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TOMOYO Linux Cross Reference
Linux/fs/xfs/xfs_trans_bmap.c

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  1 /*
  2  * Copyright (C) 2016 Oracle.  All Rights Reserved.
  3  *
  4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version 2
  9  * of the License, or (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it would be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write the Free Software Foundation,
 18  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 19  */
 20 #include "xfs.h"
 21 #include "xfs_fs.h"
 22 #include "xfs_shared.h"
 23 #include "xfs_format.h"
 24 #include "xfs_log_format.h"
 25 #include "xfs_trans_resv.h"
 26 #include "xfs_mount.h"
 27 #include "xfs_defer.h"
 28 #include "xfs_trans.h"
 29 #include "xfs_trans_priv.h"
 30 #include "xfs_bmap_item.h"
 31 #include "xfs_alloc.h"
 32 #include "xfs_bmap.h"
 33 #include "xfs_inode.h"
 34 
 35 /*
 36  * This routine is called to allocate a "bmap update done"
 37  * log item.
 38  */
 39 struct xfs_bud_log_item *
 40 xfs_trans_get_bud(
 41         struct xfs_trans                *tp,
 42         struct xfs_bui_log_item         *buip)
 43 {
 44         struct xfs_bud_log_item         *budp;
 45 
 46         budp = xfs_bud_init(tp->t_mountp, buip);
 47         xfs_trans_add_item(tp, &budp->bud_item);
 48         return budp;
 49 }
 50 
 51 /*
 52  * Finish an bmap update and log it to the BUD. Note that the
 53  * transaction is marked dirty regardless of whether the bmap update
 54  * succeeds or fails to support the BUI/BUD lifecycle rules.
 55  */
 56 int
 57 xfs_trans_log_finish_bmap_update(
 58         struct xfs_trans                *tp,
 59         struct xfs_bud_log_item         *budp,
 60         struct xfs_defer_ops            *dop,
 61         enum xfs_bmap_intent_type       type,
 62         struct xfs_inode                *ip,
 63         int                             whichfork,
 64         xfs_fileoff_t                   startoff,
 65         xfs_fsblock_t                   startblock,
 66         xfs_filblks_t                   blockcount,
 67         xfs_exntst_t                    state)
 68 {
 69         int                             error;
 70 
 71         error = xfs_bmap_finish_one(tp, dop, ip, type, whichfork, startoff,
 72                         startblock, blockcount, state);
 73 
 74         /*
 75          * Mark the transaction dirty, even on error. This ensures the
 76          * transaction is aborted, which:
 77          *
 78          * 1.) releases the BUI and frees the BUD
 79          * 2.) shuts down the filesystem
 80          */
 81         tp->t_flags |= XFS_TRANS_DIRTY;
 82         budp->bud_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 83 
 84         return error;
 85 }
 86 
 87 /* Sort bmap intents by inode. */
 88 static int
 89 xfs_bmap_update_diff_items(
 90         void                            *priv,
 91         struct list_head                *a,
 92         struct list_head                *b)
 93 {
 94         struct xfs_bmap_intent          *ba;
 95         struct xfs_bmap_intent          *bb;
 96 
 97         ba = container_of(a, struct xfs_bmap_intent, bi_list);
 98         bb = container_of(b, struct xfs_bmap_intent, bi_list);
 99         return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
100 }
101 
102 /* Get an BUI. */
103 STATIC void *
104 xfs_bmap_update_create_intent(
105         struct xfs_trans                *tp,
106         unsigned int                    count)
107 {
108         struct xfs_bui_log_item         *buip;
109 
110         ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);
111         ASSERT(tp != NULL);
112 
113         buip = xfs_bui_init(tp->t_mountp);
114         ASSERT(buip != NULL);
115 
116         /*
117          * Get a log_item_desc to point at the new item.
118          */
119         xfs_trans_add_item(tp, &buip->bui_item);
120         return buip;
121 }
122 
123 /* Set the map extent flags for this mapping. */
124 static void
125 xfs_trans_set_bmap_flags(
126         struct xfs_map_extent           *bmap,
127         enum xfs_bmap_intent_type       type,
128         int                             whichfork,
129         xfs_exntst_t                    state)
130 {
131         bmap->me_flags = 0;
132         switch (type) {
133         case XFS_BMAP_MAP:
134         case XFS_BMAP_UNMAP:
135                 bmap->me_flags = type;
136                 break;
137         default:
138                 ASSERT(0);
139         }
140         if (state == XFS_EXT_UNWRITTEN)
141                 bmap->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN;
142         if (whichfork == XFS_ATTR_FORK)
143                 bmap->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK;
144 }
145 
146 /* Log bmap updates in the intent item. */
147 STATIC void
148 xfs_bmap_update_log_item(
149         struct xfs_trans                *tp,
150         void                            *intent,
151         struct list_head                *item)
152 {
153         struct xfs_bui_log_item         *buip = intent;
154         struct xfs_bmap_intent          *bmap;
155         uint                            next_extent;
156         struct xfs_map_extent           *map;
157 
158         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
159 
160         tp->t_flags |= XFS_TRANS_DIRTY;
161         buip->bui_item.li_desc->lid_flags |= XFS_LID_DIRTY;
162 
163         /*
164          * atomic_inc_return gives us the value after the increment;
165          * we want to use it as an array index so we need to subtract 1 from
166          * it.
167          */
168         next_extent = atomic_inc_return(&buip->bui_next_extent) - 1;
169         ASSERT(next_extent < buip->bui_format.bui_nextents);
170         map = &buip->bui_format.bui_extents[next_extent];
171         map->me_owner = bmap->bi_owner->i_ino;
172         map->me_startblock = bmap->bi_bmap.br_startblock;
173         map->me_startoff = bmap->bi_bmap.br_startoff;
174         map->me_len = bmap->bi_bmap.br_blockcount;
175         xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork,
176                         bmap->bi_bmap.br_state);
177 }
178 
179 /* Get an BUD so we can process all the deferred rmap updates. */
180 STATIC void *
181 xfs_bmap_update_create_done(
182         struct xfs_trans                *tp,
183         void                            *intent,
184         unsigned int                    count)
185 {
186         return xfs_trans_get_bud(tp, intent);
187 }
188 
189 /* Process a deferred rmap update. */
190 STATIC int
191 xfs_bmap_update_finish_item(
192         struct xfs_trans                *tp,
193         struct xfs_defer_ops            *dop,
194         struct list_head                *item,
195         void                            *done_item,
196         void                            **state)
197 {
198         struct xfs_bmap_intent          *bmap;
199         int                             error;
200 
201         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
202         error = xfs_trans_log_finish_bmap_update(tp, done_item, dop,
203                         bmap->bi_type,
204                         bmap->bi_owner, bmap->bi_whichfork,
205                         bmap->bi_bmap.br_startoff,
206                         bmap->bi_bmap.br_startblock,
207                         bmap->bi_bmap.br_blockcount,
208                         bmap->bi_bmap.br_state);
209         kmem_free(bmap);
210         return error;
211 }
212 
213 /* Abort all pending BUIs. */
214 STATIC void
215 xfs_bmap_update_abort_intent(
216         void                            *intent)
217 {
218         xfs_bui_release(intent);
219 }
220 
221 /* Cancel a deferred rmap update. */
222 STATIC void
223 xfs_bmap_update_cancel_item(
224         struct list_head                *item)
225 {
226         struct xfs_bmap_intent          *bmap;
227 
228         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
229         kmem_free(bmap);
230 }
231 
232 static const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
233         .type           = XFS_DEFER_OPS_TYPE_BMAP,
234         .max_items      = XFS_BUI_MAX_FAST_EXTENTS,
235         .diff_items     = xfs_bmap_update_diff_items,
236         .create_intent  = xfs_bmap_update_create_intent,
237         .abort_intent   = xfs_bmap_update_abort_intent,
238         .log_item       = xfs_bmap_update_log_item,
239         .create_done    = xfs_bmap_update_create_done,
240         .finish_item    = xfs_bmap_update_finish_item,
241         .cancel_item    = xfs_bmap_update_cancel_item,
242 };
243 
244 /* Register the deferred op type. */
245 void
246 xfs_bmap_update_init_defer_op(void)
247 {
248         xfs_defer_init_op_type(&xfs_bmap_update_defer_type);
249 }
250 

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