diff mbox series

[RESEND,V12,5/8] fuse: Introduce synchronous read and write for passthrough

Message ID 20210125153057.3623715-6-balsini@android.com (mailing list archive)
State New
Headers show
Series fuse: Add support for passthrough read/write | expand

Commit Message

Alessio Balsini Jan. 25, 2021, 3:30 p.m. UTC
All the read and write operations performed on fuse_files which have the
passthrough feature enabled are forwarded to the associated lower file
system file via VFS.

Sending the request directly to the lower file system avoids the
userspace round-trip that, because of possible context switches and
additional operations might reduce the overall performance, especially
in those cases where caching doesn't help, for example in reads at
random offsets.

Verifying if a fuse_file has a lower file system file associated with
can be done by checking the validity of its passthrough_filp pointer.
This pointer is not NULL only if passthrough has been successfully
enabled via the appropriate ioctl().
When a read/write operation is requested for a FUSE file with
passthrough enabled, a new equivalent VFS request is generated, which
instead targets the lower file system file.
The VFS layer performs additional checks that allow for safer operations
but may cause the operation to fail if the process accessing the FUSE
file system does not have access to the lower file system.

This change only implements synchronous requests in passthrough,
returning an error in the case of asynchronous operations, yet covering
the majority of the use cases.

Signed-off-by: Alessio Balsini <balsini@android.com>
---
 fs/fuse/file.c        |  8 ++++--
 fs/fuse/fuse_i.h      |  2 ++
 fs/fuse/passthrough.c | 57 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+), 2 deletions(-)

Comments

Miklos Szeredi Feb. 17, 2021, 2 p.m. UTC | #1
On Mon, Jan 25, 2021 at 4:31 PM Alessio Balsini <balsini@android.com> wrote:
>
> All the read and write operations performed on fuse_files which have the
> passthrough feature enabled are forwarded to the associated lower file
> system file via VFS.
>
> Sending the request directly to the lower file system avoids the
> userspace round-trip that, because of possible context switches and
> additional operations might reduce the overall performance, especially
> in those cases where caching doesn't help, for example in reads at
> random offsets.
>
> Verifying if a fuse_file has a lower file system file associated with
> can be done by checking the validity of its passthrough_filp pointer.
> This pointer is not NULL only if passthrough has been successfully
> enabled via the appropriate ioctl().
> When a read/write operation is requested for a FUSE file with
> passthrough enabled, a new equivalent VFS request is generated, which
> instead targets the lower file system file.
> The VFS layer performs additional checks that allow for safer operations
> but may cause the operation to fail if the process accessing the FUSE
> file system does not have access to the lower file system.
>
> This change only implements synchronous requests in passthrough,
> returning an error in the case of asynchronous operations, yet covering
> the majority of the use cases.
>
> Signed-off-by: Alessio Balsini <balsini@android.com>
> ---
>  fs/fuse/file.c        |  8 ++++--
>  fs/fuse/fuse_i.h      |  2 ++
>  fs/fuse/passthrough.c | 57 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 65 insertions(+), 2 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 953f3034c375..cddada1e8bd9 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1581,7 +1581,9 @@ static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
>         if (FUSE_IS_DAX(inode))
>                 return fuse_dax_read_iter(iocb, to);
>
> -       if (!(ff->open_flags & FOPEN_DIRECT_IO))
> +       if (ff->passthrough.filp)
> +               return fuse_passthrough_read_iter(iocb, to);
> +       else if (!(ff->open_flags & FOPEN_DIRECT_IO))
>                 return fuse_cache_read_iter(iocb, to);
>         else
>                 return fuse_direct_read_iter(iocb, to);
> @@ -1599,7 +1601,9 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>         if (FUSE_IS_DAX(inode))
>                 return fuse_dax_write_iter(iocb, from);
>
> -       if (!(ff->open_flags & FOPEN_DIRECT_IO))
> +       if (ff->passthrough.filp)
> +               return fuse_passthrough_write_iter(iocb, from);
> +       else if (!(ff->open_flags & FOPEN_DIRECT_IO))
>                 return fuse_cache_write_iter(iocb, from);
>         else
>                 return fuse_direct_write_iter(iocb, from);
> diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
> index 8d39f5304a11..c4730d893324 100644
> --- a/fs/fuse/fuse_i.h
> +++ b/fs/fuse/fuse_i.h
> @@ -1239,5 +1239,7 @@ int fuse_passthrough_open(struct fuse_dev *fud,
>  int fuse_passthrough_setup(struct fuse_conn *fc, struct fuse_file *ff,
>                            struct fuse_open_out *openarg);
>  void fuse_passthrough_release(struct fuse_passthrough *passthrough);
> +ssize_t fuse_passthrough_read_iter(struct kiocb *iocb, struct iov_iter *to);
> +ssize_t fuse_passthrough_write_iter(struct kiocb *iocb, struct iov_iter *from);
>
>  #endif /* _FS_FUSE_I_H */
> diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c
> index cf993e83803e..d949ca07a83b 100644
> --- a/fs/fuse/passthrough.c
> +++ b/fs/fuse/passthrough.c
> @@ -4,6 +4,63 @@
>
>  #include <linux/fuse.h>
>  #include <linux/idr.h>
> +#include <linux/uio.h>
> +
> +#define PASSTHROUGH_IOCB_MASK                                                  \
> +       (IOCB_APPEND | IOCB_DSYNC | IOCB_HIPRI | IOCB_NOWAIT | IOCB_SYNC)
> +
> +static void fuse_copyattr(struct file *dst_file, struct file *src_file)
> +{
> +       struct inode *dst = file_inode(dst_file);
> +       struct inode *src = file_inode(src_file);
> +
> +       i_size_write(dst, i_size_read(src));
> +}

Hmm, I see why this is done, yet it's contrary to what's been set out
at the beginning: "All the requests other than reads or writes are
still handled by the userspace FUSE daemon."

Maybe just use fuse_write_update_size() instead of copying the size
from the underlying inode.

> +
> +ssize_t fuse_passthrough_read_iter(struct kiocb *iocb_fuse,
> +                                  struct iov_iter *iter)
> +{
> +       ssize_t ret;
> +       struct file *fuse_filp = iocb_fuse->ki_filp;
> +       struct fuse_file *ff = fuse_filp->private_data;
> +       struct file *passthrough_filp = ff->passthrough.filp;
> +
> +       if (!iov_iter_count(iter))
> +               return 0;
> +
> +       ret = vfs_iter_read(passthrough_filp, iter, &iocb_fuse->ki_pos,
> +                           iocb_to_rw_flags(iocb_fuse->ki_flags,
> +                                            PASSTHROUGH_IOCB_MASK));

Please split this line up into:

rwf = ioctb_to_rw_flags(...);
ret = vfs_iter_read(..., rwf);

> +
> +       return ret;
> +}
> +
> +ssize_t fuse_passthrough_write_iter(struct kiocb *iocb_fuse,
> +                                   struct iov_iter *iter)
> +{
> +       ssize_t ret;
> +       struct file *fuse_filp = iocb_fuse->ki_filp;
> +       struct fuse_file *ff = fuse_filp->private_data;
> +       struct inode *fuse_inode = file_inode(fuse_filp);
> +       struct file *passthrough_filp = ff->passthrough.filp;
> +
> +       if (!iov_iter_count(iter))
> +               return 0;
> +
> +       inode_lock(fuse_inode);
> +
> +       file_start_write(passthrough_filp);
> +       ret = vfs_iter_write(passthrough_filp, iter, &iocb_fuse->ki_pos,
> +                            iocb_to_rw_flags(iocb_fuse->ki_flags,
> +                                             PASSTHROUGH_IOCB_MASK));

Same here.

Thanks,
Miklos
diff mbox series

Patch

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 953f3034c375..cddada1e8bd9 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1581,7 +1581,9 @@  static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 	if (FUSE_IS_DAX(inode))
 		return fuse_dax_read_iter(iocb, to);
 
-	if (!(ff->open_flags & FOPEN_DIRECT_IO))
+	if (ff->passthrough.filp)
+		return fuse_passthrough_read_iter(iocb, to);
+	else if (!(ff->open_flags & FOPEN_DIRECT_IO))
 		return fuse_cache_read_iter(iocb, to);
 	else
 		return fuse_direct_read_iter(iocb, to);
@@ -1599,7 +1601,9 @@  static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	if (FUSE_IS_DAX(inode))
 		return fuse_dax_write_iter(iocb, from);
 
-	if (!(ff->open_flags & FOPEN_DIRECT_IO))
+	if (ff->passthrough.filp)
+		return fuse_passthrough_write_iter(iocb, from);
+	else if (!(ff->open_flags & FOPEN_DIRECT_IO))
 		return fuse_cache_write_iter(iocb, from);
 	else
 		return fuse_direct_write_iter(iocb, from);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 8d39f5304a11..c4730d893324 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1239,5 +1239,7 @@  int fuse_passthrough_open(struct fuse_dev *fud,
 int fuse_passthrough_setup(struct fuse_conn *fc, struct fuse_file *ff,
 			   struct fuse_open_out *openarg);
 void fuse_passthrough_release(struct fuse_passthrough *passthrough);
+ssize_t fuse_passthrough_read_iter(struct kiocb *iocb, struct iov_iter *to);
+ssize_t fuse_passthrough_write_iter(struct kiocb *iocb, struct iov_iter *from);
 
 #endif /* _FS_FUSE_I_H */
diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c
index cf993e83803e..d949ca07a83b 100644
--- a/fs/fuse/passthrough.c
+++ b/fs/fuse/passthrough.c
@@ -4,6 +4,63 @@ 
 
 #include <linux/fuse.h>
 #include <linux/idr.h>
+#include <linux/uio.h>
+
+#define PASSTHROUGH_IOCB_MASK                                                  \
+	(IOCB_APPEND | IOCB_DSYNC | IOCB_HIPRI | IOCB_NOWAIT | IOCB_SYNC)
+
+static void fuse_copyattr(struct file *dst_file, struct file *src_file)
+{
+	struct inode *dst = file_inode(dst_file);
+	struct inode *src = file_inode(src_file);
+
+	i_size_write(dst, i_size_read(src));
+}
+
+ssize_t fuse_passthrough_read_iter(struct kiocb *iocb_fuse,
+				   struct iov_iter *iter)
+{
+	ssize_t ret;
+	struct file *fuse_filp = iocb_fuse->ki_filp;
+	struct fuse_file *ff = fuse_filp->private_data;
+	struct file *passthrough_filp = ff->passthrough.filp;
+
+	if (!iov_iter_count(iter))
+		return 0;
+
+	ret = vfs_iter_read(passthrough_filp, iter, &iocb_fuse->ki_pos,
+			    iocb_to_rw_flags(iocb_fuse->ki_flags,
+					     PASSTHROUGH_IOCB_MASK));
+
+	return ret;
+}
+
+ssize_t fuse_passthrough_write_iter(struct kiocb *iocb_fuse,
+				    struct iov_iter *iter)
+{
+	ssize_t ret;
+	struct file *fuse_filp = iocb_fuse->ki_filp;
+	struct fuse_file *ff = fuse_filp->private_data;
+	struct inode *fuse_inode = file_inode(fuse_filp);
+	struct file *passthrough_filp = ff->passthrough.filp;
+
+	if (!iov_iter_count(iter))
+		return 0;
+
+	inode_lock(fuse_inode);
+
+	file_start_write(passthrough_filp);
+	ret = vfs_iter_write(passthrough_filp, iter, &iocb_fuse->ki_pos,
+			     iocb_to_rw_flags(iocb_fuse->ki_flags,
+					      PASSTHROUGH_IOCB_MASK));
+	file_end_write(passthrough_filp);
+	if (ret > 0)
+		fuse_copyattr(fuse_filp, passthrough_filp);
+
+	inode_unlock(fuse_inode);
+
+	return ret;
+}
 
 int fuse_passthrough_open(struct fuse_dev *fud,
 			  struct fuse_passthrough_out *pto)