Commits
Chansol Kim committed 0503871223b
lightnvm: pblk: fix bio leak when bio is split
For large size io where blk_queue_split needs to be called inside
pblk_rw_io, results in bio leak as bio_endio is not called on the
newly allocated. One way to observe this is to mounting ext4
filesystem on the target and issuing 1MB io with dd, e.g., dd bs=1MB
if=/dev/null of=/mount/myvolume. kmemleak reports:
unreferenced object 0xffff88803d7d0100 (size 256):
comm "kworker/u16:1", pid 68, jiffies 4294899333 (age 284.120s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 60 e8 31 81 88 ff ff .........`.1....
01 40 00 00 06 06 00 00 00 00 00 00 05 00 00 00 .@..............
backtrace:
[<000000001f5aa04f>] kmem_cache_alloc+0x204/0x3c0
[<0000000040945aab>] mempool_alloc_slab+0x1d/0x30
[<00000000b4959ab4>] mempool_alloc+0x83/0x220
[<00000000646bad9b>] bio_alloc_bioset+0x229/0x320
[<000000009264b251>] bio_clone_fast+0x26/0xc0
[<0000000008250252>] bio_split+0x41/0x110
[<00000000e365cad0>] blk_queue_split+0x349/0x930
[<00000000eb5426bc>] pblk_make_rq+0x1b5/0x1f0
[<00000000eea09cec>] generic_make_request+0x2f9/0x690
[<00000000ae6acede>] submit_bio+0x12e/0x1f0
[<00000000f9b8b82a>] ext4_io_submit+0x64/0x80
[<000000009e4f817d>] ext4_bio_write_page+0x32e/0x890
[<00000000cbd0d106>] mpage_submit_page+0x65/0xc0
[<000000000eec7359>] mpage_map_and_submit_buffers+0x171/0x330
[<000000009a7afcb6>] ext4_writepages+0xd5e/0x1650
[<000000004476b096>] do_writepages+0x39/0xc0
In case there is a need for a split, blk_queue_split returns the newly
allocated bio to the caller by changing the value of pointer passed as
a reference, while the original is passed to generic_make_requests.
Although pblk_rw_io's local variable bio* has changed and passed to
pblk_submit_read and pblk_write_to_cache, work is done on this new
bio*, and pblk_rw_io returns NVM_IO_DONE, pblk_make_rq calls bio_endio
on the old bio* because it passed bio pointer by value to pblk_rw_io.
pblk_rw_io is unfolded into pblk_make_rq so that there is no copying
of bio* and bio_endio is called on the correct bio*.
Signed-off-by: Chansol Kim <chansol.kim@samsung.com>
Reviewed-by: Javier González <javier@javigon.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>