[linux-2.6-block.git] / fs / xfs / xfs_trans_bmap.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#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_bmap_item.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_inode.h"
#include "xfs_defer.h"

/*
 * This routine is called to allocate a "bmap update done"
 * log item.
 */
struct xfs_bud_log_item *
xfs_trans_get_bud(
	struct xfs_trans		*tp,
	struct xfs_bui_log_item		*buip)
{
	struct xfs_bud_log_item		*budp;

	budp = xfs_bud_init(tp->t_mountp, buip);
	xfs_trans_add_item(tp, &budp->bud_item);
	return budp;
}

/*
 * Finish an bmap update and log it to the BUD. Note that the
 * transaction is marked dirty regardless of whether the bmap update
 * succeeds or fails to support the BUI/BUD lifecycle rules.
 */
int
xfs_trans_log_finish_bmap_update(
	struct xfs_trans		*tp,
	struct xfs_bud_log_item		*budp,
	enum xfs_bmap_intent_type	type,
	struct xfs_inode		*ip,
	int				whichfork,
	xfs_fileoff_t			startoff,
	xfs_fsblock_t			startblock,
	xfs_filblks_t			*blockcount,
	xfs_exntst_t			state)
{
	int				error;

	error = xfs_bmap_finish_one(tp, ip, type, whichfork, startoff,
			startblock, blockcount, state);

	/*
	 * Mark the transaction dirty, even on error. This ensures the
	 * transaction is aborted, which:
	 *
	 * 1.) releases the BUI and frees the BUD
	 * 2.) shuts down the filesystem
	 */
	tp->t_flags |= XFS_TRANS_DIRTY;
	set_bit(XFS_LI_DIRTY, &budp->bud_item.li_flags);

	return error;
}

/* Sort bmap intents by inode. */
static int
xfs_bmap_update_diff_items(
	void				*priv,
	struct list_head		*a,
	struct list_head		*b)
{
	struct xfs_bmap_intent		*ba;
	struct xfs_bmap_intent		*bb;

	ba = container_of(a, struct xfs_bmap_intent, bi_list);
	bb = container_of(b, struct xfs_bmap_intent, bi_list);
	return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
}

/* Get an BUI. */
STATIC void *
xfs_bmap_update_create_intent(
	struct xfs_trans		*tp,
	unsigned int			count)
{
	struct xfs_bui_log_item		*buip;

	ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);
	ASSERT(tp != NULL);

	buip = xfs_bui_init(tp->t_mountp);
	ASSERT(buip != NULL);

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

/* Set the map extent flags for this mapping. */
static void
xfs_trans_set_bmap_flags(
	struct xfs_map_extent		*bmap,
	enum xfs_bmap_intent_type	type,
	int				whichfork,
	xfs_exntst_t			state)
{
	bmap->me_flags = 0;
	switch (type) {
	case XFS_BMAP_MAP:
	case XFS_BMAP_UNMAP:
		bmap->me_flags = type;
		break;
	default:
		ASSERT(0);
	}
	if (state == XFS_EXT_UNWRITTEN)
		bmap->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN;
	if (whichfork == XFS_ATTR_FORK)
		bmap->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK;
}

/* Log bmap updates in the intent item. */
STATIC void
xfs_bmap_update_log_item(
	struct xfs_trans		*tp,
	void				*intent,
	struct list_head		*item)
{
	struct xfs_bui_log_item		*buip = intent;
	struct xfs_bmap_intent		*bmap;
	uint				next_extent;
	struct xfs_map_extent		*map;

	bmap = container_of(item, struct xfs_bmap_intent, bi_list);

	tp->t_flags |= XFS_TRANS_DIRTY;
	set_bit(XFS_LI_DIRTY, &buip->bui_item.li_flags);

	/*
	 * 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(&buip->bui_next_extent) - 1;
	ASSERT(next_extent < buip->bui_format.bui_nextents);
	map = &buip->bui_format.bui_extents[next_extent];
	map->me_owner = bmap->bi_owner->i_ino;
	map->me_startblock = bmap->bi_bmap.br_startblock;
	map->me_startoff = bmap->bi_bmap.br_startoff;
	map->me_len = bmap->bi_bmap.br_blockcount;
	xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork,
			bmap->bi_bmap.br_state);
}

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

/* Process a deferred rmap update. */
STATIC int
xfs_bmap_update_finish_item(
	struct xfs_trans		*tp,
	struct list_head		*item,
	void				*done_item,
	void				**state)
{
	struct xfs_bmap_intent		*bmap;
	xfs_filblks_t			count;
	int				error;

	bmap = container_of(item, struct xfs_bmap_intent, bi_list);
	count = bmap->bi_bmap.br_blockcount;
	error = xfs_trans_log_finish_bmap_update(tp, done_item,
			bmap->bi_type,
			bmap->bi_owner, bmap->bi_whichfork,
			bmap->bi_bmap.br_startoff,
			bmap->bi_bmap.br_startblock,
			&count,
			bmap->bi_bmap.br_state);
	if (!error && count > 0) {
		ASSERT(bmap->bi_type == XFS_BMAP_UNMAP);
		bmap->bi_bmap.br_blockcount = count;
		return -EAGAIN;
	}
	kmem_free(bmap);
	return error;
}

/* Abort all pending BUIs. */
STATIC void
xfs_bmap_update_abort_intent(
	void				*intent)
{
	xfs_bui_release(intent);
}

/* Cancel a deferred rmap update. */
STATIC void
xfs_bmap_update_cancel_item(
	struct list_head		*item)
{
	struct xfs_bmap_intent		*bmap;

	bmap = container_of(item, struct xfs_bmap_intent, bi_list);
	kmem_free(bmap);
}

const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
	.max_items	= XFS_BUI_MAX_FAST_EXTENTS,
	.diff_items	= xfs_bmap_update_diff_items,
	.create_intent	= xfs_bmap_update_create_intent,
	.abort_intent	= xfs_bmap_update_abort_intent,
	.log_item	= xfs_bmap_update_log_item,
	.create_done	= xfs_bmap_update_create_done,
	.finish_item	= xfs_bmap_update_finish_item,
	.cancel_item	= xfs_bmap_update_cancel_item,
};
Commit	Line	Data
0b61f8a4	1	// SPDX-License-Identifier: GPL-2.0+
77d61fe4 DW	2	/*
77d61fe4 DW	3	* Copyright (C) 2016 Oracle. All Rights Reserved.
77d61fe4	4	* Author: Darrick J. Wong <darrick.wong@oracle.com>
77d61fe4 DW	5	*/
	6	#include "xfs.h"
	7	#include "xfs_fs.h"
	8	#include "xfs_shared.h"
	9	#include "xfs_format.h"
	10	#include "xfs_log_format.h"
	11	#include "xfs_trans_resv.h"
	12	#include "xfs_mount.h"
	13	#include "xfs_defer.h"
	14	#include "xfs_trans.h"
	15	#include "xfs_trans_priv.h"
	16	#include "xfs_bmap_item.h"
	17	#include "xfs_alloc.h"
	18	#include "xfs_bmap.h"
	19	#include "xfs_inode.h"
bc9f2b7c	20	#include "xfs_defer.h"
77d61fe4 DW	21
	22	/*
	23	* This routine is called to allocate a "bmap update done"
	24	* log item.
	25	*/
	26	struct xfs_bud_log_item *
	27	xfs_trans_get_bud(
	28	struct xfs_trans *tp,
	29	struct xfs_bui_log_item *buip)
	30	{
	31	struct xfs_bud_log_item *budp;
	32
	33	budp = xfs_bud_init(tp->t_mountp, buip);
	34	xfs_trans_add_item(tp, &budp->bud_item);
	35	return budp;
	36	}
	37
	38	/*
	39	* Finish an bmap update and log it to the BUD. Note that the
	40	* transaction is marked dirty regardless of whether the bmap update
	41	* succeeds or fails to support the BUI/BUD lifecycle rules.
	42	*/
	43	int
	44	xfs_trans_log_finish_bmap_update(
	45	struct xfs_trans *tp,
	46	struct xfs_bud_log_item *budp,
77d61fe4 DW	47	enum xfs_bmap_intent_type type,
	48	struct xfs_inode *ip,
	49	int whichfork,
	50	xfs_fileoff_t startoff,
	51	xfs_fsblock_t startblock,
e1a4e37c	52	xfs_filblks_t *blockcount,
77d61fe4 DW	53	xfs_exntst_t state)
	54	{
	55	int error;
	56
7dbddbac	57	error = xfs_bmap_finish_one(tp, ip, type, whichfork, startoff,
9f3afb57	58	startblock, blockcount, state);
77d61fe4 DW	59
	60	/*
	61	* Mark the transaction dirty, even on error. This ensures the
	62	* transaction is aborted, which:
	63	*
	64	* 1.) releases the BUI and frees the BUD
	65	* 2.) shuts down the filesystem
	66	*/
	67	tp->t_flags \|= XFS_TRANS_DIRTY;
e6631f85	68	set_bit(XFS_LI_DIRTY, &budp->bud_item.li_flags);
77d61fe4 DW	69
	70	return error;
	71	}
9f3afb57 DW	72
	73	/* Sort bmap intents by inode. */
	74	static int
	75	xfs_bmap_update_diff_items(
	76	void *priv,
	77	struct list_head *a,
	78	struct list_head *b)
	79	{
	80	struct xfs_bmap_intent *ba;
	81	struct xfs_bmap_intent *bb;
	82
	83	ba = container_of(a, struct xfs_bmap_intent, bi_list);
	84	bb = container_of(b, struct xfs_bmap_intent, bi_list);
	85	return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
	86	}
	87
	88	/* Get an BUI. */
	89	STATIC void *
	90	xfs_bmap_update_create_intent(
	91	struct xfs_trans *tp,
	92	unsigned int count)
	93	{
	94	struct xfs_bui_log_item *buip;
	95
	96	ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);
	97	ASSERT(tp != NULL);
	98
	99	buip = xfs_bui_init(tp->t_mountp);
	100	ASSERT(buip != NULL);
	101
	102	/*
	103	* Get a log_item_desc to point at the new item.
	104	*/
	105	xfs_trans_add_item(tp, &buip->bui_item);
	106	return buip;
	107	}
	108
	109	/* Set the map extent flags for this mapping. */
	110	static void
	111	xfs_trans_set_bmap_flags(
	112	struct xfs_map_extent *bmap,
	113	enum xfs_bmap_intent_type type,
	114	int whichfork,
	115	xfs_exntst_t state)
	116	{
	117	bmap->me_flags = 0;
	118	switch (type) {
	119	case XFS_BMAP_MAP:
	120	case XFS_BMAP_UNMAP:
	121	bmap->me_flags = type;
	122	break;
	123	default:
	124	ASSERT(0);
	125	}
	126	if (state == XFS_EXT_UNWRITTEN)
	127	bmap->me_flags \|= XFS_BMAP_EXTENT_UNWRITTEN;
	128	if (whichfork == XFS_ATTR_FORK)
	129	bmap->me_flags \|= XFS_BMAP_EXTENT_ATTR_FORK;
	130	}
	131
	132	/* Log bmap updates in the intent item. */
	133	STATIC void
	134	xfs_bmap_update_log_item(
	135	struct xfs_trans *tp,
136	void *intent,
137	struct list_head *item)
138	{
139	struct xfs_bui_log_item *buip = intent;
140	struct xfs_bmap_intent *bmap;
141	uint next_extent;
142	struct xfs_map_extent *map;
143
144	bmap = container_of(item, struct xfs_bmap_intent, bi_list);
145
146	tp->t_flags \|= XFS_TRANS_DIRTY;
e6631f85	147	set_bit(XFS_LI_DIRTY, &buip->bui_item.li_flags);
9f3afb57 DW	148
	149	/*
	150	* atomic_inc_return gives us the value after the increment;
	151	* we want to use it as an array index so we need to subtract 1 from
	152	* it.
	153	*/
	154	next_extent = atomic_inc_return(&buip->bui_next_extent) - 1;
	155	ASSERT(next_extent < buip->bui_format.bui_nextents);
	156	map = &buip->bui_format.bui_extents[next_extent];
	157	map->me_owner = bmap->bi_owner->i_ino;
	158	map->me_startblock = bmap->bi_bmap.br_startblock;
	159	map->me_startoff = bmap->bi_bmap.br_startoff;
	160	map->me_len = bmap->bi_bmap.br_blockcount;
	161	xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork,
	162	bmap->bi_bmap.br_state);
	163	}
	164
	165	/* Get an BUD so we can process all the deferred rmap updates. */
	166	STATIC void *
	167	xfs_bmap_update_create_done(
	168	struct xfs_trans *tp,
	169	void *intent,
	170	unsigned int count)
	171	{
	172	return xfs_trans_get_bud(tp, intent);
	173	}
	174
	175	/* Process a deferred rmap update. */
	176	STATIC int
	177	xfs_bmap_update_finish_item(
	178	struct xfs_trans *tp,
9f3afb57 DW	179	struct list_head *item,
	180	void *done_item,
	181	void **state)
	182	{
	183	struct xfs_bmap_intent *bmap;
e1a4e37c	184	xfs_filblks_t count;
9f3afb57 DW	185	int error;
	186
	187	bmap = container_of(item, struct xfs_bmap_intent, bi_list);
e1a4e37c	188	count = bmap->bi_bmap.br_blockcount;
7dbddbac	189	error = xfs_trans_log_finish_bmap_update(tp, done_item,
9f3afb57 DW	190	bmap->bi_type,
	191	bmap->bi_owner, bmap->bi_whichfork,
	192	bmap->bi_bmap.br_startoff,
	193	bmap->bi_bmap.br_startblock,
e1a4e37c	194	&count,
9f3afb57	195	bmap->bi_bmap.br_state);
e1a4e37c DW	196	if (!error && count > 0) {
	197	ASSERT(bmap->bi_type == XFS_BMAP_UNMAP);
	198	bmap->bi_bmap.br_blockcount = count;
	199	return -EAGAIN;
	200	}
9f3afb57 DW	201	kmem_free(bmap);
	202	return error;
	203	}
	204
	205	/* Abort all pending BUIs. */
	206	STATIC void
	207	xfs_bmap_update_abort_intent(
	208	void *intent)
	209	{
	210	xfs_bui_release(intent);
	211	}
	212
	213	/* Cancel a deferred rmap update. */
	214	STATIC void
	215	xfs_bmap_update_cancel_item(
	216	struct list_head *item)
	217	{
	218	struct xfs_bmap_intent *bmap;
	219
	220	bmap = container_of(item, struct xfs_bmap_intent, bi_list);
	221	kmem_free(bmap);
	222	}
	223
bc9f2b7c	224	const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
9f3afb57 DW	225	.max_items = XFS_BUI_MAX_FAST_EXTENTS,
	226	.diff_items = xfs_bmap_update_diff_items,
	227	.create_intent = xfs_bmap_update_create_intent,
	228	.abort_intent = xfs_bmap_update_abort_intent,
	229	.log_item = xfs_bmap_update_log_item,
	230	.create_done = xfs_bmap_update_create_done,
	231	.finish_item = xfs_bmap_update_finish_item,
	232	.cancel_item = xfs_bmap_update_cancel_item,
	233	};