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fs/jbd2/journal.c
65.4 KB
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/* |
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* linux/fs/jbd2/journal.c |
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* * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 * * Copyright 1998 Red Hat corp --- All Rights Reserved * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your * option, any later version, incorporated herein by reference. * * Generic filesystem journal-writing code; part of the ext2fs * journaling system. * * This file manages journals: areas of disk reserved for logging * transactional updates. This includes the kernel journaling thread * which is responsible for scheduling updates to the log. * * We do not actually manage the physical storage of the journal in this * file: that is left to a per-journal policy function, which allows us * to store the journal within a filesystem-specified area for ext2 * journaling (ext2 can use a reserved inode for storing the log). */ #include <linux/module.h> #include <linux/time.h> #include <linux/fs.h> |
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#include <linux/jbd2.h> |
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#include <linux/errno.h> #include <linux/slab.h> |
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#include <linux/init.h> #include <linux/mm.h> |
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#include <linux/freezer.h> |
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#include <linux/pagemap.h> #include <linux/kthread.h> #include <linux/poison.h> #include <linux/proc_fs.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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#include <linux/math64.h> |
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#include <linux/hash.h> |
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#include <linux/log2.h> #include <linux/vmalloc.h> |
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#include <linux/backing-dev.h> |
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#include <linux/bitops.h> |
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#include <linux/ratelimit.h> |
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#define CREATE_TRACE_POINTS #include <trace/events/jbd2.h> |
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#include <asm/uaccess.h> #include <asm/page.h> |
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#include <asm/system.h> |
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|
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EXPORT_SYMBOL(jbd2_journal_extend); EXPORT_SYMBOL(jbd2_journal_stop); EXPORT_SYMBOL(jbd2_journal_lock_updates); EXPORT_SYMBOL(jbd2_journal_unlock_updates); EXPORT_SYMBOL(jbd2_journal_get_write_access); EXPORT_SYMBOL(jbd2_journal_get_create_access); EXPORT_SYMBOL(jbd2_journal_get_undo_access); |
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EXPORT_SYMBOL(jbd2_journal_set_triggers); |
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EXPORT_SYMBOL(jbd2_journal_dirty_metadata); EXPORT_SYMBOL(jbd2_journal_release_buffer); EXPORT_SYMBOL(jbd2_journal_forget); |
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#if 0 EXPORT_SYMBOL(journal_sync_buffer); #endif |
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EXPORT_SYMBOL(jbd2_journal_flush); EXPORT_SYMBOL(jbd2_journal_revoke); EXPORT_SYMBOL(jbd2_journal_init_dev); EXPORT_SYMBOL(jbd2_journal_init_inode); EXPORT_SYMBOL(jbd2_journal_update_format); EXPORT_SYMBOL(jbd2_journal_check_used_features); EXPORT_SYMBOL(jbd2_journal_check_available_features); EXPORT_SYMBOL(jbd2_journal_set_features); |
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EXPORT_SYMBOL(jbd2_journal_load); EXPORT_SYMBOL(jbd2_journal_destroy); |
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EXPORT_SYMBOL(jbd2_journal_abort); EXPORT_SYMBOL(jbd2_journal_errno); EXPORT_SYMBOL(jbd2_journal_ack_err); EXPORT_SYMBOL(jbd2_journal_clear_err); EXPORT_SYMBOL(jbd2_log_wait_commit); |
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EXPORT_SYMBOL(jbd2_log_start_commit); |
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EXPORT_SYMBOL(jbd2_journal_start_commit); EXPORT_SYMBOL(jbd2_journal_force_commit_nested); EXPORT_SYMBOL(jbd2_journal_wipe); EXPORT_SYMBOL(jbd2_journal_blocks_per_page); EXPORT_SYMBOL(jbd2_journal_invalidatepage); EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers); EXPORT_SYMBOL(jbd2_journal_force_commit); |
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EXPORT_SYMBOL(jbd2_journal_file_inode); EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); |
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EXPORT_SYMBOL(jbd2_inode_cache); |
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static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *); static void __journal_abort_soft (journal_t *journal, int errno); |
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static int jbd2_journal_create_slab(size_t slab_size); |
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/* * Helper function used to manage commit timeouts */ static void commit_timeout(unsigned long __data) { struct task_struct * p = (struct task_struct *) __data; wake_up_process(p); } /* |
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* kjournald2: The main thread function used to manage a logging device |
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* journal. * * This kernel thread is responsible for two things: * * 1) COMMIT: Every so often we need to commit the current state of the * filesystem to disk. The journal thread is responsible for writing * all of the metadata buffers to disk. * * 2) CHECKPOINT: We cannot reuse a used section of the log file until all * of the data in that part of the log has been rewritten elsewhere on * the disk. Flushing these old buffers to reclaim space in the log is * known as checkpointing, and this thread is responsible for that job. */ |
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static int kjournald2(void *arg) |
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{ journal_t *journal = arg; transaction_t *transaction; /* * Set up an interval timer which can be used to trigger a commit wakeup * after the commit interval expires */ setup_timer(&journal->j_commit_timer, commit_timeout, (unsigned long)current); /* Record that the journal thread is running */ journal->j_task = current; wake_up(&journal->j_wait_done_commit); |
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/* * And now, wait forever for commit wakeup events. */ |
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write_lock(&journal->j_state_lock); |
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loop: |
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if (journal->j_flags & JBD2_UNMOUNT) |
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goto end_loop; jbd_debug(1, "commit_sequence=%d, commit_request=%d ", journal->j_commit_sequence, journal->j_commit_request); if (journal->j_commit_sequence != journal->j_commit_request) { jbd_debug(1, "OK, requests differ "); |
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write_unlock(&journal->j_state_lock); |
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del_timer_sync(&journal->j_commit_timer); |
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jbd2_journal_commit_transaction(journal); |
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write_lock(&journal->j_state_lock); |
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goto loop; } wake_up(&journal->j_wait_done_commit); if (freezing(current)) { /* * The simpler the better. Flushing journal isn't a * good idea, because that depends on threads that may * be already stopped. */ |
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jbd_debug(1, "Now suspending kjournald2 "); |
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write_unlock(&journal->j_state_lock); |
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try_to_freeze(); |
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write_lock(&journal->j_state_lock); |
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} else { /* * We assume on resume that commits are already there, * so we don't sleep */ DEFINE_WAIT(wait); int should_sleep = 1; prepare_to_wait(&journal->j_wait_commit, &wait, TASK_INTERRUPTIBLE); if (journal->j_commit_sequence != journal->j_commit_request) should_sleep = 0; transaction = journal->j_running_transaction; if (transaction && time_after_eq(jiffies, transaction->t_expires)) should_sleep = 0; |
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if (journal->j_flags & JBD2_UNMOUNT) |
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should_sleep = 0; if (should_sleep) { |
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write_unlock(&journal->j_state_lock); |
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schedule(); |
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write_lock(&journal->j_state_lock); |
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} finish_wait(&journal->j_wait_commit, &wait); } |
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jbd_debug(1, "kjournald2 wakes "); |
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/* * Were we woken up by a commit wakeup event? */ transaction = journal->j_running_transaction; if (transaction && time_after_eq(jiffies, transaction->t_expires)) { journal->j_commit_request = transaction->t_tid; jbd_debug(1, "woke because of timeout "); } goto loop; end_loop: |
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write_unlock(&journal->j_state_lock); |
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del_timer_sync(&journal->j_commit_timer); journal->j_task = NULL; wake_up(&journal->j_wait_done_commit); jbd_debug(1, "Journal thread exiting. "); return 0; } |
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static int jbd2_journal_start_thread(journal_t *journal) |
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{ |
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struct task_struct *t; |
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t = kthread_run(kjournald2, journal, "jbd2/%s", journal->j_devname); |
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if (IS_ERR(t)) return PTR_ERR(t); |
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wait_event(journal->j_wait_done_commit, journal->j_task != NULL); |
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return 0; |
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} static void journal_kill_thread(journal_t *journal) { |
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write_lock(&journal->j_state_lock); |
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journal->j_flags |= JBD2_UNMOUNT; |
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while (journal->j_task) { wake_up(&journal->j_wait_commit); |
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write_unlock(&journal->j_state_lock); |
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wait_event(journal->j_wait_done_commit, journal->j_task == NULL); |
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write_lock(&journal->j_state_lock); |
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} |
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write_unlock(&journal->j_state_lock); |
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} /* |
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* jbd2_journal_write_metadata_buffer: write a metadata buffer to the journal. |
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* * Writes a metadata buffer to a given disk block. The actual IO is not * performed but a new buffer_head is constructed which labels the data * to be written with the correct destination disk block. * * Any magic-number escaping which needs to be done will cause a * copy-out here. If the buffer happens to start with the |
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* JBD2_MAGIC_NUMBER, then we can't write it to the log directly: the |
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* magic number is only written to the log for descripter blocks. In * this case, we copy the data and replace the first word with 0, and we * return a result code which indicates that this buffer needs to be * marked as an escaped buffer in the corresponding log descriptor * block. The missing word can then be restored when the block is read * during recovery. * * If the source buffer has already been modified by a new transaction * since we took the last commit snapshot, we use the frozen copy of * that data for IO. If we end up using the existing buffer_head's data * for the write, then we *have* to lock the buffer to prevent anyone * else from using and possibly modifying it while the IO is in * progress. * * The function returns a pointer to the buffer_heads to be used for IO. * * We assume that the journal has already been locked in this function. * * Return value: * <0: Error * >=0: Finished OK * * On success: * Bit 0 set == escape performed on the data * Bit 1 set == buffer copy-out performed (kfree the data after IO) */ |
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int jbd2_journal_write_metadata_buffer(transaction_t *transaction, |
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struct journal_head *jh_in, struct journal_head **jh_out, |
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unsigned long long blocknr) |
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{ int need_copy_out = 0; int done_copy_out = 0; int do_escape = 0; char *mapped_data; struct buffer_head *new_bh; struct journal_head *new_jh; struct page *new_page; unsigned int new_offset; struct buffer_head *bh_in = jh2bh(jh_in); |
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journal_t *journal = transaction->t_journal; |
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/* * The buffer really shouldn't be locked: only the current committing * transaction is allowed to write it, so nobody else is allowed * to do any IO. * * akpm: except if we're journalling data, and write() output is * also part of a shared mapping, and another thread has * decided to launch a writepage() against this buffer. */ J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in)); |
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retry_alloc: new_bh = alloc_buffer_head(GFP_NOFS); if (!new_bh) { /* * Failure is not an option, but __GFP_NOFAIL is going * away; so we retry ourselves here. */ congestion_wait(BLK_RW_ASYNC, HZ/50); goto retry_alloc; } |
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/* keep subsequent assertions sane */ new_bh->b_state = 0; init_buffer(new_bh, NULL, NULL); atomic_set(&new_bh->b_count, 1); new_jh = jbd2_journal_add_journal_head(new_bh); /* This sleeps */ |
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/* * If a new transaction has already done a buffer copy-out, then * we use that version of the data for the commit. */ jbd_lock_bh_state(bh_in); repeat: if (jh_in->b_frozen_data) { done_copy_out = 1; new_page = virt_to_page(jh_in->b_frozen_data); new_offset = offset_in_page(jh_in->b_frozen_data); } else { new_page = jh2bh(jh_in)->b_page; new_offset = offset_in_page(jh2bh(jh_in)->b_data); } mapped_data = kmap_atomic(new_page, KM_USER0); /* |
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* Fire data frozen trigger if data already wasn't frozen. Do this * before checking for escaping, as the trigger may modify the magic * offset. If a copy-out happens afterwards, it will have the correct * data in the buffer. |
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*/ |
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if (!done_copy_out) jbd2_buffer_frozen_trigger(jh_in, mapped_data + new_offset, jh_in->b_triggers); |
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/* |
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* Check for escaping */ if (*((__be32 *)(mapped_data + new_offset)) == |
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cpu_to_be32(JBD2_MAGIC_NUMBER)) { |
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need_copy_out = 1; do_escape = 1; } kunmap_atomic(mapped_data, KM_USER0); /* * Do we need to do a data copy? */ if (need_copy_out && !done_copy_out) { char *tmp; jbd_unlock_bh_state(bh_in); |
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tmp = jbd2_alloc(bh_in->b_size, GFP_NOFS); |
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if (!tmp) { jbd2_journal_put_journal_head(new_jh); return -ENOMEM; } |
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jbd_lock_bh_state(bh_in); if (jh_in->b_frozen_data) { |
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jbd2_free(tmp, bh_in->b_size); |
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goto repeat; } jh_in->b_frozen_data = tmp; mapped_data = kmap_atomic(new_page, KM_USER0); memcpy(tmp, mapped_data + new_offset, jh2bh(jh_in)->b_size); kunmap_atomic(mapped_data, KM_USER0); new_page = virt_to_page(tmp); new_offset = offset_in_page(tmp); done_copy_out = 1; |
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/* * This isn't strictly necessary, as we're using frozen * data for the escaping, but it keeps consistency with * b_frozen_data usage. */ jh_in->b_frozen_triggers = jh_in->b_triggers; |
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} /* * Did we need to do an escaping? Now we've done all the * copying, we can finally do so. */ if (do_escape) { mapped_data = kmap_atomic(new_page, KM_USER0); *((unsigned int *)(mapped_data + new_offset)) = 0; kunmap_atomic(mapped_data, KM_USER0); } |
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set_bh_page(new_bh, new_page, new_offset); new_jh->b_transaction = NULL; new_bh->b_size = jh2bh(jh_in)->b_size; new_bh->b_bdev = transaction->t_journal->j_dev; new_bh->b_blocknr = blocknr; set_buffer_mapped(new_bh); set_buffer_dirty(new_bh); *jh_out = new_jh; /* * The to-be-written buffer needs to get moved to the io queue, * and the original buffer whose contents we are shadowing or * copying is moved to the transaction's shadow queue. */ JBUFFER_TRACE(jh_in, "file as BJ_Shadow"); |
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spin_lock(&journal->j_list_lock); __jbd2_journal_file_buffer(jh_in, transaction, BJ_Shadow); spin_unlock(&journal->j_list_lock); jbd_unlock_bh_state(bh_in); |
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JBUFFER_TRACE(new_jh, "file as BJ_IO"); |
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jbd2_journal_file_buffer(new_jh, transaction, BJ_IO); |
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return do_escape | (done_copy_out << 1); } /* * Allocation code for the journal file. Manage the space left in the * journal, so that we can begin checkpointing when appropriate. */ /* |
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* __jbd2_log_space_left: Return the number of free blocks left in the journal. |
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* * Called with the journal already locked. * * Called under j_state_lock */ |
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int __jbd2_log_space_left(journal_t *journal) |
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{ int left = journal->j_free; |
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/* assert_spin_locked(&journal->j_state_lock); */ |
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/* * Be pessimistic here about the number of those free blocks which * might be required for log descriptor control blocks. */ #define MIN_LOG_RESERVED_BLOCKS 32 /* Allow for rounding errors */ left -= MIN_LOG_RESERVED_BLOCKS; if (left <= 0) return 0; left -= (left >> 3); return left; } /* |
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* Called with j_state_lock locked for writing. * Returns true if a transaction commit was started. |
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*/ |
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int __jbd2_log_start_commit(journal_t *journal, tid_t target) |
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{ /* |
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* The only transaction we can possibly wait upon is the * currently running transaction (if it exists). Otherwise, * the target tid must be an old one. |
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*/ |
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if (journal->j_running_transaction && journal->j_running_transaction->t_tid == target) { |
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/* |
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* We want a new commit: OK, mark the request and wakeup the |
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* commit thread. We do _not_ do the commit ourselves. */ journal->j_commit_request = target; |
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jbd_debug(1, "JBD2: requesting commit %d/%d ", |
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journal->j_commit_request, journal->j_commit_sequence); wake_up(&journal->j_wait_commit); return 1; |
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} else if (!tid_geq(journal->j_commit_request, target)) /* This should never happen, but if it does, preserve the evidence before kjournald goes into a loop and increments j_commit_sequence beyond all recognition. */ |
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WARN_ONCE(1, "JBD2: bad log_start_commit: %u %u %u %u ", |
1be2add68 jbd2: only print ... |
499 500 501 502 |
journal->j_commit_request, journal->j_commit_sequence, target, journal->j_running_transaction ? journal->j_running_transaction->t_tid : 0); |
470decc61 [PATCH] jbd2: ini... |
503 504 |
return 0; } |
f7f4bccb7 [PATCH] jbd2: ren... |
505 |
int jbd2_log_start_commit(journal_t *journal, tid_t tid) |
470decc61 [PATCH] jbd2: ini... |
506 507 |
{ int ret; |
a931da6ac jbd2: Change j_st... |
508 |
write_lock(&journal->j_state_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
509 |
ret = __jbd2_log_start_commit(journal, tid); |
a931da6ac jbd2: Change j_st... |
510 |
write_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
511 512 513 514 515 516 517 518 519 520 521 522 523 |
return ret; } /* * Force and wait upon a commit if the calling process is not within * transaction. This is used for forcing out undo-protected data which contains * bitmaps, when the fs is running out of space. * * We can only force the running transaction if we don't have an active handle; * otherwise, we will deadlock. * * Returns true if a transaction was started. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
524 |
int jbd2_journal_force_commit_nested(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
525 526 527 |
{ transaction_t *transaction = NULL; tid_t tid; |
e44718318 jbd2: call __jbd2... |
528 |
int need_to_start = 0; |
470decc61 [PATCH] jbd2: ini... |
529 |
|
a931da6ac jbd2: Change j_st... |
530 |
read_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
531 532 |
if (journal->j_running_transaction && !current->journal_info) { transaction = journal->j_running_transaction; |
e44718318 jbd2: call __jbd2... |
533 534 |
if (!tid_geq(journal->j_commit_request, transaction->t_tid)) need_to_start = 1; |
470decc61 [PATCH] jbd2: ini... |
535 536 537 538 |
} else if (journal->j_committing_transaction) transaction = journal->j_committing_transaction; if (!transaction) { |
a931da6ac jbd2: Change j_st... |
539 |
read_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
540 541 542 543 |
return 0; /* Nothing to retry */ } tid = transaction->t_tid; |
a931da6ac jbd2: Change j_st... |
544 |
read_unlock(&journal->j_state_lock); |
e44718318 jbd2: call __jbd2... |
545 546 |
if (need_to_start) jbd2_log_start_commit(journal, tid); |
f7f4bccb7 [PATCH] jbd2: ren... |
547 |
jbd2_log_wait_commit(journal, tid); |
470decc61 [PATCH] jbd2: ini... |
548 549 550 551 552 |
return 1; } /* * Start a commit of the current running transaction (if any). Returns true |
c88ccea31 jbd2: Fix return ... |
553 554 |
* if a transaction is going to be committed (or is currently already * committing), and fills its tid in at *ptid |
470decc61 [PATCH] jbd2: ini... |
555 |
*/ |
f7f4bccb7 [PATCH] jbd2: ren... |
556 |
int jbd2_journal_start_commit(journal_t *journal, tid_t *ptid) |
470decc61 [PATCH] jbd2: ini... |
557 558 |
{ int ret = 0; |
a931da6ac jbd2: Change j_st... |
559 |
write_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
560 561 |
if (journal->j_running_transaction) { tid_t tid = journal->j_running_transaction->t_tid; |
c88ccea31 jbd2: Fix return ... |
562 563 564 565 |
__jbd2_log_start_commit(journal, tid); /* There's a running transaction and we've just made sure * it's commit has been scheduled. */ if (ptid) |
470decc61 [PATCH] jbd2: ini... |
566 |
*ptid = tid; |
c88ccea31 jbd2: Fix return ... |
567 568 |
ret = 1; } else if (journal->j_committing_transaction) { |
470decc61 [PATCH] jbd2: ini... |
569 570 571 572 |
/* * If ext3_write_super() recently started a commit, then we * have to wait for completion of that transaction */ |
c88ccea31 jbd2: Fix return ... |
573 574 |
if (ptid) *ptid = journal->j_committing_transaction->t_tid; |
470decc61 [PATCH] jbd2: ini... |
575 576 |
ret = 1; } |
a931da6ac jbd2: Change j_st... |
577 |
write_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
578 579 580 581 |
return ret; } /* |
bbd2be369 jbd2: Add functio... |
582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 |
* Return 1 if a given transaction has not yet sent barrier request * connected with a transaction commit. If 0 is returned, transaction * may or may not have sent the barrier. Used to avoid sending barrier * twice in common cases. */ int jbd2_trans_will_send_data_barrier(journal_t *journal, tid_t tid) { int ret = 0; transaction_t *commit_trans; if (!(journal->j_flags & JBD2_BARRIER)) return 0; read_lock(&journal->j_state_lock); /* Transaction already committed? */ if (tid_geq(journal->j_commit_sequence, tid)) goto out; commit_trans = journal->j_committing_transaction; if (!commit_trans || commit_trans->t_tid != tid) { ret = 1; goto out; } /* * Transaction is being committed and we already proceeded to * submitting a flush to fs partition? */ if (journal->j_fs_dev != journal->j_dev) { if (!commit_trans->t_need_data_flush || commit_trans->t_state >= T_COMMIT_DFLUSH) goto out; } else { if (commit_trans->t_state >= T_COMMIT_JFLUSH) goto out; } ret = 1; out: read_unlock(&journal->j_state_lock); return ret; } EXPORT_SYMBOL(jbd2_trans_will_send_data_barrier); /* |
470decc61 [PATCH] jbd2: ini... |
623 624 625 |
* Wait for a specified commit to complete. * The caller may not hold the journal lock. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
626 |
int jbd2_log_wait_commit(journal_t *journal, tid_t tid) |
470decc61 [PATCH] jbd2: ini... |
627 628 |
{ int err = 0; |
a931da6ac jbd2: Change j_st... |
629 |
read_lock(&journal->j_state_lock); |
e23291b91 jbd2: Fix CONFIG_... |
630 |
#ifdef CONFIG_JBD2_DEBUG |
470decc61 [PATCH] jbd2: ini... |
631 632 633 634 |
if (!tid_geq(journal->j_commit_request, tid)) { printk(KERN_EMERG "%s: error: j_commit_request=%d, tid=%d ", |
329d291f5 jdb2: replace rem... |
635 |
__func__, journal->j_commit_request, tid); |
470decc61 [PATCH] jbd2: ini... |
636 |
} |
470decc61 [PATCH] jbd2: ini... |
637 |
#endif |
470decc61 [PATCH] jbd2: ini... |
638 |
while (tid_gt(tid, journal->j_commit_sequence)) { |
f2a44523b jbd2: Unify log m... |
639 640 |
jbd_debug(1, "JBD2: want %d, j_commit_sequence=%d ", |
470decc61 [PATCH] jbd2: ini... |
641 642 |
tid, journal->j_commit_sequence); wake_up(&journal->j_wait_commit); |
a931da6ac jbd2: Change j_st... |
643 |
read_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
644 645 |
wait_event(journal->j_wait_done_commit, !tid_gt(tid, journal->j_commit_sequence)); |
a931da6ac jbd2: Change j_st... |
646 |
read_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
647 |
} |
a931da6ac jbd2: Change j_st... |
648 |
read_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
649 650 651 652 653 654 655 656 657 658 659 660 |
if (unlikely(is_journal_aborted(journal))) { printk(KERN_EMERG "journal commit I/O error "); err = -EIO; } return err; } /* * Log buffer allocation routines: */ |
18eba7aae [PATCH] jbd2: swi... |
661 |
int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) |
470decc61 [PATCH] jbd2: ini... |
662 663 |
{ unsigned long blocknr; |
a931da6ac jbd2: Change j_st... |
664 |
write_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
665 666 667 668 669 670 671 |
J_ASSERT(journal->j_free > 1); blocknr = journal->j_head; journal->j_head++; journal->j_free--; if (journal->j_head == journal->j_last) journal->j_head = journal->j_first; |
a931da6ac jbd2: Change j_st... |
672 |
write_unlock(&journal->j_state_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
673 |
return jbd2_journal_bmap(journal, blocknr, retp); |
470decc61 [PATCH] jbd2: ini... |
674 675 676 677 678 679 680 681 682 |
} /* * Conversion of logical to physical block numbers for the journal * * On external journals the journal blocks are identity-mapped, so * this is a no-op. If needed, we can use j_blk_offset - everything is * ready. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
683 |
int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr, |
18eba7aae [PATCH] jbd2: swi... |
684 |
unsigned long long *retp) |
470decc61 [PATCH] jbd2: ini... |
685 686 |
{ int err = 0; |
18eba7aae [PATCH] jbd2: swi... |
687 |
unsigned long long ret; |
470decc61 [PATCH] jbd2: ini... |
688 689 690 691 692 693 |
if (journal->j_inode) { ret = bmap(journal->j_inode, blocknr); if (ret) *retp = ret; else { |
470decc61 [PATCH] jbd2: ini... |
694 695 696 |
printk(KERN_ALERT "%s: journal block not found " "at offset %lu on %s ", |
05496769e jbd2: clean up ho... |
697 |
__func__, blocknr, journal->j_devname); |
470decc61 [PATCH] jbd2: ini... |
698 699 700 701 702 703 704 705 706 707 708 709 710 711 |
err = -EIO; __journal_abort_soft(journal, err); } } else { *retp = blocknr; /* +journal->j_blk_offset */ } return err; } /* * We play buffer_head aliasing tricks to write data/metadata blocks to * the journal without copying their contents, but for journal * descriptor blocks we do need to generate bona fide buffers. * |
f7f4bccb7 [PATCH] jbd2: ren... |
712 |
* After the caller of jbd2_journal_get_descriptor_buffer() has finished modifying |
470decc61 [PATCH] jbd2: ini... |
713 714 715 716 |
* the buffer's contents they really should run flush_dcache_page(bh->b_page). * But we don't bother doing that, so there will be coherency problems with * mmaps of blockdevs which hold live JBD-controlled filesystems. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
717 |
struct journal_head *jbd2_journal_get_descriptor_buffer(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
718 719 |
{ struct buffer_head *bh; |
18eba7aae [PATCH] jbd2: swi... |
720 |
unsigned long long blocknr; |
470decc61 [PATCH] jbd2: ini... |
721 |
int err; |
f7f4bccb7 [PATCH] jbd2: ren... |
722 |
err = jbd2_journal_next_log_block(journal, &blocknr); |
470decc61 [PATCH] jbd2: ini... |
723 724 725 726 727 |
if (err) return NULL; bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); |
4b905671d jbd2: Fix oops in... |
728 729 |
if (!bh) return NULL; |
470decc61 [PATCH] jbd2: ini... |
730 731 732 733 734 |
lock_buffer(bh); memset(bh->b_data, 0, journal->j_blocksize); set_buffer_uptodate(bh); unlock_buffer(bh); BUFFER_TRACE(bh, "return this buffer"); |
f7f4bccb7 [PATCH] jbd2: ren... |
735 |
return jbd2_journal_add_journal_head(bh); |
470decc61 [PATCH] jbd2: ini... |
736 |
} |
8e85fb3f3 jbd2: jbd2 stats ... |
737 738 739 740 741 742 |
struct jbd2_stats_proc_session { journal_t *journal; struct transaction_stats_s *stats; int start; int max; }; |
8e85fb3f3 jbd2: jbd2 stats ... |
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 |
static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos) { return *pos ? NULL : SEQ_START_TOKEN; } static void *jbd2_seq_info_next(struct seq_file *seq, void *v, loff_t *pos) { return NULL; } static int jbd2_seq_info_show(struct seq_file *seq, void *v) { struct jbd2_stats_proc_session *s = seq->private; if (v != SEQ_START_TOKEN) return 0; |
bf6993276 jbd2: Use tracepo... |
759 760 |
seq_printf(seq, "%lu transaction, each up to %u blocks ", |
8e85fb3f3 jbd2: jbd2 stats ... |
761 762 763 764 765 766 767 |
s->stats->ts_tid, s->journal->j_max_transaction_buffers); if (s->stats->ts_tid == 0) return 0; seq_printf(seq, "average: %ums waiting for transaction ", |
bf6993276 jbd2: Use tracepo... |
768 |
jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid)); |
8e85fb3f3 jbd2: jbd2 stats ... |
769 770 |
seq_printf(seq, " %ums running transaction ", |
bf6993276 jbd2: Use tracepo... |
771 |
jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid)); |
8e85fb3f3 jbd2: jbd2 stats ... |
772 773 |
seq_printf(seq, " %ums transaction was being locked ", |
bf6993276 jbd2: Use tracepo... |
774 |
jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid)); |
8e85fb3f3 jbd2: jbd2 stats ... |
775 776 |
seq_printf(seq, " %ums flushing data (in ordered mode) ", |
bf6993276 jbd2: Use tracepo... |
777 |
jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid)); |
8e85fb3f3 jbd2: jbd2 stats ... |
778 779 |
seq_printf(seq, " %ums logging transaction ", |
bf6993276 jbd2: Use tracepo... |
780 |
jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid)); |
c225aa57f ext4: fix wrong u... |
781 782 783 |
seq_printf(seq, " %lluus average transaction commit time ", div_u64(s->journal->j_average_commit_time, 1000)); |
8e85fb3f3 jbd2: jbd2 stats ... |
784 785 |
seq_printf(seq, " %lu handles per transaction ", |
bf6993276 jbd2: Use tracepo... |
786 |
s->stats->run.rs_handle_count / s->stats->ts_tid); |
8e85fb3f3 jbd2: jbd2 stats ... |
787 788 |
seq_printf(seq, " %lu blocks per transaction ", |
bf6993276 jbd2: Use tracepo... |
789 |
s->stats->run.rs_blocks / s->stats->ts_tid); |
8e85fb3f3 jbd2: jbd2 stats ... |
790 791 |
seq_printf(seq, " %lu logged blocks per transaction ", |
bf6993276 jbd2: Use tracepo... |
792 |
s->stats->run.rs_blocks_logged / s->stats->ts_tid); |
8e85fb3f3 jbd2: jbd2 stats ... |
793 794 795 796 797 798 |
return 0; } static void jbd2_seq_info_stop(struct seq_file *seq, void *v) { } |
88e9d34c7 seq_file: constif... |
799 |
static const struct seq_operations jbd2_seq_info_ops = { |
8e85fb3f3 jbd2: jbd2 stats ... |
800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 |
.start = jbd2_seq_info_start, .next = jbd2_seq_info_next, .stop = jbd2_seq_info_stop, .show = jbd2_seq_info_show, }; static int jbd2_seq_info_open(struct inode *inode, struct file *file) { journal_t *journal = PDE(inode)->data; struct jbd2_stats_proc_session *s; int rc, size; s = kmalloc(sizeof(*s), GFP_KERNEL); if (s == NULL) return -ENOMEM; size = sizeof(struct transaction_stats_s); s->stats = kmalloc(size, GFP_KERNEL); if (s->stats == NULL) { kfree(s); return -ENOMEM; } spin_lock(&journal->j_history_lock); memcpy(s->stats, &journal->j_stats, size); s->journal = journal; spin_unlock(&journal->j_history_lock); rc = seq_open(file, &jbd2_seq_info_ops); if (rc == 0) { struct seq_file *m = file->private_data; m->private = s; } else { kfree(s->stats); kfree(s); } return rc; } static int jbd2_seq_info_release(struct inode *inode, struct file *file) { struct seq_file *seq = file->private_data; struct jbd2_stats_proc_session *s = seq->private; kfree(s->stats); kfree(s); return seq_release(inode, file); } |
828c09509 const: constify r... |
846 |
static const struct file_operations jbd2_seq_info_fops = { |
8e85fb3f3 jbd2: jbd2 stats ... |
847 848 849 850 851 852 853 854 855 856 857 |
.owner = THIS_MODULE, .open = jbd2_seq_info_open, .read = seq_read, .llseek = seq_lseek, .release = jbd2_seq_info_release, }; static struct proc_dir_entry *proc_jbd2_stats; static void jbd2_stats_proc_init(journal_t *journal) { |
05496769e jbd2: clean up ho... |
858 |
journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats); |
8e85fb3f3 jbd2: jbd2 stats ... |
859 |
if (journal->j_proc_entry) { |
79da3664f jbd2: use non-rac... |
860 861 |
proc_create_data("info", S_IRUGO, journal->j_proc_entry, &jbd2_seq_info_fops, journal); |
8e85fb3f3 jbd2: jbd2 stats ... |
862 863 864 865 866 |
} } static void jbd2_stats_proc_exit(journal_t *journal) { |
8e85fb3f3 jbd2: jbd2 stats ... |
867 |
remove_proc_entry("info", journal->j_proc_entry); |
05496769e jbd2: clean up ho... |
868 |
remove_proc_entry(journal->j_devname, proc_jbd2_stats); |
8e85fb3f3 jbd2: jbd2 stats ... |
869 |
} |
470decc61 [PATCH] jbd2: ini... |
870 871 872 873 874 875 876 877 878 879 880 881 882 |
/* * Management for journal control blocks: functions to create and * destroy journal_t structures, and to initialise and read existing * journal blocks from disk. */ /* First: create and setup a journal_t object in memory. We initialise * very few fields yet: that has to wait until we have created the * journal structures from from scratch, or loaded them from disk. */ static journal_t * journal_init_common (void) { journal_t *journal; int err; |
3ebfdf885 jbd2: don't use _... |
883 |
journal = kzalloc(sizeof(*journal), GFP_KERNEL); |
470decc61 [PATCH] jbd2: ini... |
884 |
if (!journal) |
b7271b0a3 jbd2: simplify re... |
885 |
return NULL; |
470decc61 [PATCH] jbd2: ini... |
886 887 888 889 890 891 892 893 894 895 896 |
init_waitqueue_head(&journal->j_wait_transaction_locked); init_waitqueue_head(&journal->j_wait_logspace); init_waitqueue_head(&journal->j_wait_done_commit); init_waitqueue_head(&journal->j_wait_checkpoint); init_waitqueue_head(&journal->j_wait_commit); init_waitqueue_head(&journal->j_wait_updates); mutex_init(&journal->j_barrier); mutex_init(&journal->j_checkpoint_mutex); spin_lock_init(&journal->j_revoke_lock); spin_lock_init(&journal->j_list_lock); |
a931da6ac jbd2: Change j_st... |
897 |
rwlock_init(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
898 |
|
cd02ff0b1 jbd2: JBD_XXX to ... |
899 |
journal->j_commit_interval = (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE); |
30773840c ext4: add fsync b... |
900 901 |
journal->j_min_batch_time = 0; journal->j_max_batch_time = 15000; /* 15ms */ |
470decc61 [PATCH] jbd2: ini... |
902 903 |
/* The journal is marked for error until we succeed with recovery! */ |
f7f4bccb7 [PATCH] jbd2: ren... |
904 |
journal->j_flags = JBD2_ABORT; |
470decc61 [PATCH] jbd2: ini... |
905 906 |
/* Set up a default-sized revoke table for the new mount. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
907 |
err = jbd2_journal_init_revoke(journal, JOURNAL_REVOKE_DEFAULT_HASH); |
470decc61 [PATCH] jbd2: ini... |
908 909 |
if (err) { kfree(journal); |
b7271b0a3 jbd2: simplify re... |
910 |
return NULL; |
470decc61 [PATCH] jbd2: ini... |
911 |
} |
8e85fb3f3 jbd2: jbd2 stats ... |
912 |
|
bf6993276 jbd2: Use tracepo... |
913 |
spin_lock_init(&journal->j_history_lock); |
8e85fb3f3 jbd2: jbd2 stats ... |
914 |
|
470decc61 [PATCH] jbd2: ini... |
915 |
return journal; |
470decc61 [PATCH] jbd2: ini... |
916 |
} |
f7f4bccb7 [PATCH] jbd2: ren... |
917 |
/* jbd2_journal_init_dev and jbd2_journal_init_inode: |
470decc61 [PATCH] jbd2: ini... |
918 919 920 921 922 923 924 925 926 |
* * Create a journal structure assigned some fixed set of disk blocks to * the journal. We don't actually touch those disk blocks yet, but we * need to set up all of the mapping information to tell the journaling * system where the journal blocks are. * */ /** |
5648ba5b2 jbd2: fix kernel-... |
927 |
* journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure |
470decc61 [PATCH] jbd2: ini... |
928 929 930 931 932 |
* @bdev: Block device on which to create the journal * @fs_dev: Device which hold journalled filesystem for this journal. * @start: Block nr Start of journal. * @len: Length of the journal in blocks. * @blocksize: blocksize of journalling device |
5648ba5b2 jbd2: fix kernel-... |
933 934 |
* * Returns: a newly created journal_t * |
470decc61 [PATCH] jbd2: ini... |
935 |
* |
f7f4bccb7 [PATCH] jbd2: ren... |
936 |
* jbd2_journal_init_dev creates a journal which maps a fixed contiguous |
470decc61 [PATCH] jbd2: ini... |
937 938 939 |
* range of blocks on an arbitrary block device. * */ |
f7f4bccb7 [PATCH] jbd2: ren... |
940 |
journal_t * jbd2_journal_init_dev(struct block_device *bdev, |
470decc61 [PATCH] jbd2: ini... |
941 |
struct block_device *fs_dev, |
18eba7aae [PATCH] jbd2: swi... |
942 |
unsigned long long start, int len, int blocksize) |
470decc61 [PATCH] jbd2: ini... |
943 944 945 |
{ journal_t *journal = journal_init_common(); struct buffer_head *bh; |
05496769e jbd2: clean up ho... |
946 |
char *p; |
470decc61 [PATCH] jbd2: ini... |
947 948 949 950 951 952 953 |
int n; if (!journal) return NULL; /* journal descriptor can store up to n blocks -bzzz */ journal->j_blocksize = blocksize; |
0587aa3d1 jbd2: fix /proc/f... |
954 955 956 957 958 959 960 961 |
journal->j_dev = bdev; journal->j_fs_dev = fs_dev; journal->j_blk_offset = start; journal->j_maxlen = len; bdevname(journal->j_dev, journal->j_devname); p = journal->j_devname; while ((p = strchr(p, '/'))) *p = '!'; |
4b905671d jbd2: Fix oops in... |
962 |
jbd2_stats_proc_init(journal); |
470decc61 [PATCH] jbd2: ini... |
963 964 965 966 |
n = journal->j_blocksize / sizeof(journal_block_tag_t); journal->j_wbufsize = n; journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); if (!journal->j_wbuf) { |
25985edce Fix common misspe... |
967 968 |
printk(KERN_ERR "%s: Can't allocate bhs for commit thread ", |
329d291f5 jdb2: replace rem... |
969 |
__func__); |
4b905671d jbd2: Fix oops in... |
970 |
goto out_err; |
470decc61 [PATCH] jbd2: ini... |
971 |
} |
470decc61 [PATCH] jbd2: ini... |
972 973 |
bh = __getblk(journal->j_dev, start, journal->j_blocksize); |
4b905671d jbd2: Fix oops in... |
974 975 976 977 978 979 980 |
if (!bh) { printk(KERN_ERR "%s: Cannot get buffer for journal superblock ", __func__); goto out_err; } |
470decc61 [PATCH] jbd2: ini... |
981 982 |
journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; |
4b905671d jbd2: Fix oops in... |
983 |
|
470decc61 [PATCH] jbd2: ini... |
984 |
return journal; |
4b905671d jbd2: Fix oops in... |
985 |
out_err: |
7b02bec07 JBD/JBD2: free j_... |
986 |
kfree(journal->j_wbuf); |
4b905671d jbd2: Fix oops in... |
987 988 989 |
jbd2_stats_proc_exit(journal); kfree(journal); return NULL; |
470decc61 [PATCH] jbd2: ini... |
990 991 992 |
} /** |
f7f4bccb7 [PATCH] jbd2: ren... |
993 |
* journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode. |
470decc61 [PATCH] jbd2: ini... |
994 995 |
* @inode: An inode to create the journal in * |
f7f4bccb7 [PATCH] jbd2: ren... |
996 |
* jbd2_journal_init_inode creates a journal which maps an on-disk inode as |
470decc61 [PATCH] jbd2: ini... |
997 998 999 |
* the journal. The inode must exist already, must support bmap() and * must have all data blocks preallocated. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1000 |
journal_t * jbd2_journal_init_inode (struct inode *inode) |
470decc61 [PATCH] jbd2: ini... |
1001 1002 1003 |
{ struct buffer_head *bh; journal_t *journal = journal_init_common(); |
05496769e jbd2: clean up ho... |
1004 |
char *p; |
470decc61 [PATCH] jbd2: ini... |
1005 1006 |
int err; int n; |
18eba7aae [PATCH] jbd2: swi... |
1007 |
unsigned long long blocknr; |
470decc61 [PATCH] jbd2: ini... |
1008 1009 1010 1011 1012 1013 |
if (!journal) return NULL; journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev; journal->j_inode = inode; |
05496769e jbd2: clean up ho... |
1014 1015 1016 1017 1018 |
bdevname(journal->j_dev, journal->j_devname); p = journal->j_devname; while ((p = strchr(p, '/'))) *p = '!'; p = journal->j_devname + strlen(journal->j_devname); |
90576c0b9 ext4, jbd2: Drop ... |
1019 |
sprintf(p, "-%lu", journal->j_inode->i_ino); |
470decc61 [PATCH] jbd2: ini... |
1020 1021 1022 1023 1024 1025 1026 1027 1028 |
jbd_debug(1, "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld ", journal, inode->i_sb->s_id, inode->i_ino, (long long) inode->i_size, inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize); journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits; journal->j_blocksize = inode->i_sb->s_blocksize; |
8e85fb3f3 jbd2: jbd2 stats ... |
1029 |
jbd2_stats_proc_init(journal); |
470decc61 [PATCH] jbd2: ini... |
1030 1031 1032 1033 1034 1035 |
/* journal descriptor can store up to n blocks -bzzz */ n = journal->j_blocksize / sizeof(journal_block_tag_t); journal->j_wbufsize = n; journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL); if (!journal->j_wbuf) { |
25985edce Fix common misspe... |
1036 1037 |
printk(KERN_ERR "%s: Can't allocate bhs for commit thread ", |
329d291f5 jdb2: replace rem... |
1038 |
__func__); |
4b905671d jbd2: Fix oops in... |
1039 |
goto out_err; |
470decc61 [PATCH] jbd2: ini... |
1040 |
} |
f7f4bccb7 [PATCH] jbd2: ren... |
1041 |
err = jbd2_journal_bmap(journal, 0, &blocknr); |
470decc61 [PATCH] jbd2: ini... |
1042 1043 |
/* If that failed, give up */ if (err) { |
3c26bdb42 jbd: Remove one t... |
1044 1045 |
printk(KERN_ERR "%s: Cannot locate journal superblock ", |
329d291f5 jdb2: replace rem... |
1046 |
__func__); |
4b905671d jbd2: Fix oops in... |
1047 |
goto out_err; |
470decc61 [PATCH] jbd2: ini... |
1048 1049 1050 |
} bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize); |
4b905671d jbd2: Fix oops in... |
1051 1052 1053 1054 1055 1056 1057 |
if (!bh) { printk(KERN_ERR "%s: Cannot get buffer for journal superblock ", __func__); goto out_err; } |
470decc61 [PATCH] jbd2: ini... |
1058 1059 1060 1061 |
journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; return journal; |
4b905671d jbd2: Fix oops in... |
1062 |
out_err: |
7b02bec07 JBD/JBD2: free j_... |
1063 |
kfree(journal->j_wbuf); |
4b905671d jbd2: Fix oops in... |
1064 1065 1066 |
jbd2_stats_proc_exit(journal); kfree(journal); return NULL; |
470decc61 [PATCH] jbd2: ini... |
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 |
} /* * If the journal init or create aborts, we need to mark the journal * superblock as being NULL to prevent the journal destroy from writing * back a bogus superblock. */ static void journal_fail_superblock (journal_t *journal) { struct buffer_head *bh = journal->j_sb_buffer; brelse(bh); journal->j_sb_buffer = NULL; } /* * Given a journal_t structure, initialise the various fields for * startup of a new journaling session. We use this both when creating * a journal, and after recovering an old journal to reset it for * subsequent use. */ static int journal_reset(journal_t *journal) { journal_superblock_t *sb = journal->j_superblock; |
18eba7aae [PATCH] jbd2: swi... |
1091 |
unsigned long long first, last; |
470decc61 [PATCH] jbd2: ini... |
1092 1093 1094 |
first = be32_to_cpu(sb->s_first); last = be32_to_cpu(sb->s_maxlen); |
f6f50e28f jbd2: Fail to loa... |
1095 |
if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) { |
f2a44523b jbd2: Unify log m... |
1096 1097 |
printk(KERN_ERR "JBD2: Journal too short (blocks %llu-%llu). ", |
f6f50e28f jbd2: Fail to loa... |
1098 1099 1100 1101 |
first, last); journal_fail_superblock(journal); return -EINVAL; } |
470decc61 [PATCH] jbd2: ini... |
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
journal->j_first = first; journal->j_last = last; journal->j_head = first; journal->j_tail = first; journal->j_free = last - first; journal->j_tail_sequence = journal->j_transaction_sequence; journal->j_commit_sequence = journal->j_transaction_sequence - 1; journal->j_commit_request = journal->j_commit_sequence; journal->j_max_transaction_buffers = journal->j_maxlen / 4; /* Add the dynamic fields and write it to disk. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1117 |
jbd2_journal_update_superblock(journal, 1); |
97f067846 jbd: check for er... |
1118 |
return jbd2_journal_start_thread(journal); |
470decc61 [PATCH] jbd2: ini... |
1119 1120 1121 |
} /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1122 |
* void jbd2_journal_update_superblock() - Update journal sb on disk. |
470decc61 [PATCH] jbd2: ini... |
1123 1124 1125 1126 1127 1128 |
* @journal: The journal to update. * @wait: Set to '0' if you don't want to wait for IO completion. * * Update a journal's dynamic superblock fields and write it to disk, * optionally waiting for the IO to complete. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1129 |
void jbd2_journal_update_superblock(journal_t *journal, int wait) |
470decc61 [PATCH] jbd2: ini... |
1130 1131 1132 1133 1134 1135 1136 1137 |
{ journal_superblock_t *sb = journal->j_superblock; struct buffer_head *bh = journal->j_sb_buffer; /* * As a special case, if the on-disk copy is already marked as needing * no recovery (s_start == 0) and there are no outstanding transactions * in the filesystem, then we can safely defer the superblock update |
f7f4bccb7 [PATCH] jbd2: ren... |
1138 |
* until the next commit by setting JBD2_FLUSHED. This avoids |
470decc61 [PATCH] jbd2: ini... |
1139 1140 1141 1142 |
* attempting a write to a potential-readonly device. */ if (sb->s_start == 0 && journal->j_tail_sequence == journal->j_transaction_sequence) { |
f2a44523b jbd2: Unify log m... |
1143 |
jbd_debug(1, "JBD2: Skipping superblock update on recovered sb " |
470decc61 [PATCH] jbd2: ini... |
1144 1145 1146 1147 1148 1149 |
"(start %ld, seq %d, errno %d) ", journal->j_tail, journal->j_tail_sequence, journal->j_errno); goto out; } |
914258bf2 ext4/jbd2: Avoid ... |
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 |
if (buffer_write_io_error(bh)) { /* * Oh, dear. A previous attempt to write the journal * superblock failed. This could happen because the * USB device was yanked out. Or it could happen to * be a transient write error and maybe the block will * be remapped. Nothing we can do but to retry the * write and hope for the best. */ printk(KERN_ERR "JBD2: previous I/O error detected " "for journal superblock update for %s. ", journal->j_devname); clear_buffer_write_io_error(bh); set_buffer_uptodate(bh); } |
a931da6ac jbd2: Change j_st... |
1166 |
read_lock(&journal->j_state_lock); |
f2a44523b jbd2: Unify log m... |
1167 1168 |
jbd_debug(1, "JBD2: updating superblock (start %ld, seq %d, errno %d) ", |
470decc61 [PATCH] jbd2: ini... |
1169 1170 1171 1172 1173 |
journal->j_tail, journal->j_tail_sequence, journal->j_errno); sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); sb->s_start = cpu_to_be32(journal->j_tail); sb->s_errno = cpu_to_be32(journal->j_errno); |
a931da6ac jbd2: Change j_st... |
1174 |
read_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1175 1176 1177 |
BUFFER_TRACE(bh, "marking dirty"); mark_buffer_dirty(bh); |
914258bf2 ext4/jbd2: Avoid ... |
1178 |
if (wait) { |
470decc61 [PATCH] jbd2: ini... |
1179 |
sync_dirty_buffer(bh); |
914258bf2 ext4/jbd2: Avoid ... |
1180 1181 1182 1183 1184 1185 1186 1187 1188 |
if (buffer_write_io_error(bh)) { printk(KERN_ERR "JBD2: I/O error detected " "when updating journal superblock for %s. ", journal->j_devname); clear_buffer_write_io_error(bh); set_buffer_uptodate(bh); } } else |
9cb569d60 remove SWRITE* I/... |
1189 |
write_dirty_buffer(bh, WRITE); |
470decc61 [PATCH] jbd2: ini... |
1190 1191 1192 1193 1194 |
out: /* If we have just flushed the log (by marking s_start==0), then * any future commit will have to be careful to update the * superblock again to re-record the true start of the log. */ |
a931da6ac jbd2: Change j_st... |
1195 |
write_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1196 |
if (sb->s_start) |
f7f4bccb7 [PATCH] jbd2: ren... |
1197 |
journal->j_flags &= ~JBD2_FLUSHED; |
470decc61 [PATCH] jbd2: ini... |
1198 |
else |
f7f4bccb7 [PATCH] jbd2: ren... |
1199 |
journal->j_flags |= JBD2_FLUSHED; |
a931da6ac jbd2: Change j_st... |
1200 |
write_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 |
} /* * Read the superblock for a given journal, performing initial * validation of the format. */ static int journal_get_superblock(journal_t *journal) { struct buffer_head *bh; journal_superblock_t *sb; int err = -EIO; bh = journal->j_sb_buffer; J_ASSERT(bh != NULL); if (!buffer_uptodate(bh)) { ll_rw_block(READ, 1, &bh); wait_on_buffer(bh); if (!buffer_uptodate(bh)) { |
f2a44523b jbd2: Unify log m... |
1221 1222 1223 |
printk(KERN_ERR "JBD2: IO error reading journal superblock "); |
470decc61 [PATCH] jbd2: ini... |
1224 1225 1226 1227 1228 1229 1230 |
goto out; } } sb = journal->j_superblock; err = -EINVAL; |
f7f4bccb7 [PATCH] jbd2: ren... |
1231 |
if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || |
470decc61 [PATCH] jbd2: ini... |
1232 |
sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) { |
f2a44523b jbd2: Unify log m... |
1233 1234 |
printk(KERN_WARNING "JBD2: no valid journal superblock found "); |
470decc61 [PATCH] jbd2: ini... |
1235 1236 1237 1238 |
goto out; } switch(be32_to_cpu(sb->s_header.h_blocktype)) { |
f7f4bccb7 [PATCH] jbd2: ren... |
1239 |
case JBD2_SUPERBLOCK_V1: |
470decc61 [PATCH] jbd2: ini... |
1240 1241 |
journal->j_format_version = 1; break; |
f7f4bccb7 [PATCH] jbd2: ren... |
1242 |
case JBD2_SUPERBLOCK_V2: |
470decc61 [PATCH] jbd2: ini... |
1243 1244 1245 |
journal->j_format_version = 2; break; default: |
f2a44523b jbd2: Unify log m... |
1246 1247 |
printk(KERN_WARNING "JBD2: unrecognised superblock format ID "); |
470decc61 [PATCH] jbd2: ini... |
1248 1249 1250 1251 1252 1253 |
goto out; } if (be32_to_cpu(sb->s_maxlen) < journal->j_maxlen) journal->j_maxlen = be32_to_cpu(sb->s_maxlen); else if (be32_to_cpu(sb->s_maxlen) > journal->j_maxlen) { |
f2a44523b jbd2: Unify log m... |
1254 1255 |
printk(KERN_WARNING "JBD2: journal file too short "); |
470decc61 [PATCH] jbd2: ini... |
1256 1257 |
goto out; } |
8762202dd jbd/jbd2: validat... |
1258 1259 1260 1261 1262 1263 1264 1265 |
if (be32_to_cpu(sb->s_first) == 0 || be32_to_cpu(sb->s_first) >= journal->j_maxlen) { printk(KERN_WARNING "JBD2: Invalid start block of journal: %u ", be32_to_cpu(sb->s_first)); goto out; } |
470decc61 [PATCH] jbd2: ini... |
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 |
return 0; out: journal_fail_superblock(journal); return err; } /* * Load the on-disk journal superblock and read the key fields into the * journal_t. */ static int load_superblock(journal_t *journal) { int err; journal_superblock_t *sb; err = journal_get_superblock(journal); if (err) return err; sb = journal->j_superblock; journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); journal->j_tail = be32_to_cpu(sb->s_start); journal->j_first = be32_to_cpu(sb->s_first); journal->j_last = be32_to_cpu(sb->s_maxlen); journal->j_errno = be32_to_cpu(sb->s_errno); return 0; } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1300 |
* int jbd2_journal_load() - Read journal from disk. |
470decc61 [PATCH] jbd2: ini... |
1301 1302 1303 1304 1305 1306 |
* @journal: Journal to act on. * * Given a journal_t structure which tells us which disk blocks contain * a journal, read the journal from disk to initialise the in-memory * structures. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1307 |
int jbd2_journal_load(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 |
{ int err; journal_superblock_t *sb; err = load_superblock(journal); if (err) return err; sb = journal->j_superblock; /* If this is a V2 superblock, then we have to check the * features flags on it. */ if (journal->j_format_version >= 2) { if ((sb->s_feature_ro_compat & |
f7f4bccb7 [PATCH] jbd2: ren... |
1322 |
~cpu_to_be32(JBD2_KNOWN_ROCOMPAT_FEATURES)) || |
470decc61 [PATCH] jbd2: ini... |
1323 |
(sb->s_feature_incompat & |
f7f4bccb7 [PATCH] jbd2: ren... |
1324 |
~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) { |
f2a44523b jbd2: Unify log m... |
1325 1326 1327 |
printk(KERN_WARNING "JBD2: Unrecognised features on journal "); |
470decc61 [PATCH] jbd2: ini... |
1328 1329 1330 |
return -EINVAL; } } |
d2eecb039 ext4: Use slab al... |
1331 1332 1333 1334 1335 1336 |
/* * Create a slab for this blocksize */ err = jbd2_journal_create_slab(be32_to_cpu(sb->s_blocksize)); if (err) return err; |
470decc61 [PATCH] jbd2: ini... |
1337 1338 |
/* Let the recovery code check whether it needs to recover any * data from the journal. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1339 |
if (jbd2_journal_recover(journal)) |
470decc61 [PATCH] jbd2: ini... |
1340 |
goto recovery_error; |
e6a47428d jbd2: don't wipe ... |
1341 1342 1343 1344 1345 1346 1347 |
if (journal->j_failed_commit) { printk(KERN_ERR "JBD2: journal transaction %u on %s " "is corrupt. ", journal->j_failed_commit, journal->j_devname); return -EIO; } |
470decc61 [PATCH] jbd2: ini... |
1348 1349 1350 1351 1352 |
/* OK, we've finished with the dynamic journal bits: * reinitialise the dynamic contents of the superblock in memory * and reset them on disk. */ if (journal_reset(journal)) goto recovery_error; |
f7f4bccb7 [PATCH] jbd2: ren... |
1353 1354 |
journal->j_flags &= ~JBD2_ABORT; journal->j_flags |= JBD2_LOADED; |
470decc61 [PATCH] jbd2: ini... |
1355 1356 1357 |
return 0; recovery_error: |
f2a44523b jbd2: Unify log m... |
1358 1359 |
printk(KERN_WARNING "JBD2: recovery failed "); |
470decc61 [PATCH] jbd2: ini... |
1360 1361 1362 1363 |
return -EIO; } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1364 |
* void jbd2_journal_destroy() - Release a journal_t structure. |
470decc61 [PATCH] jbd2: ini... |
1365 1366 1367 1368 |
* @journal: Journal to act on. * * Release a journal_t structure once it is no longer in use by the * journaled object. |
44519faf2 jbd2: fix error h... |
1369 |
* Return <0 if we couldn't clean up the journal. |
470decc61 [PATCH] jbd2: ini... |
1370 |
*/ |
44519faf2 jbd2: fix error h... |
1371 |
int jbd2_journal_destroy(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1372 |
{ |
44519faf2 jbd2: fix error h... |
1373 |
int err = 0; |
470decc61 [PATCH] jbd2: ini... |
1374 1375 1376 1377 1378 |
/* Wait for the commit thread to wake up and die. */ journal_kill_thread(journal); /* Force a final log commit */ if (journal->j_running_transaction) |
f7f4bccb7 [PATCH] jbd2: ren... |
1379 |
jbd2_journal_commit_transaction(journal); |
470decc61 [PATCH] jbd2: ini... |
1380 1381 1382 1383 1384 1385 1386 |
/* Force any old transactions to disk */ /* Totally anal locking here... */ spin_lock(&journal->j_list_lock); while (journal->j_checkpoint_transactions != NULL) { spin_unlock(&journal->j_list_lock); |
1a0d3786d jbd2: Remove a la... |
1387 |
mutex_lock(&journal->j_checkpoint_mutex); |
f7f4bccb7 [PATCH] jbd2: ren... |
1388 |
jbd2_log_do_checkpoint(journal); |
1a0d3786d jbd2: Remove a la... |
1389 |
mutex_unlock(&journal->j_checkpoint_mutex); |
470decc61 [PATCH] jbd2: ini... |
1390 1391 1392 1393 1394 1395 1396 |
spin_lock(&journal->j_list_lock); } J_ASSERT(journal->j_running_transaction == NULL); J_ASSERT(journal->j_committing_transaction == NULL); J_ASSERT(journal->j_checkpoint_transactions == NULL); spin_unlock(&journal->j_list_lock); |
470decc61 [PATCH] jbd2: ini... |
1397 |
if (journal->j_sb_buffer) { |
44519faf2 jbd2: fix error h... |
1398 1399 1400 1401 1402 1403 1404 1405 1406 |
if (!is_journal_aborted(journal)) { /* We can now mark the journal as empty. */ journal->j_tail = 0; journal->j_tail_sequence = ++journal->j_transaction_sequence; jbd2_journal_update_superblock(journal, 1); } else { err = -EIO; } |
470decc61 [PATCH] jbd2: ini... |
1407 1408 |
brelse(journal->j_sb_buffer); } |
8e85fb3f3 jbd2: jbd2 stats ... |
1409 1410 |
if (journal->j_proc_entry) jbd2_stats_proc_exit(journal); |
470decc61 [PATCH] jbd2: ini... |
1411 1412 1413 |
if (journal->j_inode) iput(journal->j_inode); if (journal->j_revoke) |
f7f4bccb7 [PATCH] jbd2: ren... |
1414 |
jbd2_journal_destroy_revoke(journal); |
470decc61 [PATCH] jbd2: ini... |
1415 1416 |
kfree(journal->j_wbuf); kfree(journal); |
44519faf2 jbd2: fix error h... |
1417 1418 |
return err; |
470decc61 [PATCH] jbd2: ini... |
1419 1420 1421 1422 |
} /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1423 |
*int jbd2_journal_check_used_features () - Check if features specified are used. |
470decc61 [PATCH] jbd2: ini... |
1424 1425 1426 1427 1428 1429 1430 1431 |
* @journal: Journal to check. * @compat: bitmask of compatible features * @ro: bitmask of features that force read-only mount * @incompat: bitmask of incompatible features * * Check whether the journal uses all of a given set of * features. Return true (non-zero) if it does. **/ |
f7f4bccb7 [PATCH] jbd2: ren... |
1432 |
int jbd2_journal_check_used_features (journal_t *journal, unsigned long compat, |
470decc61 [PATCH] jbd2: ini... |
1433 1434 1435 1436 1437 1438 |
unsigned long ro, unsigned long incompat) { journal_superblock_t *sb; if (!compat && !ro && !incompat) return 1; |
1113e1b50 JBD2: Allow featu... |
1439 1440 1441 1442 |
/* Load journal superblock if it is not loaded yet. */ if (journal->j_format_version == 0 && journal_get_superblock(journal) != 0) return 0; |
470decc61 [PATCH] jbd2: ini... |
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 |
if (journal->j_format_version == 1) return 0; sb = journal->j_superblock; if (((be32_to_cpu(sb->s_feature_compat) & compat) == compat) && ((be32_to_cpu(sb->s_feature_ro_compat) & ro) == ro) && ((be32_to_cpu(sb->s_feature_incompat) & incompat) == incompat)) return 1; return 0; } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1457 |
* int jbd2_journal_check_available_features() - Check feature set in journalling layer |
470decc61 [PATCH] jbd2: ini... |
1458 1459 1460 1461 1462 1463 1464 1465 |
* @journal: Journal to check. * @compat: bitmask of compatible features * @ro: bitmask of features that force read-only mount * @incompat: bitmask of incompatible features * * Check whether the journaling code supports the use of * all of a given set of features on this journal. Return true * (non-zero) if it can. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1466 |
int jbd2_journal_check_available_features (journal_t *journal, unsigned long compat, |
470decc61 [PATCH] jbd2: ini... |
1467 1468 |
unsigned long ro, unsigned long incompat) { |
470decc61 [PATCH] jbd2: ini... |
1469 1470 |
if (!compat && !ro && !incompat) return 1; |
470decc61 [PATCH] jbd2: ini... |
1471 1472 1473 1474 1475 1476 |
/* We can support any known requested features iff the * superblock is in version 2. Otherwise we fail to support any * extended sb features. */ if (journal->j_format_version != 2) return 0; |
f7f4bccb7 [PATCH] jbd2: ren... |
1477 1478 1479 |
if ((compat & JBD2_KNOWN_COMPAT_FEATURES) == compat && (ro & JBD2_KNOWN_ROCOMPAT_FEATURES) == ro && (incompat & JBD2_KNOWN_INCOMPAT_FEATURES) == incompat) |
470decc61 [PATCH] jbd2: ini... |
1480 1481 1482 1483 1484 1485 |
return 1; return 0; } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1486 |
* int jbd2_journal_set_features () - Mark a given journal feature in the superblock |
470decc61 [PATCH] jbd2: ini... |
1487 1488 1489 1490 1491 1492 1493 1494 1495 |
* @journal: Journal to act on. * @compat: bitmask of compatible features * @ro: bitmask of features that force read-only mount * @incompat: bitmask of incompatible features * * Mark a given journal feature as present on the * superblock. Returns true if the requested features could be set. * */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1496 |
int jbd2_journal_set_features (journal_t *journal, unsigned long compat, |
470decc61 [PATCH] jbd2: ini... |
1497 1498 1499 |
unsigned long ro, unsigned long incompat) { journal_superblock_t *sb; |
f7f4bccb7 [PATCH] jbd2: ren... |
1500 |
if (jbd2_journal_check_used_features(journal, compat, ro, incompat)) |
470decc61 [PATCH] jbd2: ini... |
1501 |
return 1; |
f7f4bccb7 [PATCH] jbd2: ren... |
1502 |
if (!jbd2_journal_check_available_features(journal, compat, ro, incompat)) |
470decc61 [PATCH] jbd2: ini... |
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 |
return 0; jbd_debug(1, "Setting new features 0x%lx/0x%lx/0x%lx ", compat, ro, incompat); sb = journal->j_superblock; sb->s_feature_compat |= cpu_to_be32(compat); sb->s_feature_ro_compat |= cpu_to_be32(ro); sb->s_feature_incompat |= cpu_to_be32(incompat); return 1; } |
818d276ce ext4: Add the jou... |
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 |
/* * jbd2_journal_clear_features () - Clear a given journal feature in the * superblock * @journal: Journal to act on. * @compat: bitmask of compatible features * @ro: bitmask of features that force read-only mount * @incompat: bitmask of incompatible features * * Clear a given journal feature as present on the * superblock. */ void jbd2_journal_clear_features(journal_t *journal, unsigned long compat, unsigned long ro, unsigned long incompat) { journal_superblock_t *sb; jbd_debug(1, "Clear features 0x%lx/0x%lx/0x%lx ", compat, ro, incompat); sb = journal->j_superblock; sb->s_feature_compat &= ~cpu_to_be32(compat); sb->s_feature_ro_compat &= ~cpu_to_be32(ro); sb->s_feature_incompat &= ~cpu_to_be32(incompat); } EXPORT_SYMBOL(jbd2_journal_clear_features); |
470decc61 [PATCH] jbd2: ini... |
1544 1545 |
/** |
f7f4bccb7 [PATCH] jbd2: ren... |
1546 |
* int jbd2_journal_update_format () - Update on-disk journal structure. |
470decc61 [PATCH] jbd2: ini... |
1547 1548 1549 1550 1551 |
* @journal: Journal to act on. * * Given an initialised but unloaded journal struct, poke about in the * on-disk structure to update it to the most recent supported version. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1552 |
int jbd2_journal_update_format (journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 |
{ journal_superblock_t *sb; int err; err = journal_get_superblock(journal); if (err) return err; sb = journal->j_superblock; switch (be32_to_cpu(sb->s_header.h_blocktype)) { |
f7f4bccb7 [PATCH] jbd2: ren... |
1564 |
case JBD2_SUPERBLOCK_V2: |
470decc61 [PATCH] jbd2: ini... |
1565 |
return 0; |
f7f4bccb7 [PATCH] jbd2: ren... |
1566 |
case JBD2_SUPERBLOCK_V1: |
470decc61 [PATCH] jbd2: ini... |
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 |
return journal_convert_superblock_v1(journal, sb); default: break; } return -EINVAL; } static int journal_convert_superblock_v1(journal_t *journal, journal_superblock_t *sb) { int offset, blocksize; struct buffer_head *bh; printk(KERN_WARNING |
f2a44523b jbd2: Unify log m... |
1581 1582 |
"JBD2: Converting superblock from version 1 to 2. "); |
470decc61 [PATCH] jbd2: ini... |
1583 1584 1585 1586 1587 1588 1589 |
/* Pre-initialise new fields to zero */ offset = ((char *) &(sb->s_feature_compat)) - ((char *) sb); blocksize = be32_to_cpu(sb->s_blocksize); memset(&sb->s_feature_compat, 0, blocksize-offset); sb->s_nr_users = cpu_to_be32(1); |
f7f4bccb7 [PATCH] jbd2: ren... |
1590 |
sb->s_header.h_blocktype = cpu_to_be32(JBD2_SUPERBLOCK_V2); |
470decc61 [PATCH] jbd2: ini... |
1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 |
journal->j_format_version = 2; bh = journal->j_sb_buffer; BUFFER_TRACE(bh, "marking dirty"); mark_buffer_dirty(bh); sync_dirty_buffer(bh); return 0; } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1602 |
* int jbd2_journal_flush () - Flush journal |
470decc61 [PATCH] jbd2: ini... |
1603 1604 1605 1606 1607 1608 |
* @journal: Journal to act on. * * Flush all data for a given journal to disk and empty the journal. * Filesystems can use this when remounting readonly to ensure that * recovery does not need to happen on remount. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1609 |
int jbd2_journal_flush(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1610 1611 1612 1613 |
{ int err = 0; transaction_t *transaction = NULL; unsigned long old_tail; |
a931da6ac jbd2: Change j_st... |
1614 |
write_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1615 1616 1617 1618 |
/* Force everything buffered to the log... */ if (journal->j_running_transaction) { transaction = journal->j_running_transaction; |
f7f4bccb7 [PATCH] jbd2: ren... |
1619 |
__jbd2_log_start_commit(journal, transaction->t_tid); |
470decc61 [PATCH] jbd2: ini... |
1620 1621 1622 1623 1624 1625 |
} else if (journal->j_committing_transaction) transaction = journal->j_committing_transaction; /* Wait for the log commit to complete... */ if (transaction) { tid_t tid = transaction->t_tid; |
a931da6ac jbd2: Change j_st... |
1626 |
write_unlock(&journal->j_state_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
1627 |
jbd2_log_wait_commit(journal, tid); |
470decc61 [PATCH] jbd2: ini... |
1628 |
} else { |
a931da6ac jbd2: Change j_st... |
1629 |
write_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1630 1631 1632 1633 1634 1635 |
} /* ...and flush everything in the log out to disk. */ spin_lock(&journal->j_list_lock); while (!err && journal->j_checkpoint_transactions != NULL) { spin_unlock(&journal->j_list_lock); |
44519faf2 jbd2: fix error h... |
1636 |
mutex_lock(&journal->j_checkpoint_mutex); |
f7f4bccb7 [PATCH] jbd2: ren... |
1637 |
err = jbd2_log_do_checkpoint(journal); |
44519faf2 jbd2: fix error h... |
1638 |
mutex_unlock(&journal->j_checkpoint_mutex); |
470decc61 [PATCH] jbd2: ini... |
1639 1640 1641 |
spin_lock(&journal->j_list_lock); } spin_unlock(&journal->j_list_lock); |
44519faf2 jbd2: fix error h... |
1642 1643 1644 |
if (is_journal_aborted(journal)) return -EIO; |
f7f4bccb7 [PATCH] jbd2: ren... |
1645 |
jbd2_cleanup_journal_tail(journal); |
470decc61 [PATCH] jbd2: ini... |
1646 1647 1648 1649 1650 1651 |
/* Finally, mark the journal as really needing no recovery. * This sets s_start==0 in the underlying superblock, which is * the magic code for a fully-recovered superblock. Any future * commits of data to the journal will restore the current * s_start value. */ |
a931da6ac jbd2: Change j_st... |
1652 |
write_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1653 1654 |
old_tail = journal->j_tail; journal->j_tail = 0; |
a931da6ac jbd2: Change j_st... |
1655 |
write_unlock(&journal->j_state_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
1656 |
jbd2_journal_update_superblock(journal, 1); |
a931da6ac jbd2: Change j_st... |
1657 |
write_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1658 1659 1660 1661 1662 1663 1664 |
journal->j_tail = old_tail; J_ASSERT(!journal->j_running_transaction); J_ASSERT(!journal->j_committing_transaction); J_ASSERT(!journal->j_checkpoint_transactions); J_ASSERT(journal->j_head == journal->j_tail); J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence); |
a931da6ac jbd2: Change j_st... |
1665 |
write_unlock(&journal->j_state_lock); |
44519faf2 jbd2: fix error h... |
1666 |
return 0; |
470decc61 [PATCH] jbd2: ini... |
1667 1668 1669 |
} /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1670 |
* int jbd2_journal_wipe() - Wipe journal contents |
470decc61 [PATCH] jbd2: ini... |
1671 1672 1673 1674 1675 |
* @journal: Journal to act on. * @write: flag (see below) * * Wipe out all of the contents of a journal, safely. This will produce * a warning if the journal contains any valid recovery information. |
f7f4bccb7 [PATCH] jbd2: ren... |
1676 |
* Must be called between journal_init_*() and jbd2_journal_load(). |
470decc61 [PATCH] jbd2: ini... |
1677 1678 1679 1680 |
* * If 'write' is non-zero, then we wipe out the journal on disk; otherwise * we merely suppress recovery. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1681 |
int jbd2_journal_wipe(journal_t *journal, int write) |
470decc61 [PATCH] jbd2: ini... |
1682 |
{ |
470decc61 [PATCH] jbd2: ini... |
1683 |
int err = 0; |
f7f4bccb7 [PATCH] jbd2: ren... |
1684 |
J_ASSERT (!(journal->j_flags & JBD2_LOADED)); |
470decc61 [PATCH] jbd2: ini... |
1685 1686 1687 1688 |
err = load_superblock(journal); if (err) return err; |
470decc61 [PATCH] jbd2: ini... |
1689 1690 |
if (!journal->j_tail) goto no_recovery; |
f2a44523b jbd2: Unify log m... |
1691 1692 |
printk(KERN_WARNING "JBD2: %s recovery information on journal ", |
470decc61 [PATCH] jbd2: ini... |
1693 |
write ? "Clearing" : "Ignoring"); |
f7f4bccb7 [PATCH] jbd2: ren... |
1694 |
err = jbd2_journal_skip_recovery(journal); |
470decc61 [PATCH] jbd2: ini... |
1695 |
if (write) |
f7f4bccb7 [PATCH] jbd2: ren... |
1696 |
jbd2_journal_update_superblock(journal, 1); |
470decc61 [PATCH] jbd2: ini... |
1697 1698 1699 1700 1701 1702 |
no_recovery: return err; } /* |
470decc61 [PATCH] jbd2: ini... |
1703 1704 1705 |
* Journal abort has very specific semantics, which we describe * for journal abort. * |
bfcd3555a jbd2: Fix minor t... |
1706 |
* Two internal functions, which provide abort to the jbd layer |
470decc61 [PATCH] jbd2: ini... |
1707 1708 1709 1710 1711 1712 1713 1714 |
* itself are here. */ /* * Quick version for internal journal use (doesn't lock the journal). * Aborts hard --- we mark the abort as occurred, but do _nothing_ else, * and don't attempt to make any other journal updates. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1715 |
void __jbd2_journal_abort_hard(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1716 1717 |
{ transaction_t *transaction; |
470decc61 [PATCH] jbd2: ini... |
1718 |
|
f7f4bccb7 [PATCH] jbd2: ren... |
1719 |
if (journal->j_flags & JBD2_ABORT) |
470decc61 [PATCH] jbd2: ini... |
1720 1721 1722 1723 |
return; printk(KERN_ERR "Aborting journal on device %s. ", |
05496769e jbd2: clean up ho... |
1724 |
journal->j_devname); |
470decc61 [PATCH] jbd2: ini... |
1725 |
|
a931da6ac jbd2: Change j_st... |
1726 |
write_lock(&journal->j_state_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
1727 |
journal->j_flags |= JBD2_ABORT; |
470decc61 [PATCH] jbd2: ini... |
1728 1729 |
transaction = journal->j_running_transaction; if (transaction) |
f7f4bccb7 [PATCH] jbd2: ren... |
1730 |
__jbd2_log_start_commit(journal, transaction->t_tid); |
a931da6ac jbd2: Change j_st... |
1731 |
write_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1732 1733 1734 1735 1736 1737 |
} /* Soft abort: record the abort error status in the journal superblock, * but don't do any other IO. */ static void __journal_abort_soft (journal_t *journal, int errno) { |
f7f4bccb7 [PATCH] jbd2: ren... |
1738 |
if (journal->j_flags & JBD2_ABORT) |
470decc61 [PATCH] jbd2: ini... |
1739 1740 1741 1742 |
return; if (!journal->j_errno) journal->j_errno = errno; |
f7f4bccb7 [PATCH] jbd2: ren... |
1743 |
__jbd2_journal_abort_hard(journal); |
470decc61 [PATCH] jbd2: ini... |
1744 1745 |
if (errno) |
f7f4bccb7 [PATCH] jbd2: ren... |
1746 |
jbd2_journal_update_superblock(journal, 1); |
470decc61 [PATCH] jbd2: ini... |
1747 1748 1749 |
} /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1750 |
* void jbd2_journal_abort () - Shutdown the journal immediately. |
470decc61 [PATCH] jbd2: ini... |
1751 1752 1753 1754 1755 1756 1757 1758 |
* @journal: the journal to shutdown. * @errno: an error number to record in the journal indicating * the reason for the shutdown. * * Perform a complete, immediate shutdown of the ENTIRE * journal (not of a single transaction). This operation cannot be * undone without closing and reopening the journal. * |
f7f4bccb7 [PATCH] jbd2: ren... |
1759 |
* The jbd2_journal_abort function is intended to support higher level error |
470decc61 [PATCH] jbd2: ini... |
1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 |
* recovery mechanisms such as the ext2/ext3 remount-readonly error * mode. * * Journal abort has very specific semantics. Any existing dirty, * unjournaled buffers in the main filesystem will still be written to * disk by bdflush, but the journaling mechanism will be suspended * immediately and no further transaction commits will be honoured. * * Any dirty, journaled buffers will be written back to disk without * hitting the journal. Atomicity cannot be guaranteed on an aborted * filesystem, but we _do_ attempt to leave as much data as possible * behind for fsck to use for cleanup. * * Any attempt to get a new transaction handle on a journal which is in * ABORT state will just result in an -EROFS error return. A |
f7f4bccb7 [PATCH] jbd2: ren... |
1775 |
* jbd2_journal_stop on an existing handle will return -EIO if we have |
470decc61 [PATCH] jbd2: ini... |
1776 1777 1778 |
* entered abort state during the update. * * Recursive transactions are not disturbed by journal abort until the |
f7f4bccb7 [PATCH] jbd2: ren... |
1779 |
* final jbd2_journal_stop, which will receive the -EIO error. |
470decc61 [PATCH] jbd2: ini... |
1780 |
* |
f7f4bccb7 [PATCH] jbd2: ren... |
1781 |
* Finally, the jbd2_journal_abort call allows the caller to supply an errno |
470decc61 [PATCH] jbd2: ini... |
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 |
* which will be recorded (if possible) in the journal superblock. This * allows a client to record failure conditions in the middle of a * transaction without having to complete the transaction to record the * failure to disk. ext3_error, for example, now uses this * functionality. * * Errors which originate from within the journaling layer will NOT * supply an errno; a null errno implies that absolutely no further * writes are done to the journal (unless there are any already in * progress). * */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1794 |
void jbd2_journal_abort(journal_t *journal, int errno) |
470decc61 [PATCH] jbd2: ini... |
1795 1796 1797 1798 1799 |
{ __journal_abort_soft(journal, errno); } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1800 |
* int jbd2_journal_errno () - returns the journal's error state. |
470decc61 [PATCH] jbd2: ini... |
1801 1802 |
* @journal: journal to examine. * |
bfcd3555a jbd2: Fix minor t... |
1803 |
* This is the errno number set with jbd2_journal_abort(), the last |
470decc61 [PATCH] jbd2: ini... |
1804 1805 1806 1807 1808 1809 |
* time the journal was mounted - if the journal was stopped * without calling abort this will be 0. * * If the journal has been aborted on this mount time -EROFS will * be returned. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1810 |
int jbd2_journal_errno(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1811 1812 |
{ int err; |
a931da6ac jbd2: Change j_st... |
1813 |
read_lock(&journal->j_state_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
1814 |
if (journal->j_flags & JBD2_ABORT) |
470decc61 [PATCH] jbd2: ini... |
1815 1816 1817 |
err = -EROFS; else err = journal->j_errno; |
a931da6ac jbd2: Change j_st... |
1818 |
read_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1819 1820 1821 1822 |
return err; } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1823 |
* int jbd2_journal_clear_err () - clears the journal's error state |
470decc61 [PATCH] jbd2: ini... |
1824 1825 |
* @journal: journal to act on. * |
bfcd3555a jbd2: Fix minor t... |
1826 |
* An error must be cleared or acked to take a FS out of readonly |
470decc61 [PATCH] jbd2: ini... |
1827 1828 |
* mode. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1829 |
int jbd2_journal_clear_err(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1830 1831 |
{ int err = 0; |
a931da6ac jbd2: Change j_st... |
1832 |
write_lock(&journal->j_state_lock); |
f7f4bccb7 [PATCH] jbd2: ren... |
1833 |
if (journal->j_flags & JBD2_ABORT) |
470decc61 [PATCH] jbd2: ini... |
1834 1835 1836 |
err = -EROFS; else journal->j_errno = 0; |
a931da6ac jbd2: Change j_st... |
1837 |
write_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1838 1839 1840 1841 |
return err; } /** |
f7f4bccb7 [PATCH] jbd2: ren... |
1842 |
* void jbd2_journal_ack_err() - Ack journal err. |
470decc61 [PATCH] jbd2: ini... |
1843 1844 |
* @journal: journal to act on. * |
bfcd3555a jbd2: Fix minor t... |
1845 |
* An error must be cleared or acked to take a FS out of readonly |
470decc61 [PATCH] jbd2: ini... |
1846 1847 |
* mode. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
1848 |
void jbd2_journal_ack_err(journal_t *journal) |
470decc61 [PATCH] jbd2: ini... |
1849 |
{ |
a931da6ac jbd2: Change j_st... |
1850 |
write_lock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1851 |
if (journal->j_errno) |
f7f4bccb7 [PATCH] jbd2: ren... |
1852 |
journal->j_flags |= JBD2_ACK_ERR; |
a931da6ac jbd2: Change j_st... |
1853 |
write_unlock(&journal->j_state_lock); |
470decc61 [PATCH] jbd2: ini... |
1854 |
} |
f7f4bccb7 [PATCH] jbd2: ren... |
1855 |
int jbd2_journal_blocks_per_page(struct inode *inode) |
470decc61 [PATCH] jbd2: ini... |
1856 1857 1858 1859 1860 |
{ return 1 << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); } /* |
b517bea1c [PATCH] 64-bit jb... |
1861 1862 1863 1864 1865 |
* helper functions to deal with 32 or 64bit block numbers. */ size_t journal_tag_bytes(journal_t *journal) { if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) |
cd02ff0b1 jbd2: JBD_XXX to ... |
1866 |
return JBD2_TAG_SIZE64; |
b517bea1c [PATCH] 64-bit jb... |
1867 |
else |
cd02ff0b1 jbd2: JBD_XXX to ... |
1868 |
return JBD2_TAG_SIZE32; |
b517bea1c [PATCH] 64-bit jb... |
1869 1870 1871 |
} /* |
d2eecb039 ext4: Use slab al... |
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 |
* JBD memory management * * These functions are used to allocate block-sized chunks of memory * used for making copies of buffer_head data. Very often it will be * page-sized chunks of data, but sometimes it will be in * sub-page-size chunks. (For example, 16k pages on Power systems * with a 4k block file system.) For blocks smaller than a page, we * use a SLAB allocator. There are slab caches for each block size, * which are allocated at mount time, if necessary, and we only free * (all of) the slab caches when/if the jbd2 module is unloaded. For * this reason we don't need to a mutex to protect access to * jbd2_slab[] allocating or releasing memory; only in * jbd2_journal_create_slab(). */ #define JBD2_MAX_SLABS 8 static struct kmem_cache *jbd2_slab[JBD2_MAX_SLABS]; |
d2eecb039 ext4: Use slab al... |
1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 |
static const char *jbd2_slab_names[JBD2_MAX_SLABS] = { "jbd2_1k", "jbd2_2k", "jbd2_4k", "jbd2_8k", "jbd2_16k", "jbd2_32k", "jbd2_64k", "jbd2_128k" }; static void jbd2_journal_destroy_slabs(void) { int i; for (i = 0; i < JBD2_MAX_SLABS; i++) { if (jbd2_slab[i]) kmem_cache_destroy(jbd2_slab[i]); jbd2_slab[i] = NULL; } } static int jbd2_journal_create_slab(size_t size) { |
51dfacdef jbd2: Convert jbd... |
1908 |
static DEFINE_MUTEX(jbd2_slab_create_mutex); |
d2eecb039 ext4: Use slab al... |
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 |
int i = order_base_2(size) - 10; size_t slab_size; if (size == PAGE_SIZE) return 0; if (i >= JBD2_MAX_SLABS) return -EINVAL; if (unlikely(i < 0)) i = 0; |
51dfacdef jbd2: Convert jbd... |
1920 |
mutex_lock(&jbd2_slab_create_mutex); |
d2eecb039 ext4: Use slab al... |
1921 |
if (jbd2_slab[i]) { |
51dfacdef jbd2: Convert jbd... |
1922 |
mutex_unlock(&jbd2_slab_create_mutex); |
d2eecb039 ext4: Use slab al... |
1923 1924 1925 1926 1927 1928 |
return 0; /* Already created */ } slab_size = 1 << (i+10); jbd2_slab[i] = kmem_cache_create(jbd2_slab_names[i], slab_size, slab_size, 0, NULL); |
51dfacdef jbd2: Convert jbd... |
1929 |
mutex_unlock(&jbd2_slab_create_mutex); |
d2eecb039 ext4: Use slab al... |
1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 |
if (!jbd2_slab[i]) { printk(KERN_EMERG "JBD2: no memory for jbd2_slab cache "); return -ENOMEM; } return 0; } static struct kmem_cache *get_slab(size_t size) { int i = order_base_2(size) - 10; BUG_ON(i >= JBD2_MAX_SLABS); if (unlikely(i < 0)) i = 0; |
8ac97b74b jbd2: use NULL in... |
1945 |
BUG_ON(jbd2_slab[i] == NULL); |
d2eecb039 ext4: Use slab al... |
1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 |
return jbd2_slab[i]; } void *jbd2_alloc(size_t size, gfp_t flags) { void *ptr; BUG_ON(size & (size-1)); /* Must be a power of 2 */ flags |= __GFP_REPEAT; if (size == PAGE_SIZE) ptr = (void *)__get_free_pages(flags, 0); else if (size > PAGE_SIZE) { int order = get_order(size); if (order < 3) ptr = (void *)__get_free_pages(flags, order); else ptr = vmalloc(size); } else ptr = kmem_cache_alloc(get_slab(size), flags); /* Check alignment; SLUB has gotten this wrong in the past, * and this can lead to user data corruption! */ BUG_ON(((unsigned long) ptr) & (size-1)); return ptr; } void jbd2_free(void *ptr, size_t size) { if (size == PAGE_SIZE) { free_pages((unsigned long)ptr, 0); return; } if (size > PAGE_SIZE) { int order = get_order(size); if (order < 3) free_pages((unsigned long)ptr, order); else vfree(ptr); return; } kmem_cache_free(get_slab(size), ptr); }; /* |
470decc61 [PATCH] jbd2: ini... |
1994 1995 |
* Journal_head storage management */ |
e18b890bb [PATCH] slab: rem... |
1996 |
static struct kmem_cache *jbd2_journal_head_cache; |
e23291b91 jbd2: Fix CONFIG_... |
1997 |
#ifdef CONFIG_JBD2_DEBUG |
470decc61 [PATCH] jbd2: ini... |
1998 1999 |
static atomic_t nr_journal_heads = ATOMIC_INIT(0); #endif |
f7f4bccb7 [PATCH] jbd2: ren... |
2000 |
static int journal_init_jbd2_journal_head_cache(void) |
470decc61 [PATCH] jbd2: ini... |
2001 2002 |
{ int retval; |
1076d17ac jbd/jbd2 NULL noise |
2003 |
J_ASSERT(jbd2_journal_head_cache == NULL); |
a920e9416 [PATCH] jbd2: ren... |
2004 |
jbd2_journal_head_cache = kmem_cache_create("jbd2_journal_head", |
470decc61 [PATCH] jbd2: ini... |
2005 2006 |
sizeof(struct journal_head), 0, /* offset */ |
77160957e jbd2: Mark jbd2 s... |
2007 |
SLAB_TEMPORARY, /* flags */ |
20c2df83d mm: Remove slab d... |
2008 |
NULL); /* ctor */ |
470decc61 [PATCH] jbd2: ini... |
2009 |
retval = 0; |
1076d17ac jbd/jbd2 NULL noise |
2010 |
if (!jbd2_journal_head_cache) { |
470decc61 [PATCH] jbd2: ini... |
2011 |
retval = -ENOMEM; |
f2a44523b jbd2: Unify log m... |
2012 2013 |
printk(KERN_EMERG "JBD2: no memory for journal_head cache "); |
470decc61 [PATCH] jbd2: ini... |
2014 2015 2016 |
} return retval; } |
f7f4bccb7 [PATCH] jbd2: ren... |
2017 |
static void jbd2_journal_destroy_jbd2_journal_head_cache(void) |
470decc61 [PATCH] jbd2: ini... |
2018 |
{ |
8a9362eb4 jbd2: replace pot... |
2019 2020 2021 2022 |
if (jbd2_journal_head_cache) { kmem_cache_destroy(jbd2_journal_head_cache); jbd2_journal_head_cache = NULL; } |
470decc61 [PATCH] jbd2: ini... |
2023 2024 2025 2026 2027 2028 2029 2030 |
} /* * journal_head splicing and dicing */ static struct journal_head *journal_alloc_journal_head(void) { struct journal_head *ret; |
470decc61 [PATCH] jbd2: ini... |
2031 |
|
e23291b91 jbd2: Fix CONFIG_... |
2032 |
#ifdef CONFIG_JBD2_DEBUG |
470decc61 [PATCH] jbd2: ini... |
2033 2034 |
atomic_inc(&nr_journal_heads); #endif |
f7f4bccb7 [PATCH] jbd2: ren... |
2035 |
ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); |
1076d17ac jbd/jbd2 NULL noise |
2036 |
if (!ret) { |
470decc61 [PATCH] jbd2: ini... |
2037 2038 |
jbd_debug(1, "out of memory for journal_head "); |
670be5a78 jbd2: Use pr_noti... |
2039 2040 |
pr_notice_ratelimited("ENOMEM in %s, retrying. ", __func__); |
1076d17ac jbd/jbd2 NULL noise |
2041 |
while (!ret) { |
470decc61 [PATCH] jbd2: ini... |
2042 |
yield(); |
f7f4bccb7 [PATCH] jbd2: ren... |
2043 |
ret = kmem_cache_alloc(jbd2_journal_head_cache, GFP_NOFS); |
470decc61 [PATCH] jbd2: ini... |
2044 2045 2046 2047 2048 2049 2050 |
} } return ret; } static void journal_free_journal_head(struct journal_head *jh) { |
e23291b91 jbd2: Fix CONFIG_... |
2051 |
#ifdef CONFIG_JBD2_DEBUG |
470decc61 [PATCH] jbd2: ini... |
2052 |
atomic_dec(&nr_journal_heads); |
cd02ff0b1 jbd2: JBD_XXX to ... |
2053 |
memset(jh, JBD2_POISON_FREE, sizeof(*jh)); |
470decc61 [PATCH] jbd2: ini... |
2054 |
#endif |
f7f4bccb7 [PATCH] jbd2: ren... |
2055 |
kmem_cache_free(jbd2_journal_head_cache, jh); |
470decc61 [PATCH] jbd2: ini... |
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 |
} /* * A journal_head is attached to a buffer_head whenever JBD has an * interest in the buffer. * * Whenever a buffer has an attached journal_head, its ->b_state:BH_JBD bit * is set. This bit is tested in core kernel code where we need to take * JBD-specific actions. Testing the zeroness of ->b_private is not reliable * there. * * When a buffer has its BH_JBD bit set, its ->b_count is elevated by one. * * When a buffer has its BH_JBD bit set it is immune from being released by * core kernel code, mainly via ->b_count. * |
de1b79413 jbd2: Fix oops in... |
2072 2073 2074 |
* A journal_head is detached from its buffer_head when the journal_head's * b_jcount reaches zero. Running transaction (b_transaction) and checkpoint * transaction (b_cp_transaction) hold their references to b_jcount. |
470decc61 [PATCH] jbd2: ini... |
2075 2076 2077 |
* * Various places in the kernel want to attach a journal_head to a buffer_head * _before_ attaching the journal_head to a transaction. To protect the |
f7f4bccb7 [PATCH] jbd2: ren... |
2078 |
* journal_head in this situation, jbd2_journal_add_journal_head elevates the |
470decc61 [PATCH] jbd2: ini... |
2079 |
* journal_head's b_jcount refcount by one. The caller must call |
f7f4bccb7 [PATCH] jbd2: ren... |
2080 |
* jbd2_journal_put_journal_head() to undo this. |
470decc61 [PATCH] jbd2: ini... |
2081 2082 2083 2084 |
* * So the typical usage would be: * * (Attach a journal_head if needed. Increments b_jcount) |
f7f4bccb7 [PATCH] jbd2: ren... |
2085 |
* struct journal_head *jh = jbd2_journal_add_journal_head(bh); |
470decc61 [PATCH] jbd2: ini... |
2086 |
* ... |
de1b79413 jbd2: Fix oops in... |
2087 2088 |
* (Get another reference for transaction) * jbd2_journal_grab_journal_head(bh); |
470decc61 [PATCH] jbd2: ini... |
2089 |
* jh->b_transaction = xxx; |
de1b79413 jbd2: Fix oops in... |
2090 |
* (Put original reference) |
f7f4bccb7 [PATCH] jbd2: ren... |
2091 |
* jbd2_journal_put_journal_head(jh); |
470decc61 [PATCH] jbd2: ini... |
2092 2093 2094 2095 2096 |
*/ /* * Give a buffer_head a journal_head. * |
470decc61 [PATCH] jbd2: ini... |
2097 2098 |
* May sleep. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
2099 |
struct journal_head *jbd2_journal_add_journal_head(struct buffer_head *bh) |
470decc61 [PATCH] jbd2: ini... |
2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 |
{ struct journal_head *jh; struct journal_head *new_jh = NULL; repeat: if (!buffer_jbd(bh)) { new_jh = journal_alloc_journal_head(); memset(new_jh, 0, sizeof(*new_jh)); } jbd_lock_bh_journal_head(bh); if (buffer_jbd(bh)) { jh = bh2jh(bh); } else { J_ASSERT_BH(bh, (atomic_read(&bh->b_count) > 0) || (bh->b_page && bh->b_page->mapping)); if (!new_jh) { jbd_unlock_bh_journal_head(bh); goto repeat; } jh = new_jh; new_jh = NULL; /* We consumed it */ set_buffer_jbd(bh); bh->b_private = jh; jh->b_bh = bh; get_bh(bh); BUFFER_TRACE(bh, "added journal_head"); } jh->b_jcount++; jbd_unlock_bh_journal_head(bh); if (new_jh) journal_free_journal_head(new_jh); return bh->b_private; } /* * Grab a ref against this buffer_head's journal_head. If it ended up not * having a journal_head, return NULL */ |
f7f4bccb7 [PATCH] jbd2: ren... |
2142 |
struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh) |
470decc61 [PATCH] jbd2: ini... |
2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 |
{ struct journal_head *jh = NULL; jbd_lock_bh_journal_head(bh); if (buffer_jbd(bh)) { jh = bh2jh(bh); jh->b_jcount++; } jbd_unlock_bh_journal_head(bh); return jh; } static void __journal_remove_journal_head(struct buffer_head *bh) { struct journal_head *jh = bh2jh(bh); J_ASSERT_JH(jh, jh->b_jcount >= 0); |
de1b79413 jbd2: Fix oops in... |
2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 |
J_ASSERT_JH(jh, jh->b_transaction == NULL); J_ASSERT_JH(jh, jh->b_next_transaction == NULL); J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); J_ASSERT_JH(jh, jh->b_jlist == BJ_None); J_ASSERT_BH(bh, buffer_jbd(bh)); J_ASSERT_BH(bh, jh2bh(jh) == bh); BUFFER_TRACE(bh, "remove journal_head"); if (jh->b_frozen_data) { printk(KERN_WARNING "%s: freeing b_frozen_data ", __func__); jbd2_free(jh->b_frozen_data, bh->b_size); |
470decc61 [PATCH] jbd2: ini... |
2171 |
} |
de1b79413 jbd2: Fix oops in... |
2172 2173 2174 2175 2176 2177 2178 2179 2180 |
if (jh->b_committed_data) { printk(KERN_WARNING "%s: freeing b_committed_data ", __func__); jbd2_free(jh->b_committed_data, bh->b_size); } bh->b_private = NULL; jh->b_bh = NULL; /* debug, really */ clear_buffer_jbd(bh); journal_free_journal_head(jh); |
470decc61 [PATCH] jbd2: ini... |
2181 2182 2183 |
} /* |
de1b79413 jbd2: Fix oops in... |
2184 |
* Drop a reference on the passed journal_head. If it fell to zero then |
470decc61 [PATCH] jbd2: ini... |
2185 2186 |
* release the journal_head from the buffer_head. */ |
f7f4bccb7 [PATCH] jbd2: ren... |
2187 |
void jbd2_journal_put_journal_head(struct journal_head *jh) |
470decc61 [PATCH] jbd2: ini... |
2188 2189 2190 2191 2192 2193 |
{ struct buffer_head *bh = jh2bh(jh); jbd_lock_bh_journal_head(bh); J_ASSERT_JH(jh, jh->b_jcount > 0); --jh->b_jcount; |
de1b79413 jbd2: Fix oops in... |
2194 |
if (!jh->b_jcount) { |
470decc61 [PATCH] jbd2: ini... |
2195 |
__journal_remove_journal_head(bh); |
de1b79413 jbd2: Fix oops in... |
2196 |
jbd_unlock_bh_journal_head(bh); |
470decc61 [PATCH] jbd2: ini... |
2197 |
__brelse(bh); |
de1b79413 jbd2: Fix oops in... |
2198 2199 |
} else jbd_unlock_bh_journal_head(bh); |
470decc61 [PATCH] jbd2: ini... |
2200 2201 2202 |
} /* |
c851ed540 jbd2: Implement d... |
2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 |
* Initialize jbd inode head */ void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode) { jinode->i_transaction = NULL; jinode->i_next_transaction = NULL; jinode->i_vfs_inode = inode; jinode->i_flags = 0; INIT_LIST_HEAD(&jinode->i_list); } /* * Function to be called before we start removing inode from memory (i.e., * clear_inode() is a fine place to be called from). It removes inode from * transaction's lists. */ void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode) { |
c851ed540 jbd2: Implement d... |
2222 2223 2224 2225 2226 |
if (!journal) return; restart: spin_lock(&journal->j_list_lock); /* Is commit writing out inode - we have to wait */ |
39e3ac259 jbd2: Fix I/O han... |
2227 |
if (test_bit(__JI_COMMIT_RUNNING, &jinode->i_flags)) { |
c851ed540 jbd2: Implement d... |
2228 2229 2230 2231 2232 2233 2234 2235 2236 |
wait_queue_head_t *wq; DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING); wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING); prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); spin_unlock(&journal->j_list_lock); schedule(); finish_wait(wq, &wait.wait); goto restart; } |
c851ed540 jbd2: Implement d... |
2237 2238 2239 2240 2241 2242 2243 2244 |
if (jinode->i_transaction) { list_del(&jinode->i_list); jinode->i_transaction = NULL; } spin_unlock(&journal->j_list_lock); } /* |
0f49d5d01 jbd2: Move jbd2-d... |
2245 |
* debugfs tunables |
470decc61 [PATCH] jbd2: ini... |
2246 |
*/ |
6f38c74f5 JBD2: debug code ... |
2247 2248 |
#ifdef CONFIG_JBD2_DEBUG u8 jbd2_journal_enable_debug __read_mostly; |
f7f4bccb7 [PATCH] jbd2: ren... |
2249 |
EXPORT_SYMBOL(jbd2_journal_enable_debug); |
470decc61 [PATCH] jbd2: ini... |
2250 |
|
0f49d5d01 jbd2: Move jbd2-d... |
2251 |
#define JBD2_DEBUG_NAME "jbd2-debug" |
470decc61 [PATCH] jbd2: ini... |
2252 |
|
6f38c74f5 JBD2: debug code ... |
2253 2254 |
static struct dentry *jbd2_debugfs_dir; static struct dentry *jbd2_debug; |
470decc61 [PATCH] jbd2: ini... |
2255 |
|
0f49d5d01 jbd2: Move jbd2-d... |
2256 2257 2258 2259 |
static void __init jbd2_create_debugfs_entry(void) { jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL); if (jbd2_debugfs_dir) |
765f83619 jbd: jbd-debug an... |
2260 2261 |
jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, S_IRUGO | S_IWUSR, |
0f49d5d01 jbd2: Move jbd2-d... |
2262 2263 |
jbd2_debugfs_dir, &jbd2_journal_enable_debug); |
470decc61 [PATCH] jbd2: ini... |
2264 |
} |
0f49d5d01 jbd2: Move jbd2-d... |
2265 |
static void __exit jbd2_remove_debugfs_entry(void) |
470decc61 [PATCH] jbd2: ini... |
2266 |
{ |
6f38c74f5 JBD2: debug code ... |
2267 2268 |
debugfs_remove(jbd2_debug); debugfs_remove(jbd2_debugfs_dir); |
470decc61 [PATCH] jbd2: ini... |
2269 |
} |
0f49d5d01 jbd2: Move jbd2-d... |
2270 |
#else |
470decc61 [PATCH] jbd2: ini... |
2271 |
|
0f49d5d01 jbd2: Move jbd2-d... |
2272 |
static void __init jbd2_create_debugfs_entry(void) |
470decc61 [PATCH] jbd2: ini... |
2273 |
{ |
470decc61 [PATCH] jbd2: ini... |
2274 |
} |
0f49d5d01 jbd2: Move jbd2-d... |
2275 |
static void __exit jbd2_remove_debugfs_entry(void) |
470decc61 [PATCH] jbd2: ini... |
2276 |
{ |
470decc61 [PATCH] jbd2: ini... |
2277 |
} |
470decc61 [PATCH] jbd2: ini... |
2278 |
#endif |
8e85fb3f3 jbd2: jbd2 stats ... |
2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 |
#ifdef CONFIG_PROC_FS #define JBD2_STATS_PROC_NAME "fs/jbd2" static void __init jbd2_create_jbd_stats_proc_entry(void) { proc_jbd2_stats = proc_mkdir(JBD2_STATS_PROC_NAME, NULL); } static void __exit jbd2_remove_jbd_stats_proc_entry(void) { if (proc_jbd2_stats) remove_proc_entry(JBD2_STATS_PROC_NAME, NULL); } #else #define jbd2_create_jbd_stats_proc_entry() do {} while (0) #define jbd2_remove_jbd_stats_proc_entry() do {} while (0) #endif |
8aefcd557 ext4: dynamically... |
2300 |
struct kmem_cache *jbd2_handle_cache, *jbd2_inode_cache; |
470decc61 [PATCH] jbd2: ini... |
2301 2302 2303 |
static int __init journal_init_handle_cache(void) { |
8aefcd557 ext4: dynamically... |
2304 |
jbd2_handle_cache = KMEM_CACHE(jbd2_journal_handle, SLAB_TEMPORARY); |
f7f4bccb7 [PATCH] jbd2: ren... |
2305 |
if (jbd2_handle_cache == NULL) { |
8aefcd557 ext4: dynamically... |
2306 2307 2308 2309 2310 2311 2312 2313 2314 |
printk(KERN_EMERG "JBD2: failed to create handle cache "); return -ENOMEM; } jbd2_inode_cache = KMEM_CACHE(jbd2_inode, 0); if (jbd2_inode_cache == NULL) { printk(KERN_EMERG "JBD2: failed to create inode cache "); kmem_cache_destroy(jbd2_handle_cache); |
470decc61 [PATCH] jbd2: ini... |
2315 2316 2317 2318 |
return -ENOMEM; } return 0; } |
f7f4bccb7 [PATCH] jbd2: ren... |
2319 |
static void jbd2_journal_destroy_handle_cache(void) |
470decc61 [PATCH] jbd2: ini... |
2320 |
{ |
f7f4bccb7 [PATCH] jbd2: ren... |
2321 2322 |
if (jbd2_handle_cache) kmem_cache_destroy(jbd2_handle_cache); |
8aefcd557 ext4: dynamically... |
2323 2324 |
if (jbd2_inode_cache) kmem_cache_destroy(jbd2_inode_cache); |
470decc61 [PATCH] jbd2: ini... |
2325 2326 2327 2328 2329 2330 2331 2332 2333 |
} /* * Module startup and shutdown */ static int __init journal_init_caches(void) { int ret; |
f7f4bccb7 [PATCH] jbd2: ren... |
2334 |
ret = jbd2_journal_init_revoke_caches(); |
470decc61 [PATCH] jbd2: ini... |
2335 |
if (ret == 0) |
f7f4bccb7 [PATCH] jbd2: ren... |
2336 |
ret = journal_init_jbd2_journal_head_cache(); |
470decc61 [PATCH] jbd2: ini... |
2337 2338 2339 2340 |
if (ret == 0) ret = journal_init_handle_cache(); return ret; } |
f7f4bccb7 [PATCH] jbd2: ren... |
2341 |
static void jbd2_journal_destroy_caches(void) |
470decc61 [PATCH] jbd2: ini... |
2342 |
{ |
f7f4bccb7 [PATCH] jbd2: ren... |
2343 2344 2345 |
jbd2_journal_destroy_revoke_caches(); jbd2_journal_destroy_jbd2_journal_head_cache(); jbd2_journal_destroy_handle_cache(); |
d2eecb039 ext4: Use slab al... |
2346 |
jbd2_journal_destroy_slabs(); |
470decc61 [PATCH] jbd2: ini... |
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} static int __init journal_init(void) { int ret; BUILD_BUG_ON(sizeof(struct journal_superblock_s) != 1024); ret = journal_init_caches(); |
620de4e19 jbd2: only create... |
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if (ret == 0) { jbd2_create_debugfs_entry(); jbd2_create_jbd_stats_proc_entry(); } else { |
f7f4bccb7 [PATCH] jbd2: ren... |
2360 |
jbd2_journal_destroy_caches(); |
620de4e19 jbd2: only create... |
2361 |
} |
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return ret; } static void __exit journal_exit(void) { |
e23291b91 jbd2: Fix CONFIG_... |
2367 |
#ifdef CONFIG_JBD2_DEBUG |
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int n = atomic_read(&nr_journal_heads); if (n) |
f2a44523b jbd2: Unify log m... |
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printk(KERN_EMERG "JBD2: leaked %d journal_heads! ", n); |
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2372 |
#endif |
0f49d5d01 jbd2: Move jbd2-d... |
2373 |
jbd2_remove_debugfs_entry(); |
8e85fb3f3 jbd2: jbd2 stats ... |
2374 |
jbd2_remove_jbd_stats_proc_entry(); |
f7f4bccb7 [PATCH] jbd2: ren... |
2375 |
jbd2_journal_destroy_caches(); |
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} MODULE_LICENSE("GPL"); module_init(journal_init); module_exit(journal_exit); |