linux-kernel - [PATCH v3 01/21] fs: Add generic_atomic_write_valid

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Date: Mon, 29 Apr 2024 17:47:26 +0000
From: John Garry <john.g.garry@...cle.com>
To: david@...morbit.com, djwong@...nel.org, hch@....de,
        viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
        chandan.babu@...cle.com, willy@...radead.org
Cc: axboe@...nel.dk, martin.petersen@...cle.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, tytso@....edu, jbongio@...gle.com,
        ojaswin@...ux.ibm.com, ritesh.list@...il.com, mcgrof@...nel.org,
        p.raghav@...sung.com, linux-xfs@...r.kernel.org,
        catherine.hoang@...cle.com, John Garry <john.g.garry@...cle.com>
Subject: [PATCH v3 01/21] 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 6ebefb079740..9bfa9b68d800 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3648,4 +3648,16 @@ 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