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https://github.com/tbsdtv/linux_media.git
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af8890e8f6
no_llseek had been defined to NULL two years ago, in commit 868941b
("fs: remove no_llseek")
To quote that commit,
At -rc1 we'll need do a mechanical removal of no_llseek -
git grep -l -w no_llseek | grep -v porting.rst | while read i; do
sed -i '/\<no_llseek\>/d' $i
done
would do it.
Unfortunately, that hadn't been done. Linus, could you do that now, so
that we could finally put that thing to rest? All instances are of the
form
.llseek = no_llseek,
so it's obviously safe.
101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
// 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 <holzheu@linux.vnet.ibm.com>
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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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.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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