2005-04-17 05:20:36 +07:00
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/*
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* QNX4 file system, Linux implementation.
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*
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* Version : 0.2.1
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*
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* Using parts of the xiafs filesystem.
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*
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* History :
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*
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* 01-06-1998 by Richard Frowijn : first release.
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* 21-06-1998 by Frank Denis : dcache support, fixed error codes.
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* 04-07-1998 by Frank Denis : first step for rmdir/unlink.
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*/
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/qnx4_fs.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/errno.h>
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#include <linux/smp_lock.h>
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#include <linux/buffer_head.h>
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/*
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* check if the filename is correct. For some obscure reason, qnx writes a
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* new file twice in the directory entry, first with all possible options at 0
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* and for a second time the way it is, they want us not to access the qnx
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* filesystem when whe are using linux.
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*/
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static int qnx4_match(int len, const char *name,
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struct buffer_head *bh, unsigned long *offset)
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{
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struct qnx4_inode_entry *de;
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int namelen, thislen;
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if (bh == NULL) {
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printk("qnx4: matching unassigned buffer !\n");
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return 0;
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}
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de = (struct qnx4_inode_entry *) (bh->b_data + *offset);
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*offset += QNX4_DIR_ENTRY_SIZE;
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if ((de->di_status & QNX4_FILE_LINK) != 0) {
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namelen = QNX4_NAME_MAX;
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} else {
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namelen = QNX4_SHORT_NAME_MAX;
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}
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/* "" means "." ---> so paths like "/usr/lib//libc.a" work */
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if (!len && (de->di_fname[0] == '.') && (de->di_fname[1] == '\0')) {
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return 1;
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}
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thislen = strlen( de->di_fname );
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if ( thislen > namelen )
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thislen = namelen;
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if (len != thislen) {
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return 0;
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}
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if (strncmp(name, de->di_fname, len) == 0) {
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if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) {
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return 1;
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}
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}
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return 0;
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}
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static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
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const char *name, struct qnx4_inode_entry **res_dir, int *ino)
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{
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unsigned long block, offset, blkofs;
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struct buffer_head *bh;
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*res_dir = NULL;
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if (!dir->i_sb) {
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printk("qnx4: no superblock on dir.\n");
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return NULL;
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}
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bh = NULL;
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block = offset = blkofs = 0;
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while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
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if (!bh) {
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bh = qnx4_bread(dir, blkofs, 0);
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if (!bh) {
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blkofs++;
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continue;
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}
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}
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*res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
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if (qnx4_match(len, name, bh, &offset)) {
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block = qnx4_block_map( dir, blkofs );
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*ino = block * QNX4_INODES_PER_BLOCK +
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(offset / QNX4_DIR_ENTRY_SIZE) - 1;
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return bh;
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}
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if (offset < bh->b_size) {
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continue;
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}
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brelse(bh);
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bh = NULL;
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offset = 0;
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blkofs++;
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}
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brelse(bh);
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*res_dir = NULL;
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return NULL;
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}
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struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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{
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int ino;
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struct qnx4_inode_entry *de;
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struct qnx4_link_info *lnk;
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struct buffer_head *bh;
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const char *name = dentry->d_name.name;
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int len = dentry->d_name.len;
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struct inode *foundinode = NULL;
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lock_kernel();
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if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
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goto out;
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/* The entry is linked, let's get the real info */
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if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
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lnk = (struct qnx4_link_info *) de;
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ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
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QNX4_INODES_PER_BLOCK +
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lnk->dl_inode_ndx;
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}
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brelse(bh);
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2008-02-07 15:15:45 +07:00
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foundinode = qnx4_iget(dir->i_sb, ino);
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if (IS_ERR(foundinode)) {
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2005-04-17 05:20:36 +07:00
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unlock_kernel();
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2008-02-07 15:15:45 +07:00
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QNX4DEBUG(("qnx4: lookup->iget -> error %ld\n",
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PTR_ERR(foundinode)));
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return ERR_CAST(foundinode);
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2005-04-17 05:20:36 +07:00
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}
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out:
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unlock_kernel();
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d_add(dentry, foundinode);
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return NULL;
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}
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#ifdef CONFIG_QNX4FS_RW
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int qnx4_create(struct inode *dir, struct dentry *dentry, int mode,
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struct nameidata *nd)
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{
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QNX4DEBUG(("qnx4: qnx4_create\n"));
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if (dir == NULL) {
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return -ENOENT;
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}
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return -ENOSPC;
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}
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int qnx4_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct buffer_head *bh;
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struct qnx4_inode_entry *de;
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struct inode *inode;
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int retval;
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int ino;
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QNX4DEBUG(("qnx4: qnx4_rmdir [%s]\n", dentry->d_name.name));
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lock_kernel();
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bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
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&de, &ino);
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if (bh == NULL) {
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unlock_kernel();
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return -ENOENT;
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}
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inode = dentry->d_inode;
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if (inode->i_ino != ino) {
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retval = -EIO;
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goto end_rmdir;
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}
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#if 0
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if (!empty_dir(inode)) {
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retval = -ENOTEMPTY;
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goto end_rmdir;
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}
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#endif
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if (inode->i_nlink != 2) {
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QNX4DEBUG(("empty directory has nlink!=2 (%d)\n", inode->i_nlink));
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}
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QNX4DEBUG(("qnx4: deleting directory\n"));
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de->di_status = 0;
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memset(de->di_fname, 0, sizeof de->di_fname);
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de->di_mode = 0;
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mark_buffer_dirty(bh);
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2006-10-01 13:29:06 +07:00
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clear_nlink(inode);
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2005-04-17 05:20:36 +07:00
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mark_inode_dirty(inode);
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inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
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2006-10-01 13:29:03 +07:00
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inode_dec_link_count(dir);
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2005-04-17 05:20:36 +07:00
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retval = 0;
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end_rmdir:
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brelse(bh);
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unlock_kernel();
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return retval;
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}
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int qnx4_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct buffer_head *bh;
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struct qnx4_inode_entry *de;
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struct inode *inode;
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int retval;
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int ino;
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QNX4DEBUG(("qnx4: qnx4_unlink [%s]\n", dentry->d_name.name));
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lock_kernel();
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bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
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&de, &ino);
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if (bh == NULL) {
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unlock_kernel();
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return -ENOENT;
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}
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inode = dentry->d_inode;
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if (inode->i_ino != ino) {
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retval = -EIO;
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goto end_unlink;
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}
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retval = -EPERM;
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if (!inode->i_nlink) {
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QNX4DEBUG(("Deleting nonexistent file (%s:%lu), %d\n",
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inode->i_sb->s_id,
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inode->i_ino, inode->i_nlink));
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inode->i_nlink = 1;
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}
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de->di_status = 0;
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memset(de->di_fname, 0, sizeof de->di_fname);
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de->di_mode = 0;
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mark_buffer_dirty(bh);
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dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
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mark_inode_dirty(dir);
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inode->i_ctime = dir->i_ctime;
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2006-10-01 13:29:03 +07:00
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inode_dec_link_count(inode);
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2005-04-17 05:20:36 +07:00
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retval = 0;
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end_unlink:
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unlock_kernel();
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brelse(bh);
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return retval;
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}
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#endif
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