Commit 8cecd0ba authored by Goldwyn Rodrigues's avatar Goldwyn Rodrigues Committed by David Sterba

iomap: add a filesystem hook for direct I/O bio submission

This helps filesystems to perform tasks on the bio while submitting for
I/O. This could be post-write operations such as data CRC or data
replication for fs-handled RAID.
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent d85dc2e1
...@@ -59,7 +59,7 @@ int iomap_dio_iopoll(struct kiocb *kiocb, bool spin) ...@@ -59,7 +59,7 @@ int iomap_dio_iopoll(struct kiocb *kiocb, bool spin)
EXPORT_SYMBOL_GPL(iomap_dio_iopoll); EXPORT_SYMBOL_GPL(iomap_dio_iopoll);
static void iomap_dio_submit_bio(struct iomap_dio *dio, struct iomap *iomap, static void iomap_dio_submit_bio(struct iomap_dio *dio, struct iomap *iomap,
struct bio *bio) struct bio *bio, loff_t pos)
{ {
atomic_inc(&dio->ref); atomic_inc(&dio->ref);
...@@ -67,7 +67,12 @@ static void iomap_dio_submit_bio(struct iomap_dio *dio, struct iomap *iomap, ...@@ -67,7 +67,12 @@ static void iomap_dio_submit_bio(struct iomap_dio *dio, struct iomap *iomap,
bio_set_polled(bio, dio->iocb); bio_set_polled(bio, dio->iocb);
dio->submit.last_queue = bdev_get_queue(iomap->bdev); dio->submit.last_queue = bdev_get_queue(iomap->bdev);
dio->submit.cookie = submit_bio(bio); if (dio->dops && dio->dops->submit_io)
dio->submit.cookie = dio->dops->submit_io(
file_inode(dio->iocb->ki_filp),
iomap, bio, pos);
else
dio->submit.cookie = submit_bio(bio);
} }
static ssize_t iomap_dio_complete(struct iomap_dio *dio) static ssize_t iomap_dio_complete(struct iomap_dio *dio)
...@@ -191,7 +196,7 @@ iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos, ...@@ -191,7 +196,7 @@ iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
get_page(page); get_page(page);
__bio_add_page(bio, page, len, 0); __bio_add_page(bio, page, len, 0);
bio_set_op_attrs(bio, REQ_OP_WRITE, flags); bio_set_op_attrs(bio, REQ_OP_WRITE, flags);
iomap_dio_submit_bio(dio, iomap, bio); iomap_dio_submit_bio(dio, iomap, bio, pos);
} }
static loff_t static loff_t
...@@ -299,11 +304,11 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length, ...@@ -299,11 +304,11 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
} }
dio->size += n; dio->size += n;
pos += n;
copied += n; copied += n;
nr_pages = iov_iter_npages(dio->submit.iter, BIO_MAX_PAGES); nr_pages = iov_iter_npages(dio->submit.iter, BIO_MAX_PAGES);
iomap_dio_submit_bio(dio, iomap, bio); iomap_dio_submit_bio(dio, iomap, bio, pos);
pos += n;
} while (nr_pages); } while (nr_pages);
/* /*
......
...@@ -252,6 +252,8 @@ int iomap_writepages(struct address_space *mapping, ...@@ -252,6 +252,8 @@ int iomap_writepages(struct address_space *mapping,
struct iomap_dio_ops { struct iomap_dio_ops {
int (*end_io)(struct kiocb *iocb, ssize_t size, int error, int (*end_io)(struct kiocb *iocb, ssize_t size, int error,
unsigned flags); unsigned flags);
blk_qc_t (*submit_io)(struct inode *inode, struct iomap *iomap,
struct bio *bio, loff_t file_offset);
}; };
ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
......
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