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fuse: Use the high bit of request ID for indicating resend requests

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Some FUSE daemons want to know if the received request is a resend
request. The high bit of the fuse request ID is utilized for indicating
this, enabling the receiver to perform appropriate handling.

The init flag "FUSE_HAS_RESEND" is added to indicate this feature.

Signed-off-by: Zhao Chen <winters.zc@antgroup.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Zhao Chen 2024-01-09 17:24:43 +08:00 committed by Miklos Szeredi
parent 760eac73f9
commit 9e7f5296f4
3 changed files with 15 additions and 2 deletions
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2
fs/fuse/dev.c
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@ -1814,6 +1814,8 @@ static void fuse_resend(struct fuse_conn *fc)
list_for_each_entry_safe(req, next, &to_queue, list) {
__set_bit(FR_PENDING, &req->flags);
/* mark the request as resend request */
req->in.h.unique |= FUSE_UNIQUE_RESEND;
}
spin_lock(&fiq->lock);

2
fs/fuse/inode.c
View File

@ -1370,7 +1370,7 @@ void fuse_send_init(struct fuse_mount *fm)
FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT |
FUSE_SECURITY_CTX | FUSE_CREATE_SUPP_GROUP |
FUSE_HAS_EXPIRE_ONLY | FUSE_DIRECT_IO_ALLOW_MMAP |
FUSE_NO_EXPORT_SUPPORT;
FUSE_NO_EXPORT_SUPPORT | FUSE_HAS_RESEND;
#ifdef CONFIG_FUSE_DAX
if (fm->fc->dax)
flags |= FUSE_MAP_ALIGNMENT;

13
include/uapi/linux/fuse.h
View File

@ -216,7 +216,7 @@
* - add max_stack_depth to fuse_init_out, add FUSE_PASSTHROUGH init flag
* - add backing_id to fuse_open_out, add FOPEN_PASSTHROUGH open flag
* - add FUSE_NO_EXPORT_SUPPORT init flag
* - add FUSE_NOTIFY_RESEND
* - add FUSE_NOTIFY_RESEND, add FUSE_HAS_RESEND init flag
*/
#ifndef _LINUX_FUSE_H
@ -419,6 +419,8 @@ struct fuse_file_lock {
* FUSE_HAS_EXPIRE_ONLY: kernel supports expiry-only entry invalidation
* FUSE_DIRECT_IO_ALLOW_MMAP: allow shared mmap in FOPEN_DIRECT_IO mode.
* FUSE_NO_EXPORT_SUPPORT: explicitly disable export support
* FUSE_HAS_RESEND: kernel supports resending pending requests, and the high bit
* of the request ID indicates resend requests
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -460,6 +462,7 @@ struct fuse_file_lock {
#define FUSE_DIRECT_IO_ALLOW_MMAP (1ULL << 36)
#define FUSE_PASSTHROUGH (1ULL << 37)
#define FUSE_NO_EXPORT_SUPPORT (1ULL << 38)
#define FUSE_HAS_RESEND (1ULL << 39)
/* Obsolete alias for FUSE_DIRECT_IO_ALLOW_MMAP */
#define FUSE_DIRECT_IO_RELAX FUSE_DIRECT_IO_ALLOW_MMAP
@ -973,6 +976,14 @@ struct fuse_fallocate_in {
uint32_t padding;
};
/**
* FUSE request unique ID flag
*
* Indicates whether this is a resend request. The receiver should handle this
* request accordingly.
*/
#define FUSE_UNIQUE_RESEND (1ULL << 63)
struct fuse_in_header {
uint32_t len;
uint32_t opcode;