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jbd2: clean up how the journal device name is printed 

Calculate the journal device name once and stash it away in the
journal_s structure.  This avoids needing to call bdevname()
everywhere and reduces stack usage by not needing to allocate an
on-stack buffer.  In addition, we eliminate the '/' that can appear in
device names (e.g. "cciss/c0d0p9" --- see kernel bugzilla #11321) that
can cause problems when creating proc directory names, and include the
inode number to support ocfs2 which creates multiple journals with
different inode numbers.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2008-09-16 14:36:17 -04:00
parent 899fc1a4cf
commit 05496769e5
4 changed files with 24 additions and 50 deletions
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12
fs/ext4/super.c
View File

@ -1476,15 +1476,9 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
EXT4_INODES_PER_GROUP(sb),
sbi->s_mount_opt);
if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
char b[BDEVNAME_SIZE];
printk(KERN_INFO "EXT4 FS on %s, external journal on %s\n",
sb->s_id, bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
} else {
printk(KERN_INFO "EXT4 FS on %s, internal journal\n",
sb->s_id);
}
printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
"external", EXT4_SB(sb)->s_journal->j_devname);
return res;
}

11
fs/jbd2/commit.c
View File

@ -147,12 +147,9 @@ static int journal_submit_commit_record(journal_t *journal,
* to remember if we sent a barrier request
*/
if (ret == -EOPNOTSUPP && barrier_done) {
char b[BDEVNAME_SIZE];
printk(KERN_WARNING
"JBD: barrier-based sync failed on %s - "
"disabling barriers\n",
bdevname(journal->j_dev, b));
"JBD: barrier-based sync failed on %s - "
"disabling barriers\n", journal->j_devname);
spin_lock(&journal->j_state_lock);
journal->j_flags &= ~JBD2_BARRIER;
spin_unlock(&journal->j_state_lock);
@ -681,11 +678,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
*/
err = journal_finish_inode_data_buffers(journal, commit_transaction);
if (err) {
char b[BDEVNAME_SIZE];
printk(KERN_WARNING
"JBD2: Detected IO errors while flushing file data "
"on %s\n", bdevname(journal->j_fs_dev, b));
"on %s\n", journal->j_devname);
err = 0;
}

48
fs/jbd2/journal.c
View File

@ -597,13 +597,9 @@ int jbd2_journal_bmap(journal_t *journal, unsigned long blocknr,
if (ret)
*retp = ret;
else {
char b[BDEVNAME_SIZE];
printk(KERN_ALERT "%s: journal block not found "
"at offset %lu on %s\n",
__func__,
blocknr,
bdevname(journal->j_dev, b));
__func__, blocknr, journal->j_devname);
err = -EIO;
__journal_abort_soft(journal, err);
}
@ -901,10 +897,7 @@ static struct proc_dir_entry *proc_jbd2_stats;
static void jbd2_stats_proc_init(journal_t *journal)
{
char name[BDEVNAME_SIZE];
bdevname(journal->j_dev, name);
journal->j_proc_entry = proc_mkdir(name, proc_jbd2_stats);
journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats);
if (journal->j_proc_entry) {
proc_create_data("history", S_IRUGO, journal->j_proc_entry,
&jbd2_seq_history_fops, journal);
@ -915,12 +908,9 @@ static void jbd2_stats_proc_init(journal_t *journal)
static void jbd2_stats_proc_exit(journal_t *journal)
{
char name[BDEVNAME_SIZE];
bdevname(journal->j_dev, name);
remove_proc_entry("info", journal->j_proc_entry);
remove_proc_entry("history", journal->j_proc_entry);
remove_proc_entry(name, proc_jbd2_stats);
remove_proc_entry(journal->j_devname, proc_jbd2_stats);
}
static void journal_init_stats(journal_t *journal)
@ -1018,6 +1008,7 @@ journal_t * jbd2_journal_init_dev(struct block_device *bdev,
{
journal_t *journal = journal_init_common();
struct buffer_head *bh;
char *p;
int n;
if (!journal)
@ -1039,6 +1030,10 @@ journal_t * jbd2_journal_init_dev(struct block_device *bdev,
journal->j_fs_dev = fs_dev;
journal->j_blk_offset = start;
journal->j_maxlen = len;
bdevname(journal->j_dev, journal->j_devname);
p = journal->j_devname;
while ((p = strchr(p, '/')))
*p = '!';
jbd2_stats_proc_init(journal);
bh = __getblk(journal->j_dev, start, journal->j_blocksize);
@ -1061,6 +1056,7 @@ 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;
@ -1070,6 +1066,12 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev;
journal->j_inode = inode;
bdevname(journal->j_dev, journal->j_devname);
p = journal->j_devname;
while ((p = strchr(p, '/')))
*p = '!';
p = journal->j_devname + strlen(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,
@ -1760,23 +1762,6 @@ int jbd2_journal_wipe(journal_t *journal, int write)
return err;
}
/*
* journal_dev_name: format a character string to describe on what
* device this journal is present.
*/
static const char *journal_dev_name(journal_t *journal, char *buffer)
{
struct block_device *bdev;
if (journal->j_inode)
bdev = journal->j_inode->i_sb->s_bdev;
else
bdev = journal->j_dev;
return bdevname(bdev, buffer);
}
/*
* Journal abort has very specific semantics, which we describe
* for journal abort.
@ -1793,13 +1778,12 @@ static const char *journal_dev_name(journal_t *journal, char *buffer)
void __jbd2_journal_abort_hard(journal_t *journal)
{
transaction_t *transaction;
char b[BDEVNAME_SIZE];
if (journal->j_flags & JBD2_ABORT)
return;
printk(KERN_ERR "Aborting journal on device %s.\n",
journal_dev_name(journal, b));
journal->j_devname);
spin_lock(&journal->j_state_lock);
journal->j_flags |= JBD2_ABORT;

3
include/linux/jbd2.h
View File

@ -850,7 +850,8 @@ struct journal_s
*/
struct block_device *j_dev;
int j_blocksize;
unsigned long long j_blk_offset;
unsigned long long j_blk_offset;
char j_devname[BDEVNAME_SIZE+24];
/*
* Device which holds the client fs. For internal journal this will be