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fs: allow cross-vfsmount reflink/dedupe

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Currently we disallow reflink and dedupe if the two files aren't on the
same vfsmount.  However we really only need to disallow it if they're
not on the same super block.  It is very common for btrfs to have a main
subvolume that is mounted and then different subvolumes mounted at
different locations.  It's allowed to reflink between these volumes, but
the vfsmount check disallows this.  Instead fix dedupe to check for the
same superblock, and simply remove the vfsmount check for reflink as it
already does the superblock check.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-02-18 09:38:14 -05:00 committed by David Sterba
parent ae460f058e
commit 9f5710bbfd
2 changed files with 1 additions and 10 deletions
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4
fs/ioctl.c
View File

@ -236,9 +236,6 @@ static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
if (!src_file.file)
return -EBADF;
ret = -EXDEV;
if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
goto fdput;
cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff,
olen, 0);
if (cloned < 0)
@ -247,7 +244,6 @@ static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
ret = -EINVAL;
else
ret = 0;
fdput:
fdput(src_file);
return ret;
}

7
fs/remap_range.c
View File

@ -362,11 +362,6 @@ loff_t do_clone_file_range(struct file *file_in, loff_t pos_in,
WARN_ON_ONCE(remap_flags & REMAP_FILE_DEDUP);
/*
* FICLONE/FICLONERANGE ioctls enforce that src and dest files are on
* the same mount. Practically, they only need to be on the same file
* system.
*/
if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
return -EXDEV;
@ -458,7 +453,7 @@ loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
goto out_drop_write;
ret = -EXDEV;
if (src_file->f_path.mnt != dst_file->f_path.mnt)
if (file_inode(src_file)->i_sb != file_inode(dst_file)->i_sb)
goto out_drop_write;
ret = -EISDIR;