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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable

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* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable:
  Btrfs: check return value of alloc_extent_map()
  Btrfs - Fix memory leak in btrfs_init_new_device()
  btrfs: prevent heap corruption in btrfs_ioctl_space_info()
  Btrfs: Fix balance panic
  Btrfs: don't release pages when we can't clear the uptodate bits
  Btrfs: fix page->private races
This commit is contained in:
Linus Torvalds
2011-02-15 08:00:35 -08:00
parent 261cd298a8 c26a920373
commit 007a14af26
9 changed files with 68 additions and 11 deletions
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48
fs/btrfs/extent_io.c
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@@ -1946,6 +1946,7 @@ void set_page_extent_mapped(struct page *page)
static void set_page_extent_head(struct page *page, unsigned long len)
{
WARN_ON(!PagePrivate(page));
set_page_private(page, EXTENT_PAGE_PRIVATE_FIRST_PAGE | len << 2);
}
@@ -2821,9 +2822,17 @@ int try_release_extent_state(struct extent_map_tree *map,
* at this point we can safely clear everything except the
* locked bit and the nodatasum bit
*/
clear_extent_bit(tree, start, end,
ret = clear_extent_bit(tree, start, end,
~(EXTENT_LOCKED | EXTENT_NODATASUM),
0, 0, NULL, mask);
/* if clear_extent_bit failed for enomem reasons,
* we can't allow the release to continue.
*/
if (ret < 0)
ret = 0;
else
ret = 1;
}
return ret;
}
@@ -3194,7 +3203,13 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
}
if (!PageUptodate(p))
uptodate = 0;
unlock_page(p);
/*
* see below about how we avoid a nasty race with release page
* and why we unlock later
*/
if (i != 0)
unlock_page(p);
}
if (uptodate)
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
@@ -3218,9 +3233,26 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
atomic_inc(&eb->refs);
spin_unlock(&tree->buffer_lock);
radix_tree_preload_end();
/*
* there is a race where release page may have
* tried to find this extent buffer in the radix
* but failed. It will tell the VM it is safe to
* reclaim the, and it will clear the page private bit.
* We must make sure to set the page private bit properly
* after the extent buffer is in the radix tree so
* it doesn't get lost
*/
set_page_extent_mapped(eb->first_page);
set_page_extent_head(eb->first_page, eb->len);
if (!page0)
unlock_page(eb->first_page);
return eb;
free_eb:
if (eb->first_page && !page0)
unlock_page(eb->first_page);
if (!atomic_dec_and_test(&eb->refs))
return exists;
btrfs_release_extent_buffer(eb);
@@ -3271,10 +3303,11 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
continue;
lock_page(page);
WARN_ON(!PagePrivate(page));
set_page_extent_mapped(page);
if (i == 0)
set_page_extent_head(page, eb->len);
else
set_page_private(page, EXTENT_PAGE_PRIVATE);
clear_page_dirty_for_io(page);
spin_lock_irq(&page->mapping->tree_lock);
@@ -3464,6 +3497,13 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
for (i = start_i; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
WARN_ON(!PagePrivate(page));
set_page_extent_mapped(page);
if (i == 0)
set_page_extent_head(page, eb->len);
if (inc_all_pages)
page_cache_get(page);
if (!PageUptodate(page)) {