On Wed, 2022-08-31 at 20:48 -0400, Dave Wysochanski wrote: > Convert the NFS buffered read code paths to corresponding netfs APIs, > but only when fscache is configured and enabled. > > The netfs API defines struct netfs_request_ops which must be filled > in by the network filesystem. For NFS, we only need to define 5 of > the functions, the main one being the issue_read() function. > The issue_read() function is called by the netfs layer when a read > cannot be fulfilled locally, and must be sent to the server (either > the cache is not active, or it is active but the data is not available). > Once the read from the server is complete, netfs requires a call to > netfs_subreq_terminated() which conveys either how many bytes were read > successfully, or an error. Note that issue_read() is called with a > structure, netfs_io_subrequest, which defines the IO requested, and > contains a start and a length (both in bytes), and assumes the underlying > netfs will return a either an error on the whole region, or the number > of bytes successfully read. > > The NFS IO path is page based and the main APIs are the pgio APIs defined > in pagelist.c. For the pgio APIs, there is no way for the caller to > know how many RPCs will be sent and how the pages will be broken up > into underlying RPCs, each of which will have their own return code. > Thus, NFS needs some way to accommodate the netfs API requirement on > the single response to the whole request, while also minimizing > disruptive changes to the NFS pgio layer. The approach taken with this > patch is to allocate a small structure for each call to nfs_issue_read() > to keep some accounting information for the outstanding RPCs, as well as > the final error value or the number of bytes successfully read. The > accounting data is updated inside nfs_netfs_read_initiate(), and > nfs_netfs_read_done(), when a nfs_pgio_header contains a valid pointer > to the data. Then finally in nfs_read_completion(), call into > nfs_netfs_read_completion() to update the final error value and bytes > read, and check the accounting data to determine whether this is the > final RPC completion. If this is the last RPC, then call into > netfs_subreq_terminated() with the final error value or the number > of bytes transferred. > > Link: https://lore.kernel.org/linux-nfs/9cfd5bc3cfc6abc2d3316b0387222e708d67f595.camel@xxxxxxxxxxxxxxx/ > > Signed-off-by: Dave Wysochanski <dwysocha@xxxxxxxxxx> > --- > fs/nfs/fscache.c | 219 +++++++++++++++++++++++---------------- > fs/nfs/fscache.h | 71 +++++++------ > fs/nfs/inode.c | 3 + > fs/nfs/internal.h | 9 ++ > fs/nfs/pagelist.c | 14 +++ > fs/nfs/read.c | 68 ++++++++---- > include/linux/nfs_page.h | 3 + > include/linux/nfs_xdr.h | 3 + > 8 files changed, 245 insertions(+), 145 deletions(-) > > diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c > index a6fc1c8b6644..85f8251a608a 100644 > --- a/fs/nfs/fscache.c > +++ b/fs/nfs/fscache.c > @@ -15,6 +15,9 @@ > #include <linux/seq_file.h> > #include <linux/slab.h> > #include <linux/iversion.h> > +#include <linux/xarray.h> > +#include <linux/fscache.h> > +#include <linux/netfs.h> > > #include "internal.h" > #include "iostat.h" > @@ -235,112 +238,148 @@ void nfs_fscache_release_file(struct inode *inode, struct file *filp) > fscache_unuse_cookie(cookie, &auxdata, &i_size); > } > > -/* > - * Fallback page reading interface. > - */ > -static int fscache_fallback_read_page(struct inode *inode, struct page *page) > + > +atomic_t nfs_netfs_debug_id; > +static int nfs_netfs_init_request(struct netfs_io_request *rreq, struct file *file) > { > - struct netfs_cache_resources cres; > - struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs); > - struct iov_iter iter; > - struct bio_vec bvec[1]; > - int ret; > - > - memset(&cres, 0, sizeof(cres)); > - bvec[0].bv_page = page; > - bvec[0].bv_offset = 0; > - bvec[0].bv_len = PAGE_SIZE; > - iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE); > - > - ret = fscache_begin_read_operation(&cres, cookie); > - if (ret < 0) > - return ret; > - > - ret = fscache_read(&cres, page_offset(page), &iter, NETFS_READ_HOLE_FAIL, > - NULL, NULL); > - fscache_end_operation(&cres); > - return ret; > + rreq->netfs_priv = get_nfs_open_context(nfs_file_open_context(file)); > + > + if (netfs_i_cookie(&NFS_I(rreq->inode)->netfs)) > + rreq->debug_id = atomic_inc_return(&nfs_netfs_debug_id); > + > + return 0; > } > > -/* > - * Fallback page writing interface. > - */ > -static int fscache_fallback_write_page(struct inode *inode, struct page *page, > - bool no_space_allocated_yet) > +static void nfs_netfs_free_request(struct netfs_io_request *rreq) > { > - struct netfs_cache_resources cres; > - struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs); > - struct iov_iter iter; > - struct bio_vec bvec[1]; > - loff_t start = page_offset(page); > - size_t len = PAGE_SIZE; > - int ret; > - > - memset(&cres, 0, sizeof(cres)); > - bvec[0].bv_page = page; > - bvec[0].bv_offset = 0; > - bvec[0].bv_len = PAGE_SIZE; > - iov_iter_bvec(&iter, WRITE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE); > - > - ret = fscache_begin_write_operation(&cres, cookie); > - if (ret < 0) > - return ret; > - > - ret = cres.ops->prepare_write(&cres, &start, &len, i_size_read(inode), > - no_space_allocated_yet); > - if (ret == 0) > - ret = fscache_write(&cres, page_offset(page), &iter, NULL, NULL); > - fscache_end_operation(&cres); > - return ret; > + put_nfs_open_context(rreq->netfs_priv); > } > > -/* > - * Retrieve a page from fscache > - */ > -int __nfs_fscache_read_page(struct inode *inode, struct page *page) > +static inline int nfs_netfs_begin_cache_operation(struct netfs_io_request *rreq) > { > - int ret; > + return fscache_begin_read_operation(&rreq->cache_resources, > + netfs_i_cookie(&NFS_I(rreq->inode)->netfs)); > +} > > - trace_nfs_fscache_read_page(inode, page); > - if (PageChecked(page)) { > - ClearPageChecked(page); > - ret = 1; > - goto out; > - } > +static struct nfs_netfs_io_data *nfs_netfs_alloc(struct netfs_io_subrequest *sreq) > +{ > + struct nfs_netfs_io_data *netfs; > + > + netfs = kzalloc(sizeof(*netfs), GFP_KERNEL_ACCOUNT); > + if (!netfs) > + return NULL; > + netfs->sreq = sreq; > + refcount_set(&netfs->refcount, 1); > + spin_lock_init(&netfs->lock); > + return netfs; > +} > > - ret = fscache_fallback_read_page(inode, page); > - if (ret < 0) { > - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL); > - SetPageChecked(page); > - goto out; > +static bool nfs_netfs_clamp_length(struct netfs_io_subrequest *sreq) > +{ > + size_t rsize = NFS_SB(sreq->rreq->inode->i_sb)->rsize; > + > + sreq->len = min(sreq->len, rsize); > + return true; > +} > + > +static void nfs_netfs_issue_read(struct netfs_io_subrequest *sreq) > +{ > + struct nfs_pageio_descriptor pgio; > + struct inode *inode = sreq->rreq->inode; > + struct nfs_open_context *ctx = sreq->rreq->netfs_priv; > + struct page *page; > + int err; > + pgoff_t start = (sreq->start + sreq->transferred) >> PAGE_SHIFT; > + pgoff_t last = ((sreq->start + sreq->len - > + sreq->transferred - 1) >> PAGE_SHIFT); > + XA_STATE(xas, &sreq->rreq->mapping->i_pages, start); > + > + nfs_pageio_init_read(&pgio, inode, false, > + &nfs_async_read_completion_ops); > + > + pgio.pg_netfs = nfs_netfs_alloc(sreq); /* used in completion */ > + if (!pgio.pg_netfs) > + return netfs_subreq_terminated(sreq, -ENOMEM, false); > + > + xas_lock(&xas); > + xas_for_each(&xas, page, last) { > + /* nfs_pageio_add_page() may schedule() due to pNFS layout and other RPCs */ > + xas_pause(&xas); > + xas_unlock(&xas); > + err = nfs_pageio_add_page(&pgio, ctx, page); > + if (err < 0) > + return netfs_subreq_terminated(sreq, err, false); > + xas_lock(&xas); > } > + xas_unlock(&xas); > + nfs_pageio_complete_read(&pgio); > + nfs_netfs_put(pgio.pg_netfs); > +} > > - /* Read completed synchronously */ > - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK); > - SetPageUptodate(page); > - ret = 0; > -out: > - trace_nfs_fscache_read_page_exit(inode, page, ret); > - return ret; > +void nfs_netfs_read_initiate(struct nfs_pgio_header *hdr) > +{ > + struct nfs_netfs_io_data *netfs = hdr->netfs; > + > + if (!netfs) > + return; > + > + spin_lock(&netfs->lock); > + atomic_inc(&netfs->rpcs); > + netfs->rpc_byte_count += hdr->args.count; > + spin_unlock(&netfs->lock); > } > > -/* > - * Store a newly fetched page in fscache. We can be certain there's no page > - * stored in the cache as yet otherwise we would've read it from there. > - */ > -void __nfs_fscache_write_page(struct inode *inode, struct page *page) > +void nfs_netfs_read_done(struct nfs_pgio_header *hdr) > { > - int ret; > + struct nfs_netfs_io_data *netfs = hdr->netfs; > > - trace_nfs_fscache_write_page(inode, page); > + if (!netfs) > + return; > + > + spin_lock(&netfs->lock); > + if (hdr->res.op_status) { > + /* > + * Retryable errors such as BAD_STATEID will be re-issued, > + * so reduce the bytes and the RPC counts. > + */ > + netfs->rpc_byte_count -= hdr->args.count; > + atomic_dec(&netfs->rpcs); > + } > + spin_unlock(&netfs->lock); > +} > + > +void nfs_netfs_read_completion(struct nfs_pgio_header *hdr) > +{ > + struct nfs_netfs_io_data *netfs = hdr->netfs; > + struct netfs_io_subrequest *sreq; > + > + if (!netfs) > + return; > > - ret = fscache_fallback_write_page(inode, page, true); > + sreq = netfs->sreq; > + if (test_bit(NFS_IOHDR_EOF, &hdr->flags)) > + __set_bit(NETFS_SREQ_CLEAR_TAIL, &sreq->flags); > > - if (ret != 0) { > - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL); > - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_UNCACHED); > - } else { > - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_WRITTEN_OK); > + spin_lock(&netfs->lock); > + if (hdr->error) > + netfs->error = hdr->error; > + else > + netfs->transferred += hdr->res.count; > + spin_unlock(&netfs->lock); > + > + /* Only the last RPC completion should call netfs_subreq_terminated() */ > + if (atomic_dec_and_test(&netfs->rpcs) && > + (netfs->rpc_byte_count >= sreq->len)) { I don't quite understand the point of the rpc_byte_count. I guess this starts out being a total of the requested bytes in the read, and we decrement the number of bytes in the replies. This should always be a value that is equal to or larger than the sreq->len. Why is it necessary to track that, instead of just the number of RPCs? > + netfs_subreq_terminated(sreq, netfs->error ?: netfs->transferred, false); > + nfs_netfs_put(netfs); > + hdr->netfs = NULL; > } > - trace_nfs_fscache_write_page_exit(inode, page, ret); > } > + > +const struct netfs_request_ops nfs_netfs_ops = { > + .init_request = nfs_netfs_init_request, > + .free_request = nfs_netfs_free_request, > + .begin_cache_operation = nfs_netfs_begin_cache_operation, > + .issue_read = nfs_netfs_issue_read, > + .clamp_length = nfs_netfs_clamp_length > +}; > diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h > index 38614ed8f951..c59a82a7d4a8 100644 > --- a/fs/nfs/fscache.h > +++ b/fs/nfs/fscache.h > @@ -34,6 +34,44 @@ struct nfs_fscache_inode_auxdata { > u64 change_attr; > }; > > +struct nfs_netfs_io_data { > + refcount_t refcount; > + struct netfs_io_subrequest *sreq; > + > + /* > + * NFS may split a netfs_io_subrequest into multiple RPCs, each > + * with their own read completion. In netfs, we can only call > + * netfs_subreq_terminated() once for each subrequest. So we > + * must keep track of the rpcs and rpc_byte_count for what has > + * been submitted, and only call netfs via netfs_subreq_terminated() > + * when the final RPC has completed. > + */ > + atomic_t rpcs; > + unsigned long rpc_byte_count; > + > + /* > + * Final dispostion of the netfs_io_subrequest, sent in > + * netfs_subreq_terminated() > + */ > + spinlock_t lock; > + ssize_t transferred; > + int error; > +}; > + > +static inline void nfs_netfs_get(struct nfs_netfs_io_data *netfs) > +{ > + refcount_inc(&netfs->refcount); > +} > + > +static inline void nfs_netfs_put(struct nfs_netfs_io_data *netfs) > +{ > + if (refcount_dec_and_test(&netfs->refcount)) > + kfree(netfs); > +} > +extern void nfs_netfs_read_initiate(struct nfs_pgio_header *hdr); > +extern void nfs_netfs_read_done(struct nfs_pgio_header *hdr); > +extern void nfs_netfs_read_completion(struct nfs_pgio_header *hdr); > + > /* > * fscache.c > */ > @@ -45,43 +83,17 @@ extern void nfs_fscache_clear_inode(struct inode *); > extern void nfs_fscache_open_file(struct inode *, struct file *); > extern void nfs_fscache_release_file(struct inode *, struct file *); > > -extern int __nfs_fscache_read_page(struct inode *, struct page *); > -extern void __nfs_fscache_write_page(struct inode *, struct page *); > - > static inline bool nfs_fscache_release_folio(struct folio *folio, gfp_t gfp) > { > if (folio_test_fscache(folio)) { > if (current_is_kswapd() || !(gfp & __GFP_FS)) > return false; > folio_wait_fscache(folio); > - fscache_note_page_release(netfs_i_cookie(&NFS_I(folio->mapping->host)->netfs)); > - nfs_inc_fscache_stats(folio->mapping->host, > - NFSIOS_FSCACHE_PAGES_UNCACHED); > } > + fscache_note_page_release(netfs_i_cookie(&NFS_I(folio->mapping->host)->netfs)); > return true; > } > > -/* > - * Retrieve a page from an inode data storage object. > - */ > -static inline int nfs_fscache_read_page(struct inode *inode, struct page *page) > -{ > - if (netfs_inode(inode)->cache) > - return __nfs_fscache_read_page(inode, page); > - return -ENOBUFS; > -} > - > -/* > - * Store a page newly fetched from the server in an inode data storage object > - * in the cache. > - */ > -static inline void nfs_fscache_write_page(struct inode *inode, > - struct page *page) > -{ > - if (netfs_inode(inode)->cache) > - __nfs_fscache_write_page(inode, page); > -} > - > static inline void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *auxdata, > struct inode *inode) > { > @@ -130,11 +142,6 @@ static inline bool nfs_fscache_release_folio(struct folio *folio, gfp_t gfp) > { > return true; /* may release folio */ > } > -static inline int nfs_fscache_read_page(struct inode *inode, struct page *page) > -{ > - return -ENOBUFS; > -} > -static inline void nfs_fscache_write_page(struct inode *inode, struct page *page) {} > static inline void nfs_fscache_invalidate(struct inode *inode, int flags) {} > > static inline const char *nfs_server_fscache_state(struct nfs_server *server) > diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c > index aa2aec785ab5..a0af3518d8db 100644 > --- a/fs/nfs/inode.c > +++ b/fs/nfs/inode.c > @@ -2248,6 +2248,9 @@ struct inode *nfs_alloc_inode(struct super_block *sb) > #endif /* CONFIG_NFS_V4 */ > #ifdef CONFIG_NFS_V4_2 > nfsi->xattr_cache = NULL; > +#endif > +#ifdef CONFIG_NFS_FSCACHE > + netfs_inode_init(&nfsi->netfs, &nfs_netfs_ops); > #endif > return VFS_I(nfsi); > } > diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h > index 273687082992..e5589036c1f8 100644 > --- a/fs/nfs/internal.h > +++ b/fs/nfs/internal.h > @@ -453,6 +453,10 @@ extern void nfs_sb_deactive(struct super_block *sb); > extern int nfs_client_for_each_server(struct nfs_client *clp, > int (*fn)(struct nfs_server *, void *), > void *data); > +#ifdef CONFIG_NFS_FSCACHE > +extern const struct netfs_request_ops nfs_netfs_ops; > +#endif > + > /* io.c */ > extern void nfs_start_io_read(struct inode *inode); > extern void nfs_end_io_read(struct inode *inode); > @@ -482,9 +486,14 @@ extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool > > struct nfs_pgio_completion_ops; > /* read.c */ > +extern const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; > extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, > struct inode *inode, bool force_mds, > const struct nfs_pgio_completion_ops *compl_ops); > +extern int nfs_pageio_add_page(struct nfs_pageio_descriptor *pgio, > + struct nfs_open_context *ctx, > + struct page *page); > +extern void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio); > extern void nfs_read_prepare(struct rpc_task *task, void *calldata); > extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); > > diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c > index 317cedfa52bf..600989332a6f 100644 > --- a/fs/nfs/pagelist.c > +++ b/fs/nfs/pagelist.c > @@ -25,6 +25,7 @@ > #include "internal.h" > #include "pnfs.h" > #include "nfstrace.h" > +#include "fscache.h" > > #define NFSDBG_FACILITY NFSDBG_PAGECACHE > > @@ -68,6 +69,12 @@ void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, > hdr->good_bytes = mirror->pg_count; > hdr->io_completion = desc->pg_io_completion; > hdr->dreq = desc->pg_dreq; > +#ifdef CONFIG_NFS_FSCACHE > + if (desc->pg_netfs) { > + hdr->netfs = desc->pg_netfs; > + nfs_netfs_get(desc->pg_netfs); > + } > +#endif > hdr->release = release; > hdr->completion_ops = desc->pg_completion_ops; > if (hdr->completion_ops->init_hdr) > @@ -846,6 +853,9 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc, > desc->pg_lseg = NULL; > desc->pg_io_completion = NULL; > desc->pg_dreq = NULL; > +#ifdef CONFIG_NFS_FSCACHE > + desc->pg_netfs = NULL; > +#endif > desc->pg_bsize = bsize; > > desc->pg_mirror_count = 1; > @@ -940,6 +950,7 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, > /* Set up the argument struct */ > nfs_pgio_rpcsetup(hdr, mirror->pg_count, desc->pg_ioflags, &cinfo); > desc->pg_rpc_callops = &nfs_pgio_common_ops; > + > return 0; > } > EXPORT_SYMBOL_GPL(nfs_generic_pgio); > @@ -1360,6 +1371,9 @@ int nfs_pageio_resend(struct nfs_pageio_descriptor *desc, > > desc->pg_io_completion = hdr->io_completion; > desc->pg_dreq = hdr->dreq; > +#ifdef CONFIG_NFS_FSCACHE > + desc->pg_netfs = hdr->netfs; > +#endif > list_splice_init(&hdr->pages, &pages); > while (!list_empty(&pages)) { > struct nfs_page *req = nfs_list_entry(pages.next); > diff --git a/fs/nfs/read.c b/fs/nfs/read.c > index 525e82ea9a9e..3bc48472f207 100644 > --- a/fs/nfs/read.c > +++ b/fs/nfs/read.c > @@ -30,7 +30,7 @@ > > #define NFSDBG_FACILITY NFSDBG_PAGECACHE > > -static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; > +const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; > static const struct nfs_rw_ops nfs_rw_read_ops; > > static struct kmem_cache *nfs_rdata_cachep; > @@ -74,7 +74,7 @@ void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, > } > EXPORT_SYMBOL_GPL(nfs_pageio_init_read); > > -static void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio) > +void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio) > { > struct nfs_pgio_mirror *pgm; > unsigned long npages; > @@ -110,20 +110,25 @@ EXPORT_SYMBOL_GPL(nfs_pageio_reset_read_mds); > > static void nfs_readpage_release(struct nfs_page *req, int error) > { > - struct inode *inode = d_inode(nfs_req_openctx(req)->dentry); > struct page *page = req->wb_page; > > - dprintk("NFS: read done (%s/%llu %d@%lld)\n", inode->i_sb->s_id, > - (unsigned long long)NFS_FILEID(inode), req->wb_bytes, > - (long long)req_offset(req)); > - > if (nfs_error_is_fatal_on_server(error) && error != -ETIMEDOUT) > SetPageError(page); > if (nfs_page_group_sync_on_bit(req, PG_UNLOCKPAGE)) { > - if (PageUptodate(page)) > - nfs_fscache_write_page(inode, page); > +#ifdef CONFIG_NFS_FSCACHE > + struct inode *inode = d_inode(nfs_req_openctx(req)->dentry); > + > + /* > + * If fscache is enabled, netfs will unlock pages. > + * Otherwise, we have to unlock the page here > + */ > + if (!netfs_inode(inode)->cache) > + unlock_page(page); > +#else > unlock_page(page); > +#endif > } > + > nfs_release_request(req); > } > > @@ -177,6 +182,10 @@ static void nfs_read_completion(struct nfs_pgio_header *hdr) > nfs_list_remove_request(req); > nfs_readpage_release(req, error); > } > +#ifdef CONFIG_NFS_FSCACHE > + nfs_netfs_read_completion(hdr); > +#endif > + > out: > hdr->release(hdr); > } > @@ -187,6 +196,9 @@ static void nfs_initiate_read(struct nfs_pgio_header *hdr, > struct rpc_task_setup *task_setup_data, int how) > { > rpc_ops->read_setup(hdr, msg); > +#ifdef CONFIG_NFS_FSCACHE > + nfs_netfs_read_initiate(hdr); > +#endif > trace_nfs_initiate_read(hdr); > } > > @@ -202,7 +214,7 @@ nfs_async_read_error(struct list_head *head, int error) > } > } > > -static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = { > +const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = { > .error_cleanup = nfs_async_read_error, > .completion = nfs_read_completion, > }; > @@ -219,6 +231,9 @@ static int nfs_readpage_done(struct rpc_task *task, > if (status != 0) > return status; > > +#ifdef CONFIG_NFS_FSCACHE > + nfs_netfs_read_done(hdr); > +#endif > nfs_add_stats(inode, NFSIOS_SERVERREADBYTES, hdr->res.count); > trace_nfs_readpage_done(task, hdr); > > @@ -294,12 +309,6 @@ nfs_pageio_add_page(struct nfs_pageio_descriptor *pgio, > > aligned_len = min_t(unsigned int, ALIGN(len, rsize), PAGE_SIZE); > > - if (!IS_SYNC(page->mapping->host)) { > - error = nfs_fscache_read_page(page->mapping->host, page); > - if (error == 0) > - goto out_unlock; > - } > - > new = nfs_create_request(ctx, page, 0, aligned_len); > if (IS_ERR(new)) > goto out_error; > @@ -315,8 +324,6 @@ nfs_pageio_add_page(struct nfs_pageio_descriptor *pgio, > return 0; > out_error: > error = PTR_ERR(new); > -out_unlock: > - unlock_page(page); > out: > return error; > } > @@ -355,6 +362,12 @@ int nfs_read_folio(struct file *file, struct folio *folio) > if (NFS_STALE(inode)) > goto out_unlock; > > +#ifdef CONFIG_NFS_FSCACHE > + if (netfs_inode(inode)->cache) { > + ret = netfs_read_folio(file, folio); > + goto out; > + } > +#endif > if (file == NULL) { > ret = -EBADF; > ctx = nfs_find_open_context(inode, NULL, FMODE_READ); > @@ -368,8 +381,10 @@ int nfs_read_folio(struct file *file, struct folio *folio) > &nfs_async_read_completion_ops); > > ret = nfs_pageio_add_page(&pgio, ctx, page); > - if (ret) > - goto out; > + if (ret) { > + put_nfs_open_context(ctx); > + goto out_unlock; > + } > > nfs_pageio_complete_read(&pgio); > ret = pgio.pg_error < 0 ? pgio.pg_error : 0; > @@ -378,12 +393,12 @@ int nfs_read_folio(struct file *file, struct folio *folio) > if (!PageUptodate(page) && !ret) > ret = xchg(&ctx->error, 0); > } > -out: > put_nfs_open_context(ctx); > - trace_nfs_aop_readpage_done(inode, page, ret); > - return ret; > + goto out; > + > out_unlock: > unlock_page(page); > +out: > trace_nfs_aop_readpage_done(inode, page, ret); > return ret; > } > @@ -405,6 +420,13 @@ void nfs_readahead(struct readahead_control *ractl) > if (NFS_STALE(inode)) > goto out; > > +#ifdef CONFIG_NFS_FSCACHE > + if (netfs_inode(inode)->cache) { > + netfs_readahead(ractl); > + ret = 0; > + goto out; > + } > +#endif > if (file == NULL) { > ret = -EBADF; > ctx = nfs_find_open_context(inode, NULL, FMODE_READ); > diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h > index ba7e2e4b0926..8eeb16d9bacd 100644 > --- a/include/linux/nfs_page.h > +++ b/include/linux/nfs_page.h > @@ -101,6 +101,9 @@ struct nfs_pageio_descriptor { > struct pnfs_layout_segment *pg_lseg; > struct nfs_io_completion *pg_io_completion; > struct nfs_direct_req *pg_dreq; > +#ifdef CONFIG_NFS_FSCACHE > + void *pg_netfs; > +#endif > unsigned int pg_bsize; /* default bsize for mirrors */ > > u32 pg_mirror_count; > diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h > index e86cf6642d21..e196ef595908 100644 > --- a/include/linux/nfs_xdr.h > +++ b/include/linux/nfs_xdr.h > @@ -1619,6 +1619,9 @@ struct nfs_pgio_header { > const struct nfs_rw_ops *rw_ops; > struct nfs_io_completion *io_completion; > struct nfs_direct_req *dreq; > +#ifdef CONFIG_NFS_FSCACHE > + void *netfs; > +#endif > > int pnfs_error; > int error; /* merge with pnfs_error */ -- Jeff Layton <jlayton@xxxxxxxxxx>
