7 files changed, 47 insertions, 57 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 29c20092847e..eaf286abad17 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2389,13 +2389,13 @@ unsigned long btrfs_force_ra(struct address_space *mapping,
                               pgoff_t offset, pgoff_t last_index);
 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
 int btrfs_readpage(struct file *file, struct page *page);
-void btrfs_delete_inode(struct inode *inode);
+void btrfs_evict_inode(struct inode *inode);
 void btrfs_put_inode(struct inode *inode);
 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
 void btrfs_dirty_inode(struct inode *inode);
 struct inode *btrfs_alloc_inode(struct super_block *sb);
 void btrfs_destroy_inode(struct inode *inode);
-void btrfs_drop_inode(struct inode *inode);
+int btrfs_drop_inode(struct inode *inode);
 int btrfs_init_cachep(void);
 void btrfs_destroy_cachep(void);
 long btrfs_ioctl_trans_end(struct file *file);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 34f7c375567e..5e789f4a3ed0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -480,7 +480,7 @@ static void end_workqueue_bio(struct bio *bio, int err)
         end_io_wq->work.func = end_workqueue_fn;
         end_io_wq->work.flags = 0;
 
-        if (bio->bi_rw & (1 << BIO_RW)) {
+        if (bio->bi_rw & REQ_WRITE) {
                 if (end_io_wq->metadata)
                         btrfs_queue_worker(&fs_info->endio_meta_write_workers,
                                            &end_io_wq->work);
@@ -604,7 +604,7 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
 
         atomic_inc(&fs_info->nr_async_submits);
 
-        if (rw & (1 << BIO_RW_SYNCIO))
+        if (rw & REQ_SYNC)
                 btrfs_set_work_high_prio(&async->work);
 
         btrfs_queue_worker(&fs_info->workers, &async->work);
@@ -668,7 +668,7 @@ static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
                                           bio, 1);
         BUG_ON(ret);
 
-        if (!(rw & (1 << BIO_RW))) {
+        if (!(rw & REQ_WRITE)) {
                 /*
                  * called for a read, do the setup so that checksum validation
                  * can happen in the async kernel threads
@@ -1427,7 +1427,7 @@ static void end_workqueue_fn(struct btrfs_work *work)
          * ram and up to date before trying to verify things.  For
          * blocksize <= pagesize, it is basically a noop
          */
-        if (!(bio->bi_rw & (1 << BIO_RW)) && end_io_wq->metadata &&
+        if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata &&
             !bio_ready_for_csum(bio)) {
                 btrfs_queue_worker(&fs_info->endio_meta_workers,
                                    &end_io_wq->work);
@@ -2063,7 +2063,7 @@ static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
         if (uptodate) {
                 set_buffer_uptodate(bh);
         } else {
-                if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
+                if (printk_ratelimit()) {
                         printk(KERN_WARNING "lost page write due to "
                                         "I/O error on %s\n",
                                        bdevname(bh->b_bdev, b));
@@ -2200,21 +2200,10 @@ static int write_dev_supers(struct btrfs_device *device,
                         bh->b_end_io = btrfs_end_buffer_write_sync;
                 }
 
-                if (i == last_barrier && do_barriers && device->barriers) {
-                        ret = submit_bh(WRITE_BARRIER, bh);
-                        if (ret == -EOPNOTSUPP) {
-                                printk("btrfs: disabling barriers on dev %s\n",
-                                       device->name);
-                                set_buffer_uptodate(bh);
-                                device->barriers = 0;
-                                /* one reference for submit_bh */
-                                get_bh(bh);
-                                lock_buffer(bh);
-                                ret = submit_bh(WRITE_SYNC, bh);
-                        }
-                } else {
+                if (i == last_barrier && do_barriers)
+                        ret = submit_bh(WRITE_FLUSH_FUA, bh);
+                else
                         ret = submit_bh(WRITE_SYNC, bh);
-                }
 
                 if (ret)
                         errors++;
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 32d094002a57..0b81ecdb101c 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1695,8 +1695,7 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans,
 static void btrfs_issue_discard(struct block_device *bdev,
                                 u64 start, u64 len)
 {
-        blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL,
-                        BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER);
+        blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL, 0);
 }
 
 static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1bff92ad4744..64f99cf69ce0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1429,7 +1429,7 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
         ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
         BUG_ON(ret);
 
-        if (!(rw & (1 << BIO_RW))) {
+        if (!(rw & REQ_WRITE)) {
                 if (bio_flags & EXTENT_BIO_COMPRESSED) {
                         return btrfs_submit_compressed_read(inode, bio,
                                                     mirror_num, bio_flags);
@@ -1841,7 +1841,7 @@ static int btrfs_io_failed_hook(struct bio *failed_bio,
         bio->bi_size = 0;
 
         bio_add_page(bio, page, failrec->len, start - page_offset(page));
-        if (failed_bio->bi_rw & (1 << BIO_RW))
+        if (failed_bio->bi_rw & REQ_WRITE)
                 rw = WRITE;
         else
                 rw = READ;
@@ -2938,7 +2938,6 @@ int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
         ret = btrfs_update_inode(trans, root, dir);
         BUG_ON(ret);
-        dir->i_sb->s_dirt = 1;
 
         btrfs_free_path(path);
         return 0;
@@ -3656,17 +3655,19 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
                 if (err)
                         return err;
         }
-        attr->ia_valid &= ~ATTR_SIZE;
 
-        if (attr->ia_valid)
-                err = inode_setattr(inode, attr);
+        if (attr->ia_valid) {
+                setattr_copy(inode, attr);
+                mark_inode_dirty(inode);
+
+                if (attr->ia_valid & ATTR_MODE)
+                        err = btrfs_acl_chmod(inode);
+        }
 
-        if (!err && ((attr->ia_valid & ATTR_MODE)))
-                err = btrfs_acl_chmod(inode);
         return err;
 }
 
-void btrfs_delete_inode(struct inode *inode)
+void btrfs_evict_inode(struct inode *inode)
 {
         struct btrfs_trans_handle *trans;
         struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -3674,10 +3675,14 @@ void btrfs_delete_inode(struct inode *inode)
         int ret;
 
         truncate_inode_pages(&inode->i_data, 0);
+        if (inode->i_nlink && btrfs_root_refs(&root->root_item) != 0)
+                goto no_delete;
+
         if (is_bad_inode(inode)) {
                 btrfs_orphan_del(NULL, inode);
                 goto no_delete;
         }
+        /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */
         btrfs_wait_ordered_range(inode, 0, (u64)-1);
 
         if (root->fs_info->log_root_recovering) {
@@ -3727,7 +3732,7 @@ void btrfs_delete_inode(struct inode *inode)
         btrfs_end_transaction(trans, root);
         btrfs_btree_balance_dirty(root, nr);
 no_delete:
-        clear_inode(inode);
+        end_writeback(inode);
         return;
 }
 
@@ -3844,7 +3849,7 @@ again:
         p = &root->inode_tree.rb_node;
         parent = NULL;
 
-        if (hlist_unhashed(&inode->i_hash))
+        if (inode_unhashed(inode))
                 return;
 
         spin_lock(&root->inode_lock);
@@ -3858,7 +3863,7 @@ again:
                         p = &parent->rb_right;
                 else {
                         WARN_ON(!(entry->vfs_inode.i_state &
-                                  (I_WILL_FREE | I_FREEING | I_CLEAR)));
+                                  (I_WILL_FREE | I_FREEING)));
                         rb_erase(parent, &root->inode_tree);
                         RB_CLEAR_NODE(parent);
                         spin_unlock(&root->inode_lock);
@@ -3937,7 +3942,7 @@ again:
                         if (atomic_read(&inode->i_count) > 1)
                                 d_prune_aliases(inode);
                         /*
-                         * btrfs_drop_inode will remove it from
+                         * btrfs_drop_inode will have it removed from
                          * the inode cache when its usage count
                          * hits zero.
                          */
@@ -4753,7 +4758,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
         }
 
         btrfs_set_trans_block_group(trans, dir);
-        atomic_inc(&inode->i_count);
+        ihold(inode);
 
         err = btrfs_add_nondir(trans, dentry, inode, 1, index);
 
@@ -5642,7 +5647,7 @@ static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
         struct bio_vec *bvec = bio->bi_io_vec;
         u64 start;
         int skip_sum;
-        int write = rw & (1 << BIO_RW);
+        int write = rw & REQ_WRITE;
         int ret = 0;
 
         skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
@@ -6331,13 +6336,14 @@ free:
         kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
 }
 
-void btrfs_drop_inode(struct inode *inode)
+int btrfs_drop_inode(struct inode *inode)
 {
         struct btrfs_root *root = BTRFS_I(inode)->root;
-        if (inode->i_nlink > 0 && btrfs_root_refs(&root->root_item) == 0)
-                generic_delete_inode(inode);
+
+        if (btrfs_root_refs(&root->root_item) == 0)
+                return 1;
         else
-                generic_drop_inode(inode);
+                return generic_drop_inode(inode);
 }
 
 static void init_once(void *foo)
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index f2393b390318..144f8a5730f5 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -797,7 +797,7 @@ static int btrfs_unfreeze(struct super_block *sb)
 
 static const struct super_operations btrfs_super_ops = {
         .drop_inode     = btrfs_drop_inode,
-        .delete_inode   = btrfs_delete_inode,
+        .evict_inode    = btrfs_evict_inode,
         .put_super      = btrfs_put_super,
         .sync_fs        = btrfs_sync_fs,
         .show_options   = btrfs_show_options,
@@ -815,6 +815,7 @@ static const struct file_operations btrfs_ctl_fops = {
         .unlocked_ioctl  = btrfs_control_ioctl,
         .compat_ioctl = btrfs_control_ioctl,
         .owner   = THIS_MODULE,
+        .llseek = noop_llseek,
 };
 
 static struct miscdevice btrfs_misc = {
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d6e3af8be95b..e25e46a8b4e2 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -258,7 +258,7 @@ loop_lock:
 
                 BUG_ON(atomic_read(&cur->bi_cnt) == 0);
 
-                if (bio_rw_flagged(cur, BIO_RW_SYNCIO))
+                if (cur->bi_rw & REQ_SYNC)
                         num_sync_run++;
 
                 submit_bio(cur->bi_rw, cur);
@@ -398,7 +398,6 @@ static noinline int device_list_add(const char *path,
                 device->work.func = pending_bios_fn;
                 memcpy(device->uuid, disk_super->dev_item.uuid,
                        BTRFS_UUID_SIZE);
-                device->barriers = 1;
                 spin_lock_init(&device->io_lock);
                 device->name = kstrdup(path, GFP_NOFS);
                 if (!device->name) {
@@ -462,7 +461,6 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
                 device->devid = orig_dev->devid;
                 device->work.func = pending_bios_fn;
                 memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid));
-                device->barriers = 1;
                 spin_lock_init(&device->io_lock);
                 INIT_LIST_HEAD(&device->dev_list);
                 INIT_LIST_HEAD(&device->dev_alloc_list);
@@ -1489,7 +1487,6 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
         trans = btrfs_start_transaction(root, 0);
         lock_chunks(root);
 
-        device->barriers = 1;
         device->writeable = 1;
         device->work.func = pending_bios_fn;
         generate_random_uuid(device->uuid);
@@ -2651,7 +2648,7 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
         int max_errors = 0;
         struct btrfs_multi_bio *multi = NULL;
 
-        if (multi_ret && !(rw & (1 << BIO_RW)))
+        if (multi_ret && !(rw & REQ_WRITE))
                 stripes_allocated = 1;
 again:
         if (multi_ret) {
@@ -2687,7 +2684,7 @@ again:
                 mirror_num = 0;
 
         /* if our multi bio struct is too small, back off and try again */
-        if (rw & (1 << BIO_RW)) {
+        if (rw & REQ_WRITE) {
                 if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
                                  BTRFS_BLOCK_GROUP_DUP)) {
                         stripes_required = map->num_stripes;
@@ -2697,7 +2694,7 @@ again:
                         max_errors = 1;
                 }
         }
-        if (multi_ret && (rw & (1 << BIO_RW)) &&
+        if (multi_ret && (rw & REQ_WRITE) &&
             stripes_allocated < stripes_required) {
                 stripes_allocated = map->num_stripes;
                 free_extent_map(em);
@@ -2733,7 +2730,7 @@ again:
         num_stripes = 1;
         stripe_index = 0;
         if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
-                if (unplug_page || (rw & (1 << BIO_RW)))
+                if (unplug_page || (rw & REQ_WRITE))
                         num_stripes = map->num_stripes;
                 else if (mirror_num)
                         stripe_index = mirror_num - 1;
@@ -2744,7 +2741,7 @@ again:
                 }
 
         } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
-                if (rw & (1 << BIO_RW))
+                if (rw & REQ_WRITE)
                         num_stripes = map->num_stripes;
                 else if (mirror_num)
                         stripe_index = mirror_num - 1;
@@ -2755,7 +2752,7 @@ again:
                 stripe_index = do_div(stripe_nr, factor);
                 stripe_index *= map->sub_stripes;
 
-                if (unplug_page || (rw & (1 << BIO_RW)))
+                if (unplug_page || (rw & REQ_WRITE))
                         num_stripes = map->sub_stripes;
                 else if (mirror_num)
                         stripe_index += mirror_num - 1;
@@ -2945,7 +2942,7 @@ static noinline int schedule_bio(struct btrfs_root *root,
         struct btrfs_pending_bios *pending_bios;
 
         /* don't bother with additional async steps for reads, right now */
-        if (!(rw & (1 << BIO_RW))) {
+        if (!(rw & REQ_WRITE)) {
                 bio_get(bio);
                 submit_bio(rw, bio);
                 bio_put(bio);
@@ -2964,7 +2961,7 @@ static noinline int schedule_bio(struct btrfs_root *root,
         bio->bi_rw |= rw;
 
         spin_lock(&device->io_lock);
-        if (bio_rw_flagged(bio, BIO_RW_SYNCIO))
+        if (bio->bi_rw & REQ_SYNC)
                 pending_bios = &device->pending_sync_bios;
         else
                 pending_bios = &device->pending_bios;
@@ -3084,7 +3081,6 @@ static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
                 return NULL;
         list_add(&device->dev_list,
                  &fs_devices->devices);
-        device->barriers = 1;
         device->dev_root = root->fs_info->dev_root;
         device->devid = devid;
         device->work.func = pending_bios_fn;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 31b0fabdd2ea..2b638b6e4eea 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -42,7 +42,6 @@ struct btrfs_device {
         int running_pending;
         u64 generation;
 
-        int barriers;
         int writeable;
         int in_fs_metadata;