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Date: Sun, 16 Nov 2008 11:05:23 -0500
From: Theodore Ts'o <tytso@....edu>
To: stable@...nel.org
Cc: Ext4 Developers List <linux-ext4@...r.kernel.org>,
Theodore Ts'o <tytso@....edu>
Subject: [FOR-STABLE 03/20] jbd2: fix /proc setup for devices that contain '/' in their names
Some devices such as "cciss/c0d0p9" will cause jbd2 setup and teardown
failures when /proc filenames are created with embedded slashes. This
is a slimmed down version of commit 05496769, with the stack reduction
aspects of the patch omitted to meet the -stable criteria.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
fs/jbd2/journal.c | 22 ++++++++++++++--------
include/linux/jbd2.h | 3 ++-
2 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 8207a01..ebe4940 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -901,10 +901,7 @@ 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 +912,9 @@ 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 +1012,7 @@ 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 +1034,10 @@ 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 +1060,7 @@ 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 +1070,12 @@ 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,
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 3dd2090..66c3499 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -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
--
1.6.0.4.8.g36f27.dirty
--
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