* The actual compression is based on zlib, see the other files.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/blkdev.h>
-#include <linux/cramfs_fs.h>
#include <linux/slab.h>
-#include <linux/cramfs_fs_sb.h>
#include <linux/vfs.h>
#include <linux/mutex.h>
+#include <uapi/linux/cramfs_fs.h>
+#include <linux/uaccess.h>
+
+#include "internal.h"
-#include <asm/uaccess.h>
+/*
+ * cramfs super-block data in memory
+ */
+struct cramfs_sb_info {
+ unsigned long magic;
+ unsigned long size;
+ unsigned long blocks;
+ unsigned long files;
+ unsigned long flags;
+};
+
+static inline struct cramfs_sb_info *CRAMFS_SB(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
static const struct super_operations cramfs_ops;
static const struct inode_operations cramfs_dir_inode_operations;
static unsigned char read_buffers[READ_BUFFERS][BUFFER_SIZE];
static unsigned buffer_blocknr[READ_BUFFERS];
-static struct super_block * buffer_dev[READ_BUFFERS];
+static struct super_block *buffer_dev[READ_BUFFERS];
static int next_buffer;
/*
struct page *page = NULL;
if (blocknr + i < devsize) {
- page = read_mapping_page_async(mapping, blocknr + i,
- NULL);
+ page = read_mapping_page(mapping, blocknr + i, NULL);
/* synchronous error? */
if (IS_ERR(page))
page = NULL;
for (i = 0; i < BLKS_PER_BUF; i++) {
struct page *page = pages[i];
+
if (page) {
wait_on_page_locked(page);
if (!PageUptodate(page)) {
data = read_buffers[buffer];
for (i = 0; i < BLKS_PER_BUF; i++) {
struct page *page = pages[i];
+
if (page) {
memcpy(data, kmap(page), PAGE_CACHE_SIZE);
kunmap(page);
return read_buffers[buffer] + offset;
}
-static void cramfs_put_super(struct super_block *sb)
+static void cramfs_kill_sb(struct super_block *sb)
{
- kfree(sb->s_fs_info);
- sb->s_fs_info = NULL;
+ struct cramfs_sb_info *sbi = CRAMFS_SB(sb);
+
+ kill_block_super(sb);
+ kfree(sbi);
}
static int cramfs_remount(struct super_block *sb, int *flags, char *data)
/* check for wrong endianness */
if (super.magic == CRAMFS_MAGIC_WEND) {
if (!silent)
- printk(KERN_ERR "cramfs: wrong endianness\n");
- goto out;
+ pr_err("wrong endianness\n");
+ return -EINVAL;
}
/* check at 512 byte offset */
mutex_unlock(&read_mutex);
if (super.magic != CRAMFS_MAGIC) {
if (super.magic == CRAMFS_MAGIC_WEND && !silent)
- printk(KERN_ERR "cramfs: wrong endianness\n");
+ pr_err("wrong endianness\n");
else if (!silent)
- printk(KERN_ERR "cramfs: wrong magic\n");
- goto out;
+ pr_err("wrong magic\n");
+ return -EINVAL;
}
}
/* get feature flags first */
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
- printk(KERN_ERR "cramfs: unsupported filesystem features\n");
- goto out;
+ pr_err("unsupported filesystem features\n");
+ return -EINVAL;
}
/* 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;
+ pr_err("root is not a directory\n");
+ return -EINVAL;
}
/* 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;
+ 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->size = 1<<28;
+ sbi->blocks = 0;
+ sbi->files = 0;
}
- sbi->magic=super.magic;
- sbi->flags=super.flags;
+ sbi->magic = super.magic;
+ sbi->flags = super.flags;
if (root_offset == 0)
- printk(KERN_INFO "cramfs: empty filesystem");
+ pr_info("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;
+ pr_err("bad root offset %lu\n", root_offset);
+ return -EINVAL;
}
/* Set it all up.. */
sb->s_op = &cramfs_ops;
root = get_cramfs_inode(sb, &super.root, 0);
if (IS_ERR(root))
- goto out;
+ return PTR_ERR(root);
sb->s_root = d_make_root(root);
if (!sb->s_root)
- goto out;
+ return -ENOMEM;
return 0;
-out:
- kfree(sbi);
- sb->s_fs_info = NULL;
- return -EINVAL;
}
static int cramfs_statfs(struct dentry *dentry, struct kstatfs *buf)
/*
* Read a cramfs directory entry.
*/
-static int cramfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+static int cramfs_readdir(struct file *file, struct dir_context *ctx)
{
- struct inode *inode = file_inode(filp);
+ struct inode *inode = file_inode(file);
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)
+ if (ctx->pos >= inode->i_size)
return 0;
+ offset = ctx->pos;
/* Directory entries are always 4-byte aligned */
if (offset & 3)
return -EINVAL;
if (!buf)
return -ENOMEM;
- copied = 0;
while (offset < inode->i_size) {
struct cramfs_inode *de;
unsigned long nextoffset;
char *name;
ino_t ino;
umode_t mode;
- int namelen, error;
+ int namelen;
mutex_lock(&read_mutex);
de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+CRAMFS_MAXPATHLEN);
break;
namelen--;
}
- error = filldir(dirent, buf, namelen, offset, ino, mode >> 12);
- if (error)
+ if (!dir_emit(ctx, buf, namelen, ino, mode >> 12))
break;
- offset = nextoffset;
- filp->f_pos = offset;
- copied++;
+ ctx->pos = offset = nextoffset;
}
kfree(buf);
return 0;
/*
* Lookup and fill in the inode data..
*/
-static struct dentry * cramfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+static struct dentry *cramfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
unsigned int offset = 0;
struct inode *inode = NULL;
return NULL;
}
-static int cramfs_readpage(struct file *file, struct page * page)
+static int cramfs_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
u32 maxblock;
if (compr_len == 0)
; /* hole */
else if (unlikely(compr_len > (PAGE_CACHE_SIZE << 1))) {
- pr_err("cramfs: bad compressed blocksize %u\n",
+ pr_err("bad compressed blocksize %u\n",
compr_len);
goto err;
} else {
static const struct file_operations cramfs_directory_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
- .readdir = cramfs_readdir,
+ .iterate = cramfs_readdir,
};
static const struct inode_operations cramfs_dir_inode_operations = {
};
static const struct super_operations cramfs_ops = {
- .put_super = cramfs_put_super,
.remount_fs = cramfs_remount,
.statfs = cramfs_statfs,
};
.owner = THIS_MODULE,
.name = "cramfs",
.mount = cramfs_mount,
- .kill_sb = kill_block_super,
+ .kill_sb = cramfs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("cramfs");
projects / firefly-linux-kernel-4.4.55.git / blobdiff