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staging: lustre: llite: report back to user bad stripe count

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If the user is requesting a stripe count larger than what
is supported in the file system then report back to the
user an error as well as what is the largest possible
striping.

Signed-off-by: wang di <di.wang@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6602
Reviewed-on: http://review.whamcloud.com/15162
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
wang di 2016-10-27 18:11:47 -04:00 committed by Greg Kroah-Hartman
parent 51cfb8c43b
commit d1fc93b730
1 changed files with 12 additions and 0 deletions
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12
drivers/staging/lustre/lustre/llite/dir.c
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@ -1195,6 +1195,7 @@ lmv_out_free:
struct lmv_user_md *tmp = NULL;
union lmv_mds_md *lmm = NULL;
u64 valid = 0;
int max_stripe_count;
int stripe_count;
int mdt_index;
int lum_size;
@ -1206,6 +1207,7 @@ lmv_out_free:
if (copy_from_user(&lum, ulmv, sizeof(*ulmv)))
return -EFAULT;
max_stripe_count = lum.lum_stripe_count;
/*
* lum_magic will indicate which stripe the ioctl will like
* to get, LMV_MAGIC_V1 is for normal LMV stripe, LMV_USER_MAGIC
@ -1240,6 +1242,16 @@ lmv_out_free:
}
stripe_count = lmv_mds_md_stripe_count_get(lmm);
if (max_stripe_count < stripe_count) {
lum.lum_stripe_count = stripe_count;
if (copy_to_user(ulmv, &lum, sizeof(lum))) {
rc = -EFAULT;
goto finish_req;
}
rc = -E2BIG;
goto finish_req;
}
lum_size = lmv_user_md_size(stripe_count, LMV_MAGIC_V1);
tmp = kzalloc(lum_size, GFP_NOFS);
if (!tmp) {