linux-toradex.git/include/linux/quota.h, branch tegra-9.12.15

quota: decouple fs reserved space from quota reservation

2010-01-06T23:05:03+00:00

commit fd8fbfc1709822bd94247c5b2ab15a5f5041e103 upstream.

Currently inode_reservation is managed by fs itself and this
reservation is transfered on dquot_transfer(). This means what
inode_reservation must always be in sync with
dquot->dq_dqb.dqb_rsvspace. Otherwise dquot_transfer() will result
in incorrect quota(WARN_ON in dquot_claim_reserved_space() will be
triggered)
This is not easy because of complex locking order issues
for example http://bugzilla.kernel.org/show_bug.cgi?id=14739

The patch introduce quota reservation field for each fs-inode
(fs specific inode is used in order to prevent bloating generic
vfs inode). This reservation is managed by quota code internally
similar to i_blocks/i_bytes and may not be always in sync with
internal fs reservation.

Also perform some code rearrangement:
- Unify dquot_reserve_space() and dquot_reserve_space()
- Unify dquot_release_reserved_space() and dquot_free_space()
- Also this patch add missing warning update to release_rsv()
  dquot_release_reserved_space() must call flush_warnings() as
  dquot_free_space() does.

Signed-off-by: Dmitry Monakhov 
Signed-off-by: Jan Kara 
Signed-off-by: Greg Kroah-Hartman

quota: Remove NODQUOT macro

2009-03-26T01:18:35+00:00

Remove this macro which is just a definition of NULL. Fix a few coding style
issues along the way.

Signed-off-by: Jan Kara

quota: Add quota reservation claim and released operations

2009-03-26T01:18:24+00:00

Reserved quota will be claimed at the block allocation time. Over-booked
quota could be returned back with the release callback function.

Signed-off-by: Mingming Cao 
Signed-off-by: Jan Kara

quota: Add quota reservation support

2009-03-26T01:15:50+00:00

Delayed allocation defers the block allocation at the dirty pages
flush-out time, doing quota charge/check at that time is too late.
But we can't charge the quota blocks until blocks are really allocated,
otherwise users could get overcharged after reboot from system crash.

This patch adds quota reservation for delayed allocation. Quota blocks
are reserved in memory, inode and quota won't gets dirtied until later
block allocation time.

Signed-off-by: Mingming Cao 
Signed-off-by: Jan Kara

quota: Unexport dqblk_v1.h and dqblk_v2.h

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

Unexport header files dqblk_v[12].h since except for quota format ID they
don't contain information userspace should be interested in. Move ID
definitions to quota.h.

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

quota: Update version number

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

Increase reported version number of quota support since quota core has changed
significantly. Also remove __DQUOT_NUM_VERSION__ since nobody uses it.

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

quota: Keep which entries were set by SETQUOTA quotactl

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

Quota in a clustered environment needs to synchronize quota information
among cluster nodes. This means we have to occasionally update some
information in dquot from disk / network. On the other hand we have to
be careful not to overwrite changes administrator did via SETQUOTA.
So indicate in dquot->dq_flags which entries have been set by SETQUOTA
and quota format can clear these flags when it properly propagated
the changes.

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

quota: Allow negative usage of space and inodes

2009-01-05T16:40:21+00:00

For clustered filesystems, it can happen that space / inode usage goes
negative temporarily (because some node is allocating another node
is freeing and they are not completely in sync). So let quota code
allow this and change qsize_t so a signed type so that we don't
underflow the variables.

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

quota: Convert union in mem_dqinfo to a pointer

2009-01-05T16:40:21+00:00

Coming quota support for OCFS2 is going to need quite a bit
of additional per-sb quota information. Moreover having fs.h
include all the types needed for this structure would be a
pain in the a**. So remove the union from mem_dqinfo and add
a private pointer for filesystem's use.

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

quota: Introduce DQUOT_QUOTA_SYS_FILE flag

2009-01-05T16:36:57+00:00

If filesystem can handle quota files as system files hidden from users, we can
skip a lot of cache invalidation, syncing, inode flags setting etc. when
turning quotas on, off and quota_sync. Allow filesystem to indicate that it is
hiding quota files from users by DQUOT_QUOTA_SYS_FILE flag.

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