AuxXxilium/linux_dsm_epyc7002
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f27c9298fd
linux_dsm_epyc7002/fs
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J. Bruce Fields f27c9298fd exportfs: fix quadratic behavior in filehandle lookup 
Suppose we're given the filehandle for a directory whose closest
ancestor in the dcache is its Nth ancestor.

The main loop in reconnect_path searches for an IS_ROOT ancestor of
target_dir, reconnects that ancestor to its parent, then recommences the
search for an IS_ROOT ancestor from target_dir.

This behavior is quadratic in N.  And there's really no need to restart
the search from target_dir each time: once a directory has been looked
up, it won't become IS_ROOT again.  So instead of starting from
target_dir each time, we can continue where we left off.

This simplifies the code and improves performance on very deep directory
heirachies.  (I can't think of any reason anyone should need heirarchies
a hundred or more deep, but the performance improvement may be valuable
if only to limit damage in case of abuse.)

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09 00:16:38 -05:00
..
9p 9p: make v9fs_cache_inode_{get,put,set}_cookie empty inlines for !9P_CACHEFS 2013-10-24 23:34:47 -04:00
adfs adfs: delayed freeing of sbi 2013-10-24 23:43:27 -04:00
affs truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
afs afs: dget_parent() can't return a negative dentry 2013-09-29 22:02:24 -04:00
autofs4 autofs4: make freeing sbi rcu-delayed 2013-10-24 23:43:27 -04:00
befs befs: split symlink iops in two - for short and long symlinks resp. 2013-10-24 23:34:50 -04:00
bfs truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
btrfs btrfs: Fix crash due to not allocating integrity data for a bioset 2013-10-05 10:52:10 -04:00
cachefiles CacheFiles: Don't try to dump the index key if the cookie has been cleared 2013-09-20 15:15:43 -07:00
ceph ceph: use d_invalidate() to invalidate aliases 2013-09-06 12:55:29 -07:00
cifs cifs: rcu-delay unload_nls() and freeing sbi 2013-10-24 23:43:27 -04:00
coda coda_revalidate_inode(): switch to passing inode... 2013-11-09 00:16:21 -05:00
configfs
cramfs
debugfs
devpts
dlm
ecryptfs file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
efivarfs
efs
exofs truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
exportfs exportfs: fix quadratic behavior in filehandle lookup 2013-11-09 00:16:38 -05:00
ext2 truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
ext3 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2013-09-06 09:06:02 -07:00
ext4 Merge branch 'akpm' (patches from Andrew Morton) 2013-09-12 15:44:27 -07:00
f2fs f2fs: optimize gc for better performance 2013-09-05 13:50:32 +09:00
fat fat: rcu-delay unloading nls and freeing sbi 2013-10-24 23:43:28 -04:00
freevxfs
fscache Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2013-09-19 12:50:37 -05:00
fuse fuse: rcu-delay freeing fuse_conn 2013-10-24 23:45:13 -04:00
gfs2 new helper: kfree_put_link() 2013-10-24 23:34:49 -04:00
hfs truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
hfsplus truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
hostfs um: hostfs: Fix writeback 2013-09-07 10:38:29 +02:00
hpfs hpfs: make freeing sbi and codetables rcu-delayed 2013-10-24 23:43:26 -04:00
hppfs
hugetlbfs
isofs isofs: don't pass dentry to isofs_hash{i,}_common() 2013-10-24 23:34:59 -04:00
jbd
jbd2
jffs2
jfs truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
lockd
logfs
minix truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
ncpfs ncpfs: rcu-delay unload_nls() and freeing ncp_server 2013-10-24 23:43:28 -04:00
nfs nfs: use %p[dD] instead of open-coded (and often racy) equivalents 2013-10-24 23:34:50 -04:00
nfs_common
nfsd nfsd: switch to %p[dD] 2013-10-24 23:34:51 -04:00
nilfs2 nilfs2: fix issue with race condition of competition between segments for dirty blocks 2013-09-30 14:31:02 -07:00
nls
notify
ntfs iget/iget5: don't bother with ->i_lock until we find a match 2013-11-09 00:16:31 -05:00
ocfs2 ocfs2: get rid of impossible checks 2013-11-09 00:16:32 -05:00
omfs truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
openpromfs
proc new helper: kfree_put_link() 2013-10-24 23:34:49 -04:00
pstore pstore: Remove the messages related to compression failure 2013-09-16 09:28:29 -07:00
qnx4 qnx4: i_sb is never NULL 2013-11-09 00:16:32 -05:00
qnx6
quota fs: convert fs shrinkers to new scan/count API 2013-09-10 18:56:31 -04:00
ramfs initmpfs: move rootfs code from fs/ramfs/ to init/ 2013-09-11 15:59:37 -07:00
reiserfs reiserfs: fix race with flush_used_journal_lists and flush_journal_list 2013-09-24 11:24:21 +02:00
romfs
squashfs Squashfs: add corruption check for type in squashfs_readdir() 2013-09-06 04:57:54 +01:00
sysfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-09-07 14:36:57 -07:00
sysv sysv: Add forgotten superblock lock init for v7 fs 2013-09-29 22:02:02 -04:00
ubifs ubifs: switch to %pd 2013-10-24 23:34:51 -04:00
udf udf: Fortify LVID loading 2013-09-24 11:23:33 +02:00
ufs truncate: drop 'oldsize' truncate_pagecache() parameter 2013-09-12 15:38:02 -07:00
xfs xfs: Use kmem_free() instead of free() 2013-10-04 13:56:12 -05:00
aio.c rework aio migrate pages to use aio fs 2013-11-09 00:16:28 -05:00
anon_inodes.c ... and kill anon_inode_getfile_private() 2013-11-09 00:16:28 -05:00
attr.c
bad_inode.c
binfmt_aout.c dump_skip(): dump_seek() replacement taking coredump_params 2013-11-09 00:16:26 -05:00
binfmt_elf_fdpic.c elf{,_fdpic} coredump: get rid of pointless if (siginfo->si_signo) 2013-11-09 00:16:30 -05:00
binfmt_elf.c elf{,_fdpic} coredump: get rid of pointless if (siginfo->si_signo) 2013-11-09 00:16:30 -05:00
binfmt_em86.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c Merge branch 'for-3.12/core' of git://git.kernel.dk/linux-block 2013-09-22 15:00:11 -07:00
bio.c block: Fix bio_copy_data() 2013-09-24 14:41:42 -07:00
block_dev.c a trivial writeback fix 2013-09-13 23:06:40 -04:00
buffer.c
char_dev.c consolidate the reassignments of ->f_op in ->open() instances 2013-10-24 23:34:53 -04:00
compat_binfmt_elf.c
compat_ioctl.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
compat.c
coredump.c constify do_coredump() argument 2013-11-09 00:16:29 -05:00
coredump.h
dcache.c dcache: don't clear DCACHE_DISCONNECTED too early 2013-11-09 00:16:34 -05:00
dcookies.c
direct-io.c direct-io: Use return from cmpxchg to decide of assignment happened 2013-09-09 10:47:42 -07:00
drop_caches.c shrinker: add node awareness 2013-09-10 18:56:31 -04:00
eventfd.c
eventpoll.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
exec.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
fcntl.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
fhandle.c
file_table.c get rid of s_files and files_lock 2013-11-09 00:16:20 -05:00
file.c
filesystems.c
fs_struct.c
fs-writeback.c new helpers: lock_mount_hash/unlock_mount_hash 2013-10-24 23:34:59 -04:00
generic_acl.c
inode.c iget/iget5: don't bother with ->i_lock until we find a match 2013-11-09 00:16:31 -05:00
internal.h get rid of s_files and files_lock 2013-11-09 00:16:20 -05:00
ioctl.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
ioprio.c
Kconfig
Kconfig.binfmt
libfs.c take anon inode allocation to libfs.c 2013-11-09 00:16:27 -05:00
locks.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
Makefile
mbcache.c fs: convert fs shrinkers to new scan/count API 2013-09-10 18:56:31 -04:00
mount.h RCU'd vfsmounts 2013-11-09 00:16:19 -05:00
mpage.c
namei.c dcache: fix outdated DCACHE_NEED_LOOKUP comment 2013-11-09 00:16:34 -05:00
namespace.c RCU'd vfsmounts 2013-11-09 00:16:19 -05:00
no-block.c
open.c get rid of s_files and files_lock 2013-11-09 00:16:20 -05:00
pipe.c
pnode.c split __lookup_mnt() in two functions 2013-10-24 23:35:00 -04:00
pnode.h
posix_acl.c
proc_namespace.c don't bother with vfsmount_lock in mounts_poll() 2013-10-24 23:34:59 -04:00
read_write.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
readdir.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
select.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
seq_file.c
signalfd.c
splice.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
stack.c
stat.c vfs: split out vfs_getattr_nosec 2013-11-09 00:16:31 -05:00
statfs.c
super.c get rid of s_files and files_lock 2013-11-09 00:16:20 -05:00
sync.c file->f_op is never NULL... 2013-10-24 23:34:54 -04:00
timerfd.c
utimes.c
xattr_acl.c
xattr.c