c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2026-05-22 02:27:36 +03:00
Code Issues Packages Projects Releases Wiki Activity

zfs label bootenv should store data as nvlist

Browse Source 
nvlist does allow us to support different data types and systems.

To encapsulate user data to/from nvlist, the libzfsbootenv library is
provided.

Reviewed-by: Arvind Sankar <nivedita@alum.mit.edu>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Toomas Soome <tsoome@me.com>
Closes #10774
This commit is contained in:
Toomas Soome
2020-09-16 01:42:27 +03:00
committed by GitHub
parent 37325e4749
commit 1db9e6e4e4
29 changed files with 886 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/vdev_label.c
+91 -25
View File
@@ -149,6 +149,8 @@
#include <sys/dsl_scan.h>
#include <sys/abd.h>
#include <sys/fs/zfs.h>
#include <sys/byteorder.h>
#include <sys/zfs_bootenv.h>
/*
* Basic routines to read and write from a vdev label.
@@ -1233,13 +1235,9 @@ vdev_label_read_bootenv_impl(zio_t *zio, vdev_t *vd, int flags)
* bootloader should have rewritten them all to be the same on boot,
* and any changes we made since boot have been the same across all
* labels.
*
* While grub supports writing to all four labels, other bootloaders
* don't, so we only use the first two labels to store boot
* information.
*/
if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) {
for (int l = 0; l < VDEV_LABELS / 2; l++) {
for (int l = 0; l < VDEV_LABELS; l++) {
vdev_label_read(zio, vd, l,
abd_alloc_linear(VDEV_PAD_SIZE, B_FALSE),
offsetof(vdev_label_t, vl_be), VDEV_PAD_SIZE,
@@ -1249,14 +1247,15 @@ vdev_label_read_bootenv_impl(zio_t *zio, vdev_t *vd, int flags)
}
int
vdev_label_read_bootenv(vdev_t *rvd, nvlist_t *command)
vdev_label_read_bootenv(vdev_t *rvd, nvlist_t *bootenv)
{
nvlist_t *config;
spa_t *spa = rvd->vdev_spa;
abd_t *abd = NULL;
int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL |
ZIO_FLAG_SPECULATIVE | ZIO_FLAG_TRYHARD;
ASSERT(command);
ASSERT(bootenv);
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
zio_t *zio = zio_root(spa, NULL, &abd, flags);
@@ -1264,39 +1263,81 @@ vdev_label_read_bootenv(vdev_t *rvd, nvlist_t *command)
int err = zio_wait(zio);
if (abd != NULL) {
char *buf;
vdev_boot_envblock_t *vbe = abd_to_buf(abd);
if (vbe->vbe_version != VB_RAW) {
abd_free(abd);
return (SET_ERROR(ENOTSUP));
vbe->vbe_version = ntohll(vbe->vbe_version);
switch (vbe->vbe_version) {
case VB_RAW:
/*
* if we have textual data in vbe_bootenv, create nvlist
* with key "envmap".
*/
fnvlist_add_uint64(bootenv, BOOTENV_VERSION, VB_RAW);
vbe->vbe_bootenv[sizeof (vbe->vbe_bootenv) - 1] = '\0';
fnvlist_add_string(bootenv, GRUB_ENVMAP,
vbe->vbe_bootenv);
break;
case VB_NVLIST:
err = nvlist_unpack(vbe->vbe_bootenv,
sizeof (vbe->vbe_bootenv), &config, 0);
if (err == 0) {
fnvlist_merge(bootenv, config);
nvlist_free(config);
break;
}
/* FALLTHROUGH */
default:
/* Check for FreeBSD zfs bootonce command string */
buf = abd_to_buf(abd);
if (*buf == '\0') {
fnvlist_add_uint64(bootenv, BOOTENV_VERSION,
VB_NVLIST);
break;
}
fnvlist_add_string(bootenv, FREEBSD_BOOTONCE, buf);
}
vbe->vbe_bootenv[sizeof (vbe->vbe_bootenv) - 1] = '\0';
fnvlist_add_string(command, "envmap", vbe->vbe_bootenv);
/* abd was allocated in vdev_label_read_bootenv_impl() */
/*
* abd was allocated in vdev_label_read_bootenv_impl()
*/
abd_free(abd);
/* If we managed to read any successfully, return success. */
/*
* If we managed to read any successfully,
* return success.
*/
return (0);
}
return (err);
}
int
vdev_label_write_bootenv(vdev_t *vd, char *envmap)
vdev_label_write_bootenv(vdev_t *vd, nvlist_t *env)
{
zio_t *zio;
spa_t *spa = vd->vdev_spa;
vdev_boot_envblock_t *bootenv;
int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL;
int error = ENXIO;
int error;
size_t nvsize;
char *nvbuf;
if (strlen(envmap) >= sizeof (bootenv->vbe_bootenv)) {
error = nvlist_size(env, &nvsize, NV_ENCODE_XDR);
if (error != 0)
return (SET_ERROR(error));
if (nvsize >= sizeof (bootenv->vbe_bootenv)) {
return (SET_ERROR(E2BIG));
}
ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);
error = ENXIO;
for (int c = 0; c < vd->vdev_children; c++) {
int child_err = vdev_label_write_bootenv(vd->vdev_child[c],
envmap);
int child_err;
child_err = vdev_label_write_bootenv(vd->vdev_child[c], env);
/*
* As long as any of the disks managed to write all of their
* labels successfully, return success.
@@ -1312,16 +1353,41 @@ vdev_label_write_bootenv(vdev_t *vd, char *envmap)
ASSERT3U(sizeof (*bootenv), ==, VDEV_PAD_SIZE);
abd_t *abd = abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE);
abd_zero(abd, VDEV_PAD_SIZE);
bootenv = abd_borrow_buf_copy(abd, VDEV_PAD_SIZE);
char *buf = bootenv->vbe_bootenv;
(void) strlcpy(buf, envmap, sizeof (bootenv->vbe_bootenv));
bootenv->vbe_version = VB_RAW;
abd_return_buf_copy(abd, bootenv, VDEV_PAD_SIZE);
bootenv = abd_borrow_buf_copy(abd, VDEV_PAD_SIZE);
nvbuf = bootenv->vbe_bootenv;
nvsize = sizeof (bootenv->vbe_bootenv);
bootenv->vbe_version = fnvlist_lookup_uint64(env, BOOTENV_VERSION);
switch (bootenv->vbe_version) {
case VB_RAW:
if (nvlist_lookup_string(env, GRUB_ENVMAP, &nvbuf) == 0) {
(void) strlcpy(bootenv->vbe_bootenv, nvbuf, nvsize);
}
error = 0;
break;
case VB_NVLIST:
error = nvlist_pack(env, &nvbuf, &nvsize, NV_ENCODE_XDR,
KM_SLEEP);
break;
default:
error = EINVAL;
break;
}
if (error == 0) {
bootenv->vbe_version = htonll(bootenv->vbe_version);
abd_return_buf_copy(abd, bootenv, VDEV_PAD_SIZE);
} else {
abd_free(abd);
return (SET_ERROR(error));
}
retry:
zio = zio_root(spa, NULL, NULL, flags);
for (int l = 0; l < VDEV_LABELS / 2; l++) {
for (int l = 0; l < VDEV_LABELS; l++) {
vdev_label_write(zio, vd, l, abd,
offsetof(vdev_label_t, vl_be),
VDEV_PAD_SIZE, NULL, NULL, flags);