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authorChris Mason <chris.mason@oracle.com>2008-10-31 12:46:39 -0400
committerChris Mason <chris.mason@oracle.com>2008-10-31 12:46:39 -0400
commit70b99e6959a4c28ae1b314985eca731f3db72f1d (patch)
tree81578759fe422f7b17a734b8bf16b042aa02a046
parentd899e05215178fed903ad0e7fc1cb4d8e0cc0a88 (diff)
Btrfs: Compression corner fixes
Make sure we keep page->mapping NULL on the pages we're getting via alloc_page. It gets set so a few of the callbacks can do the right thing, but in general these pages don't have a mapping. Don't try to truncate compressed inline items in btrfs_drop_extents. The whole compressed item must be preserved. Don't try to create multipage inline compressed items. When we try to overwrite just the first page of the file, we would have to read in and recow all the pages after it in the same compressed inline items. For now, only create single page inline items. Make sure we lock pages in the correct order during delalloc. The search into the state tree for delalloc bytes can return bytes before the page we already have locked. Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/compression.c4
-rw-r--r--fs/btrfs/extent_io.c11
-rw-r--r--fs/btrfs/file.c21
-rw-r--r--fs/btrfs/inode.c8
4 files changed, 35 insertions, 9 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 9adaa79adad..354913177ba 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -220,10 +220,12 @@ static void end_compressed_bio_write(struct bio *bio, int err)
*/
inode = cb->inode;
tree = &BTRFS_I(inode)->io_tree;
+ cb->compressed_pages[0]->mapping = cb->inode->i_mapping;
tree->ops->writepage_end_io_hook(cb->compressed_pages[0],
cb->start,
cb->start + cb->len - 1,
NULL, 1);
+ cb->compressed_pages[0]->mapping = NULL;
end_compressed_writeback(inode, cb->start, cb->len);
/* note, our inode could be gone now */
@@ -306,6 +308,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
else
ret = 0;
+ page->mapping = NULL;
if (ret || bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) <
PAGE_CACHE_SIZE) {
bio_get(bio);
@@ -423,6 +426,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
else
ret = 0;
+ page->mapping = NULL;
if (ret || bio_add_page(comp_bio, page, PAGE_CACHE_SIZE, 0) <
PAGE_CACHE_SIZE) {
bio_get(comp_bio);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index eb3c12e7bea..9b37ce6e516 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1242,13 +1242,22 @@ again:
delalloc_end = 0;
found = find_delalloc_range(tree, &delalloc_start, &delalloc_end,
max_bytes);
- if (!found) {
+ if (!found || delalloc_end <= *start) {
*start = delalloc_start;
*end = delalloc_end;
return found;
}
/*
+ * start comes from the offset of locked_page. We have to lock
+ * pages in order, so we can't process delalloc bytes before
+ * locked_page
+ */
+ if (delalloc_start < *start) {
+ delalloc_start = *start;
+ }
+
+ /*
* make sure to limit the number of pages we try to lock down
* if we're looping.
*/
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 238a8e215eb..0c8cc35a8b9 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -368,8 +368,8 @@ int noinline btrfs_drop_extents(struct btrfs_trans_handle *trans,
u64 search_start = start;
u64 leaf_start;
u64 ram_bytes = 0;
- u8 compression = 0;
- u8 encryption = 0;
+ u8 compression;
+ u8 encryption;
u16 other_encoding = 0;
u64 root_gen;
u64 root_owner;
@@ -415,6 +415,8 @@ next_slot:
leaf_start = 0;
root_gen = 0;
root_owner = 0;
+ compression = 0;
+ encryption = 0;
extent = NULL;
leaf = path->nodes[0];
slot = path->slots[0];
@@ -546,8 +548,12 @@ next_slot:
inline_limit - key.offset);
inode_sub_bytes(inode, extent_end -
inline_limit);
- btrfs_truncate_item(trans, root, path,
- new_size, 1);
+ btrfs_set_file_extent_ram_bytes(leaf, extent,
+ new_size);
+ if (!compression && !encryption) {
+ btrfs_truncate_item(trans, root, path,
+ new_size, 1);
+ }
}
}
/* delete the entire extent */
@@ -567,8 +573,11 @@ next_slot:
new_size = btrfs_file_extent_calc_inline_size(
extent_end - end);
inode_sub_bytes(inode, end - key.offset);
- ret = btrfs_truncate_item(trans, root, path,
- new_size, 0);
+ btrfs_set_file_extent_ram_bytes(leaf, extent,
+ new_size);
+ if (!compression && !encryption)
+ ret = btrfs_truncate_item(trans, root, path,
+ new_size, 0);
BUG_ON(ret);
}
/* create bookend, splitting the extent in two */
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 789c376157f..806708dd7e3 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -239,6 +239,7 @@ static int cow_file_range_inline(struct btrfs_trans_handle *trans,
data_len = compressed_size;
if (start > 0 ||
+ actual_end >= PAGE_CACHE_SIZE ||
data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
(!compressed_size &&
(actual_end & (root->sectorsize - 1)) == 0) ||
@@ -248,7 +249,7 @@ static int cow_file_range_inline(struct btrfs_trans_handle *trans,
}
ret = btrfs_drop_extents(trans, root, inode, start,
- aligned_end, aligned_end, &hint_byte);
+ aligned_end, start, &hint_byte);
BUG_ON(ret);
if (isize > actual_end)
@@ -423,6 +424,7 @@ again:
* free any pages it allocated and our page pointer array
*/
for (i = 0; i < nr_pages_ret; i++) {
+ WARN_ON(pages[i]->mapping);
page_cache_release(pages[i]);
}
kfree(pages);
@@ -572,8 +574,10 @@ free_pages_out_fail:
extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree,
start, end, locked_page, 0, 0, 0);
free_pages_out:
- for (i = 0; i < nr_pages_ret; i++)
+ for (i = 0; i < nr_pages_ret; i++) {
+ WARN_ON(pages[i]->mapping);
page_cache_release(pages[i]);
+ }
if (pages)
kfree(pages);