257 lines
6.4 KiB
C
257 lines
6.4 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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_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_bmap_item.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_inode.h"
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/*
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* This routine is called to allocate a "bmap update done"
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* log item.
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*/
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struct xfs_bud_log_item *
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xfs_trans_get_bud(
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struct xfs_trans *tp,
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struct xfs_bui_log_item *buip)
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{
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struct xfs_bud_log_item *budp;
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budp = xfs_bud_init(tp->t_mountp, buip);
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xfs_trans_add_item(tp, &budp->bud_item);
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return budp;
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}
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/*
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* Finish an bmap update and log it to the BUD. Note that the
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* transaction is marked dirty regardless of whether the bmap update
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* succeeds or fails to support the BUI/BUD lifecycle rules.
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*/
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int
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xfs_trans_log_finish_bmap_update(
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struct xfs_trans *tp,
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struct xfs_bud_log_item *budp,
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struct xfs_defer_ops *dop,
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enum xfs_bmap_intent_type type,
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struct xfs_inode *ip,
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int whichfork,
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xfs_fileoff_t startoff,
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xfs_fsblock_t startblock,
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xfs_filblks_t *blockcount,
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xfs_exntst_t state)
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{
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int error;
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error = xfs_bmap_finish_one(tp, dop, ip, type, whichfork, startoff,
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startblock, blockcount, state);
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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 BUI and frees the BUD
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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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budp->bud_item.li_desc->lid_flags |= XFS_LID_DIRTY;
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return error;
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}
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/* Sort bmap intents by inode. */
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static int
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xfs_bmap_update_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_bmap_intent *ba;
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struct xfs_bmap_intent *bb;
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ba = container_of(a, struct xfs_bmap_intent, bi_list);
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bb = container_of(b, struct xfs_bmap_intent, bi_list);
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return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
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}
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/* Get an BUI. */
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STATIC void *
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xfs_bmap_update_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_bui_log_item *buip;
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ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);
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ASSERT(tp != NULL);
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buip = xfs_bui_init(tp->t_mountp);
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ASSERT(buip != 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, &buip->bui_item);
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return buip;
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}
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/* Set the map extent flags for this mapping. */
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static void
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xfs_trans_set_bmap_flags(
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struct xfs_map_extent *bmap,
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enum xfs_bmap_intent_type type,
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int whichfork,
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xfs_exntst_t state)
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{
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bmap->me_flags = 0;
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switch (type) {
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case XFS_BMAP_MAP:
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case XFS_BMAP_UNMAP:
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bmap->me_flags = type;
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break;
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default:
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ASSERT(0);
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}
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if (state == XFS_EXT_UNWRITTEN)
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bmap->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN;
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if (whichfork == XFS_ATTR_FORK)
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bmap->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK;
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}
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/* Log bmap updates in the intent item. */
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STATIC void
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xfs_bmap_update_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_bui_log_item *buip = intent;
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struct xfs_bmap_intent *bmap;
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uint next_extent;
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struct xfs_map_extent *map;
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bmap = container_of(item, struct xfs_bmap_intent, bi_list);
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tp->t_flags |= XFS_TRANS_DIRTY;
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buip->bui_item.li_desc->lid_flags |= XFS_LID_DIRTY;
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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(&buip->bui_next_extent) - 1;
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ASSERT(next_extent < buip->bui_format.bui_nextents);
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map = &buip->bui_format.bui_extents[next_extent];
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map->me_owner = bmap->bi_owner->i_ino;
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map->me_startblock = bmap->bi_bmap.br_startblock;
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map->me_startoff = bmap->bi_bmap.br_startoff;
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map->me_len = bmap->bi_bmap.br_blockcount;
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xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork,
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bmap->bi_bmap.br_state);
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}
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/* Get an BUD so we can process all the deferred rmap updates. */
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STATIC void *
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xfs_bmap_update_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_bud(tp, intent);
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}
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/* Process a deferred rmap update. */
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STATIC int
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xfs_bmap_update_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_bmap_intent *bmap;
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xfs_filblks_t count;
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int error;
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bmap = container_of(item, struct xfs_bmap_intent, bi_list);
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count = bmap->bi_bmap.br_blockcount;
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error = xfs_trans_log_finish_bmap_update(tp, done_item, dop,
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bmap->bi_type,
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bmap->bi_owner, bmap->bi_whichfork,
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bmap->bi_bmap.br_startoff,
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bmap->bi_bmap.br_startblock,
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&count,
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bmap->bi_bmap.br_state);
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if (!error && count > 0) {
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ASSERT(bmap->bi_type == XFS_BMAP_UNMAP);
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bmap->bi_bmap.br_blockcount = count;
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return -EAGAIN;
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}
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kmem_free(bmap);
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return error;
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}
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/* Abort all pending BUIs. */
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STATIC void
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xfs_bmap_update_abort_intent(
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void *intent)
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{
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xfs_bui_release(intent);
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}
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/* Cancel a deferred rmap update. */
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STATIC void
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xfs_bmap_update_cancel_item(
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struct list_head *item)
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{
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struct xfs_bmap_intent *bmap;
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bmap = container_of(item, struct xfs_bmap_intent, bi_list);
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kmem_free(bmap);
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}
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static const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
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.type = XFS_DEFER_OPS_TYPE_BMAP,
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.max_items = XFS_BUI_MAX_FAST_EXTENTS,
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.diff_items = xfs_bmap_update_diff_items,
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.create_intent = xfs_bmap_update_create_intent,
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.abort_intent = xfs_bmap_update_abort_intent,
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.log_item = xfs_bmap_update_log_item,
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.create_done = xfs_bmap_update_create_done,
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.finish_item = xfs_bmap_update_finish_item,
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.cancel_item = xfs_bmap_update_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_bmap_update_init_defer_op(void)
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{
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xfs_defer_init_op_type(&xfs_bmap_update_defer_type);
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}
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