xfs_extfree_item.c | Explore in Territory

// 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)
{ … }

STATIC void
xfs_efi_item_free(
	struct xfs_efi_log_item	*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)
{ … }

STATIC void
xfs_efi_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{ … }

/*
 * 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)
{ … }


/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)

{ … }

/*
 * 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)
{ … }

static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip)
{ … }

STATIC void
xfs_efd_item_free(struct xfs_efd_log_item *efdp)
{ … }

STATIC void
xfs_efd_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

static struct xfs_log_item *
xfs_efd_item_intent(
	struct xfs_log_item	*lip)
{ … }

static const struct xfs_item_ops xfs_efd_item_ops = …;

static inline struct xfs_extent_free_item *xefi_entry(const struct list_head *e)
{ … }

/*
 * Fill the EFD with all extents from the EFI when we need to roll the
 * transaction and continue with a new EFI.
 *
 * This simply copies all the extents in the EFI to the EFD rather than make
 * assumptions about which extents in the EFI have already been processed. We
 * currently keep the xefi list in the same order as the EFI extent list, but
 * that may not always be the case. Copying everything avoids leaving a landmine
 * were we fail to cancel all the extents in an EFI if the xefi list is
 * processed in a different order to the extents in the EFI.
 */
static void
xfs_efd_from_efi(
	struct xfs_efd_log_item	*efdp)
{ … }

static void
xfs_efd_add_extent(
	struct xfs_efd_log_item		*efdp,
	struct xfs_extent_free_item	*xefi)
{ … }

/* Sort bmap items by AG. */
static int
xfs_extent_free_diff_items(
	void				*priv,
	const struct list_head		*a,
	const struct list_head		*b)
{ … }

/* 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)
{ … }

static struct xfs_log_item *
xfs_extent_free_create_intent(
	struct xfs_trans		*tp,
	struct list_head		*items,
	unsigned int			count,
	bool				sort)
{ … }

/* 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)
{ … }

/* Add this deferred EFI to the transaction. */
void
xfs_extent_free_defer_add(
	struct xfs_trans		*tp,
	struct xfs_extent_free_item	*xefi,
	struct xfs_defer_pending	**dfpp)
{ … }

/* Cancel a free extent. */
STATIC void
xfs_extent_free_cancel_item(
	struct list_head		*item)
{ … }

/* 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)
{ … }

/* Abort all pending EFIs. */
STATIC void
xfs_extent_free_abort_intent(
	struct xfs_log_item		*intent)
{ … }

/*
 * 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)
{ … }

/* Is this recovered EFI ok? */
static inline bool
xfs_efi_validate_ext(
	struct xfs_mount		*mp,
	struct xfs_extent		*extp)
{ … }

static inline void
xfs_efi_recover_work(
	struct xfs_mount		*mp,
	struct xfs_defer_pending	*dfp,
	struct xfs_extent		*extp)
{ … }

/*
 * Process an extent free intent item that was recovered from
 * the log.  We need to free the extents that it describes.
 */
STATIC int
xfs_extent_free_recover_work(
	struct xfs_defer_pending	*dfp,
	struct list_head		*capture_list)
{ … }

/* Relog an intent item to push the log tail forward. */
static struct xfs_log_item *
xfs_extent_free_relog_intent(
	struct xfs_trans		*tp,
	struct xfs_log_item		*intent,
	struct xfs_log_item		*done_item)
{ … }

const struct xfs_defer_op_type xfs_extent_free_defer_type = …;

/* sub-type with special handling for AGFL deferred frees */
const struct xfs_defer_op_type xfs_agfl_free_defer_type = …;

STATIC bool
xfs_efi_item_match(
	struct xfs_log_item	*lip,
	uint64_t		intent_id)
{ … }

static const struct xfs_item_ops xfs_efi_item_ops = …;

/*
 * 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)
{ … }

const struct xlog_recover_item_ops xlog_efi_item_ops = …;

/*
 * 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)
{ … }

const struct xlog_recover_item_ops xlog_efd_item_ops = …;
linux/fs/xfs/xfs_extfree_item.c
