Updated to 5.2.15

1 files changed, 0 insertions, 145 deletions

diff --git a/0003-Btrfs-fix-unwritten-extent-buffers-and-hangs-on-future-writeback-attempts.patch b/0003-Btrfs-fix-unwritten-extent-buffers-and-hangs-on-future-writeback-attempts.patch
deleted file mode 100644
index b6d19c3..0000000
--- a/0003-Btrfs-fix-unwritten-extent-buffers-and-hangs-on-future-writeback-attempts.patch
+++ /dev/null
@@ -1,145 +0,0 @@
-From 45fc8773f47b7cbe56caab0e14abf26d1e044e63 Mon Sep 17 00:00:00 2001
-From: Filipe Manana <fdmanana@suse.com>
-Date: Wed, 11 Sep 2019 17:42:00 +0100
-Subject: Btrfs: fix unwritten extent buffers and hangs on future writeback
- attempts
-
-The lock_extent_buffer_io() returns 1 to the caller to tell it everything
-went fine and the callers needs to start writeback for the extent buffer
-(submit a bio, etc), 0 to tell the caller everything went fine but it does
-not need to start writeback for the extent buffer, and a negative value if
-some error happened.
-
-When it's about to return 1 it tries to lock all pages, and if a try lock
-on a page fails, and we didn't flush any existing bio in our "epd", it
-calls flush_write_bio(epd) and overwrites the return value of 1 to 0 or
-an error. The page might have been locked elsewhere, not with the goal
-of starting writeback of the extent buffer, and even by some code other
-than btrfs, like page migration for example, so it does not mean the
-writeback of the extent buffer was already started by some other task,
-so returning a 0 tells the caller (btree_write_cache_pages()) to not
-start writeback for the extent buffer. Note that epd might currently have
-either no bio, so flush_write_bio() returns 0 (success) or it might have
-a bio for another extent buffer with a lower index (logical address).
-
-Since we return 0 with the EXTENT_BUFFER_WRITEBACK bit set on the
-extent buffer and writeback is never started for the extent buffer,
-future attempts to writeback the extent buffer will hang forever waiting
-on that bit to be cleared, since it can only be cleared after writeback
-completes. Such hang is reported with a trace like the following:
-
-  [49887.347053] INFO: task btrfs-transacti:1752 blocked for more than 122 seconds.
-  [49887.347059]       Not tainted 5.2.13-gentoo #2
-  [49887.347060] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
-  [49887.347062] btrfs-transacti D    0  1752      2 0x80004000
-  [49887.347064] Call Trace:
-  [49887.347069]  ? __schedule+0x265/0x830
-  [49887.347071]  ? bit_wait+0x50/0x50
-  [49887.347072]  ? bit_wait+0x50/0x50
-  [49887.347074]  schedule+0x24/0x90
-  [49887.347075]  io_schedule+0x3c/0x60
-  [49887.347077]  bit_wait_io+0x8/0x50
-  [49887.347079]  __wait_on_bit+0x6c/0x80
-  [49887.347081]  ? __lock_release.isra.29+0x155/0x2d0
-  [49887.347083]  out_of_line_wait_on_bit+0x7b/0x80
-  [49887.347084]  ? var_wake_function+0x20/0x20
-  [49887.347087]  lock_extent_buffer_for_io+0x28c/0x390
-  [49887.347089]  btree_write_cache_pages+0x18e/0x340
-  [49887.347091]  do_writepages+0x29/0xb0
-  [49887.347093]  ? kmem_cache_free+0x132/0x160
-  [49887.347095]  ? convert_extent_bit+0x544/0x680
-  [49887.347097]  filemap_fdatawrite_range+0x70/0x90
-  [49887.347099]  btrfs_write_marked_extents+0x53/0x120
-  [49887.347100]  btrfs_write_and_wait_transaction.isra.4+0x38/0xa0
-  [49887.347102]  btrfs_commit_transaction+0x6bb/0x990
-  [49887.347103]  ? start_transaction+0x33e/0x500
-  [49887.347105]  transaction_kthread+0x139/0x15c
-
-So fix this by not overwriting the return value (ret) with the result
-from flush_write_bio(). We also need to clear the EXTENT_BUFFER_WRITEBACK
-bit in case flush_write_bio() returns an error, otherwise it will hang
-any future attempts to writeback the extent buffer, and undo all work
-done before (set back EXTENT_BUFFER_DIRTY, etc).
-
-This is a regression introduced in the 5.2 kernel.
-
-Fixes: 2e3c25136adfb ("btrfs: extent_io: add proper error handling to lock_extent_buffer_for_io()")
-Fixes: f4340622e0226 ("btrfs: extent_io: Move the BUG_ON() in flush_write_bio() one level up")
-Reported-by: Zdenek Sojka <zsojka@seznam.cz>
-Link: https://lore.kernel.org/linux-btrfs/GpO.2yos.3WGDOLpx6t%7D.1TUDYM@seznam.cz/T/#u
-Reported-by: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
-Link: https://lore.kernel.org/linux-btrfs/5c4688ac-10a7-fb07-70e8-c5d31a3fbb38@profihost.ag/T/#t
-Reported-by: Drazen Kacar <drazen.kacar@oradian.com>
-Link: https://lore.kernel.org/linux-btrfs/DB8PR03MB562876ECE2319B3E579590F799C80@DB8PR03MB5628.eurprd03.prod.outlook.com/
-Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204377
-Signed-off-by: Filipe Manana <fdmanana@suse.com>
----
- fs/btrfs/extent_io.c | 35 ++++++++++++++++++++++++++---------
- 1 file changed, 26 insertions(+), 9 deletions(-)
-
-diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
-index db337e53aab3..93900ff87df7 100644
---- a/fs/btrfs/extent_io.c
-+++ b/fs/btrfs/extent_io.c
-@@ -3591,6 +3591,13 @@ void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
- 		       TASK_UNINTERRUPTIBLE);
- }
- 
-+static void end_extent_buffer_writeback(struct extent_buffer *eb)
-+{
-+	clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags);
-+	smp_mb__after_atomic();
-+	wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK);
-+}
-+
- /*
-  * Lock eb pages and flush the bio if we can't the locks
-  *
-@@ -3662,8 +3669,11 @@ static noinline_for_stack int lock_extent_buffer_for_io(struct extent_buffer *eb
- 
- 		if (!trylock_page(p)) {
- 			if (!flush) {
--				ret = flush_write_bio(epd);
--				if (ret < 0) {
-+				int err;
-+
-+				err = flush_write_bio(epd);
-+				if (err < 0) {
-+					ret = err;
- 					failed_page_nr = i;
- 					goto err_unlock;
- 				}
-@@ -3678,16 +3688,23 @@ err_unlock:
- 	/* Unlock already locked pages */
- 	for (i = 0; i < failed_page_nr; i++)
- 		unlock_page(eb->pages[i]);
-+	/*
-+	 * Clear EXTENT_BUFFER_WRITEBACK and wake up anyone waiting on it.
-+	 * Also set back EXTENT_BUFFER_DIRTY so future attempts to this eb can
-+	 * be made and undo everything done before.
-+	 */
-+	btrfs_tree_lock(eb);
-+	spin_lock(&eb->refs_lock);
-+	set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
-+	end_extent_buffer_writeback(eb);
-+	spin_unlock(&eb->refs_lock);
-+	percpu_counter_add_batch(&fs_info->dirty_metadata_bytes, eb->len,
-+				 fs_info->dirty_metadata_batch);
-+	btrfs_clear_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
-+	btrfs_tree_unlock(eb);
- 	return ret;
- }
- 
--static void end_extent_buffer_writeback(struct extent_buffer *eb)
--{
--	clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags);
--	smp_mb__after_atomic();
--	wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK);
--}
--
- static void set_btree_ioerr(struct page *page)
- {
- 	struct extent_buffer *eb = (struct extent_buffer *)page->private;
--- 
-cgit v1.2.1-1-g437b
-