Re: [PATCH 02/13] filemap: update ki_pos in generic_perform_write

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On 5/19/23 17:35, Christoph Hellwig wrote:
All callers of generic_perform_write need to updated ki_pos, move it into
common code.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
  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 d101b3b0c7dad8..50824831d31def 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 5ac53d2627d20d..9e3855e43a7a63 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4522,7 +4522,6 @@ 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 f0edf5a36237d1..3cc87ae8473356 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -658,7 +658,6 @@ 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 b4c9bd368b7e58..4d0ec2fa1c7070 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3957,7 +3957,10 @@ 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);
@@ -4036,7 +4039,6 @@ 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,
@@ -4049,8 +4051,6 @@ 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;

LGTM.

Reviewed-by: Xiubo Li <xiubli@xxxxxxxxxx>

Thanks

- Xiubo





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