[PATCH v1 4/7] xfs: Add b_rw_hint to xfs_buf
From: Allison Henderson <hidden>
Date: 2018-11-28 14:52:43
Also in:
linux-fsdevel, linux-xfs, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest, xfs filesystem · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds, Carlos Maiolino
This patch adds a new field b_rw_hint to xfs_buf. We will need this to properly initialize the new bio->bi_rw_hint when submitting the read request. When the read completes, we then store the returned mirror in the b_rw_hint. Signed-off-by: Allison Henderson <redacted> --- fs/xfs/xfs_buf.c | 5 ++++- fs/xfs/xfs_buf.h | 7 +++++++ 2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index b21ea2b..dd8ba59 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c@@ -1322,8 +1322,10 @@ xfs_buf_bio_end_io( if (!bp->b_error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ)) invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp)); - if (atomic_dec_and_test(&bp->b_io_remaining) == 1) + if (atomic_dec_and_test(&bp->b_io_remaining) == 1) { + bp->b_rw_hint = bio->bi_rw_hint; xfs_buf_ioend_async(bp); + } bio_put(bio); }
@@ -1369,6 +1371,7 @@ xfs_buf_ioapply_map( bio->bi_iter.bi_sector = sector; bio->bi_end_io = xfs_buf_bio_end_io; bio->bi_private = bp; + bio->bi_rw_hint = bp->b_rw_hint; bio_set_op_attrs(bio, op, op_flags); for (; size && nr_pages; nr_pages--, page_index++) {
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index b9f5511..db138e5 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h@@ -197,6 +197,13 @@ typedef struct xfs_buf { unsigned long b_first_retry_time; /* in jiffies */ int b_last_error; + /* + * If b_rw_hint is set before a read, it specifies an alternate mirror + * to read from. Upon bio completion, b_rw_hint stores the last mirror + * that was read from + */ + unsigned short b_rw_hint; + const struct xfs_buf_ops *b_ops; } xfs_buf_t;
--
2.7.4