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| author | Chengguang Xu <cgxu519@mykernel.net> | 2020-04-22 12:28:43 +0800 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-05-13 11:11:24 +0200 |
| commit | 399c109d357a7e217cf7ef551e7e234439c68c15 (patch) | |
| tree | 6947c756bd5dc797715cba6d75af5c6b610f3512 /fs/overlayfs/super.c | |
| parent | c21c839b8448dd4b1e37ffc1bde928f57d34c0db (diff) | |
| download | linux-399c109d357a7e217cf7ef551e7e234439c68c15.tar.bz2 | |
ovl: sync dirty data when remounting to ro mode
sync_filesystem() does not sync dirty data for readonly filesystem during
umount, so before changing to readonly filesystem we should sync dirty data
for data integrity.
Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/super.c')
| -rw-r--r-- | fs/overlayfs/super.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index a88a7badf444..60dfb27bc12b 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -365,11 +365,20 @@ static int ovl_show_options(struct seq_file *m, struct dentry *dentry) static int ovl_remount(struct super_block *sb, int *flags, char *data) { struct ovl_fs *ofs = sb->s_fs_info; + struct super_block *upper_sb; + int ret = 0; if (!(*flags & SB_RDONLY) && ovl_force_readonly(ofs)) return -EROFS; - return 0; + if (*flags & SB_RDONLY && !sb_rdonly(sb)) { + upper_sb = ofs->upper_mnt->mnt_sb; + down_read(&upper_sb->s_umount); + ret = sync_filesystem(upper_sb); + up_read(&upper_sb->s_umount); + } + + return ret; } static const struct super_operations ovl_super_operations = { |