From: Eric Biggers <ebigg...@google.com>
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 <ebigg...@google.com>
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
fs/f2fs/Kconfig | 1 +
fs/f2fs/data.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
fs/f2fs/f2fs.h | 1 +
3 files changed, 58 insertions(+)
diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig
index 7eea3cfd894d..f46a7339d6cf 100644
--- a/fs/f2fs/Kconfig
+++ b/fs/f2fs/Kconfig
@@ -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
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9c867de1ec29..57e6a6f0daf9 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -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,
+};
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d7435fcb9658..8242f47304a5 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -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
--
2.34.1.448.ga2b2bfdf31-goog
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