linux-kernel - [PATCH v3 4/7] fs: do not compare against ->llseek

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Date:   Wed, 29 Jun 2022 15:06:59 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH v3 4/7] fs: do not compare against ->llseek

Now we can rely on llseek being functional (via vfs_llseek) if
FMODE_LSEEK is set, so remove the old broken comparisons.

Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 fs/coredump.c          | 4 ++--
 fs/overlayfs/copy_up.c | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index ebc43f960b64..9f4aae202109 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -816,9 +816,9 @@ static int __dump_skip(struct coredump_params *cprm, size_t nr)
 {
 	static char zeroes[PAGE_SIZE];
 	struct file *file = cprm->file;
-	if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
+	if (file->f_mode & FMODE_LSEEK) {
 		if (dump_interrupted() ||
-		    file->f_op->llseek(file, nr, SEEK_CUR) < 0)
+		    vfs_llseek(file, nr, SEEK_CUR) < 0)
 			return 0;
 		cprm->pos += nr;
 		return 1;
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 714ec569d25b..022606c9703b 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -226,8 +226,7 @@ static int ovl_copy_up_data(struct ovl_fs *ofs, struct path *old,
 	/* Couldn't clone, so now we try to copy the data */
 
 	/* Check if lower fs supports seek operation */
-	if (old_file->f_mode & FMODE_LSEEK &&
-	    old_file->f_op->llseek)
+	if (old_file->f_mode & FMODE_LSEEK)
 		skip_hole = true;
 
 	while (len) {
-- 
2.35.1