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jffs2: Fix ignoring mounting options problem during remounting

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commit 08cd274f9b8283a1da93e2ccab216a336da83525 upstream.

The jffs2 mount options will be ignored when remounting jffs2.
It can be easily reproduced with the steps listed below.
1. mount -t jffs2 -o compr=none /dev/mtdblockx /mnt
2. mount -o remount compr=zlib /mnt

Since ec10a24f10, the option parsing happens before fill_super and
then pass fc, which contains the options parsing results, to function
jffs2_reconfigure during remounting. But function jffs2_reconfigure do
not update c->mount_opts.

This patch add a function jffs2_update_mount_opts to fix this problem.

By the way, I notice that tmpfs use the same way to update remounting
options. If it is necessary to unify them?

Cc: <stable@vger.kernel.org>
Fixes: ec10a24f10 ("vfs: Convert jffs2 to use the new mount API")
Signed-off-by: lizhe <lizhe67@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
lizhe 2020-10-14 14:54:42 +08:00 committed by Greg Kroah-Hartman
parent ecdb868acc
commit 1aa8e7801e
1 changed files with 17 additions and 0 deletions
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17
fs/jffs2/super.c
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@ -215,11 +215,28 @@ static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
return 0;
}
static inline void jffs2_update_mount_opts(struct fs_context *fc)
{
struct jffs2_sb_info *new_c = fc->s_fs_info;
struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb);
mutex_lock(&c->alloc_sem);
if (new_c->mount_opts.override_compr) {
c->mount_opts.override_compr = new_c->mount_opts.override_compr;
c->mount_opts.compr = new_c->mount_opts.compr;
}
if (new_c->mount_opts.rp_size)
c->mount_opts.rp_size = new_c->mount_opts.rp_size;
mutex_unlock(&c->alloc_sem);
}
static int jffs2_reconfigure(struct fs_context *fc)
{
struct super_block *sb = fc->root->d_sb;
sync_filesystem(sb);
jffs2_update_mount_opts(fc);
return jffs2_do_remount_fs(sb, fc);
}