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btrfs: return EXDEV when linking from different subvolumes 

btrfs_link returns EPERM if a cross-subvolume link is attempted.

However, in this case I believe EXDEV to be the more appropriate value.
>From the link(2) man page:

EXDEV  oldpath and newpath are not on the same mounted file system.  (Linux
       permits a file system to be mounted at multiple points, but link()
       does not work across different mount points, even if the same file
       system is mounted on both.)

This matters because an application may have different behaviors based on
return codes.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Mark Fasheh 2011-03-22 17:20:26 +00:00 committed by root
parent 75e7cb7fe0
commit 3ab3564f01
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/inode.c
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@ -4817,7 +4817,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
/* do not allow sys_link's with other subvols of the same device */
if (root->objectid != BTRFS_I(inode)->root->objectid)
return -EPERM;
return -EXDEV;
btrfs_inc_nlink(inode);
inode->i_ctime = CURRENT_TIME;