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    Subject[PATCH v2 05/35] vfs: export vfs_dedupe_file_range_one() to modules
    Date
    This is needed by the stacked dedupe implementation in overlayfs.

    Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
    ---
    fs/read_write.c | 6 +++---
    include/linux/fs.h | 4 ++++
    2 files changed, 7 insertions(+), 3 deletions(-)

    diff --git a/fs/read_write.c b/fs/read_write.c
    index 023df230e2a0..08708f903fc5 100644
    --- a/fs/read_write.c
    +++ b/fs/read_write.c
    @@ -1964,9 +1964,8 @@ int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff,
    }
    EXPORT_SYMBOL(vfs_dedupe_file_range_compare);

    -static s64 vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
    - struct file *dst_file, loff_t dst_pos,
    - u64 len)
    +s64 vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
    + struct file *dst_file, loff_t dst_pos, u64 len)
    {
    s64 ret;

    @@ -2001,6 +2000,7 @@ static s64 vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,

    return ret;
    }
    +EXPORT_SYMBOL(vfs_dedupe_file_range_one);

    int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
    {
    diff --git a/include/linux/fs.h b/include/linux/fs.h
    index 26685011c4bd..c85a8059f038 100644
    --- a/include/linux/fs.h
    +++ b/include/linux/fs.h
    @@ -1817,6 +1817,10 @@ extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff,
    loff_t len, bool *is_same);
    extern int vfs_dedupe_file_range(struct file *file,
    struct file_dedupe_range *same);
    +extern s64 vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
    + struct file *dst_file, loff_t dst_pos,
    + u64 len);
    +

    struct super_operations {
    struct inode *(*alloc_inode)(struct super_block *sb);
    --
    2.14.3
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