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logfs: update page reference count for pined pages

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LogFS sets PG_private flag to indicate a pined page. We assumed that
marking a page as private is enough to ensure its existence. But
instead it is necessary to hold a reference count to the page.

The change resolves the following BUG

BUG: Bad page state in process flush-253:16  pfn:6a6d0
page flags: 0x100000000000808(uptodate|private)

Suggested-and-Acked-by: Joern Engel <joern@logfs.org>
Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>
This commit is contained in:
Prasad Joshi
2011-11-26 11:00:47 +05:30
parent f423fc627b
commit 96150606e2
2 changed files with 51 additions and 15 deletions
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29
fs/logfs/readwrite.c
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@@ -560,8 +560,13 @@ static void inode_free_block(struct super_block *sb, struct logfs_block *block)
static void indirect_free_block(struct super_block *sb,
struct logfs_block *block)
{
ClearPagePrivate(block->page);
block->page->private = 0;
struct page *page = block->page;
if (PagePrivate(page)) {
ClearPagePrivate(page);
page_cache_release(page);
set_page_private(page, 0);
}
__free_block(sb, block);
}
@@ -650,8 +655,11 @@ static void alloc_data_block(struct inode *inode, struct page *page)
logfs_unpack_index(page->index, &bix, &level);
block = __alloc_block(inode->i_sb, inode->i_ino, bix, level);
block->page = page;
SetPagePrivate(page);
page->private = (unsigned long)block;
page_cache_get(page);
set_page_private(page, (unsigned long) block);
block->ops = &indirect_block_ops;
}
@@ -1901,8 +1909,11 @@ static void move_page_to_inode(struct inode *inode, struct page *page)
li->li_block = block;
block->page = NULL;
page->private = 0;
ClearPagePrivate(page);
if (PagePrivate(page)) {
ClearPagePrivate(page);
page_cache_release(page);
set_page_private(page, 0);
}
}
static void move_inode_to_page(struct page *page, struct inode *inode)
@@ -1918,8 +1929,12 @@ static void move_inode_to_page(struct page *page, struct inode *inode)
BUG_ON(PagePrivate(page));
block->ops = &indirect_block_ops;
block->page = page;
page->private = (unsigned long)block;
SetPagePrivate(page);
if (!PagePrivate(page)) {
SetPagePrivate(page);
page_cache_get(page);
set_page_private(page, (unsigned long) block);
}
block->inode = NULL;
li->li_block = NULL;