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fuse: lock page in mkwrite
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>
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parent
385b126815
commit
cca2437045
1 changed files with 9 additions and 6 deletions
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@ -1618,14 +1618,17 @@ static void fuse_vma_close(struct vm_area_struct *vma)
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static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct page *page = vmf->page;
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/*
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* Don't use page->mapping as it may become NULL from a
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* concurrent truncate.
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*/
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struct inode *inode = vma->vm_file->f_mapping->host;
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struct inode *inode = file_inode(vma->vm_file);
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file_update_time(vma->vm_file);
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lock_page(page);
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if (page->mapping != inode->i_mapping) {
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unlock_page(page);
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return VM_FAULT_NOPAGE;
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}
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fuse_wait_on_page_writeback(inode, page->index);
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return 0;
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return VM_FAULT_LOCKED;
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}
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static const struct vm_operations_struct fuse_file_vm_ops = {
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