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-rw-r--r--arch/s390/hypfs/Makefile2
-rw-r--r--arch/s390/hypfs/hypfs.h33
-rw-r--r--arch/s390/hypfs/hypfs_dbfs.c116
-rw-r--r--arch/s390/hypfs/hypfs_diag.c82
-rw-r--r--arch/s390/hypfs/hypfs_vm.c62
-rw-r--r--arch/s390/hypfs/inode.c18
6 files changed, 195 insertions, 118 deletions
diff --git a/arch/s390/hypfs/Makefile b/arch/s390/hypfs/Makefile
index b08d2abf6178..2e671d5004ca 100644
--- a/arch/s390/hypfs/Makefile
+++ b/arch/s390/hypfs/Makefile
@@ -4,4 +4,4 @@
obj-$(CONFIG_S390_HYPFS_FS) += s390_hypfs.o
-s390_hypfs-objs := inode.o hypfs_diag.o hypfs_vm.o
+s390_hypfs-objs := inode.o hypfs_diag.o hypfs_vm.o hypfs_dbfs.o
diff --git a/arch/s390/hypfs/hypfs.h b/arch/s390/hypfs/hypfs.h
index fa487d4cc08b..80c1526f2af3 100644
--- a/arch/s390/hypfs/hypfs.h
+++ b/arch/s390/hypfs/hypfs.h
@@ -12,6 +12,8 @@
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/debugfs.h>
+#include <linux/workqueue.h>
+#include <linux/kref.h>
#define REG_FILE_MODE 0440
#define UPDATE_FILE_MODE 0220
@@ -38,6 +40,33 @@ extern int hypfs_vm_init(void);
extern void hypfs_vm_exit(void);
extern int hypfs_vm_create_files(struct super_block *sb, struct dentry *root);
-/* Directory for debugfs files */
-extern struct dentry *hypfs_dbfs_dir;
+/* debugfs interface */
+struct hypfs_dbfs_file;
+
+struct hypfs_dbfs_data {
+ void *buf;
+ void *buf_free_ptr;
+ size_t size;
+ struct hypfs_dbfs_file *dbfs_file;;
+ struct kref kref;
+};
+
+struct hypfs_dbfs_file {
+ const char *name;
+ int (*data_create)(void **data, void **data_free_ptr,
+ size_t *size);
+ void (*data_free)(const void *buf_free_ptr);
+
+ /* Private data for hypfs_dbfs.c */
+ struct hypfs_dbfs_data *data;
+ struct delayed_work data_free_work;
+ struct mutex lock;
+ struct dentry *dentry;
+};
+
+extern int hypfs_dbfs_init(void);
+extern void hypfs_dbfs_exit(void);
+extern int hypfs_dbfs_create_file(struct hypfs_dbfs_file *df);
+extern void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df);
+
#endif /* _HYPFS_H_ */
diff --git a/arch/s390/hypfs/hypfs_dbfs.c b/arch/s390/hypfs/hypfs_dbfs.c
new file mode 100644
index 000000000000..b478013b7fec
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_dbfs.c
@@ -0,0 +1,116 @@
+/*
+ * Hypervisor filesystem for Linux on s390 - debugfs interface
+ *
+ * Copyright (C) IBM Corp. 2010
+ * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#include <linux/slab.h>
+#include "hypfs.h"
+
+static struct dentry *dbfs_dir;
+
+static struct hypfs_dbfs_data *hypfs_dbfs_data_alloc(struct hypfs_dbfs_file *f)
+{
+ struct hypfs_dbfs_data *data;
+
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+ kref_init(&data->kref);
+ data->dbfs_file = f;
+ return data;
+}
+
+static void hypfs_dbfs_data_free(struct kref *kref)
+{
+ struct hypfs_dbfs_data *data;
+
+ data = container_of(kref, struct hypfs_dbfs_data, kref);
+ data->dbfs_file->data_free(data->buf_free_ptr);
+ kfree(data);
+}
+
+static void data_free_delayed(struct work_struct *work)
+{
+ struct hypfs_dbfs_data *data;
+ struct hypfs_dbfs_file *df;
+
+ df = container_of(work, struct hypfs_dbfs_file, data_free_work.work);
+ mutex_lock(&df->lock);
+ data = df->data;
+ df->data = NULL;
+ mutex_unlock(&df->lock);
+ kref_put(&data->kref, hypfs_dbfs_data_free);
+}
+
+static ssize_t dbfs_read(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct hypfs_dbfs_data *data;
+ struct hypfs_dbfs_file *df;
+ ssize_t rc;
+
+ if (*ppos != 0)
+ return 0;
+
+ df = file->f_path.dentry->d_inode->i_private;
+ mutex_lock(&df->lock);
+ if (!df->data) {
+ data = hypfs_dbfs_data_alloc(df);
+ if (!data) {
+ mutex_unlock(&df->lock);
+ return -ENOMEM;
+ }
+ rc = df->data_create(&data->buf, &data->buf_free_ptr,
+ &data->size);
+ if (rc) {
+ mutex_unlock(&df->lock);
+ kfree(data);
+ return rc;
+ }
+ df->data = data;
+ schedule_delayed_work(&df->data_free_work, HZ);
+ }
+ data = df->data;
+ kref_get(&data->kref);
+ mutex_unlock(&df->lock);
+
+ rc = simple_read_from_buffer(buf, size, ppos, data->buf, data->size);
+ kref_put(&data->kref, hypfs_dbfs_data_free);
+ return rc;
+}
+
+static const struct file_operations dbfs_ops = {
+ .read = dbfs_read,
+ .llseek = no_llseek,
+};
+
+int hypfs_dbfs_create_file(struct hypfs_dbfs_file *df)
+{
+ df->dentry = debugfs_create_file(df->name, 0400, dbfs_dir, df,
+ &dbfs_ops);
+ if (IS_ERR(df->dentry))
+ return PTR_ERR(df->dentry);
+ mutex_init(&df->lock);
+ INIT_DELAYED_WORK(&df->data_free_work, data_free_delayed);
+ return 0;
+}
+
+void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df)
+{
+ debugfs_remove(df->dentry);
+}
+
+int hypfs_dbfs_init(void)
+{
+ dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
+ if (IS_ERR(dbfs_dir))
+ return PTR_ERR(dbfs_dir);
+ return 0;
+}
+
+void hypfs_dbfs_exit(void)
+{
+ debugfs_remove(dbfs_dir);
+}
diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c
index cd4a81be9cf8..6023c6dc1fb7 100644
--- a/arch/s390/hypfs/hypfs_diag.c
+++ b/arch/s390/hypfs/hypfs_diag.c
@@ -555,81 +555,38 @@ struct dbfs_d204 {
char buf[]; /* d204 buffer */
} __attribute__ ((packed));
-struct dbfs_d204_private {
- struct dbfs_d204 *d204; /* Aligned d204 data with header */
- void *base; /* Base pointer (needed for vfree) */
-};
-
-static int dbfs_d204_open(struct inode *inode, struct file *file)
+static int dbfs_d204_create(void **data, void **data_free_ptr, size_t *size)
{
- struct dbfs_d204_private *data;
struct dbfs_d204 *d204;
int rc, buf_size;
+ void *base;
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
buf_size = PAGE_SIZE * (diag204_buf_pages + 1) + sizeof(d204->hdr);
- data->base = vmalloc(buf_size);
- if (!data->base) {
- rc = -ENOMEM;
- goto fail_kfree_data;
+ base = vmalloc(buf_size);
+ if (!base)
+ return -ENOMEM;
+ memset(base, 0, buf_size);
+ d204 = page_align_ptr(base + sizeof(d204->hdr)) - sizeof(d204->hdr);
+ rc = diag204_do_store(d204->buf, diag204_buf_pages);
+ if (rc) {
+ vfree(base);
+ return rc;
}
- memset(data->base, 0, buf_size);
- d204 = page_align_ptr(data->base + sizeof(d204->hdr))
- - sizeof(d204->hdr);
- rc = diag204_do_store(&d204->buf, diag204_buf_pages);
- if (rc)
- goto fail_vfree_base;
d204->hdr.version = DBFS_D204_HDR_VERSION;
d204->hdr.len = PAGE_SIZE * diag204_buf_pages;
d204->hdr.sc = diag204_store_sc;
- data->d204 = d204;
- file->private_data = data;
- return nonseekable_open(inode, file);
-
-fail_vfree_base:
- vfree(data->base);
-fail_kfree_data:
- kfree(data);
- return rc;
-}
-
-static int dbfs_d204_release(struct inode *inode, struct file *file)
-{
- struct dbfs_d204_private *data = file->private_data;
-
- vfree(data->base);
- kfree(data);
+ *data = d204;
+ *data_free_ptr = base;
+ *size = d204->hdr.len + sizeof(struct dbfs_d204_hdr);
return 0;
}
-static ssize_t dbfs_d204_read(struct file *file, char __user *buf,
- size_t size, loff_t *ppos)
-{
- struct dbfs_d204_private *data = file->private_data;
-
- return simple_read_from_buffer(buf, size, ppos, data->d204,
- data->d204->hdr.len +
- sizeof(data->d204->hdr));
-}
-
-static const struct file_operations dbfs_d204_ops = {
- .open = dbfs_d204_open,
- .read = dbfs_d204_read,
- .release = dbfs_d204_release,
- .llseek = no_llseek,
+static struct hypfs_dbfs_file dbfs_file_d204 = {
+ .name = "diag_204",
+ .data_create = dbfs_d204_create,
+ .data_free = vfree,
};
-static int hypfs_dbfs_init(void)
-{
- dbfs_d204_file = debugfs_create_file("diag_204", 0400, hypfs_dbfs_dir,
- NULL, &dbfs_d204_ops);
- if (IS_ERR(dbfs_d204_file))
- return PTR_ERR(dbfs_d204_file);
- return 0;
-}
-
__init int hypfs_diag_init(void)
{
int rc;
@@ -639,7 +596,7 @@ __init int hypfs_diag_init(void)
return -ENODATA;
}
if (diag204_info_type == INFO_EXT) {
- rc = hypfs_dbfs_init();
+ rc = hypfs_dbfs_create_file(&dbfs_file_d204);
if (rc)
return rc;
}
@@ -660,6 +617,7 @@ void hypfs_diag_exit(void)
debugfs_remove(dbfs_d204_file);
diag224_delete_name_table();
diag204_free_buffer();
+ hypfs_dbfs_remove_file(&dbfs_file_d204);
}
/*
diff --git a/arch/s390/hypfs/hypfs_vm.c b/arch/s390/hypfs/hypfs_vm.c
index 26cf177f6a3a..e54796002f61 100644
--- a/arch/s390/hypfs/hypfs_vm.c
+++ b/arch/s390/hypfs/hypfs_vm.c
@@ -20,8 +20,6 @@ static char local_guest[] = " ";
static char all_guests[] = "* ";
static char *guest_query;
-static struct dentry *dbfs_d2fc_file;
-
struct diag2fc_data {
__u32 version;
__u32 flags;
@@ -104,7 +102,7 @@ static void *diag2fc_store(char *query, unsigned int *count, int offset)
return data;
}
-static void diag2fc_free(void *data)
+static void diag2fc_free(const void *data)
{
vfree(data);
}
@@ -239,43 +237,29 @@ struct dbfs_d2fc {
char buf[]; /* d2fc buffer */
} __attribute__ ((packed));
-static int dbfs_d2fc_open(struct inode *inode, struct file *file)
+static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
{
- struct dbfs_d2fc *data;
+ struct dbfs_d2fc *d2fc;
unsigned int count;
- data = diag2fc_store(guest_query, &count, sizeof(data->hdr));
- if (IS_ERR(data))
- return PTR_ERR(data);
- get_clock_ext(data->hdr.tod_ext);
- data->hdr.len = count * sizeof(struct diag2fc_data);
- data->hdr.version = DBFS_D2FC_HDR_VERSION;
- data->hdr.count = count;
- memset(&data->hdr.reserved, 0, sizeof(data->hdr.reserved));
- file->private_data = data;
- return nonseekable_open(inode, file);
-}
-
-static int dbfs_d2fc_release(struct inode *inode, struct file *file)
-{
- diag2fc_free(file->private_data);
+ d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
+ if (IS_ERR(d2fc))
+ return PTR_ERR(d2fc);
+ get_clock_ext(d2fc->hdr.tod_ext);
+ d2fc->hdr.len = count * sizeof(struct diag2fc_data);
+ d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
+ d2fc->hdr.count = count;
+ memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
+ *data = d2fc;
+ *data_free_ptr = d2fc;
+ *size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
return 0;
}
-static ssize_t dbfs_d2fc_read(struct file *file, char __user *buf,
- size_t size, loff_t *ppos)
-{
- struct dbfs_d2fc *data = file->private_data;
-
- return simple_read_from_buffer(buf, size, ppos, data, data->hdr.len +
- sizeof(struct dbfs_d2fc_hdr));
-}
-
-static const struct file_operations dbfs_d2fc_ops = {
- .open = dbfs_d2fc_open,
- .read = dbfs_d2fc_read,
- .release = dbfs_d2fc_release,
- .llseek = no_llseek,
+static struct hypfs_dbfs_file dbfs_file_2fc = {
+ .name = "diag_2fc",
+ .data_create = dbfs_diag2fc_create,
+ .data_free = diag2fc_free,
};
int hypfs_vm_init(void)
@@ -288,18 +272,12 @@ int hypfs_vm_init(void)
guest_query = local_guest;
else
return -EACCES;
-
- dbfs_d2fc_file = debugfs_create_file("diag_2fc", 0400, hypfs_dbfs_dir,
- NULL, &dbfs_d2fc_ops);
- if (IS_ERR(dbfs_d2fc_file))
- return PTR_ERR(dbfs_d2fc_file);
-
- return 0;
+ return hypfs_dbfs_create_file(&dbfs_file_2fc);
}
void hypfs_vm_exit(void)
{
if (!MACHINE_IS_VM)
return;
- debugfs_remove(dbfs_d2fc_file);
+ hypfs_dbfs_remove_file(&dbfs_file_2fc);
}
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 47cc446dab8f..6fe874fc5f8e 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -46,8 +46,6 @@ static const 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;
-struct dentry *hypfs_dbfs_dir;
-
static void hypfs_update_update(struct super_block *sb)
{
struct hypfs_sb_info *sb_info = sb->s_fs_info;
@@ -471,13 +469,12 @@ static int __init hypfs_init(void)
{
int rc;
- hypfs_dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
- if (IS_ERR(hypfs_dbfs_dir))
- return PTR_ERR(hypfs_dbfs_dir);
-
+ rc = hypfs_dbfs_init();
+ if (rc)
+ return rc;
if (hypfs_diag_init()) {
rc = -ENODATA;
- goto fail_debugfs_remove;
+ goto fail_dbfs_exit;
}
if (hypfs_vm_init()) {
rc = -ENODATA;
@@ -499,9 +496,8 @@ fail_hypfs_vm_exit:
hypfs_vm_exit();
fail_hypfs_diag_exit:
hypfs_diag_exit();
-fail_debugfs_remove:
- debugfs_remove(hypfs_dbfs_dir);
-
+fail_dbfs_exit:
+ hypfs_dbfs_exit();
pr_err("Initialization of hypfs failed with rc=%i\n", rc);
return rc;
}
@@ -510,7 +506,7 @@ static void __exit hypfs_exit(void)
{
hypfs_diag_exit();
hypfs_vm_exit();
- debugfs_remove(hypfs_dbfs_dir);
+ hypfs_dbfs_exit();
unregister_filesystem(&hypfs_type);
kobject_put(s390_kobj);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.