From: Phillip Lougher <phillip.lougher@gmail.com>
Subject: squashfs v3.4
Patch-mainline: Never, upstream only supports SquashFS 4.0
References: bnc#666893, FATE#311173
This patch contains version 3.4 of the SquashFS file system.
Acked-by: Greg Kroah-Hartman <gregkh@suse.com>
Acked-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Jeff Mahoney <jeffm@suse.com>
---
fs/Kconfig | 1
fs/Makefile | 1
fs/squashfs3/Kconfig | 49
fs/squashfs3/Makefile | 7
fs/squashfs3/inode.c | 2163 +++++++++++++++++++++++++++++++++++++++++
fs/squashfs3/squashfs2_0.c | 740 ++++++++++++++
fs/squashfs3/squashfs3.h | 81 +
fs/squashfs3/squashfs3_fs.h | 934 +++++++++++++++++
fs/squashfs3/squashfs3_fs_i.h | 45
fs/squashfs3/squashfs3_fs_sb.h | 79 +
init/do_mounts_rd.c | 17
11 files changed, 4116 insertions(+), 1 deletion(-)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -238,6 +238,7 @@ source "fs/jffs2/Kconfig"
source "fs/ubifs/Kconfig"
source "fs/cramfs/Kconfig"
source "fs/squashfs/Kconfig"
+source "fs/squashfs3/Kconfig"
source "fs/freevxfs/Kconfig"
source "fs/minix/Kconfig"
source "fs/omfs/Kconfig"
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -73,6 +73,7 @@ obj-$(CONFIG_EXT2_FS) += ext2/
obj-$(CONFIG_JBD2) += jbd2/
obj-$(CONFIG_CRAMFS) += cramfs/
obj-$(CONFIG_SQUASHFS) += squashfs/
+obj-$(CONFIG_SQUASHFS3) += squashfs3/
obj-y += ramfs/
obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
obj-$(CONFIG_CODA_FS) += coda/
--- /dev/null
+++ b/fs/squashfs3/Kconfig
@@ -0,0 +1,49 @@
+config SQUASHFS3
+ tristate "SquashFS 3.4 - Squashed file system support"
+ select ZLIB_INFLATE
+ help
+ Saying Y here includes support for SquashFS 3.4 (a Compressed
+ filesystem for Linux. It uses zlib compression to compress both
+ files, inodes and directories. Inodes in the system are very small
+ and all blocks are packed to minimise data overhead. Block sizes
+ greater than 4K are supported up to a maximum of 1 Mbytes (default
+ block size 128K). SquashFS 3.3 supports 64 bit filesystems and files
+ (larger than 4GB), full uid/gid information, hard links and timestamps.
+
+ Squashfs is intended for general read-only filesystem use, for
+ archival use (i.e. in cases where a .tar.gz file may be used), and in
+ embedded systems where low overhead is needed. Further information
+ and filesystem tools are available from http://squashfs.sourceforge.net.
+
+ If you want to compile this as a module ( = code which can be
+ inserted in and removed from the running kernel whenever you want),
+ say M here and read <file:Documentation/modules.txt>. The module
+ will be called squashfs. Note that the root file system (the one
+ containing the directory /) cannot be compiled as a module.
+
+ If unsure, say N.
+
+config SQUASHFS3_EMBEDDED
+
+ bool "Additional option for memory-constrained systems"
+ depends on SQUASHFS3
+ default n
+ help
+ Saying Y here allows you to specify cache size.
+
+ If unsure, say N.
+
+config SQUASHFS3_FRAGMENT_CACHE_SIZE
+ int "Number of fragments cached" if SQUASHFS3_EMBEDDED
+ depends on SQUASHFS3
+ default "3"
+ help
+ By default SquashFS caches the last 3 fragments read from
+ the filesystem. Increasing this amount may mean SquashFS
+ has to re-read fragments less often from disk, at the expense
+ of extra system memory. Decreasing this amount will mean
+ SquashFS uses less memory at the expense of extra reads from disk.
+
+ Note there must be at least one cached fragment. Anything
+ much more than three will probably not make much difference.
+
--- /dev/null
+++ b/fs/squashfs3/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux squashfs3 routines.
+#
+
+obj-$(CONFIG_SQUASHFS3) += squashfs3.o
+squashfs3-y += inode.o
+squashfs3-y += squashfs2_0.o
--- /dev/null
+++ b/fs/squashfs3/inode.c
@@ -0,0 +1,2163 @@
+/*
+ * Squashfs3 - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * inode.c
+ */
+
+#include <linux/module.h>
+#include <linux/zlib.h>
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/blk_types.h>
+#include <linux/vfs.h>
+#include <linux/vmalloc.h>
+#include <linux/spinlock.h>
+#include <linux/exportfs.h>
+#include <linux/sched.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
+
+#include "squashfs3_fs.h"
+#include "squashfs3_fs_sb.h"
+#include "squashfs3_fs_i.h"
+#include "squashfs3.h"
+
+static struct dentry *squashfs3_fh_to_dentry(struct super_block *s,
+ struct fid *fid, int fh_len, int fh_type);
+static struct dentry *squashfs3_fh_to_parent(struct super_block *s,
+ struct fid *fid, int fh_len, int fh_type);
+static struct dentry *squashfs3_get_parent(struct dentry *child);
+static int squashfs3_read_inode(struct inode *i, squashfs3_inode_t inode);
+static int squashfs3_statfs(struct dentry *, struct kstatfs *);
+static int squashfs3_symlink_readpage(struct file *file, struct page *page);
+static long long read_blocklist(struct inode *inode, int index,
+ int readahead_blks, char *block_list,
+ unsigned short **block_p, unsigned int *bsize);
+static int squashfs3_readpage(struct file *file, struct page *page);
+static int squashfs3_readdir(struct file *, struct dir_context *);
+static struct dentry *squashfs3_lookup(struct inode *, struct dentry *,
+ unsigned int);
+static int squashfs3_remount(struct super_block *s, int *flags, char *data);
+static void squashfs3_put_super(struct super_block *);
+static struct dentry *squashfs3_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data);
+static struct inode *squashfs3_alloc_inode(struct super_block *sb);
+static void squashfs3_destroy_inode(struct inode *inode);
+static int init_inodecache(void);
+static void destroy_inodecache(void);
+
+static struct file_system_type squashfs3_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "squashfs3",
+ .mount = squashfs3_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV
+};
+
+static const unsigned char squashfs3_filetype_table[] = {
+ DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
+};
+
+static struct super_operations squashfs3_super_ops = {
+ .alloc_inode = squashfs3_alloc_inode,
+ .destroy_inode = squashfs3_destroy_inode,
+ .statfs = squashfs3_statfs,
+ .put_super = squashfs3_put_super,
+ .remount_fs = squashfs3_remount
+};
+
+static struct export_operations squashfs3_export_ops = {
+ .fh_to_dentry = squashfs3_fh_to_dentry,
+ .fh_to_parent = squashfs3_fh_to_parent,
+ .get_parent = squashfs3_get_parent
+};
+
+SQSH_EXTERN const struct address_space_operations squashfs3_symlink_aops = {
+ .readpage = squashfs3_symlink_readpage
+};
+
+SQSH_EXTERN const struct address_space_operations squashfs3_aops = {
+ .readpage = squashfs3_readpage
+};
+
+static const struct file_operations squashfs3_dir_ops = {
+ .read = generic_read_dir,
+ .iterate = squashfs3_readdir
+};
+
+SQSH_EXTERN struct inode_operations squashfs3_dir_inode_ops = {
+ .lookup = squashfs3_lookup
+};
+
+
+static struct buffer_head *get_block_length(struct super_block *s,
+ int *cur_index, int *offset, int *c_byte)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ unsigned short temp;
+ struct buffer_head *bh;
+
+ if (!(bh = sb_bread(s, *cur_index)))
+ goto out;
+
+ if (msblk->devblksize - *offset == 1) {
+ if (msblk->swap)
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ (bh->b_data + *offset));
+ else
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ (bh->b_data + *offset));
+ brelse(bh);
+ if (!(bh = sb_bread(s, ++(*cur_index))))
+ goto out;
+ if (msblk->swap)
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ bh->b_data);
+ else
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ bh->b_data);
+ *c_byte = temp;
+ *offset = 1;
+ } else {
+ if (msblk->swap) {
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ (bh->b_data + *offset));
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ (bh->b_data + *offset + 1));
+ } else {
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ (bh->b_data + *offset));
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ (bh->b_data + *offset + 1));
+ }
+ *c_byte = temp;
+ *offset += 2;
+ }
+
+ if (SQUASHFS3_CHECK_DATA(msblk->sblk.flags)) {
+ if (*offset == msblk->devblksize) {
+ brelse(bh);
+ if (!(bh = sb_bread(s, ++(*cur_index))))
+ goto out;
+ *offset = 0;
+ }
+ if (*((unsigned char *) (bh->b_data + *offset)) !=
+ SQUASHFS3_MARKER_BYTE) {
+ ERROR("Metadata block marker corrupt @ %x\n",
+ *cur_index);
+ brelse(bh);
+ goto out;
+ }
+ (*offset)++;
+ }
+ return bh;
+
+out:
+ return NULL;
+}
+
+
+SQSH_EXTERN unsigned int squashfs3_read_data(struct super_block *s, char *buffer,
+ long long index, unsigned int length,
+ long long *next_index, int srclength)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ struct buffer_head **bh;
+ unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
+ unsigned int cur_index = index >> msblk->devblksize_log2;
+ int bytes, avail_bytes, b = 0, k = 0;
+ unsigned int compressed;
+ unsigned int c_byte = length;
+
+ bh = kmalloc(((sblk->block_size >> msblk->devblksize_log2) + 1) *
+ sizeof(struct buffer_head *), GFP_KERNEL);
+ if (bh == NULL)
+ goto read_failure;
+
+ if (c_byte) {
+ bytes = -offset;
+ compressed = SQUASHFS3_COMPRESSED_BLOCK(c_byte);
+ c_byte = SQUASHFS3_COMPRESSED_SIZE_BLOCK(c_byte);
+
+ TRACE("Block @ 0x%llx, %scompressed size %d, src size %d\n", index,
+ compressed ? "" : "un", (unsigned int) c_byte, srclength);
+
+ if (c_byte > srclength || index < 0 || (index + c_byte) > sblk->bytes_used)
+ goto read_failure;
+
+ for (b = 0; bytes < (int) c_byte; b++, cur_index++) {
+ bh[b] = sb_getblk(s, cur_index);
+ if (bh[b] == NULL)
+ goto block_release;
+ bytes += msblk->devblksize;
+ }
+ ll_rw_block(REQ_OP_READ, 0, b, bh);
+ } else {
+ if (index < 0 || (index + 2) > sblk->bytes_used)
+ goto read_failure;
+
+ bh[0] = get_block_length(s, &cur_index, &offset, &c_byte);
+ if (bh[0] == NULL)
+ goto read_failure;
+ b = 1;
+
+ bytes = msblk->devblksize - offset;
+ compressed = SQUASHFS3_COMPRESSED(c_byte);
+ c_byte = SQUASHFS3_COMPRESSED_SIZE(c_byte);
+
+ TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
+ ? "" : "un", (unsigned int) c_byte);
+
+ if (c_byte > srclength || (index + c_byte) > sblk->bytes_used)
+ goto block_release;
+
+ for (; bytes < c_byte; b++) {
+ bh[b] = sb_getblk(s, ++cur_index);
+ if (bh[b] == NULL)
+ goto block_release;
+ bytes += msblk->devblksize;
+ }
+ ll_rw_block(REQ_OP_READ, 0, b - 1, bh + 1);
+ }
+
+ if (compressed) {
+ int zlib_err = 0;
+
+ /*
+ * uncompress block
+ */
+
+ mutex_lock(&msblk->read_data_mutex);
+
+ msblk->stream.next_out = buffer;
+ msblk->stream.avail_out = srclength;
+
+ for (bytes = 0; k < b; k++) {
+ avail_bytes = min(c_byte - bytes, msblk->devblksize - offset);
+
+ wait_on_buffer(bh[k]);
+ if (!buffer_uptodate(bh[k]))
+ goto release_mutex;
+
+ msblk->stream.next_in = bh[k]->b_data + offset;
+ msblk->stream.avail_in = avail_bytes;
+
+ if (k == 0) {
+ zlib_err = zlib_inflateInit(&msblk->stream);
+ if (zlib_err != Z_OK) {
+ ERROR("zlib_inflateInit returned unexpected result 0x%x,"
+ " srclength %d\n", zlib_err, srclength);
+ goto release_mutex;
+ }
+
+ if (avail_bytes == 0) {
+ offset = 0;
+ brelse(bh[k]);
+ continue;
+ }
+ }
+
+ zlib_err = zlib_inflate(&msblk->stream, Z_NO_FLUSH);
+ if (zlib_err != Z_OK && zlib_err != Z_STREAM_END) {
+ ERROR("zlib_inflate returned unexpected result 0x%x,"
+ " srclength %d, avail_in %lx, avail_out %lx\n", zlib_err,
+ srclength, msblk->stream.avail_in, msblk->stream.avail_out);
+ goto release_mutex;
+ }
+
+ bytes += avail_bytes;
+ offset = 0;
+ brelse(bh[k]);
+ }
+
+ if (zlib_err != Z_STREAM_END)
+ goto release_mutex;
+
+ zlib_err = zlib_inflateEnd(&msblk->stream);
+ if (zlib_err != Z_OK) {
+ ERROR("zlib_inflateEnd returned unexpected result 0x%x,"
+ " srclength %d\n", zlib_err, srclength);
+ goto release_mutex;
+ }
+ bytes = msblk->stream.total_out;
+ mutex_unlock(&msblk->read_data_mutex);
+ } else {
+ int i;
+
+ for(i = 0; i < b; i++) {
+ wait_on_buffer(bh[i]);
+ if (!buffer_uptodate(bh[i]))
+ goto block_release;
+ }
+
+ for (bytes = 0; k < b; k++) {
+ avail_bytes = min(c_byte - bytes, msblk->devblksize - offset);
+
+ memcpy(buffer + bytes, bh[k]->b_data + offset, avail_bytes);
+ bytes += avail_bytes;
+ offset = 0;
+ brelse(bh[k]);
+ }
+ }
+
+ if (next_index)
+ *next_index = index + c_byte + (length ? 0 :
+ (SQUASHFS3_CHECK_DATA(msblk->sblk.flags) ? 3 : 2));
+
+ kfree(bh);
+ return bytes;
+
+release_mutex:
+ mutex_unlock(&msblk->read_data_mutex);
+
+block_release:
+ for (; k < b; k++)
+ brelse(bh[k]);
+
+read_failure:
+ ERROR("sb_bread failed reading block 0x%x\n", cur_index);
+ kfree(bh);
+ return 0;
+}
+
+
+static struct squashfs3_cache_entry *squashfs3_cache_get(struct super_block *s,
+ struct squashfs3_cache *cache, long long block, int length)
+{
+ int i, n;
+ struct squashfs3_cache_entry *entry;
+
+ spin_lock(&cache->lock);
+
+ while (1) {
+ for (i = 0; i < cache->entries && cache->entry[i].block != block; i++);
+
+ if (i == cache->entries) {
+ if (cache->unused_blks == 0) {
+ cache->waiting ++;
+ spin_unlock(&cache->lock);
+ wait_event(cache->wait_queue, cache->unused_blks);
+ spin_lock(&cache->lock);
+ cache->waiting --;
+ continue;
+ }
+
+ i = cache->next_blk;
+ for (n = 0; n < cache->entries; n++) {
+ if (cache->entry[i].locked == 0)
+ break;
+ i = (i + 1) % cache->entries;
+ }
+
+ cache->next_blk = (i + 1) % cache->entries;
+ entry = &cache->entry[i];
+
+ cache->unused_blks --;
+ entry->block = block;
+ entry->locked = 1;
+ entry->pending = 1;
+ entry->waiting = 0;
+ entry->error = 0;
+ spin_unlock(&cache->lock);
+
+ entry->length = squashfs3_read_data(s, entry->data,
+ block, length, &entry->next_index, cache->block_size);
+
+ spin_lock(&cache->lock);
+
+ if (entry->length == 0)
+ entry->error = 1;
+
+ entry->pending = 0;
+ spin_unlock(&cache->lock);
+ if (entry->waiting)
+ wake_up_all(&entry->wait_queue);
+ goto out;
+ }
+
+ entry = &cache->entry[i];
+ if (entry->locked == 0)
+ cache->unused_blks --;
+ entry->locked++;
+
+ if (entry->pending) {
+ entry->waiting ++;
+ spin_unlock(&cache->lock);
+ wait_event(entry->wait_queue, !entry->pending);
+ goto out;
+ }
+
+ spin_unlock(&cache->lock);
+ goto out;
+ }
+
+out:
+ TRACE("Got %s %d, start block %lld, locked %d, error %d\n", i,
+ cache->name, entry->block, entry->locked, entry->error);
+ if (entry->error)
+ ERROR("Unable to read %s cache entry [%llx]\n", cache->name, block);
+ return entry;
+}
+
+
+static void squashfs3_cache_put(struct squashfs3_cache *cache,
+ struct squashfs3_cache_entry *entry)
+{
+ spin_lock(&cache->lock);
+ entry->locked --;
+ if (entry->locked == 0) {
+ cache->unused_blks ++;
+ spin_unlock(&cache->lock);
+ if (cache->waiting)
+ wake_up(&cache->wait_queue);
+ } else
+ spin_unlock(&cache->lock);
+}
+
+
+static void squashfs3_cache_delete(struct squashfs3_cache *cache)
+{
+ int i;
+
+ if (cache == NULL)
+ return;
+
+ for (i = 0; i < cache->entries; i++)
+ if (cache->entry[i].data) {
+ if (cache->use_vmalloc)
+ vfree(cache->entry[i].data);
+ else
+ kfree(cache->entry[i].data);
+ }
+
+ kfree(cache);
+}
+
+
+static struct squashfs3_cache *squashfs3_cache_init(char *name, int entries,
+ int block_size, int use_vmalloc)
+{
+ int i;
+ struct squashfs3_cache *cache = kzalloc(sizeof(struct squashfs3_cache) +
+ entries * sizeof(struct squashfs3_cache_entry), GFP_KERNEL);
+ if (cache == NULL) {
+ ERROR("Failed to allocate %s cache\n", name);
+ goto failed;
+ }
+
+ cache->next_blk = 0;
+ cache->unused_blks = entries;
+ cache->entries = entries;
+ cache->block_size = block_size;
+ cache->use_vmalloc = use_vmalloc;
+ cache->name = name;
+ cache->waiting = 0;
+ spin_lock_init(&cache->lock);
+ init_waitqueue_head(&cache->wait_queue);
+
+ for (i = 0; i < entries; i++) {
+ init_waitqueue_head(&cache->entry[i].wait_queue);
+ cache->entry[i].block = SQUASHFS3_INVALID_BLK;
+ cache->entry[i].data = use_vmalloc ? vmalloc(block_size) :
+ kmalloc(block_size, GFP_KERNEL);
+ if (cache->entry[i].data == NULL) {
+ ERROR("Failed to allocate %s cache entry\n", name);
+ goto cleanup;
+ }
+ }
+
+ return cache;
+
+cleanup:
+ squashfs3_cache_delete(cache);
+failed:
+ return NULL;
+}
+
+
+SQSH_EXTERN int squashfs3_get_cached_block(struct super_block *s, void *buffer,
+ long long block, unsigned int offset,
+ int length, long long *next_block,
+ unsigned int *next_offset)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ int bytes, return_length = length;
+ struct squashfs3_cache_entry *entry;
+
+ TRACE("Entered squashfs3_get_cached_block [%llx:%x]\n", block, offset);
+
+ while (1) {
+ entry = squashfs3_cache_get(s, msblk->block_cache, block, 0);
+ bytes = entry->length - offset;
+
+ if (entry->error || bytes < 1) {
+ return_length = 0;
+ goto finish;
+ } else if (bytes >= length) {
+ if (buffer)
+ memcpy(buffer, entry->data + offset, length);
+ if (entry->length - offset == length) {
+ *next_block = entry->next_index;
+ *next_offset = 0;
+ } else {
+ *next_block = block;
+ *next_offset = offset + length;
+ }
+ goto finish;
+ } else {
+ if (buffer) {
+ memcpy(buffer, entry->data + offset, bytes);
+ buffer = (char *) buffer + bytes;
+ }
+ block = entry->next_index;
+ squashfs3_cache_put(msblk->block_cache, entry);
+ length -= bytes;
+ offset = 0;
+ }
+ }
+
+finish:
+ squashfs3_cache_put(msblk->block_cache, entry);
+ return return_length;
+}
+
+
+static int get_fragment_location(struct super_block *s, unsigned int fragment,
+ long long *fragment_start_block,
+ unsigned int *fragment_size)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ long long start_block =
+ msblk->fragment_index[SQUASHFS3_FRAGMENT_INDEX(fragment)];
+ int offset = SQUASHFS3_FRAGMENT_INDEX_OFFSET(fragment);
+ struct squashfs3_fragment_entry fragment_entry;
+
+ if (msblk->swap) {
+ struct squashfs3_fragment_entry sfragment_entry;
+
+ if (!squashfs3_get_cached_block(s, &sfragment_entry, start_block, offset,
+ sizeof(sfragment_entry), &start_block, &offset))
+ goto out;
+ SQUASHFS3_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
+ } else
+ if (!squashfs3_get_cached_block(s, &fragment_entry, start_block, offset,
+ sizeof(fragment_entry), &start_block, &offset))
+ goto out;
+
+ *fragment_start_block = fragment_entry.start_block;
+ *fragment_size = fragment_entry.size;
+
+ return 1;
+
+out:
+ return 0;
+}
+
+
+static void release_cached_fragment(struct squashfs3_sb_info *msblk,
+ struct squashfs3_cache_entry *fragment)
+{
+ squashfs3_cache_put(msblk->fragment_cache, fragment);
+}
+
+
+static struct squashfs3_cache_entry *get_cached_fragment(struct super_block *s,
+ long long start_block, int length)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+
+ return squashfs3_cache_get(s, msblk->fragment_cache, start_block, length);
+}
+
+
+static void squashfs3_new_inode(struct squashfs3_sb_info *msblk, struct inode *i,
+ struct squashfs3_base_inode_header *inodeb)
+{
+ i->i_ino = inodeb->inode_number;
+ i->i_mtime.tv_sec = inodeb->mtime;
+ i->i_atime.tv_sec = inodeb->mtime;
+ i->i_ctime.tv_sec = inodeb->mtime;
+ i->i_uid = make_kuid(&init_user_ns, msblk->uid[inodeb->uid]);
+ i->i_mode = inodeb->mode;
+ i->i_size = 0;
+
+ if (inodeb->guid == SQUASHFS3_GUIDS)
+ i->i_gid = make_kgid(&init_user_ns, msblk->uid[inodeb->uid]);
+ else
+ i->i_gid = make_kgid(&init_user_ns, msblk->guid[inodeb->guid]);
+}
+
+
+static squashfs3_inode_t squashfs3_inode_lookup(struct super_block *s, int ino)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ long long start = msblk->inode_lookup_table[SQUASHFS3_LOOKUP_BLOCK(ino - 1)];
+ int offset = SQUASHFS3_LOOKUP_BLOCK_OFFSET(ino - 1);
+ squashfs3_inode_t inode;
+
+ TRACE("Entered squashfs3_inode_lookup, inode_number = %d\n", ino);
+
+ if (msblk->swap) {
+ squashfs3_inode_t sinode;
+
+ if (!squashfs3_get_cached_block(s, &sinode, start, offset,
+ sizeof(sinode), &start, &offset))
+ goto out;
+ SQUASHFS3_SWAP_INODE_T((&inode), &sinode);
+ } else if (!squashfs3_get_cached_block(s, &inode, start, offset,
+ sizeof(inode), &start, &offset))
+ goto out;
+
+ TRACE("squashfs3_inode_lookup, inode = 0x%llx\n", inode);
+
+ return inode;
+
+out:
+ return SQUASHFS3_INVALID_BLK;
+}
+
+
+
+static struct dentry *squashfs3_export_iget(struct super_block *s,
+ unsigned int inode_number)
+{
+ squashfs3_inode_t inode;
+ struct dentry *dentry;
+
+ TRACE("Entered squashfs3_export_iget\n");
+
+ inode = squashfs3_inode_lookup(s, inode_number);
+ if(inode == SQUASHFS3_INVALID_BLK) {
+ dentry = ERR_PTR(-ENOENT);
+ goto failure;
+ }
+
+ dentry = d_obtain_alias(squashfs3_iget(s, inode, inode_number));
+
+failure:
+ return dentry;
+}
+
+
+static struct dentry *squashfs3_fh_to_dentry(struct super_block *s,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ if((fh_type != FILEID_INO32_GEN && fh_type != FILEID_INO32_GEN_PARENT) ||
+ fh_len < 2)
+ return NULL;
+
+ return squashfs3_export_iget(s, fid->i32.ino);
+}
+
+
+static struct dentry *squashfs3_fh_to_parent(struct super_block *s,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ if(fh_type != FILEID_INO32_GEN_PARENT || fh_len < 4)
+ return NULL;
+
+ return squashfs3_export_iget(s, fid->i32.parent_ino);
+}
+
+
+static struct dentry *squashfs3_get_parent(struct dentry *child)
+{
+ struct inode *i = child->d_inode;
+
+ TRACE("Entered squashfs3_get_parent\n");
+
+ return squashfs3_export_iget(i->i_sb, SQUASHFS3_I(i)->u.s2.parent_inode);
+}
+
+
+SQSH_EXTERN struct inode *squashfs3_iget(struct super_block *s,
+ squashfs3_inode_t inode, unsigned int inode_number)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct inode *i = iget_locked(s, inode_number);
+
+ TRACE("Entered squashfs3_iget\n");
+
+ if(i && (i->i_state & I_NEW)) {
+ (msblk->read_inode)(i, inode);
+ unlock_new_inode(i);
+ }
+
+ return i;
+}
+
+
+static int squashfs3_read_inode(struct inode *i, squashfs3_inode_t inode)
+{
+ struct super_block *s = i->i_sb;
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ long long block = SQUASHFS3_INODE_BLK(inode) + sblk->inode_table_start;
+ unsigned int offset = SQUASHFS3_INODE_OFFSET(inode);
+ long long next_block;
+ unsigned int next_offset;
+ union squashfs3_inode_header id, sid;
+ struct squashfs3_base_inode_header *inodeb = &id.base, *sinodeb = &sid.base;
+
+ TRACE("Entered squashfs3_read_inode\n");
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodeb, block, offset,
+ sizeof(*sinodeb), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_BASE_INODE_HEADER(inodeb, sinodeb, sizeof(*sinodeb));
+ } else
+ if (!squashfs3_get_cached_block(s, inodeb, block, offset,
+ sizeof(*inodeb), &next_block, &next_offset))
+ goto failed_read;
+
+ squashfs3_new_inode(msblk, i, inodeb);
+
+ switch(inodeb->inode_type) {
+ case SQUASHFS3_FILE_TYPE: {
+ unsigned int frag_size;
+ long long frag_blk;
+ struct squashfs3_reg_inode_header *inodep = &id.reg;
+ struct squashfs3_reg_inode_header *sinodep = &sid.reg;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodep, block, offset,
+ sizeof(*sinodep), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_REG_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, inodep, block, offset,
+ sizeof(*inodep), &next_block, &next_offset))
+ goto failed_read;
+
+ frag_blk = SQUASHFS3_INVALID_BLK;
+
+ if (inodep->fragment != SQUASHFS3_INVALID_FRAG)
+ if(!get_fragment_location(s, inodep->fragment, &frag_blk,
+ &frag_size))
+ goto failed_read;
+
+ set_nlink(i, 1);
+ i->i_size = inodep->file_size;
+ i->i_fop = &generic_ro_fops;
+ i->i_mode |= S_IFREG;
+ i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+ SQUASHFS3_I(i)->u.s1.fragment_start_block = frag_blk;
+ SQUASHFS3_I(i)->u.s1.fragment_size = frag_size;
+ SQUASHFS3_I(i)->u.s1.fragment_offset = inodep->offset;
+ SQUASHFS3_I(i)->start_block = inodep->start_block;
+ SQUASHFS3_I(i)->u.s1.block_list_start = next_block;
+ SQUASHFS3_I(i)->offset = next_offset;
+ i->i_data.a_ops = &squashfs3_aops;
+
+ TRACE("File inode %x:%x, start_block %llx, "
+ "block_list_start %llx, offset %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ inodep->start_block, next_block,
+ next_offset);
+ break;
+ }
+ case SQUASHFS3_LREG_TYPE: {
+ unsigned int frag_size;
+ long long frag_blk;
+ struct squashfs3_lreg_inode_header *inodep = &id.lreg;
+ struct squashfs3_lreg_inode_header *sinodep = &sid.lreg;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodep, block, offset,
+ sizeof(*sinodep), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_LREG_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, inodep, block, offset,
+ sizeof(*inodep), &next_block, &next_offset))
+ goto failed_read;
+
+ frag_blk = SQUASHFS3_INVALID_BLK;
+
+ if (inodep->fragment != SQUASHFS3_INVALID_FRAG)
+ if (!get_fragment_location(s, inodep->fragment, &frag_blk,
+ &frag_size))
+ goto failed_read;
+
+ set_nlink(i, inodep->nlink);
+ i->i_size = inodep->file_size;
+ i->i_fop = &generic_ro_fops;
+ i->i_mode |= S_IFREG;
+ i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+ SQUASHFS3_I(i)->u.s1.fragment_start_block = frag_blk;
+ SQUASHFS3_I(i)->u.s1.fragment_size = frag_size;
+ SQUASHFS3_I(i)->u.s1.fragment_offset = inodep->offset;
+ SQUASHFS3_I(i)->start_block = inodep->start_block;
+ SQUASHFS3_I(i)->u.s1.block_list_start = next_block;
+ SQUASHFS3_I(i)->offset = next_offset;
+ i->i_data.a_ops = &squashfs3_aops;
+
+ TRACE("File inode %x:%x, start_block %llx, "
+ "block_list_start %llx, offset %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ inodep->start_block, next_block,
+ next_offset);
+ break;
+ }
+ case SQUASHFS3_DIR_TYPE: {
+ struct squashfs3_dir_inode_header *inodep = &id.dir;
+ struct squashfs3_dir_inode_header *sinodep = &sid.dir;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodep, block, offset,
+ sizeof(*sinodep), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_DIR_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, inodep, block, offset,
+ sizeof(*inodep), &next_block, &next_offset))
+ goto failed_read;
+
+ set_nlink(i, inodep->nlink);
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs3_dir_inode_ops;
+ i->i_fop = &squashfs3_dir_ops;
+ i->i_mode |= S_IFDIR;
+ SQUASHFS3_I(i)->start_block = inodep->start_block;
+ SQUASHFS3_I(i)->offset = inodep->offset;
+ SQUASHFS3_I(i)->u.s2.directory_index_count = 0;
+ SQUASHFS3_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+ TRACE("Directory inode %x:%x, start_block %x, offset "
+ "%x\n", SQUASHFS3_INODE_BLK(inode),
+ offset, inodep->start_block,
+ inodep->offset);
+ break;
+ }
+ case SQUASHFS3_LDIR_TYPE: {
+ struct squashfs3_ldir_inode_header *inodep = &id.ldir;
+ struct squashfs3_ldir_inode_header *sinodep = &sid.ldir;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodep, block, offset,
+ sizeof(*sinodep), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_LDIR_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, inodep, block, offset,
+ sizeof(*inodep), &next_block, &next_offset))
+ goto failed_read;
+
+ set_nlink(i, inodep->nlink);
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs3_dir_inode_ops;
+ i->i_fop = &squashfs3_dir_ops;
+ i->i_mode |= S_IFDIR;
+ SQUASHFS3_I(i)->start_block = inodep->start_block;
+ SQUASHFS3_I(i)->offset = inodep->offset;
+ SQUASHFS3_I(i)->u.s2.directory_index_start = next_block;
+ SQUASHFS3_I(i)->u.s2.directory_index_offset = next_offset;
+ SQUASHFS3_I(i)->u.s2.directory_index_count = inodep->i_count;
+ SQUASHFS3_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+ TRACE("Long directory inode %x:%x, start_block %x, offset %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ inodep->start_block, inodep->offset);
+ break;
+ }
+ case SQUASHFS3_SYMLINK_TYPE: {
+ struct squashfs3_symlink_inode_header *inodep = &id.symlink;
+ struct squashfs3_symlink_inode_header *sinodep = &sid.symlink;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodep, block, offset,
+ sizeof(*sinodep), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_SYMLINK_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, inodep, block, offset,
+ sizeof(*inodep), &next_block, &next_offset))
+ goto failed_read;
+
+ set_nlink(i, inodep->nlink);
+ i->i_size = inodep->symlink_size;
+ i->i_op = &page_symlink_inode_operations;
+ i->i_data.a_ops = &squashfs3_symlink_aops;
+ i->i_mode |= S_IFLNK;
+ SQUASHFS3_I(i)->start_block = next_block;
+ SQUASHFS3_I(i)->offset = next_offset;
+
+ TRACE("Symbolic link inode %x:%x, start_block %llx, offset %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ next_block, next_offset);
+ break;
+ }
+ case SQUASHFS3_BLKDEV_TYPE:
+ case SQUASHFS3_CHRDEV_TYPE: {
+ struct squashfs3_dev_inode_header *inodep = &id.dev;
+ struct squashfs3_dev_inode_header *sinodep = &sid.dev;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodep, block, offset,
+ sizeof(*sinodep), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_DEV_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, inodep, block, offset,
+ sizeof(*inodep), &next_block, &next_offset))
+ goto failed_read;
+
+ set_nlink(i, inodep->nlink);
+ i->i_mode |= (inodeb->inode_type == SQUASHFS3_CHRDEV_TYPE) ?
+ S_IFCHR : S_IFBLK;
+ init_special_inode(i, i->i_mode, old_decode_dev(inodep->rdev));
+
+ TRACE("Device inode %x:%x, rdev %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset, inodep->rdev);
+ break;
+ }
+ case SQUASHFS3_FIFO_TYPE:
+ case SQUASHFS3_SOCKET_TYPE: {
+ struct squashfs3_ipc_inode_header *inodep = &id.ipc;
+ struct squashfs3_ipc_inode_header *sinodep = &sid.ipc;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, sinodep, block, offset,
+ sizeof(*sinodep), &next_block, &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_IPC_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, inodep, block, offset,
+ sizeof(*inodep), &next_block, &next_offset))
+ goto failed_read;
+
+ set_nlink(i, inodep->nlink);
+ i->i_mode |= (inodeb->inode_type == SQUASHFS3_FIFO_TYPE)
+ ? S_IFIFO : S_IFSOCK;
+ init_special_inode(i, i->i_mode, 0);
+ break;
+ }
+ default:
+ ERROR("Unknown inode type %d in squashfs3_iget!\n",
+ inodeb->inode_type);
+ goto failed_read1;
+ }
+
+ return 1;
+
+failed_read:
+ ERROR("Unable to read inode [%llx:%x]\n", block, offset);
+
+failed_read1:
+ make_bad_inode(i);
+ return 0;
+}
+
+
+static int read_inode_lookup_table(struct super_block *s)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ unsigned int length = SQUASHFS3_LOOKUP_BLOCK_BYTES(sblk->inodes);
+
+ TRACE("In read_inode_lookup_table, length %d\n", length);
+
+ /* Allocate inode lookup table */
+ msblk->inode_lookup_table = kmalloc(length, GFP_KERNEL);
+ if (msblk->inode_lookup_table == NULL) {
+ ERROR("Failed to allocate inode lookup table\n");
+ return 0;
+ }
+
+ if (!squashfs3_read_data(s, (char *) msblk->inode_lookup_table,
+ sblk->lookup_table_start, length |
+ SQUASHFS3_COMPRESSED_BIT_BLOCK, NULL, length)) {
+ ERROR("unable to read inode lookup table\n");
+ return 0;
+ }
+
+ if (msblk->swap) {
+ int i;
+ long long block;
+
+ for (i = 0; i < SQUASHFS3_LOOKUP_BLOCKS(sblk->inodes); i++) {
+ /* XXX */
+ SQUASHFS3_SWAP_LOOKUP_BLOCKS((&block),
+ &msblk->inode_lookup_table[i], 1);
+ msblk->inode_lookup_table[i] = block;
+ }
+ }
+
+ return 1;
+}
+
+
+static int read_fragment_index_table(struct super_block *s)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ unsigned int length = SQUASHFS3_FRAGMENT_INDEX_BYTES(sblk->fragments);
+
+ if(length == 0)
+ return 1;
+
+ /* Allocate fragment index table */
+ msblk->fragment_index = kmalloc(length, GFP_KERNEL);
+ if (msblk->fragment_index == NULL) {
+ ERROR("Failed to allocate fragment index table\n");
+ return 0;
+ }
+
+ if (!squashfs3_read_data(s, (char *) msblk->fragment_index,
+ sblk->fragment_table_start, length |
+ SQUASHFS3_COMPRESSED_BIT_BLOCK, NULL, length)) {
+ ERROR("unable to read fragment index table\n");
+ return 0;
+ }
+
+ if (msblk->swap) {
+ int i;
+ long long fragment;
+
+ for (i = 0; i < SQUASHFS3_FRAGMENT_INDEXES(sblk->fragments); i++) {
+ /* XXX */
+ SQUASHFS3_SWAP_FRAGMENT_INDEXES((&fragment),
+ &msblk->fragment_index[i], 1);
+ msblk->fragment_index[i] = fragment;
+ }
+ }
+
+ return 1;
+}
+
+
+static int supported_squashfs3_filesystem(struct squashfs3_sb_info *msblk, int silent)
+{
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+
+ msblk->read_inode = squashfs3_read_inode;
+ msblk->read_blocklist = read_blocklist;
+ msblk->read_fragment_index_table = read_fragment_index_table;
+
+ if (sblk->s_major == 1) {
+ if (!squashfs3_1_0_supported(msblk)) {
+ SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems "
+ "are unsupported\n");
+ SERROR("Please recompile with Squashfs 1.0 support enabled\n");
+ return 0;
+ }
+ } else if (sblk->s_major == 2) {
+ if (!squashfs3_2_0_supported(msblk)) {
+ SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems "
+ "are unsupported\n");
+ SERROR("Please recompile with Squashfs 2.0 support enabled\n");
+ return 0;
+ }
+ } else if(sblk->s_major != SQUASHFS3_MAJOR || sblk->s_minor >
+ SQUASHFS3_MINOR) {
+ SERROR("Major/Minor mismatch, trying to mount newer %d.%d "
+ "filesystem\n", sblk->s_major, sblk->s_minor);
+ SERROR("Please update your kernel\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+
+static int squashfs3_fill_super(struct super_block *s, void *data, int silent)
+{
+ struct squashfs3_sb_info *msblk;
+ struct squashfs3_super_block *sblk;
+ char b[BDEVNAME_SIZE];
+ struct inode *root;
+
+ TRACE("Entered squashfs3_fill_superblock\n");
+
+ s->s_fs_info = kzalloc(sizeof(struct squashfs3_sb_info), GFP_KERNEL);
+ if (s->s_fs_info == NULL) {
+ ERROR("Failed to allocate superblock\n");
+ goto failure;
+ }
+ msblk = s->s_fs_info;
+
+ msblk->stream.workspace = vmalloc(zlib_inflate_workspacesize());
+ if (msblk->stream.workspace == NULL) {
+ ERROR("Failed to allocate zlib workspace\n");
+ goto failure;
+ }
+ sblk = &msblk->sblk;
+
+ msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
+ msblk->devblksize_log2 = ffz(~msblk->devblksize);
+
+ mutex_init(&msblk->read_data_mutex);
+ mutex_init(&msblk->read_page_mutex);
+ mutex_init(&msblk->meta_index_mutex);
+
+ /* sblk->bytes_used is checked in squashfs3_read_data to ensure reads are not
+ * beyond filesystem end. As we're using squashfs3_read_data to read sblk here,
+ * first set sblk->bytes_used to a useful value */
+ sblk->bytes_used = sizeof(struct squashfs3_super_block);
+ if (!squashfs3_read_data(s, (char *) sblk, SQUASHFS3_START,
+ sizeof(struct squashfs3_super_block) |
+ SQUASHFS3_COMPRESSED_BIT_BLOCK, NULL, sizeof(struct squashfs3_super_block))) {
+ SERROR("unable to read superblock\n");
+ goto failed_mount;
+ }
+
+ /* Check it is a SQUASHFS3 superblock */
+ if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) {
+ if (sblk->s_magic == SQUASHFS3_MAGIC_SWAP) {
+ struct squashfs3_super_block ssblk;
+
+ WARNING("Mounting a different endian SQUASHFS3 filesystem on %s\n",
+ bdevname(s->s_bdev, b));
+
+ SQUASHFS3_SWAP_SUPER_BLOCK(&ssblk, sblk);
+ memcpy(sblk, &ssblk, sizeof(struct squashfs3_super_block));
+ msblk->swap = 1;
+ } else {
+ if (!silent)
+ SERROR("Can't find a SQUASHFS3 superblock on %s\n",
+ bdevname(s->s_bdev, b));
+ goto failed_mount;
+ }
+ }
+
+ /* Check the MAJOR & MINOR versions */
+ if(!supported_squashfs3_filesystem(msblk, silent))
+ goto failed_mount;
+
+ /* Check the filesystem does not extend beyond the end of the
+ block device */
+ if(sblk->bytes_used < 0 || sblk->bytes_used > i_size_read(s->s_bdev->bd_inode))
+ goto failed_mount;
+
+ /* Check the root inode for sanity */
+ if (SQUASHFS3_INODE_OFFSET(sblk->root_inode) > SQUASHFS3_METADATA_SIZE)
+ goto failed_mount;
+
+ TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b));
+ TRACE("Inodes are %scompressed\n", SQUASHFS3_UNCOMPRESSED_INODES(sblk->flags)
+ ? "un" : "");
+ TRACE("Data is %scompressed\n", SQUASHFS3_UNCOMPRESSED_DATA(sblk->flags)
+ ? "un" : "");
+ TRACE("Check data is %spresent in the filesystem\n",
+ SQUASHFS3_CHECK_DATA(sblk->flags) ? "" : "not ");
+ TRACE("Filesystem size %lld bytes\n", sblk->bytes_used);
+ TRACE("Block size %d\n", sblk->block_size);
+ TRACE("Number of inodes %d\n", sblk->inodes);
+ if (sblk->s_major > 1)
+ TRACE("Number of fragments %d\n", sblk->fragments);
+ TRACE("Number of uids %d\n", sblk->no_uids);
+ TRACE("Number of gids %d\n", sblk->no_guids);
+ TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start);
+ TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start);
+ if (sblk->s_major > 1)
+ TRACE("sblk->fragment_table_start %llx\n", sblk->fragment_table_start);
+ TRACE("sblk->uid_start %llx\n", sblk->uid_start);
+
+ s->s_maxbytes = MAX_LFS_FILESIZE;
+ s->s_flags |= MS_RDONLY;
+ s->s_op = &squashfs3_super_ops;
+
+ msblk->block_cache = squashfs3_cache_init("metadata", SQUASHFS3_CACHED_BLKS,
+ SQUASHFS3_METADATA_SIZE, 0);
+ if (msblk->block_cache == NULL)
+ goto failed_mount;
+
+ /* Allocate read_page block */
+ msblk->read_page = vmalloc(sblk->block_size);
+ if (msblk->read_page == NULL) {
+ ERROR("Failed to allocate read_page block\n");
+ goto failed_mount;
+ }
+
+ /* Allocate uid and gid tables */
+ msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
+ sizeof(unsigned int), GFP_KERNEL);
+ if (msblk->uid == NULL) {
+ ERROR("Failed to allocate uid/gid table\n");
+ goto failed_mount;
+ }
+ msblk->guid = msblk->uid + sblk->no_uids;
+
+ if (msblk->swap) {
+ unsigned int suid[sblk->no_uids + sblk->no_guids];
+
+ if (!squashfs3_read_data(s, (char *) &suid, sblk->uid_start,
+ ((sblk->no_uids + sblk->no_guids) *
+ sizeof(unsigned int)) |
+ SQUASHFS3_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) {
+ ERROR("unable to read uid/gid table\n");
+ goto failed_mount;
+ }
+
+ SQUASHFS3_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
+ sblk->no_guids), (sizeof(unsigned int) * 8));
+ } else
+ if (!squashfs3_read_data(s, (char *) msblk->uid, sblk->uid_start,
+ ((sblk->no_uids + sblk->no_guids) *
+ sizeof(unsigned int)) |
+ SQUASHFS3_COMPRESSED_BIT_BLOCK, NULL, (sblk->no_uids + sblk->no_guids) * sizeof(unsigned int))) {
+ ERROR("unable to read uid/gid table\n");
+ goto failed_mount;
+ }
+
+
+ if (sblk->s_major == 1 && squashfs3_1_0_supported(msblk))
+ goto allocate_root;
+
+ msblk->fragment_cache = squashfs3_cache_init("fragment",
+ SQUASHFS3_CACHED_FRAGMENTS, sblk->block_size, 1);
+ if (msblk->fragment_cache == NULL)
+ goto failed_mount;
+
+ /* Allocate and read fragment index table */
+ if (msblk->read_fragment_index_table(s) == 0)
+ goto failed_mount;
+
+ if(sblk->s_major < 3 || sblk->lookup_table_start == SQUASHFS3_INVALID_BLK)
+ goto allocate_root;
+
+ /* Allocate and read inode lookup table */
+ if (read_inode_lookup_table(s) == 0)
+ goto failed_mount;
+
+ s->s_export_op = &squashfs3_export_ops;
+
+allocate_root:
+ root = new_inode(s);
+ if ((msblk->read_inode)(root, sblk->root_inode) == 0)
+ goto failed_mount;
+ insert_inode_hash(root);
+
+ s->s_root = d_make_root(root);
+ if (s->s_root == NULL) {
+ ERROR("Root inode create failed\n");
+ goto failed_mount;
+ }
+
+ TRACE("Leaving squashfs3_fill_super\n");
+ return 0;
+
+failed_mount:
+ kfree(msblk->inode_lookup_table);
+ kfree(msblk->fragment_index);
+ squashfs3_cache_delete(msblk->fragment_cache);
+ kfree(msblk->uid);
+ vfree(msblk->read_page);
+ squashfs3_cache_delete(msblk->block_cache);
+ kfree(msblk->fragment_index_2);
+ vfree(msblk->stream.workspace);
+ kfree(s->s_fs_info);
+ s->s_fs_info = NULL;
+ return -EINVAL;
+
+failure:
+ return -ENOMEM;
+}
+
+
+static int squashfs3_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct squashfs3_sb_info *msblk = dentry->d_sb->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+
+ TRACE("Entered squashfs3_statfs\n");
+
+ buf->f_type = SQUASHFS_MAGIC;
+ buf->f_bsize = sblk->block_size;
+ buf->f_blocks = ((sblk->bytes_used - 1) >> sblk->block_log) + 1;
+ buf->f_bfree = buf->f_bavail = 0;
+ buf->f_files = sblk->inodes;
+ buf->f_ffree = 0;
+ buf->f_namelen = SQUASHFS3_NAME_LEN;
+
+ return 0;
+}
+
+
+static int squashfs3_symlink_readpage(struct file *file, struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ int index = page->index << PAGE_SHIFT, length, bytes, avail_bytes;
+ long long block = SQUASHFS3_I(inode)->start_block;
+ int offset = SQUASHFS3_I(inode)->offset;
+ void *pageaddr = kmap(page);
+
+ TRACE("Entered squashfs3_symlink_readpage, page index %ld, start block "
+ "%llx, offset %x\n", page->index,
+ SQUASHFS3_I(inode)->start_block,
+ SQUASHFS3_I(inode)->offset);
+
+ for (length = 0; length < index; length += bytes) {
+ bytes = squashfs3_get_cached_block(inode->i_sb, NULL, block,
+ offset, PAGE_SIZE, &block, &offset);
+ if (bytes == 0) {
+ ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
+ goto skip_read;
+ }
+ }
+
+ if (length != index) {
+ ERROR("(squashfs3_symlink_readpage) length != index\n");
+ bytes = 0;
+ goto skip_read;
+ }
+
+ avail_bytes = min_t(int, i_size_read(inode) - length, PAGE_SIZE);
+
+ bytes = squashfs3_get_cached_block(inode->i_sb, pageaddr, block, offset,
+ avail_bytes, &block, &offset);
+ if (bytes == 0)
+ ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
+
+skip_read:
+ memset(pageaddr + bytes, 0, PAGE_SIZE - bytes);
+ kunmap(page);
+ flush_dcache_page(page);
+ SetPageUptodate(page);
+ unlock_page(page);
+
+ return 0;
+}
+
+
+static struct squashfs3_meta_index *locate_meta_index(struct inode *inode, int index, int offset)
+{
+ struct squashfs3_meta_index *meta = NULL;
+ struct squashfs3_sb_info *msblk = inode->i_sb->s_fs_info;
+ int i;
+
+ mutex_lock(&msblk->meta_index_mutex);
+
+ TRACE("locate_meta_index: index %d, offset %d\n", index, offset);
+
+ if (msblk->meta_index == NULL)
+ goto not_allocated;
+
+ for (i = 0; i < SQUASHFS3_META_NUMBER; i ++) {
+ if (msblk->meta_index[i].inode_number == inode->i_ino &&
+ msblk->meta_index[i].offset >= offset &&
+ msblk->meta_index[i].offset <= index &&
+ msblk->meta_index[i].locked == 0) {
+ TRACE("locate_meta_index: entry %d, offset %d\n", i,
+ msblk->meta_index[i].offset);
+ meta = &msblk->meta_index[i];
+ offset = meta->offset;
+ }
+ }
+
+ if (meta)
+ meta->locked = 1;
+
+not_allocated:
+ mutex_unlock(&msblk->meta_index_mutex);
+
+ return meta;
+}
+
+
+static struct squashfs3_meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
+{
+ struct squashfs3_sb_info *msblk = inode->i_sb->s_fs_info;
+ struct squashfs3_meta_index *meta = NULL;
+ int i;
+
+ mutex_lock(&msblk->meta_index_mutex);
+
+ TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
+
+ if (msblk->meta_index == NULL) {
+ msblk->meta_index = kmalloc(sizeof(struct squashfs3_meta_index) *
+ SQUASHFS3_META_NUMBER, GFP_KERNEL);
+ if (msblk->meta_index == NULL) {
+ ERROR("Failed to allocate meta_index\n");
+ goto failed;
+ }
+ for (i = 0; i < SQUASHFS3_META_NUMBER; i++) {
+ msblk->meta_index[i].inode_number = 0;
+ msblk->meta_index[i].locked = 0;
+ }
+ msblk->next_meta_index = 0;
+ }
+
+ for (i = SQUASHFS3_META_NUMBER; i &&
+ msblk->meta_index[msblk->next_meta_index].locked; i --)
+ msblk->next_meta_index = (msblk->next_meta_index + 1) %
+ SQUASHFS3_META_NUMBER;
+
+ if (i == 0) {
+ TRACE("empty_meta_index: failed!\n");
+ goto failed;
+ }
+
+ TRACE("empty_meta_index: returned meta entry %d, %p\n",
+ msblk->next_meta_index,
+ &msblk->meta_index[msblk->next_meta_index]);
+
+ meta = &msblk->meta_index[msblk->next_meta_index];
+ msblk->next_meta_index = (msblk->next_meta_index + 1) %
+ SQUASHFS3_META_NUMBER;
+
+ meta->inode_number = inode->i_ino;
+ meta->offset = offset;
+ meta->skip = skip;
+ meta->entries = 0;
+ meta->locked = 1;
+
+failed:
+ mutex_unlock(&msblk->meta_index_mutex);
+ return meta;
+}
+
+
+static void release_meta_index(struct inode *inode, struct squashfs3_meta_index *meta)
+{
+ meta->locked = 0;
+ smp_mb();
+}
+
+
+static int read_block_index(struct super_block *s, int blocks, char *block_list,
+ long long *start_block, int *offset)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ unsigned int *block_listp;
+ int block = 0;
+
+ if (msblk->swap) {
+ char sblock_list[blocks << 2];
+
+ if (!squashfs3_get_cached_block(s, sblock_list, *start_block,
+ *offset, blocks << 2, start_block, offset)) {
+ ERROR("Fail reading block list [%llx:%x]\n", *start_block, *offset);
+ goto failure;
+ }
+ SQUASHFS3_SWAP_INTS(((unsigned int *)block_list),
+ ((unsigned int *)sblock_list), blocks);
+ } else {
+ if (!squashfs3_get_cached_block(s, block_list, *start_block,
+ *offset, blocks << 2, start_block, offset)) {
+ ERROR("Fail reading block list [%llx:%x]\n", *start_block, *offset);
+ goto failure;
+ }
+ }
+
+ for (block_listp = (unsigned int *) block_list; blocks;
+ block_listp++, blocks --)
+ block += SQUASHFS3_COMPRESSED_SIZE_BLOCK(*block_listp);
+
+ return block;
+
+failure:
+ return -1;
+}
+
+
+#define SIZE 256
+
+static inline int calculate_skip(int blocks) {
+ int skip = (blocks - 1) / ((SQUASHFS3_SLOTS * SQUASHFS3_META_ENTRIES + 1) * SQUASHFS3_META_INDEXES);
+ return skip >= 7 ? 7 : skip + 1;
+}
+
+
+static int get_meta_index(struct inode *inode, int index,
+ long long *index_block, int *index_offset,
+ long long *data_block, char *block_list)
+{
+ struct squashfs3_sb_info *msblk = inode->i_sb->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
+ int offset = 0;
+ struct squashfs3_meta_index *meta;
+ struct squashfs3_meta_entry *meta_entry;
+ long long cur_index_block = SQUASHFS3_I(inode)->u.s1.block_list_start;
+ int cur_offset = SQUASHFS3_I(inode)->offset;
+ long long cur_data_block = SQUASHFS3_I(inode)->start_block;
+ int i;
+
+ index /= SQUASHFS3_META_INDEXES * skip;
+
+ while (offset < index) {
+ meta = locate_meta_index(inode, index, offset + 1);
+
+ if (meta == NULL) {
+ meta = empty_meta_index(inode, offset + 1, skip);
+ if (meta == NULL)
+ goto all_done;
+ } else {
+ if(meta->entries == 0)
+ goto failed;
+ /* XXX */
+ offset = index < meta->offset + meta->entries ? index :
+ meta->offset + meta->entries - 1;
+ /* XXX */
+ meta_entry = &meta->meta_entry[offset - meta->offset];
+ cur_index_block = meta_entry->index_block + sblk->inode_table_start;
+ cur_offset = meta_entry->offset;
+ cur_data_block = meta_entry->data_block;
+ TRACE("get_meta_index: offset %d, meta->offset %d, "
+ "meta->entries %d\n", offset, meta->offset, meta->entries);
+ TRACE("get_meta_index: index_block 0x%llx, offset 0x%x"
+ " data_block 0x%llx\n", cur_index_block,
+ cur_offset, cur_data_block);
+ }
+
+ for (i = meta->offset + meta->entries; i <= index &&
+ i < meta->offset + SQUASHFS3_META_ENTRIES; i++) {
+ int blocks = skip * SQUASHFS3_META_INDEXES;
+
+ while (blocks) {
+ int block = blocks > (SIZE >> 2) ? (SIZE >> 2) : blocks;
+ int res = read_block_index(inode->i_sb, block, block_list,
+ &cur_index_block, &cur_offset);
+
+ if (res == -1)
+ goto failed;
+
+ cur_data_block += res;
+ blocks -= block;
+ }
+
+ meta_entry = &meta->meta_entry[i - meta->offset];
+ meta_entry->index_block = cur_index_block - sblk->inode_table_start;
+ meta_entry->offset = cur_offset;
+ meta_entry->data_block = cur_data_block;
+ meta->entries ++;
+ offset ++;
+ }
+
+ TRACE("get_meta_index: meta->offset %d, meta->entries %d\n",
+ meta->offset, meta->entries);
+
+ release_meta_index(inode, meta);
+ }
+
+all_done:
+ *index_block = cur_index_block;
+ *index_offset = cur_offset;
+ *data_block = cur_data_block;
+
+ return offset * SQUASHFS3_META_INDEXES * skip;
+
+failed:
+ release_meta_index(inode, meta);
+ return -1;
+}
+
+
+static long long read_blocklist(struct inode *inode, int index,
+ int readahead_blks, char *block_list,
+ unsigned short **block_p, unsigned int *bsize)
+{
+ long long block_ptr;
+ int offset;
+ long long block;
+ int res = get_meta_index(inode, index, &block_ptr, &offset, &block,
+ block_list);
+
+ TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset"
+ " 0x%x, block 0x%llx\n", res, index, block_ptr, offset, block);
+
+ if(res == -1)
+ goto failure;
+
+ index -= res;
+
+ while (index) {
+ int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index;
+ int res = read_block_index(inode->i_sb, blocks, block_list,
+ &block_ptr, &offset);
+ if (res == -1)
+ goto failure;
+ block += res;
+ index -= blocks;
+ }
+
+ if (read_block_index(inode->i_sb, 1, block_list, &block_ptr, &offset) == -1)
+ goto failure;
+ *bsize = *((unsigned int *) block_list);
+
+ return block;
+
+failure:
+ return 0;
+}
+
+
+static int squashfs3_readpage(struct file *file, struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ struct squashfs3_sb_info *msblk = inode->i_sb->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ unsigned char *block_list = NULL;
+ long long block;
+ unsigned int bsize, i;
+ int bytes;
+ int index = page->index >> (sblk->block_log - PAGE_SHIFT);
+ void *pageaddr;
+ struct squashfs3_cache_entry *fragment = NULL;
+ char *data_ptr = msblk->read_page;
+
+ int mask = (1 << (sblk->block_log - PAGE_SHIFT)) - 1;
+ int start_index = page->index & ~mask;
+ int end_index = start_index | mask;
+ int file_end = i_size_read(inode) >> sblk->block_log;
+ int sparse = 0;
+
+ TRACE("Entered squashfs3_readpage, page index %lx, start block %llx\n",
+ page->index, SQUASHFS3_I(inode)->start_block);
+
+ if (page->index >= ((i_size_read(inode) + PAGE_SIZE - 1) >>
+ PAGE_SHIFT))
+ goto out;
+
+ if (SQUASHFS3_I(inode)->u.s1.fragment_start_block == SQUASHFS3_INVALID_BLK
+ || index < file_end) {
+ block_list = kmalloc(SIZE, GFP_KERNEL);
+ if (block_list == NULL) {
+ ERROR("Failed to allocate block_list\n");
+ goto error_out;
+ }
+
+ block = (msblk->read_blocklist)(inode, index, 1, block_list, NULL, &bsize);
+ if (block == 0)
+ goto error_out;
+
+ if (bsize == 0) { /* hole */
+ bytes = index == file_end ?
+ (i_size_read(inode) & (sblk->block_size - 1)) : sblk->block_size;
+ sparse = 1;
+ } else {
+ mutex_lock(&msblk->read_page_mutex);
+
+ bytes = squashfs3_read_data(inode->i_sb, msblk->read_page, block,
+ bsize, NULL, sblk->block_size);
+
+ if (bytes == 0) {
+ ERROR("Unable to read page, block %llx, size %x\n", block, bsize);
+ mutex_unlock(&msblk->read_page_mutex);
+ goto error_out;
+ }
+ }
+ } else {
+ fragment = get_cached_fragment(inode->i_sb,
+ SQUASHFS3_I(inode)-> u.s1.fragment_start_block,
+ SQUASHFS3_I(inode)->u.s1.fragment_size);
+
+ if (fragment->error) {
+ ERROR("Unable to read page, block %llx, size %x\n",
+ SQUASHFS3_I(inode)->u.s1.fragment_start_block,
+ (int) SQUASHFS3_I(inode)->u.s1.fragment_size);
+ release_cached_fragment(msblk, fragment);
+ goto error_out;
+ }
+ bytes = i_size_read(inode) & (sblk->block_size - 1);
+ data_ptr = fragment->data + SQUASHFS3_I(inode)->u.s1.fragment_offset;
+ }
+
+ for (i = start_index; i <= end_index && bytes > 0; i++,
+ bytes -= PAGE_SIZE, data_ptr += PAGE_SIZE) {
+ struct page *push_page;
+ int avail = sparse ? 0 : min_t(unsigned int, bytes, PAGE_SIZE);
+
+ TRACE("bytes %d, i %d, available_bytes %d\n", bytes, i, avail);
+
+ push_page = (i == page->index) ? page :
+ grab_cache_page_nowait(page->mapping, i);
+
+ if (!push_page)
+ continue;
+
+ if (PageUptodate(push_page))
+ goto skip_page;
+
+ pageaddr = kmap_atomic(push_page);
+ memcpy(pageaddr, data_ptr, avail);
+ memset(pageaddr + avail, 0, PAGE_SIZE - avail);
+ kunmap_atomic(pageaddr);
+ flush_dcache_page(push_page);
+ SetPageUptodate(push_page);
+skip_page:
+ unlock_page(push_page);
+ if(i != page->index)
+ put_page(push_page);
+ }
+
+ if (SQUASHFS3_I(inode)->u.s1.fragment_start_block == SQUASHFS3_INVALID_BLK
+ || index < file_end) {
+ if (!sparse)
+ mutex_unlock(&msblk->read_page_mutex);
+ kfree(block_list);
+ } else
+ release_cached_fragment(msblk, fragment);
+
+ return 0;
+
+error_out:
+ SetPageError(page);
+out:
+ pageaddr = kmap_atomic(page);
+ memset(pageaddr, 0, PAGE_SIZE);
+ kunmap_atomic(pageaddr);
+ flush_dcache_page(page);
+ if (!PageError(page))
+ SetPageUptodate(page);
+ unlock_page(page);
+
+ kfree(block_list);
+ return 0;
+}
+
+
+static int get_dir_index_using_offset(struct super_block *s,
+ long long *next_block, unsigned int *next_offset,
+ long long index_start, unsigned int index_offset, int i_count,
+ long long f_pos)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ struct squashfs3_dir_index index;
+
+ TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
+ i_count, (unsigned int) f_pos);
+
+ f_pos -= 3;
+ if (f_pos == 0)
+ goto finish;
+
+ for (i = 0; i < i_count; i++) {
+ if (msblk->swap) {
+ struct squashfs3_dir_index sindex;
+ squashfs3_get_cached_block(s, &sindex, index_start, index_offset,
+ sizeof(sindex), &index_start, &index_offset);
+ SQUASHFS3_SWAP_DIR_INDEX(&index, &sindex);
+ } else
+ squashfs3_get_cached_block(s, &index, index_start, index_offset,
+ sizeof(index), &index_start, &index_offset);
+
+ if (index.index > f_pos)
+ break;
+
+ squashfs3_get_cached_block(s, NULL, index_start, index_offset,
+ index.size + 1, &index_start, &index_offset);
+
+ length = index.index;
+ *next_block = index.start_block + sblk->directory_table_start;
+ }
+
+ *next_offset = (length + *next_offset) % SQUASHFS3_METADATA_SIZE;
+
+finish:
+ return length + 3;
+}
+
+
+static int get_dir_index_using_name(struct super_block *s,
+ long long *next_block, unsigned int *next_offset,
+ long long index_start, unsigned int index_offset, int i_count,
+ const char *name, int size)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ struct squashfs3_dir_index *index;
+ char *str;
+
+ TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+ str = kmalloc(sizeof(struct squashfs3_dir_index) +
+ (SQUASHFS3_NAME_LEN + 1) * 2, GFP_KERNEL);
+ if (str == NULL) {
+ ERROR("Failed to allocate squashfs3_dir_index\n");
+ goto failure;
+ }
+
+ index = (struct squashfs3_dir_index *) (str + SQUASHFS3_NAME_LEN + 1);
+ strncpy(str, name, size);
+ str[size] = '\0';
+
+ for (i = 0; i < i_count; i++) {
+ if (msblk->swap) {
+ struct squashfs3_dir_index sindex;
+ squashfs3_get_cached_block(s, &sindex, index_start, index_offset,
+ sizeof(sindex), &index_start, &index_offset);
+ SQUASHFS3_SWAP_DIR_INDEX(index, &sindex);
+ } else
+ squashfs3_get_cached_block(s, index, index_start, index_offset,
+ sizeof(struct squashfs3_dir_index), &index_start, &index_offset);
+
+ squashfs3_get_cached_block(s, index->name, index_start, index_offset,
+ index->size + 1, &index_start, &index_offset);
+
+ index->name[index->size + 1] = '\0';
+
+ if (strcmp(index->name, str) > 0)
+ break;
+
+ length = index->index;
+ *next_block = index->start_block + sblk->directory_table_start;
+ }
+
+ *next_offset = (length + *next_offset) % SQUASHFS3_METADATA_SIZE;
+ kfree(str);
+
+failure:
+ return length + 3;
+}
+
+
+static int squashfs3_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *i = file_inode(file);
+ struct squashfs3_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS3_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS3_I(i)->offset, length = 0, dir_count;
+ struct squashfs3_dir_header dirh;
+ struct squashfs3_dir_entry *dire;
+
+ TRACE("Entered squashfs3_readdir [%llx:%x]\n", next_block, next_offset);
+
+ dire = kmalloc(sizeof(struct squashfs3_dir_entry) +
+ SQUASHFS3_NAME_LEN + 1, GFP_KERNEL);
+ if (dire == NULL) {
+ ERROR("Failed to allocate squashfs3_dir_entry\n");
+ goto finish;
+ }
+
+ while(ctx->pos < 3) {
+ char *name;
+ int size, i_ino;
+
+ if(ctx->pos == 0) {
+ name = ".";
+ size = 1;
+ i_ino = i->i_ino;
+ } else {
+ name = "..";
+ size = 2;
+ i_ino = SQUASHFS3_I(i)->u.s2.parent_inode;
+ }
+ TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
+ (unsigned int) ctx, name, size, (int)
+ ctx->pos, i_ino, squashfs3_filetype_table[1]);
+
+ if (!dir_emit(ctx, name, size, i_ino,
+ squashfs3_filetype_table[1])) {
+ TRACE("Filldir failed\n");
+ goto finish;
+ }
+ ctx->pos += size;
+ }
+
+ length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_start,
+ SQUASHFS3_I(i)->u.s2.directory_index_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_count, ctx->pos);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs3_dir_header sdirh;
+
+ if (!squashfs3_get_cached_block(i->i_sb, &sdirh, next_block,
+ next_offset, sizeof(sdirh), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS3_SWAP_DIR_HEADER(&dirh, &sdirh);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, &dirh, next_block,
+ next_offset, sizeof(dirh), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(dirh);
+ }
+
+ dir_count = dirh.count + 1;
+ while (dir_count--) {
+ if (msblk->swap) {
+ struct squashfs3_dir_entry sdire;
+ if (!squashfs3_get_cached_block(i->i_sb, &sdire, next_block,
+ next_offset, sizeof(sdire), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS3_SWAP_DIR_ENTRY(dire, &sdire);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, dire, next_block,
+ next_offset, sizeof(*dire), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(*dire);
+ }
+
+ if (!squashfs3_get_cached_block(i->i_sb, dire->name, next_block,
+ next_offset, dire->size + 1, &next_block, &next_offset))
+ goto failed_read;
+
+ length += dire->size + 1;
+
+ if (ctx->pos >= length)
+ continue;
+
+ dire->name[dire->size + 1] = '\0';
+
+ TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
+ (unsigned int) ctx, dire->name, dire->size + 1,
+ (int) ctx->pos, dirh.start_block, dire->offset,
+ dirh.inode_number + dire->inode_number,
+ squashfs3_filetype_table[dire->type]);
+
+ if (!dir_emit(ctx, dire->name, dire->size + 1,
+ dirh.inode_number + dire->inode_number,
+ squashfs3_filetype_table[dire->type])) {
+ TRACE("Filldir failed\n");
+ goto finish;
+ }
+ ctx->pos = length;
+ }
+ }
+
+finish:
+ kfree(dire);
+ return 0;
+
+failed_read:
+ ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+ next_offset);
+ kfree(dire);
+ return 0;
+}
+
+
+static struct dentry *squashfs3_lookup(struct inode *i, struct dentry *dentry,
+ unsigned int flags)
+{
+ const unsigned char *name = dentry->d_name.name;
+ int len = dentry->d_name.len;
+ struct inode *inode = NULL;
+ struct squashfs3_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS3_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS3_I(i)->offset, length = 0, dir_count;
+ struct squashfs3_dir_header dirh;
+ struct squashfs3_dir_entry *dire;
+
+ TRACE("Entered squashfs3_lookup [%llx:%x]\n", next_block, next_offset);
+
+ dire = kmalloc(sizeof(struct squashfs3_dir_entry) +
+ SQUASHFS3_NAME_LEN + 1, GFP_KERNEL);
+ if (dire == NULL) {
+ ERROR("Failed to allocate squashfs3_dir_entry\n");
+ goto exit_lookup;
+ }
+
+ if (len > SQUASHFS3_NAME_LEN)
+ goto exit_lookup;
+
+ length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_start,
+ SQUASHFS3_I(i)->u.s2.directory_index_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_count, name, len);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs3_dir_header sdirh;
+ if (!squashfs3_get_cached_block(i->i_sb, &sdirh, next_block,
+ next_offset, sizeof(sdirh), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS3_SWAP_DIR_HEADER(&dirh, &sdirh);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, &dirh, next_block,
+ next_offset, sizeof(dirh), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(dirh);
+ }
+
+ dir_count = dirh.count + 1;
+ while (dir_count--) {
+ if (msblk->swap) {
+ struct squashfs3_dir_entry sdire;
+ if (!squashfs3_get_cached_block(i->i_sb, &sdire, next_block,
+ next_offset, sizeof(sdire), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS3_SWAP_DIR_ENTRY(dire, &sdire);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, dire, next_block,
+ next_offset, sizeof(*dire), &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(*dire);
+ }
+
+ if (!squashfs3_get_cached_block(i->i_sb, dire->name, next_block,
+ next_offset, dire->size + 1, &next_block, &next_offset))
+ goto failed_read;
+
+ length += dire->size + 1;
+
+ if (name[0] < dire->name[0])
+ goto exit_lookup;
+
+ if ((len == dire->size + 1) && !strncmp(name, dire->name, len)) {
+ squashfs3_inode_t ino = SQUASHFS3_MKINODE(dirh.start_block,
+ dire->offset);
+
+ TRACE("calling squashfs3_iget for directory entry %s, inode"
+ " %x:%x, %d\n", name, dirh.start_block, dire->offset,
+ dirh.inode_number + dire->inode_number);
+
+ inode = squashfs3_iget(i->i_sb, ino, dirh.inode_number + dire->inode_number);
+
+ goto exit_lookup;
+ }
+ }
+ }
+
+exit_lookup:
+ kfree(dire);
+ if (inode)
+ return d_splice_alias(inode, dentry);
+ d_add(dentry, inode);
+ return ERR_PTR(0);
+
+failed_read:
+ ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+ next_offset);
+ goto exit_lookup;
+}
+
+
+static int squashfs3_remount(struct super_block *s, int *flags, char *data)
+{
+ *flags |= MS_RDONLY;
+ return 0;
+}
+
+
+static void squashfs3_put_super(struct super_block *s)
+{
+ if (s->s_fs_info) {
+ struct squashfs3_sb_info *sbi = s->s_fs_info;
+ squashfs3_cache_delete(sbi->block_cache);
+ squashfs3_cache_delete(sbi->fragment_cache);
+ vfree(sbi->read_page);
+ kfree(sbi->uid);
+ kfree(sbi->fragment_index);
+ kfree(sbi->fragment_index_2);
+ kfree(sbi->meta_index);
+ vfree(sbi->stream.workspace);
+ kfree(s->s_fs_info);
+ s->s_fs_info = NULL;
+ }
+}
+
+
+static struct dentry *squashfs3_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, squashfs3_fill_super);
+}
+
+
+static int __init init_squashfs3_fs(void)
+{
+ int err = init_inodecache();
+ if (err)
+ goto out;
+
+ printk(KERN_INFO "squashfs3: version 3.4 (2008/08/26) "
+ "Phillip Lougher\n");
+
+ err = register_filesystem(&squashfs3_fs_type);
+ if (err)
+ destroy_inodecache();
+
+out:
+ return err;
+}
+
+
+static void __exit exit_squashfs3_fs(void)
+{
+ unregister_filesystem(&squashfs3_fs_type);
+ destroy_inodecache();
+}
+
+
+static struct kmem_cache * squashfs3_inode_cachep;
+
+
+static struct inode *squashfs3_alloc_inode(struct super_block *sb)
+{
+ struct squashfs3_inode_info *ei;
+ ei = kmem_cache_alloc(squashfs3_inode_cachep, GFP_KERNEL);
+ return ei ? &ei->vfs_inode : NULL;
+}
+
+
+static void squashfs3_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(squashfs3_inode_cachep, SQUASHFS3_I(inode));
+}
+
+
+static void init_once(void *foo)
+{
+ struct squashfs3_inode_info *ei = foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+
+static int __init init_inodecache(void)
+{
+ squashfs3_inode_cachep = kmem_cache_create("squashfs3_inode_cache",
+ sizeof(struct squashfs3_inode_info), 0,
+ SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, init_once);
+ if (squashfs3_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+
+static void destroy_inodecache(void)
+{
+ kmem_cache_destroy(squashfs3_inode_cachep);
+}
+
+
+module_init(init_squashfs3_fs);
+module_exit(exit_squashfs3_fs);
+MODULE_DESCRIPTION("squashfs3 3.4, a compressed read-only filesystem");
+MODULE_AUTHOR("Phillip Lougher <phillip@lougher.demon.co.uk>");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/fs/squashfs3/squashfs2_0.c
@@ -0,0 +1,740 @@
+/*
+ * Squashfs3 - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs2_0.c
+ */
+
+#include <linux/module.h>
+#include <linux/zlib.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+
+#include "squashfs3_fs.h"
+#include "squashfs3_fs_sb.h"
+#include "squashfs3_fs_i.h"
+#include "squashfs3.h"
+static int squashfs3_readdir_2(struct file *file, struct dir_context *ctx);
+static struct dentry *squashfs3_lookup_2(struct inode *, struct dentry *,
+ unsigned int);
+
+static struct file_operations squashfs3_dir_ops_2 = {
+ .read = generic_read_dir,
+ .iterate = squashfs3_readdir_2
+};
+
+static struct inode_operations squashfs3_dir_inode_ops_2 = {
+ .lookup = squashfs3_lookup_2
+};
+
+static unsigned char squashfs3_filetype_table[] = {
+ DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
+};
+
+static int read_fragment_index_table_2(struct super_block *s)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+
+ if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS3_FRAGMENT_INDEX_BYTES_2
+ (sblk->fragments), GFP_KERNEL))) {
+ ERROR("Failed to allocate uid/gid table\n");
+ return 0;
+ }
+
+ if (SQUASHFS3_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
+ !squashfs3_read_data(s, (char *)
+ msblk->fragment_index_2,
+ sblk->fragment_table_start,
+ SQUASHFS3_FRAGMENT_INDEX_BYTES_2
+ (sblk->fragments) |
+ SQUASHFS3_COMPRESSED_BIT_BLOCK, NULL, SQUASHFS3_FRAGMENT_INDEX_BYTES_2(sblk->fragments))) {
+ ERROR("unable to read fragment index table\n");
+ return 0;
+ }
+
+ if (msblk->swap) {
+ int i;
+ unsigned int fragment;
+
+ for (i = 0; i < SQUASHFS3_FRAGMENT_INDEXES_2(sblk->fragments);
+ i++) {
+ SQUASHFS3_SWAP_FRAGMENT_INDEXES_2((&fragment),
+ &msblk->fragment_index_2[i], 1);
+ msblk->fragment_index_2[i] = fragment;
+ }
+ }
+
+ return 1;
+}
+
+
+static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
+ long long *fragment_start_block,
+ unsigned int *fragment_size)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ long long start_block =
+ msblk->fragment_index_2[SQUASHFS3_FRAGMENT_INDEX_2(fragment)];
+ int offset = SQUASHFS3_FRAGMENT_INDEX_OFFSET_2(fragment);
+ struct squashfs3_fragment_entry_2 fragment_entry;
+
+ if (msblk->swap) {
+ struct squashfs3_fragment_entry_2 sfragment_entry;
+
+ if (!squashfs3_get_cached_block(s, (char *) &sfragment_entry,
+ start_block, offset,
+ sizeof(sfragment_entry), &start_block,
+ &offset))
+ goto out;
+ SQUASHFS3_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
+ } else
+ if (!squashfs3_get_cached_block(s, (char *) &fragment_entry,
+ start_block, offset,
+ sizeof(fragment_entry), &start_block,
+ &offset))
+ goto out;
+
+ *fragment_start_block = fragment_entry.start_block;
+ *fragment_size = fragment_entry.size;
+
+ return 1;
+
+out:
+ return 0;
+}
+
+
+static void squashfs3_new_inode(struct squashfs3_sb_info *msblk, struct inode *i,
+ struct squashfs3_base_inode_header_2 *inodeb, unsigned int ino)
+{
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+
+ i->i_ino = ino;
+ i->i_mtime.tv_sec = sblk->mkfs_time;
+ i->i_atime.tv_sec = sblk->mkfs_time;
+ i->i_ctime.tv_sec = sblk->mkfs_time;
+ i->i_uid = make_kuid(&init_user_ns, msblk->uid[inodeb->uid]);
+ i->i_mode = inodeb->mode;
+ set_nlink(i, 1);
+ i->i_size = 0;
+ if (inodeb->guid == SQUASHFS3_GUIDS)
+ i->i_gid = make_kgid(&init_user_ns, msblk->uid[inodeb->uid]);
+ else
+ i->i_gid = make_kgid(&init_user_ns, msblk->guid[inodeb->guid]);
+}
+
+
+static int squashfs3_read_inode_2(struct inode *i, squashfs3_inode_t inode)
+{
+ struct super_block *s = i->i_sb;
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ unsigned int block = SQUASHFS3_INODE_BLK(inode) +
+ sblk->inode_table_start;
+ unsigned int offset = SQUASHFS3_INODE_OFFSET(inode);
+ unsigned int ino = SQUASHFS3_MK_VFS_INODE(block -
+ sblk->inode_table_start, offset);
+ long long next_block;
+ unsigned int next_offset;
+ union squashfs3_inode_header_2 id, sid;
+ struct squashfs3_base_inode_header_2 *inodeb = &id.base,
+ *sinodeb = &sid.base;
+
+ TRACE("Entered squashfs3_read_inode_2\n");
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, (char *) sinodeb, block,
+ offset, sizeof(*sinodeb), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
+ sizeof(*sinodeb));
+ } else
+ if (!squashfs3_get_cached_block(s, (char *) inodeb, block,
+ offset, sizeof(*inodeb), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ squashfs3_new_inode(msblk, i, inodeb, ino);
+
+ switch(inodeb->inode_type) {
+ case SQUASHFS3_FILE_TYPE: {
+ struct squashfs3_reg_inode_header_2 *inodep = &id.reg;
+ struct squashfs3_reg_inode_header_2 *sinodep = &sid.reg;
+ long long frag_blk;
+ unsigned int frag_size = 0;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ frag_blk = SQUASHFS3_INVALID_BLK;
+ if (inodep->fragment != SQUASHFS3_INVALID_FRAG &&
+ !get_fragment_location_2(s,
+ inodep->fragment, &frag_blk, &frag_size))
+ goto failed_read;
+
+ i->i_size = inodep->file_size;
+ i->i_fop = &generic_ro_fops;
+ i->i_mode |= S_IFREG;
+ i->i_mtime.tv_sec = inodep->mtime;
+ i->i_atime.tv_sec = inodep->mtime;
+ i->i_ctime.tv_sec = inodep->mtime;
+ i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+ SQUASHFS3_I(i)->u.s1.fragment_start_block = frag_blk;
+ SQUASHFS3_I(i)->u.s1.fragment_size = frag_size;
+ SQUASHFS3_I(i)->u.s1.fragment_offset = inodep->offset;
+ SQUASHFS3_I(i)->start_block = inodep->start_block;
+ SQUASHFS3_I(i)->u.s1.block_list_start = next_block;
+ SQUASHFS3_I(i)->offset = next_offset;
+ i->i_data.a_ops = &squashfs3_aops;
+
+ TRACE("File inode %x:%x, start_block %x, "
+ "block_list_start %llx, offset %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ inodep->start_block, next_block,
+ next_offset);
+ break;
+ }
+ case SQUASHFS3_DIR_TYPE: {
+ struct squashfs3_dir_inode_header_2 *inodep = &id.dir;
+ struct squashfs3_dir_inode_header_2 *sinodep = &sid.dir;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs3_dir_inode_ops_2;
+ i->i_fop = &squashfs3_dir_ops_2;
+ i->i_mode |= S_IFDIR;
+ i->i_mtime.tv_sec = inodep->mtime;
+ i->i_atime.tv_sec = inodep->mtime;
+ i->i_ctime.tv_sec = inodep->mtime;
+ SQUASHFS3_I(i)->start_block = inodep->start_block;
+ SQUASHFS3_I(i)->offset = inodep->offset;
+ SQUASHFS3_I(i)->u.s2.directory_index_count = 0;
+ SQUASHFS3_I(i)->u.s2.parent_inode = 0;
+
+ TRACE("Directory inode %x:%x, start_block %x, offset "
+ "%x\n", SQUASHFS3_INODE_BLK(inode),
+ offset, inodep->start_block,
+ inodep->offset);
+ break;
+ }
+ case SQUASHFS3_LDIR_TYPE: {
+ struct squashfs3_ldir_inode_header_2 *inodep = &id.ldir;
+ struct squashfs3_ldir_inode_header_2 *sinodep = &sid.ldir;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_LDIR_INODE_HEADER_2(inodep,
+ sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs3_dir_inode_ops_2;
+ i->i_fop = &squashfs3_dir_ops_2;
+ i->i_mode |= S_IFDIR;
+ i->i_mtime.tv_sec = inodep->mtime;
+ i->i_atime.tv_sec = inodep->mtime;
+ i->i_ctime.tv_sec = inodep->mtime;
+ SQUASHFS3_I(i)->start_block = inodep->start_block;
+ SQUASHFS3_I(i)->offset = inodep->offset;
+ SQUASHFS3_I(i)->u.s2.directory_index_start = next_block;
+ SQUASHFS3_I(i)->u.s2.directory_index_offset =
+ next_offset;
+ SQUASHFS3_I(i)->u.s2.directory_index_count =
+ inodep->i_count;
+ SQUASHFS3_I(i)->u.s2.parent_inode = 0;
+
+ TRACE("Long directory inode %x:%x, start_block %x, "
+ "offset %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ inodep->start_block, inodep->offset);
+ break;
+ }
+ case SQUASHFS3_SYMLINK_TYPE: {
+ struct squashfs3_symlink_inode_header_2 *inodep =
+ &id.symlink;
+ struct squashfs3_symlink_inode_header_2 *sinodep =
+ &sid.symlink;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_SYMLINK_INODE_HEADER_2(inodep,
+ sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ i->i_size = inodep->symlink_size;
+ i->i_op = &page_symlink_inode_operations;
+ i->i_data.a_ops = &squashfs3_symlink_aops;
+ i->i_mode |= S_IFLNK;
+ SQUASHFS3_I(i)->start_block = next_block;
+ SQUASHFS3_I(i)->offset = next_offset;
+
+ TRACE("Symbolic link inode %x:%x, start_block %llx, "
+ "offset %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ next_block, next_offset);
+ break;
+ }
+ case SQUASHFS3_BLKDEV_TYPE:
+ case SQUASHFS3_CHRDEV_TYPE: {
+ struct squashfs3_dev_inode_header_2 *inodep = &id.dev;
+ struct squashfs3_dev_inode_header_2 *sinodep = &sid.dev;
+
+ if (msblk->swap) {
+ if (!squashfs3_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS3_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
+ } else
+ if (!squashfs3_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ i->i_mode |= (inodeb->inode_type ==
+ SQUASHFS3_CHRDEV_TYPE) ? S_IFCHR :
+ S_IFBLK;
+ init_special_inode(i, i->i_mode,
+ old_decode_dev(inodep->rdev));
+
+ TRACE("Device inode %x:%x, rdev %x\n",
+ SQUASHFS3_INODE_BLK(inode), offset,
+ inodep->rdev);
+ break;
+ }
+ case SQUASHFS3_FIFO_TYPE:
+ case SQUASHFS3_SOCKET_TYPE: {
+
+ i->i_mode |= (inodeb->inode_type == SQUASHFS3_FIFO_TYPE)
+ ? S_IFIFO : S_IFSOCK;
+ init_special_inode(i, i->i_mode, 0);
+ break;
+ }
+ default:
+ ERROR("Unknown inode type %d in squashfs3_iget!\n",
+ inodeb->inode_type);
+ goto failed_read1;
+ }
+
+ return 1;
+
+failed_read:
+ ERROR("Unable to read inode [%x:%x]\n", block, offset);
+
+failed_read1:
+ return 0;
+}
+
+
+static int get_dir_index_using_offset(struct super_block *s, long long
+ *next_block, unsigned int *next_offset,
+ long long index_start,
+ unsigned int index_offset, int i_count,
+ long long f_pos)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ struct squashfs3_dir_index_2 index;
+
+ TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
+ i_count, (unsigned int) f_pos);
+
+ if (f_pos == 0)
+ goto finish;
+
+ for (i = 0; i < i_count; i++) {
+ if (msblk->swap) {
+ struct squashfs3_dir_index_2 sindex;
+ squashfs3_get_cached_block(s, (char *) &sindex,
+ index_start, index_offset,
+ sizeof(sindex), &index_start,
+ &index_offset);
+ SQUASHFS3_SWAP_DIR_INDEX_2(&index, &sindex);
+ } else
+ squashfs3_get_cached_block(s, (char *) &index,
+ index_start, index_offset,
+ sizeof(index), &index_start,
+ &index_offset);
+
+ if (index.index > f_pos)
+ break;
+
+ squashfs3_get_cached_block(s, NULL, index_start, index_offset,
+ index.size + 1, &index_start,
+ &index_offset);
+
+ length = index.index;
+ *next_block = index.start_block + sblk->directory_table_start;
+ }
+
+ *next_offset = (length + *next_offset) % SQUASHFS3_METADATA_SIZE;
+
+finish:
+ return length;
+}
+
+
+static int get_dir_index_using_name(struct super_block *s, long long
+ *next_block, unsigned int *next_offset,
+ long long index_start,
+ unsigned int index_offset, int i_count,
+ const char *name, int size)
+{
+ struct squashfs3_sb_info *msblk = s->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ struct squashfs3_dir_index_2 *index;
+ char *str;
+
+ TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+ if (!(str = kmalloc(sizeof(struct squashfs3_dir_index) +
+ (SQUASHFS3_NAME_LEN + 1) * 2, GFP_KERNEL))) {
+ ERROR("Failed to allocate squashfs3_dir_index\n");
+ goto failure;
+ }
+
+ index = (struct squashfs3_dir_index_2 *) (str + SQUASHFS3_NAME_LEN + 1);
+ strncpy(str, name, size);
+ str[size] = '\0';
+
+ for (i = 0; i < i_count; i++) {
+ if (msblk->swap) {
+ struct squashfs3_dir_index_2 sindex;
+ squashfs3_get_cached_block(s, (char *) &sindex,
+ index_start, index_offset,
+ sizeof(sindex), &index_start,
+ &index_offset);
+ SQUASHFS3_SWAP_DIR_INDEX_2(index, &sindex);
+ } else
+ squashfs3_get_cached_block(s, (char *) index,
+ index_start, index_offset,
+ sizeof(struct squashfs3_dir_index_2),
+ &index_start, &index_offset);
+
+ squashfs3_get_cached_block(s, index->name, index_start,
+ index_offset, index->size + 1,
+ &index_start, &index_offset);
+
+ index->name[index->size + 1] = '\0';
+
+ if (strcmp(index->name, str) > 0)
+ break;
+
+ length = index->index;
+ *next_block = index->start_block + sblk->directory_table_start;
+ }
+
+ *next_offset = (length + *next_offset) % SQUASHFS3_METADATA_SIZE;
+ kfree(str);
+failure:
+ return length;
+}
+
+
+static int squashfs3_readdir_2(struct file *file, struct dir_context *ctx)
+{
+ struct inode *i = file_inode(file);
+ struct squashfs3_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS3_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS3_I(i)->offset, length = 0,
+ dir_count;
+ struct squashfs3_dir_header_2 dirh;
+ struct squashfs3_dir_entry_2 *dire;
+
+ TRACE("Entered squashfs3_readdir_2 [%llx:%x]\n", next_block, next_offset);
+
+ if (!(dire = kmalloc(sizeof(struct squashfs3_dir_entry) +
+ SQUASHFS3_NAME_LEN + 1, GFP_KERNEL))) {
+ ERROR("Failed to allocate squashfs3_dir_entry\n");
+ goto finish;
+ }
+
+ length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_start,
+ SQUASHFS3_I(i)->u.s2.directory_index_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_count,
+ ctx->pos);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs3_dir_header_2 sdirh;
+
+ if (!squashfs3_get_cached_block(i->i_sb, (char *) &sdirh,
+ next_block, next_offset, sizeof(sdirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS3_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, (char *) &dirh,
+ next_block, next_offset, sizeof(dirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(dirh);
+ }
+
+ dir_count = dirh.count + 1;
+ while (dir_count--) {
+ if (msblk->swap) {
+ struct squashfs3_dir_entry_2 sdire;
+ if (!squashfs3_get_cached_block(i->i_sb, (char *)
+ &sdire, next_block, next_offset,
+ sizeof(sdire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS3_SWAP_DIR_ENTRY_2(dire, &sdire);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, (char *)
+ dire, next_block, next_offset,
+ sizeof(*dire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(*dire);
+ }
+
+ if (!squashfs3_get_cached_block(i->i_sb, dire->name,
+ next_block, next_offset,
+ dire->size + 1, &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += dire->size + 1;
+
+ if (ctx->pos >= length)
+ continue;
+
+ dire->name[dire->size + 1] = '\0';
+
+ TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
+ (unsigned int) ctx, dire->name,
+ dire->size + 1, (int) ctx->pos,
+ dirh.start_block, dire->offset,
+ squashfs3_filetype_table[dire->type]);
+
+ if (!dir_emit(ctx, dire->name, dire->size + 1,
+ SQUASHFS3_MK_VFS_INODE(
+ dirh.start_block, dire->offset),
+ squashfs3_filetype_table[dire->type])) {
+ TRACE("Filldir failed\n");
+ goto finish;
+ }
+ ctx->pos = length;
+ }
+ }
+
+finish:
+ kfree(dire);
+ return 0;
+
+failed_read:
+ ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+ next_offset);
+ kfree(dire);
+ return 0;
+}
+
+
+static struct dentry *squashfs3_lookup_2(struct inode *i, struct dentry *dentry,
+ unsigned int flags)
+{
+ const unsigned char *name = dentry->d_name.name;
+ int len = dentry->d_name.len;
+ struct inode *inode = NULL;
+ struct squashfs3_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS3_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS3_I(i)->offset, length = 0,
+ dir_count;
+ struct squashfs3_dir_header_2 dirh;
+ struct squashfs3_dir_entry_2 *dire;
+ int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
+
+ TRACE("Entered squashfs3_lookup_2 [%llx:%x]\n", next_block, next_offset);
+
+ if (!(dire = kmalloc(sizeof(struct squashfs3_dir_entry) +
+ SQUASHFS3_NAME_LEN + 1, GFP_KERNEL))) {
+ ERROR("Failed to allocate squashfs3_dir_entry\n");
+ goto exit_loop;
+ }
+
+ if (len > SQUASHFS3_NAME_LEN)
+ goto exit_loop;
+
+ length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_start,
+ SQUASHFS3_I(i)->u.s2.directory_index_offset,
+ SQUASHFS3_I(i)->u.s2.directory_index_count, name,
+ len);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs3_dir_header_2 sdirh;
+ if (!squashfs3_get_cached_block(i->i_sb, (char *) &sdirh,
+ next_block, next_offset, sizeof(sdirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS3_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, (char *) &dirh,
+ next_block, next_offset, sizeof(dirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(dirh);
+ }
+
+ dir_count = dirh.count + 1;
+ while (dir_count--) {
+ if (msblk->swap) {
+ struct squashfs3_dir_entry_2 sdire;
+ if (!squashfs3_get_cached_block(i->i_sb, (char *)
+ &sdire, next_block,next_offset,
+ sizeof(sdire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS3_SWAP_DIR_ENTRY_2(dire, &sdire);
+ } else {
+ if (!squashfs3_get_cached_block(i->i_sb, (char *)
+ dire, next_block,next_offset,
+ sizeof(*dire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(*dire);
+ }
+
+ if (!squashfs3_get_cached_block(i->i_sb, dire->name,
+ next_block, next_offset, dire->size + 1,
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += dire->size + 1;
+
+ if (sorted && name[0] < dire->name[0])
+ goto exit_loop;
+
+ if ((len == dire->size + 1) && !strncmp(name,
+ dire->name, len)) {
+ squashfs3_inode_t ino =
+ SQUASHFS3_MKINODE(dirh.start_block,
+ dire->offset);
+ unsigned int inode_number = SQUASHFS3_MK_VFS_INODE(dirh.start_block,
+ dire->offset);
+
+ TRACE("calling squashfs3_iget for directory "
+ "entry %s, inode %x:%x, %lld\n", name,
+ dirh.start_block, dire->offset, ino);
+
+ inode = squashfs3_iget(i->i_sb, ino, inode_number);
+
+ goto exit_loop;
+ }
+ }
+ }
+
+exit_loop:
+ kfree(dire);
+ d_add(dentry, inode);
+ return ERR_PTR(0);
+
+failed_read:
+ ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+ next_offset);
+ goto exit_loop;
+}
+
+
+int squashfs3_2_0_supported(struct squashfs3_sb_info *msblk)
+{
+ struct squashfs3_super_block *sblk = &msblk->sblk;
+
+ msblk->read_inode = squashfs3_read_inode_2;
+ msblk->read_fragment_index_table = read_fragment_index_table_2;
+
+ sblk->bytes_used = sblk->bytes_used_2;
+ sblk->uid_start = sblk->uid_start_2;
+ sblk->guid_start = sblk->guid_start_2;
+ sblk->inode_table_start = sblk->inode_table_start_2;
+ sblk->directory_table_start = sblk->directory_table_start_2;
+ sblk->fragment_table_start = sblk->fragment_table_start_2;
+
+ return 1;
+}
--- /dev/null
+++ b/fs/squashfs3/squashfs3.h
@@ -0,0 +1,81 @@
+/*
+ * Squashfs3 - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs3.h
+ */
+
+#ifdef CONFIG_SQUASHFS3_1_0_COMPATIBILITY
+#undef CONFIG_SQUASHFS3_1_0_COMPATIBILITY
+#endif
+
+#ifdef SQUASHFS3_TRACE
+#define TRACE(s, args...) printk(KERN_NOTICE "SQUASHFS3: "s, ## args)
+#else
+#define TRACE(s, args...) {}
+#endif
+
+#define ERROR(s, args...) printk(KERN_ERR "SQUASHFS3 error: "s, ## args)
+
+#define SERROR(s, args...) do { \
+ if (!silent) \
+ printk(KERN_ERR "SQUASHFS3 error: "s, ## args);\
+ } while(0)
+
+#define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS3: "s, ## args)
+
+static inline struct squashfs3_inode_info *SQUASHFS3_I(struct inode *inode)
+{
+ return list_entry(inode, struct squashfs3_inode_info, vfs_inode);
+}
+
+#if defined(CONFIG_SQUASHFS3_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS3_2_0_COMPATIBILITY)
+#define SQSH_EXTERN
+extern unsigned int squashfs3_read_data(struct super_block *s, char *buffer,
+ long long index, unsigned int length,
+ long long *next_index, int srclength);
+extern int squashfs3_get_cached_block(struct super_block *s, void *buffer,
+ long long block, unsigned int offset,
+ int length, long long *next_block,
+ unsigned int *next_offset);
+extern struct inode *squashfs3_iget(struct super_block *s, squashfs3_inode_t inode, unsigned int inode_number);
+extern const struct address_space_operations squashfs3_symlink_aops;
+extern const struct address_space_operations squashfs3_aops;
+extern struct inode_operations squashfs3_dir_inode_ops;
+#else
+#define SQSH_EXTERN static
+#endif
+
+#ifdef CONFIG_SQUASHFS3_1_0_COMPATIBILITY
+extern int squashfs3_1_0_supported(struct squashfs3_sb_info *msblk);
+#else
+static inline int squashfs3_1_0_supported(struct squashfs3_sb_info *msblk)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_SQUASHFS3_2_0_COMPATIBILITY
+extern int squashfs3_2_0_supported(struct squashfs3_sb_info *msblk);
+#else
+static inline int squashfs3_2_0_supported(struct squashfs3_sb_info *msblk)
+{
+ return 0;
+}
+#endif
--- /dev/null
+++ b/fs/squashfs3/squashfs3_fs.h
@@ -0,0 +1,934 @@
+#ifndef SQUASHFS3_FS
+#define SQUASHFS3_FS
+
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs3_fs.h
+ */
+
+#ifndef CONFIG_SQUASHFS3_2_0_COMPATIBILITY
+#define CONFIG_SQUASHFS3_2_0_COMPATIBILITY
+#endif
+
+#define SQUASHFS3_CACHED_FRAGMENTS CONFIG_SQUASHFS3_FRAGMENT_CACHE_SIZE
+#define SQUASHFS3_MAJOR 3
+#define SQUASHFS3_MINOR 1
+#define SQUASHFS3_MAGIC_SWAP 0x68737173
+#define SQUASHFS3_START 0
+
+/* size of metadata (inode and directory) blocks */
+#define SQUASHFS3_METADATA_SIZE 8192
+#define SQUASHFS3_METADATA_LOG 13
+
+/* default size of data blocks */
+#define SQUASHFS3_FILE_SIZE 131072
+#define SQUASHFS3_FILE_LOG 17
+
+#define SQUASHFS3_FILE_MAX_SIZE 1048576
+
+/* Max number of uids and gids */
+#define SQUASHFS3_UIDS 256
+#define SQUASHFS3_GUIDS 255
+
+/* Max length of filename (not 255) */
+#define SQUASHFS3_NAME_LEN 256
+
+#define SQUASHFS3_INVALID ((long long) 0xffffffffffff)
+#define SQUASHFS3_INVALID_FRAG ((unsigned int) 0xffffffff)
+#define SQUASHFS3_INVALID_BLK ((long long) -1)
+#define SQUASHFS3_USED_BLK ((long long) -2)
+
+/* Filesystem flags */
+#define SQUASHFS3_NOI 0
+#define SQUASHFS3_NOD 1
+#define SQUASHFS3_CHECK 2
+#define SQUASHFS3_NOF 3
+#define SQUASHFS3_NO_FRAG 4
+#define SQUASHFS3_ALWAYS_FRAG 5
+#define SQUASHFS3_DUPLICATE 6
+#define SQUASHFS3_EXPORT 7
+
+#define SQUASHFS3_BIT(flag, bit) ((flag >> bit) & 1)
+
+#define SQUASHFS3_UNCOMPRESSED_INODES(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_NOI)
+
+#define SQUASHFS3_UNCOMPRESSED_DATA(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_NOD)
+
+#define SQUASHFS3_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_NOF)
+
+#define SQUASHFS3_NO_FRAGMENTS(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_NO_FRAG)
+
+#define SQUASHFS3_ALWAYS_FRAGMENTS(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_ALWAYS_FRAG)
+
+#define SQUASHFS3_DUPLICATES(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_DUPLICATE)
+
+#define SQUASHFS3_EXPORTABLE(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_EXPORT)
+
+#define SQUASHFS3_CHECK_DATA(flags) SQUASHFS3_BIT(flags, \
+ SQUASHFS3_CHECK)
+
+#define SQUASHFS3_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
+ duplicate_checking, exportable) (noi | (nod << 1) | (check_data << 2) \
+ | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
+ (duplicate_checking << 6) | (exportable << 7))
+
+/* Max number of types and file types */
+#define SQUASHFS3_DIR_TYPE 1
+#define SQUASHFS3_FILE_TYPE 2
+#define SQUASHFS3_SYMLINK_TYPE 3
+#define SQUASHFS3_BLKDEV_TYPE 4
+#define SQUASHFS3_CHRDEV_TYPE 5
+#define SQUASHFS3_FIFO_TYPE 6
+#define SQUASHFS3_SOCKET_TYPE 7
+#define SQUASHFS3_LDIR_TYPE 8
+#define SQUASHFS3_LREG_TYPE 9
+
+/* 1.0 filesystem type definitions */
+#define SQUASHFS3_TYPES 5
+#define SQUASHFS3_IPC_TYPE 0
+
+/* Flag whether block is compressed or uncompressed, bit is set if block is
+ * uncompressed */
+#define SQUASHFS3_COMPRESSED_BIT (1 << 15)
+
+#define SQUASHFS3_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS3_COMPRESSED_BIT) ? \
+ (B) & ~SQUASHFS3_COMPRESSED_BIT : SQUASHFS3_COMPRESSED_BIT)
+
+#define SQUASHFS3_COMPRESSED(B) (!((B) & SQUASHFS3_COMPRESSED_BIT))
+
+#define SQUASHFS3_COMPRESSED_BIT_BLOCK (1 << 24)
+
+#define SQUASHFS3_COMPRESSED_SIZE_BLOCK(B) ((B) & \
+ ~SQUASHFS3_COMPRESSED_BIT_BLOCK)
+
+#define SQUASHFS3_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS3_COMPRESSED_BIT_BLOCK))
+
+/*
+ * Inode number ops. Inodes consist of a compressed block number, and an
+ * uncompressed offset within that block
+ */
+#define SQUASHFS3_INODE_BLK(a) ((unsigned int) ((a) >> 16))
+
+#define SQUASHFS3_INODE_OFFSET(a) ((unsigned int) ((a) & 0xffff))
+
+#define SQUASHFS3_MKINODE(A, B) ((squashfs3_inode_t)(((squashfs3_inode_t) (A)\
+ << 16) + (B)))
+
+/* Compute 32 bit VFS inode number from squashfs3 inode number */
+#define SQUASHFS3_MK_VFS_INODE(a, b) ((unsigned int) (((a) << 8) + \
+ ((b) >> 2) + 1))
+/* XXX */
+
+/* Translate between VFS mode and squashfs3 mode */
+#define SQUASHFS3_MODE(a) ((a) & 0xfff)
+
+/* fragment and fragment table defines */
+#define SQUASHFS3_FRAGMENT_BYTES(A) ((A) * sizeof(struct squashfs3_fragment_entry))
+
+#define SQUASHFS3_FRAGMENT_INDEX(A) (SQUASHFS3_FRAGMENT_BYTES(A) / \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS3_FRAGMENT_BYTES(A) % \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_FRAGMENT_INDEXES(A) ((SQUASHFS3_FRAGMENT_BYTES(A) + \
+ SQUASHFS3_METADATA_SIZE - 1) / \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_FRAGMENT_INDEX_BYTES(A) (SQUASHFS3_FRAGMENT_INDEXES(A) *\
+ sizeof(long long))
+
+/* inode lookup table defines */
+#define SQUASHFS3_LOOKUP_BYTES(A) ((A) * sizeof(squashfs3_inode_t))
+
+#define SQUASHFS3_LOOKUP_BLOCK(A) (SQUASHFS3_LOOKUP_BYTES(A) / \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS3_LOOKUP_BYTES(A) % \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_LOOKUP_BLOCKS(A) ((SQUASHFS3_LOOKUP_BYTES(A) + \
+ SQUASHFS3_METADATA_SIZE - 1) / \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_LOOKUP_BLOCK_BYTES(A) (SQUASHFS3_LOOKUP_BLOCKS(A) *\
+ sizeof(long long))
+
+/* cached data constants for filesystem */
+#define SQUASHFS3_CACHED_BLKS 8
+
+#define SQUASHFS3_MAX_FILE_SIZE_LOG 64
+
+#define SQUASHFS3_MAX_FILE_SIZE ((long long) 1 << \
+ (SQUASHFS3_MAX_FILE_SIZE_LOG - 2))
+
+#define SQUASHFS3_MARKER_BYTE 0xff
+
+/* meta index cache */
+#define SQUASHFS3_META_INDEXES (SQUASHFS3_METADATA_SIZE / sizeof(unsigned int))
+#define SQUASHFS3_META_ENTRIES 31
+#define SQUASHFS3_META_NUMBER 8
+#define SQUASHFS3_SLOTS 4
+
+struct squashfs3_meta_entry {
+ long long data_block;
+ unsigned int index_block;
+ unsigned short offset;
+ unsigned short pad;
+};
+
+struct squashfs3_meta_index {
+ unsigned int inode_number;
+ unsigned int offset;
+ unsigned short entries;
+ unsigned short skip;
+ unsigned short locked;
+ unsigned short pad;
+ struct squashfs3_meta_entry meta_entry[SQUASHFS3_META_ENTRIES];
+};
+
+
+/*
+ * definitions for structures on disk
+ */
+
+typedef long long squashfs3_block_t;
+typedef long long squashfs3_inode_t;
+
+struct squashfs3_super_block {
+ unsigned int s_magic;
+ unsigned int inodes;
+ unsigned int bytes_used_2;
+ unsigned int uid_start_2;
+ unsigned int guid_start_2;
+ unsigned int inode_table_start_2;
+ unsigned int directory_table_start_2;
+ unsigned int s_major:16;
+ unsigned int s_minor:16;
+ unsigned int block_size_1:16;
+ unsigned int block_log:16;
+ unsigned int flags:8;
+ unsigned int no_uids:8;
+ unsigned int no_guids:8;
+ unsigned int mkfs_time /* time of filesystem creation */;
+ squashfs3_inode_t root_inode;
+ unsigned int block_size;
+ unsigned int fragments;
+ unsigned int fragment_table_start_2;
+ long long bytes_used;
+ long long uid_start;
+ long long guid_start;
+ long long inode_table_start;
+ long long directory_table_start;
+ long long fragment_table_start;
+ long long lookup_table_start;
+} __attribute__ ((packed));
+
+struct squashfs3_dir_index {
+ unsigned int index;
+ unsigned int start_block;
+ unsigned char size;
+ unsigned char name[0];
+} __attribute__ ((packed));
+
+#define SQUASHFS3_BASE_INODE_HEADER \
+ unsigned int inode_type:4; \
+ unsigned int mode:12; \
+ unsigned int uid:8; \
+ unsigned int guid:8; \
+ unsigned int mtime; \
+ unsigned int inode_number;
+
+struct squashfs3_base_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+} __attribute__ ((packed));
+
+struct squashfs3_ipc_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+ unsigned int nlink;
+} __attribute__ ((packed));
+
+struct squashfs3_dev_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+ unsigned int nlink;
+ unsigned short rdev;
+} __attribute__ ((packed));
+
+struct squashfs3_symlink_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+ unsigned int nlink;
+ unsigned short symlink_size;
+ char symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs3_reg_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+ squashfs3_block_t start_block;
+ unsigned int fragment;
+ unsigned int offset;
+ unsigned int file_size;
+ unsigned short block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs3_lreg_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+ unsigned int nlink;
+ squashfs3_block_t start_block;
+ unsigned int fragment;
+ unsigned int offset;
+ long long file_size;
+ unsigned short block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs3_dir_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+ unsigned int nlink;
+ unsigned int file_size:19;
+ unsigned int offset:13;
+ unsigned int start_block;
+ unsigned int parent_inode;
+} __attribute__ ((packed));
+
+struct squashfs3_ldir_inode_header {
+ SQUASHFS3_BASE_INODE_HEADER;
+ unsigned int nlink;
+ unsigned int file_size:27;
+ unsigned int offset:13;
+ unsigned int start_block;
+ unsigned int i_count:16;
+ unsigned int parent_inode;
+ struct squashfs3_dir_index index[0];
+} __attribute__ ((packed));
+
+union squashfs3_inode_header {
+ struct squashfs3_base_inode_header base;
+ struct squashfs3_dev_inode_header dev;
+ struct squashfs3_symlink_inode_header symlink;
+ struct squashfs3_reg_inode_header reg;
+ struct squashfs3_lreg_inode_header lreg;
+ struct squashfs3_dir_inode_header dir;
+ struct squashfs3_ldir_inode_header ldir;
+ struct squashfs3_ipc_inode_header ipc;
+};
+
+struct squashfs3_dir_entry {
+ unsigned int offset:13;
+ unsigned int type:3;
+ unsigned int size:8;
+ int inode_number:16;
+ char name[0];
+} __attribute__ ((packed));
+
+struct squashfs3_dir_header {
+ unsigned int count:8;
+ unsigned int start_block;
+ unsigned int inode_number;
+} __attribute__ ((packed));
+
+struct squashfs3_fragment_entry {
+ long long start_block;
+ unsigned int size;
+ unsigned int unused;
+} __attribute__ ((packed));
+
+extern int squashfs3_uncompress_block(void *d, int dstlen, void *s, int srclen);
+extern int squashfs3_uncompress_init(void);
+extern int squashfs3_uncompress_exit(void);
+
+/*
+ * macros to convert each packed bitfield structure from little endian to big
+ * endian and vice versa. These are needed when creating or using a filesystem
+ * on a machine with different byte ordering to the target architecture.
+ *
+ */
+
+#define SQUASHFS3_SWAP_START \
+ int bits;\
+ int b_pos;\
+ unsigned long long val;\
+ unsigned char *s;\
+ unsigned char *d;
+
+#define SQUASHFS3_SWAP_SUPER_BLOCK(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_super_block));\
+ SQUASHFS3_SWAP((s)->s_magic, d, 0, 32);\
+ SQUASHFS3_SWAP((s)->inodes, d, 32, 32);\
+ SQUASHFS3_SWAP((s)->bytes_used_2, d, 64, 32);\
+ SQUASHFS3_SWAP((s)->uid_start_2, d, 96, 32);\
+ SQUASHFS3_SWAP((s)->guid_start_2, d, 128, 32);\
+ SQUASHFS3_SWAP((s)->inode_table_start_2, d, 160, 32);\
+ SQUASHFS3_SWAP((s)->directory_table_start_2, d, 192, 32);\
+ SQUASHFS3_SWAP((s)->s_major, d, 224, 16);\
+ SQUASHFS3_SWAP((s)->s_minor, d, 240, 16);\
+ SQUASHFS3_SWAP((s)->block_size_1, d, 256, 16);\
+ SQUASHFS3_SWAP((s)->block_log, d, 272, 16);\
+ SQUASHFS3_SWAP((s)->flags, d, 288, 8);\
+ SQUASHFS3_SWAP((s)->no_uids, d, 296, 8);\
+ SQUASHFS3_SWAP((s)->no_guids, d, 304, 8);\
+ SQUASHFS3_SWAP((s)->mkfs_time, d, 312, 32);\
+ SQUASHFS3_SWAP((s)->root_inode, d, 344, 64);\
+ SQUASHFS3_SWAP((s)->block_size, d, 408, 32);\
+ SQUASHFS3_SWAP((s)->fragments, d, 440, 32);\
+ SQUASHFS3_SWAP((s)->fragment_table_start_2, d, 472, 32);\
+ SQUASHFS3_SWAP((s)->bytes_used, d, 504, 64);\
+ SQUASHFS3_SWAP((s)->uid_start, d, 568, 64);\
+ SQUASHFS3_SWAP((s)->guid_start, d, 632, 64);\
+ SQUASHFS3_SWAP((s)->inode_table_start, d, 696, 64);\
+ SQUASHFS3_SWAP((s)->directory_table_start, d, 760, 64);\
+ SQUASHFS3_SWAP((s)->fragment_table_start, d, 824, 64);\
+ SQUASHFS3_SWAP((s)->lookup_table_start, d, 888, 64);\
+}
+
+#define SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, n)\
+ SQUASHFS3_MEMSET(s, d, n);\
+ SQUASHFS3_SWAP((s)->inode_type, d, 0, 4);\
+ SQUASHFS3_SWAP((s)->mode, d, 4, 12);\
+ SQUASHFS3_SWAP((s)->uid, d, 16, 8);\
+ SQUASHFS3_SWAP((s)->guid, d, 24, 8);\
+ SQUASHFS3_SWAP((s)->mtime, d, 32, 32);\
+ SQUASHFS3_SWAP((s)->inode_number, d, 64, 32);
+
+#define SQUASHFS3_SWAP_BASE_INODE_HEADER(s, d, n) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, n)\
+}
+
+#define SQUASHFS3_SWAP_IPC_INODE_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs3_ipc_inode_header))\
+ SQUASHFS3_SWAP((s)->nlink, d, 96, 32);\
+}
+
+#define SQUASHFS3_SWAP_DEV_INODE_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs3_dev_inode_header)); \
+ SQUASHFS3_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS3_SWAP((s)->rdev, d, 128, 16);\
+}
+
+#define SQUASHFS3_SWAP_SYMLINK_INODE_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs3_symlink_inode_header));\
+ SQUASHFS3_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS3_SWAP((s)->symlink_size, d, 128, 16);\
+}
+
+#define SQUASHFS3_SWAP_REG_INODE_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs3_reg_inode_header));\
+ SQUASHFS3_SWAP((s)->start_block, d, 96, 64);\
+ SQUASHFS3_SWAP((s)->fragment, d, 160, 32);\
+ SQUASHFS3_SWAP((s)->offset, d, 192, 32);\
+ SQUASHFS3_SWAP((s)->file_size, d, 224, 32);\
+}
+
+#define SQUASHFS3_SWAP_LREG_INODE_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs3_lreg_inode_header));\
+ SQUASHFS3_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS3_SWAP((s)->start_block, d, 128, 64);\
+ SQUASHFS3_SWAP((s)->fragment, d, 192, 32);\
+ SQUASHFS3_SWAP((s)->offset, d, 224, 32);\
+ SQUASHFS3_SWAP((s)->file_size, d, 256, 64);\
+}
+
+#define SQUASHFS3_SWAP_DIR_INODE_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs3_dir_inode_header));\
+ SQUASHFS3_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS3_SWAP((s)->file_size, d, 128, 19);\
+ SQUASHFS3_SWAP((s)->offset, d, 147, 13);\
+ SQUASHFS3_SWAP((s)->start_block, d, 160, 32);\
+ SQUASHFS3_SWAP((s)->parent_inode, d, 192, 32);\
+}
+
+#define SQUASHFS3_SWAP_LDIR_INODE_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs3_ldir_inode_header));\
+ SQUASHFS3_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS3_SWAP((s)->file_size, d, 128, 27);\
+ SQUASHFS3_SWAP((s)->offset, d, 155, 13);\
+ SQUASHFS3_SWAP((s)->start_block, d, 168, 32);\
+ SQUASHFS3_SWAP((s)->i_count, d, 200, 16);\
+ SQUASHFS3_SWAP((s)->parent_inode, d, 216, 32);\
+}
+
+#define SQUASHFS3_SWAP_DIR_INDEX(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_dir_index));\
+ SQUASHFS3_SWAP((s)->index, d, 0, 32);\
+ SQUASHFS3_SWAP((s)->start_block, d, 32, 32);\
+ SQUASHFS3_SWAP((s)->size, d, 64, 8);\
+}
+
+#define SQUASHFS3_SWAP_DIR_HEADER(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_dir_header));\
+ SQUASHFS3_SWAP((s)->count, d, 0, 8);\
+ SQUASHFS3_SWAP((s)->start_block, d, 8, 32);\
+ SQUASHFS3_SWAP((s)->inode_number, d, 40, 32);\
+}
+
+#define SQUASHFS3_SWAP_DIR_ENTRY(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_dir_entry));\
+ SQUASHFS3_SWAP((s)->offset, d, 0, 13);\
+ SQUASHFS3_SWAP((s)->type, d, 13, 3);\
+ SQUASHFS3_SWAP((s)->size, d, 16, 8);\
+ SQUASHFS3_SWAP((s)->inode_number, d, 24, 16);\
+}
+
+#define SQUASHFS3_SWAP_FRAGMENT_ENTRY(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_fragment_entry));\
+ SQUASHFS3_SWAP((s)->start_block, d, 0, 64);\
+ SQUASHFS3_SWAP((s)->size, d, 64, 32);\
+}
+
+#define SQUASHFS3_SWAP_INODE_T(s, d) SQUASHFS3_SWAP_LONG_LONGS(s, d, 1)
+
+#define SQUASHFS3_SWAP_SHORTS(s, d, n) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, n * 2);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ 16)\
+ SQUASHFS3_SWAP(s[entry], d, bit_position, 16);\
+}
+
+#define SQUASHFS3_SWAP_INTS(s, d, n) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, n * 4);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ 32)\
+ SQUASHFS3_SWAP(s[entry], d, bit_position, 32);\
+}
+
+#define SQUASHFS3_SWAP_LONG_LONGS(s, d, n) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, n * 8);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ 64)\
+ SQUASHFS3_SWAP(s[entry], d, bit_position, 64);\
+}
+
+#define SQUASHFS3_SWAP_DATA(s, d, n, bits) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, n * bits / 8);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ bits)\
+ SQUASHFS3_SWAP(s[entry], d, bit_position, bits);\
+}
+
+#define SQUASHFS3_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS3_SWAP_LONG_LONGS(s, d, n)
+#define SQUASHFS3_SWAP_LOOKUP_BLOCKS(s, d, n) SQUASHFS3_SWAP_LONG_LONGS(s, d, n)
+
+#ifdef CONFIG_SQUASHFS3_1_0_COMPATIBILITY
+
+struct squashfs3_base_inode_header_1 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:4; /* index into uid table */
+ unsigned int guid:4; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs3_ipc_inode_header_1 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:4; /* index into uid table */
+ unsigned int guid:4; /* index into guid table */
+ unsigned int type:4;
+ unsigned int offset:4;
+} __attribute__ ((packed));
+
+struct squashfs3_dev_inode_header_1 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:4; /* index into uid table */
+ unsigned int guid:4; /* index into guid table */
+ unsigned short rdev;
+} __attribute__ ((packed));
+
+struct squashfs3_symlink_inode_header_1 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:4; /* index into uid table */
+ unsigned int guid:4; /* index into guid table */
+ unsigned short symlink_size;
+ char symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs3_reg_inode_header_1 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:4; /* index into uid table */
+ unsigned int guid:4; /* index into guid table */
+ unsigned int mtime;
+ unsigned int start_block;
+ unsigned int file_size:32;
+ unsigned short block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs3_dir_inode_header_1 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:4; /* index into uid table */
+ unsigned int guid:4; /* index into guid table */
+ unsigned int file_size:19;
+ unsigned int offset:13;
+ unsigned int mtime;
+ unsigned int start_block:24;
+} __attribute__ ((packed));
+
+union squashfs3_inode_header_1 {
+ struct squashfs3_base_inode_header_1 base;
+ struct squashfs3_dev_inode_header_1 dev;
+ struct squashfs3_symlink_inode_header_1 symlink;
+ struct squashfs3_reg_inode_header_1 reg;
+ struct squashfs3_dir_inode_header_1 dir;
+ struct squashfs3_ipc_inode_header_1 ipc;
+};
+
+#define SQUASHFS3_SWAP_BASE_INODE_CORE_1(s, d, n) \
+ SQUASHFS3_MEMSET(s, d, n);\
+ SQUASHFS3_SWAP((s)->inode_type, d, 0, 4);\
+ SQUASHFS3_SWAP((s)->mode, d, 4, 12);\
+ SQUASHFS3_SWAP((s)->uid, d, 16, 4);\
+ SQUASHFS3_SWAP((s)->guid, d, 20, 4);
+
+#define SQUASHFS3_SWAP_BASE_INODE_HEADER_1(s, d, n) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_1(s, d, n)\
+}
+
+#define SQUASHFS3_SWAP_IPC_INODE_HEADER_1(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs3_ipc_inode_header_1));\
+ SQUASHFS3_SWAP((s)->type, d, 24, 4);\
+ SQUASHFS3_SWAP((s)->offset, d, 28, 4);\
+}
+
+#define SQUASHFS3_SWAP_DEV_INODE_HEADER_1(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs3_dev_inode_header_1));\
+ SQUASHFS3_SWAP((s)->rdev, d, 24, 16);\
+}
+
+#define SQUASHFS3_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs3_symlink_inode_header_1));\
+ SQUASHFS3_SWAP((s)->symlink_size, d, 24, 16);\
+}
+
+#define SQUASHFS3_SWAP_REG_INODE_HEADER_1(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs3_reg_inode_header_1));\
+ SQUASHFS3_SWAP((s)->mtime, d, 24, 32);\
+ SQUASHFS3_SWAP((s)->start_block, d, 56, 32);\
+ SQUASHFS3_SWAP((s)->file_size, d, 88, 32);\
+}
+
+#define SQUASHFS3_SWAP_DIR_INODE_HEADER_1(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs3_dir_inode_header_1));\
+ SQUASHFS3_SWAP((s)->file_size, d, 24, 19);\
+ SQUASHFS3_SWAP((s)->offset, d, 43, 13);\
+ SQUASHFS3_SWAP((s)->mtime, d, 56, 32);\
+ SQUASHFS3_SWAP((s)->start_block, d, 88, 24);\
+}
+
+#endif
+
+#ifdef CONFIG_SQUASHFS3_2_0_COMPATIBILITY
+
+struct squashfs3_dir_index_2 {
+ unsigned int index:27;
+ unsigned int start_block:29;
+ unsigned char size;
+ unsigned char name[0];
+} __attribute__ ((packed));
+
+struct squashfs3_base_inode_header_2 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:8; /* index into uid table */
+ unsigned int guid:8; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs3_ipc_inode_header_2 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:8; /* index into uid table */
+ unsigned int guid:8; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs3_dev_inode_header_2 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:8; /* index into uid table */
+ unsigned int guid:8; /* index into guid table */
+ unsigned short rdev;
+} __attribute__ ((packed));
+
+struct squashfs3_symlink_inode_header_2 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:8; /* index into uid table */
+ unsigned int guid:8; /* index into guid table */
+ unsigned short symlink_size;
+ char symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs3_reg_inode_header_2 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:8; /* index into uid table */
+ unsigned int guid:8; /* index into guid table */
+ unsigned int mtime;
+ unsigned int start_block;
+ unsigned int fragment;
+ unsigned int offset;
+ unsigned int file_size:32;
+ unsigned short block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs3_dir_inode_header_2 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:8; /* index into uid table */
+ unsigned int guid:8; /* index into guid table */
+ unsigned int file_size:19;
+ unsigned int offset:13;
+ unsigned int mtime;
+ unsigned int start_block:24;
+} __attribute__ ((packed));
+
+struct squashfs3_ldir_inode_header_2 {
+ unsigned int inode_type:4;
+ unsigned int mode:12; /* protection */
+ unsigned int uid:8; /* index into uid table */
+ unsigned int guid:8; /* index into guid table */
+ unsigned int file_size:27;
+ unsigned int offset:13;
+ unsigned int mtime;
+ unsigned int start_block:24;
+ unsigned int i_count:16;
+ struct squashfs3_dir_index_2 index[0];
+} __attribute__ ((packed));
+
+union squashfs3_inode_header_2 {
+ struct squashfs3_base_inode_header_2 base;
+ struct squashfs3_dev_inode_header_2 dev;
+ struct squashfs3_symlink_inode_header_2 symlink;
+ struct squashfs3_reg_inode_header_2 reg;
+ struct squashfs3_dir_inode_header_2 dir;
+ struct squashfs3_ldir_inode_header_2 ldir;
+ struct squashfs3_ipc_inode_header_2 ipc;
+};
+
+struct squashfs3_dir_header_2 {
+ unsigned int count:8;
+ unsigned int start_block:24;
+} __attribute__ ((packed));
+
+struct squashfs3_dir_entry_2 {
+ unsigned int offset:13;
+ unsigned int type:3;
+ unsigned int size:8;
+ char name[0];
+} __attribute__ ((packed));
+
+struct squashfs3_fragment_entry_2 {
+ unsigned int start_block;
+ unsigned int size;
+} __attribute__ ((packed));
+
+#define SQUASHFS3_SWAP_BASE_INODE_CORE_2(s, d, n)\
+ SQUASHFS3_MEMSET(s, d, n);\
+ SQUASHFS3_SWAP((s)->inode_type, d, 0, 4);\
+ SQUASHFS3_SWAP((s)->mode, d, 4, 12);\
+ SQUASHFS3_SWAP((s)->uid, d, 16, 8);\
+ SQUASHFS3_SWAP((s)->guid, d, 24, 8);\
+
+#define SQUASHFS3_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_2(s, d, n)\
+}
+
+#define SQUASHFS3_SWAP_IPC_INODE_HEADER_2(s, d) \
+ SQUASHFS3_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs3_ipc_inode_header_2))
+
+#define SQUASHFS3_SWAP_DEV_INODE_HEADER_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs3_dev_inode_header_2)); \
+ SQUASHFS3_SWAP((s)->rdev, d, 32, 16);\
+}
+
+#define SQUASHFS3_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs3_symlink_inode_header_2));\
+ SQUASHFS3_SWAP((s)->symlink_size, d, 32, 16);\
+}
+
+#define SQUASHFS3_SWAP_REG_INODE_HEADER_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs3_reg_inode_header_2));\
+ SQUASHFS3_SWAP((s)->mtime, d, 32, 32);\
+ SQUASHFS3_SWAP((s)->start_block, d, 64, 32);\
+ SQUASHFS3_SWAP((s)->fragment, d, 96, 32);\
+ SQUASHFS3_SWAP((s)->offset, d, 128, 32);\
+ SQUASHFS3_SWAP((s)->file_size, d, 160, 32);\
+}
+
+#define SQUASHFS3_SWAP_DIR_INODE_HEADER_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs3_dir_inode_header_2));\
+ SQUASHFS3_SWAP((s)->file_size, d, 32, 19);\
+ SQUASHFS3_SWAP((s)->offset, d, 51, 13);\
+ SQUASHFS3_SWAP((s)->mtime, d, 64, 32);\
+ SQUASHFS3_SWAP((s)->start_block, d, 96, 24);\
+}
+
+#define SQUASHFS3_SWAP_LDIR_INODE_HEADER_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs3_ldir_inode_header_2));\
+ SQUASHFS3_SWAP((s)->file_size, d, 32, 27);\
+ SQUASHFS3_SWAP((s)->offset, d, 59, 13);\
+ SQUASHFS3_SWAP((s)->mtime, d, 72, 32);\
+ SQUASHFS3_SWAP((s)->start_block, d, 104, 24);\
+ SQUASHFS3_SWAP((s)->i_count, d, 128, 16);\
+}
+
+#define SQUASHFS3_SWAP_DIR_INDEX_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_dir_index_2));\
+ SQUASHFS3_SWAP((s)->index, d, 0, 27);\
+ SQUASHFS3_SWAP((s)->start_block, d, 27, 29);\
+ SQUASHFS3_SWAP((s)->size, d, 56, 8);\
+}
+#define SQUASHFS3_SWAP_DIR_HEADER_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_dir_header_2));\
+ SQUASHFS3_SWAP((s)->count, d, 0, 8);\
+ SQUASHFS3_SWAP((s)->start_block, d, 8, 24);\
+}
+
+#define SQUASHFS3_SWAP_DIR_ENTRY_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_dir_entry_2));\
+ SQUASHFS3_SWAP((s)->offset, d, 0, 13);\
+ SQUASHFS3_SWAP((s)->type, d, 13, 3);\
+ SQUASHFS3_SWAP((s)->size, d, 16, 8);\
+}
+
+#define SQUASHFS3_SWAP_FRAGMENT_ENTRY_2(s, d) {\
+ SQUASHFS3_SWAP_START\
+ SQUASHFS3_MEMSET(s, d, sizeof(struct squashfs3_fragment_entry_2));\
+ SQUASHFS3_SWAP((s)->start_block, d, 0, 32);\
+ SQUASHFS3_SWAP((s)->size, d, 32, 32);\
+}
+
+#define SQUASHFS3_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS3_SWAP_INTS(s, d, n)
+
+/* fragment and fragment table defines */
+#define SQUASHFS3_FRAGMENT_BYTES_2(A) (A * sizeof(struct squashfs3_fragment_entry_2))
+
+#define SQUASHFS3_FRAGMENT_INDEX_2(A) (SQUASHFS3_FRAGMENT_BYTES_2(A) / \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_FRAGMENT_INDEX_OFFSET_2(A) (SQUASHFS3_FRAGMENT_BYTES_2(A) % \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_FRAGMENT_INDEXES_2(A) ((SQUASHFS3_FRAGMENT_BYTES_2(A) + \
+ SQUASHFS3_METADATA_SIZE - 1) / \
+ SQUASHFS3_METADATA_SIZE)
+
+#define SQUASHFS3_FRAGMENT_INDEX_BYTES_2(A) (SQUASHFS3_FRAGMENT_INDEXES_2(A) *\
+ sizeof(int))
+
+#endif
+
+#ifdef __KERNEL__
+
+/*
+ * macros used to swap each structure entry, taking into account
+ * bitfields and different bitfield placing conventions on differing
+ * architectures
+ */
+
+#include <asm/byteorder.h>
+
+#ifdef __BIG_ENDIAN
+ /* convert from little endian to big endian */
+#define SQUASHFS3_SWAP(value, p, pos, tbits) _SQUASHFS3_SWAP(value, p, pos, \
+ tbits, b_pos)
+#else
+ /* convert from big endian to little endian */
+#define SQUASHFS3_SWAP(value, p, pos, tbits) _SQUASHFS3_SWAP(value, p, pos, \
+ tbits, 64 - tbits - b_pos)
+#endif
+
+#define _SQUASHFS3_SWAP(value, p, pos, tbits, SHIFT) {\
+ b_pos = pos % 8;\
+ val = 0;\
+ s = (unsigned char *)p + (pos / 8);\
+ d = ((unsigned char *) &val) + 7;\
+ for(bits = 0; bits < (tbits + b_pos); bits += 8) \
+ *d-- = *s++;\
+ value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
+}
+
+#define SQUASHFS3_MEMSET(s, d, n) memset(s, 0, n);
+
+#endif
+#endif
--- /dev/null
+++ b/fs/squashfs3/squashfs3_fs_i.h
@@ -0,0 +1,45 @@
+#ifndef SQUASHFS3_FS_I
+#define SQUASHFS3_FS_I
+/*
+ * Squashfs3
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs3_fs_i.h
+ */
+
+struct squashfs3_inode_info {
+ long long start_block;
+ unsigned int offset;
+ union {
+ struct {
+ long long fragment_start_block;
+ unsigned int fragment_size;
+ unsigned int fragment_offset;
+ long long block_list_start;
+ } s1;
+ struct {
+ long long directory_index_start;
+ unsigned int directory_index_offset;
+ unsigned int directory_index_count;
+ unsigned int parent_inode;
+ } s2;
+ } u;
+ struct inode vfs_inode;
+};
+#endif
--- /dev/null
+++ b/fs/squashfs3/squashfs3_fs_sb.h
@@ -0,0 +1,79 @@
+#ifndef SQUASHFS3_FS_SB
+#define SQUASHFS3_FS_SB
+/*
+ * Squashfs3
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs3_fs_sb.h
+ */
+
+#include "squashfs3_fs.h"
+
+struct squashfs3_cache_entry {
+ long long block;
+ int length;
+ int locked;
+ long long next_index;
+ char pending;
+ char error;
+ int waiting;
+ wait_queue_head_t wait_queue;
+ char *data;
+};
+
+struct squashfs3_cache {
+ char *name;
+ int entries;
+ int block_size;
+ int next_blk;
+ int waiting;
+ int unused_blks;
+ int use_vmalloc;
+ spinlock_t lock;
+ wait_queue_head_t wait_queue;
+ struct squashfs3_cache_entry entry[0];
+};
+
+struct squashfs3_sb_info {
+ struct squashfs3_super_block sblk;
+ int devblksize;
+ int devblksize_log2;
+ int swap;
+ struct squashfs3_cache *block_cache;
+ struct squashfs3_cache *fragment_cache;
+ int next_meta_index;
+ unsigned int *uid;
+ unsigned int *guid;
+ long long *fragment_index;
+ unsigned int *fragment_index_2;
+ char *read_page;
+ struct mutex read_data_mutex;
+ struct mutex read_page_mutex;
+ struct mutex meta_index_mutex;
+ struct squashfs3_meta_index *meta_index;
+ z_stream stream;
+ long long *inode_lookup_table;
+ int (*read_inode)(struct inode *i, squashfs3_inode_t \
+ inode);
+ long long (*read_blocklist)(struct inode *inode, int \
+ index, int readahead_blks, char *block_list, \
+ unsigned short **block_p, unsigned int *bsize);
+ int (*read_fragment_index_table)(struct super_block *s);
+};
+#endif
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -20,6 +20,7 @@
#include "do_mounts.h"
#include "../fs/squashfs/squashfs_fs.h"
+#include "../fs/squashfs3/squashfs3_fs.h"
#include <linux/decompress/generic.h>
@@ -71,6 +72,7 @@ identify_ramdisk_image(int fd, int start
struct romfs_super_block *romfsb;
struct cramfs_super *cramfsb;
struct squashfs_super_block *squashfsb;
+ struct squashfs3_super_block *squashfs3sb;
int nblocks = -1;
unsigned char *buf;
const char *compress_name;
@@ -84,6 +86,7 @@ identify_ramdisk_image(int fd, int start
romfsb = (struct romfs_super_block *) buf;
cramfsb = (struct cramfs_super *) buf;
squashfsb = (struct squashfs_super_block *) buf;
+ squashfs3sb = (struct squashfs3_super_block *) buf;
memset(buf, 0xe5, size);
/*
@@ -123,7 +126,8 @@ identify_ramdisk_image(int fd, int start
}
/* squashfs is at block zero too */
- if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
+ if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC &&
+ le16_to_cpu(squashfsb->s_major) == SQUASHFS_MAJOR) {
printk(KERN_NOTICE
"RAMDISK: squashfs filesystem found at block %d\n",
start_block);
@@ -131,6 +135,17 @@ identify_ramdisk_image(int fd, int start
>> BLOCK_SIZE_BITS;
goto done;
}
+ if (squashfs3sb->s_magic == SQUASHFS_MAGIC &&
+ squashfs3sb->s_major <= 3) {
+ printk(KERN_NOTICE
+ "RAMDISK: squashfs3 filesystem found at block %d\n",
+ start_block);
+ if (squashfs3sb->s_major < 3)
+ nblocks = (squashfs3sb->bytes_used_2+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
+ else
+ nblocks = (squashfs3sb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
+ goto done;
+ }
/*
* Read 512 bytes further to check if cramfs is padded