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NFSv4.1: coelesce across layout stripes

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Add a pg_test layout driver hook which is used to avoid coelescing I/O across
layout stripes.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Dean Hildebrand <dhildeb@us.ibm.com>
Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Tao Guo <guotao@nrchpc.ac.cn>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman
2011-03-01 01:34:14 +00:00
committed by Trond Myklebust
parent d684d2ae10
commit 94ad1c80e2
7 changed files with 70 additions and 2 deletions
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16
fs/nfs/pnfs.c
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@ -858,6 +858,22 @@ out_forget_reply:
goto out;
}
static void
pnfs_set_pg_test(struct inode *inode, struct nfs_pageio_descriptor *pgio)
{
struct pnfs_layoutdriver_type *ld;
ld = NFS_SERVER(inode)->pnfs_curr_ld;
pgio->pg_test = (ld ? ld->pg_test : NULL);
}
void
pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
struct inode *inode)
{
pnfs_set_pg_test(inode, pgio);
}
/*
* Device ID cache. Currently supports one layout type per struct nfs_client.
* Add layout type to the lookup key to expand to support multiple types.