bba7ed2054
Edit comments which explain no longer relevant details, and add locking annotations to the struct tmpfs_node members. Tested by: pho (as part of the larger patch) Sponsored by: The FreeBSD Foundation MFC after: 1 week
1818 lines
46 KiB
C
1818 lines
46 KiB
C
/* $NetBSD: tmpfs_subr.c,v 1.35 2007/07/09 21:10:50 ad Exp $ */
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/*-
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* Copyright (c) 2005 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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/*
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* Efficient memory file system supporting functions.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/fnv_hash.h>
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#include <sys/lock.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/random.h>
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#include <sys/rwlock.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/vmmeter.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_extern.h>
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#include <fs/tmpfs/tmpfs.h>
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#include <fs/tmpfs/tmpfs_fifoops.h>
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#include <fs/tmpfs/tmpfs_vnops.h>
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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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SYSCTL_NODE(_vfs, OID_AUTO, tmpfs, CTLFLAG_RW, 0, "tmpfs file system");
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static long tmpfs_pages_reserved = TMPFS_PAGES_MINRESERVED;
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static int
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sysctl_mem_reserved(SYSCTL_HANDLER_ARGS)
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{
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int error;
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long pages, bytes;
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pages = *(long *)arg1;
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bytes = pages * PAGE_SIZE;
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error = sysctl_handle_long(oidp, &bytes, 0, req);
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if (error || !req->newptr)
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return (error);
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pages = bytes / PAGE_SIZE;
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if (pages < TMPFS_PAGES_MINRESERVED)
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return (EINVAL);
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*(long *)arg1 = pages;
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return (0);
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}
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SYSCTL_PROC(_vfs_tmpfs, OID_AUTO, memory_reserved, CTLTYPE_LONG|CTLFLAG_RW,
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&tmpfs_pages_reserved, 0, sysctl_mem_reserved, "L",
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"Amount of available memory and swap below which tmpfs growth stops");
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static __inline int tmpfs_dirtree_cmp(struct tmpfs_dirent *a,
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struct tmpfs_dirent *b);
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RB_PROTOTYPE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);
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size_t
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tmpfs_mem_avail(void)
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{
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vm_ooffset_t avail;
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avail = swap_pager_avail + vm_cnt.v_free_count - tmpfs_pages_reserved;
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if (__predict_false(avail < 0))
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avail = 0;
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return (avail);
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}
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size_t
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tmpfs_pages_used(struct tmpfs_mount *tmp)
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{
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const size_t node_size = sizeof(struct tmpfs_node) +
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sizeof(struct tmpfs_dirent);
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size_t meta_pages;
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meta_pages = howmany((uintmax_t)tmp->tm_nodes_inuse * node_size,
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PAGE_SIZE);
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return (meta_pages + tmp->tm_pages_used);
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}
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static size_t
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tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages)
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{
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if (tmpfs_mem_avail() < req_pages)
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return (0);
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if (tmp->tm_pages_max != ULONG_MAX &&
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tmp->tm_pages_max < req_pages + tmpfs_pages_used(tmp))
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return (0);
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return (1);
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}
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/*
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* Allocates a new node of type 'type' inside the 'tmp' mount point, with
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* its owner set to 'uid', its group to 'gid' and its mode set to 'mode',
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* using the credentials of the process 'p'.
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*
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* If the node type is set to 'VDIR', then the parent parameter must point
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* to the parent directory of the node being created. It may only be NULL
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* while allocating the root node.
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*
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* If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter
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* specifies the device the node represents.
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*
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* If the node type is set to 'VLNK', then the parameter target specifies
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* the file name of the target file for the symbolic link that is being
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* created.
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*
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* Note that new nodes are retrieved from the available list if it has
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* items or, if it is empty, from the node pool as long as there is enough
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* space to create them.
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*
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* Returns zero on success or an appropriate error code on failure.
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*/
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int
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tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *tmp, enum vtype type,
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uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *parent,
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char *target, dev_t rdev, struct tmpfs_node **node)
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{
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struct tmpfs_node *nnode;
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vm_object_t obj;
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/* If the root directory of the 'tmp' file system is not yet
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* allocated, this must be the request to do it. */
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MPASS(IMPLIES(tmp->tm_root == NULL, parent == NULL && type == VDIR));
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KASSERT(tmp->tm_root == NULL || mp->mnt_writeopcount > 0,
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("creating node not under vn_start_write"));
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MPASS(IFF(type == VLNK, target != NULL));
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MPASS(IFF(type == VBLK || type == VCHR, rdev != VNOVAL));
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if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max)
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return (ENOSPC);
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if (tmpfs_pages_check_avail(tmp, 1) == 0)
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return (ENOSPC);
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if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
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/*
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* When a new tmpfs node is created for fully
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* constructed mount point, there must be a parent
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* node, which vnode is locked exclusively. As
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* consequence, if the unmount is executing in
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* parallel, vflush() cannot reclaim the parent vnode.
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* Due to this, the check for MNTK_UNMOUNT flag is not
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* racy: if we did not see MNTK_UNMOUNT flag, then tmp
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* cannot be destroyed until node construction is
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* finished and the parent vnode unlocked.
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*
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* Tmpfs does not need to instantiate new nodes during
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* unmount.
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*/
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return (EBUSY);
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}
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nnode = (struct tmpfs_node *)uma_zalloc_arg(tmp->tm_node_pool, tmp,
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M_WAITOK);
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/* Generic initialization. */
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nnode->tn_type = type;
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vfs_timestamp(&nnode->tn_atime);
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nnode->tn_birthtime = nnode->tn_ctime = nnode->tn_mtime =
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nnode->tn_atime;
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nnode->tn_uid = uid;
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nnode->tn_gid = gid;
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nnode->tn_mode = mode;
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nnode->tn_id = alloc_unr(tmp->tm_ino_unr);
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/* Type-specific initialization. */
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switch (nnode->tn_type) {
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case VBLK:
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case VCHR:
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nnode->tn_rdev = rdev;
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break;
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case VDIR:
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RB_INIT(&nnode->tn_dir.tn_dirhead);
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LIST_INIT(&nnode->tn_dir.tn_dupindex);
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MPASS(parent != nnode);
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MPASS(IMPLIES(parent == NULL, tmp->tm_root == NULL));
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nnode->tn_dir.tn_parent = (parent == NULL) ? nnode : parent;
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nnode->tn_dir.tn_readdir_lastn = 0;
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nnode->tn_dir.tn_readdir_lastp = NULL;
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nnode->tn_links++;
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TMPFS_NODE_LOCK(nnode->tn_dir.tn_parent);
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nnode->tn_dir.tn_parent->tn_links++;
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TMPFS_NODE_UNLOCK(nnode->tn_dir.tn_parent);
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break;
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case VFIFO:
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/* FALLTHROUGH */
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case VSOCK:
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break;
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case VLNK:
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MPASS(strlen(target) < MAXPATHLEN);
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nnode->tn_size = strlen(target);
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nnode->tn_link = malloc(nnode->tn_size, M_TMPFSNAME,
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M_WAITOK);
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memcpy(nnode->tn_link, target, nnode->tn_size);
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break;
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case VREG:
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obj = nnode->tn_reg.tn_aobj =
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vm_pager_allocate(OBJT_SWAP, NULL, 0, VM_PROT_DEFAULT, 0,
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NULL /* XXXKIB - tmpfs needs swap reservation */);
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VM_OBJECT_WLOCK(obj);
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/* OBJ_TMPFS is set together with the setting of vp->v_object */
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vm_object_set_flag(obj, OBJ_NOSPLIT | OBJ_TMPFS_NODE);
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vm_object_clear_flag(obj, OBJ_ONEMAPPING);
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VM_OBJECT_WUNLOCK(obj);
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break;
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default:
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panic("tmpfs_alloc_node: type %p %d", nnode,
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(int)nnode->tn_type);
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}
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TMPFS_LOCK(tmp);
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LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries);
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tmp->tm_nodes_inuse++;
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TMPFS_UNLOCK(tmp);
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*node = nnode;
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return (0);
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}
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/*
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* Destroys the node pointed to by node from the file system 'tmp'.
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* If the node references a directory, no entries are allowed.
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*/
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void
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tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node)
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{
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vm_object_t uobj;
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#ifdef INVARIANTS
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TMPFS_NODE_LOCK(node);
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MPASS(node->tn_vnode == NULL);
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MPASS((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0);
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TMPFS_NODE_UNLOCK(node);
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#endif
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TMPFS_LOCK(tmp);
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LIST_REMOVE(node, tn_entries);
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tmp->tm_nodes_inuse--;
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TMPFS_UNLOCK(tmp);
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switch (node->tn_type) {
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case VNON:
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/* Do not do anything. VNON is provided to let the
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* allocation routine clean itself easily by avoiding
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* duplicating code in it. */
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/* FALLTHROUGH */
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case VBLK:
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/* FALLTHROUGH */
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case VCHR:
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/* FALLTHROUGH */
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case VDIR:
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/* FALLTHROUGH */
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case VFIFO:
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/* FALLTHROUGH */
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case VSOCK:
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break;
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case VLNK:
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free(node->tn_link, M_TMPFSNAME);
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break;
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case VREG:
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uobj = node->tn_reg.tn_aobj;
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if (uobj != NULL) {
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atomic_subtract_long(&tmp->tm_pages_used, uobj->size);
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KASSERT((uobj->flags & OBJ_TMPFS) == 0,
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("leaked OBJ_TMPFS node %p vm_obj %p", node, uobj));
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vm_object_deallocate(uobj);
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}
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break;
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default:
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panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type);
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}
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free_unr(tmp->tm_ino_unr, node->tn_id);
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uma_zfree(tmp->tm_node_pool, node);
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}
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static __inline uint32_t
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tmpfs_dirent_hash(const char *name, u_int len)
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{
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uint32_t hash;
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hash = fnv_32_buf(name, len, FNV1_32_INIT + len) & TMPFS_DIRCOOKIE_MASK;
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#ifdef TMPFS_DEBUG_DIRCOOKIE_DUP
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hash &= 0xf;
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#endif
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if (hash < TMPFS_DIRCOOKIE_MIN)
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hash += TMPFS_DIRCOOKIE_MIN;
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return (hash);
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}
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static __inline off_t
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tmpfs_dirent_cookie(struct tmpfs_dirent *de)
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{
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if (de == NULL)
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return (TMPFS_DIRCOOKIE_EOF);
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MPASS(de->td_cookie >= TMPFS_DIRCOOKIE_MIN);
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return (de->td_cookie);
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}
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static __inline boolean_t
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tmpfs_dirent_dup(struct tmpfs_dirent *de)
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{
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return ((de->td_cookie & TMPFS_DIRCOOKIE_DUP) != 0);
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}
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static __inline boolean_t
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tmpfs_dirent_duphead(struct tmpfs_dirent *de)
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{
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return ((de->td_cookie & TMPFS_DIRCOOKIE_DUPHEAD) != 0);
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}
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void
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tmpfs_dirent_init(struct tmpfs_dirent *de, const char *name, u_int namelen)
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{
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de->td_hash = de->td_cookie = tmpfs_dirent_hash(name, namelen);
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memcpy(de->ud.td_name, name, namelen);
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de->td_namelen = namelen;
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}
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/*
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* Allocates a new directory entry for the node node with a name of name.
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* The new directory entry is returned in *de.
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*
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* The link count of node is increased by one to reflect the new object
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* referencing it.
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*
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* Returns zero on success or an appropriate error code on failure.
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*/
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int
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tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node,
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const char *name, u_int len, struct tmpfs_dirent **de)
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{
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struct tmpfs_dirent *nde;
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nde = uma_zalloc(tmp->tm_dirent_pool, M_WAITOK);
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nde->td_node = node;
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if (name != NULL) {
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nde->ud.td_name = malloc(len, M_TMPFSNAME, M_WAITOK);
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tmpfs_dirent_init(nde, name, len);
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} else
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nde->td_namelen = 0;
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if (node != NULL)
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node->tn_links++;
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*de = nde;
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return 0;
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}
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/*
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* Frees a directory entry. It is the caller's responsibility to destroy
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* the node referenced by it if needed.
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*
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* The link count of node is decreased by one to reflect the removal of an
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* object that referenced it. This only happens if 'node_exists' is true;
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* otherwise the function will not access the node referred to by the
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* directory entry, as it may already have been released from the outside.
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*/
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void
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tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de)
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{
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struct tmpfs_node *node;
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node = de->td_node;
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if (node != NULL) {
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MPASS(node->tn_links > 0);
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node->tn_links--;
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}
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if (!tmpfs_dirent_duphead(de) && de->ud.td_name != NULL)
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free(de->ud.td_name, M_TMPFSNAME);
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uma_zfree(tmp->tm_dirent_pool, de);
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}
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void
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tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj)
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{
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ASSERT_VOP_ELOCKED(vp, "tmpfs_destroy_vobject");
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if (vp->v_type != VREG || obj == NULL)
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return;
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VM_OBJECT_WLOCK(obj);
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VI_LOCK(vp);
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vm_object_clear_flag(obj, OBJ_TMPFS);
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obj->un_pager.swp.swp_tmpfs = NULL;
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VI_UNLOCK(vp);
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VM_OBJECT_WUNLOCK(obj);
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}
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/*
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* Need to clear v_object for insmntque failure.
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*/
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static void
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tmpfs_insmntque_dtr(struct vnode *vp, void *dtr_arg)
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{
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tmpfs_destroy_vobject(vp, vp->v_object);
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vp->v_object = NULL;
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vp->v_data = NULL;
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vp->v_op = &dead_vnodeops;
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vgone(vp);
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vput(vp);
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}
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/*
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* Allocates a new vnode for the node node or returns a new reference to
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* an existing one if the node had already a vnode referencing it. The
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* resulting locked vnode is returned in *vpp.
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*
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* Returns zero on success or an appropriate error code on failure.
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*/
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int
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tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag,
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struct vnode **vpp)
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{
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struct vnode *vp;
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vm_object_t object;
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int error;
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error = 0;
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loop:
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TMPFS_NODE_LOCK(node);
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loop1:
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if ((vp = node->tn_vnode) != NULL) {
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MPASS((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0);
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VI_LOCK(vp);
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if ((node->tn_type == VDIR && node->tn_dir.tn_parent == NULL) ||
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((vp->v_iflag & VI_DOOMED) != 0 &&
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(lkflag & LK_NOWAIT) != 0)) {
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VI_UNLOCK(vp);
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TMPFS_NODE_UNLOCK(node);
|
|
error = ENOENT;
|
|
vp = NULL;
|
|
goto out;
|
|
}
|
|
if ((vp->v_iflag & VI_DOOMED) != 0) {
|
|
VI_UNLOCK(vp);
|
|
node->tn_vpstate |= TMPFS_VNODE_WRECLAIM;
|
|
while ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0) {
|
|
msleep(&node->tn_vnode, TMPFS_NODE_MTX(node),
|
|
0, "tmpfsE", 0);
|
|
}
|
|
goto loop1;
|
|
}
|
|
TMPFS_NODE_UNLOCK(node);
|
|
error = vget(vp, lkflag | LK_INTERLOCK, curthread);
|
|
if (error == ENOENT)
|
|
goto loop;
|
|
if (error != 0) {
|
|
vp = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Make sure the vnode is still there after
|
|
* getting the interlock to avoid racing a free.
|
|
*/
|
|
if (node->tn_vnode == NULL || node->tn_vnode != vp) {
|
|
vput(vp);
|
|
goto loop;
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
|
|
if ((node->tn_vpstate & TMPFS_VNODE_DOOMED) ||
|
|
(node->tn_type == VDIR && node->tn_dir.tn_parent == NULL)) {
|
|
TMPFS_NODE_UNLOCK(node);
|
|
error = ENOENT;
|
|
vp = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* otherwise lock the vp list while we call getnewvnode
|
|
* since that can block.
|
|
*/
|
|
if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) {
|
|
node->tn_vpstate |= TMPFS_VNODE_WANT;
|
|
error = msleep((caddr_t) &node->tn_vpstate,
|
|
TMPFS_NODE_MTX(node), PDROP | PCATCH,
|
|
"tmpfs_alloc_vp", 0);
|
|
if (error)
|
|
return error;
|
|
|
|
goto loop;
|
|
} else
|
|
node->tn_vpstate |= TMPFS_VNODE_ALLOCATING;
|
|
|
|
TMPFS_NODE_UNLOCK(node);
|
|
|
|
/* Get a new vnode and associate it with our node. */
|
|
error = getnewvnode("tmpfs", mp, &tmpfs_vnodeop_entries, &vp);
|
|
if (error != 0)
|
|
goto unlock;
|
|
MPASS(vp != NULL);
|
|
|
|
/* lkflag is ignored, the lock is exclusive */
|
|
(void) vn_lock(vp, lkflag | LK_RETRY);
|
|
|
|
vp->v_data = node;
|
|
vp->v_type = node->tn_type;
|
|
|
|
/* Type-specific initialization. */
|
|
switch (node->tn_type) {
|
|
case VBLK:
|
|
/* FALLTHROUGH */
|
|
case VCHR:
|
|
/* FALLTHROUGH */
|
|
case VLNK:
|
|
/* FALLTHROUGH */
|
|
case VSOCK:
|
|
break;
|
|
case VFIFO:
|
|
vp->v_op = &tmpfs_fifoop_entries;
|
|
break;
|
|
case VREG:
|
|
object = node->tn_reg.tn_aobj;
|
|
VM_OBJECT_WLOCK(object);
|
|
VI_LOCK(vp);
|
|
KASSERT(vp->v_object == NULL, ("Not NULL v_object in tmpfs"));
|
|
vp->v_object = object;
|
|
object->un_pager.swp.swp_tmpfs = vp;
|
|
vm_object_set_flag(object, OBJ_TMPFS);
|
|
VI_UNLOCK(vp);
|
|
VM_OBJECT_WUNLOCK(object);
|
|
break;
|
|
case VDIR:
|
|
MPASS(node->tn_dir.tn_parent != NULL);
|
|
if (node->tn_dir.tn_parent == node)
|
|
vp->v_vflag |= VV_ROOT;
|
|
break;
|
|
|
|
default:
|
|
panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type);
|
|
}
|
|
if (vp->v_type != VFIFO)
|
|
VN_LOCK_ASHARE(vp);
|
|
|
|
error = insmntque1(vp, mp, tmpfs_insmntque_dtr, NULL);
|
|
if (error != 0)
|
|
vp = NULL;
|
|
|
|
unlock:
|
|
TMPFS_NODE_LOCK(node);
|
|
|
|
MPASS(node->tn_vpstate & TMPFS_VNODE_ALLOCATING);
|
|
node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING;
|
|
node->tn_vnode = vp;
|
|
|
|
if (node->tn_vpstate & TMPFS_VNODE_WANT) {
|
|
node->tn_vpstate &= ~TMPFS_VNODE_WANT;
|
|
TMPFS_NODE_UNLOCK(node);
|
|
wakeup((caddr_t) &node->tn_vpstate);
|
|
} else
|
|
TMPFS_NODE_UNLOCK(node);
|
|
|
|
out:
|
|
*vpp = vp;
|
|
|
|
#ifdef INVARIANTS
|
|
if (error == 0) {
|
|
MPASS(*vpp != NULL && VOP_ISLOCKED(*vpp));
|
|
TMPFS_NODE_LOCK(node);
|
|
MPASS(*vpp == node->tn_vnode);
|
|
TMPFS_NODE_UNLOCK(node);
|
|
}
|
|
#endif
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Destroys the association between the vnode vp and the node it
|
|
* references.
|
|
*/
|
|
void
|
|
tmpfs_free_vp(struct vnode *vp)
|
|
{
|
|
struct tmpfs_node *node;
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
TMPFS_NODE_ASSERT_LOCKED(node);
|
|
node->tn_vnode = NULL;
|
|
if ((node->tn_vpstate & TMPFS_VNODE_WRECLAIM) != 0)
|
|
wakeup(&node->tn_vnode);
|
|
node->tn_vpstate &= ~TMPFS_VNODE_WRECLAIM;
|
|
vp->v_data = NULL;
|
|
}
|
|
|
|
/*
|
|
* Allocates a new file of type 'type' and adds it to the parent directory
|
|
* 'dvp'; this addition is done using the component name given in 'cnp'.
|
|
* The ownership of the new file is automatically assigned based on the
|
|
* credentials of the caller (through 'cnp'), the group is set based on
|
|
* the parent directory and the mode is determined from the 'vap' argument.
|
|
* If successful, *vpp holds a vnode to the newly created file and zero
|
|
* is returned. Otherwise *vpp is NULL and the function returns an
|
|
* appropriate error code.
|
|
*/
|
|
int
|
|
tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap,
|
|
struct componentname *cnp, char *target)
|
|
{
|
|
int error;
|
|
struct tmpfs_dirent *de;
|
|
struct tmpfs_mount *tmp;
|
|
struct tmpfs_node *dnode;
|
|
struct tmpfs_node *node;
|
|
struct tmpfs_node *parent;
|
|
|
|
MPASS(VOP_ISLOCKED(dvp));
|
|
MPASS(cnp->cn_flags & HASBUF);
|
|
|
|
tmp = VFS_TO_TMPFS(dvp->v_mount);
|
|
dnode = VP_TO_TMPFS_DIR(dvp);
|
|
*vpp = NULL;
|
|
|
|
/* If the entry we are creating is a directory, we cannot overflow
|
|
* the number of links of its parent, because it will get a new
|
|
* link. */
|
|
if (vap->va_type == VDIR) {
|
|
/* Ensure that we do not overflow the maximum number of links
|
|
* imposed by the system. */
|
|
MPASS(dnode->tn_links <= LINK_MAX);
|
|
if (dnode->tn_links == LINK_MAX) {
|
|
return (EMLINK);
|
|
}
|
|
|
|
parent = dnode;
|
|
MPASS(parent != NULL);
|
|
} else
|
|
parent = NULL;
|
|
|
|
/* Allocate a node that represents the new file. */
|
|
error = tmpfs_alloc_node(dvp->v_mount, tmp, vap->va_type,
|
|
cnp->cn_cred->cr_uid, dnode->tn_gid, vap->va_mode, parent,
|
|
target, vap->va_rdev, &node);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/* Allocate a directory entry that points to the new file. */
|
|
error = tmpfs_alloc_dirent(tmp, node, cnp->cn_nameptr, cnp->cn_namelen,
|
|
&de);
|
|
if (error != 0) {
|
|
tmpfs_free_node(tmp, node);
|
|
return (error);
|
|
}
|
|
|
|
/* Allocate a vnode for the new file. */
|
|
error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp);
|
|
if (error != 0) {
|
|
tmpfs_free_dirent(tmp, de);
|
|
tmpfs_free_node(tmp, node);
|
|
return (error);
|
|
}
|
|
|
|
/* Now that all required items are allocated, we can proceed to
|
|
* insert the new node into the directory, an operation that
|
|
* cannot fail. */
|
|
if (cnp->cn_flags & ISWHITEOUT)
|
|
tmpfs_dir_whiteout_remove(dvp, cnp);
|
|
tmpfs_dir_attach(dvp, de);
|
|
return (0);
|
|
}
|
|
|
|
static struct tmpfs_dirent *
|
|
tmpfs_dir_first(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
|
|
{
|
|
struct tmpfs_dirent *de;
|
|
|
|
de = RB_MIN(tmpfs_dir, &dnode->tn_dir.tn_dirhead);
|
|
dc->tdc_tree = de;
|
|
if (de != NULL && tmpfs_dirent_duphead(de))
|
|
de = LIST_FIRST(&de->ud.td_duphead);
|
|
dc->tdc_current = de;
|
|
|
|
return (dc->tdc_current);
|
|
}
|
|
|
|
static struct tmpfs_dirent *
|
|
tmpfs_dir_next(struct tmpfs_node *dnode, struct tmpfs_dir_cursor *dc)
|
|
{
|
|
struct tmpfs_dirent *de;
|
|
|
|
MPASS(dc->tdc_tree != NULL);
|
|
if (tmpfs_dirent_dup(dc->tdc_current)) {
|
|
dc->tdc_current = LIST_NEXT(dc->tdc_current, uh.td_dup.entries);
|
|
if (dc->tdc_current != NULL)
|
|
return (dc->tdc_current);
|
|
}
|
|
dc->tdc_tree = dc->tdc_current = RB_NEXT(tmpfs_dir,
|
|
&dnode->tn_dir.tn_dirhead, dc->tdc_tree);
|
|
if ((de = dc->tdc_current) != NULL && tmpfs_dirent_duphead(de)) {
|
|
dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
|
|
MPASS(dc->tdc_current != NULL);
|
|
}
|
|
|
|
return (dc->tdc_current);
|
|
}
|
|
|
|
/* Lookup directory entry in RB-Tree. Function may return duphead entry. */
|
|
static struct tmpfs_dirent *
|
|
tmpfs_dir_xlookup_hash(struct tmpfs_node *dnode, uint32_t hash)
|
|
{
|
|
struct tmpfs_dirent *de, dekey;
|
|
|
|
dekey.td_hash = hash;
|
|
de = RB_FIND(tmpfs_dir, &dnode->tn_dir.tn_dirhead, &dekey);
|
|
return (de);
|
|
}
|
|
|
|
/* Lookup directory entry by cookie, initialize directory cursor accordingly. */
|
|
static struct tmpfs_dirent *
|
|
tmpfs_dir_lookup_cookie(struct tmpfs_node *node, off_t cookie,
|
|
struct tmpfs_dir_cursor *dc)
|
|
{
|
|
struct tmpfs_dir *dirhead = &node->tn_dir.tn_dirhead;
|
|
struct tmpfs_dirent *de, dekey;
|
|
|
|
MPASS(cookie >= TMPFS_DIRCOOKIE_MIN);
|
|
|
|
if (cookie == node->tn_dir.tn_readdir_lastn &&
|
|
(de = node->tn_dir.tn_readdir_lastp) != NULL) {
|
|
/* Protect against possible race, tn_readdir_last[pn]
|
|
* may be updated with only shared vnode lock held. */
|
|
if (cookie == tmpfs_dirent_cookie(de))
|
|
goto out;
|
|
}
|
|
|
|
if ((cookie & TMPFS_DIRCOOKIE_DUP) != 0) {
|
|
LIST_FOREACH(de, &node->tn_dir.tn_dupindex,
|
|
uh.td_dup.index_entries) {
|
|
MPASS(tmpfs_dirent_dup(de));
|
|
if (de->td_cookie == cookie)
|
|
goto out;
|
|
/* dupindex list is sorted. */
|
|
if (de->td_cookie < cookie) {
|
|
de = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
MPASS(de == NULL);
|
|
goto out;
|
|
}
|
|
|
|
if ((cookie & TMPFS_DIRCOOKIE_MASK) != cookie) {
|
|
de = NULL;
|
|
} else {
|
|
dekey.td_hash = cookie;
|
|
/* Recover if direntry for cookie was removed */
|
|
de = RB_NFIND(tmpfs_dir, dirhead, &dekey);
|
|
}
|
|
dc->tdc_tree = de;
|
|
dc->tdc_current = de;
|
|
if (de != NULL && tmpfs_dirent_duphead(de)) {
|
|
dc->tdc_current = LIST_FIRST(&de->ud.td_duphead);
|
|
MPASS(dc->tdc_current != NULL);
|
|
}
|
|
return (dc->tdc_current);
|
|
|
|
out:
|
|
dc->tdc_tree = de;
|
|
dc->tdc_current = de;
|
|
if (de != NULL && tmpfs_dirent_dup(de))
|
|
dc->tdc_tree = tmpfs_dir_xlookup_hash(node,
|
|
de->td_hash);
|
|
return (dc->tdc_current);
|
|
}
|
|
|
|
/*
|
|
* Looks for a directory entry in the directory represented by node.
|
|
* 'cnp' describes the name of the entry to look for. Note that the .
|
|
* and .. components are not allowed as they do not physically exist
|
|
* within directories.
|
|
*
|
|
* Returns a pointer to the entry when found, otherwise NULL.
|
|
*/
|
|
struct tmpfs_dirent *
|
|
tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f,
|
|
struct componentname *cnp)
|
|
{
|
|
struct tmpfs_dir_duphead *duphead;
|
|
struct tmpfs_dirent *de;
|
|
uint32_t hash;
|
|
|
|
MPASS(IMPLIES(cnp->cn_namelen == 1, cnp->cn_nameptr[0] != '.'));
|
|
MPASS(IMPLIES(cnp->cn_namelen == 2, !(cnp->cn_nameptr[0] == '.' &&
|
|
cnp->cn_nameptr[1] == '.')));
|
|
TMPFS_VALIDATE_DIR(node);
|
|
|
|
hash = tmpfs_dirent_hash(cnp->cn_nameptr, cnp->cn_namelen);
|
|
de = tmpfs_dir_xlookup_hash(node, hash);
|
|
if (de != NULL && tmpfs_dirent_duphead(de)) {
|
|
duphead = &de->ud.td_duphead;
|
|
LIST_FOREACH(de, duphead, uh.td_dup.entries) {
|
|
if (TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
|
|
cnp->cn_namelen))
|
|
break;
|
|
}
|
|
} else if (de != NULL) {
|
|
if (!TMPFS_DIRENT_MATCHES(de, cnp->cn_nameptr,
|
|
cnp->cn_namelen))
|
|
de = NULL;
|
|
}
|
|
if (de != NULL && f != NULL && de->td_node != f)
|
|
de = NULL;
|
|
|
|
return (de);
|
|
}
|
|
|
|
/*
|
|
* Attach duplicate-cookie directory entry nde to dnode and insert to dupindex
|
|
* list, allocate new cookie value.
|
|
*/
|
|
static void
|
|
tmpfs_dir_attach_dup(struct tmpfs_node *dnode,
|
|
struct tmpfs_dir_duphead *duphead, struct tmpfs_dirent *nde)
|
|
{
|
|
struct tmpfs_dir_duphead *dupindex;
|
|
struct tmpfs_dirent *de, *pde;
|
|
|
|
dupindex = &dnode->tn_dir.tn_dupindex;
|
|
de = LIST_FIRST(dupindex);
|
|
if (de == NULL || de->td_cookie < TMPFS_DIRCOOKIE_DUP_MAX) {
|
|
if (de == NULL)
|
|
nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
|
|
else
|
|
nde->td_cookie = de->td_cookie + 1;
|
|
MPASS(tmpfs_dirent_dup(nde));
|
|
LIST_INSERT_HEAD(dupindex, nde, uh.td_dup.index_entries);
|
|
LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Cookie numbers are near exhaustion. Scan dupindex list for unused
|
|
* numbers. dupindex list is sorted in descending order. Keep it so
|
|
* after inserting nde.
|
|
*/
|
|
while (1) {
|
|
pde = de;
|
|
de = LIST_NEXT(de, uh.td_dup.index_entries);
|
|
if (de == NULL && pde->td_cookie != TMPFS_DIRCOOKIE_DUP_MIN) {
|
|
/*
|
|
* Last element of the index doesn't have minimal cookie
|
|
* value, use it.
|
|
*/
|
|
nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MIN;
|
|
LIST_INSERT_AFTER(pde, nde, uh.td_dup.index_entries);
|
|
LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
|
|
return;
|
|
} else if (de == NULL) {
|
|
/*
|
|
* We are so lucky have 2^30 hash duplicates in single
|
|
* directory :) Return largest possible cookie value.
|
|
* It should be fine except possible issues with
|
|
* VOP_READDIR restart.
|
|
*/
|
|
nde->td_cookie = TMPFS_DIRCOOKIE_DUP_MAX;
|
|
LIST_INSERT_HEAD(dupindex, nde,
|
|
uh.td_dup.index_entries);
|
|
LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
|
|
return;
|
|
}
|
|
if (de->td_cookie + 1 == pde->td_cookie ||
|
|
de->td_cookie >= TMPFS_DIRCOOKIE_DUP_MAX)
|
|
continue; /* No hole or invalid cookie. */
|
|
nde->td_cookie = de->td_cookie + 1;
|
|
MPASS(tmpfs_dirent_dup(nde));
|
|
MPASS(pde->td_cookie > nde->td_cookie);
|
|
MPASS(nde->td_cookie > de->td_cookie);
|
|
LIST_INSERT_BEFORE(de, nde, uh.td_dup.index_entries);
|
|
LIST_INSERT_HEAD(duphead, nde, uh.td_dup.entries);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Attaches the directory entry de to the directory represented by vp.
|
|
* Note that this does not change the link count of the node pointed by
|
|
* the directory entry, as this is done by tmpfs_alloc_dirent.
|
|
*/
|
|
void
|
|
tmpfs_dir_attach(struct vnode *vp, struct tmpfs_dirent *de)
|
|
{
|
|
struct tmpfs_node *dnode;
|
|
struct tmpfs_dirent *xde, *nde;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, __func__);
|
|
MPASS(de->td_namelen > 0);
|
|
MPASS(de->td_hash >= TMPFS_DIRCOOKIE_MIN);
|
|
MPASS(de->td_cookie == de->td_hash);
|
|
|
|
dnode = VP_TO_TMPFS_DIR(vp);
|
|
dnode->tn_dir.tn_readdir_lastn = 0;
|
|
dnode->tn_dir.tn_readdir_lastp = NULL;
|
|
|
|
MPASS(!tmpfs_dirent_dup(de));
|
|
xde = RB_INSERT(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
|
|
if (xde != NULL && tmpfs_dirent_duphead(xde))
|
|
tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
|
|
else if (xde != NULL) {
|
|
/*
|
|
* Allocate new duphead. Swap xde with duphead to avoid
|
|
* adding/removing elements with the same hash.
|
|
*/
|
|
MPASS(!tmpfs_dirent_dup(xde));
|
|
tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), NULL, NULL, 0,
|
|
&nde);
|
|
/* *nde = *xde; XXX gcc 4.2.1 may generate invalid code. */
|
|
memcpy(nde, xde, sizeof(*xde));
|
|
xde->td_cookie |= TMPFS_DIRCOOKIE_DUPHEAD;
|
|
LIST_INIT(&xde->ud.td_duphead);
|
|
xde->td_namelen = 0;
|
|
xde->td_node = NULL;
|
|
tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, nde);
|
|
tmpfs_dir_attach_dup(dnode, &xde->ud.td_duphead, de);
|
|
}
|
|
dnode->tn_size += sizeof(struct tmpfs_dirent);
|
|
dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
|
|
TMPFS_NODE_MODIFIED;
|
|
tmpfs_update(vp);
|
|
}
|
|
|
|
/*
|
|
* Detaches the directory entry de from the directory represented by vp.
|
|
* Note that this does not change the link count of the node pointed by
|
|
* the directory entry, as this is done by tmpfs_free_dirent.
|
|
*/
|
|
void
|
|
tmpfs_dir_detach(struct vnode *vp, struct tmpfs_dirent *de)
|
|
{
|
|
struct tmpfs_mount *tmp;
|
|
struct tmpfs_dir *head;
|
|
struct tmpfs_node *dnode;
|
|
struct tmpfs_dirent *xde;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, __func__);
|
|
|
|
dnode = VP_TO_TMPFS_DIR(vp);
|
|
head = &dnode->tn_dir.tn_dirhead;
|
|
dnode->tn_dir.tn_readdir_lastn = 0;
|
|
dnode->tn_dir.tn_readdir_lastp = NULL;
|
|
|
|
if (tmpfs_dirent_dup(de)) {
|
|
/* Remove duphead if de was last entry. */
|
|
if (LIST_NEXT(de, uh.td_dup.entries) == NULL) {
|
|
xde = tmpfs_dir_xlookup_hash(dnode, de->td_hash);
|
|
MPASS(tmpfs_dirent_duphead(xde));
|
|
} else
|
|
xde = NULL;
|
|
LIST_REMOVE(de, uh.td_dup.entries);
|
|
LIST_REMOVE(de, uh.td_dup.index_entries);
|
|
if (xde != NULL) {
|
|
if (LIST_EMPTY(&xde->ud.td_duphead)) {
|
|
RB_REMOVE(tmpfs_dir, head, xde);
|
|
tmp = VFS_TO_TMPFS(vp->v_mount);
|
|
MPASS(xde->td_node == NULL);
|
|
tmpfs_free_dirent(tmp, xde);
|
|
}
|
|
}
|
|
de->td_cookie = de->td_hash;
|
|
} else
|
|
RB_REMOVE(tmpfs_dir, head, de);
|
|
|
|
dnode->tn_size -= sizeof(struct tmpfs_dirent);
|
|
dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
|
|
TMPFS_NODE_MODIFIED;
|
|
tmpfs_update(vp);
|
|
}
|
|
|
|
void
|
|
tmpfs_dir_destroy(struct tmpfs_mount *tmp, struct tmpfs_node *dnode)
|
|
{
|
|
struct tmpfs_dirent *de, *dde, *nde;
|
|
|
|
RB_FOREACH_SAFE(de, tmpfs_dir, &dnode->tn_dir.tn_dirhead, nde) {
|
|
RB_REMOVE(tmpfs_dir, &dnode->tn_dir.tn_dirhead, de);
|
|
/* Node may already be destroyed. */
|
|
de->td_node = NULL;
|
|
if (tmpfs_dirent_duphead(de)) {
|
|
while ((dde = LIST_FIRST(&de->ud.td_duphead)) != NULL) {
|
|
LIST_REMOVE(dde, uh.td_dup.entries);
|
|
dde->td_node = NULL;
|
|
tmpfs_free_dirent(tmp, dde);
|
|
}
|
|
}
|
|
tmpfs_free_dirent(tmp, de);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Helper function for tmpfs_readdir. Creates a '.' entry for the given
|
|
* directory and returns it in the uio space. The function returns 0
|
|
* on success, -1 if there was not enough space in the uio structure to
|
|
* hold the directory entry or an appropriate error code if another
|
|
* error happens.
|
|
*/
|
|
static int
|
|
tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio)
|
|
{
|
|
int error;
|
|
struct dirent dent;
|
|
|
|
TMPFS_VALIDATE_DIR(node);
|
|
MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOT);
|
|
|
|
dent.d_fileno = node->tn_id;
|
|
dent.d_type = DT_DIR;
|
|
dent.d_namlen = 1;
|
|
dent.d_name[0] = '.';
|
|
dent.d_name[1] = '\0';
|
|
dent.d_reclen = GENERIC_DIRSIZ(&dent);
|
|
|
|
if (dent.d_reclen > uio->uio_resid)
|
|
error = EJUSTRETURN;
|
|
else
|
|
error = uiomove(&dent, dent.d_reclen, uio);
|
|
|
|
tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Helper function for tmpfs_readdir. Creates a '..' entry for the given
|
|
* directory and returns it in the uio space. The function returns 0
|
|
* on success, -1 if there was not enough space in the uio structure to
|
|
* hold the directory entry or an appropriate error code if another
|
|
* error happens.
|
|
*/
|
|
static int
|
|
tmpfs_dir_getdotdotdent(struct tmpfs_node *node, struct uio *uio)
|
|
{
|
|
int error;
|
|
struct dirent dent;
|
|
|
|
TMPFS_VALIDATE_DIR(node);
|
|
MPASS(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT);
|
|
|
|
/*
|
|
* Return ENOENT if the current node is already removed.
|
|
*/
|
|
TMPFS_ASSERT_LOCKED(node);
|
|
if (node->tn_dir.tn_parent == NULL)
|
|
return (ENOENT);
|
|
|
|
TMPFS_NODE_LOCK(node->tn_dir.tn_parent);
|
|
dent.d_fileno = node->tn_dir.tn_parent->tn_id;
|
|
TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent);
|
|
|
|
dent.d_type = DT_DIR;
|
|
dent.d_namlen = 2;
|
|
dent.d_name[0] = '.';
|
|
dent.d_name[1] = '.';
|
|
dent.d_name[2] = '\0';
|
|
dent.d_reclen = GENERIC_DIRSIZ(&dent);
|
|
|
|
if (dent.d_reclen > uio->uio_resid)
|
|
error = EJUSTRETURN;
|
|
else
|
|
error = uiomove(&dent, dent.d_reclen, uio);
|
|
|
|
tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Helper function for tmpfs_readdir. Returns as much directory entries
|
|
* as can fit in the uio space. The read starts at uio->uio_offset.
|
|
* The function returns 0 on success, -1 if there was not enough space
|
|
* in the uio structure to hold the directory entry or an appropriate
|
|
* error code if another error happens.
|
|
*/
|
|
int
|
|
tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, int maxcookies,
|
|
u_long *cookies, int *ncookies)
|
|
{
|
|
struct tmpfs_dir_cursor dc;
|
|
struct tmpfs_dirent *de;
|
|
off_t off;
|
|
int error;
|
|
|
|
TMPFS_VALIDATE_DIR(node);
|
|
|
|
off = 0;
|
|
|
|
/*
|
|
* Lookup the node from the current offset. The starting offset of
|
|
* 0 will lookup both '.' and '..', and then the first real entry,
|
|
* or EOF if there are none. Then find all entries for the dir that
|
|
* fit into the buffer. Once no more entries are found (de == NULL),
|
|
* the offset is set to TMPFS_DIRCOOKIE_EOF, which will cause the next
|
|
* call to return 0.
|
|
*/
|
|
switch (uio->uio_offset) {
|
|
case TMPFS_DIRCOOKIE_DOT:
|
|
error = tmpfs_dir_getdotdent(node, uio);
|
|
if (error != 0)
|
|
return (error);
|
|
uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT;
|
|
if (cookies != NULL)
|
|
cookies[(*ncookies)++] = off = uio->uio_offset;
|
|
/* FALLTHROUGH */
|
|
case TMPFS_DIRCOOKIE_DOTDOT:
|
|
error = tmpfs_dir_getdotdotdent(node, uio);
|
|
if (error != 0)
|
|
return (error);
|
|
de = tmpfs_dir_first(node, &dc);
|
|
uio->uio_offset = tmpfs_dirent_cookie(de);
|
|
if (cookies != NULL)
|
|
cookies[(*ncookies)++] = off = uio->uio_offset;
|
|
/* EOF. */
|
|
if (de == NULL)
|
|
return (0);
|
|
break;
|
|
case TMPFS_DIRCOOKIE_EOF:
|
|
return (0);
|
|
default:
|
|
de = tmpfs_dir_lookup_cookie(node, uio->uio_offset, &dc);
|
|
if (de == NULL)
|
|
return (EINVAL);
|
|
if (cookies != NULL)
|
|
off = tmpfs_dirent_cookie(de);
|
|
}
|
|
|
|
/* Read as much entries as possible; i.e., until we reach the end of
|
|
* the directory or we exhaust uio space. */
|
|
do {
|
|
struct dirent d;
|
|
|
|
/* Create a dirent structure representing the current
|
|
* tmpfs_node and fill it. */
|
|
if (de->td_node == NULL) {
|
|
d.d_fileno = 1;
|
|
d.d_type = DT_WHT;
|
|
} else {
|
|
d.d_fileno = de->td_node->tn_id;
|
|
switch (de->td_node->tn_type) {
|
|
case VBLK:
|
|
d.d_type = DT_BLK;
|
|
break;
|
|
|
|
case VCHR:
|
|
d.d_type = DT_CHR;
|
|
break;
|
|
|
|
case VDIR:
|
|
d.d_type = DT_DIR;
|
|
break;
|
|
|
|
case VFIFO:
|
|
d.d_type = DT_FIFO;
|
|
break;
|
|
|
|
case VLNK:
|
|
d.d_type = DT_LNK;
|
|
break;
|
|
|
|
case VREG:
|
|
d.d_type = DT_REG;
|
|
break;
|
|
|
|
case VSOCK:
|
|
d.d_type = DT_SOCK;
|
|
break;
|
|
|
|
default:
|
|
panic("tmpfs_dir_getdents: type %p %d",
|
|
de->td_node, (int)de->td_node->tn_type);
|
|
}
|
|
}
|
|
d.d_namlen = de->td_namelen;
|
|
MPASS(de->td_namelen < sizeof(d.d_name));
|
|
(void)memcpy(d.d_name, de->ud.td_name, de->td_namelen);
|
|
d.d_name[de->td_namelen] = '\0';
|
|
d.d_reclen = GENERIC_DIRSIZ(&d);
|
|
|
|
/* Stop reading if the directory entry we are treating is
|
|
* bigger than the amount of data that can be returned. */
|
|
if (d.d_reclen > uio->uio_resid) {
|
|
error = EJUSTRETURN;
|
|
break;
|
|
}
|
|
|
|
/* Copy the new dirent structure into the output buffer and
|
|
* advance pointers. */
|
|
error = uiomove(&d, d.d_reclen, uio);
|
|
if (error == 0) {
|
|
de = tmpfs_dir_next(node, &dc);
|
|
if (cookies != NULL) {
|
|
off = tmpfs_dirent_cookie(de);
|
|
MPASS(*ncookies < maxcookies);
|
|
cookies[(*ncookies)++] = off;
|
|
}
|
|
}
|
|
} while (error == 0 && uio->uio_resid > 0 && de != NULL);
|
|
|
|
/* Skip setting off when using cookies as it is already done above. */
|
|
if (cookies == NULL)
|
|
off = tmpfs_dirent_cookie(de);
|
|
|
|
/* Update the offset and cache. */
|
|
uio->uio_offset = off;
|
|
node->tn_dir.tn_readdir_lastn = off;
|
|
node->tn_dir.tn_readdir_lastp = de;
|
|
|
|
tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
tmpfs_dir_whiteout_add(struct vnode *dvp, struct componentname *cnp)
|
|
{
|
|
struct tmpfs_dirent *de;
|
|
int error;
|
|
|
|
error = tmpfs_alloc_dirent(VFS_TO_TMPFS(dvp->v_mount), NULL,
|
|
cnp->cn_nameptr, cnp->cn_namelen, &de);
|
|
if (error != 0)
|
|
return (error);
|
|
tmpfs_dir_attach(dvp, de);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
tmpfs_dir_whiteout_remove(struct vnode *dvp, struct componentname *cnp)
|
|
{
|
|
struct tmpfs_dirent *de;
|
|
|
|
de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
|
|
MPASS(de != NULL && de->td_node == NULL);
|
|
tmpfs_dir_detach(dvp, de);
|
|
tmpfs_free_dirent(VFS_TO_TMPFS(dvp->v_mount), de);
|
|
}
|
|
|
|
/*
|
|
* Resizes the aobj associated with the regular file pointed to by 'vp' to the
|
|
* size 'newsize'. 'vp' must point to a vnode that represents a regular file.
|
|
* 'newsize' must be positive.
|
|
*
|
|
* Returns zero on success or an appropriate error code on failure.
|
|
*/
|
|
int
|
|
tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr)
|
|
{
|
|
struct tmpfs_mount *tmp;
|
|
struct tmpfs_node *node;
|
|
vm_object_t uobj;
|
|
vm_page_t m;
|
|
vm_pindex_t idx, newpages, oldpages;
|
|
off_t oldsize;
|
|
int base, rv;
|
|
|
|
MPASS(vp->v_type == VREG);
|
|
MPASS(newsize >= 0);
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
uobj = node->tn_reg.tn_aobj;
|
|
tmp = VFS_TO_TMPFS(vp->v_mount);
|
|
|
|
/*
|
|
* Convert the old and new sizes to the number of pages needed to
|
|
* store them. It may happen that we do not need to do anything
|
|
* because the last allocated page can accommodate the change on
|
|
* its own.
|
|
*/
|
|
oldsize = node->tn_size;
|
|
oldpages = OFF_TO_IDX(oldsize + PAGE_MASK);
|
|
MPASS(oldpages == uobj->size);
|
|
newpages = OFF_TO_IDX(newsize + PAGE_MASK);
|
|
if (newpages > oldpages &&
|
|
tmpfs_pages_check_avail(tmp, newpages - oldpages) == 0)
|
|
return (ENOSPC);
|
|
|
|
VM_OBJECT_WLOCK(uobj);
|
|
if (newsize < oldsize) {
|
|
/*
|
|
* Zero the truncated part of the last page.
|
|
*/
|
|
base = newsize & PAGE_MASK;
|
|
if (base != 0) {
|
|
idx = OFF_TO_IDX(newsize);
|
|
retry:
|
|
m = vm_page_lookup(uobj, idx);
|
|
if (m != NULL) {
|
|
if (vm_page_sleep_if_busy(m, "tmfssz"))
|
|
goto retry;
|
|
MPASS(m->valid == VM_PAGE_BITS_ALL);
|
|
} else if (vm_pager_has_page(uobj, idx, NULL, NULL)) {
|
|
m = vm_page_alloc(uobj, idx, VM_ALLOC_NORMAL);
|
|
if (m == NULL) {
|
|
VM_OBJECT_WUNLOCK(uobj);
|
|
VM_WAIT;
|
|
VM_OBJECT_WLOCK(uobj);
|
|
goto retry;
|
|
}
|
|
rv = vm_pager_get_pages(uobj, &m, 1, NULL,
|
|
NULL);
|
|
vm_page_lock(m);
|
|
if (rv == VM_PAGER_OK) {
|
|
/*
|
|
* Since the page was not resident,
|
|
* and therefore not recently
|
|
* accessed, immediately enqueue it
|
|
* for asynchronous laundering. The
|
|
* current operation is not regarded
|
|
* as an access.
|
|
*/
|
|
vm_page_launder(m);
|
|
vm_page_unlock(m);
|
|
vm_page_xunbusy(m);
|
|
} else {
|
|
vm_page_free(m);
|
|
vm_page_unlock(m);
|
|
if (ignerr)
|
|
m = NULL;
|
|
else {
|
|
VM_OBJECT_WUNLOCK(uobj);
|
|
return (EIO);
|
|
}
|
|
}
|
|
}
|
|
if (m != NULL) {
|
|
pmap_zero_page_area(m, base, PAGE_SIZE - base);
|
|
vm_page_dirty(m);
|
|
vm_pager_page_unswapped(m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Release any swap space and free any whole pages.
|
|
*/
|
|
if (newpages < oldpages) {
|
|
swap_pager_freespace(uobj, newpages, oldpages -
|
|
newpages);
|
|
vm_object_page_remove(uobj, newpages, 0, 0);
|
|
}
|
|
}
|
|
uobj->size = newpages;
|
|
VM_OBJECT_WUNLOCK(uobj);
|
|
|
|
atomic_add_long(&tmp->tm_pages_used, newpages - oldpages);
|
|
|
|
node->tn_size = newsize;
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
tmpfs_check_mtime(struct vnode *vp)
|
|
{
|
|
struct tmpfs_node *node;
|
|
struct vm_object *obj;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "check_mtime");
|
|
if (vp->v_type != VREG)
|
|
return;
|
|
obj = vp->v_object;
|
|
KASSERT((obj->flags & (OBJ_TMPFS_NODE | OBJ_TMPFS)) ==
|
|
(OBJ_TMPFS_NODE | OBJ_TMPFS), ("non-tmpfs obj"));
|
|
/* unlocked read */
|
|
if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) {
|
|
VM_OBJECT_WLOCK(obj);
|
|
if ((obj->flags & OBJ_TMPFS_DIRTY) != 0) {
|
|
obj->flags &= ~OBJ_TMPFS_DIRTY;
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
node->tn_status |= TMPFS_NODE_MODIFIED |
|
|
TMPFS_NODE_CHANGED;
|
|
}
|
|
VM_OBJECT_WUNLOCK(obj);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Change flags of the given vnode.
|
|
* Caller should execute tmpfs_update on vp after a successful execution.
|
|
* The vnode must be locked on entry and remain locked on exit.
|
|
*/
|
|
int
|
|
tmpfs_chflags(struct vnode *vp, u_long flags, struct ucred *cred,
|
|
struct thread *p)
|
|
{
|
|
int error;
|
|
struct tmpfs_node *node;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chflags");
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
if ((flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE | SF_NOUNLINK |
|
|
UF_APPEND | UF_ARCHIVE | UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP |
|
|
UF_NOUNLINK | UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
|
|
UF_SPARSE | UF_SYSTEM)) != 0)
|
|
return (EOPNOTSUPP);
|
|
|
|
/* Disallow this operation if the file system is mounted read-only. */
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return EROFS;
|
|
|
|
/*
|
|
* Callers may only modify the file flags on objects they
|
|
* have VADMIN rights for.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
|
|
return (error);
|
|
/*
|
|
* Unprivileged processes are not permitted to unset system
|
|
* flags, or modify flags if any system flags are set.
|
|
*/
|
|
if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
|
|
if (node->tn_flags &
|
|
(SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
|
|
error = securelevel_gt(cred, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
} else {
|
|
if (node->tn_flags &
|
|
(SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
|
|
((flags ^ node->tn_flags) & SF_SETTABLE))
|
|
return (EPERM);
|
|
}
|
|
node->tn_flags = flags;
|
|
node->tn_status |= TMPFS_NODE_CHANGED;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chflags2");
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Change access mode on the given vnode.
|
|
* Caller should execute tmpfs_update on vp after a successful execution.
|
|
* The vnode must be locked on entry and remain locked on exit.
|
|
*/
|
|
int
|
|
tmpfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct thread *p)
|
|
{
|
|
int error;
|
|
struct tmpfs_node *node;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chmod");
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
/* Disallow this operation if the file system is mounted read-only. */
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return EROFS;
|
|
|
|
/* Immutable or append-only files cannot be modified, either. */
|
|
if (node->tn_flags & (IMMUTABLE | APPEND))
|
|
return EPERM;
|
|
|
|
/*
|
|
* To modify the permissions on a file, must possess VADMIN
|
|
* for that file.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
|
|
return (error);
|
|
|
|
/*
|
|
* Privileged processes may set the sticky bit on non-directories,
|
|
* as well as set the setgid bit on a file with a group that the
|
|
* process is not a member of.
|
|
*/
|
|
if (vp->v_type != VDIR && (mode & S_ISTXT)) {
|
|
if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
|
|
return (EFTYPE);
|
|
}
|
|
if (!groupmember(node->tn_gid, cred) && (mode & S_ISGID)) {
|
|
error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
|
|
node->tn_mode &= ~ALLPERMS;
|
|
node->tn_mode |= mode & ALLPERMS;
|
|
|
|
node->tn_status |= TMPFS_NODE_CHANGED;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chmod2");
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Change ownership of the given vnode. At least one of uid or gid must
|
|
* be different than VNOVAL. If one is set to that value, the attribute
|
|
* is unchanged.
|
|
* Caller should execute tmpfs_update on vp after a successful execution.
|
|
* The vnode must be locked on entry and remain locked on exit.
|
|
*/
|
|
int
|
|
tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
|
|
struct thread *p)
|
|
{
|
|
int error;
|
|
struct tmpfs_node *node;
|
|
uid_t ouid;
|
|
gid_t ogid;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chown");
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
/* Assign default values if they are unknown. */
|
|
MPASS(uid != VNOVAL || gid != VNOVAL);
|
|
if (uid == VNOVAL)
|
|
uid = node->tn_uid;
|
|
if (gid == VNOVAL)
|
|
gid = node->tn_gid;
|
|
MPASS(uid != VNOVAL && gid != VNOVAL);
|
|
|
|
/* Disallow this operation if the file system is mounted read-only. */
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return EROFS;
|
|
|
|
/* Immutable or append-only files cannot be modified, either. */
|
|
if (node->tn_flags & (IMMUTABLE | APPEND))
|
|
return EPERM;
|
|
|
|
/*
|
|
* To modify the ownership of a file, must possess VADMIN for that
|
|
* file.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, cred, p)))
|
|
return (error);
|
|
|
|
/*
|
|
* To change the owner of a file, or change the group of a file to a
|
|
* group of which we are not a member, the caller must have
|
|
* privilege.
|
|
*/
|
|
if ((uid != node->tn_uid ||
|
|
(gid != node->tn_gid && !groupmember(gid, cred))) &&
|
|
(error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
|
|
return (error);
|
|
|
|
ogid = node->tn_gid;
|
|
ouid = node->tn_uid;
|
|
|
|
node->tn_uid = uid;
|
|
node->tn_gid = gid;
|
|
|
|
node->tn_status |= TMPFS_NODE_CHANGED;
|
|
|
|
if ((node->tn_mode & (S_ISUID | S_ISGID)) && (ouid != uid || ogid != gid)) {
|
|
if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0))
|
|
node->tn_mode &= ~(S_ISUID | S_ISGID);
|
|
}
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chown2");
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Change size of the given vnode.
|
|
* Caller should execute tmpfs_update on vp after a successful execution.
|
|
* The vnode must be locked on entry and remain locked on exit.
|
|
*/
|
|
int
|
|
tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred,
|
|
struct thread *p)
|
|
{
|
|
int error;
|
|
struct tmpfs_node *node;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chsize");
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
/* Decide whether this is a valid operation based on the file type. */
|
|
error = 0;
|
|
switch (vp->v_type) {
|
|
case VDIR:
|
|
return EISDIR;
|
|
|
|
case VREG:
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return EROFS;
|
|
break;
|
|
|
|
case VBLK:
|
|
/* FALLTHROUGH */
|
|
case VCHR:
|
|
/* FALLTHROUGH */
|
|
case VFIFO:
|
|
/* Allow modifications of special files even if in the file
|
|
* system is mounted read-only (we are not modifying the
|
|
* files themselves, but the objects they represent). */
|
|
return 0;
|
|
|
|
default:
|
|
/* Anything else is unsupported. */
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
/* Immutable or append-only files cannot be modified, either. */
|
|
if (node->tn_flags & (IMMUTABLE | APPEND))
|
|
return EPERM;
|
|
|
|
error = tmpfs_truncate(vp, size);
|
|
/* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents
|
|
* for us, as will update tn_status; no need to do that here. */
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chsize2");
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Change access and modification times of the given vnode.
|
|
* Caller should execute tmpfs_update on vp after a successful execution.
|
|
* The vnode must be locked on entry and remain locked on exit.
|
|
*/
|
|
int
|
|
tmpfs_chtimes(struct vnode *vp, struct vattr *vap,
|
|
struct ucred *cred, struct thread *l)
|
|
{
|
|
int error;
|
|
struct tmpfs_node *node;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "chtimes");
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
/* Disallow this operation if the file system is mounted read-only. */
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return EROFS;
|
|
|
|
/* Immutable or append-only files cannot be modified, either. */
|
|
if (node->tn_flags & (IMMUTABLE | APPEND))
|
|
return EPERM;
|
|
|
|
error = vn_utimes_perm(vp, vap, cred, l);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (vap->va_atime.tv_sec != VNOVAL)
|
|
node->tn_status |= TMPFS_NODE_ACCESSED;
|
|
|
|
if (vap->va_mtime.tv_sec != VNOVAL)
|
|
node->tn_status |= TMPFS_NODE_MODIFIED;
|
|
|
|
if (vap->va_birthtime.tv_sec != VNOVAL)
|
|
node->tn_status |= TMPFS_NODE_MODIFIED;
|
|
|
|
tmpfs_itimes(vp, &vap->va_atime, &vap->va_mtime);
|
|
|
|
if (vap->va_birthtime.tv_sec != VNOVAL)
|
|
node->tn_birthtime = vap->va_birthtime;
|
|
ASSERT_VOP_ELOCKED(vp, "chtimes2");
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
tmpfs_set_status(struct tmpfs_node *node, int status)
|
|
{
|
|
|
|
if ((node->tn_status & status) == status)
|
|
return;
|
|
TMPFS_NODE_LOCK(node);
|
|
node->tn_status |= status;
|
|
TMPFS_NODE_UNLOCK(node);
|
|
}
|
|
|
|
/* Sync timestamps */
|
|
void
|
|
tmpfs_itimes(struct vnode *vp, const struct timespec *acc,
|
|
const struct timespec *mod)
|
|
{
|
|
struct tmpfs_node *node;
|
|
struct timespec now;
|
|
|
|
ASSERT_VOP_LOCKED(vp, "tmpfs_itimes");
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
|
|
TMPFS_NODE_CHANGED)) == 0)
|
|
return;
|
|
|
|
vfs_timestamp(&now);
|
|
TMPFS_NODE_LOCK(node);
|
|
if (node->tn_status & TMPFS_NODE_ACCESSED) {
|
|
if (acc == NULL)
|
|
acc = &now;
|
|
node->tn_atime = *acc;
|
|
}
|
|
if (node->tn_status & TMPFS_NODE_MODIFIED) {
|
|
if (mod == NULL)
|
|
mod = &now;
|
|
node->tn_mtime = *mod;
|
|
}
|
|
if (node->tn_status & TMPFS_NODE_CHANGED)
|
|
node->tn_ctime = now;
|
|
node->tn_status &= ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
|
|
TMPFS_NODE_CHANGED);
|
|
TMPFS_NODE_UNLOCK(node);
|
|
|
|
/* XXX: FIX? The entropy here is desirable, but the harvesting may be expensive */
|
|
random_harvest_queue(node, sizeof(*node), 1, RANDOM_FS_ATIME);
|
|
}
|
|
|
|
void
|
|
tmpfs_update(struct vnode *vp)
|
|
{
|
|
|
|
tmpfs_itimes(vp, NULL, NULL);
|
|
}
|
|
|
|
int
|
|
tmpfs_truncate(struct vnode *vp, off_t length)
|
|
{
|
|
int error;
|
|
struct tmpfs_node *node;
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
if (length < 0) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (node->tn_size == length) {
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
|
|
return (EFBIG);
|
|
|
|
error = tmpfs_reg_resize(vp, length, FALSE);
|
|
if (error == 0)
|
|
node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
|
|
|
|
out:
|
|
tmpfs_update(vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static __inline int
|
|
tmpfs_dirtree_cmp(struct tmpfs_dirent *a, struct tmpfs_dirent *b)
|
|
{
|
|
if (a->td_hash > b->td_hash)
|
|
return (1);
|
|
else if (a->td_hash < b->td_hash)
|
|
return (-1);
|
|
return (0);
|
|
}
|
|
|
|
RB_GENERATE_STATIC(tmpfs_dir, tmpfs_dirent, uh.td_entries, tmpfs_dirtree_cmp);
|