From: ira.weiny@intel.com
To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
"Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Ira Weiny <ira.weiny@intel.com>,
Al Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.cz>,
Dan Williams <dan.j.williams@intel.com>,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@lst.de>,
"Theodore Y. Ts'o" <tytso@mit.edu>,
Jeff Moyer <jmoyer@redhat.com>,
linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH V9 09/11] fs: Introduce DCACHE_DONTCACHE
Date: Tue, 21 Apr 2020 12:17:51 -0700 [thread overview]
Message-ID: <20200421191754.3372370-10-ira.weiny@intel.com> (raw)
In-Reply-To: <20200421191754.3372370-1-ira.weiny@intel.com>
From: Ira Weiny <ira.weiny@intel.com>
DCACHE_DONTCACHE indicates a dentry should not be cached on final
dput().
Also add a helper function to mark DCACHE_DONTCACHE on all dentries
pointing to a specific inode when that inode is being set I_DONTCACHE.
This facilitates dropping dentry references to inodes sooner which
require eviction to swap S_DAX mode.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
Changes from V8:
Update commit message
Use mark_inode_dontcache in XFS
Fix locking... can't use rcu here.
Change name to mark_inode_dontcache
---
fs/dcache.c | 4 ++++
fs/inode.c | 15 +++++++++++++++
fs/xfs/xfs_icache.c | 2 +-
include/linux/dcache.h | 2 ++
include/linux/fs.h | 1 +
5 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index b280e07e162b..0030fabab2c4 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -647,6 +647,10 @@ static inline bool retain_dentry(struct dentry *dentry)
if (dentry->d_op->d_delete(dentry))
return false;
}
+
+ if (unlikely(dentry->d_flags & DCACHE_DONTCACHE))
+ return false;
+
/* retain; LRU fodder */
dentry->d_lockref.count--;
if (unlikely(!(dentry->d_flags & DCACHE_LRU_LIST)))
diff --git a/fs/inode.c b/fs/inode.c
index 93d9252a00ab..da7f3c4926cd 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1526,6 +1526,21 @@ int generic_delete_inode(struct inode *inode)
}
EXPORT_SYMBOL(generic_delete_inode);
+void mark_inode_dontcache(struct inode *inode)
+{
+ struct dentry *de;
+
+ spin_lock(&inode->i_lock);
+ hlist_for_each_entry(de, &inode->i_dentry, d_u.d_alias) {
+ spin_lock(&de->d_lock);
+ de->d_flags |= DCACHE_DONTCACHE;
+ spin_unlock(&de->d_lock);
+ }
+ spin_unlock(&inode->i_lock);
+ inode->i_state |= I_DONTCACHE;
+}
+EXPORT_SYMBOL(mark_inode_dontcache);
+
/*
* Called when we're dropping the last reference
* to an inode.
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index de76f7f60695..3c8f44477804 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -559,7 +559,7 @@ xfs_iget_cache_miss(
*/
iflags = XFS_INEW;
if (flags & XFS_IGET_DONTCACHE)
- VFS_I(ip)->i_state |= I_DONTCACHE;
+ mark_inode_dontcache(VFS_I(ip));
ip->i_udquot = NULL;
ip->i_gdquot = NULL;
ip->i_pdquot = NULL;
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index c1488cc84fd9..56b1482d9223 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -177,6 +177,8 @@ struct dentry_operations {
#define DCACHE_REFERENCED 0x00000040 /* Recently used, don't discard. */
+#define DCACHE_DONTCACHE 0x00000080 /* don't cache on final dput() */
+
#define DCACHE_CANT_MOUNT 0x00000100
#define DCACHE_GENOCIDE 0x00000200
#define DCACHE_SHRINK_LIST 0x00000400
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 44bd45af760f..064168ec2e0b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3055,6 +3055,7 @@ static inline int generic_drop_inode(struct inode *inode)
return !inode->i_nlink || inode_unhashed(inode) ||
(inode->i_state & I_DONTCACHE);
}
+extern void mark_inode_dontcache(struct inode *inode);
extern struct inode *ilookup5_nowait(struct super_block *sb,
unsigned long hashval, int (*test)(struct inode *, void *),
--
2.25.1
next prev parent reply other threads:[~2020-04-21 19:18 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-21 19:17 [PATCH V9 00/11] XFS - Enable per-file/per-directory DAX operations V9 ira.weiny
2020-04-21 19:17 ` [PATCH V9 01/11] fs/xfs: Remove unnecessary initialization of i_rwsem ira.weiny
2020-04-21 19:17 ` [PATCH V9 02/11] fs: Remove unneeded IS_DAX() check in io_is_direct() ira.weiny
2020-04-21 20:13 ` Darrick J. Wong
2020-04-22 8:37 ` Jan Kara
2020-04-21 19:17 ` [PATCH V9 03/11] fs/stat: Define DAX statx attribute ira.weiny
2020-04-22 16:29 ` Darrick J. Wong
2020-04-22 18:51 ` Ira Weiny
2020-04-23 8:24 ` Jan Kara
2020-04-21 19:17 ` [PATCH V9 04/11] fs/xfs: Change XFS_MOUNT_DAX to XFS_MOUNT_DAX_ALWAYS ira.weiny
2020-04-21 19:17 ` [PATCH V9 05/11] fs/xfs: Make DAX mount option a tri-state ira.weiny
2020-04-21 20:16 ` Darrick J. Wong
2020-04-21 21:06 ` Ira Weiny
2020-04-21 19:17 ` [PATCH V9 06/11] fs/xfs: Create function xfs_inode_should_enable_dax() ira.weiny
2020-04-21 19:17 ` [PATCH V9 07/11] fs/xfs: Combine xfs_diflags_to_linux() and xfs_diflags_to_iflags() ira.weiny
2020-04-21 19:17 ` [PATCH V9 08/11] fs: Lift XFS_IDONTCACNE to the VFS layer ira.weiny
2020-04-21 20:23 ` Darrick J. Wong
2020-04-21 21:12 ` Ira Weiny
2020-04-22 8:41 ` Jan Kara
2020-04-21 19:17 ` ira.weiny [this message]
2020-04-21 20:25 ` [PATCH V9 09/11] fs: Introduce DCACHE_DONTCACHE Darrick J. Wong
2020-04-21 21:15 ` Ira Weiny
2020-04-22 2:34 ` Al Viro
2020-04-22 3:46 ` Ira Weiny
2020-04-22 8:46 ` Jan Kara
2020-04-22 15:19 ` Ira Weiny
2020-04-21 19:17 ` [PATCH V9 10/11] fs/xfs: Update xfs_ioctl_setattr_dax_invalidate() ira.weiny
2020-04-21 20:31 ` Darrick J. Wong
2020-04-21 21:30 ` Dave Chinner
2020-04-21 21:43 ` Ira Weiny
2020-04-21 23:13 ` Dave Chinner
2020-04-21 23:24 ` Ira Weiny
2020-04-21 19:17 ` [PATCH V9 11/11] Documentation/dax: Update Usage section ira.weiny
2020-04-21 20:34 ` Darrick J. Wong
2020-04-21 21:49 ` Ira Weiny
2020-04-22 9:47 ` Jan Kara
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