Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 1 | /* |
| 2 | * sufile.c - NILFS segment usage file. |
| 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>. |
Ryusuke Konishi | 7a65004 | 2010-03-14 03:32:40 +0900 | [diff] [blame] | 21 | * Revised by Ryusuke Konishi <ryusuke@osrg.net>. |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 22 | */ |
| 23 | |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/fs.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/buffer_head.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/nilfs2_fs.h> |
| 30 | #include "mdt.h" |
| 31 | #include "sufile.h" |
| 32 | |
| 33 | |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 34 | struct nilfs_sufile_info { |
| 35 | struct nilfs_mdt_info mi; |
| 36 | unsigned long ncleansegs; |
| 37 | }; |
| 38 | |
| 39 | static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile) |
| 40 | { |
| 41 | return (struct nilfs_sufile_info *)NILFS_MDT(sufile); |
| 42 | } |
| 43 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 44 | static inline unsigned long |
| 45 | nilfs_sufile_segment_usages_per_block(const struct inode *sufile) |
| 46 | { |
| 47 | return NILFS_MDT(sufile)->mi_entries_per_block; |
| 48 | } |
| 49 | |
| 50 | static unsigned long |
| 51 | nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum) |
| 52 | { |
| 53 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; |
| 54 | do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); |
| 55 | return (unsigned long)t; |
| 56 | } |
| 57 | |
| 58 | static unsigned long |
| 59 | nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum) |
| 60 | { |
| 61 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; |
| 62 | return do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); |
| 63 | } |
| 64 | |
| 65 | static unsigned long |
| 66 | nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr, |
| 67 | __u64 max) |
| 68 | { |
| 69 | return min_t(unsigned long, |
| 70 | nilfs_sufile_segment_usages_per_block(sufile) - |
| 71 | nilfs_sufile_get_offset(sufile, curr), |
| 72 | max - curr + 1); |
| 73 | } |
| 74 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 75 | static struct nilfs_segment_usage * |
| 76 | nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum, |
| 77 | struct buffer_head *bh, void *kaddr) |
| 78 | { |
| 79 | return kaddr + bh_offset(bh) + |
| 80 | nilfs_sufile_get_offset(sufile, segnum) * |
| 81 | NILFS_MDT(sufile)->mi_entry_size; |
| 82 | } |
| 83 | |
| 84 | static inline int nilfs_sufile_get_header_block(struct inode *sufile, |
| 85 | struct buffer_head **bhp) |
| 86 | { |
| 87 | return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp); |
| 88 | } |
| 89 | |
| 90 | static inline int |
| 91 | nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum, |
| 92 | int create, struct buffer_head **bhp) |
| 93 | { |
| 94 | return nilfs_mdt_get_block(sufile, |
| 95 | nilfs_sufile_get_blkoff(sufile, segnum), |
| 96 | create, NULL, bhp); |
| 97 | } |
| 98 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 99 | static void nilfs_sufile_mod_counter(struct buffer_head *header_bh, |
| 100 | u64 ncleanadd, u64 ndirtyadd) |
| 101 | { |
| 102 | struct nilfs_sufile_header *header; |
| 103 | void *kaddr; |
| 104 | |
| 105 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
| 106 | header = kaddr + bh_offset(header_bh); |
| 107 | le64_add_cpu(&header->sh_ncleansegs, ncleanadd); |
| 108 | le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd); |
| 109 | kunmap_atomic(kaddr, KM_USER0); |
| 110 | |
| 111 | nilfs_mdt_mark_buffer_dirty(header_bh); |
| 112 | } |
| 113 | |
Ryusuke Konishi | dda54f4 | 2009-05-16 21:49:10 +0900 | [diff] [blame] | 114 | /** |
Ryusuke Konishi | ef7d475 | 2009-11-13 08:45:32 +0900 | [diff] [blame] | 115 | * nilfs_sufile_get_ncleansegs - return the number of clean segments |
| 116 | * @sufile: inode of segment usage file |
| 117 | */ |
| 118 | unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile) |
| 119 | { |
| 120 | return NILFS_SUI(sufile)->ncleansegs; |
| 121 | } |
| 122 | |
| 123 | /** |
Ryusuke Konishi | dda54f4 | 2009-05-16 21:49:10 +0900 | [diff] [blame] | 124 | * nilfs_sufile_updatev - modify multiple segment usages at a time |
| 125 | * @sufile: inode of segment usage file |
| 126 | * @segnumv: array of segment numbers |
| 127 | * @nsegs: size of @segnumv array |
| 128 | * @create: creation flag |
| 129 | * @ndone: place to store number of modified segments on @segnumv |
| 130 | * @dofunc: primitive operation for the update |
| 131 | * |
| 132 | * Description: nilfs_sufile_updatev() repeatedly calls @dofunc |
| 133 | * against the given array of segments. The @dofunc is called with |
| 134 | * buffers of a header block and the sufile block in which the target |
| 135 | * segment usage entry is contained. If @ndone is given, the number |
| 136 | * of successfully modified segments from the head is stored in the |
| 137 | * place @ndone points to. |
| 138 | * |
| 139 | * Return Value: On success, zero is returned. On error, one of the |
| 140 | * following negative error codes is returned. |
| 141 | * |
| 142 | * %-EIO - I/O error. |
| 143 | * |
| 144 | * %-ENOMEM - Insufficient amount of memory available. |
| 145 | * |
| 146 | * %-ENOENT - Given segment usage is in hole block (may be returned if |
| 147 | * @create is zero) |
| 148 | * |
| 149 | * %-EINVAL - Invalid segment usage number |
| 150 | */ |
| 151 | int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs, |
| 152 | int create, size_t *ndone, |
| 153 | void (*dofunc)(struct inode *, __u64, |
| 154 | struct buffer_head *, |
| 155 | struct buffer_head *)) |
| 156 | { |
| 157 | struct buffer_head *header_bh, *bh; |
| 158 | unsigned long blkoff, prev_blkoff; |
| 159 | __u64 *seg; |
| 160 | size_t nerr = 0, n = 0; |
| 161 | int ret = 0; |
| 162 | |
| 163 | if (unlikely(nsegs == 0)) |
| 164 | goto out; |
| 165 | |
| 166 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 167 | for (seg = segnumv; seg < segnumv + nsegs; seg++) { |
| 168 | if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) { |
| 169 | printk(KERN_WARNING |
| 170 | "%s: invalid segment number: %llu\n", __func__, |
| 171 | (unsigned long long)*seg); |
| 172 | nerr++; |
| 173 | } |
| 174 | } |
| 175 | if (nerr > 0) { |
| 176 | ret = -EINVAL; |
| 177 | goto out_sem; |
| 178 | } |
| 179 | |
| 180 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 181 | if (ret < 0) |
| 182 | goto out_sem; |
| 183 | |
| 184 | seg = segnumv; |
| 185 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); |
| 186 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); |
| 187 | if (ret < 0) |
| 188 | goto out_header; |
| 189 | |
| 190 | for (;;) { |
| 191 | dofunc(sufile, *seg, header_bh, bh); |
| 192 | |
| 193 | if (++seg >= segnumv + nsegs) |
| 194 | break; |
| 195 | prev_blkoff = blkoff; |
| 196 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); |
| 197 | if (blkoff == prev_blkoff) |
| 198 | continue; |
| 199 | |
| 200 | /* get different block */ |
| 201 | brelse(bh); |
| 202 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); |
| 203 | if (unlikely(ret < 0)) |
| 204 | goto out_header; |
| 205 | } |
| 206 | brelse(bh); |
| 207 | |
| 208 | out_header: |
| 209 | n = seg - segnumv; |
| 210 | brelse(header_bh); |
| 211 | out_sem: |
| 212 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 213 | out: |
| 214 | if (ndone) |
| 215 | *ndone = n; |
| 216 | return ret; |
| 217 | } |
| 218 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 219 | int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, |
| 220 | void (*dofunc)(struct inode *, __u64, |
| 221 | struct buffer_head *, |
| 222 | struct buffer_head *)) |
| 223 | { |
| 224 | struct buffer_head *header_bh, *bh; |
| 225 | int ret; |
| 226 | |
| 227 | if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) { |
| 228 | printk(KERN_WARNING "%s: invalid segment number: %llu\n", |
| 229 | __func__, (unsigned long long)segnum); |
| 230 | return -EINVAL; |
| 231 | } |
| 232 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 233 | |
| 234 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 235 | if (ret < 0) |
| 236 | goto out_sem; |
| 237 | |
| 238 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh); |
| 239 | if (!ret) { |
| 240 | dofunc(sufile, segnum, header_bh, bh); |
| 241 | brelse(bh); |
| 242 | } |
| 243 | brelse(header_bh); |
| 244 | |
| 245 | out_sem: |
| 246 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 247 | return ret; |
| 248 | } |
| 249 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 250 | /** |
| 251 | * nilfs_sufile_alloc - allocate a segment |
| 252 | * @sufile: inode of segment usage file |
| 253 | * @segnump: pointer to segment number |
| 254 | * |
| 255 | * Description: nilfs_sufile_alloc() allocates a clean segment. |
| 256 | * |
| 257 | * Return Value: On success, 0 is returned and the segment number of the |
| 258 | * allocated segment is stored in the place pointed by @segnump. On error, one |
| 259 | * of the following negative error codes is returned. |
| 260 | * |
| 261 | * %-EIO - I/O error. |
| 262 | * |
| 263 | * %-ENOMEM - Insufficient amount of memory available. |
| 264 | * |
| 265 | * %-ENOSPC - No clean segment left. |
| 266 | */ |
| 267 | int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) |
| 268 | { |
| 269 | struct buffer_head *header_bh, *su_bh; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 270 | struct nilfs_sufile_header *header; |
| 271 | struct nilfs_segment_usage *su; |
| 272 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
| 273 | __u64 segnum, maxsegnum, last_alloc; |
| 274 | void *kaddr; |
| 275 | unsigned long nsegments, ncleansegs, nsus; |
| 276 | int ret, i, j; |
| 277 | |
| 278 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 279 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 280 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 281 | if (ret < 0) |
| 282 | goto out_sem; |
| 283 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
Ryusuke Konishi | 7b16c8a | 2009-11-13 03:10:21 +0900 | [diff] [blame] | 284 | header = kaddr + bh_offset(header_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 285 | ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
| 286 | last_alloc = le64_to_cpu(header->sh_last_alloc); |
| 287 | kunmap_atomic(kaddr, KM_USER0); |
| 288 | |
| 289 | nsegments = nilfs_sufile_get_nsegments(sufile); |
| 290 | segnum = last_alloc + 1; |
| 291 | maxsegnum = nsegments - 1; |
| 292 | for (i = 0; i < nsegments; i += nsus) { |
| 293 | if (segnum >= nsegments) { |
| 294 | /* wrap around */ |
| 295 | segnum = 0; |
| 296 | maxsegnum = last_alloc; |
| 297 | } |
| 298 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, |
| 299 | &su_bh); |
| 300 | if (ret < 0) |
| 301 | goto out_header; |
| 302 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 303 | su = nilfs_sufile_block_get_segment_usage( |
| 304 | sufile, segnum, su_bh, kaddr); |
| 305 | |
| 306 | nsus = nilfs_sufile_segment_usages_in_block( |
| 307 | sufile, segnum, maxsegnum); |
| 308 | for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) { |
| 309 | if (!nilfs_segment_usage_clean(su)) |
| 310 | continue; |
| 311 | /* found a clean segment */ |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 312 | nilfs_segment_usage_set_dirty(su); |
| 313 | kunmap_atomic(kaddr, KM_USER0); |
| 314 | |
| 315 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
Ryusuke Konishi | 7b16c8a | 2009-11-13 03:10:21 +0900 | [diff] [blame] | 316 | header = kaddr + bh_offset(header_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 317 | le64_add_cpu(&header->sh_ncleansegs, -1); |
| 318 | le64_add_cpu(&header->sh_ndirtysegs, 1); |
| 319 | header->sh_last_alloc = cpu_to_le64(segnum); |
| 320 | kunmap_atomic(kaddr, KM_USER0); |
| 321 | |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 322 | NILFS_SUI(sufile)->ncleansegs--; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 323 | nilfs_mdt_mark_buffer_dirty(header_bh); |
| 324 | nilfs_mdt_mark_buffer_dirty(su_bh); |
| 325 | nilfs_mdt_mark_dirty(sufile); |
| 326 | brelse(su_bh); |
| 327 | *segnump = segnum; |
| 328 | goto out_header; |
| 329 | } |
| 330 | |
| 331 | kunmap_atomic(kaddr, KM_USER0); |
| 332 | brelse(su_bh); |
| 333 | } |
| 334 | |
| 335 | /* no segments left */ |
| 336 | ret = -ENOSPC; |
| 337 | |
| 338 | out_header: |
| 339 | brelse(header_bh); |
| 340 | |
| 341 | out_sem: |
| 342 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 343 | return ret; |
| 344 | } |
| 345 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 346 | void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum, |
| 347 | struct buffer_head *header_bh, |
| 348 | struct buffer_head *su_bh) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 349 | { |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 350 | struct nilfs_segment_usage *su; |
| 351 | void *kaddr; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 352 | |
| 353 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 354 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 355 | if (unlikely(!nilfs_segment_usage_clean(su))) { |
| 356 | printk(KERN_WARNING "%s: segment %llu must be clean\n", |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 357 | __func__, (unsigned long long)segnum); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 358 | kunmap_atomic(kaddr, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 359 | return; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 360 | } |
| 361 | nilfs_segment_usage_set_dirty(su); |
| 362 | kunmap_atomic(kaddr, KM_USER0); |
| 363 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 364 | nilfs_sufile_mod_counter(header_bh, -1, 1); |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 365 | NILFS_SUI(sufile)->ncleansegs--; |
| 366 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 367 | nilfs_mdt_mark_buffer_dirty(su_bh); |
| 368 | nilfs_mdt_mark_dirty(sufile); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 369 | } |
| 370 | |
Ryusuke Konishi | c85399c | 2009-04-05 18:30:58 +0900 | [diff] [blame] | 371 | void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum, |
| 372 | struct buffer_head *header_bh, |
| 373 | struct buffer_head *su_bh) |
| 374 | { |
| 375 | struct nilfs_segment_usage *su; |
| 376 | void *kaddr; |
| 377 | int clean, dirty; |
| 378 | |
| 379 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 380 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
| 381 | if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) && |
| 382 | su->su_nblocks == cpu_to_le32(0)) { |
| 383 | kunmap_atomic(kaddr, KM_USER0); |
| 384 | return; |
| 385 | } |
| 386 | clean = nilfs_segment_usage_clean(su); |
| 387 | dirty = nilfs_segment_usage_dirty(su); |
| 388 | |
| 389 | /* make the segment garbage */ |
| 390 | su->su_lastmod = cpu_to_le64(0); |
| 391 | su->su_nblocks = cpu_to_le32(0); |
| 392 | su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY); |
| 393 | kunmap_atomic(kaddr, KM_USER0); |
| 394 | |
| 395 | nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1); |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 396 | NILFS_SUI(sufile)->ncleansegs -= clean; |
| 397 | |
Ryusuke Konishi | c85399c | 2009-04-05 18:30:58 +0900 | [diff] [blame] | 398 | nilfs_mdt_mark_buffer_dirty(su_bh); |
| 399 | nilfs_mdt_mark_dirty(sufile); |
| 400 | } |
| 401 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 402 | void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, |
| 403 | struct buffer_head *header_bh, |
| 404 | struct buffer_head *su_bh) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 405 | { |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 406 | struct nilfs_segment_usage *su; |
| 407 | void *kaddr; |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 408 | int sudirty; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 409 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 410 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 411 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
| 412 | if (nilfs_segment_usage_clean(su)) { |
| 413 | printk(KERN_WARNING "%s: segment %llu is already clean\n", |
| 414 | __func__, (unsigned long long)segnum); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 415 | kunmap_atomic(kaddr, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 416 | return; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 417 | } |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 418 | WARN_ON(nilfs_segment_usage_error(su)); |
| 419 | WARN_ON(!nilfs_segment_usage_dirty(su)); |
| 420 | |
| 421 | sudirty = nilfs_segment_usage_dirty(su); |
| 422 | nilfs_segment_usage_set_clean(su); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 423 | kunmap_atomic(kaddr, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 424 | nilfs_mdt_mark_buffer_dirty(su_bh); |
| 425 | |
| 426 | nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0); |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 427 | NILFS_SUI(sufile)->ncleansegs++; |
| 428 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 429 | nilfs_mdt_mark_dirty(sufile); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | /** |
Ryusuke Konishi | 61a189e | 2009-11-18 17:25:12 +0900 | [diff] [blame] | 433 | * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty |
| 434 | * @sufile: inode of segment usage file |
| 435 | * @segnum: segment number |
| 436 | */ |
| 437 | int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum) |
| 438 | { |
| 439 | struct buffer_head *bh; |
| 440 | int ret; |
| 441 | |
| 442 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh); |
| 443 | if (!ret) { |
| 444 | nilfs_mdt_mark_buffer_dirty(bh); |
| 445 | nilfs_mdt_mark_dirty(sufile); |
| 446 | brelse(bh); |
| 447 | } |
| 448 | return ret; |
| 449 | } |
| 450 | |
| 451 | /** |
Ryusuke Konishi | 071ec54 | 2009-11-18 18:23:34 +0900 | [diff] [blame] | 452 | * nilfs_sufile_set_segment_usage - set usage of a segment |
| 453 | * @sufile: inode of segment usage file |
| 454 | * @segnum: segment number |
| 455 | * @nblocks: number of live blocks in the segment |
| 456 | * @modtime: modification time (option) |
| 457 | */ |
| 458 | int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum, |
| 459 | unsigned long nblocks, time_t modtime) |
| 460 | { |
| 461 | struct buffer_head *bh; |
| 462 | struct nilfs_segment_usage *su; |
| 463 | void *kaddr; |
| 464 | int ret; |
| 465 | |
| 466 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 467 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh); |
| 468 | if (ret < 0) |
| 469 | goto out_sem; |
| 470 | |
| 471 | kaddr = kmap_atomic(bh->b_page, KM_USER0); |
| 472 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr); |
| 473 | WARN_ON(nilfs_segment_usage_error(su)); |
| 474 | if (modtime) |
| 475 | su->su_lastmod = cpu_to_le64(modtime); |
| 476 | su->su_nblocks = cpu_to_le32(nblocks); |
| 477 | kunmap_atomic(kaddr, KM_USER0); |
| 478 | |
| 479 | nilfs_mdt_mark_buffer_dirty(bh); |
| 480 | nilfs_mdt_mark_dirty(sufile); |
| 481 | brelse(bh); |
| 482 | |
| 483 | out_sem: |
| 484 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 485 | return ret; |
| 486 | } |
| 487 | |
| 488 | /** |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 489 | * nilfs_sufile_get_stat - get segment usage statistics |
| 490 | * @sufile: inode of segment usage file |
| 491 | * @stat: pointer to a structure of segment usage statistics |
| 492 | * |
| 493 | * Description: nilfs_sufile_get_stat() returns information about segment |
| 494 | * usage. |
| 495 | * |
| 496 | * Return Value: On success, 0 is returned, and segment usage information is |
| 497 | * stored in the place pointed by @stat. On error, one of the following |
| 498 | * negative error codes is returned. |
| 499 | * |
| 500 | * %-EIO - I/O error. |
| 501 | * |
| 502 | * %-ENOMEM - Insufficient amount of memory available. |
| 503 | */ |
| 504 | int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat) |
| 505 | { |
| 506 | struct buffer_head *header_bh; |
| 507 | struct nilfs_sufile_header *header; |
Ryusuke Konishi | 2c2e52f | 2009-04-06 19:01:54 -0700 | [diff] [blame] | 508 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 509 | void *kaddr; |
| 510 | int ret; |
| 511 | |
| 512 | down_read(&NILFS_MDT(sufile)->mi_sem); |
| 513 | |
| 514 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 515 | if (ret < 0) |
| 516 | goto out_sem; |
| 517 | |
| 518 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
Ryusuke Konishi | 7b16c8a | 2009-11-13 03:10:21 +0900 | [diff] [blame] | 519 | header = kaddr + bh_offset(header_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 520 | sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile); |
| 521 | sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
| 522 | sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs); |
Ryusuke Konishi | 2c2e52f | 2009-04-06 19:01:54 -0700 | [diff] [blame] | 523 | sustat->ss_ctime = nilfs->ns_ctime; |
| 524 | sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime; |
| 525 | spin_lock(&nilfs->ns_last_segment_lock); |
| 526 | sustat->ss_prot_seq = nilfs->ns_prot_seq; |
| 527 | spin_unlock(&nilfs->ns_last_segment_lock); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 528 | kunmap_atomic(kaddr, KM_USER0); |
| 529 | brelse(header_bh); |
| 530 | |
| 531 | out_sem: |
| 532 | up_read(&NILFS_MDT(sufile)->mi_sem); |
| 533 | return ret; |
| 534 | } |
| 535 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 536 | void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum, |
| 537 | struct buffer_head *header_bh, |
| 538 | struct buffer_head *su_bh) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 539 | { |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 540 | struct nilfs_segment_usage *su; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 541 | void *kaddr; |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 542 | int suclean; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 543 | |
| 544 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 545 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
| 546 | if (nilfs_segment_usage_error(su)) { |
| 547 | kunmap_atomic(kaddr, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 548 | return; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 549 | } |
Ryusuke Konishi | 88072fa | 2009-04-05 15:03:16 +0900 | [diff] [blame] | 550 | suclean = nilfs_segment_usage_clean(su); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 551 | nilfs_segment_usage_set_error(su); |
| 552 | kunmap_atomic(kaddr, KM_USER0); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 553 | |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 554 | if (suclean) { |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 555 | nilfs_sufile_mod_counter(header_bh, -1, 0); |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 556 | NILFS_SUI(sufile)->ncleansegs--; |
| 557 | } |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 558 | nilfs_mdt_mark_buffer_dirty(su_bh); |
| 559 | nilfs_mdt_mark_dirty(sufile); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | /** |
| 563 | * nilfs_sufile_get_suinfo - |
| 564 | * @sufile: inode of segment usage file |
| 565 | * @segnum: segment number to start looking |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 566 | * @buf: array of suinfo |
| 567 | * @sisz: byte size of suinfo |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 568 | * @nsi: size of suinfo array |
| 569 | * |
| 570 | * Description: |
| 571 | * |
| 572 | * Return Value: On success, 0 is returned and .... On error, one of the |
| 573 | * following negative error codes is returned. |
| 574 | * |
| 575 | * %-EIO - I/O error. |
| 576 | * |
| 577 | * %-ENOMEM - Insufficient amount of memory available. |
| 578 | */ |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 579 | ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf, |
| 580 | unsigned sisz, size_t nsi) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 581 | { |
| 582 | struct buffer_head *su_bh; |
| 583 | struct nilfs_segment_usage *su; |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 584 | struct nilfs_suinfo *si = buf; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 585 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 586 | struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 587 | void *kaddr; |
| 588 | unsigned long nsegs, segusages_per_block; |
| 589 | ssize_t n; |
| 590 | int ret, i, j; |
| 591 | |
| 592 | down_read(&NILFS_MDT(sufile)->mi_sem); |
| 593 | |
| 594 | segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); |
| 595 | nsegs = min_t(unsigned long, |
| 596 | nilfs_sufile_get_nsegments(sufile) - segnum, |
| 597 | nsi); |
| 598 | for (i = 0; i < nsegs; i += n, segnum += n) { |
| 599 | n = min_t(unsigned long, |
| 600 | segusages_per_block - |
| 601 | nilfs_sufile_get_offset(sufile, segnum), |
| 602 | nsegs - i); |
| 603 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, |
| 604 | &su_bh); |
| 605 | if (ret < 0) { |
| 606 | if (ret != -ENOENT) |
| 607 | goto out; |
| 608 | /* hole */ |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 609 | memset(si, 0, sisz * n); |
| 610 | si = (void *)si + sisz * n; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 611 | continue; |
| 612 | } |
| 613 | |
| 614 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 615 | su = nilfs_sufile_block_get_segment_usage( |
| 616 | sufile, segnum, su_bh, kaddr); |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 617 | for (j = 0; j < n; |
| 618 | j++, su = (void *)su + susz, si = (void *)si + sisz) { |
| 619 | si->sui_lastmod = le64_to_cpu(su->su_lastmod); |
| 620 | si->sui_nblocks = le32_to_cpu(su->su_nblocks); |
| 621 | si->sui_flags = le32_to_cpu(su->su_flags) & |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 622 | ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
Ryusuke Konishi | 3efb55b | 2009-03-30 00:50:19 +0900 | [diff] [blame] | 623 | if (nilfs_segment_is_active(nilfs, segnum + j)) |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 624 | si->sui_flags |= |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 625 | (1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 626 | } |
| 627 | kunmap_atomic(kaddr, KM_USER0); |
| 628 | brelse(su_bh); |
| 629 | } |
| 630 | ret = nsegs; |
| 631 | |
| 632 | out: |
| 633 | up_read(&NILFS_MDT(sufile)->mi_sem); |
| 634 | return ret; |
| 635 | } |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 636 | |
| 637 | /** |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 638 | * nilfs_sufile_read - read or get sufile inode |
| 639 | * @sb: super block instance |
| 640 | * @susize: size of a segment usage entry |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 641 | * @raw_inode: on-disk sufile inode |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 642 | * @inodep: buffer to store the inode |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 643 | */ |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 644 | int nilfs_sufile_read(struct super_block *sb, size_t susize, |
| 645 | struct nilfs_inode *raw_inode, struct inode **inodep) |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 646 | { |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 647 | struct inode *sufile; |
| 648 | struct nilfs_sufile_info *sui; |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 649 | struct buffer_head *header_bh; |
| 650 | struct nilfs_sufile_header *header; |
| 651 | void *kaddr; |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 652 | int err; |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 653 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 654 | sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO); |
| 655 | if (unlikely(!sufile)) |
| 656 | return -ENOMEM; |
| 657 | if (!(sufile->i_state & I_NEW)) |
| 658 | goto out; |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 659 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 660 | err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui)); |
| 661 | if (err) |
| 662 | goto failed; |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 663 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 664 | nilfs_mdt_set_entry_size(sufile, susize, |
| 665 | sizeof(struct nilfs_sufile_header)); |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 666 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame^] | 667 | err = nilfs_read_inode_common(sufile, raw_inode); |
| 668 | if (err) |
| 669 | goto failed; |
| 670 | |
| 671 | err = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 672 | if (err) |
| 673 | goto failed; |
| 674 | |
| 675 | sui = NILFS_SUI(sufile); |
| 676 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
| 677 | header = kaddr + bh_offset(header_bh); |
| 678 | sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
| 679 | kunmap_atomic(kaddr, KM_USER0); |
| 680 | brelse(header_bh); |
| 681 | |
| 682 | unlock_new_inode(sufile); |
| 683 | out: |
| 684 | *inodep = sufile; |
| 685 | return 0; |
| 686 | failed: |
| 687 | iget_failed(sufile); |
| 688 | return err; |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 689 | } |