On Fri, May 31, 2019 at 06:01:14PM +0300, Nikolay Borisov wrote: > --- > fs/btrfs/volumes.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++ > fs/btrfs/volumes.h | 2 + > 2 files changed, 100 insertions(+) > > diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c > index 776f5c7ca7c5..b130f465ca6d 100644 > --- a/fs/btrfs/volumes.c > +++ b/fs/btrfs/volumes.c > @@ -5907,6 +5907,104 @@ static bool need_full_stripe(enum btrfs_map_op op) > return (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS); > } > > +/* > + * btrfs_io_geometry - calculates the geomery of a particular (address, len) > + * tuple. This information is used to calculate how big a > + * particular bio can get before it straddles a stripe. > + * > + * @fs_info - The omnipresent btrfs structure > + * @logical - Address that we want to figure out the geometry of > + * @len - The length of IO we are going to perform, starting at @logical > + * @op - Type of operation - Write or Read > + * @io_geom - Pointer used to return values > + * > + * Returns < 0 in case a chunk for the given logical address cannot be found, > + * usually shouldn't happen unless @logical is corrupted, 0 otherwise. > + */ > +int btrfs_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op, > + u64 logical, u64 len, struct btrfs_io_geometry *io_geom) Where is struct btrfs_io_geometry defined? And changelog and signed-off-by are missing.
