Balance filter to take only chunks which have (or had) a stripe on the
given device. Useful if a device has been forcibly removed from the
filesystem, and the data from that device needs rebuilding.
Signed-off-by: Hugo Mills <hugo@xxxxxxxxxxxxx>
---
fs/btrfs/ioctl.h | 8 ++++++--
fs/btrfs/volumes.c | 16 +++++++++++++++-
2 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index eb91d20..54523c0 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -166,7 +166,8 @@ struct btrfs_ioctl_balance_progress {
#define BTRFS_BALANCE_FILTER_COUNT_ONLY (1 << 0)
#define BTRFS_BALANCE_FILTER_CHUNK_TYPE (1 << 1)
-#define BTRFS_BALANCE_FILTER_MASK ((1 << 2) - 1) /* Logical or of all filter
+#define BTRFS_BALANCE_FILTER_DEVID (1 << 2)
+#define BTRFS_BALANCE_FILTER_MASK ((1 << 3) - 1) /* Logical or of all filter
* flags -- effectively versions
* the filtered balance ioctl */
@@ -183,7 +184,10 @@ struct btrfs_ioctl_balance_start {
__u64 chunk_type; /* Flag bits required */
__u64 chunk_type_mask; /* Mask of bits to examine */
- __u64 spare[506]; /* Make up the size of the structure to 4088
+ /* For FILTER_DEVID */
+ __u64 devid;
+
+ __u64 spare[505]; /* Make up the size of the structure to 4088
* bytes for future expansion */
};
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 95c603a..e7fa2ab 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2036,6 +2036,7 @@ int balance_chunk_filter(struct btrfs_ioctl_balance_start *filter,
{
struct extent_buffer *eb;
struct btrfs_chunk *chunk;
+ int i;
/* No filter defined, everything matches */
if (!filter)
@@ -2056,8 +2057,21 @@ int balance_chunk_filter(struct btrfs_ioctl_balance_start *filter,
return 0;
}
}
+ if (filter->flags & BTRFS_BALANCE_FILTER_DEVID) {
+ int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
+ int res = 0;
+ for (i = 0; i < num_stripes; i++) {
+ struct btrfs_stripe *stripe = btrfs_stripe_nr(chunk, i);
+ if (btrfs_stripe_devid(eb, stripe) == filter->devid) {
+ res = 1;
+ break;
+ }
+ }
+ if (!res)
+ return 0;
+ }
- return ret;
+ return 1;
}
/* Define a type, and two functions which can be used for the two
--
1.7.2.5
--
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