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ccf370e43e
linux/fs/quota
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Jan Kara ccf370e43e quota: Forbid Q_GETQUOTA and Q_GETNEXTQUOTA for frozen filesystem 
Commit 7955118eaf (quota: Allow Q_GETQUOTA for frozen filesystem)
allowed Q_GETQUOTA call for frozen filesystem. It makes sense on the
first look but zero-day testing has shown that with this change ext4
warns about starting a transaction for frozen filesystem. This happens
because ext4_acquire_dquot() prepares for allocating space for new quota
structure. Although it would be possible to implement Q_GETQUOTA for
ext4 without allocating space for non-existent structures, the matter
further complicates because OCFS2 needs to update on-disk structure use
count when a new cluster node loads quota information from disk. So just
revert the change and forbid Q_GETQUOTA together with Q_GETNEXTQUOTA for
frozen filesystem. Add comment to quotactl_cmd_write() to save us from
repeating this excercise in a few years when I forget again.

Signed-off-by: Jan Kara <jack@suse.cz>
2016-02-18 14:03:03 +01:00
..
compat.c quota: split out compat_sys_quotactl support from quota.c 2010-03-05 00:20:25 +01:00
dquot.c quota: Fix possible races during quota loading 2016-02-18 13:34:41 +01:00
Kconfig rcu: Make SRCU optional by using CONFIG_SRCU 2015-01-06 11:04:29 -08:00
kqid.c fs/quota: kernel-doc warning fixes 2014-07-15 22:40:23 +02:00
Makefile userns: Implement struct kqid 2012-09-18 01:01:38 -07:00
netlink.c fs: make quota/netlink.c explicitly non-modular 2015-12-14 12:04:34 +01:00
quota_tree.c quota_v2: Implement get_next_id() for V2 quota format 2016-02-09 13:05:23 +01:00
quota_tree.h quota: Change quota error message to print out disk and function name 2010-07-21 16:05:58 +02:00
quota_v1.c quota: Store maximum space limit in bytes 2015-01-30 12:51:21 +01:00
quota_v2.c quota_v2: Implement get_next_id() for V2 quota format 2016-02-09 13:05:23 +01:00
quota.c quota: Forbid Q_GETQUOTA and Q_GETNEXTQUOTA for frozen filesystem 2016-02-18 14:03:03 +01:00
quotaio_v1.h
quotaio_v2.h vfs: Add general support to enforce project quota limits 2015-03-18 21:55:08 +01:00