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779a6c0bf6
The bug time sequence: 1. thread #1, `zfs_write` assign a txg "n". 2. In a same process, thread #2, mmap page fault (which means the `mm_sem` is hold) occurred, `zfs_dirty_inode` open a txg failed, and wait previous txg "n" completed. 3. thread #1 call `uiomove` to write, however page fault is occurred in `uiomove`, which means it need `mm_sem`, but `mm_sem` is hold by thread #2, so it stuck and can't complete, then txg "n" will not complete. So thread #1 and thread #2 are deadlocked. Reviewed-by: Chunwei Chen <tuxoko@gmail.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Signed-off-by: Grady Wong <grady.w@xtaotech.com> Closes #7939
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://zfsonlinux.org/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SPL_UIO_H
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#define _SPL_UIO_H
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#include <linux/uio.h>
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#include <linux/blkdev.h>
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#include <asm/uaccess.h>
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#include <sys/types.h>
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typedef struct iovec iovec_t;
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typedef enum uio_rw {
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UIO_READ = 0,
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UIO_WRITE = 1,
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} uio_rw_t;
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typedef enum uio_seg {
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UIO_USERSPACE = 0,
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UIO_SYSSPACE = 1,
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UIO_USERISPACE = 2,
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UIO_BVEC = 3,
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} uio_seg_t;
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typedef struct uio {
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union {
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const struct iovec *uio_iov;
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const struct bio_vec *uio_bvec;
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};
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int uio_iovcnt;
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offset_t uio_loffset;
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uio_seg_t uio_segflg;
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boolean_t uio_fault_disable;
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uint16_t uio_fmode;
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uint16_t uio_extflg;
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offset_t uio_limit;
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ssize_t uio_resid;
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size_t uio_skip;
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} uio_t;
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typedef struct aio_req {
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uio_t *aio_uio;
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void *aio_private;
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} aio_req_t;
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typedef enum xuio_type {
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UIOTYPE_ASYNCIO,
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UIOTYPE_ZEROCOPY,
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} xuio_type_t;
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#define UIOA_IOV_MAX 16
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typedef struct uioa_page_s {
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int uioa_pfncnt;
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void **uioa_ppp;
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caddr_t uioa_base;
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size_t uioa_len;
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} uioa_page_t;
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typedef struct xuio {
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uio_t xu_uio;
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enum xuio_type xu_type;
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union {
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struct {
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uint32_t xu_a_state;
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ssize_t xu_a_mbytes;
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uioa_page_t *xu_a_lcur;
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void **xu_a_lppp;
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void *xu_a_hwst[4];
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uioa_page_t xu_a_locked[UIOA_IOV_MAX];
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} xu_aio;
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struct {
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int xu_zc_rw;
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void *xu_zc_priv;
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} xu_zc;
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} xu_ext;
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} xuio_t;
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#define XUIO_XUZC_PRIV(xuio) xuio->xu_ext.xu_zc.xu_zc_priv
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#define XUIO_XUZC_RW(xuio) xuio->xu_ext.xu_zc.xu_zc_rw
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#endif /* SPL_UIO_H */
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