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; |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 36 | unsigned long ncleansegs;/* number of clean segments */ |
| 37 | __u64 allocmin; /* lower limit of allocatable segment range */ |
| 38 | __u64 allocmax; /* upper limit of allocatable segment range */ |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 39 | }; |
| 40 | |
| 41 | static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile) |
| 42 | { |
| 43 | return (struct nilfs_sufile_info *)NILFS_MDT(sufile); |
| 44 | } |
| 45 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 46 | static inline unsigned long |
| 47 | nilfs_sufile_segment_usages_per_block(const struct inode *sufile) |
| 48 | { |
| 49 | return NILFS_MDT(sufile)->mi_entries_per_block; |
| 50 | } |
| 51 | |
| 52 | static unsigned long |
| 53 | nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum) |
| 54 | { |
| 55 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; |
| 56 | do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); |
| 57 | return (unsigned long)t; |
| 58 | } |
| 59 | |
| 60 | static unsigned long |
| 61 | nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum) |
| 62 | { |
| 63 | __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; |
| 64 | return do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); |
| 65 | } |
| 66 | |
| 67 | static unsigned long |
| 68 | nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr, |
| 69 | __u64 max) |
| 70 | { |
| 71 | return min_t(unsigned long, |
| 72 | nilfs_sufile_segment_usages_per_block(sufile) - |
| 73 | nilfs_sufile_get_offset(sufile, curr), |
| 74 | max - curr + 1); |
| 75 | } |
| 76 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 77 | static struct nilfs_segment_usage * |
| 78 | nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum, |
| 79 | struct buffer_head *bh, void *kaddr) |
| 80 | { |
| 81 | return kaddr + bh_offset(bh) + |
| 82 | nilfs_sufile_get_offset(sufile, segnum) * |
| 83 | NILFS_MDT(sufile)->mi_entry_size; |
| 84 | } |
| 85 | |
| 86 | static inline int nilfs_sufile_get_header_block(struct inode *sufile, |
| 87 | struct buffer_head **bhp) |
| 88 | { |
| 89 | return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp); |
| 90 | } |
| 91 | |
| 92 | static inline int |
| 93 | nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum, |
| 94 | int create, struct buffer_head **bhp) |
| 95 | { |
| 96 | return nilfs_mdt_get_block(sufile, |
| 97 | nilfs_sufile_get_blkoff(sufile, segnum), |
| 98 | create, NULL, bhp); |
| 99 | } |
| 100 | |
Ryusuke Konishi | 78eb64c | 2011-05-05 01:23:58 +0900 | [diff] [blame] | 101 | static int nilfs_sufile_delete_segment_usage_block(struct inode *sufile, |
| 102 | __u64 segnum) |
| 103 | { |
| 104 | return nilfs_mdt_delete_block(sufile, |
| 105 | nilfs_sufile_get_blkoff(sufile, segnum)); |
| 106 | } |
| 107 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 108 | static void nilfs_sufile_mod_counter(struct buffer_head *header_bh, |
| 109 | u64 ncleanadd, u64 ndirtyadd) |
| 110 | { |
| 111 | struct nilfs_sufile_header *header; |
| 112 | void *kaddr; |
| 113 | |
| 114 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
| 115 | header = kaddr + bh_offset(header_bh); |
| 116 | le64_add_cpu(&header->sh_ncleansegs, ncleanadd); |
| 117 | le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd); |
| 118 | kunmap_atomic(kaddr, KM_USER0); |
| 119 | |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 120 | mark_buffer_dirty(header_bh); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 121 | } |
| 122 | |
Ryusuke Konishi | dda54f4 | 2009-05-16 21:49:10 +0900 | [diff] [blame] | 123 | /** |
Ryusuke Konishi | ef7d475 | 2009-11-13 08:45:32 +0900 | [diff] [blame] | 124 | * nilfs_sufile_get_ncleansegs - return the number of clean segments |
| 125 | * @sufile: inode of segment usage file |
| 126 | */ |
| 127 | unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile) |
| 128 | { |
| 129 | return NILFS_SUI(sufile)->ncleansegs; |
| 130 | } |
| 131 | |
| 132 | /** |
Ryusuke Konishi | dda54f4 | 2009-05-16 21:49:10 +0900 | [diff] [blame] | 133 | * nilfs_sufile_updatev - modify multiple segment usages at a time |
| 134 | * @sufile: inode of segment usage file |
| 135 | * @segnumv: array of segment numbers |
| 136 | * @nsegs: size of @segnumv array |
| 137 | * @create: creation flag |
| 138 | * @ndone: place to store number of modified segments on @segnumv |
| 139 | * @dofunc: primitive operation for the update |
| 140 | * |
| 141 | * Description: nilfs_sufile_updatev() repeatedly calls @dofunc |
| 142 | * against the given array of segments. The @dofunc is called with |
| 143 | * buffers of a header block and the sufile block in which the target |
| 144 | * segment usage entry is contained. If @ndone is given, the number |
| 145 | * of successfully modified segments from the head is stored in the |
| 146 | * place @ndone points to. |
| 147 | * |
| 148 | * Return Value: On success, zero is returned. On error, one of the |
| 149 | * following negative error codes is returned. |
| 150 | * |
| 151 | * %-EIO - I/O error. |
| 152 | * |
| 153 | * %-ENOMEM - Insufficient amount of memory available. |
| 154 | * |
| 155 | * %-ENOENT - Given segment usage is in hole block (may be returned if |
| 156 | * @create is zero) |
| 157 | * |
| 158 | * %-EINVAL - Invalid segment usage number |
| 159 | */ |
| 160 | int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs, |
| 161 | int create, size_t *ndone, |
| 162 | void (*dofunc)(struct inode *, __u64, |
| 163 | struct buffer_head *, |
| 164 | struct buffer_head *)) |
| 165 | { |
| 166 | struct buffer_head *header_bh, *bh; |
| 167 | unsigned long blkoff, prev_blkoff; |
| 168 | __u64 *seg; |
| 169 | size_t nerr = 0, n = 0; |
| 170 | int ret = 0; |
| 171 | |
| 172 | if (unlikely(nsegs == 0)) |
| 173 | goto out; |
| 174 | |
| 175 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 176 | for (seg = segnumv; seg < segnumv + nsegs; seg++) { |
| 177 | if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) { |
| 178 | printk(KERN_WARNING |
| 179 | "%s: invalid segment number: %llu\n", __func__, |
| 180 | (unsigned long long)*seg); |
| 181 | nerr++; |
| 182 | } |
| 183 | } |
| 184 | if (nerr > 0) { |
| 185 | ret = -EINVAL; |
| 186 | goto out_sem; |
| 187 | } |
| 188 | |
| 189 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 190 | if (ret < 0) |
| 191 | goto out_sem; |
| 192 | |
| 193 | seg = segnumv; |
| 194 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); |
| 195 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); |
| 196 | if (ret < 0) |
| 197 | goto out_header; |
| 198 | |
| 199 | for (;;) { |
| 200 | dofunc(sufile, *seg, header_bh, bh); |
| 201 | |
| 202 | if (++seg >= segnumv + nsegs) |
| 203 | break; |
| 204 | prev_blkoff = blkoff; |
| 205 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); |
| 206 | if (blkoff == prev_blkoff) |
| 207 | continue; |
| 208 | |
| 209 | /* get different block */ |
| 210 | brelse(bh); |
| 211 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); |
| 212 | if (unlikely(ret < 0)) |
| 213 | goto out_header; |
| 214 | } |
| 215 | brelse(bh); |
| 216 | |
| 217 | out_header: |
| 218 | n = seg - segnumv; |
| 219 | brelse(header_bh); |
| 220 | out_sem: |
| 221 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 222 | out: |
| 223 | if (ndone) |
| 224 | *ndone = n; |
| 225 | return ret; |
| 226 | } |
| 227 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 228 | int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, |
| 229 | void (*dofunc)(struct inode *, __u64, |
| 230 | struct buffer_head *, |
| 231 | struct buffer_head *)) |
| 232 | { |
| 233 | struct buffer_head *header_bh, *bh; |
| 234 | int ret; |
| 235 | |
| 236 | if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) { |
| 237 | printk(KERN_WARNING "%s: invalid segment number: %llu\n", |
| 238 | __func__, (unsigned long long)segnum); |
| 239 | return -EINVAL; |
| 240 | } |
| 241 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 242 | |
| 243 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 244 | if (ret < 0) |
| 245 | goto out_sem; |
| 246 | |
| 247 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh); |
| 248 | if (!ret) { |
| 249 | dofunc(sufile, segnum, header_bh, bh); |
| 250 | brelse(bh); |
| 251 | } |
| 252 | brelse(header_bh); |
| 253 | |
| 254 | out_sem: |
| 255 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 256 | return ret; |
| 257 | } |
| 258 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 259 | /** |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 260 | * nilfs_sufile_set_alloc_range - limit range of segment to be allocated |
| 261 | * @sufile: inode of segment usage file |
| 262 | * @start: minimum segment number of allocatable region (inclusive) |
| 263 | * @end: maximum segment number of allocatable region (inclusive) |
| 264 | * |
| 265 | * Return Value: On success, 0 is returned. On error, one of the |
| 266 | * following negative error codes is returned. |
| 267 | * |
| 268 | * %-ERANGE - invalid segment region |
| 269 | */ |
| 270 | int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end) |
| 271 | { |
| 272 | struct nilfs_sufile_info *sui = NILFS_SUI(sufile); |
| 273 | __u64 nsegs; |
| 274 | int ret = -ERANGE; |
| 275 | |
| 276 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 277 | nsegs = nilfs_sufile_get_nsegments(sufile); |
| 278 | |
| 279 | if (start <= end && end < nsegs) { |
| 280 | sui->allocmin = start; |
| 281 | sui->allocmax = end; |
| 282 | ret = 0; |
| 283 | } |
| 284 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | /** |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 289 | * nilfs_sufile_alloc - allocate a segment |
| 290 | * @sufile: inode of segment usage file |
| 291 | * @segnump: pointer to segment number |
| 292 | * |
| 293 | * Description: nilfs_sufile_alloc() allocates a clean segment. |
| 294 | * |
| 295 | * Return Value: On success, 0 is returned and the segment number of the |
| 296 | * allocated segment is stored in the place pointed by @segnump. On error, one |
| 297 | * of the following negative error codes is returned. |
| 298 | * |
| 299 | * %-EIO - I/O error. |
| 300 | * |
| 301 | * %-ENOMEM - Insufficient amount of memory available. |
| 302 | * |
| 303 | * %-ENOSPC - No clean segment left. |
| 304 | */ |
| 305 | int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) |
| 306 | { |
| 307 | struct buffer_head *header_bh, *su_bh; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 308 | struct nilfs_sufile_header *header; |
| 309 | struct nilfs_segment_usage *su; |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 310 | struct nilfs_sufile_info *sui = NILFS_SUI(sufile); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 311 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
| 312 | __u64 segnum, maxsegnum, last_alloc; |
| 313 | void *kaddr; |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 314 | unsigned long nsegments, ncleansegs, nsus, cnt; |
| 315 | int ret, j; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 316 | |
| 317 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 318 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 319 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 320 | if (ret < 0) |
| 321 | goto out_sem; |
| 322 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
Ryusuke Konishi | 7b16c8a | 2009-11-13 03:10:21 +0900 | [diff] [blame] | 323 | header = kaddr + bh_offset(header_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 324 | ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
| 325 | last_alloc = le64_to_cpu(header->sh_last_alloc); |
| 326 | kunmap_atomic(kaddr, KM_USER0); |
| 327 | |
| 328 | nsegments = nilfs_sufile_get_nsegments(sufile); |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 329 | maxsegnum = sui->allocmax; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 330 | segnum = last_alloc + 1; |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 331 | if (segnum < sui->allocmin || segnum > sui->allocmax) |
| 332 | segnum = sui->allocmin; |
| 333 | |
| 334 | for (cnt = 0; cnt < nsegments; cnt += nsus) { |
| 335 | if (segnum > maxsegnum) { |
| 336 | if (cnt < sui->allocmax - sui->allocmin + 1) { |
| 337 | /* |
| 338 | * wrap around in the limited region. |
| 339 | * if allocation started from |
| 340 | * sui->allocmin, this never happens. |
| 341 | */ |
| 342 | segnum = sui->allocmin; |
| 343 | maxsegnum = last_alloc; |
| 344 | } else if (segnum > sui->allocmin && |
| 345 | sui->allocmax + 1 < nsegments) { |
| 346 | segnum = sui->allocmax + 1; |
| 347 | maxsegnum = nsegments - 1; |
| 348 | } else if (sui->allocmin > 0) { |
| 349 | segnum = 0; |
| 350 | maxsegnum = sui->allocmin - 1; |
| 351 | } else { |
| 352 | break; /* never happens */ |
| 353 | } |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 354 | } |
| 355 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, |
| 356 | &su_bh); |
| 357 | if (ret < 0) |
| 358 | goto out_header; |
| 359 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 360 | su = nilfs_sufile_block_get_segment_usage( |
| 361 | sufile, segnum, su_bh, kaddr); |
| 362 | |
| 363 | nsus = nilfs_sufile_segment_usages_in_block( |
| 364 | sufile, segnum, maxsegnum); |
| 365 | for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) { |
| 366 | if (!nilfs_segment_usage_clean(su)) |
| 367 | continue; |
| 368 | /* found a clean segment */ |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 369 | nilfs_segment_usage_set_dirty(su); |
| 370 | kunmap_atomic(kaddr, KM_USER0); |
| 371 | |
| 372 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
Ryusuke Konishi | 7b16c8a | 2009-11-13 03:10:21 +0900 | [diff] [blame] | 373 | header = kaddr + bh_offset(header_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 374 | le64_add_cpu(&header->sh_ncleansegs, -1); |
| 375 | le64_add_cpu(&header->sh_ndirtysegs, 1); |
| 376 | header->sh_last_alloc = cpu_to_le64(segnum); |
| 377 | kunmap_atomic(kaddr, KM_USER0); |
| 378 | |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 379 | sui->ncleansegs--; |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 380 | mark_buffer_dirty(header_bh); |
| 381 | mark_buffer_dirty(su_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 382 | nilfs_mdt_mark_dirty(sufile); |
| 383 | brelse(su_bh); |
| 384 | *segnump = segnum; |
| 385 | goto out_header; |
| 386 | } |
| 387 | |
| 388 | kunmap_atomic(kaddr, KM_USER0); |
| 389 | brelse(su_bh); |
| 390 | } |
| 391 | |
| 392 | /* no segments left */ |
| 393 | ret = -ENOSPC; |
| 394 | |
| 395 | out_header: |
| 396 | brelse(header_bh); |
| 397 | |
| 398 | out_sem: |
| 399 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 400 | return ret; |
| 401 | } |
| 402 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 403 | void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum, |
| 404 | struct buffer_head *header_bh, |
| 405 | struct buffer_head *su_bh) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 406 | { |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 407 | struct nilfs_segment_usage *su; |
| 408 | void *kaddr; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 409 | |
| 410 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 411 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 412 | if (unlikely(!nilfs_segment_usage_clean(su))) { |
| 413 | printk(KERN_WARNING "%s: segment %llu must be clean\n", |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 414 | __func__, (unsigned long long)segnum); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -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 | } |
| 418 | nilfs_segment_usage_set_dirty(su); |
| 419 | kunmap_atomic(kaddr, KM_USER0); |
| 420 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 421 | nilfs_sufile_mod_counter(header_bh, -1, 1); |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 422 | NILFS_SUI(sufile)->ncleansegs--; |
| 423 | |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 424 | mark_buffer_dirty(su_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 425 | nilfs_mdt_mark_dirty(sufile); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 426 | } |
| 427 | |
Ryusuke Konishi | c85399c | 2009-04-05 18:30:58 +0900 | [diff] [blame] | 428 | void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum, |
| 429 | struct buffer_head *header_bh, |
| 430 | struct buffer_head *su_bh) |
| 431 | { |
| 432 | struct nilfs_segment_usage *su; |
| 433 | void *kaddr; |
| 434 | int clean, dirty; |
| 435 | |
| 436 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 437 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
| 438 | if (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) && |
| 439 | su->su_nblocks == cpu_to_le32(0)) { |
| 440 | kunmap_atomic(kaddr, KM_USER0); |
| 441 | return; |
| 442 | } |
| 443 | clean = nilfs_segment_usage_clean(su); |
| 444 | dirty = nilfs_segment_usage_dirty(su); |
| 445 | |
| 446 | /* make the segment garbage */ |
| 447 | su->su_lastmod = cpu_to_le64(0); |
| 448 | su->su_nblocks = cpu_to_le32(0); |
| 449 | su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY); |
| 450 | kunmap_atomic(kaddr, KM_USER0); |
| 451 | |
| 452 | 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] | 453 | NILFS_SUI(sufile)->ncleansegs -= clean; |
| 454 | |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 455 | mark_buffer_dirty(su_bh); |
Ryusuke Konishi | c85399c | 2009-04-05 18:30:58 +0900 | [diff] [blame] | 456 | nilfs_mdt_mark_dirty(sufile); |
| 457 | } |
| 458 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 459 | void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, |
| 460 | struct buffer_head *header_bh, |
| 461 | struct buffer_head *su_bh) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 462 | { |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 463 | struct nilfs_segment_usage *su; |
| 464 | void *kaddr; |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 465 | int sudirty; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 466 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 467 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 468 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
| 469 | if (nilfs_segment_usage_clean(su)) { |
| 470 | printk(KERN_WARNING "%s: segment %llu is already clean\n", |
| 471 | __func__, (unsigned long long)segnum); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 472 | kunmap_atomic(kaddr, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 473 | return; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 474 | } |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 475 | WARN_ON(nilfs_segment_usage_error(su)); |
| 476 | WARN_ON(!nilfs_segment_usage_dirty(su)); |
| 477 | |
| 478 | sudirty = nilfs_segment_usage_dirty(su); |
| 479 | nilfs_segment_usage_set_clean(su); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 480 | kunmap_atomic(kaddr, KM_USER0); |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 481 | mark_buffer_dirty(su_bh); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 482 | |
| 483 | nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0); |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 484 | NILFS_SUI(sufile)->ncleansegs++; |
| 485 | |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 486 | nilfs_mdt_mark_dirty(sufile); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | /** |
Ryusuke Konishi | 61a189e | 2009-11-18 17:25:12 +0900 | [diff] [blame] | 490 | * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty |
| 491 | * @sufile: inode of segment usage file |
| 492 | * @segnum: segment number |
| 493 | */ |
| 494 | int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum) |
| 495 | { |
| 496 | struct buffer_head *bh; |
| 497 | int ret; |
| 498 | |
| 499 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh); |
| 500 | if (!ret) { |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 501 | mark_buffer_dirty(bh); |
Ryusuke Konishi | 61a189e | 2009-11-18 17:25:12 +0900 | [diff] [blame] | 502 | nilfs_mdt_mark_dirty(sufile); |
| 503 | brelse(bh); |
| 504 | } |
| 505 | return ret; |
| 506 | } |
| 507 | |
| 508 | /** |
Ryusuke Konishi | 071ec54 | 2009-11-18 18:23:34 +0900 | [diff] [blame] | 509 | * nilfs_sufile_set_segment_usage - set usage of a segment |
| 510 | * @sufile: inode of segment usage file |
| 511 | * @segnum: segment number |
| 512 | * @nblocks: number of live blocks in the segment |
| 513 | * @modtime: modification time (option) |
| 514 | */ |
| 515 | int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum, |
| 516 | unsigned long nblocks, time_t modtime) |
| 517 | { |
| 518 | struct buffer_head *bh; |
| 519 | struct nilfs_segment_usage *su; |
| 520 | void *kaddr; |
| 521 | int ret; |
| 522 | |
| 523 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 524 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh); |
| 525 | if (ret < 0) |
| 526 | goto out_sem; |
| 527 | |
| 528 | kaddr = kmap_atomic(bh->b_page, KM_USER0); |
| 529 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr); |
| 530 | WARN_ON(nilfs_segment_usage_error(su)); |
| 531 | if (modtime) |
| 532 | su->su_lastmod = cpu_to_le64(modtime); |
| 533 | su->su_nblocks = cpu_to_le32(nblocks); |
| 534 | kunmap_atomic(kaddr, KM_USER0); |
| 535 | |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 536 | mark_buffer_dirty(bh); |
Ryusuke Konishi | 071ec54 | 2009-11-18 18:23:34 +0900 | [diff] [blame] | 537 | nilfs_mdt_mark_dirty(sufile); |
| 538 | brelse(bh); |
| 539 | |
| 540 | out_sem: |
| 541 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 542 | return ret; |
| 543 | } |
| 544 | |
| 545 | /** |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 546 | * nilfs_sufile_get_stat - get segment usage statistics |
| 547 | * @sufile: inode of segment usage file |
| 548 | * @stat: pointer to a structure of segment usage statistics |
| 549 | * |
| 550 | * Description: nilfs_sufile_get_stat() returns information about segment |
| 551 | * usage. |
| 552 | * |
| 553 | * Return Value: On success, 0 is returned, and segment usage information is |
| 554 | * stored in the place pointed by @stat. On error, one of the following |
| 555 | * negative error codes is returned. |
| 556 | * |
| 557 | * %-EIO - I/O error. |
| 558 | * |
| 559 | * %-ENOMEM - Insufficient amount of memory available. |
| 560 | */ |
| 561 | int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat) |
| 562 | { |
| 563 | struct buffer_head *header_bh; |
| 564 | struct nilfs_sufile_header *header; |
Ryusuke Konishi | 0ef28f9 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 565 | struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 566 | void *kaddr; |
| 567 | int ret; |
| 568 | |
| 569 | down_read(&NILFS_MDT(sufile)->mi_sem); |
| 570 | |
| 571 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 572 | if (ret < 0) |
| 573 | goto out_sem; |
| 574 | |
| 575 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
Ryusuke Konishi | 7b16c8a | 2009-11-13 03:10:21 +0900 | [diff] [blame] | 576 | header = kaddr + bh_offset(header_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 577 | sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile); |
| 578 | sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
| 579 | sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs); |
Ryusuke Konishi | 2c2e52f | 2009-04-06 19:01:54 -0700 | [diff] [blame] | 580 | sustat->ss_ctime = nilfs->ns_ctime; |
| 581 | sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime; |
| 582 | spin_lock(&nilfs->ns_last_segment_lock); |
| 583 | sustat->ss_prot_seq = nilfs->ns_prot_seq; |
| 584 | spin_unlock(&nilfs->ns_last_segment_lock); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 585 | kunmap_atomic(kaddr, KM_USER0); |
| 586 | brelse(header_bh); |
| 587 | |
| 588 | out_sem: |
| 589 | up_read(&NILFS_MDT(sufile)->mi_sem); |
| 590 | return ret; |
| 591 | } |
| 592 | |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 593 | void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum, |
| 594 | struct buffer_head *header_bh, |
| 595 | struct buffer_head *su_bh) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 596 | { |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 597 | struct nilfs_segment_usage *su; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 598 | void *kaddr; |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 599 | int suclean; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 600 | |
| 601 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 602 | su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
| 603 | if (nilfs_segment_usage_error(su)) { |
| 604 | kunmap_atomic(kaddr, KM_USER0); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 605 | return; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 606 | } |
Ryusuke Konishi | 88072fa | 2009-04-05 15:03:16 +0900 | [diff] [blame] | 607 | suclean = nilfs_segment_usage_clean(su); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 608 | nilfs_segment_usage_set_error(su); |
| 609 | kunmap_atomic(kaddr, KM_USER0); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 610 | |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 611 | if (suclean) { |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 612 | nilfs_sufile_mod_counter(header_bh, -1, 0); |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 613 | NILFS_SUI(sufile)->ncleansegs--; |
| 614 | } |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 615 | mark_buffer_dirty(su_bh); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 616 | nilfs_mdt_mark_dirty(sufile); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 617 | } |
| 618 | |
| 619 | /** |
Ryusuke Konishi | 78eb64c | 2011-05-05 01:23:58 +0900 | [diff] [blame] | 620 | * nilfs_sufile_truncate_range - truncate range of segment array |
| 621 | * @sufile: inode of segment usage file |
| 622 | * @start: start segment number (inclusive) |
| 623 | * @end: end segment number (inclusive) |
| 624 | * |
| 625 | * Return Value: On success, 0 is returned. On error, one of the |
| 626 | * following negative error codes is returned. |
| 627 | * |
| 628 | * %-EIO - I/O error. |
| 629 | * |
| 630 | * %-ENOMEM - Insufficient amount of memory available. |
| 631 | * |
| 632 | * %-EINVAL - Invalid number of segments specified |
| 633 | * |
| 634 | * %-EBUSY - Dirty or active segments are present in the range |
| 635 | */ |
| 636 | static int nilfs_sufile_truncate_range(struct inode *sufile, |
| 637 | __u64 start, __u64 end) |
| 638 | { |
| 639 | struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; |
| 640 | struct buffer_head *header_bh; |
| 641 | struct buffer_head *su_bh; |
| 642 | struct nilfs_segment_usage *su, *su2; |
| 643 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
| 644 | unsigned long segusages_per_block; |
| 645 | unsigned long nsegs, ncleaned; |
| 646 | __u64 segnum; |
| 647 | void *kaddr; |
| 648 | ssize_t n, nc; |
| 649 | int ret; |
| 650 | int j; |
| 651 | |
| 652 | nsegs = nilfs_sufile_get_nsegments(sufile); |
| 653 | |
| 654 | ret = -EINVAL; |
| 655 | if (start > end || start >= nsegs) |
| 656 | goto out; |
| 657 | |
| 658 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 659 | if (ret < 0) |
| 660 | goto out; |
| 661 | |
| 662 | segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); |
| 663 | ncleaned = 0; |
| 664 | |
| 665 | for (segnum = start; segnum <= end; segnum += n) { |
| 666 | n = min_t(unsigned long, |
| 667 | segusages_per_block - |
| 668 | nilfs_sufile_get_offset(sufile, segnum), |
| 669 | end - segnum + 1); |
| 670 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, |
| 671 | &su_bh); |
| 672 | if (ret < 0) { |
| 673 | if (ret != -ENOENT) |
| 674 | goto out_header; |
| 675 | /* hole */ |
| 676 | continue; |
| 677 | } |
| 678 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 679 | su = nilfs_sufile_block_get_segment_usage( |
| 680 | sufile, segnum, su_bh, kaddr); |
| 681 | su2 = su; |
| 682 | for (j = 0; j < n; j++, su = (void *)su + susz) { |
| 683 | if ((le32_to_cpu(su->su_flags) & |
| 684 | ~(1UL << NILFS_SEGMENT_USAGE_ERROR)) || |
| 685 | nilfs_segment_is_active(nilfs, segnum + j)) { |
| 686 | ret = -EBUSY; |
| 687 | kunmap_atomic(kaddr, KM_USER0); |
| 688 | brelse(su_bh); |
| 689 | goto out_header; |
| 690 | } |
| 691 | } |
| 692 | nc = 0; |
| 693 | for (su = su2, j = 0; j < n; j++, su = (void *)su + susz) { |
| 694 | if (nilfs_segment_usage_error(su)) { |
| 695 | nilfs_segment_usage_set_clean(su); |
| 696 | nc++; |
| 697 | } |
| 698 | } |
| 699 | kunmap_atomic(kaddr, KM_USER0); |
| 700 | if (nc > 0) { |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 701 | mark_buffer_dirty(su_bh); |
Ryusuke Konishi | 78eb64c | 2011-05-05 01:23:58 +0900 | [diff] [blame] | 702 | ncleaned += nc; |
| 703 | } |
| 704 | brelse(su_bh); |
| 705 | |
| 706 | if (n == segusages_per_block) { |
| 707 | /* make hole */ |
| 708 | nilfs_sufile_delete_segment_usage_block(sufile, segnum); |
| 709 | } |
| 710 | } |
| 711 | ret = 0; |
| 712 | |
| 713 | out_header: |
| 714 | if (ncleaned > 0) { |
| 715 | NILFS_SUI(sufile)->ncleansegs += ncleaned; |
| 716 | nilfs_sufile_mod_counter(header_bh, ncleaned, 0); |
| 717 | nilfs_mdt_mark_dirty(sufile); |
| 718 | } |
| 719 | brelse(header_bh); |
| 720 | out: |
| 721 | return ret; |
| 722 | } |
| 723 | |
| 724 | /** |
Ryusuke Konishi | 4e33f9e | 2011-05-05 01:23:58 +0900 | [diff] [blame] | 725 | * nilfs_sufile_resize - resize segment array |
| 726 | * @sufile: inode of segment usage file |
| 727 | * @newnsegs: new number of segments |
| 728 | * |
| 729 | * Return Value: On success, 0 is returned. On error, one of the |
| 730 | * following negative error codes is returned. |
| 731 | * |
| 732 | * %-EIO - I/O error. |
| 733 | * |
| 734 | * %-ENOMEM - Insufficient amount of memory available. |
| 735 | * |
| 736 | * %-ENOSPC - Enough free space is not left for shrinking |
| 737 | * |
| 738 | * %-EBUSY - Dirty or active segments exist in the region to be truncated |
| 739 | */ |
| 740 | int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs) |
| 741 | { |
| 742 | struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; |
| 743 | struct buffer_head *header_bh; |
| 744 | struct nilfs_sufile_header *header; |
| 745 | struct nilfs_sufile_info *sui = NILFS_SUI(sufile); |
| 746 | void *kaddr; |
| 747 | unsigned long nsegs, nrsvsegs; |
| 748 | int ret = 0; |
| 749 | |
| 750 | down_write(&NILFS_MDT(sufile)->mi_sem); |
| 751 | |
| 752 | nsegs = nilfs_sufile_get_nsegments(sufile); |
| 753 | if (nsegs == newnsegs) |
| 754 | goto out; |
| 755 | |
| 756 | ret = -ENOSPC; |
| 757 | nrsvsegs = nilfs_nrsvsegs(nilfs, newnsegs); |
| 758 | if (newnsegs < nsegs && nsegs - newnsegs + nrsvsegs > sui->ncleansegs) |
| 759 | goto out; |
| 760 | |
| 761 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 762 | if (ret < 0) |
| 763 | goto out; |
| 764 | |
| 765 | if (newnsegs > nsegs) { |
| 766 | sui->ncleansegs += newnsegs - nsegs; |
| 767 | } else /* newnsegs < nsegs */ { |
| 768 | ret = nilfs_sufile_truncate_range(sufile, newnsegs, nsegs - 1); |
| 769 | if (ret < 0) |
| 770 | goto out_header; |
| 771 | |
| 772 | sui->ncleansegs -= nsegs - newnsegs; |
| 773 | } |
| 774 | |
| 775 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
| 776 | header = kaddr + bh_offset(header_bh); |
| 777 | header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs); |
| 778 | kunmap_atomic(kaddr, KM_USER0); |
| 779 | |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 780 | mark_buffer_dirty(header_bh); |
Ryusuke Konishi | 4e33f9e | 2011-05-05 01:23:58 +0900 | [diff] [blame] | 781 | nilfs_mdt_mark_dirty(sufile); |
| 782 | nilfs_set_nsegments(nilfs, newnsegs); |
| 783 | |
| 784 | out_header: |
| 785 | brelse(header_bh); |
| 786 | out: |
| 787 | up_write(&NILFS_MDT(sufile)->mi_sem); |
| 788 | return ret; |
| 789 | } |
| 790 | |
| 791 | /** |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 792 | * nilfs_sufile_get_suinfo - |
| 793 | * @sufile: inode of segment usage file |
| 794 | * @segnum: segment number to start looking |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 795 | * @buf: array of suinfo |
| 796 | * @sisz: byte size of suinfo |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 797 | * @nsi: size of suinfo array |
| 798 | * |
| 799 | * Description: |
| 800 | * |
| 801 | * Return Value: On success, 0 is returned and .... On error, one of the |
| 802 | * following negative error codes is returned. |
| 803 | * |
| 804 | * %-EIO - I/O error. |
| 805 | * |
| 806 | * %-ENOMEM - Insufficient amount of memory available. |
| 807 | */ |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 808 | ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf, |
| 809 | unsigned sisz, size_t nsi) |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 810 | { |
| 811 | struct buffer_head *su_bh; |
| 812 | struct nilfs_segment_usage *su; |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 813 | struct nilfs_suinfo *si = buf; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 814 | size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
Ryusuke Konishi | 0ef28f9 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 815 | struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 816 | void *kaddr; |
| 817 | unsigned long nsegs, segusages_per_block; |
| 818 | ssize_t n; |
| 819 | int ret, i, j; |
| 820 | |
| 821 | down_read(&NILFS_MDT(sufile)->mi_sem); |
| 822 | |
| 823 | segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); |
| 824 | nsegs = min_t(unsigned long, |
| 825 | nilfs_sufile_get_nsegments(sufile) - segnum, |
| 826 | nsi); |
| 827 | for (i = 0; i < nsegs; i += n, segnum += n) { |
| 828 | n = min_t(unsigned long, |
| 829 | segusages_per_block - |
| 830 | nilfs_sufile_get_offset(sufile, segnum), |
| 831 | nsegs - i); |
| 832 | ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, |
| 833 | &su_bh); |
| 834 | if (ret < 0) { |
| 835 | if (ret != -ENOENT) |
| 836 | goto out; |
| 837 | /* hole */ |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 838 | memset(si, 0, sisz * n); |
| 839 | si = (void *)si + sisz * n; |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 840 | continue; |
| 841 | } |
| 842 | |
| 843 | kaddr = kmap_atomic(su_bh->b_page, KM_USER0); |
| 844 | su = nilfs_sufile_block_get_segment_usage( |
| 845 | sufile, segnum, su_bh, kaddr); |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 846 | for (j = 0; j < n; |
| 847 | j++, su = (void *)su + susz, si = (void *)si + sisz) { |
| 848 | si->sui_lastmod = le64_to_cpu(su->su_lastmod); |
| 849 | si->sui_nblocks = le32_to_cpu(su->su_nblocks); |
| 850 | si->sui_flags = le32_to_cpu(su->su_flags) & |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 851 | ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
Ryusuke Konishi | 3efb55b4 | 2009-03-30 00:50:19 +0900 | [diff] [blame] | 852 | if (nilfs_segment_is_active(nilfs, segnum + j)) |
Ryusuke Konishi | 003ff18 | 2009-05-12 03:58:47 +0900 | [diff] [blame] | 853 | si->sui_flags |= |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 854 | (1UL << NILFS_SEGMENT_USAGE_ACTIVE); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 855 | } |
| 856 | kunmap_atomic(kaddr, KM_USER0); |
| 857 | brelse(su_bh); |
| 858 | } |
| 859 | ret = nsegs; |
| 860 | |
| 861 | out: |
| 862 | up_read(&NILFS_MDT(sufile)->mi_sem); |
| 863 | return ret; |
| 864 | } |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 865 | |
| 866 | /** |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 867 | * nilfs_sufile_read - read or get sufile inode |
| 868 | * @sb: super block instance |
| 869 | * @susize: size of a segment usage entry |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 870 | * @raw_inode: on-disk sufile inode |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 871 | * @inodep: buffer to store the inode |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 872 | */ |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 873 | int nilfs_sufile_read(struct super_block *sb, size_t susize, |
| 874 | struct nilfs_inode *raw_inode, struct inode **inodep) |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 875 | { |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 876 | struct inode *sufile; |
| 877 | struct nilfs_sufile_info *sui; |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 878 | struct buffer_head *header_bh; |
| 879 | struct nilfs_sufile_header *header; |
| 880 | void *kaddr; |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 881 | int err; |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 882 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 883 | sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO); |
| 884 | if (unlikely(!sufile)) |
| 885 | return -ENOMEM; |
| 886 | if (!(sufile->i_state & I_NEW)) |
| 887 | goto out; |
Ryusuke Konishi | aa474a2 | 2009-11-13 03:41:55 +0900 | [diff] [blame] | 888 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 889 | err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui)); |
| 890 | if (err) |
| 891 | goto failed; |
Ryusuke Konishi | 8707df3 | 2009-11-13 01:36:56 +0900 | [diff] [blame] | 892 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 893 | nilfs_mdt_set_entry_size(sufile, susize, |
| 894 | sizeof(struct nilfs_sufile_header)); |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 895 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 896 | err = nilfs_read_inode_common(sufile, raw_inode); |
| 897 | if (err) |
| 898 | goto failed; |
| 899 | |
| 900 | err = nilfs_sufile_get_header_block(sufile, &header_bh); |
| 901 | if (err) |
| 902 | goto failed; |
| 903 | |
| 904 | sui = NILFS_SUI(sufile); |
| 905 | kaddr = kmap_atomic(header_bh->b_page, KM_USER0); |
| 906 | header = kaddr + bh_offset(header_bh); |
| 907 | sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
| 908 | kunmap_atomic(kaddr, KM_USER0); |
| 909 | brelse(header_bh); |
| 910 | |
Ryusuke Konishi | 619205d | 2011-05-05 01:23:57 +0900 | [diff] [blame] | 911 | sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1; |
| 912 | sui->allocmin = 0; |
| 913 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 914 | unlock_new_inode(sufile); |
| 915 | out: |
| 916 | *inodep = sufile; |
| 917 | return 0; |
| 918 | failed: |
| 919 | iget_failed(sufile); |
| 920 | return err; |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 921 | } |