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shmem: support RENAME_EXCHANGE

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This is really simple in tmpfs since the VFS already takes care of
shuffling the dentries.  Just adjust nlink on parent directories and touch
c & mtimes.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2014-07-23 15:15:34 +02:00 committed by Al Viro
parent 3b69ff51d0
commit 37456771c5
1 changed files with 26 additions and 1 deletions
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27
mm/shmem.c
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@ -2048,6 +2048,28 @@ static int shmem_rmdir(struct inode *dir, struct dentry *dentry)
return shmem_unlink(dir, dentry);
}
static int shmem_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry)
{
bool old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
bool new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
if (old_dir != new_dir && old_is_dir != new_is_dir) {
if (old_is_dir) {
drop_nlink(old_dir);
inc_nlink(new_dir);
} else {
drop_nlink(new_dir);
inc_nlink(old_dir);
}
}
old_dir->i_ctime = old_dir->i_mtime =
new_dir->i_ctime = new_dir->i_mtime =
old_dentry->d_inode->i_ctime =
new_dentry->d_inode->i_ctime = CURRENT_TIME;
return 0;
}
/*
* The VFS layer already does all the dentry stuff for rename,
* we just have to decrement the usage count for the target if
@ -2059,9 +2081,12 @@ static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struc
struct inode *inode = old_dentry->d_inode;
int they_are_dirs = S_ISDIR(inode->i_mode);
if (flags & ~(RENAME_NOREPLACE))
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
return -EINVAL;
if (flags & RENAME_EXCHANGE)
return shmem_exchange(old_dir, old_dentry, new_dir, new_dentry);
if (!simple_empty(new_dentry))
return -ENOTEMPTY;