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freezer: do not sync filesystems from freeze_processes

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The syncing of filesystems from within the freezer is generally not needed.
Also, if there's an ext3 filesystem loopback-mounted from a FUSE one, the
syncing results in writes to it and deadlocks.  Similarly, it will deadlock if
FUSE implements sync.

Change freeze_processes() so that it doesn't execute sys_sync() and make the
suspend and hibernation code path sync filesystems independently of the
freezer.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki
2007-10-18 03:04:44 -07:00
committed by Linus Torvalds
parent 2776365370
commit 232b143280
4 changed files with 14 additions and 1 deletions
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4
kernel/power/user.c
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@ -153,6 +153,10 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
mutex_lock(&pm_mutex);
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
if (!error) {
printk("Syncing filesystems ... ");
sys_sync();
printk("done.\n");
error = freeze_processes();
if (error)
thaw_processes();