35b1a3abd3
Add a new TMPFS_LINK_MAX to use in place of LINK_MAX for link overflow checks and pathconf() reporting. Rather than storing a full 64-bit link count, just use a plain int and use INT_MAX as TMPFS_LINK_MAX. Discussed with: bde Reviewed by: kib (part of a larger patch) Sponsored by: Chelsio Communications
536 lines
17 KiB
C
536 lines
17 KiB
C
/* $NetBSD: tmpfs.h,v 1.26 2007/02/22 06:37:00 thorpej Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-NetBSD
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*
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* Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal, developed as part of Google's Summer of Code
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* 2005 program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _FS_TMPFS_TMPFS_H_
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#define _FS_TMPFS_TMPFS_H_
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#include <sys/queue.h>
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#include <sys/tree.h>
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#ifdef _SYS_MALLOC_H_
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MALLOC_DECLARE(M_TMPFSMNT);
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MALLOC_DECLARE(M_TMPFSNAME);
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#endif
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/*
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* Internal representation of a tmpfs directory entry.
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*/
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LIST_HEAD(tmpfs_dir_duphead, tmpfs_dirent);
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struct tmpfs_dirent {
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/*
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* Depending on td_cookie flag entry can be of 3 types:
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* - regular -- no hash collisions, stored in RB-Tree
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* - duphead -- synthetic linked list head for dup entries
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* - dup -- stored in linked list instead of RB-Tree
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*/
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union {
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/* regular and duphead entry types */
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RB_ENTRY(tmpfs_dirent) td_entries;
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/* dup entry type */
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struct {
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LIST_ENTRY(tmpfs_dirent) entries;
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LIST_ENTRY(tmpfs_dirent) index_entries;
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} td_dup;
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} uh;
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uint32_t td_cookie;
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uint32_t td_hash;
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u_int td_namelen;
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/*
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* Pointer to the node this entry refers to. In case this field
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* is NULL, the node is a whiteout.
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*/
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struct tmpfs_node * td_node;
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union {
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/*
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* The name of the entry, allocated from a string pool. This
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* string is not required to be zero-terminated.
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*/
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char * td_name; /* regular, dup */
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struct tmpfs_dir_duphead td_duphead; /* duphead */
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} ud;
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};
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/*
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* A directory in tmpfs holds a collection of directory entries, which
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* in turn point to other files (which can be directories themselves).
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*
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* In tmpfs, this collection is managed by a RB-Tree, whose head is
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* defined by the struct tmpfs_dir type.
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*
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* It is important to notice that directories do not have entries for . and
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* .. as other file systems do. These can be generated when requested
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* based on information available by other means, such as the pointer to
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* the node itself in the former case or the pointer to the parent directory
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* in the latter case. This is done to simplify tmpfs's code and, more
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* importantly, to remove redundancy.
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*/
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RB_HEAD(tmpfs_dir, tmpfs_dirent);
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/*
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* Each entry in a directory has a cookie that identifies it. Cookies
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* supersede offsets within directories because, given how tmpfs stores
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* directories in memory, there is no such thing as an offset.
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*
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* The '.', '..' and the end of directory markers have fixed cookies which
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* cannot collide with the cookies generated by other entries. The cookies
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* for the other entries are generated based on the file name hash value or
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* unique number in case of name hash collision.
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*
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* To preserve compatibility cookies are limited to 31 bits.
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*/
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#define TMPFS_DIRCOOKIE_DOT 0
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#define TMPFS_DIRCOOKIE_DOTDOT 1
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#define TMPFS_DIRCOOKIE_EOF 2
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#define TMPFS_DIRCOOKIE_MASK ((off_t)0x3fffffffU)
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#define TMPFS_DIRCOOKIE_MIN ((off_t)0x00000004U)
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#define TMPFS_DIRCOOKIE_DUP ((off_t)0x40000000U)
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#define TMPFS_DIRCOOKIE_DUPHEAD ((off_t)0x80000000U)
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#define TMPFS_DIRCOOKIE_DUP_MIN TMPFS_DIRCOOKIE_DUP
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#define TMPFS_DIRCOOKIE_DUP_MAX \
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(TMPFS_DIRCOOKIE_DUP | TMPFS_DIRCOOKIE_MASK)
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/*
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* Internal representation of a tmpfs file system node.
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*
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* This structure is splitted in two parts: one holds attributes common
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* to all file types and the other holds data that is only applicable to
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* a particular type. The code must be careful to only access those
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* attributes that are actually allowed by the node's type.
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*
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* Below is the key of locks used to protected the fields in the following
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* structures.
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* (v) vnode lock in exclusive mode
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* (vi) vnode lock in exclusive mode, or vnode lock in shared vnode and
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* tn_interlock
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* (i) tn_interlock
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* (m) tmpfs_mount tm_allnode_lock
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* (c) stable after creation
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*/
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struct tmpfs_node {
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/*
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* Doubly-linked list entry which links all existing nodes for
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* a single file system. This is provided to ease the removal
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* of all nodes during the unmount operation, and to support
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* the implementation of VOP_VNTOCNP(). tn_attached is false
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* when the node is removed from list and unlocked.
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*/
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LIST_ENTRY(tmpfs_node) tn_entries; /* (m) */
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bool tn_attached; /* (m) */
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/*
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* The node's type. Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO',
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* 'VLNK', 'VREG' and 'VSOCK' is allowed. The usage of vnode
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* types instead of a custom enumeration is to make things simpler
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* and faster, as we do not need to convert between two types.
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*/
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enum vtype tn_type; /* (c) */
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/* Node identifier. */
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ino_t tn_id; /* (c) */
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/*
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* Node's internal status. This is used by several file system
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* operations to do modifications to the node in a delayed
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* fashion.
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*/
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int tn_status; /* (vi) */
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#define TMPFS_NODE_ACCESSED (1 << 1)
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#define TMPFS_NODE_MODIFIED (1 << 2)
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#define TMPFS_NODE_CHANGED (1 << 3)
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/*
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* The node size. It does not necessarily match the real amount
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* of memory consumed by it.
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*/
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off_t tn_size; /* (v) */
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/* Generic node attributes. */
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uid_t tn_uid; /* (v) */
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gid_t tn_gid; /* (v) */
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mode_t tn_mode; /* (v) */
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int tn_links; /* (v) */
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u_long tn_flags; /* (v) */
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struct timespec tn_atime; /* (vi) */
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struct timespec tn_mtime; /* (vi) */
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struct timespec tn_ctime; /* (vi) */
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struct timespec tn_birthtime; /* (v) */
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unsigned long tn_gen; /* (c) */
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/*
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* As there is a single vnode for each active file within the
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* system, care has to be taken to avoid allocating more than one
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* vnode per file. In order to do this, a bidirectional association
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* is kept between vnodes and nodes.
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*
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* Whenever a vnode is allocated, its v_data field is updated to
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* point to the node it references. At the same time, the node's
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* tn_vnode field is modified to point to the new vnode representing
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* it. Further attempts to allocate a vnode for this same node will
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* result in returning a new reference to the value stored in
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* tn_vnode.
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*
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* May be NULL when the node is unused (that is, no vnode has been
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* allocated for it or it has been reclaimed).
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*/
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struct vnode * tn_vnode; /* (i) */
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/*
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* Interlock to protect tn_vpstate, and tn_status under shared
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* vnode lock.
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*/
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struct mtx tn_interlock;
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/*
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* Identify if current node has vnode assiocate with
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* or allocating vnode.
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*/
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int tn_vpstate; /* (i) */
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/* Transient refcounter on this node. */
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u_int tn_refcount; /* (m) + (i) */
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/* misc data field for different tn_type node */
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union {
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/* Valid when tn_type == VBLK || tn_type == VCHR. */
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dev_t tn_rdev; /* (c) */
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/* Valid when tn_type == VDIR. */
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struct tn_dir {
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/*
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* Pointer to the parent directory. The root
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* directory has a pointer to itself in this field;
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* this property identifies the root node.
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*/
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struct tmpfs_node * tn_parent;
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/*
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* Head of a tree that links the contents of
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* the directory together.
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*/
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struct tmpfs_dir tn_dirhead;
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/*
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* Head of a list the contains fake directory entries
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* heads, i.e. entries with TMPFS_DIRCOOKIE_DUPHEAD
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* flag.
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*/
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struct tmpfs_dir_duphead tn_dupindex;
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/*
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* Number and pointer of the first directory entry
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* returned by the readdir operation if it were
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* called again to continue reading data from the
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* same directory as before. This is used to speed
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* up reads of long directories, assuming that no
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* more than one read is in progress at a given time.
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* Otherwise, these values are discarded.
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*/
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off_t tn_readdir_lastn;
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struct tmpfs_dirent * tn_readdir_lastp;
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} tn_dir;
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/* Valid when tn_type == VLNK. */
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/* The link's target, allocated from a string pool. */
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char * tn_link; /* (c) */
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/* Valid when tn_type == VREG. */
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struct tn_reg {
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/*
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* The contents of regular files stored in a
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* tmpfs file system are represented by a
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* single anonymous memory object (aobj, for
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* short). The aobj provides direct access to
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* any position within the file. It is a task
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* of the memory management subsystem to issue
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* the required page ins or page outs whenever
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* a position within the file is accessed.
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*/
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vm_object_t tn_aobj; /* (c) */
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} tn_reg;
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} tn_spec; /* (v) */
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};
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LIST_HEAD(tmpfs_node_list, tmpfs_node);
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#define tn_rdev tn_spec.tn_rdev
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#define tn_dir tn_spec.tn_dir
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#define tn_link tn_spec.tn_link
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#define tn_reg tn_spec.tn_reg
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#define tn_fifo tn_spec.tn_fifo
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#define TMPFS_LINK_MAX INT_MAX
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#define TMPFS_NODE_LOCK(node) mtx_lock(&(node)->tn_interlock)
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#define TMPFS_NODE_UNLOCK(node) mtx_unlock(&(node)->tn_interlock)
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#define TMPFS_NODE_MTX(node) (&(node)->tn_interlock)
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#define TMPFS_NODE_ASSERT_LOCKED(node) mtx_assert(TMPFS_NODE_MTX(node), \
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MA_OWNED)
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#ifdef INVARIANTS
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#define TMPFS_ASSERT_LOCKED(node) do { \
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MPASS((node) != NULL); \
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MPASS((node)->tn_vnode != NULL); \
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ASSERT_VOP_LOCKED((node)->tn_vnode, "tmpfs assert"); \
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} while (0)
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#else
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#define TMPFS_ASSERT_LOCKED(node) (void)0
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#endif
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#define TMPFS_VNODE_ALLOCATING 1
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#define TMPFS_VNODE_WANT 2
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#define TMPFS_VNODE_DOOMED 4
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#define TMPFS_VNODE_WRECLAIM 8
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/*
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* Internal representation of a tmpfs mount point.
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*/
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struct tmpfs_mount {
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/*
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* Maximum number of memory pages available for use by the file
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* system, set during mount time. This variable must never be
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* used directly as it may be bigger than the current amount of
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* free memory; in the extreme case, it will hold the ULONG_MAX
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* value.
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*/
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u_long tm_pages_max;
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/* Number of pages in use by the file system. */
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u_long tm_pages_used;
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/*
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* Pointer to the node representing the root directory of this
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* file system.
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*/
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struct tmpfs_node * tm_root;
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/*
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* Maximum number of possible nodes for this file system; set
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* during mount time. We need a hard limit on the maximum number
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* of nodes to avoid allocating too much of them; their objects
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* cannot be released until the file system is unmounted.
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* Otherwise, we could easily run out of memory by creating lots
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* of empty files and then simply removing them.
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*/
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ino_t tm_nodes_max;
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/* unrhdr used to allocate inode numbers */
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struct unrhdr * tm_ino_unr;
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/* Number of nodes currently that are in use. */
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ino_t tm_nodes_inuse;
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/* Refcounter on this struct tmpfs_mount. */
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uint64_t tm_refcount;
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/* maximum representable file size */
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u_int64_t tm_maxfilesize;
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/*
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* The used list contains all nodes that are currently used by
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* the file system; i.e., they refer to existing files.
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*/
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struct tmpfs_node_list tm_nodes_used;
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/* All node lock to protect the node list and tmp_pages_used. */
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struct mtx tm_allnode_lock;
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/* Zones used to store file system meta data, per tmpfs mount. */
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uma_zone_t tm_dirent_pool;
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uma_zone_t tm_node_pool;
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/* Read-only status. */
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bool tm_ronly;
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/* Do not use namecache. */
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bool tm_nonc;
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};
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#define TMPFS_LOCK(tm) mtx_lock(&(tm)->tm_allnode_lock)
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#define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->tm_allnode_lock)
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#define TMPFS_MP_ASSERT_LOCKED(tm) mtx_assert(&(tm)->tm_allnode_lock, MA_OWNED)
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/*
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* This structure maps a file identifier to a tmpfs node. Used by the
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* NFS code.
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*/
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struct tmpfs_fid {
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uint16_t tf_len;
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uint16_t tf_pad;
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ino_t tf_id;
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unsigned long tf_gen;
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};
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struct tmpfs_dir_cursor {
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struct tmpfs_dirent *tdc_current;
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struct tmpfs_dirent *tdc_tree;
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};
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#ifdef _KERNEL
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/*
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* Prototypes for tmpfs_subr.c.
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*/
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void tmpfs_ref_node(struct tmpfs_node *node);
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void tmpfs_ref_node_locked(struct tmpfs_node *node);
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int tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *, enum vtype,
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uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *,
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char *, dev_t, struct tmpfs_node **);
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void tmpfs_free_node(struct tmpfs_mount *, struct tmpfs_node *);
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bool tmpfs_free_node_locked(struct tmpfs_mount *, struct tmpfs_node *, bool);
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void tmpfs_free_tmp(struct tmpfs_mount *);
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int tmpfs_alloc_dirent(struct tmpfs_mount *, struct tmpfs_node *,
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const char *, u_int, struct tmpfs_dirent **);
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void tmpfs_free_dirent(struct tmpfs_mount *, struct tmpfs_dirent *);
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void tmpfs_dirent_init(struct tmpfs_dirent *, const char *, u_int);
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void tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj);
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int tmpfs_alloc_vp(struct mount *, struct tmpfs_node *, int,
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struct vnode **);
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void tmpfs_free_vp(struct vnode *);
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int tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *,
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struct componentname *, char *);
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void tmpfs_check_mtime(struct vnode *);
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void tmpfs_dir_attach(struct vnode *, struct tmpfs_dirent *);
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void tmpfs_dir_detach(struct vnode *, struct tmpfs_dirent *);
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void tmpfs_dir_destroy(struct tmpfs_mount *, struct tmpfs_node *);
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struct tmpfs_dirent * tmpfs_dir_lookup(struct tmpfs_node *node,
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struct tmpfs_node *f,
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struct componentname *cnp);
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int tmpfs_dir_getdents(struct tmpfs_node *, struct uio *, int,
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u_long *, int *);
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int tmpfs_dir_whiteout_add(struct vnode *, struct componentname *);
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void tmpfs_dir_whiteout_remove(struct vnode *, struct componentname *);
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int tmpfs_reg_resize(struct vnode *, off_t, boolean_t);
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int tmpfs_chflags(struct vnode *, u_long, struct ucred *, struct thread *);
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int tmpfs_chmod(struct vnode *, mode_t, struct ucred *, struct thread *);
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int tmpfs_chown(struct vnode *, uid_t, gid_t, struct ucred *,
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struct thread *);
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int tmpfs_chsize(struct vnode *, u_quad_t, struct ucred *, struct thread *);
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int tmpfs_chtimes(struct vnode *, struct vattr *, struct ucred *cred,
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struct thread *);
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void tmpfs_itimes(struct vnode *, const struct timespec *,
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const struct timespec *);
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void tmpfs_set_status(struct tmpfs_node *node, int status);
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void tmpfs_update(struct vnode *);
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int tmpfs_truncate(struct vnode *, off_t);
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struct tmpfs_dirent *tmpfs_dir_first(struct tmpfs_node *dnode,
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struct tmpfs_dir_cursor *dc);
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struct tmpfs_dirent *tmpfs_dir_next(struct tmpfs_node *dnode,
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struct tmpfs_dir_cursor *dc);
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/*
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* Convenience macros to simplify some logical expressions.
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*/
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#define IMPLIES(a, b) (!(a) || (b))
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#define IFF(a, b) (IMPLIES(a, b) && IMPLIES(b, a))
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/*
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* Checks that the directory entry pointed by 'de' matches the name 'name'
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* with a length of 'len'.
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*/
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|
#define TMPFS_DIRENT_MATCHES(de, name, len) \
|
|
(de->td_namelen == len && \
|
|
bcmp((de)->ud.td_name, (name), (de)->td_namelen) == 0)
|
|
|
|
/*
|
|
* Ensures that the node pointed by 'node' is a directory and that its
|
|
* contents are consistent with respect to directories.
|
|
*/
|
|
#define TMPFS_VALIDATE_DIR(node) do { \
|
|
MPASS((node)->tn_type == VDIR); \
|
|
MPASS((node)->tn_size % sizeof(struct tmpfs_dirent) == 0); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Amount of memory pages to reserve for the system (e.g., to not use by
|
|
* tmpfs).
|
|
*/
|
|
#define TMPFS_PAGES_MINRESERVED (4 * 1024 * 1024 / PAGE_SIZE)
|
|
|
|
size_t tmpfs_mem_avail(void);
|
|
|
|
size_t tmpfs_pages_used(struct tmpfs_mount *tmp);
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Macros/functions to convert from generic data structures to tmpfs
|
|
* specific ones.
|
|
*/
|
|
|
|
static inline struct tmpfs_mount *
|
|
VFS_TO_TMPFS(struct mount *mp)
|
|
{
|
|
struct tmpfs_mount *tmp;
|
|
|
|
MPASS(mp != NULL && mp->mnt_data != NULL);
|
|
tmp = (struct tmpfs_mount *)mp->mnt_data;
|
|
return (tmp);
|
|
}
|
|
|
|
static inline struct tmpfs_node *
|
|
VP_TO_TMPFS_NODE(struct vnode *vp)
|
|
{
|
|
struct tmpfs_node *node;
|
|
|
|
MPASS(vp != NULL && vp->v_data != NULL);
|
|
node = (struct tmpfs_node *)vp->v_data;
|
|
return (node);
|
|
}
|
|
|
|
static inline struct tmpfs_node *
|
|
VP_TO_TMPFS_DIR(struct vnode *vp)
|
|
{
|
|
struct tmpfs_node *node;
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
TMPFS_VALIDATE_DIR(node);
|
|
return (node);
|
|
}
|
|
|
|
static inline bool
|
|
tmpfs_use_nc(struct vnode *vp)
|
|
{
|
|
|
|
return (!(VFS_TO_TMPFS(vp->v_mount)->tm_nonc));
|
|
}
|
|
|
|
#endif /* _FS_TMPFS_TMPFS_H_ */
|