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NFSv4/pnfs: Add tracing for the deviceid cache

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Add tracepoints to allow debugging of the deviceid cache.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2020-12-16 16:31:26 -05:00
parent 3316fb80a0
commit cac1d3a2b8
3 changed files with 92 additions and 8 deletions
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23
fs/nfs/pnfs_dev.c
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@ -34,6 +34,8 @@
#include "internal.h"
#include "pnfs.h"
#include "nfs4trace.h"
#define NFSDBG_FACILITY NFSDBG_PNFS
/*
@ -192,24 +194,28 @@ nfs4_find_get_deviceid(struct nfs_server *server,
d = __nfs4_find_get_deviceid(server, id, hash);
if (d)
return d;
goto found;
new = nfs4_get_device_info(server, id, cred, gfp_mask);
if (!new)
if (!new) {
trace_nfs4_find_deviceid(server, id, -ENOENT);
return new;
}
spin_lock(&nfs4_deviceid_lock);
d = __nfs4_find_get_deviceid(server, id, hash);
if (d) {
spin_unlock(&nfs4_deviceid_lock);
server->pnfs_curr_ld->free_deviceid_node(new);
return d;
} else {
atomic_inc(&new->ref);
hlist_add_head_rcu(&new->node, &nfs4_deviceid_cache[hash]);
spin_unlock(&nfs4_deviceid_lock);
d = new;
}
hlist_add_head_rcu(&new->node, &nfs4_deviceid_cache[hash]);
atomic_inc(&new->ref);
spin_unlock(&nfs4_deviceid_lock);
return new;
found:
trace_nfs4_find_deviceid(server, id, 0);
return d;
}
EXPORT_SYMBOL_GPL(nfs4_find_get_deviceid);
@ -278,6 +284,7 @@ nfs4_put_deviceid_node(struct nfs4_deviceid_node *d)
}
if (!atomic_dec_and_test(&d->ref))
return false;
trace_nfs4_deviceid_free(d->nfs_client, &d->deviceid);
d->ld->free_deviceid_node(d);
return true;
}