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From: Chengguang Xu <cgxu519@mykernel.net>
To: miklos@szeredi.hu, viro@zeniv.linux.org.uk, amir73il@gmail.com
Cc: linux-fsdevel@vger.kernel.org, linux-unionfs@vger.kernel.org,
	Chengguang Xu <cgxu519@mykernel.net>
Subject: [RFC PATCH v3 0/9] Suppress negative dentry
Date: Fri, 15 May 2020 15:20:38 +0800	[thread overview]
Message-ID: <20200515072047.31454-1-cgxu519@mykernel.net> (raw)

This series adds a new lookup flag LOOKUP_DONTCACHE_NEGATIVE
to indicate to drop negative dentry in slow path of lookup.

In overlayfs, negative dentries in upper/lower layers are useless
after construction of overlayfs' own dentry, so in order to
effectively reclaim those dentries, specify LOOKUP_DONTCACHE_NEGATIVE
flag when doing lookup in upper/lower layers.

Patch 1 adds flag LOOKUP_DONTCACHE_NEGATIVE and related logic in vfs layer.
Patch 2 does lookup optimazation for overlayfs.
Patch 3-9 just adjusts function argument when calling
lookup_positive_unlocked() and lookup_one_len_unlocked().

v1->v2:
- Only drop negative dentry in slow path of lookup.

v2->v3:
- Drop negative dentry in vfs layer.
- Rebase on latest linus-tree(5.7.0-rc5).

Chengguang Xu (9):
  fs/dcache: Introduce a new lookup flag LOOKUP_DONTCACHE_NEGATIVE
  ovl: Suppress negative dentry in lookup
  cifs: Adjust argument for lookup_positive_unlocked()
  debugfs: Adjust argument for lookup_positive_unlocked()
  ecryptfs: Adjust argument for lookup_one_len_unlocked()
  exportfs: Adjust argument for lookup_one_len_unlocked()
  kernfs: Adjust argument for lookup_positive_unlocked()
  nfsd: Adjust argument for lookup_positive_unlocked()
  quota: Adjust argument for lookup_positive_unlocked()

 fs/cifs/cifsfs.c      |  2 +-
 fs/debugfs/inode.c    |  2 +-
 fs/ecryptfs/inode.c   |  2 +-
 fs/exportfs/expfs.c   |  2 +-
 fs/kernfs/mount.c     |  2 +-
 fs/namei.c            | 14 ++++++++++----
 fs/nfsd/nfs3xdr.c     |  2 +-
 fs/nfsd/nfs4xdr.c     |  3 ++-
 fs/overlayfs/namei.c  |  9 +++++----
 fs/quota/dquot.c      |  3 ++-
 include/linux/namei.h |  9 +++++++--
 11 files changed, 32 insertions(+), 18 deletions(-)

-- 
2.20.1



             reply	other threads:[~2020-05-15  7:37 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15  7:20 Chengguang Xu [this message]
2020-05-15  7:20 ` [RFC PATCH v3 1/9] fs/dcache: Introduce a new lookup flag LOOKUP_DONTCACHE_NEGATIVE Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 2/9] ovl: Suppress negative dentry in lookup Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 3/9] cifs: Adjust argument for lookup_positive_unlocked() Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 4/9] debugfs: " Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 5/9] ecryptfs: Adjust argument for lookup_one_len_unlocked() Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 6/9] exportfs: " Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 7/9] kernfs: Adjust argument for lookup_positive_unlocked() Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 8/9] nfsd: " Chengguang Xu
2020-05-15  7:20 ` [RFC PATCH v3 9/9] quota: " Chengguang Xu
2020-05-15  7:30 ` [RFC PATCH v3 0/9] Suppress negative dentry Amir Goldstein
2020-05-15  8:25   ` Chengguang Xu
2020-05-15  8:42     ` Miklos Szeredi
2020-05-18  0:53 ` Ian Kent
2020-05-18  5:27   ` Amir Goldstein
2020-05-18  7:52     ` Miklos Szeredi
2020-05-18  8:51       ` Amir Goldstein
2020-05-18  9:17         ` Miklos Szeredi
2020-05-19  5:01       ` cgxu
2020-05-19  8:21         ` Miklos Szeredi
2020-05-19  9:23           ` cgxu
2020-05-20 14:44             ` Miklos Szeredi
2020-05-25 13:37               ` Chengguang Xu
2020-05-25 13:50                 ` Miklos Szeredi
2020-05-18 10:26     ` Ian Kent
2020-05-18 10:39       ` Ian Kent

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