diff options
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/Kconfig | 14 | ||||
| -rw-r--r-- | fs/overlayfs/super.c | 5 |
2 files changed, 19 insertions, 0 deletions
diff --git a/fs/overlayfs/Kconfig b/fs/overlayfs/Kconfig index 34355818a2e0..0daac5112f7a 100644 --- a/fs/overlayfs/Kconfig +++ b/fs/overlayfs/Kconfig @@ -8,3 +8,17 @@ config OVERLAY_FS merged with the 'upper' object. For more information see Documentation/filesystems/overlayfs.txt + +config OVERLAY_FS_REDIRECT_DIR + bool "Overlayfs: turn on redirect dir feature by default" + depends on OVERLAY_FS + help + If this config option is enabled then overlay filesystems will use + redirects when renaming directories by default. In this case it is + still possible to turn off redirects globally with the + "redirect_dir=off" module option or on a filesystem instance basis + with the "redirect_dir=off" mount option. + + Note, that redirects are not backward compatible. That is, mounting + an overlay which has redirects on a kernel that doesn't support this + feature will have unexpected results. diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 520f9ab0e9ef..2750aef24d16 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -28,6 +28,10 @@ struct ovl_dir_cache; #define OVL_MAX_STACK 500 +static bool ovl_redirect_dir_def = IS_ENABLED(CONFIG_OVERLAY_FS_REDIRECT_DIR); +module_param_named(redirect_dir, ovl_redirect_dir_def, bool, 0644); +MODULE_PARM_DESC(ovl_redirect_dir_def, + "Default to on or off for the redirect_dir feature"); static void ovl_dentry_release(struct dentry *dentry) { @@ -702,6 +706,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) if (!ufs) goto out; + ufs->config.redirect_dir = ovl_redirect_dir_def; err = ovl_parse_opt((char *) data, &ufs->config); if (err) goto out_free_config; |