Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: fix reservations in btrfs_page_mkwrite
  Btrfs: advance window_start if we're using a bitmap
  btrfs: mask out gfp flags in releasepage
  Btrfs: fix enospc error caused by wrong checks of the chunk
  Btrfs: do not defrag a file partially
  Btrfs: fix warning for 32-bit build of fs/btrfs/check-integrity.c
  Btrfs: use cluster->window_start when allocating from a cluster bitmap
  Btrfs: Check for NULL page in extent_range_uptodate
  btrfs: Fix busyloops in transaction waiting code
  Btrfs: make sure a bitmap has enough bytes
  Btrfs: fix uninit warning in backref.c

fs/btrfs/backref.c

@@ -297,7 +297,7 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
 	struct btrfs_delayed_extent_op *extent_op = head->extent_op;
 	struct rb_node *n = &head->node.rb_node;
 	int sgn;
-	int ret;
+	int ret = 0;
 
 	if (extent_op && extent_op->update_key)
 		btrfs_disk_key_to_cpu(info_key, &extent_op->key);
@@ -392,7 +392,7 @@ static int __add_inline_refs(struct btrfs_fs_info *fs_info,
 			     struct btrfs_key *info_key, int *info_level,
 			     struct list_head *prefs)
 {
-	int ret;
+	int ret = 0;
 	int slot;
 	struct extent_buffer *leaf;
 	struct btrfs_key key;

fs/btrfs/check-integrity.c

@@ -1662,7 +1662,7 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
 	block = btrfsic_block_hashtable_lookup(bdev, dev_bytenr,
 					       &state->block_hashtable);
 	if (NULL != block) {
-		u64 bytenr;
+		u64 bytenr = 0;
 		struct list_head *elem_ref_to;
 		struct list_head *tmp_ref_to;
 
@@ -2777,9 +2777,10 @@ int btrfsic_submit_bh(int rw, struct buffer_head *bh)
 			printk(KERN_INFO
 			       "submit_bh(rw=0x%x, blocknr=%lu (bytenr %llu),"
 			       " size=%lu, data=%p, bdev=%p)\n",
-			       rw, bh->b_blocknr,
-			       (unsigned long long)dev_bytenr, bh->b_size,
-			       bh->b_data, bh->b_bdev);
+			       rw, (unsigned long)bh->b_blocknr,
+			       (unsigned long long)dev_bytenr,
+			       (unsigned long)bh->b_size, bh->b_data,
+			       bh->b_bdev);
 		btrfsic_process_written_block(dev_state, dev_bytenr,
 					      bh->b_data, bh->b_size, NULL,
 					      NULL, bh, rw);
@@ -2844,7 +2845,7 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
 			printk(KERN_INFO
 			       "submit_bio(rw=0x%x, bi_vcnt=%u,"
 			       " bi_sector=%lu (bytenr %llu), bi_bdev=%p)\n",
-			       rw, bio->bi_vcnt, bio->bi_sector,
+			       rw, bio->bi_vcnt, (unsigned long)bio->bi_sector,
 			       (unsigned long long)dev_bytenr,
 			       bio->bi_bdev);
 

fs/btrfs/disk-io.c

@@ -962,6 +962,13 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags)
 	tree = &BTRFS_I(page->mapping->host)->io_tree;
 	map = &BTRFS_I(page->mapping->host)->extent_tree;
 
+	/*
+	 * We need to mask out eg. __GFP_HIGHMEM and __GFP_DMA32 as we're doing
+	 * slab allocation from alloc_extent_state down the callchain where
+	 * it'd hit a BUG_ON as those flags are not allowed.
+	 */
+	gfp_flags &= ~GFP_SLAB_BUG_MASK;
+
 	ret = try_release_extent_state(map, tree, page, gfp_flags);
 	if (!ret)
 		return 0;

fs/btrfs/extent-tree.c

@@ -34,23 +34,24 @@
 #include "locking.h"
 #include "free-space-cache.h"
 
-/* control flags for do_chunk_alloc's force field
+/*
+ * control flags for do_chunk_alloc's force field
  * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk
  * if we really need one.
  *
- * CHUNK_ALLOC_FORCE means it must try to allocate one
- *
  * CHUNK_ALLOC_LIMITED means to only try and allocate one
  * if we have very few chunks already allocated.  This is
  * used as part of the clustering code to help make sure
  * we have a good pool of storage to cluster in, without
  * filling the FS with empty chunks
  *
+ * CHUNK_ALLOC_FORCE means it must try to allocate one
+ *
  */
 enum {
 	CHUNK_ALLOC_NO_FORCE = 0,
-	CHUNK_ALLOC_FORCE = 1,
-	CHUNK_ALLOC_LIMITED = 2,
+	CHUNK_ALLOC_LIMITED = 1,
+	CHUNK_ALLOC_FORCE = 2,
 };
 
 /*
@@ -3414,7 +3415,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
 
 again:
 	spin_lock(&space_info->lock);
-	if (space_info->force_alloc)
+	if (force < space_info->force_alloc)
 		force = space_info->force_alloc;
 	if (space_info->full) {
 		spin_unlock(&space_info->lock);
@@ -5794,6 +5795,7 @@ int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
 			 u64 search_end, struct btrfs_key *ins,
 			 u64 data)
 {
+	bool final_tried = false;
 	int ret;
 	u64 search_start = 0;
 
@@ -5813,22 +5815,25 @@ again:
 			       search_start, search_end, hint_byte,
 			       ins, data);
 
-	if (ret == -ENOSPC && num_bytes > min_alloc_size) {
-		num_bytes = num_bytes >> 1;
-		num_bytes = num_bytes & ~(root->sectorsize - 1);
-		num_bytes = max(num_bytes, min_alloc_size);
-		do_chunk_alloc(trans, root->fs_info->extent_root,
-			       num_bytes, data, CHUNK_ALLOC_FORCE);
-		goto again;
-	}
-	if (ret == -ENOSPC && btrfs_test_opt(root, ENOSPC_DEBUG)) {
-		struct btrfs_space_info *sinfo;
+	if (ret == -ENOSPC) {
+		if (!final_tried) {
+			num_bytes = num_bytes >> 1;
+			num_bytes = num_bytes & ~(root->sectorsize - 1);
+			num_bytes = max(num_bytes, min_alloc_size);
+			do_chunk_alloc(trans, root->fs_info->extent_root,
+				       num_bytes, data, CHUNK_ALLOC_FORCE);
+			if (num_bytes == min_alloc_size)
+				final_tried = true;
+			goto again;
+		} else if (btrfs_test_opt(root, ENOSPC_DEBUG)) {
+			struct btrfs_space_info *sinfo;
 
-		sinfo = __find_space_info(root->fs_info, data);
-		printk(KERN_ERR "btrfs allocation failed flags %llu, "
-		       "wanted %llu\n", (unsigned long long)data,
-		       (unsigned long long)num_bytes);
-		dump_space_info(sinfo, num_bytes, 1);
+			sinfo = __find_space_info(root->fs_info, data);
+			printk(KERN_ERR "btrfs allocation failed flags %llu, "
+			       "wanted %llu\n", (unsigned long long)data,
+			       (unsigned long long)num_bytes);
+			dump_space_info(sinfo, num_bytes, 1);
+		}
 	}
 
 	trace_btrfs_reserved_extent_alloc(root, ins->objectid, ins->offset);

fs/btrfs/extent_io.c

@@ -3909,6 +3909,8 @@ int extent_range_uptodate(struct extent_io_tree *tree,
 	while (start <= end) {
 		index = start >> PAGE_CACHE_SHIFT;
 		page = find_get_page(tree->mapping, index);
+		if (!page)
+			return 1;
 		uptodate = PageUptodate(page);
 		page_cache_release(page);
 		if (!uptodate) {

fs/btrfs/free-space-cache.c

@@ -2242,7 +2242,7 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
 		if (entry->bitmap) {
 			ret = btrfs_alloc_from_bitmap(block_group,
 						      cluster, entry, bytes,
-						      min_start);
+						      cluster->window_start);
 			if (ret == 0) {
 				node = rb_next(&entry->offset_index);
 				if (!node)
@@ -2251,6 +2251,7 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
 						 offset_index);
 				continue;
 			}
+			cluster->window_start += bytes;
 		} else {
 			ret = entry->offset;
 
@@ -2475,7 +2476,7 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
 	}
 
 	list_for_each_entry(entry, bitmaps, list) {
-		if (entry->bytes < min_bytes)
+		if (entry->bytes < bytes)
 			continue;
 		ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset,
 					   bytes, cont1_bytes, min_bytes);

fs/btrfs/inode.c

@@ -6401,18 +6401,23 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 	unsigned long zero_start;
 	loff_t size;
 	int ret;
+	int reserved = 0;
 	u64 page_start;
 	u64 page_end;
 
 	ret  = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
-	if (!ret)
+	if (!ret) {
 		ret = btrfs_update_time(vma->vm_file);
+		reserved = 1;
+	}
 	if (ret) {
 		if (ret == -ENOMEM)
 			ret = VM_FAULT_OOM;
 		else /* -ENOSPC, -EIO, etc */
 			ret = VM_FAULT_SIGBUS;
-		goto out;
+		if (reserved)
+			goto out;
+		goto out_noreserve;
 	}
 
 	ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
@@ -6495,6 +6500,7 @@ out_unlock:
 	unlock_page(page);
 out:
 	btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
+out_noreserve:
 	return ret;
 }
 

fs/btrfs/ioctl.c

@@ -1065,7 +1065,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 		i = range->start >> PAGE_CACHE_SHIFT;
 	}
 	if (!max_to_defrag)
-		max_to_defrag = last_index;
+		max_to_defrag = last_index + 1;
 
 	/*
 	 * make writeback starts from i, so the defrag range can be

fs/btrfs/tree-log.c

@@ -1957,7 +1957,8 @@ static int wait_log_commit(struct btrfs_trans_handle *trans,
 
 		finish_wait(&root->log_commit_wait[index], &wait);
 		mutex_lock(&root->log_mutex);
-	} while (root->log_transid < transid + 2 &&
+	} while (root->fs_info->last_trans_log_full_commit !=
+		 trans->transid && root->log_transid < transid + 2 &&
 		 atomic_read(&root->log_commit[index]));
 	return 0;
 }
@@ -1966,7 +1967,8 @@ static int wait_for_writer(struct btrfs_trans_handle *trans,
 			   struct btrfs_root *root)
 {
 	DEFINE_WAIT(wait);
-	while (atomic_read(&root->log_writers)) {
+	while (root->fs_info->last_trans_log_full_commit !=
+	       trans->transid && atomic_read(&root->log_writers)) {
 		prepare_to_wait(&root->log_writer_wait,
 				&wait, TASK_UNINTERRUPTIBLE);
 		mutex_unlock(&root->log_mutex);