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um: hostfs: define our own API boundary

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Instead of exporting the set of functions provided by
glibc that are needed for hostfs_user.c, just build that
into the kernel image whenever hostfs is built, and then
export _those_ functions cleanly, to be independent of
the libc implementation.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Johannes Berg 2023-02-10 22:05:08 +01:00 committed by Richard Weinberger
parent ce1831fe2f
commit 8c6174503c
4 changed files with 33 additions and 73 deletions
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70
arch/um/os-Linux/user_syms.c
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@ -34,81 +34,11 @@ EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(printf);
/* Here, instead, I can provide a fake prototype. Yes, someone cares: genksyms.
* However, the modules will use the CRC defined *here*, no matter if it is
* good; so the versions of these symbols will always match
*/
#define EXPORT_SYMBOL_PROTO(sym) \
int sym(void) __weak; \
EXPORT_SYMBOL(sym);
extern void readdir64(void) __attribute__((weak));
EXPORT_SYMBOL(readdir64);
extern void truncate64(void) __attribute__((weak));
EXPORT_SYMBOL(truncate64);
#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
EXPORT_SYMBOL(vsyscall_ehdr);
EXPORT_SYMBOL(vsyscall_end);
#endif
EXPORT_SYMBOL_PROTO(__errno_location);
EXPORT_SYMBOL_PROTO(access);
EXPORT_SYMBOL_PROTO(open);
EXPORT_SYMBOL_PROTO(open64);
EXPORT_SYMBOL_PROTO(close);
EXPORT_SYMBOL_PROTO(read);
EXPORT_SYMBOL_PROTO(write);
EXPORT_SYMBOL_PROTO(dup2);
EXPORT_SYMBOL_PROTO(__xstat);
EXPORT_SYMBOL_PROTO(__lxstat);
EXPORT_SYMBOL_PROTO(__lxstat64);
EXPORT_SYMBOL_PROTO(__fxstat64);
EXPORT_SYMBOL_PROTO(lseek);
EXPORT_SYMBOL_PROTO(lseek64);
EXPORT_SYMBOL_PROTO(chown);
EXPORT_SYMBOL_PROTO(fchown);
EXPORT_SYMBOL_PROTO(truncate);
EXPORT_SYMBOL_PROTO(ftruncate64);
EXPORT_SYMBOL_PROTO(utime);
EXPORT_SYMBOL_PROTO(utimes);
EXPORT_SYMBOL_PROTO(futimes);
EXPORT_SYMBOL_PROTO(chmod);
EXPORT_SYMBOL_PROTO(fchmod);
EXPORT_SYMBOL_PROTO(rename);
EXPORT_SYMBOL_PROTO(__xmknod);
EXPORT_SYMBOL_PROTO(symlink);
EXPORT_SYMBOL_PROTO(link);
EXPORT_SYMBOL_PROTO(unlink);
EXPORT_SYMBOL_PROTO(readlink);
EXPORT_SYMBOL_PROTO(mkdir);
EXPORT_SYMBOL_PROTO(rmdir);
EXPORT_SYMBOL_PROTO(opendir);
EXPORT_SYMBOL_PROTO(readdir);
EXPORT_SYMBOL_PROTO(closedir);
EXPORT_SYMBOL_PROTO(seekdir);
EXPORT_SYMBOL_PROTO(telldir);
EXPORT_SYMBOL_PROTO(ioctl);
EXPORT_SYMBOL_PROTO(pread64);
EXPORT_SYMBOL_PROTO(pwrite64);
EXPORT_SYMBOL_PROTO(statfs);
EXPORT_SYMBOL_PROTO(statfs64);
EXPORT_SYMBOL_PROTO(getuid);
EXPORT_SYMBOL_PROTO(fsync);
EXPORT_SYMBOL_PROTO(fdatasync);
EXPORT_SYMBOL_PROTO(lstat64);
EXPORT_SYMBOL_PROTO(fstat64);
EXPORT_SYMBOL_PROTO(mknod);
/* Export symbols used by GCC for the stack protector. */
extern void __stack_smash_handler(void *) __attribute__((weak));
EXPORT_SYMBOL(__stack_smash_handler);

2
fs/Makefile
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@ -124,7 +124,7 @@ obj-$(CONFIG_9P_FS) += 9p/
obj-$(CONFIG_AFS_FS) += afs/
obj-$(CONFIG_NILFS2_FS) += nilfs2/
obj-$(CONFIG_BEFS_FS) += befs/
obj-$(CONFIG_HOSTFS) += hostfs/
obj-y += hostfs/
obj-$(CONFIG_CACHEFILES) += cachefiles/
obj-$(CONFIG_DEBUG_FS) += debugfs/
obj-$(CONFIG_TRACING) += tracefs/

6
fs/hostfs/Makefile
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@ -3,9 +3,11 @@
# Licensed under the GPL
#
hostfs-objs := hostfs_kern.o hostfs_user.o
hostfs-objs := hostfs_kern.o
obj-y :=
hostfs-builtin-$(CONFIG_HOSTFS) += hostfs_user.o hostfs_user_exp.o
obj-y := $(hostfs-builtin-y) $(hostfs-builtin-m)
obj-$(CONFIG_HOSTFS) += hostfs.o
include $(srctree)/arch/um/scripts/Makefile.rules

28
fs/hostfs/hostfs_user_exp.c Normal file
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@ -0,0 +1,28 @@
#include <linux/module.h>
#include "hostfs.h"
EXPORT_SYMBOL_GPL(stat_file);
EXPORT_SYMBOL_GPL(access_file);
EXPORT_SYMBOL_GPL(open_file);
EXPORT_SYMBOL_GPL(open_dir);
EXPORT_SYMBOL_GPL(seek_dir);
EXPORT_SYMBOL_GPL(read_dir);
EXPORT_SYMBOL_GPL(read_file);
EXPORT_SYMBOL_GPL(write_file);
EXPORT_SYMBOL_GPL(lseek_file);
EXPORT_SYMBOL_GPL(fsync_file);
EXPORT_SYMBOL_GPL(replace_file);
EXPORT_SYMBOL_GPL(close_file);
EXPORT_SYMBOL_GPL(close_dir);
EXPORT_SYMBOL_GPL(file_create);
EXPORT_SYMBOL_GPL(set_attr);
EXPORT_SYMBOL_GPL(make_symlink);
EXPORT_SYMBOL_GPL(unlink_file);
EXPORT_SYMBOL_GPL(do_mkdir);
EXPORT_SYMBOL_GPL(hostfs_do_rmdir);
EXPORT_SYMBOL_GPL(do_mknod);
EXPORT_SYMBOL_GPL(link_file);
EXPORT_SYMBOL_GPL(hostfs_do_readlink);
EXPORT_SYMBOL_GPL(rename_file);
EXPORT_SYMBOL_GPL(rename2_file);
EXPORT_SYMBOL_GPL(do_statfs);