forked from Minki/linux
945ffe54bb
qnx4 wrte support has never been fully implement, is broken since the dawn of time and hasn't been actively developed since before git history started. Instead of letting it further bitrot and complicate API transition (like the new truncate code) remove it. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Anders Larsen <al@alarsen.net> Cc: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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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/smp_lock.h>
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#include <linux/buffer_head.h>
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#include "qnx4.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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foundinode = qnx4_iget(dir->i_sb, ino);
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if (IS_ERR(foundinode)) {
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unlock_kernel();
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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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}
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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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