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| 1 | /* |
| 2 | * QNX4 file system, Linux implementation. |
| 3 | * |
| 4 | * Version : 0.2.1 |
| 5 | * |
| 6 | * Using parts of the xiafs filesystem. |
| 7 | * |
| 8 | * History : |
| 9 | * |
| 10 | * 01-06-1998 by Richard Frowijn : first release. |
| 11 | * 21-06-1998 by Frank Denis : dcache support, fixed error codes. |
| 12 | * 04-07-1998 by Frank Denis : first step for rmdir/unlink. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/buffer_head.h> |
| 16 | #include "qnx4.h" |
| 17 | |
| 18 | |
| 19 | /* |
| 20 | * check if the filename is correct. For some obscure reason, qnx writes a |
| 21 | * new file twice in the directory entry, first with all possible options at 0 |
| 22 | * and for a second time the way it is, they want us not to access the qnx |
| 23 | * filesystem when whe are using linux. |
| 24 | */ |
| 25 | static int qnx4_match(int len, const char *name, |
| 26 | struct buffer_head *bh, unsigned long *offset) |
| 27 | { |
| 28 | struct qnx4_inode_entry *de; |
| 29 | int namelen, thislen; |
| 30 | |
| 31 | if (bh == NULL) { |
| 32 | printk(KERN_WARNING "qnx4: matching unassigned buffer !\n"); |
| 33 | return 0; |
| 34 | } |
| 35 | de = (struct qnx4_inode_entry *) (bh->b_data + *offset); |
| 36 | *offset += QNX4_DIR_ENTRY_SIZE; |
| 37 | if ((de->di_status & QNX4_FILE_LINK) != 0) { |
| 38 | namelen = QNX4_NAME_MAX; |
| 39 | } else { |
| 40 | namelen = QNX4_SHORT_NAME_MAX; |
| 41 | } |
| 42 | /* "" means "." ---> so paths like "/usr/lib//libc.a" work */ |
| 43 | if (!len && (de->di_fname[0] == '.') && (de->di_fname[1] == '\0')) { |
| 44 | return 1; |
| 45 | } |
| 46 | thislen = strlen( de->di_fname ); |
| 47 | if ( thislen > namelen ) |
| 48 | thislen = namelen; |
| 49 | if (len != thislen) { |
| 50 | return 0; |
| 51 | } |
| 52 | if (strncmp(name, de->di_fname, len) == 0) { |
| 53 | if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) { |
| 54 | return 1; |
| 55 | } |
| 56 | } |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static struct buffer_head *qnx4_find_entry(int len, struct inode *dir, |
| 61 | const char *name, struct qnx4_inode_entry **res_dir, int *ino) |
| 62 | { |
| 63 | unsigned long block, offset, blkofs; |
| 64 | struct buffer_head *bh; |
| 65 | |
| 66 | *res_dir = NULL; |
| 67 | if (!dir->i_sb) { |
| 68 | printk(KERN_WARNING "qnx4: no superblock on dir.\n"); |
| 69 | return NULL; |
| 70 | } |
| 71 | bh = NULL; |
| 72 | block = offset = blkofs = 0; |
| 73 | while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) { |
| 74 | if (!bh) { |
| 75 | bh = qnx4_bread(dir, blkofs, 0); |
| 76 | if (!bh) { |
| 77 | blkofs++; |
| 78 | continue; |
| 79 | } |
| 80 | } |
| 81 | *res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset); |
| 82 | if (qnx4_match(len, name, bh, &offset)) { |
| 83 | block = qnx4_block_map( dir, blkofs ); |
| 84 | *ino = block * QNX4_INODES_PER_BLOCK + |
| 85 | (offset / QNX4_DIR_ENTRY_SIZE) - 1; |
| 86 | return bh; |
| 87 | } |
| 88 | if (offset < bh->b_size) { |
| 89 | continue; |
| 90 | } |
| 91 | brelse(bh); |
| 92 | bh = NULL; |
| 93 | offset = 0; |
| 94 | blkofs++; |
| 95 | } |
| 96 | brelse(bh); |
| 97 | *res_dir = NULL; |
| 98 | return NULL; |
| 99 | } |
| 100 | |
| 101 | struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| 102 | { |
| 103 | int ino; |
| 104 | struct qnx4_inode_entry *de; |
| 105 | struct qnx4_link_info *lnk; |
| 106 | struct buffer_head *bh; |
| 107 | const char *name = dentry->d_name.name; |
| 108 | int len = dentry->d_name.len; |
| 109 | struct inode *foundinode = NULL; |
| 110 | |
| 111 | if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino))) |
| 112 | goto out; |
| 113 | /* The entry is linked, let's get the real info */ |
| 114 | if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) { |
| 115 | lnk = (struct qnx4_link_info *) de; |
| 116 | ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) * |
| 117 | QNX4_INODES_PER_BLOCK + |
| 118 | lnk->dl_inode_ndx; |
| 119 | } |
| 120 | brelse(bh); |
| 121 | |
| 122 | foundinode = qnx4_iget(dir->i_sb, ino); |
| 123 | if (IS_ERR(foundinode)) { |
| 124 | QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n", |
| 125 | PTR_ERR(foundinode))); |
| 126 | return ERR_CAST(foundinode); |
| 127 | } |
| 128 | out: |
| 129 | d_add(dentry, foundinode); |
| 130 | |
| 131 | return NULL; |
| 132 | } |
| 133 |
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