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Btrfs: Add simple stripe size parameter

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-11-30 11:30:34 -05:00
parent 00f5c795fc
commit 87ee04eb0f
3 changed files with 43 additions and 13 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
fs/btrfs/ctree.h
View file

@ -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);

15
fs/btrfs/disk-io.c
View file

@ -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,

36
fs/btrfs/extent-tree.c
View file

@ -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 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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;
}