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fuse: lock page in mkwrite

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Lock the page in fuse_page_mkwrite() to protect against a race with
fuse_writepage() where the page is redirtied before the actual writeback
begins.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi 2013-10-01 16:44:51 +02:00
parent 385b126815
commit cca2437045
1 changed files with 9 additions and 6 deletions
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15
fs/fuse/file.c
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@ -1618,14 +1618,17 @@ static void fuse_vma_close(struct vm_area_struct *vma)
static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct page *page = vmf->page;
/*
* Don't use page->mapping as it may become NULL from a
* concurrent truncate.
*/
struct inode *inode = vma->vm_file->f_mapping->host;
struct inode *inode = file_inode(vma->vm_file);
file_update_time(vma->vm_file);
lock_page(page);
if (page->mapping != inode->i_mapping) {
unlock_page(page);
return VM_FAULT_NOPAGE;
}
fuse_wait_on_page_writeback(inode, page->index);
return 0;
return VM_FAULT_LOCKED;
}
static const struct vm_operations_struct fuse_file_vm_ops = {