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Message-Id: <1232129299-22018-3-git-send-email-jack@suse.cz>
Date: Fri, 16 Jan 2009 19:08:10 +0100
From: Jan Kara <jack@...e.cz>
To: linux-kernel@...r.kernel.org
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Jan Kara <jack@...e.cz>
Subject: [PATCH 02/11] ocfs2: Remove ocfs2_dquot_initialize() and ocfs2_dquot_drop()
Since ->acquire_dquot and ->release_dquot callbacks aren't called under
dqptr_sem anymore, we don't have to start a transaction and obtain locks
so early. So we can just remove all this complicated stuff.
Signed-off-by: Jan Kara <jack@...e.cz>
---
fs/ocfs2/quota_global.c | 169 +----------------------------------------------
1 files changed, 2 insertions(+), 167 deletions(-)
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index 6aff8f2..f4efa89 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -810,171 +810,6 @@ out:
return status;
}
-/* This is difficult. We have to lock quota inode and start transaction
- * in this function but we don't want to take the penalty of exlusive
- * quota file lock when we are just going to use cached structures. So
- * we just take read lock check whether we have dquot cached and if so,
- * we don't have to take the write lock... */
-static int ocfs2_dquot_initialize(struct inode *inode, int type)
-{
- handle_t *handle = NULL;
- int status = 0;
- struct super_block *sb = inode->i_sb;
- struct ocfs2_mem_dqinfo *oinfo;
- int exclusive = 0;
- int cnt;
- qid_t id;
-
- mlog_entry_void();
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_active(sb, cnt))
- continue;
- oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
- status = ocfs2_lock_global_qf(oinfo, 0);
- if (status < 0)
- goto out;
- /* This is just a performance optimization not a reliable test.
- * Since we hold an inode lock, noone can actually release
- * the structure until we are finished with initialization. */
- if (inode->i_dquot[cnt] != NODQUOT) {
- ocfs2_unlock_global_qf(oinfo, 0);
- continue;
- }
- /* When we have inode lock, we know that no dquot_release() can
- * run and thus we can safely check whether we need to
- * read+modify global file to get quota information or whether
- * our node already has it. */
- if (cnt == USRQUOTA)
- id = inode->i_uid;
- else if (cnt == GRPQUOTA)
- id = inode->i_gid;
- else
- BUG();
- /* Obtain exclusion from quota off... */
- down_write(&sb_dqopt(sb)->dqptr_sem);
- exclusive = !dquot_is_cached(sb, id, cnt);
- up_write(&sb_dqopt(sb)->dqptr_sem);
- if (exclusive) {
- status = ocfs2_lock_global_qf(oinfo, 1);
- if (status < 0) {
- exclusive = 0;
- mlog_errno(status);
- goto out_ilock;
- }
- handle = ocfs2_start_trans(OCFS2_SB(sb),
- ocfs2_calc_qinit_credits(sb, cnt));
- if (IS_ERR(handle)) {
- status = PTR_ERR(handle);
- mlog_errno(status);
- goto out_ilock;
- }
- }
- dquot_initialize(inode, cnt);
- if (exclusive) {
- ocfs2_commit_trans(OCFS2_SB(sb), handle);
- ocfs2_unlock_global_qf(oinfo, 1);
- }
- ocfs2_unlock_global_qf(oinfo, 0);
- }
- mlog_exit(0);
- return 0;
-out_ilock:
- if (exclusive)
- ocfs2_unlock_global_qf(oinfo, 1);
- ocfs2_unlock_global_qf(oinfo, 0);
-out:
- mlog_exit(status);
- return status;
-}
-
-static int ocfs2_dquot_drop_slow(struct inode *inode)
-{
- int status = 0;
- int cnt;
- int got_lock[MAXQUOTAS] = {0, 0};
- handle_t *handle;
- struct super_block *sb = inode->i_sb;
- struct ocfs2_mem_dqinfo *oinfo;
-
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (!sb_has_quota_active(sb, cnt))
- continue;
- oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
- status = ocfs2_lock_global_qf(oinfo, 1);
- if (status < 0)
- goto out;
- got_lock[cnt] = 1;
- }
- handle = ocfs2_start_trans(OCFS2_SB(sb),
- ocfs2_calc_qinit_credits(sb, USRQUOTA) +
- ocfs2_calc_qinit_credits(sb, GRPQUOTA));
- if (IS_ERR(handle)) {
- status = PTR_ERR(handle);
- mlog_errno(status);
- goto out;
- }
- dquot_drop(inode);
- ocfs2_commit_trans(OCFS2_SB(sb), handle);
-out:
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (got_lock[cnt]) {
- oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
- ocfs2_unlock_global_qf(oinfo, 1);
- }
- return status;
-}
-
-/* See the comment before ocfs2_dquot_initialize. */
-static int ocfs2_dquot_drop(struct inode *inode)
-{
- int status = 0;
- struct super_block *sb = inode->i_sb;
- struct ocfs2_mem_dqinfo *oinfo;
- int exclusive = 0;
- int cnt;
- int got_lock[MAXQUOTAS] = {0, 0};
-
- mlog_entry_void();
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (!sb_has_quota_active(sb, cnt))
- continue;
- oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
- status = ocfs2_lock_global_qf(oinfo, 0);
- if (status < 0)
- goto out;
- got_lock[cnt] = 1;
- }
- /* Lock against anyone releasing references so that when when we check
- * we know we are not going to be last ones to release dquot */
- down_write(&sb_dqopt(sb)->dqptr_sem);
- /* Urgh, this is a terrible hack :( */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (inode->i_dquot[cnt] != NODQUOT &&
- atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
- exclusive = 1;
- break;
- }
- }
- if (!exclusive)
- dquot_drop_locked(inode);
- up_write(&sb_dqopt(sb)->dqptr_sem);
-out:
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (got_lock[cnt]) {
- oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
- ocfs2_unlock_global_qf(oinfo, 0);
- }
- /* In case we bailed out because we had to do expensive locking
- * do it now... */
- if (exclusive)
- status = ocfs2_dquot_drop_slow(inode);
- mlog_exit(status);
- return status;
-}
-
static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
{
struct ocfs2_dquot *dquot =
@@ -991,8 +826,8 @@ static void ocfs2_destroy_dquot(struct dquot *dquot)
}
struct dquot_operations ocfs2_quota_operations = {
- .initialize = ocfs2_dquot_initialize,
- .drop = ocfs2_dquot_drop,
+ .initialize = dquot_initialize,
+ .drop = dquot_drop,
.alloc_space = dquot_alloc_space,
.alloc_inode = dquot_alloc_inode,
.free_space = dquot_free_space,
--
1.6.0.2
--
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