tree c87afdeaf0cd1c34ad4cf57c64a9a2c4678d84da
parent d505a96a3b16f46455035dc0296bc2da6014e163
author Andreas Gruenbacher <agruenba@redhat.com> 1529849044 +0100
committer Andreas Gruenbacher <agruenba@redhat.com> 1530545237 +0100

gfs2: iomap buffered write support

With the traditional page-based writes, blocks are allocated separately
for each page written to.  With iomap writes, we can allocate a lot more
blocks at once, with a fraction of the allocation overhead for each
page.

Split calculating the number of blocks that can be allocated at a given
position (gfs2_alloc_size) off from gfs2_iomap_alloc: that size
determines the number of blocks to allocate and reserve in the journal.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>