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Merge branch 'iomap-4.9-dax' into for-next

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This commit is contained in:
Dave Chinner
2016-10-03 09:53:59 +11:00
parent a89b3f97bb d5bfccdf38
commit a1f45e668e
13 changed files with 466 additions and 124 deletions
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81
fs/xfs/xfs_file.c
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@@ -333,10 +333,7 @@ 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;
@@ -346,11 +343,7 @@ 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);
@@ -712,70 +705,32 @@ 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);
struct xfs_mount *mp = ip->i_mount;
ssize_t ret = 0;
int unaligned_io = 0;
int iolock;
struct iov_iter data;
int iolock = XFS_IOLOCK_EXCL;
ssize_t ret, error = 0;
size_t count;
loff_t pos;
/* "unaligned" here means not aligned to a filesystem block */
if ((iocb->ki_pos & mp->m_blockmask) ||
((iocb->ki_pos + iov_iter_count(from)) & mp->m_blockmask)) {
unaligned_io = 1;
iolock = XFS_IOLOCK_EXCL;
} else if (mapping->nrpages) {
iolock = XFS_IOLOCK_EXCL;
} else {
iolock = XFS_IOLOCK_SHARED;
}
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);
}
if (iolock == XFS_IOLOCK_EXCL && !unaligned_io) {
xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
iolock = XFS_IOLOCK_SHARED;
}
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
@@ -1514,7 +1469,7 @@ 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);
@@ -1548,7 +1503,7 @@ 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);