linux-toradex.git/include/linux/quotaops.h, branch tegra-9.12.13

quota: Improve locking

2009-01-16T17:02:10+00:00

We implement dqget() and dqput() that need neither dqonoff_mutex nor dqptr_sem.
Then move dqget() and dqput() calls so that they are not called from under
dqptr_sem. This is important because filesystem callbacks aren't called from
under dqptr_sem which used to cause *lots* of problems with lock ranking
(and with OCFS2 they became close to unsolvable).

The patch also removes two functions which were introduced solely because OCFS2
needed them to cope with the old locking scheme. As time showed, they were not
enough for OCFS2 anyway and it would be unnecessary work to adapt them to the
new locking scheme in which they aren't needed.  As a result OCFS2 needs the
following patch to compile properly with quotas.  Sorry to any bisecters which
hit this in advance.

Signed-off-by: Jan Kara

quota: Export dquot_alloc() and dquot_destroy() functions

2009-01-05T16:40:25+00:00

These are default functions for creating and destroying quota structures
and they should be used from filesystems.

Signed-off-by: Jan Kara 
Signed-off-by: Mark Fasheh

quota: Implement function for scanning active dquots

2009-01-05T16:40:23+00:00

OCFS2 needs to scan all active dquots once in a while and sync quota
information among cluster nodes. Provide a helper function for it so
that it does not have to reimplement internally a list which VFS
already has. Moreover this function is probably going to be useful
for other clustered filesystems if they decide to use VFS quotas.

Signed-off-by: Jan Kara 
Signed-off-by: Mark Fasheh

quota: Add helpers to allow ocfs2 specific quota initialization, freeing and recovery

2009-01-05T16:40:22+00:00

OCFS2 needs to peek whether quota structure is already in memory so
that it can avoid expensive cluster locking in that case. Similarly
when freeing dquots, it checks whether it is the last quota structure
user or not. Finally, it needs to get reference to dquot structure for
specified id and quota type when recovering quota file after crash.

Signed-off-by: Jan Kara 
Signed-off-by: Mark Fasheh

quota: Remove compatibility function sb_any_quota_enabled()

2009-01-05T16:36:56+00:00

Signed-off-by: Jan Kara 
Signed-off-by: Mark Fasheh

quota: Allow to separately enable quota accounting and enforcing limits

2009-01-05T16:36:56+00:00

Split DQUOT_USR_ENABLED (and DQUOT_GRP_ENABLED) into DQUOT_USR_USAGE_ENABLED
and DQUOT_USR_LIMITS_ENABLED. This way we are able to separately enable /
disable whether we should:
1) ignore quotas completely
2) just keep uptodate information about usage
3) actually enforce quota limits

This is going to be useful when quota is treated as filesystem metadata - we
then want to keep quota information uptodate all the time and just enable /
disable limits enforcement.

Signed-off-by: Jan Kara 
Signed-off-by: Mark Fasheh

quota: Make _SUSPENDED just a flag

2009-01-05T16:36:56+00:00

Upto now, DQUOT_USR_SUSPENDED behaved like a state - i.e., either quota
was enabled or suspended or none. Now allowed states are 0, ENABLED,
ENABLED | SUSPENDED. This will be useful later when we implement separate
enabling of quota usage tracking and limits enforcement because we need to
keep track of a state which has been suspended.

Signed-off-by: Jan Kara 
Signed-off-by: Mark Fasheh

quota: Increase size of variables for limits and inode usage

2009-01-05T16:36:55+00:00

So far quota was fine with quota block limits and inode limits/numbers in
a 32-bit type. Now with rapid increase in storage sizes there are coming
requests to be able to handle quota limits above 4TB / more that 2^32 inodes.
So bump up sizes of types in mem_dqblk structure to 64-bits to be able to
handle this. Also update inode allocation / checking functions to use qsize_t
and make global structure keep quota limits in bytes so that things are
consistent.

Signed-off-by: Jan Kara 
Signed-off-by: Mark Fasheh

quota: remove CVS keywords

2008-10-16T18:21:46+00:00

Remove CVS keywords that weren't updated for a long time from comments.

Signed-off-by: Adrian Bunk 
Acked-by: Jan Kara 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] fix races and leaks in vfs_quota_on() users

2008-08-01T15:25:25+00:00

* new helper: vfs_quota_on_path(); equivalent of vfs_quota_on() sans the
  pathname resolution.
* callers of vfs_quota_on() that do their own pathname resolution and
  checks based on it are switched to vfs_quota_on_path(); that way we
  avoid the races.
* reiserfs leaked dentry/vfsmount references on several failure exits.

Signed-off-by: Al Viro