X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=inode.c;h=2398bca4a1096bb20cf4d8cf632b99e8b527c66c;hb=feccd7a8180f3f0f48ca23692ad5f71783163450;hp=be03a52297a71c308a729ad5d6f41720b2c12213;hpb=fe283a4fc32e28c9f83d5e9faec4b8f8375daeb0;p=platform%2Fupstream%2Fbtrfs-progs.git

diff --git a/inode.c b/inode.c
index be03a52..2398bca 100644
--- a/inode.c
+++ b/inode.c
@@ -20,7 +20,7 @@
  * Unlike inode.c in kernel, which can use most of the kernel infrastructure
  * like inode/dentry things, in user-land, we can only use inode number to
  * do directly operation on extent buffer, which may cause extra searching,
- * but should not be a huge problem since progs is less performence sensitive.
+ * but should not be a huge problem since progs is less performance sensitive.
  */
 #include <sys/stat.h>
 
@@ -28,6 +28,7 @@
 #include "transaction.h"
 #include "disk-io.h"
 #include "time.h"
+#include "messages.h"
 
 /*
  * Find a free inode index for later btrfs_add_link().
@@ -161,7 +162,7 @@ out:
  */
 int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		   u64 ino, u64 parent_ino, char *name, int namelen,
-		   u8 type, u64 *index, int add_backref)
+		   u8 type, u64 *index, int add_backref, int ignore_existed)
 {
 	struct btrfs_path *path;
 	struct btrfs_key key;
@@ -184,33 +185,37 @@ int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	}
 
 	ret = check_dir_conflict(root, name, namelen, parent_ino, ret_index);
-	if (ret < 0)
+	if (ret < 0 && !(ignore_existed && ret == -EEXIST))
 		goto out;
 
 	/* Add inode ref */
 	if (add_backref) {
 		ret = btrfs_insert_inode_ref(trans, root, name, namelen,
 					     ino, parent_ino, ret_index);
-		if (ret < 0)
+		if (ret < 0 && !(ignore_existed && ret == -EEXIST))
 			goto out;
 
-		/* Update nlinks for the inode */
-		key.objectid = ino;
-		key.type = BTRFS_INODE_ITEM_KEY;
-		key.offset = 0;
-		ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
-		if (ret) {
-			if (ret > 0)
-				ret = -ENOENT;
-			goto out;
+		/* do not update nlinks if existed */
+		if (!ret) {
+			/* Update nlinks for the inode */
+			key.objectid = ino;
+			key.type = BTRFS_INODE_ITEM_KEY;
+			key.offset = 0;
+			ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
+			if (ret) {
+				if (ret > 0)
+					ret = -ENOENT;
+				goto out;
+			}
+			inode_item = btrfs_item_ptr(path->nodes[0],
+				    path->slots[0], struct btrfs_inode_item);
+			nlink = btrfs_inode_nlink(path->nodes[0], inode_item);
+			nlink++;
+			btrfs_set_inode_nlink(path->nodes[0], inode_item,
+					      nlink);
+			btrfs_mark_buffer_dirty(path->nodes[0]);
+			btrfs_release_path(path);
 		}
-		inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
-				    struct btrfs_inode_item);
-		nlink = btrfs_inode_nlink(path->nodes[0], inode_item);
-		nlink++;
-		btrfs_set_inode_nlink(path->nodes[0], inode_item, nlink);
-		btrfs_mark_buffer_dirty(path->nodes[0]);
-		btrfs_release_path(path);
 	}
 
 	/* Add dir_item and dir_index */
@@ -262,7 +267,7 @@ int btrfs_add_orphan_item(struct btrfs_trans_handle *trans,
  * dir_item if any of them exists.
  *
  * If an inode's nlink is reduced to 0 and 'add_orphan' is true, it will be
- * added to orphan inode and wairing to be deleted by next kernel mount.
+ * added to orphan inode and waiting to be deleted by next kernel mount.
  */
 int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		 u64 ino, u64 parent_ino, u64 index, const char *name,
@@ -286,7 +291,7 @@ int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 
 	/* check the ref and backref exists */
 	inode_ref = btrfs_lookup_inode_ref(trans, root, path, name, namelen,
-					   ino, parent_ino, index, 0);
+					   ino, parent_ino, 0);
 	if (IS_ERR(inode_ref)) {
 		ret = PTR_ERR(inode_ref);
 		goto out;
@@ -472,6 +477,42 @@ int btrfs_new_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 }
 
 /*
+ * Change inode flags to given value
+ */
+int btrfs_change_inode_flags(struct btrfs_trans_handle *trans,
+			     struct btrfs_root *root, u64 ino, u64 flags)
+{
+	struct btrfs_inode_item *item;
+	struct btrfs_path *path;
+	struct btrfs_key key;
+	int ret;
+
+	path = btrfs_alloc_path();
+	if (!path)
+		return -ENOMEM;
+
+	key.objectid = ino;
+	key.type = BTRFS_INODE_ITEM_KEY;
+	key.offset = 0;
+
+	ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
+	if (ret > 0) {
+		ret = -ENOENT;
+		goto out;
+	}
+	if (ret < 0)
+		goto out;
+
+	item = btrfs_item_ptr(path->nodes[0], path->slots[0],
+			      struct btrfs_inode_item);
+	btrfs_set_inode_flags(path->nodes[0], item, flags);
+	btrfs_mark_buffer_dirty(path->nodes[0]);
+out:
+	btrfs_free_path(path);
+	return ret;
+}
+
+/*
  * Make a dir under the parent inode 'parent_ino' with 'name'
  * and 'mode', The owner will be root/root.
  */
@@ -525,7 +566,7 @@ int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	if (ret)
 		goto out;
 	ret = btrfs_add_link(trans, root, ret_ino, parent_ino, name, namelen,
-			     BTRFS_FT_DIR, NULL, 1);
+			     BTRFS_FT_DIR, NULL, 1, 0);
 	if (ret)
 		goto out;
 out:
@@ -534,3 +575,132 @@ out:
 		*ino = ret_ino;
 	return ret;
 }
+
+struct btrfs_root *btrfs_mksubvol(struct btrfs_root *root,
+				  const char *base, u64 root_objectid,
+				  bool convert)
+{
+	struct btrfs_trans_handle *trans;
+	struct btrfs_fs_info *fs_info = root->fs_info;
+	struct btrfs_root *tree_root = fs_info->tree_root;
+	struct btrfs_root *new_root = NULL;
+	struct btrfs_path path;
+	struct btrfs_inode_item *inode_item;
+	struct extent_buffer *leaf;
+	struct btrfs_key key;
+	u64 dirid = btrfs_root_dirid(&root->root_item);
+	u64 index = 2;
+	char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
+	int len;
+	int i;
+	int ret;
+
+	len = strlen(base);
+	if (len == 0 || len > BTRFS_NAME_LEN)
+		return NULL;
+
+	btrfs_init_path(&path);
+	key.objectid = dirid;
+	key.type = BTRFS_DIR_INDEX_KEY;
+	key.offset = (u64)-1;
+
+	ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+	if (ret <= 0) {
+		error("search for DIR_INDEX dirid %llu failed: %d",
+				(unsigned long long)dirid, ret);
+		goto fail;
+	}
+
+	if (path.slots[0] > 0) {
+		path.slots[0]--;
+		btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+		if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
+			index = key.offset + 1;
+	}
+	btrfs_release_path(&path);
+
+	trans = btrfs_start_transaction(root, 1);
+	if (IS_ERR(trans)) {
+		error("unable to start transaction");
+		goto fail;
+	}
+
+	key.objectid = dirid;
+	key.offset = 0;
+	key.type =  BTRFS_INODE_ITEM_KEY;
+
+	ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
+	if (ret) {
+		error("search for INODE_ITEM %llu failed: %d",
+				(unsigned long long)dirid, ret);
+		goto fail;
+	}
+	leaf = path.nodes[0];
+	inode_item = btrfs_item_ptr(leaf, path.slots[0],
+				    struct btrfs_inode_item);
+
+	key.objectid = root_objectid;
+	key.offset = (u64)-1;
+	key.type = BTRFS_ROOT_ITEM_KEY;
+
+	memcpy(buf, base, len);
+	if (convert) {
+		for (i = 0; i < 1024; i++) {
+			ret = btrfs_insert_dir_item(trans, root, buf, len,
+					dirid, &key, BTRFS_FT_DIR, index);
+			if (ret != -EEXIST)
+				break;
+			len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
+			if (len < 1 || len > BTRFS_NAME_LEN) {
+				ret = -EINVAL;
+				break;
+			}
+		}
+	} else {
+		ret = btrfs_insert_dir_item(trans, root, buf, len, dirid, &key,
+					    BTRFS_FT_DIR, index);
+	}
+	if (ret)
+		goto fail;
+
+	btrfs_set_inode_size(leaf, inode_item, len * 2 +
+			     btrfs_inode_size(leaf, inode_item));
+	btrfs_mark_buffer_dirty(leaf);
+	btrfs_release_path(&path);
+
+	/* add the backref first */
+	ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
+				 BTRFS_ROOT_BACKREF_KEY,
+				 root->root_key.objectid,
+				 dirid, index, buf, len);
+	if (ret) {
+		error("unable to add root backref for %llu: %d",
+				root->root_key.objectid, ret);
+		goto fail;
+	}
+
+	/* now add the forward ref */
+	ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
+				 BTRFS_ROOT_REF_KEY, root_objectid,
+				 dirid, index, buf, len);
+	if (ret) {
+		error("unable to add root ref for %llu: %d",
+				root->root_key.objectid, ret);
+		goto fail;
+	}
+
+	ret = btrfs_commit_transaction(trans, root);
+	if (ret) {
+		error("transaction commit failed: %d", ret);
+		goto fail;
+	}
+
+	new_root = btrfs_read_fs_root(fs_info, &key);
+	if (IS_ERR(new_root)) {
+		error("unable to fs read root: %lu", PTR_ERR(new_root));
+		new_root = NULL;
+	}
+fail:
+	btrfs_init_path(&path);
+	return new_root;
+}