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-rw-r--r--fs/posix_acl.c84
1 files changed, 79 insertions, 5 deletions
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 8bd2135b7f82..021e7c069b86 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -22,11 +22,80 @@
#include <linux/errno.h>
-EXPORT_SYMBOL(posix_acl_init);
-EXPORT_SYMBOL(posix_acl_alloc);
-EXPORT_SYMBOL(posix_acl_valid);
-EXPORT_SYMBOL(posix_acl_equiv_mode);
-EXPORT_SYMBOL(posix_acl_from_mode);
+struct posix_acl **acl_by_type(struct inode *inode, int type)
+{
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ return &inode->i_acl;
+ case ACL_TYPE_DEFAULT:
+ return &inode->i_default_acl;
+ default:
+ BUG();
+ }
+}
+EXPORT_SYMBOL(acl_by_type);
+
+struct posix_acl *get_cached_acl(struct inode *inode, int type)
+{
+ struct posix_acl **p = acl_by_type(inode, type);
+ struct posix_acl *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;
+}
+EXPORT_SYMBOL(get_cached_acl);
+
+struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type)
+{
+ return rcu_dereference(*acl_by_type(inode, type));
+}
+EXPORT_SYMBOL(get_cached_acl_rcu);
+
+void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl)
+{
+ struct posix_acl **p = acl_by_type(inode, type);
+ struct posix_acl *old;
+ spin_lock(&inode->i_lock);
+ old = *p;
+ rcu_assign_pointer(*p, posix_acl_dup(acl));
+ spin_unlock(&inode->i_lock);
+ if (old != ACL_NOT_CACHED)
+ posix_acl_release(old);
+}
+EXPORT_SYMBOL(set_cached_acl);
+
+void forget_cached_acl(struct inode *inode, int type)
+{
+ struct posix_acl **p = acl_by_type(inode, type);
+ struct posix_acl *old;
+ spin_lock(&inode->i_lock);
+ old = *p;
+ *p = ACL_NOT_CACHED;
+ spin_unlock(&inode->i_lock);
+ if (old != ACL_NOT_CACHED)
+ posix_acl_release(old);
+}
+EXPORT_SYMBOL(forget_cached_acl);
+
+void forget_all_cached_acls(struct inode *inode)
+{
+ struct posix_acl *old_access, *old_default;
+ spin_lock(&inode->i_lock);
+ old_access = inode->i_acl;
+ old_default = inode->i_default_acl;
+ inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED;
+ spin_unlock(&inode->i_lock);
+ if (old_access != ACL_NOT_CACHED)
+ posix_acl_release(old_access);
+ if (old_default != ACL_NOT_CACHED)
+ posix_acl_release(old_default);
+}
+EXPORT_SYMBOL(forget_all_cached_acls);
/*
* Init a fresh posix_acl
@@ -37,6 +106,7 @@ posix_acl_init(struct posix_acl *acl, int count)
atomic_set(&acl->a_refcount, 1);
acl->a_count = count;
}
+EXPORT_SYMBOL(posix_acl_init);
/*
* Allocate a new ACL with the specified number of entries.
@@ -51,6 +121,7 @@ posix_acl_alloc(int count, gfp_t flags)
posix_acl_init(acl, count);
return acl;
}
+EXPORT_SYMBOL(posix_acl_alloc);
/*
* Clone an ACL.
@@ -146,6 +217,7 @@ posix_acl_valid(const struct posix_acl *acl)
return 0;
return -EINVAL;
}
+EXPORT_SYMBOL(posix_acl_valid);
/*
* Returns 0 if the acl can be exactly represented in the traditional
@@ -186,6 +258,7 @@ posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p)
*mode_p = (*mode_p & ~S_IRWXUGO) | mode;
return not_equiv;
}
+EXPORT_SYMBOL(posix_acl_equiv_mode);
/*
* Create an ACL representing the file mode permission bits of an inode.
@@ -207,6 +280,7 @@ posix_acl_from_mode(umode_t mode, gfp_t flags)
acl->a_entries[2].e_perm = (mode & S_IRWXO);
return acl;
}
+EXPORT_SYMBOL(posix_acl_from_mode);
/*
* Return 0 if current is granted want access to the inode