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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /fs/squashfs/super.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/squashfs/super.c')
-rw-r--r--fs/squashfs/super.c698
1 files changed, 698 insertions, 0 deletions
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
new file mode 100644
index 0000000000..22e812808e
--- /dev/null
+++ b/fs/squashfs/super.c
@@ -0,0 +1,698 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * super.c
+ */
+
+/*
+ * This file implements code to read the superblock, read and initialise
+ * in-memory structures at mount time, and all the VFS glue code to register
+ * the filesystem.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/blkdev.h>
+#include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+#include <linux/vfs.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/seq_file.h>
+#include <linux/pagemap.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/magic.h>
+#include <linux/xattr.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "squashfs_fs_i.h"
+#include "squashfs.h"
+#include "decompressor.h"
+#include "xattr.h"
+
+static struct file_system_type squashfs_fs_type;
+static const struct super_operations squashfs_super_ops;
+
+enum Opt_errors {
+ Opt_errors_continue,
+ Opt_errors_panic,
+};
+
+enum squashfs_param {
+ Opt_errors,
+ Opt_threads,
+};
+
+struct squashfs_mount_opts {
+ enum Opt_errors errors;
+ const struct squashfs_decompressor_thread_ops *thread_ops;
+ int thread_num;
+};
+
+static const struct constant_table squashfs_param_errors[] = {
+ {"continue", Opt_errors_continue },
+ {"panic", Opt_errors_panic },
+ {}
+};
+
+static const struct fs_parameter_spec squashfs_fs_parameters[] = {
+ fsparam_enum("errors", Opt_errors, squashfs_param_errors),
+ fsparam_string("threads", Opt_threads),
+ {}
+};
+
+
+static int squashfs_parse_param_threads_str(const char *str, struct squashfs_mount_opts *opts)
+{
+#ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT
+ if (strcmp(str, "single") == 0) {
+ opts->thread_ops = &squashfs_decompressor_single;
+ return 0;
+ }
+ if (strcmp(str, "multi") == 0) {
+ opts->thread_ops = &squashfs_decompressor_multi;
+ return 0;
+ }
+ if (strcmp(str, "percpu") == 0) {
+ opts->thread_ops = &squashfs_decompressor_percpu;
+ return 0;
+ }
+#endif
+ return -EINVAL;
+}
+
+static int squashfs_parse_param_threads_num(const char *str, struct squashfs_mount_opts *opts)
+{
+#ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS
+ int ret;
+ unsigned long num;
+
+ ret = kstrtoul(str, 0, &num);
+ if (ret != 0)
+ return -EINVAL;
+ if (num > 1) {
+ opts->thread_ops = &squashfs_decompressor_multi;
+ if (num > opts->thread_ops->max_decompressors())
+ return -EINVAL;
+ opts->thread_num = (int)num;
+ return 0;
+ }
+#ifdef CONFIG_SQUASHFS_DECOMP_SINGLE
+ if (num == 1) {
+ opts->thread_ops = &squashfs_decompressor_single;
+ opts->thread_num = 1;
+ return 0;
+ }
+#endif
+#endif /* !CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS */
+ return -EINVAL;
+}
+
+static int squashfs_parse_param_threads(const char *str, struct squashfs_mount_opts *opts)
+{
+ int ret = squashfs_parse_param_threads_str(str, opts);
+
+ if (ret == 0)
+ return ret;
+ return squashfs_parse_param_threads_num(str, opts);
+}
+
+static int squashfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct squashfs_mount_opts *opts = fc->fs_private;
+ struct fs_parse_result result;
+ int opt;
+
+ opt = fs_parse(fc, squashfs_fs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_errors:
+ opts->errors = result.uint_32;
+ break;
+ case Opt_threads:
+ if (squashfs_parse_param_threads(param->string, opts) != 0)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct squashfs_decompressor *supported_squashfs_filesystem(
+ struct fs_context *fc,
+ short major, short minor, short id)
+{
+ const struct squashfs_decompressor *decompressor;
+
+ if (major < SQUASHFS_MAJOR) {
+ errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d "
+ "filesystems are unsupported", major, minor);
+ return NULL;
+ } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) {
+ errorf(fc, "Major/Minor mismatch, trying to mount newer "
+ "%d.%d filesystem", major, minor);
+ errorf(fc, "Please update your kernel");
+ return NULL;
+ }
+
+ decompressor = squashfs_lookup_decompressor(id);
+ if (!decompressor->supported) {
+ errorf(fc, "Filesystem uses \"%s\" compression. This is not supported",
+ decompressor->name);
+ return NULL;
+ }
+
+ return decompressor;
+}
+
+
+static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+ struct squashfs_mount_opts *opts = fc->fs_private;
+ struct squashfs_sb_info *msblk;
+ struct squashfs_super_block *sblk = NULL;
+ struct inode *root;
+ long long root_inode;
+ unsigned short flags;
+ unsigned int fragments;
+ u64 lookup_table_start, xattr_id_table_start, next_table;
+ int err;
+
+ TRACE("Entered squashfs_fill_superblock\n");
+
+ sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL);
+ if (sb->s_fs_info == NULL) {
+ ERROR("Failed to allocate squashfs_sb_info\n");
+ return -ENOMEM;
+ }
+ msblk = sb->s_fs_info;
+ msblk->thread_ops = opts->thread_ops;
+
+ msblk->panic_on_errors = (opts->errors == Opt_errors_panic);
+
+ msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);
+ msblk->devblksize_log2 = ffz(~msblk->devblksize);
+
+ mutex_init(&msblk->meta_index_mutex);
+
+ /*
+ * msblk->bytes_used is checked in squashfs_read_table to ensure reads
+ * are not beyond filesystem end. But as we're using
+ * squashfs_read_table here to read the superblock (including the value
+ * of bytes_used) we need to set it to an initial sensible dummy value
+ */
+ msblk->bytes_used = sizeof(*sblk);
+ sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk));
+
+ if (IS_ERR(sblk)) {
+ errorf(fc, "unable to read squashfs_super_block");
+ err = PTR_ERR(sblk);
+ sblk = NULL;
+ goto failed_mount;
+ }
+
+ err = -EINVAL;
+
+ /* Check it is a SQUASHFS superblock */
+ sb->s_magic = le32_to_cpu(sblk->s_magic);
+ if (sb->s_magic != SQUASHFS_MAGIC) {
+ if (!(fc->sb_flags & SB_SILENT))
+ errorf(fc, "Can't find a SQUASHFS superblock on %pg",
+ sb->s_bdev);
+ goto failed_mount;
+ }
+
+ if (opts->thread_num == 0) {
+ msblk->max_thread_num = msblk->thread_ops->max_decompressors();
+ } else {
+ msblk->max_thread_num = opts->thread_num;
+ }
+
+ /* Check the MAJOR & MINOR versions and lookup compression type */
+ msblk->decompressor = supported_squashfs_filesystem(
+ fc,
+ le16_to_cpu(sblk->s_major),
+ le16_to_cpu(sblk->s_minor),
+ le16_to_cpu(sblk->compression));
+ if (msblk->decompressor == NULL)
+ goto failed_mount;
+
+ /* Check the filesystem does not extend beyond the end of the
+ block device */
+ msblk->bytes_used = le64_to_cpu(sblk->bytes_used);
+ if (msblk->bytes_used < 0 ||
+ msblk->bytes_used > bdev_nr_bytes(sb->s_bdev))
+ goto failed_mount;
+
+ /* Check block size for sanity */
+ msblk->block_size = le32_to_cpu(sblk->block_size);
+ if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE)
+ goto insanity;
+
+ /*
+ * Check the system page size is not larger than the filesystem
+ * block size (by default 128K). This is currently not supported.
+ */
+ if (PAGE_SIZE > msblk->block_size) {
+ errorf(fc, "Page size > filesystem block size (%d). This is "
+ "currently not supported!", msblk->block_size);
+ goto failed_mount;
+ }
+
+ /* Check block log for sanity */
+ msblk->block_log = le16_to_cpu(sblk->block_log);
+ if (msblk->block_log > SQUASHFS_FILE_MAX_LOG)
+ goto failed_mount;
+
+ /* Check that block_size and block_log match */
+ if (msblk->block_size != (1 << msblk->block_log))
+ goto insanity;
+
+ /* Check the root inode for sanity */
+ root_inode = le64_to_cpu(sblk->root_inode);
+ if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE)
+ goto insanity;
+
+ msblk->inode_table = le64_to_cpu(sblk->inode_table_start);
+ msblk->directory_table = le64_to_cpu(sblk->directory_table_start);
+ msblk->inodes = le32_to_cpu(sblk->inodes);
+ msblk->fragments = le32_to_cpu(sblk->fragments);
+ msblk->ids = le16_to_cpu(sblk->no_ids);
+ flags = le16_to_cpu(sblk->flags);
+
+ TRACE("Found valid superblock on %pg\n", sb->s_bdev);
+ TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags)
+ ? "un" : "");
+ TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags)
+ ? "un" : "");
+ TRACE("Filesystem size %lld bytes\n", msblk->bytes_used);
+ TRACE("Block size %d\n", msblk->block_size);
+ TRACE("Number of inodes %d\n", msblk->inodes);
+ TRACE("Number of fragments %d\n", msblk->fragments);
+ TRACE("Number of ids %d\n", msblk->ids);
+ TRACE("sblk->inode_table_start %llx\n", msblk->inode_table);
+ TRACE("sblk->directory_table_start %llx\n", msblk->directory_table);
+ TRACE("sblk->fragment_table_start %llx\n",
+ (u64) le64_to_cpu(sblk->fragment_table_start));
+ TRACE("sblk->id_table_start %llx\n",
+ (u64) le64_to_cpu(sblk->id_table_start));
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_time_min = 0;
+ sb->s_time_max = U32_MAX;
+ sb->s_flags |= SB_RDONLY;
+ sb->s_op = &squashfs_super_ops;
+
+ err = -ENOMEM;
+
+ msblk->block_cache = squashfs_cache_init("metadata",
+ SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE);
+ if (msblk->block_cache == NULL)
+ goto failed_mount;
+
+ /* Allocate read_page block */
+ msblk->read_page = squashfs_cache_init("data",
+ msblk->max_thread_num, msblk->block_size);
+ if (msblk->read_page == NULL) {
+ errorf(fc, "Failed to allocate read_page block");
+ goto failed_mount;
+ }
+
+ if (msblk->devblksize == PAGE_SIZE) {
+ struct inode *cache = new_inode(sb);
+
+ if (cache == NULL)
+ goto failed_mount;
+
+ set_nlink(cache, 1);
+ cache->i_size = OFFSET_MAX;
+ mapping_set_gfp_mask(cache->i_mapping, GFP_NOFS);
+
+ msblk->cache_mapping = cache->i_mapping;
+ }
+
+ msblk->stream = squashfs_decompressor_setup(sb, flags);
+ if (IS_ERR(msblk->stream)) {
+ err = PTR_ERR(msblk->stream);
+ msblk->stream = NULL;
+ goto insanity;
+ }
+
+ /* Handle xattrs */
+ sb->s_xattr = squashfs_xattr_handlers;
+ xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start);
+ if (xattr_id_table_start == SQUASHFS_INVALID_BLK) {
+ next_table = msblk->bytes_used;
+ goto allocate_id_index_table;
+ }
+
+ /* Allocate and read xattr id lookup table */
+ msblk->xattr_id_table = squashfs_read_xattr_id_table(sb,
+ xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids);
+ if (IS_ERR(msblk->xattr_id_table)) {
+ errorf(fc, "unable to read xattr id index table");
+ err = PTR_ERR(msblk->xattr_id_table);
+ msblk->xattr_id_table = NULL;
+ if (err != -ENOTSUPP)
+ goto failed_mount;
+ }
+ next_table = msblk->xattr_table;
+
+allocate_id_index_table:
+ /* Allocate and read id index table */
+ msblk->id_table = squashfs_read_id_index_table(sb,
+ le64_to_cpu(sblk->id_table_start), next_table, msblk->ids);
+ if (IS_ERR(msblk->id_table)) {
+ errorf(fc, "unable to read id index table");
+ err = PTR_ERR(msblk->id_table);
+ msblk->id_table = NULL;
+ goto failed_mount;
+ }
+ next_table = le64_to_cpu(msblk->id_table[0]);
+
+ /* Handle inode lookup table */
+ lookup_table_start = le64_to_cpu(sblk->lookup_table_start);
+ if (lookup_table_start == SQUASHFS_INVALID_BLK)
+ goto handle_fragments;
+
+ /* Allocate and read inode lookup table */
+ msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb,
+ lookup_table_start, next_table, msblk->inodes);
+ if (IS_ERR(msblk->inode_lookup_table)) {
+ errorf(fc, "unable to read inode lookup table");
+ err = PTR_ERR(msblk->inode_lookup_table);
+ msblk->inode_lookup_table = NULL;
+ goto failed_mount;
+ }
+ next_table = le64_to_cpu(msblk->inode_lookup_table[0]);
+
+ sb->s_export_op = &squashfs_export_ops;
+
+handle_fragments:
+ fragments = msblk->fragments;
+ if (fragments == 0)
+ goto check_directory_table;
+
+ msblk->fragment_cache = squashfs_cache_init("fragment",
+ SQUASHFS_CACHED_FRAGMENTS, msblk->block_size);
+ if (msblk->fragment_cache == NULL) {
+ err = -ENOMEM;
+ goto failed_mount;
+ }
+
+ /* Allocate and read fragment index table */
+ msblk->fragment_index = squashfs_read_fragment_index_table(sb,
+ le64_to_cpu(sblk->fragment_table_start), next_table, fragments);
+ if (IS_ERR(msblk->fragment_index)) {
+ errorf(fc, "unable to read fragment index table");
+ err = PTR_ERR(msblk->fragment_index);
+ msblk->fragment_index = NULL;
+ goto failed_mount;
+ }
+ next_table = le64_to_cpu(msblk->fragment_index[0]);
+
+check_directory_table:
+ /* Sanity check directory_table */
+ if (msblk->directory_table > next_table) {
+ err = -EINVAL;
+ goto insanity;
+ }
+
+ /* Sanity check inode_table */
+ if (msblk->inode_table >= msblk->directory_table) {
+ err = -EINVAL;
+ goto insanity;
+ }
+
+ /* allocate root */
+ root = new_inode(sb);
+ if (!root) {
+ err = -ENOMEM;
+ goto failed_mount;
+ }
+
+ err = squashfs_read_inode(root, root_inode);
+ if (err) {
+ make_bad_inode(root);
+ iput(root);
+ goto failed_mount;
+ }
+ insert_inode_hash(root);
+
+ sb->s_root = d_make_root(root);
+ if (sb->s_root == NULL) {
+ ERROR("Root inode create failed\n");
+ err = -ENOMEM;
+ goto failed_mount;
+ }
+
+ TRACE("Leaving squashfs_fill_super\n");
+ kfree(sblk);
+ return 0;
+
+insanity:
+ errorf(fc, "squashfs image failed sanity check");
+failed_mount:
+ squashfs_cache_delete(msblk->block_cache);
+ squashfs_cache_delete(msblk->fragment_cache);
+ squashfs_cache_delete(msblk->read_page);
+ if (msblk->cache_mapping)
+ iput(msblk->cache_mapping->host);
+ msblk->thread_ops->destroy(msblk);
+ kfree(msblk->inode_lookup_table);
+ kfree(msblk->fragment_index);
+ kfree(msblk->id_table);
+ kfree(msblk->xattr_id_table);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ kfree(sblk);
+ return err;
+}
+
+static int squashfs_get_tree(struct fs_context *fc)
+{
+ return get_tree_bdev(fc, squashfs_fill_super);
+}
+
+static int squashfs_reconfigure(struct fs_context *fc)
+{
+ struct super_block *sb = fc->root->d_sb;
+ struct squashfs_sb_info *msblk = sb->s_fs_info;
+ struct squashfs_mount_opts *opts = fc->fs_private;
+
+ sync_filesystem(fc->root->d_sb);
+ fc->sb_flags |= SB_RDONLY;
+
+ msblk->panic_on_errors = (opts->errors == Opt_errors_panic);
+
+ return 0;
+}
+
+static void squashfs_free_fs_context(struct fs_context *fc)
+{
+ kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations squashfs_context_ops = {
+ .get_tree = squashfs_get_tree,
+ .free = squashfs_free_fs_context,
+ .parse_param = squashfs_parse_param,
+ .reconfigure = squashfs_reconfigure,
+};
+
+static int squashfs_show_options(struct seq_file *s, struct dentry *root)
+{
+ struct super_block *sb = root->d_sb;
+ struct squashfs_sb_info *msblk = sb->s_fs_info;
+
+ if (msblk->panic_on_errors)
+ seq_puts(s, ",errors=panic");
+ else
+ seq_puts(s, ",errors=continue");
+
+#ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT
+ if (msblk->thread_ops == &squashfs_decompressor_single) {
+ seq_puts(s, ",threads=single");
+ return 0;
+ }
+ if (msblk->thread_ops == &squashfs_decompressor_percpu) {
+ seq_puts(s, ",threads=percpu");
+ return 0;
+ }
+#endif
+#ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS
+ seq_printf(s, ",threads=%d", msblk->max_thread_num);
+#endif
+ return 0;
+}
+
+static int squashfs_init_fs_context(struct fs_context *fc)
+{
+ struct squashfs_mount_opts *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
+
+#ifdef CONFIG_SQUASHFS_DECOMP_SINGLE
+ opts->thread_ops = &squashfs_decompressor_single;
+#elif defined(CONFIG_SQUASHFS_DECOMP_MULTI)
+ opts->thread_ops = &squashfs_decompressor_multi;
+#elif defined(CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU)
+ opts->thread_ops = &squashfs_decompressor_percpu;
+#else
+#error "fail: unknown squashfs decompression thread mode?"
+#endif
+ opts->thread_num = 0;
+ fc->fs_private = opts;
+ fc->ops = &squashfs_context_ops;
+ return 0;
+}
+
+static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info;
+ u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev);
+
+ TRACE("Entered squashfs_statfs\n");
+
+ buf->f_type = SQUASHFS_MAGIC;
+ buf->f_bsize = msblk->block_size;
+ buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1;
+ buf->f_bfree = buf->f_bavail = 0;
+ buf->f_files = msblk->inodes;
+ buf->f_ffree = 0;
+ buf->f_namelen = SQUASHFS_NAME_LEN;
+ buf->f_fsid = u64_to_fsid(id);
+
+ return 0;
+}
+
+
+static void squashfs_put_super(struct super_block *sb)
+{
+ if (sb->s_fs_info) {
+ struct squashfs_sb_info *sbi = sb->s_fs_info;
+ squashfs_cache_delete(sbi->block_cache);
+ squashfs_cache_delete(sbi->fragment_cache);
+ squashfs_cache_delete(sbi->read_page);
+ if (sbi->cache_mapping)
+ iput(sbi->cache_mapping->host);
+ sbi->thread_ops->destroy(sbi);
+ kfree(sbi->id_table);
+ kfree(sbi->fragment_index);
+ kfree(sbi->meta_index);
+ kfree(sbi->inode_lookup_table);
+ kfree(sbi->xattr_id_table);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ }
+}
+
+static struct kmem_cache *squashfs_inode_cachep;
+
+
+static void init_once(void *foo)
+{
+ struct squashfs_inode_info *ei = foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+
+static int __init init_inodecache(void)
+{
+ squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache",
+ sizeof(struct squashfs_inode_info), 0,
+ SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
+ init_once);
+
+ return squashfs_inode_cachep ? 0 : -ENOMEM;
+}
+
+
+static void destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(squashfs_inode_cachep);
+}
+
+
+static int __init init_squashfs_fs(void)
+{
+ int err = init_inodecache();
+
+ if (err)
+ return err;
+
+ err = register_filesystem(&squashfs_fs_type);
+ if (err) {
+ destroy_inodecache();
+ return err;
+ }
+
+ pr_info("version 4.0 (2009/01/31) Phillip Lougher\n");
+
+ return 0;
+}
+
+
+static void __exit exit_squashfs_fs(void)
+{
+ unregister_filesystem(&squashfs_fs_type);
+ destroy_inodecache();
+}
+
+
+static struct inode *squashfs_alloc_inode(struct super_block *sb)
+{
+ struct squashfs_inode_info *ei =
+ alloc_inode_sb(sb, squashfs_inode_cachep, GFP_KERNEL);
+
+ return ei ? &ei->vfs_inode : NULL;
+}
+
+
+static void squashfs_free_inode(struct inode *inode)
+{
+ kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode));
+}
+
+static struct file_system_type squashfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "squashfs",
+ .init_fs_context = squashfs_init_fs_context,
+ .parameters = squashfs_fs_parameters,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+};
+MODULE_ALIAS_FS("squashfs");
+
+static const struct super_operations squashfs_super_ops = {
+ .alloc_inode = squashfs_alloc_inode,
+ .free_inode = squashfs_free_inode,
+ .statfs = squashfs_statfs,
+ .put_super = squashfs_put_super,
+ .show_options = squashfs_show_options,
+};
+
+module_init(init_squashfs_fs);
+module_exit(exit_squashfs_fs);
+MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem");
+MODULE_AUTHOR("Phillip Lougher <phillip@squashfs.org.uk>");
+MODULE_LICENSE("GPL");