Add the overlapping limit and [limit_min, limit_max] members to the
balance args. The min/max values are interpreted iff the corresponding
flag BTRFS_BALANCE_ARGS_LIMITS is set.
Note that the values are only 32bit, but this should be enough for the
foreseeable future.
Signed-off-by: David Sterba <dste...@suse.com>
---
Documentation/btrfs-balance.asciidoc | 4 ++++
cmds-balance.c | 4 ++++
ioctl.h | 13 ++++++++++++-
volumes.h | 1 +
4 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/Documentation/btrfs-balance.asciidoc
b/Documentation/btrfs-balance.asciidoc
index 6d2fd0c36086..61517461ca90 100644
--- a/Documentation/btrfs-balance.asciidoc
+++ b/Documentation/btrfs-balance.asciidoc
@@ -109,6 +109,10 @@ parameters.
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.
++
+The argument may be a single value or a range. The single value *N* means *at
+most N chunks*, equivalent to *..N* range syntax. Kernels prior to 4.4 accept
+only the single value format.
*soft*::
Takes no parameters. Only has meaning when converting between profiles.
diff --git a/cmds-balance.c b/cmds-balance.c
index dba6613b1540..1eadba417abc 100644
--- a/cmds-balance.c
+++ b/cmds-balance.c
@@ -343,6 +343,10 @@ 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_LIMITS) {
+ printf(", limit=");
+ print_range_u32(args->limit_min, args->limit_max);
+ }
printf("\n");
}
diff --git a/ioctl.h b/ioctl.h
index dff015a52b43..ff7a1a0610a1 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -227,7 +227,18 @@ struct btrfs_balance_args {
__u64 flags;
- __u64 limit; /* limit number of processed chunks */
+ /*
+ * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
+ * BTRFS_BALANCE_ARGS_LIMITS - the extend version can use minimum and
+ * maximum
+ */
+ union {
+ __u64 limit; /* limit number of processed chunks */
+ struct {
+ __u32 limit_min;
+ __u32 limit_max;
+ };
+ };
__u64 unused[7];
} __attribute__ ((__packed__));
diff --git a/volumes.h b/volumes.h
index 4ecb99314a0c..cb6f5752cdda 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_LIMITS (1ULL << 6)
/*
* Profile changing flags. When SOFT is set we won't relocate chunk if
--
2.6.1
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