diff options
Diffstat (limited to 'fs/nfs/nfs4filelayout.c')
| -rw-r--r-- | fs/nfs/nfs4filelayout.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 23f930caf1e2..0efe8cbd9e3c 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -252,6 +252,31 @@ filelayout_free_lseg(struct pnfs_layout_segment *lseg) _filelayout_free_lseg(fl); } +/* + * filelayout_pg_test(). Called by nfs_can_coalesce_requests() + * + * return 1 : coalesce page + * return 0 : don't coalesce page + */ +int +filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, + struct nfs_page *req) +{ + u64 p_stripe, r_stripe; + u32 stripe_unit; + + if (!pgio->pg_lseg) + return 1; + p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT; + r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT; + stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; + + do_div(p_stripe, stripe_unit); + do_div(r_stripe, stripe_unit); + + return (p_stripe == r_stripe); +} + static struct pnfs_layoutdriver_type filelayout_type = { .id = LAYOUT_NFSV4_1_FILES, .name = "LAYOUT_NFSV4_1_FILES", @@ -260,6 +285,7 @@ static struct pnfs_layoutdriver_type filelayout_type = { .clear_layoutdriver = filelayout_clear_layoutdriver, .alloc_lseg = filelayout_alloc_lseg, .free_lseg = filelayout_free_lseg, + .pg_test = filelayout_pg_test, }; static int __init nfs4filelayout_init(void) |