From: Chao Yu Date: Fri, 18 Sep 2015 08:55:26 +0000 (+0800) Subject: f2fs: disallow switch extent_cache option dynamically X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9cd81ce3c2f01fc599b9156b94b868b4f578698c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git f2fs: disallow switch extent_cache option dynamically Swith extent_cache option dynamically when remount may casue consistency issue between extent cache and dnode page. Fix in this patch to avoid that condition. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index f79478115d37..16442ec89489 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -742,6 +742,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data) int err, active_logs; bool need_restart_gc = false; bool need_stop_gc = false; + bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE); sync_filesystem(sb); @@ -767,6 +768,14 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data) if (f2fs_readonly(sb) && (*flags & MS_RDONLY)) goto skip; + /* disallow enable/disable extent_cache dynamically */ + if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) { + err = -EINVAL; + f2fs_msg(sbi->sb, KERN_WARNING, + "switch extent_cache option is not allowed"); + goto restore_opts; + } + /* * We stop the GC thread if FS is mounted as RO * or if background_gc = off is passed in mount