X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;ds=sidebyside;f=fs%2Fbtrfs%2Ffile-item.c;h=9b99886562d0b2c8ea9e883f3f2623b0ec6d8674;hb=3daeb42c13567e1505f233f6a699cc0e23c8ab5a;hp=b11abfad81a5bb8f8634c2d347d6441aae6cdfb0;hpb=d397712bcc6a759a560fd247e6053ecae091f958;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index b11abfa..9b99886 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -27,6 +27,12 @@
 #define MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
 				   sizeof(struct btrfs_item) * 2) / \
 				  size) - 1))
+
+#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
+				   sizeof(struct btrfs_ordered_sum)) / \
+				   sizeof(struct btrfs_sector_sum) * \
+				   (r)->sectorsize - (r)->sectorsize)
+
 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *root,
 			     u64 objectid, u64 pos,
@@ -46,6 +52,7 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
 	file_key.offset = pos;
 	btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
 
+	path->leave_spinning = 1;
 	ret = btrfs_insert_empty_item(trans, root, path, &file_key,
 				      sizeof(*item));
 	if (ret < 0)
@@ -259,8 +266,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
 	key.offset = start;
 	key.type = BTRFS_EXTENT_CSUM_KEY;
 
-	ret = btrfs_search_slot(NULL, root->fs_info->csum_root,
-				&key, path, 0, 0);
+	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
 	if (ret < 0)
 		goto fail;
 	if (ret > 0 && path->slots[0] > 0) {
@@ -279,7 +285,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
 	while (start <= end) {
 		leaf = path->nodes[0];
 		if (path->slots[0] >= btrfs_header_nritems(leaf)) {
-			ret = btrfs_next_leaf(root->fs_info->csum_root, path);
+			ret = btrfs_next_leaf(root, path);
 			if (ret < 0)
 				goto fail;
 			if (ret > 0)
@@ -306,33 +312,38 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
 			continue;
 		}
 
-		size = min(csum_end, end + 1) - start;
-		sums = kzalloc(btrfs_ordered_sum_size(root, size), GFP_NOFS);
-		BUG_ON(!sums);
+		csum_end = min(csum_end, end + 1);
+		item = btrfs_item_ptr(path->nodes[0], path->slots[0],
+				      struct btrfs_csum_item);
+		while (start < csum_end) {
+			size = min_t(size_t, csum_end - start,
+					MAX_ORDERED_SUM_BYTES(root));
+			sums = kzalloc(btrfs_ordered_sum_size(root, size),
+					GFP_NOFS);
+			BUG_ON(!sums);
 
-		sector_sum = sums->sums;
-		sums->bytenr = start;
-		sums->len = size;
+			sector_sum = sums->sums;
+			sums->bytenr = start;
+			sums->len = size;
 
-		offset = (start - key.offset) >>
-			 root->fs_info->sb->s_blocksize_bits;
-		offset *= csum_size;
+			offset = (start - key.offset) >>
+				root->fs_info->sb->s_blocksize_bits;
+			offset *= csum_size;
 
-		item = btrfs_item_ptr(path->nodes[0], path->slots[0],
-				      struct btrfs_csum_item);
-		while (size > 0) {
-			read_extent_buffer(path->nodes[0], &sector_sum->sum,
-					   ((unsigned long)item) + offset,
-					   csum_size);
-			sector_sum->bytenr = start;
-
-			size -= root->sectorsize;
-			start += root->sectorsize;
-			offset += csum_size;
-			sector_sum++;
+			while (size > 0) {
+				read_extent_buffer(path->nodes[0],
+						&sector_sum->sum,
+						((unsigned long)item) +
+						offset, csum_size);
+				sector_sum->bytenr = start;
+
+				size -= root->sectorsize;
+				start += root->sectorsize;
+				offset += csum_size;
+				sector_sum++;
+			}
+			list_add_tail(&sums->list, list);
 		}
-		list_add_tail(&sums->list, list);
-
 		path->slots[0]++;
 	}
 	ret = 0;
@@ -513,6 +524,7 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans,
 		key.offset = end_byte - 1;
 		key.type = BTRFS_EXTENT_CSUM_KEY;
 
+		path->leave_spinning = 1;
 		ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
 		if (ret > 0) {
 			if (path->slots[0] == 0)
@@ -747,8 +759,10 @@ insert:
 	} else {
 		ins_size = csum_size;
 	}
+	path->leave_spinning = 1;
 	ret = btrfs_insert_empty_item(trans, root, path, &file_key,
 				      ins_size);
+	path->leave_spinning = 0;
 	if (ret < 0)
 		goto fail_unlock;
 	if (ret != 0) {
@@ -766,7 +780,6 @@ found:
 	item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
 				      btrfs_item_size_nr(leaf, path->slots[0]));
 	eb_token = NULL;
-	cond_resched();
 next_sector:
 
 	if (!eb_token ||
@@ -807,9 +820,9 @@ next_sector:
 		eb_token = NULL;
 	}
 	btrfs_mark_buffer_dirty(path->nodes[0]);
-	cond_resched();
 	if (total_bytes < sums->len) {
 		btrfs_release_path(root, path);
+		cond_resched();
 		goto again;
 	}
 out: