Ryusuke Konishi | ae98043 | 2018-09-04 15:46:30 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 2 | /* |
| 3 | * mdt.c - meta data file for NILFS |
| 4 | * |
| 5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
| 6 | * |
Ryusuke Konishi | 4b420ab | 2016-05-23 16:23:09 -0700 | [diff] [blame] | 7 | * Written by Ryusuke Konishi. |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/buffer_head.h> |
| 11 | #include <linux/mpage.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/writeback.h> |
| 14 | #include <linux/backing-dev.h> |
| 15 | #include <linux/swap.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 17 | #include "nilfs.h" |
Ryusuke Konishi | 05d0e94 | 2010-07-10 20:52:09 +0900 | [diff] [blame] | 18 | #include "btnode.h" |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 19 | #include "segment.h" |
| 20 | #include "page.h" |
| 21 | #include "mdt.h" |
Ryusuke Konishi | 2d19961 | 2016-05-23 16:23:20 -0700 | [diff] [blame] | 22 | #include "alloc.h" /* nilfs_palloc_destroy_cache() */ |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 23 | |
Hitoshi Mitake | a9cd207 | 2015-11-06 16:32:08 -0800 | [diff] [blame] | 24 | #include <trace/events/nilfs2.h> |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 25 | |
| 26 | #define NILFS_MDT_MAX_RA_BLOCKS (16 - 1) |
| 27 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 28 | |
| 29 | static int |
| 30 | nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block, |
| 31 | struct buffer_head *bh, |
| 32 | void (*init_block)(struct inode *, |
| 33 | struct buffer_head *, void *)) |
| 34 | { |
| 35 | struct nilfs_inode_info *ii = NILFS_I(inode); |
| 36 | void *kaddr; |
| 37 | int ret; |
| 38 | |
| 39 | /* Caller exclude read accesses using page lock */ |
| 40 | |
| 41 | /* set_buffer_new(bh); */ |
| 42 | bh->b_blocknr = 0; |
| 43 | |
| 44 | ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh); |
| 45 | if (unlikely(ret)) |
| 46 | return ret; |
| 47 | |
| 48 | set_buffer_mapped(bh); |
| 49 | |
Cong Wang | 7b9c097 | 2011-11-25 23:14:33 +0800 | [diff] [blame] | 50 | kaddr = kmap_atomic(bh->b_page); |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 51 | memset(kaddr + bh_offset(bh), 0, i_blocksize(inode)); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 52 | if (init_block) |
| 53 | init_block(inode, bh, kaddr); |
| 54 | flush_dcache_page(bh->b_page); |
Cong Wang | 7b9c097 | 2011-11-25 23:14:33 +0800 | [diff] [blame] | 55 | kunmap_atomic(kaddr); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 56 | |
| 57 | set_buffer_uptodate(bh); |
Ryusuke Konishi | 5fc7b14 | 2011-05-05 12:56:51 +0900 | [diff] [blame] | 58 | mark_buffer_dirty(bh); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 59 | nilfs_mdt_mark_dirty(inode); |
Hitoshi Mitake | a9cd207 | 2015-11-06 16:32:08 -0800 | [diff] [blame] | 60 | |
| 61 | trace_nilfs2_mdt_insert_new_block(inode, inode->i_ino, block); |
| 62 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static int nilfs_mdt_create_block(struct inode *inode, unsigned long block, |
| 67 | struct buffer_head **out_bh, |
| 68 | void (*init_block)(struct inode *, |
| 69 | struct buffer_head *, |
| 70 | void *)) |
| 71 | { |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 72 | struct super_block *sb = inode->i_sb; |
| 73 | struct nilfs_transaction_info ti; |
| 74 | struct buffer_head *bh; |
| 75 | int err; |
| 76 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 77 | nilfs_transaction_begin(sb, &ti, 0); |
| 78 | |
| 79 | err = -ENOMEM; |
| 80 | bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0); |
| 81 | if (unlikely(!bh)) |
| 82 | goto failed_unlock; |
| 83 | |
| 84 | err = -EEXIST; |
Ryusuke Konishi | 1435110 | 2009-09-06 17:49:49 +0900 | [diff] [blame] | 85 | if (buffer_uptodate(bh)) |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 86 | goto failed_bh; |
Ryusuke Konishi | 1435110 | 2009-09-06 17:49:49 +0900 | [diff] [blame] | 87 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 88 | wait_on_buffer(bh); |
| 89 | if (buffer_uptodate(bh)) |
| 90 | goto failed_bh; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 91 | |
Ryusuke Konishi | 090fd5b | 2010-09-05 16:17:35 +0900 | [diff] [blame] | 92 | bh->b_bdev = sb->s_bdev; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 93 | err = nilfs_mdt_insert_new_block(inode, block, bh, init_block); |
| 94 | if (likely(!err)) { |
| 95 | get_bh(bh); |
| 96 | *out_bh = bh; |
| 97 | } |
| 98 | |
| 99 | failed_bh: |
| 100 | unlock_page(bh->b_page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 101 | put_page(bh->b_page); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 102 | brelse(bh); |
| 103 | |
| 104 | failed_unlock: |
Ryusuke Konishi | 47420c7 | 2009-04-06 19:01:45 -0700 | [diff] [blame] | 105 | if (likely(!err)) |
| 106 | err = nilfs_transaction_commit(sb); |
| 107 | else |
| 108 | nilfs_transaction_abort(sb); |
Ryusuke Konishi | 090fd5b | 2010-09-05 16:17:35 +0900 | [diff] [blame] | 109 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 110 | return err; |
| 111 | } |
| 112 | |
| 113 | static int |
| 114 | nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff, |
Mike Christie | 2a222ca | 2016-06-05 14:31:43 -0500 | [diff] [blame] | 115 | int mode, int mode_flags, struct buffer_head **out_bh) |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 116 | { |
| 117 | struct buffer_head *bh; |
Ryusuke Konishi | 0f3fe33 | 2009-08-15 02:29:28 +0900 | [diff] [blame] | 118 | __u64 blknum = 0; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 119 | int ret = -ENOMEM; |
| 120 | |
| 121 | bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0); |
| 122 | if (unlikely(!bh)) |
| 123 | goto failed; |
| 124 | |
| 125 | ret = -EEXIST; /* internal code */ |
| 126 | if (buffer_uptodate(bh)) |
| 127 | goto out; |
| 128 | |
Mike Christie | 2a222ca | 2016-06-05 14:31:43 -0500 | [diff] [blame] | 129 | if (mode_flags & REQ_RAHEAD) { |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 130 | if (!trylock_buffer(bh)) { |
| 131 | ret = -EBUSY; |
| 132 | goto failed_bh; |
| 133 | } |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 134 | } else /* mode == READ */ |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 135 | lock_buffer(bh); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 136 | |
| 137 | if (buffer_uptodate(bh)) { |
| 138 | unlock_buffer(bh); |
| 139 | goto out; |
| 140 | } |
Ryusuke Konishi | 1435110 | 2009-09-06 17:49:49 +0900 | [diff] [blame] | 141 | |
| 142 | ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum); |
| 143 | if (unlikely(ret)) { |
| 144 | unlock_buffer(bh); |
| 145 | goto failed_bh; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 146 | } |
Ryusuke Konishi | c6e0718 | 2010-09-05 00:23:50 +0900 | [diff] [blame] | 147 | map_bh(bh, inode->i_sb, (sector_t)blknum); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 148 | |
| 149 | bh->b_end_io = end_buffer_read_sync; |
| 150 | get_bh(bh); |
Mike Christie | 2a222ca | 2016-06-05 14:31:43 -0500 | [diff] [blame] | 151 | submit_bh(mode, mode_flags, bh); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 152 | ret = 0; |
Hitoshi Mitake | a9cd207 | 2015-11-06 16:32:08 -0800 | [diff] [blame] | 153 | |
| 154 | trace_nilfs2_mdt_submit_block(inode, inode->i_ino, blkoff, mode); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 155 | out: |
| 156 | get_bh(bh); |
| 157 | *out_bh = bh; |
| 158 | |
| 159 | failed_bh: |
| 160 | unlock_page(bh->b_page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 161 | put_page(bh->b_page); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 162 | brelse(bh); |
| 163 | failed: |
| 164 | return ret; |
| 165 | } |
| 166 | |
| 167 | static int nilfs_mdt_read_block(struct inode *inode, unsigned long block, |
Ryusuke Konishi | b34a650 | 2009-11-14 00:09:47 +0900 | [diff] [blame] | 168 | int readahead, struct buffer_head **out_bh) |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 169 | { |
| 170 | struct buffer_head *first_bh, *bh; |
| 171 | unsigned long blkoff; |
| 172 | int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS; |
| 173 | int err; |
| 174 | |
Mike Christie | 2a222ca | 2016-06-05 14:31:43 -0500 | [diff] [blame] | 175 | err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, 0, &first_bh); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 176 | if (err == -EEXIST) /* internal code */ |
| 177 | goto out; |
| 178 | |
| 179 | if (unlikely(err)) |
| 180 | goto failed; |
| 181 | |
Ryusuke Konishi | b34a650 | 2009-11-14 00:09:47 +0900 | [diff] [blame] | 182 | if (readahead) { |
| 183 | blkoff = block + 1; |
| 184 | for (i = 0; i < nr_ra_blocks; i++, blkoff++) { |
Mike Christie | 2a222ca | 2016-06-05 14:31:43 -0500 | [diff] [blame] | 185 | err = nilfs_mdt_submit_block(inode, blkoff, REQ_OP_READ, |
| 186 | REQ_RAHEAD, &bh); |
Ryusuke Konishi | b34a650 | 2009-11-14 00:09:47 +0900 | [diff] [blame] | 187 | if (likely(!err || err == -EEXIST)) |
| 188 | brelse(bh); |
| 189 | else if (err != -EBUSY) |
| 190 | break; |
| 191 | /* abort readahead if bmap lookup failed */ |
| 192 | if (!buffer_locked(first_bh)) |
| 193 | goto out_no_wait; |
| 194 | } |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | wait_on_buffer(first_bh); |
| 198 | |
| 199 | out_no_wait: |
| 200 | err = -EIO; |
Ryusuke Konishi | 39a9dcc | 2016-08-02 14:05:17 -0700 | [diff] [blame] | 201 | if (!buffer_uptodate(first_bh)) { |
| 202 | nilfs_msg(inode->i_sb, KERN_ERR, |
| 203 | "I/O error reading meta-data file (ino=%lu, block-offset=%lu)", |
| 204 | inode->i_ino, block); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 205 | goto failed_bh; |
Ryusuke Konishi | 39a9dcc | 2016-08-02 14:05:17 -0700 | [diff] [blame] | 206 | } |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 207 | out: |
| 208 | *out_bh = first_bh; |
| 209 | return 0; |
| 210 | |
| 211 | failed_bh: |
| 212 | brelse(first_bh); |
| 213 | failed: |
| 214 | return err; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * nilfs_mdt_get_block - read or create a buffer on meta data file. |
| 219 | * @inode: inode of the meta data file |
| 220 | * @blkoff: block offset |
| 221 | * @create: create flag |
| 222 | * @init_block: initializer used for newly allocated block |
| 223 | * @out_bh: output of a pointer to the buffer_head |
| 224 | * |
| 225 | * nilfs_mdt_get_block() looks up the specified buffer and tries to create |
| 226 | * a new buffer if @create is not zero. On success, the returned buffer is |
| 227 | * assured to be either existing or formatted using a buffer lock on success. |
| 228 | * @out_bh is substituted only when zero is returned. |
| 229 | * |
| 230 | * Return Value: On success, it returns 0. On error, the following negative |
| 231 | * error code is returned. |
| 232 | * |
| 233 | * %-ENOMEM - Insufficient memory available. |
| 234 | * |
| 235 | * %-EIO - I/O error |
| 236 | * |
| 237 | * %-ENOENT - the specified block does not exist (hole block) |
| 238 | * |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 239 | * %-EROFS - Read only filesystem (for create mode) |
| 240 | */ |
| 241 | int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create, |
| 242 | void (*init_block)(struct inode *, |
| 243 | struct buffer_head *, void *), |
| 244 | struct buffer_head **out_bh) |
| 245 | { |
| 246 | int ret; |
| 247 | |
| 248 | /* Should be rewritten with merging nilfs_mdt_read_block() */ |
| 249 | retry: |
Ryusuke Konishi | b34a650 | 2009-11-14 00:09:47 +0900 | [diff] [blame] | 250 | ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 251 | if (!create || ret != -ENOENT) |
| 252 | return ret; |
| 253 | |
| 254 | ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block); |
| 255 | if (unlikely(ret == -EEXIST)) { |
| 256 | /* create = 0; */ /* limit read-create loop retries */ |
| 257 | goto retry; |
| 258 | } |
| 259 | return ret; |
| 260 | } |
| 261 | |
| 262 | /** |
Ryusuke Konishi | fa33915 | 2015-04-16 12:46:39 -0700 | [diff] [blame] | 263 | * nilfs_mdt_find_block - find and get a buffer on meta data file. |
| 264 | * @inode: inode of the meta data file |
| 265 | * @start: start block offset (inclusive) |
| 266 | * @end: end block offset (inclusive) |
| 267 | * @blkoff: block offset |
| 268 | * @out_bh: place to store a pointer to buffer_head struct |
| 269 | * |
| 270 | * nilfs_mdt_find_block() looks up an existing block in range of |
| 271 | * [@start, @end] and stores pointer to a buffer head of the block to |
| 272 | * @out_bh, and block offset to @blkoff, respectively. @out_bh and |
| 273 | * @blkoff are substituted only when zero is returned. |
| 274 | * |
| 275 | * Return Value: On success, it returns 0. On error, the following negative |
| 276 | * error code is returned. |
| 277 | * |
| 278 | * %-ENOMEM - Insufficient memory available. |
| 279 | * |
| 280 | * %-EIO - I/O error |
| 281 | * |
| 282 | * %-ENOENT - no block was found in the range |
| 283 | */ |
| 284 | int nilfs_mdt_find_block(struct inode *inode, unsigned long start, |
| 285 | unsigned long end, unsigned long *blkoff, |
| 286 | struct buffer_head **out_bh) |
| 287 | { |
| 288 | __u64 next; |
| 289 | int ret; |
| 290 | |
| 291 | if (unlikely(start > end)) |
| 292 | return -ENOENT; |
| 293 | |
| 294 | ret = nilfs_mdt_read_block(inode, start, true, out_bh); |
| 295 | if (!ret) { |
| 296 | *blkoff = start; |
| 297 | goto out; |
| 298 | } |
| 299 | if (unlikely(ret != -ENOENT || start == ULONG_MAX)) |
| 300 | goto out; |
| 301 | |
| 302 | ret = nilfs_bmap_seek_key(NILFS_I(inode)->i_bmap, start + 1, &next); |
| 303 | if (!ret) { |
| 304 | if (next <= end) { |
| 305 | ret = nilfs_mdt_read_block(inode, next, true, out_bh); |
| 306 | if (!ret) |
| 307 | *blkoff = next; |
| 308 | } else { |
| 309 | ret = -ENOENT; |
| 310 | } |
| 311 | } |
| 312 | out: |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | /** |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 317 | * nilfs_mdt_delete_block - make a hole on the meta data file. |
| 318 | * @inode: inode of the meta data file |
| 319 | * @block: block offset |
| 320 | * |
| 321 | * Return Value: On success, zero is returned. |
| 322 | * On error, one of the following negative error code is returned. |
| 323 | * |
| 324 | * %-ENOMEM - Insufficient memory available. |
| 325 | * |
| 326 | * %-EIO - I/O error |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 327 | */ |
| 328 | int nilfs_mdt_delete_block(struct inode *inode, unsigned long block) |
| 329 | { |
| 330 | struct nilfs_inode_info *ii = NILFS_I(inode); |
| 331 | int err; |
| 332 | |
| 333 | err = nilfs_bmap_delete(ii->i_bmap, block); |
Ryusuke Konishi | 8433823 | 2009-05-05 21:52:06 +0900 | [diff] [blame] | 334 | if (!err || err == -ENOENT) { |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 335 | nilfs_mdt_mark_dirty(inode); |
| 336 | nilfs_mdt_forget_block(inode, block); |
| 337 | } |
| 338 | return err; |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * nilfs_mdt_forget_block - discard dirty state and try to remove the page |
| 343 | * @inode: inode of the meta data file |
| 344 | * @block: block offset |
| 345 | * |
| 346 | * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and |
| 347 | * tries to release the page including the buffer from a page cache. |
| 348 | * |
| 349 | * Return Value: On success, 0 is returned. On error, one of the following |
| 350 | * negative error code is returned. |
| 351 | * |
| 352 | * %-EBUSY - page has an active buffer. |
| 353 | * |
| 354 | * %-ENOENT - page cache has no page addressed by the offset. |
| 355 | */ |
| 356 | int nilfs_mdt_forget_block(struct inode *inode, unsigned long block) |
| 357 | { |
| 358 | pgoff_t index = (pgoff_t)block >> |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 359 | (PAGE_SHIFT - inode->i_blkbits); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 360 | struct page *page; |
| 361 | unsigned long first_block; |
| 362 | int ret = 0; |
| 363 | int still_dirty; |
| 364 | |
| 365 | page = find_lock_page(inode->i_mapping, index); |
| 366 | if (!page) |
| 367 | return -ENOENT; |
| 368 | |
| 369 | wait_on_page_writeback(page); |
| 370 | |
| 371 | first_block = (unsigned long)index << |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 372 | (PAGE_SHIFT - inode->i_blkbits); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 373 | if (page_has_buffers(page)) { |
| 374 | struct buffer_head *bh; |
| 375 | |
| 376 | bh = nilfs_page_get_nth_block(page, block - first_block); |
| 377 | nilfs_forget_buffer(bh); |
| 378 | } |
| 379 | still_dirty = PageDirty(page); |
| 380 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 381 | put_page(page); |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 382 | |
| 383 | if (still_dirty || |
| 384 | invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0) |
| 385 | ret = -EBUSY; |
| 386 | return ret; |
| 387 | } |
| 388 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 389 | int nilfs_mdt_fetch_dirty(struct inode *inode) |
| 390 | { |
| 391 | struct nilfs_inode_info *ii = NILFS_I(inode); |
| 392 | |
| 393 | if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) { |
| 394 | set_bit(NILFS_I_DIRTY, &ii->i_state); |
| 395 | return 1; |
| 396 | } |
| 397 | return test_bit(NILFS_I_DIRTY, &ii->i_state); |
| 398 | } |
| 399 | |
| 400 | static int |
| 401 | nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc) |
| 402 | { |
Vyacheslav Dubeyko | 8c26c4e | 2013-04-30 15:27:48 -0700 | [diff] [blame] | 403 | struct inode *inode = page->mapping->host; |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 404 | struct super_block *sb; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 405 | int err = 0; |
| 406 | |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 407 | if (inode && sb_rdonly(inode->i_sb)) { |
Vyacheslav Dubeyko | 8c26c4e | 2013-04-30 15:27:48 -0700 | [diff] [blame] | 408 | /* |
| 409 | * It means that filesystem was remounted in read-only |
| 410 | * mode because of error or metadata corruption. But we |
| 411 | * have dirty pages that try to be flushed in background. |
| 412 | * So, here we simply discard this dirty page. |
| 413 | */ |
| 414 | nilfs_clear_dirty_page(page, false); |
| 415 | unlock_page(page); |
| 416 | return -EROFS; |
| 417 | } |
| 418 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 419 | redirty_page_for_writepage(wbc, page); |
| 420 | unlock_page(page); |
| 421 | |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 422 | if (!inode) |
| 423 | return 0; |
| 424 | |
| 425 | sb = inode->i_sb; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 426 | |
| 427 | if (wbc->sync_mode == WB_SYNC_ALL) |
| 428 | err = nilfs_construct_segment(sb); |
| 429 | else if (wbc->for_reclaim) |
| 430 | nilfs_flush_segment(sb, inode->i_ino); |
| 431 | |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 432 | return err; |
| 433 | } |
| 434 | |
| 435 | |
Alexey Dobriyan | 7f09410 | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 436 | static const struct address_space_operations def_mdt_aops = { |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 437 | .writepage = nilfs_mdt_write_page, |
| 438 | }; |
| 439 | |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 440 | static const struct inode_operations def_mdt_iops; |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 441 | static const struct file_operations def_mdt_fops; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 442 | |
Ryusuke Konishi | 5e19a99 | 2010-08-21 22:01:51 +0900 | [diff] [blame] | 443 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 444 | int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz) |
Ryusuke Konishi | 5e19a99 | 2010-08-21 22:01:51 +0900 | [diff] [blame] | 445 | { |
| 446 | struct nilfs_mdt_info *mi; |
| 447 | |
| 448 | mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS); |
| 449 | if (!mi) |
| 450 | return -ENOMEM; |
| 451 | |
Ryusuke Konishi | 5e19a99 | 2010-08-21 22:01:51 +0900 | [diff] [blame] | 452 | init_rwsem(&mi->mi_sem); |
| 453 | inode->i_private = mi; |
| 454 | |
| 455 | inode->i_mode = S_IFREG; |
| 456 | mapping_set_gfp_mask(inode->i_mapping, gfp_mask); |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 457 | |
| 458 | inode->i_op = &def_mdt_iops; |
| 459 | inode->i_fop = &def_mdt_fops; |
| 460 | inode->i_mapping->a_ops = &def_mdt_aops; |
Ryusuke Konishi | 5e19a99 | 2010-08-21 22:01:51 +0900 | [diff] [blame] | 461 | |
| 462 | return 0; |
| 463 | } |
| 464 | |
Ryusuke Konishi | 2d19961 | 2016-05-23 16:23:20 -0700 | [diff] [blame] | 465 | /** |
| 466 | * nilfs_mdt_clear - do cleanup for the metadata file |
| 467 | * @inode: inode of the metadata file |
| 468 | */ |
| 469 | void nilfs_mdt_clear(struct inode *inode) |
| 470 | { |
| 471 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
| 472 | |
| 473 | if (mdi->mi_palloc_cache) |
| 474 | nilfs_palloc_destroy_cache(inode); |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * nilfs_mdt_destroy - release resources used by the metadata file |
| 479 | * @inode: inode of the metadata file |
| 480 | */ |
| 481 | void nilfs_mdt_destroy(struct inode *inode) |
| 482 | { |
| 483 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
| 484 | |
| 485 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ |
| 486 | kfree(mdi); |
| 487 | } |
| 488 | |
Ryusuke Konishi | 0c6c44c | 2016-05-23 16:23:39 -0700 | [diff] [blame] | 489 | void nilfs_mdt_set_entry_size(struct inode *inode, unsigned int entry_size, |
| 490 | unsigned int header_size) |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 491 | { |
| 492 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); |
| 493 | |
| 494 | mi->mi_entry_size = entry_size; |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 495 | mi->mi_entries_per_block = i_blocksize(inode) / entry_size; |
Ryusuke Konishi | 5eb563f | 2009-04-06 19:01:28 -0700 | [diff] [blame] | 496 | mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size); |
| 497 | } |
| 498 | |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 499 | /** |
| 500 | * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file |
| 501 | * @inode: inode of the metadata file |
| 502 | * @shadow: shadow mapping |
| 503 | */ |
| 504 | int nilfs_mdt_setup_shadow_map(struct inode *inode, |
| 505 | struct nilfs_shadow_map *shadow) |
| 506 | { |
| 507 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 508 | |
| 509 | INIT_LIST_HEAD(&shadow->frozen_buffers); |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 510 | address_space_init_once(&shadow->frozen_data); |
Christoph Hellwig | b83ae6d | 2015-01-14 10:42:37 +0100 | [diff] [blame] | 511 | nilfs_mapping_init(&shadow->frozen_data, inode); |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 512 | address_space_init_once(&shadow->frozen_btnodes); |
Christoph Hellwig | b83ae6d | 2015-01-14 10:42:37 +0100 | [diff] [blame] | 513 | nilfs_mapping_init(&shadow->frozen_btnodes, inode); |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 514 | mi->mi_shadow = shadow; |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map |
| 520 | * @inode: inode of the metadata file |
| 521 | */ |
| 522 | int nilfs_mdt_save_to_shadow_map(struct inode *inode) |
| 523 | { |
| 524 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); |
| 525 | struct nilfs_inode_info *ii = NILFS_I(inode); |
| 526 | struct nilfs_shadow_map *shadow = mi->mi_shadow; |
| 527 | int ret; |
| 528 | |
| 529 | ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping); |
| 530 | if (ret) |
| 531 | goto out; |
| 532 | |
| 533 | ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes, |
| 534 | &ii->i_btnode_cache); |
| 535 | if (ret) |
| 536 | goto out; |
| 537 | |
| 538 | nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store); |
| 539 | out: |
| 540 | return ret; |
| 541 | } |
| 542 | |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 543 | int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh) |
| 544 | { |
| 545 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; |
| 546 | struct buffer_head *bh_frozen; |
| 547 | struct page *page; |
| 548 | int blkbits = inode->i_blkbits; |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 549 | |
| 550 | page = grab_cache_page(&shadow->frozen_data, bh->b_page->index); |
| 551 | if (!page) |
Ryusuke Konishi | a7a8447 | 2010-12-27 00:03:02 +0900 | [diff] [blame] | 552 | return -ENOMEM; |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 553 | |
| 554 | if (!page_has_buffers(page)) |
| 555 | create_empty_buffers(page, 1 << blkbits, 0); |
| 556 | |
| 557 | bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits); |
Ryusuke Konishi | a7a8447 | 2010-12-27 00:03:02 +0900 | [diff] [blame] | 558 | |
| 559 | if (!buffer_uptodate(bh_frozen)) |
| 560 | nilfs_copy_buffer(bh_frozen, bh); |
| 561 | if (list_empty(&bh_frozen->b_assoc_buffers)) { |
| 562 | list_add_tail(&bh_frozen->b_assoc_buffers, |
| 563 | &shadow->frozen_buffers); |
| 564 | set_buffer_nilfs_redirected(bh); |
| 565 | } else { |
| 566 | brelse(bh_frozen); /* already frozen */ |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 567 | } |
Ryusuke Konishi | a7a8447 | 2010-12-27 00:03:02 +0900 | [diff] [blame] | 568 | |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 569 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 570 | put_page(page); |
Ryusuke Konishi | a7a8447 | 2010-12-27 00:03:02 +0900 | [diff] [blame] | 571 | return 0; |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | struct buffer_head * |
| 575 | nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh) |
| 576 | { |
| 577 | struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; |
| 578 | struct buffer_head *bh_frozen = NULL; |
| 579 | struct page *page; |
| 580 | int n; |
| 581 | |
| 582 | page = find_lock_page(&shadow->frozen_data, bh->b_page->index); |
| 583 | if (page) { |
| 584 | if (page_has_buffers(page)) { |
| 585 | n = bh_offset(bh) >> inode->i_blkbits; |
| 586 | bh_frozen = nilfs_page_get_nth_block(page, n); |
| 587 | } |
| 588 | unlock_page(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 589 | put_page(page); |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 590 | } |
| 591 | return bh_frozen; |
| 592 | } |
| 593 | |
| 594 | static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow) |
| 595 | { |
| 596 | struct list_head *head = &shadow->frozen_buffers; |
| 597 | struct buffer_head *bh; |
| 598 | |
| 599 | while (!list_empty(head)) { |
| 600 | bh = list_first_entry(head, struct buffer_head, |
| 601 | b_assoc_buffers); |
| 602 | list_del_init(&bh->b_assoc_buffers); |
| 603 | brelse(bh); /* drop ref-count to make it releasable */ |
| 604 | } |
| 605 | } |
| 606 | |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 607 | /** |
| 608 | * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state |
| 609 | * @inode: inode of the metadata file |
| 610 | */ |
| 611 | void nilfs_mdt_restore_from_shadow_map(struct inode *inode) |
| 612 | { |
| 613 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); |
| 614 | struct nilfs_inode_info *ii = NILFS_I(inode); |
| 615 | struct nilfs_shadow_map *shadow = mi->mi_shadow; |
| 616 | |
| 617 | down_write(&mi->mi_sem); |
| 618 | |
| 619 | if (mi->mi_palloc_cache) |
| 620 | nilfs_palloc_clear_cache(inode); |
| 621 | |
Vyacheslav Dubeyko | 8c26c4e | 2013-04-30 15:27:48 -0700 | [diff] [blame] | 622 | nilfs_clear_dirty_pages(inode->i_mapping, true); |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 623 | nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data); |
| 624 | |
Vyacheslav Dubeyko | 8c26c4e | 2013-04-30 15:27:48 -0700 | [diff] [blame] | 625 | nilfs_clear_dirty_pages(&ii->i_btnode_cache, true); |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 626 | nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes); |
| 627 | |
| 628 | nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store); |
| 629 | |
| 630 | up_write(&mi->mi_sem); |
| 631 | } |
| 632 | |
| 633 | /** |
| 634 | * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches |
| 635 | * @inode: inode of the metadata file |
| 636 | */ |
| 637 | void nilfs_mdt_clear_shadow_map(struct inode *inode) |
| 638 | { |
| 639 | struct nilfs_mdt_info *mi = NILFS_MDT(inode); |
| 640 | struct nilfs_shadow_map *shadow = mi->mi_shadow; |
| 641 | |
| 642 | down_write(&mi->mi_sem); |
Ryusuke Konishi | b1f6a4f | 2010-08-31 11:40:34 +0900 | [diff] [blame] | 643 | nilfs_release_frozen_buffers(shadow); |
Ryusuke Konishi | ebdfed4 | 2010-09-06 12:05:43 +0900 | [diff] [blame] | 644 | truncate_inode_pages(&shadow->frozen_data, 0); |
| 645 | truncate_inode_pages(&shadow->frozen_btnodes, 0); |
| 646 | up_write(&mi->mi_sem); |
| 647 | } |