Qu Wenruo f26c923860 btrfs: remove reada infrastructure ... Currently there is only one user for btrfs metadata readahead, and that's scrub. But even for the single user, it's not providing the correct functionality it needs, as scrub needs reada for commit root, which current readahead can't provide. (Although it's pretty easy to add such feature). Despite this, there are some extra problems related to metadata readahead: - Duplicated feature with btrfs_path::reada - Partly duplicated feature of btrfs_fs_info::buffer_radix Btrfs already caches its metadata in buffer_radix, while readahead tries to read the tree block no matter if it's already cached. - Poor layer separation Metadata readahead works kinda at device level. This is definitely not the correct layer it should be, since metadata is at btrfs logical address space, it should not bother device at all. This brings extra chance for bugs to sneak in, while brings unnecessary complexity. - Dead code In the very beginning of scrub.c we have #undef DEBUG, rendering all the debug related code useless and unable to test. Thus here I purpose to remove the metadata readahead mechanism completely. [BENCHMARK] There is a full benchmark for the scrub performance difference using the old btrfs_reada_add() and btrfs_path::reada. For the worst case (no dirty metadata, slow HDD), there could be a 5% performance drop for scrub. For other cases (even SATA SSD), there is no distinguishable performance difference. The number is reported scrub speed, in MiB/s. The resolution is limited by the reported duration, which only has a resolution of 1 second. Old New Diff SSD 455.3 466.332 +2.42% HDD 103.927 98.012 -5.69% Comprehensive test methodology is in the cover letter of the patch. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>		2022-01-07 14:18:26 +01:00
..
9p	netfs, 9p, afs, ceph: Use folios	2021-11-10 21:16:56 +00:00
adfs
affs	affs: use bdev_nr_sectors instead of open coding it	2021-10-18 14:43:22 -06:00
afs	afs: Fix mmap	2021-12-16 09:10:13 -08:00
autofs	autofs: fix wait name hash calculation in autofs_wait()	2021-10-20 21:09:02 -04:00
befs
bfs
btrfs	btrfs: remove reada infrastructure	2022-01-07 14:18:26 +01:00
cachefiles	for-5.16/ki_complete-2021-10-29	2021-11-01 10:17:11 -07:00
ceph	ceph: fix up non-directory creation in SGID directories	2021-12-01 17:08:27 +01:00
cifs	cifs: sanitize multiple delimiters in prepath	2021-12-17 19:16:49 -06:00
coda	coda: bump module version to 7.2	2021-11-09 10:02:51 -08:00
configfs
cramfs	cramfs: use bdev_nr_bytes instead of open coding it	2021-10-18 14:43:22 -06:00
crypto	fscrypt: improve a few comments	2021-10-25 19:11:50 -07:00
debugfs	debugfs: debugfs_create_file_size(): use IS_ERR to check for error	2021-09-21 09:09:06 +02:00
devpts
dlm
ecryptfs
efivarfs
efs
erofs	erofs: fix deadlock when shrink erofs slab	2021-11-23 14:58:16 +08:00
exfat	exfat: fix incorrect loading of i_blocks for large files	2021-11-01 07:49:21 +09:00
exportfs
ext2	ext2: fix sleeping in atomic bugs on error	2021-09-22 13:05:23 +02:00
ext4	Only bug fixes and cleanups for ext4 this merge window. Of note are	2021-11-10 17:05:37 -08:00
f2fs	Update to zstd-1.4.10	2021-11-13 15:32:30 -08:00
fat	for-5.16/inode-sync-2021-10-29	2021-11-01 10:25:27 -07:00
freevxfs
fscache	fscache: Remove an unused static variable	2021-10-04 22:13:12 +01:00
fuse	fuse: release pipe buf after last use	2021-11-25 14:05:18 +01:00
gfs2	gfs2: gfs2_create_inode rework	2021-12-02 12:41:10 +01:00
hfs	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
hfsplus	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
hostfs
hpfs	treewide: Replace open-coded flex arrays in unions	2021-10-18 12:28:53 -07:00
hugetlbfs	mm,hugetlb: remove mlock ulimit for SHM_HUGETLB	2021-11-09 10:02:48 -08:00
iomap	iomap: iomap_read_inline_data cleanup	2021-11-24 10:15:47 -08:00
isofs	isofs: Fix out of bound access for corrupted isofs image	2021-10-19 12:51:02 +02:00
jbd2
jffs2
jfs	Just one JFS patch	2021-11-03 09:23:25 -07:00
kernfs	Merge 5.15-rc6 into driver-core-next	2021-10-18 09:43:37 +02:00
ksmbd	ksmbd: disable SMB2_GLOBAL_CAP_ENCRYPTION for SMB 3.1.1	2021-12-17 19:19:45 -06:00
lockd	A slow cycle for nfsd: mainly cleanup, including Neil's patch dropping	2021-11-10 16:45:54 -08:00
minix
netfs	netfs: fix parameter of cleanup()	2021-12-07 15:47:09 +00:00
nfs	NFS client bugfixes for Linux 5.16	2021-11-27 10:33:55 -08:00
nfs_common	nfs: Fix kerneldoc warning shown up by W=1	2021-10-04 22:02:17 +01:00
nfsd	NFSD: Fix READDIR buffer overflow	2021-12-18 17:11:06 -05:00
nilfs2	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
nls
notify	fanotify: Allow users to request FAN_FS_ERROR events	2021-10-27 12:53:45 +02:00
ntfs	fs: ntfs: Limit NTFS_RW to page sizes smaller than 64k	2021-11-27 14:34:41 -08:00
ntfs3	gfs2: Fix mmap + page fault deadlocks	2021-11-02 12:25:03 -07:00
ocfs2	Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-11-10 16:15:54 -08:00
omfs
openpromfs
orangefs	orangefs: three fixes from other folks...	2021-11-09 10:34:06 -08:00
overlayfs	overlayfs update for 5.16	2021-11-09 10:51:12 -08:00
proc	proc/vmcore: fix clearing user buffer by properly using clear_user()	2021-11-20 10:35:55 -08:00
pstore	pstore/blk: Use "%lu" to format unsigned long	2021-11-21 09:44:19 -08:00
qnx4	qnx4: work around gcc false positive warning bug	2021-09-21 08:36:48 -07:00
qnx6
quota	\n	2021-11-06 16:40:48 -07:00
ramfs	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
reiserfs	\n	2021-11-06 16:40:48 -07:00
romfs
smbfs_common	cifs: Fix crash on unload of cifs_arc4.ko	2021-12-07 22:38:03 -06:00
squashfs	lib: zstd: Add kernel-specific API	2021-11-08 16:55:21 -08:00
sysfs	fs/sysfs/dir.c: replace S_IRWXU|S_IRUGO|S_IXUGO with 0755 sysfs_create_dir_ns()	2021-10-05 16:35:05 +02:00
sysv	sysv: use BUILD_BUG_ON instead of runtime check	2021-11-09 10:02:52 -08:00
tracefs	tracefs: Set all files to the same group ownership as the mount option	2021-12-08 08:06:40 -05:00
ubifs	fscrypt: remove fscrypt_operations::max_namelen	2021-09-20 19:32:33 -07:00
udf	udf: Fix crash after seekdir	2021-11-09 12:53:58 +01:00
ufs
unicode
vboxsf	vboxfs: fix broken legacy mount signature checking	2021-09-27 11:26:21 -07:00
verity	fs-verity: fix signed integer overflow with i_size near S64_MAX	2021-09-22 10:56:34 -07:00
xfs	xfs: remove all COW fork extents when remounting readonly	2021-12-07 10:17:29 -08:00
zonefs	zonefs: add MODULE_ALIAS_FS	2021-12-17 16:56:35 +09:00
aio.c	aio: Fix incorrect usage of eventfd_signal_allowed()	2021-12-09 10:52:55 -08:00
anon_inodes.c	fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure()	2021-09-19 22:35:37 -04:00
attr.c	fs: handle circular mappings correctly	2021-11-17 09:26:09 +01:00
bad_inode.c
binfmt_aout.c
binfmt_elf.c	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
binfmt_elf_fdpic.c	coredump: Limit coredumps to a single thread group	2021-10-08 12:06:02 -05:00
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
buffer.c	fs: simplify init_page_buffers	2021-10-18 14:43:22 -06:00
char_dev.c
compat_binfmt_elf.c
coredump.c	coredump: Limit coredumps to a single thread group	2021-10-08 12:06:02 -05:00
d_path.c	d_path: fix Kernel doc validator complaining	2021-11-06 13:30:32 -07:00
dax.c
dcache.c
direct-io.c	fs: get rid of the res2 iocb->ki_complete argument	2021-10-25 10:36:24 -06:00
drop_caches.c
eventfd.c
eventpoll.c	ARM development updates for 5.15:	2021-09-09 13:25:49 -07:00
exec.c	Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-11-10 16:15:54 -08:00
fcntl.c
fhandle.c
file.c	fget: clarify and improve __fget_files() implementation	2021-12-13 10:55:30 -08:00
file_table.c
filesystems.c
fs-writeback.c	Various hardening fixes and cleanups for 5.16-rc1	2021-11-01 17:29:10 -07:00
fs_context.c
fs_parser.c	namei: Standardize callers of filename_lookup()	2021-09-07 16:07:47 -04:00
fs_pin.c
fs_struct.c
fs_types.c
fsopen.c
init.c
inode.c	fs: Remove FS_THP_SUPPORT	2021-11-17 10:36:35 -05:00
internal.h	Merge branch 'akpm' (patches from Andrew)	2021-11-09 10:11:53 -08:00
io-wq.c	io-wq: drop wqe lock before creating new worker	2021-12-13 09:04:01 -07:00
io-wq.h	io_uring: optimise INIT_WQ_LIST	2021-10-19 05:49:54 -06:00
io_uring.c	io_uring: zero iocb->ki_pos for stream file types	2021-12-22 20:34:32 -07:00
ioctl.c
Kconfig	4 cifs/smb3 fixes, one for DFS reconnect, and one to begin creating common headers for server and client and the other two to rename the cifs_common directory to smbfs_common to be more consistent ie change use of the name cifs to smb which is more accurate	2021-09-12 10:10:21 -07:00
Kconfig.binfmt
kernel_read_file.c	vfs: check fd has read access in kernel_read_file_from_fd()	2021-10-18 20:22:03 -10:00
libfs.c	libfs: Support RENAME_EXCHANGE in simple_rename()	2021-11-03 15:43:08 +01:00
locks.c	locks: remove changelog comments	2021-10-19 14:11:39 -04:00
Makefile	4 cifs/smb3 fixes, one for DFS reconnect, and one to begin creating common headers for server and client and the other two to rename the cifs_common directory to smbfs_common to be more consistent ie change use of the name cifs to smb which is more accurate	2021-09-12 10:10:21 -07:00
mbcache.c
mount.h
mpage.c
namei.c	File locking changes for v5.16	2021-11-01 09:06:53 -07:00
namespace.c	fs/mount_setattr: always cleanup mount_kattr	2021-12-30 15:12:13 -08:00
no-block.c
nsfs.c
open.c	Merge branch 'akpm' (patches from Andrew)	2021-11-06 14:08:17 -07:00
pipe.c	Revert "mm/gup: remove try_get_page(), call try_get_compound_head() directly"	2021-09-07 11:03:45 -07:00
pnode.c
pnode.h
posix_acl.c	fs/posix_acl.c: avoid -Wempty-body warning	2021-11-06 13:30:32 -07:00
proc_namespace.c
read_write.c	fs: remove leftover comments from mandatory locking removal	2021-10-26 12:20:50 -04:00
readdir.c
remap_range.c
select.c	Revert "memcg: enable accounting for pollfd and select bits arrays"	2021-09-07 11:26:23 -07:00
seq_file.c	seq_file: move seq_escape() to a header	2021-11-09 10:02:52 -08:00
signalfd.c	signalfd: use wake_up_pollfree()	2021-12-09 10:49:56 -08:00
splice.c
stack.c
stat.c
statfs.c
super.c	fs: explicitly unregister per-superblock BDIs	2021-11-06 13:30:34 -07:00
sync.c	block: simplify the block device syncing code	2021-10-22 08:36:55 -06:00
timerfd.c
userfaultfd.c	userfaultfd: fix a race between writeprotect and exit_mmap()	2021-10-18 20:22:02 -10:00
utimes.c
xattr.c