Release 4.10 fs/block_dev.c

/*
 *  linux/fs/block_dev.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 2001  Andrea Arcangeli <andrea@suse.de> SuSE
 */

#include <linux/init.h>
#include <linux/mm.h>
#include <linux/fcntl.h>
#include <linux/slab.h>
#include <linux/kmod.h>
#include <linux/major.h>
#include <linux/device_cgroup.h>
#include <linux/highmem.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/module.h>
#include <linux/blkpg.h>
#include <linux/magic.h>
#include <linux/buffer_head.h>
#include <linux/swap.h>
#include <linux/pagevec.h>
#include <linux/writeback.h>
#include <linux/mpage.h>
#include <linux/mount.h>
#include <linux/uio.h>
#include <linux/namei.h>
#include <linux/log2.h>
#include <linux/cleancache.h>
#include <linux/dax.h>
#include <linux/badblocks.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/falloc.h>
#include <linux/uaccess.h>
#include "internal.h"


struct bdev_inode {
	
struct block_device bdev;
	
struct inode vfs_inode;
};


static const struct address_space_operations def_blk_aops;



static inline struct bdev_inode *BDEV_I(struct inode *inode)
{
	return container_of(inode, struct bdev_inode, vfs_inode);
}

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struct block_device *I_BDEV(struct inode *inode)
{
	return &BDEV_I(inode)->bdev;
}
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EXPORT_SYMBOL(I_BDEV);



void __vfs_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	printk_ratelimited("%sVFS (%s): %pV\n", prefix, sb->s_id, &vaf);
	va_end(args);
}

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static void bdev_write_inode(struct block_device *bdev)
{
	struct inode *inode = bdev->bd_inode;
	int ret;

	spin_lock(&inode->i_lock);
	while (inode->i_state & I_DIRTY) {
		spin_unlock(&inode->i_lock);
		ret = write_inode_now(inode, true);
		if (ret) {
			char name[BDEVNAME_SIZE];
			pr_warn_ratelimited("VFS: Dirty inode writeback failed "
					    "for block device %s (err=%d).\n",
					    bdevname(bdev, name), ret);
		}
		spin_lock(&inode->i_lock);
	}
	spin_unlock(&inode->i_lock);
}

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/* Kill _all_ buffers and pagecache , dirty or not.. */


void kill_bdev(struct block_device *bdev)
{
	struct address_space *mapping = bdev->bd_inode->i_mapping;

	if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
		return;

	invalidate_bh_lrus();
	truncate_inode_pages(mapping, 0);
}	
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EXPORT_SYMBOL(kill_bdev);

/* Invalidate clean unused buffers and pagecache. */


void invalidate_bdev(struct block_device *bdev)
{
	struct address_space *mapping = bdev->bd_inode->i_mapping;

	if (mapping->nrpages == 0)
		return;

	invalidate_bh_lrus();
	lru_add_drain_all();	/* make sure all lru add caches are flushed */
	invalidate_mapping_pages(mapping, 0, -1);
	/* 99% of the time, we don't need to flush the cleancache on the bdev.
         * But, for the strange corners, lets be cautious
         */
	cleancache_invalidate_inode(mapping);
}
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EXPORT_SYMBOL(invalidate_bdev);



int set_blocksize(struct block_device *bdev, int size)
{
	/* Size must be a power of two, and between 512 and PAGE_SIZE */
	if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size))
		return -EINVAL;

	/* Size cannot be smaller than the size supported by the device */
	if (size < bdev_logical_block_size(bdev))
		return -EINVAL;

	/* Don't change the size if it is same as current */
	if (bdev->bd_block_size != size) {
		sync_blockdev(bdev);
		bdev->bd_block_size = size;
		bdev->bd_inode->i_blkbits = blksize_bits(size);
		kill_bdev(bdev);
	}
	return 0;
}

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EXPORT_SYMBOL(set_blocksize);



int sb_set_blocksize(struct super_block *sb, int size)
{
	if (set_blocksize(sb->s_bdev, size))
		return 0;
	/* If we get here, we know size is power of two
         * and it's value is between 512 and PAGE_SIZE */
	sb->s_blocksize = size;
	sb->s_blocksize_bits = blksize_bits(size);
	return sb->s_blocksize;
}

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EXPORT_SYMBOL(sb_set_blocksize);



int sb_min_blocksize(struct super_block *sb, int size)
{
	int minsize = bdev_logical_block_size(sb->s_bdev);
	if (size < minsize)
		size = minsize;
	return sb_set_blocksize(sb, size);
}

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EXPORT_SYMBOL(sb_min_blocksize);


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;
}

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static struct inode *bdev_file_inode(struct file *file)
{
	return file->f_mapping->host;
}

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static unsigned int dio_bio_write_op(struct kiocb *iocb)
{
	unsigned int op = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE;

	/* avoid the need for a I/O completion work item */
	if (iocb->ki_flags & IOCB_DSYNC)
		op |= REQ_FUA;
	return op;
}

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#define DIO_INLINE_BIO_VECS 4



static void blkdev_bio_end_io_simple(struct bio *bio)
{
	struct task_struct *waiter = bio->bi_private;

	WRITE_ONCE(bio->bi_private, NULL);
	wake_up_process(waiter);
}

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static ssize_t

__blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
		int nr_pages)
{
	struct file *file = iocb->ki_filp;
	struct block_device *bdev = I_BDEV(bdev_file_inode(file));
	struct bio_vec inline_vecs[DIO_INLINE_BIO_VECS], *vecs, *bvec;
	loff_t pos = iocb->ki_pos;
	bool should_dirty = false;
	struct bio bio;
	ssize_t ret;
	blk_qc_t qc;
	int i;

	if ((pos | iov_iter_alignment(iter)) &
	    (bdev_logical_block_size(bdev) - 1))
		return -EINVAL;

	if (nr_pages <= DIO_INLINE_BIO_VECS)
		vecs = inline_vecs;
	else {
		vecs = kmalloc(nr_pages * sizeof(struct bio_vec), GFP_KERNEL);
		if (!vecs)
			return -ENOMEM;
	}

	bio_init(&bio, vecs, nr_pages);
	bio.bi_bdev = bdev;
	bio.bi_iter.bi_sector = pos >> 9;
	bio.bi_private = current;
	bio.bi_end_io = blkdev_bio_end_io_simple;

	ret = bio_iov_iter_get_pages(&bio, iter);
	if (unlikely(ret))
		return ret;
	ret = bio.bi_iter.bi_size;

	if (iov_iter_rw(iter) == READ) {
		bio.bi_opf = REQ_OP_READ;
		if (iter_is_iovec(iter))
			should_dirty = true;
	} else {
		bio.bi_opf = dio_bio_write_op(iocb);
		task_io_account_write(ret);
	}

	qc = submit_bio(&bio);
	for (;;) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		if (!READ_ONCE(bio.bi_private))
			break;
		if (!(iocb->ki_flags & IOCB_HIPRI) ||
		    !blk_mq_poll(bdev_get_queue(bdev), qc))
			io_schedule();
	}
	__set_current_state(TASK_RUNNING);

	bio_for_each_segment_all(bvec, &bio, i) {
		if (should_dirty && !PageCompound(bvec->bv_page))
			set_page_dirty_lock(bvec->bv_page);
		put_page(bvec->bv_page);
	}

	if (vecs != inline_vecs)
		kfree(vecs);

	if (unlikely(bio.bi_error))
		return bio.bi_error;
	return ret;
}

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struct blkdev_dio {
	union {
		
struct kiocb		*iocb;
		
struct task_struct	*waiter;
	};
	
size_t			size;
	
atomic_t		ref;
	
bool			multi_bio : 1;
	
bool			should_dirty : 1;
	
bool			is_sync : 1;
	
struct bio		bio;
};


static struct bio_set *blkdev_dio_pool __read_mostly;



static void blkdev_bio_end_io(struct bio *bio)
{
	struct blkdev_dio *dio = bio->bi_private;
	bool should_dirty = dio->should_dirty;

	if (dio->multi_bio && !atomic_dec_and_test(&dio->ref)) {
		if (bio->bi_error && !dio->bio.bi_error)
			dio->bio.bi_error = bio->bi_error;
	} else {
		if (!dio->is_sync) {
			struct kiocb *iocb = dio->iocb;
			ssize_t ret = dio->bio.bi_error;

			if (likely(!ret)) {
				ret = dio->size;
				iocb->ki_pos += ret;
			}

			dio->iocb->ki_complete(iocb, ret, 0);
			bio_put(&dio->bio);
		} else {
			struct task_struct *waiter = dio->waiter;

			WRITE_ONCE(dio->waiter, NULL);
			wake_up_process(waiter);
		}
	}

	if (should_dirty) {
		bio_check_pages_dirty(bio);
	} else {
		struct bio_vec *bvec;
		int i;

		bio_for_each_segment_all(bvec, bio, i)
			put_page(bvec->bv_page);
		bio_put(bio);
	}
}

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static ssize_t

__blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = bdev_file_inode(file);
	struct block_device *bdev = I_BDEV(inode);
	struct blk_plug plug;
	struct blkdev_dio *dio;
	struct bio *bio;
	bool is_read = (iov_iter_rw(iter) == READ), is_sync;
	loff_t pos = iocb->ki_pos;
	blk_qc_t qc = BLK_QC_T_NONE;
	int ret;

	if ((pos | iov_iter_alignment(iter)) &
	    (bdev_logical_block_size(bdev) - 1))
		return -EINVAL;

	bio = bio_alloc_bioset(GFP_KERNEL, nr_pages, blkdev_dio_pool);
	bio_get(bio); /* extra ref for the completion handler */

	dio = container_of(bio, struct blkdev_dio, bio);
	dio->is_sync = is_sync = is_sync_kiocb(iocb);
	if (dio->is_sync)
		dio->waiter = current;
	else
		dio->iocb = iocb;

	dio->size = 0;
	dio->multi_bio = false;
	dio->should_dirty = is_read && (iter->type == ITER_IOVEC);

	blk_start_plug(&plug);
	for (;;) {
		bio->bi_bdev = bdev;
		bio->bi_iter.bi_sector = pos >> 9;
		bio->bi_private = dio;
		bio->bi_end_io = blkdev_bio_end_io;

		ret = bio_iov_iter_get_pages(bio, iter);
		if (unlikely(ret)) {
			bio->bi_error = ret;
			bio_endio(bio);
			break;
		}

		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);
		}

		dio->size += bio->bi_iter.bi_size;
		pos += bio->bi_iter.bi_size;

		nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES);
		if (!nr_pages) {
			qc = submit_bio(bio);
			break;
		}

		if (!dio->multi_bio) {
			dio->multi_bio = true;
			atomic_set(&dio->ref, 2);
		} else {
			atomic_inc(&dio->ref);
		}

		submit_bio(bio);
		bio = bio_alloc(GFP_KERNEL, nr_pages);
	}
	blk_finish_plug(&plug);

	if (!is_sync)
		return -EIOCBQUEUED;

	for (;;) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		if (!READ_ONCE(dio->waiter))
			break;

		if (!(iocb->ki_flags & IOCB_HIPRI) ||
		    !blk_mq_poll(bdev_get_queue(bdev), qc))
			io_schedule();
	}
	__set_current_state(TASK_RUNNING);

	ret = dio->bio.bi_error;
	if (likely(!ret))
		ret = dio->size;

	bio_put(&dio->bio);
	return ret;
}

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static ssize_t

blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
	int nr_pages;

	nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES + 1);
	if (!nr_pages)
		return 0;
	if (is_sync_kiocb(iocb) && nr_pages <= BIO_MAX_PAGES)
		return __blkdev_direct_IO_simple(iocb, iter, nr_pages);

	return __blkdev_direct_IO(iocb, iter, min(nr_pages, BIO_MAX_PAGES));
}

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linus torvalds
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static __init int blkdev_init(void)
{
	blkdev_dio_pool = bioset_create(4, offsetof(struct blkdev_dio, bio));
	if (!blkdev_dio_pool)
		return -ENOMEM;
	return 0;
}
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module_init(blkdev_init);



int __sync_blockdev(struct block_device *bdev, int wait)
{
	if (!bdev)
		return 0;
	if (!wait)
		return filemap_flush(bdev->bd_inode->i_mapping);
	return filemap_write_and_wait(bdev->bd_inode->i_mapping);
}

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/*
 * Write out and wait upon all the dirty data associated with a block
 * device via its mapping.  Does not take the superblock lock.
 */


int sync_blockdev(struct block_device *bdev)
{
	return __sync_blockdev(bdev, 1);
}
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EXPORT_SYMBOL(sync_blockdev);

/*
 * Write out and wait upon all dirty data associated with this
 * device.   Filesystem data as well as the underlying block
 * device.  Takes the superblock lock.
 */


int fsync_bdev(struct block_device *bdev)
{
	struct super_block *sb = get_super(bdev);
	if (sb) {
		int res = sync_filesystem(sb);
		drop_super(sb);
		return res;
	}
	return sync_blockdev(bdev);
}
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EXPORT_SYMBOL(fsync_bdev);

/**
 * freeze_bdev  --  lock a filesystem and force it into a consistent state
 * @bdev:       blockdevice to lock
 *
 * If a superblock is found on this device, we take the s_umount semaphore
 * on it to make sure nobody unmounts until the snapshot creation is done.
 * The reference counter (bd_fsfreeze_count) guarantees that only the last
 * unfreeze process can unfreeze the frozen filesystem actually when multiple
 * freeze requests arrive simultaneously. It counts up in freeze_bdev() and
 * count down in thaw_bdev(). When it becomes 0, thaw_bdev() will unfreeze
 * actually.
 */


struct super_block *freeze_bdev(struct block_device *bdev)
{
	struct super_block *sb;
	int error = 0;

	mutex_lock(&bdev->bd_fsfreeze_mutex);
	if (++bdev->bd_fsfreeze_count > 1) {
		/*
                 * We don't even need to grab a reference - the first call
                 * to freeze_bdev grab an active reference and only the last
                 * thaw_bdev drops it.
                 */
		sb = get_super(bdev);
		if (sb)
			drop_super(sb);
		mutex_unlock(&bdev->bd_fsfreeze_mutex);
		return sb;
	}

	sb = get_active_super(bdev);
	if (!sb)
		goto out;
	if (sb->s_op->freeze_super)
		error = sb->s_op->freeze_super(sb);
	else
		error = freeze_super(sb);
	if (error) {
		deactivate_super(sb);
		bdev->bd_fsfreeze_count--;
		mutex_unlock(&bdev->bd_fsfreeze_mutex);
		return ERR_PTR(error);
	}
	deactivate_super(sb);
 out:
	sync_blockdev(bdev);
	mutex_unlock(&bdev->bd_fsfreeze_mutex);
	return sb;	/* thaw_bdev releases s->s_umount */
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
nick piggin
nick piggin
117
70.91%
1
16.67%
christoph hellwig
christoph hellwig
21
12.73%
2
33.33%
benjamin marzinski
benjamin marzinski
20
12.12%
1
16.67%
andrey ryabinin
andrey ryabinin
4
2.42%
1
16.67%
josef bacik
josef bacik
3
1.82%
1
16.67%
Total
165
100.00%
6
100.00%


EXPORT_SYMBOL(freeze_bdev);

/**
 * thaw_bdev  -- unlock filesystem
 * @bdev:       blockdevice to unlock
 * @sb:         associated superblock
 *
 * Unlocks the filesystem and marks it writeable again after freeze_bdev().
 */


int thaw_bdev(struct block_device *bdev, struct super_block *sb)
{
	int error = -EINVAL;

	mutex_lock(&bdev->bd_fsfreeze_mutex);
	if (!bdev->bd_fsfreeze_count)
		goto out;

	error = 0;
	if (--bdev->bd_fsfreeze_count > 0)
		goto out;

	if (!sb)
		goto out;

	if (sb->s_op->thaw_super)
		error = sb->s_op->thaw_super(sb);
	else
		error = thaw_super(sb);
	if (error)
		bdev->bd_fsfreeze_count++;
out:
	mutex_unlock(&bdev->bd_fsfreeze_mutex);
	return error;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
nick piggin
nick piggin
72
64.29%
1
20.00%
benjamin marzinski
benjamin marzinski
20
17.86%
1
20.00%
christoph hellwig
christoph hellwig
14
12.50%
1
20.00%
josef bacik
josef bacik
5
4.46%
1
20.00%
pierre morel
pierre morel
1
0.89%
1
20.00%
Total
112
100.00%
5
100.00%


EXPORT_SYMBOL(thaw_bdev);



static int blkdev_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, blkdev_get_block, wbc);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
19
73.08%
2
66.67%
andrew morton
andrew morton
7
26.92%
1
33.33%
Total
26
100.00%
3
100.00%



static int blkdev_readpage(struct file * file, struct page * page)
{
	return block_read_full_page(page, blkdev_get_block);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
20
83.33%
2
50.00%
pre-git
pre-git
4
16.67%
2
50.00%
Total
24
100.00%
4
100.00%



static int blkdev_readpages(struct file *file, struct address_space *mapping,
			struct list_head *pages, unsigned nr_pages)
{
	return mpage_readpages(mapping, pages, nr_pages, blkdev_get_block);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
akinobu mita
akinobu mita
36
100.00%
1
100.00%
Total
36
100.00%
1
100.00%



static int blkdev_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	return block_write_begin(mapping, pos, len, flags, pagep,
				 blkdev_get_block);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
nick piggin
nick piggin
28
53.85%
1
16.67%
linus torvalds
linus torvalds
21
40.38%
3
50.00%
pre-git
pre-git
2
3.85%
1
16.67%
christoph hellwig
christoph hellwig
1
1.92%
1
16.67%
Total
52
100.00%
6
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
nick piggin
nick piggin
46
66.67%
1
25.00%
linus torvalds
linus torvalds
20
28.99%
1
25.00%
pre-git
pre-git
2
2.90%
1
25.00%
kirill a. shutemov
kirill a. shutemov
1
1.45%
1
25.00%
Total
69
100.00%
4
100.00%

/*
 * private llseek:
 * 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 block_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;
}
	
Contributors
Person
Tokens
Prop
Commits
CommitProp
andrew morton
andrew morton
22
37.29%
4
40.00%
pre-git
pre-git
19
32.20%
1
10.00%
al viro
al viro
12
20.34%
2
20.00%
dan williams
dan williams
3
5.08%
1
10.00%
linus torvalds
linus torvalds
3
5.08%
2
20.00%
Total
59
100.00%
10
100.00%



int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
	struct inode *bd_inode = bdev_file_inode(filp);
	struct block_device *bdev = I_BDEV(bd_inode);
	int error;
	
	error = filemap_write_and_wait_range(filp->f_mapping, 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, GFP_KERNEL, NULL);
	if (error == -EOPNOTSUPP)
		error = 0;

	return error;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
christoph hellwig
christoph hellwig
29
32.95%
1
9.09%
rafael j. wysocki
rafael j. wysocki
20
22.73%
1
9.09%
pre-git
pre-git
13
14.77%
3
27.27%
anton blanchard
anton blanchard
12
13.64%
1
9.09%
josef bacik
josef bacik
6
6.82%
1
9.09%
andrew morton
andrew morton
3
3.41%
2
18.18%
dan williams
dan williams
3
3.41%
1
9.09%
dmitriy monakhov
dmitriy monakhov
2
2.27%
1
9.09%
Total
88
100.00%
11
100.00%


EXPORT_SYMBOL(blkdev_fsync);

/**
 * bdev_read_page() - Start reading a page from a block device
 * @bdev: The device to read the page from
 * @sector: The offset on the device to read the page to (need not be aligned)
 * @page: The page to read
 *
 * On entry, the page should be locked.  It will be unlocked when the page
 * has been read.  If the block driver implements rw_page synchronously,
 * that will be true on exit from this function, but it need not be.
 *
 * Errors returned by this function are usually "soft", eg out of memory, or
 * queue full; callers should try a different route to read this page rather
 * than propagate an error back up the stack.
 *
 * Return: negative errno if an error occurs, 0 if submission was successful.
 */


int bdev_read_page(struct block_device *bdev, sector_t sector,
			struct page *page)
{
	const struct block_device_operations *ops = bdev->bd_disk->fops;
	int result = -EOPNOTSUPP;

	if (!ops->rw_page || bdev_get_integrity(bdev))
		return result;

	result = blk_queue_enter(bdev->bd_queue, false);
	if (result)
		return result;
	result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, false