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 74579feb521SJan Kara /* 74679feb521SJan Kara * Return tid of the oldest transaction in the journal and block in the journal 74779feb521SJan Kara * where the transaction starts. 74879feb521SJan Kara * 74979feb521SJan Kara * If the journal is now empty, return which will be the next transaction ID 75079feb521SJan Kara * we will write and where will that transaction start. 75179feb521SJan Kara * 75279feb521SJan Kara * The return value is 0 if journal tail cannot be pushed any further, 1 if 75379feb521SJan Kara * it can. 75479feb521SJan Kara */ 75579feb521SJan Kara int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, 75679feb521SJan Kara unsigned long *block) 75779feb521SJan Kara { 75879feb521SJan Kara transaction_t *transaction; 75979feb521SJan Kara int ret; 76079feb521SJan Kara 76179feb521SJan Kara read_lock(&journal->j_state_lock); 76279feb521SJan Kara spin_lock(&journal->j_list_lock); 76379feb521SJan Kara transaction = journal->j_checkpoint_transactions; 76479feb521SJan Kara if (transaction) { 76579feb521SJan Kara *tid = transaction->t_tid; 76679feb521SJan Kara *block = transaction->t_log_start; 76779feb521SJan Kara } else if ((transaction = journal->j_committing_transaction) != NULL) { 76879feb521SJan Kara *tid = transaction->t_tid; 76979feb521SJan Kara *block = transaction->t_log_start; 77079feb521SJan Kara } else if ((transaction = journal->j_running_transaction) != NULL) { 77179feb521SJan Kara *tid = transaction->t_tid; 77279feb521SJan Kara *block = journal->j_head; 77379feb521SJan Kara } else { 77479feb521SJan Kara *tid = journal->j_transaction_sequence; 77579feb521SJan Kara *block = journal->j_head; 77679feb521SJan Kara } 77779feb521SJan Kara ret = tid_gt(*tid, journal->j_tail_sequence); 77879feb521SJan Kara spin_unlock(&journal->j_list_lock); 77979feb521SJan Kara read_unlock(&journal->j_state_lock); 78079feb521SJan Kara 78179feb521SJan Kara return ret; 78279feb521SJan Kara } 78379feb521SJan Kara 78479feb521SJan Kara /* 78579feb521SJan Kara * Update information in journal structure and in on disk journal superblock 78679feb521SJan Kara * about log tail. This function does not check whether information passed in 78779feb521SJan Kara * really pushes log tail further. It's responsibility of the caller to make 78879feb521SJan Kara * sure provided log tail information is valid (e.g. by holding 78979feb521SJan Kara * j_checkpoint_mutex all the time between computing log tail and calling this 79079feb521SJan Kara * function as is the case with jbd2_cleanup_journal_tail()). 79179feb521SJan Kara * 79279feb521SJan Kara * Requires j_checkpoint_mutex 79379feb521SJan Kara */ 79479feb521SJan Kara void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 79579feb521SJan Kara { 79679feb521SJan Kara unsigned long freed; 79779feb521SJan Kara 79879feb521SJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 79979feb521SJan Kara 80079feb521SJan Kara /* 80179feb521SJan Kara * We cannot afford for write to remain in drive's caches since as 80279feb521SJan Kara * soon as we update j_tail, next transaction can start reusing journal 80379feb521SJan Kara * space and if we lose sb update during power failure we'd replay 80479feb521SJan Kara * old transaction with possibly newly overwritten data. 80579feb521SJan Kara */ 80679feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, tid, block, WRITE_FUA); 80779feb521SJan Kara write_lock(&journal->j_state_lock); 80879feb521SJan Kara freed = block - journal->j_tail; 80979feb521SJan Kara if (block < journal->j_tail) 81079feb521SJan Kara freed += journal->j_last - journal->j_first; 81179feb521SJan Kara 81279feb521SJan Kara trace_jbd2_update_log_tail(journal, tid, block, freed); 81379feb521SJan Kara jbd_debug(1, 81479feb521SJan Kara "Cleaning journal tail from %d to %d (offset %lu), " 81579feb521SJan Kara "freeing %lu\n", 81679feb521SJan Kara journal->j_tail_sequence, tid, block, freed); 81779feb521SJan Kara 81879feb521SJan Kara journal->j_free += freed; 81979feb521SJan Kara journal->j_tail_sequence = tid; 82079feb521SJan Kara journal->j_tail = block; 82179feb521SJan Kara write_unlock(&journal->j_state_lock); 82279feb521SJan Kara } 82379feb521SJan Kara 824*3339578fSJan Kara /* 825*3339578fSJan Kara * This is a variaon of __jbd2_update_log_tail which checks for validity of 826*3339578fSJan Kara * provided log tail and locks j_checkpoint_mutex. So it is safe against races 827*3339578fSJan Kara * with other threads updating log tail. 828*3339578fSJan Kara */ 829*3339578fSJan Kara void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 830*3339578fSJan Kara { 831*3339578fSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 832*3339578fSJan Kara if (tid_gt(tid, journal->j_tail_sequence)) 833*3339578fSJan Kara __jbd2_update_log_tail(journal, tid, block); 834*3339578fSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 835*3339578fSJan Kara } 836*3339578fSJan Kara 8378e85fb3fSJohann Lombardi struct jbd2_stats_proc_session { 8388e85fb3fSJohann Lombardi journal_t *journal; 8398e85fb3fSJohann Lombardi struct transaction_stats_s *stats; 8408e85fb3fSJohann Lombardi int start; 8418e85fb3fSJohann Lombardi int max; 8428e85fb3fSJohann Lombardi }; 8438e85fb3fSJohann Lombardi 8448e85fb3fSJohann Lombardi static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) 8458e85fb3fSJohann Lombardi { 8468e85fb3fSJohann Lombardi return *pos ? NULL : SEQ_START_TOKEN; 8478e85fb3fSJohann Lombardi } 8488e85fb3fSJohann Lombardi 8498e85fb3fSJohann Lombardi static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) 8508e85fb3fSJohann Lombardi { 8518e85fb3fSJohann Lombardi return NULL; 8528e85fb3fSJohann Lombardi } 8538e85fb3fSJohann Lombardi 8548e85fb3fSJohann Lombardi static int jbd2_seq_info_show(struct seq_file *seq, void *v) 8558e85fb3fSJohann Lombardi { 8568e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 8578e85fb3fSJohann Lombardi 8588e85fb3fSJohann Lombardi if (v != SEQ_START_TOKEN) 8598e85fb3fSJohann Lombardi return 0; 8608e85fb3fSJohann Lombardi seq_printf(seq, "%lu transaction, each up to %u blocks\n", 8618e85fb3fSJohann Lombardi s->stats->ts_tid, 8628e85fb3fSJohann Lombardi s->journal->j_max_transaction_buffers); 8638e85fb3fSJohann Lombardi if (s->stats->ts_tid == 0) 8648e85fb3fSJohann Lombardi return 0; 8658e85fb3fSJohann Lombardi seq_printf(seq, "average: \n %ums waiting for transaction\n", 866bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); 8678e85fb3fSJohann Lombardi seq_printf(seq, " %ums running transaction\n", 868bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); 8698e85fb3fSJohann Lombardi seq_printf(seq, " %ums transaction was being locked\n", 870bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); 8718e85fb3fSJohann Lombardi seq_printf(seq, " %ums flushing data (in ordered mode)\n", 872bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); 8738e85fb3fSJohann Lombardi seq_printf(seq, " %ums logging transaction\n", 874bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); 875c225aa57SSimon Holm Thøgersen seq_printf(seq, " %lluus average transaction commit time\n", 876c225aa57SSimon Holm Thøgersen div_u64(s->journal->j_average_commit_time, 1000)); 8778e85fb3fSJohann Lombardi seq_printf(seq, " %lu handles per transaction\n", 878bf699327STheodore Ts'o s->stats->run.rs_handle_count / s->stats->ts_tid); 8798e85fb3fSJohann Lombardi seq_printf(seq, " %lu blocks per transaction\n", 880bf699327STheodore Ts'o s->stats->run.rs_blocks / s->stats->ts_tid); 8818e85fb3fSJohann Lombardi seq_printf(seq, " %lu logged blocks per transaction\n", 882bf699327STheodore Ts'o s->stats->run.rs_blocks_logged / s->stats->ts_tid); 8838e85fb3fSJohann Lombardi return 0; 8848e85fb3fSJohann Lombardi } 8858e85fb3fSJohann Lombardi 8868e85fb3fSJohann Lombardi static void jbd2_seq_info_stop(struct seq_file *seq, void *v) 8878e85fb3fSJohann Lombardi { 8888e85fb3fSJohann Lombardi } 8898e85fb3fSJohann Lombardi 89088e9d34cSJames Morris static const struct seq_operations jbd2_seq_info_ops = { 8918e85fb3fSJohann Lombardi .start = jbd2_seq_info_start, 8928e85fb3fSJohann Lombardi .next = jbd2_seq_info_next, 8938e85fb3fSJohann Lombardi .stop = jbd2_seq_info_stop, 8948e85fb3fSJohann Lombardi .show = jbd2_seq_info_show, 8958e85fb3fSJohann Lombardi }; 8968e85fb3fSJohann Lombardi 8978e85fb3fSJohann Lombardi static int jbd2_seq_info_open(struct inode *inode, struct file *file) 8988e85fb3fSJohann Lombardi { 8998e85fb3fSJohann Lombardi journal_t *journal = PDE(inode)->data; 9008e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 9018e85fb3fSJohann Lombardi int rc, size; 9028e85fb3fSJohann Lombardi 9038e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 9048e85fb3fSJohann Lombardi if (s == NULL) 9058e85fb3fSJohann Lombardi return -ENOMEM; 9068e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s); 9078e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 9088e85fb3fSJohann Lombardi if (s->stats == NULL) { 9098e85fb3fSJohann Lombardi kfree(s); 9108e85fb3fSJohann Lombardi return -ENOMEM; 9118e85fb3fSJohann Lombardi } 9128e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 9138e85fb3fSJohann Lombardi memcpy(s->stats, &journal->j_stats, size); 9148e85fb3fSJohann Lombardi s->journal = journal; 9158e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 9168e85fb3fSJohann Lombardi 9178e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_info_ops); 9188e85fb3fSJohann Lombardi if (rc == 0) { 9198e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 9208e85fb3fSJohann Lombardi m->private = s; 9218e85fb3fSJohann Lombardi } else { 9228e85fb3fSJohann Lombardi kfree(s->stats); 9238e85fb3fSJohann Lombardi kfree(s); 9248e85fb3fSJohann Lombardi } 9258e85fb3fSJohann Lombardi return rc; 9268e85fb3fSJohann Lombardi 9278e85fb3fSJohann Lombardi } 9288e85fb3fSJohann Lombardi 9298e85fb3fSJohann Lombardi static int jbd2_seq_info_release(struct inode *inode, struct file *file) 9308e85fb3fSJohann Lombardi { 9318e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 9328e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 9338e85fb3fSJohann Lombardi kfree(s->stats); 9348e85fb3fSJohann Lombardi kfree(s); 9358e85fb3fSJohann Lombardi return seq_release(inode, file); 9368e85fb3fSJohann Lombardi } 9378e85fb3fSJohann Lombardi 938828c0950SAlexey Dobriyan static const struct file_operations jbd2_seq_info_fops = { 9398e85fb3fSJohann Lombardi .owner = THIS_MODULE, 9408e85fb3fSJohann Lombardi .open = jbd2_seq_info_open, 9418e85fb3fSJohann Lombardi .read = seq_read, 9428e85fb3fSJohann Lombardi .llseek = seq_lseek, 9438e85fb3fSJohann Lombardi .release = jbd2_seq_info_release, 9448e85fb3fSJohann Lombardi }; 9458e85fb3fSJohann Lombardi 9468e85fb3fSJohann Lombardi static struct proc_dir_entry *proc_jbd2_stats; 9478e85fb3fSJohann Lombardi 9488e85fb3fSJohann Lombardi static void jbd2_stats_proc_init(journal_t *journal) 9498e85fb3fSJohann Lombardi { 95005496769STheodore Ts'o journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); 9518e85fb3fSJohann Lombardi if (journal->j_proc_entry) { 95279da3664SDenis V. Lunev proc_create_data("info", S_IRUGO, journal->j_proc_entry, 95379da3664SDenis V. Lunev &jbd2_seq_info_fops, journal); 9548e85fb3fSJohann Lombardi } 9558e85fb3fSJohann Lombardi } 9568e85fb3fSJohann Lombardi 9578e85fb3fSJohann Lombardi static void jbd2_stats_proc_exit(journal_t *journal) 9588e85fb3fSJohann Lombardi { 9598e85fb3fSJohann Lombardi remove_proc_entry("info", journal->j_proc_entry); 96005496769STheodore Ts'o remove_proc_entry(journal->j_devname, proc_jbd2_stats); 9618e85fb3fSJohann Lombardi } 9628e85fb3fSJohann Lombardi 963470decc6SDave Kleikamp /* 964470decc6SDave Kleikamp * Management for journal control blocks: functions to create and 965470decc6SDave Kleikamp * destroy journal_t structures, and to initialise and read existing 966470decc6SDave Kleikamp * journal blocks from disk. */ 967470decc6SDave Kleikamp 968470decc6SDave Kleikamp /* First: create and setup a journal_t object in memory. We initialise 969470decc6SDave Kleikamp * very few fields yet: that has to wait until we have created the 970470decc6SDave Kleikamp * journal structures from from scratch, or loaded them from disk. */ 971470decc6SDave Kleikamp 972470decc6SDave Kleikamp static journal_t * journal_init_common (void) 973470decc6SDave Kleikamp { 974470decc6SDave Kleikamp journal_t *journal; 975470decc6SDave Kleikamp int err; 976470decc6SDave Kleikamp 9773ebfdf88SAndrew Morton journal = kzalloc(sizeof(*journal), GFP_KERNEL); 978470decc6SDave Kleikamp if (!journal) 979b7271b0aSTheodore Ts'o return NULL; 980470decc6SDave Kleikamp 981470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_transaction_locked); 982470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_logspace); 983470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_done_commit); 984470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_checkpoint); 985470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_commit); 986470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_updates); 987470decc6SDave Kleikamp mutex_init(&journal->j_barrier); 988470decc6SDave Kleikamp mutex_init(&journal->j_checkpoint_mutex); 989470decc6SDave Kleikamp spin_lock_init(&journal->j_revoke_lock); 990470decc6SDave Kleikamp spin_lock_init(&journal->j_list_lock); 991a931da6aSTheodore Ts'o rwlock_init(&journal->j_state_lock); 992470decc6SDave Kleikamp 993cd02ff0bSMingming Cao journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); 99430773840STheodore Ts'o journal->j_min_batch_time = 0; 99530773840STheodore Ts'o journal->j_max_batch_time = 15000; /* 15ms */ 996470decc6SDave Kleikamp 997470decc6SDave Kleikamp /* The journal is marked for error until we succeed with recovery! */ 998f7f4bccbSMingming Cao journal->j_flags = JBD2_ABORT; 999470decc6SDave Kleikamp 1000470decc6SDave Kleikamp /* Set up a default-sized revoke table for the new mount. */ 1001f7f4bccbSMingming Cao err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); 1002470decc6SDave Kleikamp if (err) { 1003470decc6SDave Kleikamp kfree(journal); 1004b7271b0aSTheodore Ts'o return NULL; 1005470decc6SDave Kleikamp } 10068e85fb3fSJohann Lombardi 1007bf699327STheodore Ts'o spin_lock_init(&journal->j_history_lock); 10088e85fb3fSJohann Lombardi 1009470decc6SDave Kleikamp return journal; 1010470decc6SDave Kleikamp } 1011470decc6SDave Kleikamp 1012f7f4bccbSMingming Cao /* jbd2_journal_init_dev and jbd2_journal_init_inode: 1013470decc6SDave Kleikamp * 1014470decc6SDave Kleikamp * Create a journal structure assigned some fixed set of disk blocks to 1015470decc6SDave Kleikamp * the journal. We don't actually touch those disk blocks yet, but we 1016470decc6SDave Kleikamp * need to set up all of the mapping information to tell the journaling 1017470decc6SDave Kleikamp * system where the journal blocks are. 1018470decc6SDave Kleikamp * 1019470decc6SDave Kleikamp */ 1020470decc6SDave Kleikamp 1021470decc6SDave Kleikamp /** 10225648ba5bSRandy Dunlap * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure 1023470decc6SDave Kleikamp * @bdev: Block device on which to create the journal 1024470decc6SDave Kleikamp * @fs_dev: Device which hold journalled filesystem for this journal. 1025470decc6SDave Kleikamp * @start: Block nr Start of journal. 1026470decc6SDave Kleikamp * @len: Length of the journal in blocks. 1027470decc6SDave Kleikamp * @blocksize: blocksize of journalling device 10285648ba5bSRandy Dunlap * 10295648ba5bSRandy Dunlap * Returns: a newly created journal_t * 1030470decc6SDave Kleikamp * 1031f7f4bccbSMingming Cao * jbd2_journal_init_dev creates a journal which maps a fixed contiguous 1032470decc6SDave Kleikamp * range of blocks on an arbitrary block device. 1033470decc6SDave Kleikamp * 1034470decc6SDave Kleikamp */ 1035f7f4bccbSMingming Cao journal_t * jbd2_journal_init_dev(struct block_device *bdev, 1036470decc6SDave Kleikamp struct block_device *fs_dev, 103718eba7aaSMingming Cao unsigned long long start, int len, int blocksize) 1038470decc6SDave Kleikamp { 1039470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 1040470decc6SDave Kleikamp struct buffer_head *bh; 104105496769STheodore Ts'o char *p; 1042470decc6SDave Kleikamp int n; 1043470decc6SDave Kleikamp 1044470decc6SDave Kleikamp if (!journal) 1045470decc6SDave Kleikamp return NULL; 1046470decc6SDave Kleikamp 1047470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1048470decc6SDave Kleikamp journal->j_blocksize = blocksize; 10490587aa3dSyangsheng journal->j_dev = bdev; 10500587aa3dSyangsheng journal->j_fs_dev = fs_dev; 10510587aa3dSyangsheng journal->j_blk_offset = start; 10520587aa3dSyangsheng journal->j_maxlen = len; 10530587aa3dSyangsheng bdevname(journal->j_dev, journal->j_devname); 10540587aa3dSyangsheng p = journal->j_devname; 10550587aa3dSyangsheng while ((p = strchr(p, '/'))) 10560587aa3dSyangsheng *p = '!'; 10574b905671SJan Kara jbd2_stats_proc_init(journal); 1058470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1059470decc6SDave Kleikamp journal->j_wbufsize = n; 1060470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1061470decc6SDave Kleikamp if (!journal->j_wbuf) { 106225985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1063329d291fSHarvey Harrison __func__); 10644b905671SJan Kara goto out_err; 1065470decc6SDave Kleikamp } 1066470decc6SDave Kleikamp 1067470decc6SDave Kleikamp bh = __getblk(journal->j_dev, start, journal->j_blocksize); 10684b905671SJan Kara if (!bh) { 10694b905671SJan Kara printk(KERN_ERR 10704b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 10714b905671SJan Kara __func__); 10724b905671SJan Kara goto out_err; 10734b905671SJan Kara } 1074470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1075470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 10764b905671SJan Kara 1077470decc6SDave Kleikamp return journal; 10784b905671SJan Kara out_err: 10797b02bec0STao Ma kfree(journal->j_wbuf); 10804b905671SJan Kara jbd2_stats_proc_exit(journal); 10814b905671SJan Kara kfree(journal); 10824b905671SJan Kara return NULL; 1083470decc6SDave Kleikamp } 1084470decc6SDave Kleikamp 1085470decc6SDave Kleikamp /** 1086f7f4bccbSMingming Cao * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. 1087470decc6SDave Kleikamp * @inode: An inode to create the journal in 1088470decc6SDave Kleikamp * 1089f7f4bccbSMingming Cao * jbd2_journal_init_inode creates a journal which maps an on-disk inode as 1090470decc6SDave Kleikamp * the journal. The inode must exist already, must support bmap() and 1091470decc6SDave Kleikamp * must have all data blocks preallocated. 1092470decc6SDave Kleikamp */ 1093f7f4bccbSMingming Cao journal_t * jbd2_journal_init_inode (struct inode *inode) 1094470decc6SDave Kleikamp { 1095470decc6SDave Kleikamp struct buffer_head *bh; 1096470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 109705496769STheodore Ts'o char *p; 1098470decc6SDave Kleikamp int err; 1099470decc6SDave Kleikamp int n; 110018eba7aaSMingming Cao unsigned long long blocknr; 1101470decc6SDave Kleikamp 1102470decc6SDave Kleikamp if (!journal) 1103470decc6SDave Kleikamp return NULL; 1104470decc6SDave Kleikamp 1105470decc6SDave Kleikamp journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; 1106470decc6SDave Kleikamp journal->j_inode = inode; 110705496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 110805496769STheodore Ts'o p = journal->j_devname; 110905496769STheodore Ts'o while ((p = strchr(p, '/'))) 111005496769STheodore Ts'o *p = '!'; 111105496769STheodore Ts'o p = journal->j_devname + strlen(journal->j_devname); 111290576c0bSTheodore Ts'o sprintf(p, "-%lu", journal->j_inode->i_ino); 1113470decc6SDave Kleikamp jbd_debug(1, 1114470decc6SDave Kleikamp "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", 1115470decc6SDave Kleikamp journal, inode->i_sb->s_id, inode->i_ino, 1116470decc6SDave Kleikamp (long long) inode->i_size, 1117470decc6SDave Kleikamp inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); 1118470decc6SDave Kleikamp 1119470decc6SDave Kleikamp journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; 1120470decc6SDave Kleikamp journal->j_blocksize = inode->i_sb->s_blocksize; 11218e85fb3fSJohann Lombardi jbd2_stats_proc_init(journal); 1122470decc6SDave Kleikamp 1123470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1124470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1125470decc6SDave Kleikamp journal->j_wbufsize = n; 1126470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1127470decc6SDave Kleikamp if (!journal->j_wbuf) { 112825985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1129329d291fSHarvey Harrison __func__); 11304b905671SJan Kara goto out_err; 1131470decc6SDave Kleikamp } 1132470decc6SDave Kleikamp 1133f7f4bccbSMingming Cao err = jbd2_journal_bmap(journal, 0, &blocknr); 1134470decc6SDave Kleikamp /* If that failed, give up */ 1135470decc6SDave Kleikamp if (err) { 11363c26bdb4SJustin P. Mattock printk(KERN_ERR "%s: Cannot locate journal superblock\n", 1137329d291fSHarvey Harrison __func__); 11384b905671SJan Kara goto out_err; 1139470decc6SDave Kleikamp } 1140470decc6SDave Kleikamp 1141470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 11424b905671SJan Kara if (!bh) { 11434b905671SJan Kara printk(KERN_ERR 11444b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 11454b905671SJan Kara __func__); 11464b905671SJan Kara goto out_err; 11474b905671SJan Kara } 1148470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1149470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 1150470decc6SDave Kleikamp 1151470decc6SDave Kleikamp return journal; 11524b905671SJan Kara out_err: 11537b02bec0STao Ma kfree(journal->j_wbuf); 11544b905671SJan Kara jbd2_stats_proc_exit(journal); 11554b905671SJan Kara kfree(journal); 11564b905671SJan Kara return NULL; 1157470decc6SDave Kleikamp } 1158470decc6SDave Kleikamp 1159470decc6SDave Kleikamp /* 1160470decc6SDave Kleikamp * If the journal init or create aborts, we need to mark the journal 1161470decc6SDave Kleikamp * superblock as being NULL to prevent the journal destroy from writing 1162470decc6SDave Kleikamp * back a bogus superblock. 1163470decc6SDave Kleikamp */ 1164470decc6SDave Kleikamp static void journal_fail_superblock (journal_t *journal) 1165470decc6SDave Kleikamp { 1166470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1167470decc6SDave Kleikamp brelse(bh); 1168470decc6SDave Kleikamp journal->j_sb_buffer = NULL; 1169470decc6SDave Kleikamp } 1170470decc6SDave Kleikamp 1171470decc6SDave Kleikamp /* 1172470decc6SDave Kleikamp * Given a journal_t structure, initialise the various fields for 1173470decc6SDave Kleikamp * startup of a new journaling session. We use this both when creating 1174470decc6SDave Kleikamp * a journal, and after recovering an old journal to reset it for 1175470decc6SDave Kleikamp * subsequent use. 1176470decc6SDave Kleikamp */ 1177470decc6SDave Kleikamp 1178470decc6SDave Kleikamp static int journal_reset(journal_t *journal) 1179470decc6SDave Kleikamp { 1180470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 118118eba7aaSMingming Cao unsigned long long first, last; 1182470decc6SDave Kleikamp 1183470decc6SDave Kleikamp first = be32_to_cpu(sb->s_first); 1184470decc6SDave Kleikamp last = be32_to_cpu(sb->s_maxlen); 1185f6f50e28SJan Kara if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { 1186f2a44523SEryu Guan printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu).\n", 1187f6f50e28SJan Kara first, last); 1188f6f50e28SJan Kara journal_fail_superblock(journal); 1189f6f50e28SJan Kara return -EINVAL; 1190f6f50e28SJan Kara } 1191470decc6SDave Kleikamp 1192470decc6SDave Kleikamp journal->j_first = first; 1193470decc6SDave Kleikamp journal->j_last = last; 1194470decc6SDave Kleikamp 1195470decc6SDave Kleikamp journal->j_head = first; 1196470decc6SDave Kleikamp journal->j_tail = first; 1197470decc6SDave Kleikamp journal->j_free = last - first; 1198470decc6SDave Kleikamp 1199470decc6SDave Kleikamp journal->j_tail_sequence = journal->j_transaction_sequence; 1200470decc6SDave Kleikamp journal->j_commit_sequence = journal->j_transaction_sequence - 1; 1201470decc6SDave Kleikamp journal->j_commit_request = journal->j_commit_sequence; 1202470decc6SDave Kleikamp 1203470decc6SDave Kleikamp journal->j_max_transaction_buffers = journal->j_maxlen / 4; 1204470decc6SDave Kleikamp 1205470decc6SDave Kleikamp /* 1206470decc6SDave Kleikamp * As a special case, if the on-disk copy is already marked as needing 120724bcc89cSJan Kara * no recovery (s_start == 0), then we can safely defer the superblock 120824bcc89cSJan Kara * update until the next commit by setting JBD2_FLUSHED. This avoids 1209470decc6SDave Kleikamp * attempting a write to a potential-readonly device. 1210470decc6SDave Kleikamp */ 121124bcc89cSJan Kara if (sb->s_start == 0) { 1212f2a44523SEryu Guan jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " 1213470decc6SDave Kleikamp "(start %ld, seq %d, errno %d)\n", 1214470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, 1215470decc6SDave Kleikamp journal->j_errno); 121624bcc89cSJan Kara journal->j_flags |= JBD2_FLUSHED; 121724bcc89cSJan Kara } else { 1218a78bb11dSJan Kara /* Lock here to make assertions happy... */ 1219a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 122079feb521SJan Kara /* 122179feb521SJan Kara * Update log tail information. We use WRITE_FUA since new 122279feb521SJan Kara * transaction will start reusing journal space and so we 122379feb521SJan Kara * must make sure information about current log tail is on 122479feb521SJan Kara * disk before that. 122579feb521SJan Kara */ 122679feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, 122779feb521SJan Kara journal->j_tail_sequence, 122879feb521SJan Kara journal->j_tail, 122979feb521SJan Kara WRITE_FUA); 1230a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 123124bcc89cSJan Kara } 123224bcc89cSJan Kara return jbd2_journal_start_thread(journal); 1233470decc6SDave Kleikamp } 1234470decc6SDave Kleikamp 123579feb521SJan Kara static void jbd2_write_superblock(journal_t *journal, int write_op) 123624bcc89cSJan Kara { 123724bcc89cSJan Kara struct buffer_head *bh = journal->j_sb_buffer; 123879feb521SJan Kara int ret; 123924bcc89cSJan Kara 124079feb521SJan Kara trace_jbd2_write_superblock(journal, write_op); 124179feb521SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 124279feb521SJan Kara write_op &= ~(REQ_FUA | REQ_FLUSH); 124379feb521SJan Kara lock_buffer(bh); 1244914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1245914258bfSTheodore Ts'o /* 1246914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the journal 1247914258bfSTheodore Ts'o * superblock failed. This could happen because the 1248914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 1249914258bfSTheodore Ts'o * be a transient write error and maybe the block will 1250914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 1251914258bfSTheodore Ts'o * write and hope for the best. 1252914258bfSTheodore Ts'o */ 1253914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: previous I/O error detected " 1254914258bfSTheodore Ts'o "for journal superblock update for %s.\n", 1255914258bfSTheodore Ts'o journal->j_devname); 1256914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1257914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1258914258bfSTheodore Ts'o } 125979feb521SJan Kara get_bh(bh); 126079feb521SJan Kara bh->b_end_io = end_buffer_write_sync; 126179feb521SJan Kara ret = submit_bh(write_op, bh); 126279feb521SJan Kara wait_on_buffer(bh); 1263914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1264914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1265914258bfSTheodore Ts'o set_buffer_uptodate(bh); 126679feb521SJan Kara ret = -EIO; 126779feb521SJan Kara } 126879feb521SJan Kara if (ret) { 126979feb521SJan Kara printk(KERN_ERR "JBD2: Error %d detected when updating " 127079feb521SJan Kara "journal superblock for %s.\n", ret, 127179feb521SJan Kara journal->j_devname); 1272914258bfSTheodore Ts'o } 127324bcc89cSJan Kara } 1274470decc6SDave Kleikamp 127524bcc89cSJan Kara /** 127624bcc89cSJan Kara * jbd2_journal_update_sb_log_tail() - Update log tail in journal sb on disk. 127724bcc89cSJan Kara * @journal: The journal to update. 127879feb521SJan Kara * @tail_tid: TID of the new transaction at the tail of the log 127979feb521SJan Kara * @tail_block: The first block of the transaction at the tail of the log 128079feb521SJan Kara * @write_op: With which operation should we write the journal sb 128124bcc89cSJan Kara * 128224bcc89cSJan Kara * Update a journal's superblock information about log tail and write it to 128324bcc89cSJan Kara * disk, waiting for the IO to complete. 128424bcc89cSJan Kara */ 128579feb521SJan Kara void jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid, 128679feb521SJan Kara unsigned long tail_block, int write_op) 128724bcc89cSJan Kara { 128824bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 12892201c590SSeiji Aguchi 1290a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 129179feb521SJan Kara jbd_debug(1, "JBD2: updating superblock (start %lu, seq %u)\n", 129279feb521SJan Kara tail_block, tail_tid); 1293470decc6SDave Kleikamp 129479feb521SJan Kara sb->s_sequence = cpu_to_be32(tail_tid); 129579feb521SJan Kara sb->s_start = cpu_to_be32(tail_block); 129624bcc89cSJan Kara 129779feb521SJan Kara jbd2_write_superblock(journal, write_op); 129824bcc89cSJan Kara 129924bcc89cSJan Kara /* Log is no longer empty */ 1300a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 130124bcc89cSJan Kara WARN_ON(!sb->s_sequence); 1302f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_FLUSHED; 130324bcc89cSJan Kara write_unlock(&journal->j_state_lock); 130424bcc89cSJan Kara } 130524bcc89cSJan Kara 130624bcc89cSJan Kara /** 130724bcc89cSJan Kara * jbd2_mark_journal_empty() - Mark on disk journal as empty. 130824bcc89cSJan Kara * @journal: The journal to update. 130924bcc89cSJan Kara * 131024bcc89cSJan Kara * Update a journal's dynamic superblock fields to show that journal is empty. 131124bcc89cSJan Kara * Write updated superblock to disk waiting for IO to complete. 131224bcc89cSJan Kara */ 131324bcc89cSJan Kara static void jbd2_mark_journal_empty(journal_t *journal) 131424bcc89cSJan Kara { 131524bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 131624bcc89cSJan Kara 1317a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 131824bcc89cSJan Kara read_lock(&journal->j_state_lock); 131924bcc89cSJan Kara jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n", 132024bcc89cSJan Kara journal->j_tail_sequence); 132124bcc89cSJan Kara 132224bcc89cSJan Kara sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 132324bcc89cSJan Kara sb->s_start = cpu_to_be32(0); 132424bcc89cSJan Kara read_unlock(&journal->j_state_lock); 132524bcc89cSJan Kara 132679feb521SJan Kara jbd2_write_superblock(journal, WRITE_FUA); 132724bcc89cSJan Kara 132824bcc89cSJan Kara /* Log is no longer empty */ 132924bcc89cSJan Kara write_lock(&journal->j_state_lock); 1330f7f4bccbSMingming Cao journal->j_flags |= JBD2_FLUSHED; 1331a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1332470decc6SDave Kleikamp } 1333470decc6SDave Kleikamp 133424bcc89cSJan Kara 133524bcc89cSJan Kara /** 133624bcc89cSJan Kara * jbd2_journal_update_sb_errno() - Update error in the journal. 133724bcc89cSJan Kara * @journal: The journal to update. 133824bcc89cSJan Kara * 133924bcc89cSJan Kara * Update a journal's errno. Write updated superblock to disk waiting for IO 134024bcc89cSJan Kara * to complete. 134124bcc89cSJan Kara */ 134224bcc89cSJan Kara static void jbd2_journal_update_sb_errno(journal_t *journal) 134324bcc89cSJan Kara { 134424bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 134524bcc89cSJan Kara 134624bcc89cSJan Kara read_lock(&journal->j_state_lock); 134724bcc89cSJan Kara jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", 134824bcc89cSJan Kara journal->j_errno); 134924bcc89cSJan Kara sb->s_errno = cpu_to_be32(journal->j_errno); 135024bcc89cSJan Kara read_unlock(&journal->j_state_lock); 135124bcc89cSJan Kara 135279feb521SJan Kara jbd2_write_superblock(journal, WRITE_SYNC); 135324bcc89cSJan Kara } 135424bcc89cSJan Kara 1355470decc6SDave Kleikamp /* 1356470decc6SDave Kleikamp * Read the superblock for a given journal, performing initial 1357470decc6SDave Kleikamp * validation of the format. 1358470decc6SDave Kleikamp */ 1359470decc6SDave Kleikamp static int journal_get_superblock(journal_t *journal) 1360470decc6SDave Kleikamp { 1361470decc6SDave Kleikamp struct buffer_head *bh; 1362470decc6SDave Kleikamp journal_superblock_t *sb; 1363470decc6SDave Kleikamp int err = -EIO; 1364470decc6SDave Kleikamp 1365470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1366470decc6SDave Kleikamp 1367470decc6SDave Kleikamp J_ASSERT(bh != NULL); 1368470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1369470decc6SDave Kleikamp ll_rw_block(READ, 1, &bh); 1370470decc6SDave Kleikamp wait_on_buffer(bh); 1371470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1372470decc6SDave Kleikamp printk(KERN_ERR 1373f2a44523SEryu Guan "JBD2: IO error reading journal superblock\n"); 1374470decc6SDave Kleikamp goto out; 1375470decc6SDave Kleikamp } 1376470decc6SDave Kleikamp } 1377470decc6SDave Kleikamp 1378470decc6SDave Kleikamp sb = journal->j_superblock; 1379470decc6SDave Kleikamp 1380470decc6SDave Kleikamp err = -EINVAL; 1381470decc6SDave Kleikamp 1382f7f4bccbSMingming Cao if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || 1383470decc6SDave Kleikamp sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { 1384f2a44523SEryu Guan printk(KERN_WARNING "JBD2: no valid journal superblock found\n"); 1385470decc6SDave Kleikamp goto out; 1386470decc6SDave Kleikamp } 1387470decc6SDave Kleikamp 1388470decc6SDave Kleikamp switch(be32_to_cpu(sb->s_header.h_blocktype)) { 1389f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1390470decc6SDave Kleikamp journal->j_format_version = 1; 1391470decc6SDave Kleikamp break; 1392f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1393470decc6SDave Kleikamp journal->j_format_version = 2; 1394470decc6SDave Kleikamp break; 1395470decc6SDave Kleikamp default: 1396f2a44523SEryu Guan printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n"); 1397470decc6SDave Kleikamp goto out; 1398470decc6SDave Kleikamp } 1399470decc6SDave Kleikamp 1400470decc6SDave Kleikamp if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) 1401470decc6SDave Kleikamp journal->j_maxlen = be32_to_cpu(sb->s_maxlen); 1402470decc6SDave Kleikamp else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { 1403f2a44523SEryu Guan printk(KERN_WARNING "JBD2: journal file too short\n"); 1404470decc6SDave Kleikamp goto out; 1405470decc6SDave Kleikamp } 1406470decc6SDave Kleikamp 14078762202dSEryu Guan if (be32_to_cpu(sb->s_first) == 0 || 14088762202dSEryu Guan be32_to_cpu(sb->s_first) >= journal->j_maxlen) { 14098762202dSEryu Guan printk(KERN_WARNING 14108762202dSEryu Guan "JBD2: Invalid start block of journal: %u\n", 14118762202dSEryu Guan be32_to_cpu(sb->s_first)); 14128762202dSEryu Guan goto out; 14138762202dSEryu Guan } 14148762202dSEryu Guan 1415470decc6SDave Kleikamp return 0; 1416470decc6SDave Kleikamp 1417470decc6SDave Kleikamp out: 1418470decc6SDave Kleikamp journal_fail_superblock(journal); 1419470decc6SDave Kleikamp return err; 1420470decc6SDave Kleikamp } 1421470decc6SDave Kleikamp 1422470decc6SDave Kleikamp /* 1423470decc6SDave Kleikamp * Load the on-disk journal superblock and read the key fields into the 1424470decc6SDave Kleikamp * journal_t. 1425470decc6SDave Kleikamp */ 1426470decc6SDave Kleikamp 1427470decc6SDave Kleikamp static int load_superblock(journal_t *journal) 1428470decc6SDave Kleikamp { 1429470decc6SDave Kleikamp int err; 1430470decc6SDave Kleikamp journal_superblock_t *sb; 1431470decc6SDave Kleikamp 1432470decc6SDave Kleikamp err = journal_get_superblock(journal); 1433470decc6SDave Kleikamp if (err) 1434470decc6SDave Kleikamp return err; 1435470decc6SDave Kleikamp 1436470decc6SDave Kleikamp sb = journal->j_superblock; 1437470decc6SDave Kleikamp 1438470decc6SDave Kleikamp journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); 1439470decc6SDave Kleikamp journal->j_tail = be32_to_cpu(sb->s_start); 1440470decc6SDave Kleikamp journal->j_first = be32_to_cpu(sb->s_first); 1441470decc6SDave Kleikamp journal->j_last = be32_to_cpu(sb->s_maxlen); 1442470decc6SDave Kleikamp journal->j_errno = be32_to_cpu(sb->s_errno); 1443470decc6SDave Kleikamp 1444470decc6SDave Kleikamp return 0; 1445470decc6SDave Kleikamp } 1446470decc6SDave Kleikamp 1447470decc6SDave Kleikamp 1448470decc6SDave Kleikamp /** 1449f7f4bccbSMingming Cao * int jbd2_journal_load() - Read journal from disk. 1450470decc6SDave Kleikamp * @journal: Journal to act on. 1451470decc6SDave Kleikamp * 1452470decc6SDave Kleikamp * Given a journal_t structure which tells us which disk blocks contain 1453470decc6SDave Kleikamp * a journal, read the journal from disk to initialise the in-memory 1454470decc6SDave Kleikamp * structures. 1455470decc6SDave Kleikamp */ 1456f7f4bccbSMingming Cao int jbd2_journal_load(journal_t *journal) 1457470decc6SDave Kleikamp { 1458470decc6SDave Kleikamp int err; 1459470decc6SDave Kleikamp journal_superblock_t *sb; 1460470decc6SDave Kleikamp 1461470decc6SDave Kleikamp err = load_superblock(journal); 1462470decc6SDave Kleikamp if (err) 1463470decc6SDave Kleikamp return err; 1464470decc6SDave Kleikamp 1465470decc6SDave Kleikamp sb = journal->j_superblock; 1466470decc6SDave Kleikamp /* If this is a V2 superblock, then we have to check the 1467470decc6SDave Kleikamp * features flags on it. */ 1468470decc6SDave Kleikamp 1469470decc6SDave Kleikamp if (journal->j_format_version >= 2) { 1470470decc6SDave Kleikamp if ((sb->s_feature_ro_compat & 1471f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || 1472470decc6SDave Kleikamp (sb->s_feature_incompat & 1473f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { 1474470decc6SDave Kleikamp printk(KERN_WARNING 1475f2a44523SEryu Guan "JBD2: Unrecognised features on journal\n"); 1476470decc6SDave Kleikamp return -EINVAL; 1477470decc6SDave Kleikamp } 1478470decc6SDave Kleikamp } 1479470decc6SDave Kleikamp 1480d2eecb03STheodore Ts'o /* 1481d2eecb03STheodore Ts'o * Create a slab for this blocksize 1482d2eecb03STheodore Ts'o */ 1483d2eecb03STheodore Ts'o err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); 1484d2eecb03STheodore Ts'o if (err) 1485d2eecb03STheodore Ts'o return err; 1486d2eecb03STheodore Ts'o 1487470decc6SDave Kleikamp /* Let the recovery code check whether it needs to recover any 1488470decc6SDave Kleikamp * data from the journal. */ 1489f7f4bccbSMingming Cao if (jbd2_journal_recover(journal)) 1490470decc6SDave Kleikamp goto recovery_error; 1491470decc6SDave Kleikamp 1492e6a47428STheodore Ts'o if (journal->j_failed_commit) { 1493e6a47428STheodore Ts'o printk(KERN_ERR "JBD2: journal transaction %u on %s " 1494e6a47428STheodore Ts'o "is corrupt.\n", journal->j_failed_commit, 1495e6a47428STheodore Ts'o journal->j_devname); 1496e6a47428STheodore Ts'o return -EIO; 1497e6a47428STheodore Ts'o } 1498e6a47428STheodore Ts'o 1499470decc6SDave Kleikamp /* OK, we've finished with the dynamic journal bits: 1500470decc6SDave Kleikamp * reinitialise the dynamic contents of the superblock in memory 1501470decc6SDave Kleikamp * and reset them on disk. */ 1502470decc6SDave Kleikamp if (journal_reset(journal)) 1503470decc6SDave Kleikamp goto recovery_error; 1504470decc6SDave Kleikamp 1505f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_ABORT; 1506f7f4bccbSMingming Cao journal->j_flags |= JBD2_LOADED; 1507470decc6SDave Kleikamp return 0; 1508470decc6SDave Kleikamp 1509470decc6SDave Kleikamp recovery_error: 1510f2a44523SEryu Guan printk(KERN_WARNING "JBD2: recovery failed\n"); 1511470decc6SDave Kleikamp return -EIO; 1512470decc6SDave Kleikamp } 1513470decc6SDave Kleikamp 1514470decc6SDave Kleikamp /** 1515f7f4bccbSMingming Cao * void jbd2_journal_destroy() - Release a journal_t structure. 1516470decc6SDave Kleikamp * @journal: Journal to act on. 1517470decc6SDave Kleikamp * 1518470decc6SDave Kleikamp * Release a journal_t structure once it is no longer in use by the 1519470decc6SDave Kleikamp * journaled object. 152044519fafSHidehiro Kawai * Return <0 if we couldn't clean up the journal. 1521470decc6SDave Kleikamp */ 152244519fafSHidehiro Kawai int jbd2_journal_destroy(journal_t *journal) 1523470decc6SDave Kleikamp { 152444519fafSHidehiro Kawai int err = 0; 152544519fafSHidehiro Kawai 1526470decc6SDave Kleikamp /* Wait for the commit thread to wake up and die. */ 1527470decc6SDave Kleikamp journal_kill_thread(journal); 1528470decc6SDave Kleikamp 1529470decc6SDave Kleikamp /* Force a final log commit */ 1530470decc6SDave Kleikamp if (journal->j_running_transaction) 1531f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 1532470decc6SDave Kleikamp 1533470decc6SDave Kleikamp /* Force any old transactions to disk */ 1534470decc6SDave Kleikamp 1535470decc6SDave Kleikamp /* Totally anal locking here... */ 1536470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1537470decc6SDave Kleikamp while (journal->j_checkpoint_transactions != NULL) { 1538470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 15391a0d3786STheodore Ts'o mutex_lock(&journal->j_checkpoint_mutex); 1540f7f4bccbSMingming Cao jbd2_log_do_checkpoint(journal); 15411a0d3786STheodore Ts'o mutex_unlock(&journal->j_checkpoint_mutex); 1542470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1543470decc6SDave Kleikamp } 1544470decc6SDave Kleikamp 1545470decc6SDave Kleikamp J_ASSERT(journal->j_running_transaction == NULL); 1546470decc6SDave Kleikamp J_ASSERT(journal->j_committing_transaction == NULL); 1547470decc6SDave Kleikamp J_ASSERT(journal->j_checkpoint_transactions == NULL); 1548470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 1549470decc6SDave Kleikamp 155044519fafSHidehiro Kawai if (journal->j_sb_buffer) { 1551a78bb11dSJan Kara if (!is_journal_aborted(journal)) { 1552a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 155324bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1554a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1555a78bb11dSJan Kara } else 155644519fafSHidehiro Kawai err = -EIO; 1557470decc6SDave Kleikamp brelse(journal->j_sb_buffer); 1558470decc6SDave Kleikamp } 1559470decc6SDave Kleikamp 15608e85fb3fSJohann Lombardi if (journal->j_proc_entry) 15618e85fb3fSJohann Lombardi jbd2_stats_proc_exit(journal); 1562470decc6SDave Kleikamp if (journal->j_inode) 1563470decc6SDave Kleikamp iput(journal->j_inode); 1564470decc6SDave Kleikamp if (journal->j_revoke) 1565f7f4bccbSMingming Cao jbd2_journal_destroy_revoke(journal); 1566470decc6SDave Kleikamp kfree(journal->j_wbuf); 1567470decc6SDave Kleikamp kfree(journal); 156844519fafSHidehiro Kawai 156944519fafSHidehiro Kawai return err; 1570470decc6SDave Kleikamp } 1571470decc6SDave Kleikamp 1572470decc6SDave Kleikamp 1573470decc6SDave Kleikamp /** 1574f7f4bccbSMingming Cao *int jbd2_journal_check_used_features () - Check if features specified are used. 1575470decc6SDave Kleikamp * @journal: Journal to check. 1576470decc6SDave Kleikamp * @compat: bitmask of compatible features 1577470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1578470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1579470decc6SDave Kleikamp * 1580470decc6SDave Kleikamp * Check whether the journal uses all of a given set of 1581470decc6SDave Kleikamp * features. Return true (non-zero) if it does. 1582470decc6SDave Kleikamp **/ 1583470decc6SDave Kleikamp 1584f7f4bccbSMingming Cao int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, 1585470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1586470decc6SDave Kleikamp { 1587470decc6SDave Kleikamp journal_superblock_t *sb; 1588470decc6SDave Kleikamp 1589470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1590470decc6SDave Kleikamp return 1; 15911113e1b5SPatrick J. LoPresti /* Load journal superblock if it is not loaded yet. */ 15921113e1b5SPatrick J. LoPresti if (journal->j_format_version == 0 && 15931113e1b5SPatrick J. LoPresti journal_get_superblock(journal) != 0) 15941113e1b5SPatrick J. LoPresti return 0; 1595470decc6SDave Kleikamp if (journal->j_format_version == 1) 1596470decc6SDave Kleikamp return 0; 1597470decc6SDave Kleikamp 1598470decc6SDave Kleikamp sb = journal->j_superblock; 1599470decc6SDave Kleikamp 1600470decc6SDave Kleikamp if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && 1601470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && 1602470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) 1603470decc6SDave Kleikamp return 1; 1604470decc6SDave Kleikamp 1605470decc6SDave Kleikamp return 0; 1606470decc6SDave Kleikamp } 1607470decc6SDave Kleikamp 1608470decc6SDave Kleikamp /** 1609f7f4bccbSMingming Cao * int jbd2_journal_check_available_features() - Check feature set in journalling layer 1610470decc6SDave Kleikamp * @journal: Journal to check. 1611470decc6SDave Kleikamp * @compat: bitmask of compatible features 1612470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1613470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1614470decc6SDave Kleikamp * 1615470decc6SDave Kleikamp * Check whether the journaling code supports the use of 1616470decc6SDave Kleikamp * all of a given set of features on this journal. Return true 1617470decc6SDave Kleikamp * (non-zero) if it can. */ 1618470decc6SDave Kleikamp 1619f7f4bccbSMingming Cao int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, 1620470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1621470decc6SDave Kleikamp { 1622470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1623470decc6SDave Kleikamp return 1; 1624470decc6SDave Kleikamp 1625470decc6SDave Kleikamp /* We can support any known requested features iff the 1626470decc6SDave Kleikamp * superblock is in version 2. Otherwise we fail to support any 1627470decc6SDave Kleikamp * extended sb features. */ 1628470decc6SDave Kleikamp 1629470decc6SDave Kleikamp if (journal->j_format_version != 2) 1630470decc6SDave Kleikamp return 0; 1631470decc6SDave Kleikamp 1632f7f4bccbSMingming Cao if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && 1633f7f4bccbSMingming Cao (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && 1634f7f4bccbSMingming Cao (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) 1635470decc6SDave Kleikamp return 1; 1636470decc6SDave Kleikamp 1637470decc6SDave Kleikamp return 0; 1638470decc6SDave Kleikamp } 1639470decc6SDave Kleikamp 1640470decc6SDave Kleikamp /** 1641f7f4bccbSMingming Cao * int jbd2_journal_set_features () - Mark a given journal feature in the superblock 1642470decc6SDave Kleikamp * @journal: Journal to act on. 1643470decc6SDave Kleikamp * @compat: bitmask of compatible features 1644470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1645470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1646470decc6SDave Kleikamp * 1647470decc6SDave Kleikamp * Mark a given journal feature as present on the 1648470decc6SDave Kleikamp * superblock. Returns true if the requested features could be set. 1649470decc6SDave Kleikamp * 1650470decc6SDave Kleikamp */ 1651470decc6SDave Kleikamp 1652f7f4bccbSMingming Cao int jbd2_journal_set_features (journal_t *journal, unsigned long compat, 1653470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1654470decc6SDave Kleikamp { 1655470decc6SDave Kleikamp journal_superblock_t *sb; 1656470decc6SDave Kleikamp 1657f7f4bccbSMingming Cao if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) 1658470decc6SDave Kleikamp return 1; 1659470decc6SDave Kleikamp 1660f7f4bccbSMingming Cao if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) 1661470decc6SDave Kleikamp return 0; 1662470decc6SDave Kleikamp 1663470decc6SDave Kleikamp jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", 1664470decc6SDave Kleikamp compat, ro, incompat); 1665470decc6SDave Kleikamp 1666470decc6SDave Kleikamp sb = journal->j_superblock; 1667470decc6SDave Kleikamp 1668470decc6SDave Kleikamp sb->s_feature_compat |= cpu_to_be32(compat); 1669470decc6SDave Kleikamp sb->s_feature_ro_compat |= cpu_to_be32(ro); 1670470decc6SDave Kleikamp sb->s_feature_incompat |= cpu_to_be32(incompat); 1671470decc6SDave Kleikamp 1672470decc6SDave Kleikamp return 1; 1673470decc6SDave Kleikamp } 1674470decc6SDave Kleikamp 1675818d276cSGirish Shilamkar /* 1676818d276cSGirish Shilamkar * jbd2_journal_clear_features () - Clear a given journal feature in the 1677818d276cSGirish Shilamkar * superblock 1678818d276cSGirish Shilamkar * @journal: Journal to act on. 1679818d276cSGirish Shilamkar * @compat: bitmask of compatible features 1680818d276cSGirish Shilamkar * @ro: bitmask of features that force read-only mount 1681818d276cSGirish Shilamkar * @incompat: bitmask of incompatible features 1682818d276cSGirish Shilamkar * 1683818d276cSGirish Shilamkar * Clear a given journal feature as present on the 1684818d276cSGirish Shilamkar * superblock. 1685818d276cSGirish Shilamkar */ 1686818d276cSGirish Shilamkar void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, 1687818d276cSGirish Shilamkar unsigned long ro, unsigned long incompat) 1688818d276cSGirish Shilamkar { 1689818d276cSGirish Shilamkar journal_superblock_t *sb; 1690818d276cSGirish Shilamkar 1691818d276cSGirish Shilamkar jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", 1692818d276cSGirish Shilamkar compat, ro, incompat); 1693818d276cSGirish Shilamkar 1694818d276cSGirish Shilamkar sb = journal->j_superblock; 1695818d276cSGirish Shilamkar 1696818d276cSGirish Shilamkar sb->s_feature_compat &= ~cpu_to_be32(compat); 1697818d276cSGirish Shilamkar sb->s_feature_ro_compat &= ~cpu_to_be32(ro); 1698818d276cSGirish Shilamkar sb->s_feature_incompat &= ~cpu_to_be32(incompat); 1699818d276cSGirish Shilamkar } 1700818d276cSGirish Shilamkar EXPORT_SYMBOL(jbd2_journal_clear_features); 1701470decc6SDave Kleikamp 1702470decc6SDave Kleikamp /** 1703f7f4bccbSMingming Cao * int jbd2_journal_flush () - Flush journal 1704470decc6SDave Kleikamp * @journal: Journal to act on. 1705470decc6SDave Kleikamp * 1706470decc6SDave Kleikamp * Flush all data for a given journal to disk and empty the journal. 1707470decc6SDave Kleikamp * Filesystems can use this when remounting readonly to ensure that 1708470decc6SDave Kleikamp * recovery does not need to happen on remount. 1709470decc6SDave Kleikamp */ 1710470decc6SDave Kleikamp 1711f7f4bccbSMingming Cao int jbd2_journal_flush(journal_t *journal) 1712470decc6SDave Kleikamp { 1713470decc6SDave Kleikamp int err = 0; 1714470decc6SDave Kleikamp transaction_t *transaction = NULL; 1715470decc6SDave Kleikamp 1716a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1717470decc6SDave Kleikamp 1718470decc6SDave Kleikamp /* Force everything buffered to the log... */ 1719470decc6SDave Kleikamp if (journal->j_running_transaction) { 1720470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1721f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1722470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 1723470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 1724470decc6SDave Kleikamp 1725470decc6SDave Kleikamp /* Wait for the log commit to complete... */ 1726470decc6SDave Kleikamp if (transaction) { 1727470decc6SDave Kleikamp tid_t tid = transaction->t_tid; 1728470decc6SDave Kleikamp 1729a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1730f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 1731470decc6SDave Kleikamp } else { 1732a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1733470decc6SDave Kleikamp } 1734470decc6SDave Kleikamp 1735470decc6SDave Kleikamp /* ...and flush everything in the log out to disk. */ 1736470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1737470decc6SDave Kleikamp while (!err && journal->j_checkpoint_transactions != NULL) { 1738470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 173944519fafSHidehiro Kawai mutex_lock(&journal->j_checkpoint_mutex); 1740f7f4bccbSMingming Cao err = jbd2_log_do_checkpoint(journal); 174144519fafSHidehiro Kawai mutex_unlock(&journal->j_checkpoint_mutex); 1742470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1743470decc6SDave Kleikamp } 1744470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 174544519fafSHidehiro Kawai 174644519fafSHidehiro Kawai if (is_journal_aborted(journal)) 174744519fafSHidehiro Kawai return -EIO; 174844519fafSHidehiro Kawai 1749a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 1750f7f4bccbSMingming Cao jbd2_cleanup_journal_tail(journal); 1751470decc6SDave Kleikamp 1752470decc6SDave Kleikamp /* Finally, mark the journal as really needing no recovery. 1753470decc6SDave Kleikamp * This sets s_start==0 in the underlying superblock, which is 1754470decc6SDave Kleikamp * the magic code for a fully-recovered superblock. Any future 1755470decc6SDave Kleikamp * commits of data to the journal will restore the current 1756470decc6SDave Kleikamp * s_start value. */ 175724bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1758a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1759a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1760470decc6SDave Kleikamp J_ASSERT(!journal->j_running_transaction); 1761470decc6SDave Kleikamp J_ASSERT(!journal->j_committing_transaction); 1762470decc6SDave Kleikamp J_ASSERT(!journal->j_checkpoint_transactions); 1763470decc6SDave Kleikamp J_ASSERT(journal->j_head == journal->j_tail); 1764470decc6SDave Kleikamp J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); 1765a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 176644519fafSHidehiro Kawai return 0; 1767470decc6SDave Kleikamp } 1768470decc6SDave Kleikamp 1769470decc6SDave Kleikamp /** 1770f7f4bccbSMingming Cao * int jbd2_journal_wipe() - Wipe journal contents 1771470decc6SDave Kleikamp * @journal: Journal to act on. 1772470decc6SDave Kleikamp * @write: flag (see below) 1773470decc6SDave Kleikamp * 1774470decc6SDave Kleikamp * Wipe out all of the contents of a journal, safely. This will produce 1775470decc6SDave Kleikamp * a warning if the journal contains any valid recovery information. 1776f7f4bccbSMingming Cao * Must be called between journal_init_*() and jbd2_journal_load(). 1777470decc6SDave Kleikamp * 1778470decc6SDave Kleikamp * If 'write' is non-zero, then we wipe out the journal on disk; otherwise 1779470decc6SDave Kleikamp * we merely suppress recovery. 1780470decc6SDave Kleikamp */ 1781470decc6SDave Kleikamp 1782f7f4bccbSMingming Cao int jbd2_journal_wipe(journal_t *journal, int write) 1783470decc6SDave Kleikamp { 1784470decc6SDave Kleikamp int err = 0; 1785470decc6SDave Kleikamp 1786f7f4bccbSMingming Cao J_ASSERT (!(journal->j_flags & JBD2_LOADED)); 1787470decc6SDave Kleikamp 1788470decc6SDave Kleikamp err = load_superblock(journal); 1789470decc6SDave Kleikamp if (err) 1790470decc6SDave Kleikamp return err; 1791470decc6SDave Kleikamp 1792470decc6SDave Kleikamp if (!journal->j_tail) 1793470decc6SDave Kleikamp goto no_recovery; 1794470decc6SDave Kleikamp 1795f2a44523SEryu Guan printk(KERN_WARNING "JBD2: %s recovery information on journal\n", 1796470decc6SDave Kleikamp write ? "Clearing" : "Ignoring"); 1797470decc6SDave Kleikamp 1798f7f4bccbSMingming Cao err = jbd2_journal_skip_recovery(journal); 1799a78bb11dSJan Kara if (write) { 1800a78bb11dSJan Kara /* Lock to make assertions happy... */ 1801a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 180224bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1803a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1804a78bb11dSJan Kara } 1805470decc6SDave Kleikamp 1806470decc6SDave Kleikamp no_recovery: 1807470decc6SDave Kleikamp return err; 1808470decc6SDave Kleikamp } 1809470decc6SDave Kleikamp 1810470decc6SDave Kleikamp /* 1811470decc6SDave Kleikamp * Journal abort has very specific semantics, which we describe 1812470decc6SDave Kleikamp * for journal abort. 1813470decc6SDave Kleikamp * 1814bfcd3555SAlberto Bertogli * Two internal functions, which provide abort to the jbd layer 1815470decc6SDave Kleikamp * itself are here. 1816470decc6SDave Kleikamp */ 1817470decc6SDave Kleikamp 1818470decc6SDave Kleikamp /* 1819470decc6SDave Kleikamp * Quick version for internal journal use (doesn't lock the journal). 1820470decc6SDave Kleikamp * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, 1821470decc6SDave Kleikamp * and don't attempt to make any other journal updates. 1822470decc6SDave Kleikamp */ 1823f7f4bccbSMingming Cao void __jbd2_journal_abort_hard(journal_t *journal) 1824470decc6SDave Kleikamp { 1825470decc6SDave Kleikamp transaction_t *transaction; 1826470decc6SDave Kleikamp 1827f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1828470decc6SDave Kleikamp return; 1829470decc6SDave Kleikamp 1830470decc6SDave Kleikamp printk(KERN_ERR "Aborting journal on device %s.\n", 183105496769STheodore Ts'o journal->j_devname); 1832470decc6SDave Kleikamp 1833a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1834f7f4bccbSMingming Cao journal->j_flags |= JBD2_ABORT; 1835470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1836470decc6SDave Kleikamp if (transaction) 1837f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1838a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1839470decc6SDave Kleikamp } 1840470decc6SDave Kleikamp 1841470decc6SDave Kleikamp /* Soft abort: record the abort error status in the journal superblock, 1842470decc6SDave Kleikamp * but don't do any other IO. */ 1843470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno) 1844470decc6SDave Kleikamp { 1845f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1846470decc6SDave Kleikamp return; 1847470decc6SDave Kleikamp 1848470decc6SDave Kleikamp if (!journal->j_errno) 1849470decc6SDave Kleikamp journal->j_errno = errno; 1850470decc6SDave Kleikamp 1851f7f4bccbSMingming Cao __jbd2_journal_abort_hard(journal); 1852470decc6SDave Kleikamp 1853470decc6SDave Kleikamp if (errno) 185424bcc89cSJan Kara jbd2_journal_update_sb_errno(journal); 1855470decc6SDave Kleikamp } 1856470decc6SDave Kleikamp 1857470decc6SDave Kleikamp /** 1858f7f4bccbSMingming Cao * void jbd2_journal_abort () - Shutdown the journal immediately. 1859470decc6SDave Kleikamp * @journal: the journal to shutdown. 1860470decc6SDave Kleikamp * @errno: an error number to record in the journal indicating 1861470decc6SDave Kleikamp * the reason for the shutdown. 1862470decc6SDave Kleikamp * 1863470decc6SDave Kleikamp * Perform a complete, immediate shutdown of the ENTIRE 1864470decc6SDave Kleikamp * journal (not of a single transaction). This operation cannot be 1865470decc6SDave Kleikamp * undone without closing and reopening the journal. 1866470decc6SDave Kleikamp * 1867f7f4bccbSMingming Cao * The jbd2_journal_abort function is intended to support higher level error 1868470decc6SDave Kleikamp * recovery mechanisms such as the ext2/ext3 remount-readonly error 1869470decc6SDave Kleikamp * mode. 1870470decc6SDave Kleikamp * 1871470decc6SDave Kleikamp * Journal abort has very specific semantics. Any existing dirty, 1872470decc6SDave Kleikamp * unjournaled buffers in the main filesystem will still be written to 1873470decc6SDave Kleikamp * disk by bdflush, but the journaling mechanism will be suspended 1874470decc6SDave Kleikamp * immediately and no further transaction commits will be honoured. 1875470decc6SDave Kleikamp * 1876470decc6SDave Kleikamp * Any dirty, journaled buffers will be written back to disk without 1877470decc6SDave Kleikamp * hitting the journal. Atomicity cannot be guaranteed on an aborted 1878470decc6SDave Kleikamp * filesystem, but we _do_ attempt to leave as much data as possible 1879470decc6SDave Kleikamp * behind for fsck to use for cleanup. 1880470decc6SDave Kleikamp * 1881470decc6SDave Kleikamp * Any attempt to get a new transaction handle on a journal which is in 1882470decc6SDave Kleikamp * ABORT state will just result in an -EROFS error return. A 1883f7f4bccbSMingming Cao * jbd2_journal_stop on an existing handle will return -EIO if we have 1884470decc6SDave Kleikamp * entered abort state during the update. 1885470decc6SDave Kleikamp * 1886470decc6SDave Kleikamp * Recursive transactions are not disturbed by journal abort until the 1887f7f4bccbSMingming Cao * final jbd2_journal_stop, which will receive the -EIO error. 1888470decc6SDave Kleikamp * 1889f7f4bccbSMingming Cao * Finally, the jbd2_journal_abort call allows the caller to supply an errno 1890470decc6SDave Kleikamp * which will be recorded (if possible) in the journal superblock. This 1891470decc6SDave Kleikamp * allows a client to record failure conditions in the middle of a 1892470decc6SDave Kleikamp * transaction without having to complete the transaction to record the 1893470decc6SDave Kleikamp * failure to disk. ext3_error, for example, now uses this 1894470decc6SDave Kleikamp * functionality. 1895470decc6SDave Kleikamp * 1896470decc6SDave Kleikamp * Errors which originate from within the journaling layer will NOT 1897470decc6SDave Kleikamp * supply an errno; a null errno implies that absolutely no further 1898470decc6SDave Kleikamp * writes are done to the journal (unless there are any already in 1899470decc6SDave Kleikamp * progress). 1900470decc6SDave Kleikamp * 1901470decc6SDave Kleikamp */ 1902470decc6SDave Kleikamp 1903f7f4bccbSMingming Cao void jbd2_journal_abort(journal_t *journal, int errno) 1904470decc6SDave Kleikamp { 1905470decc6SDave Kleikamp __journal_abort_soft(journal, errno); 1906470decc6SDave Kleikamp } 1907470decc6SDave Kleikamp 1908470decc6SDave Kleikamp /** 1909f7f4bccbSMingming Cao * int jbd2_journal_errno () - returns the journal's error state. 1910470decc6SDave Kleikamp * @journal: journal to examine. 1911470decc6SDave Kleikamp * 1912bfcd3555SAlberto Bertogli * This is the errno number set with jbd2_journal_abort(), the last 1913470decc6SDave Kleikamp * time the journal was mounted - if the journal was stopped 1914470decc6SDave Kleikamp * without calling abort this will be 0. 1915470decc6SDave Kleikamp * 1916470decc6SDave Kleikamp * If the journal has been aborted on this mount time -EROFS will 1917470decc6SDave Kleikamp * be returned. 1918470decc6SDave Kleikamp */ 1919f7f4bccbSMingming Cao int jbd2_journal_errno(journal_t *journal) 1920470decc6SDave Kleikamp { 1921470decc6SDave Kleikamp int err; 1922470decc6SDave Kleikamp 1923a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 1924f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1925470decc6SDave Kleikamp err = -EROFS; 1926470decc6SDave Kleikamp else 1927470decc6SDave Kleikamp err = journal->j_errno; 1928a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 1929470decc6SDave Kleikamp return err; 1930470decc6SDave Kleikamp } 1931470decc6SDave Kleikamp 1932470decc6SDave Kleikamp /** 1933f7f4bccbSMingming Cao * int jbd2_journal_clear_err () - clears the journal's error state 1934470decc6SDave Kleikamp * @journal: journal to act on. 1935470decc6SDave Kleikamp * 1936bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 1937470decc6SDave Kleikamp * mode. 1938470decc6SDave Kleikamp */ 1939f7f4bccbSMingming Cao int jbd2_journal_clear_err(journal_t *journal) 1940470decc6SDave Kleikamp { 1941470decc6SDave Kleikamp int err = 0; 1942470decc6SDave Kleikamp 1943a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1944f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1945470decc6SDave Kleikamp err = -EROFS; 1946470decc6SDave Kleikamp else 1947470decc6SDave Kleikamp journal->j_errno = 0; 1948a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1949470decc6SDave Kleikamp return err; 1950470decc6SDave Kleikamp } 1951470decc6SDave Kleikamp 1952470decc6SDave Kleikamp /** 1953f7f4bccbSMingming Cao * void jbd2_journal_ack_err() - Ack journal err. 1954470decc6SDave Kleikamp * @journal: journal to act on. 1955470decc6SDave Kleikamp * 1956bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 1957470decc6SDave Kleikamp * mode. 1958470decc6SDave Kleikamp */ 1959f7f4bccbSMingming Cao void jbd2_journal_ack_err(journal_t *journal) 1960470decc6SDave Kleikamp { 1961a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1962470decc6SDave Kleikamp if (journal->j_errno) 1963f7f4bccbSMingming Cao journal->j_flags |= JBD2_ACK_ERR; 1964a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1965470decc6SDave Kleikamp } 1966470decc6SDave Kleikamp 1967f7f4bccbSMingming Cao int jbd2_journal_blocks_per_page(struct inode *inode) 1968470decc6SDave Kleikamp { 1969470decc6SDave Kleikamp return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 1970470decc6SDave Kleikamp } 1971470decc6SDave Kleikamp 1972470decc6SDave Kleikamp /* 1973b517bea1SZach Brown * helper functions to deal with 32 or 64bit block numbers. 1974b517bea1SZach Brown */ 1975b517bea1SZach Brown size_t journal_tag_bytes(journal_t *journal) 1976b517bea1SZach Brown { 1977b517bea1SZach Brown if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) 1978cd02ff0bSMingming Cao return JBD2_TAG_SIZE64; 1979b517bea1SZach Brown else 1980cd02ff0bSMingming Cao return JBD2_TAG_SIZE32; 1981b517bea1SZach Brown } 1982b517bea1SZach Brown 1983b517bea1SZach Brown /* 1984d2eecb03STheodore Ts'o * JBD memory management 1985d2eecb03STheodore Ts'o * 1986d2eecb03STheodore Ts'o * These functions are used to allocate block-sized chunks of memory 1987d2eecb03STheodore Ts'o * used for making copies of buffer_head data. Very often it will be 1988d2eecb03STheodore Ts'o * page-sized chunks of data, but sometimes it will be in 1989d2eecb03STheodore Ts'o * sub-page-size chunks. (For example, 16k pages on Power systems 1990d2eecb03STheodore Ts'o * with a 4k block file system.) For blocks smaller than a page, we 1991d2eecb03STheodore Ts'o * use a SLAB allocator. There are slab caches for each block size, 1992d2eecb03STheodore Ts'o * which are allocated at mount time, if necessary, and we only free 1993d2eecb03STheodore Ts'o * (all of) the slab caches when/if the jbd2 module is unloaded. For 1994d2eecb03STheodore Ts'o * this reason we don't need to a mutex to protect access to 1995d2eecb03STheodore Ts'o * jbd2_slab[] allocating or releasing memory; only in 1996d2eecb03STheodore Ts'o * jbd2_journal_create_slab(). 1997d2eecb03STheodore Ts'o */ 1998d2eecb03STheodore Ts'o #define JBD2_MAX_SLABS 8 1999d2eecb03STheodore Ts'o static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; 2000d2eecb03STheodore Ts'o 2001d2eecb03STheodore Ts'o static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { 2002d2eecb03STheodore Ts'o "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", 2003d2eecb03STheodore Ts'o "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" 2004d2eecb03STheodore Ts'o }; 2005d2eecb03STheodore Ts'o 2006d2eecb03STheodore Ts'o 2007d2eecb03STheodore Ts'o static void jbd2_journal_destroy_slabs(void) 2008d2eecb03STheodore Ts'o { 2009d2eecb03STheodore Ts'o int i; 2010d2eecb03STheodore Ts'o 2011d2eecb03STheodore Ts'o for (i = 0; i < JBD2_MAX_SLABS; i++) { 2012d2eecb03STheodore Ts'o if (jbd2_slab[i]) 2013d2eecb03STheodore Ts'o kmem_cache_destroy(jbd2_slab[i]); 2014d2eecb03STheodore Ts'o jbd2_slab[i] = NULL; 2015d2eecb03STheodore Ts'o } 2016d2eecb03STheodore Ts'o } 2017d2eecb03STheodore Ts'o 2018d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t size) 2019d2eecb03STheodore Ts'o { 202051dfacdeSThomas Gleixner static DEFINE_MUTEX(jbd2_slab_create_mutex); 2021d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2022d2eecb03STheodore Ts'o size_t slab_size; 2023d2eecb03STheodore Ts'o 2024d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2025d2eecb03STheodore Ts'o return 0; 2026d2eecb03STheodore Ts'o 2027d2eecb03STheodore Ts'o if (i >= JBD2_MAX_SLABS) 2028d2eecb03STheodore Ts'o return -EINVAL; 2029d2eecb03STheodore Ts'o 2030d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2031d2eecb03STheodore Ts'o i = 0; 203251dfacdeSThomas Gleixner mutex_lock(&jbd2_slab_create_mutex); 2033d2eecb03STheodore Ts'o if (jbd2_slab[i]) { 203451dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2035d2eecb03STheodore Ts'o return 0; /* Already created */ 2036d2eecb03STheodore Ts'o } 2037d2eecb03STheodore Ts'o 2038d2eecb03STheodore Ts'o slab_size = 1 << (i+10); 2039d2eecb03STheodore Ts'o jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, 2040d2eecb03STheodore Ts'o slab_size, 0, NULL); 204151dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2042d2eecb03STheodore Ts'o if (!jbd2_slab[i]) { 2043d2eecb03STheodore Ts'o printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); 2044d2eecb03STheodore Ts'o return -ENOMEM; 2045d2eecb03STheodore Ts'o } 2046d2eecb03STheodore Ts'o return 0; 2047d2eecb03STheodore Ts'o } 2048d2eecb03STheodore Ts'o 2049d2eecb03STheodore Ts'o static struct kmem_cache *get_slab(size_t size) 2050d2eecb03STheodore Ts'o { 2051d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2052d2eecb03STheodore Ts'o 2053d2eecb03STheodore Ts'o BUG_ON(i >= JBD2_MAX_SLABS); 2054d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2055d2eecb03STheodore Ts'o i = 0; 20568ac97b74SBill Pemberton BUG_ON(jbd2_slab[i] == NULL); 2057d2eecb03STheodore Ts'o return jbd2_slab[i]; 2058d2eecb03STheodore Ts'o } 2059d2eecb03STheodore Ts'o 2060d2eecb03STheodore Ts'o void *jbd2_alloc(size_t size, gfp_t flags) 2061d2eecb03STheodore Ts'o { 2062d2eecb03STheodore Ts'o void *ptr; 2063d2eecb03STheodore Ts'o 2064d2eecb03STheodore Ts'o BUG_ON(size & (size-1)); /* Must be a power of 2 */ 2065d2eecb03STheodore Ts'o 2066d2eecb03STheodore Ts'o flags |= __GFP_REPEAT; 2067d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2068d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, 0); 2069d2eecb03STheodore Ts'o else if (size > PAGE_SIZE) { 2070d2eecb03STheodore Ts'o int order = get_order(size); 2071d2eecb03STheodore Ts'o 2072d2eecb03STheodore Ts'o if (order < 3) 2073d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, order); 2074d2eecb03STheodore Ts'o else 2075d2eecb03STheodore Ts'o ptr = vmalloc(size); 2076d2eecb03STheodore Ts'o } else 2077d2eecb03STheodore Ts'o ptr = kmem_cache_alloc(get_slab(size), flags); 2078d2eecb03STheodore Ts'o 2079d2eecb03STheodore Ts'o /* Check alignment; SLUB has gotten this wrong in the past, 2080d2eecb03STheodore Ts'o * and this can lead to user data corruption! */ 2081d2eecb03STheodore Ts'o BUG_ON(((unsigned long) ptr) & (size-1)); 2082d2eecb03STheodore Ts'o 2083d2eecb03STheodore Ts'o return ptr; 2084d2eecb03STheodore Ts'o } 2085d2eecb03STheodore Ts'o 2086d2eecb03STheodore Ts'o void jbd2_free(void *ptr, size_t size) 2087d2eecb03STheodore Ts'o { 2088d2eecb03STheodore Ts'o if (size == PAGE_SIZE) { 2089d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, 0); 2090d2eecb03STheodore Ts'o return; 2091d2eecb03STheodore Ts'o } 2092d2eecb03STheodore Ts'o if (size > PAGE_SIZE) { 2093d2eecb03STheodore Ts'o int order = get_order(size); 2094d2eecb03STheodore Ts'o 2095d2eecb03STheodore Ts'o if (order < 3) 2096d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, order); 2097d2eecb03STheodore Ts'o else 2098d2eecb03STheodore Ts'o vfree(ptr); 2099d2eecb03STheodore Ts'o return; 2100d2eecb03STheodore Ts'o } 2101d2eecb03STheodore Ts'o kmem_cache_free(get_slab(size), ptr); 2102d2eecb03STheodore Ts'o }; 2103d2eecb03STheodore Ts'o 2104d2eecb03STheodore Ts'o /* 2105470decc6SDave Kleikamp * Journal_head storage management 2106470decc6SDave Kleikamp */ 2107e18b890bSChristoph Lameter static struct kmem_cache *jbd2_journal_head_cache; 2108e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2109470decc6SDave Kleikamp static atomic_t nr_journal_heads = ATOMIC_INIT(0); 2110470decc6SDave Kleikamp #endif 2111470decc6SDave Kleikamp 21124185a2acSYongqiang Yang static int jbd2_journal_init_journal_head_cache(void) 2113470decc6SDave Kleikamp { 2114470decc6SDave Kleikamp int retval; 2115470decc6SDave Kleikamp 21161076d17aSAl Viro J_ASSERT(jbd2_journal_head_cache == NULL); 2117a920e941SJohann Lombardi jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", 2118470decc6SDave Kleikamp sizeof(struct journal_head), 2119470decc6SDave Kleikamp 0, /* offset */ 212077160957SMingming Cao SLAB_TEMPORARY, /* flags */ 212120c2df83SPaul Mundt NULL); /* ctor */ 2122470decc6SDave Kleikamp retval = 0; 21231076d17aSAl Viro if (!jbd2_journal_head_cache) { 2124470decc6SDave Kleikamp retval = -ENOMEM; 2125f2a44523SEryu Guan printk(KERN_EMERG "JBD2: no memory for journal_head cache\n"); 2126470decc6SDave Kleikamp } 2127470decc6SDave Kleikamp return retval; 2128470decc6SDave Kleikamp } 2129470decc6SDave Kleikamp 21304185a2acSYongqiang Yang static void jbd2_journal_destroy_journal_head_cache(void) 2131470decc6SDave Kleikamp { 21328a9362ebSDuane Griffin if (jbd2_journal_head_cache) { 2133f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_journal_head_cache); 2134f7f4bccbSMingming Cao jbd2_journal_head_cache = NULL; 2135470decc6SDave Kleikamp } 21368a9362ebSDuane Griffin } 2137470decc6SDave Kleikamp 2138470decc6SDave Kleikamp /* 2139470decc6SDave Kleikamp * journal_head splicing and dicing 2140470decc6SDave Kleikamp */ 2141470decc6SDave Kleikamp static struct journal_head *journal_alloc_journal_head(void) 2142470decc6SDave Kleikamp { 2143470decc6SDave Kleikamp struct journal_head *ret; 2144470decc6SDave Kleikamp 2145e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2146470decc6SDave Kleikamp atomic_inc(&nr_journal_heads); 2147470decc6SDave Kleikamp #endif 2148f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 21491076d17aSAl Viro if (!ret) { 2150470decc6SDave Kleikamp jbd_debug(1, "out of memory for journal_head\n"); 2151670be5a7STheodore Ts'o pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__); 21521076d17aSAl Viro while (!ret) { 2153470decc6SDave Kleikamp yield(); 2154f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 2155470decc6SDave Kleikamp } 2156470decc6SDave Kleikamp } 2157470decc6SDave Kleikamp return ret; 2158470decc6SDave Kleikamp } 2159470decc6SDave Kleikamp 2160470decc6SDave Kleikamp static void journal_free_journal_head(struct journal_head *jh) 2161470decc6SDave Kleikamp { 2162e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2163470decc6SDave Kleikamp atomic_dec(&nr_journal_heads); 2164cd02ff0bSMingming Cao memset(jh, JBD2_POISON_FREE, sizeof(*jh)); 2165470decc6SDave Kleikamp #endif 2166f7f4bccbSMingming Cao kmem_cache_free(jbd2_journal_head_cache, jh); 2167470decc6SDave Kleikamp } 2168470decc6SDave Kleikamp 2169470decc6SDave Kleikamp /* 2170470decc6SDave Kleikamp * A journal_head is attached to a buffer_head whenever JBD has an 2171470decc6SDave Kleikamp * interest in the buffer. 2172470decc6SDave Kleikamp * 2173470decc6SDave Kleikamp * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit 2174470decc6SDave Kleikamp * is set. This bit is tested in core kernel code where we need to take 2175470decc6SDave Kleikamp * JBD-specific actions. Testing the zeroness of ->b_private is not reliable 2176470decc6SDave Kleikamp * there. 2177470decc6SDave Kleikamp * 2178470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. 2179470decc6SDave Kleikamp * 2180470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set it is immune from being released by 2181470decc6SDave Kleikamp * core kernel code, mainly via ->b_count. 2182470decc6SDave Kleikamp * 2183de1b7941SJan Kara * A journal_head is detached from its buffer_head when the journal_head's 2184de1b7941SJan Kara * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint 2185de1b7941SJan Kara * transaction (b_cp_transaction) hold their references to b_jcount. 2186470decc6SDave Kleikamp * 2187470decc6SDave Kleikamp * Various places in the kernel want to attach a journal_head to a buffer_head 2188470decc6SDave Kleikamp * _before_ attaching the journal_head to a transaction. To protect the 2189f7f4bccbSMingming Cao * journal_head in this situation, jbd2_journal_add_journal_head elevates the 2190470decc6SDave Kleikamp * journal_head's b_jcount refcount by one. The caller must call 2191f7f4bccbSMingming Cao * jbd2_journal_put_journal_head() to undo this. 2192470decc6SDave Kleikamp * 2193470decc6SDave Kleikamp * So the typical usage would be: 2194470decc6SDave Kleikamp * 2195470decc6SDave Kleikamp * (Attach a journal_head if needed. Increments b_jcount) 2196f7f4bccbSMingming Cao * struct journal_head *jh = jbd2_journal_add_journal_head(bh); 2197470decc6SDave Kleikamp * ... 2198de1b7941SJan Kara * (Get another reference for transaction) 2199de1b7941SJan Kara * jbd2_journal_grab_journal_head(bh); 2200470decc6SDave Kleikamp * jh->b_transaction = xxx; 2201de1b7941SJan Kara * (Put original reference) 2202f7f4bccbSMingming Cao * jbd2_journal_put_journal_head(jh); 2203470decc6SDave Kleikamp */ 2204470decc6SDave Kleikamp 2205470decc6SDave Kleikamp /* 2206470decc6SDave Kleikamp * Give a buffer_head a journal_head. 2207470decc6SDave Kleikamp * 2208470decc6SDave Kleikamp * May sleep. 2209470decc6SDave Kleikamp */ 2210f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) 2211470decc6SDave Kleikamp { 2212470decc6SDave Kleikamp struct journal_head *jh; 2213470decc6SDave Kleikamp struct journal_head *new_jh = NULL; 2214470decc6SDave Kleikamp 2215470decc6SDave Kleikamp repeat: 2216470decc6SDave Kleikamp if (!buffer_jbd(bh)) { 2217470decc6SDave Kleikamp new_jh = journal_alloc_journal_head(); 2218470decc6SDave Kleikamp memset(new_jh, 0, sizeof(*new_jh)); 2219470decc6SDave Kleikamp } 2220470decc6SDave Kleikamp 2221470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2222470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2223470decc6SDave Kleikamp jh = bh2jh(bh); 2224470decc6SDave Kleikamp } else { 2225470decc6SDave Kleikamp J_ASSERT_BH(bh, 2226470decc6SDave Kleikamp (atomic_read(&bh->b_count) > 0) || 2227470decc6SDave Kleikamp (bh->b_page && bh->b_page->mapping)); 2228470decc6SDave Kleikamp 2229470decc6SDave Kleikamp if (!new_jh) { 2230470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2231470decc6SDave Kleikamp goto repeat; 2232470decc6SDave Kleikamp } 2233470decc6SDave Kleikamp 2234470decc6SDave Kleikamp jh = new_jh; 2235470decc6SDave Kleikamp new_jh = NULL; /* We consumed it */ 2236470decc6SDave Kleikamp set_buffer_jbd(bh); 2237470decc6SDave Kleikamp bh->b_private = jh; 2238470decc6SDave Kleikamp jh->b_bh = bh; 2239470decc6SDave Kleikamp get_bh(bh); 2240470decc6SDave Kleikamp BUFFER_TRACE(bh, "added journal_head"); 2241470decc6SDave Kleikamp } 2242470decc6SDave Kleikamp jh->b_jcount++; 2243470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2244470decc6SDave Kleikamp if (new_jh) 2245470decc6SDave Kleikamp journal_free_journal_head(new_jh); 2246470decc6SDave Kleikamp return bh->b_private; 2247470decc6SDave Kleikamp } 2248470decc6SDave Kleikamp 2249470decc6SDave Kleikamp /* 2250470decc6SDave Kleikamp * Grab a ref against this buffer_head's journal_head. If it ended up not 2251470decc6SDave Kleikamp * having a journal_head, return NULL 2252470decc6SDave Kleikamp */ 2253f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) 2254470decc6SDave Kleikamp { 2255470decc6SDave Kleikamp struct journal_head *jh = NULL; 2256470decc6SDave Kleikamp 2257470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2258470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2259470decc6SDave Kleikamp jh = bh2jh(bh); 2260470decc6SDave Kleikamp jh->b_jcount++; 2261470decc6SDave Kleikamp } 2262470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2263470decc6SDave Kleikamp return jh; 2264470decc6SDave Kleikamp } 2265470decc6SDave Kleikamp 2266470decc6SDave Kleikamp static void __journal_remove_journal_head(struct buffer_head *bh) 2267470decc6SDave Kleikamp { 2268470decc6SDave Kleikamp struct journal_head *jh = bh2jh(bh); 2269470decc6SDave Kleikamp 2270470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount >= 0); 2271de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_transaction == NULL); 2272de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_next_transaction == NULL); 2273de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); 2274470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jlist == BJ_None); 2275470decc6SDave Kleikamp J_ASSERT_BH(bh, buffer_jbd(bh)); 2276470decc6SDave Kleikamp J_ASSERT_BH(bh, jh2bh(jh) == bh); 2277470decc6SDave Kleikamp BUFFER_TRACE(bh, "remove journal_head"); 2278470decc6SDave Kleikamp if (jh->b_frozen_data) { 2279de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__); 2280af1e76d6SMingming Cao jbd2_free(jh->b_frozen_data, bh->b_size); 2281470decc6SDave Kleikamp } 2282470decc6SDave Kleikamp if (jh->b_committed_data) { 2283de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__); 2284af1e76d6SMingming Cao jbd2_free(jh->b_committed_data, bh->b_size); 2285470decc6SDave Kleikamp } 2286470decc6SDave Kleikamp bh->b_private = NULL; 2287470decc6SDave Kleikamp jh->b_bh = NULL; /* debug, really */ 2288470decc6SDave Kleikamp clear_buffer_jbd(bh); 2289470decc6SDave Kleikamp journal_free_journal_head(jh); 2290470decc6SDave Kleikamp } 2291470decc6SDave Kleikamp 2292470decc6SDave Kleikamp /* 2293de1b7941SJan Kara * Drop a reference on the passed journal_head. If it fell to zero then 2294470decc6SDave Kleikamp * release the journal_head from the buffer_head. 2295470decc6SDave Kleikamp */ 2296f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh) 2297470decc6SDave Kleikamp { 2298470decc6SDave Kleikamp struct buffer_head *bh = jh2bh(jh); 2299470decc6SDave Kleikamp 2300470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2301470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount > 0); 2302470decc6SDave Kleikamp --jh->b_jcount; 2303de1b7941SJan Kara if (!jh->b_jcount) { 2304470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2305de1b7941SJan Kara jbd_unlock_bh_journal_head(bh); 2306470decc6SDave Kleikamp __brelse(bh); 2307de1b7941SJan Kara } else 2308470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2309470decc6SDave Kleikamp } 2310470decc6SDave Kleikamp 2311470decc6SDave Kleikamp /* 2312c851ed54SJan Kara * Initialize jbd inode head 2313c851ed54SJan Kara */ 2314c851ed54SJan Kara void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) 2315c851ed54SJan Kara { 2316c851ed54SJan Kara jinode->i_transaction = NULL; 2317c851ed54SJan Kara jinode->i_next_transaction = NULL; 2318c851ed54SJan Kara jinode->i_vfs_inode = inode; 2319c851ed54SJan Kara jinode->i_flags = 0; 2320c851ed54SJan Kara INIT_LIST_HEAD(&jinode->i_list); 2321c851ed54SJan Kara } 2322c851ed54SJan Kara 2323c851ed54SJan Kara /* 2324c851ed54SJan Kara * Function to be called before we start removing inode from memory (i.e., 2325c851ed54SJan Kara * clear_inode() is a fine place to be called from). It removes inode from 2326c851ed54SJan Kara * transaction's lists. 2327c851ed54SJan Kara */ 2328c851ed54SJan Kara void jbd2_journal_release_jbd_inode(journal_t *journal, 2329c851ed54SJan Kara struct jbd2_inode *jinode) 2330c851ed54SJan Kara { 2331c851ed54SJan Kara if (!journal) 2332c851ed54SJan Kara return; 2333c851ed54SJan Kara restart: 2334c851ed54SJan Kara spin_lock(&journal->j_list_lock); 2335c851ed54SJan Kara /* Is commit writing out inode - we have to wait */ 233639e3ac25SBrian King if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) { 2337c851ed54SJan Kara wait_queue_head_t *wq; 2338c851ed54SJan Kara DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); 2339c851ed54SJan Kara wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); 2340c851ed54SJan Kara prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); 2341c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2342c851ed54SJan Kara schedule(); 2343c851ed54SJan Kara finish_wait(wq, &wait.wait); 2344c851ed54SJan Kara goto restart; 2345c851ed54SJan Kara } 2346c851ed54SJan Kara 2347c851ed54SJan Kara if (jinode->i_transaction) { 2348c851ed54SJan Kara list_del(&jinode->i_list); 2349c851ed54SJan Kara jinode->i_transaction = NULL; 2350c851ed54SJan Kara } 2351c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2352c851ed54SJan Kara } 2353c851ed54SJan Kara 2354c851ed54SJan Kara /* 23550f49d5d0SJose R. Santos * debugfs tunables 2356470decc6SDave Kleikamp */ 23576f38c74fSJose R. Santos #ifdef CONFIG_JBD2_DEBUG 23586f38c74fSJose R. Santos u8 jbd2_journal_enable_debug __read_mostly; 2359f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_enable_debug); 2360470decc6SDave Kleikamp 23610f49d5d0SJose R. Santos #define JBD2_DEBUG_NAME "jbd2-debug" 2362470decc6SDave Kleikamp 23636f38c74fSJose R. Santos static struct dentry *jbd2_debugfs_dir; 23646f38c74fSJose R. Santos static struct dentry *jbd2_debug; 23650f49d5d0SJose R. Santos 23660f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 2367470decc6SDave Kleikamp { 23680f49d5d0SJose R. Santos jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL); 23690f49d5d0SJose R. Santos if (jbd2_debugfs_dir) 2370765f8361SYin Kangkai jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, 2371765f8361SYin Kangkai S_IRUGO | S_IWUSR, 23720f49d5d0SJose R. Santos jbd2_debugfs_dir, 23730f49d5d0SJose R. Santos &jbd2_journal_enable_debug); 2374470decc6SDave Kleikamp } 2375470decc6SDave Kleikamp 23760f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 2377470decc6SDave Kleikamp { 23780f49d5d0SJose R. Santos debugfs_remove(jbd2_debug); 23790f49d5d0SJose R. Santos debugfs_remove(jbd2_debugfs_dir); 2380470decc6SDave Kleikamp } 2381470decc6SDave Kleikamp 2382470decc6SDave Kleikamp #else 2383470decc6SDave Kleikamp 23840f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 23850f49d5d0SJose R. Santos { 23860f49d5d0SJose R. Santos } 23870f49d5d0SJose R. Santos 23880f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 23890f49d5d0SJose R. Santos { 23900f49d5d0SJose R. Santos } 2391470decc6SDave Kleikamp 2392470decc6SDave Kleikamp #endif 2393470decc6SDave Kleikamp 23948e85fb3fSJohann Lombardi #ifdef CONFIG_PROC_FS 23958e85fb3fSJohann Lombardi 23968e85fb3fSJohann Lombardi #define JBD2_STATS_PROC_NAME "fs/jbd2" 23978e85fb3fSJohann Lombardi 23988e85fb3fSJohann Lombardi static void __init jbd2_create_jbd_stats_proc_entry(void) 23998e85fb3fSJohann Lombardi { 24008e85fb3fSJohann Lombardi proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); 24018e85fb3fSJohann Lombardi } 24028e85fb3fSJohann Lombardi 24038e85fb3fSJohann Lombardi static void __exit jbd2_remove_jbd_stats_proc_entry(void) 24048e85fb3fSJohann Lombardi { 24058e85fb3fSJohann Lombardi if (proc_jbd2_stats) 24068e85fb3fSJohann Lombardi remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); 24078e85fb3fSJohann Lombardi } 24088e85fb3fSJohann Lombardi 24098e85fb3fSJohann Lombardi #else 24108e85fb3fSJohann Lombardi 24118e85fb3fSJohann Lombardi #define jbd2_create_jbd_stats_proc_entry() do {} while (0) 24128e85fb3fSJohann Lombardi #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) 24138e85fb3fSJohann Lombardi 24148e85fb3fSJohann Lombardi #endif 24158e85fb3fSJohann Lombardi 24168aefcd55STheodore Ts'o struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; 2417470decc6SDave Kleikamp 24184185a2acSYongqiang Yang static int __init jbd2_journal_init_handle_cache(void) 2419470decc6SDave Kleikamp { 24208aefcd55STheodore Ts'o jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); 2421f7f4bccbSMingming Cao if (jbd2_handle_cache == NULL) { 24228aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create handle cache\n"); 24238aefcd55STheodore Ts'o return -ENOMEM; 24248aefcd55STheodore Ts'o } 24258aefcd55STheodore Ts'o jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); 24268aefcd55STheodore Ts'o if (jbd2_inode_cache == NULL) { 24278aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create inode cache\n"); 24288aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_handle_cache); 2429470decc6SDave Kleikamp return -ENOMEM; 2430470decc6SDave Kleikamp } 2431470decc6SDave Kleikamp return 0; 2432470decc6SDave Kleikamp } 2433470decc6SDave Kleikamp 2434f7f4bccbSMingming Cao static void jbd2_journal_destroy_handle_cache(void) 2435470decc6SDave Kleikamp { 2436f7f4bccbSMingming Cao if (jbd2_handle_cache) 2437f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_handle_cache); 24388aefcd55STheodore Ts'o if (jbd2_inode_cache) 24398aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_inode_cache); 24408aefcd55STheodore Ts'o 2441470decc6SDave Kleikamp } 2442470decc6SDave Kleikamp 2443470decc6SDave Kleikamp /* 2444470decc6SDave Kleikamp * Module startup and shutdown 2445470decc6SDave Kleikamp */ 2446470decc6SDave Kleikamp 2447470decc6SDave Kleikamp static int __init journal_init_caches(void) 2448470decc6SDave Kleikamp { 2449470decc6SDave Kleikamp int ret; 2450470decc6SDave Kleikamp 2451f7f4bccbSMingming Cao ret = jbd2_journal_init_revoke_caches(); 2452470decc6SDave Kleikamp if (ret == 0) 24534185a2acSYongqiang Yang ret = jbd2_journal_init_journal_head_cache(); 2454470decc6SDave Kleikamp if (ret == 0) 24554185a2acSYongqiang Yang ret = jbd2_journal_init_handle_cache(); 24560c2022ecSYongqiang Yang if (ret == 0) 24570c2022ecSYongqiang Yang ret = jbd2_journal_init_transaction_cache(); 2458470decc6SDave Kleikamp return ret; 2459470decc6SDave Kleikamp } 2460470decc6SDave Kleikamp 2461f7f4bccbSMingming Cao static void jbd2_journal_destroy_caches(void) 2462470decc6SDave Kleikamp { 2463f7f4bccbSMingming Cao jbd2_journal_destroy_revoke_caches(); 24644185a2acSYongqiang Yang jbd2_journal_destroy_journal_head_cache(); 2465f7f4bccbSMingming Cao jbd2_journal_destroy_handle_cache(); 24660c2022ecSYongqiang Yang jbd2_journal_destroy_transaction_cache(); 2467d2eecb03STheodore Ts'o jbd2_journal_destroy_slabs(); 2468470decc6SDave Kleikamp } 2469470decc6SDave Kleikamp 2470470decc6SDave Kleikamp static int __init journal_init(void) 2471470decc6SDave Kleikamp { 2472470decc6SDave Kleikamp int ret; 2473470decc6SDave Kleikamp 2474470decc6SDave Kleikamp BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); 2475470decc6SDave Kleikamp 2476470decc6SDave Kleikamp ret = journal_init_caches(); 2477620de4e1SDuane Griffin if (ret == 0) { 24780f49d5d0SJose R. Santos jbd2_create_debugfs_entry(); 24798e85fb3fSJohann Lombardi jbd2_create_jbd_stats_proc_entry(); 2480620de4e1SDuane Griffin } else { 2481620de4e1SDuane Griffin jbd2_journal_destroy_caches(); 2482620de4e1SDuane Griffin } 2483470decc6SDave Kleikamp return ret; 2484470decc6SDave Kleikamp } 2485470decc6SDave Kleikamp 2486470decc6SDave Kleikamp static void __exit journal_exit(void) 2487470decc6SDave Kleikamp { 2488e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2489470decc6SDave Kleikamp int n = atomic_read(&nr_journal_heads); 2490470decc6SDave Kleikamp if (n) 2491f2a44523SEryu Guan printk(KERN_EMERG "JBD2: leaked %d journal_heads!\n", n); 2492470decc6SDave Kleikamp #endif 24930f49d5d0SJose R. Santos jbd2_remove_debugfs_entry(); 24948e85fb3fSJohann Lombardi jbd2_remove_jbd_stats_proc_entry(); 2495f7f4bccbSMingming Cao jbd2_journal_destroy_caches(); 2496470decc6SDave Kleikamp } 2497470decc6SDave Kleikamp 2498470decc6SDave Kleikamp MODULE_LICENSE("GPL"); 2499470decc6SDave Kleikamp module_init(journal_init); 2500470decc6SDave Kleikamp module_exit(journal_exit); 2501470decc6SDave Kleikamp 2502