From 5b9932f6001c70b984e8c9c2fe09e443beb4baba Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <djwong@kernel.org>
Date: Mon, 15 Apr 2024 14:54:13 -0700
Subject: [PATCH] vfs: export remap and write check helpers
Export these functions so that the next patch can use them to check the
file ranges being passed to the XFS_IOC_EXCHANGE_RANGE operation.
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/read_write.c | 1 +
fs/remap_range.c | 4 ++--
include/linux/fs.h | 1 +
3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/read_write.c b/fs/read_write.c
index d4c036e82b6c3..85c096f2c0d06 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1667,6 +1667,7 @@ int generic_write_check_limits(struct file *file, loff_t pos, loff_t *count)
return 0;
}
+EXPORT_SYMBOL_GPL(generic_write_check_limits);
/* Like generic_write_checks(), but takes size of write instead of iter. */
int generic_write_checks_count(struct kiocb *iocb, loff_t *count)
diff --git a/fs/remap_range.c b/fs/remap_range.c
index de07f978ce3eb..28246dfc84851 100644
--- a/fs/remap_range.c
+++ b/fs/remap_range.c
@@ -99,8 +99,7 @@ static int generic_remap_checks(struct file *file_in, loff_t pos_in,
return 0;
}
-static int remap_verify_area(struct file *file, loff_t pos, loff_t len,
- bool write)
+int remap_verify_area(struct file *file, loff_t pos, loff_t len, bool write)
{
int mask = write ? MAY_WRITE : MAY_READ;
loff_t tmp;
@@ -118,6 +117,7 @@ static int remap_verify_area(struct file *file, loff_t pos, loff_t len,
return fsnotify_file_area_perm(file, mask, &pos, len);
}
+EXPORT_SYMBOL_GPL(remap_verify_area);
/*
* Ensure that we don't remap a partial EOF block in the middle of something
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8dfd53b52744a..0835faeebe7b3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2119,6 +2119,7 @@ extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
loff_t, size_t, unsigned int);
+int remap_verify_area(struct file *file, loff_t pos, loff_t len, bool write);
int __generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out,
loff_t *len, unsigned int remap_flags,
--
2.30.2