From 23f8f9b7caca83d3397b1288a519c6579b7fda88 Mon Sep 17 00:00:00 2001 From: Gui Hecheng Date: Mon, 21 Apr 2014 20:13:12 +0800 Subject: [PATCH] btrfs: add dev maxs limit for __btrfs_alloc_chunk in kernel space For RAID0,5,6,10, For system chunk, there shouldn't be too many stripes to make a btrfs_chunk that exceeds BTRFS_SYSTEM_CHUNK_ARRAY_SIZE For data/meta chunk, there shouldn't be too many stripes to make a btrfs_chunk that exceeds a leaf. Signed-off-by: Gui Hecheng Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 5864f05243c2..8113f4567084 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4027,6 +4027,16 @@ static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type) btrfs_set_fs_incompat(info, RAID56); } +#define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r) \ + - sizeof(struct btrfs_item) \ + - sizeof(struct btrfs_chunk)) \ + / sizeof(struct btrfs_stripe) + 1) + +#define BTRFS_MAX_DEVS_SYS_CHUNK ((BTRFS_SYSTEM_CHUNK_ARRAY_SIZE \ + - 2 * sizeof(struct btrfs_disk_key) \ + - 2 * sizeof(struct btrfs_chunk)) \ + / sizeof(struct btrfs_stripe) + 1) + static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root, u64 start, u64 type) @@ -4076,6 +4086,8 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, if (type & BTRFS_BLOCK_GROUP_DATA) { max_stripe_size = 1024 * 1024 * 1024; max_chunk_size = 10 * max_stripe_size; + if (!devs_max) + devs_max = BTRFS_MAX_DEVS(info->chunk_root); } else if (type & BTRFS_BLOCK_GROUP_METADATA) { /* for larger filesystems, use larger metadata chunks */ if (fs_devices->total_rw_bytes > 50ULL * 1024 * 1024 * 1024) @@ -4083,9 +4095,13 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, else max_stripe_size = 256 * 1024 * 1024; max_chunk_size = max_stripe_size; + if (!devs_max) + devs_max = BTRFS_MAX_DEVS(info->chunk_root); } else if (type & BTRFS_BLOCK_GROUP_SYSTEM) { max_stripe_size = 32 * 1024 * 1024; max_chunk_size = 2 * max_stripe_size; + if (!devs_max) + devs_max = BTRFS_MAX_DEVS_SYS_CHUNK; } else { btrfs_err(info, "invalid chunk type 0x%llx requested\n", type);