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52 lines
1.4 KiB
52 lines
1.4 KiB
3 years ago
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2005-2020 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* poll operation
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* There is only one filesystem which implements ->poll operation, currently.
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*/
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#include "aufs.h"
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__poll_t aufs_poll(struct file *file, struct poll_table_struct *pt)
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{
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__poll_t mask;
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struct file *h_file;
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struct super_block *sb;
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/* We should pretend an error happened. */
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mask = EPOLLERR /* | EPOLLIN | EPOLLOUT */;
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sb = file->f_path.dentry->d_sb;
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si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
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h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0);
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if (IS_ERR(h_file)) {
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AuDbg("h_file %ld\n", PTR_ERR(h_file));
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goto out;
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}
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mask = vfs_poll(h_file, pt);
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fput(h_file); /* instead of au_read_post() */
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out:
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si_read_unlock(sb);
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if (mask & EPOLLERR)
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AuDbg("mask 0x%x\n", mask);
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return mask;
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}
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