コード例 #1
0
int journal_forget (handle_t *handle, struct buffer_head *bh)
{
	transaction_t *transaction = handle->h_transaction;
	journal_t *journal = transaction->t_journal;
	struct journal_head *jh;
	int drop_reserve = 0;
	int err = 0;
	int was_modified = 0;

	BUFFER_TRACE(bh, "entry");

	jbd_lock_bh_state(bh);
	spin_lock(&journal->j_list_lock);

	if (!buffer_jbd(bh))
		goto not_jbd;
	jh = bh2jh(bh);

	/* Critical error: attempting to delete a bitmap buffer, maybe?
	 * Don't do any jbd operations, and return an error. */
	if (!J_EXPECT_JH(jh, !jh->b_committed_data,
			 "inconsistent data on disk")) {
		err = -EIO;
		goto not_jbd;
	}

	/* keep track of wether or not this transaction modified us */
	was_modified = jh->b_modified;

	/*
	 * The buffer's going from the transaction, we must drop
	 * all references -bzzz
	 */
	jh->b_modified = 0;

	if (jh->b_transaction == handle->h_transaction) {
		J_ASSERT_JH(jh, !jh->b_frozen_data);

		/* If we are forgetting a buffer which is already part
		 * of this transaction, then we can just drop it from
		 * the transaction immediately. */
		clear_buffer_dirty(bh);
		clear_buffer_jbddirty(bh);

		JBUFFER_TRACE(jh, "belongs to current transaction: unfile");

		/*
		 * we only want to drop a reference if this transaction
		 * modified the buffer
		 */
		if (was_modified)
			drop_reserve = 1;

		/*
		 * We are no longer going to journal this buffer.
		 * However, the commit of this transaction is still
		 * important to the buffer: the delete that we are now
		 * processing might obsolete an old log entry, so by
		 * committing, we can satisfy the buffer's checkpoint.
		 *
		 * So, if we have a checkpoint on the buffer, we should
		 * now refile the buffer on our BJ_Forget list so that
		 * we know to remove the checkpoint after we commit.
		 */

		if (jh->b_cp_transaction) {
			__journal_temp_unlink_buffer(jh);
			__journal_file_buffer(jh, transaction, BJ_Forget);
		} else {
			__journal_unfile_buffer(jh);
			journal_remove_journal_head(bh);
			__brelse(bh);
			if (!buffer_jbd(bh)) {
				spin_unlock(&journal->j_list_lock);
				jbd_unlock_bh_state(bh);
				__bforget(bh);
				goto drop;
			}
		}
	} else if (jh->b_transaction) {
		J_ASSERT_JH(jh, (jh->b_transaction ==
				 journal->j_committing_transaction));
		/* However, if the buffer is still owned by a prior
		 * (committing) transaction, we can't drop it yet... */
		JBUFFER_TRACE(jh, "belongs to older transaction");
		/* ... but we CAN drop it from the new transaction if we
		 * have also modified it since the original commit. */

		if (jh->b_next_transaction) {
			J_ASSERT(jh->b_next_transaction == transaction);
			jh->b_next_transaction = NULL;

			/*
			 * only drop a reference if this transaction modified
			 * the buffer
			 */
			if (was_modified)
				drop_reserve = 1;
		}
	}

not_jbd:
	spin_unlock(&journal->j_list_lock);
	jbd_unlock_bh_state(bh);
	__brelse(bh);
drop:
	if (drop_reserve) {
		/* no need to reserve log space for this block -bzzz */
		handle->h_buffer_credits++;
	}
	return err;
}
コード例 #2
0
ファイル: revoke.c プロジェクト: AlexShiLucky/linux
static void write_one_revoke_record(transaction_t *transaction,
				    struct list_head *log_bufs,
				    struct buffer_head **descriptorp,
				    int *offsetp,
				    struct jbd2_revoke_record_s *record)
{
	journal_t *journal = transaction->t_journal;
	int csum_size = 0;
	struct buffer_head *descriptor;
	int sz, offset;

	/* If we are already aborting, this all becomes a noop.  We
           still need to go round the loop in
           jbd2_journal_write_revoke_records in order to free all of the
           revoke records: only the IO to the journal is omitted. */
	if (is_journal_aborted(journal))
		return;

	descriptor = *descriptorp;
	offset = *offsetp;

	/* Do we need to leave space at the end for a checksum? */
	if (jbd2_journal_has_csum_v2or3(journal))
		csum_size = sizeof(struct jbd2_journal_block_tail);

	if (jbd2_has_feature_64bit(journal))
		sz = 8;
	else
		sz = 4;

	/* Make sure we have a descriptor with space left for the record */
	if (descriptor) {
		if (offset + sz > journal->j_blocksize - csum_size) {
			flush_descriptor(journal, descriptor, offset);
			descriptor = NULL;
		}
	}

	if (!descriptor) {
		descriptor = jbd2_journal_get_descriptor_buffer(transaction,
							JBD2_REVOKE_BLOCK);
		if (!descriptor)
			return;

		/* Record it so that we can wait for IO completion later */
		BUFFER_TRACE(descriptor, "file in log_bufs");
		jbd2_file_log_bh(log_bufs, descriptor);

		offset = sizeof(jbd2_journal_revoke_header_t);
		*descriptorp = descriptor;
	}

	if (jbd2_has_feature_64bit(journal))
		* ((__be64 *)(&descriptor->b_data[offset])) =
			cpu_to_be64(record->blocknr);
	else
		* ((__be32 *)(&descriptor->b_data[offset])) =
			cpu_to_be32(record->blocknr);
	offset += sz;

	*offsetp = offset;
}
コード例 #3
0
ファイル: checkpoint.c プロジェクト: 020gzh/linux
/*
 * Perform an actual checkpoint. We take the first transaction on the
 * list of transactions to be checkpointed and send all its buffers
 * to disk. We submit larger chunks of data at once.
 *
 * The journal should be locked before calling this function.
 * Called with j_checkpoint_mutex held.
 */
int jbd2_log_do_checkpoint(journal_t *journal)
{
	struct journal_head	*jh;
	struct buffer_head	*bh;
	transaction_t		*transaction;
	tid_t			this_tid;
	int			result, batch_count = 0;

	jbd_debug(1, "Start checkpoint\n");

	/*
	 * First thing: if there are any transactions in the log which
	 * don't need checkpointing, just eliminate them from the
	 * journal straight away.
	 */
	result = jbd2_cleanup_journal_tail(journal);
	trace_jbd2_checkpoint(journal, result);
	jbd_debug(1, "cleanup_journal_tail returned %d\n", result);
	if (result <= 0)
		return result;

	/*
	 * OK, we need to start writing disk blocks.  Take one transaction
	 * and write it.
	 */
	result = 0;
	spin_lock(&journal->j_list_lock);
	if (!journal->j_checkpoint_transactions)
		goto out;
	transaction = journal->j_checkpoint_transactions;
	if (transaction->t_chp_stats.cs_chp_time == 0)
		transaction->t_chp_stats.cs_chp_time = jiffies;
	this_tid = transaction->t_tid;
restart:
	/*
	 * If someone cleaned up this transaction while we slept, we're
	 * done (maybe it's a new transaction, but it fell at the same
	 * address).
	 */
	if (journal->j_checkpoint_transactions != transaction ||
	    transaction->t_tid != this_tid)
		goto out;

	/* checkpoint all of the transaction's buffers */
	while (transaction->t_checkpoint_list) {
		jh = transaction->t_checkpoint_list;
		bh = jh2bh(jh);

		if (buffer_locked(bh)) {
			spin_unlock(&journal->j_list_lock);
			get_bh(bh);
			wait_on_buffer(bh);
			/* the journal_head may have gone by now */
			BUFFER_TRACE(bh, "brelse");
			__brelse(bh);
			goto retry;
		}
		if (jh->b_transaction != NULL) {
			transaction_t *t = jh->b_transaction;
			tid_t tid = t->t_tid;

			transaction->t_chp_stats.cs_forced_to_close++;
			spin_unlock(&journal->j_list_lock);
			if (unlikely(journal->j_flags & JBD2_UNMOUNT))
				/*
				 * The journal thread is dead; so
				 * starting and waiting for a commit
				 * to finish will cause us to wait for
				 * a _very_ long time.
				 */
				printk(KERN_ERR
		"JBD2: %s: Waiting for Godot: block %llu\n",
		journal->j_devname, (unsigned long long) bh->b_blocknr);

			jbd2_log_start_commit(journal, tid);
			jbd2_log_wait_commit(journal, tid);
			goto retry;
		}
		if (!buffer_dirty(bh)) {
			if (unlikely(buffer_write_io_error(bh)) && !result)
				result = -EIO;
			BUFFER_TRACE(bh, "remove from checkpoint");
			if (__jbd2_journal_remove_checkpoint(jh))
				/* The transaction was released; we're done */
				goto out;
			continue;
		}
		/*
		 * Important: we are about to write the buffer, and
		 * possibly block, while still holding the journal
		 * lock.  We cannot afford to let the transaction
		 * logic start messing around with this buffer before
		 * we write it to disk, as that would break
		 * recoverability.
		 */
		BUFFER_TRACE(bh, "queue");
		get_bh(bh);
		J_ASSERT_BH(bh, !buffer_jwrite(bh));
		journal->j_chkpt_bhs[batch_count++] = bh;
		__buffer_relink_io(jh);
		transaction->t_chp_stats.cs_written++;
		if ((batch_count == JBD2_NR_BATCH) ||
		    need_resched() ||
		    spin_needbreak(&journal->j_list_lock))
			goto unlock_and_flush;
	}

	if (batch_count) {
		unlock_and_flush:
			spin_unlock(&journal->j_list_lock);
		retry:
			if (batch_count)
				__flush_batch(journal, &batch_count);
			spin_lock(&journal->j_list_lock);
			goto restart;
	}

	/*
	 * Now we issued all of the transaction's buffers, let's deal
	 * with the buffers that are out for I/O.
	 */
restart2:
	/* Did somebody clean up the transaction in the meanwhile? */
	if (journal->j_checkpoint_transactions != transaction ||
	    transaction->t_tid != this_tid)
		goto out;

	while (transaction->t_checkpoint_io_list) {
		jh = transaction->t_checkpoint_io_list;
		bh = jh2bh(jh);
		if (buffer_locked(bh)) {
			spin_unlock(&journal->j_list_lock);
			get_bh(bh);
			wait_on_buffer(bh);
			/* the journal_head may have gone by now */
			BUFFER_TRACE(bh, "brelse");
			__brelse(bh);
			spin_lock(&journal->j_list_lock);
			goto restart2;
		}
		if (unlikely(buffer_write_io_error(bh)) && !result)
			result = -EIO;

		/*
		 * Now in whatever state the buffer currently is, we
		 * know that it has been written out and so we can
		 * drop it from the list
		 */
		if (__jbd2_journal_remove_checkpoint(jh))
			break;
	}
out:
	spin_unlock(&journal->j_list_lock);
	if (result < 0)
		jbd2_journal_abort(journal, result);
	else
		result = jbd2_cleanup_journal_tail(journal);

	return (result < 0) ? result : 0;
}
コード例 #4
0
ファイル: commit.c プロジェクト: markosilla/linux-raspberry
/*
 *  Submit all the data buffers to disk
 */
static int journal_submit_data_buffers(journal_t *journal,
                                       transaction_t *commit_transaction,
                                       int write_op)
{
    struct journal_head *jh;
    struct buffer_head *bh;
    int locked;
    int bufs = 0;
    struct buffer_head **wbuf = journal->j_wbuf;
    int err = 0;

    /*
     * Whenever we unlock the journal and sleep, things can get added
     * onto ->t_sync_datalist, so we have to keep looping back to
     * write_out_data until we *know* that the list is empty.
     *
     * Cleanup any flushed data buffers from the data list.  Even in
     * abort mode, we want to flush this out as soon as possible.
     */
write_out_data:
    cond_resched();
    spin_lock(&journal->j_list_lock);

    while (commit_transaction->t_sync_datalist) {
        jh = commit_transaction->t_sync_datalist;
        bh = jh2bh(jh);
        locked = 0;

        /* Get reference just to make sure buffer does not disappear
         * when we are forced to drop various locks */
        get_bh(bh);
        /* If the buffer is dirty, we need to submit IO and hence
         * we need the buffer lock. We try to lock the buffer without
         * blocking. If we fail, we need to drop j_list_lock and do
         * blocking lock_buffer().
         */
        if (buffer_dirty(bh)) {
            if (!trylock_buffer(bh)) {
                BUFFER_TRACE(bh, "needs blocking lock");
                spin_unlock(&journal->j_list_lock);
                trace_jbd_do_submit_data(journal,
                                         commit_transaction);
                /* Write out all data to prevent deadlocks */
                journal_do_submit_data(wbuf, bufs, write_op);
                bufs = 0;
                lock_buffer(bh);
                spin_lock(&journal->j_list_lock);
            }
            locked = 1;
        }
        /* We have to get bh_state lock. Again out of order, sigh. */
        if (!inverted_lock(journal, bh)) {
            jbd_lock_bh_state(bh);
            spin_lock(&journal->j_list_lock);
        }
        /* Someone already cleaned up the buffer? */
        if (!buffer_jbd(bh) || bh2jh(bh) != jh
                || jh->b_transaction != commit_transaction
                || jh->b_jlist != BJ_SyncData) {
            jbd_unlock_bh_state(bh);
            if (locked)
                unlock_buffer(bh);
            BUFFER_TRACE(bh, "already cleaned up");
            release_data_buffer(bh);
            continue;
        }
        if (locked && test_clear_buffer_dirty(bh)) {
            BUFFER_TRACE(bh, "needs writeout, adding to array");
            wbuf[bufs++] = bh;
            __journal_file_buffer(jh, commit_transaction,
                                  BJ_Locked);
            jbd_unlock_bh_state(bh);
            if (bufs == journal->j_wbufsize) {
                spin_unlock(&journal->j_list_lock);
                trace_jbd_do_submit_data(journal,
                                         commit_transaction);
                journal_do_submit_data(wbuf, bufs, write_op);
                bufs = 0;
                goto write_out_data;
            }
        } else if (!locked && buffer_locked(bh)) {
            __journal_file_buffer(jh, commit_transaction,
                                  BJ_Locked);
            jbd_unlock_bh_state(bh);
            put_bh(bh);
        } else {
            BUFFER_TRACE(bh, "writeout complete: unfile");
            if (unlikely(!buffer_uptodate(bh)))
                err = -EIO;
            __journal_unfile_buffer(jh);
            jbd_unlock_bh_state(bh);
            if (locked)
                unlock_buffer(bh);
            release_data_buffer(bh);
        }

        if (need_resched() || spin_needbreak(&journal->j_list_lock)) {
            spin_unlock(&journal->j_list_lock);
            goto write_out_data;
        }
    }
    spin_unlock(&journal->j_list_lock);
    trace_jbd_do_submit_data(journal, commit_transaction);
    journal_do_submit_data(wbuf, bufs, write_op);

    return err;
}
コード例 #5
0
ファイル: balloc.c プロジェクト: ZHAW-INES/rioxo-linux-2.6
/**
 * ext4_add_groupblocks() -- Add given blocks to an existing group
 * @handle:			handle to this transaction
 * @sb:				super block
 * @block:			start physcial block to add to the block group
 * @count:			number of blocks to free
 *
 * This marks the blocks as free in the bitmap. We ask the
 * mballoc to reload the buddy after this by setting group
 * EXT4_GROUP_INFO_NEED_INIT_BIT flag
 */
void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
			 ext4_fsblk_t block, unsigned long count)
{
	struct buffer_head *bitmap_bh = NULL;
	struct buffer_head *gd_bh;
	ext4_group_t block_group;
	ext4_grpblk_t bit;
	unsigned int i;
	struct ext4_group_desc *desc;
	struct ext4_super_block *es;
	struct ext4_sb_info *sbi;
	int err = 0, ret, blk_free_count;
	ext4_grpblk_t blocks_freed;
	struct ext4_group_info *grp;

	sbi = EXT4_SB(sb);
	es = sbi->s_es;
	ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1);

	ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
	grp = ext4_get_group_info(sb, block_group);
	/*
	 * Check to see if we are freeing blocks across a group
	 * boundary.
	 */
	if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) {
		goto error_return;
	}
	bitmap_bh = ext4_read_block_bitmap(sb, block_group);
	if (!bitmap_bh)
		goto error_return;
	desc = ext4_get_group_desc(sb, block_group, &gd_bh);
	if (!desc)
		goto error_return;

	if (in_range(ext4_block_bitmap(sb, desc), block, count) ||
	    in_range(ext4_inode_bitmap(sb, desc), block, count) ||
	    in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) ||
	    in_range(block + count - 1, ext4_inode_table(sb, desc),
		     sbi->s_itb_per_group)) {
		ext4_error(sb, __func__,
			   "Adding blocks in system zones - "
			   "Block = %llu, count = %lu",
			   block, count);
		goto error_return;
	}

	/*
	 * We are about to add blocks to the bitmap,
	 * so we need undo access.
	 */
	BUFFER_TRACE(bitmap_bh, "getting undo access");
	err = ext4_journal_get_undo_access(handle, bitmap_bh);
	if (err)
		goto error_return;

	/*
	 * We are about to modify some metadata.  Call the journal APIs
	 * to unshare ->b_data if a currently-committing transaction is
	 * using it
	 */
	BUFFER_TRACE(gd_bh, "get_write_access");
	err = ext4_journal_get_write_access(handle, gd_bh);
	if (err)
		goto error_return;
	/*
	 * make sure we don't allow a parallel init on other groups in the
	 * same buddy cache
	 */
	down_write(&grp->alloc_sem);
	for (i = 0, blocks_freed = 0; i < count; i++) {
		BUFFER_TRACE(bitmap_bh, "clear bit");
		if (!ext4_clear_bit_atomic(ext4_group_lock_ptr(sb, block_group),
						bit + i, bitmap_bh->b_data)) {
			ext4_error(sb, __func__,
				   "bit already cleared for block %llu",
				   (ext4_fsblk_t)(block + i));
			BUFFER_TRACE(bitmap_bh, "bit already cleared");
		} else {
			blocks_freed++;
		}
	}
	ext4_lock_group(sb, block_group);
	blk_free_count = blocks_freed + ext4_free_blks_count(sb, desc);
	ext4_free_blks_set(sb, desc, blk_free_count);
	desc->bg_checksum = ext4_group_desc_csum(sbi, block_group, desc);
	ext4_unlock_group(sb, block_group);
	percpu_counter_add(&sbi->s_freeblocks_counter, blocks_freed);

	if (sbi->s_log_groups_per_flex) {
		ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
		atomic_add(blocks_freed,
			   &sbi->s_flex_groups[flex_group].free_blocks);
	}
	/*
	 * request to reload the buddy with the
	 * new bitmap information
	 */
	set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state));
	grp->bb_free += blocks_freed;
	up_write(&grp->alloc_sem);

	/* We dirtied the bitmap block */
	BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
	err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);

	/* And the group descriptor block */
	BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
	ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh);
	if (!err)
		err = ret;
	sb->s_dirt = 1;

error_return:
	brelse(bitmap_bh);
	ext4_std_error(sb, err);
	return;
}
コード例 #6
0
ファイル: ialloc.c プロジェクト: 303750856/linux-3.1
/*
 * NOTE! When we get the inode, we're the only people
 * that have access to it, and as such there are no
 * race conditions we have to worry about. The inode
 * is not on the hash-lists, and it cannot be reached
 * through the filesystem because the directory entry
 * has been deleted earlier.
 *
 * HOWEVER: we must make sure that we get no aliases,
 * which means that we have to call "clear_inode()"
 * _before_ we mark the inode not in use in the inode
 * bitmaps. Otherwise a newly created file might use
 * the same inode number (not actually the same pointer
 * though), and then we'd have two inodes sharing the
 * same inode number and space on the harddisk.
 */
void ext3_free_inode (handle_t *handle, struct inode * inode)
{
	struct super_block * sb = inode->i_sb;
	int is_directory;
	unsigned long ino;
	struct buffer_head *bitmap_bh = NULL;
	struct buffer_head *bh2;
	unsigned long block_group;
	unsigned long bit;
	struct ext3_group_desc * gdp;
	struct ext3_super_block * es;
	struct ext3_sb_info *sbi;
	int fatal = 0, err;

	if (atomic_read(&inode->i_count) > 1) {
		printk ("ext3_free_inode: inode has count=%d\n",
					atomic_read(&inode->i_count));
		return;
	}
	if (inode->i_nlink) {
		printk ("ext3_free_inode: inode has nlink=%d\n",
			inode->i_nlink);
		return;
	}
	if (!sb) {
		printk("ext3_free_inode: inode on nonexistent device\n");
		return;
	}
	sbi = EXT3_SB(sb);

	ino = inode->i_ino;
	ext3_debug ("freeing inode %lu\n", ino);
	trace_ext3_free_inode(inode);

	is_directory = S_ISDIR(inode->i_mode);

	es = EXT3_SB(sb)->s_es;
	if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_free_inode",
			    "reserved or nonexistent inode %lu", ino);
		goto error_return;
	}
	block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
	bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
	bitmap_bh = read_inode_bitmap(sb, block_group);
	if (!bitmap_bh)
		goto error_return;

	BUFFER_TRACE(bitmap_bh, "get_write_access");
	fatal = ext3_journal_get_write_access(handle, bitmap_bh);
	if (fatal)
		goto error_return;

	/* Ok, now we can actually update the inode bitmaps.. */
	if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
					bit, bitmap_bh->b_data))
		ext3_error (sb, "ext3_free_inode",
			      "bit already cleared for inode %lu", ino);
	else {
		gdp = ext3_get_group_desc (sb, block_group, &bh2);

		BUFFER_TRACE(bh2, "get_write_access");
		fatal = ext3_journal_get_write_access(handle, bh2);
		if (fatal) goto error_return;

		if (gdp) {
			spin_lock(sb_bgl_lock(sbi, block_group));
			le16_add_cpu(&gdp->bg_free_inodes_count, 1);
			if (is_directory)
				le16_add_cpu(&gdp->bg_used_dirs_count, -1);
			spin_unlock(sb_bgl_lock(sbi, block_group));
			percpu_counter_inc(&sbi->s_freeinodes_counter);
			if (is_directory)
				percpu_counter_dec(&sbi->s_dirs_counter);

		}
		BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
		err = ext3_journal_dirty_metadata(handle, bh2);
		if (!fatal) fatal = err;
	}
	BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bitmap_bh);
	if (!fatal)
		fatal = err;

error_return:
	brelse(bitmap_bh);
	ext3_std_error(sb, fatal);
}
コード例 #7
0
static int __process_buffer(journal_t *journal, struct journal_head *jh,
			    int *batch_count, transaction_t *transaction)
{
	struct buffer_head *bh = jh2bh(jh);
	int ret = 0;

	if (buffer_locked(bh)) {
		get_bh(bh);
		spin_unlock(&journal->j_list_lock);
		wait_on_buffer(bh);
		/*                                       */
		BUFFER_TRACE(bh, "brelse");
		__brelse(bh);
		ret = 1;
	} else if (jh->b_transaction != NULL) {
		transaction_t *t = jh->b_transaction;
		tid_t tid = t->t_tid;

		transaction->t_chp_stats.cs_forced_to_close++;
		spin_unlock(&journal->j_list_lock);
		if (unlikely(journal->j_flags & JBD2_UNMOUNT))
			/*
                                                 
                                               
                                        
    */
			printk(KERN_ERR "JBD2: %s: "
			       "Waiting for Godot: block %llu\n",
			       journal->j_devname,
			       (unsigned long long) bh->b_blocknr);
		jbd2_log_start_commit(journal, tid);
		jbd2_log_wait_commit(journal, tid);
		ret = 1;
	} else if (!buffer_dirty(bh)) {
		ret = 1;
		if (unlikely(buffer_write_io_error(bh)))
			ret = -EIO;
		get_bh(bh);
		BUFFER_TRACE(bh, "remove from checkpoint");
		__jbd2_journal_remove_checkpoint(jh);
		spin_unlock(&journal->j_list_lock);
		__brelse(bh);
	} else {
		/*
                                                     
                                                          
                                                        
                                                          
                                              
   */
		BUFFER_TRACE(bh, "queue");
		get_bh(bh);
		J_ASSERT_BH(bh, !buffer_jwrite(bh));
		journal->j_chkpt_bhs[*batch_count] = bh;
		__buffer_relink_io(jh);
		transaction->t_chp_stats.cs_written++;
		(*batch_count)++;
		if (*batch_count == JBD2_NR_BATCH) {
			spin_unlock(&journal->j_list_lock);
			__flush_batch(journal, batch_count);
			ret = 1;
		}
	}
	return ret;
}
コード例 #8
0
ファイル: inline.c プロジェクト: shengwenhui/aufs4-linux
static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
				   unsigned int len)
{
	int error;
	void *value = NULL;
	struct ext4_xattr_ibody_find is = {
		.s = { .not_found = -ENODATA, },
	};
	struct ext4_xattr_info i = {
		.name_index = EXT4_XATTR_INDEX_SYSTEM,
		.name = EXT4_XATTR_SYSTEM_DATA,
	};

	/* If the old space is ok, write the data directly. */
	if (len <= EXT4_I(inode)->i_inline_size)
		return 0;

	error = ext4_get_inode_loc(inode, &is.iloc);
	if (error)
		return error;

	error = ext4_xattr_ibody_find(inode, &i, &is);
	if (error)
		goto out;

	BUG_ON(is.s.not_found);

	len -= EXT4_MIN_INLINE_DATA_SIZE;
	value = kzalloc(len, GFP_NOFS);
	if (!value)
		goto out;

	error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
				     value, len);
	if (error == -ENODATA)
		goto out;

	BUFFER_TRACE(is.iloc.bh, "get_write_access");
	error = ext4_journal_get_write_access(handle, is.iloc.bh);
	if (error)
		goto out;

	/* Update the xttr entry. */
	i.value = value;
	i.value_len = len;

	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
	if (error)
		goto out;

	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
				      (void *)ext4_raw_inode(&is.iloc));
	EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
				le32_to_cpu(is.s.here->e_value_size);
	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
	get_bh(is.iloc.bh);
	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);

out:
	kfree(value);
	brelse(is.iloc.bh);
	return error;
}
コード例 #9
0
ファイル: commit.c プロジェクト: PennPanda/linux-repo
/*
 * jbd2_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 jbd2_journal_commit_transaction(journal_t *journal)
{
	transaction_t *commit_transaction;
	struct journal_head *jh, *new_jh, *descriptor;
	struct buffer_head **wbuf = journal->j_wbuf;
	int bufs;
	int flags;
	int err;
	unsigned long 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;
	int tag_bytes = journal_tag_bytes(journal);

	/*
	 * First job: lock down the current transaction and wait for
	 * all outstanding updates to complete.
	 */

#ifdef COMMIT_STATS
	spin_lock(&journal->j_list_lock);
	summarise_journal_usage(journal);
	spin_unlock(&journal->j_list_lock);
#endif

	/* Do we need to erase the effects of a prior jbd2_journal_flush? */
	if (journal->j_flags & JBD2_FLUSHED) {
		jbd_debug(3, "super block updated\n");
		jbd2_journal_update_superblock(journal, 1);
	} else {
		jbd_debug(3, "superblock not updated\n");
	}

	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);

	spin_lock(&journal->j_state_lock);
	commit_transaction->t_state = T_LOCKED;

	spin_lock(&commit_transaction->t_handle_lock);
	while (commit_transaction->t_updates) {
		DEFINE_WAIT(wait);

		prepare_to_wait(&journal->j_wait_updates, &wait,
					TASK_UNINTERRUPTIBLE);
		if (commit_transaction->t_updates) {
			spin_unlock(&commit_transaction->t_handle_lock);
			spin_unlock(&journal->j_state_lock);
			schedule();
			spin_lock(&journal->j_state_lock);
			spin_lock(&commit_transaction->t_handle_lock);
		}
		finish_wait(&journal->j_wait_updates, &wait);
	}
	spin_unlock(&commit_transaction->t_handle_lock);

	J_ASSERT (commit_transaction->t_outstanding_credits <=
			journal->j_max_transaction_buffers);

	/*
	 * 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 jbd2_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 jbd2_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");
		/*
		 * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may
		 * leave undo-committed data.
		 */
		if (jh->b_committed_data) {
			struct buffer_head *bh = jh2bh(jh);

			jbd_lock_bh_state(bh);
			jbd2_free(jh->b_committed_data, bh->b_size);
			jh->b_committed_data = NULL;
			jbd_unlock_bh_state(bh);
		}
		jbd2_journal_refile_buffer(journal, 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->j_list_lock);
	__jbd2_journal_clean_checkpoint_list(journal);
	spin_unlock(&journal->j_list_lock);

	jbd_debug (3, "JBD: commit phase 1\n");

	/*
	 * Switch to a new revoke table.
	 */
	jbd2_journal_switch_revoke_table(journal);

	commit_transaction->t_state = T_FLUSH;
	journal->j_committing_transaction = commit_transaction;
	journal->j_running_transaction = NULL;
	commit_transaction->t_log_start = journal->j_head;
	wake_up(&journal->j_wait_transaction_locked);
	spin_unlock(&journal->j_state_lock);

	jbd_debug (3, "JBD: commit phase 2\n");

	/*
	 * First, drop modified flag: all accesses to the buffers
	 * will be tracked for a new trasaction only -bzzz
	 */
	spin_lock(&journal->j_list_lock);
	if (commit_transaction->t_buffers) {
		new_jh = jh = commit_transaction->t_buffers->b_tnext;
		do {
			J_ASSERT_JH(new_jh, new_jh->b_modified == 1 ||
					new_jh->b_modified == 0);
			new_jh->b_modified = 0;
			new_jh = new_jh->b_tnext;
		} while (new_jh != jh);
	}
	spin_unlock(&journal->j_list_lock);

	/*
	 * Now start flushing things to disk, in the order they appear
	 * on the transaction lists.  Data blocks go first.
	 */
	err = 0;
	journal_submit_data_buffers(journal, commit_transaction);

	/*
	 * Wait for all previously submitted IO to complete.
	 */
	spin_lock(&journal->j_list_lock);
	while (commit_transaction->t_locked_list) {
		struct buffer_head *bh;

		jh = commit_transaction->t_locked_list->b_tprev;
		bh = jh2bh(jh);
		get_bh(bh);
		if (buffer_locked(bh)) {
			spin_unlock(&journal->j_list_lock);
			wait_on_buffer(bh);
			if (unlikely(!buffer_uptodate(bh)))
				err = -EIO;
			spin_lock(&journal->j_list_lock);
		}
		if (!inverted_lock(journal, bh)) {
			put_bh(bh);
			spin_lock(&journal->j_list_lock);
			continue;
		}
		if (buffer_jbd(bh) && jh->b_jlist == BJ_Locked) {
			__jbd2_journal_unfile_buffer(jh);
			jbd_unlock_bh_state(bh);
			jbd2_journal_remove_journal_head(bh);
			put_bh(bh);
		} else {
			jbd_unlock_bh_state(bh);
		}
		put_bh(bh);
		cond_resched_lock(&journal->j_list_lock);
	}
	spin_unlock(&journal->j_list_lock);

	if (err)
		jbd2_journal_abort(journal, err);

	jbd2_journal_write_revoke_records(journal, commit_transaction);

	jbd_debug(3, "JBD: commit phase 2\n");

	/*
	 * 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);

	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 = NULL;
	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");
			jbd2_journal_refile_buffer(journal, 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 = jbd2_journal_get_descriptor_buffer(journal);
			if (!descriptor) {
				jbd2_journal_abort(journal, -EIO);
				continue;
			}

			bh = jh2bh(descriptor);
			jbd_debug(4, "JBD: got buffer %llu (%p)\n",
				(unsigned long long)bh->b_blocknr, bh->b_data);
			header = (journal_header_t *)&bh->b_data[0];
			header->h_magic     = cpu_to_be32(JBD2_MAGIC_NUMBER);
			header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK);
			header->h_sequence  = cpu_to_be32(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_buffer_jwrite(bh);
			set_buffer_dirty(bh);
			wbuf[bufs++] = bh;

			/* Record it so that we can wait for IO
                           completion later */
			BUFFER_TRACE(bh, "ph3: file as descriptor");
			jbd2_journal_file_buffer(descriptor, commit_transaction,
					BJ_LogCtl);
		}

		/* Where is the buffer to be written? */

		err = jbd2_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) {
			jbd2_journal_abort(journal, err);
			continue;
		}

		/*
		 * start_this_handle() uses t_outstanding_credits to determine
		 * the free space in the log, but this counter is changed
		 * by jbd2_journal_next_log_block() also.
		 */
		commit_transaction->t_outstanding_credits--;

		/* 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: jbd2_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 = jbd2_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 |= JBD2_FLAG_ESCAPE;
		if (!first_tag)
			tag_flag |= JBD2_FLAG_SAME_UUID;

		tag = (journal_block_tag_t *) tagp;
		write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr);
		tag->t_flags = cpu_to_be32(tag_flag);
		tagp += tag_bytes;
		space_left -= tag_bytes;

		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 == journal->j_wbufsize ||
		    commit_transaction->t_buffers == NULL ||
		    space_left < tag_bytes + 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 |= cpu_to_be32(JBD2_FLAG_LAST_TAG);

start_journal_io:
			for (i = 0; i < bufs; i++) {
				struct buffer_head *bh = wbuf[i];
				lock_buffer(bh);
				clear_buffer_dirty(bh);
				set_buffer_uptodate(bh);
				bh->b_end_io = journal_end_buffer_io_sync;
				submit_bh(WRITE, bh);
			}
			cond_resched();

			/* 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 buffers 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 j_list_lock is not needed.
	 * See __journal_try_to_free_buffer.
	 */
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)) {
			wait_on_buffer(bh);
			goto wait_for_iobuf;
		}
		if (cond_resched())
			goto wait_for_iobuf;

		if (unlikely(!buffer_uptodate(bh)))
			err = -EIO;

		clear_buffer_jwrite(bh);

		JBUFFER_TRACE(jh, "ph4: unfile after journal write");
		jbd2_journal_unfile_buffer(journal, jh);

		/*
		 * ->t_iobuf_list should contain only dummy buffer_heads
		 * which were created by jbd2_journal_write_metadata_buffer().
		 */
		BUFFER_TRACE(bh, "dumping temporary bh");
		jbd2_journal_put_journal_head(jh);
		__brelse(bh);
		J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0);
		free_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_jbddirty(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");
		jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget);
		/* Wake up any transactions which were waiting for this
		   IO to complete */
		wake_up_bit(&bh->b_state, BH_Unshadow);
		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)) {
			wait_on_buffer(bh);
			goto wait_for_ctlbuf;
		}
		if (cond_resched())
			goto wait_for_ctlbuf;

		if (unlikely(!buffer_uptodate(bh)))
			err = -EIO;

		BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile");
		clear_buffer_jwrite(bh);
		jbd2_journal_unfile_buffer(journal, jh);
		jbd2_journal_put_journal_head(jh);
		__brelse(bh);		/* One for getblk */
		/* AKPM: bforget here */
	}

	jbd_debug(3, "JBD: commit phase 6\n");

	if (journal_write_commit_record(journal, commit_transaction))
		err = -EIO;

	if (err)
		jbd2_journal_abort(journal, err);

	/* 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. */

	jbd_debug(3, "JBD: commit phase 7\n");

	J_ASSERT(commit_transaction->t_sync_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);

restart_loop:
	/*
	 * As there are other places (journal_unmap_buffer()) adding buffers
	 * to this list we have to be careful and hold the j_list_lock.
	 */
	spin_lock(&journal->j_list_lock);
	while (commit_transaction->t_forget) {
		transaction_t *cp_transaction;
		struct buffer_head *bh;

		jh = commit_transaction->t_forget;
		spin_unlock(&journal->j_list_lock);
		bh = jh2bh(jh);
		jbd_lock_bh_state(bh);
		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) {
			jbd2_free(jh->b_committed_data, bh->b_size);
			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) {
			jbd2_free(jh->b_frozen_data, bh->b_size);
			jh->b_frozen_data = NULL;
		}

		spin_lock(&journal->j_list_lock);
		cp_transaction = jh->b_cp_transaction;
		if (cp_transaction) {
			JBUFFER_TRACE(jh, "remove from old cp transaction");
			__jbd2_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 jbd2_journal_forget, it may no longer be dirty and
		 * there's no point in keeping a checkpoint record for
		 * it. */

		/* A buffer which has been freed while still being
		 * journaled by a previous transaction may end up still
		 * being dirty here, but we want to avoid writing back
		 * that buffer in the future now that the last use has
		 * been committed.  That's not only a performance gain,
		 * it also stops aliasing problems if the buffer is left
		 * behind for writeback and gets reallocated for another
		 * use in a different page. */
		if (buffer_freed(bh)) {
			clear_buffer_freed(bh);
			clear_buffer_jbddirty(bh);
		}

		if (buffer_jbddirty(bh)) {
			JBUFFER_TRACE(jh, "add to new checkpointing trans");
			__jbd2_journal_insert_checkpoint(jh, commit_transaction);
			JBUFFER_TRACE(jh, "refile for checkpoint writeback");
			__jbd2_journal_refile_buffer(jh);
			jbd_unlock_bh_state(bh);
		} else {
			J_ASSERT_BH(bh, !buffer_dirty(bh));
			/* The buffer on BJ_Forget list and not jbddirty means
			 * it has been freed by this transaction and hence it
			 * could not have been reallocated until this
			 * transaction has committed. *BUT* it could be
			 * reallocated once we have written all the data to
			 * disk and before we process the buffer on BJ_Forget
			 * list. */
			JBUFFER_TRACE(jh, "refile or unfile freed buffer");
			__jbd2_journal_refile_buffer(jh);
			if (!jh->b_transaction) {
				jbd_unlock_bh_state(bh);
				 /* needs a brelse */
				jbd2_journal_remove_journal_head(bh);
				release_buffer_page(bh);
			} else
				jbd_unlock_bh_state(bh);
		}
		cond_resched_lock(&journal->j_list_lock);
	}
	spin_unlock(&journal->j_list_lock);
	/*
	 * This is a bit sleazy.  We borrow j_list_lock to protect
	 * journal->j_committing_transaction in __jbd2_journal_remove_checkpoint.
	 * Really, __jbd2_journal_remove_checkpoint should be using j_state_lock but
	 * it's a bit hassle to hold that across __jbd2_journal_remove_checkpoint
	 */
	spin_lock(&journal->j_state_lock);
	spin_lock(&journal->j_list_lock);
	/*
	 * Now recheck if some buffers did not get attached to the transaction
	 * while the lock was dropped...
	 */
	if (commit_transaction->t_forget) {
		spin_unlock(&journal->j_list_lock);
		spin_unlock(&journal->j_state_lock);
		goto restart_loop;
	}

	/* 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_unlock(&journal->j_state_lock);

	if (commit_transaction->t_checkpoint_list == NULL &&
	    commit_transaction->t_checkpoint_io_list == NULL) {
		__jbd2_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->j_list_lock);

	jbd_debug(1, "JBD: commit %d complete, head %d\n",
		  journal->j_commit_sequence, journal->j_tail_sequence);

	wake_up(&journal->j_wait_done_commit);
}
コード例 #10
0
ファイル: checkpoint.c プロジェクト: hugh712/Jollen
/*
 * Clean up a transaction's checkpoint list.  
 *
 * We wait for any pending IO to complete and make sure any clean
 * buffers are removed from the transaction. 
 *
 * Return 1 if we performed any actions which might have destroyed the
 * checkpoint.  (journal_remove_checkpoint() deletes the transaction when
 * the last checkpoint buffer is cleansed)
 *
 * Called with the journal locked.
 * Called with journal_datalist_lock held.
 */
static int __cleanup_transaction(journal_t *journal, transaction_t *transaction)
{
	struct journal_head *jh, *next_jh, *last_jh;
	struct buffer_head *bh;
	int ret = 0;

	assert_spin_locked(&journal_datalist_lock);
	jh = transaction->t_checkpoint_list;
	if (!jh)
		return 0;

	last_jh = jh->b_cpprev;
	next_jh = jh;
	do {
		jh = next_jh;
		bh = jh2bh(jh);
		if (buffer_locked(bh)) {
			atomic_inc(&bh->b_count);
			spin_unlock(&journal_datalist_lock);
			unlock_journal(journal);
			wait_on_buffer(bh);
			/* the journal_head may have gone by now */
			BUFFER_TRACE(bh, "brelse");
			__brelse(bh);
			goto out_return_1;
		}
		
		if (jh->b_transaction != NULL) {
			transaction_t *transaction = jh->b_transaction;
			tid_t tid = transaction->t_tid;

			spin_unlock(&journal_datalist_lock);
			log_start_commit(journal, transaction);
			unlock_journal(journal);
			log_wait_commit(journal, tid);
			goto out_return_1;
		}

		/*
		 * We used to test for (jh->b_list != BUF_CLEAN) here.
		 * But unmap_underlying_metadata() can place buffer onto
		 * BUF_CLEAN. Since refile_buffer() no longer takes buffers
		 * off checkpoint lists, we cope with it here
		 */
		/*
		 * AKPM: I think the buffer_jdirty test is redundant - it
		 * shouldn't have NULL b_transaction?
		 */
		next_jh = jh->b_cpnext;
		if (!buffer_dirty(bh) && !buffer_jdirty(bh)) {
			BUFFER_TRACE(bh, "remove from checkpoint");
			__journal_remove_checkpoint(jh);
			__journal_remove_journal_head(bh);
			refile_buffer(bh);
			__brelse(bh);
			ret = 1;
		}
		
		jh = next_jh;
	} while (jh != last_jh);

	return ret;
out_return_1:
	lock_journal(journal);
	spin_lock(&journal_datalist_lock);
	return 1;
}
コード例 #11
0
/*
 * Clean up a transaction's checkpoint list.
 *
 * We wait for any pending IO to complete and make sure any clean
 * buffers are removed from the transaction.
 *
 * Return 1 if we performed any actions which might have destroyed the
 * checkpoint.  (journal_remove_checkpoint() deletes the transaction when
 * the last checkpoint buffer is cleansed)
 *
 * Called with j_list_lock held.
 */
static int __cleanup_transaction(journal_t *journal, transaction_t *transaction)
{
	struct journal_head *jh, *next_jh, *last_jh;
	struct buffer_head *bh;
	int ret = 0;

	assert_spin_locked(&journal->j_list_lock);
	jh = transaction->t_checkpoint_list;
	if (!jh)
		return 0;

	last_jh = jh->b_cpprev;
	next_jh = jh;
	do {
		jh = next_jh;
		bh = jh2bh(jh);
		if (buffer_locked(bh)) {
			atomic_inc(&bh->b_count);
			spin_unlock(&journal->j_list_lock);
			wait_on_buffer(bh);
			/* the journal_head may have gone by now */
			BUFFER_TRACE(bh, "brelse");
			__brelse(bh);
			goto out_return_1;
		}

		/*
		 * This is foul
		 */
		if (!jbd_trylock_bh_state(bh)) {
			jbd_sync_bh(journal, bh);
			goto out_return_1;
		}

		if (jh->b_transaction != NULL) {
			transaction_t *t = jh->b_transaction;
			tid_t tid = t->t_tid;

			spin_unlock(&journal->j_list_lock);
			jbd_unlock_bh_state(bh);
			log_start_commit(journal, tid);
			log_wait_commit(journal, tid);
			goto out_return_1;
		}

		/*
		 * AKPM: I think the buffer_jbddirty test is redundant - it
		 * shouldn't have NULL b_transaction?
		 */
		next_jh = jh->b_cpnext;
		if (!buffer_dirty(bh) && !buffer_jbddirty(bh)) {
			BUFFER_TRACE(bh, "remove from checkpoint");
			__journal_remove_checkpoint(jh);
			jbd_unlock_bh_state(bh);
			journal_remove_journal_head(bh);
			__brelse(bh);
			ret = 1;
		} else {
			jbd_unlock_bh_state(bh);
		}
	} while (jh != last_jh);

	return ret;
out_return_1:
	spin_lock(&journal->j_list_lock);
	return 1;
}
コード例 #12
0
ファイル: inline.c プロジェクト: 285452612/ali_kernel
/*
 * Try to add the new entry to the inline data.
 * If succeeds, return 0. If not, extended the inline dir and copied data to
 * the new created block.
 */
int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
			      struct inode *inode)
{
	int ret, inline_size;
	void *inline_start, *backup_buf = NULL;
	struct buffer_head *dir_block = NULL;
	struct ext4_iloc iloc;
	int blocksize = inode->i_sb->s_blocksize;
	struct inode *dir = dentry->d_parent->d_inode;

	ret = ext4_get_inode_loc(dir, &iloc);
	if (ret)
		return ret;

	down_write(&EXT4_I(dir)->xattr_sem);
	if (!ext4_has_inline_data(dir))
		goto out;

	inline_start = ext4_raw_inode(&iloc)->i_block;
	inline_size = EXT4_MIN_INLINE_DATA_SIZE;

	ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
					inline_start, inline_size);
	if (ret != -ENOSPC)
		goto out;

	/* check whether it can be inserted to inline xattr space. */
	inline_size = EXT4_I(dir)->i_inline_size -
			EXT4_MIN_INLINE_DATA_SIZE;
	if (inline_size > 0) {
		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);

		ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
						inline_start, inline_size);
		if (ret != -ENOSPC)
			goto out;
	}

	/* Try to add more xattr space.*/
	ret = ext4_update_inline_dir(handle, dentry, dir, &iloc);
	if (ret && ret != -ENOSPC)
		goto out;
	else if (!ret) {
		inline_size = EXT4_I(dir)->i_inline_size -
				EXT4_MIN_INLINE_DATA_SIZE;
		inline_start = ext4_get_inline_xattr_pos(dir, &iloc);

		ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
						inline_start, inline_size);
		if (ret != -ENOSPC)
			goto out;
	}

	/*
	 * The inline space is filled up, so create a new block for it.
	 * As the extent tree will be created, we have to save the inline
	 * dir first.
	 */
	inline_size = EXT4_I(dir)->i_inline_size;
	backup_buf = kmalloc(inline_size, GFP_NOFS);
	if (!backup_buf) {
		ret = -ENOMEM;
		goto out;
	}

	memcpy(backup_buf, (void *)ext4_raw_inode(&iloc)->i_block,
	       EXT4_MIN_INLINE_DATA_SIZE);
	if (inline_size > EXT4_MIN_INLINE_DATA_SIZE)
		memcpy(backup_buf + EXT4_MIN_INLINE_DATA_SIZE,
		       ext4_get_inline_xattr_pos(dir, &iloc),
		       inline_size - EXT4_MIN_INLINE_DATA_SIZE);

	/* clear the entry and the flag in dir now. */
	ret = ext4_destroy_inline_data_nolock(handle, dir);
	if (ret)
		goto out;

	dir->i_size = EXT4_I(dir)->i_disksize = blocksize;
	dir_block = ext4_bread(handle, dir, 0, 1, &ret);
	if (!dir_block)
		goto out;

	BUFFER_TRACE(dir_block, "get_write_access");
	ret = ext4_journal_get_write_access(handle, dir_block);
	if (ret)
		goto out;
	memcpy(dir_block->b_data, backup_buf, inline_size);

	/* Set the final de to cover the whole block. */
	ext4_update_final_de(dir_block->b_data, inline_size,
			     blocksize);

	BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
	ret = ext4_handle_dirty_metadata(handle, dir, dir_block);

out:
	kfree(backup_buf);
	brelse(dir_block);
	if (!ret || ret == 1)
		ext4_mark_inode_dirty(handle, dir);
	up_write(&EXT4_I(dir)->xattr_sem);
	brelse(iloc.bh);
	return ret;
}
コード例 #13
0
/*
 * Try to flush one buffer from the checkpoint list to disk.
 *
 * Return 1 if something happened which requires us to abort the current
 * scan of the checkpoint list.  Return <0 if the buffer has failed to
 * be written out.
 *
 * Called with j_list_lock held and drops it if 1 is returned
 */
static int __process_buffer(journal_t *journal, struct journal_head *jh,
			    int *batch_count, transaction_t *transaction)
{
	struct buffer_head *bh = jh2bh(jh);
	int ret = 0;

	if (buffer_locked(bh)) {
		get_bh(bh);
		spin_unlock(&journal->j_list_lock);
		wait_on_buffer(bh);
		/* the journal_head may have gone by now */
		BUFFER_TRACE(bh, "brelse");
		__brelse(bh);
		ret = 1;
	} else if (jh->b_transaction != NULL) {
		transaction_t *t = jh->b_transaction;
		tid_t tid = t->t_tid;

		transaction->t_chp_stats.cs_forced_to_close++;
		spin_unlock(&journal->j_list_lock);
		if (unlikely(journal->j_flags & JBD2_UNMOUNT))
			/*
			 * The journal thread is dead; so starting and
			 * waiting for a commit to finish will cause
			 * us to wait for a _very_ long time.
			 */
			printk(KERN_ERR "JBD2: %s: "
			       "Waiting for Godot: block %llu\n",
			       journal->j_devname,
			       (unsigned long long) bh->b_blocknr);
		jbd2_log_start_commit(journal, tid);
		jbd2_log_wait_commit(journal, tid);
		ret = 1;
	} else if (!buffer_dirty(bh)) {
		ret = 1;
		if (unlikely(buffer_write_io_error(bh)))
			ret = -EIO;
		get_bh(bh);
		BUFFER_TRACE(bh, "remove from checkpoint");
		__jbd2_journal_remove_checkpoint(jh);
		spin_unlock(&journal->j_list_lock);
		__brelse(bh);
	} else {
		/*
		 * Important: we are about to write the buffer, and
		 * possibly block, while still holding the journal lock.
		 * We cannot afford to let the transaction logic start
		 * messing around with this buffer before we write it to
		 * disk, as that would break recoverability.
		 */
		BUFFER_TRACE(bh, "queue");
		get_bh(bh);
		J_ASSERT_BH(bh, !buffer_jwrite(bh));
		journal->j_chkpt_bhs[*batch_count] = bh;
		__buffer_relink_io(jh);
		transaction->t_chp_stats.cs_written++;
		(*batch_count)++;
		if (*batch_count == JBD2_NR_BATCH) {
			spin_unlock(&journal->j_list_lock);
			__flush_batch(journal, batch_count);
			ret = 1;
		}
	}
	return ret;
}
コード例 #14
0
ファイル: ialloc.c プロジェクト: hugh712/Jollen
/*
 * There are two policies for allocating an inode.  If the new inode is
 * a directory, then a forward search is made for a block group with both
 * free space and a low directory-to-inode ratio; if that fails, then of
 * the groups with above-average free space, that group with the fewest
 * directories already is chosen.
 *
 * For other inodes, search forward from the parent directory's block
 * group to find a free inode.
 */
struct inode * ext3_new_inode (handle_t *handle,
				const struct inode * dir, int mode)
{
	struct super_block * sb;
	struct buffer_head * bh;
	struct buffer_head * bh2;
	int i, j, avefreei;
	struct inode * inode;
	int bitmap_nr;
	struct ext3_group_desc * gdp;
	struct ext3_group_desc * tmp;
	struct ext3_super_block * es;
	int err = 0;

	/* Cannot create files in a deleted directory */
	if (!dir || !dir->i_nlink)
		return ERR_PTR(-EPERM);

	sb = dir->i_sb;
	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	init_rwsem(&inode->u.ext3_i.truncate_sem);

	lock_super (sb);
	es = sb->u.ext3_sb.s_es;
repeat:
	gdp = NULL;
	i = 0;

	if (S_ISDIR(mode)) {
		avefreei = le32_to_cpu(es->s_free_inodes_count) /
			sb->u.ext3_sb.s_groups_count;
		if (!gdp) {
			for (j = 0; j < sb->u.ext3_sb.s_groups_count; j++) {
				struct buffer_head *temp_buffer;
				tmp = ext3_get_group_desc (sb, j, &temp_buffer);
				if (tmp &&
				    le16_to_cpu(tmp->bg_free_inodes_count) &&
				    le16_to_cpu(tmp->bg_free_inodes_count) >=
							avefreei) {
					if (!gdp || (le16_to_cpu(tmp->bg_free_blocks_count) >
						le16_to_cpu(gdp->bg_free_blocks_count))) {
						i = j;
						gdp = tmp;
						bh2 = temp_buffer;
					}
				}
			}
		}
	} else {
		/*
		 * Try to place the inode in its parent directory
		 */
		i = dir->u.ext3_i.i_block_group;
		tmp = ext3_get_group_desc (sb, i, &bh2);
		if (tmp && le16_to_cpu(tmp->bg_free_inodes_count))
			gdp = tmp;
		else
		{
			/*
			 * Use a quadratic hash to find a group with a
			 * free inode
			 */
			for (j = 1; j < sb->u.ext3_sb.s_groups_count; j <<= 1) {
				i += j;
				if (i >= sb->u.ext3_sb.s_groups_count)
					i -= sb->u.ext3_sb.s_groups_count;
				tmp = ext3_get_group_desc (sb, i, &bh2);
				if (tmp &&
				    le16_to_cpu(tmp->bg_free_inodes_count)) {
					gdp = tmp;
					break;
				}
			}
		}
		if (!gdp) {
			/*
			 * That failed: try linear search for a free inode
			 */
			i = dir->u.ext3_i.i_block_group + 1;
			for (j = 2; j < sb->u.ext3_sb.s_groups_count; j++) {
				if (++i >= sb->u.ext3_sb.s_groups_count)
					i = 0;
				tmp = ext3_get_group_desc (sb, i, &bh2);
				if (tmp &&
				    le16_to_cpu(tmp->bg_free_inodes_count)) {
					gdp = tmp;
					break;
				}
			}
		}
	}

	err = -ENOSPC;
	if (!gdp)
		goto fail;

	err = -EIO;
	bitmap_nr = load_inode_bitmap (sb, i);
	if (bitmap_nr < 0)
		goto fail;

	bh = sb->u.ext3_sb.s_inode_bitmap[bitmap_nr];

	if ((j = ext3_find_first_zero_bit ((unsigned long *) bh->b_data,
				      EXT3_INODES_PER_GROUP(sb))) <
	    EXT3_INODES_PER_GROUP(sb)) {
		BUFFER_TRACE(bh, "get_write_access");
		err = ext3_journal_get_write_access(handle, bh);
		if (err) goto fail;
		
		if (ext3_set_bit (j, bh->b_data)) {
			ext3_error (sb, "ext3_new_inode",
				      "bit already set for inode %d", j);
			goto repeat;
		}
		BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
		err = ext3_journal_dirty_metadata(handle, bh);
		if (err) goto fail;
	} else {
		if (le16_to_cpu(gdp->bg_free_inodes_count) != 0) {
			ext3_error (sb, "ext3_new_inode",
				    "Free inodes count corrupted in group %d",
				    i);
			/* Is it really ENOSPC? */
			err = -ENOSPC;
			if (sb->s_flags & MS_RDONLY)
				goto fail;

			BUFFER_TRACE(bh2, "get_write_access");
			err = ext3_journal_get_write_access(handle, bh2);
			if (err) goto fail;
			gdp->bg_free_inodes_count = 0;
			BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
			err = ext3_journal_dirty_metadata(handle, bh2);
			if (err) goto fail;
		}
		goto repeat;
	}
	j += i * EXT3_INODES_PER_GROUP(sb) + 1;
	if (j < EXT3_FIRST_INO(sb) || j > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_new_inode",
			    "reserved inode or inode > inodes count - "
			    "block_group = %d,inode=%d", i, j);
		err = -EIO;
		goto fail;
	}

	BUFFER_TRACE(bh2, "get_write_access");
	err = ext3_journal_get_write_access(handle, bh2);
	if (err) goto fail;
	gdp->bg_free_inodes_count =
		cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
	if (S_ISDIR(mode))
		gdp->bg_used_dirs_count =
			cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
	BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bh2);
	if (err) goto fail;
	
	BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "get_write_access");
	err = ext3_journal_get_write_access(handle, sb->u.ext3_sb.s_sbh);
	if (err) goto fail;
	es->s_free_inodes_count =
		cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) - 1);
	BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, sb->u.ext3_sb.s_sbh);
	sb->s_dirt = 1;
	if (err) goto fail;

	inode->i_uid = current->fsuid;
	if (test_opt (sb, GRPID))
		inode->i_gid = dir->i_gid;
	else if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else
		inode->i_gid = current->fsgid;
	inode->i_mode = mode;

	inode->i_ino = j;
	/* This is the optimal IO size (for stat), not the fs block size */
	inode->i_blksize = PAGE_SIZE;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	inode->u.ext3_i.i_flags = dir->u.ext3_i.i_flags & ~EXT3_INDEX_FL;
	if (S_ISLNK(mode))
		inode->u.ext3_i.i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL);
#ifdef EXT3_FRAGMENTS
	inode->u.ext3_i.i_faddr = 0;
	inode->u.ext3_i.i_frag_no = 0;
	inode->u.ext3_i.i_frag_size = 0;
#endif
	inode->u.ext3_i.i_file_acl = 0;
	inode->u.ext3_i.i_dir_acl = 0;
	inode->u.ext3_i.i_dtime = 0;
	INIT_LIST_HEAD(&inode->u.ext3_i.i_orphan);
#ifdef EXT3_PREALLOCATE
	inode->u.ext3_i.i_prealloc_count = 0;
#endif
	inode->u.ext3_i.i_block_group = i;
	
	if (inode->u.ext3_i.i_flags & EXT3_SYNC_FL)
		inode->i_flags |= S_SYNC;
	if (IS_SYNC(inode))
		handle->h_sync = 1;
	insert_inode_hash(inode);
	inode->i_generation = sb->u.ext3_sb.s_next_generation++;

	inode->u.ext3_i.i_state = EXT3_STATE_NEW;
	err = ext3_mark_inode_dirty(handle, inode);
	if (err) goto fail;
	
	unlock_super (sb);
	if(DQUOT_ALLOC_INODE(inode)) {
		DQUOT_DROP(inode);
		inode->i_flags |= S_NOQUOTA;
		inode->i_nlink = 0;
		iput(inode);
		return ERR_PTR(-EDQUOT);
	}
	ext3_debug ("allocating inode %lu\n", inode->i_ino);
	return inode;

fail:
	unlock_super(sb);
	iput(inode);
	ext3_std_error(sb, err);
	return ERR_PTR(err);
}
コード例 #15
0
/*
 * 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 buffer_head **wbuf = journal->j_wbuf;
	int bufs;
	int flags;
	int err;
	unsigned int blocknr;
	ktime_t start_time;
	u64 commit_time;
	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;
	struct blk_plug plug;

	/*
	 * First job: lock down the current transaction and wait for
	 * all outstanding updates to complete.
	 */

	/* 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");
	}

	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);

	trace_jbd_start_commit(journal, commit_transaction);
	jbd_debug(1, "JBD: starting commit of transaction %d\n",
			commit_transaction->t_tid);

	spin_lock(&journal->j_state_lock);
	commit_transaction->t_state = T_LOCKED;

	trace_jbd_commit_locking(journal, commit_transaction);
	spin_lock(&commit_transaction->t_handle_lock);
	while (commit_transaction->t_updates) {
		DEFINE_WAIT(wait);

		prepare_to_wait(&journal->j_wait_updates, &wait,
					TASK_UNINTERRUPTIBLE);
		if (commit_transaction->t_updates) {
			spin_unlock(&commit_transaction->t_handle_lock);
			spin_unlock(&journal->j_state_lock);
			schedule();
			spin_lock(&journal->j_state_lock);
			spin_lock(&commit_transaction->t_handle_lock);
		}
		finish_wait(&journal->j_wait_updates, &wait);
	}
	spin_unlock(&commit_transaction->t_handle_lock);

	J_ASSERT (commit_transaction->t_outstanding_credits <=
			journal->j_max_transaction_buffers);

	/*
	 * 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 permissible.
	 */
	while (commit_transaction->t_reserved_list) {
		jh = commit_transaction->t_reserved_list;
		JBUFFER_TRACE(jh, "reserved, unused: refile");
		/*
		 * A journal_get_undo_access()+journal_release_buffer() may
		 * leave undo-committed data.
		 */
		if (jh->b_committed_data) {
			struct buffer_head *bh = jh2bh(jh);

			jbd_lock_bh_state(bh);
			jbd_free(jh->b_committed_data, bh->b_size);
			jh->b_committed_data = NULL;
			jbd_unlock_bh_state(bh);
		}
		journal_refile_buffer(journal, 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->j_list_lock);
	__journal_clean_checkpoint_list(journal);
	spin_unlock(&journal->j_list_lock);

	jbd_debug (3, "JBD: commit phase 1\n");

	/*
	 * Switch to a new revoke table.
	 */
	journal_switch_revoke_table(journal);

	trace_jbd_commit_flushing(journal, commit_transaction);
	commit_transaction->t_state = T_FLUSH;
	journal->j_committing_transaction = commit_transaction;
	journal->j_running_transaction = NULL;
	start_time = ktime_get();
	commit_transaction->t_log_start = journal->j_head;
	wake_up(&journal->j_wait_transaction_locked);
	spin_unlock(&journal->j_state_lock);

	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.
	 */
	blk_start_plug(&plug);
	err = journal_submit_data_buffers(journal, commit_transaction,
					  WRITE_SYNC);
	blk_finish_plug(&plug);

	/*
	 * Wait for all previously submitted IO to complete.
	 */
	spin_lock(&journal->j_list_lock);
	while (commit_transaction->t_locked_list) {
		struct buffer_head *bh;

		jh = commit_transaction->t_locked_list->b_tprev;
		bh = jh2bh(jh);
		get_bh(bh);
		if (buffer_locked(bh)) {
			spin_unlock(&journal->j_list_lock);
			wait_on_buffer(bh);
			spin_lock(&journal->j_list_lock);
		}
		if (unlikely(!buffer_uptodate(bh))) {
			if (!trylock_page(bh->b_page)) {
				spin_unlock(&journal->j_list_lock);
				lock_page(bh->b_page);
				spin_lock(&journal->j_list_lock);
			}
			if (bh->b_page->mapping)
				set_bit(AS_EIO, &bh->b_page->mapping->flags);

			unlock_page(bh->b_page);
			SetPageError(bh->b_page);
			err = -EIO;
		}
		if (!inverted_lock(journal, bh)) {
			put_bh(bh);
			spin_lock(&journal->j_list_lock);
			continue;
		}
		if (buffer_jbd(bh) && bh2jh(bh) == jh &&
		    jh->b_transaction == commit_transaction &&
		    jh->b_jlist == BJ_Locked)
			__journal_unfile_buffer(jh);
		jbd_unlock_bh_state(bh);
		release_data_buffer(bh);
		cond_resched_lock(&journal->j_list_lock);
	}
	spin_unlock(&journal->j_list_lock);

	if (err) {
		char b[BDEVNAME_SIZE];

		printk(KERN_WARNING
			"JBD: Detected IO errors while flushing file data "
			"on %s\n", bdevname(journal->j_fs_dev, b));
		if (journal->j_flags & JFS_ABORT_ON_SYNCDATA_ERR)
			journal_abort(journal, err);
		err = 0;
	}

	blk_start_plug(&plug);

	journal_write_revoke_records(journal, commit_transaction, WRITE_SYNC);

	/*
	 * 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);

	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:
	 */
	spin_lock(&journal->j_state_lock);
	commit_transaction->t_state = T_COMMIT;
	spin_unlock(&journal->j_state_lock);

	trace_jbd_commit_logging(journal, commit_transaction);
	J_ASSERT(commit_transaction->t_nr_buffers <=
		 commit_transaction->t_outstanding_credits);

	descriptor = NULL;
	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. */

		if (is_journal_aborted(journal)) {
			clear_buffer_jbddirty(jh2bh(jh));
			JBUFFER_TRACE(jh, "journal is aborting: refile");
			journal_refile_buffer(journal, 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(journal, -EIO);
				continue;
			}

			bh = jh2bh(descriptor);
			jbd_debug(4, "JBD: got buffer %llu (%p)\n",
				(unsigned long long)bh->b_blocknr, bh->b_data);
			header = (journal_header_t *)&bh->b_data[0];
			header->h_magic     = cpu_to_be32(JFS_MAGIC_NUMBER);
			header->h_blocktype = cpu_to_be32(JFS_DESCRIPTOR_BLOCK);
			header->h_sequence  = cpu_to_be32(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_buffer_jwrite(bh);
			set_buffer_dirty(bh);
			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(journal, err);
			continue;
		}

		/*
コード例 #16
0
ファイル: inline.c プロジェクト: shengwenhui/aufs4-linux
static int ext4_create_inline_data(handle_t *handle,
				   struct inode *inode, unsigned len)
{
	int error;
	void *value = NULL;
	struct ext4_xattr_ibody_find is = {
		.s = { .not_found = -ENODATA, },
	};
	struct ext4_xattr_info i = {
		.name_index = EXT4_XATTR_INDEX_SYSTEM,
		.name = EXT4_XATTR_SYSTEM_DATA,
	};

	error = ext4_get_inode_loc(inode, &is.iloc);
	if (error)
		return error;

	BUFFER_TRACE(is.iloc.bh, "get_write_access");
	error = ext4_journal_get_write_access(handle, is.iloc.bh);
	if (error)
		goto out;

	if (len > EXT4_MIN_INLINE_DATA_SIZE) {
		value = EXT4_ZERO_XATTR_VALUE;
		len -= EXT4_MIN_INLINE_DATA_SIZE;
	} else {
		value = "";
		len = 0;
	}

	/* Insert the the xttr entry. */
	i.value = value;
	i.value_len = len;

	error = ext4_xattr_ibody_find(inode, &i, &is);
	if (error)
		goto out;

	BUG_ON(!is.s.not_found);

	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
	if (error) {
		if (error == -ENOSPC)
			ext4_clear_inode_state(inode,
					       EXT4_STATE_MAY_INLINE_DATA);
		goto out;
	}

	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
		0, EXT4_MIN_INLINE_DATA_SIZE);

	EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
				      (void *)ext4_raw_inode(&is.iloc));
	EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
	ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
	get_bh(is.iloc.bh);
	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);

out:
	brelse(is.iloc.bh);
	return error;
}
コード例 #17
0
ファイル: ialloc.c プロジェクト: GodFox/magx_kernel_xpixl
/*
 * There are two policies for allocating an inode.  If the new inode is
 * a directory, then a forward search is made for a block group with both
 * free space and a low directory-to-inode ratio; if that fails, then of
 * the groups with above-average free space, that group with the fewest
 * directories already is chosen.
 *
 * For other inodes, search forward from the parent directory's block
 * group to find a free inode.
 */
struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
{
	struct super_block *sb;
	struct buffer_head *bitmap_bh = NULL;
	struct buffer_head *bh2;
	int group;
	unsigned long ino = 0;
	struct inode * inode;
	struct ext3_group_desc * gdp = NULL;
	struct ext3_super_block * es;
	struct ext3_inode_info *ei;
	struct ext3_sb_info *sbi;
	int err = 0;
	struct inode *ret;
	int i;

	/* Cannot create files in a deleted directory */
	if (!dir || !dir->i_nlink)
		return ERR_PTR(-EPERM);

	sb = dir->i_sb;
	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	ei = EXT3_I(inode);

	sbi = EXT3_SB(sb);
	es = sbi->s_es;
	if (S_ISDIR(mode)) {
		if (test_opt (sb, OLDALLOC))
			group = find_group_dir(sb, dir);
		else
			group = find_group_orlov(sb, dir);
	} else 
		group = find_group_other(sb, dir);

	err = -ENOSPC;
	if (group == -1)
		goto out;

	for (i = 0; i < sbi->s_groups_count; i++) {
		gdp = ext3_get_group_desc(sb, group, &bh2);

		err = -EIO;
		brelse(bitmap_bh);
		bitmap_bh = read_inode_bitmap(sb, group);
		if (!bitmap_bh)
			goto fail;

		ino = 0;

repeat_in_this_group:
		ino = ext3_find_next_zero_bit((unsigned long *)
				bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
		if (ino < EXT3_INODES_PER_GROUP(sb)) {
			int credits = 0;

			BUFFER_TRACE(bitmap_bh, "get_write_access");
			err = ext3_journal_get_write_access_credits(handle,
							bitmap_bh, &credits);
			if (err)
				goto fail;

			if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
						ino, bitmap_bh->b_data)) {
				/* we won it */
				BUFFER_TRACE(bitmap_bh,
					"call ext3_journal_dirty_metadata");
				err = ext3_journal_dirty_metadata(handle,
								bitmap_bh);
				if (err)
					goto fail;
				goto got;
			}
			/* we lost it */
			journal_release_buffer(handle, bitmap_bh, credits);

			if (++ino < EXT3_INODES_PER_GROUP(sb))
				goto repeat_in_this_group;
		}

		/*
		 * This case is possible in concurrent environment.  It is very
		 * rare.  We cannot repeat the find_group_xxx() call because
		 * that will simply return the same blockgroup, because the
		 * group descriptor metadata has not yet been updated.
		 * So we just go onto the next blockgroup.
		 */
		if (++group == sbi->s_groups_count)
			group = 0;
	}
	err = -ENOSPC;
	goto out;

got:
	ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
	if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_new_inode",
			    "reserved inode or inode > inodes count - "
			    "block_group = %d, inode=%lu", group, ino);
		err = -EIO;
		goto fail;
	}

	BUFFER_TRACE(bh2, "get_write_access");
	err = ext3_journal_get_write_access(handle, bh2);
	if (err) goto fail;
	spin_lock(sb_bgl_lock(sbi, group));
	gdp->bg_free_inodes_count =
		cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
	if (S_ISDIR(mode)) {
		gdp->bg_used_dirs_count =
			cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
	}
	spin_unlock(sb_bgl_lock(sbi, group));
	BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bh2);
	if (err) goto fail;

	percpu_counter_dec(&sbi->s_freeinodes_counter);
	if (S_ISDIR(mode))
		percpu_counter_inc(&sbi->s_dirs_counter);
	sb->s_dirt = 1;

	inode->i_uid = current->fsuid;
	if (test_opt (sb, GRPID))
		inode->i_gid = dir->i_gid;
	else if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else
		inode->i_gid = current->fsgid;
	inode->i_mode = mode;

	inode->i_ino = ino;
	/* This is the optimal IO size (for stat), not the fs block size */
	inode->i_blksize = PAGE_SIZE;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;

	memset(ei->i_data, 0, sizeof(ei->i_data));
	ei->i_next_alloc_block = 0;
	ei->i_next_alloc_goal = 0;
	ei->i_dir_start_lookup = 0;
	ei->i_disksize = 0;

	ei->i_flags = EXT3_I(dir)->i_flags & ~EXT3_INDEX_FL;
	if (S_ISLNK(mode))
		ei->i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL);
	/* dirsync only applies to directories */
	if (!S_ISDIR(mode))
		ei->i_flags &= ~EXT3_DIRSYNC_FL;
#ifdef EXT3_FRAGMENTS
	ei->i_faddr = 0;
	ei->i_frag_no = 0;
	ei->i_frag_size = 0;
#endif
	ei->i_file_acl = 0;
	ei->i_dir_acl = 0;
	ei->i_dtime = 0;
	ei->i_rsv_window.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
	ei->i_rsv_window.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
	atomic_set(&ei->i_rsv_window.rsv_goal_size, EXT3_DEFAULT_RESERVE_BLOCKS);
	atomic_set(&ei->i_rsv_window.rsv_alloc_hit, 0);
	seqlock_init(&ei->i_rsv_window.rsv_seqlock);
	ei->i_block_group = group;

	ext3_set_inode_flags(inode);
	if (IS_DIRSYNC(inode))
		handle->h_sync = 1;
	insert_inode_hash(inode);
	spin_lock(&sbi->s_next_gen_lock);
	inode->i_generation = sbi->s_next_generation++;
	spin_unlock(&sbi->s_next_gen_lock);

	ei->i_state = EXT3_STATE_NEW;

	ret = inode;
	if(DQUOT_ALLOC_INODE(inode)) {
		DQUOT_DROP(inode);
		err = -EDQUOT;
		goto fail2;
	}
	err = ext3_init_acl(handle, inode, dir);
	if (err) {
		DQUOT_FREE_INODE(inode);
		goto fail2;
  	}
	err = ext3_mark_inode_dirty(handle, inode);
	if (err) {
		ext3_std_error(sb, err);
		DQUOT_FREE_INODE(inode);
		goto fail2;
	}

	ext3_debug("allocating inode %lu\n", inode->i_ino);
	goto really_out;
fail:
	ext3_std_error(sb, err);
out:
	iput(inode);
	ret = ERR_PTR(err);
really_out:
	brelse(bitmap_bh);
	return ret;

fail2:
	inode->i_flags |= S_NOQUOTA;
	inode->i_nlink = 0;
	iput(inode);
	brelse(bitmap_bh);
	return ERR_PTR(err);
}
コード例 #18
0
ファイル: inline.c プロジェクト: shengwenhui/aufs4-linux
static int ext4_destroy_inline_data_nolock(handle_t *handle,
					   struct inode *inode)
{
	struct ext4_inode_info *ei = EXT4_I(inode);
	struct ext4_xattr_ibody_find is = {
		.s = { .not_found = 0, },
	};
	struct ext4_xattr_info i = {
		.name_index = EXT4_XATTR_INDEX_SYSTEM,
		.name = EXT4_XATTR_SYSTEM_DATA,
		.value = NULL,
		.value_len = 0,
	};
	int error;

	if (!ei->i_inline_off)
		return 0;

	error = ext4_get_inode_loc(inode, &is.iloc);
	if (error)
		return error;

	error = ext4_xattr_ibody_find(inode, &i, &is);
	if (error)
		goto out;

	BUFFER_TRACE(is.iloc.bh, "get_write_access");
	error = ext4_journal_get_write_access(handle, is.iloc.bh);
	if (error)
		goto out;

	error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
	if (error)
		goto out;

	memset((void *)ext4_raw_inode(&is.iloc)->i_block,
		0, EXT4_MIN_INLINE_DATA_SIZE);

	if (ext4_has_feature_extents(inode->i_sb)) {
		if (S_ISDIR(inode->i_mode) ||
		    S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
			ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
			ext4_ext_tree_init(handle, inode);
		}
	}
	ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);

	get_bh(is.iloc.bh);
	error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);

	EXT4_I(inode)->i_inline_off = 0;
	EXT4_I(inode)->i_inline_size = 0;
	ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
out:
	brelse(is.iloc.bh);
	if (error == -ENODATA)
		error = 0;
	return error;
}

static int ext4_read_inline_page(struct inode *inode, struct page *page)
{
	void *kaddr;
	int ret = 0;
	size_t len;
	struct ext4_iloc iloc;

	BUG_ON(!PageLocked(page));
	BUG_ON(!ext4_has_inline_data(inode));
	BUG_ON(page->index);

	if (!EXT4_I(inode)->i_inline_off) {
		ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
			     inode->i_ino);
		goto out;
	}

	ret = ext4_get_inode_loc(inode, &iloc);
	if (ret)
		goto out;

	len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
	kaddr = kmap_atomic(page);
	ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
	flush_dcache_page(page);
	kunmap_atomic(kaddr);
	zero_user_segment(page, len, PAGE_CACHE_SIZE);
	SetPageUptodate(page);
	brelse(iloc.bh);

out:
	return ret;
}
コード例 #19
0
static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
{
	transaction_t *transaction;
	struct journal_head *jh;
	int may_free = 1;
	int ret;

	BUFFER_TRACE(bh, "entry");


	if (!buffer_jbd(bh))
		goto zap_buffer_unlocked;

	
	write_lock(&journal->j_state_lock);
	jbd_lock_bh_state(bh);
	spin_lock(&journal->j_list_lock);

	jh = jbd2_journal_grab_journal_head(bh);
	if (!jh)
		goto zap_buffer_no_jh;

	transaction = jh->b_transaction;
	if (transaction == NULL) {
		if (!jh->b_cp_transaction) {
			JBUFFER_TRACE(jh, "not on any transaction: zap");
			goto zap_buffer;
		}

		if (!buffer_dirty(bh)) {
			
			goto zap_buffer;
		}


		if (journal->j_running_transaction) {
			JBUFFER_TRACE(jh, "checkpointed: add to BJ_Forget");
			ret = __dispose_buffer(jh,
					journal->j_running_transaction);
			jbd2_journal_put_journal_head(jh);
			spin_unlock(&journal->j_list_lock);
			jbd_unlock_bh_state(bh);
			write_unlock(&journal->j_state_lock);
			return ret;
		} else {
			if (journal->j_committing_transaction) {
				JBUFFER_TRACE(jh, "give to committing trans");
				ret = __dispose_buffer(jh,
					journal->j_committing_transaction);
				jbd2_journal_put_journal_head(jh);
				spin_unlock(&journal->j_list_lock);
				jbd_unlock_bh_state(bh);
				write_unlock(&journal->j_state_lock);
				return ret;
			} else {
				clear_buffer_jbddirty(bh);
				goto zap_buffer;
			}
		}
	} else if (transaction == journal->j_committing_transaction) {
		JBUFFER_TRACE(jh, "on committing transaction");
		set_buffer_freed(bh);
		if (journal->j_running_transaction && buffer_jbddirty(bh))
			jh->b_next_transaction = journal->j_running_transaction;
		jbd2_journal_put_journal_head(jh);
		spin_unlock(&journal->j_list_lock);
		jbd_unlock_bh_state(bh);
		write_unlock(&journal->j_state_lock);
		return 0;
	} else {
		J_ASSERT_JH(jh, transaction == journal->j_running_transaction);
		JBUFFER_TRACE(jh, "on running transaction");
		may_free = __dispose_buffer(jh, transaction);
	}

zap_buffer:
	jbd2_journal_put_journal_head(jh);
zap_buffer_no_jh:
	spin_unlock(&journal->j_list_lock);
	jbd_unlock_bh_state(bh);
	write_unlock(&journal->j_state_lock);
zap_buffer_unlocked:
	clear_buffer_dirty(bh);
	J_ASSERT_BH(bh, !buffer_jbddirty(bh));
	clear_buffer_mapped(bh);
	clear_buffer_req(bh);
	clear_buffer_new(bh);
	clear_buffer_delay(bh);
	clear_buffer_unwritten(bh);
	bh->b_bdev = NULL;
	return may_free;
}
コード例 #20
0
ファイル: ialloc.c プロジェクト: 303750856/linux-3.1
/*
 * There are two policies for allocating an inode.  If the new inode is
 * a directory, then a forward search is made for a block group with both
 * free space and a low directory-to-inode ratio; if that fails, then of
 * the groups with above-average free space, that group with the fewest
 * directories already is chosen.
 *
 * For other inodes, search forward from the parent directory's block
 * group to find a free inode.
 */
struct inode *ext3_new_inode(handle_t *handle, struct inode * dir,
			     const struct qstr *qstr, int mode)
{
	struct super_block *sb;
	struct buffer_head *bitmap_bh = NULL;
	struct buffer_head *bh2;
	int group;
	unsigned long ino = 0;
	struct inode * inode;
	struct ext3_group_desc * gdp = NULL;
	struct ext3_super_block * es;
	struct ext3_inode_info *ei;
	struct ext3_sb_info *sbi;
	int err = 0;
	struct inode *ret;
	int i;

	/* Cannot create files in a deleted directory */
	if (!dir || !dir->i_nlink)
		return ERR_PTR(-EPERM);

	sb = dir->i_sb;
	trace_ext3_request_inode(dir, mode);
	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	ei = EXT3_I(inode);

	sbi = EXT3_SB(sb);
	es = sbi->s_es;
	if (S_ISDIR(mode)) {
		if (test_opt (sb, OLDALLOC))
			group = find_group_dir(sb, dir);
		else
			group = find_group_orlov(sb, dir);
	} else
		group = find_group_other(sb, dir);

	err = -ENOSPC;
	if (group == -1)
		goto out;

	for (i = 0; i < sbi->s_groups_count; i++) {
		err = -EIO;

		gdp = ext3_get_group_desc(sb, group, &bh2);
		if (!gdp)
			goto fail;

		brelse(bitmap_bh);
		bitmap_bh = read_inode_bitmap(sb, group);
		if (!bitmap_bh)
			goto fail;

		ino = 0;

repeat_in_this_group:
		ino = ext3_find_next_zero_bit((unsigned long *)
				bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
		if (ino < EXT3_INODES_PER_GROUP(sb)) {

			BUFFER_TRACE(bitmap_bh, "get_write_access");
			err = ext3_journal_get_write_access(handle, bitmap_bh);
			if (err)
				goto fail;

			if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
						ino, bitmap_bh->b_data)) {
				/* we won it */
				BUFFER_TRACE(bitmap_bh,
					"call ext3_journal_dirty_metadata");
				err = ext3_journal_dirty_metadata(handle,
								bitmap_bh);
				if (err)
					goto fail;
				goto got;
			}
			/* we lost it */
			journal_release_buffer(handle, bitmap_bh);

			if (++ino < EXT3_INODES_PER_GROUP(sb))
				goto repeat_in_this_group;
		}

		/*
		 * This case is possible in concurrent environment.  It is very
		 * rare.  We cannot repeat the find_group_xxx() call because
		 * that will simply return the same blockgroup, because the
		 * group descriptor metadata has not yet been updated.
		 * So we just go onto the next blockgroup.
		 */
		if (++group == sbi->s_groups_count)
			group = 0;
	}
	err = -ENOSPC;
	goto out;

got:
	ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
	if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_new_inode",
			    "reserved inode or inode > inodes count - "
			    "block_group = %d, inode=%lu", group, ino);
		err = -EIO;
		goto fail;
	}

	BUFFER_TRACE(bh2, "get_write_access");
	err = ext3_journal_get_write_access(handle, bh2);
	if (err) goto fail;
	spin_lock(sb_bgl_lock(sbi, group));
	le16_add_cpu(&gdp->bg_free_inodes_count, -1);
	if (S_ISDIR(mode)) {
		le16_add_cpu(&gdp->bg_used_dirs_count, 1);
	}
	spin_unlock(sb_bgl_lock(sbi, group));
	BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bh2);
	if (err) goto fail;

	percpu_counter_dec(&sbi->s_freeinodes_counter);
	if (S_ISDIR(mode))
		percpu_counter_inc(&sbi->s_dirs_counter);


	if (test_opt(sb, GRPID)) {
		inode->i_mode = mode;
		inode->i_uid = current_fsuid();
		inode->i_gid = dir->i_gid;
	} else
		inode_init_owner(inode, dir, mode);

	inode->i_ino = ino;
	/* This is the optimal IO size (for stat), not the fs block size */
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;

	memset(ei->i_data, 0, sizeof(ei->i_data));
	ei->i_dir_start_lookup = 0;
	ei->i_disksize = 0;

	ei->i_flags =
		ext3_mask_flags(mode, EXT3_I(dir)->i_flags & EXT3_FL_INHERITED);
#ifdef EXT3_FRAGMENTS
	ei->i_faddr = 0;
	ei->i_frag_no = 0;
	ei->i_frag_size = 0;
#endif
	ei->i_file_acl = 0;
	ei->i_dir_acl = 0;
	ei->i_dtime = 0;
	ei->i_block_alloc_info = NULL;
	ei->i_block_group = group;

	ext3_set_inode_flags(inode);
	if (IS_DIRSYNC(inode))
		handle->h_sync = 1;
	if (insert_inode_locked(inode) < 0) {
		err = -EINVAL;
		goto fail_drop;
	}
	spin_lock(&sbi->s_next_gen_lock);
	inode->i_generation = sbi->s_next_generation++;
	spin_unlock(&sbi->s_next_gen_lock);

	ei->i_state_flags = 0;
	ext3_set_inode_state(inode, EXT3_STATE_NEW);

	/* See comment in ext3_iget for explanation */
	if (ino >= EXT3_FIRST_INO(sb) + 1 &&
	    EXT3_INODE_SIZE(sb) > EXT3_GOOD_OLD_INODE_SIZE) {
		ei->i_extra_isize =
			sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE;
	} else {
		ei->i_extra_isize = 0;
	}

	ret = inode;
	dquot_initialize(inode);
	err = dquot_alloc_inode(inode);
	if (err)
		goto fail_drop;

	err = ext3_init_acl(handle, inode, dir);
	if (err)
		goto fail_free_drop;

	err = ext3_init_security(handle, inode, dir, qstr);
	if (err)
		goto fail_free_drop;

	err = ext3_mark_inode_dirty(handle, inode);
	if (err) {
		ext3_std_error(sb, err);
		goto fail_free_drop;
	}

	ext3_debug("allocating inode %lu\n", inode->i_ino);
	trace_ext3_allocate_inode(inode, dir, mode);
	goto really_out;
fail:
	ext3_std_error(sb, err);
out:
	iput(inode);
	ret = ERR_PTR(err);
really_out:
	brelse(bitmap_bh);
	return ret;

fail_free_drop:
	dquot_free_inode(inode);

fail_drop:
	dquot_drop(inode);
	inode->i_flags |= S_NOQUOTA;
	inode->i_nlink = 0;
	unlock_new_inode(inode);
	iput(inode);
	brelse(bitmap_bh);
	return ERR_PTR(err);
}
コード例 #21
0
void
jbd2_journal_release_buffer(handle_t *handle, struct buffer_head *bh)
{
	BUFFER_TRACE(bh, "entry");
}
コード例 #22
0
static int do_one_pass(journal_t *journal,
			struct recovery_info *info, enum passtype pass)
{
	unsigned int		first_commit_ID, next_commit_ID;
	unsigned long long	next_log_block;
	int			err, success = 0;
	journal_superblock_t *	sb;
	journal_header_t *	tmp;
	struct buffer_head *	bh;
	unsigned int		sequence;
	int			blocktype;
	int			tag_bytes = journal_tag_bytes(journal);
	__u32			crc32_sum = ~0; /* Transactional Checksums */

	/* Precompute the maximum metadata descriptors in a descriptor block */
	int			MAX_BLOCKS_PER_DESC;
	MAX_BLOCKS_PER_DESC = ((journal->j_blocksize-sizeof(journal_header_t))
			       / tag_bytes);

	/*
	 * First thing is to establish what we expect to find in the log
	 * (in terms of transaction IDs), and where (in terms of log
	 * block offsets): query the superblock.
	 */

	sb = journal->j_superblock;
	next_commit_ID = be32_to_cpu(sb->s_sequence);
	next_log_block = be32_to_cpu(sb->s_start);

	first_commit_ID = next_commit_ID;
	if (pass == PASS_SCAN)
		info->start_transaction = first_commit_ID;

	jbd_debug(1, "Starting recovery pass %d\n", pass);

	/*
	 * Now we walk through the log, transaction by transaction,
	 * making sure that each transaction has a commit block in the
	 * expected place.  Each complete transaction gets replayed back
	 * into the main filesystem.
	 */

	while (1) {
		int			flags;
		char *			tagp;
		journal_block_tag_t *	tag;
		struct buffer_head *	obh;
		struct buffer_head *	nbh;

		cond_resched();

		/* If we already know where to stop the log traversal,
		 * check right now that we haven't gone past the end of
		 * the log. */

		if (pass != PASS_SCAN)
			if (tid_geq(next_commit_ID, info->end_transaction))
				break;

		jbd_debug(2, "Scanning for sequence ID %u at %lu/%lu\n",
			  next_commit_ID, next_log_block, journal->j_last);

		/* Skip over each chunk of the transaction looking
		 * either the next descriptor block or the final commit
		 * record. */

		jbd_debug(3, "JBD: checking block %ld\n", next_log_block);
		err = jread(&bh, journal, next_log_block);
		if (err)
			goto failed;

		next_log_block++;
		wrap(journal, next_log_block);

		/* What kind of buffer is it?
		 *
		 * If it is a descriptor block, check that it has the
		 * expected sequence number.  Otherwise, we're all done
		 * here. */

		tmp = (journal_header_t *)bh->b_data;

		if (tmp->h_magic != cpu_to_be32(JFS_MAGIC_NUMBER)) {
			brelse(bh);
			break;
		}

		blocktype = be32_to_cpu(tmp->h_blocktype);
		sequence = be32_to_cpu(tmp->h_sequence);
		jbd_debug(3, "Found magic %d, sequence %d\n",
			  blocktype, sequence);

		if (sequence != next_commit_ID) {
			brelse(bh);
			break;
		}

		/* OK, we have a valid descriptor block which matches
		 * all of the sequence number checks.  What are we going
		 * to do with it?  That depends on the pass... */

		switch(blocktype) {
		case JFS_DESCRIPTOR_BLOCK:
			/* If it is a valid descriptor block, replay it
			 * in pass REPLAY; if journal_checksums enabled, then
			 * calculate checksums in PASS_SCAN, otherwise,
			 * just skip over the blocks it describes. */
			if (pass != PASS_REPLAY) {
				if (pass == PASS_SCAN &&
				    JFS_HAS_COMPAT_FEATURE(journal,
					    JFS_FEATURE_COMPAT_CHECKSUM) &&
				    !info->end_transaction) {
					if (calc_chksums(journal, bh,
							&next_log_block,
							&crc32_sum)) {
						brelse(bh);
						break;
					}
					brelse(bh);
					continue;
				}
				next_log_block += count_tags(journal, bh);
				wrap(journal, next_log_block);
				brelse(bh);
				continue;
			}

			/* A descriptor block: we can now write all of
			 * the data blocks.  Yay, useful work is finally
			 * getting done here! */

			tagp = &bh->b_data[sizeof(journal_header_t)];
			while ((tagp - bh->b_data + tag_bytes)
			       <= journal->j_blocksize) {
				unsigned long long io_block;

				tag = (journal_block_tag_t *) tagp;
				flags = be32_to_cpu(tag->t_flags);

				io_block = next_log_block++;
				wrap(journal, next_log_block);
				err = jread(&obh, journal, io_block);
				if (err) {
					/* Recover what we can, but
					 * report failure at the end. */
					success = err;
					printk (KERN_ERR
						"JBD: IO error %d recovering "
						"block %llu in log\n",
						err, io_block);
				} else {
					unsigned long long blocknr;

					J_ASSERT(obh != NULL);
					blocknr = read_tag_block(tag_bytes,
								 tag);

					/* If the block has been
					 * revoked, then we're all done
					 * here. */
					if (journal_test_revoke
					    (journal, blocknr,
					     next_commit_ID)) {
						brelse(obh);
						++info->nr_revoke_hits;
						goto skip_write;
					}

					/* Find a buffer for the new
					 * data being restored */
					nbh = __getblk(journal->j_fs_dev,
							blocknr,
							journal->j_blocksize);
					if (nbh == NULL) {
						printk(KERN_ERR
						       "JBD: Out of memory "
						       "during recovery.\n");
						err = -ENOMEM;
						brelse(bh);
						brelse(obh);
						goto failed;
					}

					lock_buffer(nbh);
					memcpy(nbh->b_data, obh->b_data,
							journal->j_blocksize);
					if (flags & JFS_FLAG_ESCAPE) {
						journal_header_t *header;

						header = (journal_header_t *) &nbh->b_data[0];
						header->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER);
					}

					BUFFER_TRACE(nbh, "marking dirty");
					set_buffer_uptodate(nbh);
					mark_buffer_dirty(nbh);
					BUFFER_TRACE(nbh, "marking uptodate");
					++info->nr_replays;
					/* ll_rw_block(WRITE, 1, &nbh); */
					unlock_buffer(nbh);
					brelse(obh);
					brelse(nbh);
				}

			skip_write:
				tagp += tag_bytes;
				if (!(flags & JFS_FLAG_SAME_UUID))
					tagp += 16;

				if (flags & JFS_FLAG_LAST_TAG)
					break;
			}

			brelse(bh);
			continue;

		case JFS_COMMIT_BLOCK:
			jbd_debug(3, "Commit block for #%u found\n",
				  next_commit_ID);
			/*     How to differentiate between interrupted commit
			 *               and journal corruption ?
			 *
			 * {nth transaction}
			 *        Checksum Verification Failed
			 *			 |
			 *		 ____________________
			 *		|		     |
			 * 	async_commit             sync_commit
			 *     		|                    |
			 *		| GO TO NEXT    "Journal Corruption"
			 *		| TRANSACTION
			 *		|
			 * {(n+1)th transanction}
			 *		|
			 * 	 _______|______________
			 * 	|	 	      |
			 * Commit block found	Commit block not found
			 *      |		      |
			 * "Journal Corruption"       |
			 *		 _____________|_________
			 *     		|	           	|
			 *	nth trans corrupt	OR   nth trans
			 *	and (n+1)th interrupted     interrupted
			 *	before commit block
			 *      could reach the disk.
			 *	(Cannot find the difference in above
			 *	 mentioned conditions. Hence assume
			 *	 "Interrupted Commit".)
			 */

			/* Found an expected commit block: if checksums
			 * are present verify them in PASS_SCAN; else not
			 * much to do other than move on to the next sequence
			 * number. */
			if (pass == PASS_SCAN &&
			    JFS_HAS_COMPAT_FEATURE(journal,
				    JFS_FEATURE_COMPAT_CHECKSUM)) {
				int chksum_err, chksum_seen;
				struct commit_header *cbh =
					(struct commit_header *)bh->b_data;
				unsigned found_chksum =
					be32_to_cpu(cbh->h_chksum[0]);

				chksum_err = chksum_seen = 0;

				jbd_debug(3, "Checksums %x %x\n",
					  crc32_sum, found_chksum);
				if (info->end_transaction) {
					journal->j_failed_commit =
						info->end_transaction;
					brelse(bh);
					break;
				}

				if (crc32_sum == found_chksum &&
				    cbh->h_chksum_type == JBD2_CRC32_CHKSUM &&
				    cbh->h_chksum_size ==
						JBD2_CRC32_CHKSUM_SIZE)
				       chksum_seen = 1;
				else if (!(cbh->h_chksum_type == 0 &&
					     cbh->h_chksum_size == 0 &&
					     found_chksum == 0 &&
					     !chksum_seen))
				/*
				 * If fs is mounted using an old kernel and then
				 * kernel with journal_chksum is used then we
				 * get a situation where the journal flag has
				 * checksum flag set but checksums are not
				 * present i.e chksum = 0, in the individual
				 * commit blocks.
				 * Hence to avoid checksum failures, in this
				 * situation, this extra check is added.
				 */
						chksum_err = 1;

				if (chksum_err) {
					info->end_transaction = next_commit_ID;
					jbd_debug(1, "Checksum_err %x %x\n",
						  crc32_sum, found_chksum);
					if (!JFS_HAS_INCOMPAT_FEATURE(journal,
					   JFS_FEATURE_INCOMPAT_ASYNC_COMMIT)){
						journal->j_failed_commit =
							next_commit_ID;
						brelse(bh);
						break;
					}
				}
				crc32_sum = ~0;
			}
			brelse(bh);
			next_commit_ID++;
			continue;

		case JFS_REVOKE_BLOCK:
			/* If we aren't in the REVOKE pass, then we can
			 * just skip over this block. */
			if (pass != PASS_REVOKE) {
				brelse(bh);
				continue;
			}

			err = scan_revoke_records(journal, bh,
						  next_commit_ID, info);
			brelse(bh);
			if (err)
				goto failed;
			continue;

		default:
			jbd_debug(3, "Unrecognised magic %d, end of scan.\n",
				  blocktype);
			brelse(bh);
			goto done;
		}
	}

 done:
	/*
	 * We broke out of the log scan loop: either we came to the
	 * known end of the log or we found an unexpected block in the
	 * log.  If the latter happened, then we know that the "current"
	 * transaction marks the end of the valid log.
	 */

	if (pass == PASS_SCAN) {
		if (!info->end_transaction)
			info->end_transaction = next_commit_ID;
	} else {
		/* It's really bad news if different passes end up at
		 * different places (but possible due to IO errors). */
		if (info->end_transaction != next_commit_ID) {
			printk (KERN_ERR "JBD: recovery pass %d ended at "
				"transaction %u, expected %u\n",
				pass, next_commit_ID, info->end_transaction);
			if (!success)
				success = -EIO;
		}
	}

	return success;

 failed:
	return err;
}
コード例 #23
0
int jbd2_journal_forget (handle_t *handle, struct buffer_head *bh)
{
	transaction_t *transaction = handle->h_transaction;
	journal_t *journal = transaction->t_journal;
	struct journal_head *jh;
	int drop_reserve = 0;
	int err = 0;
	int was_modified = 0;

	BUFFER_TRACE(bh, "entry");

	jbd_lock_bh_state(bh);
	spin_lock(&journal->j_list_lock);

	if (!buffer_jbd(bh))
		goto not_jbd;
	jh = bh2jh(bh);

	if (!J_EXPECT_JH(jh, !jh->b_committed_data,
			 "inconsistent data on disk")) {
		err = -EIO;
		goto not_jbd;
	}

	
	was_modified = jh->b_modified;

	jh->b_modified = 0;

	if (jh->b_transaction == handle->h_transaction) {
		J_ASSERT_JH(jh, !jh->b_frozen_data);

		clear_buffer_dirty(bh);
		clear_buffer_jbddirty(bh);

		JBUFFER_TRACE(jh, "belongs to current transaction: unfile");

		if (was_modified)
			drop_reserve = 1;


		if (jh->b_cp_transaction) {
			__jbd2_journal_temp_unlink_buffer(jh);
			__jbd2_journal_file_buffer(jh, transaction, BJ_Forget);
		} else {
			__jbd2_journal_unfile_buffer(jh);
			if (!buffer_jbd(bh)) {
				spin_unlock(&journal->j_list_lock);
				jbd_unlock_bh_state(bh);
				__bforget(bh);
				goto drop;
			}
		}
	} else if (jh->b_transaction) {
		J_ASSERT_JH(jh, (jh->b_transaction ==
				 journal->j_committing_transaction));
		JBUFFER_TRACE(jh, "belongs to older transaction");

		if (jh->b_next_transaction) {
			J_ASSERT(jh->b_next_transaction == transaction);
			jh->b_next_transaction = NULL;

			if (was_modified)
				drop_reserve = 1;
		}
	}

not_jbd:
	spin_unlock(&journal->j_list_lock);
	jbd_unlock_bh_state(bh);
	__brelse(bh);
drop:
	if (drop_reserve) {
		
		handle->h_buffer_credits++;
	}
	return err;
}
コード例 #24
0
ファイル: recovery.c プロジェクト: CSCLOG/beaglebone
static int do_one_pass(journal_t *journal,
			struct recovery_info *info, enum passtype pass)
{
	unsigned int		first_commit_ID, next_commit_ID;
	unsigned int		next_log_block;
	int			err, success = 0;
	journal_superblock_t *	sb;
	journal_header_t *	tmp;
	struct buffer_head *	bh;
	unsigned int		sequence;
	int			blocktype;

	/*
	 * First thing is to establish what we expect to find in the log
	 * (in terms of transaction IDs), and where (in terms of log
	 * block offsets): query the superblock.
	 */

	sb = journal->j_superblock;
	next_commit_ID = be32_to_cpu(sb->s_sequence);
	next_log_block = be32_to_cpu(sb->s_start);

	first_commit_ID = next_commit_ID;
	if (pass == PASS_SCAN)
		info->start_transaction = first_commit_ID;

	jbd_debug(1, "Starting recovery pass %d\n", pass);

	/*
	 * Now we walk through the log, transaction by transaction,
	 * making sure that each transaction has a commit block in the
	 * expected place.  Each complete transaction gets replayed back
	 * into the main filesystem.
	 */

	while (1) {
		int			flags;
		char *			tagp;
		journal_block_tag_t *	tag;
		struct buffer_head *	obh;
		struct buffer_head *	nbh;

		cond_resched();

		/* If we already know where to stop the log traversal,
		 * check right now that we haven't gone past the end of
		 * the log. */

		if (pass != PASS_SCAN)
			if (tid_geq(next_commit_ID, info->end_transaction))
				break;

		jbd_debug(2, "Scanning for sequence ID %u at %u/%u\n",
			  next_commit_ID, next_log_block, journal->j_last);

		/* Skip over each chunk of the transaction looking
		 * either the next descriptor block or the final commit
		 * record. */

		jbd_debug(3, "JBD: checking block %u\n", next_log_block);
		err = jread(&bh, journal, next_log_block);
		if (err)
			goto failed;

		next_log_block++;
		wrap(journal, next_log_block);

		/* What kind of buffer is it?
		 *
		 * If it is a descriptor block, check that it has the
		 * expected sequence number.  Otherwise, we're all done
		 * here. */

		tmp = (journal_header_t *)bh->b_data;

		if (tmp->h_magic != cpu_to_be32(JFS_MAGIC_NUMBER)) {
			brelse(bh);
			break;
		}

		blocktype = be32_to_cpu(tmp->h_blocktype);
		sequence = be32_to_cpu(tmp->h_sequence);
		jbd_debug(3, "Found magic %d, sequence %d\n",
			  blocktype, sequence);

		if (sequence != next_commit_ID) {
			brelse(bh);
			break;
		}

		/* OK, we have a valid descriptor block which matches
		 * all of the sequence number checks.  What are we going
		 * to do with it?  That depends on the pass... */

		switch(blocktype) {
		case JFS_DESCRIPTOR_BLOCK:
			/* If it is a valid descriptor block, replay it
			 * in pass REPLAY; otherwise, just skip over the
			 * blocks it describes. */
			if (pass != PASS_REPLAY) {
				next_log_block +=
					count_tags(bh, journal->j_blocksize);
				wrap(journal, next_log_block);
				brelse(bh);
				continue;
			}

			/* A descriptor block: we can now write all of
			 * the data blocks.  Yay, useful work is finally
			 * getting done here! */

			tagp = &bh->b_data[sizeof(journal_header_t)];
			while ((tagp - bh->b_data +sizeof(journal_block_tag_t))
			       <= journal->j_blocksize) {
				unsigned int io_block;

				tag = (journal_block_tag_t *) tagp;
				flags = be32_to_cpu(tag->t_flags);

				io_block = next_log_block++;
				wrap(journal, next_log_block);
				err = jread(&obh, journal, io_block);
				if (err) {
					/* Recover what we can, but
					 * report failure at the end. */
					success = err;
					printk (KERN_ERR
						"JBD: IO error %d recovering "
						"block %u in log\n",
						err, io_block);
				} else {
					unsigned int blocknr;

					J_ASSERT(obh != NULL);
					blocknr = be32_to_cpu(tag->t_blocknr);

					/* If the block has been
					 * revoked, then we're all done
					 * here. */
					if (journal_test_revoke
					    (journal, blocknr,
					     next_commit_ID)) {
						brelse(obh);
						++info->nr_revoke_hits;
						goto skip_write;
					}

					/* Find a buffer for the new
					 * data being restored */
					nbh = __getblk(journal->j_fs_dev,
							blocknr,
							journal->j_blocksize);
					if (nbh == NULL) {
						printk(KERN_ERR
						       "JBD: Out of memory "
						       "during recovery.\n");
						err = -ENOMEM;
						brelse(bh);
						brelse(obh);
						goto failed;
					}

					lock_buffer(nbh);
					memcpy(nbh->b_data, obh->b_data,
							journal->j_blocksize);
					if (flags & JFS_FLAG_ESCAPE) {
						*((__be32 *)nbh->b_data) =
						cpu_to_be32(JFS_MAGIC_NUMBER);
					}

					BUFFER_TRACE(nbh, "marking dirty");
					set_buffer_uptodate(nbh);
					mark_buffer_dirty(nbh);
					BUFFER_TRACE(nbh, "marking uptodate");
					++info->nr_replays;
					/* ll_rw_block(WRITE, 1, &nbh); */
					unlock_buffer(nbh);
					brelse(obh);
					brelse(nbh);
				}

			skip_write:
				tagp += sizeof(journal_block_tag_t);
				if (!(flags & JFS_FLAG_SAME_UUID))
					tagp += 16;

				if (flags & JFS_FLAG_LAST_TAG)
					break;
			}

			brelse(bh);
			continue;

		case JFS_COMMIT_BLOCK:
			/* Found an expected commit block: not much to
			 * do other than move on to the next sequence
			 * number. */
			brelse(bh);
			next_commit_ID++;
			continue;

		case JFS_REVOKE_BLOCK:
			/* If we aren't in the REVOKE pass, then we can
			 * just skip over this block. */
			if (pass != PASS_REVOKE) {
				brelse(bh);
				continue;
			}

			err = scan_revoke_records(journal, bh,
						  next_commit_ID, info);
			brelse(bh);
			if (err)
				goto failed;
			continue;

		default:
			jbd_debug(3, "Unrecognised magic %d, end of scan.\n",
				  blocktype);
			brelse(bh);
			goto done;
		}
	}

 done:
	/*
	 * We broke out of the log scan loop: either we came to the
	 * known end of the log or we found an unexpected block in the
	 * log.  If the latter happened, then we know that the "current"
	 * transaction marks the end of the valid log.
	 */

	if (pass == PASS_SCAN)
		info->end_transaction = next_commit_ID;
	else {
		/* It's really bad news if different passes end up at
		 * different places (but possible due to IO errors). */
		if (info->end_transaction != next_commit_ID) {
			printk (KERN_ERR "JBD: recovery pass %d ended at "
				"transaction %u, expected %u\n",
				pass, next_commit_ID, info->end_transaction);
			if (!success)
				success = -EIO;
		}
	}

	return success;

 failed:
	return err;
}
コード例 #25
0
ファイル: revoke.c プロジェクト: Mr-Aloof/wl500g
int jbd2_journal_revoke(handle_t *handle, unsigned long long blocknr,
		   struct buffer_head *bh_in)
{
	struct buffer_head *bh = NULL;
	journal_t *journal;
	struct block_device *bdev;
	int err;

	might_sleep();
	if (bh_in)
		BUFFER_TRACE(bh_in, "enter");

	journal = handle->h_transaction->t_journal;
	if (!jbd2_journal_set_features(journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)){
		J_ASSERT (!"Cannot set revoke feature!");
		return -EINVAL;
	}

	bdev = journal->j_fs_dev;
	bh = bh_in;

	if (!bh) {
		bh = __find_get_block(bdev, blocknr, journal->j_blocksize);
		if (bh)
			BUFFER_TRACE(bh, "found on hash");
	}
#ifdef JBD2_EXPENSIVE_CHECKING
	else {
		struct buffer_head *bh2;

		/* If there is a different buffer_head lying around in
		 * memory anywhere... */
		bh2 = __find_get_block(bdev, blocknr, journal->j_blocksize);
		if (bh2) {
			/* ... and it has RevokeValid status... */
			if (bh2 != bh && buffer_revokevalid(bh2))
				/* ...then it better be revoked too,
				 * since it's illegal to create a revoke
				 * record against a buffer_head which is
				 * not marked revoked --- that would
				 * risk missing a subsequent revoke
				 * cancel. */
				J_ASSERT_BH(bh2, buffer_revoked(bh2));
			put_bh(bh2);
		}
	}
#endif

	/* We really ought not ever to revoke twice in a row without
           first having the revoke cancelled: it's illegal to free a
           block twice without allocating it in between! */
	if (bh) {
		if (!J_EXPECT_BH(bh, !buffer_revoked(bh),
				 "inconsistent data on disk")) {
			if (!bh_in)
				brelse(bh);
			return -EIO;
		}
		set_buffer_revoked(bh);
		set_buffer_revokevalid(bh);
		if (bh_in) {
			BUFFER_TRACE(bh_in, "call jbd2_journal_forget");
			jbd2_journal_forget(handle, bh_in);
		} else {
			BUFFER_TRACE(bh, "call brelse");
			__brelse(bh);
		}
	}

	jbd_debug(2, "insert revoke for block %llu, bh_in=%p\n",blocknr, bh_in);
	err = insert_revoke_hash(journal, blocknr,
				handle->h_transaction->t_tid);
	BUFFER_TRACE(bh_in, "exit");
	return err;
}
コード例 #26
0
ファイル: commit.c プロジェクト: markosilla/linux-raspberry
/*
 * 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 buffer_head **wbuf = journal->j_wbuf;
    int bufs;
    int flags;
    int err;
    unsigned int blocknr;
    ktime_t start_time;
    u64 commit_time;
    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;
    struct blk_plug plug;
    int write_op = WRITE;

    /*
     * First job: lock down the current transaction and wait for
     * all outstanding updates to complete.
     */

    /* 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");
        mutex_lock(&journal->j_checkpoint_mutex);
        /*
         * We hold j_checkpoint_mutex so tail cannot change under us.
         * We don't need any special data guarantees for writing sb
         * since journal is empty and it is ok for write to be
         * flushed only with transaction commit.
         */
        journal_update_sb_log_tail(journal, journal->j_tail_sequence,
                                   journal->j_tail, WRITE_SYNC);
        mutex_unlock(&journal->j_checkpoint_mutex);
    } else {
        jbd_debug(3, "superblock not updated\n");
    }

    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);

    trace_jbd_start_commit(journal, commit_transaction);
    jbd_debug(1, "JBD: starting commit of transaction %d\n",
              commit_transaction->t_tid);

    spin_lock(&journal->j_state_lock);
    commit_transaction->t_state = T_LOCKED;

    trace_jbd_commit_locking(journal, commit_transaction);
    spin_lock(&commit_transaction->t_handle_lock);
    while (commit_transaction->t_updates) {
        DEFINE_WAIT(wait);

        prepare_to_wait(&journal->j_wait_updates, &wait,
                        TASK_UNINTERRUPTIBLE);
        if (commit_transaction->t_updates) {
            spin_unlock(&commit_transaction->t_handle_lock);
            spin_unlock(&journal->j_state_lock);
            schedule();
            spin_lock(&journal->j_state_lock);
            spin_lock(&commit_transaction->t_handle_lock);
        }
        finish_wait(&journal->j_wait_updates, &wait);
    }
    spin_unlock(&commit_transaction->t_handle_lock);

    J_ASSERT (commit_transaction->t_outstanding_credits <=
              journal->j_max_transaction_buffers);

    /*
     * 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 permissible.
     */
    while (commit_transaction->t_reserved_list) {
        jh = commit_transaction->t_reserved_list;
        JBUFFER_TRACE(jh, "reserved, unused: refile");
        /*
         * A journal_get_undo_access()+journal_release_buffer() may
         * leave undo-committed data.
         */
        if (jh->b_committed_data) {
            struct buffer_head *bh = jh2bh(jh);

            jbd_lock_bh_state(bh);
            jbd_free(jh->b_committed_data, bh->b_size);
            jh->b_committed_data = NULL;
            jbd_unlock_bh_state(bh);
        }
        journal_refile_buffer(journal, 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->j_list_lock);
    __journal_clean_checkpoint_list(journal);
    spin_unlock(&journal->j_list_lock);

    jbd_debug (3, "JBD: commit phase 1\n");

    /*
     * Clear revoked flag to reflect there is no revoked buffers
     * in the next transaction which is going to be started.
     */
    journal_clear_buffer_revoked_flags(journal);

    /*
     * Switch to a new revoke table.
     */
    journal_switch_revoke_table(journal);

    trace_jbd_commit_flushing(journal, commit_transaction);
    commit_transaction->t_state = T_FLUSH;
    journal->j_committing_transaction = commit_transaction;
    journal->j_running_transaction = NULL;
    start_time = ktime_get();
    commit_transaction->t_log_start = journal->j_head;
    wake_up(&journal->j_wait_transaction_locked);
    spin_unlock(&journal->j_state_lock);

    jbd_debug (3, "JBD: commit phase 2\n");

    if (tid_geq(journal->j_commit_waited, commit_transaction->t_tid))
        write_op = WRITE_SYNC;

    /*
     * Now start flushing things to disk, in the order they appear
     * on the transaction lists.  Data blocks go first.
     */
    blk_start_plug(&plug);
    err = journal_submit_data_buffers(journal, commit_transaction,
                                      write_op);
    blk_finish_plug(&plug);

    /*
     * Wait for all previously submitted IO to complete.
     */
    spin_lock(&journal->j_list_lock);
    while (commit_transaction->t_locked_list) {
        struct buffer_head *bh;

        jh = commit_transaction->t_locked_list->b_tprev;
        bh = jh2bh(jh);
        get_bh(bh);
        if (buffer_locked(bh)) {
            spin_unlock(&journal->j_list_lock);
            wait_on_buffer(bh);
            spin_lock(&journal->j_list_lock);
        }
        if (unlikely(!buffer_uptodate(bh))) {
            if (!trylock_page(bh->b_page)) {
                spin_unlock(&journal->j_list_lock);
                lock_page(bh->b_page);
                spin_lock(&journal->j_list_lock);
            }
            if (bh->b_page->mapping)
                set_bit(AS_EIO, &bh->b_page->mapping->flags);

            unlock_page(bh->b_page);
            SetPageError(bh->b_page);
            err = -EIO;
        }
        if (!inverted_lock(journal, bh)) {
            put_bh(bh);
            spin_lock(&journal->j_list_lock);
            continue;
        }
        if (buffer_jbd(bh) && bh2jh(bh) == jh &&
                jh->b_transaction == commit_transaction &&
                jh->b_jlist == BJ_Locked)
            __journal_unfile_buffer(jh);
        jbd_unlock_bh_state(bh);
        release_data_buffer(bh);
        cond_resched_lock(&journal->j_list_lock);
    }
    spin_unlock(&journal->j_list_lock);

    if (err) {
        char b[BDEVNAME_SIZE];

        printk(KERN_WARNING
               "JBD: Detected IO errors while flushing file data "
               "on %s\n", bdevname(journal->j_fs_dev, b));
        if (journal->j_flags & JFS_ABORT_ON_SYNCDATA_ERR)
            journal_abort(journal, err);
        err = 0;
    }

    blk_start_plug(&plug);

    journal_write_revoke_records(journal, commit_transaction, write_op);

    /*
     * 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);

    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:
     */
    spin_lock(&journal->j_state_lock);
    commit_transaction->t_state = T_COMMIT;
    spin_unlock(&journal->j_state_lock);

    trace_jbd_commit_logging(journal, commit_transaction);
    J_ASSERT(commit_transaction->t_nr_buffers <=
             commit_transaction->t_outstanding_credits);

    descriptor = NULL;
    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. */

        if (is_journal_aborted(journal)) {
            clear_buffer_jbddirty(jh2bh(jh));
            JBUFFER_TRACE(jh, "journal is aborting: refile");
            journal_refile_buffer(journal, 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(journal, -EIO);
                continue;
            }

            bh = jh2bh(descriptor);
            jbd_debug(4, "JBD: got buffer %llu (%p)\n",
                      (unsigned long long)bh->b_blocknr, bh->b_data);
            header = (journal_header_t *)&bh->b_data[0];
            header->h_magic     = cpu_to_be32(JFS_MAGIC_NUMBER);
            header->h_blocktype = cpu_to_be32(JFS_DESCRIPTOR_BLOCK);
            header->h_sequence  = cpu_to_be32(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_buffer_jwrite(bh);
            set_buffer_dirty(bh);
            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(journal, err);
            continue;
        }

        /*
         * start_this_handle() uses t_outstanding_credits to determine
         * the free space in the log, but this counter is changed
         * by journal_next_log_block() also.
         */
        commit_transaction->t_outstanding_credits--;

        /* 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. */
        get_bh(jh2bh(jh));

        /* 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_buffer_jwrite(jh2bh(jh));
        /*
         * 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_buffer_jwrite(jh2bh(new_jh));
        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 = cpu_to_be32(jh2bh(jh)->b_blocknr);
        tag->t_flags = cpu_to_be32(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 == journal->j_wbufsize ||
                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 |= cpu_to_be32(JFS_FLAG_LAST_TAG);

start_journal_io:
            for (i = 0; i < bufs; i++) {
                struct buffer_head *bh = wbuf[i];
                lock_buffer(bh);
                clear_buffer_dirty(bh);
                set_buffer_uptodate(bh);
                bh->b_end_io = journal_end_buffer_io_sync;
                submit_bh(write_op, bh);
            }
            cond_resched();

            /* Force a new descriptor to be generated next
                           time round the loop. */
            descriptor = NULL;
            bufs = 0;
        }
    }

    blk_finish_plug(&plug);

    /* 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 buffers 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 j_list_lock is not needed.
     * See __journal_try_to_free_buffer.
     */
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)) {
            wait_on_buffer(bh);
            goto wait_for_iobuf;
        }
        if (cond_resched())
            goto wait_for_iobuf;

        if (unlikely(!buffer_uptodate(bh)))
            err = -EIO;

        clear_buffer_jwrite(bh);

        JBUFFER_TRACE(jh, "ph4: unfile after journal write");
        journal_unfile_buffer(journal, jh);

        /*
         * ->t_iobuf_list should contain only dummy buffer_heads
         * which were created by journal_write_metadata_buffer().
         */
        BUFFER_TRACE(bh, "dumping temporary bh");
        journal_put_journal_head(jh);
        __brelse(bh);
        J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0);
        free_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_buffer_jwrite(bh);
        J_ASSERT_BH(bh, buffer_jbddirty(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. The barrier must be here so that changes
         * by journal_file_buffer() take effect before wake_up_bit()
         * does the waitqueue check.
         */
        smp_mb();
        wake_up_bit(&bh->b_state, BH_Unshadow);
        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)) {
            wait_on_buffer(bh);
            goto wait_for_ctlbuf;
        }
        if (cond_resched())
            goto wait_for_ctlbuf;

        if (unlikely(!buffer_uptodate(bh)))
            err = -EIO;

        BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile");
        clear_buffer_jwrite(bh);
        journal_unfile_buffer(journal, jh);
        journal_put_journal_head(jh);
        __brelse(bh);		/* One for getblk */
        /* AKPM: bforget here */
    }

    if (err)
        journal_abort(journal, err);

    jbd_debug(3, "JBD: commit phase 6\n");

    /* All metadata is written, now write commit record and do cleanup */
    spin_lock(&journal->j_state_lock);
    J_ASSERT(commit_transaction->t_state == T_COMMIT);
    commit_transaction->t_state = T_COMMIT_RECORD;
    spin_unlock(&journal->j_state_lock);

    if (journal_write_commit_record(journal, commit_transaction))
        err = -EIO;

    if (err)
        journal_abort(journal, err);

    /* 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. */

    jbd_debug(3, "JBD: commit phase 7\n");

    J_ASSERT(commit_transaction->t_sync_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);

restart_loop:
    /*
     * As there are other places (journal_unmap_buffer()) adding buffers
     * to this list we have to be careful and hold the j_list_lock.
     */
    spin_lock(&journal->j_list_lock);
    while (commit_transaction->t_forget) {
        transaction_t *cp_transaction;
        struct buffer_head *bh;
        int try_to_free = 0;

        jh = commit_transaction->t_forget;
        spin_unlock(&journal->j_list_lock);
        bh = jh2bh(jh);
        /*
         * Get a reference so that bh cannot be freed before we are
         * done with it.
         */
        get_bh(bh);
        jbd_lock_bh_state(bh);
        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) {
            jbd_free(jh->b_committed_data, bh->b_size);
            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) {
            jbd_free(jh->b_frozen_data, bh->b_size);
            jh->b_frozen_data = NULL;
        }

        spin_lock(&journal->j_list_lock);
        cp_transaction = jh->b_cp_transaction;
        if (cp_transaction) {
            JBUFFER_TRACE(jh, "remove from old 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. */

        /*
         * A buffer which has been freed while still being journaled by
         * a previous transaction.
         */
        if (buffer_freed(bh)) {
            /*
             * If the running transaction is the one containing
             * "add to orphan" operation (b_next_transaction !=
             * NULL), we have to wait for that transaction to
             * commit before we can really get rid of the buffer.
             * So just clear b_modified to not confuse transaction
             * credit accounting and refile the buffer to
             * BJ_Forget of the running transaction. If the just
             * committed transaction contains "add to orphan"
             * operation, we can completely invalidate the buffer
             * now. We are rather throughout in that since the
             * buffer may be still accessible when blocksize <
             * pagesize and it is attached to the last partial
             * page.
             */
            jh->b_modified = 0;
            if (!jh->b_next_transaction) {
                clear_buffer_freed(bh);
                clear_buffer_jbddirty(bh);
                clear_buffer_mapped(bh);
                clear_buffer_new(bh);
                clear_buffer_req(bh);
                bh->b_bdev = NULL;
            }
        }

        if (buffer_jbddirty(bh)) {
            JBUFFER_TRACE(jh, "add to new checkpointing trans");
            __journal_insert_checkpoint(jh, commit_transaction);
            if (is_journal_aborted(journal))
                clear_buffer_jbddirty(bh);
        } else {
            J_ASSERT_BH(bh, !buffer_dirty(bh));
            /*
             * The buffer on BJ_Forget list and not jbddirty means
             * it has been freed by this transaction and hence it
             * could not have been reallocated until this
             * transaction has committed. *BUT* it could be
             * reallocated once we have written all the data to
             * disk and before we process the buffer on BJ_Forget
             * list.
             */
            if (!jh->b_next_transaction)
                try_to_free = 1;
        }
        JBUFFER_TRACE(jh, "refile or unfile freed buffer");
        __journal_refile_buffer(jh);
        jbd_unlock_bh_state(bh);
        if (try_to_free)
            release_buffer_page(bh);
        else
            __brelse(bh);
        cond_resched_lock(&journal->j_list_lock);
    }
    spin_unlock(&journal->j_list_lock);
    /*
     * This is a bit sleazy.  We use j_list_lock to protect transition
     * of a transaction into T_FINISHED state and calling
     * __journal_drop_transaction(). Otherwise we could race with
     * other checkpointing code processing the transaction...
     */
    spin_lock(&journal->j_state_lock);
    spin_lock(&journal->j_list_lock);
    /*
     * Now recheck if some buffers did not get attached to the transaction
     * while the lock was dropped...
     */
    if (commit_transaction->t_forget) {
        spin_unlock(&journal->j_list_lock);
        spin_unlock(&journal->j_state_lock);
        goto restart_loop;
    }

    /* Done with this transaction! */

    jbd_debug(3, "JBD: commit phase 8\n");

    J_ASSERT(commit_transaction->t_state == T_COMMIT_RECORD);

    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;
    commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));

    /*
     * weight the commit time higher than the average time so we don't
     * react too strongly to vast changes in commit time
     */
    if (likely(journal->j_average_commit_time))
        journal->j_average_commit_time = (commit_time*3 +
                                          journal->j_average_commit_time) / 4;
    else
        journal->j_average_commit_time = commit_time;

    spin_unlock(&journal->j_state_lock);

    if (commit_transaction->t_checkpoint_list == NULL &&
            commit_transaction->t_checkpoint_io_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->j_list_lock);

    trace_jbd_end_commit(journal, commit_transaction);
    jbd_debug(1, "JBD: commit %d complete, head %d\n",
              journal->j_commit_sequence, journal->j_tail_sequence);

    wake_up(&journal->j_wait_done_commit);
}
コード例 #27
0
ファイル: ialloc.c プロジェクト: hugh712/Jollen
/*
 * NOTE! When we get the inode, we're the only people
 * that have access to it, and as such there are no
 * race conditions we have to worry about. The inode
 * is not on the hash-lists, and it cannot be reached
 * through the filesystem because the directory entry
 * has been deleted earlier.
 *
 * HOWEVER: we must make sure that we get no aliases,
 * which means that we have to call "clear_inode()"
 * _before_ we mark the inode not in use in the inode
 * bitmaps. Otherwise a newly created file might use
 * the same inode number (not actually the same pointer
 * though), and then we'd have two inodes sharing the
 * same inode number and space on the harddisk.
 */
void ext3_free_inode (handle_t *handle, struct inode * inode)
{
	struct super_block * sb = inode->i_sb;
	int is_directory;
	unsigned long ino;
	struct buffer_head * bh;
	struct buffer_head * bh2;
	unsigned long block_group;
	unsigned long bit;
	int bitmap_nr;
	struct ext3_group_desc * gdp;
	struct ext3_super_block * es;
	int fatal = 0, err;

	if (!inode->i_dev) {
		printk ("ext3_free_inode: inode has no device\n");
		return;
	}
	if (atomic_read(&inode->i_count) > 1) {
		printk ("ext3_free_inode: inode has count=%d\n",
					atomic_read(&inode->i_count));
		return;
	}
	if (inode->i_nlink) {
		printk ("ext3_free_inode: inode has nlink=%d\n",
			inode->i_nlink);
		return;
	}
	if (!sb) {
		printk("ext3_free_inode: inode on nonexistent device\n");
		return;
	}

	ino = inode->i_ino;
	ext3_debug ("freeing inode %lu\n", ino);

	/*
	 * Note: we must free any quota before locking the superblock,
	 * as writing the quota to disk may need the lock as well.
	 */
	DQUOT_INIT(inode);
	DQUOT_FREE_INODE(inode);
	DQUOT_DROP(inode);

	is_directory = S_ISDIR(inode->i_mode);

	/* Do this BEFORE marking the inode not in use or returning an error */
	clear_inode (inode);

	lock_super (sb);
	es = sb->u.ext3_sb.s_es;
	if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
		ext3_error (sb, "ext3_free_inode",
			    "reserved or nonexistent inode %lu", ino);
		goto error_return;
	}
	block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
	bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
	bitmap_nr = load_inode_bitmap (sb, block_group);
	if (bitmap_nr < 0)
		goto error_return;

	bh = sb->u.ext3_sb.s_inode_bitmap[bitmap_nr];

	BUFFER_TRACE(bh, "get_write_access");
	fatal = ext3_journal_get_write_access(handle, bh);
	if (fatal)
		goto error_return;

	/* Ok, now we can actually update the inode bitmaps.. */
	if (!ext3_clear_bit (bit, bh->b_data))
		ext3_error (sb, "ext3_free_inode",
			      "bit already cleared for inode %lu", ino);
	else {
		gdp = ext3_get_group_desc (sb, block_group, &bh2);

		BUFFER_TRACE(bh2, "get_write_access");
		fatal = ext3_journal_get_write_access(handle, bh2);
		if (fatal) goto error_return;

		BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "get write access");
		fatal = ext3_journal_get_write_access(handle, sb->u.ext3_sb.s_sbh);
		if (fatal) goto error_return;

		if (gdp) {
			gdp->bg_free_inodes_count = cpu_to_le16(
				le16_to_cpu(gdp->bg_free_inodes_count) + 1);
			if (is_directory)
				gdp->bg_used_dirs_count = cpu_to_le16(
				  le16_to_cpu(gdp->bg_used_dirs_count) - 1);
		}
		BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
		err = ext3_journal_dirty_metadata(handle, bh2);
		if (!fatal) fatal = err;
		es->s_free_inodes_count =
			cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) + 1);
		BUFFER_TRACE(sb->u.ext3_sb.s_sbh,
					"call ext3_journal_dirty_metadata");
		err = ext3_journal_dirty_metadata(handle, sb->u.ext3_sb.s_sbh);
		if (!fatal) fatal = err;
	}
	BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
	err = ext3_journal_dirty_metadata(handle, bh);
	if (!fatal)
		fatal = err;
	sb->s_dirt = 1;
error_return:
	ext3_std_error(sb, fatal);
	unlock_super(sb);
}
コード例 #28
0
static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
{
	transaction_t *transaction;
	struct journal_head *jh;
	int may_free = 1;
	int ret;

	BUFFER_TRACE(bh, "entry");

	/*
	 * It is safe to proceed here without the j_list_lock because the
	 * buffers cannot be stolen by try_to_free_buffers as long as we are
	 * holding the page lock. --sct
	 */

	if (!buffer_jbd(bh))
		goto zap_buffer_unlocked;

	spin_lock(&journal->j_state_lock);
	jbd_lock_bh_state(bh);
	spin_lock(&journal->j_list_lock);

	jh = journal_grab_journal_head(bh);
	if (!jh)
		goto zap_buffer_no_jh;

	/*
	 * We cannot remove the buffer from checkpoint lists until the
	 * transaction adding inode to orphan list (let's call it T)
	 * is committed.  Otherwise if the transaction changing the
	 * buffer would be cleaned from the journal before T is
	 * committed, a crash will cause that the correct contents of
	 * the buffer will be lost.  On the other hand we have to
	 * clear the buffer dirty bit at latest at the moment when the
	 * transaction marking the buffer as freed in the filesystem
	 * structures is committed because from that moment on the
	 * buffer can be reallocated and used by a different page.
	 * Since the block hasn't been freed yet but the inode has
	 * already been added to orphan list, it is safe for us to add
	 * the buffer to BJ_Forget list of the newest transaction.
	 */
	transaction = jh->b_transaction;
	if (transaction == NULL) {
		/* First case: not on any transaction.  If it
		 * has no checkpoint link, then we can zap it:
		 * it's a writeback-mode buffer so we don't care
		 * if it hits disk safely. */
		if (!jh->b_cp_transaction) {
			JBUFFER_TRACE(jh, "not on any transaction: zap");
			goto zap_buffer;
		}

		if (!buffer_dirty(bh)) {
			/* bdflush has written it.  We can drop it now */
			goto zap_buffer;
		}

		/* OK, it must be in the journal but still not
		 * written fully to disk: it's metadata or
		 * journaled data... */

		if (journal->j_running_transaction) {
			/* ... and once the current transaction has
			 * committed, the buffer won't be needed any
			 * longer. */
			JBUFFER_TRACE(jh, "checkpointed: add to BJ_Forget");
			ret = __dispose_buffer(jh,
					journal->j_running_transaction);
			journal_put_journal_head(jh);
			spin_unlock(&journal->j_list_lock);
			jbd_unlock_bh_state(bh);
			spin_unlock(&journal->j_state_lock);
			return ret;
		} else {
			/* There is no currently-running transaction. So the
			 * orphan record which we wrote for this file must have
			 * passed into commit.  We must attach this buffer to
			 * the committing transaction, if it exists. */
			if (journal->j_committing_transaction) {
				JBUFFER_TRACE(jh, "give to committing trans");
				ret = __dispose_buffer(jh,
					journal->j_committing_transaction);
				journal_put_journal_head(jh);
				spin_unlock(&journal->j_list_lock);
				jbd_unlock_bh_state(bh);
				spin_unlock(&journal->j_state_lock);
				return ret;
			} else {
				/* The orphan record's transaction has
				 * committed.  We can cleanse this buffer */
				clear_buffer_jbddirty(bh);
				goto zap_buffer;
			}
		}
	} else if (transaction == journal->j_committing_transaction) {
		JBUFFER_TRACE(jh, "on committing transaction");
		if (jh->b_jlist == BJ_Locked) {
			/*
			 * The buffer is on the committing transaction's locked
			 * list.  We have the buffer locked, so I/O has
			 * completed.  So we can nail the buffer now.
			 */
			may_free = __dispose_buffer(jh, transaction);
			goto zap_buffer;
		}
		/*
		 * The buffer is committing, we simply cannot touch
		 * it. So we just set j_next_transaction to the
		 * running transaction (if there is one) and mark
		 * buffer as freed so that commit code knows it should
		 * clear dirty bits when it is done with the buffer.
		 */
		set_buffer_freed(bh);
		if (journal->j_running_transaction && buffer_jbddirty(bh))
			jh->b_next_transaction = journal->j_running_transaction;
		journal_put_journal_head(jh);
		spin_unlock(&journal->j_list_lock);
		jbd_unlock_bh_state(bh);
		spin_unlock(&journal->j_state_lock);
		return 0;
	} else {
		/* Good, the buffer belongs to the running transaction.
		 * We are writing our own transaction's data, not any
		 * previous one's, so it is safe to throw it away
		 * (remember that we expect the filesystem to have set
		 * i_size already for this truncate so recovery will not
		 * expose the disk blocks we are discarding here.) */
		J_ASSERT_JH(jh, transaction == journal->j_running_transaction);
		JBUFFER_TRACE(jh, "on running transaction");
		may_free = __dispose_buffer(jh, transaction);
	}

zap_buffer:
	journal_put_journal_head(jh);
zap_buffer_no_jh:
	spin_unlock(&journal->j_list_lock);
	jbd_unlock_bh_state(bh);
	spin_unlock(&journal->j_state_lock);
zap_buffer_unlocked:
	clear_buffer_dirty(bh);
	J_ASSERT_BH(bh, !buffer_jbddirty(bh));
	clear_buffer_mapped(bh);
	clear_buffer_req(bh);
	clear_buffer_new(bh);
	bh->b_bdev = NULL;
	return may_free;
}
コード例 #29
0
static int do_one_pass(journal_t *journal,
			struct recovery_info *info, enum passtype pass)
{
	unsigned int		first_commit_ID, next_commit_ID;
	unsigned long		next_log_block;
	int			err, success = 0;
	journal_superblock_t *	sb;
	journal_header_t *	tmp;
	struct buffer_head *	bh;
	unsigned int		sequence;
	int			blocktype;
	int			tag_bytes = journal_tag_bytes(journal);
	__u32			crc32_sum = ~0; 


	sb = journal->j_superblock;
	next_commit_ID = be32_to_cpu(sb->s_sequence);
	next_log_block = be32_to_cpu(sb->s_start);

	first_commit_ID = next_commit_ID;
	if (pass == PASS_SCAN)
		info->start_transaction = first_commit_ID;

	jbd_debug(1, "Starting recovery pass %d\n", pass);


	while (1) {
		int			flags;
		char *			tagp;
		journal_block_tag_t *	tag;
		struct buffer_head *	obh;
		struct buffer_head *	nbh;

		cond_resched();


		if (pass != PASS_SCAN)
			if (tid_geq(next_commit_ID, info->end_transaction))
				break;

		jbd_debug(2, "Scanning for sequence ID %u at %lu/%lu\n",
			  next_commit_ID, next_log_block, journal->j_last);


		jbd_debug(3, "JBD2: checking block %ld\n", next_log_block);
		err = jread(&bh, journal, next_log_block);
		if (err)
			goto failed;

		next_log_block++;
		wrap(journal, next_log_block);


		tmp = (journal_header_t *)bh->b_data;

		if (tmp->h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER)) {
			brelse(bh);
			break;
		}

		blocktype = be32_to_cpu(tmp->h_blocktype);
		sequence = be32_to_cpu(tmp->h_sequence);
		jbd_debug(3, "Found magic %d, sequence %d\n",
			  blocktype, sequence);

		if (sequence != next_commit_ID) {
			brelse(bh);
			break;
		}


		switch(blocktype) {
		case JBD2_DESCRIPTOR_BLOCK:
			if (pass != PASS_REPLAY) {
				if (pass == PASS_SCAN &&
				    JBD2_HAS_COMPAT_FEATURE(journal,
					    JBD2_FEATURE_COMPAT_CHECKSUM) &&
				    !info->end_transaction) {
					if (calc_chksums(journal, bh,
							&next_log_block,
							&crc32_sum)) {
						put_bh(bh);
						break;
					}
					put_bh(bh);
					continue;
				}
				next_log_block += count_tags(journal, bh);
				wrap(journal, next_log_block);
				put_bh(bh);
				continue;
			}


			tagp = &bh->b_data[sizeof(journal_header_t)];
			while ((tagp - bh->b_data + tag_bytes)
			       <= journal->j_blocksize) {
				unsigned long io_block;

				tag = (journal_block_tag_t *) tagp;
				flags = be32_to_cpu(tag->t_flags);

				io_block = next_log_block++;
				wrap(journal, next_log_block);
				err = jread(&obh, journal, io_block);
				if (err) {
					success = err;
					printk(KERN_ERR
						"JBD2: IO error %d recovering "
						"block %ld in log\n",
						err, io_block);
				} else {
					unsigned long long blocknr;

					J_ASSERT(obh != NULL);
					blocknr = read_tag_block(tag_bytes,
								 tag);

					if (jbd2_journal_test_revoke
					    (journal, blocknr,
					     next_commit_ID)) {
						brelse(obh);
						++info->nr_revoke_hits;
						goto skip_write;
					}

					nbh = __getblk(journal->j_fs_dev,
							blocknr,
							journal->j_blocksize);
					if (nbh == NULL) {
						printk(KERN_ERR
						       "JBD2: Out of memory "
						       "during recovery.\n");
						err = -ENOMEM;
						brelse(bh);
						brelse(obh);
						goto failed;
					}

					lock_buffer(nbh);
					memcpy(nbh->b_data, obh->b_data,
							journal->j_blocksize);
					if (flags & JBD2_FLAG_ESCAPE) {
						*((__be32 *)nbh->b_data) =
						cpu_to_be32(JBD2_MAGIC_NUMBER);
					}

					BUFFER_TRACE(nbh, "marking dirty");
					set_buffer_uptodate(nbh);
					mark_buffer_dirty(nbh);
					BUFFER_TRACE(nbh, "marking uptodate");
					++info->nr_replays;
					
					unlock_buffer(nbh);
					brelse(obh);
					brelse(nbh);
				}

			skip_write:
				tagp += tag_bytes;
				if (!(flags & JBD2_FLAG_SAME_UUID))
					tagp += 16;

				if (flags & JBD2_FLAG_LAST_TAG)
					break;
			}

			brelse(bh);
			continue;

		case JBD2_COMMIT_BLOCK:

			if (pass == PASS_SCAN &&
			    JBD2_HAS_COMPAT_FEATURE(journal,
				    JBD2_FEATURE_COMPAT_CHECKSUM)) {
				int chksum_err, chksum_seen;
				struct commit_header *cbh =
					(struct commit_header *)bh->b_data;
				unsigned found_chksum =
					be32_to_cpu(cbh->h_chksum[0]);

				chksum_err = chksum_seen = 0;

				if (info->end_transaction) {
					journal->j_failed_commit =
						info->end_transaction;
					brelse(bh);
					break;
				}

				if (crc32_sum == found_chksum &&
				    cbh->h_chksum_type == JBD2_CRC32_CHKSUM &&
				    cbh->h_chksum_size ==
						JBD2_CRC32_CHKSUM_SIZE)
				       chksum_seen = 1;
				else if (!(cbh->h_chksum_type == 0 &&
					     cbh->h_chksum_size == 0 &&
					     found_chksum == 0 &&
					     !chksum_seen))
						chksum_err = 1;

				if (chksum_err) {
					info->end_transaction = next_commit_ID;

					if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
					   JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)){
						journal->j_failed_commit =
							next_commit_ID;
						brelse(bh);
						break;
					}
				}
				crc32_sum = ~0;
			}
			brelse(bh);
			next_commit_ID++;
			continue;

		case JBD2_REVOKE_BLOCK:
			if (pass != PASS_REVOKE) {
				brelse(bh);
				continue;
			}

			err = scan_revoke_records(journal, bh,
						  next_commit_ID, info);
			brelse(bh);
			if (err)
				goto failed;
			continue;

		default:
			jbd_debug(3, "Unrecognised magic %d, end of scan.\n",
				  blocktype);
			brelse(bh);
			goto done;
		}
	}

 done:

	if (pass == PASS_SCAN) {
		if (!info->end_transaction)
			info->end_transaction = next_commit_ID;
	} else {
		if (info->end_transaction != next_commit_ID) {
			printk(KERN_ERR "JBD2: recovery pass %d ended at "
				"transaction %u, expected %u\n",
				pass, next_commit_ID, info->end_transaction);
			if (!success)
				success = -EIO;
		}
	}

	return success;

 failed:
	return err;
}