197 lines
5.7 KiB
Diff
197 lines
5.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Michael Chang <mchang@suse.com>
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Date: Thu, 21 Aug 2014 03:39:11 +0000
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Subject: [PATCH] grub2-btrfs-03-follow_default
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---
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grub-core/fs/btrfs.c | 107 ++++++++++++++++++++++++++++++++++++---------------
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1 file changed, 76 insertions(+), 31 deletions(-)
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diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
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index 88d727d16..a47d29756 100644
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--- a/grub-core/fs/btrfs.c
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+++ b/grub-core/fs/btrfs.c
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@@ -920,6 +920,7 @@ grub_btrfs_mount (grub_device_t dev)
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{
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struct grub_btrfs_data *data;
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grub_err_t err;
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+ const char *relpath = grub_env_get ("btrfs_relative_path");
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if (!dev->disk)
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{
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@@ -950,11 +951,14 @@ grub_btrfs_mount (grub_device_t dev)
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data->devices_attached[0].dev = dev;
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data->devices_attached[0].id = data->sblock.this_device.device_id;
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- err = btrfs_handle_subvol (data);
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- if (err)
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+ if (relpath && (relpath[0] == '1' || relpath[0] == 'y'))
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{
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- grub_free (data);
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- return NULL;
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+ err = btrfs_handle_subvol (data);
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+ if (err)
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+ {
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+ grub_free (data);
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+ return NULL;
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+ }
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}
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return data;
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@@ -1414,24 +1418,39 @@ find_path (struct grub_btrfs_data *data,
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grub_size_t allocated = 0;
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struct grub_btrfs_dir_item *direl = NULL;
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struct grub_btrfs_key key_out;
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+ int follow_default;
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const char *ctoken;
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grub_size_t ctokenlen;
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char *path_alloc = NULL;
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char *origpath = NULL;
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unsigned symlinks_max = 32;
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+ const char *relpath = grub_env_get ("btrfs_relative_path");
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+ follow_default = 0;
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origpath = grub_strdup (path);
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if (!origpath)
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return grub_errno;
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- if (data->fs_tree)
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+ if (relpath && (relpath[0] == '1' || relpath[0] == 'y'))
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{
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- *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
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- *tree = data->fs_tree;
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- /* This is a tree root, so everything starts at objectid 256 */
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- key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
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- key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
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- key->offset = 0;
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+ if (data->fs_tree)
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+ {
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+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
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+ *tree = data->fs_tree;
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+ /* This is a tree root, so everything starts at objectid 256 */
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+ key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
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+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
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+ key->offset = 0;
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+ }
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+ else
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+ {
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+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
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+ *tree = data->sblock.root_tree;
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+ key->object_id = data->sblock.root_dir_objectid;
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+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
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+ key->offset = 0;
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+ follow_default = 1;
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+ }
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}
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else
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{
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@@ -1442,15 +1461,23 @@ find_path (struct grub_btrfs_data *data,
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while (1)
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{
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- while (path[0] == '/')
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- path++;
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- if (!path[0])
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- break;
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- slash = grub_strchr (path, '/');
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- if (!slash)
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- slash = path + grub_strlen (path);
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- ctoken = path;
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- ctokenlen = slash - path;
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+ if (!follow_default)
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+ {
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+ while (path[0] == '/')
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+ path++;
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+ if (!path[0])
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+ break;
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+ slash = grub_strchr (path, '/');
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+ if (!slash)
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+ slash = path + grub_strlen (path);
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+ ctoken = path;
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+ ctokenlen = slash - path;
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+ }
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+ else
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+ {
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+ ctoken = "default";
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+ ctokenlen = sizeof ("default") - 1;
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+ }
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if (*type != GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY)
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{
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@@ -1461,7 +1488,9 @@ find_path (struct grub_btrfs_data *data,
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if (ctokenlen == 1 && ctoken[0] == '.')
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{
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- path = slash;
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+ if (!follow_default)
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+ path = slash;
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+ follow_default = 0;
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continue;
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}
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if (ctokenlen == 2 && ctoken[0] == '.' && ctoken[1] == '.')
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@@ -1492,8 +1521,9 @@ find_path (struct grub_btrfs_data *data,
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*type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
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key->object_id = key_out.offset;
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- path = slash;
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-
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+ if (!follow_default)
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+ path = slash;
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+ follow_default = 0;
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continue;
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}
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@@ -1562,7 +1592,9 @@ find_path (struct grub_btrfs_data *data,
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return err;
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}
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- path = slash;
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+ if (!follow_default)
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+ path = slash;
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+ follow_default = 0;
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if (cdirel->type == GRUB_BTRFS_DIR_ITEM_TYPE_SYMLINK)
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{
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struct grub_btrfs_inode inode;
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@@ -1612,14 +1644,26 @@ find_path (struct grub_btrfs_data *data,
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path = path_alloc = tmp;
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if (path[0] == '/')
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{
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- if (data->fs_tree)
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+ if (relpath && (relpath[0] == '1' || relpath[0] == 'y'))
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{
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- *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
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- *tree = data->fs_tree;
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- /* This is a tree root, so everything starts at objectid 256 */
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- key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
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- key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
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- key->offset = 0;
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+ if (data->fs_tree)
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+ {
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+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
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+ *tree = data->fs_tree;
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+ /* This is a tree root, so everything starts at objectid 256 */
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+ key->object_id = grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK);
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+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
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+ key->offset = 0;
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+ }
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+ else
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+ {
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+ *type = GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY;
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+ *tree = data->sblock.root_tree;
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+ key->object_id = data->sblock.root_dir_objectid;
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+ key->type = GRUB_BTRFS_ITEM_TYPE_DIR_ITEM;
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+ key->offset = 0;
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+ follow_default = 1;
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+ }
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}
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else
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{
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@@ -2275,6 +2319,7 @@ GRUB_MOD_INIT (btrfs)
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subvolid_set_env);
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grub_env_export ("btrfs_subvol");
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grub_env_export ("btrfs_subvolid");
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+ grub_env_export ("btrfs_relative_path");
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}
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GRUB_MOD_FINI (btrfs)
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