diff --new-file -ur linux-2.4.28/fs/Config.in linux-2.4.28-squashfs2.1-r2/fs/Config.in --- linux-2.4.28/fs/Config.in 2004-11-17 11:54:21.000000000 +0000 +++ linux-2.4.28-squashfs2.1-r2/fs/Config.in 2004-12-02 02:14:05.000000000 +0000 @@ -51,6 +51,7 @@ int 'JFFS2 debugging verbosity (0 = quiet, 2 = noisy)' CONFIG_JFFS2_FS_DEBUG 0 fi tristate 'Compressed ROM file system support' CONFIG_CRAMFS +tristate 'Squashed file system support' CONFIG_SQUASHFS bool 'Virtual memory file system support (former shm fs)' CONFIG_TMPFS define_bool CONFIG_RAMFS y diff --new-file -ur linux-2.4.28/fs/Makefile linux-2.4.28-squashfs2.1-r2/fs/Makefile --- linux-2.4.28/fs/Makefile 2004-02-18 13:36:31.000000000 +0000 +++ linux-2.4.28-squashfs2.1-r2/fs/Makefile 2004-12-02 02:14:05.000000000 +0000 @@ -65,6 +65,7 @@ subdir-$(CONFIG_DEVPTS_FS) += devpts subdir-$(CONFIG_SUN_OPENPROMFS) += openpromfs subdir-$(CONFIG_BEFS_FS) += befs +subdir-$(CONFIG_SQUASHFS) += squashfs subdir-$(CONFIG_JFS_FS) += jfs subdir-$(CONFIG_XFS_FS) += xfs diff --new-file -ur linux-2.4.28/fs/squashfs/inode.c linux-2.4.28-squashfs2.1-r2/fs/squashfs/inode.c --- linux-2.4.28/fs/squashfs/inode.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.28-squashfs2.1-r2/fs/squashfs/inode.c 2004-12-15 10:13:06.000000000 +0000 @@ -0,0 +1,1677 @@ +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004 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 - a compressed read only filesystem for Linux + * + * inode.c + */ + +#define SQUASHFS_1_0_COMPATIBILITY + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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...) if(!silent) printk(KERN_ERR "SQUASHFS error: "s, ## args) +#define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS: "s, ## args) + +static struct super_block *squashfs_read_super(struct super_block *, void *, int); +static void squashfs_put_super(struct super_block *); +static int squashfs_statfs(struct super_block *, struct statfs *); +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 dentry *squashfs_lookup(struct inode *, struct dentry *); +static unsigned int read_data(struct super_block *s, char *buffer, + unsigned int index, unsigned int length, unsigned int *next_index); +static int squashfs_get_cached_block(struct super_block *s, char *buffer, + unsigned int block, unsigned int offset, int length, + unsigned int *next_block, unsigned int *next_offset); +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode inode); +static unsigned int read_blocklist(struct inode *inode, int index, int readahead_blks, + char *block_list, unsigned short **block_p, unsigned int *bsize); +static void squashfs_put_super(struct super_block *s); + +#ifdef SQUASHFS_1_0_COMPATIBILITY +static int squashfs_readpage_lessthan4K(struct file *file, struct page *page); +static struct inode *squashfs_iget_1(struct super_block *s, squashfs_inode inode); +static unsigned int read_blocklist_1(struct inode *inode, int index, int readahead_blks, + char *block_list, unsigned short **block_p, unsigned int *bsize); +#endif + +DECLARE_MUTEX(read_data_mutex); + +static z_stream stream; + +static DECLARE_FSTYPE_DEV(squashfs_fs_type, "squashfs", squashfs_read_super); + +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 = { + statfs: squashfs_statfs, + put_super: squashfs_put_super, +}; + +static struct address_space_operations squashfs_symlink_aops = { + readpage: squashfs_symlink_readpage +}; + +static struct address_space_operations squashfs_aops = { + readpage: squashfs_readpage +}; + +static struct address_space_operations squashfs_aops_4K = { + readpage: squashfs_readpage4K +}; + +#ifdef SQUASHFS_1_0_COMPATIBILITY +static struct address_space_operations squashfs_aops_lessthan4K = { + readpage: squashfs_readpage_lessthan4K +}; +#endif + +static struct file_operations squashfs_dir_ops = { + read: generic_read_dir, + readdir: squashfs_readdir +}; + +static 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) +{ + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + unsigned short temp; + struct buffer_head *bh; + + if(!(bh = sb_bread(s, *cur_index))) + return NULL; + + 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)))) + return NULL; + 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 short temp; + ((unsigned char *) &temp)[1] = *((unsigned char *) (bh->b_data + *offset)); + ((unsigned char *) &temp)[0] = *((unsigned char *) (bh->b_data + *offset + 1)); + *c_byte = temp; + } else + *c_byte = *((unsigned short *) (bh->b_data + *offset)); + *offset += 2; + } + if(SQUASHFS_CHECK_DATA(msBlk->sBlk.flags)) { + if(*offset == msBlk->devblksize) { + brelse(bh); + if(!(bh = sb_bread(s, ++(*cur_index)))) + return NULL; + offset = 0; + } + if(*((unsigned char *) (bh->b_data + *offset)) != SQUASHFS_MARKER_BYTE) { + ERROR("Metadata block marker corrupt @ %x\n", *cur_index); + brelse(bh); + return NULL; + } + *offset ++; + } + + return bh; +} + + +static unsigned int read_data(struct super_block *s, char *buffer, + unsigned int index, unsigned int length, unsigned int *next_index) +{ + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + 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%x, %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%x, %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(&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]); + 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(&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; +} +static int squashfs_get_cached_block(struct super_block *s, char *buffer, + unsigned int block, unsigned int offset, int length, + unsigned int *next_block, unsigned int *next_offset) +{ + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + int n, i, bytes, return_length = length; + unsigned int next_index; + + TRACE("Entered squashfs_get_cached_block [%x:%x]\n", block, offset); + + for(;;) { + 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) { + up(&msBlk->block_cache_mutex); + sleep_on(&msBlk->waitq); + continue; + } + msBlk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS; + + if(msBlk->block_cache[i].block == SQUASHFS_INVALID_BLK) { + if(!(msBlk->block_cache[i].data = (unsigned char *) + kmalloc(SQUASHFS_METADATA_SIZE, GFP_KERNEL))) { + ERROR("Failed to allocate cache block\n"); + up(&msBlk->block_cache_mutex); + return 0; + } + } + + msBlk->block_cache[i].block = SQUASHFS_USED_BLK; + up(&msBlk->block_cache_mutex); + if(!(msBlk->block_cache[i].length = read_data(s, msBlk->block_cache[i].data, block, 0, + &next_index))) { + ERROR("Unable to read cache block [%x:%x]\n", block, offset); + return 0; + } + 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 [%x:%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); + return return_length; + } 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; + } + } +} + + +static int get_fragment_location(struct super_block *s, unsigned int fragment, unsigned int *fragment_start_block, unsigned int *fragment_size) +{ + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + unsigned int start_block = msBlk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)]; + int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment); + squashfs_fragment_entry fragment_entry; + + if(msBlk->swap) { + squashfs_fragment_entry sfragment_entry; + + if(!squashfs_get_cached_block(s, (char *) &sfragment_entry, start_block, offset, + sizeof(sfragment_entry), &start_block, &offset)) + return 0; + 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)) + return 0; + + *fragment_start_block = fragment_entry.start_block; + *fragment_size = fragment_entry.size; + + return 1; +} + + +void release_cached_fragment(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); +} + + +struct squashfs_fragment_cache *get_cached_fragment(struct super_block *s, unsigned int start_block, int length) +{ + int i, n; + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + + for(;;) { + 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) { + up(&msBlk->fragment_mutex); + sleep_on(&msBlk->fragment_wait_queue); + continue; + } + msBlk->next_fragment = (msBlk->next_fragment + 1) % SQUASHFS_CACHED_FRAGMENTS; + + if(msBlk->fragment[i].data == NULL) + if(!(msBlk->fragment[i].data = (unsigned char *) + kmalloc(SQUASHFS_FILE_MAX_SIZE, GFP_KERNEL))) { + ERROR("Failed to allocate fragment cache block\n"); + up(&msBlk->fragment_mutex); + return NULL; + } + + msBlk->fragment[i].block = SQUASHFS_INVALID_BLK; + msBlk->fragment[i].locked = 1; + up(&msBlk->fragment_mutex); + if(!(msBlk->fragment[i].length = read_data(s, msBlk->fragment[i].data, start_block, length, + NULL))) { + ERROR("Unable to read fragment cache block [%x]\n", start_block); + msBlk->fragment[i].locked = 0; + return NULL; + } + msBlk->fragment[i].block = start_block; + TRACE("New fragment %d, start block %d, locked %d\n", i, msBlk->fragment[i].block, msBlk->fragment[i].locked); + return &msBlk->fragment[i]; + } + + msBlk->fragment[i].locked ++; + up(&msBlk->fragment_mutex); + + TRACE("Got fragment %d, start block %d, locked %d\n", i, msBlk->fragment[i].block, msBlk->fragment[i].locked); + return &msBlk->fragment[i]; + } +} + + +#ifdef SQUASHFS_1_0_COMPATIBILITY +static struct inode *squashfs_iget_1(struct super_block *s, squashfs_inode inode) +{ + struct inode *i = new_inode(s); + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + 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 next_block, next_offset; + squashfs_base_inode_header_1 inodeb; + + TRACE("Entered squashfs_iget_1\n"); + + if(msBlk->swap) { + squashfs_base_inode_header_1 sinodeb; + + if(!squashfs_get_cached_block(s, (char *) &sinodeb, block, offset, + sizeof(sinodeb), &next_block, &next_offset)) + goto failed_read; + SQUASHFS_SWAP_BASE_INODE_HEADER_1(&inodeb, &sinodeb, sizeof(sinodeb)); + } else + if(!squashfs_get_cached_block(s, (char *) &inodeb, block, offset, + sizeof(inodeb), &next_block, &next_offset)) + goto failed_read; + + i->i_nlink = 1; + + i->i_mtime = sBlk->mkfs_time; + i->i_atime = sBlk->mkfs_time; + i->i_ctime = sBlk->mkfs_time; + + if(inodeb.inode_type != SQUASHFS_IPC_TYPE) + i->i_uid = msBlk->uid[((inodeb.inode_type - 1) / SQUASHFS_TYPES) * 16 + inodeb.uid]; + i->i_ino = SQUASHFS_MK_VFS_INODE(block - sBlk->inode_table_start, offset); + + i->i_mode = inodeb.mode; + + switch(inodeb.inode_type == SQUASHFS_IPC_TYPE ? SQUASHFS_IPC_TYPE : (inodeb.inode_type - 1) % SQUASHFS_TYPES + 1) { + case SQUASHFS_FILE_TYPE: { + squashfs_reg_inode_header_1 inodep; + + if(msBlk->swap) { + squashfs_reg_inode_header_1 sinodep; + + if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep), + &next_block, &next_offset)) + goto failed_read; + SQUASHFS_SWAP_REG_INODE_HEADER_1(&inodep, &sinodep); + } else + if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep), + &next_block, &next_offset)) + goto failed_read; + + i->i_size = inodep.file_size; + i->i_fop = &generic_ro_fops; + if(sBlk->block_size > 4096) + i->i_data.a_ops = &squashfs_aops; + else if(sBlk->block_size == 4096) + i->i_data.a_ops = &squashfs_aops_4K; + else + i->i_data.a_ops = &squashfs_aops_lessthan4K; + i->i_mode |= S_IFREG; + i->i_mtime = inodep.mtime; + i->i_atime = inodep.mtime; + i->i_ctime = inodep.mtime; + i->i_blocks = ((i->i_size - 1) >> 9) + 1; + i->i_blksize = PAGE_CACHE_SIZE; + i->u.squashfs_i.u.s1.fragment_start_block = SQUASHFS_INVALID_BLK; + i->u.squashfs_i.u.s1.fragment_offset = 0; + i->u.squashfs_i.start_block = inodep.start_block; + i->u.squashfs_i.block_list_start = next_block; + i->u.squashfs_i.offset = next_offset; + TRACE("File inode %x:%x, start_block %x, block_list_start %x, offset %x\n", + SQUASHFS_INODE_BLK(inode), offset, inodep.start_block, next_block, next_offset); + break; + } + case SQUASHFS_DIR_TYPE: { + squashfs_dir_inode_header_1 inodep; + + if(msBlk->swap) { + squashfs_dir_inode_header_1 sinodep; + + if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep), + &next_block, &next_offset)) + goto failed_read; + SQUASHFS_SWAP_DIR_INODE_HEADER_1(&inodep, &sinodep); + } else + if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep), + &next_block, &next_offset)) + goto failed_read; + + i->i_size = inodep.file_size; + i->i_op = &squashfs_dir_inode_ops; + i->i_fop = &squashfs_dir_ops; + i->i_mode |= S_IFDIR; + i->i_mtime = inodep.mtime; + i->i_atime = inodep.mtime; + i->i_ctime = inodep.mtime; + i->u.squashfs_i.start_block = inodep.start_block; + i->u.squashfs_i.offset = inodep.offset; + i->u.squashfs_i.u.s2.directory_index_count = 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_SYMLINK_TYPE: { + squashfs_symlink_inode_header_1 inodep; + + if(msBlk->swap) { + squashfs_symlink_inode_header_1 sinodep; + + if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep), + &next_block, &next_offset)) + goto failed_read; + SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(&inodep, &sinodep); + } else + if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep), + &next_block, &next_offset)) + goto failed_read; + + i->i_size = inodep.symlink_size; + i->i_op = &page_symlink_inode_operations; + i->i_data.a_ops = &squashfs_symlink_aops; + i->i_mode |= S_IFLNK; + i->u.squashfs_i.start_block = next_block; + i->u.squashfs_i.offset = next_offset; + TRACE("Symbolic link inode %x:%x, start_block %x, offset %x\n", + SQUASHFS_INODE_BLK(inode), offset, next_block, next_offset); + break; + } + case SQUASHFS_BLKDEV_TYPE: + case SQUASHFS_CHRDEV_TYPE: { + squashfs_dev_inode_header_1 inodep; + + if(msBlk->swap) { + squashfs_dev_inode_header_1 sinodep; + + if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep), + &next_block, &next_offset)) + goto failed_read; + SQUASHFS_SWAP_DEV_INODE_HEADER_1(&inodep, &sinodep); + } else + if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep), + &next_block, &next_offset)) + goto failed_read; + + i->i_size = 0; + i->i_mode |= (inodeb.inode_type == SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : S_IFBLK; + init_special_inode(i, i->i_mode, inodep.rdev); + TRACE("Device inode %x:%x, rdev %x\n", SQUASHFS_INODE_BLK(inode), offset, inodep.rdev); + break; + } + case SQUASHFS_IPC_TYPE: { + squashfs_ipc_inode_header_1 inodep; + + if(msBlk->swap) { + squashfs_ipc_inode_header_1 sinodep; + + if(!squashfs_get_cached_block(s, (char *) &sinodep, block, offset, sizeof(sinodep), + &next_block, &next_offset)) + goto failed_read; + SQUASHFS_SWAP_IPC_INODE_HEADER_1(&inodep, &sinodep); + } else + if(!squashfs_get_cached_block(s, (char *) &inodep, block, offset, sizeof(inodep), + &next_block, &next_offset)) + goto failed_read; + + i->i_size = 0; + i->i_mode |= (inodep.type == SQUASHFS_FIFO_TYPE) ? S_IFIFO : S_IFSOCK; + i->i_uid = msBlk->uid[inodep.offset * 16 + inodeb.uid]; + 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; + } + + if(inodeb.guid == 15) + i->i_gid = i->i_uid; + else + i->i_gid = msBlk->guid[inodeb.guid]; + + insert_inode_hash(i); + return i; + +failed_read: + ERROR("Unable to read inode [%x:%x]\n", block, offset); + +failed_read1: + return NULL; +} +#endif + + +static struct inode *squashfs_iget(struct super_block *s, squashfs_inode inode) +{ + struct inode *i = new_inode(s); + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + 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 next_block, next_offset; + squashfs_base_inode_header inodeb; + + TRACE("Entered squashfs_iget\n"); + + if(msBlk->swap) { + squashfs_base_inode_header sinodeb; + + 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; + + i->i_nlink = 1; + + i->i_mtime = sBlk->mkfs_time; + i->i_atime = sBlk->mkfs_time; + i->i_ctime = sBlk->mkfs_time; + + i->i_uid = msBlk->uid[inodeb.uid]; + i->i_ino = SQUASHFS_MK_VFS_INODE(block - sBlk->inode_table_start, offset); + + i->i_mode = inodeb.mode; + + switch(inodeb.inode_type) { + case SQUASHFS_FILE_TYPE: { + squashfs_reg_inode_header inodep; + + if(msBlk->swap) { + squashfs_reg_inode_header sinodep; + + 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; + + i->u.squashfs_i.u.s1.fragment_start_block = SQUASHFS_INVALID_BLK; + if(inodep.fragment != SQUASHFS_INVALID_BLK && !get_fragment_location(s, inodep.fragment, + &i->u.squashfs_i.u.s1.fragment_start_block, &i->u.squashfs_i.u.s1.fragment_size)) + goto failed_read; + + i->u.squashfs_i.u.s1.fragment_offset = inodep.offset; + i->i_size = inodep.file_size; + i->i_fop = &generic_ro_fops; + if(sBlk->block_size > 4096) + i->i_data.a_ops = &squashfs_aops; + else + i->i_data.a_ops = &squashfs_aops_4K; + i->i_mode |= S_IFREG; + i->i_mtime = inodep.mtime; + i->i_atime = inodep.mtime; + i->i_ctime = inodep.mtime; + i->i_blocks = ((i->i_size - 1) >> 9) + 1; + i->i_blksize = PAGE_CACHE_SIZE; + i->u.squashfs_i.start_block = inodep.start_block; + i->u.squashfs_i.block_list_start = next_block; + i->u.squashfs_i.offset = next_offset; + TRACE("File inode %x:%x, start_block %x, block_list_start %x, offset %x fragment_index %x fragment_offset %x\n", + SQUASHFS_INODE_BLK(inode), offset, inodep.start_block, next_block, next_offset, inodep.fragment, inodep.offset); + break; + } + case SQUASHFS_DIR_TYPE: { + squashfs_dir_inode_header inodep; + + if(msBlk->swap) { + squashfs_dir_inode_header sinodep; + + 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; + + i->i_size = inodep.file_size; + i->i_op = &squashfs_dir_inode_ops; + i->i_fop = &squashfs_dir_ops; + i->i_mode |= S_IFDIR; + i->i_mtime = inodep.mtime; + i->i_atime = inodep.mtime; + i->i_ctime = inodep.mtime; + i->u.squashfs_i.start_block = inodep.start_block; + i->u.squashfs_i.offset = inodep.offset; + i->u.squashfs_i.u.s2.directory_index_count = 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: { + squashfs_ldir_inode_header inodep; + + if(msBlk->swap) { + squashfs_ldir_inode_header sinodep; + + 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; + + i->i_size = inodep.file_size; + i->i_op = &squashfs_dir_inode_ops; + i->i_fop = &squashfs_dir_ops; + i->i_mode |= S_IFDIR; + i->i_mtime = inodep.mtime; + i->i_atime = inodep.mtime; + i->i_ctime = inodep.mtime; + i->u.squashfs_i.start_block = inodep.start_block; + i->u.squashfs_i.offset = inodep.offset; + i->u.squashfs_i.u.s2.directory_index_start = next_block; + i->u.squashfs_i.u.s2.directory_index_offset = next_offset; + i->u.squashfs_i.u.s2.directory_index_count = inodep.i_count; + 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: { + squashfs_symlink_inode_header inodep; + + if(msBlk->swap) { + squashfs_symlink_inode_header sinodep; + + 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; + + 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; + i->u.squashfs_i.start_block = next_block; + i->u.squashfs_i.offset = next_offset; + TRACE("Symbolic link inode %x:%x, start_block %x, offset %x\n", + SQUASHFS_INODE_BLK(inode), offset, next_block, next_offset); + break; + } + case SQUASHFS_BLKDEV_TYPE: + case SQUASHFS_CHRDEV_TYPE: { + squashfs_dev_inode_header inodep; + + if(msBlk->swap) { + squashfs_dev_inode_header sinodep; + + 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; + + i->i_size = 0; + i->i_mode |= (inodeb.inode_type == SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : S_IFBLK; + init_special_inode(i, i->i_mode, 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: { + i->i_size = 0; + 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; + } + + if(inodeb.guid == SQUASHFS_GUIDS) + i->i_gid = i->i_uid; + else + i->i_gid = msBlk->guid[inodeb.guid]; + + insert_inode_hash(i); + return i; + +failed_read: + ERROR("Unable to read inode [%x:%x]\n", block, offset); + +failed_read1: + return NULL; +} + + +static struct super_block *squashfs_read_super(struct super_block *s, + void *data, int silent) +{ + kdev_t dev = s->s_dev; + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + int i; + + TRACE("Entered squashfs_read_superblock\n"); + + msBlk->devblksize = get_hardsect_size(dev); + if(msBlk->devblksize < BLOCK_SIZE) + msBlk->devblksize = BLOCK_SIZE; + msBlk->devblksize_log2 = ffz(~msBlk->devblksize); + set_blocksize(dev, msBlk->devblksize); + s->s_blocksize = msBlk->devblksize; + s->s_blocksize_bits = msBlk->devblksize_log2; + + init_MUTEX(&msBlk->read_page_mutex); + init_MUTEX(&msBlk->block_cache_mutex); + init_MUTEX(&msBlk->fragment_mutex); + + init_waitqueue_head(&msBlk->waitq); + init_waitqueue_head(&msBlk->fragment_wait_queue); + + if(!read_data(s, (char *) sBlk, SQUASHFS_START, sizeof(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) { + squashfs_super_block sblk; + WARNING("Mounting a different endian SQUASHFS filesystem on %s\n", bdevname(dev)); + SQUASHFS_SWAP_SUPER_BLOCK(&sblk, sBlk); + memcpy(sBlk, &sblk, sizeof(squashfs_super_block)); + msBlk->swap = 1; + } else { + SERROR("Can't find a SQUASHFS superblock on %s\n", bdevname(dev)); + goto failed_mount; + } + } + + /* Check the MAJOR & MINOR versions */ +#ifdef SQUASHFS_1_0_COMPATIBILITY + if((sBlk->s_major != 1) && (sBlk->s_major != 2 || sBlk->s_minor > SQUASHFS_MINOR)) { + SERROR("Major/Minor mismatch, filesystem is (%d:%d), I support (1 : x) or (2 : <= %d)\n", + sBlk->s_major, sBlk->s_minor, SQUASHFS_MINOR); + goto failed_mount; + } + if(sBlk->s_major == 1) + sBlk->block_size = sBlk->block_size_1; +#else + if(sBlk->s_major != SQUASHFS_MAJOR || sBlk->s_minor > SQUASHFS_MINOR) { + SERROR("Major/Minor mismatch, filesystem is (%d:%d), I support (%d: <= %d)\n", + sBlk->s_major, sBlk->s_minor, SQUASHFS_MAJOR, SQUASHFS_MINOR); + goto failed_mount; + } +#endif + + TRACE("Found valid superblock on %s\n", bdevname(dev)); + 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 %d 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 %x\n", sBlk->inode_table_start); + TRACE("sBlk->directory_table_start %x\n", sBlk->directory_table_start); + if(sBlk->s_major > 1) + TRACE("sBlk->fragment_table_start %x\n", sBlk->fragment_table_start); + TRACE("sBlk->uid_start %x\n", sBlk->uid_start); + + s->s_flags |= MS_RDONLY; + s->s_op = &squashfs_ops; + + /* Init inode_table block pointer array */ + if(!(msBlk->block_cache = (squashfs_cache *) kmalloc(sizeof(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 = (char *) kmalloc(msBlk->read_size, GFP_KERNEL))) { + ERROR("Failed to allocate read_data block\n"); + goto failed_mount1; + } + + /* Allocate read_page block */ + if(sBlk->block_size > PAGE_CACHE_SIZE) { + if(!(msBlk->read_page = (char *) kmalloc(sBlk->block_size, GFP_KERNEL))) { + ERROR("Failed to allocate read_page block\n"); + goto failed_mount2; + } + } else + msBlk->read_page = NULL; + + /* Allocate uid and gid tables */ + if(!(msBlk->uid = (squashfs_uid *) kmalloc((sBlk->no_uids + + sBlk->no_guids) * sizeof(squashfs_uid), GFP_KERNEL))) { + ERROR("Failed to allocate uid/gid table\n"); + goto failed_mount3; + } + msBlk->guid = msBlk->uid + sBlk->no_uids; + + if(msBlk->swap) { + squashfs_uid suid[sBlk->no_uids + sBlk->no_guids]; + + if(!read_data(s, (char *) &suid, sBlk->uid_start, ((sBlk->no_uids + sBlk->no_guids) * + sizeof(squashfs_uid)) | SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { + SERROR("unable to read uid/gid table\n"); + goto failed_mount4; + } + SQUASHFS_SWAP_DATA(msBlk->uid, suid, (sBlk->no_uids + sBlk->no_guids), (sizeof(squashfs_uid) * 8)); + } else + if(!read_data(s, (char *) msBlk->uid, sBlk->uid_start, ((sBlk->no_uids + sBlk->no_guids) * + sizeof(squashfs_uid)) | SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { + SERROR("unable to read uid/gid table\n"); + goto failed_mount4; + } + + +#ifdef SQUASHFS_1_0_COMPATIBILITY + if(sBlk->s_major == 1) { + msBlk->iget = squashfs_iget_1; + msBlk->read_blocklist = read_blocklist_1; + msBlk->fragment = NULL; + msBlk->fragment_index = NULL; + goto allocate_root; + } +#endif + msBlk->iget = squashfs_iget; + msBlk->read_blocklist = read_blocklist; + + if(!(msBlk->fragment = (struct squashfs_fragment_cache *) kmalloc(sizeof(struct squashfs_fragment_cache) * SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) { + ERROR("Failed to allocate fragment block cache\n"); + goto failed_mount4; + } + + 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->fragment_index = (squashfs_fragment_index *) kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments), GFP_KERNEL))) { + ERROR("Failed to allocate uid/gid table\n"); + goto failed_mount5; + } + + if(SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments) && + !read_data(s, (char *) msBlk->fragment_index, sBlk->fragment_table_start, + SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments) | SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) { + SERROR("unable to read fragment index table\n"); + goto failed_mount6; + } + + if(msBlk->swap) { + int i; + squashfs_fragment_index 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; + } + } + +#ifdef SQUASHFS_1_0_COMPATIBILITY +allocate_root: +#endif + if(!(s->s_root = d_alloc_root((msBlk->iget)(s, sBlk->root_inode)))) { + ERROR("Root inode create failed\n"); + goto failed_mount5; + } + + TRACE("Leaving squashfs_read_super\n"); + return s; + +failed_mount6: + kfree(msBlk->fragment_index); +failed_mount5: + kfree(msBlk->fragment); +failed_mount4: + kfree(msBlk->uid); +failed_mount3: + kfree(msBlk->read_page); +failed_mount2: + kfree(msBlk->read_data); +failed_mount1: + kfree(msBlk->block_cache); +failed_mount: + return NULL; +} + + +static int squashfs_statfs(struct super_block *s, struct statfs *buf) +{ + squashfs_super_block *sBlk = &s->u.squashfs_sb.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; + unsigned int block = inode->u.squashfs_i.start_block; + int offset = inode->u.squashfs_i.offset; + void *pageaddr = kmap(page); + + TRACE("Entered squashfs_symlink_readpage, page index %x, start block %x, offset %x\n", + (unsigned int) page->index, inode->u.squashfs_i.start_block, inode->u.squashfs_i.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 [%x:%x]\n", block, offset); + goto skip_read; + } + } + + if(length != index) { + ERROR("(squashfs_symlink_readpage) length != index\n"); + bytes = 0; + goto skip_read; + } + + bytes = (inode->i_size - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE : inode->i_size - length; + if(!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block, offset, bytes, &block, &offset))) + ERROR("Unable to read symbolic link [%x:%x]\n", block, offset); + +skip_read: + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); + kunmap(page); + flush_dcache_page(page); + SetPageUptodate(page); + UnlockPage(page); + + return 0; +} + + +#define SIZE 256 + +#ifdef SQUASHFS_1_0_COMPATIBILITY +static unsigned int read_blocklist_1(struct inode *inode, int index, int readahead_blks, + char *block_list, unsigned short **block_p, unsigned int *bsize) +{ + squashfs_sb_info *msBlk = &inode->i_sb->u.squashfs_sb; + unsigned short *block_listp; + int i = 0; + int block_ptr = inode->u.squashfs_i.block_list_start; + int offset = inode->u.squashfs_i.offset; + unsigned int block = inode->u.squashfs_i.start_block; + + for(;;) { + int blocks = (index + readahead_blks - i); + if(blocks > (SIZE >> 1)) { + if((index - i) <= (SIZE >> 1)) + blocks = index - i; + else + blocks = SIZE >> 1; + } + + if(msBlk->swap) { + unsigned char sblock_list[SIZE]; + if(!squashfs_get_cached_block(inode->i_sb, (char *) sblock_list, block_ptr, offset, blocks << 1, &block_ptr, &offset)) { + ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset); + return 0; + } + SQUASHFS_SWAP_SHORTS(((unsigned short *)block_list), ((unsigned short *)sblock_list), blocks); + } else + if(!squashfs_get_cached_block(inode->i_sb, (char *) block_list, block_ptr, offset, blocks << 1, &block_ptr, &offset)) { + ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset); + return 0; + } + for(block_listp = (unsigned short *) block_list; i < index && blocks; i ++, block_listp ++, blocks --) + block += SQUASHFS_COMPRESSED_SIZE(*block_listp); + if(blocks >= readahead_blks) + break; + } + + if(bsize) + *bsize = SQUASHFS_COMPRESSED_SIZE(*block_listp) | (!SQUASHFS_COMPRESSED(*block_listp) ? SQUASHFS_COMPRESSED_BIT_BLOCK : 0); + else + *block_p = block_listp; + return block; +} +#endif + + + +static unsigned int read_blocklist(struct inode *inode, int index, int readahead_blks, + char *block_list, unsigned short **block_p, unsigned int *bsize) +{ + squashfs_sb_info *msBlk = &inode->i_sb->u.squashfs_sb; + unsigned int *block_listp; + int i = 0; + int block_ptr = inode->u.squashfs_i.block_list_start; + int offset = inode->u.squashfs_i.offset; + unsigned int block = inode->u.squashfs_i.start_block; + + for(;;) { + int blocks = (index + readahead_blks - i); + if(blocks > (SIZE >> 2)) { + if((index - i) <= (SIZE >> 2)) + blocks = index - i; + else + blocks = SIZE >> 2; + } + + if(msBlk->swap) { + unsigned char sblock_list[SIZE]; + if(!squashfs_get_cached_block(inode->i_sb, (char *) sblock_list, block_ptr, offset, blocks << 2, &block_ptr, &offset)) { + ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset); + return 0; + } + SQUASHFS_SWAP_INTS(((unsigned int *)block_list), ((unsigned int *)sblock_list), blocks); + } else + if(!squashfs_get_cached_block(inode->i_sb, (char *) block_list, block_ptr, offset, blocks << 2, &block_ptr, &offset)) { + ERROR("Unable to read block list [%d:%x]\n", block_ptr, offset); + return 0; + } + for(block_listp = (unsigned int *) block_list; i < index && blocks; i ++, block_listp ++, blocks --) + block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp); + if(blocks >= readahead_blks) + break; + } + + *bsize = *block_listp; + return block; +} + + +static int squashfs_readpage(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + squashfs_sb_info *msBlk = &inode->i_sb->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + unsigned char block_list[SIZE]; + unsigned int bsize, block, i = 0, bytes = 0, byte_offset = 0; + int index = page->index >> (sBlk->block_log - PAGE_CACHE_SHIFT); + void *pageaddr = kmap(page); + 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 %x, start block %x\n", (unsigned int) page->index, + inode->u.squashfs_i.start_block); + + if(page->index >= ((inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)) { + goto skip_read; + } + + if(inode->u.squashfs_i.u.s1.fragment_start_block == SQUASHFS_INVALID_BLK || index < (inode->i_size >> 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 = read_data(inode->i_sb, msBlk->read_page, block, bsize, NULL))) { + ERROR("Unable to read page, block %x, size %x\n", block, bsize); + up(&msBlk->read_page_mutex); + goto skip_read; + } + } else { + if((fragment = get_cached_fragment(inode->i_sb, inode->u.squashfs_i.u.s1.fragment_start_block, inode->u.squashfs_i.u.s1.fragment_size)) == NULL) { + ERROR("Unable to read page, block %x, size %x\n", inode->u.squashfs_i.u.s1.fragment_start_block, (int) inode->u.squashfs_i.u.s1.fragment_size); + goto skip_read; + } + bytes = inode->u.squashfs_i.u.s1.fragment_offset + (inode->i_size & (sBlk->block_size - 1)); + byte_offset = inode->u.squashfs_i.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) { + memcpy(pageaddr, data_ptr + byte_offset, available_bytes); + memset(pageaddr + available_bytes, 0, PAGE_CACHE_SIZE - available_bytes); + kunmap(page); + flush_dcache_page(page); + SetPageUptodate(page); + UnlockPage(page); + } else if((push_page = grab_cache_page_nowait(page->mapping, i))) { + void *pageaddr = kmap(push_page); + memcpy(pageaddr, data_ptr + byte_offset, available_bytes); + memset(pageaddr + available_bytes, 0, PAGE_CACHE_SIZE - available_bytes); + kunmap(push_page); + flush_dcache_page(push_page); + SetPageUptodate(push_page); + UnlockPage(push_page); + page_cache_release(push_page); + } + } + + if(inode->u.squashfs_i.u.s1.fragment_start_block == SQUASHFS_INVALID_BLK || index < (inode->i_size >> sBlk->block_log)) + up(&msBlk->read_page_mutex); + else + release_cached_fragment(msBlk, fragment); + + return 0; + +skip_read: + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); + kunmap(page); + flush_dcache_page(page); + SetPageUptodate(page); + UnlockPage(page); + + return 0; +} + + +static int squashfs_readpage4K(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + squashfs_sb_info *msBlk = &inode->i_sb->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + unsigned char block_list[SIZE]; + unsigned int bsize, block, bytes = 0; + void *pageaddr = kmap(page); + + TRACE("Entered squashfs_readpage4K, page index %x, start block %x\n", (unsigned int) page->index, + inode->u.squashfs_i.start_block); + + if(page->index >= ((inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)) { + goto skip_read; + } + + if(inode->u.squashfs_i.u.s1.fragment_start_block == SQUASHFS_INVALID_BLK || page->index < (inode->i_size >> sBlk->block_log)) { + block = (msBlk->read_blocklist)(inode, page->index, 1, block_list, NULL, &bsize); + + if(!(bytes = read_data(inode->i_sb, pageaddr, block, bsize, NULL))) + ERROR("Unable to read page, block %x, size %x\n", block, bsize); + } else { + struct squashfs_fragment_cache *fragment; + + if((fragment = get_cached_fragment(inode->i_sb, inode->u.squashfs_i.u.s1.fragment_start_block, inode->u.squashfs_i.u.s1.fragment_size)) == NULL) + ERROR("Unable to read page, block %x, size %x\n", inode->u.squashfs_i.u.s1.fragment_start_block, (int) inode->u.squashfs_i.u.s1.fragment_size); + else { + bytes = inode->i_size & (sBlk->block_size - 1); + memcpy(pageaddr, fragment->data + inode->u.squashfs_i.u.s1.fragment_offset, bytes); + release_cached_fragment(msBlk, fragment); + } + } + +skip_read: + memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes); + kunmap(page); + flush_dcache_page(page); + SetPageUptodate(page); + UnlockPage(page); + + return 0; +} + + +#ifdef SQUASHFS_1_0_COMPATIBILITY +static int squashfs_readpage_lessthan4K(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + squashfs_sb_info *msBlk = &inode->i_sb->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + unsigned char block_list[SIZE]; + unsigned short *block_listp, block, bytes = 0; + int index = page->index << (PAGE_CACHE_SHIFT - sBlk->block_log); + int file_blocks = ((inode->i_size - 1) >> sBlk->block_log) + 1; + int readahead_blks = 1 << (PAGE_CACHE_SHIFT - sBlk->block_log); + void *pageaddr = kmap(page); + + int i_end = index + (1 << (PAGE_CACHE_SHIFT - sBlk->block_log)); + int byte; + + TRACE("Entered squashfs_readpage_lessthan4K, page index %x, start block %x\n", (unsigned int) page->index, + inode->u.squashfs_i.start_block); + + block = read_blocklist_1(inode, index, readahead_blks, block_list, &block_listp, NULL); + + if(i_end > file_blocks) + i_end = file_blocks; + + while(index < i_end) { + int c_byte = !SQUASHFS_COMPRESSED(*block_listp) ? SQUASHFS_COMPRESSED_SIZE(*block_listp) | SQUASHFS_COMPRESSED_BIT_BLOCK : *block_listp; + if(!(byte = read_data(inode->i_sb, pageaddr, block, c_byte, NULL))) { + ERROR("Unable to read page, block %x, size %x\n", block, *block_listp); + goto skip_read; + } + block += SQUASHFS_COMPRESSED_SIZE(*block_listp); + pageaddr += byte; + bytes += byte; + index ++; + block_listp ++; + } + +skip_read: + memset(pageaddr, 0, PAGE_CACHE_SIZE - bytes); + kunmap(page); + flush_dcache_page(page); + SetPageUptodate(page); + UnlockPage(page); + + return 0; +} +#endif + + +static int get_dir_index_using_offset(struct super_block *s, unsigned int *next_block, + unsigned int *next_offset, unsigned int index_start, unsigned int index_offset, + int i_count, long long f_pos) +{ + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + int i, length = 0; + squashfs_dir_index 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) + return 0; + + for(i = 0; i < i_count; i++) { + if(msBlk->swap) { + 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; + return length; +} + + +static int get_dir_index_using_name(struct super_block *s, unsigned int *next_block, + unsigned int *next_offset, unsigned int index_start, unsigned int index_offset, + int i_count, const char *name, int size) +{ + squashfs_sb_info *msBlk = &s->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + int i, length = 0; + char buffer[sizeof(squashfs_dir_index) + SQUASHFS_NAME_LEN + 1]; + squashfs_dir_index *index = (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) { + 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(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; +} + + +static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir) +{ + struct inode *i = file->f_dentry->d_inode; + squashfs_sb_info *msBlk = &i->i_sb->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + int next_block = i->u.squashfs_i.start_block + sBlk->directory_table_start, next_offset = + i->u.squashfs_i.offset, length = 0, dirs_read = 0, dir_count; + squashfs_dir_header dirh; + char buffer[sizeof(squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1]; + squashfs_dir_entry *dire = (squashfs_dir_entry *) buffer; + + TRACE("Entered squashfs_readdir [%x:%x]\n", next_block, next_offset); + + length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset, i->u.squashfs_i.u.s2.directory_index_start, + i->u.squashfs_i.u.s2.directory_index_offset, i->u.squashfs_i.u.s2.directory_index_count, file->f_pos); + + while(length < i->i_size) { + /* read directory header */ + if(msBlk->swap) { + 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) { + 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)\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"); + return dirs_read; + } + + file->f_pos = length; + dirs_read ++; + } + } + + return dirs_read; + +failed_read: + ERROR("Unable to read directory block [%x:%x]\n", next_block, next_offset); + return 0; +} + + +static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry) +{ + const char *name =dentry->d_name.name; + int len = dentry->d_name.len; + struct inode *inode = NULL; + squashfs_sb_info *msBlk = &i->i_sb->u.squashfs_sb; + squashfs_super_block *sBlk = &msBlk->sBlk; + int next_block = i->u.squashfs_i.start_block + sBlk->directory_table_start, next_offset = + i->u.squashfs_i.offset, length = 0, dir_count; + squashfs_dir_header dirh; + char buffer[sizeof(squashfs_dir_entry) + SQUASHFS_NAME_LEN]; + squashfs_dir_entry *dire = (squashfs_dir_entry *) buffer; + int squashfs_2_1 = sBlk->s_major == 2 && sBlk->s_minor == 1; + + TRACE("Entered squashfs_lookup [%x:%x]\n", next_block, next_offset); + + length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset, i->u.squashfs_i.u.s2.directory_index_start, + i->u.squashfs_i.u.s2.directory_index_offset, i->u.squashfs_i.u.s2.directory_index_count, name, len); + + while(length < i->i_size) { + /* read directory header */ + if(msBlk->swap) { + 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) { + 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(squashfs_2_1 && name[0] < dire->name[0]) + goto exit_loop; + + if((len == dire->size + 1) && !strncmp(name, dire->name, len)) { + squashfs_inode ino = SQUASHFS_MKINODE(dirh.start_block, dire->offset); + + TRACE("calling squashfs_iget for directory entry %s, inode %x:%x\n", + name, dirh.start_block, dire->offset); + + 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 [%x:%x]\n", next_block, next_offset); + goto exit_loop; +} + + +static void squashfs_put_super(struct super_block *s) +{ + int i; + + squashfs_sb_info *sbi = (squashfs_sb_info *) &s->u.squashfs_sb; + 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); + kfree(sbi->block_cache); + } + if(sbi->read_data) kfree(sbi->read_data); + if(sbi->read_page) kfree(sbi->read_page); + if(sbi->uid) kfree(sbi->uid); + if(sbi->fragment) { + for(i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) + if(sbi->fragment[i].data != NULL) + kfree(sbi->fragment[i].data); + kfree(sbi->fragment); + } + if(sbi->fragment_index) kfree(sbi->fragment_index); + sbi->block_cache = NULL; + sbi->uid = NULL; + sbi->read_data = NULL; + sbi->read_page = NULL; + sbi->fragment = NULL; + sbi->fragment_index = NULL; +} + + +static int __init init_squashfs_fs(void) +{ + + printk(KERN_INFO "Squashfs 2.1-r2 (released 2004/12/15) (C) 2002-2004 Phillip Lougher\n"); + + if(!(stream.workspace = (char *) vmalloc(zlib_inflate_workspacesize()))) { + ERROR("Failed to allocate zlib workspace\n"); + return -ENOMEM; + } + return register_filesystem(&squashfs_fs_type); +} + + +static void __exit exit_squashfs_fs(void) +{ + vfree(stream.workspace); + unregister_filesystem(&squashfs_fs_type); +} + + +EXPORT_NO_SYMBOLS; + +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"); diff --new-file -ur linux-2.4.28/fs/squashfs/Makefile linux-2.4.28-squashfs2.1-r2/fs/squashfs/Makefile --- linux-2.4.28/fs/squashfs/Makefile 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.28-squashfs2.1-r2/fs/squashfs/Makefile 2004-12-02 02:14:05.000000000 +0000 @@ -0,0 +1,11 @@ +# +# Makefile for the linux squashfs routines. +# + +O_TARGET := squashfs.o + +obj-y := inode.o + +obj-m := $(O_TARGET) + +include $(TOPDIR)/Rules.make diff --new-file -ur linux-2.4.28/include/linux/fs.h linux-2.4.28-squashfs2.1-r2/include/linux/fs.h --- linux-2.4.28/include/linux/fs.h 2004-11-17 11:54:22.000000000 +0000 +++ linux-2.4.28-squashfs2.1-r2/include/linux/fs.h 2004-12-02 02:14:05.000000000 +0000 @@ -324,6 +324,7 @@ #include #include #include +#include /* * Attribute flags. These should be or-ed together to figure out what @@ -519,6 +520,7 @@ struct socket socket_i; struct usbdev_inode_info usbdev_i; struct jffs2_inode_info jffs2_i; + struct squashfs_inode_info squashfs_i; void *generic_ip; } u; }; @@ -733,6 +735,7 @@ #include #include #include +#include extern struct list_head super_blocks; extern spinlock_t sb_lock; @@ -792,6 +795,7 @@ struct usbdev_sb_info usbdevfs_sb; struct jffs2_sb_info jffs2_sb; struct cramfs_sb_info cramfs_sb; + struct squashfs_sb_info squashfs_sb; void *generic_sbp; } u; /* diff --new-file -ur linux-2.4.28/include/linux/squashfs_fs.h linux-2.4.28-squashfs2.1-r2/include/linux/squashfs_fs.h --- linux-2.4.28/include/linux/squashfs_fs.h 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.4.28-squashfs2.1-r2/include/linux/squashfs_fs.h 2004-12-02 02:52:36.000000000 +0000 @@ -0,0 +1,512 @@ +#ifndef SQUASHFS_FS +#define SQUASHFS_FS +/* + * Squashfs + * + * Copyright (c) 2002, 2003, 2004 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 + */ + +#define SQUASHFS_MAJOR 2 +#define SQUASHFS_MINOR 1 +#define SQUASHFS_MAGIC 0x73717368 +#define SQUASHFS_MAGIC_SWAP 0x68737173 +#define SQUASHFS_START 0 + +/* size of metadata (inode and directory) blocks */ +#define SQUASHFS_METADATA_SIZE 8192 +#define SQUASHFS_METADATA_LOG 13 + +/* default size of data blocks */ +#define SQUASHFS_FILE_SIZE 65536 +#define SQUASHFS_FILE_LOG 16 + +#define SQUASHFS_FILE_MAX_SIZE 65536 + +/* Max number of uids and gids */ +#define SQUASHFS_UIDS 256 +#define SQUASHFS_GUIDS 255 + +/* Max length of filename (not 255) */ +#define SQUASHFS_NAME_LEN 256 + +#define SQUASHFS_INVALID ((long long) 0xffffffffffff) +#define SQUASHFS_INVALID_BLK ((long long) 0xffffffff) +#define SQUASHFS_USED_BLK ((long long) 0xfffffffe) + +/* 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 + +/* 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)(((squashfs_inode) (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)) + +/* Translate between VFS mode and squashfs mode */ +#define SQUASHFS_MODE(a) ((a) & 0xfff) + +/* fragment and fragment table defines */ +typedef unsigned int squashfs_fragment_index; +#define SQUASHFS_FRAGMENT_BYTES(A) (A * sizeof(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(squashfs_fragment_index)) +#define SQUASHFS_CACHED_FRAGMENTS 3 + +/* cached data constants for filesystem */ +#define SQUASHFS_CACHED_BLKS 8 + +#define SQUASHFS_MAX_FILE_SIZE_LOG 32 +#define SQUASHFS_MAX_FILE_SIZE ((long long) 1