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/*
* linux/fs/umsdos/check.c
*
* Sanity-checking code
*/
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/umsdos_fs.h>
#include <asm/system.h>
#ifdef CHECK_PAGE_TABLES
static int check_one_table (struct pde *page_dir)
{
if (pgd_none (*page_dir))
return 0;
if (pgd_bad (*page_dir))
return 1;
return 0;
}
/*
* This function checks all page tables of "current"
*/
void check_page_tables (void)
{
struct pgd *pg_dir;
static int err = 0;
int stack_level = (long) (&pg_dir) - current->kernel_stack_page;
if (stack_level < 1500)
printk ("** %d ** ", stack_level);
pg_dir = PAGE_DIR_OFFSET (current, 0);
if (err == 0) {
int i;
for (i = 0; i < PTRS_PER_PAGE; i++, page_dir++) {
int notok = check_one_table (page_dir);
if (notok) {
err++;
printk ("|%d:%08lx| ", i, page_dir->pgd);
}
}
if (err)
printk ("\nError MM %d\n", err);
}
}
#endif
#if UMS_DEBUG
/*
* check a superblock
*/
void check_sb (struct super_block *sb, const char c)
{
if (sb) {
printk (" (has %c_sb=%d, %d)",
c, MAJOR (sb->s_dev), MINOR (sb->s_dev));
} else {
printk (" (%c_sb is NULL)", c);
}
}
/*
* check an inode
*/
extern struct inode_operations umsdos_rdir_inode_operations;
void check_inode (struct inode *inode)
{
if (inode) {
printk (KERN_DEBUG "* inode is %lu (i_count=%d)",
inode->i_ino, inode->i_count);
check_sb (inode->i_sb, 'i');
if (inode->i_dentry.next) { /* FIXME: does this work ? */
printk (" (has i_dentry)");
} else {
printk (" (NO i_dentry)");
}
printk (" (i_patched=%d)", inode->u.umsdos_i.i_patched);
if (inode->i_op == NULL) {
printk (" (i_op is NULL)\n");
} else if (inode->i_op == &umsdos_dir_inode_operations) {
printk (" (i_op is umsdos_dir_inode_operations)\n");
} else if (inode->i_op == &umsdos_file_inode_operations) {
printk (" (i_op is umsdos_file_inode_operations)\n");
} else if (inode->i_op == &umsdos_file_inode_operations_no_bmap) {
printk (" (i_op is umsdos_file_inode_operations_no_bmap)\n");
} else if (inode->i_op == &umsdos_file_inode_operations_readpage) {
printk (" (i_op is umsdos_file_inode_operations_readpage)\n");
} else if (inode->i_op == &umsdos_rdir_inode_operations) {
printk (" (i_op is umsdos_rdir_inode_operations)\n");
} else if (inode->i_op == &umsdos_symlink_inode_operations) {
printk (" (i_op is umsdos_symlink_inode_operations)\n");
} else {
printk ((" (i_op is UNKNOWN: %p)\n", inode->i_op));
}
} else {
printk (KERN_DEBUG "* inode is NULL\n");
}
}
/*
* checks all inode->i_dentry
*
*/
void checkd_inode (struct inode *inode)
{
struct dentry *ret;
struct list_head *cur;
int count = 0;
if (!inode) {
printk (KERN_ERR "checkd_inode: inode is NULL!\n");
return;
}
printk (KERN_DEBUG "checkd_inode: inode %lu\n", inode->i_ino);
cur = inode->i_dentry.next;
while (count++ < 10) {
PRINTK (("1..."));
if (!cur) {
printk (KERN_ERR "checkd_inode: *** NULL reached. exit.\n");
return;
}
PRINTK (("2..."));
ret = list_entry (cur, struct dentry, d_alias);
PRINTK (("3..."));
if (cur == cur->next) {
printk (KERN_DEBUG "checkd_inode: *** cur=cur->next: normal exit.\n");
return;
}
PRINTK (("4..."));
if (!ret) {
printk (KERN_ERR "checkd_inode: *** ret dentry is NULL. exit.\n");
return;
}
PRINTK (("5... (ret=%p)...", ret));
PRINTK (("5.1.. (ret->d_dname=%p)...", &(ret->d_name)));
PRINTK (("5.1.1. (ret->d_dname.len=%d)...", (int) ret->d_name.len));
PRINTK (("5.1.2. (ret->d_dname.name=%c)...", ret->d_name.name));
printk (KERN_DEBUG "checkd_inode: i_dentry is %.*s\n", (int) ret->d_name.len, ret->d_name.name);
PRINTK (("6..."));
cur = cur->next;
PRINTK (("7..."));
#if 1
printk (KERN_DEBUG "checkd_inode: *** finished after count 1 (operator forced)\n");
return;
#endif
}
printk (KERN_ERR "checkd_inode: *** OVER LIMIT (loop?) !\n");
return;
}
/*
* internal part of check_dentry. does the real job.
*
*/
void check_dent_int (struct dentry *dentry, int parent)
{
if (parent) {
printk (KERN_DEBUG "* parent(%d) dentry: %.*s\n",
parent, (int) dentry->d_name.len, dentry->d_name.name);
} else {
printk (KERN_DEBUG "* checking dentry: %.*s\n",
(int) dentry->d_name.len, dentry->d_name.name);
}
check_inode (dentry->d_inode);
printk (KERN_DEBUG "* d_count=%d", dentry->d_count);
check_sb (dentry->d_sb, 'd');
if (dentry->d_op == NULL) {
printk (" (d_op is NULL)\n");
} else {
printk (" (d_op is UNKNOWN: %p)\n", dentry->d_op);
}
}
/*
* checks dentry with full traceback to root and prints info. Limited to 10 recursive depths to avoid infinite loops.
*
*/
void check_dentry_path (struct dentry *dentry, const char *desc)
{
int count=0;
printk (KERN_DEBUG "*** check_dentry_path: %.60s\n", desc);
if (!dentry) {
printk (KERN_DEBUG "*** checking dentry... it is NULL !\n");
return;
}
if (IS_ERR(dentry)) {
printk (KERN_DEBUG "*** checking dentry... it is ERR(%ld) !\n",
PTR_ERR(dentry));
return;
}
while (dentry && count < 10) {
check_dent_int (dentry, count++);
if (dentry == dentry->d_parent) {
printk (KERN_DEBUG "*** end checking dentry (root reached ok)\n");
break;
}
dentry = dentry->d_parent;
}
if (count >= 10) { /* if infinite loop detected */
printk (KERN_ERR
"*** WARNING ! INFINITE LOOP ! check_dentry_path aborted !\n");
}
if (!dentry) {
printk (KERN_ERR
"*** WARNING ! NULL dentry ! check_dentry_path aborted !\n");
}
}
#else
void check_sb (struct super_block *sb, const char c) {};
void check_inode (struct inode *inode) {};
void checkd_inode (struct inode *inode) {};
void check_dentry_path (struct dentry *dentry, const char *desc) {};
#endif /* UMS_DEBUG */
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