1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
4 * Copyright (C) 2019 Samsung Electronics Co., Ltd.
8 #include <linux/filelock.h>
9 #include <linux/slab.h>
10 #include <linux/vmalloc.h>
13 #include "vfs_cache.h"
16 #include "connection.h"
17 #include "mgmt/tree_connect.h"
18 #include "mgmt/user_session.h"
19 #include "smb_common.h"
21 #define S_DEL_PENDING 1
22 #define S_DEL_ON_CLS 2
23 #define S_DEL_ON_CLS_STREAM 8
25 static unsigned int inode_hash_mask __read_mostly
;
26 static unsigned int inode_hash_shift __read_mostly
;
27 static struct hlist_head
*inode_hashtable __read_mostly
;
28 static DEFINE_RWLOCK(inode_hash_lock
);
30 static struct ksmbd_file_table global_ft
;
31 static atomic_long_t fd_limit
;
32 static struct kmem_cache
*filp_cache
;
34 void ksmbd_set_fd_limit(unsigned long limit
)
36 limit
= min(limit
, get_max_files());
37 atomic_long_set(&fd_limit
, limit
);
40 static bool fd_limit_depleted(void)
42 long v
= atomic_long_dec_return(&fd_limit
);
46 atomic_long_inc(&fd_limit
);
50 static void fd_limit_close(void)
52 atomic_long_inc(&fd_limit
);
59 static unsigned long inode_hash(struct super_block
*sb
, unsigned long hashval
)
63 tmp
= (hashval
* (unsigned long)sb
) ^ (GOLDEN_RATIO_PRIME
+ hashval
) /
65 tmp
= tmp
^ ((tmp
^ GOLDEN_RATIO_PRIME
) >> inode_hash_shift
);
66 return tmp
& inode_hash_mask
;
69 static struct ksmbd_inode
*__ksmbd_inode_lookup(struct inode
*inode
)
71 struct hlist_head
*head
= inode_hashtable
+
72 inode_hash(inode
->i_sb
, inode
->i_ino
);
73 struct ksmbd_inode
*ci
= NULL
, *ret_ci
= NULL
;
75 hlist_for_each_entry(ci
, head
, m_hash
) {
76 if (ci
->m_inode
== inode
) {
77 if (atomic_inc_not_zero(&ci
->m_count
))
85 static struct ksmbd_inode
*ksmbd_inode_lookup(struct ksmbd_file
*fp
)
87 return __ksmbd_inode_lookup(file_inode(fp
->filp
));
90 static struct ksmbd_inode
*ksmbd_inode_lookup_by_vfsinode(struct inode
*inode
)
92 struct ksmbd_inode
*ci
;
94 read_lock(&inode_hash_lock
);
95 ci
= __ksmbd_inode_lookup(inode
);
96 read_unlock(&inode_hash_lock
);
100 int ksmbd_query_inode_status(struct inode
*inode
)
102 struct ksmbd_inode
*ci
;
103 int ret
= KSMBD_INODE_STATUS_UNKNOWN
;
105 read_lock(&inode_hash_lock
);
106 ci
= __ksmbd_inode_lookup(inode
);
108 ret
= KSMBD_INODE_STATUS_OK
;
109 if (ci
->m_flags
& S_DEL_PENDING
)
110 ret
= KSMBD_INODE_STATUS_PENDING_DELETE
;
111 atomic_dec(&ci
->m_count
);
113 read_unlock(&inode_hash_lock
);
117 bool ksmbd_inode_pending_delete(struct ksmbd_file
*fp
)
119 return (fp
->f_ci
->m_flags
& S_DEL_PENDING
);
122 void ksmbd_set_inode_pending_delete(struct ksmbd_file
*fp
)
124 fp
->f_ci
->m_flags
|= S_DEL_PENDING
;
127 void ksmbd_clear_inode_pending_delete(struct ksmbd_file
*fp
)
129 fp
->f_ci
->m_flags
&= ~S_DEL_PENDING
;
132 void ksmbd_fd_set_delete_on_close(struct ksmbd_file
*fp
,
135 if (ksmbd_stream_fd(fp
)) {
136 fp
->f_ci
->m_flags
|= S_DEL_ON_CLS_STREAM
;
140 fp
->f_ci
->m_flags
|= S_DEL_ON_CLS
;
143 static void ksmbd_inode_hash(struct ksmbd_inode
*ci
)
145 struct hlist_head
*b
= inode_hashtable
+
146 inode_hash(ci
->m_inode
->i_sb
, ci
->m_inode
->i_ino
);
148 hlist_add_head(&ci
->m_hash
, b
);
151 static void ksmbd_inode_unhash(struct ksmbd_inode
*ci
)
153 write_lock(&inode_hash_lock
);
154 hlist_del_init(&ci
->m_hash
);
155 write_unlock(&inode_hash_lock
);
158 static int ksmbd_inode_init(struct ksmbd_inode
*ci
, struct ksmbd_file
*fp
)
160 ci
->m_inode
= file_inode(fp
->filp
);
161 atomic_set(&ci
->m_count
, 1);
162 atomic_set(&ci
->op_count
, 0);
163 atomic_set(&ci
->sop_count
, 0);
166 INIT_LIST_HEAD(&ci
->m_fp_list
);
167 INIT_LIST_HEAD(&ci
->m_op_list
);
168 rwlock_init(&ci
->m_lock
);
172 static struct ksmbd_inode
*ksmbd_inode_get(struct ksmbd_file
*fp
)
174 struct ksmbd_inode
*ci
, *tmpci
;
177 read_lock(&inode_hash_lock
);
178 ci
= ksmbd_inode_lookup(fp
);
179 read_unlock(&inode_hash_lock
);
183 ci
= kmalloc(sizeof(struct ksmbd_inode
), GFP_KERNEL
);
187 rc
= ksmbd_inode_init(ci
, fp
);
189 pr_err("inode initialized failed\n");
194 write_lock(&inode_hash_lock
);
195 tmpci
= ksmbd_inode_lookup(fp
);
197 ksmbd_inode_hash(ci
);
202 write_unlock(&inode_hash_lock
);
206 static void ksmbd_inode_free(struct ksmbd_inode
*ci
)
208 ksmbd_inode_unhash(ci
);
212 static void ksmbd_inode_put(struct ksmbd_inode
*ci
)
214 if (atomic_dec_and_test(&ci
->m_count
))
215 ksmbd_inode_free(ci
);
218 int __init
ksmbd_inode_hash_init(void)
221 unsigned long numentries
= 16384;
222 unsigned long bucketsize
= sizeof(struct hlist_head
);
225 inode_hash_shift
= ilog2(numentries
);
226 inode_hash_mask
= (1 << inode_hash_shift
) - 1;
228 size
= bucketsize
<< inode_hash_shift
;
230 /* init master fp hash table */
231 inode_hashtable
= vmalloc(size
);
232 if (!inode_hashtable
)
235 for (loop
= 0; loop
< (1U << inode_hash_shift
); loop
++)
236 INIT_HLIST_HEAD(&inode_hashtable
[loop
]);
240 void ksmbd_release_inode_hash(void)
242 vfree(inode_hashtable
);
245 static void __ksmbd_inode_close(struct ksmbd_file
*fp
)
247 struct ksmbd_inode
*ci
= fp
->f_ci
;
252 if (ksmbd_stream_fd(fp
) && (ci
->m_flags
& S_DEL_ON_CLS_STREAM
)) {
253 ci
->m_flags
&= ~S_DEL_ON_CLS_STREAM
;
254 err
= ksmbd_vfs_remove_xattr(file_mnt_idmap(filp
),
258 pr_err("remove xattr failed : %s\n",
262 if (atomic_dec_and_test(&ci
->m_count
)) {
263 write_lock(&ci
->m_lock
);
264 if (ci
->m_flags
& (S_DEL_ON_CLS
| S_DEL_PENDING
)) {
265 ci
->m_flags
&= ~(S_DEL_ON_CLS
| S_DEL_PENDING
);
266 write_unlock(&ci
->m_lock
);
267 ksmbd_vfs_unlink(filp
);
268 write_lock(&ci
->m_lock
);
270 write_unlock(&ci
->m_lock
);
272 ksmbd_inode_free(ci
);
276 static void __ksmbd_remove_durable_fd(struct ksmbd_file
*fp
)
278 if (!has_file_id(fp
->persistent_id
))
281 write_lock(&global_ft
.lock
);
282 idr_remove(global_ft
.idr
, fp
->persistent_id
);
283 write_unlock(&global_ft
.lock
);
286 static void __ksmbd_remove_fd(struct ksmbd_file_table
*ft
, struct ksmbd_file
*fp
)
288 if (!has_file_id(fp
->volatile_id
))
291 write_lock(&fp
->f_ci
->m_lock
);
292 list_del_init(&fp
->node
);
293 write_unlock(&fp
->f_ci
->m_lock
);
295 write_lock(&ft
->lock
);
296 idr_remove(ft
->idr
, fp
->volatile_id
);
297 write_unlock(&ft
->lock
);
300 static void __ksmbd_close_fd(struct ksmbd_file_table
*ft
, struct ksmbd_file
*fp
)
303 struct ksmbd_lock
*smb_lock
, *tmp_lock
;
306 __ksmbd_remove_durable_fd(fp
);
307 __ksmbd_remove_fd(ft
, fp
);
309 close_id_del_oplock(fp
);
312 __ksmbd_inode_close(fp
);
313 if (!IS_ERR_OR_NULL(filp
))
316 /* because the reference count of fp is 0, it is guaranteed that
317 * there are not accesses to fp->lock_list.
319 list_for_each_entry_safe(smb_lock
, tmp_lock
, &fp
->lock_list
, flist
) {
320 spin_lock(&fp
->conn
->llist_lock
);
321 list_del(&smb_lock
->clist
);
322 spin_unlock(&fp
->conn
->llist_lock
);
324 list_del(&smb_lock
->flist
);
325 locks_free_lock(smb_lock
->fl
);
329 if (ksmbd_stream_fd(fp
))
330 kfree(fp
->stream
.name
);
331 kmem_cache_free(filp_cache
, fp
);
334 static struct ksmbd_file
*ksmbd_fp_get(struct ksmbd_file
*fp
)
336 if (!atomic_inc_not_zero(&fp
->refcount
))
341 static struct ksmbd_file
*__ksmbd_lookup_fd(struct ksmbd_file_table
*ft
,
344 struct ksmbd_file
*fp
;
346 if (!has_file_id(id
))
349 read_lock(&ft
->lock
);
350 fp
= idr_find(ft
->idr
, id
);
352 fp
= ksmbd_fp_get(fp
);
353 read_unlock(&ft
->lock
);
357 static void __put_fd_final(struct ksmbd_work
*work
, struct ksmbd_file
*fp
)
359 __ksmbd_close_fd(&work
->sess
->file_table
, fp
);
360 atomic_dec(&work
->conn
->stats
.open_files_count
);
363 static void set_close_state_blocked_works(struct ksmbd_file
*fp
)
365 struct ksmbd_work
*cancel_work
;
367 spin_lock(&fp
->f_lock
);
368 list_for_each_entry(cancel_work
, &fp
->blocked_works
,
370 cancel_work
->state
= KSMBD_WORK_CLOSED
;
371 cancel_work
->cancel_fn(cancel_work
->cancel_argv
);
373 spin_unlock(&fp
->f_lock
);
376 int ksmbd_close_fd(struct ksmbd_work
*work
, u64 id
)
378 struct ksmbd_file
*fp
;
379 struct ksmbd_file_table
*ft
;
381 if (!has_file_id(id
))
384 ft
= &work
->sess
->file_table
;
385 read_lock(&ft
->lock
);
386 fp
= idr_find(ft
->idr
, id
);
388 set_close_state_blocked_works(fp
);
390 if (!atomic_dec_and_test(&fp
->refcount
))
393 read_unlock(&ft
->lock
);
398 __put_fd_final(work
, fp
);
402 void ksmbd_fd_put(struct ksmbd_work
*work
, struct ksmbd_file
*fp
)
407 if (!atomic_dec_and_test(&fp
->refcount
))
409 __put_fd_final(work
, fp
);
412 static bool __sanity_check(struct ksmbd_tree_connect
*tcon
, struct ksmbd_file
*fp
)
416 if (fp
->tcon
!= tcon
)
421 struct ksmbd_file
*ksmbd_lookup_foreign_fd(struct ksmbd_work
*work
, u64 id
)
423 return __ksmbd_lookup_fd(&work
->sess
->file_table
, id
);
426 struct ksmbd_file
*ksmbd_lookup_fd_fast(struct ksmbd_work
*work
, u64 id
)
428 struct ksmbd_file
*fp
= __ksmbd_lookup_fd(&work
->sess
->file_table
, id
);
430 if (__sanity_check(work
->tcon
, fp
))
433 ksmbd_fd_put(work
, fp
);
437 struct ksmbd_file
*ksmbd_lookup_fd_slow(struct ksmbd_work
*work
, u64 id
,
440 struct ksmbd_file
*fp
;
442 if (!has_file_id(id
)) {
443 id
= work
->compound_fid
;
444 pid
= work
->compound_pfid
;
447 fp
= __ksmbd_lookup_fd(&work
->sess
->file_table
, id
);
448 if (!__sanity_check(work
->tcon
, fp
)) {
449 ksmbd_fd_put(work
, fp
);
452 if (fp
->persistent_id
!= pid
) {
453 ksmbd_fd_put(work
, fp
);
459 struct ksmbd_file
*ksmbd_lookup_durable_fd(unsigned long long id
)
461 return __ksmbd_lookup_fd(&global_ft
, id
);
464 struct ksmbd_file
*ksmbd_lookup_fd_cguid(char *cguid
)
466 struct ksmbd_file
*fp
= NULL
;
469 read_lock(&global_ft
.lock
);
470 idr_for_each_entry(global_ft
.idr
, fp
, id
) {
471 if (!memcmp(fp
->create_guid
,
473 SMB2_CREATE_GUID_SIZE
)) {
474 fp
= ksmbd_fp_get(fp
);
478 read_unlock(&global_ft
.lock
);
483 struct ksmbd_file
*ksmbd_lookup_fd_inode(struct inode
*inode
)
485 struct ksmbd_file
*lfp
;
486 struct ksmbd_inode
*ci
;
488 ci
= ksmbd_inode_lookup_by_vfsinode(inode
);
492 read_lock(&ci
->m_lock
);
493 list_for_each_entry(lfp
, &ci
->m_fp_list
, node
) {
494 if (inode
== file_inode(lfp
->filp
)) {
495 atomic_dec(&ci
->m_count
);
496 lfp
= ksmbd_fp_get(lfp
);
497 read_unlock(&ci
->m_lock
);
501 atomic_dec(&ci
->m_count
);
502 read_unlock(&ci
->m_lock
);
506 #define OPEN_ID_TYPE_VOLATILE_ID (0)
507 #define OPEN_ID_TYPE_PERSISTENT_ID (1)
509 static void __open_id_set(struct ksmbd_file
*fp
, u64 id
, int type
)
511 if (type
== OPEN_ID_TYPE_VOLATILE_ID
)
512 fp
->volatile_id
= id
;
513 if (type
== OPEN_ID_TYPE_PERSISTENT_ID
)
514 fp
->persistent_id
= id
;
517 static int __open_id(struct ksmbd_file_table
*ft
, struct ksmbd_file
*fp
,
523 if (type
== OPEN_ID_TYPE_VOLATILE_ID
&& fd_limit_depleted()) {
524 __open_id_set(fp
, KSMBD_NO_FID
, type
);
528 idr_preload(GFP_KERNEL
);
529 write_lock(&ft
->lock
);
530 ret
= idr_alloc_cyclic(ft
->idr
, fp
, 0, INT_MAX
- 1, GFP_NOWAIT
);
539 __open_id_set(fp
, id
, type
);
540 write_unlock(&ft
->lock
);
545 unsigned int ksmbd_open_durable_fd(struct ksmbd_file
*fp
)
547 __open_id(&global_ft
, fp
, OPEN_ID_TYPE_PERSISTENT_ID
);
548 return fp
->persistent_id
;
551 struct ksmbd_file
*ksmbd_open_fd(struct ksmbd_work
*work
, struct file
*filp
)
553 struct ksmbd_file
*fp
;
556 fp
= kmem_cache_zalloc(filp_cache
, GFP_KERNEL
);
558 pr_err("Failed to allocate memory\n");
559 return ERR_PTR(-ENOMEM
);
562 INIT_LIST_HEAD(&fp
->blocked_works
);
563 INIT_LIST_HEAD(&fp
->node
);
564 INIT_LIST_HEAD(&fp
->lock_list
);
565 spin_lock_init(&fp
->f_lock
);
566 atomic_set(&fp
->refcount
, 1);
569 fp
->conn
= work
->conn
;
570 fp
->tcon
= work
->tcon
;
571 fp
->volatile_id
= KSMBD_NO_FID
;
572 fp
->persistent_id
= KSMBD_NO_FID
;
573 fp
->f_ci
= ksmbd_inode_get(fp
);
580 ret
= __open_id(&work
->sess
->file_table
, fp
, OPEN_ID_TYPE_VOLATILE_ID
);
582 ksmbd_inode_put(fp
->f_ci
);
586 atomic_inc(&work
->conn
->stats
.open_files_count
);
590 kmem_cache_free(filp_cache
, fp
);
595 __close_file_table_ids(struct ksmbd_file_table
*ft
,
596 struct ksmbd_tree_connect
*tcon
,
597 bool (*skip
)(struct ksmbd_tree_connect
*tcon
,
598 struct ksmbd_file
*fp
))
601 struct ksmbd_file
*fp
;
604 idr_for_each_entry(ft
->idr
, fp
, id
) {
608 set_close_state_blocked_works(fp
);
610 if (!atomic_dec_and_test(&fp
->refcount
))
612 __ksmbd_close_fd(ft
, fp
);
618 static bool tree_conn_fd_check(struct ksmbd_tree_connect
*tcon
,
619 struct ksmbd_file
*fp
)
621 return fp
->tcon
!= tcon
;
624 static bool session_fd_check(struct ksmbd_tree_connect
*tcon
,
625 struct ksmbd_file
*fp
)
630 void ksmbd_close_tree_conn_fds(struct ksmbd_work
*work
)
632 int num
= __close_file_table_ids(&work
->sess
->file_table
,
636 atomic_sub(num
, &work
->conn
->stats
.open_files_count
);
639 void ksmbd_close_session_fds(struct ksmbd_work
*work
)
641 int num
= __close_file_table_ids(&work
->sess
->file_table
,
645 atomic_sub(num
, &work
->conn
->stats
.open_files_count
);
648 int ksmbd_init_global_file_table(void)
650 return ksmbd_init_file_table(&global_ft
);
653 void ksmbd_free_global_file_table(void)
655 struct ksmbd_file
*fp
= NULL
;
658 idr_for_each_entry(global_ft
.idr
, fp
, id
) {
659 __ksmbd_remove_durable_fd(fp
);
660 kmem_cache_free(filp_cache
, fp
);
663 ksmbd_destroy_file_table(&global_ft
);
666 int ksmbd_init_file_table(struct ksmbd_file_table
*ft
)
668 ft
->idr
= kzalloc(sizeof(struct idr
), GFP_KERNEL
);
673 rwlock_init(&ft
->lock
);
677 void ksmbd_destroy_file_table(struct ksmbd_file_table
*ft
)
682 __close_file_table_ids(ft
, NULL
, session_fd_check
);
683 idr_destroy(ft
->idr
);
688 int ksmbd_init_file_cache(void)
690 filp_cache
= kmem_cache_create("ksmbd_file_cache",
691 sizeof(struct ksmbd_file
), 0,
692 SLAB_HWCACHE_ALIGN
, NULL
);
699 pr_err("failed to allocate file cache\n");
703 void ksmbd_exit_file_cache(void)
705 kmem_cache_destroy(filp_cache
);