From: Robin Dong <san...@taobao.com>
Using mkfs.btrfs like:
mkfs.btrfs -l 131072 /dev/sda
will return no error, but after mount it, the dmesg will report:
BTRFS: couldn't mount because metadata blocksize (131072) was too large
The leafsize and nodesize are equal at present, so we just use one function
"check_leaf_or_node_size" to limit leaf and node size below
BTRFS_MAX_METADATA_BLOCKSIZE.
Signed-off-by: Robin Dong <san...@taobao.com>
---
v2 <- v1:
- add function check_leaf_or_node_size to limit leafsize and nodesize.
v3 <- v2:
- add quota string "sectorsize".
ctree.h | 6 ++++++
mkfs.c | 29 +++++++++++++++++++++++------
2 files changed, 29 insertions(+), 6 deletions(-)
diff --git a/ctree.h b/ctree.h
index 7f55229..75c1e0a 100644
--- a/ctree.h
+++ b/ctree.h
@@ -111,6 +111,12 @@ struct btrfs_trans_handle;
#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
/*
+ * the max metadata block size. This limit is somewhat artificial,
+ * but the memmove costs go through the roof for larger blocks.
+ */
+#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
+
+/*
* we can actually store much bigger names, but lets not confuse the rest
* of linux
*/
diff --git a/mkfs.c b/mkfs.c
index dff5eb8..93672b9 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1201,6 +1201,27 @@ static int zero_output_file(int out_fd, u64 size, u32
sectorsize)
return ret;
}
+static int check_leaf_or_node_size(u32 size, u32 sectorsize)
+{
+ if (size < sectorsize) {
+ fprintf(stderr,
+ "Illegal leafsize (or nodesize) %u (smaller than
sectorsize %u)\n",
+ size, sectorsize);
+ return -1;
+ } else if (size > BTRFS_MAX_METADATA_BLOCKSIZE) {
+ fprintf(stderr,
+ "Illegal leafsize (or nodesize) %u (larger than %u)\n",
+ size, BTRFS_MAX_METADATA_BLOCKSIZE);
+ return -1;
+ } else if (size & (sectorsize - 1)) {
+ fprintf(stderr,
+ "Illegal leafsize (or nodesize) %u (not aligned to
%u)\n",
+ size, sectorsize);
+ return -1;
+ }
+ return 0;
+}
+
int main(int ac, char **av)
{
char *file;
@@ -1291,14 +1312,10 @@ int main(int ac, char **av)
}
}
sectorsize = max(sectorsize, (u32)getpagesize());
- if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
- fprintf(stderr, "Illegal leafsize %u\n", leafsize);
+ if (check_leaf_or_node_size(leafsize, sectorsize))
exit(1);
- }
- if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
- fprintf(stderr, "Illegal nodesize %u\n", nodesize);
+ if (check_leaf_or_node_size(nodesize, sectorsize))
exit(1);
- }
ac = ac - optind;
if (ac == 0)
print_usage();
--
1.7.3.2
--
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