2 * Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include "opt_pseudofs.h"
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/limits.h>
39 #include <sys/malloc.h>
40 #include <sys/mutex.h>
42 #include <sys/sysctl.h>
43 #include <sys/systm.h>
45 #include <fs/pseudofs/pseudofs.h>
46 #include <fs/pseudofs/pseudofs_internal.h>
49 * Initialize fileno bitmap
52 pfs_fileno_init(struct pfs_info *pi)
55 mtx_assert(&Giant, MA_OWNED);
56 mtx_init(&pi->pi_mutex, "pfs_fileno", NULL, MTX_DEF);
57 pi->pi_unrhdr = new_unrhdr(3, INT_MAX / NO_PID, &pi->pi_mutex);
61 * Tear down fileno bitmap
64 pfs_fileno_uninit(struct pfs_info *pi)
67 mtx_assert(&Giant, MA_OWNED);
68 delete_unrhdr(pi->pi_unrhdr);
70 mtx_destroy(&pi->pi_mutex);
74 * Allocate a file number
77 pfs_fileno_alloc(struct pfs_node *pn)
81 PFS_TRACE(("%s/%s", pn->pn_parent->pn_name, pn->pn_name));
83 PFS_TRACE(("%s", pn->pn_name));
84 pfs_assert_not_owned(pn);
86 switch (pn->pn_type) {
88 /* root must always be 2 */
95 pn->pn_fileno = alloc_unr(pn->pn_info->pi_unrhdr);
98 KASSERT(pn->pn_parent != NULL,
99 ("%s(): pfstype_this node has no parent", __func__));
100 pn->pn_fileno = pn->pn_parent->pn_fileno;
103 KASSERT(pn->pn_parent != NULL,
104 ("%s(): pfstype_parent node has no parent", __func__));
105 if (pn->pn_parent->pn_type == pfstype_root) {
106 pn->pn_fileno = pn->pn_parent->pn_fileno;
109 KASSERT(pn->pn_parent->pn_parent != NULL,
110 ("%s(): pfstype_parent node has no grandparent", __func__));
111 pn->pn_fileno = pn->pn_parent->pn_parent->pn_fileno;
115 ("%s(): pfstype_none node", __func__));
120 printf("%s(): %s: ", __func__, pn->pn_info->pi_name);
122 if (pn->pn_parent->pn_parent) {
123 printf("%s/", pn->pn_parent->pn_parent->pn_name);
125 printf("%s/", pn->pn_parent->pn_name);
127 printf("%s -> %d\n", pn->pn_name, pn->pn_fileno);
132 * Release a file number
135 pfs_fileno_free(struct pfs_node *pn)
138 pfs_assert_not_owned(pn);
140 switch (pn->pn_type) {
142 /* not allocated from unrhdr */
146 case pfstype_symlink:
147 case pfstype_procdir:
148 free_unr(pn->pn_info->pi_unrhdr, pn->pn_fileno);
152 /* ignore these, as they don't "own" their file number */
156 ("pfs_fileno_free() called for pfstype_none node"));