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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /fs/xfs/xfs_bio_io.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/xfs/xfs_bio_io.c')
-rw-r--r--fs/xfs/xfs_bio_io.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bio_io.c b/fs/xfs/xfs_bio_io.c
new file mode 100644
index 000000000..fe21c76f7
--- /dev/null
+++ b/fs/xfs/xfs_bio_io.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Christoph Hellwig.
+ */
+#include "xfs.h"
+
+static inline unsigned int bio_max_vecs(unsigned int count)
+{
+ return bio_max_segs(howmany(count, PAGE_SIZE));
+}
+
+int
+xfs_rw_bdev(
+ struct block_device *bdev,
+ sector_t sector,
+ unsigned int count,
+ char *data,
+ enum req_op op)
+
+{
+ unsigned int is_vmalloc = is_vmalloc_addr(data);
+ unsigned int left = count;
+ int error;
+ struct bio *bio;
+
+ if (is_vmalloc && op == REQ_OP_WRITE)
+ flush_kernel_vmap_range(data, count);
+
+ bio = bio_alloc(bdev, bio_max_vecs(left), op | REQ_META | REQ_SYNC,
+ GFP_KERNEL);
+ bio->bi_iter.bi_sector = sector;
+
+ do {
+ struct page *page = kmem_to_page(data);
+ unsigned int off = offset_in_page(data);
+ unsigned int len = min_t(unsigned, left, PAGE_SIZE - off);
+
+ while (bio_add_page(bio, page, len, off) != len) {
+ struct bio *prev = bio;
+
+ bio = bio_alloc(prev->bi_bdev, bio_max_vecs(left),
+ prev->bi_opf, GFP_KERNEL);
+ bio->bi_iter.bi_sector = bio_end_sector(prev);
+ bio_chain(prev, bio);
+
+ submit_bio(prev);
+ }
+
+ data += len;
+ left -= len;
+ } while (left > 0);
+
+ error = submit_bio_wait(bio);
+ bio_put(bio);
+
+ if (is_vmalloc && op == REQ_OP_READ)
+ invalidate_kernel_vmap_range(data, count);
+ return error;
+}