed_ref(&head->node);
-                        goto again;
+                        goto search_again;
                 }
                 if (head->extent_op && head->extent_op->update_flags)
                         extent_flags |= head->extent_op->flags_to_set;
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 856bc2b2192c..ff43802a7c88 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1952,11 +1952,6 @@ static int free_io_failure(struct inode *inode, struct io_failure_record *rec,
         return err;
 }
 
-static void repair_io_failure_callback(struct bio *bio, int err)
-{
-        complete(bio->bi_private);
-}
-
 /*
  * this bypasses the standard btrfs submit functions deliberately, as
  * the standard behavior is to write all copies in a raid setup. here we only
@@ -1973,13 +1968,13 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
 {
         struct bio *bio;
         struct btrfs_device *dev;
-        DECLARE_COMPLETION_ONSTACK(compl);
         u64 map_length = 0;
         u64 sector;
         struct btrfs_bio *bbio = NULL;
         struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
         int ret;
 
+        ASSERT(!(fs_info->sb->s_flags & MS_RDONLY));
         BUG_ON(!mirror_num);
 
         /* we can't repair anything in raid56 yet */
@@ -1989,8 +1984,6 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
         bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
         if (!bio)
                 return -EIO;
-        bio->bi_private = &compl;
-        bio->bi_end_io = repair_io_failure_callback;
         bio->bi_size = 0;
         map_length = length;
 
@@ -2011,10 +2004,8 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
         }
         bio->bi_bdev = dev->bdev;
         bio_add_page(bio, page, length, start - page_offset(page));
-        btrfsic_submit_bio(WRITE_SYNC, bio);
-        wait_for_completion(&compl);
 
-        if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
+        if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) {
                 /* try to remap that extent elsewhere? */
                 bio_put(bio);
                 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
@@ -2036,6 +2027,9 @@ int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
         unsigned long i, num_pages = num_extent_pages(eb->start, eb->len);
         int ret = 0;
 
+        if (root->fs_info->sb->s_flags & MS_RDONLY)
+                return -EROFS;
+
         for (i = 0; i < num_pages; i++) {
                 struct page *p = extent_buffer_page(eb, i);
                 ret = repair_io_failure(root->fs_info, start, PAGE_CACHE_SIZE,
@@ -2057,12 +2051,12 @@ static int clean_io_failure(u64 start, struct page *page)
         u64 private;
         u64 private_failure;
         struct io_failure_record *failrec;
-        struct btrfs_fs_info *fs_info;
+        struct inode *inode = page->mapping->host;
+        struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
         struct extent_state *state;
         int num_copies;
         int did_repair = 0;
         int ret;
-        struct inode *inode = page->mapping->host;
 
         private = 0;
         ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
@@ -2085,6 +2079,8 @@ static int clean_io_failure(u64 start, struct page *page)
                 did_repair = 1;
                 goto out;
         }
+        if (fs_info->sb->s_flags & MS_RDONLY)
+                goto out;
 
         spin_lock(&BTRFS_I(inode)->io_tree.lock);
         state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
@@ -2094,7 +2090,6 @@ static int clean_io_failure(u64 start, struct page *page)
 
         if (state && state->start <= failrec->start &&
             state->end >= failrec->start + failrec->len - 1) {
-                fs_info = BTRFS_I(inode)->root->fs_info;
                 num_copies = btrfs_num_copies(fs_info, failrec->logical,
                                               failrec->len);
                 if (num_copies > 1)  {
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index da8d2f696ac5..f1a77449d032 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2129,7 +2129,8 @@ static noinline bool record_extent_backrefs(struct btrfs_path *path,
                                                   old->extent_offset, fs_info,
                                                   path, record_one_backref,
                                                   old);
-                BUG_ON(ret < 0 && ret != -ENOENT);
+                if (ret < 0 && ret != -ENOENT)
+                        return false;
 
                 /* no backref to be processed for this extent */
                 if (!old->count) {
@@ -6186,8 +6187,7 @@ insert:
         write_unlock(&em_tree->lock);
 out:
 
-        if (em)
-                trace_btrfs_get_extent(root, em);
+        trace_btrfs_get_extent(root, em);
 
         if (path)
                 btrfs_free_path(path);
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a111622598b0..21da5762b0b1 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2121,7 +2121,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
 
         err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
         if (err == -EINTR)
-                goto out;
+                goto out_drop_write;
         dentry = lookup_one_len(vol_args->name, parent, namelen);
         if (IS_ERR(dentry)) {
                 err = PTR_ERR(dentry);
@@ -2284,6 +2284,7 @@ out_dput:
         dput(dentry);
 out_unlock_dir:
         mutex_unlock(&dir->i_mutex);
+out_drop_write:
         mnt_drop_write_file(file);
 out:
         kfree(vol_args);
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 25a8f3812f14..69582d5b69d1 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -638,6 +638,7 @@ void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, int nr)
                         WARN_ON(nr < 0);
                 }
         }
+        list_splice_tail(&splice, &fs_info->ordered_roots);
         spin_unlock(&fs_info->ordered_root_lock);
 }
 
@@ -803,7 +804,7 @@ int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
                         btrfs_put_ordered_extent(ordered);
                         break;
                 }
-                if (ordered->file_offset + ordered->len < start) {
+                if (ordered->file_offset + ordered->len <= start) {
                         btrfs_put_ordered_extent(ordered);
                         break;
                 }
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index ce459a7cb16d..429c73c374b8 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -571,7 +571,9 @@ static int is_cowonly_root(u64 root_objectid)
             root_objectid == BTRFS_CHUNK_TREE_OBJECTID ||
             root_objectid == BTRFS_DEV_TREE_OBJECTID ||
             root_objectid == BTRFS_TREE_LOG_OBJECTID ||
-            root_objectid == BTRFS_CSUM_TREE_OBJECTID)
+            root_objectid == BTRFS_CSUM_TREE_OBJECTID ||
+            root_objectid == BTRFS_UUID_TREE_OBJECTID ||
+            root_objectid == BTRFS_QUOTA_TREE_OBJECTID)
                 return 1;
         return 0;
 }
@@ -1264,10 +1266,10 @@ static int __must_check __add_reloc_root(struct btrfs_root *root)
 }
 
 /*
- * helper to update/delete the 'address of tree root -> reloc tree'
+ * helper to delete the 'address of tree root -> reloc tree'
  * mapping
  */
-static int __update_reloc_root(struct btrfs_root *root, int del)
+static void __del_reloc_root(struct btrfs_root *root)
 {
         struct rb_node *rb_node;
         struct mapping_node *node = NULL;
@@ -1275,7 +1277,7 @@ static int __update_reloc_root(struct btrfs_root *root, int del)
 
         spin_lock(&rc->reloc_root_tree.lock);
         rb_node = tree_search(&rc->reloc_root_tree.rb_root,
-                              root->commit_root->start);
+                              root->node->start);
         if (rb_node) {
                 node = rb_entry(rb_node, struct mapping_node, rb_node);
                 rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root);
@@ -1283,23 +1285,45 @@ static int __update_reloc_root(struct btrfs_root *root, int del)
         spin_unlock(&rc->reloc_root_tree.lock);
 
         if (!node)
-                return 0;
+                return;
         BUG_ON((struct btrfs_root *)node->data != root);
 
-        if (!del) {
-                spin_lock(&rc->reloc_root_tree.lock);
-                node->bytenr = root->node->start;
-                rb_node = tree_insert(&rc->reloc_root_tree.rb_root,
-                                      node->bytenr, &node->rb_node);
-                spin_unlock(&rc->reloc_root_tree.lock);
-                if (rb_node)
-                        backref_tree_panic(rb_node, -EEXIST, node->bytenr);
-        } else {
-                spin_lock(&root->fs_info->trans_lock);
-                list_del_init(&root->root_list);
-                spin_unlock(&root->fs_info->trans_lock);
-                kfree(node);
+        spin_lock(&root->fs_info->trans_lock);
+        list_del_init(&root->root_list);
+        spin_unlock(&root->fs_info->trans_lock);
+        kfree(node);
+}
+
+/*
+ * helper to update the 'address of tree root -> reloc tree'
+ * mapping
+ */
+static int __update_reloc_root(struct btrfs_root *root, u64 new_bytenr)
+{
+        struct rb_node *rb_node;
+        struct mapping_node *node = NULL;
+        struct reloc_control *rc = root->fs_info->reloc_ctl;
+
+        spin_lock(&rc->reloc_root_tree.lock);
+        rb_node = tree_search(&rc->reloc_root_tree.rb_root,
+                              root->node->start);
+        if (rb_node) {
+                node = rb_entry(rb_node, struct mapping_node, rb_node);
+                rb_erase(&node->rb_node, &rc->reloc_root_tree.rb_root);
         }
+        spin_unlock(&rc->reloc_root_tree.lock);
+
+        if (!node)
+                return 0;
+        BUG_ON((struct btrfs_root *)node->data != root);
+
+        spin_lock(&rc->reloc_root_tree.lock);
+        node->bytenr = new_bytenr;
+        rb_node = tree_insert(&rc->reloc_root_tree.rb_root,
+                              node->bytenr, &node->rb_node);
+        spin_unlock(&rc->reloc_root_tree.lock);
+        if (rb_node)
+                backref_tree_panic(rb_node, -EEXIST, node->bytenr);
         return 0;
 }
 
@@ -1420,7 +1444,6 @@ int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
 {
         struct btrfs_root *reloc_root;
         struct btrfs_root_item *root_item;
-        int del = 0;
         int ret;
 
         if (!root->reloc_root)
@@ -1432,11 +1455,9 @@ int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
         if (root->fs_info->reloc_ctl->merge_reloc_tree &&
             btrfs_root_refs(root_item) == 0) {
                 root->reloc_root = NULL;
-                del = 1;
+                __del_reloc_root(reloc_root);
         }
 
-        __update_reloc_root(reloc_root, del);
-
         if (reloc_root->commit_root != reloc_root->node) {
                 btrfs_set_root_node(root_item, reloc_root->node);
                 free_extent_buffer(reloc_root->commit_root);
@@ -2287,7 +2308,7 @@ void free_reloc_roots(struct list_head *list)
         while (!list_empty(list)) {
                 reloc_root = list_entry(list->next, struct btrfs_root,
                                         root_list);
-                __update_reloc_root(reloc_root, 1);
+                __del_reloc_root(reloc_root);
                 free_extent_buffer(reloc_root->node);
                 free_extent_buffer(reloc_root->commit_root);
                 kfree(reloc_root);
@@ -2332,7 +2353,7 @@ again:
 
                         ret = merge_reloc_root(rc, root);
                         if (ret) {
-                                __update_reloc_root(reloc_root, 1);
+                                __del_reloc_root(reloc_root);
                                 free_extent_buffer(reloc_root->node);
                                 free_extent_buffer(reloc_root->commit_root);
                                 kfree(reloc_root);
@@ -2388,6 +2409,13 @@ out:
                 btrfs_std_error(root->fs_info, ret);
                 if (!list_empty(&reloc_roots))
                         free_reloc_roots(&reloc_roots);
+
+                /* new reloc root may be added */
+                mutex_lock(&root->fs_info->reloc_mutex);
+                list_splice_init(&rc->reloc_roots, &reloc_roots);
+                mutex_unlock(&root->fs_info->reloc_mutex);
+                if (!list_empty(&reloc_roots))
+                        free_reloc_roots(&reloc_roots);
         }
 
         BUG_ON(!RB_EMPTY_ROOT(&rc->reloc_root_tree.rb_root));
@@ -4522,6 +4550,11 @@ int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
         BUG_ON(rc->stage == UPDATE_DATA_PTRS &&
                root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID);
 
+        if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) {
+                if (buf == root->node)
+                        __update_reloc_root(root, cow->start);
+        }
+
         level = btrfs_header_level(buf);
         if (btrfs_header_generation(buf) <=
             btrfs_root_last_snapshot(&root->root_item))
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 2544805544f0..1fd3f33c330a 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -208,7 +208,6 @@ static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
                                          int is_metadata, int have_csum,
                                          const u8 *csum, u64 generation,
                                          u16 csum_size);
-static void scrub_complete_bio_end_io(struct bio *bio, int err);
 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
                                              struct scrub_block *sblock_good,
                                              int force_write);
@@ -938,8 +937,10 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
                                 BTRFS_DEV_STAT_CORRUPTION_ERRS);
         }
 
-        if (sctx->readonly && !sctx->is_dev_replace)
-                goto did_not_correct_error;
+        if (sctx->readonly) {
+                ASSERT(!sctx->is_dev_replace);
+                goto out;
+        }
 
         if (!is_metadata && !have_csum) {
                 struct scrub_fixup_nodatasum *fixup_nodatasum;
@@ -1292,7 +1293,6 @@ static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
         for (page_num = 0; page_num < sblock->page_count; page_num++) {
                 struct bio *bio;
                 struct scrub_page *page = sblock->pagev[page_num];
-                DECLARE_COMPLETION_ONSTACK(complete);
 
                 if (page->dev->bdev == NULL) {
                         page->io_error = 1;
@@ -1309,18 +1309,11 @@ static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
                 }
                 bio->bi_bdev = page->dev->bdev;
                 bio->bi_sector = page->physical >> 9;
-                bio->bi_end_io = scrub_complete_bio_end_io;
-                bio->bi_private = &complete;
 
                 bio_add_page(bio, page->page, PAGE_SIZE, 0);
-                btrfsic_submit_bio(READ, bio);
-
-                /* this will also unplug the queue */
-                wait_for_completion(&complete);
-
-                page->io_error = !test_bit(BIO_UPTODATE, &bio->bi_flags);
-                if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
+                if (btrfsic_submit_bio_wait(READ, bio))
                         sblock->no_io_error_seen = 0;
+
                 bio_put(bio);
         }
 
@@ -1389,11 +1382,6 @@ static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
                 sblock->checksum_error = 1;
 }
 
-static void scrub_complete_bio_end_io(struct bio *bio, int err)
-{
-        complete((struct completion *)bio->bi_private);
-}
-
 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
                                              struct scrub_block *sblock_good,
                                              int force_write)
@@ -1428,7 +1416,6 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
             sblock_bad->checksum_error || page_bad->io_error) {
                 struct bio *bio;
                 int ret;
-                DECLARE_COMPLETION_ONSTACK(complete);
 
                 if (!page_bad->dev->bdev) {
                         printk_ratelimited(KERN_WARNING
@@ -1441,19 +1428,14 @@ static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
                         return -EIO;
                 bio->bi_bdev = page_bad->dev->bdev;
                 bio->bi_sector = page_bad->physical >> 9;
-                bio->bi_end_io = scrub_complete_bio_end_io;
-                bio->bi_private = &complete;
 
                 ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0);
                 if (PAGE_SIZE != ret) {
                         bio_put(bio);
                         return -EIO;
                 }
-                btrfsic_submit_bio(WRITE, bio);
 
-                /* this will also unplug the queue */
-                wait_for_completion(&complete);
-                if (!bio_flagged(bio, BIO_UPTODATE)) {
+                if (btrfsic_submit_bio_wait(WRITE, bio)) {
                         btrfs_dev_stat_inc_and_print(page_bad->dev,
                                 BTRFS_DEV_STAT_WRITE_ERRS);
                         btrfs_dev_replace_stats_inc(
@@ -3373,7 +3355,6 @@ static int write_page_nocow(struct scrub_ctx *sctx,
         struct bio *bio;
         struct btrfs_device *dev;
         int ret;
-        DECLARE_COMPLETION_ONSTACK(compl);
 
         dev = sctx->wr_ctx.tgtdev;
         if (!dev)
@@ -3390,8 +3371,6 @@ static int write_page_nocow(struct scrub_ctx *sctx,
                 spin_unlock(&sctx->stat_lock);
                 return -ENOMEM;
         }
-        bio->bi_private = &compl;
-        bio->bi_end_io = scrub_complete_bio_end_io;
         bio->bi_size = 0;
         bio->bi_sector = physical_for_dev_replace >> 9;
         bio->bi_bdev = dev->bdev;
@@ -3402,10 +3381,8 @@ leave_with_eio:
                 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
                 return -EIO;
         }
-        btrfsic_submit_bio(WRITE_SYNC, bio);
-        wait_for_completion(&compl);
 
-        if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
+        if (btrfsic_submit_bio_wait(WRITE_SYNC, bio))
                 goto leave_with_eio;
 
         bio_put(bio);
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 6837fe87f3a6..945d1db98f26 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4723,8 +4723,8 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
         }
 
         if (!access_ok(VERIFY_READ, arg->clone_sources,
-                        sizeof(*arg->clone_sources *
-                        arg->clone_sources_count))) {
+                        sizeof(*arg->clone_sources) *
+                        arg->clone_sources_count)) {
                 ret = -EFAULT;
                 goto out;
         }
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2d8ac1bf0cf9..d71a11d13dfa 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -432,7 +432,6 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
                         } else {
                                 printk(KERN_INFO "btrfs: setting nodatacow\n");
                         }
-                        info->compress_type = BTRFS_COMPRESS_NONE;
                         btrfs_clear_opt(info->mount_opt, COMPRESS);
                         btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
                         btrfs_set_opt(info->mount_opt, NODATACOW);
@@ -461,7 +460,6 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
                                 btrfs_set_fs_incompat(info, COMPRESS_LZO);
                         } else if (strncmp(args[0].from, "no", 2) == 0) {
                                 compress_type = "no";
-                                info->compress_type = BTRFS_COMPRESS_NONE;
                                 btrfs_clear_opt(info->mount_opt, COMPRESS);
                                 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
                                 compress_force = false;
@@ -474,9 +472,10 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
                                 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
                                 pr_info("btrfs: force %s compression\n",
                                         compress_type);
-                        } else
+                        } else if (btrfs_test_opt(root, COMPRESS)) {
                                 pr_info("btrfs: use %s compression\n",
                                         compress_type);
+                        }
                         break;
                 case Opt_ssd:
                         printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 57c16b46afbd..c6a872a8a468 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1480,7 +1480,7 @@ static void do_async_commit(struct work_struct *work)
          * We've got freeze protection passed with the transaction.
          * Tell lockdep about it.
          */
-        if (ac->newtrans->type < TRANS_JOIN_NOLOCK)
+        if (ac->newtrans->type & __TRANS_FREEZABLE)
                 rwsem_acquire_read(
                      &ac->root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
                      0, 1, _THIS_IP_);
@@ -1521,7 +1521,7 @@ int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
          * Tell lockdep we've released the freeze rwsem, since the
          * async commit thread will be the one to unlock it.
          */
-        if (trans->type < TRANS_JOIN_NOLOCK)
+        if (ac->newtrans->type & __TRANS_FREEZABLE)
                 rwsem_release(
                         &root->fs_info->sb->s_writers.lock_map[SB_FREEZE_FS-1],
                         1, _THIS_IP_);
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 744553c83fe2..9f7fc51ca334 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3697,7 +3697,8 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
                         ret = btrfs_truncate_inode_items(trans, log,
                                                          inode, 0, 0);
                 } else if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING,
-                                              &BTRFS_I(inode)->runtime_flags)) {
+                                              &BTRFS_I(inode)->runtime_flags) ||
+                           inode_only == LOG_INODE_EXISTS) {
                         if (inode_only == LOG_INODE_ALL)
                                 fast_search = true;
                         max_key.type = BTRFS_XATTR_ITEM_KEY;
@@ -3801,7 +3802,7 @@ log_extents:
                         err = ret;
                         goto out_unlock;
                 }
-        } else {
+        } else if (inode_only == LOG_INODE_ALL) {
                 struct extent_map_tree *tree = &BTRFS_I(inode)->extent_tree;
                 struct extent_map *em, *n;
 
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 0db637097862..92303f42baaa 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5394,7 +5394,7 @@ static int bio_size_ok(struct block_device *bdev, struct bio *bio,
 {
         struct bio_vec *prev;
         struct request_queue *q = bdev_get_queue(bdev);
-        unsigned short max_sectors = queue_max_sectors(q);
+        unsigned int max_sectors = queue_max_sectors(q);
         struct bvec_merge_data bvm = {
                 .bi_bdev = bdev,
                 .bi_sector = sector,