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
next reply other threads:[~2020-05-15 7:22 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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