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linux/fs/xfs/xfs_extfree_item.c
Darrick J. Wong d5c88131db xfs: allow queued AG intents to drain before scrubbing 
When a writer thread executes a chain of log intent items, the AG header
buffer locks will cycle during a transaction roll to get from one intent
item to the next in a chain.  Although scrub takes all AG header buffer
locks, this isn't sufficient to guard against scrub checking an AG while
that writer thread is in the middle of finishing a chain because there's
no higher level locking primitive guarding allocation groups.

When there's a collision, cross-referencing between data structures
(e.g. rmapbt and refcountbt) yields false corruption events; if repair
is running, this results in incorrect repairs, which is catastrophic.

Fix this by adding to the perag structure the count of active intents
and make scrub wait until it has both AG header buffer locks and the
intent counter reaches zero.

One quirk of the drain code is that deferred bmap updates also bump and
drop the intent counter.  A fundamental decision made during the design
phase of the reverse mapping feature is that updates to the rmapbt
records are always made by the same code that updates the primary
metadata.  In other words, callers of bmapi functions expect that the
bmapi functions will queue deferred rmap updates.

Some parts of the reflink code queue deferred refcount (CUI) and bmap
(BUI) updates in the same head transaction, but the deferred work
manager completely finishes the CUI before the BUI work is started.  As
a result, the CUI drops the intent count long before the deferred rmap
(RUI) update even has a chance to bump the intent count.  The only way
to keep the intent count elevated between the CUI and RUI is for the BUI
to bump the counter until the RUI has been created.

A second quirk of the intent drain code is that deferred work items must
increment the intent counter as soon as the work item is added to the
transaction.  When a BUI completes and queues an RUI, the RUI must
increment the counter before the BUI decrements it.  The only way to
accomplish this is to require that the counter be bumped as soon as the
deferred work item is created in memory.

In the next patches we'll improve on this facility, but this patch
provides the basic functionality.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
2023-04-11 18:59:58 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_shared.h"
#include "xfs_mount.h"
#include "xfs_ag.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_extfree_item.h"
#include "xfs_log.h"
#include "xfs_btree.h"
#include "xfs_rmap.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_trace.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"
struct kmem_cache *xfs_efi_cache;
struct kmem_cache *xfs_efd_cache;
static const struct xfs_item_ops xfs_efi_item_ops;
static inline struct xfs_efi_log_item *EFI_ITEM(struct xfs_log_item *lip)
{
return container_of(lip, struct xfs_efi_log_item, efi_item);
}
STATIC void
xfs_efi_item_free(
struct xfs_efi_log_item *efip)
{
kmem_free(efip->efi_item.li_lv_shadow);
if (efip->efi_format.efi_nextents > XFS_EFI_MAX_FAST_EXTENTS)
kmem_free(efip);
else
kmem_cache_free(xfs_efi_cache, efip);
}
/*
* Freeing the efi requires that we remove it from the AIL if it has already
* been placed there. However, the EFI may not yet have been placed in the AIL
* when called by xfs_efi_release() from EFD processing due to the ordering of
* committed vs unpin operations in bulk insert operations. Hence the reference
* count to ensure only the last caller frees the EFI.
*/
STATIC void
xfs_efi_release(
struct xfs_efi_log_item *efip)
{
ASSERT(atomic_read(&efip->efi_refcount) > 0);
if (!atomic_dec_and_test(&efip->efi_refcount))
return;
xfs_trans_ail_delete(&efip->efi_item, 0);
xfs_efi_item_free(efip);
}
STATIC void
xfs_efi_item_size(
struct xfs_log_item *lip,
int *nvecs,
int *nbytes)
{
struct xfs_efi_log_item *efip = EFI_ITEM(lip);
*nvecs += 1;
*nbytes += xfs_efi_log_format_sizeof(efip->efi_format.efi_nextents);
}
/*
* This is called to fill in the vector of log iovecs for the
* given efi log item. We use only 1 iovec, and we point that
* at the efi_log_format structure embedded in the efi item.
* It is at this point that we assert that all of the extent
* slots in the efi item have been filled.
*/
STATIC void
xfs_efi_item_format(
struct xfs_log_item *lip,
struct xfs_log_vec *lv)
{
struct xfs_efi_log_item *efip = EFI_ITEM(lip);
struct xfs_log_iovec *vecp = NULL;
ASSERT(atomic_read(&efip->efi_next_extent) ==
efip->efi_format.efi_nextents);
efip->efi_format.efi_type = XFS_LI_EFI;
efip->efi_format.efi_size = 1;
xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFI_FORMAT,
&efip->efi_format,
xfs_efi_log_format_sizeof(efip->efi_format.efi_nextents));
}
/*
* The unpin operation is the last place an EFI is manipulated in the log. It is
* either inserted in the AIL or aborted in the event of a log I/O error. In
* either case, the EFI transaction has been successfully committed to make it
* this far. Therefore, we expect whoever committed the EFI to either construct
* and commit the EFD or drop the EFD's reference in the event of error. Simply
* drop the log's EFI reference now that the log is done with it.
*/
STATIC void
xfs_efi_item_unpin(
struct xfs_log_item *lip,
int remove)
{
struct xfs_efi_log_item *efip = EFI_ITEM(lip);
xfs_efi_release(efip);
}
/*
* The EFI has been either committed or aborted if the transaction has been
* cancelled. If the transaction was cancelled, an EFD isn't going to be
* constructed and thus we free the EFI here directly.
*/
STATIC void
xfs_efi_item_release(
struct xfs_log_item *lip)
{
xfs_efi_release(EFI_ITEM(lip));
}
/*
* Allocate and initialize an efi item with the given number of extents.
*/
STATIC struct xfs_efi_log_item *
xfs_efi_init(
struct xfs_mount *mp,
uint nextents)
{
struct xfs_efi_log_item *efip;
ASSERT(nextents > 0);
if (nextents > XFS_EFI_MAX_FAST_EXTENTS) {
efip = kzalloc(xfs_efi_log_item_sizeof(nextents),
GFP_KERNEL | __GFP_NOFAIL);
} else {
efip = kmem_cache_zalloc(xfs_efi_cache,
GFP_KERNEL | __GFP_NOFAIL);
}
xfs_log_item_init(mp, &efip->efi_item, XFS_LI_EFI, &xfs_efi_item_ops);
efip->efi_format.efi_nextents = nextents;
efip->efi_format.efi_id = (uintptr_t)(void *)efip;
atomic_set(&efip->efi_next_extent, 0);
atomic_set(&efip->efi_refcount, 2);
return efip;
}
/*
* Copy an EFI format buffer from the given buf, and into the destination
* EFI format structure.
* The given buffer can be in 32 bit or 64 bit form (which has different padding),
* one of which will be the native format for this kernel.
* It will handle the conversion of formats if necessary.
*/
STATIC int
xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt)
{
xfs_efi_log_format_t *src_efi_fmt = buf->i_addr;
uint i;
uint len = xfs_efi_log_format_sizeof(src_efi_fmt->efi_nextents);
uint len32 = xfs_efi_log_format32_sizeof(src_efi_fmt->efi_nextents);
uint len64 = xfs_efi_log_format64_sizeof(src_efi_fmt->efi_nextents);
if (buf->i_len == len) {
memcpy(dst_efi_fmt, src_efi_fmt,
offsetof(struct xfs_efi_log_format, efi_extents));
for (i = 0; i < src_efi_fmt->efi_nextents; i++)
memcpy(&dst_efi_fmt->efi_extents[i],
&src_efi_fmt->efi_extents[i],
sizeof(struct xfs_extent));
return 0;
} else if (buf->i_len == len32) {
xfs_efi_log_format_32_t *src_efi_fmt_32 = buf->i_addr;
dst_efi_fmt->efi_type = src_efi_fmt_32->efi_type;
dst_efi_fmt->efi_size = src_efi_fmt_32->efi_size;
dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents;
dst_efi_fmt->efi_id = src_efi_fmt_32->efi_id;
for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
dst_efi_fmt->efi_extents[i].ext_start =
src_efi_fmt_32->efi_extents[i].ext_start;
dst_efi_fmt->efi_extents[i].ext_len =
src_efi_fmt_32->efi_extents[i].ext_len;
}
return 0;
} else if (buf->i_len == len64) {
xfs_efi_log_format_64_t *src_efi_fmt_64 = buf->i_addr;
dst_efi_fmt->efi_type = src_efi_fmt_64->efi_type;
dst_efi_fmt->efi_size = src_efi_fmt_64->efi_size;
dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents;
dst_efi_fmt->efi_id = src_efi_fmt_64->efi_id;
for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
dst_efi_fmt->efi_extents[i].ext_start =
src_efi_fmt_64->efi_extents[i].ext_start;
dst_efi_fmt->efi_extents[i].ext_len =
src_efi_fmt_64->efi_extents[i].ext_len;
}
return 0;
}
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, NULL, buf->i_addr,
buf->i_len);
return -EFSCORRUPTED;
}
static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip)
{
return container_of(lip, struct xfs_efd_log_item, efd_item);
}
STATIC void
xfs_efd_item_free(struct xfs_efd_log_item *efdp)
{
kmem_free(efdp->efd_item.li_lv_shadow);
if (efdp->efd_format.efd_nextents > XFS_EFD_MAX_FAST_EXTENTS)
kmem_free(efdp);
else
kmem_cache_free(xfs_efd_cache, efdp);
}
STATIC void
xfs_efd_item_size(
struct xfs_log_item *lip,
int *nvecs,
int *nbytes)
{
struct xfs_efd_log_item *efdp = EFD_ITEM(lip);
*nvecs += 1;
*nbytes += xfs_efd_log_format_sizeof(efdp->efd_format.efd_nextents);
}
/*
* This is called to fill in the vector of log iovecs for the
* given efd log item. We use only 1 iovec, and we point that
* at the efd_log_format structure embedded in the efd item.
* It is at this point that we assert that all of the extent
* slots in the efd item have been filled.
*/
STATIC void
xfs_efd_item_format(
struct xfs_log_item *lip,
struct xfs_log_vec *lv)
{
struct xfs_efd_log_item *efdp = EFD_ITEM(lip);
struct xfs_log_iovec *vecp = NULL;
ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);
efdp->efd_format.efd_type = XFS_LI_EFD;
efdp->efd_format.efd_size = 1;
xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFD_FORMAT,
&efdp->efd_format,
xfs_efd_log_format_sizeof(efdp->efd_format.efd_nextents));
}
/*
* The EFD is either committed or aborted if the transaction is cancelled. If
* the transaction is cancelled, drop our reference to the EFI and free the EFD.
*/
STATIC void
xfs_efd_item_release(
struct xfs_log_item *lip)
{
struct xfs_efd_log_item *efdp = EFD_ITEM(lip);
xfs_efi_release(efdp->efd_efip);
xfs_efd_item_free(efdp);
}
static struct xfs_log_item *
xfs_efd_item_intent(
struct xfs_log_item *lip)
{
return &EFD_ITEM(lip)->efd_efip->efi_item;
}
static const struct xfs_item_ops xfs_efd_item_ops = {
.flags = XFS_ITEM_RELEASE_WHEN_COMMITTED |
XFS_ITEM_INTENT_DONE,
.iop_size = xfs_efd_item_size,
.iop_format = xfs_efd_item_format,
.iop_release = xfs_efd_item_release,
.iop_intent = xfs_efd_item_intent,
};
/*
* Allocate an "extent free done" log item that will hold nextents worth of
* extents. The caller must use all nextents extents, because we are not
* flexible about this at all.
*/
static struct xfs_efd_log_item *
xfs_trans_get_efd(
struct xfs_trans *tp,
struct xfs_efi_log_item *efip,
unsigned int nextents)
{
struct xfs_efd_log_item *efdp;
ASSERT(nextents > 0);
if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
efdp = kzalloc(xfs_efd_log_item_sizeof(nextents),
GFP_KERNEL | __GFP_NOFAIL);
} else {
efdp = kmem_cache_zalloc(xfs_efd_cache,
GFP_KERNEL | __GFP_NOFAIL);
}
xfs_log_item_init(tp->t_mountp, &efdp->efd_item, XFS_LI_EFD,
&xfs_efd_item_ops);
efdp->efd_efip = efip;
efdp->efd_format.efd_nextents = nextents;
efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;
xfs_trans_add_item(tp, &efdp->efd_item);
return efdp;
}
/*
* Free an extent and log it to the EFD. Note that the transaction is marked
* dirty regardless of whether the extent free succeeds or fails to support the
* EFI/EFD lifecycle rules.
*/
static int
xfs_trans_free_extent(
struct xfs_trans *tp,
struct xfs_efd_log_item *efdp,
struct xfs_extent_free_item *xefi)
{
struct xfs_owner_info oinfo = { };
struct xfs_mount *mp = tp->t_mountp;
struct xfs_extent *extp;
uint next_extent;
xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp,
xefi->xefi_startblock);
int error;
oinfo.oi_owner = xefi->xefi_owner;
if (xefi->xefi_flags & XFS_EFI_ATTR_FORK)
oinfo.oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
if (xefi->xefi_flags & XFS_EFI_BMBT_BLOCK)
oinfo.oi_flags |= XFS_OWNER_INFO_BMBT_BLOCK;
trace_xfs_bmap_free_deferred(tp->t_mountp, xefi->xefi_pag->pag_agno, 0,
agbno, xefi->xefi_blockcount);
error = __xfs_free_extent(tp, xefi->xefi_pag, agbno,
xefi->xefi_blockcount, &oinfo, XFS_AG_RESV_NONE,
xefi->xefi_flags & XFS_EFI_SKIP_DISCARD);
/*
* Mark the transaction dirty, even on error. This ensures the
* transaction is aborted, which:
*
* 1.) releases the EFI and frees the EFD
* 2.) shuts down the filesystem
*/
tp->t_flags |= XFS_TRANS_DIRTY | XFS_TRANS_HAS_INTENT_DONE;
set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);
next_extent = efdp->efd_next_extent;
ASSERT(next_extent < efdp->efd_format.efd_nextents);
extp = &(efdp->efd_format.efd_extents[next_extent]);
extp->ext_start = xefi->xefi_startblock;
extp->ext_len = xefi->xefi_blockcount;
efdp->efd_next_extent++;
return error;
}
/* Sort bmap items by AG. */
static int
xfs_extent_free_diff_items(
void *priv,
const struct list_head *a,
const struct list_head *b)
{
struct xfs_extent_free_item *ra;
struct xfs_extent_free_item *rb;
ra = container_of(a, struct xfs_extent_free_item, xefi_list);
rb = container_of(b, struct xfs_extent_free_item, xefi_list);
return ra->xefi_pag->pag_agno - rb->xefi_pag->pag_agno;
}
/* Log a free extent to the intent item. */
STATIC void
xfs_extent_free_log_item(
struct xfs_trans *tp,
struct xfs_efi_log_item *efip,
struct xfs_extent_free_item *xefi)
{
uint next_extent;
struct xfs_extent *extp;
tp->t_flags |= XFS_TRANS_DIRTY;
set_bit(XFS_LI_DIRTY, &efip->efi_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(&efip->efi_next_extent) - 1;
ASSERT(next_extent < efip->efi_format.efi_nextents);
extp = &efip->efi_format.efi_extents[next_extent];
extp->ext_start = xefi->xefi_startblock;
extp->ext_len = xefi->xefi_blockcount;
}
static struct xfs_log_item *
xfs_extent_free_create_intent(
struct xfs_trans *tp,
struct list_head *items,
unsigned int count,
bool sort)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_efi_log_item *efip = xfs_efi_init(mp, count);
struct xfs_extent_free_item *xefi;
ASSERT(count > 0);
xfs_trans_add_item(tp, &efip->efi_item);
if (sort)
list_sort(mp, items, xfs_extent_free_diff_items);
list_for_each_entry(xefi, items, xefi_list)
xfs_extent_free_log_item(tp, efip, xefi);
return &efip->efi_item;
}
/* Get an EFD so we can process all the free extents. */
static struct xfs_log_item *
xfs_extent_free_create_done(
struct xfs_trans *tp,
struct xfs_log_item *intent,
unsigned int count)
{
return &xfs_trans_get_efd(tp, EFI_ITEM(intent), count)->efd_item;
}
/* Take a passive ref to the AG containing the space we're freeing. */
void
xfs_extent_free_get_group(
struct xfs_mount *mp,
struct xfs_extent_free_item *xefi)
{
xfs_agnumber_t agno;
agno = XFS_FSB_TO_AGNO(mp, xefi->xefi_startblock);
xefi->xefi_pag = xfs_perag_intent_get(mp, agno);
}
/* Release a passive AG ref after some freeing work. */
static inline void
xfs_extent_free_put_group(
struct xfs_extent_free_item *xefi)
{
xfs_perag_intent_put(xefi->xefi_pag);
}
/* Process a free extent. */
STATIC int
xfs_extent_free_finish_item(
struct xfs_trans *tp,
struct xfs_log_item *done,
struct list_head *item,
struct xfs_btree_cur **state)
{
struct xfs_extent_free_item *xefi;
int error;
xefi = container_of(item, struct xfs_extent_free_item, xefi_list);
error = xfs_trans_free_extent(tp, EFD_ITEM(done), xefi);
xfs_extent_free_put_group(xefi);
kmem_cache_free(xfs_extfree_item_cache, xefi);
return error;
}
/* Abort all pending EFIs. */
STATIC void
xfs_extent_free_abort_intent(
struct xfs_log_item *intent)
{
xfs_efi_release(EFI_ITEM(intent));
}
/* Cancel a free extent. */
STATIC void
xfs_extent_free_cancel_item(
struct list_head *item)
{
struct xfs_extent_free_item *xefi;
xefi = container_of(item, struct xfs_extent_free_item, xefi_list);
xfs_extent_free_put_group(xefi);
kmem_cache_free(xfs_extfree_item_cache, xefi);
}
const struct xfs_defer_op_type xfs_extent_free_defer_type = {
.max_items = XFS_EFI_MAX_FAST_EXTENTS,
.create_intent = xfs_extent_free_create_intent,
.abort_intent = xfs_extent_free_abort_intent,
.create_done = xfs_extent_free_create_done,
.finish_item = xfs_extent_free_finish_item,
.cancel_item = xfs_extent_free_cancel_item,
};
/*
* AGFL blocks are accounted differently in the reserve pools and are not
* inserted into the busy extent list.
*/
STATIC int
xfs_agfl_free_finish_item(
struct xfs_trans *tp,
struct xfs_log_item *done,
struct list_head *item,
struct xfs_btree_cur **state)
{
struct xfs_owner_info oinfo = { };
struct xfs_mount *mp = tp->t_mountp;
struct xfs_efd_log_item *efdp = EFD_ITEM(done);
struct xfs_extent_free_item *xefi;
struct xfs_extent *extp;
struct xfs_buf *agbp;
int error;
xfs_agblock_t agbno;
uint next_extent;
xefi = container_of(item, struct xfs_extent_free_item, xefi_list);
ASSERT(xefi->xefi_blockcount == 1);
agbno = XFS_FSB_TO_AGBNO(mp, xefi->xefi_startblock);
oinfo.oi_owner = xefi->xefi_owner;
trace_xfs_agfl_free_deferred(mp, xefi->xefi_pag->pag_agno, 0, agbno,
xefi->xefi_blockcount);
error = xfs_alloc_read_agf(xefi->xefi_pag, tp, 0, &agbp);
if (!error)
error = xfs_free_agfl_block(tp, xefi->xefi_pag->pag_agno,
agbno, agbp, &oinfo);
/*
* Mark the transaction dirty, even on error. This ensures the
* transaction is aborted, which:
*
* 1.) releases the EFI and frees the EFD
* 2.) shuts down the filesystem
*/
tp->t_flags |= XFS_TRANS_DIRTY;
set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);
next_extent = efdp->efd_next_extent;
ASSERT(next_extent < efdp->efd_format.efd_nextents);
extp = &(efdp->efd_format.efd_extents[next_extent]);
extp->ext_start = xefi->xefi_startblock;
extp->ext_len = xefi->xefi_blockcount;
efdp->efd_next_extent++;
xfs_extent_free_put_group(xefi);
kmem_cache_free(xfs_extfree_item_cache, xefi);
return error;
}
/* sub-type with special handling for AGFL deferred frees */
const struct xfs_defer_op_type xfs_agfl_free_defer_type = {
.max_items = XFS_EFI_MAX_FAST_EXTENTS,
.create_intent = xfs_extent_free_create_intent,
.abort_intent = xfs_extent_free_abort_intent,
.create_done = xfs_extent_free_create_done,
.finish_item = xfs_agfl_free_finish_item,
.cancel_item = xfs_extent_free_cancel_item,
};
/* Is this recovered EFI ok? */
static inline bool
xfs_efi_validate_ext(
struct xfs_mount *mp,
struct xfs_extent *extp)
{
return xfs_verify_fsbext(mp, extp->ext_start, extp->ext_len);
}
/*
* Process an extent free intent item that was recovered from
* the log. We need to free the extents that it describes.
*/
STATIC int
xfs_efi_item_recover(
struct xfs_log_item *lip,
struct list_head *capture_list)
{
struct xfs_efi_log_item *efip = EFI_ITEM(lip);
struct xfs_mount *mp = lip->li_log->l_mp;
struct xfs_efd_log_item *efdp;
struct xfs_trans *tp;
int i;
int error = 0;
/*
* First check the validity of the extents described by the
* EFI. If any are bad, then assume that all are bad and
* just toss the EFI.
*/
for (i = 0; i < efip->efi_format.efi_nextents; i++) {
if (!xfs_efi_validate_ext(mp,
&efip->efi_format.efi_extents[i])) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
&efip->efi_format,
sizeof(efip->efi_format));
return -EFSCORRUPTED;
}
}
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
if (error)
return error;
efdp = xfs_trans_get_efd(tp, efip, efip->efi_format.efi_nextents);
for (i = 0; i < efip->efi_format.efi_nextents; i++) {
struct xfs_extent_free_item fake = {
.xefi_owner = XFS_RMAP_OWN_UNKNOWN,
};
struct xfs_extent *extp;
extp = &efip->efi_format.efi_extents[i];
fake.xefi_startblock = extp->ext_start;
fake.xefi_blockcount = extp->ext_len;
xfs_extent_free_get_group(mp, &fake);
error = xfs_trans_free_extent(tp, efdp, &fake);
xfs_extent_free_put_group(&fake);
if (error == -EFSCORRUPTED)
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
extp, sizeof(*extp));
if (error)
goto abort_error;
}
return xfs_defer_ops_capture_and_commit(tp, capture_list);
abort_error:
xfs_trans_cancel(tp);
return error;
}
STATIC bool
xfs_efi_item_match(
struct xfs_log_item *lip,
uint64_t intent_id)
{
return EFI_ITEM(lip)->efi_format.efi_id == intent_id;
}
/* Relog an intent item to push the log tail forward. */
static struct xfs_log_item *
xfs_efi_item_relog(
struct xfs_log_item *intent,
struct xfs_trans *tp)
{
struct xfs_efd_log_item *efdp;
struct xfs_efi_log_item *efip;
struct xfs_extent *extp;
unsigned int count;
count = EFI_ITEM(intent)->efi_format.efi_nextents;
extp = EFI_ITEM(intent)->efi_format.efi_extents;
tp->t_flags |= XFS_TRANS_DIRTY;
efdp = xfs_trans_get_efd(tp, EFI_ITEM(intent), count);
efdp->efd_next_extent = count;
memcpy(efdp->efd_format.efd_extents, extp, count * sizeof(*extp));
set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);
efip = xfs_efi_init(tp->t_mountp, count);
memcpy(efip->efi_format.efi_extents, extp, count * sizeof(*extp));
atomic_set(&efip->efi_next_extent, count);
xfs_trans_add_item(tp, &efip->efi_item);
set_bit(XFS_LI_DIRTY, &efip->efi_item.li_flags);
return &efip->efi_item;
}
static const struct xfs_item_ops xfs_efi_item_ops = {
.flags = XFS_ITEM_INTENT,
.iop_size = xfs_efi_item_size,
.iop_format = xfs_efi_item_format,
.iop_unpin = xfs_efi_item_unpin,
.iop_release = xfs_efi_item_release,
.iop_recover = xfs_efi_item_recover,
.iop_match = xfs_efi_item_match,
.iop_relog = xfs_efi_item_relog,
};
/*
* This routine is called to create an in-core extent free intent
* item from the efi format structure which was logged on disk.
* It allocates an in-core efi, copies the extents from the format
* structure into it, and adds the efi to the AIL with the given
* LSN.
*/
STATIC int
xlog_recover_efi_commit_pass2(
struct xlog *log,
struct list_head *buffer_list,
struct xlog_recover_item *item,
xfs_lsn_t lsn)
{
struct xfs_mount *mp = log->l_mp;
struct xfs_efi_log_item *efip;
struct xfs_efi_log_format *efi_formatp;
int error;
efi_formatp = item->ri_buf[0].i_addr;
if (item->ri_buf[0].i_len < xfs_efi_log_format_sizeof(0)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
return -EFSCORRUPTED;
}
efip = xfs_efi_init(mp, efi_formatp->efi_nextents);
error = xfs_efi_copy_format(&item->ri_buf[0], &efip->efi_format);
if (error) {
xfs_efi_item_free(efip);
return error;
}
atomic_set(&efip->efi_next_extent, efi_formatp->efi_nextents);
/*
* Insert the intent into the AIL directly and drop one reference so
* that finishing or canceling the work will drop the other.
*/
xfs_trans_ail_insert(log->l_ailp, &efip->efi_item, lsn);
xfs_efi_release(efip);
return 0;
}
const struct xlog_recover_item_ops xlog_efi_item_ops = {
.item_type = XFS_LI_EFI,
.commit_pass2 = xlog_recover_efi_commit_pass2,
};
/*
* This routine is called when an EFD format structure is found in a committed
* transaction in the log. Its purpose is to cancel the corresponding EFI if it
* was still in the log. To do this it searches the AIL for the EFI with an id
* equal to that in the EFD format structure. If we find it we drop the EFD
* reference, which removes the EFI from the AIL and frees it.
*/
STATIC int
xlog_recover_efd_commit_pass2(
struct xlog *log,
struct list_head *buffer_list,
struct xlog_recover_item *item,
xfs_lsn_t lsn)
{
struct xfs_efd_log_format *efd_formatp;
int buflen = item->ri_buf[0].i_len;
efd_formatp = item->ri_buf[0].i_addr;
if (buflen < sizeof(struct xfs_efd_log_format)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
efd_formatp, buflen);
return -EFSCORRUPTED;
}
if (item->ri_buf[0].i_len != xfs_efd_log_format32_sizeof(
efd_formatp->efd_nextents) &&
item->ri_buf[0].i_len != xfs_efd_log_format64_sizeof(
efd_formatp->efd_nextents)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
efd_formatp, buflen);
return -EFSCORRUPTED;
}
xlog_recover_release_intent(log, XFS_LI_EFI, efd_formatp->efd_efi_id);
return 0;
}
const struct xlog_recover_item_ops xlog_efd_item_ops = {
.item_type = XFS_LI_EFD,
.commit_pass2 = xlog_recover_efd_commit_pass2,
};
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