From: Jaegeuk Kim jaegeuk@kernel.org
[ Upstream commit bdf03299248916640a835a05d32841bb3d31912d ]
Otherwise, we can hit deadlock by waiting for the locked page in move_data_block in GC.
Thread A Thread B - do_page_mkwrite - f2fs_vm_page_mkwrite - lock_page - f2fs_balance_fs - mutex_lock(gc_mutex) - f2fs_gc - do_garbage_collect - ra_data_block - grab_cache_page - f2fs_balance_fs - mutex_lock(gc_mutex)
Fixes: 39a8695824510 ("f2fs: refactor ->page_mkwrite() flow") Reviewed-by: Chao Yu yuchao0@huawei.com Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/file.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 44bc5f4a9ce19..c3a9da79ac997 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -50,7 +50,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) struct page *page = vmf->page; struct inode *inode = file_inode(vmf->vma->vm_file); struct f2fs_sb_info *sbi = F2FS_I_SB(inode); - struct dnode_of_data dn = { .node_changed = false }; + struct dnode_of_data dn; int err;
if (unlikely(f2fs_cp_error(sbi))) { @@ -63,6 +63,9 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) goto err; }
+ /* should do out of any locked page */ + f2fs_balance_fs(sbi, true); + sb_start_pagefault(inode->i_sb);
f2fs_bug_on(sbi, f2fs_has_inline_data(inode)); @@ -120,8 +123,6 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) out_sem: up_read(&F2FS_I(inode)->i_mmap_sem);
- f2fs_balance_fs(sbi, dn.node_changed); - sb_end_pagefault(inode->i_sb); err: return block_page_mkwrite_return(err);