* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
*/
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/nfsd/export.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
-#include <linux/lockd/sm_inter.h>
+#include <linux/module.h>
+#include <linux/mount.h>
#define NLMDBG_FACILITY NLMDBG_SVCSUBS
/*
* Global file hash table
*/
-#define FILE_HASH_BITS 5
+#define FILE_HASH_BITS 7
#define FILE_NRHASH (1<<FILE_HASH_BITS)
-static struct nlm_file * nlm_files[FILE_NRHASH];
+static struct hlist_head nlm_files[FILE_NRHASH];
static DEFINE_MUTEX(nlm_file_mutex);
#ifdef NFSD_DEBUG
static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
{
- struct inode *inode = file->f_file->f_dentry->d_inode;
+ struct inode *inode = file->f_file->f_path.dentry->d_inode;
dprintk("lockd: %s %s/%ld\n",
msg, inode->i_sb->s_id, inode->i_ino);
* This is not quite right, but for now, we assume the client performs
* the proper R/W checking.
*/
-u32
+__be32
nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
struct nfs_fh *f)
{
+ struct hlist_node *pos;
struct nlm_file *file;
unsigned int hash;
- u32 nfserr;
+ __be32 nfserr;
- nlm_debug_print_fh("nlm_file_lookup", f);
+ nlm_debug_print_fh("nlm_lookup_file", f);
hash = file_hash(f);
/* Lock file table */
mutex_lock(&nlm_file_mutex);
- for (file = nlm_files[hash]; file; file = file->f_next)
+ hlist_for_each_entry(file, pos, &nlm_files[hash], f_list)
if (!nfs_compare_fh(&file->f_handle, f))
goto found;
nlm_debug_print_fh("creating file for", f);
nfserr = nlm_lck_denied_nolocks;
- file = (struct nlm_file *) kmalloc(sizeof(*file), GFP_KERNEL);
+ file = kzalloc(sizeof(*file), GFP_KERNEL);
if (!file)
goto out_unlock;
- memset(file, 0, sizeof(*file));
memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
- file->f_hash = hash;
- init_MUTEX(&file->f_sema);
+ mutex_init(&file->f_mutex);
+ INIT_HLIST_NODE(&file->f_list);
+ INIT_LIST_HEAD(&file->f_blocks);
/* Open the file. Note that this must not sleep for too long, else
* we would lock up lockd:-) So no NFS re-exports, folks.
* the file.
*/
if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
- dprintk("lockd: open failed (nfserr %d)\n", ntohl(nfserr));
+ dprintk("lockd: open failed (error %d)\n", nfserr);
goto out_free;
}
- file->f_next = nlm_files[hash];
- nlm_files[hash] = file;
+ hlist_add_head(&file->f_list, &nlm_files[hash]);
found:
dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
out_free:
kfree(file);
-#ifdef CONFIG_LOCKD_V4
- if (nfserr == 1)
- nfserr = nlm4_stale_fh;
- else
-#endif
- nfserr = nlm_lck_denied;
goto out_unlock;
}
static inline void
nlm_delete_file(struct nlm_file *file)
{
- struct nlm_file **fp, *f;
-
nlm_debug_print_file("closing file", file);
-
- fp = nlm_files + file->f_hash;
- while ((f = *fp) != NULL) {
- if (f == file) {
- *fp = file->f_next;
- nlmsvc_ops->fclose(file->f_file);
- kfree(file);
- return;
- }
- fp = &f->f_next;
+ if (!hlist_unhashed(&file->f_list)) {
+ hlist_del(&file->f_list);
+ nlmsvc_ops->fclose(file->f_file);
+ kfree(file);
+ } else {
+ printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
}
-
- printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
}
/*
* action.
*/
static int
-nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, int action)
+nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
+ nlm_host_match_fn_t match)
{
struct inode *inode = nlmsvc_file_inode(file);
struct file_lock *fl;
/* update current lock count */
file->f_locks++;
+
lockhost = (struct nlm_host *) fl->fl_owner;
- if (action == NLM_ACT_MARK)
- lockhost->h_inuse = 1;
- else if (action == NLM_ACT_CHECK)
- return 1;
- else if (action == NLM_ACT_UNLOCK) {
+ if (match(lockhost, host)) {
struct file_lock lock = *fl;
- if (host && lockhost != host)
- continue;
-
lock.fl_type = F_UNLCK;
lock.fl_start = 0;
lock.fl_end = OFFSET_MAX;
- if (posix_lock_file(file->f_file, &lock) < 0) {
+ if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
printk("lockd: unlock failure in %s:%d\n",
__FILE__, __LINE__);
return 1;
return 0;
}
+static int
+nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2)
+{
+ return 1;
+}
+
+/*
+ * Inspect a single file
+ */
+static inline int
+nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
+{
+ nlmsvc_traverse_blocks(host, file, match);
+ nlmsvc_traverse_shares(host, file, match);
+ return nlm_traverse_locks(host, file, match);
+}
+
/*
- * Operate on a single file
+ * Quick check whether there are still any locks, blocks or
+ * shares on a given file.
*/
static inline int
-nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, int action)
+nlm_file_inuse(struct nlm_file *file)
{
- if (action == NLM_ACT_CHECK) {
- /* Fast path for mark and sweep garbage collection */
- if (file->f_count || file->f_blocks || file->f_shares)
+ struct inode *inode = nlmsvc_file_inode(file);
+ struct file_lock *fl;
+
+ if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
+ return 1;
+
+ for (fl = inode->i_flock; fl; fl = fl->fl_next) {
+ if (fl->fl_lmops == &nlmsvc_lock_operations)
return 1;
- } else {
- nlmsvc_traverse_blocks(host, file, action);
- nlmsvc_traverse_shares(host, file, action);
}
- return nlm_traverse_locks(host, file, action);
+ file->f_locks = 0;
+ return 0;
}
/*
* Loop over all files in the file table.
*/
static int
-nlm_traverse_files(struct nlm_host *host, int action)
+nlm_traverse_files(void *data, nlm_host_match_fn_t match,
+ int (*is_failover_file)(void *data, struct nlm_file *file))
{
- struct nlm_file *file, **fp;
- int i;
+ struct hlist_node *pos, *next;
+ struct nlm_file *file;
+ int i, ret = 0;
mutex_lock(&nlm_file_mutex);
for (i = 0; i < FILE_NRHASH; i++) {
- fp = nlm_files + i;
- while ((file = *fp) != NULL) {
+ hlist_for_each_entry_safe(file, pos, next, &nlm_files[i], f_list) {
+ if (is_failover_file && !is_failover_file(data, file))
+ continue;
+ file->f_count++;
+ mutex_unlock(&nlm_file_mutex);
+
/* Traverse locks, blocks and shares of this file
* and update file->f_locks count */
- if (nlm_inspect_file(host, file, action)) {
- mutex_unlock(&nlm_file_mutex);
- return 1;
- }
+ if (nlm_inspect_file(data, file, match))
+ ret = 1;
+ mutex_lock(&nlm_file_mutex);
+ file->f_count--;
/* No more references to this file. Let go of it. */
- if (!file->f_blocks && !file->f_locks
+ if (list_empty(&file->f_blocks) && !file->f_locks
&& !file->f_shares && !file->f_count) {
- *fp = file->f_next;
+ hlist_del(&file->f_list);
nlmsvc_ops->fclose(file->f_file);
kfree(file);
- } else {
- fp = &file->f_next;
}
}
}
mutex_unlock(&nlm_file_mutex);
- return 0;
+ return ret;
}
/*
mutex_lock(&nlm_file_mutex);
/* If there are no more locks etc, delete the file */
- if(--file->f_count == 0) {
- if(!nlm_inspect_file(NULL, file, NLM_ACT_CHECK))
- nlm_delete_file(file);
- }
+ if (--file->f_count == 0 && !nlm_file_inuse(file))
+ nlm_delete_file(file);
mutex_unlock(&nlm_file_mutex);
}
/*
+ * Helpers function for resource traversal
+ *
+ * nlmsvc_mark_host:
+ * used by the garbage collector; simply sets h_inuse.
+ * Always returns 0.
+ *
+ * nlmsvc_same_host:
+ * returns 1 iff the two hosts match. Used to release
+ * all resources bound to a specific host.
+ *
+ * nlmsvc_is_client:
+ * returns 1 iff the host is a client.
+ * Used by nlmsvc_invalidate_all
+ */
+static int
+nlmsvc_mark_host(void *data, struct nlm_host *dummy)
+{
+ struct nlm_host *host = data;
+
+ host->h_inuse = 1;
+ return 0;
+}
+
+static int
+nlmsvc_same_host(void *data, struct nlm_host *other)
+{
+ struct nlm_host *host = data;
+
+ return host == other;
+}
+
+static int
+nlmsvc_is_client(void *data, struct nlm_host *dummy)
+{
+ struct nlm_host *host = data;
+
+ if (host->h_server) {
+ /* we are destroying locks even though the client
+ * hasn't asked us too, so don't unmonitor the
+ * client
+ */
+ if (host->h_nsmhandle)
+ host->h_nsmhandle->sm_sticky = 1;
+ return 1;
+ } else
+ return 0;
+}
+
+/*
* Mark all hosts that still hold resources
*/
void
nlmsvc_mark_resources(void)
{
dprintk("lockd: nlmsvc_mark_resources\n");
-
- nlm_traverse_files(NULL, NLM_ACT_MARK);
+ nlm_traverse_files(NULL, nlmsvc_mark_host, NULL);
}
/*
{
dprintk("lockd: nlmsvc_free_host_resources\n");
- if (nlm_traverse_files(host, NLM_ACT_UNLOCK))
+ if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
printk(KERN_WARNING
- "lockd: couldn't remove all locks held by %s",
+ "lockd: couldn't remove all locks held by %s\n",
host->h_name);
+ BUG();
+ }
}
-/*
- * delete all hosts structs for clients
+/**
+ * nlmsvc_invalidate_all - remove all locks held for clients
+ *
+ * Release all locks held by NFS clients.
+ *
*/
void
nlmsvc_invalidate_all(void)
{
- struct nlm_host *host;
- while ((host = nlm_find_client()) != NULL) {
- nlmsvc_free_host_resources(host);
- host->h_expires = 0;
- host->h_killed = 1;
- nlm_release_host(host);
- }
+ /*
+ * Previously, the code would call
+ * nlmsvc_free_host_resources for each client in
+ * turn, which is about as inefficient as it gets.
+ * Now we just do it once in nlm_traverse_files.
+ */
+ nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
+}
+
+static int
+nlmsvc_match_sb(void *datap, struct nlm_file *file)
+{
+ struct super_block *sb = datap;
+
+ return sb == file->f_file->f_path.mnt->mnt_sb;
+}
+
+/**
+ * nlmsvc_unlock_all_by_sb - release locks held on this file system
+ * @sb: super block
+ *
+ * Release all locks held by clients accessing this file system.
+ */
+int
+nlmsvc_unlock_all_by_sb(struct super_block *sb)
+{
+ int ret;
+
+ ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
+ return ret ? -EIO : 0;
+}
+EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
+
+static int
+nlmsvc_match_ip(void *datap, struct nlm_host *host)
+{
+ return rpc_cmp_addr(nlm_srcaddr(host), datap);
+}
+
+/**
+ * nlmsvc_unlock_all_by_ip - release local locks by IP address
+ * @server_addr: server's IP address as seen by clients
+ *
+ * Release all locks held by clients accessing this host
+ * via the passed in IP address.
+ */
+int
+nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
+{
+ int ret;
+
+ ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
+ return ret ? -EIO : 0;
}
+EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff