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Btrfs: Fix hole insertion corner cases

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There were a few places that could cause duplicate extent insertion,
this adjusts the code that creates holes to avoid it.

lookup_extent_map is changed to correctly return all of the extents in a
range, even when there are none matching at the start of the range.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-01-22 16:47:59 -05:00
parent c1e32da616
commit 5f56406aab
4 changed files with 127 additions and 14 deletions
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78
fs/btrfs/file.c
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@@ -278,7 +278,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
u64 hole_size;
u64 mask = root->sectorsize - 1;
last_pos_in_file = (isize + mask) & ~mask;
hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
hole_size = (end_pos - last_pos_in_file + mask) & ~mask;
if (last_pos_in_file < start_pos) {
err = btrfs_drop_extents(trans, root, inode,
@@ -293,6 +293,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
inode->i_ino,
last_pos_in_file,
0, 0, hole_size);
btrfs_check_file(root, inode);
}
if (err)
goto failed;
@@ -378,6 +379,80 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
return 0;
}
int btrfs_check_file(struct btrfs_root *root, struct inode *inode)
{
return 0;
#if 0
struct btrfs_path *path;
struct btrfs_key found_key;
struct extent_buffer *leaf;
struct btrfs_file_extent_item *extent;
u64 last_offset = 0;
int nritems;
int slot;
int found_type;
int ret;
int err = 0;
u64 extent_end = 0;
path = btrfs_alloc_path();
ret = btrfs_lookup_file_extent(NULL, root, path, inode->i_ino,
last_offset, 0);
while(1) {
nritems = btrfs_header_nritems(path->nodes[0]);
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret)
goto out;
nritems = btrfs_header_nritems(path->nodes[0]);
}
slot = path->slots[0];
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
if (found_key.objectid != inode->i_ino)
break;
if (found_key.type != BTRFS_EXTENT_DATA_KEY)
goto out;
if (found_key.offset != last_offset) {
WARN_ON(1);
btrfs_print_leaf(root, leaf);
printk("inode %lu found offset %Lu expected %Lu\n",
inode->i_ino, found_key.offset, last_offset);
err = 1;
goto out;
}
extent = btrfs_item_ptr(leaf, slot,
struct btrfs_file_extent_item);
found_type = btrfs_file_extent_type(leaf, extent);
if (found_type == BTRFS_FILE_EXTENT_REG) {
extent_end = found_key.offset +
btrfs_file_extent_num_bytes(leaf, extent);
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
struct btrfs_item *item;
item = btrfs_item_nr(leaf, slot);
extent_end = found_key.offset +
btrfs_file_extent_inline_len(leaf, item);
extent_end = (extent_end + root->sectorsize - 1) &
~((u64)root->sectorsize -1 );
}
last_offset = extent_end;
path->slots[0]++;
}
if (last_offset < inode->i_size) {
WARN_ON(1);
btrfs_print_leaf(root, leaf);
printk("inode %lu found offset %Lu size %Lu\n", inode->i_ino,
last_offset, inode->i_size);
err = 1;
}
out:
btrfs_free_path(path);
return err;
#endif
}
/*
* this is very complex, but the basic idea is to drop all extents
* in the range start - end. hint_block is filled in with a block number
@@ -436,6 +511,7 @@ next_slot:
slot = path->slots[0];
ret = 0;
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.offset >= end || key.objectid != inode->i_ino) {
goto out;
}