A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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block: never take page references for ITER_BVEC

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If we pass pages through an iov_iter we always already have a reference
in the caller.  Thus remove the ITER_BVEC_FLAG_NO_REF and don't take
reference to pages by default for bvec backed iov_iters.

Reviewed-by: Minwoo Im <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-06-26 15:49:28 +02:00 • committed by Jens Axboe
commit b620743077
4 changed files with 6 additions and 37 deletions
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16
drivers/block/loop.c
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@ -264,20 +264,12 @@ lo_do_transfer(struct loop_device *lo, int cmd,
return ret;
}
static inline void loop_iov_iter_bvec(struct iov_iter *i,
unsigned int direction, const struct bio_vec *bvec,
unsigned long nr_segs, size_t count)
{
iov_iter_bvec(i, direction, bvec, nr_segs, count);
i->type |= ITER_BVEC_FLAG_NO_REF;
}
static int lo_write_bvec(struct file *file, struct bio_vec *bvec, loff_t *ppos)
{
struct iov_iter i;
ssize_t bw;
loop_iov_iter_bvec(&i, WRITE, bvec, 1, bvec->bv_len);
iov_iter_bvec(&i, WRITE, bvec, 1, bvec->bv_len);
file_start_write(file);
bw = vfs_iter_write(file, &i, ppos, 0);
@ -355,7 +347,7 @@ static int lo_read_simple(struct loop_device *lo, struct request *rq,
ssize_t len;
rq_for_each_segment(bvec, rq, iter) {
loop_iov_iter_bvec(&i, READ, &bvec, 1, bvec.bv_len);
iov_iter_bvec(&i, READ, &bvec, 1, bvec.bv_len);
len = vfs_iter_read(lo->lo_backing_file, &i, &pos, 0);
if (len < 0)
return len;
@ -396,7 +388,7 @@ static int lo_read_transfer(struct loop_device *lo, struct request *rq,
b.bv_offset = 0;
b.bv_len = bvec.bv_len;
loop_iov_iter_bvec(&i, READ, &b, 1, b.bv_len);
iov_iter_bvec(&i, READ, &b, 1, b.bv_len);
len = vfs_iter_read(lo->lo_backing_file, &i, &pos, 0);
if (len < 0) {
ret = len;
@ -563,7 +555,7 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
}
atomic_set(&cmd->ref, 2);
loop_iov_iter_bvec(&iter, rw, bvec, nr_bvec, blk_rq_bytes(rq));
iov_iter_bvec(&iter, rw, bvec, nr_bvec, blk_rq_bytes(rq));
iter.iov_offset = offset;
cmd->iocb.ki_pos = pos;