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authorMiao Xie <miaox@cn.fujitsu.com>2013-07-03 21:25:17 +0800
committerChris Mason <chris.mason@fusionio.com>2013-07-03 14:06:55 -0400
commit30d5c8a49f088d76fb2806240393fc035ed75290 (patch)
treef5a1652ad936c259f1cbc653a61384b3b2a31c2a /disk-io.c
parent65534643f6e919c39f58bef31ebcffd48d8b1895 (diff)
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Btrfs-progs: Add chunk recover function - using old chunk items
Add chunk-recover program to check or rebuild chunk tree when the system chunk array or chunk tree is broken. Due to the importance of the system chunk array and chunk tree, if one of them is broken, the whole btrfs will be broken even other data are OK. But we have some hint(fsid, checksum...) to salvage the old metadata. So this function will first scan the whole file system and collect the needed data(chunk/block group/dev extent), and check for the references between them. If the references are OK, the chunk tree can be rebuilt and luckily the file system will be mountable. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'disk-io.c')
-rw-r--r--disk-io.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/disk-io.c b/disk-io.c
index 7140367..a41d166 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -70,8 +70,8 @@ void btrfs_csum_final(u32 crc, char *result)
*(__le32 *)result = ~cpu_to_le32(crc);
}
-int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
- int verify)
+static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
+ int verify, int silent)
{
char *result;
u32 len;
@@ -87,9 +87,11 @@ int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
if (verify) {
if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
- printk("checksum verify failed on %llu found %08X "
- "wanted %08X\n", (unsigned long long)buf->start,
- *((u32 *)result), *((u32*)(char *)buf->data));
+ if (!silent)
+ printk("checksum verify failed on %llu found %08X wanted %08X\n",
+ (unsigned long long)buf->start,
+ *((u32 *)result),
+ *((u32*)(char *)buf->data));
free(result);
return 1;
}
@@ -100,6 +102,16 @@ int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
return 0;
}
+int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
+{
+ return __csum_tree_block_size(buf, csum_size, verify, 0);
+}
+
+int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
+{
+ return __csum_tree_block_size(buf, csum_size, 1, 1);
+}
+
int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify)
{