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authorChristoph Hellwig <hch@infradead.org>2013-12-20 05:16:38 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2014-01-25 23:58:16 -0500
commit2982baa2ae31eb23ce29b688ab2f77eb019062f3 (patch)
tree6c4046b236c983f2a8bdc3a760edb71de01fa33e
parent5c8ebd57b6a51daf53f75b7a16c45090a98a91a4 (diff)
fs: add get_acl helper
Factor out the code to get an ACL either from the inode or disk from check_acl, so that it can be used elsewhere later on. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/namei.c24
-rw-r--r--fs/posix_acl.c27
-rw-r--r--include/linux/posix_acl.h2
3 files changed, 32 insertions, 21 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 3531deebad30..bcb838e2e52f 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -235,27 +235,9 @@ static int check_acl(struct inode *inode, int mask)
return posix_acl_permission(inode, acl, mask & ~MAY_NOT_BLOCK);
}
- acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
-
- /*
- * A filesystem can force a ACL callback by just never filling the
- * ACL cache. But normally you'd fill the cache either at inode
- * instantiation time, or on the first ->get_acl call.
- *
- * If the filesystem doesn't have a get_acl() function at all, we'll
- * just create the negative cache entry.
- */
- if (acl == ACL_NOT_CACHED) {
- if (inode->i_op->get_acl) {
- acl = inode->i_op->get_acl(inode, ACL_TYPE_ACCESS);
- if (IS_ERR(acl))
- return PTR_ERR(acl);
- } else {
- set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
- return -EAGAIN;
- }
- }
-
+ acl = get_acl(inode, ACL_TYPE_ACCESS);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
if (acl) {
int error = posix_acl_permission(inode, acl, mask);
posix_acl_release(acl);
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 359d70b0e947..30524de49a6b 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -26,6 +26,33 @@ EXPORT_SYMBOL(posix_acl_valid);
EXPORT_SYMBOL(posix_acl_equiv_mode);
EXPORT_SYMBOL(posix_acl_from_mode);
+struct posix_acl *get_acl(struct inode *inode, int type)
+{
+ struct posix_acl *acl;
+
+ acl = get_cached_acl(inode, type);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
+
+ if (!IS_POSIXACL(inode))
+ return NULL;
+
+ /*
+ * A filesystem can force a ACL callback by just never filling the
+ * ACL cache. But normally you'd fill the cache either at inode
+ * instantiation time, or on the first ->get_acl call.
+ *
+ * If the filesystem doesn't have a get_acl() function at all, we'll
+ * just create the negative cache entry.
+ */
+ if (!inode->i_op->get_acl) {
+ set_cached_acl(inode, type, NULL);
+ return NULL;
+ }
+ return inode->i_op->get_acl(inode, type);
+}
+EXPORT_SYMBOL(get_acl);
+
/*
* Init a fresh posix_acl
*/
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 7931efe71175..a8d9918c0b20 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -175,4 +175,6 @@ static inline void cache_no_acl(struct inode *inode)
#endif
}
+struct posix_acl *get_acl(struct inode *inode, int type);
+
#endif /* __LINUX_POSIX_ACL_H */