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/journal.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 | * Generic filesystem journal-writing code; part of the ext2fs |
| 13 | * journaling system. |
| 14 | * |
| 15 | * This file manages journals: areas of disk reserved for logging |
| 16 | * transactional updates. This includes the kernel journaling thread |
| 17 | * which is responsible for scheduling updates to the log. |
| 18 | * |
| 19 | * We do not actually manage the physical storage of the journal in this |
| 20 | * file: that is left to a per-journal policy function, which allows us |
| 21 | * to store the journal within a filesystem-specified area for ext2 |
| 22 | * journaling (ext2 can use a reserved inode for storing the log). |
| 23 | */ |
| 24 | |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/time.h> |
| 27 | #include <linux/fs.h> |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 28 | #include <linux/jbd2.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 29 | #include <linux/errno.h> |
| 30 | #include <linux/slab.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 31 | #include <linux/init.h> |
| 32 | #include <linux/mm.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 33 | #include <linux/freezer.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 34 | #include <linux/pagemap.h> |
| 35 | #include <linux/kthread.h> |
| 36 | #include <linux/poison.h> |
| 37 | #include <linux/proc_fs.h> |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 38 | #include <linux/debugfs.h> |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 39 | #include <linux/seq_file.h> |
Simon Holm Thøgersen | c225aa5 | 2009-01-11 22:34:01 -0500 | [diff] [blame] | 40 | #include <linux/math64.h> |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 41 | #include <linux/hash.h> |
Theodore Ts'o | d2eecb0 | 2009-12-07 10:36:20 -0500 | [diff] [blame] | 42 | #include <linux/log2.h> |
| 43 | #include <linux/vmalloc.h> |
Theodore Ts'o | 47def82 | 2010-07-27 11:56:05 -0400 | [diff] [blame] | 44 | #include <linux/backing-dev.h> |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 45 | |
| 46 | #define CREATE_TRACE_POINTS |
| 47 | #include <trace/events/jbd2.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 48 | |
| 49 | #include <asm/uaccess.h> |
| 50 | #include <asm/page.h> |
| 51 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 52 | EXPORT_SYMBOL(jbd2_journal_extend); |
| 53 | EXPORT_SYMBOL(jbd2_journal_stop); |
| 54 | EXPORT_SYMBOL(jbd2_journal_lock_updates); |
| 55 | EXPORT_SYMBOL(jbd2_journal_unlock_updates); |
| 56 | EXPORT_SYMBOL(jbd2_journal_get_write_access); |
| 57 | EXPORT_SYMBOL(jbd2_journal_get_create_access); |
| 58 | EXPORT_SYMBOL(jbd2_journal_get_undo_access); |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 59 | EXPORT_SYMBOL(jbd2_journal_set_triggers); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 60 | EXPORT_SYMBOL(jbd2_journal_dirty_metadata); |
| 61 | EXPORT_SYMBOL(jbd2_journal_release_buffer); |
| 62 | EXPORT_SYMBOL(jbd2_journal_forget); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 63 | #if 0 |
| 64 | EXPORT_SYMBOL(journal_sync_buffer); |
| 65 | #endif |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 66 | EXPORT_SYMBOL(jbd2_journal_flush); |
| 67 | EXPORT_SYMBOL(jbd2_journal_revoke); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 68 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 69 | EXPORT_SYMBOL(jbd2_journal_init_dev); |
| 70 | EXPORT_SYMBOL(jbd2_journal_init_inode); |
| 71 | EXPORT_SYMBOL(jbd2_journal_update_format); |
| 72 | EXPORT_SYMBOL(jbd2_journal_check_used_features); |
| 73 | EXPORT_SYMBOL(jbd2_journal_check_available_features); |
| 74 | EXPORT_SYMBOL(jbd2_journal_set_features); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 75 | EXPORT_SYMBOL(jbd2_journal_load); |
| 76 | EXPORT_SYMBOL(jbd2_journal_destroy); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 77 | EXPORT_SYMBOL(jbd2_journal_abort); |
| 78 | EXPORT_SYMBOL(jbd2_journal_errno); |
| 79 | EXPORT_SYMBOL(jbd2_journal_ack_err); |
| 80 | EXPORT_SYMBOL(jbd2_journal_clear_err); |
| 81 | EXPORT_SYMBOL(jbd2_log_wait_commit); |
Theodore Ts'o | 3b799d1 | 2009-12-09 20:42:53 -0500 | [diff] [blame] | 82 | EXPORT_SYMBOL(jbd2_log_start_commit); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 83 | EXPORT_SYMBOL(jbd2_journal_start_commit); |
| 84 | EXPORT_SYMBOL(jbd2_journal_force_commit_nested); |
| 85 | EXPORT_SYMBOL(jbd2_journal_wipe); |
| 86 | EXPORT_SYMBOL(jbd2_journal_blocks_per_page); |
| 87 | EXPORT_SYMBOL(jbd2_journal_invalidatepage); |
| 88 | EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers); |
| 89 | EXPORT_SYMBOL(jbd2_journal_force_commit); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 90 | EXPORT_SYMBOL(jbd2_journal_file_inode); |
| 91 | EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); |
| 92 | EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); |
| 93 | EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 94 | |
| 95 | static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *); |
| 96 | static void __journal_abort_soft (journal_t *journal, int errno); |
Theodore Ts'o | d2eecb0 | 2009-12-07 10:36:20 -0500 | [diff] [blame] | 97 | static int jbd2_journal_create_slab(size_t slab_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 98 | |
| 99 | /* |
| 100 | * Helper function used to manage commit timeouts |
| 101 | */ |
| 102 | |
| 103 | static void commit_timeout(unsigned long __data) |
| 104 | { |
| 105 | struct task_struct * p = (struct task_struct *) __data; |
| 106 | |
| 107 | wake_up_process(p); |
| 108 | } |
| 109 | |
| 110 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 111 | * kjournald2: The main thread function used to manage a logging device |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 112 | * journal. |
| 113 | * |
| 114 | * This kernel thread is responsible for two things: |
| 115 | * |
| 116 | * 1) COMMIT: Every so often we need to commit the current state of the |
| 117 | * filesystem to disk. The journal thread is responsible for writing |
| 118 | * all of the metadata buffers to disk. |
| 119 | * |
| 120 | * 2) CHECKPOINT: We cannot reuse a used section of the log file until all |
| 121 | * of the data in that part of the log has been rewritten elsewhere on |
| 122 | * the disk. Flushing these old buffers to reclaim space in the log is |
| 123 | * known as checkpointing, and this thread is responsible for that job. |
| 124 | */ |
| 125 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 126 | static int kjournald2(void *arg) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 127 | { |
| 128 | journal_t *journal = arg; |
| 129 | transaction_t *transaction; |
| 130 | |
| 131 | /* |
| 132 | * Set up an interval timer which can be used to trigger a commit wakeup |
| 133 | * after the commit interval expires |
| 134 | */ |
| 135 | setup_timer(&journal->j_commit_timer, commit_timeout, |
| 136 | (unsigned long)current); |
| 137 | |
| 138 | /* Record that the journal thread is running */ |
| 139 | journal->j_task = current; |
| 140 | wake_up(&journal->j_wait_done_commit); |
| 141 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 142 | /* |
| 143 | * And now, wait forever for commit wakeup events. |
| 144 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 145 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 146 | |
| 147 | loop: |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 148 | if (journal->j_flags & JBD2_UNMOUNT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 149 | goto end_loop; |
| 150 | |
| 151 | jbd_debug(1, "commit_sequence=%d, commit_request=%d\n", |
| 152 | journal->j_commit_sequence, journal->j_commit_request); |
| 153 | |
| 154 | if (journal->j_commit_sequence != journal->j_commit_request) { |
| 155 | jbd_debug(1, "OK, requests differ\n"); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 156 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 157 | del_timer_sync(&journal->j_commit_timer); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 158 | jbd2_journal_commit_transaction(journal); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 159 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 160 | goto loop; |
| 161 | } |
| 162 | |
| 163 | wake_up(&journal->j_wait_done_commit); |
| 164 | if (freezing(current)) { |
| 165 | /* |
| 166 | * The simpler the better. Flushing journal isn't a |
| 167 | * good idea, because that depends on threads that may |
| 168 | * be already stopped. |
| 169 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 170 | jbd_debug(1, "Now suspending kjournald2\n"); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 171 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 172 | refrigerator(); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 173 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 174 | } else { |
| 175 | /* |
| 176 | * We assume on resume that commits are already there, |
| 177 | * so we don't sleep |
| 178 | */ |
| 179 | DEFINE_WAIT(wait); |
| 180 | int should_sleep = 1; |
| 181 | |
| 182 | prepare_to_wait(&journal->j_wait_commit, &wait, |
| 183 | TASK_INTERRUPTIBLE); |
| 184 | if (journal->j_commit_sequence != journal->j_commit_request) |
| 185 | should_sleep = 0; |
| 186 | transaction = journal->j_running_transaction; |
| 187 | if (transaction && time_after_eq(jiffies, |
| 188 | transaction->t_expires)) |
| 189 | should_sleep = 0; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 190 | if (journal->j_flags & JBD2_UNMOUNT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 191 | should_sleep = 0; |
| 192 | if (should_sleep) { |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 193 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 194 | schedule(); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 195 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 196 | } |
| 197 | finish_wait(&journal->j_wait_commit, &wait); |
| 198 | } |
| 199 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 200 | jbd_debug(1, "kjournald2 wakes\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 201 | |
| 202 | /* |
| 203 | * Were we woken up by a commit wakeup event? |
| 204 | */ |
| 205 | transaction = journal->j_running_transaction; |
| 206 | if (transaction && time_after_eq(jiffies, transaction->t_expires)) { |
| 207 | journal->j_commit_request = transaction->t_tid; |
| 208 | jbd_debug(1, "woke because of timeout\n"); |
| 209 | } |
| 210 | goto loop; |
| 211 | |
| 212 | end_loop: |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 213 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 214 | del_timer_sync(&journal->j_commit_timer); |
| 215 | journal->j_task = NULL; |
| 216 | wake_up(&journal->j_wait_done_commit); |
| 217 | jbd_debug(1, "Journal thread exiting.\n"); |
| 218 | return 0; |
| 219 | } |
| 220 | |
Pavel Emelianov | 97f0678 | 2007-05-08 00:30:42 -0700 | [diff] [blame] | 221 | static int jbd2_journal_start_thread(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 222 | { |
Pavel Emelianov | 97f0678 | 2007-05-08 00:30:42 -0700 | [diff] [blame] | 223 | struct task_struct *t; |
| 224 | |
Theodore Ts'o | 90576c0 | 2009-09-29 15:51:30 -0400 | [diff] [blame] | 225 | t = kthread_run(kjournald2, journal, "jbd2/%s", |
| 226 | journal->j_devname); |
Pavel Emelianov | 97f0678 | 2007-05-08 00:30:42 -0700 | [diff] [blame] | 227 | if (IS_ERR(t)) |
| 228 | return PTR_ERR(t); |
| 229 | |
Al Viro | 1076d17 | 2008-03-29 03:07:18 +0000 | [diff] [blame] | 230 | wait_event(journal->j_wait_done_commit, journal->j_task != NULL); |
Pavel Emelianov | 97f0678 | 2007-05-08 00:30:42 -0700 | [diff] [blame] | 231 | return 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | static void journal_kill_thread(journal_t *journal) |
| 235 | { |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 236 | write_lock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 237 | journal->j_flags |= JBD2_UNMOUNT; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 238 | |
| 239 | while (journal->j_task) { |
| 240 | wake_up(&journal->j_wait_commit); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 241 | write_unlock(&journal->j_state_lock); |
Al Viro | 1076d17 | 2008-03-29 03:07:18 +0000 | [diff] [blame] | 242 | wait_event(journal->j_wait_done_commit, journal->j_task == NULL); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 243 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 244 | } |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 245 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 249 | * jbd2_journal_write_metadata_buffer: write a metadata buffer to the journal. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 250 | * |
| 251 | * Writes a metadata buffer to a given disk block. The actual IO is not |
| 252 | * performed but a new buffer_head is constructed which labels the data |
| 253 | * to be written with the correct destination disk block. |
| 254 | * |
| 255 | * Any magic-number escaping which needs to be done will cause a |
| 256 | * copy-out here. If the buffer happens to start with the |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 257 | * JBD2_MAGIC_NUMBER, then we can't write it to the log directly: the |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 258 | * magic number is only written to the log for descripter blocks. In |
| 259 | * this case, we copy the data and replace the first word with 0, and we |
| 260 | * return a result code which indicates that this buffer needs to be |
| 261 | * marked as an escaped buffer in the corresponding log descriptor |
| 262 | * block. The missing word can then be restored when the block is read |
| 263 | * during recovery. |
| 264 | * |
| 265 | * If the source buffer has already been modified by a new transaction |
| 266 | * since we took the last commit snapshot, we use the frozen copy of |
| 267 | * that data for IO. If we end up using the existing buffer_head's data |
| 268 | * for the write, then we *have* to lock the buffer to prevent anyone |
| 269 | * else from using and possibly modifying it while the IO is in |
| 270 | * progress. |
| 271 | * |
| 272 | * The function returns a pointer to the buffer_heads to be used for IO. |
| 273 | * |
| 274 | * We assume that the journal has already been locked in this function. |
| 275 | * |
| 276 | * Return value: |
| 277 | * <0: Error |
| 278 | * >=0: Finished OK |
| 279 | * |
| 280 | * On success: |
| 281 | * Bit 0 set == escape performed on the data |
| 282 | * Bit 1 set == buffer copy-out performed (kfree the data after IO) |
| 283 | */ |
| 284 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 285 | int jbd2_journal_write_metadata_buffer(transaction_t *transaction, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 286 | struct journal_head *jh_in, |
| 287 | struct journal_head **jh_out, |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 288 | unsigned long long blocknr) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 289 | { |
| 290 | int need_copy_out = 0; |
| 291 | int done_copy_out = 0; |
| 292 | int do_escape = 0; |
| 293 | char *mapped_data; |
| 294 | struct buffer_head *new_bh; |
| 295 | struct journal_head *new_jh; |
| 296 | struct page *new_page; |
| 297 | unsigned int new_offset; |
| 298 | struct buffer_head *bh_in = jh2bh(jh_in); |
dingdinghua | 96577c4 | 2009-07-13 17:55:35 -0400 | [diff] [blame] | 299 | journal_t *journal = transaction->t_journal; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 300 | |
| 301 | /* |
| 302 | * The buffer really shouldn't be locked: only the current committing |
| 303 | * transaction is allowed to write it, so nobody else is allowed |
| 304 | * to do any IO. |
| 305 | * |
| 306 | * akpm: except if we're journalling data, and write() output is |
| 307 | * also part of a shared mapping, and another thread has |
| 308 | * decided to launch a writepage() against this buffer. |
| 309 | */ |
| 310 | J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in)); |
| 311 | |
Theodore Ts'o | 47def82 | 2010-07-27 11:56:05 -0400 | [diff] [blame] | 312 | retry_alloc: |
| 313 | new_bh = alloc_buffer_head(GFP_NOFS); |
| 314 | if (!new_bh) { |
| 315 | /* |
| 316 | * Failure is not an option, but __GFP_NOFAIL is going |
| 317 | * away; so we retry ourselves here. |
| 318 | */ |
| 319 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
| 320 | goto retry_alloc; |
| 321 | } |
| 322 | |
dingdinghua | 96577c4 | 2009-07-13 17:55:35 -0400 | [diff] [blame] | 323 | /* keep subsequent assertions sane */ |
| 324 | new_bh->b_state = 0; |
| 325 | init_buffer(new_bh, NULL, NULL); |
| 326 | atomic_set(&new_bh->b_count, 1); |
| 327 | new_jh = jbd2_journal_add_journal_head(new_bh); /* This sleeps */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 328 | |
| 329 | /* |
| 330 | * If a new transaction has already done a buffer copy-out, then |
| 331 | * we use that version of the data for the commit. |
| 332 | */ |
| 333 | jbd_lock_bh_state(bh_in); |
| 334 | repeat: |
| 335 | if (jh_in->b_frozen_data) { |
| 336 | done_copy_out = 1; |
| 337 | new_page = virt_to_page(jh_in->b_frozen_data); |
| 338 | new_offset = offset_in_page(jh_in->b_frozen_data); |
| 339 | } else { |
| 340 | new_page = jh2bh(jh_in)->b_page; |
| 341 | new_offset = offset_in_page(jh2bh(jh_in)->b_data); |
| 342 | } |
| 343 | |
| 344 | mapped_data = kmap_atomic(new_page, KM_USER0); |
| 345 | /* |
Jan Kara | 13ceef0 | 2010-07-14 07:56:33 +0200 | [diff] [blame] | 346 | * Fire data frozen trigger if data already wasn't frozen. Do this |
| 347 | * before checking for escaping, as the trigger may modify the magic |
| 348 | * offset. If a copy-out happens afterwards, it will have the correct |
| 349 | * data in the buffer. |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 350 | */ |
Jan Kara | 13ceef0 | 2010-07-14 07:56:33 +0200 | [diff] [blame] | 351 | if (!done_copy_out) |
| 352 | jbd2_buffer_frozen_trigger(jh_in, mapped_data + new_offset, |
| 353 | jh_in->b_triggers); |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 354 | |
| 355 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 356 | * Check for escaping |
| 357 | */ |
| 358 | if (*((__be32 *)(mapped_data + new_offset)) == |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 359 | cpu_to_be32(JBD2_MAGIC_NUMBER)) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 360 | need_copy_out = 1; |
| 361 | do_escape = 1; |
| 362 | } |
| 363 | kunmap_atomic(mapped_data, KM_USER0); |
| 364 | |
| 365 | /* |
| 366 | * Do we need to do a data copy? |
| 367 | */ |
| 368 | if (need_copy_out && !done_copy_out) { |
| 369 | char *tmp; |
| 370 | |
| 371 | jbd_unlock_bh_state(bh_in); |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 372 | tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS); |
Theodore Ts'o | e6ec116 | 2009-12-01 09:04:42 -0500 | [diff] [blame] | 373 | if (!tmp) { |
| 374 | jbd2_journal_put_journal_head(new_jh); |
| 375 | return -ENOMEM; |
| 376 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 377 | jbd_lock_bh_state(bh_in); |
| 378 | if (jh_in->b_frozen_data) { |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 379 | jbd2_free(tmp, bh_in->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 380 | goto repeat; |
| 381 | } |
| 382 | |
| 383 | jh_in->b_frozen_data = tmp; |
| 384 | mapped_data = kmap_atomic(new_page, KM_USER0); |
| 385 | memcpy(tmp, mapped_data + new_offset, jh2bh(jh_in)->b_size); |
| 386 | kunmap_atomic(mapped_data, KM_USER0); |
| 387 | |
| 388 | new_page = virt_to_page(tmp); |
| 389 | new_offset = offset_in_page(tmp); |
| 390 | done_copy_out = 1; |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 391 | |
| 392 | /* |
| 393 | * This isn't strictly necessary, as we're using frozen |
| 394 | * data for the escaping, but it keeps consistency with |
| 395 | * b_frozen_data usage. |
| 396 | */ |
| 397 | jh_in->b_frozen_triggers = jh_in->b_triggers; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Did we need to do an escaping? Now we've done all the |
| 402 | * copying, we can finally do so. |
| 403 | */ |
| 404 | if (do_escape) { |
| 405 | mapped_data = kmap_atomic(new_page, KM_USER0); |
| 406 | *((unsigned int *)(mapped_data + new_offset)) = 0; |
| 407 | kunmap_atomic(mapped_data, KM_USER0); |
| 408 | } |
| 409 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 410 | set_bh_page(new_bh, new_page, new_offset); |
| 411 | new_jh->b_transaction = NULL; |
| 412 | new_bh->b_size = jh2bh(jh_in)->b_size; |
| 413 | new_bh->b_bdev = transaction->t_journal->j_dev; |
| 414 | new_bh->b_blocknr = blocknr; |
| 415 | set_buffer_mapped(new_bh); |
| 416 | set_buffer_dirty(new_bh); |
| 417 | |
| 418 | *jh_out = new_jh; |
| 419 | |
| 420 | /* |
| 421 | * The to-be-written buffer needs to get moved to the io queue, |
| 422 | * and the original buffer whose contents we are shadowing or |
| 423 | * copying is moved to the transaction's shadow queue. |
| 424 | */ |
| 425 | JBUFFER_TRACE(jh_in, "file as BJ_Shadow"); |
dingdinghua | 96577c4 | 2009-07-13 17:55:35 -0400 | [diff] [blame] | 426 | spin_lock(&journal->j_list_lock); |
| 427 | __jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow); |
| 428 | spin_unlock(&journal->j_list_lock); |
| 429 | jbd_unlock_bh_state(bh_in); |
| 430 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 431 | JBUFFER_TRACE(new_jh, "file as BJ_IO"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 432 | jbd2_journal_file_buffer(new_jh, transaction, BJ_IO); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 433 | |
| 434 | return do_escape | (done_copy_out << 1); |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Allocation code for the journal file. Manage the space left in the |
| 439 | * journal, so that we can begin checkpointing when appropriate. |
| 440 | */ |
| 441 | |
| 442 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 443 | * __jbd2_log_space_left: Return the number of free blocks left in the journal. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 444 | * |
| 445 | * Called with the journal already locked. |
| 446 | * |
| 447 | * Called under j_state_lock |
| 448 | */ |
| 449 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 450 | int __jbd2_log_space_left(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 451 | { |
| 452 | int left = journal->j_free; |
| 453 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 454 | /* assert_spin_locked(&journal->j_state_lock); */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 455 | |
| 456 | /* |
| 457 | * Be pessimistic here about the number of those free blocks which |
| 458 | * might be required for log descriptor control blocks. |
| 459 | */ |
| 460 | |
| 461 | #define MIN_LOG_RESERVED_BLOCKS 32 /* Allow for rounding errors */ |
| 462 | |
| 463 | left -= MIN_LOG_RESERVED_BLOCKS; |
| 464 | |
| 465 | if (left <= 0) |
| 466 | return 0; |
| 467 | left -= (left >> 3); |
| 468 | return left; |
| 469 | } |
| 470 | |
| 471 | /* |
Jan Kara | c88ccea | 2009-02-10 11:27:46 -0500 | [diff] [blame] | 472 | * Called under j_state_lock. Returns true if a transaction commit was started. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 473 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 474 | int __jbd2_log_start_commit(journal_t *journal, tid_t target) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 475 | { |
| 476 | /* |
| 477 | * Are we already doing a recent enough commit? |
| 478 | */ |
| 479 | if (!tid_geq(journal->j_commit_request, target)) { |
| 480 | /* |
| 481 | * We want a new commit: OK, mark the request and wakup the |
| 482 | * commit thread. We do _not_ do the commit ourselves. |
| 483 | */ |
| 484 | |
| 485 | journal->j_commit_request = target; |
| 486 | jbd_debug(1, "JBD: requesting commit %d/%d\n", |
| 487 | journal->j_commit_request, |
| 488 | journal->j_commit_sequence); |
| 489 | wake_up(&journal->j_wait_commit); |
| 490 | return 1; |
| 491 | } |
| 492 | return 0; |
| 493 | } |
| 494 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 495 | int jbd2_log_start_commit(journal_t *journal, tid_t tid) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 496 | { |
| 497 | int ret; |
| 498 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 499 | write_lock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 500 | ret = __jbd2_log_start_commit(journal, tid); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 501 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 502 | return ret; |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * Force and wait upon a commit if the calling process is not within |
| 507 | * transaction. This is used for forcing out undo-protected data which contains |
| 508 | * bitmaps, when the fs is running out of space. |
| 509 | * |
| 510 | * We can only force the running transaction if we don't have an active handle; |
| 511 | * otherwise, we will deadlock. |
| 512 | * |
| 513 | * Returns true if a transaction was started. |
| 514 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 515 | int jbd2_journal_force_commit_nested(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 516 | { |
| 517 | transaction_t *transaction = NULL; |
| 518 | tid_t tid; |
| 519 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 520 | read_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 521 | if (journal->j_running_transaction && !current->journal_info) { |
| 522 | transaction = journal->j_running_transaction; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 523 | __jbd2_log_start_commit(journal, transaction->t_tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 524 | } else if (journal->j_committing_transaction) |
| 525 | transaction = journal->j_committing_transaction; |
| 526 | |
| 527 | if (!transaction) { |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 528 | read_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 529 | return 0; /* Nothing to retry */ |
| 530 | } |
| 531 | |
| 532 | tid = transaction->t_tid; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 533 | read_unlock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 534 | jbd2_log_wait_commit(journal, tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 535 | return 1; |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Start a commit of the current running transaction (if any). Returns true |
Jan Kara | c88ccea | 2009-02-10 11:27:46 -0500 | [diff] [blame] | 540 | * if a transaction is going to be committed (or is currently already |
| 541 | * committing), and fills its tid in at *ptid |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 542 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 543 | int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 544 | { |
| 545 | int ret = 0; |
| 546 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 547 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 548 | if (journal->j_running_transaction) { |
| 549 | tid_t tid = journal->j_running_transaction->t_tid; |
| 550 | |
Jan Kara | c88ccea | 2009-02-10 11:27:46 -0500 | [diff] [blame] | 551 | __jbd2_log_start_commit(journal, tid); |
| 552 | /* There's a running transaction and we've just made sure |
| 553 | * it's commit has been scheduled. */ |
| 554 | if (ptid) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 555 | *ptid = tid; |
Jan Kara | c88ccea | 2009-02-10 11:27:46 -0500 | [diff] [blame] | 556 | ret = 1; |
| 557 | } else if (journal->j_committing_transaction) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 558 | /* |
| 559 | * If ext3_write_super() recently started a commit, then we |
| 560 | * have to wait for completion of that transaction |
| 561 | */ |
Jan Kara | c88ccea | 2009-02-10 11:27:46 -0500 | [diff] [blame] | 562 | if (ptid) |
| 563 | *ptid = journal->j_committing_transaction->t_tid; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 564 | ret = 1; |
| 565 | } |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 566 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 567 | return ret; |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | * Wait for a specified commit to complete. |
| 572 | * The caller may not hold the journal lock. |
| 573 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 574 | int jbd2_log_wait_commit(journal_t *journal, tid_t tid) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 575 | { |
| 576 | int err = 0; |
| 577 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 578 | read_lock(&journal->j_state_lock); |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 579 | #ifdef CONFIG_JBD2_DEBUG |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 580 | if (!tid_geq(journal->j_commit_request, tid)) { |
| 581 | printk(KERN_EMERG |
| 582 | "%s: error: j_commit_request=%d, tid=%d\n", |
Harvey Harrison | 329d291 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 583 | __func__, journal->j_commit_request, tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 584 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 585 | #endif |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 586 | while (tid_gt(tid, journal->j_commit_sequence)) { |
| 587 | jbd_debug(1, "JBD: want %d, j_commit_sequence=%d\n", |
| 588 | tid, journal->j_commit_sequence); |
| 589 | wake_up(&journal->j_wait_commit); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 590 | read_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 591 | wait_event(journal->j_wait_done_commit, |
| 592 | !tid_gt(tid, journal->j_commit_sequence)); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 593 | read_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 594 | } |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 595 | read_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 596 | |
| 597 | if (unlikely(is_journal_aborted(journal))) { |
| 598 | printk(KERN_EMERG "journal commit I/O error\n"); |
| 599 | err = -EIO; |
| 600 | } |
| 601 | return err; |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Log buffer allocation routines: |
| 606 | */ |
| 607 | |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 608 | int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 609 | { |
| 610 | unsigned long blocknr; |
| 611 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 612 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 613 | J_ASSERT(journal->j_free > 1); |
| 614 | |
| 615 | blocknr = journal->j_head; |
| 616 | journal->j_head++; |
| 617 | journal->j_free--; |
| 618 | if (journal->j_head == journal->j_last) |
| 619 | journal->j_head = journal->j_first; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 620 | write_unlock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 621 | return jbd2_journal_bmap(journal, blocknr, retp); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | /* |
| 625 | * Conversion of logical to physical block numbers for the journal |
| 626 | * |
| 627 | * On external journals the journal blocks are identity-mapped, so |
| 628 | * this is a no-op. If needed, we can use j_blk_offset - everything is |
| 629 | * ready. |
| 630 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 631 | int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 632 | unsigned long long *retp) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 633 | { |
| 634 | int err = 0; |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 635 | unsigned long long ret; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 636 | |
| 637 | if (journal->j_inode) { |
| 638 | ret = bmap(journal->j_inode, blocknr); |
| 639 | if (ret) |
| 640 | *retp = ret; |
| 641 | else { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 642 | printk(KERN_ALERT "%s: journal block not found " |
| 643 | "at offset %lu on %s\n", |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 644 | __func__, blocknr, journal->j_devname); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 645 | err = -EIO; |
| 646 | __journal_abort_soft(journal, err); |
| 647 | } |
| 648 | } else { |
| 649 | *retp = blocknr; /* +journal->j_blk_offset */ |
| 650 | } |
| 651 | return err; |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * We play buffer_head aliasing tricks to write data/metadata blocks to |
| 656 | * the journal without copying their contents, but for journal |
| 657 | * descriptor blocks we do need to generate bona fide buffers. |
| 658 | * |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 659 | * After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 660 | * the buffer's contents they really should run flush_dcache_page(bh->b_page). |
| 661 | * But we don't bother doing that, so there will be coherency problems with |
| 662 | * mmaps of blockdevs which hold live JBD-controlled filesystems. |
| 663 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 664 | struct journal_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 665 | { |
| 666 | struct buffer_head *bh; |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 667 | unsigned long long blocknr; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 668 | int err; |
| 669 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 670 | err = jbd2_journal_next_log_block(journal, &blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 671 | |
| 672 | if (err) |
| 673 | return NULL; |
| 674 | |
| 675 | bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 676 | if (!bh) |
| 677 | return NULL; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 678 | lock_buffer(bh); |
| 679 | memset(bh->b_data, 0, journal->j_blocksize); |
| 680 | set_buffer_uptodate(bh); |
| 681 | unlock_buffer(bh); |
| 682 | BUFFER_TRACE(bh, "return this buffer"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 683 | return jbd2_journal_add_journal_head(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 686 | struct jbd2_stats_proc_session { |
| 687 | journal_t *journal; |
| 688 | struct transaction_stats_s *stats; |
| 689 | int start; |
| 690 | int max; |
| 691 | }; |
| 692 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 693 | static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) |
| 694 | { |
| 695 | return *pos ? NULL : SEQ_START_TOKEN; |
| 696 | } |
| 697 | |
| 698 | static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) |
| 699 | { |
| 700 | return NULL; |
| 701 | } |
| 702 | |
| 703 | static int jbd2_seq_info_show(struct seq_file *seq, void *v) |
| 704 | { |
| 705 | struct jbd2_stats_proc_session *s = seq->private; |
| 706 | |
| 707 | if (v != SEQ_START_TOKEN) |
| 708 | return 0; |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 709 | seq_printf(seq, "%lu transaction, each up to %u blocks\n", |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 710 | s->stats->ts_tid, |
| 711 | s->journal->j_max_transaction_buffers); |
| 712 | if (s->stats->ts_tid == 0) |
| 713 | return 0; |
| 714 | seq_printf(seq, "average: \n %ums waiting for transaction\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 715 | jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 716 | seq_printf(seq, " %ums running transaction\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 717 | jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 718 | seq_printf(seq, " %ums transaction was being locked\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 719 | jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 720 | seq_printf(seq, " %ums flushing data (in ordered mode)\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 721 | jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 722 | seq_printf(seq, " %ums logging transaction\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 723 | jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); |
Simon Holm Thøgersen | c225aa5 | 2009-01-11 22:34:01 -0500 | [diff] [blame] | 724 | seq_printf(seq, " %lluus average transaction commit time\n", |
| 725 | div_u64(s->journal->j_average_commit_time, 1000)); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 726 | seq_printf(seq, " %lu handles per transaction\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 727 | s->stats->run.rs_handle_count / s->stats->ts_tid); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 728 | seq_printf(seq, " %lu blocks per transaction\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 729 | s->stats->run.rs_blocks / s->stats->ts_tid); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 730 | seq_printf(seq, " %lu logged blocks per transaction\n", |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 731 | s->stats->run.rs_blocks_logged / s->stats->ts_tid); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 732 | return 0; |
| 733 | } |
| 734 | |
| 735 | static void jbd2_seq_info_stop(struct seq_file *seq, void *v) |
| 736 | { |
| 737 | } |
| 738 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 739 | static const struct seq_operations jbd2_seq_info_ops = { |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 740 | .start = jbd2_seq_info_start, |
| 741 | .next = jbd2_seq_info_next, |
| 742 | .stop = jbd2_seq_info_stop, |
| 743 | .show = jbd2_seq_info_show, |
| 744 | }; |
| 745 | |
| 746 | static int jbd2_seq_info_open(struct inode *inode, struct file *file) |
| 747 | { |
| 748 | journal_t *journal = PDE(inode)->data; |
| 749 | struct jbd2_stats_proc_session *s; |
| 750 | int rc, size; |
| 751 | |
| 752 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 753 | if (s == NULL) |
| 754 | return -ENOMEM; |
| 755 | size = sizeof(struct transaction_stats_s); |
| 756 | s->stats = kmalloc(size, GFP_KERNEL); |
| 757 | if (s->stats == NULL) { |
| 758 | kfree(s); |
| 759 | return -ENOMEM; |
| 760 | } |
| 761 | spin_lock(&journal->j_history_lock); |
| 762 | memcpy(s->stats, &journal->j_stats, size); |
| 763 | s->journal = journal; |
| 764 | spin_unlock(&journal->j_history_lock); |
| 765 | |
| 766 | rc = seq_open(file, &jbd2_seq_info_ops); |
| 767 | if (rc == 0) { |
| 768 | struct seq_file *m = file->private_data; |
| 769 | m->private = s; |
| 770 | } else { |
| 771 | kfree(s->stats); |
| 772 | kfree(s); |
| 773 | } |
| 774 | return rc; |
| 775 | |
| 776 | } |
| 777 | |
| 778 | static int jbd2_seq_info_release(struct inode *inode, struct file *file) |
| 779 | { |
| 780 | struct seq_file *seq = file->private_data; |
| 781 | struct jbd2_stats_proc_session *s = seq->private; |
| 782 | kfree(s->stats); |
| 783 | kfree(s); |
| 784 | return seq_release(inode, file); |
| 785 | } |
| 786 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 787 | static const struct file_operations jbd2_seq_info_fops = { |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 788 | .owner = THIS_MODULE, |
| 789 | .open = jbd2_seq_info_open, |
| 790 | .read = seq_read, |
| 791 | .llseek = seq_lseek, |
| 792 | .release = jbd2_seq_info_release, |
| 793 | }; |
| 794 | |
| 795 | static struct proc_dir_entry *proc_jbd2_stats; |
| 796 | |
| 797 | static void jbd2_stats_proc_init(journal_t *journal) |
| 798 | { |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 799 | journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 800 | if (journal->j_proc_entry) { |
Denis V. Lunev | 79da366 | 2008-04-29 01:02:11 -0700 | [diff] [blame] | 801 | proc_create_data("info", S_IRUGO, journal->j_proc_entry, |
| 802 | &jbd2_seq_info_fops, journal); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 803 | } |
| 804 | } |
| 805 | |
| 806 | static void jbd2_stats_proc_exit(journal_t *journal) |
| 807 | { |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 808 | remove_proc_entry("info", journal->j_proc_entry); |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 809 | remove_proc_entry(journal->j_devname, proc_jbd2_stats); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 810 | } |
| 811 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 812 | /* |
| 813 | * Management for journal control blocks: functions to create and |
| 814 | * destroy journal_t structures, and to initialise and read existing |
| 815 | * journal blocks from disk. */ |
| 816 | |
| 817 | /* First: create and setup a journal_t object in memory. We initialise |
| 818 | * very few fields yet: that has to wait until we have created the |
| 819 | * journal structures from from scratch, or loaded them from disk. */ |
| 820 | |
| 821 | static journal_t * journal_init_common (void) |
| 822 | { |
| 823 | journal_t *journal; |
| 824 | int err; |
| 825 | |
Andrew Morton | 3ebfdf8 | 2009-12-23 08:05:15 -0500 | [diff] [blame] | 826 | journal = kzalloc(sizeof(*journal), GFP_KERNEL); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 827 | if (!journal) |
| 828 | goto fail; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 829 | |
| 830 | init_waitqueue_head(&journal->j_wait_transaction_locked); |
| 831 | init_waitqueue_head(&journal->j_wait_logspace); |
| 832 | init_waitqueue_head(&journal->j_wait_done_commit); |
| 833 | init_waitqueue_head(&journal->j_wait_checkpoint); |
| 834 | init_waitqueue_head(&journal->j_wait_commit); |
| 835 | init_waitqueue_head(&journal->j_wait_updates); |
| 836 | mutex_init(&journal->j_barrier); |
| 837 | mutex_init(&journal->j_checkpoint_mutex); |
| 838 | spin_lock_init(&journal->j_revoke_lock); |
| 839 | spin_lock_init(&journal->j_list_lock); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 840 | rwlock_init(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 841 | |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 842 | journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); |
Theodore Ts'o | 3077384 | 2009-01-03 20:27:38 -0500 | [diff] [blame] | 843 | journal->j_min_batch_time = 0; |
| 844 | journal->j_max_batch_time = 15000; /* 15ms */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 845 | |
| 846 | /* The journal is marked for error until we succeed with recovery! */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 847 | journal->j_flags = JBD2_ABORT; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 848 | |
| 849 | /* Set up a default-sized revoke table for the new mount. */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 850 | err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 851 | if (err) { |
| 852 | kfree(journal); |
| 853 | goto fail; |
| 854 | } |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 855 | |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 856 | spin_lock_init(&journal->j_history_lock); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 857 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 858 | return journal; |
| 859 | fail: |
| 860 | return NULL; |
| 861 | } |
| 862 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 863 | /* jbd2_journal_init_dev and jbd2_journal_init_inode: |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 864 | * |
| 865 | * Create a journal structure assigned some fixed set of disk blocks to |
| 866 | * the journal. We don't actually touch those disk blocks yet, but we |
| 867 | * need to set up all of the mapping information to tell the journaling |
| 868 | * system where the journal blocks are. |
| 869 | * |
| 870 | */ |
| 871 | |
| 872 | /** |
Randy Dunlap | 5648ba5 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 873 | * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 874 | * @bdev: Block device on which to create the journal |
| 875 | * @fs_dev: Device which hold journalled filesystem for this journal. |
| 876 | * @start: Block nr Start of journal. |
| 877 | * @len: Length of the journal in blocks. |
| 878 | * @blocksize: blocksize of journalling device |
Randy Dunlap | 5648ba5 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 879 | * |
| 880 | * Returns: a newly created journal_t * |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 881 | * |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 882 | * jbd2_journal_init_dev creates a journal which maps a fixed contiguous |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 883 | * range of blocks on an arbitrary block device. |
| 884 | * |
| 885 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 886 | journal_t * jbd2_journal_init_dev(struct block_device *bdev, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 887 | struct block_device *fs_dev, |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 888 | unsigned long long start, int len, int blocksize) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 889 | { |
| 890 | journal_t *journal = journal_init_common(); |
| 891 | struct buffer_head *bh; |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 892 | char *p; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 893 | int n; |
| 894 | |
| 895 | if (!journal) |
| 896 | return NULL; |
| 897 | |
| 898 | /* journal descriptor can store up to n blocks -bzzz */ |
| 899 | journal->j_blocksize = blocksize; |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 900 | jbd2_stats_proc_init(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 901 | n = journal->j_blocksize / sizeof(journal_block_tag_t); |
| 902 | journal->j_wbufsize = n; |
| 903 | journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); |
| 904 | if (!journal->j_wbuf) { |
| 905 | printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n", |
Harvey Harrison | 329d291 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 906 | __func__); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 907 | goto out_err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 908 | } |
| 909 | journal->j_dev = bdev; |
| 910 | journal->j_fs_dev = fs_dev; |
| 911 | journal->j_blk_offset = start; |
| 912 | journal->j_maxlen = len; |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 913 | bdevname(journal->j_dev, journal->j_devname); |
| 914 | p = journal->j_devname; |
| 915 | while ((p = strchr(p, '/'))) |
| 916 | *p = '!'; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 917 | |
| 918 | bh = __getblk(journal->j_dev, start, journal->j_blocksize); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 919 | if (!bh) { |
| 920 | printk(KERN_ERR |
| 921 | "%s: Cannot get buffer for journal superblock\n", |
| 922 | __func__); |
| 923 | goto out_err; |
| 924 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 925 | journal->j_sb_buffer = bh; |
| 926 | journal->j_superblock = (journal_superblock_t *)bh->b_data; |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 927 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 928 | return journal; |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 929 | out_err: |
Tao Ma | 7b02bec | 2009-11-10 17:13:22 +0800 | [diff] [blame] | 930 | kfree(journal->j_wbuf); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 931 | jbd2_stats_proc_exit(journal); |
| 932 | kfree(journal); |
| 933 | return NULL; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 934 | } |
| 935 | |
| 936 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 937 | * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 938 | * @inode: An inode to create the journal in |
| 939 | * |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 940 | * jbd2_journal_init_inode creates a journal which maps an on-disk inode as |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 941 | * the journal. The inode must exist already, must support bmap() and |
| 942 | * must have all data blocks preallocated. |
| 943 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 944 | journal_t * jbd2_journal_init_inode (struct inode *inode) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 945 | { |
| 946 | struct buffer_head *bh; |
| 947 | journal_t *journal = journal_init_common(); |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 948 | char *p; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 949 | int err; |
| 950 | int n; |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 951 | unsigned long long blocknr; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 952 | |
| 953 | if (!journal) |
| 954 | return NULL; |
| 955 | |
| 956 | journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; |
| 957 | journal->j_inode = inode; |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 958 | bdevname(journal->j_dev, journal->j_devname); |
| 959 | p = journal->j_devname; |
| 960 | while ((p = strchr(p, '/'))) |
| 961 | *p = '!'; |
| 962 | p = journal->j_devname + strlen(journal->j_devname); |
Theodore Ts'o | 90576c0 | 2009-09-29 15:51:30 -0400 | [diff] [blame] | 963 | sprintf(p, "-%lu", journal->j_inode->i_ino); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 964 | jbd_debug(1, |
| 965 | "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", |
| 966 | journal, inode->i_sb->s_id, inode->i_ino, |
| 967 | (long long) inode->i_size, |
| 968 | inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); |
| 969 | |
| 970 | journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; |
| 971 | journal->j_blocksize = inode->i_sb->s_blocksize; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 972 | jbd2_stats_proc_init(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 973 | |
| 974 | /* journal descriptor can store up to n blocks -bzzz */ |
| 975 | n = journal->j_blocksize / sizeof(journal_block_tag_t); |
| 976 | journal->j_wbufsize = n; |
| 977 | journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); |
| 978 | if (!journal->j_wbuf) { |
| 979 | printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n", |
Harvey Harrison | 329d291 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 980 | __func__); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 981 | goto out_err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 982 | } |
| 983 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 984 | err = jbd2_journal_bmap(journal, 0, &blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 985 | /* If that failed, give up */ |
| 986 | if (err) { |
| 987 | printk(KERN_ERR "%s: Cannnot locate journal superblock\n", |
Harvey Harrison | 329d291 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 988 | __func__); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 989 | goto out_err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 990 | } |
| 991 | |
| 992 | bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 993 | if (!bh) { |
| 994 | printk(KERN_ERR |
| 995 | "%s: Cannot get buffer for journal superblock\n", |
| 996 | __func__); |
| 997 | goto out_err; |
| 998 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 999 | journal->j_sb_buffer = bh; |
| 1000 | journal->j_superblock = (journal_superblock_t *)bh->b_data; |
| 1001 | |
| 1002 | return journal; |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 1003 | out_err: |
Tao Ma | 7b02bec | 2009-11-10 17:13:22 +0800 | [diff] [blame] | 1004 | kfree(journal->j_wbuf); |
Jan Kara | 4b90567 | 2009-01-06 14:53:35 -0500 | [diff] [blame] | 1005 | jbd2_stats_proc_exit(journal); |
| 1006 | kfree(journal); |
| 1007 | return NULL; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1008 | } |
| 1009 | |
| 1010 | /* |
| 1011 | * If the journal init or create aborts, we need to mark the journal |
| 1012 | * superblock as being NULL to prevent the journal destroy from writing |
| 1013 | * back a bogus superblock. |
| 1014 | */ |
| 1015 | static void journal_fail_superblock (journal_t *journal) |
| 1016 | { |
| 1017 | struct buffer_head *bh = journal->j_sb_buffer; |
| 1018 | brelse(bh); |
| 1019 | journal->j_sb_buffer = NULL; |
| 1020 | } |
| 1021 | |
| 1022 | /* |
| 1023 | * Given a journal_t structure, initialise the various fields for |
| 1024 | * startup of a new journaling session. We use this both when creating |
| 1025 | * a journal, and after recovering an old journal to reset it for |
| 1026 | * subsequent use. |
| 1027 | */ |
| 1028 | |
| 1029 | static int journal_reset(journal_t *journal) |
| 1030 | { |
| 1031 | journal_superblock_t *sb = journal->j_superblock; |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 1032 | unsigned long long first, last; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1033 | |
| 1034 | first = be32_to_cpu(sb->s_first); |
| 1035 | last = be32_to_cpu(sb->s_maxlen); |
Jan Kara | f6f50e2 | 2009-07-17 10:40:01 -0400 | [diff] [blame] | 1036 | if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { |
| 1037 | printk(KERN_ERR "JBD: Journal too short (blocks %llu-%llu).\n", |
| 1038 | first, last); |
| 1039 | journal_fail_superblock(journal); |
| 1040 | return -EINVAL; |
| 1041 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1042 | |
| 1043 | journal->j_first = first; |
| 1044 | journal->j_last = last; |
| 1045 | |
| 1046 | journal->j_head = first; |
| 1047 | journal->j_tail = first; |
| 1048 | journal->j_free = last - first; |
| 1049 | |
| 1050 | journal->j_tail_sequence = journal->j_transaction_sequence; |
| 1051 | journal->j_commit_sequence = journal->j_transaction_sequence - 1; |
| 1052 | journal->j_commit_request = journal->j_commit_sequence; |
| 1053 | |
| 1054 | journal->j_max_transaction_buffers = journal->j_maxlen / 4; |
| 1055 | |
| 1056 | /* Add the dynamic fields and write it to disk. */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1057 | jbd2_journal_update_superblock(journal, 1); |
Pavel Emelianov | 97f0678 | 2007-05-08 00:30:42 -0700 | [diff] [blame] | 1058 | return jbd2_journal_start_thread(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1059 | } |
| 1060 | |
| 1061 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1062 | * void jbd2_journal_update_superblock() - Update journal sb on disk. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1063 | * @journal: The journal to update. |
| 1064 | * @wait: Set to '0' if you don't want to wait for IO completion. |
| 1065 | * |
| 1066 | * Update a journal's dynamic superblock fields and write it to disk, |
| 1067 | * optionally waiting for the IO to complete. |
| 1068 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1069 | void jbd2_journal_update_superblock(journal_t *journal, int wait) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1070 | { |
| 1071 | journal_superblock_t *sb = journal->j_superblock; |
| 1072 | struct buffer_head *bh = journal->j_sb_buffer; |
| 1073 | |
| 1074 | /* |
| 1075 | * As a special case, if the on-disk copy is already marked as needing |
| 1076 | * no recovery (s_start == 0) and there are no outstanding transactions |
| 1077 | * in the filesystem, then we can safely defer the superblock update |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1078 | * until the next commit by setting JBD2_FLUSHED. This avoids |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1079 | * attempting a write to a potential-readonly device. |
| 1080 | */ |
| 1081 | if (sb->s_start == 0 && journal->j_tail_sequence == |
| 1082 | journal->j_transaction_sequence) { |
| 1083 | jbd_debug(1,"JBD: Skipping superblock update on recovered sb " |
| 1084 | "(start %ld, seq %d, errno %d)\n", |
| 1085 | journal->j_tail, journal->j_tail_sequence, |
| 1086 | journal->j_errno); |
| 1087 | goto out; |
| 1088 | } |
| 1089 | |
Theodore Ts'o | 914258b | 2008-10-06 21:35:40 -0400 | [diff] [blame] | 1090 | if (buffer_write_io_error(bh)) { |
| 1091 | /* |
| 1092 | * Oh, dear. A previous attempt to write the journal |
| 1093 | * superblock failed. This could happen because the |
| 1094 | * USB device was yanked out. Or it could happen to |
| 1095 | * be a transient write error and maybe the block will |
| 1096 | * be remapped. Nothing we can do but to retry the |
| 1097 | * write and hope for the best. |
| 1098 | */ |
| 1099 | printk(KERN_ERR "JBD2: previous I/O error detected " |
| 1100 | "for journal superblock update for %s.\n", |
| 1101 | journal->j_devname); |
| 1102 | clear_buffer_write_io_error(bh); |
| 1103 | set_buffer_uptodate(bh); |
| 1104 | } |
| 1105 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1106 | read_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1107 | jbd_debug(1,"JBD: updating superblock (start %ld, seq %d, errno %d)\n", |
| 1108 | journal->j_tail, journal->j_tail_sequence, journal->j_errno); |
| 1109 | |
| 1110 | sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); |
| 1111 | sb->s_start = cpu_to_be32(journal->j_tail); |
| 1112 | sb->s_errno = cpu_to_be32(journal->j_errno); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1113 | read_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1114 | |
| 1115 | BUFFER_TRACE(bh, "marking dirty"); |
| 1116 | mark_buffer_dirty(bh); |
Theodore Ts'o | 914258b | 2008-10-06 21:35:40 -0400 | [diff] [blame] | 1117 | if (wait) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1118 | sync_dirty_buffer(bh); |
Theodore Ts'o | 914258b | 2008-10-06 21:35:40 -0400 | [diff] [blame] | 1119 | if (buffer_write_io_error(bh)) { |
| 1120 | printk(KERN_ERR "JBD2: I/O error detected " |
| 1121 | "when updating journal superblock for %s.\n", |
| 1122 | journal->j_devname); |
| 1123 | clear_buffer_write_io_error(bh); |
| 1124 | set_buffer_uptodate(bh); |
| 1125 | } |
| 1126 | } else |
Christoph Hellwig | 9cb569d | 2010-08-11 17:06:24 +0200 | [diff] [blame] | 1127 | write_dirty_buffer(bh, WRITE); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1128 | |
| 1129 | out: |
| 1130 | /* If we have just flushed the log (by marking s_start==0), then |
| 1131 | * any future commit will have to be careful to update the |
| 1132 | * superblock again to re-record the true start of the log. */ |
| 1133 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1134 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1135 | if (sb->s_start) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1136 | journal->j_flags &= ~JBD2_FLUSHED; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1137 | else |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1138 | journal->j_flags |= JBD2_FLUSHED; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1139 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1140 | } |
| 1141 | |
| 1142 | /* |
| 1143 | * Read the superblock for a given journal, performing initial |
| 1144 | * validation of the format. |
| 1145 | */ |
| 1146 | |
| 1147 | static int journal_get_superblock(journal_t *journal) |
| 1148 | { |
| 1149 | struct buffer_head *bh; |
| 1150 | journal_superblock_t *sb; |
| 1151 | int err = -EIO; |
| 1152 | |
| 1153 | bh = journal->j_sb_buffer; |
| 1154 | |
| 1155 | J_ASSERT(bh != NULL); |
| 1156 | if (!buffer_uptodate(bh)) { |
| 1157 | ll_rw_block(READ, 1, &bh); |
| 1158 | wait_on_buffer(bh); |
| 1159 | if (!buffer_uptodate(bh)) { |
| 1160 | printk (KERN_ERR |
| 1161 | "JBD: IO error reading journal superblock\n"); |
| 1162 | goto out; |
| 1163 | } |
| 1164 | } |
| 1165 | |
| 1166 | sb = journal->j_superblock; |
| 1167 | |
| 1168 | err = -EINVAL; |
| 1169 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1170 | if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1171 | sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { |
| 1172 | printk(KERN_WARNING "JBD: no valid journal superblock found\n"); |
| 1173 | goto out; |
| 1174 | } |
| 1175 | |
| 1176 | switch(be32_to_cpu(sb->s_header.h_blocktype)) { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1177 | case JBD2_SUPERBLOCK_V1: |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1178 | journal->j_format_version = 1; |
| 1179 | break; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1180 | case JBD2_SUPERBLOCK_V2: |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1181 | journal->j_format_version = 2; |
| 1182 | break; |
| 1183 | default: |
| 1184 | printk(KERN_WARNING "JBD: unrecognised superblock format ID\n"); |
| 1185 | goto out; |
| 1186 | } |
| 1187 | |
| 1188 | if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) |
| 1189 | journal->j_maxlen = be32_to_cpu(sb->s_maxlen); |
| 1190 | else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { |
| 1191 | printk (KERN_WARNING "JBD: journal file too short\n"); |
| 1192 | goto out; |
| 1193 | } |
| 1194 | |
| 1195 | return 0; |
| 1196 | |
| 1197 | out: |
| 1198 | journal_fail_superblock(journal); |
| 1199 | return err; |
| 1200 | } |
| 1201 | |
| 1202 | /* |
| 1203 | * Load the on-disk journal superblock and read the key fields into the |
| 1204 | * journal_t. |
| 1205 | */ |
| 1206 | |
| 1207 | static int load_superblock(journal_t *journal) |
| 1208 | { |
| 1209 | int err; |
| 1210 | journal_superblock_t *sb; |
| 1211 | |
| 1212 | err = journal_get_superblock(journal); |
| 1213 | if (err) |
| 1214 | return err; |
| 1215 | |
| 1216 | sb = journal->j_superblock; |
| 1217 | |
| 1218 | journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); |
| 1219 | journal->j_tail = be32_to_cpu(sb->s_start); |
| 1220 | journal->j_first = be32_to_cpu(sb->s_first); |
| 1221 | journal->j_last = be32_to_cpu(sb->s_maxlen); |
| 1222 | journal->j_errno = be32_to_cpu(sb->s_errno); |
| 1223 | |
| 1224 | return 0; |
| 1225 | } |
| 1226 | |
| 1227 | |
| 1228 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1229 | * int jbd2_journal_load() - Read journal from disk. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1230 | * @journal: Journal to act on. |
| 1231 | * |
| 1232 | * Given a journal_t structure which tells us which disk blocks contain |
| 1233 | * a journal, read the journal from disk to initialise the in-memory |
| 1234 | * structures. |
| 1235 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1236 | int jbd2_journal_load(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1237 | { |
| 1238 | int err; |
| 1239 | journal_superblock_t *sb; |
| 1240 | |
| 1241 | err = load_superblock(journal); |
| 1242 | if (err) |
| 1243 | return err; |
| 1244 | |
| 1245 | sb = journal->j_superblock; |
| 1246 | /* If this is a V2 superblock, then we have to check the |
| 1247 | * features flags on it. */ |
| 1248 | |
| 1249 | if (journal->j_format_version >= 2) { |
| 1250 | if ((sb->s_feature_ro_compat & |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1251 | ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1252 | (sb->s_feature_incompat & |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1253 | ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1254 | printk (KERN_WARNING |
| 1255 | "JBD: Unrecognised features on journal\n"); |
| 1256 | return -EINVAL; |
| 1257 | } |
| 1258 | } |
| 1259 | |
Theodore Ts'o | d2eecb0 | 2009-12-07 10:36:20 -0500 | [diff] [blame] | 1260 | /* |
| 1261 | * Create a slab for this blocksize |
| 1262 | */ |
| 1263 | err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); |
| 1264 | if (err) |
| 1265 | return err; |
| 1266 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1267 | /* Let the recovery code check whether it needs to recover any |
| 1268 | * data from the journal. */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1269 | if (jbd2_journal_recover(journal)) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1270 | goto recovery_error; |
| 1271 | |
Theodore Ts'o | e6a4742 | 2009-11-15 15:31:37 -0500 | [diff] [blame] | 1272 | if (journal->j_failed_commit) { |
| 1273 | printk(KERN_ERR "JBD2: journal transaction %u on %s " |
| 1274 | "is corrupt.\n", journal->j_failed_commit, |
| 1275 | journal->j_devname); |
| 1276 | return -EIO; |
| 1277 | } |
| 1278 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1279 | /* OK, we've finished with the dynamic journal bits: |
| 1280 | * reinitialise the dynamic contents of the superblock in memory |
| 1281 | * and reset them on disk. */ |
| 1282 | if (journal_reset(journal)) |
| 1283 | goto recovery_error; |
| 1284 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1285 | journal->j_flags &= ~JBD2_ABORT; |
| 1286 | journal->j_flags |= JBD2_LOADED; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1287 | return 0; |
| 1288 | |
| 1289 | recovery_error: |
| 1290 | printk (KERN_WARNING "JBD: recovery failed\n"); |
| 1291 | return -EIO; |
| 1292 | } |
| 1293 | |
| 1294 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1295 | * void jbd2_journal_destroy() - Release a journal_t structure. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1296 | * @journal: Journal to act on. |
| 1297 | * |
| 1298 | * Release a journal_t structure once it is no longer in use by the |
| 1299 | * journaled object. |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1300 | * Return <0 if we couldn't clean up the journal. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1301 | */ |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1302 | int jbd2_journal_destroy(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1303 | { |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1304 | int err = 0; |
| 1305 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1306 | /* Wait for the commit thread to wake up and die. */ |
| 1307 | journal_kill_thread(journal); |
| 1308 | |
| 1309 | /* Force a final log commit */ |
| 1310 | if (journal->j_running_transaction) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1311 | jbd2_journal_commit_transaction(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1312 | |
| 1313 | /* Force any old transactions to disk */ |
| 1314 | |
| 1315 | /* Totally anal locking here... */ |
| 1316 | spin_lock(&journal->j_list_lock); |
| 1317 | while (journal->j_checkpoint_transactions != NULL) { |
| 1318 | spin_unlock(&journal->j_list_lock); |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 1319 | mutex_lock(&journal->j_checkpoint_mutex); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1320 | jbd2_log_do_checkpoint(journal); |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 1321 | mutex_unlock(&journal->j_checkpoint_mutex); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1322 | spin_lock(&journal->j_list_lock); |
| 1323 | } |
| 1324 | |
| 1325 | J_ASSERT(journal->j_running_transaction == NULL); |
| 1326 | J_ASSERT(journal->j_committing_transaction == NULL); |
| 1327 | J_ASSERT(journal->j_checkpoint_transactions == NULL); |
| 1328 | spin_unlock(&journal->j_list_lock); |
| 1329 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1330 | if (journal->j_sb_buffer) { |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1331 | if (!is_journal_aborted(journal)) { |
| 1332 | /* We can now mark the journal as empty. */ |
| 1333 | journal->j_tail = 0; |
| 1334 | journal->j_tail_sequence = |
| 1335 | ++journal->j_transaction_sequence; |
| 1336 | jbd2_journal_update_superblock(journal, 1); |
| 1337 | } else { |
| 1338 | err = -EIO; |
| 1339 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1340 | brelse(journal->j_sb_buffer); |
| 1341 | } |
| 1342 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1343 | if (journal->j_proc_entry) |
| 1344 | jbd2_stats_proc_exit(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1345 | if (journal->j_inode) |
| 1346 | iput(journal->j_inode); |
| 1347 | if (journal->j_revoke) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1348 | jbd2_journal_destroy_revoke(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1349 | kfree(journal->j_wbuf); |
| 1350 | kfree(journal); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1351 | |
| 1352 | return err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | |
| 1356 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1357 | *int jbd2_journal_check_used_features () - Check if features specified are used. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1358 | * @journal: Journal to check. |
| 1359 | * @compat: bitmask of compatible features |
| 1360 | * @ro: bitmask of features that force read-only mount |
| 1361 | * @incompat: bitmask of incompatible features |
| 1362 | * |
| 1363 | * Check whether the journal uses all of a given set of |
| 1364 | * features. Return true (non-zero) if it does. |
| 1365 | **/ |
| 1366 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1367 | int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1368 | unsigned long ro, unsigned long incompat) |
| 1369 | { |
| 1370 | journal_superblock_t *sb; |
| 1371 | |
| 1372 | if (!compat && !ro && !incompat) |
| 1373 | return 1; |
| 1374 | if (journal->j_format_version == 1) |
| 1375 | return 0; |
| 1376 | |
| 1377 | sb = journal->j_superblock; |
| 1378 | |
| 1379 | if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && |
| 1380 | ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && |
| 1381 | ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) |
| 1382 | return 1; |
| 1383 | |
| 1384 | return 0; |
| 1385 | } |
| 1386 | |
| 1387 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1388 | * int jbd2_journal_check_available_features() - Check feature set in journalling layer |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1389 | * @journal: Journal to check. |
| 1390 | * @compat: bitmask of compatible features |
| 1391 | * @ro: bitmask of features that force read-only mount |
| 1392 | * @incompat: bitmask of incompatible features |
| 1393 | * |
| 1394 | * Check whether the journaling code supports the use of |
| 1395 | * all of a given set of features on this journal. Return true |
| 1396 | * (non-zero) if it can. */ |
| 1397 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1398 | int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1399 | unsigned long ro, unsigned long incompat) |
| 1400 | { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1401 | if (!compat && !ro && !incompat) |
| 1402 | return 1; |
| 1403 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1404 | /* We can support any known requested features iff the |
| 1405 | * superblock is in version 2. Otherwise we fail to support any |
| 1406 | * extended sb features. */ |
| 1407 | |
| 1408 | if (journal->j_format_version != 2) |
| 1409 | return 0; |
| 1410 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1411 | if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && |
| 1412 | (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && |
| 1413 | (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1414 | return 1; |
| 1415 | |
| 1416 | return 0; |
| 1417 | } |
| 1418 | |
| 1419 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1420 | * int jbd2_journal_set_features () - Mark a given journal feature in the superblock |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1421 | * @journal: Journal to act on. |
| 1422 | * @compat: bitmask of compatible features |
| 1423 | * @ro: bitmask of features that force read-only mount |
| 1424 | * @incompat: bitmask of incompatible features |
| 1425 | * |
| 1426 | * Mark a given journal feature as present on the |
| 1427 | * superblock. Returns true if the requested features could be set. |
| 1428 | * |
| 1429 | */ |
| 1430 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1431 | int jbd2_journal_set_features (journal_t *journal, unsigned long compat, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1432 | unsigned long ro, unsigned long incompat) |
| 1433 | { |
| 1434 | journal_superblock_t *sb; |
| 1435 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1436 | if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1437 | return 1; |
| 1438 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1439 | if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1440 | return 0; |
| 1441 | |
| 1442 | jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", |
| 1443 | compat, ro, incompat); |
| 1444 | |
| 1445 | sb = journal->j_superblock; |
| 1446 | |
| 1447 | sb->s_feature_compat |= cpu_to_be32(compat); |
| 1448 | sb->s_feature_ro_compat |= cpu_to_be32(ro); |
| 1449 | sb->s_feature_incompat |= cpu_to_be32(incompat); |
| 1450 | |
| 1451 | return 1; |
| 1452 | } |
| 1453 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1454 | /* |
| 1455 | * jbd2_journal_clear_features () - Clear a given journal feature in the |
| 1456 | * superblock |
| 1457 | * @journal: Journal to act on. |
| 1458 | * @compat: bitmask of compatible features |
| 1459 | * @ro: bitmask of features that force read-only mount |
| 1460 | * @incompat: bitmask of incompatible features |
| 1461 | * |
| 1462 | * Clear a given journal feature as present on the |
| 1463 | * superblock. |
| 1464 | */ |
| 1465 | void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, |
| 1466 | unsigned long ro, unsigned long incompat) |
| 1467 | { |
| 1468 | journal_superblock_t *sb; |
| 1469 | |
| 1470 | jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", |
| 1471 | compat, ro, incompat); |
| 1472 | |
| 1473 | sb = journal->j_superblock; |
| 1474 | |
| 1475 | sb->s_feature_compat &= ~cpu_to_be32(compat); |
| 1476 | sb->s_feature_ro_compat &= ~cpu_to_be32(ro); |
| 1477 | sb->s_feature_incompat &= ~cpu_to_be32(incompat); |
| 1478 | } |
| 1479 | EXPORT_SYMBOL(jbd2_journal_clear_features); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1480 | |
| 1481 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1482 | * int jbd2_journal_update_format () - Update on-disk journal structure. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1483 | * @journal: Journal to act on. |
| 1484 | * |
| 1485 | * Given an initialised but unloaded journal struct, poke about in the |
| 1486 | * on-disk structure to update it to the most recent supported version. |
| 1487 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1488 | int jbd2_journal_update_format (journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1489 | { |
| 1490 | journal_superblock_t *sb; |
| 1491 | int err; |
| 1492 | |
| 1493 | err = journal_get_superblock(journal); |
| 1494 | if (err) |
| 1495 | return err; |
| 1496 | |
| 1497 | sb = journal->j_superblock; |
| 1498 | |
| 1499 | switch (be32_to_cpu(sb->s_header.h_blocktype)) { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1500 | case JBD2_SUPERBLOCK_V2: |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1501 | return 0; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1502 | case JBD2_SUPERBLOCK_V1: |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1503 | return journal_convert_superblock_v1(journal, sb); |
| 1504 | default: |
| 1505 | break; |
| 1506 | } |
| 1507 | return -EINVAL; |
| 1508 | } |
| 1509 | |
| 1510 | static int journal_convert_superblock_v1(journal_t *journal, |
| 1511 | journal_superblock_t *sb) |
| 1512 | { |
| 1513 | int offset, blocksize; |
| 1514 | struct buffer_head *bh; |
| 1515 | |
| 1516 | printk(KERN_WARNING |
| 1517 | "JBD: Converting superblock from version 1 to 2.\n"); |
| 1518 | |
| 1519 | /* Pre-initialise new fields to zero */ |
| 1520 | offset = ((char *) &(sb->s_feature_compat)) - ((char *) sb); |
| 1521 | blocksize = be32_to_cpu(sb->s_blocksize); |
| 1522 | memset(&sb->s_feature_compat, 0, blocksize-offset); |
| 1523 | |
| 1524 | sb->s_nr_users = cpu_to_be32(1); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1525 | sb->s_header.h_blocktype = cpu_to_be32(JBD2_SUPERBLOCK_V2); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1526 | journal->j_format_version = 2; |
| 1527 | |
| 1528 | bh = journal->j_sb_buffer; |
| 1529 | BUFFER_TRACE(bh, "marking dirty"); |
| 1530 | mark_buffer_dirty(bh); |
| 1531 | sync_dirty_buffer(bh); |
| 1532 | return 0; |
| 1533 | } |
| 1534 | |
| 1535 | |
| 1536 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1537 | * int jbd2_journal_flush () - Flush journal |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1538 | * @journal: Journal to act on. |
| 1539 | * |
| 1540 | * Flush all data for a given journal to disk and empty the journal. |
| 1541 | * Filesystems can use this when remounting readonly to ensure that |
| 1542 | * recovery does not need to happen on remount. |
| 1543 | */ |
| 1544 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1545 | int jbd2_journal_flush(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1546 | { |
| 1547 | int err = 0; |
| 1548 | transaction_t *transaction = NULL; |
| 1549 | unsigned long old_tail; |
| 1550 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1551 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1552 | |
| 1553 | /* Force everything buffered to the log... */ |
| 1554 | if (journal->j_running_transaction) { |
| 1555 | transaction = journal->j_running_transaction; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1556 | __jbd2_log_start_commit(journal, transaction->t_tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1557 | } else if (journal->j_committing_transaction) |
| 1558 | transaction = journal->j_committing_transaction; |
| 1559 | |
| 1560 | /* Wait for the log commit to complete... */ |
| 1561 | if (transaction) { |
| 1562 | tid_t tid = transaction->t_tid; |
| 1563 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1564 | write_unlock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1565 | jbd2_log_wait_commit(journal, tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1566 | } else { |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1567 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1568 | } |
| 1569 | |
| 1570 | /* ...and flush everything in the log out to disk. */ |
| 1571 | spin_lock(&journal->j_list_lock); |
| 1572 | while (!err && journal->j_checkpoint_transactions != NULL) { |
| 1573 | spin_unlock(&journal->j_list_lock); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1574 | mutex_lock(&journal->j_checkpoint_mutex); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1575 | err = jbd2_log_do_checkpoint(journal); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1576 | mutex_unlock(&journal->j_checkpoint_mutex); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1577 | spin_lock(&journal->j_list_lock); |
| 1578 | } |
| 1579 | spin_unlock(&journal->j_list_lock); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1580 | |
| 1581 | if (is_journal_aborted(journal)) |
| 1582 | return -EIO; |
| 1583 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1584 | jbd2_cleanup_journal_tail(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1585 | |
| 1586 | /* Finally, mark the journal as really needing no recovery. |
| 1587 | * This sets s_start==0 in the underlying superblock, which is |
| 1588 | * the magic code for a fully-recovered superblock. Any future |
| 1589 | * commits of data to the journal will restore the current |
| 1590 | * s_start value. */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1591 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1592 | old_tail = journal->j_tail; |
| 1593 | journal->j_tail = 0; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1594 | write_unlock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1595 | jbd2_journal_update_superblock(journal, 1); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1596 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1597 | journal->j_tail = old_tail; |
| 1598 | |
| 1599 | J_ASSERT(!journal->j_running_transaction); |
| 1600 | J_ASSERT(!journal->j_committing_transaction); |
| 1601 | J_ASSERT(!journal->j_checkpoint_transactions); |
| 1602 | J_ASSERT(journal->j_head == journal->j_tail); |
| 1603 | J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1604 | write_unlock(&journal->j_state_lock); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 1605 | return 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1606 | } |
| 1607 | |
| 1608 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1609 | * int jbd2_journal_wipe() - Wipe journal contents |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1610 | * @journal: Journal to act on. |
| 1611 | * @write: flag (see below) |
| 1612 | * |
| 1613 | * Wipe out all of the contents of a journal, safely. This will produce |
| 1614 | * a warning if the journal contains any valid recovery information. |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1615 | * Must be called between journal_init_*() and jbd2_journal_load(). |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1616 | * |
| 1617 | * If 'write' is non-zero, then we wipe out the journal on disk; otherwise |
| 1618 | * we merely suppress recovery. |
| 1619 | */ |
| 1620 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1621 | int jbd2_journal_wipe(journal_t *journal, int write) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1622 | { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1623 | int err = 0; |
| 1624 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1625 | J_ASSERT (!(journal->j_flags & JBD2_LOADED)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1626 | |
| 1627 | err = load_superblock(journal); |
| 1628 | if (err) |
| 1629 | return err; |
| 1630 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1631 | if (!journal->j_tail) |
| 1632 | goto no_recovery; |
| 1633 | |
| 1634 | printk (KERN_WARNING "JBD: %s recovery information on journal\n", |
| 1635 | write ? "Clearing" : "Ignoring"); |
| 1636 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1637 | err = jbd2_journal_skip_recovery(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1638 | if (write) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1639 | jbd2_journal_update_superblock(journal, 1); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1640 | |
| 1641 | no_recovery: |
| 1642 | return err; |
| 1643 | } |
| 1644 | |
| 1645 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1646 | * Journal abort has very specific semantics, which we describe |
| 1647 | * for journal abort. |
| 1648 | * |
Alberto Bertogli | bfcd355 | 2009-06-09 00:06:20 -0400 | [diff] [blame] | 1649 | * Two internal functions, which provide abort to the jbd layer |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1650 | * itself are here. |
| 1651 | */ |
| 1652 | |
| 1653 | /* |
| 1654 | * Quick version for internal journal use (doesn't lock the journal). |
| 1655 | * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, |
| 1656 | * and don't attempt to make any other journal updates. |
| 1657 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1658 | void __jbd2_journal_abort_hard(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1659 | { |
| 1660 | transaction_t *transaction; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1661 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1662 | if (journal->j_flags & JBD2_ABORT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1663 | return; |
| 1664 | |
| 1665 | printk(KERN_ERR "Aborting journal on device %s.\n", |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 1666 | journal->j_devname); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1667 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1668 | write_lock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1669 | journal->j_flags |= JBD2_ABORT; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1670 | transaction = journal->j_running_transaction; |
| 1671 | if (transaction) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1672 | __jbd2_log_start_commit(journal, transaction->t_tid); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1673 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1674 | } |
| 1675 | |
| 1676 | /* Soft abort: record the abort error status in the journal superblock, |
| 1677 | * but don't do any other IO. */ |
| 1678 | static void __journal_abort_soft (journal_t *journal, int errno) |
| 1679 | { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1680 | if (journal->j_flags & JBD2_ABORT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1681 | return; |
| 1682 | |
| 1683 | if (!journal->j_errno) |
| 1684 | journal->j_errno = errno; |
| 1685 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1686 | __jbd2_journal_abort_hard(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1687 | |
| 1688 | if (errno) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1689 | jbd2_journal_update_superblock(journal, 1); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1690 | } |
| 1691 | |
| 1692 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1693 | * void jbd2_journal_abort () - Shutdown the journal immediately. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1694 | * @journal: the journal to shutdown. |
| 1695 | * @errno: an error number to record in the journal indicating |
| 1696 | * the reason for the shutdown. |
| 1697 | * |
| 1698 | * Perform a complete, immediate shutdown of the ENTIRE |
| 1699 | * journal (not of a single transaction). This operation cannot be |
| 1700 | * undone without closing and reopening the journal. |
| 1701 | * |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1702 | * The jbd2_journal_abort function is intended to support higher level error |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1703 | * recovery mechanisms such as the ext2/ext3 remount-readonly error |
| 1704 | * mode. |
| 1705 | * |
| 1706 | * Journal abort has very specific semantics. Any existing dirty, |
| 1707 | * unjournaled buffers in the main filesystem will still be written to |
| 1708 | * disk by bdflush, but the journaling mechanism will be suspended |
| 1709 | * immediately and no further transaction commits will be honoured. |
| 1710 | * |
| 1711 | * Any dirty, journaled buffers will be written back to disk without |
| 1712 | * hitting the journal. Atomicity cannot be guaranteed on an aborted |
| 1713 | * filesystem, but we _do_ attempt to leave as much data as possible |
| 1714 | * behind for fsck to use for cleanup. |
| 1715 | * |
| 1716 | * Any attempt to get a new transaction handle on a journal which is in |
| 1717 | * ABORT state will just result in an -EROFS error return. A |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1718 | * jbd2_journal_stop on an existing handle will return -EIO if we have |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1719 | * entered abort state during the update. |
| 1720 | * |
| 1721 | * Recursive transactions are not disturbed by journal abort until the |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1722 | * final jbd2_journal_stop, which will receive the -EIO error. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1723 | * |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1724 | * Finally, the jbd2_journal_abort call allows the caller to supply an errno |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1725 | * which will be recorded (if possible) in the journal superblock. This |
| 1726 | * allows a client to record failure conditions in the middle of a |
| 1727 | * transaction without having to complete the transaction to record the |
| 1728 | * failure to disk. ext3_error, for example, now uses this |
| 1729 | * functionality. |
| 1730 | * |
| 1731 | * Errors which originate from within the journaling layer will NOT |
| 1732 | * supply an errno; a null errno implies that absolutely no further |
| 1733 | * writes are done to the journal (unless there are any already in |
| 1734 | * progress). |
| 1735 | * |
| 1736 | */ |
| 1737 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1738 | void jbd2_journal_abort(journal_t *journal, int errno) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1739 | { |
| 1740 | __journal_abort_soft(journal, errno); |
| 1741 | } |
| 1742 | |
| 1743 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1744 | * int jbd2_journal_errno () - returns the journal's error state. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1745 | * @journal: journal to examine. |
| 1746 | * |
Alberto Bertogli | bfcd355 | 2009-06-09 00:06:20 -0400 | [diff] [blame] | 1747 | * This is the errno number set with jbd2_journal_abort(), the last |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1748 | * time the journal was mounted - if the journal was stopped |
| 1749 | * without calling abort this will be 0. |
| 1750 | * |
| 1751 | * If the journal has been aborted on this mount time -EROFS will |
| 1752 | * be returned. |
| 1753 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1754 | int jbd2_journal_errno(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1755 | { |
| 1756 | int err; |
| 1757 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1758 | read_lock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1759 | if (journal->j_flags & JBD2_ABORT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1760 | err = -EROFS; |
| 1761 | else |
| 1762 | err = journal->j_errno; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1763 | read_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1764 | return err; |
| 1765 | } |
| 1766 | |
| 1767 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1768 | * int jbd2_journal_clear_err () - clears the journal's error state |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1769 | * @journal: journal to act on. |
| 1770 | * |
Alberto Bertogli | bfcd355 | 2009-06-09 00:06:20 -0400 | [diff] [blame] | 1771 | * An error must be cleared or acked to take a FS out of readonly |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1772 | * mode. |
| 1773 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1774 | int jbd2_journal_clear_err(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1775 | { |
| 1776 | int err = 0; |
| 1777 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1778 | write_lock(&journal->j_state_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1779 | if (journal->j_flags & JBD2_ABORT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1780 | err = -EROFS; |
| 1781 | else |
| 1782 | journal->j_errno = 0; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1783 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1784 | return err; |
| 1785 | } |
| 1786 | |
| 1787 | /** |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1788 | * void jbd2_journal_ack_err() - Ack journal err. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1789 | * @journal: journal to act on. |
| 1790 | * |
Alberto Bertogli | bfcd355 | 2009-06-09 00:06:20 -0400 | [diff] [blame] | 1791 | * An error must be cleared or acked to take a FS out of readonly |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1792 | * mode. |
| 1793 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1794 | void jbd2_journal_ack_err(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1795 | { |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1796 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1797 | if (journal->j_errno) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1798 | journal->j_flags |= JBD2_ACK_ERR; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1799 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1800 | } |
| 1801 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1802 | int jbd2_journal_blocks_per_page(struct inode *inode) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1803 | { |
| 1804 | return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); |
| 1805 | } |
| 1806 | |
| 1807 | /* |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 1808 | * helper functions to deal with 32 or 64bit block numbers. |
| 1809 | */ |
| 1810 | size_t journal_tag_bytes(journal_t *journal) |
| 1811 | { |
| 1812 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1813 | return JBD2_TAG_SIZE64; |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 1814 | else |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 1815 | return JBD2_TAG_SIZE32; |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 1816 | } |
| 1817 | |
| 1818 | /* |
Theodore Ts'o | d2eecb0 | 2009-12-07 10:36:20 -0500 | [diff] [blame] | 1819 | * JBD memory management |
| 1820 | * |
| 1821 | * These functions are used to allocate block-sized chunks of memory |
| 1822 | * used for making copies of buffer_head data. Very often it will be |
| 1823 | * page-sized chunks of data, but sometimes it will be in |
| 1824 | * sub-page-size chunks. (For example, 16k pages on Power systems |
| 1825 | * with a 4k block file system.) For blocks smaller than a page, we |
| 1826 | * use a SLAB allocator. There are slab caches for each block size, |
| 1827 | * which are allocated at mount time, if necessary, and we only free |
| 1828 | * (all of) the slab caches when/if the jbd2 module is unloaded. For |
| 1829 | * this reason we don't need to a mutex to protect access to |
| 1830 | * jbd2_slab[] allocating or releasing memory; only in |
| 1831 | * jbd2_journal_create_slab(). |
| 1832 | */ |
| 1833 | #define JBD2_MAX_SLABS 8 |
| 1834 | static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; |
| 1835 | static DECLARE_MUTEX(jbd2_slab_create_sem); |
| 1836 | |
| 1837 | static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { |
| 1838 | "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", |
| 1839 | "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" |
| 1840 | }; |
| 1841 | |
| 1842 | |
| 1843 | static void jbd2_journal_destroy_slabs(void) |
| 1844 | { |
| 1845 | int i; |
| 1846 | |
| 1847 | for (i = 0; i < JBD2_MAX_SLABS; i++) { |
| 1848 | if (jbd2_slab[i]) |
| 1849 | kmem_cache_destroy(jbd2_slab[i]); |
| 1850 | jbd2_slab[i] = NULL; |
| 1851 | } |
| 1852 | } |
| 1853 | |
| 1854 | static int jbd2_journal_create_slab(size_t size) |
| 1855 | { |
| 1856 | int i = order_base_2(size) - 10; |
| 1857 | size_t slab_size; |
| 1858 | |
| 1859 | if (size == PAGE_SIZE) |
| 1860 | return 0; |
| 1861 | |
| 1862 | if (i >= JBD2_MAX_SLABS) |
| 1863 | return -EINVAL; |
| 1864 | |
| 1865 | if (unlikely(i < 0)) |
| 1866 | i = 0; |
| 1867 | down(&jbd2_slab_create_sem); |
| 1868 | if (jbd2_slab[i]) { |
| 1869 | up(&jbd2_slab_create_sem); |
| 1870 | return 0; /* Already created */ |
| 1871 | } |
| 1872 | |
| 1873 | slab_size = 1 << (i+10); |
| 1874 | jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, |
| 1875 | slab_size, 0, NULL); |
| 1876 | up(&jbd2_slab_create_sem); |
| 1877 | if (!jbd2_slab[i]) { |
| 1878 | printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); |
| 1879 | return -ENOMEM; |
| 1880 | } |
| 1881 | return 0; |
| 1882 | } |
| 1883 | |
| 1884 | static struct kmem_cache *get_slab(size_t size) |
| 1885 | { |
| 1886 | int i = order_base_2(size) - 10; |
| 1887 | |
| 1888 | BUG_ON(i >= JBD2_MAX_SLABS); |
| 1889 | if (unlikely(i < 0)) |
| 1890 | i = 0; |
Bill Pemberton | 8ac97b7 | 2010-04-30 09:34:31 -0400 | [diff] [blame] | 1891 | BUG_ON(jbd2_slab[i] == NULL); |
Theodore Ts'o | d2eecb0 | 2009-12-07 10:36:20 -0500 | [diff] [blame] | 1892 | return jbd2_slab[i]; |
| 1893 | } |
| 1894 | |
| 1895 | void *jbd2_alloc(size_t size, gfp_t flags) |
| 1896 | { |
| 1897 | void *ptr; |
| 1898 | |
| 1899 | BUG_ON(size & (size-1)); /* Must be a power of 2 */ |
| 1900 | |
| 1901 | flags |= __GFP_REPEAT; |
| 1902 | if (size == PAGE_SIZE) |
| 1903 | ptr = (void *)__get_free_pages(flags, 0); |
| 1904 | else if (size > PAGE_SIZE) { |
| 1905 | int order = get_order(size); |
| 1906 | |
| 1907 | if (order < 3) |
| 1908 | ptr = (void *)__get_free_pages(flags, order); |
| 1909 | else |
| 1910 | ptr = vmalloc(size); |
| 1911 | } else |
| 1912 | ptr = kmem_cache_alloc(get_slab(size), flags); |
| 1913 | |
| 1914 | /* Check alignment; SLUB has gotten this wrong in the past, |
| 1915 | * and this can lead to user data corruption! */ |
| 1916 | BUG_ON(((unsigned long) ptr) & (size-1)); |
| 1917 | |
| 1918 | return ptr; |
| 1919 | } |
| 1920 | |
| 1921 | void jbd2_free(void *ptr, size_t size) |
| 1922 | { |
| 1923 | if (size == PAGE_SIZE) { |
| 1924 | free_pages((unsigned long)ptr, 0); |
| 1925 | return; |
| 1926 | } |
| 1927 | if (size > PAGE_SIZE) { |
| 1928 | int order = get_order(size); |
| 1929 | |
| 1930 | if (order < 3) |
| 1931 | free_pages((unsigned long)ptr, order); |
| 1932 | else |
| 1933 | vfree(ptr); |
| 1934 | return; |
| 1935 | } |
| 1936 | kmem_cache_free(get_slab(size), ptr); |
| 1937 | }; |
| 1938 | |
| 1939 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1940 | * Journal_head storage management |
| 1941 | */ |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 1942 | static struct kmem_cache *jbd2_journal_head_cache; |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 1943 | #ifdef CONFIG_JBD2_DEBUG |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1944 | static atomic_t nr_journal_heads = ATOMIC_INIT(0); |
| 1945 | #endif |
| 1946 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1947 | static int journal_init_jbd2_journal_head_cache(void) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1948 | { |
| 1949 | int retval; |
| 1950 | |
Al Viro | 1076d17 | 2008-03-29 03:07:18 +0000 | [diff] [blame] | 1951 | J_ASSERT(jbd2_journal_head_cache == NULL); |
Johann Lombardi | a920e94 | 2006-10-11 01:21:00 -0700 | [diff] [blame] | 1952 | jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1953 | sizeof(struct journal_head), |
| 1954 | 0, /* offset */ |
Mingming Cao | 7716095 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1955 | SLAB_TEMPORARY, /* flags */ |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1956 | NULL); /* ctor */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1957 | retval = 0; |
Al Viro | 1076d17 | 2008-03-29 03:07:18 +0000 | [diff] [blame] | 1958 | if (!jbd2_journal_head_cache) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1959 | retval = -ENOMEM; |
| 1960 | printk(KERN_EMERG "JBD: no memory for journal_head cache\n"); |
| 1961 | } |
| 1962 | return retval; |
| 1963 | } |
| 1964 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1965 | static void jbd2_journal_destroy_jbd2_journal_head_cache(void) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1966 | { |
Duane Griffin | 8a9362e | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1967 | if (jbd2_journal_head_cache) { |
| 1968 | kmem_cache_destroy(jbd2_journal_head_cache); |
| 1969 | jbd2_journal_head_cache = NULL; |
| 1970 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1971 | } |
| 1972 | |
| 1973 | /* |
| 1974 | * journal_head splicing and dicing |
| 1975 | */ |
| 1976 | static struct journal_head *journal_alloc_journal_head(void) |
| 1977 | { |
| 1978 | struct journal_head *ret; |
| 1979 | static unsigned long last_warning; |
| 1980 | |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 1981 | #ifdef CONFIG_JBD2_DEBUG |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1982 | atomic_inc(&nr_journal_heads); |
| 1983 | #endif |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1984 | ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); |
Al Viro | 1076d17 | 2008-03-29 03:07:18 +0000 | [diff] [blame] | 1985 | if (!ret) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1986 | jbd_debug(1, "out of memory for journal_head\n"); |
| 1987 | if (time_after(jiffies, last_warning + 5*HZ)) { |
| 1988 | printk(KERN_NOTICE "ENOMEM in %s, retrying.\n", |
Harvey Harrison | 329d291 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 1989 | __func__); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1990 | last_warning = jiffies; |
| 1991 | } |
Al Viro | 1076d17 | 2008-03-29 03:07:18 +0000 | [diff] [blame] | 1992 | while (!ret) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1993 | yield(); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1994 | ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1995 | } |
| 1996 | } |
| 1997 | return ret; |
| 1998 | } |
| 1999 | |
| 2000 | static void journal_free_journal_head(struct journal_head *jh) |
| 2001 | { |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 2002 | #ifdef CONFIG_JBD2_DEBUG |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2003 | atomic_dec(&nr_journal_heads); |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2004 | memset(jh, JBD2_POISON_FREE, sizeof(*jh)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2005 | #endif |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2006 | kmem_cache_free(jbd2_journal_head_cache, jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2007 | } |
| 2008 | |
| 2009 | /* |
| 2010 | * A journal_head is attached to a buffer_head whenever JBD has an |
| 2011 | * interest in the buffer. |
| 2012 | * |
| 2013 | * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit |
| 2014 | * is set. This bit is tested in core kernel code where we need to take |
| 2015 | * JBD-specific actions. Testing the zeroness of ->b_private is not reliable |
| 2016 | * there. |
| 2017 | * |
| 2018 | * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. |
| 2019 | * |
| 2020 | * When a buffer has its BH_JBD bit set it is immune from being released by |
| 2021 | * core kernel code, mainly via ->b_count. |
| 2022 | * |
| 2023 | * A journal_head may be detached from its buffer_head when the journal_head's |
| 2024 | * b_transaction, b_cp_transaction and b_next_transaction pointers are NULL. |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2025 | * Various places in JBD call jbd2_journal_remove_journal_head() to indicate that the |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2026 | * journal_head can be dropped if needed. |
| 2027 | * |
| 2028 | * Various places in the kernel want to attach a journal_head to a buffer_head |
| 2029 | * _before_ attaching the journal_head to a transaction. To protect the |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2030 | * journal_head in this situation, jbd2_journal_add_journal_head elevates the |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2031 | * journal_head's b_jcount refcount by one. The caller must call |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2032 | * jbd2_journal_put_journal_head() to undo this. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2033 | * |
| 2034 | * So the typical usage would be: |
| 2035 | * |
| 2036 | * (Attach a journal_head if needed. Increments b_jcount) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2037 | * struct journal_head *jh = jbd2_journal_add_journal_head(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2038 | * ... |
| 2039 | * jh->b_transaction = xxx; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2040 | * jbd2_journal_put_journal_head(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2041 | * |
| 2042 | * Now, the journal_head's b_jcount is zero, but it is safe from being released |
| 2043 | * because it has a non-zero b_transaction. |
| 2044 | */ |
| 2045 | |
| 2046 | /* |
| 2047 | * Give a buffer_head a journal_head. |
| 2048 | * |
| 2049 | * Doesn't need the journal lock. |
| 2050 | * May sleep. |
| 2051 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2052 | struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2053 | { |
| 2054 | struct journal_head *jh; |
| 2055 | struct journal_head *new_jh = NULL; |
| 2056 | |
| 2057 | repeat: |
| 2058 | if (!buffer_jbd(bh)) { |
| 2059 | new_jh = journal_alloc_journal_head(); |
| 2060 | memset(new_jh, 0, sizeof(*new_jh)); |
| 2061 | } |
| 2062 | |
| 2063 | jbd_lock_bh_journal_head(bh); |
| 2064 | if (buffer_jbd(bh)) { |
| 2065 | jh = bh2jh(bh); |
| 2066 | } else { |
| 2067 | J_ASSERT_BH(bh, |
| 2068 | (atomic_read(&bh->b_count) > 0) || |
| 2069 | (bh->b_page && bh->b_page->mapping)); |
| 2070 | |
| 2071 | if (!new_jh) { |
| 2072 | jbd_unlock_bh_journal_head(bh); |
| 2073 | goto repeat; |
| 2074 | } |
| 2075 | |
| 2076 | jh = new_jh; |
| 2077 | new_jh = NULL; /* We consumed it */ |
| 2078 | set_buffer_jbd(bh); |
| 2079 | bh->b_private = jh; |
| 2080 | jh->b_bh = bh; |
| 2081 | get_bh(bh); |
| 2082 | BUFFER_TRACE(bh, "added journal_head"); |
| 2083 | } |
| 2084 | jh->b_jcount++; |
| 2085 | jbd_unlock_bh_journal_head(bh); |
| 2086 | if (new_jh) |
| 2087 | journal_free_journal_head(new_jh); |
| 2088 | return bh->b_private; |
| 2089 | } |
| 2090 | |
| 2091 | /* |
| 2092 | * Grab a ref against this buffer_head's journal_head. If it ended up not |
| 2093 | * having a journal_head, return NULL |
| 2094 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2095 | struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2096 | { |
| 2097 | struct journal_head *jh = NULL; |
| 2098 | |
| 2099 | jbd_lock_bh_journal_head(bh); |
| 2100 | if (buffer_jbd(bh)) { |
| 2101 | jh = bh2jh(bh); |
| 2102 | jh->b_jcount++; |
| 2103 | } |
| 2104 | jbd_unlock_bh_journal_head(bh); |
| 2105 | return jh; |
| 2106 | } |
| 2107 | |
| 2108 | static void __journal_remove_journal_head(struct buffer_head *bh) |
| 2109 | { |
| 2110 | struct journal_head *jh = bh2jh(bh); |
| 2111 | |
| 2112 | J_ASSERT_JH(jh, jh->b_jcount >= 0); |
| 2113 | |
| 2114 | get_bh(bh); |
| 2115 | if (jh->b_jcount == 0) { |
| 2116 | if (jh->b_transaction == NULL && |
| 2117 | jh->b_next_transaction == NULL && |
| 2118 | jh->b_cp_transaction == NULL) { |
| 2119 | J_ASSERT_JH(jh, jh->b_jlist == BJ_None); |
| 2120 | J_ASSERT_BH(bh, buffer_jbd(bh)); |
| 2121 | J_ASSERT_BH(bh, jh2bh(jh) == bh); |
| 2122 | BUFFER_TRACE(bh, "remove journal_head"); |
| 2123 | if (jh->b_frozen_data) { |
| 2124 | printk(KERN_WARNING "%s: freeing " |
| 2125 | "b_frozen_data\n", |
Harvey Harrison | 329d291 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 2126 | __func__); |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2127 | jbd2_free(jh->b_frozen_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2128 | } |
| 2129 | if (jh->b_committed_data) { |
| 2130 | printk(KERN_WARNING "%s: freeing " |
| 2131 | "b_committed_data\n", |
Harvey Harrison | 329d291 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 2132 | __func__); |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2133 | jbd2_free(jh->b_committed_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2134 | } |
| 2135 | bh->b_private = NULL; |
| 2136 | jh->b_bh = NULL; /* debug, really */ |
| 2137 | clear_buffer_jbd(bh); |
| 2138 | __brelse(bh); |
| 2139 | journal_free_journal_head(jh); |
| 2140 | } else { |
| 2141 | BUFFER_TRACE(bh, "journal_head was locked"); |
| 2142 | } |
| 2143 | } |
| 2144 | } |
| 2145 | |
| 2146 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2147 | * jbd2_journal_remove_journal_head(): if the buffer isn't attached to a transaction |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2148 | * and has a zero b_jcount then remove and release its journal_head. If we did |
| 2149 | * see that the buffer is not used by any transaction we also "logically" |
| 2150 | * decrement ->b_count. |
| 2151 | * |
| 2152 | * We in fact take an additional increment on ->b_count as a convenience, |
| 2153 | * because the caller usually wants to do additional things with the bh |
| 2154 | * after calling here. |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2155 | * The caller of jbd2_journal_remove_journal_head() *must* run __brelse(bh) at some |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2156 | * time. Once the caller has run __brelse(), the buffer is eligible for |
| 2157 | * reaping by try_to_free_buffers(). |
| 2158 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2159 | void jbd2_journal_remove_journal_head(struct buffer_head *bh) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2160 | { |
| 2161 | jbd_lock_bh_journal_head(bh); |
| 2162 | __journal_remove_journal_head(bh); |
| 2163 | jbd_unlock_bh_journal_head(bh); |
| 2164 | } |
| 2165 | |
| 2166 | /* |
| 2167 | * Drop a reference on the passed journal_head. If it fell to zero then try to |
| 2168 | * release the journal_head from the buffer_head. |
| 2169 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2170 | void jbd2_journal_put_journal_head(struct journal_head *jh) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2171 | { |
| 2172 | struct buffer_head *bh = jh2bh(jh); |
| 2173 | |
| 2174 | jbd_lock_bh_journal_head(bh); |
| 2175 | J_ASSERT_JH(jh, jh->b_jcount > 0); |
| 2176 | --jh->b_jcount; |
| 2177 | if (!jh->b_jcount && !jh->b_transaction) { |
| 2178 | __journal_remove_journal_head(bh); |
| 2179 | __brelse(bh); |
| 2180 | } |
| 2181 | jbd_unlock_bh_journal_head(bh); |
| 2182 | } |
| 2183 | |
| 2184 | /* |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2185 | * Initialize jbd inode head |
| 2186 | */ |
| 2187 | void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) |
| 2188 | { |
| 2189 | jinode->i_transaction = NULL; |
| 2190 | jinode->i_next_transaction = NULL; |
| 2191 | jinode->i_vfs_inode = inode; |
| 2192 | jinode->i_flags = 0; |
| 2193 | INIT_LIST_HEAD(&jinode->i_list); |
| 2194 | } |
| 2195 | |
| 2196 | /* |
| 2197 | * Function to be called before we start removing inode from memory (i.e., |
| 2198 | * clear_inode() is a fine place to be called from). It removes inode from |
| 2199 | * transaction's lists. |
| 2200 | */ |
| 2201 | void jbd2_journal_release_jbd_inode(journal_t *journal, |
| 2202 | struct jbd2_inode *jinode) |
| 2203 | { |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2204 | if (!journal) |
| 2205 | return; |
| 2206 | restart: |
| 2207 | spin_lock(&journal->j_list_lock); |
| 2208 | /* Is commit writing out inode - we have to wait */ |
| 2209 | if (jinode->i_flags & JI_COMMIT_RUNNING) { |
| 2210 | wait_queue_head_t *wq; |
| 2211 | DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); |
| 2212 | wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); |
| 2213 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
| 2214 | spin_unlock(&journal->j_list_lock); |
| 2215 | schedule(); |
| 2216 | finish_wait(wq, &wait.wait); |
| 2217 | goto restart; |
| 2218 | } |
| 2219 | |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2220 | if (jinode->i_transaction) { |
| 2221 | list_del(&jinode->i_list); |
| 2222 | jinode->i_transaction = NULL; |
| 2223 | } |
| 2224 | spin_unlock(&journal->j_list_lock); |
| 2225 | } |
| 2226 | |
| 2227 | /* |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2228 | * debugfs tunables |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2229 | */ |
Jose R. Santos | 6f38c74 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2230 | #ifdef CONFIG_JBD2_DEBUG |
| 2231 | u8 jbd2_journal_enable_debug __read_mostly; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2232 | EXPORT_SYMBOL(jbd2_journal_enable_debug); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2233 | |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2234 | #define JBD2_DEBUG_NAME "jbd2-debug" |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2235 | |
Jose R. Santos | 6f38c74 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2236 | static struct dentry *jbd2_debugfs_dir; |
| 2237 | static struct dentry *jbd2_debug; |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2238 | |
| 2239 | static void __init jbd2_create_debugfs_entry(void) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2240 | { |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2241 | jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL); |
| 2242 | if (jbd2_debugfs_dir) |
Yin Kangkai | 765f836 | 2009-12-15 14:48:25 -0800 | [diff] [blame] | 2243 | jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, |
| 2244 | S_IRUGO | S_IWUSR, |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2245 | jbd2_debugfs_dir, |
| 2246 | &jbd2_journal_enable_debug); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2247 | } |
| 2248 | |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2249 | static void __exit jbd2_remove_debugfs_entry(void) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2250 | { |
Jose R. Santos | 6f38c74 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 2251 | debugfs_remove(jbd2_debug); |
| 2252 | debugfs_remove(jbd2_debugfs_dir); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2253 | } |
| 2254 | |
| 2255 | #else |
| 2256 | |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2257 | static void __init jbd2_create_debugfs_entry(void) |
| 2258 | { |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2259 | } |
| 2260 | |
| 2261 | static void __exit jbd2_remove_debugfs_entry(void) |
| 2262 | { |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2263 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2264 | |
| 2265 | #endif |
| 2266 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2267 | #ifdef CONFIG_PROC_FS |
| 2268 | |
| 2269 | #define JBD2_STATS_PROC_NAME "fs/jbd2" |
| 2270 | |
| 2271 | static void __init jbd2_create_jbd_stats_proc_entry(void) |
| 2272 | { |
| 2273 | proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); |
| 2274 | } |
| 2275 | |
| 2276 | static void __exit jbd2_remove_jbd_stats_proc_entry(void) |
| 2277 | { |
| 2278 | if (proc_jbd2_stats) |
| 2279 | remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); |
| 2280 | } |
| 2281 | |
| 2282 | #else |
| 2283 | |
| 2284 | #define jbd2_create_jbd_stats_proc_entry() do {} while (0) |
| 2285 | #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) |
| 2286 | |
| 2287 | #endif |
| 2288 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 2289 | struct kmem_cache *jbd2_handle_cache; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2290 | |
| 2291 | static int __init journal_init_handle_cache(void) |
| 2292 | { |
Johann Lombardi | a920e94 | 2006-10-11 01:21:00 -0700 | [diff] [blame] | 2293 | jbd2_handle_cache = kmem_cache_create("jbd2_journal_handle", |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2294 | sizeof(handle_t), |
| 2295 | 0, /* offset */ |
Mingming Cao | 7716095 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2296 | SLAB_TEMPORARY, /* flags */ |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2297 | NULL); /* ctor */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2298 | if (jbd2_handle_cache == NULL) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2299 | printk(KERN_EMERG "JBD: failed to create handle cache\n"); |
| 2300 | return -ENOMEM; |
| 2301 | } |
| 2302 | return 0; |
| 2303 | } |
| 2304 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2305 | static void jbd2_journal_destroy_handle_cache(void) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2306 | { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2307 | if (jbd2_handle_cache) |
| 2308 | kmem_cache_destroy(jbd2_handle_cache); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2309 | } |
| 2310 | |
| 2311 | /* |
| 2312 | * Module startup and shutdown |
| 2313 | */ |
| 2314 | |
| 2315 | static int __init journal_init_caches(void) |
| 2316 | { |
| 2317 | int ret; |
| 2318 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2319 | ret = jbd2_journal_init_revoke_caches(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2320 | if (ret == 0) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2321 | ret = journal_init_jbd2_journal_head_cache(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2322 | if (ret == 0) |
| 2323 | ret = journal_init_handle_cache(); |
| 2324 | return ret; |
| 2325 | } |
| 2326 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2327 | static void jbd2_journal_destroy_caches(void) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2328 | { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2329 | jbd2_journal_destroy_revoke_caches(); |
| 2330 | jbd2_journal_destroy_jbd2_journal_head_cache(); |
| 2331 | jbd2_journal_destroy_handle_cache(); |
Theodore Ts'o | d2eecb0 | 2009-12-07 10:36:20 -0500 | [diff] [blame] | 2332 | jbd2_journal_destroy_slabs(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2333 | } |
| 2334 | |
| 2335 | static int __init journal_init(void) |
| 2336 | { |
| 2337 | int ret; |
| 2338 | |
| 2339 | BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); |
| 2340 | |
| 2341 | ret = journal_init_caches(); |
Duane Griffin | 620de4e | 2008-04-29 22:02:47 -0400 | [diff] [blame] | 2342 | if (ret == 0) { |
| 2343 | jbd2_create_debugfs_entry(); |
| 2344 | jbd2_create_jbd_stats_proc_entry(); |
| 2345 | } else { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2346 | jbd2_journal_destroy_caches(); |
Duane Griffin | 620de4e | 2008-04-29 22:02:47 -0400 | [diff] [blame] | 2347 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2348 | return ret; |
| 2349 | } |
| 2350 | |
| 2351 | static void __exit journal_exit(void) |
| 2352 | { |
Jose R. Santos | e23291b | 2007-07-18 08:57:06 -0400 | [diff] [blame] | 2353 | #ifdef CONFIG_JBD2_DEBUG |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2354 | int n = atomic_read(&nr_journal_heads); |
| 2355 | if (n) |
| 2356 | printk(KERN_EMERG "JBD: leaked %d journal_heads!\n", n); |
| 2357 | #endif |
Jose R. Santos | 0f49d5d | 2007-07-18 08:50:18 -0400 | [diff] [blame] | 2358 | jbd2_remove_debugfs_entry(); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 2359 | jbd2_remove_jbd_stats_proc_entry(); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2360 | jbd2_journal_destroy_caches(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2361 | } |
| 2362 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 2363 | /* |
| 2364 | * jbd2_dev_to_name is a utility function used by the jbd2 and ext4 |
| 2365 | * tracing infrastructure to map a dev_t to a device name. |
| 2366 | * |
| 2367 | * The caller should use rcu_read_lock() in order to make sure the |
| 2368 | * device name stays valid until its done with it. We use |
| 2369 | * rcu_read_lock() as well to make sure we're safe in case the caller |
| 2370 | * gets sloppy, and because rcu_read_lock() is cheap and can be safely |
| 2371 | * nested. |
| 2372 | */ |
| 2373 | struct devname_cache { |
| 2374 | struct rcu_head rcu; |
| 2375 | dev_t device; |
| 2376 | char devname[BDEVNAME_SIZE]; |
| 2377 | }; |
| 2378 | #define CACHE_SIZE_BITS 6 |
| 2379 | static struct devname_cache *devcache[1 << CACHE_SIZE_BITS]; |
| 2380 | static DEFINE_SPINLOCK(devname_cache_lock); |
| 2381 | |
| 2382 | static void free_devcache(struct rcu_head *rcu) |
| 2383 | { |
| 2384 | kfree(rcu); |
| 2385 | } |
| 2386 | |
| 2387 | const char *jbd2_dev_to_name(dev_t device) |
| 2388 | { |
| 2389 | int i = hash_32(device, CACHE_SIZE_BITS); |
| 2390 | char *ret; |
| 2391 | struct block_device *bd; |
Theodore Ts'o | b574480 | 2009-06-20 23:34:44 -0400 | [diff] [blame] | 2392 | static struct devname_cache *new_dev; |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 2393 | |
| 2394 | rcu_read_lock(); |
| 2395 | if (devcache[i] && devcache[i]->device == device) { |
| 2396 | ret = devcache[i]->devname; |
| 2397 | rcu_read_unlock(); |
| 2398 | return ret; |
| 2399 | } |
| 2400 | rcu_read_unlock(); |
| 2401 | |
Theodore Ts'o | b574480 | 2009-06-20 23:34:44 -0400 | [diff] [blame] | 2402 | new_dev = kmalloc(sizeof(struct devname_cache), GFP_KERNEL); |
| 2403 | if (!new_dev) |
| 2404 | return "NODEV-ALLOCFAILURE"; /* Something non-NULL */ |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 2405 | spin_lock(&devname_cache_lock); |
| 2406 | if (devcache[i]) { |
| 2407 | if (devcache[i]->device == device) { |
Theodore Ts'o | b574480 | 2009-06-20 23:34:44 -0400 | [diff] [blame] | 2408 | kfree(new_dev); |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 2409 | ret = devcache[i]->devname; |
| 2410 | spin_unlock(&devname_cache_lock); |
| 2411 | return ret; |
| 2412 | } |
| 2413 | call_rcu(&devcache[i]->rcu, free_devcache); |
| 2414 | } |
Theodore Ts'o | b574480 | 2009-06-20 23:34:44 -0400 | [diff] [blame] | 2415 | devcache[i] = new_dev; |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 2416 | devcache[i]->device = device; |
| 2417 | bd = bdget(device); |
| 2418 | if (bd) { |
| 2419 | bdevname(bd, devcache[i]->devname); |
| 2420 | bdput(bd); |
| 2421 | } else |
| 2422 | __bdevname(device, devcache[i]->devname); |
| 2423 | ret = devcache[i]->devname; |
| 2424 | spin_unlock(&devname_cache_lock); |
| 2425 | return ret; |
| 2426 | } |
| 2427 | EXPORT_SYMBOL(jbd2_dev_to_name); |
| 2428 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 2429 | MODULE_LICENSE("GPL"); |
| 2430 | module_init(journal_init); |
| 2431 | module_exit(journal_exit); |
| 2432 | |