| /* |
| * linux/fs/commit.c |
| * |
| * 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. |
| * |
| * Journal commit routines for the generic filesystem journaling code; |
| * part of the ext2fs journaling system. |
| */ |
| |
| #include <linux/time.h> |
| #include <linux/fs.h> |
| #include <linux/jbd.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/locks.h> |
| #include <linux/smp_lock.h> |
| |
| extern spinlock_t journal_datalist_lock; |
| |
| /* |
| * Default IO end handler for temporary BJ_IO buffer_heads. |
| */ |
| static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) |
| { |
| BUFFER_TRACE(bh, ""); |
| mark_buffer_uptodate(bh, uptodate); |
| unlock_buffer(bh); |
| } |
| |
| /* |
| * journal_commit_transaction |
| * |
| * The primary function for committing a transaction to the log. This |
| * function is called by the journal thread to begin a complete commit. |
| */ |
| void journal_commit_transaction(journal_t *journal) |
| { |
| transaction_t *commit_transaction; |
| struct journal_head *jh, *new_jh, *descriptor; |
| struct journal_head *next_jh, *last_jh; |
| struct buffer_head *wbuf[64]; |
| int bufs; |
| int flags; |
| int err; |
| unsigned long blocknr; |
| char *tagp = NULL; |
| journal_header_t *header; |
| journal_block_tag_t *tag = NULL; |
| int space_left = 0; |
| int first_tag = 0; |
| int tag_flag; |
| int i; |
| |
| /* |
| * First job: lock down the current transaction and wait for |
| * all outstanding updates to complete. |
| */ |
| |
| lock_journal(journal); /* Protect journal->j_running_transaction */ |
| |
| #ifdef COMMIT_STATS |
| spin_lock(&journal_datalist_lock); |
| summarise_journal_usage(journal); |
| spin_unlock(&journal_datalist_lock); |
| #endif |
| |
| lock_kernel(); |
| |
| J_ASSERT (journal->j_running_transaction != NULL); |
| J_ASSERT (journal->j_committing_transaction == NULL); |
| |
| commit_transaction = journal->j_running_transaction; |
| J_ASSERT (commit_transaction->t_state == T_RUNNING); |
| |
| jbd_debug (1, "JBD: starting commit of transaction %d\n", |
| commit_transaction->t_tid); |
| |
| commit_transaction->t_state = T_LOCKED; |
| while (commit_transaction->t_updates != 0) { |
| unlock_journal(journal); |
| sleep_on(&journal->j_wait_updates); |
| lock_journal(journal); |
| } |
| |
| J_ASSERT (commit_transaction->t_outstanding_credits <= |
| journal->j_max_transaction_buffers); |
| |
| /* Do we need to erase the effects of a prior journal_flush? */ |
| if (journal->j_flags & JFS_FLUSHED) { |
| jbd_debug(3, "super block updated\n"); |
| journal_update_superblock(journal, 1); |
| } else { |
| jbd_debug(3, "superblock not updated\n"); |
| } |
| |
| /* |
| * First thing we are allowed to do is to discard any remaining |
| * BJ_Reserved buffers. Note, it is _not_ permissible to assume |
| * that there are no such buffers: if a large filesystem |
| * operation like a truncate needs to split itself over multiple |
| * transactions, then it may try to do a journal_restart() while |
| * there are still BJ_Reserved buffers outstanding. These must |
| * be released cleanly from the current transaction. |
| * |
| * In this case, the filesystem must still reserve write access |
| * again before modifying the buffer in the new transaction, but |
| * we do not require it to remember exactly which old buffers it |
| * has reserved. This is consistent with the existing behaviour |
| * that multiple journal_get_write_access() calls to the same |
| * buffer are perfectly permissable. |
| */ |
| |
| while (commit_transaction->t_reserved_list) { |
| jh = commit_transaction->t_reserved_list; |
| JBUFFER_TRACE(jh, "reserved, unused: refile"); |
| journal_refile_buffer(jh); |
| } |
| |
| /* |
| * Now try to drop any written-back buffers from the journal's |
| * checkpoint lists. We do this *before* commit because it potentially |
| * frees some memory |
| */ |
| spin_lock(&journal_datalist_lock); |
| __journal_clean_checkpoint_list(journal); |
| spin_unlock(&journal_datalist_lock); |
| |
| /* First part of the commit: force the revoke list out to disk. |
| * The revoke code generates its own metadata blocks on disk for this. |
| * |
| * It is important that we do this while the transaction is |
| * still locked. Generating the revoke records should not |
| * generate any IO stalls, so this should be quick; and doing |
| * the work while we have the transaction locked means that we |
| * only ever have to maintain the revoke list for one |
| * transaction at a time. |
| */ |
| |
| jbd_debug (3, "JBD: commit phase 1\n"); |
| |
| journal_write_revoke_records(journal, commit_transaction); |
| |
| /* |
| * Now that we have built the revoke records, we can start |
| * reusing the revoke list for a new running transaction. We |
| * can now safely start committing the old transaction: time to |
| * get a new running transaction for incoming filesystem updates |
| */ |
| |
| commit_transaction->t_state = T_FLUSH; |
| |
| wake_up(&journal->j_wait_transaction_locked); |
| |
| journal->j_committing_transaction = commit_transaction; |
| journal->j_running_transaction = NULL; |
| |
| commit_transaction->t_log_start = journal->j_head; |
| |
| unlock_kernel(); |
| |
| jbd_debug (3, "JBD: commit phase 2\n"); |
| |
| /* |
| * Now start flushing things to disk, in the order they appear |
| * on the transaction lists. Data blocks go first. |
| */ |
| |
| /* |
| * Whenever we unlock the journal and sleep, things can get added |
| * onto ->t_datalist, so we have to keep looping back to write_out_data |
| * until we *know* that the list is empty. |
| */ |
| write_out_data: |
| |
| /* |
| * Cleanup any flushed data buffers from the data list. Even in |
| * abort mode, we want to flush this out as soon as possible. |
| * |
| * We take journal_datalist_lock to protect the lists from |
| * journal_try_to_free_buffers(). |
| */ |
| spin_lock(&journal_datalist_lock); |
| |
| write_out_data_locked: |
| bufs = 0; |
| next_jh = commit_transaction->t_sync_datalist; |
| if (next_jh == NULL) |
| goto sync_datalist_empty; |
| last_jh = next_jh->b_tprev; |
| |
| do { |
| struct buffer_head *bh; |
| |
| jh = next_jh; |
| next_jh = jh->b_tnext; |
| bh = jh2bh(jh); |
| if (!buffer_locked(bh)) { |
| if (buffer_dirty(bh)) { |
| BUFFER_TRACE(bh, "start journal writeout"); |
| atomic_inc(&bh->b_count); |
| wbuf[bufs++] = bh; |
| } else { |
| BUFFER_TRACE(bh, "writeout complete: unfile"); |
| __journal_unfile_buffer(jh); |
| jh->b_transaction = NULL; |
| __journal_remove_journal_head(bh); |
| refile_buffer(bh); |
| __brelse(bh); |
| } |
| } |
| if (bufs == ARRAY_SIZE(wbuf)) { |
| /* |
| * Major speedup: start here on the next scan |
| */ |
| J_ASSERT(commit_transaction->t_sync_datalist != 0); |
| commit_transaction->t_sync_datalist = jh; |
| break; |
| } |
| } while (jh != last_jh); |
| |
| if (bufs || need_resched()) { |
| jbd_debug(2, "submit %d writes\n", bufs); |
| spin_unlock(&journal_datalist_lock); |
| unlock_journal(journal); |
| if (bufs) |
| ll_rw_block(WRITE, bufs, wbuf); |
| cond_resched(); |
| journal_brelse_array(wbuf, bufs); |
| lock_journal(journal); |
| spin_lock(&journal_datalist_lock); |
| if (bufs) |
| goto write_out_data_locked; |
| } |
| |
| /* |
| * Wait for all previously submitted IO on the data list to complete. |
| */ |
| jh = commit_transaction->t_sync_datalist; |
| if (jh == NULL) |
| goto sync_datalist_empty; |
| |
| do { |
| struct buffer_head *bh; |
| jh = jh->b_tprev; /* Wait on the last written */ |
| bh = jh2bh(jh); |
| if (buffer_locked(bh)) { |
| spin_unlock(&journal_datalist_lock); |
| unlock_journal(journal); |
| wait_on_buffer(bh); |
| /* the journal_head may have been removed now */ |
| lock_journal(journal); |
| goto write_out_data; |
| } else if (buffer_dirty(bh)) { |
| goto write_out_data_locked; |
| } |
| } while (jh != commit_transaction->t_sync_datalist); |
| goto write_out_data_locked; |
| |
| sync_datalist_empty: |
| /* |
| * Wait for all the async writepage data. As they become unlocked |
| * in end_buffer_io_async(), the only place where they can be |
| * reaped is in try_to_free_buffers(), and we're locked against |
| * that. |
| */ |
| while ((jh = commit_transaction->t_async_datalist)) { |
| struct buffer_head *bh = jh2bh(jh); |
| if (buffer_locked(bh)) { |
| spin_unlock(&journal_datalist_lock); |
| unlock_journal(journal); |
| wait_on_buffer(bh); |
| lock_journal(journal); |
| spin_lock(&journal_datalist_lock); |
| continue; /* List may have changed */ |
| } |
| if (jh->b_next_transaction) { |
| /* |
| * For writepage() buffers in journalled data mode: a |
| * later transaction may want the buffer for "metadata" |
| */ |
| __journal_refile_buffer(jh); |
| } else { |
| BUFFER_TRACE(bh, "finished async writeout: unfile"); |
| __journal_unfile_buffer(jh); |
| jh->b_transaction = NULL; |
| __journal_remove_journal_head(bh); |
| BUFFER_TRACE(bh, "finished async writeout: refile"); |
| /* It can sometimes be on BUF_LOCKED due to migration |
| * from syncdata to asyncdata */ |
| if (bh->b_list != BUF_CLEAN) |
| refile_buffer(bh); |
| __brelse(bh); |
| } |
| } |
| spin_unlock(&journal_datalist_lock); |
| |
| /* |
| * If we found any dirty or locked buffers, then we should have |
| * looped back up to the write_out_data label. If there weren't |
| * any then journal_clean_data_list should have wiped the list |
| * clean by now, so check that it is in fact empty. |
| */ |
| J_ASSERT (commit_transaction->t_sync_datalist == NULL); |
| J_ASSERT (commit_transaction->t_async_datalist == NULL); |
| |
| jbd_debug (3, "JBD: commit phase 3\n"); |
| |
| /* |
| * Way to go: we have now written out all of the data for a |
| * transaction! Now comes the tricky part: we need to write out |
| * metadata. Loop over the transaction's entire buffer list: |
| */ |
| commit_transaction->t_state = T_COMMIT; |
| |
| descriptor = 0; |
| bufs = 0; |
| while (commit_transaction->t_buffers) { |
| |
| /* Find the next buffer to be journaled... */ |
| |
| jh = commit_transaction->t_buffers; |
| |
| /* If we're in abort mode, we just un-journal the buffer and |
| release it for background writing. */ |
| |
| if (is_journal_aborted(journal)) { |
| JBUFFER_TRACE(jh, "journal is aborting: refile"); |
| journal_refile_buffer(jh); |
| /* If that was the last one, we need to clean up |
| * any descriptor buffers which may have been |
| * already allocated, even if we are now |
| * aborting. */ |
| if (!commit_transaction->t_buffers) |
| goto start_journal_io; |
| continue; |
| } |
| |
| /* Make sure we have a descriptor block in which to |
| record the metadata buffer. */ |
| |
| if (!descriptor) { |
| struct buffer_head *bh; |
| |
| J_ASSERT (bufs == 0); |
| |
| jbd_debug(4, "JBD: get descriptor\n"); |
| |
| descriptor = journal_get_descriptor_buffer(journal); |
| if (!descriptor) { |
| __journal_abort_hard(journal); |
| continue; |
| } |
| |
| bh = jh2bh(descriptor); |
| jbd_debug(4, "JBD: got buffer %ld (%p)\n", |
| bh->b_blocknr, bh->b_data); |
| header = (journal_header_t *)&bh->b_data[0]; |
| header->h_magic = htonl(JFS_MAGIC_NUMBER); |
| header->h_blocktype = htonl(JFS_DESCRIPTOR_BLOCK); |
| header->h_sequence = htonl(commit_transaction->t_tid); |
| |
| tagp = &bh->b_data[sizeof(journal_header_t)]; |
| space_left = bh->b_size - sizeof(journal_header_t); |
| first_tag = 1; |
| set_bit(BH_JWrite, &bh->b_state); |
| wbuf[bufs++] = bh; |
| |
| /* Record it so that we can wait for IO |
| completion later */ |
| BUFFER_TRACE(bh, "ph3: file as descriptor"); |
| journal_file_buffer(descriptor, commit_transaction, |
| BJ_LogCtl); |
| } |
| |
| /* Where is the buffer to be written? */ |
| |
| err = journal_next_log_block(journal, &blocknr); |
| /* If the block mapping failed, just abandon the buffer |
| and repeat this loop: we'll fall into the |
| refile-on-abort condition above. */ |
| if (err) { |
| __journal_abort_hard(journal); |
| continue; |
| } |
| |
| /* Bump b_count to prevent truncate from stumbling over |
| the shadowed buffer! @@@ This can go if we ever get |
| rid of the BJ_IO/BJ_Shadow pairing of buffers. */ |
| atomic_inc(&jh2bh(jh)->b_count); |
| |
| /* Make a temporary IO buffer with which to write it out |
| (this will requeue both the metadata buffer and the |
| temporary IO buffer). new_bh goes on BJ_IO*/ |
| |
| set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
| /* |
| * akpm: journal_write_metadata_buffer() sets |
| * new_bh->b_transaction to commit_transaction. |
| * We need to clean this up before we release new_bh |
| * (which is of type BJ_IO) |
| */ |
| JBUFFER_TRACE(jh, "ph3: write metadata"); |
| flags = journal_write_metadata_buffer(commit_transaction, |
| jh, &new_jh, blocknr); |
| set_bit(BH_JWrite, &jh2bh(new_jh)->b_state); |
| wbuf[bufs++] = jh2bh(new_jh); |
| |
| /* Record the new block's tag in the current descriptor |
| buffer */ |
| |
| tag_flag = 0; |
| if (flags & 1) |
| tag_flag |= JFS_FLAG_ESCAPE; |
| if (!first_tag) |
| tag_flag |= JFS_FLAG_SAME_UUID; |
| |
| tag = (journal_block_tag_t *) tagp; |
| tag->t_blocknr = htonl(jh2bh(jh)->b_blocknr); |
| tag->t_flags = htonl(tag_flag); |
| tagp += sizeof(journal_block_tag_t); |
| space_left -= sizeof(journal_block_tag_t); |
| |
| if (first_tag) { |
| memcpy (tagp, journal->j_uuid, 16); |
| tagp += 16; |
| space_left -= 16; |
| first_tag = 0; |
| } |
| |
| /* If there's no more to do, or if the descriptor is full, |
| let the IO rip! */ |
| |
| if (bufs == ARRAY_SIZE(wbuf) || |
| commit_transaction->t_buffers == NULL || |
| space_left < sizeof(journal_block_tag_t) + 16) { |
| |
| jbd_debug(4, "JBD: Submit %d IOs\n", bufs); |
| |
| /* Write an end-of-descriptor marker before |
| submitting the IOs. "tag" still points to |
| the last tag we set up. */ |
| |
| tag->t_flags |= htonl(JFS_FLAG_LAST_TAG); |
| |
| start_journal_io: |
| unlock_journal(journal); |
| for (i=0; i<bufs; i++) { |
| struct buffer_head *bh = wbuf[i]; |
| set_bit(BH_Lock, &bh->b_state); |
| clear_bit(BH_Dirty, &bh->b_state); |
| bh->b_end_io = journal_end_buffer_io_sync; |
| submit_bh(WRITE, bh); |
| } |
| cond_resched(); |
| lock_journal(journal); |
| |
| /* Force a new descriptor to be generated next |
| time round the loop. */ |
| descriptor = NULL; |
| bufs = 0; |
| } |
| } |
| |
| /* Lo and behold: we have just managed to send a transaction to |
| the log. Before we can commit it, wait for the IO so far to |
| complete. Control buffers being written are on the |
| transaction's t_log_list queue, and metadata buffers are on |
| the t_iobuf_list queue. |
| |
| Wait for the transactions in reverse order. That way we are |
| less likely to be woken up until all IOs have completed, and |
| so we incur less scheduling load. |
| */ |
| |
| jbd_debug(3, "JBD: commit phase 4\n"); |
| |
| /* akpm: these are BJ_IO, and journal_datalist_lock is not needed */ |
| wait_for_iobuf: |
| while (commit_transaction->t_iobuf_list != NULL) { |
| struct buffer_head *bh; |
| jh = commit_transaction->t_iobuf_list->b_tprev; |
| bh = jh2bh(jh); |
| if (buffer_locked(bh)) { |
| unlock_journal(journal); |
| wait_on_buffer(bh); |
| lock_journal(journal); |
| goto wait_for_iobuf; |
| } |
| |
| clear_bit(BH_JWrite, &jh2bh(jh)->b_state); |
| |
| JBUFFER_TRACE(jh, "ph4: unfile after journal write"); |
| journal_unfile_buffer(jh); |
| |
| /* |
| * akpm: don't put back a buffer_head with stale pointers |
| * dangling around. |
| */ |
| J_ASSERT_JH(jh, jh->b_transaction != NULL); |
| jh->b_transaction = NULL; |
| |
| /* |
| * ->t_iobuf_list should contain only dummy buffer_heads |
| * which were created by journal_write_metadata_buffer(). |
| */ |
| bh = jh2bh(jh); |
| BUFFER_TRACE(bh, "dumping temporary bh"); |
| journal_unlock_journal_head(jh); |
| __brelse(bh); |
| J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); |
| put_unused_buffer_head(bh); |
| |
| /* We also have to unlock and free the corresponding |
| shadowed buffer */ |
| jh = commit_transaction->t_shadow_list->b_tprev; |
| bh = jh2bh(jh); |
| clear_bit(BH_JWrite, &bh->b_state); |
| J_ASSERT_BH(bh, buffer_jdirty(bh)); |
| |
| /* The metadata is now released for reuse, but we need |
| to remember it against this transaction so that when |
| we finally commit, we can do any checkpointing |
| required. */ |
| JBUFFER_TRACE(jh, "file as BJ_Forget"); |
| journal_file_buffer(jh, commit_transaction, BJ_Forget); |
| /* Wake up any transactions which were waiting for this |
| IO to complete */ |
| wake_up(&bh->b_wait); |
| JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
| __brelse(bh); |
| } |
| |
| J_ASSERT (commit_transaction->t_shadow_list == NULL); |
| |
| jbd_debug(3, "JBD: commit phase 5\n"); |
| |
| /* Here we wait for the revoke record and descriptor record buffers */ |
| wait_for_ctlbuf: |
| while (commit_transaction->t_log_list != NULL) { |
| struct buffer_head *bh; |
| |
| jh = commit_transaction->t_log_list->b_tprev; |
| bh = jh2bh(jh); |
| if (buffer_locked(bh)) { |
| unlock_journal(journal); |
| wait_on_buffer(bh); |
| lock_journal(journal); |
| goto wait_for_ctlbuf; |
| } |
| |
| BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); |
| clear_bit(BH_JWrite, &bh->b_state); |
| journal_unfile_buffer(jh); |
| jh->b_transaction = NULL; |
| journal_unlock_journal_head(jh); |
| __brelse(bh); /* One for getblk */ |
| /* AKPM: bforget here */ |
| } |
| |
| jbd_debug(3, "JBD: commit phase 6\n"); |
| |
| if (is_journal_aborted(journal)) |
| goto skip_commit; |
| |
| /* Done it all: now write the commit record. We should have |
| * cleaned up our previous buffers by now, so if we are in abort |
| * mode we can now just skip the rest of the journal write |
| * entirely. */ |
| |
| descriptor = journal_get_descriptor_buffer(journal); |
| if (!descriptor) { |
| __journal_abort_hard(journal); |
| goto skip_commit; |
| } |
| |
| /* AKPM: buglet - add `i' to tmp! */ |
| for (i = 0; i < jh2bh(descriptor)->b_size; i += 512) { |
| journal_header_t *tmp = |
| (journal_header_t*)jh2bh(descriptor)->b_data; |
| tmp->h_magic = htonl(JFS_MAGIC_NUMBER); |
| tmp->h_blocktype = htonl(JFS_COMMIT_BLOCK); |
| tmp->h_sequence = htonl(commit_transaction->t_tid); |
| } |
| |
| unlock_journal(journal); |
| JBUFFER_TRACE(descriptor, "write commit block"); |
| { |
| struct buffer_head *bh = jh2bh(descriptor); |
| ll_rw_block(WRITE, 1, &bh); |
| wait_on_buffer(bh); |
| __brelse(bh); /* One for getblk() */ |
| journal_unlock_journal_head(descriptor); |
| } |
| lock_journal(journal); |
| |
| /* End of a transaction! Finally, we can do checkpoint |
| processing: any buffers committed as a result of this |
| transaction can be removed from any checkpoint list it was on |
| before. */ |
| |
| skip_commit: |
| |
| jbd_debug(3, "JBD: commit phase 7\n"); |
| |
| J_ASSERT(commit_transaction->t_sync_datalist == NULL); |
| J_ASSERT(commit_transaction->t_async_datalist == NULL); |
| J_ASSERT(commit_transaction->t_buffers == NULL); |
| J_ASSERT(commit_transaction->t_checkpoint_list == NULL); |
| J_ASSERT(commit_transaction->t_iobuf_list == NULL); |
| J_ASSERT(commit_transaction->t_shadow_list == NULL); |
| J_ASSERT(commit_transaction->t_log_list == NULL); |
| |
| while (commit_transaction->t_forget) { |
| transaction_t *cp_transaction; |
| struct buffer_head *bh; |
| |
| jh = commit_transaction->t_forget; |
| J_ASSERT_JH(jh, jh->b_transaction == commit_transaction || |
| jh->b_transaction == journal->j_running_transaction); |
| |
| /* |
| * If there is undo-protected committed data against |
| * this buffer, then we can remove it now. If it is a |
| * buffer needing such protection, the old frozen_data |
| * field now points to a committed version of the |
| * buffer, so rotate that field to the new committed |
| * data. |
| * |
| * Otherwise, we can just throw away the frozen data now. |
| */ |
| if (jh->b_committed_data) { |
| kfree(jh->b_committed_data); |
| jh->b_committed_data = NULL; |
| if (jh->b_frozen_data) { |
| jh->b_committed_data = jh->b_frozen_data; |
| jh->b_frozen_data = NULL; |
| } |
| } else if (jh->b_frozen_data) { |
| kfree(jh->b_frozen_data); |
| jh->b_frozen_data = NULL; |
| } |
| |
| spin_lock(&journal_datalist_lock); |
| cp_transaction = jh->b_cp_transaction; |
| if (cp_transaction) { |
| JBUFFER_TRACE(jh, "remove from old cp transaction"); |
| J_ASSERT_JH(jh, commit_transaction != cp_transaction); |
| __journal_remove_checkpoint(jh); |
| } |
| |
| /* Only re-checkpoint the buffer_head if it is marked |
| * dirty. If the buffer was added to the BJ_Forget list |
| * by journal_forget, it may no longer be dirty and |
| * there's no point in keeping a checkpoint record for |
| * it. */ |
| bh = jh2bh(jh); |
| if (buffer_jdirty(bh)) { |
| JBUFFER_TRACE(jh, "add to new checkpointing trans"); |
| __journal_insert_checkpoint(jh, commit_transaction); |
| JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
| __journal_refile_buffer(jh); |
| } else { |
| J_ASSERT_BH(bh, !buffer_dirty(bh)); |
| J_ASSERT_JH(jh, jh->b_next_transaction == NULL); |
| __journal_unfile_buffer(jh); |
| jh->b_transaction = 0; |
| __journal_remove_journal_head(bh); |
| __brelse(bh); |
| } |
| spin_unlock(&journal_datalist_lock); |
| } |
| |
| /* Done with this transaction! */ |
| |
| jbd_debug(3, "JBD: commit phase 8\n"); |
| |
| J_ASSERT (commit_transaction->t_state == T_COMMIT); |
| commit_transaction->t_state = T_FINISHED; |
| |
| J_ASSERT (commit_transaction == journal->j_committing_transaction); |
| journal->j_commit_sequence = commit_transaction->t_tid; |
| journal->j_committing_transaction = NULL; |
| |
| spin_lock(&journal_datalist_lock); |
| if (commit_transaction->t_checkpoint_list == NULL) { |
| __journal_drop_transaction(journal, commit_transaction); |
| } else { |
| if (journal->j_checkpoint_transactions == NULL) { |
| journal->j_checkpoint_transactions = commit_transaction; |
| commit_transaction->t_cpnext = commit_transaction; |
| commit_transaction->t_cpprev = commit_transaction; |
| } else { |
| commit_transaction->t_cpnext = |
| journal->j_checkpoint_transactions; |
| commit_transaction->t_cpprev = |
| commit_transaction->t_cpnext->t_cpprev; |
| commit_transaction->t_cpnext->t_cpprev = |
| commit_transaction; |
| commit_transaction->t_cpprev->t_cpnext = |
| commit_transaction; |
| } |
| } |
| spin_unlock(&journal_datalist_lock); |
| |
| jbd_debug(1, "JBD: commit %d complete, head %d\n", |
| journal->j_commit_sequence, journal->j_tail_sequence); |
| |
| unlock_journal(journal); |
| wake_up(&journal->j_wait_done_commit); |
| } |