---
fs/reiser4/Makefile | 1
fs/reiser4/checksum.c | 29 +++++++++++++++++++++++++++
fs/reiser4/checksum.h | 39 +++++++++++++++++++++++++++++++++++++
fs/reiser4/plugin/node/node.c | 3 +-
fs/reiser4/plugin/node/node.h | 3 ++
fs/reiser4/plugin/node/node41.c | 42 +++++++++++++++++++++++++++++++---------
fs/reiser4/plugin/node/node41.h | 1
fs/reiser4/super.h | 1
fs/reiser4/super_ops.c | 7 ++++++
fs/reiser4/wander.c | 13 +++++++++++-
fs/reiser4/znode.c | 3 --
fs/reiser4/znode.h | 1
12 files changed, 130 insertions(+), 13 deletions(-)
--- a/fs/reiser4/plugin/node/node.h
+++ b/fs/reiser4/plugin/node/node.h
@@ -233,6 +233,9 @@ typedef struct node_plugin {
/* change plugin id of items which are in a node already. Currently it is Used in tail conversion for regular
* files */
int (*set_item_plugin) (coord_t * coord, item_id);
+ /* calculate and check/update znode's checksum
+ (if @check is true, then check, otherwise update) */
+ int (*csum)(znode *node, int check);
} node_plugin;
typedef enum {
--- a/fs/reiser4/Makefile
+++ b/fs/reiser4/Makefile
@@ -48,6 +48,7 @@ reiser4-y := \
safe_link.o \
blocknrlist.o \
discard.o \
+ checksum.o \
\
plugin/plugin.o \
plugin/plugin_set.o \
--- /dev/null
+++ b/fs/reiser4/checksum.c
@@ -0,0 +1,29 @@
+#include <linux/err.h>
+#include "debug.h"
+#include "checksum.h"
+
+int reiser4_init_csum_tfm(struct crypto_shash **tfm)
+{
+ *tfm = crypto_alloc_shash("crc32c", 0, 0);
+ if (IS_ERR(*tfm)) {
+ *tfm = NULL;
+ return 1;
+ }
+ return 0;
+}
+
+void reiser4_done_csum_tfm(struct crypto_shash *tfm)
+{
+ crypto_free_shash(tfm);
+}
+
+/*
+ Local variables:
+ c-indentation-style: "K&R"
+ mode-name: "LC"
+ c-basic-offset: 8
+ tab-width: 8
+ fill-column: 120
+ scroll-step: 1
+ End:
+*/
--- /dev/null
+++ b/fs/reiser4/checksum.h
@@ -0,0 +1,39 @@
+#ifndef __CHECKSUM__
+#define __CHECKSUM__
+
+#include <crypto/hash.h>
+
+int reiser4_init_csum_tfm(struct crypto_shash **tfm);
+void reiser4_done_csum_tfm(struct crypto_shash *tfm);
+u32 static inline reiser4_crc32c(struct crypto_shash *tfm,
+ u32 crc, const void *address,
+ unsigned int length)
+{
+ struct {
+ struct shash_desc shash;
+ char ctx[4];
+ } desc;
+ int err;
+
+ desc.shash.tfm = tfm;
+ desc.shash.flags = 0;
+ *(u32 *)desc.ctx = crc;
+
+ err = crypto_shash_update(&desc.shash, address, length);
+ BUG_ON(err);
+ return *(u32 *)desc.ctx;
+}
+
+#endif /* __CHECKSUM__ */
+
+/*
+ Local variables:
+ c-indentation-style: "K&R"
+ mode-name: "LC"
+ c-basic-offset: 8
+ tab-width: 8
+ fill-column: 120
+ scroll-step: 1
+ End:
+*/
+
--- a/fs/reiser4/plugin/node/node.c
+++ b/fs/reiser4/plugin/node/node.c
@@ -153,7 +153,8 @@ node_plugin node_plugins[LAST_NODE_ID] =
.fast_cut = fast_cut_node40,
.max_item_size = max_item_size_node41,
.prepare_removal = prepare_removal_node40,
- .set_item_plugin = set_item_plugin_node40
+ .set_item_plugin = set_item_plugin_node40,
+ .csum = csum_node41
}
};
--- a/fs/reiser4/super_ops.c
+++ b/fs/reiser4/super_ops.c
@@ -6,6 +6,7 @@
#include "ktxnmgrd.h"
#include "flush.h"
#include "safe_link.h"
+#include "checksum.h"
#include <linux/vfs.h>
#include <linux/writeback.h>
@@ -249,6 +250,7 @@ static void reiser4_put_super(struct sup
get_super_private(super)->df_plug->release(super);
reiser4_done_formatted_fake(super);
+ reiser4_done_csum_tfm(sbinfo->csum_tfm);
/* stop daemons: ktxnmgr and entd */
reiser4_done_entd(super);
@@ -514,6 +516,10 @@ static int fill_super(struct super_block
goto failed_init_sinfo;
sbinfo = get_super_private(super);
+
+ if ((result = reiser4_init_csum_tfm(&sbinfo->csum_tfm)) != 0)
+ goto failed_init_csum_tfm;
+
/* initialize various reiser4 parameters, parse mount options */
if ((result = reiser4_init_super_data(super, data)) != 0)
goto failed_init_super_data;
@@ -592,6 +598,7 @@ static int fill_super(struct super_block
failed_init_super_data:
reiser4_done_fs_info(super);
failed_init_sinfo:
+ failed_init_csum_tfm:
reiser4_exit_context(&ctx);
return result;
}
--- a/fs/reiser4/plugin/node/node41.c
+++ b/fs/reiser4/plugin/node/node41.c
@@ -17,6 +17,7 @@
#include "../../tap.h"
#include "../../tree.h"
#include "../../super.h"
+#include "../../checksum.h"
#include "../../reiser4.h"
#include <asm/uaccess.h>
@@ -27,7 +28,7 @@
* node41 layout it almost the same as node40:
* node41_header is at the beginning and a table of item headers
* is at the end. Ther difference is that node41_header contains
- * a 32-bit reference counter (see node41.h)
+ * a 32-bit checksum (see node41.h)
*/
static const __u32 REISER4_NODE41_MAGIC = 0x19051966;
@@ -41,12 +42,41 @@ static inline node41_header *node41_node
return (node41_header *)zdata(node);
}
+int csum_node41(znode *node, int check)
+{
+ __u32 cpu_csum;
+
+ cpu_csum = reiser4_crc32c(get_current_super_private()->csum_tfm,
+ ~0,
+ zdata(node),
+ sizeof(struct node40_header));
+ cpu_csum = reiser4_crc32c(get_current_super_private()->csum_tfm,
+ cpu_csum,
+ zdata(node) + sizeof(struct node41_header),
+ reiser4_get_current_sb()->s_blocksize -
+ sizeof(node41_header));
+ if (check)
+ return cpu_csum == nh41_get_csum(node41_node_header(node));
+ else {
+ nh41_set_csum(node41_node_header(node), cpu_csum);
+ return 1;
+ }
+}
+
/*
* plugin->u.node.parse
* look for description of this method in plugin/node/node.h
*/
int parse_node41(znode *node /* node to parse */)
{
+ int ret;
+
+ ret = csum_node41(node, 1/* check */);
+ if (!ret)
+ warning("edward-1645",
+ "block %llu: bad checksum. FSCK?",
+ *jnode_get_block(ZJNODE(node)));
+
return parse_node40_common(node, REISER4_NODE41_MAGIC);
}
@@ -56,14 +86,8 @@ int parse_node41(znode *node /* node to
*/
int init_node41(znode *node /* node to initialise */)
{
- node41_header *header41;
-
- init_node40_common(node, node_plugin_by_id(NODE41_ID),
- sizeof(node41_header), REISER4_NODE41_MAGIC);
-
- header41 = node41_node_header(node);
- nh41_set_csum(header41, 0);
- return 0;
+ return init_node40_common(node, node_plugin_by_id(NODE41_ID),
+ sizeof(node41_header), REISER4_NODE41_MAGIC);
}
/*
--- a/fs/reiser4/plugin/node/node41.h
+++ b/fs/reiser4/plugin/node/node41.h
@@ -29,6 +29,7 @@ int max_item_size_node41(void);
int shift_node41(coord_t *from, znode *to, shift_direction pend,
int delete_child, int including_stop_coord,
carry_plugin_info *info);
+int csum_node41(znode *node, int check);
#ifdef GUESS_EXISTS
int guess_node41(const znode * node);
--- a/fs/reiser4/znode.c
+++ b/fs/reiser4/znode.c
@@ -635,7 +635,7 @@ int zload_ra(znode * node /* znode to lo
}
/* load content of node into memory */
-int zload(znode * node)
+int zload(znode *node)
{
return zload_ra(node, NULL);
}
@@ -651,7 +651,6 @@ int zinit_new(znode * node /* znode to i
void zrelse(znode * node /* znode to release references to */ )
{
assert("nikita-1381", znode_invariant(node));
-
jrelse(ZJNODE(node));
}
--- a/fs/reiser4/super.h
+++ b/fs/reiser4/super.h
@@ -275,6 +275,7 @@ struct reiser4_super_info_data {
* more details
*/
struct d_cursor_info d_info;
+ struct crypto_shash *csum_tfm;
#ifdef CONFIG_REISER4_BADBLOCKS
/* Alternative master superblock offset (in bytes) */
--- a/fs/reiser4/wander.c
+++ b/fs/reiser4/wander.c
@@ -769,8 +769,19 @@ static int write_jnodes_to_disk_extent(
JF_SET(cur, JNODE_WRITEBACK);
JF_CLR(cur, JNODE_DIRTY);
ON_DEBUG(cur->written++);
- spin_unlock_jnode(cur);
+ assert("edward-1647",
+ ergo(jnode_is_znode(cur), JF_ISSET(cur, JNODE_PARSED)));
+ spin_unlock_jnode(cur);
+ /*
+ * update checksum
+ */
+ if (jnode_is_znode(cur)) {
+ zload(JZNODE(cur));
+ if (node_plugin_by_node(JZNODE(cur))->csum)
+ node_plugin_by_node(JZNODE(cur))->csum(JZNODE(cur), 0);
+ zrelse(JZNODE(cur));
+ }
ClearPageError(pg);
set_page_writeback(pg);
--- a/fs/reiser4/znode.h
+++ b/fs/reiser4/znode.h
@@ -172,6 +172,7 @@ extern int zload_ra(znode * node, ra_inf
extern int zinit_new(znode * node, gfp_t gfp_flags);
extern void zrelse(znode * node);
extern void znode_change_parent(znode * new_parent, reiser4_block_nr * block);
+extern void znode_update_csum(znode *node);
/* size of data in znode */
static inline unsigned
