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authorChristoph Hellwig <hch@lst.de>2008-08-28 06:21:16 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:07 -0400
commiteaa47d8612783807ef9703ebc9bf0d0f0455bf62 (patch)
treeaae589fac6573e2974935b357bfa687dbab2e718 /fs/btrfs/xattr.c
parenteab922ec8907b8c506e799785e7e2d16eabe50e4 (diff)
downloadlinux-eaa47d8612783807ef9703ebc9bf0d0f0455bf62.tar.bz2
btrfs: optmize listxattr
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> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/xattr.c')
-rw-r--r--fs/btrfs/xattr.c82
1 files changed, 11 insertions, 71 deletions
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 121c9550314f..fdfece41dd16 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -51,35 +51,6 @@ struct xattr_handler *btrfs_xattr_handlers[] = {
};
/*
- * @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 *name, int name_index)
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 *dentry, char *buffer, size_t size)
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 *dentry, char *buffer, size_t size)
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_XATTR_INDEX_TRUSTED);
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,
};