sanitize xattr handler prototypes

Add a flags argument to struct xattr_handler and pass it to all xattr
handler methods.  This allows using the same methods for multiple
handlers, e.g. for the ACL methods which perform exactly the same action
for the access and default ACLs, just using a different underlying
attribute.  With a little more groundwork it'll also allow sharing the
methods for the regular user/trusted/secure handlers in extN, ocfs2 and
jffs2 like it's already done for xfs in this patch.

Also change the inode argument to the handlers to a dentry to allow
using the handlers mechnism for filesystems that require it later,
e.g. cifs.

[with GFS2 bits updated by Steven Whitehouse <swhiteho@redhat.com>]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 25 insertions, 62 deletions

diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index fbeaec762103..e3e47415d851 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -331,13 +331,14 @@ cleanup:
         return ret;
 }
 
-static size_t ocfs2_xattr_list_acl_access(struct inode *inode,
+static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry,
                                           char *list,
                                           size_t list_len,
                                           const char *name,
-                                          size_t name_len)
+                                          size_t name_len,
+                                          int type)
 {
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
         const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
 
         if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
@@ -348,13 +349,14 @@ static size_t ocfs2_xattr_list_acl_access(struct inode *inode,
         return size;
 }
 
-static size_t ocfs2_xattr_list_acl_default(struct inode *inode,
+static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry,
                                            char *list,
                                            size_t list_len,
                                            const char *name,
-                                           size_t name_len)
+                                           size_t name_len,
+                                           int type)
 {
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
         const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
 
         if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
@@ -365,19 +367,19 @@ static size_t ocfs2_xattr_list_acl_default(struct inode *inode,
         return size;
 }
 
-static int ocfs2_xattr_get_acl(struct inode *inode,
-                               int type,
-                               void *buffer,
-                               size_t size)
+static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name,
+                void *buffer, size_t size, int type)
 {
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
         struct posix_acl *acl;
         int ret;
 
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
         if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
                 return -EOPNOTSUPP;
 
-        acl = ocfs2_get_acl(inode, type);
+        acl = ocfs2_get_acl(dentry->d_inode, type);
         if (IS_ERR(acl))
                 return PTR_ERR(acl);
         if (acl == NULL)
@@ -388,35 +390,16 @@ static int ocfs2_xattr_get_acl(struct inode *inode,
         return ret;
 }
 
-static int ocfs2_xattr_get_acl_access(struct inode *inode,
-                                      const char *name,
-                                      void *buffer,
-                                      size_t size)
-{
-        if (strcmp(name, "") != 0)
-                return -EINVAL;
-        return ocfs2_xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
-}
-
-static int ocfs2_xattr_get_acl_default(struct inode *inode,
-                                       const char *name,
-                                       void *buffer,
-                                       size_t size)
-{
-        if (strcmp(name, "") != 0)
-                return -EINVAL;
-        return ocfs2_xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
-}
-
-static int ocfs2_xattr_set_acl(struct inode *inode,
-                               int type,
-                               const void *value,
-                               size_t size)
+static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name,
+                const void *value, size_t size, int flags, int type)
 {
+        struct inode *inode = dentry->d_inode;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         struct posix_acl *acl;
         int ret = 0;
 
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
         if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
                 return -EOPNOTSUPP;
 
@@ -442,38 +425,18 @@ cleanup:
         return ret;
 }
 
-static int ocfs2_xattr_set_acl_access(struct inode *inode,
-                                      const char *name,
-                                      const void *value,
-                                      size_t size,
-                                      int flags)
-{
-        if (strcmp(name, "") != 0)
-                return -EINVAL;
-        return ocfs2_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
-}
-
-static int ocfs2_xattr_set_acl_default(struct inode *inode,
-                                       const char *name,
-                                       const void *value,
-                                       size_t size,
-                                       int flags)
-{
-        if (strcmp(name, "") != 0)
-                return -EINVAL;
-        return ocfs2_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
-}
-
 struct xattr_handler ocfs2_xattr_acl_access_handler = {
         .prefix = POSIX_ACL_XATTR_ACCESS,
+        .flags  = ACL_TYPE_ACCESS,
         .list   = ocfs2_xattr_list_acl_access,
-        .get    = ocfs2_xattr_get_acl_access,
-        .set    = ocfs2_xattr_set_acl_access,
+        .get    = ocfs2_xattr_get_acl,
+        .set    = ocfs2_xattr_set_acl,
 };
 
 struct xattr_handler ocfs2_xattr_acl_default_handler = {
         .prefix = POSIX_ACL_XATTR_DEFAULT,
+        .flags  = ACL_TYPE_DEFAULT,
         .list   = ocfs2_xattr_list_acl_default,
-        .get    = ocfs2_xattr_get_acl_default,
-        .set    = ocfs2_xattr_set_acl_default,
+        .get    = ocfs2_xattr_get_acl,
+        .set    = ocfs2_xattr_set_acl,
 };