310 lines
8.2 KiB
C
310 lines
8.2 KiB
C
/*
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* Copyright (c) 2000,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_extfree_item.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_trace.h"
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/*
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* This routine is called to allocate an "extent free done"
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* log item that will hold nextents worth of extents. The
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* caller must use all nextents extents, because we are not
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* flexible about this at all.
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*/
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struct xfs_efd_log_item *
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xfs_trans_get_efd(struct xfs_trans *tp,
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struct xfs_efi_log_item *efip,
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uint nextents)
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{
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struct xfs_efd_log_item *efdp;
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ASSERT(tp != NULL);
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ASSERT(nextents > 0);
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efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
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ASSERT(efdp != NULL);
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/*
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* Get a log_item_desc to point at the new item.
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*/
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xfs_trans_add_item(tp, &efdp->efd_item);
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return efdp;
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}
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/*
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* Free an extent and log it to the EFD. Note that the transaction is marked
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* dirty regardless of whether the extent free succeeds or fails to support the
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* EFI/EFD lifecycle rules.
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*/
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int
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xfs_trans_free_extent(
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struct xfs_trans *tp,
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struct xfs_efd_log_item *efdp,
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xfs_fsblock_t start_block,
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xfs_extlen_t ext_len,
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struct xfs_owner_info *oinfo,
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bool skip_discard)
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{
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struct xfs_mount *mp = tp->t_mountp;
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uint next_extent;
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xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, start_block);
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xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, start_block);
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struct xfs_extent *extp;
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int error;
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trace_xfs_bmap_free_deferred(tp->t_mountp, agno, 0, agbno, ext_len);
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error = __xfs_free_extent(tp, start_block, ext_len,
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oinfo, XFS_AG_RESV_NONE, skip_discard);
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/*
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* Mark the transaction dirty, even on error. This ensures the
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* transaction is aborted, which:
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*
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* 1.) releases the EFI and frees the EFD
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* 2.) shuts down the filesystem
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*/
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tp->t_flags |= XFS_TRANS_DIRTY;
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set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);
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next_extent = efdp->efd_next_extent;
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ASSERT(next_extent < efdp->efd_format.efd_nextents);
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extp = &(efdp->efd_format.efd_extents[next_extent]);
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extp->ext_start = start_block;
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extp->ext_len = ext_len;
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efdp->efd_next_extent++;
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return error;
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}
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/* Sort bmap items by AG. */
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static int
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xfs_extent_free_diff_items(
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void *priv,
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struct list_head *a,
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struct list_head *b)
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{
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struct xfs_mount *mp = priv;
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struct xfs_extent_free_item *ra;
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struct xfs_extent_free_item *rb;
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ra = container_of(a, struct xfs_extent_free_item, xefi_list);
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rb = container_of(b, struct xfs_extent_free_item, xefi_list);
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return XFS_FSB_TO_AGNO(mp, ra->xefi_startblock) -
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XFS_FSB_TO_AGNO(mp, rb->xefi_startblock);
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}
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/* Get an EFI. */
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STATIC void *
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xfs_extent_free_create_intent(
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struct xfs_trans *tp,
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unsigned int count)
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{
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struct xfs_efi_log_item *efip;
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ASSERT(tp != NULL);
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ASSERT(count > 0);
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efip = xfs_efi_init(tp->t_mountp, count);
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ASSERT(efip != NULL);
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/*
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* Get a log_item_desc to point at the new item.
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*/
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xfs_trans_add_item(tp, &efip->efi_item);
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return efip;
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}
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/* Log a free extent to the intent item. */
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STATIC void
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xfs_extent_free_log_item(
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struct xfs_trans *tp,
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void *intent,
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struct list_head *item)
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{
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struct xfs_efi_log_item *efip = intent;
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struct xfs_extent_free_item *free;
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uint next_extent;
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struct xfs_extent *extp;
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free = container_of(item, struct xfs_extent_free_item, xefi_list);
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tp->t_flags |= XFS_TRANS_DIRTY;
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set_bit(XFS_LI_DIRTY, &efip->efi_item.li_flags);
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/*
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* atomic_inc_return gives us the value after the increment;
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* we want to use it as an array index so we need to subtract 1 from
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* it.
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*/
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next_extent = atomic_inc_return(&efip->efi_next_extent) - 1;
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ASSERT(next_extent < efip->efi_format.efi_nextents);
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extp = &efip->efi_format.efi_extents[next_extent];
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extp->ext_start = free->xefi_startblock;
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extp->ext_len = free->xefi_blockcount;
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}
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/* Get an EFD so we can process all the free extents. */
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STATIC void *
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xfs_extent_free_create_done(
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struct xfs_trans *tp,
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void *intent,
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unsigned int count)
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{
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return xfs_trans_get_efd(tp, intent, count);
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}
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/* Process a free extent. */
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STATIC int
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xfs_extent_free_finish_item(
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struct xfs_trans *tp,
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struct xfs_defer_ops *dop,
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struct list_head *item,
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void *done_item,
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void **state)
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{
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struct xfs_extent_free_item *free;
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int error;
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free = container_of(item, struct xfs_extent_free_item, xefi_list);
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error = xfs_trans_free_extent(tp, done_item,
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free->xefi_startblock,
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free->xefi_blockcount,
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&free->xefi_oinfo, free->xefi_skip_discard);
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kmem_free(free);
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return error;
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}
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/* Abort all pending EFIs. */
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STATIC void
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xfs_extent_free_abort_intent(
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void *intent)
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{
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xfs_efi_release(intent);
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}
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/* Cancel a free extent. */
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STATIC void
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xfs_extent_free_cancel_item(
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struct list_head *item)
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{
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struct xfs_extent_free_item *free;
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free = container_of(item, struct xfs_extent_free_item, xefi_list);
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kmem_free(free);
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}
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static const struct xfs_defer_op_type xfs_extent_free_defer_type = {
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.type = XFS_DEFER_OPS_TYPE_FREE,
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.max_items = XFS_EFI_MAX_FAST_EXTENTS,
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.diff_items = xfs_extent_free_diff_items,
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.create_intent = xfs_extent_free_create_intent,
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.abort_intent = xfs_extent_free_abort_intent,
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.log_item = xfs_extent_free_log_item,
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.create_done = xfs_extent_free_create_done,
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.finish_item = xfs_extent_free_finish_item,
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.cancel_item = xfs_extent_free_cancel_item,
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};
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/*
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* AGFL blocks are accounted differently in the reserve pools and are not
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* inserted into the busy extent list.
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*/
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STATIC int
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xfs_agfl_free_finish_item(
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struct xfs_trans *tp,
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struct xfs_defer_ops *dop,
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struct list_head *item,
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void *done_item,
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void **state)
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{
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struct xfs_mount *mp = tp->t_mountp;
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struct xfs_efd_log_item *efdp = done_item;
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struct xfs_extent_free_item *free;
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struct xfs_extent *extp;
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struct xfs_buf *agbp;
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int error;
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xfs_agnumber_t agno;
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xfs_agblock_t agbno;
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uint next_extent;
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free = container_of(item, struct xfs_extent_free_item, xefi_list);
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ASSERT(free->xefi_blockcount == 1);
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agno = XFS_FSB_TO_AGNO(mp, free->xefi_startblock);
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agbno = XFS_FSB_TO_AGBNO(mp, free->xefi_startblock);
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trace_xfs_agfl_free_deferred(mp, agno, 0, agbno, free->xefi_blockcount);
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error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp);
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if (!error)
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error = xfs_free_agfl_block(tp, agno, agbno, agbp,
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&free->xefi_oinfo);
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/*
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* Mark the transaction dirty, even on error. This ensures the
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* transaction is aborted, which:
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*
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* 1.) releases the EFI and frees the EFD
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* 2.) shuts down the filesystem
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*/
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tp->t_flags |= XFS_TRANS_DIRTY;
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set_bit(XFS_LI_DIRTY, &efdp->efd_item.li_flags);
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next_extent = efdp->efd_next_extent;
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ASSERT(next_extent < efdp->efd_format.efd_nextents);
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extp = &(efdp->efd_format.efd_extents[next_extent]);
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extp->ext_start = free->xefi_startblock;
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extp->ext_len = free->xefi_blockcount;
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efdp->efd_next_extent++;
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kmem_free(free);
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return error;
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}
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/* sub-type with special handling for AGFL deferred frees */
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static const struct xfs_defer_op_type xfs_agfl_free_defer_type = {
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.type = XFS_DEFER_OPS_TYPE_AGFL_FREE,
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.max_items = XFS_EFI_MAX_FAST_EXTENTS,
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.diff_items = xfs_extent_free_diff_items,
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.create_intent = xfs_extent_free_create_intent,
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.abort_intent = xfs_extent_free_abort_intent,
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.log_item = xfs_extent_free_log_item,
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.create_done = xfs_extent_free_create_done,
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.finish_item = xfs_agfl_free_finish_item,
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.cancel_item = xfs_extent_free_cancel_item,
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};
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/* Register the deferred op type. */
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void
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xfs_extent_free_init_defer_op(void)
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{
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xfs_defer_init_op_type(&xfs_extent_free_defer_type);
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xfs_defer_init_op_type(&xfs_agfl_free_defer_type);
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}
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