Btrfs: Add simple stripe size parameter

Signed-off-by: Chris Mason <chris.mason@oracle.com>

3 files changed, 43 insertions, 13 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b29b911dd825..9bc1b0a8615f 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -135,6 +135,7 @@ struct btrfs_super_block {
         __le32 sectorsize;
         __le32 nodesize;
         __le32 leafsize;
+        __le32 stripesize;
         u8 root_level;
 } __attribute__ ((__packed__));
 
@@ -353,6 +354,8 @@ struct btrfs_root {
         /* leaf allocations are done in leafsize units */
         u32 leafsize;
 
+        u32 stripesize;
+
         u32 type;
         u64 highest_inode;
         u64 last_inode_alloc;
@@ -776,6 +779,8 @@ BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
                          nodesize, 32);
 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
                          leafsize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
+                         stripesize, 32);
 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
                          root_dir_objectid, 64);
 
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index eef4ab56b9ca..60a30da6af00 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -355,7 +355,7 @@ int wait_on_tree_block_writeback(struct btrfs_root *root,
 }
 
 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
-                        struct btrfs_root *root,
+                        u32 stripesize, struct btrfs_root *root,
                         struct btrfs_fs_info *fs_info,
                         u64 objectid)
 {
@@ -365,6 +365,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
         root->sectorsize = sectorsize;
         root->nodesize = nodesize;
         root->leafsize = leafsize;
+        root->stripesize = stripesize;
         root->ref_cows = 0;
         root->fs_info = fs_info;
         root->objectid = objectid;
@@ -393,7 +394,8 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
         u32 blocksize;
 
         __setup_root(tree_root->nodesize, tree_root->leafsize,
-                     tree_root->sectorsize, root, fs_info, objectid);
+                     tree_root->sectorsize, tree_root->stripesize,
+                     root, fs_info, objectid);
         ret = btrfs_find_last_root(tree_root, objectid,
                                    &root->root_item, &root->root_key);
         BUG_ON(ret);
@@ -430,8 +432,8 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
         }
 
         __setup_root(tree_root->nodesize, tree_root->leafsize,
-                     tree_root->sectorsize, root, fs_info,
-                     location->objectid);
+                     tree_root->sectorsize, tree_root->stripesize,
+                     root, fs_info, location->objectid);
 
         path = btrfs_alloc_path();
         BUG_ON(!path);
@@ -537,6 +539,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
         u32 nodesize;
         u32 leafsize;
         u32 blocksize;
+        u32 stripesize;
         struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
                                                  GFP_NOFS);
         struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
@@ -607,7 +610,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
                 goto fail_iput;
         }
 #endif
-        __setup_root(512, 512, 512, tree_root,
+        __setup_root(512, 512, 512, 512, tree_root,
                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 
         fs_info->sb_buffer = read_tree_block(tree_root,
@@ -630,9 +633,11 @@ struct btrfs_root *open_ctree(struct super_block *sb)
         nodesize = btrfs_super_nodesize(disk_super);
         leafsize = btrfs_super_leafsize(disk_super);
         sectorsize = btrfs_super_sectorsize(disk_super);
+        stripesize = btrfs_super_stripesize(disk_super);
         tree_root->nodesize = nodesize;
         tree_root->leafsize = leafsize;
         tree_root->sectorsize = sectorsize;
+        tree_root->stripesize = stripesize;
         sb_set_blocksize(sb, sectorsize);
 
         i_size_write(fs_info->btree_inode,
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 55abdf997ca5..91397e989393 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -932,6 +932,13 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
         return ret ? ret : pending_ret;
 }
 
+static u64 stripe_align(struct btrfs_root *root, u64 val)
+{
+        u64 mask = ((u64)root->stripesize - 1);
+        u64 ret = (val + mask) & ~mask;
+        return ret;
+}
+
 /*
  * walks the btree of allocated extents and find a hole of a given size.
  * The key ins is changed to record the hole:
@@ -948,8 +955,9 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 {
         struct btrfs_path *path;
         struct btrfs_key key;
-        int ret;
         u64 hole_size = 0;
+        u64 aligned;
+        int ret;
         int slot = 0;
         u64 last_byte = 0;
         u64 orig_search_start = search_start;
@@ -990,6 +998,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 check_failed:
         search_start = find_search_start(root, &block_group, search_start,
                                          total_needed, data, full_scan);
+        search_start = stripe_align(root, search_start);
         cached_start = search_start;
         btrfs_init_path(path);
         ins->objectid = search_start;
@@ -1039,13 +1048,23 @@ check_failed:
                         search_start = max(search_start,
                                            block_group->key.objectid);
                         if (!start_found) {
-                                ins->objectid = search_start;
-                                ins->offset = search_end - search_start;
+                                aligned = stripe_align(root, search_start);
+                                ins->objectid = aligned;
+                                if (aligned >= search_end) {
+                                        ret = -ENOSPC;
+                                        goto error;
+                                }
+                                ins->offset = search_end - aligned;
                                 start_found = 1;
                                 goto check_pending;
                         }
-                        ins->objectid = last_byte > search_start ?
-                                        last_byte : search_start;
+                        ins->objectid = stripe_align(root,
+                                                     last_byte > search_start ?
+                                                     last_byte : search_start);
+                        if (search_end <= ins->objectid) {
+                                ret = -ENOSPC;
+                                goto error;
+                        }
                         ins->offset = search_end - ins->objectid;
                         BUG_ON(ins->objectid >= search_end);
                         goto check_pending;
@@ -1056,9 +1075,10 @@ check_failed:
                     start_found) {
                         if (last_byte < search_start)
                                 last_byte = search_start;
-                        hole_size = key.objectid - last_byte;
-                        if (hole_size >= num_bytes) {
-                                ins->objectid = last_byte;
+                        aligned = stripe_align(root, last_byte);
+                        hole_size = key.objectid - aligned;
+                        if (key.objectid > aligned && hole_size >= num_bytes) {
+                                ins->objectid = aligned;
                                 ins->offset = hole_size;
                                 goto check_pending;
                         }