2021-09-07 14:13:02 +00:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
/*
|
|
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
|
|
* Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
|
|
|
|
* Copyright (C) 2016 - 2020 Christoph Hellwig
|
|
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/mm.h>
|
|
|
|
#include <linux/blkdev.h>
|
|
|
|
#include <linux/buffer_head.h>
|
|
|
|
#include <linux/mpage.h>
|
|
|
|
#include <linux/uio.h>
|
|
|
|
#include <linux/namei.h>
|
|
|
|
#include <linux/task_io_accounting_ops.h>
|
|
|
|
#include <linux/falloc.h>
|
|
|
|
#include <linux/suspend.h>
|
2021-09-23 02:37:51 +00:00
|
|
|
#include <linux/fs.h>
|
2023-08-01 17:22:00 +00:00
|
|
|
#include <linux/iomap.h>
|
2021-12-02 20:34:00 +00:00
|
|
|
#include <linux/module.h>
|
2021-09-07 14:13:02 +00:00
|
|
|
#include "blk.h"
|
|
|
|
|
2021-10-13 08:57:11 +00:00
|
|
|
static inline struct inode *bdev_file_inode(struct file *file)
|
2021-09-07 14:13:02 +00:00
|
|
|
{
|
|
|
|
return file->f_mapping->host;
|
|
|
|
}
|
|
|
|
|
2022-07-14 18:06:32 +00:00
|
|
|
static blk_opf_t dio_bio_write_op(struct kiocb *iocb)
|
2021-09-07 14:13:02 +00:00
|
|
|
{
|
2022-07-14 18:06:32 +00:00
|
|
|
blk_opf_t opf = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE;
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
/* avoid the need for a I/O completion work item */
|
2022-05-22 13:39:27 +00:00
|
|
|
if (iocb_is_dsync(iocb))
|
2022-07-14 18:06:32 +00:00
|
|
|
opf |= REQ_FUA;
|
|
|
|
return opf;
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
2022-06-10 19:58:24 +00:00
|
|
|
static bool blkdev_dio_unaligned(struct block_device *bdev, loff_t pos,
|
|
|
|
struct iov_iter *iter)
|
|
|
|
{
|
2022-06-10 19:58:29 +00:00
|
|
|
return pos & (bdev_logical_block_size(bdev) - 1) ||
|
|
|
|
!bdev_iter_is_aligned(bdev, iter);
|
2022-06-10 19:58:24 +00:00
|
|
|
}
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
#define DIO_INLINE_BIO_VECS 4
|
|
|
|
|
|
|
|
static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
|
|
|
|
struct iov_iter *iter, unsigned int nr_pages)
|
|
|
|
{
|
2023-06-08 11:02:56 +00:00
|
|
|
struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host);
|
2021-09-07 14:13:02 +00:00
|
|
|
struct bio_vec inline_vecs[DIO_INLINE_BIO_VECS], *vecs;
|
|
|
|
loff_t pos = iocb->ki_pos;
|
|
|
|
bool should_dirty = false;
|
|
|
|
struct bio bio;
|
|
|
|
ssize_t ret;
|
|
|
|
|
2022-06-10 19:58:24 +00:00
|
|
|
if (blkdev_dio_unaligned(bdev, pos, iter))
|
2021-09-07 14:13:02 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (nr_pages <= DIO_INLINE_BIO_VECS)
|
|
|
|
vecs = inline_vecs;
|
|
|
|
else {
|
|
|
|
vecs = kmalloc_array(nr_pages, sizeof(struct bio_vec),
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!vecs)
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
2022-01-24 09:11:06 +00:00
|
|
|
if (iov_iter_rw(iter) == READ) {
|
|
|
|
bio_init(&bio, bdev, vecs, nr_pages, REQ_OP_READ);
|
2022-05-22 18:59:25 +00:00
|
|
|
if (user_backed_iter(iter))
|
2022-01-24 09:11:06 +00:00
|
|
|
should_dirty = true;
|
|
|
|
} else {
|
|
|
|
bio_init(&bio, bdev, vecs, nr_pages, dio_bio_write_op(iocb));
|
|
|
|
}
|
2021-10-20 19:00:50 +00:00
|
|
|
bio.bi_iter.bi_sector = pos >> SECTOR_SHIFT;
|
2024-02-02 20:39:25 +00:00
|
|
|
bio.bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
|
2021-09-07 14:13:02 +00:00
|
|
|
bio.bi_ioprio = iocb->ki_ioprio;
|
|
|
|
|
|
|
|
ret = bio_iov_iter_get_pages(&bio, iter);
|
|
|
|
if (unlikely(ret))
|
|
|
|
goto out;
|
|
|
|
ret = bio.bi_iter.bi_size;
|
|
|
|
|
2022-01-24 09:11:06 +00:00
|
|
|
if (iov_iter_rw(iter) == WRITE)
|
2021-09-07 14:13:02 +00:00
|
|
|
task_io_account_write(ret);
|
2022-01-24 09:11:06 +00:00
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT)
|
|
|
|
bio.bi_opf |= REQ_NOWAIT;
|
2022-04-20 14:31:10 +00:00
|
|
|
|
|
|
|
submit_bio_wait(&bio);
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
bio_release_pages(&bio, should_dirty);
|
|
|
|
if (unlikely(bio.bi_status))
|
|
|
|
ret = blk_status_to_errno(bio.bi_status);
|
|
|
|
|
|
|
|
out:
|
|
|
|
if (vecs != inline_vecs)
|
|
|
|
kfree(vecs);
|
|
|
|
|
|
|
|
bio_uninit(&bio);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2021-10-14 17:17:43 +00:00
|
|
|
enum {
|
2021-10-27 12:21:09 +00:00
|
|
|
DIO_SHOULD_DIRTY = 1,
|
|
|
|
DIO_IS_SYNC = 2,
|
2021-10-14 17:17:43 +00:00
|
|
|
};
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
struct blkdev_dio {
|
|
|
|
union {
|
|
|
|
struct kiocb *iocb;
|
|
|
|
struct task_struct *waiter;
|
|
|
|
};
|
|
|
|
size_t size;
|
|
|
|
atomic_t ref;
|
2021-10-14 17:17:43 +00:00
|
|
|
unsigned int flags;
|
2021-10-15 22:55:05 +00:00
|
|
|
struct bio bio ____cacheline_aligned_in_smp;
|
2021-09-07 14:13:02 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct bio_set blkdev_dio_pool;
|
|
|
|
|
|
|
|
static void blkdev_bio_end_io(struct bio *bio)
|
|
|
|
{
|
|
|
|
struct blkdev_dio *dio = bio->bi_private;
|
2021-10-14 17:17:43 +00:00
|
|
|
bool should_dirty = dio->flags & DIO_SHOULD_DIRTY;
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
if (bio->bi_status && !dio->bio.bi_status)
|
|
|
|
dio->bio.bi_status = bio->bi_status;
|
|
|
|
|
2021-10-27 12:21:09 +00:00
|
|
|
if (atomic_dec_and_test(&dio->ref)) {
|
2021-10-14 17:17:43 +00:00
|
|
|
if (!(dio->flags & DIO_IS_SYNC)) {
|
2021-09-07 14:13:02 +00:00
|
|
|
struct kiocb *iocb = dio->iocb;
|
|
|
|
ssize_t ret;
|
|
|
|
|
2021-10-12 11:12:24 +00:00
|
|
|
WRITE_ONCE(iocb->private, NULL);
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
if (likely(!dio->bio.bi_status)) {
|
|
|
|
ret = dio->size;
|
|
|
|
iocb->ki_pos += ret;
|
|
|
|
} else {
|
|
|
|
ret = blk_status_to_errno(dio->bio.bi_status);
|
|
|
|
}
|
|
|
|
|
2021-10-21 15:22:35 +00:00
|
|
|
dio->iocb->ki_complete(iocb, ret);
|
2021-10-27 12:21:09 +00:00
|
|
|
bio_put(&dio->bio);
|
2021-09-07 14:13:02 +00:00
|
|
|
} else {
|
|
|
|
struct task_struct *waiter = dio->waiter;
|
|
|
|
|
|
|
|
WRITE_ONCE(dio->waiter, NULL);
|
|
|
|
blk_wake_io_task(waiter);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (should_dirty) {
|
|
|
|
bio_check_pages_dirty(bio);
|
|
|
|
} else {
|
|
|
|
bio_release_pages(bio, false);
|
|
|
|
bio_put(bio);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
|
|
|
|
unsigned int nr_pages)
|
|
|
|
{
|
2023-06-08 11:02:56 +00:00
|
|
|
struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host);
|
2021-09-07 14:13:02 +00:00
|
|
|
struct blk_plug plug;
|
|
|
|
struct blkdev_dio *dio;
|
|
|
|
struct bio *bio;
|
|
|
|
bool is_read = (iov_iter_rw(iter) == READ), is_sync;
|
2022-07-14 18:06:32 +00:00
|
|
|
blk_opf_t opf = is_read ? REQ_OP_READ : dio_bio_write_op(iocb);
|
2021-09-07 14:13:02 +00:00
|
|
|
loff_t pos = iocb->ki_pos;
|
|
|
|
int ret = 0;
|
|
|
|
|
2022-06-10 19:58:24 +00:00
|
|
|
if (blkdev_dio_unaligned(bdev, pos, iter))
|
2021-09-07 14:13:02 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
2022-03-24 20:35:24 +00:00
|
|
|
if (iocb->ki_flags & IOCB_ALLOC_CACHE)
|
|
|
|
opf |= REQ_ALLOC_CACHE;
|
|
|
|
bio = bio_alloc_bioset(bdev, nr_pages, opf, GFP_KERNEL,
|
|
|
|
&blkdev_dio_pool);
|
2021-09-07 14:13:02 +00:00
|
|
|
dio = container_of(bio, struct blkdev_dio, bio);
|
2021-10-27 12:21:09 +00:00
|
|
|
atomic_set(&dio->ref, 1);
|
|
|
|
/*
|
|
|
|
* Grab an extra reference to ensure the dio structure which is embedded
|
|
|
|
* into the first bio stays around.
|
|
|
|
*/
|
|
|
|
bio_get(bio);
|
|
|
|
|
2021-10-14 17:17:43 +00:00
|
|
|
is_sync = is_sync_kiocb(iocb);
|
|
|
|
if (is_sync) {
|
|
|
|
dio->flags = DIO_IS_SYNC;
|
2021-09-07 14:13:02 +00:00
|
|
|
dio->waiter = current;
|
|
|
|
} else {
|
2021-10-14 17:17:43 +00:00
|
|
|
dio->flags = 0;
|
2021-09-07 14:13:02 +00:00
|
|
|
dio->iocb = iocb;
|
|
|
|
}
|
|
|
|
|
|
|
|
dio->size = 0;
|
2022-05-22 18:59:25 +00:00
|
|
|
if (is_read && user_backed_iter(iter))
|
2021-10-14 17:17:43 +00:00
|
|
|
dio->flags |= DIO_SHOULD_DIRTY;
|
2021-09-07 14:13:02 +00:00
|
|
|
|
2021-10-27 12:21:08 +00:00
|
|
|
blk_start_plug(&plug);
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
for (;;) {
|
2021-10-20 19:00:50 +00:00
|
|
|
bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
|
2024-02-02 20:39:25 +00:00
|
|
|
bio->bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
|
2021-09-07 14:13:02 +00:00
|
|
|
bio->bi_private = dio;
|
|
|
|
bio->bi_end_io = blkdev_bio_end_io;
|
|
|
|
bio->bi_ioprio = iocb->ki_ioprio;
|
|
|
|
|
|
|
|
ret = bio_iov_iter_get_pages(bio, iter);
|
|
|
|
if (unlikely(ret)) {
|
|
|
|
bio->bi_status = BLK_STS_IOERR;
|
|
|
|
bio_endio(bio);
|
|
|
|
break;
|
|
|
|
}
|
2023-01-16 15:55:53 +00:00
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT) {
|
|
|
|
/*
|
|
|
|
* This is nonblocking IO, and we need to allocate
|
|
|
|
* another bio if we have data left to map. As we
|
|
|
|
* cannot guarantee that one of the sub bios will not
|
|
|
|
* fail getting issued FOR NOWAIT and as error results
|
|
|
|
* are coalesced across all of them, be safe and ask for
|
|
|
|
* a retry of this from blocking context.
|
|
|
|
*/
|
|
|
|
if (unlikely(iov_iter_count(iter))) {
|
|
|
|
bio_release_pages(bio, false);
|
|
|
|
bio_clear_flag(bio, BIO_REFFED);
|
|
|
|
bio_put(bio);
|
|
|
|
blk_finish_plug(&plug);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
bio->bi_opf |= REQ_NOWAIT;
|
|
|
|
}
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
if (is_read) {
|
2021-10-14 17:17:43 +00:00
|
|
|
if (dio->flags & DIO_SHOULD_DIRTY)
|
2021-09-07 14:13:02 +00:00
|
|
|
bio_set_pages_dirty(bio);
|
|
|
|
} else {
|
|
|
|
task_io_account_write(bio->bi_iter.bi_size);
|
|
|
|
}
|
|
|
|
dio->size += bio->bi_iter.bi_size;
|
|
|
|
pos += bio->bi_iter.bi_size;
|
|
|
|
|
|
|
|
nr_pages = bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS);
|
|
|
|
if (!nr_pages) {
|
2021-10-12 11:12:24 +00:00
|
|
|
submit_bio(bio);
|
2021-09-07 14:13:02 +00:00
|
|
|
break;
|
|
|
|
}
|
2021-10-27 12:21:09 +00:00
|
|
|
atomic_inc(&dio->ref);
|
2021-09-07 14:13:02 +00:00
|
|
|
submit_bio(bio);
|
2022-01-24 09:11:05 +00:00
|
|
|
bio = bio_alloc(bdev, nr_pages, opf, GFP_KERNEL);
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
2021-10-27 12:21:08 +00:00
|
|
|
blk_finish_plug(&plug);
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
if (!is_sync)
|
|
|
|
return -EIOCBQUEUED;
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
|
|
if (!READ_ONCE(dio->waiter))
|
|
|
|
break;
|
2021-10-27 12:21:08 +00:00
|
|
|
blk_io_schedule();
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
|
|
|
|
if (!ret)
|
|
|
|
ret = blk_status_to_errno(dio->bio.bi_status);
|
|
|
|
if (likely(!ret))
|
|
|
|
ret = dio->size;
|
|
|
|
|
|
|
|
bio_put(&dio->bio);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2021-10-23 16:21:32 +00:00
|
|
|
static void blkdev_bio_end_io_async(struct bio *bio)
|
|
|
|
{
|
|
|
|
struct blkdev_dio *dio = container_of(bio, struct blkdev_dio, bio);
|
|
|
|
struct kiocb *iocb = dio->iocb;
|
|
|
|
ssize_t ret;
|
|
|
|
|
2022-02-11 09:01:36 +00:00
|
|
|
WRITE_ONCE(iocb->private, NULL);
|
|
|
|
|
2021-10-23 16:21:32 +00:00
|
|
|
if (likely(!bio->bi_status)) {
|
|
|
|
ret = dio->size;
|
|
|
|
iocb->ki_pos += ret;
|
|
|
|
} else {
|
|
|
|
ret = blk_status_to_errno(bio->bi_status);
|
|
|
|
}
|
|
|
|
|
2021-11-01 17:17:11 +00:00
|
|
|
iocb->ki_complete(iocb, ret);
|
2021-10-23 16:21:32 +00:00
|
|
|
|
|
|
|
if (dio->flags & DIO_SHOULD_DIRTY) {
|
|
|
|
bio_check_pages_dirty(bio);
|
|
|
|
} else {
|
|
|
|
bio_release_pages(bio, false);
|
|
|
|
bio_put(bio);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb,
|
|
|
|
struct iov_iter *iter,
|
|
|
|
unsigned int nr_pages)
|
|
|
|
{
|
2023-06-08 11:02:56 +00:00
|
|
|
struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host);
|
2022-01-24 09:11:04 +00:00
|
|
|
bool is_read = iov_iter_rw(iter) == READ;
|
2022-07-14 18:06:32 +00:00
|
|
|
blk_opf_t opf = is_read ? REQ_OP_READ : dio_bio_write_op(iocb);
|
2021-10-23 16:21:32 +00:00
|
|
|
struct blkdev_dio *dio;
|
|
|
|
struct bio *bio;
|
|
|
|
loff_t pos = iocb->ki_pos;
|
|
|
|
int ret = 0;
|
|
|
|
|
2022-06-10 19:58:24 +00:00
|
|
|
if (blkdev_dio_unaligned(bdev, pos, iter))
|
2021-10-23 16:21:32 +00:00
|
|
|
return -EINVAL;
|
|
|
|
|
2022-03-24 20:35:24 +00:00
|
|
|
if (iocb->ki_flags & IOCB_ALLOC_CACHE)
|
|
|
|
opf |= REQ_ALLOC_CACHE;
|
|
|
|
bio = bio_alloc_bioset(bdev, nr_pages, opf, GFP_KERNEL,
|
|
|
|
&blkdev_dio_pool);
|
2021-10-23 16:21:32 +00:00
|
|
|
dio = container_of(bio, struct blkdev_dio, bio);
|
|
|
|
dio->flags = 0;
|
|
|
|
dio->iocb = iocb;
|
|
|
|
bio->bi_iter.bi_sector = pos >> SECTOR_SHIFT;
|
2024-02-02 20:39:25 +00:00
|
|
|
bio->bi_write_hint = file_inode(iocb->ki_filp)->i_write_hint;
|
2021-10-23 16:21:32 +00:00
|
|
|
bio->bi_end_io = blkdev_bio_end_io_async;
|
|
|
|
bio->bi_ioprio = iocb->ki_ioprio;
|
|
|
|
|
2021-10-27 12:21:07 +00:00
|
|
|
if (iov_iter_is_bvec(iter)) {
|
|
|
|
/*
|
|
|
|
* Users don't rely on the iterator being in any particular
|
|
|
|
* state for async I/O returning -EIOCBQUEUED, hence we can
|
|
|
|
* avoid expensive iov_iter_advance(). Bypass
|
|
|
|
* bio_iov_iter_get_pages() and set the bvec directly.
|
|
|
|
*/
|
|
|
|
bio_iov_bvec_set(bio, iter);
|
|
|
|
} else {
|
|
|
|
ret = bio_iov_iter_get_pages(bio, iter);
|
|
|
|
if (unlikely(ret)) {
|
2021-12-07 20:16:36 +00:00
|
|
|
bio_put(bio);
|
2021-10-27 12:21:07 +00:00
|
|
|
return ret;
|
|
|
|
}
|
2021-10-23 16:21:32 +00:00
|
|
|
}
|
|
|
|
dio->size = bio->bi_iter.bi_size;
|
|
|
|
|
2022-01-24 09:11:04 +00:00
|
|
|
if (is_read) {
|
2022-05-22 18:59:25 +00:00
|
|
|
if (user_backed_iter(iter)) {
|
2021-10-23 16:21:32 +00:00
|
|
|
dio->flags |= DIO_SHOULD_DIRTY;
|
|
|
|
bio_set_pages_dirty(bio);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
task_io_account_write(bio->bi_iter.bi_size);
|
|
|
|
}
|
|
|
|
|
2023-08-08 17:06:17 +00:00
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT)
|
|
|
|
bio->bi_opf |= REQ_NOWAIT;
|
|
|
|
|
2021-10-23 16:21:32 +00:00
|
|
|
if (iocb->ki_flags & IOCB_HIPRI) {
|
2023-08-08 17:06:17 +00:00
|
|
|
bio->bi_opf |= REQ_POLLED;
|
2021-10-23 16:21:32 +00:00
|
|
|
submit_bio(bio);
|
|
|
|
WRITE_ONCE(iocb->private, bio);
|
|
|
|
} else {
|
|
|
|
submit_bio(bio);
|
|
|
|
}
|
|
|
|
return -EIOCBQUEUED;
|
|
|
|
}
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
|
|
|
{
|
|
|
|
unsigned int nr_pages;
|
|
|
|
|
|
|
|
if (!iov_iter_count(iter))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
nr_pages = bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS + 1);
|
2021-10-23 16:21:32 +00:00
|
|
|
if (likely(nr_pages <= BIO_MAX_VECS)) {
|
|
|
|
if (is_sync_kiocb(iocb))
|
|
|
|
return __blkdev_direct_IO_simple(iocb, iter, nr_pages);
|
|
|
|
return __blkdev_direct_IO_async(iocb, iter, nr_pages);
|
|
|
|
}
|
2021-09-07 14:13:02 +00:00
|
|
|
return __blkdev_direct_IO(iocb, iter, bio_max_segs(nr_pages));
|
|
|
|
}
|
|
|
|
|
2023-08-01 17:22:00 +00:00
|
|
|
static int blkdev_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
|
|
|
|
unsigned int flags, struct iomap *iomap, struct iomap *srcmap)
|
|
|
|
{
|
|
|
|
struct block_device *bdev = I_BDEV(inode);
|
|
|
|
loff_t isize = i_size_read(inode);
|
|
|
|
|
|
|
|
iomap->bdev = bdev;
|
|
|
|
iomap->offset = ALIGN_DOWN(offset, bdev_logical_block_size(bdev));
|
|
|
|
if (iomap->offset >= isize)
|
|
|
|
return -EIO;
|
|
|
|
iomap->type = IOMAP_MAPPED;
|
|
|
|
iomap->addr = iomap->offset;
|
|
|
|
iomap->length = isize - iomap->offset;
|
2023-08-01 17:22:01 +00:00
|
|
|
iomap->flags |= IOMAP_F_BUFFER_HEAD; /* noop for !CONFIG_BUFFER_HEAD */
|
2023-08-01 17:22:00 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct iomap_ops blkdev_iomap_ops = {
|
|
|
|
.iomap_begin = blkdev_iomap_begin,
|
|
|
|
};
|
|
|
|
|
2023-08-01 17:22:01 +00:00
|
|
|
#ifdef CONFIG_BUFFER_HEAD
|
|
|
|
static int blkdev_get_block(struct inode *inode, sector_t iblock,
|
|
|
|
struct buffer_head *bh, int create)
|
|
|
|
{
|
|
|
|
bh->b_bdev = I_BDEV(inode);
|
|
|
|
bh->b_blocknr = iblock;
|
|
|
|
set_buffer_mapped(bh);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2023-12-15 20:02:44 +00:00
|
|
|
/*
|
|
|
|
* We cannot call mpage_writepages() as it does not take the buffer lock.
|
|
|
|
* We must use block_write_full_folio() directly which holds the buffer
|
|
|
|
* lock. The buffer lock provides the synchronisation with writeback
|
|
|
|
* that filesystems rely on when they use the blockdev's mapping.
|
|
|
|
*/
|
|
|
|
static int blkdev_writepages(struct address_space *mapping,
|
|
|
|
struct writeback_control *wbc)
|
2021-09-07 14:13:02 +00:00
|
|
|
{
|
2023-12-15 20:02:44 +00:00
|
|
|
struct blk_plug plug;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
blk_start_plug(&plug);
|
|
|
|
err = write_cache_pages(mapping, wbc, block_write_full_folio,
|
|
|
|
blkdev_get_block);
|
|
|
|
blk_finish_plug(&plug);
|
|
|
|
|
|
|
|
return err;
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
2022-04-29 14:40:40 +00:00
|
|
|
static int blkdev_read_folio(struct file *file, struct folio *folio)
|
2021-09-07 14:13:02 +00:00
|
|
|
{
|
2022-04-29 14:40:40 +00:00
|
|
|
return block_read_full_folio(folio, blkdev_get_block);
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void blkdev_readahead(struct readahead_control *rac)
|
|
|
|
{
|
|
|
|
mpage_readahead(rac, blkdev_get_block);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int blkdev_write_begin(struct file *file, struct address_space *mapping,
|
2022-02-22 19:31:43 +00:00
|
|
|
loff_t pos, unsigned len, struct page **pagep, void **fsdata)
|
2021-09-07 14:13:02 +00:00
|
|
|
{
|
2022-02-22 16:25:12 +00:00
|
|
|
return block_write_begin(mapping, pos, len, pagep, blkdev_get_block);
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int blkdev_write_end(struct file *file, struct address_space *mapping,
|
|
|
|
loff_t pos, unsigned len, unsigned copied, struct page *page,
|
|
|
|
void *fsdata)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
ret = block_write_end(file, mapping, pos, len, copied, page, fsdata);
|
|
|
|
|
|
|
|
unlock_page(page);
|
|
|
|
put_page(page);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
const struct address_space_operations def_blk_aops = {
|
2022-02-09 20:22:12 +00:00
|
|
|
.dirty_folio = block_dirty_folio,
|
2022-02-09 20:21:34 +00:00
|
|
|
.invalidate_folio = block_invalidate_folio,
|
2022-04-29 14:40:40 +00:00
|
|
|
.read_folio = blkdev_read_folio,
|
2021-09-07 14:13:02 +00:00
|
|
|
.readahead = blkdev_readahead,
|
2023-12-15 20:02:44 +00:00
|
|
|
.writepages = blkdev_writepages,
|
2021-09-07 14:13:02 +00:00
|
|
|
.write_begin = blkdev_write_begin,
|
|
|
|
.write_end = blkdev_write_end,
|
2022-06-06 14:20:31 +00:00
|
|
|
.migrate_folio = buffer_migrate_folio_norefs,
|
2021-09-07 14:13:02 +00:00
|
|
|
.is_dirty_writeback = buffer_check_dirty_writeback,
|
|
|
|
};
|
2023-08-01 17:22:01 +00:00
|
|
|
#else /* CONFIG_BUFFER_HEAD */
|
|
|
|
static int blkdev_read_folio(struct file *file, struct folio *folio)
|
|
|
|
{
|
|
|
|
return iomap_read_folio(folio, &blkdev_iomap_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void blkdev_readahead(struct readahead_control *rac)
|
|
|
|
{
|
|
|
|
iomap_readahead(rac, &blkdev_iomap_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int blkdev_map_blocks(struct iomap_writepage_ctx *wpc,
|
|
|
|
struct inode *inode, loff_t offset)
|
|
|
|
{
|
|
|
|
loff_t isize = i_size_read(inode);
|
|
|
|
|
|
|
|
if (WARN_ON_ONCE(offset >= isize))
|
|
|
|
return -EIO;
|
|
|
|
if (offset >= wpc->iomap.offset &&
|
|
|
|
offset < wpc->iomap.offset + wpc->iomap.length)
|
|
|
|
return 0;
|
|
|
|
return blkdev_iomap_begin(inode, offset, isize - offset,
|
|
|
|
IOMAP_WRITE, &wpc->iomap, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct iomap_writeback_ops blkdev_writeback_ops = {
|
|
|
|
.map_blocks = blkdev_map_blocks,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int blkdev_writepages(struct address_space *mapping,
|
|
|
|
struct writeback_control *wbc)
|
|
|
|
{
|
|
|
|
struct iomap_writepage_ctx wpc = { };
|
|
|
|
|
|
|
|
return iomap_writepages(mapping, wbc, &wpc, &blkdev_writeback_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
const struct address_space_operations def_blk_aops = {
|
|
|
|
.dirty_folio = filemap_dirty_folio,
|
|
|
|
.release_folio = iomap_release_folio,
|
|
|
|
.invalidate_folio = iomap_invalidate_folio,
|
|
|
|
.read_folio = blkdev_read_folio,
|
|
|
|
.readahead = blkdev_readahead,
|
|
|
|
.writepages = blkdev_writepages,
|
|
|
|
.is_partially_uptodate = iomap_is_partially_uptodate,
|
2023-11-17 16:14:47 +00:00
|
|
|
.error_remove_folio = generic_error_remove_folio,
|
2023-08-01 17:22:01 +00:00
|
|
|
.migrate_folio = filemap_migrate_folio,
|
|
|
|
};
|
|
|
|
#endif /* CONFIG_BUFFER_HEAD */
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* for a block special file file_inode(file)->i_size is zero
|
|
|
|
* so we compute the size by hand (just as in block_read/write above)
|
|
|
|
*/
|
|
|
|
static loff_t blkdev_llseek(struct file *file, loff_t offset, int whence)
|
|
|
|
{
|
|
|
|
struct inode *bd_inode = bdev_file_inode(file);
|
|
|
|
loff_t retval;
|
|
|
|
|
|
|
|
inode_lock(bd_inode);
|
|
|
|
retval = fixed_size_llseek(file, offset, whence, i_size_read(bd_inode));
|
|
|
|
inode_unlock(bd_inode);
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
|
|
|
|
int datasync)
|
|
|
|
{
|
2023-06-08 11:02:56 +00:00
|
|
|
struct block_device *bdev = I_BDEV(filp->f_mapping->host);
|
2021-09-07 14:13:02 +00:00
|
|
|
int error;
|
|
|
|
|
|
|
|
error = file_write_and_wait_range(filp, start, end);
|
|
|
|
if (error)
|
|
|
|
return error;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* There is no need to serialise calls to blkdev_issue_flush with
|
|
|
|
* i_mutex and doing so causes performance issues with concurrent
|
|
|
|
* O_SYNC writers to a block device.
|
|
|
|
*/
|
|
|
|
error = blkdev_issue_flush(bdev);
|
|
|
|
if (error == -EOPNOTSUPP)
|
|
|
|
error = 0;
|
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2023-09-27 09:34:08 +00:00
|
|
|
/**
|
|
|
|
* file_to_blk_mode - get block open flags from file flags
|
|
|
|
* @file: file whose open flags should be converted
|
|
|
|
*
|
|
|
|
* Look at file open flags and generate corresponding block open flags from
|
|
|
|
* them. The function works both for file just being open (e.g. during ->open
|
|
|
|
* callback) and for file that is already open. This is actually non-trivial
|
|
|
|
* (see comment in the function).
|
|
|
|
*/
|
2023-06-08 11:02:55 +00:00
|
|
|
blk_mode_t file_to_blk_mode(struct file *file)
|
|
|
|
{
|
|
|
|
blk_mode_t mode = 0;
|
2023-09-27 09:34:08 +00:00
|
|
|
struct bdev_handle *handle = file->private_data;
|
2023-06-08 11:02:55 +00:00
|
|
|
|
|
|
|
if (file->f_mode & FMODE_READ)
|
|
|
|
mode |= BLK_OPEN_READ;
|
|
|
|
if (file->f_mode & FMODE_WRITE)
|
|
|
|
mode |= BLK_OPEN_WRITE;
|
2023-09-27 09:34:08 +00:00
|
|
|
/*
|
|
|
|
* do_dentry_open() clears O_EXCL from f_flags, use handle->mode to
|
|
|
|
* determine whether the open was exclusive for already open files.
|
|
|
|
*/
|
|
|
|
if (handle)
|
|
|
|
mode |= handle->mode & BLK_OPEN_EXCL;
|
|
|
|
else if (file->f_flags & O_EXCL)
|
2023-06-08 11:02:55 +00:00
|
|
|
mode |= BLK_OPEN_EXCL;
|
|
|
|
if (file->f_flags & O_NDELAY)
|
|
|
|
mode |= BLK_OPEN_NDELAY;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If all bits in O_ACCMODE set (aka O_RDWR | O_WRONLY), the floppy
|
|
|
|
* driver has historically allowed ioctls as if the file was opened for
|
|
|
|
* writing, but does not allow and actual reads or writes.
|
|
|
|
*/
|
|
|
|
if ((file->f_flags & O_ACCMODE) == (O_RDWR | O_WRONLY))
|
|
|
|
mode |= BLK_OPEN_WRITE_IOCTL;
|
|
|
|
|
|
|
|
return mode;
|
|
|
|
}
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
static int blkdev_open(struct inode *inode, struct file *filp)
|
|
|
|
{
|
2023-09-27 09:34:08 +00:00
|
|
|
struct bdev_handle *handle;
|
|
|
|
blk_mode_t mode;
|
2021-09-07 14:13:02 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Preserve backwards compatibility and allow large file access
|
|
|
|
* even if userspace doesn't ask for it explicitly. Some mkfs
|
|
|
|
* binary needs it. We might want to drop this workaround
|
|
|
|
* during an unstable branch.
|
|
|
|
*/
|
|
|
|
filp->f_flags |= O_LARGEFILE;
|
2023-08-01 17:21:59 +00:00
|
|
|
filp->f_mode |= FMODE_BUF_RASYNC | FMODE_CAN_ODIRECT;
|
2021-09-07 14:13:02 +00:00
|
|
|
|
2023-09-27 09:34:08 +00:00
|
|
|
mode = file_to_blk_mode(filp);
|
|
|
|
handle = bdev_open_by_dev(inode->i_rdev, mode,
|
|
|
|
mode & BLK_OPEN_EXCL ? filp : NULL, NULL);
|
|
|
|
if (IS_ERR(handle))
|
|
|
|
return PTR_ERR(handle);
|
2021-10-13 08:57:11 +00:00
|
|
|
|
2023-09-27 09:34:08 +00:00
|
|
|
if (bdev_nowait(handle->bdev))
|
2023-05-09 15:19:09 +00:00
|
|
|
filp->f_mode |= FMODE_NOWAIT;
|
|
|
|
|
2023-09-27 09:34:08 +00:00
|
|
|
filp->f_mapping = handle->bdev->bd_inode->i_mapping;
|
2021-09-07 14:13:02 +00:00
|
|
|
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
|
2023-09-27 09:34:08 +00:00
|
|
|
filp->private_data = handle;
|
2021-09-07 14:13:02 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2023-06-08 11:02:38 +00:00
|
|
|
static int blkdev_release(struct inode *inode, struct file *filp)
|
2021-09-07 14:13:02 +00:00
|
|
|
{
|
2023-09-27 09:34:08 +00:00
|
|
|
bdev_release(filp->private_data);
|
2021-09-07 14:13:02 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2023-08-01 17:21:58 +00:00
|
|
|
static ssize_t
|
|
|
|
blkdev_direct_write(struct kiocb *iocb, struct iov_iter *from)
|
|
|
|
{
|
|
|
|
size_t count = iov_iter_count(from);
|
|
|
|
ssize_t written;
|
|
|
|
|
|
|
|
written = kiocb_invalidate_pages(iocb, count);
|
|
|
|
if (written) {
|
|
|
|
if (written == -EBUSY)
|
|
|
|
return 0;
|
|
|
|
return written;
|
|
|
|
}
|
|
|
|
|
|
|
|
written = blkdev_direct_IO(iocb, from);
|
|
|
|
if (written > 0) {
|
|
|
|
kiocb_invalidate_post_direct_write(iocb, count);
|
|
|
|
iocb->ki_pos += written;
|
|
|
|
count -= written;
|
|
|
|
}
|
|
|
|
if (written != -EIOCBQUEUED)
|
|
|
|
iov_iter_revert(from, count - iov_iter_count(from));
|
|
|
|
return written;
|
|
|
|
}
|
|
|
|
|
2023-08-01 17:22:00 +00:00
|
|
|
static ssize_t blkdev_buffered_write(struct kiocb *iocb, struct iov_iter *from)
|
|
|
|
{
|
|
|
|
return iomap_file_buffered_write(iocb, from, &blkdev_iomap_ops);
|
|
|
|
}
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
/*
|
|
|
|
* Write data to the block device. Only intended for the block device itself
|
|
|
|
* and the raw driver which basically is a fake block device.
|
|
|
|
*
|
|
|
|
* Does not take i_mutex for the write and thus is not for general purpose
|
|
|
|
* use.
|
|
|
|
*/
|
|
|
|
static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
|
|
|
|
{
|
2023-08-01 17:21:58 +00:00
|
|
|
struct file *file = iocb->ki_filp;
|
|
|
|
struct block_device *bdev = I_BDEV(file->f_mapping->host);
|
2021-10-13 08:57:11 +00:00
|
|
|
struct inode *bd_inode = bdev->bd_inode;
|
2021-11-04 21:13:17 +00:00
|
|
|
loff_t size = bdev_nr_bytes(bdev);
|
2021-09-07 14:13:02 +00:00
|
|
|
size_t shorted = 0;
|
|
|
|
ssize_t ret;
|
|
|
|
|
2021-10-13 08:57:11 +00:00
|
|
|
if (bdev_read_only(bdev))
|
2021-09-07 14:13:02 +00:00
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
if (IS_SWAPFILE(bd_inode) && !is_hibernate_resume_dev(bd_inode->i_rdev))
|
|
|
|
return -ETXTBSY;
|
|
|
|
|
|
|
|
if (!iov_iter_count(from))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (iocb->ki_pos >= size)
|
|
|
|
return -ENOSPC;
|
|
|
|
|
|
|
|
if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
|
|
|
size -= iocb->ki_pos;
|
|
|
|
if (iov_iter_count(from) > size) {
|
|
|
|
shorted = iov_iter_count(from) - size;
|
|
|
|
iov_iter_truncate(from, size);
|
|
|
|
}
|
|
|
|
|
2023-08-01 17:21:58 +00:00
|
|
|
ret = file_update_time(file);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) {
|
|
|
|
ret = blkdev_direct_write(iocb, from);
|
|
|
|
if (ret >= 0 && iov_iter_count(from))
|
|
|
|
ret = direct_write_fallback(iocb, from, ret,
|
2023-08-01 17:22:00 +00:00
|
|
|
blkdev_buffered_write(iocb, from));
|
2023-08-01 17:21:58 +00:00
|
|
|
} else {
|
2023-08-01 17:22:00 +00:00
|
|
|
ret = blkdev_buffered_write(iocb, from);
|
2023-08-01 17:21:58 +00:00
|
|
|
}
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
if (ret > 0)
|
|
|
|
ret = generic_write_sync(iocb, ret);
|
|
|
|
iov_iter_reexpand(from, iov_iter_count(from) + shorted);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
|
|
|
|
{
|
2023-06-08 11:02:56 +00:00
|
|
|
struct block_device *bdev = I_BDEV(iocb->ki_filp->f_mapping->host);
|
2021-11-04 21:13:17 +00:00
|
|
|
loff_t size = bdev_nr_bytes(bdev);
|
2021-09-07 14:13:02 +00:00
|
|
|
loff_t pos = iocb->ki_pos;
|
|
|
|
size_t shorted = 0;
|
2021-10-28 14:57:09 +00:00
|
|
|
ssize_t ret = 0;
|
2022-02-01 10:04:20 +00:00
|
|
|
size_t count;
|
2021-09-07 14:13:02 +00:00
|
|
|
|
2022-02-01 10:04:20 +00:00
|
|
|
if (unlikely(pos + iov_iter_count(to) > size)) {
|
2021-10-20 19:00:48 +00:00
|
|
|
if (pos >= size)
|
|
|
|
return 0;
|
|
|
|
size -= pos;
|
2022-02-01 10:04:20 +00:00
|
|
|
shorted = iov_iter_count(to) - size;
|
|
|
|
iov_iter_truncate(to, size);
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
2022-02-01 10:04:20 +00:00
|
|
|
count = iov_iter_count(to);
|
|
|
|
if (!count)
|
|
|
|
goto reexpand; /* skip atime */
|
|
|
|
|
2021-10-28 14:57:09 +00:00
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) {
|
2023-06-01 14:58:56 +00:00
|
|
|
ret = kiocb_write_and_wait(iocb, count);
|
|
|
|
if (ret < 0)
|
|
|
|
goto reexpand;
|
2021-10-28 14:57:09 +00:00
|
|
|
file_accessed(iocb->ki_filp);
|
|
|
|
|
|
|
|
ret = blkdev_direct_IO(iocb, to);
|
|
|
|
if (ret >= 0) {
|
|
|
|
iocb->ki_pos += ret;
|
|
|
|
count -= ret;
|
|
|
|
}
|
2022-02-01 10:04:20 +00:00
|
|
|
iov_iter_revert(to, count - iov_iter_count(to));
|
2021-10-28 14:57:09 +00:00
|
|
|
if (ret < 0 || !count)
|
2022-02-01 10:04:20 +00:00
|
|
|
goto reexpand;
|
2021-10-28 14:57:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
ret = filemap_read(iocb, to, ret);
|
2021-10-20 19:00:48 +00:00
|
|
|
|
2022-02-01 10:04:20 +00:00
|
|
|
reexpand:
|
2021-10-20 19:00:48 +00:00
|
|
|
if (unlikely(shorted))
|
|
|
|
iov_iter_reexpand(to, iov_iter_count(to) + shorted);
|
2021-09-07 14:13:02 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define BLKDEV_FALLOC_FL_SUPPORTED \
|
|
|
|
(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
|
|
|
|
FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE)
|
|
|
|
|
|
|
|
static long blkdev_fallocate(struct file *file, int mode, loff_t start,
|
|
|
|
loff_t len)
|
|
|
|
{
|
2021-09-23 02:37:51 +00:00
|
|
|
struct inode *inode = bdev_file_inode(file);
|
|
|
|
struct block_device *bdev = I_BDEV(inode);
|
2021-09-07 14:13:02 +00:00
|
|
|
loff_t end = start + len - 1;
|
|
|
|
loff_t isize;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
/* Fail if we don't recognize the flags. */
|
|
|
|
if (mode & ~BLKDEV_FALLOC_FL_SUPPORTED)
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
|
|
|
/* Don't go off the end of the device. */
|
2021-10-18 10:11:24 +00:00
|
|
|
isize = bdev_nr_bytes(bdev);
|
2021-09-07 14:13:02 +00:00
|
|
|
if (start >= isize)
|
|
|
|
return -EINVAL;
|
|
|
|
if (end >= isize) {
|
|
|
|
if (mode & FALLOC_FL_KEEP_SIZE) {
|
|
|
|
len = isize - start;
|
|
|
|
end = start + len - 1;
|
|
|
|
} else
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Don't allow IO that isn't aligned to logical block size.
|
|
|
|
*/
|
|
|
|
if ((start | len) & (bdev_logical_block_size(bdev) - 1))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2021-09-23 02:37:51 +00:00
|
|
|
filemap_invalidate_lock(inode->i_mapping);
|
|
|
|
|
2023-10-11 20:12:30 +00:00
|
|
|
/*
|
|
|
|
* Invalidate the page cache, including dirty pages, for valid
|
|
|
|
* de-allocate mode calls to fallocate().
|
|
|
|
*/
|
2021-09-07 14:13:02 +00:00
|
|
|
switch (mode) {
|
|
|
|
case FALLOC_FL_ZERO_RANGE:
|
|
|
|
case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
|
2023-10-11 20:12:30 +00:00
|
|
|
error = truncate_bdev_range(bdev, file_to_blk_mode(file), start, end);
|
|
|
|
if (error)
|
|
|
|
goto fail;
|
|
|
|
|
2021-10-20 19:00:50 +00:00
|
|
|
error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
|
|
|
|
len >> SECTOR_SHIFT, GFP_KERNEL,
|
|
|
|
BLKDEV_ZERO_NOUNMAP);
|
2021-09-07 14:13:02 +00:00
|
|
|
break;
|
|
|
|
case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
|
2023-10-11 20:12:30 +00:00
|
|
|
error = truncate_bdev_range(bdev, file_to_blk_mode(file), start, end);
|
|
|
|
if (error)
|
|
|
|
goto fail;
|
|
|
|
|
2021-10-20 19:00:50 +00:00
|
|
|
error = blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT,
|
|
|
|
len >> SECTOR_SHIFT, GFP_KERNEL,
|
|
|
|
BLKDEV_ZERO_NOFALLBACK);
|
2021-09-07 14:13:02 +00:00
|
|
|
break;
|
|
|
|
case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
|
2023-10-11 20:12:30 +00:00
|
|
|
error = truncate_bdev_range(bdev, file_to_blk_mode(file), start, end);
|
|
|
|
if (error)
|
|
|
|
goto fail;
|
|
|
|
|
2021-10-20 19:00:50 +00:00
|
|
|
error = blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
|
2022-04-15 04:52:57 +00:00
|
|
|
len >> SECTOR_SHIFT, GFP_KERNEL);
|
2021-09-07 14:13:02 +00:00
|
|
|
break;
|
|
|
|
default:
|
2021-09-23 02:37:51 +00:00
|
|
|
error = -EOPNOTSUPP;
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
2021-09-23 02:37:51 +00:00
|
|
|
fail:
|
|
|
|
filemap_invalidate_unlock(inode->i_mapping);
|
|
|
|
return error;
|
2021-09-07 14:13:02 +00:00
|
|
|
}
|
|
|
|
|
2023-05-10 07:42:23 +00:00
|
|
|
static int blkdev_mmap(struct file *file, struct vm_area_struct *vma)
|
|
|
|
{
|
|
|
|
struct inode *bd_inode = bdev_file_inode(file);
|
|
|
|
|
|
|
|
if (bdev_read_only(I_BDEV(bd_inode)))
|
|
|
|
return generic_file_readonly_mmap(file, vma);
|
|
|
|
|
|
|
|
return generic_file_mmap(file, vma);
|
|
|
|
}
|
|
|
|
|
2021-09-07 14:13:02 +00:00
|
|
|
const struct file_operations def_blk_fops = {
|
|
|
|
.open = blkdev_open,
|
2023-06-08 11:02:38 +00:00
|
|
|
.release = blkdev_release,
|
2021-09-07 14:13:02 +00:00
|
|
|
.llseek = blkdev_llseek,
|
|
|
|
.read_iter = blkdev_read_iter,
|
|
|
|
.write_iter = blkdev_write_iter,
|
2021-10-12 11:12:24 +00:00
|
|
|
.iopoll = iocb_bio_iopoll,
|
2023-05-10 07:42:23 +00:00
|
|
|
.mmap = blkdev_mmap,
|
2021-09-07 14:13:02 +00:00
|
|
|
.fsync = blkdev_fsync,
|
2021-10-12 10:44:50 +00:00
|
|
|
.unlocked_ioctl = blkdev_ioctl,
|
2021-09-07 14:13:02 +00:00
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
.compat_ioctl = compat_blkdev_ioctl,
|
|
|
|
#endif
|
2023-05-22 13:50:15 +00:00
|
|
|
.splice_read = filemap_splice_read,
|
2021-09-07 14:13:02 +00:00
|
|
|
.splice_write = iter_file_splice_write,
|
|
|
|
.fallocate = blkdev_fallocate,
|
|
|
|
};
|
|
|
|
|
|
|
|
static __init int blkdev_init(void)
|
|
|
|
{
|
|
|
|
return bioset_init(&blkdev_dio_pool, 4,
|
|
|
|
offsetof(struct blkdev_dio, bio),
|
|
|
|
BIOSET_NEED_BVECS|BIOSET_PERCPU_CACHE);
|
|
|
|
}
|
|
|
|
module_init(blkdev_init);
|