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Linux/fs/nilfs2/direct.c

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  1 /*
  2  * direct.c - NILFS direct block pointer.
  3  *
  4  * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will 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 to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 19  *
 20  * Written by Koji Sato <koji@osrg.net>.
 21  */
 22 
 23 #include <linux/errno.h>
 24 #include "nilfs.h"
 25 #include "page.h"
 26 #include "direct.h"
 27 #include "alloc.h"
 28 #include "dat.h"
 29 
 30 static inline __le64 *nilfs_direct_dptrs(const struct nilfs_bmap *direct)
 31 {
 32         return (__le64 *)
 33                 ((struct nilfs_direct_node *)direct->b_u.u_data + 1);
 34 }
 35 
 36 static inline __u64
 37 nilfs_direct_get_ptr(const struct nilfs_bmap *direct, __u64 key)
 38 {
 39         return le64_to_cpu(*(nilfs_direct_dptrs(direct) + key));
 40 }
 41 
 42 static inline void nilfs_direct_set_ptr(struct nilfs_bmap *direct,
 43                                         __u64 key, __u64 ptr)
 44 {
 45         *(nilfs_direct_dptrs(direct) + key) = cpu_to_le64(ptr);
 46 }
 47 
 48 static int nilfs_direct_lookup(const struct nilfs_bmap *direct,
 49                                __u64 key, int level, __u64 *ptrp)
 50 {
 51         __u64 ptr;
 52 
 53         if (key > NILFS_DIRECT_KEY_MAX || level != 1)
 54                 return -ENOENT;
 55         ptr = nilfs_direct_get_ptr(direct, key);
 56         if (ptr == NILFS_BMAP_INVALID_PTR)
 57                 return -ENOENT;
 58 
 59         *ptrp = ptr;
 60         return 0;
 61 }
 62 
 63 static int nilfs_direct_lookup_contig(const struct nilfs_bmap *direct,
 64                                       __u64 key, __u64 *ptrp,
 65                                       unsigned maxblocks)
 66 {
 67         struct inode *dat = NULL;
 68         __u64 ptr, ptr2;
 69         sector_t blocknr;
 70         int ret, cnt;
 71 
 72         if (key > NILFS_DIRECT_KEY_MAX)
 73                 return -ENOENT;
 74         ptr = nilfs_direct_get_ptr(direct, key);
 75         if (ptr == NILFS_BMAP_INVALID_PTR)
 76                 return -ENOENT;
 77 
 78         if (NILFS_BMAP_USE_VBN(direct)) {
 79                 dat = nilfs_bmap_get_dat(direct);
 80                 ret = nilfs_dat_translate(dat, ptr, &blocknr);
 81                 if (ret < 0)
 82                         return ret;
 83                 ptr = blocknr;
 84         }
 85 
 86         maxblocks = min_t(unsigned, maxblocks, NILFS_DIRECT_KEY_MAX - key + 1);
 87         for (cnt = 1; cnt < maxblocks &&
 88                      (ptr2 = nilfs_direct_get_ptr(direct, key + cnt)) !=
 89                      NILFS_BMAP_INVALID_PTR;
 90              cnt++) {
 91                 if (dat) {
 92                         ret = nilfs_dat_translate(dat, ptr2, &blocknr);
 93                         if (ret < 0)
 94                                 return ret;
 95                         ptr2 = blocknr;
 96                 }
 97                 if (ptr2 != ptr + cnt)
 98                         break;
 99         }
100         *ptrp = ptr;
101         return cnt;
102 }
103 
104 static __u64
105 nilfs_direct_find_target_v(const struct nilfs_bmap *direct, __u64 key)
106 {
107         __u64 ptr;
108 
109         ptr = nilfs_bmap_find_target_seq(direct, key);
110         if (ptr != NILFS_BMAP_INVALID_PTR)
111                 /* sequential access */
112                 return ptr;
113         else
114                 /* block group */
115                 return nilfs_bmap_find_target_in_group(direct);
116 }
117 
118 static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
119 {
120         union nilfs_bmap_ptr_req req;
121         struct inode *dat = NULL;
122         struct buffer_head *bh;
123         int ret;
124 
125         if (key > NILFS_DIRECT_KEY_MAX)
126                 return -ENOENT;
127         if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR)
128                 return -EEXIST;
129 
130         if (NILFS_BMAP_USE_VBN(bmap)) {
131                 req.bpr_ptr = nilfs_direct_find_target_v(bmap, key);
132                 dat = nilfs_bmap_get_dat(bmap);
133         }
134         ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
135         if (!ret) {
136                 /* ptr must be a pointer to a buffer head. */
137                 bh = (struct buffer_head *)((unsigned long)ptr);
138                 set_buffer_nilfs_volatile(bh);
139 
140                 nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
141                 nilfs_direct_set_ptr(bmap, key, req.bpr_ptr);
142 
143                 if (!nilfs_bmap_dirty(bmap))
144                         nilfs_bmap_set_dirty(bmap);
145 
146                 if (NILFS_BMAP_USE_VBN(bmap))
147                         nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr);
148 
149                 nilfs_inode_add_blocks(bmap->b_inode, 1);
150         }
151         return ret;
152 }
153 
154 static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
155 {
156         union nilfs_bmap_ptr_req req;
157         struct inode *dat;
158         int ret;
159 
160         if (key > NILFS_DIRECT_KEY_MAX ||
161             nilfs_direct_get_ptr(bmap, key) == NILFS_BMAP_INVALID_PTR)
162                 return -ENOENT;
163 
164         dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
165         req.bpr_ptr = nilfs_direct_get_ptr(bmap, key);
166 
167         ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
168         if (!ret) {
169                 nilfs_bmap_commit_end_ptr(bmap, &req, dat);
170                 nilfs_direct_set_ptr(bmap, key, NILFS_BMAP_INVALID_PTR);
171                 nilfs_inode_sub_blocks(bmap->b_inode, 1);
172         }
173         return ret;
174 }
175 
176 static int nilfs_direct_seek_key(const struct nilfs_bmap *direct, __u64 start,
177                                  __u64 *keyp)
178 {
179         __u64 key;
180 
181         for (key = start; key <= NILFS_DIRECT_KEY_MAX; key++) {
182                 if (nilfs_direct_get_ptr(direct, key) !=
183                     NILFS_BMAP_INVALID_PTR) {
184                         *keyp = key;
185                         return 0;
186                 }
187         }
188         return -ENOENT;
189 }
190 
191 static int nilfs_direct_last_key(const struct nilfs_bmap *direct, __u64 *keyp)
192 {
193         __u64 key, lastkey;
194 
195         lastkey = NILFS_DIRECT_KEY_MAX + 1;
196         for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++)
197                 if (nilfs_direct_get_ptr(direct, key) !=
198                     NILFS_BMAP_INVALID_PTR)
199                         lastkey = key;
200 
201         if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
202                 return -ENOENT;
203 
204         *keyp = lastkey;
205 
206         return 0;
207 }
208 
209 static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
210 {
211         return key > NILFS_DIRECT_KEY_MAX;
212 }
213 
214 static int nilfs_direct_gather_data(struct nilfs_bmap *direct,
215                                     __u64 *keys, __u64 *ptrs, int nitems)
216 {
217         __u64 key;
218         __u64 ptr;
219         int n;
220 
221         if (nitems > NILFS_DIRECT_NBLOCKS)
222                 nitems = NILFS_DIRECT_NBLOCKS;
223         n = 0;
224         for (key = 0; key < nitems; key++) {
225                 ptr = nilfs_direct_get_ptr(direct, key);
226                 if (ptr != NILFS_BMAP_INVALID_PTR) {
227                         keys[n] = key;
228                         ptrs[n] = ptr;
229                         n++;
230                 }
231         }
232         return n;
233 }
234 
235 int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
236                                     __u64 key, __u64 *keys, __u64 *ptrs, int n)
237 {
238         __le64 *dptrs;
239         int ret, i, j;
240 
241         /* no need to allocate any resource for conversion */
242 
243         /* delete */
244         ret = bmap->b_ops->bop_delete(bmap, key);
245         if (ret < 0)
246                 return ret;
247 
248         /* free resources */
249         if (bmap->b_ops->bop_clear != NULL)
250                 bmap->b_ops->bop_clear(bmap);
251 
252         /* convert */
253         dptrs = nilfs_direct_dptrs(bmap);
254         for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
255                 if ((j < n) && (i == keys[j])) {
256                         dptrs[i] = (i != key) ?
257                                 cpu_to_le64(ptrs[j]) :
258                                 NILFS_BMAP_INVALID_PTR;
259                         j++;
260                 } else
261                         dptrs[i] = NILFS_BMAP_INVALID_PTR;
262         }
263 
264         nilfs_direct_init(bmap);
265         return 0;
266 }
267 
268 static int nilfs_direct_propagate(struct nilfs_bmap *bmap,
269                                   struct buffer_head *bh)
270 {
271         struct nilfs_palloc_req oldreq, newreq;
272         struct inode *dat;
273         __u64 key;
274         __u64 ptr;
275         int ret;
276 
277         if (!NILFS_BMAP_USE_VBN(bmap))
278                 return 0;
279 
280         dat = nilfs_bmap_get_dat(bmap);
281         key = nilfs_bmap_data_get_key(bmap, bh);
282         ptr = nilfs_direct_get_ptr(bmap, key);
283         if (!buffer_nilfs_volatile(bh)) {
284                 oldreq.pr_entry_nr = ptr;
285                 newreq.pr_entry_nr = ptr;
286                 ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
287                 if (ret < 0)
288                         return ret;
289                 nilfs_dat_commit_update(dat, &oldreq, &newreq,
290                                         bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
291                 set_buffer_nilfs_volatile(bh);
292                 nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr);
293         } else
294                 ret = nilfs_dat_mark_dirty(dat, ptr);
295 
296         return ret;
297 }
298 
299 static int nilfs_direct_assign_v(struct nilfs_bmap *direct,
300                                  __u64 key, __u64 ptr,
301                                  struct buffer_head **bh,
302                                  sector_t blocknr,
303                                  union nilfs_binfo *binfo)
304 {
305         struct inode *dat = nilfs_bmap_get_dat(direct);
306         union nilfs_bmap_ptr_req req;
307         int ret;
308 
309         req.bpr_ptr = ptr;
310         ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
311         if (!ret) {
312                 nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
313                 binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
314                 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
315         }
316         return ret;
317 }
318 
319 static int nilfs_direct_assign_p(struct nilfs_bmap *direct,
320                                  __u64 key, __u64 ptr,
321                                  struct buffer_head **bh,
322                                  sector_t blocknr,
323                                  union nilfs_binfo *binfo)
324 {
325         nilfs_direct_set_ptr(direct, key, blocknr);
326 
327         binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
328         binfo->bi_dat.bi_level = 0;
329 
330         return 0;
331 }
332 
333 static int nilfs_direct_assign(struct nilfs_bmap *bmap,
334                                struct buffer_head **bh,
335                                sector_t blocknr,
336                                union nilfs_binfo *binfo)
337 {
338         __u64 key;
339         __u64 ptr;
340 
341         key = nilfs_bmap_data_get_key(bmap, *bh);
342         if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
343                 printk(KERN_CRIT "%s: invalid key: %llu\n", __func__,
344                        (unsigned long long)key);
345                 return -EINVAL;
346         }
347         ptr = nilfs_direct_get_ptr(bmap, key);
348         if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
349                 printk(KERN_CRIT "%s: invalid pointer: %llu\n", __func__,
350                        (unsigned long long)ptr);
351                 return -EINVAL;
352         }
353 
354         return NILFS_BMAP_USE_VBN(bmap) ?
355                 nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) :
356                 nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo);
357 }
358 
359 static const struct nilfs_bmap_operations nilfs_direct_ops = {
360         .bop_lookup             =       nilfs_direct_lookup,
361         .bop_lookup_contig      =       nilfs_direct_lookup_contig,
362         .bop_insert             =       nilfs_direct_insert,
363         .bop_delete             =       nilfs_direct_delete,
364         .bop_clear              =       NULL,
365 
366         .bop_propagate          =       nilfs_direct_propagate,
367 
368         .bop_lookup_dirty_buffers       =       NULL,
369 
370         .bop_assign             =       nilfs_direct_assign,
371         .bop_mark               =       NULL,
372 
373         .bop_seek_key           =       nilfs_direct_seek_key,
374         .bop_last_key           =       nilfs_direct_last_key,
375 
376         .bop_check_insert       =       nilfs_direct_check_insert,
377         .bop_check_delete       =       NULL,
378         .bop_gather_data        =       nilfs_direct_gather_data,
379 };
380 
381 
382 int nilfs_direct_init(struct nilfs_bmap *bmap)
383 {
384         bmap->b_ops = &nilfs_direct_ops;
385         return 0;
386 }
387 

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