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73471ac48a
openwrt-xburst/target/linux/etrax/patches/generic_2.6/001-squashfs.patch

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diff -urN linux-2.6.19.old/fs/Kconfig linux-2.6.19.dev/fs/Kconfig
--- linux-2.6.19.old/fs/Kconfig 2006-12-14 03:13:16.000000000 +0100
+++ linux-2.6.19.dev/fs/Kconfig 2006-12-14 03:13:16.000000000 +0100
@@ -1457,6 +1457,71 @@
If unsure, say N.
+config SQUASHFS
+ tristate "SquashFS 3.0 - Squashed file system support"
+ select ZLIB_INFLATE
+ help
+ Saying Y here includes support for SquashFS 3.0 (a Compressed Read-Only File
+ System). Squashfs is a highly compressed read-only 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 64K.
+ SquashFS 3.0 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 SQUASHFS_EMBEDDED
+
+ bool "Additional options for memory-constrained systems"
+ depends on SQUASHFS
+ default n
+ help
+ Saying Y here allows you to specify cache sizes and how Squashfs
+ allocates memory. This is only intended for memory constrained
+ systems.
+
+ If unsure, say N.
+
+config SQUASHFS_FRAGMENT_CACHE_SIZE
+ int "Number of fragments cached" if SQUASHFS_EMBEDDED
+ depends on SQUASHFS
+ 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.
+
+config SQUASHFS_VMALLOC
+ bool "Use Vmalloc rather than Kmalloc" if SQUASHFS_EMBEDDED
+ depends on SQUASHFS
+ default n
+ help
+ By default SquashFS uses kmalloc to obtain fragment cache memory.
+ Kmalloc memory is the standard kernel allocator, but it can fail
+ on memory constrained systems. Because of the way Vmalloc works,
+ Vmalloc can succeed when kmalloc fails. Specifying this option
+ will make SquashFS always use Vmalloc to allocate the
+ fragment cache memory.
+
+ If unsure, say N.
+
config VXFS_FS
tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
depends on BLOCK
diff -urN linux-2.6.19.old/fs/Makefile linux-2.6.19.dev/fs/Makefile
--- linux-2.6.19.old/fs/Makefile 2006-12-14 03:13:16.000000000 +0100
+++ linux-2.6.19.dev/fs/Makefile 2006-12-14 03:13:16.000000000 +0100
@@ -67,6 +67,7 @@
obj-$(CONFIG_JBD2) += jbd2/
obj-$(CONFIG_EXT2_FS) += ext2/
obj-$(CONFIG_CRAMFS) += cramfs/
+obj-$(CONFIG_SQUASHFS) += squashfs/
obj-$(CONFIG_RAMFS) += ramfs/
obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
obj-$(CONFIG_CODA_FS) += coda/
diff -urN linux-2.6.19.old/fs/squashfs/inode.c linux-2.6.19.dev/fs/squashfs/inode.c
--- linux-2.6.19.old/fs/squashfs/inode.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19.dev/fs/squashfs/inode.c 2006-12-14 03:13:16.000000000 +0100
@@ -0,0 +1,2124 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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/types.h>
+#include <linux/squashfs_fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/squashfs_fs_i.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/init.h>
+#include <linux/dcache.h>
+#include <linux/wait.h>
+#include <linux/zlib.h>
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+#include "squashfs.h"
+
+static void squashfs_put_super(struct super_block *);
+static int squashfs_statfs(struct dentry *, struct kstatfs *);
+static int squashfs_symlink_readpage(struct file *file, struct page *page);
+static int squashfs_readpage(struct file *file, struct page *page);
+static int squashfs_readpage4K(struct file *file, struct page *page);
+static int squashfs_readdir(struct file *, void *, filldir_t);
+static struct inode *squashfs_alloc_inode(struct super_block *sb);
+static void squashfs_destroy_inode(struct inode *inode);
+static int init_inodecache(void);
+static void destroy_inodecache(void);
+static struct dentry *squashfs_lookup(struct inode *, struct dentry *,
+ struct nameidata *);
+static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode);
+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 squashfs_get_sb(struct file_system_type *, int,
+ const char *, void *, struct vfsmount *);
+
+
+static z_stream stream;
+
+static struct file_system_type squashfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "squashfs",
+ .get_sb = squashfs_get_sb,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV
+};
+
+static unsigned char squashfs_filetype_table[] = {
+ DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
+};
+
+static struct super_operations squashfs_ops = {
+ .alloc_inode = squashfs_alloc_inode,
+ .destroy_inode = squashfs_destroy_inode,
+ .statfs = squashfs_statfs,
+ .put_super = squashfs_put_super,
+};
+
+SQSH_EXTERN struct address_space_operations squashfs_symlink_aops = {
+ .readpage = squashfs_symlink_readpage
+};
+
+SQSH_EXTERN struct address_space_operations squashfs_aops = {
+ .readpage = squashfs_readpage
+};
+
+SQSH_EXTERN struct address_space_operations squashfs_aops_4K = {
+ .readpage = squashfs_readpage4K
+};
+
+static struct file_operations squashfs_dir_ops = {
+ .read = generic_read_dir,
+ .readdir = squashfs_readdir
+};
+
+SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = {
+ .lookup = squashfs_lookup
+};
+
+
+static struct buffer_head *get_block_length(struct super_block *s,
+ int *cur_index, int *offset, int *c_byte)
+{
+ struct squashfs_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 (SQUASHFS_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)) !=
+ SQUASHFS_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 squashfs_read_data(struct super_block *s, char *buffer,
+ long long index, unsigned int length,
+ long long *next_index)
+{
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >>
+ msblk->devblksize_log2) + 2];
+ unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
+ unsigned int cur_index = index >> msblk->devblksize_log2;
+ int bytes, avail_bytes, b = 0, k;
+ char *c_buffer;
+ unsigned int compressed;
+ unsigned int c_byte = length;
+
+ if (c_byte) {
+ bytes = msblk->devblksize - offset;
+ compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
+ c_buffer = compressed ? msblk->read_data : buffer;
+ c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
+
+ TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
+ ? "" : "un", (unsigned int) c_byte);
+
+ if (!(bh[0] = sb_getblk(s, cur_index)))
+ goto block_release;
+
+ for (b = 1; bytes < c_byte; b++) {
+ if (!(bh[b] = sb_getblk(s, ++cur_index)))
+ goto block_release;
+ bytes += msblk->devblksize;
+ }
+ ll_rw_block(READ, b, bh);
+ } else {
+ if (!(bh[0] = get_block_length(s, &cur_index, &offset,
+ &c_byte)))
+ goto read_failure;
+
+ bytes = msblk->devblksize - offset;
+ compressed = SQUASHFS_COMPRESSED(c_byte);
+ c_buffer = compressed ? msblk->read_data : buffer;
+ c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
+
+ TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
+ ? "" : "un", (unsigned int) c_byte);
+
+ for (b = 1; bytes < c_byte; b++) {
+ if (!(bh[b] = sb_getblk(s, ++cur_index)))
+ goto block_release;
+ bytes += msblk->devblksize;
+ }
+ ll_rw_block(READ, b - 1, bh + 1);
+ }
+
+ if (compressed)
+ down(&msblk->read_data_mutex);
+
+ for (bytes = 0, k = 0; k < b; k++) {
+ avail_bytes = (c_byte - bytes) > (msblk->devblksize - offset) ?
+ msblk->devblksize - offset :
+ c_byte - bytes;
+ wait_on_buffer(bh[k]);
+ if (!buffer_uptodate(bh[k]))
+ goto block_release;
+ memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes);
+ bytes += avail_bytes;
+ offset = 0;
+ brelse(bh[k]);
+ }
+
+ /*
+ * uncompress block
+ */
+ if (compressed) {
+ int zlib_err;
+
+ stream.next_in = c_buffer;
+ stream.avail_in = c_byte;
+ stream.next_out = buffer;
+ stream.avail_out = msblk->read_size;
+
+ if (((zlib_err = zlib_inflateInit(&stream)) != Z_OK) ||
+ ((zlib_err = zlib_inflate(&stream, Z_FINISH))
+ != Z_STREAM_END) || ((zlib_err =
+ zlib_inflateEnd(&stream)) != Z_OK)) {
+ ERROR("zlib_fs returned unexpected result 0x%x\n",
+ zlib_err);
+ bytes = 0;
+ } else
+ bytes = stream.total_out;
+
+ up(&msblk->read_data_mutex);
+ }
+
+ if (next_index)
+ *next_index = index + c_byte + (length ? 0 :
+ (SQUASHFS_CHECK_DATA(msblk->sblk.flags)
+ ? 3 : 2));
+ return bytes;
+
+block_release:
+ while (--b >= 0)
+ brelse(bh[b]);
+
+read_failure:
+ ERROR("sb_bread failed reading block 0x%x\n", cur_index);
+ return 0;
+}
+
+
+SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer,
+ long long block, unsigned int offset,
+ int length, long long *next_block,
+ unsigned int *next_offset)
+{
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ int n, i, bytes, return_length = length;
+ long long next_index;
+
+ TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset);
+
+ while ( 1 ) {
+ for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
+ if (msblk->block_cache[i].block == block)
+ break;
+
+ down(&msblk->block_cache_mutex);
+
+ if (i == SQUASHFS_CACHED_BLKS) {
+ /* read inode header block */
+ for (i = msblk->next_cache, n = SQUASHFS_CACHED_BLKS;
+ n ; n --, i = (i + 1) %
+ SQUASHFS_CACHED_BLKS)
+ if (msblk->block_cache[i].block !=
+ SQUASHFS_USED_BLK)
+ break;
+
+ if (n == 0) {
+ wait_queue_t wait;
+
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&msblk->waitq, &wait);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ up(&msblk->block_cache_mutex);
+ schedule();
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&msblk->waitq, &wait);
+ continue;
+ }
+ msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
+
+ if (msblk->block_cache[i].block ==
+ SQUASHFS_INVALID_BLK) {
+ if (!(msblk->block_cache[i].data =
+ kmalloc(SQUASHFS_METADATA_SIZE,
+ GFP_KERNEL))) {
+ ERROR("Failed to allocate cache"
+ "block\n");
+ up(&msblk->block_cache_mutex);
+ goto out;
+ }
+ }
+
+ msblk->block_cache[i].block = SQUASHFS_USED_BLK;
+ up(&msblk->block_cache_mutex);
+
+ if (!(msblk->block_cache[i].length =
+ squashfs_read_data(s,
+ msblk->block_cache[i].data,
+ block, 0, &next_index))) {
+ ERROR("Unable to read cache block [%llx:%x]\n",
+ block, offset);
+ goto out;
+ }
+
+ down(&msblk->block_cache_mutex);
+ wake_up(&msblk->waitq);
+ msblk->block_cache[i].block = block;
+ msblk->block_cache[i].next_index = next_index;
+ TRACE("Read cache block [%llx:%x]\n", block, offset);
+ }
+
+ if (msblk->block_cache[i].block != block) {
+ up(&msblk->block_cache_mutex);
+ continue;
+ }
+
+ if ((bytes = msblk->block_cache[i].length - offset) >= length) {
+ if (buffer)
+ memcpy(buffer, msblk->block_cache[i].data +
+ offset, length);
+ if (msblk->block_cache[i].length - offset == length) {
+ *next_block = msblk->block_cache[i].next_index;
+ *next_offset = 0;
+ } else {
+ *next_block = block;
+ *next_offset = offset + length;
+ }
+ up(&msblk->block_cache_mutex);
+ goto finish;
+ } else {
+ if (buffer) {
+ memcpy(buffer, msblk->block_cache[i].data +
+ offset, bytes);
+ buffer += bytes;
+ }
+ block = msblk->block_cache[i].next_index;
+ up(&msblk->block_cache_mutex);
+ length -= bytes;
+ offset = 0;
+ }
+ }
+
+finish:
+ return return_length;
+out:
+ return 0;
+}
+
+
+static int get_fragment_location(struct super_block *s, unsigned int fragment,
+ long long *fragment_start_block,
+ unsigned int *fragment_size)
+{
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ long long start_block =
+ msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
+ int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
+ struct squashfs_fragment_entry fragment_entry;
+
+ if (msblk->swap) {
+ struct squashfs_fragment_entry sfragment_entry;
+
+ if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
+ start_block, offset,
+ sizeof(sfragment_entry), &start_block,
+ &offset))
+ goto out;
+ SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
+ } else
+ if (!squashfs_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;
+}
+
+
+SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct
+ squashfs_fragment_cache *fragment)
+{
+ down(&msblk->fragment_mutex);
+ fragment->locked --;
+ wake_up(&msblk->fragment_wait_queue);
+ up(&msblk->fragment_mutex);
+}
+
+
+SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block
+ *s, long long start_block,
+ int length)
+{
+ int i, n;
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+
+ while ( 1 ) {
+ down(&msblk->fragment_mutex);
+
+ for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS &&
+ msblk->fragment[i].block != start_block; i++);
+
+ if (i == SQUASHFS_CACHED_FRAGMENTS) {
+ for (i = msblk->next_fragment, n =
+ SQUASHFS_CACHED_FRAGMENTS; n &&
+ msblk->fragment[i].locked; n--, i = (i + 1) %
+ SQUASHFS_CACHED_FRAGMENTS);
+
+ if (n == 0) {
+ wait_queue_t wait;
+
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&msblk->fragment_wait_queue,
+ &wait);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ up(&msblk->fragment_mutex);
+ schedule();
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&msblk->fragment_wait_queue,
+ &wait);
+ continue;
+ }
+ msblk->next_fragment = (msblk->next_fragment + 1) %
+ SQUASHFS_CACHED_FRAGMENTS;
+
+ if (msblk->fragment[i].data == NULL)
+ if (!(msblk->fragment[i].data = SQUASHFS_ALLOC
+ (SQUASHFS_FILE_MAX_SIZE))) {
+ ERROR("Failed to allocate fragment "
+ "cache block\n");
+ up(&msblk->fragment_mutex);
+ goto out;
+ }
+
+ msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
+ msblk->fragment[i].locked = 1;
+ up(&msblk->fragment_mutex);
+
+ if (!(msblk->fragment[i].length = squashfs_read_data(s,
+ msblk->fragment[i].data,
+ start_block, length, NULL))) {
+ ERROR("Unable to read fragment cache block "
+ "[%llx]\n", start_block);
+ msblk->fragment[i].locked = 0;
+ goto out;
+ }
+
+ msblk->fragment[i].block = start_block;
+ TRACE("New fragment %d, start block %lld, locked %d\n",
+ i, msblk->fragment[i].block,
+ msblk->fragment[i].locked);
+ break;
+ }
+
+ msblk->fragment[i].locked++;
+ up(&msblk->fragment_mutex);
+ TRACE("Got fragment %d, start block %lld, locked %d\n", i,
+ msblk->fragment[i].block,
+ msblk->fragment[i].locked);
+ break;
+ }
+
+ return &msblk->fragment[i];
+
+out:
+ return NULL;
+}
+
+
+static struct inode *squashfs_new_inode(struct super_block *s,
+ struct squashfs_base_inode_header *inodeb)
+{
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ struct inode *i = new_inode(s);
+
+ if (i) {
+ 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 = msblk->uid[inodeb->uid];
+ i->i_mode = inodeb->mode;
+ i->i_size = 0;
+ if (inodeb->guid == SQUASHFS_GUIDS)
+ i->i_gid = i->i_uid;
+ else
+ i->i_gid = msblk->guid[inodeb->guid];
+ }
+
+ return i;
+}
+
+
+static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode)
+{
+ struct inode *i;
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ long long block = SQUASHFS_INODE_BLK(inode) +
+ sblk->inode_table_start;
+ unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
+ long long next_block;
+ unsigned int next_offset;
+ union squashfs_inode_header id, sid;
+ struct squashfs_base_inode_header *inodeb = &id.base,
+ *sinodeb = &sid.base;
+
+ TRACE("Entered squashfs_iget\n");
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
+ offset, sizeof(*sinodeb), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_BASE_INODE_HEADER(inodeb, sinodeb,
+ sizeof(*sinodeb));
+ } else
+ if (!squashfs_get_cached_block(s, (char *) inodeb, block,
+ offset, sizeof(*inodeb), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ switch(inodeb->inode_type) {
+ case SQUASHFS_FILE_TYPE: {
+ unsigned int frag_size;
+ long long frag_blk;
+ struct squashfs_reg_inode_header *inodep = &id.reg;
+ struct squashfs_reg_inode_header *sinodep = &sid.reg;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_REG_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ frag_blk = SQUASHFS_INVALID_BLK;
+ if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+ !get_fragment_location(s,
+ inodep->fragment, &frag_blk, &frag_size))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb)) == NULL)
+ goto failed_read1;
+
+ i->i_nlink = 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;
+ SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+ SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+ SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+ SQUASHFS_I(i)->start_block = inodep->start_block;
+ SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+ SQUASHFS_I(i)->offset = next_offset;
+ if (sblk->block_size > 4096)
+ i->i_data.a_ops = &squashfs_aops;
+ else
+ i->i_data.a_ops = &squashfs_aops_4K;
+
+ TRACE("File inode %x:%x, start_block %llx, "
+ "block_list_start %llx, offset %x\n",
+ SQUASHFS_INODE_BLK(inode), offset,
+ inodep->start_block, next_block,
+ next_offset);
+ break;
+ }
+ case SQUASHFS_LREG_TYPE: {
+ unsigned int frag_size;
+ long long frag_blk;
+ struct squashfs_lreg_inode_header *inodep = &id.lreg;
+ struct squashfs_lreg_inode_header *sinodep = &sid.lreg;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ frag_blk = SQUASHFS_INVALID_BLK;
+ if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+ !get_fragment_location(s,
+ inodep->fragment, &frag_blk, &frag_size))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb)) == NULL)
+ goto failed_read1;
+
+ i->i_nlink = 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;
+ SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+ SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+ SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+ SQUASHFS_I(i)->start_block = inodep->start_block;
+ SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+ SQUASHFS_I(i)->offset = next_offset;
+ if (sblk->block_size > 4096)
+ i->i_data.a_ops = &squashfs_aops;
+ else
+ i->i_data.a_ops = &squashfs_aops_4K;
+
+ TRACE("File inode %x:%x, start_block %llx, "
+ "block_list_start %llx, offset %x\n",
+ SQUASHFS_INODE_BLK(inode), offset,
+ inodep->start_block, next_block,
+ next_offset);
+ break;
+ }
+ case SQUASHFS_DIR_TYPE: {
+ struct squashfs_dir_inode_header *inodep = &id.dir;
+ struct squashfs_dir_inode_header *sinodep = &sid.dir;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_DIR_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb)) == NULL)
+ goto failed_read1;
+
+ i->i_nlink = inodep->nlink;
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs_dir_inode_ops;
+ i->i_fop = &squashfs_dir_ops;
+ i->i_mode |= S_IFDIR;
+ SQUASHFS_I(i)->start_block = inodep->start_block;
+ SQUASHFS_I(i)->offset = inodep->offset;
+ SQUASHFS_I(i)->u.s2.directory_index_count = 0;
+ SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+ TRACE("Directory inode %x:%x, start_block %x, offset "
+ "%x\n", SQUASHFS_INODE_BLK(inode),
+ offset, inodep->start_block,
+ inodep->offset);
+ break;
+ }
+ case SQUASHFS_LDIR_TYPE: {
+ struct squashfs_ldir_inode_header *inodep = &id.ldir;
+ struct squashfs_ldir_inode_header *sinodep = &sid.ldir;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep,
+ sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb)) == NULL)
+ goto failed_read1;
+
+ i->i_nlink = inodep->nlink;
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs_dir_inode_ops;
+ i->i_fop = &squashfs_dir_ops;
+ i->i_mode |= S_IFDIR;
+ SQUASHFS_I(i)->start_block = inodep->start_block;
+ SQUASHFS_I(i)->offset = inodep->offset;
+ SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
+ SQUASHFS_I(i)->u.s2.directory_index_offset =
+ next_offset;
+ SQUASHFS_I(i)->u.s2.directory_index_count =
+ inodep->i_count;
+ SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+ TRACE("Long directory inode %x:%x, start_block %x, "
+ "offset %x\n",
+ SQUASHFS_INODE_BLK(inode), offset,
+ inodep->start_block, inodep->offset);
+ break;
+ }
+ case SQUASHFS_SYMLINK_TYPE: {
+ struct squashfs_symlink_inode_header *inodep =
+ &id.symlink;
+ struct squashfs_symlink_inode_header *sinodep =
+ &sid.symlink;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep,
+ sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb)) == NULL)
+ goto failed_read1;
+
+ i->i_nlink = inodep->nlink;
+ i->i_size = inodep->symlink_size;
+ i->i_op = &page_symlink_inode_operations;
+ i->i_data.a_ops = &squashfs_symlink_aops;
+ i->i_mode |= S_IFLNK;
+ SQUASHFS_I(i)->start_block = next_block;
+ SQUASHFS_I(i)->offset = next_offset;
+
+ TRACE("Symbolic link inode %x:%x, start_block %llx, "
+ "offset %x\n",
+ SQUASHFS_INODE_BLK(inode), offset,
+ next_block, next_offset);
+ break;
+ }
+ case SQUASHFS_BLKDEV_TYPE:
+ case SQUASHFS_CHRDEV_TYPE: {
+ struct squashfs_dev_inode_header *inodep = &id.dev;
+ struct squashfs_dev_inode_header *sinodep = &sid.dev;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if ((i = squashfs_new_inode(s, inodeb)) == NULL)
+ goto failed_read1;
+
+ i->i_nlink = inodep->nlink;
+ i->i_mode |= (inodeb->inode_type ==
+ SQUASHFS_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",
+ SQUASHFS_INODE_BLK(inode), offset,
+ inodep->rdev);
+ break;
+ }
+ case SQUASHFS_FIFO_TYPE:
+ case SQUASHFS_SOCKET_TYPE: {
+ struct squashfs_ipc_inode_header *inodep = &id.ipc;
+ struct squashfs_ipc_inode_header *sinodep = &sid.ipc;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if ((i = squashfs_new_inode(s, inodeb)) == NULL)
+ goto failed_read1;
+
+ i->i_nlink = inodep->nlink;
+ i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
+ ? S_IFIFO : S_IFSOCK;
+ init_special_inode(i, i->i_mode, 0);
+ break;
+ }
+ default:
+ ERROR("Unknown inode type %d in squashfs_iget!\n",
+ inodeb->inode_type);
+ goto failed_read1;
+ }
+
+ insert_inode_hash(i);
+ return i;
+
+failed_read:
+ ERROR("Unable to read inode [%llx:%x]\n", block, offset);
+
+failed_read1:
+ return NULL;
+}
+
+
+static int read_fragment_index_table(struct super_block *s)
+{
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+
+ /* Allocate fragment index table */
+ if (!(msblk->fragment_index = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES
+ (sblk->fragments), GFP_KERNEL))) {
+ ERROR("Failed to allocate uid/gid table\n");
+ return 0;
+ }
+
+ if (SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments) &&
+ !squashfs_read_data(s, (char *)
+ msblk->fragment_index,
+ sblk->fragment_table_start,
+ SQUASHFS_FRAGMENT_INDEX_BYTES
+ (sblk->fragments) |
+ SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+ ERROR("unable to read fragment index table\n");
+ return 0;
+ }
+
+ if (msblk->swap) {
+ int i;
+ long long fragment;
+
+ for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments);
+ i++) {
+ SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment),
+ &msblk->fragment_index[i], 1);
+ msblk->fragment_index[i] = fragment;
+ }
+ }
+
+ return 1;
+}
+
+
+static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent)
+{
+ struct squashfs_super_block *sblk = &msblk->sblk;
+
+ msblk->iget = squashfs_iget;
+ msblk->read_blocklist = read_blocklist;
+ msblk->read_fragment_index_table = read_fragment_index_table;
+
+ if (sblk->s_major == 1) {
+ if (!squashfs_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 (!squashfs_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 != SQUASHFS_MAJOR || sblk->s_minor >
+ SQUASHFS_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 squashfs_fill_super(struct super_block *s, void *data, int silent)
+{
+ struct squashfs_sb_info *msblk;
+ struct squashfs_super_block *sblk;
+ int i;
+ char b[BDEVNAME_SIZE];
+ struct inode *root;
+
+ TRACE("Entered squashfs_read_superblock\n");
+
+ if (!(s->s_fs_info = kmalloc(sizeof(struct squashfs_sb_info),
+ GFP_KERNEL))) {
+ ERROR("Failed to allocate superblock\n");
+ goto failure;
+ }
+ memset(s->s_fs_info, 0, sizeof(struct squashfs_sb_info));
+ msblk = s->s_fs_info;
+ sblk = &msblk->sblk;
+
+ msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
+ msblk->devblksize_log2 = ffz(~msblk->devblksize);
+
+ init_MUTEX(&msblk->read_data_mutex);
+ init_MUTEX(&msblk->read_page_mutex);
+ init_MUTEX(&msblk->block_cache_mutex);
+ init_MUTEX(&msblk->fragment_mutex);
+ init_MUTEX(&msblk->meta_index_mutex);
+
+ init_waitqueue_head(&msblk->waitq);
+ init_waitqueue_head(&msblk->fragment_wait_queue);
+
+ if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START,
+ sizeof(struct squashfs_super_block) |
+ SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+ SERROR("unable to read superblock\n");
+ goto failed_mount;
+ }
+
+ /* Check it is a SQUASHFS superblock */
+ msblk->swap = 0;
+ if ((s->s_magic = sblk->s_magic) != SQUASHFS_MAGIC) {
+ if (sblk->s_magic == SQUASHFS_MAGIC_SWAP) {
+ struct squashfs_super_block ssblk;
+
+ WARNING("Mounting a different endian SQUASHFS "
+ "filesystem on %s\n", bdevname(s->s_bdev, b));
+
+ SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk);
+ memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block));
+ msblk->swap = 1;
+ } else {
+ SERROR("Can't find a SQUASHFS superblock on %s\n",
+ bdevname(s->s_bdev, b));
+ goto failed_mount;
+ }
+ }
+
+ /* Check the MAJOR & MINOR versions */
+ if(!supported_squashfs_filesystem(msblk, silent))
+ goto failed_mount;
+
+ TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b));
+ TRACE("Inodes are %scompressed\n",
+ SQUASHFS_UNCOMPRESSED_INODES
+ (sblk->flags) ? "un" : "");
+ TRACE("Data is %scompressed\n",
+ SQUASHFS_UNCOMPRESSED_DATA(sblk->flags)
+ ? "un" : "");
+ TRACE("Check data is %s present in the filesystem\n",
+ SQUASHFS_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_flags |= MS_RDONLY;
+ s->s_op = &squashfs_ops;
+
+ /* Init inode_table block pointer array */
+ if (!(msblk->block_cache = kmalloc(sizeof(struct squashfs_cache) *
+ SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
+ ERROR("Failed to allocate block cache\n");
+ goto failed_mount;
+ }
+
+ for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
+ msblk->block_cache[i].block = SQUASHFS_INVALID_BLK;
+
+ msblk->next_cache = 0;
+
+ /* Allocate read_data block */
+ msblk->read_size = (sblk->block_size < SQUASHFS_METADATA_SIZE) ?
+ SQUASHFS_METADATA_SIZE :
+ sblk->block_size;
+
+ if (!(msblk->read_data = kmalloc(msblk->read_size, GFP_KERNEL))) {
+ ERROR("Failed to allocate read_data block\n");
+ goto failed_mount;
+ }
+
+ /* Allocate read_page block */
+ if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) {
+ ERROR("Failed to allocate read_page block\n");
+ goto failed_mount;
+ }
+
+ /* Allocate uid and gid tables */
+ if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
+ sizeof(unsigned int), GFP_KERNEL))) {
+ 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 (!squashfs_read_data(s, (char *) &suid, sblk->uid_start,
+ ((sblk->no_uids + sblk->no_guids) *
+ sizeof(unsigned int)) |
+ SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+ ERROR("unable to read uid/gid table\n");
+ goto failed_mount;
+ }
+
+ SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
+ sblk->no_guids), (sizeof(unsigned int) * 8));
+ } else
+ if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start,
+ ((sblk->no_uids + sblk->no_guids) *
+ sizeof(unsigned int)) |
+ SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+ ERROR("unable to read uid/gid table\n");
+ goto failed_mount;
+ }
+
+
+ if (sblk->s_major == 1 && squashfs_1_0_supported(msblk))
+ goto allocate_root;
+
+ if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) *
+ SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
+ ERROR("Failed to allocate fragment block cache\n");
+ goto failed_mount;
+ }
+
+ for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
+ msblk->fragment[i].locked = 0;
+ msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
+ msblk->fragment[i].data = NULL;
+ }
+
+ msblk->next_fragment = 0;
+
+ /* Allocate fragment index table */
+ if (msblk->read_fragment_index_table(s) == 0)
+ goto failed_mount;
+
+allocate_root:
+ if ((root = (msblk->iget)(s, sblk->root_inode)) == NULL)
+ goto failed_mount;
+
+ if ((s->s_root = d_alloc_root(root)) == NULL) {
+ ERROR("Root inode create failed\n");
+ iput(root);
+ goto failed_mount;
+ }
+
+ TRACE("Leaving squashfs_read_super\n");
+ return 0;
+
+failed_mount:
+ kfree(msblk->fragment_index);
+ kfree(msblk->fragment);
+ kfree(msblk->uid);
+ kfree(msblk->read_page);
+ kfree(msblk->read_data);
+ kfree(msblk->block_cache);
+ kfree(msblk->fragment_index_2);
+ kfree(s->s_fs_info);
+ s->s_fs_info = NULL;
+ return -EINVAL;
+
+failure:
+ return -ENOMEM;
+}
+
+
+static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct squashfs_sb_info *msblk = dentry->d_inode->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+
+ TRACE("Entered squashfs_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 = SQUASHFS_NAME_LEN;
+
+ return 0;
+}
+
+
+static int squashfs_symlink_readpage(struct file *file, struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
+ long long block = SQUASHFS_I(inode)->start_block;
+ int offset = SQUASHFS_I(inode)->offset;
+ void *pageaddr = kmap(page);
+
+ TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
+ "%llx, offset %x\n", page->index,
+ SQUASHFS_I(inode)->start_block,
+ SQUASHFS_I(inode)->offset);
+
+ for (length = 0; length < index; length += bytes) {
+ if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL,
+ block, offset, PAGE_CACHE_SIZE, &block,
+ &offset))) {
+ ERROR("Unable to read symbolic link [%llx:%x]\n", block,
+ offset);
+ goto skip_read;
+ }
+ }
+
+ if (length != index) {
+ ERROR("(squashfs_symlink_readpage) length != index\n");
+ bytes = 0;
+ goto skip_read;
+ }
+
+ bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE :
+ i_size_read(inode) - length;
+
+ if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block,
+ offset, bytes, &block, &offset)))
+ ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
+
+skip_read:
+ memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+ kunmap(page);
+ SetPageUptodate(page);
+ unlock_page(page);
+
+ return 0;
+}
+
+
+struct meta_index *locate_meta_index(struct inode *inode, int index, int offset)
+{
+ struct meta_index *meta = NULL;
+ struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+ int i;
+
+ down(&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 < SQUASHFS_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:
+ up(&msblk->meta_index_mutex);
+
+ return meta;
+}
+
+
+struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
+{
+ struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+ struct meta_index *meta = NULL;
+ int i;
+
+ down(&msblk->meta_index_mutex);
+
+ TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
+
+ if(msblk->meta_index == NULL) {
+ if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) *
+ SQUASHFS_META_NUMBER, GFP_KERNEL))) {
+ ERROR("Failed to allocate meta_index\n");
+ goto failed;
+ }
+ for(i = 0; i < SQUASHFS_META_NUMBER; i++) {
+ msblk->meta_index[i].inode_number = 0;
+ msblk->meta_index[i].locked = 0;
+ }
+ msblk->next_meta_index = 0;
+ }
+
+ for(i = SQUASHFS_META_NUMBER; i &&
+ msblk->meta_index[msblk->next_meta_index].locked; i --)
+ msblk->next_meta_index = (msblk->next_meta_index + 1) %
+ SQUASHFS_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) %
+ SQUASHFS_META_NUMBER;
+
+ meta->inode_number = inode->i_ino;
+ meta->offset = offset;
+ meta->skip = skip;
+ meta->entries = 0;
+ meta->locked = 1;
+
+failed:
+ up(&msblk->meta_index_mutex);
+ return meta;
+}
+
+
+void release_meta_index(struct inode *inode, struct meta_index *meta)
+{
+ meta->locked = 0;
+}
+
+
+static int read_block_index(struct super_block *s, int blocks, char *block_list,
+ long long *start_block, int *offset)
+{
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ unsigned int *block_listp;
+ int block = 0;
+
+ if (msblk->swap) {
+ char sblock_list[blocks << 2];
+
+ if (!squashfs_get_cached_block(s, sblock_list, *start_block,
+ *offset, blocks << 2, start_block, offset)) {
+ ERROR("Unable to read block list [%llx:%x]\n",
+ *start_block, *offset);
+ goto failure;
+ }
+ SQUASHFS_SWAP_INTS(((unsigned int *)block_list),
+ ((unsigned int *)sblock_list), blocks);
+ } else
+ if (!squashfs_get_cached_block(s, block_list, *start_block,
+ *offset, blocks << 2, start_block, offset)) {
+ ERROR("Unable to read block list [%llx:%x]\n",
+ *start_block, *offset);
+ goto failure;
+ }
+
+ for (block_listp = (unsigned int *) block_list; blocks;
+ block_listp++, blocks --)
+ block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
+
+ return block;
+
+failure:
+ return -1;
+}
+
+
+#define SIZE 256
+
+static inline int calculate_skip(int blocks) {
+ int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_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 squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
+ int offset = 0;
+ struct meta_index *meta;
+ struct meta_entry *meta_entry;
+ long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start;
+ int cur_offset = SQUASHFS_I(inode)->offset;
+ long long cur_data_block = SQUASHFS_I(inode)->start_block;
+ int i;
+
+ index /= SQUASHFS_META_INDEXES * skip;
+
+ while ( offset < index ) {
+ meta = locate_meta_index(inode, index, offset + 1);
+
+ if (meta == NULL) {
+ if ((meta = empty_meta_index(inode, offset + 1,
+ skip)) == NULL)
+ goto all_done;
+ } else {
+ offset = index < meta->offset + meta->entries ? index :
+ meta->offset + meta->entries - 1;
+ 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 + SQUASHFS_META_ENTRIES; i++) {
+ int blocks = skip * SQUASHFS_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 * SQUASHFS_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 squashfs_readpage(struct file *file, struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ unsigned char block_list[SIZE];
+ long long block;
+ unsigned int bsize, i = 0, bytes = 0, byte_offset = 0;
+ int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT);
+ void *pageaddr;
+ struct squashfs_fragment_cache *fragment = NULL;
+ char *data_ptr = msblk->read_page;
+
+ int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1;
+ int start_index = page->index & ~mask;
+ int end_index = start_index | mask;
+
+ TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
+ page->index,
+ SQUASHFS_I(inode)->start_block);
+
+ if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
+ PAGE_CACHE_SHIFT))
+ goto skip_read;
+
+ if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+ || index < (i_size_read(inode) >>
+ sblk->block_log)) {
+ if ((block = (msblk->read_blocklist)(inode, index, 1,
+ block_list, NULL, &bsize)) == 0)
+ goto skip_read;
+
+ down(&msblk->read_page_mutex);
+
+ if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page,
+ block, bsize, NULL))) {
+ ERROR("Unable to read page, block %llx, size %x\n", block,
+ bsize);
+ up(&msblk->read_page_mutex);
+ goto skip_read;
+ }
+ } else {
+ if ((fragment = get_cached_fragment(inode->i_sb,
+ SQUASHFS_I(inode)->
+ u.s1.fragment_start_block,
+ SQUASHFS_I(inode)->u.s1.fragment_size))
+ == NULL) {
+ ERROR("Unable to read page, block %llx, size %x\n",
+ SQUASHFS_I(inode)->
+ u.s1.fragment_start_block,
+ (int) SQUASHFS_I(inode)->
+ u.s1.fragment_size);
+ goto skip_read;
+ }
+ bytes = SQUASHFS_I(inode)->u.s1.fragment_offset +
+ (i_size_read(inode) & (sblk->block_size
+ - 1));
+ byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
+ data_ptr = fragment->data;
+ }
+
+ for (i = start_index; i <= end_index && byte_offset < bytes;
+ i++, byte_offset += PAGE_CACHE_SIZE) {
+ struct page *push_page;
+ int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ?
+ PAGE_CACHE_SIZE : bytes - byte_offset;
+
+ TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n",
+ bytes, i, byte_offset, available_bytes);
+
+ if (i == page->index) {
+ pageaddr = kmap_atomic(page, KM_USER0);
+ memcpy(pageaddr, data_ptr + byte_offset,
+ available_bytes);
+ memset(pageaddr + available_bytes, 0,
+ PAGE_CACHE_SIZE - available_bytes);
+ kunmap_atomic(pageaddr, KM_USER0);
+ flush_dcache_page(page);
+ SetPageUptodate(page);
+ unlock_page(page);
+ } else if ((push_page =
+ grab_cache_page_nowait(page->mapping, i))) {
+ pageaddr = kmap_atomic(push_page, KM_USER0);
+
+ memcpy(pageaddr, data_ptr + byte_offset,
+ available_bytes);
+ memset(pageaddr + available_bytes, 0,
+ PAGE_CACHE_SIZE - available_bytes);
+ kunmap_atomic(pageaddr, KM_USER0);
+ flush_dcache_page(push_page);
+ SetPageUptodate(push_page);
+ unlock_page(push_page);
+ page_cache_release(push_page);
+ }
+ }
+
+ if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+ || index < (i_size_read(inode) >>
+ sblk->block_log))
+ up(&msblk->read_page_mutex);
+ else
+ release_cached_fragment(msblk, fragment);
+
+ return 0;
+
+skip_read:
+ pageaddr = kmap_atomic(page, KM_USER0);
+ memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+ kunmap_atomic(pageaddr, KM_USER0);
+ flush_dcache_page(page);
+ SetPageUptodate(page);
+ unlock_page(page);
+
+ return 0;
+}
+
+
+static int squashfs_readpage4K(struct file *file, struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ unsigned char block_list[SIZE];
+ long long block;
+ unsigned int bsize, bytes = 0;
+ void *pageaddr;
+
+ TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n",
+ page->index,
+ SQUASHFS_I(inode)->start_block);
+
+ if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
+ PAGE_CACHE_SHIFT)) {
+ pageaddr = kmap_atomic(page, KM_USER0);
+ goto skip_read;
+ }
+
+ if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+ || page->index < (i_size_read(inode) >>
+ sblk->block_log)) {
+ block = (msblk->read_blocklist)(inode, page->index, 1,
+ block_list, NULL, &bsize);
+
+ down(&msblk->read_page_mutex);
+ bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block,
+ bsize, NULL);
+ pageaddr = kmap_atomic(page, KM_USER0);
+ if (bytes)
+ memcpy(pageaddr, msblk->read_page, bytes);
+ else
+ ERROR("Unable to read page, block %llx, size %x\n",
+ block, bsize);
+ up(&msblk->read_page_mutex);
+ } else {
+ struct squashfs_fragment_cache *fragment =
+ get_cached_fragment(inode->i_sb,
+ SQUASHFS_I(inode)->
+ u.s1.fragment_start_block,
+ SQUASHFS_I(inode)-> u.s1.fragment_size);
+ pageaddr = kmap_atomic(page, KM_USER0);
+ if (fragment) {
+ bytes = i_size_read(inode) & (sblk->block_size - 1);
+ memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->
+ u.s1.fragment_offset, bytes);
+ release_cached_fragment(msblk, fragment);
+ } else
+ ERROR("Unable to read page, block %llx, size %x\n",
+ SQUASHFS_I(inode)->
+ u.s1.fragment_start_block, (int)
+ SQUASHFS_I(inode)-> u.s1.fragment_size);
+ }
+
+skip_read:
+ memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+ kunmap_atomic(pageaddr, KM_USER0);
+ flush_dcache_page(page);
+ SetPageUptodate(page);
+ unlock_page(page);
+
+ 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 squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ struct squashfs_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 squashfs_dir_index sindex;
+ squashfs_get_cached_block(s, (char *) &sindex,
+ index_start, index_offset,
+ sizeof(sindex), &index_start,
+ &index_offset);
+ SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
+ } else
+ squashfs_get_cached_block(s, (char *) &index,
+ index_start, index_offset,
+ sizeof(index), &index_start,
+ &index_offset);
+
+ if (index.index > f_pos)
+ break;
+
+ squashfs_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) % SQUASHFS_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 squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ char buffer[sizeof(struct squashfs_dir_index) + SQUASHFS_NAME_LEN + 1];
+ struct squashfs_dir_index *index = (struct squashfs_dir_index *) buffer;
+ char str[SQUASHFS_NAME_LEN + 1];
+
+ TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+ strncpy(str, name, size);
+ str[size] = '\0';
+
+ for (i = 0; i < i_count; i++) {
+ if (msblk->swap) {
+ struct squashfs_dir_index sindex;
+ squashfs_get_cached_block(s, (char *) &sindex,
+ index_start, index_offset,
+ sizeof(sindex), &index_start,
+ &index_offset);
+ SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
+ } else
+ squashfs_get_cached_block(s, (char *) index,
+ index_start, index_offset,
+ sizeof(struct squashfs_dir_index),
+ &index_start, &index_offset);
+
+ squashfs_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) % SQUASHFS_METADATA_SIZE;
+ return length + 3;
+}
+
+
+static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+ struct inode *i = file->f_dentry->d_inode;
+ struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
+ dir_count;
+ struct squashfs_dir_header dirh;
+ char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
+ struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
+
+ TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset);
+
+ while(file->f_pos < 3) {
+ char *name;
+ int size, i_ino;
+
+ if(file->f_pos == 0) {
+ name = ".";
+ size = 1;
+ i_ino = i->i_ino;
+ } else {
+ name = "..";
+ size = 2;
+ i_ino = SQUASHFS_I(i)->u.s2.parent_inode;
+ }
+ TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
+ (unsigned int) dirent, name, size, (int)
+ file->f_pos, i_ino,
+ squashfs_filetype_table[1]);
+
+ if (filldir(dirent, name, size,
+ file->f_pos, i_ino,
+ squashfs_filetype_table[1]) < 0) {
+ TRACE("Filldir returned less than 0\n");
+ goto finish;
+ }
+ file->f_pos += size;
+ dirs_read++;
+ }
+
+ length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_start,
+ SQUASHFS_I(i)->u.s2.directory_index_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_count,
+ file->f_pos);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs_dir_header sdirh;
+
+ if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+ next_block, next_offset, sizeof(sdirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+ } else {
+ if (!squashfs_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 squashfs_dir_entry sdire;
+ if (!squashfs_get_cached_block(i->i_sb, (char *)
+ &sdire, next_block, next_offset,
+ sizeof(sdire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+ } else {
+ if (!squashfs_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 (!squashfs_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 (file->f_pos >= length)
+ continue;
+
+ dire->name[dire->size + 1] = '\0';
+
+ TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
+ (unsigned int) dirent, dire->name,
+ dire->size + 1, (int) file->f_pos,
+ dirh.start_block, dire->offset,
+ dirh.inode_number + dire->inode_number,
+ squashfs_filetype_table[dire->type]);
+
+ if (filldir(dirent, dire->name, dire->size + 1,
+ file->f_pos,
+ dirh.inode_number + dire->inode_number,
+ squashfs_filetype_table[dire->type])
+ < 0) {
+ TRACE("Filldir returned less than 0\n");
+ goto finish;
+ }
+ file->f_pos = length;
+ dirs_read++;
+ }
+ }
+
+finish:
+ return dirs_read;
+
+failed_read:
+ ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+ next_offset);
+ return 0;
+}
+
+
+static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ const unsigned char *name = dentry->d_name.name;
+ int len = dentry->d_name.len;
+ struct inode *inode = NULL;
+ struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS_I(i)->offset, length = 0,
+ dir_count;
+ struct squashfs_dir_header dirh;
+ char buffer[sizeof(struct squashfs_dir_entry) + SQUASHFS_NAME_LEN];
+ struct squashfs_dir_entry *dire = (struct squashfs_dir_entry *) buffer;
+
+ TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
+
+ if (len > SQUASHFS_NAME_LEN)
+ goto exit_loop;
+
+ length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_start,
+ SQUASHFS_I(i)->u.s2.directory_index_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_count, name,
+ len);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs_dir_header sdirh;
+ if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+ next_block, next_offset, sizeof(sdirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+ } else {
+ if (!squashfs_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 squashfs_dir_entry sdire;
+ if (!squashfs_get_cached_block(i->i_sb, (char *)
+ &sdire, next_block,next_offset,
+ sizeof(sdire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+ } else {
+ if (!squashfs_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 (!squashfs_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_loop;
+
+ if ((len == dire->size + 1) && !strncmp(name,
+ dire->name, len)) {
+ squashfs_inode_t ino =
+ SQUASHFS_MKINODE(dirh.start_block,
+ dire->offset);
+
+ TRACE("calling squashfs_iget for directory "
+ "entry %s, inode %x:%x, %d\n", name,
+ dirh.start_block, dire->offset,
+ dirh.inode_number + dire->inode_number);
+
+ inode = (msblk->iget)(i->i_sb, ino);
+
+ goto exit_loop;
+ }
+ }
+ }
+
+exit_loop:
+ 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;
+}
+
+
+static void squashfs_put_super(struct super_block *s)
+{
+ int i;
+
+ if (s->s_fs_info) {
+ struct squashfs_sb_info *sbi = s->s_fs_info;
+ if (sbi->block_cache)
+ for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
+ if (sbi->block_cache[i].block !=
+ SQUASHFS_INVALID_BLK)
+ kfree(sbi->block_cache[i].data);
+ if (sbi->fragment)
+ for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++)
+ SQUASHFS_FREE(sbi->fragment[i].data);
+ kfree(sbi->fragment);
+ kfree(sbi->block_cache);
+ kfree(sbi->read_data);
+ kfree(sbi->read_page);
+ kfree(sbi->uid);
+ kfree(sbi->fragment_index);
+ kfree(sbi->fragment_index_2);
+ kfree(sbi->meta_index);
+ kfree(s->s_fs_info);
+ s->s_fs_info = NULL;
+ }
+}
+
+
+static int squashfs_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data,
+ struct vfsmount *mnt)
+{
+ return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super, mnt);
+}
+
+
+static int __init init_squashfs_fs(void)
+{
+ int err = init_inodecache();
+ if (err)
+ goto out;
+
+ printk(KERN_INFO "squashfs: version 3.0 (2006/03/15) "
+ "Phillip Lougher\n");
+
+ if (!(stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
+ ERROR("Failed to allocate zlib workspace\n");
+ destroy_inodecache();
+ err = -ENOMEM;
+ goto out;
+ }
+
+ if ((err = register_filesystem(&squashfs_fs_type))) {
+ vfree(stream.workspace);
+ destroy_inodecache();
+ }
+
+out:
+ return err;
+}
+
+
+static void __exit exit_squashfs_fs(void)
+{
+ vfree(stream.workspace);
+ unregister_filesystem(&squashfs_fs_type);
+ destroy_inodecache();
+}
+
+
+static kmem_cache_t * squashfs_inode_cachep;
+
+
+static struct inode *squashfs_alloc_inode(struct super_block *sb)
+{
+ struct squashfs_inode_info *ei;
+ ei = kmem_cache_alloc(squashfs_inode_cachep, SLAB_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+
+static void squashfs_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode));
+}
+
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+ struct squashfs_inode_info *ei = foo;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR)
+ inode_init_once(&ei->vfs_inode);
+}
+
+
+static int __init init_inodecache(void)
+{
+ squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache",
+ sizeof(struct squashfs_inode_info),
+ 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
+ init_once, NULL);
+ if (squashfs_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+
+static void destroy_inodecache(void)
+{
+ kmem_cache_destroy(squashfs_inode_cachep);
+}
+
+
+module_init(init_squashfs_fs);
+module_exit(exit_squashfs_fs);
+MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem");
+MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>");
+MODULE_LICENSE("GPL");
diff -urN linux-2.6.19.old/fs/squashfs/Makefile linux-2.6.19.dev/fs/squashfs/Makefile
--- linux-2.6.19.old/fs/squashfs/Makefile 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19.dev/fs/squashfs/Makefile 2006-12-14 03:13:16.000000000 +0100
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux squashfs routines.
+#
+
+obj-$(CONFIG_SQUASHFS) += squashfs.o
+squashfs-y += inode.o
+squashfs-y += squashfs2_0.o
diff -urN linux-2.6.19.old/fs/squashfs/squashfs2_0.c linux-2.6.19.dev/fs/squashfs/squashfs2_0.c
--- linux-2.6.19.old/fs/squashfs/squashfs2_0.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19.dev/fs/squashfs/squashfs2_0.c 2006-12-14 03:13:16.000000000 +0100
@@ -0,0 +1,758 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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/types.h>
+#include <linux/squashfs_fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/squashfs_fs_i.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/init.h>
+#include <linux/dcache.h>
+#include <linux/wait.h>
+#include <linux/zlib.h>
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+#include "squashfs.h"
+static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
+static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *,
+ struct nameidata *);
+
+static struct file_operations squashfs_dir_ops_2 = {
+ .read = generic_read_dir,
+ .readdir = squashfs_readdir_2
+};
+
+static struct inode_operations squashfs_dir_inode_ops_2 = {
+ .lookup = squashfs_lookup_2
+};
+
+static unsigned char squashfs_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 squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+
+ if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
+ (sblk->fragments), GFP_KERNEL))) {
+ ERROR("Failed to allocate uid/gid table\n");
+ return 0;
+ }
+
+ if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
+ !squashfs_read_data(s, (char *)
+ msblk->fragment_index_2,
+ sblk->fragment_table_start,
+ SQUASHFS_FRAGMENT_INDEX_BYTES_2
+ (sblk->fragments) |
+ SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+ ERROR("unable to read fragment index table\n");
+ return 0;
+ }
+
+ if (msblk->swap) {
+ int i;
+ unsigned int fragment;
+
+ for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
+ i++) {
+ SQUASHFS_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 squashfs_sb_info *msblk = s->s_fs_info;
+ long long start_block =
+ msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
+ int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
+ struct squashfs_fragment_entry_2 fragment_entry;
+
+ if (msblk->swap) {
+ struct squashfs_fragment_entry_2 sfragment_entry;
+
+ if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
+ start_block, offset,
+ sizeof(sfragment_entry), &start_block,
+ &offset))
+ goto out;
+ SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
+ } else
+ if (!squashfs_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 struct inode *squashfs_new_inode(struct super_block *s,
+ struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
+{
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ struct inode *i = new_inode(s);
+
+ if (i) {
+ 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 = msblk->uid[inodeb->uid];
+ i->i_mode = inodeb->mode;
+ i->i_nlink = 1;
+ i->i_size = 0;
+ if (inodeb->guid == SQUASHFS_GUIDS)
+ i->i_gid = i->i_uid;
+ else
+ i->i_gid = msblk->guid[inodeb->guid];
+ }
+
+ return i;
+}
+
+
+static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode)
+{
+ struct inode *i;
+ struct squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ unsigned int block = SQUASHFS_INODE_BLK(inode) +
+ sblk->inode_table_start;
+ unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
+ unsigned int ino = SQUASHFS_MK_VFS_INODE(block
+ - sblk->inode_table_start, offset);
+ long long next_block;
+ unsigned int next_offset;
+ union squashfs_inode_header_2 id, sid;
+ struct squashfs_base_inode_header_2 *inodeb = &id.base,
+ *sinodeb = &sid.base;
+
+ TRACE("Entered squashfs_iget\n");
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
+ offset, sizeof(*sinodeb), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
+ sizeof(*sinodeb));
+ } else
+ if (!squashfs_get_cached_block(s, (char *) inodeb, block,
+ offset, sizeof(*inodeb), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ switch(inodeb->inode_type) {
+ case SQUASHFS_FILE_TYPE: {
+ struct squashfs_reg_inode_header_2 *inodep = &id.reg;
+ struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
+ long long frag_blk;
+ unsigned int frag_size;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ frag_blk = SQUASHFS_INVALID_BLK;
+ if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+ !get_fragment_location_2(s,
+ inodep->fragment, &frag_blk, &frag_size))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+ goto failed_read1;
+
+ 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;
+ i->i_blksize = PAGE_CACHE_SIZE;
+ SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+ SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+ SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+ SQUASHFS_I(i)->start_block = inodep->start_block;
+ SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+ SQUASHFS_I(i)->offset = next_offset;
+ if (sblk->block_size > 4096)
+ i->i_data.a_ops = &squashfs_aops;
+ else
+ i->i_data.a_ops = &squashfs_aops_4K;
+
+ TRACE("File inode %x:%x, start_block %x, "
+ "block_list_start %llx, offset %x\n",
+ SQUASHFS_INODE_BLK(inode), offset,
+ inodep->start_block, next_block,
+ next_offset);
+ break;
+ }
+ case SQUASHFS_DIR_TYPE: {
+ struct squashfs_dir_inode_header_2 *inodep = &id.dir;
+ struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+ goto failed_read1;
+
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs_dir_inode_ops_2;
+ i->i_fop = &squashfs_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;
+ SQUASHFS_I(i)->start_block = inodep->start_block;
+ SQUASHFS_I(i)->offset = inodep->offset;
+ SQUASHFS_I(i)->u.s2.directory_index_count = 0;
+ SQUASHFS_I(i)->u.s2.parent_inode = 0;
+
+ TRACE("Directory inode %x:%x, start_block %x, offset "
+ "%x\n", SQUASHFS_INODE_BLK(inode),
+ offset, inodep->start_block,
+ inodep->offset);
+ break;
+ }
+ case SQUASHFS_LDIR_TYPE: {
+ struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
+ struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
+ sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+ goto failed_read1;
+
+ i->i_size = inodep->file_size;
+ i->i_op = &squashfs_dir_inode_ops_2;
+ i->i_fop = &squashfs_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;
+ SQUASHFS_I(i)->start_block = inodep->start_block;
+ SQUASHFS_I(i)->offset = inodep->offset;
+ SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
+ SQUASHFS_I(i)->u.s2.directory_index_offset =
+ next_offset;
+ SQUASHFS_I(i)->u.s2.directory_index_count =
+ inodep->i_count;
+ SQUASHFS_I(i)->u.s2.parent_inode = 0;
+
+ TRACE("Long directory inode %x:%x, start_block %x, "
+ "offset %x\n",
+ SQUASHFS_INODE_BLK(inode), offset,
+ inodep->start_block, inodep->offset);
+ break;
+ }
+ case SQUASHFS_SYMLINK_TYPE: {
+ struct squashfs_symlink_inode_header_2 *inodep =
+ &id.symlink;
+ struct squashfs_symlink_inode_header_2 *sinodep =
+ &sid.symlink;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
+ sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+ goto failed_read1;
+
+ i->i_size = inodep->symlink_size;
+ i->i_op = &page_symlink_inode_operations;
+ i->i_data.a_ops = &squashfs_symlink_aops;
+ i->i_mode |= S_IFLNK;
+ SQUASHFS_I(i)->start_block = next_block;
+ SQUASHFS_I(i)->offset = next_offset;
+
+ TRACE("Symbolic link inode %x:%x, start_block %llx, "
+ "offset %x\n",
+ SQUASHFS_INODE_BLK(inode), offset,
+ next_block, next_offset);
+ break;
+ }
+ case SQUASHFS_BLKDEV_TYPE:
+ case SQUASHFS_CHRDEV_TYPE: {
+ struct squashfs_dev_inode_header_2 *inodep = &id.dev;
+ struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
+
+ if (msblk->swap) {
+ if (!squashfs_get_cached_block(s, (char *)
+ sinodep, block, offset,
+ sizeof(*sinodep), &next_block,
+ &next_offset))
+ goto failed_read;
+ SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
+ } else
+ if (!squashfs_get_cached_block(s, (char *)
+ inodep, block, offset,
+ sizeof(*inodep), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+ goto failed_read1;
+
+ i->i_mode |= (inodeb->inode_type ==
+ SQUASHFS_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",
+ SQUASHFS_INODE_BLK(inode), offset,
+ inodep->rdev);
+ break;
+ }
+ case SQUASHFS_FIFO_TYPE:
+ case SQUASHFS_SOCKET_TYPE: {
+ if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+ goto failed_read1;
+
+ i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
+ ? S_IFIFO : S_IFSOCK;
+ init_special_inode(i, i->i_mode, 0);
+ break;
+ }
+ default:
+ ERROR("Unknown inode type %d in squashfs_iget!\n",
+ inodeb->inode_type);
+ goto failed_read1;
+ }
+
+ insert_inode_hash(i);
+ return i;
+
+failed_read:
+ ERROR("Unable to read inode [%x:%x]\n", block, offset);
+
+failed_read1:
+ return NULL;
+}
+
+
+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 squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ struct squashfs_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 squashfs_dir_index_2 sindex;
+ squashfs_get_cached_block(s, (char *) &sindex,
+ index_start, index_offset,
+ sizeof(sindex), &index_start,
+ &index_offset);
+ SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
+ } else
+ squashfs_get_cached_block(s, (char *) &index,
+ index_start, index_offset,
+ sizeof(index), &index_start,
+ &index_offset);
+
+ if (index.index > f_pos)
+ break;
+
+ squashfs_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) % SQUASHFS_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 squashfs_sb_info *msblk = s->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ int i, length = 0;
+ char buffer[sizeof(struct squashfs_dir_index_2) + SQUASHFS_NAME_LEN + 1];
+ struct squashfs_dir_index_2 *index = (struct squashfs_dir_index_2 *) buffer;
+ char str[SQUASHFS_NAME_LEN + 1];
+
+ TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+ strncpy(str, name, size);
+ str[size] = '\0';
+
+ for (i = 0; i < i_count; i++) {
+ if (msblk->swap) {
+ struct squashfs_dir_index_2 sindex;
+ squashfs_get_cached_block(s, (char *) &sindex,
+ index_start, index_offset,
+ sizeof(sindex), &index_start,
+ &index_offset);
+ SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
+ } else
+ squashfs_get_cached_block(s, (char *) index,
+ index_start, index_offset,
+ sizeof(struct squashfs_dir_index_2),
+ &index_start, &index_offset);
+
+ squashfs_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) % SQUASHFS_METADATA_SIZE;
+ return length;
+}
+
+
+static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
+{
+ struct inode *i = file->f_dentry->d_inode;
+ struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS_I(i)->offset, length = 0, dirs_read = 0,
+ dir_count;
+ struct squashfs_dir_header_2 dirh;
+ char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN + 1];
+ struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
+
+ TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
+
+ length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_start,
+ SQUASHFS_I(i)->u.s2.directory_index_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_count,
+ file->f_pos);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs_dir_header_2 sdirh;
+
+ if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+ next_block, next_offset, sizeof(sdirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+ } else {
+ if (!squashfs_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 squashfs_dir_entry_2 sdire;
+ if (!squashfs_get_cached_block(i->i_sb, (char *)
+ &sdire, next_block, next_offset,
+ sizeof(sdire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
+ } else {
+ if (!squashfs_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 (!squashfs_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 (file->f_pos >= length)
+ continue;
+
+ dire->name[dire->size + 1] = '\0';
+
+ TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
+ (unsigned int) dirent, dire->name,
+ dire->size + 1, (int) file->f_pos,
+ dirh.start_block, dire->offset,
+ squashfs_filetype_table[dire->type]);
+
+ if (filldir(dirent, dire->name, dire->size + 1,
+ file->f_pos, SQUASHFS_MK_VFS_INODE(
+ dirh.start_block, dire->offset),
+ squashfs_filetype_table[dire->type])
+ < 0) {
+ TRACE("Filldir returned less than 0\n");
+ goto finish;
+ }
+ file->f_pos = length;
+ dirs_read++;
+ }
+ }
+
+finish:
+ return dirs_read;
+
+failed_read:
+ ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+ next_offset);
+ return 0;
+}
+
+
+static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ const unsigned char *name = dentry->d_name.name;
+ int len = dentry->d_name.len;
+ struct inode *inode = NULL;
+ struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+ struct squashfs_super_block *sblk = &msblk->sblk;
+ long long next_block = SQUASHFS_I(i)->start_block +
+ sblk->directory_table_start;
+ int next_offset = SQUASHFS_I(i)->offset, length = 0,
+ dir_count;
+ struct squashfs_dir_header_2 dirh;
+ char buffer[sizeof(struct squashfs_dir_entry_2) + SQUASHFS_NAME_LEN];
+ struct squashfs_dir_entry_2 *dire = (struct squashfs_dir_entry_2 *) buffer;
+ int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
+
+ TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
+
+ if (len > SQUASHFS_NAME_LEN)
+ goto exit_loop;
+
+ length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_start,
+ SQUASHFS_I(i)->u.s2.directory_index_offset,
+ SQUASHFS_I(i)->u.s2.directory_index_count, name,
+ len);
+
+ while (length < i_size_read(i)) {
+ /* read directory header */
+ if (msblk->swap) {
+ struct squashfs_dir_header_2 sdirh;
+ if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+ next_block, next_offset, sizeof(sdirh),
+ &next_block, &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdirh);
+ SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+ } else {
+ if (!squashfs_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 squashfs_dir_entry_2 sdire;
+ if (!squashfs_get_cached_block(i->i_sb, (char *)
+ &sdire, next_block,next_offset,
+ sizeof(sdire), &next_block,
+ &next_offset))
+ goto failed_read;
+
+ length += sizeof(sdire);
+ SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
+ } else {
+ if (!squashfs_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 (!squashfs_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)) {
+ squashfs_inode_t ino =
+ SQUASHFS_MKINODE(dirh.start_block,
+ dire->offset);
+
+ TRACE("calling squashfs_iget for directory "
+ "entry %s, inode %x:%x, %lld\n", name,
+ dirh.start_block, dire->offset, ino);
+
+ inode = (msblk->iget)(i->i_sb, ino);
+
+ goto exit_loop;
+ }
+ }
+ }
+
+exit_loop:
+ 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 squashfs_2_0_supported(struct squashfs_sb_info *msblk)
+{
+ struct squashfs_super_block *sblk = &msblk->sblk;
+
+ msblk->iget = squashfs_iget_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;
+}
diff -urN linux-2.6.19.old/fs/squashfs/squashfs.h linux-2.6.19.dev/fs/squashfs/squashfs.h
--- linux-2.6.19.old/fs/squashfs/squashfs.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19.dev/fs/squashfs/squashfs.h 2006-12-14 03:13:16.000000000 +0100
@@ -0,0 +1,86 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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.
+ *
+ * squashfs.h
+ */
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+#endif
+
+#ifdef SQUASHFS_TRACE
+#define TRACE(s, args...) printk(KERN_NOTICE "SQUASHFS: "s, ## args)
+#else
+#define TRACE(s, args...) {}
+#endif
+
+#define ERROR(s, args...) printk(KERN_ERR "SQUASHFS error: "s, ## args)
+
+#define SERROR(s, args...) do { \
+ if (!silent) \
+ printk(KERN_ERR "SQUASHFS error: "s, ## args);\
+ } while(0)
+
+#define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS: "s, ## args)
+
+static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
+{
+ return list_entry(inode, struct squashfs_inode_info, vfs_inode);
+}
+
+#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY)
+#define SQSH_EXTERN
+extern unsigned int squashfs_read_data(struct super_block *s, char *buffer,
+ long long index, unsigned int length,
+ long long *next_index);
+extern int squashfs_get_cached_block(struct super_block *s, char *buffer,
+ long long block, unsigned int offset,
+ int length, long long *next_block,
+ unsigned int *next_offset);
+extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct
+ squashfs_fragment_cache *fragment);
+extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block
+ *s, long long start_block,
+ int length);
+extern struct address_space_operations squashfs_symlink_aops;
+extern struct address_space_operations squashfs_aops;
+extern struct address_space_operations squashfs_aops_4K;
+extern struct inode_operations squashfs_dir_inode_ops;
+#else
+#define SQSH_EXTERN static
+#endif
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk);
+#else
+static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk);
+#else
+static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
+{
+ return 0;
+}
+#endif
diff -urN linux-2.6.19.old/include/linux/squashfs_fs.h linux-2.6.19.dev/include/linux/squashfs_fs.h
--- linux-2.6.19.old/include/linux/squashfs_fs.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19.dev/include/linux/squashfs_fs.h 2006-12-14 03:13:16.000000000 +0100
@@ -0,0 +1,911 @@
+#ifndef SQUASHFS_FS
+#define SQUASHFS_FS
+
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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.
+ *
+ * squashfs_fs.h
+ */
+
+#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
+#endif
+
+#ifdef CONFIG_SQUASHFS_VMALLOC
+#define SQUASHFS_ALLOC(a) vmalloc(a)
+#define SQUASHFS_FREE(a) vfree(a)
+#else
+#define SQUASHFS_ALLOC(a) kmalloc(a, GFP_KERNEL)
+#define SQUASHFS_FREE(a) kfree(a)
+#endif
+#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
+#define SQUASHFS_MAJOR 3
+#define SQUASHFS_MINOR 0
+#define SQUASHFS_MAGIC 0x73717368
+#define SQUASHFS_MAGIC_SWAP 0x68737173
+#define SQUASHFS_START 0
+
+/* size of metadata (inode and directory) blocks */
+#define SQUASHFS_METADATA_SIZE 8192
+#define SQUASHFS_METADATA_LOG 13
+
+/* default size of data blocks */
+#define SQUASHFS_FILE_SIZE 65536
+#define SQUASHFS_FILE_LOG 16
+
+#define SQUASHFS_FILE_MAX_SIZE 65536
+
+/* Max number of uids and gids */
+#define SQUASHFS_UIDS 256
+#define SQUASHFS_GUIDS 255
+
+/* Max length of filename (not 255) */
+#define SQUASHFS_NAME_LEN 256
+
+#define SQUASHFS_INVALID ((long long) 0xffffffffffff)
+#define SQUASHFS_INVALID_FRAG ((unsigned int) 0xffffffff)
+#define SQUASHFS_INVALID_BLK ((long long) -1)
+#define SQUASHFS_USED_BLK ((long long) -2)
+
+/* Filesystem flags */
+#define SQUASHFS_NOI 0
+#define SQUASHFS_NOD 1
+#define SQUASHFS_CHECK 2
+#define SQUASHFS_NOF 3
+#define SQUASHFS_NO_FRAG 4
+#define SQUASHFS_ALWAYS_FRAG 5
+#define SQUASHFS_DUPLICATE 6
+
+#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
+
+#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NOI)
+
+#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NOD)
+
+#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NOF)
+
+#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NO_FRAG)
+
+#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_ALWAYS_FRAG)
+
+#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_DUPLICATE)
+
+#define SQUASHFS_CHECK_DATA(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_CHECK)
+
+#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
+ duplicate_checking) (noi | (nod << 1) | (check_data << 2) \
+ | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
+ (duplicate_checking << 6))
+
+/* Max number of types and file types */
+#define SQUASHFS_DIR_TYPE 1
+#define SQUASHFS_FILE_TYPE 2
+#define SQUASHFS_SYMLINK_TYPE 3
+#define SQUASHFS_BLKDEV_TYPE 4
+#define SQUASHFS_CHRDEV_TYPE 5
+#define SQUASHFS_FIFO_TYPE 6
+#define SQUASHFS_SOCKET_TYPE 7
+#define SQUASHFS_LDIR_TYPE 8
+#define SQUASHFS_LREG_TYPE 9
+
+/* 1.0 filesystem type definitions */
+#define SQUASHFS_TYPES 5
+#define SQUASHFS_IPC_TYPE 0
+
+/* Flag whether block is compressed or uncompressed, bit is set if block is
+ * uncompressed */
+#define SQUASHFS_COMPRESSED_BIT (1 << 15)
+
+#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
+ (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
+
+#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
+
+#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
+
+#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) (((B) & \
+ ~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \
+ ~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK)
+
+#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
+
+/*
+ * Inode number ops. Inodes consist of a compressed block number, and an
+ * uncompressed offset within that block
+ */
+#define SQUASHFS_INODE_BLK(a) ((unsigned int) ((a) >> 16))
+
+#define SQUASHFS_INODE_OFFSET(a) ((unsigned int) ((a) & 0xffff))
+
+#define SQUASHFS_MKINODE(A, B) ((squashfs_inode_t)(((squashfs_inode_t) (A)\
+ << 16) + (B)))
+
+/* Compute 32 bit VFS inode number from squashfs inode number */
+#define SQUASHFS_MK_VFS_INODE(a, b) ((unsigned int) (((a) << 8) + \
+ ((b) >> 2) + 1))
+/* XXX */
+
+/* Translate between VFS mode and squashfs mode */
+#define SQUASHFS_MODE(a) ((a) & 0xfff)
+
+/* fragment and fragment table defines */
+#define SQUASHFS_FRAGMENT_BYTES(A) (A * sizeof(struct squashfs_fragment_entry))
+
+#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
+ SQUASHFS_METADATA_SIZE - 1) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
+ sizeof(long long))
+
+/* cached data constants for filesystem */
+#define SQUASHFS_CACHED_BLKS 8
+
+#define SQUASHFS_MAX_FILE_SIZE_LOG 64
+
+#define SQUASHFS_MAX_FILE_SIZE ((long long) 1 << \
+ (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
+
+#define SQUASHFS_MARKER_BYTE 0xff
+
+/* meta index cache */
+#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
+#define SQUASHFS_META_ENTRIES 31
+#define SQUASHFS_META_NUMBER 8
+#define SQUASHFS_SLOTS 4
+
+struct meta_entry {
+ long long data_block;
+ unsigned int index_block;
+ unsigned short offset;
+ unsigned short pad;
+};
+
+struct meta_index {
+ unsigned int inode_number;
+ unsigned int offset;
+ unsigned short entries;
+ unsigned short skip;
+ unsigned short locked;
+ unsigned short pad;
+ struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
+};
+
+
+/*
+ * definitions for structures on disk
+ */
+
+typedef long long squashfs_block_t;
+typedef long long squashfs_inode_t;
+
+struct squashfs_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 */;
+ squashfs_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 unused;
+} __attribute__ ((packed));
+
+struct squashfs_dir_index {
+ unsigned int index;
+ unsigned int start_block;
+ unsigned char size;
+ unsigned char name[0];
+} __attribute__ ((packed));
+
+#define SQUASHFS_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 squashfs_base_inode_header {
+ SQUASHFS_BASE_INODE_HEADER;
+} __attribute__ ((packed));
+
+struct squashfs_ipc_inode_header {
+ SQUASHFS_BASE_INODE_HEADER;
+ unsigned int nlink;
+} __attribute__ ((packed));
+
+struct squashfs_dev_inode_header {
+ SQUASHFS_BASE_INODE_HEADER;
+ unsigned int nlink;
+ unsigned short rdev;
+} __attribute__ ((packed));
+
+struct squashfs_symlink_inode_header {
+ SQUASHFS_BASE_INODE_HEADER;
+ unsigned int nlink;
+ unsigned short symlink_size;
+ char symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs_reg_inode_header {
+ SQUASHFS_BASE_INODE_HEADER;
+ squashfs_block_t start_block;
+ unsigned int fragment;
+ unsigned int offset;
+ unsigned int file_size;
+ unsigned short block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_lreg_inode_header {
+ SQUASHFS_BASE_INODE_HEADER;
+ unsigned int nlink;
+ squashfs_block_t start_block;
+ unsigned int fragment;
+ unsigned int offset;
+ long long file_size;
+ unsigned short block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_inode_header {
+ SQUASHFS_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 squashfs_ldir_inode_header {
+ SQUASHFS_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 squashfs_dir_index index[0];
+} __attribute__ ((packed));
+
+union squashfs_inode_header {
+ struct squashfs_base_inode_header base;
+ struct squashfs_dev_inode_header dev;
+ struct squashfs_symlink_inode_header symlink;
+ struct squashfs_reg_inode_header reg;
+ struct squashfs_lreg_inode_header lreg;
+ struct squashfs_dir_inode_header dir;
+ struct squashfs_ldir_inode_header ldir;
+ struct squashfs_ipc_inode_header ipc;
+};
+
+struct squashfs_dir_entry {
+ unsigned int offset:13;
+ unsigned int type:3;
+ unsigned int size:8;
+ int inode_number:16;
+ char name[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_header {
+ unsigned int count:8;
+ unsigned int start_block;
+ unsigned int inode_number;
+} __attribute__ ((packed));
+
+struct squashfs_fragment_entry {
+ long long start_block;
+ unsigned int size;
+ unsigned int unused;
+} __attribute__ ((packed));
+
+extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen);
+extern int squashfs_uncompress_init(void);
+extern int squashfs_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 SQUASHFS_SWAP_START \
+ int bits;\
+ int b_pos;\
+ unsigned long long val;\
+ unsigned char *s;\
+ unsigned char *d;
+
+#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\
+ SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
+ SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
+ SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\
+ SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\
+ SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\
+ SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\
+ SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\
+ SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
+ SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
+ SQUASHFS_SWAP((s)->block_size_1, d, 256, 16);\
+ SQUASHFS_SWAP((s)->block_log, d, 272, 16);\
+ SQUASHFS_SWAP((s)->flags, d, 288, 8);\
+ SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\
+ SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\
+ SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\
+ SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\
+ SQUASHFS_SWAP((s)->block_size, d, 408, 32);\
+ SQUASHFS_SWAP((s)->fragments, d, 440, 32);\
+ SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\
+ SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\
+ SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\
+ SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\
+ SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\
+ SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\
+ SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\
+ SQUASHFS_SWAP((s)->unused, d, 888, 64);\
+}
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
+ SQUASHFS_MEMSET(s, d, n);\
+ SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
+ SQUASHFS_SWAP((s)->mode, d, 4, 12);\
+ SQUASHFS_SWAP((s)->uid, d, 16, 8);\
+ SQUASHFS_SWAP((s)->guid, d, 24, 8);\
+ SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
+ SQUASHFS_SWAP((s)->inode_number, d, 64, 32);
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs_ipc_inode_header))\
+ SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+}
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs_dev_inode_header)); \
+ SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS_SWAP((s)->rdev, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs_symlink_inode_header));\
+ SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs_reg_inode_header));\
+ SQUASHFS_SWAP((s)->start_block, d, 96, 64);\
+ SQUASHFS_SWAP((s)->fragment, d, 160, 32);\
+ SQUASHFS_SWAP((s)->offset, d, 192, 32);\
+ SQUASHFS_SWAP((s)->file_size, d, 224, 32);\
+}
+
+#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs_lreg_inode_header));\
+ SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS_SWAP((s)->start_block, d, 128, 64);\
+ SQUASHFS_SWAP((s)->fragment, d, 192, 32);\
+ SQUASHFS_SWAP((s)->offset, d, 224, 32);\
+ SQUASHFS_SWAP((s)->file_size, d, 256, 64);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs_dir_inode_header));\
+ SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS_SWAP((s)->file_size, d, 128, 19);\
+ SQUASHFS_SWAP((s)->offset, d, 147, 13);\
+ SQUASHFS_SWAP((s)->start_block, d, 160, 32);\
+ SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\
+}
+
+#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+ sizeof(struct squashfs_ldir_inode_header));\
+ SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+ SQUASHFS_SWAP((s)->file_size, d, 128, 27);\
+ SQUASHFS_SWAP((s)->offset, d, 155, 13);\
+ SQUASHFS_SWAP((s)->start_block, d, 168, 32);\
+ SQUASHFS_SWAP((s)->i_count, d, 200, 16);\
+ SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\
+ SQUASHFS_SWAP((s)->index, d, 0, 32);\
+ SQUASHFS_SWAP((s)->start_block, d, 32, 32);\
+ SQUASHFS_SWAP((s)->size, d, 64, 8);\
+}
+
+#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\
+ SQUASHFS_SWAP((s)->count, d, 0, 8);\
+ SQUASHFS_SWAP((s)->start_block, d, 8, 32);\
+ SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\
+ SQUASHFS_SWAP((s)->offset, d, 0, 13);\
+ SQUASHFS_SWAP((s)->type, d, 13, 3);\
+ SQUASHFS_SWAP((s)->size, d, 16, 8);\
+ SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\
+ SQUASHFS_SWAP((s)->start_block, d, 0, 64);\
+ SQUASHFS_SWAP((s)->size, d, 64, 32);\
+}
+
+#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, n * 2);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ 16)\
+ SQUASHFS_SWAP(s[entry], d, bit_position, 16);\
+}
+
+#define SQUASHFS_SWAP_INTS(s, d, n) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, n * 4);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ 32)\
+ SQUASHFS_SWAP(s[entry], d, bit_position, 32);\
+}
+
+#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, n * 8);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ 64)\
+ SQUASHFS_SWAP(s[entry], d, bit_position, 64);\
+}
+
+#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
+ int entry;\
+ int bit_position;\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, n * bits / 8);\
+ for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+ bits)\
+ SQUASHFS_SWAP(s[entry], d, bit_position, bits);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+
+struct squashfs_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 squashfs_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 squashfs_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 squashfs_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 squashfs_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 squashfs_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));
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n) \
+ SQUASHFS_MEMSET(s, d, n);\
+ SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
+ SQUASHFS_SWAP((s)->mode, d, 4, 12);\
+ SQUASHFS_SWAP((s)->uid, d, 16, 4);\
+ SQUASHFS_SWAP((s)->guid, d, 20, 4);
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER_1(s, d, n) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs_ipc_inode_header_1));\
+ SQUASHFS_SWAP((s)->type, d, 24, 4);\
+ SQUASHFS_SWAP((s)->offset, d, 28, 4);\
+}
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs_dev_inode_header_1));\
+ SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs_symlink_inode_header_1));\
+ SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs_reg_inode_header_1));\
+ SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
+ SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
+ SQUASHFS_SWAP((s)->file_size, d, 88, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+ sizeof(struct squashfs_dir_inode_header_1));\
+ SQUASHFS_SWAP((s)->file_size, d, 24, 19);\
+ SQUASHFS_SWAP((s)->offset, d, 43, 13);\
+ SQUASHFS_SWAP((s)->mtime, d, 56, 32);\
+ SQUASHFS_SWAP((s)->start_block, d, 88, 24);\
+}
+
+#endif
+
+#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+
+struct squashfs_dir_index_2 {
+ unsigned int index:27;
+ unsigned int start_block:29;
+ unsigned char size;
+ unsigned char name[0];
+} __attribute__ ((packed));
+
+struct squashfs_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 squashfs_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 squashfs_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 squashfs_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 squashfs_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 squashfs_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 squashfs_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 squashfs_dir_index_2 index[0];
+} __attribute__ ((packed));
+
+union squashfs_inode_header_2 {
+ struct squashfs_base_inode_header_2 base;
+ struct squashfs_dev_inode_header_2 dev;
+ struct squashfs_symlink_inode_header_2 symlink;
+ struct squashfs_reg_inode_header_2 reg;
+ struct squashfs_dir_inode_header_2 dir;
+ struct squashfs_ldir_inode_header_2 ldir;
+ struct squashfs_ipc_inode_header_2 ipc;
+};
+
+struct squashfs_dir_header_2 {
+ unsigned int count:8;
+ unsigned int start_block:24;
+} __attribute__ ((packed));
+
+struct squashfs_dir_entry_2 {
+ unsigned int offset:13;
+ unsigned int type:3;
+ unsigned int size:8;
+ char name[0];
+} __attribute__ ((packed));
+
+struct squashfs_fragment_entry_2 {
+ unsigned int start_block;
+ unsigned int size;
+} __attribute__ ((packed));
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
+ SQUASHFS_MEMSET(s, d, n);\
+ SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
+ SQUASHFS_SWAP((s)->mode, d, 4, 12);\
+ SQUASHFS_SWAP((s)->uid, d, 16, 8);\
+ SQUASHFS_SWAP((s)->guid, d, 24, 8);\
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \
+ SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2))
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs_dev_inode_header_2)); \
+ SQUASHFS_SWAP((s)->rdev, d, 32, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs_symlink_inode_header_2));\
+ SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs_reg_inode_header_2));\
+ SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
+ SQUASHFS_SWAP((s)->start_block, d, 64, 32);\
+ SQUASHFS_SWAP((s)->fragment, d, 96, 32);\
+ SQUASHFS_SWAP((s)->offset, d, 128, 32);\
+ SQUASHFS_SWAP((s)->file_size, d, 160, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs_dir_inode_header_2));\
+ SQUASHFS_SWAP((s)->file_size, d, 32, 19);\
+ SQUASHFS_SWAP((s)->offset, d, 51, 13);\
+ SQUASHFS_SWAP((s)->mtime, d, 64, 32);\
+ SQUASHFS_SWAP((s)->start_block, d, 96, 24);\
+}
+
+#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+ sizeof(struct squashfs_ldir_inode_header_2));\
+ SQUASHFS_SWAP((s)->file_size, d, 32, 27);\
+ SQUASHFS_SWAP((s)->offset, d, 59, 13);\
+ SQUASHFS_SWAP((s)->mtime, d, 72, 32);\
+ SQUASHFS_SWAP((s)->start_block, d, 104, 24);\
+ SQUASHFS_SWAP((s)->i_count, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\
+ SQUASHFS_SWAP((s)->index, d, 0, 27);\
+ SQUASHFS_SWAP((s)->start_block, d, 27, 29);\
+ SQUASHFS_SWAP((s)->size, d, 56, 8);\
+}
+#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\
+ SQUASHFS_SWAP((s)->count, d, 0, 8);\
+ SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
+}
+
+#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\
+ SQUASHFS_SWAP((s)->offset, d, 0, 13);\
+ SQUASHFS_SWAP((s)->type, d, 13, 3);\
+ SQUASHFS_SWAP((s)->size, d, 16, 8);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\
+ SQUASHFS_SWAP_START\
+ SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\
+ SQUASHFS_SWAP((s)->start_block, d, 0, 32);\
+ SQUASHFS_SWAP((s)->size, d, 32, 32);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n)
+
+/* fragment and fragment table defines */
+#define SQUASHFS_FRAGMENT_BYTES_2(A) (A * sizeof(struct squashfs_fragment_entry_2))
+
+#define SQUASHFS_FRAGMENT_INDEX_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A) (SQUASHFS_FRAGMENT_BYTES_2(A) % \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEXES_2(A) ((SQUASHFS_FRAGMENT_BYTES_2(A) + \
+ SQUASHFS_METADATA_SIZE - 1) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A) (SQUASHFS_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 SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
+ tbits, b_pos)
+#else
+ /* convert from big endian to little endian */
+#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, \
+ tbits, 64 - tbits - b_pos)
+#endif
+
+#define _SQUASHFS_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 SQUASHFS_MEMSET(s, d, n) memset(s, 0, n);
+
+#endif
+#endif
diff -urN linux-2.6.19.old/include/linux/squashfs_fs_i.h linux-2.6.19.dev/include/linux/squashfs_fs_i.h
--- linux-2.6.19.old/include/linux/squashfs_fs_i.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19.dev/include/linux/squashfs_fs_i.h 2006-12-14 03:13:16.000000000 +0100
@@ -0,0 +1,45 @@
+#ifndef SQUASHFS_FS_I
+#define SQUASHFS_FS_I
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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.
+ *
+ * squashfs_fs_i.h
+ */
+
+struct squashfs_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
diff -urN linux-2.6.19.old/include/linux/squashfs_fs_sb.h linux-2.6.19.dev/include/linux/squashfs_fs_sb.h
--- linux-2.6.19.old/include/linux/squashfs_fs_sb.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.19.dev/include/linux/squashfs_fs_sb.h 2006-12-14 03:13:16.000000000 +0100
@@ -0,0 +1,74 @@
+#ifndef SQUASHFS_FS_SB
+#define SQUASHFS_FS_SB
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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.
+ *
+ * squashfs_fs_sb.h
+ */
+
+#include <linux/squashfs_fs.h>
+
+struct squashfs_cache {
+ long long block;
+ int length;
+ long long next_index;
+ char *data;
+};
+
+struct squashfs_fragment_cache {
+ long long block;
+ int length;
+ unsigned int locked;
+ char *data;
+};
+
+struct squashfs_sb_info {
+ struct squashfs_super_block sblk;
+ int devblksize;
+ int devblksize_log2;
+ int swap;
+ struct squashfs_cache *block_cache;
+ struct squashfs_fragment_cache *fragment;
+ int next_cache;
+ int next_fragment;
+ int next_meta_index;
+ unsigned int *uid;
+ unsigned int *guid;
+ long long *fragment_index;
+ unsigned int *fragment_index_2;
+ unsigned int read_size;
+ char *read_data;
+ char *read_page;
+ struct semaphore read_data_mutex;
+ struct semaphore read_page_mutex;
+ struct semaphore block_cache_mutex;
+ struct semaphore fragment_mutex;
+ struct semaphore meta_index_mutex;
+ wait_queue_head_t waitq;
+ wait_queue_head_t fragment_wait_queue;
+ struct meta_index *meta_index;
+ struct inode *(*iget)(struct super_block *s, squashfs_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
diff -urN linux-2.6.19.old/init/do_mounts_rd.c linux-2.6.19.dev/init/do_mounts_rd.c
--- linux-2.6.19.old/init/do_mounts_rd.c 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.19.dev/init/do_mounts_rd.c 2006-12-14 03:13:16.000000000 +0100
@@ -5,6 +5,7 @@
#include <linux/ext2_fs.h>
#include <linux/romfs_fs.h>
#include <linux/cramfs_fs.h>
+#include <linux/squashfs_fs.h>
#include <linux/initrd.h>
#include <linux/string.h>
@@ -39,6 +40,7 @@
* numbers could not be found.
*
* We currently check for the following magic numbers:
+ * squashfs
* minix
* ext2
* romfs
@@ -53,6 +55,7 @@
struct ext2_super_block *ext2sb;
struct romfs_super_block *romfsb;
struct cramfs_super *cramfsb;
+ struct squashfs_super_block *squashfsb;
int nblocks = -1;
unsigned char *buf;
@@ -64,6 +67,7 @@
ext2sb = (struct ext2_super_block *) buf;
romfsb = (struct romfs_super_block *) buf;
cramfsb = (struct cramfs_super *) buf;
+ squashfsb = (struct squashfs_super_block *) buf;
memset(buf, 0xe5, size);
/*
@@ -101,6 +105,15 @@
goto done;
}
+ /* squashfs is at block zero too */
+ if (squashfsb->s_magic == SQUASHFS_MAGIC) {
+ printk(KERN_NOTICE
+ "RAMDISK: squashfs filesystem found at block %d\n",
+ start_block);
+ nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
+ goto done;
+ }
+
/*
* Read block 1 to test for minix and ext2 superblock
*/
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