Btrfs: Fix the unplug_io_fn to grab a consistent copy of page->mapping
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
e1c4b7451e
commit
bcbfce8abd
|
@ -936,14 +936,25 @@ void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
|
||||||
struct inode *inode;
|
struct inode *inode;
|
||||||
struct extent_map_tree *em_tree;
|
struct extent_map_tree *em_tree;
|
||||||
struct extent_map *em;
|
struct extent_map *em;
|
||||||
|
struct address_space *mapping;
|
||||||
u64 offset;
|
u64 offset;
|
||||||
|
|
||||||
|
/* the generic O_DIRECT read code does this */
|
||||||
if (!page) {
|
if (!page) {
|
||||||
__unplug_io_fn(bdi, page);
|
__unplug_io_fn(bdi, page);
|
||||||
return;
|
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);
|
offset = page_offset(page);
|
||||||
|
|
||||||
em_tree = &BTRFS_I(inode)->extent_tree;
|
em_tree = &BTRFS_I(inode)->extent_tree;
|
||||||
|
|
|
@ -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 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
|
||||||
u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
|
u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
|
||||||
u64 thresh;
|
u64 thresh;
|
||||||
|
unsigned long flags;
|
||||||
int ret = 0;
|
int ret = 0;
|
||||||
|
|
||||||
if (for_del)
|
if (for_del)
|
||||||
|
@ -89,10 +90,10 @@ int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
|
||||||
|
|
||||||
do_div(thresh, 100);
|
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)
|
if (used + root->fs_info->delalloc_bytes + num_required > thresh)
|
||||||
ret = -ENOSPC;
|
ret = -ENOSPC;
|
||||||
spin_unlock(&root->fs_info->delalloc_lock);
|
spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
|
||||||
return ret;
|
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,
|
int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
|
||||||
unsigned long old, unsigned long bits)
|
unsigned long old, unsigned long bits)
|
||||||
{
|
{
|
||||||
|
unsigned long flags;
|
||||||
if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
|
if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
|
||||||
struct btrfs_root *root = BTRFS_I(inode)->root;
|
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;
|
BTRFS_I(inode)->delalloc_bytes += end - start + 1;
|
||||||
root->fs_info->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;
|
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)) {
|
if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
|
||||||
struct btrfs_root *root = BTRFS_I(inode)->root;
|
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) {
|
if (end - start + 1 > root->fs_info->delalloc_bytes) {
|
||||||
printk("warning: delalloc account %Lu %Lu\n",
|
printk("warning: delalloc account %Lu %Lu\n",
|
||||||
end - start + 1, root->fs_info->delalloc_bytes);
|
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;
|
root->fs_info->delalloc_bytes -= end - start + 1;
|
||||||
BTRFS_I(inode)->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;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in a new issue