1f5166768STheodore Ts'o // SPDX-License-Identifier: GPL-2.0+ 2470decc6SDave Kleikamp /* 3f7f4bccbSMingming Cao * linux/fs/jbd2/journal.c 4470decc6SDave Kleikamp * 5470decc6SDave Kleikamp * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 6470decc6SDave Kleikamp * 7470decc6SDave Kleikamp * Copyright 1998 Red Hat corp --- All Rights Reserved 8470decc6SDave Kleikamp * 9470decc6SDave Kleikamp * Generic filesystem journal-writing code; part of the ext2fs 10470decc6SDave Kleikamp * journaling system. 11470decc6SDave Kleikamp * 12470decc6SDave Kleikamp * This file manages journals: areas of disk reserved for logging 13470decc6SDave Kleikamp * transactional updates. This includes the kernel journaling thread 14470decc6SDave Kleikamp * which is responsible for scheduling updates to the log. 15470decc6SDave Kleikamp * 16470decc6SDave Kleikamp * We do not actually manage the physical storage of the journal in this 17470decc6SDave Kleikamp * file: that is left to a per-journal policy function, which allows us 18470decc6SDave Kleikamp * to store the journal within a filesystem-specified area for ext2 19470decc6SDave Kleikamp * journaling (ext2 can use a reserved inode for storing the log). 20470decc6SDave Kleikamp */ 21470decc6SDave Kleikamp 22470decc6SDave Kleikamp #include <linux/module.h> 23470decc6SDave Kleikamp #include <linux/time.h> 24470decc6SDave Kleikamp #include <linux/fs.h> 25f7f4bccbSMingming Cao #include <linux/jbd2.h> 26470decc6SDave Kleikamp #include <linux/errno.h> 27470decc6SDave Kleikamp #include <linux/slab.h> 28470decc6SDave Kleikamp #include <linux/init.h> 29470decc6SDave Kleikamp #include <linux/mm.h> 307dfb7103SNigel Cunningham #include <linux/freezer.h> 31470decc6SDave Kleikamp #include <linux/pagemap.h> 32470decc6SDave Kleikamp #include <linux/kthread.h> 33470decc6SDave Kleikamp #include <linux/poison.h> 34470decc6SDave Kleikamp #include <linux/proc_fs.h> 358e85fb3fSJohann Lombardi #include <linux/seq_file.h> 36c225aa57SSimon Holm Thøgersen #include <linux/math64.h> 37879c5e6bSTheodore Ts'o #include <linux/hash.h> 38d2eecb03STheodore Ts'o #include <linux/log2.h> 39d2eecb03STheodore Ts'o #include <linux/vmalloc.h> 4047def826STheodore Ts'o #include <linux/backing-dev.h> 4139e3ac25SBrian King #include <linux/bitops.h> 42670be5a7STheodore Ts'o #include <linux/ratelimit.h> 43eb52da3fSMichal Hocko #include <linux/sched/mm.h> 44879c5e6bSTheodore Ts'o 45879c5e6bSTheodore Ts'o #define CREATE_TRACE_POINTS 46879c5e6bSTheodore Ts'o #include <trace/events/jbd2.h> 47470decc6SDave Kleikamp 487c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 49470decc6SDave Kleikamp #include <asm/page.h> 50470decc6SDave Kleikamp 51b6e96d00STheodore Ts'o #ifdef CONFIG_JBD2_DEBUG 52b6e96d00STheodore Ts'o ushort jbd2_journal_enable_debug __read_mostly; 53b6e96d00STheodore Ts'o EXPORT_SYMBOL(jbd2_journal_enable_debug); 54b6e96d00STheodore Ts'o 55b6e96d00STheodore Ts'o module_param_named(jbd2_debug, jbd2_journal_enable_debug, ushort, 0644); 56b6e96d00STheodore Ts'o MODULE_PARM_DESC(jbd2_debug, "Debugging level for jbd2"); 57b6e96d00STheodore Ts'o #endif 58b6e96d00STheodore Ts'o 59f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_extend); 60f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_stop); 61f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_lock_updates); 62f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_unlock_updates); 63f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_write_access); 64f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_create_access); 65f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_undo_access); 66e06c8227SJoel Becker EXPORT_SYMBOL(jbd2_journal_set_triggers); 67f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_dirty_metadata); 68f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_forget); 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); 926ba0e7dcSRoss Zwisler EXPORT_SYMBOL(jbd2_journal_inode_ranged_write); 936ba0e7dcSRoss Zwisler EXPORT_SYMBOL(jbd2_journal_inode_ranged_wait); 94c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); 95c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); 96c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); 978aefcd55STheodore Ts'o EXPORT_SYMBOL(jbd2_inode_cache); 98470decc6SDave Kleikamp 99470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno); 100d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t slab_size); 101470decc6SDave Kleikamp 102169f1a2aSPaul Gortmaker #ifdef CONFIG_JBD2_DEBUG 103169f1a2aSPaul Gortmaker void __jbd2_debug(int level, const char *file, const char *func, 104169f1a2aSPaul Gortmaker unsigned int line, const char *fmt, ...) 105169f1a2aSPaul Gortmaker { 106169f1a2aSPaul Gortmaker struct va_format vaf; 107169f1a2aSPaul Gortmaker va_list args; 108169f1a2aSPaul Gortmaker 109169f1a2aSPaul Gortmaker if (level > jbd2_journal_enable_debug) 110169f1a2aSPaul Gortmaker return; 111169f1a2aSPaul Gortmaker va_start(args, fmt); 112169f1a2aSPaul Gortmaker vaf.fmt = fmt; 113169f1a2aSPaul Gortmaker vaf.va = &args; 1149196f571SWang Shilong printk(KERN_DEBUG "%s: (%s, %u): %pV", file, func, line, &vaf); 115169f1a2aSPaul Gortmaker va_end(args); 116169f1a2aSPaul Gortmaker } 117169f1a2aSPaul Gortmaker EXPORT_SYMBOL(__jbd2_debug); 118169f1a2aSPaul Gortmaker #endif 119169f1a2aSPaul Gortmaker 12025ed6e8aSDarrick J. Wong /* Checksumming functions */ 1217747e6d0SRashika Kheria static int jbd2_verify_csum_type(journal_t *j, journal_superblock_t *sb) 12225ed6e8aSDarrick J. Wong { 1238595798cSDarrick J. Wong if (!jbd2_journal_has_csum_v2or3_feature(j)) 12425ed6e8aSDarrick J. Wong return 1; 12525ed6e8aSDarrick J. Wong 12625ed6e8aSDarrick J. Wong return sb->s_checksum_type == JBD2_CRC32C_CHKSUM; 12725ed6e8aSDarrick J. Wong } 12825ed6e8aSDarrick J. Wong 12918a6ea1eSDarrick J. Wong static __be32 jbd2_superblock_csum(journal_t *j, journal_superblock_t *sb) 1304fd5ea43SDarrick J. Wong { 13118a6ea1eSDarrick J. Wong __u32 csum; 13218a6ea1eSDarrick J. Wong __be32 old_csum; 1334fd5ea43SDarrick J. Wong 1344fd5ea43SDarrick J. Wong old_csum = sb->s_checksum; 1354fd5ea43SDarrick J. Wong sb->s_checksum = 0; 1364fd5ea43SDarrick J. Wong csum = jbd2_chksum(j, ~0, (char *)sb, sizeof(journal_superblock_t)); 1374fd5ea43SDarrick J. Wong sb->s_checksum = old_csum; 1384fd5ea43SDarrick J. Wong 1394fd5ea43SDarrick J. Wong return cpu_to_be32(csum); 1404fd5ea43SDarrick J. Wong } 1414fd5ea43SDarrick J. Wong 142470decc6SDave Kleikamp /* 143470decc6SDave Kleikamp * Helper function used to manage commit timeouts 144470decc6SDave Kleikamp */ 145470decc6SDave Kleikamp 146e3c95788SKees Cook static void commit_timeout(struct timer_list *t) 147470decc6SDave Kleikamp { 148e3c95788SKees Cook journal_t *journal = from_timer(journal, t, j_commit_timer); 149470decc6SDave Kleikamp 150e3c95788SKees Cook wake_up_process(journal->j_task); 151470decc6SDave Kleikamp } 152470decc6SDave Kleikamp 153470decc6SDave Kleikamp /* 154f7f4bccbSMingming Cao * kjournald2: The main thread function used to manage a logging device 155470decc6SDave Kleikamp * journal. 156470decc6SDave Kleikamp * 157470decc6SDave Kleikamp * This kernel thread is responsible for two things: 158470decc6SDave Kleikamp * 159470decc6SDave Kleikamp * 1) COMMIT: Every so often we need to commit the current state of the 160470decc6SDave Kleikamp * filesystem to disk. The journal thread is responsible for writing 161470decc6SDave Kleikamp * all of the metadata buffers to disk. 162470decc6SDave Kleikamp * 163470decc6SDave Kleikamp * 2) CHECKPOINT: We cannot reuse a used section of the log file until all 164470decc6SDave Kleikamp * of the data in that part of the log has been rewritten elsewhere on 165470decc6SDave Kleikamp * the disk. Flushing these old buffers to reclaim space in the log is 166470decc6SDave Kleikamp * known as checkpointing, and this thread is responsible for that job. 167470decc6SDave Kleikamp */ 168470decc6SDave Kleikamp 169f7f4bccbSMingming Cao static int kjournald2(void *arg) 170470decc6SDave Kleikamp { 171470decc6SDave Kleikamp journal_t *journal = arg; 172470decc6SDave Kleikamp transaction_t *transaction; 173470decc6SDave Kleikamp 174470decc6SDave Kleikamp /* 175470decc6SDave Kleikamp * Set up an interval timer which can be used to trigger a commit wakeup 176470decc6SDave Kleikamp * after the commit interval expires 177470decc6SDave Kleikamp */ 178e3c95788SKees Cook timer_setup(&journal->j_commit_timer, commit_timeout, 0); 179470decc6SDave Kleikamp 18035c80422SNigel Cunningham set_freezable(); 18135c80422SNigel Cunningham 182470decc6SDave Kleikamp /* Record that the journal thread is running */ 183470decc6SDave Kleikamp journal->j_task = current; 184470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 185470decc6SDave Kleikamp 186470decc6SDave Kleikamp /* 187eb52da3fSMichal Hocko * Make sure that no allocations from this kernel thread will ever 188eb52da3fSMichal Hocko * recurse to the fs layer because we are responsible for the 189eb52da3fSMichal Hocko * transaction commit and any fs involvement might get stuck waiting for 190eb52da3fSMichal Hocko * the trasn. commit. 191eb52da3fSMichal Hocko */ 192eb52da3fSMichal Hocko memalloc_nofs_save(); 193eb52da3fSMichal Hocko 194eb52da3fSMichal Hocko /* 195470decc6SDave Kleikamp * And now, wait forever for commit wakeup events. 196470decc6SDave Kleikamp */ 197a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 198470decc6SDave Kleikamp 199470decc6SDave Kleikamp loop: 200f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 201470decc6SDave Kleikamp goto end_loop; 202470decc6SDave Kleikamp 2037821ce41SGaowei Pu jbd_debug(1, "commit_sequence=%u, commit_request=%u\n", 204470decc6SDave Kleikamp journal->j_commit_sequence, journal->j_commit_request); 205470decc6SDave Kleikamp 206470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) { 207470decc6SDave Kleikamp jbd_debug(1, "OK, requests differ\n"); 208a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 209470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 210f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 211a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 212470decc6SDave Kleikamp goto loop; 213470decc6SDave Kleikamp } 214470decc6SDave Kleikamp 215470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 216470decc6SDave Kleikamp if (freezing(current)) { 217470decc6SDave Kleikamp /* 218470decc6SDave Kleikamp * The simpler the better. Flushing journal isn't a 219470decc6SDave Kleikamp * good idea, because that depends on threads that may 220470decc6SDave Kleikamp * be already stopped. 221470decc6SDave Kleikamp */ 222f7f4bccbSMingming Cao jbd_debug(1, "Now suspending kjournald2\n"); 223a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 224a0acae0eSTejun Heo try_to_freeze(); 225a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 226470decc6SDave Kleikamp } else { 227470decc6SDave Kleikamp /* 228470decc6SDave Kleikamp * We assume on resume that commits are already there, 229470decc6SDave Kleikamp * so we don't sleep 230470decc6SDave Kleikamp */ 231470decc6SDave Kleikamp DEFINE_WAIT(wait); 232470decc6SDave Kleikamp int should_sleep = 1; 233470decc6SDave Kleikamp 234470decc6SDave Kleikamp prepare_to_wait(&journal->j_wait_commit, &wait, 235470decc6SDave Kleikamp TASK_INTERRUPTIBLE); 236470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) 237470decc6SDave Kleikamp should_sleep = 0; 238470decc6SDave Kleikamp transaction = journal->j_running_transaction; 239470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, 240470decc6SDave Kleikamp transaction->t_expires)) 241470decc6SDave Kleikamp should_sleep = 0; 242f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 243470decc6SDave Kleikamp should_sleep = 0; 244470decc6SDave Kleikamp if (should_sleep) { 245a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 246470decc6SDave Kleikamp schedule(); 247a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 248470decc6SDave Kleikamp } 249470decc6SDave Kleikamp finish_wait(&journal->j_wait_commit, &wait); 250470decc6SDave Kleikamp } 251470decc6SDave Kleikamp 252f7f4bccbSMingming Cao jbd_debug(1, "kjournald2 wakes\n"); 253470decc6SDave Kleikamp 254470decc6SDave Kleikamp /* 255470decc6SDave Kleikamp * Were we woken up by a commit wakeup event? 256470decc6SDave Kleikamp */ 257470decc6SDave Kleikamp transaction = journal->j_running_transaction; 258470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, transaction->t_expires)) { 259470decc6SDave Kleikamp journal->j_commit_request = transaction->t_tid; 260470decc6SDave Kleikamp jbd_debug(1, "woke because of timeout\n"); 261470decc6SDave Kleikamp } 262470decc6SDave Kleikamp goto loop; 263470decc6SDave Kleikamp 264470decc6SDave Kleikamp end_loop: 265470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 266470decc6SDave Kleikamp journal->j_task = NULL; 267470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 268470decc6SDave Kleikamp jbd_debug(1, "Journal thread exiting.\n"); 269dbfcef6bSSahitya Tummala write_unlock(&journal->j_state_lock); 270470decc6SDave Kleikamp return 0; 271470decc6SDave Kleikamp } 272470decc6SDave Kleikamp 27397f06784SPavel Emelianov static int jbd2_journal_start_thread(journal_t *journal) 274470decc6SDave Kleikamp { 27597f06784SPavel Emelianov struct task_struct *t; 27697f06784SPavel Emelianov 27790576c0bSTheodore Ts'o t = kthread_run(kjournald2, journal, "jbd2/%s", 27890576c0bSTheodore Ts'o journal->j_devname); 27997f06784SPavel Emelianov if (IS_ERR(t)) 28097f06784SPavel Emelianov return PTR_ERR(t); 28197f06784SPavel Emelianov 2821076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task != NULL); 28397f06784SPavel Emelianov return 0; 284470decc6SDave Kleikamp } 285470decc6SDave Kleikamp 286470decc6SDave Kleikamp static void journal_kill_thread(journal_t *journal) 287470decc6SDave Kleikamp { 288a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 289f7f4bccbSMingming Cao journal->j_flags |= JBD2_UNMOUNT; 290470decc6SDave Kleikamp 291470decc6SDave Kleikamp while (journal->j_task) { 292a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2933469a32aSTheodore Ts'o wake_up(&journal->j_wait_commit); 2941076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task == NULL); 295a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 296470decc6SDave Kleikamp } 297a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 298470decc6SDave Kleikamp } 299470decc6SDave Kleikamp 300470decc6SDave Kleikamp /* 301f7f4bccbSMingming Cao * jbd2_journal_write_metadata_buffer: write a metadata buffer to the journal. 302470decc6SDave Kleikamp * 303470decc6SDave Kleikamp * Writes a metadata buffer to a given disk block. The actual IO is not 304470decc6SDave Kleikamp * performed but a new buffer_head is constructed which labels the data 305470decc6SDave Kleikamp * to be written with the correct destination disk block. 306470decc6SDave Kleikamp * 307470decc6SDave Kleikamp * Any magic-number escaping which needs to be done will cause a 308470decc6SDave Kleikamp * copy-out here. If the buffer happens to start with the 309f7f4bccbSMingming Cao * JBD2_MAGIC_NUMBER, then we can't write it to the log directly: the 310470decc6SDave Kleikamp * magic number is only written to the log for descripter blocks. In 311470decc6SDave Kleikamp * this case, we copy the data and replace the first word with 0, and we 312470decc6SDave Kleikamp * return a result code which indicates that this buffer needs to be 313470decc6SDave Kleikamp * marked as an escaped buffer in the corresponding log descriptor 314470decc6SDave Kleikamp * block. The missing word can then be restored when the block is read 315470decc6SDave Kleikamp * during recovery. 316470decc6SDave Kleikamp * 317470decc6SDave Kleikamp * If the source buffer has already been modified by a new transaction 318470decc6SDave Kleikamp * since we took the last commit snapshot, we use the frozen copy of 319470decc6SDave Kleikamp * that data for IO. If we end up using the existing buffer_head's data 320f5113effSJan Kara * for the write, then we have to make sure nobody modifies it while the 321f5113effSJan Kara * IO is in progress. do_get_write_access() handles this. 322470decc6SDave Kleikamp * 323f5113effSJan Kara * The function returns a pointer to the buffer_head to be used for IO. 324470decc6SDave Kleikamp * 325470decc6SDave Kleikamp * 326470decc6SDave Kleikamp * Return value: 327470decc6SDave Kleikamp * <0: Error 328470decc6SDave Kleikamp * >=0: Finished OK 329470decc6SDave Kleikamp * 330470decc6SDave Kleikamp * On success: 331470decc6SDave Kleikamp * Bit 0 set == escape performed on the data 332470decc6SDave Kleikamp * Bit 1 set == buffer copy-out performed (kfree the data after IO) 333470decc6SDave Kleikamp */ 334470decc6SDave Kleikamp 335f7f4bccbSMingming Cao int jbd2_journal_write_metadata_buffer(transaction_t *transaction, 336470decc6SDave Kleikamp struct journal_head *jh_in, 337f5113effSJan Kara struct buffer_head **bh_out, 338f5113effSJan Kara sector_t blocknr) 339470decc6SDave Kleikamp { 340470decc6SDave Kleikamp int need_copy_out = 0; 341470decc6SDave Kleikamp int done_copy_out = 0; 342470decc6SDave Kleikamp int do_escape = 0; 343470decc6SDave Kleikamp char *mapped_data; 344470decc6SDave Kleikamp struct buffer_head *new_bh; 345470decc6SDave Kleikamp struct page *new_page; 346470decc6SDave Kleikamp unsigned int new_offset; 347470decc6SDave Kleikamp struct buffer_head *bh_in = jh2bh(jh_in); 34896577c43Sdingdinghua journal_t *journal = transaction->t_journal; 349470decc6SDave Kleikamp 350470decc6SDave Kleikamp /* 351470decc6SDave Kleikamp * The buffer really shouldn't be locked: only the current committing 352470decc6SDave Kleikamp * transaction is allowed to write it, so nobody else is allowed 353470decc6SDave Kleikamp * to do any IO. 354470decc6SDave Kleikamp * 355470decc6SDave Kleikamp * akpm: except if we're journalling data, and write() output is 356470decc6SDave Kleikamp * also part of a shared mapping, and another thread has 357470decc6SDave Kleikamp * decided to launch a writepage() against this buffer. 358470decc6SDave Kleikamp */ 359470decc6SDave Kleikamp J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in)); 360470decc6SDave Kleikamp 3616ccaf3e2SMichal Hocko new_bh = alloc_buffer_head(GFP_NOFS|__GFP_NOFAIL); 36247def826STheodore Ts'o 36396577c43Sdingdinghua /* keep subsequent assertions sane */ 36496577c43Sdingdinghua atomic_set(&new_bh->b_count, 1); 365470decc6SDave Kleikamp 36646417064SThomas Gleixner spin_lock(&jh_in->b_state_lock); 367f5113effSJan Kara repeat: 368470decc6SDave Kleikamp /* 369470decc6SDave Kleikamp * If a new transaction has already done a buffer copy-out, then 370470decc6SDave Kleikamp * we use that version of the data for the commit. 371470decc6SDave Kleikamp */ 372470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 373470decc6SDave Kleikamp done_copy_out = 1; 374470decc6SDave Kleikamp new_page = virt_to_page(jh_in->b_frozen_data); 375470decc6SDave Kleikamp new_offset = offset_in_page(jh_in->b_frozen_data); 376470decc6SDave Kleikamp } else { 377470decc6SDave Kleikamp new_page = jh2bh(jh_in)->b_page; 378470decc6SDave Kleikamp new_offset = offset_in_page(jh2bh(jh_in)->b_data); 379470decc6SDave Kleikamp } 380470decc6SDave Kleikamp 381303a8f2aSCong Wang mapped_data = kmap_atomic(new_page); 382470decc6SDave Kleikamp /* 38313ceef09SJan Kara * Fire data frozen trigger if data already wasn't frozen. Do this 38413ceef09SJan Kara * before checking for escaping, as the trigger may modify the magic 38513ceef09SJan Kara * offset. If a copy-out happens afterwards, it will have the correct 38613ceef09SJan Kara * data in the buffer. 387e06c8227SJoel Becker */ 38813ceef09SJan Kara if (!done_copy_out) 38913ceef09SJan Kara jbd2_buffer_frozen_trigger(jh_in, mapped_data + new_offset, 39013ceef09SJan Kara jh_in->b_triggers); 391e06c8227SJoel Becker 392e06c8227SJoel Becker /* 393470decc6SDave Kleikamp * Check for escaping 394470decc6SDave Kleikamp */ 395470decc6SDave Kleikamp if (*((__be32 *)(mapped_data + new_offset)) == 396f7f4bccbSMingming Cao cpu_to_be32(JBD2_MAGIC_NUMBER)) { 397470decc6SDave Kleikamp need_copy_out = 1; 398470decc6SDave Kleikamp do_escape = 1; 399470decc6SDave Kleikamp } 400303a8f2aSCong Wang kunmap_atomic(mapped_data); 401470decc6SDave Kleikamp 402470decc6SDave Kleikamp /* 403470decc6SDave Kleikamp * Do we need to do a data copy? 404470decc6SDave Kleikamp */ 405470decc6SDave Kleikamp if (need_copy_out && !done_copy_out) { 406470decc6SDave Kleikamp char *tmp; 407470decc6SDave Kleikamp 40846417064SThomas Gleixner spin_unlock(&jh_in->b_state_lock); 409af1e76d6SMingming Cao tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS); 410e6ec116bSTheodore Ts'o if (!tmp) { 411f5113effSJan Kara brelse(new_bh); 412e6ec116bSTheodore Ts'o return -ENOMEM; 413e6ec116bSTheodore Ts'o } 41446417064SThomas Gleixner spin_lock(&jh_in->b_state_lock); 415470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 416af1e76d6SMingming Cao jbd2_free(tmp, bh_in->b_size); 417470decc6SDave Kleikamp goto repeat; 418470decc6SDave Kleikamp } 419470decc6SDave Kleikamp 420470decc6SDave Kleikamp jh_in->b_frozen_data = tmp; 421303a8f2aSCong Wang mapped_data = kmap_atomic(new_page); 422f5113effSJan Kara memcpy(tmp, mapped_data + new_offset, bh_in->b_size); 423303a8f2aSCong Wang kunmap_atomic(mapped_data); 424470decc6SDave Kleikamp 425470decc6SDave Kleikamp new_page = virt_to_page(tmp); 426470decc6SDave Kleikamp new_offset = offset_in_page(tmp); 427470decc6SDave Kleikamp done_copy_out = 1; 428e06c8227SJoel Becker 429e06c8227SJoel Becker /* 430e06c8227SJoel Becker * This isn't strictly necessary, as we're using frozen 431e06c8227SJoel Becker * data for the escaping, but it keeps consistency with 432e06c8227SJoel Becker * b_frozen_data usage. 433e06c8227SJoel Becker */ 434e06c8227SJoel Becker jh_in->b_frozen_triggers = jh_in->b_triggers; 435470decc6SDave Kleikamp } 436470decc6SDave Kleikamp 437470decc6SDave Kleikamp /* 438470decc6SDave Kleikamp * Did we need to do an escaping? Now we've done all the 439470decc6SDave Kleikamp * copying, we can finally do so. 440470decc6SDave Kleikamp */ 441470decc6SDave Kleikamp if (do_escape) { 442303a8f2aSCong Wang mapped_data = kmap_atomic(new_page); 443470decc6SDave Kleikamp *((unsigned int *)(mapped_data + new_offset)) = 0; 444303a8f2aSCong Wang kunmap_atomic(mapped_data); 445470decc6SDave Kleikamp } 446470decc6SDave Kleikamp 447470decc6SDave Kleikamp set_bh_page(new_bh, new_page, new_offset); 448f5113effSJan Kara new_bh->b_size = bh_in->b_size; 449f5113effSJan Kara new_bh->b_bdev = journal->j_dev; 450470decc6SDave Kleikamp new_bh->b_blocknr = blocknr; 451b34090e5SJan Kara new_bh->b_private = bh_in; 452470decc6SDave Kleikamp set_buffer_mapped(new_bh); 453470decc6SDave Kleikamp set_buffer_dirty(new_bh); 454470decc6SDave Kleikamp 455f5113effSJan Kara *bh_out = new_bh; 456470decc6SDave Kleikamp 457470decc6SDave Kleikamp /* 458470decc6SDave Kleikamp * The to-be-written buffer needs to get moved to the io queue, 459470decc6SDave Kleikamp * and the original buffer whose contents we are shadowing or 460470decc6SDave Kleikamp * copying is moved to the transaction's shadow queue. 461470decc6SDave Kleikamp */ 462470decc6SDave Kleikamp JBUFFER_TRACE(jh_in, "file as BJ_Shadow"); 46396577c43Sdingdinghua spin_lock(&journal->j_list_lock); 46496577c43Sdingdinghua __jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow); 46596577c43Sdingdinghua spin_unlock(&journal->j_list_lock); 466b34090e5SJan Kara set_buffer_shadow(bh_in); 46746417064SThomas Gleixner spin_unlock(&jh_in->b_state_lock); 46896577c43Sdingdinghua 469470decc6SDave Kleikamp return do_escape | (done_copy_out << 1); 470470decc6SDave Kleikamp } 471470decc6SDave Kleikamp 472470decc6SDave Kleikamp /* 473470decc6SDave Kleikamp * Allocation code for the journal file. Manage the space left in the 474470decc6SDave Kleikamp * journal, so that we can begin checkpointing when appropriate. 475470decc6SDave Kleikamp */ 476470decc6SDave Kleikamp 477470decc6SDave Kleikamp /* 478e4471831STheodore Ts'o * Called with j_state_lock locked for writing. 479e4471831STheodore Ts'o * Returns true if a transaction commit was started. 480470decc6SDave Kleikamp */ 481f7f4bccbSMingming Cao int __jbd2_log_start_commit(journal_t *journal, tid_t target) 482470decc6SDave Kleikamp { 483e7b04ac0SEric Sandeen /* Return if the txn has already requested to be committed */ 484e7b04ac0SEric Sandeen if (journal->j_commit_request == target) 485e7b04ac0SEric Sandeen return 0; 486e7b04ac0SEric Sandeen 487470decc6SDave Kleikamp /* 488deeeaf13STheodore Ts'o * The only transaction we can possibly wait upon is the 489deeeaf13STheodore Ts'o * currently running transaction (if it exists). Otherwise, 490deeeaf13STheodore Ts'o * the target tid must be an old one. 491470decc6SDave Kleikamp */ 492deeeaf13STheodore Ts'o if (journal->j_running_transaction && 493deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid == target) { 494470decc6SDave Kleikamp /* 495bcf3d0bcSAndrea Gelmini * We want a new commit: OK, mark the request and wakeup the 496470decc6SDave Kleikamp * commit thread. We do _not_ do the commit ourselves. 497470decc6SDave Kleikamp */ 498470decc6SDave Kleikamp 499470decc6SDave Kleikamp journal->j_commit_request = target; 5007821ce41SGaowei Pu jbd_debug(1, "JBD2: requesting commit %u/%u\n", 501470decc6SDave Kleikamp journal->j_commit_request, 502470decc6SDave Kleikamp journal->j_commit_sequence); 5039fff24aaSTheodore Ts'o journal->j_running_transaction->t_requested = jiffies; 504470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 505470decc6SDave Kleikamp return 1; 506deeeaf13STheodore Ts'o } else if (!tid_geq(journal->j_commit_request, target)) 507deeeaf13STheodore Ts'o /* This should never happen, but if it does, preserve 508deeeaf13STheodore Ts'o the evidence before kjournald goes into a loop and 509deeeaf13STheodore Ts'o increments j_commit_sequence beyond all recognition. */ 510f2a44523SEryu Guan WARN_ONCE(1, "JBD2: bad log_start_commit: %u %u %u %u\n", 5111be2add6STheodore Ts'o journal->j_commit_request, 5121be2add6STheodore Ts'o journal->j_commit_sequence, 513deeeaf13STheodore Ts'o target, journal->j_running_transaction ? 514deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid : 0); 515470decc6SDave Kleikamp return 0; 516470decc6SDave Kleikamp } 517470decc6SDave Kleikamp 518f7f4bccbSMingming Cao int jbd2_log_start_commit(journal_t *journal, tid_t tid) 519470decc6SDave Kleikamp { 520470decc6SDave Kleikamp int ret; 521470decc6SDave Kleikamp 522a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 523f7f4bccbSMingming Cao ret = __jbd2_log_start_commit(journal, tid); 524a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 525470decc6SDave Kleikamp return ret; 526470decc6SDave Kleikamp } 527470decc6SDave Kleikamp 528470decc6SDave Kleikamp /* 5299ff86446SDmitry Monakhov * Force and wait any uncommitted transactions. We can only force the running 5309ff86446SDmitry Monakhov * transaction if we don't have an active handle, otherwise, we will deadlock. 5319ff86446SDmitry Monakhov * Returns: <0 in case of error, 5329ff86446SDmitry Monakhov * 0 if nothing to commit, 5339ff86446SDmitry Monakhov * 1 if transaction was successfully committed. 534470decc6SDave Kleikamp */ 5359ff86446SDmitry Monakhov static int __jbd2_journal_force_commit(journal_t *journal) 536470decc6SDave Kleikamp { 537470decc6SDave Kleikamp transaction_t *transaction = NULL; 538470decc6SDave Kleikamp tid_t tid; 5399ff86446SDmitry Monakhov int need_to_start = 0, ret = 0; 540470decc6SDave Kleikamp 541a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 542470decc6SDave Kleikamp if (journal->j_running_transaction && !current->journal_info) { 543470decc6SDave Kleikamp transaction = journal->j_running_transaction; 544e4471831STheodore Ts'o if (!tid_geq(journal->j_commit_request, transaction->t_tid)) 545e4471831STheodore Ts'o need_to_start = 1; 546470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 547470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 548470decc6SDave Kleikamp 549470decc6SDave Kleikamp if (!transaction) { 5509ff86446SDmitry Monakhov /* Nothing to commit */ 551a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 5529ff86446SDmitry Monakhov return 0; 553470decc6SDave Kleikamp } 554470decc6SDave Kleikamp tid = transaction->t_tid; 555a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 556e4471831STheodore Ts'o if (need_to_start) 557e4471831STheodore Ts'o jbd2_log_start_commit(journal, tid); 5589ff86446SDmitry Monakhov ret = jbd2_log_wait_commit(journal, tid); 5599ff86446SDmitry Monakhov if (!ret) 5609ff86446SDmitry Monakhov ret = 1; 5619ff86446SDmitry Monakhov 5629ff86446SDmitry Monakhov return ret; 5639ff86446SDmitry Monakhov } 5649ff86446SDmitry Monakhov 5659ff86446SDmitry Monakhov /** 5669ff86446SDmitry Monakhov * Force and wait upon a commit if the calling process is not within 5679ff86446SDmitry Monakhov * transaction. This is used for forcing out undo-protected data which contains 5689ff86446SDmitry Monakhov * bitmaps, when the fs is running out of space. 5699ff86446SDmitry Monakhov * 5709ff86446SDmitry Monakhov * @journal: journal to force 5719ff86446SDmitry Monakhov * Returns true if progress was made. 5729ff86446SDmitry Monakhov */ 5739ff86446SDmitry Monakhov int jbd2_journal_force_commit_nested(journal_t *journal) 5749ff86446SDmitry Monakhov { 5759ff86446SDmitry Monakhov int ret; 5769ff86446SDmitry Monakhov 5779ff86446SDmitry Monakhov ret = __jbd2_journal_force_commit(journal); 5789ff86446SDmitry Monakhov return ret > 0; 5799ff86446SDmitry Monakhov } 5809ff86446SDmitry Monakhov 5819ff86446SDmitry Monakhov /** 5829ff86446SDmitry Monakhov * int journal_force_commit() - force any uncommitted transactions 5839ff86446SDmitry Monakhov * @journal: journal to force 5849ff86446SDmitry Monakhov * 5859ff86446SDmitry Monakhov * Caller want unconditional commit. We can only force the running transaction 5869ff86446SDmitry Monakhov * if we don't have an active handle, otherwise, we will deadlock. 5879ff86446SDmitry Monakhov */ 5889ff86446SDmitry Monakhov int jbd2_journal_force_commit(journal_t *journal) 5899ff86446SDmitry Monakhov { 5909ff86446SDmitry Monakhov int ret; 5919ff86446SDmitry Monakhov 5929ff86446SDmitry Monakhov J_ASSERT(!current->journal_info); 5939ff86446SDmitry Monakhov ret = __jbd2_journal_force_commit(journal); 5949ff86446SDmitry Monakhov if (ret > 0) 5959ff86446SDmitry Monakhov ret = 0; 5969ff86446SDmitry Monakhov return ret; 597470decc6SDave Kleikamp } 598470decc6SDave Kleikamp 599470decc6SDave Kleikamp /* 600470decc6SDave Kleikamp * Start a commit of the current running transaction (if any). Returns true 601c88ccea3SJan Kara * if a transaction is going to be committed (or is currently already 602c88ccea3SJan Kara * committing), and fills its tid in at *ptid 603470decc6SDave Kleikamp */ 604f7f4bccbSMingming Cao int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) 605470decc6SDave Kleikamp { 606470decc6SDave Kleikamp int ret = 0; 607470decc6SDave Kleikamp 608a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 609470decc6SDave Kleikamp if (journal->j_running_transaction) { 610470decc6SDave Kleikamp tid_t tid = journal->j_running_transaction->t_tid; 611470decc6SDave Kleikamp 612c88ccea3SJan Kara __jbd2_log_start_commit(journal, tid); 613c88ccea3SJan Kara /* There's a running transaction and we've just made sure 614c88ccea3SJan Kara * it's commit has been scheduled. */ 615c88ccea3SJan Kara if (ptid) 616470decc6SDave Kleikamp *ptid = tid; 617c88ccea3SJan Kara ret = 1; 618c88ccea3SJan Kara } else if (journal->j_committing_transaction) { 619470decc6SDave Kleikamp /* 62012810ad7SArtem Bityutskiy * If commit has been started, then we have to wait for 62112810ad7SArtem Bityutskiy * completion of that transaction. 622470decc6SDave Kleikamp */ 623c88ccea3SJan Kara if (ptid) 624470decc6SDave Kleikamp *ptid = journal->j_committing_transaction->t_tid; 625470decc6SDave Kleikamp ret = 1; 626470decc6SDave Kleikamp } 627a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 628470decc6SDave Kleikamp return ret; 629470decc6SDave Kleikamp } 630470decc6SDave Kleikamp 631470decc6SDave Kleikamp /* 632bbd2be36SJan Kara * Return 1 if a given transaction has not yet sent barrier request 633bbd2be36SJan Kara * connected with a transaction commit. If 0 is returned, transaction 634bbd2be36SJan Kara * may or may not have sent the barrier. Used to avoid sending barrier 635bbd2be36SJan Kara * twice in common cases. 636bbd2be36SJan Kara */ 637bbd2be36SJan Kara int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid) 638bbd2be36SJan Kara { 639bbd2be36SJan Kara int ret = 0; 640bbd2be36SJan Kara transaction_t *commit_trans; 641bbd2be36SJan Kara 642bbd2be36SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 643bbd2be36SJan Kara return 0; 644bbd2be36SJan Kara read_lock(&journal->j_state_lock); 645bbd2be36SJan Kara /* Transaction already committed? */ 646bbd2be36SJan Kara if (tid_geq(journal->j_commit_sequence, tid)) 647bbd2be36SJan Kara goto out; 648bbd2be36SJan Kara commit_trans = journal->j_committing_transaction; 649bbd2be36SJan Kara if (!commit_trans || commit_trans->t_tid != tid) { 650bbd2be36SJan Kara ret = 1; 651bbd2be36SJan Kara goto out; 652bbd2be36SJan Kara } 653bbd2be36SJan Kara /* 654bbd2be36SJan Kara * Transaction is being committed and we already proceeded to 655bbd2be36SJan Kara * submitting a flush to fs partition? 656bbd2be36SJan Kara */ 657bbd2be36SJan Kara if (journal->j_fs_dev != journal->j_dev) { 658bbd2be36SJan Kara if (!commit_trans->t_need_data_flush || 659bbd2be36SJan Kara commit_trans->t_state >= T_COMMIT_DFLUSH) 660bbd2be36SJan Kara goto out; 661bbd2be36SJan Kara } else { 662bbd2be36SJan Kara if (commit_trans->t_state >= T_COMMIT_JFLUSH) 663bbd2be36SJan Kara goto out; 664bbd2be36SJan Kara } 665bbd2be36SJan Kara ret = 1; 666bbd2be36SJan Kara out: 667bbd2be36SJan Kara read_unlock(&journal->j_state_lock); 668bbd2be36SJan Kara return ret; 669bbd2be36SJan Kara } 670bbd2be36SJan Kara EXPORT_SYMBOL(jbd2_trans_will_send_data_barrier); 671bbd2be36SJan Kara 672bbd2be36SJan Kara /* 673470decc6SDave Kleikamp * Wait for a specified commit to complete. 674470decc6SDave Kleikamp * The caller may not hold the journal lock. 675470decc6SDave Kleikamp */ 676f7f4bccbSMingming Cao int jbd2_log_wait_commit(journal_t *journal, tid_t tid) 677470decc6SDave Kleikamp { 678470decc6SDave Kleikamp int err = 0; 679470decc6SDave Kleikamp 680c52c47e4SJan Kara read_lock(&journal->j_state_lock); 681c52c47e4SJan Kara #ifdef CONFIG_PROVE_LOCKING 682c52c47e4SJan Kara /* 683c52c47e4SJan Kara * Some callers make sure transaction is already committing and in that 684c52c47e4SJan Kara * case we cannot block on open handles anymore. So don't warn in that 685c52c47e4SJan Kara * case. 686c52c47e4SJan Kara */ 687c52c47e4SJan Kara if (tid_gt(tid, journal->j_commit_sequence) && 688c52c47e4SJan Kara (!journal->j_committing_transaction || 689c52c47e4SJan Kara journal->j_committing_transaction->t_tid != tid)) { 690c52c47e4SJan Kara read_unlock(&journal->j_state_lock); 6911eaa566dSJan Kara jbd2_might_wait_for_commit(journal); 692a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 693c52c47e4SJan Kara } 694c52c47e4SJan Kara #endif 695e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 696470decc6SDave Kleikamp if (!tid_geq(journal->j_commit_request, tid)) { 69775685071SJan Kara printk(KERN_ERR 6987821ce41SGaowei Pu "%s: error: j_commit_request=%u, tid=%u\n", 699329d291fSHarvey Harrison __func__, journal->j_commit_request, tid); 700470decc6SDave Kleikamp } 701470decc6SDave Kleikamp #endif 702470decc6SDave Kleikamp while (tid_gt(tid, journal->j_commit_sequence)) { 7037821ce41SGaowei Pu jbd_debug(1, "JBD2: want %u, j_commit_sequence=%u\n", 704470decc6SDave Kleikamp tid, journal->j_commit_sequence); 705a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 7063469a32aSTheodore Ts'o wake_up(&journal->j_wait_commit); 707470decc6SDave Kleikamp wait_event(journal->j_wait_done_commit, 708470decc6SDave Kleikamp !tid_gt(tid, journal->j_commit_sequence)); 709a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 710470decc6SDave Kleikamp } 711a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 712470decc6SDave Kleikamp 71375685071SJan Kara if (unlikely(is_journal_aborted(journal))) 714470decc6SDave Kleikamp err = -EIO; 715470decc6SDave Kleikamp return err; 716470decc6SDave Kleikamp } 717470decc6SDave Kleikamp 718b8a6176cSJan Kara /* Return 1 when transaction with given tid has already committed. */ 719b8a6176cSJan Kara int jbd2_transaction_committed(journal_t *journal, tid_t tid) 720b8a6176cSJan Kara { 721b8a6176cSJan Kara int ret = 1; 722b8a6176cSJan Kara 723b8a6176cSJan Kara read_lock(&journal->j_state_lock); 724b8a6176cSJan Kara if (journal->j_running_transaction && 725b8a6176cSJan Kara journal->j_running_transaction->t_tid == tid) 726b8a6176cSJan Kara ret = 0; 727b8a6176cSJan Kara if (journal->j_committing_transaction && 728b8a6176cSJan Kara journal->j_committing_transaction->t_tid == tid) 729b8a6176cSJan Kara ret = 0; 730b8a6176cSJan Kara read_unlock(&journal->j_state_lock); 731b8a6176cSJan Kara return ret; 732b8a6176cSJan Kara } 733b8a6176cSJan Kara EXPORT_SYMBOL(jbd2_transaction_committed); 734b8a6176cSJan Kara 735470decc6SDave Kleikamp /* 736d76a3a77STheodore Ts'o * When this function returns the transaction corresponding to tid 737d76a3a77STheodore Ts'o * will be completed. If the transaction has currently running, start 738d76a3a77STheodore Ts'o * committing that transaction before waiting for it to complete. If 739d76a3a77STheodore Ts'o * the transaction id is stale, it is by definition already completed, 740d76a3a77STheodore Ts'o * so just return SUCCESS. 741d76a3a77STheodore Ts'o */ 742d76a3a77STheodore Ts'o int jbd2_complete_transaction(journal_t *journal, tid_t tid) 743d76a3a77STheodore Ts'o { 744d76a3a77STheodore Ts'o int need_to_wait = 1; 745d76a3a77STheodore Ts'o 746d76a3a77STheodore Ts'o read_lock(&journal->j_state_lock); 747d76a3a77STheodore Ts'o if (journal->j_running_transaction && 748d76a3a77STheodore Ts'o journal->j_running_transaction->t_tid == tid) { 749d76a3a77STheodore Ts'o if (journal->j_commit_request != tid) { 750d76a3a77STheodore Ts'o /* transaction not yet started, so request it */ 751d76a3a77STheodore Ts'o read_unlock(&journal->j_state_lock); 752d76a3a77STheodore Ts'o jbd2_log_start_commit(journal, tid); 753d76a3a77STheodore Ts'o goto wait_commit; 754d76a3a77STheodore Ts'o } 755d76a3a77STheodore Ts'o } else if (!(journal->j_committing_transaction && 756d76a3a77STheodore Ts'o journal->j_committing_transaction->t_tid == tid)) 757d76a3a77STheodore Ts'o need_to_wait = 0; 758d76a3a77STheodore Ts'o read_unlock(&journal->j_state_lock); 759d76a3a77STheodore Ts'o if (!need_to_wait) 760d76a3a77STheodore Ts'o return 0; 761d76a3a77STheodore Ts'o wait_commit: 762d76a3a77STheodore Ts'o return jbd2_log_wait_commit(journal, tid); 763d76a3a77STheodore Ts'o } 764d76a3a77STheodore Ts'o EXPORT_SYMBOL(jbd2_complete_transaction); 765d76a3a77STheodore Ts'o 766d76a3a77STheodore Ts'o /* 767470decc6SDave Kleikamp * Log buffer allocation routines: 768470decc6SDave Kleikamp */ 769470decc6SDave Kleikamp 77018eba7aaSMingming Cao int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) 771470decc6SDave Kleikamp { 772470decc6SDave Kleikamp unsigned long blocknr; 773470decc6SDave Kleikamp 774a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 775470decc6SDave Kleikamp J_ASSERT(journal->j_free > 1); 776470decc6SDave Kleikamp 777470decc6SDave Kleikamp blocknr = journal->j_head; 778470decc6SDave Kleikamp journal->j_head++; 779470decc6SDave Kleikamp journal->j_free--; 780470decc6SDave Kleikamp if (journal->j_head == journal->j_last) 781470decc6SDave Kleikamp journal->j_head = journal->j_first; 782a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 783f7f4bccbSMingming Cao return jbd2_journal_bmap(journal, blocknr, retp); 784470decc6SDave Kleikamp } 785470decc6SDave Kleikamp 786470decc6SDave Kleikamp /* 787470decc6SDave Kleikamp * Conversion of logical to physical block numbers for the journal 788470decc6SDave Kleikamp * 789470decc6SDave Kleikamp * On external journals the journal blocks are identity-mapped, so 790470decc6SDave Kleikamp * this is a no-op. If needed, we can use j_blk_offset - everything is 791470decc6SDave Kleikamp * ready. 792470decc6SDave Kleikamp */ 793f7f4bccbSMingming Cao int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, 79418eba7aaSMingming Cao unsigned long long *retp) 795470decc6SDave Kleikamp { 796470decc6SDave Kleikamp int err = 0; 79718eba7aaSMingming Cao unsigned long long ret; 798470decc6SDave Kleikamp 799470decc6SDave Kleikamp if (journal->j_inode) { 800470decc6SDave Kleikamp ret = bmap(journal->j_inode, blocknr); 801470decc6SDave Kleikamp if (ret) 802470decc6SDave Kleikamp *retp = ret; 803470decc6SDave Kleikamp else { 804470decc6SDave Kleikamp printk(KERN_ALERT "%s: journal block not found " 805470decc6SDave Kleikamp "at offset %lu on %s\n", 80605496769STheodore Ts'o __func__, blocknr, journal->j_devname); 807470decc6SDave Kleikamp err = -EIO; 808470decc6SDave Kleikamp __journal_abort_soft(journal, err); 809470decc6SDave Kleikamp } 810470decc6SDave Kleikamp } else { 811470decc6SDave Kleikamp *retp = blocknr; /* +journal->j_blk_offset */ 812470decc6SDave Kleikamp } 813470decc6SDave Kleikamp return err; 814470decc6SDave Kleikamp } 815470decc6SDave Kleikamp 816470decc6SDave Kleikamp /* 817470decc6SDave Kleikamp * We play buffer_head aliasing tricks to write data/metadata blocks to 818470decc6SDave Kleikamp * the journal without copying their contents, but for journal 819470decc6SDave Kleikamp * descriptor blocks we do need to generate bona fide buffers. 820470decc6SDave Kleikamp * 821f7f4bccbSMingming Cao * After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying 822470decc6SDave Kleikamp * the buffer's contents they really should run flush_dcache_page(bh->b_page). 823470decc6SDave Kleikamp * But we don't bother doing that, so there will be coherency problems with 824470decc6SDave Kleikamp * mmaps of blockdevs which hold live JBD-controlled filesystems. 825470decc6SDave Kleikamp */ 82632ab6715SJan Kara struct buffer_head * 82732ab6715SJan Kara jbd2_journal_get_descriptor_buffer(transaction_t *transaction, int type) 828470decc6SDave Kleikamp { 82932ab6715SJan Kara journal_t *journal = transaction->t_journal; 830470decc6SDave Kleikamp struct buffer_head *bh; 83118eba7aaSMingming Cao unsigned long long blocknr; 83232ab6715SJan Kara journal_header_t *header; 833470decc6SDave Kleikamp int err; 834470decc6SDave Kleikamp 835f7f4bccbSMingming Cao err = jbd2_journal_next_log_block(journal, &blocknr); 836470decc6SDave Kleikamp 837470decc6SDave Kleikamp if (err) 838470decc6SDave Kleikamp return NULL; 839470decc6SDave Kleikamp 840470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 8414b905671SJan Kara if (!bh) 8424b905671SJan Kara return NULL; 843470decc6SDave Kleikamp lock_buffer(bh); 844470decc6SDave Kleikamp memset(bh->b_data, 0, journal->j_blocksize); 84532ab6715SJan Kara header = (journal_header_t *)bh->b_data; 84632ab6715SJan Kara header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); 84732ab6715SJan Kara header->h_blocktype = cpu_to_be32(type); 84832ab6715SJan Kara header->h_sequence = cpu_to_be32(transaction->t_tid); 849470decc6SDave Kleikamp set_buffer_uptodate(bh); 850470decc6SDave Kleikamp unlock_buffer(bh); 851470decc6SDave Kleikamp BUFFER_TRACE(bh, "return this buffer"); 852e5a120aeSJan Kara return bh; 853470decc6SDave Kleikamp } 854470decc6SDave Kleikamp 8551101cd4dSJan Kara void jbd2_descriptor_block_csum_set(journal_t *j, struct buffer_head *bh) 8561101cd4dSJan Kara { 8571101cd4dSJan Kara struct jbd2_journal_block_tail *tail; 8581101cd4dSJan Kara __u32 csum; 8591101cd4dSJan Kara 8601101cd4dSJan Kara if (!jbd2_journal_has_csum_v2or3(j)) 8611101cd4dSJan Kara return; 8621101cd4dSJan Kara 8631101cd4dSJan Kara tail = (struct jbd2_journal_block_tail *)(bh->b_data + j->j_blocksize - 8641101cd4dSJan Kara sizeof(struct jbd2_journal_block_tail)); 8651101cd4dSJan Kara tail->t_checksum = 0; 8661101cd4dSJan Kara csum = jbd2_chksum(j, j->j_csum_seed, bh->b_data, j->j_blocksize); 8671101cd4dSJan Kara tail->t_checksum = cpu_to_be32(csum); 8681101cd4dSJan Kara } 8691101cd4dSJan Kara 87079feb521SJan Kara /* 87179feb521SJan Kara * Return tid of the oldest transaction in the journal and block in the journal 87279feb521SJan Kara * where the transaction starts. 87379feb521SJan Kara * 87479feb521SJan Kara * If the journal is now empty, return which will be the next transaction ID 87579feb521SJan Kara * we will write and where will that transaction start. 87679feb521SJan Kara * 87779feb521SJan Kara * The return value is 0 if journal tail cannot be pushed any further, 1 if 87879feb521SJan Kara * it can. 87979feb521SJan Kara */ 88079feb521SJan Kara int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, 88179feb521SJan Kara unsigned long *block) 88279feb521SJan Kara { 88379feb521SJan Kara transaction_t *transaction; 88479feb521SJan Kara int ret; 88579feb521SJan Kara 88679feb521SJan Kara read_lock(&journal->j_state_lock); 88779feb521SJan Kara spin_lock(&journal->j_list_lock); 88879feb521SJan Kara transaction = journal->j_checkpoint_transactions; 88979feb521SJan Kara if (transaction) { 89079feb521SJan Kara *tid = transaction->t_tid; 89179feb521SJan Kara *block = transaction->t_log_start; 89279feb521SJan Kara } else if ((transaction = journal->j_committing_transaction) != NULL) { 89379feb521SJan Kara *tid = transaction->t_tid; 89479feb521SJan Kara *block = transaction->t_log_start; 89579feb521SJan Kara } else if ((transaction = journal->j_running_transaction) != NULL) { 89679feb521SJan Kara *tid = transaction->t_tid; 89779feb521SJan Kara *block = journal->j_head; 89879feb521SJan Kara } else { 89979feb521SJan Kara *tid = journal->j_transaction_sequence; 90079feb521SJan Kara *block = journal->j_head; 90179feb521SJan Kara } 90279feb521SJan Kara ret = tid_gt(*tid, journal->j_tail_sequence); 90379feb521SJan Kara spin_unlock(&journal->j_list_lock); 90479feb521SJan Kara read_unlock(&journal->j_state_lock); 90579feb521SJan Kara 90679feb521SJan Kara return ret; 90779feb521SJan Kara } 90879feb521SJan Kara 90979feb521SJan Kara /* 91079feb521SJan Kara * Update information in journal structure and in on disk journal superblock 91179feb521SJan Kara * about log tail. This function does not check whether information passed in 91279feb521SJan Kara * really pushes log tail further. It's responsibility of the caller to make 91379feb521SJan Kara * sure provided log tail information is valid (e.g. by holding 91479feb521SJan Kara * j_checkpoint_mutex all the time between computing log tail and calling this 91579feb521SJan Kara * function as is the case with jbd2_cleanup_journal_tail()). 91679feb521SJan Kara * 91779feb521SJan Kara * Requires j_checkpoint_mutex 91879feb521SJan Kara */ 9196f6a6fdaSJoseph Qi int __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 92079feb521SJan Kara { 92179feb521SJan Kara unsigned long freed; 9226f6a6fdaSJoseph Qi int ret; 92379feb521SJan Kara 92479feb521SJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 92579feb521SJan Kara 92679feb521SJan Kara /* 92779feb521SJan Kara * We cannot afford for write to remain in drive's caches since as 92879feb521SJan Kara * soon as we update j_tail, next transaction can start reusing journal 92979feb521SJan Kara * space and if we lose sb update during power failure we'd replay 93079feb521SJan Kara * old transaction with possibly newly overwritten data. 93179feb521SJan Kara */ 93217f423b5SJan Kara ret = jbd2_journal_update_sb_log_tail(journal, tid, block, 93317f423b5SJan Kara REQ_SYNC | REQ_FUA); 9346f6a6fdaSJoseph Qi if (ret) 9356f6a6fdaSJoseph Qi goto out; 9366f6a6fdaSJoseph Qi 93779feb521SJan Kara write_lock(&journal->j_state_lock); 93879feb521SJan Kara freed = block - journal->j_tail; 93979feb521SJan Kara if (block < journal->j_tail) 94079feb521SJan Kara freed += journal->j_last - journal->j_first; 94179feb521SJan Kara 94279feb521SJan Kara trace_jbd2_update_log_tail(journal, tid, block, freed); 94379feb521SJan Kara jbd_debug(1, 9447821ce41SGaowei Pu "Cleaning journal tail from %u to %u (offset %lu), " 94579feb521SJan Kara "freeing %lu\n", 94679feb521SJan Kara journal->j_tail_sequence, tid, block, freed); 94779feb521SJan Kara 94879feb521SJan Kara journal->j_free += freed; 94979feb521SJan Kara journal->j_tail_sequence = tid; 95079feb521SJan Kara journal->j_tail = block; 95179feb521SJan Kara write_unlock(&journal->j_state_lock); 9526f6a6fdaSJoseph Qi 9536f6a6fdaSJoseph Qi out: 9546f6a6fdaSJoseph Qi return ret; 95579feb521SJan Kara } 95679feb521SJan Kara 9573339578fSJan Kara /* 95885e0c4e8STheodore Ts'o * This is a variation of __jbd2_update_log_tail which checks for validity of 9593339578fSJan Kara * provided log tail and locks j_checkpoint_mutex. So it is safe against races 9603339578fSJan Kara * with other threads updating log tail. 9613339578fSJan Kara */ 9623339578fSJan Kara void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 9633339578fSJan Kara { 9646fa7aa50STejun Heo mutex_lock_io(&journal->j_checkpoint_mutex); 9653339578fSJan Kara if (tid_gt(tid, journal->j_tail_sequence)) 9663339578fSJan Kara __jbd2_update_log_tail(journal, tid, block); 9673339578fSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 9683339578fSJan Kara } 9693339578fSJan Kara 9708e85fb3fSJohann Lombardi struct jbd2_stats_proc_session { 9718e85fb3fSJohann Lombardi journal_t *journal; 9728e85fb3fSJohann Lombardi struct transaction_stats_s *stats; 9738e85fb3fSJohann Lombardi int start; 9748e85fb3fSJohann Lombardi int max; 9758e85fb3fSJohann Lombardi }; 9768e85fb3fSJohann Lombardi 9778e85fb3fSJohann Lombardi static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) 9788e85fb3fSJohann Lombardi { 9798e85fb3fSJohann Lombardi return *pos ? NULL : SEQ_START_TOKEN; 9808e85fb3fSJohann Lombardi } 9818e85fb3fSJohann Lombardi 9828e85fb3fSJohann Lombardi static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) 9838e85fb3fSJohann Lombardi { 9848e85fb3fSJohann Lombardi return NULL; 9858e85fb3fSJohann Lombardi } 9868e85fb3fSJohann Lombardi 9878e85fb3fSJohann Lombardi static int jbd2_seq_info_show(struct seq_file *seq, void *v) 9888e85fb3fSJohann Lombardi { 9898e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 9908e85fb3fSJohann Lombardi 9918e85fb3fSJohann Lombardi if (v != SEQ_START_TOKEN) 9928e85fb3fSJohann Lombardi return 0; 9939fff24aaSTheodore Ts'o seq_printf(seq, "%lu transactions (%lu requested), " 9949fff24aaSTheodore Ts'o "each up to %u blocks\n", 9959fff24aaSTheodore Ts'o s->stats->ts_tid, s->stats->ts_requested, 9968e85fb3fSJohann Lombardi s->journal->j_max_transaction_buffers); 9978e85fb3fSJohann Lombardi if (s->stats->ts_tid == 0) 9988e85fb3fSJohann Lombardi return 0; 9998e85fb3fSJohann Lombardi seq_printf(seq, "average: \n %ums waiting for transaction\n", 1000bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); 10019fff24aaSTheodore Ts'o seq_printf(seq, " %ums request delay\n", 10029fff24aaSTheodore Ts'o (s->stats->ts_requested == 0) ? 0 : 10039fff24aaSTheodore Ts'o jiffies_to_msecs(s->stats->run.rs_request_delay / 10049fff24aaSTheodore Ts'o s->stats->ts_requested)); 10058e85fb3fSJohann Lombardi seq_printf(seq, " %ums running transaction\n", 1006bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); 10078e85fb3fSJohann Lombardi seq_printf(seq, " %ums transaction was being locked\n", 1008bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); 10098e85fb3fSJohann Lombardi seq_printf(seq, " %ums flushing data (in ordered mode)\n", 1010bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); 10118e85fb3fSJohann Lombardi seq_printf(seq, " %ums logging transaction\n", 1012bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); 1013c225aa57SSimon Holm Thøgersen seq_printf(seq, " %lluus average transaction commit time\n", 1014c225aa57SSimon Holm Thøgersen div_u64(s->journal->j_average_commit_time, 1000)); 10158e85fb3fSJohann Lombardi seq_printf(seq, " %lu handles per transaction\n", 1016bf699327STheodore Ts'o s->stats->run.rs_handle_count / s->stats->ts_tid); 10178e85fb3fSJohann Lombardi seq_printf(seq, " %lu blocks per transaction\n", 1018bf699327STheodore Ts'o s->stats->run.rs_blocks / s->stats->ts_tid); 10198e85fb3fSJohann Lombardi seq_printf(seq, " %lu logged blocks per transaction\n", 1020bf699327STheodore Ts'o s->stats->run.rs_blocks_logged / s->stats->ts_tid); 10218e85fb3fSJohann Lombardi return 0; 10228e85fb3fSJohann Lombardi } 10238e85fb3fSJohann Lombardi 10248e85fb3fSJohann Lombardi static void jbd2_seq_info_stop(struct seq_file *seq, void *v) 10258e85fb3fSJohann Lombardi { 10268e85fb3fSJohann Lombardi } 10278e85fb3fSJohann Lombardi 102888e9d34cSJames Morris static const struct seq_operations jbd2_seq_info_ops = { 10298e85fb3fSJohann Lombardi .start = jbd2_seq_info_start, 10308e85fb3fSJohann Lombardi .next = jbd2_seq_info_next, 10318e85fb3fSJohann Lombardi .stop = jbd2_seq_info_stop, 10328e85fb3fSJohann Lombardi .show = jbd2_seq_info_show, 10338e85fb3fSJohann Lombardi }; 10348e85fb3fSJohann Lombardi 10358e85fb3fSJohann Lombardi static int jbd2_seq_info_open(struct inode *inode, struct file *file) 10368e85fb3fSJohann Lombardi { 1037d9dda78bSAl Viro journal_t *journal = PDE_DATA(inode); 10388e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 10398e85fb3fSJohann Lombardi int rc, size; 10408e85fb3fSJohann Lombardi 10418e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 10428e85fb3fSJohann Lombardi if (s == NULL) 10438e85fb3fSJohann Lombardi return -ENOMEM; 10448e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s); 10458e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 10468e85fb3fSJohann Lombardi if (s->stats == NULL) { 10478e85fb3fSJohann Lombardi kfree(s); 10488e85fb3fSJohann Lombardi return -ENOMEM; 10498e85fb3fSJohann Lombardi } 10508e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 10518e85fb3fSJohann Lombardi memcpy(s->stats, &journal->j_stats, size); 10528e85fb3fSJohann Lombardi s->journal = journal; 10538e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 10548e85fb3fSJohann Lombardi 10558e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_info_ops); 10568e85fb3fSJohann Lombardi if (rc == 0) { 10578e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 10588e85fb3fSJohann Lombardi m->private = s; 10598e85fb3fSJohann Lombardi } else { 10608e85fb3fSJohann Lombardi kfree(s->stats); 10618e85fb3fSJohann Lombardi kfree(s); 10628e85fb3fSJohann Lombardi } 10638e85fb3fSJohann Lombardi return rc; 10648e85fb3fSJohann Lombardi 10658e85fb3fSJohann Lombardi } 10668e85fb3fSJohann Lombardi 10678e85fb3fSJohann Lombardi static int jbd2_seq_info_release(struct inode *inode, struct file *file) 10688e85fb3fSJohann Lombardi { 10698e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 10708e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 10718e85fb3fSJohann Lombardi kfree(s->stats); 10728e85fb3fSJohann Lombardi kfree(s); 10738e85fb3fSJohann Lombardi return seq_release(inode, file); 10748e85fb3fSJohann Lombardi } 10758e85fb3fSJohann Lombardi 1076828c0950SAlexey Dobriyan static const struct file_operations jbd2_seq_info_fops = { 10778e85fb3fSJohann Lombardi .owner = THIS_MODULE, 10788e85fb3fSJohann Lombardi .open = jbd2_seq_info_open, 10798e85fb3fSJohann Lombardi .read = seq_read, 10808e85fb3fSJohann Lombardi .llseek = seq_lseek, 10818e85fb3fSJohann Lombardi .release = jbd2_seq_info_release, 10828e85fb3fSJohann Lombardi }; 10838e85fb3fSJohann Lombardi 10848e85fb3fSJohann Lombardi static struct proc_dir_entry *proc_jbd2_stats; 10858e85fb3fSJohann Lombardi 10868e85fb3fSJohann Lombardi static void jbd2_stats_proc_init(journal_t *journal) 10878e85fb3fSJohann Lombardi { 108805496769STheodore Ts'o journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); 10898e85fb3fSJohann Lombardi if (journal->j_proc_entry) { 109079da3664SDenis V. Lunev proc_create_data("info", S_IRUGO, journal->j_proc_entry, 109179da3664SDenis V. Lunev &jbd2_seq_info_fops, journal); 10928e85fb3fSJohann Lombardi } 10938e85fb3fSJohann Lombardi } 10948e85fb3fSJohann Lombardi 10958e85fb3fSJohann Lombardi static void jbd2_stats_proc_exit(journal_t *journal) 10968e85fb3fSJohann Lombardi { 10978e85fb3fSJohann Lombardi remove_proc_entry("info", journal->j_proc_entry); 109805496769STheodore Ts'o remove_proc_entry(journal->j_devname, proc_jbd2_stats); 10998e85fb3fSJohann Lombardi } 11008e85fb3fSJohann Lombardi 1101470decc6SDave Kleikamp /* 1102470decc6SDave Kleikamp * Management for journal control blocks: functions to create and 1103470decc6SDave Kleikamp * destroy journal_t structures, and to initialise and read existing 1104470decc6SDave Kleikamp * journal blocks from disk. */ 1105470decc6SDave Kleikamp 1106470decc6SDave Kleikamp /* First: create and setup a journal_t object in memory. We initialise 1107470decc6SDave Kleikamp * very few fields yet: that has to wait until we have created the 1108470decc6SDave Kleikamp * journal structures from from scratch, or loaded them from disk. */ 1109470decc6SDave Kleikamp 1110f0c9fd54SGeliang Tang static journal_t *journal_init_common(struct block_device *bdev, 1111f0c9fd54SGeliang Tang struct block_device *fs_dev, 1112f0c9fd54SGeliang Tang unsigned long long start, int len, int blocksize) 1113470decc6SDave Kleikamp { 1114ab714affSJan Kara static struct lock_class_key jbd2_trans_commit_key; 1115470decc6SDave Kleikamp journal_t *journal; 1116470decc6SDave Kleikamp int err; 1117f0c9fd54SGeliang Tang struct buffer_head *bh; 1118f0c9fd54SGeliang Tang int n; 1119470decc6SDave Kleikamp 11203ebfdf88SAndrew Morton journal = kzalloc(sizeof(*journal), GFP_KERNEL); 1121470decc6SDave Kleikamp if (!journal) 1122b7271b0aSTheodore Ts'o return NULL; 1123470decc6SDave Kleikamp 1124470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_transaction_locked); 1125470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_done_commit); 1126470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_commit); 1127470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_updates); 11288f7d89f3SJan Kara init_waitqueue_head(&journal->j_wait_reserved); 1129470decc6SDave Kleikamp mutex_init(&journal->j_barrier); 1130470decc6SDave Kleikamp mutex_init(&journal->j_checkpoint_mutex); 1131470decc6SDave Kleikamp spin_lock_init(&journal->j_revoke_lock); 1132470decc6SDave Kleikamp spin_lock_init(&journal->j_list_lock); 1133a931da6aSTheodore Ts'o rwlock_init(&journal->j_state_lock); 1134470decc6SDave Kleikamp 1135cd02ff0bSMingming Cao journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); 113630773840STheodore Ts'o journal->j_min_batch_time = 0; 113730773840STheodore Ts'o journal->j_max_batch_time = 15000; /* 15ms */ 11388f7d89f3SJan Kara atomic_set(&journal->j_reserved_credits, 0); 1139470decc6SDave Kleikamp 1140470decc6SDave Kleikamp /* The journal is marked for error until we succeed with recovery! */ 1141f7f4bccbSMingming Cao journal->j_flags = JBD2_ABORT; 1142470decc6SDave Kleikamp 1143470decc6SDave Kleikamp /* Set up a default-sized revoke table for the new mount. */ 1144f7f4bccbSMingming Cao err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); 1145cd9cb405SEric Biggers if (err) 1146cd9cb405SEric Biggers goto err_cleanup; 11478e85fb3fSJohann Lombardi 1148bf699327STheodore Ts'o spin_lock_init(&journal->j_history_lock); 11498e85fb3fSJohann Lombardi 1150ab714affSJan Kara lockdep_init_map(&journal->j_trans_commit_map, "jbd2_handle", 1151ab714affSJan Kara &jbd2_trans_commit_key, 0); 1152ab714affSJan Kara 1153f0c9fd54SGeliang Tang /* journal descriptor can store up to n blocks -bzzz */ 1154f0c9fd54SGeliang Tang journal->j_blocksize = blocksize; 1155f0c9fd54SGeliang Tang journal->j_dev = bdev; 1156f0c9fd54SGeliang Tang journal->j_fs_dev = fs_dev; 1157f0c9fd54SGeliang Tang journal->j_blk_offset = start; 1158f0c9fd54SGeliang Tang journal->j_maxlen = len; 1159f0c9fd54SGeliang Tang n = journal->j_blocksize / sizeof(journal_block_tag_t); 1160f0c9fd54SGeliang Tang journal->j_wbufsize = n; 1161f0c9fd54SGeliang Tang journal->j_wbuf = kmalloc_array(n, sizeof(struct buffer_head *), 1162f0c9fd54SGeliang Tang GFP_KERNEL); 1163cd9cb405SEric Biggers if (!journal->j_wbuf) 1164cd9cb405SEric Biggers goto err_cleanup; 1165f0c9fd54SGeliang Tang 1166f0c9fd54SGeliang Tang bh = getblk_unmovable(journal->j_dev, start, journal->j_blocksize); 1167f0c9fd54SGeliang Tang if (!bh) { 1168f0c9fd54SGeliang Tang pr_err("%s: Cannot get buffer for journal superblock\n", 1169f0c9fd54SGeliang Tang __func__); 1170cd9cb405SEric Biggers goto err_cleanup; 1171f0c9fd54SGeliang Tang } 1172f0c9fd54SGeliang Tang journal->j_sb_buffer = bh; 1173f0c9fd54SGeliang Tang journal->j_superblock = (journal_superblock_t *)bh->b_data; 1174f0c9fd54SGeliang Tang 1175470decc6SDave Kleikamp return journal; 1176cd9cb405SEric Biggers 1177cd9cb405SEric Biggers err_cleanup: 1178cd9cb405SEric Biggers kfree(journal->j_wbuf); 1179cd9cb405SEric Biggers jbd2_journal_destroy_revoke(journal); 1180cd9cb405SEric Biggers kfree(journal); 1181cd9cb405SEric Biggers return NULL; 1182470decc6SDave Kleikamp } 1183470decc6SDave Kleikamp 1184f7f4bccbSMingming Cao /* jbd2_journal_init_dev and jbd2_journal_init_inode: 1185470decc6SDave Kleikamp * 1186470decc6SDave Kleikamp * Create a journal structure assigned some fixed set of disk blocks to 1187470decc6SDave Kleikamp * the journal. We don't actually touch those disk blocks yet, but we 1188470decc6SDave Kleikamp * need to set up all of the mapping information to tell the journaling 1189470decc6SDave Kleikamp * system where the journal blocks are. 1190470decc6SDave Kleikamp * 1191470decc6SDave Kleikamp */ 1192470decc6SDave Kleikamp 1193470decc6SDave Kleikamp /** 11945648ba5bSRandy Dunlap * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure 1195470decc6SDave Kleikamp * @bdev: Block device on which to create the journal 1196470decc6SDave Kleikamp * @fs_dev: Device which hold journalled filesystem for this journal. 1197470decc6SDave Kleikamp * @start: Block nr Start of journal. 1198470decc6SDave Kleikamp * @len: Length of the journal in blocks. 1199470decc6SDave Kleikamp * @blocksize: blocksize of journalling device 12005648ba5bSRandy Dunlap * 12015648ba5bSRandy Dunlap * Returns: a newly created journal_t * 1202470decc6SDave Kleikamp * 1203f7f4bccbSMingming Cao * jbd2_journal_init_dev creates a journal which maps a fixed contiguous 1204470decc6SDave Kleikamp * range of blocks on an arbitrary block device. 1205470decc6SDave Kleikamp * 1206470decc6SDave Kleikamp */ 1207f7f4bccbSMingming Cao journal_t *jbd2_journal_init_dev(struct block_device *bdev, 1208470decc6SDave Kleikamp struct block_device *fs_dev, 120918eba7aaSMingming Cao unsigned long long start, int len, int blocksize) 1210470decc6SDave Kleikamp { 1211f0c9fd54SGeliang Tang journal_t *journal; 1212470decc6SDave Kleikamp 1213f0c9fd54SGeliang Tang journal = journal_init_common(bdev, fs_dev, start, len, blocksize); 1214470decc6SDave Kleikamp if (!journal) 1215470decc6SDave Kleikamp return NULL; 1216470decc6SDave Kleikamp 12170587aa3dSyangsheng bdevname(journal->j_dev, journal->j_devname); 121881ae394bSRasmus Villemoes strreplace(journal->j_devname, '/', '!'); 12194b905671SJan Kara jbd2_stats_proc_init(journal); 12204b905671SJan Kara 1221470decc6SDave Kleikamp return journal; 1222470decc6SDave Kleikamp } 1223470decc6SDave Kleikamp 1224470decc6SDave Kleikamp /** 1225f7f4bccbSMingming Cao * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. 1226470decc6SDave Kleikamp * @inode: An inode to create the journal in 1227470decc6SDave Kleikamp * 1228f7f4bccbSMingming Cao * jbd2_journal_init_inode creates a journal which maps an on-disk inode as 1229470decc6SDave Kleikamp * the journal. The inode must exist already, must support bmap() and 1230470decc6SDave Kleikamp * must have all data blocks preallocated. 1231470decc6SDave Kleikamp */ 1232f7f4bccbSMingming Cao journal_t *jbd2_journal_init_inode(struct inode *inode) 1233470decc6SDave Kleikamp { 1234f0c9fd54SGeliang Tang journal_t *journal; 123505496769STheodore Ts'o char *p; 123618eba7aaSMingming Cao unsigned long long blocknr; 1237470decc6SDave Kleikamp 1238f0c9fd54SGeliang Tang blocknr = bmap(inode, 0); 1239f0c9fd54SGeliang Tang if (!blocknr) { 1240f0c9fd54SGeliang Tang pr_err("%s: Cannot locate journal superblock\n", 1241f0c9fd54SGeliang Tang __func__); 1242f0c9fd54SGeliang Tang return NULL; 1243f0c9fd54SGeliang Tang } 1244f0c9fd54SGeliang Tang 1245f0c9fd54SGeliang Tang jbd_debug(1, "JBD2: inode %s/%ld, size %lld, bits %d, blksize %ld\n", 1246f0c9fd54SGeliang Tang inode->i_sb->s_id, inode->i_ino, (long long) inode->i_size, 1247f0c9fd54SGeliang Tang inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); 1248f0c9fd54SGeliang Tang 1249f0c9fd54SGeliang Tang journal = journal_init_common(inode->i_sb->s_bdev, inode->i_sb->s_bdev, 1250f0c9fd54SGeliang Tang blocknr, inode->i_size >> inode->i_sb->s_blocksize_bits, 1251f0c9fd54SGeliang Tang inode->i_sb->s_blocksize); 1252470decc6SDave Kleikamp if (!journal) 1253470decc6SDave Kleikamp return NULL; 1254470decc6SDave Kleikamp 1255470decc6SDave Kleikamp journal->j_inode = inode; 125605496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 125781ae394bSRasmus Villemoes p = strreplace(journal->j_devname, '/', '!'); 125890576c0bSTheodore Ts'o sprintf(p, "-%lu", journal->j_inode->i_ino); 12598e85fb3fSJohann Lombardi jbd2_stats_proc_init(journal); 1260470decc6SDave Kleikamp 1261470decc6SDave Kleikamp return journal; 1262470decc6SDave Kleikamp } 1263470decc6SDave Kleikamp 1264470decc6SDave Kleikamp /* 1265470decc6SDave Kleikamp * If the journal init or create aborts, we need to mark the journal 1266470decc6SDave Kleikamp * superblock as being NULL to prevent the journal destroy from writing 1267470decc6SDave Kleikamp * back a bogus superblock. 1268470decc6SDave Kleikamp */ 1269470decc6SDave Kleikamp static void journal_fail_superblock (journal_t *journal) 1270470decc6SDave Kleikamp { 1271470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1272470decc6SDave Kleikamp brelse(bh); 1273470decc6SDave Kleikamp journal->j_sb_buffer = NULL; 1274470decc6SDave Kleikamp } 1275470decc6SDave Kleikamp 1276470decc6SDave Kleikamp /* 1277470decc6SDave Kleikamp * Given a journal_t structure, initialise the various fields for 1278470decc6SDave Kleikamp * startup of a new journaling session. We use this both when creating 1279470decc6SDave Kleikamp * a journal, and after recovering an old journal to reset it for 1280470decc6SDave Kleikamp * subsequent use. 1281470decc6SDave Kleikamp */ 1282470decc6SDave Kleikamp 1283470decc6SDave Kleikamp static int journal_reset(journal_t *journal) 1284470decc6SDave Kleikamp { 1285470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 128618eba7aaSMingming Cao unsigned long long first, last; 1287470decc6SDave Kleikamp 1288470decc6SDave Kleikamp first = be32_to_cpu(sb->s_first); 1289470decc6SDave Kleikamp last = be32_to_cpu(sb->s_maxlen); 1290f6f50e28SJan Kara if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { 1291f2a44523SEryu Guan printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu).\n", 1292f6f50e28SJan Kara first, last); 1293f6f50e28SJan Kara journal_fail_superblock(journal); 1294f6f50e28SJan Kara return -EINVAL; 1295f6f50e28SJan Kara } 1296470decc6SDave Kleikamp 1297470decc6SDave Kleikamp journal->j_first = first; 1298470decc6SDave Kleikamp journal->j_last = last; 1299470decc6SDave Kleikamp 1300470decc6SDave Kleikamp journal->j_head = first; 1301470decc6SDave Kleikamp journal->j_tail = first; 1302470decc6SDave Kleikamp journal->j_free = last - first; 1303470decc6SDave Kleikamp 1304470decc6SDave Kleikamp journal->j_tail_sequence = journal->j_transaction_sequence; 1305470decc6SDave Kleikamp journal->j_commit_sequence = journal->j_transaction_sequence - 1; 1306470decc6SDave Kleikamp journal->j_commit_request = journal->j_commit_sequence; 1307470decc6SDave Kleikamp 1308470decc6SDave Kleikamp journal->j_max_transaction_buffers = journal->j_maxlen / 4; 1309470decc6SDave Kleikamp 1310470decc6SDave Kleikamp /* 1311470decc6SDave Kleikamp * As a special case, if the on-disk copy is already marked as needing 131224bcc89cSJan Kara * no recovery (s_start == 0), then we can safely defer the superblock 131324bcc89cSJan Kara * update until the next commit by setting JBD2_FLUSHED. This avoids 1314470decc6SDave Kleikamp * attempting a write to a potential-readonly device. 1315470decc6SDave Kleikamp */ 131624bcc89cSJan Kara if (sb->s_start == 0) { 1317f2a44523SEryu Guan jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " 13187821ce41SGaowei Pu "(start %ld, seq %u, errno %d)\n", 1319470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, 1320470decc6SDave Kleikamp journal->j_errno); 132124bcc89cSJan Kara journal->j_flags |= JBD2_FLUSHED; 132224bcc89cSJan Kara } else { 1323a78bb11dSJan Kara /* Lock here to make assertions happy... */ 13246fa7aa50STejun Heo mutex_lock_io(&journal->j_checkpoint_mutex); 132579feb521SJan Kara /* 132670fd7614SChristoph Hellwig * Update log tail information. We use REQ_FUA since new 132779feb521SJan Kara * transaction will start reusing journal space and so we 132879feb521SJan Kara * must make sure information about current log tail is on 132979feb521SJan Kara * disk before that. 133079feb521SJan Kara */ 133179feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, 133279feb521SJan Kara journal->j_tail_sequence, 133379feb521SJan Kara journal->j_tail, 133417f423b5SJan Kara REQ_SYNC | REQ_FUA); 1335a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 133624bcc89cSJan Kara } 133724bcc89cSJan Kara return jbd2_journal_start_thread(journal); 1338470decc6SDave Kleikamp } 1339470decc6SDave Kleikamp 1340538bcaa6STheodore Ts'o /* 1341538bcaa6STheodore Ts'o * This function expects that the caller will have locked the journal 1342538bcaa6STheodore Ts'o * buffer head, and will return with it unlocked 1343538bcaa6STheodore Ts'o */ 13442a222ca9SMike Christie static int jbd2_write_superblock(journal_t *journal, int write_flags) 134524bcc89cSJan Kara { 134624bcc89cSJan Kara struct buffer_head *bh = journal->j_sb_buffer; 1347fe52d17cSTheodore Ts'o journal_superblock_t *sb = journal->j_superblock; 134879feb521SJan Kara int ret; 134924bcc89cSJan Kara 1350742b06b5SJiufei Xue /* Buffer got discarded which means block device got invalidated */ 1351742b06b5SJiufei Xue if (!buffer_mapped(bh)) 1352742b06b5SJiufei Xue return -EIO; 1353742b06b5SJiufei Xue 13542a222ca9SMike Christie trace_jbd2_write_superblock(journal, write_flags); 135579feb521SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 135628a8f0d3SMike Christie write_flags &= ~(REQ_FUA | REQ_PREFLUSH); 1357914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1358914258bfSTheodore Ts'o /* 1359914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the journal 1360914258bfSTheodore Ts'o * superblock failed. This could happen because the 1361914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 1362914258bfSTheodore Ts'o * be a transient write error and maybe the block will 1363914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 1364914258bfSTheodore Ts'o * write and hope for the best. 1365914258bfSTheodore Ts'o */ 1366914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: previous I/O error detected " 1367914258bfSTheodore Ts'o "for journal superblock update for %s.\n", 1368914258bfSTheodore Ts'o journal->j_devname); 1369914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1370914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1371914258bfSTheodore Ts'o } 1372a58ca992STheodore Ts'o if (jbd2_journal_has_csum_v2or3(journal)) 1373a58ca992STheodore Ts'o sb->s_checksum = jbd2_superblock_csum(journal, sb); 137479feb521SJan Kara get_bh(bh); 137579feb521SJan Kara bh->b_end_io = end_buffer_write_sync; 13762a222ca9SMike Christie ret = submit_bh(REQ_OP_WRITE, write_flags, bh); 137779feb521SJan Kara wait_on_buffer(bh); 1378914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1379914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1380914258bfSTheodore Ts'o set_buffer_uptodate(bh); 138179feb521SJan Kara ret = -EIO; 138279feb521SJan Kara } 138379feb521SJan Kara if (ret) { 138479feb521SJan Kara printk(KERN_ERR "JBD2: Error %d detected when updating " 138579feb521SJan Kara "journal superblock for %s.\n", ret, 138679feb521SJan Kara journal->j_devname); 13876f6a6fdaSJoseph Qi jbd2_journal_abort(journal, ret); 1388914258bfSTheodore Ts'o } 13896f6a6fdaSJoseph Qi 13906f6a6fdaSJoseph Qi return ret; 139124bcc89cSJan Kara } 1392470decc6SDave Kleikamp 139324bcc89cSJan Kara /** 139424bcc89cSJan Kara * jbd2_journal_update_sb_log_tail() - Update log tail in journal sb on disk. 139524bcc89cSJan Kara * @journal: The journal to update. 139679feb521SJan Kara * @tail_tid: TID of the new transaction at the tail of the log 139779feb521SJan Kara * @tail_block: The first block of the transaction at the tail of the log 139879feb521SJan Kara * @write_op: With which operation should we write the journal sb 139924bcc89cSJan Kara * 140024bcc89cSJan Kara * Update a journal's superblock information about log tail and write it to 140124bcc89cSJan Kara * disk, waiting for the IO to complete. 140224bcc89cSJan Kara */ 14036f6a6fdaSJoseph Qi int jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid, 140479feb521SJan Kara unsigned long tail_block, int write_op) 140524bcc89cSJan Kara { 140624bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 14076f6a6fdaSJoseph Qi int ret; 14082201c590SSeiji Aguchi 140985e0c4e8STheodore Ts'o if (is_journal_aborted(journal)) 141085e0c4e8STheodore Ts'o return -EIO; 141185e0c4e8STheodore Ts'o 1412a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 141379feb521SJan Kara jbd_debug(1, "JBD2: updating superblock (start %lu, seq %u)\n", 141479feb521SJan Kara tail_block, tail_tid); 1415470decc6SDave Kleikamp 1416538bcaa6STheodore Ts'o lock_buffer(journal->j_sb_buffer); 141779feb521SJan Kara sb->s_sequence = cpu_to_be32(tail_tid); 141879feb521SJan Kara sb->s_start = cpu_to_be32(tail_block); 141924bcc89cSJan Kara 14206f6a6fdaSJoseph Qi ret = jbd2_write_superblock(journal, write_op); 14216f6a6fdaSJoseph Qi if (ret) 14226f6a6fdaSJoseph Qi goto out; 142324bcc89cSJan Kara 142424bcc89cSJan Kara /* Log is no longer empty */ 1425a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 142624bcc89cSJan Kara WARN_ON(!sb->s_sequence); 1427f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_FLUSHED; 142824bcc89cSJan Kara write_unlock(&journal->j_state_lock); 14296f6a6fdaSJoseph Qi 14306f6a6fdaSJoseph Qi out: 14316f6a6fdaSJoseph Qi return ret; 143224bcc89cSJan Kara } 143324bcc89cSJan Kara 143424bcc89cSJan Kara /** 143524bcc89cSJan Kara * jbd2_mark_journal_empty() - Mark on disk journal as empty. 143624bcc89cSJan Kara * @journal: The journal to update. 1437c0a2ad9bSOGAWA Hirofumi * @write_op: With which operation should we write the journal sb 143824bcc89cSJan Kara * 143924bcc89cSJan Kara * Update a journal's dynamic superblock fields to show that journal is empty. 144024bcc89cSJan Kara * Write updated superblock to disk waiting for IO to complete. 144124bcc89cSJan Kara */ 1442c0a2ad9bSOGAWA Hirofumi static void jbd2_mark_journal_empty(journal_t *journal, int write_op) 144324bcc89cSJan Kara { 144424bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 144524bcc89cSJan Kara 1446a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 1447538bcaa6STheodore Ts'o lock_buffer(journal->j_sb_buffer); 1448538bcaa6STheodore Ts'o if (sb->s_start == 0) { /* Is it already empty? */ 1449538bcaa6STheodore Ts'o unlock_buffer(journal->j_sb_buffer); 1450eeecef0aSEric Sandeen return; 1451eeecef0aSEric Sandeen } 1452538bcaa6STheodore Ts'o 14537821ce41SGaowei Pu jbd_debug(1, "JBD2: Marking journal as empty (seq %u)\n", 145424bcc89cSJan Kara journal->j_tail_sequence); 1455470decc6SDave Kleikamp 1456470decc6SDave Kleikamp sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 145724bcc89cSJan Kara sb->s_start = cpu_to_be32(0); 145824bcc89cSJan Kara 1459c0a2ad9bSOGAWA Hirofumi jbd2_write_superblock(journal, write_op); 146024bcc89cSJan Kara 146124bcc89cSJan Kara /* Log is no longer empty */ 146224bcc89cSJan Kara write_lock(&journal->j_state_lock); 1463f7f4bccbSMingming Cao journal->j_flags |= JBD2_FLUSHED; 1464a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1465470decc6SDave Kleikamp } 1466470decc6SDave Kleikamp 146724bcc89cSJan Kara 146824bcc89cSJan Kara /** 146924bcc89cSJan Kara * jbd2_journal_update_sb_errno() - Update error in the journal. 147024bcc89cSJan Kara * @journal: The journal to update. 147124bcc89cSJan Kara * 147224bcc89cSJan Kara * Update a journal's errno. Write updated superblock to disk waiting for IO 147324bcc89cSJan Kara * to complete. 147424bcc89cSJan Kara */ 1475d796c52eSTheodore Ts'o void jbd2_journal_update_sb_errno(journal_t *journal) 147624bcc89cSJan Kara { 147724bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 1478fb7c0244STheodore Ts'o int errcode; 147924bcc89cSJan Kara 1480538bcaa6STheodore Ts'o lock_buffer(journal->j_sb_buffer); 1481fb7c0244STheodore Ts'o errcode = journal->j_errno; 1482fb7c0244STheodore Ts'o if (errcode == -ESHUTDOWN) 1483fb7c0244STheodore Ts'o errcode = 0; 1484fb7c0244STheodore Ts'o jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", errcode); 1485fb7c0244STheodore Ts'o sb->s_errno = cpu_to_be32(errcode); 1486470decc6SDave Kleikamp 148717f423b5SJan Kara jbd2_write_superblock(journal, REQ_SYNC | REQ_FUA); 1488470decc6SDave Kleikamp } 1489d796c52eSTheodore Ts'o EXPORT_SYMBOL(jbd2_journal_update_sb_errno); 1490470decc6SDave Kleikamp 1491470decc6SDave Kleikamp /* 1492470decc6SDave Kleikamp * Read the superblock for a given journal, performing initial 1493470decc6SDave Kleikamp * validation of the format. 1494470decc6SDave Kleikamp */ 1495470decc6SDave Kleikamp static int journal_get_superblock(journal_t *journal) 1496470decc6SDave Kleikamp { 1497470decc6SDave Kleikamp struct buffer_head *bh; 1498470decc6SDave Kleikamp journal_superblock_t *sb; 1499470decc6SDave Kleikamp int err = -EIO; 1500470decc6SDave Kleikamp 1501470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1502470decc6SDave Kleikamp 1503470decc6SDave Kleikamp J_ASSERT(bh != NULL); 1504470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1505dfec8a14SMike Christie ll_rw_block(REQ_OP_READ, 0, 1, &bh); 1506470decc6SDave Kleikamp wait_on_buffer(bh); 1507470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1508470decc6SDave Kleikamp printk(KERN_ERR 1509f2a44523SEryu Guan "JBD2: IO error reading journal superblock\n"); 1510470decc6SDave Kleikamp goto out; 1511470decc6SDave Kleikamp } 1512470decc6SDave Kleikamp } 1513470decc6SDave Kleikamp 151425ed6e8aSDarrick J. Wong if (buffer_verified(bh)) 151525ed6e8aSDarrick J. Wong return 0; 151625ed6e8aSDarrick J. Wong 1517470decc6SDave Kleikamp sb = journal->j_superblock; 1518470decc6SDave Kleikamp 1519470decc6SDave Kleikamp err = -EINVAL; 1520470decc6SDave Kleikamp 1521f7f4bccbSMingming Cao if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || 1522470decc6SDave Kleikamp sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { 1523f2a44523SEryu Guan printk(KERN_WARNING "JBD2: no valid journal superblock found\n"); 1524470decc6SDave Kleikamp goto out; 1525470decc6SDave Kleikamp } 1526470decc6SDave Kleikamp 1527470decc6SDave Kleikamp switch(be32_to_cpu(sb->s_header.h_blocktype)) { 1528f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1529470decc6SDave Kleikamp journal->j_format_version = 1; 1530470decc6SDave Kleikamp break; 1531f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1532470decc6SDave Kleikamp journal->j_format_version = 2; 1533470decc6SDave Kleikamp break; 1534470decc6SDave Kleikamp default: 1535f2a44523SEryu Guan printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n"); 1536470decc6SDave Kleikamp goto out; 1537470decc6SDave Kleikamp } 1538470decc6SDave Kleikamp 1539470decc6SDave Kleikamp if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) 1540470decc6SDave Kleikamp journal->j_maxlen = be32_to_cpu(sb->s_maxlen); 1541470decc6SDave Kleikamp else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { 1542f2a44523SEryu Guan printk(KERN_WARNING "JBD2: journal file too short\n"); 1543470decc6SDave Kleikamp goto out; 1544470decc6SDave Kleikamp } 1545470decc6SDave Kleikamp 15468762202dSEryu Guan if (be32_to_cpu(sb->s_first) == 0 || 15478762202dSEryu Guan be32_to_cpu(sb->s_first) >= journal->j_maxlen) { 15488762202dSEryu Guan printk(KERN_WARNING 15498762202dSEryu Guan "JBD2: Invalid start block of journal: %u\n", 15508762202dSEryu Guan be32_to_cpu(sb->s_first)); 15518762202dSEryu Guan goto out; 15528762202dSEryu Guan } 15538762202dSEryu Guan 155456316a0dSDarrick J. Wong if (jbd2_has_feature_csum2(journal) && 155556316a0dSDarrick J. Wong jbd2_has_feature_csum3(journal)) { 1556db9ee220SDarrick J. Wong /* Can't have checksum v2 and v3 at the same time! */ 1557db9ee220SDarrick J. Wong printk(KERN_ERR "JBD2: Can't enable checksumming v2 and v3 " 1558db9ee220SDarrick J. Wong "at the same time!\n"); 1559db9ee220SDarrick J. Wong goto out; 1560db9ee220SDarrick J. Wong } 1561db9ee220SDarrick J. Wong 15628595798cSDarrick J. Wong if (jbd2_journal_has_csum_v2or3_feature(journal) && 156356316a0dSDarrick J. Wong jbd2_has_feature_checksum(journal)) { 1564feb8c6d3SDarrick J. Wong /* Can't have checksum v1 and v2 on at the same time! */ 1565feb8c6d3SDarrick J. Wong printk(KERN_ERR "JBD2: Can't enable checksumming v1 and v2/3 " 1566feb8c6d3SDarrick J. Wong "at the same time!\n"); 1567feb8c6d3SDarrick J. Wong goto out; 1568feb8c6d3SDarrick J. Wong } 1569feb8c6d3SDarrick J. Wong 157025ed6e8aSDarrick J. Wong if (!jbd2_verify_csum_type(journal, sb)) { 1571a67c848aSDmitry Monakhov printk(KERN_ERR "JBD2: Unknown checksum type\n"); 157225ed6e8aSDarrick J. Wong goto out; 157325ed6e8aSDarrick J. Wong } 157425ed6e8aSDarrick J. Wong 157501b5adceSDarrick J. Wong /* Load the checksum driver */ 15768595798cSDarrick J. Wong if (jbd2_journal_has_csum_v2or3_feature(journal)) { 157701b5adceSDarrick J. Wong journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 157801b5adceSDarrick J. Wong if (IS_ERR(journal->j_chksum_driver)) { 1579a67c848aSDmitry Monakhov printk(KERN_ERR "JBD2: Cannot load crc32c driver.\n"); 158001b5adceSDarrick J. Wong err = PTR_ERR(journal->j_chksum_driver); 158101b5adceSDarrick J. Wong journal->j_chksum_driver = NULL; 158201b5adceSDarrick J. Wong goto out; 158301b5adceSDarrick J. Wong } 158401b5adceSDarrick J. Wong } 158501b5adceSDarrick J. Wong 1586a58ca992STheodore Ts'o if (jbd2_journal_has_csum_v2or3(journal)) { 15874fd5ea43SDarrick J. Wong /* Check superblock checksum */ 1588a58ca992STheodore Ts'o if (sb->s_checksum != jbd2_superblock_csum(journal, sb)) { 1589a67c848aSDmitry Monakhov printk(KERN_ERR "JBD2: journal checksum error\n"); 15906a797d27SDarrick J. Wong err = -EFSBADCRC; 15914fd5ea43SDarrick J. Wong goto out; 15924fd5ea43SDarrick J. Wong } 15934fd5ea43SDarrick J. Wong 15944fd5ea43SDarrick J. Wong /* Precompute checksum seed for all metadata */ 15954fd5ea43SDarrick J. Wong journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid, 15964fd5ea43SDarrick J. Wong sizeof(sb->s_uuid)); 1597a58ca992STheodore Ts'o } 15984fd5ea43SDarrick J. Wong 159925ed6e8aSDarrick J. Wong set_buffer_verified(bh); 160025ed6e8aSDarrick J. Wong 1601470decc6SDave Kleikamp return 0; 1602470decc6SDave Kleikamp 1603470decc6SDave Kleikamp out: 1604470decc6SDave Kleikamp journal_fail_superblock(journal); 1605470decc6SDave Kleikamp return err; 1606470decc6SDave Kleikamp } 1607470decc6SDave Kleikamp 1608470decc6SDave Kleikamp /* 1609470decc6SDave Kleikamp * Load the on-disk journal superblock and read the key fields into the 1610470decc6SDave Kleikamp * journal_t. 1611470decc6SDave Kleikamp */ 1612470decc6SDave Kleikamp 1613470decc6SDave Kleikamp static int load_superblock(journal_t *journal) 1614470decc6SDave Kleikamp { 1615470decc6SDave Kleikamp int err; 1616470decc6SDave Kleikamp journal_superblock_t *sb; 1617470decc6SDave Kleikamp 1618470decc6SDave Kleikamp err = journal_get_superblock(journal); 1619470decc6SDave Kleikamp if (err) 1620470decc6SDave Kleikamp return err; 1621470decc6SDave Kleikamp 1622470decc6SDave Kleikamp sb = journal->j_superblock; 1623470decc6SDave Kleikamp 1624470decc6SDave Kleikamp journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); 1625470decc6SDave Kleikamp journal->j_tail = be32_to_cpu(sb->s_start); 1626470decc6SDave Kleikamp journal->j_first = be32_to_cpu(sb->s_first); 1627470decc6SDave Kleikamp journal->j_last = be32_to_cpu(sb->s_maxlen); 1628470decc6SDave Kleikamp journal->j_errno = be32_to_cpu(sb->s_errno); 1629470decc6SDave Kleikamp 1630470decc6SDave Kleikamp return 0; 1631470decc6SDave Kleikamp } 1632470decc6SDave Kleikamp 1633470decc6SDave Kleikamp 1634470decc6SDave Kleikamp /** 1635f7f4bccbSMingming Cao * int jbd2_journal_load() - Read journal from disk. 1636470decc6SDave Kleikamp * @journal: Journal to act on. 1637470decc6SDave Kleikamp * 1638470decc6SDave Kleikamp * Given a journal_t structure which tells us which disk blocks contain 1639470decc6SDave Kleikamp * a journal, read the journal from disk to initialise the in-memory 1640470decc6SDave Kleikamp * structures. 1641470decc6SDave Kleikamp */ 1642f7f4bccbSMingming Cao int jbd2_journal_load(journal_t *journal) 1643470decc6SDave Kleikamp { 1644470decc6SDave Kleikamp int err; 1645470decc6SDave Kleikamp journal_superblock_t *sb; 1646470decc6SDave Kleikamp 1647470decc6SDave Kleikamp err = load_superblock(journal); 1648470decc6SDave Kleikamp if (err) 1649470decc6SDave Kleikamp return err; 1650470decc6SDave Kleikamp 1651470decc6SDave Kleikamp sb = journal->j_superblock; 1652470decc6SDave Kleikamp /* If this is a V2 superblock, then we have to check the 1653470decc6SDave Kleikamp * features flags on it. */ 1654470decc6SDave Kleikamp 1655470decc6SDave Kleikamp if (journal->j_format_version >= 2) { 1656470decc6SDave Kleikamp if ((sb->s_feature_ro_compat & 1657f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || 1658470decc6SDave Kleikamp (sb->s_feature_incompat & 1659f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { 1660470decc6SDave Kleikamp printk(KERN_WARNING 1661f2a44523SEryu Guan "JBD2: Unrecognised features on journal\n"); 1662470decc6SDave Kleikamp return -EINVAL; 1663470decc6SDave Kleikamp } 1664470decc6SDave Kleikamp } 1665470decc6SDave Kleikamp 1666d2eecb03STheodore Ts'o /* 1667d2eecb03STheodore Ts'o * Create a slab for this blocksize 1668d2eecb03STheodore Ts'o */ 1669d2eecb03STheodore Ts'o err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); 1670d2eecb03STheodore Ts'o if (err) 1671d2eecb03STheodore Ts'o return err; 1672d2eecb03STheodore Ts'o 1673470decc6SDave Kleikamp /* Let the recovery code check whether it needs to recover any 1674470decc6SDave Kleikamp * data from the journal. */ 1675f7f4bccbSMingming Cao if (jbd2_journal_recover(journal)) 1676470decc6SDave Kleikamp goto recovery_error; 1677470decc6SDave Kleikamp 1678e6a47428STheodore Ts'o if (journal->j_failed_commit) { 1679e6a47428STheodore Ts'o printk(KERN_ERR "JBD2: journal transaction %u on %s " 1680e6a47428STheodore Ts'o "is corrupt.\n", journal->j_failed_commit, 1681e6a47428STheodore Ts'o journal->j_devname); 16826a797d27SDarrick J. Wong return -EFSCORRUPTED; 1683e6a47428STheodore Ts'o } 1684e6a47428STheodore Ts'o 1685470decc6SDave Kleikamp /* OK, we've finished with the dynamic journal bits: 1686470decc6SDave Kleikamp * reinitialise the dynamic contents of the superblock in memory 1687470decc6SDave Kleikamp * and reset them on disk. */ 1688470decc6SDave Kleikamp if (journal_reset(journal)) 1689470decc6SDave Kleikamp goto recovery_error; 1690470decc6SDave Kleikamp 1691f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_ABORT; 1692f7f4bccbSMingming Cao journal->j_flags |= JBD2_LOADED; 1693470decc6SDave Kleikamp return 0; 1694470decc6SDave Kleikamp 1695470decc6SDave Kleikamp recovery_error: 1696f2a44523SEryu Guan printk(KERN_WARNING "JBD2: recovery failed\n"); 1697470decc6SDave Kleikamp return -EIO; 1698470decc6SDave Kleikamp } 1699470decc6SDave Kleikamp 1700470decc6SDave Kleikamp /** 1701f7f4bccbSMingming Cao * void jbd2_journal_destroy() - Release a journal_t structure. 1702470decc6SDave Kleikamp * @journal: Journal to act on. 1703470decc6SDave Kleikamp * 1704470decc6SDave Kleikamp * Release a journal_t structure once it is no longer in use by the 1705470decc6SDave Kleikamp * journaled object. 170644519fafSHidehiro Kawai * Return <0 if we couldn't clean up the journal. 1707470decc6SDave Kleikamp */ 170844519fafSHidehiro Kawai int jbd2_journal_destroy(journal_t *journal) 1709470decc6SDave Kleikamp { 171044519fafSHidehiro Kawai int err = 0; 171144519fafSHidehiro Kawai 1712470decc6SDave Kleikamp /* Wait for the commit thread to wake up and die. */ 1713470decc6SDave Kleikamp journal_kill_thread(journal); 1714470decc6SDave Kleikamp 1715470decc6SDave Kleikamp /* Force a final log commit */ 1716470decc6SDave Kleikamp if (journal->j_running_transaction) 1717f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 1718470decc6SDave Kleikamp 1719470decc6SDave Kleikamp /* Force any old transactions to disk */ 1720470decc6SDave Kleikamp 1721470decc6SDave Kleikamp /* Totally anal locking here... */ 1722470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1723470decc6SDave Kleikamp while (journal->j_checkpoint_transactions != NULL) { 1724470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 17256fa7aa50STejun Heo mutex_lock_io(&journal->j_checkpoint_mutex); 1726841df7dfSJan Kara err = jbd2_log_do_checkpoint(journal); 17271a0d3786STheodore Ts'o mutex_unlock(&journal->j_checkpoint_mutex); 1728841df7dfSJan Kara /* 1729841df7dfSJan Kara * If checkpointing failed, just free the buffers to avoid 1730841df7dfSJan Kara * looping forever 1731841df7dfSJan Kara */ 1732841df7dfSJan Kara if (err) { 1733841df7dfSJan Kara jbd2_journal_destroy_checkpoint(journal); 1734841df7dfSJan Kara spin_lock(&journal->j_list_lock); 1735841df7dfSJan Kara break; 1736841df7dfSJan Kara } 1737470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1738470decc6SDave Kleikamp } 1739470decc6SDave Kleikamp 1740470decc6SDave Kleikamp J_ASSERT(journal->j_running_transaction == NULL); 1741470decc6SDave Kleikamp J_ASSERT(journal->j_committing_transaction == NULL); 1742470decc6SDave Kleikamp J_ASSERT(journal->j_checkpoint_transactions == NULL); 1743470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 1744470decc6SDave Kleikamp 174544519fafSHidehiro Kawai if (journal->j_sb_buffer) { 174644519fafSHidehiro Kawai if (!is_journal_aborted(journal)) { 17476fa7aa50STejun Heo mutex_lock_io(&journal->j_checkpoint_mutex); 1748c0a2ad9bSOGAWA Hirofumi 1749c0a2ad9bSOGAWA Hirofumi write_lock(&journal->j_state_lock); 1750c0a2ad9bSOGAWA Hirofumi journal->j_tail_sequence = 1751c0a2ad9bSOGAWA Hirofumi ++journal->j_transaction_sequence; 1752c0a2ad9bSOGAWA Hirofumi write_unlock(&journal->j_state_lock); 1753c0a2ad9bSOGAWA Hirofumi 175470fd7614SChristoph Hellwig jbd2_mark_journal_empty(journal, 175517f423b5SJan Kara REQ_SYNC | REQ_PREFLUSH | REQ_FUA); 1756a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1757a78bb11dSJan Kara } else 175844519fafSHidehiro Kawai err = -EIO; 1759470decc6SDave Kleikamp brelse(journal->j_sb_buffer); 1760470decc6SDave Kleikamp } 1761470decc6SDave Kleikamp 17628e85fb3fSJohann Lombardi if (journal->j_proc_entry) 17638e85fb3fSJohann Lombardi jbd2_stats_proc_exit(journal); 1764470decc6SDave Kleikamp iput(journal->j_inode); 1765470decc6SDave Kleikamp if (journal->j_revoke) 1766f7f4bccbSMingming Cao jbd2_journal_destroy_revoke(journal); 176701b5adceSDarrick J. Wong if (journal->j_chksum_driver) 176801b5adceSDarrick J. Wong crypto_free_shash(journal->j_chksum_driver); 1769470decc6SDave Kleikamp kfree(journal->j_wbuf); 1770470decc6SDave Kleikamp kfree(journal); 177144519fafSHidehiro Kawai 177244519fafSHidehiro Kawai return err; 1773470decc6SDave Kleikamp } 1774470decc6SDave Kleikamp 1775470decc6SDave Kleikamp 1776470decc6SDave Kleikamp /** 1777f7f4bccbSMingming Cao *int jbd2_journal_check_used_features () - Check if features specified are used. 1778470decc6SDave Kleikamp * @journal: Journal to check. 1779470decc6SDave Kleikamp * @compat: bitmask of compatible features 1780470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1781470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1782470decc6SDave Kleikamp * 1783470decc6SDave Kleikamp * Check whether the journal uses all of a given set of 1784470decc6SDave Kleikamp * features. Return true (non-zero) if it does. 1785470decc6SDave Kleikamp **/ 1786470decc6SDave Kleikamp 1787f7f4bccbSMingming Cao int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, 1788470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1789470decc6SDave Kleikamp { 1790470decc6SDave Kleikamp journal_superblock_t *sb; 1791470decc6SDave Kleikamp 1792470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1793470decc6SDave Kleikamp return 1; 17941113e1b5SPatrick J. LoPresti /* Load journal superblock if it is not loaded yet. */ 17951113e1b5SPatrick J. LoPresti if (journal->j_format_version == 0 && 17961113e1b5SPatrick J. LoPresti journal_get_superblock(journal) != 0) 17971113e1b5SPatrick J. LoPresti return 0; 1798470decc6SDave Kleikamp if (journal->j_format_version == 1) 1799470decc6SDave Kleikamp return 0; 1800470decc6SDave Kleikamp 1801470decc6SDave Kleikamp sb = journal->j_superblock; 1802470decc6SDave Kleikamp 1803470decc6SDave Kleikamp if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && 1804470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && 1805470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) 1806470decc6SDave Kleikamp return 1; 1807470decc6SDave Kleikamp 1808470decc6SDave Kleikamp return 0; 1809470decc6SDave Kleikamp } 1810470decc6SDave Kleikamp 1811470decc6SDave Kleikamp /** 1812f7f4bccbSMingming Cao * int jbd2_journal_check_available_features() - Check feature set in journalling layer 1813470decc6SDave Kleikamp * @journal: Journal to check. 1814470decc6SDave Kleikamp * @compat: bitmask of compatible features 1815470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1816470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1817470decc6SDave Kleikamp * 1818470decc6SDave Kleikamp * Check whether the journaling code supports the use of 1819470decc6SDave Kleikamp * all of a given set of features on this journal. Return true 1820470decc6SDave Kleikamp * (non-zero) if it can. */ 1821470decc6SDave Kleikamp 1822f7f4bccbSMingming Cao int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, 1823470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1824470decc6SDave Kleikamp { 1825470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1826470decc6SDave Kleikamp return 1; 1827470decc6SDave Kleikamp 1828470decc6SDave Kleikamp /* We can support any known requested features iff the 1829470decc6SDave Kleikamp * superblock is in version 2. Otherwise we fail to support any 1830470decc6SDave Kleikamp * extended sb features. */ 1831470decc6SDave Kleikamp 1832470decc6SDave Kleikamp if (journal->j_format_version != 2) 1833470decc6SDave Kleikamp return 0; 1834470decc6SDave Kleikamp 1835f7f4bccbSMingming Cao if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && 1836f7f4bccbSMingming Cao (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && 1837f7f4bccbSMingming Cao (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) 1838470decc6SDave Kleikamp return 1; 1839470decc6SDave Kleikamp 1840470decc6SDave Kleikamp return 0; 1841470decc6SDave Kleikamp } 1842470decc6SDave Kleikamp 1843470decc6SDave Kleikamp /** 1844f7f4bccbSMingming Cao * int jbd2_journal_set_features () - Mark a given journal feature in the superblock 1845470decc6SDave Kleikamp * @journal: Journal to act on. 1846470decc6SDave Kleikamp * @compat: bitmask of compatible features 1847470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1848470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1849470decc6SDave Kleikamp * 1850470decc6SDave Kleikamp * Mark a given journal feature as present on the 1851470decc6SDave Kleikamp * superblock. Returns true if the requested features could be set. 1852470decc6SDave Kleikamp * 1853470decc6SDave Kleikamp */ 1854470decc6SDave Kleikamp 1855f7f4bccbSMingming Cao int jbd2_journal_set_features (journal_t *journal, unsigned long compat, 1856470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1857470decc6SDave Kleikamp { 185825ed6e8aSDarrick J. Wong #define INCOMPAT_FEATURE_ON(f) \ 185925ed6e8aSDarrick J. Wong ((incompat & (f)) && !(sb->s_feature_incompat & cpu_to_be32(f))) 186025ed6e8aSDarrick J. Wong #define COMPAT_FEATURE_ON(f) \ 186125ed6e8aSDarrick J. Wong ((compat & (f)) && !(sb->s_feature_compat & cpu_to_be32(f))) 1862470decc6SDave Kleikamp journal_superblock_t *sb; 1863470decc6SDave Kleikamp 1864f7f4bccbSMingming Cao if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) 1865470decc6SDave Kleikamp return 1; 1866470decc6SDave Kleikamp 1867f7f4bccbSMingming Cao if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) 1868470decc6SDave Kleikamp return 0; 1869470decc6SDave Kleikamp 1870db9ee220SDarrick J. Wong /* If enabling v2 checksums, turn on v3 instead */ 1871db9ee220SDarrick J. Wong if (incompat & JBD2_FEATURE_INCOMPAT_CSUM_V2) { 1872db9ee220SDarrick J. Wong incompat &= ~JBD2_FEATURE_INCOMPAT_CSUM_V2; 1873db9ee220SDarrick J. Wong incompat |= JBD2_FEATURE_INCOMPAT_CSUM_V3; 1874db9ee220SDarrick J. Wong } 1875db9ee220SDarrick J. Wong 1876db9ee220SDarrick J. Wong /* Asking for checksumming v3 and v1? Only give them v3. */ 1877db9ee220SDarrick J. Wong if (incompat & JBD2_FEATURE_INCOMPAT_CSUM_V3 && 187825ed6e8aSDarrick J. Wong compat & JBD2_FEATURE_COMPAT_CHECKSUM) 187925ed6e8aSDarrick J. Wong compat &= ~JBD2_FEATURE_COMPAT_CHECKSUM; 188025ed6e8aSDarrick J. Wong 1881470decc6SDave Kleikamp jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", 1882470decc6SDave Kleikamp compat, ro, incompat); 1883470decc6SDave Kleikamp 1884470decc6SDave Kleikamp sb = journal->j_superblock; 1885470decc6SDave Kleikamp 1886538bcaa6STheodore Ts'o /* Load the checksum driver if necessary */ 1887538bcaa6STheodore Ts'o if ((journal->j_chksum_driver == NULL) && 1888538bcaa6STheodore Ts'o INCOMPAT_FEATURE_ON(JBD2_FEATURE_INCOMPAT_CSUM_V3)) { 1889538bcaa6STheodore Ts'o journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 1890538bcaa6STheodore Ts'o if (IS_ERR(journal->j_chksum_driver)) { 1891538bcaa6STheodore Ts'o printk(KERN_ERR "JBD2: Cannot load crc32c driver.\n"); 1892538bcaa6STheodore Ts'o journal->j_chksum_driver = NULL; 1893538bcaa6STheodore Ts'o return 0; 1894538bcaa6STheodore Ts'o } 1895538bcaa6STheodore Ts'o /* Precompute checksum seed for all metadata */ 1896538bcaa6STheodore Ts'o journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid, 1897538bcaa6STheodore Ts'o sizeof(sb->s_uuid)); 1898538bcaa6STheodore Ts'o } 1899538bcaa6STheodore Ts'o 1900538bcaa6STheodore Ts'o lock_buffer(journal->j_sb_buffer); 1901538bcaa6STheodore Ts'o 1902db9ee220SDarrick J. Wong /* If enabling v3 checksums, update superblock */ 1903db9ee220SDarrick J. Wong if (INCOMPAT_FEATURE_ON(JBD2_FEATURE_INCOMPAT_CSUM_V3)) { 190425ed6e8aSDarrick J. Wong sb->s_checksum_type = JBD2_CRC32C_CHKSUM; 190525ed6e8aSDarrick J. Wong sb->s_feature_compat &= 190625ed6e8aSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM); 190732f38691SDarrick J. Wong } 190825ed6e8aSDarrick J. Wong 190925ed6e8aSDarrick J. Wong /* If enabling v1 checksums, downgrade superblock */ 191025ed6e8aSDarrick J. Wong if (COMPAT_FEATURE_ON(JBD2_FEATURE_COMPAT_CHECKSUM)) 191125ed6e8aSDarrick J. Wong sb->s_feature_incompat &= 1912db9ee220SDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2 | 1913db9ee220SDarrick J. Wong JBD2_FEATURE_INCOMPAT_CSUM_V3); 191425ed6e8aSDarrick J. Wong 1915470decc6SDave Kleikamp sb->s_feature_compat |= cpu_to_be32(compat); 1916470decc6SDave Kleikamp sb->s_feature_ro_compat |= cpu_to_be32(ro); 1917470decc6SDave Kleikamp sb->s_feature_incompat |= cpu_to_be32(incompat); 1918538bcaa6STheodore Ts'o unlock_buffer(journal->j_sb_buffer); 1919470decc6SDave Kleikamp 1920470decc6SDave Kleikamp return 1; 192125ed6e8aSDarrick J. Wong #undef COMPAT_FEATURE_ON 192225ed6e8aSDarrick J. Wong #undef INCOMPAT_FEATURE_ON 1923470decc6SDave Kleikamp } 1924470decc6SDave Kleikamp 1925818d276cSGirish Shilamkar /* 1926818d276cSGirish Shilamkar * jbd2_journal_clear_features () - Clear a given journal feature in the 1927818d276cSGirish Shilamkar * superblock 1928818d276cSGirish Shilamkar * @journal: Journal to act on. 1929818d276cSGirish Shilamkar * @compat: bitmask of compatible features 1930818d276cSGirish Shilamkar * @ro: bitmask of features that force read-only mount 1931818d276cSGirish Shilamkar * @incompat: bitmask of incompatible features 1932818d276cSGirish Shilamkar * 1933818d276cSGirish Shilamkar * Clear a given journal feature as present on the 1934818d276cSGirish Shilamkar * superblock. 1935818d276cSGirish Shilamkar */ 1936818d276cSGirish Shilamkar void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, 1937818d276cSGirish Shilamkar unsigned long ro, unsigned long incompat) 1938818d276cSGirish Shilamkar { 1939818d276cSGirish Shilamkar journal_superblock_t *sb; 1940818d276cSGirish Shilamkar 1941818d276cSGirish Shilamkar jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", 1942818d276cSGirish Shilamkar compat, ro, incompat); 1943818d276cSGirish Shilamkar 1944818d276cSGirish Shilamkar sb = journal->j_superblock; 1945818d276cSGirish Shilamkar 1946818d276cSGirish Shilamkar sb->s_feature_compat &= ~cpu_to_be32(compat); 1947818d276cSGirish Shilamkar sb->s_feature_ro_compat &= ~cpu_to_be32(ro); 1948818d276cSGirish Shilamkar sb->s_feature_incompat &= ~cpu_to_be32(incompat); 1949818d276cSGirish Shilamkar } 1950818d276cSGirish Shilamkar EXPORT_SYMBOL(jbd2_journal_clear_features); 1951470decc6SDave Kleikamp 1952470decc6SDave Kleikamp /** 1953f7f4bccbSMingming Cao * int jbd2_journal_flush () - Flush journal 1954470decc6SDave Kleikamp * @journal: Journal to act on. 1955470decc6SDave Kleikamp * 1956470decc6SDave Kleikamp * Flush all data for a given journal to disk and empty the journal. 1957470decc6SDave Kleikamp * Filesystems can use this when remounting readonly to ensure that 1958470decc6SDave Kleikamp * recovery does not need to happen on remount. 1959470decc6SDave Kleikamp */ 1960470decc6SDave Kleikamp 1961f7f4bccbSMingming Cao int jbd2_journal_flush(journal_t *journal) 1962470decc6SDave Kleikamp { 1963470decc6SDave Kleikamp int err = 0; 1964470decc6SDave Kleikamp transaction_t *transaction = NULL; 1965470decc6SDave Kleikamp 1966a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1967470decc6SDave Kleikamp 1968470decc6SDave Kleikamp /* Force everything buffered to the log... */ 1969470decc6SDave Kleikamp if (journal->j_running_transaction) { 1970470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1971f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1972470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 1973470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 1974470decc6SDave Kleikamp 1975470decc6SDave Kleikamp /* Wait for the log commit to complete... */ 1976470decc6SDave Kleikamp if (transaction) { 1977470decc6SDave Kleikamp tid_t tid = transaction->t_tid; 1978470decc6SDave Kleikamp 1979a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1980f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 1981470decc6SDave Kleikamp } else { 1982a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1983470decc6SDave Kleikamp } 1984470decc6SDave Kleikamp 1985470decc6SDave Kleikamp /* ...and flush everything in the log out to disk. */ 1986470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1987470decc6SDave Kleikamp while (!err && journal->j_checkpoint_transactions != NULL) { 1988470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 19896fa7aa50STejun Heo mutex_lock_io(&journal->j_checkpoint_mutex); 1990f7f4bccbSMingming Cao err = jbd2_log_do_checkpoint(journal); 199144519fafSHidehiro Kawai mutex_unlock(&journal->j_checkpoint_mutex); 1992470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1993470decc6SDave Kleikamp } 1994470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 199544519fafSHidehiro Kawai 199644519fafSHidehiro Kawai if (is_journal_aborted(journal)) 199744519fafSHidehiro Kawai return -EIO; 199844519fafSHidehiro Kawai 19996fa7aa50STejun Heo mutex_lock_io(&journal->j_checkpoint_mutex); 20006f6a6fdaSJoseph Qi if (!err) { 20016f6a6fdaSJoseph Qi err = jbd2_cleanup_journal_tail(journal); 20026f6a6fdaSJoseph Qi if (err < 0) { 20036f6a6fdaSJoseph Qi mutex_unlock(&journal->j_checkpoint_mutex); 20046f6a6fdaSJoseph Qi goto out; 20056f6a6fdaSJoseph Qi } 20066f6a6fdaSJoseph Qi err = 0; 20076f6a6fdaSJoseph Qi } 2008470decc6SDave Kleikamp 2009470decc6SDave Kleikamp /* Finally, mark the journal as really needing no recovery. 2010470decc6SDave Kleikamp * This sets s_start==0 in the underlying superblock, which is 2011470decc6SDave Kleikamp * the magic code for a fully-recovered superblock. Any future 2012470decc6SDave Kleikamp * commits of data to the journal will restore the current 2013470decc6SDave Kleikamp * s_start value. */ 201417f423b5SJan Kara jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA); 2015a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 2016a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2017470decc6SDave Kleikamp J_ASSERT(!journal->j_running_transaction); 2018470decc6SDave Kleikamp J_ASSERT(!journal->j_committing_transaction); 2019470decc6SDave Kleikamp J_ASSERT(!journal->j_checkpoint_transactions); 2020470decc6SDave Kleikamp J_ASSERT(journal->j_head == journal->j_tail); 2021470decc6SDave Kleikamp J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); 2022a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 20236f6a6fdaSJoseph Qi out: 20246f6a6fdaSJoseph Qi return err; 2025470decc6SDave Kleikamp } 2026470decc6SDave Kleikamp 2027470decc6SDave Kleikamp /** 2028f7f4bccbSMingming Cao * int jbd2_journal_wipe() - Wipe journal contents 2029470decc6SDave Kleikamp * @journal: Journal to act on. 2030470decc6SDave Kleikamp * @write: flag (see below) 2031470decc6SDave Kleikamp * 2032470decc6SDave Kleikamp * Wipe out all of the contents of a journal, safely. This will produce 2033470decc6SDave Kleikamp * a warning if the journal contains any valid recovery information. 2034f7f4bccbSMingming Cao * Must be called between journal_init_*() and jbd2_journal_load(). 2035470decc6SDave Kleikamp * 2036470decc6SDave Kleikamp * If 'write' is non-zero, then we wipe out the journal on disk; otherwise 2037470decc6SDave Kleikamp * we merely suppress recovery. 2038470decc6SDave Kleikamp */ 2039470decc6SDave Kleikamp 2040f7f4bccbSMingming Cao int jbd2_journal_wipe(journal_t *journal, int write) 2041470decc6SDave Kleikamp { 2042470decc6SDave Kleikamp int err = 0; 2043470decc6SDave Kleikamp 2044f7f4bccbSMingming Cao J_ASSERT (!(journal->j_flags & JBD2_LOADED)); 2045470decc6SDave Kleikamp 2046470decc6SDave Kleikamp err = load_superblock(journal); 2047470decc6SDave Kleikamp if (err) 2048470decc6SDave Kleikamp return err; 2049470decc6SDave Kleikamp 2050470decc6SDave Kleikamp if (!journal->j_tail) 2051470decc6SDave Kleikamp goto no_recovery; 2052470decc6SDave Kleikamp 2053f2a44523SEryu Guan printk(KERN_WARNING "JBD2: %s recovery information on journal\n", 2054470decc6SDave Kleikamp write ? "Clearing" : "Ignoring"); 2055470decc6SDave Kleikamp 2056f7f4bccbSMingming Cao err = jbd2_journal_skip_recovery(journal); 2057a78bb11dSJan Kara if (write) { 2058a78bb11dSJan Kara /* Lock to make assertions happy... */ 205953cf9784SXiaoguang Wang mutex_lock_io(&journal->j_checkpoint_mutex); 206017f423b5SJan Kara jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA); 2061a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 2062a78bb11dSJan Kara } 2063470decc6SDave Kleikamp 2064470decc6SDave Kleikamp no_recovery: 2065470decc6SDave Kleikamp return err; 2066470decc6SDave Kleikamp } 2067470decc6SDave Kleikamp 2068470decc6SDave Kleikamp /* 2069470decc6SDave Kleikamp * Journal abort has very specific semantics, which we describe 2070470decc6SDave Kleikamp * for journal abort. 2071470decc6SDave Kleikamp * 2072bfcd3555SAlberto Bertogli * Two internal functions, which provide abort to the jbd layer 2073470decc6SDave Kleikamp * itself are here. 2074470decc6SDave Kleikamp */ 2075470decc6SDave Kleikamp 2076470decc6SDave Kleikamp /* 2077470decc6SDave Kleikamp * Quick version for internal journal use (doesn't lock the journal). 2078470decc6SDave Kleikamp * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, 2079470decc6SDave Kleikamp * and don't attempt to make any other journal updates. 2080470decc6SDave Kleikamp */ 2081f7f4bccbSMingming Cao void __jbd2_journal_abort_hard(journal_t *journal) 2082470decc6SDave Kleikamp { 2083470decc6SDave Kleikamp transaction_t *transaction; 2084470decc6SDave Kleikamp 2085f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2086470decc6SDave Kleikamp return; 2087470decc6SDave Kleikamp 2088470decc6SDave Kleikamp printk(KERN_ERR "Aborting journal on device %s.\n", 208905496769STheodore Ts'o journal->j_devname); 2090470decc6SDave Kleikamp 2091a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2092f7f4bccbSMingming Cao journal->j_flags |= JBD2_ABORT; 2093470decc6SDave Kleikamp transaction = journal->j_running_transaction; 2094470decc6SDave Kleikamp if (transaction) 2095f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 2096a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2097470decc6SDave Kleikamp } 2098470decc6SDave Kleikamp 2099470decc6SDave Kleikamp /* Soft abort: record the abort error status in the journal superblock, 2100470decc6SDave Kleikamp * but don't do any other IO. */ 2101470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno) 2102470decc6SDave Kleikamp { 2103fb7c0244STheodore Ts'o int old_errno; 2104470decc6SDave Kleikamp 2105fb7c0244STheodore Ts'o write_lock(&journal->j_state_lock); 2106fb7c0244STheodore Ts'o old_errno = journal->j_errno; 2107fb7c0244STheodore Ts'o if (!journal->j_errno || errno == -ESHUTDOWN) 2108470decc6SDave Kleikamp journal->j_errno = errno; 2109470decc6SDave Kleikamp 2110fb7c0244STheodore Ts'o if (journal->j_flags & JBD2_ABORT) { 2111fb7c0244STheodore Ts'o write_unlock(&journal->j_state_lock); 2112fb7c0244STheodore Ts'o if (!old_errno && old_errno != -ESHUTDOWN && 2113fb7c0244STheodore Ts'o errno == -ESHUTDOWN) 2114fb7c0244STheodore Ts'o jbd2_journal_update_sb_errno(journal); 2115fb7c0244STheodore Ts'o return; 2116fb7c0244STheodore Ts'o } 2117fb7c0244STheodore Ts'o write_unlock(&journal->j_state_lock); 2118fb7c0244STheodore Ts'o 2119f7f4bccbSMingming Cao __jbd2_journal_abort_hard(journal); 2120470decc6SDave Kleikamp 21214327ba52SDaeho Jeong if (errno) { 212224bcc89cSJan Kara jbd2_journal_update_sb_errno(journal); 21234327ba52SDaeho Jeong write_lock(&journal->j_state_lock); 21244327ba52SDaeho Jeong journal->j_flags |= JBD2_REC_ERR; 21254327ba52SDaeho Jeong write_unlock(&journal->j_state_lock); 21264327ba52SDaeho Jeong } 2127470decc6SDave Kleikamp } 2128470decc6SDave Kleikamp 2129470decc6SDave Kleikamp /** 2130f7f4bccbSMingming Cao * void jbd2_journal_abort () - Shutdown the journal immediately. 2131470decc6SDave Kleikamp * @journal: the journal to shutdown. 2132470decc6SDave Kleikamp * @errno: an error number to record in the journal indicating 2133470decc6SDave Kleikamp * the reason for the shutdown. 2134470decc6SDave Kleikamp * 2135470decc6SDave Kleikamp * Perform a complete, immediate shutdown of the ENTIRE 2136470decc6SDave Kleikamp * journal (not of a single transaction). This operation cannot be 2137470decc6SDave Kleikamp * undone without closing and reopening the journal. 2138470decc6SDave Kleikamp * 2139f7f4bccbSMingming Cao * The jbd2_journal_abort function is intended to support higher level error 2140470decc6SDave Kleikamp * recovery mechanisms such as the ext2/ext3 remount-readonly error 2141470decc6SDave Kleikamp * mode. 2142470decc6SDave Kleikamp * 2143470decc6SDave Kleikamp * Journal abort has very specific semantics. Any existing dirty, 2144470decc6SDave Kleikamp * unjournaled buffers in the main filesystem will still be written to 2145470decc6SDave Kleikamp * disk by bdflush, but the journaling mechanism will be suspended 2146470decc6SDave Kleikamp * immediately and no further transaction commits will be honoured. 2147470decc6SDave Kleikamp * 2148470decc6SDave Kleikamp * Any dirty, journaled buffers will be written back to disk without 2149470decc6SDave Kleikamp * hitting the journal. Atomicity cannot be guaranteed on an aborted 2150470decc6SDave Kleikamp * filesystem, but we _do_ attempt to leave as much data as possible 2151470decc6SDave Kleikamp * behind for fsck to use for cleanup. 2152470decc6SDave Kleikamp * 2153470decc6SDave Kleikamp * Any attempt to get a new transaction handle on a journal which is in 2154470decc6SDave Kleikamp * ABORT state will just result in an -EROFS error return. A 2155f7f4bccbSMingming Cao * jbd2_journal_stop on an existing handle will return -EIO if we have 2156470decc6SDave Kleikamp * entered abort state during the update. 2157470decc6SDave Kleikamp * 2158470decc6SDave Kleikamp * Recursive transactions are not disturbed by journal abort until the 2159f7f4bccbSMingming Cao * final jbd2_journal_stop, which will receive the -EIO error. 2160470decc6SDave Kleikamp * 2161f7f4bccbSMingming Cao * Finally, the jbd2_journal_abort call allows the caller to supply an errno 2162470decc6SDave Kleikamp * which will be recorded (if possible) in the journal superblock. This 2163470decc6SDave Kleikamp * allows a client to record failure conditions in the middle of a 2164470decc6SDave Kleikamp * transaction without having to complete the transaction to record the 2165470decc6SDave Kleikamp * failure to disk. ext3_error, for example, now uses this 2166470decc6SDave Kleikamp * functionality. 2167470decc6SDave Kleikamp * 2168470decc6SDave Kleikamp * Errors which originate from within the journaling layer will NOT 2169470decc6SDave Kleikamp * supply an errno; a null errno implies that absolutely no further 2170470decc6SDave Kleikamp * writes are done to the journal (unless there are any already in 2171470decc6SDave Kleikamp * progress). 2172470decc6SDave Kleikamp * 2173470decc6SDave Kleikamp */ 2174470decc6SDave Kleikamp 2175f7f4bccbSMingming Cao void jbd2_journal_abort(journal_t *journal, int errno) 2176470decc6SDave Kleikamp { 2177470decc6SDave Kleikamp __journal_abort_soft(journal, errno); 2178470decc6SDave Kleikamp } 2179470decc6SDave Kleikamp 2180470decc6SDave Kleikamp /** 2181f7f4bccbSMingming Cao * int jbd2_journal_errno () - returns the journal's error state. 2182470decc6SDave Kleikamp * @journal: journal to examine. 2183470decc6SDave Kleikamp * 2184bfcd3555SAlberto Bertogli * This is the errno number set with jbd2_journal_abort(), the last 2185470decc6SDave Kleikamp * time the journal was mounted - if the journal was stopped 2186470decc6SDave Kleikamp * without calling abort this will be 0. 2187470decc6SDave Kleikamp * 2188470decc6SDave Kleikamp * If the journal has been aborted on this mount time -EROFS will 2189470decc6SDave Kleikamp * be returned. 2190470decc6SDave Kleikamp */ 2191f7f4bccbSMingming Cao int jbd2_journal_errno(journal_t *journal) 2192470decc6SDave Kleikamp { 2193470decc6SDave Kleikamp int err; 2194470decc6SDave Kleikamp 2195a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 2196f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2197470decc6SDave Kleikamp err = -EROFS; 2198470decc6SDave Kleikamp else 2199470decc6SDave Kleikamp err = journal->j_errno; 2200a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 2201470decc6SDave Kleikamp return err; 2202470decc6SDave Kleikamp } 2203470decc6SDave Kleikamp 2204470decc6SDave Kleikamp /** 2205f7f4bccbSMingming Cao * int jbd2_journal_clear_err () - clears the journal's error state 2206470decc6SDave Kleikamp * @journal: journal to act on. 2207470decc6SDave Kleikamp * 2208bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 2209470decc6SDave Kleikamp * mode. 2210470decc6SDave Kleikamp */ 2211f7f4bccbSMingming Cao int jbd2_journal_clear_err(journal_t *journal) 2212470decc6SDave Kleikamp { 2213470decc6SDave Kleikamp int err = 0; 2214470decc6SDave Kleikamp 2215a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2216f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2217470decc6SDave Kleikamp err = -EROFS; 2218470decc6SDave Kleikamp else 2219470decc6SDave Kleikamp journal->j_errno = 0; 2220a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2221470decc6SDave Kleikamp return err; 2222470decc6SDave Kleikamp } 2223470decc6SDave Kleikamp 2224470decc6SDave Kleikamp /** 2225f7f4bccbSMingming Cao * void jbd2_journal_ack_err() - Ack journal err. 2226470decc6SDave Kleikamp * @journal: journal to act on. 2227470decc6SDave Kleikamp * 2228bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 2229470decc6SDave Kleikamp * mode. 2230470decc6SDave Kleikamp */ 2231f7f4bccbSMingming Cao void jbd2_journal_ack_err(journal_t *journal) 2232470decc6SDave Kleikamp { 2233a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2234470decc6SDave Kleikamp if (journal->j_errno) 2235f7f4bccbSMingming Cao journal->j_flags |= JBD2_ACK_ERR; 2236a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2237470decc6SDave Kleikamp } 2238470decc6SDave Kleikamp 2239f7f4bccbSMingming Cao int jbd2_journal_blocks_per_page(struct inode *inode) 2240470decc6SDave Kleikamp { 224109cbfeafSKirill A. Shutemov return 1 << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits); 2242470decc6SDave Kleikamp } 2243470decc6SDave Kleikamp 2244470decc6SDave Kleikamp /* 2245b517bea1SZach Brown * helper functions to deal with 32 or 64bit block numbers. 2246b517bea1SZach Brown */ 2247b517bea1SZach Brown size_t journal_tag_bytes(journal_t *journal) 2248b517bea1SZach Brown { 2249db9ee220SDarrick J. Wong size_t sz; 2250db9ee220SDarrick J. Wong 225156316a0dSDarrick J. Wong if (jbd2_has_feature_csum3(journal)) 2252db9ee220SDarrick J. Wong return sizeof(journal_block_tag3_t); 2253db9ee220SDarrick J. Wong 2254db9ee220SDarrick J. Wong sz = sizeof(journal_block_tag_t); 2255c3900875SDarrick J. Wong 225656316a0dSDarrick J. Wong if (jbd2_has_feature_csum2(journal)) 2257db9ee220SDarrick J. Wong sz += sizeof(__u16); 2258c3900875SDarrick J. Wong 225956316a0dSDarrick J. Wong if (jbd2_has_feature_64bit(journal)) 2260db9ee220SDarrick J. Wong return sz; 2261b517bea1SZach Brown else 2262db9ee220SDarrick J. Wong return sz - sizeof(__u32); 2263b517bea1SZach Brown } 2264b517bea1SZach Brown 2265b517bea1SZach Brown /* 2266d2eecb03STheodore Ts'o * JBD memory management 2267d2eecb03STheodore Ts'o * 2268d2eecb03STheodore Ts'o * These functions are used to allocate block-sized chunks of memory 2269d2eecb03STheodore Ts'o * used for making copies of buffer_head data. Very often it will be 2270d2eecb03STheodore Ts'o * page-sized chunks of data, but sometimes it will be in 2271d2eecb03STheodore Ts'o * sub-page-size chunks. (For example, 16k pages on Power systems 2272d2eecb03STheodore Ts'o * with a 4k block file system.) For blocks smaller than a page, we 2273d2eecb03STheodore Ts'o * use a SLAB allocator. There are slab caches for each block size, 2274d2eecb03STheodore Ts'o * which are allocated at mount time, if necessary, and we only free 2275d2eecb03STheodore Ts'o * (all of) the slab caches when/if the jbd2 module is unloaded. For 2276d2eecb03STheodore Ts'o * this reason we don't need to a mutex to protect access to 2277d2eecb03STheodore Ts'o * jbd2_slab[] allocating or releasing memory; only in 2278d2eecb03STheodore Ts'o * jbd2_journal_create_slab(). 2279d2eecb03STheodore Ts'o */ 2280d2eecb03STheodore Ts'o #define JBD2_MAX_SLABS 8 2281d2eecb03STheodore Ts'o static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; 2282d2eecb03STheodore Ts'o 2283d2eecb03STheodore Ts'o static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { 2284d2eecb03STheodore Ts'o "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", 2285d2eecb03STheodore Ts'o "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" 2286d2eecb03STheodore Ts'o }; 2287d2eecb03STheodore Ts'o 2288d2eecb03STheodore Ts'o 2289d2eecb03STheodore Ts'o static void jbd2_journal_destroy_slabs(void) 2290d2eecb03STheodore Ts'o { 2291d2eecb03STheodore Ts'o int i; 2292d2eecb03STheodore Ts'o 2293d2eecb03STheodore Ts'o for (i = 0; i < JBD2_MAX_SLABS; i++) { 2294d2eecb03STheodore Ts'o kmem_cache_destroy(jbd2_slab[i]); 2295d2eecb03STheodore Ts'o jbd2_slab[i] = NULL; 2296d2eecb03STheodore Ts'o } 2297d2eecb03STheodore Ts'o } 2298d2eecb03STheodore Ts'o 2299d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t size) 2300d2eecb03STheodore Ts'o { 230151dfacdeSThomas Gleixner static DEFINE_MUTEX(jbd2_slab_create_mutex); 2302d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2303d2eecb03STheodore Ts'o size_t slab_size; 2304d2eecb03STheodore Ts'o 2305d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2306d2eecb03STheodore Ts'o return 0; 2307d2eecb03STheodore Ts'o 2308d2eecb03STheodore Ts'o if (i >= JBD2_MAX_SLABS) 2309d2eecb03STheodore Ts'o return -EINVAL; 2310d2eecb03STheodore Ts'o 2311d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2312d2eecb03STheodore Ts'o i = 0; 231351dfacdeSThomas Gleixner mutex_lock(&jbd2_slab_create_mutex); 2314d2eecb03STheodore Ts'o if (jbd2_slab[i]) { 231551dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2316d2eecb03STheodore Ts'o return 0; /* Already created */ 2317d2eecb03STheodore Ts'o } 2318d2eecb03STheodore Ts'o 2319d2eecb03STheodore Ts'o slab_size = 1 << (i+10); 2320d2eecb03STheodore Ts'o jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, 2321d2eecb03STheodore Ts'o slab_size, 0, NULL); 232251dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2323d2eecb03STheodore Ts'o if (!jbd2_slab[i]) { 2324d2eecb03STheodore Ts'o printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); 2325d2eecb03STheodore Ts'o return -ENOMEM; 2326d2eecb03STheodore Ts'o } 2327d2eecb03STheodore Ts'o return 0; 2328d2eecb03STheodore Ts'o } 2329d2eecb03STheodore Ts'o 2330d2eecb03STheodore Ts'o static struct kmem_cache *get_slab(size_t size) 2331d2eecb03STheodore Ts'o { 2332d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2333d2eecb03STheodore Ts'o 2334d2eecb03STheodore Ts'o BUG_ON(i >= JBD2_MAX_SLABS); 2335d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2336d2eecb03STheodore Ts'o i = 0; 23378ac97b74SBill Pemberton BUG_ON(jbd2_slab[i] == NULL); 2338d2eecb03STheodore Ts'o return jbd2_slab[i]; 2339d2eecb03STheodore Ts'o } 2340d2eecb03STheodore Ts'o 2341d2eecb03STheodore Ts'o void *jbd2_alloc(size_t size, gfp_t flags) 2342d2eecb03STheodore Ts'o { 2343d2eecb03STheodore Ts'o void *ptr; 2344d2eecb03STheodore Ts'o 2345d2eecb03STheodore Ts'o BUG_ON(size & (size-1)); /* Must be a power of 2 */ 2346d2eecb03STheodore Ts'o 2347f2db1971SMichal Hocko if (size < PAGE_SIZE) 2348d2eecb03STheodore Ts'o ptr = kmem_cache_alloc(get_slab(size), flags); 2349f2db1971SMichal Hocko else 2350f2db1971SMichal Hocko ptr = (void *)__get_free_pages(flags, get_order(size)); 2351d2eecb03STheodore Ts'o 2352d2eecb03STheodore Ts'o /* Check alignment; SLUB has gotten this wrong in the past, 2353d2eecb03STheodore Ts'o * and this can lead to user data corruption! */ 2354d2eecb03STheodore Ts'o BUG_ON(((unsigned long) ptr) & (size-1)); 2355d2eecb03STheodore Ts'o 2356d2eecb03STheodore Ts'o return ptr; 2357d2eecb03STheodore Ts'o } 2358d2eecb03STheodore Ts'o 2359d2eecb03STheodore Ts'o void jbd2_free(void *ptr, size_t size) 2360d2eecb03STheodore Ts'o { 2361f2db1971SMichal Hocko if (size < PAGE_SIZE) 2362d2eecb03STheodore Ts'o kmem_cache_free(get_slab(size), ptr); 2363f2db1971SMichal Hocko else 2364f2db1971SMichal Hocko free_pages((unsigned long)ptr, get_order(size)); 2365d2eecb03STheodore Ts'o }; 2366d2eecb03STheodore Ts'o 2367d2eecb03STheodore Ts'o /* 2368470decc6SDave Kleikamp * Journal_head storage management 2369470decc6SDave Kleikamp */ 2370e18b890bSChristoph Lameter static struct kmem_cache *jbd2_journal_head_cache; 2371e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2372470decc6SDave Kleikamp static atomic_t nr_journal_heads = ATOMIC_INIT(0); 2373470decc6SDave Kleikamp #endif 2374470decc6SDave Kleikamp 23750d52154bSChengguang Xu static int __init jbd2_journal_init_journal_head_cache(void) 2376470decc6SDave Kleikamp { 23770d52154bSChengguang Xu J_ASSERT(!jbd2_journal_head_cache); 2378a920e941SJohann Lombardi jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", 2379470decc6SDave Kleikamp sizeof(struct journal_head), 2380470decc6SDave Kleikamp 0, /* offset */ 23815f0d5a3aSPaul E. McKenney SLAB_TEMPORARY | SLAB_TYPESAFE_BY_RCU, 238220c2df83SPaul Mundt NULL); /* ctor */ 23831076d17aSAl Viro if (!jbd2_journal_head_cache) { 2384f2a44523SEryu Guan printk(KERN_EMERG "JBD2: no memory for journal_head cache\n"); 23850d52154bSChengguang Xu return -ENOMEM; 2386470decc6SDave Kleikamp } 23870d52154bSChengguang Xu return 0; 2388470decc6SDave Kleikamp } 2389470decc6SDave Kleikamp 23904185a2acSYongqiang Yang static void jbd2_journal_destroy_journal_head_cache(void) 2391470decc6SDave Kleikamp { 2392f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_journal_head_cache); 2393f7f4bccbSMingming Cao jbd2_journal_head_cache = NULL; 2394470decc6SDave Kleikamp } 2395470decc6SDave Kleikamp 2396470decc6SDave Kleikamp /* 2397470decc6SDave Kleikamp * journal_head splicing and dicing 2398470decc6SDave Kleikamp */ 2399470decc6SDave Kleikamp static struct journal_head *journal_alloc_journal_head(void) 2400470decc6SDave Kleikamp { 2401470decc6SDave Kleikamp struct journal_head *ret; 2402470decc6SDave Kleikamp 2403e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2404470decc6SDave Kleikamp atomic_inc(&nr_journal_heads); 2405470decc6SDave Kleikamp #endif 24065d9cf9c6SZheng Liu ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS); 24071076d17aSAl Viro if (!ret) { 2408470decc6SDave Kleikamp jbd_debug(1, "out of memory for journal_head\n"); 2409670be5a7STheodore Ts'o pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__); 24107b506b10SMichal Hocko ret = kmem_cache_zalloc(jbd2_journal_head_cache, 24117b506b10SMichal Hocko GFP_NOFS | __GFP_NOFAIL); 2412470decc6SDave Kleikamp } 241346417064SThomas Gleixner if (ret) 241446417064SThomas Gleixner spin_lock_init(&ret->b_state_lock); 2415470decc6SDave Kleikamp return ret; 2416470decc6SDave Kleikamp } 2417470decc6SDave Kleikamp 2418470decc6SDave Kleikamp static void journal_free_journal_head(struct journal_head *jh) 2419470decc6SDave Kleikamp { 2420e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2421470decc6SDave Kleikamp atomic_dec(&nr_journal_heads); 2422cd02ff0bSMingming Cao memset(jh, JBD2_POISON_FREE, sizeof(*jh)); 2423470decc6SDave Kleikamp #endif 2424f7f4bccbSMingming Cao kmem_cache_free(jbd2_journal_head_cache, jh); 2425470decc6SDave Kleikamp } 2426470decc6SDave Kleikamp 2427470decc6SDave Kleikamp /* 2428470decc6SDave Kleikamp * A journal_head is attached to a buffer_head whenever JBD has an 2429470decc6SDave Kleikamp * interest in the buffer. 2430470decc6SDave Kleikamp * 2431470decc6SDave Kleikamp * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit 2432470decc6SDave Kleikamp * is set. This bit is tested in core kernel code where we need to take 2433470decc6SDave Kleikamp * JBD-specific actions. Testing the zeroness of ->b_private is not reliable 2434470decc6SDave Kleikamp * there. 2435470decc6SDave Kleikamp * 2436470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. 2437470decc6SDave Kleikamp * 2438470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set it is immune from being released by 2439470decc6SDave Kleikamp * core kernel code, mainly via ->b_count. 2440470decc6SDave Kleikamp * 2441de1b7941SJan Kara * A journal_head is detached from its buffer_head when the journal_head's 2442de1b7941SJan Kara * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint 2443de1b7941SJan Kara * transaction (b_cp_transaction) hold their references to b_jcount. 2444470decc6SDave Kleikamp * 2445470decc6SDave Kleikamp * Various places in the kernel want to attach a journal_head to a buffer_head 2446470decc6SDave Kleikamp * _before_ attaching the journal_head to a transaction. To protect the 2447f7f4bccbSMingming Cao * journal_head in this situation, jbd2_journal_add_journal_head elevates the 2448470decc6SDave Kleikamp * journal_head's b_jcount refcount by one. The caller must call 2449f7f4bccbSMingming Cao * jbd2_journal_put_journal_head() to undo this. 2450470decc6SDave Kleikamp * 2451470decc6SDave Kleikamp * So the typical usage would be: 2452470decc6SDave Kleikamp * 2453470decc6SDave Kleikamp * (Attach a journal_head if needed. Increments b_jcount) 2454f7f4bccbSMingming Cao * struct journal_head *jh = jbd2_journal_add_journal_head(bh); 2455470decc6SDave Kleikamp * ... 2456de1b7941SJan Kara * (Get another reference for transaction) 2457de1b7941SJan Kara * jbd2_journal_grab_journal_head(bh); 2458470decc6SDave Kleikamp * jh->b_transaction = xxx; 2459de1b7941SJan Kara * (Put original reference) 2460f7f4bccbSMingming Cao * jbd2_journal_put_journal_head(jh); 2461470decc6SDave Kleikamp */ 2462470decc6SDave Kleikamp 2463470decc6SDave Kleikamp /* 2464470decc6SDave Kleikamp * Give a buffer_head a journal_head. 2465470decc6SDave Kleikamp * 2466470decc6SDave Kleikamp * May sleep. 2467470decc6SDave Kleikamp */ 2468f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) 2469470decc6SDave Kleikamp { 2470470decc6SDave Kleikamp struct journal_head *jh; 2471470decc6SDave Kleikamp struct journal_head *new_jh = NULL; 2472470decc6SDave Kleikamp 2473470decc6SDave Kleikamp repeat: 24745d9cf9c6SZheng Liu if (!buffer_jbd(bh)) 2475470decc6SDave Kleikamp new_jh = journal_alloc_journal_head(); 2476470decc6SDave Kleikamp 2477470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2478470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2479470decc6SDave Kleikamp jh = bh2jh(bh); 2480470decc6SDave Kleikamp } else { 2481470decc6SDave Kleikamp J_ASSERT_BH(bh, 2482470decc6SDave Kleikamp (atomic_read(&bh->b_count) > 0) || 2483470decc6SDave Kleikamp (bh->b_page && bh->b_page->mapping)); 2484470decc6SDave Kleikamp 2485470decc6SDave Kleikamp if (!new_jh) { 2486470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2487470decc6SDave Kleikamp goto repeat; 2488470decc6SDave Kleikamp } 2489470decc6SDave Kleikamp 2490470decc6SDave Kleikamp jh = new_jh; 2491470decc6SDave Kleikamp new_jh = NULL; /* We consumed it */ 2492470decc6SDave Kleikamp set_buffer_jbd(bh); 2493470decc6SDave Kleikamp bh->b_private = jh; 2494470decc6SDave Kleikamp jh->b_bh = bh; 2495470decc6SDave Kleikamp get_bh(bh); 2496470decc6SDave Kleikamp BUFFER_TRACE(bh, "added journal_head"); 2497470decc6SDave Kleikamp } 2498470decc6SDave Kleikamp jh->b_jcount++; 2499470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2500470decc6SDave Kleikamp if (new_jh) 2501470decc6SDave Kleikamp journal_free_journal_head(new_jh); 2502470decc6SDave Kleikamp return bh->b_private; 2503470decc6SDave Kleikamp } 2504470decc6SDave Kleikamp 2505470decc6SDave Kleikamp /* 2506470decc6SDave Kleikamp * Grab a ref against this buffer_head's journal_head. If it ended up not 2507470decc6SDave Kleikamp * having a journal_head, return NULL 2508470decc6SDave Kleikamp */ 2509f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) 2510470decc6SDave Kleikamp { 2511470decc6SDave Kleikamp struct journal_head *jh = NULL; 2512470decc6SDave Kleikamp 2513470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2514470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2515470decc6SDave Kleikamp jh = bh2jh(bh); 2516470decc6SDave Kleikamp jh->b_jcount++; 2517470decc6SDave Kleikamp } 2518470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2519470decc6SDave Kleikamp return jh; 2520470decc6SDave Kleikamp } 2521470decc6SDave Kleikamp 2522470decc6SDave Kleikamp static void __journal_remove_journal_head(struct buffer_head *bh) 2523470decc6SDave Kleikamp { 2524470decc6SDave Kleikamp struct journal_head *jh = bh2jh(bh); 2525470decc6SDave Kleikamp 2526470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount >= 0); 2527de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_transaction == NULL); 2528de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_next_transaction == NULL); 2529de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); 2530470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jlist == BJ_None); 2531470decc6SDave Kleikamp J_ASSERT_BH(bh, buffer_jbd(bh)); 2532470decc6SDave Kleikamp J_ASSERT_BH(bh, jh2bh(jh) == bh); 2533470decc6SDave Kleikamp BUFFER_TRACE(bh, "remove journal_head"); 25347855a57dSThomas Gleixner 25357855a57dSThomas Gleixner /* Unlink before dropping the lock */ 2536470decc6SDave Kleikamp bh->b_private = NULL; 2537470decc6SDave Kleikamp jh->b_bh = NULL; /* debug, really */ 2538470decc6SDave Kleikamp clear_buffer_jbd(bh); 25397855a57dSThomas Gleixner } 25407855a57dSThomas Gleixner 25417855a57dSThomas Gleixner static void journal_release_journal_head(struct journal_head *jh, size_t b_size) 25427855a57dSThomas Gleixner { 25437855a57dSThomas Gleixner if (jh->b_frozen_data) { 25447855a57dSThomas Gleixner printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__); 25457855a57dSThomas Gleixner jbd2_free(jh->b_frozen_data, b_size); 25467855a57dSThomas Gleixner } 25477855a57dSThomas Gleixner if (jh->b_committed_data) { 25487855a57dSThomas Gleixner printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__); 25497855a57dSThomas Gleixner jbd2_free(jh->b_committed_data, b_size); 25507855a57dSThomas Gleixner } 2551470decc6SDave Kleikamp journal_free_journal_head(jh); 2552470decc6SDave Kleikamp } 2553470decc6SDave Kleikamp 2554470decc6SDave Kleikamp /* 2555de1b7941SJan Kara * Drop a reference on the passed journal_head. If it fell to zero then 2556470decc6SDave Kleikamp * release the journal_head from the buffer_head. 2557470decc6SDave Kleikamp */ 2558f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh) 2559470decc6SDave Kleikamp { 2560470decc6SDave Kleikamp struct buffer_head *bh = jh2bh(jh); 2561470decc6SDave Kleikamp 2562470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2563470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount > 0); 2564470decc6SDave Kleikamp --jh->b_jcount; 2565de1b7941SJan Kara if (!jh->b_jcount) { 2566470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2567de1b7941SJan Kara jbd_unlock_bh_journal_head(bh); 25687855a57dSThomas Gleixner journal_release_journal_head(jh, bh->b_size); 2569470decc6SDave Kleikamp __brelse(bh); 25707855a57dSThomas Gleixner } else { 2571470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2572470decc6SDave Kleikamp } 25737855a57dSThomas Gleixner } 2574470decc6SDave Kleikamp 2575470decc6SDave Kleikamp /* 2576c851ed54SJan Kara * Initialize jbd inode head 2577c851ed54SJan Kara */ 2578c851ed54SJan Kara void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) 2579c851ed54SJan Kara { 2580c851ed54SJan Kara jinode->i_transaction = NULL; 2581c851ed54SJan Kara jinode->i_next_transaction = NULL; 2582c851ed54SJan Kara jinode->i_vfs_inode = inode; 2583c851ed54SJan Kara jinode->i_flags = 0; 25846ba0e7dcSRoss Zwisler jinode->i_dirty_start = 0; 25856ba0e7dcSRoss Zwisler jinode->i_dirty_end = 0; 2586c851ed54SJan Kara INIT_LIST_HEAD(&jinode->i_list); 2587c851ed54SJan Kara } 2588c851ed54SJan Kara 2589c851ed54SJan Kara /* 2590c851ed54SJan Kara * Function to be called before we start removing inode from memory (i.e., 2591c851ed54SJan Kara * clear_inode() is a fine place to be called from). It removes inode from 2592c851ed54SJan Kara * transaction's lists. 2593c851ed54SJan Kara */ 2594c851ed54SJan Kara void jbd2_journal_release_jbd_inode(journal_t *journal, 2595c851ed54SJan Kara struct jbd2_inode *jinode) 2596c851ed54SJan Kara { 2597c851ed54SJan Kara if (!journal) 2598c851ed54SJan Kara return; 2599c851ed54SJan Kara restart: 2600c851ed54SJan Kara spin_lock(&journal->j_list_lock); 2601c851ed54SJan Kara /* Is commit writing out inode - we have to wait */ 2602cb0d9d47SJan Kara if (jinode->i_flags & JI_COMMIT_RUNNING) { 2603c851ed54SJan Kara wait_queue_head_t *wq; 2604c851ed54SJan Kara DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); 2605c851ed54SJan Kara wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); 260621417136SIngo Molnar prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE); 2607c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2608c851ed54SJan Kara schedule(); 260921417136SIngo Molnar finish_wait(wq, &wait.wq_entry); 2610c851ed54SJan Kara goto restart; 2611c851ed54SJan Kara } 2612c851ed54SJan Kara 2613c851ed54SJan Kara if (jinode->i_transaction) { 2614c851ed54SJan Kara list_del(&jinode->i_list); 2615c851ed54SJan Kara jinode->i_transaction = NULL; 2616c851ed54SJan Kara } 2617c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2618c851ed54SJan Kara } 2619c851ed54SJan Kara 2620470decc6SDave Kleikamp 26218e85fb3fSJohann Lombardi #ifdef CONFIG_PROC_FS 26228e85fb3fSJohann Lombardi 26238e85fb3fSJohann Lombardi #define JBD2_STATS_PROC_NAME "fs/jbd2" 26248e85fb3fSJohann Lombardi 26258e85fb3fSJohann Lombardi static void __init jbd2_create_jbd_stats_proc_entry(void) 26268e85fb3fSJohann Lombardi { 26278e85fb3fSJohann Lombardi proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); 26288e85fb3fSJohann Lombardi } 26298e85fb3fSJohann Lombardi 26308e85fb3fSJohann Lombardi static void __exit jbd2_remove_jbd_stats_proc_entry(void) 26318e85fb3fSJohann Lombardi { 26328e85fb3fSJohann Lombardi if (proc_jbd2_stats) 26338e85fb3fSJohann Lombardi remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); 26348e85fb3fSJohann Lombardi } 26358e85fb3fSJohann Lombardi 26368e85fb3fSJohann Lombardi #else 26378e85fb3fSJohann Lombardi 26388e85fb3fSJohann Lombardi #define jbd2_create_jbd_stats_proc_entry() do {} while (0) 26398e85fb3fSJohann Lombardi #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) 26408e85fb3fSJohann Lombardi 26418e85fb3fSJohann Lombardi #endif 26428e85fb3fSJohann Lombardi 26438aefcd55STheodore Ts'o struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; 2644470decc6SDave Kleikamp 26450d52154bSChengguang Xu static int __init jbd2_journal_init_inode_cache(void) 2646470decc6SDave Kleikamp { 26470d52154bSChengguang Xu J_ASSERT(!jbd2_inode_cache); 26488aefcd55STheodore Ts'o jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); 26490d52154bSChengguang Xu if (!jbd2_inode_cache) { 26500d52154bSChengguang Xu pr_emerg("JBD2: failed to create inode cache\n"); 2651470decc6SDave Kleikamp return -ENOMEM; 2652470decc6SDave Kleikamp } 2653470decc6SDave Kleikamp return 0; 2654470decc6SDave Kleikamp } 2655470decc6SDave Kleikamp 26560d52154bSChengguang Xu static int __init jbd2_journal_init_handle_cache(void) 26570d52154bSChengguang Xu { 26580d52154bSChengguang Xu J_ASSERT(!jbd2_handle_cache); 26590d52154bSChengguang Xu jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); 26600d52154bSChengguang Xu if (!jbd2_handle_cache) { 26610d52154bSChengguang Xu printk(KERN_EMERG "JBD2: failed to create handle cache\n"); 26620d52154bSChengguang Xu return -ENOMEM; 26630d52154bSChengguang Xu } 26640d52154bSChengguang Xu return 0; 26650d52154bSChengguang Xu } 26660d52154bSChengguang Xu 26670d52154bSChengguang Xu static void jbd2_journal_destroy_inode_cache(void) 26680d52154bSChengguang Xu { 26690d52154bSChengguang Xu kmem_cache_destroy(jbd2_inode_cache); 26700d52154bSChengguang Xu jbd2_inode_cache = NULL; 26710d52154bSChengguang Xu } 26720d52154bSChengguang Xu 2673f7f4bccbSMingming Cao static void jbd2_journal_destroy_handle_cache(void) 2674470decc6SDave Kleikamp { 2675f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_handle_cache); 26768bdd5b60SWang Long jbd2_handle_cache = NULL; 2677470decc6SDave Kleikamp } 2678470decc6SDave Kleikamp 2679470decc6SDave Kleikamp /* 2680470decc6SDave Kleikamp * Module startup and shutdown 2681470decc6SDave Kleikamp */ 2682470decc6SDave Kleikamp 2683470decc6SDave Kleikamp static int __init journal_init_caches(void) 2684470decc6SDave Kleikamp { 2685470decc6SDave Kleikamp int ret; 2686470decc6SDave Kleikamp 26870d52154bSChengguang Xu ret = jbd2_journal_init_revoke_record_cache(); 26880d52154bSChengguang Xu if (ret == 0) 26890d52154bSChengguang Xu ret = jbd2_journal_init_revoke_table_cache(); 2690470decc6SDave Kleikamp if (ret == 0) 26914185a2acSYongqiang Yang ret = jbd2_journal_init_journal_head_cache(); 2692470decc6SDave Kleikamp if (ret == 0) 26934185a2acSYongqiang Yang ret = jbd2_journal_init_handle_cache(); 26940c2022ecSYongqiang Yang if (ret == 0) 26950d52154bSChengguang Xu ret = jbd2_journal_init_inode_cache(); 26960d52154bSChengguang Xu if (ret == 0) 26970c2022ecSYongqiang Yang ret = jbd2_journal_init_transaction_cache(); 2698470decc6SDave Kleikamp return ret; 2699470decc6SDave Kleikamp } 2700470decc6SDave Kleikamp 2701f7f4bccbSMingming Cao static void jbd2_journal_destroy_caches(void) 2702470decc6SDave Kleikamp { 27030d52154bSChengguang Xu jbd2_journal_destroy_revoke_record_cache(); 27040d52154bSChengguang Xu jbd2_journal_destroy_revoke_table_cache(); 27054185a2acSYongqiang Yang jbd2_journal_destroy_journal_head_cache(); 2706f7f4bccbSMingming Cao jbd2_journal_destroy_handle_cache(); 27070d52154bSChengguang Xu jbd2_journal_destroy_inode_cache(); 27080c2022ecSYongqiang Yang jbd2_journal_destroy_transaction_cache(); 2709d2eecb03STheodore Ts'o jbd2_journal_destroy_slabs(); 2710470decc6SDave Kleikamp } 2711470decc6SDave Kleikamp 2712470decc6SDave Kleikamp static int __init journal_init(void) 2713470decc6SDave Kleikamp { 2714470decc6SDave Kleikamp int ret; 2715470decc6SDave Kleikamp 2716470decc6SDave Kleikamp BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); 2717470decc6SDave Kleikamp 2718470decc6SDave Kleikamp ret = journal_init_caches(); 2719620de4e1SDuane Griffin if (ret == 0) { 27208e85fb3fSJohann Lombardi jbd2_create_jbd_stats_proc_entry(); 2721620de4e1SDuane Griffin } else { 2722620de4e1SDuane Griffin jbd2_journal_destroy_caches(); 2723620de4e1SDuane Griffin } 2724470decc6SDave Kleikamp return ret; 2725470decc6SDave Kleikamp } 2726470decc6SDave Kleikamp 2727470decc6SDave Kleikamp static void __exit journal_exit(void) 2728470decc6SDave Kleikamp { 2729e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2730470decc6SDave Kleikamp int n = atomic_read(&nr_journal_heads); 2731470decc6SDave Kleikamp if (n) 273275685071SJan Kara printk(KERN_ERR "JBD2: leaked %d journal_heads!\n", n); 2733470decc6SDave Kleikamp #endif 27348e85fb3fSJohann Lombardi jbd2_remove_jbd_stats_proc_entry(); 2735f7f4bccbSMingming Cao jbd2_journal_destroy_caches(); 2736470decc6SDave Kleikamp } 2737470decc6SDave Kleikamp 2738470decc6SDave Kleikamp MODULE_LICENSE("GPL"); 2739470decc6SDave Kleikamp module_init(journal_init); 2740470decc6SDave Kleikamp module_exit(journal_exit); 2741470decc6SDave Kleikamp 2742