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ANDROID: sdcardfs: Add option to not link obb

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Add mount option unshared_obb to not link the obb
folders of multiple users together.

Bug: 27915347
Test: mount with option. Check if altering one obb
      alters the other
Signed-off-by: Daniel Rosenberg <drosen@google.com>

Change-Id: I3956e06bd0a222b0bbb2768c9a8a8372ada85e1e
This commit is contained in:
Daniel Rosenberg 2018-10-25 16:25:15 -07:00 committed by Nolen Johnson
parent 5e5a0b5125
commit 5c4b88269c
3 changed files with 12 additions and 2 deletions
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3
fs/sdcardfs/derived_perm.c
View file

@ -351,7 +351,8 @@ int need_graft_path(struct dentry *dentry)
struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb);
struct qstr obb = QSTR_LITERAL("obb");
if (parent_info->data->perm == PERM_ANDROID &&
if (!sbi->options.unshared_obb &&
parent_info->data->perm == PERM_ANDROID &&
qstr_case_eq(&dentry->d_name, &obb)) {
/* /Android/obb is the base obbpath of DERIVED_UNIFIED */

8
fs/sdcardfs/main.c
View file

@ -34,6 +34,7 @@ enum {
Opt_reserved_mb,
Opt_gid_derivation,
Opt_default_normal,
Opt_unshared_obb,
Opt_err,
};
@ -47,6 +48,7 @@ static const match_table_t sdcardfs_tokens = {
{Opt_multiuser, "multiuser"},
{Opt_gid_derivation, "derive_gid"},
{Opt_default_normal, "default_normal"},
{Opt_unshared_obb, "unshared_obb"},
{Opt_reserved_mb, "reserved_mb=%u"},
{Opt_err, NULL}
};
@ -128,6 +130,9 @@ static int parse_options(struct super_block *sb, char *options, int silent,
case Opt_default_normal:
vfsopts->default_normal = true;
break;
case Opt_unshared_obb:
opts->unshared_obb = true;
break;
/* unknown option */
default:
if (!silent)
@ -181,12 +186,15 @@ int parse_options_remount(struct super_block *sb, char *options, int silent,
return 0;
vfsopts->mask = option;
break;
case Opt_unshared_obb:
case Opt_default_normal:
case Opt_multiuser:
case Opt_userid:
case Opt_fsuid:
case Opt_fsgid:
case Opt_reserved_mb:
case Opt_gid_derivation:
if (!silent)
pr_warn("Option \"%s\" can't be changed during remount\n", p);
break;
/* unknown option */

1
fs/sdcardfs/sdcardfs.h
View file

@ -219,6 +219,7 @@ struct sdcardfs_mount_options {
userid_t fs_user_id;
bool multiuser;
bool gid_derivation;
bool unshared_obb;
unsigned int reserved_mb;
};