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mount: Add suport of empty binfmt_misc (v3)

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Binfmt is global fs. We could check for its inhabitants intersect on
source and destination, but for the 1st time it's enough just to check
this one being empty.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2012-08-09 19:47:20 +04:00 committed by Pavel Emelyanov
parent af15b75b70
commit b0d7cc9724
2 changed files with 38 additions and 2 deletions
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35
mount.c
View File

@ -179,7 +179,7 @@ static struct mount_info *mnt_build_tree(struct mount_info *list)
return tree;
}
DIR *open_mountpoint(struct mount_info *pm)
static DIR *open_mountpoint(struct mount_info *pm)
{
int fd, ret;
char path[PATH_MAX + 1];
@ -222,7 +222,7 @@ DIR *open_mountpoint(struct mount_info *pm)
return fdir;
}
int close_mountpoint(DIR *dfd)
static int close_mountpoint(DIR *dfd)
{
if (closedir(dfd)) {
pr_perror("Unable to close directory");
@ -231,11 +231,42 @@ int close_mountpoint(DIR *dfd)
return 0;
}
static int binfmt_misc_dump(struct mount_info *pm)
{
int ret = -1;
struct dirent *de;
DIR *fdir = NULL;
fdir = open_mountpoint(pm);
if (fdir == NULL)
return -1;
while ((de = readdir(fdir))) {
if (!strcmp(de->d_name, "."))
continue;
if (!strcmp(de->d_name, ".."))
continue;
if (!strcmp(de->d_name, "register"))
continue;
if (!strcmp(de->d_name, "status"))
continue;
pr_err("binfmt_misc isn't empty: %s\n", de->d_name);
goto out;
}
ret = 0;
out:
close_mountpoint(fdir);
return ret;
}
static struct fstype fstypes[] = {
{ "unsupported" },
{ "proc" },
{ "sysfs" },
{ "devtmpfs" },
{ "binfmt_misc", binfmt_misc_dump },
};
struct fstype *find_fstype_by_name(char *fst)

5
test/zdtm/live/static/mountpoints.c
View File

@ -78,6 +78,11 @@ done:
fail("Can't mount proc");
return 1;
}
if (mount("none", MPTS_ROOT"/kernel/sys/fs/binfmt_misc",
"binfmt_misc", 0, "") < 0) {
fail("Can't mount proc");
return 1;
}
fd = open(MPTS_ROOT"/kernel/meminfo", O_RDONLY);
if (fd == -1)