// SPDX-License-Identifier: GPL-2.0-only
|
/*
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* QNX6 file system, Linux implementation.
|
*
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* Version : 1.0.0
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*
|
* History :
|
*
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* 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
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* 16-02-2012 pagemap extension by Al Viro
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/highuid.h>
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#include <linux/pagemap.h>
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#include <linux/buffer_head.h>
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#include <linux/writeback.h>
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#include <linux/statfs.h>
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#include <linux/parser.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/crc32.h>
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#include <linux/mpage.h>
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#include "qnx6.h"
|
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static const struct super_operations qnx6_sops;
|
|
static void qnx6_put_super(struct super_block *sb);
|
static struct inode *qnx6_alloc_inode(struct super_block *sb);
|
static void qnx6_free_inode(struct inode *inode);
|
static int qnx6_remount(struct super_block *sb, int *flags, char *data);
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static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf);
|
static int qnx6_show_options(struct seq_file *seq, struct dentry *root);
|
|
static const struct super_operations qnx6_sops = {
|
.alloc_inode = qnx6_alloc_inode,
|
.free_inode = qnx6_free_inode,
|
.put_super = qnx6_put_super,
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.statfs = qnx6_statfs,
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.remount_fs = qnx6_remount,
|
.show_options = qnx6_show_options,
|
};
|
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static int qnx6_show_options(struct seq_file *seq, struct dentry *root)
|
{
|
struct super_block *sb = root->d_sb;
|
struct qnx6_sb_info *sbi = QNX6_SB(sb);
|
|
if (sbi->s_mount_opt & QNX6_MOUNT_MMI_FS)
|
seq_puts(seq, ",mmi_fs");
|
return 0;
|
}
|
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static int qnx6_remount(struct super_block *sb, int *flags, char *data)
|
{
|
sync_filesystem(sb);
|
*flags |= SB_RDONLY;
|
return 0;
|
}
|
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static unsigned qnx6_get_devblock(struct super_block *sb, __fs32 block)
|
{
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struct qnx6_sb_info *sbi = QNX6_SB(sb);
|
return fs32_to_cpu(sbi, block) + sbi->s_blks_off;
|
}
|
|
static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);
|
|
static int qnx6_get_block(struct inode *inode, sector_t iblock,
|
struct buffer_head *bh, int create)
|
{
|
unsigned phys;
|
|
pr_debug("qnx6_get_block inode=[%ld] iblock=[%ld]\n",
|
inode->i_ino, (unsigned long)iblock);
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phys = qnx6_block_map(inode, iblock);
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if (phys) {
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/* logical block is before EOF */
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map_bh(bh, inode->i_sb, phys);
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}
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return 0;
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}
|
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static int qnx6_check_blockptr(__fs32 ptr)
|
{
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if (ptr == ~(__fs32)0) {
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pr_err("hit unused blockpointer.\n");
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return 0;
|
}
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return 1;
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}
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static int qnx6_readpage(struct file *file, struct page *page)
|
{
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return mpage_readpage(page, qnx6_get_block);
|
}
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static void qnx6_readahead(struct readahead_control *rac)
|
{
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mpage_readahead(rac, qnx6_get_block);
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}
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/*
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* returns the block number for the no-th element in the tree
|
* inodebits requred as there are multiple inodes in one inode block
|
*/
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static unsigned qnx6_block_map(struct inode *inode, unsigned no)
|
{
|
struct super_block *s = inode->i_sb;
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struct qnx6_sb_info *sbi = QNX6_SB(s);
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struct qnx6_inode_info *ei = QNX6_I(inode);
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unsigned block = 0;
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struct buffer_head *bh;
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__fs32 ptr;
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int levelptr;
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int ptrbits = sbi->s_ptrbits;
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int bitdelta;
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u32 mask = (1 << ptrbits) - 1;
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int depth = ei->di_filelevels;
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int i;
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bitdelta = ptrbits * depth;
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levelptr = no >> bitdelta;
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if (levelptr > QNX6_NO_DIRECT_POINTERS - 1) {
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pr_err("Requested file block number (%u) too big.", no);
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return 0;
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}
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block = qnx6_get_devblock(s, ei->di_block_ptr[levelptr]);
|
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for (i = 0; i < depth; i++) {
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bh = sb_bread(s, block);
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if (!bh) {
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pr_err("Error reading block (%u)\n", block);
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return 0;
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}
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bitdelta -= ptrbits;
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levelptr = (no >> bitdelta) & mask;
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ptr = ((__fs32 *)bh->b_data)[levelptr];
|
|
if (!qnx6_check_blockptr(ptr))
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return 0;
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block = qnx6_get_devblock(s, ptr);
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brelse(bh);
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}
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return block;
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}
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static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf)
|
{
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struct super_block *sb = dentry->d_sb;
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struct qnx6_sb_info *sbi = QNX6_SB(sb);
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
buf->f_type = sb->s_magic;
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buf->f_bsize = sb->s_blocksize;
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buf->f_blocks = fs32_to_cpu(sbi, sbi->sb->sb_num_blocks);
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buf->f_bfree = fs32_to_cpu(sbi, sbi->sb->sb_free_blocks);
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buf->f_files = fs32_to_cpu(sbi, sbi->sb->sb_num_inodes);
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buf->f_ffree = fs32_to_cpu(sbi, sbi->sb->sb_free_inodes);
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buf->f_bavail = buf->f_bfree;
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buf->f_namelen = QNX6_LONG_NAME_MAX;
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buf->f_fsid = u64_to_fsid(id);
|
|
return 0;
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}
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/*
|
* Check the root directory of the filesystem to make sure
|
* it really _is_ a qnx6 filesystem, and to check the size
|
* of the directory entry.
|
*/
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static const char *qnx6_checkroot(struct super_block *s)
|
{
|
static char match_root[2][3] = {".\0\0", "..\0"};
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int i, error = 0;
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struct qnx6_dir_entry *dir_entry;
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struct inode *root = d_inode(s->s_root);
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struct address_space *mapping = root->i_mapping;
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struct page *page = read_mapping_page(mapping, 0, NULL);
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if (IS_ERR(page))
|
return "error reading root directory";
|
kmap(page);
|
dir_entry = page_address(page);
|
for (i = 0; i < 2; i++) {
|
/* maximum 3 bytes - due to match_root limitation */
|
if (strncmp(dir_entry[i].de_fname, match_root[i], 3))
|
error = 1;
|
}
|
qnx6_put_page(page);
|
if (error)
|
return "error reading root directory.";
|
return NULL;
|
}
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#ifdef CONFIG_QNX6FS_DEBUG
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void qnx6_superblock_debug(struct qnx6_super_block *sb, struct super_block *s)
|
{
|
struct qnx6_sb_info *sbi = QNX6_SB(s);
|
|
pr_debug("magic: %08x\n", fs32_to_cpu(sbi, sb->sb_magic));
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pr_debug("checksum: %08x\n", fs32_to_cpu(sbi, sb->sb_checksum));
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pr_debug("serial: %llx\n", fs64_to_cpu(sbi, sb->sb_serial));
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pr_debug("flags: %08x\n", fs32_to_cpu(sbi, sb->sb_flags));
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pr_debug("blocksize: %08x\n", fs32_to_cpu(sbi, sb->sb_blocksize));
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pr_debug("num_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_num_inodes));
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pr_debug("free_inodes: %08x\n", fs32_to_cpu(sbi, sb->sb_free_inodes));
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pr_debug("num_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_num_blocks));
|
pr_debug("free_blocks: %08x\n", fs32_to_cpu(sbi, sb->sb_free_blocks));
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pr_debug("inode_levels: %02x\n", sb->Inode.levels);
|
}
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#endif
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enum {
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Opt_mmifs,
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Opt_err
|
};
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|
static const match_table_t tokens = {
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{Opt_mmifs, "mmi_fs"},
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{Opt_err, NULL}
|
};
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static int qnx6_parse_options(char *options, struct super_block *sb)
|
{
|
char *p;
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struct qnx6_sb_info *sbi = QNX6_SB(sb);
|
substring_t args[MAX_OPT_ARGS];
|
|
if (!options)
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return 1;
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|
while ((p = strsep(&options, ",")) != NULL) {
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int token;
|
if (!*p)
|
continue;
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|
token = match_token(p, tokens, args);
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switch (token) {
|
case Opt_mmifs:
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set_opt(sbi->s_mount_opt, MMI_FS);
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break;
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default:
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return 0;
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}
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}
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return 1;
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}
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static struct buffer_head *qnx6_check_first_superblock(struct super_block *s,
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int offset, int silent)
|
{
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struct qnx6_sb_info *sbi = QNX6_SB(s);
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struct buffer_head *bh;
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struct qnx6_super_block *sb;
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/* Check the superblock signatures
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start with the first superblock */
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bh = sb_bread(s, offset);
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if (!bh) {
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pr_err("unable to read the first superblock\n");
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return NULL;
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}
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sb = (struct qnx6_super_block *)bh->b_data;
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if (fs32_to_cpu(sbi, sb->sb_magic) != QNX6_SUPER_MAGIC) {
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sbi->s_bytesex = BYTESEX_BE;
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if (fs32_to_cpu(sbi, sb->sb_magic) == QNX6_SUPER_MAGIC) {
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/* we got a big endian fs */
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pr_debug("fs got different endianness.\n");
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return bh;
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} else
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sbi->s_bytesex = BYTESEX_LE;
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if (!silent) {
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if (offset == 0) {
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pr_err("wrong signature (magic) in superblock #1.\n");
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} else {
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pr_info("wrong signature (magic) at position (0x%lx) - will try alternative position (0x0000).\n",
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offset * s->s_blocksize);
|
}
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}
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brelse(bh);
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return NULL;
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}
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return bh;
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}
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static struct inode *qnx6_private_inode(struct super_block *s,
|
struct qnx6_root_node *p);
|
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static int qnx6_fill_super(struct super_block *s, void *data, int silent)
|
{
|
struct buffer_head *bh1 = NULL, *bh2 = NULL;
|
struct qnx6_super_block *sb1 = NULL, *sb2 = NULL;
|
struct qnx6_sb_info *sbi;
|
struct inode *root;
|
const char *errmsg;
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struct qnx6_sb_info *qs;
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int ret = -EINVAL;
|
u64 offset;
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int bootblock_offset = QNX6_BOOTBLOCK_SIZE;
|
|
qs = kzalloc(sizeof(struct qnx6_sb_info), GFP_KERNEL);
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if (!qs)
|
return -ENOMEM;
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s->s_fs_info = qs;
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/* Superblock always is 512 Byte long */
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if (!sb_set_blocksize(s, QNX6_SUPERBLOCK_SIZE)) {
|
pr_err("unable to set blocksize\n");
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goto outnobh;
|
}
|
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/* parse the mount-options */
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if (!qnx6_parse_options((char *) data, s)) {
|
pr_err("invalid mount options.\n");
|
goto outnobh;
|
}
|
if (test_opt(s, MMI_FS)) {
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sb1 = qnx6_mmi_fill_super(s, silent);
|
if (sb1)
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goto mmi_success;
|
else
|
goto outnobh;
|
}
|
sbi = QNX6_SB(s);
|
sbi->s_bytesex = BYTESEX_LE;
|
/* Check the superblock signatures
|
start with the first superblock */
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bh1 = qnx6_check_first_superblock(s,
|
bootblock_offset / QNX6_SUPERBLOCK_SIZE, silent);
|
if (!bh1) {
|
/* try again without bootblock offset */
|
bh1 = qnx6_check_first_superblock(s, 0, silent);
|
if (!bh1) {
|
pr_err("unable to read the first superblock\n");
|
goto outnobh;
|
}
|
/* seems that no bootblock at partition start */
|
bootblock_offset = 0;
|
}
|
sb1 = (struct qnx6_super_block *)bh1->b_data;
|
|
#ifdef CONFIG_QNX6FS_DEBUG
|
qnx6_superblock_debug(sb1, s);
|
#endif
|
|
/* checksum check - start at byte 8 and end at byte 512 */
|
if (fs32_to_cpu(sbi, sb1->sb_checksum) !=
|
crc32_be(0, (char *)(bh1->b_data + 8), 504)) {
|
pr_err("superblock #1 checksum error\n");
|
goto out;
|
}
|
|
/* set new blocksize */
|
if (!sb_set_blocksize(s, fs32_to_cpu(sbi, sb1->sb_blocksize))) {
|
pr_err("unable to set blocksize\n");
|
goto out;
|
}
|
/* blocksize invalidates bh - pull it back in */
|
brelse(bh1);
|
bh1 = sb_bread(s, bootblock_offset >> s->s_blocksize_bits);
|
if (!bh1)
|
goto outnobh;
|
sb1 = (struct qnx6_super_block *)bh1->b_data;
|
|
/* calculate second superblock blocknumber */
|
offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) +
|
(bootblock_offset >> s->s_blocksize_bits) +
|
(QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
|
|
/* set bootblock offset */
|
sbi->s_blks_off = (bootblock_offset >> s->s_blocksize_bits) +
|
(QNX6_SUPERBLOCK_AREA >> s->s_blocksize_bits);
|
|
/* next the second superblock */
|
bh2 = sb_bread(s, offset);
|
if (!bh2) {
|
pr_err("unable to read the second superblock\n");
|
goto out;
|
}
|
sb2 = (struct qnx6_super_block *)bh2->b_data;
|
if (fs32_to_cpu(sbi, sb2->sb_magic) != QNX6_SUPER_MAGIC) {
|
if (!silent)
|
pr_err("wrong signature (magic) in superblock #2.\n");
|
goto out;
|
}
|
|
/* checksum check - start at byte 8 and end at byte 512 */
|
if (fs32_to_cpu(sbi, sb2->sb_checksum) !=
|
crc32_be(0, (char *)(bh2->b_data + 8), 504)) {
|
pr_err("superblock #2 checksum error\n");
|
goto out;
|
}
|
|
if (fs64_to_cpu(sbi, sb1->sb_serial) >=
|
fs64_to_cpu(sbi, sb2->sb_serial)) {
|
/* superblock #1 active */
|
sbi->sb_buf = bh1;
|
sbi->sb = (struct qnx6_super_block *)bh1->b_data;
|
brelse(bh2);
|
pr_info("superblock #1 active\n");
|
} else {
|
/* superblock #2 active */
|
sbi->sb_buf = bh2;
|
sbi->sb = (struct qnx6_super_block *)bh2->b_data;
|
brelse(bh1);
|
pr_info("superblock #2 active\n");
|
}
|
mmi_success:
|
/* sanity check - limit maximum indirect pointer levels */
|
if (sb1->Inode.levels > QNX6_PTR_MAX_LEVELS) {
|
pr_err("too many inode levels (max %i, sb %i)\n",
|
QNX6_PTR_MAX_LEVELS, sb1->Inode.levels);
|
goto out;
|
}
|
if (sb1->Longfile.levels > QNX6_PTR_MAX_LEVELS) {
|
pr_err("too many longfilename levels (max %i, sb %i)\n",
|
QNX6_PTR_MAX_LEVELS, sb1->Longfile.levels);
|
goto out;
|
}
|
s->s_op = &qnx6_sops;
|
s->s_magic = QNX6_SUPER_MAGIC;
|
s->s_flags |= SB_RDONLY; /* Yup, read-only yet */
|
s->s_time_min = 0;
|
s->s_time_max = U32_MAX;
|
|
/* ease the later tree level calculations */
|
sbi = QNX6_SB(s);
|
sbi->s_ptrbits = ilog2(s->s_blocksize / 4);
|
sbi->inodes = qnx6_private_inode(s, &sb1->Inode);
|
if (!sbi->inodes)
|
goto out;
|
sbi->longfile = qnx6_private_inode(s, &sb1->Longfile);
|
if (!sbi->longfile)
|
goto out1;
|
|
/* prefetch root inode */
|
root = qnx6_iget(s, QNX6_ROOT_INO);
|
if (IS_ERR(root)) {
|
pr_err("get inode failed\n");
|
ret = PTR_ERR(root);
|
goto out2;
|
}
|
|
ret = -ENOMEM;
|
s->s_root = d_make_root(root);
|
if (!s->s_root)
|
goto out2;
|
|
ret = -EINVAL;
|
errmsg = qnx6_checkroot(s);
|
if (errmsg != NULL) {
|
if (!silent)
|
pr_err("%s\n", errmsg);
|
goto out3;
|
}
|
return 0;
|
|
out3:
|
dput(s->s_root);
|
s->s_root = NULL;
|
out2:
|
iput(sbi->longfile);
|
out1:
|
iput(sbi->inodes);
|
out:
|
if (bh1)
|
brelse(bh1);
|
if (bh2)
|
brelse(bh2);
|
outnobh:
|
kfree(qs);
|
s->s_fs_info = NULL;
|
return ret;
|
}
|
|
static void qnx6_put_super(struct super_block *sb)
|
{
|
struct qnx6_sb_info *qs = QNX6_SB(sb);
|
brelse(qs->sb_buf);
|
iput(qs->longfile);
|
iput(qs->inodes);
|
kfree(qs);
|
sb->s_fs_info = NULL;
|
return;
|
}
|
|
static sector_t qnx6_bmap(struct address_space *mapping, sector_t block)
|
{
|
return generic_block_bmap(mapping, block, qnx6_get_block);
|
}
|
static const struct address_space_operations qnx6_aops = {
|
.readpage = qnx6_readpage,
|
.readahead = qnx6_readahead,
|
.bmap = qnx6_bmap
|
};
|
|
static struct inode *qnx6_private_inode(struct super_block *s,
|
struct qnx6_root_node *p)
|
{
|
struct inode *inode = new_inode(s);
|
if (inode) {
|
struct qnx6_inode_info *ei = QNX6_I(inode);
|
struct qnx6_sb_info *sbi = QNX6_SB(s);
|
inode->i_size = fs64_to_cpu(sbi, p->size);
|
memcpy(ei->di_block_ptr, p->ptr, sizeof(p->ptr));
|
ei->di_filelevels = p->levels;
|
inode->i_mode = S_IFREG | S_IRUSR; /* probably wrong */
|
inode->i_mapping->a_ops = &qnx6_aops;
|
}
|
return inode;
|
}
|
|
struct inode *qnx6_iget(struct super_block *sb, unsigned ino)
|
{
|
struct qnx6_sb_info *sbi = QNX6_SB(sb);
|
struct qnx6_inode_entry *raw_inode;
|
struct inode *inode;
|
struct qnx6_inode_info *ei;
|
struct address_space *mapping;
|
struct page *page;
|
u32 n, offs;
|
|
inode = iget_locked(sb, ino);
|
if (!inode)
|
return ERR_PTR(-ENOMEM);
|
if (!(inode->i_state & I_NEW))
|
return inode;
|
|
ei = QNX6_I(inode);
|
|
inode->i_mode = 0;
|
|
if (ino == 0) {
|
pr_err("bad inode number on dev %s: %u is out of range\n",
|
sb->s_id, ino);
|
iget_failed(inode);
|
return ERR_PTR(-EIO);
|
}
|
n = (ino - 1) >> (PAGE_SHIFT - QNX6_INODE_SIZE_BITS);
|
offs = (ino - 1) & (~PAGE_MASK >> QNX6_INODE_SIZE_BITS);
|
mapping = sbi->inodes->i_mapping;
|
page = read_mapping_page(mapping, n, NULL);
|
if (IS_ERR(page)) {
|
pr_err("major problem: unable to read inode from dev %s\n",
|
sb->s_id);
|
iget_failed(inode);
|
return ERR_CAST(page);
|
}
|
kmap(page);
|
raw_inode = ((struct qnx6_inode_entry *)page_address(page)) + offs;
|
|
inode->i_mode = fs16_to_cpu(sbi, raw_inode->di_mode);
|
i_uid_write(inode, (uid_t)fs32_to_cpu(sbi, raw_inode->di_uid));
|
i_gid_write(inode, (gid_t)fs32_to_cpu(sbi, raw_inode->di_gid));
|
inode->i_size = fs64_to_cpu(sbi, raw_inode->di_size);
|
inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_mtime);
|
inode->i_mtime.tv_nsec = 0;
|
inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_atime);
|
inode->i_atime.tv_nsec = 0;
|
inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->di_ctime);
|
inode->i_ctime.tv_nsec = 0;
|
|
/* calc blocks based on 512 byte blocksize */
|
inode->i_blocks = (inode->i_size + 511) >> 9;
|
|
memcpy(&ei->di_block_ptr, &raw_inode->di_block_ptr,
|
sizeof(raw_inode->di_block_ptr));
|
ei->di_filelevels = raw_inode->di_filelevels;
|
|
if (S_ISREG(inode->i_mode)) {
|
inode->i_fop = &generic_ro_fops;
|
inode->i_mapping->a_ops = &qnx6_aops;
|
} else if (S_ISDIR(inode->i_mode)) {
|
inode->i_op = &qnx6_dir_inode_operations;
|
inode->i_fop = &qnx6_dir_operations;
|
inode->i_mapping->a_ops = &qnx6_aops;
|
} else if (S_ISLNK(inode->i_mode)) {
|
inode->i_op = &page_symlink_inode_operations;
|
inode_nohighmem(inode);
|
inode->i_mapping->a_ops = &qnx6_aops;
|
} else
|
init_special_inode(inode, inode->i_mode, 0);
|
qnx6_put_page(page);
|
unlock_new_inode(inode);
|
return inode;
|
}
|
|
static struct kmem_cache *qnx6_inode_cachep;
|
|
static struct inode *qnx6_alloc_inode(struct super_block *sb)
|
{
|
struct qnx6_inode_info *ei;
|
ei = kmem_cache_alloc(qnx6_inode_cachep, GFP_KERNEL);
|
if (!ei)
|
return NULL;
|
return &ei->vfs_inode;
|
}
|
|
static void qnx6_free_inode(struct inode *inode)
|
{
|
kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
|
}
|
|
static void init_once(void *foo)
|
{
|
struct qnx6_inode_info *ei = (struct qnx6_inode_info *) foo;
|
|
inode_init_once(&ei->vfs_inode);
|
}
|
|
static int init_inodecache(void)
|
{
|
qnx6_inode_cachep = kmem_cache_create("qnx6_inode_cache",
|
sizeof(struct qnx6_inode_info),
|
0, (SLAB_RECLAIM_ACCOUNT|
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
|
init_once);
|
if (!qnx6_inode_cachep)
|
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(qnx6_inode_cachep);
|
}
|
|
static struct dentry *qnx6_mount(struct file_system_type *fs_type,
|
int flags, const char *dev_name, void *data)
|
{
|
return mount_bdev(fs_type, flags, dev_name, data, qnx6_fill_super);
|
}
|
|
static struct file_system_type qnx6_fs_type = {
|
.owner = THIS_MODULE,
|
.name = "qnx6",
|
.mount = qnx6_mount,
|
.kill_sb = kill_block_super,
|
.fs_flags = FS_REQUIRES_DEV,
|
};
|
MODULE_ALIAS_FS("qnx6");
|
|
static int __init init_qnx6_fs(void)
|
{
|
int err;
|
|
err = init_inodecache();
|
if (err)
|
return err;
|
|
err = register_filesystem(&qnx6_fs_type);
|
if (err) {
|
destroy_inodecache();
|
return err;
|
}
|
|
pr_info("QNX6 filesystem 1.0.0 registered.\n");
|
return 0;
|
}
|
|
static void __exit exit_qnx6_fs(void)
|
{
|
unregister_filesystem(&qnx6_fs_type);
|
destroy_inodecache();
|
}
|
|
module_init(init_qnx6_fs)
|
module_exit(exit_qnx6_fs)
|
MODULE_LICENSE("GPL");
|
MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
|
