linux-toradex.git/include/linux/quota.h, branch v5.12-rc5

fs/quota: update quota state flags scheme with project quota flags

2020-11-03T10:16:04+00:00

Current quota state flags scheme doesn't include project quota and thus
shows all flags after DQUOT_USAGE_ENABLED wrong. Fix this and also add
DQUOT_NOLIST_DIRTY to the scheme.

Link: https://lore.kernel.org/r/1602989814-28922-1-git-send-email-dotdot@yandex-team.ru
Signed-off-by: Roman Anufriev 
Signed-off-by: Jan Kara

fs/quota: handle overflows of sysctl fs.quota.* and report as unsigned long

2019-11-11T10:06:27+00:00

Quota statistics counted as 64-bit per-cpu counter. Reading sums per-cpu
fractions as signed 64-bit int, filters negative values and then reports
lower half as signed 32-bit int.

Result may looks like:

fs.quota.allocated_dquots = 22327
fs.quota.cache_hits = -489852115
fs.quota.drops = -487288718
fs.quota.free_dquots = 22083
fs.quota.lookups = -486883485
fs.quota.reads = 22327
fs.quota.syncs = 335064
fs.quota.writes = 3088689

Values bigger than 2^31-1 reported as negative.

All counters except "allocated_dquots" and "free_dquots" are monotonic,
thus they should be reported as is without filtering negative values.

Kernel doesn't have generic helper for 64-bit sysctl yet,
let's use at least unsigned long.

Link: https://lore.kernel.org/r/157337934693.2078.9842146413181153727.stgit@buzz
Signed-off-by: Konstantin Khlebnikov 
Signed-off-by: Jan Kara

fs/quota: Replace XQM_MAXQUOTAS usage with MAXQUOTAS

2018-08-22T16:17:29+00:00

XQM_MAXQUOTAS and MAXQUOTAS are, it appears, equivalent. Replace all
usage of XQM_MAXQUOTAS and remove it along with the unused XQM_*QUOTA
definitions.

Signed-off-by: Jeremy Cline 
Signed-off-by: Jan Kara

quota: Kill an unused extern entry form quota.h

2018-03-26T11:11:35+00:00

Kill an unused extern entry from quota.h
which is leftover of below patch.

[f32764bd2: quota: Convert quota statistics to generic percpu_counter]

Signed-off-by: Ritesh Harjani 
Signed-off-by: Jan Kara

quota: Add lock annotations to struct members

2017-08-21T12:06:46+00:00

Add annotation which lock protects which struct members to struct dquot
and struct mem_dqinfo.

Signed-off-by: Jan Kara

quota: Reduce contention on dq_data_lock

2017-08-17T20:07:59+00:00

dq_data_lock is currently used to protect all modifications of quota
accounting information, consistency of quota accounting on the inode,
and dquot pointers from inode. As a result contention on the lock can be
pretty heavy.

Reduce the contention on the lock by protecting quota accounting
information by a new dquot->dq_dqb_lock and consistency of quota
accounting with inode usage by inode->i_lock.

This change reduces time to create 500000 files on ext4 on ramdisk by 50
different processes in separate directories by 6% when user quota is
turned on. When those 50 processes belong to 50 different users, the
improvement is about 9%.

Signed-off-by: Jan Kara

quota: Allow disabling tracking of dirty dquots in a list

2017-08-17T20:00:45+00:00

Filesystems that are journalling quotas generally don't need tracking of
dirty dquots in a list since forcing a transaction commit flushes all
quotas anyway. Allow filesystem to say it doesn't want dquots to be
tracked as it reduces contention on the dq_list_lock.

Signed-off-by: Jan Kara

quota: Remove dq_wait_unused from dquot

2017-08-17T20:00:40+00:00

Currently every dquot carries a wait_queue_head_t used only when we are
turning quotas off to wait for last users to drop dquot references.
Since such rare case is not performance sensitive in any means, just use
a global waitqueue for this and save space in struct dquot. Also convert
the logic to use wait_event() instead of open-coding it.

Signed-off-by: Jan Kara

quota: Convert dqio_mutex to rwsem

2017-08-17T16:52:48+00:00

Convert dqio_mutex to rwsem and call it dqio_sem. No functional changes
yet.

Signed-off-by: Jan Kara

quota: add get_inode_usage callback to transfer multi-inode charges

2017-06-22T15:46:48+00:00

Ext4 ea_inode feature allows storing xattr values in external inodes to
be able to store values that are bigger than a block in size. Ext4 also
has deduplication support for these type of inodes. With deduplication,
the actual storage waste is eliminated but the users of such inodes are
still charged full quota for the inodes as if there was no sharing
happening in the background.

This design requires ext4 to manually charge the users because the
inodes are shared.

An implication of this is that, if someone calls chown on a file that
has such references we need to transfer the quota for the file and xattr
inodes. Current dquot_transfer() function implicitly transfers one inode
charge. With ea_inode feature, we would like to transfer multiple inode
charges.

Add get_inode_usage callback which can interrogate the total number of
inodes that were charged for a given inode.

[ Applied fix from Colin King to make sure the 'ret' variable is
  initialized on the successful return path.  Detected by
  CoverityScan, CID#1446616 ("Uninitialized scalar variable") --tytso]

Signed-off-by: Tahsin Erdogan 
Signed-off-by: Theodore Ts'o 
Signed-off-by: Colin Ian King 
Acked-by: Jan Kara