static int cramfs_readpage(struct file *file, struct page * page)
{
struct inode *inode = page->mapping->host;
u32 maxblock, bytes_filled;
maxblock = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
bytes_filled = 0;
if (page->index < maxblock) {
struct super_block *sb = inode->i_sb;
u32 blkptr_offset = OFFSET(inode) + page->index*4;
u32 start_offset, compr_len;
start_offset = OFFSET(inode) + maxblock*4;
if (page->index)
start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, 4);
compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4)
- start_offset);
if (compr_len == 0)
; /* hole */
else
bytes_filled = cramfs_uncompress_block(page_address(page),
PAGE_CACHE_SIZE,
cramfs_read(sb, start_offset, compr_len),
compr_len);
}
memset(page_address(page) + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled);
flush_dcache_page(page);
SetPageUptodate(page);
UnlockPage(page);
return 0;
}
static int cramfs_readpage(struct file *file, struct page * page)
{
struct inode *inode = page->mapping->host;
u32 maxblock;
int bytes_filled;
void *pgdata;
maxblock = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
bytes_filled = 0;
pgdata = kmap(page);
if (page->index < maxblock) {
struct super_block *sb = inode->i_sb;
u32 blkptr_offset = OFFSET(inode) + page->index*4;
u32 start_offset, compr_len;
start_offset = OFFSET(inode) + maxblock*4;
mutex_lock(&read_mutex);
if (page->index)
start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4,
4);
compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) -
start_offset);
mutex_unlock(&read_mutex);
if (compr_len == 0)
; /* hole */
else if (unlikely(compr_len > (PAGE_CACHE_SIZE << 1))) {
pr_err("cramfs: bad compressed blocksize %u\n",
compr_len);
goto err;
} else {
mutex_lock(&read_mutex);
bytes_filled = cramfs_uncompress_block(pgdata,
PAGE_CACHE_SIZE,
cramfs_read(sb, start_offset, compr_len),
compr_len);
mutex_unlock(&read_mutex);
if (unlikely(bytes_filled < 0))
goto err;
}
}
memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled);
flush_dcache_page(page);
kunmap(page);
SetPageUptodate(page);
unlock_page(page);
return 0;
err:
kunmap(page);
ClearPageUptodate(page);
SetPageError(page);
unlock_page(page);
return 0;
}
static int cramfs_readpage(struct file *file, struct page * page)
{
struct inode *inode = page->mapping->host;
u32 maxblock, bytes_filled;
void *pgdata;
maxblock = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
bytes_filled = 0;
#ifdef CONFIG_CRAMFS_LINEAR_XIP
if (page->index < maxblock && CRAMFS_INODE_IS_XIP(inode)) {
struct super_block *sb = inode->i_sb;
u32 blkptr_offset = PAGE_ALIGN(OFFSET(inode)) +
page->index * PAGE_CACHE_SIZE;
memcpy( page_address(page),
(void*)(sb->CRAMFS_SB_LINEAR_VIRT_ADDR + blkptr_offset),
PAGE_CACHE_SIZE );
bytes_filled = PAGE_CACHE_SIZE;
pgdata = kmap(page);
} else
#endif
if (page->index < maxblock) {
struct super_block *sb = inode->i_sb;
u32 blkptr_offset = OFFSET(inode) + page->index*4;
u32 start_offset, compr_len;
start_offset = OFFSET(inode) + maxblock*4;
down(&read_mutex);
if (page->index)
start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, 4);
compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) - start_offset);
up(&read_mutex);
pgdata = kmap(page);
if (compr_len == 0)
; /* hole */
else {
down(&read_mutex);
bytes_filled = cramfs_uncompress_block(pgdata,
PAGE_CACHE_SIZE,
cramfs_read(sb, start_offset, compr_len),
compr_len);
up(&read_mutex);
}
} else
pgdata = kmap(page);
memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled);
kunmap(page);
flush_dcache_page(page);
SetPageUptodate(page);
UnlockPage(page);
return 0;
}
/*
* Lookup and fill in the inode data..
*/
static struct dentry * cramfs_lookup(struct inode *dir, struct dentry *dentry)
{
unsigned int offset = 0;
while (offset < dir->i_size) {
struct cramfs_inode *de;
char *name;
int namelen;
de = cramfs_read(dir->i_sb, OFFSET(dir) + offset, sizeof(*de)+256);
name = (char *)(de+1);
namelen = de->namelen << 2;
offset += sizeof(*de) + namelen;
/* Quick check that the name is roughly the right length */
if (((dentry->d_name.len + 3) & ~3) != namelen)
continue;
for (;;) {
if (!namelen)
return ERR_PTR(-EIO);
if (name[namelen-1])
break;
namelen--;
}
if (namelen != dentry->d_name.len)
continue;
if (memcmp(dentry->d_name.name, name, namelen))
continue;
d_add(dentry, get_cramfs_inode(dir->i_sb, de));
return NULL;
}
d_add(dentry, NULL);
return NULL;
}
/*
* Lookup and fill in the inode data..
*/
static struct dentry * cramfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
unsigned int offset = 0;
struct inode *inode = NULL;
int sorted;
mutex_lock(&read_mutex);
sorted = CRAMFS_SB(dir->i_sb)->flags & CRAMFS_FLAG_SORTED_DIRS;
while (offset < dir->i_size) {
struct cramfs_inode *de;
char *name;
int namelen, retval;
int dir_off = OFFSET(dir) + offset;
de = cramfs_read(dir->i_sb, dir_off, sizeof(*de)+CRAMFS_MAXPATHLEN);
name = (char *)(de+1);
/* Try to take advantage of sorted directories */
if (sorted && (dentry->d_name.name[0] < name[0]))
break;
namelen = de->namelen << 2;
offset += sizeof(*de) + namelen;
/* Quick check that the name is roughly the right length */
if (((dentry->d_name.len + 3) & ~3) != namelen)
continue;
for (;;) {
if (!namelen) {
inode = ERR_PTR(-EIO);
goto out;
}
if (name[namelen-1])
break;
namelen--;
}
if (namelen != dentry->d_name.len)
continue;
retval = memcmp(dentry->d_name.name, name, namelen);
if (retval > 0)
continue;
if (!retval) {
inode = get_cramfs_inode(dir->i_sb, de, dir_off);
break;
}
/* else (retval < 0) */
if (sorted)
break;
}
out:
mutex_unlock(&read_mutex);
if (IS_ERR(inode))
return ERR_CAST(inode);
d_add(dentry, inode);
return NULL;
}
/*
* Lookup and fill in the inode data..
*/
static struct dentry * cramfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
unsigned int offset = 0;
int sorted;
down(&read_mutex);
sorted = CRAMFS_SB(dir->i_sb)->flags & CRAMFS_FLAG_SORTED_DIRS;
while (offset < dir->i_size) {
struct cramfs_inode *de;
char *name;
int namelen, retval;
de = cramfs_read(dir->i_sb, OFFSET(dir) + offset, sizeof(*de)+256);
name = (char *)(de+1);
/* Try to take advantage of sorted directories */
if (sorted && (dentry->d_name.name[0] < name[0]))
break;
namelen = de->namelen << 2;
offset += sizeof(*de) + namelen;
/* Quick check that the name is roughly the right length */
if (((dentry->d_name.len + 3) & ~3) != namelen)
continue;
for (;;) {
if (!namelen) {
up(&read_mutex);
return ERR_PTR(-EIO);
}
if (name[namelen-1])
break;
namelen--;
}
if (namelen != dentry->d_name.len)
continue;
retval = memcmp(dentry->d_name.name, name, namelen);
if (retval > 0)
continue;
if (!retval) {
struct cramfs_inode entry = *de;
up(&read_mutex);
d_add(dentry, get_cramfs_inode(dir->i_sb, &entry));
return NULL;
}
/* else (retval < 0) */
if (sorted)
break;
}
up(&read_mutex);
d_add(dentry, NULL);
return NULL;
}
static int cramfs_readpage(struct file *file, struct page * page)
{
struct inode *inode = page->mapping->host;
u32 maxblock, bytes_filled;
void *pgdata;
maxblock = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
bytes_filled = 0;
if (page->index < maxblock) {
struct super_block *sb = inode->i_sb;
u32 blkptr_offset = OFFSET(inode) + page->index*4;
u32 start_offset, compr_len;
start_offset = OFFSET(inode) + maxblock*4;
down(&read_mutex);
if (page->index)
start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, 4);
compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) - start_offset);
up(&read_mutex);
pgdata = kmap(page);
if (compr_len == 0)
; /* hole */
else if (compr_len > (PAGE_CACHE_SIZE << 1))
printk(KERN_ERR "cramfs: bad compressed blocksize %u\n", compr_len);
else {
down(&read_mutex);
bytes_filled = cramfs_uncompress_block(pgdata,
PAGE_CACHE_SIZE,
cramfs_read(sb, start_offset, compr_len),
compr_len);
up(&read_mutex);
}
} else
pgdata = kmap(page);
memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled);
kunmap(page);
flush_dcache_page(page);
SetPageUptodate(page);
UnlockPage(page);
return 0;
}
static struct super_block * cramfs_read_super(struct super_block *sb, void *data, int silent)
{
int i;
struct cramfs_super super;
unsigned long root_offset;
struct super_block * retval = NULL;
set_blocksize(sb->s_dev, PAGE_CACHE_SIZE);
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
/* Invalidate the read buffers on mount: think disk change.. */
for (i = 0; i < READ_BUFFERS; i++)
buffer_blocknr[i] = -1;
/* Read the first block and get the superblock from it */
memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super));
/* Do sanity checks on the superblock */
if (super.magic != CRAMFS_MAGIC) {
printk("wrong magic\n");
goto out;
}
if (memcmp(super.signature, CRAMFS_SIGNATURE, sizeof(super.signature))) {
printk("wrong signature\n");
goto out;
}
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
printk("unsupported filesystem features\n");
goto out;
}
/* Check that the root inode is in a sane state */
if (!S_ISDIR(super.root.mode)) {
printk("root is not a directory\n");
goto out;
}
root_offset = super.root.offset << 2;
if (root_offset == 0)
printk(KERN_INFO "cramfs: note: empty filesystem");
else if (root_offset != sizeof(struct cramfs_super)) {
printk("bad root offset %lu\n", root_offset);
goto out;
}
/* Set it all up.. */
sb->s_op = &cramfs_ops;
sb->s_root = d_alloc_root(get_cramfs_inode(sb, &super.root));
retval = sb;
out:
return retval;
}
/*
* Read a cramfs directory entry.
*/
static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_dentry->d_inode;
struct super_block *sb = inode->i_sb;
unsigned int offset;
int copied;
/* Offset within the thing. */
offset = filp->f_pos;
if (offset >= inode->i_size)
return 0;
/* Directory entries are always 4-byte aligned */
if (offset & 3)
return -EINVAL;
copied = 0;
while (offset < inode->i_size) {
struct cramfs_inode *de;
unsigned long nextoffset;
char *name;
int namelen, error;
down(&read_mutex);
de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+256);
up(&read_mutex);
name = (char *)(de+1);
/*
* Namelengths on disk are shifted by two
* and the name padded out to 4-byte boundaries
* with zeroes.
*/
namelen = de->namelen << 2;
nextoffset = offset + sizeof(*de) + namelen;
for (;;) {
if (!namelen)
return -EIO;
if (name[namelen-1])
break;
namelen--;
}
error = filldir(dirent, name, namelen, offset, CRAMINO(de), de->mode >> 12);
if (error)
break;
offset = nextoffset;
filp->f_pos = offset;
copied++;
}
return 0;
}
static struct super_block * cramfs_read_super(struct super_block *sb, void *data, int silent)
{
#ifndef CONFIG_CRAMFS_LINEAR
int i;
#else
char *p;
#endif
struct cramfs_super super;
unsigned long root_offset;
struct super_block * retval = NULL;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
#ifndef CONFIG_CRAMFS_LINEAR
set_blocksize(sb->s_dev, PAGE_CACHE_SIZE);
/* Invalidate the read buffers on mount: think disk change.. */
for (i = 0; i < READ_BUFFERS; i++)
buffer_blocknr[i] = -1;
#else
/*
* The physical location of the cramfs image is specified as
* a mount parameter. This parameter is mandatory for obvious
* reasons. Some validation is made on the phys address but this
* is not exhaustive and we count on the fact that someone using
* this feature is supposed to know what he/she's doing.
*/
if (!data || !(p = strstr((char *)data, "physaddr="))) {
printk(KERN_ERR "cramfs: unknown physical address for linear cramfs image\n");
goto out;
}
sb->CRAMFS_SB_LINEAR_PHYS_ADDR = simple_strtoul(p + 9, NULL, 0);
if (sb->CRAMFS_SB_LINEAR_PHYS_ADDR & (PAGE_SIZE-1)) {
printk(KERN_ERR "cramfs: physical address 0x%lx for linear cramfs isn't aligned to a page boundary\n",
sb->CRAMFS_SB_LINEAR_PHYS_ADDR);
goto out;
}
if (sb->CRAMFS_SB_LINEAR_PHYS_ADDR == 0) {
printk(KERN_ERR "cramfs: physical address for linear cramfs image can't be 0\n");
goto out;
}
printk(KERN_INFO "cramfs: checking physical address 0x%lx for linear cramfs image\n",
sb->CRAMFS_SB_LINEAR_PHYS_ADDR);
/* Map only one page for now. Will remap it when fs size is known. */
sb->CRAMFS_SB_LINEAR_VIRT_ADDR =
ioremap(sb->CRAMFS_SB_LINEAR_PHYS_ADDR, PAGE_SIZE);
if (!sb->CRAMFS_SB_LINEAR_VIRT_ADDR) {
printk(KERN_ERR "cramfs: ioremap of the linear cramfs image failed\n");
goto out;
}
#endif
down(&read_mutex);
/* Read the first block and get the superblock from it */
memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super));
up(&read_mutex);
/* Do sanity checks on the superblock */
if (super.magic != CRAMFS_MAGIC) {
/* check at 512 byte offset */
memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
if (super.magic != CRAMFS_MAGIC) {
printk(KERN_ERR "cramfs: wrong magic\n");
goto out;
}
}
/* get feature flags first */
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
printk(KERN_ERR "cramfs: unsupported filesystem features\n");
goto out;
}
/* Check that the root inode is in a sane state */
if (!S_ISDIR(super.root.mode)) {
printk(KERN_ERR "cramfs: root is not a directory\n");
goto out;
}
root_offset = super.root.offset << 2;
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
sb->CRAMFS_SB_SIZE=super.size;
sb->CRAMFS_SB_BLOCKS=super.fsid.blocks;
sb->CRAMFS_SB_FILES=super.fsid.files;
} else {
sb->CRAMFS_SB_SIZE=1<<28;
sb->CRAMFS_SB_BLOCKS=0;
sb->CRAMFS_SB_FILES=0;
}
sb->CRAMFS_SB_MAGIC=super.magic;
sb->CRAMFS_SB_FLAGS=super.flags;
if (root_offset == 0)
printk(KERN_INFO "cramfs: empty filesystem");
else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
((root_offset != sizeof(struct cramfs_super)) &&
(root_offset != 512 + sizeof(struct cramfs_super))))
{
printk(KERN_ERR "cramfs: bad root offset %lu\n", root_offset);
goto out;
}
/* Set it all up.. */
sb->s_op = &cramfs_ops;
sb->s_root = d_alloc_root(get_cramfs_inode(sb, &super.root));
#ifdef CONFIG_CRAMFS_LINEAR
/* Remap the whole filesystem now */
iounmap(sb->CRAMFS_SB_LINEAR_VIRT_ADDR);
printk(KERN_INFO "cramfs: linear cramfs image appears to be %lu KB in size\n",
sb->CRAMFS_SB_SIZE/1024);
sb->CRAMFS_SB_LINEAR_VIRT_ADDR =
ioremap(sb->CRAMFS_SB_LINEAR_PHYS_ADDR, sb->CRAMFS_SB_SIZE);
if (!sb->CRAMFS_SB_LINEAR_VIRT_ADDR) {
printk(KERN_ERR "cramfs: ioremap of the linear cramfs image failed\n");
goto out;
}
#endif
retval = sb;
out:
#ifdef CONFIG_CRAMFS_LINEAR
if (!retval && sb->CRAMFS_SB_LINEAR_VIRT_ADDR)
iounmap(sb->CRAMFS_SB_LINEAR_VIRT_ADDR);
#endif
return retval;
}
/*
* Read a cramfs directory entry.
*/
static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
char *buf;
unsigned int offset;
int copied;
/* Offset within the thing. */
offset = filp->f_pos;
if (offset >= inode->i_size)
return 0;
/* Directory entries are always 4-byte aligned */
if (offset & 3)
return -EINVAL;
buf = kmalloc(CRAMFS_MAXPATHLEN, GFP_KERNEL);
if (!buf)
return -ENOMEM;
copied = 0;
while (offset < inode->i_size) {
struct cramfs_inode *de;
unsigned long nextoffset;
char *name;
ino_t ino;
mode_t mode;
int namelen, error;
mutex_lock(&read_mutex);
de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+CRAMFS_MAXPATHLEN);
name = (char *)(de+1);
/*
* Namelengths on disk are shifted by two
* and the name padded out to 4-byte boundaries
* with zeroes.
*/
namelen = de->namelen << 2;
memcpy(buf, name, namelen);
ino = cramino(de, OFFSET(inode) + offset);
mode = de->mode;
mutex_unlock(&read_mutex);
nextoffset = offset + sizeof(*de) + namelen;
for (;;) {
if (!namelen) {
kfree(buf);
return -EIO;
}
if (buf[namelen-1])
break;
namelen--;
}
error = filldir(dirent, buf, namelen, offset, ino, mode >> 12);
if (error)
break;
offset = nextoffset;
filp->f_pos = offset;
copied++;
}
kfree(buf);
return 0;
}
static int cramfs_fill_super(struct super_block *sb, void *data, int silent)
{
int i;
struct cramfs_super super;
unsigned long root_offset;
struct cramfs_sb_info *sbi;
struct inode *root;
sb->s_flags |= MS_RDONLY;
sbi = kzalloc(sizeof(struct cramfs_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
/* Invalidate the read buffers on mount: think disk change.. */
mutex_lock(&read_mutex);
for (i = 0; i < READ_BUFFERS; i++)
buffer_blocknr[i] = -1;
/* Read the first block and get the superblock from it */
memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super));
mutex_unlock(&read_mutex);
/* Do sanity checks on the superblock */
if (super.magic != CRAMFS_MAGIC) {
/* check for wrong endianess */
if (super.magic == CRAMFS_MAGIC_WEND) {
if (!silent)
printk(KERN_ERR "cramfs: wrong endianess\n");
goto out;
}
/* check at 512 byte offset */
mutex_lock(&read_mutex);
memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
mutex_unlock(&read_mutex);
if (super.magic != CRAMFS_MAGIC) {
if (super.magic == CRAMFS_MAGIC_WEND && !silent)
printk(KERN_ERR "cramfs: wrong endianess\n");
else if (!silent)
printk(KERN_ERR "cramfs: wrong magic\n");
goto out;
}
}
/* get feature flags first */
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
printk(KERN_ERR "cramfs: unsupported filesystem features\n");
goto out;
}
/* Check that the root inode is in a sane state */
if (!S_ISDIR(super.root.mode)) {
printk(KERN_ERR "cramfs: root is not a directory\n");
goto out;
}
/* correct strange, hard-coded permissions of mkcramfs */
super.root.mode |= (S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
root_offset = super.root.offset << 2;
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
sbi->size=super.size;
sbi->blocks=super.fsid.blocks;
sbi->files=super.fsid.files;
} else {
sbi->size=1<<28;
sbi->blocks=0;
sbi->files=0;
}
sbi->magic=super.magic;
sbi->flags=super.flags;
if (root_offset == 0)
printk(KERN_INFO "cramfs: empty filesystem");
else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
((root_offset != sizeof(struct cramfs_super)) &&
(root_offset != 512 + sizeof(struct cramfs_super))))
{
printk(KERN_ERR "cramfs: bad root offset %lu\n", root_offset);
goto out;
}
/* Set it all up.. */
sb->s_op = &cramfs_ops;
root = get_cramfs_inode(sb, &super.root, 0);
if (IS_ERR(root))
goto out;
sb->s_root = d_alloc_root(root);
if (!sb->s_root) {
iput(root);
goto out;
}
return 0;
out:
kfree(sbi);
sb->s_fs_info = NULL;
return -EINVAL;
}
static struct super_block * cramfs_read_super(struct super_block *sb, void *data, int silent)
{
int i;
struct cramfs_super super;
unsigned long root_offset;
struct super_block * retval = NULL;
/* Invalidate the read buffers on mount: think disk change.. */
for (i = 0; i < READ_BUFFERS; i++)
buffer_blocknr[i] = -1;
down(&read_mutex);
/* Read the first block and get the superblock from it */
memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super));
up(&read_mutex);
/* Do sanity checks on the superblock */
if (super.magic != CRAMFS_MAGIC) {
/* check at 512 byte offset */
memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
if (super.magic != CRAMFS_MAGIC) {
printk(KERN_ERR "cramfs: wrong magic\n");
goto out;
}
}
/* get feature flags first */
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
printk(KERN_ERR "cramfs: unsupported filesystem features\n");
goto out;
}
/* Check that the root inode is in a sane state */
if (!S_ISDIR(super.root.mode)) {
printk(KERN_ERR "cramfs: root is not a directory\n");
goto out;
}
root_offset = super.root.offset << 2;
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
sb->CRAMFS_SB_SIZE=super.size;
sb->CRAMFS_SB_BLOCKS=super.fsid.blocks;
sb->CRAMFS_SB_FILES=super.fsid.files;
} else {
sb->CRAMFS_SB_SIZE=1<<28;
sb->CRAMFS_SB_BLOCKS=0;
sb->CRAMFS_SB_FILES=0;
}
sb->CRAMFS_SB_MAGIC=super.magic;
sb->CRAMFS_SB_FLAGS=super.flags;
if (root_offset == 0)
printk(KERN_INFO "cramfs: empty filesystem");
else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
((root_offset != sizeof(struct cramfs_super)) &&
(root_offset != 512 + sizeof(struct cramfs_super))))
{
printk(KERN_ERR "cramfs: bad root offset %lu\n", root_offset);
goto out;
}
/* Set it all up.. */
sb->s_op = &cramfs_ops;
sb->s_root = d_alloc_root(get_cramfs_inode(sb, &super.root));
retval = sb;
out:
return retval;
}
