fs/xfs/xfs_trans_bmap.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_defer.h"
  14 #include "xfs_trans.h"
  15 #include "xfs_trans_priv.h"
  16 #include "xfs_bmap_item.h"
  17 #include "xfs_alloc.h"
  18 #include "xfs_bmap.h"
  19 #include "xfs_inode.h"
  20
  21 /*
  22  * This routine is called to allocate a "bmap update done"
  23  * log item.
  24  */
  25 struct xfs_bud_log_item *
  26 xfs_trans_get_bud(
  27         struct xfs_trans                *tp,
  28         struct xfs_bui_log_item         *buip)
  29 {
  30         struct xfs_bud_log_item         *budp;
  31
  32         budp = xfs_bud_init(tp->t_mountp, buip);
  33         xfs_trans_add_item(tp, &budp->bud_item);
  34         return budp;
  35 }
  36
  37 /*
  38  * Finish an bmap update and log it to the BUD. Note that the
  39  * transaction is marked dirty regardless of whether the bmap update
  40  * succeeds or fails to support the BUI/BUD lifecycle rules.
  41  */
  42 int
  43 xfs_trans_log_finish_bmap_update(
  44         struct xfs_trans                *tp,
  45         struct xfs_bud_log_item         *budp,
  46         enum xfs_bmap_intent_type       type,
  47         struct xfs_inode                *ip,
  48         int                             whichfork,
  49         xfs_fileoff_t                   startoff,
  50         xfs_fsblock_t                   startblock,
  51         xfs_filblks_t                   *blockcount,
  52         xfs_exntst_t                    state)
  53 {
  54         int                             error;
  55
  56         error = xfs_bmap_finish_one(tp, ip, type, whichfork, startoff,
  57                         startblock, blockcount, state);
  58
  59         /*
  60          * Mark the transaction dirty, even on error. This ensures the
  61          * transaction is aborted, which:
  62          *
  63          * 1.) releases the BUI and frees the BUD
  64          * 2.) shuts down the filesystem
  65          */
  66         tp->t_flags |= XFS_TRANS_DIRTY;
  67         set_bit(XFS_LI_DIRTY, &budp->bud_item.li_flags);
  68
  69         return error;
  70 }
  71
  72 /* Sort bmap intents by inode. */
  73 static int
  74 xfs_bmap_update_diff_items(
  75         void                            *priv,
  76         struct list_head                *a,
  77         struct list_head                *b)
  78 {
  79         struct xfs_bmap_intent          *ba;
  80         struct xfs_bmap_intent          *bb;
  81
  82         ba = container_of(a, struct xfs_bmap_intent, bi_list);
  83         bb = container_of(b, struct xfs_bmap_intent, bi_list);
  84         return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
  85 }
  86
  87 /* Get an BUI. */
  88 STATIC void *
  89 xfs_bmap_update_create_intent(
  90         struct xfs_trans                *tp,
  91         unsigned int                    count)
  92 {
  93         struct xfs_bui_log_item         *buip;
  94
  95         ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);
  96         ASSERT(tp != NULL);
  97
  98         buip = xfs_bui_init(tp->t_mountp);
  99         ASSERT(buip != NULL);
 100
 101         /*
 102          * Get a log_item_desc to point at the new item.
 103          */
 104         xfs_trans_add_item(tp, &buip->bui_item);
 105         return buip;
 106 }
 107
 108 /* Set the map extent flags for this mapping. */
 109 static void
 110 xfs_trans_set_bmap_flags(
 111         struct xfs_map_extent           *bmap,
 112         enum xfs_bmap_intent_type       type,
 113         int                             whichfork,
 114         xfs_exntst_t                    state)
 115 {
 116         bmap->me_flags = 0;
 117         switch (type) {
 118         case XFS_BMAP_MAP:
 119         case XFS_BMAP_UNMAP:
 120                 bmap->me_flags = type;
 121                 break;
 122         default:
 123                 ASSERT(0);
 124         }
 125         if (state == XFS_EXT_UNWRITTEN)
 126                 bmap->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN;
 127         if (whichfork == XFS_ATTR_FORK)
 128                 bmap->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK;
 129 }
 130
 131 /* Log bmap updates in the intent item. */
 132 STATIC void
 133 xfs_bmap_update_log_item(
 134         struct xfs_trans                *tp,
 135         void                            *intent,
 136         struct list_head                *item)
 137 {
 138         struct xfs_bui_log_item         *buip = intent;
 139         struct xfs_bmap_intent          *bmap;
 140         uint                            next_extent;
 141         struct xfs_map_extent           *map;
 142
 143         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
 144
 145         tp->t_flags |= XFS_TRANS_DIRTY;
 146         set_bit(XFS_LI_DIRTY, &buip->bui_item.li_flags);
 147
 148         /*
 149          * atomic_inc_return gives us the value after the increment;
 150          * we want to use it as an array index so we need to subtract 1 from
 151          * it.
 152          */
 153         next_extent = atomic_inc_return(&buip->bui_next_extent) - 1;
 154         ASSERT(next_extent < buip->bui_format.bui_nextents);
 155         map = &buip->bui_format.bui_extents[next_extent];
 156         map->me_owner = bmap->bi_owner->i_ino;
 157         map->me_startblock = bmap->bi_bmap.br_startblock;
 158         map->me_startoff = bmap->bi_bmap.br_startoff;
 159         map->me_len = bmap->bi_bmap.br_blockcount;
 160         xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork,
 161                         bmap->bi_bmap.br_state);
 162 }
 163
 164 /* Get an BUD so we can process all the deferred rmap updates. */
 165 STATIC void *
 166 xfs_bmap_update_create_done(
 167         struct xfs_trans                *tp,
 168         void                            *intent,
 169         unsigned int                    count)
 170 {
 171         return xfs_trans_get_bud(tp, intent);
 172 }
 173
 174 /* Process a deferred rmap update. */
 175 STATIC int
 176 xfs_bmap_update_finish_item(
 177         struct xfs_trans                *tp,
 178         struct list_head                *item,
 179         void                            *done_item,
 180         void                            **state)
 181 {
 182         struct xfs_bmap_intent          *bmap;
 183         xfs_filblks_t                   count;
 184         int                             error;
 185
 186         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
 187         count = bmap->bi_bmap.br_blockcount;
 188         error = xfs_trans_log_finish_bmap_update(tp, done_item,
 189                         bmap->bi_type,
 190                         bmap->bi_owner, bmap->bi_whichfork,
 191                         bmap->bi_bmap.br_startoff,
 192                         bmap->bi_bmap.br_startblock,
 193                         &count,
 194                         bmap->bi_bmap.br_state);
 195         if (!error && count > 0) {
 196                 ASSERT(bmap->bi_type == XFS_BMAP_UNMAP);
 197                 bmap->bi_bmap.br_blockcount = count;
 198                 return -EAGAIN;
 199         }
 200         kmem_free(bmap);
 201         return error;
 202 }
 203
 204 /* Abort all pending BUIs. */
 205 STATIC void
 206 xfs_bmap_update_abort_intent(
 207         void                            *intent)
 208 {
 209         xfs_bui_release(intent);
 210 }
 211
 212 /* Cancel a deferred rmap update. */
 213 STATIC void
 214 xfs_bmap_update_cancel_item(
 215         struct list_head                *item)
 216 {
 217         struct xfs_bmap_intent          *bmap;
 218
 219         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
 220         kmem_free(bmap);
 221 }
 222
 223 const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
 224         .max_items      = XFS_BUI_MAX_FAST_EXTENTS,
 225         .diff_items     = xfs_bmap_update_diff_items,
 226         .create_intent  = xfs_bmap_update_create_intent,
 227         .abort_intent   = xfs_bmap_update_abort_intent,
 228         .log_item       = xfs_bmap_update_log_item,
 229         .create_done    = xfs_bmap_update_create_done,
 230         .finish_item    = xfs_bmap_update_finish_item,
 231         .cancel_item    = xfs_bmap_update_cancel_item,
 232 };