Commit e285c100 authored by Steven Whitehouse's avatar Steven Whitehouse
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GFS2: Add set_xquota support 



This patch adds the ability to set GFS2 quota limit and
warning levels via the XFS quota API.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 113d6b3c

fs/gfs2/quota.c

+172 −26
Original line number Diff line number Diff line
@@ -615,8 +615,9 @@ static void do_qc(struct gfs2_quota_data *qd, s64 change) 
 * gfs2_adjust_quota - adjust record of current block usage

 * @ip: The quota inode

 * @loc: Offset of the entry in the quota file

 * @change: The amount of change to record

 * @change: The amount of usage change to record

 * @qd: The quota data

 * @fdq: The updated limits to record

 *

 * This function was mostly borrowed from gfs2_block_truncate_page which was

 * in turn mostly borrowed from ext3
@@ -625,19 +626,21 @@ static void do_qc(struct gfs2_quota_data *qd, s64 change) 
 */



static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,

			     s64 change, struct gfs2_quota_data *qd)

			     s64 change, struct gfs2_quota_data *qd,

			     struct fs_disk_quota *fdq)

{

	struct inode *inode = &ip->i_inode;

	struct address_space *mapping = inode->i_mapping;

	unsigned long index = loc >> PAGE_CACHE_SHIFT;

	unsigned offset = loc & (PAGE_CACHE_SIZE - 1);

	unsigned blocksize, iblock, pos;

	struct buffer_head *bh;

	struct buffer_head *bh, *dibh;

	struct page *page;

	void *kaddr;

	struct gfs2_quota *qp;

	s64 value;

	int err = -EIO;

	u64 size;



	if (gfs2_is_stuffed(ip))

		gfs2_unstuff_dinode(ip, NULL);
@@ -683,9 +686,34 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 
	value = (s64)be64_to_cpu(qp->qu_value) + change;

	qp->qu_value = cpu_to_be64(value);

	qd->qd_qb.qb_value = qp->qu_value;

	if (fdq) {

		if (fdq->d_fieldmask & FS_DQ_BSOFT) {

			qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit);

			qd->qd_qb.qb_warn = qp->qu_warn;

		}

		if (fdq->d_fieldmask & FS_DQ_BHARD) {

			qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit);

			qd->qd_qb.qb_limit = qp->qu_limit;

		}

	}

	flush_dcache_page(page);

	kunmap_atomic(kaddr, KM_USER0);

	err = 0;



	err = gfs2_meta_inode_buffer(ip, &dibh);

	if (err)

		goto unlock;



	size = loc + sizeof(struct gfs2_quota);

	if (size > inode->i_size) {

		ip->i_disksize = size;

		i_size_write(inode, size);

	}

	inode->i_mtime = inode->i_atime = CURRENT_TIME;

	gfs2_trans_add_bh(ip->i_gl, dibh, 1);

	gfs2_dinode_out(ip, dibh->b_data);

	brelse(dibh);

	mark_inode_dirty(inode);



unlock:

	unlock_page(page);

	page_cache_release(page);
@@ -713,6 +741,7 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 
		return -ENOMEM;



	sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);

	mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);

	for (qx = 0; qx < num_qd; qx++) {

		error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,

					   GL_NOCACHE, &ghs[qx]);
@@ -768,8 +797,7 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 
	for (x = 0; x < num_qd; x++) {

		qd = qda[x];

		offset = qd2offset(qd);

		error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,

					  (struct gfs2_quota_data *)qd);

		error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);

		if (error)

			goto out_end_trans;
@@ -789,20 +817,44 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 
out:

	while (qx--)

		gfs2_glock_dq_uninit(&ghs[qx]);

	mutex_unlock(&ip->i_inode.i_mutex);

	kfree(ghs);

	gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);

	return error;

}



static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)

{

	struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);

	struct gfs2_quota q;

	struct gfs2_quota_lvb *qlvb;

	loff_t pos;

	int error;



	memset(&q, 0, sizeof(struct gfs2_quota));

	pos = qd2offset(qd);

	error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));

	if (error < 0)

		return error;



	qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;

	qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);

	qlvb->__pad = 0;

	qlvb->qb_limit = q.qu_limit;

	qlvb->qb_warn = q.qu_warn;

	qlvb->qb_value = q.qu_value;

	qd->qd_qb = *qlvb;



	return 0;

}



static int do_glock(struct gfs2_quota_data *qd, int force_refresh,

		    struct gfs2_holder *q_gh)

{

	struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;

	struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);

	struct gfs2_holder i_gh;

	struct gfs2_quota q;

	int error;

	struct gfs2_quota_lvb *qlvb;



restart:

	error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
@@ -812,7 +864,6 @@ static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 
	qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;



	if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {

		loff_t pos;

		gfs2_glock_dq_uninit(q_gh);

		error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,

					   GL_NOCACHE, q_gh);
@@ -823,25 +874,11 @@ static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 
		if (error)

			goto fail;



		memset(&q, 0, sizeof(struct gfs2_quota));

		pos = qd2offset(qd);

		error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));

		if (error < 0)

			goto fail_gunlock;

		if ((error < sizeof(q)) && force_refresh) {

			error = -ENOENT;

		error = update_qd(sdp, qd);

		if (error)

			goto fail_gunlock;

		}

		gfs2_glock_dq_uninit(&i_gh);



		qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;

		qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);

		qlvb->__pad = 0;

		qlvb->qb_limit = q.qu_limit;

		qlvb->qb_warn = q.qu_warn;

		qlvb->qb_value = q.qu_value;

		qd->qd_qb = *qlvb;



		gfs2_glock_dq_uninit(&i_gh);

		gfs2_glock_dq_uninit(q_gh);

		force_refresh = 0;

		goto restart;
@@ -1409,9 +1446,118 @@ static int gfs2_xquota_get(struct super_block *sb, int type, qid_t id, 
	return error;

}



/* GFS2 only supports a subset of the XFS fields */

#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)



static int gfs2_xquota_set(struct super_block *sb, int type, qid_t id,

			   struct fs_disk_quota *fdq)

{

	struct gfs2_sbd *sdp = sb->s_fs_info;

	struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);

	struct gfs2_quota_data *qd;

	struct gfs2_holder q_gh, i_gh;

	unsigned int data_blocks, ind_blocks;

	unsigned int blocks = 0;

	int alloc_required;

	struct gfs2_alloc *al;

	loff_t offset;

	int error;



	if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)

		return -ESRCH; /* Crazy XFS error code */



	switch(type) {

	case USRQUOTA:

		type = QUOTA_USER;

		if (fdq->d_flags != XFS_USER_QUOTA)

			return -EINVAL;

		break;

	case GRPQUOTA:

		type = QUOTA_GROUP;

		if (fdq->d_flags != XFS_GROUP_QUOTA)

			return -EINVAL;

		break;

	default:

		return -EINVAL;

	}



	if (fdq->d_fieldmask & ~GFS2_FIELDMASK)

		return -EINVAL;

	if (fdq->d_id != id)

		return -EINVAL;



	error = qd_get(sdp, type, id, &qd);

	if (error)

		return error;



	mutex_lock(&ip->i_inode.i_mutex);

	error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);

	if (error)

		goto out_put;

	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);

	if (error)

		goto out_q;



	/* Check for existing entry, if none then alloc new blocks */

	error = update_qd(sdp, qd);

	if (error)

		goto out_i;



	/* If nothing has changed, this is a no-op */

	if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&

	    (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))

		fdq->d_fieldmask ^= FS_DQ_BSOFT;

	if ((fdq->d_fieldmask & FS_DQ_BHARD) &&

	    (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))

		fdq->d_fieldmask ^= FS_DQ_BHARD;

	if (fdq->d_fieldmask == 0)

		goto out_i;



	offset = qd2offset(qd);

	error = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota),

					  &alloc_required);

	if (error)

		goto out_i;

	if (alloc_required) {

		al = gfs2_alloc_get(ip);

		if (al == NULL)

			goto out_i;

		gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),

				       &data_blocks, &ind_blocks);

		blocks = al->al_requested = 1 + data_blocks + ind_blocks;

		error = gfs2_inplace_reserve(ip);

		if (error)

			goto out_alloc;

	}



	error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);

	if (error)

		goto out_release;



	/* Apply changes */

	error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);



	gfs2_trans_end(sdp);

out_release:

	if (alloc_required) {

		gfs2_inplace_release(ip);

out_alloc:

		gfs2_alloc_put(ip);

	}

out_i:

	gfs2_glock_dq_uninit(&i_gh);

out_q:

	gfs2_glock_dq_uninit(&q_gh);

out_put:

	mutex_unlock(&ip->i_inode.i_mutex);

	qd_put(qd);

	return error;

}



const struct quotactl_ops gfs2_quotactl_ops = {

	.quota_sync     = gfs2_quota_sync,

	.get_xstate     = gfs2_quota_get_xstate,

	.get_xquota	= gfs2_xquota_get,

	.set_xquota	= gfs2_xquota_set,

};