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umount: make -d always active, add -D to suppress it

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2012-04-17 13:07:28 +02:00
parent ee0d4cd8cb
commit 86a03bee1d
1 changed files with 16 additions and 8 deletions
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24
util-linux/umount.c
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@ -22,7 +22,7 @@
//usage: "\n -l Lazy umount (detach filesystem)"
//usage: "\n -f Force umount (i.e., unreachable NFS server)"
//usage: IF_FEATURE_MOUNT_LOOP(
//usage: "\n -d Free loop device if it has been used"
//usage: "\n -D Don't free loop device even if it has been used"
//usage: )
//usage:
//usage:#define umount_example_usage
@ -44,14 +44,22 @@ static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
}
#endif
/* ignored: -v -d -t -i */
#define OPTION_STRING "fldnra" "vdt:i"
/* Ignored: -v -t -i
* bbox always acts as if -d is present.
* -D can be used to suppress it (bbox extension).
* Rationale:
* (1) util-linux's umount does it if "loop=..." is seen in /etc/mtab:
* thus, on many systems, bare umount _does_ drop loop devices.
* (2) many users request this feature.
*/
#define OPTION_STRING "fldDnra" "vt:i"
#define OPT_FORCE (1 << 0) // Same as MNT_FORCE
#define OPT_LAZY (1 << 1) // Same as MNT_DETACH
#define OPT_FREELOOP (1 << 2)
#define OPT_NO_MTAB (1 << 3)
#define OPT_REMOUNT (1 << 4)
#define OPT_ALL (ENABLE_FEATURE_UMOUNT_ALL ? (1 << 5) : 0)
//#define OPT_FREE_LOOP (1 << 2) // -d is assumed always present
#define OPT_DONT_FREE_LOOP (1 << 3)
#define OPT_NO_MTAB (1 << 4)
#define OPT_REMOUNT (1 << 5)
#define OPT_ALL (ENABLE_FEATURE_UMOUNT_ALL ? (1 << 6) : 0)
int umount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int umount_main(int argc UNUSED_PARAM, char **argv)
@ -165,7 +173,7 @@ int umount_main(int argc UNUSED_PARAM, char **argv)
} else {
// De-allocate the loop device. This ioctl should be ignored on
// any non-loop block devices.
if (ENABLE_FEATURE_MOUNT_LOOP && (opt & OPT_FREELOOP) && m)
if (ENABLE_FEATURE_MOUNT_LOOP && !(opt & OPT_DONT_FREE_LOOP) && m)
del_loop(m->device);
if (ENABLE_FEATURE_MTAB_SUPPORT && !(opt & OPT_NO_MTAB) && m)
erase_mtab(m->dir);