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Date: Thu, 27 Oct 2016 18:11:47 -0400 From: James Simmons <jsimmons@...radead.org> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, devel@...verdev.osuosl.org, Andreas Dilger <andreas.dilger@...el.com>, Oleg Drokin <oleg.drokin@...el.com> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Lustre Development List <lustre-devel@...ts.lustre.org>, wang di <di.wang@...el.com>, James Simmons <jsimmons@...radead.org> Subject: [PATCH 13/29] staging: lustre: llite: report back to user bad stripe count From: wang di <di.wang@...el.com> 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@...el.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@...el.com> Reviewed-by: James Simmons <uja.ornl@...oo.com> Reviewed-by: Oleg Drokin <oleg.drokin@...el.com> Signed-off-by: James Simmons <jsimmons@...radead.org> --- drivers/staging/lustre/lustre/llite/dir.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c index fb367ae..64a32d5 100644 --- a/drivers/staging/lustre/lustre/llite/dir.c +++ b/drivers/staging/lustre/lustre/llite/dir.c @@ -1195,6 +1195,7 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 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 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 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 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg) } 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) { -- 1.7.1
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