ocfs2: change slot number type s16 to u16

Dan Carpenter reported the following static checker warning.

	fs/ocfs2/super.c:1269 ocfs2_parse_options() warn: '(-1)' 65535 can't fit into 32767 'mopt->slot'
	fs/ocfs2/suballoc.c:859 ocfs2_init_inode_steal_slot() warn: '(-1)' 65535 can't fit into 32767 'osb->s_inode_steal_slot'
	fs/ocfs2/suballoc.c:867 ocfs2_init_meta_steal_slot() warn: '(-1)' 65535 can't fit into 32767 'osb->s_meta_steal_slot'

That's because OCFS2_INVALID_SLOT is (u16)-1. Slot number in ocfs2 can be
never negative, so change s16 to u16.

Fixes: 9277f8334ffc ("ocfs2: fix value of OCFS2_INVALID_SLOT")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Gang He <ghe@suse.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200627001259.19757-1-junxiao.bi@oracle.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 2dd71d6..7993d52 100644 (file)
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -327,8 +327,8 @@ struct ocfs2_super
        spinlock_t osb_lock;
        u32 s_next_generation;
        unsigned long osb_flags;
-       s16 s_inode_steal_slot;
-       s16 s_meta_steal_slot;
+       u16 s_inode_steal_slot;
+       u16 s_meta_steal_slot;
        atomic_t s_num_inodes_stolen;
        atomic_t s_num_meta_stolen;
 

diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 45745cc..8c8cf7f 100644 (file)
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -879,9 +879,9 @@ static void __ocfs2_set_steal_slot(struct ocfs2_super *osb, int slot, int type)
 {
        spin_lock(&osb->osb_lock);
        if (type == INODE_ALLOC_SYSTEM_INODE)
-               osb->s_inode_steal_slot = slot;
+               osb->s_inode_steal_slot = (u16)slot;
        else if (type == EXTENT_ALLOC_SYSTEM_INODE)
-               osb->s_meta_steal_slot = slot;
+               osb->s_meta_steal_slot = (u16)slot;
        spin_unlock(&osb->osb_lock);
 }
 

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 71ea9ce..1d91dd1 100644 (file)
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -78,7 +78,7 @@ struct mount_options
        unsigned long   commit_interval;
        unsigned long   mount_opt;
        unsigned int    atime_quantum;
-       signed short    slot;
+       unsigned short  slot;
        int             localalloc_opt;
        unsigned int    resv_level;
        int             dir_resv_level;
@@ -1349,7 +1349,7 @@ static int ocfs2_parse_options(struct super_block *sb,
                                goto bail;
                        }
                        if (option)
-                               mopt->slot = (s16)option;
+                               mopt->slot = (u16)option;
                        break;
                case Opt_commit:
                        if (match_int(&args[0], &option)) {