Signed-off-by: Philip Tricca <fl...@twobit.us>
---
.../e2fsprogs/misc-xattr-create-xattr-cache.patch | 181 +++++++++++++++++++++
.../e2fsprogs/e2fsprogs_1.42.9.bbappend | 1 +
2 files changed, 182 insertions(+)
create mode 100644
recipes-devtools/e2fsprogs/e2fsprogs/misc-xattr-create-xattr-cache.patch
diff --git
a/recipes-devtools/e2fsprogs/e2fsprogs/misc-xattr-create-xattr-cache.patch
b/recipes-devtools/e2fsprogs/e2fsprogs/misc-xattr-create-xattr-cache.patch
new file mode 100644
index 0000000..38e6454
--- /dev/null
+++ b/recipes-devtools/e2fsprogs/e2fsprogs/misc-xattr-create-xattr-cache.patch
@@ -0,0 +1,181 @@
+Implement the xattr block cache as an unsorted linked list. This requires the
+add and rm functions be able to test for equality between xattr blocks. This
+is implemented as two functions. The first compares individual entries and the
+second compares the whole xattr block by iterating over the individual entries.
+
+The xattr block cache keeps memory allocated on the heap around across
+invocations of the set_inode_xattr function. To free this memory we implement
+an xattr_cleanup function that iterates over the cache freeing resources
+associated with each node.
+
+Signed-off-by: Philip Tricca <fl...@twobit.us>
+
+Index: e2fsprogs-1.42.9/misc/xattr.c
+===================================================================
+--- e2fsprogs-1.42.9.orig/misc/xattr.c
++++ e2fsprogs-1.42.9/misc/xattr.c
+@@ -5,6 +5,7 @@
+ #include <errno.h>
+ #include <ext2fs/ext2_ext_attr.h>
+ #include <linux/xattr.h>
++#include <stdbool.h>
+ #include <stdint.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+@@ -25,6 +26,9 @@
+ #define XATTR_STDERR(fmt, args...) do {} while (0)
+ #endif
+
++static size_t cache_hit = 0;
++static size_t cache_miss = 0;
++
+ /* nodes for simple linked list to track xattr blocks, calling it a cache
+ * would be a stretch ...
+ */
+@@ -76,7 +80,18 @@ xattr_free_node (xattr_node_t *node)
+ void
+ xattr_cleanup ()
+ {
++ xattr_node_t *curr = NULL, *tmp = NULL;
++ size_t count = 0;
++
+ XATTR_STDERR ("Cleaning up resources from xattrs.\n");
++ for (curr = xattr_list_head; curr != NULL; ++count) {
++ tmp = curr;
++ curr = curr->next;
++ xattr_free_node (tmp);
++ }
++ XATTR_STDERR ("Freed %d xattr_node_ts.\n", count);
++ XATTR_STDERR ("Cache hits: %u\n", cache_hit);
++ XATTR_STDERR ("Cache miss: %u\n", cache_miss);
+ }
+
+ /* Get value for named xattr from file at path.
+@@ -284,6 +299,58 @@ out:
+ return ret;
+ }
+
++static bool
++xattr_entry_isequal (struct ext2_ext_attr_header *header_a,
++ struct ext2_ext_attr_entry *entry_a,
++ struct ext2_ext_attr_header *header_b,
++ struct ext2_ext_attr_entry *entry_b)
++{
++ if (entry_a->e_hash == entry_b->e_hash ||
++ entry_a->e_name_index == entry_b->e_name_index ||
++ entry_a->e_name_len == entry_b->e_name_len ||
++ entry_a->e_value_size == entry_b->e_value_size)
++ {
++ /* If entry header data all matches we check name and value */
++ if (memcmp (EXT2_EXT_ATTR_NAME(entry_a),
++ EXT2_EXT_ATTR_NAME(entry_b),
++ MIN (entry_a->e_name_len, entry_b->e_name_len))
!= 0)
++ return false;
++ if (memcmp (VALUE(header_a, entry_a),
++ VALUE(header_b, entry_b),
++ MIN(entry_a->e_value_size,
entry_b->e_value_size)) != 0)
++ return false;
++ return true;
++ } else {
++ return false;
++ }
++}
++
++static bool
++xattr_block_isequal (struct ext2_ext_attr_header *header_a,
++ struct ext2_ext_attr_header *header_b)
++{
++ struct ext2_ext_attr_entry *entry_a = NULL, *entry_b = NULL;
++
++ XATTR_STDERR ("equality test: xattr blocks at 0x%x and 0x%x\n",
header_a, header_b);
++ for (entry_a = FIRST_ENTRY(header_a), entry_b = FIRST_ENTRY(header_b);
++ !EXT2_EXT_IS_LAST_ENTRY(entry_a) &&
!EXT2_EXT_IS_LAST_ENTRY(entry_b);
++ entry_a = EXT2_EXT_ATTR_NEXT(entry_a), entry_b =
EXT2_EXT_ATTR_NEXT(entry_b))
++ {
++ if (!xattr_entry_isequal (header_a, entry_a, header_b,
entry_b)) {
++ /* bail as soon as we find entries that don't match */
++ XATTR_STDERR ("entries do not match\n");
++ return false;
++ }
++ }
++ /* Be sure we're on the last element from each block. */
++ if (EXT2_EXT_IS_LAST_ENTRY(entry_a) && EXT2_EXT_IS_LAST_ENTRY(entry_b))
{
++ XATTR_STDERR ("entries match\n");
++ return true;
++ } else {
++ return false;
++ }
++}
++
+ /* Add an xattr node to the list specified by head. This function will update
+ * head as necessary. It will return a pointer to the xattr_node_t added to
the
+ * list. In the event that an identical xattr block is already on the list
this
+@@ -292,7 +359,31 @@ out:
+ static xattr_node_t*
+ xattr_add_block (xattr_node_t **head, xattr_node_t *node)
+ {
++ xattr_node_t *curr_node = NULL, *prev_node = NULL;
++
+ XATTR_STDERR ("Adding xattr to the the node list.\n");
++ if (node == NULL)
++ return NULL;
++ /* list is empty, node becomes first node */
++ if (!(*head)) {
++ *head = node;
++ return node;
++ }
++ for (curr_node = *head; curr_node != NULL; curr_node = curr_node->next)
++ {
++ /* cache hit */
++ if (xattr_block_isequal (node->header, curr_node->header)) {
++ ++cache_hit;
++ return curr_node;
++ }
++ /* end of list */
++ if (curr_node->next == NULL) {
++ ++cache_miss;
++ curr_node->next = node;
++ return node;
++ }
++ }
++ /* should never reach: assert? */
+ return node;
+ }
+
+@@ -302,8 +393,27 @@ xattr_add_block (xattr_node_t **head, xa
+ static xattr_node_t*
+ xattr_rm_block (xattr_node_t **head, xattr_node_t *node)
+ {
++ xattr_node_t *curr_node = NULL, *prev_node = NULL;
++
+ XATTR_STDERR ("Removing xattr from the node list.\n");
+- return node;
++ /* no list, or empty list: nothing to search though */
++ if (!head || !(*head))
++ return NULL;
++
++ for (prev_node = NULL, curr_node = *head;
++ curr_node != NULL;
++ prev_node = curr_node, curr_node = curr_node->next)
++ {
++ if (node == curr_node) {
++ if (prev_node)
++ prev_node->next = curr_node->next;
++ else
++ *head = curr_node->next;
++ return curr_node;
++ }
++ }
++ /* reached end of list, no match */
++ return NULL;
+ }
+
+ /* This is the entry point to the xattr module. This function copies the
xattrs
+@@ -386,6 +496,7 @@ set_inode_xattr (ext2_filsys fs, ext2_in
+ }
+ if (ret = ext2fs_write_inode (fs, ino, &inode))
+ com_err(__func__, ret, "ext2fs_write_inode: returned %d", ret);
++ return ret;
+ out:
+ xattr_free_node (node);
+ return ret;
diff --git a/recipes-devtools/e2fsprogs/e2fsprogs_1.42.9.bbappend
b/recipes-devtools/e2fsprogs/e2fsprogs_1.42.9.bbappend
index 0705ec4..d8de9da 100644
--- a/recipes-devtools/e2fsprogs/e2fsprogs_1.42.9.bbappend
+++ b/recipes-devtools/e2fsprogs/e2fsprogs_1.42.9.bbappend
@@ -6,4 +6,5 @@ SRC_URI += " \
file://lib-ext2fs-ext2_ext_attr.h-add-xattr-index.patch \
file://misc-xattr-create-xattr-block.patch \
file://misc-xattr-create-xattr-block-node.patch \
+ file://misc-xattr-create-xattr-cache.patch \
"
--
2.1.4
--
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