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fuse: add feature flag for expire-only

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commit 5cadfbd5a11e5495cac217534c5f788168b1afd7 upstream.

Add an init flag idicating whether the FUSE_EXPIRE_ONLY flag of
FUSE_NOTIFY_INVAL_ENTRY is effective.

This is needed for backports of this feature, otherwise the server could
just check the protocol version.

Fixes: 4f8d37020e1f ("fuse: add "expire only" mode to FUSE_NOTIFY_INVAL_ENTRY")
Cc: <stable@vger.kernel.org> # v6.2
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi
2023-03-27 16:14:49 +02:00
committed by Greg Kroah-Hartman
parent 81eb07e299
commit 2d3bc3d403
2 changed files with 4 additions and 1 deletions
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3
fs/fuse/inode.c
View File

@@ -1327,7 +1327,8 @@ void fuse_send_init(struct fuse_mount *fm)
FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS |
FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA |
FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT |
FUSE_SECURITY_CTX;
FUSE_SECURITY_CTX |
FUSE_HAS_EXPIRE_ONLY;
#ifdef CONFIG_FUSE_DAX
if (fm->fc->dax)
flags |= FUSE_MAP_ALIGNMENT;

2
include/uapi/linux/fuse.h
View File

@@ -365,6 +365,7 @@ struct fuse_file_lock {
* FUSE_SECURITY_CTX: add security context to create, mkdir, symlink, and
* mknod
* FUSE_HAS_INODE_DAX: use per inode DAX
* FUSE_HAS_EXPIRE_ONLY: kernel supports expiry-only entry invalidation
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -401,6 +402,7 @@ struct fuse_file_lock {
/* bits 32..63 get shifted down 32 bits into the flags2 field */
#define FUSE_SECURITY_CTX (1ULL << 32)
#define FUSE_HAS_INODE_DAX (1ULL << 33)
#define FUSE_HAS_EXPIRE_ONLY (1ULL << 35)
/**
* CUSE INIT request/reply flags