spl: drop patch already contained in 0.7.13

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
This commit is contained in:
Stoiko Ivanov 2019-03-07 18:03:51 +01:00 committed by Thomas Lamprecht
parent 256c6c0238
commit d8740a92c1
2 changed files with 0 additions and 43 deletions

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@ -1,42 +0,0 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: ilbsmart <wgqimut@gmail.com>
Date: Wed, 17 Oct 2018 02:11:24 +0800
Subject: [PATCH] deadlock between mm_sem and tx assign in zfs_write() and page
fault
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
(backported from: zfs-upstream 779a6c0bf6df76e0dd92c1ccf81f48512b835bb0)
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
---
include/sys/uio.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/sys/uio.h b/include/sys/uio.h
index 764beb9..2895690 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -53,6 +53,7 @@ typedef struct uio {
int uio_iovcnt;
offset_t uio_loffset;
uio_seg_t uio_segflg;
+ boolean_t uio_fault_disable;
uint16_t uio_fmode;
uint16_t uio_extflg;
offset_t uio_limit;

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0001-deadlock-between-mm_sem-and-tx-assign-in-zfs_write-a.patch