From: Fred Isaman Date: Fri, 20 Apr 2012 18:47:38 +0000 (-0400) Subject: NFS4.1: Add lseg to struct nfs4_fl_commit_bucket X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=799ba8d53d32c84bd2a867ca2689538a48176140;p=linux-beck.git NFS4.1: Add lseg to struct nfs4_fl_commit_bucket Also create a commit_info structure to hold the bucket array and push it up from the lseg to the layout where it really belongs. While we are at it, fix a refcounting bug due to an (incorrect) implicit assumption that filelayout_scan_ds_commit_list always completely emptied the src list. This clarifies refcounting, removes the ugly find_only_write_lseg functions, and pushes the file layout commit code along on the path to supporting multiple lsegs. Signed-off-by: Fred Isaman Signed-off-by: Trond Myklebust --- diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c index 5acfd9ea8a31..15aeba20d57d 100644 --- a/fs/nfs/nfs4filelayout.c +++ b/fs/nfs/nfs4filelayout.c @@ -650,10 +650,66 @@ filelayout_free_lseg(struct pnfs_layout_segment *lseg) dprintk("--> %s\n", __func__); nfs4_fl_put_deviceid(fl->dsaddr); - kfree(fl->commit_buckets); + /* This assumes a single RW lseg */ + if (lseg->pls_range.iomode == IOMODE_RW) { + struct nfs4_filelayout *flo; + + flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); + flo->commit_info.nbuckets = 0; + kfree(flo->commit_info.buckets); + flo->commit_info.buckets = NULL; + } _filelayout_free_lseg(fl); } +static int +filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg, + gfp_t gfp_flags) +{ + struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); + struct nfs4_filelayout *flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); + + struct nfs4_fl_commit_bucket *buckets; + int size; + + if (fl->commit_through_mds) + return 0; + if (flo->commit_info.nbuckets != 0) { + /* This assumes there is only one IOMODE_RW lseg. What + * we really want to do is have a layout_hdr level + * dictionary of keys, each + * associated with a struct list_head, populated by calls + * to filelayout_write_pagelist(). + * */ + return 0; + } + + size = (fl->stripe_type == STRIPE_SPARSE) ? + fl->dsaddr->ds_num : fl->dsaddr->stripe_count; + + buckets = kcalloc(size, sizeof(struct nfs4_fl_commit_bucket), + gfp_flags); + if (!buckets) + return -ENOMEM; + else { + int i; + + spin_lock(&lseg->pls_layout->plh_inode->i_lock); + if (flo->commit_info.nbuckets != 0) + kfree(buckets); + else { + flo->commit_info.buckets = buckets; + flo->commit_info.nbuckets = size; + for (i = 0; i < size; i++) { + INIT_LIST_HEAD(&buckets[i].written); + INIT_LIST_HEAD(&buckets[i].committing); + } + } + spin_unlock(&lseg->pls_layout->plh_inode->i_lock); + return 0; + } +} + static struct pnfs_layout_segment * filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, @@ -673,29 +729,6 @@ filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, _filelayout_free_lseg(fl); return NULL; } - - /* This assumes there is only one IOMODE_RW lseg. What - * we really want to do is have a layout_hdr level - * dictionary of keys, each - * associated with a struct list_head, populated by calls - * to filelayout_write_pagelist(). - * */ - if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) { - int i; - int size = (fl->stripe_type == STRIPE_SPARSE) ? - fl->dsaddr->ds_num : fl->dsaddr->stripe_count; - - fl->commit_buckets = kcalloc(size, sizeof(struct nfs4_fl_commit_bucket), gfp_flags); - if (!fl->commit_buckets) { - filelayout_free_lseg(&fl->generic_hdr); - return NULL; - } - fl->number_of_buckets = size; - for (i = 0; i < size; i++) { - INIT_LIST_HEAD(&fl->commit_buckets[i].written); - INIT_LIST_HEAD(&fl->commit_buckets[i].committing); - } - } return &fl->generic_hdr; } @@ -747,6 +780,8 @@ static void filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) { + int status; + BUG_ON(pgio->pg_lseg != NULL); pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, @@ -757,7 +792,16 @@ filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, GFP_NOFS); /* If no lseg, fall back to write through mds */ if (pgio->pg_lseg == NULL) - nfs_pageio_reset_write_mds(pgio); + goto out_mds; + status = filelayout_alloc_commit_info(pgio->pg_lseg, GFP_NOFS); + if (status < 0) { + put_lseg(pgio->pg_lseg); + pgio->pg_lseg = NULL; + goto out_mds; + } + return; +out_mds: + nfs_pageio_reset_write_mds(pgio); } static const struct nfs_pageio_ops filelayout_pg_read_ops = { @@ -793,17 +837,13 @@ filelayout_clear_request_commit(struct nfs_page *req) if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags)) goto out; if (list_is_singular(&req->wb_list)) { - struct pnfs_layout_segment *lseg; + struct nfs4_fl_commit_bucket *bucket; - /* From here we can find the bucket, but for the moment, - * since there is only one relevant lseg... - */ - list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { - if (lseg->pls_range.iomode == IOMODE_RW) { - freeme = lseg; - break; - } - } + bucket = list_first_entry(&req->wb_list, + struct nfs4_fl_commit_bucket, + written); + freeme = bucket->wlseg; + bucket->wlseg = NULL; } out: nfs_request_remove_commit_list(req); @@ -818,6 +858,7 @@ filelayout_choose_commit_list(struct nfs_page *req, struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); u32 i, j; struct list_head *list; + struct nfs4_fl_commit_bucket *buckets; if (fl->commit_through_mds) return &NFS_I(req->wb_context->dentry->d_inode)->commit_list; @@ -831,15 +872,16 @@ filelayout_choose_commit_list(struct nfs_page *req, 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].written; + buckets = FILELAYOUT_FROM_HDR(lseg->pls_layout)->commit_info.buckets; + list = &buckets[i].written; if (list_empty(list)) { /* Non-empty buckets hold a reference on the lseg. That ref * is normally transferred to the COMMIT call and released * there. It could also be released if the last req is pulled * off due to a rewrite, in which case it will be done in - * filelayout_remove_commit_req + * filelayout_clear_request_commit */ - get_lseg(lseg); + buckets[i].wlseg = get_lseg(lseg); } set_bit(PG_COMMIT_TO_DS, &req->wb_flags); return list; @@ -908,32 +950,6 @@ static int filelayout_initiate_commit(struct nfs_write_data *data, int how) &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_locked(struct inode *inode) -{ - struct pnfs_layout_segment *lseg; - - list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) - if (lseg->pls_range.iomode == IOMODE_RW) - return lseg; - return NULL; -} - -static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode) -{ - struct pnfs_layout_segment *rv; - - spin_lock(&inode->i_lock); - rv = find_only_write_lseg_locked(inode); - if (rv) - get_lseg(rv); - spin_unlock(&inode->i_lock); - return rv; -} - static int filelayout_scan_ds_commit_list(struct nfs4_fl_commit_bucket *bucket, int max, spinlock_t *lock) @@ -955,6 +971,13 @@ filelayout_scan_ds_commit_list(struct nfs4_fl_commit_bucket *bucket, int max, if (ret == max) break; } + if (ret) { + bucket->clseg = bucket->wlseg; + if (list_empty(src)) + bucket->wlseg = NULL; + else + get_lseg(bucket->clseg); + } return ret; } @@ -964,18 +987,14 @@ filelayout_scan_ds_commit_list(struct nfs4_fl_commit_bucket *bucket, int max, static int filelayout_scan_commit_lists(struct inode *inode, int max, spinlock_t *lock) { - struct pnfs_layout_segment *lseg; - struct nfs4_filelayout_segment *fl; + struct nfs4_fl_commit_info *fl_cinfo; int i, rv = 0, cnt; - lseg = find_only_write_lseg_locked(inode); - if (!lseg) - goto out_done; - fl = FILELAYOUT_LSEG(lseg); - if (fl->commit_through_mds) + fl_cinfo = &FILELAYOUT_FROM_HDR(NFS_I(inode)->layout)->commit_info; + if (fl_cinfo->nbuckets == 0) goto out_done; - for (i = 0; i < fl->number_of_buckets && max != 0; i++) { - cnt = filelayout_scan_ds_commit_list(&fl->commit_buckets[i], + for (i = 0; i < fl_cinfo->nbuckets && max != 0; i++) { + cnt = filelayout_scan_ds_commit_list(&fl_cinfo->buckets[i], max, lock); max -= cnt; rv += cnt; @@ -987,38 +1006,35 @@ out_done: static unsigned int alloc_ds_commits(struct inode *inode, struct list_head *list) { - struct pnfs_layout_segment *lseg; - struct nfs4_filelayout_segment *fl; + struct nfs4_fl_commit_info *fl_cinfo; + struct nfs4_fl_commit_bucket *bucket; struct nfs_write_data *data; int i, j; unsigned int nreq = 0; - /* 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].committing)) + fl_cinfo = &FILELAYOUT_FROM_HDR(NFS_I(inode)->layout)->commit_info; + bucket = fl_cinfo->buckets; + for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { + if (list_empty(&bucket->committing)) continue; data = nfs_commitdata_alloc(); if (!data) break; data->ds_commit_index = i; - data->lseg = lseg; + data->lseg = bucket->clseg; + bucket->clseg = NULL; list_add(&data->pages, list); nreq++; } /* Clean up on error */ - for (j = i; j < fl->number_of_buckets; j++) { - if (list_empty(&fl->commit_buckets[i].committing)) + for (j = i; j < fl_cinfo->nbuckets; j++, bucket++) { + if (list_empty(&bucket->committing)) continue; - nfs_retry_commit(&fl->commit_buckets[i].committing, lseg); - put_lseg(lseg); /* associated with emptying bucket */ + nfs_retry_commit(&bucket->committing, bucket->clseg); + put_lseg(bucket->clseg); + bucket->clseg = NULL; } - put_lseg(lseg); /* Caller will clean up entries put on list */ return nreq; } @@ -1058,7 +1074,10 @@ filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 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].committing, data->lseg); + struct nfs4_fl_commit_info *fl_cinfo; + + fl_cinfo = &FILELAYOUT_FROM_HDR(data->lseg->pls_layout)->commit_info; + nfs_init_commit(data, &fl_cinfo->buckets[data->ds_commit_index].committing, data->lseg); filelayout_initiate_commit(data, how); } } @@ -1072,10 +1091,27 @@ filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d) nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); } +static struct pnfs_layout_hdr * +filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) +{ + struct nfs4_filelayout *flo; + + flo = kzalloc(sizeof(*flo), gfp_flags); + return &flo->generic_hdr; +} + +static void +filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) +{ + kfree(FILELAYOUT_FROM_HDR(lo)); +} + static struct pnfs_layoutdriver_type filelayout_type = { .id = LAYOUT_NFSV4_1_FILES, .name = "LAYOUT_NFSV4_1_FILES", .owner = THIS_MODULE, + .alloc_layout_hdr = filelayout_alloc_layout_hdr, + .free_layout_hdr = filelayout_free_layout_hdr, .alloc_lseg = filelayout_alloc_lseg, .free_lseg = filelayout_free_lseg, .pg_read_ops = &filelayout_pg_read_ops, diff --git a/fs/nfs/nfs4filelayout.h b/fs/nfs/nfs4filelayout.h index 21190bb1f5e3..333a3ac97606 100644 --- a/fs/nfs/nfs4filelayout.h +++ b/fs/nfs/nfs4filelayout.h @@ -77,6 +77,13 @@ struct nfs4_file_layout_dsaddr { struct nfs4_fl_commit_bucket { struct list_head written; struct list_head committing; + struct pnfs_layout_segment *wlseg; + struct pnfs_layout_segment *clseg; +}; + +struct nfs4_fl_commit_info { + int nbuckets; + struct nfs4_fl_commit_bucket *buckets; }; struct nfs4_filelayout_segment { @@ -89,10 +96,19 @@ struct nfs4_filelayout_segment { struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */ unsigned int num_fh; struct nfs_fh **fh_array; - struct nfs4_fl_commit_bucket *commit_buckets; /* Sort commits to ds */ - int number_of_buckets; }; +struct nfs4_filelayout { + struct pnfs_layout_hdr generic_hdr; + struct nfs4_fl_commit_info commit_info; +}; + +static inline struct nfs4_filelayout * +FILELAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo) +{ + return container_of(lo, struct nfs4_filelayout, generic_hdr); +} + static inline struct nfs4_filelayout_segment * FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg) {