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firmware/br-ext-chip-allwinner/board/v83x/kernel/patches/00000-fs_sdcardfs_main.c.patch

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diff -drupN a/fs/sdcardfs/main.c b/fs/sdcardfs/main.c
--- a/fs/sdcardfs/main.c 1970-01-01 03:00:00.000000000 +0300
+++ b/fs/sdcardfs/main.c 2022-06-12 05:28:14.000000000 +0300
@@ -0,0 +1,490 @@
+/*
+ * fs/sdcardfs/main.c
+ *
+ * Copyright (c) 2013 Samsung Electronics Co. Ltd
+ * Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
+ * Sunghwan Yun, Sungjong Seo
+ *
+ * This program has been developed as a stackable file system based on
+ * the WrapFS which written by
+ *
+ * Copyright (c) 1998-2011 Erez Zadok
+ * Copyright (c) 2009 Shrikar Archak
+ * Copyright (c) 2003-2011 Stony Brook University
+ * Copyright (c) 2003-2011 The Research Foundation of SUNY
+ *
+ * This file is dual licensed. It may be redistributed and/or modified
+ * under the terms of the Apache 2.0 License OR version 2 of the GNU
+ * General Public License.
+ */
+
+#include "sdcardfs.h"
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/parser.h>
+
+enum {
+ Opt_fsuid,
+ Opt_fsgid,
+ Opt_gid,
+ Opt_debug,
+ Opt_mask,
+ Opt_multiuser,
+ Opt_userid,
+ Opt_reserved_mb,
+ Opt_gid_derivation,
+ Opt_default_normal,
+ Opt_err,
+};
+
+static const match_table_t sdcardfs_tokens = {
+ {Opt_fsuid, "fsuid=%u"},
+ {Opt_fsgid, "fsgid=%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_debug, "debug"},
+ {Opt_mask, "mask=%u"},
+ {Opt_userid, "userid=%d"},
+ {Opt_multiuser, "multiuser"},
+ {Opt_gid_derivation, "derive_gid"},
+ {Opt_default_normal, "default_normal"},
+ {Opt_reserved_mb, "reserved_mb=%u"},
+ {Opt_err, NULL}
+};
+
+static int parse_options(struct super_block *sb, char *options, int silent,
+ int *debug, struct sdcardfs_vfsmount_options *vfsopts,
+ struct sdcardfs_mount_options *opts)
+{
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int option;
+
+ /* by default, we use AID_MEDIA_RW as uid, gid */
+ opts->fs_low_uid = AID_MEDIA_RW;
+ opts->fs_low_gid = AID_MEDIA_RW;
+ vfsopts->mask = 0;
+ opts->multiuser = false;
+ opts->fs_user_id = 0;
+ vfsopts->gid = 0;
+ /* by default, 0MB is reserved */
+ opts->reserved_mb = 0;
+ /* by default, gid derivation is off */
+ opts->gid_derivation = false;
+ opts->default_normal = false;
+
+ *debug = 0;
+
+ if (!options)
+ return 0;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, sdcardfs_tokens, args);
+
+ switch (token) {
+ case Opt_debug:
+ *debug = 1;
+ break;
+ case Opt_fsuid:
+ if (match_int(&args[0], &option))
+ return 0;
+ opts->fs_low_uid = option;
+ break;
+ case Opt_fsgid:
+ if (match_int(&args[0], &option))
+ return 0;
+ opts->fs_low_gid = option;
+ break;
+ case Opt_gid:
+ if (match_int(&args[0], &option))
+ return 0;
+ vfsopts->gid = option;
+ break;
+ case Opt_userid:
+ if (match_int(&args[0], &option))
+ return 0;
+ opts->fs_user_id = option;
+ break;
+ case Opt_mask:
+ if (match_int(&args[0], &option))
+ return 0;
+ vfsopts->mask = option;
+ break;
+ case Opt_multiuser:
+ opts->multiuser = true;
+ break;
+ case Opt_reserved_mb:
+ if (match_int(&args[0], &option))
+ return 0;
+ opts->reserved_mb = option;
+ break;
+ case Opt_gid_derivation:
+ opts->gid_derivation = true;
+ break;
+ case Opt_default_normal:
+ opts->default_normal = true;
+ break;
+ /* unknown option */
+ default:
+ if (!silent)
+ pr_err("Unrecognized mount option \"%s\" or missing value", p);
+ return -EINVAL;
+ }
+ }
+
+ if (*debug) {
+ pr_info("sdcardfs : options - debug:%d\n", *debug);
+ pr_info("sdcardfs : options - uid:%d\n",
+ opts->fs_low_uid);
+ pr_info("sdcardfs : options - gid:%d\n",
+ opts->fs_low_gid);
+ }
+
+ return 0;
+}
+
+int parse_options_remount(struct super_block *sb, char *options, int silent,
+ struct sdcardfs_vfsmount_options *vfsopts)
+{
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int option;
+ int debug;
+
+ if (!options)
+ return 0;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, sdcardfs_tokens, args);
+
+ switch (token) {
+ case Opt_debug:
+ debug = 1;
+ break;
+ case Opt_gid:
+ if (match_int(&args[0], &option))
+ return 0;
+ vfsopts->gid = option;
+
+ break;
+ case Opt_mask:
+ if (match_int(&args[0], &option))
+ return 0;
+ vfsopts->mask = option;
+ break;
+ case Opt_default_normal:
+ case Opt_multiuser:
+ case Opt_userid:
+ case Opt_fsuid:
+ case Opt_fsgid:
+ case Opt_reserved_mb:
+ pr_warn("Option \"%s\" can't be changed during remount\n", p);
+ break;
+ /* unknown option */
+ default:
+ if (!silent)
+ pr_err("Unrecognized mount option \"%s\" or missing value", p);
+ return -EINVAL;
+ }
+ }
+
+ if (debug) {
+ pr_info("sdcardfs : options - debug:%d\n", debug);
+ pr_info("sdcardfs : options - gid:%d\n", vfsopts->gid);
+ pr_info("sdcardfs : options - mask:%d\n", vfsopts->mask);
+ }
+
+ return 0;
+}
+
+#if 0
+/*
+ * our custom d_alloc_root work-alike
+ *
+ * we can't use d_alloc_root if we want to use our own interpose function
+ * unchanged, so we simply call our own "fake" d_alloc_root
+ */
+static struct dentry *sdcardfs_d_alloc_root(struct super_block *sb)
+{
+ struct dentry *ret = NULL;
+
+ if (sb) {
+ static const struct qstr name = {
+ .name = "/",
+ .len = 1
+ };
+
+ ret = d_alloc(NULL, &name);
+ if (ret) {
+ d_set_d_op(ret, &sdcardfs_ci_dops);
+ ret->d_sb = sb;
+ ret->d_parent = ret;
+ }
+ }
+ return ret;
+}
+#endif
+
+DEFINE_MUTEX(sdcardfs_super_list_lock);
+EXPORT_SYMBOL_GPL(sdcardfs_super_list_lock);
+LIST_HEAD(sdcardfs_super_list);
+EXPORT_SYMBOL_GPL(sdcardfs_super_list);
+
+/*
+ * There is no need to lock the sdcardfs_super_info's rwsem as there is no
+ * way anyone can have a reference to the superblock at this point in time.
+ */
+static int sdcardfs_read_super(struct vfsmount *mnt, struct super_block *sb,
+ const char *dev_name, void *raw_data, int silent)
+{
+ int err = 0;
+ int debug;
+ struct super_block *lower_sb;
+ struct path lower_path;
+ struct sdcardfs_sb_info *sb_info;
+ struct sdcardfs_vfsmount_options *mnt_opt = mnt->data;
+ struct inode *inode;
+
+ pr_info("sdcardfs version 2.0\n");
+
+ if (!dev_name) {
+ pr_err("sdcardfs: read_super: missing dev_name argument\n");
+ err = -EINVAL;
+ goto out;
+ }
+
+ pr_info("sdcardfs: dev_name -> %s\n", dev_name);
+ pr_info("sdcardfs: options -> %s\n", (char *)raw_data);
+ pr_info("sdcardfs: mnt -> %p\n", mnt);
+
+ /* parse lower path */
+ err = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
+ &lower_path);
+ if (err) {
+ pr_err("sdcardfs: error accessing lower directory '%s'\n", dev_name);
+ goto out;
+ }
+
+ /* allocate superblock private data */
+ sb->s_fs_info = kzalloc(sizeof(struct sdcardfs_sb_info), GFP_KERNEL);
+ if (!SDCARDFS_SB(sb)) {
+ pr_crit("sdcardfs: read_super: out of memory\n");
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ sb_info = sb->s_fs_info;
+ /* parse options */
+ err = parse_options(sb, raw_data, silent, &debug, mnt_opt, &sb_info->options);
+ if (err) {
+ pr_err("sdcardfs: invalid options\n");
+ goto out_freesbi;
+ }
+
+ /* set the lower superblock field of upper superblock */
+ lower_sb = lower_path.dentry->d_sb;
+ atomic_inc(&lower_sb->s_active);
+ sdcardfs_set_lower_super(sb, lower_sb);
+
+ /* inherit maxbytes from lower file system */
+ sb->s_maxbytes = lower_sb->s_maxbytes;
+
+ /*
+ * Our c/m/atime granularity is 1 ns because we may stack on file
+ * systems whose granularity is as good.
+ */
+ sb->s_time_gran = 1;
+
+ sb->s_magic = SDCARDFS_SUPER_MAGIC;
+ sb->s_op = &sdcardfs_sops;
+
+ /* get a new inode and allocate our root dentry */
+ inode = sdcardfs_iget(sb, d_inode(lower_path.dentry), 0);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto out_sput;
+ }
+ sb->s_root = d_make_root(inode);
+ if (!sb->s_root) {
+ err = -ENOMEM;
+ goto out_sput;
+ }
+ d_set_d_op(sb->s_root, &sdcardfs_ci_dops);
+
+ /* link the upper and lower dentries */
+ sb->s_root->d_fsdata = NULL;
+ err = new_dentry_private_data(sb->s_root);
+ if (err)
+ goto out_freeroot;
+
+ /* set the lower dentries for s_root */
+ sdcardfs_set_lower_path(sb->s_root, &lower_path);
+
+ /*
+ * No need to call interpose because we already have a positive
+ * dentry, which was instantiated by d_make_root. Just need to
+ * d_rehash it.
+ */
+ d_rehash(sb->s_root);
+
+ /* setup permission policy */
+ sb_info->obbpath_s = kzalloc(PATH_MAX, GFP_KERNEL);
+ mutex_lock(&sdcardfs_super_list_lock);
+ if (sb_info->options.multiuser) {
+ setup_derived_state(d_inode(sb->s_root), PERM_PRE_ROOT,
+ sb_info->options.fs_user_id, AID_ROOT);
+ snprintf(sb_info->obbpath_s, PATH_MAX, "%s/obb", dev_name);
+ } else {
+ setup_derived_state(d_inode(sb->s_root), PERM_ROOT,
+ sb_info->options.fs_user_id, AID_ROOT);
+ snprintf(sb_info->obbpath_s, PATH_MAX, "%s/Android/obb", dev_name);
+ }
+ fixup_tmp_permissions(d_inode(sb->s_root));
+ sb_info->sb = sb;
+ list_add(&sb_info->list, &sdcardfs_super_list);
+ mutex_unlock(&sdcardfs_super_list_lock);
+
+ if (!silent)
+ pr_info("sdcardfs: mounted on top of %s type %s\n",
+ dev_name, lower_sb->s_type->name);
+ goto out; /* all is well */
+
+ /* no longer needed: free_dentry_private_data(sb->s_root); */
+out_freeroot:
+ dput(sb->s_root);
+ sb->s_root = NULL;
+out_sput:
+ /* drop refs we took earlier */
+ atomic_dec(&lower_sb->s_active);
+out_freesbi:
+ kfree(SDCARDFS_SB(sb));
+ sb->s_fs_info = NULL;
+out_free:
+ path_put(&lower_path);
+
+out:
+ return err;
+}
+
+struct sdcardfs_mount_private {
+ struct vfsmount *mnt;
+ const char *dev_name;
+ void *raw_data;
+};
+
+static int __sdcardfs_fill_super(
+ struct super_block *sb,
+ void *_priv, int silent)
+{
+ struct sdcardfs_mount_private *priv = _priv;
+
+ return sdcardfs_read_super(priv->mnt,
+ sb, priv->dev_name, priv->raw_data, silent);
+}
+
+static struct dentry *sdcardfs_mount(struct vfsmount *mnt,
+ struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *raw_data)
+{
+ struct sdcardfs_mount_private priv = {
+ .mnt = mnt,
+ .dev_name = dev_name,
+ .raw_data = raw_data
+ };
+
+ return mount_nodev(fs_type, flags,
+ &priv, __sdcardfs_fill_super);
+}
+
+static struct dentry *sdcardfs_mount_wrn(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *raw_data)
+{
+ WARN(1, "sdcardfs does not support mount. Use mount2.\n");
+ return ERR_PTR(-EINVAL);
+}
+
+void *sdcardfs_alloc_mnt_data(void)
+{
+ return kmalloc(sizeof(struct sdcardfs_vfsmount_options), GFP_KERNEL);
+}
+
+void sdcardfs_kill_sb(struct super_block *sb)
+{
+ struct sdcardfs_sb_info *sbi;
+
+ if (sb->s_magic == SDCARDFS_SUPER_MAGIC && sb->s_fs_info) {
+ sbi = SDCARDFS_SB(sb);
+ mutex_lock(&sdcardfs_super_list_lock);
+ list_del(&sbi->list);
+ mutex_unlock(&sdcardfs_super_list_lock);
+ }
+ kill_anon_super(sb);
+}
+
+static struct file_system_type sdcardfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = SDCARDFS_NAME,
+ .mount = sdcardfs_mount_wrn,
+ .mount2 = sdcardfs_mount,
+ .alloc_mnt_data = sdcardfs_alloc_mnt_data,
+ .kill_sb = sdcardfs_kill_sb,
+ .fs_flags = 0,
+};
+MODULE_ALIAS_FS(SDCARDFS_NAME);
+
+static int __init init_sdcardfs_fs(void)
+{
+ int err;
+
+ pr_info("Registering sdcardfs " SDCARDFS_VERSION "\n");
+
+ err = sdcardfs_init_inode_cache();
+ if (err)
+ goto out;
+ err = sdcardfs_init_dentry_cache();
+ if (err)
+ goto out;
+ err = packagelist_init();
+ if (err)
+ goto out;
+ err = register_filesystem(&sdcardfs_fs_type);
+out:
+ if (err) {
+ sdcardfs_destroy_inode_cache();
+ sdcardfs_destroy_dentry_cache();
+ packagelist_exit();
+ }
+ return err;
+}
+
+static void __exit exit_sdcardfs_fs(void)
+{
+ sdcardfs_destroy_inode_cache();
+ sdcardfs_destroy_dentry_cache();
+ packagelist_exit();
+ unregister_filesystem(&sdcardfs_fs_type);
+ pr_info("Completed sdcardfs module unload\n");
+}
+
+/* Original wrapfs authors */
+MODULE_AUTHOR("Erez Zadok, Filesystems and Storage Lab, Stony Brook University (http://www.fsl.cs.sunysb.edu/)");
+
+/* Original sdcardfs authors */
+MODULE_AUTHOR("Woojoong Lee, Daeho Jeong, Kitae Lee, Yeongjin Gil System Memory Lab., Samsung Electronics");
+
+/* Current maintainer */
+MODULE_AUTHOR("Daniel Rosenberg, Google");
+MODULE_DESCRIPTION("Sdcardfs " SDCARDFS_VERSION);
+MODULE_LICENSE("GPL");
+
+module_init(init_sdcardfs_fs);
+module_exit(exit_sdcardfs_fs);
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