diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2024-10-11 11:00:21 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-11-15 11:34:57 +0100 |
| commit | 4a530a7c751d27f9dbd70b7fc45670cd11713b13 (patch) | |
| tree | 457b643c5b44d91433c2e903fa5ec62b823ace79 /include/linux/exportfs.h | |
| parent | 8e929cb546ee42c9a61d24fae60605e9e3192354 (diff) | |
fs: prepare for "explicit connectable" file handles
We would like to use the high 16bit of the handle_type field to encode
file handle traits, such as "connectable".
In preparation for this change, make sure that filesystems do not return
a handle_type value with upper bits set and that the open_by_handle_at(2)
syscall rejects these handle types.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20241011090023.655623-2-amir73il@gmail.com
Fixes: 570df4e9c23f ("ceph: snapshot nfs re-export")
Acked-by:
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include/linux/exportfs.h')
| -rw-r--r-- | include/linux/exportfs.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h index 893a1d21dc1c..5e14d4500a75 100644 --- a/include/linux/exportfs.h +++ b/include/linux/exportfs.h @@ -160,6 +160,17 @@ struct fid { #define EXPORT_FH_FID 0x2 /* File handle may be non-decodeable */ #define EXPORT_FH_DIR_ONLY 0x4 /* Only decode file handle for a directory */ +/* + * Filesystems use only lower 8 bits of file_handle type for fid_type. + * name_to_handle_at() uses upper 16 bits of type as user flags to be + * interpreted by open_by_handle_at(). + */ +#define FILEID_USER_FLAGS_MASK 0xffff0000 +#define FILEID_USER_FLAGS(type) ((type) & FILEID_USER_FLAGS_MASK) + +/* Flags supported in encoded handle_type that is exported to user */ +#define FILEID_VALID_USER_FLAGS (0) + /** * struct export_operations - for nfsd to communicate with file systems * @encode_fh: encode a file handle fragment from a dentry |