github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 00:53:34 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

iomap: allow file systems to hook into buffered read bio submission

Browse Source 
File systems such as btrfs have additional operations with bios such as
verifying data checksums.  Allow file systems to hook into submission
of the bio to allow for this processing by replacing the direct
submit_bio call in iomap_read_alloc_bio with a call into ->submit_read
and exporting iomap_read_alloc_bio.  Also add a new field to
struct iomap_read_folio_ctx to track the file logic offset of the current
read context.

Based on a patch from Goldwyn Rodrigues <rgoldwyn@suse.com>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260223132021.292832-12-hch@lst.de
Tested-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christoph Hellwig 2026-02-23 05:20:11 -08:00 committed by Christian Brauner
parent 19fb5f9780
commit 5f4fe046cb
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
fs/iomap/bio.c
View File

@ -32,10 +32,11 @@ static void iomap_read_alloc_bio(const struct iomap_iter *iter,
struct folio *folio = ctx->cur_folio;
gfp_t gfp = mapping_gfp_constraint(folio->mapping, GFP_KERNEL);
gfp_t orig_gfp = gfp;
struct bio *bio = ctx->read_ctx;
struct bio *bio;
if (bio)
submit_bio(bio);
/* Submit the existing range if there was one. */
if (ctx->read_ctx)
ctx->ops->submit_read(iter, ctx);
/* Same as readahead_gfp_mask: */
if (ctx->rac)
@ -56,9 +57,10 @@ static void iomap_read_alloc_bio(const struct iomap_iter *iter,
bio_add_folio_nofail(bio, folio, plen,
offset_in_folio(folio, iter->pos));
ctx->read_ctx = bio;
ctx->read_ctx_file_offset = iter->pos;
}
static int iomap_bio_read_folio_range(const struct iomap_iter *iter,
int iomap_bio_read_folio_range(const struct iomap_iter *iter,
struct iomap_read_folio_ctx *ctx, size_t plen)
{
struct folio *folio = ctx->cur_folio;
@ -70,10 +72,11 @@ static int iomap_bio_read_folio_range(const struct iomap_iter *iter,
iomap_read_alloc_bio(iter, ctx, plen);
return 0;
}
EXPORT_SYMBOL_GPL(iomap_bio_read_folio_range);
const struct iomap_read_ops iomap_bio_read_ops = {
.read_folio_range = iomap_bio_read_folio_range,
.submit_read = iomap_bio_submit_read,
.read_folio_range = iomap_bio_read_folio_range,
.submit_read = iomap_bio_submit_read,
};
EXPORT_SYMBOL_GPL(iomap_bio_read_ops);

4
include/linux/iomap.h
View File

@ -493,6 +493,7 @@ struct iomap_read_folio_ctx {
struct folio *cur_folio;
struct readahead_control *rac;
void *read_ctx;
loff_t read_ctx_file_offset;
};
struct iomap_read_ops {
@ -599,6 +600,9 @@ int iomap_swapfile_activate(struct swap_info_struct *sis,
extern struct bio_set iomap_ioend_bioset;
#ifdef CONFIG_BLOCK
int iomap_bio_read_folio_range(const struct iomap_iter *iter,
struct iomap_read_folio_ctx *ctx, size_t plen);
extern const struct iomap_read_ops iomap_bio_read_ops;
static inline void iomap_bio_read_folio(struct folio *folio,