linux-kernel - [PATCH v4 01/22] fs: Add generic_atomic_write_valid

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Message-Id: <20240607143919.2622319-2-john.g.garry@oracle.com>
Date: Fri,  7 Jun 2024 14:38:58 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, tytso@....edu, dchinner@...hat.com,
        viro@...iv.linux.org.uk, brauner@...nel.org, djwong@...nel.org,
        jack@...e.com, chandan.babu@...cle.com, hch@....de
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, gfs2@...ts.linux.dev,
        linux-xfs@...r.kernel.org, catherine.hoang@...cle.com,
        ritesh.list@...il.com, mcgrof@...nel.org,
        mikulas@...ax.karlin.mff.cuni.cz, agruenba@...hat.com,
        miklos@...redi.hu, martin.petersen@...cle.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH v4 01/22] fs: Add generic_atomic_write_valid_size()

Add a generic helper for FSes to validate that an atomic write is
appropriately sized (along with the other checks).

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 include/linux/fs.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 069cbab62700..e13d34f8c24e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3645,4 +3645,16 @@ bool generic_atomic_write_valid(loff_t pos, struct iov_iter *iter)
 	return true;
 }
 
+static inline
+bool generic_atomic_write_valid_size(loff_t pos, struct iov_iter *iter,
+				unsigned int unit_min, unsigned int unit_max)
+{
+	size_t len = iov_iter_count(iter);
+
+	if (len < unit_min || len > unit_max)
+		return false;
+
+	return generic_atomic_write_valid(pos, iter);
+}
+
 #endif /* _LINUX_FS_H */
-- 
2.31.1