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authorSage Weil <sage@newdream.net>2011-10-28 21:02:42 +0400
committerChristoph Hellwig <hch@serles.lst.de>2011-11-02 15:53:43 +0400
commitf0023bc617ba600956b9226f1806033d7486c8ba (patch)
tree7a5ad7481b160e1d40cdc95626bfdb5e8577c88e /Documentation/filesystems
parenta78ef704a8dd430225955f0709b22d4a6ba21deb (diff)
downloadlinux-f0023bc617ba600956b9226f1806033d7486c8ba.tar.xz
vfs: add d_prune dentry operation
This adds a d_prune dentry operation that is called by the VFS prior to pruning (i.e. unhashing and killing) a hashed dentry from the dcache. Wrap dentry_lru_del() and use the new _prune() helper in the cases where we are about to unhash and kill the dentry. This will be used by Ceph to maintain a flag indicating whether the complete contents of a directory are contained in the dcache, allowing it to satisfy lookups and readdir without addition server communication. Renumber a few DCACHE_* #defines to group DCACHE_OP_PRUNE with the other DCACHE_OP_ bits. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/Locking1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 653380793a6c..d819ba16a0c7 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -29,6 +29,7 @@ d_hash no no no maybe
d_compare: yes no no maybe
d_delete: no yes no no
d_release: no no yes no
+d_prune: no yes no no
d_iput: no no yes no
d_dname: no no no no
d_automount: no no yes no