^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * QNX4 file system, Linux implementation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Version : 0.2.1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Using parts of the xiafs filesystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * History :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * 01-06-1998 by Richard Frowijn : first release.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * 21-06-1998 by Frank Denis : dcache support, fixed error codes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * 04-07-1998 by Frank Denis : first step for rmdir/unlink.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "qnx4.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * check if the filename is correct. For some obscure reason, qnx writes a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * new file twice in the directory entry, first with all possible options at 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * and for a second time the way it is, they want us not to access the qnx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * filesystem when whe are using linux.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int qnx4_match(int len, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct buffer_head *bh, unsigned long *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct qnx4_inode_entry *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int namelen, thislen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (bh == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) printk(KERN_WARNING "qnx4: matching unassigned buffer !\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) de = (struct qnx4_inode_entry *) (bh->b_data + *offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) *offset += QNX4_DIR_ENTRY_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if ((de->di_status & QNX4_FILE_LINK) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) namelen = QNX4_NAME_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) namelen = QNX4_SHORT_NAME_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) thislen = strlen( de->di_fname );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if ( thislen > namelen )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) thislen = namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (len != thislen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (strncmp(name, de->di_fname, len) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) const char *name, struct qnx4_inode_entry **res_dir, int *ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) unsigned long block, offset, blkofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) *res_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) block = offset = blkofs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) block = qnx4_block_map(dir, blkofs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) bh = sb_bread(dir->i_sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) blkofs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) *res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (qnx4_match(len, name, bh, &offset)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) *ino = block * QNX4_INODES_PER_BLOCK +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) (offset / QNX4_DIR_ENTRY_SIZE) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (offset < bh->b_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) blkofs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) *res_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) int ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct qnx4_inode_entry *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct qnx4_link_info *lnk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) const char *name = dentry->d_name.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) int len = dentry->d_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct inode *foundinode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* The entry is linked, let's get the real info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) lnk = (struct qnx4_link_info *) de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) QNX4_INODES_PER_BLOCK +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) lnk->dl_inode_ndx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) foundinode = qnx4_iget(dir->i_sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (IS_ERR(foundinode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) PTR_ERR(foundinode)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return d_splice_alias(foundinode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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