Add support for "noatime" and "nodiratime" mount flags to mount.
Change umount "-f" to mean force, and actually use umount2. Change umount "-l" to mean "Do not free loop device". Updates docs accordingly. -Erik
This commit is contained in:
Erik Andersen
parent
9b15e50835
commit
6c5f2c6021
@ -181,6 +181,10 @@
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// Enable support for a real /etc/mtab file instead of /proc/mounts
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//#define BB_FEATURE_MOUNT_MTAB_SUPPORT
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//
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// Enable support forced filesystem unmounting
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// (i.e. in case of an unreachable NFS system).
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#define BB_FEATURE_MOUNT_FORCE
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//
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// Enable support for mounting remote NFS volumes
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//#define BB_FEATURE_NFSMOUNT
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//
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@ -1114,18 +1114,19 @@ Flags:
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-a: Mount all file systems in fstab.
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-o option: One of many filesystem options, listed below.
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-r: Mount the filesystem read-only.
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-t filesystem-type: Specify the filesystem type.
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-t fs-type: Specify the filesystem type.
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-w: Mount for reading and writing (default).
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Options for use with the "B<-o>" flag:
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Options for use with the "-o" flag:
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async / sync: Writes are asynchronous / synchronous.
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dev / nodev: Allow use of special device files / disallow them.
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exec / noexec: Allow use of executable files / disallow them.
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async/sync: Writes are asynchronous / synchronous.
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atime/noatime: Enable / disable updates to inode access times.
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dev/nodev: Allow use of special device files / disallow them.
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exec/noexec: Allow use of executable files / disallow them.
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loop: Mounts a file via loop device.
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suid / nosuid: Allow set-user-id-root programs / disallow them.
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suid/nosuid: Allow set-user-id-root programs / disallow them.
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remount: Re-mount a currently-mounted filesystem, changing its flags.
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ro / rw: Mount for read-only / read-write.
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ro/rw: Mount for read-only / read-write.
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There are EVEN MORE flags that are specific to each filesystem.
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You'll have to see the written documentation for those.
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@ -1665,7 +1666,8 @@ Flags:
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-a: Unmount all file systems
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-r: Try to remount devices as read-only if mount is busy
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-f: Do not free loop device (if a loop device has been used)
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-f: Force filesystem umount (i.e. unreachable NFS server)
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-l: Do not free loop device (if a loop device has been used)
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Example:
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@ -1876,4 +1878,4 @@ Enrique Zanardi <ezanardi@ull.es>
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=cut
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# $Id: busybox.pod,v 1.27 2000/05/02 06:40:02 erik Exp $
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# $Id: busybox.pod,v 1.28 2000/05/05 19:49:33 erik Exp $
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32
mount.c
32
mount.c
@ -66,26 +66,28 @@ extern const char mtab_file[]; /* Defined in utility.c */
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static const char mount_usage[] = "\tmount [flags]\n"
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"\tmount [flags] device directory [-o options,more-options]\n"
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"\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
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"\n" "Flags:\n"
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"\t-a:\t\tMount all file systems in fstab.\n"
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#ifdef BB_MTAB
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"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\tDon't write a mount table entry.\n"
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"\t-f:\t\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\t\tDon't write a mount table entry.\n"
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#endif
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"\t-o option:\tOne of many filesystem options, listed below.\n"
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"\t-r:\tMount the filesystem read-only.\n"
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"\t-t filesystem-type:\tSpecify the filesystem type.\n"
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"\t-w:\tMount for reading and writing (default).\n"
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"\t-r:\t\tMount the filesystem read-only.\n"
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"\t-t fs-type:\tSpecify the filesystem type.\n"
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"\t-w:\t\tMount for reading and writing (default).\n"
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"\n"
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"Options for use with the \"-o\" flag:\n"
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
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"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
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"\texec / noexec:\tAllow use of executable files / disallow them.\n"
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"\tasync/sync:\tWrites are asynchronous / synchronous.\n"
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"\tatime/noatime:\tEnable / disable updates to inode access times.\n"
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"\tdev/nodev:\tAllow use of special device files / disallow them.\n"
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"\texec/noexec:\tAllow use of executable files / disallow them.\n"
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#if defined BB_FEATURE_MOUNT_LOOP
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"\tloop: Mounts a file via loop device.\n"
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"\tloop:\t\tMounts a file via loop device.\n"
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#endif
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"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro / rw: Mount for read-only / read-write.\n"
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"\tsuid/nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount:\tRe-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro/rw:\t\tMount for read-only / read-write.\n"
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"There are EVEN MORE flags that are specific to each filesystem.\n"
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"You'll have to see the written documentation for those.\n";
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@ -98,10 +100,14 @@ struct mount_options {
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static const struct mount_options mount_options[] = {
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{"async", ~MS_SYNCHRONOUS, 0},
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{"atime", ~0, ~MS_NOATIME},
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{"defaults", ~0, 0},
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{"dev", ~MS_NODEV, 0},
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{"diratime", ~0, ~MS_NODIRATIME},
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{"exec", ~MS_NOEXEC, 0},
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{"noatime", ~0, MS_NOATIME},
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{"nodev", ~0, MS_NODEV},
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{"nodiratime", ~0, MS_NODIRATIME},
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{"noexec", ~0, MS_NOEXEC},
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{"nosuid", ~0, MS_NOSUID},
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{"remount", ~0, MS_REMOUNT},
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24
umount.c
24
umount.c
@ -38,8 +38,11 @@ static const char umount_usage[] =
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"\n"
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#endif
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"\t-r:\tTry to remount devices as read-only if mount is busy\n"
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#if defined BB_FEATURE_MOUNT_FORCE
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"\t-f:\tForce filesystem umount (i.e. unreachable NFS server)\n"
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#endif
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#if defined BB_FEATURE_MOUNT_LOOP
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"\t-f:\tDo not free loop device (if a loop device has been used)\n"
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"\t-l:\tDo not free loop device (if a loop device has been used)\n"
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#endif
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;
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@ -53,6 +56,9 @@ static struct _mtab_entry_t *mtab_cache = NULL;
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#if defined BB_FEATURE_MOUNT_FORCE
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static int doForce = FALSE;
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#endif
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#if defined BB_FEATURE_MOUNT_LOOP
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static int freeLoop = TRUE;
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#endif
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@ -175,6 +181,14 @@ static int do_umount(const char *name, int useMtab)
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if (freeLoop == TRUE && blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
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/* this was a loop device, delete it */
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del_loop(blockDevice);
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#endif
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#if defined BB_FEATURE_MOUNT_FORCE
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if (status != 0 && doForce == TRUE) {
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status = umount2(blockDevice, MNT_FORCE);
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if (status != 0) {
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fatalError("umount: forced umount of %s failed!\n", blockDevice);
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}
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}
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#endif
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if (status != 0 && doRemount == TRUE && errno == EBUSY) {
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status = mount(blockDevice, name, NULL,
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@ -182,7 +196,6 @@ static int do_umount(const char *name, int useMtab)
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if (status == 0) {
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fprintf(stderr, "umount: %s busy - remounted read-only\n",
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blockDevice);
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/* TODO: update mtab if BB_MTAB is defined */
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} else {
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fprintf(stderr, "umount: Cannot remount %s read-only\n",
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blockDevice);
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@ -240,7 +253,7 @@ extern int umount_main(int argc, char **argv)
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umountAll = TRUE;
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break;
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#if defined BB_FEATURE_MOUNT_LOOP
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case 'f':
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case 'l':
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freeLoop = FALSE;
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break;
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#endif
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@ -248,6 +261,11 @@ extern int umount_main(int argc, char **argv)
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case 'n':
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useMtab = FALSE;
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break;
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#endif
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#ifdef BB_FEATURE_MOUNT_FORCE
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case 'f':
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doForce = TRUE;
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break;
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#endif
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case 'r':
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doRemount = TRUE;
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@ -66,26 +66,28 @@ extern const char mtab_file[]; /* Defined in utility.c */
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static const char mount_usage[] = "\tmount [flags]\n"
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"\tmount [flags] device directory [-o options,more-options]\n"
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"\n" "Flags:\n" "\t-a:\tMount all file systems in fstab.\n"
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"\n" "Flags:\n"
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"\t-a:\t\tMount all file systems in fstab.\n"
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#ifdef BB_MTAB
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"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\tDon't write a mount table entry.\n"
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"\t-f:\t\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\t\tDon't write a mount table entry.\n"
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#endif
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"\t-o option:\tOne of many filesystem options, listed below.\n"
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"\t-r:\tMount the filesystem read-only.\n"
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"\t-t filesystem-type:\tSpecify the filesystem type.\n"
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"\t-w:\tMount for reading and writing (default).\n"
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"\t-r:\t\tMount the filesystem read-only.\n"
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"\t-t fs-type:\tSpecify the filesystem type.\n"
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"\t-w:\t\tMount for reading and writing (default).\n"
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"\n"
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"Options for use with the \"-o\" flag:\n"
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
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"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
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"\texec / noexec:\tAllow use of executable files / disallow them.\n"
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"\tasync/sync:\tWrites are asynchronous / synchronous.\n"
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"\tatime/noatime:\tEnable / disable updates to inode access times.\n"
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"\tdev/nodev:\tAllow use of special device files / disallow them.\n"
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"\texec/noexec:\tAllow use of executable files / disallow them.\n"
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#if defined BB_FEATURE_MOUNT_LOOP
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"\tloop: Mounts a file via loop device.\n"
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"\tloop:\t\tMounts a file via loop device.\n"
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#endif
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"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro / rw: Mount for read-only / read-write.\n"
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"\tsuid/nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount:\tRe-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro/rw:\t\tMount for read-only / read-write.\n"
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"There are EVEN MORE flags that are specific to each filesystem.\n"
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"You'll have to see the written documentation for those.\n";
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@ -98,10 +100,14 @@ struct mount_options {
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static const struct mount_options mount_options[] = {
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{"async", ~MS_SYNCHRONOUS, 0},
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{"atime", ~0, ~MS_NOATIME},
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{"defaults", ~0, 0},
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{"dev", ~MS_NODEV, 0},
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{"diratime", ~0, ~MS_NODIRATIME},
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{"exec", ~MS_NOEXEC, 0},
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{"noatime", ~0, MS_NOATIME},
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{"nodev", ~0, MS_NODEV},
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{"nodiratime", ~0, MS_NODIRATIME},
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{"noexec", ~0, MS_NOEXEC},
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{"nosuid", ~0, MS_NOSUID},
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{"remount", ~0, MS_REMOUNT},
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@ -38,8 +38,11 @@ static const char umount_usage[] =
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"\n"
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#endif
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"\t-r:\tTry to remount devices as read-only if mount is busy\n"
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#if defined BB_FEATURE_MOUNT_FORCE
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"\t-f:\tForce filesystem umount (i.e. unreachable NFS server)\n"
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#endif
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#if defined BB_FEATURE_MOUNT_LOOP
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"\t-f:\tDo not free loop device (if a loop device has been used)\n"
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"\t-l:\tDo not free loop device (if a loop device has been used)\n"
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#endif
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;
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@ -53,6 +56,9 @@ static struct _mtab_entry_t *mtab_cache = NULL;
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#if defined BB_FEATURE_MOUNT_FORCE
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static int doForce = FALSE;
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#endif
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#if defined BB_FEATURE_MOUNT_LOOP
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static int freeLoop = TRUE;
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#endif
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@ -175,6 +181,14 @@ static int do_umount(const char *name, int useMtab)
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if (freeLoop == TRUE && blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
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/* this was a loop device, delete it */
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del_loop(blockDevice);
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#endif
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#if defined BB_FEATURE_MOUNT_FORCE
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if (status != 0 && doForce == TRUE) {
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status = umount2(blockDevice, MNT_FORCE);
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if (status != 0) {
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fatalError("umount: forced umount of %s failed!\n", blockDevice);
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}
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}
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#endif
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if (status != 0 && doRemount == TRUE && errno == EBUSY) {
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status = mount(blockDevice, name, NULL,
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@ -182,7 +196,6 @@ static int do_umount(const char *name, int useMtab)
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if (status == 0) {
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fprintf(stderr, "umount: %s busy - remounted read-only\n",
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blockDevice);
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/* TODO: update mtab if BB_MTAB is defined */
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} else {
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fprintf(stderr, "umount: Cannot remount %s read-only\n",
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blockDevice);
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@ -240,7 +253,7 @@ extern int umount_main(int argc, char **argv)
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umountAll = TRUE;
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break;
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#if defined BB_FEATURE_MOUNT_LOOP
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case 'f':
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case 'l':
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freeLoop = FALSE;
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break;
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#endif
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@ -248,6 +261,11 @@ extern int umount_main(int argc, char **argv)
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case 'n':
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useMtab = FALSE;
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break;
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#endif
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#ifdef BB_FEATURE_MOUNT_FORCE
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case 'f':
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doForce = TRUE;
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break;
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#endif
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case 'r':
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doRemount = TRUE;
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