| 1 | |
| 2 | * linux/fs/jbd2/commit.c
|
| 3 | *
|
| 4 | * Written by Stephen C. Tweedie <[email protected]>, 1998
|
| 5 | *
|
| 6 | * Copyright 1998 Red Hat corp --- All Rights Reserved
|
| 7 | *
|
| 8 | * This file is part of the Linux kernel and is made available under
|
| 9 | * the terms of the GNU General Public License, version 2, or at your
|
| 10 | * option, any later version, incorporated herein by reference.
|
| 11 | *
|
| 12 | * Journal commit routines for the generic filesystem journaling code;
|
| 13 | * part of the ext2fs journaling system.
|
| 14 |
|
| 15 |
|
| 16 | #include <linux/time.h>
|
| 17 | #include <linux/fs.h>
|
| 18 | #include <linux/jbd2.h>
|
| 19 | #include <linux/errno.h>
|
| 20 | #include <linux/slab.h>
|
| 21 | #include <linux/mm.h>
|
| 22 | #include <linux/pagemap.h>
|
| 23 | #include <linux/jiffies.h>
|
| 24 | #include <linux/crc32.h>
|
| 25 | #include <linux/writeback.h>
|
| 26 | #include <linux/backing-dev.h>
|
| 27 | #include <linux/bio.h>
|
| 28 | #include <linux/blkdev.h>
|
| 29 | #include <linux/bitops.h>
|
| 30 | #include <trace/events/jbd2.h>
|
| 31 |
|
| 32 | |
| 33 | * IO end handler for temporary buffer_heads handling writes to the journal.
|
| 34 |
|
| 35 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
|
| 36 | {
|
| 37 | struct buffer_head *orig_bh = bh->b_private;
|
| 38 |
|
| 39 | BUFFER_TRACE(bh, "");
|
| 40 | if (uptodate)
|
| 41 | set_buffer_uptodate(bh);
|
| 42 | else
|
| 43 | clear_buffer_uptodate(bh);
|
| 44 | if (orig_bh) {
|
| 45 | clear_bit_unlock(BH_Shadow, &orig_bh->b_state);
|
| 46 | smp_mb__after_clear_bit();
|
| 47 | wake_up_bit(&orig_bh->b_state, BH_Shadow);
|
| 48 | }
|
| 49 | unlock_buffer(bh);
|
| 50 | }
|
| 51 |
|
| 52 | |
| 53 | * When an ext4 file is truncated, it is possible that some pages are not
|
| 54 | * successfully freed, because they are attached to a committing transaction.
|
| 55 | * After the transaction commits, these pages are left on the LRU, with no
|
| 56 | * ->mapping, and with attached buffers. These pages are trivially reclaimable
|
| 57 | * by the VM, but their apparent absence upsets the VM accounting, and it makes
|
| 58 | * the numbers in /proc/meminfo look odd.
|
| 59 | *
|
| 60 | * So here, we have a buffer which has just come off the forget list. Look to
|
| 61 | * see if we can strip all buffers from the backing page.
|
| 62 | *
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| 63 | * Called under lock_journal(), and possibly under journal_datalist_lock. The
|
| 64 | * caller provided us with a ref against the buffer, and we drop that here.
|
| 65 |
|
| 66 | static void release_buffer_page(struct buffer_head *bh)
|
| 67 | {
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| 68 | struct page *page;
|
| 69 |
|
| 70 | if (buffer_dirty(bh))
|
| 71 | goto nope;
|
| 72 | if (atomic_read(&bh->b_count) != 1)
|
| 73 | goto nope;
|
| 74 | page = bh->b_page;
|
| 75 | if (!page)
|
| 76 | goto nope;
|
| 77 | if (page->mapping)
|
| 78 | goto nope;
|
| 79 |
|
| 80 |
|
| 81 | if (!trylock_page(page))
|
| 82 | goto nope;
|
| 83 |
|
| 84 | page_cache_get(page);
|
| 85 | __brelse(bh);
|
| 86 | try_to_free_buffers(page);
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| 87 | unlock_page(page);
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| 88 | page_cache_release(page);
|
| 89 | return;
|
| 90 |
|
| 91 | nope:
|
| 92 | __brelse(bh);
|
| 93 | }
|
| 94 |
|
| 95 | static void jbd2_commit_block_csum_set(journal_t *j, struct buffer_head *bh)
|
| 96 | {
|
| 97 | struct commit_header *h;
|
| 98 | __u32 csum;
|
| 99 |
|
| 100 | if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
|
| 101 | return;
|
| 102 |
|
| 103 | h = (struct commit_header *)(bh->b_data);
|
| 104 | h->h_chksum_type = 0;
|
| 105 | h->h_chksum_size = 0;
|
| 106 | h->h_chksum[0] = 0;
|
| 107 | csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
|
| 108 | h->h_chksum[0] = cpu_to_be32(csum);
|
| 109 | }
|
| 110 |
|
| 111 | |
| 112 | * Done it all: now submit the commit record. We should have
|
| 113 | * cleaned up our previous buffers by now, so if we are in abort
|
| 114 | * mode we can now just skip the rest of the journal write
|
| 115 | * entirely.
|
| 116 | *
|
| 117 | * Returns 1 if the journal needs to be aborted or 0 on success
|
| 118 |
|
| 119 | static int journal_submit_commit_record(journal_t *journal,
|
| 120 | transaction_t *commit_transaction,
|
| 121 | struct buffer_head **cbh,
|
| 122 | __u32 crc32_sum)
|
| 123 | {
|
| 124 | struct commit_header *tmp;
|
| 125 | struct buffer_head *bh;
|
| 126 | int ret;
|
| 127 | struct timespec now = current_kernel_time();
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| 128 |
|
| 129 | *cbh = NULL;
|
| 130 |
|
| 131 | if (is_journal_aborted(journal))
|
| 132 | return 0;
|
| 133 |
|
| 134 | bh = jbd2_journal_get_descriptor_buffer(journal);
|
| 135 | if (!bh)
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| 136 | return 1;
|
| 137 |
|
| 138 | tmp = (struct commit_header *)bh->b_data;
|
| 139 | tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
|
| 140 | tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK);
|
| 141 | tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid);
|
| 142 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec);
|
| 143 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec);
|
| 144 |
|
| 145 | if (JBD2_HAS_COMPAT_FEATURE(journal,
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| 146 | JBD2_FEATURE_COMPAT_CHECKSUM)) {
|
| 147 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM;
|
| 148 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE;
|
| 149 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum);
|
| 150 | }
|
| 151 | jbd2_commit_block_csum_set(journal, bh);
|
| 152 |
|
| 153 | BUFFER_TRACE(bh, "submit commit block");
|
| 154 | lock_buffer(bh);
|
| 155 | clear_buffer_dirty(bh);
|
| 156 | set_buffer_uptodate(bh);
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| 157 | bh->b_end_io = journal_end_buffer_io_sync;
|
| 158 |
|
| 159 | if (journal->j_flags & JBD2_BARRIER &&
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| 160 | !JBD2_HAS_INCOMPAT_FEATURE(journal,
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| 161 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT))
|
| 162 | ret = submit_bh(WRITE_SYNC | WRITE_FLUSH_FUA, bh);
|
| 163 | else
|
| 164 | ret = submit_bh(WRITE_SYNC, bh);
|
| 165 |
|
| 166 | *cbh = bh;
|
| 167 | return ret;
|
| 168 | }
|
| 169 |
|
| 170 | |
| 171 | * This function along with journal_submit_commit_record
|
| 172 | * allows to write the commit record asynchronously.
|
| 173 |
|
| 174 | static int journal_wait_on_commit_record(journal_t *journal,
|
| 175 | struct buffer_head *bh)
|
| 176 | {
|
| 177 | int ret = 0;
|
| 178 |
|
| 179 | clear_buffer_dirty(bh);
|
| 180 | wait_on_buffer(bh);
|
| 181 |
|
| 182 | if (unlikely(!buffer_uptodate(bh)))
|
| 183 | ret = -EIO;
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| 184 | put_bh(bh);
|
| 185 |
|
| 186 | return ret;
|
| 187 | }
|
| 188 |
|
| 189 | |
| 190 | * write the filemap data using writepage() address_space_operations.
|
| 191 | * We don't do block allocation here even for delalloc. We don't
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| 192 | * use writepages() because with dealyed allocation we may be doing
|
| 193 | * block allocation in writepages().
|
| 194 |
|
| 195 | static int journal_submit_inode_data_buffers(struct address_space *mapping)
|
| 196 | {
|
| 197 | int ret;
|
| 198 | struct writeback_control wbc = {
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| 199 | .sync_mode = WB_SYNC_ALL,
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| 200 | .nr_to_write = mapping->nrpages * 2,
|
| 201 | .range_start = 0,
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| 202 | .range_end = i_size_read(mapping->host),
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| 203 | };
|
| 204 |
|
| 205 | ret = generic_writepages(mapping, &wbc);
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| 206 | return ret;
|
| 207 | }
|
| 208 |
|
| 209 | |
| 210 | * Submit all the data buffers of inode associated with the transaction to
|
| 211 | * disk.
|
| 212 | *
|
| 213 | * We are in a committing transaction. Therefore no new inode can be added to
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| 214 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently
|
| 215 | * operate on from being released while we write out pages.
|
| 216 |
|
| 217 | static int journal_submit_data_buffers(journal_t *journal,
|
| 218 | transaction_t *commit_transaction)
|
| 219 | {
|
| 220 | struct jbd2_inode *jinode;
|
| 221 | int err, ret = 0;
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| 222 | struct address_space *mapping;
|
| 223 |
|
| 224 | spin_lock(&journal->j_list_lock);
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| 225 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
|
| 226 | mapping = jinode->i_vfs_inode->i_mapping;
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| 227 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
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| 228 | spin_unlock(&journal->j_list_lock);
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| 229 | |
| 230 | * submit the inode data buffers. We use writepage
|
| 231 | * instead of writepages. Because writepages can do
|
| 232 | * block allocation with delalloc. We need to write
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| 233 | * only allocated blocks here.
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| 234 |
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| 235 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode);
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| 236 | err = journal_submit_inode_data_buffers(mapping);
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| 237 | if (!ret)
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| 238 | ret = err;
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| 239 | spin_lock(&journal->j_list_lock);
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| 240 | J_ASSERT(jinode->i_transaction == commit_transaction);
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| 241 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
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| 242 | smp_mb__after_clear_bit();
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| 243 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
|
| 244 | }
|
| 245 | spin_unlock(&journal->j_list_lock);
|
| 246 | return ret;
|
| 247 | }
|
| 248 |
|
| 249 | |
| 250 | * Wait for data submitted for writeout, refile inodes to proper
|
| 251 | * transaction if needed.
|
| 252 | *
|
| 253 |
|
| 254 | static int journal_finish_inode_data_buffers(journal_t *journal,
|
| 255 | transaction_t *commit_transaction)
|
| 256 | {
|
| 257 | struct jbd2_inode *jinode, *next_i;
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| 258 | int err, ret = 0;
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| 259 |
|
| 260 |
|
| 261 | spin_lock(&journal->j_list_lock);
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| 262 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
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| 263 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
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| 264 | spin_unlock(&journal->j_list_lock);
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| 265 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping);
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| 266 | if (err) {
|
| 267 | |
| 268 | * Because AS_EIO is cleared by
|
| 269 | * filemap_fdatawait_range(), set it again so
|
| 270 | * that user process can get -EIO from fsync().
|
| 271 |
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| 272 | set_bit(AS_EIO,
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| 273 | &jinode->i_vfs_inode->i_mapping->flags);
|
| 274 |
|
| 275 | if (!ret)
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| 276 | ret = err;
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| 277 | }
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| 278 | spin_lock(&journal->j_list_lock);
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| 279 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
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| 280 | smp_mb__after_clear_bit();
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| 281 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
|
| 282 | }
|
| 283 |
|
| 284 |
|
| 285 | list_for_each_entry_safe(jinode, next_i,
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| 286 | &commit_transaction->t_inode_list, i_list) {
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| 287 | list_del(&jinode->i_list);
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| 288 | if (jinode->i_next_transaction) {
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| 289 | jinode->i_transaction = jinode->i_next_transaction;
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| 290 | jinode->i_next_transaction = NULL;
|
| 291 | list_add(&jinode->i_list,
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| 292 | &jinode->i_transaction->t_inode_list);
|
| 293 | } else {
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| 294 | jinode->i_transaction = NULL;
|
| 295 | }
|
| 296 | }
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| 297 | spin_unlock(&journal->j_list_lock);
|
| 298 |
|
| 299 | return ret;
|
| 300 | }
|
| 301 |
|
| 302 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh)
|
| 303 | {
|
| 304 | struct page *page = bh->b_page;
|
| 305 | char *addr;
|
| 306 | __u32 checksum;
|
| 307 |
|
| 308 | addr = kmap_atomic(page);
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| 309 | checksum = crc32_be(crc32_sum,
|
| 310 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size);
|
| 311 | kunmap_atomic(addr);
|
| 312 |
|
| 313 | return checksum;
|
| 314 | }
|
| 315 |
|
| 316 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag,
|
| 317 | unsigned long long block)
|
| 318 | {
|
| 319 | tag->t_blocknr = cpu_to_be32(block & (u32)~0);
|
| 320 | if (tag_bytes > JBD2_TAG_SIZE32)
|
| 321 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1);
|
| 322 | }
|
| 323 |
|
| 324 | static void jbd2_descr_block_csum_set(journal_t *j,
|
| 325 | struct buffer_head *bh)
|
| 326 | {
|
| 327 | struct jbd2_journal_block_tail *tail;
|
| 328 | __u32 csum;
|
| 329 |
|
| 330 | if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
|
| 331 | return;
|
| 332 |
|
| 333 | tail = (struct jbd2_journal_block_tail *)(bh->b_data + j->j_blocksize -
|
| 334 | sizeof(struct jbd2_journal_block_tail));
|
| 335 | tail->t_checksum = 0;
|
| 336 | csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize);
|
| 337 | tail->t_checksum = cpu_to_be32(csum);
|
| 338 | }
|
| 339 |
|
| 340 | static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
|
| 341 | struct buffer_head *bh, __u32 sequence)
|
| 342 | {
|
| 343 | struct page *page = bh->b_page;
|
| 344 | __u8 *addr;
|
| 345 | __u32 csum32;
|
| 346 | __be32 seq;
|
| 347 |
|
| 348 | if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
|
| 349 | return;
|
| 350 |
|
| 351 | seq = cpu_to_be32(sequence);
|
| 352 | addr = kmap_atomic(page);
|
| 353 | csum32 = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&seq, sizeof(seq));
|
| 354 | csum32 = jbd2_chksum(j, csum32, addr + offset_in_page(bh->b_data),
|
| 355 | bh->b_size);
|
| 356 | kunmap_atomic(addr);
|
| 357 |
|
| 358 |
|
| 359 | tag->t_checksum = cpu_to_be16(csum32);
|
| 360 | }
|
| 361 | |
| 362 | * jbd2_journal_commit_transaction
|
| 363 | *
|
| 364 | * The primary function for committing a transaction to the log. This
|
| 365 | * function is called by the journal thread to begin a complete commit.
|
| 366 |
|
| 367 | void jbd2_journal_commit_transaction(journal_t *journal)
|
| 368 | {
|
| 369 | struct transaction_stats_s stats;
|
| 370 | transaction_t *commit_transaction;
|
| 371 | struct journal_head *jh;
|
| 372 | struct buffer_head *descriptor;
|
| 373 | struct buffer_head **wbuf = journal->j_wbuf;
|
| 374 | int bufs;
|
| 375 | int flags;
|
| 376 | int err;
|
| 377 | unsigned long long blocknr;
|
| 378 | ktime_t start_time;
|
| 379 | u64 commit_time;
|
| 380 | char *tagp = NULL;
|
| 381 | journal_header_t *header;
|
| 382 | journal_block_tag_t *tag = NULL;
|
| 383 | int space_left = 0;
|
| 384 | int first_tag = 0;
|
| 385 | int tag_flag;
|
| 386 | int i;
|
| 387 | int tag_bytes = journal_tag_bytes(journal);
|
| 388 | struct buffer_head *cbh = NULL;
|
| 389 | __u32 crc32_sum = ~0;
|
| 390 | struct blk_plug plug;
|
| 391 |
|
| 392 | unsigned long first_block;
|
| 393 | tid_t first_tid;
|
| 394 | int update_tail;
|
| 395 | int csum_size = 0;
|
| 396 | LIST_HEAD(io_bufs);
|
| 397 | LIST_HEAD(log_bufs);
|
| 398 |
|
| 399 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2))
|
| 400 | csum_size = sizeof(struct jbd2_journal_block_tail);
|
| 401 |
|
| 402 | |
| 403 | * First job: lock down the current transaction and wait for
|
| 404 | * all outstanding updates to complete.
|
| 405 |
|
| 406 |
|
| 407 |
|
| 408 | if (journal->j_flags & JBD2_FLUSHED) {
|
| 409 | jbd_debug(3, "super block updated\n");
|
| 410 | mutex_lock(&journal->j_checkpoint_mutex);
|
| 411 | |
| 412 | * We hold j_checkpoint_mutex so tail cannot change under us.
|
| 413 | * We don't need any special data guarantees for writing sb
|
| 414 | * since journal is empty and it is ok for write to be
|
| 415 | * flushed only with transaction commit.
|
| 416 |
|
| 417 | jbd2_journal_update_sb_log_tail(journal,
|
| 418 | journal->j_tail_sequence,
|
| 419 | journal->j_tail,
|
| 420 | WRITE_SYNC);
|
| 421 | mutex_unlock(&journal->j_checkpoint_mutex);
|
| 422 | } else {
|
| 423 | jbd_debug(3, "superblock not updated\n");
|
| 424 | }
|
| 425 |
|
| 426 | J_ASSERT(journal->j_running_transaction != NULL);
|
| 427 | J_ASSERT(journal->j_committing_transaction == NULL);
|
| 428 |
|
| 429 | commit_transaction = journal->j_running_transaction;
|
| 430 |
|
| 431 | trace_jbd2_start_commit(journal, commit_transaction);
|
| 432 | jbd_debug(1, "JBD2: starting commit of transaction %d\n",
|
| 433 | commit_transaction->t_tid);
|
| 434 |
|
| 435 | write_lock(&journal->j_state_lock);
|
| 436 | J_ASSERT(commit_transaction->t_state == T_RUNNING);
|
| 437 | commit_transaction->t_state = T_LOCKED;
|
| 438 |
|
| 439 | trace_jbd2_commit_locking(journal, commit_transaction);
|
| 440 | stats.run.rs_wait = commit_transaction->t_max_wait;
|
| 441 | stats.run.rs_request_delay = 0;
|
| 442 | stats.run.rs_locked = jiffies;
|
| 443 | if (commit_transaction->t_requested)
|
| 444 | stats.run.rs_request_delay =
|
| 445 | jbd2_time_diff(commit_transaction->t_requested,
|
| 446 | stats.run.rs_locked);
|
| 447 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
|
| 448 | stats.run.rs_locked);
|
| 449 |
|
| 450 | spin_lock(&commit_transaction->t_handle_lock);
|
| 451 | while (atomic_read(&commit_transaction->t_updates)) {
|
| 452 | DEFINE_WAIT(wait);
|
| 453 |
|
| 454 | prepare_to_wait(&journal->j_wait_updates, &wait,
|
| 455 | TASK_UNINTERRUPTIBLE);
|
| 456 | if (atomic_read(&commit_transaction->t_updates)) {
|
| 457 | spin_unlock(&commit_transaction->t_handle_lock);
|
| 458 | write_unlock(&journal->j_state_lock);
|
| 459 | schedule();
|
| 460 | write_lock(&journal->j_state_lock);
|
| 461 | spin_lock(&commit_transaction->t_handle_lock);
|
| 462 | }
|
| 463 | finish_wait(&journal->j_wait_updates, &wait);
|
| 464 | }
|
| 465 | spin_unlock(&commit_transaction->t_handle_lock);
|
| 466 |
|
| 467 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <=
|
| 468 | journal->j_max_transaction_buffers);
|
| 469 |
|
| 470 | |
| 471 | * First thing we are allowed to do is to discard any remaining
|
| 472 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume
|
| 473 | * that there are no such buffers: if a large filesystem
|
| 474 | * operation like a truncate needs to split itself over multiple
|
| 475 | * transactions, then it may try to do a jbd2_journal_restart() while
|
| 476 | * there are still BJ_Reserved buffers outstanding. These must
|
| 477 | * be released cleanly from the current transaction.
|
| 478 | *
|
| 479 | * In this case, the filesystem must still reserve write access
|
| 480 | * again before modifying the buffer in the new transaction, but
|
| 481 | * we do not require it to remember exactly which old buffers it
|
| 482 | * has reserved. This is consistent with the existing behaviour
|
| 483 | * that multiple jbd2_journal_get_write_access() calls to the same
|
| 484 | * buffer are perfectly permissible.
|
| 485 |
|
| 486 | while (commit_transaction->t_reserved_list) {
|
| 487 | jh = commit_transaction->t_reserved_list;
|
| 488 | JBUFFER_TRACE(jh, "reserved, unused: refile");
|
| 489 | |
| 490 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may
|
| 491 | * leave undo-committed data.
|
| 492 |
|
| 493 | if (jh->b_committed_data) {
|
| 494 | struct buffer_head *bh = jh2bh(jh);
|
| 495 |
|
| 496 | jbd_lock_bh_state(bh);
|
| 497 | jbd2_free(jh->b_committed_data, bh->b_size);
|
| 498 | jh->b_committed_data = NULL;
|
| 499 | jbd_unlock_bh_state(bh);
|
| 500 | }
|
| 501 | jbd2_journal_refile_buffer(journal, jh);
|
| 502 | }
|
| 503 |
|
| 504 | |
| 505 | * Now try to drop any written-back buffers from the journal's
|
| 506 | * checkpoint lists. We do this *before* commit because it potentially
|
| 507 | * frees some memory
|
| 508 |
|
| 509 | spin_lock(&journal->j_list_lock);
|
| 510 | __jbd2_journal_clean_checkpoint_list(journal);
|
| 511 | spin_unlock(&journal->j_list_lock);
|
| 512 |
|
| 513 | jbd_debug(3, "JBD2: commit phase 1\n");
|
| 514 |
|
| 515 | |
| 516 | * Clear revoked flag to reflect there is no revoked buffers
|
| 517 | * in the next transaction which is going to be started.
|
| 518 |
|
| 519 | jbd2_clear_buffer_revoked_flags(journal);
|
| 520 |
|
| 521 | |
| 522 | * Switch to a new revoke table.
|
| 523 |
|
| 524 | jbd2_journal_switch_revoke_table(journal);
|
| 525 |
|
| 526 | |
| 527 | * Reserved credits cannot be claimed anymore, free them
|
| 528 |
|
| 529 | atomic_sub(atomic_read(&journal->j_reserved_credits),
|
| 530 | &commit_transaction->t_outstanding_credits);
|
| 531 |
|
| 532 | trace_jbd2_commit_flushing(journal, commit_transaction);
|
| 533 | stats.run.rs_flushing = jiffies;
|
| 534 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked,
|
| 535 | stats.run.rs_flushing);
|
| 536 |
|
| 537 | commit_transaction->t_state = T_FLUSH;
|
| 538 | journal->j_committing_transaction = commit_transaction;
|
| 539 | journal->j_running_transaction = NULL;
|
| 540 | start_time = ktime_get();
|
| 541 | commit_transaction->t_log_start = journal->j_head;
|
| 542 | wake_up(&journal->j_wait_transaction_locked);
|
| 543 | write_unlock(&journal->j_state_lock);
|
| 544 |
|
| 545 | jbd_debug(3, "JBD2: commit phase 2a\n");
|
| 546 |
|
| 547 | |
| 548 | * Now start flushing things to disk, in the order they appear
|
| 549 | * on the transaction lists. Data blocks go first.
|
| 550 |
|
| 551 | err = journal_submit_data_buffers(journal, commit_transaction);
|
| 552 | if (err)
|
| 553 | jbd2_journal_abort(journal, err);
|
| 554 |
|
| 555 | blk_start_plug(&plug);
|
| 556 | jbd2_journal_write_revoke_records(journal, commit_transaction,
|
| 557 | &log_bufs, WRITE_SYNC);
|
| 558 | blk_finish_plug(&plug);
|
| 559 |
|
| 560 | jbd_debug(3, "JBD2: commit phase 2b\n");
|
| 561 |
|
| 562 | |
| 563 | * Way to go: we have now written out all of the data for a
|
| 564 | * transaction! Now comes the tricky part: we need to write out
|
| 565 | * metadata. Loop over the transaction's entire buffer list:
|
| 566 |
|
| 567 | write_lock(&journal->j_state_lock);
|
| 568 | commit_transaction->t_state = T_COMMIT;
|
| 569 | write_unlock(&journal->j_state_lock);
|
| 570 |
|
| 571 | trace_jbd2_commit_logging(journal, commit_transaction);
|
| 572 | stats.run.rs_logging = jiffies;
|
| 573 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing,
|
| 574 | stats.run.rs_logging);
|
| 575 | stats.run.rs_blocks =
|
| 576 | atomic_read(&commit_transaction->t_outstanding_credits);
|
| 577 | stats.run.rs_blocks_logged = 0;
|
| 578 |
|
| 579 | J_ASSERT(commit_transaction->t_nr_buffers <=
|
| 580 | atomic_read(&commit_transaction->t_outstanding_credits));
|
| 581 |
|
| 582 | err = 0;
|
| 583 | bufs = 0;
|
| 584 | descriptor = NULL;
|
| 585 | blk_start_plug(&plug);
|
| 586 | while (commit_transaction->t_buffers) {
|
| 587 |
|
| 588 |
|
| 589 |
|
| 590 | jh = commit_transaction->t_buffers;
|
| 591 |
|
| 592 | |
| 593 | release it.
|
| 594 |
|
| 595 | if (is_journal_aborted(journal)) {
|
| 596 | clear_buffer_jbddirty(jh2bh(jh));
|
| 597 | JBUFFER_TRACE(jh, "journal is aborting: refile");
|
| 598 | jbd2_buffer_abort_trigger(jh,
|
| 599 | jh->b_frozen_data ?
|
| 600 | jh->b_frozen_triggers :
|
| 601 | jh->b_triggers);
|
| 602 | jbd2_journal_refile_buffer(journal, jh);
|
| 603 | |
| 604 | * any descriptor buffers which may have been
|
| 605 | * already allocated, even if we are now
|
| 606 | * aborting.
|
| 607 | if (!commit_transaction->t_buffers)
|
| 608 | goto start_journal_io;
|
| 609 | continue;
|
| 610 | }
|
| 611 |
|
| 612 | |
| 613 | record the metadata buffer.
|
| 614 |
|
| 615 | if (!descriptor) {
|
| 616 | J_ASSERT (bufs == 0);
|
| 617 |
|
| 618 | jbd_debug(4, "JBD2: get descriptor\n");
|
| 619 |
|
| 620 | descriptor = jbd2_journal_get_descriptor_buffer(journal);
|
| 621 | if (!descriptor) {
|
| 622 | jbd2_journal_abort(journal, -EIO);
|
| 623 | continue;
|
| 624 | }
|
| 625 |
|
| 626 | jbd_debug(4, "JBD2: got buffer %llu (%p)\n",
|
| 627 | (unsigned long long)descriptor->b_blocknr,
|
| 628 | descriptor->b_data);
|
| 629 | header = (journal_header_t *)descriptor->b_data;
|
| 630 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
|
| 631 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK);
|
| 632 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid);
|
| 633 |
|
| 634 | tagp = &descriptor->b_data[sizeof(journal_header_t)];
|
| 635 | space_left = descriptor->b_size -
|
| 636 | sizeof(journal_header_t);
|
| 637 | first_tag = 1;
|
| 638 | set_buffer_jwrite(descriptor);
|
| 639 | set_buffer_dirty(descriptor);
|
| 640 | wbuf[bufs++] = descriptor;
|
| 641 |
|
| 642 | |
| 643 | completion later
|
| 644 | BUFFER_TRACE(descriptor, "ph3: file as descriptor");
|
| 645 | jbd2_file_log_bh(&log_bufs, descriptor);
|
| 646 | }
|
| 647 |
|
| 648 |
|
| 649 |
|
| 650 | err = jbd2_journal_next_log_block(journal, &blocknr);
|
| 651 | |
| 652 | and repeat this loop: we'll fall into the
|
| 653 | refile-on-abort condition above.
|
| 654 | if (err) {
|
| 655 | jbd2_journal_abort(journal, err);
|
| 656 | continue;
|
| 657 | }
|
| 658 |
|
| 659 | |
| 660 | * start_this_handle() uses t_outstanding_credits to determine
|
| 661 | * the free space in the log, but this counter is changed
|
| 662 | * by jbd2_journal_next_log_block() also.
|
| 663 |
|
| 664 | atomic_dec(&commit_transaction->t_outstanding_credits);
|
| 665 |
|
| 666 | |
| 667 | the shadowed buffer! @@@ This can go if we ever get
|
| 668 | rid of the shadow pairing of buffers.
|
| 669 | atomic_inc(&jh2bh(jh)->b_count);
|
| 670 |
|
| 671 | |
| 672 | * Make a temporary IO buffer with which to write it out
|
| 673 | * (this will requeue the metadata buffer to BJ_Shadow).
|
| 674 |
|
| 675 | set_bit(BH_JWrite, &jh2bh(jh)->b_state);
|
| 676 | JBUFFER_TRACE(jh, "ph3: write metadata");
|
| 677 | flags = jbd2_journal_write_metadata_buffer(commit_transaction,
|
| 678 | jh, &wbuf[bufs], blocknr);
|
| 679 | if (flags < 0) {
|
| 680 | jbd2_journal_abort(journal, flags);
|
| 681 | continue;
|
| 682 | }
|
| 683 | jbd2_file_log_bh(&io_bufs, wbuf[bufs]);
|
| 684 |
|
| 685 | |
| 686 | buffer
|
| 687 |
|
| 688 | tag_flag = 0;
|
| 689 | if (flags & 1)
|
| 690 | tag_flag |= JBD2_FLAG_ESCAPE;
|
| 691 | if (!first_tag)
|
| 692 | tag_flag |= JBD2_FLAG_SAME_UUID;
|
| 693 |
|
| 694 | tag = (journal_block_tag_t *) tagp;
|
| 695 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr);
|
| 696 | tag->t_flags = cpu_to_be16(tag_flag);
|
| 697 | jbd2_block_tag_csum_set(journal, tag, wbuf[bufs],
|
| 698 | commit_transaction->t_tid);
|
| 699 | tagp += tag_bytes;
|
| 700 | space_left -= tag_bytes;
|
| 701 | bufs++;
|
| 702 |
|
| 703 | if (first_tag) {
|
| 704 | memcpy (tagp, journal->j_uuid, 16);
|
| 705 | tagp += 16;
|
| 706 | space_left -= 16;
|
| 707 | first_tag = 0;
|
| 708 | }
|
| 709 |
|
| 710 | |
| 711 | let the IO rip!
|
| 712 |
|
| 713 | if (bufs == journal->j_wbufsize ||
|
| 714 | commit_transaction->t_buffers == NULL ||
|
| 715 | space_left < tag_bytes + 16 + csum_size) {
|
| 716 |
|
| 717 | jbd_debug(4, "JBD2: Submit %d IOs\n", bufs);
|
| 718 |
|
| 719 | |
| 720 | submitting the IOs. "tag" still points to
|
| 721 | the last tag we set up.
|
| 722 |
|
| 723 | tag->t_flags |= cpu_to_be16(JBD2_FLAG_LAST_TAG);
|
| 724 |
|
| 725 | jbd2_descr_block_csum_set(journal, descriptor);
|
| 726 | start_journal_io:
|
| 727 | for (i = 0; i < bufs; i++) {
|
| 728 | struct buffer_head *bh = wbuf[i];
|
| 729 | |
| 730 | * Compute checksum.
|
| 731 |
|
| 732 | if (JBD2_HAS_COMPAT_FEATURE(journal,
|
| 733 | JBD2_FEATURE_COMPAT_CHECKSUM)) {
|
| 734 | crc32_sum =
|
| 735 | jbd2_checksum_data(crc32_sum, bh);
|
| 736 | }
|
| 737 |
|
| 738 | lock_buffer(bh);
|
| 739 | clear_buffer_dirty(bh);
|
| 740 | set_buffer_uptodate(bh);
|
| 741 | bh->b_end_io = journal_end_buffer_io_sync;
|
| 742 | submit_bh(WRITE_SYNC, bh);
|
| 743 | }
|
| 744 | cond_resched();
|
| 745 | stats.run.rs_blocks_logged += bufs;
|
| 746 |
|
| 747 | |
| 748 | time round the loop.
|
| 749 | descriptor = NULL;
|
| 750 | bufs = 0;
|
| 751 | }
|
| 752 | }
|
| 753 |
|
| 754 | err = journal_finish_inode_data_buffers(journal, commit_transaction);
|
| 755 | if (err) {
|
| 756 | printk(KERN_WARNING
|
| 757 | "JBD2: Detected IO errors while flushing file data "
|
| 758 | "on %s\n", journal->j_devname);
|
| 759 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR)
|
| 760 | jbd2_journal_abort(journal, err);
|
| 761 | err = 0;
|
| 762 | }
|
| 763 |
|
| 764 | |
| 765 | * Get current oldest transaction in the log before we issue flush
|
| 766 | * to the filesystem device. After the flush we can be sure that
|
| 767 | * blocks of all older transactions are checkpointed to persistent
|
| 768 | * storage and we will be safe to update journal start in the
|
| 769 | * superblock with the numbers we get here.
|
| 770 |
|
| 771 | update_tail =
|
| 772 | jbd2_journal_get_log_tail(journal, &first_tid, &first_block);
|
| 773 |
|
| 774 | write_lock(&journal->j_state_lock);
|
| 775 | if (update_tail) {
|
| 776 | long freed = first_block - journal->j_tail;
|
| 777 |
|
| 778 | if (first_block < journal->j_tail)
|
| 779 | freed += journal->j_last - journal->j_first;
|
| 780 |
|
| 781 | if (freed < journal->j_maxlen / 4)
|
| 782 | update_tail = 0;
|
| 783 | }
|
| 784 | J_ASSERT(commit_transaction->t_state == T_COMMIT);
|
| 785 | commit_transaction->t_state = T_COMMIT_DFLUSH;
|
| 786 | write_unlock(&journal->j_state_lock);
|
| 787 |
|
| 788 | |
| 789 | * If the journal is not located on the file system device,
|
| 790 | * then we must flush the file system device before we issue
|
| 791 | * the commit record
|
| 792 |
|
| 793 | if (commit_transaction->t_need_data_flush &&
|
| 794 | (journal->j_fs_dev != journal->j_dev) &&
|
| 795 | (journal->j_flags & JBD2_BARRIER))
|
| 796 | blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS, NULL);
|
| 797 |
|
| 798 |
|
| 799 | if (JBD2_HAS_INCOMPAT_FEATURE(journal,
|
| 800 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
|
| 801 | err = journal_submit_commit_record(journal, commit_transaction,
|
| 802 | &cbh, crc32_sum);
|
| 803 | if (err)
|
| 804 | __jbd2_journal_abort_hard(journal);
|
| 805 | }
|
| 806 |
|
| 807 | blk_finish_plug(&plug);
|
| 808 |
|
| 809 | |
| 810 | the log. Before we can commit it, wait for the IO so far to
|
| 811 | complete. Control buffers being written are on the
|
| 812 | transaction's t_log_list queue, and metadata buffers are on
|
| 813 | the io_bufs list.
|
| 814 |
|
| 815 | Wait for the buffers in reverse order. That way we are
|
| 816 | less likely to be woken up until all IOs have completed, and
|
| 817 | so we incur less scheduling load.
|
| 818 |
|
| 819 |
|
| 820 | jbd_debug(3, "JBD2: commit phase 3\n");
|
| 821 |
|
| 822 | while (!list_empty(&io_bufs)) {
|
| 823 | struct buffer_head *bh = list_entry(io_bufs.prev,
|
| 824 | struct buffer_head,
|
| 825 | b_assoc_buffers);
|
| 826 |
|
| 827 | wait_on_buffer(bh);
|
| 828 | cond_resched();
|
| 829 |
|
| 830 | if (unlikely(!buffer_uptodate(bh)))
|
| 831 | err = -EIO;
|
| 832 | jbd2_unfile_log_bh(bh);
|
| 833 |
|
| 834 | |
| 835 | * The list contains temporary buffer heads created by
|
| 836 | * jbd2_journal_write_metadata_buffer().
|
| 837 |
|
| 838 | BUFFER_TRACE(bh, "dumping temporary bh");
|
| 839 | __brelse(bh);
|
| 840 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0);
|
| 841 | free_buffer_head(bh);
|
| 842 |
|
| 843 |
|
| 844 | jh = commit_transaction->t_shadow_list->b_tprev;
|
| 845 | bh = jh2bh(jh);
|
| 846 | clear_buffer_jwrite(bh);
|
| 847 | J_ASSERT_BH(bh, buffer_jbddirty(bh));
|
| 848 | J_ASSERT_BH(bh, !buffer_shadow(bh));
|
| 849 |
|
| 850 | |
| 851 | to remember it against this transaction so that when
|
| 852 | we finally commit, we can do any checkpointing
|
| 853 | required.
|
| 854 | JBUFFER_TRACE(jh, "file as BJ_Forget");
|
| 855 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget);
|
| 856 | JBUFFER_TRACE(jh, "brelse shadowed buffer");
|
| 857 | __brelse(bh);
|
| 858 | }
|
| 859 |
|
| 860 | J_ASSERT (commit_transaction->t_shadow_list == NULL);
|
| 861 |
|
| 862 | jbd_debug(3, "JBD2: commit phase 4\n");
|
| 863 |
|
| 864 |
|
| 865 | while (!list_empty(&log_bufs)) {
|
| 866 | struct buffer_head *bh;
|
| 867 |
|
| 868 | bh = list_entry(log_bufs.prev, struct buffer_head, b_assoc_buffers);
|
| 869 | wait_on_buffer(bh);
|
| 870 | cond_resched();
|
| 871 |
|
| 872 | if (unlikely(!buffer_uptodate(bh)))
|
| 873 | err = -EIO;
|
| 874 |
|
| 875 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile");
|
| 876 | clear_buffer_jwrite(bh);
|
| 877 | jbd2_unfile_log_bh(bh);
|
| 878 | __brelse(bh);
|
| 879 |
|
| 880 | }
|
| 881 |
|
| 882 | if (err)
|
| 883 | jbd2_journal_abort(journal, err);
|
| 884 |
|
| 885 | jbd_debug(3, "JBD2: commit phase 5\n");
|
| 886 | write_lock(&journal->j_state_lock);
|
| 887 | J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH);
|
| 888 | commit_transaction->t_state = T_COMMIT_JFLUSH;
|
| 889 | write_unlock(&journal->j_state_lock);
|
| 890 |
|
| 891 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
|
| 892 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
|
| 893 | err = journal_submit_commit_record(journal, commit_transaction,
|
| 894 | &cbh, crc32_sum);
|
| 895 | if (err)
|
| 896 | __jbd2_journal_abort_hard(journal);
|
| 897 | }
|
| 898 | if (cbh)
|
| 899 | err = journal_wait_on_commit_record(journal, cbh);
|
| 900 | if (JBD2_HAS_INCOMPAT_FEATURE(journal,
|
| 901 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) &&
|
| 902 | journal->j_flags & JBD2_BARRIER) {
|
| 903 | blkdev_issue_flush(journal->j_dev, GFP_NOFS, NULL);
|
| 904 | }
|
| 905 |
|
| 906 | if (err)
|
| 907 | jbd2_journal_abort(journal, err);
|
| 908 |
|
| 909 | |
| 910 | * Now disk caches for filesystem device are flushed so we are safe to
|
| 911 | * erase checkpointed transactions from the log by updating journal
|
| 912 | * superblock.
|
| 913 |
|
| 914 | if (update_tail)
|
| 915 | jbd2_update_log_tail(journal, first_tid, first_block);
|
| 916 |
|
| 917 | |
| 918 | processing: any buffers committed as a result of this
|
| 919 | transaction can be removed from any checkpoint list it was on
|
| 920 | before.
|
| 921 |
|
| 922 | jbd_debug(3, "JBD2: commit phase 6\n");
|
| 923 |
|
| 924 | J_ASSERT(list_empty(&commit_transaction->t_inode_list));
|
| 925 | J_ASSERT(commit_transaction->t_buffers == NULL);
|
| 926 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL);
|
| 927 | J_ASSERT(commit_transaction->t_shadow_list == NULL);
|
| 928 |
|
| 929 | restart_loop:
|
| 930 | |
| 931 | * As there are other places (journal_unmap_buffer()) adding buffers
|
| 932 | * to this list we have to be careful and hold the j_list_lock.
|
| 933 |
|
| 934 | spin_lock(&journal->j_list_lock);
|
| 935 | while (commit_transaction->t_forget) {
|
| 936 | transaction_t *cp_transaction;
|
| 937 | struct buffer_head *bh;
|
| 938 | int try_to_free = 0;
|
| 939 |
|
| 940 | jh = commit_transaction->t_forget;
|
| 941 | spin_unlock(&journal->j_list_lock);
|
| 942 | bh = jh2bh(jh);
|
| 943 | |
| 944 | * Get a reference so that bh cannot be freed before we are
|
| 945 | * done with it.
|
| 946 |
|
| 947 | get_bh(bh);
|
| 948 | jbd_lock_bh_state(bh);
|
| 949 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction);
|
| 950 |
|
| 951 | |
| 952 | * If there is undo-protected committed data against
|
| 953 | * this buffer, then we can remove it now. If it is a
|
| 954 | * buffer needing such protection, the old frozen_data
|
| 955 | * field now points to a committed version of the
|
| 956 | * buffer, so rotate that field to the new committed
|
| 957 | * data.
|
| 958 | *
|
| 959 | * Otherwise, we can just throw away the frozen data now.
|
| 960 | *
|
| 961 | * We also know that the frozen data has already fired
|
| 962 | * its triggers if they exist, so we can clear that too.
|
| 963 |
|
| 964 | if (jh->b_committed_data) {
|
| 965 | jbd2_free(jh->b_committed_data, bh->b_size);
|
| 966 | jh->b_committed_data = NULL;
|
| 967 | if (jh->b_frozen_data) {
|
| 968 | jh->b_committed_data = jh->b_frozen_data;
|
| 969 | jh->b_frozen_data = NULL;
|
| 970 | jh->b_frozen_triggers = NULL;
|
| 971 | }
|
| 972 | } else if (jh->b_frozen_data) {
|
| 973 | jbd2_free(jh->b_frozen_data, bh->b_size);
|
| 974 | jh->b_frozen_data = NULL;
|
| 975 | jh->b_frozen_triggers = NULL;
|
| 976 | }
|
| 977 |
|
| 978 | spin_lock(&journal->j_list_lock);
|
| 979 | cp_transaction = jh->b_cp_transaction;
|
| 980 | if (cp_transaction) {
|
| 981 | JBUFFER_TRACE(jh, "remove from old cp transaction");
|
| 982 | cp_transaction->t_chp_stats.cs_dropped++;
|
| 983 | __jbd2_journal_remove_checkpoint(jh);
|
| 984 | }
|
| 985 |
|
| 986 | |
| 987 | * dirty. If the buffer was added to the BJ_Forget list
|
| 988 | * by jbd2_journal_forget, it may no longer be dirty and
|
| 989 | * there's no point in keeping a checkpoint record for
|
| 990 | * it.
|
| 991 |
|
| 992 | |
| 993 | * A buffer which has been freed while still being journaled by
|
| 994 | * a previous transaction.
|
| 995 |
|
| 996 | if (buffer_freed(bh)) {
|
| 997 | |
| 998 | * If the running transaction is the one containing
|
| 999 | * "add to orphan" operation (b_next_transaction !=
|
| 1000 | * NULL), we have to wait for that transaction to
|
| 1001 | * commit before we can really get rid of the buffer.
|
| 1002 | * So just clear b_modified to not confuse transaction
|
| 1003 | * credit accounting and refile the buffer to
|
| 1004 | * BJ_Forget of the running transaction. If the just
|
| 1005 | * committed transaction contains "add to orphan"
|
| 1006 | * operation, we can completely invalidate the buffer
|
| 1007 | * now. We are rather through in that since the
|
| 1008 | * buffer may be still accessible when blocksize <
|
| 1009 | * pagesize and it is attached to the last partial
|
| 1010 | * page.
|
| 1011 |
|
| 1012 | jh->b_modified = 0;
|
| 1013 | if (!jh->b_next_transaction) {
|
| 1014 | clear_buffer_freed(bh);
|
| 1015 | clear_buffer_jbddirty(bh);
|
| 1016 | clear_buffer_mapped(bh);
|
| 1017 | clear_buffer_new(bh);
|
| 1018 | clear_buffer_req(bh);
|
| 1019 | bh->b_bdev = NULL;
|
| 1020 | }
|
| 1021 | }
|
| 1022 |
|
| 1023 | if (buffer_jbddirty(bh)) {
|
| 1024 | JBUFFER_TRACE(jh, "add to new checkpointing trans");
|
| 1025 | __jbd2_journal_insert_checkpoint(jh, commit_transaction);
|
| 1026 | if (is_journal_aborted(journal))
|
| 1027 | clear_buffer_jbddirty(bh);
|
| 1028 | } else {
|
| 1029 | J_ASSERT_BH(bh, !buffer_dirty(bh));
|
| 1030 | |
| 1031 | * The buffer on BJ_Forget list and not jbddirty means
|
| 1032 | * it has been freed by this transaction and hence it
|
| 1033 | * could not have been reallocated until this
|
| 1034 | * transaction has committed. *BUT* it could be
|
| 1035 | * reallocated once we have written all the data to
|
| 1036 | * disk and before we process the buffer on BJ_Forget
|
| 1037 | * list.
|
| 1038 |
|
| 1039 | if (!jh->b_next_transaction)
|
| 1040 | try_to_free = 1;
|
| 1041 | }
|
| 1042 | JBUFFER_TRACE(jh, "refile or unfile buffer");
|
| 1043 | __jbd2_journal_refile_buffer(jh);
|
| 1044 | jbd_unlock_bh_state(bh);
|
| 1045 | if (try_to_free)
|
| 1046 | release_buffer_page(bh);
|
| 1047 | else
|
| 1048 | __brelse(bh);
|
| 1049 | cond_resched_lock(&journal->j_list_lock);
|
| 1050 | }
|
| 1051 | spin_unlock(&journal->j_list_lock);
|
| 1052 | |
| 1053 | * This is a bit sleazy. We use j_list_lock to protect transition
|
| 1054 | * of a transaction into T_FINISHED state and calling
|
| 1055 | * __jbd2_journal_drop_transaction(). Otherwise we could race with
|
| 1056 | * other checkpointing code processing the transaction...
|
| 1057 |
|
| 1058 | write_lock(&journal->j_state_lock);
|
| 1059 | spin_lock(&journal->j_list_lock);
|
| 1060 | |
| 1061 | * Now recheck if some buffers did not get attached to the transaction
|
| 1062 | * while the lock was dropped...
|
| 1063 |
|
| 1064 | if (commit_transaction->t_forget) {
|
| 1065 | spin_unlock(&journal->j_list_lock);
|
| 1066 | write_unlock(&journal->j_state_lock);
|
| 1067 | goto restart_loop;
|
| 1068 | }
|
| 1069 |
|
| 1070 |
|
| 1071 |
|
| 1072 | jbd_debug(3, "JBD2: commit phase 7\n");
|
| 1073 |
|
| 1074 | J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH);
|
| 1075 |
|
| 1076 | commit_transaction->t_start = jiffies;
|
| 1077 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,
|
| 1078 | commit_transaction->t_start);
|
| 1079 |
|
| 1080 | |
| 1081 | * File the transaction statistics
|
| 1082 |
|
| 1083 | stats.ts_tid = commit_transaction->t_tid;
|
| 1084 | stats.run.rs_handle_count =
|
| 1085 | atomic_read(&commit_transaction->t_handle_count);
|
| 1086 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev,
|
| 1087 | commit_transaction->t_tid, &stats.run);
|
| 1088 |
|
| 1089 | |
| 1090 | * Calculate overall stats
|
| 1091 |
|
| 1092 | spin_lock(&journal->j_history_lock);
|
| 1093 | journal->j_stats.ts_tid++;
|
| 1094 | if (commit_transaction->t_requested)
|
| 1095 | journal->j_stats.ts_requested++;
|
| 1096 | journal->j_stats.run.rs_wait += stats.run.rs_wait;
|
| 1097 | journal->j_stats.run.rs_request_delay += stats.run.rs_request_delay;
|
| 1098 | journal->j_stats.run.rs_running += stats.run.rs_running;
|
| 1099 | journal->j_stats.run.rs_locked += stats.run.rs_locked;
|
| 1100 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing;
|
| 1101 | journal->j_stats.run.rs_logging += stats.run.rs_logging;
|
| 1102 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count;
|
| 1103 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks;
|
| 1104 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged;
|
| 1105 | spin_unlock(&journal->j_history_lock);
|
| 1106 |
|
| 1107 | commit_transaction->t_state = T_COMMIT_CALLBACK;
|
| 1108 | J_ASSERT(commit_transaction == journal->j_committing_transaction);
|
| 1109 | journal->j_commit_sequence = commit_transaction->t_tid;
|
| 1110 | journal->j_committing_transaction = NULL;
|
| 1111 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
|
| 1112 |
|
| 1113 | |
| 1114 | * weight the commit time higher than the average time so we don't
|
| 1115 | * react too strongly to vast changes in the commit time
|
| 1116 |
|
| 1117 | if (likely(journal->j_average_commit_time))
|
| 1118 | journal->j_average_commit_time = (commit_time +
|
| 1119 | journal->j_average_commit_time*3) / 4;
|
| 1120 | else
|
| 1121 | journal->j_average_commit_time = commit_time;
|
| 1122 |
|
| 1123 | write_unlock(&journal->j_state_lock);
|
| 1124 |
|
| 1125 | if (journal->j_checkpoint_transactions == NULL) {
|
| 1126 | journal->j_checkpoint_transactions = commit_transaction;
|
| 1127 | commit_transaction->t_cpnext = commit_transaction;
|
| 1128 | commit_transaction->t_cpprev = commit_transaction;
|
| 1129 | } else {
|
| 1130 | commit_transaction->t_cpnext =
|
| 1131 | journal->j_checkpoint_transactions;
|
| 1132 | commit_transaction->t_cpprev =
|
| 1133 | commit_transaction->t_cpnext->t_cpprev;
|
| 1134 | commit_transaction->t_cpnext->t_cpprev =
|
| 1135 | commit_transaction;
|
| 1136 | commit_transaction->t_cpprev->t_cpnext =
|
| 1137 | commit_transaction;
|
| 1138 | }
|
| 1139 | spin_unlock(&journal->j_list_lock);
|
| 1140 | |
| 1141 | * __journal_remove_checkpoint() can not destroy transaction
|
| 1142 | * under us because it is not marked as T_FINISHED yet
|
| 1143 | if (journal->j_commit_callback)
|
| 1144 | journal->j_commit_callback(journal, commit_transaction);
|
| 1145 |
|
| 1146 | trace_jbd2_end_commit(journal, commit_transaction);
|
| 1147 | jbd_debug(1, "JBD2: commit %d complete, head %d\n",
|
| 1148 | journal->j_commit_sequence, journal->j_tail_sequence);
|
| 1149 |
|
| 1150 | write_lock(&journal->j_state_lock);
|
| 1151 | spin_lock(&journal->j_list_lock);
|
| 1152 | commit_transaction->t_state = T_FINISHED;
|
| 1153 |
|
| 1154 | if (commit_transaction->t_checkpoint_list == NULL &&
|
| 1155 | commit_transaction->t_checkpoint_io_list == NULL) {
|
| 1156 | __jbd2_journal_drop_transaction(journal, commit_transaction);
|
| 1157 | jbd2_journal_free_transaction(commit_transaction);
|
| 1158 | }
|
| 1159 | spin_unlock(&journal->j_list_lock);
|
| 1160 | write_unlock(&journal->j_state_lock);
|
| 1161 | wake_up(&journal->j_wait_done_commit);
|
| 1162 | }
|