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authorAl Viro <viro@zeniv.linux.org.uk>2005-11-07 17:13:39 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 21:18:09 -0500
commit7b7b1ace2d9d06d76bce7481a045c22ed75e35dd (patch)
tree458f9f16b855ed0347013048c13d3a29031f00ee /fs/super.c
parent254ce8dc882f8d69e5d49ed4807c94a61976fb15 (diff)
[PATCH] saner handling of auto_acct_off() and DQUOT_OFF() in umount
The way we currently deal with quota and process accounting that might keep vfsmount busy at umount time is inherently broken; we try to turn them off just in case (not quite correctly, at that) and a) pray umount doesn't fail (otherwise they'll stay turned off) b) pray nobody doesn anything funny just as we turn quota off Moreover, LSM provides hooks for doing the same sort of broken logics. The proper way to deal with that is to introduce the second kind of reference to vfsmount. Semantics: - when the last normal reference is dropped, all special ones are converted to normal ones and if there had been any, cleanup is done. - normal reference can be cloned into a special one - special reference can be converted to normal one; that's a no-op if we'd already passed the point of no return (i.e. mntput() had converted special references to normal and started cleanup). The way it works: e.g. starting process accounting converts the vfsmount reference pinned by the opened file into special one and turns it back to normal when it gets shut down; acct_auto_close() is done when no normal references are left. That way it does *not* obstruct umount(2) and it silently gets turned off when the last normal reference to vfsmount is gone. Which is exactly what we want... The same should be done by LSM module that holds some internal references to vfsmount and wants to shut them down on umount - it should make them special and security_sb_umount_close() will be called exactly when the last normal reference to vfsmount is gone. quota handling is even simpler - we don't use normal file IO anymore, so there's no need to hold vfsmounts at all. DQUOT_OFF() is done from deactivate_super(), where it really belongs. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index eed6c3132905..6689dded3c84 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -171,6 +171,7 @@ void deactivate_super(struct super_block *s)
171 if (atomic_dec_and_lock(&s->s_active, &sb_lock)) { 171 if (atomic_dec_and_lock(&s->s_active, &sb_lock)) {
172 s->s_count -= S_BIAS-1; 172 s->s_count -= S_BIAS-1;
173 spin_unlock(&sb_lock); 173 spin_unlock(&sb_lock);
174 DQUOT_OFF(s);
174 down_write(&s->s_umount); 175 down_write(&s->s_umount);
175 fs->kill_sb(s); 176 fs->kill_sb(s);
176 put_filesystem(fs); 177 put_filesystem(fs);