[PATCH v3 04/11] cifs: Clean up DFS referral cache

Paulo Alcantara (SUSE)
2019-11-27T00:37:19Z

Do some renaming and code cleanup.

No functional changes.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
---
fs/cifs/dfs_cache.c | 565 ++++++++++++++++++++++----------------------
1 file changed, 279 insertions(+), 286 deletions(-)

diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index 2faa05860a48..aed4183840c5 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -22,60 +22,59 @@

#include "dfs_cache.h"

-#define DFS_CACHE_HTABLE_SIZE 32
-#define DFS_CACHE_MAX_ENTRIES 64
+#define CACHE_HTABLE_SIZE 32
+#define CACHE_MAX_ENTRIES 64

#define IS_INTERLINK_SET(v) ((v) & (DFSREF_REFERRAL_SERVER | \
DFSREF_STORAGE_SERVER))

-struct dfs_cache_tgt {
- char *t_name;
- struct list_head t_list;
+struct cache_dfs_tgt {
+ char *name;
+ struct list_head list;
};

-struct dfs_cache_entry {
- struct hlist_node ce_hlist;
- const char *ce_path;
- int ce_ttl;
- int ce_srvtype;
- int ce_flags;
- struct timespec64 ce_etime;
- int ce_path_consumed;
- int ce_numtgts;
- struct list_head ce_tlist;
- struct dfs_cache_tgt *ce_tgthint;
- struct rcu_head ce_rcu;
+struct cache_entry {
+ struct hlist_node hlist;
+ const char *path;
+ int ttl;
+ int srvtype;
+ int flags;
+ struct timespec64 etime;
+ int path_consumed;
+ int numtgts;
+ struct list_head tlist;
+ struct cache_dfs_tgt *tgthint;
+ struct rcu_head rcu;
};

-static struct kmem_cache *dfs_cache_slab __read_mostly;
-
-struct dfs_cache_vol_info {
- char *vi_fullpath;
- struct smb_vol vi_vol;
- char *vi_mntdata;
- struct list_head vi_list;
+struct vol_info {
+ char *fullpath;
+ struct smb_vol smb_vol;
+ char *mntdata;
+ struct list_head list;
};

-struct dfs_cache {
- struct mutex dc_lock;
- struct nls_table *dc_nlsc;
- struct list_head dc_vol_list;
- int dc_ttl;
- struct delayed_work dc_refresh;
-};
+static struct kmem_cache *cache_slab __read_mostly;
+static struct workqueue_struct *dfscache_wq __read_mostly;

-static struct dfs_cache dfs_cache;
+static int cache_ttl;
+static struct nls_table *cache_nlsc;

/*
* Number of entries in the cache
*/
-static size_t dfs_cache_count;
+static size_t cache_count;
+
+static struct hlist_head cache_htable[CACHE_HTABLE_SIZE];
+static DEFINE_MUTEX(list_lock);

-static DEFINE_MUTEX(dfs_cache_list_lock);
-static struct hlist_head dfs_cache_htable[DFS_CACHE_HTABLE_SIZE];
+static LIST_HEAD(vol_list);
+static DEFINE_MUTEX(vol_lock);

static void refresh_cache_worker(struct work_struct *work);

+static DECLARE_DELAYED_WORK(refresh_task, refresh_cache_worker);
+
static inline bool is_path_valid(const char *path)
{
return path && (strchr(path + 1, '\\') || strchr(path + 1, '/'));
@@ -100,42 +99,42 @@ static inline void free_normalized_path(const char *path, char *npath)
kfree(npath);
}

-static inline bool cache_entry_expired(const struct dfs_cache_entry *ce)
+static inline bool cache_entry_expired(const struct cache_entry *ce)
{
struct timespec64 ts;

ktime_get_coarse_real_ts64(&ts);
- return timespec64_compare(&ts, &ce->ce_etime) >= 0;
+ return timespec64_compare(&ts, &ce->etime) >= 0;
}

-static inline void free_tgts(struct dfs_cache_entry *ce)
+static inline void free_tgts(struct cache_entry *ce)
{
- struct dfs_cache_tgt *t, *n;
+ struct cache_dfs_tgt *t, *n;

- list_for_each_entry_safe(t, n, &ce->ce_tlist, t_list) {
- list_del(&t->t_list);
- kfree(t->t_name);
+ list_for_each_entry_safe(t, n, &ce->tlist, list) {
+ list_del(&t->list);
+ kfree(t->name);
kfree(t);
}
}

static void free_cache_entry(struct rcu_head *rcu)
{
- struct dfs_cache_entry *ce = container_of(rcu, struct dfs_cache_entry,
- ce_rcu);
- kmem_cache_free(dfs_cache_slab, ce);
+ struct cache_entry *ce = container_of(rcu, struct cache_entry, rcu);
+
+ kmem_cache_free(cache_slab, ce);
}

-static inline void flush_cache_ent(struct dfs_cache_entry *ce)
+static inline void flush_cache_ent(struct cache_entry *ce)
{
- if (hlist_unhashed(&ce->ce_hlist))
+ if (hlist_unhashed(&ce->hlist))
return;

- hlist_del_init_rcu(&ce->ce_hlist);
- kfree_const(ce->ce_path);
+ hlist_del_init_rcu(&ce->hlist);
+ kfree_const(ce->path);
free_tgts(ce);
- dfs_cache_count--;
- call_rcu(&ce->ce_rcu, free_cache_entry);
+ cache_count--;
+ call_rcu(&ce->rcu, free_cache_entry);
}

static void flush_cache_ents(void)
@@ -143,11 +142,11 @@ static void flush_cache_ents(void)
int i;

rcu_read_lock();
- for (i = 0; i < DFS_CACHE_HTABLE_SIZE; i++) {
- struct hlist_head *l = &dfs_cache_htable[i];
- struct dfs_cache_entry *ce;
+ for (i = 0; i < CACHE_HTABLE_SIZE; i++) {
+ struct hlist_head *l = &cache_htable[i];
+ struct cache_entry *ce;

- hlist_for_each_entry_rcu(ce, l, ce_hlist)
+ hlist_for_each_entry_rcu(ce, l, hlist)
flush_cache_ent(ce);
}
rcu_read_unlock();
@@ -159,35 +158,35 @@ static void flush_cache_ents(void)
static int dfscache_proc_show(struct seq_file *m, void *v)
{
int bucket;
- struct dfs_cache_entry *ce;
- struct dfs_cache_tgt *t;
+ struct cache_entry *ce;
+ struct cache_dfs_tgt *t;

seq_puts(m, "DFS cache\n---------\n");

- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);

rcu_read_lock();
- hash_for_each_rcu(dfs_cache_htable, bucket, ce, ce_hlist) {
+ hash_for_each_rcu(cache_htable, bucket, ce, hlist) {
seq_printf(m,
"cache entry: path=%s,type=%s,ttl=%d,etime=%ld,"
"interlink=%s,path_consumed=%d,expired=%s\n",
- ce->ce_path,
- ce->ce_srvtype == DFS_TYPE_ROOT ? "root" : "link",
- ce->ce_ttl, ce->ce_etime.tv_nsec,
- IS_INTERLINK_SET(ce->ce_flags) ? "yes" : "no",
- ce->ce_path_consumed,
+ ce->path,
+ ce->srvtype == DFS_TYPE_ROOT ? "root" : "link",
+ ce->ttl, ce->etime.tv_nsec,
+ IS_INTERLINK_SET(ce->flags) ? "yes" : "no",
+ ce->path_consumed,
cache_entry_expired(ce) ? "yes" : "no");

- list_for_each_entry(t, &ce->ce_tlist, t_list) {
+ list_for_each_entry(t, &ce->tlist, list) {
seq_printf(m, " %s%s\n",
- t->t_name,
- ce->ce_tgthint == t ? " (target hint)" : "");
+ t->name,
+ ce->tgthint == t ? " (target hint)" : "");
}

}
rcu_read_unlock();

- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);
return 0;
}

@@ -205,9 +204,9 @@ static ssize_t dfscache_proc_write(struct file *file, const char __user *buffer,
return -EINVAL;

cifs_dbg(FYI, "clearing dfs cache");
- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);
flush_cache_ents();
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);

return count;
}
@@ -226,25 +225,25 @@ const struct file_operations dfscache_proc_fops = {
};

#ifdef CONFIG_CIFS_DEBUG2
-static inline void dump_tgts(const struct dfs_cache_entry *ce)
+static inline void dump_tgts(const struct cache_entry *ce)
{
- struct dfs_cache_tgt *t;
+ struct cache_dfs_tgt *t;

cifs_dbg(FYI, "target list:\n");
- list_for_each_entry(t, &ce->ce_tlist, t_list) {
- cifs_dbg(FYI, " %s%s\n", t->t_name,
- ce->ce_tgthint == t ? " (target hint)" : "");
+ list_for_each_entry(t, &ce->tlist, list) {
+ cifs_dbg(FYI, " %s%s\n", t->name,
+ ce->tgthint == t ? " (target hint)" : "");
}
}

-static inline void dump_ce(const struct dfs_cache_entry *ce)
+static inline void dump_ce(const struct cache_entry *ce)
{
cifs_dbg(FYI, "cache entry: path=%s,type=%s,ttl=%d,etime=%ld,"
- "interlink=%s,path_consumed=%d,expired=%s\n", ce->ce_path,
- ce->ce_srvtype == DFS_TYPE_ROOT ? "root" : "link", ce->ce_ttl,
- ce->ce_etime.tv_nsec,
- IS_INTERLINK_SET(ce->ce_flags) ? "yes" : "no",
- ce->ce_path_consumed,
+ "interlink=%s,path_consumed=%d,expired=%s\n", ce->path,
+ ce->srvtype == DFS_TYPE_ROOT ? "root" : "link", ce->ttl,
+ ce->etime.tv_nsec,
+ IS_INTERLINK_SET(ce->flags) ? "yes" : "no",
+ ce->path_consumed,
cache_entry_expired(ce) ? "yes" : "no");
dump_tgts(ce);
}
@@ -284,25 +283,34 @@ static inline void dump_refs(const struct dfs_info3_param *refs, int numrefs)
*/
int dfs_cache_init(void)
{
+ int rc;
int i;

- dfs_cache_slab = kmem_cache_create("cifs_dfs_cache",
- sizeof(struct dfs_cache_entry), 0,
- SLAB_HWCACHE_ALIGN, NULL);
- if (!dfs_cache_slab)
+ dfscache_wq = alloc_workqueue("cifs-dfscache",
+ WQ_FREEZABLE | WQ_MEM_RECLAIM, 1);
+ if (!dfscache_wq)
return -ENOMEM;

- for (i = 0; i < DFS_CACHE_HTABLE_SIZE; i++)
- INIT_HLIST_HEAD(&dfs_cache_htable[i]);
+ cache_slab = kmem_cache_create("cifs_dfs_cache",
+ sizeof(struct cache_entry), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!cache_slab) {
+ rc = -ENOMEM;
+ goto out_destroy_wq;
+ }
+
+ for (i = 0; i < CACHE_HTABLE_SIZE; i++)
+ INIT_HLIST_HEAD(&cache_htable[i]);

- INIT_LIST_HEAD(&dfs_cache.dc_vol_list);
- mutex_init(&dfs_cache.dc_lock);
- INIT_DELAYED_WORK(&dfs_cache.dc_refresh, refresh_cache_worker);
- dfs_cache.dc_ttl = -1;
- dfs_cache.dc_nlsc = load_nls_default();
+ cache_ttl = -1;
+ cache_nlsc = load_nls_default();

cifs_dbg(FYI, "%s: initialized DFS referral cache\n", __func__);
return 0;
+
+out_destroy_wq:
+ destroy_workqueue(dfscache_wq);
+ return rc;
}

static inline unsigned int cache_entry_hash(const void *data, int size)
@@ -310,7 +318,7 @@ static inline unsigned int cache_entry_hash(const void *data, int size)
unsigned int h;

h = jhash(data, size, 0);
- return h & (DFS_CACHE_HTABLE_SIZE - 1);
+ return h & (CACHE_HTABLE_SIZE - 1);
}

/* Check whether second path component of @path is SYSVOL or NETLOGON */
@@ -325,11 +333,11 @@ static inline bool is_sysvol_or_netlogon(const char *path)
}

/* Return target hint of a DFS cache entry */
-static inline char *get_tgt_name(const struct dfs_cache_entry *ce)
+static inline char *get_tgt_name(const struct cache_entry *ce)
{
- struct dfs_cache_tgt *t = ce->ce_tgthint;
+ struct cache_dfs_tgt *t = ce->tgthint;

- return t ? t->t_name : ERR_PTR(-ENOENT);
+ return t ? t->name : ERR_PTR(-ENOENT);
}

/* Return expire time out of a new entry's TTL */
@@ -346,19 +354,19 @@ static inline struct timespec64 get_expire_time(int ttl)
}

/* Allocate a new DFS target */
-static inline struct dfs_cache_tgt *alloc_tgt(const char *name)
+static inline struct cache_dfs_tgt *alloc_tgt(const char *name)
{
- struct dfs_cache_tgt *t;
+ struct cache_dfs_tgt *t;

t = kmalloc(sizeof(*t), GFP_KERNEL);
if (!t)
return ERR_PTR(-ENOMEM);
- t->t_name = kstrndup(name, strlen(name), GFP_KERNEL);
- if (!t->t_name) {
+ t->name = kstrndup(name, strlen(name), GFP_KERNEL);
+ if (!t->name) {
kfree(t);
return ERR_PTR(-ENOMEM);
}
- INIT_LIST_HEAD(&t->t_list);
+ INIT_LIST_HEAD(&t->list);
return t;
}

@@ -367,63 +375,63 @@ static inline struct dfs_cache_tgt *alloc_tgt(const char *name)
* target hint.
*/
static int copy_ref_data(const struct dfs_info3_param *refs, int numrefs,
- struct dfs_cache_entry *ce, const char *tgthint)
+ struct cache_entry *ce, const char *tgthint)
{
int i;

- ce->ce_ttl = refs[0].ttl;
- ce->ce_etime = get_expire_time(ce->ce_ttl);
- ce->ce_srvtype = refs[0].server_type;
- ce->ce_flags = refs[0].ref_flag;
- ce->ce_path_consumed = refs[0].path_consumed;
+ ce->ttl = refs[0].ttl;
+ ce->etime = get_expire_time(ce->ttl);
+ ce->srvtype = refs[0].server_type;
+ ce->flags = refs[0].ref_flag;
+ ce->path_consumed = refs[0].path_consumed;

for (i = 0; i < numrefs; i++) {
- struct dfs_cache_tgt *t;
+ struct cache_dfs_tgt *t;

t = alloc_tgt(refs[i].node_name);
if (IS_ERR(t)) {
free_tgts(ce);
return PTR_ERR(t);
}
- if (tgthint && !strcasecmp(t->t_name, tgthint)) {
- list_add(&t->t_list, &ce->ce_tlist);
+ if (tgthint && !strcasecmp(t->name, tgthint)) {
+ list_add(&t->list, &ce->tlist);
tgthint = NULL;
} else {
- list_add_tail(&t->t_list, &ce->ce_tlist);
+ list_add_tail(&t->list, &ce->tlist);
}
- ce->ce_numtgts++;
+ ce->numtgts++;
}

- ce->ce_tgthint = list_first_entry_or_null(&ce->ce_tlist,
- struct dfs_cache_tgt, t_list);
+ ce->tgthint = list_first_entry_or_null(&ce->tlist,
+ struct cache_dfs_tgt, list);

return 0;
}

/* Allocate a new cache entry */
-static struct dfs_cache_entry *
-alloc_cache_entry(const char *path, const struct dfs_info3_param *refs,
- int numrefs)
+static struct cache_entry *alloc_cache_entry(const char *path,
+ const struct dfs_info3_param *refs,
+ int numrefs)
{
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;
int rc;

- ce = kmem_cache_zalloc(dfs_cache_slab, GFP_KERNEL);
+ ce = kmem_cache_zalloc(cache_slab, GFP_KERNEL);
if (!ce)
return ERR_PTR(-ENOMEM);

- ce->ce_path = kstrdup_const(path, GFP_KERNEL);
- if (!ce->ce_path) {
- kmem_cache_free(dfs_cache_slab, ce);
+ ce->path = kstrdup_const(path, GFP_KERNEL);
+ if (!ce->path) {
+ kmem_cache_free(cache_slab, ce);
return ERR_PTR(-ENOMEM);
}
- INIT_HLIST_NODE(&ce->ce_hlist);
- INIT_LIST_HEAD(&ce->ce_tlist);
+ INIT_HLIST_NODE(&ce->hlist);
+ INIT_LIST_HEAD(&ce->tlist);

rc = copy_ref_data(refs, numrefs, ce, NULL);
if (rc) {
- kfree_const(ce->ce_path);
- kmem_cache_free(dfs_cache_slab, ce);
+ kfree_const(ce->path);
+ kmem_cache_free(cache_slab, ce);
ce = ERR_PTR(rc);
}
return ce;
@@ -432,13 +440,13 @@ alloc_cache_entry(const char *path, const struct dfs_info3_param *refs,
static void remove_oldest_entry(void)
{
int bucket;
- struct dfs_cache_entry *ce;
- struct dfs_cache_entry *to_del = NULL;
+ struct cache_entry *ce;
+ struct cache_entry *to_del = NULL;

rcu_read_lock();
- hash_for_each_rcu(dfs_cache_htable, bucket, ce, ce_hlist) {
- if (!to_del || timespec64_compare(&ce->ce_etime,
- &to_del->ce_etime) < 0)
+ hash_for_each_rcu(cache_htable, bucket, ce, hlist) {
+ if (!to_del || timespec64_compare(&ce->etime,
+ &to_del->etime) < 0)
to_del = ce;
}
if (!to_del) {
@@ -453,93 +461,84 @@ static void remove_oldest_entry(void)
}

/* Add a new DFS cache entry */
-static inline struct dfs_cache_entry *
+static inline struct cache_entry *
add_cache_entry(unsigned int hash, const char *path,
const struct dfs_info3_param *refs, int numrefs)
{
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;

ce = alloc_cache_entry(path, refs, numrefs);
if (IS_ERR(ce))
return ce;

- hlist_add_head_rcu(&ce->ce_hlist, &dfs_cache_htable[hash]);
+ hlist_add_head_rcu(&ce->hlist, &cache_htable[hash]);

- mutex_lock(&dfs_cache.dc_lock);
- if (dfs_cache.dc_ttl < 0) {
- dfs_cache.dc_ttl = ce->ce_ttl;
- queue_delayed_work(cifsiod_wq, &dfs_cache.dc_refresh,
- dfs_cache.dc_ttl * HZ);
+ mutex_lock(&vol_lock);
+ if (cache_ttl < 0) {
+ cache_ttl = ce->ttl;
+ queue_delayed_work(dfscache_wq, &refresh_task, cache_ttl * HZ);
} else {
- dfs_cache.dc_ttl = min_t(int, dfs_cache.dc_ttl, ce->ce_ttl);
- mod_delayed_work(cifsiod_wq, &dfs_cache.dc_refresh,
- dfs_cache.dc_ttl * HZ);
+ cache_ttl = min_t(int, cache_ttl, ce->ttl);
+ mod_delayed_work(dfscache_wq, &refresh_task, cache_ttl * HZ);
}
- mutex_unlock(&dfs_cache.dc_lock);
+ mutex_unlock(&vol_lock);

return ce;
}

-static struct dfs_cache_entry *__find_cache_entry(unsigned int hash,
- const char *path)
+/*
+ * Find a DFS cache entry in hash table and optionally check prefix path against
+ * @path.
+ * Use whole path components in the match.
+ * Return ERR_PTR(-ENOENT) if the entry is not found.
+ */
+static struct cache_entry *lookup_cache_entry(const char *path,
+ unsigned int *hash)
{
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;
+ unsigned int h;
bool found = false;

- rcu_read_lock();
- hlist_for_each_entry_rcu(ce, &dfs_cache_htable[hash], ce_hlist) {
- if (!strcasecmp(path, ce->ce_path)) {
-#ifdef CONFIG_CIFS_DEBUG2
- char *name = get_tgt_name(ce);
+ h = cache_entry_hash(path, strlen(path));

- if (IS_ERR(name)) {
- rcu_read_unlock();
- return ERR_CAST(name);
- }
- cifs_dbg(FYI, "%s: cache hit\n", __func__);
- cifs_dbg(FYI, "%s: target hint: %s\n", __func__, name);
-#endif
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(ce, &cache_htable[h], hlist) {
+ if (!strcasecmp(path, ce->path)) {
found = true;
+ dump_ce(ce);
break;
}
}
rcu_read_unlock();
- return found ? ce : ERR_PTR(-ENOENT);
-}

-/*
- * Find a DFS cache entry in hash table and optionally check prefix path against
- * @path.
- * Use whole path components in the match.
- * Return ERR_PTR(-ENOENT) if the entry is not found.
- */
-static inline struct dfs_cache_entry *find_cache_entry(const char *path,
- unsigned int *hash)
-{
- *hash = cache_entry_hash(path, strlen(path));
- return __find_cache_entry(*hash, path);
+ if (!found)
+ ce = ERR_PTR(-ENOENT);
+ if (hash)
+ *hash = h;
+
+ return ce;
}

static inline void destroy_slab_cache(void)
{
rcu_barrier();
- kmem_cache_destroy(dfs_cache_slab);
+ kmem_cache_destroy(cache_slab);
}

-static inline void free_vol(struct dfs_cache_vol_info *vi)
+static inline void free_vol(struct vol_info *vi)
{
- list_del(&vi->vi_list);
- kfree(vi->vi_fullpath);
- kfree(vi->vi_mntdata);
- cifs_cleanup_volume_info_contents(&vi->vi_vol);
+ list_del(&vi->list);
+ kfree(vi->fullpath);
+ kfree(vi->mntdata);
+ cifs_cleanup_volume_info_contents(&vi->smb_vol);
kfree(vi);
}

static inline void free_vol_list(void)
{
- struct dfs_cache_vol_info *vi, *nvi;
+ struct vol_info *vi, *nvi;

- list_for_each_entry_safe(vi, nvi, &dfs_cache.dc_vol_list, vi_list)
+ list_for_each_entry_safe(vi, nvi, &vol_list, list)
free_vol(vi);
}

@@ -548,40 +547,38 @@ static inline void free_vol_list(void)
*/
void dfs_cache_destroy(void)
{
- cancel_delayed_work_sync(&dfs_cache.dc_refresh);
- unload_nls(dfs_cache.dc_nlsc);
+ cancel_delayed_work_sync(&refresh_task);
+ unload_nls(cache_nlsc);
free_vol_list();
- mutex_destroy(&dfs_cache.dc_lock);
-
flush_cache_ents();
destroy_slab_cache();
- mutex_destroy(&dfs_cache_list_lock);
+ destroy_workqueue(dfscache_wq);

cifs_dbg(FYI, "%s: destroyed DFS referral cache\n", __func__);
}

-static inline struct dfs_cache_entry *
+static inline struct cache_entry *
__update_cache_entry(const char *path, const struct dfs_info3_param *refs,
int numrefs)
{
int rc;
unsigned int h;
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;
char *s, *th = NULL;

- ce = find_cache_entry(path, &h);
+ ce = lookup_cache_entry(path, &h);
if (IS_ERR(ce))
return ce;

- if (ce->ce_tgthint) {
- s = ce->ce_tgthint->t_name;
+ if (ce->tgthint) {
+ s = ce->tgthint->name;
th = kstrndup(s, strlen(s), GFP_KERNEL);
if (!th)
return ERR_PTR(-ENOMEM);
}

free_tgts(ce);
- ce->ce_numtgts = 0;
+ ce->numtgts = 0;

rc = copy_ref_data(refs, numrefs, ce, th);
kfree(th);
@@ -593,10 +590,10 @@ __update_cache_entry(const char *path, const struct dfs_info3_param *refs,
}

/* Update an expired cache entry by getting a new DFS referral from server */
-static struct dfs_cache_entry *
+static struct cache_entry *
update_cache_entry(const unsigned int xid, struct cifs_ses *ses,
const struct nls_table *nls_codepage, int remap,
- const char *path, struct dfs_cache_entry *ce)
+ const char *path, struct cache_entry *ce)
{
int rc;
struct dfs_info3_param *refs = NULL;
@@ -636,20 +633,20 @@ update_cache_entry(const unsigned int xid, struct cifs_ses *ses,
* For interlinks, __cifs_dfs_mount() and expand_dfs_referral() are supposed to
* handle them properly.
*/
-static struct dfs_cache_entry *
+static struct cache_entry *
do_dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
const struct nls_table *nls_codepage, int remap,
const char *path, bool noreq)
{
int rc;
unsigned int h;
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;
struct dfs_info3_param *nrefs;
int numnrefs;

cifs_dbg(FYI, "%s: search path: %s\n", __func__, path);

- ce = find_cache_entry(path, &h);
+ ce = lookup_cache_entry(path, &h);
if (IS_ERR(ce)) {
cifs_dbg(FYI, "%s: cache miss\n", __func__);
/*
@@ -690,9 +687,9 @@ do_dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,

cifs_dbg(FYI, "%s: new cache entry\n", __func__);

- if (dfs_cache_count >= DFS_CACHE_MAX_ENTRIES) {
+ if (cache_count >= CACHE_MAX_ENTRIES) {
cifs_dbg(FYI, "%s: reached max cache size (%d)",
- __func__, DFS_CACHE_MAX_ENTRIES);
+ __func__, CACHE_MAX_ENTRIES);
remove_oldest_entry();
}
ce = add_cache_entry(h, path, nrefs, numnrefs);
@@ -701,7 +698,7 @@ do_dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
if (IS_ERR(ce))
return ce;

- dfs_cache_count++;
+ cache_count++;
}

dump_ce(ce);
@@ -723,7 +720,7 @@ do_dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
}

/* Set up a new DFS referral from a given cache entry */
-static int setup_ref(const char *path, const struct dfs_cache_entry *ce,
+static int setup_ref(const char *path, const struct cache_entry *ce,
struct dfs_info3_param *ref, const char *tgt)
{
int rc;
@@ -736,7 +733,7 @@ static int setup_ref(const char *path, const struct dfs_cache_entry *ce,
if (!ref->path_name)
return -ENOMEM;

- ref->path_consumed = ce->ce_path_consumed;
+ ref->path_consumed = ce->path_consumed;

ref->node_name = kstrndup(tgt, strlen(tgt), GFP_KERNEL);
if (!ref->node_name) {
@@ -744,9 +741,9 @@ static int setup_ref(const char *path, const struct dfs_cache_entry *ce,
goto err_free_path;
}

- ref->ttl = ce->ce_ttl;
- ref->server_type = ce->ce_srvtype;
- ref->ref_flag = ce->ce_flags;
+ ref->ttl = ce->ttl;
+ ref->server_type = ce->srvtype;
+ ref->ref_flag = ce->flags;

return 0;

@@ -757,25 +754,25 @@ static int setup_ref(const char *path, const struct dfs_cache_entry *ce,
}

/* Return target list of a DFS cache entry */
-static int get_tgt_list(const struct dfs_cache_entry *ce,
+static int get_tgt_list(const struct cache_entry *ce,
struct dfs_cache_tgt_list *tl)
{
int rc;
struct list_head *head = &tl->tl_list;
- struct dfs_cache_tgt *t;
+ struct cache_dfs_tgt *t;
struct dfs_cache_tgt_iterator *it, *nit;

memset(tl, 0, sizeof(*tl));
INIT_LIST_HEAD(head);

- list_for_each_entry(t, &ce->ce_tlist, t_list) {
+ list_for_each_entry(t, &ce->tlist, list) {
it = kzalloc(sizeof(*it), GFP_KERNEL);
if (!it) {
rc = -ENOMEM;
goto err_free_it;
}

- it->it_name = kstrndup(t->t_name, strlen(t->t_name),
+ it->it_name = kstrndup(t->name, strlen(t->name),
GFP_KERNEL);
if (!it->it_name) {
kfree(it);
@@ -783,12 +780,12 @@ static int get_tgt_list(const struct dfs_cache_entry *ce,
goto err_free_it;
}

- if (ce->ce_tgthint == t)
+ if (ce->tgthint == t)
list_add(&it->it_list, head);
else
list_add_tail(&it->it_list, head);
}
- tl->tl_numtgts = ce->ce_numtgts;
+ tl->tl_numtgts = ce->numtgts;

return 0;

@@ -829,7 +826,7 @@ int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
{
int rc;
char *npath;
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;

if (unlikely(!is_path_valid(path)))
return -EINVAL;
@@ -838,7 +835,7 @@ int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
if (rc)
return rc;

- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);
ce = do_dfs_cache_find(xid, ses, nls_codepage, remap, npath, false);
if (!IS_ERR(ce)) {
if (ref)
@@ -850,7 +847,7 @@ int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
} else {
rc = PTR_ERR(ce);
}
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);
free_normalized_path(path, npath);
return rc;
}
@@ -876,7 +873,7 @@ int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
{
int rc;
char *npath;
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;

if (unlikely(!is_path_valid(path)))
return -EINVAL;
@@ -885,7 +882,7 @@ int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
if (rc)
return rc;

- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);
ce = do_dfs_cache_find(0, NULL, NULL, 0, npath, true);
if (IS_ERR(ce)) {
rc = PTR_ERR(ce);
@@ -899,7 +896,7 @@ int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
if (!rc && tgt_list)
rc = get_tgt_list(ce, tgt_list);
out:
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);
free_normalized_path(path, npath);
return rc;
}
@@ -929,8 +926,8 @@ int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,
{
int rc;
char *npath;
- struct dfs_cache_entry *ce;
- struct dfs_cache_tgt *t;
+ struct cache_entry *ce;
+ struct cache_dfs_tgt *t;

if (unlikely(!is_path_valid(path)))
return -EINVAL;
@@ -941,7 +938,7 @@ int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,

cifs_dbg(FYI, "%s: path: %s\n", __func__, npath);

- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);
ce = do_dfs_cache_find(xid, ses, nls_codepage, remap, npath, false);
if (IS_ERR(ce)) {
rc = PTR_ERR(ce);
@@ -950,14 +947,14 @@ int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,

rc = 0;

- t = ce->ce_tgthint;
+ t = ce->tgthint;

- if (likely(!strcasecmp(it->it_name, t->t_name)))
+ if (likely(!strcasecmp(it->it_name, t->name)))
goto out;

- list_for_each_entry(t, &ce->ce_tlist, t_list) {
- if (!strcasecmp(t->t_name, it->it_name)) {
- ce->ce_tgthint = t;
+ list_for_each_entry(t, &ce->tlist, list) {
+ if (!strcasecmp(t->name, it->it_name)) {
+ ce->tgthint = t;
cifs_dbg(FYI, "%s: new target hint: %s\n", __func__,
it->it_name);
break;
@@ -965,7 +962,7 @@ int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,
}

out:
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);
free_normalized_path(path, npath);
return rc;
}
@@ -989,8 +986,8 @@ int dfs_cache_noreq_update_tgthint(const char *path,
{
int rc;
char *npath;
- struct dfs_cache_entry *ce;
- struct dfs_cache_tgt *t;
+ struct cache_entry *ce;
+ struct cache_dfs_tgt *t;

if (unlikely(!is_path_valid(path)) || !it)
return -EINVAL;
@@ -1001,7 +998,7 @@ int dfs_cache_noreq_update_tgthint(const char *path,

cifs_dbg(FYI, "%s: path: %s\n", __func__, npath);

- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);

ce = do_dfs_cache_find(0, NULL, NULL, 0, npath, true);
if (IS_ERR(ce)) {
@@ -1011,14 +1008,14 @@ int dfs_cache_noreq_update_tgthint(const char *path,

rc = 0;

- t = ce->ce_tgthint;
+ t = ce->tgthint;

- if (unlikely(!strcasecmp(it->it_name, t->t_name)))
+ if (unlikely(!strcasecmp(it->it_name, t->name)))
goto out;

- list_for_each_entry(t, &ce->ce_tlist, t_list) {
- if (!strcasecmp(t->t_name, it->it_name)) {
- ce->ce_tgthint = t;
+ list_for_each_entry(t, &ce->tlist, list) {
+ if (!strcasecmp(t->name, it->it_name)) {
+ ce->tgthint = t;
cifs_dbg(FYI, "%s: new target hint: %s\n", __func__,
it->it_name);
break;
@@ -1026,7 +1023,7 @@ int dfs_cache_noreq_update_tgthint(const char *path,
}

out:
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);
free_normalized_path(path, npath);
return rc;
}
@@ -1047,7 +1044,7 @@ int dfs_cache_get_tgt_referral(const char *path,
{
int rc;
char *npath;
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;
unsigned int h;

if (!it || !ref)
@@ -1061,9 +1058,9 @@ int dfs_cache_get_tgt_referral(const char *path,

cifs_dbg(FYI, "%s: path: %s\n", __func__, npath);

- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);

- ce = find_cache_entry(npath, &h);
+ ce = lookup_cache_entry(npath, &h);
if (IS_ERR(ce)) {
rc = PTR_ERR(ce);
goto out;
@@ -1074,7 +1071,7 @@ int dfs_cache_get_tgt_referral(const char *path,
rc = setup_ref(path, ce, ref, it->it_name);

out:
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);
free_normalized_path(path, npath);
return rc;
}
@@ -1085,7 +1082,7 @@ static int dup_vol(struct smb_vol *vol, struct smb_vol *new)

if (vol->username) {
new->username = kstrndup(vol->username, strlen(vol->username),
- GFP_KERNEL);
+ GFP_KERNEL);
if (!new->username)
return -ENOMEM;
}
@@ -1103,7 +1100,7 @@ static int dup_vol(struct smb_vol *vol, struct smb_vol *new)
}
if (vol->domainname) {
new->domainname = kstrndup(vol->domainname,
- strlen(vol->domainname), GFP_KERNEL);
+ strlen(vol->domainname), GFP_KERNEL);
if (!new->domainname)
goto err_free_unc;
}
@@ -1150,7 +1147,7 @@ static int dup_vol(struct smb_vol *vol, struct smb_vol *new)
int dfs_cache_add_vol(char *mntdata, struct smb_vol *vol, const char *fullpath)
{
int rc;
- struct dfs_cache_vol_info *vi;
+ struct vol_info *vi;

if (!vol || !fullpath || !mntdata)
return -EINVAL;
@@ -1161,38 +1158,37 @@ int dfs_cache_add_vol(char *mntdata, struct smb_vol *vol, const char *fullpath)
if (!vi)
return -ENOMEM;

- vi->vi_fullpath = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
- if (!vi->vi_fullpath) {
+ vi->fullpath = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
+ if (!vi->fullpath) {
rc = -ENOMEM;
goto err_free_vi;
}

- rc = dup_vol(vol, &vi->vi_vol);
+ rc = dup_vol(vol, &vi->smb_vol);
if (rc)
goto err_free_fullpath;

- vi->vi_mntdata = mntdata;
+ vi->mntdata = mntdata;

- mutex_lock(&dfs_cache.dc_lock);
- list_add_tail(&vi->vi_list, &dfs_cache.dc_vol_list);
- mutex_unlock(&dfs_cache.dc_lock);
+ mutex_lock(&vol_lock);
+ list_add_tail(&vi->list, &vol_list);
+ mutex_unlock(&vol_lock);
return 0;

err_free_fullpath:
- kfree(vi->vi_fullpath);
+ kfree(vi->fullpath);
err_free_vi:
kfree(vi);
return rc;
}

-static inline struct dfs_cache_vol_info *find_vol(const char *fullpath)
+static inline struct vol_info *find_vol(const char *fullpath)
{
- struct dfs_cache_vol_info *vi;
+ struct vol_info *vi;

- list_for_each_entry(vi, &dfs_cache.dc_vol_list, vi_list) {
- cifs_dbg(FYI, "%s: vi->vi_fullpath: %s\n", __func__,
- vi->vi_fullpath);
- if (!strcasecmp(vi->vi_fullpath, fullpath))
+ 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);
@@ -1209,14 +1205,14 @@ static inline struct dfs_cache_vol_info *find_vol(const char *fullpath)
int dfs_cache_update_vol(const char *fullpath, struct TCP_Server_Info *server)
{
int rc;
- struct dfs_cache_vol_info *vi;
+ struct vol_info *vi;

if (!fullpath || !server)
return -EINVAL;

cifs_dbg(FYI, "%s: fullpath: %s\n", __func__, fullpath);

- mutex_lock(&dfs_cache.dc_lock);
+ mutex_lock(&vol_lock);

vi = find_vol(fullpath);
if (IS_ERR(vi)) {
@@ -1225,12 +1221,12 @@ int dfs_cache_update_vol(const char *fullpath, struct TCP_Server_Info *server)
}

cifs_dbg(FYI, "%s: updating volume info\n", __func__);
- memcpy(&vi->vi_vol.dstaddr, &server->dstaddr,
- sizeof(vi->vi_vol.dstaddr));
+ memcpy(&vi->smb_vol.dstaddr, &server->dstaddr,
+ sizeof(vi->smb_vol.dstaddr));
rc = 0;

out:
- mutex_unlock(&dfs_cache.dc_lock);
+ mutex_unlock(&vol_lock);
return rc;
}

@@ -1241,18 +1237,18 @@ int dfs_cache_update_vol(const char *fullpath, struct TCP_Server_Info *server)
*/
void dfs_cache_del_vol(const char *fullpath)
{
- struct dfs_cache_vol_info *vi;
+ struct vol_info *vi;

if (!fullpath || !*fullpath)
return;

cifs_dbg(FYI, "%s: fullpath: %s\n", __func__, fullpath);

- mutex_lock(&dfs_cache.dc_lock);
+ mutex_lock(&vol_lock);
vi = find_vol(fullpath);
if (!IS_ERR(vi))
free_vol(vi);
- mutex_unlock(&dfs_cache.dc_lock);
+ mutex_unlock(&vol_lock);
}

/* Get all tcons that are within a DFS namespace and can be refreshed */
@@ -1280,7 +1276,7 @@ static void get_tcons(struct TCP_Server_Info *server, struct list_head *head)
spin_unlock(&cifs_tcp_ses_lock);
}

-static inline bool is_dfs_link(const char *path)
+static bool is_dfs_link(const char *path)
{
char *s;

@@ -1290,7 +1286,7 @@ static inline bool is_dfs_link(const char *path)
return !!strchr(s + 1, '\\');
}

-static inline char *get_dfs_root(const char *path)
+static char *get_dfs_root(const char *path)
{
char *s, *npath;

@@ -1310,8 +1306,9 @@ static inline char *get_dfs_root(const char *path)
}

/* Find root SMB session out of a DFS link path */
-static struct cifs_ses *find_root_ses(struct dfs_cache_vol_info *vi,
- struct cifs_tcon *tcon, const char *path)
+static struct cifs_ses *find_root_ses(struct vol_info *vi,
+ struct cifs_tcon *tcon,
+ const char *path)
{
char *rpath;
int rc;
@@ -1333,8 +1330,7 @@ static struct cifs_ses *find_root_ses(struct dfs_cache_vol_info *vi,
goto out;
}

- mdata = cifs_compose_mount_options(vi->vi_mntdata, rpath, &ref,
- &devname);
+ mdata = cifs_compose_mount_options(vi->mntdata, rpath, &ref, &devname);
free_dfs_info_param(&ref);

if (IS_ERR(mdata)) {
@@ -1373,14 +1369,13 @@ static struct cifs_ses *find_root_ses(struct dfs_cache_vol_info *vi,
}

/* Refresh DFS cache entry from a given tcon */
-static void do_refresh_tcon(struct dfs_cache *dc, struct dfs_cache_vol_info *vi,
- struct cifs_tcon *tcon)
+static void refresh_tcon(struct vol_info *vi, struct cifs_tcon *tcon)
{
int rc = 0;
unsigned int xid;
char *path, *npath;
unsigned int h;
- struct dfs_cache_entry *ce;
+ struct cache_entry *ce;
struct dfs_info3_param *refs = NULL;
int numrefs = 0;
struct cifs_ses *root_ses = NULL, *ses;
@@ -1393,9 +1388,9 @@ static void do_refresh_tcon(struct dfs_cache *dc, struct dfs_cache_vol_info *vi,
if (rc)
goto out;

- mutex_lock(&dfs_cache_list_lock);
- ce = find_cache_entry(npath, &h);
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);
+ ce = lookup_cache_entry(npath, &h);
+ mutex_unlock(&list_lock);

if (IS_ERR(ce)) {
rc = PTR_ERR(ce);
@@ -1421,12 +1416,12 @@ static void do_refresh_tcon(struct dfs_cache *dc, struct dfs_cache_vol_info *vi,
rc = -EOPNOTSUPP;
} else {
rc = ses->server->ops->get_dfs_refer(xid, ses, path, &refs,
- &numrefs, dc->dc_nlsc,
+ &numrefs, cache_nlsc,
tcon->remap);
if (!rc) {
- mutex_lock(&dfs_cache_list_lock);
+ mutex_lock(&list_lock);
ce = __update_cache_entry(npath, refs, numrefs);
- mutex_unlock(&dfs_cache_list_lock);
+ mutex_unlock(&list_lock);
dump_refs(refs, numrefs);
free_dfs_info_array(refs, numrefs);
if (IS_ERR(ce))
@@ -1448,30 +1443,28 @@ static void do_refresh_tcon(struct dfs_cache *dc, struct dfs_cache_vol_info *vi,
*/
static void refresh_cache_worker(struct work_struct *work)
{
- struct dfs_cache *dc = container_of(work, struct dfs_cache,
- dc_refresh.work);
- struct dfs_cache_vol_info *vi;
+ struct vol_info *vi;
struct TCP_Server_Info *server;
LIST_HEAD(list);
struct cifs_tcon *tcon, *ntcon;

- mutex_lock(&dc->dc_lock);
+ mutex_lock(&vol_lock);

- list_for_each_entry(vi, &dc->dc_vol_list, vi_list) {
- server = cifs_find_tcp_session(&vi->vi_vol);
+ list_for_each_entry(vi, &vol_list, list) {
+ server = cifs_find_tcp_session(&vi->smb_vol);
if (IS_ERR_OR_NULL(server))
continue;
if (server->tcpStatus != CifsGood)
goto next;
get_tcons(server, &list);
list_for_each_entry_safe(tcon, ntcon, &list, ulist) {
- do_refresh_tcon(dc, vi, tcon);
+ refresh_tcon(vi, tcon);
list_del_init(&tcon->ulist);
cifs_put_tcon(tcon);
}
next:
cifs_put_tcp_session(server, 0);
}
- queue_delayed_work(cifsiod_wq, &dc->dc_refresh, dc->dc_ttl * HZ);
- mutex_unlock(&dc->dc_lock);
+ queue_delayed_work(dfscache_wq, &refresh_task, cache_ttl * HZ);
+ mutex_unlock(&vol_lock);
}
--
2.24.0