X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=fs%2Fnfs%2Fwrite.c;h=5d44b8bd107093c72ac5d0aa50f23a20025ec609;hb=334d0dd8b660557608142f0f77abc6812b48f08b;hp=797558941745a7b7a27fe0a931086680dc03eb42;hpb=cfaae3ee4a0d00c6b22780057e958d625499e90c;p=cascardo%2Flinux.git diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 797558941745..5d44b8bd1070 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -38,7 +38,8 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context*, struct page *, unsigned int, unsigned int); -static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how); +static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, + struct inode *inode, int ioflags); static const struct rpc_call_ops nfs_write_partial_ops; static const struct rpc_call_ops nfs_write_full_ops; static const struct rpc_call_ops nfs_commit_ops; @@ -71,9 +72,8 @@ void nfs_commit_free(struct nfs_write_data *wdata) call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free); } -struct nfs_write_data *nfs_writedata_alloc(size_t len) +struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) { - unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); if (p) { @@ -139,7 +139,7 @@ static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int c { struct inode *inode = page->mapping->host; loff_t end, i_size = i_size_read(inode); - unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; + pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; if (i_size > 0 && page->index < end_index) return; @@ -201,7 +201,7 @@ static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, static int wb_priority(struct writeback_control *wbc) { if (wbc->for_reclaim) - return FLUSH_HIGHPRI; + return FLUSH_HIGHPRI | FLUSH_STABLE; if (wbc->for_kupdate) return FLUSH_LOWPRI; return 0; @@ -251,7 +251,8 @@ static void nfs_end_page_writeback(struct page *page) * was not tagged. * May also return an error if the user signalled nfs_wait_on_request(). */ -static int nfs_page_mark_flush(struct page *page) +static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, + struct page *page) { struct nfs_page *req; struct nfs_inode *nfsi = NFS_I(page->mapping->host); @@ -273,6 +274,8 @@ static int nfs_page_mark_flush(struct page *page) * request as dirty (in which case we don't care). */ spin_unlock(req_lock); + /* Prevent deadlock! */ + nfs_pageio_complete(pgio); ret = nfs_wait_on_request(req); nfs_release_request(req); if (ret != 0) @@ -283,21 +286,18 @@ static int nfs_page_mark_flush(struct page *page) /* This request is marked for commit */ spin_unlock(req_lock); nfs_unlock_request(req); + nfs_pageio_complete(pgio); return 1; } - if (nfs_set_page_writeback(page) == 0) { - nfs_list_remove_request(req); - /* add the request to the inode's dirty list. */ - radix_tree_tag_set(&nfsi->nfs_page_tree, - req->wb_index, NFS_PAGE_TAG_DIRTY); - nfs_list_add_request(req, &nfsi->dirty); - nfsi->ndirty++; - spin_unlock(req_lock); - __mark_inode_dirty(page->mapping->host, I_DIRTY_PAGES); - } else + if (nfs_set_page_writeback(page) != 0) { spin_unlock(req_lock); + BUG(); + } + radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, + NFS_PAGE_TAG_WRITEBACK); ret = test_bit(PG_NEED_FLUSH, &req->wb_flags); - nfs_unlock_request(req); + spin_unlock(req_lock); + nfs_pageio_add_request(pgio, req); return ret; } @@ -306,6 +306,7 @@ static int nfs_page_mark_flush(struct page *page) */ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) { + struct nfs_pageio_descriptor mypgio, *pgio; struct nfs_open_context *ctx; struct inode *inode = page->mapping->host; unsigned offset; @@ -314,7 +315,14 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); - err = nfs_page_mark_flush(page); + if (wbc->for_writepages) + pgio = wbc->fs_private; + else { + nfs_pageio_init_write(&mypgio, inode, wb_priority(wbc)); + pgio = &mypgio; + } + + err = nfs_page_async_flush(pgio, page); if (err <= 0) goto out; err = 0; @@ -331,12 +339,12 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc put_nfs_open_context(ctx); if (err != 0) goto out; - err = nfs_page_mark_flush(page); + err = nfs_page_async_flush(pgio, page); if (err > 0) err = 0; out: if (!wbc->for_writepages) - nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|wb_priority(wbc)); + nfs_pageio_complete(pgio); return err; } @@ -352,20 +360,20 @@ int nfs_writepage(struct page *page, struct writeback_control *wbc) int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) { struct inode *inode = mapping->host; + struct nfs_pageio_descriptor pgio; int err; nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); + nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); + wbc->fs_private = &pgio; err = generic_writepages(mapping, wbc); + nfs_pageio_complete(&pgio); if (err) return err; - err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc)); - if (err < 0) - goto out; - nfs_add_stats(inode, NFSIOS_WRITEPAGES, err); - err = 0; -out: - return err; + if (pgio.pg_error) + return pgio.pg_error; + return 0; } /* @@ -503,11 +511,11 @@ int nfs_reschedule_unstable_write(struct nfs_page *req) * * Interruptible by signals only if mounted with intr flag. */ -static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages) +static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) { struct nfs_inode *nfsi = NFS_I(inode); struct nfs_page *req; - unsigned long idx_end, next; + pgoff_t idx_end, next; unsigned int res = 0; int error; @@ -536,18 +544,6 @@ static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_st return res; } -static void nfs_cancel_dirty_list(struct list_head *head) -{ - struct nfs_page *req; - while(!list_empty(head)) { - req = nfs_list_entry(head->next); - nfs_list_remove_request(req); - nfs_end_page_writeback(req->wb_page); - nfs_inode_remove_request(req); - nfs_clear_page_writeback(req); - } -} - static void nfs_cancel_commit_list(struct list_head *head) { struct nfs_page *req; @@ -574,7 +570,7 @@ static void nfs_cancel_commit_list(struct list_head *head) * The requests are *not* checked to ensure that they form a contiguous set. */ static int -nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) +nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) { struct nfs_inode *nfsi = NFS_I(inode); int res = 0; @@ -588,40 +584,12 @@ nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_st return res; } #else -static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages) +static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) { return 0; } #endif -static int nfs_wait_on_write_congestion(struct address_space *mapping) -{ - struct inode *inode = mapping->host; - struct backing_dev_info *bdi = mapping->backing_dev_info; - int ret = 0; - - might_sleep(); - - if (!bdi_write_congested(bdi)) - return 0; - - nfs_inc_stats(inode, NFSIOS_CONGESTIONWAIT); - - do { - struct rpc_clnt *clnt = NFS_CLIENT(inode); - sigset_t oldset; - - rpc_clnt_sigmask(clnt, &oldset); - ret = congestion_wait_interruptible(WRITE, HZ/10); - rpc_clnt_sigunmask(clnt, &oldset); - if (ret == -ERESTARTSYS) - break; - ret = 0; - } while (bdi_write_congested(bdi)); - - return ret; -} - /* * Try to update any existing write request, or create one if there is none. * In order to match, the request's credentials must match those of @@ -636,12 +604,10 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx, struct inode *inode = mapping->host; struct nfs_inode *nfsi = NFS_I(inode); struct nfs_page *req, *new = NULL; - unsigned long rqend, end; + pgoff_t rqend, end; end = offset + bytes; - if (nfs_wait_on_write_congestion(mapping)) - return ERR_PTR(-ERESTARTSYS); for (;;) { /* Loop over all inode entries and see if we find * A request for the page we wish to update @@ -865,7 +831,7 @@ static void nfs_execute_write(struct nfs_write_data *data) * Generate multiple small requests to write out a single * contiguous dirty area on one page. */ -static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) +static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) { struct nfs_page *req = nfs_list_entry(head->next); struct page *page = req->wb_page; @@ -877,11 +843,11 @@ static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) nfs_list_remove_request(req); - nbytes = req->wb_bytes; + nbytes = count; do { size_t len = min(nbytes, wsize); - data = nfs_writedata_alloc(len); + data = nfs_writedata_alloc(1); if (!data) goto out_bad; list_add(&data->pages, &list); @@ -892,23 +858,19 @@ static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how) ClearPageError(page); offset = 0; - nbytes = req->wb_bytes; + nbytes = count; do { data = list_entry(list.next, struct nfs_write_data, pages); list_del_init(&data->pages); data->pagevec[0] = page; - if (nbytes > wsize) { - nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, - wsize, offset, how); - offset += wsize; - nbytes -= wsize; - } else { - nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, - nbytes, offset, how); - nbytes = 0; - } + if (nbytes < wsize) + wsize = nbytes; + nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, + wsize, offset, how); + offset += wsize; + nbytes -= wsize; nfs_execute_write(data); } while (nbytes != 0); @@ -934,26 +896,23 @@ out_bad: * This is the case if nfs_updatepage detects a conflicting request * that has been written but not committed. */ -static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) +static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) { struct nfs_page *req; struct page **pages; struct nfs_write_data *data; - unsigned int count; - data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize); + data = nfs_writedata_alloc(npages); if (!data) goto out_bad; pages = data->pagevec; - count = 0; while (!list_empty(head)) { req = nfs_list_entry(head->next); nfs_list_remove_request(req); nfs_list_add_request(req, &data->pages); ClearPageError(req->wb_page); *pages++ = req->wb_page; - count += req->wb_bytes; } req = nfs_list_entry(data->pages.next); @@ -973,40 +932,15 @@ static int nfs_flush_one(struct inode *inode, struct list_head *head, int how) return -ENOMEM; } -static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how) +static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, + struct inode *inode, int ioflags) { - LIST_HEAD(one_request); - int (*flush_one)(struct inode *, struct list_head *, int); - struct nfs_page *req; - int wpages = NFS_SERVER(inode)->wpages; int wsize = NFS_SERVER(inode)->wsize; - int error; - flush_one = nfs_flush_one; if (wsize < PAGE_CACHE_SIZE) - flush_one = nfs_flush_multi; - /* For single writes, FLUSH_STABLE is more efficient */ - if (npages <= wpages && npages == NFS_I(inode)->npages - && nfs_list_entry(head->next)->wb_bytes <= wsize) - how |= FLUSH_STABLE; - - do { - nfs_coalesce_requests(head, &one_request, wpages); - req = nfs_list_entry(one_request.next); - error = flush_one(inode, &one_request, how); - if (error < 0) - goto out_err; - } while (!list_empty(head)); - return 0; -out_err: - while (!list_empty(head)) { - req = nfs_list_entry(head->next); - nfs_list_remove_request(req); - nfs_redirty_request(req); - nfs_end_page_writeback(req->wb_page); - nfs_clear_page_writeback(req); - } - return error; + nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); + else + nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); } /* @@ -1330,31 +1264,7 @@ static const struct rpc_call_ops nfs_commit_ops = { .rpc_call_done = nfs_commit_done, .rpc_release = nfs_commit_release, }; -#else -static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) -{ - return 0; -} -#endif - -static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) -{ - struct nfs_inode *nfsi = NFS_I(mapping->host); - LIST_HEAD(head); - long res; - - spin_lock(&nfsi->req_lock); - res = nfs_scan_dirty(mapping, wbc, &head); - spin_unlock(&nfsi->req_lock); - if (res) { - int error = nfs_flush_list(mapping->host, &head, res, how); - if (error < 0) - return error; - } - return res; -} -#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) int nfs_commit_inode(struct inode *inode, int how) { struct nfs_inode *nfsi = NFS_I(inode); @@ -1371,13 +1281,18 @@ int nfs_commit_inode(struct inode *inode, int how) } return res; } +#else +static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) +{ + return 0; +} #endif long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) { struct inode *inode = mapping->host; struct nfs_inode *nfsi = NFS_I(inode); - unsigned long idx_start, idx_end; + pgoff_t idx_start, idx_end; unsigned int npages = 0; LIST_HEAD(head); int nocommit = how & FLUSH_NOCOMMIT; @@ -1390,41 +1305,24 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; if (idx_end > idx_start) { - unsigned long l_npages = 1 + idx_end - idx_start; + pgoff_t l_npages = 1 + idx_end - idx_start; npages = l_npages; if (sizeof(npages) != sizeof(l_npages) && - (unsigned long)npages != l_npages) + (pgoff_t)npages != l_npages) npages = 0; } } how &= ~FLUSH_NOCOMMIT; spin_lock(&nfsi->req_lock); do { - wbc->pages_skipped = 0; ret = nfs_wait_on_requests_locked(inode, idx_start, npages); if (ret != 0) continue; - pages = nfs_scan_dirty(mapping, wbc, &head); - if (pages != 0) { - spin_unlock(&nfsi->req_lock); - if (how & FLUSH_INVALIDATE) { - nfs_cancel_dirty_list(&head); - ret = pages; - } else - ret = nfs_flush_list(inode, &head, pages, how); - spin_lock(&nfsi->req_lock); - continue; - } - if (wbc->pages_skipped != 0) - continue; if (nocommit) break; pages = nfs_scan_commit(inode, &head, idx_start, npages); - if (pages == 0) { - if (wbc->pages_skipped != 0) - continue; + if (pages == 0) break; - } if (how & FLUSH_INVALIDATE) { spin_unlock(&nfsi->req_lock); nfs_cancel_commit_list(&head); @@ -1456,7 +1354,7 @@ int nfs_wb_all(struct inode *inode) }; int ret; - ret = generic_writepages(mapping, &wbc); + ret = nfs_writepages(mapping, &wbc); if (ret < 0) goto out; ret = nfs_sync_mapping_wait(mapping, &wbc, 0); @@ -1479,11 +1377,9 @@ int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, lo }; int ret; - if (!(how & FLUSH_NOWRITEPAGE)) { - ret = generic_writepages(mapping, &wbc); - if (ret < 0) - goto out; - } + ret = nfs_writepages(mapping, &wbc); + if (ret < 0) + goto out; ret = nfs_sync_mapping_wait(mapping, &wbc, how); if (ret >= 0) return 0; @@ -1506,7 +1402,7 @@ int nfs_wb_page_priority(struct inode *inode, struct page *page, int how) int ret; BUG_ON(!PageLocked(page)); - if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) { + if (clear_page_dirty_for_io(page)) { ret = nfs_writepage_locked(page, &wbc); if (ret < 0) goto out; @@ -1531,10 +1427,18 @@ int nfs_wb_page(struct inode *inode, struct page* page) int nfs_set_page_dirty(struct page *page) { - spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock; + struct address_space *mapping = page->mapping; + struct inode *inode; + spinlock_t *req_lock; struct nfs_page *req; int ret; + if (!mapping) + goto out_raced; + inode = mapping->host; + if (!inode) + goto out_raced; + req_lock = &NFS_I(inode)->req_lock; spin_lock(req_lock); req = nfs_page_find_request_locked(page); if (req != NULL) { @@ -1547,6 +1451,8 @@ int nfs_set_page_dirty(struct page *page) ret = __set_page_dirty_nobuffers(page); spin_unlock(req_lock); return ret; +out_raced: + return !TestSetPageDirty(page); }