/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * SMB Node State Machine * ---------------------- * * * +----------- Creation/Allocation * | * | T0 * | * v * +----------------------------+ T1 * | SMB_NODE_STATE_AVAILABLE |--------------------+ * +----------------------------+ | * | ^ | * | | v * | | T2 +-------------------------------+ * | |<---------| SMB_NODE_STATE_OPLOCK_GRANTED | * | | +-------------------------------+ * | T5 | | * | | | T3 * | | v * | | T4 +--------------------------------+ * | +----------| SMB_NODE_STATE_OPLOCK_BREAKING | * | +--------------------------------+ * | * v * +-----------------------------+ * | SMB_NODE_STATE_DESTROYING | * +-----------------------------+ * | * | * | T6 * | * +----------> Deletion/Free * * Transition T0 * * This transition occurs in smb_node_lookup(). If the node looked for is * not found in the has table a new node is created. The reference count is * initialized to 1 and the state initialized to SMB_NODE_STATE_AVAILABLE. * * Transition T1 * * This transition occurs smb_oplock_acquire() during an OPEN. * * Transition T2 * * This transition occurs in smb_oplock_release(). The events triggering * it are: * * - LockingAndX sent by the client that was granted the oplock. * - Closing of the file. * * Transition T3 * * This transition occurs in smb_oplock_break(). The events triggering * it are: * * - Another client wants to open the file. * - A client is trying to delete the file. * - A client is trying to rename the file. * - A client is trying to set/modify the file attributes. * * Transition T4 * * This transition occurs in smb_oplock_release or smb_oplock_break(). The * events triggering it are: * * - The client that was granting the oplock releases it (close or * LockingAndx). * - The time alloted to release the oplock expired. * * Transition T5 * * This transition occurs in smb_node_release(). If the reference count * drops to zero the state is moved to SMB_NODE_STATE_DESTROYING and no more * reference count will be given out for that node. * * Transition T6 * * This transition occurs in smb_node_release(). The structure is deleted. * * Comments * -------- * * The reason the smb node has 2 states is the following synchronization * rule: * * There's a mutex embedded in the node used to protect its fields and * there's a lock embedded in the bucket of the hash table the node belongs * to. To increment or to decrement the reference count the mutex must be * entered. To insert the node into the bucket and to remove it from the * bucket the lock must be entered in RW_WRITER mode. When both (mutex and * lock) have to be entered, the lock has always to be entered first then * the mutex. This prevents a deadlock between smb_node_lookup() and * smb_node_release() from occurring. However, in smb_node_release() when the * reference count drops to zero and triggers the deletion of the node, the * mutex has to be released before entering the lock of the bucket (to * remove the node). This creates a window during which the node that is * about to be freed could be given out by smb_node_lookup(). To close that * window the node is moved to the state SMB_NODE_STATE_DESTROYING before * releasing the mutex. That way, even if smb_node_lookup() finds it, the * state will indicate that the node should be treated as non existent (of * course the state of the node should be tested/updated under the * protection of the mutex). */ #include #include #include #include #include #include uint32_t smb_is_executable(char *); static void smb_node_delete_on_close(smb_node_t *); static void smb_node_create_audit_buf(smb_node_t *, int); static void smb_node_destroy_audit_buf(smb_node_t *); static void smb_node_audit(smb_node_t *); static smb_node_t *smb_node_alloc(char *, vnode_t *, smb_llist_t *, uint32_t); static void smb_node_free(smb_node_t *); static int smb_node_constructor(void *, void *, int); static void smb_node_destructor(void *, void *); static smb_llist_t *smb_node_get_hash(fsid_t *, smb_attr_t *, uint32_t *); static void smb_node_init_cached_data(smb_node_t *); static void smb_node_clear_cached_data(smb_node_t *); static void smb_node_init_cached_timestamps(smb_node_t *, smb_attr_t *); static void smb_node_clear_cached_timestamps(smb_node_t *); static void smb_node_get_cached_timestamps(smb_node_t *, smb_attr_t *); static void smb_node_set_cached_timestamps(smb_node_t *, smb_attr_t *); static void smb_node_init_cached_allocsz(smb_node_t *, smb_attr_t *); static void smb_node_clear_cached_allocsz(smb_node_t *); static void smb_node_get_cached_allocsz(smb_node_t *, smb_attr_t *); static void smb_node_set_cached_allocsz(smb_node_t *, smb_attr_t *); #define VALIDATE_DIR_NODE(_dir_, _node_) \ ASSERT((_dir_)->n_magic == SMB_NODE_MAGIC); \ ASSERT(((_dir_)->vp->v_xattrdir) || ((_dir_)->vp->v_type == VDIR)); \ ASSERT((_dir_)->n_dnode != (_node_)); /* round sz to DEV_BSIZE block */ #define SMB_ALLOCSZ(sz) (((sz) + DEV_BSIZE-1) & ~(DEV_BSIZE-1)) static kmem_cache_t *smb_node_cache = NULL; static boolean_t smb_node_initialized = B_FALSE; static smb_llist_t smb_node_hash_table[SMBND_HASH_MASK+1]; /* * smb_node_init * * Initialization of the SMB node layer. * * This function is not multi-thread safe. The caller must make sure only one * thread makes the call. */ int smb_node_init(void) { int i; if (smb_node_initialized) return (0); smb_node_cache = kmem_cache_create(SMBSRV_KSTAT_NODE_CACHE, sizeof (smb_node_t), 8, smb_node_constructor, smb_node_destructor, NULL, NULL, NULL, 0); for (i = 0; i <= SMBND_HASH_MASK; i++) { smb_llist_constructor(&smb_node_hash_table[i], sizeof (smb_node_t), offsetof(smb_node_t, n_lnd)); } smb_node_initialized = B_TRUE; return (0); } /* * smb_node_fini * * This function is not multi-thread safe. The caller must make sure only one * thread makes the call. */ void smb_node_fini(void) { int i; if (!smb_node_initialized) return; #ifdef DEBUG for (i = 0; i <= SMBND_HASH_MASK; i++) { smb_node_t *node; /* * The following sequence is just intended for sanity check. * This will have to be modified when the code goes into * production. * * The SMB node hash table should be emtpy at this point. If the * hash table is not empty a panic will be triggered. * * The reason why SMB nodes are still remaining in the hash * table is problably due to a mismatch between calls to * smb_node_lookup() and smb_node_release(). You must track that * down. */ node = smb_llist_head(&smb_node_hash_table[i]); ASSERT(node == NULL); } #endif for (i = 0; i <= SMBND_HASH_MASK; i++) { smb_llist_destructor(&smb_node_hash_table[i]); } kmem_cache_destroy(smb_node_cache); smb_node_cache = NULL; smb_node_initialized = B_FALSE; } /* * smb_node_lookup() * * NOTE: This routine should only be called by the file system interface layer, * and not by SMB. * * smb_node_lookup() is called upon successful lookup, mkdir, and create * (for both non-streams and streams). In each of these cases, a held vnode is * passed into this routine. If a new smb_node is created it will take its * own hold on the vnode. The caller's hold therefore still belongs to, and * should be released by, the caller. * * A reference is taken on the smb_node whether found in the hash table * or newly created. * * If an smb_node needs to be created, a reference is also taken on the * dnode (if passed in). * * See smb_node_release() for details on the release of these references. */ /*ARGSUSED*/ smb_node_t * smb_node_lookup( struct smb_request *sr, struct open_param *op, cred_t *cred, vnode_t *vp, char *od_name, smb_node_t *dnode, smb_node_t *unode) { smb_llist_t *node_hdr; smb_node_t *node; smb_attr_t attr; uint32_t hashkey = 0; fsid_t fsid; int error; krw_t lock_mode; vnode_t *unnamed_vp = NULL; /* * smb_vop_getattr() is called here instead of smb_fsop_getattr(), * because the node may not yet exist. We also do not want to call * it with the list lock held. */ if (unode) unnamed_vp = unode->vp; /* * This getattr is performed on behalf of the server * that's why kcred is used not the user's cred */ attr.sa_mask = SMB_AT_ALL; error = smb_vop_getattr(vp, unnamed_vp, &attr, 0, kcred); if (error) return (NULL); if (sr && sr->tid_tree) { /* * The fsid for a file is that of the tree, even * if the file resides in a different mountpoint * under the share. */ fsid = SMB_TREE_FSID(sr->tid_tree); } else { /* * This should be getting executed only for the * tree root smb_node. */ fsid = vp->v_vfsp->vfs_fsid; } node_hdr = smb_node_get_hash(&fsid, &attr, &hashkey); lock_mode = RW_READER; smb_llist_enter(node_hdr, lock_mode); for (;;) { node = list_head(&node_hdr->ll_list); while (node) { ASSERT(node->n_magic == SMB_NODE_MAGIC); ASSERT(node->n_hash_bucket == node_hdr); if ((node->n_hashkey == hashkey) && (node->vp == vp)) { mutex_enter(&node->n_mutex); DTRACE_PROBE1(smb_node_lookup_hit, smb_node_t *, node); switch (node->n_state) { case SMB_NODE_STATE_OPLOCK_GRANTED: case SMB_NODE_STATE_OPLOCK_BREAKING: case SMB_NODE_STATE_AVAILABLE: /* The node was found. */ node->n_refcnt++; if ((node->n_dnode == NULL) && (dnode != NULL) && (strcmp(od_name, "..") != 0) && (strcmp(od_name, ".") != 0)) { VALIDATE_DIR_NODE(dnode, node); node->n_dnode = dnode; smb_node_ref(dnode); } smb_node_audit(node); mutex_exit(&node->n_mutex); smb_llist_exit(node_hdr); return (node); case SMB_NODE_STATE_DESTROYING: /* * Although the node exists it is about * to be destroyed. We act as it hasn't * been found. */ mutex_exit(&node->n_mutex); break; default: /* * Although the node exists it is in an * unknown state. We act as it hasn't * been found. */ ASSERT(0); mutex_exit(&node->n_mutex); break; } } node = smb_llist_next(node_hdr, node); } if ((lock_mode == RW_READER) && smb_llist_upgrade(node_hdr)) { lock_mode = RW_WRITER; continue; } break; } node = smb_node_alloc(od_name, vp, node_hdr, hashkey); node->n_orig_uid = crgetuid(sr->user_cr); if (op) node->flags |= smb_is_executable(op->fqi.fq_last_comp); if (dnode) { smb_node_ref(dnode); node->n_dnode = dnode; ASSERT(dnode->n_dnode != node); ASSERT((dnode->vp->v_xattrdir) || (dnode->vp->v_type == VDIR)); } if (unode) { smb_node_ref(unode); node->n_unode = unode; } DTRACE_PROBE1(smb_node_lookup_miss, smb_node_t *, node); smb_node_audit(node); smb_llist_insert_head(node_hdr, node); smb_llist_exit(node_hdr); return (node); } /* * smb_stream_node_lookup() * * Note: stream_name (the name that will be stored in the "od_name" field * of a stream's smb_node) is the same as the on-disk name for the stream * except that it does not have SMB_STREAM_PREFIX prepended. */ smb_node_t * smb_stream_node_lookup(smb_request_t *sr, cred_t *cr, smb_node_t *fnode, vnode_t *xattrdirvp, vnode_t *vp, char *stream_name) { smb_node_t *xattrdir_node; smb_node_t *snode; xattrdir_node = smb_node_lookup(sr, NULL, cr, xattrdirvp, XATTR_DIR, fnode, NULL); if (xattrdir_node == NULL) return (NULL); snode = smb_node_lookup(sr, NULL, cr, vp, stream_name, xattrdir_node, fnode); (void) smb_node_release(xattrdir_node); return (snode); } /* * This function should be called whenever a reference is needed on an * smb_node pointer. The copy of an smb_node pointer from one non-local * data structure to another requires a reference to be taken on the smb_node * (unless the usage is localized). Each data structure deallocation routine * will call smb_node_release() on its smb_node pointers. * * In general, an smb_node pointer residing in a structure should never be * stale. A node pointer may be NULL, however, and care should be taken * prior to calling smb_node_ref(), which ASSERTs that the pointer is valid. * Care also needs to be taken with respect to racing deallocations of a * structure. */ void smb_node_ref(smb_node_t *node) { SMB_NODE_VALID(node); mutex_enter(&node->n_mutex); switch (node->n_state) { case SMB_NODE_STATE_AVAILABLE: case SMB_NODE_STATE_OPLOCK_GRANTED: case SMB_NODE_STATE_OPLOCK_BREAKING: node->n_refcnt++; ASSERT(node->n_refcnt); DTRACE_PROBE1(smb_node_ref_exit, smb_node_t *, node); smb_node_audit(node); break; default: SMB_PANIC(); } mutex_exit(&node->n_mutex); } /* * smb_node_lookup() takes a hold on an smb_node, whether found in the * hash table or newly created. This hold is expected to be released * in the following manner. * * smb_node_lookup() takes an address of an smb_node pointer. This should * be getting passed down via a lookup (whether path name or component), mkdir, * create. If the original smb_node pointer resides in a data structure, then * the deallocation routine for the data structure is responsible for calling * smb_node_release() on the smb_node pointer. Alternatively, * smb_node_release() can be called as soon as the smb_node pointer is no longer * needed. In this case, callers are responsible for setting an embedded * pointer to NULL if it is known that the last reference is being released. * * If the passed-in address of the smb_node pointer belongs to a local variable, * then the caller with the local variable should call smb_node_release() * directly. * * smb_node_release() itself will call smb_node_release() on a node's n_dnode, * as smb_node_lookup() takes a hold on dnode. */ void smb_node_release(smb_node_t *node) { SMB_NODE_VALID(node); mutex_enter(&node->n_mutex); ASSERT(node->n_refcnt); DTRACE_PROBE1(smb_node_release, smb_node_t *, node); if (--node->n_refcnt == 0) { switch (node->n_state) { case SMB_NODE_STATE_AVAILABLE: node->n_state = SMB_NODE_STATE_DESTROYING; mutex_exit(&node->n_mutex); smb_llist_enter(node->n_hash_bucket, RW_WRITER); smb_llist_remove(node->n_hash_bucket, node); smb_llist_exit(node->n_hash_bucket); /* * Check if the file was deleted */ smb_node_delete_on_close(node); if (node->n_dnode) { ASSERT(node->n_dnode->n_magic == SMB_NODE_MAGIC); smb_node_release(node->n_dnode); } if (node->n_unode) { ASSERT(node->n_unode->n_magic == SMB_NODE_MAGIC); smb_node_release(node->n_unode); } smb_node_free(node); return; default: SMB_PANIC(); } } smb_node_audit(node); mutex_exit(&node->n_mutex); } static void smb_node_delete_on_close(smb_node_t *node) { smb_node_t *d_snode; int rc = 0; uint32_t flags = 0; d_snode = node->n_dnode; if (node->flags & NODE_FLAGS_DELETE_ON_CLOSE) { node->flags &= ~NODE_FLAGS_DELETE_ON_CLOSE; flags = node->n_delete_on_close_flags; ASSERT(node->od_name != NULL); if (node->vp->v_type == VDIR) rc = smb_fsop_rmdir(0, node->delete_on_close_cred, d_snode, node->od_name, flags); else rc = smb_fsop_remove(0, node->delete_on_close_cred, d_snode, node->od_name, flags); smb_cred_rele(node->delete_on_close_cred); } if (rc != 0) cmn_err(CE_WARN, "File %s could not be removed, rc=%d\n", node->od_name, rc); DTRACE_PROBE2(smb_node_delete_on_close, int, rc, smb_node_t *, node); } /* * smb_node_rename() * */ void smb_node_rename( smb_node_t *from_dnode, smb_node_t *ret_node, smb_node_t *to_dnode, char *to_name) { SMB_NODE_VALID(from_dnode); SMB_NODE_VALID(to_dnode); SMB_NODE_VALID(ret_node); smb_node_ref(to_dnode); mutex_enter(&ret_node->n_mutex); switch (ret_node->n_state) { case SMB_NODE_STATE_AVAILABLE: case SMB_NODE_STATE_OPLOCK_GRANTED: case SMB_NODE_STATE_OPLOCK_BREAKING: ret_node->n_dnode = to_dnode; mutex_exit(&ret_node->n_mutex); ASSERT(to_dnode->n_dnode != ret_node); ASSERT((to_dnode->vp->v_xattrdir) || (to_dnode->vp->v_type == VDIR)); smb_node_release(from_dnode); (void) strcpy(ret_node->od_name, to_name); /* * XXX Need to update attributes? */ break; default: SMB_PANIC(); } } int smb_node_root_init(vnode_t *vp, smb_server_t *sv, smb_node_t **root) { smb_attr_t attr; int error; uint32_t hashkey; smb_llist_t *node_hdr; smb_node_t *node; attr.sa_mask = SMB_AT_ALL; error = smb_vop_getattr(vp, NULL, &attr, 0, kcred); if (error) { VN_RELE(vp); return (error); } node_hdr = smb_node_get_hash(&vp->v_vfsp->vfs_fsid, &attr, &hashkey); node = smb_node_alloc(ROOTVOL, vp, node_hdr, hashkey); sv->si_root_smb_node = node; smb_node_audit(node); smb_llist_enter(node_hdr, RW_WRITER); smb_llist_insert_head(node_hdr, node); smb_llist_exit(node_hdr); *root = node; return (0); } /* * When DeleteOnClose is set on an smb_node, the common open code will * reject subsequent open requests for the file. Observation of Windows * 2000 indicates that subsequent opens should be allowed (assuming * there would be no sharing violation) until the file is closed using * the fid on which the DeleteOnClose was requested. * * If there are multiple opens with delete-on-close create options, * whichever the first file handle is closed will trigger the node to be * marked as delete-on-close. The credentials of that ofile will be used * as the delete-on-close credentials of the node. */ int smb_node_set_delete_on_close(smb_node_t *node, cred_t *cr, uint32_t flags) { int rc = 0; smb_attr_t attr; if (node->readonly_creator) return (-1); bzero(&attr, sizeof (smb_attr_t)); attr.sa_mask = SMB_AT_DOSATTR; rc = smb_fsop_getattr(NULL, kcred, node, &attr); if ((rc != 0) || (attr.sa_dosattr & FILE_ATTRIBUTE_READONLY)) { return (-1); } mutex_enter(&node->n_mutex); if (node->flags & NODE_FLAGS_DELETE_ON_CLOSE) { rc = -1; } else { crhold(cr); node->delete_on_close_cred = cr; node->n_delete_on_close_flags = flags; node->flags |= NODE_FLAGS_DELETE_ON_CLOSE; rc = 0; } mutex_exit(&node->n_mutex); return (rc); } void smb_node_reset_delete_on_close(smb_node_t *node) { mutex_enter(&node->n_mutex); if (node->flags & NODE_FLAGS_DELETE_ON_CLOSE) { node->flags &= ~NODE_FLAGS_DELETE_ON_CLOSE; crfree(node->delete_on_close_cred); node->delete_on_close_cred = NULL; node->n_delete_on_close_flags = 0; } mutex_exit(&node->n_mutex); } /* * smb_node_open_check * * check file sharing rules for current open request * against all existing opens for a file. * * Returns NT_STATUS_SHARING_VIOLATION if there is any * sharing conflict, otherwise returns NT_STATUS_SUCCESS. */ uint32_t smb_node_open_check( smb_node_t *node, cred_t *cr, uint32_t desired_access, uint32_t share_access) { smb_ofile_t *of; uint32_t status; SMB_NODE_VALID(node); smb_llist_enter(&node->n_ofile_list, RW_READER); of = smb_llist_head(&node->n_ofile_list); while (of) { status = smb_ofile_open_check(of, cr, desired_access, share_access); switch (status) { case NT_STATUS_INVALID_HANDLE: case NT_STATUS_SUCCESS: of = smb_llist_next(&node->n_ofile_list, of); break; default: ASSERT(status == NT_STATUS_SHARING_VIOLATION); smb_llist_exit(&node->n_ofile_list); return (status); } } smb_llist_exit(&node->n_ofile_list); return (NT_STATUS_SUCCESS); } uint32_t smb_node_rename_check(smb_node_t *node) { smb_ofile_t *of; uint32_t status; SMB_NODE_VALID(node); /* * Intra-CIFS check */ smb_llist_enter(&node->n_ofile_list, RW_READER); of = smb_llist_head(&node->n_ofile_list); while (of) { status = smb_ofile_rename_check(of); switch (status) { case NT_STATUS_INVALID_HANDLE: case NT_STATUS_SUCCESS: of = smb_llist_next(&node->n_ofile_list, of); break; default: ASSERT(status == NT_STATUS_SHARING_VIOLATION); smb_llist_exit(&node->n_ofile_list); return (status); } } smb_llist_exit(&node->n_ofile_list); /* * system-wide share check */ if (nbl_share_conflict(node->vp, NBL_RENAME, NULL)) return (NT_STATUS_SHARING_VIOLATION); else return (NT_STATUS_SUCCESS); } uint32_t smb_node_delete_check(smb_node_t *node) { smb_ofile_t *of; uint32_t status; SMB_NODE_VALID(node); if (node->vp->v_type == VDIR) return (NT_STATUS_SUCCESS); /* * intra-CIFS check */ smb_llist_enter(&node->n_ofile_list, RW_READER); of = smb_llist_head(&node->n_ofile_list); while (of) { status = smb_ofile_delete_check(of); switch (status) { case NT_STATUS_INVALID_HANDLE: case NT_STATUS_SUCCESS: of = smb_llist_next(&node->n_ofile_list, of); break; default: ASSERT(status == NT_STATUS_SHARING_VIOLATION); smb_llist_exit(&node->n_ofile_list); return (status); } } smb_llist_exit(&node->n_ofile_list); /* * system-wide share check */ if (nbl_share_conflict(node->vp, NBL_REMOVE, NULL)) return (NT_STATUS_SHARING_VIOLATION); else return (NT_STATUS_SUCCESS); } void smb_node_notify_change(smb_node_t *node) { SMB_NODE_VALID(node); if (node->flags & NODE_FLAGS_NOTIFY_CHANGE) { node->flags |= NODE_FLAGS_CHANGED; smb_process_node_notify_change_queue(node); } } /* * smb_node_start_crit() * * Enter critical region for share reservations. * See comments above smb_fsop_shrlock(). */ void smb_node_start_crit(smb_node_t *node, krw_t mode) { rw_enter(&node->n_lock, mode); nbl_start_crit(node->vp, mode); } /* * smb_node_end_crit() * * Exit critical region for share reservations. */ void smb_node_end_crit(smb_node_t *node) { nbl_end_crit(node->vp); rw_exit(&node->n_lock); } int smb_node_in_crit(smb_node_t *node) { return (nbl_in_crit(node->vp) && RW_LOCK_HELD(&node->n_lock)); } void smb_node_rdlock(smb_node_t *node) { rw_enter(&node->n_lock, RW_READER); } void smb_node_wrlock(smb_node_t *node) { rw_enter(&node->n_lock, RW_WRITER); } void smb_node_unlock(smb_node_t *node) { rw_exit(&node->n_lock); } uint32_t smb_node_get_ofile_count(smb_node_t *node) { uint32_t cntr; SMB_NODE_VALID(node); smb_llist_enter(&node->n_ofile_list, RW_READER); cntr = smb_llist_get_count(&node->n_ofile_list); smb_llist_exit(&node->n_ofile_list); return (cntr); } void smb_node_add_ofile(smb_node_t *node, smb_ofile_t *of) { SMB_NODE_VALID(node); smb_llist_enter(&node->n_ofile_list, RW_WRITER); smb_llist_insert_tail(&node->n_ofile_list, of); smb_llist_exit(&node->n_ofile_list); } void smb_node_rem_ofile(smb_node_t *node, smb_ofile_t *of) { SMB_NODE_VALID(node); smb_llist_enter(&node->n_ofile_list, RW_WRITER); smb_llist_remove(&node->n_ofile_list, of); smb_llist_exit(&node->n_ofile_list); } /* * smb_node_inc_open_ofiles */ void smb_node_inc_open_ofiles(smb_node_t *node) { SMB_NODE_VALID(node); mutex_enter(&node->n_mutex); node->n_open_count++; mutex_exit(&node->n_mutex); smb_node_init_cached_data(node); } /* * smb_node_dec_open_ofiles */ void smb_node_dec_open_ofiles(smb_node_t *node) { SMB_NODE_VALID(node); mutex_enter(&node->n_mutex); node->n_open_count--; mutex_exit(&node->n_mutex); smb_node_clear_cached_data(node); } uint32_t smb_node_get_open_ofiles(smb_node_t *node) { uint32_t cnt; SMB_NODE_VALID(node); mutex_enter(&node->n_mutex); cnt = node->n_open_count; mutex_exit(&node->n_mutex); return (cnt); } /* * smb_node_alloc */ static smb_node_t * smb_node_alloc( char *od_name, vnode_t *vp, smb_llist_t *bucket, uint32_t hashkey) { smb_node_t *node; node = kmem_cache_alloc(smb_node_cache, KM_SLEEP); if (node->n_audit_buf != NULL) node->n_audit_buf->anb_index = 0; node->flags = 0; VN_HOLD(vp); node->vp = vp; node->n_refcnt = 1; node->n_hash_bucket = bucket; node->n_hashkey = hashkey; node->n_orig_uid = 0; node->readonly_creator = NULL; node->waiting_event = 0; node->n_open_count = 0; node->n_dnode = NULL; node->n_unode = NULL; node->delete_on_close_cred = NULL; node->n_delete_on_close_flags = 0; (void) strlcpy(node->od_name, od_name, sizeof (node->od_name)); if (strcmp(od_name, XATTR_DIR) == 0) node->flags |= NODE_XATTR_DIR; node->n_state = SMB_NODE_STATE_AVAILABLE; node->n_magic = SMB_NODE_MAGIC; return (node); } /* * smb_node_free */ static void smb_node_free(smb_node_t *node) { SMB_NODE_VALID(node); node->n_magic = 0; VERIFY(!list_link_active(&node->n_lnd)); VERIFY(node->n_lock_list.ll_count == 0); VERIFY(node->n_ofile_list.ll_count == 0); VERIFY(node->n_oplock.ol_xthread == NULL); VERIFY(mutex_owner(&node->n_mutex) == NULL); VERIFY(!RW_LOCK_HELD(&node->n_lock)); VN_RELE(node->vp); kmem_cache_free(smb_node_cache, node); } /* * smb_node_constructor */ static int smb_node_constructor(void *buf, void *un, int kmflags) { _NOTE(ARGUNUSED(kmflags, un)) smb_node_t *node = (smb_node_t *)buf; bzero(node, sizeof (smb_node_t)); smb_llist_constructor(&node->n_ofile_list, sizeof (smb_ofile_t), offsetof(smb_ofile_t, f_nnd)); smb_llist_constructor(&node->n_lock_list, sizeof (smb_lock_t), offsetof(smb_lock_t, l_lnd)); cv_init(&node->n_oplock.ol_cv, NULL, CV_DEFAULT, NULL); rw_init(&node->n_lock, NULL, RW_DEFAULT, NULL); mutex_init(&node->n_mutex, NULL, MUTEX_DEFAULT, NULL); smb_node_create_audit_buf(node, kmflags); return (0); } /* * smb_node_destructor */ static void smb_node_destructor(void *buf, void *un) { _NOTE(ARGUNUSED(un)) smb_node_t *node = (smb_node_t *)buf; smb_node_destroy_audit_buf(node); mutex_destroy(&node->n_mutex); rw_destroy(&node->n_lock); cv_destroy(&node->n_oplock.ol_cv); smb_llist_destructor(&node->n_lock_list); smb_llist_destructor(&node->n_ofile_list); } /* * smb_node_create_audit_buf */ static void smb_node_create_audit_buf(smb_node_t *node, int kmflags) { smb_audit_buf_node_t *abn; if (smb_audit_flags & SMB_AUDIT_NODE) { abn = kmem_zalloc(sizeof (smb_audit_buf_node_t), kmflags); abn->anb_max_index = SMB_AUDIT_BUF_MAX_REC - 1; node->n_audit_buf = abn; } } /* * smb_node_destroy_audit_buf */ static void smb_node_destroy_audit_buf(smb_node_t *node) { if (node->n_audit_buf != NULL) { kmem_free(node->n_audit_buf, sizeof (smb_audit_buf_node_t)); node->n_audit_buf = NULL; } } /* * smb_node_audit * * This function saves the calling stack in the audit buffer of the node passed * in. */ static void smb_node_audit(smb_node_t *node) { smb_audit_buf_node_t *abn; smb_audit_record_node_t *anr; if (node->n_audit_buf) { abn = node->n_audit_buf; anr = abn->anb_records; anr += abn->anb_index; abn->anb_index++; abn->anb_index &= abn->anb_max_index; anr->anr_refcnt = node->n_refcnt; anr->anr_depth = getpcstack(anr->anr_stack, SMB_AUDIT_STACK_DEPTH); } } static smb_llist_t * smb_node_get_hash(fsid_t *fsid, smb_attr_t *attr, uint32_t *phashkey) { uint32_t hashkey; hashkey = fsid->val[0] + attr->sa_vattr.va_nodeid; hashkey += (hashkey >> 24) + (hashkey >> 16) + (hashkey >> 8); *phashkey = hashkey; return (&smb_node_hash_table[(hashkey & SMBND_HASH_MASK)]); } boolean_t smb_node_is_dir(smb_node_t *node) { SMB_NODE_VALID(node); return (node->vp->v_type == VDIR); } boolean_t smb_node_is_link(smb_node_t *node) { SMB_NODE_VALID(node); return (node->vp->v_type == VLNK); } /* * smb_node_file_is_readonly * * Checks if the file (which node represents) is marked readonly * in the filesystem. No account is taken of any pending readonly * in the node, which must be handled by the callers. * (See SMB_OFILE_IS_READONLY and SMB_PATHFILE_IS_READONLY) */ boolean_t smb_node_file_is_readonly(smb_node_t *node) { smb_attr_t attr; if (node == NULL) return (B_FALSE); bzero(&attr, sizeof (smb_attr_t)); attr.sa_mask = SMB_AT_DOSATTR; (void) smb_fsop_getattr(NULL, kcred, node, &attr); return ((attr.sa_dosattr & FILE_ATTRIBUTE_READONLY) != 0); } /* * smb_node_setattr * * The sr may be NULL, for example when closing an ofile. * The ofile may be NULL, for example when a client request * specifies the file by pathname. * * Timestamps * When attributes are set on an ofile, any pending timestamps * from a write request on the ofile are implicitly set to "now". * For compatibility with windows the following timestamps are * also implicitly set to now: * - if any attribute is being explicitly set, set ctime to now * - if file size is being explicitly set, set atime & ctime to now * * Any timestamp that is being explicitly set, or has previously * been explicitly set on the ofile, is excluded from implicit * (now) setting. * * Updates the node's cached timestamp values. * Updates the ofile's explicit times flag. * * File allocation size * When the file allocation size is set it is first rounded up * to block size. If the file size is smaller than the allocation * size the file is truncated by setting the filesize to allocsz. * If there are open ofiles, the allocsz is cached on the node. * * Updates the node's cached allocsz value. * * Returns: errno */ int smb_node_setattr(smb_request_t *sr, smb_node_t *node, cred_t *cr, smb_ofile_t *of, smb_attr_t *attr) { int rc; uint32_t pending_times = 0; uint32_t explicit_times = 0; timestruc_t now; smb_attr_t tmp_attr; ASSERT(attr); SMB_NODE_VALID(node); /* set attributes specified in attr */ if (attr->sa_mask != 0) { /* if allocation size is < file size, truncate the file */ if (attr->sa_mask & SMB_AT_ALLOCSZ) { attr->sa_allocsz = SMB_ALLOCSZ(attr->sa_allocsz); bzero(&tmp_attr, sizeof (smb_attr_t)); tmp_attr.sa_mask = SMB_AT_SIZE; (void) smb_fsop_getattr(NULL, kcred, node, &tmp_attr); if (tmp_attr.sa_vattr.va_size > attr->sa_allocsz) { attr->sa_vattr.va_size = attr->sa_allocsz; attr->sa_mask |= SMB_AT_SIZE; } } rc = smb_fsop_setattr(sr, cr, node, attr); if (rc != 0) return (rc); smb_node_set_cached_allocsz(node, attr); smb_node_set_cached_timestamps(node, attr); if (of) { smb_ofile_set_explicit_times(of, (attr->sa_mask & SMB_AT_TIMES)); } } /* * Determine which timestamps to implicitly set to "now". * Don't overwrite timestamps already explicitly set. */ bzero(&tmp_attr, sizeof (smb_attr_t)); gethrestime(&now); tmp_attr.sa_vattr.va_atime = now; tmp_attr.sa_vattr.va_mtime = now; tmp_attr.sa_vattr.va_ctime = now; /* pending write timestamps */ if (of) { if (smb_ofile_write_time_pending(of)) { pending_times |= (SMB_AT_MTIME | SMB_AT_CTIME | SMB_AT_ATIME); } explicit_times |= (smb_ofile_explicit_times(of)); } explicit_times |= (attr->sa_mask & SMB_AT_TIMES); pending_times &= ~explicit_times; if (pending_times) { tmp_attr.sa_mask = pending_times; (void) smb_fsop_setattr(NULL, kcred, node, &tmp_attr); } /* additional timestamps to update in cache */ if (attr->sa_mask) tmp_attr.sa_mask |= SMB_AT_CTIME; if (attr->sa_mask & (SMB_AT_SIZE | SMB_AT_ALLOCSZ)) tmp_attr.sa_mask |= SMB_AT_MTIME; tmp_attr.sa_mask &= ~explicit_times; if (tmp_attr.sa_mask) smb_node_set_cached_timestamps(node, &tmp_attr); return (0); } /* * smb_node_getattr * * Get attributes from the file system and apply any smb-specific * overrides for size, dos attributes and timestamps * * node->readonly_creator reflects whether a readonly set is pending * from a readonly create. The readonly attribute should be visible to * all clients even though the readonly creator fid is immune to the * readonly bit until close. * * Returns: errno */ int smb_node_getattr(smb_request_t *sr, smb_node_t *node, smb_attr_t *attr) { int rc; SMB_NODE_VALID(node); bzero(attr, sizeof (smb_attr_t)); attr->sa_mask = SMB_AT_ALL; rc = smb_fsop_getattr(sr, kcred, node, attr); if (rc != 0) return (rc); mutex_enter(&node->n_mutex); if (node->vp->v_type == VDIR) { attr->sa_vattr.va_size = 0; attr->sa_allocsz = 0; attr->sa_vattr.va_nlink = 1; } if (node->readonly_creator) attr->sa_dosattr |= FILE_ATTRIBUTE_READONLY; if (attr->sa_dosattr == 0) attr->sa_dosattr = FILE_ATTRIBUTE_NORMAL; mutex_exit(&node->n_mutex); smb_node_get_cached_allocsz(node, attr); smb_node_get_cached_timestamps(node, attr); return (0); } /* * smb_node_init_cached_data */ static void smb_node_init_cached_data(smb_node_t *node) { smb_attr_t attr; bzero(&attr, sizeof (smb_attr_t)); attr.sa_mask = SMB_AT_ALL; (void) smb_fsop_getattr(NULL, kcred, node, &attr); smb_node_init_cached_allocsz(node, &attr); smb_node_init_cached_timestamps(node, &attr); } /* * smb_node_clear_cached_data */ static void smb_node_clear_cached_data(smb_node_t *node) { smb_node_clear_cached_allocsz(node); smb_node_clear_cached_timestamps(node); } /* * File allocation size (allocsz) caching * * When there are open ofiles on the node, the file allocsz is cached. * The cached value (n_allocsz) is initialized when the first ofile is * opened and cleared when the last is closed. Allocsz calculated from * the filesize (rounded up to block size). * When the allocation size is queried, if the cached allocsz is less * than the filesize, it is recalculated from the filesize. */ /* * smb_node_init_cached_allocsz * * If there are open ofiles, cache the allocsz in the node. * Calculate the allocsz from the filesizes. * block size). */ static void smb_node_init_cached_allocsz(smb_node_t *node, smb_attr_t *attr) { mutex_enter(&node->n_mutex); if (node->n_open_count == 1) node->n_allocsz = SMB_ALLOCSZ(attr->sa_vattr.va_size); mutex_exit(&node->n_mutex); } /* * smb_node_clear_cached_allocsz */ static void smb_node_clear_cached_allocsz(smb_node_t *node) { mutex_enter(&node->n_mutex); if (node->n_open_count == 0) node->n_allocsz = 0; mutex_exit(&node->n_mutex); } /* * smb_node_get_cached_allocsz * * If there is no cached allocsz (no open files), calculate * allocsz from the filesize. * If the allocsz is cached but is smaller than the filesize * recalculate the cached allocsz from the filesize. * * Return allocs in attr->sa_allocsz. */ static void smb_node_get_cached_allocsz(smb_node_t *node, smb_attr_t *attr) { if (node->vp->v_type == VDIR) return; mutex_enter(&node->n_mutex); if (node->n_open_count == 0) { attr->sa_allocsz = SMB_ALLOCSZ(attr->sa_vattr.va_size); } else { if (node->n_allocsz < attr->sa_vattr.va_size) node->n_allocsz = SMB_ALLOCSZ(attr->sa_vattr.va_size); attr->sa_allocsz = node->n_allocsz; } mutex_exit(&node->n_mutex); } /* * smb_node_set_cached_allocsz * * attr->sa_allocsz has already been rounded to block size by * the caller. */ static void smb_node_set_cached_allocsz(smb_node_t *node, smb_attr_t *attr) { mutex_enter(&node->n_mutex); if (attr->sa_mask & SMB_AT_ALLOCSZ) { if (node->n_open_count > 0) node->n_allocsz = attr->sa_allocsz; } mutex_exit(&node->n_mutex); } /* * Timestamp caching * * Solaris file systems handle timestamps different from NTFS. For * example when file data is written NTFS doesn't update the timestamps * until the file is closed, and then only if they haven't been explicity * set via a set attribute request. In order to provide a more similar * view of an open file's timestamps, we cache the timestamps in the * node and manipulate them in a manner more consistent with windows. * (See handling of explicit times and pending timestamps from a write * request in smb_node_getattr and smb_node_setattr above.) * Timestamps remain cached while there are open ofiles for the node. * This includes open ofiles for named streams. * n_open_ofiles cannot be used as this doesn't include ofiles opened * for the node's named streams. Thus n_timestamps contains a count * of open ofiles (t_open_ofiles), including named streams' ofiles, * to be used to control timestamp caching. * * If a node represents a named stream the associated unnamed streams * cached timestamps are used instead. */ /* * smb_node_init_cached_timestamps * * Increment count of open ofiles which are using the cached timestamps. * If this is the first open ofile, init the cached timestamps from the * file system values. */ static void smb_node_init_cached_timestamps(smb_node_t *node, smb_attr_t *attr) { smb_node_t *unode; if ((unode = SMB_IS_STREAM(node)) != NULL) node = unode; mutex_enter(&node->n_mutex); ++(node->n_timestamps.t_open_ofiles); if (node->n_timestamps.t_open_ofiles == 1) { node->n_timestamps.t_mtime = attr->sa_vattr.va_mtime; node->n_timestamps.t_atime = attr->sa_vattr.va_atime; node->n_timestamps.t_ctime = attr->sa_vattr.va_ctime; node->n_timestamps.t_crtime = attr->sa_crtime; node->n_timestamps.t_cached = B_TRUE; } mutex_exit(&node->n_mutex); } /* * smb_node_clear_cached_timestamps * * Decrement count of open ofiles using the cached timestamps. * If the decremented count is zero, clear the cached timestamps. */ static void smb_node_clear_cached_timestamps(smb_node_t *node) { smb_node_t *unode; if ((unode = SMB_IS_STREAM(node)) != NULL) node = unode; mutex_enter(&node->n_mutex); ASSERT(node->n_timestamps.t_open_ofiles > 0); --(node->n_timestamps.t_open_ofiles); if (node->n_timestamps.t_open_ofiles == 0) bzero(&node->n_timestamps, sizeof (smb_times_t)); mutex_exit(&node->n_mutex); } /* * smb_node_get_cached_timestamps * * Overwrite timestamps in attr with those cached in node. */ static void smb_node_get_cached_timestamps(smb_node_t *node, smb_attr_t *attr) { smb_node_t *unode; if ((unode = SMB_IS_STREAM(node)) != NULL) node = unode; mutex_enter(&node->n_mutex); if (node->n_timestamps.t_cached) { attr->sa_vattr.va_mtime = node->n_timestamps.t_mtime; attr->sa_vattr.va_atime = node->n_timestamps.t_atime; attr->sa_vattr.va_ctime = node->n_timestamps.t_ctime; attr->sa_crtime = node->n_timestamps.t_crtime; } mutex_exit(&node->n_mutex); } /* * smb_node_set_cached_timestamps * * Update the node's cached timestamps with values from attr. */ static void smb_node_set_cached_timestamps(smb_node_t *node, smb_attr_t *attr) { smb_node_t *unode; if ((unode = SMB_IS_STREAM(node)) != NULL) node = unode; mutex_enter(&node->n_mutex); if (node->n_timestamps.t_cached) { if (attr->sa_mask & SMB_AT_MTIME) node->n_timestamps.t_mtime = attr->sa_vattr.va_mtime; if (attr->sa_mask & SMB_AT_ATIME) node->n_timestamps.t_atime = attr->sa_vattr.va_atime; if (attr->sa_mask & SMB_AT_CTIME) node->n_timestamps.t_ctime = attr->sa_vattr.va_ctime; if (attr->sa_mask & SMB_AT_CRTIME) node->n_timestamps.t_crtime = attr->sa_crtime; } mutex_exit(&node->n_mutex); }