dax: give DAX clearing code correct bdev

dax_clear_blocks() needs a valid struct block_device and previously it
was using inode->i_sb->s_bdev in all cases.  This is correct for normal
inodes on mounted ext2, ext4 and XFS filesystems, but is incorrect for
DAX raw block devices and for XFS real-time devices.

Instead, rename dax_clear_blocks() to dax_clear_sectors(), and change
its arguments to take a bdev and a sector instead of an inode and a
block.  This better reflects what the function does, and it allows the
filesystem and raw block device code to pass in an appropriate struct
block_device.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Al Viro <viro@ftp.linux.org.uk>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ross Zwisler 2016-02-26 15:19:52 -08:00 committed by Linus Torvalds
parent 73f34a5e2c
commit 20a90f5899
6 changed files with 13 additions and 10 deletions

View File

@ -79,15 +79,14 @@ struct page *read_dax_sector(struct block_device *bdev, sector_t n)
}
/*
* dax_clear_blocks() is called from within transaction context from XFS,
* dax_clear_sectors() is called from within transaction context from XFS,
* and hence this means the stack from this point must follow GFP_NOFS
* semantics for all operations.
*/
int dax_clear_blocks(struct inode *inode, sector_t block, long _size)
int dax_clear_sectors(struct block_device *bdev, sector_t _sector, long _size)
{
struct block_device *bdev = inode->i_sb->s_bdev;
struct blk_dax_ctl dax = {
.sector = block << (inode->i_blkbits - 9),
.sector = _sector,
.size = _size,
};
@ -109,7 +108,7 @@ int dax_clear_blocks(struct inode *inode, sector_t block, long _size)
wmb_pmem();
return 0;
}
EXPORT_SYMBOL_GPL(dax_clear_blocks);
EXPORT_SYMBOL_GPL(dax_clear_sectors);
/* the clear_pmem() calls are ordered by a wmb_pmem() in the caller */
static void dax_new_buf(void __pmem *addr, unsigned size, unsigned first,

View File

@ -737,8 +737,10 @@ static int ext2_get_blocks(struct inode *inode,
* so that it's not found by another thread before it's
* initialised
*/
err = dax_clear_blocks(inode, le32_to_cpu(chain[depth-1].key),
1 << inode->i_blkbits);
err = dax_clear_sectors(inode->i_sb->s_bdev,
le32_to_cpu(chain[depth-1].key) <<
(inode->i_blkbits - 9),
1 << inode->i_blkbits);
if (err) {
mutex_unlock(&ei->truncate_mutex);
goto cleanup;

View File

@ -55,7 +55,7 @@ xfs_count_page_state(
} while ((bh = bh->b_this_page) != head);
}
STATIC struct block_device *
struct block_device *
xfs_find_bdev_for_inode(
struct inode *inode)
{

View File

@ -62,5 +62,6 @@ int xfs_get_blocks_dax_fault(struct inode *inode, sector_t offset,
struct buffer_head *map_bh, int create);
extern void xfs_count_page_state(struct page *, int *, int *);
extern struct block_device *xfs_find_bdev_for_inode(struct inode *);
#endif /* __XFS_AOPS_H__ */

View File

@ -75,7 +75,8 @@ xfs_zero_extent(
ssize_t size = XFS_FSB_TO_B(mp, count_fsb);
if (IS_DAX(VFS_I(ip)))
return dax_clear_blocks(VFS_I(ip), block, size);
return dax_clear_sectors(xfs_find_bdev_for_inode(VFS_I(ip)),
sector, size);
/*
* let the block layer decide on the fastest method of

View File

@ -7,7 +7,7 @@
ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, loff_t,
get_block_t, dio_iodone_t, int flags);
int dax_clear_blocks(struct inode *, sector_t block, long size);
int dax_clear_sectors(struct block_device *bdev, sector_t _sector, long _size);
int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
int dax_truncate_page(struct inode *, loff_t from, get_block_t);
int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t,