2 * direct.c - NILFS direct block pointer.
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
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
20 * Written by Koji Sato <koji@osrg.net>.
23 #include <linux/errno.h>
29 static inline __le64 *nilfs_direct_dptrs(const struct nilfs_direct *direct)
32 ((struct nilfs_direct_node *)direct->d_bmap.b_u.u_data + 1);
36 nilfs_direct_get_ptr(const struct nilfs_direct *direct, __u64 key)
38 return nilfs_bmap_dptr_to_ptr(*(nilfs_direct_dptrs(direct) + key));
41 static inline void nilfs_direct_set_ptr(struct nilfs_direct *direct,
44 *(nilfs_direct_dptrs(direct) + key) = nilfs_bmap_ptr_to_dptr(ptr);
47 static int nilfs_direct_lookup(const struct nilfs_bmap *bmap,
48 __u64 key, int level, __u64 *ptrp)
50 struct nilfs_direct *direct;
53 direct = (struct nilfs_direct *)bmap;
54 if ((key > NILFS_DIRECT_KEY_MAX) ||
55 (level != 1) || /* XXX: use macro for level 1 */
56 ((ptr = nilfs_direct_get_ptr(direct, key)) ==
57 NILFS_BMAP_INVALID_PTR))
66 nilfs_direct_find_target_v(const struct nilfs_direct *direct, __u64 key)
70 ptr = nilfs_bmap_find_target_seq(&direct->d_bmap, key);
71 if (ptr != NILFS_BMAP_INVALID_PTR)
72 /* sequential access */
76 return nilfs_bmap_find_target_in_group(&direct->d_bmap);
79 static void nilfs_direct_set_target_v(struct nilfs_direct *direct,
82 direct->d_bmap.b_last_allocated_key = key;
83 direct->d_bmap.b_last_allocated_ptr = ptr;
86 static int nilfs_direct_prepare_insert(struct nilfs_direct *direct,
88 union nilfs_bmap_ptr_req *req,
89 struct nilfs_bmap_stats *stats)
93 if (NILFS_BMAP_USE_VBN(&direct->d_bmap))
94 req->bpr_ptr = nilfs_direct_find_target_v(direct, key);
95 ret = nilfs_bmap_prepare_alloc_ptr(&direct->d_bmap, req);
99 stats->bs_nblocks = 1;
103 static void nilfs_direct_commit_insert(struct nilfs_direct *direct,
104 union nilfs_bmap_ptr_req *req,
105 __u64 key, __u64 ptr)
107 struct buffer_head *bh;
109 /* ptr must be a pointer to a buffer head. */
110 bh = (struct buffer_head *)((unsigned long)ptr);
111 set_buffer_nilfs_volatile(bh);
113 nilfs_bmap_commit_alloc_ptr(&direct->d_bmap, req);
114 nilfs_direct_set_ptr(direct, key, req->bpr_ptr);
116 if (!nilfs_bmap_dirty(&direct->d_bmap))
117 nilfs_bmap_set_dirty(&direct->d_bmap);
119 if (NILFS_BMAP_USE_VBN(&direct->d_bmap))
120 nilfs_direct_set_target_v(direct, key, req->bpr_ptr);
123 static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
125 struct nilfs_direct *direct;
126 union nilfs_bmap_ptr_req req;
127 struct nilfs_bmap_stats stats;
130 direct = (struct nilfs_direct *)bmap;
131 if (key > NILFS_DIRECT_KEY_MAX)
133 if (nilfs_direct_get_ptr(direct, key) != NILFS_BMAP_INVALID_PTR)
136 ret = nilfs_direct_prepare_insert(direct, key, &req, &stats);
139 nilfs_direct_commit_insert(direct, &req, key, ptr);
140 nilfs_bmap_add_blocks(bmap, stats.bs_nblocks);
145 static int nilfs_direct_prepare_delete(struct nilfs_direct *direct,
146 union nilfs_bmap_ptr_req *req,
148 struct nilfs_bmap_stats *stats)
152 req->bpr_ptr = nilfs_direct_get_ptr(direct, key);
153 ret = nilfs_bmap_prepare_end_ptr(&direct->d_bmap, req);
155 stats->bs_nblocks = 1;
159 static void nilfs_direct_commit_delete(struct nilfs_direct *direct,
160 union nilfs_bmap_ptr_req *req,
163 nilfs_bmap_commit_end_ptr(&direct->d_bmap, req);
164 nilfs_direct_set_ptr(direct, key, NILFS_BMAP_INVALID_PTR);
167 static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
169 struct nilfs_direct *direct;
170 union nilfs_bmap_ptr_req req;
171 struct nilfs_bmap_stats stats;
174 direct = (struct nilfs_direct *)bmap;
175 if ((key > NILFS_DIRECT_KEY_MAX) ||
176 nilfs_direct_get_ptr(direct, key) == NILFS_BMAP_INVALID_PTR)
179 ret = nilfs_direct_prepare_delete(direct, &req, key, &stats);
182 nilfs_direct_commit_delete(direct, &req, key);
183 nilfs_bmap_sub_blocks(bmap, stats.bs_nblocks);
188 static int nilfs_direct_last_key(const struct nilfs_bmap *bmap, __u64 *keyp)
190 struct nilfs_direct *direct;
193 direct = (struct nilfs_direct *)bmap;
194 lastkey = NILFS_DIRECT_KEY_MAX + 1;
195 for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++)
196 if (nilfs_direct_get_ptr(direct, key) !=
197 NILFS_BMAP_INVALID_PTR)
200 if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
208 static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
210 return key > NILFS_DIRECT_KEY_MAX;
213 static int nilfs_direct_gather_data(struct nilfs_bmap *bmap,
214 __u64 *keys, __u64 *ptrs, int nitems)
216 struct nilfs_direct *direct;
221 direct = (struct nilfs_direct *)bmap;
222 if (nitems > NILFS_DIRECT_NBLOCKS)
223 nitems = NILFS_DIRECT_NBLOCKS;
225 for (key = 0; key < nitems; key++) {
226 ptr = nilfs_direct_get_ptr(direct, key);
227 if (ptr != NILFS_BMAP_INVALID_PTR) {
236 int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
237 __u64 key, __u64 *keys, __u64 *ptrs, int n)
239 struct nilfs_direct *direct;
243 /* no need to allocate any resource for conversion */
246 ret = bmap->b_ops->bop_delete(bmap, key);
251 if (bmap->b_ops->bop_clear != NULL)
252 bmap->b_ops->bop_clear(bmap);
255 direct = (struct nilfs_direct *)bmap;
256 dptrs = nilfs_direct_dptrs(direct);
257 for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
258 if ((j < n) && (i == keys[j])) {
259 dptrs[i] = (i != key) ?
260 nilfs_bmap_ptr_to_dptr(ptrs[j]) :
261 NILFS_BMAP_INVALID_PTR;
264 dptrs[i] = NILFS_BMAP_INVALID_PTR;
267 nilfs_direct_init(bmap);
271 static int nilfs_direct_propagate_v(struct nilfs_direct *direct,
272 struct buffer_head *bh)
274 union nilfs_bmap_ptr_req oldreq, newreq;
279 key = nilfs_bmap_data_get_key(&direct->d_bmap, bh);
280 ptr = nilfs_direct_get_ptr(direct, key);
281 if (!buffer_nilfs_volatile(bh)) {
282 oldreq.bpr_ptr = ptr;
283 newreq.bpr_ptr = ptr;
284 ret = nilfs_bmap_prepare_update_v(&direct->d_bmap, &oldreq,
288 nilfs_bmap_commit_update_v(&direct->d_bmap, &oldreq, &newreq);
289 set_buffer_nilfs_volatile(bh);
290 nilfs_direct_set_ptr(direct, key, newreq.bpr_ptr);
292 ret = nilfs_bmap_mark_dirty(&direct->d_bmap, ptr);
297 static int nilfs_direct_propagate(const struct nilfs_bmap *bmap,
298 struct buffer_head *bh)
300 struct nilfs_direct *direct = (struct nilfs_direct *)bmap;
302 return NILFS_BMAP_USE_VBN(bmap) ?
303 nilfs_direct_propagate_v(direct, bh) : 0;
306 static int nilfs_direct_assign_v(struct nilfs_direct *direct,
307 __u64 key, __u64 ptr,
308 struct buffer_head **bh,
310 union nilfs_binfo *binfo)
312 union nilfs_bmap_ptr_req req;
316 ret = nilfs_bmap_start_v(&direct->d_bmap, &req, blocknr);
317 if (unlikely(ret < 0))
320 binfo->bi_v.bi_vblocknr = nilfs_bmap_ptr_to_dptr(ptr);
321 binfo->bi_v.bi_blkoff = nilfs_bmap_key_to_dkey(key);
326 static int nilfs_direct_assign_p(struct nilfs_direct *direct,
327 __u64 key, __u64 ptr,
328 struct buffer_head **bh,
330 union nilfs_binfo *binfo)
332 nilfs_direct_set_ptr(direct, key, blocknr);
334 binfo->bi_dat.bi_blkoff = nilfs_bmap_key_to_dkey(key);
335 binfo->bi_dat.bi_level = 0;
340 static int nilfs_direct_assign(struct nilfs_bmap *bmap,
341 struct buffer_head **bh,
343 union nilfs_binfo *binfo)
345 struct nilfs_direct *direct;
349 direct = (struct nilfs_direct *)bmap;
350 key = nilfs_bmap_data_get_key(bmap, *bh);
351 if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
352 printk(KERN_CRIT "%s: invalid key: %llu\n", __func__,
353 (unsigned long long)key);
356 ptr = nilfs_direct_get_ptr(direct, key);
357 if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
358 printk(KERN_CRIT "%s: invalid pointer: %llu\n", __func__,
359 (unsigned long long)ptr);
363 return NILFS_BMAP_USE_VBN(bmap) ?
364 nilfs_direct_assign_v(direct, key, ptr, bh, blocknr, binfo) :
365 nilfs_direct_assign_p(direct, key, ptr, bh, blocknr, binfo);
368 static const struct nilfs_bmap_operations nilfs_direct_ops = {
369 .bop_lookup = nilfs_direct_lookup,
370 .bop_insert = nilfs_direct_insert,
371 .bop_delete = nilfs_direct_delete,
374 .bop_propagate = nilfs_direct_propagate,
376 .bop_lookup_dirty_buffers = NULL,
378 .bop_assign = nilfs_direct_assign,
381 .bop_last_key = nilfs_direct_last_key,
382 .bop_check_insert = nilfs_direct_check_insert,
383 .bop_check_delete = NULL,
384 .bop_gather_data = nilfs_direct_gather_data,
388 int nilfs_direct_init(struct nilfs_bmap *bmap)
390 bmap->b_ops = &nilfs_direct_ops;