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Merge branch 'error-handling' into for-linus

Browse Source 
Conflicts:
	fs/btrfs/ctree.c
	fs/btrfs/disk-io.c
	fs/btrfs/extent-tree.c
	fs/btrfs/extent_io.c
	fs/btrfs/extent_io.h
	fs/btrfs/inode.c
	fs/btrfs/scrub.c

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2012-03-28 20:31:37 -04:00
parent b5d67f64f9 65139ed992
commit 1d4284bd6e
38 changed files with 2017 additions and 1018 deletions
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250
fs/btrfs/ctree.c
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@ -36,7 +36,7 @@ static int balance_node_right(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *dst_buf,
struct extent_buffer *src_buf);
static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
static void del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int level, int slot);
struct btrfs_path *btrfs_alloc_path(void)
@ -344,8 +344,13 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
if (btrfs_block_can_be_shared(root, buf)) {
ret = btrfs_lookup_extent_info(trans, root, buf->start,
buf->len, &refs, &flags);
BUG_ON(ret);
BUG_ON(refs == 0);
if (ret)
return ret;
if (refs == 0) {
ret = -EROFS;
btrfs_std_error(root->fs_info, ret);
return ret;
}
} else {
refs = 1;
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
@ -364,14 +369,14 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) &&
!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF)) {
ret = btrfs_inc_ref(trans, root, buf, 1, 1);
BUG_ON(ret);
BUG_ON(ret); /* -ENOMEM */
if (root->root_key.objectid ==
BTRFS_TREE_RELOC_OBJECTID) {
ret = btrfs_dec_ref(trans, root, buf, 0, 1);
BUG_ON(ret);
BUG_ON(ret); /* -ENOMEM */
ret = btrfs_inc_ref(trans, root, cow, 1, 1);
BUG_ON(ret);
BUG_ON(ret); /* -ENOMEM */
}
new_flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
} else {
@ -381,14 +386,15 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
ret = btrfs_inc_ref(trans, root, cow, 1, 1);
else
ret = btrfs_inc_ref(trans, root, cow, 0, 1);
BUG_ON(ret);
BUG_ON(ret); /* -ENOMEM */
}
if (new_flags != 0) {
ret = btrfs_set_disk_extent_flags(trans, root,
buf->start,
buf->len,
new_flags, 0);
BUG_ON(ret);
if (ret)
return ret;
}
} else {
if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
@ -397,9 +403,9 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
ret = btrfs_inc_ref(trans, root, cow, 1, 1);
else
ret = btrfs_inc_ref(trans, root, cow, 0, 1);
BUG_ON(ret);
BUG_ON(ret); /* -ENOMEM */
ret = btrfs_dec_ref(trans, root, buf, 1, 1);
BUG_ON(ret);
BUG_ON(ret); /* -ENOMEM */
}
clean_tree_block(trans, root, buf);
*last_ref = 1;
@ -428,7 +434,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
{
struct btrfs_disk_key disk_key;
struct extent_buffer *cow;
int level;
int level, ret;
int last_ref = 0;
int unlock_orig = 0;
u64 parent_start;
@ -480,7 +486,11 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
(unsigned long)btrfs_header_fsid(cow),
BTRFS_FSID_SIZE);
update_ref_for_cow(trans, root, buf, cow, &last_ref);
ret = update_ref_for_cow(trans, root, buf, cow, &last_ref);
if (ret) {
btrfs_abort_transaction(trans, root, ret);
return ret;
}
if (root->ref_cows)
btrfs_reloc_cow_block(trans, root, buf, cow);
@ -947,7 +957,12 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
/* promote the child to a root */
child = read_node_slot(root, mid, 0);
BUG_ON(!child);
if (!child) {
ret = -EROFS;
btrfs_std_error(root->fs_info, ret);
goto enospc;
}
btrfs_tree_lock(child);
btrfs_set_lock_blocking(child);
ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
@ -1023,10 +1038,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
if (btrfs_header_nritems(right) == 0) {
clean_tree_block(trans, root, right);
btrfs_tree_unlock(right);
wret = del_ptr(trans, root, path, level + 1, pslot +
1);
if (wret)
ret = wret;
del_ptr(trans, root, path, level + 1, pslot + 1);
root_sub_used(root, right->len);
btrfs_free_tree_block(trans, root, right, 0, 1, 0);
free_extent_buffer_stale(right);
@ -1048,7 +1060,11 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
* otherwise we would have pulled some pointers from the
* right
*/
BUG_ON(!left);
if (!left) {
ret = -EROFS;
btrfs_std_error(root->fs_info, ret);
goto enospc;
}
wret = balance_node_right(trans, root, mid, left);
if (wret < 0) {
ret = wret;
@ -1064,9 +1080,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
if (btrfs_header_nritems(mid) == 0) {
clean_tree_block(trans, root, mid);
btrfs_tree_unlock(mid);
wret = del_ptr(trans, root, path, level + 1, pslot);
if (wret)
ret = wret;
del_ptr(trans, root, path, level + 1, pslot);
root_sub_used(root, mid->len);
btrfs_free_tree_block(trans, root, mid, 0, 1, 0);
free_extent_buffer_stale(mid);
@ -1905,15 +1919,12 @@ done:
* fixing up pointers when a given leaf/node is not in slot 0 of the
* higher levels
*
* If this fails to write a tree block, it returns -1, but continues
* fixing up the blocks in ram so the tree is consistent.
*/
static int fixup_low_keys(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_disk_key *key, int level)
static void fixup_low_keys(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_disk_key *key, int level)
{
int i;
int ret = 0;
struct extent_buffer *t;
for (i = level; i < BTRFS_MAX_LEVEL; i++) {
@ -1926,7 +1937,6 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans,
if (tslot != 0)
break;
}
return ret;
}
/*
@ -1935,9 +1945,9 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans,
* This function isn't completely safe. It's the caller's responsibility
* that the new key won't break the order
*/
int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *new_key)
void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *new_key)
{
struct btrfs_disk_key disk_key;
struct extent_buffer *eb;
@ -1947,13 +1957,11 @@ int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
slot = path->slots[0];
if (slot > 0) {
btrfs_item_key(eb, &disk_key, slot - 1);
if (comp_keys(&disk_key, new_key) >= 0)
return -1;
BUG_ON(comp_keys(&disk_key, new_key) >= 0);
}
if (slot < btrfs_header_nritems(eb) - 1) {
btrfs_item_key(eb, &disk_key, slot + 1);
if (comp_keys(&disk_key, new_key) <= 0)
return -1;
BUG_ON(comp_keys(&disk_key, new_key) <= 0);
}
btrfs_cpu_key_to_disk(&disk_key, new_key);
@ -1961,7 +1969,6 @@ int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(eb);
if (slot == 0)
fixup_low_keys(trans, root, path, &disk_key, 1);
return 0;
}
/*
@ -2164,12 +2171,11 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
*
* slot and level indicate where you want the key to go, and
* blocknr is the block the key points to.
*
* returns zero on success and < 0 on any error
*/
static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, struct btrfs_disk_key
*key, u64 bytenr, int slot, int level)
static void insert_ptr(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_disk_key *key, u64 bytenr,
int slot, int level)
{
struct extent_buffer *lower;
int nritems;
@ -2179,8 +2185,7 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
lower = path->nodes[level];
nritems = btrfs_header_nritems(lower);
BUG_ON(slot > nritems);
if (nritems == BTRFS_NODEPTRS_PER_BLOCK(root))
BUG();
BUG_ON(nritems == BTRFS_NODEPTRS_PER_BLOCK(root));
if (slot != nritems) {
memmove_extent_buffer(lower,
btrfs_node_key_ptr_offset(slot + 1),
@ -2193,7 +2198,6 @@ static int insert_ptr(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_set_node_ptr_generation(lower, slot, trans->transid);
btrfs_set_header_nritems(lower, nritems + 1);
btrfs_mark_buffer_dirty(lower);
return 0;
}
/*
@ -2214,7 +2218,6 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
struct btrfs_disk_key disk_key;
int mid;
int ret;
int wret;
u32 c_nritems;
c = path->nodes[level];
@ -2271,11 +2274,8 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(c);
btrfs_mark_buffer_dirty(split);
wret = insert_ptr(trans, root, path, &disk_key, split->start,
path->slots[level + 1] + 1,
level + 1);
if (wret)
ret = wret;
insert_ptr(trans, root, path, &disk_key, split->start,
path->slots[level + 1] + 1, level + 1);
if (path->slots[level] >= mid) {
path->slots[level] -= mid;
@ -2564,7 +2564,6 @@ static noinline int __push_leaf_left(struct btrfs_trans_handle *trans,
u32 old_left_nritems;
u32 nr;
int ret = 0;
int wret;
u32 this_item_size;
u32 old_left_item_size;
struct btrfs_map_token token;
@ -2675,9 +2674,7 @@ static noinline int __push_leaf_left(struct btrfs_trans_handle *trans,
clean_tree_block(trans, root, right);
btrfs_item_key(right, &disk_key, 0);
wret = fixup_low_keys(trans, root, path, &disk_key, 1);
if (wret)
ret = wret;
fixup_low_keys(trans, root, path, &disk_key, 1);
/* then fixup the leaf pointer in the path */
if (path->slots[0] < push_items) {
@ -2748,7 +2745,8 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
path->nodes[1], slot - 1, &left);
if (ret) {
/* we hit -ENOSPC, but it isn't fatal here */
ret = 1;
if (ret == -ENOSPC)
ret = 1;
goto out;
}
@ -2770,21 +2768,17 @@ out:
/*
* split the path's leaf in two, making sure there is at least data_size
* available for the resulting leaf level of the path.
*
* returns 0 if all went well and < 0 on failure.
*/
static noinline int copy_for_split(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct extent_buffer *l,
struct extent_buffer *right,
int slot, int mid, int nritems)
static noinline void copy_for_split(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct extent_buffer *l,
struct extent_buffer *right,
int slot, int mid, int nritems)
{
int data_copy_size;
int rt_data_off;
int i;
int ret = 0;
int wret;
struct btrfs_disk_key disk_key;
struct btrfs_map_token token;
@ -2816,12 +2810,9 @@ static noinline int copy_for_split(struct btrfs_trans_handle *trans,
}
btrfs_set_header_nritems(l, mid);
ret = 0;
btrfs_item_key(right, &disk_key, 0);
wret = insert_ptr(trans, root, path, &disk_key, right->start,
path->slots[1] + 1, 1);
if (wret)
ret = wret;
insert_ptr(trans, root, path, &disk_key, right->start,
path->slots[1] + 1, 1);
btrfs_mark_buffer_dirty(right);
btrfs_mark_buffer_dirty(l);
@ -2839,8 +2830,6 @@ static noinline int copy_for_split(struct btrfs_trans_handle *trans,
}
BUG_ON(path->slots[0] < 0);
return ret;
}
/*
@ -3029,12 +3018,8 @@ again:
if (split == 0) {
if (mid <= slot) {
btrfs_set_header_nritems(right, 0);
wret = insert_ptr(trans, root, path,
&disk_key, right->start,
path->slots[1] + 1, 1);
if (wret)
ret = wret;
insert_ptr(trans, root, path, &disk_key, right->start,
path->slots[1] + 1, 1);
btrfs_tree_unlock(path->nodes[0]);
free_extent_buffer(path->nodes[0]);
path->nodes[0] = right;
@ -3042,29 +3027,21 @@ again:
path->slots[1] += 1;
} else {
btrfs_set_header_nritems(right, 0);
wret = insert_ptr(trans, root, path,
&disk_key,
right->start,
insert_ptr(trans, root, path, &disk_key, right->start,
path->slots[1], 1);
if (wret)
ret = wret;
btrfs_tree_unlock(path->nodes[0]);
free_extent_buffer(path->nodes[0]);
path->nodes[0] = right;
path->slots[0] = 0;
if (path->slots[1] == 0) {
wret = fixup_low_keys(trans, root,
path, &disk_key, 1);
if (wret)
ret = wret;
}
if (path->slots[1] == 0)
fixup_low_keys(trans, root, path,
&disk_key, 1);
}
btrfs_mark_buffer_dirty(right);
return ret;
}
ret = copy_for_split(trans, root, path, l, right, slot, mid, nritems);
BUG_ON(ret);
copy_for_split(trans, root, path, l, right, slot, mid, nritems);
if (split == 2) {
BUG_ON(num_doubles != 0);
@ -3072,7 +3049,7 @@ again:
goto again;
}
return ret;
return 0;
push_for_double:
push_for_double_split(trans, root, path, data_size);
@ -3274,11 +3251,9 @@ int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
return ret;
path->slots[0]++;
ret = setup_items_for_insert(trans, root, path, new_key, &item_size,
item_size, item_size +
sizeof(struct btrfs_item), 1);
BUG_ON(ret);
setup_items_for_insert(trans, root, path, new_key, &item_size,
item_size, item_size +
sizeof(struct btrfs_item), 1);
leaf = path->nodes[0];
memcpy_extent_buffer(leaf,
btrfs_item_ptr_offset(leaf, path->slots[0]),
@ -3293,10 +3268,10 @@ int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
* off the end of the item or if we shift the item to chop bytes off
* the front.
*/
int btrfs_truncate_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u32 new_size, int from_end)
void btrfs_truncate_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
u32 new_size, int from_end)
{
int slot;
struct extent_buffer *leaf;
@ -3316,7 +3291,7 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans,
old_size = btrfs_item_size_nr(leaf, slot);
if (old_size == new_size)
return 0;
return;
nritems = btrfs_header_nritems(leaf);
data_end = leaf_data_end(root, leaf);
@ -3390,15 +3365,14 @@ int btrfs_truncate_item(struct btrfs_trans_handle *trans,
btrfs_print_leaf(root, leaf);
BUG();
}
return 0;
}
/*
* make the item pointed to by the path bigger, data_size is the new size.
*/
int btrfs_extend_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
u32 data_size)
void btrfs_extend_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
u32 data_size)
{
int slot;
struct extent_buffer *leaf;
@ -3460,7 +3434,6 @@ int btrfs_extend_item(struct btrfs_trans_handle *trans,
btrfs_print_leaf(root, leaf);
BUG();
}
return 0;
}
/*
@ -3593,7 +3566,7 @@ int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
ret = 0;
if (slot == 0) {
btrfs_cpu_key_to_disk(&disk_key, cpu_key);
ret = fixup_low_keys(trans, root, path, &disk_key, 1);
fixup_low_keys(trans, root, path, &disk_key, 1);
}
if (btrfs_leaf_free_space(root, leaf) < 0) {
@ -3611,17 +3584,16 @@ out:
* to save stack depth by doing the bulk of the work in a function
* that doesn't call btrfs_search_slot
*/
int setup_items_for_insert(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *cpu_key, u32 *data_size,
u32 total_data, u32 total_size, int nr)
void setup_items_for_insert(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
struct btrfs_key *cpu_key, u32 *data_size,
u32 total_data, u32 total_size, int nr)
{
struct btrfs_item *item;
int i;
u32 nritems;
unsigned int data_end;
struct btrfs_disk_key disk_key;
int ret;
struct extent_buffer *leaf;
int slot;
struct btrfs_map_token token;
@ -3687,10 +3659,9 @@ int setup_items_for_insert(struct btrfs_trans_handle *trans,
btrfs_set_header_nritems(leaf, nritems + nr);
ret = 0;
if (slot == 0) {
btrfs_cpu_key_to_disk(&disk_key, cpu_key);
ret = fixup_low_keys(trans, root, path, &disk_key, 1);
fixup_low_keys(trans, root, path, &disk_key, 1);
}
btrfs_unlock_up_safe(path, 1);
btrfs_mark_buffer_dirty(leaf);
@ -3699,7 +3670,6 @@ int setup_items_for_insert(struct btrfs_trans_handle *trans,
btrfs_print_leaf(root, leaf);
BUG();
}
return ret;
}
/*
@ -3726,16 +3696,14 @@ int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
if (ret == 0)
return -EEXIST;
if (ret < 0)
goto out;
return ret;
slot = path->slots[0];
BUG_ON(slot < 0);
ret = setup_items_for_insert(trans, root, path, cpu_key, data_size,
setup_items_for_insert(trans, root, path, cpu_key, data_size,
total_data, total_size, nr);
out:
return ret;
return 0;
}
/*
@ -3771,13 +3739,11 @@ int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
* the tree should have been previously balanced so the deletion does not
* empty a node.
*/
static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int level, int slot)
static void del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_path *path, int level, int slot)
{
struct extent_buffer *parent = path->nodes[level];
u32 nritems;
int ret = 0;
int wret;
nritems = btrfs_header_nritems(parent);
if (slot != nritems - 1) {
@ -3797,12 +3763,9 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_disk_key disk_key;
btrfs_node_key(parent, &disk_key, 0);
wret = fixup_low_keys(trans, root, path, &disk_key, level + 1);
if (wret)
ret = wret;
fixup_low_keys(trans, root, path, &disk_key, level + 1);
}
btrfs_mark_buffer_dirty(parent);
return ret;
}
/*
@ -3815,17 +3778,13 @@ static int del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root,
* The path must have already been setup for deleting the leaf, including
* all the proper balancing. path->nodes[1] must be locked.
*/
static noinline int btrfs_del_leaf(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct extent_buffer *leaf)
static noinline void btrfs_del_leaf(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct extent_buffer *leaf)
{
int ret;
WARN_ON(btrfs_header_generation(leaf) != trans->transid);
ret = del_ptr(trans, root, path, 1, path->slots[1]);
if (ret)
return ret;
del_ptr(trans, root, path, 1, path->slots[1]);
/*
* btrfs_free_extent is expensive, we want to make sure we
@ -3838,7 +3797,6 @@ static noinline int btrfs_del_leaf(struct btrfs_trans_handle *trans,
extent_buffer_get(leaf);
btrfs_free_tree_block(trans, root, leaf, 0, 1, 0);
free_extent_buffer_stale(leaf);
return 0;
}
/*
* delete the item at the leaf level in path. If that empties
@ -3899,8 +3857,7 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
} else {
btrfs_set_path_blocking(path);
clean_tree_block(trans, root, leaf);
ret = btrfs_del_leaf(trans, root, path, leaf);
BUG_ON(ret);
btrfs_del_leaf(trans, root, path, leaf);
}
} else {
int used = leaf_space_used(leaf, 0, nritems);
@ -3908,10 +3865,7 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_disk_key disk_key;
btrfs_item_key(leaf, &disk_key, 0);
wret = fixup_low_keys(trans, root, path,
&disk_key, 1);
if (wret)
ret = wret;
fixup_low_keys(trans, root, path, &disk_key, 1);
}
/* delete the leaf if it is mostly empty */
@ -3939,9 +3893,9 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
if (btrfs_header_nritems(leaf) == 0) {
path->slots[1] = slot;
ret = btrfs_del_leaf(trans, root, path, leaf);
BUG_ON(ret);
btrfs_del_leaf(trans, root, path, leaf);
free_extent_buffer(leaf);
ret = 0;
} else {
/* if we're still in the path, make sure
* we're dirty. Otherwise, one of the
@ -4124,7 +4078,7 @@ find_next_key:
}
btrfs_set_path_blocking(path);
cur = read_node_slot(root, cur, slot);
BUG_ON(!cur);
BUG_ON(!cur); /* -ENOMEM */
btrfs_tree_read_lock(cur);