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fuse: Prepare to handle multiple pages in writeback
The .writepages callback will issue writeback requests with more than one page aboard. Make existing end/check code be aware of this. Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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385b126815
1 changed files with 16 additions and 8 deletions
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@ -334,7 +334,8 @@ static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
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BUG_ON(req->inode != inode);
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curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
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if (curr_index == index) {
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if (curr_index <= index &&
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index < curr_index + req->num_pages) {
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found = true;
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break;
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}
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@ -1409,7 +1410,10 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
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static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
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{
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__free_page(req->pages[0]);
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int i;
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for (i = 0; i < req->num_pages; i++)
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__free_page(req->pages[i]);
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fuse_file_put(req->ff, false);
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}
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@ -1418,11 +1422,14 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
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struct inode *inode = req->inode;
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struct fuse_inode *fi = get_fuse_inode(inode);
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struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info;
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int i;
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list_del(&req->writepages_entry);
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dec_bdi_stat(bdi, BDI_WRITEBACK);
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dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP);
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bdi_writeout_inc(bdi);
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for (i = 0; i < req->num_pages; i++) {
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dec_bdi_stat(bdi, BDI_WRITEBACK);
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dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP);
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bdi_writeout_inc(bdi);
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}
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wake_up(&fi->page_waitq);
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}
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@ -1434,14 +1441,15 @@ __acquires(fc->lock)
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struct fuse_inode *fi = get_fuse_inode(req->inode);
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loff_t size = i_size_read(req->inode);
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struct fuse_write_in *inarg = &req->misc.write.in;
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__u64 data_size = req->num_pages * PAGE_CACHE_SIZE;
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if (!fc->connected)
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goto out_free;
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if (inarg->offset + PAGE_CACHE_SIZE <= size) {
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inarg->size = PAGE_CACHE_SIZE;
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if (inarg->offset + data_size <= size) {
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inarg->size = data_size;
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} else if (inarg->offset < size) {
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inarg->size = size & (PAGE_CACHE_SIZE - 1);
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inarg->size = size - inarg->offset;
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} else {
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/* Got truncated off completely */
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goto out_free;
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