jbd2: move more common code into journal_init_common()
There are some repetitive code in jbd2_journal_init_dev() and jbd2_journal_init_inode(). So this patch moves the common code into journal_init_common() helper to simplify the code. And fix the coding style warnings reported by checkpatch.pl by the way. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Geliang Tang
Theodore Ts'o
Родитель
be32197cd6
Коммит
f0c9fd5458
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@ -1090,11 +1090,15 @@ static void jbd2_stats_proc_exit(journal_t *journal)
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* very few fields yet: that has to wait until we have created the
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* journal structures from from scratch, or loaded them from disk. */
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static journal_t * journal_init_common (void)
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static journal_t *journal_init_common(struct block_device *bdev,
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struct block_device *fs_dev,
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unsigned long long start, int len, int blocksize)
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{
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static struct lock_class_key jbd2_trans_commit_key;
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journal_t *journal;
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int err;
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struct buffer_head *bh;
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int n;
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journal = kzalloc(sizeof(*journal), GFP_KERNEL);
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if (!journal)
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@ -1131,6 +1135,32 @@ static journal_t * journal_init_common (void)
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lockdep_init_map(&journal->j_trans_commit_map, "jbd2_handle",
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&jbd2_trans_commit_key, 0);
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/* journal descriptor can store up to n blocks -bzzz */
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journal->j_blocksize = blocksize;
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journal->j_dev = bdev;
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journal->j_fs_dev = fs_dev;
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journal->j_blk_offset = start;
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journal->j_maxlen = len;
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n = journal->j_blocksize / sizeof(journal_block_tag_t);
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journal->j_wbufsize = n;
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journal->j_wbuf = kmalloc_array(n, sizeof(struct buffer_head *),
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GFP_KERNEL);
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if (!journal->j_wbuf) {
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kfree(journal);
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return NULL;
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}
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bh = getblk_unmovable(journal->j_dev, start, journal->j_blocksize);
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if (!bh) {
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pr_err("%s: Cannot get buffer for journal superblock\n",
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__func__);
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kfree(journal->j_wbuf);
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kfree(journal);
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return NULL;
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}
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journal->j_sb_buffer = bh;
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journal->j_superblock = (journal_superblock_t *)bh->b_data;
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return journal;
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}
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@ -1157,51 +1187,21 @@ static journal_t * journal_init_common (void)
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* range of blocks on an arbitrary block device.
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*
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*/
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journal_t * jbd2_journal_init_dev(struct block_device *bdev,
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journal_t *jbd2_journal_init_dev(struct block_device *bdev,
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struct block_device *fs_dev,
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unsigned long long start, int len, int blocksize)
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{
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journal_t *journal = journal_init_common();
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struct buffer_head *bh;
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int n;
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journal_t *journal;
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journal = journal_init_common(bdev, fs_dev, start, len, blocksize);
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if (!journal)
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return NULL;
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/* journal descriptor can store up to n blocks -bzzz */
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journal->j_blocksize = blocksize;
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journal->j_dev = bdev;
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journal->j_fs_dev = fs_dev;
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journal->j_blk_offset = start;
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journal->j_maxlen = len;
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bdevname(journal->j_dev, journal->j_devname);
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strreplace(journal->j_devname, '/', '!');
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jbd2_stats_proc_init(journal);
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n = journal->j_blocksize / sizeof(journal_block_tag_t);
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journal->j_wbufsize = n;
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journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
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if (!journal->j_wbuf) {
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printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n",
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__func__);
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goto out_err;
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}
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bh = __getblk(journal->j_dev, start, journal->j_blocksize);
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if (!bh) {
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printk(KERN_ERR
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"%s: Cannot get buffer for journal superblock\n",
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__func__);
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goto out_err;
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}
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journal->j_sb_buffer = bh;
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journal->j_superblock = (journal_superblock_t *)bh->b_data;
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return journal;
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out_err:
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kfree(journal->j_wbuf);
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jbd2_stats_proc_exit(journal);
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kfree(journal);
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return NULL;
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}
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/**
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@ -1212,67 +1212,36 @@ out_err:
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* the journal. The inode must exist already, must support bmap() and
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* must have all data blocks preallocated.
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*/
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journal_t * jbd2_journal_init_inode (struct inode *inode)
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journal_t *jbd2_journal_init_inode(struct inode *inode)
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{
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struct buffer_head *bh;
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journal_t *journal = journal_init_common();
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journal_t *journal;
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char *p;
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int err;
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int n;
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unsigned long long blocknr;
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blocknr = bmap(inode, 0);
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if (!blocknr) {
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pr_err("%s: Cannot locate journal superblock\n",
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__func__);
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return NULL;
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}
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jbd_debug(1, "JBD2: inode %s/%ld, size %lld, bits %d, blksize %ld\n",
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inode->i_sb->s_id, inode->i_ino, (long long) inode->i_size,
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inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize);
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journal = journal_init_common(inode->i_sb->s_bdev, inode->i_sb->s_bdev,
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blocknr, inode->i_size >> inode->i_sb->s_blocksize_bits,
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inode->i_sb->s_blocksize);
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if (!journal)
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return NULL;
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journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev;
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journal->j_inode = inode;
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bdevname(journal->j_dev, journal->j_devname);
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p = strreplace(journal->j_devname, '/', '!');
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sprintf(p, "-%lu", journal->j_inode->i_ino);
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jbd_debug(1,
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"journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n",
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journal, inode->i_sb->s_id, inode->i_ino,
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(long long) inode->i_size,
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inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize);
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journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits;
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journal->j_blocksize = inode->i_sb->s_blocksize;
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jbd2_stats_proc_init(journal);
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/* journal descriptor can store up to n blocks -bzzz */
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n = journal->j_blocksize / sizeof(journal_block_tag_t);
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journal->j_wbufsize = n;
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journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
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if (!journal->j_wbuf) {
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printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n",
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__func__);
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goto out_err;
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}
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err = jbd2_journal_bmap(journal, 0, &blocknr);
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/* If that failed, give up */
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if (err) {
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printk(KERN_ERR "%s: Cannot locate journal superblock\n",
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__func__);
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goto out_err;
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}
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bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
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if (!bh) {
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printk(KERN_ERR
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"%s: Cannot get buffer for journal superblock\n",
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__func__);
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goto out_err;
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}
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journal->j_sb_buffer = bh;
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journal->j_superblock = (journal_superblock_t *)bh->b_data;
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return journal;
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out_err:
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kfree(journal->j_wbuf);
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jbd2_stats_proc_exit(journal);
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kfree(journal);
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return NULL;
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}
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/*
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