From 48d635f14a544c2b3ca870d2c7349b41160496d2 Mon Sep 17 00:00:00 2001 From: Peng Tao Date: Mon, 10 Nov 2014 08:35:35 +0800 Subject: [PATCH] nfs: add nfs_pgio_current_mirror helper Let it return current nfs_pgio_mirror in use depending on pg_mirror_count. For read, we always use pg_mirrors[0], so this effectively gives us freedom to use pg_mirror_idx to track the actual mirror to read from through out the IO stack. Signed-off-by: Peng Tao Signed-off-by: Tom Haynes --- fs/nfs/internal.h | 2 ++ fs/nfs/objlayout/objio_osd.c | 2 +- fs/nfs/pagelist.c | 25 +++++++++++++++++-------- fs/nfs/pnfs.c | 9 ++++----- 4 files changed, 24 insertions(+), 14 deletions(-) diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 5be06bc..ffe4b7a 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -255,6 +255,8 @@ int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, const struct rpc_call_ops *call_ops, int how, int flags); void nfs_free_request(struct nfs_page *req); +struct nfs_pgio_mirror * +nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); static inline void nfs_iocounter_init(struct nfs_io_counter *c) { diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c index 9a5f2ee6..24e1d74 100644 --- a/fs/nfs/objlayout/objio_osd.c +++ b/fs/nfs/objlayout/objio_osd.c @@ -537,7 +537,7 @@ int objio_write_pagelist(struct nfs_pgio_header *hdr, int how) static size_t objio_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req) { - struct nfs_pgio_mirror *mirror = &pgio->pg_mirrors[pgio->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(pgio); unsigned int size; size = pnfs_generic_pg_test(pgio, prev, req); diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c index f9d8c46..960c99f 100644 --- a/fs/nfs/pagelist.c +++ b/fs/nfs/pagelist.c @@ -42,11 +42,20 @@ static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount) return p->pagevec != NULL; } +struct nfs_pgio_mirror * +nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc) +{ + return nfs_pgio_has_mirroring(desc) ? + &desc->pg_mirrors[desc->pg_mirror_idx] : + &desc->pg_mirrors[0]; +} +EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror); + void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr, void (*release)(struct nfs_pgio_header *hdr)) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); hdr->req = nfs_list_entry(mirror->pg_list.next); @@ -485,7 +494,7 @@ nfs_wait_on_request(struct nfs_page *req) size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, struct nfs_page *prev, struct nfs_page *req) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); if (mirror->pg_count > mirror->pg_bsize) { @@ -782,7 +791,7 @@ static void nfs_pgio_result(struct rpc_task *task, void *calldata) int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); struct nfs_page *req; struct page **pages, @@ -831,7 +840,7 @@ static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc) struct nfs_pgio_header *hdr; int ret; - mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + mirror = nfs_pgio_current_mirror(desc); hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); if (!hdr) { @@ -961,7 +970,7 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev, static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc, struct nfs_page *req) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); struct nfs_page *prev = NULL; @@ -985,7 +994,7 @@ static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc, */ static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); if (!list_empty(&mirror->pg_list)) { @@ -1015,7 +1024,7 @@ static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc) static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, struct nfs_page *req) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); struct nfs_page *subreq; unsigned int bytes_left = 0; @@ -1078,7 +1087,7 @@ err_ptr: static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); LIST_HEAD(head); do { diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index e123cfc..b822b17 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1731,7 +1731,7 @@ static void pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { list_splice_tail_init(&hdr->pages, &mirror->pg_list); @@ -1785,7 +1785,7 @@ EXPORT_SYMBOL_GPL(pnfs_writehdr_free); int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); struct nfs_pgio_header *hdr; int ret; @@ -1846,8 +1846,7 @@ static void pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; - + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { list_splice_tail_init(&hdr->pages, &mirror->pg_list); @@ -1903,7 +1902,7 @@ EXPORT_SYMBOL_GPL(pnfs_readhdr_free); int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) { - struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx]; + struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); struct nfs_pgio_header *hdr; int ret; -- 2.7.4