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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: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin 2011-01-07 17:50:01 +11:00
parent 73598611ad
commit 258a5aa8df
2 changed files with 12 additions and 12 deletions
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21
fs/btrfs/acl.c
View File

@ -187,18 +187,21 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name,
int btrfs_check_acl(struct inode *inode, int mask, unsigned int flags) int btrfs_check_acl(struct inode *inode, int mask, unsigned int flags)
{ {
struct posix_acl *acl;
int error = -EAGAIN; int error = -EAGAIN;
if (flags & IPERM_FLAG_RCU) if (flags & IPERM_FLAG_RCU) {
return -ECHILD; if (!negative_cached_acl(inode, ACL_TYPE_ACCESS))
error = -ECHILD;
acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS); } else {
if (IS_ERR(acl)) struct posix_acl *acl;
return PTR_ERR(acl); acl = btrfs_get_acl(inode, ACL_TYPE_ACCESS);
if (acl) { if (IS_ERR(acl))
error = posix_acl_permission(inode, acl, mask); return PTR_ERR(acl);
posix_acl_release(acl); if (acl) {
error = posix_acl_permission(inode, acl, mask);
posix_acl_release(acl);
}
} }
return error; return error;

3
fs/btrfs/inode.c
View File

@ -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) 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)) if ((BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) && (mask & MAY_WRITE))
return -EACCES; return -EACCES;
return generic_permission(inode, mask, flags, btrfs_check_acl); return generic_permission(inode, mask, flags, btrfs_check_acl);