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    Subject[PATCH 5/6] f2fs: implement iomap operations
    Date
    From: Eric Biggers <ebiggers@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 <ebiggers@google.com>
    Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
    ---
    fs/f2fs/Kconfig | 1 +
    fs/f2fs/data.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++
    fs/f2fs/f2fs.h | 1 +
    3 files changed, 60 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 7ac1a39fcad2..43b3ca7cabe0 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"
    @@ -4236,3 +4237,60 @@ 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->addr = blks_to_bytes(inode, map.m_pblk);
    +
    + if (WARN_ON_ONCE(f2fs_is_multi_device(F2FS_I_SB(inode))))
    + return -EINVAL;
    + iomap->bdev = inode->i_sb->s_bdev;
    + } 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 14bea669f87e..0d199e8f2c1d 100644
    --- a/fs/f2fs/f2fs.h
    +++ b/fs/f2fs/f2fs.h
    @@ -3654,6 +3654,7 @@ 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
    --
    2.34.0.rc1.387.gb447b232ab-goog
    \
     
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