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 7458e85fb3fSJohann Lombardi struct jbd2_stats_proc_session { 7468e85fb3fSJohann Lombardi journal_t *journal; 7478e85fb3fSJohann Lombardi struct transaction_stats_s *stats; 7488e85fb3fSJohann Lombardi int start; 7498e85fb3fSJohann Lombardi int max; 7508e85fb3fSJohann Lombardi }; 7518e85fb3fSJohann Lombardi 7528e85fb3fSJohann Lombardi static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) 7538e85fb3fSJohann Lombardi { 7548e85fb3fSJohann Lombardi return *pos ? NULL : SEQ_START_TOKEN; 7558e85fb3fSJohann Lombardi } 7568e85fb3fSJohann Lombardi 7578e85fb3fSJohann Lombardi static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) 7588e85fb3fSJohann Lombardi { 7598e85fb3fSJohann Lombardi return NULL; 7608e85fb3fSJohann Lombardi } 7618e85fb3fSJohann Lombardi 7628e85fb3fSJohann Lombardi static int jbd2_seq_info_show(struct seq_file *seq, void *v) 7638e85fb3fSJohann Lombardi { 7648e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 7658e85fb3fSJohann Lombardi 7668e85fb3fSJohann Lombardi if (v != SEQ_START_TOKEN) 7678e85fb3fSJohann Lombardi return 0; 7688e85fb3fSJohann Lombardi seq_printf(seq, "%lu transaction, each up to %u blocks\n", 7698e85fb3fSJohann Lombardi s->stats->ts_tid, 7708e85fb3fSJohann Lombardi s->journal->j_max_transaction_buffers); 7718e85fb3fSJohann Lombardi if (s->stats->ts_tid == 0) 7728e85fb3fSJohann Lombardi return 0; 7738e85fb3fSJohann Lombardi seq_printf(seq, "average: \n %ums waiting for transaction\n", 774bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); 7758e85fb3fSJohann Lombardi seq_printf(seq, " %ums running transaction\n", 776bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); 7778e85fb3fSJohann Lombardi seq_printf(seq, " %ums transaction was being locked\n", 778bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); 7798e85fb3fSJohann Lombardi seq_printf(seq, " %ums flushing data (in ordered mode)\n", 780bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); 7818e85fb3fSJohann Lombardi seq_printf(seq, " %ums logging transaction\n", 782bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); 783c225aa57SSimon Holm Thøgersen seq_printf(seq, " %lluus average transaction commit time\n", 784c225aa57SSimon Holm Thøgersen div_u64(s->journal->j_average_commit_time, 1000)); 7858e85fb3fSJohann Lombardi seq_printf(seq, " %lu handles per transaction\n", 786bf699327STheodore Ts'o s->stats->run.rs_handle_count / s->stats->ts_tid); 7878e85fb3fSJohann Lombardi seq_printf(seq, " %lu blocks per transaction\n", 788bf699327STheodore Ts'o s->stats->run.rs_blocks / s->stats->ts_tid); 7898e85fb3fSJohann Lombardi seq_printf(seq, " %lu logged blocks per transaction\n", 790bf699327STheodore Ts'o s->stats->run.rs_blocks_logged / s->stats->ts_tid); 7918e85fb3fSJohann Lombardi return 0; 7928e85fb3fSJohann Lombardi } 7938e85fb3fSJohann Lombardi 7948e85fb3fSJohann Lombardi static void jbd2_seq_info_stop(struct seq_file *seq, void *v) 7958e85fb3fSJohann Lombardi { 7968e85fb3fSJohann Lombardi } 7978e85fb3fSJohann Lombardi 79888e9d34cSJames Morris static const struct seq_operations jbd2_seq_info_ops = { 7998e85fb3fSJohann Lombardi .start = jbd2_seq_info_start, 8008e85fb3fSJohann Lombardi .next = jbd2_seq_info_next, 8018e85fb3fSJohann Lombardi .stop = jbd2_seq_info_stop, 8028e85fb3fSJohann Lombardi .show = jbd2_seq_info_show, 8038e85fb3fSJohann Lombardi }; 8048e85fb3fSJohann Lombardi 8058e85fb3fSJohann Lombardi static int jbd2_seq_info_open(struct inode *inode, struct file *file) 8068e85fb3fSJohann Lombardi { 8078e85fb3fSJohann Lombardi journal_t *journal = PDE(inode)->data; 8088e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 8098e85fb3fSJohann Lombardi int rc, size; 8108e85fb3fSJohann Lombardi 8118e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 8128e85fb3fSJohann Lombardi if (s == NULL) 8138e85fb3fSJohann Lombardi return -ENOMEM; 8148e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s); 8158e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 8168e85fb3fSJohann Lombardi if (s->stats == NULL) { 8178e85fb3fSJohann Lombardi kfree(s); 8188e85fb3fSJohann Lombardi return -ENOMEM; 8198e85fb3fSJohann Lombardi } 8208e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 8218e85fb3fSJohann Lombardi memcpy(s->stats, &journal->j_stats, size); 8228e85fb3fSJohann Lombardi s->journal = journal; 8238e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 8248e85fb3fSJohann Lombardi 8258e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_info_ops); 8268e85fb3fSJohann Lombardi if (rc == 0) { 8278e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 8288e85fb3fSJohann Lombardi m->private = s; 8298e85fb3fSJohann Lombardi } else { 8308e85fb3fSJohann Lombardi kfree(s->stats); 8318e85fb3fSJohann Lombardi kfree(s); 8328e85fb3fSJohann Lombardi } 8338e85fb3fSJohann Lombardi return rc; 8348e85fb3fSJohann Lombardi 8358e85fb3fSJohann Lombardi } 8368e85fb3fSJohann Lombardi 8378e85fb3fSJohann Lombardi static int jbd2_seq_info_release(struct inode *inode, struct file *file) 8388e85fb3fSJohann Lombardi { 8398e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 8408e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 8418e85fb3fSJohann Lombardi kfree(s->stats); 8428e85fb3fSJohann Lombardi kfree(s); 8438e85fb3fSJohann Lombardi return seq_release(inode, file); 8448e85fb3fSJohann Lombardi } 8458e85fb3fSJohann Lombardi 846828c0950SAlexey Dobriyan static const struct file_operations jbd2_seq_info_fops = { 8478e85fb3fSJohann Lombardi .owner = THIS_MODULE, 8488e85fb3fSJohann Lombardi .open = jbd2_seq_info_open, 8498e85fb3fSJohann Lombardi .read = seq_read, 8508e85fb3fSJohann Lombardi .llseek = seq_lseek, 8518e85fb3fSJohann Lombardi .release = jbd2_seq_info_release, 8528e85fb3fSJohann Lombardi }; 8538e85fb3fSJohann Lombardi 8548e85fb3fSJohann Lombardi static struct proc_dir_entry *proc_jbd2_stats; 8558e85fb3fSJohann Lombardi 8568e85fb3fSJohann Lombardi static void jbd2_stats_proc_init(journal_t *journal) 8578e85fb3fSJohann Lombardi { 85805496769STheodore Ts'o journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); 8598e85fb3fSJohann Lombardi if (journal->j_proc_entry) { 86079da3664SDenis V. Lunev proc_create_data("info", S_IRUGO, journal->j_proc_entry, 86179da3664SDenis V. Lunev &jbd2_seq_info_fops, journal); 8628e85fb3fSJohann Lombardi } 8638e85fb3fSJohann Lombardi } 8648e85fb3fSJohann Lombardi 8658e85fb3fSJohann Lombardi static void jbd2_stats_proc_exit(journal_t *journal) 8668e85fb3fSJohann Lombardi { 8678e85fb3fSJohann Lombardi remove_proc_entry("info", journal->j_proc_entry); 86805496769STheodore Ts'o remove_proc_entry(journal->j_devname, proc_jbd2_stats); 8698e85fb3fSJohann Lombardi } 8708e85fb3fSJohann Lombardi 871470decc6SDave Kleikamp /* 872470decc6SDave Kleikamp * Management for journal control blocks: functions to create and 873470decc6SDave Kleikamp * destroy journal_t structures, and to initialise and read existing 874470decc6SDave Kleikamp * journal blocks from disk. */ 875470decc6SDave Kleikamp 876470decc6SDave Kleikamp /* First: create and setup a journal_t object in memory. We initialise 877470decc6SDave Kleikamp * very few fields yet: that has to wait until we have created the 878470decc6SDave Kleikamp * journal structures from from scratch, or loaded them from disk. */ 879470decc6SDave Kleikamp 880470decc6SDave Kleikamp static journal_t * journal_init_common (void) 881470decc6SDave Kleikamp { 882470decc6SDave Kleikamp journal_t *journal; 883470decc6SDave Kleikamp int err; 884470decc6SDave Kleikamp 8853ebfdf88SAndrew Morton journal = kzalloc(sizeof(*journal), GFP_KERNEL); 886470decc6SDave Kleikamp if (!journal) 887b7271b0aSTheodore Ts'o return NULL; 888470decc6SDave Kleikamp 889470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_transaction_locked); 890470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_logspace); 891470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_done_commit); 892470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_checkpoint); 893470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_commit); 894470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_updates); 895470decc6SDave Kleikamp mutex_init(&journal->j_barrier); 896470decc6SDave Kleikamp mutex_init(&journal->j_checkpoint_mutex); 897470decc6SDave Kleikamp spin_lock_init(&journal->j_revoke_lock); 898470decc6SDave Kleikamp spin_lock_init(&journal->j_list_lock); 899a931da6aSTheodore Ts'o rwlock_init(&journal->j_state_lock); 900470decc6SDave Kleikamp 901cd02ff0bSMingming Cao journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); 90230773840STheodore Ts'o journal->j_min_batch_time = 0; 90330773840STheodore Ts'o journal->j_max_batch_time = 15000; /* 15ms */ 904470decc6SDave Kleikamp 905470decc6SDave Kleikamp /* The journal is marked for error until we succeed with recovery! */ 906f7f4bccbSMingming Cao journal->j_flags = JBD2_ABORT; 907470decc6SDave Kleikamp 908470decc6SDave Kleikamp /* Set up a default-sized revoke table for the new mount. */ 909f7f4bccbSMingming Cao err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); 910470decc6SDave Kleikamp if (err) { 911470decc6SDave Kleikamp kfree(journal); 912b7271b0aSTheodore Ts'o return NULL; 913470decc6SDave Kleikamp } 9148e85fb3fSJohann Lombardi 915bf699327STheodore Ts'o spin_lock_init(&journal->j_history_lock); 9168e85fb3fSJohann Lombardi 917470decc6SDave Kleikamp return journal; 918470decc6SDave Kleikamp } 919470decc6SDave Kleikamp 920f7f4bccbSMingming Cao /* jbd2_journal_init_dev and jbd2_journal_init_inode: 921470decc6SDave Kleikamp * 922470decc6SDave Kleikamp * Create a journal structure assigned some fixed set of disk blocks to 923470decc6SDave Kleikamp * the journal. We don't actually touch those disk blocks yet, but we 924470decc6SDave Kleikamp * need to set up all of the mapping information to tell the journaling 925470decc6SDave Kleikamp * system where the journal blocks are. 926470decc6SDave Kleikamp * 927470decc6SDave Kleikamp */ 928470decc6SDave Kleikamp 929470decc6SDave Kleikamp /** 9305648ba5bSRandy Dunlap * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure 931470decc6SDave Kleikamp * @bdev: Block device on which to create the journal 932470decc6SDave Kleikamp * @fs_dev: Device which hold journalled filesystem for this journal. 933470decc6SDave Kleikamp * @start: Block nr Start of journal. 934470decc6SDave Kleikamp * @len: Length of the journal in blocks. 935470decc6SDave Kleikamp * @blocksize: blocksize of journalling device 9365648ba5bSRandy Dunlap * 9375648ba5bSRandy Dunlap * Returns: a newly created journal_t * 938470decc6SDave Kleikamp * 939f7f4bccbSMingming Cao * jbd2_journal_init_dev creates a journal which maps a fixed contiguous 940470decc6SDave Kleikamp * range of blocks on an arbitrary block device. 941470decc6SDave Kleikamp * 942470decc6SDave Kleikamp */ 943f7f4bccbSMingming Cao journal_t * jbd2_journal_init_dev(struct block_device *bdev, 944470decc6SDave Kleikamp struct block_device *fs_dev, 94518eba7aaSMingming Cao unsigned long long start, int len, int blocksize) 946470decc6SDave Kleikamp { 947470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 948470decc6SDave Kleikamp struct buffer_head *bh; 94905496769STheodore Ts'o char *p; 950470decc6SDave Kleikamp int n; 951470decc6SDave Kleikamp 952470decc6SDave Kleikamp if (!journal) 953470decc6SDave Kleikamp return NULL; 954470decc6SDave Kleikamp 955470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 956470decc6SDave Kleikamp journal->j_blocksize = blocksize; 9570587aa3dSyangsheng journal->j_dev = bdev; 9580587aa3dSyangsheng journal->j_fs_dev = fs_dev; 9590587aa3dSyangsheng journal->j_blk_offset = start; 9600587aa3dSyangsheng journal->j_maxlen = len; 9610587aa3dSyangsheng bdevname(journal->j_dev, journal->j_devname); 9620587aa3dSyangsheng p = journal->j_devname; 9630587aa3dSyangsheng while ((p = strchr(p, '/'))) 9640587aa3dSyangsheng *p = '!'; 9654b905671SJan Kara jbd2_stats_proc_init(journal); 966470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 967470decc6SDave Kleikamp journal->j_wbufsize = n; 968470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 969470decc6SDave Kleikamp if (!journal->j_wbuf) { 97025985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 971329d291fSHarvey Harrison __func__); 9724b905671SJan Kara goto out_err; 973470decc6SDave Kleikamp } 974470decc6SDave Kleikamp 975470decc6SDave Kleikamp bh = __getblk(journal->j_dev, start, journal->j_blocksize); 9764b905671SJan Kara if (!bh) { 9774b905671SJan Kara printk(KERN_ERR 9784b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 9794b905671SJan Kara __func__); 9804b905671SJan Kara goto out_err; 9814b905671SJan Kara } 982470decc6SDave Kleikamp journal->j_sb_buffer = bh; 983470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 9844b905671SJan Kara 985470decc6SDave Kleikamp return journal; 9864b905671SJan Kara out_err: 9877b02bec0STao Ma kfree(journal->j_wbuf); 9884b905671SJan Kara jbd2_stats_proc_exit(journal); 9894b905671SJan Kara kfree(journal); 9904b905671SJan Kara return NULL; 991470decc6SDave Kleikamp } 992470decc6SDave Kleikamp 993470decc6SDave Kleikamp /** 994f7f4bccbSMingming Cao * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. 995470decc6SDave Kleikamp * @inode: An inode to create the journal in 996470decc6SDave Kleikamp * 997f7f4bccbSMingming Cao * jbd2_journal_init_inode creates a journal which maps an on-disk inode as 998470decc6SDave Kleikamp * the journal. The inode must exist already, must support bmap() and 999470decc6SDave Kleikamp * must have all data blocks preallocated. 1000470decc6SDave Kleikamp */ 1001f7f4bccbSMingming Cao journal_t * jbd2_journal_init_inode (struct inode *inode) 1002470decc6SDave Kleikamp { 1003470decc6SDave Kleikamp struct buffer_head *bh; 1004470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 100505496769STheodore Ts'o char *p; 1006470decc6SDave Kleikamp int err; 1007470decc6SDave Kleikamp int n; 100818eba7aaSMingming Cao unsigned long long blocknr; 1009470decc6SDave Kleikamp 1010470decc6SDave Kleikamp if (!journal) 1011470decc6SDave Kleikamp return NULL; 1012470decc6SDave Kleikamp 1013470decc6SDave Kleikamp journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; 1014470decc6SDave Kleikamp journal->j_inode = inode; 101505496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 101605496769STheodore Ts'o p = journal->j_devname; 101705496769STheodore Ts'o while ((p = strchr(p, '/'))) 101805496769STheodore Ts'o *p = '!'; 101905496769STheodore Ts'o p = journal->j_devname + strlen(journal->j_devname); 102090576c0bSTheodore Ts'o sprintf(p, "-%lu", journal->j_inode->i_ino); 1021470decc6SDave Kleikamp jbd_debug(1, 1022470decc6SDave Kleikamp "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", 1023470decc6SDave Kleikamp journal, inode->i_sb->s_id, inode->i_ino, 1024470decc6SDave Kleikamp (long long) inode->i_size, 1025470decc6SDave Kleikamp inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); 1026470decc6SDave Kleikamp 1027470decc6SDave Kleikamp journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; 1028470decc6SDave Kleikamp journal->j_blocksize = inode->i_sb->s_blocksize; 10298e85fb3fSJohann Lombardi jbd2_stats_proc_init(journal); 1030470decc6SDave Kleikamp 1031470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1032470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1033470decc6SDave Kleikamp journal->j_wbufsize = n; 1034470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1035470decc6SDave Kleikamp if (!journal->j_wbuf) { 103625985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1037329d291fSHarvey Harrison __func__); 10384b905671SJan Kara goto out_err; 1039470decc6SDave Kleikamp } 1040470decc6SDave Kleikamp 1041f7f4bccbSMingming Cao err = jbd2_journal_bmap(journal, 0, &blocknr); 1042470decc6SDave Kleikamp /* If that failed, give up */ 1043470decc6SDave Kleikamp if (err) { 10443c26bdb4SJustin P. Mattock printk(KERN_ERR "%s: Cannot locate journal superblock\n", 1045329d291fSHarvey Harrison __func__); 10464b905671SJan Kara goto out_err; 1047470decc6SDave Kleikamp } 1048470decc6SDave Kleikamp 1049470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 10504b905671SJan Kara if (!bh) { 10514b905671SJan Kara printk(KERN_ERR 10524b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 10534b905671SJan Kara __func__); 10544b905671SJan Kara goto out_err; 10554b905671SJan Kara } 1056470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1057470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 1058470decc6SDave Kleikamp 1059470decc6SDave Kleikamp return journal; 10604b905671SJan Kara out_err: 10617b02bec0STao Ma kfree(journal->j_wbuf); 10624b905671SJan Kara jbd2_stats_proc_exit(journal); 10634b905671SJan Kara kfree(journal); 10644b905671SJan Kara return NULL; 1065470decc6SDave Kleikamp } 1066470decc6SDave Kleikamp 1067470decc6SDave Kleikamp /* 1068470decc6SDave Kleikamp * If the journal init or create aborts, we need to mark the journal 1069470decc6SDave Kleikamp * superblock as being NULL to prevent the journal destroy from writing 1070470decc6SDave Kleikamp * back a bogus superblock. 1071470decc6SDave Kleikamp */ 1072470decc6SDave Kleikamp static void journal_fail_superblock (journal_t *journal) 1073470decc6SDave Kleikamp { 1074470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1075470decc6SDave Kleikamp brelse(bh); 1076470decc6SDave Kleikamp journal->j_sb_buffer = NULL; 1077470decc6SDave Kleikamp } 1078470decc6SDave Kleikamp 1079470decc6SDave Kleikamp /* 1080470decc6SDave Kleikamp * Given a journal_t structure, initialise the various fields for 1081470decc6SDave Kleikamp * startup of a new journaling session. We use this both when creating 1082470decc6SDave Kleikamp * a journal, and after recovering an old journal to reset it for 1083470decc6SDave Kleikamp * subsequent use. 1084470decc6SDave Kleikamp */ 1085470decc6SDave Kleikamp 1086470decc6SDave Kleikamp static int journal_reset(journal_t *journal) 1087470decc6SDave Kleikamp { 1088470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 108918eba7aaSMingming Cao unsigned long long first, last; 1090470decc6SDave Kleikamp 1091470decc6SDave Kleikamp first = be32_to_cpu(sb->s_first); 1092470decc6SDave Kleikamp last = be32_to_cpu(sb->s_maxlen); 1093f6f50e28SJan Kara if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { 1094f2a44523SEryu Guan printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu).\n", 1095f6f50e28SJan Kara first, last); 1096f6f50e28SJan Kara journal_fail_superblock(journal); 1097f6f50e28SJan Kara return -EINVAL; 1098f6f50e28SJan Kara } 1099470decc6SDave Kleikamp 1100470decc6SDave Kleikamp journal->j_first = first; 1101470decc6SDave Kleikamp journal->j_last = last; 1102470decc6SDave Kleikamp 1103470decc6SDave Kleikamp journal->j_head = first; 1104470decc6SDave Kleikamp journal->j_tail = first; 1105470decc6SDave Kleikamp journal->j_free = last - first; 1106470decc6SDave Kleikamp 1107470decc6SDave Kleikamp journal->j_tail_sequence = journal->j_transaction_sequence; 1108470decc6SDave Kleikamp journal->j_commit_sequence = journal->j_transaction_sequence - 1; 1109470decc6SDave Kleikamp journal->j_commit_request = journal->j_commit_sequence; 1110470decc6SDave Kleikamp 1111470decc6SDave Kleikamp journal->j_max_transaction_buffers = journal->j_maxlen / 4; 1112470decc6SDave Kleikamp 1113470decc6SDave Kleikamp /* 1114470decc6SDave Kleikamp * As a special case, if the on-disk copy is already marked as needing 111524bcc89cSJan Kara * no recovery (s_start == 0), then we can safely defer the superblock 111624bcc89cSJan Kara * update until the next commit by setting JBD2_FLUSHED. This avoids 1117470decc6SDave Kleikamp * attempting a write to a potential-readonly device. 1118470decc6SDave Kleikamp */ 111924bcc89cSJan Kara if (sb->s_start == 0) { 1120f2a44523SEryu Guan jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " 1121470decc6SDave Kleikamp "(start %ld, seq %d, errno %d)\n", 1122470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, 1123470decc6SDave Kleikamp journal->j_errno); 112424bcc89cSJan Kara journal->j_flags |= JBD2_FLUSHED; 112524bcc89cSJan Kara } else { 1126a78bb11dSJan Kara /* Lock here to make assertions happy... */ 1127a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 112824bcc89cSJan Kara /* Add the dynamic fields and write it to disk. */ 112924bcc89cSJan Kara jbd2_journal_update_sb_log_tail(journal); 1130a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 113124bcc89cSJan Kara } 113224bcc89cSJan Kara return jbd2_journal_start_thread(journal); 1133470decc6SDave Kleikamp } 1134470decc6SDave Kleikamp 113524bcc89cSJan Kara static void jbd2_write_superblock(journal_t *journal) 113624bcc89cSJan Kara { 113724bcc89cSJan Kara struct buffer_head *bh = journal->j_sb_buffer; 113824bcc89cSJan Kara 113924bcc89cSJan Kara trace_jbd2_write_superblock(journal); 1140914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1141914258bfSTheodore Ts'o /* 1142914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the journal 1143914258bfSTheodore Ts'o * superblock failed. This could happen because the 1144914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 1145914258bfSTheodore Ts'o * be a transient write error and maybe the block will 1146914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 1147914258bfSTheodore Ts'o * write and hope for the best. 1148914258bfSTheodore Ts'o */ 1149914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: previous I/O error detected " 1150914258bfSTheodore Ts'o "for journal superblock update for %s.\n", 1151914258bfSTheodore Ts'o journal->j_devname); 1152914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1153914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1154914258bfSTheodore Ts'o } 1155914258bfSTheodore Ts'o 1156470decc6SDave Kleikamp BUFFER_TRACE(bh, "marking dirty"); 1157470decc6SDave Kleikamp mark_buffer_dirty(bh); 1158470decc6SDave Kleikamp sync_dirty_buffer(bh); 1159914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1160914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: I/O error detected " 1161914258bfSTheodore Ts'o "when updating journal superblock for %s.\n", 1162914258bfSTheodore Ts'o journal->j_devname); 1163914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1164914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1165914258bfSTheodore Ts'o } 116624bcc89cSJan Kara } 1167470decc6SDave Kleikamp 116824bcc89cSJan Kara /** 116924bcc89cSJan Kara * jbd2_journal_update_sb_log_tail() - Update log tail in journal sb on disk. 117024bcc89cSJan Kara * @journal: The journal to update. 117124bcc89cSJan Kara * 117224bcc89cSJan Kara * Update a journal's superblock information about log tail and write it to 117324bcc89cSJan Kara * disk, waiting for the IO to complete. 117424bcc89cSJan Kara */ 117524bcc89cSJan Kara void jbd2_journal_update_sb_log_tail(journal_t *journal) 117624bcc89cSJan Kara { 117724bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 11782201c590SSeiji Aguchi 1179a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 118024bcc89cSJan Kara read_lock(&journal->j_state_lock); 118124bcc89cSJan Kara jbd_debug(1, "JBD2: updating superblock (start %ld, seq %d)\n", 118224bcc89cSJan Kara journal->j_tail, journal->j_tail_sequence); 1183470decc6SDave Kleikamp 118424bcc89cSJan Kara sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 118524bcc89cSJan Kara sb->s_start = cpu_to_be32(journal->j_tail); 118624bcc89cSJan Kara read_unlock(&journal->j_state_lock); 118724bcc89cSJan Kara 118824bcc89cSJan Kara jbd2_write_superblock(journal); 118924bcc89cSJan Kara 119024bcc89cSJan Kara /* Log is no longer empty */ 1191a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 119224bcc89cSJan Kara WARN_ON(!sb->s_sequence); 1193f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_FLUSHED; 119424bcc89cSJan Kara write_unlock(&journal->j_state_lock); 119524bcc89cSJan Kara } 119624bcc89cSJan Kara 119724bcc89cSJan Kara /** 119824bcc89cSJan Kara * jbd2_mark_journal_empty() - Mark on disk journal as empty. 119924bcc89cSJan Kara * @journal: The journal to update. 120024bcc89cSJan Kara * 120124bcc89cSJan Kara * Update a journal's dynamic superblock fields to show that journal is empty. 120224bcc89cSJan Kara * Write updated superblock to disk waiting for IO to complete. 120324bcc89cSJan Kara */ 120424bcc89cSJan Kara static void jbd2_mark_journal_empty(journal_t *journal) 120524bcc89cSJan Kara { 120624bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 120724bcc89cSJan Kara 1208a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 120924bcc89cSJan Kara read_lock(&journal->j_state_lock); 121024bcc89cSJan Kara jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n", 121124bcc89cSJan Kara journal->j_tail_sequence); 121224bcc89cSJan Kara 121324bcc89cSJan Kara sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 121424bcc89cSJan Kara sb->s_start = cpu_to_be32(0); 121524bcc89cSJan Kara read_unlock(&journal->j_state_lock); 121624bcc89cSJan Kara 121724bcc89cSJan Kara jbd2_write_superblock(journal); 121824bcc89cSJan Kara 121924bcc89cSJan Kara /* Log is no longer empty */ 122024bcc89cSJan Kara write_lock(&journal->j_state_lock); 1221f7f4bccbSMingming Cao journal->j_flags |= JBD2_FLUSHED; 1222a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1223470decc6SDave Kleikamp } 1224470decc6SDave Kleikamp 122524bcc89cSJan Kara 122624bcc89cSJan Kara /** 122724bcc89cSJan Kara * jbd2_journal_update_sb_errno() - Update error in the journal. 122824bcc89cSJan Kara * @journal: The journal to update. 122924bcc89cSJan Kara * 123024bcc89cSJan Kara * Update a journal's errno. Write updated superblock to disk waiting for IO 123124bcc89cSJan Kara * to complete. 123224bcc89cSJan Kara */ 123324bcc89cSJan Kara static void jbd2_journal_update_sb_errno(journal_t *journal) 123424bcc89cSJan Kara { 123524bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 123624bcc89cSJan Kara 123724bcc89cSJan Kara read_lock(&journal->j_state_lock); 123824bcc89cSJan Kara jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", 123924bcc89cSJan Kara journal->j_errno); 124024bcc89cSJan Kara sb->s_errno = cpu_to_be32(journal->j_errno); 124124bcc89cSJan Kara read_unlock(&journal->j_state_lock); 124224bcc89cSJan Kara 124324bcc89cSJan Kara jbd2_write_superblock(journal); 124424bcc89cSJan Kara } 124524bcc89cSJan Kara 1246470decc6SDave Kleikamp /* 1247470decc6SDave Kleikamp * Read the superblock for a given journal, performing initial 1248470decc6SDave Kleikamp * validation of the format. 1249470decc6SDave Kleikamp */ 1250470decc6SDave Kleikamp static int journal_get_superblock(journal_t *journal) 1251470decc6SDave Kleikamp { 1252470decc6SDave Kleikamp struct buffer_head *bh; 1253470decc6SDave Kleikamp journal_superblock_t *sb; 1254470decc6SDave Kleikamp int err = -EIO; 1255470decc6SDave Kleikamp 1256470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1257470decc6SDave Kleikamp 1258470decc6SDave Kleikamp J_ASSERT(bh != NULL); 1259470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1260470decc6SDave Kleikamp ll_rw_block(READ, 1, &bh); 1261470decc6SDave Kleikamp wait_on_buffer(bh); 1262470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1263470decc6SDave Kleikamp printk(KERN_ERR 1264f2a44523SEryu Guan "JBD2: IO error reading journal superblock\n"); 1265470decc6SDave Kleikamp goto out; 1266470decc6SDave Kleikamp } 1267470decc6SDave Kleikamp } 1268470decc6SDave Kleikamp 1269470decc6SDave Kleikamp sb = journal->j_superblock; 1270470decc6SDave Kleikamp 1271470decc6SDave Kleikamp err = -EINVAL; 1272470decc6SDave Kleikamp 1273f7f4bccbSMingming Cao if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || 1274470decc6SDave Kleikamp sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { 1275f2a44523SEryu Guan printk(KERN_WARNING "JBD2: no valid journal superblock found\n"); 1276470decc6SDave Kleikamp goto out; 1277470decc6SDave Kleikamp } 1278470decc6SDave Kleikamp 1279470decc6SDave Kleikamp switch(be32_to_cpu(sb->s_header.h_blocktype)) { 1280f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1281470decc6SDave Kleikamp journal->j_format_version = 1; 1282470decc6SDave Kleikamp break; 1283f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1284470decc6SDave Kleikamp journal->j_format_version = 2; 1285470decc6SDave Kleikamp break; 1286470decc6SDave Kleikamp default: 1287f2a44523SEryu Guan printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n"); 1288470decc6SDave Kleikamp goto out; 1289470decc6SDave Kleikamp } 1290470decc6SDave Kleikamp 1291470decc6SDave Kleikamp if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) 1292470decc6SDave Kleikamp journal->j_maxlen = be32_to_cpu(sb->s_maxlen); 1293470decc6SDave Kleikamp else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { 1294f2a44523SEryu Guan printk(KERN_WARNING "JBD2: journal file too short\n"); 1295470decc6SDave Kleikamp goto out; 1296470decc6SDave Kleikamp } 1297470decc6SDave Kleikamp 12988762202dSEryu Guan if (be32_to_cpu(sb->s_first) == 0 || 12998762202dSEryu Guan be32_to_cpu(sb->s_first) >= journal->j_maxlen) { 13008762202dSEryu Guan printk(KERN_WARNING 13018762202dSEryu Guan "JBD2: Invalid start block of journal: %u\n", 13028762202dSEryu Guan be32_to_cpu(sb->s_first)); 13038762202dSEryu Guan goto out; 13048762202dSEryu Guan } 13058762202dSEryu Guan 1306470decc6SDave Kleikamp return 0; 1307470decc6SDave Kleikamp 1308470decc6SDave Kleikamp out: 1309470decc6SDave Kleikamp journal_fail_superblock(journal); 1310470decc6SDave Kleikamp return err; 1311470decc6SDave Kleikamp } 1312470decc6SDave Kleikamp 1313470decc6SDave Kleikamp /* 1314470decc6SDave Kleikamp * Load the on-disk journal superblock and read the key fields into the 1315470decc6SDave Kleikamp * journal_t. 1316470decc6SDave Kleikamp */ 1317470decc6SDave Kleikamp 1318470decc6SDave Kleikamp static int load_superblock(journal_t *journal) 1319470decc6SDave Kleikamp { 1320470decc6SDave Kleikamp int err; 1321470decc6SDave Kleikamp journal_superblock_t *sb; 1322470decc6SDave Kleikamp 1323470decc6SDave Kleikamp err = journal_get_superblock(journal); 1324470decc6SDave Kleikamp if (err) 1325470decc6SDave Kleikamp return err; 1326470decc6SDave Kleikamp 1327470decc6SDave Kleikamp sb = journal->j_superblock; 1328470decc6SDave Kleikamp 1329470decc6SDave Kleikamp journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); 1330470decc6SDave Kleikamp journal->j_tail = be32_to_cpu(sb->s_start); 1331470decc6SDave Kleikamp journal->j_first = be32_to_cpu(sb->s_first); 1332470decc6SDave Kleikamp journal->j_last = be32_to_cpu(sb->s_maxlen); 1333470decc6SDave Kleikamp journal->j_errno = be32_to_cpu(sb->s_errno); 1334470decc6SDave Kleikamp 1335470decc6SDave Kleikamp return 0; 1336470decc6SDave Kleikamp } 1337470decc6SDave Kleikamp 1338470decc6SDave Kleikamp 1339470decc6SDave Kleikamp /** 1340f7f4bccbSMingming Cao * int jbd2_journal_load() - Read journal from disk. 1341470decc6SDave Kleikamp * @journal: Journal to act on. 1342470decc6SDave Kleikamp * 1343470decc6SDave Kleikamp * Given a journal_t structure which tells us which disk blocks contain 1344470decc6SDave Kleikamp * a journal, read the journal from disk to initialise the in-memory 1345470decc6SDave Kleikamp * structures. 1346470decc6SDave Kleikamp */ 1347f7f4bccbSMingming Cao int jbd2_journal_load(journal_t *journal) 1348470decc6SDave Kleikamp { 1349470decc6SDave Kleikamp int err; 1350470decc6SDave Kleikamp journal_superblock_t *sb; 1351470decc6SDave Kleikamp 1352470decc6SDave Kleikamp err = load_superblock(journal); 1353470decc6SDave Kleikamp if (err) 1354470decc6SDave Kleikamp return err; 1355470decc6SDave Kleikamp 1356470decc6SDave Kleikamp sb = journal->j_superblock; 1357470decc6SDave Kleikamp /* If this is a V2 superblock, then we have to check the 1358470decc6SDave Kleikamp * features flags on it. */ 1359470decc6SDave Kleikamp 1360470decc6SDave Kleikamp if (journal->j_format_version >= 2) { 1361470decc6SDave Kleikamp if ((sb->s_feature_ro_compat & 1362f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || 1363470decc6SDave Kleikamp (sb->s_feature_incompat & 1364f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { 1365470decc6SDave Kleikamp printk(KERN_WARNING 1366f2a44523SEryu Guan "JBD2: Unrecognised features on journal\n"); 1367470decc6SDave Kleikamp return -EINVAL; 1368470decc6SDave Kleikamp } 1369470decc6SDave Kleikamp } 1370470decc6SDave Kleikamp 1371d2eecb03STheodore Ts'o /* 1372d2eecb03STheodore Ts'o * Create a slab for this blocksize 1373d2eecb03STheodore Ts'o */ 1374d2eecb03STheodore Ts'o err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); 1375d2eecb03STheodore Ts'o if (err) 1376d2eecb03STheodore Ts'o return err; 1377d2eecb03STheodore Ts'o 1378470decc6SDave Kleikamp /* Let the recovery code check whether it needs to recover any 1379470decc6SDave Kleikamp * data from the journal. */ 1380f7f4bccbSMingming Cao if (jbd2_journal_recover(journal)) 1381470decc6SDave Kleikamp goto recovery_error; 1382470decc6SDave Kleikamp 1383e6a47428STheodore Ts'o if (journal->j_failed_commit) { 1384e6a47428STheodore Ts'o printk(KERN_ERR "JBD2: journal transaction %u on %s " 1385e6a47428STheodore Ts'o "is corrupt.\n", journal->j_failed_commit, 1386e6a47428STheodore Ts'o journal->j_devname); 1387e6a47428STheodore Ts'o return -EIO; 1388e6a47428STheodore Ts'o } 1389e6a47428STheodore Ts'o 1390470decc6SDave Kleikamp /* OK, we've finished with the dynamic journal bits: 1391470decc6SDave Kleikamp * reinitialise the dynamic contents of the superblock in memory 1392470decc6SDave Kleikamp * and reset them on disk. */ 1393470decc6SDave Kleikamp if (journal_reset(journal)) 1394470decc6SDave Kleikamp goto recovery_error; 1395470decc6SDave Kleikamp 1396f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_ABORT; 1397f7f4bccbSMingming Cao journal->j_flags |= JBD2_LOADED; 1398470decc6SDave Kleikamp return 0; 1399470decc6SDave Kleikamp 1400470decc6SDave Kleikamp recovery_error: 1401f2a44523SEryu Guan printk(KERN_WARNING "JBD2: recovery failed\n"); 1402470decc6SDave Kleikamp return -EIO; 1403470decc6SDave Kleikamp } 1404470decc6SDave Kleikamp 1405470decc6SDave Kleikamp /** 1406f7f4bccbSMingming Cao * void jbd2_journal_destroy() - Release a journal_t structure. 1407470decc6SDave Kleikamp * @journal: Journal to act on. 1408470decc6SDave Kleikamp * 1409470decc6SDave Kleikamp * Release a journal_t structure once it is no longer in use by the 1410470decc6SDave Kleikamp * journaled object. 141144519fafSHidehiro Kawai * Return <0 if we couldn't clean up the journal. 1412470decc6SDave Kleikamp */ 141344519fafSHidehiro Kawai int jbd2_journal_destroy(journal_t *journal) 1414470decc6SDave Kleikamp { 141544519fafSHidehiro Kawai int err = 0; 141644519fafSHidehiro Kawai 1417470decc6SDave Kleikamp /* Wait for the commit thread to wake up and die. */ 1418470decc6SDave Kleikamp journal_kill_thread(journal); 1419470decc6SDave Kleikamp 1420470decc6SDave Kleikamp /* Force a final log commit */ 1421470decc6SDave Kleikamp if (journal->j_running_transaction) 1422f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 1423470decc6SDave Kleikamp 1424470decc6SDave Kleikamp /* Force any old transactions to disk */ 1425470decc6SDave Kleikamp 1426470decc6SDave Kleikamp /* Totally anal locking here... */ 1427470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1428470decc6SDave Kleikamp while (journal->j_checkpoint_transactions != NULL) { 1429470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 14301a0d3786STheodore Ts'o mutex_lock(&journal->j_checkpoint_mutex); 1431f7f4bccbSMingming Cao jbd2_log_do_checkpoint(journal); 14321a0d3786STheodore Ts'o mutex_unlock(&journal->j_checkpoint_mutex); 1433470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1434470decc6SDave Kleikamp } 1435470decc6SDave Kleikamp 1436470decc6SDave Kleikamp J_ASSERT(journal->j_running_transaction == NULL); 1437470decc6SDave Kleikamp J_ASSERT(journal->j_committing_transaction == NULL); 1438470decc6SDave Kleikamp J_ASSERT(journal->j_checkpoint_transactions == NULL); 1439470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 1440470decc6SDave Kleikamp 144144519fafSHidehiro Kawai if (journal->j_sb_buffer) { 1442a78bb11dSJan Kara if (!is_journal_aborted(journal)) { 1443a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 144424bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1445a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1446a78bb11dSJan Kara } else 144744519fafSHidehiro Kawai err = -EIO; 1448470decc6SDave Kleikamp brelse(journal->j_sb_buffer); 1449470decc6SDave Kleikamp } 1450470decc6SDave Kleikamp 14518e85fb3fSJohann Lombardi if (journal->j_proc_entry) 14528e85fb3fSJohann Lombardi jbd2_stats_proc_exit(journal); 1453470decc6SDave Kleikamp if (journal->j_inode) 1454470decc6SDave Kleikamp iput(journal->j_inode); 1455470decc6SDave Kleikamp if (journal->j_revoke) 1456f7f4bccbSMingming Cao jbd2_journal_destroy_revoke(journal); 1457470decc6SDave Kleikamp kfree(journal->j_wbuf); 1458470decc6SDave Kleikamp kfree(journal); 145944519fafSHidehiro Kawai 146044519fafSHidehiro Kawai return err; 1461470decc6SDave Kleikamp } 1462470decc6SDave Kleikamp 1463470decc6SDave Kleikamp 1464470decc6SDave Kleikamp /** 1465f7f4bccbSMingming Cao *int jbd2_journal_check_used_features () - Check if features specified are used. 1466470decc6SDave Kleikamp * @journal: Journal to check. 1467470decc6SDave Kleikamp * @compat: bitmask of compatible features 1468470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1469470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1470470decc6SDave Kleikamp * 1471470decc6SDave Kleikamp * Check whether the journal uses all of a given set of 1472470decc6SDave Kleikamp * features. Return true (non-zero) if it does. 1473470decc6SDave Kleikamp **/ 1474470decc6SDave Kleikamp 1475f7f4bccbSMingming Cao int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, 1476470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1477470decc6SDave Kleikamp { 1478470decc6SDave Kleikamp journal_superblock_t *sb; 1479470decc6SDave Kleikamp 1480470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1481470decc6SDave Kleikamp return 1; 14821113e1b5SPatrick J. LoPresti /* Load journal superblock if it is not loaded yet. */ 14831113e1b5SPatrick J. LoPresti if (journal->j_format_version == 0 && 14841113e1b5SPatrick J. LoPresti journal_get_superblock(journal) != 0) 14851113e1b5SPatrick J. LoPresti return 0; 1486470decc6SDave Kleikamp if (journal->j_format_version == 1) 1487470decc6SDave Kleikamp return 0; 1488470decc6SDave Kleikamp 1489470decc6SDave Kleikamp sb = journal->j_superblock; 1490470decc6SDave Kleikamp 1491470decc6SDave Kleikamp if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && 1492470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && 1493470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) 1494470decc6SDave Kleikamp return 1; 1495470decc6SDave Kleikamp 1496470decc6SDave Kleikamp return 0; 1497470decc6SDave Kleikamp } 1498470decc6SDave Kleikamp 1499470decc6SDave Kleikamp /** 1500f7f4bccbSMingming Cao * int jbd2_journal_check_available_features() - Check feature set in journalling layer 1501470decc6SDave Kleikamp * @journal: Journal to check. 1502470decc6SDave Kleikamp * @compat: bitmask of compatible features 1503470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1504470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1505470decc6SDave Kleikamp * 1506470decc6SDave Kleikamp * Check whether the journaling code supports the use of 1507470decc6SDave Kleikamp * all of a given set of features on this journal. Return true 1508470decc6SDave Kleikamp * (non-zero) if it can. */ 1509470decc6SDave Kleikamp 1510f7f4bccbSMingming Cao int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, 1511470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1512470decc6SDave Kleikamp { 1513470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1514470decc6SDave Kleikamp return 1; 1515470decc6SDave Kleikamp 1516470decc6SDave Kleikamp /* We can support any known requested features iff the 1517470decc6SDave Kleikamp * superblock is in version 2. Otherwise we fail to support any 1518470decc6SDave Kleikamp * extended sb features. */ 1519470decc6SDave Kleikamp 1520470decc6SDave Kleikamp if (journal->j_format_version != 2) 1521470decc6SDave Kleikamp return 0; 1522470decc6SDave Kleikamp 1523f7f4bccbSMingming Cao if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && 1524f7f4bccbSMingming Cao (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && 1525f7f4bccbSMingming Cao (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) 1526470decc6SDave Kleikamp return 1; 1527470decc6SDave Kleikamp 1528470decc6SDave Kleikamp return 0; 1529470decc6SDave Kleikamp } 1530470decc6SDave Kleikamp 1531470decc6SDave Kleikamp /** 1532f7f4bccbSMingming Cao * int jbd2_journal_set_features () - Mark a given journal feature in the superblock 1533470decc6SDave Kleikamp * @journal: Journal to act on. 1534470decc6SDave Kleikamp * @compat: bitmask of compatible features 1535470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1536470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1537470decc6SDave Kleikamp * 1538470decc6SDave Kleikamp * Mark a given journal feature as present on the 1539470decc6SDave Kleikamp * superblock. Returns true if the requested features could be set. 1540470decc6SDave Kleikamp * 1541470decc6SDave Kleikamp */ 1542470decc6SDave Kleikamp 1543f7f4bccbSMingming Cao int jbd2_journal_set_features (journal_t *journal, unsigned long compat, 1544470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1545470decc6SDave Kleikamp { 1546470decc6SDave Kleikamp journal_superblock_t *sb; 1547470decc6SDave Kleikamp 1548f7f4bccbSMingming Cao if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) 1549470decc6SDave Kleikamp return 1; 1550470decc6SDave Kleikamp 1551f7f4bccbSMingming Cao if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) 1552470decc6SDave Kleikamp return 0; 1553470decc6SDave Kleikamp 1554470decc6SDave Kleikamp jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", 1555470decc6SDave Kleikamp compat, ro, incompat); 1556470decc6SDave Kleikamp 1557470decc6SDave Kleikamp sb = journal->j_superblock; 1558470decc6SDave Kleikamp 1559470decc6SDave Kleikamp sb->s_feature_compat |= cpu_to_be32(compat); 1560470decc6SDave Kleikamp sb->s_feature_ro_compat |= cpu_to_be32(ro); 1561470decc6SDave Kleikamp sb->s_feature_incompat |= cpu_to_be32(incompat); 1562470decc6SDave Kleikamp 1563470decc6SDave Kleikamp return 1; 1564470decc6SDave Kleikamp } 1565470decc6SDave Kleikamp 1566818d276cSGirish Shilamkar /* 1567818d276cSGirish Shilamkar * jbd2_journal_clear_features () - Clear a given journal feature in the 1568818d276cSGirish Shilamkar * superblock 1569818d276cSGirish Shilamkar * @journal: Journal to act on. 1570818d276cSGirish Shilamkar * @compat: bitmask of compatible features 1571818d276cSGirish Shilamkar * @ro: bitmask of features that force read-only mount 1572818d276cSGirish Shilamkar * @incompat: bitmask of incompatible features 1573818d276cSGirish Shilamkar * 1574818d276cSGirish Shilamkar * Clear a given journal feature as present on the 1575818d276cSGirish Shilamkar * superblock. 1576818d276cSGirish Shilamkar */ 1577818d276cSGirish Shilamkar void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, 1578818d276cSGirish Shilamkar unsigned long ro, unsigned long incompat) 1579818d276cSGirish Shilamkar { 1580818d276cSGirish Shilamkar journal_superblock_t *sb; 1581818d276cSGirish Shilamkar 1582818d276cSGirish Shilamkar jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", 1583818d276cSGirish Shilamkar compat, ro, incompat); 1584818d276cSGirish Shilamkar 1585818d276cSGirish Shilamkar sb = journal->j_superblock; 1586818d276cSGirish Shilamkar 1587818d276cSGirish Shilamkar sb->s_feature_compat &= ~cpu_to_be32(compat); 1588818d276cSGirish Shilamkar sb->s_feature_ro_compat &= ~cpu_to_be32(ro); 1589818d276cSGirish Shilamkar sb->s_feature_incompat &= ~cpu_to_be32(incompat); 1590818d276cSGirish Shilamkar } 1591818d276cSGirish Shilamkar EXPORT_SYMBOL(jbd2_journal_clear_features); 1592470decc6SDave Kleikamp 1593470decc6SDave Kleikamp /** 1594f7f4bccbSMingming Cao * int jbd2_journal_flush () - Flush journal 1595470decc6SDave Kleikamp * @journal: Journal to act on. 1596470decc6SDave Kleikamp * 1597470decc6SDave Kleikamp * Flush all data for a given journal to disk and empty the journal. 1598470decc6SDave Kleikamp * Filesystems can use this when remounting readonly to ensure that 1599470decc6SDave Kleikamp * recovery does not need to happen on remount. 1600470decc6SDave Kleikamp */ 1601470decc6SDave Kleikamp 1602f7f4bccbSMingming Cao int jbd2_journal_flush(journal_t *journal) 1603470decc6SDave Kleikamp { 1604470decc6SDave Kleikamp int err = 0; 1605470decc6SDave Kleikamp transaction_t *transaction = NULL; 1606470decc6SDave Kleikamp 1607a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1608470decc6SDave Kleikamp 1609470decc6SDave Kleikamp /* Force everything buffered to the log... */ 1610470decc6SDave Kleikamp if (journal->j_running_transaction) { 1611470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1612f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1613470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 1614470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 1615470decc6SDave Kleikamp 1616470decc6SDave Kleikamp /* Wait for the log commit to complete... */ 1617470decc6SDave Kleikamp if (transaction) { 1618470decc6SDave Kleikamp tid_t tid = transaction->t_tid; 1619470decc6SDave Kleikamp 1620a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1621f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 1622470decc6SDave Kleikamp } else { 1623a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1624470decc6SDave Kleikamp } 1625470decc6SDave Kleikamp 1626470decc6SDave Kleikamp /* ...and flush everything in the log out to disk. */ 1627470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1628470decc6SDave Kleikamp while (!err && journal->j_checkpoint_transactions != NULL) { 1629470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 163044519fafSHidehiro Kawai mutex_lock(&journal->j_checkpoint_mutex); 1631f7f4bccbSMingming Cao err = jbd2_log_do_checkpoint(journal); 163244519fafSHidehiro Kawai mutex_unlock(&journal->j_checkpoint_mutex); 1633470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1634470decc6SDave Kleikamp } 1635470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 163644519fafSHidehiro Kawai 163744519fafSHidehiro Kawai if (is_journal_aborted(journal)) 163844519fafSHidehiro Kawai return -EIO; 163944519fafSHidehiro Kawai 1640a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 1641f7f4bccbSMingming Cao jbd2_cleanup_journal_tail(journal); 1642470decc6SDave Kleikamp 1643470decc6SDave Kleikamp /* Finally, mark the journal as really needing no recovery. 1644470decc6SDave Kleikamp * This sets s_start==0 in the underlying superblock, which is 1645470decc6SDave Kleikamp * the magic code for a fully-recovered superblock. Any future 1646470decc6SDave Kleikamp * commits of data to the journal will restore the current 1647470decc6SDave Kleikamp * s_start value. */ 164824bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1649a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1650a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1651470decc6SDave Kleikamp J_ASSERT(!journal->j_running_transaction); 1652470decc6SDave Kleikamp J_ASSERT(!journal->j_committing_transaction); 1653470decc6SDave Kleikamp J_ASSERT(!journal->j_checkpoint_transactions); 1654470decc6SDave Kleikamp J_ASSERT(journal->j_head == journal->j_tail); 1655470decc6SDave Kleikamp J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); 1656a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 165744519fafSHidehiro Kawai return 0; 1658470decc6SDave Kleikamp } 1659470decc6SDave Kleikamp 1660470decc6SDave Kleikamp /** 1661f7f4bccbSMingming Cao * int jbd2_journal_wipe() - Wipe journal contents 1662470decc6SDave Kleikamp * @journal: Journal to act on. 1663470decc6SDave Kleikamp * @write: flag (see below) 1664470decc6SDave Kleikamp * 1665470decc6SDave Kleikamp * Wipe out all of the contents of a journal, safely. This will produce 1666470decc6SDave Kleikamp * a warning if the journal contains any valid recovery information. 1667f7f4bccbSMingming Cao * Must be called between journal_init_*() and jbd2_journal_load(). 1668470decc6SDave Kleikamp * 1669470decc6SDave Kleikamp * If 'write' is non-zero, then we wipe out the journal on disk; otherwise 1670470decc6SDave Kleikamp * we merely suppress recovery. 1671470decc6SDave Kleikamp */ 1672470decc6SDave Kleikamp 1673f7f4bccbSMingming Cao int jbd2_journal_wipe(journal_t *journal, int write) 1674470decc6SDave Kleikamp { 1675470decc6SDave Kleikamp int err = 0; 1676470decc6SDave Kleikamp 1677f7f4bccbSMingming Cao J_ASSERT (!(journal->j_flags & JBD2_LOADED)); 1678470decc6SDave Kleikamp 1679470decc6SDave Kleikamp err = load_superblock(journal); 1680470decc6SDave Kleikamp if (err) 1681470decc6SDave Kleikamp return err; 1682470decc6SDave Kleikamp 1683470decc6SDave Kleikamp if (!journal->j_tail) 1684470decc6SDave Kleikamp goto no_recovery; 1685470decc6SDave Kleikamp 1686f2a44523SEryu Guan printk(KERN_WARNING "JBD2: %s recovery information on journal\n", 1687470decc6SDave Kleikamp write ? "Clearing" : "Ignoring"); 1688470decc6SDave Kleikamp 1689f7f4bccbSMingming Cao err = jbd2_journal_skip_recovery(journal); 1690a78bb11dSJan Kara if (write) { 1691a78bb11dSJan Kara /* Lock to make assertions happy... */ 1692a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 169324bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1694a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1695a78bb11dSJan Kara } 1696470decc6SDave Kleikamp 1697470decc6SDave Kleikamp no_recovery: 1698470decc6SDave Kleikamp return err; 1699470decc6SDave Kleikamp } 1700470decc6SDave Kleikamp 1701470decc6SDave Kleikamp /* 1702470decc6SDave Kleikamp * Journal abort has very specific semantics, which we describe 1703470decc6SDave Kleikamp * for journal abort. 1704470decc6SDave Kleikamp * 1705bfcd3555SAlberto Bertogli * Two internal functions, which provide abort to the jbd layer 1706470decc6SDave Kleikamp * itself are here. 1707470decc6SDave Kleikamp */ 1708470decc6SDave Kleikamp 1709470decc6SDave Kleikamp /* 1710470decc6SDave Kleikamp * Quick version for internal journal use (doesn't lock the journal). 1711470decc6SDave Kleikamp * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, 1712470decc6SDave Kleikamp * and don't attempt to make any other journal updates. 1713470decc6SDave Kleikamp */ 1714f7f4bccbSMingming Cao void __jbd2_journal_abort_hard(journal_t *journal) 1715470decc6SDave Kleikamp { 1716470decc6SDave Kleikamp transaction_t *transaction; 1717470decc6SDave Kleikamp 1718f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1719470decc6SDave Kleikamp return; 1720470decc6SDave Kleikamp 1721470decc6SDave Kleikamp printk(KERN_ERR "Aborting journal on device %s.\n", 172205496769STheodore Ts'o journal->j_devname); 1723470decc6SDave Kleikamp 1724a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1725f7f4bccbSMingming Cao journal->j_flags |= JBD2_ABORT; 1726470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1727470decc6SDave Kleikamp if (transaction) 1728f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1729a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1730470decc6SDave Kleikamp } 1731470decc6SDave Kleikamp 1732470decc6SDave Kleikamp /* Soft abort: record the abort error status in the journal superblock, 1733470decc6SDave Kleikamp * but don't do any other IO. */ 1734470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno) 1735470decc6SDave Kleikamp { 1736f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1737470decc6SDave Kleikamp return; 1738470decc6SDave Kleikamp 1739470decc6SDave Kleikamp if (!journal->j_errno) 1740470decc6SDave Kleikamp journal->j_errno = errno; 1741470decc6SDave Kleikamp 1742f7f4bccbSMingming Cao __jbd2_journal_abort_hard(journal); 1743470decc6SDave Kleikamp 1744470decc6SDave Kleikamp if (errno) 174524bcc89cSJan Kara jbd2_journal_update_sb_errno(journal); 1746470decc6SDave Kleikamp } 1747470decc6SDave Kleikamp 1748470decc6SDave Kleikamp /** 1749f7f4bccbSMingming Cao * void jbd2_journal_abort () - Shutdown the journal immediately. 1750470decc6SDave Kleikamp * @journal: the journal to shutdown. 1751470decc6SDave Kleikamp * @errno: an error number to record in the journal indicating 1752470decc6SDave Kleikamp * the reason for the shutdown. 1753470decc6SDave Kleikamp * 1754470decc6SDave Kleikamp * Perform a complete, immediate shutdown of the ENTIRE 1755470decc6SDave Kleikamp * journal (not of a single transaction). This operation cannot be 1756470decc6SDave Kleikamp * undone without closing and reopening the journal. 1757470decc6SDave Kleikamp * 1758f7f4bccbSMingming Cao * The jbd2_journal_abort function is intended to support higher level error 1759470decc6SDave Kleikamp * recovery mechanisms such as the ext2/ext3 remount-readonly error 1760470decc6SDave Kleikamp * mode. 1761470decc6SDave Kleikamp * 1762470decc6SDave Kleikamp * Journal abort has very specific semantics. Any existing dirty, 1763470decc6SDave Kleikamp * unjournaled buffers in the main filesystem will still be written to 1764470decc6SDave Kleikamp * disk by bdflush, but the journaling mechanism will be suspended 1765470decc6SDave Kleikamp * immediately and no further transaction commits will be honoured. 1766470decc6SDave Kleikamp * 1767470decc6SDave Kleikamp * Any dirty, journaled buffers will be written back to disk without 1768470decc6SDave Kleikamp * hitting the journal. Atomicity cannot be guaranteed on an aborted 1769470decc6SDave Kleikamp * filesystem, but we _do_ attempt to leave as much data as possible 1770470decc6SDave Kleikamp * behind for fsck to use for cleanup. 1771470decc6SDave Kleikamp * 1772470decc6SDave Kleikamp * Any attempt to get a new transaction handle on a journal which is in 1773470decc6SDave Kleikamp * ABORT state will just result in an -EROFS error return. A 1774f7f4bccbSMingming Cao * jbd2_journal_stop on an existing handle will return -EIO if we have 1775470decc6SDave Kleikamp * entered abort state during the update. 1776470decc6SDave Kleikamp * 1777470decc6SDave Kleikamp * Recursive transactions are not disturbed by journal abort until the 1778f7f4bccbSMingming Cao * final jbd2_journal_stop, which will receive the -EIO error. 1779470decc6SDave Kleikamp * 1780f7f4bccbSMingming Cao * Finally, the jbd2_journal_abort call allows the caller to supply an errno 1781470decc6SDave Kleikamp * which will be recorded (if possible) in the journal superblock. This 1782470decc6SDave Kleikamp * allows a client to record failure conditions in the middle of a 1783470decc6SDave Kleikamp * transaction without having to complete the transaction to record the 1784470decc6SDave Kleikamp * failure to disk. ext3_error, for example, now uses this 1785470decc6SDave Kleikamp * functionality. 1786470decc6SDave Kleikamp * 1787470decc6SDave Kleikamp * Errors which originate from within the journaling layer will NOT 1788470decc6SDave Kleikamp * supply an errno; a null errno implies that absolutely no further 1789470decc6SDave Kleikamp * writes are done to the journal (unless there are any already in 1790470decc6SDave Kleikamp * progress). 1791470decc6SDave Kleikamp * 1792470decc6SDave Kleikamp */ 1793470decc6SDave Kleikamp 1794f7f4bccbSMingming Cao void jbd2_journal_abort(journal_t *journal, int errno) 1795470decc6SDave Kleikamp { 1796470decc6SDave Kleikamp __journal_abort_soft(journal, errno); 1797470decc6SDave Kleikamp } 1798470decc6SDave Kleikamp 1799470decc6SDave Kleikamp /** 1800f7f4bccbSMingming Cao * int jbd2_journal_errno () - returns the journal's error state. 1801470decc6SDave Kleikamp * @journal: journal to examine. 1802470decc6SDave Kleikamp * 1803bfcd3555SAlberto Bertogli * This is the errno number set with jbd2_journal_abort(), the last 1804470decc6SDave Kleikamp * time the journal was mounted - if the journal was stopped 1805470decc6SDave Kleikamp * without calling abort this will be 0. 1806470decc6SDave Kleikamp * 1807470decc6SDave Kleikamp * If the journal has been aborted on this mount time -EROFS will 1808470decc6SDave Kleikamp * be returned. 1809470decc6SDave Kleikamp */ 1810f7f4bccbSMingming Cao int jbd2_journal_errno(journal_t *journal) 1811470decc6SDave Kleikamp { 1812470decc6SDave Kleikamp int err; 1813470decc6SDave Kleikamp 1814a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 1815f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1816470decc6SDave Kleikamp err = -EROFS; 1817470decc6SDave Kleikamp else 1818470decc6SDave Kleikamp err = journal->j_errno; 1819a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 1820470decc6SDave Kleikamp return err; 1821470decc6SDave Kleikamp } 1822470decc6SDave Kleikamp 1823470decc6SDave Kleikamp /** 1824f7f4bccbSMingming Cao * int jbd2_journal_clear_err () - clears the journal's error state 1825470decc6SDave Kleikamp * @journal: journal to act on. 1826470decc6SDave Kleikamp * 1827bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 1828470decc6SDave Kleikamp * mode. 1829470decc6SDave Kleikamp */ 1830f7f4bccbSMingming Cao int jbd2_journal_clear_err(journal_t *journal) 1831470decc6SDave Kleikamp { 1832470decc6SDave Kleikamp int err = 0; 1833470decc6SDave Kleikamp 1834a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1835f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1836470decc6SDave Kleikamp err = -EROFS; 1837470decc6SDave Kleikamp else 1838470decc6SDave Kleikamp journal->j_errno = 0; 1839a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1840470decc6SDave Kleikamp return err; 1841470decc6SDave Kleikamp } 1842470decc6SDave Kleikamp 1843470decc6SDave Kleikamp /** 1844f7f4bccbSMingming Cao * void jbd2_journal_ack_err() - Ack journal err. 1845470decc6SDave Kleikamp * @journal: journal to act on. 1846470decc6SDave Kleikamp * 1847bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 1848470decc6SDave Kleikamp * mode. 1849470decc6SDave Kleikamp */ 1850f7f4bccbSMingming Cao void jbd2_journal_ack_err(journal_t *journal) 1851470decc6SDave Kleikamp { 1852a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1853470decc6SDave Kleikamp if (journal->j_errno) 1854f7f4bccbSMingming Cao journal->j_flags |= JBD2_ACK_ERR; 1855a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1856470decc6SDave Kleikamp } 1857470decc6SDave Kleikamp 1858f7f4bccbSMingming Cao int jbd2_journal_blocks_per_page(struct inode *inode) 1859470decc6SDave Kleikamp { 1860470decc6SDave Kleikamp return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 1861470decc6SDave Kleikamp } 1862470decc6SDave Kleikamp 1863470decc6SDave Kleikamp /* 1864b517bea1SZach Brown * helper functions to deal with 32 or 64bit block numbers. 1865b517bea1SZach Brown */ 1866b517bea1SZach Brown size_t journal_tag_bytes(journal_t *journal) 1867b517bea1SZach Brown { 1868b517bea1SZach Brown if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) 1869cd02ff0bSMingming Cao return JBD2_TAG_SIZE64; 1870b517bea1SZach Brown else 1871cd02ff0bSMingming Cao return JBD2_TAG_SIZE32; 1872b517bea1SZach Brown } 1873b517bea1SZach Brown 1874b517bea1SZach Brown /* 1875d2eecb03STheodore Ts'o * JBD memory management 1876d2eecb03STheodore Ts'o * 1877d2eecb03STheodore Ts'o * These functions are used to allocate block-sized chunks of memory 1878d2eecb03STheodore Ts'o * used for making copies of buffer_head data. Very often it will be 1879d2eecb03STheodore Ts'o * page-sized chunks of data, but sometimes it will be in 1880d2eecb03STheodore Ts'o * sub-page-size chunks. (For example, 16k pages on Power systems 1881d2eecb03STheodore Ts'o * with a 4k block file system.) For blocks smaller than a page, we 1882d2eecb03STheodore Ts'o * use a SLAB allocator. There are slab caches for each block size, 1883d2eecb03STheodore Ts'o * which are allocated at mount time, if necessary, and we only free 1884d2eecb03STheodore Ts'o * (all of) the slab caches when/if the jbd2 module is unloaded. For 1885d2eecb03STheodore Ts'o * this reason we don't need to a mutex to protect access to 1886d2eecb03STheodore Ts'o * jbd2_slab[] allocating or releasing memory; only in 1887d2eecb03STheodore Ts'o * jbd2_journal_create_slab(). 1888d2eecb03STheodore Ts'o */ 1889d2eecb03STheodore Ts'o #define JBD2_MAX_SLABS 8 1890d2eecb03STheodore Ts'o static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; 1891d2eecb03STheodore Ts'o 1892d2eecb03STheodore Ts'o static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { 1893d2eecb03STheodore Ts'o "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", 1894d2eecb03STheodore Ts'o "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" 1895d2eecb03STheodore Ts'o }; 1896d2eecb03STheodore Ts'o 1897d2eecb03STheodore Ts'o 1898d2eecb03STheodore Ts'o static void jbd2_journal_destroy_slabs(void) 1899d2eecb03STheodore Ts'o { 1900d2eecb03STheodore Ts'o int i; 1901d2eecb03STheodore Ts'o 1902d2eecb03STheodore Ts'o for (i = 0; i < JBD2_MAX_SLABS; i++) { 1903d2eecb03STheodore Ts'o if (jbd2_slab[i]) 1904d2eecb03STheodore Ts'o kmem_cache_destroy(jbd2_slab[i]); 1905d2eecb03STheodore Ts'o jbd2_slab[i] = NULL; 1906d2eecb03STheodore Ts'o } 1907d2eecb03STheodore Ts'o } 1908d2eecb03STheodore Ts'o 1909d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t size) 1910d2eecb03STheodore Ts'o { 191151dfacdeSThomas Gleixner static DEFINE_MUTEX(jbd2_slab_create_mutex); 1912d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 1913d2eecb03STheodore Ts'o size_t slab_size; 1914d2eecb03STheodore Ts'o 1915d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 1916d2eecb03STheodore Ts'o return 0; 1917d2eecb03STheodore Ts'o 1918d2eecb03STheodore Ts'o if (i >= JBD2_MAX_SLABS) 1919d2eecb03STheodore Ts'o return -EINVAL; 1920d2eecb03STheodore Ts'o 1921d2eecb03STheodore Ts'o if (unlikely(i < 0)) 1922d2eecb03STheodore Ts'o i = 0; 192351dfacdeSThomas Gleixner mutex_lock(&jbd2_slab_create_mutex); 1924d2eecb03STheodore Ts'o if (jbd2_slab[i]) { 192551dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 1926d2eecb03STheodore Ts'o return 0; /* Already created */ 1927d2eecb03STheodore Ts'o } 1928d2eecb03STheodore Ts'o 1929d2eecb03STheodore Ts'o slab_size = 1 << (i+10); 1930d2eecb03STheodore Ts'o jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, 1931d2eecb03STheodore Ts'o slab_size, 0, NULL); 193251dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 1933d2eecb03STheodore Ts'o if (!jbd2_slab[i]) { 1934d2eecb03STheodore Ts'o printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); 1935d2eecb03STheodore Ts'o return -ENOMEM; 1936d2eecb03STheodore Ts'o } 1937d2eecb03STheodore Ts'o return 0; 1938d2eecb03STheodore Ts'o } 1939d2eecb03STheodore Ts'o 1940d2eecb03STheodore Ts'o static struct kmem_cache *get_slab(size_t size) 1941d2eecb03STheodore Ts'o { 1942d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 1943d2eecb03STheodore Ts'o 1944d2eecb03STheodore Ts'o BUG_ON(i >= JBD2_MAX_SLABS); 1945d2eecb03STheodore Ts'o if (unlikely(i < 0)) 1946d2eecb03STheodore Ts'o i = 0; 19478ac97b74SBill Pemberton BUG_ON(jbd2_slab[i] == NULL); 1948d2eecb03STheodore Ts'o return jbd2_slab[i]; 1949d2eecb03STheodore Ts'o } 1950d2eecb03STheodore Ts'o 1951d2eecb03STheodore Ts'o void *jbd2_alloc(size_t size, gfp_t flags) 1952d2eecb03STheodore Ts'o { 1953d2eecb03STheodore Ts'o void *ptr; 1954d2eecb03STheodore Ts'o 1955d2eecb03STheodore Ts'o BUG_ON(size & (size-1)); /* Must be a power of 2 */ 1956d2eecb03STheodore Ts'o 1957d2eecb03STheodore Ts'o flags |= __GFP_REPEAT; 1958d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 1959d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, 0); 1960d2eecb03STheodore Ts'o else if (size > PAGE_SIZE) { 1961d2eecb03STheodore Ts'o int order = get_order(size); 1962d2eecb03STheodore Ts'o 1963d2eecb03STheodore Ts'o if (order < 3) 1964d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, order); 1965d2eecb03STheodore Ts'o else 1966d2eecb03STheodore Ts'o ptr = vmalloc(size); 1967d2eecb03STheodore Ts'o } else 1968d2eecb03STheodore Ts'o ptr = kmem_cache_alloc(get_slab(size), flags); 1969d2eecb03STheodore Ts'o 1970d2eecb03STheodore Ts'o /* Check alignment; SLUB has gotten this wrong in the past, 1971d2eecb03STheodore Ts'o * and this can lead to user data corruption! */ 1972d2eecb03STheodore Ts'o BUG_ON(((unsigned long) ptr) & (size-1)); 1973d2eecb03STheodore Ts'o 1974d2eecb03STheodore Ts'o return ptr; 1975d2eecb03STheodore Ts'o } 1976d2eecb03STheodore Ts'o 1977d2eecb03STheodore Ts'o void jbd2_free(void *ptr, size_t size) 1978d2eecb03STheodore Ts'o { 1979d2eecb03STheodore Ts'o if (size == PAGE_SIZE) { 1980d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, 0); 1981d2eecb03STheodore Ts'o return; 1982d2eecb03STheodore Ts'o } 1983d2eecb03STheodore Ts'o if (size > PAGE_SIZE) { 1984d2eecb03STheodore Ts'o int order = get_order(size); 1985d2eecb03STheodore Ts'o 1986d2eecb03STheodore Ts'o if (order < 3) 1987d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, order); 1988d2eecb03STheodore Ts'o else 1989d2eecb03STheodore Ts'o vfree(ptr); 1990d2eecb03STheodore Ts'o return; 1991d2eecb03STheodore Ts'o } 1992d2eecb03STheodore Ts'o kmem_cache_free(get_slab(size), ptr); 1993d2eecb03STheodore Ts'o }; 1994d2eecb03STheodore Ts'o 1995d2eecb03STheodore Ts'o /* 1996470decc6SDave Kleikamp * Journal_head storage management 1997470decc6SDave Kleikamp */ 1998e18b890bSChristoph Lameter static struct kmem_cache *jbd2_journal_head_cache; 1999e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2000470decc6SDave Kleikamp static atomic_t nr_journal_heads = ATOMIC_INIT(0); 2001470decc6SDave Kleikamp #endif 2002470decc6SDave Kleikamp 20034185a2acSYongqiang Yang static int jbd2_journal_init_journal_head_cache(void) 2004470decc6SDave Kleikamp { 2005470decc6SDave Kleikamp int retval; 2006470decc6SDave Kleikamp 20071076d17aSAl Viro J_ASSERT(jbd2_journal_head_cache == NULL); 2008a920e941SJohann Lombardi jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", 2009470decc6SDave Kleikamp sizeof(struct journal_head), 2010470decc6SDave Kleikamp 0, /* offset */ 201177160957SMingming Cao SLAB_TEMPORARY, /* flags */ 201220c2df83SPaul Mundt NULL); /* ctor */ 2013470decc6SDave Kleikamp retval = 0; 20141076d17aSAl Viro if (!jbd2_journal_head_cache) { 2015470decc6SDave Kleikamp retval = -ENOMEM; 2016f2a44523SEryu Guan printk(KERN_EMERG "JBD2: no memory for journal_head cache\n"); 2017470decc6SDave Kleikamp } 2018470decc6SDave Kleikamp return retval; 2019470decc6SDave Kleikamp } 2020470decc6SDave Kleikamp 20214185a2acSYongqiang Yang static void jbd2_journal_destroy_journal_head_cache(void) 2022470decc6SDave Kleikamp { 20238a9362ebSDuane Griffin if (jbd2_journal_head_cache) { 2024f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_journal_head_cache); 2025f7f4bccbSMingming Cao jbd2_journal_head_cache = NULL; 2026470decc6SDave Kleikamp } 20278a9362ebSDuane Griffin } 2028470decc6SDave Kleikamp 2029470decc6SDave Kleikamp /* 2030470decc6SDave Kleikamp * journal_head splicing and dicing 2031470decc6SDave Kleikamp */ 2032470decc6SDave Kleikamp static struct journal_head *journal_alloc_journal_head(void) 2033470decc6SDave Kleikamp { 2034470decc6SDave Kleikamp struct journal_head *ret; 2035470decc6SDave Kleikamp 2036e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2037470decc6SDave Kleikamp atomic_inc(&nr_journal_heads); 2038470decc6SDave Kleikamp #endif 2039f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 20401076d17aSAl Viro if (!ret) { 2041470decc6SDave Kleikamp jbd_debug(1, "out of memory for journal_head\n"); 2042670be5a7STheodore Ts'o pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__); 20431076d17aSAl Viro while (!ret) { 2044470decc6SDave Kleikamp yield(); 2045f7f4bccbSMingming Cao ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); 2046470decc6SDave Kleikamp } 2047470decc6SDave Kleikamp } 2048470decc6SDave Kleikamp return ret; 2049470decc6SDave Kleikamp } 2050470decc6SDave Kleikamp 2051470decc6SDave Kleikamp static void journal_free_journal_head(struct journal_head *jh) 2052470decc6SDave Kleikamp { 2053e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2054470decc6SDave Kleikamp atomic_dec(&nr_journal_heads); 2055cd02ff0bSMingming Cao memset(jh, JBD2_POISON_FREE, sizeof(*jh)); 2056470decc6SDave Kleikamp #endif 2057f7f4bccbSMingming Cao kmem_cache_free(jbd2_journal_head_cache, jh); 2058470decc6SDave Kleikamp } 2059470decc6SDave Kleikamp 2060470decc6SDave Kleikamp /* 2061470decc6SDave Kleikamp * A journal_head is attached to a buffer_head whenever JBD has an 2062470decc6SDave Kleikamp * interest in the buffer. 2063470decc6SDave Kleikamp * 2064470decc6SDave Kleikamp * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit 2065470decc6SDave Kleikamp * is set. This bit is tested in core kernel code where we need to take 2066470decc6SDave Kleikamp * JBD-specific actions. Testing the zeroness of ->b_private is not reliable 2067470decc6SDave Kleikamp * there. 2068470decc6SDave Kleikamp * 2069470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. 2070470decc6SDave Kleikamp * 2071470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set it is immune from being released by 2072470decc6SDave Kleikamp * core kernel code, mainly via ->b_count. 2073470decc6SDave Kleikamp * 2074de1b7941SJan Kara * A journal_head is detached from its buffer_head when the journal_head's 2075de1b7941SJan Kara * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint 2076de1b7941SJan Kara * transaction (b_cp_transaction) hold their references to b_jcount. 2077470decc6SDave Kleikamp * 2078470decc6SDave Kleikamp * Various places in the kernel want to attach a journal_head to a buffer_head 2079470decc6SDave Kleikamp * _before_ attaching the journal_head to a transaction. To protect the 2080f7f4bccbSMingming Cao * journal_head in this situation, jbd2_journal_add_journal_head elevates the 2081470decc6SDave Kleikamp * journal_head's b_jcount refcount by one. The caller must call 2082f7f4bccbSMingming Cao * jbd2_journal_put_journal_head() to undo this. 2083470decc6SDave Kleikamp * 2084470decc6SDave Kleikamp * So the typical usage would be: 2085470decc6SDave Kleikamp * 2086470decc6SDave Kleikamp * (Attach a journal_head if needed. Increments b_jcount) 2087f7f4bccbSMingming Cao * struct journal_head *jh = jbd2_journal_add_journal_head(bh); 2088470decc6SDave Kleikamp * ... 2089de1b7941SJan Kara * (Get another reference for transaction) 2090de1b7941SJan Kara * jbd2_journal_grab_journal_head(bh); 2091470decc6SDave Kleikamp * jh->b_transaction = xxx; 2092de1b7941SJan Kara * (Put original reference) 2093f7f4bccbSMingming Cao * jbd2_journal_put_journal_head(jh); 2094470decc6SDave Kleikamp */ 2095470decc6SDave Kleikamp 2096470decc6SDave Kleikamp /* 2097470decc6SDave Kleikamp * Give a buffer_head a journal_head. 2098470decc6SDave Kleikamp * 2099470decc6SDave Kleikamp * May sleep. 2100470decc6SDave Kleikamp */ 2101f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) 2102470decc6SDave Kleikamp { 2103470decc6SDave Kleikamp struct journal_head *jh; 2104470decc6SDave Kleikamp struct journal_head *new_jh = NULL; 2105470decc6SDave Kleikamp 2106470decc6SDave Kleikamp repeat: 2107470decc6SDave Kleikamp if (!buffer_jbd(bh)) { 2108470decc6SDave Kleikamp new_jh = journal_alloc_journal_head(); 2109470decc6SDave Kleikamp memset(new_jh, 0, sizeof(*new_jh)); 2110470decc6SDave Kleikamp } 2111470decc6SDave Kleikamp 2112470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2113470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2114470decc6SDave Kleikamp jh = bh2jh(bh); 2115470decc6SDave Kleikamp } else { 2116470decc6SDave Kleikamp J_ASSERT_BH(bh, 2117470decc6SDave Kleikamp (atomic_read(&bh->b_count) > 0) || 2118470decc6SDave Kleikamp (bh->b_page && bh->b_page->mapping)); 2119470decc6SDave Kleikamp 2120470decc6SDave Kleikamp if (!new_jh) { 2121470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2122470decc6SDave Kleikamp goto repeat; 2123470decc6SDave Kleikamp } 2124470decc6SDave Kleikamp 2125470decc6SDave Kleikamp jh = new_jh; 2126470decc6SDave Kleikamp new_jh = NULL; /* We consumed it */ 2127470decc6SDave Kleikamp set_buffer_jbd(bh); 2128470decc6SDave Kleikamp bh->b_private = jh; 2129470decc6SDave Kleikamp jh->b_bh = bh; 2130470decc6SDave Kleikamp get_bh(bh); 2131470decc6SDave Kleikamp BUFFER_TRACE(bh, "added journal_head"); 2132470decc6SDave Kleikamp } 2133470decc6SDave Kleikamp jh->b_jcount++; 2134470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2135470decc6SDave Kleikamp if (new_jh) 2136470decc6SDave Kleikamp journal_free_journal_head(new_jh); 2137470decc6SDave Kleikamp return bh->b_private; 2138470decc6SDave Kleikamp } 2139470decc6SDave Kleikamp 2140470decc6SDave Kleikamp /* 2141470decc6SDave Kleikamp * Grab a ref against this buffer_head's journal_head. If it ended up not 2142470decc6SDave Kleikamp * having a journal_head, return NULL 2143470decc6SDave Kleikamp */ 2144f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) 2145470decc6SDave Kleikamp { 2146470decc6SDave Kleikamp struct journal_head *jh = NULL; 2147470decc6SDave Kleikamp 2148470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2149470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2150470decc6SDave Kleikamp jh = bh2jh(bh); 2151470decc6SDave Kleikamp jh->b_jcount++; 2152470decc6SDave Kleikamp } 2153470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2154470decc6SDave Kleikamp return jh; 2155470decc6SDave Kleikamp } 2156470decc6SDave Kleikamp 2157470decc6SDave Kleikamp static void __journal_remove_journal_head(struct buffer_head *bh) 2158470decc6SDave Kleikamp { 2159470decc6SDave Kleikamp struct journal_head *jh = bh2jh(bh); 2160470decc6SDave Kleikamp 2161470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount >= 0); 2162de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_transaction == NULL); 2163de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_next_transaction == NULL); 2164de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); 2165470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jlist == BJ_None); 2166470decc6SDave Kleikamp J_ASSERT_BH(bh, buffer_jbd(bh)); 2167470decc6SDave Kleikamp J_ASSERT_BH(bh, jh2bh(jh) == bh); 2168470decc6SDave Kleikamp BUFFER_TRACE(bh, "remove journal_head"); 2169470decc6SDave Kleikamp if (jh->b_frozen_data) { 2170de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__); 2171af1e76d6SMingming Cao jbd2_free(jh->b_frozen_data, bh->b_size); 2172470decc6SDave Kleikamp } 2173470decc6SDave Kleikamp if (jh->b_committed_data) { 2174de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__); 2175af1e76d6SMingming Cao jbd2_free(jh->b_committed_data, bh->b_size); 2176470decc6SDave Kleikamp } 2177470decc6SDave Kleikamp bh->b_private = NULL; 2178470decc6SDave Kleikamp jh->b_bh = NULL; /* debug, really */ 2179470decc6SDave Kleikamp clear_buffer_jbd(bh); 2180470decc6SDave Kleikamp journal_free_journal_head(jh); 2181470decc6SDave Kleikamp } 2182470decc6SDave Kleikamp 2183470decc6SDave Kleikamp /* 2184de1b7941SJan Kara * Drop a reference on the passed journal_head. If it fell to zero then 2185470decc6SDave Kleikamp * release the journal_head from the buffer_head. 2186470decc6SDave Kleikamp */ 2187f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh) 2188470decc6SDave Kleikamp { 2189470decc6SDave Kleikamp struct buffer_head *bh = jh2bh(jh); 2190470decc6SDave Kleikamp 2191470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2192470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount > 0); 2193470decc6SDave Kleikamp --jh->b_jcount; 2194de1b7941SJan Kara if (!jh->b_jcount) { 2195470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2196de1b7941SJan Kara jbd_unlock_bh_journal_head(bh); 2197470decc6SDave Kleikamp __brelse(bh); 2198de1b7941SJan Kara } else 2199470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2200470decc6SDave Kleikamp } 2201470decc6SDave Kleikamp 2202470decc6SDave Kleikamp /* 2203c851ed54SJan Kara * Initialize jbd inode head 2204c851ed54SJan Kara */ 2205c851ed54SJan Kara void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) 2206c851ed54SJan Kara { 2207c851ed54SJan Kara jinode->i_transaction = NULL; 2208c851ed54SJan Kara jinode->i_next_transaction = NULL; 2209c851ed54SJan Kara jinode->i_vfs_inode = inode; 2210c851ed54SJan Kara jinode->i_flags = 0; 2211c851ed54SJan Kara INIT_LIST_HEAD(&jinode->i_list); 2212c851ed54SJan Kara } 2213c851ed54SJan Kara 2214c851ed54SJan Kara /* 2215c851ed54SJan Kara * Function to be called before we start removing inode from memory (i.e., 2216c851ed54SJan Kara * clear_inode() is a fine place to be called from). It removes inode from 2217c851ed54SJan Kara * transaction's lists. 2218c851ed54SJan Kara */ 2219c851ed54SJan Kara void jbd2_journal_release_jbd_inode(journal_t *journal, 2220c851ed54SJan Kara struct jbd2_inode *jinode) 2221c851ed54SJan Kara { 2222c851ed54SJan Kara if (!journal) 2223c851ed54SJan Kara return; 2224c851ed54SJan Kara restart: 2225c851ed54SJan Kara spin_lock(&journal->j_list_lock); 2226c851ed54SJan Kara /* Is commit writing out inode - we have to wait */ 222739e3ac25SBrian King if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) { 2228c851ed54SJan Kara wait_queue_head_t *wq; 2229c851ed54SJan Kara DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); 2230c851ed54SJan Kara wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); 2231c851ed54SJan Kara prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); 2232c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2233c851ed54SJan Kara schedule(); 2234c851ed54SJan Kara finish_wait(wq, &wait.wait); 2235c851ed54SJan Kara goto restart; 2236c851ed54SJan Kara } 2237c851ed54SJan Kara 2238c851ed54SJan Kara if (jinode->i_transaction) { 2239c851ed54SJan Kara list_del(&jinode->i_list); 2240c851ed54SJan Kara jinode->i_transaction = NULL; 2241c851ed54SJan Kara } 2242c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2243c851ed54SJan Kara } 2244c851ed54SJan Kara 2245c851ed54SJan Kara /* 22460f49d5d0SJose R. Santos * debugfs tunables 2247470decc6SDave Kleikamp */ 22486f38c74fSJose R. Santos #ifdef CONFIG_JBD2_DEBUG 22496f38c74fSJose R. Santos u8 jbd2_journal_enable_debug __read_mostly; 2250f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_enable_debug); 2251470decc6SDave Kleikamp 22520f49d5d0SJose R. Santos #define JBD2_DEBUG_NAME "jbd2-debug" 2253470decc6SDave Kleikamp 22546f38c74fSJose R. Santos static struct dentry *jbd2_debugfs_dir; 22556f38c74fSJose R. Santos static struct dentry *jbd2_debug; 22560f49d5d0SJose R. Santos 22570f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 2258470decc6SDave Kleikamp { 22590f49d5d0SJose R. Santos jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL); 22600f49d5d0SJose R. Santos if (jbd2_debugfs_dir) 2261765f8361SYin Kangkai jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, 2262765f8361SYin Kangkai S_IRUGO | S_IWUSR, 22630f49d5d0SJose R. Santos jbd2_debugfs_dir, 22640f49d5d0SJose R. Santos &jbd2_journal_enable_debug); 2265470decc6SDave Kleikamp } 2266470decc6SDave Kleikamp 22670f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 2268470decc6SDave Kleikamp { 22690f49d5d0SJose R. Santos debugfs_remove(jbd2_debug); 22700f49d5d0SJose R. Santos debugfs_remove(jbd2_debugfs_dir); 2271470decc6SDave Kleikamp } 2272470decc6SDave Kleikamp 2273470decc6SDave Kleikamp #else 2274470decc6SDave Kleikamp 22750f49d5d0SJose R. Santos static void __init jbd2_create_debugfs_entry(void) 22760f49d5d0SJose R. Santos { 22770f49d5d0SJose R. Santos } 22780f49d5d0SJose R. Santos 22790f49d5d0SJose R. Santos static void __exit jbd2_remove_debugfs_entry(void) 22800f49d5d0SJose R. Santos { 22810f49d5d0SJose R. Santos } 2282470decc6SDave Kleikamp 2283470decc6SDave Kleikamp #endif 2284470decc6SDave Kleikamp 22858e85fb3fSJohann Lombardi #ifdef CONFIG_PROC_FS 22868e85fb3fSJohann Lombardi 22878e85fb3fSJohann Lombardi #define JBD2_STATS_PROC_NAME "fs/jbd2" 22888e85fb3fSJohann Lombardi 22898e85fb3fSJohann Lombardi static void __init jbd2_create_jbd_stats_proc_entry(void) 22908e85fb3fSJohann Lombardi { 22918e85fb3fSJohann Lombardi proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); 22928e85fb3fSJohann Lombardi } 22938e85fb3fSJohann Lombardi 22948e85fb3fSJohann Lombardi static void __exit jbd2_remove_jbd_stats_proc_entry(void) 22958e85fb3fSJohann Lombardi { 22968e85fb3fSJohann Lombardi if (proc_jbd2_stats) 22978e85fb3fSJohann Lombardi remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); 22988e85fb3fSJohann Lombardi } 22998e85fb3fSJohann Lombardi 23008e85fb3fSJohann Lombardi #else 23018e85fb3fSJohann Lombardi 23028e85fb3fSJohann Lombardi #define jbd2_create_jbd_stats_proc_entry() do {} while (0) 23038e85fb3fSJohann Lombardi #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) 23048e85fb3fSJohann Lombardi 23058e85fb3fSJohann Lombardi #endif 23068e85fb3fSJohann Lombardi 23078aefcd55STheodore Ts'o struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; 2308470decc6SDave Kleikamp 23094185a2acSYongqiang Yang static int __init jbd2_journal_init_handle_cache(void) 2310470decc6SDave Kleikamp { 23118aefcd55STheodore Ts'o jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); 2312f7f4bccbSMingming Cao if (jbd2_handle_cache == NULL) { 23138aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create handle cache\n"); 23148aefcd55STheodore Ts'o return -ENOMEM; 23158aefcd55STheodore Ts'o } 23168aefcd55STheodore Ts'o jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); 23178aefcd55STheodore Ts'o if (jbd2_inode_cache == NULL) { 23188aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create inode cache\n"); 23198aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_handle_cache); 2320470decc6SDave Kleikamp return -ENOMEM; 2321470decc6SDave Kleikamp } 2322470decc6SDave Kleikamp return 0; 2323470decc6SDave Kleikamp } 2324470decc6SDave Kleikamp 2325f7f4bccbSMingming Cao static void jbd2_journal_destroy_handle_cache(void) 2326470decc6SDave Kleikamp { 2327f7f4bccbSMingming Cao if (jbd2_handle_cache) 2328f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_handle_cache); 23298aefcd55STheodore Ts'o if (jbd2_inode_cache) 23308aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_inode_cache); 23318aefcd55STheodore Ts'o 2332470decc6SDave Kleikamp } 2333470decc6SDave Kleikamp 2334470decc6SDave Kleikamp /* 2335470decc6SDave Kleikamp * Module startup and shutdown 2336470decc6SDave Kleikamp */ 2337470decc6SDave Kleikamp 2338470decc6SDave Kleikamp static int __init journal_init_caches(void) 2339470decc6SDave Kleikamp { 2340470decc6SDave Kleikamp int ret; 2341470decc6SDave Kleikamp 2342f7f4bccbSMingming Cao ret = jbd2_journal_init_revoke_caches(); 2343470decc6SDave Kleikamp if (ret == 0) 23444185a2acSYongqiang Yang ret = jbd2_journal_init_journal_head_cache(); 2345470decc6SDave Kleikamp if (ret == 0) 23464185a2acSYongqiang Yang ret = jbd2_journal_init_handle_cache(); 23470c2022ecSYongqiang Yang if (ret == 0) 23480c2022ecSYongqiang Yang ret = jbd2_journal_init_transaction_cache(); 2349470decc6SDave Kleikamp return ret; 2350470decc6SDave Kleikamp } 2351470decc6SDave Kleikamp 2352f7f4bccbSMingming Cao static void jbd2_journal_destroy_caches(void) 2353470decc6SDave Kleikamp { 2354f7f4bccbSMingming Cao jbd2_journal_destroy_revoke_caches(); 23554185a2acSYongqiang Yang jbd2_journal_destroy_journal_head_cache(); 2356f7f4bccbSMingming Cao jbd2_journal_destroy_handle_cache(); 23570c2022ecSYongqiang Yang jbd2_journal_destroy_transaction_cache(); 2358d2eecb03STheodore Ts'o jbd2_journal_destroy_slabs(); 2359470decc6SDave Kleikamp } 2360470decc6SDave Kleikamp 2361470decc6SDave Kleikamp static int __init journal_init(void) 2362470decc6SDave Kleikamp { 2363470decc6SDave Kleikamp int ret; 2364470decc6SDave Kleikamp 2365470decc6SDave Kleikamp BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); 2366470decc6SDave Kleikamp 2367470decc6SDave Kleikamp ret = journal_init_caches(); 2368620de4e1SDuane Griffin if (ret == 0) { 23690f49d5d0SJose R. Santos jbd2_create_debugfs_entry(); 23708e85fb3fSJohann Lombardi jbd2_create_jbd_stats_proc_entry(); 2371620de4e1SDuane Griffin } else { 2372620de4e1SDuane Griffin jbd2_journal_destroy_caches(); 2373620de4e1SDuane Griffin } 2374470decc6SDave Kleikamp return ret; 2375470decc6SDave Kleikamp } 2376470decc6SDave Kleikamp 2377470decc6SDave Kleikamp static void __exit journal_exit(void) 2378470decc6SDave Kleikamp { 2379e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2380470decc6SDave Kleikamp int n = atomic_read(&nr_journal_heads); 2381470decc6SDave Kleikamp if (n) 2382f2a44523SEryu Guan printk(KERN_EMERG "JBD2: leaked %d journal_heads!\n", n); 2383470decc6SDave Kleikamp #endif 23840f49d5d0SJose R. Santos jbd2_remove_debugfs_entry(); 23858e85fb3fSJohann Lombardi jbd2_remove_jbd_stats_proc_entry(); 2386f7f4bccbSMingming Cao jbd2_journal_destroy_caches(); 2387470decc6SDave Kleikamp } 2388470decc6SDave Kleikamp 2389470decc6SDave Kleikamp MODULE_LICENSE("GPL"); 2390470decc6SDave Kleikamp module_init(journal_init); 2391470decc6SDave Kleikamp module_exit(journal_exit); 2392470decc6SDave Kleikamp 2393