From: Darrick J. Wong <djwong@xxxxxxxxxx>
Add to our stubbed-out in-memory btrees the ability to connect them with
an actual in-memory backing file (aka xfiles) and the necessary pieces
to track free space in the xfile and flush dirty xfbtree buffers on
demand, which we'll need for online repair.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
fs/xfs/scrub/trace.h | 1 +
fs/xfs/scrub/xfile.c | 11 +++++++++++
fs/xfs/scrub/xfile.h | 2 ++
3 files changed, 14 insertions(+)
diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h
index 979ee2789668..4a6f0f1b0881 100644
--- a/fs/xfs/scrub/trace.h
+++ b/fs/xfs/scrub/trace.h
@@ -755,6 +755,7 @@ DEFINE_EVENT(xfile_class, name, \
DEFINE_XFILE_EVENT(xfile_pread);
DEFINE_XFILE_EVENT(xfile_pwrite);
DEFINE_XFILE_EVENT(xfile_seek_data);
+DEFINE_XFILE_EVENT(xfile_discard);
TRACE_EVENT(xfarray_create,
TP_PROTO(struct xfarray *xfa, unsigned long long required_capacity),
diff --git a/fs/xfs/scrub/xfile.c b/fs/xfs/scrub/xfile.c
index 43455aa78243..f9888b6dd728 100644
--- a/fs/xfs/scrub/xfile.c
+++ b/fs/xfs/scrub/xfile.c
@@ -285,6 +285,17 @@ xfile_pwrite(
return error;
}
+/* Discard pages backing a range of the xfile. */
+void
+xfile_discard(
+ struct xfile *xf,
+ loff_t pos,
+ u64 count)
+{
+ trace_xfile_discard(xf, pos, count);
+ shmem_truncate_range(file_inode(xf->file), pos, pos + count - 1);
+}
+
/* Find the next written area in the xfile data for a given offset. */
loff_t
xfile_seek_data(
diff --git a/fs/xfs/scrub/xfile.h b/fs/xfs/scrub/xfile.h
index b37dba1961d8..973c8fc37707 100644
--- a/fs/xfs/scrub/xfile.h
+++ b/fs/xfs/scrub/xfile.h
@@ -46,6 +46,8 @@ xfile_obj_store(struct xfile *xf, const void *buf, size_t count, loff_t pos)
return 0;
}
+void xfile_discard(struct xfile *xf, loff_t pos, u64 count);
+int xfile_prealloc(struct xfile *xf, loff_t pos, u64 count);
loff_t xfile_seek_data(struct xfile *xf, loff_t pos);
struct xfile_stat {
