linux/fs/xfs/xfs_trans_refcount.c
Dave Chinner 0b61f8a407 xfs: convert to SPDX license tags
Remove the verbose license text from XFS files and replace them
with SPDX tags. This does not change the license of any of the code,
merely refers to the common, up-to-date license files in LICENSES/

This change was mostly scripted. fs/xfs/Makefile and
fs/xfs/libxfs/xfs_fs.h were modified by hand, the rest were detected
and modified by the following command:

for f in `git grep -l "GNU General" fs/xfs/` ; do
	echo $f
	cat $f | awk -f hdr.awk > $f.new
	mv -f $f.new $f
done

And the hdr.awk script that did the modification (including
detecting the difference between GPL-2.0 and GPL-2.0+ licenses)
is as follows:

$ cat hdr.awk
BEGIN {
	hdr = 1.0
	tag = "GPL-2.0"
	str = ""
}

/^ \* This program is free software/ {
	hdr = 2.0;
	next
}

/any later version./ {
	tag = "GPL-2.0+"
	next
}

/^ \*\// {
	if (hdr > 0.0) {
		print "// SPDX-License-Identifier: " tag
		print str
		print $0
		str=""
		hdr = 0.0
		next
	}
	print $0
	next
}

/^ \* / {
	if (hdr > 1.0)
		next
	if (hdr > 0.0) {
		if (str != "")
			str = str "\n"
		str = str $0
		next
	}
	print $0
	next
}

/^ \*/ {
	if (hdr > 0.0)
		next
	print $0
	next
}

// {
	if (hdr > 0.0) {
		if (str != "")
			str = str "\n"
		str = str $0
		next
	}
	print $0
}

END { }
$

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2018-06-06 14:17:53 -07:00

251 lines
6.1 KiB
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_refcount_item.h"
#include "xfs_alloc.h"
#include "xfs_refcount.h"
/*
* This routine is called to allocate a "refcount update done"
* log item.
*/
struct xfs_cud_log_item *
xfs_trans_get_cud(
struct xfs_trans *tp,
struct xfs_cui_log_item *cuip)
{
struct xfs_cud_log_item *cudp;
cudp = xfs_cud_init(tp->t_mountp, cuip);
xfs_trans_add_item(tp, &cudp->cud_item);
return cudp;
}
/*
* Finish an refcount update and log it to the CUD. Note that the
* transaction is marked dirty regardless of whether the refcount
* update succeeds or fails to support the CUI/CUD lifecycle rules.
*/
int
xfs_trans_log_finish_refcount_update(
struct xfs_trans *tp,
struct xfs_cud_log_item *cudp,
struct xfs_defer_ops *dop,
enum xfs_refcount_intent_type type,
xfs_fsblock_t startblock,
xfs_extlen_t blockcount,
xfs_fsblock_t *new_fsb,
xfs_extlen_t *new_len,
struct xfs_btree_cur **pcur)
{
int error;
error = xfs_refcount_finish_one(tp, dop, type, startblock,
blockcount, new_fsb, new_len, pcur);
/*
* Mark the transaction dirty, even on error. This ensures the
* transaction is aborted, which:
*
* 1.) releases the CUI and frees the CUD
* 2.) shuts down the filesystem
*/
tp->t_flags |= XFS_TRANS_DIRTY;
set_bit(XFS_LI_DIRTY, &cudp->cud_item.li_flags);
return error;
}
/* Sort refcount intents by AG. */
static int
xfs_refcount_update_diff_items(
void *priv,
struct list_head *a,
struct list_head *b)
{
struct xfs_mount *mp = priv;
struct xfs_refcount_intent *ra;
struct xfs_refcount_intent *rb;
ra = container_of(a, struct xfs_refcount_intent, ri_list);
rb = container_of(b, struct xfs_refcount_intent, ri_list);
return XFS_FSB_TO_AGNO(mp, ra->ri_startblock) -
XFS_FSB_TO_AGNO(mp, rb->ri_startblock);
}
/* Get an CUI. */
STATIC void *
xfs_refcount_update_create_intent(
struct xfs_trans *tp,
unsigned int count)
{
struct xfs_cui_log_item *cuip;
ASSERT(tp != NULL);
ASSERT(count > 0);
cuip = xfs_cui_init(tp->t_mountp, count);
ASSERT(cuip != NULL);
/*
* Get a log_item_desc to point at the new item.
*/
xfs_trans_add_item(tp, &cuip->cui_item);
return cuip;
}
/* Set the phys extent flags for this reverse mapping. */
static void
xfs_trans_set_refcount_flags(
struct xfs_phys_extent *refc,
enum xfs_refcount_intent_type type)
{
refc->pe_flags = 0;
switch (type) {
case XFS_REFCOUNT_INCREASE:
case XFS_REFCOUNT_DECREASE:
case XFS_REFCOUNT_ALLOC_COW:
case XFS_REFCOUNT_FREE_COW:
refc->pe_flags |= type;
break;
default:
ASSERT(0);
}
}
/* Log refcount updates in the intent item. */
STATIC void
xfs_refcount_update_log_item(
struct xfs_trans *tp,
void *intent,
struct list_head *item)
{
struct xfs_cui_log_item *cuip = intent;
struct xfs_refcount_intent *refc;
uint next_extent;
struct xfs_phys_extent *ext;
refc = container_of(item, struct xfs_refcount_intent, ri_list);
tp->t_flags |= XFS_TRANS_DIRTY;
set_bit(XFS_LI_DIRTY, &cuip->cui_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(&cuip->cui_next_extent) - 1;
ASSERT(next_extent < cuip->cui_format.cui_nextents);
ext = &cuip->cui_format.cui_extents[next_extent];
ext->pe_startblock = refc->ri_startblock;
ext->pe_len = refc->ri_blockcount;
xfs_trans_set_refcount_flags(ext, refc->ri_type);
}
/* Get an CUD so we can process all the deferred refcount updates. */
STATIC void *
xfs_refcount_update_create_done(
struct xfs_trans *tp,
void *intent,
unsigned int count)
{
return xfs_trans_get_cud(tp, intent);
}
/* Process a deferred refcount update. */
STATIC int
xfs_refcount_update_finish_item(
struct xfs_trans *tp,
struct xfs_defer_ops *dop,
struct list_head *item,
void *done_item,
void **state)
{
struct xfs_refcount_intent *refc;
xfs_fsblock_t new_fsb;
xfs_extlen_t new_aglen;
int error;
refc = container_of(item, struct xfs_refcount_intent, ri_list);
error = xfs_trans_log_finish_refcount_update(tp, done_item, dop,
refc->ri_type,
refc->ri_startblock,
refc->ri_blockcount,
&new_fsb, &new_aglen,
(struct xfs_btree_cur **)state);
/* Did we run out of reservation? Requeue what we didn't finish. */
if (!error && new_aglen > 0) {
ASSERT(refc->ri_type == XFS_REFCOUNT_INCREASE ||
refc->ri_type == XFS_REFCOUNT_DECREASE);
refc->ri_startblock = new_fsb;
refc->ri_blockcount = new_aglen;
return -EAGAIN;
}
kmem_free(refc);
return error;
}
/* Clean up after processing deferred refcounts. */
STATIC void
xfs_refcount_update_finish_cleanup(
struct xfs_trans *tp,
void *state,
int error)
{
struct xfs_btree_cur *rcur = state;
xfs_refcount_finish_one_cleanup(tp, rcur, error);
}
/* Abort all pending CUIs. */
STATIC void
xfs_refcount_update_abort_intent(
void *intent)
{
xfs_cui_release(intent);
}
/* Cancel a deferred refcount update. */
STATIC void
xfs_refcount_update_cancel_item(
struct list_head *item)
{
struct xfs_refcount_intent *refc;
refc = container_of(item, struct xfs_refcount_intent, ri_list);
kmem_free(refc);
}
static const struct xfs_defer_op_type xfs_refcount_update_defer_type = {
.type = XFS_DEFER_OPS_TYPE_REFCOUNT,
.max_items = XFS_CUI_MAX_FAST_EXTENTS,
.diff_items = xfs_refcount_update_diff_items,
.create_intent = xfs_refcount_update_create_intent,
.abort_intent = xfs_refcount_update_abort_intent,
.log_item = xfs_refcount_update_log_item,
.create_done = xfs_refcount_update_create_done,
.finish_item = xfs_refcount_update_finish_item,
.finish_cleanup = xfs_refcount_update_finish_cleanup,
.cancel_item = xfs_refcount_update_cancel_item,
};
/* Register the deferred op type. */
void
xfs_refcount_update_init_defer_op(void)
{
xfs_defer_init_op_type(&xfs_refcount_update_defer_type);
}