fs/xfs/xfs_trans_rmap.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_rmap_item.h"
  17 #include "xfs_alloc.h"
  18 #include "xfs_rmap.h"
  19
  20 /* Set the map extent flags for this reverse mapping. */
  21 static void
  22 xfs_trans_set_rmap_flags(
  23         struct xfs_map_extent           *rmap,
  24         enum xfs_rmap_intent_type       type,
  25         int                             whichfork,
  26         xfs_exntst_t                    state)
  27 {
  28         rmap->me_flags = 0;
  29         if (state == XFS_EXT_UNWRITTEN)
  30                 rmap->me_flags |= XFS_RMAP_EXTENT_UNWRITTEN;
  31         if (whichfork == XFS_ATTR_FORK)
  32                 rmap->me_flags |= XFS_RMAP_EXTENT_ATTR_FORK;
  33         switch (type) {
  34         case XFS_RMAP_MAP:
  35                 rmap->me_flags |= XFS_RMAP_EXTENT_MAP;
  36                 break;
  37         case XFS_RMAP_MAP_SHARED:
  38                 rmap->me_flags |= XFS_RMAP_EXTENT_MAP_SHARED;
  39                 break;
  40         case XFS_RMAP_UNMAP:
  41                 rmap->me_flags |= XFS_RMAP_EXTENT_UNMAP;
  42                 break;
  43         case XFS_RMAP_UNMAP_SHARED:
  44                 rmap->me_flags |= XFS_RMAP_EXTENT_UNMAP_SHARED;
  45                 break;
  46         case XFS_RMAP_CONVERT:
  47                 rmap->me_flags |= XFS_RMAP_EXTENT_CONVERT;
  48                 break;
  49         case XFS_RMAP_CONVERT_SHARED:
  50                 rmap->me_flags |= XFS_RMAP_EXTENT_CONVERT_SHARED;
  51                 break;
  52         case XFS_RMAP_ALLOC:
  53                 rmap->me_flags |= XFS_RMAP_EXTENT_ALLOC;
  54                 break;
  55         case XFS_RMAP_FREE:
  56                 rmap->me_flags |= XFS_RMAP_EXTENT_FREE;
  57                 break;
  58         default:
  59                 ASSERT(0);
  60         }
  61 }
  62
  63 struct xfs_rud_log_item *
  64 xfs_trans_get_rud(
  65         struct xfs_trans                *tp,
  66         struct xfs_rui_log_item         *ruip)
  67 {
  68         struct xfs_rud_log_item         *rudp;
  69
  70         rudp = xfs_rud_init(tp->t_mountp, ruip);
  71         xfs_trans_add_item(tp, &rudp->rud_item);
  72         return rudp;
  73 }
  74
  75 /*
  76  * Finish an rmap update and log it to the RUD. Note that the transaction is
  77  * marked dirty regardless of whether the rmap update succeeds or fails to
  78  * support the RUI/RUD lifecycle rules.
  79  */
  80 int
  81 xfs_trans_log_finish_rmap_update(
  82         struct xfs_trans                *tp,
  83         struct xfs_rud_log_item         *rudp,
  84         enum xfs_rmap_intent_type       type,
  85         uint64_t                        owner,
  86         int                             whichfork,
  87         xfs_fileoff_t                   startoff,
  88         xfs_fsblock_t                   startblock,
  89         xfs_filblks_t                   blockcount,
  90         xfs_exntst_t                    state,
  91         struct xfs_btree_cur            **pcur)
  92 {
  93         int                             error;
  94
  95         error = xfs_rmap_finish_one(tp, type, owner, whichfork, startoff,
  96                         startblock, blockcount, state, pcur);
  97
  98         /*
  99          * Mark the transaction dirty, even on error. This ensures the
 100          * transaction is aborted, which:
 101          *
 102          * 1.) releases the RUI and frees the RUD
 103          * 2.) shuts down the filesystem
 104          */
 105         tp->t_flags |= XFS_TRANS_DIRTY;
 106         set_bit(XFS_LI_DIRTY, &rudp->rud_item.li_flags);
 107
 108         return error;
 109 }
 110
 111 /* Sort rmap intents by AG. */
 112 static int
 113 xfs_rmap_update_diff_items(
 114         void                            *priv,
 115         struct list_head                *a,
 116         struct list_head                *b)
 117 {
 118         struct xfs_mount                *mp = priv;
 119         struct xfs_rmap_intent          *ra;
 120         struct xfs_rmap_intent          *rb;
 121
 122         ra = container_of(a, struct xfs_rmap_intent, ri_list);
 123         rb = container_of(b, struct xfs_rmap_intent, ri_list);
 124         return  XFS_FSB_TO_AGNO(mp, ra->ri_bmap.br_startblock) -
 125                 XFS_FSB_TO_AGNO(mp, rb->ri_bmap.br_startblock);
 126 }
 127
 128 /* Get an RUI. */
 129 STATIC void *
 130 xfs_rmap_update_create_intent(
 131         struct xfs_trans                *tp,
 132         unsigned int                    count)
 133 {
 134         struct xfs_rui_log_item         *ruip;
 135
 136         ASSERT(tp != NULL);
 137         ASSERT(count > 0);
 138
 139         ruip = xfs_rui_init(tp->t_mountp, count);
 140         ASSERT(ruip != NULL);
 141
 142         /*
 143          * Get a log_item_desc to point at the new item.
 144          */
 145         xfs_trans_add_item(tp, &ruip->rui_item);
 146         return ruip;
 147 }
 148
 149 /* Log rmap updates in the intent item. */
 150 STATIC void
 151 xfs_rmap_update_log_item(
 152         struct xfs_trans                *tp,
 153         void                            *intent,
 154         struct list_head                *item)
 155 {
 156         struct xfs_rui_log_item         *ruip = intent;
 157         struct xfs_rmap_intent          *rmap;
 158         uint                            next_extent;
 159         struct xfs_map_extent           *map;
 160
 161         rmap = container_of(item, struct xfs_rmap_intent, ri_list);
 162
 163         tp->t_flags |= XFS_TRANS_DIRTY;
 164         set_bit(XFS_LI_DIRTY, &ruip->rui_item.li_flags);
 165
 166         /*
 167          * atomic_inc_return gives us the value after the increment;
 168          * we want to use it as an array index so we need to subtract 1 from
 169          * it.
 170          */
 171         next_extent = atomic_inc_return(&ruip->rui_next_extent) - 1;
 172         ASSERT(next_extent < ruip->rui_format.rui_nextents);
 173         map = &ruip->rui_format.rui_extents[next_extent];
 174         map->me_owner = rmap->ri_owner;
 175         map->me_startblock = rmap->ri_bmap.br_startblock;
 176         map->me_startoff = rmap->ri_bmap.br_startoff;
 177         map->me_len = rmap->ri_bmap.br_blockcount;
 178         xfs_trans_set_rmap_flags(map, rmap->ri_type, rmap->ri_whichfork,
 179                         rmap->ri_bmap.br_state);
 180 }
 181
 182 /* Get an RUD so we can process all the deferred rmap updates. */
 183 STATIC void *
 184 xfs_rmap_update_create_done(
 185         struct xfs_trans                *tp,
 186         void                            *intent,
 187         unsigned int                    count)
 188 {
 189         return xfs_trans_get_rud(tp, intent);
 190 }
 191
 192 /* Process a deferred rmap update. */
 193 STATIC int
 194 xfs_rmap_update_finish_item(
 195         struct xfs_trans                *tp,
 196         struct list_head                *item,
 197         void                            *done_item,
 198         void                            **state)
 199 {
 200         struct xfs_rmap_intent          *rmap;
 201         int                             error;
 202
 203         rmap = container_of(item, struct xfs_rmap_intent, ri_list);
 204         error = xfs_trans_log_finish_rmap_update(tp, done_item,
 205                         rmap->ri_type,
 206                         rmap->ri_owner, rmap->ri_whichfork,
 207                         rmap->ri_bmap.br_startoff,
 208                         rmap->ri_bmap.br_startblock,
 209                         rmap->ri_bmap.br_blockcount,
 210                         rmap->ri_bmap.br_state,
 211                         (struct xfs_btree_cur **)state);
 212         kmem_free(rmap);
 213         return error;
 214 }
 215
 216 /* Clean up after processing deferred rmaps. */
 217 STATIC void
 218 xfs_rmap_update_finish_cleanup(
 219         struct xfs_trans        *tp,
 220         void                    *state,
 221         int                     error)
 222 {
 223         struct xfs_btree_cur    *rcur = state;
 224
 225         xfs_rmap_finish_one_cleanup(tp, rcur, error);
 226 }
 227
 228 /* Abort all pending RUIs. */
 229 STATIC void
 230 xfs_rmap_update_abort_intent(
 231         void                            *intent)
 232 {
 233         xfs_rui_release(intent);
 234 }
 235
 236 /* Cancel a deferred rmap update. */
 237 STATIC void
 238 xfs_rmap_update_cancel_item(
 239         struct list_head                *item)
 240 {
 241         struct xfs_rmap_intent          *rmap;
 242
 243         rmap = container_of(item, struct xfs_rmap_intent, ri_list);
 244         kmem_free(rmap);
 245 }
 246
 247 static const struct xfs_defer_op_type xfs_rmap_update_defer_type = {
 248         .type           = XFS_DEFER_OPS_TYPE_RMAP,
 249         .max_items      = XFS_RUI_MAX_FAST_EXTENTS,
 250         .diff_items     = xfs_rmap_update_diff_items,
 251         .create_intent  = xfs_rmap_update_create_intent,
 252         .abort_intent   = xfs_rmap_update_abort_intent,
 253         .log_item       = xfs_rmap_update_log_item,
 254         .create_done    = xfs_rmap_update_create_done,
 255         .finish_item    = xfs_rmap_update_finish_item,
 256         .finish_cleanup = xfs_rmap_update_finish_cleanup,
 257         .cancel_item    = xfs_rmap_update_cancel_item,
 258 };
 259
 260 /* Register the deferred op type. */
 261 void
 262 xfs_rmap_update_init_defer_op(void)
 263 {
 264         xfs_defer_init_op_type(&xfs_rmap_update_defer_type);
 265 }