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author | J. Bruce Fields <bfields@citi.umich.edu> | 2010-12-14 15:05:03 (GMT) |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-12-16 17:37:26 (GMT) |
commit | b113746888c260a02f6ae1e92b0b9ef7e9c38993 (patch) | |
tree | ad9e89b3e5bae544d3a9b04bc8feb02d2ee4b17c /fs | |
parent | bf2695516db982e90a22fc94f93491b481796bb1 (diff) | |
download | linux-fsl-qoriq-b113746888c260a02f6ae1e92b0b9ef7e9c38993.tar.xz |
lockd: define host_for_each{_safe} macros
We've got a lot of loops like this, and I find them a little easier to
read with the macros. More such loops are coming.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
[ cel: Forward-ported to 2.6.37 ]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/lockd/host.c | 107 |
1 files changed, 55 insertions, 52 deletions
diff --git a/fs/lockd/host.c b/fs/lockd/host.c index ed0c59f..cada3a1 100644 --- a/fs/lockd/host.c +++ b/fs/lockd/host.c @@ -26,6 +26,18 @@ #define NLM_HOST_COLLECT (120 * HZ) static struct hlist_head nlm_hosts[NLM_HOST_NRHASH]; + +#define for_each_host(host, pos, chain, table) \ + for ((chain) = (table); \ + (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ + hlist_for_each_entry((host), (pos), (chain), h_hash) + +#define for_each_host_safe(host, pos, next, chain, table) \ + for ((chain) = (table); \ + (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \ + hlist_for_each_entry_safe((host), (pos), (next), \ + (chain), h_hash) + static unsigned long next_gc; static int nrhosts; static DEFINE_MUTEX(nlm_host_mutex); @@ -453,28 +465,26 @@ void nlm_host_rebooted(const struct nlm_reboot *info) * To avoid processing a host several times, we match the nsmstate. */ again: mutex_lock(&nlm_host_mutex); - for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { - hlist_for_each_entry(host, pos, chain, h_hash) { - if (host->h_nsmhandle == nsm - && host->h_nsmstate != info->state) { - host->h_nsmstate = info->state; - host->h_state++; - - nlm_get_host(host); - mutex_unlock(&nlm_host_mutex); - - if (host->h_server) { - /* We're server for this guy, just ditch - * all the locks he held. */ - nlmsvc_free_host_resources(host); - } else { - /* He's the server, initiate lock recovery. */ - nlmclnt_recovery(host); - } - - nlm_release_host(host); - goto again; + for_each_host(host, pos, chain, nlm_hosts) { + if (host->h_nsmhandle == nsm + && host->h_nsmstate != info->state) { + host->h_nsmstate = info->state; + host->h_state++; + + nlm_get_host(host); + mutex_unlock(&nlm_host_mutex); + + if (host->h_server) { + /* We're server for this guy, just ditch + * all the locks he held. */ + nlmsvc_free_host_resources(host); + } else { + /* He's the server, initiate lock recovery. */ + nlmclnt_recovery(host); } + + nlm_release_host(host); + goto again; } } mutex_unlock(&nlm_host_mutex); @@ -497,13 +507,11 @@ nlm_shutdown_hosts(void) /* First, make all hosts eligible for gc */ dprintk("lockd: nuking all hosts...\n"); - for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { - hlist_for_each_entry(host, pos, chain, h_hash) { - host->h_expires = jiffies - 1; - if (host->h_rpcclnt) { - rpc_shutdown_client(host->h_rpcclnt); - host->h_rpcclnt = NULL; - } + for_each_host(host, pos, chain, nlm_hosts) { + host->h_expires = jiffies - 1; + if (host->h_rpcclnt) { + rpc_shutdown_client(host->h_rpcclnt); + host->h_rpcclnt = NULL; } } @@ -515,12 +523,10 @@ nlm_shutdown_hosts(void) if (nrhosts) { printk(KERN_WARNING "lockd: couldn't shutdown host module!\n"); dprintk("lockd: %d hosts left:\n", nrhosts); - for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { - hlist_for_each_entry(host, pos, chain, h_hash) { - dprintk(" %s (cnt %d use %d exp %ld)\n", - host->h_name, atomic_read(&host->h_count), - host->h_inuse, host->h_expires); - } + for_each_host(host, pos, chain, nlm_hosts) { + dprintk(" %s (cnt %d use %d exp %ld)\n", + host->h_name, atomic_read(&host->h_count), + host->h_inuse, host->h_expires); } } } @@ -538,29 +544,26 @@ nlm_gc_hosts(void) struct nlm_host *host; dprintk("lockd: host garbage collection\n"); - for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { - hlist_for_each_entry(host, pos, chain, h_hash) - host->h_inuse = 0; - } + for_each_host(host, pos, chain, nlm_hosts) + host->h_inuse = 0; /* Mark all hosts that hold locks, blocks or shares */ nlmsvc_mark_resources(); - for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) { - hlist_for_each_entry_safe(host, pos, next, chain, h_hash) { - if (atomic_read(&host->h_count) || host->h_inuse - || time_before(jiffies, host->h_expires)) { - dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n", - host->h_name, atomic_read(&host->h_count), - host->h_inuse, host->h_expires); - continue; - } - dprintk("lockd: delete host %s\n", host->h_name); - hlist_del_init(&host->h_hash); - - nlm_destroy_host(host); - nrhosts--; + for_each_host_safe(host, pos, next, chain, nlm_hosts) { + if (atomic_read(&host->h_count) || host->h_inuse + || time_before(jiffies, host->h_expires)) { + dprintk("nlm_gc_hosts skipping %s " + "(cnt %d use %d exp %ld)\n", + host->h_name, atomic_read(&host->h_count), + host->h_inuse, host->h_expires); + continue; } + dprintk("lockd: delete host %s\n", host->h_name); + hlist_del_init(&host->h_hash); + + nlm_destroy_host(host); + nrhosts--; } next_gc = jiffies + NLM_HOST_COLLECT; |