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fs: make remaining filesystems use .rename2

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This is trivial to do:

 - add flags argument to foo_rename()
 - check if flags is zero
 - assign foo_rename() to .rename2 instead of .rename

This doesn't mean it's impossible to support RENAME_NOREPLACE for these
filesystems, but it is not trivial, like for local filesystems.
RENAME_NOREPLACE must guarantee atomicity (i.e. it shouldn't be possible
for a file to be created on one host while it is overwritten by rename on
another host).

Filesystems converted:

9p, afs, ceph, coda, ecryptfs, kernfs, lustre, ncpfs, nfs, ocfs2, orangefs.

After this, we can get rid of the duplicate interfaces for rename.

Signed-off-by: Miklos Szeredi <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: David Howells <[email protected]> [AFS]
Acked-by: Mike Marshall <[email protected]>
Cc: Eric Van Hensbergen <[email protected]>
Cc: Ilya Dryomov <[email protected]>
Cc: Jan Harkes <[email protected]>
Cc: Tyler Hicks <[email protected]>
Cc: Oleg Drokin <[email protected]>
Cc: Trond Myklebust <[email protected]>
Cc: Mark Fasheh <[email protected]>
This commit is contained in:
Miklos Szeredi 2016-09-27 11:03:58 +02:00
commit 1cd66c93ba
17 changed files with 78 additions and 31 deletions
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8
fs/kernfs/dir.c
View file

@ -1096,13 +1096,17 @@ static int kernfs_iop_rmdir(struct inode *dir, struct dentry *dentry)
}
static int kernfs_iop_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
struct kernfs_node *kn = old_dentry->d_fsdata;
struct kernfs_node *new_parent = new_dir->i_private;
struct kernfs_syscall_ops *scops = kernfs_root(kn)->syscall_ops;
int ret;
if (flags)
return -EINVAL;
if (!scops || !scops->rename)
return -EPERM;
@ -1133,7 +1137,7 @@ const struct inode_operations kernfs_dir_iops = {
.mkdir = kernfs_iop_mkdir,
.rmdir = kernfs_iop_rmdir,
.rename = kernfs_iop_rename,
.rename2 = kernfs_iop_rename,
};
static struct kernfs_node *kernfs_leftmost_descendant(struct kernfs_node *pos)