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Btrfs: Fix the unplug_io_fn to grab a consistent copy of page->mapping

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-22 13:26:47 -04:00
parent e1c4b7451e
commit bcbfce8abd
2 changed files with 22 additions and 7 deletions
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13
fs/btrfs/disk-io.c
View File

@ -936,14 +936,25 @@ void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
struct inode *inode;
struct extent_map_tree *em_tree;
struct extent_map *em;
struct address_space *mapping;
u64 offset;
/* the generic O_DIRECT read code does this */
if (!page) {
__unplug_io_fn(bdi, page);
return;
}
inode = page->mapping->host;
/*
* page->mapping may change at any time. Get a consistent copy
* and use that for everything below
*/
smp_mb();
mapping = page->mapping;
if (!mapping)
return;
inode = mapping->host;
offset = page_offset(page);
em_tree = &BTRFS_I(inode)->extent_tree;

16
fs/btrfs/inode.c
View File

@ -80,6 +80,7 @@ int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
u64 thresh;
unsigned long flags;
int ret = 0;
if (for_del)
@ -89,10 +90,10 @@ int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
do_div(thresh, 100);
spin_lock(&root->fs_info->delalloc_lock);
spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
if (used + root->fs_info->delalloc_bytes + num_required > thresh)
ret = -ENOSPC;
spin_unlock(&root->fs_info->delalloc_lock);
spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
return ret;
}
@ -275,12 +276,13 @@ static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
unsigned long old, unsigned long bits)
{
unsigned long flags;
if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
struct btrfs_root *root = BTRFS_I(inode)->root;
spin_lock(&root->fs_info->delalloc_lock);
spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
BTRFS_I(inode)->delalloc_bytes += end - start + 1;
root->fs_info->delalloc_bytes += end - start + 1;
spin_unlock(&root->fs_info->delalloc_lock);
spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
}
return 0;
}
@ -290,7 +292,9 @@ int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
{
if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
struct btrfs_root *root = BTRFS_I(inode)->root;
spin_lock(&root->fs_info->delalloc_lock);
unsigned long flags;
spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
if (end - start + 1 > root->fs_info->delalloc_bytes) {
printk("warning: delalloc account %Lu %Lu\n",
end - start + 1, root->fs_info->delalloc_bytes);
@ -300,7 +304,7 @@ int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
root->fs_info->delalloc_bytes -= end - start + 1;
BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
}
spin_unlock(&root->fs_info->delalloc_lock);
spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
}
return 0;
}