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vfs: push dentry_unhash on rename_dir into file systems

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Only a few file systems need this.  Start by pushing it down into each
rename method (except gfs2 and xfs) so that it can be dealt with on a
per-fs basis.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Sage Weil
2011-05-24 13:06:07 -07:00
committed by Al Viro
parent 79bf7c732b
commit e4eaac06bc
36 changed files with 110 additions and 12 deletions
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12
fs/namei.c
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@@ -2950,12 +2950,7 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname
* HOWEVER, it relies on the assumption that any object with ->lookup()
* has no more than 1 dentry. If "hybrid" objects will ever appear,
* we'd better make sure that there's no link(2) for them.
* d) some filesystems don't support opened-but-unlinked directories,
* either because of layout or because they are not ready to deal with
* all cases correctly. The latter will be fixed (taking this sort of
* stuff into VFS), but the former is not going away. Solution: the same
* trick as in rmdir().
* e) conversion from fhandle to dentry may come in the wrong moment - when
* d) conversion from fhandle to dentry may come in the wrong moment - when
* we are removing the target. Solution: we will have to grab ->i_mutex
* in the fhandle_to_dentry code. [FIXME - current nfsfh.c relies on
* ->i_mutex on parents, which works but leads to some truly excessive
@@ -2986,11 +2981,8 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
mutex_lock(&target->i_mutex);
if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
error = -EBUSY;
else {
if (target)
dentry_unhash(new_dentry);
else
error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
}
if (target) {
if (!error) {
target->i_flags |= S_DEAD;