Commit 5b9932f6 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

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: default avatarDarrick J. Wong <djwong@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 15f78aa3

fs/read_write.c

+1 −0
Original line number Diff line number Diff line
@@ -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)

fs/remap_range.c

+2 −2
Original line number Diff line number Diff line
@@ -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

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -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,