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fuse: convert init to simple api 

Bypass the fc->initialized check by setting the force flag.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
alistair/sunxi64-5.4-dsi
Miklos Szeredi 2019-09-10 15:04:10 +02:00
parent 33826ebbbe
commit 615047eff1
1 changed files with 38 additions and 29 deletions
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67
fs/fuse/inode.c
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@ -874,11 +874,19 @@ static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
spin_unlock(&fc->bg_lock);
}
static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
{
struct fuse_init_out *arg = &req->misc.init_out;
struct fuse_init_args {
struct fuse_args args;
struct fuse_init_in in;
struct fuse_init_out out;
};
if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
static void process_init_reply(struct fuse_conn *fc, struct fuse_args *args,
int error)
{
struct fuse_init_args *ia = container_of(args, typeof(*ia), args);
struct fuse_init_out *arg = &ia->out;
if (error || arg->major != FUSE_KERNEL_VERSION)
fc->conn_error = 1;
else {
unsigned long ra_pages;
@ -955,18 +963,23 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->max_write = max_t(unsigned, 4096, fc->max_write);
fc->conn_init = 1;
}
kfree(ia);
fuse_set_initialized(fc);
wake_up_all(&fc->blocked_waitq);
}
static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
static void fuse_send_init(struct fuse_conn *fc)
{
struct fuse_init_in *arg = &req->misc.init_in;
struct fuse_init_args *ia;
arg->major = FUSE_KERNEL_VERSION;
arg->minor = FUSE_KERNEL_MINOR_VERSION;
arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE;
arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL);
ia->in.major = FUSE_KERNEL_VERSION;
ia->in.minor = FUSE_KERNEL_MINOR_VERSION;
ia->in.max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE;
ia->in.flags |=
FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
@ -975,19 +988,23 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL |
FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS |
FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
req->in.args[0].value = arg;
req->out.numargs = 1;
ia->args.opcode = FUSE_INIT;
ia->args.in_numargs = 1;
ia->args.in_args[0].size = sizeof(ia->in);
ia->args.in_args[0].value = &ia->in;
ia->args.out_numargs = 1;
/* Variable length argument used for backward compatibility
with interface version < 7.5. Rest of init_out is zeroed
by do_get_request(), so a short reply is not a problem */
req->out.argvar = 1;
req->out.args[0].size = sizeof(struct fuse_init_out);
req->out.args[0].value = &req->misc.init_out;
req->end = process_init_reply;
fuse_request_send_background(fc, req);
ia->args.out_argvar = 1;
ia->args.out_args[0].size = sizeof(ia->out);
ia->args.out_args[0].value = &ia->out;
ia->args.force = true;
ia->args.nocreds = true;
ia->args.end = process_init_reply;
if (fuse_simple_background(fc, &ia->args, GFP_KERNEL) != 0)
process_init_reply(fc, &ia->args, -ENOTCONN);
}
static void fuse_free_conn(struct fuse_conn *fc)
@ -1087,7 +1104,6 @@ static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
struct inode *root;
struct file *file;
struct dentry *root_dentry;
struct fuse_req *init_req;
int err;
int is_bdev = sb->s_bdev != NULL;
@ -1182,11 +1198,6 @@ static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
/* Root dentry doesn't have .d_revalidate */
sb->s_d_op = &fuse_dentry_operations;
init_req = fuse_request_alloc(0);
if (!init_req)
goto err_put_root;
__set_bit(FR_BACKGROUND, &init_req->flags);
mutex_lock(&fuse_mutex);
err = -EINVAL;
if (file->private_data)
@ -1207,14 +1218,12 @@ static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
*/
fput(file);
fuse_send_init(fc, init_req);
fuse_send_init(fc);
return 0;
err_unlock:
mutex_unlock(&fuse_mutex);
fuse_request_free(init_req);
err_put_root:
dput(root_dentry);
err_dev_free:
fuse_dev_free(fud);