From patchwork Wed Jun 24 16:03:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 242885 List-Id: U-Boot discussion From: marek.behun at nic.cz (=?UTF-8?q?Marek=20Beh=C3=BAn?=) Date: Wed, 24 Jun 2020 18:03:07 +0200 Subject: [PATCH U-BOOT v3 21/30] fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and btrfs_size() In-Reply-To: <20200624160316.5001-1-marek.behun@nic.cz> References: <20200624160316.5001-1-marek.behun@nic.cz> Message-ID: <20200624160316.5001-22-marek.behun@nic.cz> From: Qu Wenruo After this the only remaining function that still utilizes __btrfs_lookup_path() is btrfs_read(). Signed-off-by: Qu Wenruo Reviewed-by: Marek Beh?n --- fs/btrfs/btrfs.c | 65 +++++++++++++++++++++++++++++++++++------------- 1 file changed, 48 insertions(+), 17 deletions(-) diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c index 2278b52e4d..aec91a57ec 100644 --- a/fs/btrfs/btrfs.c +++ b/fs/btrfs/btrfs.c @@ -188,37 +188,66 @@ int btrfs_ls(const char *path) int btrfs_exists(const char *file) { - struct __btrfs_root root = btrfs_info.fs_root; - u64 inr; + struct btrfs_fs_info *fs_info = current_fs_info; + struct btrfs_root *root; + u64 ino; u8 type; + int ret; + + ASSERT(fs_info); - inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40); + ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID, + file, &root, &ino, &type, 40); + if (ret < 0) + return 0; - return (inr != -1ULL && type == BTRFS_FT_REG_FILE); + if (type == BTRFS_FT_REG_FILE) + return 1; + return 0; } int btrfs_size(const char *file, loff_t *size) { - struct __btrfs_root root = btrfs_info.fs_root; - struct btrfs_inode_item inode; - u64 inr; + struct btrfs_fs_info *fs_info = current_fs_info; + struct btrfs_inode_item *ii; + struct btrfs_root *root; + struct btrfs_path path; + struct btrfs_key key; + u64 ino; u8 type; + int ret; - inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode, - 40); - - if (inr == -1ULL) { + ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID, + file, &root, &ino, &type, 40); + if (ret < 0) { printf("Cannot lookup file %s\n", file); - return -1; + return ret; } - if (type != BTRFS_FT_REG_FILE) { printf("Not a regular file: %s\n", file); - return -1; + return -ENOENT; } + btrfs_init_path(&path); + key.objectid = ino; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; - *size = inode.size; - return 0; + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret < 0) { + printf("Cannot lookup ino %llu\n", ino); + return ret; + } + if (ret > 0) { + printf("Ino %llu does not exist\n", ino); + ret = -ENOENT; + goto out; + } + ii = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_inode_item); + *size = btrfs_inode_size(path.nodes[0], ii); +out: + btrfs_release_path(&path); + return ret; } int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len, @@ -270,7 +299,9 @@ void btrfs_close(void) int btrfs_uuid(char *uuid_str) { #ifdef CONFIG_LIB_UUID - uuid_bin_to_str(btrfs_info.sb.fsid, uuid_str, UUID_STR_FORMAT_STD); + if (current_fs_info) + uuid_bin_to_str(current_fs_info->super_copy->fsid, uuid_str, + UUID_STR_FORMAT_STD); return 0; #endif return -ENOSYS;