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Subject[PATCH 25/56] ocfs2: Implement quota syncing thread
Date
From: Jan Kara <jack@suse.cz>

This patch implements functions and timer setup which handles periodic
syncing of locally cached quota information to global quota file.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
fs/ocfs2/quota.h | 3 ++
fs/ocfs2/quota_global.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/quota_local.c | 4 ++
3 files changed, 78 insertions(+), 0 deletions(-)
diff --git a/fs/ocfs2/quota.h b/fs/ocfs2/quota.h
index 1f1c863..11cdff1 100644
--- a/fs/ocfs2/quota.h
+++ b/fs/ocfs2/quota.h
@@ -14,6 +14,7 @@
#include <linux/quota.h>
#include <linux/list.h>
#include <linux/dqblk_qtree.h>
+#include <linux/timer.h>

#include "ocfs2.h"

@@ -39,6 +40,7 @@ struct ocfs2_mem_dqinfo {
unsigned int dqi_chunks; /* Number of chunks in local quota file */
unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */
unsigned int dqi_syncms; /* How often should we sync with other nodes */
+ unsigned int dqi_syncjiff; /* Precomputed dqi_syncms in jiffies */
struct list_head dqi_chunk; /* List of chunks */
struct inode *dqi_gqinode; /* Global quota file inode */
struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */
@@ -47,6 +49,7 @@ struct ocfs2_mem_dqinfo {
struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */
struct buffer_head *dqi_ibh; /* Buffer with information header */
struct qtree_mem_dqinfo dqi_gi; /* Info about global file */
+ struct timer_list dqi_sync_timer; /* Timer for syncing dquots */
};

static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index af8340c..4a5bc09 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -1,10 +1,14 @@
/*
* Implementation of operations over global quota file
*/
+#include <linux/spinlock.h>
#include <linux/fs.h>
#include <linux/quota.h>
#include <linux/quotaops.h>
#include <linux/dqblk_qtree.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+#include <linux/writeback.h>

#define MLOG_MASK_PREFIX ML_QUOTA
#include <cluster/masklog.h>
@@ -20,6 +24,8 @@
#include "uptodate.h"
#include "quota.h"

+static void qsync_timer_fn(unsigned long oinfo_ptr);
+
static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
{
struct ocfs2_global_disk_dqblk *d = dp;
@@ -313,6 +319,7 @@ int ocfs2_global_read_info(struct super_block *sb, int type)
info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
+ oinfo->dqi_syncjiff = msecs_to_jiffies(oinfo->dqi_syncms);
oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
@@ -320,6 +327,10 @@ int ocfs2_global_read_info(struct super_block *sb, int type)
oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
OCFS2_QBLK_RESERVED_SPACE;
oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
+ setup_timer(&oinfo->dqi_sync_timer, qsync_timer_fn,
+ (unsigned long)oinfo);
+ mod_timer(&oinfo->dqi_sync_timer,
+ round_jiffies(jiffies + oinfo->dqi_syncjiff));
out_err:
mlog_exit(status);
return status;
@@ -520,6 +531,66 @@ out:
}

/*
+ * Functions for periodic syncing of dquots with global file
+ */
+static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
+{
+ handle_t *handle;
+ struct super_block *sb = dquot->dq_sb;
+ struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
+ struct ocfs2_super *osb = OCFS2_SB(sb);
+ int status = 0;
+
+ mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
+ dquot->dq_type, type, sb->s_id);
+ if (type != dquot->dq_type)
+ goto out;
+ status = ocfs2_lock_global_qf(oinfo, 1);
+ if (status < 0)
+ goto out;
+
+ handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto out_ilock;
+ }
+ mutex_lock(&sb_dqopt(sb)->dqio_mutex);
+ status = ocfs2_sync_dquot(dquot);
+ mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
+ if (status < 0)
+ mlog_errno(status);
+ /* We have to write local structure as well... */
+ dquot_mark_dquot_dirty(dquot);
+ status = dquot_commit(dquot);
+ if (status < 0)
+ mlog_errno(status);
+ ocfs2_commit_trans(osb, handle);
+out_ilock:
+ ocfs2_unlock_global_qf(oinfo, 1);
+out:
+ mlog_exit(status);
+ return status;
+}
+
+static void ocfs2_do_qsync(unsigned long oinfo_ptr)
+{
+ struct ocfs2_mem_dqinfo *oinfo = (struct ocfs2_mem_dqinfo *)oinfo_ptr;
+ struct super_block *sb = oinfo->dqi_gqinode->i_sb;
+
+ dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
+}
+
+static void qsync_timer_fn(unsigned long oinfo_ptr)
+{
+ struct ocfs2_mem_dqinfo *oinfo = (struct ocfs2_mem_dqinfo *)oinfo_ptr;
+
+ pdflush_operation(ocfs2_do_qsync, oinfo_ptr);
+ mod_timer(&oinfo->dqi_sync_timer,
+ round_jiffies(jiffies + oinfo->dqi_syncjiff));
+}
+
+/*
* Wrappers for generic quota functions
*/

diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index 55c3f2f..1db7a16 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -368,6 +368,10 @@ static int ocfs2_local_free_info(struct super_block *sb, int type)
int mark_clean = 1, len;
int status;

+ /* At this point we know there are no more dquots and thus
+ * even if there's some sync in the pdflush queue, it won't
+ * find any dquots and return without doing anything */
+ del_timer_sync(&oinfo->dqi_sync_timer);
iput(oinfo->dqi_gqinode);
ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
ocfs2_lock_res_free(&oinfo->dqi_gqlock);
--
1.5.6


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