From a4c9b34d6a17081005ec459b57b8effc08f4c731 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Tue, 8 Aug 2017 18:21:53 -0700 Subject: [PATCH] xfs: handle -EFSCORRUPTED during head/tail verification Torn write and tail overwrite detection both trigger only on -EFSBADCRC errors. While this is the most likely failure scenario for each condition, -EFSCORRUPTED is still possible in certain cases depending on what ends up on disk when a torn write or partial tail overwrite occurs. For example, an invalid log record h_len can lead to an -EFSCORRUPTED error when running the log recovery CRC pass. Therefore, update log head and tail verification to trigger the associated head/tail fixups in the event of -EFSCORRUPTED errors along with -EFSBADCRC. Also, -EFSCORRUPTED can currently be returned from xlog_do_recovery_pass() before rhead_blk is initialized if the first record encountered happens to be corrupted. This leads to an incorrect 'first_bad' return value. Initialize rhead_blk earlier in the function to address that problem as well. Signed-off-by: Brian Foster Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_log_recover.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index a5e2ca8f5cd6..43d5df3a563f 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -1102,7 +1102,7 @@ xlog_verify_tail( first_bad = 0; error = xlog_do_recovery_pass(log, head_blk, *tail_blk, XLOG_RECOVER_CRCPASS, &first_bad); - while (error == -EFSBADCRC && first_bad) { + while ((error == -EFSBADCRC || error == -EFSCORRUPTED) && first_bad) { int tail_distance; /* @@ -1188,7 +1188,7 @@ xlog_verify_head( */ error = xlog_do_recovery_pass(log, *head_blk, tmp_rhead_blk, XLOG_RECOVER_CRCPASS, &first_bad); - if (error == -EFSBADCRC) { + if ((error == -EFSBADCRC || error == -EFSCORRUPTED) && first_bad) { /* * We've hit a potential torn write. Reset the error and warn * about it. @@ -5257,7 +5257,7 @@ xlog_do_recovery_pass( LIST_HEAD (buffer_list); ASSERT(head_blk != tail_blk); - rhead_blk = 0; + blk_no = rhead_blk = tail_blk; for (i = 0; i < XLOG_RHASH_SIZE; i++) INIT_HLIST_HEAD(&rhash[i]); @@ -5335,7 +5335,6 @@ xlog_do_recovery_pass( } memset(rhash, 0, sizeof(rhash)); - blk_no = rhead_blk = tail_blk; if (tail_blk > head_blk) { /* * Perform recovery around the end of the physical log. -- 2.20.1