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Josef Bacik 52e29e3310 btrfs: don't set path->leave_spinning for truncate The only time we actually leave the path spinning is if we're truncating a small amount and don't actually free an extent, which is not a common occurrence. We have to set the path blocking in order to add the delayed ref anyway, so the first extent we find we set the path to blocking and stay blocking for the duration of the operation. With the upcoming file extent map stuff there will be another case that we have to have the path blocking, so just swap to blocking always. Note: this patch also fixes a warning after `28553fa992` ("Btrfs: fix race between shrinking truncate and fiemap") got merged that inserts extent locks around truncation so the path must not leave spinning locks after btrfs_search_slot. [70.794783] BUG: sleeping function called from invalid context at mm/slab.h:565 [70.794834] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1141, name: rsync [70.794863] 5 locks held by rsync/1141: [70.794876] #0: ffff888417b9c408 (sb_writers#17){.+.+}, at: mnt_want_write+0x20/0x50 [70.795030] #1: ffff888428de28e8 (&type->i_mutex_dir_key#13/1){+.+.}, at: lock_rename+0xf1/0x100 [70.795051] #2: ffff888417b9c608 (sb_internal#2){.+.+}, at: start_transaction+0x394/0x560 [70.795124] #3: ffff888403081768 (btrfs-fs-01){++++}, at: btrfs_try_tree_write_lock+0x2f/0x160 [70.795203] #4: ffff888403086568 (btrfs-fs-00){++++}, at: btrfs_try_tree_write_lock+0x2f/0x160 [70.795222] CPU: 5 PID: 1141 Comm: rsync Not tainted 5.6.0-rc2-backup+ #2 [70.795362] Call Trace: [70.795374] dump_stack+0x71/0xa0 [70.795445] ___might_sleep.part.96.cold.106+0xa6/0xb6 [70.795459] kmem_cache_alloc+0x1d3/0x290 [70.795471] alloc_extent_state+0x22/0x1c0 [70.795544] __clear_extent_bit+0x3ba/0x580 [70.795557] ? _raw_spin_unlock_irq+0x24/0x30 [70.795569] btrfs_truncate_inode_items+0x339/0xe50 [70.795647] btrfs_evict_inode+0x269/0x540 [70.795659] ? dput.part.38+0x29/0x460 [70.795671] evict+0xcd/0x190 [70.795682] __dentry_kill+0xd6/0x180 [70.795754] dput.part.38+0x2ad/0x460 [70.795765] do_renameat2+0x3cb/0x540 [70.795777] __x64_sys_rename+0x1c/0x20 Reported-by: Dave Jones <davej@codemonkey.org.uk> Fixes: `28553fa992` ("Btrfs: fix race between shrinking truncate and fiemap") CC: stable@vger.kernel.org # 4.4+ Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> [ add note ] Signed-off-by: David Sterba <dsterba@suse.com>		2020-02-17 16:23:06 +01:00
arch	RISC-V updates for v5.5-rc7	2020-01-19 12:10:28 -08:00
block	block: fix an integer overflow in logical block size	2020-01-15 21:43:09 -07:00
certs	certs: Add wrapper function to check blacklisted binary hash	2019-11-12 12:25:50 +11:00
crypto	tpmdd fixes for Linux v5.5-rc3	2019-12-18 17:17:36 -08:00
Documentation	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-01-19 12:03:53 -08:00
drivers	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-01-19 12:03:53 -08:00
fs	btrfs: don't set path->leave_spinning for truncate	2020-02-17 16:23:06 +01:00
include	bitmap: genericize percpu bitmap region iterators	2020-01-20 16:40:56 +01:00
init	mm, debug_pagealloc: don't rely on static keys too early	2020-01-13 18:19:02 -08:00
ipc	treewide: Use sizeof_field() macro	2019-12-09 10:36:44 -08:00
kernel	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-01-19 12:03:53 -08:00
lib	lib/vdso: Make __cvdso_clock_getres() static	2020-01-10 19:29:01 +01:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	bitmap: genericize percpu bitmap region iterators	2020-01-20 16:40:56 +01:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-01-19 12:03:53 -08:00
samples	samples/seccomp: Zero out members based on seccomp_notif_sizes	2020-01-02 13:03:39 -08:00
scripts	Kbuild fixes for v5.5 (2nd)	2020-01-03 11:21:25 -08:00
security	+ Bug fixes	2020-01-04 19:28:30 -08:00
sound	sound fixes for 5.5-rc7	2020-01-17 08:38:35 -08:00
tools	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-01-19 12:03:53 -08:00
usr	gen_initramfs_list.sh: fix 'bad variable name' error	2020-01-04 00:00:48 +09:00
virt	PPC KVM fix for 5.5	2019-12-22 13:18:15 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
.mailmap	MAINTAINERS: update my email address	2020-01-11 14:33:39 -08:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Linux 5.4-rc4	2019-10-29 04:43:29 -06:00
Kbuild	kbuild: do not descend to ./Kbuild when cleaning	2019-08-21 21:03:58 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-01-19 12:03:53 -08:00
Makefile	Linux 5.5-rc7	2020-01-19 16:02:49 -08:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.