LU-13440 lmv: add default LMV inherit depth

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

diff --git a/lustre/include/uapi/linux/lustre/lustre_user.h b/lustre/include/uapi/linux/lustre/lustre_user.h
index 24867af..9297f0d 100644 (file)
--- a/lustre/include/uapi/linux/lustre/lustre_user.h
+++ b/lustre/include/uapi/linux/lustre/lustre_user.h
@@ -1086,12 +1086,14 @@ extern struct lustre_foreign_type lu_foreign_types[];
 #define LMV_MAX_STRIPE_COUNT 2000  /* ((12 * 4096 - 256) / 24) */
 #define lmv_user_md lmv_user_md_v1
 struct lmv_user_md_v1 {
-       __u32   lum_magic;       /* must be the first field */
+       __u32   lum_magic;         /* must be the first field */
        __u32   lum_stripe_count;  /* dirstripe count */
        __u32   lum_stripe_offset; /* MDT idx for default dirstripe */
        __u32   lum_hash_type;     /* Dir stripe policy */
-       __u32   lum_type;         /* LMV type: default */
-       __u32   lum_padding1;
+       __u32   lum_type;          /* LMV type: default */
+       __u8    lum_max_inherit;   /* inherit depth of default LMV */
+       __u8    lum_max_inherit_rr;     /* inherit depth of default LMV to round-robin mkdir */
+       __u16   lum_padding1;
        __u32   lum_padding2;
        __u32   lum_padding3;
        char    lum_pool_name[LOV_MAXPOOLNAME + 1];
@@ -1117,6 +1119,37 @@ enum lmv_type {
        LMV_TYPE_DEFAULT = 0x0000,
 };
 
+/* lum_max_inherit will be decreased by 1 after each inheritance if it's not
+ * LMV_INHERIT_UNLIMITED or > LMV_INHERIT_MAX.
+ */
+enum {
+       /* for historical reason, 0 means unlimited inheritance */
+       LMV_INHERIT_UNLIMITED   = 0,
+       /* unlimited lum_max_inherit by default */
+       LMV_INHERIT_DEFAULT     = 0,
+       /* not inherit any more */
+       LMV_INHERIT_END         = 1,
+       /* max inherit depth */
+       LMV_INHERIT_MAX         = 250,
+       /* [251, 254] are reserved */
+       /* not set, or when inherit depth goes beyond end,  */
+       LMV_INHERIT_NONE        = 255,
+};
+
+enum {
+       /* not set, or when inherit_rr depth goes beyond end,  */
+       LMV_INHERIT_RR_NONE             = 0,
+       /* disable lum_max_inherit_rr by default */
+       LMV_INHERIT_RR_DEFAULT          = 0,
+       /* not inherit any more */
+       LMV_INHERIT_RR_END              = 1,
+       /* max inherit depth */
+       LMV_INHERIT_RR_MAX              = 250,
+       /* [251, 254] are reserved */
+       /* unlimited inheritance */
+       LMV_INHERIT_RR_UNLIMITED        = 255,
+};
+
 static inline int lmv_user_md_size(int stripes, int lmm_magic)
 {
        int size = sizeof(struct lmv_user_md);