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Date: Wed, 7 Sep 2016 20:41:13 +0800
From: Geliang Tang <geliangtang@...il.com>
To: "Theodore Ts'o" <tytso@....edu>, Jan Kara <jack@...e.com>,
Eric Ren <zren@...e.com>
Cc: Geliang Tang <geliangtang@...il.com>, linux-ext4@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...il.com>
---
fs/jbd2/journal.c | 136 +++++++++++++++++++++---------------------------------
1 file changed, 53 insertions(+), 83 deletions(-)
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 46261a6..07e14ef 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1090,11 +1090,15 @@ static void jbd2_stats_proc_exit(journal_t *journal)
* very few fields yet: that has to wait until we have created the
* journal structures from from scratch, or loaded them from disk. */
-static journal_t * journal_init_common (void)
+static journal_t *journal_init_common(struct block_device *bdev,
+ struct block_device *fs_dev,
+ unsigned long long start, int len, int blocksize)
{
static struct lock_class_key jbd2_trans_commit_key;
journal_t *journal;
int err;
+ struct buffer_head *bh;
+ int n;
journal = kzalloc(sizeof(*journal), GFP_KERNEL);
if (!journal)
@@ -1131,6 +1135,35 @@ static journal_t * journal_init_common (void)
lockdep_init_map(&journal->j_trans_commit_map, "jbd2_handle",
&jbd2_trans_commit_key, 0);
+ /* journal descriptor can store up to n blocks -bzzz */
+ journal->j_blocksize = blocksize;
+ journal->j_dev = bdev;
+ journal->j_fs_dev = fs_dev;
+ journal->j_blk_offset = start;
+ journal->j_maxlen = len;
+ jbd2_stats_proc_init(journal);
+ n = journal->j_blocksize / sizeof(journal_block_tag_t);
+ journal->j_wbufsize = n;
+ journal->j_wbuf = kmalloc_array(n, sizeof(struct buffer_head *),
+ GFP_KERNEL);
+ if (!journal->j_wbuf) {
+ jbd2_stats_proc_exit(journal);
+ kfree(journal);
+ return NULL;
+ }
+
+ bh = getblk_unmovable(journal->j_dev, start, journal->j_blocksize);
+ if (!bh) {
+ pr_err("%s: Cannot get buffer for journal superblock\n",
+ __func__);
+ kfree(journal->j_wbuf);
+ jbd2_stats_proc_exit(journal);
+ kfree(journal);
+ return NULL;
+ }
+ journal->j_sb_buffer = bh;
+ journal->j_superblock = (journal_superblock_t *)bh->b_data;
+
return journal;
}
@@ -1157,51 +1190,20 @@ static journal_t * journal_init_common (void)
* range of blocks on an arbitrary block device.
*
*/
-journal_t * jbd2_journal_init_dev(struct block_device *bdev,
+journal_t *jbd2_journal_init_dev(struct block_device *bdev,
struct block_device *fs_dev,
unsigned long long start, int len, int blocksize)
{
- journal_t *journal = journal_init_common();
- struct buffer_head *bh;
- int n;
+ journal_t *journal;
+ journal = journal_init_common(bdev, fs_dev, start, len, blocksize);
if (!journal)
return NULL;
- /* journal descriptor can store up to n blocks -bzzz */
- journal->j_blocksize = blocksize;
- journal->j_dev = bdev;
- journal->j_fs_dev = fs_dev;
- journal->j_blk_offset = start;
- journal->j_maxlen = len;
bdevname(journal->j_dev, journal->j_devname);
strreplace(journal->j_devname, '/', '!');
- jbd2_stats_proc_init(journal);
- n = journal->j_blocksize / sizeof(journal_block_tag_t);
- journal->j_wbufsize = n;
- journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
- if (!journal->j_wbuf) {
- printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n",
- __func__);
- goto out_err;
- }
-
- bh = __getblk(journal->j_dev, start, journal->j_blocksize);
- if (!bh) {
- printk(KERN_ERR
- "%s: Cannot get buffer for journal superblock\n",
- __func__);
- goto out_err;
- }
- journal->j_sb_buffer = bh;
- journal->j_superblock = (journal_superblock_t *)bh->b_data;
return journal;
-out_err:
- kfree(journal->j_wbuf);
- jbd2_stats_proc_exit(journal);
- kfree(journal);
- return NULL;
}
/**
@@ -1212,67 +1214,35 @@ out_err:
* the journal. The inode must exist already, must support bmap() and
* must have all data blocks preallocated.
*/
-journal_t * jbd2_journal_init_inode (struct inode *inode)
+journal_t *jbd2_journal_init_inode(struct inode *inode)
{
- struct buffer_head *bh;
- journal_t *journal = journal_init_common();
+ journal_t *journal;
char *p;
- int err;
- int n;
unsigned long long blocknr;
+ blocknr = bmap(inode, 0);
+ if (!blocknr) {
+ pr_err("%s: Cannot locate journal superblock\n",
+ __func__);
+ return NULL;
+ }
+
+ jbd_debug(1, "JBD2: inode %s/%ld, size %lld, bits %d, blksize %ld\n",
+ inode->i_sb->s_id, inode->i_ino, (long long) inode->i_size,
+ inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize);
+
+ journal = journal_init_common(inode->i_sb->s_bdev, inode->i_sb->s_bdev,
+ blocknr, inode->i_size >> inode->i_sb->s_blocksize_bits,
+ inode->i_sb->s_blocksize);
if (!journal)
return NULL;
- journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev;
journal->j_inode = inode;
bdevname(journal->j_dev, journal->j_devname);
p = strreplace(journal->j_devname, '/', '!');
sprintf(p, "-%lu", journal->j_inode->i_ino);
- jbd_debug(1,
- "journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n",
- journal, inode->i_sb->s_id, inode->i_ino,
- (long long) inode->i_size,
- inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize);
-
- journal->j_maxlen = inode->i_size >> inode->i_sb->s_blocksize_bits;
- journal->j_blocksize = inode->i_sb->s_blocksize;
- jbd2_stats_proc_init(journal);
-
- /* journal descriptor can store up to n blocks -bzzz */
- n = journal->j_blocksize / sizeof(journal_block_tag_t);
- journal->j_wbufsize = n;
- journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
- if (!journal->j_wbuf) {
- printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n",
- __func__);
- goto out_err;
- }
-
- err = jbd2_journal_bmap(journal, 0, &blocknr);
- /* If that failed, give up */
- if (err) {
- printk(KERN_ERR "%s: Cannot locate journal superblock\n",
- __func__);
- goto out_err;
- }
-
- bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
- if (!bh) {
- printk(KERN_ERR
- "%s: Cannot get buffer for journal superblock\n",
- __func__);
- goto out_err;
- }
- journal->j_sb_buffer = bh;
- journal->j_superblock = (journal_superblock_t *)bh->b_data;
return journal;
-out_err:
- kfree(journal->j_wbuf);
- jbd2_stats_proc_exit(journal);
- kfree(journal);
- return NULL;
}
/*
--
2.7.4
--
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