Revision f6771dbb27c704ce837ba3bb1dcaa53f48f76ea8 authored by Ralf Baechle on 08 November 2007, 18:02:29 UTC, committed by Ralf Baechle on 15 November 2007, 23:21:49 UTC
Shadow register support would not possibly have worked on multicore systems. The support code for it was also depending not on MIPS R2 but VSMP or SMTC kernels even though it makes perfect sense with UP kernels. SR sets are a scarce resource and the expected usage pattern is that users actually hardcode the register set numbers in their code. So fix the allocator by ditching it. Move the remaining CPU probe bits into the generic CPU probe. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent efb9ca0
namei.c
/*
* QNX4 file system, Linux implementation.
*
* Version : 0.2.1
*
* Using parts of the xiafs filesystem.
*
* History :
*
* 01-06-1998 by Richard Frowijn : first release.
* 21-06-1998 by Frank Denis : dcache support, fixed error codes.
* 04-07-1998 by Frank Denis : first step for rmdir/unlink.
*/
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/qnx4_fs.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/errno.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
/*
* check if the filename is correct. For some obscure reason, qnx writes a
* new file twice in the directory entry, first with all possible options at 0
* and for a second time the way it is, they want us not to access the qnx
* filesystem when whe are using linux.
*/
static int qnx4_match(int len, const char *name,
struct buffer_head *bh, unsigned long *offset)
{
struct qnx4_inode_entry *de;
int namelen, thislen;
if (bh == NULL) {
printk("qnx4: matching unassigned buffer !\n");
return 0;
}
de = (struct qnx4_inode_entry *) (bh->b_data + *offset);
*offset += QNX4_DIR_ENTRY_SIZE;
if ((de->di_status & QNX4_FILE_LINK) != 0) {
namelen = QNX4_NAME_MAX;
} else {
namelen = QNX4_SHORT_NAME_MAX;
}
/* "" means "." ---> so paths like "/usr/lib//libc.a" work */
if (!len && (de->di_fname[0] == '.') && (de->di_fname[1] == '\0')) {
return 1;
}
thislen = strlen( de->di_fname );
if ( thislen > namelen )
thislen = namelen;
if (len != thislen) {
return 0;
}
if (strncmp(name, de->di_fname, len) == 0) {
if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) {
return 1;
}
}
return 0;
}
static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
const char *name, struct qnx4_inode_entry **res_dir, int *ino)
{
unsigned long block, offset, blkofs;
struct buffer_head *bh;
*res_dir = NULL;
if (!dir->i_sb) {
printk("qnx4: no superblock on dir.\n");
return NULL;
}
bh = NULL;
block = offset = blkofs = 0;
while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
if (!bh) {
bh = qnx4_bread(dir, blkofs, 0);
if (!bh) {
blkofs++;
continue;
}
}
*res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
if (qnx4_match(len, name, bh, &offset)) {
block = qnx4_block_map( dir, blkofs );
*ino = block * QNX4_INODES_PER_BLOCK +
(offset / QNX4_DIR_ENTRY_SIZE) - 1;
return bh;
}
if (offset < bh->b_size) {
continue;
}
brelse(bh);
bh = NULL;
offset = 0;
blkofs++;
}
brelse(bh);
*res_dir = NULL;
return NULL;
}
struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
int ino;
struct qnx4_inode_entry *de;
struct qnx4_link_info *lnk;
struct buffer_head *bh;
const char *name = dentry->d_name.name;
int len = dentry->d_name.len;
struct inode *foundinode = NULL;
lock_kernel();
if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
goto out;
/* The entry is linked, let's get the real info */
if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
lnk = (struct qnx4_link_info *) de;
ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
QNX4_INODES_PER_BLOCK +
lnk->dl_inode_ndx;
}
brelse(bh);
if ((foundinode = iget(dir->i_sb, ino)) == NULL) {
unlock_kernel();
QNX4DEBUG(("qnx4: lookup->iget -> NULL\n"));
return ERR_PTR(-EACCES);
}
out:
unlock_kernel();
d_add(dentry, foundinode);
return NULL;
}
#ifdef CONFIG_QNX4FS_RW
int qnx4_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
QNX4DEBUG(("qnx4: qnx4_create\n"));
if (dir == NULL) {
return -ENOENT;
}
return -ENOSPC;
}
int qnx4_rmdir(struct inode *dir, struct dentry *dentry)
{
struct buffer_head *bh;
struct qnx4_inode_entry *de;
struct inode *inode;
int retval;
int ino;
QNX4DEBUG(("qnx4: qnx4_rmdir [%s]\n", dentry->d_name.name));
lock_kernel();
bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
&de, &ino);
if (bh == NULL) {
unlock_kernel();
return -ENOENT;
}
inode = dentry->d_inode;
if (inode->i_ino != ino) {
retval = -EIO;
goto end_rmdir;
}
#if 0
if (!empty_dir(inode)) {
retval = -ENOTEMPTY;
goto end_rmdir;
}
#endif
if (inode->i_nlink != 2) {
QNX4DEBUG(("empty directory has nlink!=2 (%d)\n", inode->i_nlink));
}
QNX4DEBUG(("qnx4: deleting directory\n"));
de->di_status = 0;
memset(de->di_fname, 0, sizeof de->di_fname);
de->di_mode = 0;
mark_buffer_dirty(bh);
clear_nlink(inode);
mark_inode_dirty(inode);
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
inode_dec_link_count(dir);
retval = 0;
end_rmdir:
brelse(bh);
unlock_kernel();
return retval;
}
int qnx4_unlink(struct inode *dir, struct dentry *dentry)
{
struct buffer_head *bh;
struct qnx4_inode_entry *de;
struct inode *inode;
int retval;
int ino;
QNX4DEBUG(("qnx4: qnx4_unlink [%s]\n", dentry->d_name.name));
lock_kernel();
bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
&de, &ino);
if (bh == NULL) {
unlock_kernel();
return -ENOENT;
}
inode = dentry->d_inode;
if (inode->i_ino != ino) {
retval = -EIO;
goto end_unlink;
}
retval = -EPERM;
if (!inode->i_nlink) {
QNX4DEBUG(("Deleting nonexistent file (%s:%lu), %d\n",
inode->i_sb->s_id,
inode->i_ino, inode->i_nlink));
inode->i_nlink = 1;
}
de->di_status = 0;
memset(de->di_fname, 0, sizeof de->di_fname);
de->di_mode = 0;
mark_buffer_dirty(bh);
dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
inode->i_ctime = dir->i_ctime;
inode_dec_link_count(inode);
retval = 0;
end_unlink:
unlock_kernel();
brelse(bh);
return retval;
}
#endif
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