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* [PATCH v3 1/2] staging: erofs: use xattr_prefix to wrap up
@ 2019-01-26  3:48 Gao Xiang
  2019-01-26  3:48 ` [PATCH v3 2/2] staging: erofs: complete POSIX ACL support Gao Xiang
  0 siblings, 1 reply; 3+ messages in thread
From: Gao Xiang @ 2019-01-26  3:48 UTC (permalink / raw)
  To: Chao Yu, Greg Kroah-Hartman
  Cc: devel, linux-erofs, LKML, chao, weidu.du, Miao Xie, Gao Xiang

From: Gao Xiang <gaoxiang25@huawei.com>

Let's use xattr_prefix instead of open code.
No logic changes.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
 drivers/staging/erofs/xattr.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/erofs/xattr.c b/drivers/staging/erofs/xattr.c
index 1c9498e38f0e..7de46690d972 100644
--- a/drivers/staging/erofs/xattr.c
+++ b/drivers/staging/erofs/xattr.c
@@ -520,8 +520,7 @@ static int xattr_entrylist(struct xattr_iter *_it,
 	if (h == NULL || (h->list != NULL && !h->list(it->dentry)))
 		return 1;
 
-	/* Note that at least one of 'prefix' and 'name' should be non-NULL */
-	prefix = h->prefix != NULL ? h->prefix : h->name;
+	prefix = xattr_prefix(h);
 	prefix_len = strlen(prefix);
 
 	if (it->buffer == NULL) {
-- 
2.11.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH v3 2/2] staging: erofs: complete POSIX ACL support
  2019-01-26  3:48 [PATCH v3 1/2] staging: erofs: use xattr_prefix to wrap up Gao Xiang
@ 2019-01-26  3:48 ` Gao Xiang
  2019-01-26  6:43   ` Chao Yu
  0 siblings, 1 reply; 3+ messages in thread
From: Gao Xiang @ 2019-01-26  3:48 UTC (permalink / raw)
  To: Chao Yu, Greg Kroah-Hartman
  Cc: devel, linux-erofs, LKML, chao, weidu.du, Miao Xie, Gao Xiang

From: Gao Xiang <gaoxiang25@huawei.com>

Let's add .get_acl() to read the file's acl from its xattrs
to make POSIX ACL usable.

Here is the on-disk detail,
fullname: system.posix_acl_access
struct erofs_xattr_entry:
        .e_name_len = 0
        .e_name_index = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS (2)

fullname: system.posix_acl_default
struct erofs_xattr_entry:
	.e_name_len = 0
	.e_name_index = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT (3)

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
change log v3:
 - kvmalloc -> erofs_kmalloc suggested by Chao;
 - update SB_POSIXACL for the remount case as well;

 .../erofs/Documentation/filesystems/erofs.txt      |  2 ++
 drivers/staging/erofs/inode.c                      |  3 ++
 drivers/staging/erofs/namei.c                      |  1 +
 drivers/staging/erofs/super.c                      | 10 ++++++
 drivers/staging/erofs/xattr.c                      | 37 ++++++++++++++++++++++
 drivers/staging/erofs/xattr.h                      |  6 ++++
 6 files changed, 59 insertions(+)

diff --git a/drivers/staging/erofs/Documentation/filesystems/erofs.txt b/drivers/staging/erofs/Documentation/filesystems/erofs.txt
index 803988d74c21..961ec4da7705 100644
--- a/drivers/staging/erofs/Documentation/filesystems/erofs.txt
+++ b/drivers/staging/erofs/Documentation/filesystems/erofs.txt
@@ -36,6 +36,8 @@ Here is the main features of EROFS:
 
  - Support xattr inline and tail-end data inline for all files;
 
+ - Support POSIX.1e ACLs by using xattrs;
+
  - Support transparent file compression as an option:
    LZ4 algorithm with 4 KB fixed-output compression for high performance;
 
diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 4f04f7c38cf2..924b8dfc7a8f 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -287,6 +287,7 @@ const struct inode_operations erofs_generic_iops = {
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
+	.get_acl = erofs_get_acl,
 };
 
 const struct inode_operations erofs_symlink_iops = {
@@ -294,6 +295,7 @@ const struct inode_operations erofs_symlink_iops = {
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
+	.get_acl = erofs_get_acl,
 };
 
 const struct inode_operations erofs_fast_symlink_iops = {
@@ -301,5 +303,6 @@ const struct inode_operations erofs_fast_symlink_iops = {
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
+	.get_acl = erofs_get_acl,
 };
 
diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
index 7fed1f996ab0..b1752adc5934 100644
--- a/drivers/staging/erofs/namei.c
+++ b/drivers/staging/erofs/namei.c
@@ -238,5 +238,6 @@ const struct inode_operations erofs_dir_iops = {
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
+	.get_acl = erofs_get_acl,
 };
 
diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
index 176fca2af379..15c784fba879 100644
--- a/drivers/staging/erofs/super.c
+++ b/drivers/staging/erofs/super.c
@@ -398,6 +398,11 @@ static int erofs_read_super(struct super_block *sb,
 	if (!silent)
 		infoln("root inode @ nid %llu", ROOT_NID(sbi));
 
+	if (test_opt(sbi, POSIX_ACL))
+		sb->s_flags |= SB_POSIXACL;
+	else
+		sb->s_flags &= ~SB_POSIXACL;
+
 #ifdef CONFIG_EROFS_FS_ZIP
 	INIT_RADIX_TREE(&sbi->workstn_tree, GFP_ATOMIC);
 #endif
@@ -646,6 +651,11 @@ static int erofs_remount(struct super_block *sb, int *flags, char *data)
 	if (err)
 		goto out;
 
+	if (test_opt(sbi, POSIX_ACL))
+		sb->s_flags |= SB_POSIXACL;
+	else
+		sb->s_flags &= ~SB_POSIXACL;
+
 	*flags |= SB_RDONLY;
 	return 0;
 out:
diff --git a/drivers/staging/erofs/xattr.c b/drivers/staging/erofs/xattr.c
index 7de46690d972..d2241f73a7b9 100644
--- a/drivers/staging/erofs/xattr.c
+++ b/drivers/staging/erofs/xattr.c
@@ -643,3 +643,40 @@ ssize_t erofs_listxattr(struct dentry *dentry,
 	return shared_listxattr(&it);
 }
 
+#ifdef CONFIG_EROFS_FS_POSIX_ACL
+struct posix_acl *erofs_get_acl(struct inode *inode, int type)
+{
+	struct posix_acl *acl;
+	int prefix, rc;
+	char *value = NULL;
+
+	switch (type) {
+	case ACL_TYPE_ACCESS:
+		prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS;
+		break;
+	case ACL_TYPE_DEFAULT:
+		prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
+		break;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
+
+	rc = erofs_getxattr(inode, prefix, "", NULL, 0);
+	if (rc > 0) {
+		value = erofs_kmalloc(EROFS_I_SB(inode), rc, GFP_KERNEL);
+		if (!value)
+			return ERR_PTR(-ENOMEM);
+		rc = erofs_getxattr(inode, prefix, "", value, rc);
+	}
+
+	if (rc == -ENOATTR)
+		acl = NULL;
+	else if (rc < 0)
+		acl = ERR_PTR(rc);
+	else
+		acl = posix_acl_from_xattr(&init_user_ns, value, rc);
+	kfree(value);
+	return acl;
+}
+#endif
+
diff --git a/drivers/staging/erofs/xattr.h b/drivers/staging/erofs/xattr.h
index 634dae9aaa0b..35ba5ac2139a 100644
--- a/drivers/staging/erofs/xattr.h
+++ b/drivers/staging/erofs/xattr.h
@@ -87,5 +87,11 @@ static ssize_t __maybe_unused erofs_listxattr(struct dentry *dentry,
 }
 #endif
 
+#ifdef CONFIG_EROFS_FS_POSIX_ACL
+struct posix_acl *erofs_get_acl(struct inode *inode, int type);
+#else
+#define erofs_get_acl	(NULL)
+#endif
+
 #endif
 
-- 
2.11.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [PATCH v3 2/2] staging: erofs: complete POSIX ACL support
  2019-01-26  3:48 ` [PATCH v3 2/2] staging: erofs: complete POSIX ACL support Gao Xiang
@ 2019-01-26  6:43   ` Chao Yu
  0 siblings, 0 replies; 3+ messages in thread
From: Chao Yu @ 2019-01-26  6:43 UTC (permalink / raw)
  To: Gao Xiang, Greg Kroah-Hartman
  Cc: devel, linux-erofs, LKML, chao, weidu.du, Miao Xie, Gao Xiang

On 2019/1/26 11:48, Gao Xiang wrote:
> From: Gao Xiang <gaoxiang25@huawei.com>
> 
> Let's add .get_acl() to read the file's acl from its xattrs
> to make POSIX ACL usable.
> 
> Here is the on-disk detail,
> fullname: system.posix_acl_access
> struct erofs_xattr_entry:
>         .e_name_len = 0
>         .e_name_index = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS (2)
> 
> fullname: system.posix_acl_default
> struct erofs_xattr_entry:
> 	.e_name_len = 0
> 	.e_name_index = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT (3)
> 
> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
> ---
> change log v3:
>  - kvmalloc -> erofs_kmalloc suggested by Chao;
>  - update SB_POSIXACL for the remount case as well;

Oh, correct, remount case, I missed that one.

It looks good to me now. :)

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,


^ permalink raw reply	[flat|nested] 3+ messages in thread
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