diff options
| -rw-r--r-- | util-linux/mount.c | 138 |
1 files changed, 58 insertions, 80 deletions
diff --git a/util-linux/mount.c b/util-linux/mount.c index 313521a..175328f 100644 --- a/util-linux/mount.c +++ b/util-linux/mount.c @@ -9,14 +9,14 @@ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ -/* Design notes: There is no spec for mount. Remind me to write one. - - mount_main() calls singlemount() which calls mount_it_now(). - - mount_main() can loop through /etc/fstab for mount -a - singlemount() can loop through /etc/filesystems for fstype detection. - mount_it_now() does the actual mount. -*/ +// Design notes: There is no spec for mount. Remind me to write one. +// +// mount_main() calls singlemount() which calls mount_it_now(). +// +// mount_main() can loop through /etc/fstab for mount -a +// singlemount() can loop through /etc/filesystems for fstype detection. +// mount_it_now() does the actual mount. +// #include <mntent.h> #include <syslog.h> @@ -26,7 +26,7 @@ #include "volume_id.h" #endif -/* Needed for nfs support only */ +// Needed for nfs support only #include <sys/utsname.h> #undef TRUE #undef FALSE @@ -37,15 +37,15 @@ #ifndef MS_SILENT #define MS_SILENT (1 << 15) #endif -/* Grab more as needed from util-linux's mount/mount_constants.h */ +// Grab more as needed from util-linux's mount/mount_constants.h #ifndef MS_DIRSYNC -#define MS_DIRSYNC 128 /* Directory modifications are synchronous */ +#define MS_DIRSYNC 128 // Directory modifications are synchronous #endif #if defined(__dietlibc__) -/* 16.12.2006, Sampo Kellomaki (sampo@iki.fi) - * dietlibc-0.30 does not have implementation of getmntent_r() */ +// 16.12.2006, Sampo Kellomaki (sampo@iki.fi) +// dietlibc-0.30 does not have implementation of getmntent_r() static struct mntent *getmntent_r(FILE* stream, struct mntent* result, char* buffer UNUSED_PARAM, int bufsize UNUSED_PARAM) { @@ -99,9 +99,8 @@ enum { // This may be useful e.g. for /dev/fd if a login script makes // the console user owner of this device. -/* Standard mount options (from -o options or --options), with corresponding - * flags */ - +// Standard mount options (from -o options or --options), +// with corresponding flags static const int32_t mount_options[] = { // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. @@ -166,7 +165,7 @@ static const char mount_option_str[] = ) USE_FEATURE_MOUNT_FSTAB( "defaults" "\0" - /* "quiet" "\0" - do not filter out, vfat wants to see it */ + // "quiet" "\0" - do not filter out, vfat wants to see it "noauto" "\0" "sw" "\0" "swap" "\0" @@ -275,11 +274,11 @@ static int resolve_mount_spec(char **fsname) return 0; } -/* Append mount options to string */ +// Append mount options to string static void append_mount_options(char **oldopts, const char *newopts) { if (*oldopts && **oldopts) { - /* do not insert options which are already there */ + // Do not insert options which are already there while (newopts[0]) { char *p; int len = strlen(newopts); @@ -307,8 +306,8 @@ static void append_mount_options(char **oldopts, const char *newopts) } } -/* Use the mount_options list to parse options into flags. - * Also return list of unrecognized options if unrecognized!=NULL */ +// Use the mount_options list to parse options into flags. +// Also return list of unrecognized options if unrecognized != NULL static long parse_mount_options(char *options, char **unrecognized) { long flags = MS_SILENT; @@ -321,7 +320,7 @@ static long parse_mount_options(char *options, char **unrecognized) if (comma) *comma = '\0'; -/* FIXME: use hasmntopt() */ +// FIXME: use hasmntopt() // Find this option in mount_options for (i = 0; i < ARRAY_SIZE(mount_options); i++) { if (!strcasecmp(option_str, options)) { @@ -332,7 +331,7 @@ static long parse_mount_options(char *options, char **unrecognized) } option_str += strlen(option_str) + 1; } - // If unrecognized not NULL, append unrecognized mount options */ + // If unrecognized not NULL, append unrecognized mount options if (unrecognized && i == ARRAY_SIZE(mount_options)) { // Add it to strflags, to pass on to kernel i = *unrecognized ? strlen(*unrecognized) : 0; @@ -354,7 +353,6 @@ static long parse_mount_options(char *options, char **unrecognized) } // Return a list of all block device backed filesystems - static llist_t *get_block_backed_filesystems(void) { static const char filesystems[2][sizeof("/proc/filesystems")] = { @@ -448,8 +446,8 @@ static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts) if (rc && errno == EPERM) bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); - /* If the mount was successful, and we're maintaining an old-style - * mtab file by hand, add the new entry to it now. */ + // If the mount was successful, and we're maintaining an old-style + // mtab file by hand, add the new entry to it now. mtab: if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) { char *fsname; @@ -479,7 +477,7 @@ static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts) mp->mnt_dir = bb_simplify_path(mp->mnt_dir); fsname = 0; - if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */ + if (!mp->mnt_type || !*mp->mnt_type) { // bind mount mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); mp->mnt_type = (char*)"bind"; } @@ -723,8 +721,7 @@ enum { #define EDQUOT ENOSPC #endif -// Convert each NFSERR_BLAH into EBLAH - +/* Convert each NFSERR_BLAH into EBLAH */ static const struct { short stat; short errnum; @@ -734,7 +731,6 @@ static const struct { {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT}, {70,ESTALE}, {71,EREMOTE}, {-1,EIO} }; - static char *nfs_strerror(int status) { int i; @@ -920,7 +916,7 @@ static int daemonize(void) static inline int daemonize(void) { return -ENOSYS; } #endif -// TODO +/* TODO */ static inline int we_saw_this_host_before(const char *hostname UNUSED_PARAM) { return 0; @@ -939,7 +935,7 @@ static void error_msg_rpc(const char *msg) bb_error_msg("%.*s", len, msg); } -// NB: mp->xxx fields may be trashed on exit +/* NB: mp->xxx fields may be trashed on exit */ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) { CLIENT *mclient; @@ -1290,7 +1286,7 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) } } - /* create mount daemon client */ + /* Create mount daemon client */ /* See if the nfs host = mount host. */ if (mounthost) { if (mounthost[0] >= '0' && mounthost[0] <= '9') { @@ -1336,12 +1332,12 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) retry_timeout.tv_usec = 0; total_timeout.tv_sec = 20; total_timeout.tv_usec = 0; -//FIXME: use monotonic()? +/* FIXME: use monotonic()? */ timeout = time(NULL) + 60 * retry; prevt = 0; t = 30; retry: - /* be careful not to use too many CPU cycles */ + /* Be careful not to use too many CPU cycles */ if (t - prevt < 30) sleep(30); @@ -1381,10 +1377,11 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) error_msg_rpc(clnt_spcreateerror(" ")); } else { enum clnt_stat clnt_stat; - /* try to mount hostname:pathname */ + + /* Try to mount hostname:pathname */ mclient->cl_auth = authunix_create_default(); - /* make pointers in xdr_mountres3 NULL so + /* Make pointers in xdr_mountres3 NULL so * that xdr_array allocates memory for us */ memset(&status, 0, sizeof(status)); @@ -1421,7 +1418,6 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) } /* Timeout. We are going to retry... maybe */ - if (!bg) goto fail; if (!daemonized) { @@ -1475,8 +1471,7 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) data.flags |= NFS_MOUNT_VER3; } - /* create nfs socket for kernel */ - + /* Create nfs socket for kernel */ if (tcp) { if (nfs_mount_version < 3) { bb_error_msg("NFS over TCP is not supported"); @@ -1502,14 +1497,12 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) } server_addr.sin_port = htons(port); - /* prepare data structure for kernel */ - + /* Prepare data structure for kernel */ data.fd = fsock; memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); strncpy(data.hostname, hostname, sizeof(data.hostname)); - /* clean up */ - + /* Clean up */ auth_destroy(mclient->cl_auth); clnt_destroy(mclient); close(msock); @@ -1523,7 +1516,7 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) if (!daemonized) { daemonized = daemonize(); if (daemonized <= 0) { /* parent or error */ -// FIXME: parent doesn't close fsock - ??! +/* FIXME: parent doesn't close fsock - ??! */ retval = -daemonized; goto ret; } @@ -1535,14 +1528,14 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) } } - do_mount: /* perform actual mount */ - + /* Perform actual mount */ + do_mount: mp->mnt_type = (char*)"nfs"; retval = mount_it_now(mp, vfsflags, (char*)&data); goto ret; - fail: /* abort */ - + /* Abort */ + fail: if (msock >= 0) { if (mclient) { auth_destroy(mclient->cl_auth); @@ -1560,12 +1553,12 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts) return retval; } -#else /* !ENABLE_FEATURE_MOUNT_NFS */ +#else // !ENABLE_FEATURE_MOUNT_NFS -/* Never called. Call should be optimized out. */ +// Never called. Call should be optimized out. int nfsmount(struct mntent *mp, long vfsflags, char *filteropts); -#endif /* !ENABLE_FEATURE_MOUNT_NFS */ +#endif // !ENABLE_FEATURE_MOUNT_NFS // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem // type detection. Returns 0 for success, nonzero for failure. @@ -1580,13 +1573,11 @@ static int singlemount(struct mntent *mp, int ignore_busy) vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); - // Treat fstype "auto" as unspecified. - + // Treat fstype "auto" as unspecified if (mp->mnt_type && strcmp(mp->mnt_type, "auto") == 0) mp->mnt_type = NULL; // Might this be a virtual filesystem? - if (ENABLE_FEATURE_MOUNT_HELPERS && (strchr(mp->mnt_fsname, '#')) ) { @@ -1609,7 +1600,6 @@ static int singlemount(struct mntent *mp, int ignore_busy) } // Might this be an CIFS filesystem? - if (ENABLE_FEATURE_MOUNT_CIFS && (!mp->mnt_type || strcmp(mp->mnt_type, "cifs") == 0) && (mp->mnt_fsname[0] == '/' || mp->mnt_fsname[0] == '\\') @@ -1621,12 +1611,10 @@ static int singlemount(struct mntent *mp, int ignore_busy) rc = 1; // Replace '/' with '\' and verify that unc points to "//server/share". - for (s = mp->mnt_fsname; *s; ++s) if (*s == '/') *s = '\\'; - // get server IP - + // Get server IP s = strrchr(mp->mnt_fsname, '\\'); if (s <= mp->mnt_fsname+1) goto report_error; *s = '\0'; @@ -1634,18 +1622,16 @@ static int singlemount(struct mntent *mp, int ignore_busy) *s = '\\'; if (!lsa) goto report_error; - // insert ip=... option into string flags. - + // Insert ip=... option into string flags. dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa); ip = xasprintf("ip=%s", dotted); parse_mount_options(ip, &filteropts); - // compose new unc '\\server-ip\share' + // Compose new unc '\\server-ip\share' // (s => slash after hostname) - mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s); - // lock is required + // Lock is required vfsflags |= MS_MANDLOCK; mp->mnt_type = (char*)"cifs"; @@ -1660,7 +1646,6 @@ static int singlemount(struct mntent *mp, int ignore_busy) } // Might this be an NFS filesystem? - if (ENABLE_FEATURE_MOUNT_NFS && (!mp->mnt_type || !strcmp(mp->mnt_type, "nfs")) && strchr(mp->mnt_fsname, ':') != NULL @@ -1673,15 +1658,13 @@ static int singlemount(struct mntent *mp, int ignore_busy) // a synthetic filesystem like proc or sysfs.) // (We use stat, not lstat, in order to allow // mount symlink_to_file_or_blkdev dir) - if (!stat(mp->mnt_fsname, &st) && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)) ) { // Do we need to allocate a loopback device for it? - if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { loopFile = bb_simplify_path(mp->mnt_fsname); - mp->mnt_fsname = NULL; /* will receive malloced loop dev name */ + mp->mnt_fsname = NULL; // will receive malloced loop dev name if (set_loop(&(mp->mnt_fsname), loopFile, 0) < 0) { if (errno == EPERM || errno == EACCES) bb_error_msg(bb_msg_perm_denied_are_you_root); @@ -1691,24 +1674,21 @@ static int singlemount(struct mntent *mp, int ignore_busy) } // Autodetect bind mounts - } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) vfsflags |= MS_BIND; } - /* If we know the fstype (or don't need to), jump straight - * to the actual mount. */ - + // If we know the fstype (or don't need to), jump straight + // to the actual mount. if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) rc = mount_it_now(mp, vfsflags, filteropts); else { // Loop through filesystem types until mount succeeds // or we run out - /* Initialize list of block backed filesystems. This has to be - * done here so that during "mount -a", mounts after /proc shows up - * can autodetect. */ - + // Initialize list of block backed filesystems. This has to be + // done here so that during "mount -a", mounts after /proc shows up + // can autodetect. if (!fslist) { fslist = get_block_backed_filesystems(); if (ENABLE_FEATURE_CLEAN_UP && fslist) @@ -1723,7 +1703,6 @@ static int singlemount(struct mntent *mp, int ignore_busy) } // If mount failed, clean up loop file (if any). - if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { del_loop(mp->mnt_fsname); if (ENABLE_FEATURE_CLEAN_UP) { @@ -1745,7 +1724,6 @@ static int singlemount(struct mntent *mp, int ignore_busy) // Parse options, if necessary parse fstab/mtab, and call singlemount for // each directory to be mounted. - static const char must_be_root[] ALIGN1 = "you must be root"; int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; @@ -1840,8 +1818,8 @@ int mount_main(int argc UNUSED_PARAM, char **argv) if (ENABLE_FEATURE_MOUNT_FLAGS && (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)) ) { - rc = verbose_mount(/*source:*/ "", /*target:*/ argv[0], - /*type:*/ "", /*flags:*/ i, /*data:*/ ""); + // verbose_mount(source, target, type, flags, data) + rc = verbose_mount("", argv[0], "", i, ""); if (rc) bb_simple_perror_msg_and_die(argv[0]); return rc; |