Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/pagelist.c |
| 3 | * |
| 4 | * A set of helper functions for managing NFS read and write requests. |
| 5 | * The main purpose of these routines is to provide support for the |
| 6 | * coalescing of several requests into a single RPC call. |
| 7 | * |
| 8 | * Copyright 2000, 2001 (c) Trond Myklebust <trond.myklebust@fys.uio.no> |
| 9 | * |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/slab.h> |
| 13 | #include <linux/file.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 14 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sunrpc/clnt.h> |
Trond Myklebust | 1313e60 | 2012-01-17 22:04:24 -0500 | [diff] [blame] | 16 | #include <linux/nfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/nfs3.h> |
| 18 | #include <linux/nfs4.h> |
| 19 | #include <linux/nfs_page.h> |
| 20 | #include <linux/nfs_fs.h> |
| 21 | #include <linux/nfs_mount.h> |
Paul Gortmaker | afeacc8 | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 22 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 24 | #include "internal.h" |
Fred Isaman | bae724e | 2011-03-01 01:34:15 +0000 | [diff] [blame] | 25 | #include "pnfs.h" |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 26 | |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 27 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | static struct kmem_cache *nfs_page_cachep; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 30 | static const struct rpc_call_ops nfs_pgio_common_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 32 | static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount) |
Fred Isaman | 30dd374 | 2012-04-20 14:47:45 -0400 | [diff] [blame] | 33 | { |
| 34 | p->npages = pagecount; |
| 35 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
| 36 | p->pagevec = p->page_array; |
| 37 | else { |
| 38 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL); |
| 39 | if (!p->pagevec) |
| 40 | p->npages = 0; |
| 41 | } |
| 42 | return p->pagevec != NULL; |
| 43 | } |
| 44 | |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 45 | struct nfs_pgio_mirror * |
| 46 | nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc) |
| 47 | { |
| 48 | return nfs_pgio_has_mirroring(desc) ? |
| 49 | &desc->pg_mirrors[desc->pg_mirror_idx] : |
| 50 | &desc->pg_mirrors[0]; |
| 51 | } |
| 52 | EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror); |
| 53 | |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 54 | void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, |
| 55 | struct nfs_pgio_header *hdr, |
| 56 | void (*release)(struct nfs_pgio_header *hdr)) |
| 57 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 58 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 59 | |
| 60 | |
| 61 | hdr->req = nfs_list_entry(mirror->pg_list.next); |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 62 | hdr->inode = desc->pg_inode; |
| 63 | hdr->cred = hdr->req->wb_context->cred; |
| 64 | hdr->io_start = req_offset(hdr->req); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 65 | hdr->good_bytes = mirror->pg_count; |
Fred Isaman | 584aa81 | 2012-04-20 14:47:51 -0400 | [diff] [blame] | 66 | hdr->dreq = desc->pg_dreq; |
Peng Tao | f616638 | 2012-08-02 15:36:09 +0300 | [diff] [blame] | 67 | hdr->layout_private = desc->pg_layout_private; |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 68 | hdr->release = release; |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 69 | hdr->completion_ops = desc->pg_completion_ops; |
Fred Isaman | 584aa81 | 2012-04-20 14:47:51 -0400 | [diff] [blame] | 70 | if (hdr->completion_ops->init_hdr) |
| 71 | hdr->completion_ops->init_hdr(hdr); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 72 | |
| 73 | hdr->pgio_mirror_idx = desc->pg_mirror_idx; |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 74 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 75 | EXPORT_SYMBOL_GPL(nfs_pgheader_init); |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 76 | |
| 77 | void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos) |
| 78 | { |
| 79 | spin_lock(&hdr->lock); |
Trond Myklebust | e9ae58a | 2015-08-17 12:57:07 -0500 | [diff] [blame] | 80 | if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags) |
| 81 | || pos < hdr->io_start + hdr->good_bytes) { |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 82 | clear_bit(NFS_IOHDR_EOF, &hdr->flags); |
| 83 | hdr->good_bytes = pos - hdr->io_start; |
| 84 | hdr->error = error; |
| 85 | } |
| 86 | spin_unlock(&hdr->lock); |
| 87 | } |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | static inline struct nfs_page * |
| 90 | nfs_page_alloc(void) |
| 91 | { |
Mel Gorman | 192e501 | 2012-07-31 16:45:16 -0700 | [diff] [blame] | 92 | struct nfs_page *p = kmem_cache_zalloc(nfs_page_cachep, GFP_NOIO); |
Jesper Juhl | 72895b1 | 2010-12-09 23:17:15 +0100 | [diff] [blame] | 93 | if (p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | INIT_LIST_HEAD(&p->wb_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | return p; |
| 96 | } |
| 97 | |
| 98 | static inline void |
| 99 | nfs_page_free(struct nfs_page *p) |
| 100 | { |
| 101 | kmem_cache_free(nfs_page_cachep, p); |
| 102 | } |
| 103 | |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 104 | /** |
| 105 | * nfs_iocounter_wait - wait for i/o to complete |
Benjamin Coddington | 210c7c1 | 2016-01-06 10:40:18 -0500 | [diff] [blame] | 106 | * @l_ctx: nfs_lock_context with io_counter to use |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 107 | * |
| 108 | * returns -ERESTARTSYS if interrupted by a fatal signal. |
| 109 | * Otherwise returns 0 once the io_count hits 0. |
| 110 | */ |
| 111 | int |
Benjamin Coddington | 210c7c1 | 2016-01-06 10:40:18 -0500 | [diff] [blame] | 112 | nfs_iocounter_wait(struct nfs_lock_context *l_ctx) |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 113 | { |
Benjamin Coddington | 210c7c1 | 2016-01-06 10:40:18 -0500 | [diff] [blame] | 114 | return wait_on_atomic_t(&l_ctx->io_count, nfs_wait_atomic_killable, |
| 115 | TASK_KILLABLE); |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 116 | } |
| 117 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 118 | /* |
| 119 | * nfs_page_group_lock - lock the head of the page group |
| 120 | * @req - request in group that is to be locked |
Weston Andros Adamson | fd2f3a0 | 2014-08-08 11:00:53 -0400 | [diff] [blame] | 121 | * @nonblock - if true don't block waiting for lock |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 122 | * |
| 123 | * this lock must be held if modifying the page group list |
Weston Andros Adamson | e702920 | 2014-07-17 20:42:15 -0400 | [diff] [blame] | 124 | * |
Weston Andros Adamson | bc8a309 | 2014-08-08 11:00:54 -0400 | [diff] [blame] | 125 | * return 0 on success, < 0 on error: -EDELAY if nonblocking or the |
| 126 | * result from wait_on_bit_lock |
| 127 | * |
| 128 | * NOTE: calling with nonblock=false should always have set the |
| 129 | * lock bit (see fs/buffer.c and other uses of wait_on_bit_lock |
| 130 | * with TASK_UNINTERRUPTIBLE), so there is no need to check the result. |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 131 | */ |
Weston Andros Adamson | e702920 | 2014-07-17 20:42:15 -0400 | [diff] [blame] | 132 | int |
Weston Andros Adamson | fd2f3a0 | 2014-08-08 11:00:53 -0400 | [diff] [blame] | 133 | nfs_page_group_lock(struct nfs_page *req, bool nonblock) |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 134 | { |
| 135 | struct nfs_page *head = req->wb_head; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 136 | |
| 137 | WARN_ON_ONCE(head != head->wb_head); |
| 138 | |
Weston Andros Adamson | bc8a309 | 2014-08-08 11:00:54 -0400 | [diff] [blame] | 139 | if (!test_and_set_bit(PG_HEADLOCK, &head->wb_flags)) |
| 140 | return 0; |
Weston Andros Adamson | e702920 | 2014-07-17 20:42:15 -0400 | [diff] [blame] | 141 | |
Weston Andros Adamson | bc8a309 | 2014-08-08 11:00:54 -0400 | [diff] [blame] | 142 | if (!nonblock) |
| 143 | return wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK, |
| 144 | TASK_UNINTERRUPTIBLE); |
| 145 | |
| 146 | return -EAGAIN; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | /* |
Weston Andros Adamson | 7c3af97 | 2014-08-08 11:00:57 -0400 | [diff] [blame] | 150 | * nfs_page_group_lock_wait - wait for the lock to clear, but don't grab it |
| 151 | * @req - a request in the group |
| 152 | * |
| 153 | * This is a blocking call to wait for the group lock to be cleared. |
| 154 | */ |
| 155 | void |
| 156 | nfs_page_group_lock_wait(struct nfs_page *req) |
| 157 | { |
| 158 | struct nfs_page *head = req->wb_head; |
| 159 | |
| 160 | WARN_ON_ONCE(head != head->wb_head); |
| 161 | |
| 162 | wait_on_bit(&head->wb_flags, PG_HEADLOCK, |
| 163 | TASK_UNINTERRUPTIBLE); |
| 164 | } |
| 165 | |
| 166 | /* |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 167 | * nfs_page_group_unlock - unlock the head of the page group |
| 168 | * @req - request in group that is to be unlocked |
| 169 | */ |
| 170 | void |
| 171 | nfs_page_group_unlock(struct nfs_page *req) |
| 172 | { |
| 173 | struct nfs_page *head = req->wb_head; |
| 174 | |
| 175 | WARN_ON_ONCE(head != head->wb_head); |
| 176 | |
Linus Torvalds | d1e1cda | 2014-06-10 15:02:42 -0700 | [diff] [blame] | 177 | smp_mb__before_atomic(); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 178 | clear_bit(PG_HEADLOCK, &head->wb_flags); |
Linus Torvalds | d1e1cda | 2014-06-10 15:02:42 -0700 | [diff] [blame] | 179 | smp_mb__after_atomic(); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 180 | wake_up_bit(&head->wb_flags, PG_HEADLOCK); |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * nfs_page_group_sync_on_bit_locked |
| 185 | * |
| 186 | * must be called with page group lock held |
| 187 | */ |
| 188 | static bool |
| 189 | nfs_page_group_sync_on_bit_locked(struct nfs_page *req, unsigned int bit) |
| 190 | { |
| 191 | struct nfs_page *head = req->wb_head; |
| 192 | struct nfs_page *tmp; |
| 193 | |
| 194 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_flags)); |
| 195 | WARN_ON_ONCE(test_and_set_bit(bit, &req->wb_flags)); |
| 196 | |
| 197 | tmp = req->wb_this_page; |
| 198 | while (tmp != req) { |
| 199 | if (!test_bit(bit, &tmp->wb_flags)) |
| 200 | return false; |
| 201 | tmp = tmp->wb_this_page; |
| 202 | } |
| 203 | |
| 204 | /* true! reset all bits */ |
| 205 | tmp = req; |
| 206 | do { |
| 207 | clear_bit(bit, &tmp->wb_flags); |
| 208 | tmp = tmp->wb_this_page; |
| 209 | } while (tmp != req); |
| 210 | |
| 211 | return true; |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * nfs_page_group_sync_on_bit - set bit on current request, but only |
| 216 | * return true if the bit is set for all requests in page group |
| 217 | * @req - request in page group |
| 218 | * @bit - PG_* bit that is used to sync page group |
| 219 | */ |
| 220 | bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit) |
| 221 | { |
| 222 | bool ret; |
| 223 | |
Weston Andros Adamson | fd2f3a0 | 2014-08-08 11:00:53 -0400 | [diff] [blame] | 224 | nfs_page_group_lock(req, false); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 225 | ret = nfs_page_group_sync_on_bit_locked(req, bit); |
| 226 | nfs_page_group_unlock(req); |
| 227 | |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * nfs_page_group_init - Initialize the page group linkage for @req |
| 233 | * @req - a new nfs request |
| 234 | * @prev - the previous request in page group, or NULL if @req is the first |
| 235 | * or only request in the group (the head). |
| 236 | */ |
| 237 | static inline void |
| 238 | nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev) |
| 239 | { |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 240 | struct inode *inode; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 241 | WARN_ON_ONCE(prev == req); |
| 242 | |
| 243 | if (!prev) { |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 244 | /* a head request */ |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 245 | req->wb_head = req; |
| 246 | req->wb_this_page = req; |
| 247 | } else { |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 248 | /* a subrequest */ |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 249 | WARN_ON_ONCE(prev->wb_this_page != prev->wb_head); |
| 250 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags)); |
| 251 | req->wb_head = prev->wb_head; |
| 252 | req->wb_this_page = prev->wb_this_page; |
| 253 | prev->wb_this_page = req; |
| 254 | |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 255 | /* All subrequests take a ref on the head request until |
| 256 | * nfs_page_group_destroy is called */ |
| 257 | kref_get(&req->wb_head->wb_kref); |
| 258 | |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 259 | /* grab extra ref and bump the request count if head request |
| 260 | * has extra ref from the write/commit path to handle handoff |
| 261 | * between write and commit lists. */ |
Weston Andros Adamson | 17089a2 | 2014-07-11 10:20:45 -0400 | [diff] [blame] | 262 | if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) { |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 263 | inode = page_file_mapping(req->wb_page)->host; |
Weston Andros Adamson | 17089a2 | 2014-07-11 10:20:45 -0400 | [diff] [blame] | 264 | set_bit(PG_INODE_REF, &req->wb_flags); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 265 | kref_get(&req->wb_kref); |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 266 | spin_lock(&inode->i_lock); |
| 267 | NFS_I(inode)->nrequests++; |
| 268 | spin_unlock(&inode->i_lock); |
Weston Andros Adamson | 17089a2 | 2014-07-11 10:20:45 -0400 | [diff] [blame] | 269 | } |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 270 | } |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * nfs_page_group_destroy - sync the destruction of page groups |
| 275 | * @req - request that no longer needs the page group |
| 276 | * |
| 277 | * releases the page group reference from each member once all |
| 278 | * members have called this function. |
| 279 | */ |
| 280 | static void |
| 281 | nfs_page_group_destroy(struct kref *kref) |
| 282 | { |
| 283 | struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref); |
| 284 | struct nfs_page *tmp, *next; |
| 285 | |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 286 | /* subrequests must release the ref on the head request */ |
| 287 | if (req->wb_head != req) |
| 288 | nfs_release_request(req->wb_head); |
| 289 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 290 | if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN)) |
| 291 | return; |
| 292 | |
| 293 | tmp = req; |
| 294 | do { |
| 295 | next = tmp->wb_this_page; |
| 296 | /* unlink and free */ |
| 297 | tmp->wb_this_page = tmp; |
| 298 | tmp->wb_head = tmp; |
| 299 | nfs_free_request(tmp); |
| 300 | tmp = next; |
| 301 | } while (tmp != req); |
| 302 | } |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | /** |
| 305 | * nfs_create_request - Create an NFS read/write request. |
Chuck Lever | c02f557 | 2011-10-25 12:17:43 -0400 | [diff] [blame] | 306 | * @ctx: open context to use |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | * @page: page to write |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 308 | * @last: last nfs request created for this page group or NULL if head |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | * @offset: starting offset within the page for the write |
| 310 | * @count: number of bytes to read/write |
| 311 | * |
| 312 | * The page must be locked by the caller. This makes sure we never |
Jason Uhlenkott | a19b89c | 2007-04-26 17:25:51 -0700 | [diff] [blame] | 313 | * create two different requests for the same page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | * User should ensure it is safe to sleep in this function. |
| 315 | */ |
| 316 | struct nfs_page * |
Weston Andros Adamson | 8c8f1ac1 | 2014-05-15 11:56:42 -0400 | [diff] [blame] | 317 | nfs_create_request(struct nfs_open_context *ctx, struct page *page, |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 318 | struct nfs_page *last, unsigned int offset, |
| 319 | unsigned int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | struct nfs_page *req; |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 322 | struct nfs_lock_context *l_ctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Trond Myklebust | c58c844 | 2013-03-18 19:45:14 -0400 | [diff] [blame] | 324 | if (test_bit(NFS_CONTEXT_BAD, &ctx->flags)) |
| 325 | return ERR_PTR(-EBADF); |
Trond Myklebust | 18eb884 | 2010-05-13 12:51:02 -0400 | [diff] [blame] | 326 | /* try to allocate the request struct */ |
| 327 | req = nfs_page_alloc(); |
| 328 | if (req == NULL) |
| 329 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 331 | /* get lock context early so we can deal with alloc failures */ |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 332 | l_ctx = nfs_get_lock_context(ctx); |
| 333 | if (IS_ERR(l_ctx)) { |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 334 | nfs_page_free(req); |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 335 | return ERR_CAST(l_ctx); |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 336 | } |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 337 | req->wb_lock_context = l_ctx; |
Benjamin Coddington | 210c7c1 | 2016-01-06 10:40:18 -0500 | [diff] [blame] | 338 | atomic_inc(&l_ctx->io_count); |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | /* Initialize the request struct. Initially, we assume a |
| 341 | * long write-back delay. This will be adjusted in |
| 342 | * update_nfs_request below if the region is not locked. */ |
| 343 | req->wb_page = page; |
Anna Schumaker | 67911c8 | 2016-01-19 14:37:30 -0500 | [diff] [blame] | 344 | if (page) { |
Huang Ying | 8cd7978 | 2016-10-07 17:00:24 -0700 | [diff] [blame] | 345 | req->wb_index = page_index(page); |
Anna Schumaker | 67911c8 | 2016-01-19 14:37:30 -0500 | [diff] [blame] | 346 | get_page(page); |
| 347 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | req->wb_offset = offset; |
| 349 | req->wb_pgbase = offset; |
| 350 | req->wb_bytes = count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | req->wb_context = get_nfs_open_context(ctx); |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 352 | kref_init(&req->wb_kref); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 353 | nfs_page_group_init(req, last); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | return req; |
| 355 | } |
| 356 | |
| 357 | /** |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 358 | * nfs_unlock_request - Unlock request and wake up sleepers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | * @req: |
| 360 | */ |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 361 | void nfs_unlock_request(struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
| 363 | if (!NFS_WBACK_BUSY(req)) { |
| 364 | printk(KERN_ERR "NFS: Invalid unlock attempted\n"); |
| 365 | BUG(); |
| 366 | } |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 367 | smp_mb__before_atomic(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | clear_bit(PG_BUSY, &req->wb_flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 369 | smp_mb__after_atomic(); |
Trond Myklebust | 464a98b | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 370 | wake_up_bit(&req->wb_flags, PG_BUSY); |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | /** |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 374 | * nfs_unlock_and_release_request - Unlock request and release the nfs_page |
| 375 | * @req: |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 376 | */ |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 377 | void nfs_unlock_and_release_request(struct nfs_page *req) |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 378 | { |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 379 | nfs_unlock_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | nfs_release_request(req); |
| 381 | } |
| 382 | |
Trond Myklebust | 4d65c52 | 2011-03-25 14:15:11 -0400 | [diff] [blame] | 383 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | * nfs_clear_request - Free up all resources allocated to the request |
| 385 | * @req: |
| 386 | * |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 387 | * Release page and open context resources associated with a read/write |
| 388 | * request after it has completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | */ |
Trond Myklebust | 4d65c52 | 2011-03-25 14:15:11 -0400 | [diff] [blame] | 390 | static void nfs_clear_request(struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | { |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 392 | struct page *page = req->wb_page; |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 393 | struct nfs_open_context *ctx = req->wb_context; |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 394 | struct nfs_lock_context *l_ctx = req->wb_lock_context; |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 395 | |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 396 | if (page != NULL) { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 397 | put_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | req->wb_page = NULL; |
| 399 | } |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 400 | if (l_ctx != NULL) { |
Benjamin Coddington | 210c7c1 | 2016-01-06 10:40:18 -0500 | [diff] [blame] | 401 | if (atomic_dec_and_test(&l_ctx->io_count)) |
| 402 | wake_up_atomic_t(&l_ctx->io_count); |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 403 | nfs_put_lock_context(l_ctx); |
| 404 | req->wb_lock_context = NULL; |
| 405 | } |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 406 | if (ctx != NULL) { |
| 407 | put_nfs_open_context(ctx); |
| 408 | req->wb_context = NULL; |
| 409 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
| 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | /** |
| 413 | * nfs_release_request - Release the count on an NFS read/write request |
| 414 | * @req: request to release |
| 415 | * |
| 416 | * Note: Should never be called with the spinlock held! |
| 417 | */ |
Weston Andros Adamson | d458138 | 2014-07-11 10:20:48 -0400 | [diff] [blame] | 418 | void nfs_free_request(struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | { |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 420 | WARN_ON_ONCE(req->wb_this_page != req); |
| 421 | |
| 422 | /* extra debug: make sure no sync bits are still set */ |
| 423 | WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags)); |
Weston Andros Adamson | 67d0338 | 2014-05-15 11:56:46 -0400 | [diff] [blame] | 424 | WARN_ON_ONCE(test_bit(PG_UNLOCKPAGE, &req->wb_flags)); |
| 425 | WARN_ON_ONCE(test_bit(PG_UPTODATE, &req->wb_flags)); |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 426 | WARN_ON_ONCE(test_bit(PG_WB_END, &req->wb_flags)); |
| 427 | WARN_ON_ONCE(test_bit(PG_REMOVE, &req->wb_flags)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 429 | /* Release struct file and open context */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | nfs_clear_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | nfs_page_free(req); |
| 432 | } |
| 433 | |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 434 | void nfs_release_request(struct nfs_page *req) |
| 435 | { |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 436 | kref_put(&req->wb_kref, nfs_page_group_destroy); |
Trond Myklebust | 9f557cd | 2010-02-03 08:27:22 -0500 | [diff] [blame] | 437 | } |
| 438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | /** |
| 440 | * nfs_wait_on_request - Wait for a request to complete. |
| 441 | * @req: request to wait upon. |
| 442 | * |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 443 | * Interruptible by fatal signals only. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | * The user is responsible for holding a count on the request. |
| 445 | */ |
| 446 | int |
| 447 | nfs_wait_on_request(struct nfs_page *req) |
| 448 | { |
NeilBrown | 7431620 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 449 | return wait_on_bit_io(&req->wb_flags, PG_BUSY, |
| 450 | TASK_UNINTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 453 | /* |
| 454 | * nfs_generic_pg_test - determine if requests can be coalesced |
| 455 | * @desc: pointer to descriptor |
| 456 | * @prev: previous request in desc, or NULL |
| 457 | * @req: this request |
| 458 | * |
| 459 | * Returns zero if @req can be coalesced into @desc, otherwise it returns |
| 460 | * the size of the request. |
| 461 | */ |
| 462 | size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, |
| 463 | struct nfs_page *prev, struct nfs_page *req) |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 464 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 465 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 466 | |
| 467 | |
| 468 | if (mirror->pg_count > mirror->pg_bsize) { |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 469 | /* should never happen */ |
| 470 | WARN_ON_ONCE(1); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 471 | return 0; |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 472 | } |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 473 | |
Christoph Hellwig | 2e11f82 | 2014-08-21 11:09:17 -0500 | [diff] [blame] | 474 | /* |
| 475 | * Limit the request size so that we can still allocate a page array |
| 476 | * for it without upsetting the slab allocator. |
| 477 | */ |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 478 | if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) * |
Peng Tao | 048883e | 2015-09-11 11:14:06 +0800 | [diff] [blame] | 479 | sizeof(struct page *) > PAGE_SIZE) |
Christoph Hellwig | 2e11f82 | 2014-08-21 11:09:17 -0500 | [diff] [blame] | 480 | return 0; |
| 481 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 482 | return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 483 | } |
Benny Halevy | 19345cb | 2011-06-19 18:33:46 -0400 | [diff] [blame] | 484 | EXPORT_SYMBOL_GPL(nfs_generic_pg_test); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 485 | |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 486 | struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops) |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 487 | { |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 488 | struct nfs_pgio_header *hdr = ops->rw_alloc_header(); |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 489 | |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 490 | if (hdr) { |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 491 | INIT_LIST_HEAD(&hdr->pages); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 492 | spin_lock_init(&hdr->lock); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 493 | hdr->rw_ops = ops; |
| 494 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 495 | return hdr; |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 496 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 497 | EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 498 | |
| 499 | /* |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 500 | * nfs_pgio_header_free - Free a read or write header |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 501 | * @hdr: The header to free |
| 502 | */ |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 503 | void nfs_pgio_header_free(struct nfs_pgio_header *hdr) |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 504 | { |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 505 | hdr->rw_ops->rw_free_header(hdr); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 506 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 507 | EXPORT_SYMBOL_GPL(nfs_pgio_header_free); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 508 | |
| 509 | /** |
Weston Andros Adamson | 4714fb5 | 2014-06-09 11:48:37 -0400 | [diff] [blame] | 510 | * nfs_pgio_data_destroy - make @hdr suitable for reuse |
| 511 | * |
| 512 | * Frees memory and releases refs from nfs_generic_pgio, so that it may |
| 513 | * be called again. |
| 514 | * |
| 515 | * @hdr: A header that has had nfs_generic_pgio called |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 516 | */ |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 517 | void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr) |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 518 | { |
Trond Myklebust | 3caa0c6 | 2014-10-13 10:26:43 -0400 | [diff] [blame] | 519 | if (hdr->args.context) |
| 520 | put_nfs_open_context(hdr->args.context); |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 521 | if (hdr->page_array.pagevec != hdr->page_array.page_array) |
| 522 | kfree(hdr->page_array.pagevec); |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 523 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 524 | EXPORT_SYMBOL_GPL(nfs_pgio_data_destroy); |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | /** |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 527 | * nfs_pgio_rpcsetup - Set up arguments for a pageio call |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 528 | * @hdr: The pageio hdr |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 529 | * @count: Number of bytes to read |
| 530 | * @offset: Initial offset |
| 531 | * @how: How to commit data (writes only) |
| 532 | * @cinfo: Commit information for the call (writes only) |
| 533 | */ |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 534 | static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr, |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 535 | unsigned int count, unsigned int offset, |
| 536 | int how, struct nfs_commit_info *cinfo) |
| 537 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 538 | struct nfs_page *req = hdr->req; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 539 | |
| 540 | /* Set up the RPC argument and reply structs |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 541 | * NB: take care not to mess about with hdr->commit et al. */ |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 542 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 543 | hdr->args.fh = NFS_FH(hdr->inode); |
| 544 | hdr->args.offset = req_offset(req) + offset; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 545 | /* pnfs_set_layoutcommit needs this */ |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 546 | hdr->mds_offset = hdr->args.offset; |
| 547 | hdr->args.pgbase = req->wb_pgbase + offset; |
| 548 | hdr->args.pages = hdr->page_array.pagevec; |
| 549 | hdr->args.count = count; |
| 550 | hdr->args.context = get_nfs_open_context(req->wb_context); |
| 551 | hdr->args.lock_context = req->wb_lock_context; |
| 552 | hdr->args.stable = NFS_UNSTABLE; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 553 | switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
| 554 | case 0: |
| 555 | break; |
| 556 | case FLUSH_COND_STABLE: |
| 557 | if (nfs_reqs_to_commit(cinfo)) |
| 558 | break; |
| 559 | default: |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 560 | hdr->args.stable = NFS_FILE_SYNC; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 561 | } |
| 562 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 563 | hdr->res.fattr = &hdr->fattr; |
| 564 | hdr->res.count = count; |
| 565 | hdr->res.eof = 0; |
Weston Andros Adamson | c65e625 | 2014-06-09 11:48:36 -0400 | [diff] [blame] | 566 | hdr->res.verf = &hdr->verf; |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 567 | nfs_fattr_init(&hdr->fattr); |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 568 | } |
| 569 | |
| 570 | /** |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 571 | * nfs_pgio_prepare - Prepare pageio hdr to go over the wire |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 572 | * @task: The current task |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 573 | * @calldata: pageio header to prepare |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 574 | */ |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 575 | static void nfs_pgio_prepare(struct rpc_task *task, void *calldata) |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 576 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 577 | struct nfs_pgio_header *hdr = calldata; |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 578 | int err; |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 579 | err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr); |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 580 | if (err) |
| 581 | rpc_exit(task, err); |
| 582 | } |
| 583 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 584 | int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, |
Peng Tao | 46a5ab4 | 2014-06-13 23:02:25 +0800 | [diff] [blame] | 585 | struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 586 | const struct rpc_call_ops *call_ops, int how, int flags) |
| 587 | { |
| 588 | struct rpc_task *task; |
| 589 | struct rpc_message msg = { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 590 | .rpc_argp = &hdr->args, |
| 591 | .rpc_resp = &hdr->res, |
Peng Tao | 46a5ab4 | 2014-06-13 23:02:25 +0800 | [diff] [blame] | 592 | .rpc_cred = cred, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 593 | }; |
| 594 | struct rpc_task_setup task_setup_data = { |
| 595 | .rpc_client = clnt, |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 596 | .task = &hdr->task, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 597 | .rpc_message = &msg, |
| 598 | .callback_ops = call_ops, |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 599 | .callback_data = hdr, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 600 | .workqueue = nfsiod_workqueue, |
| 601 | .flags = RPC_TASK_ASYNC | flags, |
| 602 | }; |
| 603 | int ret = 0; |
| 604 | |
Tom Haynes | abde71f | 2014-06-09 13:12:20 -0700 | [diff] [blame] | 605 | hdr->rw_ops->rw_initiate(hdr, &msg, rpc_ops, &task_setup_data, how); |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 606 | |
Kinglong Mee | b4839eb | 2015-07-01 12:00:13 +0800 | [diff] [blame] | 607 | dprintk("NFS: initiated pgio call " |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 608 | "(req %s/%llu, %u bytes @ offset %llu)\n", |
Anna Schumaker | 343ae53 | 2014-06-20 13:30:26 -0400 | [diff] [blame] | 609 | hdr->inode->i_sb->s_id, |
| 610 | (unsigned long long)NFS_FILEID(hdr->inode), |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 611 | hdr->args.count, |
| 612 | (unsigned long long)hdr->args.offset); |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 613 | |
| 614 | task = rpc_run_task(&task_setup_data); |
| 615 | if (IS_ERR(task)) { |
| 616 | ret = PTR_ERR(task); |
| 617 | goto out; |
| 618 | } |
| 619 | if (how & FLUSH_SYNC) { |
| 620 | ret = rpc_wait_for_completion_task(task); |
| 621 | if (ret == 0) |
| 622 | ret = task->tk_status; |
| 623 | } |
| 624 | rpc_put_task(task); |
| 625 | out: |
| 626 | return ret; |
| 627 | } |
| 628 | EXPORT_SYMBOL_GPL(nfs_initiate_pgio); |
| 629 | |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 630 | /** |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 631 | * nfs_pgio_error - Clean up from a pageio error |
| 632 | * @desc: IO descriptor |
| 633 | * @hdr: pageio header |
| 634 | */ |
Peng Tao | 2bff228 | 2015-12-05 02:03:17 +0800 | [diff] [blame] | 635 | static void nfs_pgio_error(struct nfs_pgio_header *hdr) |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 636 | { |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 637 | set_bit(NFS_IOHDR_REDO, &hdr->flags); |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 638 | nfs_pgio_data_destroy(hdr); |
Weston Andros Adamson | 4714fb5 | 2014-06-09 11:48:37 -0400 | [diff] [blame] | 639 | hdr->completion_ops->completion(hdr); |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | /** |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 643 | * nfs_pgio_release - Release pageio data |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 644 | * @calldata: The pageio header to release |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 645 | */ |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 646 | static void nfs_pgio_release(void *calldata) |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 647 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 648 | struct nfs_pgio_header *hdr = calldata; |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 649 | nfs_pgio_data_destroy(hdr); |
Weston Andros Adamson | 4714fb5 | 2014-06-09 11:48:37 -0400 | [diff] [blame] | 650 | hdr->completion_ops->completion(hdr); |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 651 | } |
| 652 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 653 | static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror, |
| 654 | unsigned int bsize) |
| 655 | { |
| 656 | INIT_LIST_HEAD(&mirror->pg_list); |
| 657 | mirror->pg_bytes_written = 0; |
| 658 | mirror->pg_count = 0; |
| 659 | mirror->pg_bsize = bsize; |
| 660 | mirror->pg_base = 0; |
| 661 | mirror->pg_recoalesce = 0; |
| 662 | } |
| 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | /** |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 665 | * nfs_pageio_init - initialise a page io descriptor |
| 666 | * @desc: pointer to descriptor |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 667 | * @inode: pointer to inode |
Yijing Wang | dfad700 | 2015-06-18 19:37:13 +0800 | [diff] [blame] | 668 | * @pg_ops: pointer to pageio operations |
| 669 | * @compl_ops: pointer to pageio completion operations |
| 670 | * @rw_ops: pointer to nfs read/write operations |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 671 | * @bsize: io block size |
| 672 | * @io_flags: extra parameters for the io function |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 673 | */ |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 674 | void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
| 675 | struct inode *inode, |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 676 | const struct nfs_pageio_ops *pg_ops, |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 677 | const struct nfs_pgio_completion_ops *compl_ops, |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 678 | const struct nfs_rw_ops *rw_ops, |
Trond Myklebust | 84dde76 | 2007-05-04 14:44:06 -0400 | [diff] [blame] | 679 | size_t bsize, |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 680 | int io_flags) |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 681 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 682 | struct nfs_pgio_mirror *new; |
| 683 | int i; |
| 684 | |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 685 | desc->pg_moreio = 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 686 | desc->pg_inode = inode; |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 687 | desc->pg_ops = pg_ops; |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 688 | desc->pg_completion_ops = compl_ops; |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 689 | desc->pg_rw_ops = rw_ops; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 690 | desc->pg_ioflags = io_flags; |
| 691 | desc->pg_error = 0; |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 692 | desc->pg_lseg = NULL; |
Fred Isaman | 584aa81 | 2012-04-20 14:47:51 -0400 | [diff] [blame] | 693 | desc->pg_dreq = NULL; |
Peng Tao | f616638 | 2012-08-02 15:36:09 +0300 | [diff] [blame] | 694 | desc->pg_layout_private = NULL; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 695 | desc->pg_bsize = bsize; |
| 696 | |
| 697 | desc->pg_mirror_count = 1; |
| 698 | desc->pg_mirror_idx = 0; |
| 699 | |
| 700 | if (pg_ops->pg_get_mirror_count) { |
| 701 | /* until we have a request, we don't have an lseg and no |
| 702 | * idea how many mirrors there will be */ |
| 703 | new = kcalloc(NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX, |
| 704 | sizeof(struct nfs_pgio_mirror), GFP_KERNEL); |
| 705 | desc->pg_mirrors_dynamic = new; |
| 706 | desc->pg_mirrors = new; |
| 707 | |
| 708 | for (i = 0; i < NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX; i++) |
| 709 | nfs_pageio_mirror_init(&desc->pg_mirrors[i], bsize); |
| 710 | } else { |
| 711 | desc->pg_mirrors_dynamic = NULL; |
| 712 | desc->pg_mirrors = desc->pg_mirrors_static; |
| 713 | nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize); |
| 714 | } |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 715 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 716 | EXPORT_SYMBOL_GPL(nfs_pageio_init); |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 717 | |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 718 | /** |
| 719 | * nfs_pgio_result - Basic pageio error handling |
| 720 | * @task: The task that ran |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 721 | * @calldata: Pageio header to check |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 722 | */ |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 723 | static void nfs_pgio_result(struct rpc_task *task, void *calldata) |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 724 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 725 | struct nfs_pgio_header *hdr = calldata; |
| 726 | struct inode *inode = hdr->inode; |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 727 | |
| 728 | dprintk("NFS: %s: %5u, (status %d)\n", __func__, |
| 729 | task->tk_pid, task->tk_status); |
| 730 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 731 | if (hdr->rw_ops->rw_done(task, hdr, inode) != 0) |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 732 | return; |
| 733 | if (task->tk_status < 0) |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 734 | nfs_set_pgio_error(hdr, task->tk_status, hdr->args.offset); |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 735 | else |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 736 | hdr->rw_ops->rw_result(task, hdr); |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 737 | } |
| 738 | |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 739 | /* |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 740 | * Create an RPC task for the given read or write request and kick it. |
| 741 | * The page must have been locked by the caller. |
| 742 | * |
| 743 | * It may happen that the page we're passed is not marked dirty. |
| 744 | * This is the case if nfs_updatepage detects a conflicting request |
| 745 | * that has been written but not committed. |
| 746 | */ |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 747 | int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, |
| 748 | struct nfs_pgio_header *hdr) |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 749 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 750 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 751 | |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 752 | struct nfs_page *req; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 753 | struct page **pages, |
| 754 | *last_page; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 755 | struct list_head *head = &mirror->pg_list; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 756 | struct nfs_commit_info cinfo; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 757 | unsigned int pagecount, pageused; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 758 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 759 | pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count); |
Peng Tao | 2bff228 | 2015-12-05 02:03:17 +0800 | [diff] [blame] | 760 | if (!nfs_pgarray_set(&hdr->page_array, pagecount)) { |
| 761 | nfs_pgio_error(hdr); |
| 762 | desc->pg_error = -ENOMEM; |
| 763 | return desc->pg_error; |
| 764 | } |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 765 | |
| 766 | nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 767 | pages = hdr->page_array.pagevec; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 768 | last_page = NULL; |
| 769 | pageused = 0; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 770 | while (!list_empty(head)) { |
| 771 | req = nfs_list_entry(head->next); |
| 772 | nfs_list_remove_request(req); |
| 773 | nfs_list_add_request(req, &hdr->pages); |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 774 | |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 775 | if (!last_page || last_page != req->wb_page) { |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 776 | pageused++; |
Trond Myklebust | b8fb9c3 | 2014-10-13 10:56:12 -0400 | [diff] [blame] | 777 | if (pageused > pagecount) |
| 778 | break; |
| 779 | *pages++ = last_page = req->wb_page; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 780 | } |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 781 | } |
Peng Tao | 2bff228 | 2015-12-05 02:03:17 +0800 | [diff] [blame] | 782 | if (WARN_ON_ONCE(pageused != pagecount)) { |
| 783 | nfs_pgio_error(hdr); |
| 784 | desc->pg_error = -EINVAL; |
| 785 | return desc->pg_error; |
| 786 | } |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 787 | |
| 788 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
| 789 | (desc->pg_moreio || nfs_reqs_to_commit(&cinfo))) |
| 790 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; |
| 791 | |
| 792 | /* Set up the argument struct */ |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 793 | nfs_pgio_rpcsetup(hdr, mirror->pg_count, 0, desc->pg_ioflags, &cinfo); |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 794 | desc->pg_rpc_callops = &nfs_pgio_common_ops; |
| 795 | return 0; |
| 796 | } |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 797 | EXPORT_SYMBOL_GPL(nfs_generic_pgio); |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 798 | |
Anna Schumaker | 41d8d5b | 2014-05-06 09:12:40 -0400 | [diff] [blame] | 799 | static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc) |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 800 | { |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 801 | struct nfs_pgio_header *hdr; |
| 802 | int ret; |
| 803 | |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 804 | hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); |
| 805 | if (!hdr) { |
Peng Tao | 2bff228 | 2015-12-05 02:03:17 +0800 | [diff] [blame] | 806 | desc->pg_error = -ENOMEM; |
| 807 | return desc->pg_error; |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 808 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 809 | nfs_pgheader_init(desc, hdr, nfs_pgio_header_free); |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 810 | ret = nfs_generic_pgio(desc, hdr); |
| 811 | if (ret == 0) |
Weston Andros Adamson | 7f71472 | 2014-05-15 11:56:53 -0400 | [diff] [blame] | 812 | ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode), |
Peng Tao | 46a5ab4 | 2014-06-13 23:02:25 +0800 | [diff] [blame] | 813 | hdr, |
| 814 | hdr->cred, |
| 815 | NFS_PROTO(hdr->inode), |
Tom Haynes | abde71f | 2014-06-09 13:12:20 -0700 | [diff] [blame] | 816 | desc->pg_rpc_callops, |
Weston Andros Adamson | 7f71472 | 2014-05-15 11:56:53 -0400 | [diff] [blame] | 817 | desc->pg_ioflags, 0); |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 818 | return ret; |
| 819 | } |
| 820 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 821 | /* |
| 822 | * nfs_pageio_setup_mirroring - determine if mirroring is to be used |
| 823 | * by calling the pg_get_mirror_count op |
| 824 | */ |
| 825 | static int nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio, |
| 826 | struct nfs_page *req) |
| 827 | { |
| 828 | int mirror_count = 1; |
| 829 | |
| 830 | if (!pgio->pg_ops->pg_get_mirror_count) |
| 831 | return 0; |
| 832 | |
| 833 | mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req); |
| 834 | |
Peng Tao | d600ad1 | 2015-12-04 02:57:48 +0800 | [diff] [blame] | 835 | if (pgio->pg_error < 0) |
| 836 | return pgio->pg_error; |
| 837 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 838 | if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX) |
| 839 | return -EINVAL; |
| 840 | |
| 841 | if (WARN_ON_ONCE(!pgio->pg_mirrors_dynamic)) |
| 842 | return -EINVAL; |
| 843 | |
| 844 | pgio->pg_mirror_count = mirror_count; |
| 845 | |
| 846 | return 0; |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1) |
| 851 | */ |
| 852 | void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio) |
| 853 | { |
| 854 | pgio->pg_mirror_count = 1; |
| 855 | pgio->pg_mirror_idx = 0; |
| 856 | } |
| 857 | |
| 858 | static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio) |
| 859 | { |
| 860 | pgio->pg_mirror_count = 1; |
| 861 | pgio->pg_mirror_idx = 0; |
| 862 | pgio->pg_mirrors = pgio->pg_mirrors_static; |
| 863 | kfree(pgio->pg_mirrors_dynamic); |
| 864 | pgio->pg_mirrors_dynamic = NULL; |
| 865 | } |
| 866 | |
Trond Myklebust | 4109bb7 | 2013-09-06 11:09:38 -0400 | [diff] [blame] | 867 | static bool nfs_match_lock_context(const struct nfs_lock_context *l1, |
| 868 | const struct nfs_lock_context *l2) |
| 869 | { |
| 870 | return l1->lockowner.l_owner == l2->lockowner.l_owner |
| 871 | && l1->lockowner.l_pid == l2->lockowner.l_pid; |
| 872 | } |
| 873 | |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 874 | /** |
| 875 | * nfs_can_coalesce_requests - test two requests for compatibility |
| 876 | * @prev: pointer to nfs_page |
| 877 | * @req: pointer to nfs_page |
| 878 | * |
| 879 | * The nfs_page structures 'prev' and 'req' are compared to ensure that the |
| 880 | * page data area they describe is contiguous, and that their RPC |
| 881 | * credentials, NFSv4 open state, and lockowners are the same. |
| 882 | * |
| 883 | * Return 'true' if this is the case, else return 'false'. |
| 884 | */ |
Benny Halevy | 18ad0a9 | 2011-05-25 21:03:56 +0300 | [diff] [blame] | 885 | static bool nfs_can_coalesce_requests(struct nfs_page *prev, |
| 886 | struct nfs_page *req, |
| 887 | struct nfs_pageio_descriptor *pgio) |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 888 | { |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 889 | size_t size; |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 890 | struct file_lock_context *flctx; |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 891 | |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 892 | if (prev) { |
| 893 | if (!nfs_match_open_context(req->wb_context, prev->wb_context)) |
| 894 | return false; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 895 | flctx = d_inode(req->wb_context->dentry)->i_flctx; |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 896 | if (flctx != NULL && |
| 897 | !(list_empty_careful(&flctx->flc_posix) && |
| 898 | list_empty_careful(&flctx->flc_flock)) && |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 899 | !nfs_match_lock_context(req->wb_lock_context, |
| 900 | prev->wb_lock_context)) |
| 901 | return false; |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 902 | if (req_offset(req) != req_offset(prev) + prev->wb_bytes) |
| 903 | return false; |
Weston Andros Adamson | 78270e8 | 2014-08-14 17:39:33 -0400 | [diff] [blame] | 904 | if (req->wb_page == prev->wb_page) { |
| 905 | if (req->wb_pgbase != prev->wb_pgbase + prev->wb_bytes) |
| 906 | return false; |
| 907 | } else { |
| 908 | if (req->wb_pgbase != 0 || |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 909 | prev->wb_pgbase + prev->wb_bytes != PAGE_SIZE) |
Weston Andros Adamson | 78270e8 | 2014-08-14 17:39:33 -0400 | [diff] [blame] | 910 | return false; |
| 911 | } |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 912 | } |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 913 | size = pgio->pg_ops->pg_test(pgio, prev, req); |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 914 | WARN_ON_ONCE(size > req->wb_bytes); |
| 915 | if (size && size < req->wb_bytes) |
| 916 | req->wb_bytes = size; |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 917 | return size > 0; |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | /** |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 921 | * nfs_pageio_do_add_request - Attempt to coalesce a request into a page list. |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 922 | * @desc: destination io descriptor |
| 923 | * @req: request |
| 924 | * |
| 925 | * Returns true if the request 'req' was successfully coalesced into the |
| 926 | * existing list of pages 'desc'. |
| 927 | */ |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 928 | static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc, |
| 929 | struct nfs_page *req) |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 930 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 931 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 932 | |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 933 | struct nfs_page *prev = NULL; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 934 | |
| 935 | if (mirror->pg_count != 0) { |
| 936 | prev = nfs_list_entry(mirror->pg_list.prev); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 937 | } else { |
Trond Myklebust | d8007d4 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 938 | if (desc->pg_ops->pg_init) |
| 939 | desc->pg_ops->pg_init(desc, req); |
Peng Tao | d600ad1 | 2015-12-04 02:57:48 +0800 | [diff] [blame] | 940 | if (desc->pg_error < 0) |
| 941 | return 0; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 942 | mirror->pg_base = req->wb_pgbase; |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 943 | } |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 944 | if (!nfs_can_coalesce_requests(prev, req, desc)) |
| 945 | return 0; |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 946 | nfs_list_remove_request(req); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 947 | nfs_list_add_request(req, &mirror->pg_list); |
| 948 | mirror->pg_count += req->wb_bytes; |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 949 | return 1; |
| 950 | } |
| 951 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 952 | /* |
| 953 | * Helper for nfs_pageio_add_request and nfs_pageio_complete |
| 954 | */ |
| 955 | static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc) |
| 956 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 957 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 958 | |
| 959 | |
| 960 | if (!list_empty(&mirror->pg_list)) { |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 961 | int error = desc->pg_ops->pg_doio(desc); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 962 | if (error < 0) |
| 963 | desc->pg_error = error; |
| 964 | else |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 965 | mirror->pg_bytes_written += mirror->pg_count; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 966 | } |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 967 | if (list_empty(&mirror->pg_list)) { |
| 968 | mirror->pg_count = 0; |
| 969 | mirror->pg_base = 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 970 | } |
| 971 | } |
| 972 | |
| 973 | /** |
| 974 | * nfs_pageio_add_request - Attempt to coalesce a request into a page list. |
| 975 | * @desc: destination io descriptor |
| 976 | * @req: request |
| 977 | * |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 978 | * This may split a request into subrequests which are all part of the |
| 979 | * same page group. |
| 980 | * |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 981 | * Returns true if the request 'req' was successfully coalesced into the |
| 982 | * existing list of pages 'desc'. |
| 983 | */ |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 984 | static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 985 | struct nfs_page *req) |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 986 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 987 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 988 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 989 | struct nfs_page *subreq; |
| 990 | unsigned int bytes_left = 0; |
| 991 | unsigned int offset, pgbase; |
| 992 | |
Weston Andros Adamson | bfd484a | 2014-08-08 11:00:55 -0400 | [diff] [blame] | 993 | nfs_page_group_lock(req, false); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 994 | |
| 995 | subreq = req; |
| 996 | bytes_left = subreq->wb_bytes; |
| 997 | offset = subreq->wb_offset; |
| 998 | pgbase = subreq->wb_pgbase; |
| 999 | |
| 1000 | do { |
| 1001 | if (!nfs_pageio_do_add_request(desc, subreq)) { |
| 1002 | /* make sure pg_test call(s) did nothing */ |
| 1003 | WARN_ON_ONCE(subreq->wb_bytes != bytes_left); |
| 1004 | WARN_ON_ONCE(subreq->wb_offset != offset); |
| 1005 | WARN_ON_ONCE(subreq->wb_pgbase != pgbase); |
| 1006 | |
| 1007 | nfs_page_group_unlock(req); |
| 1008 | desc->pg_moreio = 1; |
| 1009 | nfs_pageio_doio(desc); |
| 1010 | if (desc->pg_error < 0) |
| 1011 | return 0; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1012 | if (mirror->pg_recoalesce) |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1013 | return 0; |
| 1014 | /* retry add_request for this subreq */ |
Weston Andros Adamson | bfd484a | 2014-08-08 11:00:55 -0400 | [diff] [blame] | 1015 | nfs_page_group_lock(req, false); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1016 | continue; |
| 1017 | } |
| 1018 | |
| 1019 | /* check for buggy pg_test call(s) */ |
| 1020 | WARN_ON_ONCE(subreq->wb_bytes + subreq->wb_pgbase > PAGE_SIZE); |
| 1021 | WARN_ON_ONCE(subreq->wb_bytes > bytes_left); |
| 1022 | WARN_ON_ONCE(subreq->wb_bytes == 0); |
| 1023 | |
| 1024 | bytes_left -= subreq->wb_bytes; |
| 1025 | offset += subreq->wb_bytes; |
| 1026 | pgbase += subreq->wb_bytes; |
| 1027 | |
| 1028 | if (bytes_left) { |
| 1029 | subreq = nfs_create_request(req->wb_context, |
| 1030 | req->wb_page, |
| 1031 | subreq, pgbase, bytes_left); |
Trond Myklebust | c110955 | 2014-05-29 11:38:15 -0400 | [diff] [blame] | 1032 | if (IS_ERR(subreq)) |
| 1033 | goto err_ptr; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1034 | nfs_lock_request(subreq); |
| 1035 | subreq->wb_offset = offset; |
| 1036 | subreq->wb_index = req->wb_index; |
| 1037 | } |
| 1038 | } while (bytes_left > 0); |
| 1039 | |
| 1040 | nfs_page_group_unlock(req); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1041 | return 1; |
Trond Myklebust | c110955 | 2014-05-29 11:38:15 -0400 | [diff] [blame] | 1042 | err_ptr: |
| 1043 | desc->pg_error = PTR_ERR(subreq); |
| 1044 | nfs_page_group_unlock(req); |
| 1045 | return 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1046 | } |
| 1047 | |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1048 | static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc) |
| 1049 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 1050 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1051 | LIST_HEAD(head); |
| 1052 | |
| 1053 | do { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1054 | list_splice_init(&mirror->pg_list, &head); |
| 1055 | mirror->pg_bytes_written -= mirror->pg_count; |
| 1056 | mirror->pg_count = 0; |
| 1057 | mirror->pg_base = 0; |
| 1058 | mirror->pg_recoalesce = 0; |
| 1059 | |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1060 | while (!list_empty(&head)) { |
| 1061 | struct nfs_page *req; |
| 1062 | |
| 1063 | req = list_first_entry(&head, struct nfs_page, wb_list); |
| 1064 | nfs_list_remove_request(req); |
| 1065 | if (__nfs_pageio_add_request(desc, req)) |
| 1066 | continue; |
Trond Myklebust | 03d5eb6 | 2015-07-27 10:23:19 -0400 | [diff] [blame] | 1067 | if (desc->pg_error < 0) { |
| 1068 | list_splice_tail(&head, &mirror->pg_list); |
| 1069 | mirror->pg_recoalesce = 1; |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1070 | return 0; |
Trond Myklebust | 03d5eb6 | 2015-07-27 10:23:19 -0400 | [diff] [blame] | 1071 | } |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1072 | break; |
| 1073 | } |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1074 | } while (mirror->pg_recoalesce); |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1075 | return 1; |
| 1076 | } |
| 1077 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1078 | static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc, |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1079 | struct nfs_page *req) |
| 1080 | { |
| 1081 | int ret; |
| 1082 | |
| 1083 | do { |
| 1084 | ret = __nfs_pageio_add_request(desc, req); |
| 1085 | if (ret) |
| 1086 | break; |
| 1087 | if (desc->pg_error < 0) |
| 1088 | break; |
| 1089 | ret = nfs_do_recoalesce(desc); |
| 1090 | } while (ret); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1091 | |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1092 | return ret; |
| 1093 | } |
| 1094 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1095 | int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
| 1096 | struct nfs_page *req) |
| 1097 | { |
| 1098 | u32 midx; |
| 1099 | unsigned int pgbase, offset, bytes; |
| 1100 | struct nfs_page *dupreq, *lastreq; |
| 1101 | |
| 1102 | pgbase = req->wb_pgbase; |
| 1103 | offset = req->wb_offset; |
| 1104 | bytes = req->wb_bytes; |
| 1105 | |
| 1106 | nfs_pageio_setup_mirroring(desc, req); |
Peng Tao | d600ad1 | 2015-12-04 02:57:48 +0800 | [diff] [blame] | 1107 | if (desc->pg_error < 0) |
Peng Tao | c18b96a | 2015-12-05 01:59:56 +0800 | [diff] [blame] | 1108 | goto out_failed; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1109 | |
| 1110 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { |
| 1111 | if (midx) { |
| 1112 | nfs_page_group_lock(req, false); |
| 1113 | |
| 1114 | /* find the last request */ |
| 1115 | for (lastreq = req->wb_head; |
| 1116 | lastreq->wb_this_page != req->wb_head; |
| 1117 | lastreq = lastreq->wb_this_page) |
| 1118 | ; |
| 1119 | |
| 1120 | dupreq = nfs_create_request(req->wb_context, |
| 1121 | req->wb_page, lastreq, pgbase, bytes); |
| 1122 | |
| 1123 | if (IS_ERR(dupreq)) { |
| 1124 | nfs_page_group_unlock(req); |
Peng Tao | c18b96a | 2015-12-05 01:59:56 +0800 | [diff] [blame] | 1125 | desc->pg_error = PTR_ERR(dupreq); |
| 1126 | goto out_failed; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1127 | } |
| 1128 | |
| 1129 | nfs_lock_request(dupreq); |
| 1130 | nfs_page_group_unlock(req); |
| 1131 | dupreq->wb_offset = offset; |
| 1132 | dupreq->wb_index = req->wb_index; |
| 1133 | } else |
| 1134 | dupreq = req; |
| 1135 | |
Peng Tao | 47af81f | 2014-11-10 08:35:34 +0800 | [diff] [blame] | 1136 | if (nfs_pgio_has_mirroring(desc)) |
| 1137 | desc->pg_mirror_idx = midx; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1138 | if (!nfs_pageio_add_request_mirror(desc, dupreq)) |
Peng Tao | c18b96a | 2015-12-05 01:59:56 +0800 | [diff] [blame] | 1139 | goto out_failed; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1140 | } |
| 1141 | |
| 1142 | return 1; |
Peng Tao | c18b96a | 2015-12-05 01:59:56 +0800 | [diff] [blame] | 1143 | |
| 1144 | out_failed: |
| 1145 | /* |
| 1146 | * We might have failed before sending any reqs over wire. |
Peng Tao | 2bff228 | 2015-12-05 02:03:17 +0800 | [diff] [blame] | 1147 | * Clean up rest of the reqs in mirror pg_list. |
Peng Tao | c18b96a | 2015-12-05 01:59:56 +0800 | [diff] [blame] | 1148 | */ |
Peng Tao | 2bff228 | 2015-12-05 02:03:17 +0800 | [diff] [blame] | 1149 | if (desc->pg_error) { |
| 1150 | struct nfs_pgio_mirror *mirror; |
| 1151 | void (*func)(struct list_head *); |
| 1152 | |
| 1153 | /* remember fatal errors */ |
| 1154 | if (nfs_error_is_fatal(desc->pg_error)) |
| 1155 | mapping_set_error(desc->pg_inode->i_mapping, |
| 1156 | desc->pg_error); |
| 1157 | |
| 1158 | func = desc->pg_completion_ops->error_cleanup; |
| 1159 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { |
| 1160 | mirror = &desc->pg_mirrors[midx]; |
| 1161 | func(&mirror->pg_list); |
| 1162 | } |
| 1163 | } |
Peng Tao | c18b96a | 2015-12-05 01:59:56 +0800 | [diff] [blame] | 1164 | return 0; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1165 | } |
| 1166 | |
| 1167 | /* |
| 1168 | * nfs_pageio_complete_mirror - Complete I/O on the current mirror of an |
| 1169 | * nfs_pageio_descriptor |
| 1170 | * @desc: pointer to io descriptor |
Yijing Wang | dfad700 | 2015-06-18 19:37:13 +0800 | [diff] [blame] | 1171 | * @mirror_idx: pointer to mirror index |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1172 | */ |
| 1173 | static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc, |
| 1174 | u32 mirror_idx) |
| 1175 | { |
| 1176 | struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx]; |
| 1177 | u32 restore_idx = desc->pg_mirror_idx; |
| 1178 | |
Peng Tao | 47af81f | 2014-11-10 08:35:34 +0800 | [diff] [blame] | 1179 | if (nfs_pgio_has_mirroring(desc)) |
| 1180 | desc->pg_mirror_idx = mirror_idx; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1181 | for (;;) { |
| 1182 | nfs_pageio_doio(desc); |
| 1183 | if (!mirror->pg_recoalesce) |
| 1184 | break; |
| 1185 | if (!nfs_do_recoalesce(desc)) |
| 1186 | break; |
| 1187 | } |
| 1188 | desc->pg_mirror_idx = restore_idx; |
| 1189 | } |
| 1190 | |
Weston Andros Adamson | 53113ad | 2014-06-09 11:48:38 -0400 | [diff] [blame] | 1191 | /* |
| 1192 | * nfs_pageio_resend - Transfer requests to new descriptor and resend |
| 1193 | * @hdr - the pgio header to move request from |
| 1194 | * @desc - the pageio descriptor to add requests to |
| 1195 | * |
| 1196 | * Try to move each request (nfs_page) from @hdr to @desc then attempt |
| 1197 | * to send them. |
| 1198 | * |
| 1199 | * Returns 0 on success and < 0 on error. |
| 1200 | */ |
| 1201 | int nfs_pageio_resend(struct nfs_pageio_descriptor *desc, |
| 1202 | struct nfs_pgio_header *hdr) |
| 1203 | { |
| 1204 | LIST_HEAD(failed); |
| 1205 | |
| 1206 | desc->pg_dreq = hdr->dreq; |
| 1207 | while (!list_empty(&hdr->pages)) { |
| 1208 | struct nfs_page *req = nfs_list_entry(hdr->pages.next); |
| 1209 | |
| 1210 | nfs_list_remove_request(req); |
| 1211 | if (!nfs_pageio_add_request(desc, req)) |
| 1212 | nfs_list_add_request(req, &failed); |
| 1213 | } |
| 1214 | nfs_pageio_complete(desc); |
| 1215 | if (!list_empty(&failed)) { |
| 1216 | list_move(&failed, &hdr->pages); |
Peng Tao | d600ad1 | 2015-12-04 02:57:48 +0800 | [diff] [blame] | 1217 | return desc->pg_error < 0 ? desc->pg_error : -EIO; |
Weston Andros Adamson | 53113ad | 2014-06-09 11:48:38 -0400 | [diff] [blame] | 1218 | } |
| 1219 | return 0; |
| 1220 | } |
| 1221 | EXPORT_SYMBOL_GPL(nfs_pageio_resend); |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1222 | |
| 1223 | /** |
Weston Andros Adamson | 2176bf4 | 2014-09-10 15:44:18 -0400 | [diff] [blame] | 1224 | * nfs_pageio_complete - Complete I/O then cleanup an nfs_pageio_descriptor |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1225 | * @desc: pointer to io descriptor |
| 1226 | */ |
| 1227 | void nfs_pageio_complete(struct nfs_pageio_descriptor *desc) |
| 1228 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1229 | u32 midx; |
| 1230 | |
| 1231 | for (midx = 0; midx < desc->pg_mirror_count; midx++) |
| 1232 | nfs_pageio_complete_mirror(desc, midx); |
Weston Andros Adamson | 2176bf4 | 2014-09-10 15:44:18 -0400 | [diff] [blame] | 1233 | |
| 1234 | if (desc->pg_ops->pg_cleanup) |
| 1235 | desc->pg_ops->pg_cleanup(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1236 | nfs_pageio_cleanup_mirroring(desc); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1237 | } |
| 1238 | |
Trond Myklebust | 7fe7f84 | 2007-05-20 10:18:27 -0400 | [diff] [blame] | 1239 | /** |
| 1240 | * nfs_pageio_cond_complete - Conditional I/O completion |
| 1241 | * @desc: pointer to io descriptor |
| 1242 | * @index: page index |
| 1243 | * |
| 1244 | * It is important to ensure that processes don't try to take locks |
| 1245 | * on non-contiguous ranges of pages as that might deadlock. This |
| 1246 | * function should be called before attempting to wait on a locked |
| 1247 | * nfs_page. It will complete the I/O if the page index 'index' |
| 1248 | * is not contiguous with the existing list of pages in 'desc'. |
| 1249 | */ |
| 1250 | void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index) |
| 1251 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1252 | struct nfs_pgio_mirror *mirror; |
| 1253 | struct nfs_page *prev; |
| 1254 | u32 midx; |
| 1255 | |
| 1256 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { |
| 1257 | mirror = &desc->pg_mirrors[midx]; |
| 1258 | if (!list_empty(&mirror->pg_list)) { |
| 1259 | prev = nfs_list_entry(mirror->pg_list.prev); |
| 1260 | if (index != prev->wb_index + 1) |
| 1261 | nfs_pageio_complete_mirror(desc, midx); |
| 1262 | } |
Trond Myklebust | 7fe7f84 | 2007-05-20 10:18:27 -0400 | [diff] [blame] | 1263 | } |
| 1264 | } |
| 1265 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 1266 | int __init nfs_init_nfspagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | { |
| 1268 | nfs_page_cachep = kmem_cache_create("nfs_page", |
| 1269 | sizeof(struct nfs_page), |
| 1270 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1271 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | if (nfs_page_cachep == NULL) |
| 1273 | return -ENOMEM; |
| 1274 | |
| 1275 | return 0; |
| 1276 | } |
| 1277 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 1278 | void nfs_destroy_nfspagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1280 | kmem_cache_destroy(nfs_page_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | } |
| 1282 | |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 1283 | static const struct rpc_call_ops nfs_pgio_common_ops = { |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 1284 | .rpc_call_prepare = nfs_pgio_prepare, |
| 1285 | .rpc_call_done = nfs_pgio_result, |
| 1286 | .rpc_release = nfs_pgio_release, |
| 1287 | }; |
Anna Schumaker | 41d8d5b | 2014-05-06 09:12:40 -0400 | [diff] [blame] | 1288 | |
| 1289 | const struct nfs_pageio_ops nfs_pgio_rw_ops = { |
| 1290 | .pg_test = nfs_generic_pg_test, |
| 1291 | .pg_doio = nfs_generic_pg_pgios, |
| 1292 | }; |