[PATCH 6.1 3/8] filemap: update ki_pos in generic_perform_write

[Mahmoud Adam <mngyadam@amazon.de>]

From: Christoph Hellwig <hch@lst.de>

commit 182c25e9c157f37bd0ab5a82fe2417e2223df459 upstream.

All callers of generic_perform_write need to updated ki_pos, move it into
common code.

Link: https://lkml.kernel.org/r/20230601145904.1385409-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Anna Schumaker <anna@kernel.org>
Cc: Chao Yu <chao@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mahmoud Adam <mngyadam@amazon.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 3336647e64df3a..5921bf278fff72 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1891,8 +1891,6 @@ 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 289b088f4ae58f..e84a144f3f8ed5 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -287,12 +287,9 @@ 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 5e2a0cb8d24d92..09b85d086d16a6 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4661,7 +4661,6 @@ 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 d8ec889a4b3f76..c1be636ef25729 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -645,7 +645,6 @@ 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 39484af4300e3c..e2045266d2f2c9 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3891,7 +3891,10 @@ 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);
 
@@ -3970,7 +3973,6 @@ 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,
@@ -3983,8 +3985,6 @@ 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;
-- 
2.47.3




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