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linux/fs
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Laura Abbott 7d212a5102 FROMLIST: fs/buffer.c: Revoke LRU when trying to drop buffers 
When a buffer is added to the LRU list, a reference is taken which is
not dropped until the buffer is evicted from the LRU list. This is the
correct behavior, however this LRU reference will prevent the buffer
from being dropped. This means that the buffer can't actually be dropped
until it is selected for eviction. There's no bound on the time spent
on the LRU list, which means that the buffer may be undroppable for
very long periods of time. Given that migration involves dropping
buffers, the associated page is now unmigratible for long periods of
time as well. CMA relies on being able to migrate a specific range
of pages, so these types of failures make CMA significantly
less reliable, especially under high filesystem usage.

Rather than waiting for the LRU algorithm to eventually kick out
the buffer, explicitly remove the buffer from the LRU list when trying
to drop it. There is still the possibility that the buffer
could be added back on the list, but that indicates the buffer is
still in use and would probably have other 'in use' indicates to
prevent dropping.

Note: a bug reported by "kernel test robot" lead to a switch from
using xas_for_each() to xa_for_each().

Bug: 174118021
Link: https://lore.kernel.org/linux-fsdevel/cover.1611642038.git.cgoldswo@codeaurora.org/
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>
Cc: Matthew Wilcox <willy@infradead.org>
Reported-by: kernel test robot <oliver.sang@intel.com>
Change-Id: I561fa3ac7e8874e27d4ad8e1d62ab62e18dd419c
2021-01-28 09:49:23 +00:00
..
9p Merge 5.10-rc7 into android-mainline 2020-12-09 08:09:26 +01:00
adfs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
affs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
afs Merge a68a0262ab ("mm/madvise: remove racy mm ownership check") into android-mainline 2020-12-10 11:34:58 +01:00
autofs autofs: harden ioctl table 2020-10-16 11:11:22 -07:00
befs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
bfs bfs: don't use WARNING: string when it's just info. 2021-01-06 14:56:52 +01:00
btrfs This is the 5.10.11 stable release 2021-01-27 12:12:33 +01:00
cachefiles cachefiles: Drop superfluous readpages aops NULL check 2021-01-27 11:55:22 +01:00
ceph Merge 5.10.5 into android12-5.10 2021-01-10 12:19:03 +01:00
cifs This is the 5.10.11 stable release 2021-01-27 12:12:33 +01:00
coda
configfs fs: configfs: delete repeated words in comments 2020-10-16 11:11:19 -07:00
cramfs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
crypto Merge remote-tracking branch 'aosp/upstream-f2fs-stable-linux-5.10.y' into android12-5.10 2021-01-06 09:39:43 -08:00
debugfs debugfs: remove return value of debugfs_create_devm_seqfile() 2020-10-30 08:37:39 +01:00
devpts
dlm networking changes for the 5.10 merge window 2020-10-15 18:42:13 -07:00
ecryptfs Merge 449dc8c970 ("Merge tag 'for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply") into android-mainline 2020-08-08 13:07:20 +02:00
efivarfs efivarfs: revert "fix memory leak in efivarfs_create()" 2020-11-25 16:55:02 +01:00
efs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
erofs Merge 5.10.4 into android12-5.10 2020-12-30 12:47:03 +01:00
exfat exfat: Avoid allocating upcase table using kcalloc() 2020-12-26 16:02:38 +01:00
exportfs
ext2 Merge 0746c4a9f3 ("Merge branch 'i2c/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux") into android-mainline 2020-10-28 21:20:34 +01:00
ext4 This is the 5.10.9 stable release 2021-01-19 18:49:54 +01:00
f2fs Merge remote-tracking branch 'aosp/upstream-f2fs-stable-linux-5.10.y' into android12-5.10 2021-01-06 09:39:43 -08:00
fat [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
freevxfs
fscache Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-06-03 16:27:18 -07:00
fuse FROMLIST: fuse: Introduce passthrough for mmap 2021-01-26 19:07:13 +00:00
gfs2 Merge 34816d20f1 ("Merge tag 'gfs2-v5.10-rc5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2") into android-mainline 2020-12-03 18:58:23 +01:00
hfs Merge c2dc4c073f ("Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost") into android-mainline 2020-11-02 11:59:56 +01:00
hfsplus Merge c2dc4c073f ("Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost") into android-mainline 2020-11-02 11:59:56 +01:00
hostfs
hpfs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
hugetlbfs hugetlbfs: prevent filesystem stacking of hugetlbfs 2020-08-12 10:57:56 -07:00
incfs ANDROID: Incremental fs: Make data validation failure a warn 2021-01-14 16:03:13 +00:00
iomap Merge 5.10-rc3 into android-mainline 2020-11-09 12:49:27 +01:00
isofs fs: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
jbd2 jbd2: fix kernel-doc markups 2020-11-19 22:38:29 -05:00
jffs2 Merge 5.10.5 into android12-5.10 2021-01-10 12:19:03 +01:00
jfs Merge 5.10.4 into android12-5.10 2020-12-30 12:47:03 +01:00
kernfs kernfs: wire up ->splice_read and ->splice_write 2021-01-27 11:55:29 +01:00
lockd lockd: don't use interval-based rebinding over TCP 2020-12-30 11:53:30 +01:00
minix [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
nfs This is the 5.10.9 stable release 2021-01-19 18:49:54 +01:00
nfs_common nfs_common: need lock during iterate through the list 2020-12-30 11:53:45 +01:00
nfsd nfsd: Don't set eof on a truncated READ_PLUS 2021-01-27 11:55:05 +01:00
nilfs2 Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
nls treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
notify Merge 5.10.8 into android12-5.10 2021-01-19 09:33:21 +01:00
ntfs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
ocfs2 Merge e28c0d7c92 ("Merge branch 'akpm' (patches from Andrew)") into android-mainline 2020-11-15 14:37:09 +01:00
omfs fs: omfs: use kmemdup() rather than kmalloc+memcpy 2020-09-22 23:39:45 -04:00
openpromfs
orangefs Merge fb893de323 ("Merge tag 'tag-chrome-platform-for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux") into android-mainline 2020-08-12 12:01:09 +02:00
overlayfs FROMLIST: fs: Generic function to convert iocb to rw flags 2021-01-26 17:20:09 +00:00
proc This is the 5.10.11 stable release 2021-01-27 12:12:33 +01:00
pstore treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
qnx4 [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
qnx6 [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
quota quota: Don't overflow quota file offsets 2021-01-06 14:56:53 +01:00
ramfs ramfs: fix nommu mmap with gaps in the page cache 2020-10-16 11:11:22 -07:00
reiserfs Merge 5.10.5 into android12-5.10 2021-01-10 12:19:03 +01:00
romfs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
squashfs Merge 0746c4a9f3 ("Merge branch 'i2c/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux") into android-mainline 2020-10-28 21:20:34 +01:00
sysfs sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output 2020-10-02 12:02:30 +02:00
sysv [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
tracefs
ubifs Merge remote-tracking branch 'aosp/upstream-f2fs-stable-linux-5.10.y' into android12-5.10 2021-01-06 09:39:43 -08:00
udf Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
ufs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
unicode ANDROID: sync generic casefolding code with patches going upstream 2020-09-27 21:56:06 +00:00
vboxsf Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2020-10-15 15:11:56 -07:00
verity fs-verity: move structs needed for file signing to UAPI header 2020-12-28 14:50:32 -08:00
xfs Merge a349e4c659 ("Merge tag 'xfs-5.10-fixes-7' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux") into android-mainline 2020-11-23 08:00:16 +01:00
zonefs zonefs: select CONFIG_CRC32 2021-01-17 14:17:03 +01:00
aio.c vfs: separate __sb_start_write into blocking and non-blocking helpers 2020-11-10 16:53:07 -08:00
anon_inodes.c
attr.c
bad_inode.c fs: move the fiemap definitions out of fs.h 2020-06-03 23:16:55 -04:00
binfmt_aout.c
binfmt_elf_fdpic.c binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot 2020-10-16 11:11:21 -07:00
binfmt_elf.c fs: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
binfmt_em86.c Merge branch 'akpm' (patches from Andrew) 2020-06-04 19:18:29 -07:00
binfmt_flat.c binfmt_flat: revert "binfmt_flat: don't offset the data start" 2020-08-24 08:49:13 +10:00
binfmt_misc.c Merge branch 'akpm' (patches from Andrew) 2020-06-04 19:18:29 -07:00
binfmt_script.c Merge branch 'akpm' (patches from Andrew) 2020-06-04 19:18:29 -07:00
block_dev.c block: add a bdget_part helper 2020-10-05 10:38:33 -06:00
buffer.c FROMLIST: fs/buffer.c: Revoke LRU when trying to drop buffers 2021-01-28 09:49:23 +00:00
char_dev.c
compat_binfmt_elf.c Split the old READ_IMPLIES_EXEC workaround from executable PT_GNU_STACK 2020-06-05 13:45:21 -07:00
coredump.c coredump: fix core_pattern parse error 2020-12-06 10:19:07 -08:00
d_path.c fs: fix NULL dereference due to data race in prepend_path() 2020-10-14 14:54:45 -07:00
dax.c fuse update for 5.10 2020-10-19 14:28:30 -07:00
dcache.c vfs: Use sequence counter with associated spinlock 2020-07-29 16:14:27 +02:00
dcookies.c
direct-io.c Merge 2d0f6b0aab ("Merge tag 'hyperv-next-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux") into android-mainline 2020-10-26 09:13:37 +01:00
drop_caches.c
eventfd.c
eventpoll.c Merge 5.10.4 into android12-5.10 2020-12-30 12:47:03 +01:00
exec.c exec: Transform exec_update_mutex into a rw_semaphore 2021-01-09 13:46:24 +01:00
fcntl.c fcntl: Fix potential deadlock in send_sig{io, urg}() 2021-01-06 14:56:53 +01:00
fhandle.c
file_table.c task_work: cleanup notification modes 2020-10-17 15:05:30 -06:00
file.c io_uring: don't rely on weak ->files references 2020-09-30 20:32:32 -06:00
filesystems.c
fs_context.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
fs_parser.c fs_parse: mark fs_param_bad_value() as static 2020-10-13 18:38:27 -07:00
fs_pin.c
fs_struct.c vfs: Use sequence counter with associated spinlock 2020-07-29 16:14:27 +02:00
fs_types.c
fs-writeback.c fs: fix lazytime expiration handling in __writeback_single_inode() 2021-01-27 11:54:53 +01:00
fsopen.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
init.c init: add an init_dup helper 2020-08-04 21:02:38 -04:00
inode.c fs: Handle I_DONTCACHE in iput_final() instead of generic_drop_inode() 2020-12-30 11:53:49 +01:00
internal.h fs: remove compat_sys_mount 2020-09-22 23:45:57 -04:00
io_uring.c io_uring: fix short read retries for non-reg files 2021-01-27 11:55:15 +01:00
io-wq.c io-wq: cancel request if it's asking for files and we don't have them 2020-11-04 10:22:56 -07:00
io-wq.h io_uring: fix io_wqe->work_list corruption 2020-12-30 11:54:03 +01:00
ioctl.c fs: remove ksys_ioctl 2020-07-31 08:16:01 +02:00
Kconfig Merge 449dc8c970 ("Merge tag 'for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply") into android-mainline 2020-08-08 13:07:20 +02:00
Kconfig.binfmt treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
kernel_read_file.c fs/kernel_file_read: Add "offset" arg for partial reads 2020-10-05 13:37:04 +02:00
libfs.c libfs: Add generic function for setting dentry_ops 2020-12-21 13:33:13 -08:00
locks.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
Makefile Merge 1f70935f63 ("Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc") into android-mainline 2020-10-27 11:47:16 +01:00
mbcache.c
mount.h
mpage.c Merge 94709049fb ("Merge branch 'akpm' (patches from Andrew)") into android-mainline 2020-06-12 14:39:46 +02:00
namei.c Merge 0746c4a9f3 ("Merge branch 'i2c/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux") into android-mainline 2020-10-28 21:20:34 +01:00
namespace.c umount(2): move the flag validity checks first 2021-01-19 18:27:32 +01:00
no-block.c
nsfs.c
open.c openat2: reject RESOLVE_BENEATH|RESOLVE_IN_ROOT 2020-12-30 11:54:24 +01:00
pipe.c fs/pipe: allow sendfile() to pipe again 2021-01-27 11:55:29 +01:00
pnode.c Revert "ANDROID: mnt: Add filesystem private data to mount points" 2020-08-08 13:04:28 +02:00
pnode.h fs/namespace.c: WARN if mnt_count has become negative 2021-01-06 14:56:54 +01:00
posix_acl.c Merge ad57a1022f ("Merge tag 'exfat-for-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat") into android-mainline 2020-06-24 17:54:12 +02:00
proc_namespace.c proc mountinfo: make splice available again 2020-12-30 11:54:02 +01:00
read_write.c Revert "Revert "fs: remove the compat readv/writev syscalls"" 2020-11-02 09:27:39 +01:00
readdir.c fs: remove ksys_getdents64 2020-07-31 08:16:00 +02:00
remap_range.c vfs: move the remap range helpers to remap_range.c 2020-10-15 09:48:49 -07:00
select.c poll: fix performance regression due to out-of-line __put_user() 2021-01-19 18:27:27 +01:00
seq_file.c fix return values of seq_read_iter() 2020-11-15 22:12:53 -05:00
signalfd.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
splice.c Revert "Revert "fs: remove compat_sys_vmsplice"" 2020-11-02 09:27:41 +01:00
stack.c
stat.c fs: remove KSTAT_QUERY_FLAGS 2020-09-26 22:55:05 -04:00
statfs.c Add a "nosymfollow" mount option. 2020-08-27 16:06:47 -04:00
super.c vfs: move __sb_{start,end}_write* to fs.h 2020-11-10 16:53:11 -08:00
sync.c Linux 5.8-rc1 2020-06-25 14:25:32 +02:00
timerfd.c
userfaultfd.c FROMLIST: mm: protect VMA modifications using VMA sequence count 2021-01-22 17:59:47 +00:00
utimes.c fs: expose utimes_common 2020-07-31 08:16:01 +02:00
xattr.c Merge d5660df4a5 ("Merge branch 'akpm' (patches from Andrew)") into android-mainline 2020-10-25 11:57:29 +01:00