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ovl: set the ORIGIN type flag

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For directory entries, non zero oe->numlower implies OVL_TYPE_MERGE.
Define a new type flag OVL_TYPE_ORIGIN to indicate that an entry holds a
reference to its lower copy up origin.

For directory entries ORIGIN := MERGE && UPPER. For non-dir entries ORIGIN
means that a lower type dentry has been recently copied up or that we were
able to find the copy up origin from overlay.origin xattr.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2017-04-23 23:12:34 +03:00 committed by Miklos Szeredi
parent a9d019573e
commit 595485033d
2 changed files with 8 additions and 4 deletions
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2
fs/overlayfs/overlayfs.h
View File

@ -13,10 +13,12 @@
enum ovl_path_type { enum ovl_path_type {
__OVL_PATH_UPPER = (1 << 0), __OVL_PATH_UPPER = (1 << 0),
__OVL_PATH_MERGE = (1 << 1), __OVL_PATH_MERGE = (1 << 1),
__OVL_PATH_ORIGIN = (1 << 2),
}; };
#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
#define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN)
#define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay."
#define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque"

10
fs/overlayfs/util.c
View File

@ -83,11 +83,13 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
type = __OVL_PATH_UPPER; type = __OVL_PATH_UPPER;
/* /*
* Non-dir dentry can hold lower dentry from previous * Non-dir dentry can hold lower dentry of its copy up origin.
* location.
*/ */
if (oe->numlower && d_is_dir(dentry)) if (oe->numlower) {
type |= __OVL_PATH_MERGE; type |= __OVL_PATH_ORIGIN;
if (d_is_dir(dentry))
type |= __OVL_PATH_MERGE;
}
} else { } else {
if (oe->numlower > 1) if (oe->numlower > 1)
type |= __OVL_PATH_MERGE; type |= __OVL_PATH_MERGE;