--- /dev/null
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005 Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * inode.c
+ */
+
+#define SQUASHFS_1_0_COMPATIBILITY
+
+#include <linux/types.h>
+#include <linux/squashfs_fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/squashfs_fs_i.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/init.h>
+#include <linux/dcache.h>
+#include <asm/uaccess.h>
+#include <linux/wait.h>
+#include <asm/semaphore.h>
+#include <linux/zlib.h>
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+
+#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 void squashfs_put_super(struct super_block *);
+static int squashfs_statfs(struct super_block *, struct kstatfs *);
+static int squashfs_symlink_readpage(struct file *file, struct page *page);
+static int squashfs_readpage(struct file *file, struct page *page);
+static int squashfs_readpage4K(struct file *file, struct page *page);
+static int squashfs_readdir(struct file *, void *, filldir_t);
+static struct dentry *squashfs_lookup(struct inode *, struct dentry *, struct nameidata *);
+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);
+static struct super_block *squashfs_get_sb(struct file_system_type *, int, const char *, void *);
+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);
+
+#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 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,
+};
+
+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 inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
+{
+ return list_entry(inode, struct squashfs_inode_info, vfs_inode);
+}
+
+
+static struct buffer_head *get_block_length(struct super_block *s,
+ int *cur_index, int *offset, int *c_byte)
+{
+ squashfs_sb_info *msblk = s->s_fs_info;
+ unsigned short temp;
+ struct buffer_head *bh;
+
+ if (!(bh = sb_bread(s, *cur_index)))
+ goto out;
+
+ if (msblk->devblksize - *offset == 1) {
+ if (msblk->swap)
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ (bh->b_data + *offset));
+ else
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ (bh->b_data + *offset));
+ brelse(bh);
+ if (!(bh = sb_bread(s, ++(*cur_index))))
+ goto out;
+ if (msblk->swap)
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ bh->b_data);
+ else
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ bh->b_data);
+ *c_byte = temp;
+ *offset = 1;
+ } else {
+ if (msblk->swap) {
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ (bh->b_data + *offset));
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ (bh->b_data + *offset + 1));
+ } else {
+ ((unsigned char *) &temp)[0] = *((unsigned char *)
+ (bh->b_data + *offset));
+ ((unsigned char *) &temp)[1] = *((unsigned char *)
+ (bh->b_data + *offset + 1));
+ }
+ *c_byte = temp;
+ *offset += 2;
+ }
+
+ if (SQUASHFS_CHECK_DATA(msblk->sBlk.flags)) {
+ if (*offset == msblk->devblksize) {
+ brelse(bh);
+ if (!(bh = sb_bread(s, ++(*cur_index))))
+ goto out;
+ *offset = 0;
+ }
+ if (*((unsigned char *) (bh->b_data + *offset)) !=
+ SQUASHFS_MARKER_BYTE) {
+ ERROR("Metadata block marker corrupt @ %x\n",
+ *cur_index);
+ brelse(bh);
+ goto out;
+ }
+ (*offset)++;
+ }
+ return bh;
+
+out:
+ return NULL;
+}
+
+
+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 = (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;
+}
+
+
+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 = (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);
+ up(&msBlk->block_cache_mutex);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ 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 = 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;
+}
+
+
+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 = (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);
+ up(&msBlk->fragment_mutex);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ 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 *)
+ SQUASHFS_ALLOC(SQUASHFS_FILE_MAX_SIZE))) {
+ 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 = (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 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.tv_sec = sBlk->mkfs_time;
+ i->i_atime.tv_sec = sBlk->mkfs_time;
+ i->i_ctime.tv_sec = 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.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 = SQUASHFS_INVALID_BLK;
+ SQUASHFS_I(i)->u.s1.fragment_offset = 0;
+ SQUASHFS_I(i)->start_block = inodep.start_block;
+ SQUASHFS_I(i)->block_list_start = next_block;
+ SQUASHFS_I(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.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_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;
+ 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_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, old_decode_dev(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 = (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 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.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_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;
+
+ SQUASHFS_I(i)->u.s1.fragment_start_block = SQUASHFS_INVALID_BLK;
+ if(inodep.fragment != SQUASHFS_INVALID_BLK && !get_fragment_location(s, inodep.fragment,
+ &SQUASHFS_I(i)->u.s1.fragment_start_block, &SQUASHFS_I(i)->u.s1.fragment_size))
+ goto failed_read;
+
+ SQUASHFS_I(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.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)->start_block = inodep.start_block;
+ SQUASHFS_I(i)->block_list_start = next_block;
+ SQUASHFS_I(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 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.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;
+
+ 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;
+
+ 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;
+
+ i->i_size = 0;
+ 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: {
+ 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 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];
+
+ 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;
+ }
+ 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(!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 */
+#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(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_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 0;
+
+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:
+ 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
+
+#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 = (squashfs_sb_info *)inode->i_sb->s_fs_info;
+ unsigned short *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 >> 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 = (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 = 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 = 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;
+}
+
+
+#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 = (squashfs_sb_info *)inode->i_sb->s_fs_info;
+ 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,
+ SQUASHFS_I(inode)->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);
+ unlock_page(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 = (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);
+
+ lock_kernel();
+
+ 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");
+ unlock_kernel();
+ return dirs_read;
+ }
+
+ file->f_pos = length;
+ dirs_read ++;
+ }
+ }
+
+ unlock_kernel();
+ return dirs_read;
+
+failed_read:
+ unlock_kernel();
+ 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 squashfs_2_1 = sBlk->s_major == 2 && sBlk->s_minor == 1;
+
+ TRACE("Entered squashfs_lookup [%x:%x]\n", next_block, next_offset);
+
+ lock_kernel();
+
+ 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(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);
+ unlock_kernel();
+ 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);
+ 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)
+ SQUASHFS_FREE(sbi->fragment[i].data);
+ kfree(sbi->fragment);
+ }
+ if(sbi->fragment_index) 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 2.2-r2 (released 2005/09/08) (C) 2002-2005 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 <phillip@lougher.demon.co.uk>");
+MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff