Next patch will expand ioctl code and fuse/file.c is large enough as it is.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
obj-$(CONFIG_CUSE) += cuse.o
obj-$(CONFIG_VIRTIO_FS) += virtiofs.o
-fuse-y := dev.o dir.o file.o inode.o control.o xattr.o acl.o readdir.o
+fuse-y := dev.o dir.o file.o inode.o control.o xattr.o acl.o readdir.o ioctl.o
fuse-$(CONFIG_FUSE_DAX) += dax.o
virtiofs-y := virtio_fs.o
#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/module.h>
-#include <linux/compat.h>
#include <linux/swap.h>
#include <linux/falloc.h>
#include <linux/uio.h>
#include <linux/fs.h>
-static struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags,
- struct fuse_page_desc **desc)
-{
- struct page **pages;
-
- pages = kzalloc(npages * (sizeof(struct page *) +
- sizeof(struct fuse_page_desc)), flags);
- *desc = (void *) (pages + npages);
-
- return pages;
-}
-
static int fuse_send_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
int opcode, struct fuse_open_out *outargp)
{
return written ? written : err;
}
-static inline void fuse_page_descs_length_init(struct fuse_page_desc *descs,
- unsigned int index,
- unsigned int nr_pages)
-{
- int i;
-
- for (i = index; i < index + nr_pages; i++)
- descs[i].length = PAGE_SIZE - descs[i].offset;
-}
-
static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii)
{
return (unsigned long)ii->iov->iov_base + ii->iov_offset;
return retval;
}
-/*
- * CUSE servers compiled on 32bit broke on 64bit kernels because the
- * ABI was defined to be 'struct iovec' which is different on 32bit
- * and 64bit. Fortunately we can determine which structure the server
- * used from the size of the reply.
- */
-static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src,
- size_t transferred, unsigned count,
- bool is_compat)
-{
-#ifdef CONFIG_COMPAT
- if (count * sizeof(struct compat_iovec) == transferred) {
- struct compat_iovec *ciov = src;
- unsigned i;
-
- /*
- * With this interface a 32bit server cannot support
- * non-compat (i.e. ones coming from 64bit apps) ioctl
- * requests
- */
- if (!is_compat)
- return -EINVAL;
-
- for (i = 0; i < count; i++) {
- dst[i].iov_base = compat_ptr(ciov[i].iov_base);
- dst[i].iov_len = ciov[i].iov_len;
- }
- return 0;
- }
-#endif
-
- if (count * sizeof(struct iovec) != transferred)
- return -EIO;
-
- memcpy(dst, src, transferred);
- return 0;
-}
-
-/* Make sure iov_length() won't overflow */
-static int fuse_verify_ioctl_iov(struct fuse_conn *fc, struct iovec *iov,
- size_t count)
-{
- size_t n;
- u32 max = fc->max_pages << PAGE_SHIFT;
-
- for (n = 0; n < count; n++, iov++) {
- if (iov->iov_len > (size_t) max)
- return -ENOMEM;
- max -= iov->iov_len;
- }
- return 0;
-}
-
-static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst,
- void *src, size_t transferred, unsigned count,
- bool is_compat)
-{
- unsigned i;
- struct fuse_ioctl_iovec *fiov = src;
-
- if (fc->minor < 16) {
- return fuse_copy_ioctl_iovec_old(dst, src, transferred,
- count, is_compat);
- }
-
- if (count * sizeof(struct fuse_ioctl_iovec) != transferred)
- return -EIO;
-
- for (i = 0; i < count; i++) {
- /* Did the server supply an inappropriate value? */
- if (fiov[i].base != (unsigned long) fiov[i].base ||
- fiov[i].len != (unsigned long) fiov[i].len)
- return -EIO;
-
- dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base;
- dst[i].iov_len = (size_t) fiov[i].len;
-
-#ifdef CONFIG_COMPAT
- if (is_compat &&
- (ptr_to_compat(dst[i].iov_base) != fiov[i].base ||
- (compat_size_t) dst[i].iov_len != fiov[i].len))
- return -EIO;
-#endif
- }
-
- return 0;
-}
-
-
-/*
- * For ioctls, there is no generic way to determine how much memory
- * needs to be read and/or written. Furthermore, ioctls are allowed
- * to dereference the passed pointer, so the parameter requires deep
- * copying but FUSE has no idea whatsoever about what to copy in or
- * out.
- *
- * This is solved by allowing FUSE server to retry ioctl with
- * necessary in/out iovecs. Let's assume the ioctl implementation
- * needs to read in the following structure.
- *
- * struct a {
- * char *buf;
- * size_t buflen;
- * }
- *
- * On the first callout to FUSE server, inarg->in_size and
- * inarg->out_size will be NULL; then, the server completes the ioctl
- * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and
- * the actual iov array to
- *
- * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } }
- *
- * which tells FUSE to copy in the requested area and retry the ioctl.
- * On the second round, the server has access to the structure and
- * from that it can tell what to look for next, so on the invocation,
- * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to
- *
- * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) },
- * { .iov_base = a.buf, .iov_len = a.buflen } }
- *
- * FUSE will copy both struct a and the pointed buffer from the
- * process doing the ioctl and retry ioctl with both struct a and the
- * buffer.
- *
- * This time, FUSE server has everything it needs and completes ioctl
- * without FUSE_IOCTL_RETRY which finishes the ioctl call.
- *
- * Copying data out works the same way.
- *
- * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel
- * automatically initializes in and out iovs by decoding @cmd with
- * _IOC_* macros and the server is not allowed to request RETRY. This
- * limits ioctl data transfers to well-formed ioctls and is the forced
- * behavior for all FUSE servers.
- */
-long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
- unsigned int flags)
-{
- struct fuse_file *ff = file->private_data;
- struct fuse_mount *fm = ff->fm;
- struct fuse_ioctl_in inarg = {
- .fh = ff->fh,
- .cmd = cmd,
- .arg = arg,
- .flags = flags
- };
- struct fuse_ioctl_out outarg;
- struct iovec *iov_page = NULL;
- struct iovec *in_iov = NULL, *out_iov = NULL;
- unsigned int in_iovs = 0, out_iovs = 0, max_pages;
- size_t in_size, out_size, c;
- ssize_t transferred;
- int err, i;
- struct iov_iter ii;
- struct fuse_args_pages ap = {};
-
-#if BITS_PER_LONG == 32
- inarg.flags |= FUSE_IOCTL_32BIT;
-#else
- if (flags & FUSE_IOCTL_COMPAT) {
- inarg.flags |= FUSE_IOCTL_32BIT;
-#ifdef CONFIG_X86_X32
- if (in_x32_syscall())
- inarg.flags |= FUSE_IOCTL_COMPAT_X32;
-#endif
- }
-#endif
-
- /* assume all the iovs returned by client always fits in a page */
- BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
-
- err = -ENOMEM;
- ap.pages = fuse_pages_alloc(fm->fc->max_pages, GFP_KERNEL, &ap.descs);
- iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
- if (!ap.pages || !iov_page)
- goto out;
-
- fuse_page_descs_length_init(ap.descs, 0, fm->fc->max_pages);
-
- /*
- * If restricted, initialize IO parameters as encoded in @cmd.
- * RETRY from server is not allowed.
- */
- if (!(flags & FUSE_IOCTL_UNRESTRICTED)) {
- struct iovec *iov = iov_page;
-
- iov->iov_base = (void __user *)arg;
-
- switch (cmd) {
- case FS_IOC_GETFLAGS:
- case FS_IOC_SETFLAGS:
- iov->iov_len = sizeof(int);
- break;
- default:
- iov->iov_len = _IOC_SIZE(cmd);
- break;
- }
-
- if (_IOC_DIR(cmd) & _IOC_WRITE) {
- in_iov = iov;
- in_iovs = 1;
- }
-
- if (_IOC_DIR(cmd) & _IOC_READ) {
- out_iov = iov;
- out_iovs = 1;
- }
- }
-
- retry:
- inarg.in_size = in_size = iov_length(in_iov, in_iovs);
- inarg.out_size = out_size = iov_length(out_iov, out_iovs);
-
- /*
- * Out data can be used either for actual out data or iovs,
- * make sure there always is at least one page.
- */
- out_size = max_t(size_t, out_size, PAGE_SIZE);
- max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE);
-
- /* make sure there are enough buffer pages and init request with them */
- err = -ENOMEM;
- if (max_pages > fm->fc->max_pages)
- goto out;
- while (ap.num_pages < max_pages) {
- ap.pages[ap.num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
- if (!ap.pages[ap.num_pages])
- goto out;
- ap.num_pages++;
- }
-
-
- /* okay, let's send it to the client */
- ap.args.opcode = FUSE_IOCTL;
- ap.args.nodeid = ff->nodeid;
- ap.args.in_numargs = 1;
- ap.args.in_args[0].size = sizeof(inarg);
- ap.args.in_args[0].value = &inarg;
- if (in_size) {
- ap.args.in_numargs++;
- ap.args.in_args[1].size = in_size;
- ap.args.in_pages = true;
-
- err = -EFAULT;
- iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size);
- for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
- c = copy_page_from_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
- if (c != PAGE_SIZE && iov_iter_count(&ii))
- goto out;
- }
- }
-
- ap.args.out_numargs = 2;
- ap.args.out_args[0].size = sizeof(outarg);
- ap.args.out_args[0].value = &outarg;
- ap.args.out_args[1].size = out_size;
- ap.args.out_pages = true;
- ap.args.out_argvar = true;
-
- transferred = fuse_simple_request(fm, &ap.args);
- err = transferred;
- if (transferred < 0)
- goto out;
-
- /* did it ask for retry? */
- if (outarg.flags & FUSE_IOCTL_RETRY) {
- void *vaddr;
-
- /* no retry if in restricted mode */
- err = -EIO;
- if (!(flags & FUSE_IOCTL_UNRESTRICTED))
- goto out;
-
- in_iovs = outarg.in_iovs;
- out_iovs = outarg.out_iovs;
-
- /*
- * Make sure things are in boundary, separate checks
- * are to protect against overflow.
- */
- err = -ENOMEM;
- if (in_iovs > FUSE_IOCTL_MAX_IOV ||
- out_iovs > FUSE_IOCTL_MAX_IOV ||
- in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV)
- goto out;
-
- vaddr = kmap_atomic(ap.pages[0]);
- err = fuse_copy_ioctl_iovec(fm->fc, iov_page, vaddr,
- transferred, in_iovs + out_iovs,
- (flags & FUSE_IOCTL_COMPAT) != 0);
- kunmap_atomic(vaddr);
- if (err)
- goto out;
-
- in_iov = iov_page;
- out_iov = in_iov + in_iovs;
-
- err = fuse_verify_ioctl_iov(fm->fc, in_iov, in_iovs);
- if (err)
- goto out;
-
- err = fuse_verify_ioctl_iov(fm->fc, out_iov, out_iovs);
- if (err)
- goto out;
-
- goto retry;
- }
-
- err = -EIO;
- if (transferred > inarg.out_size)
- goto out;
-
- err = -EFAULT;
- iov_iter_init(&ii, READ, out_iov, out_iovs, transferred);
- for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
- c = copy_page_to_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
- if (c != PAGE_SIZE && iov_iter_count(&ii))
- goto out;
- }
- err = 0;
- out:
- free_page((unsigned long) iov_page);
- while (ap.num_pages)
- __free_page(ap.pages[--ap.num_pages]);
- kfree(ap.pages);
-
- return err ? err : outarg.result;
-}
-EXPORT_SYMBOL_GPL(fuse_do_ioctl);
-
-long fuse_ioctl_common(struct file *file, unsigned int cmd,
- unsigned long arg, unsigned int flags)
-{
- struct inode *inode = file_inode(file);
- struct fuse_conn *fc = get_fuse_conn(inode);
-
- if (!fuse_allow_current_process(fc))
- return -EACCES;
-
- if (fuse_is_bad(inode))
- return -EIO;
-
- return fuse_do_ioctl(file, cmd, arg, flags);
-}
-
-static long fuse_file_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- return fuse_ioctl_common(file, cmd, arg, 0);
-}
-
-static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
-}
-
/*
* All files which have been polled are linked to RB tree
* fuse_conn->polled_files which is indexed by kh. Walk the tree and
return unlikely(test_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state));
}
+static inline struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags,
+ struct fuse_page_desc **desc)
+{
+ struct page **pages;
+
+ pages = kzalloc(npages * (sizeof(struct page *) +
+ sizeof(struct fuse_page_desc)), flags);
+ *desc = (void *) (pages + npages);
+
+ return pages;
+}
+
+static inline void fuse_page_descs_length_init(struct fuse_page_desc *descs,
+ unsigned int index,
+ unsigned int nr_pages)
+{
+ int i;
+
+ for (i = index; i < index + nr_pages; i++)
+ descs[i].length = PAGE_SIZE - descs[i].offset;
+}
+
/** Device operations */
extern const struct file_operations fuse_dev_operations;
bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
void fuse_dax_cancel_work(struct fuse_conn *fc);
+/* ioctl.c */
+long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+
#endif /* _FS_FUSE_I_H */
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 Red Hat, Inc.
+ */
+
+#include "fuse_i.h"
+
+#include <linux/uio.h>
+#include <linux/compat.h>
+#include <linux/fileattr.h>
+
+/*
+ * CUSE servers compiled on 32bit broke on 64bit kernels because the
+ * ABI was defined to be 'struct iovec' which is different on 32bit
+ * and 64bit. Fortunately we can determine which structure the server
+ * used from the size of the reply.
+ */
+static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src,
+ size_t transferred, unsigned count,
+ bool is_compat)
+{
+#ifdef CONFIG_COMPAT
+ if (count * sizeof(struct compat_iovec) == transferred) {
+ struct compat_iovec *ciov = src;
+ unsigned i;
+
+ /*
+ * With this interface a 32bit server cannot support
+ * non-compat (i.e. ones coming from 64bit apps) ioctl
+ * requests
+ */
+ if (!is_compat)
+ return -EINVAL;
+
+ for (i = 0; i < count; i++) {
+ dst[i].iov_base = compat_ptr(ciov[i].iov_base);
+ dst[i].iov_len = ciov[i].iov_len;
+ }
+ return 0;
+ }
+#endif
+
+ if (count * sizeof(struct iovec) != transferred)
+ return -EIO;
+
+ memcpy(dst, src, transferred);
+ return 0;
+}
+
+/* Make sure iov_length() won't overflow */
+static int fuse_verify_ioctl_iov(struct fuse_conn *fc, struct iovec *iov,
+ size_t count)
+{
+ size_t n;
+ u32 max = fc->max_pages << PAGE_SHIFT;
+
+ for (n = 0; n < count; n++, iov++) {
+ if (iov->iov_len > (size_t) max)
+ return -ENOMEM;
+ max -= iov->iov_len;
+ }
+ return 0;
+}
+
+static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst,
+ void *src, size_t transferred, unsigned count,
+ bool is_compat)
+{
+ unsigned i;
+ struct fuse_ioctl_iovec *fiov = src;
+
+ if (fc->minor < 16) {
+ return fuse_copy_ioctl_iovec_old(dst, src, transferred,
+ count, is_compat);
+ }
+
+ if (count * sizeof(struct fuse_ioctl_iovec) != transferred)
+ return -EIO;
+
+ for (i = 0; i < count; i++) {
+ /* Did the server supply an inappropriate value? */
+ if (fiov[i].base != (unsigned long) fiov[i].base ||
+ fiov[i].len != (unsigned long) fiov[i].len)
+ return -EIO;
+
+ dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base;
+ dst[i].iov_len = (size_t) fiov[i].len;
+
+#ifdef CONFIG_COMPAT
+ if (is_compat &&
+ (ptr_to_compat(dst[i].iov_base) != fiov[i].base ||
+ (compat_size_t) dst[i].iov_len != fiov[i].len))
+ return -EIO;
+#endif
+ }
+
+ return 0;
+}
+
+
+/*
+ * For ioctls, there is no generic way to determine how much memory
+ * needs to be read and/or written. Furthermore, ioctls are allowed
+ * to dereference the passed pointer, so the parameter requires deep
+ * copying but FUSE has no idea whatsoever about what to copy in or
+ * out.
+ *
+ * This is solved by allowing FUSE server to retry ioctl with
+ * necessary in/out iovecs. Let's assume the ioctl implementation
+ * needs to read in the following structure.
+ *
+ * struct a {
+ * char *buf;
+ * size_t buflen;
+ * }
+ *
+ * On the first callout to FUSE server, inarg->in_size and
+ * inarg->out_size will be NULL; then, the server completes the ioctl
+ * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and
+ * the actual iov array to
+ *
+ * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } }
+ *
+ * which tells FUSE to copy in the requested area and retry the ioctl.
+ * On the second round, the server has access to the structure and
+ * from that it can tell what to look for next, so on the invocation,
+ * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to
+ *
+ * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) },
+ * { .iov_base = a.buf, .iov_len = a.buflen } }
+ *
+ * FUSE will copy both struct a and the pointed buffer from the
+ * process doing the ioctl and retry ioctl with both struct a and the
+ * buffer.
+ *
+ * This time, FUSE server has everything it needs and completes ioctl
+ * without FUSE_IOCTL_RETRY which finishes the ioctl call.
+ *
+ * Copying data out works the same way.
+ *
+ * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel
+ * automatically initializes in and out iovs by decoding @cmd with
+ * _IOC_* macros and the server is not allowed to request RETRY. This
+ * limits ioctl data transfers to well-formed ioctls and is the forced
+ * behavior for all FUSE servers.
+ */
+long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
+ unsigned int flags)
+{
+ struct fuse_file *ff = file->private_data;
+ struct fuse_mount *fm = ff->fm;
+ struct fuse_ioctl_in inarg = {
+ .fh = ff->fh,
+ .cmd = cmd,
+ .arg = arg,
+ .flags = flags
+ };
+ struct fuse_ioctl_out outarg;
+ struct iovec *iov_page = NULL;
+ struct iovec *in_iov = NULL, *out_iov = NULL;
+ unsigned int in_iovs = 0, out_iovs = 0, max_pages;
+ size_t in_size, out_size, c;
+ ssize_t transferred;
+ int err, i;
+ struct iov_iter ii;
+ struct fuse_args_pages ap = {};
+
+#if BITS_PER_LONG == 32
+ inarg.flags |= FUSE_IOCTL_32BIT;
+#else
+ if (flags & FUSE_IOCTL_COMPAT) {
+ inarg.flags |= FUSE_IOCTL_32BIT;
+#ifdef CONFIG_X86_X32
+ if (in_x32_syscall())
+ inarg.flags |= FUSE_IOCTL_COMPAT_X32;
+#endif
+ }
+#endif
+
+ /* assume all the iovs returned by client always fits in a page */
+ BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
+
+ err = -ENOMEM;
+ ap.pages = fuse_pages_alloc(fm->fc->max_pages, GFP_KERNEL, &ap.descs);
+ iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
+ if (!ap.pages || !iov_page)
+ goto out;
+
+ fuse_page_descs_length_init(ap.descs, 0, fm->fc->max_pages);
+
+ /*
+ * If restricted, initialize IO parameters as encoded in @cmd.
+ * RETRY from server is not allowed.
+ */
+ if (!(flags & FUSE_IOCTL_UNRESTRICTED)) {
+ struct iovec *iov = iov_page;
+
+ iov->iov_base = (void __user *)arg;
+
+ switch (cmd) {
+ case FS_IOC_GETFLAGS:
+ case FS_IOC_SETFLAGS:
+ iov->iov_len = sizeof(int);
+ break;
+ default:
+ iov->iov_len = _IOC_SIZE(cmd);
+ break;
+ }
+
+ if (_IOC_DIR(cmd) & _IOC_WRITE) {
+ in_iov = iov;
+ in_iovs = 1;
+ }
+
+ if (_IOC_DIR(cmd) & _IOC_READ) {
+ out_iov = iov;
+ out_iovs = 1;
+ }
+ }
+
+ retry:
+ inarg.in_size = in_size = iov_length(in_iov, in_iovs);
+ inarg.out_size = out_size = iov_length(out_iov, out_iovs);
+
+ /*
+ * Out data can be used either for actual out data or iovs,
+ * make sure there always is at least one page.
+ */
+ out_size = max_t(size_t, out_size, PAGE_SIZE);
+ max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE);
+
+ /* make sure there are enough buffer pages and init request with them */
+ err = -ENOMEM;
+ if (max_pages > fm->fc->max_pages)
+ goto out;
+ while (ap.num_pages < max_pages) {
+ ap.pages[ap.num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
+ if (!ap.pages[ap.num_pages])
+ goto out;
+ ap.num_pages++;
+ }
+
+
+ /* okay, let's send it to the client */
+ ap.args.opcode = FUSE_IOCTL;
+ ap.args.nodeid = ff->nodeid;
+ ap.args.in_numargs = 1;
+ ap.args.in_args[0].size = sizeof(inarg);
+ ap.args.in_args[0].value = &inarg;
+ if (in_size) {
+ ap.args.in_numargs++;
+ ap.args.in_args[1].size = in_size;
+ ap.args.in_pages = true;
+
+ err = -EFAULT;
+ iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size);
+ for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
+ c = copy_page_from_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
+ if (c != PAGE_SIZE && iov_iter_count(&ii))
+ goto out;
+ }
+ }
+
+ ap.args.out_numargs = 2;
+ ap.args.out_args[0].size = sizeof(outarg);
+ ap.args.out_args[0].value = &outarg;
+ ap.args.out_args[1].size = out_size;
+ ap.args.out_pages = true;
+ ap.args.out_argvar = true;
+
+ transferred = fuse_simple_request(fm, &ap.args);
+ err = transferred;
+ if (transferred < 0)
+ goto out;
+
+ /* did it ask for retry? */
+ if (outarg.flags & FUSE_IOCTL_RETRY) {
+ void *vaddr;
+
+ /* no retry if in restricted mode */
+ err = -EIO;
+ if (!(flags & FUSE_IOCTL_UNRESTRICTED))
+ goto out;
+
+ in_iovs = outarg.in_iovs;
+ out_iovs = outarg.out_iovs;
+
+ /*
+ * Make sure things are in boundary, separate checks
+ * are to protect against overflow.
+ */
+ err = -ENOMEM;
+ if (in_iovs > FUSE_IOCTL_MAX_IOV ||
+ out_iovs > FUSE_IOCTL_MAX_IOV ||
+ in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV)
+ goto out;
+
+ vaddr = kmap_atomic(ap.pages[0]);
+ err = fuse_copy_ioctl_iovec(fm->fc, iov_page, vaddr,
+ transferred, in_iovs + out_iovs,
+ (flags & FUSE_IOCTL_COMPAT) != 0);
+ kunmap_atomic(vaddr);
+ if (err)
+ goto out;
+
+ in_iov = iov_page;
+ out_iov = in_iov + in_iovs;
+
+ err = fuse_verify_ioctl_iov(fm->fc, in_iov, in_iovs);
+ if (err)
+ goto out;
+
+ err = fuse_verify_ioctl_iov(fm->fc, out_iov, out_iovs);
+ if (err)
+ goto out;
+
+ goto retry;
+ }
+
+ err = -EIO;
+ if (transferred > inarg.out_size)
+ goto out;
+
+ err = -EFAULT;
+ iov_iter_init(&ii, READ, out_iov, out_iovs, transferred);
+ for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) {
+ c = copy_page_to_iter(ap.pages[i], 0, PAGE_SIZE, &ii);
+ if (c != PAGE_SIZE && iov_iter_count(&ii))
+ goto out;
+ }
+ err = 0;
+ out:
+ free_page((unsigned long) iov_page);
+ while (ap.num_pages)
+ __free_page(ap.pages[--ap.num_pages]);
+ kfree(ap.pages);
+
+ return err ? err : outarg.result;
+}
+EXPORT_SYMBOL_GPL(fuse_do_ioctl);
+
+long fuse_ioctl_common(struct file *file, unsigned int cmd,
+ unsigned long arg, unsigned int flags)
+{
+ struct inode *inode = file_inode(file);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (!fuse_allow_current_process(fc))
+ return -EACCES;
+
+ if (fuse_is_bad(inode))
+ return -EIO;
+
+ return fuse_do_ioctl(file, cmd, arg, flags);
+}
+
+long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return fuse_ioctl_common(file, cmd, arg, 0);
+}
+
+long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
+}
projects / linux-2.6-microblaze.git / commitdiff