138c8a9a5SSteve French // SPDX-License-Identifier: GPL-2.0-or-later 238c8a9a5SSteve French /* 338c8a9a5SSteve French * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> 438c8a9a5SSteve French * Copyright (C) 2019 Samsung Electronics Co., Ltd. 538c8a9a5SSteve French */ 638c8a9a5SSteve French 738c8a9a5SSteve French #include <linux/fs.h> 838c8a9a5SSteve French #include <linux/filelock.h> 938c8a9a5SSteve French #include <linux/slab.h> 1038c8a9a5SSteve French #include <linux/vmalloc.h> 1138c8a9a5SSteve French 1238c8a9a5SSteve French #include "glob.h" 1338c8a9a5SSteve French #include "vfs_cache.h" 1438c8a9a5SSteve French #include "oplock.h" 1538c8a9a5SSteve French #include "vfs.h" 1638c8a9a5SSteve French #include "connection.h" 1738c8a9a5SSteve French #include "mgmt/tree_connect.h" 1838c8a9a5SSteve French #include "mgmt/user_session.h" 1938c8a9a5SSteve French #include "smb_common.h" 2038c8a9a5SSteve French 2138c8a9a5SSteve French #define S_DEL_PENDING 1 2238c8a9a5SSteve French #define S_DEL_ON_CLS 2 2338c8a9a5SSteve French #define S_DEL_ON_CLS_STREAM 8 2438c8a9a5SSteve French 2538c8a9a5SSteve French static unsigned int inode_hash_mask __read_mostly; 2638c8a9a5SSteve French static unsigned int inode_hash_shift __read_mostly; 2738c8a9a5SSteve French static struct hlist_head *inode_hashtable __read_mostly; 2838c8a9a5SSteve French static DEFINE_RWLOCK(inode_hash_lock); 2938c8a9a5SSteve French 3038c8a9a5SSteve French static struct ksmbd_file_table global_ft; 3138c8a9a5SSteve French static atomic_long_t fd_limit; 3238c8a9a5SSteve French static struct kmem_cache *filp_cache; 3338c8a9a5SSteve French 3438c8a9a5SSteve French void ksmbd_set_fd_limit(unsigned long limit) 3538c8a9a5SSteve French { 3638c8a9a5SSteve French limit = min(limit, get_max_files()); 3738c8a9a5SSteve French atomic_long_set(&fd_limit, limit); 3838c8a9a5SSteve French } 3938c8a9a5SSteve French 4038c8a9a5SSteve French static bool fd_limit_depleted(void) 4138c8a9a5SSteve French { 4238c8a9a5SSteve French long v = atomic_long_dec_return(&fd_limit); 4338c8a9a5SSteve French 4438c8a9a5SSteve French if (v >= 0) 4538c8a9a5SSteve French return false; 4638c8a9a5SSteve French atomic_long_inc(&fd_limit); 4738c8a9a5SSteve French return true; 4838c8a9a5SSteve French } 4938c8a9a5SSteve French 5038c8a9a5SSteve French static void fd_limit_close(void) 5138c8a9a5SSteve French { 5238c8a9a5SSteve French atomic_long_inc(&fd_limit); 5338c8a9a5SSteve French } 5438c8a9a5SSteve French 5538c8a9a5SSteve French /* 5638c8a9a5SSteve French * INODE hash 5738c8a9a5SSteve French */ 5838c8a9a5SSteve French 5938c8a9a5SSteve French static unsigned long inode_hash(struct super_block *sb, unsigned long hashval) 6038c8a9a5SSteve French { 6138c8a9a5SSteve French unsigned long tmp; 6238c8a9a5SSteve French 6338c8a9a5SSteve French tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / 6438c8a9a5SSteve French L1_CACHE_BYTES; 6538c8a9a5SSteve French tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> inode_hash_shift); 6638c8a9a5SSteve French return tmp & inode_hash_mask; 6738c8a9a5SSteve French } 6838c8a9a5SSteve French 6938c8a9a5SSteve French static struct ksmbd_inode *__ksmbd_inode_lookup(struct inode *inode) 7038c8a9a5SSteve French { 7138c8a9a5SSteve French struct hlist_head *head = inode_hashtable + 7238c8a9a5SSteve French inode_hash(inode->i_sb, inode->i_ino); 7338c8a9a5SSteve French struct ksmbd_inode *ci = NULL, *ret_ci = NULL; 7438c8a9a5SSteve French 7538c8a9a5SSteve French hlist_for_each_entry(ci, head, m_hash) { 7638c8a9a5SSteve French if (ci->m_inode == inode) { 7738c8a9a5SSteve French if (atomic_inc_not_zero(&ci->m_count)) 7838c8a9a5SSteve French ret_ci = ci; 7938c8a9a5SSteve French break; 8038c8a9a5SSteve French } 8138c8a9a5SSteve French } 8238c8a9a5SSteve French return ret_ci; 8338c8a9a5SSteve French } 8438c8a9a5SSteve French 8538c8a9a5SSteve French static struct ksmbd_inode *ksmbd_inode_lookup(struct ksmbd_file *fp) 8638c8a9a5SSteve French { 8738c8a9a5SSteve French return __ksmbd_inode_lookup(file_inode(fp->filp)); 8838c8a9a5SSteve French } 8938c8a9a5SSteve French 9038c8a9a5SSteve French static struct ksmbd_inode *ksmbd_inode_lookup_by_vfsinode(struct inode *inode) 9138c8a9a5SSteve French { 9238c8a9a5SSteve French struct ksmbd_inode *ci; 9338c8a9a5SSteve French 9438c8a9a5SSteve French read_lock(&inode_hash_lock); 9538c8a9a5SSteve French ci = __ksmbd_inode_lookup(inode); 9638c8a9a5SSteve French read_unlock(&inode_hash_lock); 9738c8a9a5SSteve French return ci; 9838c8a9a5SSteve French } 9938c8a9a5SSteve French 10038c8a9a5SSteve French int ksmbd_query_inode_status(struct inode *inode) 10138c8a9a5SSteve French { 10238c8a9a5SSteve French struct ksmbd_inode *ci; 10338c8a9a5SSteve French int ret = KSMBD_INODE_STATUS_UNKNOWN; 10438c8a9a5SSteve French 10538c8a9a5SSteve French read_lock(&inode_hash_lock); 10638c8a9a5SSteve French ci = __ksmbd_inode_lookup(inode); 10738c8a9a5SSteve French if (ci) { 10838c8a9a5SSteve French ret = KSMBD_INODE_STATUS_OK; 109*f4332835SNamjae Jeon if (ci->m_flags & (S_DEL_PENDING | S_DEL_ON_CLS)) 11038c8a9a5SSteve French ret = KSMBD_INODE_STATUS_PENDING_DELETE; 11138c8a9a5SSteve French atomic_dec(&ci->m_count); 11238c8a9a5SSteve French } 11338c8a9a5SSteve French read_unlock(&inode_hash_lock); 11438c8a9a5SSteve French return ret; 11538c8a9a5SSteve French } 11638c8a9a5SSteve French 11738c8a9a5SSteve French bool ksmbd_inode_pending_delete(struct ksmbd_file *fp) 11838c8a9a5SSteve French { 119*f4332835SNamjae Jeon return (fp->f_ci->m_flags & (S_DEL_PENDING | S_DEL_ON_CLS)); 12038c8a9a5SSteve French } 12138c8a9a5SSteve French 12238c8a9a5SSteve French void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp) 12338c8a9a5SSteve French { 12438c8a9a5SSteve French fp->f_ci->m_flags |= S_DEL_PENDING; 12538c8a9a5SSteve French } 12638c8a9a5SSteve French 12738c8a9a5SSteve French void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp) 12838c8a9a5SSteve French { 12938c8a9a5SSteve French fp->f_ci->m_flags &= ~S_DEL_PENDING; 13038c8a9a5SSteve French } 13138c8a9a5SSteve French 13238c8a9a5SSteve French void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp, 13338c8a9a5SSteve French int file_info) 13438c8a9a5SSteve French { 13538c8a9a5SSteve French if (ksmbd_stream_fd(fp)) { 13638c8a9a5SSteve French fp->f_ci->m_flags |= S_DEL_ON_CLS_STREAM; 13738c8a9a5SSteve French return; 13838c8a9a5SSteve French } 13938c8a9a5SSteve French 14038c8a9a5SSteve French fp->f_ci->m_flags |= S_DEL_ON_CLS; 14138c8a9a5SSteve French } 14238c8a9a5SSteve French 14338c8a9a5SSteve French static void ksmbd_inode_hash(struct ksmbd_inode *ci) 14438c8a9a5SSteve French { 14538c8a9a5SSteve French struct hlist_head *b = inode_hashtable + 14638c8a9a5SSteve French inode_hash(ci->m_inode->i_sb, ci->m_inode->i_ino); 14738c8a9a5SSteve French 14838c8a9a5SSteve French hlist_add_head(&ci->m_hash, b); 14938c8a9a5SSteve French } 15038c8a9a5SSteve French 15138c8a9a5SSteve French static void ksmbd_inode_unhash(struct ksmbd_inode *ci) 15238c8a9a5SSteve French { 15338c8a9a5SSteve French write_lock(&inode_hash_lock); 15438c8a9a5SSteve French hlist_del_init(&ci->m_hash); 15538c8a9a5SSteve French write_unlock(&inode_hash_lock); 15638c8a9a5SSteve French } 15738c8a9a5SSteve French 15838c8a9a5SSteve French static int ksmbd_inode_init(struct ksmbd_inode *ci, struct ksmbd_file *fp) 15938c8a9a5SSteve French { 16038c8a9a5SSteve French ci->m_inode = file_inode(fp->filp); 16138c8a9a5SSteve French atomic_set(&ci->m_count, 1); 16238c8a9a5SSteve French atomic_set(&ci->op_count, 0); 16338c8a9a5SSteve French atomic_set(&ci->sop_count, 0); 16438c8a9a5SSteve French ci->m_flags = 0; 16538c8a9a5SSteve French ci->m_fattr = 0; 16638c8a9a5SSteve French INIT_LIST_HEAD(&ci->m_fp_list); 16738c8a9a5SSteve French INIT_LIST_HEAD(&ci->m_op_list); 16838c8a9a5SSteve French rwlock_init(&ci->m_lock); 16938c8a9a5SSteve French return 0; 17038c8a9a5SSteve French } 17138c8a9a5SSteve French 17238c8a9a5SSteve French static struct ksmbd_inode *ksmbd_inode_get(struct ksmbd_file *fp) 17338c8a9a5SSteve French { 17438c8a9a5SSteve French struct ksmbd_inode *ci, *tmpci; 17538c8a9a5SSteve French int rc; 17638c8a9a5SSteve French 17738c8a9a5SSteve French read_lock(&inode_hash_lock); 17838c8a9a5SSteve French ci = ksmbd_inode_lookup(fp); 17938c8a9a5SSteve French read_unlock(&inode_hash_lock); 18038c8a9a5SSteve French if (ci) 18138c8a9a5SSteve French return ci; 18238c8a9a5SSteve French 18338c8a9a5SSteve French ci = kmalloc(sizeof(struct ksmbd_inode), GFP_KERNEL); 18438c8a9a5SSteve French if (!ci) 18538c8a9a5SSteve French return NULL; 18638c8a9a5SSteve French 18738c8a9a5SSteve French rc = ksmbd_inode_init(ci, fp); 18838c8a9a5SSteve French if (rc) { 18938c8a9a5SSteve French pr_err("inode initialized failed\n"); 19038c8a9a5SSteve French kfree(ci); 19138c8a9a5SSteve French return NULL; 19238c8a9a5SSteve French } 19338c8a9a5SSteve French 19438c8a9a5SSteve French write_lock(&inode_hash_lock); 19538c8a9a5SSteve French tmpci = ksmbd_inode_lookup(fp); 19638c8a9a5SSteve French if (!tmpci) { 19738c8a9a5SSteve French ksmbd_inode_hash(ci); 19838c8a9a5SSteve French } else { 19938c8a9a5SSteve French kfree(ci); 20038c8a9a5SSteve French ci = tmpci; 20138c8a9a5SSteve French } 20238c8a9a5SSteve French write_unlock(&inode_hash_lock); 20338c8a9a5SSteve French return ci; 20438c8a9a5SSteve French } 20538c8a9a5SSteve French 20638c8a9a5SSteve French static void ksmbd_inode_free(struct ksmbd_inode *ci) 20738c8a9a5SSteve French { 20838c8a9a5SSteve French ksmbd_inode_unhash(ci); 20938c8a9a5SSteve French kfree(ci); 21038c8a9a5SSteve French } 21138c8a9a5SSteve French 21238c8a9a5SSteve French static void ksmbd_inode_put(struct ksmbd_inode *ci) 21338c8a9a5SSteve French { 21438c8a9a5SSteve French if (atomic_dec_and_test(&ci->m_count)) 21538c8a9a5SSteve French ksmbd_inode_free(ci); 21638c8a9a5SSteve French } 21738c8a9a5SSteve French 21838c8a9a5SSteve French int __init ksmbd_inode_hash_init(void) 21938c8a9a5SSteve French { 22038c8a9a5SSteve French unsigned int loop; 22138c8a9a5SSteve French unsigned long numentries = 16384; 22238c8a9a5SSteve French unsigned long bucketsize = sizeof(struct hlist_head); 22338c8a9a5SSteve French unsigned long size; 22438c8a9a5SSteve French 22538c8a9a5SSteve French inode_hash_shift = ilog2(numentries); 22638c8a9a5SSteve French inode_hash_mask = (1 << inode_hash_shift) - 1; 22738c8a9a5SSteve French 22838c8a9a5SSteve French size = bucketsize << inode_hash_shift; 22938c8a9a5SSteve French 23038c8a9a5SSteve French /* init master fp hash table */ 23138c8a9a5SSteve French inode_hashtable = vmalloc(size); 23238c8a9a5SSteve French if (!inode_hashtable) 23338c8a9a5SSteve French return -ENOMEM; 23438c8a9a5SSteve French 23538c8a9a5SSteve French for (loop = 0; loop < (1U << inode_hash_shift); loop++) 23638c8a9a5SSteve French INIT_HLIST_HEAD(&inode_hashtable[loop]); 23738c8a9a5SSteve French return 0; 23838c8a9a5SSteve French } 23938c8a9a5SSteve French 24038c8a9a5SSteve French void ksmbd_release_inode_hash(void) 24138c8a9a5SSteve French { 24238c8a9a5SSteve French vfree(inode_hashtable); 24338c8a9a5SSteve French } 24438c8a9a5SSteve French 24538c8a9a5SSteve French static void __ksmbd_inode_close(struct ksmbd_file *fp) 24638c8a9a5SSteve French { 24738c8a9a5SSteve French struct ksmbd_inode *ci = fp->f_ci; 24838c8a9a5SSteve French int err; 24938c8a9a5SSteve French struct file *filp; 25038c8a9a5SSteve French 25138c8a9a5SSteve French filp = fp->filp; 25238c8a9a5SSteve French if (ksmbd_stream_fd(fp) && (ci->m_flags & S_DEL_ON_CLS_STREAM)) { 25338c8a9a5SSteve French ci->m_flags &= ~S_DEL_ON_CLS_STREAM; 25438c8a9a5SSteve French err = ksmbd_vfs_remove_xattr(file_mnt_idmap(filp), 25540b268d3SNamjae Jeon &filp->f_path, 25638c8a9a5SSteve French fp->stream.name); 25738c8a9a5SSteve French if (err) 25838c8a9a5SSteve French pr_err("remove xattr failed : %s\n", 25938c8a9a5SSteve French fp->stream.name); 26038c8a9a5SSteve French } 26138c8a9a5SSteve French 26238c8a9a5SSteve French if (atomic_dec_and_test(&ci->m_count)) { 26338c8a9a5SSteve French write_lock(&ci->m_lock); 26438c8a9a5SSteve French if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING)) { 26538c8a9a5SSteve French ci->m_flags &= ~(S_DEL_ON_CLS | S_DEL_PENDING); 26638c8a9a5SSteve French write_unlock(&ci->m_lock); 26738c8a9a5SSteve French ksmbd_vfs_unlink(filp); 26838c8a9a5SSteve French write_lock(&ci->m_lock); 26938c8a9a5SSteve French } 27038c8a9a5SSteve French write_unlock(&ci->m_lock); 27138c8a9a5SSteve French 27238c8a9a5SSteve French ksmbd_inode_free(ci); 27338c8a9a5SSteve French } 27438c8a9a5SSteve French } 27538c8a9a5SSteve French 27638c8a9a5SSteve French static void __ksmbd_remove_durable_fd(struct ksmbd_file *fp) 27738c8a9a5SSteve French { 27838c8a9a5SSteve French if (!has_file_id(fp->persistent_id)) 27938c8a9a5SSteve French return; 28038c8a9a5SSteve French 28138c8a9a5SSteve French write_lock(&global_ft.lock); 28238c8a9a5SSteve French idr_remove(global_ft.idr, fp->persistent_id); 28338c8a9a5SSteve French write_unlock(&global_ft.lock); 28438c8a9a5SSteve French } 28538c8a9a5SSteve French 28638c8a9a5SSteve French static void __ksmbd_remove_fd(struct ksmbd_file_table *ft, struct ksmbd_file *fp) 28738c8a9a5SSteve French { 28838c8a9a5SSteve French if (!has_file_id(fp->volatile_id)) 28938c8a9a5SSteve French return; 29038c8a9a5SSteve French 29138c8a9a5SSteve French write_lock(&fp->f_ci->m_lock); 29238c8a9a5SSteve French list_del_init(&fp->node); 29338c8a9a5SSteve French write_unlock(&fp->f_ci->m_lock); 29438c8a9a5SSteve French 29538c8a9a5SSteve French write_lock(&ft->lock); 29638c8a9a5SSteve French idr_remove(ft->idr, fp->volatile_id); 29738c8a9a5SSteve French write_unlock(&ft->lock); 29838c8a9a5SSteve French } 29938c8a9a5SSteve French 30038c8a9a5SSteve French static void __ksmbd_close_fd(struct ksmbd_file_table *ft, struct ksmbd_file *fp) 30138c8a9a5SSteve French { 30238c8a9a5SSteve French struct file *filp; 30338c8a9a5SSteve French struct ksmbd_lock *smb_lock, *tmp_lock; 30438c8a9a5SSteve French 30538c8a9a5SSteve French fd_limit_close(); 30638c8a9a5SSteve French __ksmbd_remove_durable_fd(fp); 30738c8a9a5SSteve French __ksmbd_remove_fd(ft, fp); 30838c8a9a5SSteve French 30938c8a9a5SSteve French close_id_del_oplock(fp); 31038c8a9a5SSteve French filp = fp->filp; 31138c8a9a5SSteve French 31238c8a9a5SSteve French __ksmbd_inode_close(fp); 31338c8a9a5SSteve French if (!IS_ERR_OR_NULL(filp)) 31438c8a9a5SSteve French fput(filp); 31538c8a9a5SSteve French 31638c8a9a5SSteve French /* because the reference count of fp is 0, it is guaranteed that 31738c8a9a5SSteve French * there are not accesses to fp->lock_list. 31838c8a9a5SSteve French */ 31938c8a9a5SSteve French list_for_each_entry_safe(smb_lock, tmp_lock, &fp->lock_list, flist) { 32038c8a9a5SSteve French spin_lock(&fp->conn->llist_lock); 32138c8a9a5SSteve French list_del(&smb_lock->clist); 32238c8a9a5SSteve French spin_unlock(&fp->conn->llist_lock); 32338c8a9a5SSteve French 32438c8a9a5SSteve French list_del(&smb_lock->flist); 32538c8a9a5SSteve French locks_free_lock(smb_lock->fl); 32638c8a9a5SSteve French kfree(smb_lock); 32738c8a9a5SSteve French } 32838c8a9a5SSteve French 32938c8a9a5SSteve French if (ksmbd_stream_fd(fp)) 33038c8a9a5SSteve French kfree(fp->stream.name); 33138c8a9a5SSteve French kmem_cache_free(filp_cache, fp); 33238c8a9a5SSteve French } 33338c8a9a5SSteve French 33438c8a9a5SSteve French static struct ksmbd_file *ksmbd_fp_get(struct ksmbd_file *fp) 33538c8a9a5SSteve French { 3365a7ee91dSNamjae Jeon if (fp->f_state != FP_INITED) 3375a7ee91dSNamjae Jeon return NULL; 3385a7ee91dSNamjae Jeon 33938c8a9a5SSteve French if (!atomic_inc_not_zero(&fp->refcount)) 34038c8a9a5SSteve French return NULL; 34138c8a9a5SSteve French return fp; 34238c8a9a5SSteve French } 34338c8a9a5SSteve French 34438c8a9a5SSteve French static struct ksmbd_file *__ksmbd_lookup_fd(struct ksmbd_file_table *ft, 34538c8a9a5SSteve French u64 id) 34638c8a9a5SSteve French { 34738c8a9a5SSteve French struct ksmbd_file *fp; 34838c8a9a5SSteve French 34938c8a9a5SSteve French if (!has_file_id(id)) 35038c8a9a5SSteve French return NULL; 35138c8a9a5SSteve French 35238c8a9a5SSteve French read_lock(&ft->lock); 35338c8a9a5SSteve French fp = idr_find(ft->idr, id); 35438c8a9a5SSteve French if (fp) 35538c8a9a5SSteve French fp = ksmbd_fp_get(fp); 35638c8a9a5SSteve French read_unlock(&ft->lock); 35738c8a9a5SSteve French return fp; 35838c8a9a5SSteve French } 35938c8a9a5SSteve French 36038c8a9a5SSteve French static void __put_fd_final(struct ksmbd_work *work, struct ksmbd_file *fp) 36138c8a9a5SSteve French { 36238c8a9a5SSteve French __ksmbd_close_fd(&work->sess->file_table, fp); 36338c8a9a5SSteve French atomic_dec(&work->conn->stats.open_files_count); 36438c8a9a5SSteve French } 36538c8a9a5SSteve French 36638c8a9a5SSteve French static void set_close_state_blocked_works(struct ksmbd_file *fp) 36738c8a9a5SSteve French { 36838c8a9a5SSteve French struct ksmbd_work *cancel_work; 36938c8a9a5SSteve French 37038c8a9a5SSteve French spin_lock(&fp->f_lock); 37138c8a9a5SSteve French list_for_each_entry(cancel_work, &fp->blocked_works, 37238c8a9a5SSteve French fp_entry) { 37338c8a9a5SSteve French cancel_work->state = KSMBD_WORK_CLOSED; 37438c8a9a5SSteve French cancel_work->cancel_fn(cancel_work->cancel_argv); 37538c8a9a5SSteve French } 37638c8a9a5SSteve French spin_unlock(&fp->f_lock); 37738c8a9a5SSteve French } 37838c8a9a5SSteve French 37938c8a9a5SSteve French int ksmbd_close_fd(struct ksmbd_work *work, u64 id) 38038c8a9a5SSteve French { 38138c8a9a5SSteve French struct ksmbd_file *fp; 38238c8a9a5SSteve French struct ksmbd_file_table *ft; 38338c8a9a5SSteve French 38438c8a9a5SSteve French if (!has_file_id(id)) 38538c8a9a5SSteve French return 0; 38638c8a9a5SSteve French 38738c8a9a5SSteve French ft = &work->sess->file_table; 3885a7ee91dSNamjae Jeon write_lock(&ft->lock); 38938c8a9a5SSteve French fp = idr_find(ft->idr, id); 39038c8a9a5SSteve French if (fp) { 39138c8a9a5SSteve French set_close_state_blocked_works(fp); 39238c8a9a5SSteve French 3935a7ee91dSNamjae Jeon if (fp->f_state != FP_INITED) 3945a7ee91dSNamjae Jeon fp = NULL; 3955a7ee91dSNamjae Jeon else { 3965a7ee91dSNamjae Jeon fp->f_state = FP_CLOSED; 39738c8a9a5SSteve French if (!atomic_dec_and_test(&fp->refcount)) 39838c8a9a5SSteve French fp = NULL; 39938c8a9a5SSteve French } 4005a7ee91dSNamjae Jeon } 4015a7ee91dSNamjae Jeon write_unlock(&ft->lock); 40238c8a9a5SSteve French 40338c8a9a5SSteve French if (!fp) 40438c8a9a5SSteve French return -EINVAL; 40538c8a9a5SSteve French 40638c8a9a5SSteve French __put_fd_final(work, fp); 40738c8a9a5SSteve French return 0; 40838c8a9a5SSteve French } 40938c8a9a5SSteve French 41038c8a9a5SSteve French void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp) 41138c8a9a5SSteve French { 41238c8a9a5SSteve French if (!fp) 41338c8a9a5SSteve French return; 41438c8a9a5SSteve French 41538c8a9a5SSteve French if (!atomic_dec_and_test(&fp->refcount)) 41638c8a9a5SSteve French return; 41738c8a9a5SSteve French __put_fd_final(work, fp); 41838c8a9a5SSteve French } 41938c8a9a5SSteve French 42038c8a9a5SSteve French static bool __sanity_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp) 42138c8a9a5SSteve French { 42238c8a9a5SSteve French if (!fp) 42338c8a9a5SSteve French return false; 42438c8a9a5SSteve French if (fp->tcon != tcon) 42538c8a9a5SSteve French return false; 42638c8a9a5SSteve French return true; 42738c8a9a5SSteve French } 42838c8a9a5SSteve French 42938c8a9a5SSteve French struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work, u64 id) 43038c8a9a5SSteve French { 43138c8a9a5SSteve French return __ksmbd_lookup_fd(&work->sess->file_table, id); 43238c8a9a5SSteve French } 43338c8a9a5SSteve French 43438c8a9a5SSteve French struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work, u64 id) 43538c8a9a5SSteve French { 43638c8a9a5SSteve French struct ksmbd_file *fp = __ksmbd_lookup_fd(&work->sess->file_table, id); 43738c8a9a5SSteve French 43838c8a9a5SSteve French if (__sanity_check(work->tcon, fp)) 43938c8a9a5SSteve French return fp; 44038c8a9a5SSteve French 44138c8a9a5SSteve French ksmbd_fd_put(work, fp); 44238c8a9a5SSteve French return NULL; 44338c8a9a5SSteve French } 44438c8a9a5SSteve French 44538c8a9a5SSteve French struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id, 44638c8a9a5SSteve French u64 pid) 44738c8a9a5SSteve French { 44838c8a9a5SSteve French struct ksmbd_file *fp; 44938c8a9a5SSteve French 45038c8a9a5SSteve French if (!has_file_id(id)) { 45138c8a9a5SSteve French id = work->compound_fid; 45238c8a9a5SSteve French pid = work->compound_pfid; 45338c8a9a5SSteve French } 45438c8a9a5SSteve French 45538c8a9a5SSteve French fp = __ksmbd_lookup_fd(&work->sess->file_table, id); 45638c8a9a5SSteve French if (!__sanity_check(work->tcon, fp)) { 45738c8a9a5SSteve French ksmbd_fd_put(work, fp); 45838c8a9a5SSteve French return NULL; 45938c8a9a5SSteve French } 46038c8a9a5SSteve French if (fp->persistent_id != pid) { 46138c8a9a5SSteve French ksmbd_fd_put(work, fp); 46238c8a9a5SSteve French return NULL; 46338c8a9a5SSteve French } 46438c8a9a5SSteve French return fp; 46538c8a9a5SSteve French } 46638c8a9a5SSteve French 46738c8a9a5SSteve French struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id) 46838c8a9a5SSteve French { 46938c8a9a5SSteve French return __ksmbd_lookup_fd(&global_ft, id); 47038c8a9a5SSteve French } 47138c8a9a5SSteve French 47238c8a9a5SSteve French struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid) 47338c8a9a5SSteve French { 47438c8a9a5SSteve French struct ksmbd_file *fp = NULL; 47538c8a9a5SSteve French unsigned int id; 47638c8a9a5SSteve French 47738c8a9a5SSteve French read_lock(&global_ft.lock); 47838c8a9a5SSteve French idr_for_each_entry(global_ft.idr, fp, id) { 47938c8a9a5SSteve French if (!memcmp(fp->create_guid, 48038c8a9a5SSteve French cguid, 48138c8a9a5SSteve French SMB2_CREATE_GUID_SIZE)) { 48238c8a9a5SSteve French fp = ksmbd_fp_get(fp); 48338c8a9a5SSteve French break; 48438c8a9a5SSteve French } 48538c8a9a5SSteve French } 48638c8a9a5SSteve French read_unlock(&global_ft.lock); 48738c8a9a5SSteve French 48838c8a9a5SSteve French return fp; 48938c8a9a5SSteve French } 49038c8a9a5SSteve French 49138c8a9a5SSteve French struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode) 49238c8a9a5SSteve French { 49338c8a9a5SSteve French struct ksmbd_file *lfp; 49438c8a9a5SSteve French struct ksmbd_inode *ci; 49538c8a9a5SSteve French 49638c8a9a5SSteve French ci = ksmbd_inode_lookup_by_vfsinode(inode); 49738c8a9a5SSteve French if (!ci) 49838c8a9a5SSteve French return NULL; 49938c8a9a5SSteve French 50038c8a9a5SSteve French read_lock(&ci->m_lock); 50138c8a9a5SSteve French list_for_each_entry(lfp, &ci->m_fp_list, node) { 50238c8a9a5SSteve French if (inode == file_inode(lfp->filp)) { 50338c8a9a5SSteve French atomic_dec(&ci->m_count); 50438c8a9a5SSteve French lfp = ksmbd_fp_get(lfp); 50538c8a9a5SSteve French read_unlock(&ci->m_lock); 50638c8a9a5SSteve French return lfp; 50738c8a9a5SSteve French } 50838c8a9a5SSteve French } 50938c8a9a5SSteve French atomic_dec(&ci->m_count); 51038c8a9a5SSteve French read_unlock(&ci->m_lock); 51138c8a9a5SSteve French return NULL; 51238c8a9a5SSteve French } 51338c8a9a5SSteve French 51438c8a9a5SSteve French #define OPEN_ID_TYPE_VOLATILE_ID (0) 51538c8a9a5SSteve French #define OPEN_ID_TYPE_PERSISTENT_ID (1) 51638c8a9a5SSteve French 51738c8a9a5SSteve French static void __open_id_set(struct ksmbd_file *fp, u64 id, int type) 51838c8a9a5SSteve French { 51938c8a9a5SSteve French if (type == OPEN_ID_TYPE_VOLATILE_ID) 52038c8a9a5SSteve French fp->volatile_id = id; 52138c8a9a5SSteve French if (type == OPEN_ID_TYPE_PERSISTENT_ID) 52238c8a9a5SSteve French fp->persistent_id = id; 52338c8a9a5SSteve French } 52438c8a9a5SSteve French 52538c8a9a5SSteve French static int __open_id(struct ksmbd_file_table *ft, struct ksmbd_file *fp, 52638c8a9a5SSteve French int type) 52738c8a9a5SSteve French { 52838c8a9a5SSteve French u64 id = 0; 52938c8a9a5SSteve French int ret; 53038c8a9a5SSteve French 53138c8a9a5SSteve French if (type == OPEN_ID_TYPE_VOLATILE_ID && fd_limit_depleted()) { 53238c8a9a5SSteve French __open_id_set(fp, KSMBD_NO_FID, type); 53338c8a9a5SSteve French return -EMFILE; 53438c8a9a5SSteve French } 53538c8a9a5SSteve French 53638c8a9a5SSteve French idr_preload(GFP_KERNEL); 53738c8a9a5SSteve French write_lock(&ft->lock); 53838c8a9a5SSteve French ret = idr_alloc_cyclic(ft->idr, fp, 0, INT_MAX - 1, GFP_NOWAIT); 53938c8a9a5SSteve French if (ret >= 0) { 54038c8a9a5SSteve French id = ret; 54138c8a9a5SSteve French ret = 0; 54238c8a9a5SSteve French } else { 54338c8a9a5SSteve French id = KSMBD_NO_FID; 54438c8a9a5SSteve French fd_limit_close(); 54538c8a9a5SSteve French } 54638c8a9a5SSteve French 54738c8a9a5SSteve French __open_id_set(fp, id, type); 54838c8a9a5SSteve French write_unlock(&ft->lock); 54938c8a9a5SSteve French idr_preload_end(); 55038c8a9a5SSteve French return ret; 55138c8a9a5SSteve French } 55238c8a9a5SSteve French 55338c8a9a5SSteve French unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp) 55438c8a9a5SSteve French { 55538c8a9a5SSteve French __open_id(&global_ft, fp, OPEN_ID_TYPE_PERSISTENT_ID); 55638c8a9a5SSteve French return fp->persistent_id; 55738c8a9a5SSteve French } 55838c8a9a5SSteve French 55938c8a9a5SSteve French struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work, struct file *filp) 56038c8a9a5SSteve French { 56138c8a9a5SSteve French struct ksmbd_file *fp; 56238c8a9a5SSteve French int ret; 56338c8a9a5SSteve French 56438c8a9a5SSteve French fp = kmem_cache_zalloc(filp_cache, GFP_KERNEL); 56538c8a9a5SSteve French if (!fp) { 56638c8a9a5SSteve French pr_err("Failed to allocate memory\n"); 56738c8a9a5SSteve French return ERR_PTR(-ENOMEM); 56838c8a9a5SSteve French } 56938c8a9a5SSteve French 57038c8a9a5SSteve French INIT_LIST_HEAD(&fp->blocked_works); 57138c8a9a5SSteve French INIT_LIST_HEAD(&fp->node); 57238c8a9a5SSteve French INIT_LIST_HEAD(&fp->lock_list); 57338c8a9a5SSteve French spin_lock_init(&fp->f_lock); 57438c8a9a5SSteve French atomic_set(&fp->refcount, 1); 57538c8a9a5SSteve French 57638c8a9a5SSteve French fp->filp = filp; 57738c8a9a5SSteve French fp->conn = work->conn; 57838c8a9a5SSteve French fp->tcon = work->tcon; 57938c8a9a5SSteve French fp->volatile_id = KSMBD_NO_FID; 58038c8a9a5SSteve French fp->persistent_id = KSMBD_NO_FID; 5815a7ee91dSNamjae Jeon fp->f_state = FP_NEW; 58238c8a9a5SSteve French fp->f_ci = ksmbd_inode_get(fp); 58338c8a9a5SSteve French 58438c8a9a5SSteve French if (!fp->f_ci) { 58538c8a9a5SSteve French ret = -ENOMEM; 58638c8a9a5SSteve French goto err_out; 58738c8a9a5SSteve French } 58838c8a9a5SSteve French 58938c8a9a5SSteve French ret = __open_id(&work->sess->file_table, fp, OPEN_ID_TYPE_VOLATILE_ID); 59038c8a9a5SSteve French if (ret) { 59138c8a9a5SSteve French ksmbd_inode_put(fp->f_ci); 59238c8a9a5SSteve French goto err_out; 59338c8a9a5SSteve French } 59438c8a9a5SSteve French 59538c8a9a5SSteve French atomic_inc(&work->conn->stats.open_files_count); 59638c8a9a5SSteve French return fp; 59738c8a9a5SSteve French 59838c8a9a5SSteve French err_out: 59938c8a9a5SSteve French kmem_cache_free(filp_cache, fp); 60038c8a9a5SSteve French return ERR_PTR(ret); 60138c8a9a5SSteve French } 60238c8a9a5SSteve French 6035a7ee91dSNamjae Jeon void ksmbd_update_fstate(struct ksmbd_file_table *ft, struct ksmbd_file *fp, 6045a7ee91dSNamjae Jeon unsigned int state) 6055a7ee91dSNamjae Jeon { 6065a7ee91dSNamjae Jeon write_lock(&ft->lock); 6075a7ee91dSNamjae Jeon fp->f_state = state; 6085a7ee91dSNamjae Jeon write_unlock(&ft->lock); 6095a7ee91dSNamjae Jeon } 6105a7ee91dSNamjae Jeon 61138c8a9a5SSteve French static int 61238c8a9a5SSteve French __close_file_table_ids(struct ksmbd_file_table *ft, 61338c8a9a5SSteve French struct ksmbd_tree_connect *tcon, 61438c8a9a5SSteve French bool (*skip)(struct ksmbd_tree_connect *tcon, 61538c8a9a5SSteve French struct ksmbd_file *fp)) 61638c8a9a5SSteve French { 61738c8a9a5SSteve French unsigned int id; 61838c8a9a5SSteve French struct ksmbd_file *fp; 61938c8a9a5SSteve French int num = 0; 62038c8a9a5SSteve French 62138c8a9a5SSteve French idr_for_each_entry(ft->idr, fp, id) { 62238c8a9a5SSteve French if (skip(tcon, fp)) 62338c8a9a5SSteve French continue; 62438c8a9a5SSteve French 62538c8a9a5SSteve French set_close_state_blocked_works(fp); 62638c8a9a5SSteve French 62738c8a9a5SSteve French if (!atomic_dec_and_test(&fp->refcount)) 62838c8a9a5SSteve French continue; 62938c8a9a5SSteve French __ksmbd_close_fd(ft, fp); 63038c8a9a5SSteve French num++; 63138c8a9a5SSteve French } 63238c8a9a5SSteve French return num; 63338c8a9a5SSteve French } 63438c8a9a5SSteve French 63538c8a9a5SSteve French static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, 63638c8a9a5SSteve French struct ksmbd_file *fp) 63738c8a9a5SSteve French { 63838c8a9a5SSteve French return fp->tcon != tcon; 63938c8a9a5SSteve French } 64038c8a9a5SSteve French 64138c8a9a5SSteve French static bool session_fd_check(struct ksmbd_tree_connect *tcon, 64238c8a9a5SSteve French struct ksmbd_file *fp) 64338c8a9a5SSteve French { 64438c8a9a5SSteve French return false; 64538c8a9a5SSteve French } 64638c8a9a5SSteve French 64738c8a9a5SSteve French void ksmbd_close_tree_conn_fds(struct ksmbd_work *work) 64838c8a9a5SSteve French { 64938c8a9a5SSteve French int num = __close_file_table_ids(&work->sess->file_table, 65038c8a9a5SSteve French work->tcon, 65138c8a9a5SSteve French tree_conn_fd_check); 65238c8a9a5SSteve French 65338c8a9a5SSteve French atomic_sub(num, &work->conn->stats.open_files_count); 65438c8a9a5SSteve French } 65538c8a9a5SSteve French 65638c8a9a5SSteve French void ksmbd_close_session_fds(struct ksmbd_work *work) 65738c8a9a5SSteve French { 65838c8a9a5SSteve French int num = __close_file_table_ids(&work->sess->file_table, 65938c8a9a5SSteve French work->tcon, 66038c8a9a5SSteve French session_fd_check); 66138c8a9a5SSteve French 66238c8a9a5SSteve French atomic_sub(num, &work->conn->stats.open_files_count); 66338c8a9a5SSteve French } 66438c8a9a5SSteve French 66538c8a9a5SSteve French int ksmbd_init_global_file_table(void) 66638c8a9a5SSteve French { 66738c8a9a5SSteve French return ksmbd_init_file_table(&global_ft); 66838c8a9a5SSteve French } 66938c8a9a5SSteve French 67038c8a9a5SSteve French void ksmbd_free_global_file_table(void) 67138c8a9a5SSteve French { 67238c8a9a5SSteve French struct ksmbd_file *fp = NULL; 67338c8a9a5SSteve French unsigned int id; 67438c8a9a5SSteve French 67538c8a9a5SSteve French idr_for_each_entry(global_ft.idr, fp, id) { 67638c8a9a5SSteve French __ksmbd_remove_durable_fd(fp); 67738c8a9a5SSteve French kmem_cache_free(filp_cache, fp); 67838c8a9a5SSteve French } 67938c8a9a5SSteve French 68038c8a9a5SSteve French ksmbd_destroy_file_table(&global_ft); 68138c8a9a5SSteve French } 68238c8a9a5SSteve French 68338c8a9a5SSteve French int ksmbd_init_file_table(struct ksmbd_file_table *ft) 68438c8a9a5SSteve French { 68538c8a9a5SSteve French ft->idr = kzalloc(sizeof(struct idr), GFP_KERNEL); 68638c8a9a5SSteve French if (!ft->idr) 68738c8a9a5SSteve French return -ENOMEM; 68838c8a9a5SSteve French 68938c8a9a5SSteve French idr_init(ft->idr); 69038c8a9a5SSteve French rwlock_init(&ft->lock); 69138c8a9a5SSteve French return 0; 69238c8a9a5SSteve French } 69338c8a9a5SSteve French 69438c8a9a5SSteve French void ksmbd_destroy_file_table(struct ksmbd_file_table *ft) 69538c8a9a5SSteve French { 69638c8a9a5SSteve French if (!ft->idr) 69738c8a9a5SSteve French return; 69838c8a9a5SSteve French 69938c8a9a5SSteve French __close_file_table_ids(ft, NULL, session_fd_check); 70038c8a9a5SSteve French idr_destroy(ft->idr); 70138c8a9a5SSteve French kfree(ft->idr); 70238c8a9a5SSteve French ft->idr = NULL; 70338c8a9a5SSteve French } 70438c8a9a5SSteve French 70538c8a9a5SSteve French int ksmbd_init_file_cache(void) 70638c8a9a5SSteve French { 70738c8a9a5SSteve French filp_cache = kmem_cache_create("ksmbd_file_cache", 70838c8a9a5SSteve French sizeof(struct ksmbd_file), 0, 70938c8a9a5SSteve French SLAB_HWCACHE_ALIGN, NULL); 71038c8a9a5SSteve French if (!filp_cache) 71138c8a9a5SSteve French goto out; 71238c8a9a5SSteve French 71338c8a9a5SSteve French return 0; 71438c8a9a5SSteve French 71538c8a9a5SSteve French out: 71638c8a9a5SSteve French pr_err("failed to allocate file cache\n"); 71738c8a9a5SSteve French return -ENOMEM; 71838c8a9a5SSteve French } 71938c8a9a5SSteve French 72038c8a9a5SSteve French void ksmbd_exit_file_cache(void) 72138c8a9a5SSteve French { 72238c8a9a5SSteve French kmem_cache_destroy(filp_cache); 72338c8a9a5SSteve French } 724