Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/read.c |
| 3 | * |
| 4 | * Block I/O for NFS |
| 5 | * |
| 6 | * Partial copy of Linus' read cache modifications to fs/nfs/file.c |
| 7 | * modified for async RPC by okir@monad.swb.de |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/time.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/fcntl.h> |
| 14 | #include <linux/stat.h> |
| 15 | #include <linux/mm.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/pagemap.h> |
| 18 | #include <linux/sunrpc/clnt.h> |
| 19 | #include <linux/nfs_fs.h> |
| 20 | #include <linux/nfs_page.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #include <asm/system.h> |
| 23 | |
Andy Adamson | f11c88a | 2009-04-01 09:22:25 -0400 | [diff] [blame] | 24 | #include "nfs4_fs.h" |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 25 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 26 | #include "iostat.h" |
David Howells | 9a9fc1c | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 27 | #include "fscache.h" |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 28 | #include "pnfs.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
| 31 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 32 | static int nfs_pagein_multi(struct inode *, struct list_head *, unsigned int, size_t, int); |
| 33 | static int nfs_pagein_one(struct inode *, struct list_head *, unsigned int, size_t, int); |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 34 | static const struct rpc_call_ops nfs_read_partial_ops; |
| 35 | static const struct rpc_call_ops nfs_read_full_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 37 | static struct kmem_cache *nfs_rdata_cachep; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 38 | static mempool_t *nfs_rdata_mempool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #define MIN_POOL_READ (32) |
| 41 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 42 | struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 43 | { |
Trond Myklebust | 93870d7 | 2010-05-13 12:51:03 -0400 | [diff] [blame] | 44 | struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, GFP_KERNEL); |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 45 | |
| 46 | if (p) { |
| 47 | memset(p, 0, sizeof(*p)); |
| 48 | INIT_LIST_HEAD(&p->pages); |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 49 | p->npages = pagecount; |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 50 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
| 51 | p->pagevec = p->page_array; |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 52 | else { |
Trond Myklebust | 93870d7 | 2010-05-13 12:51:03 -0400 | [diff] [blame] | 53 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL); |
Chuck Lever | 0d0b5cb | 2006-05-25 01:40:53 -0400 | [diff] [blame] | 54 | if (!p->pagevec) { |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 55 | mempool_free(p, nfs_rdata_mempool); |
| 56 | p = NULL; |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | return p; |
| 61 | } |
| 62 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 63 | void nfs_readdata_free(struct nfs_read_data *p) |
Trond Myklebust | 3feb2d4 | 2006-03-20 13:44:37 -0500 | [diff] [blame] | 64 | { |
| 65 | if (p && (p->pagevec != &p->page_array[0])) |
| 66 | kfree(p->pagevec); |
| 67 | mempool_free(p, nfs_rdata_mempool); |
| 68 | } |
| 69 | |
Trond Myklebust | 1ae88b2 | 2009-08-12 09:12:30 -0400 | [diff] [blame] | 70 | static void nfs_readdata_release(struct nfs_read_data *rdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | { |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 72 | put_nfs_open_context(rdata->args.context); |
| 73 | nfs_readdata_free(rdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | int nfs_return_empty_page(struct page *page) |
| 78 | { |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 79 | zero_user(page, 0, PAGE_CACHE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | SetPageUptodate(page); |
| 81 | unlock_page(page); |
| 82 | return 0; |
| 83 | } |
| 84 | |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 85 | static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data) |
| 86 | { |
| 87 | unsigned int remainder = data->args.count - data->res.count; |
| 88 | unsigned int base = data->args.pgbase + data->res.count; |
| 89 | unsigned int pglen; |
| 90 | struct page **pages; |
| 91 | |
| 92 | if (data->res.eof == 0 || remainder == 0) |
| 93 | return; |
| 94 | /* |
| 95 | * Note: "remainder" can never be negative, since we check for |
| 96 | * this in the XDR code. |
| 97 | */ |
| 98 | pages = &data->args.pages[base >> PAGE_CACHE_SHIFT]; |
| 99 | base &= ~PAGE_CACHE_MASK; |
| 100 | pglen = PAGE_CACHE_SIZE - base; |
Trond Myklebust | 79558f3 | 2006-08-22 13:44:32 -0400 | [diff] [blame] | 101 | for (;;) { |
| 102 | if (remainder <= pglen) { |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 103 | zero_user(*pages, base, remainder); |
Trond Myklebust | 79558f3 | 2006-08-22 13:44:32 -0400 | [diff] [blame] | 104 | break; |
| 105 | } |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 106 | zero_user(*pages, base, pglen); |
Trond Myklebust | 79558f3 | 2006-08-22 13:44:32 -0400 | [diff] [blame] | 107 | pages++; |
| 108 | remainder -= pglen; |
| 109 | pglen = PAGE_CACHE_SIZE; |
| 110 | base = 0; |
| 111 | } |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 112 | } |
| 113 | |
David Howells | f42b293 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 114 | int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode, |
| 115 | struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
| 117 | LIST_HEAD(one_request); |
| 118 | struct nfs_page *new; |
| 119 | unsigned int len; |
| 120 | |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 121 | len = nfs_page_length(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | if (len == 0) |
| 123 | return nfs_return_empty_page(page); |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 124 | pnfs_update_layout(inode, ctx, IOMODE_READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | new = nfs_create_request(ctx, inode, page, 0, len); |
| 126 | if (IS_ERR(new)) { |
| 127 | unlock_page(page); |
| 128 | return PTR_ERR(new); |
| 129 | } |
| 130 | if (len < PAGE_CACHE_SIZE) |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 131 | zero_user_segment(page, len, PAGE_CACHE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | nfs_list_add_request(new, &one_request); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 134 | if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE) |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 135 | nfs_pagein_multi(inode, &one_request, 1, len, 0); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 136 | else |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 137 | nfs_pagein_one(inode, &one_request, 1, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static void nfs_readpage_release(struct nfs_page *req) |
| 142 | { |
David Howells | 7f8e05f | 2009-04-03 16:42:45 +0100 | [diff] [blame] | 143 | struct inode *d_inode = req->wb_context->path.dentry->d_inode; |
| 144 | |
| 145 | if (PageUptodate(req->wb_page)) |
| 146 | nfs_readpage_to_fscache(d_inode, req->wb_page, 0); |
| 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | unlock_page(req->wb_page); |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | dprintk("NFS: read done (%s/%Ld %d@%Ld)\n", |
Trond Myklebust | 88be9f9 | 2007-06-05 10:42:27 -0400 | [diff] [blame] | 151 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
| 152 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | req->wb_bytes, |
| 154 | (long long)req_offset(req)); |
Nick Wilson | 10d2c46 | 2005-09-22 21:44:28 -0700 | [diff] [blame] | 155 | nfs_release_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Set up the NFS read request struct |
| 160 | */ |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 161 | static int nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data, |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 162 | const struct rpc_call_ops *call_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | unsigned int count, unsigned int offset) |
| 164 | { |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 165 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
| 166 | int swap_flags = IS_SWAPFILE(inode) ? NFS_RPC_SWAPFLAGS : 0; |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 167 | struct rpc_task *task; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 168 | struct rpc_message msg = { |
| 169 | .rpc_argp = &data->args, |
| 170 | .rpc_resp = &data->res, |
| 171 | .rpc_cred = req->wb_context->cred, |
| 172 | }; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 173 | struct rpc_task_setup task_setup_data = { |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 174 | .task = &data->task, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 175 | .rpc_client = NFS_CLIENT(inode), |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 176 | .rpc_message = &msg, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 177 | .callback_ops = call_ops, |
| 178 | .callback_data = data, |
Trond Myklebust | 101070c | 2008-02-19 20:04:23 -0500 | [diff] [blame] | 179 | .workqueue = nfsiod_workqueue, |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 180 | .flags = RPC_TASK_ASYNC | swap_flags, |
| 181 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | data->req = req; |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 184 | data->inode = inode; |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 185 | data->cred = msg.rpc_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
| 187 | data->args.fh = NFS_FH(inode); |
| 188 | data->args.offset = req_offset(req) + offset; |
| 189 | data->args.pgbase = req->wb_pgbase + offset; |
| 190 | data->args.pages = data->pagevec; |
| 191 | data->args.count = count; |
Trond Myklebust | 383ba71 | 2008-02-19 20:04:20 -0500 | [diff] [blame] | 192 | data->args.context = get_nfs_open_context(req->wb_context); |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 193 | data->args.lock_context = req->wb_lock_context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | data->res.fattr = &data->fattr; |
| 196 | data->res.count = count; |
| 197 | data->res.eof = 0; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 198 | nfs_fattr_init(&data->fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 200 | /* Set up the initial task struct. */ |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 201 | NFS_PROTO(inode)->read_setup(data, &msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Chuck Lever | a3f565b | 2007-01-31 12:14:01 -0500 | [diff] [blame] | 203 | dprintk("NFS: %5u initiated read call (req %s/%Ld, %u bytes @ offset %Lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | data->task.tk_pid, |
| 205 | inode->i_sb->s_id, |
| 206 | (long long)NFS_FILEID(inode), |
| 207 | count, |
| 208 | (unsigned long long)data->args.offset); |
Trond Myklebust | bdc7f02 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 209 | |
Trond Myklebust | 0773769 | 2007-10-25 18:42:54 -0400 | [diff] [blame] | 210 | task = rpc_run_task(&task_setup_data); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 211 | if (IS_ERR(task)) |
| 212 | return PTR_ERR(task); |
| 213 | rpc_put_task(task); |
| 214 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | static void |
| 218 | nfs_async_read_error(struct list_head *head) |
| 219 | { |
| 220 | struct nfs_page *req; |
| 221 | |
| 222 | while (!list_empty(head)) { |
| 223 | req = nfs_list_entry(head->next); |
| 224 | nfs_list_remove_request(req); |
| 225 | SetPageError(req->wb_page); |
| 226 | nfs_readpage_release(req); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | * Generate multiple requests to fill a single page. |
| 232 | * |
| 233 | * We optimize to reduce the number of read operations on the wire. If we |
| 234 | * detect that we're reading a page, or an area of a page, that is past the |
| 235 | * end of file, we do not generate NFS read operations but just clear the |
| 236 | * parts of the page that would have come back zero from the server anyway. |
| 237 | * |
| 238 | * We rely on the cached value of i_size to make this determination; another |
| 239 | * client can fill pages on the server past our cached end-of-file, but we |
| 240 | * won't see the new data until our attribute cache is updated. This is more |
| 241 | * or less conventional NFS client behavior. |
| 242 | */ |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 243 | static int nfs_pagein_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | { |
| 245 | struct nfs_page *req = nfs_list_entry(head->next); |
| 246 | struct page *page = req->wb_page; |
| 247 | struct nfs_read_data *data; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 248 | size_t rsize = NFS_SERVER(inode)->rsize, nbytes; |
| 249 | unsigned int offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | int requests = 0; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 251 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | LIST_HEAD(list); |
| 253 | |
| 254 | nfs_list_remove_request(req); |
| 255 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 256 | nbytes = count; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 257 | do { |
| 258 | size_t len = min(nbytes,rsize); |
| 259 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 260 | data = nfs_readdata_alloc(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (!data) |
| 262 | goto out_bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | list_add(&data->pages, &list); |
| 264 | requests++; |
Trond Myklebust | e9f7bee | 2006-09-08 09:48:54 -0700 | [diff] [blame] | 265 | nbytes -= len; |
| 266 | } while(nbytes != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | atomic_set(&req->wb_complete, requests); |
| 268 | |
| 269 | ClearPageError(page); |
| 270 | offset = 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 271 | nbytes = count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | do { |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 273 | int ret2; |
| 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | data = list_entry(list.next, struct nfs_read_data, pages); |
| 276 | list_del_init(&data->pages); |
| 277 | |
| 278 | data->pagevec[0] = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 280 | if (nbytes < rsize) |
| 281 | rsize = nbytes; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 282 | ret2 = nfs_read_rpcsetup(req, data, &nfs_read_partial_ops, |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 283 | rsize, offset); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 284 | if (ret == 0) |
| 285 | ret = ret2; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 286 | offset += rsize; |
| 287 | nbytes -= rsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } while (nbytes != 0); |
| 289 | |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 290 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | out_bad: |
| 293 | while (!list_empty(&list)) { |
| 294 | data = list_entry(list.next, struct nfs_read_data, pages); |
| 295 | list_del(&data->pages); |
| 296 | nfs_readdata_free(data); |
| 297 | } |
| 298 | SetPageError(page); |
| 299 | nfs_readpage_release(req); |
| 300 | return -ENOMEM; |
| 301 | } |
| 302 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 303 | static int nfs_pagein_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
| 305 | struct nfs_page *req; |
| 306 | struct page **pages; |
| 307 | struct nfs_read_data *data; |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 308 | int ret = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 310 | data = nfs_readdata_alloc(npages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | if (!data) |
| 312 | goto out_bad; |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | pages = data->pagevec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | while (!list_empty(head)) { |
| 316 | req = nfs_list_entry(head->next); |
| 317 | nfs_list_remove_request(req); |
| 318 | nfs_list_add_request(req, &data->pages); |
| 319 | ClearPageError(req->wb_page); |
| 320 | *pages++ = req->wb_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | req = nfs_list_entry(data->pages.next); |
| 323 | |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 324 | return nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | out_bad: |
| 326 | nfs_async_read_error(head); |
Trond Myklebust | dbae4c7 | 2008-04-14 14:54:53 -0400 | [diff] [blame] | 327 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | } |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 331 | * This is the callback from RPC telling us whether a reply was |
| 332 | * received or some error occurred (timeout or socket shutdown). |
| 333 | */ |
| 334 | int nfs_readpage_result(struct rpc_task *task, struct nfs_read_data *data) |
| 335 | { |
| 336 | int status; |
| 337 | |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 338 | dprintk("NFS: %s: %5u, (status %d)\n", __func__, task->tk_pid, |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 339 | task->tk_status); |
| 340 | |
| 341 | status = NFS_PROTO(data->inode)->read_done(task, data); |
| 342 | if (status != 0) |
| 343 | return status; |
| 344 | |
| 345 | nfs_add_stats(data->inode, NFSIOS_SERVERREADBYTES, data->res.count); |
| 346 | |
| 347 | if (task->tk_status == -ESTALE) { |
Benny Halevy | 3a10c30 | 2008-01-23 08:58:59 +0200 | [diff] [blame] | 348 | set_bit(NFS_INO_STALE, &NFS_I(data->inode)->flags); |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 349 | nfs_mark_for_revalidate(data->inode); |
| 350 | } |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 351 | return 0; |
| 352 | } |
| 353 | |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 354 | static void nfs_readpage_retry(struct rpc_task *task, struct nfs_read_data *data) |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 355 | { |
| 356 | struct nfs_readargs *argp = &data->args; |
| 357 | struct nfs_readres *resp = &data->res; |
| 358 | |
| 359 | if (resp->eof || resp->count == argp->count) |
Trond Myklebust | d61e612 | 2009-12-05 19:32:19 -0500 | [diff] [blame] | 360 | return; |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 361 | |
| 362 | /* This is a short read! */ |
| 363 | nfs_inc_stats(data->inode, NFSIOS_SHORTREAD); |
| 364 | /* Has the server at least made some progress? */ |
| 365 | if (resp->count == 0) |
Trond Myklebust | d61e612 | 2009-12-05 19:32:19 -0500 | [diff] [blame] | 366 | return; |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 367 | |
| 368 | /* Yes, so retry the read at the end of the data */ |
| 369 | argp->offset += resp->count; |
| 370 | argp->pgbase += resp->count; |
| 371 | argp->count -= resp->count; |
Trond Myklebust | 0110ee1 | 2009-12-07 09:00:24 -0500 | [diff] [blame] | 372 | nfs_restart_rpc(task, NFS_SERVER(data->inode)->nfs_client); |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | * Handle a read reply that fills part of a page. |
| 377 | */ |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 378 | static void nfs_readpage_result_partial(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | { |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 380 | struct nfs_read_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 382 | if (nfs_readpage_result(task, data) != 0) |
| 383 | return; |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 384 | if (task->tk_status < 0) |
| 385 | return; |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 386 | |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 387 | nfs_readpage_truncate_uninitialised_page(data); |
| 388 | nfs_readpage_retry(task, data); |
| 389 | } |
| 390 | |
| 391 | static void nfs_readpage_release_partial(void *calldata) |
| 392 | { |
| 393 | struct nfs_read_data *data = calldata; |
| 394 | struct nfs_page *req = data->req; |
| 395 | struct page *page = req->wb_page; |
| 396 | int status = data->task.tk_status; |
| 397 | |
| 398 | if (status < 0) |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 399 | SetPageError(page); |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | if (atomic_dec_and_test(&req->wb_complete)) { |
| 402 | if (!PageError(page)) |
| 403 | SetPageUptodate(page); |
| 404 | nfs_readpage_release(req); |
| 405 | } |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 406 | nfs_readdata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | } |
| 408 | |
Andy Adamson | f11c88a | 2009-04-01 09:22:25 -0400 | [diff] [blame] | 409 | #if defined(CONFIG_NFS_V4_1) |
| 410 | void nfs_read_prepare(struct rpc_task *task, void *calldata) |
| 411 | { |
| 412 | struct nfs_read_data *data = calldata; |
| 413 | |
Trond Myklebust | 035168a | 2010-06-16 09:52:26 -0400 | [diff] [blame] | 414 | if (nfs4_setup_sequence(NFS_SERVER(data->inode), |
Andy Adamson | f11c88a | 2009-04-01 09:22:25 -0400 | [diff] [blame] | 415 | &data->args.seq_args, &data->res.seq_res, |
| 416 | 0, task)) |
| 417 | return; |
| 418 | rpc_call_start(task); |
| 419 | } |
| 420 | #endif /* CONFIG_NFS_V4_1 */ |
| 421 | |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 422 | static const struct rpc_call_ops nfs_read_partial_ops = { |
Andy Adamson | f11c88a | 2009-04-01 09:22:25 -0400 | [diff] [blame] | 423 | #if defined(CONFIG_NFS_V4_1) |
| 424 | .rpc_call_prepare = nfs_read_prepare, |
| 425 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 426 | .rpc_call_done = nfs_readpage_result_partial, |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 427 | .rpc_release = nfs_readpage_release_partial, |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 428 | }; |
| 429 | |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 430 | static void nfs_readpage_set_pages_uptodate(struct nfs_read_data *data) |
| 431 | { |
| 432 | unsigned int count = data->res.count; |
| 433 | unsigned int base = data->args.pgbase; |
| 434 | struct page **pages; |
| 435 | |
Trond Myklebust | 79558f3 | 2006-08-22 13:44:32 -0400 | [diff] [blame] | 436 | if (data->res.eof) |
| 437 | count = data->args.count; |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 438 | if (unlikely(count == 0)) |
| 439 | return; |
| 440 | pages = &data->args.pages[base >> PAGE_CACHE_SHIFT]; |
| 441 | base &= ~PAGE_CACHE_MASK; |
| 442 | count += base; |
| 443 | for (;count >= PAGE_CACHE_SIZE; count -= PAGE_CACHE_SIZE, pages++) |
| 444 | SetPageUptodate(*pages); |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 445 | if (count == 0) |
| 446 | return; |
| 447 | /* Was this a short read? */ |
| 448 | if (data->res.eof || data->res.count == data->args.count) |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 449 | SetPageUptodate(*pages); |
| 450 | } |
| 451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | /* |
| 453 | * This is the callback from RPC telling us whether a reply was |
| 454 | * received or some error occurred (timeout or socket shutdown). |
| 455 | */ |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 456 | static void nfs_readpage_result_full(struct rpc_task *task, void *calldata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | { |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 458 | struct nfs_read_data *data = calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 460 | if (nfs_readpage_result(task, data) != 0) |
| 461 | return; |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 462 | if (task->tk_status < 0) |
| 463 | return; |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 464 | /* |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 465 | * Note: nfs_readpage_retry may change the values of |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 466 | * data->args. In the multi-page case, we therefore need |
Trond Myklebust | 0b67130 | 2006-11-14 16:12:23 -0500 | [diff] [blame] | 467 | * to ensure that we call nfs_readpage_set_pages_uptodate() |
| 468 | * first. |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 469 | */ |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 470 | nfs_readpage_truncate_uninitialised_page(data); |
| 471 | nfs_readpage_set_pages_uptodate(data); |
| 472 | nfs_readpage_retry(task, data); |
| 473 | } |
| 474 | |
| 475 | static void nfs_readpage_release_full(void *calldata) |
| 476 | { |
| 477 | struct nfs_read_data *data = calldata; |
| 478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | while (!list_empty(&data->pages)) { |
| 480 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
Trond Myklebust | 1de3fc1 | 2006-05-25 01:40:44 -0400 | [diff] [blame] | 482 | nfs_list_remove_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | nfs_readpage_release(req); |
| 484 | } |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 485 | nfs_readdata_release(calldata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
| 487 | |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 488 | static const struct rpc_call_ops nfs_read_full_ops = { |
Andy Adamson | f11c88a | 2009-04-01 09:22:25 -0400 | [diff] [blame] | 489 | #if defined(CONFIG_NFS_V4_1) |
| 490 | .rpc_call_prepare = nfs_read_prepare, |
| 491 | #endif /* CONFIG_NFS_V4_1 */ |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 492 | .rpc_call_done = nfs_readpage_result_full, |
Trond Myklebust | fdd1e74 | 2008-04-15 16:33:58 -0400 | [diff] [blame] | 493 | .rpc_release = nfs_readpage_release_full, |
Trond Myklebust | ec06c09 | 2006-03-20 13:44:27 -0500 | [diff] [blame] | 494 | }; |
| 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | * Read a page over NFS. |
| 498 | * We read the page synchronously in the following case: |
| 499 | * - The error flag is set for this page. This happens only when a |
| 500 | * previous async read operation failed. |
| 501 | */ |
| 502 | int nfs_readpage(struct file *file, struct page *page) |
| 503 | { |
| 504 | struct nfs_open_context *ctx; |
| 505 | struct inode *inode = page->mapping->host; |
| 506 | int error; |
| 507 | |
| 508 | dprintk("NFS: nfs_readpage (%p %ld@%lu)\n", |
| 509 | page, PAGE_CACHE_SIZE, page->index); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 510 | nfs_inc_stats(inode, NFSIOS_VFSREADPAGE); |
| 511 | nfs_add_stats(inode, NFSIOS_READPAGES, 1); |
| 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | /* |
| 514 | * Try to flush any pending writes to the file.. |
| 515 | * |
| 516 | * NOTE! Because we own the page lock, there cannot |
| 517 | * be any new pending writes generated at this point |
| 518 | * for this page (other pages can be written to). |
| 519 | */ |
| 520 | error = nfs_wb_page(inode, page); |
| 521 | if (error) |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 522 | goto out_unlock; |
| 523 | if (PageUptodate(page)) |
| 524 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
Trond Myklebust | 5f004cf | 2006-09-14 14:03:14 -0400 | [diff] [blame] | 526 | error = -ESTALE; |
| 527 | if (NFS_STALE(inode)) |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 528 | goto out_unlock; |
Trond Myklebust | 5f004cf | 2006-09-14 14:03:14 -0400 | [diff] [blame] | 529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | if (file == NULL) { |
Trond Myklebust | cf1308f | 2006-11-19 16:44:52 -0500 | [diff] [blame] | 531 | error = -EBADF; |
Trond Myklebust | d530838 | 2005-11-04 15:33:38 -0500 | [diff] [blame] | 532 | ctx = nfs_find_open_context(inode, NULL, FMODE_READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | if (ctx == NULL) |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 534 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } else |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 536 | ctx = get_nfs_open_context(nfs_file_open_context(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
David Howells | 9a9fc1c | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 538 | if (!IS_SYNC(inode)) { |
| 539 | error = nfs_readpage_from_fscache(ctx, inode, page); |
| 540 | if (error == 0) |
| 541 | goto out; |
| 542 | } |
| 543 | |
Trond Myklebust | 8e0969f | 2006-12-13 15:23:44 -0500 | [diff] [blame] | 544 | error = nfs_readpage_async(ctx, inode, page); |
| 545 | |
David Howells | 9a9fc1c | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 546 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | put_nfs_open_context(ctx); |
| 548 | return error; |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 549 | out_unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | unlock_page(page); |
| 551 | return error; |
| 552 | } |
| 553 | |
| 554 | struct nfs_readdesc { |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 555 | struct nfs_pageio_descriptor *pgio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | struct nfs_open_context *ctx; |
| 557 | }; |
| 558 | |
| 559 | static int |
| 560 | readpage_async_filler(void *data, struct page *page) |
| 561 | { |
| 562 | struct nfs_readdesc *desc = (struct nfs_readdesc *)data; |
| 563 | struct inode *inode = page->mapping->host; |
| 564 | struct nfs_page *new; |
| 565 | unsigned int len; |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 566 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
Trond Myklebust | 49a70f2 | 2006-12-05 00:35:38 -0500 | [diff] [blame] | 568 | len = nfs_page_length(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | if (len == 0) |
| 570 | return nfs_return_empty_page(page); |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 571 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | new = nfs_create_request(desc->ctx, inode, page, 0, len); |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 573 | if (IS_ERR(new)) |
| 574 | goto out_error; |
| 575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | if (len < PAGE_CACHE_SIZE) |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 577 | zero_user_segment(page, len, PAGE_CACHE_SIZE); |
Fred Isaman | f8512ad | 2008-03-19 11:24:39 -0400 | [diff] [blame] | 578 | if (!nfs_pageio_add_request(desc->pgio, new)) { |
| 579 | error = desc->pgio->pg_error; |
| 580 | goto out_unlock; |
| 581 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | return 0; |
Trond Myklebust | de05a0c | 2007-05-20 13:05:05 -0400 | [diff] [blame] | 583 | out_error: |
| 584 | error = PTR_ERR(new); |
| 585 | SetPageError(page); |
| 586 | out_unlock: |
| 587 | unlock_page(page); |
| 588 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | int nfs_readpages(struct file *filp, struct address_space *mapping, |
| 592 | struct list_head *pages, unsigned nr_pages) |
| 593 | { |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 594 | struct nfs_pageio_descriptor pgio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | struct nfs_readdesc desc = { |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 596 | .pgio = &pgio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | }; |
| 598 | struct inode *inode = mapping->host; |
| 599 | struct nfs_server *server = NFS_SERVER(inode); |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 600 | size_t rsize = server->rsize; |
| 601 | unsigned long npages; |
Trond Myklebust | 5f004cf | 2006-09-14 14:03:14 -0400 | [diff] [blame] | 602 | int ret = -ESTALE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | dprintk("NFS: nfs_readpages (%s/%Ld %d)\n", |
| 605 | inode->i_sb->s_id, |
| 606 | (long long)NFS_FILEID(inode), |
| 607 | nr_pages); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 608 | nfs_inc_stats(inode, NFSIOS_VFSREADPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Trond Myklebust | 5f004cf | 2006-09-14 14:03:14 -0400 | [diff] [blame] | 610 | if (NFS_STALE(inode)) |
| 611 | goto out; |
| 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | if (filp == NULL) { |
Trond Myklebust | d530838 | 2005-11-04 15:33:38 -0500 | [diff] [blame] | 614 | desc.ctx = nfs_find_open_context(inode, NULL, FMODE_READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | if (desc.ctx == NULL) |
| 616 | return -EBADF; |
| 617 | } else |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 618 | desc.ctx = get_nfs_open_context(nfs_file_open_context(filp)); |
David Howells | 9a9fc1c | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 619 | |
| 620 | /* attempt to read as many of the pages as possible from the cache |
| 621 | * - this returns -ENOBUFS immediately if the cookie is negative |
| 622 | */ |
| 623 | ret = nfs_readpages_from_fscache(desc.ctx, inode, mapping, |
| 624 | pages, &nr_pages); |
| 625 | if (ret == 0) |
| 626 | goto read_complete; /* all pages were read */ |
| 627 | |
Benny Halevy | e5e9401 | 2010-10-20 00:18:01 -0400 | [diff] [blame] | 628 | pnfs_update_layout(inode, desc.ctx, IOMODE_READ); |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 629 | if (rsize < PAGE_CACHE_SIZE) |
| 630 | nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0); |
| 631 | else |
| 632 | nfs_pageio_init(&pgio, inode, nfs_pagein_one, rsize, 0); |
| 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc); |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 635 | |
| 636 | nfs_pageio_complete(&pgio); |
| 637 | npages = (pgio.pg_bytes_written + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
| 638 | nfs_add_stats(inode, NFSIOS_READPAGES, npages); |
David Howells | 9a9fc1c | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 639 | read_complete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | put_nfs_open_context(desc.ctx); |
Trond Myklebust | 5f004cf | 2006-09-14 14:03:14 -0400 | [diff] [blame] | 641 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | return ret; |
| 643 | } |
| 644 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 645 | int __init nfs_init_readpagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | { |
| 647 | nfs_rdata_cachep = kmem_cache_create("nfs_read_data", |
| 648 | sizeof(struct nfs_read_data), |
| 649 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 650 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | if (nfs_rdata_cachep == NULL) |
| 652 | return -ENOMEM; |
| 653 | |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 654 | nfs_rdata_mempool = mempool_create_slab_pool(MIN_POOL_READ, |
| 655 | nfs_rdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | if (nfs_rdata_mempool == NULL) |
| 657 | return -ENOMEM; |
| 658 | |
| 659 | return 0; |
| 660 | } |
| 661 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 662 | void nfs_destroy_readpagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | { |
| 664 | mempool_destroy(nfs_rdata_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 665 | kmem_cache_destroy(nfs_rdata_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | } |