151 lines
2.8 KiB
C
151 lines
2.8 KiB
C
/*
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* mountopts.c --- convert between default mount options and strings
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*
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* Copyright (C) 2002 Theodore Ts'o <tytso@mit.edu>
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <ctype.h>
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#include <errno.h>
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#include "e2p.h"
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struct mntopt {
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unsigned int mask;
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const char *string;
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};
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static struct mntopt mntopt_list[] = {
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{ EXT2_DEFM_DEBUG, "debug" },
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{ EXT2_DEFM_BSDGROUPS, "bsdgroups" },
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{ EXT2_DEFM_XATTR_USER, "user_xattr" },
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{ EXT2_DEFM_ACL, "acl" },
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{ EXT2_DEFM_UID16, "uid16" },
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{ EXT3_DEFM_JMODE_DATA, "journal_data" },
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{ EXT3_DEFM_JMODE_ORDERED, "journal_data_ordered" },
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{ EXT3_DEFM_JMODE_WBACK, "journal_data_writeback" },
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{ EXT4_DEFM_NOBARRIER, "nobarrier" },
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{ EXT4_DEFM_BLOCK_VALIDITY, "block_validity" },
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{ EXT4_DEFM_DISCARD, "discard"},
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{ EXT4_DEFM_NODELALLOC, "nodelalloc"},
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{ 0, 0 },
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};
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const char *e2p_mntopt2string(unsigned int mask)
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{
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struct mntopt *f;
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static char buf[20];
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int fnum;
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for (f = mntopt_list; f->string; f++) {
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if (mask == f->mask)
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return f->string;
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}
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for (fnum = 0; mask >>= 1; fnum++);
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sprintf(buf, "MNTOPT_%d", fnum);
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return buf;
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}
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int e2p_string2mntopt(char *string, unsigned int *mask)
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{
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struct mntopt *f;
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char *eptr;
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int num;
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for (f = mntopt_list; f->string; f++) {
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if (!strcasecmp(string, f->string)) {
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*mask = f->mask;
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return 0;
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}
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}
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if (strncasecmp(string, "MNTOPT_", 7))
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return 1;
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if (string[8] == 0)
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return 1;
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num = strtol(string+8, &eptr, 10);
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if (num > 31 || num < 0)
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return 1;
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if (*eptr)
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return 1;
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*mask = 1 << num;
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return 0;
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}
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static char *skip_over_blanks(char *cp)
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{
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while (*cp && isspace(*cp))
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cp++;
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return cp;
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}
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static char *skip_over_word(char *cp)
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{
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while (*cp && !isspace(*cp) && *cp != ',')
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cp++;
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return cp;
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}
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/*
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* Edit a mntopt set array as requested by the user. The ok
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* parameter, if non-zero, allows the application to limit what
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* mntopts the user is allowed to set or clear using this function.
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*/
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int e2p_edit_mntopts(const char *str, __u32 *mntopts, __u32 ok)
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{
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char *cp, *buf, *next;
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int neg;
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unsigned int mask;
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int rc = 0;
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buf = malloc(strlen(str)+1);
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if (!buf)
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return 1;
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strcpy(buf, str);
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cp = buf;
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while (cp && *cp) {
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neg = 0;
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cp = skip_over_blanks(cp);
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next = skip_over_word(cp);
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if (*next == 0)
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next = 0;
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else
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*next = 0;
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switch (*cp) {
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case '-':
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case '^':
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neg++;
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/* fallthrough */
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case '+':
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cp++;
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break;
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}
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if (e2p_string2mntopt(cp, &mask)) {
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rc = 1;
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break;
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}
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if (ok && !(ok & mask)) {
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rc = 1;
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break;
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}
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if (mask & EXT3_DEFM_JMODE)
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*mntopts &= ~EXT3_DEFM_JMODE;
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if (neg)
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*mntopts &= ~mask;
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else
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*mntopts |= mask;
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cp = next ? next+1 : 0;
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}
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free(buf);
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return rc;
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}
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