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[S390] Hypervisor filesystem (s390_hypfs) for z/VM

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This is an extension of the already existing hypfs for LPAR (DIAG 204).
Data returned by DIAG 2fc is exported using the s390_hypfs when Linux
is running under z/VM. Information about cpus and memory is provided.
Data is put into different virtual files which can be accessed from user
space. All values are represented as ASCII strings

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu
2007-02-05 21:18:29 +01:00
committed by Martin Schwidefsky
parent cced1dd42e
commit 31cb4bd31a
5 changed files with 262 additions and 27 deletions
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31
arch/s390/hypfs/inode.c
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@@ -19,7 +19,6 @@
#include <linux/module.h>
#include <asm/ebcdic.h>
#include "hypfs.h"
#include "hypfs_diag.h"
#define HYPFS_MAGIC 0x687970 /* ASCII 'hyp' */
#define TMP_SIZE 64 /* size of temporary buffers */
@@ -192,7 +191,10 @@ static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov,
goto out;
}
hypfs_delete_tree(sb->s_root);
rc = hypfs_diag_create_files(sb, sb->s_root);
if (MACHINE_IS_VM)
rc = hypfs_vm_create_files(sb, sb->s_root);
else
rc = hypfs_diag_create_files(sb, sb->s_root);
if (rc) {
printk(KERN_ERR "hypfs: Update failed\n");
hypfs_delete_tree(sb->s_root);
@@ -289,7 +291,10 @@ static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
rc = -ENOMEM;
goto err_alloc;
}
rc = hypfs_diag_create_files(sb, root_dentry);
if (MACHINE_IS_VM)
rc = hypfs_vm_create_files(sb, root_dentry);
else
rc = hypfs_diag_create_files(sb, root_dentry);
if (rc)
goto err_tree;
sbi->update_file = hypfs_create_update_file(sb, root_dentry);
@@ -462,11 +467,15 @@ static int __init hypfs_init(void)
{
int rc;
if (MACHINE_IS_VM)
return -ENODATA;
if (hypfs_diag_init()) {
rc = -ENODATA;
goto fail_diag;
if (MACHINE_IS_VM) {
if (hypfs_vm_init())
/* no diag 2fc, just exit */
return -ENODATA;
} else {
if (hypfs_diag_init()) {
rc = -ENODATA;
goto fail_diag;
}
}
kset_set_kset_s(&s390_subsys, hypervisor_subsys);
rc = subsystem_register(&s390_subsys);
@@ -480,7 +489,8 @@ static int __init hypfs_init(void)
fail_filesystem:
subsystem_unregister(&s390_subsys);
fail_sysfs:
hypfs_diag_exit();
if (!MACHINE_IS_VM)
hypfs_diag_exit();
fail_diag:
printk(KERN_ERR "hypfs: Initialization failed with rc = %i.\n", rc);
return rc;
@@ -488,7 +498,8 @@ fail_diag:
static void __exit hypfs_exit(void)
{
hypfs_diag_exit();
if (!MACHINE_IS_VM)
hypfs_diag_exit();
unregister_filesystem(&hypfs_type);
subsystem_unregister(&s390_subsys);
}