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Subject[PATCH v10 7/8] xfs: support CoW in fsdax mode
Date
In fsdax mode, WRITE and ZERO on a shared extent need CoW performed.
After that, new allocated extents needs to be remapped to the file.
So, add a CoW identification in ->iomap_begin(), and implement
->iomap_end() to do the remapping work.

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
---
fs/xfs/xfs_bmap_util.c | 3 +--
fs/xfs/xfs_file.c | 7 ++-----
fs/xfs/xfs_iomap.c | 30 +++++++++++++++++++++++++++-
fs/xfs/xfs_iomap.h | 44 ++++++++++++++++++++++++++++++++++++++++++
fs/xfs/xfs_iops.c | 7 +++----
fs/xfs/xfs_reflink.c | 3 +--
6 files changed, 80 insertions(+), 14 deletions(-)

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 73a36b7be3bd..0681250e0a5d 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1009,8 +1009,7 @@ xfs_free_file_space(
return 0;
if (offset + len > XFS_ISIZE(ip))
len = XFS_ISIZE(ip) - offset;
- error = iomap_zero_range(VFS_I(ip), offset, len, NULL,
- &xfs_buffered_write_iomap_ops);
+ error = xfs_iomap_zero_range(ip, offset, len, NULL);
if (error)
return error;

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 7aa943edfc02..afde4fbefb6f 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -704,7 +704,7 @@ xfs_file_dax_write(
pos = iocb->ki_pos;

trace_xfs_file_dax_write(iocb, from);
- ret = dax_iomap_rw(iocb, from, &xfs_direct_write_iomap_ops);
+ ret = dax_iomap_rw(iocb, from, &xfs_dax_write_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);
@@ -1327,10 +1327,7 @@ __xfs_filemap_fault(
pfn_t pfn;

xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
- ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL,
- (write_fault && !vmf->cow_page) ?
- &xfs_direct_write_iomap_ops :
- &xfs_read_iomap_ops);
+ ret = xfs_dax_iomap_fault(vmf, pe_size, write_fault, &pfn);
if (ret & VM_FAULT_NEEDDSYNC)
ret = dax_finish_sync_fault(vmf, pe_size, pfn);
xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 093758440ad5..51cb5b713521 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -761,7 +761,8 @@ xfs_direct_write_iomap_begin(

/* may drop and re-acquire the ilock */
error = xfs_reflink_allocate_cow(ip, &imap, &cmap, &shared,
- &lockmode, flags & IOMAP_DIRECT);
+ &lockmode,
+ (flags & IOMAP_DIRECT) || IS_DAX(inode));
if (error)
goto out_unlock;
if (shared)
@@ -854,6 +855,33 @@ const struct iomap_ops xfs_direct_write_iomap_ops = {
.iomap_begin = xfs_direct_write_iomap_begin,
};

+static int
+xfs_dax_write_iomap_end(
+ struct inode *inode,
+ loff_t pos,
+ loff_t length,
+ ssize_t written,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+
+ if (!xfs_is_cow_inode(ip))
+ return 0;
+
+ if (!written) {
+ xfs_reflink_cancel_cow_range(ip, pos, length, true);
+ return 0;
+ }
+
+ return xfs_reflink_end_cow(ip, pos, written);
+}
+
+const struct iomap_ops xfs_dax_write_iomap_ops = {
+ .iomap_begin = xfs_direct_write_iomap_begin,
+ .iomap_end = xfs_dax_write_iomap_end,
+};
+
static int
xfs_buffered_write_iomap_begin(
struct inode *inode,
diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
index 7d3703556d0e..81726bfbf890 100644
--- a/fs/xfs/xfs_iomap.h
+++ b/fs/xfs/xfs_iomap.h
@@ -7,6 +7,7 @@
#define __XFS_IOMAP_H__

#include <linux/iomap.h>
+#include <linux/dax.h>

struct xfs_inode;
struct xfs_bmbt_irec;
@@ -45,5 +46,48 @@ extern const struct iomap_ops xfs_direct_write_iomap_ops;
extern const struct iomap_ops xfs_read_iomap_ops;
extern const struct iomap_ops xfs_seek_iomap_ops;
extern const struct iomap_ops xfs_xattr_iomap_ops;
+extern const struct iomap_ops xfs_dax_write_iomap_ops;
+
+static inline int
+xfs_iomap_zero_range(
+ struct xfs_inode *ip,
+ loff_t pos,
+ loff_t len,
+ bool *did_zero)
+{
+ struct inode *inode = VFS_I(ip);
+
+ return iomap_zero_range(inode, pos, len, did_zero,
+ IS_DAX(inode) ?
+ &xfs_dax_write_iomap_ops :
+ &xfs_buffered_write_iomap_ops);
+}
+
+static inline int
+xfs_iomap_truncate_page(
+ struct xfs_inode *ip,
+ loff_t pos,
+ bool *did_zero)
+{
+ struct inode *inode = VFS_I(ip);
+
+ return iomap_truncate_page(inode, pos, did_zero,
+ IS_DAX(inode) ?
+ &xfs_dax_write_iomap_ops :
+ &xfs_buffered_write_iomap_ops);
+}
+
+static inline int
+xfs_dax_iomap_fault(
+ struct vm_fault *vmf,
+ enum page_entry_size pe_size,
+ bool write_fault,
+ pfn_t *pfn)
+{
+ return dax_iomap_fault(vmf, pe_size, pfn, NULL,
+ (write_fault && !vmf->cow_page) ?
+ &xfs_dax_write_iomap_ops :
+ &xfs_read_iomap_ops);
+}

#endif /* __XFS_IOMAP_H__*/
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index a607d6aca5c4..332e6208dffd 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -911,8 +911,8 @@ xfs_setattr_size(
*/
if (newsize > oldsize) {
trace_xfs_zero_eof(ip, oldsize, newsize - oldsize);
- error = iomap_zero_range(inode, oldsize, newsize - oldsize,
- &did_zeroing, &xfs_buffered_write_iomap_ops);
+ error = xfs_iomap_zero_range(ip, oldsize, newsize - oldsize,
+ &did_zeroing);
} else {
/*
* iomap won't detect a dirty page over an unwritten block (or a
@@ -924,8 +924,7 @@ xfs_setattr_size(
newsize);
if (error)
return error;
- error = iomap_truncate_page(inode, newsize, &did_zeroing,
- &xfs_buffered_write_iomap_ops);
+ error = xfs_iomap_truncate_page(ip, newsize, &did_zeroing);
}

if (error)
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 7ecea0311e88..9d876e268734 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1269,8 +1269,7 @@ xfs_reflink_zero_posteof(
return 0;

trace_xfs_zero_eof(ip, isize, pos - isize);
- return iomap_zero_range(VFS_I(ip), isize, pos - isize, NULL,
- &xfs_buffered_write_iomap_ops);
+ return xfs_iomap_zero_range(ip, isize, pos - isize, NULL);
}

/*
--
2.33.0


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