From: ira.weiny@intel.com
To: linux-kernel@vger.kernel.org,
"Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Ira Weiny <ira.weiny@intel.com>, 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-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: [PATCH V8 09/11] fs: Introduce DCACHE_DONTCACHE
Date: Tue, 14 Apr 2020 23:45:21 -0700 [thread overview]
Message-ID: <20200415064523.2244712-10-ira.weiny@intel.com> (raw)
In-Reply-To: <20200415064523.2244712-1-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 which will flag I_DONTCACHE as well ad
DCACHE_DONTCACHE on all dentries point to a specified inode.
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
Changes from V7:
new patch
---
fs/dcache.c | 4 ++++
fs/inode.c | 15 +++++++++++++++
include/linux/dcache.h | 2 ++
include/linux/fs.h | 1 +
4 files changed, 22 insertions(+)
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..b8b1917a324e 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 flag_inode_dontcache(struct inode *inode)
+{
+ struct dentry *dent;
+
+ rcu_read_lock();
+ hlist_for_each_entry(dent, &inode->i_dentry, d_u.d_alias) {
+ spin_lock(&dent->d_lock);
+ dent->d_flags |= DCACHE_DONTCACHE;
+ spin_unlock(&dent->d_lock);
+ }
+ rcu_read_unlock();
+ inode->i_state |= I_DONTCACHE;
+}
+EXPORT_SYMBOL(flag_inode_dontcache);
+
/*
* Called when we're dropping the last reference
* to an inode.
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 e2db71d150c3..f2916c99616a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3048,6 +3048,7 @@ static inline int generic_drop_inode(struct inode *inode)
return !inode->i_nlink || inode_unhashed(inode) ||
(inode->i_state & I_DONTCACHE);
}
+extern void flag_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:[~2020-04-15 6:47 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-15 6:45 [PATCH V8 00/11] Enable per-file/per-directory DAX operations V8 ira.weiny
2020-04-15 6:45 ` [PATCH V8 01/11] fs/xfs: Remove unnecessary initialization of i_rwsem ira.weiny
2020-04-15 15:12 ` Darrick J. Wong
2020-04-15 6:45 ` [PATCH V8 02/11] fs: Remove unneeded IS_DAX() check in io_is_direct() ira.weiny
2020-04-15 6:45 ` [PATCH V8 03/11] fs/stat: Define DAX statx attribute ira.weiny
2020-04-15 6:45 ` [PATCH V8 04/11] fs/xfs: Change XFS_MOUNT_DAX to XFS_MOUNT_DAX_ALWAYS ira.weiny
2020-04-15 15:11 ` Darrick J. Wong
2020-04-20 2:15 ` Dave Chinner
2020-04-20 17:50 ` Ira Weiny
2020-04-15 6:45 ` [PATCH V8 05/11] fs/xfs: Make DAX mount option a tri-state ira.weiny
2020-04-15 15:16 ` Darrick J. Wong
2020-04-16 4:15 ` Ira Weiny
2020-04-15 6:45 ` [PATCH V8 06/11] fs/xfs: Create function xfs_inode_enable_dax() ira.weiny
2020-04-15 15:17 ` Darrick J. Wong
2020-04-15 6:45 ` [PATCH V8 07/11] fs/xfs: Combine xfs_diflags_to_linux() and xfs_diflags_to_iflags() ira.weiny
2020-04-15 6:45 ` [PATCH V8 08/11] fs: Define I_DONTCACNE in VFS layer ira.weiny
2020-04-15 8:52 ` Jan Kara
2020-04-15 15:18 ` Darrick J. Wong
2020-04-16 4:28 ` Ira Weiny
2020-04-16 4:28 ` Ira Weiny
2020-04-15 6:45 ` ira.weiny [this message]
2020-04-15 9:01 ` [PATCH V8 09/11] fs: Introduce DCACHE_DONTCACHE Jan Kara
2020-04-16 4:55 ` Ira Weiny
2020-04-15 6:45 ` [PATCH V8 10/11] fs/xfs: Change xfs_ioctl_setattr_dax_invalidate() ira.weiny
2020-04-15 15:21 ` Darrick J. Wong
2020-04-16 5:00 ` Ira Weiny
2020-04-20 2:31 ` Dave Chinner
2020-04-20 18:36 ` Ira Weiny
2020-04-21 0:19 ` Dave Chinner
2020-04-15 6:45 ` [PATCH V8 11/11] Documentation/dax: Update Usage section ira.weiny
2020-04-15 15:29 ` Darrick J. Wong
2020-04-16 5:36 ` Ira Weiny
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