linux-kernel - [PATCH] fs: clean up after mandatory file locking support removal

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Date:   Tue, 24 Aug 2021 13:12:59 +0200
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Jeff Layton <jlayton@...nel.org>, linux-fsdevel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH] fs: clean up after mandatory file locking support removal

Commit 3efee0567b4a ("fs: remove mandatory file locking support") removes
some operations in functions rw_verify_area() and remap_verify_area().

As these functions are now simplified, do some syntactic clean-up as
follow-up to the removal as well, which was pointed out by compiler
warnings and static analysis.

No functional change.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
---
Jeff, please pick this clean-up patch on top of the commit above.

 fs/read_write.c  | 10 +++-------
 fs/remap_range.c |  2 --
 2 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index ffe821b8588e..af057c57bdc6 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -365,12 +365,8 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
 
 int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count)
 {
-	struct inode *inode;
-	int retval = -EINVAL;
-
-	inode = file_inode(file);
 	if (unlikely((ssize_t) count < 0))
-		return retval;
+		return -EINVAL;
 
 	/*
 	 * ranged mandatory locking does not apply to streams - it makes sense
@@ -381,12 +377,12 @@ int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t
 
 		if (unlikely(pos < 0)) {
 			if (!unsigned_offsets(file))
-				return retval;
+				return -EINVAL;
 			if (count >= -pos) /* both values are in 0..LLONG_MAX */
 				return -EOVERFLOW;
 		} else if (unlikely((loff_t) (pos + count) < 0)) {
 			if (!unsigned_offsets(file))
-				return retval;
+				return -EINVAL;
 		}
 	}
 
diff --git a/fs/remap_range.c b/fs/remap_range.c
index ec6d26c526b3..6d4a9beaa097 100644
--- a/fs/remap_range.c
+++ b/fs/remap_range.c
@@ -99,8 +99,6 @@ static int generic_remap_checks(struct file *file_in, loff_t pos_in,
 static int remap_verify_area(struct file *file, loff_t pos, loff_t len,
 			     bool write)
 {
-	struct inode *inode = file_inode(file);
-
 	if (unlikely(pos < 0 || len < 0))
 		return -EINVAL;
 
-- 
2.26.2