Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2 | * linux/fs/jbd2/commit.c |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 3 | * |
| 4 | * Written by Stephen C. Tweedie <sct@redhat.com>, 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> |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 18 | #include <linux/jbd2.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 19 | #include <linux/errno.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/pagemap.h> |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 23 | #include <linux/jiffies.h> |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 24 | #include <linux/crc32.h> |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 25 | #include <linux/writeback.h> |
| 26 | #include <linux/backing-dev.h> |
Theodore Ts'o | fd98496 | 2009-01-05 21:34:13 -0500 | [diff] [blame] | 27 | #include <linux/bio.h> |
Theodore Ts'o | 0e3d2a6 | 2009-09-11 09:30:12 -0400 | [diff] [blame] | 28 | #include <linux/blkdev.h> |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 29 | #include <linux/bitops.h> |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 30 | #include <trace/events/jbd2.h> |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 31 | #include <asm/system.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 32 | |
| 33 | /* |
| 34 | * Default IO end handler for temporary BJ_IO buffer_heads. |
| 35 | */ |
| 36 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) |
| 37 | { |
| 38 | BUFFER_TRACE(bh, ""); |
| 39 | if (uptodate) |
| 40 | set_buffer_uptodate(bh); |
| 41 | else |
| 42 | clear_buffer_uptodate(bh); |
| 43 | unlock_buffer(bh); |
| 44 | } |
| 45 | |
| 46 | /* |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 47 | * When an ext4 file is truncated, it is possible that some pages are not |
| 48 | * successfully freed, because they are attached to a committing transaction. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 49 | * After the transaction commits, these pages are left on the LRU, with no |
| 50 | * ->mapping, and with attached buffers. These pages are trivially reclaimable |
| 51 | * by the VM, but their apparent absence upsets the VM accounting, and it makes |
| 52 | * the numbers in /proc/meminfo look odd. |
| 53 | * |
| 54 | * So here, we have a buffer which has just come off the forget list. Look to |
| 55 | * see if we can strip all buffers from the backing page. |
| 56 | * |
| 57 | * Called under lock_journal(), and possibly under journal_datalist_lock. The |
| 58 | * caller provided us with a ref against the buffer, and we drop that here. |
| 59 | */ |
| 60 | static void release_buffer_page(struct buffer_head *bh) |
| 61 | { |
| 62 | struct page *page; |
| 63 | |
| 64 | if (buffer_dirty(bh)) |
| 65 | goto nope; |
| 66 | if (atomic_read(&bh->b_count) != 1) |
| 67 | goto nope; |
| 68 | page = bh->b_page; |
| 69 | if (!page) |
| 70 | goto nope; |
| 71 | if (page->mapping) |
| 72 | goto nope; |
| 73 | |
| 74 | /* OK, it's a truncated page */ |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 75 | if (!trylock_page(page)) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 76 | goto nope; |
| 77 | |
| 78 | page_cache_get(page); |
| 79 | __brelse(bh); |
| 80 | try_to_free_buffers(page); |
| 81 | unlock_page(page); |
| 82 | page_cache_release(page); |
| 83 | return; |
| 84 | |
| 85 | nope: |
| 86 | __brelse(bh); |
| 87 | } |
| 88 | |
| 89 | /* |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 90 | * Done it all: now submit the commit record. We should have |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 91 | * cleaned up our previous buffers by now, so if we are in abort |
| 92 | * mode we can now just skip the rest of the journal write |
| 93 | * entirely. |
| 94 | * |
| 95 | * Returns 1 if the journal needs to be aborted or 0 on success |
| 96 | */ |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 97 | static int journal_submit_commit_record(journal_t *journal, |
| 98 | transaction_t *commit_transaction, |
| 99 | struct buffer_head **cbh, |
| 100 | __u32 crc32_sum) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 101 | { |
| 102 | struct journal_head *descriptor; |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 103 | struct commit_header *tmp; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 104 | struct buffer_head *bh; |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 105 | int ret; |
Theodore Ts'o | 736603a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 106 | struct timespec now = current_kernel_time(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 107 | |
Zhang Huan | 6cba611 | 2011-04-05 19:16:20 -0400 | [diff] [blame] | 108 | *cbh = NULL; |
| 109 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 110 | if (is_journal_aborted(journal)) |
| 111 | return 0; |
| 112 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 113 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 114 | if (!descriptor) |
| 115 | return 1; |
| 116 | |
| 117 | bh = jh2bh(descriptor); |
| 118 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 119 | tmp = (struct commit_header *)bh->b_data; |
| 120 | tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
| 121 | tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK); |
| 122 | tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
Theodore Ts'o | 736603a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 123 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
| 124 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 125 | |
| 126 | if (JBD2_HAS_COMPAT_FEATURE(journal, |
| 127 | JBD2_FEATURE_COMPAT_CHECKSUM)) { |
| 128 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; |
| 129 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; |
| 130 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 131 | } |
| 132 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 133 | JBUFFER_TRACE(descriptor, "submit commit block"); |
| 134 | lock_buffer(bh); |
Theodore Ts'o | 45a90bf | 2008-10-06 12:04:02 -0400 | [diff] [blame] | 135 | clear_buffer_dirty(bh); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 136 | set_buffer_uptodate(bh); |
| 137 | bh->b_end_io = journal_end_buffer_io_sync; |
| 138 | |
| 139 | if (journal->j_flags & JBD2_BARRIER && |
Theodore Ts'o | 0e3d2a6 | 2009-09-11 09:30:12 -0400 | [diff] [blame] | 140 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
Christoph Hellwig | 9c35575 | 2010-08-18 05:29:17 -0400 | [diff] [blame] | 141 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 142 | ret = submit_bh(WRITE_SYNC | WRITE_FLUSH_FUA, bh); |
Christoph Hellwig | 9c35575 | 2010-08-18 05:29:17 -0400 | [diff] [blame] | 143 | else |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 144 | ret = submit_bh(WRITE_SYNC, bh); |
Christoph Hellwig | 9c35575 | 2010-08-18 05:29:17 -0400 | [diff] [blame] | 145 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 146 | *cbh = bh; |
| 147 | return ret; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 150 | /* |
| 151 | * This function along with journal_submit_commit_record |
| 152 | * allows to write the commit record asynchronously. |
| 153 | */ |
Theodore Ts'o | fd98496 | 2009-01-05 21:34:13 -0500 | [diff] [blame] | 154 | static int journal_wait_on_commit_record(journal_t *journal, |
| 155 | struct buffer_head *bh) |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 156 | { |
| 157 | int ret = 0; |
| 158 | |
| 159 | clear_buffer_dirty(bh); |
| 160 | wait_on_buffer(bh); |
| 161 | |
| 162 | if (unlikely(!buffer_uptodate(bh))) |
| 163 | ret = -EIO; |
| 164 | put_bh(bh); /* One for getblk() */ |
| 165 | jbd2_journal_put_journal_head(bh2jh(bh)); |
| 166 | |
| 167 | return ret; |
| 168 | } |
| 169 | |
| 170 | /* |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 171 | * write the filemap data using writepage() address_space_operations. |
| 172 | * We don't do block allocation here even for delalloc. We don't |
| 173 | * use writepages() because with dealyed allocation we may be doing |
| 174 | * block allocation in writepages(). |
| 175 | */ |
| 176 | static int journal_submit_inode_data_buffers(struct address_space *mapping) |
| 177 | { |
| 178 | int ret; |
| 179 | struct writeback_control wbc = { |
| 180 | .sync_mode = WB_SYNC_ALL, |
| 181 | .nr_to_write = mapping->nrpages * 2, |
| 182 | .range_start = 0, |
| 183 | .range_end = i_size_read(mapping->host), |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 184 | }; |
| 185 | |
| 186 | ret = generic_writepages(mapping, &wbc); |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | /* |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 191 | * Submit all the data buffers of inode associated with the transaction to |
| 192 | * disk. |
| 193 | * |
| 194 | * We are in a committing transaction. Therefore no new inode can be added to |
| 195 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently |
| 196 | * operate on from being released while we write out pages. |
| 197 | */ |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 198 | static int journal_submit_data_buffers(journal_t *journal, |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 199 | transaction_t *commit_transaction) |
| 200 | { |
| 201 | struct jbd2_inode *jinode; |
| 202 | int err, ret = 0; |
| 203 | struct address_space *mapping; |
| 204 | |
| 205 | spin_lock(&journal->j_list_lock); |
| 206 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { |
| 207 | mapping = jinode->i_vfs_inode->i_mapping; |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 208 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 209 | spin_unlock(&journal->j_list_lock); |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 210 | /* |
| 211 | * submit the inode data buffers. We use writepage |
| 212 | * instead of writepages. Because writepages can do |
| 213 | * block allocation with delalloc. We need to write |
| 214 | * only allocated blocks here. |
| 215 | */ |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 216 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 217 | err = journal_submit_inode_data_buffers(mapping); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 218 | if (!ret) |
| 219 | ret = err; |
| 220 | spin_lock(&journal->j_list_lock); |
| 221 | J_ASSERT(jinode->i_transaction == commit_transaction); |
Theodore Ts'o | cc3e1be | 2009-12-23 06:52:08 -0500 | [diff] [blame] | 222 | commit_transaction->t_flushed_data_blocks = 1; |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 223 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
| 224 | smp_mb__after_clear_bit(); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 225 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
| 226 | } |
| 227 | spin_unlock(&journal->j_list_lock); |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * Wait for data submitted for writeout, refile inodes to proper |
| 233 | * transaction if needed. |
| 234 | * |
| 235 | */ |
| 236 | static int journal_finish_inode_data_buffers(journal_t *journal, |
| 237 | transaction_t *commit_transaction) |
| 238 | { |
| 239 | struct jbd2_inode *jinode, *next_i; |
| 240 | int err, ret = 0; |
| 241 | |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 242 | /* For locking, see the comment in journal_submit_data_buffers() */ |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 243 | spin_lock(&journal->j_list_lock); |
| 244 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 245 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 246 | spin_unlock(&journal->j_list_lock); |
| 247 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping); |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 248 | if (err) { |
| 249 | /* |
| 250 | * Because AS_EIO is cleared by |
Christoph Hellwig | 94004ed | 2009-09-30 22:16:33 +0200 | [diff] [blame] | 251 | * filemap_fdatawait_range(), set it again so |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 252 | * that user process can get -EIO from fsync(). |
| 253 | */ |
| 254 | set_bit(AS_EIO, |
| 255 | &jinode->i_vfs_inode->i_mapping->flags); |
| 256 | |
| 257 | if (!ret) |
| 258 | ret = err; |
| 259 | } |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 260 | spin_lock(&journal->j_list_lock); |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 261 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
| 262 | smp_mb__after_clear_bit(); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 263 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
| 264 | } |
| 265 | |
| 266 | /* Now refile inode to proper lists */ |
| 267 | list_for_each_entry_safe(jinode, next_i, |
| 268 | &commit_transaction->t_inode_list, i_list) { |
| 269 | list_del(&jinode->i_list); |
| 270 | if (jinode->i_next_transaction) { |
| 271 | jinode->i_transaction = jinode->i_next_transaction; |
| 272 | jinode->i_next_transaction = NULL; |
| 273 | list_add(&jinode->i_list, |
| 274 | &jinode->i_transaction->t_inode_list); |
| 275 | } else { |
| 276 | jinode->i_transaction = NULL; |
| 277 | } |
| 278 | } |
| 279 | spin_unlock(&journal->j_list_lock); |
| 280 | |
| 281 | return ret; |
| 282 | } |
| 283 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 284 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
| 285 | { |
| 286 | struct page *page = bh->b_page; |
| 287 | char *addr; |
| 288 | __u32 checksum; |
| 289 | |
| 290 | addr = kmap_atomic(page, KM_USER0); |
| 291 | checksum = crc32_be(crc32_sum, |
| 292 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); |
| 293 | kunmap_atomic(addr, KM_USER0); |
| 294 | |
| 295 | return checksum; |
| 296 | } |
| 297 | |
| 298 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag, |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 299 | unsigned long long block) |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 300 | { |
| 301 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 302 | if (tag_bytes > JBD2_TAG_SIZE32) |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 303 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
| 304 | } |
| 305 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 306 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 307 | * jbd2_journal_commit_transaction |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 308 | * |
| 309 | * The primary function for committing a transaction to the log. This |
| 310 | * function is called by the journal thread to begin a complete commit. |
| 311 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 312 | void jbd2_journal_commit_transaction(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 313 | { |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 314 | struct transaction_stats_s stats; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 315 | transaction_t *commit_transaction; |
| 316 | struct journal_head *jh, *new_jh, *descriptor; |
| 317 | struct buffer_head **wbuf = journal->j_wbuf; |
| 318 | int bufs; |
| 319 | int flags; |
| 320 | int err; |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 321 | unsigned long long blocknr; |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 322 | ktime_t start_time; |
| 323 | u64 commit_time; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 324 | char *tagp = NULL; |
| 325 | journal_header_t *header; |
| 326 | journal_block_tag_t *tag = NULL; |
| 327 | int space_left = 0; |
| 328 | int first_tag = 0; |
| 329 | int tag_flag; |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 330 | int i, to_free = 0; |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 331 | int tag_bytes = journal_tag_bytes(journal); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 332 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
| 333 | __u32 crc32_sum = ~0; |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 334 | struct blk_plug plug; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 335 | |
| 336 | /* |
| 337 | * First job: lock down the current transaction and wait for |
| 338 | * all outstanding updates to complete. |
| 339 | */ |
| 340 | |
| 341 | #ifdef COMMIT_STATS |
| 342 | spin_lock(&journal->j_list_lock); |
| 343 | summarise_journal_usage(journal); |
| 344 | spin_unlock(&journal->j_list_lock); |
| 345 | #endif |
| 346 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 347 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
| 348 | if (journal->j_flags & JBD2_FLUSHED) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 349 | jbd_debug(3, "super block updated\n"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 350 | jbd2_journal_update_superblock(journal, 1); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 351 | } else { |
| 352 | jbd_debug(3, "superblock not updated\n"); |
| 353 | } |
| 354 | |
| 355 | J_ASSERT(journal->j_running_transaction != NULL); |
| 356 | J_ASSERT(journal->j_committing_transaction == NULL); |
| 357 | |
| 358 | commit_transaction = journal->j_running_transaction; |
| 359 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
| 360 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 361 | trace_jbd2_start_commit(journal, commit_transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 362 | jbd_debug(1, "JBD: starting commit of transaction %d\n", |
| 363 | commit_transaction->t_tid); |
| 364 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 365 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 366 | commit_transaction->t_state = T_LOCKED; |
| 367 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 368 | trace_jbd2_commit_locking(journal, commit_transaction); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 369 | stats.run.rs_wait = commit_transaction->t_max_wait; |
| 370 | stats.run.rs_locked = jiffies; |
| 371 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, |
| 372 | stats.run.rs_locked); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 373 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 374 | spin_lock(&commit_transaction->t_handle_lock); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 375 | while (atomic_read(&commit_transaction->t_updates)) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 376 | DEFINE_WAIT(wait); |
| 377 | |
| 378 | prepare_to_wait(&journal->j_wait_updates, &wait, |
| 379 | TASK_UNINTERRUPTIBLE); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 380 | if (atomic_read(&commit_transaction->t_updates)) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 381 | spin_unlock(&commit_transaction->t_handle_lock); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 382 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 383 | schedule(); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 384 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 385 | spin_lock(&commit_transaction->t_handle_lock); |
| 386 | } |
| 387 | finish_wait(&journal->j_wait_updates, &wait); |
| 388 | } |
| 389 | spin_unlock(&commit_transaction->t_handle_lock); |
| 390 | |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 391 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 392 | journal->j_max_transaction_buffers); |
| 393 | |
| 394 | /* |
| 395 | * First thing we are allowed to do is to discard any remaining |
| 396 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume |
| 397 | * that there are no such buffers: if a large filesystem |
| 398 | * operation like a truncate needs to split itself over multiple |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 399 | * transactions, then it may try to do a jbd2_journal_restart() while |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 400 | * there are still BJ_Reserved buffers outstanding. These must |
| 401 | * be released cleanly from the current transaction. |
| 402 | * |
| 403 | * In this case, the filesystem must still reserve write access |
| 404 | * again before modifying the buffer in the new transaction, but |
| 405 | * we do not require it to remember exactly which old buffers it |
| 406 | * has reserved. This is consistent with the existing behaviour |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 407 | * that multiple jbd2_journal_get_write_access() calls to the same |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 408 | * buffer are perfectly permissible. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 409 | */ |
| 410 | while (commit_transaction->t_reserved_list) { |
| 411 | jh = commit_transaction->t_reserved_list; |
| 412 | JBUFFER_TRACE(jh, "reserved, unused: refile"); |
| 413 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 414 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 415 | * leave undo-committed data. |
| 416 | */ |
| 417 | if (jh->b_committed_data) { |
| 418 | struct buffer_head *bh = jh2bh(jh); |
| 419 | |
| 420 | jbd_lock_bh_state(bh); |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 421 | jbd2_free(jh->b_committed_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 422 | jh->b_committed_data = NULL; |
| 423 | jbd_unlock_bh_state(bh); |
| 424 | } |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 425 | jbd2_journal_refile_buffer(journal, jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | /* |
| 429 | * Now try to drop any written-back buffers from the journal's |
| 430 | * checkpoint lists. We do this *before* commit because it potentially |
| 431 | * frees some memory |
| 432 | */ |
| 433 | spin_lock(&journal->j_list_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 434 | __jbd2_journal_clean_checkpoint_list(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 435 | spin_unlock(&journal->j_list_lock); |
| 436 | |
| 437 | jbd_debug (3, "JBD: commit phase 1\n"); |
| 438 | |
| 439 | /* |
| 440 | * Switch to a new revoke table. |
| 441 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 442 | jbd2_journal_switch_revoke_table(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 443 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 444 | trace_jbd2_commit_flushing(journal, commit_transaction); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 445 | stats.run.rs_flushing = jiffies; |
| 446 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, |
| 447 | stats.run.rs_flushing); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 448 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 449 | commit_transaction->t_state = T_FLUSH; |
| 450 | journal->j_committing_transaction = commit_transaction; |
| 451 | journal->j_running_transaction = NULL; |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 452 | start_time = ktime_get(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 453 | commit_transaction->t_log_start = journal->j_head; |
| 454 | wake_up(&journal->j_wait_transaction_locked); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 455 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 456 | |
| 457 | jbd_debug (3, "JBD: commit phase 2\n"); |
| 458 | |
| 459 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 460 | * Now start flushing things to disk, in the order they appear |
| 461 | * on the transaction lists. Data blocks go first. |
| 462 | */ |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 463 | err = journal_submit_data_buffers(journal, commit_transaction); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 464 | if (err) |
| 465 | jbd2_journal_abort(journal, err); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 466 | |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 467 | blk_start_plug(&plug); |
Theodore Ts'o | 67c457a | 2009-04-14 07:50:56 -0400 | [diff] [blame] | 468 | jbd2_journal_write_revoke_records(journal, commit_transaction, |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 469 | WRITE_SYNC); |
| 470 | blk_finish_plug(&plug); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 471 | |
| 472 | jbd_debug(3, "JBD: commit phase 2\n"); |
| 473 | |
| 474 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 475 | * Way to go: we have now written out all of the data for a |
| 476 | * transaction! Now comes the tricky part: we need to write out |
| 477 | * metadata. Loop over the transaction's entire buffer list: |
| 478 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 479 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 480 | commit_transaction->t_state = T_COMMIT; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 481 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 482 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 483 | trace_jbd2_commit_logging(journal, commit_transaction); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 484 | stats.run.rs_logging = jiffies; |
| 485 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, |
| 486 | stats.run.rs_logging); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 487 | stats.run.rs_blocks = |
| 488 | atomic_read(&commit_transaction->t_outstanding_credits); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 489 | stats.run.rs_blocks_logged = 0; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 490 | |
Josef Bacik | 1dfc322 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 491 | J_ASSERT(commit_transaction->t_nr_buffers <= |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 492 | atomic_read(&commit_transaction->t_outstanding_credits)); |
Josef Bacik | 1dfc322 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 493 | |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 494 | err = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 495 | descriptor = NULL; |
| 496 | bufs = 0; |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 497 | blk_start_plug(&plug); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 498 | while (commit_transaction->t_buffers) { |
| 499 | |
| 500 | /* Find the next buffer to be journaled... */ |
| 501 | |
| 502 | jh = commit_transaction->t_buffers; |
| 503 | |
| 504 | /* If we're in abort mode, we just un-journal the buffer and |
Hidehiro Kawai | 7ad7445 | 2008-10-10 20:29:31 -0400 | [diff] [blame] | 505 | release it. */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 506 | |
| 507 | if (is_journal_aborted(journal)) { |
Hidehiro Kawai | 7ad7445 | 2008-10-10 20:29:31 -0400 | [diff] [blame] | 508 | clear_buffer_jbddirty(jh2bh(jh)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 509 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 510 | jbd2_buffer_abort_trigger(jh, |
| 511 | jh->b_frozen_data ? |
| 512 | jh->b_frozen_triggers : |
| 513 | jh->b_triggers); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 514 | jbd2_journal_refile_buffer(journal, jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 515 | /* If that was the last one, we need to clean up |
| 516 | * any descriptor buffers which may have been |
| 517 | * already allocated, even if we are now |
| 518 | * aborting. */ |
| 519 | if (!commit_transaction->t_buffers) |
| 520 | goto start_journal_io; |
| 521 | continue; |
| 522 | } |
| 523 | |
| 524 | /* Make sure we have a descriptor block in which to |
| 525 | record the metadata buffer. */ |
| 526 | |
| 527 | if (!descriptor) { |
| 528 | struct buffer_head *bh; |
| 529 | |
| 530 | J_ASSERT (bufs == 0); |
| 531 | |
| 532 | jbd_debug(4, "JBD: get descriptor\n"); |
| 533 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 534 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 535 | if (!descriptor) { |
Jan Kara | a7fa2ba | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 536 | jbd2_journal_abort(journal, -EIO); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 537 | continue; |
| 538 | } |
| 539 | |
| 540 | bh = jh2bh(descriptor); |
| 541 | jbd_debug(4, "JBD: got buffer %llu (%p)\n", |
| 542 | (unsigned long long)bh->b_blocknr, bh->b_data); |
| 543 | header = (journal_header_t *)&bh->b_data[0]; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 544 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
| 545 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 546 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
| 547 | |
| 548 | tagp = &bh->b_data[sizeof(journal_header_t)]; |
| 549 | space_left = bh->b_size - sizeof(journal_header_t); |
| 550 | first_tag = 1; |
| 551 | set_buffer_jwrite(bh); |
| 552 | set_buffer_dirty(bh); |
| 553 | wbuf[bufs++] = bh; |
| 554 | |
| 555 | /* Record it so that we can wait for IO |
| 556 | completion later */ |
| 557 | BUFFER_TRACE(bh, "ph3: file as descriptor"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 558 | jbd2_journal_file_buffer(descriptor, commit_transaction, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 559 | BJ_LogCtl); |
| 560 | } |
| 561 | |
| 562 | /* Where is the buffer to be written? */ |
| 563 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 564 | err = jbd2_journal_next_log_block(journal, &blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 565 | /* If the block mapping failed, just abandon the buffer |
| 566 | and repeat this loop: we'll fall into the |
| 567 | refile-on-abort condition above. */ |
| 568 | if (err) { |
Jan Kara | a7fa2ba | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 569 | jbd2_journal_abort(journal, err); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 570 | continue; |
| 571 | } |
| 572 | |
| 573 | /* |
| 574 | * start_this_handle() uses t_outstanding_credits to determine |
| 575 | * the free space in the log, but this counter is changed |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 576 | * by jbd2_journal_next_log_block() also. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 577 | */ |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 578 | atomic_dec(&commit_transaction->t_outstanding_credits); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 579 | |
| 580 | /* Bump b_count to prevent truncate from stumbling over |
| 581 | the shadowed buffer! @@@ This can go if we ever get |
| 582 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ |
| 583 | atomic_inc(&jh2bh(jh)->b_count); |
| 584 | |
| 585 | /* Make a temporary IO buffer with which to write it out |
| 586 | (this will requeue both the metadata buffer and the |
| 587 | temporary IO buffer). new_bh goes on BJ_IO*/ |
| 588 | |
| 589 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
| 590 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 591 | * akpm: jbd2_journal_write_metadata_buffer() sets |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 592 | * new_bh->b_transaction to commit_transaction. |
| 593 | * We need to clean this up before we release new_bh |
| 594 | * (which is of type BJ_IO) |
| 595 | */ |
| 596 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 597 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 598 | jh, &new_jh, blocknr); |
Theodore Ts'o | e6ec116 | 2009-12-01 09:04:42 -0500 | [diff] [blame] | 599 | if (flags < 0) { |
| 600 | jbd2_journal_abort(journal, flags); |
| 601 | continue; |
| 602 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 603 | set_bit(BH_JWrite, &jh2bh(new_jh)->b_state); |
| 604 | wbuf[bufs++] = jh2bh(new_jh); |
| 605 | |
| 606 | /* Record the new block's tag in the current descriptor |
| 607 | buffer */ |
| 608 | |
| 609 | tag_flag = 0; |
| 610 | if (flags & 1) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 611 | tag_flag |= JBD2_FLAG_ESCAPE; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 612 | if (!first_tag) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 613 | tag_flag |= JBD2_FLAG_SAME_UUID; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 614 | |
| 615 | tag = (journal_block_tag_t *) tagp; |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 616 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 617 | tag->t_flags = cpu_to_be32(tag_flag); |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 618 | tagp += tag_bytes; |
| 619 | space_left -= tag_bytes; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 620 | |
| 621 | if (first_tag) { |
| 622 | memcpy (tagp, journal->j_uuid, 16); |
| 623 | tagp += 16; |
| 624 | space_left -= 16; |
| 625 | first_tag = 0; |
| 626 | } |
| 627 | |
| 628 | /* If there's no more to do, or if the descriptor is full, |
| 629 | let the IO rip! */ |
| 630 | |
| 631 | if (bufs == journal->j_wbufsize || |
| 632 | commit_transaction->t_buffers == NULL || |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 633 | space_left < tag_bytes + 16) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 634 | |
| 635 | jbd_debug(4, "JBD: Submit %d IOs\n", bufs); |
| 636 | |
| 637 | /* Write an end-of-descriptor marker before |
| 638 | submitting the IOs. "tag" still points to |
| 639 | the last tag we set up. */ |
| 640 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 641 | tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 642 | |
| 643 | start_journal_io: |
| 644 | for (i = 0; i < bufs; i++) { |
| 645 | struct buffer_head *bh = wbuf[i]; |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 646 | /* |
| 647 | * Compute checksum. |
| 648 | */ |
| 649 | if (JBD2_HAS_COMPAT_FEATURE(journal, |
| 650 | JBD2_FEATURE_COMPAT_CHECKSUM)) { |
| 651 | crc32_sum = |
| 652 | jbd2_checksum_data(crc32_sum, bh); |
| 653 | } |
| 654 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 655 | lock_buffer(bh); |
| 656 | clear_buffer_dirty(bh); |
| 657 | set_buffer_uptodate(bh); |
| 658 | bh->b_end_io = journal_end_buffer_io_sync; |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 659 | submit_bh(WRITE_SYNC, bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 660 | } |
| 661 | cond_resched(); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 662 | stats.run.rs_blocks_logged += bufs; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 663 | |
| 664 | /* Force a new descriptor to be generated next |
| 665 | time round the loop. */ |
| 666 | descriptor = NULL; |
| 667 | bufs = 0; |
| 668 | } |
| 669 | } |
| 670 | |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 671 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 672 | if (err) { |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 673 | printk(KERN_WARNING |
| 674 | "JBD2: Detected IO errors while flushing file data " |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 675 | "on %s\n", journal->j_devname); |
Hidehiro Kawai | 5bf5683 | 2008-10-10 22:12:43 -0400 | [diff] [blame] | 676 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) |
| 677 | jbd2_journal_abort(journal, err); |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 678 | err = 0; |
| 679 | } |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 680 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 681 | /* |
| 682 | * If the journal is not located on the file system device, |
| 683 | * then we must flush the file system device before we issue |
| 684 | * the commit record |
| 685 | */ |
| 686 | if (commit_transaction->t_flushed_data_blocks && |
| 687 | (journal->j_fs_dev != journal->j_dev) && |
| 688 | (journal->j_flags & JBD2_BARRIER)) |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 689 | blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 690 | |
| 691 | /* Done it all: now write the commit record asynchronously. */ |
| 692 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
| 693 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
| 694 | err = journal_submit_commit_record(journal, commit_transaction, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 695 | &cbh, crc32_sum); |
| 696 | if (err) |
| 697 | __jbd2_journal_abort_hard(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 698 | } |
| 699 | |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 700 | blk_finish_plug(&plug); |
| 701 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 702 | /* Lo and behold: we have just managed to send a transaction to |
| 703 | the log. Before we can commit it, wait for the IO so far to |
| 704 | complete. Control buffers being written are on the |
| 705 | transaction's t_log_list queue, and metadata buffers are on |
| 706 | the t_iobuf_list queue. |
| 707 | |
| 708 | Wait for the buffers in reverse order. That way we are |
| 709 | less likely to be woken up until all IOs have completed, and |
| 710 | so we incur less scheduling load. |
| 711 | */ |
| 712 | |
| 713 | jbd_debug(3, "JBD: commit phase 3\n"); |
| 714 | |
| 715 | /* |
| 716 | * akpm: these are BJ_IO, and j_list_lock is not needed. |
| 717 | * See __journal_try_to_free_buffer. |
| 718 | */ |
| 719 | wait_for_iobuf: |
| 720 | while (commit_transaction->t_iobuf_list != NULL) { |
| 721 | struct buffer_head *bh; |
| 722 | |
| 723 | jh = commit_transaction->t_iobuf_list->b_tprev; |
| 724 | bh = jh2bh(jh); |
| 725 | if (buffer_locked(bh)) { |
| 726 | wait_on_buffer(bh); |
| 727 | goto wait_for_iobuf; |
| 728 | } |
| 729 | if (cond_resched()) |
| 730 | goto wait_for_iobuf; |
| 731 | |
| 732 | if (unlikely(!buffer_uptodate(bh))) |
| 733 | err = -EIO; |
| 734 | |
| 735 | clear_buffer_jwrite(bh); |
| 736 | |
| 737 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 738 | jbd2_journal_unfile_buffer(journal, jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 739 | |
| 740 | /* |
| 741 | * ->t_iobuf_list should contain only dummy buffer_heads |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 742 | * which were created by jbd2_journal_write_metadata_buffer(). |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 743 | */ |
| 744 | BUFFER_TRACE(bh, "dumping temporary bh"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 745 | jbd2_journal_put_journal_head(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 746 | __brelse(bh); |
| 747 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); |
| 748 | free_buffer_head(bh); |
| 749 | |
| 750 | /* We also have to unlock and free the corresponding |
| 751 | shadowed buffer */ |
| 752 | jh = commit_transaction->t_shadow_list->b_tprev; |
| 753 | bh = jh2bh(jh); |
| 754 | clear_bit(BH_JWrite, &bh->b_state); |
| 755 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
| 756 | |
| 757 | /* The metadata is now released for reuse, but we need |
| 758 | to remember it against this transaction so that when |
| 759 | we finally commit, we can do any checkpointing |
| 760 | required. */ |
| 761 | JBUFFER_TRACE(jh, "file as BJ_Forget"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 762 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 763 | /* Wake up any transactions which were waiting for this |
| 764 | IO to complete */ |
| 765 | wake_up_bit(&bh->b_state, BH_Unshadow); |
| 766 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
| 767 | __brelse(bh); |
| 768 | } |
| 769 | |
| 770 | J_ASSERT (commit_transaction->t_shadow_list == NULL); |
| 771 | |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 772 | jbd_debug(3, "JBD: commit phase 4\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 773 | |
| 774 | /* Here we wait for the revoke record and descriptor record buffers */ |
| 775 | wait_for_ctlbuf: |
| 776 | while (commit_transaction->t_log_list != NULL) { |
| 777 | struct buffer_head *bh; |
| 778 | |
| 779 | jh = commit_transaction->t_log_list->b_tprev; |
| 780 | bh = jh2bh(jh); |
| 781 | if (buffer_locked(bh)) { |
| 782 | wait_on_buffer(bh); |
| 783 | goto wait_for_ctlbuf; |
| 784 | } |
| 785 | if (cond_resched()) |
| 786 | goto wait_for_ctlbuf; |
| 787 | |
| 788 | if (unlikely(!buffer_uptodate(bh))) |
| 789 | err = -EIO; |
| 790 | |
| 791 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); |
| 792 | clear_buffer_jwrite(bh); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 793 | jbd2_journal_unfile_buffer(journal, jh); |
| 794 | jbd2_journal_put_journal_head(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 795 | __brelse(bh); /* One for getblk */ |
| 796 | /* AKPM: bforget here */ |
| 797 | } |
| 798 | |
Hidehiro Kawai | 77e841d | 2008-10-12 16:39:16 -0400 | [diff] [blame] | 799 | if (err) |
| 800 | jbd2_journal_abort(journal, err); |
| 801 | |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 802 | jbd_debug(3, "JBD: commit phase 5\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 803 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 804 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
Theodore Ts'o | 0e3d2a6 | 2009-09-11 09:30:12 -0400 | [diff] [blame] | 805 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 806 | err = journal_submit_commit_record(journal, commit_transaction, |
| 807 | &cbh, crc32_sum); |
| 808 | if (err) |
| 809 | __jbd2_journal_abort_hard(journal); |
| 810 | } |
Zhang Huan | 6cba611 | 2011-04-05 19:16:20 -0400 | [diff] [blame] | 811 | if (cbh) |
Theodore Ts'o | fd98496 | 2009-01-05 21:34:13 -0500 | [diff] [blame] | 812 | err = journal_wait_on_commit_record(journal, cbh); |
Jan Kara | f73bee4 | 2010-08-18 15:56:56 +0200 | [diff] [blame] | 813 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
| 814 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) && |
| 815 | journal->j_flags & JBD2_BARRIER) { |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 816 | blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL); |
Jan Kara | f73bee4 | 2010-08-18 15:56:56 +0200 | [diff] [blame] | 817 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 818 | |
| 819 | if (err) |
Jan Kara | a7fa2ba | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 820 | jbd2_journal_abort(journal, err); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 821 | |
| 822 | /* End of a transaction! Finally, we can do checkpoint |
| 823 | processing: any buffers committed as a result of this |
| 824 | transaction can be removed from any checkpoint list it was on |
| 825 | before. */ |
| 826 | |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 827 | jbd_debug(3, "JBD: commit phase 6\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 828 | |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 829 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 830 | J_ASSERT(commit_transaction->t_buffers == NULL); |
| 831 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); |
| 832 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); |
| 833 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
| 834 | J_ASSERT(commit_transaction->t_log_list == NULL); |
| 835 | |
| 836 | restart_loop: |
| 837 | /* |
| 838 | * As there are other places (journal_unmap_buffer()) adding buffers |
| 839 | * to this list we have to be careful and hold the j_list_lock. |
| 840 | */ |
| 841 | spin_lock(&journal->j_list_lock); |
| 842 | while (commit_transaction->t_forget) { |
| 843 | transaction_t *cp_transaction; |
| 844 | struct buffer_head *bh; |
| 845 | |
| 846 | jh = commit_transaction->t_forget; |
| 847 | spin_unlock(&journal->j_list_lock); |
| 848 | bh = jh2bh(jh); |
| 849 | jbd_lock_bh_state(bh); |
dingdinghua | 23e2af3 | 2010-02-24 12:11:20 -0500 | [diff] [blame] | 850 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 851 | |
| 852 | /* |
| 853 | * If there is undo-protected committed data against |
| 854 | * this buffer, then we can remove it now. If it is a |
| 855 | * buffer needing such protection, the old frozen_data |
| 856 | * field now points to a committed version of the |
| 857 | * buffer, so rotate that field to the new committed |
| 858 | * data. |
| 859 | * |
| 860 | * Otherwise, we can just throw away the frozen data now. |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 861 | * |
| 862 | * We also know that the frozen data has already fired |
| 863 | * its triggers if they exist, so we can clear that too. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 864 | */ |
| 865 | if (jh->b_committed_data) { |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 866 | jbd2_free(jh->b_committed_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 867 | jh->b_committed_data = NULL; |
| 868 | if (jh->b_frozen_data) { |
| 869 | jh->b_committed_data = jh->b_frozen_data; |
| 870 | jh->b_frozen_data = NULL; |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 871 | jh->b_frozen_triggers = NULL; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 872 | } |
| 873 | } else if (jh->b_frozen_data) { |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 874 | jbd2_free(jh->b_frozen_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 875 | jh->b_frozen_data = NULL; |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 876 | jh->b_frozen_triggers = NULL; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | spin_lock(&journal->j_list_lock); |
| 880 | cp_transaction = jh->b_cp_transaction; |
| 881 | if (cp_transaction) { |
| 882 | JBUFFER_TRACE(jh, "remove from old cp transaction"); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 883 | cp_transaction->t_chp_stats.cs_dropped++; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 884 | __jbd2_journal_remove_checkpoint(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | /* Only re-checkpoint the buffer_head if it is marked |
| 888 | * dirty. If the buffer was added to the BJ_Forget list |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 889 | * by jbd2_journal_forget, it may no longer be dirty and |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 890 | * there's no point in keeping a checkpoint record for |
| 891 | * it. */ |
| 892 | |
| 893 | /* A buffer which has been freed while still being |
| 894 | * journaled by a previous transaction may end up still |
| 895 | * being dirty here, but we want to avoid writing back |
dingdinghua | ba86902 | 2010-02-15 16:35:42 -0500 | [diff] [blame] | 896 | * that buffer in the future after the "add to orphan" |
| 897 | * operation been committed, That's not only a performance |
| 898 | * gain, it also stops aliasing problems if the buffer is |
| 899 | * left behind for writeback and gets reallocated for another |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 900 | * use in a different page. */ |
dingdinghua | ba86902 | 2010-02-15 16:35:42 -0500 | [diff] [blame] | 901 | if (buffer_freed(bh) && !jh->b_next_transaction) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 902 | clear_buffer_freed(bh); |
| 903 | clear_buffer_jbddirty(bh); |
| 904 | } |
| 905 | |
| 906 | if (buffer_jbddirty(bh)) { |
| 907 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 908 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
Hidehiro Kawai | 7ad7445 | 2008-10-10 20:29:31 -0400 | [diff] [blame] | 909 | if (is_journal_aborted(journal)) |
| 910 | clear_buffer_jbddirty(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 911 | JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 912 | __jbd2_journal_refile_buffer(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 913 | jbd_unlock_bh_state(bh); |
| 914 | } else { |
| 915 | J_ASSERT_BH(bh, !buffer_dirty(bh)); |
| 916 | /* The buffer on BJ_Forget list and not jbddirty means |
| 917 | * it has been freed by this transaction and hence it |
| 918 | * could not have been reallocated until this |
| 919 | * transaction has committed. *BUT* it could be |
| 920 | * reallocated once we have written all the data to |
| 921 | * disk and before we process the buffer on BJ_Forget |
| 922 | * list. */ |
| 923 | JBUFFER_TRACE(jh, "refile or unfile freed buffer"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 924 | __jbd2_journal_refile_buffer(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 925 | if (!jh->b_transaction) { |
| 926 | jbd_unlock_bh_state(bh); |
| 927 | /* needs a brelse */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 928 | jbd2_journal_remove_journal_head(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 929 | release_buffer_page(bh); |
| 930 | } else |
| 931 | jbd_unlock_bh_state(bh); |
| 932 | } |
| 933 | cond_resched_lock(&journal->j_list_lock); |
| 934 | } |
| 935 | spin_unlock(&journal->j_list_lock); |
| 936 | /* |
Jan Kara | f5a7a6b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 937 | * This is a bit sleazy. We use j_list_lock to protect transition |
| 938 | * of a transaction into T_FINISHED state and calling |
| 939 | * __jbd2_journal_drop_transaction(). Otherwise we could race with |
| 940 | * other checkpointing code processing the transaction... |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 941 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 942 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 943 | spin_lock(&journal->j_list_lock); |
| 944 | /* |
| 945 | * Now recheck if some buffers did not get attached to the transaction |
| 946 | * while the lock was dropped... |
| 947 | */ |
| 948 | if (commit_transaction->t_forget) { |
| 949 | spin_unlock(&journal->j_list_lock); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 950 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 951 | goto restart_loop; |
| 952 | } |
| 953 | |
| 954 | /* Done with this transaction! */ |
| 955 | |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 956 | jbd_debug(3, "JBD: commit phase 7\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 957 | |
| 958 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
| 959 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 960 | commit_transaction->t_start = jiffies; |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 961 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
| 962 | commit_transaction->t_start); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 963 | |
| 964 | /* |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 965 | * File the transaction statistics |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 966 | */ |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 967 | stats.ts_tid = commit_transaction->t_tid; |
Theodore Ts'o | 8dd4204 | 2010-08-03 21:38:29 -0400 | [diff] [blame] | 968 | stats.run.rs_handle_count = |
| 969 | atomic_read(&commit_transaction->t_handle_count); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 970 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
| 971 | commit_transaction->t_tid, &stats.run); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 972 | |
| 973 | /* |
| 974 | * Calculate overall stats |
| 975 | */ |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 976 | spin_lock(&journal->j_history_lock); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 977 | journal->j_stats.ts_tid++; |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 978 | journal->j_stats.run.rs_wait += stats.run.rs_wait; |
| 979 | journal->j_stats.run.rs_running += stats.run.rs_running; |
| 980 | journal->j_stats.run.rs_locked += stats.run.rs_locked; |
| 981 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; |
| 982 | journal->j_stats.run.rs_logging += stats.run.rs_logging; |
| 983 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; |
| 984 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; |
| 985 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 986 | spin_unlock(&journal->j_history_lock); |
| 987 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 988 | commit_transaction->t_state = T_FINISHED; |
| 989 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
| 990 | journal->j_commit_sequence = commit_transaction->t_tid; |
| 991 | journal->j_committing_transaction = NULL; |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 992 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 993 | |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 994 | /* |
| 995 | * weight the commit time higher than the average time so we don't |
| 996 | * react too strongly to vast changes in the commit time |
| 997 | */ |
| 998 | if (likely(journal->j_average_commit_time)) |
| 999 | journal->j_average_commit_time = (commit_time + |
| 1000 | journal->j_average_commit_time*3) / 4; |
| 1001 | else |
| 1002 | journal->j_average_commit_time = commit_time; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1003 | write_unlock(&journal->j_state_lock); |
Theodore Ts'o | 6c20ec8 | 2008-10-28 21:08:20 -0400 | [diff] [blame] | 1004 | |
Jan Kara | f89b779 | 2007-07-15 23:37:20 -0700 | [diff] [blame] | 1005 | if (commit_transaction->t_checkpoint_list == NULL && |
| 1006 | commit_transaction->t_checkpoint_io_list == NULL) { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1007 | __jbd2_journal_drop_transaction(journal, commit_transaction); |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 1008 | to_free = 1; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1009 | } else { |
| 1010 | if (journal->j_checkpoint_transactions == NULL) { |
| 1011 | journal->j_checkpoint_transactions = commit_transaction; |
| 1012 | commit_transaction->t_cpnext = commit_transaction; |
| 1013 | commit_transaction->t_cpprev = commit_transaction; |
| 1014 | } else { |
| 1015 | commit_transaction->t_cpnext = |
| 1016 | journal->j_checkpoint_transactions; |
| 1017 | commit_transaction->t_cpprev = |
| 1018 | commit_transaction->t_cpnext->t_cpprev; |
| 1019 | commit_transaction->t_cpnext->t_cpprev = |
| 1020 | commit_transaction; |
| 1021 | commit_transaction->t_cpprev->t_cpnext = |
| 1022 | commit_transaction; |
| 1023 | } |
| 1024 | } |
| 1025 | spin_unlock(&journal->j_list_lock); |
| 1026 | |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 1027 | if (journal->j_commit_callback) |
| 1028 | journal->j_commit_callback(journal, commit_transaction); |
| 1029 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 1030 | trace_jbd2_end_commit(journal, commit_transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1031 | jbd_debug(1, "JBD: commit %d complete, head %d\n", |
| 1032 | journal->j_commit_sequence, journal->j_tail_sequence); |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 1033 | if (to_free) |
| 1034 | kfree(commit_transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1035 | |
| 1036 | wake_up(&journal->j_wait_done_commit); |
| 1037 | } |