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xfs: use iomap to implement DAX 

Another users of buffer_heads bytes the dust.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2016-09-19 11:28:38 +10:00 committed by Dave Chinner
parent e372843a40
commit 6c31f495d1
2 changed files with 24 additions and 48 deletions
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61
fs/xfs/xfs_file.c
View File

@ -332,10 +332,7 @@ xfs_file_dax_read(
struct kiocb *iocb,
struct iov_iter *to)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = mapping->host;
struct xfs_inode *ip = XFS_I(inode);
struct iov_iter data = *to;
struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host);
size_t count = iov_iter_count(to);
ssize_t ret = 0;
@ -345,11 +342,7 @@ xfs_file_dax_read(
return 0; /* skip atime */
xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct, NULL, 0);
if (ret > 0) {
iocb->ki_pos += ret;
iov_iter_advance(to, ret);
}
ret = iomap_dax_rw(iocb, to, &xfs_iomap_ops);
xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
file_accessed(iocb->ki_filp);
@ -711,52 +704,32 @@ xfs_file_dax_write(
struct kiocb *iocb,
struct iov_iter *from)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = mapping->host;
struct inode *inode = iocb->ki_filp->f_mapping->host;
struct xfs_inode *ip = XFS_I(inode);
ssize_t ret = 0;
int iolock = XFS_IOLOCK_EXCL;
struct iov_iter data;
ssize_t ret, error = 0;
size_t count;
loff_t pos;
xfs_rw_ilock(ip, iolock);
ret = xfs_file_aio_write_checks(iocb, from, &iolock);
if (ret)
goto out;
/*
* Yes, even DAX files can have page cache attached to them: A zeroed
* page is inserted into the pagecache when we have to serve a write
* fault on a hole. It should never be dirtied and can simply be
* dropped from the pagecache once we get real data for the page.
*
* XXX: This is racy against mmap, and there's nothing we can do about
* it. dax_do_io() should really do this invalidation internally as
* it will know if we've allocated over a holei for this specific IO and
* if so it needs to update the mapping tree and invalidate existing
* PTEs over the newly allocated range. Remove this invalidation when
* dax_do_io() is fixed up.
*/
if (mapping->nrpages) {
loff_t end = iocb->ki_pos + iov_iter_count(from) - 1;
pos = iocb->ki_pos;
count = iov_iter_count(from);
ret = invalidate_inode_pages2_range(mapping,
iocb->ki_pos >> PAGE_SHIFT,
end >> PAGE_SHIFT);
WARN_ON_ONCE(ret);
trace_xfs_file_dax_write(ip, count, pos);
ret = iomap_dax_rw(iocb, from, &xfs_iomap_ops);
if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
i_size_write(inode, iocb->ki_pos);
error = xfs_setfilesize(ip, pos, ret);
}
trace_xfs_file_dax_write(ip, iov_iter_count(from), iocb->ki_pos);
data = *from;
ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct,
xfs_end_io_direct_write, 0);
if (ret > 0) {
iocb->ki_pos += ret;
iov_iter_advance(from, ret);
}
out:
xfs_rw_iunlock(ip, iolock);
return ret;
return error ? error : ret;
}
STATIC ssize_t
@ -1495,7 +1468,7 @@ xfs_filemap_page_mkwrite(
xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
if (IS_DAX(inode)) {
ret = dax_mkwrite(vma, vmf, xfs_get_blocks_dax_fault);
ret = iomap_dax_fault(vma, vmf, &xfs_iomap_ops);
} else {
ret = iomap_page_mkwrite(vma, vmf, &xfs_iomap_ops);
ret = block_page_mkwrite_return(ret);
@ -1529,7 +1502,7 @@ xfs_filemap_fault(
* changes to xfs_get_blocks_direct() to map unwritten extent
* ioend for conversion on read-only mappings.
*/
ret = dax_fault(vma, vmf, xfs_get_blocks_dax_fault);
ret = iomap_dax_fault(vma, vmf, &xfs_iomap_ops);
} else
ret = filemap_fault(vma, vmf);
xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);

11
fs/xfs/xfs_iomap.c
View File

@ -934,11 +934,13 @@ error_on_bmapi_transaction:
return error;
}
static inline bool imap_needs_alloc(struct xfs_bmbt_irec *imap, int nimaps)
static inline bool imap_needs_alloc(struct inode *inode,
struct xfs_bmbt_irec *imap, int nimaps)
{
return !nimaps ||
imap->br_startblock == HOLESTARTBLOCK ||
imap->br_startblock == DELAYSTARTBLOCK;
imap->br_startblock == DELAYSTARTBLOCK ||
(IS_DAX(inode) && ISUNWRITTEN(imap));
}
static int
@ -959,7 +961,8 @@ xfs_file_iomap_begin(
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
if ((flags & IOMAP_WRITE) && !xfs_get_extsz_hint(ip)) {
if ((flags & IOMAP_WRITE) &&
!IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
return xfs_file_iomap_begin_delay(inode, offset, length, flags,
iomap);
}
@ -979,7 +982,7 @@ xfs_file_iomap_begin(
return error;
}
if ((flags & IOMAP_WRITE) && imap_needs_alloc(&imap, nimaps)) {
if ((flags & IOMAP_WRITE) && imap_needs_alloc(inode, &imap, nimaps)) {
/*
* We cap the maximum length we map here to MAX_WRITEBACK_PAGES
* pages to keep the chunks of work done where somewhat symmetric