b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100 1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * QNX4 file system, Linux implementation.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * Version : 0.2.1
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) * Using parts of the xiafs filesystem.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * History :
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) * 01-06-1998 by Richard Frowijn : first release.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) * 21-06-1998 by Frank Denis : dcache support, fixed error codes.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) * 04-07-1998 by Frank Denis : first step for rmdir/unlink.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) #include <linux/buffer_head.h>
964f5369667b3 (Al Viro 2009-06-07 09:47:13 -0400 17) #include "qnx4.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 21) * check if the filename is correct. For some obscure reason, qnx writes a
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22) * new file twice in the directory entry, first with all possible options at 0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23) * and for a second time the way it is, they want us not to access the qnx
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) * filesystem when whe are using linux.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 25) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26) static int qnx4_match(int len, const char *name,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) struct buffer_head *bh, unsigned long *offset)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 29) struct qnx4_inode_entry *de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30) int namelen, thislen;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) if (bh == NULL) {
891ddb95d06e9 (Anders Larsen 2009-09-26 20:15:09 +0200 33) printk(KERN_WARNING "qnx4: matching unassigned buffer !\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) de = (struct qnx4_inode_entry *) (bh->b_data + *offset);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 37) *offset += QNX4_DIR_ENTRY_SIZE;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) if ((de->di_status & QNX4_FILE_LINK) != 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) namelen = QNX4_NAME_MAX;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) } else {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) namelen = QNX4_SHORT_NAME_MAX;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43) thislen = strlen( de->di_fname );
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44) if ( thislen > namelen )
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45) thislen = namelen;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46) if (len != thislen) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 49) if (strncmp(name, de->di_fname, len) == 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50) if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 51) return 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 54) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 55) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 56)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57) static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58) const char *name, struct qnx4_inode_entry **res_dir, int *ino)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 59) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) unsigned long block, offset, blkofs;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) struct buffer_head *bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63) *res_dir = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 64) bh = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 65) block = offset = blkofs = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 66) while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 67) if (!bh) {
8f82ecae53347 (Al Viro 2012-02-13 20:57:12 -0500 68) block = qnx4_block_map(dir, blkofs);
8f82ecae53347 (Al Viro 2012-02-13 20:57:12 -0500 69) if (block)
8f82ecae53347 (Al Viro 2012-02-13 20:57:12 -0500 70) bh = sb_bread(dir->i_sb, block);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 71) if (!bh) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 72) blkofs++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 73) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 75) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 76) *res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 77) if (qnx4_match(len, name, bh, &offset)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 78) *ino = block * QNX4_INODES_PER_BLOCK +
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79) (offset / QNX4_DIR_ENTRY_SIZE) - 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) return bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 81) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) if (offset < bh->b_size) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) bh = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) offset = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88) blkofs++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 90) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) *res_dir = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94)
00cd8dd3bf95f (Al Viro 2012-06-10 17:13:09 -0400 95) struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97) int ino;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 98) struct qnx4_inode_entry *de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) struct qnx4_link_info *lnk;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 100) struct buffer_head *bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 101) const char *name = dentry->d_name.name;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) int len = dentry->d_name.len;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 103) struct inode *foundinode = NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105) if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106) goto out;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107) /* The entry is linked, let's get the real info */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108) if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109) lnk = (struct qnx4_link_info *) de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 110) ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 111) QNX4_INODES_PER_BLOCK +
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 112) lnk->dl_inode_ndx;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 114) brelse(bh);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115)
2b7e5bcbd9e03 (David Howells 2008-02-07 00:15:45 -0800 116) foundinode = qnx4_iget(dir->i_sb, ino);
b135dcea37d15 (Al Viro 2018-04-30 20:02:31 -0400 117) if (IS_ERR(foundinode))
891ddb95d06e9 (Anders Larsen 2009-09-26 20:15:09 +0200 118) QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n",
2b7e5bcbd9e03 (David Howells 2008-02-07 00:15:45 -0800 119) PTR_ERR(foundinode)));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 120) out:
b135dcea37d15 (Al Viro 2018-04-30 20:02:31 -0400 121) return d_splice_alias(foundinode, dentry);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 122) }
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