| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <4f138dd04ef1dd370642c24f4a801370cc12ca54.1472644753.git.geliangtang@gmail.com>
Date: Wed, 31 Aug 2016 20:23:03 +0800
From: Geliang Tang <geliangtang@...il.com>
To: "Theodore Ts'o" <tytso@....edu>, Jan Kara <jack@...e.com>
Cc: Geliang Tang <geliangtang@...il.com>, linux-ext4@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] jbd2: add jbd2_journal_init() helper
There are some repetitive code in jbd2_journal_init_dev() and
jbd2_journal_init_inode(). So this patch extracts the common code into
jbd2_journal_init() 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 | 130 +++++++++++++++++++++++++++---------------------------
1 file changed, 66 insertions(+), 64 deletions(-)
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 46261a6..c10f657 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1143,30 +1143,13 @@ static journal_t * journal_init_common (void)
*
*/
-/**
- * journal_t * jbd2_journal_init_dev() - creates and initialises a journal structure
- * @bdev: Block device on which to create the journal
- * @fs_dev: Device which hold journalled filesystem for this journal.
- * @start: Block nr Start of journal.
- * @len: Length of the journal in blocks.
- * @blocksize: blocksize of journalling device
- *
- * Returns: a newly created journal_t *
- *
- * jbd2_journal_init_dev creates a journal which maps a fixed contiguous
- * range of blocks on an arbitrary block device.
- *
- */
-journal_t * jbd2_journal_init_dev(struct block_device *bdev,
- struct block_device *fs_dev,
- unsigned long long start, int len, int blocksize)
+static int jbd2_journal_init(journal_t *journal, struct block_device *bdev,
+ struct block_device *fs_dev, unsigned long long start,
+ int len, int blocksize, gfp_t gfp)
{
- journal_t *journal = journal_init_common();
struct buffer_head *bh;
int n;
-
- if (!journal)
- return NULL;
+ int err = 0;
/* journal descriptor can store up to n blocks -bzzz */
journal->j_blocksize = blocksize;
@@ -1183,94 +1166,113 @@ journal_t * jbd2_journal_init_dev(struct block_device *bdev,
if (!journal->j_wbuf) {
printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n",
__func__);
+ err = -ENOMEM;
goto out_err;
}
- bh = __getblk(journal->j_dev, start, journal->j_blocksize);
+ bh = __getblk_gfp(journal->j_dev, start, journal->j_blocksize, gfp);
if (!bh) {
printk(KERN_ERR
"%s: Cannot get buffer for journal superblock\n",
__func__);
+ err = -EIO;
goto out_err;
}
journal->j_sb_buffer = bh;
journal->j_superblock = (journal_superblock_t *)bh->b_data;
- return journal;
+ return 0;
out_err:
kfree(journal->j_wbuf);
jbd2_stats_proc_exit(journal);
+ return err;
+}
+
+/**
+ * journal_t *jbd2_journal_init_dev() - creates and initialises a journal
+ * structure.
+ * @bdev: Block device on which to create the journal
+ * @fs_dev: Device which hold journalled filesystem for this journal.
+ * @start: Block nr Start of journal.
+ * @len: Length of the journal in blocks.
+ * @blocksize: blocksize of journalling device
+ *
+ * Returns: a newly created journal_t *
+ *
+ * jbd2_journal_init_dev creates a journal which maps a fixed contiguous
+ * range of blocks on an arbitrary block device.
+ */
+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();
+ int err;
+
+ if (!journal)
+ return NULL;
+
+ err = jbd2_journal_init(journal, bdev, fs_dev, start, len,
+ blocksize, __GFP_MOVABLE);
+ if (err) {
+ pr_err("%s: journal init error\n",
+ __func__);
+ goto out_err;
+ }
+
+ return journal;
+
+out_err:
kfree(journal);
return NULL;
}
/**
- * journal_t * jbd2_journal_init_inode () - creates a journal which maps to a inode.
- * @inode: An inode to create the journal in
+ * journal_t *jbd2_journal_init_inode() - creates a journal which maps to a
+ * inode.
+ * @inode: An inode to create the journal in
+ *
+ * Returns: a newly created journal_t *
*
* jbd2_journal_init_inode creates a journal which maps an on-disk inode as
- * the journal. The inode must exist already, must support bmap() and
- * must have all data blocks preallocated.
+ * 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();
- char *p;
- int err;
- int n;
unsigned long long blocknr;
+ int err;
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",
+ pr_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",
+ err = jbd2_journal_init(journal, 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, 0);
+ if (err) {
+ pr_err("%s: journal init error\n",
__func__);
goto out_err;
}
- journal->j_sb_buffer = bh;
- journal->j_superblock = (journal_superblock_t *)bh->b_data;
+
+ sprintf(journal->j_devname, "%s-%lu",
+ journal->j_devname, journal->j_inode->i_ino);
return journal;
+
out_err:
- kfree(journal->j_wbuf);
- jbd2_stats_proc_exit(journal);
kfree(journal);
return NULL;
}
--
2.7.4
Powered by blists - more mailing lists