The ->list handler is really not useful at all, because we always call
btrfs_xattr_generic_list anyway. After this is done
find_btrfs_xattr_handler becomes unused, and it becomes obvious that the
temporary name buffer allocation isn''t needed but we can directly copy
into the supplied buffer.
Tested with various getfattr -d calls on varying xattr lists.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Index: btrfs-unstable/acl.c
==================================================================---
btrfs-unstable.orig/acl.c 2008-08-21 22:07:12.000000000 -0300
+++ btrfs-unstable/acl.c 2008-08-21 22:07:32.000000000 -0300
@@ -318,14 +318,12 @@ int btrfs_acl_chmod(struct inode *inode)
struct xattr_handler btrfs_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
- .list = btrfs_xattr_generic_list,
.get = btrfs_xattr_acl_default_get,
.set = btrfs_xattr_acl_default_set,
};
struct xattr_handler btrfs_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
- .list = btrfs_xattr_generic_list,
.get = btrfs_xattr_acl_access_get,
.set = btrfs_xattr_acl_access_set,
};
Index: btrfs-unstable/xattr.c
==================================================================---
btrfs-unstable.orig/xattr.c 2008-08-21 22:07:12.000000000 -0300
+++ btrfs-unstable/xattr.c 2008-08-21 22:16:37.000000000 -0300
@@ -51,35 +51,6 @@ struct xattr_handler *btrfs_xattr_handle
};
/*
- * @param name - the xattr name
- * @return - the xattr_handler for the xattr, NULL if its not found
- *
- * use this with listxattr where we don''t already know the type of
xattr we
- * have
- */
-static struct xattr_handler *find_btrfs_xattr_handler(struct extent_buffer *l,
- unsigned long name_ptr,
- u16 name_len)
-{
- struct xattr_handler *handler = NULL;
- int i = 0;
-
- for (handler = btrfs_xattr_handlers[i]; handler != NULL; i++,
- handler = btrfs_xattr_handlers[i]) {
- u16 prefix_len = strlen(handler->prefix);
-
- if (name_len < prefix_len)
- continue;
-
- if (memcmp_extent_buffer(l, handler->prefix, name_ptr,
- prefix_len) == 0)
- break;
- }
-
- return handler;
-}
-
-/*
* @param name_index - the index for the xattr handler
* @return the xattr_handler if we found it, NULL otherwise
*
@@ -118,19 +89,6 @@ static inline char *get_name(const char
return ret;
}
-size_t btrfs_xattr_generic_list(struct inode *inode, char *list,
- size_t list_size, const char *name,
- size_t name_len)
-{
- if (list && (name_len+1) <= list_size) {
- memcpy(list, name, name_len);
- list[name_len] = ''\0'';
- } else
- return -ERANGE;
-
- return name_len+1;
-}
-
ssize_t btrfs_xattr_get(struct inode *inode, int name_index,
const char *attr_name, void *buffer, size_t size)
{
@@ -278,11 +236,10 @@ ssize_t btrfs_listxattr(struct dentry *d
struct btrfs_item *item;
struct extent_buffer *leaf;
struct btrfs_dir_item *di;
- struct xattr_handler *handler;
int ret = 0, slot, advance;
- size_t total_size = 0, size_left = size, written;
+ size_t total_size = 0, size_left = size;
unsigned long name_ptr;
- char *name;
+ size_t name_len;
u32 nritems;
/*
@@ -344,37 +301,24 @@ ssize_t btrfs_listxattr(struct dentry *d
di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
- total_size += btrfs_dir_name_len(leaf, di)+1;
+ name_len = btrfs_dir_name_len(leaf, di);
+ total_size += name_len + 1;
/* we are just looking for how big our buffer needs to be */
if (!size)
continue;
- /* find our handler for this xattr */
- name_ptr = (unsigned long)(di + 1);
- handler = find_btrfs_xattr_handler(leaf, name_ptr,
- btrfs_dir_name_len(leaf, di));
- if (!handler) {
- printk(KERN_ERR "btrfs: unsupported xattr found\n");
- continue;
- }
-
- name = kmalloc(btrfs_dir_name_len(leaf, di), GFP_KERNEL);
- read_extent_buffer(leaf, name, name_ptr,
- btrfs_dir_name_len(leaf, di));
-
- /* call the list function associated with this xattr */
- written = handler->list(inode, buffer, size_left, name,
- btrfs_dir_name_len(leaf, di));
- kfree(name);
-
- if (written < 0) {
+ if (!buffer || (name_len + 1) > size_left) {
ret = -ERANGE;
break;
}
- size_left -= written;
- buffer += written;
+ name_ptr = (unsigned long)(di + 1);
+ read_extent_buffer(leaf, buffer, name_ptr, name_len);
+ buffer[name_len] = ''\0'';
+
+ size_left -= name_len + 1;
+ buffer += name_len + 1;
}
ret = total_size;
@@ -412,28 +356,24 @@ BTRFS_XATTR_SETGET_FUNCS(trusted, BTRFS_
struct xattr_handler btrfs_xattr_security_handler = {
.prefix = XATTR_SECURITY_PREFIX,
- .list = btrfs_xattr_generic_list,
.get = btrfs_xattr_security_get,
.set = btrfs_xattr_security_set,
};
struct xattr_handler btrfs_xattr_system_handler = {
.prefix = XATTR_SYSTEM_PREFIX,
- .list = btrfs_xattr_generic_list,
.get = btrfs_xattr_system_get,
.set = btrfs_xattr_system_set,
};
struct xattr_handler btrfs_xattr_user_handler = {
.prefix = XATTR_USER_PREFIX,
- .list = btrfs_xattr_generic_list,
.get = btrfs_xattr_user_get,
.set = btrfs_xattr_user_set,
};
struct xattr_handler btrfs_xattr_trusted_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
- .list = btrfs_xattr_generic_list,
.get = btrfs_xattr_trusted_get,
.set = btrfs_xattr_trusted_set,
};
Index: btrfs-unstable/xattr.h
==================================================================---
btrfs-unstable.orig/xattr.h 2008-08-21 22:07:12.000000000 -0300
+++ btrfs-unstable/xattr.h 2008-08-21 22:07:32.000000000 -0300
@@ -47,12 +47,4 @@ ssize_t btrfs_xattr_get(struct inode *in
int btrfs_xattr_set(struct inode *inode, int name_index, const char *name,
const void *value, size_t size, int flags);
-/*
- * the only reason this is public is for acl.c. There may be a point where
- * acl.c doesn''t need it, and if thats the case we need to remove it
and make
- * it static in xattr.c
- */
-size_t btrfs_xattr_generic_list(struct inode *inode, char *list,
- size_t list_size, const char *name,
- size_t name_len);
#endif /* __XATTR__ */
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