From c6194271f94b81042bbc45034d31f9b0920f3905 Mon Sep 17 00:00:00 2001 From: Weston Andros Adamson Date: Thu, 15 May 2014 11:56:56 -0400 Subject: [PATCH] pnfs: filelayout: support non page aligned layouts Use the new pg_test interface to adjust requests to fit in the current stripe / segment. Signed-off-by: Weston Andros Adamson Signed-off-by: Trond Myklebust --- fs/nfs/nfs4filelayout.c | 52 +++++++++++++++++++------------------------------ 1 file changed, 20 insertions(+), 32 deletions(-) diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 0ebc521ea6fc..63a16375660a 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -639,7 +639,6 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo, struct nfs4_deviceid_node *d; struct nfs4_file_layout_dsaddr *dsaddr; int status = -EINVAL; - struct nfs_server *nfss = NFS_SERVER(lo->plh_inode); dprintk("--> %s\n", __func__); @@ -657,7 +656,7 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo, goto out; } - if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) { + if (!fl->stripe_unit) { dprintk("%s Invalid stripe unit (%u)\n", __func__, fl->stripe_unit); goto out; @@ -694,12 +693,6 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo, goto out_put; } - if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) { - dprintk("%s Stripe unit (%u) not aligned with rsize %u " - "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize, - nfss->wsize); - } - status = 0; out: dprintk("--> %s returns %d\n", __func__, status); @@ -936,44 +929,42 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, { unsigned int size; u64 p_stripe, r_stripe; - u32 stripe_unit; + u32 stripe_offset; + u64 segment_offset = pgio->pg_lseg->pls_range.offset; + u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; /* calls nfs_generic_pg_test */ size = pnfs_generic_pg_test(pgio, prev, req); if (!size) return 0; + /* see if req and prev are in the same stripe */ if (prev) { - p_stripe = (u64)req_offset(prev); - r_stripe = (u64)req_offset(req); - stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; - + p_stripe = (u64)req_offset(prev) - segment_offset; + r_stripe = (u64)req_offset(req) - segment_offset; do_div(p_stripe, stripe_unit); do_div(r_stripe, stripe_unit); if (p_stripe != r_stripe) return 0; } - return min(size, req->wb_bytes); + + /* calculate remaining bytes in the current stripe */ + div_u64_rem((u64)req_offset(req) - segment_offset, + stripe_unit, + &stripe_offset); + WARN_ON_ONCE(stripe_offset > stripe_unit); + if (stripe_offset >= stripe_unit) + return 0; + return min(stripe_unit - (unsigned int)stripe_offset, size); } static void filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) { - WARN_ON_ONCE(pgio->pg_lseg != NULL); - - if (req->wb_offset != req->wb_pgbase) { - /* - * Handling unaligned pages is difficult, because have to - * somehow split a req in two in certain cases in the - * pg.test code. Avoid this by just not using pnfs - * in this case. - */ - nfs_pageio_reset_read_mds(pgio); - return; - } - pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, + if (!pgio->pg_lseg) + pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, 0, NFS4_MAX_UINT64, @@ -991,11 +982,8 @@ filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_commit_info cinfo; int status; - WARN_ON_ONCE(pgio->pg_lseg != NULL); - - if (req->wb_offset != req->wb_pgbase) - goto out_mds; - pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, + if (!pgio->pg_lseg) + pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, 0, NFS4_MAX_UINT64, -- 2.11.0