d9dda78bad
The only part of proc_dir_entry the code outside of fs/proc really cares about is PDE(inode)->data. Provide a helper for that; static inline for now, eventually will be moved to fs/proc, along with the knowledge of struct proc_dir_entry layout. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
#include <linux/slab.h>
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#include <linux/proc_fs.h>
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#include <asm/setup.h>
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#include <asm/types.h>
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#include <asm/page.h>
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struct buffer {
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size_t size;
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char data[];
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};
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static ssize_t atags_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct buffer *b = PDE_DATA(file_inode(file));
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return simple_read_from_buffer(buf, count, ppos, b->data, b->size);
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}
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static const struct file_operations atags_fops = {
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.read = atags_read,
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.llseek = default_llseek,
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};
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#define BOOT_PARAMS_SIZE 1536
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static char __initdata atags_copy[BOOT_PARAMS_SIZE];
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void __init save_atags(const struct tag *tags)
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{
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memcpy(atags_copy, tags, sizeof(atags_copy));
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}
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static int __init init_atags_procfs(void)
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{
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/*
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* This cannot go into save_atags() because kmalloc and proc don't work
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* yet when it is called.
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*/
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struct proc_dir_entry *tags_entry;
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struct tag *tag = (struct tag *)atags_copy;
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struct buffer *b;
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size_t size;
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if (tag->hdr.tag != ATAG_CORE) {
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printk(KERN_INFO "No ATAGs?");
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return -EINVAL;
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}
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for (; tag->hdr.size; tag = tag_next(tag))
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;
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/* include the terminating ATAG_NONE */
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size = (char *)tag - atags_copy + sizeof(struct tag_header);
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WARN_ON(tag->hdr.tag != ATAG_NONE);
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b = kmalloc(sizeof(*b) + size, GFP_KERNEL);
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if (!b)
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goto nomem;
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b->size = size;
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memcpy(b->data, atags_copy, size);
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tags_entry = proc_create_data("atags", 0400, NULL, &atags_fops, b);
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if (!tags_entry)
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goto nomem;
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return 0;
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nomem:
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kfree(b);
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printk(KERN_ERR "Exporting ATAGs: not enough memory\n");
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return -ENOMEM;
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}
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arch_initcall(init_atags_procfs);
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