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authorJeff Mahoney <jeffm@suse.com>2010-03-23 13:35:39 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-13 13:20:19 -0700
commitee0f79ddf59966d514dae5b6c9fcfca0aec46492 (patch)
treef805244b8ac8eff0bd3cb1cc048220d3d10b506b
parent670a13a74e34d9fff0cd03df73d8a2b77f7decb7 (diff)
reiserfs: properly honor read-only devices
commit 3f8b5ee33293d43ca360771b535dfae8c57259dc upstream. The reiserfs journal behaves inconsistently when determining whether to allow a mount of a read-only device. This is due to the use of the continue_replay variable to short circuit the journal scanning. If it's set, it's assumed that there are transactions to replay, but there may not be. If it's unset, it's assumed that there aren't any, and that may not be the case either. I've observed two failure cases: 1) Where a clean file system on a read-only device refuses to mount 2) Where a clean file system on a read-only device passes the optimization and then tries writing the journal header to update the latest mount id. The former is easily observable by using a freshly created file system on a read-only loopback device. This patch moves the check into journal_read_transaction, where it can bail out before it's about to replay a transaction. That way it can go through and skip transactions where appropriate, yet still refuse to mount a file system with outstanding transactions. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/reiserfs/journal.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 90622200b39c..b5fe0aa033e7 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -2184,6 +2184,15 @@ static int journal_read_transaction(struct super_block *sb,
brelse(d_bh);
return 1;
}
+
+ if (bdev_read_only(sb->s_bdev)) {
+ reiserfs_warning(sb, "clm-2076",
+ "device is readonly, unable to replay log");
+ brelse(c_bh);
+ brelse(d_bh);
+ return -EROFS;
+ }
+
trans_id = get_desc_trans_id(desc);
/* now we know we've got a good transaction, and it was inside the valid time ranges */
log_blocks = kmalloc(get_desc_trans_len(desc) *
@@ -2422,12 +2431,6 @@ static int journal_read(struct super_block *sb)
goto start_log_replay;
}
- if (continue_replay && bdev_read_only(sb->s_bdev)) {
- reiserfs_warning(sb, "clm-2076",
- "device is readonly, unable to replay log");
- return -1;
- }
-
/* ok, there are transactions that need to be replayed. start with the first log block, find
** all the valid transactions, and pick out the oldest.
*/