forked from pool/grub2
- Fix btrfs subvolume for platform modules not mounting at runtime when the default subvolume is the topmost root tree (bsc#1228124) * grub2-btrfs-06-subvol-mount.patch - Rediff * 0001-Unify-the-check-to-enable-btrfs-relative-path.patch OBS-URL: https://build.opensuse.org/request/show/1191159 OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=511
534 lines
13 KiB
Diff
534 lines
13 KiB
Diff
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V2:
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* Fix grub2-install --root-directory does not work for /boot/grub2/<arch> on
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separate btrfs subvolume (boo#1098420)
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v3:
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* Fix executable stack on which function trampoline is constructed to support
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closure (nested function). The closure sematic is replaced.
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v4:
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* Fix btrfs subvolume for platform modules not mounting at runtime when the
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default subvolume is the topmost root tree (bsc#1228124)
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--- a/grub-core/fs/btrfs.c
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+++ b/grub-core/fs/btrfs.c
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@@ -44,6 +44,7 @@
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#include <grub/command.h>
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#include <grub/env.h>
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#include <grub/extcmd.h>
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+#include <grub/list.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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@@ -266,6 +267,12 @@
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grub_btrfs_read_logical (struct grub_btrfs_data *data,
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grub_disk_addr_t addr, void *buf, grub_size_t size,
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int recursion_depth);
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+static grub_err_t
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+get_root (struct grub_btrfs_data *data, struct grub_btrfs_key *key,
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+ grub_uint64_t *tree, grub_uint8_t *type);
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+
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+grub_uint64_t
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+find_mtab_subvol_tree (const char *path, char **path_in_subvol);
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static grub_err_t
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read_sblock (grub_disk_t disk, struct grub_btrfs_superblock *sb)
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@@ -1302,9 +1309,26 @@
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grub_err_t err;
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grub_uint64_t tree = 0;
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grub_uint8_t type;
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+ grub_uint64_t saved_tree;
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struct grub_btrfs_key key;
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+ if (path[0] == '\0')
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+ {
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+ data->fs_tree = 0;
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+ return GRUB_ERR_NONE;
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+ }
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+
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+ err = get_root (data, &key, &tree, &type);
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+ if (err)
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+ return err;
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+
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+ saved_tree = data->fs_tree;
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+ data->fs_tree = tree;
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+
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err = find_path (data, path, &key, &tree, &type);
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+
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+ data->fs_tree = saved_tree;
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+
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if (err)
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return grub_error(GRUB_ERR_FILE_NOT_FOUND, "couldn't locate %s\n", path);
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@@ -2323,11 +2347,20 @@
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grub_uint64_t tree;
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grub_uint8_t type;
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grub_size_t est_size = 0;
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+ char *new_path = NULL;
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if (!data)
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return grub_errno;
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- err = find_path (data, path, &key_in, &tree, &type);
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+ tree = find_mtab_subvol_tree (path, &new_path);
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+
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+ if (tree)
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+ data->fs_tree = tree;
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+
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+ err = find_path (data, new_path ? new_path : path, &key_in, &tree, &type);
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+ if (new_path)
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+ grub_free (new_path);
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+
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if (err)
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{
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grub_btrfs_unmount (data);
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@@ -2454,11 +2487,21 @@
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struct grub_btrfs_inode inode;
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grub_uint8_t type;
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struct grub_btrfs_key key_in;
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+ grub_uint64_t tree;
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+ char *new_path = NULL;
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if (!data)
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return grub_errno;
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- err = find_path (data, name, &key_in, &data->tree, &type);
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+ tree = find_mtab_subvol_tree (name, &new_path);
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+
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+ if (tree)
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+ data->fs_tree = tree;
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+
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+ err = find_path (data, new_path ? new_path : name, &key_in, &data->tree, &type);
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+ if (new_path)
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+ grub_free (new_path);
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+
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if (err)
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{
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grub_btrfs_unmount (data);
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@@ -2693,6 +2736,150 @@
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return 0;
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}
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+struct grub_btrfs_mtab
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+{
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+ struct grub_btrfs_mtab *next;
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+ struct grub_btrfs_mtab **prev;
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+ char *path;
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+ char *subvol;
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+ grub_uint64_t tree;
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+};
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+
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+typedef struct grub_btrfs_mtab* grub_btrfs_mtab_t;
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+
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+static struct grub_btrfs_mtab *btrfs_mtab;
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+
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+#define FOR_GRUB_MTAB(var) FOR_LIST_ELEMENTS (var, btrfs_mtab)
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+#define FOR_GRUB_MTAB_SAFE(var, next) FOR_LIST_ELEMENTS_SAFE((var), (next), btrfs_mtab)
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+
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+static void
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+add_mountpoint (const char *path, const char *subvol, grub_uint64_t tree)
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+{
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+ grub_btrfs_mtab_t m = grub_malloc (sizeof (*m));
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+
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+ m->path = grub_strdup (path);
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+ m->subvol = grub_strdup (subvol);
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+ m->tree = tree;
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+ grub_list_push (GRUB_AS_LIST_P (&btrfs_mtab), GRUB_AS_LIST (m));
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+}
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+
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+static grub_err_t
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+grub_cmd_btrfs_mount_subvol (grub_command_t cmd __attribute__ ((unused)), int argc,
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+ char **argv)
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+{
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+ char *devname, *dirname, *subvol;
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+ struct grub_btrfs_key key_in;
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+ grub_uint8_t type;
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+ grub_uint64_t tree;
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+ grub_uint64_t saved_tree;
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+ grub_err_t err;
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+ struct grub_btrfs_data *data = NULL;
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+ grub_device_t dev = NULL;
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+
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+ if (argc < 3)
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+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "required <dev> <dir> and <subvol>");
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+
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+ devname = grub_file_get_device_name(argv[0]);
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+ dev = grub_device_open (devname);
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+ grub_free (devname);
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+
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+ if (!dev)
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+ {
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+ err = grub_errno;
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+ goto err_out;
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+ }
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+
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+ dirname = argv[1];
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+ subvol = argv[2];
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+
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+ data = grub_btrfs_mount (dev);
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+ if (!data)
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+ {
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+ err = grub_errno;
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+ goto err_out;
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+ }
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+
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+ err = find_path (data, dirname, &key_in, &tree, &type);
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+ if (err)
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+ goto err_out;
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+
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+ if (type != GRUB_BTRFS_DIR_ITEM_TYPE_DIRECTORY)
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+ {
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+ err = grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("not a directory"));
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+ goto err_out;
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+ }
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+
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+ err = get_root (data, &key_in, &tree, &type);
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+
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+ if (err)
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+ goto err_out;
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+
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+ saved_tree = data->fs_tree;
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+ data->fs_tree = tree;
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+ err = find_path (data, subvol, &key_in, &tree, &type);
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+ data->fs_tree = saved_tree;
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+
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+ if (err)
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+ goto err_out;
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+
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+ if (key_in.object_id != grub_cpu_to_le64_compile_time (GRUB_BTRFS_OBJECT_ID_CHUNK) || tree == 0)
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+ {
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+ err = grub_error (GRUB_ERR_BAD_FILE_TYPE, "%s: not a subvolume\n", subvol);
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+ goto err_out;
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+ }
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+
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+ grub_btrfs_unmount (data);
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+ grub_device_close (dev);
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+ add_mountpoint (dirname, subvol, tree);
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+
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+ return GRUB_ERR_NONE;
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+
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+err_out:
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+
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+ if (data)
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+ grub_btrfs_unmount (data);
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+
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+ if (dev)
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+ grub_device_close (dev);
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+
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+ return err;
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+}
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+
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+grub_uint64_t
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+find_mtab_subvol_tree (const char *path, char **path_in_subvol)
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+{
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+ grub_btrfs_mtab_t m, cm;
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+ grub_uint64_t tree;
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+
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+ if (!path || !path_in_subvol)
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+ return 0;
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+
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+ *path_in_subvol = NULL;
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+ tree = 0;
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+ cm = NULL;
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+
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+ FOR_GRUB_MTAB (m)
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+ {
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+ if (grub_strncmp (path, m->path, grub_strlen (m->path)) == 0)
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+ {
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+ if (!cm)
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+ cm = m;
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+ else
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+ if (grub_strcmp (m->path, cm->path) > 0)
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+ cm = m;
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+ }
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+ }
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+
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+ if (cm)
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+ {
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+ const char *s = path + grub_strlen (cm->path);
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+ *path_in_subvol = (s[0] == '\0') ? grub_strdup ("/") : grub_strdup (s);
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+ tree = cm->tree;
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+ }
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+
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+ return tree;
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+}
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+
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static grub_err_t
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get_fs_root(struct grub_btrfs_data *data, grub_uint64_t tree,
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grub_uint64_t objectid, grub_uint64_t offset,
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@@ -2905,6 +3092,7 @@
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};
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static grub_command_t cmd_info;
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+static grub_command_t cmd_mount_subvol;
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static grub_extcmd_t cmd_list_subvols;
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static char *
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@@ -2968,6 +3156,9 @@
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cmd_info = grub_register_command("btrfs-info", grub_cmd_btrfs_info,
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"DEVICE",
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"Print BtrFS info about DEVICE.");
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+ cmd_mount_subvol = grub_register_command("btrfs-mount-subvol", grub_cmd_btrfs_mount_subvol,
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+ "DEVICE DIRECTORY SUBVOL",
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+ "Set btrfs DEVICE the DIRECTORY a mountpoint of SUBVOL.");
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cmd_list_subvols = grub_register_extcmd("btrfs-list-subvols",
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grub_cmd_btrfs_list_subvols, 0,
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"[-p|-n] [-o var] DEVICE",
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--- a/grub-core/osdep/linux/getroot.c
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+++ b/grub-core/osdep/linux/getroot.c
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@@ -103,6 +103,14 @@
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grub_uint32_t unused[9];
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};
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+struct btrfs_ioctl_search_header {
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+ grub_uint64_t transid;
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+ grub_uint64_t objectid;
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+ grub_uint64_t offset;
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+ grub_uint32_t type;
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+ grub_uint32_t len;
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+};
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+
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struct btrfs_ioctl_search_args {
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struct btrfs_ioctl_search_key key;
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grub_uint64_t buf[(4096 - sizeof(struct btrfs_ioctl_search_key))
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@@ -375,6 +383,117 @@
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int use_relative_path_on_btrfs = 0;
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+static char *
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+get_btrfs_subvol (const char *path, grub_uint64_t *subvolid)
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+{
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+ struct btrfs_ioctl_ino_lookup_args args;
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+ grub_uint64_t tree_id;
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+ grub_uint64_t ret_id;
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+ int fd = -1;
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+ char *ret = NULL;
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+
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+ if (subvolid)
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+ *subvolid = 0;
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+
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+ fd = open (path, O_RDONLY);
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+
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+ if (fd < 0)
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+ return NULL;
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+
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+ memset (&args, 0, sizeof(args));
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+ args.objectid = GRUB_BTRFS_TREE_ROOT_OBJECTID;
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+
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+ if (ioctl (fd, BTRFS_IOC_INO_LOOKUP, &args) < 0)
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+ goto error;
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+
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+ tree_id = args.treeid;
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+ ret_id = args.treeid;
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+
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+ while (tree_id != GRUB_BTRFS_ROOT_VOL_OBJECTID)
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+ {
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+ struct btrfs_ioctl_search_args sargs;
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+ struct grub_btrfs_root_backref *br;
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+ struct btrfs_ioctl_search_header *search_header;
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+ char *old;
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+ grub_uint16_t len;
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+ grub_uint64_t inode_id;
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+
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+ memset (&sargs, 0, sizeof(sargs));
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+
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+ sargs.key.tree_id = 1;
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+ sargs.key.min_objectid = tree_id;
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+ sargs.key.max_objectid = tree_id;
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+
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+ sargs.key.min_offset = 0;
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+ sargs.key.max_offset = ~0ULL;
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+ sargs.key.min_transid = 0;
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+ sargs.key.max_transid = ~0ULL;
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+ sargs.key.min_type = GRUB_BTRFS_ITEM_TYPE_ROOT_BACKREF;
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+ sargs.key.max_type = GRUB_BTRFS_ITEM_TYPE_ROOT_BACKREF;
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+
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+ sargs.key.nr_items = 1;
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+
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+ if (ioctl (fd, BTRFS_IOC_TREE_SEARCH, &sargs) < 0)
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+ goto error;
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+
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+ if (sargs.key.nr_items == 0)
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+ goto error;
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+
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+ search_header = (struct btrfs_ioctl_search_header *)sargs.buf;
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+ br = (struct grub_btrfs_root_backref *) (search_header + 1);
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+
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+ len = grub_le_to_cpu16 (br->n);
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+ inode_id = grub_le_to_cpu64 (br->inode_id);
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+ tree_id = search_header->offset;
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+
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+ old = ret;
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+ ret = malloc (len + 1);
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+ memcpy (ret, br->name, len);
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+ ret[len] = '\0';
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+
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+ if (inode_id != GRUB_BTRFS_TREE_ROOT_OBJECTID)
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+ {
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+ char *s;
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+
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+ memset(&args, 0, sizeof(args));
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+ args.treeid = search_header->offset;
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+ args.objectid = inode_id;
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+
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+ if (ioctl (fd, BTRFS_IOC_INO_LOOKUP, &args) < 0)
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+ goto error;
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+
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+ s = xasprintf ("%s%s", args.name, ret);
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+ free (ret);
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+ ret = s;
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+ }
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+
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+ if (old)
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+ {
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+ char *s = xasprintf ("%s/%s", ret, old);
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+ free (ret);
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+ free (old);
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+ ret = s;
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+ }
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+ }
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+
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+ if (subvolid)
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+ *subvolid = ret_id;
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+
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+ close (fd);
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+ return ret;
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+
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+error:
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+
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+ if (fd >= 0)
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+ close (fd);
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+ if (ret)
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+ free (ret);
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+
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+ return NULL;
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+}
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+
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+static char *grub_btrfs_mount_path;
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+
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char **
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grub_find_root_devices_from_mountinfo (const char *dir, char **relroot)
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{
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@@ -516,12 +635,17 @@
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else if (grub_strcmp (entries[i].fstype, "btrfs") == 0)
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{
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ret = grub_find_root_devices_from_btrfs (dir);
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- fs_prefix = get_btrfs_fs_prefix (entries[i].enc_path);
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if (use_relative_path_on_btrfs)
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{
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- if (fs_prefix)
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- free (fs_prefix);
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fs_prefix = xstrdup ("/");
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+
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+ if (grub_btrfs_mount_path)
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+ grub_free (grub_btrfs_mount_path);
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+ grub_btrfs_mount_path = grub_strdup (entries[i].enc_path);
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+ }
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+ else
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+ {
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+ fs_prefix = get_btrfs_fs_prefix (entries[i].enc_path);
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}
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}
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else if (!retry && grub_strcmp (entries[i].fstype, "autofs") == 0)
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@@ -1202,6 +1326,24 @@
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return grub_dev;
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}
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+
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+char *
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+grub_util_get_btrfs_subvol (const char *path, char **mount_path, grub_uint64_t *subvolid)
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+{
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+ if (mount_path)
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+ *mount_path = NULL;
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+
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+ grub_free (grub_find_root_devices_from_mountinfo (path, NULL));
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+
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+ if (!grub_btrfs_mount_path)
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+ return NULL;
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+
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+ if (mount_path)
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+ *mount_path = grub_strdup (grub_btrfs_mount_path);
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+
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+ return get_btrfs_subvol (grub_btrfs_mount_path, subvolid);
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+}
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+
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char *
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grub_make_system_path_relative_to_its_root_os (const char *path)
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{
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--- a/util/grub-install.c
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+++ b/util/grub-install.c
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@@ -1646,6 +1646,58 @@
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prefix_drive = xasprintf ("(%s)", grub_drives[0]);
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}
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+#ifdef __linux__
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+
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+ if (config.is_suse_btrfs_snapshot_enabled
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+ && grub_strncmp(grub_fs->name, "btrfs", sizeof ("btrfs") - 1) == 0)
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+ {
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+ char *subvol = NULL;
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+ char *mount_path = NULL;
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+ grub_uint64_t subvolid = 0;
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+ char **rootdir_devices = NULL;
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+ char *t = grub_util_path_concat (2, "/", rootdir);
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+ char *rootdir_path = grub_canonicalize_file_name (t);
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+
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+ if (rootdir_path && grub_util_is_directory (rootdir_path))
|
|
+ rootdir_devices = grub_guess_root_devices (rootdir_path);
|
|
+
|
|
+ if (rootdir_devices && rootdir_devices[0])
|
|
+ if (grub_strcmp (rootdir_devices[0], grub_devices[0]) == 0)
|
|
+ subvol = grub_util_get_btrfs_subvol (platdir, &mount_path, &subvolid);
|
|
+
|
|
+ if (subvol && mount_path)
|
|
+ {
|
|
+ grub_uint64_t def_subvolid = 0;
|
|
+
|
|
+ grub_free (grub_util_get_btrfs_subvol (rootdir_path, NULL, &def_subvolid));
|
|
+
|
|
+ if (def_subvolid)
|
|
+ {
|
|
+ char *rootdir_mount_path = NULL;
|
|
+ if (!load_cfg_f)
|
|
+ load_cfg_f = grub_util_fopen (load_cfg, "wb");
|
|
+ have_load_cfg = 1;
|
|
+
|
|
+ if (grub_strncmp (rootdir_path, mount_path, grub_strlen (rootdir_path)) == 0)
|
|
+ rootdir_mount_path = grub_util_path_concat (2, "/", mount_path + grub_strlen (rootdir_path));
|
|
+
|
|
+ if (subvolid != def_subvolid && rootdir_mount_path)
|
|
+ fprintf (load_cfg_f, "btrfs-mount-subvol ($root) %s %s\n", rootdir_mount_path, subvol);
|
|
+ free (rootdir_mount_path);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ free (t);
|
|
+ free (rootdir_path);
|
|
+ for (curdev = rootdir_devices; *curdev; curdev++)
|
|
+ free (*curdev);
|
|
+ free (rootdir_devices);
|
|
+ free (subvol);
|
|
+ free (mount_path);
|
|
+ }
|
|
+
|
|
+#endif
|
|
+
|
|
char mkimage_target[200];
|
|
const char *core_name = NULL;
|
|
|
|
--- a/include/grub/emu/getroot.h
|
|
+++ b/include/grub/emu/getroot.h
|
|
@@ -53,6 +53,11 @@
|
|
grub_find_root_devices_from_mountinfo (const char *dir, char **relroot);
|
|
#endif
|
|
|
|
+#ifdef __linux__
|
|
+char *
|
|
+grub_util_get_btrfs_subvol (const char *path, char **mount_path, grub_uint64_t *subvolid);
|
|
+#endif
|
|
+
|
|
/* Devmapper functions provided by getroot_devmapper.c. */
|
|
void
|
|
grub_util_pull_devmapper (const char *os_dev);
|