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> 41879c5e6bSTheodore Ts'o #include <linux/hash.h> 42d2eecb03STheodore Ts'o #include <linux/log2.h> 43d2eecb03STheodore Ts'o #include <linux/vmalloc.h> 4447def826STheodore Ts'o #include <linux/backing-dev.h> 4539e3ac25SBrian King #include <linux/bitops.h> 46670be5a7STheodore Ts'o #include <linux/ratelimit.h> 47879c5e6bSTheodore Ts'o 48879c5e6bSTheodore Ts'o #define CREATE_TRACE_POINTS 49879c5e6bSTheodore Ts'o #include <trace/events/jbd2.h> 50470decc6SDave Kleikamp 51470decc6SDave Kleikamp #include <asm/uaccess.h> 52470decc6SDave Kleikamp #include <asm/page.h> 5339e3ac25SBrian King #include <asm/system.h> 54470decc6SDave Kleikamp 55f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_extend); 56f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_stop); 57f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_lock_updates); 58f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_unlock_updates); 59f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_write_access); 60f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_create_access); 61f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_undo_access); 62e06c8227SJoel Becker EXPORT_SYMBOL(jbd2_journal_set_triggers); 63f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_dirty_metadata); 64f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_release_buffer); 65f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_forget); 66470decc6SDave Kleikamp #if 0 67470decc6SDave Kleikamp EXPORT_SYMBOL(journal_sync_buffer); 68470decc6SDave Kleikamp #endif 69f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_flush); 70f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_revoke); 71470decc6SDave Kleikamp 72f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_init_dev); 73f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_init_inode); 74f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_check_used_features); 75f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_check_available_features); 76f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_set_features); 77f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_load); 78f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_destroy); 79f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_abort); 80f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_errno); 81f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_ack_err); 82f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_clear_err); 83f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_log_wait_commit); 843b799d15STheodore Ts'o EXPORT_SYMBOL(jbd2_log_start_commit); 85f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_start_commit); 86f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_force_commit_nested); 87f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_wipe); 88f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_blocks_per_page); 89f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_invalidatepage); 90f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers); 91f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_force_commit); 92c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_file_inode); 93c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); 94c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); 95c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); 968aefcd55STheodore Ts'o EXPORT_SYMBOL(jbd2_inode_cache); 97470decc6SDave Kleikamp 98470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno); 99d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t slab_size); 100470decc6SDave Kleikamp 101470decc6SDave Kleikamp /* 102470decc6SDave Kleikamp * Helper function used to manage commit timeouts 103470decc6SDave Kleikamp */ 104470decc6SDave Kleikamp 105470decc6SDave Kleikamp static void commit_timeout(unsigned long __data) 106470decc6SDave Kleikamp { 107470decc6SDave Kleikamp struct task_struct * p = (struct task_struct *) __data; 108470decc6SDave Kleikamp 109470decc6SDave Kleikamp wake_up_process(p); 110470decc6SDave Kleikamp } 111470decc6SDave Kleikamp 112470decc6SDave Kleikamp /* 113f7f4bccbSMingming Cao * kjournald2: The main thread function used to manage a logging device 114470decc6SDave Kleikamp * journal. 115470decc6SDave Kleikamp * 116470decc6SDave Kleikamp * This kernel thread is responsible for two things: 117470decc6SDave Kleikamp * 118470decc6SDave Kleikamp * 1) COMMIT: Every so often we need to commit the current state of the 119470decc6SDave Kleikamp * filesystem to disk. The journal thread is responsible for writing 120470decc6SDave Kleikamp * all of the metadata buffers to disk. 121470decc6SDave Kleikamp * 122470decc6SDave Kleikamp * 2) CHECKPOINT: We cannot reuse a used section of the log file until all 123470decc6SDave Kleikamp * of the data in that part of the log has been rewritten elsewhere on 124470decc6SDave Kleikamp * the disk. Flushing these old buffers to reclaim space in the log is 125470decc6SDave Kleikamp * known as checkpointing, and this thread is responsible for that job. 126470decc6SDave Kleikamp */ 127470decc6SDave Kleikamp 128f7f4bccbSMingming Cao static int kjournald2(void *arg) 129470decc6SDave Kleikamp { 130470decc6SDave Kleikamp journal_t *journal = arg; 131470decc6SDave Kleikamp transaction_t *transaction; 132470decc6SDave Kleikamp 133470decc6SDave Kleikamp /* 134470decc6SDave Kleikamp * Set up an interval timer which can be used to trigger a commit wakeup 135470decc6SDave Kleikamp * after the commit interval expires 136470decc6SDave Kleikamp */ 137470decc6SDave Kleikamp setup_timer(&journal->j_commit_timer, commit_timeout, 138470decc6SDave Kleikamp (unsigned long)current); 139470decc6SDave Kleikamp 140470decc6SDave Kleikamp /* Record that the journal thread is running */ 141470decc6SDave Kleikamp journal->j_task = current; 142470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 143470decc6SDave Kleikamp 144470decc6SDave Kleikamp /* 145470decc6SDave Kleikamp * And now, wait forever for commit wakeup events. 146470decc6SDave Kleikamp */ 147a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 148470decc6SDave Kleikamp 149470decc6SDave Kleikamp loop: 150f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 151470decc6SDave Kleikamp goto end_loop; 152470decc6SDave Kleikamp 153470decc6SDave Kleikamp jbd_debug(1, "commit_sequence=%d, commit_request=%d\n", 154470decc6SDave Kleikamp journal->j_commit_sequence, journal->j_commit_request); 155470decc6SDave Kleikamp 156470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) { 157470decc6SDave Kleikamp jbd_debug(1, "OK, requests differ\n"); 158a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 159470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 160f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 161a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 162470decc6SDave Kleikamp goto loop; 163470decc6SDave Kleikamp } 164470decc6SDave Kleikamp 165470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 166470decc6SDave Kleikamp if (freezing(current)) { 167470decc6SDave Kleikamp /* 168470decc6SDave Kleikamp * The simpler the better. Flushing journal isn't a 169470decc6SDave Kleikamp * good idea, because that depends on threads that may 170470decc6SDave Kleikamp * be already stopped. 171470decc6SDave Kleikamp */ 172f7f4bccbSMingming Cao jbd_debug(1, "Now suspending kjournald2\n"); 173a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 174a0acae0eSTejun Heo try_to_freeze(); 175a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 176470decc6SDave Kleikamp } else { 177470decc6SDave Kleikamp /* 178470decc6SDave Kleikamp * We assume on resume that commits are already there, 179470decc6SDave Kleikamp * so we don't sleep 180470decc6SDave Kleikamp */ 181470decc6SDave Kleikamp DEFINE_WAIT(wait); 182470decc6SDave Kleikamp int should_sleep = 1; 183470decc6SDave Kleikamp 184470decc6SDave Kleikamp prepare_to_wait(&journal->j_wait_commit, &wait, 185470decc6SDave Kleikamp TASK_INTERRUPTIBLE); 186470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) 187470decc6SDave Kleikamp should_sleep = 0; 188470decc6SDave Kleikamp transaction = journal->j_running_transaction; 189470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, 190470decc6SDave Kleikamp transaction->t_expires)) 191470decc6SDave Kleikamp should_sleep = 0; 192f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 193470decc6SDave Kleikamp should_sleep = 0; 194470decc6SDave Kleikamp if (should_sleep) { 195a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 196470decc6SDave Kleikamp schedule(); 197a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 198470decc6SDave Kleikamp } 199470decc6SDave Kleikamp finish_wait(&journal->j_wait_commit, &wait); 200470decc6SDave Kleikamp } 201470decc6SDave Kleikamp 202f7f4bccbSMingming Cao jbd_debug(1, "kjournald2 wakes\n"); 203470decc6SDave Kleikamp 204470decc6SDave Kleikamp /* 205470decc6SDave Kleikamp * Were we woken up by a commit wakeup event? 206470decc6SDave Kleikamp */ 207470decc6SDave Kleikamp transaction = journal->j_running_transaction; 208470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, transaction->t_expires)) { 209470decc6SDave Kleikamp journal->j_commit_request = transaction->t_tid; 210470decc6SDave Kleikamp jbd_debug(1, "woke because of timeout\n"); 211470decc6SDave Kleikamp } 212470decc6SDave Kleikamp goto loop; 213470decc6SDave Kleikamp 214470decc6SDave Kleikamp end_loop: 215a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 216470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 217470decc6SDave Kleikamp journal->j_task = NULL; 218470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 219470decc6SDave Kleikamp jbd_debug(1, "Journal thread exiting.\n"); 220470decc6SDave Kleikamp return 0; 221470decc6SDave Kleikamp } 222470decc6SDave Kleikamp 22397f06784SPavel Emelianov static int jbd2_journal_start_thread(journal_t *journal) 224470decc6SDave Kleikamp { 22597f06784SPavel Emelianov struct task_struct *t; 22697f06784SPavel Emelianov 22790576c0bSTheodore Ts'o t = kthread_run(kjournald2, journal, "jbd2/%s", 22890576c0bSTheodore Ts'o journal->j_devname); 22997f06784SPavel Emelianov if (IS_ERR(t)) 23097f06784SPavel Emelianov return PTR_ERR(t); 23197f06784SPavel Emelianov 2321076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task != NULL); 23397f06784SPavel Emelianov return 0; 234470decc6SDave Kleikamp } 235470decc6SDave Kleikamp 236470decc6SDave Kleikamp static void journal_kill_thread(journal_t *journal) 237470decc6SDave Kleikamp { 238a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 239f7f4bccbSMingming Cao journal->j_flags |= JBD2_UNMOUNT; 240470decc6SDave Kleikamp 241470decc6SDave Kleikamp while (journal->j_task) { 242470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 243a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2441076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task == NULL); 245a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 246470decc6SDave Kleikamp } 247a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 248470decc6SDave Kleikamp } 249470decc6SDave Kleikamp 250470decc6SDave Kleikamp /* 251f7f4bccbSMingming Cao * jbd2_journal_write_metadata_buffer: write a metadata buffer to the journal. 252470decc6SDave Kleikamp * 253470decc6SDave Kleikamp * Writes a metadata buffer to a given disk block. The actual IO is not 254470decc6SDave Kleikamp * performed but a new buffer_head is constructed which labels the data 255470decc6SDave Kleikamp * to be written with the correct destination disk block. 256470decc6SDave Kleikamp * 257470decc6SDave Kleikamp * Any magic-number escaping which needs to be done will cause a 258470decc6SDave Kleikamp * copy-out here. If the buffer happens to start with the 259f7f4bccbSMingming Cao * JBD2_MAGIC_NUMBER, then we can't write it to the log directly: the 260470decc6SDave Kleikamp * magic number is only written to the log for descripter blocks. In 261470decc6SDave Kleikamp * this case, we copy the data and replace the first word with 0, and we 262470decc6SDave Kleikamp * return a result code which indicates that this buffer needs to be 263470decc6SDave Kleikamp * marked as an escaped buffer in the corresponding log descriptor 264470decc6SDave Kleikamp * block. The missing word can then be restored when the block is read 265470decc6SDave Kleikamp * during recovery. 266470decc6SDave Kleikamp * 267470decc6SDave Kleikamp * If the source buffer has already been modified by a new transaction 268470decc6SDave Kleikamp * since we took the last commit snapshot, we use the frozen copy of 269470decc6SDave Kleikamp * that data for IO. If we end up using the existing buffer_head's data 270470decc6SDave Kleikamp * for the write, then we *have* to lock the buffer to prevent anyone 271470decc6SDave Kleikamp * else from using and possibly modifying it while the IO is in 272470decc6SDave Kleikamp * progress. 273470decc6SDave Kleikamp * 274470decc6SDave Kleikamp * The function returns a pointer to the buffer_heads to be used for IO. 275470decc6SDave Kleikamp * 276470decc6SDave Kleikamp * We assume that the journal has already been locked in this function. 277470decc6SDave Kleikamp * 278470decc6SDave Kleikamp * Return value: 279470decc6SDave Kleikamp * <0: Error 280470decc6SDave Kleikamp * >=0: Finished OK 281470decc6SDave Kleikamp * 282470decc6SDave Kleikamp * On success: 283470decc6SDave Kleikamp * Bit 0 set == escape performed on the data 284470decc6SDave Kleikamp * Bit 1 set == buffer copy-out performed (kfree the data after IO) 285470decc6SDave Kleikamp */ 286470decc6SDave Kleikamp 287f7f4bccbSMingming Cao int jbd2_journal_write_metadata_buffer(transaction_t *transaction, 288470decc6SDave Kleikamp struct journal_head *jh_in, 289470decc6SDave Kleikamp struct journal_head **jh_out, 29018eba7aaSMingming Cao unsigned long long blocknr) 291470decc6SDave Kleikamp { 292470decc6SDave Kleikamp int need_copy_out = 0; 293470decc6SDave Kleikamp int done_copy_out = 0; 294470decc6SDave Kleikamp int do_escape = 0; 295470decc6SDave Kleikamp char *mapped_data; 296470decc6SDave Kleikamp struct buffer_head *new_bh; 297470decc6SDave Kleikamp struct journal_head *new_jh; 298470decc6SDave Kleikamp struct page *new_page; 299470decc6SDave Kleikamp unsigned int new_offset; 300470decc6SDave Kleikamp struct buffer_head *bh_in = jh2bh(jh_in); 30196577c43Sdingdinghua journal_t *journal = transaction->t_journal; 302470decc6SDave Kleikamp 303470decc6SDave Kleikamp /* 304470decc6SDave Kleikamp * The buffer really shouldn't be locked: only the current committing 305470decc6SDave Kleikamp * transaction is allowed to write it, so nobody else is allowed 306470decc6SDave Kleikamp * to do any IO. 307470decc6SDave Kleikamp * 308470decc6SDave Kleikamp * akpm: except if we're journalling data, and write() output is 309470decc6SDave Kleikamp * also part of a shared mapping, and another thread has 310470decc6SDave Kleikamp * decided to launch a writepage() against this buffer. 311470decc6SDave Kleikamp */ 312470decc6SDave Kleikamp J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in)); 313470decc6SDave Kleikamp 31447def826STheodore Ts'o retry_alloc: 31547def826STheodore Ts'o new_bh = alloc_buffer_head(GFP_NOFS); 31647def826STheodore Ts'o if (!new_bh) { 31747def826STheodore Ts'o /* 31847def826STheodore Ts'o * Failure is not an option, but __GFP_NOFAIL is going 31947def826STheodore Ts'o * away; so we retry ourselves here. 32047def826STheodore Ts'o */ 32147def826STheodore Ts'o congestion_wait(BLK_RW_ASYNC, HZ/50); 32247def826STheodore Ts'o goto retry_alloc; 32347def826STheodore Ts'o } 32447def826STheodore Ts'o 32596577c43Sdingdinghua /* keep subsequent assertions sane */ 32696577c43Sdingdinghua new_bh->b_state = 0; 32796577c43Sdingdinghua init_buffer(new_bh, NULL, NULL); 32896577c43Sdingdinghua atomic_set(&new_bh->b_count, 1); 32996577c43Sdingdinghua new_jh = jbd2_journal_add_journal_head(new_bh); /* This sleeps */ 330470decc6SDave Kleikamp 331470decc6SDave Kleikamp /* 332470decc6SDave Kleikamp * If a new transaction has already done a buffer copy-out, then 333470decc6SDave Kleikamp * we use that version of the data for the commit. 334470decc6SDave Kleikamp */ 335470decc6SDave Kleikamp jbd_lock_bh_state(bh_in); 336470decc6SDave Kleikamp repeat: 337470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 338470decc6SDave Kleikamp done_copy_out = 1; 339470decc6SDave Kleikamp new_page = virt_to_page(jh_in->b_frozen_data); 340470decc6SDave Kleikamp new_offset = offset_in_page(jh_in->b_frozen_data); 341470decc6SDave Kleikamp } else { 342470decc6SDave Kleikamp new_page = jh2bh(jh_in)->b_page; 343470decc6SDave Kleikamp new_offset = offset_in_page(jh2bh(jh_in)->b_data); 344470decc6SDave Kleikamp } 345470decc6SDave Kleikamp 346470decc6SDave Kleikamp mapped_data = kmap_atomic(new_page, KM_USER0); 347470decc6SDave Kleikamp /* 34813ceef09SJan Kara * Fire data frozen trigger if data already wasn't frozen. Do this 34913ceef09SJan Kara * before checking for escaping, as the trigger may modify the magic 35013ceef09SJan Kara * offset. If a copy-out happens afterwards, it will have the correct 35113ceef09SJan Kara * data in the buffer. 352e06c8227SJoel Becker */ 35313ceef09SJan Kara if (!done_copy_out) 35413ceef09SJan Kara jbd2_buffer_frozen_trigger(jh_in, mapped_data + new_offset, 35513ceef09SJan Kara jh_in->b_triggers); 356e06c8227SJoel Becker 357e06c8227SJoel Becker /* 358470decc6SDave Kleikamp * Check for escaping 359470decc6SDave Kleikamp */ 360470decc6SDave Kleikamp if (*((__be32 *)(mapped_data + new_offset)) == 361f7f4bccbSMingming Cao cpu_to_be32(JBD2_MAGIC_NUMBER)) { 362470decc6SDave Kleikamp need_copy_out = 1; 363470decc6SDave Kleikamp do_escape = 1; 364470decc6SDave Kleikamp } 365470decc6SDave Kleikamp kunmap_atomic(mapped_data, KM_USER0); 366470decc6SDave Kleikamp 367470decc6SDave Kleikamp /* 368470decc6SDave Kleikamp * Do we need to do a data copy? 369470decc6SDave Kleikamp */ 370470decc6SDave Kleikamp if (need_copy_out && !done_copy_out) { 371470decc6SDave Kleikamp char *tmp; 372470decc6SDave Kleikamp 373470decc6SDave Kleikamp jbd_unlock_bh_state(bh_in); 374af1e76d6SMingming Cao tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS); 375e6ec116bSTheodore Ts'o if (!tmp) { 376e6ec116bSTheodore Ts'o jbd2_journal_put_journal_head(new_jh); 377e6ec116bSTheodore Ts'o return -ENOMEM; 378e6ec116bSTheodore Ts'o } 379470decc6SDave Kleikamp jbd_lock_bh_state(bh_in); 380470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 381af1e76d6SMingming Cao jbd2_free(tmp, bh_in->b_size); 382470decc6SDave Kleikamp goto repeat; 383470decc6SDave Kleikamp } 384470decc6SDave Kleikamp 385470decc6SDave Kleikamp jh_in->b_frozen_data = tmp; 386470decc6SDave Kleikamp mapped_data = kmap_atomic(new_page, KM_USER0); 387470decc6SDave Kleikamp memcpy(tmp, mapped_data + new_offset, jh2bh(jh_in)->b_size); 388470decc6SDave Kleikamp kunmap_atomic(mapped_data, KM_USER0); 389470decc6SDave Kleikamp 390470decc6SDave Kleikamp new_page = virt_to_page(tmp); 391470decc6SDave Kleikamp new_offset = offset_in_page(tmp); 392470decc6SDave Kleikamp done_copy_out = 1; 393e06c8227SJoel Becker 394e06c8227SJoel Becker /* 395e06c8227SJoel Becker * This isn't strictly necessary, as we're using frozen 396e06c8227SJoel Becker * data for the escaping, but it keeps consistency with 397e06c8227SJoel Becker * b_frozen_data usage. 398e06c8227SJoel Becker */ 399e06c8227SJoel Becker jh_in->b_frozen_triggers = jh_in->b_triggers; 400470decc6SDave Kleikamp } 401470decc6SDave Kleikamp 402470decc6SDave Kleikamp /* 403470decc6SDave Kleikamp * Did we need to do an escaping? Now we've done all the 404470decc6SDave Kleikamp * copying, we can finally do so. 405470decc6SDave Kleikamp */ 406470decc6SDave Kleikamp if (do_escape) { 407470decc6SDave Kleikamp mapped_data = kmap_atomic(new_page, KM_USER0); 408470decc6SDave Kleikamp *((unsigned int *)(mapped_data + new_offset)) = 0; 409470decc6SDave Kleikamp kunmap_atomic(mapped_data, KM_USER0); 410470decc6SDave Kleikamp } 411470decc6SDave Kleikamp 412470decc6SDave Kleikamp set_bh_page(new_bh, new_page, new_offset); 413470decc6SDave Kleikamp new_jh->b_transaction = NULL; 414470decc6SDave Kleikamp new_bh->b_size = jh2bh(jh_in)->b_size; 415470decc6SDave Kleikamp new_bh->b_bdev = transaction->t_journal->j_dev; 416470decc6SDave Kleikamp new_bh->b_blocknr = blocknr; 417470decc6SDave Kleikamp set_buffer_mapped(new_bh); 418470decc6SDave Kleikamp set_buffer_dirty(new_bh); 419470decc6SDave Kleikamp 420470decc6SDave Kleikamp *jh_out = new_jh; 421470decc6SDave Kleikamp 422470decc6SDave Kleikamp /* 423470decc6SDave Kleikamp * The to-be-written buffer needs to get moved to the io queue, 424470decc6SDave Kleikamp * and the original buffer whose contents we are shadowing or 425470decc6SDave Kleikamp * copying is moved to the transaction's shadow queue. 426470decc6SDave Kleikamp */ 427470decc6SDave Kleikamp JBUFFER_TRACE(jh_in, "file as BJ_Shadow"); 42896577c43Sdingdinghua spin_lock(&journal->j_list_lock); 42996577c43Sdingdinghua __jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow); 43096577c43Sdingdinghua spin_unlock(&journal->j_list_lock); 43196577c43Sdingdinghua jbd_unlock_bh_state(bh_in); 43296577c43Sdingdinghua 433470decc6SDave Kleikamp JBUFFER_TRACE(new_jh, "file as BJ_IO"); 434f7f4bccbSMingming Cao jbd2_journal_file_buffer(new_jh, transaction, BJ_IO); 435470decc6SDave Kleikamp 436470decc6SDave Kleikamp return do_escape | (done_copy_out << 1); 437470decc6SDave Kleikamp } 438470decc6SDave Kleikamp 439470decc6SDave Kleikamp /* 440470decc6SDave Kleikamp * Allocation code for the journal file. Manage the space left in the 441470decc6SDave Kleikamp * journal, so that we can begin checkpointing when appropriate. 442470decc6SDave Kleikamp */ 443470decc6SDave Kleikamp 444470decc6SDave Kleikamp /* 445f7f4bccbSMingming Cao * __jbd2_log_space_left: Return the number of free blocks left in the journal. 446470decc6SDave Kleikamp * 447470decc6SDave Kleikamp * Called with the journal already locked. 448470decc6SDave Kleikamp * 449470decc6SDave Kleikamp * Called under j_state_lock 450470decc6SDave Kleikamp */ 451470decc6SDave Kleikamp 452f7f4bccbSMingming Cao int __jbd2_log_space_left(journal_t *journal) 453470decc6SDave Kleikamp { 454470decc6SDave Kleikamp int left = journal->j_free; 455470decc6SDave Kleikamp 456a931da6aSTheodore Ts'o /* assert_spin_locked(&journal->j_state_lock); */ 457470decc6SDave Kleikamp 458470decc6SDave Kleikamp /* 459470decc6SDave Kleikamp * Be pessimistic here about the number of those free blocks which 460470decc6SDave Kleikamp * might be required for log descriptor control blocks. 461470decc6SDave Kleikamp */ 462470decc6SDave Kleikamp 463470decc6SDave Kleikamp #define MIN_LOG_RESERVED_BLOCKS 32 /* Allow for rounding errors */ 464470decc6SDave Kleikamp 465470decc6SDave Kleikamp left -= MIN_LOG_RESERVED_BLOCKS; 466470decc6SDave Kleikamp 467470decc6SDave Kleikamp if (left <= 0) 468470decc6SDave Kleikamp return 0; 469470decc6SDave Kleikamp left -= (left >> 3); 470470decc6SDave Kleikamp return left; 471470decc6SDave Kleikamp } 472470decc6SDave Kleikamp 473470decc6SDave Kleikamp /* 474e4471831STheodore Ts'o * Called with j_state_lock locked for writing. 475e4471831STheodore Ts'o * Returns true if a transaction commit was started. 476470decc6SDave Kleikamp */ 477f7f4bccbSMingming Cao int __jbd2_log_start_commit(journal_t *journal, tid_t target) 478470decc6SDave Kleikamp { 479470decc6SDave Kleikamp /* 480deeeaf13STheodore Ts'o * The only transaction we can possibly wait upon is the 481deeeaf13STheodore Ts'o * currently running transaction (if it exists). Otherwise, 482deeeaf13STheodore Ts'o * the target tid must be an old one. 483470decc6SDave Kleikamp */ 484deeeaf13STheodore Ts'o if (journal->j_running_transaction && 485deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid == target) { 486470decc6SDave Kleikamp /* 487bcf3d0bcSAndrea Gelmini * We want a new commit: OK, mark the request and wakeup the 488470decc6SDave Kleikamp * commit thread. We do _not_ do the commit ourselves. 489470decc6SDave Kleikamp */ 490470decc6SDave Kleikamp 491470decc6SDave Kleikamp journal->j_commit_request = target; 492f2a44523SEryu Guan jbd_debug(1, "JBD2: requesting commit %d/%d\n", 493470decc6SDave Kleikamp journal->j_commit_request, 494470decc6SDave Kleikamp journal->j_commit_sequence); 495470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 496470decc6SDave Kleikamp return 1; 497deeeaf13STheodore Ts'o } else if (!tid_geq(journal->j_commit_request, target)) 498deeeaf13STheodore Ts'o /* This should never happen, but if it does, preserve 499deeeaf13STheodore Ts'o the evidence before kjournald goes into a loop and 500deeeaf13STheodore Ts'o increments j_commit_sequence beyond all recognition. */ 501f2a44523SEryu Guan WARN_ONCE(1, "JBD2: bad log_start_commit: %u %u %u %u\n", 5021be2add6STheodore Ts'o journal->j_commit_request, 5031be2add6STheodore Ts'o journal->j_commit_sequence, 504deeeaf13STheodore Ts'o target, journal->j_running_transaction ? 505deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid : 0); 506470decc6SDave Kleikamp return 0; 507470decc6SDave Kleikamp } 508470decc6SDave Kleikamp 509f7f4bccbSMingming Cao int jbd2_log_start_commit(journal_t *journal, tid_t tid) 510470decc6SDave Kleikamp { 511470decc6SDave Kleikamp int ret; 512470decc6SDave Kleikamp 513a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 514f7f4bccbSMingming Cao ret = __jbd2_log_start_commit(journal, tid); 515a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 516470decc6SDave Kleikamp return ret; 517470decc6SDave Kleikamp } 518470decc6SDave Kleikamp 519470decc6SDave Kleikamp /* 520470decc6SDave Kleikamp * Force and wait upon a commit if the calling process is not within 521470decc6SDave Kleikamp * transaction. This is used for forcing out undo-protected data which contains 522470decc6SDave Kleikamp * bitmaps, when the fs is running out of space. 523470decc6SDave Kleikamp * 524470decc6SDave Kleikamp * We can only force the running transaction if we don't have an active handle; 525470decc6SDave Kleikamp * otherwise, we will deadlock. 526470decc6SDave Kleikamp * 527470decc6SDave Kleikamp * Returns true if a transaction was started. 528470decc6SDave Kleikamp */ 529f7f4bccbSMingming Cao int jbd2_journal_force_commit_nested(journal_t *journal) 530470decc6SDave Kleikamp { 531470decc6SDave Kleikamp transaction_t *transaction = NULL; 532470decc6SDave Kleikamp tid_t tid; 533e4471831STheodore Ts'o int need_to_start = 0; 534470decc6SDave Kleikamp 535a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 536470decc6SDave Kleikamp if (journal->j_running_transaction && !current->journal_info) { 537470decc6SDave Kleikamp transaction = journal->j_running_transaction; 538e4471831STheodore Ts'o if (!tid_geq(journal->j_commit_request, transaction->t_tid)) 539e4471831STheodore Ts'o need_to_start = 1; 540470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 541470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 542470decc6SDave Kleikamp 543470decc6SDave Kleikamp if (!transaction) { 544a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 545470decc6SDave Kleikamp return 0; /* Nothing to retry */ 546470decc6SDave Kleikamp } 547470decc6SDave Kleikamp 548470decc6SDave Kleikamp tid = transaction->t_tid; 549a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 550e4471831STheodore Ts'o if (need_to_start) 551e4471831STheodore Ts'o jbd2_log_start_commit(journal, tid); 552f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 553470decc6SDave Kleikamp return 1; 554470decc6SDave Kleikamp } 555470decc6SDave Kleikamp 556470decc6SDave Kleikamp /* 557470decc6SDave Kleikamp * Start a commit of the current running transaction (if any). Returns true 558c88ccea3SJan Kara * if a transaction is going to be committed (or is currently already 559c88ccea3SJan Kara * committing), and fills its tid in at *ptid 560470decc6SDave Kleikamp */ 561f7f4bccbSMingming Cao int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) 562470decc6SDave Kleikamp { 563470decc6SDave Kleikamp int ret = 0; 564470decc6SDave Kleikamp 565a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 566470decc6SDave Kleikamp if (journal->j_running_transaction) { 567470decc6SDave Kleikamp tid_t tid = journal->j_running_transaction->t_tid; 568470decc6SDave Kleikamp 569c88ccea3SJan Kara __jbd2_log_start_commit(journal, tid); 570c88ccea3SJan Kara /* There's a running transaction and we've just made sure 571c88ccea3SJan Kara * it's commit has been scheduled. */ 572c88ccea3SJan Kara if (ptid) 573470decc6SDave Kleikamp *ptid = tid; 574c88ccea3SJan Kara ret = 1; 575c88ccea3SJan Kara } else if (journal->j_committing_transaction) { 576470decc6SDave Kleikamp /* 577470decc6SDave Kleikamp * If ext3_write_super() recently started a commit, then we 578470decc6SDave Kleikamp * have to wait for completion of that transaction 579470decc6SDave Kleikamp */ 580c88ccea3SJan Kara if (ptid) 581470decc6SDave Kleikamp *ptid = journal->j_committing_transaction->t_tid; 582470decc6SDave Kleikamp ret = 1; 583470decc6SDave Kleikamp } 584a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 585470decc6SDave Kleikamp return ret; 586470decc6SDave Kleikamp } 587470decc6SDave Kleikamp 588470decc6SDave Kleikamp /* 589bbd2be36SJan Kara * Return 1 if a given transaction has not yet sent barrier request 590bbd2be36SJan Kara * connected with a transaction commit. If 0 is returned, transaction 591bbd2be36SJan Kara * may or may not have sent the barrier. Used to avoid sending barrier 592bbd2be36SJan Kara * twice in common cases. 593bbd2be36SJan Kara */ 594bbd2be36SJan Kara int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid) 595bbd2be36SJan Kara { 596bbd2be36SJan Kara int ret = 0; 597bbd2be36SJan Kara transaction_t *commit_trans; 598bbd2be36SJan Kara 599bbd2be36SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 600bbd2be36SJan Kara return 0; 601bbd2be36SJan Kara read_lock(&journal->j_state_lock); 602bbd2be36SJan Kara /* Transaction already committed? */ 603bbd2be36SJan Kara if (tid_geq(journal->j_commit_sequence, tid)) 604bbd2be36SJan Kara goto out; 605bbd2be36SJan Kara commit_trans = journal->j_committing_transaction; 606bbd2be36SJan Kara if (!commit_trans || commit_trans->t_tid != tid) { 607bbd2be36SJan Kara ret = 1; 608bbd2be36SJan Kara goto out; 609bbd2be36SJan Kara } 610bbd2be36SJan Kara /* 611bbd2be36SJan Kara * Transaction is being committed and we already proceeded to 612bbd2be36SJan Kara * submitting a flush to fs partition? 613bbd2be36SJan Kara */ 614bbd2be36SJan Kara if (journal->j_fs_dev != journal->j_dev) { 615bbd2be36SJan Kara if (!commit_trans->t_need_data_flush || 616bbd2be36SJan Kara commit_trans->t_state >= T_COMMIT_DFLUSH) 617bbd2be36SJan Kara goto out; 618bbd2be36SJan Kara } else { 619bbd2be36SJan Kara if (commit_trans->t_state >= T_COMMIT_JFLUSH) 620bbd2be36SJan Kara goto out; 621bbd2be36SJan Kara } 622bbd2be36SJan Kara ret = 1; 623bbd2be36SJan Kara out: 624bbd2be36SJan Kara read_unlock(&journal->j_state_lock); 625bbd2be36SJan Kara return ret; 626bbd2be36SJan Kara } 627bbd2be36SJan Kara EXPORT_SYMBOL(jbd2_trans_will_send_data_barrier); 628bbd2be36SJan Kara 629bbd2be36SJan Kara /* 630470decc6SDave Kleikamp * Wait for a specified commit to complete. 631470decc6SDave Kleikamp * The caller may not hold the journal lock. 632470decc6SDave Kleikamp */ 633f7f4bccbSMingming Cao int jbd2_log_wait_commit(journal_t *journal, tid_t tid) 634470decc6SDave Kleikamp { 635470decc6SDave Kleikamp int err = 0; 636470decc6SDave Kleikamp 637a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 638e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 639470decc6SDave Kleikamp if (!tid_geq(journal->j_commit_request, tid)) { 640470decc6SDave Kleikamp printk(KERN_EMERG 641470decc6SDave Kleikamp "%s: error: j_commit_request=%d, tid=%d\n", 642329d291fSHarvey Harrison __func__, journal->j_commit_request, tid); 643470decc6SDave Kleikamp } 644470decc6SDave Kleikamp #endif 645470decc6SDave Kleikamp while (tid_gt(tid, journal->j_commit_sequence)) { 646f2a44523SEryu Guan jbd_debug(1, "JBD2: want %d, j_commit_sequence=%d\n", 647470decc6SDave Kleikamp tid, journal->j_commit_sequence); 648470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 649a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 650470decc6SDave Kleikamp wait_event(journal->j_wait_done_commit, 651470decc6SDave Kleikamp !tid_gt(tid, journal->j_commit_sequence)); 652a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 653470decc6SDave Kleikamp } 654a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 655470decc6SDave Kleikamp 656470decc6SDave Kleikamp if (unlikely(is_journal_aborted(journal))) { 657470decc6SDave Kleikamp printk(KERN_EMERG "journal commit I/O error\n"); 658470decc6SDave Kleikamp err = -EIO; 659470decc6SDave Kleikamp } 660470decc6SDave Kleikamp return err; 661470decc6SDave Kleikamp } 662470decc6SDave Kleikamp 663470decc6SDave Kleikamp /* 664470decc6SDave Kleikamp * Log buffer allocation routines: 665470decc6SDave Kleikamp */ 666470decc6SDave Kleikamp 66718eba7aaSMingming Cao int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) 668470decc6SDave Kleikamp { 669470decc6SDave Kleikamp unsigned long blocknr; 670470decc6SDave Kleikamp 671a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 672470decc6SDave Kleikamp J_ASSERT(journal->j_free > 1); 673470decc6SDave Kleikamp 674470decc6SDave Kleikamp blocknr = journal->j_head; 675470decc6SDave Kleikamp journal->j_head++; 676470decc6SDave Kleikamp journal->j_free--; 677470decc6SDave Kleikamp if (journal->j_head == journal->j_last) 678470decc6SDave Kleikamp journal->j_head = journal->j_first; 679a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 680f7f4bccbSMingming Cao return jbd2_journal_bmap(journal, blocknr, retp); 681470decc6SDave Kleikamp } 682470decc6SDave Kleikamp 683470decc6SDave Kleikamp /* 684470decc6SDave Kleikamp * Conversion of logical to physical block numbers for the journal 685470decc6SDave Kleikamp * 686470decc6SDave Kleikamp * On external journals the journal blocks are identity-mapped, so 687470decc6SDave Kleikamp * this is a no-op. If needed, we can use j_blk_offset - everything is 688470decc6SDave Kleikamp * ready. 689470decc6SDave Kleikamp */ 690f7f4bccbSMingming Cao int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, 69118eba7aaSMingming Cao unsigned long long *retp) 692470decc6SDave Kleikamp { 693470decc6SDave Kleikamp int err = 0; 69418eba7aaSMingming Cao unsigned long long ret; 695470decc6SDave Kleikamp 696470decc6SDave Kleikamp if (journal->j_inode) { 697470decc6SDave Kleikamp ret = bmap(journal->j_inode, blocknr); 698470decc6SDave Kleikamp if (ret) 699470decc6SDave Kleikamp *retp = ret; 700470decc6SDave Kleikamp else { 701470decc6SDave Kleikamp printk(KERN_ALERT "%s: journal block not found " 702470decc6SDave Kleikamp "at offset %lu on %s\n", 70305496769STheodore Ts'o __func__, blocknr, journal->j_devname); 704470decc6SDave Kleikamp err = -EIO; 705470decc6SDave Kleikamp __journal_abort_soft(journal, err); 706470decc6SDave Kleikamp } 707470decc6SDave Kleikamp } else { 708470decc6SDave Kleikamp *retp = blocknr; /* +journal->j_blk_offset */ 709470decc6SDave Kleikamp } 710470decc6SDave Kleikamp return err; 711470decc6SDave Kleikamp } 712470decc6SDave Kleikamp 713470decc6SDave Kleikamp /* 714470decc6SDave Kleikamp * We play buffer_head aliasing tricks to write data/metadata blocks to 715470decc6SDave Kleikamp * the journal without copying their contents, but for journal 716470decc6SDave Kleikamp * descriptor blocks we do need to generate bona fide buffers. 717470decc6SDave Kleikamp * 718f7f4bccbSMingming Cao * After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying 719470decc6SDave Kleikamp * the buffer's contents they really should run flush_dcache_page(bh->b_page). 720470decc6SDave Kleikamp * But we don't bother doing that, so there will be coherency problems with 721470decc6SDave Kleikamp * mmaps of blockdevs which hold live JBD-controlled filesystems. 722470decc6SDave Kleikamp */ 723f7f4bccbSMingming Cao struct journal_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) 724470decc6SDave Kleikamp { 725470decc6SDave Kleikamp struct buffer_head *bh; 72618eba7aaSMingming Cao unsigned long long blocknr; 727470decc6SDave Kleikamp int err; 728470decc6SDave Kleikamp 729f7f4bccbSMingming Cao err = jbd2_journal_next_log_block(journal, &blocknr); 730470decc6SDave Kleikamp 731470decc6SDave Kleikamp if (err) 732470decc6SDave Kleikamp return NULL; 733470decc6SDave Kleikamp 734470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 7354b905671SJan Kara if (!bh) 7364b905671SJan Kara return NULL; 737470decc6SDave Kleikamp lock_buffer(bh); 738470decc6SDave Kleikamp memset(bh->b_data, 0, journal->j_blocksize); 739470decc6SDave Kleikamp set_buffer_uptodate(bh); 740470decc6SDave Kleikamp unlock_buffer(bh); 741470decc6SDave Kleikamp BUFFER_TRACE(bh, "return this buffer"); 742f7f4bccbSMingming Cao return jbd2_journal_add_journal_head(bh); 743470decc6SDave Kleikamp } 744470decc6SDave Kleikamp 745*79feb521SJan Kara /* 746*79feb521SJan Kara * Return tid of the oldest transaction in the journal and block in the journal 747*79feb521SJan Kara * where the transaction starts. 748*79feb521SJan Kara * 749*79feb521SJan Kara * If the journal is now empty, return which will be the next transaction ID 750*79feb521SJan Kara * we will write and where will that transaction start. 751*79feb521SJan Kara * 752*79feb521SJan Kara * The return value is 0 if journal tail cannot be pushed any further, 1 if 753*79feb521SJan Kara * it can. 754*79feb521SJan Kara */ 755*79feb521SJan Kara int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, 756*79feb521SJan Kara unsigned long *block) 757*79feb521SJan Kara { 758*79feb521SJan Kara transaction_t *transaction; 759*79feb521SJan Kara int ret; 760*79feb521SJan Kara 761*79feb521SJan Kara read_lock(&journal->j_state_lock); 762*79feb521SJan Kara spin_lock(&journal->j_list_lock); 763*79feb521SJan Kara transaction = journal->j_checkpoint_transactions; 764*79feb521SJan Kara if (transaction) { 765*79feb521SJan Kara *tid = transaction->t_tid; 766*79feb521SJan Kara *block = transaction->t_log_start; 767*79feb521SJan Kara } else if ((transaction = journal->j_committing_transaction) != NULL) { 768*79feb521SJan Kara *tid = transaction->t_tid; 769*79feb521SJan Kara *block = transaction->t_log_start; 770*79feb521SJan Kara } else if ((transaction = journal->j_running_transaction) != NULL) { 771*79feb521SJan Kara *tid = transaction->t_tid; 772*79feb521SJan Kara *block = journal->j_head; 773*79feb521SJan Kara } else { 774*79feb521SJan Kara *tid = journal->j_transaction_sequence; 775*79feb521SJan Kara *block = journal->j_head; 776*79feb521SJan Kara } 777*79feb521SJan Kara ret = tid_gt(*tid, journal->j_tail_sequence); 778*79feb521SJan Kara spin_unlock(&journal->j_list_lock); 779*79feb521SJan Kara read_unlock(&journal->j_state_lock); 780*79feb521SJan Kara 781*79feb521SJan Kara return ret; 782*79feb521SJan Kara } 783*79feb521SJan Kara 784*79feb521SJan Kara /* 785*79feb521SJan Kara * Update information in journal structure and in on disk journal superblock 786*79feb521SJan Kara * about log tail. This function does not check whether information passed in 787*79feb521SJan Kara * really pushes log tail further. It's responsibility of the caller to make 788*79feb521SJan Kara * sure provided log tail information is valid (e.g. by holding 789*79feb521SJan Kara * j_checkpoint_mutex all the time between computing log tail and calling this 790*79feb521SJan Kara * function as is the case with jbd2_cleanup_journal_tail()). 791*79feb521SJan Kara * 792*79feb521SJan Kara * Requires j_checkpoint_mutex 793*79feb521SJan Kara */ 794*79feb521SJan Kara void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 795*79feb521SJan Kara { 796*79feb521SJan Kara unsigned long freed; 797*79feb521SJan Kara 798*79feb521SJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 799*79feb521SJan Kara 800*79feb521SJan Kara /* 801*79feb521SJan Kara * We cannot afford for write to remain in drive's caches since as 802*79feb521SJan Kara * soon as we update j_tail, next transaction can start reusing journal 803*79feb521SJan Kara * space and if we lose sb update during power failure we'd replay 804*79feb521SJan Kara * old transaction with possibly newly overwritten data. 805*79feb521SJan Kara */ 806*79feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, tid, block, WRITE_FUA); 807*79feb521SJan Kara write_lock(&journal->j_state_lock); 808*79feb521SJan Kara freed = block - journal->j_tail; 809*79feb521SJan Kara if (block < journal->j_tail) 810*79feb521SJan Kara freed += journal->j_last - journal->j_first; 811*79feb521SJan Kara 812*79feb521SJan Kara trace_jbd2_update_log_tail(journal, tid, block, freed); 813*79feb521SJan Kara jbd_debug(1, 814*79feb521SJan Kara "Cleaning journal tail from %d to %d (offset %lu), " 815*79feb521SJan Kara "freeing %lu\n", 816*79feb521SJan Kara journal->j_tail_sequence, tid, block, freed); 817*79feb521SJan Kara 818*79feb521SJan Kara journal->j_free += freed; 819*79feb521SJan Kara journal->j_tail_sequence = tid; 820*79feb521SJan Kara journal->j_tail = block; 821*79feb521SJan Kara write_unlock(&journal->j_state_lock); 822*79feb521SJan Kara } 823*79feb521SJan Kara 8248e85fb3fSJohann Lombardi struct jbd2_stats_proc_session { 8258e85fb3fSJohann Lombardi journal_t *journal; 8268e85fb3fSJohann Lombardi struct transaction_stats_s *stats; 8278e85fb3fSJohann Lombardi int start; 8288e85fb3fSJohann Lombardi int max; 8298e85fb3fSJohann Lombardi }; 8308e85fb3fSJohann Lombardi 8318e85fb3fSJohann Lombardi static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) 8328e85fb3fSJohann Lombardi { 8338e85fb3fSJohann Lombardi return *pos ? NULL : SEQ_START_TOKEN; 8348e85fb3fSJohann Lombardi } 8358e85fb3fSJohann Lombardi 8368e85fb3fSJohann Lombardi static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) 8378e85fb3fSJohann Lombardi { 8388e85fb3fSJohann Lombardi return NULL; 8398e85fb3fSJohann Lombardi } 8408e85fb3fSJohann Lombardi 8418e85fb3fSJohann Lombardi static int jbd2_seq_info_show(struct seq_file *seq, void *v) 8428e85fb3fSJohann Lombardi { 8438e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 8448e85fb3fSJohann Lombardi 8458e85fb3fSJohann Lombardi if (v != SEQ_START_TOKEN) 8468e85fb3fSJohann Lombardi return 0; 8478e85fb3fSJohann Lombardi seq_printf(seq, "%lu transaction, each up to %u blocks\n", 8488e85fb3fSJohann Lombardi s->stats->ts_tid, 8498e85fb3fSJohann Lombardi s->journal->j_max_transaction_buffers); 8508e85fb3fSJohann Lombardi if (s->stats->ts_tid == 0) 8518e85fb3fSJohann Lombardi return 0; 8528e85fb3fSJohann Lombardi seq_printf(seq, "average: \n %ums waiting for transaction\n", 853bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); 8548e85fb3fSJohann Lombardi seq_printf(seq, " %ums running transaction\n", 855bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); 8568e85fb3fSJohann Lombardi seq_printf(seq, " %ums transaction was being locked\n", 857bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); 8588e85fb3fSJohann Lombardi seq_printf(seq, " %ums flushing data (in ordered mode)\n", 859bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); 8608e85fb3fSJohann Lombardi seq_printf(seq, " %ums logging transaction\n", 861bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); 862c225aa57SSimon Holm Thøgersen seq_printf(seq, " %lluus average transaction commit time\n", 863c225aa57SSimon Holm Thøgersen div_u64(s->journal->j_average_commit_time, 1000)); 8648e85fb3fSJohann Lombardi seq_printf(seq, " %lu handles per transaction\n", 865bf699327STheodore Ts'o s->stats->run.rs_handle_count / s->stats->ts_tid); 8668e85fb3fSJohann Lombardi seq_printf(seq, " %lu blocks per transaction\n", 867bf699327STheodore Ts'o s->stats->run.rs_blocks / s->stats->ts_tid); 8688e85fb3fSJohann Lombardi seq_printf(seq, " %lu logged blocks per transaction\n", 869bf699327STheodore Ts'o s->stats->run.rs_blocks_logged / s->stats->ts_tid); 8708e85fb3fSJohann Lombardi return 0; 8718e85fb3fSJohann Lombardi } 8728e85fb3fSJohann Lombardi 8738e85fb3fSJohann Lombardi static void jbd2_seq_info_stop(struct seq_file *seq, void *v) 8748e85fb3fSJohann Lombardi { 8758e85fb3fSJohann Lombardi } 8768e85fb3fSJohann Lombardi 87788e9d34cSJames Morris static const struct seq_operations jbd2_seq_info_ops = { 8788e85fb3fSJohann Lombardi .start = jbd2_seq_info_start, 8798e85fb3fSJohann Lombardi .next = jbd2_seq_info_next, 8808e85fb3fSJohann Lombardi .stop = jbd2_seq_info_stop, 8818e85fb3fSJohann Lombardi .show = jbd2_seq_info_show, 8828e85fb3fSJohann Lombardi }; 8838e85fb3fSJohann Lombardi 8848e85fb3fSJohann Lombardi static int jbd2_seq_info_open(struct inode *inode, struct file *file) 8858e85fb3fSJohann Lombardi { 8868e85fb3fSJohann Lombardi journal_t *journal = PDE(inode)->data; 8878e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 8888e85fb3fSJohann Lombardi int rc, size; 8898e85fb3fSJohann Lombardi 8908e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 8918e85fb3fSJohann Lombardi if (s == NULL) 8928e85fb3fSJohann Lombardi return -ENOMEM; 8938e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s); 8948e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 8958e85fb3fSJohann Lombardi if (s->stats == NULL) { 8968e85fb3fSJohann Lombardi kfree(s); 8978e85fb3fSJohann Lombardi return -ENOMEM; 8988e85fb3fSJohann Lombardi } 8998e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 9008e85fb3fSJohann Lombardi memcpy(s->stats, &journal->j_stats, size); 9018e85fb3fSJohann Lombardi s->journal = journal; 9028e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 9038e85fb3fSJohann Lombardi 9048e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_info_ops); 9058e85fb3fSJohann Lombardi if (rc == 0) { 9068e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 9078e85fb3fSJohann Lombardi m->private = s; 9088e85fb3fSJohann Lombardi } else { 9098e85fb3fSJohann Lombardi kfree(s->stats); 9108e85fb3fSJohann Lombardi kfree(s); 9118e85fb3fSJohann Lombardi } 9128e85fb3fSJohann Lombardi return rc; 9138e85fb3fSJohann Lombardi 9148e85fb3fSJohann Lombardi } 9158e85fb3fSJohann Lombardi 9168e85fb3fSJohann Lombardi static int jbd2_seq_info_release(struct inode *inode, struct file *file) 9178e85fb3fSJohann Lombardi { 9188e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 9198e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 9208e85fb3fSJohann Lombardi kfree(s->stats); 9218e85fb3fSJohann Lombardi kfree(s); 9228e85fb3fSJohann Lombardi return seq_release(inode, file); 9238e85fb3fSJohann Lombardi } 9248e85fb3fSJohann Lombardi 925828c0950SAlexey Dobriyan static const struct file_operations jbd2_seq_info_fops = { 9268e85fb3fSJohann Lombardi .owner = THIS_MODULE, 9278e85fb3fSJohann Lombardi .open = jbd2_seq_info_open, 9288e85fb3fSJohann Lombardi .read = seq_read, 9298e85fb3fSJohann Lombardi .llseek = seq_lseek, 9308e85fb3fSJohann Lombardi .release = jbd2_seq_info_release, 9318e85fb3fSJohann Lombardi }; 9328e85fb3fSJohann Lombardi 9338e85fb3fSJohann Lombardi static struct proc_dir_entry *proc_jbd2_stats; 9348e85fb3fSJohann Lombardi 9358e85fb3fSJohann Lombardi static void jbd2_stats_proc_init(journal_t *journal) 9368e85fb3fSJohann Lombardi { 93705496769STheodore Ts'o journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); 9388e85fb3fSJohann Lombardi if (journal->j_proc_entry) { 93979da3664SDenis V. Lunev proc_create_data("info", S_IRUGO, journal->j_proc_entry, 94079da3664SDenis V. Lunev &jbd2_seq_info_fops, journal); 9418e85fb3fSJohann Lombardi } 9428e85fb3fSJohann Lombardi } 9438e85fb3fSJohann Lombardi 9448e85fb3fSJohann Lombardi static void jbd2_stats_proc_exit(journal_t *journal) 9458e85fb3fSJohann Lombardi { 9468e85fb3fSJohann Lombardi remove_proc_entry("info", journal->j_proc_entry); 94705496769STheodore Ts'o remove_proc_entry(journal->j_devname, proc_jbd2_stats); 9488e85fb3fSJohann Lombardi } 9498e85fb3fSJohann Lombardi 950470decc6SDave Kleikamp /* 951470decc6SDave Kleikamp * Management for journal control blocks: functions to create and 952470decc6SDave Kleikamp * destroy journal_t structures, and to initialise and read existing 953470decc6SDave Kleikamp * journal blocks from disk. */ 954470decc6SDave Kleikamp 955470decc6SDave Kleikamp /* First: create and setup a journal_t object in memory. We initialise 956470decc6SDave Kleikamp * very few fields yet: that has to wait until we have created the 957470decc6SDave Kleikamp * journal structures from from scratch, or loaded them from disk. */ 958470decc6SDave Kleikamp 959470decc6SDave Kleikamp static journal_t * journal_init_common (void) 960470decc6SDave Kleikamp { 961470decc6SDave Kleikamp journal_t *journal; 962470decc6SDave Kleikamp int err; 963470decc6SDave Kleikamp 9643ebfdf88SAndrew Morton journal = kzalloc(sizeof(*journal), GFP_KERNEL); 965470decc6SDave Kleikamp if (!journal) 966b7271b0aSTheodore Ts'o return NULL; 967470decc6SDave Kleikamp 968470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_transaction_locked); 969470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_logspace); 970470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_done_commit); 971470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_checkpoint); 972470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_commit); 973470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_updates); 974470decc6SDave Kleikamp mutex_init(&journal->j_barrier); 975470decc6SDave Kleikamp mutex_init(&journal->j_checkpoint_mutex); 976470decc6SDave Kleikamp spin_lock_init(&journal->j_revoke_lock); 977470decc6SDave Kleikamp spin_lock_init(&journal->j_list_lock); 978a931da6aSTheodore Ts'o rwlock_init(&journal->j_state_lock); 979470decc6SDave Kleikamp 980cd02ff0bSMingming Cao journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); 98130773840STheodore Ts'o journal->j_min_batch_time = 0; 98230773840STheodore Ts'o journal->j_max_batch_time = 15000; /* 15ms */ 983470decc6SDave Kleikamp 984470decc6SDave Kleikamp /* The journal is marked for error until we succeed with recovery! */ 985f7f4bccbSMingming Cao journal->j_flags = JBD2_ABORT; 986470decc6SDave Kleikamp 987470decc6SDave Kleikamp /* Set up a default-sized revoke table for the new mount. */ 988f7f4bccbSMingming Cao err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); 989470decc6SDave Kleikamp if (err) { 990470decc6SDave Kleikamp kfree(journal); 991b7271b0aSTheodore Ts'o return NULL; 992470decc6SDave Kleikamp } 9938e85fb3fSJohann Lombardi 994bf699327STheodore Ts'o spin_lock_init(&journal->j_history_lock); 9958e85fb3fSJohann Lombardi 996470decc6SDave Kleikamp return journal; 997470decc6SDave Kleikamp } 998470decc6SDave Kleikamp 999f7f4bccbSMingming Cao /* jbd2_journal_init_dev and jbd2_journal_init_inode: 1000470decc6SDave Kleikamp * 1001470decc6SDave Kleikamp * Create a journal structure assigned some fixed set of disk blocks to 1002470decc6SDave Kleikamp * the journal. We don't actually touch those disk blocks yet, but we 1003470decc6SDave Kleikamp * need to set up all of the mapping information to tell the journaling 1004470decc6SDave Kleikamp * system where the journal blocks are. 1005470decc6SDave Kleikamp * 1006470decc6SDave Kleikamp */ 1007470decc6SDave Kleikamp 1008470decc6SDave Kleikamp /** 10095648ba5bSRandy Dunlap * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure 1010470decc6SDave Kleikamp * @bdev: Block device on which to create the journal 1011470decc6SDave Kleikamp * @fs_dev: Device which hold journalled filesystem for this journal. 1012470decc6SDave Kleikamp * @start: Block nr Start of journal. 1013470decc6SDave Kleikamp * @len: Length of the journal in blocks. 1014470decc6SDave Kleikamp * @blocksize: blocksize of journalling device 10155648ba5bSRandy Dunlap * 10165648ba5bSRandy Dunlap * Returns: a newly created journal_t * 1017470decc6SDave Kleikamp * 1018f7f4bccbSMingming Cao * jbd2_journal_init_dev creates a journal which maps a fixed contiguous 1019470decc6SDave Kleikamp * range of blocks on an arbitrary block device. 1020470decc6SDave Kleikamp * 1021470decc6SDave Kleikamp */ 1022f7f4bccbSMingming Cao journal_t * jbd2_journal_init_dev(struct block_device *bdev, 1023470decc6SDave Kleikamp struct block_device *fs_dev, 102418eba7aaSMingming Cao unsigned long long start, int len, int blocksize) 1025470decc6SDave Kleikamp { 1026470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 1027470decc6SDave Kleikamp struct buffer_head *bh; 102805496769STheodore Ts'o char *p; 1029470decc6SDave Kleikamp int n; 1030470decc6SDave Kleikamp 1031470decc6SDave Kleikamp if (!journal) 1032470decc6SDave Kleikamp return NULL; 1033470decc6SDave Kleikamp 1034470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1035470decc6SDave Kleikamp journal->j_blocksize = blocksize; 10360587aa3dSyangsheng journal->j_dev = bdev; 10370587aa3dSyangsheng journal->j_fs_dev = fs_dev; 10380587aa3dSyangsheng journal->j_blk_offset = start; 10390587aa3dSyangsheng journal->j_maxlen = len; 10400587aa3dSyangsheng bdevname(journal->j_dev, journal->j_devname); 10410587aa3dSyangsheng p = journal->j_devname; 10420587aa3dSyangsheng while ((p = strchr(p, '/'))) 10430587aa3dSyangsheng *p = '!'; 10444b905671SJan Kara jbd2_stats_proc_init(journal); 1045470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1046470decc6SDave Kleikamp journal->j_wbufsize = n; 1047470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1048470decc6SDave Kleikamp if (!journal->j_wbuf) { 104925985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1050329d291fSHarvey Harrison __func__); 10514b905671SJan Kara goto out_err; 1052470decc6SDave Kleikamp } 1053470decc6SDave Kleikamp 1054470decc6SDave Kleikamp bh = __getblk(journal->j_dev, start, journal->j_blocksize); 10554b905671SJan Kara if (!bh) { 10564b905671SJan Kara printk(KERN_ERR 10574b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 10584b905671SJan Kara __func__); 10594b905671SJan Kara goto out_err; 10604b905671SJan Kara } 1061470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1062470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 10634b905671SJan Kara 1064470decc6SDave Kleikamp return journal; 10654b905671SJan Kara out_err: 10667b02bec0STao Ma kfree(journal->j_wbuf); 10674b905671SJan Kara jbd2_stats_proc_exit(journal); 10684b905671SJan Kara kfree(journal); 10694b905671SJan Kara return NULL; 1070470decc6SDave Kleikamp } 1071470decc6SDave Kleikamp 1072470decc6SDave Kleikamp /** 1073f7f4bccbSMingming Cao * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. 1074470decc6SDave Kleikamp * @inode: An inode to create the journal in 1075470decc6SDave Kleikamp * 1076f7f4bccbSMingming Cao * jbd2_journal_init_inode creates a journal which maps an on-disk inode as 1077470decc6SDave Kleikamp * the journal. The inode must exist already, must support bmap() and 1078470decc6SDave Kleikamp * must have all data blocks preallocated. 1079470decc6SDave Kleikamp */ 1080f7f4bccbSMingming Cao journal_t * jbd2_journal_init_inode (struct inode *inode) 1081470decc6SDave Kleikamp { 1082470decc6SDave Kleikamp struct buffer_head *bh; 1083470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 108405496769STheodore Ts'o char *p; 1085470decc6SDave Kleikamp int err; 1086470decc6SDave Kleikamp int n; 108718eba7aaSMingming Cao unsigned long long blocknr; 1088470decc6SDave Kleikamp 1089470decc6SDave Kleikamp if (!journal) 1090470decc6SDave Kleikamp return NULL; 1091470decc6SDave Kleikamp 1092470decc6SDave Kleikamp journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; 1093470decc6SDave Kleikamp journal->j_inode = inode; 109405496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 109505496769STheodore Ts'o p = journal->j_devname; 109605496769STheodore Ts'o while ((p = strchr(p, '/'))) 109705496769STheodore Ts'o *p = '!'; 109805496769STheodore Ts'o p = journal->j_devname + strlen(journal->j_devname); 109990576c0bSTheodore Ts'o sprintf(p, "-%lu", journal->j_inode->i_ino); 1100470decc6SDave Kleikamp jbd_debug(1, 1101470decc6SDave Kleikamp "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", 1102470decc6SDave Kleikamp journal, inode->i_sb->s_id, inode->i_ino, 1103470decc6SDave Kleikamp (long long) inode->i_size, 1104470decc6SDave Kleikamp inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); 1105470decc6SDave Kleikamp 1106470decc6SDave Kleikamp journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; 1107470decc6SDave Kleikamp journal->j_blocksize = inode->i_sb->s_blocksize; 11088e85fb3fSJohann Lombardi jbd2_stats_proc_init(journal); 1109470decc6SDave Kleikamp 1110470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1111470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1112470decc6SDave Kleikamp journal->j_wbufsize = n; 1113470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1114470decc6SDave Kleikamp if (!journal->j_wbuf) { 111525985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1116329d291fSHarvey Harrison __func__); 11174b905671SJan Kara goto out_err; 1118470decc6SDave Kleikamp } 1119470decc6SDave Kleikamp 1120f7f4bccbSMingming Cao err = jbd2_journal_bmap(journal, 0, &blocknr); 1121470decc6SDave Kleikamp /* If that failed, give up */ 1122470decc6SDave Kleikamp if (err) { 11233c26bdb4SJustin P. Mattock printk(KERN_ERR "%s: Cannot locate journal superblock\n", 1124329d291fSHarvey Harrison __func__); 11254b905671SJan Kara goto out_err; 1126470decc6SDave Kleikamp } 1127470decc6SDave Kleikamp 1128470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 11294b905671SJan Kara if (!bh) { 11304b905671SJan Kara printk(KERN_ERR 11314b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 11324b905671SJan Kara __func__); 11334b905671SJan Kara goto out_err; 11344b905671SJan Kara } 1135470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1136470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 1137470decc6SDave Kleikamp 1138470decc6SDave Kleikamp return journal; 11394b905671SJan Kara out_err: 11407b02bec0STao Ma kfree(journal->j_wbuf); 11414b905671SJan Kara jbd2_stats_proc_exit(journal); 11424b905671SJan Kara kfree(journal); 11434b905671SJan Kara return NULL; 1144470decc6SDave Kleikamp } 1145470decc6SDave Kleikamp 1146470decc6SDave Kleikamp /* 1147470decc6SDave Kleikamp * If the journal init or create aborts, we need to mark the journal 1148470decc6SDave Kleikamp * superblock as being NULL to prevent the journal destroy from writing 1149470decc6SDave Kleikamp * back a bogus superblock. 1150470decc6SDave Kleikamp */ 1151470decc6SDave Kleikamp static void journal_fail_superblock (journal_t *journal) 1152470decc6SDave Kleikamp { 1153470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1154470decc6SDave Kleikamp brelse(bh); 1155470decc6SDave Kleikamp journal->j_sb_buffer = NULL; 1156470decc6SDave Kleikamp } 1157470decc6SDave Kleikamp 1158470decc6SDave Kleikamp /* 1159470decc6SDave Kleikamp * Given a journal_t structure, initialise the various fields for 1160470decc6SDave Kleikamp * startup of a new journaling session. We use this both when creating 1161470decc6SDave Kleikamp * a journal, and after recovering an old journal to reset it for 1162470decc6SDave Kleikamp * subsequent use. 1163470decc6SDave Kleikamp */ 1164470decc6SDave Kleikamp 1165470decc6SDave Kleikamp static int journal_reset(journal_t *journal) 1166470decc6SDave Kleikamp { 1167470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 116818eba7aaSMingming Cao unsigned long long first, last; 1169470decc6SDave Kleikamp 1170470decc6SDave Kleikamp first = be32_to_cpu(sb->s_first); 1171470decc6SDave Kleikamp last = be32_to_cpu(sb->s_maxlen); 1172f6f50e28SJan Kara if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { 1173f2a44523SEryu Guan printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu).\n", 1174f6f50e28SJan Kara first, last); 1175f6f50e28SJan Kara journal_fail_superblock(journal); 1176f6f50e28SJan Kara return -EINVAL; 1177f6f50e28SJan Kara } 1178470decc6SDave Kleikamp 1179470decc6SDave Kleikamp journal->j_first = first; 1180470decc6SDave Kleikamp journal->j_last = last; 1181470decc6SDave Kleikamp 1182470decc6SDave Kleikamp journal->j_head = first; 1183470decc6SDave Kleikamp journal->j_tail = first; 1184470decc6SDave Kleikamp journal->j_free = last - first; 1185470decc6SDave Kleikamp 1186470decc6SDave Kleikamp journal->j_tail_sequence = journal->j_transaction_sequence; 1187470decc6SDave Kleikamp journal->j_commit_sequence = journal->j_transaction_sequence - 1; 1188470decc6SDave Kleikamp journal->j_commit_request = journal->j_commit_sequence; 1189470decc6SDave Kleikamp 1190470decc6SDave Kleikamp journal->j_max_transaction_buffers = journal->j_maxlen / 4; 1191470decc6SDave Kleikamp 1192470decc6SDave Kleikamp /* 1193470decc6SDave Kleikamp * As a special case, if the on-disk copy is already marked as needing 119424bcc89cSJan Kara * no recovery (s_start == 0), then we can safely defer the superblock 119524bcc89cSJan Kara * update until the next commit by setting JBD2_FLUSHED. This avoids 1196470decc6SDave Kleikamp * attempting a write to a potential-readonly device. 1197470decc6SDave Kleikamp */ 119824bcc89cSJan Kara if (sb->s_start == 0) { 1199f2a44523SEryu Guan jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " 1200470decc6SDave Kleikamp "(start %ld, seq %d, errno %d)\n", 1201470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, 1202470decc6SDave Kleikamp journal->j_errno); 120324bcc89cSJan Kara journal->j_flags |= JBD2_FLUSHED; 120424bcc89cSJan Kara } else { 1205a78bb11dSJan Kara /* Lock here to make assertions happy... */ 1206a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 1207*79feb521SJan Kara /* 1208*79feb521SJan Kara * Update log tail information. We use WRITE_FUA since new 1209*79feb521SJan Kara * transaction will start reusing journal space and so we 1210*79feb521SJan Kara * must make sure information about current log tail is on 1211*79feb521SJan Kara * disk before that. 1212*79feb521SJan Kara */ 1213*79feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, 1214*79feb521SJan Kara journal->j_tail_sequence, 1215*79feb521SJan Kara journal->j_tail, 1216*79feb521SJan Kara WRITE_FUA); 1217a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 121824bcc89cSJan Kara } 121924bcc89cSJan Kara return jbd2_journal_start_thread(journal); 1220470decc6SDave Kleikamp } 1221470decc6SDave Kleikamp 1222*79feb521SJan Kara static void jbd2_write_superblock(journal_t *journal, int write_op) 122324bcc89cSJan Kara { 122424bcc89cSJan Kara struct buffer_head *bh = journal->j_sb_buffer; 1225*79feb521SJan Kara int ret; 122624bcc89cSJan Kara 1227*79feb521SJan Kara trace_jbd2_write_superblock(journal, write_op); 1228*79feb521SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 1229*79feb521SJan Kara write_op &= ~(REQ_FUA | REQ_FLUSH); 1230*79feb521SJan Kara lock_buffer(bh); 1231914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1232914258bfSTheodore Ts'o /* 1233914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the journal 1234914258bfSTheodore Ts'o * superblock failed. This could happen because the 1235914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 1236914258bfSTheodore Ts'o * be a transient write error and maybe the block will 1237914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 1238914258bfSTheodore Ts'o * write and hope for the best. 1239914258bfSTheodore Ts'o */ 1240914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: previous I/O error detected " 1241914258bfSTheodore Ts'o "for journal superblock update for %s.\n", 1242914258bfSTheodore Ts'o journal->j_devname); 1243914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1244914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1245914258bfSTheodore Ts'o } 1246*79feb521SJan Kara get_bh(bh); 1247*79feb521SJan Kara bh->b_end_io = end_buffer_write_sync; 1248*79feb521SJan Kara ret = submit_bh(write_op, bh); 1249*79feb521SJan Kara wait_on_buffer(bh); 1250914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1251914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1252914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1253*79feb521SJan Kara ret = -EIO; 1254*79feb521SJan Kara } 1255*79feb521SJan Kara if (ret) { 1256*79feb521SJan Kara printk(KERN_ERR "JBD2: Error %d detected when updating " 1257*79feb521SJan Kara "journal superblock for %s.\n", ret, 1258*79feb521SJan Kara journal->j_devname); 1259914258bfSTheodore Ts'o } 126024bcc89cSJan Kara } 1261470decc6SDave Kleikamp 126224bcc89cSJan Kara /** 126324bcc89cSJan Kara * jbd2_journal_update_sb_log_tail() - Update log tail in journal sb on disk. 126424bcc89cSJan Kara * @journal: The journal to update. 1265*79feb521SJan Kara * @tail_tid: TID of the new transaction at the tail of the log 1266*79feb521SJan Kara * @tail_block: The first block of the transaction at the tail of the log 1267*79feb521SJan Kara * @write_op: With which operation should we write the journal sb 126824bcc89cSJan Kara * 126924bcc89cSJan Kara * Update a journal's superblock information about log tail and write it to 127024bcc89cSJan Kara * disk, waiting for the IO to complete. 127124bcc89cSJan Kara */ 1272*79feb521SJan Kara void jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid, 1273*79feb521SJan Kara unsigned long tail_block, int write_op) 127424bcc89cSJan Kara { 127524bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 12762201c590SSeiji Aguchi 1277a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 1278*79feb521SJan Kara jbd_debug(1, "JBD2: updating superblock (start %lu, seq %u)\n", 1279*79feb521SJan Kara tail_block, tail_tid); 1280470decc6SDave Kleikamp 1281*79feb521SJan Kara sb->s_sequence = cpu_to_be32(tail_tid); 1282*79feb521SJan Kara sb->s_start = cpu_to_be32(tail_block); 128324bcc89cSJan Kara 1284*79feb521SJan Kara jbd2_write_superblock(journal, write_op); 128524bcc89cSJan Kara 128624bcc89cSJan Kara /* Log is no longer empty */ 1287a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 128824bcc89cSJan Kara WARN_ON(!sb->s_sequence); 1289f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_FLUSHED; 129024bcc89cSJan Kara write_unlock(&journal->j_state_lock); 129124bcc89cSJan Kara } 129224bcc89cSJan Kara 129324bcc89cSJan Kara /** 129424bcc89cSJan Kara * jbd2_mark_journal_empty() - Mark on disk journal as empty. 129524bcc89cSJan Kara * @journal: The journal to update. 129624bcc89cSJan Kara * 129724bcc89cSJan Kara * Update a journal's dynamic superblock fields to show that journal is empty. 129824bcc89cSJan Kara * Write updated superblock to disk waiting for IO to complete. 129924bcc89cSJan Kara */ 130024bcc89cSJan Kara static void jbd2_mark_journal_empty(journal_t *journal) 130124bcc89cSJan Kara { 130224bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 130324bcc89cSJan Kara 1304a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 130524bcc89cSJan Kara read_lock(&journal->j_state_lock); 130624bcc89cSJan Kara jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n", 130724bcc89cSJan Kara journal->j_tail_sequence); 130824bcc89cSJan Kara 130924bcc89cSJan Kara sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 131024bcc89cSJan Kara sb->s_start = cpu_to_be32(0); 131124bcc89cSJan Kara read_unlock(&journal->j_state_lock); 131224bcc89cSJan Kara 1313*79feb521SJan Kara jbd2_write_superblock(journal, WRITE_FUA); 131424bcc89cSJan Kara 131524bcc89cSJan Kara /* Log is no longer empty */ 131624bcc89cSJan Kara write_lock(&journal->j_state_lock); 1317f7f4bccbSMingming Cao journal->j_flags |= JBD2_FLUSHED; 1318a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1319470decc6SDave Kleikamp } 1320470decc6SDave Kleikamp 132124bcc89cSJan Kara 132224bcc89cSJan Kara /** 132324bcc89cSJan Kara * jbd2_journal_update_sb_errno() - Update error in the journal. 132424bcc89cSJan Kara * @journal: The journal to update. 132524bcc89cSJan Kara * 132624bcc89cSJan Kara * Update a journal's errno. Write updated superblock to disk waiting for IO 132724bcc89cSJan Kara * to complete. 132824bcc89cSJan Kara */ 132924bcc89cSJan Kara static void jbd2_journal_update_sb_errno(journal_t *journal) 133024bcc89cSJan Kara { 133124bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 133224bcc89cSJan Kara 133324bcc89cSJan Kara read_lock(&journal->j_state_lock); 133424bcc89cSJan Kara jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", 133524bcc89cSJan Kara journal->j_errno); 133624bcc89cSJan Kara sb->s_errno = cpu_to_be32(journal->j_errno); 133724bcc89cSJan Kara read_unlock(&journal->j_state_lock); 133824bcc89cSJan Kara 1339*79feb521SJan Kara jbd2_write_superblock(journal, WRITE_SYNC); 134024bcc89cSJan Kara } 134124bcc89cSJan Kara 1342470decc6SDave Kleikamp /* 1343470decc6SDave Kleikamp * Read the superblock for a given journal, performing initial 1344470decc6SDave Kleikamp * validation of the format. 1345470decc6SDave Kleikamp */ 1346470decc6SDave Kleikamp static int journal_get_superblock(journal_t *journal) 1347470decc6SDave Kleikamp { 1348470decc6SDave Kleikamp struct buffer_head *bh; 1349470decc6SDave Kleikamp journal_superblock_t *sb; 1350470decc6SDave Kleikamp int err = -EIO; 1351470decc6SDave Kleikamp 1352470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1353470decc6SDave Kleikamp 1354470decc6SDave Kleikamp J_ASSERT(bh != NULL); 1355470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1356470decc6SDave Kleikamp ll_rw_block(READ, 1, &bh); 1357470decc6SDave Kleikamp wait_on_buffer(bh); 1358470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1359470decc6SDave Kleikamp printk(KERN_ERR 1360f2a44523SEryu Guan "JBD2: IO error reading journal superblock\n"); 1361470decc6SDave Kleikamp goto out; 1362470decc6SDave Kleikamp } 1363470decc6SDave Kleikamp } 1364470decc6SDave Kleikamp 1365470decc6SDave Kleikamp sb = journal->j_superblock; 1366470decc6SDave Kleikamp 1367470decc6SDave Kleikamp err = -EINVAL; 1368470decc6SDave Kleikamp 1369f7f4bccbSMingming Cao if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || 1370470decc6SDave Kleikamp sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { 1371f2a44523SEryu Guan printk(KERN_WARNING "JBD2: no valid journal superblock found\n"); 1372470decc6SDave Kleikamp goto out; 1373470decc6SDave Kleikamp } 1374470decc6SDave Kleikamp 1375470decc6SDave Kleikamp switch(be32_to_cpu(sb->s_header.h_blocktype)) { 1376f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1377470decc6SDave Kleikamp journal->j_format_version = 1; 1378470decc6SDave Kleikamp break; 1379f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1380470decc6SDave Kleikamp journal->j_format_version = 2; 1381470decc6SDave Kleikamp break; 1382470decc6SDave Kleikamp default: 1383f2a44523SEryu Guan printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n"); 1384470decc6SDave Kleikamp goto out; 1385470decc6SDave Kleikamp } 1386470decc6SDave Kleikamp 1387470decc6SDave Kleikamp if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) 1388470decc6SDave Kleikamp journal->j_maxlen = be32_to_cpu(sb->s_maxlen); 1389470decc6SDave Kleikamp else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { 1390f2a44523SEryu Guan printk(KERN_WARNING "JBD2: journal file too short\n"); 1391470decc6SDave Kleikamp goto out; 1392470decc6SDave Kleikamp } 1393470decc6SDave Kleikamp 13948762202dSEryu Guan if (be32_to_cpu(sb->s_first) == 0 || 13958762202dSEryu Guan be32_to_cpu(sb->s_first) >= journal->j_maxlen) { 13968762202dSEryu Guan printk(KERN_WARNING 13978762202dSEryu Guan "JBD2: Invalid start block of journal: %u\n", 13988762202dSEryu Guan be32_to_cpu(sb->s_first)); 13998762202dSEryu Guan goto out; 14008762202dSEryu Guan } 14018762202dSEryu Guan 1402470decc6SDave Kleikamp return 0; 1403470decc6SDave Kleikamp 1404470decc6SDave Kleikamp out: 1405470decc6SDave Kleikamp journal_fail_superblock(journal); 1406470decc6SDave Kleikamp return err; 1407470decc6SDave Kleikamp } 1408470decc6SDave Kleikamp 1409470decc6SDave Kleikamp /* 1410470decc6SDave Kleikamp * Load the on-disk journal superblock and read the key fields into the 1411470decc6SDave Kleikamp * journal_t. 1412470decc6SDave Kleikamp */ 1413470decc6SDave Kleikamp 1414470decc6SDave Kleikamp static int load_superblock(journal_t *journal) 1415470decc6SDave Kleikamp { 1416470decc6SDave Kleikamp int err; 1417470decc6SDave Kleikamp journal_superblock_t *sb; 1418470decc6SDave Kleikamp 1419470decc6SDave Kleikamp err = journal_get_superblock(journal); 1420470decc6SDave Kleikamp if (err) 1421470decc6SDave Kleikamp return err; 1422470decc6SDave Kleikamp 1423470decc6SDave Kleikamp sb = journal->j_superblock; 1424470decc6SDave Kleikamp 1425470decc6SDave Kleikamp journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); 1426470decc6SDave Kleikamp journal->j_tail = be32_to_cpu(sb->s_start); 1427470decc6SDave Kleikamp journal->j_first = be32_to_cpu(sb->s_first); 1428470decc6SDave Kleikamp journal->j_last = be32_to_cpu(sb->s_maxlen); 1429470decc6SDave Kleikamp journal->j_errno = be32_to_cpu(sb->s_errno); 1430470decc6SDave Kleikamp 1431470decc6SDave Kleikamp return 0; 1432470decc6SDave Kleikamp } 1433470decc6SDave Kleikamp 1434470decc6SDave Kleikamp 1435470decc6SDave Kleikamp /** 1436f7f4bccbSMingming Cao * int jbd2_journal_load() - Read journal from disk. 1437470decc6SDave Kleikamp * @journal: Journal to act on. 1438470decc6SDave Kleikamp * 1439470decc6SDave Kleikamp * Given a journal_t structure which tells us which disk blocks contain 1440470decc6SDave Kleikamp * a journal, read the journal from disk to initialise the in-memory 1441470decc6SDave Kleikamp * structures. 1442470decc6SDave Kleikamp */ 1443f7f4bccbSMingming Cao int jbd2_journal_load(journal_t *journal) 1444470decc6SDave Kleikamp { 1445470decc6SDave Kleikamp int err; 1446470decc6SDave Kleikamp journal_superblock_t *sb; 1447470decc6SDave Kleikamp 1448470decc6SDave Kleikamp err = load_superblock(journal); 1449470decc6SDave Kleikamp if (err) 1450470decc6SDave Kleikamp return err; 1451470decc6SDave Kleikamp 1452470decc6SDave Kleikamp sb = journal->j_superblock; 1453470decc6SDave Kleikamp /* If this is a V2 superblock, then we have to check the 1454470decc6SDave Kleikamp * features flags on it. */ 1455470decc6SDave Kleikamp 1456470decc6SDave Kleikamp if (journal->j_format_version >= 2) { 1457470decc6SDave Kleikamp if ((sb->s_feature_ro_compat & 1458f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || 1459470decc6SDave Kleikamp (sb->s_feature_incompat & 1460f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { 1461470decc6SDave Kleikamp printk(KERN_WARNING 1462f2a44523SEryu Guan "JBD2: Unrecognised features on journal\n"); 1463470decc6SDave Kleikamp return -EINVAL; 1464470decc6SDave Kleikamp } 1465470decc6SDave Kleikamp } 1466470decc6SDave Kleikamp 1467d2eecb03STheodore Ts'o /* 1468d2eecb03STheodore Ts'o * Create a slab for this blocksize 1469d2eecb03STheodore Ts'o */ 1470d2eecb03STheodore Ts'o err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); 1471d2eecb03STheodore Ts'o if (err) 1472d2eecb03STheodore Ts'o return err; 1473d2eecb03STheodore Ts'o 1474470decc6SDave Kleikamp /* Let the recovery code check whether it needs to recover any 1475470decc6SDave Kleikamp * data from the journal. */ 1476f7f4bccbSMingming Cao if (jbd2_journal_recover(journal)) 1477470decc6SDave Kleikamp goto recovery_error; 1478470decc6SDave Kleikamp 1479e6a47428STheodore Ts'o if (journal->j_failed_commit) { 1480e6a47428STheodore Ts'o printk(KERN_ERR "JBD2: journal transaction %u on %s " 1481e6a47428STheodore Ts'o "is corrupt.\n", journal->j_failed_commit, 1482e6a47428STheodore Ts'o journal->j_devname); 1483e6a47428STheodore Ts'o return -EIO; 1484e6a47428STheodore Ts'o } 1485e6a47428STheodore Ts'o 1486470decc6SDave Kleikamp /* OK, we've finished with the dynamic journal bits: 1487470decc6SDave Kleikamp * reinitialise the dynamic contents of the superblock in memory 1488470decc6SDave Kleikamp * and reset them on disk. */ 1489470decc6SDave Kleikamp if (journal_reset(journal)) 1490470decc6SDave Kleikamp goto recovery_error; 1491470decc6SDave Kleikamp 1492f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_ABORT; 1493f7f4bccbSMingming Cao journal->j_flags |= JBD2_LOADED; 1494470decc6SDave Kleikamp return 0; 1495470decc6SDave Kleikamp 1496470decc6SDave Kleikamp recovery_error: 1497f2a44523SEryu Guan printk(KERN_WARNING "JBD2: recovery failed\n"); 1498470decc6SDave Kleikamp return -EIO; 1499470decc6SDave Kleikamp } 1500470decc6SDave Kleikamp 1501470decc6SDave Kleikamp /** 1502f7f4bccbSMingming Cao * void jbd2_journal_destroy() - Release a journal_t structure. 1503470decc6SDave Kleikamp * @journal: Journal to act on. 1504470decc6SDave Kleikamp * 1505470decc6SDave Kleikamp * Release a journal_t structure once it is no longer in use by the 1506470decc6SDave Kleikamp * journaled object. 150744519fafSHidehiro Kawai * Return <0 if we couldn't clean up the journal. 1508470decc6SDave Kleikamp */ 150944519fafSHidehiro Kawai int jbd2_journal_destroy(journal_t *journal) 1510470decc6SDave Kleikamp { 151144519fafSHidehiro Kawai int err = 0; 151244519fafSHidehiro Kawai 1513470decc6SDave Kleikamp /* Wait for the commit thread to wake up and die. */ 1514470decc6SDave Kleikamp journal_kill_thread(journal); 1515470decc6SDave Kleikamp 1516470decc6SDave Kleikamp /* Force a final log commit */ 1517470decc6SDave Kleikamp if (journal->j_running_transaction) 1518f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 1519470decc6SDave Kleikamp 1520470decc6SDave Kleikamp /* Force any old transactions to disk */ 1521470decc6SDave Kleikamp 1522470decc6SDave Kleikamp /* Totally anal locking here... */ 1523470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1524470decc6SDave Kleikamp while (journal->j_checkpoint_transactions != NULL) { 1525470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 15261a0d3786STheodore Ts'o mutex_lock(&journal->j_checkpoint_mutex); 1527f7f4bccbSMingming Cao jbd2_log_do_checkpoint(journal); 15281a0d3786STheodore Ts'o mutex_unlock(&journal->j_checkpoint_mutex); 1529470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1530470decc6SDave Kleikamp } 1531470decc6SDave Kleikamp 1532470decc6SDave Kleikamp J_ASSERT(journal->j_running_transaction == NULL); 1533470decc6SDave Kleikamp J_ASSERT(journal->j_committing_transaction == NULL); 1534470decc6SDave Kleikamp J_ASSERT(journal->j_checkpoint_transactions == NULL); 1535470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 1536470decc6SDave Kleikamp 153744519fafSHidehiro Kawai if (journal->j_sb_buffer) { 1538a78bb11dSJan Kara if (!is_journal_aborted(journal)) { 1539a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 154024bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1541a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1542a78bb11dSJan Kara } else 154344519fafSHidehiro Kawai err = -EIO; 1544470decc6SDave Kleikamp brelse(journal->j_sb_buffer); 1545470decc6SDave Kleikamp } 1546470decc6SDave Kleikamp 15478e85fb3fSJohann Lombardi if (journal->j_proc_entry) 15488e85fb3fSJohann Lombardi jbd2_stats_proc_exit(journal); 1549470decc6SDave Kleikamp if (journal->j_inode) 1550470decc6SDave Kleikamp iput(journal->j_inode); 1551470decc6SDave Kleikamp if (journal->j_revoke) 1552f7f4bccbSMingming Cao jbd2_journal_destroy_revoke(journal); 1553470decc6SDave Kleikamp kfree(journal->j_wbuf); 1554470decc6SDave Kleikamp kfree(journal); 155544519fafSHidehiro Kawai 155644519fafSHidehiro Kawai return err; 1557470decc6SDave Kleikamp } 1558470decc6SDave Kleikamp 1559470decc6SDave Kleikamp 1560470decc6SDave Kleikamp /** 1561f7f4bccbSMingming Cao *int jbd2_journal_check_used_features () - Check if features specified are used. 1562470decc6SDave Kleikamp * @journal: Journal to check. 1563470decc6SDave Kleikamp * @compat: bitmask of compatible features 1564470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1565470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1566470decc6SDave Kleikamp * 1567470decc6SDave Kleikamp * Check whether the journal uses all of a given set of 1568470decc6SDave Kleikamp * features. Return true (non-zero) if it does. 1569470decc6SDave Kleikamp **/ 1570470decc6SDave Kleikamp 1571f7f4bccbSMingming Cao int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, 1572470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1573470decc6SDave Kleikamp { 1574470decc6SDave Kleikamp journal_superblock_t *sb; 1575470decc6SDave Kleikamp 1576470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1577470decc6SDave Kleikamp return 1; 15781113e1b5SPatrick J. LoPresti /* Load journal superblock if it is not loaded yet. */ 15791113e1b5SPatrick J. LoPresti if (journal->j_format_version == 0 && 15801113e1b5SPatrick J. LoPresti journal_get_superblock(journal) != 0) 15811113e1b5SPatrick J. LoPresti return 0; 1582470decc6SDave Kleikamp if (journal->j_format_version == 1) 1583470decc6SDave Kleikamp return 0; 1584470decc6SDave Kleikamp 1585470decc6SDave Kleikamp sb = journal->j_superblock; 1586470decc6SDave Kleikamp 1587470decc6SDave Kleikamp if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && 1588470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && 1589470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) 1590470decc6SDave Kleikamp return 1; 1591470decc6SDave Kleikamp 1592470decc6SDave Kleikamp return 0; 1593470decc6SDave Kleikamp } 1594470decc6SDave Kleikamp 1595470decc6SDave Kleikamp /** 1596f7f4bccbSMingming Cao * int jbd2_journal_check_available_features() - Check feature set in journalling layer 1597470decc6SDave Kleikamp * @journal: Journal to check. 1598470decc6SDave Kleikamp * @compat: bitmask of compatible features 1599470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1600470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1601470decc6SDave Kleikamp * 1602470decc6SDave Kleikamp * Check whether the journaling code supports the use of 1603470decc6SDave Kleikamp * all of a given set of features on this journal. Return true 1604470decc6SDave Kleikamp * (non-zero) if it can. */ 1605470decc6SDave Kleikamp 1606f7f4bccbSMingming Cao int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, 1607470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1608470decc6SDave Kleikamp { 1609470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1610470decc6SDave Kleikamp return 1; 1611470decc6SDave Kleikamp 1612470decc6SDave Kleikamp /* We can support any known requested features iff the 1613470decc6SDave Kleikamp * superblock is in version 2. Otherwise we fail to support any 1614470decc6SDave Kleikamp * extended sb features. */ 1615470decc6SDave Kleikamp 1616470decc6SDave Kleikamp if (journal->j_format_version != 2) 1617470decc6SDave Kleikamp return 0; 1618470decc6SDave Kleikamp 1619f7f4bccbSMingming Cao if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && 1620f7f4bccbSMingming Cao (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && 1621f7f4bccbSMingming Cao (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) 1622470decc6SDave Kleikamp return 1; 1623470decc6SDave Kleikamp 1624470decc6SDave Kleikamp return 0; 1625470decc6SDave Kleikamp } 1626470decc6SDave Kleikamp 1627470decc6SDave Kleikamp /** 1628f7f4bccbSMingming Cao * int jbd2_journal_set_features () - Mark a given journal feature in the superblock 1629470decc6SDave Kleikamp * @journal: Journal to act on. 1630470decc6SDave Kleikamp * @compat: bitmask of compatible features 1631470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1632470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1633470decc6SDave Kleikamp * 1634470decc6SDave Kleikamp * Mark a given journal feature as present on the 1635470decc6SDave Kleikamp * superblock. Returns true if the requested features could be set. 1636470decc6SDave Kleikamp * 1637470decc6SDave Kleikamp */ 1638470decc6SDave Kleikamp 1639f7f4bccbSMingming Cao int jbd2_journal_set_features (journal_t *journal, unsigned long compat, 1640470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1641470decc6SDave Kleikamp { 1642470decc6SDave Kleikamp journal_superblock_t *sb; 1643470decc6SDave Kleikamp 1644f7f4bccbSMingming Cao if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) 1645470decc6SDave Kleikamp return 1; 1646470decc6SDave Kleikamp 1647f7f4bccbSMingming Cao if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) 1648470decc6SDave Kleikamp return 0; 1649470decc6SDave Kleikamp 1650470decc6SDave Kleikamp jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", 1651470decc6SDave Kleikamp compat, ro, incompat); 1652470decc6SDave Kleikamp 1653470decc6SDave Kleikamp sb = journal->j_superblock; 1654470decc6SDave Kleikamp 1655470decc6SDave Kleikamp sb->s_feature_compat |= cpu_to_be32(compat); 1656470decc6SDave Kleikamp sb->s_feature_ro_compat |= cpu_to_be32(ro); 1657470decc6SDave Kleikamp sb->s_feature_incompat |= cpu_to_be32(incompat); 1658470decc6SDave Kleikamp 1659470decc6SDave Kleikamp return 1; 1660470decc6SDave Kleikamp } 1661470decc6SDave Kleikamp 1662818d276cSGirish Shilamkar /* 1663818d276cSGirish Shilamkar * jbd2_journal_clear_features () - Clear a given journal feature in the 1664818d276cSGirish Shilamkar * superblock 1665818d276cSGirish Shilamkar * @journal: Journal to act on. 1666818d276cSGirish Shilamkar * @compat: bitmask of compatible features 1667818d276cSGirish Shilamkar * @ro: bitmask of features that force read-only mount 1668818d276cSGirish Shilamkar * @incompat: bitmask of incompatible features 1669818d276cSGirish Shilamkar * 1670818d276cSGirish Shilamkar * Clear a given journal feature as present on the 1671818d276cSGirish Shilamkar * superblock. 1672818d276cSGirish Shilamkar */ 1673818d276cSGirish Shilamkar void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, 1674818d276cSGirish Shilamkar unsigned long ro, unsigned long incompat) 1675818d276cSGirish Shilamkar { 1676818d276cSGirish Shilamkar journal_superblock_t *sb; 1677818d276cSGirish Shilamkar 1678818d276cSGirish Shilamkar jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", 1679818d276cSGirish Shilamkar compat, ro, incompat); 1680818d276cSGirish Shilamkar 1681818d276cSGirish Shilamkar sb = journal->j_superblock; 1682818d276cSGirish Shilamkar 1683818d276cSGirish Shilamkar sb->s_feature_compat &= ~cpu_to_be32(compat); 1684818d276cSGirish Shilamkar sb->s_feature_ro_compat &= ~cpu_to_be32(ro); 1685818d276cSGirish Shilamkar sb->s_feature_incompat &= ~cpu_to_be32(incompat); 1686818d276cSGirish Shilamkar } 1687818d276cSGirish Shilamkar EXPORT_SYMBOL(jbd2_journal_clear_features); 1688470decc6SDave Kleikamp 1689470decc6SDave Kleikamp /** 1690f7f4bccbSMingming Cao * int jbd2_journal_flush () - Flush journal 1691470decc6SDave Kleikamp * @journal: Journal to act on. 1692470decc6SDave Kleikamp * 1693470decc6SDave Kleikamp * Flush all data for a given journal to disk and empty the journal. 1694470decc6SDave Kleikamp * Filesystems can use this when remounting readonly to ensure that 1695470decc6SDave Kleikamp * recovery does not need to happen on remount. 1696470decc6SDave Kleikamp */ 1697470decc6SDave Kleikamp 1698f7f4bccbSMingming Cao int jbd2_journal_flush(journal_t *journal) 1699470decc6SDave Kleikamp { 1700470decc6SDave Kleikamp int err = 0; 1701470decc6SDave Kleikamp transaction_t *transaction = NULL; 1702470decc6SDave Kleikamp 1703a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1704470decc6SDave Kleikamp 1705470decc6SDave Kleikamp /* Force everything buffered to the log... */ 1706470decc6SDave Kleikamp if (journal->j_running_transaction) { 1707470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1708f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1709470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 1710470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 1711470decc6SDave Kleikamp 1712470decc6SDave Kleikamp /* Wait for the log commit to complete... */ 1713470decc6SDave Kleikamp if (transaction) { 1714470decc6SDave Kleikamp tid_t tid = transaction->t_tid; 1715470decc6SDave Kleikamp 1716a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1717f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 1718470decc6SDave Kleikamp } else { 1719a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1720470decc6SDave Kleikamp } 1721470decc6SDave Kleikamp 1722470decc6SDave Kleikamp /* ...and flush everything in the log out to disk. */ 1723470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1724470decc6SDave Kleikamp while (!err && journal->j_checkpoint_transactions != NULL) { 1725470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 172644519fafSHidehiro Kawai mutex_lock(&journal->j_checkpoint_mutex); 1727f7f4bccbSMingming Cao err = jbd2_log_do_checkpoint(journal); 172844519fafSHidehiro Kawai mutex_unlock(&journal->j_checkpoint_mutex); 1729470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1730470decc6SDave Kleikamp } 1731470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 173244519fafSHidehiro Kawai 173344519fafSHidehiro Kawai if (is_journal_aborted(journal)) 173444519fafSHidehiro Kawai return -EIO; 173544519fafSHidehiro Kawai 1736a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 1737f7f4bccbSMingming Cao jbd2_cleanup_journal_tail(journal); 1738470decc6SDave Kleikamp 1739470decc6SDave Kleikamp /* Finally, mark the journal as really needing no recovery. 1740470decc6SDave Kleikamp * This sets s_start==0 in the underlying superblock, which is 1741470decc6SDave Kleikamp * the magic code for a fully-recovered superblock. Any future 1742470decc6SDave Kleikamp * commits of data to the journal will restore the current 1743470decc6SDave Kleikamp * s_start value. */ 174424bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1745a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1746a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1747470decc6SDave Kleikamp J_ASSERT(!journal->j_running_transaction); 1748470decc6SDave Kleikamp J_ASSERT(!journal->j_committing_transaction); 1749470decc6SDave Kleikamp J_ASSERT(!journal->j_checkpoint_transactions); 1750470decc6SDave Kleikamp J_ASSERT(journal->j_head == journal->j_tail); 1751470decc6SDave Kleikamp J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); 1752a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 175344519fafSHidehiro Kawai return 0; 1754470decc6SDave Kleikamp } 1755470decc6SDave Kleikamp 1756470decc6SDave Kleikamp /** 1757f7f4bccbSMingming Cao * int jbd2_journal_wipe() - Wipe journal contents 1758470decc6SDave Kleikamp * @journal: Journal to act on. 1759470decc6SDave Kleikamp * @write: flag (see below) 1760470decc6SDave Kleikamp * 1761470decc6SDave Kleikamp * Wipe out all of the contents of a journal, safely. This will produce 1762470decc6SDave Kleikamp * a warning if the journal contains any valid recovery information. 1763f7f4bccbSMingming Cao * Must be called between journal_init_*() and jbd2_journal_load(). 1764470decc6SDave Kleikamp * 1765470decc6SDave Kleikamp * If 'write' is non-zero, then we wipe out the journal on disk; otherwise 1766470decc6SDave Kleikamp * we merely suppress recovery. 1767470decc6SDave Kleikamp */ 1768470decc6SDave Kleikamp 1769f7f4bccbSMingming Cao int jbd2_journal_wipe(journal_t *journal, int write) 1770470decc6SDave Kleikamp { 1771470decc6SDave Kleikamp int err = 0; 1772470decc6SDave Kleikamp 1773f7f4bccbSMingming Cao J_ASSERT (!(journal->j_flags & JBD2_LOADED)); 1774470decc6SDave Kleikamp 1775470decc6SDave Kleikamp err = load_superblock(journal); 1776470decc6SDave Kleikamp if (err) 1777470decc6SDave Kleikamp return err; 1778470decc6SDave Kleikamp 1779470decc6SDave Kleikamp if (!journal->j_tail) 1780470decc6SDave Kleikamp goto no_recovery; 1781470decc6SDave Kleikamp 1782f2a44523SEryu Guan printk(KERN_WARNING "JBD2: %s recovery information on journal\n", 1783470decc6SDave Kleikamp write ? "Clearing" : "Ignoring"); 1784470decc6SDave Kleikamp 1785f7f4bccbSMingming Cao err = jbd2_journal_skip_recovery(journal); 1786a78bb11dSJan Kara if (write) { 1787a78bb11dSJan Kara /* Lock to make assertions happy... */ 1788a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 178924bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1790a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1791a78bb11dSJan Kara } 1792470decc6SDave Kleikamp 1793470decc6SDave Kleikamp no_recovery: 1794470decc6SDave Kleikamp return err; 1795470decc6SDave Kleikamp } 1796470decc6SDave Kleikamp 1797470decc6SDave Kleikamp /* 1798470decc6SDave Kleikamp * Journal abort has very specific semantics, which we describe 1799470decc6SDave Kleikamp * for journal abort. 1800470decc6SDave Kleikamp * 1801bfcd3555SAlberto Bertogli * Two internal functions, which provide abort to the jbd layer 1802470decc6SDave Kleikamp * itself are here. 1803470decc6SDave Kleikamp */ 1804470decc6SDave Kleikamp 1805470decc6SDave Kleikamp /* 1806470decc6SDave Kleikamp * Quick version for internal journal use (doesn't lock the journal). 1807470decc6SDave Kleikamp * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, 1808470decc6SDave Kleikamp * and don't attempt to make any other journal updates. 1809470decc6SDave Kleikamp */ 1810f7f4bccbSMingming Cao void __jbd2_journal_abort_hard(journal_t *journal) 1811470decc6SDave Kleikamp { 1812470decc6SDave Kleikamp transaction_t *transaction; 1813470decc6SDave Kleikamp 1814f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1815470decc6SDave Kleikamp return; 1816470decc6SDave Kleikamp 1817470decc6SDave Kleikamp printk(KERN_ERR "Aborting journal on device %s.\n", 181805496769STheodore Ts'o journal->j_devname); 1819470decc6SDave Kleikamp 1820a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1821f7f4bccbSMingming Cao journal->j_flags |= JBD2_ABORT; 1822470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1823470decc6SDave Kleikamp if (transaction) 1824f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1825a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1826470decc6SDave Kleikamp } 1827470decc6SDave Kleikamp 1828470decc6SDave Kleikamp /* Soft abort: record the abort error status in the journal superblock, 1829470decc6SDave Kleikamp * but don't do any other IO. */ 1830470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno) 1831470decc6SDave Kleikamp { 1832f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1833470decc6SDave Kleikamp return; 1834470decc6SDave Kleikamp 1835470decc6SDave Kleikamp if (!journal->j_errno) 1836470decc6SDave Kleikamp journal->j_errno = errno; 1837470decc6SDave Kleikamp 1838f7f4bccbSMingming Cao __jbd2_journal_abort_hard(journal); 1839470decc6SDave Kleikamp 1840470decc6SDave Kleikamp if (errno) 184124bcc89cSJan Kara jbd2_journal_update_sb_errno(journal); 1842470decc6SDave Kleikamp } 1843470decc6SDave Kleikamp 1844470decc6SDave Kleikamp /** 1845f7f4bccbSMingming Cao * void jbd2_journal_abort () - Shutdown the journal immediately. 1846470decc6SDave Kleikamp * @journal: the journal to shutdown. 1847470decc6SDave Kleikamp * @errno: an error number to record in the journal indicating 1848470decc6SDave Kleikamp * the reason for the shutdown. 1849470decc6SDave Kleikamp * 1850470decc6SDave Kleikamp * Perform a complete, immediate shutdown of the ENTIRE 1851470decc6SDave Kleikamp * journal (not of a single transaction). This operation cannot be 1852470decc6SDave Kleikamp * undone without closing and reopening the journal. 1853470decc6SDave Kleikamp * 1854f7f4bccbSMingming Cao * The jbd2_journal_abort function is intended to support higher level error 1855470decc6SDave Kleikamp * recovery mechanisms such as the ext2/ext3 remount-readonly error 1856470decc6SDave Kleikamp * mode. 1857470decc6SDave Kleikamp * 1858470decc6SDave Kleikamp * Journal abort has very specific semantics. Any existing dirty, 1859470decc6SDave Kleikamp * unjournaled buffers in the main filesystem will still be written to 1860470decc6SDave Kleikamp * disk by bdflush, but the journaling mechanism will be suspended 1861470decc6SDave Kleikamp * immediately and no further transaction commits will be honoured. 1862470decc6SDave Kleikamp * 1863470decc6SDave Kleikamp * Any dirty, journaled buffers will be written back to disk without 1864470decc6SDave Kleikamp * hitting the journal. Atomicity cannot be guaranteed on an aborted 1865470decc6SDave Kleikamp * filesystem, but we _do_ attempt to leave as much data as possible 1866470decc6SDave Kleikamp * behind for fsck to use for cleanup. 1867470decc6SDave Kleikamp * 1868470decc6SDave Kleikamp * Any attempt to get a new transaction handle on a journal which is in 1869470decc6SDave Kleikamp * ABORT state will just result in an -EROFS error return. A 1870f7f4bccbSMingming Cao * jbd2_journal_stop on an existing handle will return -EIO if we have 1871470decc6SDave Kleikamp * entered abort state during the update. 1872470decc6SDave Kleikamp * 1873470decc6SDave Kleikamp * Recursive transactions are not disturbed by journal abort until the 1874f7f4bccbSMingming Cao * final jbd2_journal_stop, which will receive the -EIO error. 1875470decc6SDave Kleikamp * 1876f7f4bccbSMingming Cao * Finally, the jbd2_journal_abort call allows the caller to supply an errno 1877470decc6SDave Kleikamp * which will be recorded (if possible) in the journal superblock. This 1878470decc6SDave Kleikamp * allows a client to record failure conditions in the middle of a 1879470decc6SDave Kleikamp * transaction without having to complete the transaction to record the 1880470decc6SDave Kleikamp * failure to disk. ext3_error, for example, now uses this 1881470decc6SDave Kleikamp * functionality. 1882470decc6SDave Kleikamp * 1883470decc6SDave Kleikamp * Errors which originate from within the journaling layer will NOT 1884470decc6SDave Kleikamp * supply an errno; a null errno implies that absolutely no further 1885470decc6SDave Kleikamp * writes are done to the journal (unless there are any already in 1886470decc6SDave Kleikamp * progress). 1887470decc6SDave Kleikamp * 1888470decc6SDave Kleikamp */ 1889470decc6SDave Kleikamp 1890f7f4bccbSMingming Cao void jbd2_journal_abort(journal_t *journal, int errno) 1891470decc6SDave Kleikamp { 1892470decc6SDave Kleikamp __journal_abort_soft(journal, errno); 1893470decc6SDave Kleikamp } 1894470decc6SDave Kleikamp 1895470decc6SDave Kleikamp /** 1896f7f4bccbSMingming Cao * int jbd2_journal_errno () - returns the journal's error state. 1897470decc6SDave Kleikamp * @journal: journal to examine. 1898470decc6SDave Kleikamp * 1899bfcd3555SAlberto Bertogli * This is the errno number set with jbd2_journal_abort(), the last 1900470decc6SDave Kleikamp * time the journal was mounted - if the journal was stopped 1901470decc6SDave Kleikamp * without calling abort this will be 0. 1902470decc6SDave Kleikamp * 1903470decc6SDave Kleikamp * If the journal has been aborted on this mount time -EROFS will 1904470decc6SDave Kleikamp * be returned. 1905470decc6SDave Kleikamp */ 1906f7f4bccbSMingming Cao int jbd2_journal_errno(journal_t *journal) 1907470decc6SDave Kleikamp { 1908470decc6SDave Kleikamp int err; 1909470decc6SDave Kleikamp 1910a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 1911f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1912470decc6SDave Kleikamp err = -EROFS; 1913470decc6SDave Kleikamp else 1914470decc6SDave Kleikamp err = journal->j_errno; 1915a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 1916470decc6SDave Kleikamp return err; 1917470decc6SDave Kleikamp } 1918470decc6SDave Kleikamp 1919470decc6SDave Kleikamp /** 1920f7f4bccbSMingming Cao * int jbd2_journal_clear_err () - clears the journal's error state 1921470decc6SDave Kleikamp * @journal: journal to act on. 1922470decc6SDave Kleikamp * 1923bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 1924470decc6SDave Kleikamp * mode. 1925470decc6SDave Kleikamp */ 1926f7f4bccbSMingming Cao int jbd2_journal_clear_err(journal_t *journal) 1927470decc6SDave Kleikamp { 1928470decc6SDave Kleikamp int err = 0; 1929470decc6SDave Kleikamp 1930a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1931f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1932470decc6SDave Kleikamp err = -EROFS; 1933470decc6SDave Kleikamp else 1934470decc6SDave Kleikamp journal->j_errno = 0; 1935a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1936470decc6SDave Kleikamp return err; 1937470decc6SDave Kleikamp } 1938470decc6SDave Kleikamp 1939470decc6SDave Kleikamp /** 1940f7f4bccbSMingming Cao * void jbd2_journal_ack_err() - Ack journal err. 1941470decc6SDave Kleikamp * @journal: journal to act on. 1942470decc6SDave Kleikamp * 1943bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 1944470decc6SDave Kleikamp * mode. 1945470decc6SDave Kleikamp */ 1946f7f4bccbSMingming Cao void jbd2_journal_ack_err(journal_t *journal) 1947470decc6SDave Kleikamp { 1948a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1949470decc6SDave Kleikamp if (journal->j_errno) 1950f7f4bccbSMingming Cao journal->j_flags |= JBD2_ACK_ERR; 1951a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1952470decc6SDave Kleikamp } 1953470decc6SDave Kleikamp 1954f7f4bccbSMingming Cao int jbd2_journal_blocks_per_page(struct inode *inode) 1955470decc6SDave Kleikamp { 1956470decc6SDave Kleikamp return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 1957470decc6SDave Kleikamp } 1958470decc6SDave Kleikamp 1959470decc6SDave Kleikamp /* 1960b517bea1SZach Brown * helper functions to deal with 32 or 64bit block numbers. 1961b517bea1SZach Brown */ 1962b517bea1SZach Brown size_t journal_tag_bytes(journal_t *journal) 1963b517bea1SZach Brown { 1964b517bea1SZach Brown if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) 1965cd02ff0bSMingming Cao return JBD2_TAG_SIZE64; 1966b517bea1SZach Brown else 1967cd02ff0bSMingming Cao return JBD2_TAG_SIZE32; 1968b517bea1SZach Brown } 1969b517bea1SZach Brown 1970b517bea1SZach Brown /* 1971d2eecb03STheodore Ts'o * JBD memory management 1972d2eecb03STheodore Ts'o * 1973d2eecb03STheodore Ts'o * These functions are used to allocate block-sized chunks of memory 1974d2eecb03STheodore Ts'o * used for making copies of buffer_head data. Very often it will be 1975d2eecb03STheodore Ts'o * page-sized chunks of data, but sometimes it will be in 1976d2eecb03STheodore Ts'o * sub-page-size chunks. (For example, 16k pages on Power systems 1977d2eecb03STheodore Ts'o * with a 4k block file system.) For blocks smaller than a page, we 1978d2eecb03STheodore Ts'o * use a SLAB allocator. There are slab caches for each block size, 1979d2eecb03STheodore Ts'o * which are allocated at mount time, if necessary, and we only free 1980d2eecb03STheodore Ts'o * (all of) the slab caches when/if the jbd2 module is unloaded. For 1981d2eecb03STheodore Ts'o * this reason we don't need to a mutex to protect access to 1982d2eecb03STheodore Ts'o * jbd2_slab[] allocating or releasing memory; only in 1983d2eecb03STheodore Ts'o * jbd2_journal_create_slab(). 1984d2eecb03STheodore Ts'o */ 1985d2eecb03STheodore Ts'o #define JBD2_MAX_SLABS 8 1986d2eecb03STheodore Ts'o static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; 1987d2eecb03STheodore Ts'o 1988d2eecb03STheodore Ts'o static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { 1989d2eecb03STheodore Ts'o "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", 1990d2eecb03STheodore Ts'o "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" 1991d2eecb03STheodore Ts'o }; 1992d2eecb03STheodore Ts'o 1993d2eecb03STheodore Ts'o 1994d2eecb03STheodore Ts'o static void jbd2_journal_destroy_slabs(void) 1995d2eecb03STheodore Ts'o { 1996d2eecb03STheodore Ts'o int i; 1997d2eecb03STheodore Ts'o 1998d2eecb03STheodore Ts'o for (i = 0; i < JBD2_MAX_SLABS; i++) { 1999d2eecb03STheodore Ts'o if (jbd2_slab[i]) 2000d2eecb03STheodore Ts'o kmem_cache_destroy(jbd2_slab[i]); 2001d2eecb03STheodore Ts'o jbd2_slab[i] = NULL; 2002d2eecb03STheodore Ts'o } 2003d2eecb03STheodore Ts'o } 2004d2eecb03STheodore Ts'o 2005d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t size) 2006d2eecb03STheodore Ts'o { 200751dfacdeSThomas Gleixner static DEFINE_MUTEX(jbd2_slab_create_mutex); 2008d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2009d2eecb03STheodore Ts'o size_t slab_size; 2010d2eecb03STheodore Ts'o 2011d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2012d2eecb03STheodore Ts'o return 0; 2013d2eecb03STheodore Ts'o 2014d2eecb03STheodore Ts'o if (i >= JBD2_MAX_SLABS) 2015d2eecb03STheodore Ts'o return -EINVAL; 2016d2eecb03STheodore Ts'o 2017d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2018d2eecb03STheodore Ts'o i = 0; 201951dfacdeSThomas Gleixner mutex_lock(&jbd2_slab_create_mutex); 2020d2eecb03STheodore Ts'o if (jbd2_slab[i]) { 202151dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2022d2eecb03STheodore Ts'o return 0; /* Already created */ 2023d2eecb03STheodore Ts'o } 2024d2eecb03STheodore Ts'o 2025d2eecb03STheodore Ts'o slab_size = 1 << (i+10); 2026d2eecb03STheodore Ts'o jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, 2027d2eecb03STheodore Ts'o slab_size, 0, NULL); 202851dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2029d2eecb03STheodore Ts'o if (!jbd2_slab[i]) { 2030d2eecb03STheodore Ts'o printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); 2031d2eecb03STheodore Ts'o return -ENOMEM; 2032d2eecb03STheodore Ts'o } 2033d2eecb03STheodore Ts'o return 0; 2034d2eecb03STheodore Ts'o } 2035d2eecb03STheodore Ts'o 2036d2eecb03STheodore Ts'o static struct kmem_cache *get_slab(size_t size) 2037d2eecb03STheodore Ts'o { 2038d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2039d2eecb03STheodore Ts'o 2040d2eecb03STheodore Ts'o BUG_ON(i >= JBD2_MAX_SLABS); 2041d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2042d2eecb03STheodore Ts'o i = 0; 20438ac97b74SBill Pemberton BUG_ON(jbd2_slab[i] == NULL); 2044d2eecb03STheodore Ts'o return jbd2_slab[i]; 2045d2eecb03STheodore Ts'o } 2046d2eecb03STheodore Ts'o 2047d2eecb03STheodore Ts'o void *jbd2_alloc(size_t size, gfp_t flags) 2048d2eecb03STheodore Ts'o { 2049d2eecb03STheodore Ts'o void *ptr; 2050d2eecb03STheodore Ts'o 2051d2eecb03STheodore Ts'o BUG_ON(size & (size-1)); /* Must be a power of 2 */ 2052d2eecb03STheodore Ts'o 2053d2eecb03STheodore Ts'o flags |= __GFP_REPEAT; 2054d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2055d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, 0); 2056d2eecb03STheodore Ts'o else if (size > PAGE_SIZE) { 2057d2eecb03STheodore Ts'o int order = get_order(size); 2058d2eecb03STheodore Ts'o 2059d2eecb03STheodore Ts'o if (order < 3) 2060d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, order); 2061d2eecb03STheodore Ts'o else 2062d2eecb03STheodore Ts'o ptr = vmalloc(size); 2063d2eecb03STheodore Ts'o } else 2064d2eecb03STheodore Ts'o ptr = kmem_cache_alloc(get_slab(size), flags); 2065d2eecb03STheodore Ts'o 2066d2eecb03STheodore Ts'o /* Check alignment; SLUB has gotten this wrong in the past, 2067d2eecb03STheodore Ts'o * and this can lead to user data corruption! */ 2068d2eecb03STheodore Ts'o BUG_ON(((unsigned long) ptr) & (size-1)); 2069d2eecb03STheodore Ts'o 2070d2eecb03STheodore Ts'o return ptr; 2071d2eecb03STheodore Ts'o } 2072d2eecb03STheodore Ts'o 2073d2eecb03STheodore Ts'o void jbd2_free(void *ptr, size_t size) 2074d2eecb03STheodore Ts'o { 2075d2eecb03STheodore Ts'o if (size == PAGE_SIZE) { 2076d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, 0); 2077d2eecb03STheodore Ts'o return; 2078d2eecb03STheodore Ts'o } 2079d2eecb03STheodore Ts'o if (size > PAGE_SIZE) { 2080d2eecb03STheodore Ts'o int order = get_order(size); 2081d2eecb03STheodore Ts'o 2082d2eecb03STheodore Ts'o if (order < 3) 2083d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, order); 2084d2eecb03STheodore Ts'o else 2085d2eecb03STheodore Ts'o vfree(ptr); 2086d2eecb03STheodore Ts'o return; 2087d2eecb03STheodore Ts'o } 2088d2eecb03STheodore Ts'o kmem_cache_free(get_slab(size), ptr); 2089d2eecb03STheodore Ts'o }; 2090d2eecb03STheodore Ts'o 2091d2eecb03STheodore Ts'o /* 2092470decc6SDave Kleikamp * Journal_head storage management 2093470decc6SDave Kleikamp */ 2094e18b890bSChristoph Lameter static struct kmem_cache *jbd2_journal_head_cache; 2095e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2096470decc6SDave Kleikamp static atomic_t nr_journal_heads = ATOMIC_INIT(0); 2097470decc6SDave Kleikamp #endif 2098470decc6SDave Kleikamp 20994185a2acSYongqiang Yang static int jbd2_journal_init_journal_head_cache(void) 2100470decc6SDave Kleikamp { 2101470decc6SDave Kleikamp int retval; 2102470decc6SDave Kleikamp 21031076d17aSAl Viro J_ASSERT(jbd2_journal_head_cache == NULL); 2104a920e941SJohann Lombardi jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", 2105470decc6SDave Kleikamp sizeof(struct journal_head), 2106470decc6SDave Kleikamp 0, /* offset */ 210777160957SMingming Cao SLAB_TEMPORARY, /* flags */ 210820c2df83SPaul Mundt NULL); /* ctor */ 2109470decc6SDave Kleikamp retval = 0; 21101076d17aSAl Viro if (!jbd2_journal_head_cache) { 2111470decc6SDave Kleikamp retval = -ENOMEM; 2112f2a44523SEryu Guan printk(KERN_EMERG "JBD2: no memory for journal_head cache\n"); 2113470decc6SDave Kleikamp } 2114470decc6SDave Kleikamp return retval; 2115470decc6SDave Kleikamp } 2116470decc6SDave Kleikamp 21174185a2acSYongqiang Yang static void jbd2_journal_destroy_journal_head_cache(void) 2118470decc6SDave Kleikamp { 21198a9362ebSDuane Griffin if (jbd2_journal_head_cache) { 2120f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_journal_head_cache); 2121f7f4bccbSMingming Cao jbd2_journal_head_cache = NULL; 2122470decc6SDave Kleikamp } 21238a9362ebSDuane Griffin } 2124470decc6SDave Kleikamp 2125470decc6SDave Kleikamp /* 2126470decc6SDave Kleikamp * journal_head splicing and dicing 2127470decc6SDave Kleikamp */ 2128470decc6SDave Kleikamp static struct journal_head *journal_alloc_journal_head(void) 2129470decc6SDave Kleikamp { 2130470decc6SDave Kleikamp struct journal_head *ret; 2131470decc6SDave Kleikamp 2132e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2133470decc6SDave Kleikamp atomic_inc(&nr_journal_heads); 2134470decc6SDave Kleikamp #endif 2135f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 21361076d17aSAl Viro if (!ret) { 2137470decc6SDave Kleikamp jbd_debug(1, "out of memory for journal_head\n"); 2138670be5a7STheodore Ts'o pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__); 21391076d17aSAl Viro while (!ret) { 2140470decc6SDave Kleikamp yield(); 2141f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 2142470decc6SDave Kleikamp } 2143470decc6SDave Kleikamp } 2144470decc6SDave Kleikamp return ret; 2145470decc6SDave Kleikamp } 2146470decc6SDave Kleikamp 2147470decc6SDave Kleikamp static void journal_free_journal_head(struct journal_head *jh) 2148470decc6SDave Kleikamp { 2149e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2150470decc6SDave Kleikamp atomic_dec(&nr_journal_heads); 2151cd02ff0bSMingming Cao memset(jh, JBD2_POISON_FREE, sizeof(*jh)); 2152470decc6SDave Kleikamp #endif 2153f7f4bccbSMingming Cao kmem_cache_free(jbd2_journal_head_cache, jh); 2154470decc6SDave Kleikamp } 2155470decc6SDave Kleikamp 2156470decc6SDave Kleikamp /* 2157470decc6SDave Kleikamp * A journal_head is attached to a buffer_head whenever JBD has an 2158470decc6SDave Kleikamp * interest in the buffer. 2159470decc6SDave Kleikamp * 2160470decc6SDave Kleikamp * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit 2161470decc6SDave Kleikamp * is set. This bit is tested in core kernel code where we need to take 2162470decc6SDave Kleikamp * JBD-specific actions. Testing the zeroness of ->b_private is not reliable 2163470decc6SDave Kleikamp * there. 2164470decc6SDave Kleikamp * 2165470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. 2166470decc6SDave Kleikamp * 2167470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set it is immune from being released by 2168470decc6SDave Kleikamp * core kernel code, mainly via ->b_count. 2169470decc6SDave Kleikamp * 2170de1b7941SJan Kara * A journal_head is detached from its buffer_head when the journal_head's 2171de1b7941SJan Kara * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint 2172de1b7941SJan Kara * transaction (b_cp_transaction) hold their references to b_jcount. 2173470decc6SDave Kleikamp * 2174470decc6SDave Kleikamp * Various places in the kernel want to attach a journal_head to a buffer_head 2175470decc6SDave Kleikamp * _before_ attaching the journal_head to a transaction. To protect the 2176f7f4bccbSMingming Cao * journal_head in this situation, jbd2_journal_add_journal_head elevates the 2177470decc6SDave Kleikamp * journal_head's b_jcount refcount by one. The caller must call 2178f7f4bccbSMingming Cao * jbd2_journal_put_journal_head() to undo this. 2179470decc6SDave Kleikamp * 2180470decc6SDave Kleikamp * So the typical usage would be: 2181470decc6SDave Kleikamp * 2182470decc6SDave Kleikamp * (Attach a journal_head if needed. Increments b_jcount) 2183f7f4bccbSMingming Cao * struct journal_head *jh = jbd2_journal_add_journal_head(bh); 2184470decc6SDave Kleikamp * ... 2185de1b7941SJan Kara * (Get another reference for transaction) 2186de1b7941SJan Kara * jbd2_journal_grab_journal_head(bh); 2187470decc6SDave Kleikamp * jh->b_transaction = xxx; 2188de1b7941SJan Kara * (Put original reference) 2189f7f4bccbSMingming Cao * jbd2_journal_put_journal_head(jh); 2190470decc6SDave Kleikamp */ 2191470decc6SDave Kleikamp 2192470decc6SDave Kleikamp /* 2193470decc6SDave Kleikamp * Give a buffer_head a journal_head. 2194470decc6SDave Kleikamp * 2195470decc6SDave Kleikamp * May sleep. 2196470decc6SDave Kleikamp */ 2197f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) 2198470decc6SDave Kleikamp { 2199470decc6SDave Kleikamp struct journal_head *jh; 2200470decc6SDave Kleikamp struct journal_head *new_jh = NULL; 2201470decc6SDave Kleikamp 2202470decc6SDave Kleikamp repeat: 2203470decc6SDave Kleikamp if (!buffer_jbd(bh)) { 2204470decc6SDave Kleikamp new_jh = journal_alloc_journal_head(); 2205470decc6SDave Kleikamp memset(new_jh, 0, sizeof(*new_jh)); 2206470decc6SDave Kleikamp } 2207470decc6SDave Kleikamp 2208470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2209470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2210470decc6SDave Kleikamp jh = bh2jh(bh); 2211470decc6SDave Kleikamp } else { 2212470decc6SDave Kleikamp J_ASSERT_BH(bh, 2213470decc6SDave Kleikamp (atomic_read(&bh->b_count) > 0) || 2214470decc6SDave Kleikamp (bh->b_page && bh->b_page->mapping)); 2215470decc6SDave Kleikamp 2216470decc6SDave Kleikamp if (!new_jh) { 2217470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2218470decc6SDave Kleikamp goto repeat; 2219470decc6SDave Kleikamp } 2220470decc6SDave Kleikamp 2221470decc6SDave Kleikamp jh = new_jh; 2222470decc6SDave Kleikamp new_jh = NULL; /* We consumed it */ 2223470decc6SDave Kleikamp set_buffer_jbd(bh); 2224470decc6SDave Kleikamp bh->b_private = jh; 2225470decc6SDave Kleikamp jh->b_bh = bh; 2226470decc6SDave Kleikamp get_bh(bh); 2227470decc6SDave Kleikamp BUFFER_TRACE(bh, "added journal_head"); 2228470decc6SDave Kleikamp } 2229470decc6SDave Kleikamp jh->b_jcount++; 2230470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2231470decc6SDave Kleikamp if (new_jh) 2232470decc6SDave Kleikamp journal_free_journal_head(new_jh); 2233470decc6SDave Kleikamp return bh->b_private; 2234470decc6SDave Kleikamp } 2235470decc6SDave Kleikamp 2236470decc6SDave Kleikamp /* 2237470decc6SDave Kleikamp * Grab a ref against this buffer_head's journal_head. If it ended up not 2238470decc6SDave Kleikamp * having a journal_head, return NULL 2239470decc6SDave Kleikamp */ 2240f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) 2241470decc6SDave Kleikamp { 2242470decc6SDave Kleikamp struct journal_head *jh = NULL; 2243470decc6SDave Kleikamp 2244470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2245470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2246470decc6SDave Kleikamp jh = bh2jh(bh); 2247470decc6SDave Kleikamp jh->b_jcount++; 2248470decc6SDave Kleikamp } 2249470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2250470decc6SDave Kleikamp return jh; 2251470decc6SDave Kleikamp } 2252470decc6SDave Kleikamp 2253470decc6SDave Kleikamp static void __journal_remove_journal_head(struct buffer_head *bh) 2254470decc6SDave Kleikamp { 2255470decc6SDave Kleikamp struct journal_head *jh = bh2jh(bh); 2256470decc6SDave Kleikamp 2257470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount >= 0); 2258de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_transaction == NULL); 2259de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_next_transaction == NULL); 2260de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); 2261470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jlist == BJ_None); 2262470decc6SDave Kleikamp J_ASSERT_BH(bh, buffer_jbd(bh)); 2263470decc6SDave Kleikamp J_ASSERT_BH(bh, jh2bh(jh) == bh); 2264470decc6SDave Kleikamp BUFFER_TRACE(bh, "remove journal_head"); 2265470decc6SDave Kleikamp if (jh->b_frozen_data) { 2266de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__); 2267af1e76d6SMingming Cao jbd2_free(jh->b_frozen_data, bh->b_size); 2268470decc6SDave Kleikamp } 2269470decc6SDave Kleikamp if (jh->b_committed_data) { 2270de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__); 2271af1e76d6SMingming Cao jbd2_free(jh->b_committed_data, bh->b_size); 2272470decc6SDave Kleikamp } 2273470decc6SDave Kleikamp bh->b_private = NULL; 2274470decc6SDave Kleikamp jh->b_bh = NULL; /* debug, really */ 2275470decc6SDave Kleikamp clear_buffer_jbd(bh); 2276470decc6SDave Kleikamp journal_free_journal_head(jh); 2277470decc6SDave Kleikamp } 2278470decc6SDave Kleikamp 2279470decc6SDave Kleikamp /* 2280de1b7941SJan Kara * Drop a reference on the passed journal_head. If it fell to zero then 2281470decc6SDave Kleikamp * release the journal_head from the buffer_head. 2282470decc6SDave Kleikamp */ 2283f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh) 2284470decc6SDave Kleikamp { 2285470decc6SDave Kleikamp struct buffer_head *bh = jh2bh(jh); 2286470decc6SDave Kleikamp 2287470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2288470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount > 0); 2289470decc6SDave Kleikamp --jh->b_jcount; 2290de1b7941SJan Kara if (!jh->b_jcount) { 2291470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2292de1b7941SJan Kara jbd_unlock_bh_journal_head(bh); 2293470decc6SDave Kleikamp __brelse(bh); 2294de1b7941SJan Kara } else 2295470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2296470decc6SDave Kleikamp } 2297470decc6SDave Kleikamp 2298470decc6SDave Kleikamp /* 2299c851ed54SJan Kara * Initialize jbd inode head 2300c851ed54SJan Kara */ 2301c851ed54SJan Kara void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) 2302c851ed54SJan Kara { 2303c851ed54SJan Kara jinode->i_transaction = NULL; 2304c851ed54SJan Kara jinode->i_next_transaction = NULL; 2305c851ed54SJan Kara jinode->i_vfs_inode = inode; 2306c851ed54SJan Kara jinode->i_flags = 0; 2307c851ed54SJan Kara INIT_LIST_HEAD(&jinode->i_list); 2308c851ed54SJan Kara } 2309c851ed54SJan Kara 2310c851ed54SJan Kara /* 2311c851ed54SJan Kara * Function to be called before we start removing inode from memory (i.e., 2312c851ed54SJan Kara * clear_inode() is a fine place to be called from). It removes inode from 2313c851ed54SJan Kara * transaction's lists. 2314c851ed54SJan Kara */ 2315c851ed54SJan Kara void jbd2_journal_release_jbd_inode(journal_t *journal, 2316c851ed54SJan Kara struct jbd2_inode *jinode) 2317c851ed54SJan Kara { 2318c851ed54SJan Kara if (!journal) 2319c851ed54SJan Kara return; 2320c851ed54SJan Kara restart: 2321c851ed54SJan Kara spin_lock(&journal->j_list_lock); 2322c851ed54SJan Kara /* Is commit writing out inode - we have to wait */ 232339e3ac25SBrian King if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) { 2324c851ed54SJan Kara wait_queue_head_t *wq; 2325c851ed54SJan Kara DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); 2326c851ed54SJan Kara wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); 2327c851ed54SJan Kara prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); 2328c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2329c851ed54SJan Kara schedule(); 2330c851ed54SJan Kara finish_wait(wq, &wait.wait); 2331c851ed54SJan Kara goto restart; 2332c851ed54SJan Kara } 2333c851ed54SJan Kara 2334c851ed54SJan Kara if (jinode->i_transaction) { 2335c851ed54SJan Kara list_del(&jinode->i_list); 2336c851ed54SJan Kara jinode->i_transaction = NULL; 2337c851ed54SJan Kara } 2338c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2339c851ed54SJan Kara } 2340c851ed54SJan Kara 2341c851ed54SJan Kara /* 23420f49d5d0SJose R. Santos * debugfs tunables 2343470decc6SDave Kleikamp */ 23446f38c74fSJose R. Santos #ifdef CONFIG_JBD2_DEBUG 23456f38c74fSJose R. Santos u8 jbd2_journal_enable_debug __read_mostly; 2346f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_enable_debug); 2347470decc6SDave Kleikamp 23480f49d5d0SJose R. Santos #define JBD2_DEBUG_NAME "jbd2-debug" 2349470decc6SDave Kleikamp 23506f38c74fSJose R. Santos static struct dentry *jbd2_debugfs_dir; 23516f38c74fSJose R. Santos static struct dentry *jbd2_debug; 23520f49d5d0SJose R. Santos 23530f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 2354470decc6SDave Kleikamp { 23550f49d5d0SJose R. Santos jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL); 23560f49d5d0SJose R. Santos if (jbd2_debugfs_dir) 2357765f8361SYin Kangkai jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, 2358765f8361SYin Kangkai S_IRUGO | S_IWUSR, 23590f49d5d0SJose R. Santos jbd2_debugfs_dir, 23600f49d5d0SJose R. Santos &jbd2_journal_enable_debug); 2361470decc6SDave Kleikamp } 2362470decc6SDave Kleikamp 23630f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 2364470decc6SDave Kleikamp { 23650f49d5d0SJose R. Santos debugfs_remove(jbd2_debug); 23660f49d5d0SJose R. Santos debugfs_remove(jbd2_debugfs_dir); 2367470decc6SDave Kleikamp } 2368470decc6SDave Kleikamp 2369470decc6SDave Kleikamp #else 2370470decc6SDave Kleikamp 23710f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 23720f49d5d0SJose R. Santos { 23730f49d5d0SJose R. Santos } 23740f49d5d0SJose R. Santos 23750f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 23760f49d5d0SJose R. Santos { 23770f49d5d0SJose R. Santos } 2378470decc6SDave Kleikamp 2379470decc6SDave Kleikamp #endif 2380470decc6SDave Kleikamp 23818e85fb3fSJohann Lombardi #ifdef CONFIG_PROC_FS 23828e85fb3fSJohann Lombardi 23838e85fb3fSJohann Lombardi #define JBD2_STATS_PROC_NAME "fs/jbd2" 23848e85fb3fSJohann Lombardi 23858e85fb3fSJohann Lombardi static void __init jbd2_create_jbd_stats_proc_entry(void) 23868e85fb3fSJohann Lombardi { 23878e85fb3fSJohann Lombardi proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); 23888e85fb3fSJohann Lombardi } 23898e85fb3fSJohann Lombardi 23908e85fb3fSJohann Lombardi static void __exit jbd2_remove_jbd_stats_proc_entry(void) 23918e85fb3fSJohann Lombardi { 23928e85fb3fSJohann Lombardi if (proc_jbd2_stats) 23938e85fb3fSJohann Lombardi remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); 23948e85fb3fSJohann Lombardi } 23958e85fb3fSJohann Lombardi 23968e85fb3fSJohann Lombardi #else 23978e85fb3fSJohann Lombardi 23988e85fb3fSJohann Lombardi #define jbd2_create_jbd_stats_proc_entry() do {} while (0) 23998e85fb3fSJohann Lombardi #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) 24008e85fb3fSJohann Lombardi 24018e85fb3fSJohann Lombardi #endif 24028e85fb3fSJohann Lombardi 24038aefcd55STheodore Ts'o struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; 2404470decc6SDave Kleikamp 24054185a2acSYongqiang Yang static int __init jbd2_journal_init_handle_cache(void) 2406470decc6SDave Kleikamp { 24078aefcd55STheodore Ts'o jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); 2408f7f4bccbSMingming Cao if (jbd2_handle_cache == NULL) { 24098aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create handle cache\n"); 24108aefcd55STheodore Ts'o return -ENOMEM; 24118aefcd55STheodore Ts'o } 24128aefcd55STheodore Ts'o jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); 24138aefcd55STheodore Ts'o if (jbd2_inode_cache == NULL) { 24148aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create inode cache\n"); 24158aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_handle_cache); 2416470decc6SDave Kleikamp return -ENOMEM; 2417470decc6SDave Kleikamp } 2418470decc6SDave Kleikamp return 0; 2419470decc6SDave Kleikamp } 2420470decc6SDave Kleikamp 2421f7f4bccbSMingming Cao static void jbd2_journal_destroy_handle_cache(void) 2422470decc6SDave Kleikamp { 2423f7f4bccbSMingming Cao if (jbd2_handle_cache) 2424f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_handle_cache); 24258aefcd55STheodore Ts'o if (jbd2_inode_cache) 24268aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_inode_cache); 24278aefcd55STheodore Ts'o 2428470decc6SDave Kleikamp } 2429470decc6SDave Kleikamp 2430470decc6SDave Kleikamp /* 2431470decc6SDave Kleikamp * Module startup and shutdown 2432470decc6SDave Kleikamp */ 2433470decc6SDave Kleikamp 2434470decc6SDave Kleikamp static int __init journal_init_caches(void) 2435470decc6SDave Kleikamp { 2436470decc6SDave Kleikamp int ret; 2437470decc6SDave Kleikamp 2438f7f4bccbSMingming Cao ret = jbd2_journal_init_revoke_caches(); 2439470decc6SDave Kleikamp if (ret == 0) 24404185a2acSYongqiang Yang ret = jbd2_journal_init_journal_head_cache(); 2441470decc6SDave Kleikamp if (ret == 0) 24424185a2acSYongqiang Yang ret = jbd2_journal_init_handle_cache(); 24430c2022ecSYongqiang Yang if (ret == 0) 24440c2022ecSYongqiang Yang ret = jbd2_journal_init_transaction_cache(); 2445470decc6SDave Kleikamp return ret; 2446470decc6SDave Kleikamp } 2447470decc6SDave Kleikamp 2448f7f4bccbSMingming Cao static void jbd2_journal_destroy_caches(void) 2449470decc6SDave Kleikamp { 2450f7f4bccbSMingming Cao jbd2_journal_destroy_revoke_caches(); 24514185a2acSYongqiang Yang jbd2_journal_destroy_journal_head_cache(); 2452f7f4bccbSMingming Cao jbd2_journal_destroy_handle_cache(); 24530c2022ecSYongqiang Yang jbd2_journal_destroy_transaction_cache(); 2454d2eecb03STheodore Ts'o jbd2_journal_destroy_slabs(); 2455470decc6SDave Kleikamp } 2456470decc6SDave Kleikamp 2457470decc6SDave Kleikamp static int __init journal_init(void) 2458470decc6SDave Kleikamp { 2459470decc6SDave Kleikamp int ret; 2460470decc6SDave Kleikamp 2461470decc6SDave Kleikamp BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); 2462470decc6SDave Kleikamp 2463470decc6SDave Kleikamp ret = journal_init_caches(); 2464620de4e1SDuane Griffin if (ret == 0) { 24650f49d5d0SJose R. Santos jbd2_create_debugfs_entry(); 24668e85fb3fSJohann Lombardi jbd2_create_jbd_stats_proc_entry(); 2467620de4e1SDuane Griffin } else { 2468620de4e1SDuane Griffin jbd2_journal_destroy_caches(); 2469620de4e1SDuane Griffin } 2470470decc6SDave Kleikamp return ret; 2471470decc6SDave Kleikamp } 2472470decc6SDave Kleikamp 2473470decc6SDave Kleikamp static void __exit journal_exit(void) 2474470decc6SDave Kleikamp { 2475e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2476470decc6SDave Kleikamp int n = atomic_read(&nr_journal_heads); 2477470decc6SDave Kleikamp if (n) 2478f2a44523SEryu Guan printk(KERN_EMERG "JBD2: leaked %d journal_heads!\n", n); 2479470decc6SDave Kleikamp #endif 24800f49d5d0SJose R. Santos jbd2_remove_debugfs_entry(); 24818e85fb3fSJohann Lombardi jbd2_remove_jbd_stats_proc_entry(); 2482f7f4bccbSMingming Cao jbd2_journal_destroy_caches(); 2483470decc6SDave Kleikamp } 2484470decc6SDave Kleikamp 2485470decc6SDave Kleikamp MODULE_LICENSE("GPL"); 2486470decc6SDave Kleikamp module_init(journal_init); 2487470decc6SDave Kleikamp module_exit(journal_exit); 2488470decc6SDave Kleikamp 2489