NeilBrown 518662e0fc NFS: fix usage of mempools. ... When passed GFP flags that allow sleeping (such as GFP_NOIO), mempool_alloc() will never return NULL, it will wait until memory is available. This means that we don't need to handle failure, but that we do need to ensure one thread doesn't call mempool_alloc() twice on the one pool without queuing or freeing the first allocation. If multiple threads did this during times of high memory pressure, the pool could be exhausted and a deadlock could result. pnfs_generic_alloc_ds_commits() attempts to allocate from the nfs_commit_mempool while already holding an allocation from that pool. This is not safe. So change nfs_commitdata_alloc() to take a flag that indicates whether failure is acceptable. In pnfs_generic_alloc_ds_commits(), accept failure and handle it as we currently do. Else where, do not accept failure, and do not handle it. Even when failure is acceptable, we want to succeed if possible. That means both - using an entry from the pool if there is one - waiting for direct reclaim is there isn't. We call mempool_alloc(GFP_NOWAIT) to achieve the first, then kmem_cache_alloc(GFP_NOIO|__GFP_NORETRY) to achieve the second. Each of these can fail, but together they do the best they can without blocking indefinitely. The objects returned by kmem_cache_alloc() will still be freed by mempool_free(). This is safe as mempool_alloc() uses exactly the same function to allocate objects (since the mempool was created with mempool_create_slab_pool()). The object returned by mempool_alloc() and kmem_cache_alloc() are indistinguishable so mempool_free() will handle both identically, either adding to the pool or calling kmem_cache_free(). Also, don't test for failure when allocating from nfs_wdata_mempool. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>		2017-04-20 13:44:05 -04:00
..
9p	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 21:44:35 -08:00
adfs
affs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
afs	afs: Don't wait for page writeback with the page lock held	2017-03-16 16:29:30 +00:00
autofs4	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
befs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
bfs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
btrfs	Merge branch 'for-linus-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2017-04-14 16:53:45 -07:00
cachefiles	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
ceph	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 11:38:56 -08:00
cifs	CIFS: Fix SMB3 mount without specifying a security mechanism	2017-04-13 10:03:26 -05:00
coda	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 11:38:56 -08:00
configfs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
cramfs
crypto	A code cleanup and bugfix for fs/crypto.	2017-03-25 15:36:56 -07:00
debugfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2017-02-23 20:33:51 -08:00
devpts
dlm	net: Work around lockdep limitation in sockets that use sockets	2017-03-09 18:23:27 -08:00
ecryptfs	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 11:38:56 -08:00
efivarfs
efs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
exofs	locking/atomic, kref: Add kref_read()	2017-01-14 11:37:18 +01:00
exportfs	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 11:38:56 -08:00
ext2	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
ext4	statx: Include a mask for stx_attributes in struct statx	2017-04-03 01:06:00 -04:00
f2fs	f2fs: combine nat_bits and free_nid_bitmap cache	2017-03-20 10:00:18 -04:00
fat	fat: fix using uninitialized fields of fat_inode/fsinfo_inode	2017-03-09 17:01:10 -08:00
freevxfs
fscache	KEYS: Differentiate uses of rcu_dereference_key() and user_key_payload()	2017-03-02 10:09:00 +11:00
fuse	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse	2017-03-03 12:14:13 -08:00
gfs2	gfs2: Avoid alignment hole in struct lm_lockname	2017-03-15 10:06:07 -04:00
hfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 21:44:35 -08:00
hfsplus	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
hostfs
hpfs	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
hugetlbfs	hugetlbfs: fix offset overflow in hugetlbfs mmap	2017-04-13 18:24:21 -07:00
isofs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
jbd2	jbd2: don't leak memory if setting up journal fails	2017-03-15 15:08:48 -04:00
jffs2	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
jfs	fs: add i_blocksize()	2017-02-27 18:43:46 -08:00
kernfs	kernfs: Check KERNFS_HAS_RELEASE before calling kernfs_release_file()	2017-03-17 10:25:59 +09:00
lockd	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>	2017-03-02 08:42:29 +01:00
minix	statx: Add a system call to make enhanced file info available	2017-03-02 20:51:15 -05:00
ncpfs	Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-03-03 10:16:38 -08:00
nfs	NFS: fix usage of mempools.	2017-04-20 13:44:05 -04:00
nfs_common
nfsd	NFSD: fix nfsd_reset_versions for NFSv4.	2017-03-10 17:04:50 -05:00
nilfs2	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
nls
notify	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
ntfs	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
ocfs2	net: Work around lockdep limitation in sockets that use sockets	2017-03-09 18:23:27 -08:00
omfs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
openpromfs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
orangefs	orangefs: free superblock when mount fails	2017-04-15 09:39:31 -07:00
overlayfs	overlayfs: remove now unnecessary header file include	2017-03-08 10:42:13 -08:00
proc	thp: fix MADV_DONTNEED vs clear soft dirty race	2017-04-13 18:24:21 -07:00
pstore	fs/pstore: fs/squashfs: change usage of LZ4 to work with new LZ4 version	2017-02-24 17:46:57 -08:00
qnx4
qnx6
quota	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
ramfs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
reiserfs	fs: add i_blocksize()	2017-02-27 18:43:46 -08:00
romfs	romfs: use different way to generate fsid for BLOCK or MTD	2017-01-24 16:26:14 -08:00
squashfs	fs/pstore: fs/squashfs: change usage of LZ4 to work with new LZ4 version	2017-02-24 17:46:57 -08:00
sysfs	sysfs: be careful of error returns from ops->show()	2017-04-08 17:33:32 +02:00
sysv	statx: Add a system call to make enhanced file info available	2017-03-02 20:51:15 -05:00
tracefs
ubifs	statx: Add a system call to make enhanced file info available	2017-03-02 20:51:15 -05:00
udf	statx: Add a system call to make enhanced file info available	2017-03-02 20:51:15 -05:00
ufs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
xfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-04-09 08:26:21 -07:00
aio.c	Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-03-03 10:16:38 -08:00
anon_inodes.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
attr.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>	2017-03-02 08:42:29 +01:00
bad_inode.c	statx: Add a system call to make enhanced file info available	2017-03-02 20:51:15 -05:00
binfmt_aout.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
binfmt_elf_fdpic.c	sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>	2017-03-02 08:42:39 +01:00
binfmt_elf.c	sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>	2017-03-02 08:42:39 +01:00
binfmt_em86.c
binfmt_flat.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
binfmt_misc.c	sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h>	2017-03-02 08:42:37 +01:00
binfmt_script.c
block_dev.c	block: Initialize bd_bdi on inode initialization	2017-03-02 08:56:59 -07:00
buffer.c	sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency	2017-03-02 08:42:37 +01:00
char_dev.c
compat_binfmt_elf.c	fs/binfmt: Convert obsolete cputime type to nsecs	2017-02-01 09:13:51 +01:00
compat_ioctl.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
compat.c	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
coredump.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
dax.c	dax: fix radix tree insertion race	2017-04-08 00:47:49 -07:00
dcache.c	mnt: Protect the mountpoint hashtable with mount_lock	2017-01-10 13:34:43 +13:00
dcookies.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
direct-io.c	fs: add i_blocksize()	2017-02-27 18:43:46 -08:00
drop_caches.c
eventfd.c	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
eventpoll.c	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
exec.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>	2017-03-02 08:42:35 +01:00
fcntl.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>	2017-03-02 08:42:35 +01:00
fhandle.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
file_table.c	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
file.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>	2017-03-02 08:42:29 +01:00
filesystems.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
fs_pin.c
fs_struct.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>	2017-03-02 08:42:35 +01:00
fs-writeback.c	writeback: fix memory leak in wb_queue_work()	2017-03-13 08:27:34 -06:00
inode.c
internal.h	iomap: constify struct iomap_ops	2017-01-30 16:32:25 -08:00
ioctl.c	sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency	2017-03-02 08:42:37 +01:00
iomap.c	iomap: invalidate page caches should be after iomap_dio_complete() in direct write	2017-03-06 09:50:01 -08:00
Kconfig	dax: fix build warnings with FS_DAX and !FS_IOMAP	2017-01-24 16:26:14 -08:00
Kconfig.binfmt
libfs.c	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 11:38:56 -08:00
locks.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
Makefile	logfs: remove from tree	2016-12-14 23:48:11 -05:00
mbcache.c
mount.h	mnt: Tuck mounts under others instead of creating shadow/side mounts.	2017-02-04 00:01:06 +13:00
mpage.c	fs: add i_blocksize()	2017-02-27 18:43:46 -08:00
namei.c	vfs: don't do RCU lookup of empty pathnames	2017-04-15 09:34:52 -07:00
namespace.c	sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
no-block.c
nsfs.c	nsfs: Add an ioctl() to return owner UID of a userns	2017-02-03 14:35:43 +13:00
open.c	vfs: wrap write f_ops with file_{start,end}_write()	2017-02-07 15:05:04 +01:00
pipe.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
pnode.c	mnt: Tuck mounts under others instead of creating shadow/side mounts.	2017-02-04 00:01:06 +13:00
pnode.h	mnt: Tuck mounts under others instead of creating shadow/side mounts.	2017-02-04 00:01:06 +13:00
posix_acl.c	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
proc_namespace.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
read_write.c	Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-03-03 10:16:38 -08:00
readdir.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
select.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>	2017-03-02 08:42:29 +01:00
seq_file.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
signalfd.c
splice.c	Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-03-03 10:16:38 -08:00
stack.c
stat.c	statx: Include a mask for stx_attributes in struct statx	2017-04-03 01:06:00 -04:00
statfs.c
super.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2017-02-23 20:33:51 -08:00
sync.c	vfs: use helper for calling f_op->fsync()	2017-02-20 16:51:23 +01:00
timerfd.c	timerfd: Only check CAP_WAKE_ALARM when it is needed	2017-03-01 12:53:44 +01:00
userfaultfd.c	userfaultfd: report actual registered features in fdinfo	2017-04-08 00:47:48 -07:00
utimes.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
xattr.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00