diff options
| author | Ira Weiny | 2020-04-30 07:41:37 -0700 |
|---|---|---|
| committer | Darrick J. Wong | 2020-05-13 08:44:35 -0700 |
| commit | 2c567af418e3f9380c2051aada58b4e5a4b5c2ad (patch) | |
| tree | 8b5c7c07983cd102b7ce5e41858fb6f90e284258 /fs/dcache.c | |
| parent | dae2f8ed7992e88c8d62c54e8295ffc8475b4a80 (diff) | |
fs: Introduce DCACHE_DONTCACHE
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>
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index b280e07e162b..0d07fb335b78 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))) @@ -656,6 +660,21 @@ static inline bool retain_dentry(struct dentry *dentry) return true; } +void d_mark_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); + } + inode->i_state |= I_DONTCACHE; + spin_unlock(&inode->i_lock); +} +EXPORT_SYMBOL(d_mark_dontcache); + /* * Finish off a dentry we've decided to kill. * dentry->d_lock must be held, returns with it unlocked. |