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NFS: Fix comparison between DS address lists

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data_server_cache entries should only be treated as the same if the address
list hasn't changed.

A new entry will be made when an MDS changes an address list (as seen by
GETDEVINFO). The old entry will be freed once all references are gone.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Weston Andros Adamson 2012-02-03 15:45:40 -05:00 committed by Trond Myklebust
parent a030889a01
commit 2d3fe01c36
1 changed files with 24 additions and 47 deletions
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71
fs/nfs/nfs4filelayoutdev.c
View file

@ -108,58 +108,40 @@ same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
return false;
}
/*
* Lookup DS by addresses. The first matching address returns true.
* nfs4_ds_cache_lock is held
*/
static struct nfs4_pnfs_ds *
_data_server_lookup_locked(struct list_head *dsaddrs)
bool
_same_data_server_addrs_locked(const struct list_head *dsaddrs1,
const struct list_head *dsaddrs2)
{
struct nfs4_pnfs_ds *ds;
struct nfs4_pnfs_ds_addr *da1, *da2;
list_for_each_entry(da1, dsaddrs, da_node) {
list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) {
list_for_each_entry(da2, &ds->ds_addrs, da_node) {
if (same_sockaddr(
(struct sockaddr *)&da1->da_addr,
(struct sockaddr *)&da2->da_addr))
return ds;
}
}
/* step through both lists, comparing as we go */
for (da1 = list_first_entry(dsaddrs1, typeof(*da1), da_node),
da2 = list_first_entry(dsaddrs2, typeof(*da2), da_node);
da1 != NULL && da2 != NULL;
da1 = list_entry(da1->da_node.next, typeof(*da1), da_node),
da2 = list_entry(da2->da_node.next, typeof(*da2), da_node)) {
if (!same_sockaddr((struct sockaddr *)&da1->da_addr,
(struct sockaddr *)&da2->da_addr))
return false;
}
return NULL;
if (da1 == NULL && da2 == NULL)
return true;
return false;
}
/*
* Compare two lists of addresses.
* Lookup DS by addresses. nfs4_ds_cache_lock is held
*/
static bool
_data_server_match_all_addrs_locked(struct list_head *dsaddrs1,
struct list_head *dsaddrs2)
static struct nfs4_pnfs_ds *
_data_server_lookup_locked(const struct list_head *dsaddrs)
{
struct nfs4_pnfs_ds_addr *da1, *da2;
size_t count1 = 0,
count2 = 0;
struct nfs4_pnfs_ds *ds;
list_for_each_entry(da1, dsaddrs1, da_node)
count1++;
list_for_each_entry(da2, dsaddrs2, da_node) {
bool found = false;
count2++;
list_for_each_entry(da1, dsaddrs1, da_node) {
if (same_sockaddr((struct sockaddr *)&da1->da_addr,
(struct sockaddr *)&da2->da_addr)) {
found = true;
break;
}
}
if (!found)
return false;
}
return (count1 == count2);
list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
return ds;
return NULL;
}
/*
@ -356,11 +338,6 @@ nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
dprintk("%s add new data server %s\n", __func__,
ds->ds_remotestr);
} else {
if (!_data_server_match_all_addrs_locked(&tmp_ds->ds_addrs,
dsaddrs)) {
dprintk("%s: multipath address mismatch: %s != %s",
__func__, tmp_ds->ds_remotestr, remotestr);
}
kfree(remotestr);
kfree(ds);
atomic_inc(&tmp_ds->ds_count);