From b3230e80a6d115d2eb50fe3f4794ad04d84766de Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 25 Apr 2017 10:56:19 -0400 Subject: pNFS: Ensure we check layout segment validity in the pg_init() callback If we have a layout segment cached in pgio->pg_lseg, we should check it for validity before reusing it in a new RPC request. Otherwise, if we recoalesce, we can end up looping forever. Signed-off-by: Trond Myklebust --- fs/nfs/filelayout/filelayout.c | 2 ++ fs/nfs/flexfilelayout/flexfilelayout.c | 2 ++ fs/nfs/pnfs.c | 13 +++++++++++++ fs/nfs/pnfs.h | 1 + 4 files changed, 18 insertions(+) (limited to 'fs/nfs') diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c index acd30ba..d4174da 100644 --- a/fs/nfs/filelayout/filelayout.c +++ b/fs/nfs/filelayout/filelayout.c @@ -933,6 +933,7 @@ static void filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) { + pnfs_generic_pg_check_layout(pgio); if (!pgio->pg_lseg) { pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, req->wb_context, @@ -959,6 +960,7 @@ filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_commit_info cinfo; int status; + pnfs_generic_pg_check_layout(pgio); if (!pgio->pg_lseg) { pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, req->wb_context, diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index 42dedf2..f23b63e 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -846,6 +846,7 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, int ds_idx; retry: + pnfs_generic_pg_check_layout(pgio); /* Use full layout for now */ if (!pgio->pg_lseg) ff_layout_pg_get_read(pgio, req, false); @@ -894,6 +895,7 @@ ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, int status; retry: + pnfs_generic_pg_check_layout(pgio); if (!pgio->pg_lseg) { pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 3917a62..634adb3 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -2073,10 +2073,22 @@ void pnfs_error_mark_layout_for_return(struct inode *inode, EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); void +pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) +{ + if (pgio->pg_lseg == NULL || + test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) + return; + pnfs_put_lseg(pgio->pg_lseg); + pgio->pg_lseg = NULL; +} +EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); + +void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) { u64 rd_size = req->wb_bytes; + pnfs_generic_pg_check_layout(pgio); if (pgio->pg_lseg == NULL) { if (pgio->pg_dreq == NULL) rd_size = i_size_read(pgio->pg_inode) - req_offset(req); @@ -2107,6 +2119,7 @@ void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req, u64 wb_size) { + pnfs_generic_pg_check_layout(pgio); if (pgio->pg_lseg == NULL) { pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, req->wb_context, diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index 825a1b8..2d05b75 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -234,6 +234,7 @@ void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg); void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *); void unset_pnfs_layoutdriver(struct nfs_server *); +void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio); void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, -- cgit v1.1