| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1593974870-18919-3-git-send-email-joshi.k@samsung.com>
Date: Mon, 6 Jul 2020 00:17:48 +0530
From: Kanchan Joshi <joshi.k@...sung.com>
To: axboe@...nel.dk, viro@...iv.linux.org.uk, bcrl@...ck.org
Cc: hch@...radead.org, Damien.LeMoal@....com, asml.silence@...il.com,
linux-fsdevel@...r.kernel.org, mb@...htnvm.io,
linux-kernel@...r.kernel.org, linux-aio@...ck.org,
io-uring@...r.kernel.org, linux-block@...r.kernel.org,
Selvakumar S <selvakuma.s1@...sung.com>,
Kanchan Joshi <joshi.k@...sung.com>,
Nitesh Shetty <nj.shetty@...sung.com>,
Arnav Dawn <a.dawn@...sung.com>,
Javier Gonzalez <javier.gonz@...sung.com>
Subject: [PATCH v3 2/4] block: add zone append handling for direct I/O path
From: Selvakumar S <selvakuma.s1@...sung.com>
For zoned block device, subscribe to zone-append by setting
FMODE_ZONE_APPEND during open. Make direct IO submission path use
IOCB_ZONE_APPEND to send bio with append op. Make direct IO completion
return zone-relative offset, in sector unit, to upper layer using
kiocb->ki_complete interface.
Return failure if write is larger than max_append_limit and therefore
requires formation of multiple bios.
Signed-off-by: Selvakumar S <selvakuma.s1@...sung.com>
Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@...sung.com>
Signed-off-by: Arnav Dawn <a.dawn@...sung.com>
Signed-off-by: Javier Gonzalez <javier.gonz@...sung.com>
---
fs/block_dev.c | 49 ++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 40 insertions(+), 9 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 47860e5..941fb22 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -178,10 +178,19 @@ static struct inode *bdev_file_inode(struct file *file)
return file->f_mapping->host;
}
-static unsigned int dio_bio_write_op(struct kiocb *iocb)
+static unsigned int dio_bio_op(bool is_read, struct kiocb *iocb)
{
- unsigned int op = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE;
+ unsigned int op;
+ if (is_read)
+ return REQ_OP_READ;
+
+ if (iocb->ki_flags & IOCB_ZONE_APPEND)
+ op = REQ_OP_ZONE_APPEND;
+ else
+ op = REQ_OP_WRITE;
+
+ op |= REQ_SYNC | REQ_IDLE;
/* avoid the need for a I/O completion work item */
if (iocb->ki_flags & IOCB_DSYNC)
op |= REQ_FUA;
@@ -207,6 +216,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
struct bio_vec inline_vecs[DIO_INLINE_BIO_VECS], *vecs;
loff_t pos = iocb->ki_pos;
bool should_dirty = false;
+ bool is_read = (iov_iter_rw(iter) == READ);
struct bio bio;
ssize_t ret;
blk_qc_t qc;
@@ -231,18 +241,17 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
bio.bi_private = current;
bio.bi_end_io = blkdev_bio_end_io_simple;
bio.bi_ioprio = iocb->ki_ioprio;
+ bio.bi_opf = dio_bio_op(is_read, iocb);
ret = bio_iov_iter_get_pages(&bio, iter);
if (unlikely(ret))
goto out;
ret = bio.bi_iter.bi_size;
- if (iov_iter_rw(iter) == READ) {
- bio.bi_opf = REQ_OP_READ;
+ if (is_read) {
if (iter_is_iovec(iter))
should_dirty = true;
} else {
- bio.bi_opf = dio_bio_write_op(iocb);
task_io_account_write(ret);
}
if (iocb->ki_flags & IOCB_HIPRI)
@@ -295,6 +304,16 @@ static int blkdev_iopoll(struct kiocb *kiocb, bool wait)
return blk_poll(q, READ_ONCE(kiocb->ki_cookie), wait);
}
+static inline long blkdev_bio_res2(struct kiocb *iocb, struct bio *bio)
+{
+ /* calculate zone relative offset for zone append */
+ if (op_is_write(bio_op(bio)) && iocb->ki_flags & IOCB_ZONE_APPEND) {
+ sector_t zone_sec = blk_queue_zone_sectors(bio->bi_disk->queue);
+ return bio->bi_iter.bi_sector & (zone_sec - 1);
+ }
+ return 0;
+}
+
static void blkdev_bio_end_io(struct bio *bio)
{
struct blkdev_dio *dio = bio->bi_private;
@@ -307,15 +326,17 @@ static void blkdev_bio_end_io(struct bio *bio)
if (!dio->is_sync) {
struct kiocb *iocb = dio->iocb;
ssize_t ret;
+ long res2;
if (likely(!dio->bio.bi_status)) {
ret = dio->size;
iocb->ki_pos += ret;
+ res2 = blkdev_bio_res2(iocb, bio);
} else {
ret = blk_status_to_errno(dio->bio.bi_status);
}
- dio->iocb->ki_complete(iocb, ret, 0);
+ dio->iocb->ki_complete(iocb, ret, res2);
if (dio->multi_bio)
bio_put(&dio->bio);
} else {
@@ -382,6 +403,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
bio->bi_private = dio;
bio->bi_end_io = blkdev_bio_end_io;
bio->bi_ioprio = iocb->ki_ioprio;
+ bio->bi_opf = dio_bio_op(is_read, iocb);
ret = bio_iov_iter_get_pages(bio, iter);
if (unlikely(ret)) {
@@ -391,11 +413,9 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
}
if (is_read) {
- bio->bi_opf = REQ_OP_READ;
if (dio->should_dirty)
bio_set_pages_dirty(bio);
} else {
- bio->bi_opf = dio_bio_write_op(iocb);
task_io_account_write(bio->bi_iter.bi_size);
}
@@ -419,6 +439,12 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
}
if (!dio->multi_bio) {
+ /* zone-append cannot work with multi bio*/
+ if (!is_read && iocb->ki_flags & IOCB_ZONE_APPEND) {
+ bio->bi_status = BLK_STS_IOERR;
+ bio_endio(bio);
+ break;
+ }
/*
* AIO needs an extra reference to ensure the dio
* structure which is embedded into the first bio
@@ -1841,6 +1867,7 @@ EXPORT_SYMBOL(blkdev_get_by_dev);
static int blkdev_open(struct inode * inode, struct file * filp)
{
struct block_device *bdev;
+ int ret;
/*
* Preserve backwards compatibility and allow large file access
@@ -1866,7 +1893,11 @@ static int blkdev_open(struct inode * inode, struct file * filp)
filp->f_mapping = bdev->bd_inode->i_mapping;
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
- return blkdev_get(bdev, filp->f_mode, filp);
+ ret = blkdev_get(bdev, filp->f_mode, filp);
+ if (blk_queue_is_zoned(bdev->bd_disk->queue))
+ filp->f_mode |= FMODE_ZONE_APPEND;
+
+ return ret;
}
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
--
2.7.4
Powered by blists - more mailing lists