LU-2139 osc: Track and limit "unstable" pages

[fs/lustre-release.git] / lustre / include / lclient.h

diff --git a/lustre/include/lclient.h b/lustre/include/lclient.h
index 93169c7..3d404f6 100644 (file)
--- a/lustre/include/lclient.h
+++ b/lustre/include/lclient.h
@@ -434,8 +434,10 @@ struct lov_stripe_md *ccc_inode_lsm_get(struct inode *inode);
 void ccc_inode_lsm_put(struct inode *inode, struct lov_stripe_md *lsm);
 
 /**
- * Data structure managing a client's cached clean pages. An LRU of
- * pages is maintained, along with other statistics.
+ * Data structure managing a client's cached pages. A count of
+ * "unstable" pages is maintained, and an LRU of clean pages is
+ * maintained. "unstable" pages are pages pinned by the ptlrpc
+ * layer for recovery purposes.
  */
 struct cl_client_cache {
        cfs_atomic_t    ccc_users;    /* # of users (OSCs) of this data */
@@ -444,6 +446,8 @@ struct cl_client_cache {
        cfs_atomic_t    ccc_lru_left; /* # of LRU entries available */
        unsigned long   ccc_lru_max;  /* Max # of LRU entries possible */
        unsigned int    ccc_lru_shrinkers; /* # of threads reclaiming */
+       cfs_atomic_t    ccc_unstable_nr;    /* # of unstable pages pinned */
+       cfs_waitq_t     ccc_unstable_waitq; /* Signaled on BRW commit */
 };
 
 #endif /*LCLIENT_H */