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xfs: add dax dedupe support

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Introduce xfs_mmaplock_two_inodes_and_break_dax_layout() for dax files who
are going to be deduped.  After that, call compare range function only
when files are both DAX or not.

Link: https://lkml.kernel.org/r/20220603053738.1218681-15-ruansy.fnst@fujitsu.com
Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dan Williams <dan.j.wiliams@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Ritesh Harjani <riteshh@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Shiyang Ruan 2022-06-03 13:37:38 +08:00 committed by akpm
parent ea6c49b784
commit 13f9e267fd
4 changed files with 69 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/xfs/xfs_file.c
View File

@ -808,7 +808,7 @@ xfs_wait_dax_page(
xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
}
static int
int
xfs_break_dax_layouts(
struct inode *inode,
bool *retry)

69
fs/xfs/xfs_inode.c
View File

@ -3767,6 +3767,50 @@ retry:
return 0;
}
static int
xfs_mmaplock_two_inodes_and_break_dax_layout(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
int error;
bool retry;
struct page *page;
if (ip1->i_ino > ip2->i_ino)
swap(ip1, ip2);
again:
retry = false;
/* Lock the first inode */
xfs_ilock(ip1, XFS_MMAPLOCK_EXCL);
error = xfs_break_dax_layouts(VFS_I(ip1), &retry);
if (error || retry) {
xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
if (error == 0 && retry)
goto again;
return error;
}
if (ip1 == ip2)
return 0;
/* Nested lock the second inode */
xfs_ilock(ip2, xfs_lock_inumorder(XFS_MMAPLOCK_EXCL, 1));
/*
* We cannot use xfs_break_dax_layouts() directly here because it may
* need to unlock & lock the XFS_MMAPLOCK_EXCL which is not suitable
* for this nested lock case.
*/
page = dax_layout_busy_page(VFS_I(ip2)->i_mapping);
if (page && page_ref_count(page) != 1) {
xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
goto again;
}
return 0;
}
/*
* Lock two inodes so that userspace cannot initiate I/O via file syscalls or
* mmap activity.
@ -3781,8 +3825,19 @@ xfs_ilock2_io_mmap(
ret = xfs_iolock_two_inodes_and_break_layout(VFS_I(ip1), VFS_I(ip2));
if (ret)
return ret;
filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping,
VFS_I(ip2)->i_mapping);
if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) {
ret = xfs_mmaplock_two_inodes_and_break_dax_layout(ip1, ip2);
if (ret) {
inode_unlock(VFS_I(ip2));
if (ip1 != ip2)
inode_unlock(VFS_I(ip1));
return ret;
}
} else
filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping,
VFS_I(ip2)->i_mapping);
return 0;
}
@ -3792,8 +3847,14 @@ xfs_iunlock2_io_mmap(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping,
VFS_I(ip2)->i_mapping);
if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) {
xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
if (ip1 != ip2)
xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
} else
filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping,
VFS_I(ip2)->i_mapping);
inode_unlock(VFS_I(ip2));
if (ip1 != ip2)
inode_unlock(VFS_I(ip1));

1
fs/xfs/xfs_inode.h
View File

@ -467,6 +467,7 @@ xfs_itruncate_extents(
}
/* from xfs_file.c */
int xfs_break_dax_layouts(struct inode *inode, bool *retry);
int xfs_break_layouts(struct inode *inode, uint *iolock,
enum layout_break_reason reason);

4
fs/xfs/xfs_reflink.c
View File

@ -1363,8 +1363,8 @@ xfs_reflink_remap_prep(
if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest))
goto out_unlock;
/* Don't share DAX file data for now. */
if (IS_DAX(inode_in) || IS_DAX(inode_out))
/* Don't share DAX file data with non-DAX file. */
if (IS_DAX(inode_in) != IS_DAX(inode_out))
goto out_unlock;
if (!IS_DAX(inode_in))