Hi.
Oliver Neukum wrote:
> Am Donnerstag 03 Januar 2008 schrieb Nigel Cunningham:
>> On top of this, I made a (too simple at the moment) freeze_filesystems
>> function which iterates through &super_blocks in reverse order, freezing
>> fuse filesystems or ordinary ones. I say 'too simple' because it doesn't
>> currently allow for the possibility of someone mounting (say) ext3 on
>> fuse, but that would just be an extension of what's already done.
>
> How do you deal with fuse server tasks using other fuse filesystems?
Since they're frozen in reverse order, the dependant one would be frozen
first.
> How does freeze_filesystems() look?
Removing my ugly debugging statements, it's currently:
/**
* freeze_filesystems - lock all filesystems and force them into a
consistent
* state
*/
void freeze_filesystems(int which)
{
struct super_block *sb;
lockdep_off();
/*
* Freeze in reverse order so filesystems dependant upon others are
* frozen in the right order (eg. loopback on ext3).
*/
list_for_each_entry_reverse(sb, &super_blocks, s_list) {
if (sb->s_type->fs_flags & FS_IS_FUSE &&
sb->s_frozen == SB_UNFROZEN &&
which & FS_FREEZER_FUSE) {
sb->s_frozen = SB_FREEZE_TRANS;
sb->s_flags |= MS_FROZEN;
continue;
}
if (!sb->s_root || !sb->s_bdev ||
(sb->s_frozen == SB_FREEZE_TRANS) ||
(sb->s_flags & MS_RDONLY) ||
(sb->s_flags & MS_FROZEN) ||
!(which & FS_FREEZER_NORMAL))
continue;
freeze_bdev(sb->s_bdev);
sb->s_flags |= MS_FROZEN;
}
lockdep_on();
}
Nigel
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