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ovl: encode pure upper file handles

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Encode overlay file handles as struct ovl_fh containing the file handle
encoding of the real upper inode.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-07-12 14:17:16 +03:00
committed by Miklos Szeredi
parent a01f64b5c0
commit 8ed5eec9d6
3 changed files with 106 additions and 1 deletions
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6
fs/overlayfs/overlayfs.h
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@@ -68,6 +68,9 @@ enum ovl_entry_flag {
#error Endianness not defined
#endif
/* The type returned by overlay exportfs ops when encoding an ovl_fh handle */
#define OVL_FILEID 0xfb
/* On-disk and in-memeory format for redirect by file handle */
struct ovl_fh {
u8 version; /* 0 */
@@ -351,3 +354,6 @@ int ovl_set_attr(struct dentry *upper, struct kstat *stat);
struct ovl_fh *ovl_encode_fh(struct dentry *real, bool is_upper);
int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
struct dentry *upper);
/* export.c */
extern const struct export_operations ovl_export_operations;