diff mbox series

[f2fs-dev,05/17] filemap: update ki_pos in generic_perform_write

Message ID 20230424054926.26927-6-hch@lst.de (mailing list archive)
State New
Headers show
Series [f2fs-dev,01/17] fs: unexport buffer_check_dirty_writeback | expand

Commit Message

Christoph Hellwig April 24, 2023, 5:49 a.m. UTC 
All callers of generic_perform_write need to updated ki_pos, move it into
common code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/ceph/file.c | 2 --
 fs/ext4/file.c | 9 +++------
 fs/f2fs/file.c | 1 -
 fs/nfs/file.c  | 1 -
 mm/filemap.c   | 8 ++++----
 5 files changed, 7 insertions(+), 14 deletions(-)

Comments

Andreas Gruenbacher April 24, 2023, 6:54 p.m. UTC | #1 
On Mon, Apr 24, 2023 at 8:22 AM Christoph Hellwig <hch@lst.de> wrote:
> All callers of generic_perform_write need to updated ki_pos, move it into
> common code.

We've actually got a similar situation with
iomap_file_buffered_write() and its callers. Would it make sense to
fix that up as well?

> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  fs/ceph/file.c | 2 --
>  fs/ext4/file.c | 9 +++------
>  fs/f2fs/file.c | 1 -
>  fs/nfs/file.c  | 1 -
>  mm/filemap.c   | 8 ++++----
>  5 files changed, 7 insertions(+), 14 deletions(-)
>
> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
> index f4d8bf7dec88a8..feeb9882ef635a 100644
> --- a/fs/ceph/file.c
> +++ b/fs/ceph/file.c
> @@ -1894,8 +1894,6 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
>                  * can not run at the same time
>                  */
>                 written = generic_perform_write(iocb, from);
> -               if (likely(written >= 0))
> -                       iocb->ki_pos = pos + written;
>                 ceph_end_io_write(inode);
>         }
>
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index 0b8b4499e5ca18..1026acaf1235a0 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -291,12 +291,9 @@ static ssize_t ext4_buffered_write_iter(struct kiocb *iocb,
>
>  out:
>         inode_unlock(inode);
> -       if (likely(ret > 0)) {
> -               iocb->ki_pos += ret;
> -               ret = generic_write_sync(iocb, ret);
> -       }
> -
> -       return ret;
> +       if (unlikely(ret <= 0))
> +               return ret;
> +       return generic_write_sync(iocb, ret);
>  }
>
>  static ssize_t ext4_handle_inode_extension(struct inode *inode, loff_t offset,
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index f4ab23efcf85f8..5a9ae054b6da7d 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -4511,7 +4511,6 @@ static ssize_t f2fs_buffered_write_iter(struct kiocb *iocb,
>         current->backing_dev_info = NULL;
>
>         if (ret > 0) {
> -               iocb->ki_pos += ret;
>                 f2fs_update_iostat(F2FS_I_SB(inode), inode,
>                                                 APP_BUFFERED_IO, ret);
>         }
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c
> index 893625eacab9fa..abdae2b29369be 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -666,7 +666,6 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
>                 goto out;
>
>         written = result;
> -       iocb->ki_pos += written;
>         nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
>
>         if (mntflags & NFS_MOUNT_WRITE_EAGER) {
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 2723104cc06a12..0110bde3708b3f 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -3960,7 +3960,10 @@ ssize_t generic_perform_write(struct kiocb *iocb, struct iov_iter *i)
>                 balance_dirty_pages_ratelimited(mapping);
>         } while (iov_iter_count(i));
>
> -       return written ? written : status;
> +       if (!written)
> +               return status;
> +       iocb->ki_pos += written;

Could be turned into:
iocb->ki_pos = pos;

> +       return written;
>  }
>  EXPORT_SYMBOL(generic_perform_write);
>
> @@ -4039,7 +4042,6 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>                 endbyte = pos + status - 1;
>                 err = filemap_write_and_wait_range(mapping, pos, endbyte);
>                 if (err == 0) {
> -                       iocb->ki_pos = endbyte + 1;
>                         written += status;
>                         invalidate_mapping_pages(mapping,
>                                                  pos >> PAGE_SHIFT,
> @@ -4052,8 +4054,6 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>                 }
>         } else {
>                 written = generic_perform_write(iocb, from);
> -               if (likely(written > 0))
> -                       iocb->ki_pos += written;
>         }
>  out:
>         current->backing_dev_info = NULL;
> --
> 2.39.2
>

Thanks,
Andreas
diff mbox series

Patch

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index f4d8bf7dec88a8..feeb9882ef635a 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1894,8 +1894,6 @@  static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		 * can not run at the same time
 		 */
 		written = generic_perform_write(iocb, from);
-		if (likely(written >= 0))
-			iocb->ki_pos = pos + written;
 		ceph_end_io_write(inode);
 	}
 
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 0b8b4499e5ca18..1026acaf1235a0 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -291,12 +291,9 @@  static ssize_t ext4_buffered_write_iter(struct kiocb *iocb,
 
 out:
 	inode_unlock(inode);
-	if (likely(ret > 0)) {
-		iocb->ki_pos += ret;
-		ret = generic_write_sync(iocb, ret);
-	}
-
-	return ret;
+	if (unlikely(ret <= 0))
+		return ret;
+	return generic_write_sync(iocb, ret);
 }
 
 static ssize_t ext4_handle_inode_extension(struct inode *inode, loff_t offset,
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index f4ab23efcf85f8..5a9ae054b6da7d 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4511,7 +4511,6 @@  static ssize_t f2fs_buffered_write_iter(struct kiocb *iocb,
 	current->backing_dev_info = NULL;
 
 	if (ret > 0) {
-		iocb->ki_pos += ret;
 		f2fs_update_iostat(F2FS_I_SB(inode), inode,
 						APP_BUFFERED_IO, ret);
 	}
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 893625eacab9fa..abdae2b29369be 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -666,7 +666,6 @@  ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
 		goto out;
 
 	written = result;
-	iocb->ki_pos += written;
 	nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
 
 	if (mntflags & NFS_MOUNT_WRITE_EAGER) {
diff --git a/mm/filemap.c b/mm/filemap.c
index 2723104cc06a12..0110bde3708b3f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3960,7 +3960,10 @@  ssize_t generic_perform_write(struct kiocb *iocb, struct iov_iter *i)
 		balance_dirty_pages_ratelimited(mapping);
 	} while (iov_iter_count(i));
 
-	return written ? written : status;
+	if (!written)
+		return status;
+	iocb->ki_pos += written;
+	return written;
 }
 EXPORT_SYMBOL(generic_perform_write);
 
@@ -4039,7 +4042,6 @@  ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		endbyte = pos + status - 1;
 		err = filemap_write_and_wait_range(mapping, pos, endbyte);
 		if (err == 0) {
-			iocb->ki_pos = endbyte + 1;
 			written += status;
 			invalidate_mapping_pages(mapping,
 						 pos >> PAGE_SHIFT,
@@ -4052,8 +4054,6 @@  ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		}
 	} else {
 		written = generic_perform_write(iocb, from);
-		if (likely(written > 0))
-			iocb->ki_pos += written;
 	}
 out:
 	current->backing_dev_info = NULL;