--- /dev/null
+/*
+ * fs/hypfs/hypfs_diag.c
+ * Hypervisor filesystem for Linux on s390. Diag 204 and 224
+ * implementation.
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+#include <asm/ebcdic.h>
+#include "hypfs.h"
+
+#define LPAR_NAME_LEN 8 /* lpar name len in diag 204 data */
+#define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */
+#define TMP_SIZE 64 /* size of temporary buffers */
+
+/* diag 204 subcodes */
+enum diag204_sc {
+ SUBC_STIB4 = 4,
+ SUBC_RSI = 5,
+ SUBC_STIB6 = 6,
+ SUBC_STIB7 = 7
+};
+
+/* The two available diag 204 data formats */
+enum diag204_format {
+ INFO_SIMPLE = 0,
+ INFO_EXT = 0x00010000
+};
+
+/* bit is set in flags, when physical cpu info is included in diag 204 data */
+#define LPAR_PHYS_FLG 0x80
+
+static char *diag224_cpu_names; /* diag 224 name table */
+static enum diag204_sc diag204_store_sc; /* used subcode for store */
+static enum diag204_format diag204_info_type; /* used diag 204 data format */
+
+static void *diag204_buf; /* 4K aligned buffer for diag204 data */
+static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */
+static int diag204_buf_pages; /* number of pages for diag204 data */
+
+/*
+ * DIAG 204 data structures and member access functions.
+ *
+ * Since we have two different diag 204 data formats for old and new s390
+ * machines, we do not access the structs directly, but use getter functions for
+ * each struct member instead. This should make the code more readable.
+ */
+
+/* Time information block */
+
+struct info_blk_hdr {
+ __u8 npar;
+ __u8 flags;
+ __u16 tslice;
+ __u16 phys_cpus;
+ __u16 this_part;
+ __u64 curtod;
+} __attribute__ ((packed));
+
+struct x_info_blk_hdr {
+ __u8 npar;
+ __u8 flags;
+ __u16 tslice;
+ __u16 phys_cpus;
+ __u16 this_part;
+ __u64 curtod1;
+ __u64 curtod2;
+ char reserved[40];
+} __attribute__ ((packed));
+
+static inline int info_blk_hdr__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct info_blk_hdr);
+ else /* INFO_EXT */
+ return sizeof(struct x_info_blk_hdr);
+}
+
+static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct info_blk_hdr *)hdr)->npar;
+ else /* INFO_EXT */
+ return ((struct x_info_blk_hdr *)hdr)->npar;
+}
+
+static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct info_blk_hdr *)hdr)->flags;
+ else /* INFO_EXT */
+ return ((struct x_info_blk_hdr *)hdr)->flags;
+}
+
+static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct info_blk_hdr *)hdr)->phys_cpus;
+ else /* INFO_EXT */
+ return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
+}
+
+/* Partition header */
+
+struct part_hdr {
+ __u8 pn;
+ __u8 cpus;
+ char reserved[6];
+ char part_name[LPAR_NAME_LEN];
+} __attribute__ ((packed));
+
+struct x_part_hdr {
+ __u8 pn;
+ __u8 cpus;
+ __u8 rcpus;
+ __u8 pflag;
+ __u32 mlu;
+ char part_name[LPAR_NAME_LEN];
+ char lpc_name[8];
+ char os_name[8];
+ __u64 online_cs;
+ __u64 online_es;
+ __u8 upid;
+ char reserved1[3];
+ __u32 group_mlu;
+ char group_name[8];
+ char reserved2[32];
+} __attribute__ ((packed));
+
+static inline int part_hdr__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct part_hdr);
+ else /* INFO_EXT */
+ return sizeof(struct x_part_hdr);
+}
+
+static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct part_hdr *)hdr)->cpus;
+ else /* INFO_EXT */
+ return ((struct x_part_hdr *)hdr)->rcpus;
+}
+
+static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
+ char *name)
+{
+ if (type == INFO_SIMPLE)
+ memcpy(name, ((struct part_hdr *)hdr)->part_name,
+ LPAR_NAME_LEN);
+ else /* INFO_EXT */
+ memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
+ LPAR_NAME_LEN);
+ EBCASC(name, LPAR_NAME_LEN);
+ name[LPAR_NAME_LEN] = 0;
+ strstrip(name);
+}
+
+struct cpu_info {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ __u8 cflag;
+ __u16 weight;
+ __u64 acc_time;
+ __u64 lp_time;
+} __attribute__ ((packed));
+
+struct x_cpu_info {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ __u8 cflag;
+ __u16 weight;
+ __u64 acc_time;
+ __u64 lp_time;
+ __u16 min_weight;
+ __u16 cur_weight;
+ __u16 max_weight;
+ char reseved2[2];
+ __u64 online_time;
+ __u64 wait_time;
+ __u32 pma_weight;
+ __u32 polar_weight;
+ char reserved3[40];
+} __attribute__ ((packed));
+
+/* CPU info block */
+
+static inline int cpu_info__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct cpu_info);
+ else /* INFO_EXT */
+ return sizeof(struct x_cpu_info);
+}
+
+static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->ctidx;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->ctidx;
+}
+
+static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->cpu_addr;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->cpu_addr;
+}
+
+static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->acc_time;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->acc_time;
+}
+
+static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->lp_time;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->lp_time;
+}
+
+static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return 0; /* online_time not available in simple info */
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->online_time;
+}
+
+/* Physical header */
+
+struct phys_hdr {
+ char reserved1[1];
+ __u8 cpus;
+ char reserved2[6];
+ char mgm_name[8];
+} __attribute__ ((packed));
+
+struct x_phys_hdr {
+ char reserved1[1];
+ __u8 cpus;
+ char reserved2[6];
+ char mgm_name[8];
+ char reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_hdr__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct phys_hdr);
+ else /* INFO_EXT */
+ return sizeof(struct x_phys_hdr);
+}
+
+static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_hdr *)hdr)->cpus;
+ else /* INFO_EXT */
+ return ((struct x_phys_hdr *)hdr)->cpus;
+}
+
+/* Physical CPU info block */
+
+struct phys_cpu {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ char reserved2[3];
+ __u64 mgm_time;
+ char reserved3[8];
+} __attribute__ ((packed));
+
+struct x_phys_cpu {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ char reserved2[3];
+ __u64 mgm_time;
+ char reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_cpu__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct phys_cpu);
+ else /* INFO_EXT */
+ return sizeof(struct x_phys_cpu);
+}
+
+static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_cpu *)hdr)->cpu_addr;
+ else /* INFO_EXT */
+ return ((struct x_phys_cpu *)hdr)->cpu_addr;
+}
+
+static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_cpu *)hdr)->mgm_time;
+ else /* INFO_EXT */
+ return ((struct x_phys_cpu *)hdr)->mgm_time;
+}
+
+static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_cpu *)hdr)->ctidx;
+ else /* INFO_EXT */
+ return ((struct x_phys_cpu *)hdr)->ctidx;
+}
+
+/* Diagnose 204 functions */
+
+static int diag204(unsigned long subcode, unsigned long size, void *addr)
+{
+ register unsigned long _subcode asm("0") = subcode;
+ register unsigned long _size asm("1") = size;
+
+ asm volatile (" diag %2,%0,0x204\n"
+ "0: \n" ".section __ex_table,\"a\"\n"
+#ifndef __s390x__
+ " .align 4\n"
+ " .long 0b,0b\n"
+#else
+ " .align 8\n"
+ " .quad 0b,0b\n"
+#endif
+ ".previous":"+d" (_subcode), "+d"(_size)
+ :"d"(addr)
+ :"memory");
+ if (_subcode)
+ return -1;
+ else
+ return _size;
+}
+
+/*
+ * For the old diag subcode 4 with simple data format we have to use real
+ * memory. If we use subcode 6 or 7 with extended data format, we can (and
+ * should) use vmalloc, since we need a lot of memory in that case. Currently
+ * up to 93 pages!
+ */
+
+static void diag204_free_buffer(void)
+{
+ if (!diag204_buf)
+ return;
+ if (diag204_buf_vmalloc) {
+ vfree(diag204_buf_vmalloc);
+ diag204_buf_vmalloc = NULL;
+ } else {
+ free_pages((unsigned long) diag204_buf, 0);
+ }
+ diag204_buf_pages = 0;
+ diag204_buf = NULL;
+}
+
+static void *diag204_alloc_vbuf(int pages)
+{
+ /* The buffer has to be page aligned! */
+ diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
+ if (!diag204_buf_vmalloc)
+ return ERR_PTR(-ENOMEM);
+ diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
+ & ~0xfffUL) + 0x1000;
+ diag204_buf_pages = pages;
+ return diag204_buf;
+}
+
+static void *diag204_alloc_rbuf(void)
+{
+ diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
+ if (diag204_buf)
+ return ERR_PTR(-ENOMEM);
+ diag204_buf_pages = 1;
+ return diag204_buf;
+}
+
+static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
+{
+ if (diag204_buf) {
+ *pages = diag204_buf_pages;
+ return diag204_buf;
+ }
+ if (fmt == INFO_SIMPLE) {
+ *pages = 1;
+ return diag204_alloc_rbuf();
+ } else {/* INFO_EXT */
+ *pages = diag204(SUBC_RSI | INFO_EXT, 0, 0);
+ if (*pages <= 0)
+ return ERR_PTR(-ENOSYS);
+ else
+ return diag204_alloc_vbuf(*pages);
+ }
+}
+
+/*
+ * diag204_probe() has to find out, which type of diagnose 204 implementation
+ * we have on our machine. Currently there are three possible scanarios:
+ * - subcode 4 + simple data format (only one page)
+ * - subcode 4-6 + extended data format
+ * - subcode 4-7 + extended data format
+ *
+ * Subcode 5 is used to retrieve the size of the data, provided by subcodes
+ * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
+ * to subcode 6 it provides also information about secondary cpus.
+ * In order to get as much information as possible, we first try
+ * subcode 7, then 6 and if both fail, we use subcode 4.
+ */
+
+static int diag204_probe(void)
+{
+ void *buf;
+ int pages, rc;
+
+ buf = diag204_get_buffer(INFO_EXT, &pages);
+ if (!IS_ERR(buf)) {
+ if (diag204(SUBC_STIB7 | INFO_EXT, pages, buf) >= 0) {
+ diag204_store_sc = SUBC_STIB7;
+ diag204_info_type = INFO_EXT;
+ goto out;
+ }
+ if (diag204(SUBC_STIB6 | INFO_EXT, pages, buf) >= 0) {
+ diag204_store_sc = SUBC_STIB7;
+ diag204_info_type = INFO_EXT;
+ goto out;
+ }
+ diag204_free_buffer();
+ }
+
+ /* subcodes 6 and 7 failed, now try subcode 4 */
+
+ buf = diag204_get_buffer(INFO_SIMPLE, &pages);
+ if (IS_ERR(buf)) {
+ rc = PTR_ERR(buf);
+ goto fail_alloc;
+ }
+ if (diag204(SUBC_STIB4 | INFO_SIMPLE, pages, buf) >= 0) {
+ diag204_store_sc = SUBC_STIB4;
+ diag204_info_type = INFO_SIMPLE;
+ goto out;
+ } else {
+ rc = -ENOSYS;
+ goto fail_store;
+ }
+out:
+ rc = 0;
+fail_store:
+ diag204_free_buffer();
+fail_alloc:
+ return rc;
+}
+
+static void *diag204_store(void)
+{
+ void *buf;
+ int pages;
+
+ buf = diag204_get_buffer(diag204_info_type, &pages);
+ if (IS_ERR(buf))
+ goto out;
+ if (diag204(diag204_store_sc | diag204_info_type, pages, buf) < 0)
+ return ERR_PTR(-ENOSYS);
+out:
+ return buf;
+}
+
+/* Diagnose 224 functions */
+
+static void diag224(void *ptr)
+{
+ asm volatile(" diag %0,%1,0x224\n"
+ : :"d" (0), "d"(ptr) : "memory");
+}
+
+static int diag224_get_name_table(void)
+{
+ /* memory must be below 2GB */
+ diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+ if (!diag224_cpu_names)
+ return -ENOMEM;
+ diag224(diag224_cpu_names);
+ EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
+ return 0;
+}
+
+static void diag224_delete_name_table(void)
+{
+ kfree(diag224_cpu_names);
+}
+
+static int diag224_idx2name(int index, char *name)
+{
+ memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
+ CPU_NAME_LEN);
+ name[CPU_NAME_LEN] = 0;
+ strstrip(name);
+ return 0;
+}
+
+__init int hypfs_diag_init(void)
+{
+ int rc;
+
+ if (diag204_probe()) {
+ printk(KERN_ERR "hypfs: diag 204 not working.");
+ return -ENODATA;
+ }
+ rc = diag224_get_name_table();
+ if (rc) {
+ diag224_delete_name_table();
+ printk(KERN_ERR "hypfs: could not get name table.\n");
+ }
+ return rc;
+}
+
+__exit void hypfs_diag_exit(void)
+{
+ diag224_delete_name_table();
+ diag204_free_buffer();
+}
+
+/*
+ * Functions to create the directory structure
+ * *******************************************
+ */
+
+static int hypfs_create_cpu_files(struct super_block *sb,
+ struct dentry *cpus_dir, void *cpu_info)
+{
+ struct dentry *cpu_dir;
+ char buffer[TMP_SIZE];
+ void *rc;
+
+ snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
+ cpu_info));
+ cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
+ rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
+ cpu_info__acc_time(diag204_info_type, cpu_info) -
+ cpu_info__lp_time(diag204_info_type, cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ rc = hypfs_create_u64(sb, cpu_dir, "cputime",
+ cpu_info__lp_time(diag204_info_type, cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ if (diag204_info_type == INFO_EXT) {
+ rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
+ cpu_info__online_time(diag204_info_type,
+ cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ }
+ diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
+ rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ return 0;
+}
+
+static void *hypfs_create_lpar_files(struct super_block *sb,
+ struct dentry *systems_dir, void *part_hdr)
+{
+ struct dentry *cpus_dir;
+ struct dentry *lpar_dir;
+ char lpar_name[LPAR_NAME_LEN + 1];
+ void *cpu_info;
+ int i;
+
+ part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
+ lpar_name[LPAR_NAME_LEN] = 0;
+ lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
+ if (IS_ERR(lpar_dir))
+ return lpar_dir;
+ cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
+ if (IS_ERR(cpus_dir))
+ return cpus_dir;
+ cpu_info = part_hdr + part_hdr__size(diag204_info_type);
+ for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
+ int rc;
+ rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
+ if (rc)
+ return ERR_PTR(rc);
+ cpu_info += cpu_info__size(diag204_info_type);
+ }
+ return cpu_info;
+}
+
+static int hypfs_create_phys_cpu_files(struct super_block *sb,
+ struct dentry *cpus_dir, void *cpu_info)
+{
+ struct dentry *cpu_dir;
+ char buffer[TMP_SIZE];
+ void *rc;
+
+ snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
+ cpu_info));
+ cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
+ if (IS_ERR(cpu_dir))
+ return PTR_ERR(cpu_dir);
+ rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
+ phys_cpu__mgm_time(diag204_info_type, cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
+ rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ return 0;
+}
+
+static void *hypfs_create_phys_files(struct super_block *sb,
+ struct dentry *parent_dir, void *phys_hdr)
+{
+ int i;
+ void *cpu_info;
+ struct dentry *cpus_dir;
+
+ cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
+ if (IS_ERR(cpus_dir))
+ return cpus_dir;
+ cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
+ for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
+ int rc;
+ rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
+ if (rc)
+ return ERR_PTR(rc);
+ cpu_info += phys_cpu__size(diag204_info_type);
+ }
+ return cpu_info;
+}
+
+int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
+{
+ struct dentry *systems_dir, *hyp_dir;
+ void *time_hdr, *part_hdr;
+ int i, rc;
+ void *buffer, *ptr;
+
+ buffer = diag204_store();
+ if (IS_ERR(buffer))
+ return PTR_ERR(buffer);
+
+ systems_dir = hypfs_mkdir(sb, root, "systems");
+ if (IS_ERR(systems_dir)) {
+ rc = PTR_ERR(systems_dir);
+ goto err_out;
+ }
+ time_hdr = (struct x_info_blk_hdr *)buffer;
+ part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
+ for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
+ part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
+ if (IS_ERR(part_hdr)) {
+ rc = PTR_ERR(part_hdr);
+ goto err_out;
+ }
+ }
+ if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
+ ptr = hypfs_create_phys_files(sb, root, part_hdr);
+ if (IS_ERR(ptr)) {
+ rc = PTR_ERR(ptr);
+ goto err_out;
+ }
+ }
+ hyp_dir = hypfs_mkdir(sb, root, "hyp");
+ if (IS_ERR(hyp_dir)) {
+ rc = PTR_ERR(hyp_dir);
+ goto err_out;
+ }
+ ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
+ if (IS_ERR(ptr)) {
+ rc = PTR_ERR(ptr);
+ goto err_out;
+ }
+ rc = 0;
+
+err_out:
+ return rc;
+}
--- /dev/null
+/*
+ * fs/hypfs/inode.c
+ * Hypervisor filesystem for Linux on s390.
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/vfs.h>
+#include <linux/pagemap.h>
+#include <linux/gfp.h>
+#include <linux/time.h>
+#include <linux/parser.h>
+#include <linux/sysfs.h>
+#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 */
+
+static struct dentry *hypfs_create_update_file(struct super_block *sb,
+ struct dentry *dir);
+
+struct hypfs_sb_info {
+ uid_t uid; /* uid used for files and dirs */
+ gid_t gid; /* gid used for files and dirs */
+ struct dentry *update_file; /* file to trigger update */
+ time_t last_update; /* last update time in secs since 1970 */
+ struct mutex lock; /* lock to protect update process */
+};
+
+static struct file_operations hypfs_file_ops;
+static struct file_system_type hypfs_type;
+static struct super_operations hypfs_s_ops;
+
+/* start of list of all dentries, which have to be deleted on update */
+static struct dentry *hypfs_last_dentry;
+
+static void hypfs_update_update(struct super_block *sb)
+{
+ struct hypfs_sb_info *sb_info = sb->s_fs_info;
+ struct inode *inode = sb_info->update_file->d_inode;
+
+ sb_info->last_update = get_seconds();
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+}
+
+/* directory tree removal functions */
+
+static void hypfs_add_dentry(struct dentry *dentry)
+{
+ dentry->d_fsdata = hypfs_last_dentry;
+ hypfs_last_dentry = dentry;
+}
+
+static void hypfs_remove(struct dentry *dentry)
+{
+ struct dentry *parent;
+
+ parent = dentry->d_parent;
+ if (S_ISDIR(dentry->d_inode->i_mode))
+ simple_rmdir(parent->d_inode, dentry);
+ else
+ simple_unlink(parent->d_inode, dentry);
+ d_delete(dentry);
+ dput(dentry);
+}
+
+static void hypfs_delete_tree(struct dentry *root)
+{
+ while (hypfs_last_dentry) {
+ struct dentry *next_dentry;
+ next_dentry = hypfs_last_dentry->d_fsdata;
+ hypfs_remove(hypfs_last_dentry);
+ hypfs_last_dentry = next_dentry;
+ }
+}
+
+static struct inode *hypfs_make_inode(struct super_block *sb, int mode)
+{
+ struct inode *ret = new_inode(sb);
+
+ if (ret) {
+ struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
+ ret->i_mode = mode;
+ ret->i_uid = hypfs_info->uid;
+ ret->i_gid = hypfs_info->gid;
+ ret->i_blksize = PAGE_CACHE_SIZE;
+ ret->i_blocks = 0;
+ ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
+ if (mode & S_IFDIR)
+ ret->i_nlink = 2;
+ else
+ ret->i_nlink = 1;
+ }
+ return ret;
+}
+
+static void hypfs_drop_inode(struct inode *inode)
+{
+ kfree(inode->u.generic_ip);
+ generic_delete_inode(inode);
+}
+
+static int hypfs_open(struct inode *inode, struct file *filp)
+{
+ char *data = filp->f_dentry->d_inode->u.generic_ip;
+ struct hypfs_sb_info *fs_info;
+
+ if (filp->f_mode & FMODE_WRITE) {
+ if (!(inode->i_mode & S_IWUGO))
+ return -EACCES;
+ }
+ if (filp->f_mode & FMODE_READ) {
+ if (!(inode->i_mode & S_IRUGO))
+ return -EACCES;
+ }
+
+ fs_info = inode->i_sb->s_fs_info;
+ if(data) {
+ mutex_lock(&fs_info->lock);
+ filp->private_data = kstrdup(data, GFP_KERNEL);
+ if (!filp->private_data) {
+ mutex_unlock(&fs_info->lock);
+ return -ENOMEM;
+ }
+ mutex_unlock(&fs_info->lock);
+ }
+ return 0;
+}
+
+static ssize_t hypfs_aio_read(struct kiocb *iocb, __user char *buf,
+ size_t count, loff_t offset)
+{
+ char *data;
+ size_t len;
+ struct file *filp = iocb->ki_filp;
+
+ data = filp->private_data;
+ len = strlen(data);
+ if (offset > len) {
+ count = 0;
+ goto out;
+ }
+ if (count > len - offset)
+ count = len - offset;
+ if (copy_to_user(buf, data + offset, count)) {
+ count = -EFAULT;
+ goto out;
+ }
+ iocb->ki_pos += count;
+ file_accessed(filp);
+out:
+ return count;
+}
+static ssize_t hypfs_aio_write(struct kiocb *iocb, const char __user *buf,
+ size_t count, loff_t pos)
+{
+ int rc;
+ struct super_block *sb;
+ struct hypfs_sb_info *fs_info;
+
+ sb = iocb->ki_filp->f_dentry->d_inode->i_sb;
+ fs_info = sb->s_fs_info;
+ /*
+ * Currently we only allow one update per second for two reasons:
+ * 1. diag 204 is VERY expensive
+ * 2. If several processes do updates in parallel and then read the
+ * hypfs data, the likelihood of collisions is reduced, if we restrict
+ * the minimum update interval. A collision occurs, if during the
+ * data gathering of one process another process triggers an update
+ * If the first process wants to ensure consistent data, it has
+ * to restart data collection in this case.
+ */
+ mutex_lock(&fs_info->lock);
+ if (fs_info->last_update == get_seconds()) {
+ rc = -EBUSY;
+ goto out;
+ }
+ hypfs_delete_tree(sb->s_root);
+ rc = hypfs_diag_create_files(sb, sb->s_root);
+ if (rc) {
+ printk(KERN_ERR "hypfs: Update failed\n");
+ hypfs_delete_tree(sb->s_root);
+ goto out;
+ }
+ hypfs_update_update(sb);
+ rc = count;
+out:
+ mutex_unlock(&fs_info->lock);
+ return rc;
+}
+
+static int hypfs_release(struct inode *inode, struct file *filp)
+{
+ kfree(filp->private_data);
+ return 0;
+}
+
+enum { opt_uid, opt_gid, opt_err };
+
+static match_table_t hypfs_tokens = {
+ {opt_uid, "uid=%u"},
+ {opt_gid, "gid=%u"},
+ {opt_err, NULL}
+};
+
+static int hypfs_parse_options(char *options, struct super_block *sb)
+{
+ char *str;
+ substring_t args[MAX_OPT_ARGS];
+
+ if (!options)
+ return 0;
+ while ((str = strsep(&options, ",")) != NULL) {
+ int token, option;
+ struct hypfs_sb_info *hypfs_info = sb->s_fs_info;
+
+ if (!*str)
+ continue;
+ token = match_token(str, hypfs_tokens, args);
+ switch (token) {
+ case opt_uid:
+ if (match_int(&args[0], &option))
+ return -EINVAL;
+ hypfs_info->uid = option;
+ break;
+ case opt_gid:
+ if (match_int(&args[0], &option))
+ return -EINVAL;
+ hypfs_info->gid = option;
+ break;
+ case opt_err:
+ default:
+ printk(KERN_ERR "hypfs: Unrecognized mount option "
+ "\"%s\" or missing value\n", str);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int hypfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct inode *root_inode;
+ struct dentry *root_dentry;
+ int rc = 0;
+ struct hypfs_sb_info *sbi;
+
+ sbi = kzalloc(sizeof(struct hypfs_sb_info), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+ mutex_init(&sbi->lock);
+ sbi->uid = current->uid;
+ sbi->gid = current->gid;
+ sb->s_fs_info = sbi;
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = HYPFS_MAGIC;
+ sb->s_op = &hypfs_s_ops;
+ if (hypfs_parse_options(data, sb)) {
+ rc = -EINVAL;
+ goto err_alloc;
+ }
+ root_inode = hypfs_make_inode(sb, S_IFDIR | 0755);
+ if (!root_inode) {
+ rc = -ENOMEM;
+ goto err_alloc;
+ }
+ root_inode->i_op = &simple_dir_inode_operations;
+ root_inode->i_fop = &simple_dir_operations;
+ root_dentry = d_alloc_root(root_inode);
+ if (!root_dentry) {
+ iput(root_inode);
+ rc = -ENOMEM;
+ goto err_alloc;
+ }
+ rc = hypfs_diag_create_files(sb, root_dentry);
+ if (rc)
+ goto err_tree;
+ sbi->update_file = hypfs_create_update_file(sb, root_dentry);
+ if (IS_ERR(sbi->update_file)) {
+ rc = PTR_ERR(sbi->update_file);
+ goto err_tree;
+ }
+ hypfs_update_update(sb);
+ sb->s_root = root_dentry;
+ return 0;
+
+err_tree:
+ hypfs_delete_tree(root_dentry);
+ d_genocide(root_dentry);
+ dput(root_dentry);
+err_alloc:
+ kfree(sbi);
+ return rc;
+}
+
+static struct super_block *hypfs_get_super(struct file_system_type *fst,
+ int flags, const char *devname,
+ void *data)
+{
+ return get_sb_single(fst, flags, data, hypfs_fill_super);
+}
+
+static void hypfs_kill_super(struct super_block *sb)
+{
+ struct hypfs_sb_info *sb_info = sb->s_fs_info;
+
+ hypfs_delete_tree(sb->s_root);
+ hypfs_remove(sb_info->update_file);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ kill_litter_super(sb);
+}
+
+static struct dentry *hypfs_create_file(struct super_block *sb,
+ struct dentry *parent, const char *name,
+ char *data, mode_t mode)
+{
+ struct dentry *dentry;
+ struct inode *inode;
+ struct qstr qname;
+
+ qname.name = name;
+ qname.len = strlen(name);
+ qname.hash = full_name_hash(name, qname.len);
+ dentry = lookup_one_len(name, parent, strlen(name));
+ if (IS_ERR(dentry))
+ return ERR_PTR(-ENOMEM);
+ inode = hypfs_make_inode(sb, mode);
+ if (!inode) {
+ dput(dentry);
+ return ERR_PTR(-ENOMEM);
+ }
+ if (mode & S_IFREG) {
+ inode->i_fop = &hypfs_file_ops;
+ if (data)
+ inode->i_size = strlen(data);
+ else
+ inode->i_size = 0;
+ } else if (mode & S_IFDIR) {
+ inode->i_op = &simple_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ parent->d_inode->i_nlink++;
+ } else
+ BUG();
+ inode->u.generic_ip = data;
+ d_instantiate(dentry, inode);
+ dget(dentry);
+ return dentry;
+}
+
+struct dentry *hypfs_mkdir(struct super_block *sb, struct dentry *parent,
+ const char *name)
+{
+ struct dentry *dentry;
+
+ dentry = hypfs_create_file(sb, parent, name, NULL, S_IFDIR | DIR_MODE);
+ if (IS_ERR(dentry))
+ return dentry;
+ hypfs_add_dentry(dentry);
+ parent->d_inode->i_nlink++;
+ return dentry;
+}
+
+static struct dentry *hypfs_create_update_file(struct super_block *sb,
+ struct dentry *dir)
+{
+ struct dentry *dentry;
+
+ dentry = hypfs_create_file(sb, dir, "update", NULL,
+ S_IFREG | UPDATE_FILE_MODE);
+ /*
+ * We do not put the update file on the 'delete' list with
+ * hypfs_add_dentry(), since it should not be removed when the tree
+ * is updated.
+ */
+ return dentry;
+}
+
+struct dentry *hypfs_create_u64(struct super_block *sb, struct dentry *dir,
+ const char *name, __u64 value)
+{
+ char *buffer;
+ char tmp[TMP_SIZE];
+ struct dentry *dentry;
+
+ snprintf(tmp, TMP_SIZE, "%lld\n", (unsigned long long int)value);
+ buffer = kstrdup(tmp, GFP_KERNEL);
+ if (!buffer)
+ return ERR_PTR(-ENOMEM);
+ dentry =
+ hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
+ if (IS_ERR(dentry)) {
+ kfree(buffer);
+ return ERR_PTR(-ENOMEM);
+ }
+ hypfs_add_dentry(dentry);
+ return dentry;
+}
+
+struct dentry *hypfs_create_str(struct super_block *sb, struct dentry *dir,
+ const char *name, char *string)
+{
+ char *buffer;
+ struct dentry *dentry;
+
+ buffer = kmalloc(strlen(string) + 2, GFP_KERNEL);
+ if (!buffer)
+ return ERR_PTR(-ENOMEM);
+ sprintf(buffer, "%s\n", string);
+ dentry =
+ hypfs_create_file(sb, dir, name, buffer, S_IFREG | REG_FILE_MODE);
+ if (IS_ERR(dentry)) {
+ kfree(buffer);
+ return ERR_PTR(-ENOMEM);
+ }
+ hypfs_add_dentry(dentry);
+ return dentry;
+}
+
+static struct file_operations hypfs_file_ops = {
+ .open = hypfs_open,
+ .release = hypfs_release,
+ .read = do_sync_read,
+ .write = do_sync_write,
+ .aio_read = hypfs_aio_read,
+ .aio_write = hypfs_aio_write,
+};
+
+static struct file_system_type hypfs_type = {
+ .owner = THIS_MODULE,
+ .name = "s390_hypfs",
+ .get_sb = hypfs_get_super,
+ .kill_sb = hypfs_kill_super
+};
+
+static struct super_operations hypfs_s_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = hypfs_drop_inode,
+};
+
+static decl_subsys(s390, NULL, NULL);
+
+static int __init hypfs_init(void)
+{
+ int rc;
+
+ if (MACHINE_IS_VM)
+ return -ENODATA;
+ if (hypfs_diag_init()) {
+ rc = -ENODATA;
+ goto fail_diag;
+ }
+ kset_set_kset_s(&s390_subsys, hypervisor_subsys);
+ rc = subsystem_register(&s390_subsys);
+ if (rc)
+ goto fail_sysfs;
+ rc = register_filesystem(&hypfs_type);
+ if (rc)
+ goto fail_filesystem;
+ return 0;
+
+fail_filesystem:
+ subsystem_unregister(&s390_subsys);
+fail_sysfs:
+ hypfs_diag_exit();
+fail_diag:
+ printk(KERN_ERR "hypfs: Initialization failed with rc = %i.\n", rc);
+ return rc;
+}
+
+static void __exit hypfs_exit(void)
+{
+ hypfs_diag_exit();
+ unregister_filesystem(&hypfs_type);
+ subsystem_unregister(&s390_subsys);
+}
+
+module_init(hypfs_init)
+module_exit(hypfs_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michael Holzheu <holzheu@de.ibm.com>");
+MODULE_DESCRIPTION("s390 Hypervisor Filesystem");
projects / linux-2.6 / commitdiff