Index: linux-2.6.23/fs/Kconfig =================================================================== --- linux-2.6.23.orig/fs/Kconfig 2007-10-10 13:52:12.000000000 +0800 +++ linux-2.6.23/fs/Kconfig 2007-10-10 13:52:14.000000000 +0800 @@ -1364,6 +1364,71 @@ 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 . 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 Index: linux-2.6.23/fs/Makefile =================================================================== --- linux-2.6.23.orig/fs/Makefile 2007-10-10 13:52:12.000000000 +0800 +++ linux-2.6.23/fs/Makefile 2007-10-10 13:52:14.000000000 +0800 @@ -72,6 +72,7 @@ obj-$(CONFIG_JBD2) += jbd2/ obj-$(CONFIG_EXT2_FS) += ext2/ obj-$(CONFIG_CRAMFS) += cramfs/ +obj-$(CONFIG_SQUASHFS) += squashfs/ obj-y += ramfs/ obj-$(CONFIG_HUGETLBFS) += hugetlbfs/ obj-$(CONFIG_CODA_FS) += coda/ Index: linux-2.6.23/fs/squashfs/inode.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/fs/squashfs/inode.c 2007-10-10 13:52:14.000000000 +0800 @@ -0,0 +1,2122 @@ +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006 + * Phillip Lougher + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 struct kmem_cache * 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, GFP_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, struct kmem_cache * cachep, unsigned long flags) +{ + struct squashfs_inode_info *ei = foo; + + 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); + 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 "); +MODULE_LICENSE("GPL"); Index: linux-2.6.23/fs/squashfs/Makefile =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/fs/squashfs/Makefile 2007-10-10 13:52:14.000000000 +0800 @@ -0,0 +1,7 @@ +# +# Makefile for the linux squashfs routines. +# + +obj-$(CONFIG_SQUASHFS) += squashfs.o +squashfs-y += inode.o +squashfs-y += squashfs2_0.o Index: linux-2.6.23/fs/squashfs/squashfs2_0.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/fs/squashfs/squashfs2_0.c 2007-10-10 13:52:14.000000000 +0800 @@ -0,0 +1,758 @@ +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006 + * Phillip Lougher + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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; +} Index: linux-2.6.23/fs/squashfs/squashfs.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/fs/squashfs/squashfs.h 2007-10-10 13:52:14.000000000 +0800 @@ -0,0 +1,86 @@ +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006 + * Phillip Lougher + * + * 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 Index: linux-2.6.23/include/linux/magic.h =================================================================== --- linux-2.6.23.orig/include/linux/magic.h 2007-10-10 13:52:12.000000000 +0800 +++ linux-2.6.23/include/linux/magic.h 2007-10-10 13:52:14.000000000 +0800 @@ -35,6 +35,9 @@ #define REISER2FS_SUPER_MAGIC_STRING "ReIsEr2Fs" #define REISER2FS_JR_SUPER_MAGIC_STRING "ReIsEr3Fs" +#define SQUASHFS_MAGIC 0x73717368 +#define SQUASHFS_MAGIC_SWAP 0x68737173 + #define SMB_SUPER_MAGIC 0x517B #define USBDEVICE_SUPER_MAGIC 0x9fa2 Index: linux-2.6.23/include/linux/squashfs_fs.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/include/linux/squashfs_fs.h 2007-10-10 13:52:14.000000000 +0800 @@ -0,0 +1,911 @@ +#ifndef SQUASHFS_FS +#define SQUASHFS_FS + +/* + * Squashfs + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006 + * Phillip Lougher + * + * 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_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 + +#include + +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 + +#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 Index: linux-2.6.23/include/linux/squashfs_fs_i.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/include/linux/squashfs_fs_i.h 2007-10-10 13:52:14.000000000 +0800 @@ -0,0 +1,45 @@ +#ifndef SQUASHFS_FS_I +#define SQUASHFS_FS_I +/* + * Squashfs + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006 + * Phillip Lougher + * + * 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 Index: linux-2.6.23/include/linux/squashfs_fs_sb.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.23/include/linux/squashfs_fs_sb.h 2007-10-10 13:52:14.000000000 +0800 @@ -0,0 +1,74 @@ +#ifndef SQUASHFS_FS_SB +#define SQUASHFS_FS_SB +/* + * Squashfs + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006 + * Phillip Lougher + * + * 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 + +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 Index: linux-2.6.23/init/do_mounts_rd.c =================================================================== --- linux-2.6.23.orig/init/do_mounts_rd.c 2007-10-10 13:52:12.000000000 +0800 +++ linux-2.6.23/init/do_mounts_rd.c 2007-10-10 13:52:14.000000000 +0800 @@ -5,6 +5,7 @@ #include #include #include +#include #include #include @@ -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 */