@@ -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[507]; /* Make up the size of the structure to 4088
+ /* For FILTER_DEVID */
+ __u64 devid;
+
+ __u64 spare[506]; /* Make up the size of the structure to 4088
* bytes for future expansion */
};
@@ -2027,6 +2027,7 @@ 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)
@@ -2046,6 +2047,19 @@ 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 1;
}
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@carfax.org.uk> --- fs/btrfs/ioctl.h | 8 ++++++-- fs/btrfs/volumes.c | 14 ++++++++++++++ 2 files changed, 20 insertions(+), 2 deletions(-)