diff mbox series

[10/12] fuse: update ki_pos in fuse_perform_write

Message ID 20230531075026.480237-11-hch@lst.de (mailing list archive)
State New
Headers show
Series [01/12] backing_dev: remove current->backing_dev_info | expand

Commit Message

Christoph Hellwig May 31, 2023, 7:50 a.m. UTC
Both callers of fuse_perform_write need to updated ki_pos, move it into
common code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
---
 fs/fuse/file.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

Comments

Miklos Szeredi May 31, 2023, 9:11 a.m. UTC | #1
On Wed, 31 May 2023 at 09:51, Christoph Hellwig <hch@lst.de> wrote:
>
> Both callers of fuse_perform_write need to updated ki_pos, move it into
> common code.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
> ---
>  fs/fuse/file.c | 23 ++++++++++-------------
>  1 file changed, 10 insertions(+), 13 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 97d435874b14aa..e60e48bf392d49 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -1329,7 +1329,10 @@ static ssize_t fuse_perform_write(struct kiocb *iocb,
>         fuse_write_update_attr(inode, pos, res);
>         clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
>
> -       return res > 0 ? res : err;
> +       if (!res)
> +               return err;
> +       iocb->ki_pos += res;
> +       return res;
>  }
>
>  static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
> @@ -1341,7 +1344,6 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>         struct inode *inode = mapping->host;
>         ssize_t err;
>         struct fuse_conn *fc = get_fuse_conn(inode);
> -       loff_t endbyte = 0;
>
>         if (fc->writeback_cache) {
>                 /* Update size (EOF optimization) and mode (SUID clearing) */
> @@ -1375,19 +1377,20 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>                 goto out;
>
>         if (iocb->ki_flags & IOCB_DIRECT) {
> -               loff_t pos = iocb->ki_pos;
> +               loff_t pos, endbyte;
> +
>                 written = generic_file_direct_write(iocb, from);
>                 if (written < 0 || !iov_iter_count(from))
>                         goto out;
>
> -               pos += written;
> -
> -               written_buffered = fuse_perform_write(iocb, mapping, from, pos);
> +               written_buffered = fuse_perform_write(iocb, mapping, from,
> +                                                     iocb->ki_pos);
>                 if (written_buffered < 0) {
>                         err = written_buffered;
>                         goto out;
>                 }
> -               endbyte = pos + written_buffered - 1;
> +               pos = iocb->ki_pos - written_buffered;
> +               endbyte = iocb->ki_pos - 1;
>
>                 err = filemap_write_and_wait_range(file->f_mapping, pos,
>                                                    endbyte);
> @@ -1399,17 +1402,11 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
>                                          endbyte >> PAGE_SHIFT);
>
>                 written += written_buffered;
> -               iocb->ki_pos = pos + written_buffered;
>         } else {
>                 written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos);
> -               if (written >= 0)
> -                       iocb->ki_pos += written;
>         }
>  out:
>         inode_unlock(inode);
> -       if (written > 0)
> -               written = generic_write_sync(iocb, written);

Why remove generic_write_sync()?  Definitely doesn't belong in this
patch even if there's a good reason.

Sorry, didn't notice this in the last round.

Thanks,
Miklos
diff mbox series

Patch

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 97d435874b14aa..e60e48bf392d49 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1329,7 +1329,10 @@  static ssize_t fuse_perform_write(struct kiocb *iocb,
 	fuse_write_update_attr(inode, pos, res);
 	clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
 
-	return res > 0 ? res : err;
+	if (!res)
+		return err;
+	iocb->ki_pos += res;
+	return res;
 }
 
 static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
@@ -1341,7 +1344,6 @@  static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	struct inode *inode = mapping->host;
 	ssize_t err;
 	struct fuse_conn *fc = get_fuse_conn(inode);
-	loff_t endbyte = 0;
 
 	if (fc->writeback_cache) {
 		/* Update size (EOF optimization) and mode (SUID clearing) */
@@ -1375,19 +1377,20 @@  static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 
 	if (iocb->ki_flags & IOCB_DIRECT) {
-		loff_t pos = iocb->ki_pos;
+		loff_t pos, endbyte;
+
 		written = generic_file_direct_write(iocb, from);
 		if (written < 0 || !iov_iter_count(from))
 			goto out;
 
-		pos += written;
-
-		written_buffered = fuse_perform_write(iocb, mapping, from, pos);
+		written_buffered = fuse_perform_write(iocb, mapping, from,
+						      iocb->ki_pos);
 		if (written_buffered < 0) {
 			err = written_buffered;
 			goto out;
 		}
-		endbyte = pos + written_buffered - 1;
+		pos = iocb->ki_pos - written_buffered;
+		endbyte = iocb->ki_pos - 1;
 
 		err = filemap_write_and_wait_range(file->f_mapping, pos,
 						   endbyte);
@@ -1399,17 +1402,11 @@  static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 					 endbyte >> PAGE_SHIFT);
 
 		written += written_buffered;
-		iocb->ki_pos = pos + written_buffered;
 	} else {
 		written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos);
-		if (written >= 0)
-			iocb->ki_pos += written;
 	}
 out:
 	inode_unlock(inode);
-	if (written > 0)
-		written = generic_write_sync(iocb, written);
-
 	return written ? written : err;
 }