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51 lines
1.4 KiB
51 lines
1.4 KiB
// 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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