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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-28 08:29:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-28 08:29:56 -0700
commitfcbf94b9dedd2ce08e798a99aafc94fec8668161 (patch)
treebc81982bbcf96538a09103b2c722ac7d2c99bdef /fs/autofs4/autofs_i.h
parentMerge git://git.samba.org/sfrench/cifs-2.6 (diff)
downloadlinux-dev-fcbf94b9dedd2ce08e798a99aafc94fec8668161.tar.xz
linux-dev-fcbf94b9dedd2ce08e798a99aafc94fec8668161.zip
Revert "autofs: work around unhappy compat problem on x86-64"
This reverts commit a32744d4abae24572eff7269bc17895c41bd0085. 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>
Diffstat (limited to 'fs/autofs4/autofs_i.h')
-rw-r--r--fs/autofs4/autofs_i.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index eb1cc92cd67d..d8d8e7ba6a1e 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -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;