gfs2: iomap buffered write support

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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>

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This commit is contained in:

Andreas Gruenbacher 2018-06-24 15:04:04 +01:00

parent d505a96a3b

commit 64bc06bb32

4 changed files with 338 additions and 43 deletions

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20

fs/gfs2/aops.c

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19

fs/gfs2/aops.h

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298

fs/gfs2/bmap.c

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44

fs/gfs2/file.c

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