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name cache: rename leaves behind a negative entry

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as before, we move the src entry from src_parent to dst_parent.  but instead of unlinking the destination entry if it exists, we recycle it as a negative entry where src used to be.  if the destination entry doesn't exist, we create a new one for this negative entry

if the dst_parent entry is invalidated by the change_info, we just leave the original src entry in place and make it negative

Signed-off-by: Casey Bodley <cbodley@umich.edu>
This commit is contained in:
Casey Bodley 2010-10-11 16:07:26 -04:00
parent bc81c3f6f5
commit 765bc0284b
1 changed files with 44 additions and 32 deletions
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76
daemon/name_cache.c
View file

@ -708,27 +708,6 @@ out_err:
goto out;
}
static void name_cache_rename(
IN struct nfs41_name_cache *cache,
IN struct name_cache_entry *src_dir,
IN struct name_cache_entry *src,
IN struct name_cache_entry *dst_dir,
IN const nfs41_component *component,
OUT struct name_cache_entry **dst_out)
{
struct name_cache_entry *existing;
name_cache_remove(src, src_dir);
name_cache_entry_rename(src, component);
existing = name_cache_search(cache, dst_dir, component);
if (existing)
name_cache_unlink(cache, existing);
name_cache_insert(src, dst_dir);
}
/* public name cache interface, declared in name_cache.h */
@ -1020,7 +999,7 @@ int nfs41_name_cache_rename(
IN const nfs41_component *dst_name,
IN const change_info4 *dst_cinfo)
{
struct name_cache_entry *src_parent, *target;
struct name_cache_entry *src_parent, *src;
struct name_cache_entry *dst_parent;
int status = NO_ERROR;
@ -1034,13 +1013,14 @@ int nfs41_name_cache_rename(
goto out_unlock;
}
/* get src_parent and target */
/* look up src_parent and src */
status = name_cache_lookup(cache, 0, src_path,
src_name->name + src_name->len, NULL, &src_parent, &target, NULL);
if (status)
src_name->name + src_name->len, NULL, &src_parent, &src, NULL);
/* we can't create the dst entry without valid attributes */
if (status || src->attributes == NULL)
goto out_unlock;
/* get dst_parent */
/* look up dst_parent */
status = name_cache_lookup(cache, 0, dst_path,
dst_name->name, NULL, NULL, &dst_parent, NULL);
if (status) {
@ -1049,15 +1029,47 @@ int nfs41_name_cache_rename(
}
if (name_cache_entry_changed(cache, dst_parent, dst_cinfo)) {
name_cache_unlink(cache, target);
name_cache_entry_invalidate(cache, dst_parent);
} else
name_cache_rename(cache, src_parent, target,
dst_parent, dst_name, &target);
/* if dst_parent and src_parent are both gone,
* we no longer have an entry to rename */
if (dst_parent == src_parent)
goto out_unlock;
} else {
struct name_cache_entry *existing;
existing = name_cache_search(cache, dst_parent, dst_name);
if (existing) {
/* remove the existing entry, but don't unlink it yet;
* we may reuse it for a negative entry */
name_cache_remove(existing, dst_parent);
}
if (dst_parent != src_parent
&& name_cache_entry_changed(cache, src_parent, src_cinfo))
/* move the src entry under dst_parent */
name_cache_remove(src, src_parent);
name_cache_entry_rename(src, dst_name);
name_cache_insert(src, dst_parent);
if (existing) {
/* recycle 'existing' as the negative entry 'src' */
name_cache_entry_rename(existing, src_name);
name_cache_insert(existing, src_parent);
}
src = existing;
}
if (name_cache_entry_changed(cache, src_parent, src_cinfo)) {
name_cache_entry_invalidate(cache, src_parent);
goto out_unlock;
}
/* leave a negative entry where the file used to be */
if (src == NULL) {
/* src was moved, create a new entry in its place */
status = name_cache_find_or_create(cache, src_parent, src_name, &src);
if (status)
goto out_unlock;
}
name_cache_entry_update(cache, src, NULL, NULL);
name_cache_unlink_children_recursive(cache, src);
out_unlock:
ReleaseSRWLockExclusive(&cache->lock);