1 /* vi: set sw=4 ts=4: */
3 * mountopts.c --- convert between default mount options and strings
5 * Copyright (C) 2002 Theodore Ts'o <tytso@mit.edu>
7 * This file can be redistributed under the terms of the GNU Library General
25 static const struct mntopt mntopt_list[] = {
26 { EXT2_DEFM_DEBUG, "debug" },
27 { EXT2_DEFM_BSDGROUPS, "bsdgroups" },
28 { EXT2_DEFM_XATTR_USER, "user_xattr" },
29 { EXT2_DEFM_ACL, "acl" },
30 { EXT2_DEFM_UID16, "uid16" },
31 { EXT3_DEFM_JMODE_DATA, "journal_data" },
32 { EXT3_DEFM_JMODE_ORDERED, "journal_data_ordered" },
33 { EXT3_DEFM_JMODE_WBACK, "journal_data_writeback" },
37 const char *e2p_mntopt2string(unsigned int mask)
39 const struct mntopt *f;
43 for (f = mntopt_list; f->string; f++) {
47 for (fnum = 0; mask >>= 1; fnum++);
48 sprintf(buf, "MNTOPT_%d", fnum);
52 int e2p_string2mntopt(char *string, unsigned int *mask)
54 const struct mntopt *f;
58 for (f = mntopt_list; f->string; f++) {
59 if (!strcasecmp(string, f->string)) {
64 if (strncasecmp(string, "MNTOPT_", 8))
69 num = strtol(string+8, &eptr, 10);
70 if (num > 32 || num < 0)
78 static char *skip_over_blanks(char *cp)
80 while (*cp && isspace(*cp))
85 static char *skip_over_word(char *cp)
87 while (*cp && !isspace(*cp) && *cp != ',')
93 * Edit a mntopt set array as requested by the user. The ok
94 * parameter, if non-zero, allows the application to limit what
95 * mntopts the user is allowed to set or clear using this function.
97 int e2p_edit_mntopts(const char *str, __u32 *mntopts, __u32 ok)
99 char *cp, *buf, *next;
107 cp = skip_over_blanks(cp);
108 next = skip_over_word(cp);
121 if (e2p_string2mntopt(cp, &mask))
123 if (ok && !(ok & mask))
125 if (mask & EXT3_DEFM_JMODE)
126 *mntopts &= ~EXT3_DEFM_JMODE;
131 cp = next ? next+1 : 0;