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sdcardfs: set lower fs xattr at mounting

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Maya need to set lower fs xattr to query directory writers and relative
access time. Configuring xattr setting by kernel defconfig is supported.

Change-Id: Ib2760eef11156ced25cc05f70936eb9693c5cb35
Signed-off-by: Shiyong Li <a22381@motorola.com>
Reviewed-on: https://gerrit.mot.com/1249380
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Hujun Liao <liaohj@motorola.com>
Submit-Approved: Jira Key
Signed-off-by: Forenche <prahul2003@gmail.com>
This commit is contained in:
Shiyong Li 2018-08-30 09:48:09 -07:00 committed by Forenche
parent 01757ca946
commit 83ca69d788
No known key found for this signature in database
GPG Key ID: 1337D655BAFE85E2
5 changed files with 27 additions and 4 deletions
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4
fs/sdcardfs/Kconfig
View File

@ -13,7 +13,7 @@ config SDCARD_FS_FADV_NOACTIVE
Sdcardfs supports fadvise noactive mode.
config SDCARD_FS_PARTIAL_RELATIME
bool "sdcardfs partial relatime update support"
string "sdcardfs partial relatime update support"
depends on SDCARD_FS
default n
help
@ -24,7 +24,7 @@ config SDCARD_FS_PARTIAL_RELATIME
would be updated whatever their xattr is set.
config SDCARD_FS_DIR_WRITER
bool "sdcardfs directory writer extended attribute support"
string "sdcardfs directory writer extended attribute support"
depends on SDCARD_FS
default n
help

2
fs/sdcardfs/dentry.c
View File

@ -194,7 +194,7 @@ void sdcardfs_update_xattr_dirwriter(struct dentry *lower_dentry,
struct dentry *dentry, *parent;
const char *dir_name[2];
int xlen, depth;
const char *xattr_feat_name = "user.dwriter";
const char *xattr_feat_name = SDCARDFS_XATTR_DWRITER_NAME;
const char *xattr_name = "user.dwriter.name";
struct dentry *xdentry = NULL, *child = NULL;
appid_t app_id = uid_is_app(writer_uid) ?

2
fs/sdcardfs/inode.c
View File

@ -816,7 +816,7 @@ void sdcardfs_update_relatime_flag(struct file *lower_file,
char *xexcept = NULL, *xpath;
int xlen, i, depth = 0;
struct dentry *dentry, *parent, *child = NULL;
const char *xattr_name = "user.relatime";
const char *xattr_name = SDCARDFS_XATTR_PARTIAL_RELATIME_NAME;
__u32 flags = 0;
appid_t app_id = uid_is_app(writer_uid) ?
writer_uid % AID_USER_OFFSET : 0;

21
fs/sdcardfs/main.c
View File

@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/types.h>
#include <linux/parser.h>
#include <linux/xattr.h>
enum {
Opt_fsuid,
@ -381,6 +382,26 @@ static int sdcardfs_read_super(struct vfsmount *mnt, struct super_block *sb,
if (!silent)
pr_info("sdcardfs: mounted on top of %s type %s\n",
dev_name, lower_sb->s_type->name);
#ifdef CONFIG_SDCARD_FS_DIR_WRITER
if (vfs_setxattr(lower_path.dentry,
SDCARDFS_XATTR_DWRITER_NAME,
CONFIG_SDCARD_FS_DIR_WRITER,
strlen(CONFIG_SDCARD_FS_DIR_WRITER), 0)) {
pr_warn("sdcardfs: failed to set %s\n",
SDCARDFS_XATTR_DWRITER_NAME);
}
#endif
#ifdef CONFIG_SDCARD_FS_PARTIAL_RELATIME
if (vfs_setxattr(lower_path.dentry,
SDCARDFS_XATTR_PARTIAL_RELATIME_NAME,
CONFIG_SDCARD_FS_PARTIAL_RELATIME,
strlen(CONFIG_SDCARD_FS_PARTIAL_RELATIME), 0)) {
pr_warn("sdcardfs: failed to set xattr %s\n",
SDCARDFS_XATTR_PARTIAL_RELATIME_NAME);
}
#endif
goto out; /* all is well */
/* no longer needed: free_dentry_private_data(sb->s_root); */

2
fs/sdcardfs/sdcardfs.h
View File

@ -73,6 +73,8 @@
#define AID_PACKAGE_INFO 1027
#define SDCARDFS_XATTR_DWRITER_NAME "user.dwriter"
#define SDCARDFS_XATTR_PARTIAL_RELATIME_NAME "user.relatime"
/*
* Permissions are handled by our permission function.