diff options
Diffstat (limited to 'sys/fs/pseudofs/pseudofs_fileno.c')
| -rw-r--r-- | sys/fs/pseudofs/pseudofs_fileno.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/sys/fs/pseudofs/pseudofs_fileno.c b/sys/fs/pseudofs/pseudofs_fileno.c new file mode 100644 index 000000000000..2c6b2d1fdb4a --- /dev/null +++ b/sys/fs/pseudofs/pseudofs_fileno.c @@ -0,0 +1,159 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2001 Dag-Erling Coïdan Smørgrav + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer + * in this position and unchanged. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_pseudofs.h" + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/limits.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mutex.h> +#include <sys/proc.h> +#include <sys/sysctl.h> +#include <sys/systm.h> + +#include <fs/pseudofs/pseudofs.h> +#include <fs/pseudofs/pseudofs_internal.h> + +/* + * Initialize fileno bitmap + */ +void +pfs_fileno_init(struct pfs_info *pi) +{ + + mtx_init(&pi->pi_mutex, "pfs_fileno", NULL, MTX_DEF); + pi->pi_unrhdr = new_unrhdr(3, INT_MAX / NO_PID, &pi->pi_mutex); +} + +/* + * Tear down fileno bitmap + */ +void +pfs_fileno_uninit(struct pfs_info *pi) +{ + + delete_unrhdr(pi->pi_unrhdr); + pi->pi_unrhdr = NULL; + mtx_destroy(&pi->pi_mutex); +} + +/* + * Allocate a file number + */ +void +pfs_fileno_alloc(struct pfs_node *pn) +{ + + if (pn->pn_parent) + PFS_TRACE(("%s/%s", pn->pn_parent->pn_name, pn->pn_name)); + else + PFS_TRACE(("%s", pn->pn_name)); + pfs_assert_not_owned(pn); + + switch (pn->pn_type) { + case pfstype_root: + /* root must always be 2 */ + pn->pn_fileno = 2; + break; + case pfstype_dir: + case pfstype_file: + case pfstype_symlink: + case pfstype_procdir: + pn->pn_fileno = alloc_unr(pn->pn_info->pi_unrhdr); + break; + case pfstype_this: + KASSERT(pn->pn_parent != NULL, + ("%s(): pfstype_this node has no parent", __func__)); + pn->pn_fileno = pn->pn_parent->pn_fileno; + break; + case pfstype_parent: + KASSERT(pn->pn_parent != NULL, + ("%s(): pfstype_parent node has no parent", __func__)); + if (pn->pn_parent->pn_type == pfstype_root) { + pn->pn_fileno = pn->pn_parent->pn_fileno; + break; + } + KASSERT(pn->pn_parent->pn_parent != NULL, + ("%s(): pfstype_parent node has no grandparent", __func__)); + pn->pn_fileno = pn->pn_parent->pn_parent->pn_fileno; + break; + case pfstype_none: + KASSERT(0, + ("%s(): pfstype_none node", __func__)); + break; + } + +#if 0 + printf("%s(): %s: ", __func__, pn->pn_info->pi_name); + if (pn->pn_parent) { + if (pn->pn_parent->pn_parent) { + printf("%s/", pn->pn_parent->pn_parent->pn_name); + } + printf("%s/", pn->pn_parent->pn_name); + } + printf("%s -> %d\n", pn->pn_name, pn->pn_fileno); +#endif +} + +/* + * Release a file number + */ +void +pfs_fileno_free(struct pfs_node *pn) +{ + + pfs_assert_not_owned(pn); + + switch (pn->pn_type) { + case pfstype_root: + /* not allocated from unrhdr */ + return; + case pfstype_dir: + case pfstype_file: + case pfstype_symlink: + case pfstype_procdir: + free_unr(pn->pn_info->pi_unrhdr, pn->pn_fileno); + break; + case pfstype_this: + case pfstype_parent: + /* ignore these, as they don't "own" their file number */ + break; + case pfstype_none: + KASSERT(0, + ("pfs_fileno_free() called for pfstype_none node")); + break; + } +} |