---
Documentation/btrfs-balance.asciidoc | 4 ++++
cmds-balance.c | 24 ++++++++++++++++++++++++
ioctl.h | 6 +++++-
volumes.h | 1 +
4 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/Documentation/btrfs-balance.asciidoc b/Documentation/btrfs-balance.asciidoc
index 6d2fd0c..8663855 100644
--- a/Documentation/btrfs-balance.asciidoc
+++ b/Documentation/btrfs-balance.asciidoc
@@ -110,6 +110,10 @@ Process only given number of chunks, after all filters apply. This can be used
to specifically target a chunk in connection with other filters (drange,
vrange) or just simply limit the amount of work done by a single balance run.
+*stripes*::
+Balances only block groups which have the given number of stripes. The
+parameter is either a range specified as <start..end>, or a single integer.
+
*soft*::
Takes no parameters. Only has meaning when converting between profiles.
When doing convert from one profile to another and soft mode is on,
diff --git a/cmds-balance.c b/cmds-balance.c
index 9af218b..c47f8b7 100644
--- a/cmds-balance.c
+++ b/cmds-balance.c
@@ -226,6 +226,21 @@ static int parse_filters(char *filters, struct btrfs_balance_args *args)
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
+ } else if (!strcmp(this_char, "stripes")) {
+ if (!value || !*value) {
+ fprintf(stderr,
+ "the stripes filter requires an argument\n");
+ return 1;
+ }
+ if (parse_u64(value, &args->sstart)) {
+ if (parse_range(value, &args->sstart, &args->send)) {
+ fprintf(stderr, "Invalid stripes argument\n");
+ return 1;
+ }
+ } else {
+ args->send = args->sstart;
+ }
+ args->flags |= BTRFS_BALANCE_ARGS_STRIPES;
} else {
fprintf(stderr, "Unrecognized balance option '%s'\n",
this_char);
@@ -262,6 +277,15 @@ static void dump_balance_args(struct btrfs_balance_args *args)
(unsigned long long)args->vend);
if (args->flags & BTRFS_BALANCE_ARGS_LIMIT)
printf(", limit=%llu", (unsigned long long)args->limit);
+ if (args->flags & BTRFS_BALANCE_ARGS_STRIPES) {
+ if (args->sstart == args->send) {
+ printf(", stripes=%llu", (unsigned long long)args->sstart);
+ } else {
+ printf(", stripes=%llu..%llu",
+ (unsigned long long)args->sstart,
+ (unsigned long long)args->send);
+ }
+ }
printf("\n");
}
diff --git a/ioctl.h b/ioctl.h
index dff015a..c1f6aec 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -228,7 +228,11 @@ struct btrfs_balance_args {
__u64 flags;
__u64 limit; /* limit number of processed chunks */
- __u64 unused[7];
+
+ __u64 sstart;
+ __u64 send;
+
+ __u64 unused[5];
} __attribute__ ((__packed__));
/* report balance progress to userspace */
diff --git a/volumes.h b/volumes.h
index 4ecb993..a809a78 100644
--- a/volumes.h
+++ b/volumes.h
@@ -136,6 +136,7 @@ struct map_lookup {
#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
+#define BTRFS_BALANCE_ARGS_STRIPES (1ULL << 6)
/*
* Profile changing flags. When SOFT is set we won't relocate chunk if
--
2.5.3
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