linux-kernel - [PATCH v8 1/7] block/fs: Pass an iocb to generic_atomic_write

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Message-Id: <20241015090142.3189518-2-john.g.garry@oracle.com>
Date: Tue, 15 Oct 2024 09:01:36 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, brauner@...nel.org, djwong@...nel.org,
        viro@...iv.linux.org.uk, jack@...e.cz, dchinner@...hat.com, hch@....de,
        cem@...nel.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, hare@...e.de,
        martin.petersen@...cle.com, catherine.hoang@...cle.com,
        mcgrof@...nel.org, ritesh.list@...il.com, ojaswin@...ux.ibm.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH v8 1/7] block/fs: Pass an iocb to generic_atomic_write_valid()

Darrick and Hannes both thought it better that generic_atomic_write_valid()
should be passed a struct iocb, and not just the member of that struct
which is referenced; see [0] and [1].

I think that makes a more generic and clean API, so make that change.

[0] https://lore.kernel.org/linux-block/680ce641-729b-4150-b875-531a98657682@suse.de/
[1] https://lore.kernel.org/linux-xfs/20240620212401.GA3058325@frogsfrogsfrogs/

Fixes: c34fc6f26ab8 ("fs: Initial atomic write support")
Suggested-by: "Darrick J. Wong" <djwong@...nel.org>
Suggested-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: "Darrick J. Wong" <djwong@...nel.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 block/fops.c       | 8 ++++----
 fs/read_write.c    | 4 ++--
 include/linux/fs.h | 2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/block/fops.c b/block/fops.c
index e696ae53bf1e..968b47b615c4 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -35,13 +35,13 @@ static blk_opf_t dio_bio_write_op(struct kiocb *iocb)
 	return opf;
 }
 
-static bool blkdev_dio_invalid(struct block_device *bdev, loff_t pos,
+static bool blkdev_dio_invalid(struct block_device *bdev, struct kiocb *iocb,
 				struct iov_iter *iter, bool is_atomic)
 {
-	if (is_atomic && !generic_atomic_write_valid(iter, pos))
+	if (is_atomic && !generic_atomic_write_valid(iocb, iter))
 		return true;
 
-	return pos & (bdev_logical_block_size(bdev) - 1) ||
+	return iocb->ki_pos & (bdev_logical_block_size(bdev) - 1) ||
 		!bdev_iter_is_aligned(bdev, iter);
 }
 
@@ -374,7 +374,7 @@ static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 	if (!iov_iter_count(iter))
 		return 0;
 
-	if (blkdev_dio_invalid(bdev, iocb->ki_pos, iter, is_atomic))
+	if (blkdev_dio_invalid(bdev, iocb, iter, is_atomic))
 		return -EINVAL;
 
 	nr_pages = bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS + 1);
diff --git a/fs/read_write.c b/fs/read_write.c
index 64dc24afdb3a..2c3263530828 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1830,7 +1830,7 @@ int generic_file_rw_checks(struct file *file_in, struct file *file_out)
 	return 0;
 }
 
-bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos)
+bool generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter)
 {
 	size_t len = iov_iter_count(iter);
 
@@ -1840,7 +1840,7 @@ bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos)
 	if (!is_power_of_2(len))
 		return false;
 
-	if (!IS_ALIGNED(pos, len))
+	if (!IS_ALIGNED(iocb->ki_pos, len))
 		return false;
 
 	return true;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e3c603d01337..fbfa032d1d90 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3721,6 +3721,6 @@ static inline bool vfs_empty_path(int dfd, const char __user *path)
 	return !c;
 }
 
-bool generic_atomic_write_valid(struct iov_iter *iter, loff_t pos);
+bool generic_atomic_write_valid(struct kiocb *iocb, struct iov_iter *iter);
 
 #endif /* _LINUX_FS_H */
-- 
2.31.1