From 6d4d7ea9fc496db77f1bd09fc44f72f0ee9bd61a Mon Sep 17 00:00:00 2001 From: yangsheng Date: Wed, 11 Mar 2009 06:32:45 +0000 Subject: [PATCH] Branch b1_8 b=17701 i=adilger, nathan Reconsider the lov_getstripe works in BIG-Endian. --- lustre/include/lustre/lustre_user.h | 5 ---- lustre/lov/lov_pack.c | 49 ++++++++++++++++++++++++++++--------- 2 files changed, 38 insertions(+), 16 deletions(-) diff --git a/lustre/include/lustre/lustre_user.h b/lustre/include/lustre/lustre_user.h index afbcd33..4dfafcd 100644 --- a/lustre/include/lustre/lustre_user.h +++ b/lustre/include/lustre/lustre_user.h @@ -169,11 +169,6 @@ struct lov_user_md_v3 { /* LOV EA user data (host-endian) */ struct lov_user_ost_data_v1 lmm_objects[0]; /* per-stripe data */ } __attribute__((packed)); -#define copy_lov_mds2user(user_md, mds_md) do { \ - memcpy(user_md, mds_md, sizeof(*(user_md))); \ - (user_md)->lmm_stripe_offset = 0; \ - (user_md)->lmm_stripe_count = (mds_md)->lmm_stripe_count; } while(0) - /* Compile with -D_LARGEFILE64_SOURCE or -D_GNU_SOURCE (or #define) to * use this. It is unsafe to #define those values in this header as it * is possible the application has already #included . */ diff --git a/lustre/lov/lov_pack.c b/lustre/lov/lov_pack.c index 9d15b1a..3379a2f 100644 --- a/lustre/lov/lov_pack.c +++ b/lustre/lov/lov_pack.c @@ -596,6 +596,13 @@ int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm, (lum.lmm_magic != LOV_USER_MAGIC_V3)) RETURN(-EINVAL); + if (lum.lmm_stripe_count && + (lum.lmm_stripe_count < lsm->lsm_stripe_count)) { + /* Return right size of stripe to user */ + lum.lmm_stripe_count = lsm->lsm_stripe_count; + rc = copy_to_user(lump, &lum, lum_size); + RETURN(-EOVERFLOW); + } rc = lov_packmd(exp, &lmmk, lsm); if (rc < 0) RETURN(rc); @@ -608,20 +615,40 @@ int lov_getstripe(struct obd_export *exp, struct lov_stripe_md *lsm, LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lmmk->lmm_objects[0])); if ((cpu_to_le32(LOV_MAGIC) != LOV_MAGIC) && - (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC))) + ((lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1)) || + (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)))) { lustre_swab_lov_mds_md(lmmk); - /* User wasn't expecting this many OST entries */ - if (lum.lmm_stripe_count == 0) { - copy_lov_mds2user(&lum, lmmk); - if (copy_to_user(lump, &lum, lum_size)) - rc = -EFAULT; - } else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count) { - rc = -EOVERFLOW; + lustre_swab_lov_user_md_objects( + (struct lov_user_ost_data*)lmmk->lmm_objects, + lmmk->lmm_stripe_count); + } + if (lum.lmm_magic == LOV_USER_MAGIC) { + /* User request for v1, we need skip lmm_pool_name */ + if (lmmk->lmm_magic == LOV_MAGIC_V3) { + memmove((char*)(&lmmk->lmm_stripe_count) + + sizeof(lmmk->lmm_stripe_count), + lmmk->lmm_objects, lmmk->lmm_stripe_count * + sizeof(struct lov_ost_data_v1)); + lmm_size -= LOV_MAXPOOLNAME; + } } else { - copy_lov_mds2user(&lum, lmmk); - if (copy_to_user(lump, &lum, lmm_size)) - rc = -EFAULT; + /* if v3 we just have to update the lum_size */ + lum_size = sizeof(struct lov_user_md_v3); } + /* User wasn't expecting this many OST entries */ + if (lum.lmm_stripe_count == 0) + lmm_size = lum_size; + else if (lum.lmm_stripe_count < lmmk->lmm_stripe_count) + RETURN(-EOVERFLOW); + /* + * Have a difference between lov_mds_md & lov_user_md. + * So we have to re-order the data before copy to user. + */ + lum.lmm_stripe_count = lmmk->lmm_stripe_count; + ((struct lov_user_md*)lmmk)->lmm_stripe_offset = 0; + ((struct lov_user_md*)lmmk)->lmm_stripe_count = lum.lmm_stripe_count; + if (copy_to_user(lump, lmmk, lmm_size)) + rc = -EFAULT; obd_free_diskmd(exp, &lmmk); -- 1.8.3.1