From 377e208f44784174f3002d9892d553715a3ab71b Mon Sep 17 00:00:00 2001 From: Richard Weinberger Date: Tue, 13 Aug 2019 23:55:48 +0200 Subject: [PATCH] ubifs: Correctly initialize c->min_log_bytes MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Currently on a freshly mounted UBIFS, c->min_log_bytes is 0. This can lead to a log overrun and make commits fail. Recent kernels will report the following assert: UBIFS assert failed: c->lhead_lnum != c->ltail_lnum, in fs/ubifs/log.c:412 c->min_log_bytes can have two states, 0 and c->leb_size. It controls how much bytes of the log area are reserved for non-bud nodes such as commit nodes. After a commit it has to be set to c->leb_size such that we have always enough space for a commit. While a commit runs it can be 0 to make the remaining bytes of the log available to writers. Having it set to 0 right after mount is wrong since no space for commits is reserved. Fixes: 1e51764a3c2ac ("UBIFS: add new flash file system") Reported-and-tested-by: Uwe Kleine-König Signed-off-by: Richard Weinberger --- fs/ubifs/super.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 2c0803b0ac3a..8c1d571334bc 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -609,6 +609,10 @@ static int init_constants_early(struct ubifs_info *c) c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; if (c->max_bu_buf_len > c->leb_size) c->max_bu_buf_len = c->leb_size; + + /* Log is ready, preserve one LEB for commits. */ + c->min_log_bytes = c->leb_size; + return 0; } -- 2.30.2