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Commit 258a5aa8 authored by Nick Piggin's avatar Nick Piggin
Browse files

btrfs: provide simple rcu-walk ACL implementation 



This simple implementation just checks for no ACLs on the inode, and
if so, then the rcu-walk may proceed, otherwise fail it.

Signed-off-by: default avatarNick Piggin <npiggin@kernel.dk>
parent 73598611

fs/btrfs/acl.c

+12 −9
Original line number Diff line number Diff line
@@ -187,12 +187,14 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name, 


int btrfs_check_acl(struct inode *inode, int mask, unsigned int flags)

{

	struct posix_acl *acl;

	int error = -EAGAIN;



	if (flags & IPERM_FLAG_RCU)

		return -ECHILD;

	if (flags & IPERM_FLAG_RCU) {

		if (!negative_cached_acl(inode, ACL_TYPE_ACCESS))

			error = -ECHILD;



	} else {

		struct posix_acl *acl;

		acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS);

		if (IS_ERR(acl))

			return PTR_ERR(acl);
@@ -200,6 +202,7 @@ int btrfs_check_acl(struct inode *inode, int mask, unsigned int flags) 
			error = posix_acl_permission(inode, acl, mask);

			posix_acl_release(acl);

		}

	}



	return error;

}

fs/btrfs/inode.c

+0 −3
Original line number Diff line number Diff line
@@ -7213,9 +7213,6 @@ static int btrfs_set_page_dirty(struct page *page) 


static int btrfs_permission(struct inode *inode, int mask, unsigned int flags)

{

	if (flags & IPERM_FLAG_RCU)

		return -ECHILD;



	if ((BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) && (mask & MAY_WRITE))

		return -EACCES;

	return generic_permission(inode, mask, flags, btrfs_check_acl);