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f2fs: implement iomap operations 

Implement 'struct iomap_ops' for f2fs, in preparation for making f2fs
use iomap for direct I/O.

Note that this may be used for other things besides direct I/O in the
future; however, for now I've only tested it for direct I/O.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Eric Biggers 2021-07-23 00:59:20 -07:00 committed by Jaegeuk Kim
parent ccf7cf9237
commit 1517c1a7a4
3 changed files with 58 additions and 0 deletions
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1
fs/f2fs/Kconfig
View File

@ -7,6 +7,7 @@ config F2FS_FS
select CRYPTO_CRC32
select F2FS_FS_XATTR if FS_ENCRYPTION
select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
select FS_IOMAP
select LZ4_COMPRESS if F2FS_FS_LZ4
select LZ4_DECOMPRESS if F2FS_FS_LZ4
select LZ4HC_COMPRESS if F2FS_FS_LZ4HC

56
fs/f2fs/data.c
View File

@ -21,6 +21,7 @@
#include <linux/cleancache.h>
#include <linux/sched/signal.h>
#include <linux/fiemap.h>
#include <linux/iomap.h>
#include "f2fs.h"
#include "node.h"
@ -4237,3 +4238,58 @@ void f2fs_destroy_bio_entry_cache(void)
{
kmem_cache_destroy(bio_entry_slab);
}
static int f2fs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
unsigned int flags, struct iomap *iomap,
struct iomap *srcmap)
{
struct f2fs_map_blocks map = {};
pgoff_t next_pgofs = 0;
int err;
map.m_lblk = bytes_to_blks(inode, offset);
map.m_len = bytes_to_blks(inode, offset + length - 1) - map.m_lblk + 1;
map.m_next_pgofs = &next_pgofs;
map.m_seg_type = f2fs_rw_hint_to_seg_type(inode->i_write_hint);
if (flags & IOMAP_WRITE)
map.m_may_create = true;
err = f2fs_map_blocks(inode, &map, flags & IOMAP_WRITE,
F2FS_GET_BLOCK_DIO);
if (err)
return err;
iomap->offset = blks_to_bytes(inode, map.m_lblk);
if (map.m_flags & (F2FS_MAP_MAPPED | F2FS_MAP_UNWRITTEN)) {
iomap->length = blks_to_bytes(inode, map.m_len);
if (map.m_flags & F2FS_MAP_MAPPED) {
iomap->type = IOMAP_MAPPED;
iomap->flags |= IOMAP_F_MERGED;
} else {
iomap->type = IOMAP_UNWRITTEN;
}
if (WARN_ON_ONCE(!__is_valid_data_blkaddr(map.m_pblk)))
return -EINVAL;
iomap->bdev = map.m_bdev;
iomap->addr = blks_to_bytes(inode, map.m_pblk);
} else {
iomap->length = blks_to_bytes(inode, next_pgofs) -
iomap->offset;
iomap->type = IOMAP_HOLE;
iomap->addr = IOMAP_NULL_ADDR;
}
if (map.m_flags & F2FS_MAP_NEW)
iomap->flags |= IOMAP_F_NEW;
if ((inode->i_state & I_DIRTY_DATASYNC) ||
offset + length > i_size_read(inode))
iomap->flags |= IOMAP_F_DIRTY;
return 0;
}
const struct iomap_ops f2fs_iomap_ops = {
.iomap_begin = f2fs_iomap_begin,
};

1
fs/f2fs/f2fs.h
View File

@ -3655,6 +3655,7 @@ int f2fs_init_post_read_processing(void);
void f2fs_destroy_post_read_processing(void);
int f2fs_init_post_read_wq(struct f2fs_sb_info *sbi);
void f2fs_destroy_post_read_wq(struct f2fs_sb_info *sbi);
extern const struct iomap_ops f2fs_iomap_ops;
/*
* gc.c