X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=extent_io.c;h=198492699438f06a4e8bee5c7a39965a55c484d0;hb=1028857cb48f2b25d92495eafa24b308bc430054;hp=377dec09038aed018fc13d72fb0d559a67fc0bb3;hpb=17793e3e6a49946d70fd6e3291f6c422bb7f69c4;p=platform%2Fupstream%2Fbtrfs-progs.git

diff --git a/extent_io.c b/extent_io.c
index 377dec0..1984926 100644
--- a/extent_io.c
+++ b/extent_io.c
@@ -16,22 +16,20 @@
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 021110-1307, USA.
  */
-#define _XOPEN_SOURCE 600
-#define __USE_XOPEN2K
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <stdbool.h>
 #include "kerncompat.h"
 #include "extent_io.h"
 #include "list.h"
 #include "ctree.h"
 #include "volumes.h"
-
-u64 cache_soft_max = 1024 * 1024 * 256;
-u64 cache_hard_max = 1 * 1024 * 1024 * 1024;
+#include "utils.h"
+#include "internal.h"
 
 void extent_io_tree_init(struct extent_io_tree *tree)
 {
@@ -39,6 +37,14 @@ void extent_io_tree_init(struct extent_io_tree *tree)
 	cache_tree_init(&tree->cache);
 	INIT_LIST_HEAD(&tree->lru);
 	tree->cache_size = 0;
+	tree->max_cache_size = (u64)total_memory() / 4;
+}
+
+void extent_io_tree_init_cache_max(struct extent_io_tree *tree,
+				   u64 max_cache_size)
+{
+	extent_io_tree_init(tree);
+	tree->max_cache_size = max_cache_size;
 }
 
 static struct extent_state *alloc_extent_state(void)
@@ -71,19 +77,21 @@ static void free_extent_state_func(struct cache_extent *cache)
 	btrfs_free_extent_state(es);
 }
 
+static void free_extent_buffer_final(struct extent_buffer *eb);
 void extent_io_tree_cleanup(struct extent_io_tree *tree)
 {
 	struct extent_buffer *eb;
 
 	while(!list_empty(&tree->lru)) {
 		eb = list_entry(tree->lru.next, struct extent_buffer, lru);
-		if (eb->refs != 1) {
-			fprintf(stderr, "extent buffer leak: "
-				"start %llu len %u\n",
+		if (eb->refs) {
+			fprintf(stderr,
+				"extent buffer leak: start %llu len %u\n",
 				(unsigned long long)eb->start, eb->len);
-			eb->refs = 1;
+			free_extent_buffer_nocache(eb);
+		} else {
+			free_extent_buffer_final(eb);
 		}
-		free_extent_buffer(eb);
 	}
 
 	cache_tree_free_extents(&tree->state, free_extent_state_func);
@@ -197,10 +205,9 @@ static int clear_state_bit(struct extent_io_tree *tree,
 }
 
 /*
- * set some bits on a range in the tree.
+ * clear some bits on a range in the tree.
  */
-int clear_extent_bits(struct extent_io_tree *tree, u64 start,
-		      u64 end, int bits, gfp_t mask)
+int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
 {
 	struct extent_state *state;
 	struct extent_state *prealloc = NULL;
@@ -210,9 +217,11 @@ int clear_extent_bits(struct extent_io_tree *tree, u64 start,
 	int set = 0;
 
 again:
-	prealloc = alloc_extent_state();
-	if (!prealloc)
-		return -ENOMEM;
+	if (!prealloc) {
+		prealloc = alloc_extent_state();
+		if (!prealloc)
+			return -ENOMEM;
+	}
 
 	/*
 	 * this search will find the extents that end after
@@ -292,8 +301,7 @@ search_again:
 /*
  * set some bits on a range in the tree.
  */
-int set_extent_bits(struct extent_io_tree *tree, u64 start,
-		    u64 end, int bits, gfp_t mask)
+int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
 {
 	struct extent_state *state;
 	struct extent_state *prealloc = NULL;
@@ -416,16 +424,14 @@ search_again:
 	goto again;
 }
 
-int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
-		     gfp_t mask)
+int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
 {
-	return set_extent_bits(tree, start, end, EXTENT_DIRTY, mask);
+	return set_extent_bits(tree, start, end, EXTENT_DIRTY);
 }
 
-int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
-		       gfp_t mask)
+int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
 {
-	return clear_extent_bits(tree, start, end, EXTENT_DIRTY, mask);
+	return clear_extent_bits(tree, start, end, EXTENT_DIRTY);
 }
 
 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
@@ -539,82 +545,86 @@ out:
 	return ret;
 }
 
-static int free_some_buffers(struct extent_io_tree *tree)
-{
-	u32 nrscan = 0;
-	struct extent_buffer *eb;
-	struct list_head *node, *next;
-
-	if (tree->cache_size < cache_soft_max)
-		return 0;
-
-	list_for_each_safe(node, next, &tree->lru) {
-		eb = list_entry(node, struct extent_buffer, lru);
-		if (eb->refs == 1) {
-			free_extent_buffer(eb);
-			if (tree->cache_size < cache_hard_max)
-				break;
-		} else {
-			list_move_tail(&eb->lru, &tree->lru);
-		}
-		if (nrscan++ > 64 && tree->cache_size < cache_hard_max)
-			break;
-	}
-	return 0;
-}
-
-static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
+static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *info,
 						   u64 bytenr, u32 blocksize)
 {
 	struct extent_buffer *eb;
-	int ret;
 
-	eb = malloc(sizeof(struct extent_buffer) + blocksize);
-	if (!eb) {
-		BUG();
+	eb = calloc(1, sizeof(struct extent_buffer) + blocksize);
+	if (!eb)
 		return NULL;
-	}
-	memset(eb, 0, sizeof(struct extent_buffer) + blocksize);
 
 	eb->start = bytenr;
 	eb->len = blocksize;
-	eb->refs = 2;
+	eb->refs = 1;
 	eb->flags = 0;
-	eb->tree = tree;
 	eb->fd = -1;
 	eb->dev_bytenr = (u64)-1;
 	eb->cache_node.start = bytenr;
 	eb->cache_node.size = blocksize;
+	eb->fs_info = info;
+	eb->tree = &info->extent_cache;
+	INIT_LIST_HEAD(&eb->recow);
+	INIT_LIST_HEAD(&eb->lru);
+
+	return eb;
+}
 
-	free_some_buffers(tree);
-	ret = insert_cache_extent(&tree->cache, &eb->cache_node);
-	if (ret) {
-		free(eb);
+struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
+{
+	struct extent_buffer *new;
+
+	new = __alloc_extent_buffer(src->fs_info, src->start, src->len);
+	if (!new)
 		return NULL;
+	/* cloned eb is not linked into fs_info->extent_cache */
+	new->tree = NULL;
+
+	copy_extent_buffer(new, src, 0, 0, src->len);
+	new->flags |= EXTENT_BUFFER_DUMMY;
+
+	return new;
+}
+
+static void free_extent_buffer_final(struct extent_buffer *eb)
+{
+	struct extent_io_tree *tree = eb->tree;
+
+	BUG_ON(eb->refs);
+	BUG_ON(tree && tree->cache_size < eb->len);
+	list_del_init(&eb->lru);
+	if (!(eb->flags & EXTENT_BUFFER_DUMMY)) {
+		remove_cache_extent(&tree->cache, &eb->cache_node);
+		tree->cache_size -= eb->len;
 	}
-	list_add_tail(&eb->lru, &tree->lru);
-	tree->cache_size += blocksize;
-	return eb;
+	free(eb);
 }
 
-void free_extent_buffer(struct extent_buffer *eb)
+static void free_extent_buffer_internal(struct extent_buffer *eb, bool free_now)
 {
-	if (!eb)
+	if (!eb || IS_ERR(eb))
 		return;
 
 	eb->refs--;
 	BUG_ON(eb->refs < 0);
 	if (eb->refs == 0) {
-		struct extent_io_tree *tree = eb->tree;
 		BUG_ON(eb->flags & EXTENT_DIRTY);
-		list_del_init(&eb->lru);
-		remove_cache_extent(&tree->cache, &eb->cache_node);
-		BUG_ON(tree->cache_size < eb->len);
-		tree->cache_size -= eb->len;
-		free(eb);
+		list_del_init(&eb->recow);
+		if (eb->flags & EXTENT_BUFFER_DUMMY || free_now)
+			free_extent_buffer_final(eb);
 	}
 }
 
+void free_extent_buffer(struct extent_buffer *eb)
+{
+	free_extent_buffer_internal(eb, 0);
+}
+
+void free_extent_buffer_nocache(struct extent_buffer *eb)
+{
+	free_extent_buffer_internal(eb, 1);
+}
+
 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 					 u64 bytenr, u32 blocksize)
 {
@@ -646,10 +656,23 @@ struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
 	return eb;
 }
 
-struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
+static void trim_extent_buffer_cache(struct extent_io_tree *tree)
+{
+	struct extent_buffer *eb, *tmp;
+
+	list_for_each_entry_safe(eb, tmp, &tree->lru, lru) {
+		if (eb->refs == 0)
+			free_extent_buffer_final(eb);
+		if (tree->cache_size <= ((tree->max_cache_size * 9) / 10))
+			break;
+	}
+}
+
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 					  u64 bytenr, u32 blocksize)
 {
 	struct extent_buffer *eb;
+	struct extent_io_tree *tree = &fs_info->extent_cache;
 	struct cache_extent *cache;
 
 	cache = lookup_cache_extent(&tree->cache, bytenr, blocksize);
@@ -659,12 +682,25 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 		list_move_tail(&eb->lru, &tree->lru);
 		eb->refs++;
 	} else {
+		int ret;
+
 		if (cache) {
 			eb = container_of(cache, struct extent_buffer,
 					  cache_node);
 			free_extent_buffer(eb);
 		}
-		eb = __alloc_extent_buffer(tree, bytenr, blocksize);
+		eb = __alloc_extent_buffer(fs_info, bytenr, blocksize);
+		if (!eb)
+			return NULL;
+		ret = insert_cache_extent(&tree->cache, &eb->cache_node);
+		if (ret) {
+			free(eb);
+			return NULL;
+		}
+		list_add_tail(&eb->lru, &tree->lru);
+		tree->cache_size += blocksize;
+		if (tree->cache_size >= tree->max_cache_size)
+			trim_extent_buffer_cache(tree);
 	}
 	return eb;
 }
@@ -674,8 +710,10 @@ int read_extent_from_disk(struct extent_buffer *eb,
 {
 	int ret;
 	ret = pread(eb->fd, eb->data + offset, len, eb->dev_bytenr);
-	if (ret < 0)
+	if (ret < 0) {
+		ret = -errno;
 		goto out;
+	}
 	if (ret != len) {
 		ret = -EIO;
 		goto out;
@@ -712,8 +750,8 @@ int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
 
 	while (bytes_left) {
 		read_len = bytes_left;
-		ret = btrfs_map_block(&info->mapping_tree, READ, offset,
-				      &read_len, &multi, mirror, NULL);
+		ret = btrfs_map_block(info, READ, offset, &read_len, &multi,
+				      mirror, NULL);
 		if (ret) {
 			fprintf(stderr, "Couldn't map the block %Lu\n",
 				offset);
@@ -722,7 +760,7 @@ int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
 		device = multi->stripes[0].dev;
 
 		read_len = min(bytes_left, read_len);
-		if (device->fd == 0) {
+		if (device->fd <= 0) {
 			kfree(multi);
 			return -EIO;
 		}
@@ -749,27 +787,98 @@ int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
 	return 0;
 }
 
-int set_extent_buffer_uptodate(struct extent_buffer *eb)
+int write_data_to_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
+		      u64 bytes, int mirror)
 {
-	eb->flags |= EXTENT_UPTODATE;
-	return 0;
-}
+	struct btrfs_multi_bio *multi = NULL;
+	struct btrfs_device *device;
+	u64 bytes_left = bytes;
+	u64 this_len;
+	u64 total_write = 0;
+	u64 *raid_map = NULL;
+	u64 dev_bytenr;
+	int dev_nr;
+	int ret = 0;
 
-int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
-				struct extent_buffer *eb)
-{
-	eb->flags &= ~EXTENT_UPTODATE;
-	return 0;
-}
+	while (bytes_left > 0) {
+		this_len = bytes_left;
+		dev_nr = 0;
 
-int extent_buffer_uptodate(struct extent_buffer *eb)
-{
-	if (!eb)
-		return 0;
+		ret = btrfs_map_block(info, WRITE, offset, &this_len, &multi,
+				      mirror, &raid_map);
+		if (ret) {
+			fprintf(stderr, "Couldn't map the block %Lu\n",
+				offset);
+			return -EIO;
+		}
+
+		if (raid_map) {
+			struct extent_buffer *eb;
+			u64 stripe_len = this_len;
+
+			this_len = min(this_len, bytes_left);
+			this_len = min(this_len, (u64)info->nodesize);
+
+			eb = malloc(sizeof(struct extent_buffer) + this_len);
+			if (!eb) {
+				fprintf(stderr, "cannot allocate memory for eb\n");
+				ret = -ENOMEM;
+				goto out;
+			}
+
+			memset(eb, 0, sizeof(struct extent_buffer) + this_len);
+			eb->start = offset;
+			eb->len = this_len;
+
+			memcpy(eb->data, buf + total_write, this_len);
+			ret = write_raid56_with_parity(info, eb, multi,
+						       stripe_len, raid_map);
+			BUG_ON(ret);
+
+			free(eb);
+			kfree(raid_map);
+			raid_map = NULL;
+		} else while (dev_nr < multi->num_stripes) {
+			device = multi->stripes[dev_nr].dev;
+			if (device->fd <= 0) {
+				kfree(multi);
+				return -EIO;
+			}
+
+			dev_bytenr = multi->stripes[dev_nr].physical;
+			this_len = min(this_len, bytes_left);
+			dev_nr++;
+
+			ret = pwrite(device->fd, buf + total_write, this_len, dev_bytenr);
+			if (ret != this_len) {
+				if (ret < 0) {
+					fprintf(stderr, "Error writing to "
+						"device %d\n", errno);
+					ret = errno;
+					kfree(multi);
+					return ret;
+				} else {
+					fprintf(stderr, "Short write\n");
+					kfree(multi);
+					return -EIO;
+				}
+			}
+		}
+
+		BUG_ON(bytes_left < this_len);
 
-	if (eb->flags & EXTENT_UPTODATE)
-		return 1;
+		bytes_left -= this_len;
+		offset += this_len;
+		total_write += this_len;
+
+		kfree(multi);
+		multi = NULL;
+	}
 	return 0;
+
+out:
+	kfree(raid_map);
+	return ret;
 }
 
 int set_extent_buffer_dirty(struct extent_buffer *eb)
@@ -777,7 +886,7 @@ int set_extent_buffer_dirty(struct extent_buffer *eb)
 	struct extent_io_tree *tree = eb->tree;
 	if (!(eb->flags & EXTENT_DIRTY)) {
 		eb->flags |= EXTENT_DIRTY;
-		set_extent_dirty(tree, eb->start, eb->start + eb->len - 1, 0);
+		set_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
 		extent_buffer_get(eb);
 	}
 	return 0;
@@ -788,7 +897,7 @@ int clear_extent_buffer_dirty(struct extent_buffer *eb)
 	struct extent_io_tree *tree = eb->tree;
 	if (eb->flags & EXTENT_DIRTY) {
 		eb->flags &= ~EXTENT_DIRTY;
-		clear_extent_dirty(tree, eb->start, eb->start + eb->len - 1, 0);
+		clear_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
 		free_extent_buffer(eb);
 	}
 	return 0;
@@ -819,12 +928,6 @@ void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 	memcpy(dst->data + dst_offset, src->data + src_offset, len);
 }
 
-void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
-			  unsigned long src_offset, unsigned long len)
-{
-	memcpy(dst->data + dst_offset, dst->data + src_offset, len);
-}
-
 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 			   unsigned long src_offset, unsigned long len)
 {
@@ -836,3 +939,9 @@ void memset_extent_buffer(struct extent_buffer *eb, char c,
 {
 	memset(eb->data + start, c, len);
 }
+
+int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
+			   unsigned long nr)
+{
+	return le_test_bit(nr, (u8 *)eb->data + start);
+}