diff options
Diffstat (limited to 'fs/block_dev.c')
| -rw-r--r-- | fs/block_dev.c | 37 |
1 files changed, 22 insertions, 15 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index c7e4163ede87..33b813e04f79 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -14,6 +14,7 @@ #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> @@ -42,7 +43,7 @@ static inline struct bdev_inode *BDEV_I(struct inode *inode) return container_of(inode, struct bdev_inode, vfs_inode); } -inline struct block_device *I_BDEV(struct inode *inode) +struct block_device *I_BDEV(struct inode *inode) { return &BDEV_I(inode)->bdev; } @@ -151,6 +152,9 @@ blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) struct file *file = iocb->ki_filp; struct inode *inode = file->f_mapping->host; + if (IS_DAX(inode)) + return dax_do_io(iocb, inode, iter, offset, blkdev_get_block, + NULL, DIO_SKIP_DIO_COUNT); return __blockdev_direct_IO(iocb, inode, I_BDEV(inode), iter, offset, blkdev_get_block, NULL, NULL, DIO_SKIP_DIO_COUNT); @@ -376,7 +380,7 @@ int bdev_read_page(struct block_device *bdev, sector_t sector, struct page *page) { const struct block_device_operations *ops = bdev->bd_disk->fops; - if (!ops->rw_page) + if (!ops->rw_page || bdev_get_integrity(bdev)) return -EOPNOTSUPP; return ops->rw_page(bdev, sector + get_start_sect(bdev), page, READ); } @@ -407,7 +411,7 @@ int bdev_write_page(struct block_device *bdev, sector_t sector, int result; int rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE; const struct block_device_operations *ops = bdev->bd_disk->fops; - if (!ops->rw_page) + if (!ops->rw_page || bdev_get_integrity(bdev)) return -EOPNOTSUPP; set_page_writeback(page); result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, rw); @@ -442,6 +446,12 @@ long bdev_direct_access(struct block_device *bdev, sector_t sector, long avail; const struct block_device_operations *ops = bdev->bd_disk->fops; + /* + * The device driver is allowed to sleep, in order to make the + * memory directly accessible. + */ + might_sleep(); + if (size < 0) return size; if (!ops->direct_access) @@ -546,7 +556,8 @@ static struct file_system_type bd_type = { .kill_sb = kill_anon_super, }; -static struct super_block *blockdev_superblock __read_mostly; +struct super_block *blockdev_superblock __read_mostly; +EXPORT_SYMBOL_GPL(blockdev_superblock); void __init bdev_cache_init(void) { @@ -687,11 +698,6 @@ static struct block_device *bd_acquire(struct inode *inode) return bdev; } -int sb_is_blkdev_sb(struct super_block *sb) -{ - return sb == blockdev_superblock; -} - /* Call when you free inode */ void bd_forget(struct inode *inode) @@ -1173,6 +1179,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) bdev->bd_disk = disk; bdev->bd_queue = disk->queue; bdev->bd_contains = bdev; + bdev->bd_inode->i_flags = disk->fops->direct_access ? S_DAX : 0; if (!partno) { ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); @@ -1762,7 +1769,7 @@ void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) { struct inode *inode, *old_inode = NULL; - spin_lock(&inode_sb_list_lock); + 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; @@ -1774,13 +1781,13 @@ void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) } __iget(inode); spin_unlock(&inode->i_lock); - spin_unlock(&inode_sb_list_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 - * inode_sb_list_lock. We cannot iput the inode now as we can + * s_inode_list_lock We cannot iput the inode now as we can * be holding the last reference and we cannot iput it under - * inode_sb_list_lock. So we keep the reference and iput it + * s_inode_list_lock. So we keep the reference and iput it * later. */ iput(old_inode); @@ -1788,8 +1795,8 @@ void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) func(I_BDEV(inode), arg); - spin_lock(&inode_sb_list_lock); + spin_lock(&blockdev_superblock->s_inode_list_lock); } - spin_unlock(&inode_sb_list_lock); + spin_unlock(&blockdev_superblock->s_inode_list_lock); iput(old_inode); } |