From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ilya Dryomov Subject: [PATCH 12/21] Btrfs: devid subset filter Date: Tue, 23 Aug 2011 23:01:53 +0300 Message-ID: <1314129722-31601-13-git-send-email-idryomov@gmail.com> References: <1314129722-31601-1-git-send-email-idryomov@gmail.com> Cc: Chris Mason , Hugo Mills , idryomov@gmail.com To: linux-btrfs@vger.kernel.org Return-path: In-Reply-To: <1314129722-31601-1-git-send-email-idryomov@gmail.com> List-ID: Select chunks which have at least one byte of at least one stripe located on a device with devid X in a given [pstart,pend) physical address range. This filter only works when devid filter is turned on. Signed-off-by: Ilya Dryomov --- fs/btrfs/volumes.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/volumes.h | 1 + 2 files changed, 46 insertions(+), 0 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index ce2a9e0..4393f6d 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2237,6 +2237,45 @@ static int chunk_devid_filter(struct extent_buffer *leaf, return 1; } +/* [pstart, pend) */ +static int chunk_drange_filter(struct extent_buffer *leaf, + struct btrfs_chunk *chunk, + u64 chunk_offset, + struct btrfs_restripe_args *rargs) +{ + struct btrfs_stripe *stripe; + int num_stripes = btrfs_chunk_num_stripes(leaf, chunk); + u64 stripe_offset; + u64 stripe_length; + int factor; + int i; + + BUG_ON(!(rargs->flags & BTRFS_RESTRIPE_ARGS_DEVID)); + + if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP | + BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10)) + factor = 2; + else + factor = 1; + factor = num_stripes / factor; + + for (i = 0; i < num_stripes; i++) { + stripe = btrfs_stripe_nr(chunk, i); + if (btrfs_stripe_devid(leaf, stripe) != rargs->devid) + continue; + + stripe_offset = btrfs_stripe_offset(leaf, stripe); + stripe_length = btrfs_chunk_length(leaf, chunk); + do_div(stripe_length, factor); + + if (stripe_offset < rargs->pend && + stripe_offset + stripe_length > rargs->pstart) + return 0; + } + + return 1; +} + static int chunk_soft_convert_filter(u64 chunk_profile, struct btrfs_restripe_args *rargs) { @@ -2292,6 +2331,12 @@ static int should_restripe_chunk(struct btrfs_root *root, return 0; } + /* drange filter, makes sense only with devid filter */ + if ((rargs->flags & BTRFS_RESTRIPE_ARGS_DRANGE) && + chunk_drange_filter(leaf, chunk, chunk_offset, rargs)) { + return 0; + } + /* soft profile changing mode */ if ((rargs->flags & BTRFS_RESTRIPE_ARGS_SOFT) && chunk_soft_convert_filter(chunk_type, rargs)) { diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 1b8dc3e..8d4bbcb 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -188,6 +188,7 @@ struct map_lookup { #define BTRFS_RESTRIPE_ARGS_PROFILES (1ULL << 0) #define BTRFS_RESTRIPE_ARGS_USAGE (1ULL << 1) #define BTRFS_RESTRIPE_ARGS_DEVID (1ULL << 2) +#define BTRFS_RESTRIPE_ARGS_DRANGE (1ULL << 3) /* * Profile changing flags. When SOFT is set we won't relocate chunk if -- 1.7.5.4