From d1a118ae4b131e27081dddabbaa77c52080f89fa Mon Sep 17 00:00:00 2001 From: Qian Yingjin Date: Tue, 1 Dec 2020 16:22:08 +0800 Subject: [PATCH] LU-13602 pcc: add LCM_FL_PCC_RDONLY layout flag The upcoming new feature PCC-RO is combined with FLR and extend the on-disk data strucutre 'enum lov_comp_md_flags' for layout components. It adds a new layout flag: LCM_FL_PCC_RDONLY. enum lov_comp_md_flags { LCM_FL_NONE = 0x0, LCM_FL_RDONLY = 0x1, LCM_FL_WRITE_PENDING = 0x2, LCM_FL_SYNC_PENDING = 0x3, LCM_FL_PCC_RDONLY = 0x8, LCM_FL_FLR_MASK = 0xB, }; The LCM_FL_PCC_RDONLY flag, which is dedicated for PCC-RO, is different from LCM_FL_RDONLY. A PCC-RO cached file could be in the state: - LCM_FL_PCC_RDONLY | LCM_FL_RDONLY: it means that all FLR components are synced and in up-to-date state. The replicated file is on read-only state. And then one client attaches the file into the PCC backend with PCC-RO mode. - LCM_FL_PCC_RDONLY | LCM_FL_WRITE_PENDING: it means the file was once modified, the data content of layout components are not synced. MDT has already picked a promary replica and marked other components as STALE. At this time, a client can still PCC-RO attach the file. On this client, the primary component and the PCC copy are both in up-to-date state. As a new LCM_FL_PCC_RDONLY flag is added, the old client may not understand this new FLR layout flag, and may result in inconsistent data access. This patch adds this new flag for the purpose of compatibility and interoperability. Test-Parameters: trivial Signed-off-by: Qian Yingjin Change-Id: I2e96f413c0b35355503c20dfea0a39d39a216d90 --- lustre/include/uapi/linux/lustre/lustre_user.h | 13 +++++++------ lustre/lod/lod_internal.h | 2 +- lustre/ptlrpc/wiretest.c | 2 ++ lustre/utils/wiretest.c | 2 ++ 4 files changed, 12 insertions(+), 7 deletions(-) diff --git a/lustre/include/uapi/linux/lustre/lustre_user.h b/lustre/include/uapi/linux/lustre/lustre_user.h index 0bf5480..40a7e5a 100644 --- a/lustre/include/uapi/linux/lustre/lustre_user.h +++ b/lustre/include/uapi/linux/lustre/lustre_user.h @@ -931,12 +931,13 @@ static inline __u16 mirror_id_of(__u32 id) * on-disk data for lcm_flags. Valid if lcm_magic is LOV_MAGIC_COMP_V1. */ enum lov_comp_md_flags { - /* the least 2 bits are used by FLR to record file state */ - LCM_FL_NONE = 0, - LCM_FL_RDONLY = 1, - LCM_FL_WRITE_PENDING = 2, - LCM_FL_SYNC_PENDING = 3, - LCM_FL_FLR_MASK = 0x3, + /* the least 4 bits are used by FLR to record file state */ + LCM_FL_NONE = 0x0, + LCM_FL_RDONLY = 0x1, + LCM_FL_WRITE_PENDING = 0x2, + LCM_FL_SYNC_PENDING = 0x3, + LCM_FL_PCC_RDONLY = 0x8, + LCM_FL_FLR_MASK = 0xB, }; struct lov_comp_md_v1 { diff --git a/lustre/lod/lod_internal.h b/lustre/lod/lod_internal.h index 6140166..ae183d1 100644 --- a/lustre/lod/lod_internal.h +++ b/lustre/lod/lod_internal.h @@ -215,7 +215,7 @@ struct lod_object { __u16 ldo_mirror_count; struct lod_mirror_entry *ldo_mirrors; __u32 ldo_is_composite:1, - ldo_flr_state:2, + ldo_flr_state:4, ldo_comp_cached:1, ldo_is_foreign:1; }; diff --git a/lustre/ptlrpc/wiretest.c b/lustre/ptlrpc/wiretest.c index 25d2736..a297479 100644 --- a/lustre/ptlrpc/wiretest.c +++ b/lustre/ptlrpc/wiretest.c @@ -1860,6 +1860,8 @@ void lustre_assert_wire_constants(void) (long long)LCM_FL_WRITE_PENDING); LASSERTF(LCM_FL_SYNC_PENDING == 3, "found %lld\n", (long long)LCM_FL_SYNC_PENDING); + LASSERTF(LCM_FL_PCC_RDONLY == 8, "found %lld\n", + (long long)LCM_FL_PCC_RDONLY); /* Checks for struct lmv_mds_md_v1 */ LASSERTF((int)sizeof(struct lmv_mds_md_v1) == 56, "found %lld\n", diff --git a/lustre/utils/wiretest.c b/lustre/utils/wiretest.c index 85faa0b..2fa2adc 100644 --- a/lustre/utils/wiretest.c +++ b/lustre/utils/wiretest.c @@ -1892,6 +1892,8 @@ void lustre_assert_wire_constants(void) (long long)LCM_FL_WRITE_PENDING); LASSERTF(LCM_FL_SYNC_PENDING == 3, "found %lld\n", (long long)LCM_FL_SYNC_PENDING); + LASSERTF(LCM_FL_PCC_RDONLY == 8, "found %lld\n", + (long long)LCM_FL_PCC_RDONLY); /* Checks for struct lmv_mds_md_v1 */ LASSERTF((int)sizeof(struct lmv_mds_md_v1) == 56, "found %lld\n", -- 1.8.3.1