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btrfs: replace async_cow::root with fs_info 

The async_cow::root is used to propagate fs_info to async_cow_submit.
We can't use inode to reach it because it could become NULL after
write without compression in async_cow_start.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2018-11-22 17:16:44 +01:00
parent 06ea01b1ee
commit 600b6cf468
1 changed files with 3 additions and 6 deletions
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9
fs/btrfs/inode.c
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@ -358,7 +358,7 @@ struct async_extent {
struct async_cow {
struct inode *inode;
struct btrfs_root *root;
struct btrfs_fs_info *fs_info;
struct page *locked_page;
u64 start;
u64 end;
@ -1144,13 +1144,11 @@ static noinline void async_cow_submit(struct btrfs_work *work)
{
struct btrfs_fs_info *fs_info;
struct async_cow *async_cow;
struct btrfs_root *root;
unsigned long nr_pages;
async_cow = container_of(work, struct async_cow, work);
root = async_cow->root;
fs_info = root->fs_info;
fs_info = async_cow->fs_info;
nr_pages = (async_cow->end - async_cow->start + PAGE_SIZE) >>
PAGE_SHIFT;
@ -1179,7 +1177,6 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct async_cow *async_cow;
struct btrfs_root *root = BTRFS_I(inode)->root;
unsigned long nr_pages;
u64 cur_end;
@ -1189,7 +1186,7 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS);
BUG_ON(!async_cow); /* -ENOMEM */
async_cow->inode = igrab(inode);
async_cow->root = root;
async_cow->fs_info = fs_info;
async_cow->locked_page = locked_page;
async_cow->start = start;
async_cow->write_flags = write_flags;