forked from luck/tmp_suning_uos_patched
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@suse.cz> Acked-by: Mark Fasheh <mfasheh@suse.de>
This commit is contained in:
Jan Kara
parent
cc33412fb1
commit
c475146d8f
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@ -810,171 +810,6 @@ static int ocfs2_write_info(struct super_block *sb, int type)
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return status;
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}
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/* This is difficult. We have to lock quota inode and start transaction
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* in this function but we don't want to take the penalty of exlusive
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* quota file lock when we are just going to use cached structures. So
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* we just take read lock check whether we have dquot cached and if so,
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* we don't have to take the write lock... */
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static int ocfs2_dquot_initialize(struct inode *inode, int type)
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{
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handle_t *handle = NULL;
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int status = 0;
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struct super_block *sb = inode->i_sb;
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struct ocfs2_mem_dqinfo *oinfo;
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int exclusive = 0;
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int cnt;
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qid_t id;
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mlog_entry_void();
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for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
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if (type != -1 && cnt != type)
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continue;
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if (!sb_has_quota_active(sb, cnt))
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continue;
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oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
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status = ocfs2_lock_global_qf(oinfo, 0);
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if (status < 0)
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goto out;
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/* This is just a performance optimization not a reliable test.
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* Since we hold an inode lock, noone can actually release
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* the structure until we are finished with initialization. */
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if (inode->i_dquot[cnt] != NODQUOT) {
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ocfs2_unlock_global_qf(oinfo, 0);
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continue;
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}
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/* When we have inode lock, we know that no dquot_release() can
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* run and thus we can safely check whether we need to
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* read+modify global file to get quota information or whether
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* our node already has it. */
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if (cnt == USRQUOTA)
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id = inode->i_uid;
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else if (cnt == GRPQUOTA)
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id = inode->i_gid;
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else
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BUG();
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/* Obtain exclusion from quota off... */
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down_write(&sb_dqopt(sb)->dqptr_sem);
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exclusive = !dquot_is_cached(sb, id, cnt);
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up_write(&sb_dqopt(sb)->dqptr_sem);
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if (exclusive) {
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status = ocfs2_lock_global_qf(oinfo, 1);
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if (status < 0) {
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exclusive = 0;
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mlog_errno(status);
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goto out_ilock;
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}
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handle = ocfs2_start_trans(OCFS2_SB(sb),
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ocfs2_calc_qinit_credits(sb, cnt));
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if (IS_ERR(handle)) {
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status = PTR_ERR(handle);
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mlog_errno(status);
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goto out_ilock;
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}
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}
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dquot_initialize(inode, cnt);
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if (exclusive) {
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ocfs2_commit_trans(OCFS2_SB(sb), handle);
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ocfs2_unlock_global_qf(oinfo, 1);
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}
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ocfs2_unlock_global_qf(oinfo, 0);
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}
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mlog_exit(0);
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return 0;
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out_ilock:
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if (exclusive)
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ocfs2_unlock_global_qf(oinfo, 1);
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ocfs2_unlock_global_qf(oinfo, 0);
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out:
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mlog_exit(status);
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return status;
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}
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static int ocfs2_dquot_drop_slow(struct inode *inode)
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{
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int status = 0;
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int cnt;
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int got_lock[MAXQUOTAS] = {0, 0};
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handle_t *handle;
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struct super_block *sb = inode->i_sb;
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struct ocfs2_mem_dqinfo *oinfo;
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for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
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if (!sb_has_quota_active(sb, cnt))
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continue;
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oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
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status = ocfs2_lock_global_qf(oinfo, 1);
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if (status < 0)
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goto out;
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got_lock[cnt] = 1;
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}
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handle = ocfs2_start_trans(OCFS2_SB(sb),
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ocfs2_calc_qinit_credits(sb, USRQUOTA) +
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ocfs2_calc_qinit_credits(sb, GRPQUOTA));
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if (IS_ERR(handle)) {
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status = PTR_ERR(handle);
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mlog_errno(status);
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goto out;
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}
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dquot_drop(inode);
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ocfs2_commit_trans(OCFS2_SB(sb), handle);
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out:
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for (cnt = 0; cnt < MAXQUOTAS; cnt++)
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if (got_lock[cnt]) {
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oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
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ocfs2_unlock_global_qf(oinfo, 1);
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}
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return status;
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}
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/* See the comment before ocfs2_dquot_initialize. */
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static int ocfs2_dquot_drop(struct inode *inode)
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{
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int status = 0;
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struct super_block *sb = inode->i_sb;
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struct ocfs2_mem_dqinfo *oinfo;
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int exclusive = 0;
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int cnt;
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int got_lock[MAXQUOTAS] = {0, 0};
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mlog_entry_void();
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for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
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if (!sb_has_quota_active(sb, cnt))
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continue;
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oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
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status = ocfs2_lock_global_qf(oinfo, 0);
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if (status < 0)
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goto out;
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got_lock[cnt] = 1;
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}
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/* Lock against anyone releasing references so that when when we check
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* we know we are not going to be last ones to release dquot */
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down_write(&sb_dqopt(sb)->dqptr_sem);
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/* Urgh, this is a terrible hack :( */
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for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
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if (inode->i_dquot[cnt] != NODQUOT &&
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atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) {
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exclusive = 1;
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break;
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}
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}
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if (!exclusive)
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dquot_drop_locked(inode);
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up_write(&sb_dqopt(sb)->dqptr_sem);
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out:
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for (cnt = 0; cnt < MAXQUOTAS; cnt++)
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if (got_lock[cnt]) {
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oinfo = sb_dqinfo(sb, cnt)->dqi_priv;
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ocfs2_unlock_global_qf(oinfo, 0);
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}
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/* In case we bailed out because we had to do expensive locking
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* do it now... */
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if (exclusive)
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status = ocfs2_dquot_drop_slow(inode);
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mlog_exit(status);
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return status;
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}
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static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
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{
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struct ocfs2_dquot *dquot =
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@ -991,8 +826,8 @@ static void ocfs2_destroy_dquot(struct dquot *dquot)
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}
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struct dquot_operations ocfs2_quota_operations = {
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.initialize = ocfs2_dquot_initialize,
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.drop = ocfs2_dquot_drop,
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.initialize = dquot_initialize,
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.drop = dquot_drop,
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.alloc_space = dquot_alloc_space,
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.alloc_inode = dquot_alloc_inode,
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.free_space = dquot_free_space,
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