Fabio M. De Francesco 21490eff12 hfs: replace kmap() with kmap_local_page() in btree.c ... kmap() is being deprecated in favor of kmap_local_page(). Two main problems with kmap(): (1) It comes with an overhead as mapping space is restricted and protected by a global lock for synchronization and (2) it also requires global TLB invalidation when the kmap's pool wraps and it might block when the mapping space is fully utilized until a slot becomes available. With kmap_local_page() the mappings are per thread, CPU local, can take page faults, and can be called from any context (including interrupts). It is faster than kmap() in kernels with HIGHMEM enabled. Furthermore, the tasks can be preempted and, when they are scheduled to run again, the kernel virtual addresses are restored and still valid. Since its use in btree.c is safe everywhere, it should be preferred. Therefore, replace kmap() with kmap_local_page() in btree.c. Where possible, use the suited standard helpers (memzero_page(), memcpy_page()) instead of open coding kmap_local_page() plus memset() or memcpy(). Tested in a QEMU/KVM x86_32 VM, 6GB RAM, booting a kernel with HIGHMEM64GB enabled. Link: https://lkml.kernel.org/r/20220821180400.8198-4-fmdefrancesco@gmail.com Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Suggested-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Viacheslav Dubeyko <slava@dubeyko.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Chaitanya Kulkarni <kch@nvidia.com> Cc: Christian Brauner (Microsoft) <brauner@kernel.org> Cc: Damien Le Moal <damien.lemoal@opensource.wdc.com> Cc: Jeff Layton <jlayton@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kees Cook <keescook@chromium.org> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2022-09-11 21:55:09 -07:00
..
9p	9p: Fix some kernel-doc comments	2022-07-02 18:52:21 +09:00
adfs	fs: Convert block_read_full_page() to block_read_full_folio()	2022-05-09 16:21:44 -04:00
affs	affs: use memcpy_to_page and remove replace kmap_atomic()	2022-08-01 19:53:31 +02:00
afs	afs: Enable multipage folio support	2022-08-13 17:20:51 -07:00
autofs	autofs: remove unused ino field inode	2022-07-17 17:31:42 -07:00
befs	befs: Convert befs_symlink_read_folio() to use a folio	2022-08-02 12:34:03 -04:00
bfs	fs: Convert block_read_full_page() to block_read_full_folio()	2022-05-09 16:21:44 -04:00
btrfs	for-6.0-rc3-tag	2022-08-28 10:44:04 -07:00
cachefiles	cachefiles: narrow the scope of flushed requests when releasing fd	2022-07-05 16:12:21 +01:00
ceph	We have a good pile of various fixes and cleanups from Xiubo, Jeff,	2022-08-11 12:41:07 -07:00
cifs	cifs: Add helper function to check smb1+ server	2022-08-24 22:30:09 -05:00
coda	coda: Convert coda_symlink_filler() to use a folio	2022-08-02 12:34:03 -04:00
configfs	configfs: fix a race in configfs_{,un}register_subsystem()	2022-02-22 18:30:28 +01:00
cramfs	cramfs: read_mapping_page() is synchronous	2022-08-02 12:34:02 -04:00
crypto	We have a good pile of various fixes and cleanups from Xiubo, Jeff,	2022-08-11 12:41:07 -07:00
debugfs	debugfs: Document that debugfs_create functions need not be error checked	2022-02-25 11:56:13 +01:00
devpts	fsnotify: fix fsnotify hooks in pseudo filesystems	2022-01-24 14:17:02 +01:00
dlm	fs: dlm: move kref_put assert for lkb structs	2022-08-01 09:31:46 -05:00
ecryptfs	ecryptfs: Convert ecryptfs to read_folio	2022-05-09 16:21:45 -04:00
efivarfs	efi: vars: Move efivar caching layer into efivarfs	2022-06-24 20:40:19 +02:00
efs	efs: Convert efs symlinks to read_folio	2022-05-09 16:21:45 -04:00
erofs	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
exfat	exfat: Drop superfluous new line for error messages	2022-08-01 10:14:07 +09:00
exportfs	exportfs: support idmapped mounts	2022-04-28 16:31:10 +02:00
ext2	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
ext4	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
f2fs	f2fs-for-6.0	2022-08-08 11:18:31 -07:00
fat	Updates to various subsystems which I help look after. lib, ocfs2,	2022-08-07 10:03:24 -07:00
freevxfs	freevxfs: Convert vxfs_immed_read_folio() to use a folio	2022-08-02 12:34:03 -04:00
fscache	fscache: add tracepoint when failing cookie	2022-08-09 14:13:59 +01:00
fuse	iov_iter stuff, part 2, rebased	2022-08-08 20:04:35 -07:00
gfs2	New code for 6.0:	2022-08-11 13:11:49 -07:00
hfs	hfs: replace kmap() with kmap_local_page() in btree.c	2022-09-11 21:55:09 -07:00
hfsplus	hfsplus: convert kmap() to kmap_local_page() in btree.c	2022-09-11 21:55:05 -07:00
hostfs	hostfs: Handle page write errors correctly	2022-08-02 12:34:02 -04:00
hpfs	hpfs: Convert symlinks to read_folio	2022-05-09 16:21:45 -04:00
hugetlbfs	iov_iter stuff, part 2, rebased	2022-08-08 20:04:35 -07:00
iomap	New code for 6.0:	2022-08-11 13:11:49 -07:00
isofs	fs/isofs: replace kmap() with kmap_local_page()	2022-09-11 21:55:05 -07:00
jbd2	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
jffs2	This pull request contains fixes for JFFS2, UBI and UBIFS	2022-06-03 14:42:24 -07:00
jfs	Folio changes for 6.0	2022-08-03 10:35:43 -07:00
kernfs	kernfs: Fix typo 'the the' in comment	2022-07-28 10:57:25 +02:00
ksmbd	ksmbd: don't remove dos attribute xattr on O_TRUNC open	2022-08-15 21:07:01 -05:00
lockd	lockd: detect and reject lock arguments that overflow	2022-08-04 10:28:48 -04:00
minix	fs: Convert block_read_full_page() to block_read_full_folio()	2022-05-09 16:21:44 -04:00
netfs	netfs: do not unlock and put the folio twice	2022-07-14 10:10:12 +02:00
nfs	NFS client bugfixes for Linux 6.0	2022-08-22 11:40:01 -07:00
nfs_common
nfsd	NFSD 6.0 Release Notes	2022-08-09 14:56:49 -07:00
nilfs2	Folio changes for 6.0	2022-08-03 10:35:43 -07:00
nls
notify	fsnotify: Fix comment typo	2022-07-26 13:38:47 +02:00
ntfs	Folio changes for 6.0	2022-08-03 10:35:43 -07:00
ntfs3	fs.idmapped.fixes.v6.0-rc3	2022-08-22 11:33:02 -07:00
ocfs2	ocfs2: fix freeing uninitialized resource on ocfs2_dlm_shutdown	2022-08-28 14:02:45 -07:00
omfs	fs: Convert block_read_full_page() to block_read_full_folio()	2022-05-09 16:21:44 -04:00
openpromfs	fs: allocate inode by using alloc_inode_sb()	2022-03-22 15:57:03 -07:00
orangefs	orangefs: Remove test for folio error	2022-06-29 08:51:07 -04:00
overlayfs	acl: handle idmapped mounts for idmapped filesystems	2022-08-17 11:23:31 +02:00
proc	mm/smaps: don't access young/dirty bit if pte unpresent	2022-08-20 15:17:45 -07:00
pstore	EFI updates for v5.20	2022-08-03 14:38:02 -07:00
qnx4	fs: Convert block_read_full_page() to block_read_full_folio()	2022-05-09 16:21:44 -04:00
qnx6	fs/qnx6: delete unnecessary checks before brelse()	2022-09-11 21:55:07 -07:00
quota	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
ramfs
reiserfs	Folio changes for 6.0	2022-08-03 10:35:43 -07:00
romfs	romfs: Convert romfs to read_folio	2022-05-09 16:21:46 -04:00
smbfs_common	Add various fsctl structs	2022-05-23 20:24:12 -05:00
squashfs	squashfs: don't call kmalloc in decompressors	2022-08-28 14:02:45 -07:00
sysfs	kobject: kobj_type: remove default_attrs	2022-04-05 15:39:19 +02:00
sysv	Not a lot of material this cycle. Many singleton patches against various	2022-05-27 11:22:03 -07:00
tracefs	tracefs: Fix syntax errors in comments	2022-06-17 19:01:28 -04:00
ubifs	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
udf	fs/buffer: Combine two submit_bh() and ll_rw_block() arguments	2022-07-14 12:14:32 -06:00
ufs	Folio changes for 6.0	2022-08-03 10:35:43 -07:00
unicode	kbuild: unify cmd_copy and cmd_shipped	2022-02-14 10:37:32 +09:00
vboxsf	vboxsf: Convert vboxsf to read_folio	2022-05-09 16:21:46 -04:00
verity	fs-verity: mention btrfs support	2022-07-15 23:42:30 -07:00
xfs	New code for 6.0:	2022-08-13 13:50:11 -07:00
zonefs	New code for 6.0:	2022-08-11 13:11:49 -07:00
aio.c	aio: use atomic_try_cmpxchg in __get_reqs_available	2022-09-11 21:55:08 -07:00
anon_inodes.c
attr.c	vfs: Check the truncate maximum size in inode_newsize_ok()	2022-08-08 10:39:29 -07:00
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c	coredump: Snapshot the vmas in do_coredump	2022-03-08 12:55:29 -06:00
binfmt_elf_test.c	binfmt_elf: Introduce KUnit test	2022-03-03 20:38:56 -08:00
binfmt_elf.c	revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE"	2022-04-15 14:49:56 -07:00
binfmt_flat.c	binfmt_flat: Remove shared library support	2022-04-22 10:57:18 -07:00
binfmt_misc.c	Fix regression due to "fs: move binfmt_misc sysctl to its own file"	2022-02-09 09:50:02 -08:00
binfmt_script.c
buffer.c	buffer: use try_cmpxchg in discard_buffer	2022-09-11 21:55:07 -07:00
char_dev.c
compat_binfmt_elf.c	binfmt_elf: Introduce KUnit test	2022-03-03 20:38:56 -08:00
coredump.c	fs: do not compare against ->llseek	2022-07-16 09:19:15 -04:00
d_path.c
dax.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
dcache.c	dcache: move the DCACHE_OP_COMPARE case out of the __d_lookup_rcu loop	2022-08-17 14:33:03 -07:00
direct-io.c	iov_iter: advancing variants of iov_iter_get_pages{,_alloc}()	2022-08-08 22:37:22 -04:00
drop_caches.c
eventfd.c
eventpoll.c	epoll: use try_cmpxchg in list_add_tail_lockless	2022-09-11 21:55:07 -07:00
exec.c	execve fix for v6.0-rc2	2022-08-19 14:02:24 -07:00
fcntl.c	keep iocb_flags() result cached in struct file	2022-06-10 16:10:23 -04:00
fhandle.c
file_table.c	iov_iter work, part 1 - isolated cleanups and optimizations.	2022-08-03 13:50:22 -07:00
file.c	fix the breakage in close_fd_get_file() calling conventions change	2022-06-05 15:03:03 -04:00
filesystems.c
fs_context.c
fs_parser.c
fs_pin.c
fs_struct.c
fs_types.c
fs-writeback.c	writeback: avoid use-after-free after removing device	2022-08-28 14:02:43 -07:00
fsopen.c	uninline may_mount() and don't opencode it in fspick(2)/fsopen(2)	2022-05-19 23:25:10 -04:00
init.c
inode.c	fs: __file_remove_privs(): restore call to inode_has_no_xattr()	2022-08-18 09:39:33 +02:00
internal.h	Cleanups (and one fix) around struct mount handling.	2022-06-04 19:00:05 -07:00
ioctl.c	Fixes for 5.18-rc1:	2022-04-01 19:35:56 -07:00
Kconfig	mm: hugetlb_vmemmap: introduce the name HVO	2022-08-08 18:06:42 -07:00
Kconfig.binfmt	m68knommu: changes for linux 5.19	2022-05-30 10:56:18 -07:00
kernel_read_file.c	fs/kernel_read_file: allow to read files up-to ssize_t	2022-06-16 19:58:21 -07:00
libfs.c	fs: Convert simple_readpage to simple_read_folio	2022-05-09 16:21:44 -04:00
locks.c	locks: Fix dropped call to ->fl_release_private()	2022-08-17 15:08:58 -04:00
Makefile	io_uring: move to separate directory	2022-07-24 18:39:10 -06:00
mbcache.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
mount.h	switch try_to_unlazy_next() to __legitimize_mnt()	2022-07-05 16:18:21 -04:00
mpage.c	Folio changes for 6.0	2022-08-03 10:35:43 -07:00
namei.c	fs.setgid.v6.0	2022-08-09 09:52:28 -07:00
namespace.c	fs: require CAP_SYS_ADMIN in target namespace for idmapped mounts	2022-08-17 11:27:11 +02:00
no-block.c
nsfs.c
open.c	iov_iter work, part 1 - isolated cleanups and optimizations.	2022-08-03 13:50:22 -07:00
pipe.c	Not a lot of material this cycle. Many singleton patches against various	2022-05-27 11:22:03 -07:00
pnode.c
pnode.h
posix_acl.c	acl: handle idmapped mounts for idmapped filesystems	2022-08-17 11:23:31 +02:00
proc_namespace.c	vfs: escape hash as well	2022-06-28 13:58:05 -04:00
read_write.c	switch new_sync_{read,write}() to ITER_UBUF	2022-08-08 22:37:15 -04:00
readdir.c
remap_range.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
select.c
seq_file.c	rxrpc: Fix locking issue	2022-05-22 21:03:01 +01:00
signalfd.c
splice.c	iter_to_pipe(): switch to advancing variant of iov_iter_get_pages()	2022-08-08 22:37:23 -04:00
stack.c
stat.c	RISC-V Patches for the 5.19 Merge Window, Part 1	2022-05-31 14:10:54 -07:00
statfs.c
super.c	fuse update for 6.0	2022-08-08 11:10:02 -07:00
sync.c	riscv: compat: syscall: Add compat_sys_call_table implementation	2022-04-26 13:36:25 -07:00
sysctls.c
timerfd.c
userfaultfd.c	mm/uffd: reset write protection when unregister with wp-mode	2022-08-20 15:17:45 -07:00
utimes.c
xattr.c	acl: move idmapped mount fixup into vfs_{g,s}etxattr()	2022-07-15 22:08:59 +02:00