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From 4df08719f3415cde6f802a755922b7f76e198cd7 Mon Sep 17 00:00:00 2001
From: Dharmendra Singh <dsingh@ddn.com>
Date: Mon, 28 Feb 2022 11:15:06 +0000
Subject: [PATCH] Modify structures in libfuse to handle flags beyond 32 bits.
In fuse kernel, 'commit 53db28933e95 ("fuse: extend init flags")'
made the changes to handle flags going beyond 32 bits but i think
changes were not done in libfuse to handle the same.
This patch prepares the ground in libfuse for incoming FUSE kernel
patches (Atomic open + lookup) where flags went beyond 32 bits.
It makes struct same as in fuse kernel resulting in name change of
few fields.
---
include/fuse_kernel.h | 8 ++++-
lib/fuse_lowlevel.c | 75 ++++++++++++++++++++++++++++----------------------
2 files changed, 48 insertions(+), 35 deletions(-)
--- a/include/fuse_kernel.h
+++ b/include/fuse_kernel.h
@@ -272,6 +272,7 @@ struct fuse_file_lock {
#define FUSE_POSIX_ACL (1 << 20)
#define FUSE_MAX_PAGES (1 << 22)
#define FUSE_CACHE_SYMLINKS (1 << 23)
+#define FUSE_INIT_EXT (1 << 30)
/**
* CUSE INIT request/reply flags
@@ -596,6 +597,8 @@ struct fuse_init_in {
uint32_t minor;
uint32_t max_readahead;
uint32_t flags;
+ uint32_t flags2;
+ uint32_t unused[11];
};
#define FUSE_COMPAT_INIT_OUT_SIZE 8
@@ -611,8 +614,9 @@ struct fuse_init_out {
uint32_t max_write;
uint32_t time_gran;
uint16_t max_pages;
- uint16_t padding;
- uint32_t unused[8];
+ uint16_t map_alignment;
+ uint32_t flags2;
+ uint32_t unused[7];
};
#define CUSE_INIT_INFO_MAX 4096
--- a/lib/fuse_lowlevel.c
+++ b/lib/fuse_lowlevel.c
@@ -1819,7 +1819,8 @@ static void do_init(fuse_req_t req, fuse
struct fuse_session *se = req->se;
size_t bufsize = se->bufsize;
size_t outargsize = sizeof(outarg);
-
+ uint64_t inargflags = 0;
+ uint64_t outargflags = 0;
(void) nodeid;
if (se->debug) {
fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor);
@@ -1854,39 +1855,42 @@ static void do_init(fuse_req_t req, fuse
if (arg->minor >= 6) {
if (arg->max_readahead < se->conn.max_readahead)
se->conn.max_readahead = arg->max_readahead;
- if (arg->flags & FUSE_ASYNC_READ)
+ inargflags = arg->flags;
+ if (inargflags & FUSE_INIT_EXT)
+ inargflags = inargflags | (uint64_t) arg->flags2 << 32;
+ if (inargflags & FUSE_ASYNC_READ)
se->conn.capable |= FUSE_CAP_ASYNC_READ;
- if (arg->flags & FUSE_POSIX_LOCKS)
+ if (inargflags & FUSE_POSIX_LOCKS)
se->conn.capable |= FUSE_CAP_POSIX_LOCKS;
- if (arg->flags & FUSE_ATOMIC_O_TRUNC)
+ if (inargflags & FUSE_ATOMIC_O_TRUNC)
se->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC;
- if (arg->flags & FUSE_EXPORT_SUPPORT)
+ if (inargflags & FUSE_EXPORT_SUPPORT)
se->conn.capable |= FUSE_CAP_EXPORT_SUPPORT;
- if (arg->flags & FUSE_DONT_MASK)
+ if (inargflags & FUSE_DONT_MASK)
se->conn.capable |= FUSE_CAP_DONT_MASK;
- if (arg->flags & FUSE_FLOCK_LOCKS)
+ if (inargflags & FUSE_FLOCK_LOCKS)
se->conn.capable |= FUSE_CAP_FLOCK_LOCKS;
- if (arg->flags & FUSE_AUTO_INVAL_DATA)
+ if (inargflags & FUSE_AUTO_INVAL_DATA)
se->conn.capable |= FUSE_CAP_AUTO_INVAL_DATA;
- if (arg->flags & FUSE_DO_READDIRPLUS)
+ if (inargflags & FUSE_DO_READDIRPLUS)
se->conn.capable |= FUSE_CAP_READDIRPLUS;
- if (arg->flags & FUSE_READDIRPLUS_AUTO)
+ if (inargflags & FUSE_READDIRPLUS_AUTO)
se->conn.capable |= FUSE_CAP_READDIRPLUS_AUTO;
- if (arg->flags & FUSE_ASYNC_DIO)
+ if (inargflags & FUSE_ASYNC_DIO)
se->conn.capable |= FUSE_CAP_ASYNC_DIO;
- if (arg->flags & FUSE_WRITEBACK_CACHE)
+ if (inargflags & FUSE_WRITEBACK_CACHE)
se->conn.capable |= FUSE_CAP_WRITEBACK_CACHE;
- if (arg->flags & FUSE_NO_OPEN_SUPPORT)
+ if (inargflags & FUSE_NO_OPEN_SUPPORT)
se->conn.capable |= FUSE_CAP_NO_OPEN_SUPPORT;
- if (arg->flags & FUSE_PARALLEL_DIROPS)
+ if (inargflags & FUSE_PARALLEL_DIROPS)
se->conn.capable |= FUSE_CAP_PARALLEL_DIROPS;
- if (arg->flags & FUSE_POSIX_ACL)
+ if (inargflags & FUSE_POSIX_ACL)
se->conn.capable |= FUSE_CAP_POSIX_ACL;
- if (arg->flags & FUSE_HANDLE_KILLPRIV)
+ if (inargflags & FUSE_HANDLE_KILLPRIV)
se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV;
- if (arg->flags & FUSE_CACHE_SYMLINKS)
+ if (inargflags & FUSE_CACHE_SYMLINKS)
se->conn.capable |= FUSE_CAP_CACHE_SYMLINKS;
- if (!(arg->flags & FUSE_MAX_PAGES)) {
+ if (!(inargflags & FUSE_MAX_PAGES)) {
size_t max_bufsize =
FUSE_DEFAULT_MAX_PAGES_PER_REQ * getpagesize()
+ FUSE_BUFFER_HEADER_SIZE;
@@ -1977,37 +1981,42 @@ static void do_init(fuse_req_t req, fuse
outarg.flags |= FUSE_MAX_PAGES;
outarg.max_pages = (se->conn.max_write - 1) / getpagesize() + 1;
}
-
+ outargflags = outarg.flags;
/* Always enable big writes, this is superseded
by the max_write option */
- outarg.flags |= FUSE_BIG_WRITES;
+ outargflags |= FUSE_BIG_WRITES;
if (se->conn.want & FUSE_CAP_ASYNC_READ)
- outarg.flags |= FUSE_ASYNC_READ;
+ outargflags |= FUSE_ASYNC_READ;
if (se->conn.want & FUSE_CAP_POSIX_LOCKS)
- outarg.flags |= FUSE_POSIX_LOCKS;
+ outargflags |= FUSE_POSIX_LOCKS;
if (se->conn.want & FUSE_CAP_ATOMIC_O_TRUNC)
- outarg.flags |= FUSE_ATOMIC_O_TRUNC;
+ outargflags |= FUSE_ATOMIC_O_TRUNC;
if (se->conn.want & FUSE_CAP_EXPORT_SUPPORT)
- outarg.flags |= FUSE_EXPORT_SUPPORT;
+ outargflags |= FUSE_EXPORT_SUPPORT;
if (se->conn.want & FUSE_CAP_DONT_MASK)
- outarg.flags |= FUSE_DONT_MASK;
+ outargflags |= FUSE_DONT_MASK;
if (se->conn.want & FUSE_CAP_FLOCK_LOCKS)
- outarg.flags |= FUSE_FLOCK_LOCKS;
+ outargflags |= FUSE_FLOCK_LOCKS;
if (se->conn.want & FUSE_CAP_AUTO_INVAL_DATA)
- outarg.flags |= FUSE_AUTO_INVAL_DATA;
+ outargflags |= FUSE_AUTO_INVAL_DATA;
if (se->conn.want & FUSE_CAP_READDIRPLUS)
- outarg.flags |= FUSE_DO_READDIRPLUS;
+ outargflags |= FUSE_DO_READDIRPLUS;
if (se->conn.want & FUSE_CAP_READDIRPLUS_AUTO)
- outarg.flags |= FUSE_READDIRPLUS_AUTO;
+ outargflags |= FUSE_READDIRPLUS_AUTO;
if (se->conn.want & FUSE_CAP_ASYNC_DIO)
- outarg.flags |= FUSE_ASYNC_DIO;
+ outargflags |= FUSE_ASYNC_DIO;
if (se->conn.want & FUSE_CAP_WRITEBACK_CACHE)
- outarg.flags |= FUSE_WRITEBACK_CACHE;
+ outargflags |= FUSE_WRITEBACK_CACHE;
if (se->conn.want & FUSE_CAP_POSIX_ACL)
- outarg.flags |= FUSE_POSIX_ACL;
+ outargflags |= FUSE_POSIX_ACL;
if (se->conn.want & FUSE_CAP_CACHE_SYMLINKS)
- outarg.flags |= FUSE_CACHE_SYMLINKS;
+ outargflags |= FUSE_CACHE_SYMLINKS;
+
+ outarg.flags = outargflags;
+
+ if (inargflags & FUSE_INIT_EXT)
+ outarg.flags2 = outargflags >> 32;
outarg.max_readahead = se->conn.max_readahead;
outarg.max_write = se->conn.max_write;
if (se->conn.proto_minor >= 13) {
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