This is a note to let you know that I've just added the patch titled
ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-avoid-deadlocks-in-the-writeback-path-by-using-sb_getblk_gfp.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c45653c341f5c8a0ce19c8f0ad4678640849cb86 Mon Sep 17 00:00:00 2001
From: Nikolay Borisov <[email protected]>
Date: Thu, 2 Jul 2015 01:34:07 -0400
Subject: ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp
From: Nikolay Borisov <[email protected]>
commit c45653c341f5c8a0ce19c8f0ad4678640849cb86 upstream.
Switch ext4 to using sb_getblk_gfp with GFP_NOFS added to fix possible
deadlocks in the page writeback path.
Signed-off-by: Nikolay Borisov <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ext4/extents.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -503,7 +503,7 @@ __read_extent_tree_block(const char *fun
struct buffer_head *bh;
int err;
- bh = sb_getblk(inode->i_sb, pblk);
+ bh = sb_getblk_gfp(inode->i_sb, pblk, __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh))
return ERR_PTR(-ENOMEM);
@@ -1088,7 +1088,7 @@ static int ext4_ext_split(handle_t *hand
err = -EIO;
goto cleanup;
}
- bh = sb_getblk(inode->i_sb, newblock);
+ bh = sb_getblk_gfp(inode->i_sb, newblock, __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh)) {
err = -ENOMEM;
goto cleanup;
@@ -1282,7 +1282,7 @@ static int ext4_ext_grow_indepth(handle_
if (newblock == 0)
return err;
- bh = sb_getblk(inode->i_sb, newblock);
+ bh = sb_getblk_gfp(inode->i_sb, newblock, __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh))
return -ENOMEM;
lock_buffer(bh);
Patches currently in stable-queue which might be from [email protected] are
queue-4.1/bufferhead-add-_gfp-version-for-sb_getblk.patch
queue-4.1/ext4-avoid-deadlocks-in-the-writeback-path-by-using-sb_getblk_gfp.patch
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