1470decc6SDave Kleikamp /* 2f7f4bccbSMingming Cao * linux/fs/jbd2/journal.c 3470decc6SDave Kleikamp * 4470decc6SDave Kleikamp * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 5470decc6SDave Kleikamp * 6470decc6SDave Kleikamp * Copyright 1998 Red Hat corp --- All Rights Reserved 7470decc6SDave Kleikamp * 8470decc6SDave Kleikamp * This file is part of the Linux kernel and is made available under 9470decc6SDave Kleikamp * the terms of the GNU General Public License, version 2, or at your 10470decc6SDave Kleikamp * option, any later version, incorporated herein by reference. 11470decc6SDave Kleikamp * 12470decc6SDave Kleikamp * Generic filesystem journal-writing code; part of the ext2fs 13470decc6SDave Kleikamp * journaling system. 14470decc6SDave Kleikamp * 15470decc6SDave Kleikamp * This file manages journals: areas of disk reserved for logging 16470decc6SDave Kleikamp * transactional updates. This includes the kernel journaling thread 17470decc6SDave Kleikamp * which is responsible for scheduling updates to the log. 18470decc6SDave Kleikamp * 19470decc6SDave Kleikamp * We do not actually manage the physical storage of the journal in this 20470decc6SDave Kleikamp * file: that is left to a per-journal policy function, which allows us 21470decc6SDave Kleikamp * to store the journal within a filesystem-specified area for ext2 22470decc6SDave Kleikamp * journaling (ext2 can use a reserved inode for storing the log). 23470decc6SDave Kleikamp */ 24470decc6SDave Kleikamp 25470decc6SDave Kleikamp #include <linux/module.h> 26470decc6SDave Kleikamp #include <linux/time.h> 27470decc6SDave Kleikamp #include <linux/fs.h> 28f7f4bccbSMingming Cao #include <linux/jbd2.h> 29470decc6SDave Kleikamp #include <linux/errno.h> 30470decc6SDave Kleikamp #include <linux/slab.h> 31470decc6SDave Kleikamp #include <linux/init.h> 32470decc6SDave Kleikamp #include <linux/mm.h> 337dfb7103SNigel Cunningham #include <linux/freezer.h> 34470decc6SDave Kleikamp #include <linux/pagemap.h> 35470decc6SDave Kleikamp #include <linux/kthread.h> 36470decc6SDave Kleikamp #include <linux/poison.h> 37470decc6SDave Kleikamp #include <linux/proc_fs.h> 380f49d5d0SJose R. Santos #include <linux/debugfs.h> 398e85fb3fSJohann Lombardi #include <linux/seq_file.h> 40c225aa57SSimon Holm Thøgersen #include <linux/math64.h> 41470decc6SDave Kleikamp 42470decc6SDave Kleikamp #include <asm/uaccess.h> 43470decc6SDave Kleikamp #include <asm/page.h> 44470decc6SDave Kleikamp 45f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_start); 46f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_restart); 47f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_extend); 48f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_stop); 49f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_lock_updates); 50f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_unlock_updates); 51f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_write_access); 52f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_create_access); 53f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_undo_access); 54e06c8227SJoel Becker EXPORT_SYMBOL(jbd2_journal_set_triggers); 55f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_dirty_metadata); 56f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_release_buffer); 57f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_forget); 58470decc6SDave Kleikamp #if 0 59470decc6SDave Kleikamp EXPORT_SYMBOL(journal_sync_buffer); 60470decc6SDave Kleikamp #endif 61f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_flush); 62f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_revoke); 63470decc6SDave Kleikamp 64f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_init_dev); 65f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_init_inode); 66f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_update_format); 67f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_check_used_features); 68f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_check_available_features); 69f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_set_features); 70f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_load); 71f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_destroy); 72f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_abort); 73f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_errno); 74f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_ack_err); 75f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_clear_err); 76f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_log_wait_commit); 77f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_start_commit); 78f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_force_commit_nested); 79f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_wipe); 80f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_blocks_per_page); 81f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_invalidatepage); 82f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers); 83f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_force_commit); 84c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_file_inode); 85c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); 86c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); 87c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); 88470decc6SDave Kleikamp 89470decc6SDave Kleikamp static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *); 90470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno); 91470decc6SDave Kleikamp 92470decc6SDave Kleikamp /* 93470decc6SDave Kleikamp * Helper function used to manage commit timeouts 94470decc6SDave Kleikamp */ 95470decc6SDave Kleikamp 96470decc6SDave Kleikamp static void commit_timeout(unsigned long __data) 97470decc6SDave Kleikamp { 98470decc6SDave Kleikamp struct task_struct * p = (struct task_struct *) __data; 99470decc6SDave Kleikamp 100470decc6SDave Kleikamp wake_up_process(p); 101470decc6SDave Kleikamp } 102470decc6SDave Kleikamp 103470decc6SDave Kleikamp /* 104f7f4bccbSMingming Cao * kjournald2: The main thread function used to manage a logging device 105470decc6SDave Kleikamp * journal. 106470decc6SDave Kleikamp * 107470decc6SDave Kleikamp * This kernel thread is responsible for two things: 108470decc6SDave Kleikamp * 109470decc6SDave Kleikamp * 1) COMMIT: Every so often we need to commit the current state of the 110470decc6SDave Kleikamp * filesystem to disk. The journal thread is responsible for writing 111470decc6SDave Kleikamp * all of the metadata buffers to disk. 112470decc6SDave Kleikamp * 113470decc6SDave Kleikamp * 2) CHECKPOINT: We cannot reuse a used section of the log file until all 114470decc6SDave Kleikamp * of the data in that part of the log has been rewritten elsewhere on 115470decc6SDave Kleikamp * the disk. Flushing these old buffers to reclaim space in the log is 116470decc6SDave Kleikamp * known as checkpointing, and this thread is responsible for that job. 117470decc6SDave Kleikamp */ 118470decc6SDave Kleikamp 119f7f4bccbSMingming Cao static int kjournald2(void *arg) 120470decc6SDave Kleikamp { 121470decc6SDave Kleikamp journal_t *journal = arg; 122470decc6SDave Kleikamp transaction_t *transaction; 123470decc6SDave Kleikamp 124470decc6SDave Kleikamp /* 125470decc6SDave Kleikamp * Set up an interval timer which can be used to trigger a commit wakeup 126470decc6SDave Kleikamp * after the commit interval expires 127470decc6SDave Kleikamp */ 128470decc6SDave Kleikamp setup_timer(&journal->j_commit_timer, commit_timeout, 129470decc6SDave Kleikamp (unsigned long)current); 130470decc6SDave Kleikamp 131470decc6SDave Kleikamp /* Record that the journal thread is running */ 132470decc6SDave Kleikamp journal->j_task = current; 133470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 134470decc6SDave Kleikamp 1354a9bf99bSTheodore Ts'o printk(KERN_INFO "kjournald2 starting: pid %d, dev %s, " 1364a9bf99bSTheodore Ts'o "commit interval %ld seconds\n", current->pid, 1374a9bf99bSTheodore Ts'o journal->j_devname, journal->j_commit_interval / HZ); 138470decc6SDave Kleikamp 139470decc6SDave Kleikamp /* 140470decc6SDave Kleikamp * And now, wait forever for commit wakeup events. 141470decc6SDave Kleikamp */ 142470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 143470decc6SDave Kleikamp 144470decc6SDave Kleikamp loop: 145f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 146470decc6SDave Kleikamp goto end_loop; 147470decc6SDave Kleikamp 148470decc6SDave Kleikamp jbd_debug(1, "commit_sequence=%d, commit_request=%d\n", 149470decc6SDave Kleikamp journal->j_commit_sequence, journal->j_commit_request); 150470decc6SDave Kleikamp 151470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) { 152470decc6SDave Kleikamp jbd_debug(1, "OK, requests differ\n"); 153470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 154470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 155f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 156470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 157470decc6SDave Kleikamp goto loop; 158470decc6SDave Kleikamp } 159470decc6SDave Kleikamp 160470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 161470decc6SDave Kleikamp if (freezing(current)) { 162470decc6SDave Kleikamp /* 163470decc6SDave Kleikamp * The simpler the better. Flushing journal isn't a 164470decc6SDave Kleikamp * good idea, because that depends on threads that may 165470decc6SDave Kleikamp * be already stopped. 166470decc6SDave Kleikamp */ 167f7f4bccbSMingming Cao jbd_debug(1, "Now suspending kjournald2\n"); 168470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 169470decc6SDave Kleikamp refrigerator(); 170470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 171470decc6SDave Kleikamp } else { 172470decc6SDave Kleikamp /* 173470decc6SDave Kleikamp * We assume on resume that commits are already there, 174470decc6SDave Kleikamp * so we don't sleep 175470decc6SDave Kleikamp */ 176470decc6SDave Kleikamp DEFINE_WAIT(wait); 177470decc6SDave Kleikamp int should_sleep = 1; 178470decc6SDave Kleikamp 179470decc6SDave Kleikamp prepare_to_wait(&journal->j_wait_commit, &wait, 180470decc6SDave Kleikamp TASK_INTERRUPTIBLE); 181470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) 182470decc6SDave Kleikamp should_sleep = 0; 183470decc6SDave Kleikamp transaction = journal->j_running_transaction; 184470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, 185470decc6SDave Kleikamp transaction->t_expires)) 186470decc6SDave Kleikamp should_sleep = 0; 187f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 188470decc6SDave Kleikamp should_sleep = 0; 189470decc6SDave Kleikamp if (should_sleep) { 190470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 191470decc6SDave Kleikamp schedule(); 192470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 193470decc6SDave Kleikamp } 194470decc6SDave Kleikamp finish_wait(&journal->j_wait_commit, &wait); 195470decc6SDave Kleikamp } 196470decc6SDave Kleikamp 197f7f4bccbSMingming Cao jbd_debug(1, "kjournald2 wakes\n"); 198470decc6SDave Kleikamp 199470decc6SDave Kleikamp /* 200470decc6SDave Kleikamp * Were we woken up by a commit wakeup event? 201470decc6SDave Kleikamp */ 202470decc6SDave Kleikamp transaction = journal->j_running_transaction; 203470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, transaction->t_expires)) { 204470decc6SDave Kleikamp journal->j_commit_request = transaction->t_tid; 205470decc6SDave Kleikamp jbd_debug(1, "woke because of timeout\n"); 206470decc6SDave Kleikamp } 207470decc6SDave Kleikamp goto loop; 208470decc6SDave Kleikamp 209470decc6SDave Kleikamp end_loop: 210470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 211470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 212470decc6SDave Kleikamp journal->j_task = NULL; 213470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 214470decc6SDave Kleikamp jbd_debug(1, "Journal thread exiting.\n"); 215470decc6SDave Kleikamp return 0; 216470decc6SDave Kleikamp } 217470decc6SDave Kleikamp 21897f06784SPavel Emelianov static int jbd2_journal_start_thread(journal_t *journal) 219470decc6SDave Kleikamp { 22097f06784SPavel Emelianov struct task_struct *t; 22197f06784SPavel Emelianov 22297f06784SPavel Emelianov t = kthread_run(kjournald2, journal, "kjournald2"); 22397f06784SPavel Emelianov if (IS_ERR(t)) 22497f06784SPavel Emelianov return PTR_ERR(t); 22597f06784SPavel Emelianov 2261076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task != NULL); 22797f06784SPavel Emelianov return 0; 228470decc6SDave Kleikamp } 229470decc6SDave Kleikamp 230470decc6SDave Kleikamp static void journal_kill_thread(journal_t *journal) 231470decc6SDave Kleikamp { 232470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 233f7f4bccbSMingming Cao journal->j_flags |= JBD2_UNMOUNT; 234470decc6SDave Kleikamp 235470decc6SDave Kleikamp while (journal->j_task) { 236470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 237470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 2381076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task == NULL); 239470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 240470decc6SDave Kleikamp } 241470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 242470decc6SDave Kleikamp } 243470decc6SDave Kleikamp 244470decc6SDave Kleikamp /* 245f7f4bccbSMingming Cao * jbd2_journal_write_metadata_buffer: write a metadata buffer to the journal. 246470decc6SDave Kleikamp * 247470decc6SDave Kleikamp * Writes a metadata buffer to a given disk block. The actual IO is not 248470decc6SDave Kleikamp * performed but a new buffer_head is constructed which labels the data 249470decc6SDave Kleikamp * to be written with the correct destination disk block. 250470decc6SDave Kleikamp * 251470decc6SDave Kleikamp * Any magic-number escaping which needs to be done will cause a 252470decc6SDave Kleikamp * copy-out here. If the buffer happens to start with the 253f7f4bccbSMingming Cao * JBD2_MAGIC_NUMBER, then we can't write it to the log directly: the 254470decc6SDave Kleikamp * magic number is only written to the log for descripter blocks. In 255470decc6SDave Kleikamp * this case, we copy the data and replace the first word with 0, and we 256470decc6SDave Kleikamp * return a result code which indicates that this buffer needs to be 257470decc6SDave Kleikamp * marked as an escaped buffer in the corresponding log descriptor 258470decc6SDave Kleikamp * block. The missing word can then be restored when the block is read 259470decc6SDave Kleikamp * during recovery. 260470decc6SDave Kleikamp * 261470decc6SDave Kleikamp * If the source buffer has already been modified by a new transaction 262470decc6SDave Kleikamp * since we took the last commit snapshot, we use the frozen copy of 263470decc6SDave Kleikamp * that data for IO. If we end up using the existing buffer_head's data 264470decc6SDave Kleikamp * for the write, then we *have* to lock the buffer to prevent anyone 265470decc6SDave Kleikamp * else from using and possibly modifying it while the IO is in 266470decc6SDave Kleikamp * progress. 267470decc6SDave Kleikamp * 268470decc6SDave Kleikamp * The function returns a pointer to the buffer_heads to be used for IO. 269470decc6SDave Kleikamp * 270470decc6SDave Kleikamp * We assume that the journal has already been locked in this function. 271470decc6SDave Kleikamp * 272470decc6SDave Kleikamp * Return value: 273470decc6SDave Kleikamp * <0: Error 274470decc6SDave Kleikamp * >=0: Finished OK 275470decc6SDave Kleikamp * 276470decc6SDave Kleikamp * On success: 277470decc6SDave Kleikamp * Bit 0 set == escape performed on the data 278470decc6SDave Kleikamp * Bit 1 set == buffer copy-out performed (kfree the data after IO) 279470decc6SDave Kleikamp */ 280470decc6SDave Kleikamp 281f7f4bccbSMingming Cao int jbd2_journal_write_metadata_buffer(transaction_t *transaction, 282470decc6SDave Kleikamp struct journal_head *jh_in, 283470decc6SDave Kleikamp struct journal_head **jh_out, 28418eba7aaSMingming Cao unsigned long long blocknr) 285470decc6SDave Kleikamp { 286470decc6SDave Kleikamp int need_copy_out = 0; 287470decc6SDave Kleikamp int done_copy_out = 0; 288470decc6SDave Kleikamp int do_escape = 0; 289470decc6SDave Kleikamp char *mapped_data; 290470decc6SDave Kleikamp struct buffer_head *new_bh; 291470decc6SDave Kleikamp struct journal_head *new_jh; 292470decc6SDave Kleikamp struct page *new_page; 293470decc6SDave Kleikamp unsigned int new_offset; 294470decc6SDave Kleikamp struct buffer_head *bh_in = jh2bh(jh_in); 295e06c8227SJoel Becker struct jbd2_buffer_trigger_type *triggers; 296470decc6SDave Kleikamp 297470decc6SDave Kleikamp /* 298470decc6SDave Kleikamp * The buffer really shouldn't be locked: only the current committing 299470decc6SDave Kleikamp * transaction is allowed to write it, so nobody else is allowed 300470decc6SDave Kleikamp * to do any IO. 301470decc6SDave Kleikamp * 302470decc6SDave Kleikamp * akpm: except if we're journalling data, and write() output is 303470decc6SDave Kleikamp * also part of a shared mapping, and another thread has 304470decc6SDave Kleikamp * decided to launch a writepage() against this buffer. 305470decc6SDave Kleikamp */ 306470decc6SDave Kleikamp J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in)); 307470decc6SDave Kleikamp 308470decc6SDave Kleikamp new_bh = alloc_buffer_head(GFP_NOFS|__GFP_NOFAIL); 309470decc6SDave Kleikamp 310470decc6SDave Kleikamp /* 311470decc6SDave Kleikamp * If a new transaction has already done a buffer copy-out, then 312470decc6SDave Kleikamp * we use that version of the data for the commit. 313470decc6SDave Kleikamp */ 314470decc6SDave Kleikamp jbd_lock_bh_state(bh_in); 315470decc6SDave Kleikamp repeat: 316470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 317470decc6SDave Kleikamp done_copy_out = 1; 318470decc6SDave Kleikamp new_page = virt_to_page(jh_in->b_frozen_data); 319470decc6SDave Kleikamp new_offset = offset_in_page(jh_in->b_frozen_data); 320e06c8227SJoel Becker triggers = jh_in->b_frozen_triggers; 321470decc6SDave Kleikamp } else { 322470decc6SDave Kleikamp new_page = jh2bh(jh_in)->b_page; 323470decc6SDave Kleikamp new_offset = offset_in_page(jh2bh(jh_in)->b_data); 324e06c8227SJoel Becker triggers = jh_in->b_triggers; 325470decc6SDave Kleikamp } 326470decc6SDave Kleikamp 327470decc6SDave Kleikamp mapped_data = kmap_atomic(new_page, KM_USER0); 328470decc6SDave Kleikamp /* 329e06c8227SJoel Becker * Fire any commit trigger. Do this before checking for escaping, 330e06c8227SJoel Becker * as the trigger may modify the magic offset. If a copy-out 331e06c8227SJoel Becker * happens afterwards, it will have the correct data in the buffer. 332e06c8227SJoel Becker */ 333e06c8227SJoel Becker jbd2_buffer_commit_trigger(jh_in, mapped_data + new_offset, 334e06c8227SJoel Becker triggers); 335e06c8227SJoel Becker 336e06c8227SJoel Becker /* 337470decc6SDave Kleikamp * Check for escaping 338470decc6SDave Kleikamp */ 339470decc6SDave Kleikamp if (*((__be32 *)(mapped_data + new_offset)) == 340f7f4bccbSMingming Cao cpu_to_be32(JBD2_MAGIC_NUMBER)) { 341470decc6SDave Kleikamp need_copy_out = 1; 342470decc6SDave Kleikamp do_escape = 1; 343470decc6SDave Kleikamp } 344470decc6SDave Kleikamp kunmap_atomic(mapped_data, KM_USER0); 345470decc6SDave Kleikamp 346470decc6SDave Kleikamp /* 347470decc6SDave Kleikamp * Do we need to do a data copy? 348470decc6SDave Kleikamp */ 349470decc6SDave Kleikamp if (need_copy_out && !done_copy_out) { 350470decc6SDave Kleikamp char *tmp; 351470decc6SDave Kleikamp 352470decc6SDave Kleikamp jbd_unlock_bh_state(bh_in); 353af1e76d6SMingming Cao tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS); 354470decc6SDave Kleikamp jbd_lock_bh_state(bh_in); 355470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 356af1e76d6SMingming Cao jbd2_free(tmp, bh_in->b_size); 357470decc6SDave Kleikamp goto repeat; 358470decc6SDave Kleikamp } 359470decc6SDave Kleikamp 360470decc6SDave Kleikamp jh_in->b_frozen_data = tmp; 361470decc6SDave Kleikamp mapped_data = kmap_atomic(new_page, KM_USER0); 362470decc6SDave Kleikamp memcpy(tmp, mapped_data + new_offset, jh2bh(jh_in)->b_size); 363470decc6SDave Kleikamp kunmap_atomic(mapped_data, KM_USER0); 364470decc6SDave Kleikamp 365470decc6SDave Kleikamp new_page = virt_to_page(tmp); 366470decc6SDave Kleikamp new_offset = offset_in_page(tmp); 367470decc6SDave Kleikamp done_copy_out = 1; 368e06c8227SJoel Becker 369e06c8227SJoel Becker /* 370e06c8227SJoel Becker * This isn't strictly necessary, as we're using frozen 371e06c8227SJoel Becker * data for the escaping, but it keeps consistency with 372e06c8227SJoel Becker * b_frozen_data usage. 373e06c8227SJoel Becker */ 374e06c8227SJoel Becker jh_in->b_frozen_triggers = jh_in->b_triggers; 375470decc6SDave Kleikamp } 376470decc6SDave Kleikamp 377470decc6SDave Kleikamp /* 378470decc6SDave Kleikamp * Did we need to do an escaping? Now we've done all the 379470decc6SDave Kleikamp * copying, we can finally do so. 380470decc6SDave Kleikamp */ 381470decc6SDave Kleikamp if (do_escape) { 382470decc6SDave Kleikamp mapped_data = kmap_atomic(new_page, KM_USER0); 383470decc6SDave Kleikamp *((unsigned int *)(mapped_data + new_offset)) = 0; 384470decc6SDave Kleikamp kunmap_atomic(mapped_data, KM_USER0); 385470decc6SDave Kleikamp } 386470decc6SDave Kleikamp 387470decc6SDave Kleikamp /* keep subsequent assertions sane */ 388470decc6SDave Kleikamp new_bh->b_state = 0; 389470decc6SDave Kleikamp init_buffer(new_bh, NULL, NULL); 390470decc6SDave Kleikamp atomic_set(&new_bh->b_count, 1); 391470decc6SDave Kleikamp jbd_unlock_bh_state(bh_in); 392470decc6SDave Kleikamp 393f7f4bccbSMingming Cao new_jh = jbd2_journal_add_journal_head(new_bh); /* This sleeps */ 394470decc6SDave Kleikamp 395470decc6SDave Kleikamp set_bh_page(new_bh, new_page, new_offset); 396470decc6SDave Kleikamp new_jh->b_transaction = NULL; 397470decc6SDave Kleikamp new_bh->b_size = jh2bh(jh_in)->b_size; 398470decc6SDave Kleikamp new_bh->b_bdev = transaction->t_journal->j_dev; 399470decc6SDave Kleikamp new_bh->b_blocknr = blocknr; 400470decc6SDave Kleikamp set_buffer_mapped(new_bh); 401470decc6SDave Kleikamp set_buffer_dirty(new_bh); 402470decc6SDave Kleikamp 403470decc6SDave Kleikamp *jh_out = new_jh; 404470decc6SDave Kleikamp 405470decc6SDave Kleikamp /* 406470decc6SDave Kleikamp * The to-be-written buffer needs to get moved to the io queue, 407470decc6SDave Kleikamp * and the original buffer whose contents we are shadowing or 408470decc6SDave Kleikamp * copying is moved to the transaction's shadow queue. 409470decc6SDave Kleikamp */ 410470decc6SDave Kleikamp JBUFFER_TRACE(jh_in, "file as BJ_Shadow"); 411f7f4bccbSMingming Cao jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow); 412470decc6SDave Kleikamp JBUFFER_TRACE(new_jh, "file as BJ_IO"); 413f7f4bccbSMingming Cao jbd2_journal_file_buffer(new_jh, transaction, BJ_IO); 414470decc6SDave Kleikamp 415470decc6SDave Kleikamp return do_escape | (done_copy_out << 1); 416470decc6SDave Kleikamp } 417470decc6SDave Kleikamp 418470decc6SDave Kleikamp /* 419470decc6SDave Kleikamp * Allocation code for the journal file. Manage the space left in the 420470decc6SDave Kleikamp * journal, so that we can begin checkpointing when appropriate. 421470decc6SDave Kleikamp */ 422470decc6SDave Kleikamp 423470decc6SDave Kleikamp /* 424f7f4bccbSMingming Cao * __jbd2_log_space_left: Return the number of free blocks left in the journal. 425470decc6SDave Kleikamp * 426470decc6SDave Kleikamp * Called with the journal already locked. 427470decc6SDave Kleikamp * 428470decc6SDave Kleikamp * Called under j_state_lock 429470decc6SDave Kleikamp */ 430470decc6SDave Kleikamp 431f7f4bccbSMingming Cao int __jbd2_log_space_left(journal_t *journal) 432470decc6SDave Kleikamp { 433470decc6SDave Kleikamp int left = journal->j_free; 434470decc6SDave Kleikamp 435470decc6SDave Kleikamp assert_spin_locked(&journal->j_state_lock); 436470decc6SDave Kleikamp 437470decc6SDave Kleikamp /* 438470decc6SDave Kleikamp * Be pessimistic here about the number of those free blocks which 439470decc6SDave Kleikamp * might be required for log descriptor control blocks. 440470decc6SDave Kleikamp */ 441470decc6SDave Kleikamp 442470decc6SDave Kleikamp #define MIN_LOG_RESERVED_BLOCKS 32 /* Allow for rounding errors */ 443470decc6SDave Kleikamp 444470decc6SDave Kleikamp left -= MIN_LOG_RESERVED_BLOCKS; 445470decc6SDave Kleikamp 446470decc6SDave Kleikamp if (left <= 0) 447470decc6SDave Kleikamp return 0; 448470decc6SDave Kleikamp left -= (left >> 3); 449470decc6SDave Kleikamp return left; 450470decc6SDave Kleikamp } 451470decc6SDave Kleikamp 452470decc6SDave Kleikamp /* 453*c88ccea3SJan Kara * Called under j_state_lock. Returns true if a transaction commit was started. 454470decc6SDave Kleikamp */ 455f7f4bccbSMingming Cao int __jbd2_log_start_commit(journal_t *journal, tid_t target) 456470decc6SDave Kleikamp { 457470decc6SDave Kleikamp /* 458470decc6SDave Kleikamp * Are we already doing a recent enough commit? 459470decc6SDave Kleikamp */ 460470decc6SDave Kleikamp if (!tid_geq(journal->j_commit_request, target)) { 461470decc6SDave Kleikamp /* 462470decc6SDave Kleikamp * We want a new commit: OK, mark the request and wakup the 463470decc6SDave Kleikamp * commit thread. We do _not_ do the commit ourselves. 464470decc6SDave Kleikamp */ 465470decc6SDave Kleikamp 466470decc6SDave Kleikamp journal->j_commit_request = target; 467470decc6SDave Kleikamp jbd_debug(1, "JBD: requesting commit %d/%d\n", 468470decc6SDave Kleikamp journal->j_commit_request, 469470decc6SDave Kleikamp journal->j_commit_sequence); 470470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 471470decc6SDave Kleikamp return 1; 472470decc6SDave Kleikamp } 473470decc6SDave Kleikamp return 0; 474470decc6SDave Kleikamp } 475470decc6SDave Kleikamp 476f7f4bccbSMingming Cao int jbd2_log_start_commit(journal_t *journal, tid_t tid) 477470decc6SDave Kleikamp { 478470decc6SDave Kleikamp int ret; 479470decc6SDave Kleikamp 480470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 481f7f4bccbSMingming Cao ret = __jbd2_log_start_commit(journal, tid); 482470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 483470decc6SDave Kleikamp return ret; 484470decc6SDave Kleikamp } 485470decc6SDave Kleikamp 486470decc6SDave Kleikamp /* 487470decc6SDave Kleikamp * Force and wait upon a commit if the calling process is not within 488470decc6SDave Kleikamp * transaction. This is used for forcing out undo-protected data which contains 489470decc6SDave Kleikamp * bitmaps, when the fs is running out of space. 490470decc6SDave Kleikamp * 491470decc6SDave Kleikamp * We can only force the running transaction if we don't have an active handle; 492470decc6SDave Kleikamp * otherwise, we will deadlock. 493470decc6SDave Kleikamp * 494470decc6SDave Kleikamp * Returns true if a transaction was started. 495470decc6SDave Kleikamp */ 496f7f4bccbSMingming Cao int jbd2_journal_force_commit_nested(journal_t *journal) 497470decc6SDave Kleikamp { 498470decc6SDave Kleikamp transaction_t *transaction = NULL; 499470decc6SDave Kleikamp tid_t tid; 500470decc6SDave Kleikamp 501470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 502470decc6SDave Kleikamp if (journal->j_running_transaction && !current->journal_info) { 503470decc6SDave Kleikamp transaction = journal->j_running_transaction; 504f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 505470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 506470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 507470decc6SDave Kleikamp 508470decc6SDave Kleikamp if (!transaction) { 509470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 510470decc6SDave Kleikamp return 0; /* Nothing to retry */ 511470decc6SDave Kleikamp } 512470decc6SDave Kleikamp 513470decc6SDave Kleikamp tid = transaction->t_tid; 514470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 515f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 516470decc6SDave Kleikamp return 1; 517470decc6SDave Kleikamp } 518470decc6SDave Kleikamp 519470decc6SDave Kleikamp /* 520470decc6SDave Kleikamp * Start a commit of the current running transaction (if any). Returns true 521*c88ccea3SJan Kara * if a transaction is going to be committed (or is currently already 522*c88ccea3SJan Kara * committing), and fills its tid in at *ptid 523470decc6SDave Kleikamp */ 524f7f4bccbSMingming Cao int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) 525470decc6SDave Kleikamp { 526470decc6SDave Kleikamp int ret = 0; 527470decc6SDave Kleikamp 528470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 529470decc6SDave Kleikamp if (journal->j_running_transaction) { 530470decc6SDave Kleikamp tid_t tid = journal->j_running_transaction->t_tid; 531470decc6SDave Kleikamp 532*c88ccea3SJan Kara __jbd2_log_start_commit(journal, tid); 533*c88ccea3SJan Kara /* There's a running transaction and we've just made sure 534*c88ccea3SJan Kara * it's commit has been scheduled. */ 535*c88ccea3SJan Kara if (ptid) 536470decc6SDave Kleikamp *ptid = tid; 537*c88ccea3SJan Kara ret = 1; 538*c88ccea3SJan Kara } else if (journal->j_committing_transaction) { 539470decc6SDave Kleikamp /* 540470decc6SDave Kleikamp * If ext3_write_super() recently started a commit, then we 541470decc6SDave Kleikamp * have to wait for completion of that transaction 542470decc6SDave Kleikamp */ 543*c88ccea3SJan Kara if (ptid) 544470decc6SDave Kleikamp *ptid = journal->j_committing_transaction->t_tid; 545470decc6SDave Kleikamp ret = 1; 546470decc6SDave Kleikamp } 547470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 548470decc6SDave Kleikamp return ret; 549470decc6SDave Kleikamp } 550470decc6SDave Kleikamp 551470decc6SDave Kleikamp /* 552470decc6SDave Kleikamp * Wait for a specified commit to complete. 553470decc6SDave Kleikamp * The caller may not hold the journal lock. 554470decc6SDave Kleikamp */ 555f7f4bccbSMingming Cao int jbd2_log_wait_commit(journal_t *journal, tid_t tid) 556470decc6SDave Kleikamp { 557470decc6SDave Kleikamp int err = 0; 558470decc6SDave Kleikamp 559e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 560470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 561470decc6SDave Kleikamp if (!tid_geq(journal->j_commit_request, tid)) { 562470decc6SDave Kleikamp printk(KERN_EMERG 563470decc6SDave Kleikamp "%s: error: j_commit_request=%d, tid=%d\n", 564329d291fSHarvey Harrison __func__, journal->j_commit_request, tid); 565470decc6SDave Kleikamp } 566470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 567470decc6SDave Kleikamp #endif 568470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 569470decc6SDave Kleikamp while (tid_gt(tid, journal->j_commit_sequence)) { 570470decc6SDave Kleikamp jbd_debug(1, "JBD: want %d, j_commit_sequence=%d\n", 571470decc6SDave Kleikamp tid, journal->j_commit_sequence); 572470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 573470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 574470decc6SDave Kleikamp wait_event(journal->j_wait_done_commit, 575470decc6SDave Kleikamp !tid_gt(tid, journal->j_commit_sequence)); 576470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 577470decc6SDave Kleikamp } 578470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 579470decc6SDave Kleikamp 580470decc6SDave Kleikamp if (unlikely(is_journal_aborted(journal))) { 581470decc6SDave Kleikamp printk(KERN_EMERG "journal commit I/O error\n"); 582470decc6SDave Kleikamp err = -EIO; 583470decc6SDave Kleikamp } 584470decc6SDave Kleikamp return err; 585470decc6SDave Kleikamp } 586470decc6SDave Kleikamp 587470decc6SDave Kleikamp /* 588470decc6SDave Kleikamp * Log buffer allocation routines: 589470decc6SDave Kleikamp */ 590470decc6SDave Kleikamp 59118eba7aaSMingming Cao int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) 592470decc6SDave Kleikamp { 593470decc6SDave Kleikamp unsigned long blocknr; 594470decc6SDave Kleikamp 595470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 596470decc6SDave Kleikamp J_ASSERT(journal->j_free > 1); 597470decc6SDave Kleikamp 598470decc6SDave Kleikamp blocknr = journal->j_head; 599470decc6SDave Kleikamp journal->j_head++; 600470decc6SDave Kleikamp journal->j_free--; 601470decc6SDave Kleikamp if (journal->j_head == journal->j_last) 602470decc6SDave Kleikamp journal->j_head = journal->j_first; 603470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 604f7f4bccbSMingming Cao return jbd2_journal_bmap(journal, blocknr, retp); 605470decc6SDave Kleikamp } 606470decc6SDave Kleikamp 607470decc6SDave Kleikamp /* 608470decc6SDave Kleikamp * Conversion of logical to physical block numbers for the journal 609470decc6SDave Kleikamp * 610470decc6SDave Kleikamp * On external journals the journal blocks are identity-mapped, so 611470decc6SDave Kleikamp * this is a no-op. If needed, we can use j_blk_offset - everything is 612470decc6SDave Kleikamp * ready. 613470decc6SDave Kleikamp */ 614f7f4bccbSMingming Cao int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, 61518eba7aaSMingming Cao unsigned long long *retp) 616470decc6SDave Kleikamp { 617470decc6SDave Kleikamp int err = 0; 61818eba7aaSMingming Cao unsigned long long ret; 619470decc6SDave Kleikamp 620470decc6SDave Kleikamp if (journal->j_inode) { 621470decc6SDave Kleikamp ret = bmap(journal->j_inode, blocknr); 622470decc6SDave Kleikamp if (ret) 623470decc6SDave Kleikamp *retp = ret; 624470decc6SDave Kleikamp else { 625470decc6SDave Kleikamp printk(KERN_ALERT "%s: journal block not found " 626470decc6SDave Kleikamp "at offset %lu on %s\n", 62705496769STheodore Ts'o __func__, blocknr, journal->j_devname); 628470decc6SDave Kleikamp err = -EIO; 629470decc6SDave Kleikamp __journal_abort_soft(journal, err); 630470decc6SDave Kleikamp } 631470decc6SDave Kleikamp } else { 632470decc6SDave Kleikamp *retp = blocknr; /* +journal->j_blk_offset */ 633470decc6SDave Kleikamp } 634470decc6SDave Kleikamp return err; 635470decc6SDave Kleikamp } 636470decc6SDave Kleikamp 637470decc6SDave Kleikamp /* 638470decc6SDave Kleikamp * We play buffer_head aliasing tricks to write data/metadata blocks to 639470decc6SDave Kleikamp * the journal without copying their contents, but for journal 640470decc6SDave Kleikamp * descriptor blocks we do need to generate bona fide buffers. 641470decc6SDave Kleikamp * 642f7f4bccbSMingming Cao * After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying 643470decc6SDave Kleikamp * the buffer's contents they really should run flush_dcache_page(bh->b_page). 644470decc6SDave Kleikamp * But we don't bother doing that, so there will be coherency problems with 645470decc6SDave Kleikamp * mmaps of blockdevs which hold live JBD-controlled filesystems. 646470decc6SDave Kleikamp */ 647f7f4bccbSMingming Cao struct journal_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) 648470decc6SDave Kleikamp { 649470decc6SDave Kleikamp struct buffer_head *bh; 65018eba7aaSMingming Cao unsigned long long blocknr; 651470decc6SDave Kleikamp int err; 652470decc6SDave Kleikamp 653f7f4bccbSMingming Cao err = jbd2_journal_next_log_block(journal, &blocknr); 654470decc6SDave Kleikamp 655470decc6SDave Kleikamp if (err) 656470decc6SDave Kleikamp return NULL; 657470decc6SDave Kleikamp 658470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 6594b905671SJan Kara if (!bh) 6604b905671SJan Kara return NULL; 661470decc6SDave Kleikamp lock_buffer(bh); 662470decc6SDave Kleikamp memset(bh->b_data, 0, journal->j_blocksize); 663470decc6SDave Kleikamp set_buffer_uptodate(bh); 664470decc6SDave Kleikamp unlock_buffer(bh); 665470decc6SDave Kleikamp BUFFER_TRACE(bh, "return this buffer"); 666f7f4bccbSMingming Cao return jbd2_journal_add_journal_head(bh); 667470decc6SDave Kleikamp } 668470decc6SDave Kleikamp 6698e85fb3fSJohann Lombardi struct jbd2_stats_proc_session { 6708e85fb3fSJohann Lombardi journal_t *journal; 6718e85fb3fSJohann Lombardi struct transaction_stats_s *stats; 6728e85fb3fSJohann Lombardi int start; 6738e85fb3fSJohann Lombardi int max; 6748e85fb3fSJohann Lombardi }; 6758e85fb3fSJohann Lombardi 6768e85fb3fSJohann Lombardi static void *jbd2_history_skip_empty(struct jbd2_stats_proc_session *s, 6778e85fb3fSJohann Lombardi struct transaction_stats_s *ts, 6788e85fb3fSJohann Lombardi int first) 6798e85fb3fSJohann Lombardi { 6808e85fb3fSJohann Lombardi if (ts == s->stats + s->max) 6818e85fb3fSJohann Lombardi ts = s->stats; 6828e85fb3fSJohann Lombardi if (!first && ts == s->stats + s->start) 6838e85fb3fSJohann Lombardi return NULL; 6848e85fb3fSJohann Lombardi while (ts->ts_type == 0) { 6858e85fb3fSJohann Lombardi ts++; 6868e85fb3fSJohann Lombardi if (ts == s->stats + s->max) 6878e85fb3fSJohann Lombardi ts = s->stats; 6888e85fb3fSJohann Lombardi if (ts == s->stats + s->start) 6898e85fb3fSJohann Lombardi return NULL; 6908e85fb3fSJohann Lombardi } 6918e85fb3fSJohann Lombardi return ts; 6928e85fb3fSJohann Lombardi 6938e85fb3fSJohann Lombardi } 6948e85fb3fSJohann Lombardi 6958e85fb3fSJohann Lombardi static void *jbd2_seq_history_start(struct seq_file *seq, loff_t *pos) 6968e85fb3fSJohann Lombardi { 6978e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 6988e85fb3fSJohann Lombardi struct transaction_stats_s *ts; 6998e85fb3fSJohann Lombardi int l = *pos; 7008e85fb3fSJohann Lombardi 7018e85fb3fSJohann Lombardi if (l == 0) 7028e85fb3fSJohann Lombardi return SEQ_START_TOKEN; 7038e85fb3fSJohann Lombardi ts = jbd2_history_skip_empty(s, s->stats + s->start, 1); 7048e85fb3fSJohann Lombardi if (!ts) 7058e85fb3fSJohann Lombardi return NULL; 7068e85fb3fSJohann Lombardi l--; 7078e85fb3fSJohann Lombardi while (l) { 7088e85fb3fSJohann Lombardi ts = jbd2_history_skip_empty(s, ++ts, 0); 7098e85fb3fSJohann Lombardi if (!ts) 7108e85fb3fSJohann Lombardi break; 7118e85fb3fSJohann Lombardi l--; 7128e85fb3fSJohann Lombardi } 7138e85fb3fSJohann Lombardi return ts; 7148e85fb3fSJohann Lombardi } 7158e85fb3fSJohann Lombardi 7168e85fb3fSJohann Lombardi static void *jbd2_seq_history_next(struct seq_file *seq, void *v, loff_t *pos) 7178e85fb3fSJohann Lombardi { 7188e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 7198e85fb3fSJohann Lombardi struct transaction_stats_s *ts = v; 7208e85fb3fSJohann Lombardi 7218e85fb3fSJohann Lombardi ++*pos; 7228e85fb3fSJohann Lombardi if (v == SEQ_START_TOKEN) 7238e85fb3fSJohann Lombardi return jbd2_history_skip_empty(s, s->stats + s->start, 1); 7248e85fb3fSJohann Lombardi else 7258e85fb3fSJohann Lombardi return jbd2_history_skip_empty(s, ++ts, 0); 7268e85fb3fSJohann Lombardi } 7278e85fb3fSJohann Lombardi 7288e85fb3fSJohann Lombardi static int jbd2_seq_history_show(struct seq_file *seq, void *v) 7298e85fb3fSJohann Lombardi { 7308e85fb3fSJohann Lombardi struct transaction_stats_s *ts = v; 7318e85fb3fSJohann Lombardi if (v == SEQ_START_TOKEN) { 7328e85fb3fSJohann Lombardi seq_printf(seq, "%-4s %-5s %-5s %-5s %-5s %-5s %-5s %-6s %-5s " 7338e85fb3fSJohann Lombardi "%-5s %-5s %-5s %-5s %-5s\n", "R/C", "tid", 7348e85fb3fSJohann Lombardi "wait", "run", "lock", "flush", "log", "hndls", 7358e85fb3fSJohann Lombardi "block", "inlog", "ctime", "write", "drop", 7368e85fb3fSJohann Lombardi "close"); 7378e85fb3fSJohann Lombardi return 0; 7388e85fb3fSJohann Lombardi } 7398e85fb3fSJohann Lombardi if (ts->ts_type == JBD2_STATS_RUN) 7408e85fb3fSJohann Lombardi seq_printf(seq, "%-4s %-5lu %-5u %-5u %-5u %-5u %-5u " 7418e85fb3fSJohann Lombardi "%-6lu %-5lu %-5lu\n", "R", ts->ts_tid, 7428e85fb3fSJohann Lombardi jiffies_to_msecs(ts->u.run.rs_wait), 7438e85fb3fSJohann Lombardi jiffies_to_msecs(ts->u.run.rs_running), 7448e85fb3fSJohann Lombardi jiffies_to_msecs(ts->u.run.rs_locked), 7458e85fb3fSJohann Lombardi jiffies_to_msecs(ts->u.run.rs_flushing), 7468e85fb3fSJohann Lombardi jiffies_to_msecs(ts->u.run.rs_logging), 7478e85fb3fSJohann Lombardi ts->u.run.rs_handle_count, 7488e85fb3fSJohann Lombardi ts->u.run.rs_blocks, 7498e85fb3fSJohann Lombardi ts->u.run.rs_blocks_logged); 7508e85fb3fSJohann Lombardi else if (ts->ts_type == JBD2_STATS_CHECKPOINT) 7518e85fb3fSJohann Lombardi seq_printf(seq, "%-4s %-5lu %48s %-5u %-5lu %-5lu %-5lu\n", 7528e85fb3fSJohann Lombardi "C", ts->ts_tid, " ", 7538e85fb3fSJohann Lombardi jiffies_to_msecs(ts->u.chp.cs_chp_time), 7548e85fb3fSJohann Lombardi ts->u.chp.cs_written, ts->u.chp.cs_dropped, 7558e85fb3fSJohann Lombardi ts->u.chp.cs_forced_to_close); 7568e85fb3fSJohann Lombardi else 7578e85fb3fSJohann Lombardi J_ASSERT(0); 7588e85fb3fSJohann Lombardi return 0; 7598e85fb3fSJohann Lombardi } 7608e85fb3fSJohann Lombardi 7618e85fb3fSJohann Lombardi static void jbd2_seq_history_stop(struct seq_file *seq, void *v) 7628e85fb3fSJohann Lombardi { 7638e85fb3fSJohann Lombardi } 7648e85fb3fSJohann Lombardi 7658e85fb3fSJohann Lombardi static struct seq_operations jbd2_seq_history_ops = { 7668e85fb3fSJohann Lombardi .start = jbd2_seq_history_start, 7678e85fb3fSJohann Lombardi .next = jbd2_seq_history_next, 7688e85fb3fSJohann Lombardi .stop = jbd2_seq_history_stop, 7698e85fb3fSJohann Lombardi .show = jbd2_seq_history_show, 7708e85fb3fSJohann Lombardi }; 7718e85fb3fSJohann Lombardi 7728e85fb3fSJohann Lombardi static int jbd2_seq_history_open(struct inode *inode, struct file *file) 7738e85fb3fSJohann Lombardi { 7748e85fb3fSJohann Lombardi journal_t *journal = PDE(inode)->data; 7758e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 7768e85fb3fSJohann Lombardi int rc, size; 7778e85fb3fSJohann Lombardi 7788e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 7798e85fb3fSJohann Lombardi if (s == NULL) 7808e85fb3fSJohann Lombardi return -ENOMEM; 7818e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s) * journal->j_history_max; 7828e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 7838e85fb3fSJohann Lombardi if (s->stats == NULL) { 7848e85fb3fSJohann Lombardi kfree(s); 7858e85fb3fSJohann Lombardi return -ENOMEM; 7868e85fb3fSJohann Lombardi } 7878e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 7888e85fb3fSJohann Lombardi memcpy(s->stats, journal->j_history, size); 7898e85fb3fSJohann Lombardi s->max = journal->j_history_max; 7908e85fb3fSJohann Lombardi s->start = journal->j_history_cur % s->max; 7918e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 7928e85fb3fSJohann Lombardi 7938e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_history_ops); 7948e85fb3fSJohann Lombardi if (rc == 0) { 7958e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 7968e85fb3fSJohann Lombardi m->private = s; 7978e85fb3fSJohann Lombardi } else { 7988e85fb3fSJohann Lombardi kfree(s->stats); 7998e85fb3fSJohann Lombardi kfree(s); 8008e85fb3fSJohann Lombardi } 8018e85fb3fSJohann Lombardi return rc; 8028e85fb3fSJohann Lombardi 8038e85fb3fSJohann Lombardi } 8048e85fb3fSJohann Lombardi 8058e85fb3fSJohann Lombardi static int jbd2_seq_history_release(struct inode *inode, struct file *file) 8068e85fb3fSJohann Lombardi { 8078e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 8088e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 8098e85fb3fSJohann Lombardi 8108e85fb3fSJohann Lombardi kfree(s->stats); 8118e85fb3fSJohann Lombardi kfree(s); 8128e85fb3fSJohann Lombardi return seq_release(inode, file); 8138e85fb3fSJohann Lombardi } 8148e85fb3fSJohann Lombardi 8158e85fb3fSJohann Lombardi static struct file_operations jbd2_seq_history_fops = { 8168e85fb3fSJohann Lombardi .owner = THIS_MODULE, 8178e85fb3fSJohann Lombardi .open = jbd2_seq_history_open, 8188e85fb3fSJohann Lombardi .read = seq_read, 8198e85fb3fSJohann Lombardi .llseek = seq_lseek, 8208e85fb3fSJohann Lombardi .release = jbd2_seq_history_release, 8218e85fb3fSJohann Lombardi }; 8228e85fb3fSJohann Lombardi 8238e85fb3fSJohann Lombardi static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) 8248e85fb3fSJohann Lombardi { 8258e85fb3fSJohann Lombardi return *pos ? NULL : SEQ_START_TOKEN; 8268e85fb3fSJohann Lombardi } 8278e85fb3fSJohann Lombardi 8288e85fb3fSJohann Lombardi static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) 8298e85fb3fSJohann Lombardi { 8308e85fb3fSJohann Lombardi return NULL; 8318e85fb3fSJohann Lombardi } 8328e85fb3fSJohann Lombardi 8338e85fb3fSJohann Lombardi static int jbd2_seq_info_show(struct seq_file *seq, void *v) 8348e85fb3fSJohann Lombardi { 8358e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 8368e85fb3fSJohann Lombardi 8378e85fb3fSJohann Lombardi if (v != SEQ_START_TOKEN) 8388e85fb3fSJohann Lombardi return 0; 8398e85fb3fSJohann Lombardi seq_printf(seq, "%lu transaction, each upto %u blocks\n", 8408e85fb3fSJohann Lombardi s->stats->ts_tid, 8418e85fb3fSJohann Lombardi s->journal->j_max_transaction_buffers); 8428e85fb3fSJohann Lombardi if (s->stats->ts_tid == 0) 8438e85fb3fSJohann Lombardi return 0; 8448e85fb3fSJohann Lombardi seq_printf(seq, "average: \n %ums waiting for transaction\n", 8458e85fb3fSJohann Lombardi jiffies_to_msecs(s->stats->u.run.rs_wait / s->stats->ts_tid)); 8468e85fb3fSJohann Lombardi seq_printf(seq, " %ums running transaction\n", 8478e85fb3fSJohann Lombardi jiffies_to_msecs(s->stats->u.run.rs_running / s->stats->ts_tid)); 8488e85fb3fSJohann Lombardi seq_printf(seq, " %ums transaction was being locked\n", 8498e85fb3fSJohann Lombardi jiffies_to_msecs(s->stats->u.run.rs_locked / s->stats->ts_tid)); 8508e85fb3fSJohann Lombardi seq_printf(seq, " %ums flushing data (in ordered mode)\n", 8518e85fb3fSJohann Lombardi jiffies_to_msecs(s->stats->u.run.rs_flushing / s->stats->ts_tid)); 8528e85fb3fSJohann Lombardi seq_printf(seq, " %ums logging transaction\n", 8538e85fb3fSJohann Lombardi jiffies_to_msecs(s->stats->u.run.rs_logging / s->stats->ts_tid)); 854c225aa57SSimon Holm Thøgersen seq_printf(seq, " %lluus average transaction commit time\n", 855c225aa57SSimon Holm Thøgersen div_u64(s->journal->j_average_commit_time, 1000)); 8568e85fb3fSJohann Lombardi seq_printf(seq, " %lu handles per transaction\n", 8578e85fb3fSJohann Lombardi s->stats->u.run.rs_handle_count / s->stats->ts_tid); 8588e85fb3fSJohann Lombardi seq_printf(seq, " %lu blocks per transaction\n", 8598e85fb3fSJohann Lombardi s->stats->u.run.rs_blocks / s->stats->ts_tid); 8608e85fb3fSJohann Lombardi seq_printf(seq, " %lu logged blocks per transaction\n", 8618e85fb3fSJohann Lombardi s->stats->u.run.rs_blocks_logged / s->stats->ts_tid); 8628e85fb3fSJohann Lombardi return 0; 8638e85fb3fSJohann Lombardi } 8648e85fb3fSJohann Lombardi 8658e85fb3fSJohann Lombardi static void jbd2_seq_info_stop(struct seq_file *seq, void *v) 8668e85fb3fSJohann Lombardi { 8678e85fb3fSJohann Lombardi } 8688e85fb3fSJohann Lombardi 8698e85fb3fSJohann Lombardi static struct seq_operations jbd2_seq_info_ops = { 8708e85fb3fSJohann Lombardi .start = jbd2_seq_info_start, 8718e85fb3fSJohann Lombardi .next = jbd2_seq_info_next, 8728e85fb3fSJohann Lombardi .stop = jbd2_seq_info_stop, 8738e85fb3fSJohann Lombardi .show = jbd2_seq_info_show, 8748e85fb3fSJohann Lombardi }; 8758e85fb3fSJohann Lombardi 8768e85fb3fSJohann Lombardi static int jbd2_seq_info_open(struct inode *inode, struct file *file) 8778e85fb3fSJohann Lombardi { 8788e85fb3fSJohann Lombardi journal_t *journal = PDE(inode)->data; 8798e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 8808e85fb3fSJohann Lombardi int rc, size; 8818e85fb3fSJohann Lombardi 8828e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 8838e85fb3fSJohann Lombardi if (s == NULL) 8848e85fb3fSJohann Lombardi return -ENOMEM; 8858e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s); 8868e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 8878e85fb3fSJohann Lombardi if (s->stats == NULL) { 8888e85fb3fSJohann Lombardi kfree(s); 8898e85fb3fSJohann Lombardi return -ENOMEM; 8908e85fb3fSJohann Lombardi } 8918e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 8928e85fb3fSJohann Lombardi memcpy(s->stats, &journal->j_stats, size); 8938e85fb3fSJohann Lombardi s->journal = journal; 8948e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 8958e85fb3fSJohann Lombardi 8968e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_info_ops); 8978e85fb3fSJohann Lombardi if (rc == 0) { 8988e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 8998e85fb3fSJohann Lombardi m->private = s; 9008e85fb3fSJohann Lombardi } else { 9018e85fb3fSJohann Lombardi kfree(s->stats); 9028e85fb3fSJohann Lombardi kfree(s); 9038e85fb3fSJohann Lombardi } 9048e85fb3fSJohann Lombardi return rc; 9058e85fb3fSJohann Lombardi 9068e85fb3fSJohann Lombardi } 9078e85fb3fSJohann Lombardi 9088e85fb3fSJohann Lombardi static int jbd2_seq_info_release(struct inode *inode, struct file *file) 9098e85fb3fSJohann Lombardi { 9108e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 9118e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 9128e85fb3fSJohann Lombardi kfree(s->stats); 9138e85fb3fSJohann Lombardi kfree(s); 9148e85fb3fSJohann Lombardi return seq_release(inode, file); 9158e85fb3fSJohann Lombardi } 9168e85fb3fSJohann Lombardi 9178e85fb3fSJohann Lombardi static struct file_operations jbd2_seq_info_fops = { 9188e85fb3fSJohann Lombardi .owner = THIS_MODULE, 9198e85fb3fSJohann Lombardi .open = jbd2_seq_info_open, 9208e85fb3fSJohann Lombardi .read = seq_read, 9218e85fb3fSJohann Lombardi .llseek = seq_lseek, 9228e85fb3fSJohann Lombardi .release = jbd2_seq_info_release, 9238e85fb3fSJohann Lombardi }; 9248e85fb3fSJohann Lombardi 9258e85fb3fSJohann Lombardi static struct proc_dir_entry *proc_jbd2_stats; 9268e85fb3fSJohann Lombardi 9278e85fb3fSJohann Lombardi static void jbd2_stats_proc_init(journal_t *journal) 9288e85fb3fSJohann Lombardi { 92905496769STheodore Ts'o journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); 9308e85fb3fSJohann Lombardi if (journal->j_proc_entry) { 93179da3664SDenis V. Lunev proc_create_data("history", S_IRUGO, journal->j_proc_entry, 93279da3664SDenis V. Lunev &jbd2_seq_history_fops, journal); 93379da3664SDenis V. Lunev proc_create_data("info", S_IRUGO, journal->j_proc_entry, 93479da3664SDenis V. Lunev &jbd2_seq_info_fops, journal); 9358e85fb3fSJohann Lombardi } 9368e85fb3fSJohann Lombardi } 9378e85fb3fSJohann Lombardi 9388e85fb3fSJohann Lombardi static void jbd2_stats_proc_exit(journal_t *journal) 9398e85fb3fSJohann Lombardi { 9408e85fb3fSJohann Lombardi remove_proc_entry("info", journal->j_proc_entry); 9418e85fb3fSJohann Lombardi remove_proc_entry("history", journal->j_proc_entry); 94205496769STheodore Ts'o remove_proc_entry(journal->j_devname, proc_jbd2_stats); 9438e85fb3fSJohann Lombardi } 9448e85fb3fSJohann Lombardi 9458e85fb3fSJohann Lombardi static void journal_init_stats(journal_t *journal) 9468e85fb3fSJohann Lombardi { 9478e85fb3fSJohann Lombardi int size; 9488e85fb3fSJohann Lombardi 9498e85fb3fSJohann Lombardi if (!proc_jbd2_stats) 9508e85fb3fSJohann Lombardi return; 9518e85fb3fSJohann Lombardi 9528e85fb3fSJohann Lombardi journal->j_history_max = 100; 9538e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s) * journal->j_history_max; 9548e85fb3fSJohann Lombardi journal->j_history = kzalloc(size, GFP_KERNEL); 9558e85fb3fSJohann Lombardi if (!journal->j_history) { 9568e85fb3fSJohann Lombardi journal->j_history_max = 0; 9578e85fb3fSJohann Lombardi return; 9588e85fb3fSJohann Lombardi } 9598e85fb3fSJohann Lombardi spin_lock_init(&journal->j_history_lock); 9608e85fb3fSJohann Lombardi } 9618e85fb3fSJohann Lombardi 962470decc6SDave Kleikamp /* 963470decc6SDave Kleikamp * Management for journal control blocks: functions to create and 964470decc6SDave Kleikamp * destroy journal_t structures, and to initialise and read existing 965470decc6SDave Kleikamp * journal blocks from disk. */ 966470decc6SDave Kleikamp 967470decc6SDave Kleikamp /* First: create and setup a journal_t object in memory. We initialise 968470decc6SDave Kleikamp * very few fields yet: that has to wait until we have created the 969470decc6SDave Kleikamp * journal structures from from scratch, or loaded them from disk. */ 970470decc6SDave Kleikamp 971470decc6SDave Kleikamp static journal_t * journal_init_common (void) 972470decc6SDave Kleikamp { 973470decc6SDave Kleikamp journal_t *journal; 974470decc6SDave Kleikamp int err; 975470decc6SDave Kleikamp 976d802ffa8SMingming Cao journal = kzalloc(sizeof(*journal), GFP_KERNEL|__GFP_NOFAIL); 977470decc6SDave Kleikamp if (!journal) 978470decc6SDave Kleikamp goto fail; 979470decc6SDave Kleikamp 980470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_transaction_locked); 981470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_logspace); 982470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_done_commit); 983470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_checkpoint); 984470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_commit); 985470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_updates); 986470decc6SDave Kleikamp mutex_init(&journal->j_barrier); 987470decc6SDave Kleikamp mutex_init(&journal->j_checkpoint_mutex); 988470decc6SDave Kleikamp spin_lock_init(&journal->j_revoke_lock); 989470decc6SDave Kleikamp spin_lock_init(&journal->j_list_lock); 990470decc6SDave Kleikamp spin_lock_init(&journal->j_state_lock); 991470decc6SDave Kleikamp 992cd02ff0bSMingming Cao journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); 99330773840STheodore Ts'o journal->j_min_batch_time = 0; 99430773840STheodore Ts'o journal->j_max_batch_time = 15000; /* 15ms */ 995470decc6SDave Kleikamp 996470decc6SDave Kleikamp /* The journal is marked for error until we succeed with recovery! */ 997f7f4bccbSMingming Cao journal->j_flags = JBD2_ABORT; 998470decc6SDave Kleikamp 999470decc6SDave Kleikamp /* Set up a default-sized revoke table for the new mount. */ 1000f7f4bccbSMingming Cao err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); 1001470decc6SDave Kleikamp if (err) { 1002470decc6SDave Kleikamp kfree(journal); 1003470decc6SDave Kleikamp goto fail; 1004470decc6SDave Kleikamp } 10058e85fb3fSJohann Lombardi 10068e85fb3fSJohann Lombardi journal_init_stats(journal); 10078e85fb3fSJohann Lombardi 1008470decc6SDave Kleikamp return journal; 1009470decc6SDave Kleikamp fail: 1010470decc6SDave Kleikamp return NULL; 1011470decc6SDave Kleikamp } 1012470decc6SDave Kleikamp 1013f7f4bccbSMingming Cao /* jbd2_journal_init_dev and jbd2_journal_init_inode: 1014470decc6SDave Kleikamp * 1015470decc6SDave Kleikamp * Create a journal structure assigned some fixed set of disk blocks to 1016470decc6SDave Kleikamp * the journal. We don't actually touch those disk blocks yet, but we 1017470decc6SDave Kleikamp * need to set up all of the mapping information to tell the journaling 1018470decc6SDave Kleikamp * system where the journal blocks are. 1019470decc6SDave Kleikamp * 1020470decc6SDave Kleikamp */ 1021470decc6SDave Kleikamp 1022470decc6SDave Kleikamp /** 10235648ba5bSRandy Dunlap * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure 1024470decc6SDave Kleikamp * @bdev: Block device on which to create the journal 1025470decc6SDave Kleikamp * @fs_dev: Device which hold journalled filesystem for this journal. 1026470decc6SDave Kleikamp * @start: Block nr Start of journal. 1027470decc6SDave Kleikamp * @len: Length of the journal in blocks. 1028470decc6SDave Kleikamp * @blocksize: blocksize of journalling device 10295648ba5bSRandy Dunlap * 10305648ba5bSRandy Dunlap * Returns: a newly created journal_t * 1031470decc6SDave Kleikamp * 1032f7f4bccbSMingming Cao * jbd2_journal_init_dev creates a journal which maps a fixed contiguous 1033470decc6SDave Kleikamp * range of blocks on an arbitrary block device. 1034470decc6SDave Kleikamp * 1035470decc6SDave Kleikamp */ 1036f7f4bccbSMingming Cao journal_t * jbd2_journal_init_dev(struct block_device *bdev, 1037470decc6SDave Kleikamp struct block_device *fs_dev, 103818eba7aaSMingming Cao unsigned long long start, int len, int blocksize) 1039470decc6SDave Kleikamp { 1040470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 1041470decc6SDave Kleikamp struct buffer_head *bh; 104205496769STheodore Ts'o char *p; 1043470decc6SDave Kleikamp int n; 1044470decc6SDave Kleikamp 1045470decc6SDave Kleikamp if (!journal) 1046470decc6SDave Kleikamp return NULL; 1047470decc6SDave Kleikamp 1048470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1049470decc6SDave Kleikamp journal->j_blocksize = blocksize; 10504b905671SJan Kara jbd2_stats_proc_init(journal); 1051470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1052470decc6SDave Kleikamp journal->j_wbufsize = n; 1053470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1054470decc6SDave Kleikamp if (!journal->j_wbuf) { 1055470decc6SDave Kleikamp printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n", 1056329d291fSHarvey Harrison __func__); 10574b905671SJan Kara goto out_err; 1058470decc6SDave Kleikamp } 1059470decc6SDave Kleikamp journal->j_dev = bdev; 1060470decc6SDave Kleikamp journal->j_fs_dev = fs_dev; 1061470decc6SDave Kleikamp journal->j_blk_offset = start; 1062470decc6SDave Kleikamp journal->j_maxlen = len; 106305496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 106405496769STheodore Ts'o p = journal->j_devname; 106505496769STheodore Ts'o while ((p = strchr(p, '/'))) 106605496769STheodore Ts'o *p = '!'; 1067470decc6SDave Kleikamp 1068470decc6SDave Kleikamp bh = __getblk(journal->j_dev, start, journal->j_blocksize); 10694b905671SJan Kara if (!bh) { 10704b905671SJan Kara printk(KERN_ERR 10714b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 10724b905671SJan Kara __func__); 10734b905671SJan Kara goto out_err; 10744b905671SJan Kara } 1075470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1076470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 10774b905671SJan Kara 1078470decc6SDave Kleikamp return journal; 10794b905671SJan Kara out_err: 10804b905671SJan Kara jbd2_stats_proc_exit(journal); 10814b905671SJan Kara kfree(journal); 10824b905671SJan Kara return NULL; 1083470decc6SDave Kleikamp } 1084470decc6SDave Kleikamp 1085470decc6SDave Kleikamp /** 1086f7f4bccbSMingming Cao * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. 1087470decc6SDave Kleikamp * @inode: An inode to create the journal in 1088470decc6SDave Kleikamp * 1089f7f4bccbSMingming Cao * jbd2_journal_init_inode creates a journal which maps an on-disk inode as 1090470decc6SDave Kleikamp * the journal. The inode must exist already, must support bmap() and 1091470decc6SDave Kleikamp * must have all data blocks preallocated. 1092470decc6SDave Kleikamp */ 1093f7f4bccbSMingming Cao journal_t * jbd2_journal_init_inode (struct inode *inode) 1094470decc6SDave Kleikamp { 1095470decc6SDave Kleikamp struct buffer_head *bh; 1096470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 109705496769STheodore Ts'o char *p; 1098470decc6SDave Kleikamp int err; 1099470decc6SDave Kleikamp int n; 110018eba7aaSMingming Cao unsigned long long blocknr; 1101470decc6SDave Kleikamp 1102470decc6SDave Kleikamp if (!journal) 1103470decc6SDave Kleikamp return NULL; 1104470decc6SDave Kleikamp 1105470decc6SDave Kleikamp journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; 1106470decc6SDave Kleikamp journal->j_inode = inode; 110705496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 110805496769STheodore Ts'o p = journal->j_devname; 110905496769STheodore Ts'o while ((p = strchr(p, '/'))) 111005496769STheodore Ts'o *p = '!'; 111105496769STheodore Ts'o p = journal->j_devname + strlen(journal->j_devname); 111205496769STheodore Ts'o sprintf(p, ":%lu", journal->j_inode->i_ino); 1113470decc6SDave Kleikamp jbd_debug(1, 1114470decc6SDave Kleikamp "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", 1115470decc6SDave Kleikamp journal, inode->i_sb->s_id, inode->i_ino, 1116470decc6SDave Kleikamp (long long) inode->i_size, 1117470decc6SDave Kleikamp inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); 1118470decc6SDave Kleikamp 1119470decc6SDave Kleikamp journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; 1120470decc6SDave Kleikamp journal->j_blocksize = inode->i_sb->s_blocksize; 11218e85fb3fSJohann Lombardi jbd2_stats_proc_init(journal); 1122470decc6SDave Kleikamp 1123470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1124470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1125470decc6SDave Kleikamp journal->j_wbufsize = n; 1126470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1127470decc6SDave Kleikamp if (!journal->j_wbuf) { 1128470decc6SDave Kleikamp printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n", 1129329d291fSHarvey Harrison __func__); 11304b905671SJan Kara goto out_err; 1131470decc6SDave Kleikamp } 1132470decc6SDave Kleikamp 1133f7f4bccbSMingming Cao err = jbd2_journal_bmap(journal, 0, &blocknr); 1134470decc6SDave Kleikamp /* If that failed, give up */ 1135470decc6SDave Kleikamp if (err) { 1136470decc6SDave Kleikamp printk(KERN_ERR "%s: Cannnot locate journal superblock\n", 1137329d291fSHarvey Harrison __func__); 11384b905671SJan Kara goto out_err; 1139470decc6SDave Kleikamp } 1140470decc6SDave Kleikamp 1141470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 11424b905671SJan Kara if (!bh) { 11434b905671SJan Kara printk(KERN_ERR 11444b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 11454b905671SJan Kara __func__); 11464b905671SJan Kara goto out_err; 11474b905671SJan Kara } 1148470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1149470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 1150470decc6SDave Kleikamp 1151470decc6SDave Kleikamp return journal; 11524b905671SJan Kara out_err: 11534b905671SJan Kara jbd2_stats_proc_exit(journal); 11544b905671SJan Kara kfree(journal); 11554b905671SJan Kara return NULL; 1156470decc6SDave Kleikamp } 1157470decc6SDave Kleikamp 1158470decc6SDave Kleikamp /* 1159470decc6SDave Kleikamp * If the journal init or create aborts, we need to mark the journal 1160470decc6SDave Kleikamp * superblock as being NULL to prevent the journal destroy from writing 1161470decc6SDave Kleikamp * back a bogus superblock. 1162470decc6SDave Kleikamp */ 1163470decc6SDave Kleikamp static void journal_fail_superblock (journal_t *journal) 1164470decc6SDave Kleikamp { 1165470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1166470decc6SDave Kleikamp brelse(bh); 1167470decc6SDave Kleikamp journal->j_sb_buffer = NULL; 1168470decc6SDave Kleikamp } 1169470decc6SDave Kleikamp 1170470decc6SDave Kleikamp /* 1171470decc6SDave Kleikamp * Given a journal_t structure, initialise the various fields for 1172470decc6SDave Kleikamp * startup of a new journaling session. We use this both when creating 1173470decc6SDave Kleikamp * a journal, and after recovering an old journal to reset it for 1174470decc6SDave Kleikamp * subsequent use. 1175470decc6SDave Kleikamp */ 1176470decc6SDave Kleikamp 1177470decc6SDave Kleikamp static int journal_reset(journal_t *journal) 1178470decc6SDave Kleikamp { 1179470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 118018eba7aaSMingming Cao unsigned long long first, last; 1181470decc6SDave Kleikamp 1182470decc6SDave Kleikamp first = be32_to_cpu(sb->s_first); 1183470decc6SDave Kleikamp last = be32_to_cpu(sb->s_maxlen); 1184470decc6SDave Kleikamp 1185470decc6SDave Kleikamp journal->j_first = first; 1186470decc6SDave Kleikamp journal->j_last = last; 1187470decc6SDave Kleikamp 1188470decc6SDave Kleikamp journal->j_head = first; 1189470decc6SDave Kleikamp journal->j_tail = first; 1190470decc6SDave Kleikamp journal->j_free = last - first; 1191470decc6SDave Kleikamp 1192470decc6SDave Kleikamp journal->j_tail_sequence = journal->j_transaction_sequence; 1193470decc6SDave Kleikamp journal->j_commit_sequence = journal->j_transaction_sequence - 1; 1194470decc6SDave Kleikamp journal->j_commit_request = journal->j_commit_sequence; 1195470decc6SDave Kleikamp 1196470decc6SDave Kleikamp journal->j_max_transaction_buffers = journal->j_maxlen / 4; 1197470decc6SDave Kleikamp 1198470decc6SDave Kleikamp /* Add the dynamic fields and write it to disk. */ 1199f7f4bccbSMingming Cao jbd2_journal_update_superblock(journal, 1); 120097f06784SPavel Emelianov return jbd2_journal_start_thread(journal); 1201470decc6SDave Kleikamp } 1202470decc6SDave Kleikamp 1203470decc6SDave Kleikamp /** 1204f7f4bccbSMingming Cao * void jbd2_journal_update_superblock() - Update journal sb on disk. 1205470decc6SDave Kleikamp * @journal: The journal to update. 1206470decc6SDave Kleikamp * @wait: Set to '0' if you don't want to wait for IO completion. 1207470decc6SDave Kleikamp * 1208470decc6SDave Kleikamp * Update a journal's dynamic superblock fields and write it to disk, 1209470decc6SDave Kleikamp * optionally waiting for the IO to complete. 1210470decc6SDave Kleikamp */ 1211f7f4bccbSMingming Cao void jbd2_journal_update_superblock(journal_t *journal, int wait) 1212470decc6SDave Kleikamp { 1213470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 1214470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1215470decc6SDave Kleikamp 1216470decc6SDave Kleikamp /* 1217470decc6SDave Kleikamp * As a special case, if the on-disk copy is already marked as needing 1218470decc6SDave Kleikamp * no recovery (s_start == 0) and there are no outstanding transactions 1219470decc6SDave Kleikamp * in the filesystem, then we can safely defer the superblock update 1220f7f4bccbSMingming Cao * until the next commit by setting JBD2_FLUSHED. This avoids 1221470decc6SDave Kleikamp * attempting a write to a potential-readonly device. 1222470decc6SDave Kleikamp */ 1223470decc6SDave Kleikamp if (sb->s_start == 0 && journal->j_tail_sequence == 1224470decc6SDave Kleikamp journal->j_transaction_sequence) { 1225470decc6SDave Kleikamp jbd_debug(1,"JBD: Skipping superblock update on recovered sb " 1226470decc6SDave Kleikamp "(start %ld, seq %d, errno %d)\n", 1227470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, 1228470decc6SDave Kleikamp journal->j_errno); 1229470decc6SDave Kleikamp goto out; 1230470decc6SDave Kleikamp } 1231470decc6SDave Kleikamp 1232914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1233914258bfSTheodore Ts'o /* 1234914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the journal 1235914258bfSTheodore Ts'o * superblock failed. This could happen because the 1236914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 1237914258bfSTheodore Ts'o * be a transient write error and maybe the block will 1238914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 1239914258bfSTheodore Ts'o * write and hope for the best. 1240914258bfSTheodore Ts'o */ 1241914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: previous I/O error detected " 1242914258bfSTheodore Ts'o "for journal superblock update for %s.\n", 1243914258bfSTheodore Ts'o journal->j_devname); 1244914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1245914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1246914258bfSTheodore Ts'o } 1247914258bfSTheodore Ts'o 1248470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1249470decc6SDave Kleikamp jbd_debug(1,"JBD: updating superblock (start %ld, seq %d, errno %d)\n", 1250470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, journal->j_errno); 1251470decc6SDave Kleikamp 1252470decc6SDave Kleikamp sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 1253470decc6SDave Kleikamp sb->s_start = cpu_to_be32(journal->j_tail); 1254470decc6SDave Kleikamp sb->s_errno = cpu_to_be32(journal->j_errno); 1255470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1256470decc6SDave Kleikamp 1257470decc6SDave Kleikamp BUFFER_TRACE(bh, "marking dirty"); 1258470decc6SDave Kleikamp mark_buffer_dirty(bh); 1259914258bfSTheodore Ts'o if (wait) { 1260470decc6SDave Kleikamp sync_dirty_buffer(bh); 1261914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1262914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: I/O error detected " 1263914258bfSTheodore Ts'o "when updating journal superblock for %s.\n", 1264914258bfSTheodore Ts'o journal->j_devname); 1265914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1266914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1267914258bfSTheodore Ts'o } 1268914258bfSTheodore Ts'o } else 1269470decc6SDave Kleikamp ll_rw_block(SWRITE, 1, &bh); 1270470decc6SDave Kleikamp 1271470decc6SDave Kleikamp out: 1272470decc6SDave Kleikamp /* If we have just flushed the log (by marking s_start==0), then 1273470decc6SDave Kleikamp * any future commit will have to be careful to update the 1274470decc6SDave Kleikamp * superblock again to re-record the true start of the log. */ 1275470decc6SDave Kleikamp 1276470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1277470decc6SDave Kleikamp if (sb->s_start) 1278f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_FLUSHED; 1279470decc6SDave Kleikamp else 1280f7f4bccbSMingming Cao journal->j_flags |= JBD2_FLUSHED; 1281470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1282470decc6SDave Kleikamp } 1283470decc6SDave Kleikamp 1284470decc6SDave Kleikamp /* 1285470decc6SDave Kleikamp * Read the superblock for a given journal, performing initial 1286470decc6SDave Kleikamp * validation of the format. 1287470decc6SDave Kleikamp */ 1288470decc6SDave Kleikamp 1289470decc6SDave Kleikamp static int journal_get_superblock(journal_t *journal) 1290470decc6SDave Kleikamp { 1291470decc6SDave Kleikamp struct buffer_head *bh; 1292470decc6SDave Kleikamp journal_superblock_t *sb; 1293470decc6SDave Kleikamp int err = -EIO; 1294470decc6SDave Kleikamp 1295470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1296470decc6SDave Kleikamp 1297470decc6SDave Kleikamp J_ASSERT(bh != NULL); 1298470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1299470decc6SDave Kleikamp ll_rw_block(READ, 1, &bh); 1300470decc6SDave Kleikamp wait_on_buffer(bh); 1301470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1302470decc6SDave Kleikamp printk (KERN_ERR 1303470decc6SDave Kleikamp "JBD: IO error reading journal superblock\n"); 1304470decc6SDave Kleikamp goto out; 1305470decc6SDave Kleikamp } 1306470decc6SDave Kleikamp } 1307470decc6SDave Kleikamp 1308470decc6SDave Kleikamp sb = journal->j_superblock; 1309470decc6SDave Kleikamp 1310470decc6SDave Kleikamp err = -EINVAL; 1311470decc6SDave Kleikamp 1312f7f4bccbSMingming Cao if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || 1313470decc6SDave Kleikamp sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { 1314470decc6SDave Kleikamp printk(KERN_WARNING "JBD: no valid journal superblock found\n"); 1315470decc6SDave Kleikamp goto out; 1316470decc6SDave Kleikamp } 1317470decc6SDave Kleikamp 1318470decc6SDave Kleikamp switch(be32_to_cpu(sb->s_header.h_blocktype)) { 1319f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1320470decc6SDave Kleikamp journal->j_format_version = 1; 1321470decc6SDave Kleikamp break; 1322f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1323470decc6SDave Kleikamp journal->j_format_version = 2; 1324470decc6SDave Kleikamp break; 1325470decc6SDave Kleikamp default: 1326470decc6SDave Kleikamp printk(KERN_WARNING "JBD: unrecognised superblock format ID\n"); 1327470decc6SDave Kleikamp goto out; 1328470decc6SDave Kleikamp } 1329470decc6SDave Kleikamp 1330470decc6SDave Kleikamp if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) 1331470decc6SDave Kleikamp journal->j_maxlen = be32_to_cpu(sb->s_maxlen); 1332470decc6SDave Kleikamp else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { 1333470decc6SDave Kleikamp printk (KERN_WARNING "JBD: journal file too short\n"); 1334470decc6SDave Kleikamp goto out; 1335470decc6SDave Kleikamp } 1336470decc6SDave Kleikamp 1337470decc6SDave Kleikamp return 0; 1338470decc6SDave Kleikamp 1339470decc6SDave Kleikamp out: 1340470decc6SDave Kleikamp journal_fail_superblock(journal); 1341470decc6SDave Kleikamp return err; 1342470decc6SDave Kleikamp } 1343470decc6SDave Kleikamp 1344470decc6SDave Kleikamp /* 1345470decc6SDave Kleikamp * Load the on-disk journal superblock and read the key fields into the 1346470decc6SDave Kleikamp * journal_t. 1347470decc6SDave Kleikamp */ 1348470decc6SDave Kleikamp 1349470decc6SDave Kleikamp static int load_superblock(journal_t *journal) 1350470decc6SDave Kleikamp { 1351470decc6SDave Kleikamp int err; 1352470decc6SDave Kleikamp journal_superblock_t *sb; 1353470decc6SDave Kleikamp 1354470decc6SDave Kleikamp err = journal_get_superblock(journal); 1355470decc6SDave Kleikamp if (err) 1356470decc6SDave Kleikamp return err; 1357470decc6SDave Kleikamp 1358470decc6SDave Kleikamp sb = journal->j_superblock; 1359470decc6SDave Kleikamp 1360470decc6SDave Kleikamp journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); 1361470decc6SDave Kleikamp journal->j_tail = be32_to_cpu(sb->s_start); 1362470decc6SDave Kleikamp journal->j_first = be32_to_cpu(sb->s_first); 1363470decc6SDave Kleikamp journal->j_last = be32_to_cpu(sb->s_maxlen); 1364470decc6SDave Kleikamp journal->j_errno = be32_to_cpu(sb->s_errno); 1365470decc6SDave Kleikamp 1366470decc6SDave Kleikamp return 0; 1367470decc6SDave Kleikamp } 1368470decc6SDave Kleikamp 1369470decc6SDave Kleikamp 1370470decc6SDave Kleikamp /** 1371f7f4bccbSMingming Cao * int jbd2_journal_load() - Read journal from disk. 1372470decc6SDave Kleikamp * @journal: Journal to act on. 1373470decc6SDave Kleikamp * 1374470decc6SDave Kleikamp * Given a journal_t structure which tells us which disk blocks contain 1375470decc6SDave Kleikamp * a journal, read the journal from disk to initialise the in-memory 1376470decc6SDave Kleikamp * structures. 1377470decc6SDave Kleikamp */ 1378f7f4bccbSMingming Cao int jbd2_journal_load(journal_t *journal) 1379470decc6SDave Kleikamp { 1380470decc6SDave Kleikamp int err; 1381470decc6SDave Kleikamp journal_superblock_t *sb; 1382470decc6SDave Kleikamp 1383470decc6SDave Kleikamp err = load_superblock(journal); 1384470decc6SDave Kleikamp if (err) 1385470decc6SDave Kleikamp return err; 1386470decc6SDave Kleikamp 1387470decc6SDave Kleikamp sb = journal->j_superblock; 1388470decc6SDave Kleikamp /* If this is a V2 superblock, then we have to check the 1389470decc6SDave Kleikamp * features flags on it. */ 1390470decc6SDave Kleikamp 1391470decc6SDave Kleikamp if (journal->j_format_version >= 2) { 1392470decc6SDave Kleikamp if ((sb->s_feature_ro_compat & 1393f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || 1394470decc6SDave Kleikamp (sb->s_feature_incompat & 1395f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { 1396470decc6SDave Kleikamp printk (KERN_WARNING 1397470decc6SDave Kleikamp "JBD: Unrecognised features on journal\n"); 1398470decc6SDave Kleikamp return -EINVAL; 1399470decc6SDave Kleikamp } 1400470decc6SDave Kleikamp } 1401470decc6SDave Kleikamp 1402470decc6SDave Kleikamp /* Let the recovery code check whether it needs to recover any 1403470decc6SDave Kleikamp * data from the journal. */ 1404f7f4bccbSMingming Cao if (jbd2_journal_recover(journal)) 1405470decc6SDave Kleikamp goto recovery_error; 1406470decc6SDave Kleikamp 1407470decc6SDave Kleikamp /* OK, we've finished with the dynamic journal bits: 1408470decc6SDave Kleikamp * reinitialise the dynamic contents of the superblock in memory 1409470decc6SDave Kleikamp * and reset them on disk. */ 1410470decc6SDave Kleikamp if (journal_reset(journal)) 1411470decc6SDave Kleikamp goto recovery_error; 1412470decc6SDave Kleikamp 1413f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_ABORT; 1414f7f4bccbSMingming Cao journal->j_flags |= JBD2_LOADED; 1415470decc6SDave Kleikamp return 0; 1416470decc6SDave Kleikamp 1417470decc6SDave Kleikamp recovery_error: 1418470decc6SDave Kleikamp printk (KERN_WARNING "JBD: recovery failed\n"); 1419470decc6SDave Kleikamp return -EIO; 1420470decc6SDave Kleikamp } 1421470decc6SDave Kleikamp 1422470decc6SDave Kleikamp /** 1423f7f4bccbSMingming Cao * void jbd2_journal_destroy() - Release a journal_t structure. 1424470decc6SDave Kleikamp * @journal: Journal to act on. 1425470decc6SDave Kleikamp * 1426470decc6SDave Kleikamp * Release a journal_t structure once it is no longer in use by the 1427470decc6SDave Kleikamp * journaled object. 142844519fafSHidehiro Kawai * Return <0 if we couldn't clean up the journal. 1429470decc6SDave Kleikamp */ 143044519fafSHidehiro Kawai int jbd2_journal_destroy(journal_t *journal) 1431470decc6SDave Kleikamp { 143244519fafSHidehiro Kawai int err = 0; 143344519fafSHidehiro Kawai 1434470decc6SDave Kleikamp /* Wait for the commit thread to wake up and die. */ 1435470decc6SDave Kleikamp journal_kill_thread(journal); 1436470decc6SDave Kleikamp 1437470decc6SDave Kleikamp /* Force a final log commit */ 1438470decc6SDave Kleikamp if (journal->j_running_transaction) 1439f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 1440470decc6SDave Kleikamp 1441470decc6SDave Kleikamp /* Force any old transactions to disk */ 1442470decc6SDave Kleikamp 1443470decc6SDave Kleikamp /* Totally anal locking here... */ 1444470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1445470decc6SDave Kleikamp while (journal->j_checkpoint_transactions != NULL) { 1446470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 14471a0d3786STheodore Ts'o mutex_lock(&journal->j_checkpoint_mutex); 1448f7f4bccbSMingming Cao jbd2_log_do_checkpoint(journal); 14491a0d3786STheodore Ts'o mutex_unlock(&journal->j_checkpoint_mutex); 1450470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1451470decc6SDave Kleikamp } 1452470decc6SDave Kleikamp 1453470decc6SDave Kleikamp J_ASSERT(journal->j_running_transaction == NULL); 1454470decc6SDave Kleikamp J_ASSERT(journal->j_committing_transaction == NULL); 1455470decc6SDave Kleikamp J_ASSERT(journal->j_checkpoint_transactions == NULL); 1456470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 1457470decc6SDave Kleikamp 145844519fafSHidehiro Kawai if (journal->j_sb_buffer) { 145944519fafSHidehiro Kawai if (!is_journal_aborted(journal)) { 1460470decc6SDave Kleikamp /* We can now mark the journal as empty. */ 1461470decc6SDave Kleikamp journal->j_tail = 0; 146244519fafSHidehiro Kawai journal->j_tail_sequence = 146344519fafSHidehiro Kawai ++journal->j_transaction_sequence; 1464f7f4bccbSMingming Cao jbd2_journal_update_superblock(journal, 1); 146544519fafSHidehiro Kawai } else { 146644519fafSHidehiro Kawai err = -EIO; 146744519fafSHidehiro Kawai } 1468470decc6SDave Kleikamp brelse(journal->j_sb_buffer); 1469470decc6SDave Kleikamp } 1470470decc6SDave Kleikamp 14718e85fb3fSJohann Lombardi if (journal->j_proc_entry) 14728e85fb3fSJohann Lombardi jbd2_stats_proc_exit(journal); 1473470decc6SDave Kleikamp if (journal->j_inode) 1474470decc6SDave Kleikamp iput(journal->j_inode); 1475470decc6SDave Kleikamp if (journal->j_revoke) 1476f7f4bccbSMingming Cao jbd2_journal_destroy_revoke(journal); 1477470decc6SDave Kleikamp kfree(journal->j_wbuf); 1478470decc6SDave Kleikamp kfree(journal); 147944519fafSHidehiro Kawai 148044519fafSHidehiro Kawai return err; 1481470decc6SDave Kleikamp } 1482470decc6SDave Kleikamp 1483470decc6SDave Kleikamp 1484470decc6SDave Kleikamp /** 1485f7f4bccbSMingming Cao *int jbd2_journal_check_used_features () - Check if features specified are used. 1486470decc6SDave Kleikamp * @journal: Journal to check. 1487470decc6SDave Kleikamp * @compat: bitmask of compatible features 1488470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1489470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1490470decc6SDave Kleikamp * 1491470decc6SDave Kleikamp * Check whether the journal uses all of a given set of 1492470decc6SDave Kleikamp * features. Return true (non-zero) if it does. 1493470decc6SDave Kleikamp **/ 1494470decc6SDave Kleikamp 1495f7f4bccbSMingming Cao int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, 1496470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1497470decc6SDave Kleikamp { 1498470decc6SDave Kleikamp journal_superblock_t *sb; 1499470decc6SDave Kleikamp 1500470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1501470decc6SDave Kleikamp return 1; 1502470decc6SDave Kleikamp if (journal->j_format_version == 1) 1503470decc6SDave Kleikamp return 0; 1504470decc6SDave Kleikamp 1505470decc6SDave Kleikamp sb = journal->j_superblock; 1506470decc6SDave Kleikamp 1507470decc6SDave Kleikamp if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && 1508470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && 1509470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) 1510470decc6SDave Kleikamp return 1; 1511470decc6SDave Kleikamp 1512470decc6SDave Kleikamp return 0; 1513470decc6SDave Kleikamp } 1514470decc6SDave Kleikamp 1515470decc6SDave Kleikamp /** 1516f7f4bccbSMingming Cao * int jbd2_journal_check_available_features() - Check feature set in journalling layer 1517470decc6SDave Kleikamp * @journal: Journal to check. 1518470decc6SDave Kleikamp * @compat: bitmask of compatible features 1519470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1520470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1521470decc6SDave Kleikamp * 1522470decc6SDave Kleikamp * Check whether the journaling code supports the use of 1523470decc6SDave Kleikamp * all of a given set of features on this journal. Return true 1524470decc6SDave Kleikamp * (non-zero) if it can. */ 1525470decc6SDave Kleikamp 1526f7f4bccbSMingming Cao int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, 1527470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1528470decc6SDave Kleikamp { 1529470decc6SDave Kleikamp journal_superblock_t *sb; 1530470decc6SDave Kleikamp 1531470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1532470decc6SDave Kleikamp return 1; 1533470decc6SDave Kleikamp 1534470decc6SDave Kleikamp sb = journal->j_superblock; 1535470decc6SDave Kleikamp 1536470decc6SDave Kleikamp /* We can support any known requested features iff the 1537470decc6SDave Kleikamp * superblock is in version 2. Otherwise we fail to support any 1538470decc6SDave Kleikamp * extended sb features. */ 1539470decc6SDave Kleikamp 1540470decc6SDave Kleikamp if (journal->j_format_version != 2) 1541470decc6SDave Kleikamp return 0; 1542470decc6SDave Kleikamp 1543f7f4bccbSMingming Cao if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && 1544f7f4bccbSMingming Cao (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && 1545f7f4bccbSMingming Cao (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) 1546470decc6SDave Kleikamp return 1; 1547470decc6SDave Kleikamp 1548470decc6SDave Kleikamp return 0; 1549470decc6SDave Kleikamp } 1550470decc6SDave Kleikamp 1551470decc6SDave Kleikamp /** 1552f7f4bccbSMingming Cao * int jbd2_journal_set_features () - Mark a given journal feature in the superblock 1553470decc6SDave Kleikamp * @journal: Journal to act on. 1554470decc6SDave Kleikamp * @compat: bitmask of compatible features 1555470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1556470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1557470decc6SDave Kleikamp * 1558470decc6SDave Kleikamp * Mark a given journal feature as present on the 1559470decc6SDave Kleikamp * superblock. Returns true if the requested features could be set. 1560470decc6SDave Kleikamp * 1561470decc6SDave Kleikamp */ 1562470decc6SDave Kleikamp 1563f7f4bccbSMingming Cao int jbd2_journal_set_features (journal_t *journal, unsigned long compat, 1564470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1565470decc6SDave Kleikamp { 1566470decc6SDave Kleikamp journal_superblock_t *sb; 1567470decc6SDave Kleikamp 1568f7f4bccbSMingming Cao if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) 1569470decc6SDave Kleikamp return 1; 1570470decc6SDave Kleikamp 1571f7f4bccbSMingming Cao if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) 1572470decc6SDave Kleikamp return 0; 1573470decc6SDave Kleikamp 1574470decc6SDave Kleikamp jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", 1575470decc6SDave Kleikamp compat, ro, incompat); 1576470decc6SDave Kleikamp 1577470decc6SDave Kleikamp sb = journal->j_superblock; 1578470decc6SDave Kleikamp 1579470decc6SDave Kleikamp sb->s_feature_compat |= cpu_to_be32(compat); 1580470decc6SDave Kleikamp sb->s_feature_ro_compat |= cpu_to_be32(ro); 1581470decc6SDave Kleikamp sb->s_feature_incompat |= cpu_to_be32(incompat); 1582470decc6SDave Kleikamp 1583470decc6SDave Kleikamp return 1; 1584470decc6SDave Kleikamp } 1585470decc6SDave Kleikamp 1586818d276cSGirish Shilamkar /* 1587818d276cSGirish Shilamkar * jbd2_journal_clear_features () - Clear a given journal feature in the 1588818d276cSGirish Shilamkar * superblock 1589818d276cSGirish Shilamkar * @journal: Journal to act on. 1590818d276cSGirish Shilamkar * @compat: bitmask of compatible features 1591818d276cSGirish Shilamkar * @ro: bitmask of features that force read-only mount 1592818d276cSGirish Shilamkar * @incompat: bitmask of incompatible features 1593818d276cSGirish Shilamkar * 1594818d276cSGirish Shilamkar * Clear a given journal feature as present on the 1595818d276cSGirish Shilamkar * superblock. 1596818d276cSGirish Shilamkar */ 1597818d276cSGirish Shilamkar void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, 1598818d276cSGirish Shilamkar unsigned long ro, unsigned long incompat) 1599818d276cSGirish Shilamkar { 1600818d276cSGirish Shilamkar journal_superblock_t *sb; 1601818d276cSGirish Shilamkar 1602818d276cSGirish Shilamkar jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", 1603818d276cSGirish Shilamkar compat, ro, incompat); 1604818d276cSGirish Shilamkar 1605818d276cSGirish Shilamkar sb = journal->j_superblock; 1606818d276cSGirish Shilamkar 1607818d276cSGirish Shilamkar sb->s_feature_compat &= ~cpu_to_be32(compat); 1608818d276cSGirish Shilamkar sb->s_feature_ro_compat &= ~cpu_to_be32(ro); 1609818d276cSGirish Shilamkar sb->s_feature_incompat &= ~cpu_to_be32(incompat); 1610818d276cSGirish Shilamkar } 1611818d276cSGirish Shilamkar EXPORT_SYMBOL(jbd2_journal_clear_features); 1612470decc6SDave Kleikamp 1613470decc6SDave Kleikamp /** 1614f7f4bccbSMingming Cao * int jbd2_journal_update_format () - Update on-disk journal structure. 1615470decc6SDave Kleikamp * @journal: Journal to act on. 1616470decc6SDave Kleikamp * 1617470decc6SDave Kleikamp * Given an initialised but unloaded journal struct, poke about in the 1618470decc6SDave Kleikamp * on-disk structure to update it to the most recent supported version. 1619470decc6SDave Kleikamp */ 1620f7f4bccbSMingming Cao int jbd2_journal_update_format (journal_t *journal) 1621470decc6SDave Kleikamp { 1622470decc6SDave Kleikamp journal_superblock_t *sb; 1623470decc6SDave Kleikamp int err; 1624470decc6SDave Kleikamp 1625470decc6SDave Kleikamp err = journal_get_superblock(journal); 1626470decc6SDave Kleikamp if (err) 1627470decc6SDave Kleikamp return err; 1628470decc6SDave Kleikamp 1629470decc6SDave Kleikamp sb = journal->j_superblock; 1630470decc6SDave Kleikamp 1631470decc6SDave Kleikamp switch (be32_to_cpu(sb->s_header.h_blocktype)) { 1632f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1633470decc6SDave Kleikamp return 0; 1634f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1635470decc6SDave Kleikamp return journal_convert_superblock_v1(journal, sb); 1636470decc6SDave Kleikamp default: 1637470decc6SDave Kleikamp break; 1638470decc6SDave Kleikamp } 1639470decc6SDave Kleikamp return -EINVAL; 1640470decc6SDave Kleikamp } 1641470decc6SDave Kleikamp 1642470decc6SDave Kleikamp static int journal_convert_superblock_v1(journal_t *journal, 1643470decc6SDave Kleikamp journal_superblock_t *sb) 1644470decc6SDave Kleikamp { 1645470decc6SDave Kleikamp int offset, blocksize; 1646470decc6SDave Kleikamp struct buffer_head *bh; 1647470decc6SDave Kleikamp 1648470decc6SDave Kleikamp printk(KERN_WARNING 1649470decc6SDave Kleikamp "JBD: Converting superblock from version 1 to 2.\n"); 1650470decc6SDave Kleikamp 1651470decc6SDave Kleikamp /* Pre-initialise new fields to zero */ 1652470decc6SDave Kleikamp offset = ((char *) &(sb->s_feature_compat)) - ((char *) sb); 1653470decc6SDave Kleikamp blocksize = be32_to_cpu(sb->s_blocksize); 1654470decc6SDave Kleikamp memset(&sb->s_feature_compat, 0, blocksize-offset); 1655470decc6SDave Kleikamp 1656470decc6SDave Kleikamp sb->s_nr_users = cpu_to_be32(1); 1657f7f4bccbSMingming Cao sb->s_header.h_blocktype = cpu_to_be32(JBD2_SUPERBLOCK_V2); 1658470decc6SDave Kleikamp journal->j_format_version = 2; 1659470decc6SDave Kleikamp 1660470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1661470decc6SDave Kleikamp BUFFER_TRACE(bh, "marking dirty"); 1662470decc6SDave Kleikamp mark_buffer_dirty(bh); 1663470decc6SDave Kleikamp sync_dirty_buffer(bh); 1664470decc6SDave Kleikamp return 0; 1665470decc6SDave Kleikamp } 1666470decc6SDave Kleikamp 1667470decc6SDave Kleikamp 1668470decc6SDave Kleikamp /** 1669f7f4bccbSMingming Cao * int jbd2_journal_flush () - Flush journal 1670470decc6SDave Kleikamp * @journal: Journal to act on. 1671470decc6SDave Kleikamp * 1672470decc6SDave Kleikamp * Flush all data for a given journal to disk and empty the journal. 1673470decc6SDave Kleikamp * Filesystems can use this when remounting readonly to ensure that 1674470decc6SDave Kleikamp * recovery does not need to happen on remount. 1675470decc6SDave Kleikamp */ 1676470decc6SDave Kleikamp 1677f7f4bccbSMingming Cao int jbd2_journal_flush(journal_t *journal) 1678470decc6SDave Kleikamp { 1679470decc6SDave Kleikamp int err = 0; 1680470decc6SDave Kleikamp transaction_t *transaction = NULL; 1681470decc6SDave Kleikamp unsigned long old_tail; 1682470decc6SDave Kleikamp 1683470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1684470decc6SDave Kleikamp 1685470decc6SDave Kleikamp /* Force everything buffered to the log... */ 1686470decc6SDave Kleikamp if (journal->j_running_transaction) { 1687470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1688f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1689470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 1690470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 1691470decc6SDave Kleikamp 1692470decc6SDave Kleikamp /* Wait for the log commit to complete... */ 1693470decc6SDave Kleikamp if (transaction) { 1694470decc6SDave Kleikamp tid_t tid = transaction->t_tid; 1695470decc6SDave Kleikamp 1696470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1697f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 1698470decc6SDave Kleikamp } else { 1699470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1700470decc6SDave Kleikamp } 1701470decc6SDave Kleikamp 1702470decc6SDave Kleikamp /* ...and flush everything in the log out to disk. */ 1703470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1704470decc6SDave Kleikamp while (!err && journal->j_checkpoint_transactions != NULL) { 1705470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 170644519fafSHidehiro Kawai mutex_lock(&journal->j_checkpoint_mutex); 1707f7f4bccbSMingming Cao err = jbd2_log_do_checkpoint(journal); 170844519fafSHidehiro Kawai mutex_unlock(&journal->j_checkpoint_mutex); 1709470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1710470decc6SDave Kleikamp } 1711470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 171244519fafSHidehiro Kawai 171344519fafSHidehiro Kawai if (is_journal_aborted(journal)) 171444519fafSHidehiro Kawai return -EIO; 171544519fafSHidehiro Kawai 1716f7f4bccbSMingming Cao jbd2_cleanup_journal_tail(journal); 1717470decc6SDave Kleikamp 1718470decc6SDave Kleikamp /* Finally, mark the journal as really needing no recovery. 1719470decc6SDave Kleikamp * This sets s_start==0 in the underlying superblock, which is 1720470decc6SDave Kleikamp * the magic code for a fully-recovered superblock. Any future 1721470decc6SDave Kleikamp * commits of data to the journal will restore the current 1722470decc6SDave Kleikamp * s_start value. */ 1723470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1724470decc6SDave Kleikamp old_tail = journal->j_tail; 1725470decc6SDave Kleikamp journal->j_tail = 0; 1726470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1727f7f4bccbSMingming Cao jbd2_journal_update_superblock(journal, 1); 1728470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1729470decc6SDave Kleikamp journal->j_tail = old_tail; 1730470decc6SDave Kleikamp 1731470decc6SDave Kleikamp J_ASSERT(!journal->j_running_transaction); 1732470decc6SDave Kleikamp J_ASSERT(!journal->j_committing_transaction); 1733470decc6SDave Kleikamp J_ASSERT(!journal->j_checkpoint_transactions); 1734470decc6SDave Kleikamp J_ASSERT(journal->j_head == journal->j_tail); 1735470decc6SDave Kleikamp J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); 1736470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 173744519fafSHidehiro Kawai return 0; 1738470decc6SDave Kleikamp } 1739470decc6SDave Kleikamp 1740470decc6SDave Kleikamp /** 1741f7f4bccbSMingming Cao * int jbd2_journal_wipe() - Wipe journal contents 1742470decc6SDave Kleikamp * @journal: Journal to act on. 1743470decc6SDave Kleikamp * @write: flag (see below) 1744470decc6SDave Kleikamp * 1745470decc6SDave Kleikamp * Wipe out all of the contents of a journal, safely. This will produce 1746470decc6SDave Kleikamp * a warning if the journal contains any valid recovery information. 1747f7f4bccbSMingming Cao * Must be called between journal_init_*() and jbd2_journal_load(). 1748470decc6SDave Kleikamp * 1749470decc6SDave Kleikamp * If 'write' is non-zero, then we wipe out the journal on disk; otherwise 1750470decc6SDave Kleikamp * we merely suppress recovery. 1751470decc6SDave Kleikamp */ 1752470decc6SDave Kleikamp 1753f7f4bccbSMingming Cao int jbd2_journal_wipe(journal_t *journal, int write) 1754470decc6SDave Kleikamp { 1755470decc6SDave Kleikamp journal_superblock_t *sb; 1756470decc6SDave Kleikamp int err = 0; 1757470decc6SDave Kleikamp 1758f7f4bccbSMingming Cao J_ASSERT (!(journal->j_flags & JBD2_LOADED)); 1759470decc6SDave Kleikamp 1760470decc6SDave Kleikamp err = load_superblock(journal); 1761470decc6SDave Kleikamp if (err) 1762470decc6SDave Kleikamp return err; 1763470decc6SDave Kleikamp 1764470decc6SDave Kleikamp sb = journal->j_superblock; 1765470decc6SDave Kleikamp 1766470decc6SDave Kleikamp if (!journal->j_tail) 1767470decc6SDave Kleikamp goto no_recovery; 1768470decc6SDave Kleikamp 1769470decc6SDave Kleikamp printk (KERN_WARNING "JBD: %s recovery information on journal\n", 1770470decc6SDave Kleikamp write ? "Clearing" : "Ignoring"); 1771470decc6SDave Kleikamp 1772f7f4bccbSMingming Cao err = jbd2_journal_skip_recovery(journal); 1773470decc6SDave Kleikamp if (write) 1774f7f4bccbSMingming Cao jbd2_journal_update_superblock(journal, 1); 1775470decc6SDave Kleikamp 1776470decc6SDave Kleikamp no_recovery: 1777470decc6SDave Kleikamp return err; 1778470decc6SDave Kleikamp } 1779470decc6SDave Kleikamp 1780470decc6SDave Kleikamp /* 1781470decc6SDave Kleikamp * Journal abort has very specific semantics, which we describe 1782470decc6SDave Kleikamp * for journal abort. 1783470decc6SDave Kleikamp * 1784470decc6SDave Kleikamp * Two internal function, which provide abort to te jbd layer 1785470decc6SDave Kleikamp * itself are here. 1786470decc6SDave Kleikamp */ 1787470decc6SDave Kleikamp 1788470decc6SDave Kleikamp /* 1789470decc6SDave Kleikamp * Quick version for internal journal use (doesn't lock the journal). 1790470decc6SDave Kleikamp * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, 1791470decc6SDave Kleikamp * and don't attempt to make any other journal updates. 1792470decc6SDave Kleikamp */ 1793f7f4bccbSMingming Cao void __jbd2_journal_abort_hard(journal_t *journal) 1794470decc6SDave Kleikamp { 1795470decc6SDave Kleikamp transaction_t *transaction; 1796470decc6SDave Kleikamp 1797f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1798470decc6SDave Kleikamp return; 1799470decc6SDave Kleikamp 1800470decc6SDave Kleikamp printk(KERN_ERR "Aborting journal on device %s.\n", 180105496769STheodore Ts'o journal->j_devname); 1802470decc6SDave Kleikamp 1803470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1804f7f4bccbSMingming Cao journal->j_flags |= JBD2_ABORT; 1805470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1806470decc6SDave Kleikamp if (transaction) 1807f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1808470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1809470decc6SDave Kleikamp } 1810470decc6SDave Kleikamp 1811470decc6SDave Kleikamp /* Soft abort: record the abort error status in the journal superblock, 1812470decc6SDave Kleikamp * but don't do any other IO. */ 1813470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno) 1814470decc6SDave Kleikamp { 1815f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1816470decc6SDave Kleikamp return; 1817470decc6SDave Kleikamp 1818470decc6SDave Kleikamp if (!journal->j_errno) 1819470decc6SDave Kleikamp journal->j_errno = errno; 1820470decc6SDave Kleikamp 1821f7f4bccbSMingming Cao __jbd2_journal_abort_hard(journal); 1822470decc6SDave Kleikamp 1823470decc6SDave Kleikamp if (errno) 1824f7f4bccbSMingming Cao jbd2_journal_update_superblock(journal, 1); 1825470decc6SDave Kleikamp } 1826470decc6SDave Kleikamp 1827470decc6SDave Kleikamp /** 1828f7f4bccbSMingming Cao * void jbd2_journal_abort () - Shutdown the journal immediately. 1829470decc6SDave Kleikamp * @journal: the journal to shutdown. 1830470decc6SDave Kleikamp * @errno: an error number to record in the journal indicating 1831470decc6SDave Kleikamp * the reason for the shutdown. 1832470decc6SDave Kleikamp * 1833470decc6SDave Kleikamp * Perform a complete, immediate shutdown of the ENTIRE 1834470decc6SDave Kleikamp * journal (not of a single transaction). This operation cannot be 1835470decc6SDave Kleikamp * undone without closing and reopening the journal. 1836470decc6SDave Kleikamp * 1837f7f4bccbSMingming Cao * The jbd2_journal_abort function is intended to support higher level error 1838470decc6SDave Kleikamp * recovery mechanisms such as the ext2/ext3 remount-readonly error 1839470decc6SDave Kleikamp * mode. 1840470decc6SDave Kleikamp * 1841470decc6SDave Kleikamp * Journal abort has very specific semantics. Any existing dirty, 1842470decc6SDave Kleikamp * unjournaled buffers in the main filesystem will still be written to 1843470decc6SDave Kleikamp * disk by bdflush, but the journaling mechanism will be suspended 1844470decc6SDave Kleikamp * immediately and no further transaction commits will be honoured. 1845470decc6SDave Kleikamp * 1846470decc6SDave Kleikamp * Any dirty, journaled buffers will be written back to disk without 1847470decc6SDave Kleikamp * hitting the journal. Atomicity cannot be guaranteed on an aborted 1848470decc6SDave Kleikamp * filesystem, but we _do_ attempt to leave as much data as possible 1849470decc6SDave Kleikamp * behind for fsck to use for cleanup. 1850470decc6SDave Kleikamp * 1851470decc6SDave Kleikamp * Any attempt to get a new transaction handle on a journal which is in 1852470decc6SDave Kleikamp * ABORT state will just result in an -EROFS error return. A 1853f7f4bccbSMingming Cao * jbd2_journal_stop on an existing handle will return -EIO if we have 1854470decc6SDave Kleikamp * entered abort state during the update. 1855470decc6SDave Kleikamp * 1856470decc6SDave Kleikamp * Recursive transactions are not disturbed by journal abort until the 1857f7f4bccbSMingming Cao * final jbd2_journal_stop, which will receive the -EIO error. 1858470decc6SDave Kleikamp * 1859f7f4bccbSMingming Cao * Finally, the jbd2_journal_abort call allows the caller to supply an errno 1860470decc6SDave Kleikamp * which will be recorded (if possible) in the journal superblock. This 1861470decc6SDave Kleikamp * allows a client to record failure conditions in the middle of a 1862470decc6SDave Kleikamp * transaction without having to complete the transaction to record the 1863470decc6SDave Kleikamp * failure to disk. ext3_error, for example, now uses this 1864470decc6SDave Kleikamp * functionality. 1865470decc6SDave Kleikamp * 1866470decc6SDave Kleikamp * Errors which originate from within the journaling layer will NOT 1867470decc6SDave Kleikamp * supply an errno; a null errno implies that absolutely no further 1868470decc6SDave Kleikamp * writes are done to the journal (unless there are any already in 1869470decc6SDave Kleikamp * progress). 1870470decc6SDave Kleikamp * 1871470decc6SDave Kleikamp */ 1872470decc6SDave Kleikamp 1873f7f4bccbSMingming Cao void jbd2_journal_abort(journal_t *journal, int errno) 1874470decc6SDave Kleikamp { 1875470decc6SDave Kleikamp __journal_abort_soft(journal, errno); 1876470decc6SDave Kleikamp } 1877470decc6SDave Kleikamp 1878470decc6SDave Kleikamp /** 1879f7f4bccbSMingming Cao * int jbd2_journal_errno () - returns the journal's error state. 1880470decc6SDave Kleikamp * @journal: journal to examine. 1881470decc6SDave Kleikamp * 1882f7f4bccbSMingming Cao * This is the errno numbet set with jbd2_journal_abort(), the last 1883470decc6SDave Kleikamp * time the journal was mounted - if the journal was stopped 1884470decc6SDave Kleikamp * without calling abort this will be 0. 1885470decc6SDave Kleikamp * 1886470decc6SDave Kleikamp * If the journal has been aborted on this mount time -EROFS will 1887470decc6SDave Kleikamp * be returned. 1888470decc6SDave Kleikamp */ 1889f7f4bccbSMingming Cao int jbd2_journal_errno(journal_t *journal) 1890470decc6SDave Kleikamp { 1891470decc6SDave Kleikamp int err; 1892470decc6SDave Kleikamp 1893470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1894f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1895470decc6SDave Kleikamp err = -EROFS; 1896470decc6SDave Kleikamp else 1897470decc6SDave Kleikamp err = journal->j_errno; 1898470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1899470decc6SDave Kleikamp return err; 1900470decc6SDave Kleikamp } 1901470decc6SDave Kleikamp 1902470decc6SDave Kleikamp /** 1903f7f4bccbSMingming Cao * int jbd2_journal_clear_err () - clears the journal's error state 1904470decc6SDave Kleikamp * @journal: journal to act on. 1905470decc6SDave Kleikamp * 1906470decc6SDave Kleikamp * An error must be cleared or Acked to take a FS out of readonly 1907470decc6SDave Kleikamp * mode. 1908470decc6SDave Kleikamp */ 1909f7f4bccbSMingming Cao int jbd2_journal_clear_err(journal_t *journal) 1910470decc6SDave Kleikamp { 1911470decc6SDave Kleikamp int err = 0; 1912470decc6SDave Kleikamp 1913470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1914f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1915470decc6SDave Kleikamp err = -EROFS; 1916470decc6SDave Kleikamp else 1917470decc6SDave Kleikamp journal->j_errno = 0; 1918470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1919470decc6SDave Kleikamp return err; 1920470decc6SDave Kleikamp } 1921470decc6SDave Kleikamp 1922470decc6SDave Kleikamp /** 1923f7f4bccbSMingming Cao * void jbd2_journal_ack_err() - Ack journal err. 1924470decc6SDave Kleikamp * @journal: journal to act on. 1925470decc6SDave Kleikamp * 1926470decc6SDave Kleikamp * An error must be cleared or Acked to take a FS out of readonly 1927470decc6SDave Kleikamp * mode. 1928470decc6SDave Kleikamp */ 1929f7f4bccbSMingming Cao void jbd2_journal_ack_err(journal_t *journal) 1930470decc6SDave Kleikamp { 1931470decc6SDave Kleikamp spin_lock(&journal->j_state_lock); 1932470decc6SDave Kleikamp if (journal->j_errno) 1933f7f4bccbSMingming Cao journal->j_flags |= JBD2_ACK_ERR; 1934470decc6SDave Kleikamp spin_unlock(&journal->j_state_lock); 1935470decc6SDave Kleikamp } 1936470decc6SDave Kleikamp 1937f7f4bccbSMingming Cao int jbd2_journal_blocks_per_page(struct inode *inode) 1938470decc6SDave Kleikamp { 1939470decc6SDave Kleikamp return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 1940470decc6SDave Kleikamp } 1941470decc6SDave Kleikamp 1942470decc6SDave Kleikamp /* 1943b517bea1SZach Brown * helper functions to deal with 32 or 64bit block numbers. 1944b517bea1SZach Brown */ 1945b517bea1SZach Brown size_t journal_tag_bytes(journal_t *journal) 1946b517bea1SZach Brown { 1947b517bea1SZach Brown if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) 1948cd02ff0bSMingming Cao return JBD2_TAG_SIZE64; 1949b517bea1SZach Brown else 1950cd02ff0bSMingming Cao return JBD2_TAG_SIZE32; 1951b517bea1SZach Brown } 1952b517bea1SZach Brown 1953b517bea1SZach Brown /* 1954470decc6SDave Kleikamp * Journal_head storage management 1955470decc6SDave Kleikamp */ 1956e18b890bSChristoph Lameter static struct kmem_cache *jbd2_journal_head_cache; 1957e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 1958470decc6SDave Kleikamp static atomic_t nr_journal_heads = ATOMIC_INIT(0); 1959470decc6SDave Kleikamp #endif 1960470decc6SDave Kleikamp 1961f7f4bccbSMingming Cao static int journal_init_jbd2_journal_head_cache(void) 1962470decc6SDave Kleikamp { 1963470decc6SDave Kleikamp int retval; 1964470decc6SDave Kleikamp 19651076d17aSAl Viro J_ASSERT(jbd2_journal_head_cache == NULL); 1966a920e941SJohann Lombardi jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", 1967470decc6SDave Kleikamp sizeof(struct journal_head), 1968470decc6SDave Kleikamp 0, /* offset */ 196977160957SMingming Cao SLAB_TEMPORARY, /* flags */ 197020c2df83SPaul Mundt NULL); /* ctor */ 1971470decc6SDave Kleikamp retval = 0; 19721076d17aSAl Viro if (!jbd2_journal_head_cache) { 1973470decc6SDave Kleikamp retval = -ENOMEM; 1974470decc6SDave Kleikamp printk(KERN_EMERG "JBD: no memory for journal_head cache\n"); 1975470decc6SDave Kleikamp } 1976470decc6SDave Kleikamp return retval; 1977470decc6SDave Kleikamp } 1978470decc6SDave Kleikamp 1979f7f4bccbSMingming Cao static void jbd2_journal_destroy_jbd2_journal_head_cache(void) 1980470decc6SDave Kleikamp { 19818a9362ebSDuane Griffin if (jbd2_journal_head_cache) { 1982f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_journal_head_cache); 1983f7f4bccbSMingming Cao jbd2_journal_head_cache = NULL; 1984470decc6SDave Kleikamp } 19858a9362ebSDuane Griffin } 1986470decc6SDave Kleikamp 1987470decc6SDave Kleikamp /* 1988470decc6SDave Kleikamp * journal_head splicing and dicing 1989470decc6SDave Kleikamp */ 1990470decc6SDave Kleikamp static struct journal_head *journal_alloc_journal_head(void) 1991470decc6SDave Kleikamp { 1992470decc6SDave Kleikamp struct journal_head *ret; 1993470decc6SDave Kleikamp static unsigned long last_warning; 1994470decc6SDave Kleikamp 1995e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 1996470decc6SDave Kleikamp atomic_inc(&nr_journal_heads); 1997470decc6SDave Kleikamp #endif 1998f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 19991076d17aSAl Viro if (!ret) { 2000470decc6SDave Kleikamp jbd_debug(1, "out of memory for journal_head\n"); 2001470decc6SDave Kleikamp if (time_after(jiffies, last_warning + 5*HZ)) { 2002470decc6SDave Kleikamp printk(KERN_NOTICE "ENOMEM in %s, retrying.\n", 2003329d291fSHarvey Harrison __func__); 2004470decc6SDave Kleikamp last_warning = jiffies; 2005470decc6SDave Kleikamp } 20061076d17aSAl Viro while (!ret) { 2007470decc6SDave Kleikamp yield(); 2008f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 2009470decc6SDave Kleikamp } 2010470decc6SDave Kleikamp } 2011470decc6SDave Kleikamp return ret; 2012470decc6SDave Kleikamp } 2013470decc6SDave Kleikamp 2014470decc6SDave Kleikamp static void journal_free_journal_head(struct journal_head *jh) 2015470decc6SDave Kleikamp { 2016e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2017470decc6SDave Kleikamp atomic_dec(&nr_journal_heads); 2018cd02ff0bSMingming Cao memset(jh, JBD2_POISON_FREE, sizeof(*jh)); 2019470decc6SDave Kleikamp #endif 2020f7f4bccbSMingming Cao kmem_cache_free(jbd2_journal_head_cache, jh); 2021470decc6SDave Kleikamp } 2022470decc6SDave Kleikamp 2023470decc6SDave Kleikamp /* 2024470decc6SDave Kleikamp * A journal_head is attached to a buffer_head whenever JBD has an 2025470decc6SDave Kleikamp * interest in the buffer. 2026470decc6SDave Kleikamp * 2027470decc6SDave Kleikamp * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit 2028470decc6SDave Kleikamp * is set. This bit is tested in core kernel code where we need to take 2029470decc6SDave Kleikamp * JBD-specific actions. Testing the zeroness of ->b_private is not reliable 2030470decc6SDave Kleikamp * there. 2031470decc6SDave Kleikamp * 2032470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. 2033470decc6SDave Kleikamp * 2034470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set it is immune from being released by 2035470decc6SDave Kleikamp * core kernel code, mainly via ->b_count. 2036470decc6SDave Kleikamp * 2037470decc6SDave Kleikamp * A journal_head may be detached from its buffer_head when the journal_head's 2038470decc6SDave Kleikamp * b_transaction, b_cp_transaction and b_next_transaction pointers are NULL. 2039f7f4bccbSMingming Cao * Various places in JBD call jbd2_journal_remove_journal_head() to indicate that the 2040470decc6SDave Kleikamp * journal_head can be dropped if needed. 2041470decc6SDave Kleikamp * 2042470decc6SDave Kleikamp * Various places in the kernel want to attach a journal_head to a buffer_head 2043470decc6SDave Kleikamp * _before_ attaching the journal_head to a transaction. To protect the 2044f7f4bccbSMingming Cao * journal_head in this situation, jbd2_journal_add_journal_head elevates the 2045470decc6SDave Kleikamp * journal_head's b_jcount refcount by one. The caller must call 2046f7f4bccbSMingming Cao * jbd2_journal_put_journal_head() to undo this. 2047470decc6SDave Kleikamp * 2048470decc6SDave Kleikamp * So the typical usage would be: 2049470decc6SDave Kleikamp * 2050470decc6SDave Kleikamp * (Attach a journal_head if needed. Increments b_jcount) 2051f7f4bccbSMingming Cao * struct journal_head *jh = jbd2_journal_add_journal_head(bh); 2052470decc6SDave Kleikamp * ... 2053470decc6SDave Kleikamp * jh->b_transaction = xxx; 2054f7f4bccbSMingming Cao * jbd2_journal_put_journal_head(jh); 2055470decc6SDave Kleikamp * 2056470decc6SDave Kleikamp * Now, the journal_head's b_jcount is zero, but it is safe from being released 2057470decc6SDave Kleikamp * because it has a non-zero b_transaction. 2058470decc6SDave Kleikamp */ 2059470decc6SDave Kleikamp 2060470decc6SDave Kleikamp /* 2061470decc6SDave Kleikamp * Give a buffer_head a journal_head. 2062470decc6SDave Kleikamp * 2063470decc6SDave Kleikamp * Doesn't need the journal lock. 2064470decc6SDave Kleikamp * May sleep. 2065470decc6SDave Kleikamp */ 2066f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) 2067470decc6SDave Kleikamp { 2068470decc6SDave Kleikamp struct journal_head *jh; 2069470decc6SDave Kleikamp struct journal_head *new_jh = NULL; 2070470decc6SDave Kleikamp 2071470decc6SDave Kleikamp repeat: 2072470decc6SDave Kleikamp if (!buffer_jbd(bh)) { 2073470decc6SDave Kleikamp new_jh = journal_alloc_journal_head(); 2074470decc6SDave Kleikamp memset(new_jh, 0, sizeof(*new_jh)); 2075470decc6SDave Kleikamp } 2076470decc6SDave Kleikamp 2077470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2078470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2079470decc6SDave Kleikamp jh = bh2jh(bh); 2080470decc6SDave Kleikamp } else { 2081470decc6SDave Kleikamp J_ASSERT_BH(bh, 2082470decc6SDave Kleikamp (atomic_read(&bh->b_count) > 0) || 2083470decc6SDave Kleikamp (bh->b_page && bh->b_page->mapping)); 2084470decc6SDave Kleikamp 2085470decc6SDave Kleikamp if (!new_jh) { 2086470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2087470decc6SDave Kleikamp goto repeat; 2088470decc6SDave Kleikamp } 2089470decc6SDave Kleikamp 2090470decc6SDave Kleikamp jh = new_jh; 2091470decc6SDave Kleikamp new_jh = NULL; /* We consumed it */ 2092470decc6SDave Kleikamp set_buffer_jbd(bh); 2093470decc6SDave Kleikamp bh->b_private = jh; 2094470decc6SDave Kleikamp jh->b_bh = bh; 2095470decc6SDave Kleikamp get_bh(bh); 2096470decc6SDave Kleikamp BUFFER_TRACE(bh, "added journal_head"); 2097470decc6SDave Kleikamp } 2098470decc6SDave Kleikamp jh->b_jcount++; 2099470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2100470decc6SDave Kleikamp if (new_jh) 2101470decc6SDave Kleikamp journal_free_journal_head(new_jh); 2102470decc6SDave Kleikamp return bh->b_private; 2103470decc6SDave Kleikamp } 2104470decc6SDave Kleikamp 2105470decc6SDave Kleikamp /* 2106470decc6SDave Kleikamp * Grab a ref against this buffer_head's journal_head. If it ended up not 2107470decc6SDave Kleikamp * having a journal_head, return NULL 2108470decc6SDave Kleikamp */ 2109f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) 2110470decc6SDave Kleikamp { 2111470decc6SDave Kleikamp struct journal_head *jh = NULL; 2112470decc6SDave Kleikamp 2113470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2114470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2115470decc6SDave Kleikamp jh = bh2jh(bh); 2116470decc6SDave Kleikamp jh->b_jcount++; 2117470decc6SDave Kleikamp } 2118470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2119470decc6SDave Kleikamp return jh; 2120470decc6SDave Kleikamp } 2121470decc6SDave Kleikamp 2122470decc6SDave Kleikamp static void __journal_remove_journal_head(struct buffer_head *bh) 2123470decc6SDave Kleikamp { 2124470decc6SDave Kleikamp struct journal_head *jh = bh2jh(bh); 2125470decc6SDave Kleikamp 2126470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount >= 0); 2127470decc6SDave Kleikamp 2128470decc6SDave Kleikamp get_bh(bh); 2129470decc6SDave Kleikamp if (jh->b_jcount == 0) { 2130470decc6SDave Kleikamp if (jh->b_transaction == NULL && 2131470decc6SDave Kleikamp jh->b_next_transaction == NULL && 2132470decc6SDave Kleikamp jh->b_cp_transaction == NULL) { 2133470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jlist == BJ_None); 2134470decc6SDave Kleikamp J_ASSERT_BH(bh, buffer_jbd(bh)); 2135470decc6SDave Kleikamp J_ASSERT_BH(bh, jh2bh(jh) == bh); 2136470decc6SDave Kleikamp BUFFER_TRACE(bh, "remove journal_head"); 2137470decc6SDave Kleikamp if (jh->b_frozen_data) { 2138470decc6SDave Kleikamp printk(KERN_WARNING "%s: freeing " 2139470decc6SDave Kleikamp "b_frozen_data\n", 2140329d291fSHarvey Harrison __func__); 2141af1e76d6SMingming Cao jbd2_free(jh->b_frozen_data, bh->b_size); 2142470decc6SDave Kleikamp } 2143470decc6SDave Kleikamp if (jh->b_committed_data) { 2144470decc6SDave Kleikamp printk(KERN_WARNING "%s: freeing " 2145470decc6SDave Kleikamp "b_committed_data\n", 2146329d291fSHarvey Harrison __func__); 2147af1e76d6SMingming Cao jbd2_free(jh->b_committed_data, bh->b_size); 2148470decc6SDave Kleikamp } 2149470decc6SDave Kleikamp bh->b_private = NULL; 2150470decc6SDave Kleikamp jh->b_bh = NULL; /* debug, really */ 2151470decc6SDave Kleikamp clear_buffer_jbd(bh); 2152470decc6SDave Kleikamp __brelse(bh); 2153470decc6SDave Kleikamp journal_free_journal_head(jh); 2154470decc6SDave Kleikamp } else { 2155470decc6SDave Kleikamp BUFFER_TRACE(bh, "journal_head was locked"); 2156470decc6SDave Kleikamp } 2157470decc6SDave Kleikamp } 2158470decc6SDave Kleikamp } 2159470decc6SDave Kleikamp 2160470decc6SDave Kleikamp /* 2161f7f4bccbSMingming Cao * jbd2_journal_remove_journal_head(): if the buffer isn't attached to a transaction 2162470decc6SDave Kleikamp * and has a zero b_jcount then remove and release its journal_head. If we did 2163470decc6SDave Kleikamp * see that the buffer is not used by any transaction we also "logically" 2164470decc6SDave Kleikamp * decrement ->b_count. 2165470decc6SDave Kleikamp * 2166470decc6SDave Kleikamp * We in fact take an additional increment on ->b_count as a convenience, 2167470decc6SDave Kleikamp * because the caller usually wants to do additional things with the bh 2168470decc6SDave Kleikamp * after calling here. 2169f7f4bccbSMingming Cao * The caller of jbd2_journal_remove_journal_head() *must* run __brelse(bh) at some 2170470decc6SDave Kleikamp * time. Once the caller has run __brelse(), the buffer is eligible for 2171470decc6SDave Kleikamp * reaping by try_to_free_buffers(). 2172470decc6SDave Kleikamp */ 2173f7f4bccbSMingming Cao void jbd2_journal_remove_journal_head(struct buffer_head *bh) 2174470decc6SDave Kleikamp { 2175470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2176470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2177470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2178470decc6SDave Kleikamp } 2179470decc6SDave Kleikamp 2180470decc6SDave Kleikamp /* 2181470decc6SDave Kleikamp * Drop a reference on the passed journal_head. If it fell to zero then try to 2182470decc6SDave Kleikamp * release the journal_head from the buffer_head. 2183470decc6SDave Kleikamp */ 2184f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh) 2185470decc6SDave Kleikamp { 2186470decc6SDave Kleikamp struct buffer_head *bh = jh2bh(jh); 2187470decc6SDave Kleikamp 2188470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2189470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount > 0); 2190470decc6SDave Kleikamp --jh->b_jcount; 2191470decc6SDave Kleikamp if (!jh->b_jcount && !jh->b_transaction) { 2192470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2193470decc6SDave Kleikamp __brelse(bh); 2194470decc6SDave Kleikamp } 2195470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2196470decc6SDave Kleikamp } 2197470decc6SDave Kleikamp 2198470decc6SDave Kleikamp /* 2199c851ed54SJan Kara * Initialize jbd inode head 2200c851ed54SJan Kara */ 2201c851ed54SJan Kara void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) 2202c851ed54SJan Kara { 2203c851ed54SJan Kara jinode->i_transaction = NULL; 2204c851ed54SJan Kara jinode->i_next_transaction = NULL; 2205c851ed54SJan Kara jinode->i_vfs_inode = inode; 2206c851ed54SJan Kara jinode->i_flags = 0; 2207c851ed54SJan Kara INIT_LIST_HEAD(&jinode->i_list); 2208c851ed54SJan Kara } 2209c851ed54SJan Kara 2210c851ed54SJan Kara /* 2211c851ed54SJan Kara * Function to be called before we start removing inode from memory (i.e., 2212c851ed54SJan Kara * clear_inode() is a fine place to be called from). It removes inode from 2213c851ed54SJan Kara * transaction's lists. 2214c851ed54SJan Kara */ 2215c851ed54SJan Kara void jbd2_journal_release_jbd_inode(journal_t *journal, 2216c851ed54SJan Kara struct jbd2_inode *jinode) 2217c851ed54SJan Kara { 2218c851ed54SJan Kara int writeout = 0; 2219c851ed54SJan Kara 2220c851ed54SJan Kara if (!journal) 2221c851ed54SJan Kara return; 2222c851ed54SJan Kara restart: 2223c851ed54SJan Kara spin_lock(&journal->j_list_lock); 2224c851ed54SJan Kara /* Is commit writing out inode - we have to wait */ 2225c851ed54SJan Kara if (jinode->i_flags & JI_COMMIT_RUNNING) { 2226c851ed54SJan Kara wait_queue_head_t *wq; 2227c851ed54SJan Kara DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); 2228c851ed54SJan Kara wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); 2229c851ed54SJan Kara prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); 2230c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2231c851ed54SJan Kara schedule(); 2232c851ed54SJan Kara finish_wait(wq, &wait.wait); 2233c851ed54SJan Kara goto restart; 2234c851ed54SJan Kara } 2235c851ed54SJan Kara 2236c851ed54SJan Kara /* Do we need to wait for data writeback? */ 2237c851ed54SJan Kara if (journal->j_committing_transaction == jinode->i_transaction) 2238c851ed54SJan Kara writeout = 1; 2239c851ed54SJan Kara if (jinode->i_transaction) { 2240c851ed54SJan Kara list_del(&jinode->i_list); 2241c851ed54SJan Kara jinode->i_transaction = NULL; 2242c851ed54SJan Kara } 2243c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2244c851ed54SJan Kara } 2245c851ed54SJan Kara 2246c851ed54SJan Kara /* 22470f49d5d0SJose R. Santos * debugfs tunables 2248470decc6SDave Kleikamp */ 22496f38c74fSJose R. Santos #ifdef CONFIG_JBD2_DEBUG 22506f38c74fSJose R. Santos u8 jbd2_journal_enable_debug __read_mostly; 2251f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_enable_debug); 2252470decc6SDave Kleikamp 22530f49d5d0SJose R. Santos #define JBD2_DEBUG_NAME "jbd2-debug" 2254470decc6SDave Kleikamp 22556f38c74fSJose R. Santos static struct dentry *jbd2_debugfs_dir; 22566f38c74fSJose R. Santos static struct dentry *jbd2_debug; 22570f49d5d0SJose R. Santos 22580f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 2259470decc6SDave Kleikamp { 22600f49d5d0SJose R. Santos jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL); 22610f49d5d0SJose R. Santos if (jbd2_debugfs_dir) 22620f49d5d0SJose R. Santos jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, S_IRUGO, 22630f49d5d0SJose R. Santos jbd2_debugfs_dir, 22640f49d5d0SJose R. Santos &jbd2_journal_enable_debug); 2265470decc6SDave Kleikamp } 2266470decc6SDave Kleikamp 22670f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 2268470decc6SDave Kleikamp { 22690f49d5d0SJose R. Santos debugfs_remove(jbd2_debug); 22700f49d5d0SJose R. Santos debugfs_remove(jbd2_debugfs_dir); 2271470decc6SDave Kleikamp } 2272470decc6SDave Kleikamp 2273470decc6SDave Kleikamp #else 2274470decc6SDave Kleikamp 22750f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 22760f49d5d0SJose R. Santos { 22770f49d5d0SJose R. Santos } 22780f49d5d0SJose R. Santos 22790f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 22800f49d5d0SJose R. Santos { 22810f49d5d0SJose R. Santos } 2282470decc6SDave Kleikamp 2283470decc6SDave Kleikamp #endif 2284470decc6SDave Kleikamp 22858e85fb3fSJohann Lombardi #ifdef CONFIG_PROC_FS 22868e85fb3fSJohann Lombardi 22878e85fb3fSJohann Lombardi #define JBD2_STATS_PROC_NAME "fs/jbd2" 22888e85fb3fSJohann Lombardi 22898e85fb3fSJohann Lombardi static void __init jbd2_create_jbd_stats_proc_entry(void) 22908e85fb3fSJohann Lombardi { 22918e85fb3fSJohann Lombardi proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); 22928e85fb3fSJohann Lombardi } 22938e85fb3fSJohann Lombardi 22948e85fb3fSJohann Lombardi static void __exit jbd2_remove_jbd_stats_proc_entry(void) 22958e85fb3fSJohann Lombardi { 22968e85fb3fSJohann Lombardi if (proc_jbd2_stats) 22978e85fb3fSJohann Lombardi remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); 22988e85fb3fSJohann Lombardi } 22998e85fb3fSJohann Lombardi 23008e85fb3fSJohann Lombardi #else 23018e85fb3fSJohann Lombardi 23028e85fb3fSJohann Lombardi #define jbd2_create_jbd_stats_proc_entry() do {} while (0) 23038e85fb3fSJohann Lombardi #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) 23048e85fb3fSJohann Lombardi 23058e85fb3fSJohann Lombardi #endif 23068e85fb3fSJohann Lombardi 2307e18b890bSChristoph Lameter struct kmem_cache *jbd2_handle_cache; 2308470decc6SDave Kleikamp 2309470decc6SDave Kleikamp static int __init journal_init_handle_cache(void) 2310470decc6SDave Kleikamp { 2311a920e941SJohann Lombardi jbd2_handle_cache = kmem_cache_create("jbd2_journal_handle", 2312470decc6SDave Kleikamp sizeof(handle_t), 2313470decc6SDave Kleikamp 0, /* offset */ 231477160957SMingming Cao SLAB_TEMPORARY, /* flags */ 231520c2df83SPaul Mundt NULL); /* ctor */ 2316f7f4bccbSMingming Cao if (jbd2_handle_cache == NULL) { 2317470decc6SDave Kleikamp printk(KERN_EMERG "JBD: failed to create handle cache\n"); 2318470decc6SDave Kleikamp return -ENOMEM; 2319470decc6SDave Kleikamp } 2320470decc6SDave Kleikamp return 0; 2321470decc6SDave Kleikamp } 2322470decc6SDave Kleikamp 2323f7f4bccbSMingming Cao static void jbd2_journal_destroy_handle_cache(void) 2324470decc6SDave Kleikamp { 2325f7f4bccbSMingming Cao if (jbd2_handle_cache) 2326f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_handle_cache); 2327470decc6SDave Kleikamp } 2328470decc6SDave Kleikamp 2329470decc6SDave Kleikamp /* 2330470decc6SDave Kleikamp * Module startup and shutdown 2331470decc6SDave Kleikamp */ 2332470decc6SDave Kleikamp 2333470decc6SDave Kleikamp static int __init journal_init_caches(void) 2334470decc6SDave Kleikamp { 2335470decc6SDave Kleikamp int ret; 2336470decc6SDave Kleikamp 2337f7f4bccbSMingming Cao ret = jbd2_journal_init_revoke_caches(); 2338470decc6SDave Kleikamp if (ret == 0) 2339f7f4bccbSMingming Cao ret = journal_init_jbd2_journal_head_cache(); 2340470decc6SDave Kleikamp if (ret == 0) 2341470decc6SDave Kleikamp ret = journal_init_handle_cache(); 2342470decc6SDave Kleikamp return ret; 2343470decc6SDave Kleikamp } 2344470decc6SDave Kleikamp 2345f7f4bccbSMingming Cao static void jbd2_journal_destroy_caches(void) 2346470decc6SDave Kleikamp { 2347f7f4bccbSMingming Cao jbd2_journal_destroy_revoke_caches(); 2348f7f4bccbSMingming Cao jbd2_journal_destroy_jbd2_journal_head_cache(); 2349f7f4bccbSMingming Cao jbd2_journal_destroy_handle_cache(); 2350470decc6SDave Kleikamp } 2351470decc6SDave Kleikamp 2352470decc6SDave Kleikamp static int __init journal_init(void) 2353470decc6SDave Kleikamp { 2354470decc6SDave Kleikamp int ret; 2355470decc6SDave Kleikamp 2356470decc6SDave Kleikamp BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); 2357470decc6SDave Kleikamp 2358470decc6SDave Kleikamp ret = journal_init_caches(); 2359620de4e1SDuane Griffin if (ret == 0) { 23600f49d5d0SJose R. Santos jbd2_create_debugfs_entry(); 23618e85fb3fSJohann Lombardi jbd2_create_jbd_stats_proc_entry(); 2362620de4e1SDuane Griffin } else { 2363620de4e1SDuane Griffin jbd2_journal_destroy_caches(); 2364620de4e1SDuane Griffin } 2365470decc6SDave Kleikamp return ret; 2366470decc6SDave Kleikamp } 2367470decc6SDave Kleikamp 2368470decc6SDave Kleikamp static void __exit journal_exit(void) 2369470decc6SDave Kleikamp { 2370e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2371470decc6SDave Kleikamp int n = atomic_read(&nr_journal_heads); 2372470decc6SDave Kleikamp if (n) 2373470decc6SDave Kleikamp printk(KERN_EMERG "JBD: leaked %d journal_heads!\n", n); 2374470decc6SDave Kleikamp #endif 23750f49d5d0SJose R. Santos jbd2_remove_debugfs_entry(); 23768e85fb3fSJohann Lombardi jbd2_remove_jbd_stats_proc_entry(); 2377f7f4bccbSMingming Cao jbd2_journal_destroy_caches(); 2378470decc6SDave Kleikamp } 2379470decc6SDave Kleikamp 2380470decc6SDave Kleikamp MODULE_LICENSE("GPL"); 2381470decc6SDave Kleikamp module_init(journal_init); 2382470decc6SDave Kleikamp module_exit(journal_exit); 2383470decc6SDave Kleikamp 2384