The patch titled
Allow auto-destruction of loop devices
has been added to the -mm tree. Its filename is
allow-auto-destruction-of-loop-devices.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Allow auto-destruction of loop devices
From: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
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
Signed-off-by: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Bernardo Innocenti <bernie@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/loop.c | 8 ++++++++
include/linux/loop.h | 1 +
2 files changed, 9 insertions(+)
diff -puN drivers/block/loop.c~allow-auto-destruction-of-loop-devices drivers/block/loop.c
--- a/drivers/block/loop.c~allow-auto-destruction-of-loop-devices
+++ a/drivers/block/loop.c
@@ -973,6 +973,10 @@ loop_set_status(struct loop_device *lo,
lo->transfer = xfer->transfer;
lo->ioctl = xfer->ioctl;
+ if ( (lo->lo_flags & LO_FLAGS_AUTOCLEAR) !=
+ (info->lo_flags & LO_FLAGS_AUTOCLEAR))
+ lo->lo_flags ^= LO_FLAGS_AUTOCLEAR;
+
lo->lo_encrypt_key_size = info->lo_encrypt_key_size;
lo->lo_init[0] = info->lo_init[0];
lo->lo_init[1] = info->lo_init[1];
@@ -1331,6 +1335,10 @@ static int lo_release(struct inode *inod
mutex_lock(&lo->lo_ctl_mutex);
--lo->lo_refcnt;
+
+ if ((lo->lo_flags & LO_FLAGS_AUTOCLEAR) && !lo->lo_refcnt)
+ loop_clr_fd(lo, inode->i_bdev);
+
mutex_unlock(&lo->lo_ctl_mutex);
return 0;
diff -puN include/linux/loop.h~allow-auto-destruction-of-loop-devices include/linux/loop.h
--- a/include/linux/loop.h~allow-auto-destruction-of-loop-devices
+++ a/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 */
_
Patches currently in -mm which might be from dwmw2@xxxxxxxxxxxxx are
origin.patch
git-mtd.patch
eccbuf-is-statically-defined-and-always-evaluate-to-true.patch
remove-fs-jffs2-ioctlc.patch
remove-support-for-un-needed-_extratext-section.patch
remove-support-for-un-needed-_extratext-section-checkpatch-fixes.patch
allow-auto-destruction-of-loop-devices.patch
iget-stop-jffs2-from-using-iget-and-read_inode.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
