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name cache: lookup semantics match nfs41_lookup() on NOENT

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previously, when the name cache encountered a missing/negative/expired entry, it returned the previous two entries as 'target' and 'parent', and nfs41_lookup() started new lookups from the filehandle in 'target'.  this differs from nfs41_lookup(), which on NOENT will return NULL for the 'target' and the previous entry as 'parent'.  modified name_cache_lookup() to do the same, and updated nfs41_lookup() to start new lookups from the filehandle in 'parent'

now when nfs41_lookup() gets the is_negative flag from nfs41_name_cache_lookup(), it can just return the error without needing to copy the 'target' to 'parent'

Signed-off-by: Casey Bodley <cbodley@umich.edu>
This commit is contained in:
Casey Bodley 2010-10-11 16:07:53 -04:00
parent 765bc0284b
commit 794dfeca49
2 changed files with 12 additions and 12 deletions
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10
daemon/lookup.c
View file

@ -458,14 +458,14 @@ int nfs41_lookup(
if (status == NO_ERROR || negative)
goto out;
if (target_out->fh.len) {
if (parent_out->fh.len) {
/* start where the name cache left off */
if (target_out != &target) {
if (&parent != parent_out) {
/* must make a copy for server_start, because
* server_lookup_loop() will overwrite target_out */
path_fh_copy(&target, target_out);
* server_lookup_loop() will overwrite parent_out */
path_fh_copy(&parent, parent_out);
}
server_start = &target;
server_start = &parent;
} else {
/* start with PUTROOTFH */
server_start = NULL;

14
daemon/name_cache.c
View file

@ -595,7 +595,7 @@ static int name_cache_lookup(
OUT OPTIONAL struct name_cache_entry **target_out,
OUT OPTIONAL bool_t *is_negative)
{
struct name_cache_entry *parent, *target, *tmp;
struct name_cache_entry *parent, *target;
nfs41_component component;
const char *path_pos;
int status = NO_ERROR;
@ -613,17 +613,16 @@ static int name_cache_lookup(
}
while (next_component(path_pos, path_end, &component)) {
tmp = name_cache_search(cache, target, &component);
if (tmp == NULL || (skip_invis && entry_invis(tmp, is_negative))) {
parent = target;
target = name_cache_search(cache, parent, &component);
path_pos = component.name + component.len;
if (target == NULL || (skip_invis && entry_invis(target, is_negative))) {
if (is_last_component(component.name, path_end))
status = ERROR_FILE_NOT_FOUND;
else
status = ERROR_PATH_NOT_FOUND;
break;
}
parent = target;
target = tmp;
path_pos = component.name + component.len;
}
out:
if (remaining_path_out) *remaining_path_out = component.name;
@ -812,7 +811,8 @@ int nfs41_name_cache_lookup(
if (parent_out) copy_fh(parent_out, parent);
if (target_out) copy_fh(target_out, target);
if (info_out && target) copy_attrs(info_out, target->attributes);
if (info_out && target && target->attributes)
copy_attrs(info_out, target->attributes);
out_unlock:
ReleaseSRWLockShared(&cache->lock);