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OpenCloudOS-Kernel
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fuse: write inode in fuse_vma_close() instead of fuse_release() 

Fuse ->release() is otherwise asynchronous for the reason that it can
happen in contexts unrelated to close/munmap.

Inode is already written back from fuse_flush().  Add it to
fuse_vma_close() as well to make sure inode dirtying from mmaps also get
written out before the file is released.

Also add error handling.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2021-10-22 17:03:01 +02:00
parent 5c791fe1e2
commit 36ea23374d
1 changed files with 6 additions and 9 deletions
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15
fs/fuse/file.c
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@ -339,12 +339,6 @@ static int fuse_open(struct inode *inode, struct file *file)
static int fuse_release(struct inode *inode, struct file *file)
{
struct fuse_conn *fc = get_fuse_conn(inode);
/* see fuse_vma_close() for !writeback_cache case */
if (fc->writeback_cache)
write_inode_now(inode, 1);
fuse_release_common(file, false);
/* return value is ignored by VFS */
@ -2351,12 +2345,15 @@ static int fuse_launder_page(struct page *page)
}
/*
* Write back dirty pages now, because there may not be any suitable
* open files later
* Write back dirty data/metadata now (there may not be any suitable
* open files later for data)
*/
static void fuse_vma_close(struct vm_area_struct *vma)
{
filemap_write_and_wait(vma->vm_file->f_mapping);
int err;
err = write_inode_now(vma->vm_file->f_mapping->host, 1);
mapping_set_error(vma->vm_file->f_mapping, err);
}
/*