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ovl: add ovl_allow_offline_changes() helper

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Allows to check whether any of extended features are enabled

Signed-off-by: Vyacheslav Yurkov <Vyacheslav.Yurkov@bruker.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Vyacheslav Yurkov 2021-05-27 19:45:46 +02:00 committed by Miklos Szeredi
parent e4522bc873
commit ca45275cd6
2 changed files with 13 additions and 3 deletions
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12
fs/overlayfs/overlayfs.h
View File

@ -263,6 +263,18 @@ static inline bool ovl_open_flags_need_copy_up(int flags)
return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
}
static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
{
/*
* To avoid regressions in existing setups with overlay lower offline
* changes, we allow lower changes only if none of the new features
* are used.
*/
return (!ofs->config.index && !ofs->config.metacopy &&
!ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON);
}
/* util.c */
int ovl_want_write(struct dentry *dentry);
void ovl_drop_write(struct dentry *dentry);

4
fs/overlayfs/super.c
View File

@ -1599,9 +1599,7 @@ static bool ovl_lower_uuid_ok(struct ovl_fs *ofs, const uuid_t *uuid)
* user opted-in to one of the new features that require following the
* lower inode of non-dir upper.
*/
if (!ofs->config.index && !ofs->config.metacopy &&
!ofs->config.redirect_dir && ofs->config.xino != OVL_XINO_ON &&
uuid_is_null(uuid))
if (ovl_allow_offline_changes(ofs) && uuid_is_null(uuid))
return false;
for (i = 0; i < ofs->numfs; i++) {