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Commit 7b1373dd authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'fuse-update-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 

Pull fuse updates from Miklos Szeredi:

 - Continue separating the transport (user/kernel communication) and the
   filesystem layers of fuse. Getting rid of most layering violations
   will allow for easier cleanup and optimization later on.

 - Prepare for the addition of the virtio-fs filesystem. The actual
   filesystem will be introduced by a separate pull request.

 - Convert to new mount API.

 - Various fixes, optimizations and cleanups.

* tag 'fuse-update-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (55 commits)
  fuse: Make fuse_args_to_req static
  fuse: fix memleak in cuse_channel_open
  fuse: fix beyond-end-of-page access in fuse_parse_cache()
  fuse: unexport fuse_put_request
  fuse: kmemcg account fs data
  fuse: on 64-bit store time in d_fsdata directly
  fuse: fix missing unlock_page in fuse_writepage()
  fuse: reserve byteswapped init opcodes
  fuse: allow skipping control interface and forced unmount
  fuse: dissociate DESTROY from fuseblk
  fuse: delete dentry if timeout is zero
  fuse: separate fuse device allocation and installation in fuse_conn
  fuse: add fuse_iqueue_ops callbacks
  fuse: extract fuse_fill_super_common()
  fuse: export fuse_dequeue_forget() function
  fuse: export fuse_get_unique()
  fuse: export fuse_send_init_request()
  fuse: export fuse_len_args()
  fuse: export fuse_end_request()
  fuse: fix request limit
  ...
parents 301310c6 5addcd5d

fs/fs_context.c

+0 −14
Original line number Diff line number Diff line
@@ -504,7 +504,6 @@ void put_fs_context(struct fs_context *fc) 
	put_net(fc->net_ns);

	put_user_ns(fc->user_ns);

	put_cred(fc->cred);

	kfree(fc->subtype);

	put_fc_log(fc);

	put_filesystem(fc->fs_type);

	kfree(fc->source);
@@ -571,17 +570,6 @@ static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param) 
		return 0;

	}



	if ((fc->fs_type->fs_flags & FS_HAS_SUBTYPE) &&

	    strcmp(param->key, "subtype") == 0) {

		if (param->type != fs_value_is_string)

			return invalf(fc, "VFS: Legacy: Non-string subtype");

		if (fc->subtype)

			return invalf(fc, "VFS: Legacy: Multiple subtype");

		fc->subtype = param->string;

		param->string = NULL;

		return 0;

	}



	if (ctx->param_type == LEGACY_FS_MONOLITHIC_PARAMS)

		return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options");
@@ -738,8 +726,6 @@ void vfs_clean_context(struct fs_context *fc) 
	fc->s_fs_info = NULL;

	fc->sb_flags = 0;

	security_free_mnt_opts(&fc->security);

	kfree(fc->subtype);

	fc->subtype = NULL;

	kfree(fc->source);

	fc->source = NULL;

fs/fuse/cuse.c

+52 −49
Original line number Diff line number Diff line
@@ -142,11 +142,10 @@ static int cuse_open(struct inode *inode, struct file *file) 


static int cuse_release(struct inode *inode, struct file *file)

{

	struct fuse_inode *fi = get_fuse_inode(inode);

	struct fuse_file *ff = file->private_data;

	struct fuse_conn *fc = ff->fc;



	fuse_sync_release(fi, ff, file->f_flags);

	fuse_sync_release(NULL, ff, file->f_flags);

	fuse_conn_put(fc);



	return 0;
@@ -299,6 +298,14 @@ static void cuse_gendev_release(struct device *dev) 
	kfree(dev);

}



struct cuse_init_args {

	struct fuse_args_pages ap;

	struct cuse_init_in in;

	struct cuse_init_out out;

	struct page *page;

	struct fuse_page_desc desc;

};



/**

 * cuse_process_init_reply - finish initializing CUSE channel

 *
@@ -306,21 +313,22 @@ static void cuse_gendev_release(struct device *dev) 
 * required data structures for it.  Please read the comment at the

 * top of this file for high level overview.

 */

static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)

static void cuse_process_init_reply(struct fuse_conn *fc,

				    struct fuse_args *args, int error)

{

	struct cuse_init_args *ia = container_of(args, typeof(*ia), ap.args);

	struct fuse_args_pages *ap = &ia->ap;

	struct cuse_conn *cc = fc_to_cc(fc), *pos;

	struct cuse_init_out *arg = req->out.args[0].value;

	struct page *page = req->pages[0];

	struct cuse_init_out *arg = &ia->out;

	struct page *page = ap->pages[0];

	struct cuse_devinfo devinfo = { };

	struct device *dev;

	struct cdev *cdev;

	dev_t devt;

	int rc, i;



	if (req->out.h.error ||

	    arg->major != FUSE_KERNEL_VERSION || arg->minor < 11) {

	if (error || arg->major != FUSE_KERNEL_VERSION || arg->minor < 11)

		goto err;

	}



	fc->minor = arg->minor;

	fc->max_read = max_t(unsigned, arg->max_read, 4096);
@@ -329,7 +337,7 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 
	/* parse init reply */

	cc->unrestricted_ioctl = arg->flags & CUSE_UNRESTRICTED_IOCTL;



	rc = cuse_parse_devinfo(page_address(page), req->out.args[1].size,

	rc = cuse_parse_devinfo(page_address(page), ap->args.out_args[1].size,

				&devinfo);

	if (rc)

		goto err;
@@ -396,7 +404,7 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 
	dev_set_uevent_suppress(dev, 0);

	kobject_uevent(&dev->kobj, KOBJ_ADD);

out:

	kfree(arg);

	kfree(ia);

	__free_page(page);

	return;
@@ -415,55 +423,49 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) 
static int cuse_send_init(struct cuse_conn *cc)

{

	int rc;

	struct fuse_req *req;

	struct page *page;

	struct fuse_conn *fc = &cc->fc;

	struct cuse_init_in *arg;

	void *outarg;

	struct cuse_init_args *ia;

	struct fuse_args_pages *ap;



	BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE);



	req = fuse_get_req_for_background(fc, 1);

	if (IS_ERR(req)) {

		rc = PTR_ERR(req);

		goto err;

	}



	rc = -ENOMEM;

	page = alloc_page(GFP_KERNEL | __GFP_ZERO);

	if (!page)

		goto err_put_req;

		goto err;



	outarg = kzalloc(sizeof(struct cuse_init_out), GFP_KERNEL);

	if (!outarg)

	ia = kzalloc(sizeof(*ia), GFP_KERNEL);

	if (!ia)

		goto err_free_page;



	arg = &req->misc.cuse_init_in;

	arg->major = FUSE_KERNEL_VERSION;

	arg->minor = FUSE_KERNEL_MINOR_VERSION;

	arg->flags |= CUSE_UNRESTRICTED_IOCTL;

	req->in.h.opcode = CUSE_INIT;

	req->in.numargs = 1;

	req->in.args[0].size = sizeof(struct cuse_init_in);

	req->in.args[0].value = arg;

	req->out.numargs = 2;

	req->out.args[0].size = sizeof(struct cuse_init_out);

	req->out.args[0].value = outarg;

	req->out.args[1].size = CUSE_INIT_INFO_MAX;

	req->out.argvar = 1;

	req->out.argpages = 1;

	req->pages[0] = page;

	req->page_descs[0].length = req->out.args[1].size;

	req->num_pages = 1;

	req->end = cuse_process_init_reply;

	fuse_request_send_background(fc, req);



	return 0;



	ap = &ia->ap;

	ia->in.major = FUSE_KERNEL_VERSION;

	ia->in.minor = FUSE_KERNEL_MINOR_VERSION;

	ia->in.flags |= CUSE_UNRESTRICTED_IOCTL;

	ap->args.opcode = CUSE_INIT;

	ap->args.in_numargs = 1;

	ap->args.in_args[0].size = sizeof(ia->in);

	ap->args.in_args[0].value = &ia->in;

	ap->args.out_numargs = 2;

	ap->args.out_args[0].size = sizeof(ia->out);

	ap->args.out_args[0].value = &ia->out;

	ap->args.out_args[1].size = CUSE_INIT_INFO_MAX;

	ap->args.out_argvar = 1;

	ap->args.out_pages = 1;

	ap->num_pages = 1;

	ap->pages = &ia->page;

	ap->descs = &ia->desc;

	ia->page = page;

	ia->desc.length = ap->args.out_args[1].size;

	ap->args.end = cuse_process_init_reply;



	rc = fuse_simple_background(fc, &ap->args, GFP_KERNEL);

	if (rc) {

		kfree(ia);

err_free_page:

		__free_page(page);

err_put_req:

	fuse_put_request(fc, req);

	}

err:

	return rc;

}
@@ -504,9 +506,9 @@ static int cuse_channel_open(struct inode *inode, struct file *file) 
	 * Limit the cuse channel to requests that can

	 * be represented in file->f_cred->user_ns.

	 */

	fuse_conn_init(&cc->fc, file->f_cred->user_ns);

	fuse_conn_init(&cc->fc, file->f_cred->user_ns, &fuse_dev_fiq_ops, NULL);



	fud = fuse_dev_alloc(&cc->fc);

	fud = fuse_dev_alloc_install(&cc->fc);

	if (!fud) {

		kfree(cc);

		return -ENOMEM;
@@ -519,6 +521,7 @@ static int cuse_channel_open(struct inode *inode, struct file *file) 
	rc = cuse_send_init(cc);

	if (rc) {

		fuse_dev_free(fud);

		fuse_conn_put(&cc->fc);

		return rc;

	}

	file->private_data = fud;

fs/fuse/dev.c

+280 −374

File changed.

Preview size limit exceeded, changes collapsed.

fs/fuse/dir.c

+164 −119
Original line number Diff line number Diff line
@@ -24,20 +24,54 @@ static void fuse_advise_use_readdirplus(struct inode *dir) 
	set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);

}



#if BITS_PER_LONG >= 64

static inline void __fuse_dentry_settime(struct dentry *entry, u64 time)

{

	entry->d_fsdata = (void *) time;

}



static inline u64 fuse_dentry_time(const struct dentry *entry)

{

	return (u64)entry->d_fsdata;

}



#else

union fuse_dentry {

	u64 time;

	struct rcu_head rcu;

};



static inline void fuse_dentry_settime(struct dentry *entry, u64 time)

static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time)

{

	((union fuse_dentry *) entry->d_fsdata)->time = time;

	((union fuse_dentry *) dentry->d_fsdata)->time = time;

}



static inline u64 fuse_dentry_time(struct dentry *entry)

static inline u64 fuse_dentry_time(const struct dentry *entry)

{

	return ((union fuse_dentry *) entry->d_fsdata)->time;

}

#endif



static void fuse_dentry_settime(struct dentry *dentry, u64 time)

{

	struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb);

	bool delete = !time && fc->delete_stale;

	/*

	 * Mess with DCACHE_OP_DELETE because dput() will be faster without it.

	 * Don't care about races, either way it's just an optimization

	 */

	if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) ||

	    (delete && !(dentry->d_flags & DCACHE_OP_DELETE))) {

		spin_lock(&dentry->d_lock);

		if (!delete)

			dentry->d_flags &= ~DCACHE_OP_DELETE;

		else

			dentry->d_flags |= DCACHE_OP_DELETE;

		spin_unlock(&dentry->d_lock);

	}



	__fuse_dentry_settime(dentry, time);

}



/*

 * FUSE caches dentries and attributes with separate timeout.  The
@@ -139,14 +173,14 @@ static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, 
			     struct fuse_entry_out *outarg)

{

	memset(outarg, 0, sizeof(struct fuse_entry_out));

	args->in.h.opcode = FUSE_LOOKUP;

	args->in.h.nodeid = nodeid;

	args->in.numargs = 1;

	args->in.args[0].size = name->len + 1;

	args->in.args[0].value = name->name;

	args->out.numargs = 1;

	args->out.args[0].size = sizeof(struct fuse_entry_out);

	args->out.args[0].value = outarg;

	args->opcode = FUSE_LOOKUP;

	args->nodeid = nodeid;

	args->in_numargs = 1;

	args->in_args[0].size = name->len + 1;

	args->in_args[0].value = name->name;

	args->out_numargs = 1;

	args->out_args[0].size = sizeof(struct fuse_entry_out);

	args->out_args[0].value = outarg;

}



/*
@@ -242,9 +276,11 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) 
	goto out;

}



#if BITS_PER_LONG < 64

static int fuse_dentry_init(struct dentry *dentry)

{

	dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL);

	dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry),

				   GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE);



	return dentry->d_fsdata ? 0 : -ENOMEM;

}
@@ -254,16 +290,27 @@ static void fuse_dentry_release(struct dentry *dentry) 


	kfree_rcu(fd, rcu);

}

#endif



static int fuse_dentry_delete(const struct dentry *dentry)

{

	return time_before64(fuse_dentry_time(dentry), get_jiffies_64());

}



const struct dentry_operations fuse_dentry_operations = {

	.d_revalidate	= fuse_dentry_revalidate,

	.d_delete	= fuse_dentry_delete,

#if BITS_PER_LONG < 64

	.d_init		= fuse_dentry_init,

	.d_release	= fuse_dentry_release,

#endif

};



const struct dentry_operations fuse_root_dentry_operations = {

#if BITS_PER_LONG < 64

	.d_init		= fuse_dentry_init,

	.d_release	= fuse_dentry_release,

#endif

};



int fuse_valid_type(int m)
@@ -410,18 +457,18 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, 
	inarg.flags = flags;

	inarg.mode = mode;

	inarg.umask = current_umask();

	args.in.h.opcode = FUSE_CREATE;

	args.in.h.nodeid = get_node_id(dir);

	args.in.numargs = 2;

	args.in.args[0].size = sizeof(inarg);

	args.in.args[0].value = &inarg;

	args.in.args[1].size = entry->d_name.len + 1;

	args.in.args[1].value = entry->d_name.name;

	args.out.numargs = 2;

	args.out.args[0].size = sizeof(outentry);

	args.out.args[0].value = &outentry;

	args.out.args[1].size = sizeof(outopen);

	args.out.args[1].value = &outopen;

	args.opcode = FUSE_CREATE;

	args.nodeid = get_node_id(dir);

	args.in_numargs = 2;

	args.in_args[0].size = sizeof(inarg);

	args.in_args[0].value = &inarg;

	args.in_args[1].size = entry->d_name.len + 1;

	args.in_args[1].value = entry->d_name.name;

	args.out_numargs = 2;

	args.out_args[0].size = sizeof(outentry);

	args.out_args[0].value = &outentry;

	args.out_args[1].size = sizeof(outopen);

	args.out_args[1].value = &outopen;

	err = fuse_simple_request(fc, &args);

	if (err)

		goto out_free_ff;
@@ -526,10 +573,10 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args, 
		return -ENOMEM;



	memset(&outarg, 0, sizeof(outarg));

	args->in.h.nodeid = get_node_id(dir);

	args->out.numargs = 1;

	args->out.args[0].size = sizeof(outarg);

	args->out.args[0].value = &outarg;

	args->nodeid = get_node_id(dir);

	args->out_numargs = 1;

	args->out_args[0].size = sizeof(outarg);

	args->out_args[0].value = &outarg;

	err = fuse_simple_request(fc, args);

	if (err)

		goto out_put_forget_req;
@@ -582,12 +629,12 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode, 
	inarg.mode = mode;

	inarg.rdev = new_encode_dev(rdev);

	inarg.umask = current_umask();

	args.in.h.opcode = FUSE_MKNOD;

	args.in.numargs = 2;

	args.in.args[0].size = sizeof(inarg);

	args.in.args[0].value = &inarg;

	args.in.args[1].size = entry->d_name.len + 1;

	args.in.args[1].value = entry->d_name.name;

	args.opcode = FUSE_MKNOD;

	args.in_numargs = 2;

	args.in_args[0].size = sizeof(inarg);

	args.in_args[0].value = &inarg;

	args.in_args[1].size = entry->d_name.len + 1;

	args.in_args[1].value = entry->d_name.name;

	return create_new_entry(fc, &args, dir, entry, mode);

}
@@ -609,12 +656,12 @@ static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode) 
	memset(&inarg, 0, sizeof(inarg));

	inarg.mode = mode;

	inarg.umask = current_umask();

	args.in.h.opcode = FUSE_MKDIR;

	args.in.numargs = 2;

	args.in.args[0].size = sizeof(inarg);

	args.in.args[0].value = &inarg;

	args.in.args[1].size = entry->d_name.len + 1;

	args.in.args[1].value = entry->d_name.name;

	args.opcode = FUSE_MKDIR;

	args.in_numargs = 2;

	args.in_args[0].size = sizeof(inarg);

	args.in_args[0].value = &inarg;

	args.in_args[1].size = entry->d_name.len + 1;

	args.in_args[1].value = entry->d_name.name;

	return create_new_entry(fc, &args, dir, entry, S_IFDIR);

}
@@ -625,12 +672,12 @@ static int fuse_symlink(struct inode *dir, struct dentry *entry, 
	unsigned len = strlen(link) + 1;

	FUSE_ARGS(args);



	args.in.h.opcode = FUSE_SYMLINK;

	args.in.numargs = 2;

	args.in.args[0].size = entry->d_name.len + 1;

	args.in.args[0].value = entry->d_name.name;

	args.in.args[1].size = len;

	args.in.args[1].value = link;

	args.opcode = FUSE_SYMLINK;

	args.in_numargs = 2;

	args.in_args[0].size = entry->d_name.len + 1;

	args.in_args[0].value = entry->d_name.name;

	args.in_args[1].size = len;

	args.in_args[1].value = link;

	return create_new_entry(fc, &args, dir, entry, S_IFLNK);

}
@@ -648,11 +695,11 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry) 
	struct fuse_conn *fc = get_fuse_conn(dir);

	FUSE_ARGS(args);



	args.in.h.opcode = FUSE_UNLINK;

	args.in.h.nodeid = get_node_id(dir);

	args.in.numargs = 1;

	args.in.args[0].size = entry->d_name.len + 1;

	args.in.args[0].value = entry->d_name.name;

	args.opcode = FUSE_UNLINK;

	args.nodeid = get_node_id(dir);

	args.in_numargs = 1;

	args.in_args[0].size = entry->d_name.len + 1;

	args.in_args[0].value = entry->d_name.name;

	err = fuse_simple_request(fc, &args);

	if (!err) {

		struct inode *inode = d_inode(entry);
@@ -684,11 +731,11 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry) 
	struct fuse_conn *fc = get_fuse_conn(dir);

	FUSE_ARGS(args);



	args.in.h.opcode = FUSE_RMDIR;

	args.in.h.nodeid = get_node_id(dir);

	args.in.numargs = 1;

	args.in.args[0].size = entry->d_name.len + 1;

	args.in.args[0].value = entry->d_name.name;

	args.opcode = FUSE_RMDIR;

	args.nodeid = get_node_id(dir);

	args.in_numargs = 1;

	args.in_args[0].size = entry->d_name.len + 1;

	args.in_args[0].value = entry->d_name.name;

	err = fuse_simple_request(fc, &args);

	if (!err) {

		clear_nlink(d_inode(entry));
@@ -711,15 +758,15 @@ static int fuse_rename_common(struct inode *olddir, struct dentry *oldent, 
	memset(&inarg, 0, argsize);

	inarg.newdir = get_node_id(newdir);

	inarg.flags = flags;

	args.in.h.opcode = opcode;

	args.in.h.nodeid = get_node_id(olddir);

	args.in.numargs = 3;

	args.in.args[0].size = argsize;

	args.in.args[0].value = &inarg;

	args.in.args[1].size = oldent->d_name.len + 1;

	args.in.args[1].value = oldent->d_name.name;

	args.in.args[2].size = newent->d_name.len + 1;

	args.in.args[2].value = newent->d_name.name;

	args.opcode = opcode;

	args.nodeid = get_node_id(olddir);

	args.in_numargs = 3;

	args.in_args[0].size = argsize;

	args.in_args[0].value = &inarg;

	args.in_args[1].size = oldent->d_name.len + 1;

	args.in_args[1].value = oldent->d_name.name;

	args.in_args[2].size = newent->d_name.len + 1;

	args.in_args[2].value = newent->d_name.name;

	err = fuse_simple_request(fc, &args);

	if (!err) {

		/* ctime changes */
@@ -796,12 +843,12 @@ static int fuse_link(struct dentry *entry, struct inode *newdir, 


	memset(&inarg, 0, sizeof(inarg));

	inarg.oldnodeid = get_node_id(inode);

	args.in.h.opcode = FUSE_LINK;

	args.in.numargs = 2;

	args.in.args[0].size = sizeof(inarg);

	args.in.args[0].value = &inarg;

	args.in.args[1].size = newent->d_name.len + 1;

	args.in.args[1].value = newent->d_name.name;

	args.opcode = FUSE_LINK;

	args.in_numargs = 2;

	args.in_args[0].size = sizeof(inarg);

	args.in_args[0].value = &inarg;

	args.in_args[1].size = newent->d_name.len + 1;

	args.in_args[1].value = newent->d_name.name;

	err = create_new_entry(fc, &args, newdir, newent, inode->i_mode);

	/* Contrary to "normal" filesystems it can happen that link

	   makes two "logical" inodes point to the same "physical"
@@ -884,14 +931,14 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat, 
		inarg.getattr_flags |= FUSE_GETATTR_FH;

		inarg.fh = ff->fh;

	}

	args.in.h.opcode = FUSE_GETATTR;

	args.in.h.nodeid = get_node_id(inode);

	args.in.numargs = 1;

	args.in.args[0].size = sizeof(inarg);

	args.in.args[0].value = &inarg;

	args.out.numargs = 1;

	args.out.args[0].size = sizeof(outarg);

	args.out.args[0].value = &outarg;

	args.opcode = FUSE_GETATTR;

	args.nodeid = get_node_id(inode);

	args.in_numargs = 1;

	args.in_args[0].size = sizeof(inarg);

	args.in_args[0].value = &inarg;

	args.out_numargs = 1;

	args.out_args[0].size = sizeof(outarg);

	args.out_args[0].value = &outarg;

	err = fuse_simple_request(fc, &args);

	if (!err) {

		if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
@@ -1056,11 +1103,11 @@ static int fuse_access(struct inode *inode, int mask) 


	memset(&inarg, 0, sizeof(inarg));

	inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);

	args.in.h.opcode = FUSE_ACCESS;

	args.in.h.nodeid = get_node_id(inode);

	args.in.numargs = 1;

	args.in.args[0].size = sizeof(inarg);

	args.in.args[0].value = &inarg;

	args.opcode = FUSE_ACCESS;

	args.nodeid = get_node_id(inode);

	args.in_numargs = 1;

	args.in_args[0].size = sizeof(inarg);

	args.in_args[0].value = &inarg;

	err = fuse_simple_request(fc, &args);

	if (err == -ENOSYS) {

		fc->no_access = 1;
@@ -1152,38 +1199,36 @@ static int fuse_permission(struct inode *inode, int mask) 
static int fuse_readlink_page(struct inode *inode, struct page *page)

{

	struct fuse_conn *fc = get_fuse_conn(inode);

	struct fuse_req *req;

	int err;

	struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 };

	struct fuse_args_pages ap = {

		.num_pages = 1,

		.pages = &page,

		.descs = &desc,

	};

	char *link;

	ssize_t res;



	ap.args.opcode = FUSE_READLINK;

	ap.args.nodeid = get_node_id(inode);

	ap.args.out_pages = true;

	ap.args.out_argvar = true;

	ap.args.page_zeroing = true;

	ap.args.out_numargs = 1;

	ap.args.out_args[0].size = desc.length;

	res = fuse_simple_request(fc, &ap.args);



	req = fuse_get_req(fc, 1);

	if (IS_ERR(req))

		return PTR_ERR(req);



	req->out.page_zeroing = 1;

	req->out.argpages = 1;

	req->num_pages = 1;

	req->pages[0] = page;

	req->page_descs[0].length = PAGE_SIZE - 1;

	req->in.h.opcode = FUSE_READLINK;

	req->in.h.nodeid = get_node_id(inode);

	req->out.argvar = 1;

	req->out.numargs = 1;

	req->out.args[0].size = PAGE_SIZE - 1;

	fuse_request_send(fc, req);

	err = req->out.h.error;

	fuse_invalidate_atime(inode);



	if (!err) {

		char *link = page_address(page);

		size_t len = req->out.args[0].size;

	if (res < 0)

		return res;



		BUG_ON(len >= PAGE_SIZE);

		link[len] = '\0';

	}

	if (WARN_ON(res >= PAGE_SIZE))

		return -EIO;



	fuse_put_request(fc, req);

	fuse_invalidate_atime(inode);

	link = page_address(page);

	link[res] = '\0';



	return err;

	return 0;

}



static const char *fuse_get_link(struct dentry *dentry, struct inode *inode,
@@ -1383,14 +1428,14 @@ static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args, 
			      struct fuse_setattr_in *inarg_p,

			      struct fuse_attr_out *outarg_p)

{

	args->in.h.opcode = FUSE_SETATTR;

	args->in.h.nodeid = get_node_id(inode);

	args->in.numargs = 1;

	args->in.args[0].size = sizeof(*inarg_p);

	args->in.args[0].value = inarg_p;

	args->out.numargs = 1;

	args->out.args[0].size = sizeof(*outarg_p);

	args->out.args[0].value = outarg_p;

	args->opcode = FUSE_SETATTR;

	args->nodeid = get_node_id(inode);

	args->in_numargs = 1;

	args->in_args[0].size = sizeof(*inarg_p);

	args->in_args[0].value = inarg_p;

	args->out_numargs = 1;

	args->out_args[0].size = sizeof(*outarg_p);

	args->out_args[0].value = outarg_p;

}



/*

fs/fuse/file.c

+669 −558

File changed.

Preview size limit exceeded, changes collapsed.