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mkswap: do not do extra seek

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mount: add another mount helper call method
This commit is contained in:
Denis Vlasenko 2008-02-03 23:52:41 +00:00
parent c85bfcad52
commit 32d49bc70f
3 changed files with 28 additions and 3 deletions
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8
util-linux/Config.in
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@ -392,9 +392,11 @@ config FEATURE_MOUNT_HELPERS
depends on MOUNT
help
Enable mounting of virtual file systems via external helpers.
E.g. mount obexfs#-b00.11.22.33.44.55 /mnt will in effect call
obexfs -b00.11.22.33.44.55 /mnt
The idea is to use such virtual filesystems in /etc/fstab
E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
"obexfs -b00.11.22.33.44.55 /mnt"
Also "mount -t sometype [-o opts] fs /mnt" will try
"sometype [-o opts] fs /mnt" if simple mount syscall fails.
The idea is to use such virtual filesystems in /etc/fstab.
config FEATURE_MOUNT_NFS
bool "Support mounting NFS file systems"

2
util-linux/mkswap.c
View File

@ -66,7 +66,9 @@ int mkswap_main(int argc, char **argv)
fd = xopen(argv[1], O_RDWR);
/* fdlength was reported to be unreliable - use seek */
len = xlseek(fd, 0, SEEK_END);
#if ENABLE_SELINUX
xlseek(fd, 0, SEEK_SET);
#endif
pagesize = getpagesize();
printf("Setting up swapspace version 1, size = %"OFF_FMT"u bytes\n",
len - pagesize);

21
util-linux/mount.c
View File

@ -309,6 +309,27 @@ static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
for (;;) {
rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
vfsflags, filteropts);
// If mount failed, try
// helper program <mnt_type>
if (ENABLE_FEATURE_MOUNT_HELPERS && rc) {
char *args[6];
int errno_save = errno;
args[0] = mp->mnt_type;
rc = 1;
if (filteropts) {
args[rc++] = (char *)"-o";
args[rc++] = filteropts;
}
args[rc++] = mp->mnt_fsname;
args[rc++] = mp->mnt_dir;
args[rc] = NULL;
rc = wait4pid(spawn(args));
if (!rc)
break;
errno = errno_save;
}
if (!rc || (vfsflags & MS_RDONLY) || (errno != EACCES && errno != EROFS))
break;
if (!(vfsflags & MS_SILENT))