diff --new-file -urp linux-2.6.11.3/fs/squashfs/inode.c linux-2.6.11.3-squashfs/fs/squashfs/inode.c --- linux-2.6.11.3/fs/squashfs/inode.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.11.3-squashfs/fs/squashfs/inode.c 2005-03-14 00:53:28.037568088 +0000 @@ -0,0 +1,1784 @@ +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004, 2005 + * 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 super_block *, struct kstatfs *); +static int squashfs_symlink_readpage(struct file *file, struct page *page); +static int squashfs_readpage(struct file *file, struct page *page); +static int squashfs_readpage4K(struct file *file, struct page *page); +static int squashfs_readdir(struct file *, void *, filldir_t); +static void squashfs_put_super(struct super_block *s); +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 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 struct super_block *squashfs_get_sb(struct file_system_type *, int, + const char *, void *); + +DECLARE_MUTEX(read_data_mutex); + +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, +}; + +struct address_space_operations squashfs_symlink_aops = { + .readpage = squashfs_symlink_readpage +}; + +struct address_space_operations squashfs_aops = { + .readpage = squashfs_readpage +}; + +struct address_space_operations squashfs_aops_4K = { + .readpage = squashfs_readpage4K +}; + +struct file_operations squashfs_dir_ops = { + .read = generic_read_dir, + .readdir = squashfs_readdir +}; + +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 = (squashfs_sb_info *)s->s_fs_info; + 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 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)))) + 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; +} + + +unsigned int squashfs_read_data(struct super_block *s, char *buffer, + unsigned int index, unsigned int length, + unsigned int *next_index) +{ + squashfs_sb_info *msBlk = (squashfs_sb_info *)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%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]); + 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(&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; +} + + +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 = (squashfs_sb_info *)s->s_fs_info; + 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) { + 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 = + (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 = + squashfs_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 = (squashfs_sb_info *)s->s_fs_info; + 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; +} + + +static 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); +} + + +static struct squashfs_fragment_cache *get_cached_fragment(struct super_block + *s, unsigned int start_block, + int length) +{ + int i, n; + squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info; + + 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) { + 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 = + (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 = squashfs_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]; + } +} + + +static struct inode *squashfs_new_inode(struct super_block *s, + squashfs_base_inode_header *inodeb, unsigned int ino) +{ + squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info; + 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(struct super_block *s, squashfs_inode inode) +{ + struct inode *i; + squashfs_sb_info *msBlk = (squashfs_sb_info *)s->s_fs_info; + 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); + 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; + + switch(inodeb.inode_type) { + case SQUASHFS_FILE_TYPE: { + squashfs_reg_inode_header inodep; + unsigned int frag_blk, frag_size; + + 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; + + frag_blk = SQUASHFS_INVALID_BLK; + if (inodep.fragment != SQUASHFS_INVALID_BLK && + !get_fragment_location(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)->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 %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 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; + + 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; + i->i_fop = &squashfs_dir_ops; + 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; + + 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; + + 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; + i->i_fop = &squashfs_dir_ops; + 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; + + 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; + + 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 %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; + + 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 supported_squashfs_filesystem(squashfs_sb_info *msBlk, int silent) +{ + squashfs_super_block *sBlk = &msBlk->sBlk; + + 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 != 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; + } else { + msBlk->iget = squashfs_iget; + msBlk->read_blocklist = read_blocklist; + } + + return 1; +} + + +static int squashfs_fill_super(struct super_block *s, void *data, int silent) +{ + squashfs_sb_info *msBlk; + squashfs_super_block *sBlk; + int i; + char b[BDEVNAME_SIZE]; + struct inode *root; + + TRACE("Entered squashfs_read_superblock\n"); + + if (!(s->s_fs_info = (void *) kmalloc(sizeof(squashfs_sb_info), + GFP_KERNEL))) { + ERROR("Failed to allocate superblock\n"); + return -ENOMEM; + } + memset(s->s_fs_info, 0, sizeof(squashfs_sb_info)); + msBlk = (squashfs_sb_info *) 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_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 (!squashfs_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(s->s_bdev, b)); + + 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(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 %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_mount; + } + + /* 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_mount; + } + } 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_mount; + } + msBlk->guid = msBlk->uid + sBlk->no_uids; + + if (msBlk->swap) { + squashfs_uid suid[sBlk->no_uids + sBlk->no_guids]; + + if (!squashfs_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_mount; + } + + SQUASHFS_SWAP_DATA(msBlk->uid, suid, (sBlk->no_uids + + sBlk->no_guids), (sizeof(squashfs_uid) * 8)); + } else + if (!squashfs_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_mount; + } + + + if (sBlk->s_major == 1 && squashfs_1_0_supported(msBlk)) + goto allocate_root; + + 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_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->fragment_index = (squashfs_fragment_index *) + kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES + (sBlk->fragments), GFP_KERNEL))) { + ERROR("Failed to allocate uid/gid table\n"); + goto failed_mount; + } + + 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)) { + SERROR("unable to read fragment index table\n"); + goto failed_mount; + } + + 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; + } + } + +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(s->s_fs_info); + s->s_fs_info = NULL; + return -EINVAL; +} + + +static int squashfs_statfs(struct super_block *s, struct kstatfs *buf) +{ + squashfs_super_block *sBlk = &((squashfs_sb_info *)s->s_fs_info)->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 = SQUASHFS_I(inode)->start_block; + int offset = SQUASHFS_I(inode)->offset; + void *pageaddr = kmap(page); + + TRACE("Entered squashfs_symlink_readpage, page index %d, start block " + "%x, 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 [%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); + unlock_page(page); + + return 0; +} + + +#define SIZE 256 + +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 = (squashfs_sb_info *)inode->i_sb->s_fs_info; + unsigned int *block_listp; + int i = 0; + int block_ptr = SQUASHFS_I(inode)->block_list_start; + int offset = SQUASHFS_I(inode)->offset; + unsigned int block = SQUASHFS_I(inode)->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 = (squashfs_sb_info *)inode->i_sb->s_fs_info; + 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, + SQUASHFS_I(inode)->start_block); + + if (page->index >= ((inode->i_size + PAGE_CACHE_SIZE - 1) >> + PAGE_CACHE_SHIFT)) { + goto skip_read; + } + + if (SQUASHFS_I(inode)->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 = squashfs_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, + SQUASHFS_I(inode)-> + u.s1.fragment_start_block, + SQUASHFS_I(inode)->u.s1.fragment_size)) + == NULL) { + ERROR("Unable to read page, block %x, 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 + + (inode->i_size & (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) { + 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); + unlock_page(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); + unlock_page(push_page); + page_cache_release(push_page); + } + } + + if (SQUASHFS_I(inode)->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); + unlock_page(page); + + return 0; +} + + +static int squashfs_readpage4K(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + squashfs_sb_info *msBlk = (squashfs_sb_info *)inode->i_sb->s_fs_info; + 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, + SQUASHFS_I(inode)->start_block); + + if (page->index >= ((inode->i_size + PAGE_CACHE_SIZE - 1) >> + PAGE_CACHE_SHIFT)) { + goto skip_read; + } + + if (SQUASHFS_I(inode)->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 = squashfs_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, + SQUASHFS_I(inode)-> + u.s1.fragment_start_block, + SQUASHFS_I(inode)-> u.s1.fragment_size)) + == NULL) + ERROR("Unable to read page, block %x, size %x\n", + SQUASHFS_I(inode)-> + u.s1.fragment_start_block, (int) + SQUASHFS_I(inode)-> u.s1.fragment_size); + else { + bytes = inode->i_size & (sBlk->block_size - 1); + memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)-> + 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); + unlock_page(page); + + return 0; +} + + +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 = (squashfs_sb_info *)s->s_fs_info; + 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 = (squashfs_sb_info *)s->s_fs_info; + 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 = (squashfs_sb_info *)i->i_sb->s_fs_info; + squashfs_super_block *sBlk = &msBlk->sBlk; + int next_block = SQUASHFS_I(i)->start_block + + sBlk->directory_table_start, + next_offset = SQUASHFS_I(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, + 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->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, + struct nameidata *nd) +{ + const unsigned char *name = dentry->d_name.name; + int len = dentry->d_name.len; + struct inode *inode = NULL; + squashfs_sb_info *msBlk = (squashfs_sb_info *)i->i_sb->s_fs_info; + squashfs_super_block *sBlk = &msBlk->sBlk; + int next_block = SQUASHFS_I(i)->start_block + + sBlk->directory_table_start, + next_offset = SQUASHFS_I(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 sorted = 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, + 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->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 (sorted && 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; + + if (s->s_fs_info) { + squashfs_sb_info *sbi = (squashfs_sb_info *) 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++) + kfree(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(s->s_fs_info); + s->s_fs_info = NULL; + } +} + + +static struct super_block *squashfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super); +} + + +static int __init init_squashfs_fs(void) +{ + int err = init_inodecache(); + if (err) + return err; + + printk(KERN_INFO "squashfs: version 2.1 (2005/03/14) " + "Phillip Lougher\n"); + + if (!(stream.workspace = (char *) + vmalloc(zlib_inflate_workspacesize()))) { + ERROR("Failed to allocate zlib workspace\n"); + destroy_inodecache(); + return -ENOMEM; + } + + if ((err = register_filesystem(&squashfs_fs_type))) { + vfree(stream.workspace); + destroy_inodecache(); + } + + return err; +} + + +static void __exit exit_squashfs_fs(void) +{ + vfree(stream.workspace); + unregister_filesystem(&squashfs_fs_type); + destroy_inodecache(); +} + + +static kmem_cache_t * squashfs_inode_cachep; + + +static struct inode *squashfs_alloc_inode(struct super_block *sb) +{ + struct squashfs_inode_info *ei; + ei = (struct squashfs_inode_info *) + kmem_cache_alloc(squashfs_inode_cachep, SLAB_KERNEL); + if (!ei) + return NULL; + return &ei->vfs_inode; +} + + +static void squashfs_destroy_inode(struct inode *inode) +{ + kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode)); +} + + +static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) +{ + struct squashfs_inode_info *ei = (struct squashfs_inode_info *) foo; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) + inode_init_once(&ei->vfs_inode); +} + + +static int init_inodecache(void) +{ + squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", + sizeof(struct squashfs_inode_info), + 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT, + init_once, NULL); + if (squashfs_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + + +static void destroy_inodecache(void) +{ + if (kmem_cache_destroy(squashfs_inode_cachep)) + printk(KERN_INFO "squashfs_inode_cache: not all structures " + "were freed\n"); +} + + +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");