Contributors: 67
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Christoph Hellwig |
2215 |
55.11% |
66 |
25.19% |
| Linus Torvalds |
226 |
5.62% |
16 |
6.11% |
| Jan Kara |
218 |
5.42% |
7 |
2.67% |
| Al Viro |
181 |
4.50% |
24 |
9.16% |
| Linus Torvalds (pre-git) |
109 |
2.71% |
24 |
9.16% |
| Andrew Morton |
107 |
2.66% |
19 |
7.25% |
| Nicholas Piggin |
81 |
2.02% |
2 |
0.76% |
| David Chinner |
76 |
1.89% |
3 |
1.15% |
| Jens Axboe |
73 |
1.82% |
14 |
5.34% |
| David Howells |
65 |
1.62% |
5 |
1.91% |
| Darrick J. Wong |
65 |
1.62% |
2 |
0.76% |
| Tejun Heo |
58 |
1.44% |
10 |
3.82% |
| Ming Lei |
57 |
1.42% |
2 |
0.76% |
| Eric Biggers |
54 |
1.34% |
1 |
0.38% |
| Matthew Wilcox |
41 |
1.02% |
5 |
1.91% |
| Dan J Williams |
38 |
0.95% |
2 |
0.76% |
| Peter Zijlstra |
34 |
0.85% |
3 |
1.15% |
| Maxim Mikityanskiy |
29 |
0.72% |
1 |
0.38% |
| Vivek Goyal |
29 |
0.72% |
1 |
0.38% |
| Rabin Vincent |
26 |
0.65% |
1 |
0.38% |
| Arnaldo Carvalho de Melo |
24 |
0.60% |
2 |
0.76% |
| yangerkun |
23 |
0.57% |
1 |
0.38% |
| Pavel Begunkov |
15 |
0.37% |
3 |
1.15% |
| Benjamin Marzinski |
14 |
0.35% |
1 |
0.38% |
| Jean Noel Cordenner |
12 |
0.30% |
1 |
0.38% |
| Yuezhang.Mo |
9 |
0.22% |
1 |
0.38% |
| Stefan Behrens |
8 |
0.20% |
1 |
0.38% |
| Neil Brown |
7 |
0.17% |
1 |
0.38% |
| Mika Kukkonen |
7 |
0.17% |
1 |
0.38% |
| Jianpeng Ma |
7 |
0.17% |
1 |
0.38% |
| Tetsuo Handa |
6 |
0.15% |
1 |
0.38% |
| Eric W. Biedermann |
5 |
0.12% |
1 |
0.38% |
| Shaohua Li |
5 |
0.12% |
1 |
0.38% |
| Chris Mason |
5 |
0.12% |
1 |
0.38% |
| Takashi Sato |
5 |
0.12% |
1 |
0.38% |
| Chuck Ebbert |
5 |
0.12% |
1 |
0.38% |
| Martin Wilck |
5 |
0.12% |
1 |
0.38% |
| Jan Blunck |
4 |
0.10% |
2 |
0.76% |
| Coywolf Qi Hunt |
4 |
0.10% |
1 |
0.38% |
| Paul Jackson |
4 |
0.10% |
2 |
0.76% |
| Damien Le Moal |
4 |
0.10% |
2 |
0.76% |
| Rusty Russell |
4 |
0.10% |
1 |
0.38% |
| Doug Anderson |
4 |
0.10% |
1 |
0.38% |
| Vignesh Babu |
4 |
0.10% |
1 |
0.38% |
| Akinobu Mita |
4 |
0.10% |
1 |
0.38% |
| Pavel Emelyanov |
3 |
0.07% |
1 |
0.38% |
| Muthu Kumar |
3 |
0.07% |
1 |
0.38% |
| Ross Zwisler |
3 |
0.07% |
1 |
0.38% |
| Satya Tangirala |
3 |
0.07% |
1 |
0.38% |
| Kenneth W Chen |
3 |
0.07% |
1 |
0.38% |
| Song Muchun |
3 |
0.07% |
1 |
0.38% |
| Randy Dunlap |
3 |
0.07% |
2 |
0.76% |
| Rafael J. Wysocki |
3 |
0.07% |
1 |
0.38% |
| Andrey Ryabinin |
2 |
0.05% |
1 |
0.38% |
| Martin K. Petersen |
2 |
0.05% |
1 |
0.38% |
| Domenico Andreoli |
2 |
0.05% |
1 |
0.38% |
| Vladimir Davydov |
2 |
0.05% |
1 |
0.38% |
| Adam Manzanares |
2 |
0.05% |
1 |
0.38% |
| Thomas Gleixner |
1 |
0.02% |
1 |
0.38% |
| zhengbin |
1 |
0.02% |
1 |
0.38% |
| Bart Van Assche |
1 |
0.02% |
1 |
0.38% |
| Lei Ming |
1 |
0.02% |
1 |
0.38% |
| Vishal Verma |
1 |
0.02% |
1 |
0.38% |
| Anton Blanchard |
1 |
0.02% |
1 |
0.38% |
| Josef Bacik |
1 |
0.02% |
1 |
0.38% |
| Kent Overstreet |
1 |
0.02% |
1 |
0.38% |
| Jun'ichi Nomura |
1 |
0.02% |
1 |
0.38% |
| Total |
4019 |
|
262 |
|
// 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/slab.h>
#include <linux/kmod.h>
#include <linux/major.h>
#include <linux/device_cgroup.h>
#include <linux/blkdev.h>
#include <linux/blk-integrity.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/writeback.h>
#include <linux/mount.h>
#include <linux/pseudo_fs.h>
#include <linux/uio.h>
#include <linux/namei.h>
#include <linux/part_stat.h>
#include <linux/uaccess.h>
#include <linux/stat.h>
#include "../fs/internal.h"
#include "blk.h"
struct bdev_inode {
struct block_device bdev;
struct inode vfs_inode;
};
static inline struct bdev_inode *BDEV_I(struct inode *inode)
{
return container_of(inode, struct bdev_inode, vfs_inode);
}
struct block_device *I_BDEV(struct inode *inode)
{
return &BDEV_I(inode)->bdev;
}
EXPORT_SYMBOL(I_BDEV);
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)
pr_warn_ratelimited(
"VFS: Dirty inode writeback failed for block device %pg (err=%d).\n",
bdev, ret);
spin_lock(&inode->i_lock);
}
spin_unlock(&inode->i_lock);
}
/* Kill _all_ buffers and pagecache , dirty or not.. */
static void kill_bdev(struct block_device *bdev)
{
struct address_space *mapping = bdev->bd_inode->i_mapping;
if (mapping_empty(mapping))
return;
invalidate_bh_lrus();
truncate_inode_pages(mapping, 0);
}
/* 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) {
invalidate_bh_lrus();
lru_add_drain_all(); /* make sure all lru add caches are flushed */
invalidate_mapping_pages(mapping, 0, -1);
}
}
EXPORT_SYMBOL(invalidate_bdev);
/*
* Drop all buffers & page cache for given bdev range. This function bails
* with error if bdev has other exclusive owner (such as filesystem).
*/
int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode,
loff_t lstart, loff_t lend)
{
/*
* If we don't hold exclusive handle for the device, upgrade to it
* while we discard the buffer cache to avoid discarding buffers
* under live filesystem.
*/
if (!(mode & BLK_OPEN_EXCL)) {
int err = bd_prepare_to_claim(bdev, truncate_bdev_range, NULL);
if (err)
goto invalidate;
}
truncate_inode_pages_range(bdev->bd_inode->i_mapping, lstart, lend);
if (!(mode & BLK_OPEN_EXCL))
bd_abort_claiming(bdev, truncate_bdev_range);
return 0;
invalidate:
/*
* Someone else has handle exclusively open. Try invalidating instead.
* The 'end' argument is inclusive so the rounding is safe.
*/
return invalidate_inode_pages2_range(bdev->bd_inode->i_mapping,
lstart >> PAGE_SHIFT,
lend >> PAGE_SHIFT);
}
static void set_init_blocksize(struct block_device *bdev)
{
unsigned int bsize = bdev_logical_block_size(bdev);
loff_t size = i_size_read(bdev->bd_inode);
while (bsize < PAGE_SIZE) {
if (size & bsize)
break;
bsize <<= 1;
}
bdev->bd_inode->i_blkbits = blksize_bits(bsize);
}
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_inode->i_blkbits != blksize_bits(size)) {
sync_blockdev(bdev);
bdev->bd_inode->i_blkbits = blksize_bits(size);
kill_bdev(bdev);
}
return 0;
}
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;
}
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);
}
EXPORT_SYMBOL(sb_min_blocksize);
int sync_blockdev_nowait(struct block_device *bdev)
{
if (!bdev)
return 0;
return filemap_flush(bdev->bd_inode->i_mapping);
}
EXPORT_SYMBOL_GPL(sync_blockdev_nowait);
/*
* 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)
{
if (!bdev)
return 0;
return filemap_write_and_wait(bdev->bd_inode->i_mapping);
}
EXPORT_SYMBOL(sync_blockdev);
int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend)
{
return filemap_write_and_wait_range(bdev->bd_inode->i_mapping,
lstart, lend);
}
EXPORT_SYMBOL(sync_blockdev_range);
/*
* 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);
}
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.
*/
int 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)
goto done;
sb = get_active_super(bdev);
if (!sb)
goto sync;
if (sb->s_op->freeze_super)
error = sb->s_op->freeze_super(sb);
else
error = freeze_super(sb);
deactivate_super(sb);
if (error) {
bdev->bd_fsfreeze_count--;
goto done;
}
bdev->bd_fsfreeze_sb = sb;
sync:
sync_blockdev(bdev);
done:
mutex_unlock(&bdev->bd_fsfreeze_mutex);
return error;
}
EXPORT_SYMBOL(freeze_bdev);
/**
* thaw_bdev - unlock filesystem
* @bdev: blockdevice to unlock
*
* 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;
sb = bdev->bd_fsfreeze_sb;
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++;
else
bdev->bd_fsfreeze_sb = NULL;
out:
mutex_unlock(&bdev->bd_fsfreeze_mutex);
return error;
}
EXPORT_SYMBOL(thaw_bdev);
/*
* pseudo-fs
*/
static __cacheline_aligned_in_smp DEFINE_MUTEX(bdev_lock);
static struct kmem_cache * bdev_cachep __read_mostly;
static struct inode *bdev_alloc_inode(struct super_block *sb)
{
struct bdev_inode *ei = alloc_inode_sb(sb, bdev_cachep, GFP_KERNEL);
if (!ei)
return NULL;
memset(&ei->bdev, 0, sizeof(ei->bdev));
return &ei->vfs_inode;
}
static void bdev_free_inode(struct inode *inode)
{
struct block_device *bdev = I_BDEV(inode);
free_percpu(bdev->bd_stats);
kfree(bdev->bd_meta_info);
if (!bdev_is_partition(bdev)) {
if (bdev->bd_disk && bdev->bd_disk->bdi)
bdi_put(bdev->bd_disk->bdi);
kfree(bdev->bd_disk);
}
if (MAJOR(bdev->bd_dev) == BLOCK_EXT_MAJOR)
blk_free_ext_minor(MINOR(bdev->bd_dev));
kmem_cache_free(bdev_cachep, BDEV_I(inode));
}
static void init_once(void *data)
{
struct bdev_inode *ei = data;
inode_init_once(&ei->vfs_inode);
}
static void bdev_evict_inode(struct inode *inode)
{
truncate_inode_pages_final(&inode->i_data);
invalidate_inode_buffers(inode); /* is it needed here? */
clear_inode(inode);
}
static const struct super_operations bdev_sops = {
.statfs = simple_statfs,
.alloc_inode = bdev_alloc_inode,
.free_inode = bdev_free_inode,
.drop_inode = generic_delete_inode,
.evict_inode = bdev_evict_inode,
};
static int bd_init_fs_context(struct fs_context *fc)
{
struct pseudo_fs_context *ctx = init_pseudo(fc, BDEVFS_MAGIC);
if (!ctx)
return -ENOMEM;
fc->s_iflags |= SB_I_CGROUPWB;
ctx->ops = &bdev_sops;
return 0;
}
static struct file_system_type bd_type = {
.name = "bdev",
.init_fs_context = bd_init_fs_context,
.kill_sb = kill_anon_super,
};
struct super_block *blockdev_superblock __read_mostly;
EXPORT_SYMBOL_GPL(blockdev_superblock);
void __init bdev_cache_init(void)
{
int err;
static struct vfsmount *bd_mnt;
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode),
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD|SLAB_ACCOUNT|SLAB_PANIC),
init_once);
err = register_filesystem(&bd_type);
if (err)
panic("Cannot register bdev pseudo-fs");
bd_mnt = kern_mount(&bd_type);
if (IS_ERR(bd_mnt))
panic("Cannot create bdev pseudo-fs");
blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */
}
struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
{
struct block_device *bdev;
struct inode *inode;
inode = new_inode(blockdev_superblock);
if (!inode)
return NULL;
inode->i_mode = S_IFBLK;
inode->i_rdev = 0;
inode->i_data.a_ops = &def_blk_aops;
mapping_set_gfp_mask(&inode->i_data, GFP_USER);
bdev = I_BDEV(inode);
mutex_init(&bdev->bd_fsfreeze_mutex);
spin_lock_init(&bdev->bd_size_lock);
mutex_init(&bdev->bd_holder_lock);
bdev->bd_partno = partno;
bdev->bd_inode = inode;
bdev->bd_queue = disk->queue;
if (partno)
bdev->bd_has_submit_bio = disk->part0->bd_has_submit_bio;
else
bdev->bd_has_submit_bio = false;
bdev->bd_stats = alloc_percpu(struct disk_stats);
if (!bdev->bd_stats) {
iput(inode);
return NULL;
}
bdev->bd_disk = disk;
return bdev;
}
void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors)
{
spin_lock(&bdev->bd_size_lock);
i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT);
bdev->bd_nr_sectors = sectors;
spin_unlock(&bdev->bd_size_lock);
}
void bdev_add(struct block_device *bdev, dev_t dev)
{
bdev->bd_dev = dev;
bdev->bd_inode->i_rdev = dev;
bdev->bd_inode->i_ino = dev;
insert_inode_hash(bdev->bd_inode);
}
long nr_blockdev_pages(void)
{
struct inode *inode;
long ret = 0;
spin_lock(&blockdev_superblock->s_inode_list_lock);
list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list)
ret += inode->i_mapping->nrpages;
spin_unlock(&blockdev_superblock->s_inode_list_lock);
return ret;
}
/**
* bd_may_claim - test whether a block device can be claimed
* @bdev: block device of interest
* @holder: holder trying to claim @bdev
* @hops: holder ops
*
* Test whether @bdev can be claimed by @holder.
*
* RETURNS:
* %true if @bdev can be claimed, %false otherwise.
*/
static bool bd_may_claim(struct block_device *bdev, void *holder,
const struct blk_holder_ops *hops)
{
struct block_device *whole = bdev_whole(bdev);
lockdep_assert_held(&bdev_lock);
if (bdev->bd_holder) {
/*
* The same holder can always re-claim.
*/
if (bdev->bd_holder == holder) {
if (WARN_ON_ONCE(bdev->bd_holder_ops != hops))
return false;
return true;
}
return false;
}
/*
* If the whole devices holder is set to bd_may_claim, a partition on
* the device is claimed, but not the whole device.
*/
if (whole != bdev &&
whole->bd_holder && whole->bd_holder != bd_may_claim)
return false;
return true;
}
/**
* bd_prepare_to_claim - claim a block device
* @bdev: block device of interest
* @holder: holder trying to claim @bdev
* @hops: holder ops.
*
* Claim @bdev. This function fails if @bdev is already claimed by another
* holder and waits if another claiming is in progress. return, the caller
* has ownership of bd_claiming and bd_holder[s].
*
* RETURNS:
* 0 if @bdev can be claimed, -EBUSY otherwise.
*/
int bd_prepare_to_claim(struct block_device *bdev, void *holder,
const struct blk_holder_ops *hops)
{
struct block_device *whole = bdev_whole(bdev);
if (WARN_ON_ONCE(!holder))
return -EINVAL;
retry:
mutex_lock(&bdev_lock);
/* if someone else claimed, fail */
if (!bd_may_claim(bdev, holder, hops)) {
mutex_unlock(&bdev_lock);
return -EBUSY;
}
/* if claiming is already in progress, wait for it to finish */
if (whole->bd_claiming) {
wait_queue_head_t *wq = bit_waitqueue(&whole->bd_claiming, 0);
DEFINE_WAIT(wait);
prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE);
mutex_unlock(&bdev_lock);
schedule();
finish_wait(wq, &wait);
goto retry;
}
/* yay, all mine */
whole->bd_claiming = holder;
mutex_unlock(&bdev_lock);
return 0;
}
EXPORT_SYMBOL_GPL(bd_prepare_to_claim); /* only for the loop driver */
static void bd_clear_claiming(struct block_device *whole, void *holder)
{
lockdep_assert_held(&bdev_lock);
/* tell others that we're done */
BUG_ON(whole->bd_claiming != holder);
whole->bd_claiming = NULL;
wake_up_bit(&whole->bd_claiming, 0);
}
/**
* bd_finish_claiming - finish claiming of a block device
* @bdev: block device of interest
* @holder: holder that has claimed @bdev
* @hops: block device holder operations
*
* Finish exclusive open of a block device. Mark the device as exlusively
* open by the holder and wake up all waiters for exclusive open to finish.
*/
static void bd_finish_claiming(struct block_device *bdev, void *holder,
const struct blk_holder_ops *hops)
{
struct block_device *whole = bdev_whole(bdev);
mutex_lock(&bdev_lock);
BUG_ON(!bd_may_claim(bdev, holder, hops));
/*
* Note that for a whole device bd_holders will be incremented twice,
* and bd_holder will be set to bd_may_claim before being set to holder
*/
whole->bd_holders++;
whole->bd_holder = bd_may_claim;
bdev->bd_holders++;
mutex_lock(&bdev->bd_holder_lock);
bdev->bd_holder = holder;
bdev->bd_holder_ops = hops;
mutex_unlock(&bdev->bd_holder_lock);
bd_clear_claiming(whole, holder);
mutex_unlock(&bdev_lock);
}
/**
* bd_abort_claiming - abort claiming of a block device
* @bdev: block device of interest
* @holder: holder that has claimed @bdev
*
* Abort claiming of a block device when the exclusive open failed. This can be
* also used when exclusive open is not actually desired and we just needed
* to block other exclusive openers for a while.
*/
void bd_abort_claiming(struct block_device *bdev, void *holder)
{
mutex_lock(&bdev_lock);
bd_clear_claiming(bdev_whole(bdev), holder);
mutex_unlock(&bdev_lock);
}
EXPORT_SYMBOL(bd_abort_claiming);
static void bd_end_claim(struct block_device *bdev, void *holder)
{
struct block_device *whole = bdev_whole(bdev);
bool unblock = false;
/*
* Release a claim on the device. The holder fields are protected with
* bdev_lock. open_mutex is used to synchronize disk_holder unlinking.
*/
mutex_lock(&bdev_lock);
WARN_ON_ONCE(bdev->bd_holder != holder);
WARN_ON_ONCE(--bdev->bd_holders < 0);
WARN_ON_ONCE(--whole->bd_holders < 0);
if (!bdev->bd_holders) {
mutex_lock(&bdev->bd_holder_lock);
bdev->bd_holder = NULL;
bdev->bd_holder_ops = NULL;
mutex_unlock(&bdev->bd_holder_lock);
if (bdev->bd_write_holder)
unblock = true;
}
if (!whole->bd_holders)
whole->bd_holder = NULL;
mutex_unlock(&bdev_lock);
/*
* If this was the last claim, remove holder link and unblock evpoll if
* it was a write holder.
*/
if (unblock) {
disk_unblock_events(bdev->bd_disk);
bdev->bd_write_holder = false;
}
}
static void blkdev_flush_mapping(struct block_device *bdev)
{
WARN_ON_ONCE(bdev->bd_holders);
sync_blockdev(bdev);
kill_bdev(bdev);
bdev_write_inode(bdev);
}
static int blkdev_get_whole(struct block_device *bdev, blk_mode_t mode)
{
struct gendisk *disk = bdev->bd_disk;
int ret;
if (disk->fops->open) {
ret = disk->fops->open(disk, mode);
if (ret) {
/* avoid ghost partitions on a removed medium */
if (ret == -ENOMEDIUM &&
test_bit(GD_NEED_PART_SCAN, &disk->state))
bdev_disk_changed(disk, true);
return ret;
}
}
if (!atomic_read(&bdev->bd_openers))
set_init_blocksize(bdev);
if (test_bit(GD_NEED_PART_SCAN, &disk->state))
bdev_disk_changed(disk, false);
atomic_inc(&bdev->bd_openers);
return 0;
}
static void blkdev_put_whole(struct block_device *bdev)
{
if (atomic_dec_and_test(&bdev->bd_openers))
blkdev_flush_mapping(bdev);
if (bdev->bd_disk->fops->release)
bdev->bd_disk->fops->release(bdev->bd_disk);
}
static int blkdev_get_part(struct block_device *part, blk_mode_t mode)
{
struct gendisk *disk = part->bd_disk;
int ret;
ret = blkdev_get_whole(bdev_whole(part), mode);
if (ret)
return ret;
ret = -ENXIO;
if (!bdev_nr_sectors(part))
goto out_blkdev_put;
if (!atomic_read(&part->bd_openers)) {
disk->open_partitions++;
set_init_blocksize(part);
}
atomic_inc(&part->bd_openers);
return 0;
out_blkdev_put:
blkdev_put_whole(bdev_whole(part));
return ret;
}
static void blkdev_put_part(struct block_device *part)
{
struct block_device *whole = bdev_whole(part);
if (atomic_dec_and_test(&part->bd_openers)) {
blkdev_flush_mapping(part);
whole->bd_disk->open_partitions--;
}
blkdev_put_whole(whole);
}
struct block_device *blkdev_get_no_open(dev_t dev)
{
struct block_device *bdev;
struct inode *inode;
inode = ilookup(blockdev_superblock, dev);
if (!inode && IS_ENABLED(CONFIG_BLOCK_LEGACY_AUTOLOAD)) {
blk_request_module(dev);
inode = ilookup(blockdev_superblock, dev);
if (inode)
pr_warn_ratelimited(
"block device autoloading is deprecated and will be removed.\n");
}
if (!inode)
return NULL;
/* switch from the inode reference to a device mode one: */
bdev = &BDEV_I(inode)->bdev;
if (!kobject_get_unless_zero(&bdev->bd_device.kobj))
bdev = NULL;
iput(inode);
return bdev;
}
void blkdev_put_no_open(struct block_device *bdev)
{
put_device(&bdev->bd_device);
}
/**
* blkdev_get_by_dev - open a block device by device number
* @dev: device number of block device to open
* @mode: open mode (BLK_OPEN_*)
* @holder: exclusive holder identifier
* @hops: holder operations
*
* Open the block device described by device number @dev. If @holder is not
* %NULL, the block device is opened with exclusive access. Exclusive opens may
* nest for the same @holder.
*
* Use this interface ONLY if you really do not have anything better - i.e. when
* you are behind a truly sucky interface and all you are given is a device
* number. Everything else should use blkdev_get_by_path().
*
* CONTEXT:
* Might sleep.
*
* RETURNS:
* Reference to the block_device on success, ERR_PTR(-errno) on failure.
*/
struct block_device *blkdev_get_by_dev(dev_t dev, blk_mode_t mode, void *holder,
const struct blk_holder_ops *hops)
{
bool unblock_events = true;
struct block_device *bdev;
struct gendisk *disk;
int ret;
ret = devcgroup_check_permission(DEVCG_DEV_BLOCK,
MAJOR(dev), MINOR(dev),
((mode & BLK_OPEN_READ) ? DEVCG_ACC_READ : 0) |
((mode & BLK_OPEN_WRITE) ? DEVCG_ACC_WRITE : 0));
if (ret)
return ERR_PTR(ret);
bdev = blkdev_get_no_open(dev);
if (!bdev)
return ERR_PTR(-ENXIO);
disk = bdev->bd_disk;
if (holder) {
mode |= BLK_OPEN_EXCL;
ret = bd_prepare_to_claim(bdev, holder, hops);
if (ret)
goto put_blkdev;
} else {
if (WARN_ON_ONCE(mode & BLK_OPEN_EXCL)) {
ret = -EIO;
goto put_blkdev;
}
}
disk_block_events(disk);
mutex_lock(&disk->open_mutex);
ret = -ENXIO;
if (!disk_live(disk))
goto abort_claiming;
if (!try_module_get(disk->fops->owner))
goto abort_claiming;
if (bdev_is_partition(bdev))
ret = blkdev_get_part(bdev, mode);
else
ret = blkdev_get_whole(bdev, mode);
if (ret)
goto put_module;
if (holder) {
bd_finish_claiming(bdev, holder, hops);
/*
* Block event polling for write claims if requested. Any write
* holder makes the write_holder state stick until all are
* released. This is good enough and tracking individual
* writeable reference is too fragile given the way @mode is
* used in blkdev_get/put().
*/
if ((mode & BLK_OPEN_WRITE) && !bdev->bd_write_holder &&
(disk->event_flags & DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE)) {
bdev->bd_write_holder = true;
unblock_events = false;
}
}
mutex_unlock(&disk->open_mutex);
if (unblock_events)
disk_unblock_events(disk);
return bdev;
put_module:
module_put(disk->fops->owner);
abort_claiming:
if (holder)
bd_abort_claiming(bdev, holder);
mutex_unlock(&disk->open_mutex);
disk_unblock_events(disk);
put_blkdev:
blkdev_put_no_open(bdev);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(blkdev_get_by_dev);
/**
* blkdev_get_by_path - open a block device by name
* @path: path to the block device to open
* @mode: open mode (BLK_OPEN_*)
* @holder: exclusive holder identifier
* @hops: holder operations
*
* Open the block device described by the device file at @path. If @holder is
* not %NULL, the block device is opened with exclusive access. Exclusive opens
* may nest for the same @holder.
*
* CONTEXT:
* Might sleep.
*
* RETURNS:
* Reference to the block_device on success, ERR_PTR(-errno) on failure.
*/
struct block_device *blkdev_get_by_path(const char *path, blk_mode_t mode,
void *holder, const struct blk_holder_ops *hops)
{
struct block_device *bdev;
dev_t dev;
int error;
error = lookup_bdev(path, &dev);
if (error)
return ERR_PTR(error);
bdev = blkdev_get_by_dev(dev, mode, holder, hops);
if (!IS_ERR(bdev) && (mode & BLK_OPEN_WRITE) && bdev_read_only(bdev)) {
blkdev_put(bdev, holder);
return ERR_PTR(-EACCES);
}
return bdev;
}
EXPORT_SYMBOL(blkdev_get_by_path);
void blkdev_put(struct block_device *bdev, void *holder)
{
struct gendisk *disk = bdev->bd_disk;
/*
* Sync early if it looks like we're the last one. If someone else
* opens the block device between now and the decrement of bd_openers
* then we did a sync that we didn't need to, but that's not the end
* of the world and we want to avoid long (could be several minute)
* syncs while holding the mutex.
*/
if (atomic_read(&bdev->bd_openers) == 1)
sync_blockdev(bdev);
mutex_lock(&disk->open_mutex);
if (holder)
bd_end_claim(bdev, holder);
/*
* Trigger event checking and tell drivers to flush MEDIA_CHANGE
* event. This is to ensure detection of media removal commanded
* from userland - e.g. eject(1).
*/
disk_flush_events(disk, DISK_EVENT_MEDIA_CHANGE);
if (bdev_is_partition(bdev))
blkdev_put_part(bdev);
else
blkdev_put_whole(bdev);
mutex_unlock(&disk->open_mutex);
module_put(disk->fops->owner);
blkdev_put_no_open(bdev);
}
EXPORT_SYMBOL(blkdev_put);
/**
* lookup_bdev() - Look up a struct block_device by name.
* @pathname: Name of the block device in the filesystem.
* @dev: Pointer to the block device's dev_t, if found.
*
* Lookup the block device's dev_t at @pathname in the current
* namespace if possible and return it in @dev.
*
* Context: May sleep.
* Return: 0 if succeeded, negative errno otherwise.
*/
int lookup_bdev(const char *pathname, dev_t *dev)
{
struct inode *inode;
struct path path;
int error;
if (!pathname || !*pathname)
return -EINVAL;
error = kern_path(pathname, LOOKUP_FOLLOW, &path);
if (error)
return error;
inode = d_backing_inode(path.dentry);
error = -ENOTBLK;
if (!S_ISBLK(inode->i_mode))
goto out_path_put;
error = -EACCES;
if (!may_open_dev(&path))
goto out_path_put;
*dev = inode->i_rdev;
error = 0;
out_path_put:
path_put(&path);
return error;
}
EXPORT_SYMBOL(lookup_bdev);
int __invalidate_device(struct block_device *bdev, bool kill_dirty)
{
struct super_block *sb = get_super(bdev);
int res = 0;
if (sb) {
/*
* no need to lock the super, get_super holds the
* read mutex so the filesystem cannot go away
* under us (->put_super runs with the write lock
* hold).
*/
shrink_dcache_sb(sb);
res = invalidate_inodes(sb, kill_dirty);
drop_super(sb);
}
invalidate_bdev(bdev);
return res;
}
EXPORT_SYMBOL(__invalidate_device);
void sync_bdevs(bool wait)
{
struct inode *inode, *old_inode = NULL;
spin_lock(&blockdev_superblock->s_inode_list_lock);
list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) {
struct address_space *mapping = inode->i_mapping;
struct block_device *bdev;
spin_lock(&inode->i_lock);
if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW) ||
mapping->nrpages == 0) {
spin_unlock(&inode->i_lock);
continue;
}
__iget(inode);
spin_unlock(&inode->i_lock);
spin_unlock(&blockdev_superblock->s_inode_list_lock);
/*
* We hold a reference to 'inode' so it couldn't have been
* removed from s_inodes list while we dropped the
* s_inode_list_lock We cannot iput the inode now as we can
* be holding the last reference and we cannot iput it under
* s_inode_list_lock. So we keep the reference and iput it
* later.
*/
iput(old_inode);
old_inode = inode;
bdev = I_BDEV(inode);
mutex_lock(&bdev->bd_disk->open_mutex);
if (!atomic_read(&bdev->bd_openers)) {
; /* skip */
} else if (wait) {
/*
* We keep the error status of individual mapping so
* that applications can catch the writeback error using
* fsync(2). See filemap_fdatawait_keep_errors() for
* details.
*/
filemap_fdatawait_keep_errors(inode->i_mapping);
} else {
filemap_fdatawrite(inode->i_mapping);
}
mutex_unlock(&bdev->bd_disk->open_mutex);
spin_lock(&blockdev_superblock->s_inode_list_lock);
}
spin_unlock(&blockdev_superblock->s_inode_list_lock);
iput(old_inode);
}
/*
* Handle STATX_DIOALIGN for block devices.
*
* Note that the inode passed to this is the inode of a block device node file,
* not the block device's internal inode. Therefore it is *not* valid to use
* I_BDEV() here; the block device has to be looked up by i_rdev instead.
*/
void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
{
struct block_device *bdev;
bdev = blkdev_get_no_open(inode->i_rdev);
if (!bdev)
return;
stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;
stat->dio_offset_align = bdev_logical_block_size(bdev);
stat->result_mask |= STATX_DIOALIGN;
blkdev_put_no_open(bdev);
}