From 2b83d3de4c18af49800e0b26ae013db4fcf43a4a Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 5 Jul 2015 20:06:38 -0400 Subject: NFSv4/pnfs: Ensure we don't miss a file extension pNFS writes don't return attributes, however that doesn't mean that we should ignore the fact that they may be extending the file. This patch ensures that if a write is seen to extend the file, then we always set an attribute barrier, and update the cached file size. Signed-off-by: Trond Myklebust --- fs/nfs/write.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) (limited to 'fs/nfs/write.c') diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 359e9ad596c9..0e6a2b8786b4 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1378,24 +1378,27 @@ static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr, { struct nfs_pgio_args *argp = &hdr->args; struct nfs_pgio_res *resp = &hdr->res; + u64 size = argp->offset + resp->count; if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) + fattr->size = size; + if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) { + fattr->valid &= ~NFS_ATTR_FATTR_SIZE; return; - if (argp->offset + resp->count != fattr->size) - return; - if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) + } + if (size != fattr->size) return; /* Set attribute barrier */ nfs_fattr_set_barrier(fattr); + /* ...and update size */ + fattr->valid |= NFS_ATTR_FATTR_SIZE; } void nfs_writeback_update_inode(struct nfs_pgio_header *hdr) { - struct nfs_fattr *fattr = hdr->res.fattr; + struct nfs_fattr *fattr = &hdr->fattr; struct inode *inode = hdr->inode; - if (fattr == NULL) - return; spin_lock(&inode->i_lock); nfs_writeback_check_extend(hdr, fattr); nfs_post_op_update_inode_force_wcc_locked(inode, fattr); -- cgit v1.2.3-70-g09d2 From 86d80f973434de24d8a807a92cd59d5ced7bd519 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 31 Jul 2015 16:24:30 -0400 Subject: NFSv4.1/pnfs: Fix atomicity of commit list updates pnfs_layout_mark_request_commit() needs to ensure that it adds the request to the commit list atomically with all the other updates in order to prevent corruption to buckets[ds_commit_idx].wlseg due to races with pnfs_generic_clear_request_commit(). Fixes: 338d00cfef07d ("pnfs: Refactor the *_layout_mark_request_commit...") Cc: stable@vger.kernel.org # v4.0+ Signed-off-by: Trond Myklebust --- fs/nfs/internal.h | 15 ++++++++++----- fs/nfs/pnfs_nfs.c | 5 +++-- fs/nfs/write.c | 29 ++++++++++++++++++++++++----- 3 files changed, 37 insertions(+), 12 deletions(-) (limited to 'fs/nfs/write.c') diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 9b372b845f6a..1dad18105ed0 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -490,6 +490,9 @@ void nfs_retry_commit(struct list_head *page_list, void nfs_commitdata_release(struct nfs_commit_data *data); void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, struct nfs_commit_info *cinfo); +void nfs_request_add_commit_list_locked(struct nfs_page *req, + struct list_head *dst, + struct nfs_commit_info *cinfo); void nfs_request_remove_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo); void nfs_init_cinfo(struct nfs_commit_info *cinfo, @@ -623,13 +626,15 @@ void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) * Record the page as unstable and mark its inode as dirty. */ static inline -void nfs_mark_page_unstable(struct page *page) +void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) { - struct inode *inode = page_file_mapping(page)->host; + if (!cinfo->dreq) { + struct inode *inode = page_file_mapping(page)->host; - inc_zone_page_state(page, NR_UNSTABLE_NFS); - inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); - __mark_inode_dirty(inode, I_DIRTY_DATASYNC); + inc_zone_page_state(page, NR_UNSTABLE_NFS); + inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); + __mark_inode_dirty(inode, I_DIRTY_DATASYNC); + } } /* diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c index f37e25b6311c..7a282876662f 100644 --- a/fs/nfs/pnfs_nfs.c +++ b/fs/nfs/pnfs_nfs.c @@ -863,9 +863,10 @@ pnfs_layout_mark_request_commit(struct nfs_page *req, } set_bit(PG_COMMIT_TO_DS, &req->wb_flags); cinfo->ds->nwritten++; - spin_unlock(cinfo->lock); - nfs_request_add_commit_list(req, list, cinfo); + nfs_request_add_commit_list_locked(req, list, cinfo); + spin_unlock(cinfo->lock); + nfs_mark_page_unstable(req->wb_page, cinfo); } EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 75a35a1afa79..fdee9270ca15 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -767,6 +767,28 @@ nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi, return NULL; } +/** + * nfs_request_add_commit_list_locked - add request to a commit list + * @req: pointer to a struct nfs_page + * @dst: commit list head + * @cinfo: holds list lock and accounting info + * + * This sets the PG_CLEAN bit, updates the cinfo count of + * number of outstanding requests requiring a commit as well as + * the MM page stats. + * + * The caller must hold the cinfo->lock, and the nfs_page lock. + */ +void +nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst, + struct nfs_commit_info *cinfo) +{ + set_bit(PG_CLEAN, &req->wb_flags); + nfs_list_add_request(req, dst); + cinfo->mds->ncommit++; +} +EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked); + /** * nfs_request_add_commit_list - add request to a commit list * @req: pointer to a struct nfs_page @@ -784,13 +806,10 @@ void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, struct nfs_commit_info *cinfo) { - set_bit(PG_CLEAN, &(req)->wb_flags); spin_lock(cinfo->lock); - nfs_list_add_request(req, dst); - cinfo->mds->ncommit++; + nfs_request_add_commit_list_locked(req, dst, cinfo); spin_unlock(cinfo->lock); - if (!cinfo->dreq) - nfs_mark_page_unstable(req->wb_page); + nfs_mark_page_unstable(req->wb_page, cinfo); } EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); -- cgit v1.2.3-70-g09d2 From ae09c31f66cc673bb8c64a5dbfdc04ab67f66d7e Mon Sep 17 00:00:00 2001 From: Anna Schumaker Date: Mon, 13 Jul 2015 14:01:32 -0400 Subject: NFS: Rename nfs_commit_unstable_pages() to nfs_write_inode() All nfs_write_inode() does is pass its arguments to nfs_commit_unstable_pages(). Let's cut out the middle man and have nfs_write_pages() do the work directly. Signed-off-by: Anna Schumaker Signed-off-by: Trond Myklebust --- fs/nfs/write.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) (limited to 'fs/nfs/write.c') diff --git a/fs/nfs/write.c b/fs/nfs/write.c index fdee9270ca15..388f48079c43 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1812,7 +1812,7 @@ out_mark_dirty: return res; } -static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) +int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) { struct nfs_inode *nfsi = NFS_I(inode); int flags = FLUSH_SYNC; @@ -1847,11 +1847,6 @@ out_mark_dirty: __mark_inode_dirty(inode, I_DIRTY_DATASYNC); return ret; } - -int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) -{ - return nfs_commit_unstable_pages(inode, wbc); -} EXPORT_SYMBOL_GPL(nfs_write_inode); /* -- cgit v1.2.3-70-g09d2