[mirror_ubuntu-artful-kernel.git] / fs / xfs / xfs_trans_rmap.c

/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_rmap_item.h"
#include "xfs_alloc.h"
#include "xfs_rmap.h"

/* Set the map extent flags for this reverse mapping. */
static void
xfs_trans_set_rmap_flags(
	struct xfs_map_extent		*rmap,
	enum xfs_rmap_intent_type	type,
	int				whichfork,
	xfs_exntst_t			state)
{
	rmap->me_flags = 0;
	if (state == XFS_EXT_UNWRITTEN)
		rmap->me_flags |= XFS_RMAP_EXTENT_UNWRITTEN;
	if (whichfork == XFS_ATTR_FORK)
		rmap->me_flags |= XFS_RMAP_EXTENT_ATTR_FORK;
	switch (type) {
	case XFS_RMAP_MAP:
		rmap->me_flags |= XFS_RMAP_EXTENT_MAP;
		break;
	case XFS_RMAP_MAP_SHARED:
		rmap->me_flags |= XFS_RMAP_EXTENT_MAP_SHARED;
		break;
	case XFS_RMAP_UNMAP:
		rmap->me_flags |= XFS_RMAP_EXTENT_UNMAP;
		break;
	case XFS_RMAP_UNMAP_SHARED:
		rmap->me_flags |= XFS_RMAP_EXTENT_UNMAP_SHARED;
		break;
	case XFS_RMAP_CONVERT:
		rmap->me_flags |= XFS_RMAP_EXTENT_CONVERT;
		break;
	case XFS_RMAP_CONVERT_SHARED:
		rmap->me_flags |= XFS_RMAP_EXTENT_CONVERT_SHARED;
		break;
	case XFS_RMAP_ALLOC:
		rmap->me_flags |= XFS_RMAP_EXTENT_ALLOC;
		break;
	case XFS_RMAP_FREE:
		rmap->me_flags |= XFS_RMAP_EXTENT_FREE;
		break;
	default:
		ASSERT(0);
	}
}

struct xfs_rud_log_item *
xfs_trans_get_rud(
	struct xfs_trans		*tp,
	struct xfs_rui_log_item		*ruip)
{
	struct xfs_rud_log_item		*rudp;

	rudp = xfs_rud_init(tp->t_mountp, ruip);
	xfs_trans_add_item(tp, &rudp->rud_item);
	return rudp;
}

/*
 * Finish an rmap update and log it to the RUD. Note that the transaction is
 * marked dirty regardless of whether the rmap update succeeds or fails to
 * support the RUI/RUD lifecycle rules.
 */
int
xfs_trans_log_finish_rmap_update(
	struct xfs_trans		*tp,
	struct xfs_rud_log_item		*rudp,
	enum xfs_rmap_intent_type	type,
	uint64_t			owner,
	int				whichfork,
	xfs_fileoff_t			startoff,
	xfs_fsblock_t			startblock,
	xfs_filblks_t			blockcount,
	xfs_exntst_t			state,
	struct xfs_btree_cur		**pcur)
{
	int				error;

	error = xfs_rmap_finish_one(tp, type, owner, whichfork, startoff,
			startblock, blockcount, state, pcur);

	/*
	 * Mark the transaction dirty, even on error. This ensures the
	 * transaction is aborted, which:
	 *
	 * 1.) releases the RUI and frees the RUD
	 * 2.) shuts down the filesystem
	 */
	tp->t_flags |= XFS_TRANS_DIRTY;
	rudp->rud_item.li_desc->lid_flags |= XFS_LID_DIRTY;

	return error;
}

/* Sort rmap intents by AG. */
static int
xfs_rmap_update_diff_items(
	void				*priv,
	struct list_head		*a,
	struct list_head		*b)
{
	struct xfs_mount		*mp = priv;
	struct xfs_rmap_intent		*ra;
	struct xfs_rmap_intent		*rb;

	ra = container_of(a, struct xfs_rmap_intent, ri_list);
	rb = container_of(b, struct xfs_rmap_intent, ri_list);
	return  XFS_FSB_TO_AGNO(mp, ra->ri_bmap.br_startblock) -
		XFS_FSB_TO_AGNO(mp, rb->ri_bmap.br_startblock);
}

/* Get an RUI. */
STATIC void *
xfs_rmap_update_create_intent(
	struct xfs_trans		*tp,
	unsigned int			count)
{
	struct xfs_rui_log_item		*ruip;

	ASSERT(tp != NULL);
	ASSERT(count > 0);

	ruip = xfs_rui_init(tp->t_mountp, count);
	ASSERT(ruip != NULL);

	/*
	 * Get a log_item_desc to point at the new item.
	 */
	xfs_trans_add_item(tp, &ruip->rui_item);
	return ruip;
}

/* Log rmap updates in the intent item. */
STATIC void
xfs_rmap_update_log_item(
	struct xfs_trans		*tp,
	void				*intent,
	struct list_head		*item)
{
	struct xfs_rui_log_item		*ruip = intent;
	struct xfs_rmap_intent		*rmap;
	uint				next_extent;
	struct xfs_map_extent		*map;

	rmap = container_of(item, struct xfs_rmap_intent, ri_list);

	tp->t_flags |= XFS_TRANS_DIRTY;
	ruip->rui_item.li_desc->lid_flags |= XFS_LID_DIRTY;

	/*
	 * atomic_inc_return gives us the value after the increment;
	 * we want to use it as an array index so we need to subtract 1 from
	 * it.
	 */
	next_extent = atomic_inc_return(&ruip->rui_next_extent) - 1;
	ASSERT(next_extent < ruip->rui_format.rui_nextents);
	map = &ruip->rui_format.rui_extents[next_extent];
	map->me_owner = rmap->ri_owner;
	map->me_startblock = rmap->ri_bmap.br_startblock;
	map->me_startoff = rmap->ri_bmap.br_startoff;
	map->me_len = rmap->ri_bmap.br_blockcount;
	xfs_trans_set_rmap_flags(map, rmap->ri_type, rmap->ri_whichfork,
			rmap->ri_bmap.br_state);
}

/* Get an RUD so we can process all the deferred rmap updates. */
STATIC void *
xfs_rmap_update_create_done(
	struct xfs_trans		*tp,
	void				*intent,
	unsigned int			count)
{
	return xfs_trans_get_rud(tp, intent);
}

/* Process a deferred rmap update. */
STATIC int
xfs_rmap_update_finish_item(
	struct xfs_trans		*tp,
	struct xfs_defer_ops		*dop,
	struct list_head		*item,
	void				*done_item,
	void				**state)
{
	struct xfs_rmap_intent		*rmap;
	int				error;

	rmap = container_of(item, struct xfs_rmap_intent, ri_list);
	error = xfs_trans_log_finish_rmap_update(tp, done_item,
			rmap->ri_type,
			rmap->ri_owner, rmap->ri_whichfork,
			rmap->ri_bmap.br_startoff,
			rmap->ri_bmap.br_startblock,
			rmap->ri_bmap.br_blockcount,
			rmap->ri_bmap.br_state,
			(struct xfs_btree_cur **)state);
	kmem_free(rmap);
	return error;
}

/* Clean up after processing deferred rmaps. */
STATIC void
xfs_rmap_update_finish_cleanup(
	struct xfs_trans	*tp,
	void			*state,
	int			error)
{
	struct xfs_btree_cur	*rcur = state;

	xfs_rmap_finish_one_cleanup(tp, rcur, error);
}

/* Abort all pending RUIs. */
STATIC void
xfs_rmap_update_abort_intent(
	void				*intent)
{
	xfs_rui_release(intent);
}

/* Cancel a deferred rmap update. */
STATIC void
xfs_rmap_update_cancel_item(
	struct list_head		*item)
{
	struct xfs_rmap_intent		*rmap;

	rmap = container_of(item, struct xfs_rmap_intent, ri_list);
	kmem_free(rmap);
}

static const struct xfs_defer_op_type xfs_rmap_update_defer_type = {
	.type		= XFS_DEFER_OPS_TYPE_RMAP,
	.max_items	= XFS_RUI_MAX_FAST_EXTENTS,
	.diff_items	= xfs_rmap_update_diff_items,
	.create_intent	= xfs_rmap_update_create_intent,
	.abort_intent	= xfs_rmap_update_abort_intent,
	.log_item	= xfs_rmap_update_log_item,
	.create_done	= xfs_rmap_update_create_done,
	.finish_item	= xfs_rmap_update_finish_item,
	.finish_cleanup = xfs_rmap_update_finish_cleanup,
	.cancel_item	= xfs_rmap_update_cancel_item,
};

/* Register the deferred op type. */
void
xfs_rmap_update_init_defer_op(void)
{
	xfs_defer_init_op_type(&xfs_rmap_update_defer_type);
}
Commit	Line	Data
9e88b5d8 DW	1	/*
	2	* Copyright (C) 2016 Oracle. All Rights Reserved.
	3	*
	4	* Author: Darrick J. Wong <darrick.wong@oracle.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version 2
	9	* of the License, or (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it would be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write the Free Software Foundation,
	18	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
	19	*/
	20	#include "xfs.h"
	21	#include "xfs_fs.h"
	22	#include "xfs_shared.h"
	23	#include "xfs_format.h"
	24	#include "xfs_log_format.h"
	25	#include "xfs_trans_resv.h"
	26	#include "xfs_mount.h"
	27	#include "xfs_defer.h"
	28	#include "xfs_trans.h"
	29	#include "xfs_trans_priv.h"
	30	#include "xfs_rmap_item.h"
	31	#include "xfs_alloc.h"
	32	#include "xfs_rmap.h"
	33
9e88b5d8 DW	34	/* Set the map extent flags for this reverse mapping. */
	35	static void
	36	xfs_trans_set_rmap_flags(
	37	struct xfs_map_extent *rmap,
	38	enum xfs_rmap_intent_type type,
	39	int whichfork,
	40	xfs_exntst_t state)
	41	{
	42	rmap->me_flags = 0;
	43	if (state == XFS_EXT_UNWRITTEN)
	44	rmap->me_flags \|= XFS_RMAP_EXTENT_UNWRITTEN;
	45	if (whichfork == XFS_ATTR_FORK)
	46	rmap->me_flags \|= XFS_RMAP_EXTENT_ATTR_FORK;
	47	switch (type) {
	48	case XFS_RMAP_MAP:
	49	rmap->me_flags \|= XFS_RMAP_EXTENT_MAP;
	50	break;
0e07c039 DW	51	case XFS_RMAP_MAP_SHARED:
	52	rmap->me_flags \|= XFS_RMAP_EXTENT_MAP_SHARED;
	53	break;
9e88b5d8 DW	54	case XFS_RMAP_UNMAP:
	55	rmap->me_flags \|= XFS_RMAP_EXTENT_UNMAP;
	56	break;
0e07c039 DW	57	case XFS_RMAP_UNMAP_SHARED:
	58	rmap->me_flags \|= XFS_RMAP_EXTENT_UNMAP_SHARED;
	59	break;
9e88b5d8 DW	60	case XFS_RMAP_CONVERT:
	61	rmap->me_flags \|= XFS_RMAP_EXTENT_CONVERT;
	62	break;
0e07c039 DW	63	case XFS_RMAP_CONVERT_SHARED:
	64	rmap->me_flags \|= XFS_RMAP_EXTENT_CONVERT_SHARED;
	65	break;
9e88b5d8 DW	66	case XFS_RMAP_ALLOC:
	67	rmap->me_flags \|= XFS_RMAP_EXTENT_ALLOC;
	68	break;
	69	case XFS_RMAP_FREE:
	70	rmap->me_flags \|= XFS_RMAP_EXTENT_FREE;
	71	break;
	72	default:
	73	ASSERT(0);
	74	}
	75	}
	76
9e88b5d8 DW	77	struct xfs_rud_log_item *
	78	xfs_trans_get_rud(
	79	struct xfs_trans *tp,
722e2517	80	struct xfs_rui_log_item *ruip)
9e88b5d8 DW	81	{
	82	struct xfs_rud_log_item *rudp;
	83
722e2517	84	rudp = xfs_rud_init(tp->t_mountp, ruip);
9e88b5d8 DW	85	xfs_trans_add_item(tp, &rudp->rud_item);
	86	return rudp;
	87	}
	88
	89	/*
	90	* Finish an rmap update and log it to the RUD. Note that the transaction is
	91	* marked dirty regardless of whether the rmap update succeeds or fails to
	92	* support the RUI/RUD lifecycle rules.
	93	*/
	94	int
	95	xfs_trans_log_finish_rmap_update(
	96	struct xfs_trans *tp,
	97	struct xfs_rud_log_item *rudp,
	98	enum xfs_rmap_intent_type type,
c8ce540d	99	uint64_t owner,
9e88b5d8 DW	100	int whichfork,
	101	xfs_fileoff_t startoff,
	102	xfs_fsblock_t startblock,
	103	xfs_filblks_t blockcount,
9c194644 DW	104	xfs_exntst_t state,
9c194644 DW	105	struct xfs_btree_cur **pcur)
9e88b5d8	106	{
9e88b5d8 DW	107	int error;
9e88b5d8 DW	108
9c194644 DW	109	error = xfs_rmap_finish_one(tp, type, owner, whichfork, startoff,
9c194644 DW	110	startblock, blockcount, state, pcur);
9e88b5d8 DW	111
	112	/*
	113	* Mark the transaction dirty, even on error. This ensures the
	114	* transaction is aborted, which:
	115	*
	116	* 1.) releases the RUI and frees the RUD
	117	* 2.) shuts down the filesystem
	118	*/
	119	tp->t_flags \|= XFS_TRANS_DIRTY;
	120	rudp->rud_item.li_desc->lid_flags \|= XFS_LID_DIRTY;
	121
9e88b5d8 DW	122	return error;
9e88b5d8 DW	123	}
f8dbebef DW	124
	125	/* Sort rmap intents by AG. */
	126	static int
	127	xfs_rmap_update_diff_items(
	128	void *priv,
	129	struct list_head *a,
	130	struct list_head *b)
	131	{
	132	struct xfs_mount *mp = priv;
	133	struct xfs_rmap_intent *ra;
	134	struct xfs_rmap_intent *rb;
	135
	136	ra = container_of(a, struct xfs_rmap_intent, ri_list);
	137	rb = container_of(b, struct xfs_rmap_intent, ri_list);
	138	return XFS_FSB_TO_AGNO(mp, ra->ri_bmap.br_startblock) -
	139	XFS_FSB_TO_AGNO(mp, rb->ri_bmap.br_startblock);
	140	}
	141
	142	/* Get an RUI. */
	143	STATIC void *
	144	xfs_rmap_update_create_intent(
	145	struct xfs_trans *tp,
	146	unsigned int count)
	147	{
51ce9d00 DW	148	struct xfs_rui_log_item *ruip;
	149
	150	ASSERT(tp != NULL);
	151	ASSERT(count > 0);
	152
	153	ruip = xfs_rui_init(tp->t_mountp, count);
	154	ASSERT(ruip != NULL);
	155
	156	/*
	157	* Get a log_item_desc to point at the new item.
	158	*/
	159	xfs_trans_add_item(tp, &ruip->rui_item);
	160	return ruip;
f8dbebef DW	161	}
	162
	163	/* Log rmap updates in the intent item. */
	164	STATIC void
	165	xfs_rmap_update_log_item(
	166	struct xfs_trans *tp,
	167	void *intent,
	168	struct list_head *item)
	169	{
51ce9d00	170	struct xfs_rui_log_item *ruip = intent;
f8dbebef	171	struct xfs_rmap_intent *rmap;
51ce9d00 DW	172	uint next_extent;
51ce9d00 DW	173	struct xfs_map_extent *map;
f8dbebef DW	174
f8dbebef DW	175	rmap = container_of(item, struct xfs_rmap_intent, ri_list);
51ce9d00 DW	176
	177	tp->t_flags \|= XFS_TRANS_DIRTY;
	178	ruip->rui_item.li_desc->lid_flags \|= XFS_LID_DIRTY;
	179
	180	/*
	181	* atomic_inc_return gives us the value after the increment;
	182	* we want to use it as an array index so we need to subtract 1 from
	183	* it.
	184	*/
	185	next_extent = atomic_inc_return(&ruip->rui_next_extent) - 1;
	186	ASSERT(next_extent < ruip->rui_format.rui_nextents);
	187	map = &ruip->rui_format.rui_extents[next_extent];
	188	map->me_owner = rmap->ri_owner;
	189	map->me_startblock = rmap->ri_bmap.br_startblock;
	190	map->me_startoff = rmap->ri_bmap.br_startoff;
	191	map->me_len = rmap->ri_bmap.br_blockcount;
	192	xfs_trans_set_rmap_flags(map, rmap->ri_type, rmap->ri_whichfork,
f8dbebef DW	193	rmap->ri_bmap.br_state);
	194	}
	195
	196	/* Get an RUD so we can process all the deferred rmap updates. */
	197	STATIC void *
	198	xfs_rmap_update_create_done(
	199	struct xfs_trans *tp,
	200	void *intent,
	201	unsigned int count)
	202	{
722e2517	203	return xfs_trans_get_rud(tp, intent);
f8dbebef DW	204	}
	205
	206	/* Process a deferred rmap update. */
	207	STATIC int
	208	xfs_rmap_update_finish_item(
	209	struct xfs_trans *tp,
	210	struct xfs_defer_ops *dop,
	211	struct list_head *item,
	212	void *done_item,
	213	void **state)
	214	{
	215	struct xfs_rmap_intent *rmap;
	216	int error;
	217
	218	rmap = container_of(item, struct xfs_rmap_intent, ri_list);
	219	error = xfs_trans_log_finish_rmap_update(tp, done_item,
	220	rmap->ri_type,
	221	rmap->ri_owner, rmap->ri_whichfork,
	222	rmap->ri_bmap.br_startoff,
	223	rmap->ri_bmap.br_startblock,
	224	rmap->ri_bmap.br_blockcount,
9c194644 DW	225	rmap->ri_bmap.br_state,
9c194644 DW	226	(struct xfs_btree_cur **)state);
f8dbebef DW	227	kmem_free(rmap);
	228	return error;
	229	}
	230
	231	/* Clean up after processing deferred rmaps. */
	232	STATIC void
	233	xfs_rmap_update_finish_cleanup(
	234	struct xfs_trans *tp,
	235	void *state,
	236	int error)
	237	{
9c194644 DW	238	struct xfs_btree_cur *rcur = state;
	239
	240	xfs_rmap_finish_one_cleanup(tp, rcur, error);
f8dbebef DW	241	}
	242
	243	/* Abort all pending RUIs. */
	244	STATIC void
	245	xfs_rmap_update_abort_intent(
	246	void *intent)
	247	{
	248	xfs_rui_release(intent);
	249	}
	250
	251	/* Cancel a deferred rmap update. */
	252	STATIC void
	253	xfs_rmap_update_cancel_item(
	254	struct list_head *item)
	255	{
	256	struct xfs_rmap_intent *rmap;
	257
	258	rmap = container_of(item, struct xfs_rmap_intent, ri_list);
	259	kmem_free(rmap);
	260	}
	261
	262	static const struct xfs_defer_op_type xfs_rmap_update_defer_type = {
	263	.type = XFS_DEFER_OPS_TYPE_RMAP,
	264	.max_items = XFS_RUI_MAX_FAST_EXTENTS,
	265	.diff_items = xfs_rmap_update_diff_items,
	266	.create_intent = xfs_rmap_update_create_intent,
	267	.abort_intent = xfs_rmap_update_abort_intent,
	268	.log_item = xfs_rmap_update_log_item,
	269	.create_done = xfs_rmap_update_create_done,
	270	.finish_item = xfs_rmap_update_finish_item,
	271	.finish_cleanup = xfs_rmap_update_finish_cleanup,
	272	.cancel_item = xfs_rmap_update_cancel_item,
	273	};
	274
	275	/* Register the deferred op type. */
	276	void
	277	xfs_rmap_update_init_defer_op(void)
	278	{
	279	xfs_defer_init_op_type(&xfs_rmap_update_defer_type);
	280	}