LU-4931 ladvise: Add feature of giving file access advices

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

diff --git a/lustre/include/lustre/lustre_user.h b/lustre/include/lustre/lustre_user.h
index ad5c17e..b6605b2 100644 (file)
--- a/lustre/include/lustre/lustre_user.h
+++ b/lustre/include/lustre/lustre_user.h
@@ -294,6 +294,7 @@ struct ll_futimes_3 {
 #define LL_IOC_MIGRATE                 _IOR('f', 247, int)
 #define LL_IOC_FID2MDTIDX              _IOWR('f', 248, struct lu_fid)
 #define LL_IOC_GETPARENT               _IOWR('f', 249, struct getparent)
+#define LL_IOC_LADVISE                 _IOR('f', 250, struct lu_ladvise)
 
 /* Lease types for use as arg and return of LL_IOC_{GET,SET}_LEASE ioctl. */
 enum ll_lease_type {
@@ -1389,6 +1390,38 @@ struct llapi_json_item_list {
        struct llapi_json_item  *ljil_items;
 };
 
+enum lu_ladvise_type {
+       LU_LADVISE_INVALID      = 0,
+};
+
+#define LU_LADVISE_NAMES {                                             \
+}
+
+struct lu_ladvise {
+       __u64 lla_advice;
+       __u64 lla_start;
+       __u64 lla_end;
+       __u64 lla_padding;
+};
+
+enum ladvise_flag {
+       LF_ASYNC        = 0x00000001,
+};
+
+#define LADVISE_MAGIC 0x1ADF1CE0
+#define LF_MASK LF_ASYNC
+
+struct ladvise_hdr {
+       __u32                   lah_magic;      /* LADVISE_MAGIC */
+       __u32                   lah_count;      /* number of advices */
+       __u64                   lah_flags;      /* from enum ladvise_flag */
+       __u64                   lah_padding1;   /* unused */
+       __u64                   lah_padding2;   /* unused */
+       struct lu_ladvise       lah_advise[0];
+};
+
+#define LAH_COUNT_MAX  (1024)
+
 /** @} lustreuser */
 
 #endif /* _LUSTRE_USER_H */