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helpers for acl caching + switch to those

Browse source 
helpers: get_cached_acl(inode, type), set_cached_acl(inode, type, acl),
forget_cached_acl(inode, type).

ubifs/xattr.c needed includes reordered, the rest is a plain switchover.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-06-09 12:11:54 -04:00
parent 06b16e9f68
commit 073aaa1b14
10 changed files with 153 additions and 331 deletions
Download patch file Download diff file Expand all files Collapse all files

64
include/linux/posix_acl.h
View file

@ -83,4 +83,68 @@ extern int posix_acl_chmod_masq(struct posix_acl *, mode_t);
extern struct posix_acl *get_posix_acl(struct inode *, int);
extern int set_posix_acl(struct inode *, int, struct posix_acl *);
static inline struct posix_acl *get_cached_acl(struct inode *inode, int type)
{
struct posix_acl **p, *acl;
switch (type) {
case ACL_TYPE_ACCESS:
p = &inode->i_acl;
break;
case ACL_TYPE_DEFAULT:
p = &inode->i_default_acl;
break;
default:
return ERR_PTR(-EINVAL);
}
acl = ACCESS_ONCE(*p);
if (acl) {
spin_lock(&inode->i_lock);
acl = *p;
if (acl != ACL_NOT_CACHED)
acl = posix_acl_dup(acl);
spin_unlock(&inode->i_lock);
}
return acl;
}
static inline void set_cached_acl(struct inode *inode,
int type,
struct posix_acl *acl)
{
struct posix_acl *old = NULL;
spin_lock(&inode->i_lock);
switch (type) {
case ACL_TYPE_ACCESS:
old = inode->i_acl;
inode->i_acl = posix_acl_dup(acl);
break;
case ACL_TYPE_DEFAULT:
old = inode->i_default_acl;
inode->i_default_acl = posix_acl_dup(acl);
break;
}
spin_unlock(&inode->i_lock);
if (old != ACL_NOT_CACHED)
posix_acl_release(old);
}
static inline void forget_cached_acl(struct inode *inode, int type)
{
struct posix_acl *old = NULL;
spin_lock(&inode->i_lock);
switch (type) {
case ACL_TYPE_ACCESS:
old = inode->i_acl;
inode->i_acl = ACL_NOT_CACHED;
break;
case ACL_TYPE_DEFAULT:
old = inode->i_default_acl;
inode->i_default_acl = ACL_NOT_CACHED;
break;
}
spin_unlock(&inode->i_lock);
if (old != ACL_NOT_CACHED)
posix_acl_release(old);
}
#endif /* __LINUX_POSIX_ACL_H */