grub2/0076-grub2-btrfs-03-follow_default.patch
Petr Šabata 100e37f2e6 RHEL 9.0.0 Alpha bootstrap
The content of this branch was automatically imported from Fedora ELN
with the following as its source:
https://src.fedoraproject.org/rpms/grub2#f7e054f3d693af43a903faf33b70673f7aca4508
2020-10-15 09:48:35 +02:00

197 lines
5.7 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Thu, 21 Aug 2014 03:39:11 +0000
Subject: [PATCH] grub2-btrfs-03-follow_default
---
grub-core/fs/btrfs.c | 107 ++++++++++++++++++++++++++++++++++++---------------
1 file changed, 76 insertions(+), 31 deletions(-)
diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
index 2d099b18ea1..2db89f71ea5 100644
--- a/grub-core/fs/btrfs.c
+++ b/grub-core/fs/btrfs.c
@@ -1236,6 +1236,7 @@ grub_btrfs_mount (grub_device_t dev)
{
struct grub_btrfs_data *data;
grub_err_t err;
+ const char *relpath = grub_env_get ("btrfs_relative_path");
if (!dev->disk)
{
@@ -1266,11 +1267,14 @@ grub_btrfs_mount (grub_device_t dev)
data->devices_attached[0].dev = dev;
data->devices_attached[0].id = data->sblock.this_device.device_id;
- err = btrfs_handle_subvol (data);
- if (err)
+ if (relpath && (relpath[0] == '1' || relpath[0] == 'y'))
{
- grub_free (data);
- return NULL;
+ err = btrfs_handle_subvol (data);
+ if (err)
+ {
+ grub_free (data);
+ return NULL;
+ }
}
return data;
@@ -1835,24 +1839,39 @@ find_path (struct grub_btrfs_data *data,
grub_size_t allocated = 0;
struct grub_btrfs_dir_item *direl = NULL;
struct grub_btrfs_key key_out;
+ int follow_default;
const char *ctoken;
grub_size_t ctokenlen;
char *path_alloc = NULL;
char *origpath = NULL;
unsigned symlinks_max = 32;
+ const char *relpath = grub_env_get ("btrfs_relative_path");
+ follow_default = 0;
origpath = grub_strdup (path);
if (!origpath)
return grub_errno;
- if (data->fs_tree)
+ if (relpath && (relpath[0] == '1' || relpath[0] == 'y'))
{
- *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
- *tree = data->fs_tree;
- /* This is a tree root, so everything starts at objectid 256 */
- key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
- key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
- key->offset = 0;
+ if (data->fs_tree)
+ {
+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
+ *tree = data->fs_tree;
+ /* This is a tree root, so everything starts at objectid 256 */
+ key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
+ key->offset = 0;
+ }
+ else
+ {
+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
+ *tree = data->sblock.root_tree;
+ key->object_id = data->sblock.root_dir_objectid;
+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
+ key->offset = 0;
+ follow_default = 1;
+ }
}
else
{
@@ -1863,15 +1882,23 @@ find_path (struct grub_btrfs_data *data,
while (1)
{
- while (path[0] == '/')
- path++;
- if (!path[0])
- break;
- slash = grub_strchr (path, '/');
- if (!slash)
- slash = path + grub_strlen (path);
- ctoken = path;
- ctokenlen = slash - path;
+ if (!follow_default)
+ {
+ while (path[0] == '/')
+ path++;
+ if (!path[0])
+ break;
+ slash = grub_strchr (path, '/');
+ if (!slash)
+ slash = path + grub_strlen (path);
+ ctoken = path;
+ ctokenlen = slash - path;
+ }
+ else
+ {
+ ctoken = "default";
+ ctokenlen = sizeof ("default") - 1;
+ }
if (*type != GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY)
{
@@ -1882,7 +1909,9 @@ find_path (struct grub_btrfs_data *data,
if (ctokenlen == 1 && ctoken[0] == '.')
{
- path = slash;
+ if (!follow_default)
+ path = slash;
+ follow_default = 0;
continue;
}
if (ctokenlen == 2 && ctoken[0] == '.' && ctoken[1] == '.')
@@ -1913,8 +1942,9 @@ find_path (struct grub_btrfs_data *data,
*type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
key->object_id = key_out.offset;
- path = slash;
-
+ if (!follow_default)
+ path = slash;
+ follow_default = 0;
continue;
}
@@ -1983,7 +2013,9 @@ find_path (struct grub_btrfs_data *data,
return err;
}
- path = slash;
+ if (!follow_default)
+ path = slash;
+ follow_default = 0;
if (cdirel->type == GRUB_BTRFS_DIR_ITEM_TYPE_SYMLINK)
{
struct grub_btrfs_inode inode;
@@ -2033,14 +2065,26 @@ find_path (struct grub_btrfs_data *data,
path = path_alloc = tmp;
if (path[0] == '/')
{
- if (data->fs_tree)
+ if (relpath && (relpath[0] == '1' || relpath[0] == 'y'))
{
- *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
- *tree = data->fs_tree;
- /* This is a tree root, so everything starts at objectid 256 */
- key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
- key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
- key->offset = 0;
+ if (data->fs_tree)
+ {
+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
+ *tree = data->fs_tree;
+ /* This is a tree root, so everything starts at objectid 256 */
+ key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
+ key->offset = 0;
+ }
+ else
+ {
+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
+ *tree = data->sblock.root_tree;
+ key->object_id = data->sblock.root_dir_objectid;
+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
+ key->offset = 0;
+ follow_default = 1;
+ }
}
else
{
@@ -2696,6 +2740,7 @@ GRUB_MOD_INIT (btrfs)
subvolid_set_env);
grub_env_export ("btrfs_subvol");
grub_env_export ("btrfs_subvolid");
+ grub_env_export ("btrfs_relative_path");
}
GRUB_MOD_FINI (btrfs)