From e0c2b3801828aadb65dec9f67f7c6b7a675ad007 Mon Sep 17 00:00:00 2001 From: Fred Isaman Date: Wed, 23 Mar 2011 13:27:53 +0000 Subject: NFSv4.1: filelayout driver specific code for COMMIT Implement all the hooks created in the previous patches. This requires exporting quite a few functions and adding a few structure fields. Signed-off-by: Fred Isaman Signed-off-by: Trond Myklebust --- fs/nfs/nfs4filelayout.c | 235 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 235 insertions(+) (limited to 'fs/nfs/nfs4filelayout.c') diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 03ff80c67c6e..97e75a22af72 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -213,6 +213,37 @@ static int filelayout_write_done_cb(struct rpc_task *task, return 0; } +/* Fake up some data that will cause nfs_commit_release to retry the writes. */ +static void prepare_to_resend_writes(struct nfs_write_data *data) +{ + struct nfs_page *first = nfs_list_entry(data->pages.next); + + data->task.tk_status = 0; + memcpy(data->verf.verifier, first->wb_verf.verifier, + sizeof(first->wb_verf.verifier)); + data->verf.verifier[0]++; /* ensure verifier mismatch */ +} + +static int filelayout_commit_done_cb(struct rpc_task *task, + struct nfs_write_data *data) +{ + int reset = 0; + + if (filelayout_async_handle_error(task, data->args.context->state, + data->ds_clp, &reset) == -EAGAIN) { + dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", + __func__, data->ds_clp, data->ds_clp->cl_session); + if (reset) { + prepare_to_resend_writes(data); + filelayout_set_lo_fail(data->lseg); + } else + nfs_restart_rpc(task, data->ds_clp); + return -EAGAIN; + } + + return 0; +} + static void filelayout_write_prepare(struct rpc_task *task, void *data) { struct nfs_write_data *wdata = (struct nfs_write_data *)data; @@ -240,6 +271,16 @@ static void filelayout_write_release(void *data) wdata->mds_ops->rpc_release(data); } +static void filelayout_commit_release(void *data) +{ + struct nfs_write_data *wdata = (struct nfs_write_data *)data; + + nfs_commit_release_pages(wdata); + if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding)) + nfs_commit_clear_lock(NFS_I(wdata->inode)); + nfs_commitdata_release(wdata); +} + struct rpc_call_ops filelayout_read_call_ops = { .rpc_call_prepare = filelayout_read_prepare, .rpc_call_done = filelayout_read_call_done, @@ -252,6 +293,12 @@ struct rpc_call_ops filelayout_write_call_ops = { .rpc_release = filelayout_write_release, }; +struct rpc_call_ops filelayout_commit_call_ops = { + .rpc_call_prepare = filelayout_write_prepare, + .rpc_call_done = filelayout_write_call_done, + .rpc_release = filelayout_commit_release, +}; + static enum pnfs_try_status filelayout_read_pagelist(struct nfs_read_data *data) { @@ -574,6 +621,191 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, return (p_stripe == r_stripe); } +static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg) +{ + return !FILELAYOUT_LSEG(lseg)->commit_through_mds; +} + +static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) +{ + if (fl->stripe_type == STRIPE_SPARSE) + return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); + else + return j; +} + +struct list_head *filelayout_choose_commit_list(struct nfs_page *req) +{ + struct pnfs_layout_segment *lseg = req->wb_commit_lseg; + struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); + u32 i, j; + struct list_head *list; + + /* Note that we are calling nfs4_fl_calc_j_index on each page + * that ends up being committed to a data server. An attractive + * alternative is to add a field to nfs_write_data and nfs_page + * to store the value calculated in filelayout_write_pagelist + * and just use that here. + */ + j = nfs4_fl_calc_j_index(lseg, + (loff_t)req->wb_index << PAGE_CACHE_SHIFT); + i = select_bucket_index(fl, j); + list = &fl->commit_buckets[i]; + if (list_empty(list)) { + /* Non-empty buckets hold a reference on the lseg */ + get_lseg(lseg); + } + return list; +} + +static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) +{ + struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); + + if (flseg->stripe_type == STRIPE_SPARSE) + return i; + else + return nfs4_fl_calc_ds_index(lseg, i); +} + +static struct nfs_fh * +select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) +{ + struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); + + if (flseg->stripe_type == STRIPE_SPARSE) { + if (flseg->num_fh == 1) + i = 0; + else if (flseg->num_fh == 0) + /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ + return NULL; + } + return flseg->fh_array[i]; +} + +static int filelayout_initiate_commit(struct nfs_write_data *data, int how) +{ + struct pnfs_layout_segment *lseg = data->lseg; + struct nfs4_pnfs_ds *ds; + u32 idx; + struct nfs_fh *fh; + + idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); + ds = nfs4_fl_prepare_ds(lseg, idx); + if (!ds) { + printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); + set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); + set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); + prepare_to_resend_writes(data); + data->mds_ops->rpc_release(data); + return -EAGAIN; + } + dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how); + data->write_done_cb = filelayout_commit_done_cb; + data->ds_clp = ds->ds_clp; + fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); + if (fh) + data->args.fh = fh; + return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient, + &filelayout_commit_call_ops, how); +} + +/* + * This is only useful while we are using whole file layouts. + */ +static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode) +{ + struct pnfs_layout_segment *lseg, *rv = NULL; + + spin_lock(&inode->i_lock); + list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) + if (lseg->pls_range.iomode == IOMODE_RW) + rv = get_lseg(lseg); + spin_unlock(&inode->i_lock); + return rv; +} + +static int alloc_ds_commits(struct inode *inode, struct list_head *list) +{ + struct pnfs_layout_segment *lseg; + struct nfs4_filelayout_segment *fl; + struct nfs_write_data *data; + int i, j; + + /* Won't need this when non-whole file layout segments are supported + * instead we will use a pnfs_layout_hdr structure */ + lseg = find_only_write_lseg(inode); + if (!lseg) + return 0; + fl = FILELAYOUT_LSEG(lseg); + for (i = 0; i < fl->number_of_buckets; i++) { + if (list_empty(&fl->commit_buckets[i])) + continue; + data = nfs_commitdata_alloc(); + if (!data) + goto out_bad; + data->ds_commit_index = i; + data->lseg = lseg; + list_add(&data->pages, list); + } + put_lseg(lseg); + return 0; + +out_bad: + for (j = i; j < fl->number_of_buckets; j++) { + if (list_empty(&fl->commit_buckets[i])) + continue; + nfs_retry_commit(&fl->commit_buckets[i], lseg); + put_lseg(lseg); /* associated with emptying bucket */ + } + put_lseg(lseg); + /* Caller will clean up entries put on list */ + return -ENOMEM; +} + +/* This follows nfs_commit_list pretty closely */ +static int +filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, + int how) +{ + struct nfs_write_data *data, *tmp; + LIST_HEAD(list); + + if (!list_empty(mds_pages)) { + data = nfs_commitdata_alloc(); + if (!data) + goto out_bad; + data->lseg = NULL; + list_add(&data->pages, &list); + } + + if (alloc_ds_commits(inode, &list)) + goto out_bad; + + list_for_each_entry_safe(data, tmp, &list, pages) { + list_del_init(&data->pages); + atomic_inc(&NFS_I(inode)->commits_outstanding); + if (!data->lseg) { + nfs_init_commit(data, mds_pages, NULL); + nfs_initiate_commit(data, NFS_CLIENT(inode), + data->mds_ops, how); + } else { + nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg); + filelayout_initiate_commit(data, how); + } + } + return 0; + out_bad: + list_for_each_entry_safe(data, tmp, &list, pages) { + nfs_retry_commit(&data->pages, data->lseg); + list_del_init(&data->pages); + nfs_commit_free(data); + } + nfs_retry_commit(mds_pages, NULL); + nfs_commit_clear_lock(NFS_I(inode)); + return -ENOMEM; +} + static struct pnfs_layoutdriver_type filelayout_type = { .id = LAYOUT_NFSV4_1_FILES, .name = "LAYOUT_NFSV4_1_FILES", @@ -581,6 +813,9 @@ static struct pnfs_layoutdriver_type filelayout_type = { .alloc_lseg = filelayout_alloc_lseg, .free_lseg = filelayout_free_lseg, .pg_test = filelayout_pg_test, + .mark_pnfs_commit = filelayout_mark_pnfs_commit, + .choose_commit_list = filelayout_choose_commit_list, + .commit_pagelist = filelayout_commit_pagelist, .read_pagelist = filelayout_read_pagelist, .write_pagelist = filelayout_write_pagelist, }; -- cgit v1.2.3