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Add splitfs vfs layer into libstand, which allows loading big kernels and
modules split across several physical medias. Following is how it works: The splitfs code, when asked to open "foo" looks for a file "foo.split" which is a text file containing a list of filenames and media names, e.g. foo.aa "Kernel floppy 1" foo.ab "Kernel floppy 2" foo.ac "Kernel and modules floppy" For each file segment, the process is: - try to open the file - prompt "Insert the disk labelled <whatever> and press any key..." - try to open the file - return error if file could not be located RE team is free to use this feature in the upcoming 5.0-DP1. Reviewed by: msmith, dcs
This commit is contained in:
Maxim Sobolev
parent
766f7d6e03
commit
fb74e5f595
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=92494
@ -153,6 +153,7 @@ SRCS+= bootp.c rarp.c bootparam.c
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SRCS+= ufs.c nfs.c cd9660.c tftp.c zipfs.c bzipfs.c
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SRCS+= netif.c nfs.c
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SRCS+= dosfs.c ext2fs.c
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SRCS+= splitfs.c
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beforeinstall:
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${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 ${.CURDIR}/stand.h \
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@ -150,7 +150,7 @@ bzf_open(const char *fname, struct open_file *f)
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/* If the name already ends in .gz or .bz2, ignore it */
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if ((cp = strrchr(fname, '.')) && (!strcmp(cp, ".gz")
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|| !strcmp(cp, ".bz2")))
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|| !strcmp(cp, ".bz2") || !strcmp(cp, ".split")))
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return(ENOENT);
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/* Construct new name */
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@ -175,7 +175,7 @@ zf_open(const char *fname, struct open_file *f)
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/* If the name already ends in .gz or .bz2, ignore it */
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if ((cp = strrchr(fname, '.')) && (!strcmp(cp, ".gz")
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|| !strcmp(cp, ".bz2")))
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|| !strcmp(cp, ".bz2") || !strcmp(cp, ".split")))
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return(ENOENT);
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/* Construct new name */
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287
lib/libstand/splitfs.c
Normal file
287
lib/libstand/splitfs.c
Normal file
@ -0,0 +1,287 @@
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/*
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* Copyright (c) 2002 Maxim Sobolev
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* All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "stand.h"
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#define NTRIES (3)
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#define CONF_BUF (512)
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#define SEEK_BUF (512)
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struct split_file
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{
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char **filesv; /* Filenames */
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char **descsv; /* Descriptions */
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int filesc; /* Number of parts */
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int curfile; /* Current file number */
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int curfd; /* Current file descriptor */
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off_t tot_pos; /* Offset from the beginning of the sequence */
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off_t file_pos; /* Offset from the beginning of the slice */
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};
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static int splitfs_open(const char *path, struct open_file *f);
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static int splitfs_close(struct open_file *f);
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static int splitfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
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static off_t splitfs_seek(struct open_file *f, off_t offset, int where);
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static int splitfs_stat(struct open_file *f, struct stat *sb);
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struct fs_ops splitfs_fsops = {
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"split",
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splitfs_open,
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splitfs_close,
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splitfs_read,
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null_write,
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splitfs_seek,
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splitfs_stat,
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null_readdir
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};
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static void
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split_file_destroy(struct split_file *sf)
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{
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int i;
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if (sf->filesc > 0) {
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for (i = 0; i < sf->filesc; i++) {
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free(sf->filesv[i]);
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free(sf->descsv[i]);
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}
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free(sf->filesv);
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free(sf->descsv);
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}
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free(sf);
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}
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static int
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splitfs_open(const char *fname, struct open_file *f)
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{
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char *buf, *confname, *cp;
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int conffd;
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struct split_file *sf;
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struct stat sb;
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printf("%s\n", fname);
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/* Have to be in "just read it" mode */
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if (f->f_flags != F_READ)
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return(EPERM);
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/* If the name already ends in `.split', ignore it */
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if ((cp = strrchr(fname, '.')) && (!strcmp(cp, ".split")))
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return(ENOENT);
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/* Construct new name */
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confname = malloc(strlen(fname) + 7);
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sprintf(confname, "%s.split", fname);
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/* Try to open the configuration file */
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conffd = open(confname, O_RDONLY);
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free(confname);
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if (conffd == -1)
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return(ENOENT);
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if (fstat(conffd, &sb) < 0) {
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printf("splitfs_open: stat failed\n");
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close(conffd);
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return(ENOENT);
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}
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if (!S_ISREG(sb.st_mode)) {
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printf("splitfs_open: not a file\n");
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close(conffd);
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return(EISDIR); /* best guess */
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}
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/* Allocate a split_file structure, populate it from the config file */
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sf = malloc(sizeof(struct split_file));
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bzero(sf, sizeof(struct split_file));
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buf = malloc(CONF_BUF);
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while (fgetstr(buf, CONF_BUF, conffd) > 0) {
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cp = buf;
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while ((*cp != '\0') && (isspace(*cp) == 0))
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cp++;
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if (*cp != '\0') {
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*cp = '\0';
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cp++;
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}
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while ((*cp != '\0') && (isspace(*cp) != 0))
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cp++;
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if (*cp == '\0')
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cp = buf;
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sf->filesc++;
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sf->filesv = realloc(sf->filesv, sizeof(*(sf->filesv)) * sf->filesc);
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sf->descsv = realloc(sf->descsv, sizeof(*(sf->descsv)) * sf->filesc);
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sf->filesv[sf->filesc - 1] = strdup(buf);
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sf->descsv[sf->filesc - 1] = strdup(cp);
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}
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free(buf);
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close(conffd);
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if ((sf->filesc == 0) || ((sf->curfd = open(sf->filesv[0], O_RDONLY)) == -1)) {
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split_file_destroy(sf);
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return(ENOENT);
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}
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/* Looks OK, we'll take it */
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f->f_fsdata = sf;
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return (0);
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}
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static int
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splitfs_close(struct open_file *f)
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{
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int fd;
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struct split_file *sf;
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sf = (struct split_file *)f->f_fsdata;
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fd = sf->curfd;
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split_file_destroy(sf);
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return(close(fd));
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}
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static int
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splitfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
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{
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int i, nread, totread;
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struct split_file *sf;
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sf = (struct split_file *)f->f_fsdata;
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totread = 0;
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do {
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nread = read(sf->curfd, buf, size - totread);
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/* Error? */
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if (nread == -1)
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return (errno);
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sf->tot_pos += nread;
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sf->file_pos += nread;
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totread += nread;
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buf += nread;
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if (totread < size) { /* EOF */
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if (sf->curfile == (sf->filesc - 1)) /* Last slice */
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break;
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/* Close previous slice */
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if (close(sf->curfd) != 0)
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return (errno);
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sf->curfile++;
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for (i = 0;; i++) {
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sf->curfd = open(sf->filesv[sf->curfile], O_RDONLY);
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if (sf->curfd >= 0)
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break;
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if ((sf->curfd == -1) && (errno != ENOENT))
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return (errno);
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if (i == NTRIES)
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return (EIO);
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printf("\nInsert disk labelled %s and press any key...", sf->descsv[sf->curfile]);
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getchar();putchar('\n');
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}
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sf->file_pos = 0;
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}
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} while (totread < size);
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if (resid != NULL)
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*resid = size - totread;
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return (0);
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}
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static off_t
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splitfs_seek(struct open_file *f, off_t offset, int where)
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{
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int nread;
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size_t resid;
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off_t new_pos, seek_by;
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struct split_file *sf;
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sf = (struct split_file *)f->f_fsdata;
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seek_by = offset;
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switch (where) {
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case SEEK_SET:
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seek_by -= sf->tot_pos;
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break;
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case SEEK_CUR:
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break;
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case SEEK_END:
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panic("splitfs_seek: SEEK_END not supported");
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break;
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}
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if (seek_by > 0) {
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/*
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* Seek forward - implemented using splitfs_read(), because otherwise we'll be
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* unable to detect that we have crossed slice boundary and hence
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* unable to do a long seek crossing that boundary.
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*/
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void *tmp;
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tmp = malloc(SEEK_BUF);
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if (tmp == NULL)
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return (-1);
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nread = 0;
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for (; seek_by > 0; seek_by -= nread) {
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resid = 0;
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errno = splitfs_read(f, tmp, min(seek_by, SEEK_BUF), &resid);
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nread = min(seek_by, SEEK_BUF) - resid;
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if ((errno != 0) || (nread == 0))
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/* Error or EOF */
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break;
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}
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free(tmp);
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if (errno != 0)
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return (-1);
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}
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if (seek_by != 0) {
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/* Seek backward or seek past the boundary of the last slice */
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if (sf->file_pos + seek_by < 0)
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panic("splitfs_seek: can't seek past the beginning of the slice");
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new_pos = lseek(sf->curfd, seek_by, SEEK_CUR);
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if (new_pos < 0)
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return (-1);
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sf->tot_pos += new_pos - sf->file_pos;
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sf->file_pos = new_pos;
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}
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return (sf->tot_pos);
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}
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static int
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splitfs_stat(struct open_file *f, struct stat *sb)
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{
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int result;
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struct split_file *sf = (struct split_file *)f->f_fsdata;
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/* stat as normal, but indicate that size is unknown */
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if ((result = fstat(sf->curfd, sb)) == 0)
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sb->st_size = -1;
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return (result);
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}
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@ -125,6 +125,7 @@ extern struct fs_ops zipfs_fsops;
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extern struct fs_ops bzipfs_fsops;
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extern struct fs_ops dosfs_fsops;
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extern struct fs_ops ext2fs_fsops;
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extern struct fs_ops splitfs_fsops;
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/* where values for lseek(2) */
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#define SEEK_SET 0 /* set file offset to offset */
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@ -175,7 +175,7 @@ zf_open(const char *fname, struct open_file *f)
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/* If the name already ends in .gz or .bz2, ignore it */
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if ((cp = strrchr(fname, '.')) && (!strcmp(cp, ".gz")
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|| !strcmp(cp, ".bz2")))
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|| !strcmp(cp, ".bz2") || !strcmp(cp, ".split")))
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return(ENOENT);
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/* Construct new name */
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@ -60,6 +60,7 @@ struct fs_ops *file_system[] = {
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&ext2fs_fsops,
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&dosfs_fsops,
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&cd9660_fsops,
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&splitfs_fsops,
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#ifdef LOADER_GZIP_SUPPORT
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&zipfs_fsops,
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#endif
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