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Btrfs: tree logging checksum fixes 

This patch contains following things.

1) Limit the max size of btrfs_ordered_sum structure to PAGE_SIZE.  This
struct is kmalloced so we want to keep it reasonable.

2) Replace copy_extent_csums by btrfs_lookup_csums_range.  This was
duplicated code in tree-log.c

3) Remove replay_one_csum. csum items are replayed at the same time as
   replaying file extents. This guarantees we only replay useful csums.

4) nbytes accounting fix.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
wifi-calibration
Yan Zheng 2009-01-06 11:42:00 -05:00 committed by Chris Mason
parent 1ba12553f3
commit 07d400a6df
4 changed files with 130 additions and 232 deletions
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2
fs/btrfs/extent-tree.c
View File

@ -5579,7 +5579,7 @@ int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len)
BUG_ON(ordered->file_offset != file_pos || ordered->len != len);
disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt;
ret = btrfs_lookup_csums_range(root, disk_bytenr,
ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr,
disk_bytenr + len - 1, &list);
while (!list_empty(&list)) {

62
fs/btrfs/file-item.c
View File

@ -27,6 +27,12 @@
#define MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
sizeof(struct btrfs_item) * 2) / \
size) - 1))
#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
sizeof(struct btrfs_ordered_sum)) / \
sizeof(struct btrfs_sector_sum) * \
(r)->sectorsize - (r)->sectorsize)
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 pos,
@ -259,8 +265,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
key.offset = start;
key.type = BTRFS_EXTENT_CSUM_KEY;
ret = btrfs_search_slot(NULL, root->fs_info->csum_root,
&key, path, 0, 0);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto fail;
if (ret > 0 && path->slots[0] > 0) {
@ -279,7 +284,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
while (start <= end) {
leaf = path->nodes[0];
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(root->fs_info->csum_root, path);
ret = btrfs_next_leaf(root, path);
if (ret < 0)
goto fail;
if (ret > 0)
@ -306,33 +311,38 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
continue;
}
size = min(csum_end, end + 1) - start;
sums = kzalloc(btrfs_ordered_sum_size(root, size), GFP_NOFS);
BUG_ON(!sums);
sector_sum = sums->sums;
sums->bytenr = start;
sums->len = size;
offset = (start - key.offset) >>
root->fs_info->sb->s_blocksize_bits;
offset *= csum_size;
csum_end = min(csum_end, end + 1);
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_csum_item);
while (size > 0) {
read_extent_buffer(path->nodes[0], &sector_sum->sum,
((unsigned long)item) + offset,
csum_size);
sector_sum->bytenr = start;
while (start < csum_end) {
size = min_t(size_t, csum_end - start,
MAX_ORDERED_SUM_BYTES(root));
sums = kzalloc(btrfs_ordered_sum_size(root, size),
GFP_NOFS);
BUG_ON(!sums);
size -= root->sectorsize;
start += root->sectorsize;
offset += csum_size;
sector_sum++;
sector_sum = sums->sums;
sums->bytenr = start;
sums->len = size;
offset = (start - key.offset) >>
root->fs_info->sb->s_blocksize_bits;
offset *= csum_size;
while (size > 0) {
read_extent_buffer(path->nodes[0],
&sector_sum->sum,
((unsigned long)item) +
offset, csum_size);
sector_sum->bytenr = start;
size -= root->sectorsize;
start += root->sectorsize;
offset += csum_size;
sector_sum++;
}
list_add_tail(&sums->list, list);
}
list_add_tail(&sums->list, list);
path->slots[0]++;
}
ret = 0;

5
fs/btrfs/inode.c
View File

@ -157,7 +157,6 @@ static noinline int insert_inline_extent(struct btrfs_trans_handle *trans,
key.objectid = inode->i_ino;
key.offset = start;
btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
inode_add_bytes(inode, size);
datasize = btrfs_file_extent_calc_inline_size(cur_size);
inode_add_bytes(inode, size);
@ -920,8 +919,8 @@ static noinline int csum_exist_in_range(struct btrfs_root *root,
struct btrfs_ordered_sum *sums;
LIST_HEAD(list);
ret = btrfs_lookup_csums_range(root, bytenr, bytenr + num_bytes - 1,
&list);
ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr,
bytenr + num_bytes - 1, &list);
if (ret == 0 && list_empty(&list))
return 0;

293
fs/btrfs/tree-log.c
View File

@ -433,49 +433,6 @@ insert:
trans->transid);
}
}
if (overwrite_root &&
key->type == BTRFS_EXTENT_DATA_KEY) {
int extent_type;
struct btrfs_file_extent_item *fi;
fi = (struct btrfs_file_extent_item *)dst_ptr;
extent_type = btrfs_file_extent_type(path->nodes[0], fi);
if (extent_type == BTRFS_FILE_EXTENT_REG ||
extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
struct btrfs_key ins;
ins.objectid = btrfs_file_extent_disk_bytenr(
path->nodes[0], fi);
ins.offset = btrfs_file_extent_disk_num_bytes(
path->nodes[0], fi);
ins.type = BTRFS_EXTENT_ITEM_KEY;
/*
* is this extent already allocated in the extent
* allocation tree? If so, just add a reference
*/
ret = btrfs_lookup_extent(root, ins.objectid,
ins.offset);
if (ret == 0) {
ret = btrfs_inc_extent_ref(trans, root,
ins.objectid, ins.offset,
path->nodes[0]->start,
root->root_key.objectid,
trans->transid, key->objectid);
} else {
/*
* insert the extent pointer in the extent
* allocation tree
*/
ret = btrfs_alloc_logged_extent(trans, root,
path->nodes[0]->start,
root->root_key.objectid,
trans->transid, key->objectid,
&ins);
BUG_ON(ret);
}
}
}
no_copy:
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root, path);
@ -530,6 +487,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
u64 extent_end;
u64 alloc_hint;
u64 start = key->offset;
u64 saved_nbytes;
struct btrfs_file_extent_item *item;
struct inode *inode = NULL;
unsigned long size;
@ -591,17 +549,95 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
}
btrfs_release_path(root, path);
saved_nbytes = inode_get_bytes(inode);
/* drop any overlapping extents */
ret = btrfs_drop_extents(trans, root, inode,
start, extent_end, start, &alloc_hint);
BUG_ON(ret);
/* insert the extent */
ret = overwrite_item(trans, root, path, eb, slot, key);
BUG_ON(ret);
if (found_type == BTRFS_FILE_EXTENT_REG ||
found_type == BTRFS_FILE_EXTENT_PREALLOC) {
unsigned long dest_offset;
struct btrfs_key ins;
/* btrfs_drop_extents changes i_bytes & i_blocks, update it here */
inode_add_bytes(inode, extent_end - start);
ret = btrfs_insert_empty_item(trans, root, path, key,
sizeof(*item));
BUG_ON(ret);
dest_offset = btrfs_item_ptr_offset(path->nodes[0],
path->slots[0]);
copy_extent_buffer(path->nodes[0], eb, dest_offset,
(unsigned long)item, sizeof(*item));
ins.objectid = btrfs_file_extent_disk_bytenr(eb, item);
ins.offset = btrfs_file_extent_disk_num_bytes(eb, item);
ins.type = BTRFS_EXTENT_ITEM_KEY;
if (ins.objectid > 0) {
u64 csum_start;
u64 csum_end;
LIST_HEAD(ordered_sums);
/*
* is this extent already allocated in the extent
* allocation tree? If so, just add a reference
*/
ret = btrfs_lookup_extent(root, ins.objectid,
ins.offset);
if (ret == 0) {
ret = btrfs_inc_extent_ref(trans, root,
ins.objectid, ins.offset,
path->nodes[0]->start,
root->root_key.objectid,
trans->transid, key->objectid);
} else {
/*
* insert the extent pointer in the extent
* allocation tree
*/
ret = btrfs_alloc_logged_extent(trans, root,
path->nodes[0]->start,
root->root_key.objectid,
trans->transid, key->objectid,
&ins);
BUG_ON(ret);
}
btrfs_release_path(root, path);
if (btrfs_file_extent_compression(eb, item)) {
csum_start = ins.objectid;
csum_end = csum_start + ins.offset;
} else {
csum_start = ins.objectid +
btrfs_file_extent_offset(eb, item);
csum_end = csum_start +
btrfs_file_extent_num_bytes(eb, item);
}
ret = btrfs_lookup_csums_range(root->log_root,
csum_start, csum_end - 1,
&ordered_sums);
BUG_ON(ret);
while (!list_empty(&ordered_sums)) {
struct btrfs_ordered_sum *sums;
sums = list_entry(ordered_sums.next,
struct btrfs_ordered_sum,
list);
ret = btrfs_csum_file_blocks(trans,
root->fs_info->csum_root,
sums);
BUG_ON(ret);
list_del(&sums->list);
kfree(sums);
}
} else {
btrfs_release_path(root, path);
}
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
/* inline extents are easy, we just overwrite them */
ret = overwrite_item(trans, root, path, eb, slot, key);
BUG_ON(ret);
}
inode_set_bytes(inode, saved_nbytes);
btrfs_update_inode(trans, root, inode);
out:
if (inode)
@ -902,70 +938,6 @@ out_nowrite:
return 0;
}
/*
* replay one csum item from the log tree into the subvolume 'root'
* eb, slot and key all refer to the log tree
* path is for temp use by this function and should be released on return
*
* This copies the checksums out of the log tree and inserts them into
* the subvolume. Any existing checksums for this range in the file
* are overwritten, and new items are added where required.
*
* We keep this simple by reusing the btrfs_ordered_sum code from
* the data=ordered mode. This basically means making a copy
* of all the checksums in ram, which we have to do anyway for kmap
* rules.
*
* The copy is then sent down to btrfs_csum_file_blocks, which
* does all the hard work of finding existing items in the file
* or adding new ones.
*/
static noinline int replay_one_csum(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct extent_buffer *eb, int slot,
struct btrfs_key *key)
{
int ret;
u32 item_size = btrfs_item_size_nr(eb, slot);
u64 cur_offset;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
unsigned long file_bytes;
struct btrfs_ordered_sum *sums;
struct btrfs_sector_sum *sector_sum;
unsigned long ptr;
file_bytes = (item_size / csum_size) * root->sectorsize;
sums = kzalloc(btrfs_ordered_sum_size(root, file_bytes), GFP_NOFS);
if (!sums)
return -ENOMEM;
INIT_LIST_HEAD(&sums->list);
sums->len = file_bytes;
sums->bytenr = key->offset;
/*
* copy all the sums into the ordered sum struct
*/
sector_sum = sums->sums;
cur_offset = key->offset;
ptr = btrfs_item_ptr_offset(eb, slot);
while (item_size > 0) {
sector_sum->bytenr = cur_offset;
read_extent_buffer(eb, &sector_sum->sum, ptr, csum_size);
sector_sum++;
item_size -= csum_size;
ptr += csum_size;
cur_offset += root->sectorsize;
}
/* let btrfs_csum_file_blocks add them into the file */
ret = btrfs_csum_file_blocks(trans, root->fs_info->csum_root, sums);
BUG_ON(ret);
kfree(sums);
return 0;
}
/*
* There are a few corners where the link count of the file can't
* be properly maintained during replay. So, instead of adding
@ -1659,10 +1631,6 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb,
ret = replay_one_extent(wc->trans, root, path,
eb, i, &key);
BUG_ON(ret);
} else if (key.type == BTRFS_EXTENT_CSUM_KEY) {
ret = replay_one_csum(wc->trans, root, path,
eb, i, &key);
BUG_ON(ret);
} else if (key.type == BTRFS_DIR_ITEM_KEY ||
key.type == BTRFS_DIR_INDEX_KEY) {
ret = replay_one_dir_item(wc->trans, root, path,
@ -2021,7 +1989,7 @@ int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root)
.process_func = process_one_buffer
};
if (!root->log_root)
if (!root->log_root || root->fs_info->log_root_recovering)
return 0;
log = root->log_root;
@ -2453,86 +2421,6 @@ static int drop_objectid_items(struct btrfs_trans_handle *trans,
return 0;
}
static noinline int copy_extent_csums(struct btrfs_trans_handle *trans,
struct list_head *list,
struct btrfs_root *root,
u64 disk_bytenr, u64 len)
{
struct btrfs_ordered_sum *sums;
struct btrfs_sector_sum *sector_sum;
int ret;
struct btrfs_path *path;
struct btrfs_csum_item *item = NULL;
u64 end = disk_bytenr + len;
u64 item_start_offset = 0;
u64 item_last_offset = 0;
u32 diff;
u32 sum;
u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);
sums = kzalloc(btrfs_ordered_sum_size(root, len), GFP_NOFS);
sector_sum = sums->sums;
sums->bytenr = disk_bytenr;
sums->len = len;
list_add_tail(&sums->list, list);
path = btrfs_alloc_path();
while (disk_bytenr < end) {
if (!item || disk_bytenr < item_start_offset ||
disk_bytenr >= item_last_offset) {
struct btrfs_key found_key;
u32 item_size;
if (item)
btrfs_release_path(root, path);
item = btrfs_lookup_csum(NULL, root, path,
disk_bytenr, 0);
if (IS_ERR(item)) {
ret = PTR_ERR(item);
if (ret == -ENOENT || ret == -EFBIG)
ret = 0;
sum = 0;
printk(KERN_INFO "log no csum found for "
"byte %llu\n",
(unsigned long long)disk_bytenr);
item = NULL;
btrfs_release_path(root, path);
goto found;
}
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
path->slots[0]);
item_start_offset = found_key.offset;
item_size = btrfs_item_size_nr(path->nodes[0],
path->slots[0]);
item_last_offset = item_start_offset +
(item_size / csum_size) *
root->sectorsize;
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_csum_item);
}
/*
* this byte range must be able to fit inside
* a single leaf so it will also fit inside a u32
*/
diff = disk_bytenr - item_start_offset;
diff = diff / root->sectorsize;
diff = diff * csum_size;
read_extent_buffer(path->nodes[0], &sum,
((unsigned long)item) + diff,
csum_size);
found:
sector_sum->bytenr = disk_bytenr;
sector_sum->sum = sum;
disk_bytenr += root->sectorsize;
sector_sum++;
}
btrfs_free_path(path);
return 0;
}
static noinline int copy_items(struct btrfs_trans_handle *trans,
struct btrfs_root *log,
struct btrfs_path *dst_path,
@ -2622,10 +2510,10 @@ static noinline int copy_items(struct btrfs_trans_handle *trans,
trans->transid,
ins_keys[i].objectid);
BUG_ON(ret);
ret = copy_extent_csums(trans,
&ordered_sums,
log->fs_info->csum_root,
ds + cs, cl);
ret = btrfs_lookup_csums_range(
log->fs_info->csum_root,
ds + cs, ds + cs + cl - 1,
&ordered_sums);
BUG_ON(ret);
}
}
@ -2942,9 +2830,9 @@ again:
tmp_key.offset = (u64)-1;
wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key);
BUG_ON(!wc.replay_dest);
wc.replay_dest->log_root = log;
btrfs_record_root_in_trans(wc.replay_dest);
ret = walk_log_tree(trans, log, &wc);
BUG_ON(ret);
@ -2961,6 +2849,7 @@ again:
}
key.offset = found_key.offset - 1;
wc.replay_dest->log_root = NULL;
free_extent_buffer(log->node);
kfree(log);