Messages in this thread Patch in this message | | | Date | Wed, 11 Aug 2010 16:55:19 -0700 | From | Greg KH <> | Subject | [098/111] reiserfs: properly honor read-only devices |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: Jeff Mahoney <jeffm@suse.com>
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>
--- fs/reiserfs/journal.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
--- a/fs/reiserfs/journal.c +++ b/fs/reiserfs/journal.c @@ -2184,6 +2184,15 @@ static int journal_read_transaction(stru 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_blo 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. */
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