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authorDavid Woodhouse <dwmw2@infradead.org>2008-02-06 01:36:27 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 10:41:01 -0800
commit96c5865559cee0f9cbc5173f3c949f6ce3525581 (patch)
treebbcfa89faeae5e5b1334a8f537b6bdb7caa992d8 /include/linux/loop.h
parenta3b81113fb6658629f4ebaabf8dd3067cd341020 (diff)
downloadop-kernel-dev-96c5865559cee0f9cbc5173f3c949f6ce3525581.zip
op-kernel-dev-96c5865559cee0f9cbc5173f3c949f6ce3525581.tar.gz
Allow auto-destruction of loop devices
This allows a flag to be set on loop devices so that when they are closed for the last time, they'll self-destruct. In general, so that we can automatically allocate loop devices (as with losetup -f) and have them disappear when we're done with them. In particular, right now, so that we can stop relying on the hackish special-case in umount(8) which kills off loop devices which were set up by 'mount -oloop'. That means we can stop putting crap in /etc/mtab which doesn't belong there, which means it can be a symlink to /proc/mounts, which means yet another writable file on the root filesystem is eliminated and the 'stateless' folks get happier... and OLPC trac #356 can be closed. The mount(8) side of that is at http://marc.info/?l=util-linux-ng&m=119362955431694&w=2 [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: David Woodhouse <dwmw2@infradead.org> Cc: Bernardo Innocenti <bernie@codewiz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/loop.h')
-rw-r--r--include/linux/loop.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/loop.h b/include/linux/loop.h
index 26a0a10..46169a7 100644
--- a/include/linux/loop.h
+++ b/include/linux/loop.h
@@ -76,6 +76,7 @@ struct loop_device {
enum {
LO_FLAGS_READ_ONLY = 1,
LO_FLAGS_USE_AOPS = 2,
+ LO_FLAGS_AUTOCLEAR = 4,
};
#include <asm/posix_types.h> /* for __kernel_old_dev_t */
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