#include <linux/proc_fs.h>
#include <linux/nls.h>
#include <linux/workqueue.h>
+#include <linux/uuid.h>
#include "cifsglob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
#include "cifs_debug.h"
#include "cifs_unicode.h"
#include "smb2glob.h"
-#include "fs_context.h"
#include "dfs_cache.h"
struct cache_dfs_tgt *tgthint;
};
-struct vol_info {
- char *fullpath;
- spinlock_t ctx_lock;
- struct smb3_fs_context ctx;
- char *mntdata;
+/* List of referral server sessions per dfs mount */
+struct mount_group {
struct list_head list;
- struct list_head rlist;
- struct kref refcnt;
+ uuid_t id;
+ struct cifs_ses *sessions[CACHE_MAX_ENTRIES];
+ int num_sessions;
+ spinlock_t lock;
+ struct list_head refresh_list;
+ struct kref refcount;
};
static struct kmem_cache *cache_slab __read_mostly;
static struct hlist_head cache_htable[CACHE_HTABLE_SIZE];
static DECLARE_RWSEM(htable_rw_lock);
-static LIST_HEAD(vol_list);
-static DEFINE_SPINLOCK(vol_list_lock);
+static LIST_HEAD(mount_group_list);
+static DEFINE_MUTEX(mount_group_list_lock);
static void refresh_cache_worker(struct work_struct *work);
static DECLARE_DELAYED_WORK(refresh_task, refresh_cache_worker);
+static void get_ipc_unc(const char *ref_path, char *ipc, size_t ipclen)
+{
+ const char *host;
+ size_t len;
+
+ extract_unc_hostname(ref_path, &host, &len);
+ scnprintf(ipc, ipclen, "\\\\%.*s\\IPC$", (int)len, host);
+}
+
+static struct cifs_ses *find_ipc_from_server_path(struct cifs_ses **ses, const char *path)
+{
+ char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
+
+ get_ipc_unc(path, unc, sizeof(unc));
+ for (; *ses; ses++) {
+ if (!strcasecmp(unc, (*ses)->tcon_ipc->treeName))
+ return *ses;
+ }
+ return ERR_PTR(-ENOENT);
+}
+
+static void __mount_group_release(struct mount_group *mg)
+{
+ int i;
+
+ for (i = 0; i < mg->num_sessions; i++)
+ cifs_put_smb_ses(mg->sessions[i]);
+ kfree(mg);
+}
+
+static void mount_group_release(struct kref *kref)
+{
+ struct mount_group *mg = container_of(kref, struct mount_group, refcount);
+
+ mutex_lock(&mount_group_list_lock);
+ list_del(&mg->list);
+ mutex_unlock(&mount_group_list_lock);
+ __mount_group_release(mg);
+}
+
+static struct mount_group *find_mount_group_locked(const uuid_t *id)
+{
+ struct mount_group *mg;
+
+ list_for_each_entry(mg, &mount_group_list, list) {
+ if (uuid_equal(&mg->id, id))
+ return mg;
+ }
+ return ERR_PTR(-ENOENT);
+}
+
+static struct mount_group *__get_mount_group_locked(const uuid_t *id)
+{
+ struct mount_group *mg;
+
+ mg = find_mount_group_locked(id);
+ if (!IS_ERR(mg))
+ return mg;
+
+ mg = kmalloc(sizeof(*mg), GFP_KERNEL);
+ if (!mg)
+ return ERR_PTR(-ENOMEM);
+ kref_init(&mg->refcount);
+ uuid_copy(&mg->id, id);
+ mg->num_sessions = 0;
+ spin_lock_init(&mg->lock);
+ list_add(&mg->list, &mount_group_list);
+ return mg;
+}
+
+static struct mount_group *get_mount_group(const uuid_t *id)
+{
+ struct mount_group *mg;
+
+ mutex_lock(&mount_group_list_lock);
+ mg = __get_mount_group_locked(id);
+ if (!IS_ERR(mg))
+ kref_get(&mg->refcount);
+ mutex_unlock(&mount_group_list_lock);
+
+ return mg;
+}
+
+static void free_mount_group_list(void)
+{
+ struct mount_group *mg, *tmp_mg;
+
+ list_for_each_entry_safe(mg, tmp_mg, &mount_group_list, list) {
+ list_del_init(&mg->list);
+ __mount_group_release(mg);
+ }
+}
+
static int get_normalized_path(const char *path, const char **npath)
{
if (!path || strlen(path) < 3 || (*path != '\\' && *path != '/'))
int rc;
int i;
- dfscache_wq = alloc_workqueue("cifs-dfscache",
- WQ_FREEZABLE | WQ_MEM_RECLAIM, 1);
+ dfscache_wq = alloc_workqueue("cifs-dfscache", WQ_FREEZABLE | WQ_UNBOUND, 1);
if (!dfscache_wq)
return -ENOMEM;
return ce;
}
-/* Must be called with htable_rw_lock held */
-static void remove_oldest_entry(void)
+static void remove_oldest_entry_locked(void)
{
int i;
struct cache_entry *ce;
}
/* Add a new DFS cache entry */
-static int add_cache_entry(const char *path, unsigned int hash,
- struct dfs_info3_param *refs, int numrefs)
+static int add_cache_entry_locked(const char *path, unsigned int hash,
+ struct dfs_info3_param *refs, int numrefs)
{
struct cache_entry *ce;
}
spin_unlock(&cache_ttl_lock);
- down_write(&htable_rw_lock);
hlist_add_head(&ce->hlist, &cache_htable[hash]);
dump_ce(ce);
- up_write(&htable_rw_lock);
return 0;
}
return ce;
}
-static void __vol_release(struct vol_info *vi)
-{
- kfree(vi->fullpath);
- kfree(vi->mntdata);
- smb3_cleanup_fs_context_contents(&vi->ctx);
- kfree(vi);
-}
-
-static void vol_release(struct kref *kref)
-{
- struct vol_info *vi = container_of(kref, struct vol_info, refcnt);
-
- spin_lock(&vol_list_lock);
- list_del(&vi->list);
- spin_unlock(&vol_list_lock);
- __vol_release(vi);
-}
-
-static inline void free_vol_list(void)
-{
- struct vol_info *vi, *nvi;
-
- list_for_each_entry_safe(vi, nvi, &vol_list, list) {
- list_del_init(&vi->list);
- __vol_release(vi);
- }
-}
-
/**
* dfs_cache_destroy - destroy DFS referral cache
*/
{
cancel_delayed_work_sync(&refresh_task);
unload_nls(cache_nlsc);
- free_vol_list();
+ free_mount_group_list();
flush_cache_ents();
kmem_cache_destroy(cache_slab);
destroy_workqueue(dfscache_wq);
cifs_dbg(FYI, "%s: destroyed DFS referral cache\n", __func__);
}
-/* Must be called with htable_rw_lock held */
-static int __update_cache_entry(const char *path,
- const struct dfs_info3_param *refs,
- int numrefs)
+/* Update a cache entry with the new referral in @refs */
+static int update_cache_entry_locked(const char *path, const struct dfs_info3_param *refs,
+ int numrefs)
{
int rc;
struct cache_entry *ce;
nls_codepage, remap);
}
-/* Update an expired cache entry by getting a new DFS referral from server */
-static int update_cache_entry(const char *path,
- const struct dfs_info3_param *refs,
- int numrefs)
-{
-
- int rc;
-
- down_write(&htable_rw_lock);
- rc = __update_cache_entry(path, refs, numrefs);
- up_write(&htable_rw_lock);
-
- return rc;
-}
-
/*
* Find, create or update a DFS cache entry.
*
* If the entry wasn't found, it will create a new one. Or if it was found but
* expired, then it will update the entry accordingly.
*
- * For interlinks, __cifs_dfs_mount() and expand_dfs_referral() are supposed to
+ * For interlinks, cifs_mount() and expand_dfs_referral() are supposed to
* handle them properly.
*/
-static int __dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
- const struct nls_table *nls_codepage, int remap, const char *path)
+static int cache_refresh_path(const unsigned int xid, struct cifs_ses *ses,
+ const struct nls_table *nls_codepage, int remap, const char *path)
{
int rc;
unsigned int hash;
cifs_dbg(FYI, "%s: search path: %s\n", __func__, path);
- down_read(&htable_rw_lock);
+ down_write(&htable_rw_lock);
ce = lookup_cache_entry(path, &hash);
if (!IS_ERR(ce)) {
if (!cache_entry_expired(ce)) {
dump_ce(ce);
- up_read(&htable_rw_lock);
+ up_write(&htable_rw_lock);
return 0;
}
} else {
newent = true;
}
- up_read(&htable_rw_lock);
-
/*
- * No entry was found.
- *
- * Request a new DFS referral in order to create a new cache entry, or
- * updating an existing one.
+ * Either the entry was not found, or it is expired.
+ * Request a new DFS referral in order to create or update a cache entry.
*/
rc = get_dfs_referral(xid, ses, nls_codepage, remap, path,
&refs, &numrefs);
if (rc)
- return rc;
+ goto out_unlock;
dump_refs(refs, numrefs);
if (!newent) {
- rc = update_cache_entry(path, refs, numrefs);
- goto out_free_refs;
+ rc = update_cache_entry_locked(path, refs, numrefs);
+ goto out_unlock;
}
if (atomic_read(&cache_count) >= CACHE_MAX_ENTRIES) {
- cifs_dbg(FYI, "%s: reached max cache size (%d)\n",
- __func__, CACHE_MAX_ENTRIES);
- down_write(&htable_rw_lock);
- remove_oldest_entry();
- up_write(&htable_rw_lock);
+ cifs_dbg(FYI, "%s: reached max cache size (%d)\n", __func__, CACHE_MAX_ENTRIES);
+ remove_oldest_entry_locked();
}
- rc = add_cache_entry(path, hash, refs, numrefs);
+ rc = add_cache_entry_locked(path, hash, refs, numrefs);
if (!rc)
atomic_inc(&cache_count);
-out_free_refs:
+out_unlock:
+ up_write(&htable_rw_lock);
free_dfs_info_array(refs, numrefs);
return rc;
}
if (rc)
return rc;
- rc = __dfs_cache_find(xid, ses, nls_codepage, remap, npath);
+ rc = cache_refresh_path(xid, ses, nls_codepage, remap, npath);
if (rc)
goto out_free_path;
cifs_dbg(FYI, "%s: update target hint - path: %s\n", __func__, npath);
- rc = __dfs_cache_find(xid, ses, nls_codepage, remap, npath);
+ rc = cache_refresh_path(xid, ses, nls_codepage, remap, npath);
if (rc)
goto out_free_path;
}
/**
- * dfs_cache_add_vol - add a cifs context during mount() that will be handled by
- * DFS cache refresh worker.
+ * dfs_cache_add_refsrv_session - add SMB session of referral server
*
- * @mntdata: mount data.
- * @ctx: cifs context.
- * @fullpath: origin full path.
- *
- * Return zero if context was set up correctly, otherwise non-zero.
+ * @mount_id: mount group uuid to lookup.
+ * @ses: reference counted SMB session of referral server.
*/
-int dfs_cache_add_vol(char *mntdata, struct smb3_fs_context *ctx, const char *fullpath)
+void dfs_cache_add_refsrv_session(const uuid_t *mount_id, struct cifs_ses *ses)
{
- int rc;
- struct vol_info *vi;
-
- if (!ctx || !fullpath || !mntdata)
- return -EINVAL;
-
- cifs_dbg(FYI, "%s: fullpath: %s\n", __func__, fullpath);
-
- vi = kzalloc(sizeof(*vi), GFP_KERNEL);
- if (!vi)
- return -ENOMEM;
-
- vi->fullpath = kstrdup(fullpath, GFP_KERNEL);
- if (!vi->fullpath) {
- rc = -ENOMEM;
- goto err_free_vi;
- }
-
- rc = smb3_fs_context_dup(&vi->ctx, ctx);
- if (rc)
- goto err_free_fullpath;
-
- vi->mntdata = mntdata;
- spin_lock_init(&vi->ctx_lock);
- kref_init(&vi->refcnt);
-
- spin_lock(&vol_list_lock);
- list_add_tail(&vi->list, &vol_list);
- spin_unlock(&vol_list_lock);
-
- return 0;
+ struct mount_group *mg;
-err_free_fullpath:
- kfree(vi->fullpath);
-err_free_vi:
- kfree(vi);
- return rc;
-}
+ if (WARN_ON_ONCE(!mount_id || uuid_is_null(mount_id) || !ses))
+ return;
-/* Must be called with vol_list_lock held */
-static struct vol_info *find_vol(const char *fullpath)
-{
- struct vol_info *vi;
+ mg = get_mount_group(mount_id);
+ if (WARN_ON_ONCE(IS_ERR(mg)))
+ return;
- list_for_each_entry(vi, &vol_list, list) {
- cifs_dbg(FYI, "%s: vi->fullpath: %s\n", __func__, vi->fullpath);
- if (!strcasecmp(vi->fullpath, fullpath))
- return vi;
- }
- return ERR_PTR(-ENOENT);
+ spin_lock(&mg->lock);
+ if (mg->num_sessions < ARRAY_SIZE(mg->sessions))
+ mg->sessions[mg->num_sessions++] = ses;
+ spin_unlock(&mg->lock);
+ kref_put(&mg->refcount, mount_group_release);
}
/**
- * dfs_cache_update_vol - update vol info in DFS cache after failover
+ * dfs_cache_put_refsrv_sessions - put all referral server sessions
*
- * @fullpath: fullpath to look up in volume list.
- * @server: TCP ses pointer.
- *
- * Return zero if volume was updated, otherwise non-zero.
- */
-int dfs_cache_update_vol(const char *fullpath, struct TCP_Server_Info *server)
-{
- struct vol_info *vi;
-
- if (!fullpath || !server)
- return -EINVAL;
-
- cifs_dbg(FYI, "%s: fullpath: %s\n", __func__, fullpath);
-
- spin_lock(&vol_list_lock);
- vi = find_vol(fullpath);
- if (IS_ERR(vi)) {
- spin_unlock(&vol_list_lock);
- return PTR_ERR(vi);
- }
- kref_get(&vi->refcnt);
- spin_unlock(&vol_list_lock);
-
- cifs_dbg(FYI, "%s: updating volume info\n", __func__);
- spin_lock(&vi->ctx_lock);
- memcpy(&vi->ctx.dstaddr, &server->dstaddr,
- sizeof(vi->ctx.dstaddr));
- spin_unlock(&vi->ctx_lock);
-
- kref_put(&vi->refcnt, vol_release);
-
- return 0;
-}
-
-/**
- * dfs_cache_del_vol - remove volume info in DFS cache during umount()
+ * Put all SMB sessions from the given mount group id.
*
- * @fullpath: fullpath to look up in volume list.
+ * @mount_id: mount group uuid to lookup.
*/
-void dfs_cache_del_vol(const char *fullpath)
+void dfs_cache_put_refsrv_sessions(const uuid_t *mount_id)
{
- struct vol_info *vi;
+ struct mount_group *mg;
- if (!fullpath || !*fullpath)
+ if (!mount_id || uuid_is_null(mount_id))
return;
- cifs_dbg(FYI, "%s: fullpath: %s\n", __func__, fullpath);
-
- spin_lock(&vol_list_lock);
- vi = find_vol(fullpath);
- spin_unlock(&vol_list_lock);
-
- if (!IS_ERR(vi))
- kref_put(&vi->refcnt, vol_release);
+ mutex_lock(&mount_group_list_lock);
+ mg = find_mount_group_locked(mount_id);
+ if (IS_ERR(mg)) {
+ mutex_unlock(&mount_group_list_lock);
+ return;
+ }
+ mutex_unlock(&mount_group_list_lock);
+ kref_put(&mg->refcount, mount_group_release);
}
/**
return 0;
}
-/* Get all tcons that are within a DFS namespace and can be refreshed */
-static void get_tcons(struct TCP_Server_Info *server, struct list_head *head)
+/*
+ * Refresh all active dfs mounts regardless of whether they are in cache or not.
+ * (cache can be cleared)
+ */
+static void refresh_mounts(struct cifs_ses **sessions)
{
+ struct TCP_Server_Info *server;
struct cifs_ses *ses;
- struct cifs_tcon *tcon;
+ struct cifs_tcon *tcon, *ntcon;
+ struct list_head tcons;
+ unsigned int xid;
- INIT_LIST_HEAD(head);
+ INIT_LIST_HEAD(&tcons);
spin_lock(&cifs_tcp_ses_lock);
- list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
- list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
- if (!tcon->need_reconnect && !tcon->need_reopen_files &&
- tcon->dfs_path) {
- tcon->tc_count++;
- list_add_tail(&tcon->ulist, head);
+ list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+ list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
+ if (tcon->dfs_path) {
+ tcon->tc_count++;
+ list_add_tail(&tcon->ulist, &tcons);
+ }
}
}
- if (ses->tcon_ipc && !ses->tcon_ipc->need_reconnect &&
- ses->tcon_ipc->dfs_path) {
- list_add_tail(&ses->tcon_ipc->ulist, head);
- }
}
spin_unlock(&cifs_tcp_ses_lock);
-}
-
-static bool is_dfs_link(const char *path)
-{
- char *s;
-
- s = strchr(path + 1, '\\');
- if (!s)
- return false;
- return !!strchr(s + 1, '\\');
-}
-
-static char *get_dfs_root(const char *path)
-{
- char *s, *npath;
- s = strchr(path + 1, '\\');
- if (!s)
- return ERR_PTR(-EINVAL);
-
- s = strchr(s + 1, '\\');
- if (!s)
- return ERR_PTR(-EINVAL);
+ list_for_each_entry_safe(tcon, ntcon, &tcons, ulist) {
+ const char *path = tcon->dfs_path + 1;
+ int rc = 0;
- npath = kstrndup(path, s - path, GFP_KERNEL);
- if (!npath)
- return ERR_PTR(-ENOMEM);
-
- return npath;
-}
-
-static inline void put_tcp_server(struct TCP_Server_Info *server)
-{
- cifs_put_tcp_session(server, 0);
-}
-
-static struct TCP_Server_Info *get_tcp_server(struct smb3_fs_context *ctx)
-{
- struct TCP_Server_Info *server;
-
- server = cifs_find_tcp_session(ctx);
- if (IS_ERR_OR_NULL(server))
- return NULL;
-
- spin_lock(&GlobalMid_Lock);
- if (server->tcpStatus != CifsGood) {
- spin_unlock(&GlobalMid_Lock);
- put_tcp_server(server);
- return NULL;
+ list_del_init(&tcon->ulist);
+ ses = find_ipc_from_server_path(sessions, path);
+ if (!IS_ERR(ses)) {
+ xid = get_xid();
+ cache_refresh_path(xid, ses, cache_nlsc, tcon->remap, path);
+ free_xid(xid);
+ }
+ cifs_put_tcon(tcon);
}
- spin_unlock(&GlobalMid_Lock);
-
- return server;
}
-/* Find root SMB session out of a DFS link path */
-static struct cifs_ses *find_root_ses(struct vol_info *vi,
- struct cifs_tcon *tcon,
- const char *path)
+static void refresh_cache(struct cifs_ses **sessions)
{
- char *rpath;
- int rc;
- struct cache_entry *ce;
- struct dfs_info3_param ref = {0};
- char *mdata = NULL, *devname = NULL;
- struct TCP_Server_Info *server;
+ int i;
struct cifs_ses *ses;
- struct smb3_fs_context ctx = {NULL};
-
- rpath = get_dfs_root(path);
- if (IS_ERR(rpath))
- return ERR_CAST(rpath);
-
- down_read(&htable_rw_lock);
-
- ce = lookup_cache_entry(rpath, NULL);
- if (IS_ERR(ce)) {
- up_read(&htable_rw_lock);
- ses = ERR_CAST(ce);
- goto out;
- }
-
- rc = setup_referral(path, ce, &ref, get_tgt_name(ce));
- if (rc) {
- up_read(&htable_rw_lock);
- ses = ERR_PTR(rc);
- goto out;
- }
-
- up_read(&htable_rw_lock);
-
- mdata = cifs_compose_mount_options(vi->mntdata, rpath, &ref,
- &devname);
- free_dfs_info_param(&ref);
-
- if (IS_ERR(mdata)) {
- ses = ERR_CAST(mdata);
- mdata = NULL;
- goto out;
- }
-
- rc = cifs_setup_volume_info(&ctx, NULL, devname);
-
- if (rc) {
- ses = ERR_PTR(rc);
- goto out;
- }
-
- server = get_tcp_server(&ctx);
- if (!server) {
- ses = ERR_PTR(-EHOSTDOWN);
- goto out;
- }
-
- ses = cifs_get_smb_ses(server, &ctx);
-
-out:
- smb3_cleanup_fs_context_contents(&ctx);
- kfree(mdata);
- kfree(rpath);
- kfree(devname);
-
- return ses;
-}
-
-/* Refresh DFS cache entry from a given tcon */
-static int refresh_tcon(struct vol_info *vi, struct cifs_tcon *tcon)
-{
- int rc = 0;
unsigned int xid;
- const char *path, *npath;
- struct cache_entry *ce;
- struct cifs_ses *root_ses = NULL, *ses;
- struct dfs_info3_param *refs = NULL;
- int numrefs = 0;
-
- xid = get_xid();
+ int rc;
- path = tcon->dfs_path + 1;
+ /*
+ * Refresh all cached entries.
+ * The cache entries may cover more paths than the active mounts
+ * (e.g. domain-based DFS referrals or multi tier DFS setups).
+ */
+ down_write(&htable_rw_lock);
+ for (i = 0; i < CACHE_HTABLE_SIZE; i++) {
+ struct cache_entry *ce;
+ struct hlist_head *l = &cache_htable[i];
- rc = get_normalized_path(path, &npath);
- if (rc)
- goto out_free_xid;
+ hlist_for_each_entry(ce, l, hlist) {
+ struct dfs_info3_param *refs = NULL;
+ int numrefs = 0;
- down_read(&htable_rw_lock);
+ if (hlist_unhashed(&ce->hlist) || !cache_entry_expired(ce))
+ continue;
- ce = lookup_cache_entry(npath, NULL);
- if (IS_ERR(ce)) {
- rc = PTR_ERR(ce);
- up_read(&htable_rw_lock);
- goto out_free_path;
- }
+ ses = find_ipc_from_server_path(sessions, ce->path);
+ if (IS_ERR(ses))
+ continue;
- if (!cache_entry_expired(ce)) {
- up_read(&htable_rw_lock);
- goto out_free_path;
- }
+ xid = get_xid();
+ rc = get_dfs_referral(xid, ses, cache_nlsc, NO_MAP_UNI_RSVD, ce->path,
+ &refs, &numrefs);
+ free_xid(xid);
- up_read(&htable_rw_lock);
+ if (!rc)
+ update_cache_entry_locked(ce->path, refs, numrefs);
- /* If it's a DFS Link, then use root SMB session for refreshing it */
- if (is_dfs_link(npath)) {
- ses = root_ses = find_root_ses(vi, tcon, npath);
- if (IS_ERR(ses)) {
- rc = PTR_ERR(ses);
- root_ses = NULL;
- goto out_free_path;
+ free_dfs_info_array(refs, numrefs);
}
- } else {
- ses = tcon->ses;
- }
-
- rc = get_dfs_referral(xid, ses, cache_nlsc, tcon->remap, npath, &refs,
- &numrefs);
- if (!rc) {
- dump_refs(refs, numrefs);
- rc = update_cache_entry(npath, refs, numrefs);
- free_dfs_info_array(refs, numrefs);
}
-
- if (root_ses)
- cifs_put_smb_ses(root_ses);
-
-out_free_path:
- free_normalized_path(path, npath);
-
-out_free_xid:
- free_xid(xid);
- return rc;
+ up_write(&htable_rw_lock);
}
/*
- * Worker that will refresh DFS cache based on lowest TTL value from a DFS
+ * Worker that will refresh DFS cache and active mounts based on lowest TTL value from a DFS
* referral.
*/
static void refresh_cache_worker(struct work_struct *work)
{
- struct vol_info *vi, *nvi;
- struct TCP_Server_Info *server;
- LIST_HEAD(vols);
- LIST_HEAD(tcons);
- struct cifs_tcon *tcon, *ntcon;
- int rc;
-
- /*
- * Find SMB volumes that are eligible (server->tcpStatus == CifsGood)
- * for refreshing.
- */
- spin_lock(&vol_list_lock);
- list_for_each_entry(vi, &vol_list, list) {
- server = get_tcp_server(&vi->ctx);
- if (!server)
- continue;
-
- kref_get(&vi->refcnt);
- list_add_tail(&vi->rlist, &vols);
- put_tcp_server(server);
+ struct list_head mglist;
+ struct mount_group *mg, *tmp_mg;
+ struct cifs_ses *sessions[CACHE_MAX_ENTRIES + 1] = {NULL};
+ int max_sessions = ARRAY_SIZE(sessions) - 1;
+ int i = 0, count;
+
+ INIT_LIST_HEAD(&mglist);
+
+ /* Get refereces of mount groups */
+ mutex_lock(&mount_group_list_lock);
+ list_for_each_entry(mg, &mount_group_list, list) {
+ kref_get(&mg->refcount);
+ list_add(&mg->refresh_list, &mglist);
}
- spin_unlock(&vol_list_lock);
-
- /* Walk through all TCONs and refresh any expired cache entry */
- list_for_each_entry_safe(vi, nvi, &vols, rlist) {
- spin_lock(&vi->ctx_lock);
- server = get_tcp_server(&vi->ctx);
- spin_unlock(&vi->ctx_lock);
+ mutex_unlock(&mount_group_list_lock);
- if (!server)
- goto next_vol;
-
- get_tcons(server, &tcons);
- rc = 0;
-
- list_for_each_entry_safe(tcon, ntcon, &tcons, ulist) {
- /*
- * Skip tcp server if any of its tcons failed to refresh
- * (possibily due to reconnects).
- */
- if (!rc)
- rc = refresh_tcon(vi, tcon);
+ /* Fill in local array with an NULL-terminated list of all referral server sessions */
+ list_for_each_entry(mg, &mglist, refresh_list) {
+ if (i >= max_sessions)
+ break;
- list_del_init(&tcon->ulist);
- cifs_put_tcon(tcon);
- }
+ spin_lock(&mg->lock);
+ if (i + mg->num_sessions > max_sessions)
+ count = max_sessions - i;
+ else
+ count = mg->num_sessions;
+ memcpy(&sessions[i], mg->sessions, count * sizeof(mg->sessions[0]));
+ spin_unlock(&mg->lock);
+ i += count;
+ }
- put_tcp_server(server);
+ if (sessions[0]) {
+ /* Refresh all active mounts and cached entries */
+ refresh_mounts(sessions);
+ refresh_cache(sessions);
+ }
-next_vol:
- list_del_init(&vi->rlist);
- kref_put(&vi->refcnt, vol_release);
+ list_for_each_entry_safe(mg, tmp_mg, &mglist, refresh_list) {
+ list_del_init(&mg->refresh_list);
+ kref_put(&mg->refcount, mount_group_release);
}
spin_lock(&cache_ttl_lock);
projects / users / hch / misc.git / commitdiff