ubifs: remove unnecessary check in ubifs_log_start_commit
In ubifs_log_start_commit, the value of c->lhead_offs is zero or set
to zero by code bellow.
/* Switch to the next log LEB */
if (c->lhead_offs) {
c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
ubifs_assert(c->lhead_lnum != c->ltail_lnum);
c->lhead_offs = 0;
}
The value of 'len' can not exceed 'max_len' which assigned value by
code bellow.
max_len = UBIFS_CS_NODE_SZ + c->jhead_cnt * UBIFS_REF_NODE_SZ;
The value of c->lhead_offs changed by code bellow and cannot exceed
'max_len'.
c->lhead_offs += len;
if (c->lhead_offs == c->leb_size) {
c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
c->lhead_offs = 0;
}
Usually, the size of PEB is between 64KB and 256KB. So the value of
c->lhead_offs is far less than c->leb_size. The check
'if (c->lhead_offs == c->leb_size)' could never to be true.
Signed-off-by: Liu Song <liu.song11@zte.com.cn>
Reviewed-by: Jiang Biao <jiang.biao2@zte.com.cn>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/fs/ubifs/log.c b/fs/ubifs/log.c
index cd85d7d..b6ac9c4 100644
--- a/fs/ubifs/log.c
+++ b/fs/ubifs/log.c
@@ -438,10 +438,7 @@ int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
*ltail_lnum = c->lhead_lnum;
c->lhead_offs += len;
- if (c->lhead_offs == c->leb_size) {
- c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
- c->lhead_offs = 0;
- }
+ ubifs_assert(c, c->lhead_offs < c->leb_size);
remove_buds(c);
