int qnx4_is_free(struct super_block *sb, long block)
{
int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
struct buffer_head *bh;
const char *g;
int ret = -EIO;
start += block / (QNX4_BLOCK_SIZE * 8);
QNX4DEBUG(("qnx4: is_free requesting block [%lu], bitmap in block [%lu]\n",
(unsigned long) block, (unsigned long) start));
(void) size; /* CHECKME */
bh = sb_bread(sb, start);
if (bh == NULL) {
return -EIO;
}
g = bh->b_data + (block % QNX4_BLOCK_SIZE);
if (((*g) & (1 << (block % 8))) == 0) {
QNX4DEBUG(("qnx4: is_free -> block is free\n"));
ret = 1;
} else {
QNX4DEBUG(("qnx4: is_free -> block is busy\n"));
ret = 0;
}
brelse(bh);
return ret;
}
int qnx4_set_bitmap(struct super_block *sb, long block, int busy)
{
int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
struct buffer_head *bh;
char *g;
start += block / (QNX4_BLOCK_SIZE * 8);
QNX4DEBUG(("qnx4: set_bitmap requesting block [%lu], bitmap in block [%lu]\n",
(unsigned long) block, (unsigned long) start));
(void) size; /* CHECKME */
bh = sb_bread(sb, start);
if (bh == NULL) {
return -EIO;
}
g = bh->b_data + (block % QNX4_BLOCK_SIZE);
if (busy == 0) {
(*g) &= ~(1 << (block % 8));
} else {
(*g) |= (1 << (block % 8));
}
mark_buffer_dirty(bh);
brelse(bh);
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 buffer_head *bh;
struct qnx4_inode_entry *rootdir;
int rd, rl;
int i, j;
if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/')
return "no qnx4 filesystem (no root dir).";
QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
rl = le32_to_cpu(qnx4_sb(sb)->sb->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 void qnx4_put_super(struct super_block *sb)
{
struct qnx4_sb_info *qs = qnx4_sb(sb);
kfree( qs->BitMap );
kfree( qs );
sb->s_fs_info = NULL;
return;
}
static int qnx4_remount(struct super_block *sb, int *flags, char *data)
{
struct qnx4_sb_info *qs;
qs = qnx4_sb(sb);
qs->Version = QNX4_VERSION;
*flags |= MS_RDONLY;
return 0;
}
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) {
if ((bh = sb_bread(sb, start + offset)) == NULL) {
printk("qnx4: I/O error in counting free blocks\n");
break;
}
count_bits(bh->b_data, size - total, &total_free);
brelse(bh);
total += QNX4_BLOCK_SIZE;
offset++;
}
return total_free;
}
static int qnx4_statfs(struct super_block *sb, struct kstatfs *buf)
{
lock_kernel();
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;
unlock_kernel();
return 0;
}
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;
}
static int qnx4_remount(struct super_block *sb, int *flags, char *data)
{
struct qnx4_sb_info *qs;
qs = qnx4_sb(sb);
qs->Version = QNX4_VERSION;
#ifndef CONFIG_QNX4FS_RW
*flags |= MS_RDONLY;
#endif
if (*flags & MS_RDONLY) {
return 0;
}
mark_buffer_dirty(qs->sb_buf);
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 buffer_head *bh;
struct qnx4_inode_entry *rootdir;
int rd, rl;
int i, j;
int found = 0;
if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
return "no qnx4 filesystem (no root dir).";
} else {
QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
rl = le32_to_cpu(qnx4_sb(sb)->sb->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.";
}
for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
if (rootdir->di_fname != NULL) {
QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
found = 1;
qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
if (!qnx4_sb(sb)->BitMap) {
brelse (bh);
return "not enough memory for bitmap inode";
}
memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
break;
}
}
}
brelse(bh);
if (found != 0) {
break;
}
}
if (found == 0) {
return "bitmap file not found.";
}
}
return NULL;
}
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;
int ret = -EINVAL;
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);
/* 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");
goto outnobh;
}
if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
if (!silent)
printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
goto out;
}
s->s_op = &qnx4_sops;
s->s_magic = QNX4_SUPER_MAGIC;
s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
qnx4_sb(s)->sb_buf = bh;
qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
/* check before allocating dentries, inodes, .. */
errmsg = qnx4_checkroot(s);
if (errmsg != NULL) {
if (!silent)
printk(KERN_ERR "qnx4: %s\n", errmsg);
goto out;
}
/* 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");
ret = PTR_ERR(root);
goto out;
}
ret = -ENOMEM;
s->s_root = d_alloc_root(root);
if (s->s_root == NULL)
goto outi;
brelse(bh);
return 0;
outi:
iput(root);
out:
brelse(bh);
outnobh:
kfree(qs);
s->s_fs_info = NULL;
return ret;
}
