Introduce a new option, --pattern, to specify the pattern to fill
mirror.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
Documentation/btrfs-modify.asciidoc | 5 +++++
modify/mirror.c | 11 ++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/Documentation/btrfs-modify.asciidoc b/Documentation/btrfs-modify.asciidoc
index ae2ada65..d82fb0df 100644
--- a/Documentation/btrfs-modify.asciidoc
+++ b/Documentation/btrfs-modify.asciidoc
@@ -41,6 +41,11 @@ stripe number 1.
P for RAID56 1st parity stripe. Only RAID5 and RAID6 support stripe number P.
Q for RAID6 2nd parity stripe.
+--pattern <pattern>::::
+Specify to pattern to modify the mirror data5f536652.
++
+Default value is "0x66524842" (ascii "BHRf", part of the btrfs magic "_BHRfS_M").
+
EXIT STATUS
-----------
*btrfs-modify* returns a zero exit status if all its operations succeed.
diff --git a/modify/mirror.c b/modify/mirror.c
index c89927f6..dd717fbe 100644
--- a/modify/mirror.c
+++ b/modify/mirror.c
@@ -373,13 +373,15 @@ int modify_mirror(int argc, char **argv)
char *device;
u64 length = (u64)-1;
u64 logical = (u64)-1;
+ u32 pattern = 0x66524842;
int stripe = STRIPE_UNINITILIZED;
int ret;
while (1) {
int c;
enum { GETOPT_VAL_LOGICAL = 257, GETOPT_VAL_LENGTH,
- GETOPT_VAL_STRIPE, GETOPT_VAL_ROOT_INO_OFFSET };
+ GETOPT_VAL_STRIPE, GETOPT_VAL_ROOT_INO_OFFSET,
+ GETOPT_VAL_PATTERN };
static const struct option long_options[] = {
{ "logical", required_argument, NULL,
GETOPT_VAL_LOGICAL },
@@ -388,6 +390,8 @@ int modify_mirror(int argc, char **argv)
{ "stripe", required_argument, NULL, GETOPT_VAL_STRIPE },
{ "root-ino-offset", required_argument, NULL,
GETOPT_VAL_ROOT_INO_OFFSET},
+ { "pattern", required_argument, NULL,
+ GETOPT_VAL_PATTERN},
{ NULL, 0, NULL, 0 }
};
@@ -407,6 +411,9 @@ int modify_mirror(int argc, char **argv)
case GETOPT_VAL_ROOT_INO_OFFSET:
parse_root_ino_offset(&dest, optarg);
break;
+ case GETOPT_VAL_PATTERN:
+ pattern = arg_strtou32(optarg);
+ break;
case '?':
case 'h':
usage(modify_mirror_usage);
@@ -439,6 +446,8 @@ int modify_mirror(int argc, char **argv)
stripe = 0;
}
+ memset(write_buf, pattern, sizeof(write_buf) / sizeof(pattern));
+
fs_info = open_ctree_fs_info(device, 0, 0, 0, OPEN_CTREE_WRITES);
if (!fs_info) {
error("failed to open btrfs on device %s\n", device);
--
2.12.2
--
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