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-rw-r--r--fs/qnx4/Kconfig14
-rw-r--r--fs/qnx4/Makefile7
-rw-r--r--fs/qnx4/README9
-rw-r--r--fs/qnx4/bitmap.c45
-rw-r--r--fs/qnx4/dir.c117
-rw-r--r--fs/qnx4/inode.c427
-rw-r--r--fs/qnx4/namei.c122
-rw-r--r--fs/qnx4/qnx4.h46
8 files changed, 787 insertions, 0 deletions
diff --git a/fs/qnx4/Kconfig b/fs/qnx4/Kconfig
new file mode 100644
index 000000000..5f6089994
--- /dev/null
+++ b/fs/qnx4/Kconfig
@@ -0,0 +1,14 @@
+config QNX4FS_FS
+ tristate "QNX4 file system support (read only)"
+ depends on BLOCK
+ help
+ This is the file system used by the real-time operating systems
+ QNX 4 and QNX 6 (the latter is also called QNX RTP).
+ Further information is available at <http://www.qnx.com/>.
+ Say Y if you intend to mount QNX hard disks or floppies.
+
+ To compile this file system support as a module, choose M here: the
+ module will be called qnx4.
+
+ If you don't know whether you need it, then you don't need it:
+ answer N.
diff --git a/fs/qnx4/Makefile b/fs/qnx4/Makefile
new file mode 100644
index 000000000..4a283b3f8
--- /dev/null
+++ b/fs/qnx4/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux qnx4-filesystem routines.
+#
+
+obj-$(CONFIG_QNX4FS_FS) += qnx4.o
+
+qnx4-objs := inode.o dir.o namei.o bitmap.o
diff --git a/fs/qnx4/README b/fs/qnx4/README
new file mode 100644
index 000000000..1f1e320d9
--- /dev/null
+++ b/fs/qnx4/README
@@ -0,0 +1,9 @@
+
+ This is a snapshot of the QNX4 filesystem for Linux.
+ Please send diffs and remarks to <al@alarsen.net> .
+
+Credits :
+
+Richard "Scuba" A. Frowijn <scuba@wxs.nl>
+Frank "Jedi/Sector One" Denis <j@pureftpd.org>
+Anders Larsen <al@alarsen.net> (Maintainer)
diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c
new file mode 100644
index 000000000..163afc4ba
--- /dev/null
+++ b/fs/qnx4/bitmap.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 28-05-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : basic optimisations.
+ * 25-06-1998 by Frank Denis : qnx4_is_free, qnx4_set_bitmap, qnx4_bmap .
+ * 28-06-1998 by Frank Denis : qnx4_free_inode (to be fixed) .
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/bitops.h>
+#include "qnx4.h"
+
+unsigned long qnx4_count_free_blocks(struct super_block *sb)
+{
+ int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
+ int total = 0;
+ int total_free = 0;
+ int offset = 0;
+ int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
+ struct buffer_head *bh;
+
+ while (total < size) {
+ int bytes = min(size - total, QNX4_BLOCK_SIZE);
+
+ if ((bh = sb_bread(sb, start + offset)) == NULL) {
+ printk(KERN_ERR "qnx4: I/O error in counting free blocks\n");
+ break;
+ }
+ total_free += bytes * BITS_PER_BYTE -
+ memweight(bh->b_data, bytes);
+ brelse(bh);
+ total += bytes;
+ offset++;
+ }
+
+ return total_free;
+}
diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c
new file mode 100644
index 000000000..66645a5a3
--- /dev/null
+++ b/fs/qnx4/dir.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 28-05-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
+ */
+
+#include <linux/buffer_head.h>
+#include "qnx4.h"
+
+/*
+ * A qnx4 directory entry is an inode entry or link info
+ * depending on the status field in the last byte. The
+ * first byte is where the name start either way, and a
+ * zero means it's empty.
+ *
+ * Also, due to a bug in gcc, we don't want to use the
+ * real (differently sized) name arrays in the inode and
+ * link entries, but always the 'de_name[]' one in the
+ * fake struct entry.
+ *
+ * See
+ *
+ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c6
+ *
+ * for details, but basically gcc will take the size of the
+ * 'name' array from one of the used union entries randomly.
+ *
+ * This use of 'de_name[]' (48 bytes) avoids the false positive
+ * warnings that would happen if gcc decides to use 'inode.di_name'
+ * (16 bytes) even when the pointer and size were to come from
+ * 'link.dl_name' (48 bytes).
+ *
+ * In all cases the actual name pointer itself is the same, it's
+ * only the gcc internal 'what is the size of this field' logic
+ * that can get confused.
+ */
+union qnx4_directory_entry {
+ struct {
+ const char de_name[48];
+ u8 de_pad[15];
+ u8 de_status;
+ };
+ struct qnx4_inode_entry inode;
+ struct qnx4_link_info link;
+};
+
+static int qnx4_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ unsigned int offset;
+ struct buffer_head *bh;
+ unsigned long blknum;
+ int ix, ino;
+ int size;
+
+ QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
+ QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos));
+
+ while (ctx->pos < inode->i_size) {
+ blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
+ bh = sb_bread(inode->i_sb, blknum);
+ if (bh == NULL) {
+ printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
+ return 0;
+ }
+ ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
+ for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
+ union qnx4_directory_entry *de;
+
+ offset = ix * QNX4_DIR_ENTRY_SIZE;
+ de = (union qnx4_directory_entry *) (bh->b_data + offset);
+
+ if (!de->de_name[0])
+ continue;
+ if (!(de->de_status & (QNX4_FILE_USED|QNX4_FILE_LINK)))
+ continue;
+ if (!(de->de_status & QNX4_FILE_LINK)) {
+ size = sizeof(de->inode.di_fname);
+ ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
+ } else {
+ size = sizeof(de->link.dl_fname);
+ ino = ( le32_to_cpu(de->link.dl_inode_blk) - 1 ) *
+ QNX4_INODES_PER_BLOCK +
+ de->link.dl_inode_ndx;
+ }
+ size = strnlen(de->de_name, size);
+ QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, name));
+ if (!dir_emit(ctx, de->de_name, size, ino, DT_UNKNOWN)) {
+ brelse(bh);
+ return 0;
+ }
+ }
+ brelse(bh);
+ }
+ return 0;
+}
+
+const struct file_operations qnx4_dir_operations =
+{
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate_shared = qnx4_readdir,
+ .fsync = generic_file_fsync,
+};
+
+const struct inode_operations qnx4_dir_inode_operations =
+{
+ .lookup = qnx4_lookup,
+};
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
new file mode 100644
index 000000000..3d46fe302
--- /dev/null
+++ b/fs/qnx4/inode.c
@@ -0,0 +1,427 @@
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 01-06-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
+ * 30-06-1998 by Frank Denis : first step to write inodes.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/highuid.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include <linux/writeback.h>
+#include <linux/statfs.h>
+#include "qnx4.h"
+
+#define QNX4_VERSION 4
+#define QNX4_BMNAME ".bitmap"
+
+static const struct super_operations qnx4_sops;
+
+static struct inode *qnx4_alloc_inode(struct super_block *sb);
+static void qnx4_destroy_inode(struct inode *inode);
+static int qnx4_remount(struct super_block *sb, int *flags, char *data);
+static int qnx4_statfs(struct dentry *, struct kstatfs *);
+
+static const struct super_operations qnx4_sops =
+{
+ .alloc_inode = qnx4_alloc_inode,
+ .destroy_inode = qnx4_destroy_inode,
+ .statfs = qnx4_statfs,
+ .remount_fs = qnx4_remount,
+};
+
+static int qnx4_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct qnx4_sb_info *qs;
+
+ sync_filesystem(sb);
+ qs = qnx4_sb(sb);
+ qs->Version = QNX4_VERSION;
+ *flags |= SB_RDONLY;
+ return 0;
+}
+
+static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
+{
+ unsigned long phys;
+
+ QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
+
+ phys = qnx4_block_map( inode, iblock );
+ if ( phys ) {
+ // logical block is before EOF
+ map_bh(bh, inode->i_sb, phys);
+ }
+ return 0;
+}
+
+static inline u32 try_extent(qnx4_xtnt_t *extent, u32 *offset)
+{
+ u32 size = le32_to_cpu(extent->xtnt_size);
+ if (*offset < size)
+ return le32_to_cpu(extent->xtnt_blk) + *offset - 1;
+ *offset -= size;
+ return 0;
+}
+
+unsigned long qnx4_block_map( struct inode *inode, long iblock )
+{
+ int ix;
+ long i_xblk;
+ struct buffer_head *bh = NULL;
+ struct qnx4_xblk *xblk = NULL;
+ struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
+ u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
+ u32 offset = iblock;
+ u32 block = try_extent(&qnx4_inode->di_first_xtnt, &offset);
+
+ if (block) {
+ // iblock is in the first extent. This is easy.
+ } else {
+ // iblock is beyond first extent. We have to follow the extent chain.
+ i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
+ ix = 0;
+ while ( --nxtnt > 0 ) {
+ if ( ix == 0 ) {
+ // read next xtnt block.
+ bh = sb_bread(inode->i_sb, i_xblk - 1);
+ if ( !bh ) {
+ QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
+ return -EIO;
+ }
+ xblk = (struct qnx4_xblk*)bh->b_data;
+ if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
+ QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
+ return -EIO;
+ }
+ }
+ block = try_extent(&xblk->xblk_xtnts[ix], &offset);
+ if (block) {
+ // got it!
+ break;
+ }
+ if ( ++ix >= xblk->xblk_num_xtnts ) {
+ i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
+ ix = 0;
+ brelse( bh );
+ bh = NULL;
+ }
+ }
+ if ( bh )
+ brelse( bh );
+ }
+
+ QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
+ return block;
+}
+
+static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+ buf->f_type = sb->s_magic;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
+ buf->f_bfree = qnx4_count_free_blocks(sb);
+ buf->f_bavail = buf->f_bfree;
+ buf->f_namelen = QNX4_NAME_MAX;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
+
+ return 0;
+}
+
+/*
+ * Check the root directory of the filesystem to make sure
+ * it really _is_ a qnx4 filesystem, and to check the size
+ * of the directory entry.
+ */
+static const char *qnx4_checkroot(struct super_block *sb,
+ struct qnx4_super_block *s)
+{
+ struct buffer_head *bh;
+ struct qnx4_inode_entry *rootdir;
+ int rd, rl;
+ int i, j;
+
+ if (s->RootDir.di_fname[0] != '/' || s->RootDir.di_fname[1] != '\0')
+ return "no qnx4 filesystem (no root dir).";
+ QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
+ rd = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_blk) - 1;
+ rl = le32_to_cpu(s->RootDir.di_first_xtnt.xtnt_size);
+ for (j = 0; j < rl; j++) {
+ bh = sb_bread(sb, rd + j); /* root dir, first block */
+ if (bh == NULL)
+ return "unable to read root entry.";
+ rootdir = (struct qnx4_inode_entry *) bh->b_data;
+ for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
+ QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
+ if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
+ continue;
+ qnx4_sb(sb)->BitMap = kmemdup(rootdir,
+ sizeof(struct qnx4_inode_entry),
+ GFP_KERNEL);
+ brelse(bh);
+ if (!qnx4_sb(sb)->BitMap)
+ return "not enough memory for bitmap inode";
+ /* keep bitmap inode known */
+ return NULL;
+ }
+ brelse(bh);
+ }
+ return "bitmap file not found.";
+}
+
+static int qnx4_fill_super(struct super_block *s, void *data, int silent)
+{
+ struct buffer_head *bh;
+ struct inode *root;
+ const char *errmsg;
+ struct qnx4_sb_info *qs;
+
+ qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
+ if (!qs)
+ return -ENOMEM;
+ s->s_fs_info = qs;
+
+ sb_set_blocksize(s, QNX4_BLOCK_SIZE);
+
+ s->s_op = &qnx4_sops;
+ s->s_magic = QNX4_SUPER_MAGIC;
+ s->s_flags |= SB_RDONLY; /* Yup, read-only yet */
+
+ /* Check the superblock signature. Since the qnx4 code is
+ dangerous, we should leave as quickly as possible
+ if we don't belong here... */
+ bh = sb_bread(s, 1);
+ if (!bh) {
+ printk(KERN_ERR "qnx4: unable to read the superblock\n");
+ return -EINVAL;
+ }
+
+ /* check before allocating dentries, inodes, .. */
+ errmsg = qnx4_checkroot(s, (struct qnx4_super_block *) bh->b_data);
+ brelse(bh);
+ if (errmsg != NULL) {
+ if (!silent)
+ printk(KERN_ERR "qnx4: %s\n", errmsg);
+ return -EINVAL;
+ }
+
+ /* does root not have inode number QNX4_ROOT_INO ?? */
+ root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
+ if (IS_ERR(root)) {
+ printk(KERN_ERR "qnx4: get inode failed\n");
+ return PTR_ERR(root);
+ }
+
+ s->s_root = d_make_root(root);
+ if (s->s_root == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void qnx4_kill_sb(struct super_block *sb)
+{
+ struct qnx4_sb_info *qs = qnx4_sb(sb);
+ kill_block_super(sb);
+ if (qs) {
+ kfree(qs->BitMap);
+ kfree(qs);
+ }
+}
+
+static int qnx4_readpage(struct file *file, struct page *page)
+{
+ return block_read_full_page(page,qnx4_get_block);
+}
+
+static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
+{
+ return generic_block_bmap(mapping,block,qnx4_get_block);
+}
+static const struct address_space_operations qnx4_aops = {
+ .readpage = qnx4_readpage,
+ .bmap = qnx4_bmap
+};
+
+struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
+{
+ struct buffer_head *bh;
+ struct qnx4_inode_entry *raw_inode;
+ int block;
+ struct qnx4_inode_entry *qnx4_inode;
+ struct inode *inode;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ qnx4_inode = qnx4_raw_inode(inode);
+ inode->i_mode = 0;
+
+ QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
+ if (!ino) {
+ printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
+ "out of range\n",
+ sb->s_id, ino);
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
+ }
+ block = ino / QNX4_INODES_PER_BLOCK;
+
+ if (!(bh = sb_bread(sb, block))) {
+ printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
+ "%s\n", sb->s_id);
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
+ }
+ raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
+ (ino % QNX4_INODES_PER_BLOCK);
+
+ inode->i_mode = le16_to_cpu(raw_inode->di_mode);
+ i_uid_write(inode, (uid_t)le16_to_cpu(raw_inode->di_uid));
+ i_gid_write(inode, (gid_t)le16_to_cpu(raw_inode->di_gid));
+ set_nlink(inode, le16_to_cpu(raw_inode->di_nlink));
+ inode->i_size = le32_to_cpu(raw_inode->di_size);
+ inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
+ inode->i_mtime.tv_nsec = 0;
+ inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
+ inode->i_atime.tv_nsec = 0;
+ inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
+ inode->i_ctime.tv_nsec = 0;
+ inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
+
+ memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_fop = &generic_ro_fops;
+ inode->i_mapping->a_ops = &qnx4_aops;
+ qnx4_i(inode)->mmu_private = inode->i_size;
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = &qnx4_dir_inode_operations;
+ inode->i_fop = &qnx4_dir_operations;
+ } else if (S_ISLNK(inode->i_mode)) {
+ inode->i_op = &page_symlink_inode_operations;
+ inode_nohighmem(inode);
+ inode->i_mapping->a_ops = &qnx4_aops;
+ qnx4_i(inode)->mmu_private = inode->i_size;
+ } else {
+ printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
+ ino, sb->s_id);
+ iget_failed(inode);
+ brelse(bh);
+ return ERR_PTR(-EIO);
+ }
+ brelse(bh);
+ unlock_new_inode(inode);
+ return inode;
+}
+
+static struct kmem_cache *qnx4_inode_cachep;
+
+static struct inode *qnx4_alloc_inode(struct super_block *sb)
+{
+ struct qnx4_inode_info *ei;
+ ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void qnx4_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
+}
+
+static void qnx4_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, qnx4_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int init_inodecache(void)
+{
+ qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
+ sizeof(struct qnx4_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ init_once);
+ if (qnx4_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(qnx4_inode_cachep);
+}
+
+static struct dentry *qnx4_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
+}
+
+static struct file_system_type qnx4_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "qnx4",
+ .mount = qnx4_mount,
+ .kill_sb = qnx4_kill_sb,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("qnx4");
+
+static int __init init_qnx4_fs(void)
+{
+ int err;
+
+ err = init_inodecache();
+ if (err)
+ return err;
+
+ err = register_filesystem(&qnx4_fs_type);
+ if (err) {
+ destroy_inodecache();
+ return err;
+ }
+
+ printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
+ return 0;
+}
+
+static void __exit exit_qnx4_fs(void)
+{
+ unregister_filesystem(&qnx4_fs_type);
+ destroy_inodecache();
+}
+
+module_init(init_qnx4_fs)
+module_exit(exit_qnx4_fs)
+MODULE_LICENSE("GPL");
+
diff --git a/fs/qnx4/namei.c b/fs/qnx4/namei.c
new file mode 100644
index 000000000..8d7222173
--- /dev/null
+++ b/fs/qnx4/namei.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 01-06-1998 by Richard Frowijn : first release.
+ * 21-06-1998 by Frank Denis : dcache support, fixed error codes.
+ * 04-07-1998 by Frank Denis : first step for rmdir/unlink.
+ */
+
+#include <linux/buffer_head.h>
+#include "qnx4.h"
+
+
+/*
+ * check if the filename is correct. For some obscure reason, qnx writes a
+ * new file twice in the directory entry, first with all possible options at 0
+ * and for a second time the way it is, they want us not to access the qnx
+ * filesystem when whe are using linux.
+ */
+static int qnx4_match(int len, const char *name,
+ struct buffer_head *bh, unsigned long *offset)
+{
+ struct qnx4_inode_entry *de;
+ int namelen, thislen;
+
+ if (bh == NULL) {
+ printk(KERN_WARNING "qnx4: matching unassigned buffer !\n");
+ return 0;
+ }
+ de = (struct qnx4_inode_entry *) (bh->b_data + *offset);
+ *offset += QNX4_DIR_ENTRY_SIZE;
+ if ((de->di_status & QNX4_FILE_LINK) != 0) {
+ namelen = QNX4_NAME_MAX;
+ } else {
+ namelen = QNX4_SHORT_NAME_MAX;
+ }
+ thislen = strlen( de->di_fname );
+ if ( thislen > namelen )
+ thislen = namelen;
+ if (len != thislen) {
+ return 0;
+ }
+ if (strncmp(name, de->di_fname, len) == 0) {
+ if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
+ const char *name, struct qnx4_inode_entry **res_dir, int *ino)
+{
+ unsigned long block, offset, blkofs;
+ struct buffer_head *bh;
+
+ *res_dir = NULL;
+ bh = NULL;
+ block = offset = blkofs = 0;
+ while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
+ if (!bh) {
+ block = qnx4_block_map(dir, blkofs);
+ if (block)
+ bh = sb_bread(dir->i_sb, block);
+ if (!bh) {
+ blkofs++;
+ continue;
+ }
+ }
+ *res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
+ if (qnx4_match(len, name, bh, &offset)) {
+ *ino = block * QNX4_INODES_PER_BLOCK +
+ (offset / QNX4_DIR_ENTRY_SIZE) - 1;
+ return bh;
+ }
+ if (offset < bh->b_size) {
+ continue;
+ }
+ brelse(bh);
+ bh = NULL;
+ offset = 0;
+ blkofs++;
+ }
+ brelse(bh);
+ *res_dir = NULL;
+ return NULL;
+}
+
+struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+ int ino;
+ struct qnx4_inode_entry *de;
+ struct qnx4_link_info *lnk;
+ struct buffer_head *bh;
+ const char *name = dentry->d_name.name;
+ int len = dentry->d_name.len;
+ struct inode *foundinode = NULL;
+
+ if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
+ goto out;
+ /* The entry is linked, let's get the real info */
+ if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
+ lnk = (struct qnx4_link_info *) de;
+ ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
+ QNX4_INODES_PER_BLOCK +
+ lnk->dl_inode_ndx;
+ }
+ brelse(bh);
+
+ foundinode = qnx4_iget(dir->i_sb, ino);
+ if (IS_ERR(foundinode))
+ QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n",
+ PTR_ERR(foundinode)));
+out:
+ return d_splice_alias(foundinode, dentry);
+}
diff --git a/fs/qnx4/qnx4.h b/fs/qnx4/qnx4.h
new file mode 100644
index 000000000..628370546
--- /dev/null
+++ b/fs/qnx4/qnx4.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+
+#define QNX4_DEBUG 0
+
+#if QNX4_DEBUG
+#define QNX4DEBUG(X) printk X
+#else
+#define QNX4DEBUG(X) (void) 0
+#endif
+
+struct qnx4_sb_info {
+ unsigned int Version; /* may be useful */
+ struct qnx4_inode_entry *BitMap; /* useful */
+};
+
+struct qnx4_inode_info {
+ struct qnx4_inode_entry raw;
+ loff_t mmu_private;
+ struct inode vfs_inode;
+};
+
+extern struct inode *qnx4_iget(struct super_block *, unsigned long);
+extern struct dentry *qnx4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags);
+extern unsigned long qnx4_count_free_blocks(struct super_block *sb);
+extern unsigned long qnx4_block_map(struct inode *inode, long iblock);
+
+extern const struct inode_operations qnx4_dir_inode_operations;
+extern const struct file_operations qnx4_dir_operations;
+extern int qnx4_is_free(struct super_block *sb, long block);
+
+static inline struct qnx4_sb_info *qnx4_sb(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+static inline struct qnx4_inode_info *qnx4_i(struct inode *inode)
+{
+ return container_of(inode, struct qnx4_inode_info, vfs_inode);
+}
+
+static inline struct qnx4_inode_entry *qnx4_raw_inode(struct inode *inode)
+{
+ return &qnx4_i(inode)->raw;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-19 21:16:09 +0000