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-rw-r--r--block/bdev.c99
1 files changed, 66 insertions, 33 deletions
diff --git a/block/bdev.c b/block/bdev.c
index da2a167a4d..353677ac49 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -43,6 +43,11 @@ static inline struct bdev_inode *BDEV_I(struct inode *inode)
return container_of(inode, struct bdev_inode, vfs_inode);
}
+static inline struct inode *BD_INODE(struct block_device *bdev)
+{
+ return &container_of(bdev, struct bdev_inode, bdev)->vfs_inode;
+}
+
struct block_device *I_BDEV(struct inode *inode)
{
return &BDEV_I(inode)->bdev;
@@ -57,7 +62,7 @@ EXPORT_SYMBOL(file_bdev);
static void bdev_write_inode(struct block_device *bdev)
{
- struct inode *inode = bdev->bd_inode;
+ struct inode *inode = BD_INODE(bdev);
int ret;
spin_lock(&inode->i_lock);
@@ -76,7 +81,7 @@ static void bdev_write_inode(struct block_device *bdev)
/* 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;
+ struct address_space *mapping = bdev->bd_mapping;
if (mapping_empty(mapping))
return;
@@ -88,7 +93,7 @@ static void kill_bdev(struct block_device *bdev)
/* Invalidate clean unused buffers and pagecache. */
void invalidate_bdev(struct block_device *bdev)
{
- struct address_space *mapping = bdev->bd_inode->i_mapping;
+ struct address_space *mapping = bdev->bd_mapping;
if (mapping->nrpages) {
invalidate_bh_lrus();
@@ -116,7 +121,7 @@ int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode,
goto invalidate;
}
- truncate_inode_pages_range(bdev->bd_inode->i_mapping, lstart, lend);
+ truncate_inode_pages_range(bdev->bd_mapping, lstart, lend);
if (!(mode & BLK_OPEN_EXCL))
bd_abort_claiming(bdev, truncate_bdev_range);
return 0;
@@ -126,7 +131,7 @@ 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,
+ return invalidate_inode_pages2_range(bdev->bd_mapping,
lstart >> PAGE_SHIFT,
lend >> PAGE_SHIFT);
}
@@ -134,18 +139,21 @@ invalidate:
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);
+ loff_t size = i_size_read(BD_INODE(bdev));
while (bsize < PAGE_SIZE) {
if (size & bsize)
break;
bsize <<= 1;
}
- bdev->bd_inode->i_blkbits = blksize_bits(bsize);
+ BD_INODE(bdev)->i_blkbits = blksize_bits(bsize);
}
-int set_blocksize(struct block_device *bdev, int size)
+int set_blocksize(struct file *file, int size)
{
+ struct inode *inode = file->f_mapping->host;
+ struct block_device *bdev = I_BDEV(inode);
+
/* 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;
@@ -154,10 +162,13 @@ int set_blocksize(struct block_device *bdev, int size)
if (size < bdev_logical_block_size(bdev))
return -EINVAL;
+ if (!file->private_data)
+ return -EINVAL;
+
/* Don't change the size if it is same as current */
- if (bdev->bd_inode->i_blkbits != blksize_bits(size)) {
+ if (inode->i_blkbits != blksize_bits(size)) {
sync_blockdev(bdev);
- bdev->bd_inode->i_blkbits = blksize_bits(size);
+ inode->i_blkbits = blksize_bits(size);
kill_bdev(bdev);
}
return 0;
@@ -167,7 +178,7 @@ EXPORT_SYMBOL(set_blocksize);
int sb_set_blocksize(struct super_block *sb, int size)
{
- if (set_blocksize(sb->s_bdev, size))
+ if (set_blocksize(sb->s_bdev_file, size))
return 0;
/* If we get here, we know size is power of two
* and it's value is between 512 and PAGE_SIZE */
@@ -192,7 +203,7 @@ int sync_blockdev_nowait(struct block_device *bdev)
{
if (!bdev)
return 0;
- return filemap_flush(bdev->bd_inode->i_mapping);
+ return filemap_flush(bdev->bd_mapping);
}
EXPORT_SYMBOL_GPL(sync_blockdev_nowait);
@@ -204,13 +215,13 @@ int sync_blockdev(struct block_device *bdev)
{
if (!bdev)
return 0;
- return filemap_write_and_wait(bdev->bd_inode->i_mapping);
+ return filemap_write_and_wait(bdev->bd_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,
+ return filemap_write_and_wait_range(bdev->bd_mapping,
lstart, lend);
}
EXPORT_SYMBOL(sync_blockdev_range);
@@ -411,13 +422,11 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
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;
+ atomic_set(&bdev->__bd_flags, partno);
+ bdev->bd_mapping = &inode->i_data;
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;
+ if (partno && bdev_test_flag(disk->part0, BD_HAS_SUBMIT_BIO))
+ bdev_set_flag(bdev, BD_HAS_SUBMIT_BIO);
bdev->bd_stats = alloc_percpu(struct disk_stats);
if (!bdev->bd_stats) {
iput(inode);
@@ -430,19 +439,30 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
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);
+ i_size_write(BD_INODE(bdev), (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)
{
+ struct inode *inode = BD_INODE(bdev);
if (bdev_stable_writes(bdev))
- mapping_set_stable_writes(bdev->bd_inode->i_mapping);
+ mapping_set_stable_writes(bdev->bd_mapping);
bdev->bd_dev = dev;
- bdev->bd_inode->i_rdev = dev;
- bdev->bd_inode->i_ino = dev;
- insert_inode_hash(bdev->bd_inode);
+ inode->i_rdev = dev;
+ inode->i_ino = dev;
+ insert_inode_hash(inode);
+}
+
+void bdev_unhash(struct block_device *bdev)
+{
+ remove_inode_hash(BD_INODE(bdev));
+}
+
+void bdev_drop(struct block_device *bdev)
+{
+ iput(BD_INODE(bdev));
}
long nr_blockdev_pages(void)
@@ -620,7 +640,7 @@ static void bd_end_claim(struct block_device *bdev, void *holder)
bdev->bd_holder = NULL;
bdev->bd_holder_ops = NULL;
mutex_unlock(&bdev->bd_holder_lock);
- if (bdev->bd_write_holder)
+ if (bdev_test_flag(bdev, BD_WRITE_HOLDER))
unblock = true;
}
if (!whole->bd_holders)
@@ -633,7 +653,7 @@ static void bd_end_claim(struct block_device *bdev, void *holder)
*/
if (unblock) {
disk_unblock_events(bdev->bd_disk);
- bdev->bd_write_holder = false;
+ bdev_clear_flag(bdev, BD_WRITE_HOLDER);
}
}
@@ -900,9 +920,10 @@ int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder,
* writeable reference is too fragile given the way @mode is
* used in blkdev_get/put().
*/
- if ((mode & BLK_OPEN_WRITE) && !bdev->bd_write_holder &&
+ if ((mode & BLK_OPEN_WRITE) &&
+ !bdev_test_flag(bdev, BD_WRITE_HOLDER) &&
(disk->event_flags & DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE)) {
- bdev->bd_write_holder = true;
+ bdev_set_flag(bdev, BD_WRITE_HOLDER);
unblock_events = false;
}
}
@@ -912,12 +933,12 @@ int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder,
disk_unblock_events(disk);
bdev_file->f_flags |= O_LARGEFILE;
- bdev_file->f_mode |= FMODE_BUF_RASYNC | FMODE_CAN_ODIRECT;
+ bdev_file->f_mode |= FMODE_CAN_ODIRECT;
if (bdev_nowait(bdev))
bdev_file->f_mode |= FMODE_NOWAIT;
if (mode & BLK_OPEN_RESTRICT_WRITES)
bdev_file->f_mode |= FMODE_WRITE_RESTRICTED;
- bdev_file->f_mapping = bdev->bd_inode->i_mapping;
+ bdev_file->f_mapping = bdev->bd_mapping;
bdev_file->f_wb_err = filemap_sample_wb_err(bdev_file->f_mapping);
bdev_file->private_data = holder;
@@ -979,13 +1000,13 @@ struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
return ERR_PTR(-ENXIO);
flags = blk_to_file_flags(mode);
- bdev_file = alloc_file_pseudo_noaccount(bdev->bd_inode,
+ bdev_file = alloc_file_pseudo_noaccount(BD_INODE(bdev),
blockdev_mnt, "", flags | O_LARGEFILE, &def_blk_fops);
if (IS_ERR(bdev_file)) {
blkdev_put_no_open(bdev);
return bdev_file;
}
- ihold(bdev->bd_inode);
+ ihold(BD_INODE(bdev));
ret = bdev_open(bdev, mode, holder, hops, bdev_file);
if (ret) {
@@ -1260,6 +1281,18 @@ void bdev_statx_dioalign(struct inode *inode, struct kstat *stat)
blkdev_put_no_open(bdev);
}
+bool disk_live(struct gendisk *disk)
+{
+ return !inode_unhashed(BD_INODE(disk->part0));
+}
+EXPORT_SYMBOL_GPL(disk_live);
+
+unsigned int block_size(struct block_device *bdev)
+{
+ return 1 << BD_INODE(bdev)->i_blkbits;
+}
+EXPORT_SYMBOL_GPL(block_size);
+
static int __init setup_bdev_allow_write_mounted(char *str)
{
if (kstrtobool(str, &bdev_allow_write_mounted))