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scoutfs: warn if we try IO outside the device

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We've had bugs in allocators that return success and crazy block
numbers.   The bad block numbers eventually make their way down to the
context-free kernel warning that IO was attempted outside the device.
This at least gives us a stack trace to help find where it's coming
from.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2018-06-29 14:42:06 -07:00
committed by Zach Brown
parent 2efba47b77
commit 876414065b
1 changed files with 7 additions and 0 deletions
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kmod/src/bio.c
+7
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@@ -69,6 +69,7 @@ void scoutfs_bio_submit(struct super_block *sb, int rw, struct page **pages,
{
unsigned int nr_pages = DIV_ROUND_UP(nr_blocks,
SCOUTFS_BLOCKS_PER_PAGE);
struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
struct bio_end_io_args *args;
struct blk_plug plug;
unsigned int bytes;
@@ -77,6 +78,12 @@ void scoutfs_bio_submit(struct super_block *sb, int rw, struct page **pages,
int ret = 0;
int i;
if (super->total_blocks &&
WARN_ON_ONCE(blkno >= le64_to_cpu(super->total_blocks))) {
end_io(sb, data, -EIO);
return;
}
args = kmalloc(sizeof(struct bio_end_io_args), GFP_NOFS);
if (!args) {
end_io(sb, data, -ENOMEM);