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Revert "autofs: work around unhappy compat problem on x86-64" 

This reverts commit a32744d4ab.

While that commit was technically the right thing to do, and made the
x86-64 compat mode work identically to native 32-bit mode (and thus
fixing the problem with a 32-bit systemd install on a 64-bit kernel), it
turns out that the automount binaries had workarounds for this compat
problem.

Now, the workarounds are disgusting: doing an "uname()" to find out the
architecture of the kernel, and then comparing it for the 64-bit cases
and fixing up the size of the read() in automount for those.  And they
were confused: it's not actually a generic 64-bit issue at all, it's
very much tied to just x86-64, which has different alignment for an
'u64' in 64-bit mode than in 32-bit mode.

But the end result is that fixing the compat layer actually breaks the
case of a 32-bit automount on a x86-64 kernel.

There are various approaches to fix this (including just doing a
"strcmp()" on current->comm and comparing it to "automount"), but I
think that I will do the one that teaches pipes about a special "packet
mode", which will allow user space to not have to care too deeply about
the padding at the end of the autofs packet.

That change will make the compat workaround unnecessary, so let's revert
it first, and get automount working again in compat mode.  The
packetized pipes will then fix autofs for systemd.

Reported-and-requested-by: Michael Tokarev <mjt@tls.msk.ru>
Cc: Ian Kent <raven@themaw.net>
Cc: stable@kernel.org # for 3.3
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-04-28 08:29:56 -07:00
parent c629eaf839
commit fcbf94b9de
4 changed files with 3 additions and 23 deletions
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1
fs/autofs4/autofs_i.h
View File

@ -110,7 +110,6 @@ struct autofs_sb_info {
int sub_version;
int min_proto;
int max_proto;
int compat_daemon;
unsigned long exp_timeout;
unsigned int type;
int reghost_enabled;

1
fs/autofs4/dev-ioctl.c
View File

@ -385,7 +385,6 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
sbi->pipefd = pipefd;
sbi->pipe = pipe;
sbi->catatonic = 0;
sbi->compat_daemon = is_compat_task();
}
out:
mutex_unlock(&sbi->wq_mutex);

2
fs/autofs4/inode.c
View File

@ -19,7 +19,6 @@
#include <linux/parser.h>
#include <linux/bitops.h>
#include <linux/magic.h>
#include <linux/compat.h>
#include "autofs_i.h"
#include <linux/module.h>
@ -225,7 +224,6 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
set_autofs_type_indirect(&sbi->type);
sbi->min_proto = 0;
sbi->max_proto = 0;
sbi->compat_daemon = is_compat_task();
mutex_init(&sbi->wq_mutex);
mutex_init(&sbi->pipe_mutex);
spin_lock_init(&sbi->fs_lock);

22
fs/autofs4/waitq.c
View File

@ -91,24 +91,7 @@ static int autofs4_write(struct autofs_sb_info *sbi,
return (bytes > 0);
}
/*
* The autofs_v5 packet was misdesigned.
*
* The packets are identical on x86-32 and x86-64, but have different
* alignment. Which means that 'sizeof()' will give different results.
* Fix it up for the case of running 32-bit user mode on a 64-bit kernel.
*/
static noinline size_t autofs_v5_packet_size(struct autofs_sb_info *sbi)
{
size_t pktsz = sizeof(struct autofs_v5_packet);
#if defined(CONFIG_X86_64) && defined(CONFIG_COMPAT)
if (sbi->compat_daemon > 0)
pktsz -= 4;
#endif
return pktsz;
}
static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
struct autofs_wait_queue *wq,
int type)
@ -172,7 +155,8 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
{
struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet;
pktsz = autofs_v5_packet_size(sbi);
pktsz = sizeof(*packet);
packet->wait_queue_token = wq->wait_queue_token;
packet->len = wq->name.len;
memcpy(packet->name, wq->name.name, wq->name.len);