From e20d96d64f9cf9288ffecc9ad4714e91c3b97ca8 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Thu, 22 Mar 2007 12:13:20 -0400 Subject: [PATCH] Mountable btrfs, with readdir Signed-off-by: Chris Mason --- fs/btrfs/Makefile | 5 +- fs/btrfs/ctree.c | 273 ++++++++++++++++++++------------------- fs/btrfs/ctree.h | 62 +++++++-- fs/btrfs/dir-item.c | 17 +-- fs/btrfs/disk-io.c | 281 ++++++++++++----------------------------- fs/btrfs/disk-io.h | 51 ++++---- fs/btrfs/extent-tree.c | 144 +++++++++++---------- fs/btrfs/hash.c | 9 ++ fs/btrfs/inode-map.c | 8 +- fs/btrfs/print-tree.c | 20 ++- fs/btrfs/print-tree.h | 2 +- fs/btrfs/root-tree.c | 4 +- fs/btrfs/super.c | 261 +++++++++++++++++++++++++++++++++++--- fs/btrfs/transaction.h | 4 +- 14 files changed, 651 insertions(+), 490 deletions(-) diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index 99e45a54ebd6..1a0fb7422393 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -2,7 +2,8 @@ ifneq ($(KERNELRELEASE),) # kbuild part of makefile obj-m := btrfs.o -btrfs-y := super.o +btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ + hash.o file-item.o inode-item.o inode-map.o disk-io.o #btrfs-y := ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \ # root-tree.o dir-item.o hash.o file-item.o inode-item.o \ @@ -14,7 +15,7 @@ else KERNELDIR := /lib/modules/`uname -r`/build all:: - $(MAKE) -C $(KERNELDIR) M=`pwd` modules + $(MAKE) C=1 -C $(KERNELDIR) M=`pwd` modules clean:: rm *.o btrfs.ko endif diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 9fbd07c37fde..e690e2bb47d2 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -7,11 +7,11 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int data_size); static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_buffer *dst, struct btrfs_buffer + *root, struct buffer_head *dst, struct buffer_head *src); static int balance_node_right(struct btrfs_trans_handle *trans, struct - btrfs_root *root, struct btrfs_buffer *dst_buf, - struct btrfs_buffer *src_buf); + btrfs_root *root, struct buffer_head *dst_buf, + struct buffer_head *src_buf); static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level, int slot); @@ -32,32 +32,34 @@ void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p) } static int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_buffer *buf, struct btrfs_buffer - *parent, int parent_slot, struct btrfs_buffer + *root, struct buffer_head *buf, struct buffer_head + *parent, int parent_slot, struct buffer_head **cow_ret) { - struct btrfs_buffer *cow; + struct buffer_head *cow; + struct btrfs_node *cow_node; - if (!list_empty(&buf->dirty)) { + if (!buffer_dirty(buf)) { *cow_ret = buf; return 0; } cow = btrfs_alloc_free_block(trans, root); - memcpy(&cow->node, &buf->node, root->blocksize); - btrfs_set_header_blocknr(&cow->node.header, cow->blocknr); + cow_node = btrfs_buffer_node(cow); + memcpy(cow_node, btrfs_buffer_node(buf), root->blocksize); + btrfs_set_header_blocknr(&cow_node->header, cow->b_blocknr); *cow_ret = cow; btrfs_inc_ref(trans, root, buf); if (buf == root->node) { root->node = cow; - cow->count++; + get_bh(cow); if (buf != root->commit_root) - btrfs_free_extent(trans, root, buf->blocknr, 1, 1); + btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1); btrfs_block_release(root, buf); } else { - btrfs_set_node_blockptr(&parent->node, parent_slot, - cow->blocknr); - BUG_ON(list_empty(&parent->dirty)); - btrfs_free_extent(trans, root, buf->blocknr, 1, 1); + btrfs_set_node_blockptr(btrfs_buffer_node(parent), parent_slot, + cow->b_blocknr); + BUG_ON(!buffer_dirty(parent)); + btrfs_free_extent(trans, root, buf->b_blocknr, 1, 1); } btrfs_block_release(root, buf); return 0; @@ -119,12 +121,12 @@ static int check_node(struct btrfs_root *root, struct btrfs_path *path, { int i; struct btrfs_node *parent = NULL; - struct btrfs_node *node = &path->nodes[level]->node; + struct btrfs_node *node = btrfs_buffer_node(path->nodes[level]); int parent_slot; u32 nritems = btrfs_header_nritems(&node->header); if (path->nodes[level + 1]) - parent = &path->nodes[level + 1]->node; + parent = btrfs_buffer_node(path->nodes[level + 1]); parent_slot = path->slots[level + 1]; BUG_ON(nritems == 0); if (parent) { @@ -148,13 +150,13 @@ static int check_leaf(struct btrfs_root *root, struct btrfs_path *path, int level) { int i; - struct btrfs_leaf *leaf = &path->nodes[level]->leaf; + struct btrfs_leaf *leaf = btrfs_buffer_leaf(path->nodes[level]); struct btrfs_node *parent = NULL; int parent_slot; u32 nritems = btrfs_header_nritems(&leaf->header); if (path->nodes[level + 1]) - parent = &path->nodes[level + 1]->node; + parent = btrfs_buffer_node(path->nodes[level + 1]); parent_slot = path->slots[level + 1]; BUG_ON(btrfs_leaf_free_space(root, leaf) < 0); @@ -250,11 +252,11 @@ static int bin_search(struct btrfs_node *c, struct btrfs_key *key, int *slot) return -1; } -static struct btrfs_buffer *read_node_slot(struct btrfs_root *root, - struct btrfs_buffer *parent_buf, +static struct buffer_head *read_node_slot(struct btrfs_root *root, + struct buffer_head *parent_buf, int slot) { - struct btrfs_node *node = &parent_buf->node; + struct btrfs_node *node = btrfs_buffer_node(parent_buf); if (slot < 0) return NULL; if (slot >= btrfs_header_nritems(&node->header)) @@ -265,10 +267,10 @@ static struct btrfs_buffer *read_node_slot(struct btrfs_root *root, static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level) { - struct btrfs_buffer *right_buf; - struct btrfs_buffer *mid_buf; - struct btrfs_buffer *left_buf; - struct btrfs_buffer *parent_buf = NULL; + struct buffer_head *right_buf; + struct buffer_head *mid_buf; + struct buffer_head *left_buf; + struct buffer_head *parent_buf = NULL; struct btrfs_node *right = NULL; struct btrfs_node *mid; struct btrfs_node *left = NULL; @@ -283,7 +285,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root return 0; mid_buf = path->nodes[level]; - mid = &mid_buf->node; + mid = btrfs_buffer_node(mid_buf); orig_ptr = btrfs_node_blockptr(mid, orig_slot); if (level < BTRFS_MAX_LEVEL - 1) @@ -295,8 +297,8 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root * by promoting the node below to a root */ if (!parent_buf) { - struct btrfs_buffer *child; - u64 blocknr = mid_buf->blocknr; + struct buffer_head *child; + u64 blocknr = mid_buf->b_blocknr; if (btrfs_header_nritems(&mid->header) != 1) return 0; @@ -313,7 +315,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root clean_tree_block(trans, root, mid_buf); return btrfs_free_extent(trans, root, blocknr, 1, 1); } - parent = &parent_buf->node; + parent = btrfs_buffer_node(parent_buf); if (btrfs_header_nritems(&mid->header) > BTRFS_NODEPTRS_PER_BLOCK(root) / 4) @@ -326,7 +328,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root if (left_buf) { btrfs_cow_block(trans, root, left_buf, parent_buf, pslot - 1, &left_buf); - left = &left_buf->node; + left = btrfs_buffer_node(left_buf); orig_slot += btrfs_header_nritems(&left->header); wret = push_node_left(trans, root, left_buf, mid_buf); if (wret < 0) @@ -339,12 +341,12 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root if (right_buf) { btrfs_cow_block(trans, root, right_buf, parent_buf, pslot + 1, &right_buf); - right = &right_buf->node; + right = btrfs_buffer_node(right_buf); wret = push_node_left(trans, root, mid_buf, right_buf); if (wret < 0) ret = wret; if (btrfs_header_nritems(&right->header) == 0) { - u64 blocknr = right_buf->blocknr; + u64 blocknr = right_buf->b_blocknr; btrfs_block_release(root, right_buf); clean_tree_block(trans, root, right_buf); right_buf = NULL; @@ -360,7 +362,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root memcpy(&parent->ptrs[pslot + 1].key, &right->ptrs[0].key, sizeof(struct btrfs_disk_key)); - BUG_ON(list_empty(&parent_buf->dirty)); + BUG_ON(!buffer_dirty(parent_buf)); } } if (btrfs_header_nritems(&mid->header) == 1) { @@ -381,7 +383,7 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root } if (btrfs_header_nritems(&mid->header) == 0) { /* we've managed to empty the middle node, drop it */ - u64 blocknr = mid_buf->blocknr; + u64 blocknr = mid_buf->b_blocknr; btrfs_block_release(root, mid_buf); clean_tree_block(trans, root, mid_buf); mid_buf = NULL; @@ -396,13 +398,13 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root /* update the parent key to reflect our changes */ memcpy(&parent->ptrs[pslot].key, &mid->ptrs[0].key, sizeof(struct btrfs_disk_key)); - BUG_ON(list_empty(&parent_buf->dirty)); + BUG_ON(!buffer_dirty(parent_buf)); } /* update the path */ if (left_buf) { if (btrfs_header_nritems(&left->header) > orig_slot) { - left_buf->count++; // released below + get_bh(left_buf); path->nodes[level] = left_buf; path->slots[level + 1] -= 1; path->slots[level] = orig_slot; @@ -415,8 +417,9 @@ static int balance_level(struct btrfs_trans_handle *trans, struct btrfs_root } /* double check we haven't messed things up */ check_block(root, path, level); - if (orig_ptr != btrfs_node_blockptr(&path->nodes[level]->node, - path->slots[level])) + if (orig_ptr != + btrfs_node_blockptr(btrfs_buffer_node(path->nodes[level]), + path->slots[level])) BUG(); if (right_buf) @@ -443,8 +446,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_key *key, struct btrfs_path *p, int ins_len, int cow) { - struct btrfs_buffer *b; - struct btrfs_buffer *cow_buf; + struct buffer_head *b; + struct buffer_head *cow_buf; struct btrfs_node *c; int slot; int ret; @@ -452,18 +455,20 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root again: b = root->node; - b->count++; + get_bh(b); while (b) { - level = btrfs_header_level(&b->node.header); + c = btrfs_buffer_node(b); + level = btrfs_header_level(&c->header); if (cow) { int wret; - wret = btrfs_cow_block(trans, root, b, p->nodes[level + - 1], p->slots[level + 1], + wret = btrfs_cow_block(trans, root, b, + p->nodes[level + 1], + p->slots[level + 1], &cow_buf); b = cow_buf; } BUG_ON(!cow && ins_len); - c = &b->node; + c = btrfs_buffer_node(b); p->nodes[level] = b; ret = check_block(root, p, level); if (ret) @@ -480,7 +485,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root if (sret) return sret; b = p->nodes[level]; - c = &b->node; + c = btrfs_buffer_node(b); slot = p->slots[level]; } else if (ins_len < 0) { int sret = balance_level(trans, root, p, @@ -490,7 +495,7 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root b = p->nodes[level]; if (!b) goto again; - c = &b->node; + c = btrfs_buffer_node(b); slot = p->slots[level]; BUG_ON(btrfs_header_nritems(&c->header) == 1); } @@ -505,11 +510,9 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root if (sret) return sret; } - BUG_ON(root->node->count == 1); return ret; } } - BUG_ON(root->node->count == 1); return 1; } @@ -534,9 +537,9 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans, struct btrfs_root int tslot = path->slots[i]; if (!path->nodes[i]) break; - t = &path->nodes[i]->node; + t = btrfs_buffer_node(path->nodes[i]); memcpy(&t->ptrs[tslot].key, key, sizeof(*key)); - BUG_ON(list_empty(&path->nodes[i]->dirty)); + BUG_ON(!buffer_dirty(path->nodes[i])); if (tslot != 0) break; } @@ -551,11 +554,11 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans, struct btrfs_root * error, and > 0 if there was no room in the left hand block. */ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_buffer *dst_buf, struct - btrfs_buffer *src_buf) + *root, struct buffer_head *dst_buf, struct + buffer_head *src_buf) { - struct btrfs_node *src = &src_buf->node; - struct btrfs_node *dst = &dst_buf->node; + struct btrfs_node *src = btrfs_buffer_node(src_buf); + struct btrfs_node *dst = btrfs_buffer_node(dst_buf); int push_items = 0; int src_nritems; int dst_nritems; @@ -580,8 +583,8 @@ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root } btrfs_set_header_nritems(&src->header, src_nritems - push_items); btrfs_set_header_nritems(&dst->header, dst_nritems + push_items); - BUG_ON(list_empty(&src_buf->dirty)); - BUG_ON(list_empty(&dst_buf->dirty)); + BUG_ON(!buffer_dirty(src_buf)); + BUG_ON(!buffer_dirty(dst_buf)); return ret; } @@ -595,11 +598,11 @@ static int push_node_left(struct btrfs_trans_handle *trans, struct btrfs_root * this will only push up to 1/2 the contents of the left node over */ static int balance_node_right(struct btrfs_trans_handle *trans, struct - btrfs_root *root, struct btrfs_buffer *dst_buf, - struct btrfs_buffer *src_buf) + btrfs_root *root, struct buffer_head *dst_buf, + struct buffer_head *src_buf) { - struct btrfs_node *src = &src_buf->node; - struct btrfs_node *dst = &dst_buf->node; + struct btrfs_node *src = btrfs_buffer_node(src_buf); + struct btrfs_node *dst = btrfs_buffer_node(dst_buf); int push_items = 0; int max_push; int src_nritems; @@ -628,8 +631,8 @@ static int balance_node_right(struct btrfs_trans_handle *trans, struct btrfs_set_header_nritems(&src->header, src_nritems - push_items); btrfs_set_header_nritems(&dst->header, dst_nritems + push_items); - BUG_ON(list_empty(&src_buf->dirty)); - BUG_ON(list_empty(&dst_buf->dirty)); + BUG_ON(!buffer_dirty(src_buf)); + BUG_ON(!buffer_dirty(dst_buf)); return ret; } @@ -643,7 +646,7 @@ static int balance_node_right(struct btrfs_trans_handle *trans, struct static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level) { - struct btrfs_buffer *t; + struct buffer_head *t; struct btrfs_node *lower; struct btrfs_node *c; struct btrfs_disk_key *lower_key; @@ -652,24 +655,24 @@ static int insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root BUG_ON(path->nodes[level-1] != root->node); t = btrfs_alloc_free_block(trans, root); - c = &t->node; + c = btrfs_buffer_node(t); memset(c, 0, root->blocksize); btrfs_set_header_nritems(&c->header, 1); btrfs_set_header_level(&c->header, level); - btrfs_set_header_blocknr(&c->header, t->blocknr); + btrfs_set_header_blocknr(&c->header, t->b_blocknr); btrfs_set_header_parentid(&c->header, - btrfs_header_parentid(&root->node->node.header)); - lower = &path->nodes[level-1]->node; + btrfs_header_parentid(btrfs_buffer_header(root->node))); + lower = btrfs_buffer_node(path->nodes[level-1]); if (btrfs_is_leaf(lower)) lower_key = &((struct btrfs_leaf *)lower)->items[0].key; else lower_key = &lower->ptrs[0].key; memcpy(&c->ptrs[0].key, lower_key, sizeof(struct btrfs_disk_key)); - btrfs_set_node_blockptr(c, 0, path->nodes[level - 1]->blocknr); + btrfs_set_node_blockptr(c, 0, path->nodes[level - 1]->b_blocknr); /* the super has an extra ref to root->node */ btrfs_block_release(root, root->node); root->node = t; - t->count++; + get_bh(t); path->nodes[level] = t; path->slots[level] = 0; return 0; @@ -692,7 +695,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root int nritems; BUG_ON(!path->nodes[level]); - lower = &path->nodes[level]->node; + lower = btrfs_buffer_node(path->nodes[level]); nritems = btrfs_header_nritems(&lower->header); if (slot > nritems) BUG(); @@ -705,7 +708,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root memcpy(&lower->ptrs[slot].key, key, sizeof(struct btrfs_disk_key)); btrfs_set_node_blockptr(lower, slot, blocknr); btrfs_set_header_nritems(&lower->header, nritems + 1); - BUG_ON(list_empty(&path->nodes[level]->dirty)); + BUG_ON(!buffer_dirty(path->nodes[level])); return 0; } @@ -721,9 +724,9 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level) { - struct btrfs_buffer *t; + struct buffer_head *t; struct btrfs_node *c; - struct btrfs_buffer *split_buffer; + struct buffer_head *split_buffer; struct btrfs_node *split; int mid; int ret; @@ -731,7 +734,7 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root u32 c_nritems; t = path->nodes[level]; - c = &t->node; + c = btrfs_buffer_node(t); if (t == root->node) { /* trying to split the root, lets make a new one */ ret = insert_new_root(trans, root, path, level + 1); @@ -740,11 +743,11 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root } c_nritems = btrfs_header_nritems(&c->header); split_buffer = btrfs_alloc_free_block(trans, root); - split = &split_buffer->node; + split = btrfs_buffer_node(split_buffer); btrfs_set_header_flags(&split->header, btrfs_header_flags(&c->header)); - btrfs_set_header_blocknr(&split->header, split_buffer->blocknr); + btrfs_set_header_blocknr(&split->header, split_buffer->b_blocknr); btrfs_set_header_parentid(&split->header, - btrfs_header_parentid(&root->node->node.header)); + btrfs_header_parentid(btrfs_buffer_header(root->node))); mid = (c_nritems + 1) / 2; memcpy(split->ptrs, c->ptrs + mid, (c_nritems - mid) * sizeof(struct btrfs_key_ptr)); @@ -752,9 +755,9 @@ static int split_node(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_set_header_nritems(&c->header, mid); ret = 0; - BUG_ON(list_empty(&t->dirty)); + BUG_ON(!buffer_dirty(t)); wret = insert_ptr(trans, root, path, &split->ptrs[0].key, - split_buffer->blocknr, path->slots[level + 1] + 1, + split_buffer->b_blocknr, path->slots[level + 1] + 1, level + 1); if (wret) ret = wret; @@ -798,11 +801,12 @@ static int leaf_space_used(struct btrfs_leaf *l, int start, int nr) static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int data_size) { - struct btrfs_buffer *left_buf = path->nodes[0]; - struct btrfs_leaf *left = &left_buf->leaf; + struct buffer_head *left_buf = path->nodes[0]; + struct btrfs_leaf *left = btrfs_buffer_leaf(left_buf); struct btrfs_leaf *right; - struct btrfs_buffer *right_buf; - struct btrfs_buffer *upper; + struct buffer_head *right_buf; + struct buffer_head *upper; + struct btrfs_node *upper_node; int slot; int i; int free_space; @@ -817,12 +821,13 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root return 1; } upper = path->nodes[1]; - if (slot >= btrfs_header_nritems(&upper->node.header) - 1) { + upper_node = btrfs_buffer_node(upper); + if (slot >= btrfs_header_nritems(&upper_node->header) - 1) { return 1; } - right_buf = read_tree_block(root, btrfs_node_blockptr(&upper->node, - slot + 1)); - right = &right_buf->leaf; + right_buf = read_tree_block(root, + btrfs_node_blockptr(btrfs_buffer_node(upper), slot + 1)); + right = btrfs_buffer_leaf(right_buf); free_space = btrfs_leaf_free_space(root, right); if (free_space < data_size + sizeof(struct btrfs_item)) { btrfs_block_release(root, right_buf); @@ -830,7 +835,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root } /* cow and double check */ btrfs_cow_block(trans, root, right_buf, upper, slot + 1, &right_buf); - right = &right_buf->leaf; + right = btrfs_buffer_leaf(right_buf); free_space = btrfs_leaf_free_space(root, right); if (free_space < data_size + sizeof(struct btrfs_item)) { btrfs_block_release(root, right_buf); @@ -881,11 +886,11 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root left_nritems -= push_items; btrfs_set_header_nritems(&left->header, left_nritems); - BUG_ON(list_empty(&left_buf->dirty)); - BUG_ON(list_empty(&right_buf->dirty)); - memcpy(&upper->node.ptrs[slot + 1].key, + BUG_ON(!buffer_dirty(left_buf)); + BUG_ON(!buffer_dirty(right_buf)); + memcpy(&upper_node->ptrs[slot + 1].key, &right->items[0].key, sizeof(struct btrfs_disk_key)); - BUG_ON(list_empty(&upper->dirty)); + BUG_ON(!buffer_dirty(upper)); /* then fixup the leaf pointer in the path */ if (path->slots[0] >= left_nritems) { @@ -905,9 +910,9 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int data_size) { - struct btrfs_buffer *right_buf = path->nodes[0]; - struct btrfs_leaf *right = &right_buf->leaf; - struct btrfs_buffer *t; + struct buffer_head *right_buf = path->nodes[0]; + struct btrfs_leaf *right = btrfs_buffer_leaf(right_buf); + struct buffer_head *t; struct btrfs_leaf *left; int slot; int i; @@ -926,9 +931,9 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root if (!path->nodes[1]) { return 1; } - t = read_tree_block(root, btrfs_node_blockptr(&path->nodes[1]->node, - slot - 1)); - left = &t->leaf; + t = read_tree_block(root, + btrfs_node_blockptr(btrfs_buffer_node(path->nodes[1]), slot - 1)); + left = btrfs_buffer_leaf(t); free_space = btrfs_leaf_free_space(root, left); if (free_space < data_size + sizeof(struct btrfs_item)) { btrfs_block_release(root, t); @@ -937,7 +942,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root /* cow and double check */ btrfs_cow_block(trans, root, t, path->nodes[1], slot - 1, &t); - left = &t->leaf; + left = btrfs_buffer_leaf(t); free_space = btrfs_leaf_free_space(root, left); if (free_space < data_size + sizeof(struct btrfs_item)) { btrfs_block_release(root, t); @@ -999,8 +1004,8 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root push_space = btrfs_item_offset(right->items + i); } - BUG_ON(list_empty(&t->dirty)); - BUG_ON(list_empty(&right_buf->dirty)); + BUG_ON(!buffer_dirty(t)); + BUG_ON(!buffer_dirty(right_buf)); wret = fixup_low_keys(trans, root, path, &right->items[0].key, 1); if (wret) @@ -1029,13 +1034,13 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int data_size) { - struct btrfs_buffer *l_buf; + struct buffer_head *l_buf; struct btrfs_leaf *l; u32 nritems; int mid; int slot; struct btrfs_leaf *right; - struct btrfs_buffer *right_buffer; + struct buffer_head *right_buffer; int space_needed = data_size + sizeof(struct btrfs_item); int data_copy_size; int rt_data_off; @@ -1053,7 +1058,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root return wret; } l_buf = path->nodes[0]; - l = &l_buf->leaf; + l = btrfs_buffer_leaf(l_buf); /* did the pushes work? */ if (btrfs_leaf_free_space(root, l) >= @@ -1071,7 +1076,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root right_buffer = btrfs_alloc_free_block(trans, root); BUG_ON(!right_buffer); BUG_ON(mid == nritems); - right = &right_buffer->leaf; + right = btrfs_buffer_leaf(right_buffer); memset(&right->header, 0, sizeof(right->header)); if (mid <= slot) { /* FIXME, just alloc a new leaf here */ @@ -1085,10 +1090,10 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root BUG(); } btrfs_set_header_nritems(&right->header, nritems - mid); - btrfs_set_header_blocknr(&right->header, right_buffer->blocknr); + btrfs_set_header_blocknr(&right->header, right_buffer->b_blocknr); btrfs_set_header_level(&right->header, 0); btrfs_set_header_parentid(&right->header, - btrfs_header_parentid(&root->node->node.header)); + btrfs_header_parentid(btrfs_buffer_header(root->node))); data_copy_size = btrfs_item_end(l->items + mid) - leaf_data_end(root, l); memcpy(right->items, l->items + mid, @@ -1107,11 +1112,11 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_set_header_nritems(&l->header, mid); ret = 0; wret = insert_ptr(trans, root, path, &right->items[0].key, - right_buffer->blocknr, path->slots[1] + 1, 1); + right_buffer->b_blocknr, path->slots[1] + 1, 1); if (wret) ret = wret; - BUG_ON(list_empty(&right_buffer->dirty)); - BUG_ON(list_empty(&l_buf->dirty)); + BUG_ON(!buffer_dirty(right_buffer)); + BUG_ON(!buffer_dirty(l_buf)); BUG_ON(path->slots[0] != slot); if (mid <= slot) { btrfs_block_release(root, path->nodes[0]); @@ -1136,7 +1141,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root int slot; int slot_orig; struct btrfs_leaf *leaf; - struct btrfs_buffer *leaf_buf; + struct buffer_head *leaf_buf; u32 nritems; unsigned int data_end; struct btrfs_disk_key disk_key; @@ -1156,7 +1161,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root slot_orig = path->slots[0]; leaf_buf = path->nodes[0]; - leaf = &leaf_buf->leaf; + leaf = btrfs_buffer_leaf(leaf_buf); nritems = btrfs_header_nritems(&leaf->header); data_end = leaf_data_end(root, leaf); @@ -1202,7 +1207,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root if (slot == 0) ret = fixup_low_keys(trans, root, path, &disk_key, 1); - BUG_ON(list_empty(&leaf_buf->dirty)); + BUG_ON(!buffer_dirty(leaf_buf)); if (btrfs_leaf_free_space(root, leaf) < 0) BUG(); check_leaf(root, path, 0); @@ -1225,7 +1230,8 @@ int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_init_path(&path); ret = btrfs_insert_empty_item(trans, root, &path, cpu_key, data_size); if (!ret) { - ptr = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], u8); + ptr = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), + path.slots[0], u8); memcpy(ptr, data, data_size); } btrfs_release_path(root, &path); @@ -1243,12 +1249,12 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level, int slot) { struct btrfs_node *node; - struct btrfs_buffer *parent = path->nodes[level]; + struct buffer_head *parent = path->nodes[level]; u32 nritems; int ret = 0; int wret; - node = &parent->node; + node = btrfs_buffer_node(parent); nritems = btrfs_header_nritems(&node->header); if (slot != nritems -1) { memmove(node->ptrs + slot, node->ptrs + slot + 1, @@ -1257,16 +1263,17 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, nritems--; btrfs_set_header_nritems(&node->header, nritems); if (nritems == 0 && parent == root->node) { - BUG_ON(btrfs_header_level(&root->node->node.header) != 1); + struct btrfs_header *header = btrfs_buffer_header(root->node); + BUG_ON(btrfs_header_level(header) != 1); /* just turn the root into a leaf and break */ - btrfs_set_header_level(&root->node->node.header, 0); + btrfs_set_header_level(header, 0); } else if (slot == 0) { wret = fixup_low_keys(trans, root, path, &node->ptrs[0].key, level + 1); if (wret) ret = wret; } - BUG_ON(list_empty(&parent->dirty)); + BUG_ON(!buffer_dirty(parent)); return ret; } @@ -1279,7 +1286,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, { int slot; struct btrfs_leaf *leaf; - struct btrfs_buffer *leaf_buf; + struct buffer_head *leaf_buf; int doff; int dsize; int ret = 0; @@ -1287,7 +1294,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, u32 nritems; leaf_buf = path->nodes[0]; - leaf = &leaf_buf->leaf; + leaf = btrfs_buffer_leaf(leaf_buf); slot = path->slots[0]; doff = btrfs_item_offset(leaf->items + slot); dsize = btrfs_item_size(leaf->items + slot); @@ -1313,14 +1320,13 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, if (nritems == 0) { if (leaf_buf == root->node) { btrfs_set_header_level(&leaf->header, 0); - BUG_ON(list_empty(&leaf_buf->dirty)); } else { clean_tree_block(trans, root, leaf_buf); wret = del_ptr(trans, root, path, 1, path->slots[1]); if (wret) ret = wret; wret = btrfs_free_extent(trans, root, - leaf_buf->blocknr, 1, 1); + leaf_buf->b_blocknr, 1, 1); if (wret) ret = wret; } @@ -1332,7 +1338,6 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, if (wret) ret = wret; } - BUG_ON(list_empty(&leaf_buf->dirty)); /* delete the leaf if it is mostly empty */ if (used < BTRFS_LEAF_DATA_SIZE(root) / 3) { @@ -1341,7 +1346,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, * for possible call to del_ptr below */ slot = path->slots[1]; - leaf_buf->count++; + get_bh(leaf_buf); wret = push_leaf_left(trans, root, path, 1); if (wret < 0) ret = wret; @@ -1352,7 +1357,7 @@ int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, ret = wret; } if (btrfs_header_nritems(&leaf->header) == 0) { - u64 blocknr = leaf_buf->blocknr; + u64 blocknr = leaf_buf->b_blocknr; clean_tree_block(trans, root, leaf_buf); wret = del_ptr(trans, root, path, 1, slot); if (wret) @@ -1380,19 +1385,21 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path) int slot; int level = 1; u64 blocknr; - struct btrfs_buffer *c; - struct btrfs_buffer *next = NULL; + struct buffer_head *c; + struct btrfs_node *c_node; + struct buffer_head *next = NULL; while(level < BTRFS_MAX_LEVEL) { if (!path->nodes[level]) return 1; slot = path->slots[level] + 1; c = path->nodes[level]; - if (slot >= btrfs_header_nritems(&c->node.header)) { + c_node = btrfs_buffer_node(c); + if (slot >= btrfs_header_nritems(&c_node->header)) { level++; continue; } - blocknr = btrfs_node_blockptr(&c->node, slot); + blocknr = btrfs_node_blockptr(c_node, slot); if (next) btrfs_block_release(root, next); next = read_tree_block(root, blocknr); @@ -1408,7 +1415,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path) if (!level) break; next = read_tree_block(root, - btrfs_node_blockptr(&next->node, 0)); + btrfs_node_blockptr(btrfs_buffer_node(next), 0)); } return 0; } diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index ae8518cb94bf..7748eecd9304 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1,6 +1,9 @@ #ifndef __BTRFS__ #define __BTRFS__ +#include +#include + struct btrfs_trans_handle; #define BTRFS_MAGIC "_BtRfS_M" @@ -10,6 +13,12 @@ struct btrfs_trans_handle; #define BTRFS_INODE_MAP_OBJECTID 3 #define BTRFS_FS_TREE_OBJECTID 4 +/* + * we can actually store much bigger names, but lets not confuse the rest + * of linux + */ +#define BTRFS_NAME_LEN 255 + /* * the key defines the order in the tree, and so it also defines (optimal) * block layout. objectid corresonds to the inode number. The flags @@ -57,7 +66,7 @@ struct btrfs_header { #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize)) -struct btrfs_buffer; +struct buffer_head; /* * the super block basically lists the main trees of the FS * it currently lacks any block count etc etc @@ -120,7 +129,7 @@ struct btrfs_node { * used while walking the tree. */ struct btrfs_path { - struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL]; + struct buffer_head *nodes[BTRFS_MAX_LEVEL]; int slots[BTRFS_MAX_LEVEL]; }; @@ -211,17 +220,14 @@ struct btrfs_fs_info { struct btrfs_root *inode_root; struct btrfs_key current_insert; struct btrfs_key last_insert; - struct radix_tree_root cache_radix; struct radix_tree_root pinned_radix; - struct list_head trans; - struct list_head cache; u64 last_inode_alloc; u64 last_inode_alloc_dirid; u64 generation; - int cache_size; - int fp; struct btrfs_trans_handle *running_transaction; struct btrfs_super_block *disk_super; + struct buffer_head *sb_buffer; + struct super_block *sb; }; /* @@ -230,8 +236,8 @@ struct btrfs_fs_info { * only for the extent tree. */ struct btrfs_root { - struct btrfs_buffer *node; - struct btrfs_buffer *commit_root; + struct buffer_head *node; + struct buffer_head *commit_root; struct btrfs_root_item root_item; struct btrfs_key root_key; struct btrfs_fs_info *fs_info; @@ -389,6 +395,29 @@ static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i, i->compat_flags = cpu_to_le16(val); } +static inline u32 btrfs_timespec_sec(struct btrfs_inode_timespec *ts) +{ + return le32_to_cpu(ts->sec); +} + +static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts, + u32 val) +{ + ts->sec = cpu_to_le32(val); +} + +static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts) +{ + return le32_to_cpu(ts->nsec); +} + +static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts, + u32 val) +{ + ts->nsec = cpu_to_le32(val); +} + + static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei) { @@ -757,15 +786,20 @@ static inline void btrfs_set_file_extent_num_blocks(struct e->num_blocks = cpu_to_le64(val); } +static inline struct btrfs_root *btrfs_sb(struct super_block *sb) +{ + return sb->s_fs_info; +} + /* helper function to cast into the data area of the leaf. */ #define btrfs_item_ptr(leaf, slot, type) \ ((type *)(btrfs_leaf_data(leaf) + \ btrfs_item_offset((leaf)->items + (slot)))) -struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, +struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, struct btrfs_root *root); int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_buffer *buf); + struct buffer_head *buf); int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 blocknr, u64 num_blocks, int pin); int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root @@ -783,7 +817,7 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf); int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_buffer *snap); + *root, struct buffer_head *snap); int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct btrfs_root *root); int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, @@ -800,8 +834,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, char *name, int name_len, u64 dir, u64 objectid, u8 type); int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_path *path, u64 dir, char *name, - int name_len, int mod); + *root, struct btrfs_path *path, u64 dir, + const char *name, int name_len, int mod); int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path, char *name, int name_len); int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index 4d8083d92fa0..75d6e373e98d 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -18,12 +18,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root key.objectid = dir; key.flags = 0; btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); - if (name_len == 1 && *name == '.') - key.offset = 1; - else if (name_len == 2 && name[0] == '.' && name[1] == '.') - key.offset = 2; - else - ret = btrfs_name_hash(name, name_len, &key.offset); + ret = btrfs_name_hash(name, name_len, &key.offset); BUG_ON(ret); btrfs_init_path(&path); data_size = sizeof(*dir_item) + name_len; @@ -31,7 +26,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root if (ret) goto out; - dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], + dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), + path.slots[0], struct btrfs_dir_item); btrfs_set_dir_objectid(dir_item, objectid); btrfs_set_dir_type(dir_item, type); @@ -45,8 +41,8 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root } int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_path *path, u64 dir, char *name, - int name_len, int mod) + *root, struct btrfs_path *path, u64 dir, + const char *name, int name_len, int mod) { int ret; struct btrfs_key key; @@ -69,7 +65,8 @@ int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_dir_item *dir_item; char *name_ptr; - dir_item = btrfs_item_ptr(&path->nodes[0]->leaf, path->slots[0], + dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), + path->slots[0], struct btrfs_dir_item); if (btrfs_dir_name_len(dir_item) != name_len) return 0; diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 05637f9fd7c7..df2061a735cd 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1,165 +1,67 @@ -#define _XOPEN_SOURCE 500 -#include -#include -#include -#include -#include -#include -#include "kerncompat.h" -#include "radix-tree.h" +#include +#include #include "ctree.h" #include "disk-io.h" #include "transaction.h" -static int allocated_blocks = 0; -int cache_max = 10000; - -static int check_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf) +static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf) { - if (buf->blocknr != btrfs_header_blocknr(&buf->node.header)) + struct btrfs_node *node = btrfs_buffer_node(buf); + if (buf->b_blocknr != btrfs_header_blocknr(&node->header)) BUG(); - if (root->node && btrfs_header_parentid(&buf->node.header) != - btrfs_header_parentid(&root->node->node.header)) + if (root->node && btrfs_header_parentid(&node->header) != + btrfs_header_parentid(btrfs_buffer_header(root->node))) BUG(); return 0; } -static int free_some_buffers(struct btrfs_root *root) +struct buffer_head *alloc_tree_block(struct btrfs_root *root, u64 blocknr) { - struct list_head *node, *next; - struct btrfs_buffer *b; - if (root->fs_info->cache_size < cache_max) - return 0; - list_for_each_safe(node, next, &root->fs_info->cache) { - b = list_entry(node, struct btrfs_buffer, cache); - if (b->count == 1) { - BUG_ON(!list_empty(&b->dirty)); - list_del_init(&b->cache); - btrfs_block_release(root, b); - if (root->fs_info->cache_size < cache_max) - break; - } - } - return 0; + return sb_getblk(root->fs_info->sb, blocknr); } -struct btrfs_buffer *alloc_tree_block(struct btrfs_root *root, u64 blocknr) +struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr) { - struct btrfs_buffer *buf; - int ret; - - buf = malloc(sizeof(struct btrfs_buffer) + root->blocksize); - if (!buf) - return buf; - allocated_blocks++; - buf->blocknr = blocknr; - buf->count = 2; - INIT_LIST_HEAD(&buf->dirty); - free_some_buffers(root); - radix_tree_preload(GFP_KERNEL); - ret = radix_tree_insert(&root->fs_info->cache_radix, blocknr, buf); - radix_tree_preload_end(); - list_add_tail(&buf->cache, &root->fs_info->cache); - root->fs_info->cache_size++; - if (ret) { - free(buf); - return NULL; - } - return buf; + return sb_getblk(root->fs_info->sb, blocknr); } -struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr) +struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr) { - struct btrfs_buffer *buf; - buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr); - if (buf) { - buf->count++; - } else { - buf = alloc_tree_block(root, blocknr); - if (!buf) { - BUG(); - return NULL; - } - } - return buf; -} - -struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr) -{ - loff_t offset = blocknr * root->blocksize; - struct btrfs_buffer *buf; - int ret; + struct buffer_head *buf = sb_bread(root->fs_info->sb, blocknr); - buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr); - if (buf) { - buf->count++; - } else { - buf = alloc_tree_block(root, blocknr); - if (!buf) - return NULL; - ret = pread(root->fs_info->fp, &buf->node, root->blocksize, - offset); - if (ret != root->blocksize) { - free(buf); - return NULL; - } - } + if (!buf) + return buf; if (check_tree_block(root, buf)) BUG(); return buf; } int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_buffer *buf) + struct buffer_head *buf) { - if (!list_empty(&buf->dirty)) - return 0; - list_add_tail(&buf->dirty, &root->fs_info->trans); - buf->count++; + mark_buffer_dirty(buf); return 0; } int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_buffer *buf) + struct buffer_head *buf) { - if (!list_empty(&buf->dirty)) { - list_del_init(&buf->dirty); - btrfs_block_release(root, buf); - } + clear_buffer_dirty(buf); return 0; } int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_buffer *buf) + struct buffer_head *buf) { - u64 blocknr = buf->blocknr; - loff_t offset = blocknr * root->blocksize; - int ret; - - if (buf->blocknr != btrfs_header_blocknr(&buf->node.header)) - BUG(); - ret = pwrite(root->fs_info->fp, &buf->node, root->blocksize, offset); - if (ret != root->blocksize) - return ret; + mark_buffer_dirty(buf); return 0; } static int __commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root *root) { - struct btrfs_buffer *b; - int ret = 0; - int wret; - while(!list_empty(&root->fs_info->trans)) { - b = list_entry(root->fs_info->trans.next, struct btrfs_buffer, - dirty); - list_del_init(&b->dirty); - wret = write_tree_block(trans, root, b); - if (wret) - ret = wret; - btrfs_block_release(root, b); - } - return ret; + filemap_write_and_wait(root->fs_info->sb->s_bdev->bd_inode->i_mapping); + return 0; } static int commit_tree_roots(struct btrfs_trans_handle *trans, @@ -172,17 +74,17 @@ static int commit_tree_roots(struct btrfs_trans_handle *trans, struct btrfs_root *inode_root = fs_info->inode_root; btrfs_set_root_blocknr(&inode_root->root_item, - inode_root->node->blocknr); + inode_root->node->b_blocknr); ret = btrfs_update_root(trans, tree_root, &inode_root->root_key, &inode_root->root_item); BUG_ON(ret); while(1) { old_extent_block = btrfs_root_blocknr(&extent_root->root_item); - if (old_extent_block == extent_root->node->blocknr) + if (old_extent_block == extent_root->node->b_blocknr) break; btrfs_set_root_blocknr(&extent_root->root_item, - extent_root->node->blocknr); + extent_root->node->b_blocknr); ret = btrfs_update_root(trans, tree_root, &extent_root->root_key, &extent_root->root_item); @@ -195,7 +97,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_super_block *s) { int ret = 0; - struct btrfs_buffer *snap = root->commit_root; + struct buffer_head *snap = root->commit_root; struct btrfs_key snap_key; if (root->commit_root == root->node) @@ -204,7 +106,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct memcpy(&snap_key, &root->root_key, sizeof(snap_key)); root->root_key.offset++; - btrfs_set_root_blocknr(&root->root_item, root->node->blocknr); + btrfs_set_root_blocknr(&root->root_item, root->node->b_blocknr); ret = btrfs_insert_root(trans, root->fs_info->tree_root, &root->root_key, &root->root_item); BUG_ON(ret); @@ -220,7 +122,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_finish_extent_commit(trans, root->fs_info->tree_root); root->commit_root = root->node; - root->node->count++; + get_bh(root->node); ret = btrfs_drop_snapshot(trans, root, snap); BUG_ON(ret); @@ -234,7 +136,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct static int __setup_root(struct btrfs_super_block *super, struct btrfs_root *root, struct btrfs_fs_info *fs_info, - u64 objectid, int fp) + u64 objectid) { root->node = NULL; root->commit_root = NULL; @@ -250,11 +152,11 @@ static int find_and_setup_root(struct btrfs_super_block *super, struct btrfs_root *tree_root, struct btrfs_fs_info *fs_info, u64 objectid, - struct btrfs_root *root, int fp) + struct btrfs_root *root) { int ret; - __setup_root(super, root, fs_info, objectid, fp); + __setup_root(super, root, fs_info, objectid); ret = btrfs_find_last_root(tree_root, objectid, &root->root_item, &root->root_key); BUG_ON(ret); @@ -265,32 +167,26 @@ static int find_and_setup_root(struct btrfs_super_block *super, return 0; } -struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *super) +struct btrfs_root *open_ctree(struct super_block *sb, + struct buffer_head *sb_buffer, + struct btrfs_super_block *disk_super) { - int fp; - - fp = open(filename, O_CREAT | O_RDWR, 0600); - if (fp < 0) { - return NULL; - } - return open_ctree_fd(fp, super); -} - -struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super) -{ - struct btrfs_root *root = malloc(sizeof(struct btrfs_root)); - struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root)); - struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root)); - struct btrfs_root *inode_root = malloc(sizeof(struct btrfs_root)); - struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info)); + struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root), + GFP_NOFS); + struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root), + GFP_NOFS); + struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root), + GFP_NOFS); + struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root), + GFP_NOFS); + struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info), + GFP_NOFS); int ret; - INIT_RADIX_TREE(&fs_info->cache_radix, GFP_KERNEL); + /* FIXME: don't be stupid */ + if (!btrfs_super_root(disk_super)) + return NULL; INIT_RADIX_TREE(&fs_info->pinned_radix, GFP_KERNEL); - INIT_LIST_HEAD(&fs_info->trans); - INIT_LIST_HEAD(&fs_info->cache); - fs_info->cache_size = 0; - fs_info->fp = fp; fs_info->running_transaction = NULL; fs_info->fs_root = root; fs_info->tree_root = tree_root; @@ -298,36 +194,31 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super) fs_info->inode_root = inode_root; fs_info->last_inode_alloc = 0; fs_info->last_inode_alloc_dirid = 0; - fs_info->disk_super = super; + fs_info->disk_super = disk_super; + fs_info->sb_buffer = sb_buffer; + fs_info->sb = sb; memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert)); memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert)); - ret = pread(fp, super, sizeof(struct btrfs_super_block), - BTRFS_SUPER_INFO_OFFSET); - if (ret == 0 || btrfs_super_root(super) == 0) { - BUG(); - return NULL; - } - BUG_ON(ret < 0); - - __setup_root(super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID, fp); - tree_root->node = read_tree_block(tree_root, btrfs_super_root(super)); + __setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID); + tree_root->node = read_tree_block(tree_root, + btrfs_super_root(disk_super)); BUG_ON(!tree_root->node); - ret = find_and_setup_root(super, tree_root, fs_info, - BTRFS_EXTENT_TREE_OBJECTID, extent_root, fp); + ret = find_and_setup_root(disk_super, tree_root, fs_info, + BTRFS_EXTENT_TREE_OBJECTID, extent_root); BUG_ON(ret); - ret = find_and_setup_root(super, tree_root, fs_info, - BTRFS_INODE_MAP_OBJECTID, inode_root, fp); + ret = find_and_setup_root(disk_super, tree_root, fs_info, + BTRFS_INODE_MAP_OBJECTID, inode_root); BUG_ON(ret); - ret = find_and_setup_root(super, tree_root, fs_info, - BTRFS_FS_TREE_OBJECTID, root, fp); + ret = find_and_setup_root(disk_super, tree_root, fs_info, + BTRFS_FS_TREE_OBJECTID, root); BUG_ON(ret); root->commit_root = root->node; - root->node->count++; + get_bh(root->node); root->ref_cows = 1; root->fs_info->generation = root->root_key.offset + 1; return root; @@ -336,8 +227,11 @@ struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super) int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_super_block *s) { + return 0; +#if 0 int ret; - btrfs_set_super_root(s, root->fs_info->tree_root->node->blocknr); + btrfs_set_super_root(s, root->fs_info->tree_root->node->b_blocknr); + ret = pwrite(root->fs_info->fp, s, sizeof(*s), BTRFS_SUPER_INFO_OFFSET); if (ret != sizeof(*s)) { @@ -345,35 +239,38 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root return ret; } return 0; +#endif } static int drop_cache(struct btrfs_root *root) { + return 0; +#if 0 while(!list_empty(&root->fs_info->cache)) { - struct btrfs_buffer *b = list_entry(root->fs_info->cache.next, - struct btrfs_buffer, + struct buffer_head *b = list_entry(root->fs_info->cache.next, + struct buffer_head, cache); list_del_init(&b->cache); btrfs_block_release(root, b); } return 0; +#endif } -int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s) + +int close_ctree(struct btrfs_root *root) { int ret; struct btrfs_trans_handle *trans; trans = root->fs_info->running_transaction; - btrfs_commit_transaction(trans, root, s); + btrfs_commit_transaction(trans, root, root->fs_info->disk_super); ret = commit_tree_roots(trans, root->fs_info); BUG_ON(ret); ret = __commit_transaction(trans, root); BUG_ON(ret); - write_ctree_super(trans, root, s); + write_ctree_super(trans, root, root->fs_info->disk_super); drop_cache(root); - BUG_ON(!list_empty(&root->fs_info->trans)); - close(root->fs_info->fp); if (root->node) btrfs_block_release(root, root->node); if (root->fs_info->extent_root->node) @@ -386,29 +283,17 @@ int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s) btrfs_block_release(root->fs_info->tree_root, root->fs_info->tree_root->node); btrfs_block_release(root, root->commit_root); - free(root); - printf("on close %d blocks are allocated\n", allocated_blocks); + btrfs_block_release(root, root->fs_info->sb_buffer); + kfree(root->fs_info->extent_root); + kfree(root->fs_info->inode_root); + kfree(root->fs_info->tree_root); + kfree(root->fs_info); + kfree(root); return 0; } -void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf) +void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf) { - buf->count--; - if (buf->count < 0) - BUG(); - if (buf->count == 0) { - BUG_ON(!list_empty(&buf->cache)); - BUG_ON(!list_empty(&buf->dirty)); - if (!radix_tree_lookup(&root->fs_info->cache_radix, - buf->blocknr)) - BUG(); - radix_tree_delete(&root->fs_info->cache_radix, buf->blocknr); - memset(buf, 0, sizeof(*buf)); - free(buf); - BUG_ON(allocated_blocks == 0); - allocated_blocks--; - BUG_ON(root->fs_info->cache_size == 0); - root->fs_info->cache_size--; - } + brelse(buf); } diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index d888cf5c350b..7f4bb729b734 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -1,36 +1,41 @@ #ifndef __DISKIO__ #define __DISKIO__ -#include "list.h" -struct btrfs_buffer { - u64 blocknr; - int count; - struct list_head dirty; - struct list_head cache; - union { - struct btrfs_node node; - struct btrfs_leaf leaf; - }; -}; +#include -struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr); -struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr); +#define BTRFS_SUPER_INFO_OFFSET (16 * 1024) + +static inline struct btrfs_node *btrfs_buffer_node(struct buffer_head *bh) +{ + return (struct btrfs_node *)bh->b_data; +} + +static inline struct btrfs_leaf *btrfs_buffer_leaf(struct buffer_head *bh) +{ + return (struct btrfs_leaf *)bh->b_data; +} + +static inline struct btrfs_header *btrfs_buffer_header(struct buffer_head *bh) +{ + return &((struct btrfs_node *)bh->b_data)->header; +} + +struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr); +struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr); int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_buffer *buf); + struct buffer_head *buf); int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_buffer *buf); + struct buffer_head *buf); int clean_tree_block(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_buffer *buf); + struct btrfs_root *root, struct buffer_head *buf); int btrfs_commit_transaction(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_super_block *s); -struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *s); -struct btrfs_root *open_ctree_fd(int fp, struct btrfs_super_block *super); -int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s); -void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf); +struct btrfs_root *open_ctree(struct super_block *sb, + struct buffer_head *sb_buffer, + struct btrfs_super_block *disk_super); +int close_ctree(struct btrfs_root *root); +void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf); int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_super_block *s); int mkfs(int fd, u64 num_blocks, u32 blocksize); - -#define BTRFS_SUPER_INFO_OFFSET (16 * 1024) - #endif diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 53a7550b5c1e..e3af2c035687 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -10,9 +10,8 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root search_end, struct btrfs_key *ins); static int finish_current_insert(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root); -static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root - *extent_root); - +static int del_pending_extents(struct btrfs_trans_handle *trans, struct + btrfs_root *extent_root); /* * pending extents are blocks that we're trying to allocate in the extent * map while trying to grow the map because of other allocations. To avoid @@ -21,6 +20,7 @@ static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root * manner for deletes. */ #define CTREE_EXTENT_PENDING_DEL 0 +#define CTREE_EXTENT_PINNED 1 static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 blocknr) @@ -45,15 +45,14 @@ static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root if (ret != 0) BUG(); BUG_ON(ret != 0); - l = &path.nodes[0]->leaf; + l = btrfs_buffer_leaf(path.nodes[0]); item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item); refs = btrfs_extent_refs(item); btrfs_set_extent_refs(item, refs + 1); - BUG_ON(list_empty(&path.nodes[0]->dirty)); btrfs_release_path(root->fs_info->extent_root, &path); finish_current_insert(trans, root->fs_info->extent_root); - run_pending(trans, root->fs_info->extent_root); + del_pending_extents(trans, root->fs_info->extent_root); return 0; } @@ -74,7 +73,7 @@ static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root 0, 0); if (ret != 0) BUG(); - l = &path.nodes[0]->leaf; + l = btrfs_buffer_leaf(path.nodes[0]); item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item); *refs = btrfs_extent_refs(item); btrfs_release_path(root->fs_info->extent_root, &path); @@ -82,18 +81,20 @@ static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root } int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_buffer *buf) + struct buffer_head *buf) { u64 blocknr; + struct btrfs_node *buf_node; int i; if (!root->ref_cows) return 0; - if (btrfs_is_leaf(&buf->node)) + buf_node = btrfs_buffer_node(buf); + if (btrfs_is_leaf(buf_node)) return 0; - for (i = 0; i < btrfs_header_nritems(&buf->node.header); i++) { - blocknr = btrfs_node_blockptr(&buf->node, i); + for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) { + blocknr = btrfs_node_blockptr(buf_node, i); inc_block_ref(trans, root, blocknr); } return 0; @@ -108,9 +109,10 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct int i; while(1) { - ret = radix_tree_gang_lookup(&root->fs_info->pinned_radix, + ret = radix_tree_gang_lookup_tag(&root->fs_info->pinned_radix, (void **)gang, 0, - ARRAY_SIZE(gang)); + ARRAY_SIZE(gang), + CTREE_EXTENT_PINNED); if (!ret) break; if (!first) @@ -137,7 +139,7 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct btrfs_set_extent_refs(&extent_item, 1); btrfs_set_extent_owner(&extent_item, - btrfs_header_parentid(&extent_root->node->node.header)); + btrfs_header_parentid(btrfs_buffer_header(extent_root->node))); ins.offset = 1; ins.flags = 0; btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); @@ -156,11 +158,24 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct return 0; } +static int pin_down_block(struct btrfs_root *root, u64 blocknr, int tag) +{ + int err; + err = radix_tree_insert(&root->fs_info->pinned_radix, + blocknr, (void *)blocknr); + BUG_ON(err); + if (err) + return err; + radix_tree_tag_set(&root->fs_info->pinned_radix, blocknr, + tag); + return 0; +} + /* * remove an extent from the root, returns 0 on success */ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root - *root, u64 blocknr, u64 num_blocks, int pin) + *root, u64 blocknr, u64 num_blocks) { struct btrfs_path path; struct btrfs_key key; @@ -171,7 +186,6 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root struct btrfs_key ins; u32 refs; - BUG_ON(pin && num_blocks != 1); key.objectid = blocknr; key.flags = 0; btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); @@ -186,26 +200,18 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root printk("failed to find %Lu\n", key.objectid); BUG(); } - ei = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], + ei = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], struct btrfs_extent_item); BUG_ON(ei->refs == 0); refs = btrfs_extent_refs(ei) - 1; btrfs_set_extent_refs(ei, refs); if (refs == 0) { u64 super_blocks_used; - if (pin) { - int err; - radix_tree_preload(GFP_KERNEL); - err = radix_tree_insert(&info->pinned_radix, - blocknr, (void *)blocknr); - BUG_ON(err); - radix_tree_preload_end(); - } super_blocks_used = btrfs_super_blocks_used(info->disk_super); btrfs_set_super_blocks_used(info->disk_super, super_blocks_used - num_blocks); ret = btrfs_del_item(trans, extent_root, &path); - if (!pin && extent_root->fs_info->last_insert.objectid > + if (extent_root->fs_info->last_insert.objectid > blocknr) extent_root->fs_info->last_insert.objectid = blocknr; if (ret) @@ -224,39 +230,32 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root) { int ret; - struct btrfs_buffer *gang[4]; + int wret; + int err = 0; + unsigned long gang[4]; int i; + struct radix_tree_root *radix = &extent_root->fs_info->pinned_radix; while(1) { ret = radix_tree_gang_lookup_tag( - &extent_root->fs_info->cache_radix, + &extent_root->fs_info->pinned_radix, (void **)gang, 0, ARRAY_SIZE(gang), CTREE_EXTENT_PENDING_DEL); if (!ret) break; for (i = 0; i < ret; i++) { - ret = __free_extent(trans, extent_root, - gang[i]->blocknr, 1, 1); - radix_tree_tag_clear(&extent_root->fs_info->cache_radix, - gang[i]->blocknr, + radix_tree_tag_set(radix, gang[i], CTREE_EXTENT_PINNED); + radix_tree_tag_clear(radix, gang[i], CTREE_EXTENT_PENDING_DEL); - btrfs_block_release(extent_root, gang[i]); + wret = __free_extent(trans, extent_root, gang[i], 1); + if (wret) + err = wret; } } - return 0; + return err; } -static int run_pending(struct btrfs_trans_handle *trans, struct btrfs_root - *extent_root) -{ - while(radix_tree_tagged(&extent_root->fs_info->cache_radix, - CTREE_EXTENT_PENDING_DEL)) - del_pending_extents(trans, extent_root); - return 0; -} - - /* * remove an extent from the root, returns 0 on success */ @@ -264,18 +263,21 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 blocknr, u64 num_blocks, int pin) { struct btrfs_root *extent_root = root->fs_info->extent_root; - struct btrfs_buffer *t; + struct buffer_head *t; int pending_ret; int ret; if (root == extent_root) { t = find_tree_block(root, blocknr); - radix_tree_tag_set(&root->fs_info->cache_radix, blocknr, - CTREE_EXTENT_PENDING_DEL); + pin_down_block(root, blocknr, CTREE_EXTENT_PENDING_DEL); return 0; } - ret = __free_extent(trans, root, blocknr, num_blocks, pin); - pending_ret = run_pending(trans, root->fs_info->extent_root); + if (pin) { + ret = pin_down_block(root, blocknr, CTREE_EXTENT_PINNED); + BUG_ON(ret); + } + ret = __free_extent(trans, root, blocknr, num_blocks); + pending_ret = del_pending_extents(trans, root->fs_info->extent_root); return ret ? ret : pending_ret; } @@ -296,14 +298,16 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root int ret; u64 hole_size = 0; int slot = 0; - u64 last_block; + u64 last_block = 0; u64 test_block; int start_found; struct btrfs_leaf *l; struct btrfs_root * root = orig_root->fs_info->extent_root; int total_needed = num_blocks; + int level; - total_needed += (btrfs_header_level(&root->node->node.header) + 1) * 3; + level = btrfs_header_level(btrfs_buffer_header(root->node)); + total_needed += (level + 1) * 3; if (root->fs_info->last_insert.objectid > search_start) search_start = root->fs_info->last_insert.objectid; @@ -323,7 +327,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root path.slots[0]--; while (1) { - l = &path.nodes[0]->leaf; + l = btrfs_buffer_leaf(path.nodes[0]); slot = path.slots[0]; if (slot >= btrfs_header_nritems(&l->header)) { ret = btrfs_next_leaf(root, &path); @@ -429,7 +433,7 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root sizeof(extent_item)); finish_current_insert(trans, extent_root); - pending_ret = run_pending(trans, extent_root); + pending_ret = del_pending_extents(trans, extent_root); if (ret) return ret; if (pending_ret) @@ -441,16 +445,15 @@ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root * helper function to allocate a block for a given tree * returns the tree buffer or NULL. */ -struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, +struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, struct btrfs_root *root) { struct btrfs_key ins; int ret; - struct btrfs_buffer *buf; + struct buffer_head *buf; ret = alloc_extent(trans, root, 1, 0, (unsigned long)-1, - btrfs_header_parentid(&root->node->node.header), - &ins); + btrfs_header_parentid(btrfs_buffer_header(root->node)), &ins); if (ret) { BUG(); return NULL; @@ -467,13 +470,13 @@ struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int *level) { - struct btrfs_buffer *next; - struct btrfs_buffer *cur; + struct buffer_head *next; + struct buffer_head *cur; u64 blocknr; int ret; u32 refs; - ret = lookup_block_ref(trans, root, path->nodes[*level]->blocknr, + ret = lookup_block_ref(trans, root, path->nodes[*level]->b_blocknr, &refs); BUG_ON(ret); if (refs > 1) @@ -484,9 +487,10 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root while(*level > 0) { cur = path->nodes[*level]; if (path->slots[*level] >= - btrfs_header_nritems(&cur->node.header)) + btrfs_header_nritems(btrfs_buffer_header(cur))) break; - blocknr = btrfs_node_blockptr(&cur->node, path->slots[*level]); + blocknr = btrfs_node_blockptr(btrfs_buffer_node(cur), + path->slots[*level]); ret = lookup_block_ref(trans, root, blocknr, &refs); if (refs != 1 || *level == 1) { path->slots[*level]++; @@ -499,12 +503,12 @@ static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root if (path->nodes[*level-1]) btrfs_block_release(root, path->nodes[*level-1]); path->nodes[*level-1] = next; - *level = btrfs_header_level(&next->node.header); + *level = btrfs_header_level(btrfs_buffer_header(next)); path->slots[*level] = 0; } out: - ret = btrfs_free_extent(trans, root, path->nodes[*level]->blocknr, 1, - 1); + ret = btrfs_free_extent(trans, root, path->nodes[*level]->b_blocknr, + 1, 1); btrfs_block_release(root, path->nodes[*level]); path->nodes[*level] = NULL; *level += 1; @@ -525,14 +529,14 @@ static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root int ret; for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { slot = path->slots[i]; - if (slot < - btrfs_header_nritems(&path->nodes[i]->node.header)- 1) { + if (slot < btrfs_header_nritems( + btrfs_buffer_header(path->nodes[i])) - 1) { path->slots[i]++; *level = i; return 0; } else { ret = btrfs_free_extent(trans, root, - path->nodes[*level]->blocknr, + path->nodes[*level]->b_blocknr, 1, 1); btrfs_block_release(root, path->nodes[*level]); path->nodes[*level] = NULL; @@ -549,7 +553,7 @@ static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root * decremented. */ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_buffer *snap) + *root, struct buffer_head *snap) { int ret = 0; int wret; @@ -560,7 +564,7 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_init_path(&path); - level = btrfs_header_level(&snap->node.header); + level = btrfs_header_level(btrfs_buffer_header(snap)); orig_level = level; path.nodes[level] = snap; path.slots[level] = 0; diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c index 6c2a71a46c7d..22519b8e0cf2 100644 --- a/fs/btrfs/hash.c +++ b/fs/btrfs/hash.c @@ -10,6 +10,7 @@ * License. */ +#include #define DELTA 0x9E3779B9 static void TEA_transform(__u32 buf[2], __u32 const in[]) @@ -63,6 +64,14 @@ int btrfs_name_hash(const char *name, int len, u64 *hash_result) const char *p; __u32 in[8], buf[2]; + if (len == 1 && *name == '.') { + *hash_result = 1; + return 0; + } else if (len == 2 && name[0] == '.' && name[1] == '.') { + *hash_result = 2; + return 0; + } + /* Initialize the default seed for the hash checksum functions */ buf[0] = 0x67452301; buf[1] = 0xefcdab89; diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c index c7fda3bf7b21..c45aec258bd5 100644 --- a/fs/btrfs/inode-map.c +++ b/fs/btrfs/inode-map.c @@ -15,7 +15,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, int ret; u64 hole_size = 0; int slot = 0; - u64 last_ino; + u64 last_ino = 0; int start_found; struct btrfs_leaf *l; struct btrfs_root *root = fs_root->fs_info->inode_root; @@ -40,7 +40,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, path.slots[0]--; while (1) { - l = &path.nodes[0]->leaf; + l = btrfs_buffer_leaf(path.nodes[0]); slot = path.slots[0]; if (slot >= btrfs_header_nritems(&l->header)) { ret = btrfs_next_leaf(root, &path); @@ -105,8 +105,8 @@ int btrfs_insert_inode_map(struct btrfs_trans_handle *trans, if (ret) goto out; - inode_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], - struct btrfs_inode_map_item); + inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), + path.slots[0], struct btrfs_inode_map_item); btrfs_cpu_key_to_disk(&inode_item->key, location); out: btrfs_release_path(inode_root, &path); diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c index aa2d3fac8804..c8ee938c1251 100644 --- a/fs/btrfs/print-tree.c +++ b/fs/btrfs/print-tree.c @@ -17,7 +17,6 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l) printk("leaf %Lu total ptrs %d free space %d\n", btrfs_header_blocknr(&l->header), nr, btrfs_leaf_free_space(root, l)); - fflush(stdout); for (i = 0 ; i < nr ; i++) { item = l->items + i; type = btrfs_disk_key_type(&item->key); @@ -67,10 +66,10 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l) btrfs_leaf_data(l) + btrfs_item_offset(item)); break; }; - fflush(stdout); } } -void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t) + +void btrfs_print_tree(struct btrfs_root *root, struct buffer_head *t) { int i; u32 nr; @@ -78,16 +77,16 @@ void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t) if (!t) return; - c = &t->node; + c = btrfs_buffer_node(t); nr = btrfs_header_nritems(&c->header); if (btrfs_is_leaf(c)) { btrfs_print_leaf(root, (struct btrfs_leaf *)c); return; } - printk("node %Lu level %d total ptrs %d free spc %u\n", t->blocknr, - btrfs_header_level(&c->header), nr, - (u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr); - fflush(stdout); + printk("node %Lu level %d total ptrs %d free spc %u\n", + btrfs_header_blocknr(&c->header), + btrfs_header_level(&c->header), nr, + (u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr); for (i = 0; i < nr; i++) { printk("\tkey %d (%Lu %u %Lu) block %Lu\n", i, @@ -95,12 +94,11 @@ void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t) c->ptrs[i].key.flags, c->ptrs[i].key.offset, btrfs_node_blockptr(c, i)); - fflush(stdout); } for (i = 0; i < nr; i++) { - struct btrfs_buffer *next_buf = read_tree_block(root, + struct buffer_head *next_buf = read_tree_block(root, btrfs_node_blockptr(c, i)); - struct btrfs_node *next = &next_buf->node; + struct btrfs_node *next = btrfs_buffer_node(next_buf); if (btrfs_is_leaf(next) && btrfs_header_level(&c->header) != 1) BUG(); diff --git a/fs/btrfs/print-tree.h b/fs/btrfs/print-tree.h index 0882ca904eca..396041a05cfa 100644 --- a/fs/btrfs/print-tree.h +++ b/fs/btrfs/print-tree.h @@ -1,5 +1,5 @@ #ifndef __PRINT_TREE_ #define __PRINT_TREE_ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l); -void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t); +void btrfs_print_tree(struct btrfs_root *root, struct buffer_head *t); #endif diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 52c83be4b307..a4554c007ef7 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -21,7 +21,7 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, if (ret < 0) goto out; BUG_ON(ret == 0); - l = &path.nodes[0]->leaf; + l = btrfs_buffer_leaf(path.nodes[0]); BUG_ON(path.slots[0] == 0); slot = path.slots[0] - 1; if (btrfs_disk_key_objectid(&l->items[slot].key) != objectid) { @@ -51,7 +51,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root if (ret < 0) goto out; BUG_ON(ret != 0); - l = &path.nodes[0]->leaf; + l = btrfs_buffer_leaf(path.nodes[0]); slot = path.slots[0]; memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item, sizeof(*item)); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 4ae76044aeab..ccc056aad692 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1,4 +1,5 @@ #include +#include #include #include #include @@ -8,13 +9,18 @@ #include #include #include "ctree.h" +#include "disk-io.h" #define BTRFS_SUPER_MAGIC 0x9123682E + +static struct inode_operations btrfs_dir_inode_operations; +static struct super_operations btrfs_super_ops; +static struct file_operations btrfs_dir_file_operations; + #if 0 /* some random number */ static struct super_operations ramfs_ops; -static struct inode_operations ramfs_dir_inode_operations; static struct backing_dev_info ramfs_backing_dev_info = { .ra_pages = 0, /* No readahead */ @@ -129,46 +135,243 @@ static struct inode_operations ramfs_dir_inode_operations = { }; #endif -struct inode *btrfs_get_inode(struct super_block *sb, int mode, dev_t dev) +static void btrfs_read_locked_inode(struct inode *inode) { - struct inode * inode = new_inode(sb); + struct btrfs_path path; + struct btrfs_inode_item *inode_item; + struct btrfs_root *root = btrfs_sb(inode->i_sb); + int ret; +printk("read locked inode %lu\n", inode->i_ino); + btrfs_init_path(&path); + ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0); + if (ret) { + make_bad_inode(inode); + return; + } + inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), + path.slots[0], + struct btrfs_inode_item); - if (inode) { - inode->i_mode = mode; - inode->i_uid = current->fsuid; - inode->i_gid = current->fsgid; - inode->i_blocks = 0; - inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; +printk("found locked inode %lu\n", inode->i_ino); + inode->i_mode = btrfs_inode_mode(inode_item); + inode->i_nlink = btrfs_inode_nlink(inode_item); + inode->i_uid = btrfs_inode_uid(inode_item); + inode->i_gid = btrfs_inode_gid(inode_item); + inode->i_size = btrfs_inode_size(inode_item); + inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); + inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); + inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); + inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); + inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); + inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); + inode->i_blocks = btrfs_inode_nblocks(inode_item); + inode->i_generation = btrfs_inode_generation(inode_item); +printk("about to release\n"); + btrfs_release_path(root, &path); + switch (inode->i_mode & S_IFMT) { +#if 0 + default: + init_special_inode(inode, inode->i_mode, + btrfs_inode_rdev(inode_item)); + break; +#endif + case S_IFREG: +printk("inode %lu now a file\n", inode->i_ino); + break; + case S_IFDIR: +printk("inode %lu now a directory\n", inode->i_ino); + inode->i_op = &btrfs_dir_inode_operations; + inode->i_fop = &btrfs_dir_file_operations; + break; + case S_IFLNK: +printk("inode %lu now a link\n", inode->i_ino); + // inode->i_op = &page_symlink_inode_operations; + break; } - return inode; +printk("returning!\n"); + return; } -static struct super_operations btrfs_ops = { - .statfs = simple_statfs, - .drop_inode = generic_delete_inode, -}; +static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, + ino_t *ino) +{ + const char *name = dentry->d_name.name; + int namelen = dentry->d_name.len; + struct btrfs_dir_item *di; + struct btrfs_path path; + struct btrfs_root *root = btrfs_sb(dir->i_sb); + int ret; + + btrfs_init_path(&path); + ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name, + namelen, 0); + if (ret) { + *ino = 0; + goto out; + } + di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], + struct btrfs_dir_item); + *ino = btrfs_dir_objectid(di); +out: + btrfs_release_path(root, &path); + return ret; +} + +static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +{ + struct inode * inode; + ino_t ino; + int ret; + + if (dentry->d_name.len > BTRFS_NAME_LEN) + return ERR_PTR(-ENAMETOOLONG); + + ret = btrfs_inode_by_name(dir, dentry, &ino); + if (ret < 0) + return ERR_PTR(ret); + inode = NULL; + if (ino) { +printk("lookup on %.*s returns %lu\n", dentry->d_name.len, dentry->d_name.name, ino); + inode = iget(dir->i_sb, ino); + if (!inode) + return ERR_PTR(-EACCES); + } + return d_splice_alias(inode, dentry); +} + +static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) +{ + struct inode *inode = filp->f_path.dentry->d_inode; + struct btrfs_root *root = btrfs_sb(inode->i_sb); + struct btrfs_item *item; + struct btrfs_dir_item *di; + struct btrfs_key key; + struct btrfs_path path; + int ret; + u32 nritems; + struct btrfs_leaf *leaf; + int slot; + int advance; + unsigned char d_type = DT_UNKNOWN; + int over; + + key.objectid = inode->i_ino; +printk("readdir on dir %Lu pos %Lu\n", key.objectid, filp->f_pos); + key.flags = 0; + btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); + key.offset = filp->f_pos; + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret < 0) { + goto err; + } +printk("first ret %d\n", ret); + advance = filp->f_pos > 0 && ret != 0; + while(1) { + leaf = btrfs_buffer_leaf(path.nodes[0]); + nritems = btrfs_header_nritems(&leaf->header); + slot = path.slots[0]; +printk("leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot); + if (advance) { +printk("advancing!\n"); + if (slot == nritems -1) { + ret = btrfs_next_leaf(root, &path); + if (ret) + break; + leaf = btrfs_buffer_leaf(path.nodes[0]); + nritems = btrfs_header_nritems(&leaf->header); + slot = path.slots[0]; +printk("2leaf %Lu nritems %lu slot %d\n", path.nodes[0]->b_blocknr, nritems, slot); + } else { + slot++; + path.slots[0]++; + } + } + advance = 1; + item = leaf->items + slot; +printk("item key %Lu %u %Lu\n", btrfs_disk_key_objectid(&item->key), + btrfs_disk_key_flags(&item->key), btrfs_disk_key_offset(&item->key)); + if (btrfs_disk_key_objectid(&item->key) != key.objectid) + break; + if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY) + continue; + di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); +printk("filldir name %.*s, objectid %Lu\n", btrfs_dir_name_len(di), + (const char *)(di + 1), btrfs_dir_objectid(di)); + over = filldir(dirent, (const char *)(di + 1), + btrfs_dir_name_len(di), + btrfs_disk_key_offset(&item->key), + btrfs_dir_objectid(di), d_type); + if (over) + break; + filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; + } +printk("filldir all done\n"); + ret = 0; +err: + btrfs_release_path(root, &path); + return ret; +} + +static void btrfs_put_super (struct super_block * sb) +{ + struct btrfs_root *root = btrfs_sb(sb); + int ret; + + ret = close_ctree(root); + if (ret) { + printk("close ctree returns %d\n", ret); + } + sb->s_fs_info = NULL; +} static int btrfs_fill_super(struct super_block * sb, void * data, int silent) { struct inode * inode; - struct dentry * root; + struct dentry * root_dentry; + struct btrfs_super_block *disk_super; + struct buffer_head *bh; + struct btrfs_root *root; sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = BTRFS_SUPER_MAGIC; - sb->s_op = &btrfs_ops; + sb->s_op = &btrfs_super_ops; sb->s_time_gran = 1; - inode = btrfs_get_inode(sb, S_IFDIR | 0755, 0); + + bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize); + if (!bh) { + printk("btrfs: unable to read on disk super\n"); + return -EIO; + } + disk_super = (struct btrfs_super_block *)bh->b_data; + root = open_ctree(sb, bh, disk_super); + sb->s_fs_info = root; + if (!root) { + printk("btrfs: open_ctree failed\n"); + return -EIO; + } + printk("read in super total blocks %Lu root %Lu\n", + btrfs_super_total_blocks(disk_super), + btrfs_super_root_dir(disk_super)); + + inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); if (!inode) return -ENOMEM; + if (inode->i_state & I_NEW) { + btrfs_read_locked_inode(inode); + unlock_new_inode(inode); + } - root = d_alloc_root(inode); - if (!root) { + root_dentry = d_alloc_root(inode); + if (!root_dentry) { iput(inode); return -ENOMEM; } - sb->s_root = root; + sb->s_root = root_dentry; + return 0; } @@ -187,6 +390,24 @@ static struct file_system_type btrfs_fs_type = { .fs_flags = FS_REQUIRES_DEV, }; +static struct super_operations btrfs_super_ops = { + .statfs = simple_statfs, + .drop_inode = generic_delete_inode, + .put_super = btrfs_put_super, + .read_inode = btrfs_read_locked_inode, +}; + +static struct inode_operations btrfs_dir_inode_operations = { + .lookup = btrfs_lookup, +}; + +static struct file_operations btrfs_dir_file_operations = { + .llseek = generic_file_llseek, + .read = generic_read_dir, + .readdir = btrfs_readdir, +}; + + static int __init init_btrfs_fs(void) { printk("btrfs loaded!\n"); diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h index 3adb6e69fe43..9ab27b7491c5 100644 --- a/fs/btrfs/transaction.h +++ b/fs/btrfs/transaction.h @@ -10,7 +10,7 @@ struct btrfs_trans_handle { static inline struct btrfs_trans_handle * btrfs_start_transaction(struct btrfs_root *root, int num_blocks) { - struct btrfs_trans_handle *h = malloc(sizeof(*h)); + struct btrfs_trans_handle *h = kmalloc(sizeof(*h), GFP_NOFS); h->transid = root->root_key.offset; h->blocks_reserved = num_blocks; h->blocks_used = 0; @@ -21,7 +21,7 @@ static inline void btrfs_free_transaction(struct btrfs_root *root, struct btrfs_trans_handle *handle) { memset(handle, 0, sizeof(*handle)); - free(handle); + kfree(handle); } #endif -- GitLab