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101 lines
2.0 KiB
101 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Hypervisor filesystem for Linux on s390 - debugfs interface |
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* |
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* Copyright IBM Corp. 2010 |
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* Author(s): Michael Holzheu <[email protected]> |
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*/ |
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#include <linux/slab.h> |
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#include "hypfs.h" |
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static struct dentry *dbfs_dir; |
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static struct hypfs_dbfs_data *hypfs_dbfs_data_alloc(struct hypfs_dbfs_file *f) |
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{ |
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struct hypfs_dbfs_data *data; |
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data = kmalloc(sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return NULL; |
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data->dbfs_file = f; |
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return data; |
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} |
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static void hypfs_dbfs_data_free(struct hypfs_dbfs_data *data) |
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{ |
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data->dbfs_file->data_free(data->buf_free_ptr); |
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kfree(data); |
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} |
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static ssize_t dbfs_read(struct file *file, char __user *buf, |
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size_t size, loff_t *ppos) |
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{ |
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struct hypfs_dbfs_data *data; |
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struct hypfs_dbfs_file *df; |
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ssize_t rc; |
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if (*ppos != 0) |
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return 0; |
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df = file_inode(file)->i_private; |
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mutex_lock(&df->lock); |
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data = hypfs_dbfs_data_alloc(df); |
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if (!data) { |
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mutex_unlock(&df->lock); |
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return -ENOMEM; |
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} |
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rc = df->data_create(&data->buf, &data->buf_free_ptr, &data->size); |
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if (rc) { |
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mutex_unlock(&df->lock); |
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kfree(data); |
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return rc; |
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} |
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mutex_unlock(&df->lock); |
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rc = simple_read_from_buffer(buf, size, ppos, data->buf, data->size); |
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hypfs_dbfs_data_free(data); |
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return rc; |
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} |
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static long dbfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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{ |
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struct hypfs_dbfs_file *df = file_inode(file)->i_private; |
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long rc; |
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mutex_lock(&df->lock); |
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if (df->unlocked_ioctl) |
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rc = df->unlocked_ioctl(file, cmd, arg); |
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else |
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rc = -ENOTTY; |
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mutex_unlock(&df->lock); |
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return rc; |
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} |
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static const struct file_operations dbfs_ops = { |
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.read = dbfs_read, |
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.llseek = no_llseek, |
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.unlocked_ioctl = dbfs_ioctl, |
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}; |
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void hypfs_dbfs_create_file(struct hypfs_dbfs_file *df) |
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{ |
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df->dentry = debugfs_create_file(df->name, 0400, dbfs_dir, df, |
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&dbfs_ops); |
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mutex_init(&df->lock); |
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} |
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void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df) |
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{ |
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debugfs_remove(df->dentry); |
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} |
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void hypfs_dbfs_init(void) |
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{ |
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dbfs_dir = debugfs_create_dir("s390_hypfs", NULL); |
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} |
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void hypfs_dbfs_exit(void) |
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{ |
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debugfs_remove(dbfs_dir); |
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}
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