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NFSD: Clean up forgetting and recalling delegations 

Once I have a client, I can easily use its delegation list rather than
searching the file hash table for delegations to remove.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Bryan Schumaker 2012-11-29 11:40:42 -05:00 committed by J. Bruce Fields
parent 4dbdbda84f
commit 269de30f10
1 changed files with 50 additions and 44 deletions
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94
fs/nfsd/nfs4state.c
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@ -4657,6 +4657,52 @@ u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
return nfsd_foreach_client_open(clp, max, release_openowner);
}
static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
struct list_head *victims)
{
struct nfs4_delegation *dp, *next;
u64 count = 0;
list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
if (victims)
list_move(&dp->dl_recall_lru, victims);
if (++count == max)
break;
}
return count;
}
u64 nfsd_forget_client_delegations(struct nfs4_client *clp, u64 max)
{
struct nfs4_delegation *dp, *next;
LIST_HEAD(victims);
u64 count;
spin_lock(&recall_lock);
count = nfsd_find_all_delegations(clp, max, &victims);
spin_unlock(&recall_lock);
list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
unhash_delegation(dp);
return count;
}
u64 nfsd_recall_client_delegations(struct nfs4_client *clp, u64 max)
{
struct nfs4_delegation *dp, *next;
LIST_HEAD(victims);
u64 count;
spin_lock(&recall_lock);
count = nfsd_find_all_delegations(clp, max, &victims);
list_for_each_entry_safe(dp, next, &victims, dl_recall_lru)
nfsd_break_one_deleg(dp);
spin_unlock(&recall_lock);
return count;
}
u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
{
struct nfs4_client *clp, *next;
@ -4693,56 +4739,16 @@ void nfsd_forget_openowners(u64 num)
printk(KERN_INFO "NFSD: Forgot %llu open owners", count);
}
static int nfsd_process_n_delegations(u64 num, struct list_head *list)
{
int i, count = 0;
struct nfs4_file *fp, *fnext;
struct nfs4_delegation *dp, *dnext;
for (i = 0; i < FILE_HASH_SIZE; i++) {
list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
list_move(&dp->dl_recall_lru, list);
if (++count == num)
return count;
}
}
}
return count;
}
void nfsd_forget_delegations(u64 num)
{
unsigned int count;
LIST_HEAD(victims);
struct nfs4_delegation *dp, *dnext;
spin_lock(&recall_lock);
count = nfsd_process_n_delegations(num, &victims);
spin_unlock(&recall_lock);
list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru)
unhash_delegation(dp);
printk(KERN_INFO "NFSD: Forgot %d delegations", count);
u64 count = nfsd_for_n_state(num, nfsd_forget_client_delegations);
printk(KERN_INFO "NFSD: Forgot %llu delegations", count);
}
void nfsd_recall_delegations(u64 num)
{
unsigned int count;
LIST_HEAD(victims);
struct nfs4_delegation *dp, *dnext;
spin_lock(&recall_lock);
count = nfsd_process_n_delegations(num, &victims);
list_for_each_entry_safe(dp, dnext, &victims, dl_recall_lru) {
list_del(&dp->dl_recall_lru);
nfsd_break_one_deleg(dp);
}
spin_unlock(&recall_lock);
printk(KERN_INFO "NFSD: Recalled %d delegations", count);
u64 count = nfsd_for_n_state(num, nfsd_recall_client_delegations);
printk(KERN_INFO "NFSD: Recalled %llu delegations", count);
}
#endif /* CONFIG_NFSD_FAULT_INJECTION */