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fs: Introduce DCACHE_DONTCACHE

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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>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Ira Weiny
2020-04-30 07:41:37 -07:00
committed by Darrick J. Wong
parent dae2f8ed79
commit 2c567af418
4 changed files with 23 additions and 1 deletions
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2
include/linux/dcache.h
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@@ -177,6 +177,8 @@ struct dentry_operations {
#define DCACHE_REFERENCED 0x00000040 /* Recently used, don't discard. */
#define DCACHE_DONTCACHE 0x00000080 /* Purge from memory on final dput() */
#define DCACHE_CANT_MOUNT 0x00000100
#define DCACHE_GENOCIDE 0x00000200
#define DCACHE_SHRINK_LIST 0x00000400