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4003_squashfs-3.0.patch
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4003_squashfs-3.0.patch
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diff --new-file -urp linux-2.6.15/fs/Kconfig linux-2.6.15-squashfs3.0/fs/Kconfig
--- linux-2.6.15/fs/Kconfig 2006-03-01 22:37:27.000000000 +0000
+++ linux-2.6.15-squashfs3.0/fs/Kconfig 2006-03-07 21:12:37.000000000 +0000
@@ -1151,6 +1151,71 @@ config CRAMFS
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)"
help
diff --new-file -urp linux-2.6.15/fs/Makefile linux-2.6.15-squashfs3.0/fs/Makefile
--- linux-2.6.15/fs/Makefile 2006-03-01 22:37:27.000000000 +0000
+++ linux-2.6.15-squashfs3.0/fs/Makefile 2006-03-07 21:12:37.000000000 +0000
@@ -55,6 +55,7 @@ obj-$(CONFIG_EXT3_FS) += ext3/ # Before
obj-$(CONFIG_JBD) += jbd/
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 --new-file -urp linux-2.6.15/fs/squashfs/inode.c linux-2.6.15-squashfs3.0/fs/squashfs/inode.c
--- linux-2.6.15/fs/squashfs/inode.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.15-squashfs3.0/fs/squashfs/inode.c 2006-03-07 21:12:37.000000000 +0000
@@ -0,0 +1,2127 @@
+/*
+ * 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 super_block *, 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 struct super_block *squashfs_get_sb(struct file_system_type *, int,
+ const char *, void *);
+
+
+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;
+ 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 %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;
+ 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 %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;
+ }