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Btrfs: Pre-allocate space for data relocation

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Pre-allocate space for data relocation. This can detect ENOPSC
condition caused by fragmentation of free space.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng
2010-05-16 10:49:59 -04:00
committed by Chris Mason
parent 4a500fd178
commit efa5646456
3 changed files with 94 additions and 47 deletions
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44
fs/btrfs/inode.c
View File

@@ -1175,6 +1175,13 @@ out_check:
num_bytes, num_bytes, type);
BUG_ON(ret);
if (root->root_key.objectid ==
BTRFS_DATA_RELOC_TREE_OBJECTID) {
ret = btrfs_reloc_clone_csums(inode, cur_offset,
num_bytes);
BUG_ON(ret);
}
extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree,
cur_offset, cur_offset + num_bytes - 1,
locked_page, EXTENT_CLEAR_UNLOCK_PAGE |
@@ -6080,16 +6087,15 @@ out_unlock:
return err;
}
static int prealloc_file_range(struct inode *inode, u64 start, u64 end,
u64 alloc_hint, int mode, loff_t actual_len)
int btrfs_prealloc_file_range(struct inode *inode, int mode,
u64 start, u64 num_bytes, u64 min_size,
loff_t actual_len, u64 *alloc_hint)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_key ins;
u64 cur_offset = start;
u64 num_bytes = end - start;
int ret = 0;
u64 i_size;
while (num_bytes > 0) {
trans = btrfs_start_transaction(root, 3);
@@ -6098,9 +6104,8 @@ static int prealloc_file_range(struct inode *inode, u64 start, u64 end,
break;
}
ret = btrfs_reserve_extent(trans, root, num_bytes,
root->sectorsize, 0, alloc_hint,
(u64)-1, &ins, 1);
ret = btrfs_reserve_extent(trans, root, num_bytes, min_size,
0, *alloc_hint, (u64)-1, &ins, 1);
if (ret) {
btrfs_end_transaction(trans, root);
break;
@@ -6117,20 +6122,19 @@ static int prealloc_file_range(struct inode *inode, u64 start, u64 end,
num_bytes -= ins.offset;
cur_offset += ins.offset;
alloc_hint = ins.objectid + ins.offset;
*alloc_hint = ins.objectid + ins.offset;
inode->i_ctime = CURRENT_TIME;
BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
(actual_len > inode->i_size) &&
(cur_offset > inode->i_size)) {
(actual_len > inode->i_size) &&
(cur_offset > inode->i_size)) {
if (cur_offset > actual_len)
i_size = actual_len;
i_size_write(inode, actual_len);
else
i_size = cur_offset;
i_size_write(inode, i_size);
btrfs_ordered_update_i_size(inode, i_size, NULL);
i_size_write(inode, cur_offset);
i_size_write(inode, cur_offset);
btrfs_ordered_update_i_size(inode, cur_offset, NULL);
}
ret = btrfs_update_inode(trans, root, inode);
@@ -6216,16 +6220,16 @@ static long btrfs_fallocate(struct inode *inode, int mode,
if (em->block_start == EXTENT_MAP_HOLE ||
(cur_offset >= inode->i_size &&
!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) {
ret = prealloc_file_range(inode,
cur_offset, last_byte,
alloc_hint, mode, offset+len);
ret = btrfs_prealloc_file_range(inode, 0, cur_offset,
last_byte - cur_offset,
1 << inode->i_blkbits,
offset + len,
&alloc_hint);
if (ret < 0) {
free_extent_map(em);
break;
}
}
if (em->block_start <= EXTENT_MAP_LAST_BYTE)
alloc_hint = em->block_start;
free_extent_map(em);
cur_offset = last_byte;