#include <linux/cramfs_fs_sb.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
#include <asm/uaccess.h>
-static struct super_operations cramfs_ops;
-static struct inode_operations cramfs_dir_inode_operations;
-static struct file_operations cramfs_directory_operations;
-static struct address_space_operations cramfs_aops;
+static const struct super_operations cramfs_ops;
+static const struct inode_operations cramfs_dir_inode_operations;
+static const struct file_operations cramfs_directory_operations;
+static const struct address_space_operations cramfs_aops;
-static DECLARE_MUTEX(read_mutex);
+static DEFINE_MUTEX(read_mutex);
/* These two macros may change in future, to provide better st_ino
semantics. */
-#define CRAMINO(x) ((x)->offset?(x)->offset<<2:1)
+#define CRAMINO(x) (((x)->offset && (x)->size)?(x)->offset<<2:1)
#define OFFSET(x) ((x)->i_ino)
static int cramfs_iget5_test(struct inode *inode, void *opaque)
{
struct cramfs_inode *cramfs_inode = opaque;
-
- if (inode->i_ino != CRAMINO(cramfs_inode))
- return 0; /* does not match */
-
- if (inode->i_ino != 1)
- return 1;
-
- /* all empty directories, char, block, pipe, and sock, share inode #1 */
-
- if ((inode->i_mode != cramfs_inode->mode) ||
- (inode->i_gid != cramfs_inode->gid) ||
- (inode->i_uid != cramfs_inode->uid))
- return 0; /* does not match */
-
- if ((S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) &&
- (inode->i_rdev != old_decode_dev(cramfs_inode->size)))
- return 0; /* does not match */
-
- return 1; /* matches */
+ return inode->i_ino == CRAMINO(cramfs_inode) && inode->i_ino != 1;
}
static int cramfs_iget5_set(struct inode *inode, void *opaque)
inode->i_uid = cramfs_inode->uid;
inode->i_size = cramfs_inode->size;
inode->i_blocks = (cramfs_inode->size - 1) / 512 + 1;
- inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_gid = cramfs_inode->gid;
/* Struct copy intentional */
inode->i_mtime = inode->i_atime = inode->i_ctime = zerotime;
- inode->i_ino = CRAMINO(cramfs_inode);
/* inode->i_nlink is left 1 - arguably wrong for directories,
but it's the best we can do without reading the directory
- contents. 1 yields the right result in GNU find, even
+ contents. 1 yields the right result in GNU find, even
without -noleaf option. */
if (S_ISREG(inode->i_mode)) {
inode->i_fop = &generic_ro_fops;
inode->i_op = &page_symlink_inode_operations;
inode->i_data.a_ops = &cramfs_aops;
} else {
- inode->i_size = 0;
- inode->i_blocks = 0;
init_special_inode(inode, inode->i_mode,
old_decode_dev(cramfs_inode->size));
}
return inode;
}
+static void cramfs_drop_inode(struct inode *inode)
+{
+ if (inode->i_ino == 1)
+ generic_delete_inode(inode);
+ else
+ generic_drop_inode(inode);
+}
+
/*
* We have our own block cache: don't fill up the buffer cache
* with the rom-image, because the way the filesystem is set
{
struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
struct page *pages[BLKS_PER_BUF];
- unsigned i, blocknr, buffer, unread;
+ unsigned i, blocknr, buffer;
unsigned long devsize;
char *data;
devsize = mapping->host->i_size >> PAGE_CACHE_SHIFT;
/* Ok, read in BLKS_PER_BUF pages completely first. */
- unread = 0;
for (i = 0; i < BLKS_PER_BUF; i++) {
struct page *page = NULL;
if (blocknr + i < devsize) {
- page = read_cache_page(mapping, blocknr + i,
- (filler_t *)mapping->a_ops->readpage,
- NULL);
+ page = read_mapping_page_async(mapping, blocknr + i,
+ NULL);
/* synchronous error? */
if (IS_ERR(page))
page = NULL;
sb->s_flags |= MS_RDONLY;
- sbi = kmalloc(sizeof(struct cramfs_sb_info), GFP_KERNEL);
+ sbi = kzalloc(sizeof(struct cramfs_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
- memset(sbi, 0, sizeof(struct cramfs_sb_info));
/* Invalidate the read buffers on mount: think disk change.. */
- down(&read_mutex);
+ 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));
- up(&read_mutex);
+ 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 */
- down(&read_mutex);
+ mutex_lock(&read_mutex);
memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
if (super.magic != CRAMFS_MAGIC) {
- if (!silent)
+ 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;
}
return -EINVAL;
}
-static int cramfs_statfs(struct super_block *sb, struct kstatfs *buf)
+static int cramfs_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 = CRAMFS_MAGIC;
buf->f_bsize = PAGE_CACHE_SIZE;
buf->f_blocks = CRAMFS_SB(sb)->blocks;
buf->f_bavail = 0;
buf->f_files = CRAMFS_SB(sb)->files;
buf->f_ffree = 0;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
buf->f_namelen = CRAMFS_MAXPATHLEN;
return 0;
}
*/
static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
- struct inode *inode = filp->f_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
char *buf;
unsigned int offset;
if (offset & 3)
return -EINVAL;
- buf = kmalloc(256, GFP_KERNEL);
+ buf = kmalloc(CRAMFS_MAXPATHLEN, GFP_KERNEL);
if (!buf)
return -ENOMEM;
mode_t mode;
int namelen, error;
- down(&read_mutex);
- de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+256);
+ mutex_lock(&read_mutex);
+ de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+CRAMFS_MAXPATHLEN);
name = (char *)(de+1);
/*
memcpy(buf, name, namelen);
ino = CRAMINO(de);
mode = de->mode;
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
nextoffset = offset + sizeof(*de) + namelen;
for (;;) {
if (!namelen) {
unsigned int offset = 0;
int sorted;
- down(&read_mutex);
+ 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;
- de = cramfs_read(dir->i_sb, OFFSET(dir) + offset, sizeof(*de)+256);
+ de = cramfs_read(dir->i_sb, OFFSET(dir) + offset, sizeof(*de)+CRAMFS_MAXPATHLEN);
name = (char *)(de+1);
/* Try to take advantage of sorted directories */
for (;;) {
if (!namelen) {
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
return ERR_PTR(-EIO);
}
if (name[namelen-1])
continue;
if (!retval) {
struct cramfs_inode entry = *de;
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
d_add(dentry, get_cramfs_inode(dir->i_sb, &entry));
return NULL;
}
if (sorted)
break;
}
- up(&read_mutex);
+ mutex_unlock(&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;
+ 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;
- down(&read_mutex);
+ 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);
- up(&read_mutex);
- pgdata = kmap(page);
+ 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 {
- down(&read_mutex);
+ 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);
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
+ if (unlikely(bytes_filled < 0))
+ goto err;
}
- } else
- pgdata = kmap(page);
+ }
+
memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled);
- kunmap(page);
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 struct address_space_operations cramfs_aops = {
+static const struct address_space_operations cramfs_aops = {
.readpage = cramfs_readpage
};
/*
* A directory can only readdir
*/
-static struct file_operations cramfs_directory_operations = {
+static const struct file_operations cramfs_directory_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = cramfs_readdir,
};
-static struct inode_operations cramfs_dir_inode_operations = {
+static const struct inode_operations cramfs_dir_inode_operations = {
.lookup = cramfs_lookup,
};
-static struct super_operations cramfs_ops = {
+static const struct super_operations cramfs_ops = {
.put_super = cramfs_put_super,
.remount_fs = cramfs_remount,
.statfs = cramfs_statfs,
+ .drop_inode = cramfs_drop_inode,
};
-static struct super_block *cramfs_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int cramfs_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
- return get_sb_bdev(fs_type, flags, dev_name, data, cramfs_fill_super);
+ return get_sb_bdev(fs_type, flags, dev_name, data, cramfs_fill_super,
+ mnt);
}
static struct file_system_type cramfs_fs_type = {
static int __init init_cramfs_fs(void)
{
- cramfs_uncompress_init();
- return register_filesystem(&cramfs_fs_type);
+ int rv;
+
+ rv = cramfs_uncompress_init();
+ if (rv < 0)
+ return rv;
+ rv = register_filesystem(&cramfs_fs_type);
+ if (rv < 0)
+ cramfs_uncompress_exit();
+ return rv;
}
static void __exit exit_cramfs_fs(void)
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff