1470decc6SDave Kleikamp /* 2f7f4bccbSMingming Cao * linux/fs/jbd2/journal.c 3470decc6SDave Kleikamp * 4470decc6SDave Kleikamp * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 5470decc6SDave Kleikamp * 6470decc6SDave Kleikamp * Copyright 1998 Red Hat corp --- All Rights Reserved 7470decc6SDave Kleikamp * 8470decc6SDave Kleikamp * This file is part of the Linux kernel and is made available under 9470decc6SDave Kleikamp * the terms of the GNU General Public License, version 2, or at your 10470decc6SDave Kleikamp * option, any later version, incorporated herein by reference. 11470decc6SDave Kleikamp * 12470decc6SDave Kleikamp * Generic filesystem journal-writing code; part of the ext2fs 13470decc6SDave Kleikamp * journaling system. 14470decc6SDave Kleikamp * 15470decc6SDave Kleikamp * This file manages journals: areas of disk reserved for logging 16470decc6SDave Kleikamp * transactional updates. This includes the kernel journaling thread 17470decc6SDave Kleikamp * which is responsible for scheduling updates to the log. 18470decc6SDave Kleikamp * 19470decc6SDave Kleikamp * We do not actually manage the physical storage of the journal in this 20470decc6SDave Kleikamp * file: that is left to a per-journal policy function, which allows us 21470decc6SDave Kleikamp * to store the journal within a filesystem-specified area for ext2 22470decc6SDave Kleikamp * journaling (ext2 can use a reserved inode for storing the log). 23470decc6SDave Kleikamp */ 24470decc6SDave Kleikamp 25470decc6SDave Kleikamp #include <linux/module.h> 26470decc6SDave Kleikamp #include <linux/time.h> 27470decc6SDave Kleikamp #include <linux/fs.h> 28f7f4bccbSMingming Cao #include <linux/jbd2.h> 29470decc6SDave Kleikamp #include <linux/errno.h> 30470decc6SDave Kleikamp #include <linux/slab.h> 31470decc6SDave Kleikamp #include <linux/init.h> 32470decc6SDave Kleikamp #include <linux/mm.h> 337dfb7103SNigel Cunningham #include <linux/freezer.h> 34470decc6SDave Kleikamp #include <linux/pagemap.h> 35470decc6SDave Kleikamp #include <linux/kthread.h> 36470decc6SDave Kleikamp #include <linux/poison.h> 37470decc6SDave Kleikamp #include <linux/proc_fs.h> 388e85fb3fSJohann Lombardi #include <linux/seq_file.h> 39c225aa57SSimon Holm Thøgersen #include <linux/math64.h> 40879c5e6bSTheodore Ts'o #include <linux/hash.h> 41d2eecb03STheodore Ts'o #include <linux/log2.h> 42d2eecb03STheodore Ts'o #include <linux/vmalloc.h> 4347def826STheodore Ts'o #include <linux/backing-dev.h> 4439e3ac25SBrian King #include <linux/bitops.h> 45670be5a7STheodore Ts'o #include <linux/ratelimit.h> 46879c5e6bSTheodore Ts'o 47879c5e6bSTheodore Ts'o #define CREATE_TRACE_POINTS 48879c5e6bSTheodore Ts'o #include <trace/events/jbd2.h> 49470decc6SDave Kleikamp 50470decc6SDave Kleikamp #include <asm/uaccess.h> 51470decc6SDave Kleikamp #include <asm/page.h> 52470decc6SDave Kleikamp 53b6e96d00STheodore Ts'o #ifdef CONFIG_JBD2_DEBUG 54b6e96d00STheodore Ts'o ushort jbd2_journal_enable_debug __read_mostly; 55b6e96d00STheodore Ts'o EXPORT_SYMBOL(jbd2_journal_enable_debug); 56b6e96d00STheodore Ts'o 57b6e96d00STheodore Ts'o module_param_named(jbd2_debug, jbd2_journal_enable_debug, ushort, 0644); 58b6e96d00STheodore Ts'o MODULE_PARM_DESC(jbd2_debug, "Debugging level for jbd2"); 59b6e96d00STheodore Ts'o #endif 60b6e96d00STheodore Ts'o 61f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_extend); 62f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_stop); 63f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_lock_updates); 64f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_unlock_updates); 65f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_write_access); 66f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_create_access); 67f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_get_undo_access); 68e06c8227SJoel Becker EXPORT_SYMBOL(jbd2_journal_set_triggers); 69f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_dirty_metadata); 70f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_forget); 71470decc6SDave Kleikamp #if 0 72470decc6SDave Kleikamp EXPORT_SYMBOL(journal_sync_buffer); 73470decc6SDave Kleikamp #endif 74f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_flush); 75f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_revoke); 76470decc6SDave Kleikamp 77f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_init_dev); 78f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_init_inode); 79f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_check_used_features); 80f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_check_available_features); 81f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_set_features); 82f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_load); 83f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_destroy); 84f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_abort); 85f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_errno); 86f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_ack_err); 87f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_clear_err); 88f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_log_wait_commit); 893b799d15STheodore Ts'o EXPORT_SYMBOL(jbd2_log_start_commit); 90f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_start_commit); 91f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_force_commit_nested); 92f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_wipe); 93f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_blocks_per_page); 94f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_invalidatepage); 95f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers); 96f7f4bccbSMingming Cao EXPORT_SYMBOL(jbd2_journal_force_commit); 97c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_file_inode); 98c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); 99c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); 100c851ed54SJan Kara EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); 1018aefcd55STheodore Ts'o EXPORT_SYMBOL(jbd2_inode_cache); 102470decc6SDave Kleikamp 103470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno); 104d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t slab_size); 105470decc6SDave Kleikamp 10625ed6e8aSDarrick J. Wong /* Checksumming functions */ 10725ed6e8aSDarrick J. Wong int jbd2_verify_csum_type(journal_t *j, journal_superblock_t *sb) 10825ed6e8aSDarrick J. Wong { 10925ed6e8aSDarrick J. Wong if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) 11025ed6e8aSDarrick J. Wong return 1; 11125ed6e8aSDarrick J. Wong 11225ed6e8aSDarrick J. Wong return sb->s_checksum_type == JBD2_CRC32C_CHKSUM; 11325ed6e8aSDarrick J. Wong } 11425ed6e8aSDarrick J. Wong 1154fd5ea43SDarrick J. Wong static __u32 jbd2_superblock_csum(journal_t *j, journal_superblock_t *sb) 1164fd5ea43SDarrick J. Wong { 1174fd5ea43SDarrick J. Wong __u32 csum, old_csum; 1184fd5ea43SDarrick J. Wong 1194fd5ea43SDarrick J. Wong old_csum = sb->s_checksum; 1204fd5ea43SDarrick J. Wong sb->s_checksum = 0; 1214fd5ea43SDarrick J. Wong csum = jbd2_chksum(j, ~0, (char *)sb, sizeof(journal_superblock_t)); 1224fd5ea43SDarrick J. Wong sb->s_checksum = old_csum; 1234fd5ea43SDarrick J. Wong 1244fd5ea43SDarrick J. Wong return cpu_to_be32(csum); 1254fd5ea43SDarrick J. Wong } 1264fd5ea43SDarrick J. Wong 1274fd5ea43SDarrick J. Wong int jbd2_superblock_csum_verify(journal_t *j, journal_superblock_t *sb) 1284fd5ea43SDarrick J. Wong { 1294fd5ea43SDarrick J. Wong if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) 1304fd5ea43SDarrick J. Wong return 1; 1314fd5ea43SDarrick J. Wong 1324fd5ea43SDarrick J. Wong return sb->s_checksum == jbd2_superblock_csum(j, sb); 1334fd5ea43SDarrick J. Wong } 1344fd5ea43SDarrick J. Wong 1354fd5ea43SDarrick J. Wong void jbd2_superblock_csum_set(journal_t *j, journal_superblock_t *sb) 1364fd5ea43SDarrick J. Wong { 1374fd5ea43SDarrick J. Wong if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2)) 1384fd5ea43SDarrick J. Wong return; 1394fd5ea43SDarrick J. Wong 1404fd5ea43SDarrick J. Wong sb->s_checksum = jbd2_superblock_csum(j, sb); 1414fd5ea43SDarrick J. Wong } 1424fd5ea43SDarrick J. Wong 143470decc6SDave Kleikamp /* 144470decc6SDave Kleikamp * Helper function used to manage commit timeouts 145470decc6SDave Kleikamp */ 146470decc6SDave Kleikamp 147470decc6SDave Kleikamp static void commit_timeout(unsigned long __data) 148470decc6SDave Kleikamp { 149470decc6SDave Kleikamp struct task_struct * p = (struct task_struct *) __data; 150470decc6SDave Kleikamp 151470decc6SDave Kleikamp wake_up_process(p); 152470decc6SDave Kleikamp } 153470decc6SDave Kleikamp 154470decc6SDave Kleikamp /* 155f7f4bccbSMingming Cao * kjournald2: The main thread function used to manage a logging device 156470decc6SDave Kleikamp * journal. 157470decc6SDave Kleikamp * 158470decc6SDave Kleikamp * This kernel thread is responsible for two things: 159470decc6SDave Kleikamp * 160470decc6SDave Kleikamp * 1) COMMIT: Every so often we need to commit the current state of the 161470decc6SDave Kleikamp * filesystem to disk. The journal thread is responsible for writing 162470decc6SDave Kleikamp * all of the metadata buffers to disk. 163470decc6SDave Kleikamp * 164470decc6SDave Kleikamp * 2) CHECKPOINT: We cannot reuse a used section of the log file until all 165470decc6SDave Kleikamp * of the data in that part of the log has been rewritten elsewhere on 166470decc6SDave Kleikamp * the disk. Flushing these old buffers to reclaim space in the log is 167470decc6SDave Kleikamp * known as checkpointing, and this thread is responsible for that job. 168470decc6SDave Kleikamp */ 169470decc6SDave Kleikamp 170f7f4bccbSMingming Cao static int kjournald2(void *arg) 171470decc6SDave Kleikamp { 172470decc6SDave Kleikamp journal_t *journal = arg; 173470decc6SDave Kleikamp transaction_t *transaction; 174470decc6SDave Kleikamp 175470decc6SDave Kleikamp /* 176470decc6SDave Kleikamp * Set up an interval timer which can be used to trigger a commit wakeup 177470decc6SDave Kleikamp * after the commit interval expires 178470decc6SDave Kleikamp */ 179470decc6SDave Kleikamp setup_timer(&journal->j_commit_timer, commit_timeout, 180470decc6SDave Kleikamp (unsigned long)current); 181470decc6SDave Kleikamp 18235c80422SNigel Cunningham set_freezable(); 18335c80422SNigel Cunningham 184470decc6SDave Kleikamp /* Record that the journal thread is running */ 185470decc6SDave Kleikamp journal->j_task = current; 186470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 187470decc6SDave Kleikamp 188470decc6SDave Kleikamp /* 189470decc6SDave Kleikamp * And now, wait forever for commit wakeup events. 190470decc6SDave Kleikamp */ 191a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 192470decc6SDave Kleikamp 193470decc6SDave Kleikamp loop: 194f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 195470decc6SDave Kleikamp goto end_loop; 196470decc6SDave Kleikamp 197470decc6SDave Kleikamp jbd_debug(1, "commit_sequence=%d, commit_request=%d\n", 198470decc6SDave Kleikamp journal->j_commit_sequence, journal->j_commit_request); 199470decc6SDave Kleikamp 200470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) { 201470decc6SDave Kleikamp jbd_debug(1, "OK, requests differ\n"); 202a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 203470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 204f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 205a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 206470decc6SDave Kleikamp goto loop; 207470decc6SDave Kleikamp } 208470decc6SDave Kleikamp 209470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 210470decc6SDave Kleikamp if (freezing(current)) { 211470decc6SDave Kleikamp /* 212470decc6SDave Kleikamp * The simpler the better. Flushing journal isn't a 213470decc6SDave Kleikamp * good idea, because that depends on threads that may 214470decc6SDave Kleikamp * be already stopped. 215470decc6SDave Kleikamp */ 216f7f4bccbSMingming Cao jbd_debug(1, "Now suspending kjournald2\n"); 217a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 218a0acae0eSTejun Heo try_to_freeze(); 219a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 220470decc6SDave Kleikamp } else { 221470decc6SDave Kleikamp /* 222470decc6SDave Kleikamp * We assume on resume that commits are already there, 223470decc6SDave Kleikamp * so we don't sleep 224470decc6SDave Kleikamp */ 225470decc6SDave Kleikamp DEFINE_WAIT(wait); 226470decc6SDave Kleikamp int should_sleep = 1; 227470decc6SDave Kleikamp 228470decc6SDave Kleikamp prepare_to_wait(&journal->j_wait_commit, &wait, 229470decc6SDave Kleikamp TASK_INTERRUPTIBLE); 230470decc6SDave Kleikamp if (journal->j_commit_sequence != journal->j_commit_request) 231470decc6SDave Kleikamp should_sleep = 0; 232470decc6SDave Kleikamp transaction = journal->j_running_transaction; 233470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, 234470decc6SDave Kleikamp transaction->t_expires)) 235470decc6SDave Kleikamp should_sleep = 0; 236f7f4bccbSMingming Cao if (journal->j_flags & JBD2_UNMOUNT) 237470decc6SDave Kleikamp should_sleep = 0; 238470decc6SDave Kleikamp if (should_sleep) { 239a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 240470decc6SDave Kleikamp schedule(); 241a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 242470decc6SDave Kleikamp } 243470decc6SDave Kleikamp finish_wait(&journal->j_wait_commit, &wait); 244470decc6SDave Kleikamp } 245470decc6SDave Kleikamp 246f7f4bccbSMingming Cao jbd_debug(1, "kjournald2 wakes\n"); 247470decc6SDave Kleikamp 248470decc6SDave Kleikamp /* 249470decc6SDave Kleikamp * Were we woken up by a commit wakeup event? 250470decc6SDave Kleikamp */ 251470decc6SDave Kleikamp transaction = journal->j_running_transaction; 252470decc6SDave Kleikamp if (transaction && time_after_eq(jiffies, transaction->t_expires)) { 253470decc6SDave Kleikamp journal->j_commit_request = transaction->t_tid; 254470decc6SDave Kleikamp jbd_debug(1, "woke because of timeout\n"); 255470decc6SDave Kleikamp } 256470decc6SDave Kleikamp goto loop; 257470decc6SDave Kleikamp 258470decc6SDave Kleikamp end_loop: 259a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 260470decc6SDave Kleikamp del_timer_sync(&journal->j_commit_timer); 261470decc6SDave Kleikamp journal->j_task = NULL; 262470decc6SDave Kleikamp wake_up(&journal->j_wait_done_commit); 263470decc6SDave Kleikamp jbd_debug(1, "Journal thread exiting.\n"); 264470decc6SDave Kleikamp return 0; 265470decc6SDave Kleikamp } 266470decc6SDave Kleikamp 26797f06784SPavel Emelianov static int jbd2_journal_start_thread(journal_t *journal) 268470decc6SDave Kleikamp { 26997f06784SPavel Emelianov struct task_struct *t; 27097f06784SPavel Emelianov 27190576c0bSTheodore Ts'o t = kthread_run(kjournald2, journal, "jbd2/%s", 27290576c0bSTheodore Ts'o journal->j_devname); 27397f06784SPavel Emelianov if (IS_ERR(t)) 27497f06784SPavel Emelianov return PTR_ERR(t); 27597f06784SPavel Emelianov 2761076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task != NULL); 27797f06784SPavel Emelianov return 0; 278470decc6SDave Kleikamp } 279470decc6SDave Kleikamp 280470decc6SDave Kleikamp static void journal_kill_thread(journal_t *journal) 281470decc6SDave Kleikamp { 282a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 283f7f4bccbSMingming Cao journal->j_flags |= JBD2_UNMOUNT; 284470decc6SDave Kleikamp 285470decc6SDave Kleikamp while (journal->j_task) { 286470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 287a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2881076d17aSAl Viro wait_event(journal->j_wait_done_commit, journal->j_task == NULL); 289a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 290470decc6SDave Kleikamp } 291a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 292470decc6SDave Kleikamp } 293470decc6SDave Kleikamp 294470decc6SDave Kleikamp /* 295f7f4bccbSMingming Cao * jbd2_journal_write_metadata_buffer: write a metadata buffer to the journal. 296470decc6SDave Kleikamp * 297470decc6SDave Kleikamp * Writes a metadata buffer to a given disk block. The actual IO is not 298470decc6SDave Kleikamp * performed but a new buffer_head is constructed which labels the data 299470decc6SDave Kleikamp * to be written with the correct destination disk block. 300470decc6SDave Kleikamp * 301470decc6SDave Kleikamp * Any magic-number escaping which needs to be done will cause a 302470decc6SDave Kleikamp * copy-out here. If the buffer happens to start with the 303f7f4bccbSMingming Cao * JBD2_MAGIC_NUMBER, then we can't write it to the log directly: the 304470decc6SDave Kleikamp * magic number is only written to the log for descripter blocks. In 305470decc6SDave Kleikamp * this case, we copy the data and replace the first word with 0, and we 306470decc6SDave Kleikamp * return a result code which indicates that this buffer needs to be 307470decc6SDave Kleikamp * marked as an escaped buffer in the corresponding log descriptor 308470decc6SDave Kleikamp * block. The missing word can then be restored when the block is read 309470decc6SDave Kleikamp * during recovery. 310470decc6SDave Kleikamp * 311470decc6SDave Kleikamp * If the source buffer has already been modified by a new transaction 312470decc6SDave Kleikamp * since we took the last commit snapshot, we use the frozen copy of 313470decc6SDave Kleikamp * that data for IO. If we end up using the existing buffer_head's data 314f5113effSJan Kara * for the write, then we have to make sure nobody modifies it while the 315f5113effSJan Kara * IO is in progress. do_get_write_access() handles this. 316470decc6SDave Kleikamp * 317f5113effSJan Kara * The function returns a pointer to the buffer_head to be used for IO. 318470decc6SDave Kleikamp * 319470decc6SDave Kleikamp * 320470decc6SDave Kleikamp * Return value: 321470decc6SDave Kleikamp * <0: Error 322470decc6SDave Kleikamp * >=0: Finished OK 323470decc6SDave Kleikamp * 324470decc6SDave Kleikamp * On success: 325470decc6SDave Kleikamp * Bit 0 set == escape performed on the data 326470decc6SDave Kleikamp * Bit 1 set == buffer copy-out performed (kfree the data after IO) 327470decc6SDave Kleikamp */ 328470decc6SDave Kleikamp 329f7f4bccbSMingming Cao int jbd2_journal_write_metadata_buffer(transaction_t *transaction, 330470decc6SDave Kleikamp struct journal_head *jh_in, 331f5113effSJan Kara struct buffer_head **bh_out, 332f5113effSJan Kara sector_t blocknr) 333470decc6SDave Kleikamp { 334470decc6SDave Kleikamp int need_copy_out = 0; 335470decc6SDave Kleikamp int done_copy_out = 0; 336470decc6SDave Kleikamp int do_escape = 0; 337470decc6SDave Kleikamp char *mapped_data; 338470decc6SDave Kleikamp struct buffer_head *new_bh; 339470decc6SDave Kleikamp struct page *new_page; 340470decc6SDave Kleikamp unsigned int new_offset; 341470decc6SDave Kleikamp struct buffer_head *bh_in = jh2bh(jh_in); 34296577c43Sdingdinghua journal_t *journal = transaction->t_journal; 343470decc6SDave Kleikamp 344470decc6SDave Kleikamp /* 345470decc6SDave Kleikamp * The buffer really shouldn't be locked: only the current committing 346470decc6SDave Kleikamp * transaction is allowed to write it, so nobody else is allowed 347470decc6SDave Kleikamp * to do any IO. 348470decc6SDave Kleikamp * 349470decc6SDave Kleikamp * akpm: except if we're journalling data, and write() output is 350470decc6SDave Kleikamp * also part of a shared mapping, and another thread has 351470decc6SDave Kleikamp * decided to launch a writepage() against this buffer. 352470decc6SDave Kleikamp */ 353470decc6SDave Kleikamp J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in)); 354470decc6SDave Kleikamp 35547def826STheodore Ts'o retry_alloc: 35647def826STheodore Ts'o new_bh = alloc_buffer_head(GFP_NOFS); 35747def826STheodore Ts'o if (!new_bh) { 35847def826STheodore Ts'o /* 35947def826STheodore Ts'o * Failure is not an option, but __GFP_NOFAIL is going 36047def826STheodore Ts'o * away; so we retry ourselves here. 36147def826STheodore Ts'o */ 36247def826STheodore Ts'o congestion_wait(BLK_RW_ASYNC, HZ/50); 36347def826STheodore Ts'o goto retry_alloc; 36447def826STheodore Ts'o } 36547def826STheodore Ts'o 36696577c43Sdingdinghua /* keep subsequent assertions sane */ 36796577c43Sdingdinghua atomic_set(&new_bh->b_count, 1); 368470decc6SDave Kleikamp 369f5113effSJan Kara jbd_lock_bh_state(bh_in); 370f5113effSJan Kara repeat: 371470decc6SDave Kleikamp /* 372470decc6SDave Kleikamp * If a new transaction has already done a buffer copy-out, then 373470decc6SDave Kleikamp * we use that version of the data for the commit. 374470decc6SDave Kleikamp */ 375470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 376470decc6SDave Kleikamp done_copy_out = 1; 377470decc6SDave Kleikamp new_page = virt_to_page(jh_in->b_frozen_data); 378470decc6SDave Kleikamp new_offset = offset_in_page(jh_in->b_frozen_data); 379470decc6SDave Kleikamp } else { 380470decc6SDave Kleikamp new_page = jh2bh(jh_in)->b_page; 381470decc6SDave Kleikamp new_offset = offset_in_page(jh2bh(jh_in)->b_data); 382470decc6SDave Kleikamp } 383470decc6SDave Kleikamp 384303a8f2aSCong Wang mapped_data = kmap_atomic(new_page); 385470decc6SDave Kleikamp /* 38613ceef09SJan Kara * Fire data frozen trigger if data already wasn't frozen. Do this 38713ceef09SJan Kara * before checking for escaping, as the trigger may modify the magic 38813ceef09SJan Kara * offset. If a copy-out happens afterwards, it will have the correct 38913ceef09SJan Kara * data in the buffer. 390e06c8227SJoel Becker */ 39113ceef09SJan Kara if (!done_copy_out) 39213ceef09SJan Kara jbd2_buffer_frozen_trigger(jh_in, mapped_data + new_offset, 39313ceef09SJan Kara jh_in->b_triggers); 394e06c8227SJoel Becker 395e06c8227SJoel Becker /* 396470decc6SDave Kleikamp * Check for escaping 397470decc6SDave Kleikamp */ 398470decc6SDave Kleikamp if (*((__be32 *)(mapped_data + new_offset)) == 399f7f4bccbSMingming Cao cpu_to_be32(JBD2_MAGIC_NUMBER)) { 400470decc6SDave Kleikamp need_copy_out = 1; 401470decc6SDave Kleikamp do_escape = 1; 402470decc6SDave Kleikamp } 403303a8f2aSCong Wang kunmap_atomic(mapped_data); 404470decc6SDave Kleikamp 405470decc6SDave Kleikamp /* 406470decc6SDave Kleikamp * Do we need to do a data copy? 407470decc6SDave Kleikamp */ 408470decc6SDave Kleikamp if (need_copy_out && !done_copy_out) { 409470decc6SDave Kleikamp char *tmp; 410470decc6SDave Kleikamp 411470decc6SDave Kleikamp jbd_unlock_bh_state(bh_in); 412af1e76d6SMingming Cao tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS); 413e6ec116bSTheodore Ts'o if (!tmp) { 414f5113effSJan Kara brelse(new_bh); 415e6ec116bSTheodore Ts'o return -ENOMEM; 416e6ec116bSTheodore Ts'o } 417470decc6SDave Kleikamp jbd_lock_bh_state(bh_in); 418470decc6SDave Kleikamp if (jh_in->b_frozen_data) { 419af1e76d6SMingming Cao jbd2_free(tmp, bh_in->b_size); 420470decc6SDave Kleikamp goto repeat; 421470decc6SDave Kleikamp } 422470decc6SDave Kleikamp 423470decc6SDave Kleikamp jh_in->b_frozen_data = tmp; 424303a8f2aSCong Wang mapped_data = kmap_atomic(new_page); 425f5113effSJan Kara memcpy(tmp, mapped_data + new_offset, bh_in->b_size); 426303a8f2aSCong Wang kunmap_atomic(mapped_data); 427470decc6SDave Kleikamp 428470decc6SDave Kleikamp new_page = virt_to_page(tmp); 429470decc6SDave Kleikamp new_offset = offset_in_page(tmp); 430470decc6SDave Kleikamp done_copy_out = 1; 431e06c8227SJoel Becker 432e06c8227SJoel Becker /* 433e06c8227SJoel Becker * This isn't strictly necessary, as we're using frozen 434e06c8227SJoel Becker * data for the escaping, but it keeps consistency with 435e06c8227SJoel Becker * b_frozen_data usage. 436e06c8227SJoel Becker */ 437e06c8227SJoel Becker jh_in->b_frozen_triggers = jh_in->b_triggers; 438470decc6SDave Kleikamp } 439470decc6SDave Kleikamp 440470decc6SDave Kleikamp /* 441470decc6SDave Kleikamp * Did we need to do an escaping? Now we've done all the 442470decc6SDave Kleikamp * copying, we can finally do so. 443470decc6SDave Kleikamp */ 444470decc6SDave Kleikamp if (do_escape) { 445303a8f2aSCong Wang mapped_data = kmap_atomic(new_page); 446470decc6SDave Kleikamp *((unsigned int *)(mapped_data + new_offset)) = 0; 447303a8f2aSCong Wang kunmap_atomic(mapped_data); 448470decc6SDave Kleikamp } 449470decc6SDave Kleikamp 450470decc6SDave Kleikamp set_bh_page(new_bh, new_page, new_offset); 451f5113effSJan Kara new_bh->b_size = bh_in->b_size; 452f5113effSJan Kara new_bh->b_bdev = journal->j_dev; 453470decc6SDave Kleikamp new_bh->b_blocknr = blocknr; 454*b34090e5SJan Kara new_bh->b_private = bh_in; 455470decc6SDave Kleikamp set_buffer_mapped(new_bh); 456470decc6SDave Kleikamp set_buffer_dirty(new_bh); 457470decc6SDave Kleikamp 458f5113effSJan Kara *bh_out = new_bh; 459470decc6SDave Kleikamp 460470decc6SDave Kleikamp /* 461470decc6SDave Kleikamp * The to-be-written buffer needs to get moved to the io queue, 462470decc6SDave Kleikamp * and the original buffer whose contents we are shadowing or 463470decc6SDave Kleikamp * copying is moved to the transaction's shadow queue. 464470decc6SDave Kleikamp */ 465470decc6SDave Kleikamp JBUFFER_TRACE(jh_in, "file as BJ_Shadow"); 46696577c43Sdingdinghua spin_lock(&journal->j_list_lock); 46796577c43Sdingdinghua __jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow); 46896577c43Sdingdinghua spin_unlock(&journal->j_list_lock); 469*b34090e5SJan Kara set_buffer_shadow(bh_in); 47096577c43Sdingdinghua jbd_unlock_bh_state(bh_in); 47196577c43Sdingdinghua 472470decc6SDave Kleikamp return do_escape | (done_copy_out << 1); 473470decc6SDave Kleikamp } 474470decc6SDave Kleikamp 475470decc6SDave Kleikamp /* 476470decc6SDave Kleikamp * Allocation code for the journal file. Manage the space left in the 477470decc6SDave Kleikamp * journal, so that we can begin checkpointing when appropriate. 478470decc6SDave Kleikamp */ 479470decc6SDave Kleikamp 480470decc6SDave Kleikamp /* 481f7f4bccbSMingming Cao * __jbd2_log_space_left: Return the number of free blocks left in the journal. 482470decc6SDave Kleikamp * 483470decc6SDave Kleikamp * Called with the journal already locked. 484470decc6SDave Kleikamp * 485470decc6SDave Kleikamp * Called under j_state_lock 486470decc6SDave Kleikamp */ 487470decc6SDave Kleikamp 488f7f4bccbSMingming Cao int __jbd2_log_space_left(journal_t *journal) 489470decc6SDave Kleikamp { 490470decc6SDave Kleikamp int left = journal->j_free; 491470decc6SDave Kleikamp 492a931da6aSTheodore Ts'o /* assert_spin_locked(&journal->j_state_lock); */ 493470decc6SDave Kleikamp 494470decc6SDave Kleikamp /* 495470decc6SDave Kleikamp * Be pessimistic here about the number of those free blocks which 496470decc6SDave Kleikamp * might be required for log descriptor control blocks. 497470decc6SDave Kleikamp */ 498470decc6SDave Kleikamp 499470decc6SDave Kleikamp #define MIN_LOG_RESERVED_BLOCKS 32 /* Allow for rounding errors */ 500470decc6SDave Kleikamp 501470decc6SDave Kleikamp left -= MIN_LOG_RESERVED_BLOCKS; 502470decc6SDave Kleikamp 503470decc6SDave Kleikamp if (left <= 0) 504470decc6SDave Kleikamp return 0; 505470decc6SDave Kleikamp left -= (left >> 3); 506470decc6SDave Kleikamp return left; 507470decc6SDave Kleikamp } 508470decc6SDave Kleikamp 509470decc6SDave Kleikamp /* 510e4471831STheodore Ts'o * Called with j_state_lock locked for writing. 511e4471831STheodore Ts'o * Returns true if a transaction commit was started. 512470decc6SDave Kleikamp */ 513f7f4bccbSMingming Cao int __jbd2_log_start_commit(journal_t *journal, tid_t target) 514470decc6SDave Kleikamp { 515e7b04ac0SEric Sandeen /* Return if the txn has already requested to be committed */ 516e7b04ac0SEric Sandeen if (journal->j_commit_request == target) 517e7b04ac0SEric Sandeen return 0; 518e7b04ac0SEric Sandeen 519470decc6SDave Kleikamp /* 520deeeaf13STheodore Ts'o * The only transaction we can possibly wait upon is the 521deeeaf13STheodore Ts'o * currently running transaction (if it exists). Otherwise, 522deeeaf13STheodore Ts'o * the target tid must be an old one. 523470decc6SDave Kleikamp */ 524deeeaf13STheodore Ts'o if (journal->j_running_transaction && 525deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid == target) { 526470decc6SDave Kleikamp /* 527bcf3d0bcSAndrea Gelmini * We want a new commit: OK, mark the request and wakeup the 528470decc6SDave Kleikamp * commit thread. We do _not_ do the commit ourselves. 529470decc6SDave Kleikamp */ 530470decc6SDave Kleikamp 531470decc6SDave Kleikamp journal->j_commit_request = target; 532f2a44523SEryu Guan jbd_debug(1, "JBD2: requesting commit %d/%d\n", 533470decc6SDave Kleikamp journal->j_commit_request, 534470decc6SDave Kleikamp journal->j_commit_sequence); 5359fff24aaSTheodore Ts'o journal->j_running_transaction->t_requested = jiffies; 536470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 537470decc6SDave Kleikamp return 1; 538deeeaf13STheodore Ts'o } else if (!tid_geq(journal->j_commit_request, target)) 539deeeaf13STheodore Ts'o /* This should never happen, but if it does, preserve 540deeeaf13STheodore Ts'o the evidence before kjournald goes into a loop and 541deeeaf13STheodore Ts'o increments j_commit_sequence beyond all recognition. */ 542f2a44523SEryu Guan WARN_ONCE(1, "JBD2: bad log_start_commit: %u %u %u %u\n", 5431be2add6STheodore Ts'o journal->j_commit_request, 5441be2add6STheodore Ts'o journal->j_commit_sequence, 545deeeaf13STheodore Ts'o target, journal->j_running_transaction ? 546deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid : 0); 547470decc6SDave Kleikamp return 0; 548470decc6SDave Kleikamp } 549470decc6SDave Kleikamp 550f7f4bccbSMingming Cao int jbd2_log_start_commit(journal_t *journal, tid_t tid) 551470decc6SDave Kleikamp { 552470decc6SDave Kleikamp int ret; 553470decc6SDave Kleikamp 554a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 555f7f4bccbSMingming Cao ret = __jbd2_log_start_commit(journal, tid); 556a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 557470decc6SDave Kleikamp return ret; 558470decc6SDave Kleikamp } 559470decc6SDave Kleikamp 560470decc6SDave Kleikamp /* 561470decc6SDave Kleikamp * Force and wait upon a commit if the calling process is not within 562470decc6SDave Kleikamp * transaction. This is used for forcing out undo-protected data which contains 563470decc6SDave Kleikamp * bitmaps, when the fs is running out of space. 564470decc6SDave Kleikamp * 565470decc6SDave Kleikamp * We can only force the running transaction if we don't have an active handle; 566470decc6SDave Kleikamp * otherwise, we will deadlock. 567470decc6SDave Kleikamp * 568470decc6SDave Kleikamp * Returns true if a transaction was started. 569470decc6SDave Kleikamp */ 570f7f4bccbSMingming Cao int jbd2_journal_force_commit_nested(journal_t *journal) 571470decc6SDave Kleikamp { 572470decc6SDave Kleikamp transaction_t *transaction = NULL; 573470decc6SDave Kleikamp tid_t tid; 574e4471831STheodore Ts'o int need_to_start = 0; 575470decc6SDave Kleikamp 576a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 577470decc6SDave Kleikamp if (journal->j_running_transaction && !current->journal_info) { 578470decc6SDave Kleikamp transaction = journal->j_running_transaction; 579e4471831STheodore Ts'o if (!tid_geq(journal->j_commit_request, transaction->t_tid)) 580e4471831STheodore Ts'o need_to_start = 1; 581470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 582470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 583470decc6SDave Kleikamp 584470decc6SDave Kleikamp if (!transaction) { 585a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 586470decc6SDave Kleikamp return 0; /* Nothing to retry */ 587470decc6SDave Kleikamp } 588470decc6SDave Kleikamp 589470decc6SDave Kleikamp tid = transaction->t_tid; 590a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 591e4471831STheodore Ts'o if (need_to_start) 592e4471831STheodore Ts'o jbd2_log_start_commit(journal, tid); 593f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 594470decc6SDave Kleikamp return 1; 595470decc6SDave Kleikamp } 596470decc6SDave Kleikamp 597470decc6SDave Kleikamp /* 598470decc6SDave Kleikamp * Start a commit of the current running transaction (if any). Returns true 599c88ccea3SJan Kara * if a transaction is going to be committed (or is currently already 600c88ccea3SJan Kara * committing), and fills its tid in at *ptid 601470decc6SDave Kleikamp */ 602f7f4bccbSMingming Cao int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) 603470decc6SDave Kleikamp { 604470decc6SDave Kleikamp int ret = 0; 605470decc6SDave Kleikamp 606a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 607470decc6SDave Kleikamp if (journal->j_running_transaction) { 608470decc6SDave Kleikamp tid_t tid = journal->j_running_transaction->t_tid; 609470decc6SDave Kleikamp 610c88ccea3SJan Kara __jbd2_log_start_commit(journal, tid); 611c88ccea3SJan Kara /* There's a running transaction and we've just made sure 612c88ccea3SJan Kara * it's commit has been scheduled. */ 613c88ccea3SJan Kara if (ptid) 614470decc6SDave Kleikamp *ptid = tid; 615c88ccea3SJan Kara ret = 1; 616c88ccea3SJan Kara } else if (journal->j_committing_transaction) { 617470decc6SDave Kleikamp /* 61812810ad7SArtem Bityutskiy * If commit has been started, then we have to wait for 61912810ad7SArtem Bityutskiy * completion of that transaction. 620470decc6SDave Kleikamp */ 621c88ccea3SJan Kara if (ptid) 622470decc6SDave Kleikamp *ptid = journal->j_committing_transaction->t_tid; 623470decc6SDave Kleikamp ret = 1; 624470decc6SDave Kleikamp } 625a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 626470decc6SDave Kleikamp return ret; 627470decc6SDave Kleikamp } 628470decc6SDave Kleikamp 629470decc6SDave Kleikamp /* 630bbd2be36SJan Kara * Return 1 if a given transaction has not yet sent barrier request 631bbd2be36SJan Kara * connected with a transaction commit. If 0 is returned, transaction 632bbd2be36SJan Kara * may or may not have sent the barrier. Used to avoid sending barrier 633bbd2be36SJan Kara * twice in common cases. 634bbd2be36SJan Kara */ 635bbd2be36SJan Kara int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid) 636bbd2be36SJan Kara { 637bbd2be36SJan Kara int ret = 0; 638bbd2be36SJan Kara transaction_t *commit_trans; 639bbd2be36SJan Kara 640bbd2be36SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 641bbd2be36SJan Kara return 0; 642bbd2be36SJan Kara read_lock(&journal->j_state_lock); 643bbd2be36SJan Kara /* Transaction already committed? */ 644bbd2be36SJan Kara if (tid_geq(journal->j_commit_sequence, tid)) 645bbd2be36SJan Kara goto out; 646bbd2be36SJan Kara commit_trans = journal->j_committing_transaction; 647bbd2be36SJan Kara if (!commit_trans || commit_trans->t_tid != tid) { 648bbd2be36SJan Kara ret = 1; 649bbd2be36SJan Kara goto out; 650bbd2be36SJan Kara } 651bbd2be36SJan Kara /* 652bbd2be36SJan Kara * Transaction is being committed and we already proceeded to 653bbd2be36SJan Kara * submitting a flush to fs partition? 654bbd2be36SJan Kara */ 655bbd2be36SJan Kara if (journal->j_fs_dev != journal->j_dev) { 656bbd2be36SJan Kara if (!commit_trans->t_need_data_flush || 657bbd2be36SJan Kara commit_trans->t_state >= T_COMMIT_DFLUSH) 658bbd2be36SJan Kara goto out; 659bbd2be36SJan Kara } else { 660bbd2be36SJan Kara if (commit_trans->t_state >= T_COMMIT_JFLUSH) 661bbd2be36SJan Kara goto out; 662bbd2be36SJan Kara } 663bbd2be36SJan Kara ret = 1; 664bbd2be36SJan Kara out: 665bbd2be36SJan Kara read_unlock(&journal->j_state_lock); 666bbd2be36SJan Kara return ret; 667bbd2be36SJan Kara } 668bbd2be36SJan Kara EXPORT_SYMBOL(jbd2_trans_will_send_data_barrier); 669bbd2be36SJan Kara 670bbd2be36SJan Kara /* 671470decc6SDave Kleikamp * Wait for a specified commit to complete. 672470decc6SDave Kleikamp * The caller may not hold the journal lock. 673470decc6SDave Kleikamp */ 674f7f4bccbSMingming Cao int jbd2_log_wait_commit(journal_t *journal, tid_t tid) 675470decc6SDave Kleikamp { 676470decc6SDave Kleikamp int err = 0; 677470decc6SDave Kleikamp 678a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 679e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 680470decc6SDave Kleikamp if (!tid_geq(journal->j_commit_request, tid)) { 681470decc6SDave Kleikamp printk(KERN_EMERG 682470decc6SDave Kleikamp "%s: error: j_commit_request=%d, tid=%d\n", 683329d291fSHarvey Harrison __func__, journal->j_commit_request, tid); 684470decc6SDave Kleikamp } 685470decc6SDave Kleikamp #endif 686470decc6SDave Kleikamp while (tid_gt(tid, journal->j_commit_sequence)) { 687f2a44523SEryu Guan jbd_debug(1, "JBD2: want %d, j_commit_sequence=%d\n", 688470decc6SDave Kleikamp tid, journal->j_commit_sequence); 689470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 690a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 691470decc6SDave Kleikamp wait_event(journal->j_wait_done_commit, 692470decc6SDave Kleikamp !tid_gt(tid, journal->j_commit_sequence)); 693a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 694470decc6SDave Kleikamp } 695a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 696470decc6SDave Kleikamp 697470decc6SDave Kleikamp if (unlikely(is_journal_aborted(journal))) { 698470decc6SDave Kleikamp printk(KERN_EMERG "journal commit I/O error\n"); 699470decc6SDave Kleikamp err = -EIO; 700470decc6SDave Kleikamp } 701470decc6SDave Kleikamp return err; 702470decc6SDave Kleikamp } 703470decc6SDave Kleikamp 704470decc6SDave Kleikamp /* 705d76a3a77STheodore Ts'o * When this function returns the transaction corresponding to tid 706d76a3a77STheodore Ts'o * will be completed. If the transaction has currently running, start 707d76a3a77STheodore Ts'o * committing that transaction before waiting for it to complete. If 708d76a3a77STheodore Ts'o * the transaction id is stale, it is by definition already completed, 709d76a3a77STheodore Ts'o * so just return SUCCESS. 710d76a3a77STheodore Ts'o */ 711d76a3a77STheodore Ts'o int jbd2_complete_transaction(journal_t *journal, tid_t tid) 712d76a3a77STheodore Ts'o { 713d76a3a77STheodore Ts'o int need_to_wait = 1; 714d76a3a77STheodore Ts'o 715d76a3a77STheodore Ts'o read_lock(&journal->j_state_lock); 716d76a3a77STheodore Ts'o if (journal->j_running_transaction && 717d76a3a77STheodore Ts'o journal->j_running_transaction->t_tid == tid) { 718d76a3a77STheodore Ts'o if (journal->j_commit_request != tid) { 719d76a3a77STheodore Ts'o /* transaction not yet started, so request it */ 720d76a3a77STheodore Ts'o read_unlock(&journal->j_state_lock); 721d76a3a77STheodore Ts'o jbd2_log_start_commit(journal, tid); 722d76a3a77STheodore Ts'o goto wait_commit; 723d76a3a77STheodore Ts'o } 724d76a3a77STheodore Ts'o } else if (!(journal->j_committing_transaction && 725d76a3a77STheodore Ts'o journal->j_committing_transaction->t_tid == tid)) 726d76a3a77STheodore Ts'o need_to_wait = 0; 727d76a3a77STheodore Ts'o read_unlock(&journal->j_state_lock); 728d76a3a77STheodore Ts'o if (!need_to_wait) 729d76a3a77STheodore Ts'o return 0; 730d76a3a77STheodore Ts'o wait_commit: 731d76a3a77STheodore Ts'o return jbd2_log_wait_commit(journal, tid); 732d76a3a77STheodore Ts'o } 733d76a3a77STheodore Ts'o EXPORT_SYMBOL(jbd2_complete_transaction); 734d76a3a77STheodore Ts'o 735d76a3a77STheodore Ts'o /* 736470decc6SDave Kleikamp * Log buffer allocation routines: 737470decc6SDave Kleikamp */ 738470decc6SDave Kleikamp 73918eba7aaSMingming Cao int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) 740470decc6SDave Kleikamp { 741470decc6SDave Kleikamp unsigned long blocknr; 742470decc6SDave Kleikamp 743a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 744470decc6SDave Kleikamp J_ASSERT(journal->j_free > 1); 745470decc6SDave Kleikamp 746470decc6SDave Kleikamp blocknr = journal->j_head; 747470decc6SDave Kleikamp journal->j_head++; 748470decc6SDave Kleikamp journal->j_free--; 749470decc6SDave Kleikamp if (journal->j_head == journal->j_last) 750470decc6SDave Kleikamp journal->j_head = journal->j_first; 751a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 752f7f4bccbSMingming Cao return jbd2_journal_bmap(journal, blocknr, retp); 753470decc6SDave Kleikamp } 754470decc6SDave Kleikamp 755470decc6SDave Kleikamp /* 756470decc6SDave Kleikamp * Conversion of logical to physical block numbers for the journal 757470decc6SDave Kleikamp * 758470decc6SDave Kleikamp * On external journals the journal blocks are identity-mapped, so 759470decc6SDave Kleikamp * this is a no-op. If needed, we can use j_blk_offset - everything is 760470decc6SDave Kleikamp * ready. 761470decc6SDave Kleikamp */ 762f7f4bccbSMingming Cao int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, 76318eba7aaSMingming Cao unsigned long long *retp) 764470decc6SDave Kleikamp { 765470decc6SDave Kleikamp int err = 0; 76618eba7aaSMingming Cao unsigned long long ret; 767470decc6SDave Kleikamp 768470decc6SDave Kleikamp if (journal->j_inode) { 769470decc6SDave Kleikamp ret = bmap(journal->j_inode, blocknr); 770470decc6SDave Kleikamp if (ret) 771470decc6SDave Kleikamp *retp = ret; 772470decc6SDave Kleikamp else { 773470decc6SDave Kleikamp printk(KERN_ALERT "%s: journal block not found " 774470decc6SDave Kleikamp "at offset %lu on %s\n", 77505496769STheodore Ts'o __func__, blocknr, journal->j_devname); 776470decc6SDave Kleikamp err = -EIO; 777470decc6SDave Kleikamp __journal_abort_soft(journal, err); 778470decc6SDave Kleikamp } 779470decc6SDave Kleikamp } else { 780470decc6SDave Kleikamp *retp = blocknr; /* +journal->j_blk_offset */ 781470decc6SDave Kleikamp } 782470decc6SDave Kleikamp return err; 783470decc6SDave Kleikamp } 784470decc6SDave Kleikamp 785470decc6SDave Kleikamp /* 786470decc6SDave Kleikamp * We play buffer_head aliasing tricks to write data/metadata blocks to 787470decc6SDave Kleikamp * the journal without copying their contents, but for journal 788470decc6SDave Kleikamp * descriptor blocks we do need to generate bona fide buffers. 789470decc6SDave Kleikamp * 790f7f4bccbSMingming Cao * After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying 791470decc6SDave Kleikamp * the buffer's contents they really should run flush_dcache_page(bh->b_page). 792470decc6SDave Kleikamp * But we don't bother doing that, so there will be coherency problems with 793470decc6SDave Kleikamp * mmaps of blockdevs which hold live JBD-controlled filesystems. 794470decc6SDave Kleikamp */ 795e5a120aeSJan Kara struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) 796470decc6SDave Kleikamp { 797470decc6SDave Kleikamp struct buffer_head *bh; 79818eba7aaSMingming Cao unsigned long long blocknr; 799470decc6SDave Kleikamp int err; 800470decc6SDave Kleikamp 801f7f4bccbSMingming Cao err = jbd2_journal_next_log_block(journal, &blocknr); 802470decc6SDave Kleikamp 803470decc6SDave Kleikamp if (err) 804470decc6SDave Kleikamp return NULL; 805470decc6SDave Kleikamp 806470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 8074b905671SJan Kara if (!bh) 8084b905671SJan Kara return NULL; 809470decc6SDave Kleikamp lock_buffer(bh); 810470decc6SDave Kleikamp memset(bh->b_data, 0, journal->j_blocksize); 811470decc6SDave Kleikamp set_buffer_uptodate(bh); 812470decc6SDave Kleikamp unlock_buffer(bh); 813470decc6SDave Kleikamp BUFFER_TRACE(bh, "return this buffer"); 814e5a120aeSJan Kara return bh; 815470decc6SDave Kleikamp } 816470decc6SDave Kleikamp 81779feb521SJan Kara /* 81879feb521SJan Kara * Return tid of the oldest transaction in the journal and block in the journal 81979feb521SJan Kara * where the transaction starts. 82079feb521SJan Kara * 82179feb521SJan Kara * If the journal is now empty, return which will be the next transaction ID 82279feb521SJan Kara * we will write and where will that transaction start. 82379feb521SJan Kara * 82479feb521SJan Kara * The return value is 0 if journal tail cannot be pushed any further, 1 if 82579feb521SJan Kara * it can. 82679feb521SJan Kara */ 82779feb521SJan Kara int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, 82879feb521SJan Kara unsigned long *block) 82979feb521SJan Kara { 83079feb521SJan Kara transaction_t *transaction; 83179feb521SJan Kara int ret; 83279feb521SJan Kara 83379feb521SJan Kara read_lock(&journal->j_state_lock); 83479feb521SJan Kara spin_lock(&journal->j_list_lock); 83579feb521SJan Kara transaction = journal->j_checkpoint_transactions; 83679feb521SJan Kara if (transaction) { 83779feb521SJan Kara *tid = transaction->t_tid; 83879feb521SJan Kara *block = transaction->t_log_start; 83979feb521SJan Kara } else if ((transaction = journal->j_committing_transaction) != NULL) { 84079feb521SJan Kara *tid = transaction->t_tid; 84179feb521SJan Kara *block = transaction->t_log_start; 84279feb521SJan Kara } else if ((transaction = journal->j_running_transaction) != NULL) { 84379feb521SJan Kara *tid = transaction->t_tid; 84479feb521SJan Kara *block = journal->j_head; 84579feb521SJan Kara } else { 84679feb521SJan Kara *tid = journal->j_transaction_sequence; 84779feb521SJan Kara *block = journal->j_head; 84879feb521SJan Kara } 84979feb521SJan Kara ret = tid_gt(*tid, journal->j_tail_sequence); 85079feb521SJan Kara spin_unlock(&journal->j_list_lock); 85179feb521SJan Kara read_unlock(&journal->j_state_lock); 85279feb521SJan Kara 85379feb521SJan Kara return ret; 85479feb521SJan Kara } 85579feb521SJan Kara 85679feb521SJan Kara /* 85779feb521SJan Kara * Update information in journal structure and in on disk journal superblock 85879feb521SJan Kara * about log tail. This function does not check whether information passed in 85979feb521SJan Kara * really pushes log tail further. It's responsibility of the caller to make 86079feb521SJan Kara * sure provided log tail information is valid (e.g. by holding 86179feb521SJan Kara * j_checkpoint_mutex all the time between computing log tail and calling this 86279feb521SJan Kara * function as is the case with jbd2_cleanup_journal_tail()). 86379feb521SJan Kara * 86479feb521SJan Kara * Requires j_checkpoint_mutex 86579feb521SJan Kara */ 86679feb521SJan Kara void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 86779feb521SJan Kara { 86879feb521SJan Kara unsigned long freed; 86979feb521SJan Kara 87079feb521SJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 87179feb521SJan Kara 87279feb521SJan Kara /* 87379feb521SJan Kara * We cannot afford for write to remain in drive's caches since as 87479feb521SJan Kara * soon as we update j_tail, next transaction can start reusing journal 87579feb521SJan Kara * space and if we lose sb update during power failure we'd replay 87679feb521SJan Kara * old transaction with possibly newly overwritten data. 87779feb521SJan Kara */ 87879feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, tid, block, WRITE_FUA); 87979feb521SJan Kara write_lock(&journal->j_state_lock); 88079feb521SJan Kara freed = block - journal->j_tail; 88179feb521SJan Kara if (block < journal->j_tail) 88279feb521SJan Kara freed += journal->j_last - journal->j_first; 88379feb521SJan Kara 88479feb521SJan Kara trace_jbd2_update_log_tail(journal, tid, block, freed); 88579feb521SJan Kara jbd_debug(1, 88679feb521SJan Kara "Cleaning journal tail from %d to %d (offset %lu), " 88779feb521SJan Kara "freeing %lu\n", 88879feb521SJan Kara journal->j_tail_sequence, tid, block, freed); 88979feb521SJan Kara 89079feb521SJan Kara journal->j_free += freed; 89179feb521SJan Kara journal->j_tail_sequence = tid; 89279feb521SJan Kara journal->j_tail = block; 89379feb521SJan Kara write_unlock(&journal->j_state_lock); 89479feb521SJan Kara } 89579feb521SJan Kara 8963339578fSJan Kara /* 8973339578fSJan Kara * This is a variaon of __jbd2_update_log_tail which checks for validity of 8983339578fSJan Kara * provided log tail and locks j_checkpoint_mutex. So it is safe against races 8993339578fSJan Kara * with other threads updating log tail. 9003339578fSJan Kara */ 9013339578fSJan Kara void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 9023339578fSJan Kara { 9033339578fSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 9043339578fSJan Kara if (tid_gt(tid, journal->j_tail_sequence)) 9053339578fSJan Kara __jbd2_update_log_tail(journal, tid, block); 9063339578fSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 9073339578fSJan Kara } 9083339578fSJan Kara 9098e85fb3fSJohann Lombardi struct jbd2_stats_proc_session { 9108e85fb3fSJohann Lombardi journal_t *journal; 9118e85fb3fSJohann Lombardi struct transaction_stats_s *stats; 9128e85fb3fSJohann Lombardi int start; 9138e85fb3fSJohann Lombardi int max; 9148e85fb3fSJohann Lombardi }; 9158e85fb3fSJohann Lombardi 9168e85fb3fSJohann Lombardi static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) 9178e85fb3fSJohann Lombardi { 9188e85fb3fSJohann Lombardi return *pos ? NULL : SEQ_START_TOKEN; 9198e85fb3fSJohann Lombardi } 9208e85fb3fSJohann Lombardi 9218e85fb3fSJohann Lombardi static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) 9228e85fb3fSJohann Lombardi { 9238e85fb3fSJohann Lombardi return NULL; 9248e85fb3fSJohann Lombardi } 9258e85fb3fSJohann Lombardi 9268e85fb3fSJohann Lombardi static int jbd2_seq_info_show(struct seq_file *seq, void *v) 9278e85fb3fSJohann Lombardi { 9288e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 9298e85fb3fSJohann Lombardi 9308e85fb3fSJohann Lombardi if (v != SEQ_START_TOKEN) 9318e85fb3fSJohann Lombardi return 0; 9329fff24aaSTheodore Ts'o seq_printf(seq, "%lu transactions (%lu requested), " 9339fff24aaSTheodore Ts'o "each up to %u blocks\n", 9349fff24aaSTheodore Ts'o s->stats->ts_tid, s->stats->ts_requested, 9358e85fb3fSJohann Lombardi s->journal->j_max_transaction_buffers); 9368e85fb3fSJohann Lombardi if (s->stats->ts_tid == 0) 9378e85fb3fSJohann Lombardi return 0; 9388e85fb3fSJohann Lombardi seq_printf(seq, "average: \n %ums waiting for transaction\n", 939bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); 9409fff24aaSTheodore Ts'o seq_printf(seq, " %ums request delay\n", 9419fff24aaSTheodore Ts'o (s->stats->ts_requested == 0) ? 0 : 9429fff24aaSTheodore Ts'o jiffies_to_msecs(s->stats->run.rs_request_delay / 9439fff24aaSTheodore Ts'o s->stats->ts_requested)); 9448e85fb3fSJohann Lombardi seq_printf(seq, " %ums running transaction\n", 945bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); 9468e85fb3fSJohann Lombardi seq_printf(seq, " %ums transaction was being locked\n", 947bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); 9488e85fb3fSJohann Lombardi seq_printf(seq, " %ums flushing data (in ordered mode)\n", 949bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); 9508e85fb3fSJohann Lombardi seq_printf(seq, " %ums logging transaction\n", 951bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); 952c225aa57SSimon Holm Thøgersen seq_printf(seq, " %lluus average transaction commit time\n", 953c225aa57SSimon Holm Thøgersen div_u64(s->journal->j_average_commit_time, 1000)); 9548e85fb3fSJohann Lombardi seq_printf(seq, " %lu handles per transaction\n", 955bf699327STheodore Ts'o s->stats->run.rs_handle_count / s->stats->ts_tid); 9568e85fb3fSJohann Lombardi seq_printf(seq, " %lu blocks per transaction\n", 957bf699327STheodore Ts'o s->stats->run.rs_blocks / s->stats->ts_tid); 9588e85fb3fSJohann Lombardi seq_printf(seq, " %lu logged blocks per transaction\n", 959bf699327STheodore Ts'o s->stats->run.rs_blocks_logged / s->stats->ts_tid); 9608e85fb3fSJohann Lombardi return 0; 9618e85fb3fSJohann Lombardi } 9628e85fb3fSJohann Lombardi 9638e85fb3fSJohann Lombardi static void jbd2_seq_info_stop(struct seq_file *seq, void *v) 9648e85fb3fSJohann Lombardi { 9658e85fb3fSJohann Lombardi } 9668e85fb3fSJohann Lombardi 96788e9d34cSJames Morris static const struct seq_operations jbd2_seq_info_ops = { 9688e85fb3fSJohann Lombardi .start = jbd2_seq_info_start, 9698e85fb3fSJohann Lombardi .next = jbd2_seq_info_next, 9708e85fb3fSJohann Lombardi .stop = jbd2_seq_info_stop, 9718e85fb3fSJohann Lombardi .show = jbd2_seq_info_show, 9728e85fb3fSJohann Lombardi }; 9738e85fb3fSJohann Lombardi 9748e85fb3fSJohann Lombardi static int jbd2_seq_info_open(struct inode *inode, struct file *file) 9758e85fb3fSJohann Lombardi { 976d9dda78bSAl Viro journal_t *journal = PDE_DATA(inode); 9778e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 9788e85fb3fSJohann Lombardi int rc, size; 9798e85fb3fSJohann Lombardi 9808e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 9818e85fb3fSJohann Lombardi if (s == NULL) 9828e85fb3fSJohann Lombardi return -ENOMEM; 9838e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s); 9848e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 9858e85fb3fSJohann Lombardi if (s->stats == NULL) { 9868e85fb3fSJohann Lombardi kfree(s); 9878e85fb3fSJohann Lombardi return -ENOMEM; 9888e85fb3fSJohann Lombardi } 9898e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 9908e85fb3fSJohann Lombardi memcpy(s->stats, &journal->j_stats, size); 9918e85fb3fSJohann Lombardi s->journal = journal; 9928e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 9938e85fb3fSJohann Lombardi 9948e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_info_ops); 9958e85fb3fSJohann Lombardi if (rc == 0) { 9968e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 9978e85fb3fSJohann Lombardi m->private = s; 9988e85fb3fSJohann Lombardi } else { 9998e85fb3fSJohann Lombardi kfree(s->stats); 10008e85fb3fSJohann Lombardi kfree(s); 10018e85fb3fSJohann Lombardi } 10028e85fb3fSJohann Lombardi return rc; 10038e85fb3fSJohann Lombardi 10048e85fb3fSJohann Lombardi } 10058e85fb3fSJohann Lombardi 10068e85fb3fSJohann Lombardi static int jbd2_seq_info_release(struct inode *inode, struct file *file) 10078e85fb3fSJohann Lombardi { 10088e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 10098e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 10108e85fb3fSJohann Lombardi kfree(s->stats); 10118e85fb3fSJohann Lombardi kfree(s); 10128e85fb3fSJohann Lombardi return seq_release(inode, file); 10138e85fb3fSJohann Lombardi } 10148e85fb3fSJohann Lombardi 1015828c0950SAlexey Dobriyan static const struct file_operations jbd2_seq_info_fops = { 10168e85fb3fSJohann Lombardi .owner = THIS_MODULE, 10178e85fb3fSJohann Lombardi .open = jbd2_seq_info_open, 10188e85fb3fSJohann Lombardi .read = seq_read, 10198e85fb3fSJohann Lombardi .llseek = seq_lseek, 10208e85fb3fSJohann Lombardi .release = jbd2_seq_info_release, 10218e85fb3fSJohann Lombardi }; 10228e85fb3fSJohann Lombardi 10238e85fb3fSJohann Lombardi static struct proc_dir_entry *proc_jbd2_stats; 10248e85fb3fSJohann Lombardi 10258e85fb3fSJohann Lombardi static void jbd2_stats_proc_init(journal_t *journal) 10268e85fb3fSJohann Lombardi { 102705496769STheodore Ts'o journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); 10288e85fb3fSJohann Lombardi if (journal->j_proc_entry) { 102979da3664SDenis V. Lunev proc_create_data("info", S_IRUGO, journal->j_proc_entry, 103079da3664SDenis V. Lunev &jbd2_seq_info_fops, journal); 10318e85fb3fSJohann Lombardi } 10328e85fb3fSJohann Lombardi } 10338e85fb3fSJohann Lombardi 10348e85fb3fSJohann Lombardi static void jbd2_stats_proc_exit(journal_t *journal) 10358e85fb3fSJohann Lombardi { 10368e85fb3fSJohann Lombardi remove_proc_entry("info", journal->j_proc_entry); 103705496769STheodore Ts'o remove_proc_entry(journal->j_devname, proc_jbd2_stats); 10388e85fb3fSJohann Lombardi } 10398e85fb3fSJohann Lombardi 1040470decc6SDave Kleikamp /* 1041470decc6SDave Kleikamp * Management for journal control blocks: functions to create and 1042470decc6SDave Kleikamp * destroy journal_t structures, and to initialise and read existing 1043470decc6SDave Kleikamp * journal blocks from disk. */ 1044470decc6SDave Kleikamp 1045470decc6SDave Kleikamp /* First: create and setup a journal_t object in memory. We initialise 1046470decc6SDave Kleikamp * very few fields yet: that has to wait until we have created the 1047470decc6SDave Kleikamp * journal structures from from scratch, or loaded them from disk. */ 1048470decc6SDave Kleikamp 1049470decc6SDave Kleikamp static journal_t * journal_init_common (void) 1050470decc6SDave Kleikamp { 1051470decc6SDave Kleikamp journal_t *journal; 1052470decc6SDave Kleikamp int err; 1053470decc6SDave Kleikamp 10543ebfdf88SAndrew Morton journal = kzalloc(sizeof(*journal), GFP_KERNEL); 1055470decc6SDave Kleikamp if (!journal) 1056b7271b0aSTheodore Ts'o return NULL; 1057470decc6SDave Kleikamp 1058470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_transaction_locked); 1059470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_logspace); 1060470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_done_commit); 1061470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_checkpoint); 1062470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_commit); 1063470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_updates); 1064470decc6SDave Kleikamp mutex_init(&journal->j_barrier); 1065470decc6SDave Kleikamp mutex_init(&journal->j_checkpoint_mutex); 1066470decc6SDave Kleikamp spin_lock_init(&journal->j_revoke_lock); 1067470decc6SDave Kleikamp spin_lock_init(&journal->j_list_lock); 1068a931da6aSTheodore Ts'o rwlock_init(&journal->j_state_lock); 1069470decc6SDave Kleikamp 1070cd02ff0bSMingming Cao journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); 107130773840STheodore Ts'o journal->j_min_batch_time = 0; 107230773840STheodore Ts'o journal->j_max_batch_time = 15000; /* 15ms */ 1073470decc6SDave Kleikamp 1074470decc6SDave Kleikamp /* The journal is marked for error until we succeed with recovery! */ 1075f7f4bccbSMingming Cao journal->j_flags = JBD2_ABORT; 1076470decc6SDave Kleikamp 1077470decc6SDave Kleikamp /* Set up a default-sized revoke table for the new mount. */ 1078f7f4bccbSMingming Cao err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); 1079470decc6SDave Kleikamp if (err) { 1080470decc6SDave Kleikamp kfree(journal); 1081b7271b0aSTheodore Ts'o return NULL; 1082470decc6SDave Kleikamp } 10838e85fb3fSJohann Lombardi 1084bf699327STheodore Ts'o spin_lock_init(&journal->j_history_lock); 10858e85fb3fSJohann Lombardi 1086470decc6SDave Kleikamp return journal; 1087470decc6SDave Kleikamp } 1088470decc6SDave Kleikamp 1089f7f4bccbSMingming Cao /* jbd2_journal_init_dev and jbd2_journal_init_inode: 1090470decc6SDave Kleikamp * 1091470decc6SDave Kleikamp * Create a journal structure assigned some fixed set of disk blocks to 1092470decc6SDave Kleikamp * the journal. We don't actually touch those disk blocks yet, but we 1093470decc6SDave Kleikamp * need to set up all of the mapping information to tell the journaling 1094470decc6SDave Kleikamp * system where the journal blocks are. 1095470decc6SDave Kleikamp * 1096470decc6SDave Kleikamp */ 1097470decc6SDave Kleikamp 1098470decc6SDave Kleikamp /** 10995648ba5bSRandy Dunlap * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure 1100470decc6SDave Kleikamp * @bdev: Block device on which to create the journal 1101470decc6SDave Kleikamp * @fs_dev: Device which hold journalled filesystem for this journal. 1102470decc6SDave Kleikamp * @start: Block nr Start of journal. 1103470decc6SDave Kleikamp * @len: Length of the journal in blocks. 1104470decc6SDave Kleikamp * @blocksize: blocksize of journalling device 11055648ba5bSRandy Dunlap * 11065648ba5bSRandy Dunlap * Returns: a newly created journal_t * 1107470decc6SDave Kleikamp * 1108f7f4bccbSMingming Cao * jbd2_journal_init_dev creates a journal which maps a fixed contiguous 1109470decc6SDave Kleikamp * range of blocks on an arbitrary block device. 1110470decc6SDave Kleikamp * 1111470decc6SDave Kleikamp */ 1112f7f4bccbSMingming Cao journal_t * jbd2_journal_init_dev(struct block_device *bdev, 1113470decc6SDave Kleikamp struct block_device *fs_dev, 111418eba7aaSMingming Cao unsigned long long start, int len, int blocksize) 1115470decc6SDave Kleikamp { 1116470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 1117470decc6SDave Kleikamp struct buffer_head *bh; 111805496769STheodore Ts'o char *p; 1119470decc6SDave Kleikamp int n; 1120470decc6SDave Kleikamp 1121470decc6SDave Kleikamp if (!journal) 1122470decc6SDave Kleikamp return NULL; 1123470decc6SDave Kleikamp 1124470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1125470decc6SDave Kleikamp journal->j_blocksize = blocksize; 11260587aa3dSyangsheng journal->j_dev = bdev; 11270587aa3dSyangsheng journal->j_fs_dev = fs_dev; 11280587aa3dSyangsheng journal->j_blk_offset = start; 11290587aa3dSyangsheng journal->j_maxlen = len; 11300587aa3dSyangsheng bdevname(journal->j_dev, journal->j_devname); 11310587aa3dSyangsheng p = journal->j_devname; 11320587aa3dSyangsheng while ((p = strchr(p, '/'))) 11330587aa3dSyangsheng *p = '!'; 11344b905671SJan Kara jbd2_stats_proc_init(journal); 1135470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1136470decc6SDave Kleikamp journal->j_wbufsize = n; 1137470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1138470decc6SDave Kleikamp if (!journal->j_wbuf) { 113925985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1140329d291fSHarvey Harrison __func__); 11414b905671SJan Kara goto out_err; 1142470decc6SDave Kleikamp } 1143470decc6SDave Kleikamp 1144470decc6SDave Kleikamp bh = __getblk(journal->j_dev, start, journal->j_blocksize); 11454b905671SJan Kara if (!bh) { 11464b905671SJan Kara printk(KERN_ERR 11474b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 11484b905671SJan Kara __func__); 11494b905671SJan Kara goto out_err; 11504b905671SJan Kara } 1151470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1152470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 11534b905671SJan Kara 1154470decc6SDave Kleikamp return journal; 11554b905671SJan Kara out_err: 11567b02bec0STao Ma kfree(journal->j_wbuf); 11574b905671SJan Kara jbd2_stats_proc_exit(journal); 11584b905671SJan Kara kfree(journal); 11594b905671SJan Kara return NULL; 1160470decc6SDave Kleikamp } 1161470decc6SDave Kleikamp 1162470decc6SDave Kleikamp /** 1163f7f4bccbSMingming Cao * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. 1164470decc6SDave Kleikamp * @inode: An inode to create the journal in 1165470decc6SDave Kleikamp * 1166f7f4bccbSMingming Cao * jbd2_journal_init_inode creates a journal which maps an on-disk inode as 1167470decc6SDave Kleikamp * the journal. The inode must exist already, must support bmap() and 1168470decc6SDave Kleikamp * must have all data blocks preallocated. 1169470decc6SDave Kleikamp */ 1170f7f4bccbSMingming Cao journal_t * jbd2_journal_init_inode (struct inode *inode) 1171470decc6SDave Kleikamp { 1172470decc6SDave Kleikamp struct buffer_head *bh; 1173470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 117405496769STheodore Ts'o char *p; 1175470decc6SDave Kleikamp int err; 1176470decc6SDave Kleikamp int n; 117718eba7aaSMingming Cao unsigned long long blocknr; 1178470decc6SDave Kleikamp 1179470decc6SDave Kleikamp if (!journal) 1180470decc6SDave Kleikamp return NULL; 1181470decc6SDave Kleikamp 1182470decc6SDave Kleikamp journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; 1183470decc6SDave Kleikamp journal->j_inode = inode; 118405496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 118505496769STheodore Ts'o p = journal->j_devname; 118605496769STheodore Ts'o while ((p = strchr(p, '/'))) 118705496769STheodore Ts'o *p = '!'; 118805496769STheodore Ts'o p = journal->j_devname + strlen(journal->j_devname); 118990576c0bSTheodore Ts'o sprintf(p, "-%lu", journal->j_inode->i_ino); 1190470decc6SDave Kleikamp jbd_debug(1, 1191470decc6SDave Kleikamp "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", 1192470decc6SDave Kleikamp journal, inode->i_sb->s_id, inode->i_ino, 1193470decc6SDave Kleikamp (long long) inode->i_size, 1194470decc6SDave Kleikamp inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); 1195470decc6SDave Kleikamp 1196470decc6SDave Kleikamp journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; 1197470decc6SDave Kleikamp journal->j_blocksize = inode->i_sb->s_blocksize; 11988e85fb3fSJohann Lombardi jbd2_stats_proc_init(journal); 1199470decc6SDave Kleikamp 1200470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1201470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1202470decc6SDave Kleikamp journal->j_wbufsize = n; 1203470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1204470decc6SDave Kleikamp if (!journal->j_wbuf) { 120525985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1206329d291fSHarvey Harrison __func__); 12074b905671SJan Kara goto out_err; 1208470decc6SDave Kleikamp } 1209470decc6SDave Kleikamp 1210f7f4bccbSMingming Cao err = jbd2_journal_bmap(journal, 0, &blocknr); 1211470decc6SDave Kleikamp /* If that failed, give up */ 1212470decc6SDave Kleikamp if (err) { 12133c26bdb4SJustin P. Mattock printk(KERN_ERR "%s: Cannot locate journal superblock\n", 1214329d291fSHarvey Harrison __func__); 12154b905671SJan Kara goto out_err; 1216470decc6SDave Kleikamp } 1217470decc6SDave Kleikamp 1218470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 12194b905671SJan Kara if (!bh) { 12204b905671SJan Kara printk(KERN_ERR 12214b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 12224b905671SJan Kara __func__); 12234b905671SJan Kara goto out_err; 12244b905671SJan Kara } 1225470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1226470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 1227470decc6SDave Kleikamp 1228470decc6SDave Kleikamp return journal; 12294b905671SJan Kara out_err: 12307b02bec0STao Ma kfree(journal->j_wbuf); 12314b905671SJan Kara jbd2_stats_proc_exit(journal); 12324b905671SJan Kara kfree(journal); 12334b905671SJan Kara return NULL; 1234470decc6SDave Kleikamp } 1235470decc6SDave Kleikamp 1236470decc6SDave Kleikamp /* 1237470decc6SDave Kleikamp * If the journal init or create aborts, we need to mark the journal 1238470decc6SDave Kleikamp * superblock as being NULL to prevent the journal destroy from writing 1239470decc6SDave Kleikamp * back a bogus superblock. 1240470decc6SDave Kleikamp */ 1241470decc6SDave Kleikamp static void journal_fail_superblock (journal_t *journal) 1242470decc6SDave Kleikamp { 1243470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1244470decc6SDave Kleikamp brelse(bh); 1245470decc6SDave Kleikamp journal->j_sb_buffer = NULL; 1246470decc6SDave Kleikamp } 1247470decc6SDave Kleikamp 1248470decc6SDave Kleikamp /* 1249470decc6SDave Kleikamp * Given a journal_t structure, initialise the various fields for 1250470decc6SDave Kleikamp * startup of a new journaling session. We use this both when creating 1251470decc6SDave Kleikamp * a journal, and after recovering an old journal to reset it for 1252470decc6SDave Kleikamp * subsequent use. 1253470decc6SDave Kleikamp */ 1254470decc6SDave Kleikamp 1255470decc6SDave Kleikamp static int journal_reset(journal_t *journal) 1256470decc6SDave Kleikamp { 1257470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 125818eba7aaSMingming Cao unsigned long long first, last; 1259470decc6SDave Kleikamp 1260470decc6SDave Kleikamp first = be32_to_cpu(sb->s_first); 1261470decc6SDave Kleikamp last = be32_to_cpu(sb->s_maxlen); 1262f6f50e28SJan Kara if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { 1263f2a44523SEryu Guan printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu).\n", 1264f6f50e28SJan Kara first, last); 1265f6f50e28SJan Kara journal_fail_superblock(journal); 1266f6f50e28SJan Kara return -EINVAL; 1267f6f50e28SJan Kara } 1268470decc6SDave Kleikamp 1269470decc6SDave Kleikamp journal->j_first = first; 1270470decc6SDave Kleikamp journal->j_last = last; 1271470decc6SDave Kleikamp 1272470decc6SDave Kleikamp journal->j_head = first; 1273470decc6SDave Kleikamp journal->j_tail = first; 1274470decc6SDave Kleikamp journal->j_free = last - first; 1275470decc6SDave Kleikamp 1276470decc6SDave Kleikamp journal->j_tail_sequence = journal->j_transaction_sequence; 1277470decc6SDave Kleikamp journal->j_commit_sequence = journal->j_transaction_sequence - 1; 1278470decc6SDave Kleikamp journal->j_commit_request = journal->j_commit_sequence; 1279470decc6SDave Kleikamp 1280470decc6SDave Kleikamp journal->j_max_transaction_buffers = journal->j_maxlen / 4; 1281470decc6SDave Kleikamp 1282470decc6SDave Kleikamp /* 1283470decc6SDave Kleikamp * As a special case, if the on-disk copy is already marked as needing 128424bcc89cSJan Kara * no recovery (s_start == 0), then we can safely defer the superblock 128524bcc89cSJan Kara * update until the next commit by setting JBD2_FLUSHED. This avoids 1286470decc6SDave Kleikamp * attempting a write to a potential-readonly device. 1287470decc6SDave Kleikamp */ 128824bcc89cSJan Kara if (sb->s_start == 0) { 1289f2a44523SEryu Guan jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " 1290470decc6SDave Kleikamp "(start %ld, seq %d, errno %d)\n", 1291470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, 1292470decc6SDave Kleikamp journal->j_errno); 129324bcc89cSJan Kara journal->j_flags |= JBD2_FLUSHED; 129424bcc89cSJan Kara } else { 1295a78bb11dSJan Kara /* Lock here to make assertions happy... */ 1296a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 129779feb521SJan Kara /* 129879feb521SJan Kara * Update log tail information. We use WRITE_FUA since new 129979feb521SJan Kara * transaction will start reusing journal space and so we 130079feb521SJan Kara * must make sure information about current log tail is on 130179feb521SJan Kara * disk before that. 130279feb521SJan Kara */ 130379feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, 130479feb521SJan Kara journal->j_tail_sequence, 130579feb521SJan Kara journal->j_tail, 130679feb521SJan Kara WRITE_FUA); 1307a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 130824bcc89cSJan Kara } 130924bcc89cSJan Kara return jbd2_journal_start_thread(journal); 1310470decc6SDave Kleikamp } 1311470decc6SDave Kleikamp 131279feb521SJan Kara static void jbd2_write_superblock(journal_t *journal, int write_op) 131324bcc89cSJan Kara { 131424bcc89cSJan Kara struct buffer_head *bh = journal->j_sb_buffer; 131579feb521SJan Kara int ret; 131624bcc89cSJan Kara 131779feb521SJan Kara trace_jbd2_write_superblock(journal, write_op); 131879feb521SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 131979feb521SJan Kara write_op &= ~(REQ_FUA | REQ_FLUSH); 132079feb521SJan Kara lock_buffer(bh); 1321914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1322914258bfSTheodore Ts'o /* 1323914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the journal 1324914258bfSTheodore Ts'o * superblock failed. This could happen because the 1325914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 1326914258bfSTheodore Ts'o * be a transient write error and maybe the block will 1327914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 1328914258bfSTheodore Ts'o * write and hope for the best. 1329914258bfSTheodore Ts'o */ 1330914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: previous I/O error detected " 1331914258bfSTheodore Ts'o "for journal superblock update for %s.\n", 1332914258bfSTheodore Ts'o journal->j_devname); 1333914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1334914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1335914258bfSTheodore Ts'o } 133679feb521SJan Kara get_bh(bh); 133779feb521SJan Kara bh->b_end_io = end_buffer_write_sync; 133879feb521SJan Kara ret = submit_bh(write_op, bh); 133979feb521SJan Kara wait_on_buffer(bh); 1340914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1341914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1342914258bfSTheodore Ts'o set_buffer_uptodate(bh); 134379feb521SJan Kara ret = -EIO; 134479feb521SJan Kara } 134579feb521SJan Kara if (ret) { 134679feb521SJan Kara printk(KERN_ERR "JBD2: Error %d detected when updating " 134779feb521SJan Kara "journal superblock for %s.\n", ret, 134879feb521SJan Kara journal->j_devname); 1349914258bfSTheodore Ts'o } 135024bcc89cSJan Kara } 1351470decc6SDave Kleikamp 135224bcc89cSJan Kara /** 135324bcc89cSJan Kara * jbd2_journal_update_sb_log_tail() - Update log tail in journal sb on disk. 135424bcc89cSJan Kara * @journal: The journal to update. 135579feb521SJan Kara * @tail_tid: TID of the new transaction at the tail of the log 135679feb521SJan Kara * @tail_block: The first block of the transaction at the tail of the log 135779feb521SJan Kara * @write_op: With which operation should we write the journal sb 135824bcc89cSJan Kara * 135924bcc89cSJan Kara * Update a journal's superblock information about log tail and write it to 136024bcc89cSJan Kara * disk, waiting for the IO to complete. 136124bcc89cSJan Kara */ 136279feb521SJan Kara void jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid, 136379feb521SJan Kara unsigned long tail_block, int write_op) 136424bcc89cSJan Kara { 136524bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 13662201c590SSeiji Aguchi 1367a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 136879feb521SJan Kara jbd_debug(1, "JBD2: updating superblock (start %lu, seq %u)\n", 136979feb521SJan Kara tail_block, tail_tid); 1370470decc6SDave Kleikamp 137179feb521SJan Kara sb->s_sequence = cpu_to_be32(tail_tid); 137279feb521SJan Kara sb->s_start = cpu_to_be32(tail_block); 137324bcc89cSJan Kara 137479feb521SJan Kara jbd2_write_superblock(journal, write_op); 137524bcc89cSJan Kara 137624bcc89cSJan Kara /* Log is no longer empty */ 1377a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 137824bcc89cSJan Kara WARN_ON(!sb->s_sequence); 1379f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_FLUSHED; 138024bcc89cSJan Kara write_unlock(&journal->j_state_lock); 138124bcc89cSJan Kara } 138224bcc89cSJan Kara 138324bcc89cSJan Kara /** 138424bcc89cSJan Kara * jbd2_mark_journal_empty() - Mark on disk journal as empty. 138524bcc89cSJan Kara * @journal: The journal to update. 138624bcc89cSJan Kara * 138724bcc89cSJan Kara * Update a journal's dynamic superblock fields to show that journal is empty. 138824bcc89cSJan Kara * Write updated superblock to disk waiting for IO to complete. 138924bcc89cSJan Kara */ 139024bcc89cSJan Kara static void jbd2_mark_journal_empty(journal_t *journal) 139124bcc89cSJan Kara { 139224bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 139324bcc89cSJan Kara 1394a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 1395470decc6SDave Kleikamp read_lock(&journal->j_state_lock); 1396eeecef0aSEric Sandeen /* Is it already empty? */ 1397eeecef0aSEric Sandeen if (sb->s_start == 0) { 1398eeecef0aSEric Sandeen read_unlock(&journal->j_state_lock); 1399eeecef0aSEric Sandeen return; 1400eeecef0aSEric Sandeen } 140124bcc89cSJan Kara jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n", 140224bcc89cSJan Kara journal->j_tail_sequence); 1403470decc6SDave Kleikamp 1404470decc6SDave Kleikamp sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 140524bcc89cSJan Kara sb->s_start = cpu_to_be32(0); 140624bcc89cSJan Kara read_unlock(&journal->j_state_lock); 140724bcc89cSJan Kara 140879feb521SJan Kara jbd2_write_superblock(journal, WRITE_FUA); 140924bcc89cSJan Kara 141024bcc89cSJan Kara /* Log is no longer empty */ 141124bcc89cSJan Kara write_lock(&journal->j_state_lock); 1412f7f4bccbSMingming Cao journal->j_flags |= JBD2_FLUSHED; 1413a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1414470decc6SDave Kleikamp } 1415470decc6SDave Kleikamp 141624bcc89cSJan Kara 141724bcc89cSJan Kara /** 141824bcc89cSJan Kara * jbd2_journal_update_sb_errno() - Update error in the journal. 141924bcc89cSJan Kara * @journal: The journal to update. 142024bcc89cSJan Kara * 142124bcc89cSJan Kara * Update a journal's errno. Write updated superblock to disk waiting for IO 142224bcc89cSJan Kara * to complete. 142324bcc89cSJan Kara */ 1424d796c52eSTheodore Ts'o void jbd2_journal_update_sb_errno(journal_t *journal) 142524bcc89cSJan Kara { 142624bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 142724bcc89cSJan Kara 142824bcc89cSJan Kara read_lock(&journal->j_state_lock); 142924bcc89cSJan Kara jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", 143024bcc89cSJan Kara journal->j_errno); 1431470decc6SDave Kleikamp sb->s_errno = cpu_to_be32(journal->j_errno); 14324fd5ea43SDarrick J. Wong jbd2_superblock_csum_set(journal, sb); 1433470decc6SDave Kleikamp read_unlock(&journal->j_state_lock); 1434470decc6SDave Kleikamp 143579feb521SJan Kara jbd2_write_superblock(journal, WRITE_SYNC); 1436470decc6SDave Kleikamp } 1437d796c52eSTheodore Ts'o EXPORT_SYMBOL(jbd2_journal_update_sb_errno); 1438470decc6SDave Kleikamp 1439470decc6SDave Kleikamp /* 1440470decc6SDave Kleikamp * Read the superblock for a given journal, performing initial 1441470decc6SDave Kleikamp * validation of the format. 1442470decc6SDave Kleikamp */ 1443470decc6SDave Kleikamp static int journal_get_superblock(journal_t *journal) 1444470decc6SDave Kleikamp { 1445470decc6SDave Kleikamp struct buffer_head *bh; 1446470decc6SDave Kleikamp journal_superblock_t *sb; 1447470decc6SDave Kleikamp int err = -EIO; 1448470decc6SDave Kleikamp 1449470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1450470decc6SDave Kleikamp 1451470decc6SDave Kleikamp J_ASSERT(bh != NULL); 1452470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1453470decc6SDave Kleikamp ll_rw_block(READ, 1, &bh); 1454470decc6SDave Kleikamp wait_on_buffer(bh); 1455470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1456470decc6SDave Kleikamp printk(KERN_ERR 1457f2a44523SEryu Guan "JBD2: IO error reading journal superblock\n"); 1458470decc6SDave Kleikamp goto out; 1459470decc6SDave Kleikamp } 1460470decc6SDave Kleikamp } 1461470decc6SDave Kleikamp 146225ed6e8aSDarrick J. Wong if (buffer_verified(bh)) 146325ed6e8aSDarrick J. Wong return 0; 146425ed6e8aSDarrick J. Wong 1465470decc6SDave Kleikamp sb = journal->j_superblock; 1466470decc6SDave Kleikamp 1467470decc6SDave Kleikamp err = -EINVAL; 1468470decc6SDave Kleikamp 1469f7f4bccbSMingming Cao if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || 1470470decc6SDave Kleikamp sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { 1471f2a44523SEryu Guan printk(KERN_WARNING "JBD2: no valid journal superblock found\n"); 1472470decc6SDave Kleikamp goto out; 1473470decc6SDave Kleikamp } 1474470decc6SDave Kleikamp 1475470decc6SDave Kleikamp switch(be32_to_cpu(sb->s_header.h_blocktype)) { 1476f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1477470decc6SDave Kleikamp journal->j_format_version = 1; 1478470decc6SDave Kleikamp break; 1479f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1480470decc6SDave Kleikamp journal->j_format_version = 2; 1481470decc6SDave Kleikamp break; 1482470decc6SDave Kleikamp default: 1483f2a44523SEryu Guan printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n"); 1484470decc6SDave Kleikamp goto out; 1485470decc6SDave Kleikamp } 1486470decc6SDave Kleikamp 1487470decc6SDave Kleikamp if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) 1488470decc6SDave Kleikamp journal->j_maxlen = be32_to_cpu(sb->s_maxlen); 1489470decc6SDave Kleikamp else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { 1490f2a44523SEryu Guan printk(KERN_WARNING "JBD2: journal file too short\n"); 1491470decc6SDave Kleikamp goto out; 1492470decc6SDave Kleikamp } 1493470decc6SDave Kleikamp 14948762202dSEryu Guan if (be32_to_cpu(sb->s_first) == 0 || 14958762202dSEryu Guan be32_to_cpu(sb->s_first) >= journal->j_maxlen) { 14968762202dSEryu Guan printk(KERN_WARNING 14978762202dSEryu Guan "JBD2: Invalid start block of journal: %u\n", 14988762202dSEryu Guan be32_to_cpu(sb->s_first)); 14998762202dSEryu Guan goto out; 15008762202dSEryu Guan } 15018762202dSEryu Guan 150225ed6e8aSDarrick J. Wong if (JBD2_HAS_COMPAT_FEATURE(journal, JBD2_FEATURE_COMPAT_CHECKSUM) && 150325ed6e8aSDarrick J. Wong JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) { 150425ed6e8aSDarrick J. Wong /* Can't have checksum v1 and v2 on at the same time! */ 150525ed6e8aSDarrick J. Wong printk(KERN_ERR "JBD: Can't enable checksumming v1 and v2 " 150625ed6e8aSDarrick J. Wong "at the same time!\n"); 150725ed6e8aSDarrick J. Wong goto out; 150825ed6e8aSDarrick J. Wong } 150925ed6e8aSDarrick J. Wong 151025ed6e8aSDarrick J. Wong if (!jbd2_verify_csum_type(journal, sb)) { 151125ed6e8aSDarrick J. Wong printk(KERN_ERR "JBD: Unknown checksum type\n"); 151225ed6e8aSDarrick J. Wong goto out; 151325ed6e8aSDarrick J. Wong } 151425ed6e8aSDarrick J. Wong 151501b5adceSDarrick J. Wong /* Load the checksum driver */ 151601b5adceSDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) { 151701b5adceSDarrick J. Wong journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 151801b5adceSDarrick J. Wong if (IS_ERR(journal->j_chksum_driver)) { 151901b5adceSDarrick J. Wong printk(KERN_ERR "JBD: Cannot load crc32c driver.\n"); 152001b5adceSDarrick J. Wong err = PTR_ERR(journal->j_chksum_driver); 152101b5adceSDarrick J. Wong journal->j_chksum_driver = NULL; 152201b5adceSDarrick J. Wong goto out; 152301b5adceSDarrick J. Wong } 152401b5adceSDarrick J. Wong } 152501b5adceSDarrick J. Wong 15264fd5ea43SDarrick J. Wong /* Check superblock checksum */ 15274fd5ea43SDarrick J. Wong if (!jbd2_superblock_csum_verify(journal, sb)) { 15284fd5ea43SDarrick J. Wong printk(KERN_ERR "JBD: journal checksum error\n"); 15294fd5ea43SDarrick J. Wong goto out; 15304fd5ea43SDarrick J. Wong } 15314fd5ea43SDarrick J. Wong 15324fd5ea43SDarrick J. Wong /* Precompute checksum seed for all metadata */ 15334fd5ea43SDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) 15344fd5ea43SDarrick J. Wong journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid, 15354fd5ea43SDarrick J. Wong sizeof(sb->s_uuid)); 15364fd5ea43SDarrick J. Wong 153725ed6e8aSDarrick J. Wong set_buffer_verified(bh); 153825ed6e8aSDarrick J. Wong 1539470decc6SDave Kleikamp return 0; 1540470decc6SDave Kleikamp 1541470decc6SDave Kleikamp out: 1542470decc6SDave Kleikamp journal_fail_superblock(journal); 1543470decc6SDave Kleikamp return err; 1544470decc6SDave Kleikamp } 1545470decc6SDave Kleikamp 1546470decc6SDave Kleikamp /* 1547470decc6SDave Kleikamp * Load the on-disk journal superblock and read the key fields into the 1548470decc6SDave Kleikamp * journal_t. 1549470decc6SDave Kleikamp */ 1550470decc6SDave Kleikamp 1551470decc6SDave Kleikamp static int load_superblock(journal_t *journal) 1552470decc6SDave Kleikamp { 1553470decc6SDave Kleikamp int err; 1554470decc6SDave Kleikamp journal_superblock_t *sb; 1555470decc6SDave Kleikamp 1556470decc6SDave Kleikamp err = journal_get_superblock(journal); 1557470decc6SDave Kleikamp if (err) 1558470decc6SDave Kleikamp return err; 1559470decc6SDave Kleikamp 1560470decc6SDave Kleikamp sb = journal->j_superblock; 1561470decc6SDave Kleikamp 1562470decc6SDave Kleikamp journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); 1563470decc6SDave Kleikamp journal->j_tail = be32_to_cpu(sb->s_start); 1564470decc6SDave Kleikamp journal->j_first = be32_to_cpu(sb->s_first); 1565470decc6SDave Kleikamp journal->j_last = be32_to_cpu(sb->s_maxlen); 1566470decc6SDave Kleikamp journal->j_errno = be32_to_cpu(sb->s_errno); 1567470decc6SDave Kleikamp 1568470decc6SDave Kleikamp return 0; 1569470decc6SDave Kleikamp } 1570470decc6SDave Kleikamp 1571470decc6SDave Kleikamp 1572470decc6SDave Kleikamp /** 1573f7f4bccbSMingming Cao * int jbd2_journal_load() - Read journal from disk. 1574470decc6SDave Kleikamp * @journal: Journal to act on. 1575470decc6SDave Kleikamp * 1576470decc6SDave Kleikamp * Given a journal_t structure which tells us which disk blocks contain 1577470decc6SDave Kleikamp * a journal, read the journal from disk to initialise the in-memory 1578470decc6SDave Kleikamp * structures. 1579470decc6SDave Kleikamp */ 1580f7f4bccbSMingming Cao int jbd2_journal_load(journal_t *journal) 1581470decc6SDave Kleikamp { 1582470decc6SDave Kleikamp int err; 1583470decc6SDave Kleikamp journal_superblock_t *sb; 1584470decc6SDave Kleikamp 1585470decc6SDave Kleikamp err = load_superblock(journal); 1586470decc6SDave Kleikamp if (err) 1587470decc6SDave Kleikamp return err; 1588470decc6SDave Kleikamp 1589470decc6SDave Kleikamp sb = journal->j_superblock; 1590470decc6SDave Kleikamp /* If this is a V2 superblock, then we have to check the 1591470decc6SDave Kleikamp * features flags on it. */ 1592470decc6SDave Kleikamp 1593470decc6SDave Kleikamp if (journal->j_format_version >= 2) { 1594470decc6SDave Kleikamp if ((sb->s_feature_ro_compat & 1595f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || 1596470decc6SDave Kleikamp (sb->s_feature_incompat & 1597f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { 1598470decc6SDave Kleikamp printk(KERN_WARNING 1599f2a44523SEryu Guan "JBD2: Unrecognised features on journal\n"); 1600470decc6SDave Kleikamp return -EINVAL; 1601470decc6SDave Kleikamp } 1602470decc6SDave Kleikamp } 1603470decc6SDave Kleikamp 1604d2eecb03STheodore Ts'o /* 1605d2eecb03STheodore Ts'o * Create a slab for this blocksize 1606d2eecb03STheodore Ts'o */ 1607d2eecb03STheodore Ts'o err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); 1608d2eecb03STheodore Ts'o if (err) 1609d2eecb03STheodore Ts'o return err; 1610d2eecb03STheodore Ts'o 1611470decc6SDave Kleikamp /* Let the recovery code check whether it needs to recover any 1612470decc6SDave Kleikamp * data from the journal. */ 1613f7f4bccbSMingming Cao if (jbd2_journal_recover(journal)) 1614470decc6SDave Kleikamp goto recovery_error; 1615470decc6SDave Kleikamp 1616e6a47428STheodore Ts'o if (journal->j_failed_commit) { 1617e6a47428STheodore Ts'o printk(KERN_ERR "JBD2: journal transaction %u on %s " 1618e6a47428STheodore Ts'o "is corrupt.\n", journal->j_failed_commit, 1619e6a47428STheodore Ts'o journal->j_devname); 1620e6a47428STheodore Ts'o return -EIO; 1621e6a47428STheodore Ts'o } 1622e6a47428STheodore Ts'o 1623470decc6SDave Kleikamp /* OK, we've finished with the dynamic journal bits: 1624470decc6SDave Kleikamp * reinitialise the dynamic contents of the superblock in memory 1625470decc6SDave Kleikamp * and reset them on disk. */ 1626470decc6SDave Kleikamp if (journal_reset(journal)) 1627470decc6SDave Kleikamp goto recovery_error; 1628470decc6SDave Kleikamp 1629f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_ABORT; 1630f7f4bccbSMingming Cao journal->j_flags |= JBD2_LOADED; 1631470decc6SDave Kleikamp return 0; 1632470decc6SDave Kleikamp 1633470decc6SDave Kleikamp recovery_error: 1634f2a44523SEryu Guan printk(KERN_WARNING "JBD2: recovery failed\n"); 1635470decc6SDave Kleikamp return -EIO; 1636470decc6SDave Kleikamp } 1637470decc6SDave Kleikamp 1638470decc6SDave Kleikamp /** 1639f7f4bccbSMingming Cao * void jbd2_journal_destroy() - Release a journal_t structure. 1640470decc6SDave Kleikamp * @journal: Journal to act on. 1641470decc6SDave Kleikamp * 1642470decc6SDave Kleikamp * Release a journal_t structure once it is no longer in use by the 1643470decc6SDave Kleikamp * journaled object. 164444519fafSHidehiro Kawai * Return <0 if we couldn't clean up the journal. 1645470decc6SDave Kleikamp */ 164644519fafSHidehiro Kawai int jbd2_journal_destroy(journal_t *journal) 1647470decc6SDave Kleikamp { 164844519fafSHidehiro Kawai int err = 0; 164944519fafSHidehiro Kawai 1650470decc6SDave Kleikamp /* Wait for the commit thread to wake up and die. */ 1651470decc6SDave Kleikamp journal_kill_thread(journal); 1652470decc6SDave Kleikamp 1653470decc6SDave Kleikamp /* Force a final log commit */ 1654470decc6SDave Kleikamp if (journal->j_running_transaction) 1655f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 1656470decc6SDave Kleikamp 1657470decc6SDave Kleikamp /* Force any old transactions to disk */ 1658470decc6SDave Kleikamp 1659470decc6SDave Kleikamp /* Totally anal locking here... */ 1660470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1661470decc6SDave Kleikamp while (journal->j_checkpoint_transactions != NULL) { 1662470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 16631a0d3786STheodore Ts'o mutex_lock(&journal->j_checkpoint_mutex); 1664f7f4bccbSMingming Cao jbd2_log_do_checkpoint(journal); 16651a0d3786STheodore Ts'o mutex_unlock(&journal->j_checkpoint_mutex); 1666470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1667470decc6SDave Kleikamp } 1668470decc6SDave Kleikamp 1669470decc6SDave Kleikamp J_ASSERT(journal->j_running_transaction == NULL); 1670470decc6SDave Kleikamp J_ASSERT(journal->j_committing_transaction == NULL); 1671470decc6SDave Kleikamp J_ASSERT(journal->j_checkpoint_transactions == NULL); 1672470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 1673470decc6SDave Kleikamp 167444519fafSHidehiro Kawai if (journal->j_sb_buffer) { 167544519fafSHidehiro Kawai if (!is_journal_aborted(journal)) { 1676a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 167724bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1678a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1679a78bb11dSJan Kara } else 168044519fafSHidehiro Kawai err = -EIO; 1681470decc6SDave Kleikamp brelse(journal->j_sb_buffer); 1682470decc6SDave Kleikamp } 1683470decc6SDave Kleikamp 16848e85fb3fSJohann Lombardi if (journal->j_proc_entry) 16858e85fb3fSJohann Lombardi jbd2_stats_proc_exit(journal); 1686470decc6SDave Kleikamp if (journal->j_inode) 1687470decc6SDave Kleikamp iput(journal->j_inode); 1688470decc6SDave Kleikamp if (journal->j_revoke) 1689f7f4bccbSMingming Cao jbd2_journal_destroy_revoke(journal); 169001b5adceSDarrick J. Wong if (journal->j_chksum_driver) 169101b5adceSDarrick J. Wong crypto_free_shash(journal->j_chksum_driver); 1692470decc6SDave Kleikamp kfree(journal->j_wbuf); 1693470decc6SDave Kleikamp kfree(journal); 169444519fafSHidehiro Kawai 169544519fafSHidehiro Kawai return err; 1696470decc6SDave Kleikamp } 1697470decc6SDave Kleikamp 1698470decc6SDave Kleikamp 1699470decc6SDave Kleikamp /** 1700f7f4bccbSMingming Cao *int jbd2_journal_check_used_features () - Check if features specified are used. 1701470decc6SDave Kleikamp * @journal: Journal to check. 1702470decc6SDave Kleikamp * @compat: bitmask of compatible features 1703470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1704470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1705470decc6SDave Kleikamp * 1706470decc6SDave Kleikamp * Check whether the journal uses all of a given set of 1707470decc6SDave Kleikamp * features. Return true (non-zero) if it does. 1708470decc6SDave Kleikamp **/ 1709470decc6SDave Kleikamp 1710f7f4bccbSMingming Cao int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, 1711470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1712470decc6SDave Kleikamp { 1713470decc6SDave Kleikamp journal_superblock_t *sb; 1714470decc6SDave Kleikamp 1715470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1716470decc6SDave Kleikamp return 1; 17171113e1b5SPatrick J. LoPresti /* Load journal superblock if it is not loaded yet. */ 17181113e1b5SPatrick J. LoPresti if (journal->j_format_version == 0 && 17191113e1b5SPatrick J. LoPresti journal_get_superblock(journal) != 0) 17201113e1b5SPatrick J. LoPresti return 0; 1721470decc6SDave Kleikamp if (journal->j_format_version == 1) 1722470decc6SDave Kleikamp return 0; 1723470decc6SDave Kleikamp 1724470decc6SDave Kleikamp sb = journal->j_superblock; 1725470decc6SDave Kleikamp 1726470decc6SDave Kleikamp if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && 1727470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && 1728470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) 1729470decc6SDave Kleikamp return 1; 1730470decc6SDave Kleikamp 1731470decc6SDave Kleikamp return 0; 1732470decc6SDave Kleikamp } 1733470decc6SDave Kleikamp 1734470decc6SDave Kleikamp /** 1735f7f4bccbSMingming Cao * int jbd2_journal_check_available_features() - Check feature set in journalling layer 1736470decc6SDave Kleikamp * @journal: Journal to check. 1737470decc6SDave Kleikamp * @compat: bitmask of compatible features 1738470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1739470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1740470decc6SDave Kleikamp * 1741470decc6SDave Kleikamp * Check whether the journaling code supports the use of 1742470decc6SDave Kleikamp * all of a given set of features on this journal. Return true 1743470decc6SDave Kleikamp * (non-zero) if it can. */ 1744470decc6SDave Kleikamp 1745f7f4bccbSMingming Cao int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, 1746470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1747470decc6SDave Kleikamp { 1748470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1749470decc6SDave Kleikamp return 1; 1750470decc6SDave Kleikamp 1751470decc6SDave Kleikamp /* We can support any known requested features iff the 1752470decc6SDave Kleikamp * superblock is in version 2. Otherwise we fail to support any 1753470decc6SDave Kleikamp * extended sb features. */ 1754470decc6SDave Kleikamp 1755470decc6SDave Kleikamp if (journal->j_format_version != 2) 1756470decc6SDave Kleikamp return 0; 1757470decc6SDave Kleikamp 1758f7f4bccbSMingming Cao if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && 1759f7f4bccbSMingming Cao (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && 1760f7f4bccbSMingming Cao (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) 1761470decc6SDave Kleikamp return 1; 1762470decc6SDave Kleikamp 1763470decc6SDave Kleikamp return 0; 1764470decc6SDave Kleikamp } 1765470decc6SDave Kleikamp 1766470decc6SDave Kleikamp /** 1767f7f4bccbSMingming Cao * int jbd2_journal_set_features () - Mark a given journal feature in the superblock 1768470decc6SDave Kleikamp * @journal: Journal to act on. 1769470decc6SDave Kleikamp * @compat: bitmask of compatible features 1770470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1771470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1772470decc6SDave Kleikamp * 1773470decc6SDave Kleikamp * Mark a given journal feature as present on the 1774470decc6SDave Kleikamp * superblock. Returns true if the requested features could be set. 1775470decc6SDave Kleikamp * 1776470decc6SDave Kleikamp */ 1777470decc6SDave Kleikamp 1778f7f4bccbSMingming Cao int jbd2_journal_set_features (journal_t *journal, unsigned long compat, 1779470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1780470decc6SDave Kleikamp { 178125ed6e8aSDarrick J. Wong #define INCOMPAT_FEATURE_ON(f) \ 178225ed6e8aSDarrick J. Wong ((incompat & (f)) && !(sb->s_feature_incompat & cpu_to_be32(f))) 178325ed6e8aSDarrick J. Wong #define COMPAT_FEATURE_ON(f) \ 178425ed6e8aSDarrick J. Wong ((compat & (f)) && !(sb->s_feature_compat & cpu_to_be32(f))) 1785470decc6SDave Kleikamp journal_superblock_t *sb; 1786470decc6SDave Kleikamp 1787f7f4bccbSMingming Cao if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) 1788470decc6SDave Kleikamp return 1; 1789470decc6SDave Kleikamp 1790f7f4bccbSMingming Cao if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) 1791470decc6SDave Kleikamp return 0; 1792470decc6SDave Kleikamp 179325ed6e8aSDarrick J. Wong /* Asking for checksumming v2 and v1? Only give them v2. */ 179425ed6e8aSDarrick J. Wong if (incompat & JBD2_FEATURE_INCOMPAT_CSUM_V2 && 179525ed6e8aSDarrick J. Wong compat & JBD2_FEATURE_COMPAT_CHECKSUM) 179625ed6e8aSDarrick J. Wong compat &= ~JBD2_FEATURE_COMPAT_CHECKSUM; 179725ed6e8aSDarrick J. Wong 1798470decc6SDave Kleikamp jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", 1799470decc6SDave Kleikamp compat, ro, incompat); 1800470decc6SDave Kleikamp 1801470decc6SDave Kleikamp sb = journal->j_superblock; 1802470decc6SDave Kleikamp 180325ed6e8aSDarrick J. Wong /* If enabling v2 checksums, update superblock */ 180425ed6e8aSDarrick J. Wong if (INCOMPAT_FEATURE_ON(JBD2_FEATURE_INCOMPAT_CSUM_V2)) { 180525ed6e8aSDarrick J. Wong sb->s_checksum_type = JBD2_CRC32C_CHKSUM; 180625ed6e8aSDarrick J. Wong sb->s_feature_compat &= 180725ed6e8aSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM); 180801b5adceSDarrick J. Wong 180901b5adceSDarrick J. Wong /* Load the checksum driver */ 181001b5adceSDarrick J. Wong if (journal->j_chksum_driver == NULL) { 181101b5adceSDarrick J. Wong journal->j_chksum_driver = crypto_alloc_shash("crc32c", 181201b5adceSDarrick J. Wong 0, 0); 181301b5adceSDarrick J. Wong if (IS_ERR(journal->j_chksum_driver)) { 181401b5adceSDarrick J. Wong printk(KERN_ERR "JBD: Cannot load crc32c " 181501b5adceSDarrick J. Wong "driver.\n"); 181601b5adceSDarrick J. Wong journal->j_chksum_driver = NULL; 181701b5adceSDarrick J. Wong return 0; 181801b5adceSDarrick J. Wong } 181901b5adceSDarrick J. Wong } 18204fd5ea43SDarrick J. Wong 18214fd5ea43SDarrick J. Wong /* Precompute checksum seed for all metadata */ 18224fd5ea43SDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, 18234fd5ea43SDarrick J. Wong JBD2_FEATURE_INCOMPAT_CSUM_V2)) 18244fd5ea43SDarrick J. Wong journal->j_csum_seed = jbd2_chksum(journal, ~0, 18254fd5ea43SDarrick J. Wong sb->s_uuid, 18264fd5ea43SDarrick J. Wong sizeof(sb->s_uuid)); 182725ed6e8aSDarrick J. Wong } 182825ed6e8aSDarrick J. Wong 182925ed6e8aSDarrick J. Wong /* If enabling v1 checksums, downgrade superblock */ 183025ed6e8aSDarrick J. Wong if (COMPAT_FEATURE_ON(JBD2_FEATURE_COMPAT_CHECKSUM)) 183125ed6e8aSDarrick J. Wong sb->s_feature_incompat &= 183225ed6e8aSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2); 183325ed6e8aSDarrick J. Wong 1834470decc6SDave Kleikamp sb->s_feature_compat |= cpu_to_be32(compat); 1835470decc6SDave Kleikamp sb->s_feature_ro_compat |= cpu_to_be32(ro); 1836470decc6SDave Kleikamp sb->s_feature_incompat |= cpu_to_be32(incompat); 1837470decc6SDave Kleikamp 1838470decc6SDave Kleikamp return 1; 183925ed6e8aSDarrick J. Wong #undef COMPAT_FEATURE_ON 184025ed6e8aSDarrick J. Wong #undef INCOMPAT_FEATURE_ON 1841470decc6SDave Kleikamp } 1842470decc6SDave Kleikamp 1843818d276cSGirish Shilamkar /* 1844818d276cSGirish Shilamkar * jbd2_journal_clear_features () - Clear a given journal feature in the 1845818d276cSGirish Shilamkar * superblock 1846818d276cSGirish Shilamkar * @journal: Journal to act on. 1847818d276cSGirish Shilamkar * @compat: bitmask of compatible features 1848818d276cSGirish Shilamkar * @ro: bitmask of features that force read-only mount 1849818d276cSGirish Shilamkar * @incompat: bitmask of incompatible features 1850818d276cSGirish Shilamkar * 1851818d276cSGirish Shilamkar * Clear a given journal feature as present on the 1852818d276cSGirish Shilamkar * superblock. 1853818d276cSGirish Shilamkar */ 1854818d276cSGirish Shilamkar void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, 1855818d276cSGirish Shilamkar unsigned long ro, unsigned long incompat) 1856818d276cSGirish Shilamkar { 1857818d276cSGirish Shilamkar journal_superblock_t *sb; 1858818d276cSGirish Shilamkar 1859818d276cSGirish Shilamkar jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", 1860818d276cSGirish Shilamkar compat, ro, incompat); 1861818d276cSGirish Shilamkar 1862818d276cSGirish Shilamkar sb = journal->j_superblock; 1863818d276cSGirish Shilamkar 1864818d276cSGirish Shilamkar sb->s_feature_compat &= ~cpu_to_be32(compat); 1865818d276cSGirish Shilamkar sb->s_feature_ro_compat &= ~cpu_to_be32(ro); 1866818d276cSGirish Shilamkar sb->s_feature_incompat &= ~cpu_to_be32(incompat); 1867818d276cSGirish Shilamkar } 1868818d276cSGirish Shilamkar EXPORT_SYMBOL(jbd2_journal_clear_features); 1869470decc6SDave Kleikamp 1870470decc6SDave Kleikamp /** 1871f7f4bccbSMingming Cao * int jbd2_journal_flush () - Flush journal 1872470decc6SDave Kleikamp * @journal: Journal to act on. 1873470decc6SDave Kleikamp * 1874470decc6SDave Kleikamp * Flush all data for a given journal to disk and empty the journal. 1875470decc6SDave Kleikamp * Filesystems can use this when remounting readonly to ensure that 1876470decc6SDave Kleikamp * recovery does not need to happen on remount. 1877470decc6SDave Kleikamp */ 1878470decc6SDave Kleikamp 1879f7f4bccbSMingming Cao int jbd2_journal_flush(journal_t *journal) 1880470decc6SDave Kleikamp { 1881470decc6SDave Kleikamp int err = 0; 1882470decc6SDave Kleikamp transaction_t *transaction = NULL; 1883470decc6SDave Kleikamp 1884a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1885470decc6SDave Kleikamp 1886470decc6SDave Kleikamp /* Force everything buffered to the log... */ 1887470decc6SDave Kleikamp if (journal->j_running_transaction) { 1888470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1889f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1890470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 1891470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 1892470decc6SDave Kleikamp 1893470decc6SDave Kleikamp /* Wait for the log commit to complete... */ 1894470decc6SDave Kleikamp if (transaction) { 1895470decc6SDave Kleikamp tid_t tid = transaction->t_tid; 1896470decc6SDave Kleikamp 1897a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1898f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 1899470decc6SDave Kleikamp } else { 1900a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1901470decc6SDave Kleikamp } 1902470decc6SDave Kleikamp 1903470decc6SDave Kleikamp /* ...and flush everything in the log out to disk. */ 1904470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1905470decc6SDave Kleikamp while (!err && journal->j_checkpoint_transactions != NULL) { 1906470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 190744519fafSHidehiro Kawai mutex_lock(&journal->j_checkpoint_mutex); 1908f7f4bccbSMingming Cao err = jbd2_log_do_checkpoint(journal); 190944519fafSHidehiro Kawai mutex_unlock(&journal->j_checkpoint_mutex); 1910470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1911470decc6SDave Kleikamp } 1912470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 191344519fafSHidehiro Kawai 191444519fafSHidehiro Kawai if (is_journal_aborted(journal)) 191544519fafSHidehiro Kawai return -EIO; 191644519fafSHidehiro Kawai 1917a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 1918f7f4bccbSMingming Cao jbd2_cleanup_journal_tail(journal); 1919470decc6SDave Kleikamp 1920470decc6SDave Kleikamp /* Finally, mark the journal as really needing no recovery. 1921470decc6SDave Kleikamp * This sets s_start==0 in the underlying superblock, which is 1922470decc6SDave Kleikamp * the magic code for a fully-recovered superblock. Any future 1923470decc6SDave Kleikamp * commits of data to the journal will restore the current 1924470decc6SDave Kleikamp * s_start value. */ 192524bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1926a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1927a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1928470decc6SDave Kleikamp J_ASSERT(!journal->j_running_transaction); 1929470decc6SDave Kleikamp J_ASSERT(!journal->j_committing_transaction); 1930470decc6SDave Kleikamp J_ASSERT(!journal->j_checkpoint_transactions); 1931470decc6SDave Kleikamp J_ASSERT(journal->j_head == journal->j_tail); 1932470decc6SDave Kleikamp J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); 1933a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 193444519fafSHidehiro Kawai return 0; 1935470decc6SDave Kleikamp } 1936470decc6SDave Kleikamp 1937470decc6SDave Kleikamp /** 1938f7f4bccbSMingming Cao * int jbd2_journal_wipe() - Wipe journal contents 1939470decc6SDave Kleikamp * @journal: Journal to act on. 1940470decc6SDave Kleikamp * @write: flag (see below) 1941470decc6SDave Kleikamp * 1942470decc6SDave Kleikamp * Wipe out all of the contents of a journal, safely. This will produce 1943470decc6SDave Kleikamp * a warning if the journal contains any valid recovery information. 1944f7f4bccbSMingming Cao * Must be called between journal_init_*() and jbd2_journal_load(). 1945470decc6SDave Kleikamp * 1946470decc6SDave Kleikamp * If 'write' is non-zero, then we wipe out the journal on disk; otherwise 1947470decc6SDave Kleikamp * we merely suppress recovery. 1948470decc6SDave Kleikamp */ 1949470decc6SDave Kleikamp 1950f7f4bccbSMingming Cao int jbd2_journal_wipe(journal_t *journal, int write) 1951470decc6SDave Kleikamp { 1952470decc6SDave Kleikamp int err = 0; 1953470decc6SDave Kleikamp 1954f7f4bccbSMingming Cao J_ASSERT (!(journal->j_flags & JBD2_LOADED)); 1955470decc6SDave Kleikamp 1956470decc6SDave Kleikamp err = load_superblock(journal); 1957470decc6SDave Kleikamp if (err) 1958470decc6SDave Kleikamp return err; 1959470decc6SDave Kleikamp 1960470decc6SDave Kleikamp if (!journal->j_tail) 1961470decc6SDave Kleikamp goto no_recovery; 1962470decc6SDave Kleikamp 1963f2a44523SEryu Guan printk(KERN_WARNING "JBD2: %s recovery information on journal\n", 1964470decc6SDave Kleikamp write ? "Clearing" : "Ignoring"); 1965470decc6SDave Kleikamp 1966f7f4bccbSMingming Cao err = jbd2_journal_skip_recovery(journal); 1967a78bb11dSJan Kara if (write) { 1968a78bb11dSJan Kara /* Lock to make assertions happy... */ 1969a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 197024bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1971a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1972a78bb11dSJan Kara } 1973470decc6SDave Kleikamp 1974470decc6SDave Kleikamp no_recovery: 1975470decc6SDave Kleikamp return err; 1976470decc6SDave Kleikamp } 1977470decc6SDave Kleikamp 1978470decc6SDave Kleikamp /* 1979470decc6SDave Kleikamp * Journal abort has very specific semantics, which we describe 1980470decc6SDave Kleikamp * for journal abort. 1981470decc6SDave Kleikamp * 1982bfcd3555SAlberto Bertogli * Two internal functions, which provide abort to the jbd layer 1983470decc6SDave Kleikamp * itself are here. 1984470decc6SDave Kleikamp */ 1985470decc6SDave Kleikamp 1986470decc6SDave Kleikamp /* 1987470decc6SDave Kleikamp * Quick version for internal journal use (doesn't lock the journal). 1988470decc6SDave Kleikamp * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, 1989470decc6SDave Kleikamp * and don't attempt to make any other journal updates. 1990470decc6SDave Kleikamp */ 1991f7f4bccbSMingming Cao void __jbd2_journal_abort_hard(journal_t *journal) 1992470decc6SDave Kleikamp { 1993470decc6SDave Kleikamp transaction_t *transaction; 1994470decc6SDave Kleikamp 1995f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 1996470decc6SDave Kleikamp return; 1997470decc6SDave Kleikamp 1998470decc6SDave Kleikamp printk(KERN_ERR "Aborting journal on device %s.\n", 199905496769STheodore Ts'o journal->j_devname); 2000470decc6SDave Kleikamp 2001a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2002f7f4bccbSMingming Cao journal->j_flags |= JBD2_ABORT; 2003470decc6SDave Kleikamp transaction = journal->j_running_transaction; 2004470decc6SDave Kleikamp if (transaction) 2005f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 2006a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2007470decc6SDave Kleikamp } 2008470decc6SDave Kleikamp 2009470decc6SDave Kleikamp /* Soft abort: record the abort error status in the journal superblock, 2010470decc6SDave Kleikamp * but don't do any other IO. */ 2011470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno) 2012470decc6SDave Kleikamp { 2013f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2014470decc6SDave Kleikamp return; 2015470decc6SDave Kleikamp 2016470decc6SDave Kleikamp if (!journal->j_errno) 2017470decc6SDave Kleikamp journal->j_errno = errno; 2018470decc6SDave Kleikamp 2019f7f4bccbSMingming Cao __jbd2_journal_abort_hard(journal); 2020470decc6SDave Kleikamp 2021470decc6SDave Kleikamp if (errno) 202224bcc89cSJan Kara jbd2_journal_update_sb_errno(journal); 2023470decc6SDave Kleikamp } 2024470decc6SDave Kleikamp 2025470decc6SDave Kleikamp /** 2026f7f4bccbSMingming Cao * void jbd2_journal_abort () - Shutdown the journal immediately. 2027470decc6SDave Kleikamp * @journal: the journal to shutdown. 2028470decc6SDave Kleikamp * @errno: an error number to record in the journal indicating 2029470decc6SDave Kleikamp * the reason for the shutdown. 2030470decc6SDave Kleikamp * 2031470decc6SDave Kleikamp * Perform a complete, immediate shutdown of the ENTIRE 2032470decc6SDave Kleikamp * journal (not of a single transaction). This operation cannot be 2033470decc6SDave Kleikamp * undone without closing and reopening the journal. 2034470decc6SDave Kleikamp * 2035f7f4bccbSMingming Cao * The jbd2_journal_abort function is intended to support higher level error 2036470decc6SDave Kleikamp * recovery mechanisms such as the ext2/ext3 remount-readonly error 2037470decc6SDave Kleikamp * mode. 2038470decc6SDave Kleikamp * 2039470decc6SDave Kleikamp * Journal abort has very specific semantics. Any existing dirty, 2040470decc6SDave Kleikamp * unjournaled buffers in the main filesystem will still be written to 2041470decc6SDave Kleikamp * disk by bdflush, but the journaling mechanism will be suspended 2042470decc6SDave Kleikamp * immediately and no further transaction commits will be honoured. 2043470decc6SDave Kleikamp * 2044470decc6SDave Kleikamp * Any dirty, journaled buffers will be written back to disk without 2045470decc6SDave Kleikamp * hitting the journal. Atomicity cannot be guaranteed on an aborted 2046470decc6SDave Kleikamp * filesystem, but we _do_ attempt to leave as much data as possible 2047470decc6SDave Kleikamp * behind for fsck to use for cleanup. 2048470decc6SDave Kleikamp * 2049470decc6SDave Kleikamp * Any attempt to get a new transaction handle on a journal which is in 2050470decc6SDave Kleikamp * ABORT state will just result in an -EROFS error return. A 2051f7f4bccbSMingming Cao * jbd2_journal_stop on an existing handle will return -EIO if we have 2052470decc6SDave Kleikamp * entered abort state during the update. 2053470decc6SDave Kleikamp * 2054470decc6SDave Kleikamp * Recursive transactions are not disturbed by journal abort until the 2055f7f4bccbSMingming Cao * final jbd2_journal_stop, which will receive the -EIO error. 2056470decc6SDave Kleikamp * 2057f7f4bccbSMingming Cao * Finally, the jbd2_journal_abort call allows the caller to supply an errno 2058470decc6SDave Kleikamp * which will be recorded (if possible) in the journal superblock. This 2059470decc6SDave Kleikamp * allows a client to record failure conditions in the middle of a 2060470decc6SDave Kleikamp * transaction without having to complete the transaction to record the 2061470decc6SDave Kleikamp * failure to disk. ext3_error, for example, now uses this 2062470decc6SDave Kleikamp * functionality. 2063470decc6SDave Kleikamp * 2064470decc6SDave Kleikamp * Errors which originate from within the journaling layer will NOT 2065470decc6SDave Kleikamp * supply an errno; a null errno implies that absolutely no further 2066470decc6SDave Kleikamp * writes are done to the journal (unless there are any already in 2067470decc6SDave Kleikamp * progress). 2068470decc6SDave Kleikamp * 2069470decc6SDave Kleikamp */ 2070470decc6SDave Kleikamp 2071f7f4bccbSMingming Cao void jbd2_journal_abort(journal_t *journal, int errno) 2072470decc6SDave Kleikamp { 2073470decc6SDave Kleikamp __journal_abort_soft(journal, errno); 2074470decc6SDave Kleikamp } 2075470decc6SDave Kleikamp 2076470decc6SDave Kleikamp /** 2077f7f4bccbSMingming Cao * int jbd2_journal_errno () - returns the journal's error state. 2078470decc6SDave Kleikamp * @journal: journal to examine. 2079470decc6SDave Kleikamp * 2080bfcd3555SAlberto Bertogli * This is the errno number set with jbd2_journal_abort(), the last 2081470decc6SDave Kleikamp * time the journal was mounted - if the journal was stopped 2082470decc6SDave Kleikamp * without calling abort this will be 0. 2083470decc6SDave Kleikamp * 2084470decc6SDave Kleikamp * If the journal has been aborted on this mount time -EROFS will 2085470decc6SDave Kleikamp * be returned. 2086470decc6SDave Kleikamp */ 2087f7f4bccbSMingming Cao int jbd2_journal_errno(journal_t *journal) 2088470decc6SDave Kleikamp { 2089470decc6SDave Kleikamp int err; 2090470decc6SDave Kleikamp 2091a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 2092f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2093470decc6SDave Kleikamp err = -EROFS; 2094470decc6SDave Kleikamp else 2095470decc6SDave Kleikamp err = journal->j_errno; 2096a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 2097470decc6SDave Kleikamp return err; 2098470decc6SDave Kleikamp } 2099470decc6SDave Kleikamp 2100470decc6SDave Kleikamp /** 2101f7f4bccbSMingming Cao * int jbd2_journal_clear_err () - clears the journal's error state 2102470decc6SDave Kleikamp * @journal: journal to act on. 2103470decc6SDave Kleikamp * 2104bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 2105470decc6SDave Kleikamp * mode. 2106470decc6SDave Kleikamp */ 2107f7f4bccbSMingming Cao int jbd2_journal_clear_err(journal_t *journal) 2108470decc6SDave Kleikamp { 2109470decc6SDave Kleikamp int err = 0; 2110470decc6SDave Kleikamp 2111a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2112f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2113470decc6SDave Kleikamp err = -EROFS; 2114470decc6SDave Kleikamp else 2115470decc6SDave Kleikamp journal->j_errno = 0; 2116a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2117470decc6SDave Kleikamp return err; 2118470decc6SDave Kleikamp } 2119470decc6SDave Kleikamp 2120470decc6SDave Kleikamp /** 2121f7f4bccbSMingming Cao * void jbd2_journal_ack_err() - Ack journal err. 2122470decc6SDave Kleikamp * @journal: journal to act on. 2123470decc6SDave Kleikamp * 2124bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 2125470decc6SDave Kleikamp * mode. 2126470decc6SDave Kleikamp */ 2127f7f4bccbSMingming Cao void jbd2_journal_ack_err(journal_t *journal) 2128470decc6SDave Kleikamp { 2129a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2130470decc6SDave Kleikamp if (journal->j_errno) 2131f7f4bccbSMingming Cao journal->j_flags |= JBD2_ACK_ERR; 2132a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2133470decc6SDave Kleikamp } 2134470decc6SDave Kleikamp 2135f7f4bccbSMingming Cao int jbd2_journal_blocks_per_page(struct inode *inode) 2136470decc6SDave Kleikamp { 2137470decc6SDave Kleikamp return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 2138470decc6SDave Kleikamp } 2139470decc6SDave Kleikamp 2140470decc6SDave Kleikamp /* 2141b517bea1SZach Brown * helper functions to deal with 32 or 64bit block numbers. 2142b517bea1SZach Brown */ 2143b517bea1SZach Brown size_t journal_tag_bytes(journal_t *journal) 2144b517bea1SZach Brown { 2145c3900875SDarrick J. Wong journal_block_tag_t tag; 2146c3900875SDarrick J. Wong size_t x = 0; 2147c3900875SDarrick J. Wong 2148c3900875SDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) 2149c3900875SDarrick J. Wong x += sizeof(tag.t_checksum); 2150c3900875SDarrick J. Wong 2151b517bea1SZach Brown if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) 2152c3900875SDarrick J. Wong return x + JBD2_TAG_SIZE64; 2153b517bea1SZach Brown else 2154c3900875SDarrick J. Wong return x + JBD2_TAG_SIZE32; 2155b517bea1SZach Brown } 2156b517bea1SZach Brown 2157b517bea1SZach Brown /* 2158d2eecb03STheodore Ts'o * JBD memory management 2159d2eecb03STheodore Ts'o * 2160d2eecb03STheodore Ts'o * These functions are used to allocate block-sized chunks of memory 2161d2eecb03STheodore Ts'o * used for making copies of buffer_head data. Very often it will be 2162d2eecb03STheodore Ts'o * page-sized chunks of data, but sometimes it will be in 2163d2eecb03STheodore Ts'o * sub-page-size chunks. (For example, 16k pages on Power systems 2164d2eecb03STheodore Ts'o * with a 4k block file system.) For blocks smaller than a page, we 2165d2eecb03STheodore Ts'o * use a SLAB allocator. There are slab caches for each block size, 2166d2eecb03STheodore Ts'o * which are allocated at mount time, if necessary, and we only free 2167d2eecb03STheodore Ts'o * (all of) the slab caches when/if the jbd2 module is unloaded. For 2168d2eecb03STheodore Ts'o * this reason we don't need to a mutex to protect access to 2169d2eecb03STheodore Ts'o * jbd2_slab[] allocating or releasing memory; only in 2170d2eecb03STheodore Ts'o * jbd2_journal_create_slab(). 2171d2eecb03STheodore Ts'o */ 2172d2eecb03STheodore Ts'o #define JBD2_MAX_SLABS 8 2173d2eecb03STheodore Ts'o static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; 2174d2eecb03STheodore Ts'o 2175d2eecb03STheodore Ts'o static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { 2176d2eecb03STheodore Ts'o "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", 2177d2eecb03STheodore Ts'o "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" 2178d2eecb03STheodore Ts'o }; 2179d2eecb03STheodore Ts'o 2180d2eecb03STheodore Ts'o 2181d2eecb03STheodore Ts'o static void jbd2_journal_destroy_slabs(void) 2182d2eecb03STheodore Ts'o { 2183d2eecb03STheodore Ts'o int i; 2184d2eecb03STheodore Ts'o 2185d2eecb03STheodore Ts'o for (i = 0; i < JBD2_MAX_SLABS; i++) { 2186d2eecb03STheodore Ts'o if (jbd2_slab[i]) 2187d2eecb03STheodore Ts'o kmem_cache_destroy(jbd2_slab[i]); 2188d2eecb03STheodore Ts'o jbd2_slab[i] = NULL; 2189d2eecb03STheodore Ts'o } 2190d2eecb03STheodore Ts'o } 2191d2eecb03STheodore Ts'o 2192d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t size) 2193d2eecb03STheodore Ts'o { 219451dfacdeSThomas Gleixner static DEFINE_MUTEX(jbd2_slab_create_mutex); 2195d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2196d2eecb03STheodore Ts'o size_t slab_size; 2197d2eecb03STheodore Ts'o 2198d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2199d2eecb03STheodore Ts'o return 0; 2200d2eecb03STheodore Ts'o 2201d2eecb03STheodore Ts'o if (i >= JBD2_MAX_SLABS) 2202d2eecb03STheodore Ts'o return -EINVAL; 2203d2eecb03STheodore Ts'o 2204d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2205d2eecb03STheodore Ts'o i = 0; 220651dfacdeSThomas Gleixner mutex_lock(&jbd2_slab_create_mutex); 2207d2eecb03STheodore Ts'o if (jbd2_slab[i]) { 220851dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2209d2eecb03STheodore Ts'o return 0; /* Already created */ 2210d2eecb03STheodore Ts'o } 2211d2eecb03STheodore Ts'o 2212d2eecb03STheodore Ts'o slab_size = 1 << (i+10); 2213d2eecb03STheodore Ts'o jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, 2214d2eecb03STheodore Ts'o slab_size, 0, NULL); 221551dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2216d2eecb03STheodore Ts'o if (!jbd2_slab[i]) { 2217d2eecb03STheodore Ts'o printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); 2218d2eecb03STheodore Ts'o return -ENOMEM; 2219d2eecb03STheodore Ts'o } 2220d2eecb03STheodore Ts'o return 0; 2221d2eecb03STheodore Ts'o } 2222d2eecb03STheodore Ts'o 2223d2eecb03STheodore Ts'o static struct kmem_cache *get_slab(size_t size) 2224d2eecb03STheodore Ts'o { 2225d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2226d2eecb03STheodore Ts'o 2227d2eecb03STheodore Ts'o BUG_ON(i >= JBD2_MAX_SLABS); 2228d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2229d2eecb03STheodore Ts'o i = 0; 22308ac97b74SBill Pemberton BUG_ON(jbd2_slab[i] == NULL); 2231d2eecb03STheodore Ts'o return jbd2_slab[i]; 2232d2eecb03STheodore Ts'o } 2233d2eecb03STheodore Ts'o 2234d2eecb03STheodore Ts'o void *jbd2_alloc(size_t size, gfp_t flags) 2235d2eecb03STheodore Ts'o { 2236d2eecb03STheodore Ts'o void *ptr; 2237d2eecb03STheodore Ts'o 2238d2eecb03STheodore Ts'o BUG_ON(size & (size-1)); /* Must be a power of 2 */ 2239d2eecb03STheodore Ts'o 2240d2eecb03STheodore Ts'o flags |= __GFP_REPEAT; 2241d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2242d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, 0); 2243d2eecb03STheodore Ts'o else if (size > PAGE_SIZE) { 2244d2eecb03STheodore Ts'o int order = get_order(size); 2245d2eecb03STheodore Ts'o 2246d2eecb03STheodore Ts'o if (order < 3) 2247d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, order); 2248d2eecb03STheodore Ts'o else 2249d2eecb03STheodore Ts'o ptr = vmalloc(size); 2250d2eecb03STheodore Ts'o } else 2251d2eecb03STheodore Ts'o ptr = kmem_cache_alloc(get_slab(size), flags); 2252d2eecb03STheodore Ts'o 2253d2eecb03STheodore Ts'o /* Check alignment; SLUB has gotten this wrong in the past, 2254d2eecb03STheodore Ts'o * and this can lead to user data corruption! */ 2255d2eecb03STheodore Ts'o BUG_ON(((unsigned long) ptr) & (size-1)); 2256d2eecb03STheodore Ts'o 2257d2eecb03STheodore Ts'o return ptr; 2258d2eecb03STheodore Ts'o } 2259d2eecb03STheodore Ts'o 2260d2eecb03STheodore Ts'o void jbd2_free(void *ptr, size_t size) 2261d2eecb03STheodore Ts'o { 2262d2eecb03STheodore Ts'o if (size == PAGE_SIZE) { 2263d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, 0); 2264d2eecb03STheodore Ts'o return; 2265d2eecb03STheodore Ts'o } 2266d2eecb03STheodore Ts'o if (size > PAGE_SIZE) { 2267d2eecb03STheodore Ts'o int order = get_order(size); 2268d2eecb03STheodore Ts'o 2269d2eecb03STheodore Ts'o if (order < 3) 2270d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, order); 2271d2eecb03STheodore Ts'o else 2272d2eecb03STheodore Ts'o vfree(ptr); 2273d2eecb03STheodore Ts'o return; 2274d2eecb03STheodore Ts'o } 2275d2eecb03STheodore Ts'o kmem_cache_free(get_slab(size), ptr); 2276d2eecb03STheodore Ts'o }; 2277d2eecb03STheodore Ts'o 2278d2eecb03STheodore Ts'o /* 2279470decc6SDave Kleikamp * Journal_head storage management 2280470decc6SDave Kleikamp */ 2281e18b890bSChristoph Lameter static struct kmem_cache *jbd2_journal_head_cache; 2282e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2283470decc6SDave Kleikamp static atomic_t nr_journal_heads = ATOMIC_INIT(0); 2284470decc6SDave Kleikamp #endif 2285470decc6SDave Kleikamp 22864185a2acSYongqiang Yang static int jbd2_journal_init_journal_head_cache(void) 2287470decc6SDave Kleikamp { 2288470decc6SDave Kleikamp int retval; 2289470decc6SDave Kleikamp 22901076d17aSAl Viro J_ASSERT(jbd2_journal_head_cache == NULL); 2291a920e941SJohann Lombardi jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", 2292470decc6SDave Kleikamp sizeof(struct journal_head), 2293470decc6SDave Kleikamp 0, /* offset */ 229477160957SMingming Cao SLAB_TEMPORARY, /* flags */ 229520c2df83SPaul Mundt NULL); /* ctor */ 2296470decc6SDave Kleikamp retval = 0; 22971076d17aSAl Viro if (!jbd2_journal_head_cache) { 2298470decc6SDave Kleikamp retval = -ENOMEM; 2299f2a44523SEryu Guan printk(KERN_EMERG "JBD2: no memory for journal_head cache\n"); 2300470decc6SDave Kleikamp } 2301470decc6SDave Kleikamp return retval; 2302470decc6SDave Kleikamp } 2303470decc6SDave Kleikamp 23044185a2acSYongqiang Yang static void jbd2_journal_destroy_journal_head_cache(void) 2305470decc6SDave Kleikamp { 23068a9362ebSDuane Griffin if (jbd2_journal_head_cache) { 2307f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_journal_head_cache); 2308f7f4bccbSMingming Cao jbd2_journal_head_cache = NULL; 2309470decc6SDave Kleikamp } 23108a9362ebSDuane Griffin } 2311470decc6SDave Kleikamp 2312470decc6SDave Kleikamp /* 2313470decc6SDave Kleikamp * journal_head splicing and dicing 2314470decc6SDave Kleikamp */ 2315470decc6SDave Kleikamp static struct journal_head *journal_alloc_journal_head(void) 2316470decc6SDave Kleikamp { 2317470decc6SDave Kleikamp struct journal_head *ret; 2318470decc6SDave Kleikamp 2319e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2320470decc6SDave Kleikamp atomic_inc(&nr_journal_heads); 2321470decc6SDave Kleikamp #endif 23225d9cf9c6SZheng Liu ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS); 23231076d17aSAl Viro if (!ret) { 2324470decc6SDave Kleikamp jbd_debug(1, "out of memory for journal_head\n"); 2325670be5a7STheodore Ts'o pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__); 23261076d17aSAl Viro while (!ret) { 2327470decc6SDave Kleikamp yield(); 23285d9cf9c6SZheng Liu ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS); 2329470decc6SDave Kleikamp } 2330470decc6SDave Kleikamp } 2331470decc6SDave Kleikamp return ret; 2332470decc6SDave Kleikamp } 2333470decc6SDave Kleikamp 2334470decc6SDave Kleikamp static void journal_free_journal_head(struct journal_head *jh) 2335470decc6SDave Kleikamp { 2336e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2337470decc6SDave Kleikamp atomic_dec(&nr_journal_heads); 2338cd02ff0bSMingming Cao memset(jh, JBD2_POISON_FREE, sizeof(*jh)); 2339470decc6SDave Kleikamp #endif 2340f7f4bccbSMingming Cao kmem_cache_free(jbd2_journal_head_cache, jh); 2341470decc6SDave Kleikamp } 2342470decc6SDave Kleikamp 2343470decc6SDave Kleikamp /* 2344470decc6SDave Kleikamp * A journal_head is attached to a buffer_head whenever JBD has an 2345470decc6SDave Kleikamp * interest in the buffer. 2346470decc6SDave Kleikamp * 2347470decc6SDave Kleikamp * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit 2348470decc6SDave Kleikamp * is set. This bit is tested in core kernel code where we need to take 2349470decc6SDave Kleikamp * JBD-specific actions. Testing the zeroness of ->b_private is not reliable 2350470decc6SDave Kleikamp * there. 2351470decc6SDave Kleikamp * 2352470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. 2353470decc6SDave Kleikamp * 2354470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set it is immune from being released by 2355470decc6SDave Kleikamp * core kernel code, mainly via ->b_count. 2356470decc6SDave Kleikamp * 2357de1b7941SJan Kara * A journal_head is detached from its buffer_head when the journal_head's 2358de1b7941SJan Kara * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint 2359de1b7941SJan Kara * transaction (b_cp_transaction) hold their references to b_jcount. 2360470decc6SDave Kleikamp * 2361470decc6SDave Kleikamp * Various places in the kernel want to attach a journal_head to a buffer_head 2362470decc6SDave Kleikamp * _before_ attaching the journal_head to a transaction. To protect the 2363f7f4bccbSMingming Cao * journal_head in this situation, jbd2_journal_add_journal_head elevates the 2364470decc6SDave Kleikamp * journal_head's b_jcount refcount by one. The caller must call 2365f7f4bccbSMingming Cao * jbd2_journal_put_journal_head() to undo this. 2366470decc6SDave Kleikamp * 2367470decc6SDave Kleikamp * So the typical usage would be: 2368470decc6SDave Kleikamp * 2369470decc6SDave Kleikamp * (Attach a journal_head if needed. Increments b_jcount) 2370f7f4bccbSMingming Cao * struct journal_head *jh = jbd2_journal_add_journal_head(bh); 2371470decc6SDave Kleikamp * ... 2372de1b7941SJan Kara * (Get another reference for transaction) 2373de1b7941SJan Kara * jbd2_journal_grab_journal_head(bh); 2374470decc6SDave Kleikamp * jh->b_transaction = xxx; 2375de1b7941SJan Kara * (Put original reference) 2376f7f4bccbSMingming Cao * jbd2_journal_put_journal_head(jh); 2377470decc6SDave Kleikamp */ 2378470decc6SDave Kleikamp 2379470decc6SDave Kleikamp /* 2380470decc6SDave Kleikamp * Give a buffer_head a journal_head. 2381470decc6SDave Kleikamp * 2382470decc6SDave Kleikamp * May sleep. 2383470decc6SDave Kleikamp */ 2384f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) 2385470decc6SDave Kleikamp { 2386470decc6SDave Kleikamp struct journal_head *jh; 2387470decc6SDave Kleikamp struct journal_head *new_jh = NULL; 2388470decc6SDave Kleikamp 2389470decc6SDave Kleikamp repeat: 23905d9cf9c6SZheng Liu if (!buffer_jbd(bh)) 2391470decc6SDave Kleikamp new_jh = journal_alloc_journal_head(); 2392470decc6SDave Kleikamp 2393470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2394470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2395470decc6SDave Kleikamp jh = bh2jh(bh); 2396470decc6SDave Kleikamp } else { 2397470decc6SDave Kleikamp J_ASSERT_BH(bh, 2398470decc6SDave Kleikamp (atomic_read(&bh->b_count) > 0) || 2399470decc6SDave Kleikamp (bh->b_page && bh->b_page->mapping)); 2400470decc6SDave Kleikamp 2401470decc6SDave Kleikamp if (!new_jh) { 2402470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2403470decc6SDave Kleikamp goto repeat; 2404470decc6SDave Kleikamp } 2405470decc6SDave Kleikamp 2406470decc6SDave Kleikamp jh = new_jh; 2407470decc6SDave Kleikamp new_jh = NULL; /* We consumed it */ 2408470decc6SDave Kleikamp set_buffer_jbd(bh); 2409470decc6SDave Kleikamp bh->b_private = jh; 2410470decc6SDave Kleikamp jh->b_bh = bh; 2411470decc6SDave Kleikamp get_bh(bh); 2412470decc6SDave Kleikamp BUFFER_TRACE(bh, "added journal_head"); 2413470decc6SDave Kleikamp } 2414470decc6SDave Kleikamp jh->b_jcount++; 2415470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2416470decc6SDave Kleikamp if (new_jh) 2417470decc6SDave Kleikamp journal_free_journal_head(new_jh); 2418470decc6SDave Kleikamp return bh->b_private; 2419470decc6SDave Kleikamp } 2420470decc6SDave Kleikamp 2421470decc6SDave Kleikamp /* 2422470decc6SDave Kleikamp * Grab a ref against this buffer_head's journal_head. If it ended up not 2423470decc6SDave Kleikamp * having a journal_head, return NULL 2424470decc6SDave Kleikamp */ 2425f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) 2426470decc6SDave Kleikamp { 2427470decc6SDave Kleikamp struct journal_head *jh = NULL; 2428470decc6SDave Kleikamp 2429470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2430470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2431470decc6SDave Kleikamp jh = bh2jh(bh); 2432470decc6SDave Kleikamp jh->b_jcount++; 2433470decc6SDave Kleikamp } 2434470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2435470decc6SDave Kleikamp return jh; 2436470decc6SDave Kleikamp } 2437470decc6SDave Kleikamp 2438470decc6SDave Kleikamp static void __journal_remove_journal_head(struct buffer_head *bh) 2439470decc6SDave Kleikamp { 2440470decc6SDave Kleikamp struct journal_head *jh = bh2jh(bh); 2441470decc6SDave Kleikamp 2442470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount >= 0); 2443de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_transaction == NULL); 2444de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_next_transaction == NULL); 2445de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); 2446470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jlist == BJ_None); 2447470decc6SDave Kleikamp J_ASSERT_BH(bh, buffer_jbd(bh)); 2448470decc6SDave Kleikamp J_ASSERT_BH(bh, jh2bh(jh) == bh); 2449470decc6SDave Kleikamp BUFFER_TRACE(bh, "remove journal_head"); 2450470decc6SDave Kleikamp if (jh->b_frozen_data) { 2451de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__); 2452af1e76d6SMingming Cao jbd2_free(jh->b_frozen_data, bh->b_size); 2453470decc6SDave Kleikamp } 2454470decc6SDave Kleikamp if (jh->b_committed_data) { 2455de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__); 2456af1e76d6SMingming Cao jbd2_free(jh->b_committed_data, bh->b_size); 2457470decc6SDave Kleikamp } 2458470decc6SDave Kleikamp bh->b_private = NULL; 2459470decc6SDave Kleikamp jh->b_bh = NULL; /* debug, really */ 2460470decc6SDave Kleikamp clear_buffer_jbd(bh); 2461470decc6SDave Kleikamp journal_free_journal_head(jh); 2462470decc6SDave Kleikamp } 2463470decc6SDave Kleikamp 2464470decc6SDave Kleikamp /* 2465de1b7941SJan Kara * Drop a reference on the passed journal_head. If it fell to zero then 2466470decc6SDave Kleikamp * release the journal_head from the buffer_head. 2467470decc6SDave Kleikamp */ 2468f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh) 2469470decc6SDave Kleikamp { 2470470decc6SDave Kleikamp struct buffer_head *bh = jh2bh(jh); 2471470decc6SDave Kleikamp 2472470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2473470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount > 0); 2474470decc6SDave Kleikamp --jh->b_jcount; 2475de1b7941SJan Kara if (!jh->b_jcount) { 2476470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2477de1b7941SJan Kara jbd_unlock_bh_journal_head(bh); 2478470decc6SDave Kleikamp __brelse(bh); 2479de1b7941SJan Kara } else 2480470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2481470decc6SDave Kleikamp } 2482470decc6SDave Kleikamp 2483470decc6SDave Kleikamp /* 2484c851ed54SJan Kara * Initialize jbd inode head 2485c851ed54SJan Kara */ 2486c851ed54SJan Kara void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) 2487c851ed54SJan Kara { 2488c851ed54SJan Kara jinode->i_transaction = NULL; 2489c851ed54SJan Kara jinode->i_next_transaction = NULL; 2490c851ed54SJan Kara jinode->i_vfs_inode = inode; 2491c851ed54SJan Kara jinode->i_flags = 0; 2492c851ed54SJan Kara INIT_LIST_HEAD(&jinode->i_list); 2493c851ed54SJan Kara } 2494c851ed54SJan Kara 2495c851ed54SJan Kara /* 2496c851ed54SJan Kara * Function to be called before we start removing inode from memory (i.e., 2497c851ed54SJan Kara * clear_inode() is a fine place to be called from). It removes inode from 2498c851ed54SJan Kara * transaction's lists. 2499c851ed54SJan Kara */ 2500c851ed54SJan Kara void jbd2_journal_release_jbd_inode(journal_t *journal, 2501c851ed54SJan Kara struct jbd2_inode *jinode) 2502c851ed54SJan Kara { 2503c851ed54SJan Kara if (!journal) 2504c851ed54SJan Kara return; 2505c851ed54SJan Kara restart: 2506c851ed54SJan Kara spin_lock(&journal->j_list_lock); 2507c851ed54SJan Kara /* Is commit writing out inode - we have to wait */ 250839e3ac25SBrian King if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) { 2509c851ed54SJan Kara wait_queue_head_t *wq; 2510c851ed54SJan Kara DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); 2511c851ed54SJan Kara wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); 2512c851ed54SJan Kara prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); 2513c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2514c851ed54SJan Kara schedule(); 2515c851ed54SJan Kara finish_wait(wq, &wait.wait); 2516c851ed54SJan Kara goto restart; 2517c851ed54SJan Kara } 2518c851ed54SJan Kara 2519c851ed54SJan Kara if (jinode->i_transaction) { 2520c851ed54SJan Kara list_del(&jinode->i_list); 2521c851ed54SJan Kara jinode->i_transaction = NULL; 2522c851ed54SJan Kara } 2523c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2524c851ed54SJan Kara } 2525c851ed54SJan Kara 2526470decc6SDave Kleikamp 25278e85fb3fSJohann Lombardi #ifdef CONFIG_PROC_FS 25288e85fb3fSJohann Lombardi 25298e85fb3fSJohann Lombardi #define JBD2_STATS_PROC_NAME "fs/jbd2" 25308e85fb3fSJohann Lombardi 25318e85fb3fSJohann Lombardi static void __init jbd2_create_jbd_stats_proc_entry(void) 25328e85fb3fSJohann Lombardi { 25338e85fb3fSJohann Lombardi proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); 25348e85fb3fSJohann Lombardi } 25358e85fb3fSJohann Lombardi 25368e85fb3fSJohann Lombardi static void __exit jbd2_remove_jbd_stats_proc_entry(void) 25378e85fb3fSJohann Lombardi { 25388e85fb3fSJohann Lombardi if (proc_jbd2_stats) 25398e85fb3fSJohann Lombardi remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); 25408e85fb3fSJohann Lombardi } 25418e85fb3fSJohann Lombardi 25428e85fb3fSJohann Lombardi #else 25438e85fb3fSJohann Lombardi 25448e85fb3fSJohann Lombardi #define jbd2_create_jbd_stats_proc_entry() do {} while (0) 25458e85fb3fSJohann Lombardi #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) 25468e85fb3fSJohann Lombardi 25478e85fb3fSJohann Lombardi #endif 25488e85fb3fSJohann Lombardi 25498aefcd55STheodore Ts'o struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; 2550470decc6SDave Kleikamp 25514185a2acSYongqiang Yang static int __init jbd2_journal_init_handle_cache(void) 2552470decc6SDave Kleikamp { 25538aefcd55STheodore Ts'o jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); 2554f7f4bccbSMingming Cao if (jbd2_handle_cache == NULL) { 25558aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create handle cache\n"); 25568aefcd55STheodore Ts'o return -ENOMEM; 25578aefcd55STheodore Ts'o } 25588aefcd55STheodore Ts'o jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); 25598aefcd55STheodore Ts'o if (jbd2_inode_cache == NULL) { 25608aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create inode cache\n"); 25618aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_handle_cache); 2562470decc6SDave Kleikamp return -ENOMEM; 2563470decc6SDave Kleikamp } 2564470decc6SDave Kleikamp return 0; 2565470decc6SDave Kleikamp } 2566470decc6SDave Kleikamp 2567f7f4bccbSMingming Cao static void jbd2_journal_destroy_handle_cache(void) 2568470decc6SDave Kleikamp { 2569f7f4bccbSMingming Cao if (jbd2_handle_cache) 2570f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_handle_cache); 25718aefcd55STheodore Ts'o if (jbd2_inode_cache) 25728aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_inode_cache); 25738aefcd55STheodore Ts'o 2574470decc6SDave Kleikamp } 2575470decc6SDave Kleikamp 2576470decc6SDave Kleikamp /* 2577470decc6SDave Kleikamp * Module startup and shutdown 2578470decc6SDave Kleikamp */ 2579470decc6SDave Kleikamp 2580470decc6SDave Kleikamp static int __init journal_init_caches(void) 2581470decc6SDave Kleikamp { 2582470decc6SDave Kleikamp int ret; 2583470decc6SDave Kleikamp 2584f7f4bccbSMingming Cao ret = jbd2_journal_init_revoke_caches(); 2585470decc6SDave Kleikamp if (ret == 0) 25864185a2acSYongqiang Yang ret = jbd2_journal_init_journal_head_cache(); 2587470decc6SDave Kleikamp if (ret == 0) 25884185a2acSYongqiang Yang ret = jbd2_journal_init_handle_cache(); 25890c2022ecSYongqiang Yang if (ret == 0) 25900c2022ecSYongqiang Yang ret = jbd2_journal_init_transaction_cache(); 2591470decc6SDave Kleikamp return ret; 2592470decc6SDave Kleikamp } 2593470decc6SDave Kleikamp 2594f7f4bccbSMingming Cao static void jbd2_journal_destroy_caches(void) 2595470decc6SDave Kleikamp { 2596f7f4bccbSMingming Cao jbd2_journal_destroy_revoke_caches(); 25974185a2acSYongqiang Yang jbd2_journal_destroy_journal_head_cache(); 2598f7f4bccbSMingming Cao jbd2_journal_destroy_handle_cache(); 25990c2022ecSYongqiang Yang jbd2_journal_destroy_transaction_cache(); 2600d2eecb03STheodore Ts'o jbd2_journal_destroy_slabs(); 2601470decc6SDave Kleikamp } 2602470decc6SDave Kleikamp 2603470decc6SDave Kleikamp static int __init journal_init(void) 2604470decc6SDave Kleikamp { 2605470decc6SDave Kleikamp int ret; 2606470decc6SDave Kleikamp 2607470decc6SDave Kleikamp BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); 2608470decc6SDave Kleikamp 2609470decc6SDave Kleikamp ret = journal_init_caches(); 2610620de4e1SDuane Griffin if (ret == 0) { 26118e85fb3fSJohann Lombardi jbd2_create_jbd_stats_proc_entry(); 2612620de4e1SDuane Griffin } else { 2613620de4e1SDuane Griffin jbd2_journal_destroy_caches(); 2614620de4e1SDuane Griffin } 2615470decc6SDave Kleikamp return ret; 2616470decc6SDave Kleikamp } 2617470decc6SDave Kleikamp 2618470decc6SDave Kleikamp static void __exit journal_exit(void) 2619470decc6SDave Kleikamp { 2620e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2621470decc6SDave Kleikamp int n = atomic_read(&nr_journal_heads); 2622470decc6SDave Kleikamp if (n) 2623f2a44523SEryu Guan printk(KERN_EMERG "JBD2: leaked %d journal_heads!\n", n); 2624470decc6SDave Kleikamp #endif 26258e85fb3fSJohann Lombardi jbd2_remove_jbd_stats_proc_entry(); 2626f7f4bccbSMingming Cao jbd2_journal_destroy_caches(); 2627470decc6SDave Kleikamp } 2628470decc6SDave Kleikamp 2629470decc6SDave Kleikamp MODULE_LICENSE("GPL"); 2630470decc6SDave Kleikamp module_init(journal_init); 2631470decc6SDave Kleikamp module_exit(journal_exit); 2632470decc6SDave Kleikamp 2633