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Message-ID: <20211231075750.GA1376@charmander>
Date: Fri, 31 Dec 2021 02:57:50 -0500
From: Tal Zussman <tz2294@...umbia.edu>
To: Alexander Viro <viro@...iv.linux.org.uk>,
"open list:FILESYSTEMS (VFS and infrastructure)"
<linux-fsdevel@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>, tz2294@...umbia.edu,
Xijiao Li <xl2950@...umbia.edu>,
Hans Montero <hjm2133@...umbia.edu>,
"Theodore Ts'o" <tytso@....edu>,
OS-TA <cucs4118-tas@...glegroups.com>
Subject: [PATCH] fs: Remove FIXME comment in generic_write_checks()
This patch removes an unnecessary comment that had to do with block special
files from `generic_write_checks()`.
The comment, originally added in Linux v2.4.14.9, was to clarify that we only
set `pos` to the file size when the file was opened with `O_APPEND` if the file
wasn't a block special file. Prior to Linux v2.4, block special files had a
different `write()` function which was unified into a generic `write()` function
in Linux v2.4. This generic `write()` function called `generic_write_checks()`.
For more details, see this earlier conversation:
https://lore.kernel.org/linux-fsdevel/Yc4Czk5A+p5p2Y4W@mit.edu/
Currently, block special devices have their own `write_iter()` function and no
longer share the same `generic_write_checks()`, therefore rendering the comment
irrelevant.
Signed-off-by: Tal Zussman <tz2294@...umbia.edu>
Co-authored-by: Xijiao Li <xl2950@...umbia.edu>
Co-authored-by: Hans Montero <hjm2133@...umbia.edu>
Suggested-by: Theodore Ts'o <tytso@....edu>
---
fs/read_write.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/fs/read_write.c b/fs/read_write.c
index 0074afa7ecb3..0173dc7183c9 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1637,7 +1637,6 @@ ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
if (!iov_iter_count(from))
return 0;
- /* FIXME: this is for backwards compatibility with 2.4 */
if (iocb->ki_flags & IOCB_APPEND)
iocb->ki_pos = i_size_read(inode);
--
2.20.1
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