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pnfs-obj: pg_test check for max_io_size

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Implement pg_test vector to test for max IO sizes. We calculate
a max_io_size member only once, and cache it in lseg so to not
do so on every page insert.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
[simplify logic]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Boaz Harrosh 2011-05-25 21:25:29 +03:00
parent 5b36c7dc41
commit 9342077011
1 changed files with 18 additions and 1 deletions
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19
fs/nfs/objlayout/objio_osd.c
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@ -128,6 +128,8 @@ struct objio_segment {
u64 group_depth;
unsigned group_count;
unsigned max_io_size;
unsigned comps_index;
unsigned num_comps;
/* variable length */
@ -365,6 +367,11 @@ int objio_alloc_lseg(struct pnfs_layout_segment **outp,
objio_seg->group_count = 1;
}
/* Cache this calculation it will hit for every page */
objio_seg->max_io_size = (BIO_MAX_PAGES_KMALLOC * PAGE_SIZE -
objio_seg->stripe_unit) *
objio_seg->group_width;
*outp = &objio_seg->lseg;
return 0;
@ -988,6 +995,16 @@ ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable)
return _write_exec(ios);
}
static bool objio_pg_test(struct nfs_pageio_descriptor *pgio,
struct nfs_page *prev, struct nfs_page *req)
{
if (!pnfs_generic_pg_test(pgio, prev, req))
return false;
return pgio->pg_count + req->wb_bytes <=
OBJIO_LSEG(pgio->pg_lseg)->max_io_size;
}
static struct pnfs_layoutdriver_type objlayout_type = {
.id = LAYOUT_OSD2_OBJECTS,
.name = "LAYOUT_OSD2_OBJECTS",
@ -1001,7 +1018,7 @@ static struct pnfs_layoutdriver_type objlayout_type = {
.read_pagelist = objlayout_read_pagelist,
.write_pagelist = objlayout_write_pagelist,
.pg_test = pnfs_generic_pg_test,
.pg_test = objio_pg_test,
.free_deviceid_node = objio_free_deviceid_node,