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authorGui Hecheng <guihc.fnst@cn.fujitsu.com>2014-04-21 16:13:12 +0400
committerChris Mason <clm@fb.com>2014-06-10 04:20:36 +0400
commit23f8f9b7caca83d3397b1288a519c6579b7fda88 (patch)
tree5853816c24f3d48cc969bf80581451a110262551 /fs
parent5f43f86e3f62734dfeeb36c4d940425a2c6789dc (diff)
downloadlinux-23f8f9b7caca83d3397b1288a519c6579b7fda88.tar.xz
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 <guihc.fnst@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/volumes.c16
1 files changed, 16 insertions, 0 deletions
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);