> Allow to change permission masks, allow_utime, errors. But ignore other
> options.
>
> Signed-off-by: Hyunchul Lee <hyc....@gmail.com>
> ---
> fs/exfat/super.c | 40 +++++++++++++++++++++++++++++-----------
> 1 file changed, 29 insertions(+), 11 deletions(-)
>
> diff --git a/fs/exfat/super.c b/fs/exfat/super.c index
> 61c6cf240c19..3c1d47289ba2 100644
> --- a/fs/exfat/super.c
> +++ b/fs/exfat/super.c
> @@ -696,9 +696,13 @@ static void exfat_free(struct fs_context *fc) static int
> exfat_reconfigure(struct fs_context *fc) {
> struct super_block *sb = fc->root->d_sb;
> + struct exfat_sb_info *sbi = EXFAT_SB(sb);
> + struct exfat_mount_options *new_opts;
> int ret;
> bool new_rdonly;
>
> + new_opts = &((struct exfat_sb_info *)fc->s_fs_info)->options;
> +
> new_rdonly = fc->sb_flags & SB_RDONLY;
> if (new_rdonly != sb_rdonly(sb)) {
> if (new_rdonly) {
> @@ -708,6 +712,12 @@ static int exfat_reconfigure(struct fs_context *fc)
> return ret;
> }
> }
> +
> + /* allow to change these options but ignore others */
> + sbi->options.fs_fmask = new_opts->fs_fmask;
> + sbi->options.fs_dmask = new_opts->fs_dmask;
> + sbi->options.allow_utime = new_opts->allow_utime;
> + sbi->options.errors = new_opts->errors;
Is there any reason why you allow a few options on remount ?
> return 0;
> }
>
> @@ -726,17 +736,25 @@ static int exfat_init_fs_context(struct fs_context *fc)
> if (!sbi)
> return -ENOMEM;
>
> - mutex_init(&sbi->s_lock);
> - ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
> - DEFAULT_RATELIMIT_BURST);
> -
> - sbi->options.fs_uid = current_uid();
> - sbi->options.fs_gid = current_gid();
> - sbi->options.fs_fmask = current->fs->umask;
> - sbi->options.fs_dmask = current->fs->umask;
> - sbi->options.allow_utime = -1;
> - sbi->options.iocharset = exfat_default_iocharset;
> - sbi->options.errors = EXFAT_ERRORS_RO;
> + if (fc->root) {
> + /* reconfiguration */
> + memcpy(&sbi->options, &EXFAT_SB(fc->root->d_sb)->options,
> + sizeof(struct exfat_mount_options));
> + sbi->options.iocharset = exfat_default_iocharset;
> + } else {
> + mutex_init(&sbi->s_lock);
> + ratelimit_state_init(&sbi->ratelimit,
> + DEFAULT_RATELIMIT_INTERVAL,
> + DEFAULT_RATELIMIT_BURST);
> +
> + sbi->options.fs_uid = current_uid();
> + sbi->options.fs_gid = current_gid();
> + sbi->options.fs_fmask = current->fs->umask;
> + sbi->options.fs_dmask = current->fs->umask;
> + sbi->options.allow_utime = -1;
> + sbi->options.iocharset = exfat_default_iocharset;
> + sbi->options.errors = EXFAT_ERRORS_RO;
> + }
>
> fc->s_fs_info = sbi;
> fc->ops = &exfat_context_ops;
> --
> 2.17.1
