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; 454b34090e5SJan 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); 469b34090e5SJan 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 /* 481e4471831STheodore Ts'o * Called with j_state_lock locked for writing. 482e4471831STheodore Ts'o * Returns true if a transaction commit was started. 483470decc6SDave Kleikamp */ 484f7f4bccbSMingming Cao int __jbd2_log_start_commit(journal_t *journal, tid_t target) 485470decc6SDave Kleikamp { 486e7b04ac0SEric Sandeen /* Return if the txn has already requested to be committed */ 487e7b04ac0SEric Sandeen if (journal->j_commit_request == target) 488e7b04ac0SEric Sandeen return 0; 489e7b04ac0SEric Sandeen 490470decc6SDave Kleikamp /* 491deeeaf13STheodore Ts'o * The only transaction we can possibly wait upon is the 492deeeaf13STheodore Ts'o * currently running transaction (if it exists). Otherwise, 493deeeaf13STheodore Ts'o * the target tid must be an old one. 494470decc6SDave Kleikamp */ 495deeeaf13STheodore Ts'o if (journal->j_running_transaction && 496deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid == target) { 497470decc6SDave Kleikamp /* 498bcf3d0bcSAndrea Gelmini * We want a new commit: OK, mark the request and wakeup the 499470decc6SDave Kleikamp * commit thread. We do _not_ do the commit ourselves. 500470decc6SDave Kleikamp */ 501470decc6SDave Kleikamp 502470decc6SDave Kleikamp journal->j_commit_request = target; 503f2a44523SEryu Guan jbd_debug(1, "JBD2: requesting commit %d/%d\n", 504470decc6SDave Kleikamp journal->j_commit_request, 505470decc6SDave Kleikamp journal->j_commit_sequence); 5069fff24aaSTheodore Ts'o journal->j_running_transaction->t_requested = jiffies; 507470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 508470decc6SDave Kleikamp return 1; 509deeeaf13STheodore Ts'o } else if (!tid_geq(journal->j_commit_request, target)) 510deeeaf13STheodore Ts'o /* This should never happen, but if it does, preserve 511deeeaf13STheodore Ts'o the evidence before kjournald goes into a loop and 512deeeaf13STheodore Ts'o increments j_commit_sequence beyond all recognition. */ 513f2a44523SEryu Guan WARN_ONCE(1, "JBD2: bad log_start_commit: %u %u %u %u\n", 5141be2add6STheodore Ts'o journal->j_commit_request, 5151be2add6STheodore Ts'o journal->j_commit_sequence, 516deeeaf13STheodore Ts'o target, journal->j_running_transaction ? 517deeeaf13STheodore Ts'o journal->j_running_transaction->t_tid : 0); 518470decc6SDave Kleikamp return 0; 519470decc6SDave Kleikamp } 520470decc6SDave Kleikamp 521f7f4bccbSMingming Cao int jbd2_log_start_commit(journal_t *journal, tid_t tid) 522470decc6SDave Kleikamp { 523470decc6SDave Kleikamp int ret; 524470decc6SDave Kleikamp 525a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 526f7f4bccbSMingming Cao ret = __jbd2_log_start_commit(journal, tid); 527a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 528470decc6SDave Kleikamp return ret; 529470decc6SDave Kleikamp } 530470decc6SDave Kleikamp 531470decc6SDave Kleikamp /* 532*9ff86446SDmitry Monakhov * Force and wait any uncommitted transactions. We can only force the running 533*9ff86446SDmitry Monakhov * transaction if we don't have an active handle, otherwise, we will deadlock. 534*9ff86446SDmitry Monakhov * Returns: <0 in case of error, 535*9ff86446SDmitry Monakhov * 0 if nothing to commit, 536*9ff86446SDmitry Monakhov * 1 if transaction was successfully committed. 537470decc6SDave Kleikamp */ 538*9ff86446SDmitry Monakhov static int __jbd2_journal_force_commit(journal_t *journal) 539470decc6SDave Kleikamp { 540470decc6SDave Kleikamp transaction_t *transaction = NULL; 541470decc6SDave Kleikamp tid_t tid; 542*9ff86446SDmitry Monakhov int need_to_start = 0, ret = 0; 543470decc6SDave Kleikamp 544a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 545470decc6SDave Kleikamp if (journal->j_running_transaction && !current->journal_info) { 546470decc6SDave Kleikamp transaction = journal->j_running_transaction; 547e4471831STheodore Ts'o if (!tid_geq(journal->j_commit_request, transaction->t_tid)) 548e4471831STheodore Ts'o need_to_start = 1; 549470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 550470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 551470decc6SDave Kleikamp 552470decc6SDave Kleikamp if (!transaction) { 553*9ff86446SDmitry Monakhov /* Nothing to commit */ 554a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 555*9ff86446SDmitry Monakhov return 0; 556470decc6SDave Kleikamp } 557470decc6SDave Kleikamp tid = transaction->t_tid; 558a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 559e4471831STheodore Ts'o if (need_to_start) 560e4471831STheodore Ts'o jbd2_log_start_commit(journal, tid); 561*9ff86446SDmitry Monakhov ret = jbd2_log_wait_commit(journal, tid); 562*9ff86446SDmitry Monakhov if (!ret) 563*9ff86446SDmitry Monakhov ret = 1; 564*9ff86446SDmitry Monakhov 565*9ff86446SDmitry Monakhov return ret; 566*9ff86446SDmitry Monakhov } 567*9ff86446SDmitry Monakhov 568*9ff86446SDmitry Monakhov /** 569*9ff86446SDmitry Monakhov * Force and wait upon a commit if the calling process is not within 570*9ff86446SDmitry Monakhov * transaction. This is used for forcing out undo-protected data which contains 571*9ff86446SDmitry Monakhov * bitmaps, when the fs is running out of space. 572*9ff86446SDmitry Monakhov * 573*9ff86446SDmitry Monakhov * @journal: journal to force 574*9ff86446SDmitry Monakhov * Returns true if progress was made. 575*9ff86446SDmitry Monakhov */ 576*9ff86446SDmitry Monakhov int jbd2_journal_force_commit_nested(journal_t *journal) 577*9ff86446SDmitry Monakhov { 578*9ff86446SDmitry Monakhov int ret; 579*9ff86446SDmitry Monakhov 580*9ff86446SDmitry Monakhov ret = __jbd2_journal_force_commit(journal); 581*9ff86446SDmitry Monakhov return ret > 0; 582*9ff86446SDmitry Monakhov } 583*9ff86446SDmitry Monakhov 584*9ff86446SDmitry Monakhov /** 585*9ff86446SDmitry Monakhov * int journal_force_commit() - force any uncommitted transactions 586*9ff86446SDmitry Monakhov * @journal: journal to force 587*9ff86446SDmitry Monakhov * 588*9ff86446SDmitry Monakhov * Caller want unconditional commit. We can only force the running transaction 589*9ff86446SDmitry Monakhov * if we don't have an active handle, otherwise, we will deadlock. 590*9ff86446SDmitry Monakhov */ 591*9ff86446SDmitry Monakhov int jbd2_journal_force_commit(journal_t *journal) 592*9ff86446SDmitry Monakhov { 593*9ff86446SDmitry Monakhov int ret; 594*9ff86446SDmitry Monakhov 595*9ff86446SDmitry Monakhov J_ASSERT(!current->journal_info); 596*9ff86446SDmitry Monakhov ret = __jbd2_journal_force_commit(journal); 597*9ff86446SDmitry Monakhov if (ret > 0) 598*9ff86446SDmitry Monakhov ret = 0; 599*9ff86446SDmitry Monakhov return ret; 600470decc6SDave Kleikamp } 601470decc6SDave Kleikamp 602470decc6SDave Kleikamp /* 603470decc6SDave Kleikamp * Start a commit of the current running transaction (if any). Returns true 604c88ccea3SJan Kara * if a transaction is going to be committed (or is currently already 605c88ccea3SJan Kara * committing), and fills its tid in at *ptid 606470decc6SDave Kleikamp */ 607f7f4bccbSMingming Cao int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) 608470decc6SDave Kleikamp { 609470decc6SDave Kleikamp int ret = 0; 610470decc6SDave Kleikamp 611a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 612470decc6SDave Kleikamp if (journal->j_running_transaction) { 613470decc6SDave Kleikamp tid_t tid = journal->j_running_transaction->t_tid; 614470decc6SDave Kleikamp 615c88ccea3SJan Kara __jbd2_log_start_commit(journal, tid); 616c88ccea3SJan Kara /* There's a running transaction and we've just made sure 617c88ccea3SJan Kara * it's commit has been scheduled. */ 618c88ccea3SJan Kara if (ptid) 619470decc6SDave Kleikamp *ptid = tid; 620c88ccea3SJan Kara ret = 1; 621c88ccea3SJan Kara } else if (journal->j_committing_transaction) { 622470decc6SDave Kleikamp /* 62312810ad7SArtem Bityutskiy * If commit has been started, then we have to wait for 62412810ad7SArtem Bityutskiy * completion of that transaction. 625470decc6SDave Kleikamp */ 626c88ccea3SJan Kara if (ptid) 627470decc6SDave Kleikamp *ptid = journal->j_committing_transaction->t_tid; 628470decc6SDave Kleikamp ret = 1; 629470decc6SDave Kleikamp } 630a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 631470decc6SDave Kleikamp return ret; 632470decc6SDave Kleikamp } 633470decc6SDave Kleikamp 634470decc6SDave Kleikamp /* 635bbd2be36SJan Kara * Return 1 if a given transaction has not yet sent barrier request 636bbd2be36SJan Kara * connected with a transaction commit. If 0 is returned, transaction 637bbd2be36SJan Kara * may or may not have sent the barrier. Used to avoid sending barrier 638bbd2be36SJan Kara * twice in common cases. 639bbd2be36SJan Kara */ 640bbd2be36SJan Kara int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid) 641bbd2be36SJan Kara { 642bbd2be36SJan Kara int ret = 0; 643bbd2be36SJan Kara transaction_t *commit_trans; 644bbd2be36SJan Kara 645bbd2be36SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 646bbd2be36SJan Kara return 0; 647bbd2be36SJan Kara read_lock(&journal->j_state_lock); 648bbd2be36SJan Kara /* Transaction already committed? */ 649bbd2be36SJan Kara if (tid_geq(journal->j_commit_sequence, tid)) 650bbd2be36SJan Kara goto out; 651bbd2be36SJan Kara commit_trans = journal->j_committing_transaction; 652bbd2be36SJan Kara if (!commit_trans || commit_trans->t_tid != tid) { 653bbd2be36SJan Kara ret = 1; 654bbd2be36SJan Kara goto out; 655bbd2be36SJan Kara } 656bbd2be36SJan Kara /* 657bbd2be36SJan Kara * Transaction is being committed and we already proceeded to 658bbd2be36SJan Kara * submitting a flush to fs partition? 659bbd2be36SJan Kara */ 660bbd2be36SJan Kara if (journal->j_fs_dev != journal->j_dev) { 661bbd2be36SJan Kara if (!commit_trans->t_need_data_flush || 662bbd2be36SJan Kara commit_trans->t_state >= T_COMMIT_DFLUSH) 663bbd2be36SJan Kara goto out; 664bbd2be36SJan Kara } else { 665bbd2be36SJan Kara if (commit_trans->t_state >= T_COMMIT_JFLUSH) 666bbd2be36SJan Kara goto out; 667bbd2be36SJan Kara } 668bbd2be36SJan Kara ret = 1; 669bbd2be36SJan Kara out: 670bbd2be36SJan Kara read_unlock(&journal->j_state_lock); 671bbd2be36SJan Kara return ret; 672bbd2be36SJan Kara } 673bbd2be36SJan Kara EXPORT_SYMBOL(jbd2_trans_will_send_data_barrier); 674bbd2be36SJan Kara 675bbd2be36SJan Kara /* 676470decc6SDave Kleikamp * Wait for a specified commit to complete. 677470decc6SDave Kleikamp * The caller may not hold the journal lock. 678470decc6SDave Kleikamp */ 679f7f4bccbSMingming Cao int jbd2_log_wait_commit(journal_t *journal, tid_t tid) 680470decc6SDave Kleikamp { 681470decc6SDave Kleikamp int err = 0; 682470decc6SDave Kleikamp 683a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 684e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 685470decc6SDave Kleikamp if (!tid_geq(journal->j_commit_request, tid)) { 686470decc6SDave Kleikamp printk(KERN_EMERG 687470decc6SDave Kleikamp "%s: error: j_commit_request=%d, tid=%d\n", 688329d291fSHarvey Harrison __func__, journal->j_commit_request, tid); 689470decc6SDave Kleikamp } 690470decc6SDave Kleikamp #endif 691470decc6SDave Kleikamp while (tid_gt(tid, journal->j_commit_sequence)) { 692f2a44523SEryu Guan jbd_debug(1, "JBD2: want %d, j_commit_sequence=%d\n", 693470decc6SDave Kleikamp tid, journal->j_commit_sequence); 694470decc6SDave Kleikamp wake_up(&journal->j_wait_commit); 695a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 696470decc6SDave Kleikamp wait_event(journal->j_wait_done_commit, 697470decc6SDave Kleikamp !tid_gt(tid, journal->j_commit_sequence)); 698a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 699470decc6SDave Kleikamp } 700a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 701470decc6SDave Kleikamp 702470decc6SDave Kleikamp if (unlikely(is_journal_aborted(journal))) { 703470decc6SDave Kleikamp printk(KERN_EMERG "journal commit I/O error\n"); 704470decc6SDave Kleikamp err = -EIO; 705470decc6SDave Kleikamp } 706470decc6SDave Kleikamp return err; 707470decc6SDave Kleikamp } 708470decc6SDave Kleikamp 709470decc6SDave Kleikamp /* 710d76a3a77STheodore Ts'o * When this function returns the transaction corresponding to tid 711d76a3a77STheodore Ts'o * will be completed. If the transaction has currently running, start 712d76a3a77STheodore Ts'o * committing that transaction before waiting for it to complete. If 713d76a3a77STheodore Ts'o * the transaction id is stale, it is by definition already completed, 714d76a3a77STheodore Ts'o * so just return SUCCESS. 715d76a3a77STheodore Ts'o */ 716d76a3a77STheodore Ts'o int jbd2_complete_transaction(journal_t *journal, tid_t tid) 717d76a3a77STheodore Ts'o { 718d76a3a77STheodore Ts'o int need_to_wait = 1; 719d76a3a77STheodore Ts'o 720d76a3a77STheodore Ts'o read_lock(&journal->j_state_lock); 721d76a3a77STheodore Ts'o if (journal->j_running_transaction && 722d76a3a77STheodore Ts'o journal->j_running_transaction->t_tid == tid) { 723d76a3a77STheodore Ts'o if (journal->j_commit_request != tid) { 724d76a3a77STheodore Ts'o /* transaction not yet started, so request it */ 725d76a3a77STheodore Ts'o read_unlock(&journal->j_state_lock); 726d76a3a77STheodore Ts'o jbd2_log_start_commit(journal, tid); 727d76a3a77STheodore Ts'o goto wait_commit; 728d76a3a77STheodore Ts'o } 729d76a3a77STheodore Ts'o } else if (!(journal->j_committing_transaction && 730d76a3a77STheodore Ts'o journal->j_committing_transaction->t_tid == tid)) 731d76a3a77STheodore Ts'o need_to_wait = 0; 732d76a3a77STheodore Ts'o read_unlock(&journal->j_state_lock); 733d76a3a77STheodore Ts'o if (!need_to_wait) 734d76a3a77STheodore Ts'o return 0; 735d76a3a77STheodore Ts'o wait_commit: 736d76a3a77STheodore Ts'o return jbd2_log_wait_commit(journal, tid); 737d76a3a77STheodore Ts'o } 738d76a3a77STheodore Ts'o EXPORT_SYMBOL(jbd2_complete_transaction); 739d76a3a77STheodore Ts'o 740d76a3a77STheodore Ts'o /* 741470decc6SDave Kleikamp * Log buffer allocation routines: 742470decc6SDave Kleikamp */ 743470decc6SDave Kleikamp 74418eba7aaSMingming Cao int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) 745470decc6SDave Kleikamp { 746470decc6SDave Kleikamp unsigned long blocknr; 747470decc6SDave Kleikamp 748a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 749470decc6SDave Kleikamp J_ASSERT(journal->j_free > 1); 750470decc6SDave Kleikamp 751470decc6SDave Kleikamp blocknr = journal->j_head; 752470decc6SDave Kleikamp journal->j_head++; 753470decc6SDave Kleikamp journal->j_free--; 754470decc6SDave Kleikamp if (journal->j_head == journal->j_last) 755470decc6SDave Kleikamp journal->j_head = journal->j_first; 756a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 757f7f4bccbSMingming Cao return jbd2_journal_bmap(journal, blocknr, retp); 758470decc6SDave Kleikamp } 759470decc6SDave Kleikamp 760470decc6SDave Kleikamp /* 761470decc6SDave Kleikamp * Conversion of logical to physical block numbers for the journal 762470decc6SDave Kleikamp * 763470decc6SDave Kleikamp * On external journals the journal blocks are identity-mapped, so 764470decc6SDave Kleikamp * this is a no-op. If needed, we can use j_blk_offset - everything is 765470decc6SDave Kleikamp * ready. 766470decc6SDave Kleikamp */ 767f7f4bccbSMingming Cao int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, 76818eba7aaSMingming Cao unsigned long long *retp) 769470decc6SDave Kleikamp { 770470decc6SDave Kleikamp int err = 0; 77118eba7aaSMingming Cao unsigned long long ret; 772470decc6SDave Kleikamp 773470decc6SDave Kleikamp if (journal->j_inode) { 774470decc6SDave Kleikamp ret = bmap(journal->j_inode, blocknr); 775470decc6SDave Kleikamp if (ret) 776470decc6SDave Kleikamp *retp = ret; 777470decc6SDave Kleikamp else { 778470decc6SDave Kleikamp printk(KERN_ALERT "%s: journal block not found " 779470decc6SDave Kleikamp "at offset %lu on %s\n", 78005496769STheodore Ts'o __func__, blocknr, journal->j_devname); 781470decc6SDave Kleikamp err = -EIO; 782470decc6SDave Kleikamp __journal_abort_soft(journal, err); 783470decc6SDave Kleikamp } 784470decc6SDave Kleikamp } else { 785470decc6SDave Kleikamp *retp = blocknr; /* +journal->j_blk_offset */ 786470decc6SDave Kleikamp } 787470decc6SDave Kleikamp return err; 788470decc6SDave Kleikamp } 789470decc6SDave Kleikamp 790470decc6SDave Kleikamp /* 791470decc6SDave Kleikamp * We play buffer_head aliasing tricks to write data/metadata blocks to 792470decc6SDave Kleikamp * the journal without copying their contents, but for journal 793470decc6SDave Kleikamp * descriptor blocks we do need to generate bona fide buffers. 794470decc6SDave Kleikamp * 795f7f4bccbSMingming Cao * After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying 796470decc6SDave Kleikamp * the buffer's contents they really should run flush_dcache_page(bh->b_page). 797470decc6SDave Kleikamp * But we don't bother doing that, so there will be coherency problems with 798470decc6SDave Kleikamp * mmaps of blockdevs which hold live JBD-controlled filesystems. 799470decc6SDave Kleikamp */ 800e5a120aeSJan Kara struct buffer_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) 801470decc6SDave Kleikamp { 802470decc6SDave Kleikamp struct buffer_head *bh; 80318eba7aaSMingming Cao unsigned long long blocknr; 804470decc6SDave Kleikamp int err; 805470decc6SDave Kleikamp 806f7f4bccbSMingming Cao err = jbd2_journal_next_log_block(journal, &blocknr); 807470decc6SDave Kleikamp 808470decc6SDave Kleikamp if (err) 809470decc6SDave Kleikamp return NULL; 810470decc6SDave Kleikamp 811470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 8124b905671SJan Kara if (!bh) 8134b905671SJan Kara return NULL; 814470decc6SDave Kleikamp lock_buffer(bh); 815470decc6SDave Kleikamp memset(bh->b_data, 0, journal->j_blocksize); 816470decc6SDave Kleikamp set_buffer_uptodate(bh); 817470decc6SDave Kleikamp unlock_buffer(bh); 818470decc6SDave Kleikamp BUFFER_TRACE(bh, "return this buffer"); 819e5a120aeSJan Kara return bh; 820470decc6SDave Kleikamp } 821470decc6SDave Kleikamp 82279feb521SJan Kara /* 82379feb521SJan Kara * Return tid of the oldest transaction in the journal and block in the journal 82479feb521SJan Kara * where the transaction starts. 82579feb521SJan Kara * 82679feb521SJan Kara * If the journal is now empty, return which will be the next transaction ID 82779feb521SJan Kara * we will write and where will that transaction start. 82879feb521SJan Kara * 82979feb521SJan Kara * The return value is 0 if journal tail cannot be pushed any further, 1 if 83079feb521SJan Kara * it can. 83179feb521SJan Kara */ 83279feb521SJan Kara int jbd2_journal_get_log_tail(journal_t *journal, tid_t *tid, 83379feb521SJan Kara unsigned long *block) 83479feb521SJan Kara { 83579feb521SJan Kara transaction_t *transaction; 83679feb521SJan Kara int ret; 83779feb521SJan Kara 83879feb521SJan Kara read_lock(&journal->j_state_lock); 83979feb521SJan Kara spin_lock(&journal->j_list_lock); 84079feb521SJan Kara transaction = journal->j_checkpoint_transactions; 84179feb521SJan Kara if (transaction) { 84279feb521SJan Kara *tid = transaction->t_tid; 84379feb521SJan Kara *block = transaction->t_log_start; 84479feb521SJan Kara } else if ((transaction = journal->j_committing_transaction) != NULL) { 84579feb521SJan Kara *tid = transaction->t_tid; 84679feb521SJan Kara *block = transaction->t_log_start; 84779feb521SJan Kara } else if ((transaction = journal->j_running_transaction) != NULL) { 84879feb521SJan Kara *tid = transaction->t_tid; 84979feb521SJan Kara *block = journal->j_head; 85079feb521SJan Kara } else { 85179feb521SJan Kara *tid = journal->j_transaction_sequence; 85279feb521SJan Kara *block = journal->j_head; 85379feb521SJan Kara } 85479feb521SJan Kara ret = tid_gt(*tid, journal->j_tail_sequence); 85579feb521SJan Kara spin_unlock(&journal->j_list_lock); 85679feb521SJan Kara read_unlock(&journal->j_state_lock); 85779feb521SJan Kara 85879feb521SJan Kara return ret; 85979feb521SJan Kara } 86079feb521SJan Kara 86179feb521SJan Kara /* 86279feb521SJan Kara * Update information in journal structure and in on disk journal superblock 86379feb521SJan Kara * about log tail. This function does not check whether information passed in 86479feb521SJan Kara * really pushes log tail further. It's responsibility of the caller to make 86579feb521SJan Kara * sure provided log tail information is valid (e.g. by holding 86679feb521SJan Kara * j_checkpoint_mutex all the time between computing log tail and calling this 86779feb521SJan Kara * function as is the case with jbd2_cleanup_journal_tail()). 86879feb521SJan Kara * 86979feb521SJan Kara * Requires j_checkpoint_mutex 87079feb521SJan Kara */ 87179feb521SJan Kara void __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 87279feb521SJan Kara { 87379feb521SJan Kara unsigned long freed; 87479feb521SJan Kara 87579feb521SJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 87679feb521SJan Kara 87779feb521SJan Kara /* 87879feb521SJan Kara * We cannot afford for write to remain in drive's caches since as 87979feb521SJan Kara * soon as we update j_tail, next transaction can start reusing journal 88079feb521SJan Kara * space and if we lose sb update during power failure we'd replay 88179feb521SJan Kara * old transaction with possibly newly overwritten data. 88279feb521SJan Kara */ 88379feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, tid, block, WRITE_FUA); 88479feb521SJan Kara write_lock(&journal->j_state_lock); 88579feb521SJan Kara freed = block - journal->j_tail; 88679feb521SJan Kara if (block < journal->j_tail) 88779feb521SJan Kara freed += journal->j_last - journal->j_first; 88879feb521SJan Kara 88979feb521SJan Kara trace_jbd2_update_log_tail(journal, tid, block, freed); 89079feb521SJan Kara jbd_debug(1, 89179feb521SJan Kara "Cleaning journal tail from %d to %d (offset %lu), " 89279feb521SJan Kara "freeing %lu\n", 89379feb521SJan Kara journal->j_tail_sequence, tid, block, freed); 89479feb521SJan Kara 89579feb521SJan Kara journal->j_free += freed; 89679feb521SJan Kara journal->j_tail_sequence = tid; 89779feb521SJan Kara journal->j_tail = block; 89879feb521SJan Kara write_unlock(&journal->j_state_lock); 89979feb521SJan Kara } 90079feb521SJan Kara 9013339578fSJan Kara /* 9023339578fSJan Kara * This is a variaon of __jbd2_update_log_tail which checks for validity of 9033339578fSJan Kara * provided log tail and locks j_checkpoint_mutex. So it is safe against races 9043339578fSJan Kara * with other threads updating log tail. 9053339578fSJan Kara */ 9063339578fSJan Kara void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block) 9073339578fSJan Kara { 9083339578fSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 9093339578fSJan Kara if (tid_gt(tid, journal->j_tail_sequence)) 9103339578fSJan Kara __jbd2_update_log_tail(journal, tid, block); 9113339578fSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 9123339578fSJan Kara } 9133339578fSJan Kara 9148e85fb3fSJohann Lombardi struct jbd2_stats_proc_session { 9158e85fb3fSJohann Lombardi journal_t *journal; 9168e85fb3fSJohann Lombardi struct transaction_stats_s *stats; 9178e85fb3fSJohann Lombardi int start; 9188e85fb3fSJohann Lombardi int max; 9198e85fb3fSJohann Lombardi }; 9208e85fb3fSJohann Lombardi 9218e85fb3fSJohann Lombardi static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) 9228e85fb3fSJohann Lombardi { 9238e85fb3fSJohann Lombardi return *pos ? NULL : SEQ_START_TOKEN; 9248e85fb3fSJohann Lombardi } 9258e85fb3fSJohann Lombardi 9268e85fb3fSJohann Lombardi static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) 9278e85fb3fSJohann Lombardi { 9288e85fb3fSJohann Lombardi return NULL; 9298e85fb3fSJohann Lombardi } 9308e85fb3fSJohann Lombardi 9318e85fb3fSJohann Lombardi static int jbd2_seq_info_show(struct seq_file *seq, void *v) 9328e85fb3fSJohann Lombardi { 9338e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 9348e85fb3fSJohann Lombardi 9358e85fb3fSJohann Lombardi if (v != SEQ_START_TOKEN) 9368e85fb3fSJohann Lombardi return 0; 9379fff24aaSTheodore Ts'o seq_printf(seq, "%lu transactions (%lu requested), " 9389fff24aaSTheodore Ts'o "each up to %u blocks\n", 9399fff24aaSTheodore Ts'o s->stats->ts_tid, s->stats->ts_requested, 9408e85fb3fSJohann Lombardi s->journal->j_max_transaction_buffers); 9418e85fb3fSJohann Lombardi if (s->stats->ts_tid == 0) 9428e85fb3fSJohann Lombardi return 0; 9438e85fb3fSJohann Lombardi seq_printf(seq, "average: \n %ums waiting for transaction\n", 944bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); 9459fff24aaSTheodore Ts'o seq_printf(seq, " %ums request delay\n", 9469fff24aaSTheodore Ts'o (s->stats->ts_requested == 0) ? 0 : 9479fff24aaSTheodore Ts'o jiffies_to_msecs(s->stats->run.rs_request_delay / 9489fff24aaSTheodore Ts'o s->stats->ts_requested)); 9498e85fb3fSJohann Lombardi seq_printf(seq, " %ums running transaction\n", 950bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); 9518e85fb3fSJohann Lombardi seq_printf(seq, " %ums transaction was being locked\n", 952bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); 9538e85fb3fSJohann Lombardi seq_printf(seq, " %ums flushing data (in ordered mode)\n", 954bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); 9558e85fb3fSJohann Lombardi seq_printf(seq, " %ums logging transaction\n", 956bf699327STheodore Ts'o jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); 957c225aa57SSimon Holm Thøgersen seq_printf(seq, " %lluus average transaction commit time\n", 958c225aa57SSimon Holm Thøgersen div_u64(s->journal->j_average_commit_time, 1000)); 9598e85fb3fSJohann Lombardi seq_printf(seq, " %lu handles per transaction\n", 960bf699327STheodore Ts'o s->stats->run.rs_handle_count / s->stats->ts_tid); 9618e85fb3fSJohann Lombardi seq_printf(seq, " %lu blocks per transaction\n", 962bf699327STheodore Ts'o s->stats->run.rs_blocks / s->stats->ts_tid); 9638e85fb3fSJohann Lombardi seq_printf(seq, " %lu logged blocks per transaction\n", 964bf699327STheodore Ts'o s->stats->run.rs_blocks_logged / s->stats->ts_tid); 9658e85fb3fSJohann Lombardi return 0; 9668e85fb3fSJohann Lombardi } 9678e85fb3fSJohann Lombardi 9688e85fb3fSJohann Lombardi static void jbd2_seq_info_stop(struct seq_file *seq, void *v) 9698e85fb3fSJohann Lombardi { 9708e85fb3fSJohann Lombardi } 9718e85fb3fSJohann Lombardi 97288e9d34cSJames Morris static const struct seq_operations jbd2_seq_info_ops = { 9738e85fb3fSJohann Lombardi .start = jbd2_seq_info_start, 9748e85fb3fSJohann Lombardi .next = jbd2_seq_info_next, 9758e85fb3fSJohann Lombardi .stop = jbd2_seq_info_stop, 9768e85fb3fSJohann Lombardi .show = jbd2_seq_info_show, 9778e85fb3fSJohann Lombardi }; 9788e85fb3fSJohann Lombardi 9798e85fb3fSJohann Lombardi static int jbd2_seq_info_open(struct inode *inode, struct file *file) 9808e85fb3fSJohann Lombardi { 981d9dda78bSAl Viro journal_t *journal = PDE_DATA(inode); 9828e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s; 9838e85fb3fSJohann Lombardi int rc, size; 9848e85fb3fSJohann Lombardi 9858e85fb3fSJohann Lombardi s = kmalloc(sizeof(*s), GFP_KERNEL); 9868e85fb3fSJohann Lombardi if (s == NULL) 9878e85fb3fSJohann Lombardi return -ENOMEM; 9888e85fb3fSJohann Lombardi size = sizeof(struct transaction_stats_s); 9898e85fb3fSJohann Lombardi s->stats = kmalloc(size, GFP_KERNEL); 9908e85fb3fSJohann Lombardi if (s->stats == NULL) { 9918e85fb3fSJohann Lombardi kfree(s); 9928e85fb3fSJohann Lombardi return -ENOMEM; 9938e85fb3fSJohann Lombardi } 9948e85fb3fSJohann Lombardi spin_lock(&journal->j_history_lock); 9958e85fb3fSJohann Lombardi memcpy(s->stats, &journal->j_stats, size); 9968e85fb3fSJohann Lombardi s->journal = journal; 9978e85fb3fSJohann Lombardi spin_unlock(&journal->j_history_lock); 9988e85fb3fSJohann Lombardi 9998e85fb3fSJohann Lombardi rc = seq_open(file, &jbd2_seq_info_ops); 10008e85fb3fSJohann Lombardi if (rc == 0) { 10018e85fb3fSJohann Lombardi struct seq_file *m = file->private_data; 10028e85fb3fSJohann Lombardi m->private = s; 10038e85fb3fSJohann Lombardi } else { 10048e85fb3fSJohann Lombardi kfree(s->stats); 10058e85fb3fSJohann Lombardi kfree(s); 10068e85fb3fSJohann Lombardi } 10078e85fb3fSJohann Lombardi return rc; 10088e85fb3fSJohann Lombardi 10098e85fb3fSJohann Lombardi } 10108e85fb3fSJohann Lombardi 10118e85fb3fSJohann Lombardi static int jbd2_seq_info_release(struct inode *inode, struct file *file) 10128e85fb3fSJohann Lombardi { 10138e85fb3fSJohann Lombardi struct seq_file *seq = file->private_data; 10148e85fb3fSJohann Lombardi struct jbd2_stats_proc_session *s = seq->private; 10158e85fb3fSJohann Lombardi kfree(s->stats); 10168e85fb3fSJohann Lombardi kfree(s); 10178e85fb3fSJohann Lombardi return seq_release(inode, file); 10188e85fb3fSJohann Lombardi } 10198e85fb3fSJohann Lombardi 1020828c0950SAlexey Dobriyan static const struct file_operations jbd2_seq_info_fops = { 10218e85fb3fSJohann Lombardi .owner = THIS_MODULE, 10228e85fb3fSJohann Lombardi .open = jbd2_seq_info_open, 10238e85fb3fSJohann Lombardi .read = seq_read, 10248e85fb3fSJohann Lombardi .llseek = seq_lseek, 10258e85fb3fSJohann Lombardi .release = jbd2_seq_info_release, 10268e85fb3fSJohann Lombardi }; 10278e85fb3fSJohann Lombardi 10288e85fb3fSJohann Lombardi static struct proc_dir_entry *proc_jbd2_stats; 10298e85fb3fSJohann Lombardi 10308e85fb3fSJohann Lombardi static void jbd2_stats_proc_init(journal_t *journal) 10318e85fb3fSJohann Lombardi { 103205496769STheodore Ts'o journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); 10338e85fb3fSJohann Lombardi if (journal->j_proc_entry) { 103479da3664SDenis V. Lunev proc_create_data("info", S_IRUGO, journal->j_proc_entry, 103579da3664SDenis V. Lunev &jbd2_seq_info_fops, journal); 10368e85fb3fSJohann Lombardi } 10378e85fb3fSJohann Lombardi } 10388e85fb3fSJohann Lombardi 10398e85fb3fSJohann Lombardi static void jbd2_stats_proc_exit(journal_t *journal) 10408e85fb3fSJohann Lombardi { 10418e85fb3fSJohann Lombardi remove_proc_entry("info", journal->j_proc_entry); 104205496769STheodore Ts'o remove_proc_entry(journal->j_devname, proc_jbd2_stats); 10438e85fb3fSJohann Lombardi } 10448e85fb3fSJohann Lombardi 1045470decc6SDave Kleikamp /* 1046470decc6SDave Kleikamp * Management for journal control blocks: functions to create and 1047470decc6SDave Kleikamp * destroy journal_t structures, and to initialise and read existing 1048470decc6SDave Kleikamp * journal blocks from disk. */ 1049470decc6SDave Kleikamp 1050470decc6SDave Kleikamp /* First: create and setup a journal_t object in memory. We initialise 1051470decc6SDave Kleikamp * very few fields yet: that has to wait until we have created the 1052470decc6SDave Kleikamp * journal structures from from scratch, or loaded them from disk. */ 1053470decc6SDave Kleikamp 1054470decc6SDave Kleikamp static journal_t * journal_init_common (void) 1055470decc6SDave Kleikamp { 1056470decc6SDave Kleikamp journal_t *journal; 1057470decc6SDave Kleikamp int err; 1058470decc6SDave Kleikamp 10593ebfdf88SAndrew Morton journal = kzalloc(sizeof(*journal), GFP_KERNEL); 1060470decc6SDave Kleikamp if (!journal) 1061b7271b0aSTheodore Ts'o return NULL; 1062470decc6SDave Kleikamp 1063470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_transaction_locked); 1064470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_done_commit); 1065470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_commit); 1066470decc6SDave Kleikamp init_waitqueue_head(&journal->j_wait_updates); 10678f7d89f3SJan Kara init_waitqueue_head(&journal->j_wait_reserved); 1068470decc6SDave Kleikamp mutex_init(&journal->j_barrier); 1069470decc6SDave Kleikamp mutex_init(&journal->j_checkpoint_mutex); 1070470decc6SDave Kleikamp spin_lock_init(&journal->j_revoke_lock); 1071470decc6SDave Kleikamp spin_lock_init(&journal->j_list_lock); 1072a931da6aSTheodore Ts'o rwlock_init(&journal->j_state_lock); 1073470decc6SDave Kleikamp 1074cd02ff0bSMingming Cao journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); 107530773840STheodore Ts'o journal->j_min_batch_time = 0; 107630773840STheodore Ts'o journal->j_max_batch_time = 15000; /* 15ms */ 10778f7d89f3SJan Kara atomic_set(&journal->j_reserved_credits, 0); 1078470decc6SDave Kleikamp 1079470decc6SDave Kleikamp /* The journal is marked for error until we succeed with recovery! */ 1080f7f4bccbSMingming Cao journal->j_flags = JBD2_ABORT; 1081470decc6SDave Kleikamp 1082470decc6SDave Kleikamp /* Set up a default-sized revoke table for the new mount. */ 1083f7f4bccbSMingming Cao err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); 1084470decc6SDave Kleikamp if (err) { 1085470decc6SDave Kleikamp kfree(journal); 1086b7271b0aSTheodore Ts'o return NULL; 1087470decc6SDave Kleikamp } 10888e85fb3fSJohann Lombardi 1089bf699327STheodore Ts'o spin_lock_init(&journal->j_history_lock); 10908e85fb3fSJohann Lombardi 1091470decc6SDave Kleikamp return journal; 1092470decc6SDave Kleikamp } 1093470decc6SDave Kleikamp 1094f7f4bccbSMingming Cao /* jbd2_journal_init_dev and jbd2_journal_init_inode: 1095470decc6SDave Kleikamp * 1096470decc6SDave Kleikamp * Create a journal structure assigned some fixed set of disk blocks to 1097470decc6SDave Kleikamp * the journal. We don't actually touch those disk blocks yet, but we 1098470decc6SDave Kleikamp * need to set up all of the mapping information to tell the journaling 1099470decc6SDave Kleikamp * system where the journal blocks are. 1100470decc6SDave Kleikamp * 1101470decc6SDave Kleikamp */ 1102470decc6SDave Kleikamp 1103470decc6SDave Kleikamp /** 11045648ba5bSRandy Dunlap * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure 1105470decc6SDave Kleikamp * @bdev: Block device on which to create the journal 1106470decc6SDave Kleikamp * @fs_dev: Device which hold journalled filesystem for this journal. 1107470decc6SDave Kleikamp * @start: Block nr Start of journal. 1108470decc6SDave Kleikamp * @len: Length of the journal in blocks. 1109470decc6SDave Kleikamp * @blocksize: blocksize of journalling device 11105648ba5bSRandy Dunlap * 11115648ba5bSRandy Dunlap * Returns: a newly created journal_t * 1112470decc6SDave Kleikamp * 1113f7f4bccbSMingming Cao * jbd2_journal_init_dev creates a journal which maps a fixed contiguous 1114470decc6SDave Kleikamp * range of blocks on an arbitrary block device. 1115470decc6SDave Kleikamp * 1116470decc6SDave Kleikamp */ 1117f7f4bccbSMingming Cao journal_t * jbd2_journal_init_dev(struct block_device *bdev, 1118470decc6SDave Kleikamp struct block_device *fs_dev, 111918eba7aaSMingming Cao unsigned long long start, int len, int blocksize) 1120470decc6SDave Kleikamp { 1121470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 1122470decc6SDave Kleikamp struct buffer_head *bh; 112305496769STheodore Ts'o char *p; 1124470decc6SDave Kleikamp int n; 1125470decc6SDave Kleikamp 1126470decc6SDave Kleikamp if (!journal) 1127470decc6SDave Kleikamp return NULL; 1128470decc6SDave Kleikamp 1129470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1130470decc6SDave Kleikamp journal->j_blocksize = blocksize; 11310587aa3dSyangsheng journal->j_dev = bdev; 11320587aa3dSyangsheng journal->j_fs_dev = fs_dev; 11330587aa3dSyangsheng journal->j_blk_offset = start; 11340587aa3dSyangsheng journal->j_maxlen = len; 11350587aa3dSyangsheng bdevname(journal->j_dev, journal->j_devname); 11360587aa3dSyangsheng p = journal->j_devname; 11370587aa3dSyangsheng while ((p = strchr(p, '/'))) 11380587aa3dSyangsheng *p = '!'; 11394b905671SJan Kara jbd2_stats_proc_init(journal); 1140470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1141470decc6SDave Kleikamp journal->j_wbufsize = n; 1142470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1143470decc6SDave Kleikamp if (!journal->j_wbuf) { 114425985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1145329d291fSHarvey Harrison __func__); 11464b905671SJan Kara goto out_err; 1147470decc6SDave Kleikamp } 1148470decc6SDave Kleikamp 1149470decc6SDave Kleikamp bh = __getblk(journal->j_dev, start, journal->j_blocksize); 11504b905671SJan Kara if (!bh) { 11514b905671SJan Kara printk(KERN_ERR 11524b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 11534b905671SJan Kara __func__); 11544b905671SJan Kara goto out_err; 11554b905671SJan Kara } 1156470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1157470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 11584b905671SJan Kara 1159470decc6SDave Kleikamp return journal; 11604b905671SJan Kara out_err: 11617b02bec0STao Ma kfree(journal->j_wbuf); 11624b905671SJan Kara jbd2_stats_proc_exit(journal); 11634b905671SJan Kara kfree(journal); 11644b905671SJan Kara return NULL; 1165470decc6SDave Kleikamp } 1166470decc6SDave Kleikamp 1167470decc6SDave Kleikamp /** 1168f7f4bccbSMingming Cao * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. 1169470decc6SDave Kleikamp * @inode: An inode to create the journal in 1170470decc6SDave Kleikamp * 1171f7f4bccbSMingming Cao * jbd2_journal_init_inode creates a journal which maps an on-disk inode as 1172470decc6SDave Kleikamp * the journal. The inode must exist already, must support bmap() and 1173470decc6SDave Kleikamp * must have all data blocks preallocated. 1174470decc6SDave Kleikamp */ 1175f7f4bccbSMingming Cao journal_t * jbd2_journal_init_inode (struct inode *inode) 1176470decc6SDave Kleikamp { 1177470decc6SDave Kleikamp struct buffer_head *bh; 1178470decc6SDave Kleikamp journal_t *journal = journal_init_common(); 117905496769STheodore Ts'o char *p; 1180470decc6SDave Kleikamp int err; 1181470decc6SDave Kleikamp int n; 118218eba7aaSMingming Cao unsigned long long blocknr; 1183470decc6SDave Kleikamp 1184470decc6SDave Kleikamp if (!journal) 1185470decc6SDave Kleikamp return NULL; 1186470decc6SDave Kleikamp 1187470decc6SDave Kleikamp journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; 1188470decc6SDave Kleikamp journal->j_inode = inode; 118905496769STheodore Ts'o bdevname(journal->j_dev, journal->j_devname); 119005496769STheodore Ts'o p = journal->j_devname; 119105496769STheodore Ts'o while ((p = strchr(p, '/'))) 119205496769STheodore Ts'o *p = '!'; 119305496769STheodore Ts'o p = journal->j_devname + strlen(journal->j_devname); 119490576c0bSTheodore Ts'o sprintf(p, "-%lu", journal->j_inode->i_ino); 1195470decc6SDave Kleikamp jbd_debug(1, 1196470decc6SDave Kleikamp "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n", 1197470decc6SDave Kleikamp journal, inode->i_sb->s_id, inode->i_ino, 1198470decc6SDave Kleikamp (long long) inode->i_size, 1199470decc6SDave Kleikamp inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); 1200470decc6SDave Kleikamp 1201470decc6SDave Kleikamp journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; 1202470decc6SDave Kleikamp journal->j_blocksize = inode->i_sb->s_blocksize; 12038e85fb3fSJohann Lombardi jbd2_stats_proc_init(journal); 1204470decc6SDave Kleikamp 1205470decc6SDave Kleikamp /* journal descriptor can store up to n blocks -bzzz */ 1206470decc6SDave Kleikamp n = journal->j_blocksize / sizeof(journal_block_tag_t); 1207470decc6SDave Kleikamp journal->j_wbufsize = n; 1208470decc6SDave Kleikamp journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); 1209470decc6SDave Kleikamp if (!journal->j_wbuf) { 121025985edcSLucas De Marchi printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n", 1211329d291fSHarvey Harrison __func__); 12124b905671SJan Kara goto out_err; 1213470decc6SDave Kleikamp } 1214470decc6SDave Kleikamp 1215f7f4bccbSMingming Cao err = jbd2_journal_bmap(journal, 0, &blocknr); 1216470decc6SDave Kleikamp /* If that failed, give up */ 1217470decc6SDave Kleikamp if (err) { 12183c26bdb4SJustin P. Mattock printk(KERN_ERR "%s: Cannot locate journal superblock\n", 1219329d291fSHarvey Harrison __func__); 12204b905671SJan Kara goto out_err; 1221470decc6SDave Kleikamp } 1222470decc6SDave Kleikamp 1223470decc6SDave Kleikamp bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); 12244b905671SJan Kara if (!bh) { 12254b905671SJan Kara printk(KERN_ERR 12264b905671SJan Kara "%s: Cannot get buffer for journal superblock\n", 12274b905671SJan Kara __func__); 12284b905671SJan Kara goto out_err; 12294b905671SJan Kara } 1230470decc6SDave Kleikamp journal->j_sb_buffer = bh; 1231470decc6SDave Kleikamp journal->j_superblock = (journal_superblock_t *)bh->b_data; 1232470decc6SDave Kleikamp 1233470decc6SDave Kleikamp return journal; 12344b905671SJan Kara out_err: 12357b02bec0STao Ma kfree(journal->j_wbuf); 12364b905671SJan Kara jbd2_stats_proc_exit(journal); 12374b905671SJan Kara kfree(journal); 12384b905671SJan Kara return NULL; 1239470decc6SDave Kleikamp } 1240470decc6SDave Kleikamp 1241470decc6SDave Kleikamp /* 1242470decc6SDave Kleikamp * If the journal init or create aborts, we need to mark the journal 1243470decc6SDave Kleikamp * superblock as being NULL to prevent the journal destroy from writing 1244470decc6SDave Kleikamp * back a bogus superblock. 1245470decc6SDave Kleikamp */ 1246470decc6SDave Kleikamp static void journal_fail_superblock (journal_t *journal) 1247470decc6SDave Kleikamp { 1248470decc6SDave Kleikamp struct buffer_head *bh = journal->j_sb_buffer; 1249470decc6SDave Kleikamp brelse(bh); 1250470decc6SDave Kleikamp journal->j_sb_buffer = NULL; 1251470decc6SDave Kleikamp } 1252470decc6SDave Kleikamp 1253470decc6SDave Kleikamp /* 1254470decc6SDave Kleikamp * Given a journal_t structure, initialise the various fields for 1255470decc6SDave Kleikamp * startup of a new journaling session. We use this both when creating 1256470decc6SDave Kleikamp * a journal, and after recovering an old journal to reset it for 1257470decc6SDave Kleikamp * subsequent use. 1258470decc6SDave Kleikamp */ 1259470decc6SDave Kleikamp 1260470decc6SDave Kleikamp static int journal_reset(journal_t *journal) 1261470decc6SDave Kleikamp { 1262470decc6SDave Kleikamp journal_superblock_t *sb = journal->j_superblock; 126318eba7aaSMingming Cao unsigned long long first, last; 1264470decc6SDave Kleikamp 1265470decc6SDave Kleikamp first = be32_to_cpu(sb->s_first); 1266470decc6SDave Kleikamp last = be32_to_cpu(sb->s_maxlen); 1267f6f50e28SJan Kara if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { 1268f2a44523SEryu Guan printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu).\n", 1269f6f50e28SJan Kara first, last); 1270f6f50e28SJan Kara journal_fail_superblock(journal); 1271f6f50e28SJan Kara return -EINVAL; 1272f6f50e28SJan Kara } 1273470decc6SDave Kleikamp 1274470decc6SDave Kleikamp journal->j_first = first; 1275470decc6SDave Kleikamp journal->j_last = last; 1276470decc6SDave Kleikamp 1277470decc6SDave Kleikamp journal->j_head = first; 1278470decc6SDave Kleikamp journal->j_tail = first; 1279470decc6SDave Kleikamp journal->j_free = last - first; 1280470decc6SDave Kleikamp 1281470decc6SDave Kleikamp journal->j_tail_sequence = journal->j_transaction_sequence; 1282470decc6SDave Kleikamp journal->j_commit_sequence = journal->j_transaction_sequence - 1; 1283470decc6SDave Kleikamp journal->j_commit_request = journal->j_commit_sequence; 1284470decc6SDave Kleikamp 1285470decc6SDave Kleikamp journal->j_max_transaction_buffers = journal->j_maxlen / 4; 1286470decc6SDave Kleikamp 1287470decc6SDave Kleikamp /* 1288470decc6SDave Kleikamp * As a special case, if the on-disk copy is already marked as needing 128924bcc89cSJan Kara * no recovery (s_start == 0), then we can safely defer the superblock 129024bcc89cSJan Kara * update until the next commit by setting JBD2_FLUSHED. This avoids 1291470decc6SDave Kleikamp * attempting a write to a potential-readonly device. 1292470decc6SDave Kleikamp */ 129324bcc89cSJan Kara if (sb->s_start == 0) { 1294f2a44523SEryu Guan jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " 1295470decc6SDave Kleikamp "(start %ld, seq %d, errno %d)\n", 1296470decc6SDave Kleikamp journal->j_tail, journal->j_tail_sequence, 1297470decc6SDave Kleikamp journal->j_errno); 129824bcc89cSJan Kara journal->j_flags |= JBD2_FLUSHED; 129924bcc89cSJan Kara } else { 1300a78bb11dSJan Kara /* Lock here to make assertions happy... */ 1301a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 130279feb521SJan Kara /* 130379feb521SJan Kara * Update log tail information. We use WRITE_FUA since new 130479feb521SJan Kara * transaction will start reusing journal space and so we 130579feb521SJan Kara * must make sure information about current log tail is on 130679feb521SJan Kara * disk before that. 130779feb521SJan Kara */ 130879feb521SJan Kara jbd2_journal_update_sb_log_tail(journal, 130979feb521SJan Kara journal->j_tail_sequence, 131079feb521SJan Kara journal->j_tail, 131179feb521SJan Kara WRITE_FUA); 1312a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 131324bcc89cSJan Kara } 131424bcc89cSJan Kara return jbd2_journal_start_thread(journal); 1315470decc6SDave Kleikamp } 1316470decc6SDave Kleikamp 131779feb521SJan Kara static void jbd2_write_superblock(journal_t *journal, int write_op) 131824bcc89cSJan Kara { 131924bcc89cSJan Kara struct buffer_head *bh = journal->j_sb_buffer; 132079feb521SJan Kara int ret; 132124bcc89cSJan Kara 132279feb521SJan Kara trace_jbd2_write_superblock(journal, write_op); 132379feb521SJan Kara if (!(journal->j_flags & JBD2_BARRIER)) 132479feb521SJan Kara write_op &= ~(REQ_FUA | REQ_FLUSH); 132579feb521SJan Kara lock_buffer(bh); 1326914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1327914258bfSTheodore Ts'o /* 1328914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the journal 1329914258bfSTheodore Ts'o * superblock failed. This could happen because the 1330914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 1331914258bfSTheodore Ts'o * be a transient write error and maybe the block will 1332914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 1333914258bfSTheodore Ts'o * write and hope for the best. 1334914258bfSTheodore Ts'o */ 1335914258bfSTheodore Ts'o printk(KERN_ERR "JBD2: previous I/O error detected " 1336914258bfSTheodore Ts'o "for journal superblock update for %s.\n", 1337914258bfSTheodore Ts'o journal->j_devname); 1338914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1339914258bfSTheodore Ts'o set_buffer_uptodate(bh); 1340914258bfSTheodore Ts'o } 134179feb521SJan Kara get_bh(bh); 134279feb521SJan Kara bh->b_end_io = end_buffer_write_sync; 134379feb521SJan Kara ret = submit_bh(write_op, bh); 134479feb521SJan Kara wait_on_buffer(bh); 1345914258bfSTheodore Ts'o if (buffer_write_io_error(bh)) { 1346914258bfSTheodore Ts'o clear_buffer_write_io_error(bh); 1347914258bfSTheodore Ts'o set_buffer_uptodate(bh); 134879feb521SJan Kara ret = -EIO; 134979feb521SJan Kara } 135079feb521SJan Kara if (ret) { 135179feb521SJan Kara printk(KERN_ERR "JBD2: Error %d detected when updating " 135279feb521SJan Kara "journal superblock for %s.\n", ret, 135379feb521SJan Kara journal->j_devname); 1354914258bfSTheodore Ts'o } 135524bcc89cSJan Kara } 1356470decc6SDave Kleikamp 135724bcc89cSJan Kara /** 135824bcc89cSJan Kara * jbd2_journal_update_sb_log_tail() - Update log tail in journal sb on disk. 135924bcc89cSJan Kara * @journal: The journal to update. 136079feb521SJan Kara * @tail_tid: TID of the new transaction at the tail of the log 136179feb521SJan Kara * @tail_block: The first block of the transaction at the tail of the log 136279feb521SJan Kara * @write_op: With which operation should we write the journal sb 136324bcc89cSJan Kara * 136424bcc89cSJan Kara * Update a journal's superblock information about log tail and write it to 136524bcc89cSJan Kara * disk, waiting for the IO to complete. 136624bcc89cSJan Kara */ 136779feb521SJan Kara void jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid, 136879feb521SJan Kara unsigned long tail_block, int write_op) 136924bcc89cSJan Kara { 137024bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 13712201c590SSeiji Aguchi 1372a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 137379feb521SJan Kara jbd_debug(1, "JBD2: updating superblock (start %lu, seq %u)\n", 137479feb521SJan Kara tail_block, tail_tid); 1375470decc6SDave Kleikamp 137679feb521SJan Kara sb->s_sequence = cpu_to_be32(tail_tid); 137779feb521SJan Kara sb->s_start = cpu_to_be32(tail_block); 137824bcc89cSJan Kara 137979feb521SJan Kara jbd2_write_superblock(journal, write_op); 138024bcc89cSJan Kara 138124bcc89cSJan Kara /* Log is no longer empty */ 1382a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 138324bcc89cSJan Kara WARN_ON(!sb->s_sequence); 1384f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_FLUSHED; 138524bcc89cSJan Kara write_unlock(&journal->j_state_lock); 138624bcc89cSJan Kara } 138724bcc89cSJan Kara 138824bcc89cSJan Kara /** 138924bcc89cSJan Kara * jbd2_mark_journal_empty() - Mark on disk journal as empty. 139024bcc89cSJan Kara * @journal: The journal to update. 139124bcc89cSJan Kara * 139224bcc89cSJan Kara * Update a journal's dynamic superblock fields to show that journal is empty. 139324bcc89cSJan Kara * Write updated superblock to disk waiting for IO to complete. 139424bcc89cSJan Kara */ 139524bcc89cSJan Kara static void jbd2_mark_journal_empty(journal_t *journal) 139624bcc89cSJan Kara { 139724bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 139824bcc89cSJan Kara 1399a78bb11dSJan Kara BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); 1400470decc6SDave Kleikamp read_lock(&journal->j_state_lock); 1401eeecef0aSEric Sandeen /* Is it already empty? */ 1402eeecef0aSEric Sandeen if (sb->s_start == 0) { 1403eeecef0aSEric Sandeen read_unlock(&journal->j_state_lock); 1404eeecef0aSEric Sandeen return; 1405eeecef0aSEric Sandeen } 140624bcc89cSJan Kara jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n", 140724bcc89cSJan Kara journal->j_tail_sequence); 1408470decc6SDave Kleikamp 1409470decc6SDave Kleikamp sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); 141024bcc89cSJan Kara sb->s_start = cpu_to_be32(0); 141124bcc89cSJan Kara read_unlock(&journal->j_state_lock); 141224bcc89cSJan Kara 141379feb521SJan Kara jbd2_write_superblock(journal, WRITE_FUA); 141424bcc89cSJan Kara 141524bcc89cSJan Kara /* Log is no longer empty */ 141624bcc89cSJan Kara write_lock(&journal->j_state_lock); 1417f7f4bccbSMingming Cao journal->j_flags |= JBD2_FLUSHED; 1418a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1419470decc6SDave Kleikamp } 1420470decc6SDave Kleikamp 142124bcc89cSJan Kara 142224bcc89cSJan Kara /** 142324bcc89cSJan Kara * jbd2_journal_update_sb_errno() - Update error in the journal. 142424bcc89cSJan Kara * @journal: The journal to update. 142524bcc89cSJan Kara * 142624bcc89cSJan Kara * Update a journal's errno. Write updated superblock to disk waiting for IO 142724bcc89cSJan Kara * to complete. 142824bcc89cSJan Kara */ 1429d796c52eSTheodore Ts'o void jbd2_journal_update_sb_errno(journal_t *journal) 143024bcc89cSJan Kara { 143124bcc89cSJan Kara journal_superblock_t *sb = journal->j_superblock; 143224bcc89cSJan Kara 143324bcc89cSJan Kara read_lock(&journal->j_state_lock); 143424bcc89cSJan Kara jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", 143524bcc89cSJan Kara journal->j_errno); 1436470decc6SDave Kleikamp sb->s_errno = cpu_to_be32(journal->j_errno); 14374fd5ea43SDarrick J. Wong jbd2_superblock_csum_set(journal, sb); 1438470decc6SDave Kleikamp read_unlock(&journal->j_state_lock); 1439470decc6SDave Kleikamp 144079feb521SJan Kara jbd2_write_superblock(journal, WRITE_SYNC); 1441470decc6SDave Kleikamp } 1442d796c52eSTheodore Ts'o EXPORT_SYMBOL(jbd2_journal_update_sb_errno); 1443470decc6SDave Kleikamp 1444470decc6SDave Kleikamp /* 1445470decc6SDave Kleikamp * Read the superblock for a given journal, performing initial 1446470decc6SDave Kleikamp * validation of the format. 1447470decc6SDave Kleikamp */ 1448470decc6SDave Kleikamp static int journal_get_superblock(journal_t *journal) 1449470decc6SDave Kleikamp { 1450470decc6SDave Kleikamp struct buffer_head *bh; 1451470decc6SDave Kleikamp journal_superblock_t *sb; 1452470decc6SDave Kleikamp int err = -EIO; 1453470decc6SDave Kleikamp 1454470decc6SDave Kleikamp bh = journal->j_sb_buffer; 1455470decc6SDave Kleikamp 1456470decc6SDave Kleikamp J_ASSERT(bh != NULL); 1457470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1458470decc6SDave Kleikamp ll_rw_block(READ, 1, &bh); 1459470decc6SDave Kleikamp wait_on_buffer(bh); 1460470decc6SDave Kleikamp if (!buffer_uptodate(bh)) { 1461470decc6SDave Kleikamp printk(KERN_ERR 1462f2a44523SEryu Guan "JBD2: IO error reading journal superblock\n"); 1463470decc6SDave Kleikamp goto out; 1464470decc6SDave Kleikamp } 1465470decc6SDave Kleikamp } 1466470decc6SDave Kleikamp 146725ed6e8aSDarrick J. Wong if (buffer_verified(bh)) 146825ed6e8aSDarrick J. Wong return 0; 146925ed6e8aSDarrick J. Wong 1470470decc6SDave Kleikamp sb = journal->j_superblock; 1471470decc6SDave Kleikamp 1472470decc6SDave Kleikamp err = -EINVAL; 1473470decc6SDave Kleikamp 1474f7f4bccbSMingming Cao if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || 1475470decc6SDave Kleikamp sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { 1476f2a44523SEryu Guan printk(KERN_WARNING "JBD2: no valid journal superblock found\n"); 1477470decc6SDave Kleikamp goto out; 1478470decc6SDave Kleikamp } 1479470decc6SDave Kleikamp 1480470decc6SDave Kleikamp switch(be32_to_cpu(sb->s_header.h_blocktype)) { 1481f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V1: 1482470decc6SDave Kleikamp journal->j_format_version = 1; 1483470decc6SDave Kleikamp break; 1484f7f4bccbSMingming Cao case JBD2_SUPERBLOCK_V2: 1485470decc6SDave Kleikamp journal->j_format_version = 2; 1486470decc6SDave Kleikamp break; 1487470decc6SDave Kleikamp default: 1488f2a44523SEryu Guan printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n"); 1489470decc6SDave Kleikamp goto out; 1490470decc6SDave Kleikamp } 1491470decc6SDave Kleikamp 1492470decc6SDave Kleikamp if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) 1493470decc6SDave Kleikamp journal->j_maxlen = be32_to_cpu(sb->s_maxlen); 1494470decc6SDave Kleikamp else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { 1495f2a44523SEryu Guan printk(KERN_WARNING "JBD2: journal file too short\n"); 1496470decc6SDave Kleikamp goto out; 1497470decc6SDave Kleikamp } 1498470decc6SDave Kleikamp 14998762202dSEryu Guan if (be32_to_cpu(sb->s_first) == 0 || 15008762202dSEryu Guan be32_to_cpu(sb->s_first) >= journal->j_maxlen) { 15018762202dSEryu Guan printk(KERN_WARNING 15028762202dSEryu Guan "JBD2: Invalid start block of journal: %u\n", 15038762202dSEryu Guan be32_to_cpu(sb->s_first)); 15048762202dSEryu Guan goto out; 15058762202dSEryu Guan } 15068762202dSEryu Guan 150725ed6e8aSDarrick J. Wong if (JBD2_HAS_COMPAT_FEATURE(journal, JBD2_FEATURE_COMPAT_CHECKSUM) && 150825ed6e8aSDarrick J. Wong JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) { 150925ed6e8aSDarrick J. Wong /* Can't have checksum v1 and v2 on at the same time! */ 151025ed6e8aSDarrick J. Wong printk(KERN_ERR "JBD: Can't enable checksumming v1 and v2 " 151125ed6e8aSDarrick J. Wong "at the same time!\n"); 151225ed6e8aSDarrick J. Wong goto out; 151325ed6e8aSDarrick J. Wong } 151425ed6e8aSDarrick J. Wong 151525ed6e8aSDarrick J. Wong if (!jbd2_verify_csum_type(journal, sb)) { 151625ed6e8aSDarrick J. Wong printk(KERN_ERR "JBD: Unknown checksum type\n"); 151725ed6e8aSDarrick J. Wong goto out; 151825ed6e8aSDarrick J. Wong } 151925ed6e8aSDarrick J. Wong 152001b5adceSDarrick J. Wong /* Load the checksum driver */ 152101b5adceSDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) { 152201b5adceSDarrick J. Wong journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); 152301b5adceSDarrick J. Wong if (IS_ERR(journal->j_chksum_driver)) { 152401b5adceSDarrick J. Wong printk(KERN_ERR "JBD: Cannot load crc32c driver.\n"); 152501b5adceSDarrick J. Wong err = PTR_ERR(journal->j_chksum_driver); 152601b5adceSDarrick J. Wong journal->j_chksum_driver = NULL; 152701b5adceSDarrick J. Wong goto out; 152801b5adceSDarrick J. Wong } 152901b5adceSDarrick J. Wong } 153001b5adceSDarrick J. Wong 15314fd5ea43SDarrick J. Wong /* Check superblock checksum */ 15324fd5ea43SDarrick J. Wong if (!jbd2_superblock_csum_verify(journal, sb)) { 15334fd5ea43SDarrick J. Wong printk(KERN_ERR "JBD: journal checksum error\n"); 15344fd5ea43SDarrick J. Wong goto out; 15354fd5ea43SDarrick J. Wong } 15364fd5ea43SDarrick J. Wong 15374fd5ea43SDarrick J. Wong /* Precompute checksum seed for all metadata */ 15384fd5ea43SDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) 15394fd5ea43SDarrick J. Wong journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid, 15404fd5ea43SDarrick J. Wong sizeof(sb->s_uuid)); 15414fd5ea43SDarrick J. Wong 154225ed6e8aSDarrick J. Wong set_buffer_verified(bh); 154325ed6e8aSDarrick J. Wong 1544470decc6SDave Kleikamp return 0; 1545470decc6SDave Kleikamp 1546470decc6SDave Kleikamp out: 1547470decc6SDave Kleikamp journal_fail_superblock(journal); 1548470decc6SDave Kleikamp return err; 1549470decc6SDave Kleikamp } 1550470decc6SDave Kleikamp 1551470decc6SDave Kleikamp /* 1552470decc6SDave Kleikamp * Load the on-disk journal superblock and read the key fields into the 1553470decc6SDave Kleikamp * journal_t. 1554470decc6SDave Kleikamp */ 1555470decc6SDave Kleikamp 1556470decc6SDave Kleikamp static int load_superblock(journal_t *journal) 1557470decc6SDave Kleikamp { 1558470decc6SDave Kleikamp int err; 1559470decc6SDave Kleikamp journal_superblock_t *sb; 1560470decc6SDave Kleikamp 1561470decc6SDave Kleikamp err = journal_get_superblock(journal); 1562470decc6SDave Kleikamp if (err) 1563470decc6SDave Kleikamp return err; 1564470decc6SDave Kleikamp 1565470decc6SDave Kleikamp sb = journal->j_superblock; 1566470decc6SDave Kleikamp 1567470decc6SDave Kleikamp journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); 1568470decc6SDave Kleikamp journal->j_tail = be32_to_cpu(sb->s_start); 1569470decc6SDave Kleikamp journal->j_first = be32_to_cpu(sb->s_first); 1570470decc6SDave Kleikamp journal->j_last = be32_to_cpu(sb->s_maxlen); 1571470decc6SDave Kleikamp journal->j_errno = be32_to_cpu(sb->s_errno); 1572470decc6SDave Kleikamp 1573470decc6SDave Kleikamp return 0; 1574470decc6SDave Kleikamp } 1575470decc6SDave Kleikamp 1576470decc6SDave Kleikamp 1577470decc6SDave Kleikamp /** 1578f7f4bccbSMingming Cao * int jbd2_journal_load() - Read journal from disk. 1579470decc6SDave Kleikamp * @journal: Journal to act on. 1580470decc6SDave Kleikamp * 1581470decc6SDave Kleikamp * Given a journal_t structure which tells us which disk blocks contain 1582470decc6SDave Kleikamp * a journal, read the journal from disk to initialise the in-memory 1583470decc6SDave Kleikamp * structures. 1584470decc6SDave Kleikamp */ 1585f7f4bccbSMingming Cao int jbd2_journal_load(journal_t *journal) 1586470decc6SDave Kleikamp { 1587470decc6SDave Kleikamp int err; 1588470decc6SDave Kleikamp journal_superblock_t *sb; 1589470decc6SDave Kleikamp 1590470decc6SDave Kleikamp err = load_superblock(journal); 1591470decc6SDave Kleikamp if (err) 1592470decc6SDave Kleikamp return err; 1593470decc6SDave Kleikamp 1594470decc6SDave Kleikamp sb = journal->j_superblock; 1595470decc6SDave Kleikamp /* If this is a V2 superblock, then we have to check the 1596470decc6SDave Kleikamp * features flags on it. */ 1597470decc6SDave Kleikamp 1598470decc6SDave Kleikamp if (journal->j_format_version >= 2) { 1599470decc6SDave Kleikamp if ((sb->s_feature_ro_compat & 1600f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || 1601470decc6SDave Kleikamp (sb->s_feature_incompat & 1602f7f4bccbSMingming Cao ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { 1603470decc6SDave Kleikamp printk(KERN_WARNING 1604f2a44523SEryu Guan "JBD2: Unrecognised features on journal\n"); 1605470decc6SDave Kleikamp return -EINVAL; 1606470decc6SDave Kleikamp } 1607470decc6SDave Kleikamp } 1608470decc6SDave Kleikamp 1609d2eecb03STheodore Ts'o /* 1610d2eecb03STheodore Ts'o * Create a slab for this blocksize 1611d2eecb03STheodore Ts'o */ 1612d2eecb03STheodore Ts'o err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); 1613d2eecb03STheodore Ts'o if (err) 1614d2eecb03STheodore Ts'o return err; 1615d2eecb03STheodore Ts'o 1616470decc6SDave Kleikamp /* Let the recovery code check whether it needs to recover any 1617470decc6SDave Kleikamp * data from the journal. */ 1618f7f4bccbSMingming Cao if (jbd2_journal_recover(journal)) 1619470decc6SDave Kleikamp goto recovery_error; 1620470decc6SDave Kleikamp 1621e6a47428STheodore Ts'o if (journal->j_failed_commit) { 1622e6a47428STheodore Ts'o printk(KERN_ERR "JBD2: journal transaction %u on %s " 1623e6a47428STheodore Ts'o "is corrupt.\n", journal->j_failed_commit, 1624e6a47428STheodore Ts'o journal->j_devname); 1625e6a47428STheodore Ts'o return -EIO; 1626e6a47428STheodore Ts'o } 1627e6a47428STheodore Ts'o 1628470decc6SDave Kleikamp /* OK, we've finished with the dynamic journal bits: 1629470decc6SDave Kleikamp * reinitialise the dynamic contents of the superblock in memory 1630470decc6SDave Kleikamp * and reset them on disk. */ 1631470decc6SDave Kleikamp if (journal_reset(journal)) 1632470decc6SDave Kleikamp goto recovery_error; 1633470decc6SDave Kleikamp 1634f7f4bccbSMingming Cao journal->j_flags &= ~JBD2_ABORT; 1635f7f4bccbSMingming Cao journal->j_flags |= JBD2_LOADED; 1636470decc6SDave Kleikamp return 0; 1637470decc6SDave Kleikamp 1638470decc6SDave Kleikamp recovery_error: 1639f2a44523SEryu Guan printk(KERN_WARNING "JBD2: recovery failed\n"); 1640470decc6SDave Kleikamp return -EIO; 1641470decc6SDave Kleikamp } 1642470decc6SDave Kleikamp 1643470decc6SDave Kleikamp /** 1644f7f4bccbSMingming Cao * void jbd2_journal_destroy() - Release a journal_t structure. 1645470decc6SDave Kleikamp * @journal: Journal to act on. 1646470decc6SDave Kleikamp * 1647470decc6SDave Kleikamp * Release a journal_t structure once it is no longer in use by the 1648470decc6SDave Kleikamp * journaled object. 164944519fafSHidehiro Kawai * Return <0 if we couldn't clean up the journal. 1650470decc6SDave Kleikamp */ 165144519fafSHidehiro Kawai int jbd2_journal_destroy(journal_t *journal) 1652470decc6SDave Kleikamp { 165344519fafSHidehiro Kawai int err = 0; 165444519fafSHidehiro Kawai 1655470decc6SDave Kleikamp /* Wait for the commit thread to wake up and die. */ 1656470decc6SDave Kleikamp journal_kill_thread(journal); 1657470decc6SDave Kleikamp 1658470decc6SDave Kleikamp /* Force a final log commit */ 1659470decc6SDave Kleikamp if (journal->j_running_transaction) 1660f7f4bccbSMingming Cao jbd2_journal_commit_transaction(journal); 1661470decc6SDave Kleikamp 1662470decc6SDave Kleikamp /* Force any old transactions to disk */ 1663470decc6SDave Kleikamp 1664470decc6SDave Kleikamp /* Totally anal locking here... */ 1665470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1666470decc6SDave Kleikamp while (journal->j_checkpoint_transactions != NULL) { 1667470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 16681a0d3786STheodore Ts'o mutex_lock(&journal->j_checkpoint_mutex); 1669f7f4bccbSMingming Cao jbd2_log_do_checkpoint(journal); 16701a0d3786STheodore Ts'o mutex_unlock(&journal->j_checkpoint_mutex); 1671470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1672470decc6SDave Kleikamp } 1673470decc6SDave Kleikamp 1674470decc6SDave Kleikamp J_ASSERT(journal->j_running_transaction == NULL); 1675470decc6SDave Kleikamp J_ASSERT(journal->j_committing_transaction == NULL); 1676470decc6SDave Kleikamp J_ASSERT(journal->j_checkpoint_transactions == NULL); 1677470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 1678470decc6SDave Kleikamp 167944519fafSHidehiro Kawai if (journal->j_sb_buffer) { 168044519fafSHidehiro Kawai if (!is_journal_aborted(journal)) { 1681a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 168224bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1683a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1684a78bb11dSJan Kara } else 168544519fafSHidehiro Kawai err = -EIO; 1686470decc6SDave Kleikamp brelse(journal->j_sb_buffer); 1687470decc6SDave Kleikamp } 1688470decc6SDave Kleikamp 16898e85fb3fSJohann Lombardi if (journal->j_proc_entry) 16908e85fb3fSJohann Lombardi jbd2_stats_proc_exit(journal); 1691470decc6SDave Kleikamp if (journal->j_inode) 1692470decc6SDave Kleikamp iput(journal->j_inode); 1693470decc6SDave Kleikamp if (journal->j_revoke) 1694f7f4bccbSMingming Cao jbd2_journal_destroy_revoke(journal); 169501b5adceSDarrick J. Wong if (journal->j_chksum_driver) 169601b5adceSDarrick J. Wong crypto_free_shash(journal->j_chksum_driver); 1697470decc6SDave Kleikamp kfree(journal->j_wbuf); 1698470decc6SDave Kleikamp kfree(journal); 169944519fafSHidehiro Kawai 170044519fafSHidehiro Kawai return err; 1701470decc6SDave Kleikamp } 1702470decc6SDave Kleikamp 1703470decc6SDave Kleikamp 1704470decc6SDave Kleikamp /** 1705f7f4bccbSMingming Cao *int jbd2_journal_check_used_features () - Check if features specified are used. 1706470decc6SDave Kleikamp * @journal: Journal to check. 1707470decc6SDave Kleikamp * @compat: bitmask of compatible features 1708470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1709470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1710470decc6SDave Kleikamp * 1711470decc6SDave Kleikamp * Check whether the journal uses all of a given set of 1712470decc6SDave Kleikamp * features. Return true (non-zero) if it does. 1713470decc6SDave Kleikamp **/ 1714470decc6SDave Kleikamp 1715f7f4bccbSMingming Cao int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, 1716470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1717470decc6SDave Kleikamp { 1718470decc6SDave Kleikamp journal_superblock_t *sb; 1719470decc6SDave Kleikamp 1720470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1721470decc6SDave Kleikamp return 1; 17221113e1b5SPatrick J. LoPresti /* Load journal superblock if it is not loaded yet. */ 17231113e1b5SPatrick J. LoPresti if (journal->j_format_version == 0 && 17241113e1b5SPatrick J. LoPresti journal_get_superblock(journal) != 0) 17251113e1b5SPatrick J. LoPresti return 0; 1726470decc6SDave Kleikamp if (journal->j_format_version == 1) 1727470decc6SDave Kleikamp return 0; 1728470decc6SDave Kleikamp 1729470decc6SDave Kleikamp sb = journal->j_superblock; 1730470decc6SDave Kleikamp 1731470decc6SDave Kleikamp if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && 1732470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && 1733470decc6SDave Kleikamp ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) 1734470decc6SDave Kleikamp return 1; 1735470decc6SDave Kleikamp 1736470decc6SDave Kleikamp return 0; 1737470decc6SDave Kleikamp } 1738470decc6SDave Kleikamp 1739470decc6SDave Kleikamp /** 1740f7f4bccbSMingming Cao * int jbd2_journal_check_available_features() - Check feature set in journalling layer 1741470decc6SDave Kleikamp * @journal: Journal to check. 1742470decc6SDave Kleikamp * @compat: bitmask of compatible features 1743470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1744470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1745470decc6SDave Kleikamp * 1746470decc6SDave Kleikamp * Check whether the journaling code supports the use of 1747470decc6SDave Kleikamp * all of a given set of features on this journal. Return true 1748470decc6SDave Kleikamp * (non-zero) if it can. */ 1749470decc6SDave Kleikamp 1750f7f4bccbSMingming Cao int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, 1751470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1752470decc6SDave Kleikamp { 1753470decc6SDave Kleikamp if (!compat && !ro && !incompat) 1754470decc6SDave Kleikamp return 1; 1755470decc6SDave Kleikamp 1756470decc6SDave Kleikamp /* We can support any known requested features iff the 1757470decc6SDave Kleikamp * superblock is in version 2. Otherwise we fail to support any 1758470decc6SDave Kleikamp * extended sb features. */ 1759470decc6SDave Kleikamp 1760470decc6SDave Kleikamp if (journal->j_format_version != 2) 1761470decc6SDave Kleikamp return 0; 1762470decc6SDave Kleikamp 1763f7f4bccbSMingming Cao if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && 1764f7f4bccbSMingming Cao (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && 1765f7f4bccbSMingming Cao (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) 1766470decc6SDave Kleikamp return 1; 1767470decc6SDave Kleikamp 1768470decc6SDave Kleikamp return 0; 1769470decc6SDave Kleikamp } 1770470decc6SDave Kleikamp 1771470decc6SDave Kleikamp /** 1772f7f4bccbSMingming Cao * int jbd2_journal_set_features () - Mark a given journal feature in the superblock 1773470decc6SDave Kleikamp * @journal: Journal to act on. 1774470decc6SDave Kleikamp * @compat: bitmask of compatible features 1775470decc6SDave Kleikamp * @ro: bitmask of features that force read-only mount 1776470decc6SDave Kleikamp * @incompat: bitmask of incompatible features 1777470decc6SDave Kleikamp * 1778470decc6SDave Kleikamp * Mark a given journal feature as present on the 1779470decc6SDave Kleikamp * superblock. Returns true if the requested features could be set. 1780470decc6SDave Kleikamp * 1781470decc6SDave Kleikamp */ 1782470decc6SDave Kleikamp 1783f7f4bccbSMingming Cao int jbd2_journal_set_features (journal_t *journal, unsigned long compat, 1784470decc6SDave Kleikamp unsigned long ro, unsigned long incompat) 1785470decc6SDave Kleikamp { 178625ed6e8aSDarrick J. Wong #define INCOMPAT_FEATURE_ON(f) \ 178725ed6e8aSDarrick J. Wong ((incompat & (f)) && !(sb->s_feature_incompat & cpu_to_be32(f))) 178825ed6e8aSDarrick J. Wong #define COMPAT_FEATURE_ON(f) \ 178925ed6e8aSDarrick J. Wong ((compat & (f)) && !(sb->s_feature_compat & cpu_to_be32(f))) 1790470decc6SDave Kleikamp journal_superblock_t *sb; 1791470decc6SDave Kleikamp 1792f7f4bccbSMingming Cao if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) 1793470decc6SDave Kleikamp return 1; 1794470decc6SDave Kleikamp 1795f7f4bccbSMingming Cao if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) 1796470decc6SDave Kleikamp return 0; 1797470decc6SDave Kleikamp 179825ed6e8aSDarrick J. Wong /* Asking for checksumming v2 and v1? Only give them v2. */ 179925ed6e8aSDarrick J. Wong if (incompat & JBD2_FEATURE_INCOMPAT_CSUM_V2 && 180025ed6e8aSDarrick J. Wong compat & JBD2_FEATURE_COMPAT_CHECKSUM) 180125ed6e8aSDarrick J. Wong compat &= ~JBD2_FEATURE_COMPAT_CHECKSUM; 180225ed6e8aSDarrick J. Wong 1803470decc6SDave Kleikamp jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx\n", 1804470decc6SDave Kleikamp compat, ro, incompat); 1805470decc6SDave Kleikamp 1806470decc6SDave Kleikamp sb = journal->j_superblock; 1807470decc6SDave Kleikamp 180825ed6e8aSDarrick J. Wong /* If enabling v2 checksums, update superblock */ 180925ed6e8aSDarrick J. Wong if (INCOMPAT_FEATURE_ON(JBD2_FEATURE_INCOMPAT_CSUM_V2)) { 181025ed6e8aSDarrick J. Wong sb->s_checksum_type = JBD2_CRC32C_CHKSUM; 181125ed6e8aSDarrick J. Wong sb->s_feature_compat &= 181225ed6e8aSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM); 181301b5adceSDarrick J. Wong 181401b5adceSDarrick J. Wong /* Load the checksum driver */ 181501b5adceSDarrick J. Wong if (journal->j_chksum_driver == NULL) { 181601b5adceSDarrick J. Wong journal->j_chksum_driver = crypto_alloc_shash("crc32c", 181701b5adceSDarrick J. Wong 0, 0); 181801b5adceSDarrick J. Wong if (IS_ERR(journal->j_chksum_driver)) { 181901b5adceSDarrick J. Wong printk(KERN_ERR "JBD: Cannot load crc32c " 182001b5adceSDarrick J. Wong "driver.\n"); 182101b5adceSDarrick J. Wong journal->j_chksum_driver = NULL; 182201b5adceSDarrick J. Wong return 0; 182301b5adceSDarrick J. Wong } 182401b5adceSDarrick J. Wong } 18254fd5ea43SDarrick J. Wong 18264fd5ea43SDarrick J. Wong /* Precompute checksum seed for all metadata */ 18274fd5ea43SDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, 18284fd5ea43SDarrick J. Wong JBD2_FEATURE_INCOMPAT_CSUM_V2)) 18294fd5ea43SDarrick J. Wong journal->j_csum_seed = jbd2_chksum(journal, ~0, 18304fd5ea43SDarrick J. Wong sb->s_uuid, 18314fd5ea43SDarrick J. Wong sizeof(sb->s_uuid)); 183225ed6e8aSDarrick J. Wong } 183325ed6e8aSDarrick J. Wong 183425ed6e8aSDarrick J. Wong /* If enabling v1 checksums, downgrade superblock */ 183525ed6e8aSDarrick J. Wong if (COMPAT_FEATURE_ON(JBD2_FEATURE_COMPAT_CHECKSUM)) 183625ed6e8aSDarrick J. Wong sb->s_feature_incompat &= 183725ed6e8aSDarrick J. Wong ~cpu_to_be32(JBD2_FEATURE_INCOMPAT_CSUM_V2); 183825ed6e8aSDarrick J. Wong 1839470decc6SDave Kleikamp sb->s_feature_compat |= cpu_to_be32(compat); 1840470decc6SDave Kleikamp sb->s_feature_ro_compat |= cpu_to_be32(ro); 1841470decc6SDave Kleikamp sb->s_feature_incompat |= cpu_to_be32(incompat); 1842470decc6SDave Kleikamp 1843470decc6SDave Kleikamp return 1; 184425ed6e8aSDarrick J. Wong #undef COMPAT_FEATURE_ON 184525ed6e8aSDarrick J. Wong #undef INCOMPAT_FEATURE_ON 1846470decc6SDave Kleikamp } 1847470decc6SDave Kleikamp 1848818d276cSGirish Shilamkar /* 1849818d276cSGirish Shilamkar * jbd2_journal_clear_features () - Clear a given journal feature in the 1850818d276cSGirish Shilamkar * superblock 1851818d276cSGirish Shilamkar * @journal: Journal to act on. 1852818d276cSGirish Shilamkar * @compat: bitmask of compatible features 1853818d276cSGirish Shilamkar * @ro: bitmask of features that force read-only mount 1854818d276cSGirish Shilamkar * @incompat: bitmask of incompatible features 1855818d276cSGirish Shilamkar * 1856818d276cSGirish Shilamkar * Clear a given journal feature as present on the 1857818d276cSGirish Shilamkar * superblock. 1858818d276cSGirish Shilamkar */ 1859818d276cSGirish Shilamkar void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, 1860818d276cSGirish Shilamkar unsigned long ro, unsigned long incompat) 1861818d276cSGirish Shilamkar { 1862818d276cSGirish Shilamkar journal_superblock_t *sb; 1863818d276cSGirish Shilamkar 1864818d276cSGirish Shilamkar jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx\n", 1865818d276cSGirish Shilamkar compat, ro, incompat); 1866818d276cSGirish Shilamkar 1867818d276cSGirish Shilamkar sb = journal->j_superblock; 1868818d276cSGirish Shilamkar 1869818d276cSGirish Shilamkar sb->s_feature_compat &= ~cpu_to_be32(compat); 1870818d276cSGirish Shilamkar sb->s_feature_ro_compat &= ~cpu_to_be32(ro); 1871818d276cSGirish Shilamkar sb->s_feature_incompat &= ~cpu_to_be32(incompat); 1872818d276cSGirish Shilamkar } 1873818d276cSGirish Shilamkar EXPORT_SYMBOL(jbd2_journal_clear_features); 1874470decc6SDave Kleikamp 1875470decc6SDave Kleikamp /** 1876f7f4bccbSMingming Cao * int jbd2_journal_flush () - Flush journal 1877470decc6SDave Kleikamp * @journal: Journal to act on. 1878470decc6SDave Kleikamp * 1879470decc6SDave Kleikamp * Flush all data for a given journal to disk and empty the journal. 1880470decc6SDave Kleikamp * Filesystems can use this when remounting readonly to ensure that 1881470decc6SDave Kleikamp * recovery does not need to happen on remount. 1882470decc6SDave Kleikamp */ 1883470decc6SDave Kleikamp 1884f7f4bccbSMingming Cao int jbd2_journal_flush(journal_t *journal) 1885470decc6SDave Kleikamp { 1886470decc6SDave Kleikamp int err = 0; 1887470decc6SDave Kleikamp transaction_t *transaction = NULL; 1888470decc6SDave Kleikamp 1889a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1890470decc6SDave Kleikamp 1891470decc6SDave Kleikamp /* Force everything buffered to the log... */ 1892470decc6SDave Kleikamp if (journal->j_running_transaction) { 1893470decc6SDave Kleikamp transaction = journal->j_running_transaction; 1894f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 1895470decc6SDave Kleikamp } else if (journal->j_committing_transaction) 1896470decc6SDave Kleikamp transaction = journal->j_committing_transaction; 1897470decc6SDave Kleikamp 1898470decc6SDave Kleikamp /* Wait for the log commit to complete... */ 1899470decc6SDave Kleikamp if (transaction) { 1900470decc6SDave Kleikamp tid_t tid = transaction->t_tid; 1901470decc6SDave Kleikamp 1902a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1903f7f4bccbSMingming Cao jbd2_log_wait_commit(journal, tid); 1904470decc6SDave Kleikamp } else { 1905a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 1906470decc6SDave Kleikamp } 1907470decc6SDave Kleikamp 1908470decc6SDave Kleikamp /* ...and flush everything in the log out to disk. */ 1909470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1910470decc6SDave Kleikamp while (!err && journal->j_checkpoint_transactions != NULL) { 1911470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 191244519fafSHidehiro Kawai mutex_lock(&journal->j_checkpoint_mutex); 1913f7f4bccbSMingming Cao err = jbd2_log_do_checkpoint(journal); 191444519fafSHidehiro Kawai mutex_unlock(&journal->j_checkpoint_mutex); 1915470decc6SDave Kleikamp spin_lock(&journal->j_list_lock); 1916470decc6SDave Kleikamp } 1917470decc6SDave Kleikamp spin_unlock(&journal->j_list_lock); 191844519fafSHidehiro Kawai 191944519fafSHidehiro Kawai if (is_journal_aborted(journal)) 192044519fafSHidehiro Kawai return -EIO; 192144519fafSHidehiro Kawai 1922a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 1923f7f4bccbSMingming Cao jbd2_cleanup_journal_tail(journal); 1924470decc6SDave Kleikamp 1925470decc6SDave Kleikamp /* Finally, mark the journal as really needing no recovery. 1926470decc6SDave Kleikamp * This sets s_start==0 in the underlying superblock, which is 1927470decc6SDave Kleikamp * the magic code for a fully-recovered superblock. Any future 1928470decc6SDave Kleikamp * commits of data to the journal will restore the current 1929470decc6SDave Kleikamp * s_start value. */ 193024bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1931a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1932a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 1933470decc6SDave Kleikamp J_ASSERT(!journal->j_running_transaction); 1934470decc6SDave Kleikamp J_ASSERT(!journal->j_committing_transaction); 1935470decc6SDave Kleikamp J_ASSERT(!journal->j_checkpoint_transactions); 1936470decc6SDave Kleikamp J_ASSERT(journal->j_head == journal->j_tail); 1937470decc6SDave Kleikamp J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); 1938a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 193944519fafSHidehiro Kawai return 0; 1940470decc6SDave Kleikamp } 1941470decc6SDave Kleikamp 1942470decc6SDave Kleikamp /** 1943f7f4bccbSMingming Cao * int jbd2_journal_wipe() - Wipe journal contents 1944470decc6SDave Kleikamp * @journal: Journal to act on. 1945470decc6SDave Kleikamp * @write: flag (see below) 1946470decc6SDave Kleikamp * 1947470decc6SDave Kleikamp * Wipe out all of the contents of a journal, safely. This will produce 1948470decc6SDave Kleikamp * a warning if the journal contains any valid recovery information. 1949f7f4bccbSMingming Cao * Must be called between journal_init_*() and jbd2_journal_load(). 1950470decc6SDave Kleikamp * 1951470decc6SDave Kleikamp * If 'write' is non-zero, then we wipe out the journal on disk; otherwise 1952470decc6SDave Kleikamp * we merely suppress recovery. 1953470decc6SDave Kleikamp */ 1954470decc6SDave Kleikamp 1955f7f4bccbSMingming Cao int jbd2_journal_wipe(journal_t *journal, int write) 1956470decc6SDave Kleikamp { 1957470decc6SDave Kleikamp int err = 0; 1958470decc6SDave Kleikamp 1959f7f4bccbSMingming Cao J_ASSERT (!(journal->j_flags & JBD2_LOADED)); 1960470decc6SDave Kleikamp 1961470decc6SDave Kleikamp err = load_superblock(journal); 1962470decc6SDave Kleikamp if (err) 1963470decc6SDave Kleikamp return err; 1964470decc6SDave Kleikamp 1965470decc6SDave Kleikamp if (!journal->j_tail) 1966470decc6SDave Kleikamp goto no_recovery; 1967470decc6SDave Kleikamp 1968f2a44523SEryu Guan printk(KERN_WARNING "JBD2: %s recovery information on journal\n", 1969470decc6SDave Kleikamp write ? "Clearing" : "Ignoring"); 1970470decc6SDave Kleikamp 1971f7f4bccbSMingming Cao err = jbd2_journal_skip_recovery(journal); 1972a78bb11dSJan Kara if (write) { 1973a78bb11dSJan Kara /* Lock to make assertions happy... */ 1974a78bb11dSJan Kara mutex_lock(&journal->j_checkpoint_mutex); 197524bcc89cSJan Kara jbd2_mark_journal_empty(journal); 1976a78bb11dSJan Kara mutex_unlock(&journal->j_checkpoint_mutex); 1977a78bb11dSJan Kara } 1978470decc6SDave Kleikamp 1979470decc6SDave Kleikamp no_recovery: 1980470decc6SDave Kleikamp return err; 1981470decc6SDave Kleikamp } 1982470decc6SDave Kleikamp 1983470decc6SDave Kleikamp /* 1984470decc6SDave Kleikamp * Journal abort has very specific semantics, which we describe 1985470decc6SDave Kleikamp * for journal abort. 1986470decc6SDave Kleikamp * 1987bfcd3555SAlberto Bertogli * Two internal functions, which provide abort to the jbd layer 1988470decc6SDave Kleikamp * itself are here. 1989470decc6SDave Kleikamp */ 1990470decc6SDave Kleikamp 1991470decc6SDave Kleikamp /* 1992470decc6SDave Kleikamp * Quick version for internal journal use (doesn't lock the journal). 1993470decc6SDave Kleikamp * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, 1994470decc6SDave Kleikamp * and don't attempt to make any other journal updates. 1995470decc6SDave Kleikamp */ 1996f7f4bccbSMingming Cao void __jbd2_journal_abort_hard(journal_t *journal) 1997470decc6SDave Kleikamp { 1998470decc6SDave Kleikamp transaction_t *transaction; 1999470decc6SDave Kleikamp 2000f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2001470decc6SDave Kleikamp return; 2002470decc6SDave Kleikamp 2003470decc6SDave Kleikamp printk(KERN_ERR "Aborting journal on device %s.\n", 200405496769STheodore Ts'o journal->j_devname); 2005470decc6SDave Kleikamp 2006a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2007f7f4bccbSMingming Cao journal->j_flags |= JBD2_ABORT; 2008470decc6SDave Kleikamp transaction = journal->j_running_transaction; 2009470decc6SDave Kleikamp if (transaction) 2010f7f4bccbSMingming Cao __jbd2_log_start_commit(journal, transaction->t_tid); 2011a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2012470decc6SDave Kleikamp } 2013470decc6SDave Kleikamp 2014470decc6SDave Kleikamp /* Soft abort: record the abort error status in the journal superblock, 2015470decc6SDave Kleikamp * but don't do any other IO. */ 2016470decc6SDave Kleikamp static void __journal_abort_soft (journal_t *journal, int errno) 2017470decc6SDave Kleikamp { 2018f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2019470decc6SDave Kleikamp return; 2020470decc6SDave Kleikamp 2021470decc6SDave Kleikamp if (!journal->j_errno) 2022470decc6SDave Kleikamp journal->j_errno = errno; 2023470decc6SDave Kleikamp 2024f7f4bccbSMingming Cao __jbd2_journal_abort_hard(journal); 2025470decc6SDave Kleikamp 2026470decc6SDave Kleikamp if (errno) 202724bcc89cSJan Kara jbd2_journal_update_sb_errno(journal); 2028470decc6SDave Kleikamp } 2029470decc6SDave Kleikamp 2030470decc6SDave Kleikamp /** 2031f7f4bccbSMingming Cao * void jbd2_journal_abort () - Shutdown the journal immediately. 2032470decc6SDave Kleikamp * @journal: the journal to shutdown. 2033470decc6SDave Kleikamp * @errno: an error number to record in the journal indicating 2034470decc6SDave Kleikamp * the reason for the shutdown. 2035470decc6SDave Kleikamp * 2036470decc6SDave Kleikamp * Perform a complete, immediate shutdown of the ENTIRE 2037470decc6SDave Kleikamp * journal (not of a single transaction). This operation cannot be 2038470decc6SDave Kleikamp * undone without closing and reopening the journal. 2039470decc6SDave Kleikamp * 2040f7f4bccbSMingming Cao * The jbd2_journal_abort function is intended to support higher level error 2041470decc6SDave Kleikamp * recovery mechanisms such as the ext2/ext3 remount-readonly error 2042470decc6SDave Kleikamp * mode. 2043470decc6SDave Kleikamp * 2044470decc6SDave Kleikamp * Journal abort has very specific semantics. Any existing dirty, 2045470decc6SDave Kleikamp * unjournaled buffers in the main filesystem will still be written to 2046470decc6SDave Kleikamp * disk by bdflush, but the journaling mechanism will be suspended 2047470decc6SDave Kleikamp * immediately and no further transaction commits will be honoured. 2048470decc6SDave Kleikamp * 2049470decc6SDave Kleikamp * Any dirty, journaled buffers will be written back to disk without 2050470decc6SDave Kleikamp * hitting the journal. Atomicity cannot be guaranteed on an aborted 2051470decc6SDave Kleikamp * filesystem, but we _do_ attempt to leave as much data as possible 2052470decc6SDave Kleikamp * behind for fsck to use for cleanup. 2053470decc6SDave Kleikamp * 2054470decc6SDave Kleikamp * Any attempt to get a new transaction handle on a journal which is in 2055470decc6SDave Kleikamp * ABORT state will just result in an -EROFS error return. A 2056f7f4bccbSMingming Cao * jbd2_journal_stop on an existing handle will return -EIO if we have 2057470decc6SDave Kleikamp * entered abort state during the update. 2058470decc6SDave Kleikamp * 2059470decc6SDave Kleikamp * Recursive transactions are not disturbed by journal abort until the 2060f7f4bccbSMingming Cao * final jbd2_journal_stop, which will receive the -EIO error. 2061470decc6SDave Kleikamp * 2062f7f4bccbSMingming Cao * Finally, the jbd2_journal_abort call allows the caller to supply an errno 2063470decc6SDave Kleikamp * which will be recorded (if possible) in the journal superblock. This 2064470decc6SDave Kleikamp * allows a client to record failure conditions in the middle of a 2065470decc6SDave Kleikamp * transaction without having to complete the transaction to record the 2066470decc6SDave Kleikamp * failure to disk. ext3_error, for example, now uses this 2067470decc6SDave Kleikamp * functionality. 2068470decc6SDave Kleikamp * 2069470decc6SDave Kleikamp * Errors which originate from within the journaling layer will NOT 2070470decc6SDave Kleikamp * supply an errno; a null errno implies that absolutely no further 2071470decc6SDave Kleikamp * writes are done to the journal (unless there are any already in 2072470decc6SDave Kleikamp * progress). 2073470decc6SDave Kleikamp * 2074470decc6SDave Kleikamp */ 2075470decc6SDave Kleikamp 2076f7f4bccbSMingming Cao void jbd2_journal_abort(journal_t *journal, int errno) 2077470decc6SDave Kleikamp { 2078470decc6SDave Kleikamp __journal_abort_soft(journal, errno); 2079470decc6SDave Kleikamp } 2080470decc6SDave Kleikamp 2081470decc6SDave Kleikamp /** 2082f7f4bccbSMingming Cao * int jbd2_journal_errno () - returns the journal's error state. 2083470decc6SDave Kleikamp * @journal: journal to examine. 2084470decc6SDave Kleikamp * 2085bfcd3555SAlberto Bertogli * This is the errno number set with jbd2_journal_abort(), the last 2086470decc6SDave Kleikamp * time the journal was mounted - if the journal was stopped 2087470decc6SDave Kleikamp * without calling abort this will be 0. 2088470decc6SDave Kleikamp * 2089470decc6SDave Kleikamp * If the journal has been aborted on this mount time -EROFS will 2090470decc6SDave Kleikamp * be returned. 2091470decc6SDave Kleikamp */ 2092f7f4bccbSMingming Cao int jbd2_journal_errno(journal_t *journal) 2093470decc6SDave Kleikamp { 2094470decc6SDave Kleikamp int err; 2095470decc6SDave Kleikamp 2096a931da6aSTheodore Ts'o read_lock(&journal->j_state_lock); 2097f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2098470decc6SDave Kleikamp err = -EROFS; 2099470decc6SDave Kleikamp else 2100470decc6SDave Kleikamp err = journal->j_errno; 2101a931da6aSTheodore Ts'o read_unlock(&journal->j_state_lock); 2102470decc6SDave Kleikamp return err; 2103470decc6SDave Kleikamp } 2104470decc6SDave Kleikamp 2105470decc6SDave Kleikamp /** 2106f7f4bccbSMingming Cao * int jbd2_journal_clear_err () - clears the journal's error state 2107470decc6SDave Kleikamp * @journal: journal to act on. 2108470decc6SDave Kleikamp * 2109bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 2110470decc6SDave Kleikamp * mode. 2111470decc6SDave Kleikamp */ 2112f7f4bccbSMingming Cao int jbd2_journal_clear_err(journal_t *journal) 2113470decc6SDave Kleikamp { 2114470decc6SDave Kleikamp int err = 0; 2115470decc6SDave Kleikamp 2116a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2117f7f4bccbSMingming Cao if (journal->j_flags & JBD2_ABORT) 2118470decc6SDave Kleikamp err = -EROFS; 2119470decc6SDave Kleikamp else 2120470decc6SDave Kleikamp journal->j_errno = 0; 2121a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2122470decc6SDave Kleikamp return err; 2123470decc6SDave Kleikamp } 2124470decc6SDave Kleikamp 2125470decc6SDave Kleikamp /** 2126f7f4bccbSMingming Cao * void jbd2_journal_ack_err() - Ack journal err. 2127470decc6SDave Kleikamp * @journal: journal to act on. 2128470decc6SDave Kleikamp * 2129bfcd3555SAlberto Bertogli * An error must be cleared or acked to take a FS out of readonly 2130470decc6SDave Kleikamp * mode. 2131470decc6SDave Kleikamp */ 2132f7f4bccbSMingming Cao void jbd2_journal_ack_err(journal_t *journal) 2133470decc6SDave Kleikamp { 2134a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 2135470decc6SDave Kleikamp if (journal->j_errno) 2136f7f4bccbSMingming Cao journal->j_flags |= JBD2_ACK_ERR; 2137a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 2138470decc6SDave Kleikamp } 2139470decc6SDave Kleikamp 2140f7f4bccbSMingming Cao int jbd2_journal_blocks_per_page(struct inode *inode) 2141470decc6SDave Kleikamp { 2142470decc6SDave Kleikamp return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 2143470decc6SDave Kleikamp } 2144470decc6SDave Kleikamp 2145470decc6SDave Kleikamp /* 2146b517bea1SZach Brown * helper functions to deal with 32 or 64bit block numbers. 2147b517bea1SZach Brown */ 2148b517bea1SZach Brown size_t journal_tag_bytes(journal_t *journal) 2149b517bea1SZach Brown { 2150c3900875SDarrick J. Wong journal_block_tag_t tag; 2151c3900875SDarrick J. Wong size_t x = 0; 2152c3900875SDarrick J. Wong 2153c3900875SDarrick J. Wong if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2)) 2154c3900875SDarrick J. Wong x += sizeof(tag.t_checksum); 2155c3900875SDarrick J. Wong 2156b517bea1SZach Brown if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) 2157c3900875SDarrick J. Wong return x + JBD2_TAG_SIZE64; 2158b517bea1SZach Brown else 2159c3900875SDarrick J. Wong return x + JBD2_TAG_SIZE32; 2160b517bea1SZach Brown } 2161b517bea1SZach Brown 2162b517bea1SZach Brown /* 2163d2eecb03STheodore Ts'o * JBD memory management 2164d2eecb03STheodore Ts'o * 2165d2eecb03STheodore Ts'o * These functions are used to allocate block-sized chunks of memory 2166d2eecb03STheodore Ts'o * used for making copies of buffer_head data. Very often it will be 2167d2eecb03STheodore Ts'o * page-sized chunks of data, but sometimes it will be in 2168d2eecb03STheodore Ts'o * sub-page-size chunks. (For example, 16k pages on Power systems 2169d2eecb03STheodore Ts'o * with a 4k block file system.) For blocks smaller than a page, we 2170d2eecb03STheodore Ts'o * use a SLAB allocator. There are slab caches for each block size, 2171d2eecb03STheodore Ts'o * which are allocated at mount time, if necessary, and we only free 2172d2eecb03STheodore Ts'o * (all of) the slab caches when/if the jbd2 module is unloaded. For 2173d2eecb03STheodore Ts'o * this reason we don't need to a mutex to protect access to 2174d2eecb03STheodore Ts'o * jbd2_slab[] allocating or releasing memory; only in 2175d2eecb03STheodore Ts'o * jbd2_journal_create_slab(). 2176d2eecb03STheodore Ts'o */ 2177d2eecb03STheodore Ts'o #define JBD2_MAX_SLABS 8 2178d2eecb03STheodore Ts'o static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; 2179d2eecb03STheodore Ts'o 2180d2eecb03STheodore Ts'o static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { 2181d2eecb03STheodore Ts'o "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", 2182d2eecb03STheodore Ts'o "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" 2183d2eecb03STheodore Ts'o }; 2184d2eecb03STheodore Ts'o 2185d2eecb03STheodore Ts'o 2186d2eecb03STheodore Ts'o static void jbd2_journal_destroy_slabs(void) 2187d2eecb03STheodore Ts'o { 2188d2eecb03STheodore Ts'o int i; 2189d2eecb03STheodore Ts'o 2190d2eecb03STheodore Ts'o for (i = 0; i < JBD2_MAX_SLABS; i++) { 2191d2eecb03STheodore Ts'o if (jbd2_slab[i]) 2192d2eecb03STheodore Ts'o kmem_cache_destroy(jbd2_slab[i]); 2193d2eecb03STheodore Ts'o jbd2_slab[i] = NULL; 2194d2eecb03STheodore Ts'o } 2195d2eecb03STheodore Ts'o } 2196d2eecb03STheodore Ts'o 2197d2eecb03STheodore Ts'o static int jbd2_journal_create_slab(size_t size) 2198d2eecb03STheodore Ts'o { 219951dfacdeSThomas Gleixner static DEFINE_MUTEX(jbd2_slab_create_mutex); 2200d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2201d2eecb03STheodore Ts'o size_t slab_size; 2202d2eecb03STheodore Ts'o 2203d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2204d2eecb03STheodore Ts'o return 0; 2205d2eecb03STheodore Ts'o 2206d2eecb03STheodore Ts'o if (i >= JBD2_MAX_SLABS) 2207d2eecb03STheodore Ts'o return -EINVAL; 2208d2eecb03STheodore Ts'o 2209d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2210d2eecb03STheodore Ts'o i = 0; 221151dfacdeSThomas Gleixner mutex_lock(&jbd2_slab_create_mutex); 2212d2eecb03STheodore Ts'o if (jbd2_slab[i]) { 221351dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2214d2eecb03STheodore Ts'o return 0; /* Already created */ 2215d2eecb03STheodore Ts'o } 2216d2eecb03STheodore Ts'o 2217d2eecb03STheodore Ts'o slab_size = 1 << (i+10); 2218d2eecb03STheodore Ts'o jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, 2219d2eecb03STheodore Ts'o slab_size, 0, NULL); 222051dfacdeSThomas Gleixner mutex_unlock(&jbd2_slab_create_mutex); 2221d2eecb03STheodore Ts'o if (!jbd2_slab[i]) { 2222d2eecb03STheodore Ts'o printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache\n"); 2223d2eecb03STheodore Ts'o return -ENOMEM; 2224d2eecb03STheodore Ts'o } 2225d2eecb03STheodore Ts'o return 0; 2226d2eecb03STheodore Ts'o } 2227d2eecb03STheodore Ts'o 2228d2eecb03STheodore Ts'o static struct kmem_cache *get_slab(size_t size) 2229d2eecb03STheodore Ts'o { 2230d2eecb03STheodore Ts'o int i = order_base_2(size) - 10; 2231d2eecb03STheodore Ts'o 2232d2eecb03STheodore Ts'o BUG_ON(i >= JBD2_MAX_SLABS); 2233d2eecb03STheodore Ts'o if (unlikely(i < 0)) 2234d2eecb03STheodore Ts'o i = 0; 22358ac97b74SBill Pemberton BUG_ON(jbd2_slab[i] == NULL); 2236d2eecb03STheodore Ts'o return jbd2_slab[i]; 2237d2eecb03STheodore Ts'o } 2238d2eecb03STheodore Ts'o 2239d2eecb03STheodore Ts'o void *jbd2_alloc(size_t size, gfp_t flags) 2240d2eecb03STheodore Ts'o { 2241d2eecb03STheodore Ts'o void *ptr; 2242d2eecb03STheodore Ts'o 2243d2eecb03STheodore Ts'o BUG_ON(size & (size-1)); /* Must be a power of 2 */ 2244d2eecb03STheodore Ts'o 2245d2eecb03STheodore Ts'o flags |= __GFP_REPEAT; 2246d2eecb03STheodore Ts'o if (size == PAGE_SIZE) 2247d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, 0); 2248d2eecb03STheodore Ts'o else if (size > PAGE_SIZE) { 2249d2eecb03STheodore Ts'o int order = get_order(size); 2250d2eecb03STheodore Ts'o 2251d2eecb03STheodore Ts'o if (order < 3) 2252d2eecb03STheodore Ts'o ptr = (void *)__get_free_pages(flags, order); 2253d2eecb03STheodore Ts'o else 2254d2eecb03STheodore Ts'o ptr = vmalloc(size); 2255d2eecb03STheodore Ts'o } else 2256d2eecb03STheodore Ts'o ptr = kmem_cache_alloc(get_slab(size), flags); 2257d2eecb03STheodore Ts'o 2258d2eecb03STheodore Ts'o /* Check alignment; SLUB has gotten this wrong in the past, 2259d2eecb03STheodore Ts'o * and this can lead to user data corruption! */ 2260d2eecb03STheodore Ts'o BUG_ON(((unsigned long) ptr) & (size-1)); 2261d2eecb03STheodore Ts'o 2262d2eecb03STheodore Ts'o return ptr; 2263d2eecb03STheodore Ts'o } 2264d2eecb03STheodore Ts'o 2265d2eecb03STheodore Ts'o void jbd2_free(void *ptr, size_t size) 2266d2eecb03STheodore Ts'o { 2267d2eecb03STheodore Ts'o if (size == PAGE_SIZE) { 2268d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, 0); 2269d2eecb03STheodore Ts'o return; 2270d2eecb03STheodore Ts'o } 2271d2eecb03STheodore Ts'o if (size > PAGE_SIZE) { 2272d2eecb03STheodore Ts'o int order = get_order(size); 2273d2eecb03STheodore Ts'o 2274d2eecb03STheodore Ts'o if (order < 3) 2275d2eecb03STheodore Ts'o free_pages((unsigned long)ptr, order); 2276d2eecb03STheodore Ts'o else 2277d2eecb03STheodore Ts'o vfree(ptr); 2278d2eecb03STheodore Ts'o return; 2279d2eecb03STheodore Ts'o } 2280d2eecb03STheodore Ts'o kmem_cache_free(get_slab(size), ptr); 2281d2eecb03STheodore Ts'o }; 2282d2eecb03STheodore Ts'o 2283d2eecb03STheodore Ts'o /* 2284470decc6SDave Kleikamp * Journal_head storage management 2285470decc6SDave Kleikamp */ 2286e18b890bSChristoph Lameter static struct kmem_cache *jbd2_journal_head_cache; 2287e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2288470decc6SDave Kleikamp static atomic_t nr_journal_heads = ATOMIC_INIT(0); 2289470decc6SDave Kleikamp #endif 2290470decc6SDave Kleikamp 22914185a2acSYongqiang Yang static int jbd2_journal_init_journal_head_cache(void) 2292470decc6SDave Kleikamp { 2293470decc6SDave Kleikamp int retval; 2294470decc6SDave Kleikamp 22951076d17aSAl Viro J_ASSERT(jbd2_journal_head_cache == NULL); 2296a920e941SJohann Lombardi jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", 2297470decc6SDave Kleikamp sizeof(struct journal_head), 2298470decc6SDave Kleikamp 0, /* offset */ 229977160957SMingming Cao SLAB_TEMPORARY, /* flags */ 230020c2df83SPaul Mundt NULL); /* ctor */ 2301470decc6SDave Kleikamp retval = 0; 23021076d17aSAl Viro if (!jbd2_journal_head_cache) { 2303470decc6SDave Kleikamp retval = -ENOMEM; 2304f2a44523SEryu Guan printk(KERN_EMERG "JBD2: no memory for journal_head cache\n"); 2305470decc6SDave Kleikamp } 2306470decc6SDave Kleikamp return retval; 2307470decc6SDave Kleikamp } 2308470decc6SDave Kleikamp 23094185a2acSYongqiang Yang static void jbd2_journal_destroy_journal_head_cache(void) 2310470decc6SDave Kleikamp { 23118a9362ebSDuane Griffin if (jbd2_journal_head_cache) { 2312f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_journal_head_cache); 2313f7f4bccbSMingming Cao jbd2_journal_head_cache = NULL; 2314470decc6SDave Kleikamp } 23158a9362ebSDuane Griffin } 2316470decc6SDave Kleikamp 2317470decc6SDave Kleikamp /* 2318470decc6SDave Kleikamp * journal_head splicing and dicing 2319470decc6SDave Kleikamp */ 2320470decc6SDave Kleikamp static struct journal_head *journal_alloc_journal_head(void) 2321470decc6SDave Kleikamp { 2322470decc6SDave Kleikamp struct journal_head *ret; 2323470decc6SDave Kleikamp 2324e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2325470decc6SDave Kleikamp atomic_inc(&nr_journal_heads); 2326470decc6SDave Kleikamp #endif 23275d9cf9c6SZheng Liu ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS); 23281076d17aSAl Viro if (!ret) { 2329470decc6SDave Kleikamp jbd_debug(1, "out of memory for journal_head\n"); 2330670be5a7STheodore Ts'o pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__); 23311076d17aSAl Viro while (!ret) { 2332470decc6SDave Kleikamp yield(); 23335d9cf9c6SZheng Liu ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS); 2334470decc6SDave Kleikamp } 2335470decc6SDave Kleikamp } 2336470decc6SDave Kleikamp return ret; 2337470decc6SDave Kleikamp } 2338470decc6SDave Kleikamp 2339470decc6SDave Kleikamp static void journal_free_journal_head(struct journal_head *jh) 2340470decc6SDave Kleikamp { 2341e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2342470decc6SDave Kleikamp atomic_dec(&nr_journal_heads); 2343cd02ff0bSMingming Cao memset(jh, JBD2_POISON_FREE, sizeof(*jh)); 2344470decc6SDave Kleikamp #endif 2345f7f4bccbSMingming Cao kmem_cache_free(jbd2_journal_head_cache, jh); 2346470decc6SDave Kleikamp } 2347470decc6SDave Kleikamp 2348470decc6SDave Kleikamp /* 2349470decc6SDave Kleikamp * A journal_head is attached to a buffer_head whenever JBD has an 2350470decc6SDave Kleikamp * interest in the buffer. 2351470decc6SDave Kleikamp * 2352470decc6SDave Kleikamp * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit 2353470decc6SDave Kleikamp * is set. This bit is tested in core kernel code where we need to take 2354470decc6SDave Kleikamp * JBD-specific actions. Testing the zeroness of ->b_private is not reliable 2355470decc6SDave Kleikamp * there. 2356470decc6SDave Kleikamp * 2357470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. 2358470decc6SDave Kleikamp * 2359470decc6SDave Kleikamp * When a buffer has its BH_JBD bit set it is immune from being released by 2360470decc6SDave Kleikamp * core kernel code, mainly via ->b_count. 2361470decc6SDave Kleikamp * 2362de1b7941SJan Kara * A journal_head is detached from its buffer_head when the journal_head's 2363de1b7941SJan Kara * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint 2364de1b7941SJan Kara * transaction (b_cp_transaction) hold their references to b_jcount. 2365470decc6SDave Kleikamp * 2366470decc6SDave Kleikamp * Various places in the kernel want to attach a journal_head to a buffer_head 2367470decc6SDave Kleikamp * _before_ attaching the journal_head to a transaction. To protect the 2368f7f4bccbSMingming Cao * journal_head in this situation, jbd2_journal_add_journal_head elevates the 2369470decc6SDave Kleikamp * journal_head's b_jcount refcount by one. The caller must call 2370f7f4bccbSMingming Cao * jbd2_journal_put_journal_head() to undo this. 2371470decc6SDave Kleikamp * 2372470decc6SDave Kleikamp * So the typical usage would be: 2373470decc6SDave Kleikamp * 2374470decc6SDave Kleikamp * (Attach a journal_head if needed. Increments b_jcount) 2375f7f4bccbSMingming Cao * struct journal_head *jh = jbd2_journal_add_journal_head(bh); 2376470decc6SDave Kleikamp * ... 2377de1b7941SJan Kara * (Get another reference for transaction) 2378de1b7941SJan Kara * jbd2_journal_grab_journal_head(bh); 2379470decc6SDave Kleikamp * jh->b_transaction = xxx; 2380de1b7941SJan Kara * (Put original reference) 2381f7f4bccbSMingming Cao * jbd2_journal_put_journal_head(jh); 2382470decc6SDave Kleikamp */ 2383470decc6SDave Kleikamp 2384470decc6SDave Kleikamp /* 2385470decc6SDave Kleikamp * Give a buffer_head a journal_head. 2386470decc6SDave Kleikamp * 2387470decc6SDave Kleikamp * May sleep. 2388470decc6SDave Kleikamp */ 2389f7f4bccbSMingming Cao struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) 2390470decc6SDave Kleikamp { 2391470decc6SDave Kleikamp struct journal_head *jh; 2392470decc6SDave Kleikamp struct journal_head *new_jh = NULL; 2393470decc6SDave Kleikamp 2394470decc6SDave Kleikamp repeat: 23955d9cf9c6SZheng Liu if (!buffer_jbd(bh)) 2396470decc6SDave Kleikamp new_jh = journal_alloc_journal_head(); 2397470decc6SDave Kleikamp 2398470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2399470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2400470decc6SDave Kleikamp jh = bh2jh(bh); 2401470decc6SDave Kleikamp } else { 2402470decc6SDave Kleikamp J_ASSERT_BH(bh, 2403470decc6SDave Kleikamp (atomic_read(&bh->b_count) > 0) || 2404470decc6SDave Kleikamp (bh->b_page && bh->b_page->mapping)); 2405470decc6SDave Kleikamp 2406470decc6SDave Kleikamp if (!new_jh) { 2407470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2408470decc6SDave Kleikamp goto repeat; 2409470decc6SDave Kleikamp } 2410470decc6SDave Kleikamp 2411470decc6SDave Kleikamp jh = new_jh; 2412470decc6SDave Kleikamp new_jh = NULL; /* We consumed it */ 2413470decc6SDave Kleikamp set_buffer_jbd(bh); 2414470decc6SDave Kleikamp bh->b_private = jh; 2415470decc6SDave Kleikamp jh->b_bh = bh; 2416470decc6SDave Kleikamp get_bh(bh); 2417470decc6SDave Kleikamp BUFFER_TRACE(bh, "added journal_head"); 2418470decc6SDave Kleikamp } 2419470decc6SDave Kleikamp jh->b_jcount++; 2420470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2421470decc6SDave Kleikamp if (new_jh) 2422470decc6SDave Kleikamp journal_free_journal_head(new_jh); 2423470decc6SDave Kleikamp return bh->b_private; 2424470decc6SDave Kleikamp } 2425470decc6SDave Kleikamp 2426470decc6SDave Kleikamp /* 2427470decc6SDave Kleikamp * Grab a ref against this buffer_head's journal_head. If it ended up not 2428470decc6SDave Kleikamp * having a journal_head, return NULL 2429470decc6SDave Kleikamp */ 2430f7f4bccbSMingming Cao struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) 2431470decc6SDave Kleikamp { 2432470decc6SDave Kleikamp struct journal_head *jh = NULL; 2433470decc6SDave Kleikamp 2434470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2435470decc6SDave Kleikamp if (buffer_jbd(bh)) { 2436470decc6SDave Kleikamp jh = bh2jh(bh); 2437470decc6SDave Kleikamp jh->b_jcount++; 2438470decc6SDave Kleikamp } 2439470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2440470decc6SDave Kleikamp return jh; 2441470decc6SDave Kleikamp } 2442470decc6SDave Kleikamp 2443470decc6SDave Kleikamp static void __journal_remove_journal_head(struct buffer_head *bh) 2444470decc6SDave Kleikamp { 2445470decc6SDave Kleikamp struct journal_head *jh = bh2jh(bh); 2446470decc6SDave Kleikamp 2447470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount >= 0); 2448de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_transaction == NULL); 2449de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_next_transaction == NULL); 2450de1b7941SJan Kara J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); 2451470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jlist == BJ_None); 2452470decc6SDave Kleikamp J_ASSERT_BH(bh, buffer_jbd(bh)); 2453470decc6SDave Kleikamp J_ASSERT_BH(bh, jh2bh(jh) == bh); 2454470decc6SDave Kleikamp BUFFER_TRACE(bh, "remove journal_head"); 2455470decc6SDave Kleikamp if (jh->b_frozen_data) { 2456de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_frozen_data\n", __func__); 2457af1e76d6SMingming Cao jbd2_free(jh->b_frozen_data, bh->b_size); 2458470decc6SDave Kleikamp } 2459470decc6SDave Kleikamp if (jh->b_committed_data) { 2460de1b7941SJan Kara printk(KERN_WARNING "%s: freeing b_committed_data\n", __func__); 2461af1e76d6SMingming Cao jbd2_free(jh->b_committed_data, bh->b_size); 2462470decc6SDave Kleikamp } 2463470decc6SDave Kleikamp bh->b_private = NULL; 2464470decc6SDave Kleikamp jh->b_bh = NULL; /* debug, really */ 2465470decc6SDave Kleikamp clear_buffer_jbd(bh); 2466470decc6SDave Kleikamp journal_free_journal_head(jh); 2467470decc6SDave Kleikamp } 2468470decc6SDave Kleikamp 2469470decc6SDave Kleikamp /* 2470de1b7941SJan Kara * Drop a reference on the passed journal_head. If it fell to zero then 2471470decc6SDave Kleikamp * release the journal_head from the buffer_head. 2472470decc6SDave Kleikamp */ 2473f7f4bccbSMingming Cao void jbd2_journal_put_journal_head(struct journal_head *jh) 2474470decc6SDave Kleikamp { 2475470decc6SDave Kleikamp struct buffer_head *bh = jh2bh(jh); 2476470decc6SDave Kleikamp 2477470decc6SDave Kleikamp jbd_lock_bh_journal_head(bh); 2478470decc6SDave Kleikamp J_ASSERT_JH(jh, jh->b_jcount > 0); 2479470decc6SDave Kleikamp --jh->b_jcount; 2480de1b7941SJan Kara if (!jh->b_jcount) { 2481470decc6SDave Kleikamp __journal_remove_journal_head(bh); 2482de1b7941SJan Kara jbd_unlock_bh_journal_head(bh); 2483470decc6SDave Kleikamp __brelse(bh); 2484de1b7941SJan Kara } else 2485470decc6SDave Kleikamp jbd_unlock_bh_journal_head(bh); 2486470decc6SDave Kleikamp } 2487470decc6SDave Kleikamp 2488470decc6SDave Kleikamp /* 2489c851ed54SJan Kara * Initialize jbd inode head 2490c851ed54SJan Kara */ 2491c851ed54SJan Kara void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) 2492c851ed54SJan Kara { 2493c851ed54SJan Kara jinode->i_transaction = NULL; 2494c851ed54SJan Kara jinode->i_next_transaction = NULL; 2495c851ed54SJan Kara jinode->i_vfs_inode = inode; 2496c851ed54SJan Kara jinode->i_flags = 0; 2497c851ed54SJan Kara INIT_LIST_HEAD(&jinode->i_list); 2498c851ed54SJan Kara } 2499c851ed54SJan Kara 2500c851ed54SJan Kara /* 2501c851ed54SJan Kara * Function to be called before we start removing inode from memory (i.e., 2502c851ed54SJan Kara * clear_inode() is a fine place to be called from). It removes inode from 2503c851ed54SJan Kara * transaction's lists. 2504c851ed54SJan Kara */ 2505c851ed54SJan Kara void jbd2_journal_release_jbd_inode(journal_t *journal, 2506c851ed54SJan Kara struct jbd2_inode *jinode) 2507c851ed54SJan Kara { 2508c851ed54SJan Kara if (!journal) 2509c851ed54SJan Kara return; 2510c851ed54SJan Kara restart: 2511c851ed54SJan Kara spin_lock(&journal->j_list_lock); 2512c851ed54SJan Kara /* Is commit writing out inode - we have to wait */ 251339e3ac25SBrian King if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) { 2514c851ed54SJan Kara wait_queue_head_t *wq; 2515c851ed54SJan Kara DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); 2516c851ed54SJan Kara wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); 2517c851ed54SJan Kara prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); 2518c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2519c851ed54SJan Kara schedule(); 2520c851ed54SJan Kara finish_wait(wq, &wait.wait); 2521c851ed54SJan Kara goto restart; 2522c851ed54SJan Kara } 2523c851ed54SJan Kara 2524c851ed54SJan Kara if (jinode->i_transaction) { 2525c851ed54SJan Kara list_del(&jinode->i_list); 2526c851ed54SJan Kara jinode->i_transaction = NULL; 2527c851ed54SJan Kara } 2528c851ed54SJan Kara spin_unlock(&journal->j_list_lock); 2529c851ed54SJan Kara } 2530c851ed54SJan Kara 2531470decc6SDave Kleikamp 25328e85fb3fSJohann Lombardi #ifdef CONFIG_PROC_FS 25338e85fb3fSJohann Lombardi 25348e85fb3fSJohann Lombardi #define JBD2_STATS_PROC_NAME "fs/jbd2" 25358e85fb3fSJohann Lombardi 25368e85fb3fSJohann Lombardi static void __init jbd2_create_jbd_stats_proc_entry(void) 25378e85fb3fSJohann Lombardi { 25388e85fb3fSJohann Lombardi proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); 25398e85fb3fSJohann Lombardi } 25408e85fb3fSJohann Lombardi 25418e85fb3fSJohann Lombardi static void __exit jbd2_remove_jbd_stats_proc_entry(void) 25428e85fb3fSJohann Lombardi { 25438e85fb3fSJohann Lombardi if (proc_jbd2_stats) 25448e85fb3fSJohann Lombardi remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); 25458e85fb3fSJohann Lombardi } 25468e85fb3fSJohann Lombardi 25478e85fb3fSJohann Lombardi #else 25488e85fb3fSJohann Lombardi 25498e85fb3fSJohann Lombardi #define jbd2_create_jbd_stats_proc_entry() do {} while (0) 25508e85fb3fSJohann Lombardi #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) 25518e85fb3fSJohann Lombardi 25528e85fb3fSJohann Lombardi #endif 25538e85fb3fSJohann Lombardi 25548aefcd55STheodore Ts'o struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; 2555470decc6SDave Kleikamp 25564185a2acSYongqiang Yang static int __init jbd2_journal_init_handle_cache(void) 2557470decc6SDave Kleikamp { 25588aefcd55STheodore Ts'o jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); 2559f7f4bccbSMingming Cao if (jbd2_handle_cache == NULL) { 25608aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create handle cache\n"); 25618aefcd55STheodore Ts'o return -ENOMEM; 25628aefcd55STheodore Ts'o } 25638aefcd55STheodore Ts'o jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); 25648aefcd55STheodore Ts'o if (jbd2_inode_cache == NULL) { 25658aefcd55STheodore Ts'o printk(KERN_EMERG "JBD2: failed to create inode cache\n"); 25668aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_handle_cache); 2567470decc6SDave Kleikamp return -ENOMEM; 2568470decc6SDave Kleikamp } 2569470decc6SDave Kleikamp return 0; 2570470decc6SDave Kleikamp } 2571470decc6SDave Kleikamp 2572f7f4bccbSMingming Cao static void jbd2_journal_destroy_handle_cache(void) 2573470decc6SDave Kleikamp { 2574f7f4bccbSMingming Cao if (jbd2_handle_cache) 2575f7f4bccbSMingming Cao kmem_cache_destroy(jbd2_handle_cache); 25768aefcd55STheodore Ts'o if (jbd2_inode_cache) 25778aefcd55STheodore Ts'o kmem_cache_destroy(jbd2_inode_cache); 25788aefcd55STheodore Ts'o 2579470decc6SDave Kleikamp } 2580470decc6SDave Kleikamp 2581470decc6SDave Kleikamp /* 2582470decc6SDave Kleikamp * Module startup and shutdown 2583470decc6SDave Kleikamp */ 2584470decc6SDave Kleikamp 2585470decc6SDave Kleikamp static int __init journal_init_caches(void) 2586470decc6SDave Kleikamp { 2587470decc6SDave Kleikamp int ret; 2588470decc6SDave Kleikamp 2589f7f4bccbSMingming Cao ret = jbd2_journal_init_revoke_caches(); 2590470decc6SDave Kleikamp if (ret == 0) 25914185a2acSYongqiang Yang ret = jbd2_journal_init_journal_head_cache(); 2592470decc6SDave Kleikamp if (ret == 0) 25934185a2acSYongqiang Yang ret = jbd2_journal_init_handle_cache(); 25940c2022ecSYongqiang Yang if (ret == 0) 25950c2022ecSYongqiang Yang ret = jbd2_journal_init_transaction_cache(); 2596470decc6SDave Kleikamp return ret; 2597470decc6SDave Kleikamp } 2598470decc6SDave Kleikamp 2599f7f4bccbSMingming Cao static void jbd2_journal_destroy_caches(void) 2600470decc6SDave Kleikamp { 2601f7f4bccbSMingming Cao jbd2_journal_destroy_revoke_caches(); 26024185a2acSYongqiang Yang jbd2_journal_destroy_journal_head_cache(); 2603f7f4bccbSMingming Cao jbd2_journal_destroy_handle_cache(); 26040c2022ecSYongqiang Yang jbd2_journal_destroy_transaction_cache(); 2605d2eecb03STheodore Ts'o jbd2_journal_destroy_slabs(); 2606470decc6SDave Kleikamp } 2607470decc6SDave Kleikamp 2608470decc6SDave Kleikamp static int __init journal_init(void) 2609470decc6SDave Kleikamp { 2610470decc6SDave Kleikamp int ret; 2611470decc6SDave Kleikamp 2612470decc6SDave Kleikamp BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); 2613470decc6SDave Kleikamp 2614470decc6SDave Kleikamp ret = journal_init_caches(); 2615620de4e1SDuane Griffin if (ret == 0) { 26168e85fb3fSJohann Lombardi jbd2_create_jbd_stats_proc_entry(); 2617620de4e1SDuane Griffin } else { 2618620de4e1SDuane Griffin jbd2_journal_destroy_caches(); 2619620de4e1SDuane Griffin } 2620470decc6SDave Kleikamp return ret; 2621470decc6SDave Kleikamp } 2622470decc6SDave Kleikamp 2623470decc6SDave Kleikamp static void __exit journal_exit(void) 2624470decc6SDave Kleikamp { 2625e23291b9SJose R. Santos #ifdef CONFIG_JBD2_DEBUG 2626470decc6SDave Kleikamp int n = atomic_read(&nr_journal_heads); 2627470decc6SDave Kleikamp if (n) 2628f2a44523SEryu Guan printk(KERN_EMERG "JBD2: leaked %d journal_heads!\n", n); 2629470decc6SDave Kleikamp #endif 26308e85fb3fSJohann Lombardi jbd2_remove_jbd_stats_proc_entry(); 2631f7f4bccbSMingming Cao jbd2_journal_destroy_caches(); 2632470decc6SDave Kleikamp } 2633470decc6SDave Kleikamp 2634470decc6SDave Kleikamp MODULE_LICENSE("GPL"); 2635470decc6SDave Kleikamp module_init(journal_init); 2636470decc6SDave Kleikamp module_exit(journal_exit); 2637470decc6SDave Kleikamp 2638