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Split bdev into modules: lxcaufs

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The functions

	- aufs_clonepaths();
	- aufs_create();
	- aufs_destroy();
	- aufs_detect();
	- aufs_mount();
	- aufs_umount();

move from bdev.c to lxcaufs.{c,h}. All functions which previously were static
become extern.

Adapt Makefile.am to include lxcaufs.{c,h}.

The structs

       - struct bdev; /* defined in bdev.h */
       - struct bdev_specs; /* defined in lxccontainer.h */
       - struct lxc_conf; /* defined conf.h */

are forward declared/put as incomplete types into lxcaufs.h as the functions
associated with aufs need access to it.

Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>
This commit is contained in:
Christian Brauner 2015-12-30 14:38:44 +01:00
parent 2b9cbd533d
commit 00f0a1f896
4 changed files with 376 additions and 300 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/lxc/Makefile.am
View File

@ -7,6 +7,7 @@ noinst_HEADERS = \
arguments.h \
attach.h \
bdev/bdev.h \
bdev/lxcaufs.h \
bdev/lxcbtrfs.h \
bdev/lxclvm.h \
bdev/lxcoverlay.h \
@ -65,6 +66,7 @@ endif
liblxc_so_SOURCES = \
arguments.c arguments.h \
bdev/bdev.c bdev/bdev.h \
bdev/lxcaufs.c bdev/lxcaufs.h \
bdev/lxcbtrfs.c bdev/lxcbtrfs.h \
bdev/lxclvm.c bdev/lxclvm.h \
bdev/lxcoverlay.c bdev/lxcoverlay.h \

312
src/lxc/bdev/bdev.c
View File

@ -53,6 +53,7 @@
#include "error.h"
#include "log.h"
#include "lxc.h"
#include "lxcaufs.h"
#include "lxcbtrfs.h"
#include "lxclock.h"
#include "lxclvm.h"
@ -77,6 +78,18 @@
lxc_log_define(bdev, lxc);
/* aufs */
static const struct bdev_ops aufs_ops = {
.detect = &aufs_detect,
.mount = &aufs_mount,
.umount = &aufs_umount,
.clone_paths = &aufs_clonepaths,
.destroy = &aufs_destroy,
.create = &aufs_create,
.can_snapshot = true,
.can_backup = true,
};
/* btrfs */
static const struct bdev_ops btrfs_ops = {
.detect = &btrfs_detect,
@ -125,18 +138,6 @@ static const struct bdev_ops zfs_ops = {
.can_backup = true,
};
/* functions associated with an aufs bdev struct */
static int aufs_clonepaths(struct bdev *orig, struct bdev *new,
const char *oldname, const char *cname,
const char *oldpath, const char *lxcpath, int snap,
uint64_t newsize, struct lxc_conf *conf);
static int aufs_create(struct bdev *bdev, const char *dest, const char *n,
struct bdev_specs *specs);
static int aufs_destroy(struct bdev *orig);
static int aufs_detect(const char *path);
static int aufs_mount(struct bdev *bdev);
static int aufs_umount(struct bdev *bdev);
/* functions associated with a dir bdev struct */
static int dir_clonepaths(struct bdev *orig, struct bdev *new,
const char *oldname, const char *cname,
@ -1083,293 +1084,6 @@ static const struct bdev_ops loop_ops = {
.can_backup = true,
};
//
// aufs ops
//
static int aufs_detect(const char *path)
{
if (strncmp(path, "aufs:", 5) == 0)
return 1; // take their word for it
return 0;
}
//
// XXXXXXX plain directory bind mount ops
//
static int aufs_mount(struct bdev *bdev)
{
char *options, *dup, *lower, *upper;
int len;
unsigned long mntflags;
char *mntdata;
int ret;
const char *xinopath = "/dev/shm/aufs.xino";
if (strcmp(bdev->type, "aufs"))
return -22;
if (!bdev->src || !bdev->dest)
return -22;
// separately mount it first
// mount -t aufs -obr=${upper}=rw:${lower}=ro lower dest
dup = alloca(strlen(bdev->src)+1);
strcpy(dup, bdev->src);
if (!(lower = strchr(dup, ':')))
return -22;
if (!(upper = strchr(++lower, ':')))
return -22;
*upper = '\0';
upper++;
if (parse_mntopts(bdev->mntopts, &mntflags, &mntdata) < 0) {
free(mntdata);
return -22;
}
// TODO We should check whether bdev->src is a blockdev, and if so
// but for now, only support aufs of a basic directory
// AUFS does not work on top of certain filesystems like (XFS or Btrfs)
// so add xino=/dev/shm/aufs.xino parameter to mount options.
// The same xino option can be specified to multiple aufs mounts, and
// a xino file is not shared among multiple aufs mounts.
//
// see http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg02587.html
// http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05126.html
if (mntdata) {
len = strlen(lower) + strlen(upper) + strlen(xinopath) + strlen("br==rw:=ro,,xino=") + strlen(mntdata) + 1;
options = alloca(len);
ret = snprintf(options, len, "br=%s=rw:%s=ro,%s,xino=%s", upper, lower, mntdata, xinopath);
}
else {
len = strlen(lower) + strlen(upper) + strlen(xinopath) + strlen("br==rw:=ro,xino=") + 1;
options = alloca(len);
ret = snprintf(options, len, "br=%s=rw:%s=ro,xino=%s", upper, lower, xinopath);
}
if (ret < 0 || ret >= len) {
free(mntdata);
return -1;
}
ret = mount(lower, bdev->dest, "aufs", MS_MGC_VAL | mntflags, options);
if (ret < 0)
SYSERROR("aufs: error mounting %s onto %s options %s",
lower, bdev->dest, options);
else
INFO("aufs: mounted %s onto %s options %s",
lower, bdev->dest, options);
return ret;
}
static int aufs_umount(struct bdev *bdev)
{
if (strcmp(bdev->type, "aufs"))
return -22;
if (!bdev->src || !bdev->dest)
return -22;
return umount(bdev->dest);
}
static int aufs_clonepaths(struct bdev *orig, struct bdev *new,
const char *oldname, const char *cname,
const char *oldpath, const char *lxcpath, int snap,
uint64_t newsize, struct lxc_conf *conf)
{
if (!snap) {
ERROR("aufs is only for snapshot clones");
return -22;
}
if (!orig->src || !orig->dest)
return -1;
new->dest = dir_new_path(orig->dest, oldname, cname, oldpath, lxcpath);
if (!new->dest)
return -1;
if (mkdir_p(new->dest, 0755) < 0)
return -1;
if (am_unpriv() && chown_mapped_root(new->dest, conf) < 0)
WARN("Failed to update ownership of %s", new->dest);
if (strcmp(orig->type, "dir") == 0) {
char *delta, *lastslash;
int ret, len, lastslashidx;
// if we have /var/lib/lxc/c2/rootfs, then delta will be
// /var/lib/lxc/c2/delta0
lastslash = strrchr(new->dest, '/');
if (!lastslash)
return -22;
if (strlen(lastslash) < 7)
return -22;
lastslash++;
lastslashidx = lastslash - new->dest;
delta = malloc(lastslashidx + 7);
if (!delta)
return -1;
strncpy(delta, new->dest, lastslashidx+1);
strcpy(delta+lastslashidx, "delta0");
if ((ret = mkdir(delta, 0755)) < 0) {
SYSERROR("error: mkdir %s", delta);
free(delta);
return -1;
}
if (am_unpriv() && chown_mapped_root(delta, conf) < 0)
WARN("Failed to update ownership of %s", delta);
// the src will be 'aufs:lowerdir:upperdir'
len = strlen(delta) + strlen(orig->src) + 12;
new->src = malloc(len);
if (!new->src) {
free(delta);
return -ENOMEM;
}
ret = snprintf(new->src, len, "aufs:%s:%s", orig->src, delta);
free(delta);
if (ret < 0 || ret >= len)
return -ENOMEM;
} else if (strcmp(orig->type, "aufs") == 0) {
// What exactly do we want to do here?
// I think we want to use the original lowerdir, with a
// private delta which is originally rsynced from the
// original delta
char *osrc, *odelta, *nsrc, *ndelta;
int len, ret;
if (!(osrc = strdup(orig->src)))
return -22;
nsrc = strchr(osrc, ':') + 1;
if (nsrc != osrc + 5 || (odelta = strchr(nsrc, ':')) == NULL) {
free(osrc);
return -22;
}
*odelta = '\0';
odelta++;
ndelta = dir_new_path(odelta, oldname, cname, oldpath, lxcpath);
if (!ndelta) {
free(osrc);
return -ENOMEM;
}
if ((ret = mkdir(ndelta, 0755)) < 0 && errno != EEXIST) {
SYSERROR("error: mkdir %s", ndelta);
free(osrc);
free(ndelta);
return -1;
}
if (am_unpriv() && chown_mapped_root(ndelta, conf) < 0)
WARN("Failed to update ownership of %s", ndelta);
struct rsync_data_char rdata;
rdata.src = odelta;
rdata.dest = ndelta;
if (am_unpriv())
ret = userns_exec_1(conf, rsync_delta_wrapper, &rdata);
else
ret = rsync_delta(&rdata);
if (ret) {
free(osrc);
free(ndelta);
ERROR("copying aufs delta");
return -1;
}
len = strlen(nsrc) + strlen(ndelta) + 12;
new->src = malloc(len);
if (!new->src) {
free(osrc);
free(ndelta);
return -ENOMEM;
}
ret = snprintf(new->src, len, "aufs:%s:%s", nsrc, ndelta);
free(osrc);
free(ndelta);
if (ret < 0 || ret >= len)
return -ENOMEM;
} else {
ERROR("aufs clone of %s container is not yet supported",
orig->type);
// Note, supporting this will require aufs_mount supporting
// mounting of the underlay. No big deal, just needs to be done.
return -1;
}
return 0;
}
static int aufs_destroy(struct bdev *orig)
{
char *upper;
if (strncmp(orig->src, "aufs:", 5) != 0)
return -22;
upper = strchr(orig->src + 5, ':');
if (!upper)
return -22;
upper++;
return lxc_rmdir_onedev(upper, NULL);
}
/*
* to say 'lxc-create -t ubuntu -n o1 -B aufs' means you want
* $lxcpath/$lxcname/rootfs to have the created container, while all
* changes after starting the container are written to
* $lxcpath/$lxcname/delta0
*/
static int aufs_create(struct bdev *bdev, const char *dest, const char *n,
struct bdev_specs *specs)
{
char *delta;
int ret, len = strlen(dest), newlen;
if (len < 8 || strcmp(dest+len-7, "/rootfs") != 0)
return -1;
if (!(bdev->dest = strdup(dest))) {
ERROR("Out of memory");
return -1;
}
delta = alloca(strlen(dest)+1);
strcpy(delta, dest);
strcpy(delta+len-6, "delta0");
if (mkdir_p(delta, 0755) < 0) {
ERROR("Error creating %s", delta);
return -1;
}
/* aufs:lower:upper */
newlen = (2 * len) + strlen("aufs:") + 2;
bdev->src = malloc(newlen);
if (!bdev->src) {
ERROR("Out of memory");
return -1;
}
ret = snprintf(bdev->src, newlen, "aufs:%s:%s", dest, delta);
if (ret < 0 || ret >= newlen)
return -1;
if (mkdir_p(bdev->dest, 0755) < 0) {
ERROR("Error creating %s", bdev->dest);
return -1;
}
return 0;
}
static const struct bdev_ops aufs_ops = {
.detect = &aufs_detect,
.mount = &aufs_mount,
.umount = &aufs_umount,
.clone_paths = &aufs_clonepaths,
.destroy = &aufs_destroy,
.create = &aufs_create,
.can_snapshot = true,
.can_backup = true,
};
//
// nbd dev ops
//

308
src/lxc/bdev/lxcaufs.c Normal file
View File

@ -0,0 +1,308 @@
/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2008
*
* Authors:
* Daniel Lezcano <daniel.lezcano at free.fr>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _GNU_SOURCE
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "bdev.h"
#include "log.h"
#include "lxcrsync.h"
#include "utils.h"
lxc_log_define(lxcaufs, lxc);
/* the bulk of this needs to become a common helper */
extern char *dir_new_path(char *src, const char *oldname, const char *name,
const char *oldpath, const char *lxcpath);
int aufs_clonepaths(struct bdev *orig, struct bdev *new, const char *oldname,
const char *cname, const char *oldpath, const char *lxcpath,
int snap, uint64_t newsize, struct lxc_conf *conf)
{
if (!snap) {
ERROR("aufs is only for snapshot clones");
return -22;
}
if (!orig->src || !orig->dest)
return -1;
new->dest = dir_new_path(orig->dest, oldname, cname, oldpath, lxcpath);
if (!new->dest)
return -1;
if (mkdir_p(new->dest, 0755) < 0)
return -1;
if (am_unpriv() && chown_mapped_root(new->dest, conf) < 0)
WARN("Failed to update ownership of %s", new->dest);
if (strcmp(orig->type, "dir") == 0) {
char *delta, *lastslash;
int ret, len, lastslashidx;
// if we have /var/lib/lxc/c2/rootfs, then delta will be
// /var/lib/lxc/c2/delta0
lastslash = strrchr(new->dest, '/');
if (!lastslash)
return -22;
if (strlen(lastslash) < 7)
return -22;
lastslash++;
lastslashidx = lastslash - new->dest;
delta = malloc(lastslashidx + 7);
if (!delta)
return -1;
strncpy(delta, new->dest, lastslashidx+1);
strcpy(delta+lastslashidx, "delta0");
if ((ret = mkdir(delta, 0755)) < 0) {
SYSERROR("error: mkdir %s", delta);
free(delta);
return -1;
}
if (am_unpriv() && chown_mapped_root(delta, conf) < 0)
WARN("Failed to update ownership of %s", delta);
// the src will be 'aufs:lowerdir:upperdir'
len = strlen(delta) + strlen(orig->src) + 12;
new->src = malloc(len);
if (!new->src) {
free(delta);
return -ENOMEM;
}
ret = snprintf(new->src, len, "aufs:%s:%s", orig->src, delta);
free(delta);
if (ret < 0 || ret >= len)
return -ENOMEM;
} else if (strcmp(orig->type, "aufs") == 0) {
// What exactly do we want to do here?
// I think we want to use the original lowerdir, with a
// private delta which is originally rsynced from the
// original delta
char *osrc, *odelta, *nsrc, *ndelta;
int len, ret;
if (!(osrc = strdup(orig->src)))
return -22;
nsrc = strchr(osrc, ':') + 1;
if (nsrc != osrc + 5 || (odelta = strchr(nsrc, ':')) == NULL) {
free(osrc);
return -22;
}
*odelta = '\0';
odelta++;
ndelta = dir_new_path(odelta, oldname, cname, oldpath, lxcpath);
if (!ndelta) {
free(osrc);
return -ENOMEM;
}
if ((ret = mkdir(ndelta, 0755)) < 0 && errno != EEXIST) {
SYSERROR("error: mkdir %s", ndelta);
free(osrc);
free(ndelta);
return -1;
}
if (am_unpriv() && chown_mapped_root(ndelta, conf) < 0)
WARN("Failed to update ownership of %s", ndelta);
struct rsync_data_char rdata;
rdata.src = odelta;
rdata.dest = ndelta;
if (am_unpriv())
ret = userns_exec_1(conf, rsync_delta_wrapper, &rdata);
else
ret = rsync_delta(&rdata);
if (ret) {
free(osrc);
free(ndelta);
ERROR("copying aufs delta");
return -1;
}
len = strlen(nsrc) + strlen(ndelta) + 12;
new->src = malloc(len);
if (!new->src) {
free(osrc);
free(ndelta);
return -ENOMEM;
}
ret = snprintf(new->src, len, "aufs:%s:%s", nsrc, ndelta);
free(osrc);
free(ndelta);
if (ret < 0 || ret >= len)
return -ENOMEM;
} else {
ERROR("aufs clone of %s container is not yet supported",
orig->type);
// Note, supporting this will require aufs_mount supporting
// mounting of the underlay. No big deal, just needs to be done.
return -1;
}
return 0;
}
/*
* to say 'lxc-create -t ubuntu -n o1 -B aufs' means you want
* $lxcpath/$lxcname/rootfs to have the created container, while all
* changes after starting the container are written to
* $lxcpath/$lxcname/delta0
*/
int aufs_create(struct bdev *bdev, const char *dest, const char *n,
struct bdev_specs *specs)
{
char *delta;
int ret, len = strlen(dest), newlen;
if (len < 8 || strcmp(dest+len-7, "/rootfs") != 0)
return -1;
if (!(bdev->dest = strdup(dest))) {
ERROR("Out of memory");
return -1;
}
delta = alloca(strlen(dest)+1);
strcpy(delta, dest);
strcpy(delta+len-6, "delta0");
if (mkdir_p(delta, 0755) < 0) {
ERROR("Error creating %s", delta);
return -1;
}
/* aufs:lower:upper */
newlen = (2 * len) + strlen("aufs:") + 2;
bdev->src = malloc(newlen);
if (!bdev->src) {
ERROR("Out of memory");
return -1;
}
ret = snprintf(bdev->src, newlen, "aufs:%s:%s", dest, delta);
if (ret < 0 || ret >= newlen)
return -1;
if (mkdir_p(bdev->dest, 0755) < 0) {
ERROR("Error creating %s", bdev->dest);
return -1;
}
return 0;
}
int aufs_destroy(struct bdev *orig)
{
char *upper;
if (strncmp(orig->src, "aufs:", 5) != 0)
return -22;
upper = strchr(orig->src + 5, ':');
if (!upper)
return -22;
upper++;
return lxc_rmdir_onedev(upper, NULL);
}
int aufs_detect(const char *path)
{
if (strncmp(path, "aufs:", 5) == 0)
return 1; // take their word for it
return 0;
}
int aufs_mount(struct bdev *bdev)
{
char *options, *dup, *lower, *upper;
int len;
unsigned long mntflags;
char *mntdata;
int ret;
const char *xinopath = "/dev/shm/aufs.xino";
if (strcmp(bdev->type, "aufs"))
return -22;
if (!bdev->src || !bdev->dest)
return -22;
// separately mount it first
// mount -t aufs -obr=${upper}=rw:${lower}=ro lower dest
dup = alloca(strlen(bdev->src)+1);
strcpy(dup, bdev->src);
if (!(lower = strchr(dup, ':')))
return -22;
if (!(upper = strchr(++lower, ':')))
return -22;
*upper = '\0';
upper++;
if (parse_mntopts(bdev->mntopts, &mntflags, &mntdata) < 0) {
free(mntdata);
return -22;
}
// TODO We should check whether bdev->src is a blockdev, and if so
// but for now, only support aufs of a basic directory
// AUFS does not work on top of certain filesystems like (XFS or Btrfs)
// so add xino=/dev/shm/aufs.xino parameter to mount options.
// The same xino option can be specified to multiple aufs mounts, and
// a xino file is not shared among multiple aufs mounts.
//
// see http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg02587.html
// http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg05126.html
if (mntdata) {
len = strlen(lower) + strlen(upper) + strlen(xinopath) + strlen("br==rw:=ro,,xino=") + strlen(mntdata) + 1;
options = alloca(len);
ret = snprintf(options, len, "br=%s=rw:%s=ro,%s,xino=%s", upper, lower, mntdata, xinopath);
}
else {
len = strlen(lower) + strlen(upper) + strlen(xinopath) + strlen("br==rw:=ro,xino=") + 1;
options = alloca(len);
ret = snprintf(options, len, "br=%s=rw:%s=ro,xino=%s", upper, lower, xinopath);
}
if (ret < 0 || ret >= len) {
free(mntdata);
return -1;
}
ret = mount(lower, bdev->dest, "aufs", MS_MGC_VAL | mntflags, options);
if (ret < 0)
SYSERROR("aufs: error mounting %s onto %s options %s",
lower, bdev->dest, options);
else
INFO("aufs: mounted %s onto %s options %s",
lower, bdev->dest, options);
return ret;
}
int aufs_umount(struct bdev *bdev)
{
if (strcmp(bdev->type, "aufs"))
return -22;
if (!bdev->src || !bdev->dest)
return -22;
return umount(bdev->dest);
}

52
src/lxc/bdev/lxcaufs.h Normal file
View File

@ -0,0 +1,52 @@
/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2008
*
* Authors:
* Daniel Lezcano <daniel.lezcano at free.fr>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __LXC_AUFS_H
#define __LXC_AUFS_H
#define _GNU_SOURCE
#include <stdint.h>
/* defined in bdev.h */
struct bdev;
/* defined in lxccontainer.h */
struct bdev_specs;
/* defined conf.h */
struct lxc_conf;
/*
* Functions associated with an aufs bdev struct.
*/
int aufs_clonepaths(struct bdev *orig, struct bdev *new, const char *oldname,
const char *cname, const char *oldpath, const char *lxcpath,
int snap, uint64_t newsize, struct lxc_conf *conf);
int aufs_create(struct bdev *bdev, const char *dest, const char *n,
struct bdev_specs *specs);
int aufs_destroy(struct bdev *orig);
int aufs_detect(const char *path);
int aufs_mount(struct bdev *bdev);
int aufs_umount(struct bdev *bdev);
#endif /* __LXC_AUFS_H */