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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
124e68e7 | 2 | |
3d14c5d2 | 3 | #include <linux/module.h> |
124e68e7 | 4 | #include <linux/sched.h> |
5a0e3ad6 | 5 | #include <linux/slab.h> |
124e68e7 SW |
6 | #include <linux/file.h> |
7 | #include <linux/namei.h> | |
8 | #include <linux/writeback.h> | |
9 | ||
10 | #include "super.h" | |
11 | #include "mds_client.h" | |
12 | ||
13 | /* | |
14 | * Ceph file operations | |
15 | * | |
16 | * Implement basic open/close functionality, and implement | |
17 | * read/write. | |
18 | * | |
19 | * We implement three modes of file I/O: | |
20 | * - buffered uses the generic_file_aio_{read,write} helpers | |
21 | * | |
22 | * - synchronous is used when there is multi-client read/write | |
23 | * sharing, avoids the page cache, and synchronously waits for an | |
24 | * ack from the OSD. | |
25 | * | |
26 | * - direct io takes the variant of the sync path that references | |
27 | * user pages directly. | |
28 | * | |
29 | * fsync() flushes and waits on dirty pages, but just queues metadata | |
30 | * for writeback: since the MDS can recover size and mtime there is no | |
31 | * need to wait for MDS acknowledgement. | |
32 | */ | |
33 | ||
34 | ||
35 | /* | |
36 | * Prepare an open request. Preallocate ceph_cap to avoid an | |
37 | * inopportune ENOMEM later. | |
38 | */ | |
39 | static struct ceph_mds_request * | |
40 | prepare_open_request(struct super_block *sb, int flags, int create_mode) | |
41 | { | |
3d14c5d2 YS |
42 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
43 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
44 | struct ceph_mds_request *req; |
45 | int want_auth = USE_ANY_MDS; | |
46 | int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; | |
47 | ||
48 | if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) | |
49 | want_auth = USE_AUTH_MDS; | |
50 | ||
51 | req = ceph_mdsc_create_request(mdsc, op, want_auth); | |
52 | if (IS_ERR(req)) | |
53 | goto out; | |
54 | req->r_fmode = ceph_flags_to_mode(flags); | |
55 | req->r_args.open.flags = cpu_to_le32(flags); | |
56 | req->r_args.open.mode = cpu_to_le32(create_mode); | |
6a18be16 | 57 | req->r_args.open.preferred = cpu_to_le32(-1); |
124e68e7 SW |
58 | out: |
59 | return req; | |
60 | } | |
61 | ||
62 | /* | |
63 | * initialize private struct file data. | |
64 | * if we fail, clean up by dropping fmode reference on the ceph_inode | |
65 | */ | |
66 | static int ceph_init_file(struct inode *inode, struct file *file, int fmode) | |
67 | { | |
68 | struct ceph_file_info *cf; | |
69 | int ret = 0; | |
70 | ||
71 | switch (inode->i_mode & S_IFMT) { | |
72 | case S_IFREG: | |
73 | case S_IFDIR: | |
74 | dout("init_file %p %p 0%o (regular)\n", inode, file, | |
75 | inode->i_mode); | |
76 | cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO); | |
77 | if (cf == NULL) { | |
78 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
79 | return -ENOMEM; | |
80 | } | |
81 | cf->fmode = fmode; | |
82 | cf->next_offset = 2; | |
83 | file->private_data = cf; | |
84 | BUG_ON(inode->i_fop->release != ceph_release); | |
85 | break; | |
86 | ||
87 | case S_IFLNK: | |
88 | dout("init_file %p %p 0%o (symlink)\n", inode, file, | |
89 | inode->i_mode); | |
90 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
91 | break; | |
92 | ||
93 | default: | |
94 | dout("init_file %p %p 0%o (special)\n", inode, file, | |
95 | inode->i_mode); | |
96 | /* | |
97 | * we need to drop the open ref now, since we don't | |
98 | * have .release set to ceph_release. | |
99 | */ | |
100 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
101 | BUG_ON(inode->i_fop->release == ceph_release); | |
102 | ||
103 | /* call the proper open fop */ | |
104 | ret = inode->i_fop->open(inode, file); | |
105 | } | |
106 | return ret; | |
107 | } | |
108 | ||
109 | /* | |
110 | * If the filp already has private_data, that means the file was | |
111 | * already opened by intent during lookup, and we do nothing. | |
112 | * | |
113 | * If we already have the requisite capabilities, we can satisfy | |
114 | * the open request locally (no need to request new caps from the | |
115 | * MDS). We do, however, need to inform the MDS (asynchronously) | |
116 | * if our wanted caps set expands. | |
117 | */ | |
118 | int ceph_open(struct inode *inode, struct file *file) | |
119 | { | |
120 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 YS |
121 | struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); |
122 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
123 | struct ceph_mds_request *req; |
124 | struct ceph_file_info *cf = file->private_data; | |
125 | struct inode *parent_inode = file->f_dentry->d_parent->d_inode; | |
126 | int err; | |
127 | int flags, fmode, wanted; | |
128 | ||
129 | if (cf) { | |
130 | dout("open file %p is already opened\n", file); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ | |
135 | flags = file->f_flags & ~(O_CREAT|O_EXCL); | |
136 | if (S_ISDIR(inode->i_mode)) | |
137 | flags = O_DIRECTORY; /* mds likes to know */ | |
138 | ||
139 | dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, | |
140 | ceph_vinop(inode), file, flags, file->f_flags); | |
141 | fmode = ceph_flags_to_mode(flags); | |
142 | wanted = ceph_caps_for_mode(fmode); | |
143 | ||
144 | /* snapped files are read-only */ | |
145 | if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) | |
146 | return -EROFS; | |
147 | ||
148 | /* trivially open snapdir */ | |
149 | if (ceph_snap(inode) == CEPH_SNAPDIR) { | |
150 | spin_lock(&inode->i_lock); | |
151 | __ceph_get_fmode(ci, fmode); | |
152 | spin_unlock(&inode->i_lock); | |
153 | return ceph_init_file(inode, file, fmode); | |
154 | } | |
155 | ||
156 | /* | |
7421ab80 SW |
157 | * No need to block if we have caps on the auth MDS (for |
158 | * write) or any MDS (for read). Update wanted set | |
124e68e7 SW |
159 | * asynchronously. |
160 | */ | |
161 | spin_lock(&inode->i_lock); | |
7421ab80 SW |
162 | if (__ceph_is_any_real_caps(ci) && |
163 | (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { | |
124e68e7 SW |
164 | int mds_wanted = __ceph_caps_mds_wanted(ci); |
165 | int issued = __ceph_caps_issued(ci, NULL); | |
166 | ||
167 | dout("open %p fmode %d want %s issued %s using existing\n", | |
168 | inode, fmode, ceph_cap_string(wanted), | |
169 | ceph_cap_string(issued)); | |
170 | __ceph_get_fmode(ci, fmode); | |
171 | spin_unlock(&inode->i_lock); | |
172 | ||
173 | /* adjust wanted? */ | |
174 | if ((issued & wanted) != wanted && | |
175 | (mds_wanted & wanted) != wanted && | |
176 | ceph_snap(inode) != CEPH_SNAPDIR) | |
177 | ceph_check_caps(ci, 0, NULL); | |
178 | ||
179 | return ceph_init_file(inode, file, fmode); | |
180 | } else if (ceph_snap(inode) != CEPH_NOSNAP && | |
181 | (ci->i_snap_caps & wanted) == wanted) { | |
182 | __ceph_get_fmode(ci, fmode); | |
183 | spin_unlock(&inode->i_lock); | |
184 | return ceph_init_file(inode, file, fmode); | |
185 | } | |
186 | spin_unlock(&inode->i_lock); | |
187 | ||
188 | dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); | |
189 | req = prepare_open_request(inode->i_sb, flags, 0); | |
190 | if (IS_ERR(req)) { | |
191 | err = PTR_ERR(req); | |
192 | goto out; | |
193 | } | |
194 | req->r_inode = igrab(inode); | |
195 | req->r_num_caps = 1; | |
196 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); | |
197 | if (!err) | |
198 | err = ceph_init_file(inode, file, req->r_fmode); | |
199 | ceph_mdsc_put_request(req); | |
200 | dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); | |
201 | out: | |
202 | return err; | |
203 | } | |
204 | ||
205 | ||
206 | /* | |
207 | * Do a lookup + open with a single request. | |
208 | * | |
209 | * If this succeeds, but some subsequent check in the vfs | |
210 | * may_open() fails, the struct *file gets cleaned up (i.e. | |
211 | * ceph_release gets called). So fear not! | |
212 | */ | |
213 | /* | |
214 | * flags | |
215 | * path_lookup_open -> LOOKUP_OPEN | |
216 | * path_lookup_create -> LOOKUP_OPEN|LOOKUP_CREATE | |
217 | */ | |
218 | struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry, | |
219 | struct nameidata *nd, int mode, | |
220 | int locked_dir) | |
221 | { | |
3d14c5d2 YS |
222 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
223 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
224 | struct file *file = nd->intent.open.file; |
225 | struct inode *parent_inode = get_dentry_parent_inode(file->f_dentry); | |
226 | struct ceph_mds_request *req; | |
227 | int err; | |
228 | int flags = nd->intent.open.flags - 1; /* silly vfs! */ | |
229 | ||
230 | dout("ceph_lookup_open dentry %p '%.*s' flags %d mode 0%o\n", | |
231 | dentry, dentry->d_name.len, dentry->d_name.name, flags, mode); | |
232 | ||
233 | /* do the open */ | |
234 | req = prepare_open_request(dir->i_sb, flags, mode); | |
235 | if (IS_ERR(req)) | |
7e34bc52 | 236 | return ERR_CAST(req); |
124e68e7 SW |
237 | req->r_dentry = dget(dentry); |
238 | req->r_num_caps = 2; | |
239 | if (flags & O_CREAT) { | |
240 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
241 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
242 | } | |
243 | req->r_locked_dir = dir; /* caller holds dir->i_mutex */ | |
244 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); | |
245 | dentry = ceph_finish_lookup(req, dentry, err); | |
246 | if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) | |
247 | err = ceph_handle_notrace_create(dir, dentry); | |
248 | if (!err) | |
249 | err = ceph_init_file(req->r_dentry->d_inode, file, | |
250 | req->r_fmode); | |
251 | ceph_mdsc_put_request(req); | |
252 | dout("ceph_lookup_open result=%p\n", dentry); | |
253 | return dentry; | |
254 | } | |
255 | ||
256 | int ceph_release(struct inode *inode, struct file *file) | |
257 | { | |
258 | struct ceph_inode_info *ci = ceph_inode(inode); | |
259 | struct ceph_file_info *cf = file->private_data; | |
260 | ||
261 | dout("release inode %p file %p\n", inode, file); | |
262 | ceph_put_fmode(ci, cf->fmode); | |
263 | if (cf->last_readdir) | |
264 | ceph_mdsc_put_request(cf->last_readdir); | |
265 | kfree(cf->last_name); | |
266 | kfree(cf->dir_info); | |
267 | dput(cf->dentry); | |
268 | kmem_cache_free(ceph_file_cachep, cf); | |
195d3ce2 SW |
269 | |
270 | /* wake up anyone waiting for caps on this inode */ | |
03066f23 | 271 | wake_up_all(&ci->i_cap_wq); |
124e68e7 SW |
272 | return 0; |
273 | } | |
274 | ||
124e68e7 SW |
275 | /* |
276 | * Read a range of bytes striped over one or more objects. Iterate over | |
277 | * objects we stripe over. (That's not atomic, but good enough for now.) | |
278 | * | |
279 | * If we get a short result from the OSD, check against i_size; we need to | |
280 | * only return a short read to the caller if we hit EOF. | |
281 | */ | |
282 | static int striped_read(struct inode *inode, | |
283 | u64 off, u64 len, | |
6a026589 | 284 | struct page **pages, int num_pages, |
ab226e21 HC |
285 | int *checkeof, bool align_to_pages, |
286 | unsigned long buf_align) | |
124e68e7 | 287 | { |
3d14c5d2 | 288 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 SW |
289 | struct ceph_inode_info *ci = ceph_inode(inode); |
290 | u64 pos, this_len; | |
b7495fc2 | 291 | int io_align, page_align; |
972f0d3a | 292 | int page_off = off & ~PAGE_CACHE_MASK; /* first byte's offset in page */ |
124e68e7 SW |
293 | int left, pages_left; |
294 | int read; | |
295 | struct page **page_pos; | |
296 | int ret; | |
297 | bool hit_stripe, was_short; | |
298 | ||
299 | /* | |
300 | * we may need to do multiple reads. not atomic, unfortunately. | |
301 | */ | |
302 | pos = off; | |
303 | left = len; | |
304 | page_pos = pages; | |
305 | pages_left = num_pages; | |
306 | read = 0; | |
b7495fc2 | 307 | io_align = off & ~PAGE_MASK; |
124e68e7 SW |
308 | |
309 | more: | |
b7495fc2 | 310 | if (align_to_pages) |
ab226e21 | 311 | page_align = (pos - io_align + buf_align) & ~PAGE_MASK; |
b7495fc2 SW |
312 | else |
313 | page_align = pos & ~PAGE_MASK; | |
124e68e7 | 314 | this_len = left; |
3d14c5d2 | 315 | ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
124e68e7 SW |
316 | &ci->i_layout, pos, &this_len, |
317 | ci->i_truncate_seq, | |
318 | ci->i_truncate_size, | |
b7495fc2 | 319 | page_pos, pages_left, page_align); |
124e68e7 SW |
320 | hit_stripe = this_len < left; |
321 | was_short = ret >= 0 && ret < this_len; | |
322 | if (ret == -ENOENT) | |
323 | ret = 0; | |
324 | dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read, | |
325 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); | |
326 | ||
327 | if (ret > 0) { | |
328 | int didpages = | |
329 | ((pos & ~PAGE_CACHE_MASK) + ret) >> PAGE_CACHE_SHIFT; | |
330 | ||
331 | if (read < pos - off) { | |
332 | dout(" zero gap %llu to %llu\n", off + read, pos); | |
3d14c5d2 YS |
333 | ceph_zero_page_vector_range(page_off + read, |
334 | pos - off - read, pages); | |
124e68e7 SW |
335 | } |
336 | pos += ret; | |
337 | read = pos - off; | |
338 | left -= ret; | |
339 | page_pos += didpages; | |
340 | pages_left -= didpages; | |
341 | ||
342 | /* hit stripe? */ | |
343 | if (left && hit_stripe) | |
344 | goto more; | |
345 | } | |
346 | ||
347 | if (was_short) { | |
348 | /* was original extent fully inside i_size? */ | |
349 | if (pos + left <= inode->i_size) { | |
350 | dout("zero tail\n"); | |
3d14c5d2 YS |
351 | ceph_zero_page_vector_range(page_off + read, len - read, |
352 | pages); | |
972f0d3a | 353 | read = len; |
124e68e7 SW |
354 | goto out; |
355 | } | |
356 | ||
357 | /* check i_size */ | |
6a026589 | 358 | *checkeof = 1; |
124e68e7 SW |
359 | } |
360 | ||
361 | out: | |
362 | if (ret >= 0) | |
363 | ret = read; | |
364 | dout("striped_read returns %d\n", ret); | |
365 | return ret; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Completely synchronous read and write methods. Direct from __user | |
370 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
371 | * | |
372 | * If the read spans object boundary, just do multiple reads. | |
373 | */ | |
374 | static ssize_t ceph_sync_read(struct file *file, char __user *data, | |
6a026589 | 375 | unsigned len, loff_t *poff, int *checkeof) |
124e68e7 SW |
376 | { |
377 | struct inode *inode = file->f_dentry->d_inode; | |
378 | struct page **pages; | |
379 | u64 off = *poff; | |
ab226e21 | 380 | int num_pages, ret; |
124e68e7 SW |
381 | |
382 | dout("sync_read on file %p %llu~%u %s\n", file, off, len, | |
383 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); | |
384 | ||
ab226e21 HC |
385 | if (file->f_flags & O_DIRECT) { |
386 | num_pages = calc_pages_for((unsigned long)data, len); | |
b6aa5901 | 387 | pages = ceph_get_direct_page_vector(data, num_pages, true); |
ab226e21 HC |
388 | } else { |
389 | num_pages = calc_pages_for(off, len); | |
34d23762 | 390 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
ab226e21 | 391 | } |
124e68e7 SW |
392 | if (IS_ERR(pages)) |
393 | return PTR_ERR(pages); | |
394 | ||
e98b6fed SW |
395 | /* |
396 | * flush any page cache pages in this range. this | |
397 | * will make concurrent normal and sync io slow, | |
398 | * but it will at least behave sensibly when they are | |
399 | * in sequence. | |
400 | */ | |
29065a51 YS |
401 | ret = filemap_write_and_wait(inode->i_mapping); |
402 | if (ret < 0) | |
403 | goto done; | |
404 | ||
b7495fc2 | 405 | ret = striped_read(inode, off, len, pages, num_pages, checkeof, |
ab226e21 HC |
406 | file->f_flags & O_DIRECT, |
407 | (unsigned long)data & ~PAGE_MASK); | |
124e68e7 SW |
408 | |
409 | if (ret >= 0 && (file->f_flags & O_DIRECT) == 0) | |
3d14c5d2 | 410 | ret = ceph_copy_page_vector_to_user(pages, data, off, ret); |
124e68e7 SW |
411 | if (ret >= 0) |
412 | *poff = off + ret; | |
413 | ||
29065a51 | 414 | done: |
124e68e7 | 415 | if (file->f_flags & O_DIRECT) |
b6aa5901 | 416 | ceph_put_page_vector(pages, num_pages, true); |
124e68e7 SW |
417 | else |
418 | ceph_release_page_vector(pages, num_pages); | |
419 | dout("sync_read result %d\n", ret); | |
420 | return ret; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Write commit callback, called if we requested both an ACK and | |
425 | * ONDISK commit reply from the OSD. | |
426 | */ | |
427 | static void sync_write_commit(struct ceph_osd_request *req, | |
428 | struct ceph_msg *msg) | |
429 | { | |
430 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
431 | ||
432 | dout("sync_write_commit %p tid %llu\n", req, req->r_tid); | |
433 | spin_lock(&ci->i_unsafe_lock); | |
434 | list_del_init(&req->r_unsafe_item); | |
435 | spin_unlock(&ci->i_unsafe_lock); | |
436 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
437 | } | |
438 | ||
439 | /* | |
440 | * Synchronous write, straight from __user pointer or user pages (if | |
441 | * O_DIRECT). | |
442 | * | |
443 | * If write spans object boundary, just do multiple writes. (For a | |
444 | * correct atomic write, we should e.g. take write locks on all | |
445 | * objects, rollback on failure, etc.) | |
446 | */ | |
447 | static ssize_t ceph_sync_write(struct file *file, const char __user *data, | |
448 | size_t left, loff_t *offset) | |
449 | { | |
450 | struct inode *inode = file->f_dentry->d_inode; | |
451 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 | 452 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 SW |
453 | struct ceph_osd_request *req; |
454 | struct page **pages; | |
455 | int num_pages; | |
456 | long long unsigned pos; | |
457 | u64 len; | |
458 | int written = 0; | |
459 | int flags; | |
460 | int do_sync = 0; | |
461 | int check_caps = 0; | |
b7495fc2 | 462 | int page_align, io_align; |
ab226e21 | 463 | unsigned long buf_align; |
124e68e7 SW |
464 | int ret; |
465 | struct timespec mtime = CURRENT_TIME; | |
466 | ||
467 | if (ceph_snap(file->f_dentry->d_inode) != CEPH_NOSNAP) | |
468 | return -EROFS; | |
469 | ||
470 | dout("sync_write on file %p %lld~%u %s\n", file, *offset, | |
471 | (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); | |
472 | ||
473 | if (file->f_flags & O_APPEND) | |
474 | pos = i_size_read(inode); | |
475 | else | |
476 | pos = *offset; | |
477 | ||
b7495fc2 | 478 | io_align = pos & ~PAGE_MASK; |
ab226e21 | 479 | buf_align = (unsigned long)data & ~PAGE_MASK; |
b7495fc2 | 480 | |
29065a51 YS |
481 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left); |
482 | if (ret < 0) | |
483 | return ret; | |
484 | ||
485 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
486 | pos >> PAGE_CACHE_SHIFT, | |
487 | (pos + left) >> PAGE_CACHE_SHIFT); | |
488 | if (ret < 0) | |
489 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
490 | ||
124e68e7 SW |
491 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
492 | CEPH_OSD_FLAG_ONDISK | | |
493 | CEPH_OSD_FLAG_WRITE; | |
494 | if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0) | |
495 | flags |= CEPH_OSD_FLAG_ACK; | |
496 | else | |
497 | do_sync = 1; | |
498 | ||
499 | /* | |
500 | * we may need to do multiple writes here if we span an object | |
501 | * boundary. this isn't atomic, unfortunately. :( | |
502 | */ | |
503 | more: | |
504 | len = left; | |
ab226e21 | 505 | if (file->f_flags & O_DIRECT) { |
b7495fc2 SW |
506 | /* write from beginning of first page, regardless of |
507 | io alignment */ | |
ab226e21 HC |
508 | page_align = (pos - io_align + buf_align) & ~PAGE_MASK; |
509 | num_pages = calc_pages_for((unsigned long)data, len); | |
510 | } else { | |
b7495fc2 | 511 | page_align = pos & ~PAGE_MASK; |
ab226e21 HC |
512 | num_pages = calc_pages_for(pos, len); |
513 | } | |
3d14c5d2 | 514 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
124e68e7 SW |
515 | ceph_vino(inode), pos, &len, |
516 | CEPH_OSD_OP_WRITE, flags, | |
517 | ci->i_snap_realm->cached_context, | |
518 | do_sync, | |
519 | ci->i_truncate_seq, ci->i_truncate_size, | |
b7495fc2 | 520 | &mtime, false, 2, page_align); |
a79832f2 SW |
521 | if (!req) |
522 | return -ENOMEM; | |
124e68e7 | 523 | |
124e68e7 | 524 | if (file->f_flags & O_DIRECT) { |
b6aa5901 | 525 | pages = ceph_get_direct_page_vector(data, num_pages, false); |
124e68e7 SW |
526 | if (IS_ERR(pages)) { |
527 | ret = PTR_ERR(pages); | |
528 | goto out; | |
529 | } | |
530 | ||
531 | /* | |
532 | * throw out any page cache pages in this range. this | |
533 | * may block. | |
534 | */ | |
213c99ee | 535 | truncate_inode_pages_range(inode->i_mapping, pos, |
5c6a2cdb | 536 | (pos+len) | (PAGE_CACHE_SIZE-1)); |
124e68e7 | 537 | } else { |
34d23762 | 538 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
124e68e7 SW |
539 | if (IS_ERR(pages)) { |
540 | ret = PTR_ERR(pages); | |
541 | goto out; | |
542 | } | |
3d14c5d2 | 543 | ret = ceph_copy_user_to_page_vector(pages, data, pos, len); |
124e68e7 SW |
544 | if (ret < 0) { |
545 | ceph_release_page_vector(pages, num_pages); | |
546 | goto out; | |
547 | } | |
548 | ||
549 | if ((file->f_flags & O_SYNC) == 0) { | |
550 | /* get a second commit callback */ | |
551 | req->r_safe_callback = sync_write_commit; | |
552 | req->r_own_pages = 1; | |
553 | } | |
554 | } | |
555 | req->r_pages = pages; | |
556 | req->r_num_pages = num_pages; | |
557 | req->r_inode = inode; | |
558 | ||
3d14c5d2 | 559 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
124e68e7 SW |
560 | if (!ret) { |
561 | if (req->r_safe_callback) { | |
562 | /* | |
563 | * Add to inode unsafe list only after we | |
564 | * start_request so that a tid has been assigned. | |
565 | */ | |
566 | spin_lock(&ci->i_unsafe_lock); | |
49bcb932 HC |
567 | list_add_tail(&req->r_unsafe_item, |
568 | &ci->i_unsafe_writes); | |
124e68e7 SW |
569 | spin_unlock(&ci->i_unsafe_lock); |
570 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
571 | } | |
78a25565 | 572 | |
3d14c5d2 | 573 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); |
78a25565 HC |
574 | if (ret < 0 && req->r_safe_callback) { |
575 | spin_lock(&ci->i_unsafe_lock); | |
576 | list_del_init(&req->r_unsafe_item); | |
577 | spin_unlock(&ci->i_unsafe_lock); | |
578 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
579 | } | |
124e68e7 SW |
580 | } |
581 | ||
582 | if (file->f_flags & O_DIRECT) | |
b6aa5901 | 583 | ceph_put_page_vector(pages, num_pages, false); |
124e68e7 SW |
584 | else if (file->f_flags & O_SYNC) |
585 | ceph_release_page_vector(pages, num_pages); | |
586 | ||
587 | out: | |
588 | ceph_osdc_put_request(req); | |
589 | if (ret == 0) { | |
590 | pos += len; | |
591 | written += len; | |
592 | left -= len; | |
593 | if (left) | |
594 | goto more; | |
595 | ||
596 | ret = written; | |
597 | *offset = pos; | |
598 | if (pos > i_size_read(inode)) | |
599 | check_caps = ceph_inode_set_size(inode, pos); | |
600 | if (check_caps) | |
601 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, | |
602 | NULL); | |
603 | } | |
604 | return ret; | |
605 | } | |
606 | ||
607 | /* | |
608 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
609 | * Atomically grab references, so that those bits are not released | |
610 | * back to the MDS mid-read. | |
611 | * | |
612 | * Hmm, the sync read case isn't actually async... should it be? | |
613 | */ | |
614 | static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
615 | unsigned long nr_segs, loff_t pos) | |
616 | { | |
617 | struct file *filp = iocb->ki_filp; | |
2962507c | 618 | struct ceph_file_info *fi = filp->private_data; |
124e68e7 SW |
619 | loff_t *ppos = &iocb->ki_pos; |
620 | size_t len = iov->iov_len; | |
621 | struct inode *inode = filp->f_dentry->d_inode; | |
622 | struct ceph_inode_info *ci = ceph_inode(inode); | |
cd84db6e | 623 | void __user *base = iov->iov_base; |
124e68e7 | 624 | ssize_t ret; |
2962507c | 625 | int want, got = 0; |
6a026589 | 626 | int checkeof = 0, read = 0; |
124e68e7 SW |
627 | |
628 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", | |
629 | inode, ceph_vinop(inode), pos, (unsigned)len, inode); | |
6a026589 | 630 | again: |
124e68e7 | 631 | __ceph_do_pending_vmtruncate(inode); |
2962507c SW |
632 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
633 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
634 | else | |
635 | want = CEPH_CAP_FILE_CACHE; | |
636 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); | |
124e68e7 SW |
637 | if (ret < 0) |
638 | goto out; | |
639 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
640 | inode, ceph_vinop(inode), pos, (unsigned)len, | |
641 | ceph_cap_string(got)); | |
642 | ||
2962507c | 643 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
124e68e7 SW |
644 | (iocb->ki_filp->f_flags & O_DIRECT) || |
645 | (inode->i_sb->s_flags & MS_SYNCHRONOUS)) | |
646 | /* hmm, this isn't really async... */ | |
6a026589 | 647 | ret = ceph_sync_read(filp, base, len, ppos, &checkeof); |
124e68e7 SW |
648 | else |
649 | ret = generic_file_aio_read(iocb, iov, nr_segs, pos); | |
650 | ||
651 | out: | |
652 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", | |
653 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
654 | ceph_put_cap_refs(ci, got); | |
6a026589 SW |
655 | |
656 | if (checkeof && ret >= 0) { | |
657 | int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); | |
658 | ||
659 | /* hit EOF or hole? */ | |
660 | if (statret == 0 && *ppos < inode->i_size) { | |
661 | dout("aio_read sync_read hit hole, reading more\n"); | |
662 | read += ret; | |
663 | base += ret; | |
664 | len -= ret; | |
665 | checkeof = 0; | |
666 | goto again; | |
667 | } | |
668 | } | |
669 | if (ret >= 0) | |
670 | ret += read; | |
671 | ||
124e68e7 SW |
672 | return ret; |
673 | } | |
674 | ||
675 | /* | |
676 | * Take cap references to avoid releasing caps to MDS mid-write. | |
677 | * | |
678 | * If we are synchronous, and write with an old snap context, the OSD | |
679 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
680 | * dropping our cap refs and allowing the pending snap to logically | |
681 | * complete _before_ this write occurs. | |
682 | * | |
683 | * If we are near ENOSPC, write synchronously. | |
684 | */ | |
685 | static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
686 | unsigned long nr_segs, loff_t pos) | |
687 | { | |
688 | struct file *file = iocb->ki_filp; | |
33caad32 | 689 | struct ceph_file_info *fi = file->private_data; |
124e68e7 SW |
690 | struct inode *inode = file->f_dentry->d_inode; |
691 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 YS |
692 | struct ceph_osd_client *osdc = |
693 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
124e68e7 | 694 | loff_t endoff = pos + iov->iov_len; |
33caad32 | 695 | int want, got = 0; |
88d892a3 | 696 | int ret, err; |
124e68e7 SW |
697 | |
698 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
699 | return -EROFS; | |
700 | ||
701 | retry_snap: | |
702 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) | |
703 | return -ENOSPC; | |
704 | __ceph_do_pending_vmtruncate(inode); | |
705 | dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n", | |
706 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, | |
707 | inode->i_size); | |
33caad32 SW |
708 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
709 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
710 | else | |
711 | want = CEPH_CAP_FILE_BUFFER; | |
712 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff); | |
124e68e7 SW |
713 | if (ret < 0) |
714 | goto out; | |
715 | ||
716 | dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n", | |
717 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, | |
718 | ceph_cap_string(got)); | |
719 | ||
33caad32 | 720 | if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || |
124e68e7 SW |
721 | (iocb->ki_filp->f_flags & O_DIRECT) || |
722 | (inode->i_sb->s_flags & MS_SYNCHRONOUS)) { | |
723 | ret = ceph_sync_write(file, iov->iov_base, iov->iov_len, | |
724 | &iocb->ki_pos); | |
725 | } else { | |
726 | ret = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
727 | ||
728 | if ((ret >= 0 || ret == -EIOCBQUEUED) && | |
729 | ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) | |
88d892a3 | 730 | || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { |
8018ab05 | 731 | err = vfs_fsync_range(file, pos, pos + ret - 1, 1); |
88d892a3 YS |
732 | if (err < 0) |
733 | ret = err; | |
734 | } | |
124e68e7 SW |
735 | } |
736 | if (ret >= 0) { | |
737 | spin_lock(&inode->i_lock); | |
738 | __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); | |
739 | spin_unlock(&inode->i_lock); | |
740 | } | |
741 | ||
742 | out: | |
743 | dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", | |
744 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, | |
745 | ceph_cap_string(got)); | |
746 | ceph_put_cap_refs(ci, got); | |
747 | ||
748 | if (ret == -EOLDSNAPC) { | |
749 | dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n", | |
750 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len); | |
751 | goto retry_snap; | |
752 | } | |
753 | ||
754 | return ret; | |
755 | } | |
756 | ||
757 | /* | |
758 | * llseek. be sure to verify file size on SEEK_END. | |
759 | */ | |
760 | static loff_t ceph_llseek(struct file *file, loff_t offset, int origin) | |
761 | { | |
762 | struct inode *inode = file->f_mapping->host; | |
763 | int ret; | |
764 | ||
765 | mutex_lock(&inode->i_mutex); | |
766 | __ceph_do_pending_vmtruncate(inode); | |
767 | switch (origin) { | |
768 | case SEEK_END: | |
769 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); | |
770 | if (ret < 0) { | |
771 | offset = ret; | |
772 | goto out; | |
773 | } | |
774 | offset += inode->i_size; | |
775 | break; | |
776 | case SEEK_CUR: | |
777 | /* | |
778 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
779 | * position-querying operation. Avoid rewriting the "same" | |
780 | * f_pos value back to the file because a concurrent read(), | |
781 | * write() or lseek() might have altered it | |
782 | */ | |
783 | if (offset == 0) { | |
784 | offset = file->f_pos; | |
785 | goto out; | |
786 | } | |
787 | offset += file->f_pos; | |
788 | break; | |
789 | } | |
790 | ||
791 | if (offset < 0 || offset > inode->i_sb->s_maxbytes) { | |
792 | offset = -EINVAL; | |
793 | goto out; | |
794 | } | |
795 | ||
796 | /* Special lock needed here? */ | |
797 | if (offset != file->f_pos) { | |
798 | file->f_pos = offset; | |
799 | file->f_version = 0; | |
800 | } | |
801 | ||
802 | out: | |
803 | mutex_unlock(&inode->i_mutex); | |
804 | return offset; | |
805 | } | |
806 | ||
807 | const struct file_operations ceph_file_fops = { | |
808 | .open = ceph_open, | |
809 | .release = ceph_release, | |
810 | .llseek = ceph_llseek, | |
811 | .read = do_sync_read, | |
812 | .write = do_sync_write, | |
813 | .aio_read = ceph_aio_read, | |
814 | .aio_write = ceph_aio_write, | |
815 | .mmap = ceph_mmap, | |
816 | .fsync = ceph_fsync, | |
40819f6f GF |
817 | .lock = ceph_lock, |
818 | .flock = ceph_flock, | |
124e68e7 SW |
819 | .splice_read = generic_file_splice_read, |
820 | .splice_write = generic_file_splice_write, | |
821 | .unlocked_ioctl = ceph_ioctl, | |
822 | .compat_ioctl = ceph_ioctl, | |
823 | }; | |
824 |