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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 | 6 | #include <linux/file.h> |
5ef50c3b | 7 | #include <linux/mount.h> |
124e68e7 SW |
8 | #include <linux/namei.h> |
9 | #include <linux/writeback.h> | |
ad7a60de | 10 | #include <linux/falloc.h> |
124e68e7 SW |
11 | |
12 | #include "super.h" | |
13 | #include "mds_client.h" | |
99ccbd22 | 14 | #include "cache.h" |
124e68e7 SW |
15 | |
16 | /* | |
17 | * Ceph file operations | |
18 | * | |
19 | * Implement basic open/close functionality, and implement | |
20 | * read/write. | |
21 | * | |
22 | * We implement three modes of file I/O: | |
23 | * - buffered uses the generic_file_aio_{read,write} helpers | |
24 | * | |
25 | * - synchronous is used when there is multi-client read/write | |
26 | * sharing, avoids the page cache, and synchronously waits for an | |
27 | * ack from the OSD. | |
28 | * | |
29 | * - direct io takes the variant of the sync path that references | |
30 | * user pages directly. | |
31 | * | |
32 | * fsync() flushes and waits on dirty pages, but just queues metadata | |
33 | * for writeback: since the MDS can recover size and mtime there is no | |
34 | * need to wait for MDS acknowledgement. | |
35 | */ | |
36 | ||
b5b98989 ZC |
37 | /* |
38 | * Calculate the length sum of direct io vectors that can | |
39 | * be combined into one page vector. | |
40 | */ | |
41 | static size_t dio_get_pagev_size(const struct iov_iter *it) | |
42 | { | |
43 | const struct iovec *iov = it->iov; | |
44 | const struct iovec *iovend = iov + it->nr_segs; | |
45 | size_t size; | |
46 | ||
47 | size = iov->iov_len - it->iov_offset; | |
48 | /* | |
49 | * An iov can be page vectored when both the current tail | |
50 | * and the next base are page aligned. | |
51 | */ | |
52 | while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) && | |
53 | (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) { | |
54 | size += iov->iov_len; | |
55 | } | |
56 | dout("dio_get_pagevlen len = %zu\n", size); | |
57 | return size; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Allocate a page vector based on (@it, @nbytes). | |
62 | * The return value is the tuple describing a page vector, | |
63 | * that is (@pages, @page_align, @num_pages). | |
64 | */ | |
65 | static struct page ** | |
66 | dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes, | |
67 | size_t *page_align, int *num_pages) | |
68 | { | |
69 | struct iov_iter tmp_it = *it; | |
70 | size_t align; | |
71 | struct page **pages; | |
72 | int ret = 0, idx, npages; | |
73 | ||
74 | align = (unsigned long)(it->iov->iov_base + it->iov_offset) & | |
75 | (PAGE_SIZE - 1); | |
76 | npages = calc_pages_for(align, nbytes); | |
77 | pages = kmalloc(sizeof(*pages) * npages, GFP_KERNEL); | |
78 | if (!pages) { | |
79 | pages = vmalloc(sizeof(*pages) * npages); | |
80 | if (!pages) | |
81 | return ERR_PTR(-ENOMEM); | |
82 | } | |
83 | ||
84 | for (idx = 0; idx < npages; ) { | |
85 | size_t start; | |
86 | ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes, | |
87 | npages - idx, &start); | |
88 | if (ret < 0) | |
89 | goto fail; | |
90 | ||
91 | iov_iter_advance(&tmp_it, ret); | |
92 | nbytes -= ret; | |
93 | idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE; | |
94 | } | |
95 | ||
96 | BUG_ON(nbytes != 0); | |
97 | *num_pages = npages; | |
98 | *page_align = align; | |
99 | dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align); | |
100 | return pages; | |
101 | fail: | |
102 | ceph_put_page_vector(pages, idx, false); | |
103 | return ERR_PTR(ret); | |
104 | } | |
124e68e7 SW |
105 | |
106 | /* | |
107 | * Prepare an open request. Preallocate ceph_cap to avoid an | |
108 | * inopportune ENOMEM later. | |
109 | */ | |
110 | static struct ceph_mds_request * | |
111 | prepare_open_request(struct super_block *sb, int flags, int create_mode) | |
112 | { | |
3d14c5d2 YS |
113 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
114 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
115 | struct ceph_mds_request *req; |
116 | int want_auth = USE_ANY_MDS; | |
117 | int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; | |
118 | ||
119 | if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) | |
120 | want_auth = USE_AUTH_MDS; | |
121 | ||
122 | req = ceph_mdsc_create_request(mdsc, op, want_auth); | |
123 | if (IS_ERR(req)) | |
124 | goto out; | |
125 | req->r_fmode = ceph_flags_to_mode(flags); | |
126 | req->r_args.open.flags = cpu_to_le32(flags); | |
127 | req->r_args.open.mode = cpu_to_le32(create_mode); | |
124e68e7 SW |
128 | out: |
129 | return req; | |
130 | } | |
131 | ||
132 | /* | |
133 | * initialize private struct file data. | |
134 | * if we fail, clean up by dropping fmode reference on the ceph_inode | |
135 | */ | |
136 | static int ceph_init_file(struct inode *inode, struct file *file, int fmode) | |
137 | { | |
138 | struct ceph_file_info *cf; | |
139 | int ret = 0; | |
140 | ||
141 | switch (inode->i_mode & S_IFMT) { | |
142 | case S_IFREG: | |
46b59b2b YZ |
143 | ceph_fscache_register_inode_cookie(inode); |
144 | ceph_fscache_file_set_cookie(inode, file); | |
124e68e7 SW |
145 | case S_IFDIR: |
146 | dout("init_file %p %p 0%o (regular)\n", inode, file, | |
147 | inode->i_mode); | |
99ec2697 | 148 | cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL); |
124e68e7 SW |
149 | if (cf == NULL) { |
150 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
151 | return -ENOMEM; | |
152 | } | |
153 | cf->fmode = fmode; | |
154 | cf->next_offset = 2; | |
fdd4e158 | 155 | cf->readdir_cache_idx = -1; |
124e68e7 SW |
156 | file->private_data = cf; |
157 | BUG_ON(inode->i_fop->release != ceph_release); | |
158 | break; | |
159 | ||
160 | case S_IFLNK: | |
161 | dout("init_file %p %p 0%o (symlink)\n", inode, file, | |
162 | inode->i_mode); | |
163 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
164 | break; | |
165 | ||
166 | default: | |
167 | dout("init_file %p %p 0%o (special)\n", inode, file, | |
168 | inode->i_mode); | |
169 | /* | |
170 | * we need to drop the open ref now, since we don't | |
171 | * have .release set to ceph_release. | |
172 | */ | |
173 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
174 | BUG_ON(inode->i_fop->release == ceph_release); | |
175 | ||
176 | /* call the proper open fop */ | |
177 | ret = inode->i_fop->open(inode, file); | |
178 | } | |
179 | return ret; | |
180 | } | |
181 | ||
77310320 YZ |
182 | /* |
183 | * try renew caps after session gets killed. | |
184 | */ | |
185 | int ceph_renew_caps(struct inode *inode) | |
186 | { | |
187 | struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; | |
188 | struct ceph_inode_info *ci = ceph_inode(inode); | |
189 | struct ceph_mds_request *req; | |
190 | int err, flags, wanted; | |
191 | ||
192 | spin_lock(&ci->i_ceph_lock); | |
193 | wanted = __ceph_caps_file_wanted(ci); | |
194 | if (__ceph_is_any_real_caps(ci) && | |
195 | (!(wanted & CEPH_CAP_ANY_WR) == 0 || ci->i_auth_cap)) { | |
196 | int issued = __ceph_caps_issued(ci, NULL); | |
197 | spin_unlock(&ci->i_ceph_lock); | |
198 | dout("renew caps %p want %s issued %s updating mds_wanted\n", | |
199 | inode, ceph_cap_string(wanted), ceph_cap_string(issued)); | |
200 | ceph_check_caps(ci, 0, NULL); | |
201 | return 0; | |
202 | } | |
203 | spin_unlock(&ci->i_ceph_lock); | |
204 | ||
205 | flags = 0; | |
206 | if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR)) | |
207 | flags = O_RDWR; | |
208 | else if (wanted & CEPH_CAP_FILE_RD) | |
209 | flags = O_RDONLY; | |
210 | else if (wanted & CEPH_CAP_FILE_WR) | |
211 | flags = O_WRONLY; | |
212 | #ifdef O_LAZY | |
213 | if (wanted & CEPH_CAP_FILE_LAZYIO) | |
214 | flags |= O_LAZY; | |
215 | #endif | |
216 | ||
217 | req = prepare_open_request(inode->i_sb, flags, 0); | |
218 | if (IS_ERR(req)) { | |
219 | err = PTR_ERR(req); | |
220 | goto out; | |
221 | } | |
222 | ||
223 | req->r_inode = inode; | |
224 | ihold(inode); | |
225 | req->r_num_caps = 1; | |
226 | req->r_fmode = -1; | |
227 | ||
228 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
229 | ceph_mdsc_put_request(req); | |
230 | out: | |
231 | dout("renew caps %p open result=%d\n", inode, err); | |
232 | return err < 0 ? err : 0; | |
233 | } | |
234 | ||
124e68e7 | 235 | /* |
124e68e7 SW |
236 | * If we already have the requisite capabilities, we can satisfy |
237 | * the open request locally (no need to request new caps from the | |
238 | * MDS). We do, however, need to inform the MDS (asynchronously) | |
239 | * if our wanted caps set expands. | |
240 | */ | |
241 | int ceph_open(struct inode *inode, struct file *file) | |
242 | { | |
243 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 YS |
244 | struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); |
245 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
246 | struct ceph_mds_request *req; |
247 | struct ceph_file_info *cf = file->private_data; | |
124e68e7 SW |
248 | int err; |
249 | int flags, fmode, wanted; | |
250 | ||
251 | if (cf) { | |
252 | dout("open file %p is already opened\n", file); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ | |
257 | flags = file->f_flags & ~(O_CREAT|O_EXCL); | |
258 | if (S_ISDIR(inode->i_mode)) | |
259 | flags = O_DIRECTORY; /* mds likes to know */ | |
260 | ||
261 | dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, | |
262 | ceph_vinop(inode), file, flags, file->f_flags); | |
263 | fmode = ceph_flags_to_mode(flags); | |
264 | wanted = ceph_caps_for_mode(fmode); | |
265 | ||
266 | /* snapped files are read-only */ | |
267 | if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) | |
268 | return -EROFS; | |
269 | ||
270 | /* trivially open snapdir */ | |
271 | if (ceph_snap(inode) == CEPH_SNAPDIR) { | |
be655596 | 272 | spin_lock(&ci->i_ceph_lock); |
124e68e7 | 273 | __ceph_get_fmode(ci, fmode); |
be655596 | 274 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
275 | return ceph_init_file(inode, file, fmode); |
276 | } | |
277 | ||
278 | /* | |
7421ab80 SW |
279 | * No need to block if we have caps on the auth MDS (for |
280 | * write) or any MDS (for read). Update wanted set | |
124e68e7 SW |
281 | * asynchronously. |
282 | */ | |
be655596 | 283 | spin_lock(&ci->i_ceph_lock); |
7421ab80 SW |
284 | if (__ceph_is_any_real_caps(ci) && |
285 | (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { | |
124e68e7 SW |
286 | int mds_wanted = __ceph_caps_mds_wanted(ci); |
287 | int issued = __ceph_caps_issued(ci, NULL); | |
288 | ||
289 | dout("open %p fmode %d want %s issued %s using existing\n", | |
290 | inode, fmode, ceph_cap_string(wanted), | |
291 | ceph_cap_string(issued)); | |
292 | __ceph_get_fmode(ci, fmode); | |
be655596 | 293 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
294 | |
295 | /* adjust wanted? */ | |
296 | if ((issued & wanted) != wanted && | |
297 | (mds_wanted & wanted) != wanted && | |
298 | ceph_snap(inode) != CEPH_SNAPDIR) | |
299 | ceph_check_caps(ci, 0, NULL); | |
300 | ||
301 | return ceph_init_file(inode, file, fmode); | |
302 | } else if (ceph_snap(inode) != CEPH_NOSNAP && | |
303 | (ci->i_snap_caps & wanted) == wanted) { | |
304 | __ceph_get_fmode(ci, fmode); | |
be655596 | 305 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
306 | return ceph_init_file(inode, file, fmode); |
307 | } | |
99ccbd22 | 308 | |
be655596 | 309 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
310 | |
311 | dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); | |
312 | req = prepare_open_request(inode->i_sb, flags, 0); | |
313 | if (IS_ERR(req)) { | |
314 | err = PTR_ERR(req); | |
315 | goto out; | |
316 | } | |
70b666c3 SW |
317 | req->r_inode = inode; |
318 | ihold(inode); | |
99ccbd22 | 319 | |
124e68e7 | 320 | req->r_num_caps = 1; |
e36d571d | 321 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
124e68e7 SW |
322 | if (!err) |
323 | err = ceph_init_file(inode, file, req->r_fmode); | |
324 | ceph_mdsc_put_request(req); | |
325 | dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); | |
326 | out: | |
327 | return err; | |
328 | } | |
329 | ||
330 | ||
331 | /* | |
5ef50c3b SW |
332 | * Do a lookup + open with a single request. If we get a non-existent |
333 | * file or symlink, return 1 so the VFS can retry. | |
124e68e7 | 334 | */ |
5ef50c3b | 335 | int ceph_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 336 | struct file *file, unsigned flags, umode_t mode, |
d9585277 | 337 | int *opened) |
124e68e7 | 338 | { |
3d14c5d2 YS |
339 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
340 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 | 341 | struct ceph_mds_request *req; |
5ef50c3b | 342 | struct dentry *dn; |
b1ee94aa | 343 | struct ceph_acls_info acls = {}; |
315f2408 | 344 | int mask; |
124e68e7 | 345 | int err; |
124e68e7 | 346 | |
a455589f AV |
347 | dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", |
348 | dir, dentry, dentry, | |
5ef50c3b SW |
349 | d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); |
350 | ||
351 | if (dentry->d_name.len > NAME_MAX) | |
352 | return -ENAMETOOLONG; | |
353 | ||
354 | err = ceph_init_dentry(dentry); | |
355 | if (err < 0) | |
356 | return err; | |
124e68e7 | 357 | |
b1ee94aa YZ |
358 | if (flags & O_CREAT) { |
359 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
360 | if (err < 0) | |
361 | return err; | |
362 | } | |
363 | ||
124e68e7 SW |
364 | /* do the open */ |
365 | req = prepare_open_request(dir->i_sb, flags, mode); | |
b1ee94aa YZ |
366 | if (IS_ERR(req)) { |
367 | err = PTR_ERR(req); | |
368 | goto out_acl; | |
369 | } | |
124e68e7 SW |
370 | req->r_dentry = dget(dentry); |
371 | req->r_num_caps = 2; | |
372 | if (flags & O_CREAT) { | |
373 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
374 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
375 | if (acls.pagelist) { |
376 | req->r_pagelist = acls.pagelist; | |
377 | acls.pagelist = NULL; | |
378 | } | |
124e68e7 | 379 | } |
315f2408 YZ |
380 | |
381 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
382 | if (ceph_security_xattr_wanted(dir)) | |
383 | mask |= CEPH_CAP_XATTR_SHARED; | |
384 | req->r_args.open.mask = cpu_to_le32(mask); | |
385 | ||
124e68e7 | 386 | req->r_locked_dir = dir; /* caller holds dir->i_mutex */ |
acda7657 SW |
387 | err = ceph_mdsc_do_request(mdsc, |
388 | (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, | |
389 | req); | |
bf91c315 | 390 | err = ceph_handle_snapdir(req, dentry, err); |
79aec984 | 391 | if (err) |
b1ee94aa | 392 | goto out_req; |
79aec984 | 393 | |
a43137f7 | 394 | if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry) |
124e68e7 | 395 | err = ceph_handle_notrace_create(dir, dentry); |
2d83bde9 | 396 | |
00699ad8 | 397 | if (d_in_lookup(dentry)) { |
5ef50c3b SW |
398 | dn = ceph_finish_lookup(req, dentry, err); |
399 | if (IS_ERR(dn)) | |
400 | err = PTR_ERR(dn); | |
401 | } else { | |
402 | /* we were given a hashed negative dentry */ | |
403 | dn = NULL; | |
404 | } | |
405 | if (err) | |
b1ee94aa | 406 | goto out_req; |
2b0143b5 | 407 | if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) { |
5ef50c3b SW |
408 | /* make vfs retry on splice, ENOENT, or symlink */ |
409 | dout("atomic_open finish_no_open on dn %p\n", dn); | |
410 | err = finish_no_open(file, dn); | |
411 | } else { | |
412 | dout("atomic_open finish_open on dn %p\n", dn); | |
6e8575fa | 413 | if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { |
2b0143b5 | 414 | ceph_init_inode_acls(d_inode(dentry), &acls); |
6e8575fa SL |
415 | *opened |= FILE_CREATED; |
416 | } | |
5ef50c3b SW |
417 | err = finish_open(file, dentry, ceph_open, opened); |
418 | } | |
b1ee94aa | 419 | out_req: |
ab866549 YZ |
420 | if (!req->r_err && req->r_target_inode) |
421 | ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); | |
5ef50c3b | 422 | ceph_mdsc_put_request(req); |
b1ee94aa YZ |
423 | out_acl: |
424 | ceph_release_acls_info(&acls); | |
5ef50c3b | 425 | dout("atomic_open result=%d\n", err); |
d9585277 | 426 | return err; |
124e68e7 SW |
427 | } |
428 | ||
429 | int ceph_release(struct inode *inode, struct file *file) | |
430 | { | |
431 | struct ceph_inode_info *ci = ceph_inode(inode); | |
432 | struct ceph_file_info *cf = file->private_data; | |
433 | ||
434 | dout("release inode %p file %p\n", inode, file); | |
435 | ceph_put_fmode(ci, cf->fmode); | |
436 | if (cf->last_readdir) | |
437 | ceph_mdsc_put_request(cf->last_readdir); | |
438 | kfree(cf->last_name); | |
439 | kfree(cf->dir_info); | |
124e68e7 | 440 | kmem_cache_free(ceph_file_cachep, cf); |
195d3ce2 SW |
441 | |
442 | /* wake up anyone waiting for caps on this inode */ | |
03066f23 | 443 | wake_up_all(&ci->i_cap_wq); |
124e68e7 SW |
444 | return 0; |
445 | } | |
446 | ||
83701246 | 447 | enum { |
c8fe9b17 YZ |
448 | HAVE_RETRIED = 1, |
449 | CHECK_EOF = 2, | |
450 | READ_INLINE = 3, | |
83701246 YZ |
451 | }; |
452 | ||
124e68e7 SW |
453 | /* |
454 | * Read a range of bytes striped over one or more objects. Iterate over | |
455 | * objects we stripe over. (That's not atomic, but good enough for now.) | |
456 | * | |
457 | * If we get a short result from the OSD, check against i_size; we need to | |
458 | * only return a short read to the caller if we hit EOF. | |
459 | */ | |
460 | static int striped_read(struct inode *inode, | |
461 | u64 off, u64 len, | |
6a026589 | 462 | struct page **pages, int num_pages, |
c8fe9b17 | 463 | int *checkeof) |
124e68e7 | 464 | { |
3d14c5d2 | 465 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 | 466 | struct ceph_inode_info *ci = ceph_inode(inode); |
688bac46 | 467 | u64 pos, this_len, left; |
99c88e69 | 468 | loff_t i_size; |
c8fe9b17 YZ |
469 | int page_align, pages_left; |
470 | int read, ret; | |
124e68e7 | 471 | struct page **page_pos; |
124e68e7 SW |
472 | bool hit_stripe, was_short; |
473 | ||
474 | /* | |
475 | * we may need to do multiple reads. not atomic, unfortunately. | |
476 | */ | |
477 | pos = off; | |
478 | left = len; | |
479 | page_pos = pages; | |
480 | pages_left = num_pages; | |
481 | read = 0; | |
482 | ||
483 | more: | |
c8fe9b17 | 484 | page_align = pos & ~PAGE_MASK; |
124e68e7 | 485 | this_len = left; |
3d14c5d2 | 486 | ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
124e68e7 SW |
487 | &ci->i_layout, pos, &this_len, |
488 | ci->i_truncate_seq, | |
489 | ci->i_truncate_size, | |
b7495fc2 | 490 | page_pos, pages_left, page_align); |
124e68e7 SW |
491 | if (ret == -ENOENT) |
492 | ret = 0; | |
0e98728f SW |
493 | hit_stripe = this_len < left; |
494 | was_short = ret >= 0 && ret < this_len; | |
688bac46 | 495 | dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, |
124e68e7 SW |
496 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); |
497 | ||
99c88e69 | 498 | i_size = i_size_read(inode); |
02ae66d8 | 499 | if (ret >= 0) { |
500 | int didpages; | |
99c88e69 YZ |
501 | if (was_short && (pos + ret < i_size)) { |
502 | int zlen = min(this_len - ret, i_size - pos - ret); | |
c8fe9b17 | 503 | int zoff = (off & ~PAGE_MASK) + read + ret; |
02ae66d8 | 504 | dout(" zero gap %llu to %llu\n", |
1487a688 YZ |
505 | pos + ret, pos + ret + zlen); |
506 | ceph_zero_page_vector_range(zoff, zlen, pages); | |
507 | ret += zlen; | |
124e68e7 | 508 | } |
02ae66d8 | 509 | |
09cbfeaf | 510 | didpages = (page_align + ret) >> PAGE_SHIFT; |
124e68e7 SW |
511 | pos += ret; |
512 | read = pos - off; | |
513 | left -= ret; | |
514 | page_pos += didpages; | |
515 | pages_left -= didpages; | |
516 | ||
02ae66d8 | 517 | /* hit stripe and need continue*/ |
99c88e69 | 518 | if (left && hit_stripe && pos < i_size) |
124e68e7 SW |
519 | goto more; |
520 | } | |
521 | ||
ee7289bf | 522 | if (read > 0) { |
02ae66d8 | 523 | ret = read; |
c3cd6283 | 524 | /* did we bounce off eof? */ |
99c88e69 | 525 | if (pos + left > i_size) |
83701246 | 526 | *checkeof = CHECK_EOF; |
124e68e7 SW |
527 | } |
528 | ||
124e68e7 SW |
529 | dout("striped_read returns %d\n", ret); |
530 | return ret; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Completely synchronous read and write methods. Direct from __user | |
535 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
536 | * | |
537 | * If the read spans object boundary, just do multiple reads. | |
538 | */ | |
8eb4efb0 | 539 | static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i, |
540 | int *checkeof) | |
124e68e7 | 541 | { |
8eb4efb0 | 542 | struct file *file = iocb->ki_filp; |
496ad9aa | 543 | struct inode *inode = file_inode(file); |
124e68e7 | 544 | struct page **pages; |
8eb4efb0 | 545 | u64 off = iocb->ki_pos; |
ab226e21 | 546 | int num_pages, ret; |
2b777c9d | 547 | size_t len = iov_iter_count(i); |
124e68e7 | 548 | |
8eb4efb0 | 549 | dout("sync_read on file %p %llu~%u %s\n", file, off, |
550 | (unsigned)len, | |
124e68e7 | 551 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
d0d0db22 YZ |
552 | |
553 | if (!len) | |
554 | return 0; | |
e98b6fed SW |
555 | /* |
556 | * flush any page cache pages in this range. this | |
557 | * will make concurrent normal and sync io slow, | |
558 | * but it will at least behave sensibly when they are | |
559 | * in sequence. | |
560 | */ | |
8eb4efb0 | 561 | ret = filemap_write_and_wait_range(inode->i_mapping, off, |
562 | off + len); | |
29065a51 | 563 | if (ret < 0) |
8eb4efb0 | 564 | return ret; |
29065a51 | 565 | |
c8fe9b17 YZ |
566 | num_pages = calc_pages_for(off, len); |
567 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
568 | if (IS_ERR(pages)) | |
569 | return PTR_ERR(pages); | |
570 | ret = striped_read(inode, off, len, pages, | |
571 | num_pages, checkeof); | |
572 | if (ret > 0) { | |
573 | int l, k = 0; | |
574 | size_t left = ret; | |
575 | ||
576 | while (left) { | |
577 | size_t page_off = off & ~PAGE_MASK; | |
578 | size_t copy = min_t(size_t, left, | |
579 | PAGE_SIZE - page_off); | |
580 | l = copy_page_to_iter(pages[k++], page_off, copy, i); | |
581 | off += l; | |
582 | left -= l; | |
583 | if (l < copy) | |
8eb4efb0 | 584 | break; |
585 | } | |
8eb4efb0 | 586 | } |
c8fe9b17 | 587 | ceph_release_page_vector(pages, num_pages); |
124e68e7 | 588 | |
8eb4efb0 | 589 | if (off > iocb->ki_pos) { |
590 | ret = off - iocb->ki_pos; | |
591 | iocb->ki_pos = off; | |
592 | } | |
124e68e7 | 593 | |
124e68e7 SW |
594 | dout("sync_read result %d\n", ret); |
595 | return ret; | |
596 | } | |
597 | ||
c8fe9b17 YZ |
598 | struct ceph_aio_request { |
599 | struct kiocb *iocb; | |
600 | size_t total_len; | |
601 | int write; | |
602 | int error; | |
603 | struct list_head osd_reqs; | |
604 | unsigned num_reqs; | |
605 | atomic_t pending_reqs; | |
5be0389d | 606 | struct timespec mtime; |
c8fe9b17 YZ |
607 | struct ceph_cap_flush *prealloc_cf; |
608 | }; | |
609 | ||
5be0389d YZ |
610 | struct ceph_aio_work { |
611 | struct work_struct work; | |
612 | struct ceph_osd_request *req; | |
613 | }; | |
614 | ||
615 | static void ceph_aio_retry_work(struct work_struct *work); | |
616 | ||
c8fe9b17 YZ |
617 | static void ceph_aio_complete(struct inode *inode, |
618 | struct ceph_aio_request *aio_req) | |
619 | { | |
620 | struct ceph_inode_info *ci = ceph_inode(inode); | |
621 | int ret; | |
622 | ||
623 | if (!atomic_dec_and_test(&aio_req->pending_reqs)) | |
624 | return; | |
625 | ||
626 | ret = aio_req->error; | |
627 | if (!ret) | |
628 | ret = aio_req->total_len; | |
629 | ||
630 | dout("ceph_aio_complete %p rc %d\n", inode, ret); | |
631 | ||
632 | if (ret >= 0 && aio_req->write) { | |
633 | int dirty; | |
634 | ||
635 | loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len; | |
636 | if (endoff > i_size_read(inode)) { | |
637 | if (ceph_inode_set_size(inode, endoff)) | |
638 | ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); | |
639 | } | |
640 | ||
641 | spin_lock(&ci->i_ceph_lock); | |
642 | ci->i_inline_version = CEPH_INLINE_NONE; | |
643 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, | |
644 | &aio_req->prealloc_cf); | |
645 | spin_unlock(&ci->i_ceph_lock); | |
646 | if (dirty) | |
647 | __mark_inode_dirty(inode, dirty); | |
648 | ||
649 | } | |
650 | ||
651 | ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR : | |
652 | CEPH_CAP_FILE_RD)); | |
653 | ||
654 | aio_req->iocb->ki_complete(aio_req->iocb, ret, 0); | |
655 | ||
656 | ceph_free_cap_flush(aio_req->prealloc_cf); | |
657 | kfree(aio_req); | |
658 | } | |
659 | ||
85e084fe | 660 | static void ceph_aio_complete_req(struct ceph_osd_request *req) |
c8fe9b17 YZ |
661 | { |
662 | int rc = req->r_result; | |
663 | struct inode *inode = req->r_inode; | |
664 | struct ceph_aio_request *aio_req = req->r_priv; | |
665 | struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); | |
666 | int num_pages = calc_pages_for((u64)osd_data->alignment, | |
667 | osd_data->length); | |
668 | ||
669 | dout("ceph_aio_complete_req %p rc %d bytes %llu\n", | |
670 | inode, rc, osd_data->length); | |
671 | ||
672 | if (rc == -EOLDSNAPC) { | |
5be0389d YZ |
673 | struct ceph_aio_work *aio_work; |
674 | BUG_ON(!aio_req->write); | |
675 | ||
676 | aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS); | |
677 | if (aio_work) { | |
678 | INIT_WORK(&aio_work->work, ceph_aio_retry_work); | |
679 | aio_work->req = req; | |
680 | queue_work(ceph_inode_to_client(inode)->wb_wq, | |
681 | &aio_work->work); | |
682 | return; | |
683 | } | |
684 | rc = -ENOMEM; | |
685 | } else if (!aio_req->write) { | |
c8fe9b17 YZ |
686 | if (rc == -ENOENT) |
687 | rc = 0; | |
688 | if (rc >= 0 && osd_data->length > rc) { | |
689 | int zoff = osd_data->alignment + rc; | |
690 | int zlen = osd_data->length - rc; | |
691 | /* | |
692 | * If read is satisfied by single OSD request, | |
693 | * it can pass EOF. Otherwise read is within | |
694 | * i_size. | |
695 | */ | |
696 | if (aio_req->num_reqs == 1) { | |
697 | loff_t i_size = i_size_read(inode); | |
698 | loff_t endoff = aio_req->iocb->ki_pos + rc; | |
699 | if (endoff < i_size) | |
700 | zlen = min_t(size_t, zlen, | |
701 | i_size - endoff); | |
702 | aio_req->total_len = rc + zlen; | |
703 | } | |
704 | ||
705 | if (zlen > 0) | |
706 | ceph_zero_page_vector_range(zoff, zlen, | |
707 | osd_data->pages); | |
708 | } | |
709 | } | |
710 | ||
711 | ceph_put_page_vector(osd_data->pages, num_pages, false); | |
712 | ceph_osdc_put_request(req); | |
713 | ||
714 | if (rc < 0) | |
715 | cmpxchg(&aio_req->error, 0, rc); | |
716 | ||
717 | ceph_aio_complete(inode, aio_req); | |
718 | return; | |
719 | } | |
720 | ||
5be0389d YZ |
721 | static void ceph_aio_retry_work(struct work_struct *work) |
722 | { | |
723 | struct ceph_aio_work *aio_work = | |
724 | container_of(work, struct ceph_aio_work, work); | |
725 | struct ceph_osd_request *orig_req = aio_work->req; | |
726 | struct ceph_aio_request *aio_req = orig_req->r_priv; | |
727 | struct inode *inode = orig_req->r_inode; | |
728 | struct ceph_inode_info *ci = ceph_inode(inode); | |
729 | struct ceph_snap_context *snapc; | |
730 | struct ceph_osd_request *req; | |
731 | int ret; | |
732 | ||
733 | spin_lock(&ci->i_ceph_lock); | |
734 | if (__ceph_have_pending_cap_snap(ci)) { | |
735 | struct ceph_cap_snap *capsnap = | |
736 | list_last_entry(&ci->i_cap_snaps, | |
737 | struct ceph_cap_snap, | |
738 | ci_item); | |
739 | snapc = ceph_get_snap_context(capsnap->context); | |
740 | } else { | |
741 | BUG_ON(!ci->i_head_snapc); | |
742 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
743 | } | |
744 | spin_unlock(&ci->i_ceph_lock); | |
745 | ||
746 | req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2, | |
747 | false, GFP_NOFS); | |
1418bf07 DC |
748 | if (!req) { |
749 | ret = -ENOMEM; | |
5be0389d YZ |
750 | req = orig_req; |
751 | goto out; | |
752 | } | |
753 | ||
754 | req->r_flags = CEPH_OSD_FLAG_ORDERSNAP | | |
755 | CEPH_OSD_FLAG_ONDISK | | |
756 | CEPH_OSD_FLAG_WRITE; | |
63244fa1 | 757 | ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc); |
d30291b9 | 758 | ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid); |
5be0389d | 759 | |
13d1ad16 ID |
760 | ret = ceph_osdc_alloc_messages(req, GFP_NOFS); |
761 | if (ret) { | |
762 | ceph_osdc_put_request(req); | |
763 | req = orig_req; | |
764 | goto out; | |
765 | } | |
5be0389d YZ |
766 | |
767 | req->r_ops[0] = orig_req->r_ops[0]; | |
768 | osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0); | |
769 | ||
bb873b53 ID |
770 | req->r_mtime = aio_req->mtime; |
771 | req->r_data_offset = req->r_ops[0].extent.offset; | |
5be0389d | 772 | |
5be0389d YZ |
773 | ceph_osdc_put_request(orig_req); |
774 | ||
775 | req->r_callback = ceph_aio_complete_req; | |
776 | req->r_inode = inode; | |
777 | req->r_priv = aio_req; | |
778 | ||
779 | ret = ceph_osdc_start_request(req->r_osdc, req, false); | |
780 | out: | |
781 | if (ret < 0) { | |
5be0389d | 782 | req->r_result = ret; |
85e084fe | 783 | ceph_aio_complete_req(req); |
5be0389d YZ |
784 | } |
785 | ||
db6aed70 | 786 | ceph_put_snap_context(snapc); |
5be0389d YZ |
787 | kfree(aio_work); |
788 | } | |
789 | ||
124e68e7 | 790 | /* |
26be8808 AE |
791 | * Write commit request unsafe callback, called to tell us when a |
792 | * request is unsafe (that is, in flight--has been handed to the | |
793 | * messenger to send to its target osd). It is called again when | |
794 | * we've received a response message indicating the request is | |
795 | * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request | |
796 | * is completed early (and unsuccessfully) due to a timeout or | |
797 | * interrupt. | |
798 | * | |
799 | * This is used if we requested both an ACK and ONDISK commit reply | |
800 | * from the OSD. | |
124e68e7 | 801 | */ |
26be8808 | 802 | static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) |
124e68e7 SW |
803 | { |
804 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
805 | ||
26be8808 AE |
806 | dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, |
807 | unsafe ? "un" : ""); | |
808 | if (unsafe) { | |
809 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
810 | spin_lock(&ci->i_unsafe_lock); | |
811 | list_add_tail(&req->r_unsafe_item, | |
812 | &ci->i_unsafe_writes); | |
813 | spin_unlock(&ci->i_unsafe_lock); | |
fe5da05e ID |
814 | |
815 | complete_all(&req->r_completion); | |
26be8808 AE |
816 | } else { |
817 | spin_lock(&ci->i_unsafe_lock); | |
818 | list_del_init(&req->r_unsafe_item); | |
819 | spin_unlock(&ci->i_unsafe_lock); | |
820 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
821 | } | |
124e68e7 SW |
822 | } |
823 | ||
e8344e66 | 824 | |
e8344e66 | 825 | static ssize_t |
c8fe9b17 YZ |
826 | ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, |
827 | struct ceph_snap_context *snapc, | |
828 | struct ceph_cap_flush **pcf) | |
124e68e7 | 829 | { |
e8344e66 | 830 | struct file *file = iocb->ki_filp; |
496ad9aa | 831 | struct inode *inode = file_inode(file); |
124e68e7 | 832 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 833 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
acead002 | 834 | struct ceph_vino vino; |
124e68e7 SW |
835 | struct ceph_osd_request *req; |
836 | struct page **pages; | |
c8fe9b17 YZ |
837 | struct ceph_aio_request *aio_req = NULL; |
838 | int num_pages = 0; | |
124e68e7 | 839 | int flags; |
124e68e7 | 840 | int ret; |
8bbd4714 | 841 | struct timespec mtime = current_fs_time(inode->i_sb); |
c8fe9b17 YZ |
842 | size_t count = iov_iter_count(iter); |
843 | loff_t pos = iocb->ki_pos; | |
844 | bool write = iov_iter_rw(iter) == WRITE; | |
124e68e7 | 845 | |
c8fe9b17 | 846 | if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
124e68e7 SW |
847 | return -EROFS; |
848 | ||
c8fe9b17 YZ |
849 | dout("sync_direct_read_write (%s) on file %p %lld~%u\n", |
850 | (write ? "write" : "read"), file, pos, (unsigned)count); | |
124e68e7 | 851 | |
e8344e66 | 852 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); |
29065a51 YS |
853 | if (ret < 0) |
854 | return ret; | |
855 | ||
c8fe9b17 YZ |
856 | if (write) { |
857 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
09cbfeaf KS |
858 | pos >> PAGE_SHIFT, |
859 | (pos + count) >> PAGE_SHIFT); | |
c8fe9b17 YZ |
860 | if (ret < 0) |
861 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
29065a51 | 862 | |
c8fe9b17 YZ |
863 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
864 | CEPH_OSD_FLAG_ONDISK | | |
865 | CEPH_OSD_FLAG_WRITE; | |
866 | } else { | |
867 | flags = CEPH_OSD_FLAG_READ; | |
868 | } | |
124e68e7 | 869 | |
c8fe9b17 YZ |
870 | while (iov_iter_count(iter) > 0) { |
871 | u64 size = dio_get_pagev_size(iter); | |
872 | size_t start = 0; | |
873 | ssize_t len; | |
e8344e66 | 874 | |
e8344e66 | 875 | vino = ceph_vino(inode); |
876 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
c8fe9b17 YZ |
877 | vino, pos, &size, 0, |
878 | /*include a 'startsync' command*/ | |
879 | write ? 2 : 1, | |
880 | write ? CEPH_OSD_OP_WRITE : | |
881 | CEPH_OSD_OP_READ, | |
882 | flags, snapc, | |
e8344e66 | 883 | ci->i_truncate_seq, |
884 | ci->i_truncate_size, | |
885 | false); | |
886 | if (IS_ERR(req)) { | |
887 | ret = PTR_ERR(req); | |
eab87235 | 888 | break; |
e8344e66 | 889 | } |
124e68e7 | 890 | |
c8fe9b17 YZ |
891 | len = size; |
892 | pages = dio_get_pages_alloc(iter, len, &start, &num_pages); | |
b5b98989 | 893 | if (IS_ERR(pages)) { |
64c31311 | 894 | ceph_osdc_put_request(req); |
b5b98989 | 895 | ret = PTR_ERR(pages); |
64c31311 | 896 | break; |
124e68e7 SW |
897 | } |
898 | ||
899 | /* | |
c8fe9b17 YZ |
900 | * To simplify error handling, allow AIO when IO within i_size |
901 | * or IO can be satisfied by single OSD request. | |
124e68e7 | 902 | */ |
c8fe9b17 YZ |
903 | if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) && |
904 | (len == count || pos + count <= i_size_read(inode))) { | |
905 | aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL); | |
906 | if (aio_req) { | |
907 | aio_req->iocb = iocb; | |
908 | aio_req->write = write; | |
909 | INIT_LIST_HEAD(&aio_req->osd_reqs); | |
910 | if (write) { | |
5be0389d | 911 | aio_req->mtime = mtime; |
c8fe9b17 YZ |
912 | swap(aio_req->prealloc_cf, *pcf); |
913 | } | |
914 | } | |
915 | /* ignore error */ | |
916 | } | |
917 | ||
918 | if (write) { | |
919 | /* | |
920 | * throw out any page cache pages in this range. this | |
921 | * may block. | |
922 | */ | |
923 | truncate_inode_pages_range(inode->i_mapping, pos, | |
09cbfeaf | 924 | (pos+len) | (PAGE_SIZE - 1)); |
c8fe9b17 YZ |
925 | |
926 | osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0); | |
bb873b53 | 927 | req->r_mtime = mtime; |
c8fe9b17 YZ |
928 | } |
929 | ||
c8fe9b17 YZ |
930 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, start, |
931 | false, false); | |
e8344e66 | 932 | |
c8fe9b17 YZ |
933 | if (aio_req) { |
934 | aio_req->total_len += len; | |
935 | aio_req->num_reqs++; | |
936 | atomic_inc(&aio_req->pending_reqs); | |
937 | ||
938 | req->r_callback = ceph_aio_complete_req; | |
939 | req->r_inode = inode; | |
940 | req->r_priv = aio_req; | |
941 | list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs); | |
942 | ||
943 | pos += len; | |
944 | iov_iter_advance(iter, len); | |
945 | continue; | |
946 | } | |
947 | ||
948 | ret = ceph_osdc_start_request(req->r_osdc, req, false); | |
e8344e66 | 949 | if (!ret) |
950 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
951 | ||
c8fe9b17 YZ |
952 | size = i_size_read(inode); |
953 | if (!write) { | |
954 | if (ret == -ENOENT) | |
955 | ret = 0; | |
956 | if (ret >= 0 && ret < len && pos + ret < size) { | |
957 | int zlen = min_t(size_t, len - ret, | |
958 | size - pos - ret); | |
959 | ceph_zero_page_vector_range(start + ret, zlen, | |
960 | pages); | |
961 | ret += zlen; | |
962 | } | |
963 | if (ret >= 0) | |
964 | len = ret; | |
965 | } | |
966 | ||
e8344e66 | 967 | ceph_put_page_vector(pages, num_pages, false); |
968 | ||
e8344e66 | 969 | ceph_osdc_put_request(req); |
c8fe9b17 | 970 | if (ret < 0) |
e8344e66 | 971 | break; |
64c31311 | 972 | |
c8fe9b17 YZ |
973 | pos += len; |
974 | iov_iter_advance(iter, len); | |
975 | ||
976 | if (!write && pos >= size) | |
e8344e66 | 977 | break; |
64c31311 | 978 | |
c8fe9b17 YZ |
979 | if (write && pos > size) { |
980 | if (ceph_inode_set_size(inode, pos)) | |
64c31311 AV |
981 | ceph_check_caps(ceph_inode(inode), |
982 | CHECK_CAPS_AUTHONLY, | |
983 | NULL); | |
984 | } | |
e8344e66 | 985 | } |
986 | ||
c8fe9b17 YZ |
987 | if (aio_req) { |
988 | if (aio_req->num_reqs == 0) { | |
989 | kfree(aio_req); | |
990 | return ret; | |
991 | } | |
992 | ||
993 | ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR : | |
994 | CEPH_CAP_FILE_RD); | |
995 | ||
996 | while (!list_empty(&aio_req->osd_reqs)) { | |
997 | req = list_first_entry(&aio_req->osd_reqs, | |
998 | struct ceph_osd_request, | |
999 | r_unsafe_item); | |
1000 | list_del_init(&req->r_unsafe_item); | |
1001 | if (ret >= 0) | |
1002 | ret = ceph_osdc_start_request(req->r_osdc, | |
1003 | req, false); | |
1004 | if (ret < 0) { | |
1005 | req->r_result = ret; | |
85e084fe | 1006 | ceph_aio_complete_req(req); |
c8fe9b17 YZ |
1007 | } |
1008 | } | |
1009 | return -EIOCBQUEUED; | |
1010 | } | |
1011 | ||
1012 | if (ret != -EOLDSNAPC && pos > iocb->ki_pos) { | |
1013 | ret = pos - iocb->ki_pos; | |
e8344e66 | 1014 | iocb->ki_pos = pos; |
e8344e66 | 1015 | } |
1016 | return ret; | |
1017 | } | |
1018 | ||
e8344e66 | 1019 | /* |
1020 | * Synchronous write, straight from __user pointer or user pages. | |
1021 | * | |
1022 | * If write spans object boundary, just do multiple writes. (For a | |
1023 | * correct atomic write, we should e.g. take write locks on all | |
1024 | * objects, rollback on failure, etc.) | |
1025 | */ | |
06fee30f | 1026 | static ssize_t |
5dda377c YZ |
1027 | ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, |
1028 | struct ceph_snap_context *snapc) | |
e8344e66 | 1029 | { |
1030 | struct file *file = iocb->ki_filp; | |
1031 | struct inode *inode = file_inode(file); | |
1032 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1033 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
e8344e66 | 1034 | struct ceph_vino vino; |
1035 | struct ceph_osd_request *req; | |
1036 | struct page **pages; | |
1037 | u64 len; | |
1038 | int num_pages; | |
1039 | int written = 0; | |
1040 | int flags; | |
1041 | int check_caps = 0; | |
1042 | int ret; | |
8bbd4714 | 1043 | struct timespec mtime = current_fs_time(inode->i_sb); |
4908b822 | 1044 | size_t count = iov_iter_count(from); |
e8344e66 | 1045 | |
1046 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) | |
1047 | return -EROFS; | |
1048 | ||
1049 | dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count); | |
1050 | ||
1051 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); | |
1052 | if (ret < 0) | |
1053 | return ret; | |
1054 | ||
1055 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
09cbfeaf KS |
1056 | pos >> PAGE_SHIFT, |
1057 | (pos + count) >> PAGE_SHIFT); | |
e8344e66 | 1058 | if (ret < 0) |
1059 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
1060 | ||
1061 | flags = CEPH_OSD_FLAG_ORDERSNAP | | |
1062 | CEPH_OSD_FLAG_ONDISK | | |
1063 | CEPH_OSD_FLAG_WRITE | | |
1064 | CEPH_OSD_FLAG_ACK; | |
1065 | ||
4908b822 | 1066 | while ((len = iov_iter_count(from)) > 0) { |
e8344e66 | 1067 | size_t left; |
1068 | int n; | |
1069 | ||
e8344e66 | 1070 | vino = ceph_vino(inode); |
1071 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
715e4cd4 | 1072 | vino, pos, &len, 0, 1, |
e8344e66 | 1073 | CEPH_OSD_OP_WRITE, flags, snapc, |
1074 | ci->i_truncate_seq, | |
1075 | ci->i_truncate_size, | |
1076 | false); | |
1077 | if (IS_ERR(req)) { | |
1078 | ret = PTR_ERR(req); | |
eab87235 | 1079 | break; |
e8344e66 | 1080 | } |
1081 | ||
1082 | /* | |
1083 | * write from beginning of first page, | |
1084 | * regardless of io alignment | |
1085 | */ | |
09cbfeaf | 1086 | num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e8344e66 | 1087 | |
687265e5 | 1088 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
124e68e7 SW |
1089 | if (IS_ERR(pages)) { |
1090 | ret = PTR_ERR(pages); | |
1091 | goto out; | |
1092 | } | |
e8344e66 | 1093 | |
1094 | left = len; | |
1095 | for (n = 0; n < num_pages; n++) { | |
125d725c | 1096 | size_t plen = min_t(size_t, left, PAGE_SIZE); |
4908b822 | 1097 | ret = copy_page_from_iter(pages[n], 0, plen, from); |
e8344e66 | 1098 | if (ret != plen) { |
1099 | ret = -EFAULT; | |
1100 | break; | |
1101 | } | |
1102 | left -= ret; | |
e8344e66 | 1103 | } |
1104 | ||
124e68e7 SW |
1105 | if (ret < 0) { |
1106 | ceph_release_page_vector(pages, num_pages); | |
1107 | goto out; | |
1108 | } | |
1109 | ||
e8344e66 | 1110 | /* get a second commit callback */ |
1111 | req->r_unsafe_callback = ceph_sync_write_unsafe; | |
1112 | req->r_inode = inode; | |
124e68e7 | 1113 | |
e8344e66 | 1114 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, |
1115 | false, true); | |
02ee07d3 | 1116 | |
bb873b53 | 1117 | req->r_mtime = mtime; |
e8344e66 | 1118 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1119 | if (!ret) | |
1120 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
124e68e7 SW |
1121 | |
1122 | out: | |
e8344e66 | 1123 | ceph_osdc_put_request(req); |
1124 | if (ret == 0) { | |
1125 | pos += len; | |
1126 | written += len; | |
1127 | ||
1128 | if (pos > i_size_read(inode)) { | |
1129 | check_caps = ceph_inode_set_size(inode, pos); | |
1130 | if (check_caps) | |
1131 | ceph_check_caps(ceph_inode(inode), | |
1132 | CHECK_CAPS_AUTHONLY, | |
1133 | NULL); | |
1134 | } | |
1135 | } else | |
1136 | break; | |
1137 | } | |
124e68e7 | 1138 | |
e8344e66 | 1139 | if (ret != -EOLDSNAPC && written > 0) { |
124e68e7 | 1140 | ret = written; |
e8344e66 | 1141 | iocb->ki_pos = pos; |
124e68e7 SW |
1142 | } |
1143 | return ret; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
1148 | * Atomically grab references, so that those bits are not released | |
1149 | * back to the MDS mid-read. | |
1150 | * | |
1151 | * Hmm, the sync read case isn't actually async... should it be? | |
1152 | */ | |
3644424d | 1153 | static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) |
124e68e7 SW |
1154 | { |
1155 | struct file *filp = iocb->ki_filp; | |
2962507c | 1156 | struct ceph_file_info *fi = filp->private_data; |
66ee59af | 1157 | size_t len = iov_iter_count(to); |
496ad9aa | 1158 | struct inode *inode = file_inode(filp); |
124e68e7 | 1159 | struct ceph_inode_info *ci = ceph_inode(inode); |
3738daa6 | 1160 | struct page *pinned_page = NULL; |
124e68e7 | 1161 | ssize_t ret; |
2962507c | 1162 | int want, got = 0; |
83701246 | 1163 | int retry_op = 0, read = 0; |
124e68e7 | 1164 | |
6a026589 | 1165 | again: |
8eb4efb0 | 1166 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", |
1167 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); | |
1168 | ||
2962507c SW |
1169 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1170 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
1171 | else | |
1172 | want = CEPH_CAP_FILE_CACHE; | |
3738daa6 | 1173 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); |
124e68e7 | 1174 | if (ret < 0) |
8eb4efb0 | 1175 | return ret; |
124e68e7 | 1176 | |
2962507c | 1177 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
2ba48ce5 | 1178 | (iocb->ki_flags & IOCB_DIRECT) || |
8eb4efb0 | 1179 | (fi->flags & CEPH_F_SYNC)) { |
8eb4efb0 | 1180 | |
1181 | dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
1182 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, | |
1183 | ceph_cap_string(got)); | |
1184 | ||
83701246 | 1185 | if (ci->i_inline_version == CEPH_INLINE_NONE) { |
c8fe9b17 YZ |
1186 | if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) { |
1187 | ret = ceph_direct_read_write(iocb, to, | |
1188 | NULL, NULL); | |
1189 | if (ret >= 0 && ret < len) | |
1190 | retry_op = CHECK_EOF; | |
1191 | } else { | |
1192 | ret = ceph_sync_read(iocb, to, &retry_op); | |
1193 | } | |
83701246 YZ |
1194 | } else { |
1195 | retry_op = READ_INLINE; | |
1196 | } | |
8eb4efb0 | 1197 | } else { |
8eb4efb0 | 1198 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", |
3644424d | 1199 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, |
8eb4efb0 | 1200 | ceph_cap_string(got)); |
124e68e7 | 1201 | |
3644424d | 1202 | ret = generic_file_read_iter(iocb, to); |
8eb4efb0 | 1203 | } |
124e68e7 SW |
1204 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", |
1205 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
3738daa6 | 1206 | if (pinned_page) { |
09cbfeaf | 1207 | put_page(pinned_page); |
3738daa6 YZ |
1208 | pinned_page = NULL; |
1209 | } | |
124e68e7 | 1210 | ceph_put_cap_refs(ci, got); |
c8fe9b17 | 1211 | if (retry_op > HAVE_RETRIED && ret >= 0) { |
83701246 YZ |
1212 | int statret; |
1213 | struct page *page = NULL; | |
1214 | loff_t i_size; | |
1215 | if (retry_op == READ_INLINE) { | |
687265e5 | 1216 | page = __page_cache_alloc(GFP_KERNEL); |
83701246 YZ |
1217 | if (!page) |
1218 | return -ENOMEM; | |
1219 | } | |
6a026589 | 1220 | |
83701246 YZ |
1221 | statret = __ceph_do_getattr(inode, page, |
1222 | CEPH_STAT_CAP_INLINE_DATA, !!page); | |
1223 | if (statret < 0) { | |
1224 | __free_page(page); | |
1225 | if (statret == -ENODATA) { | |
1226 | BUG_ON(retry_op != READ_INLINE); | |
1227 | goto again; | |
1228 | } | |
1229 | return statret; | |
1230 | } | |
6a026589 | 1231 | |
83701246 YZ |
1232 | i_size = i_size_read(inode); |
1233 | if (retry_op == READ_INLINE) { | |
fcc02d2a YZ |
1234 | BUG_ON(ret > 0 || read > 0); |
1235 | if (iocb->ki_pos < i_size && | |
09cbfeaf | 1236 | iocb->ki_pos < PAGE_SIZE) { |
83701246 YZ |
1237 | loff_t end = min_t(loff_t, i_size, |
1238 | iocb->ki_pos + len); | |
09cbfeaf | 1239 | end = min_t(loff_t, end, PAGE_SIZE); |
83701246 YZ |
1240 | if (statret < end) |
1241 | zero_user_segment(page, statret, end); | |
1242 | ret = copy_page_to_iter(page, | |
1243 | iocb->ki_pos & ~PAGE_MASK, | |
1244 | end - iocb->ki_pos, to); | |
1245 | iocb->ki_pos += ret; | |
fcc02d2a YZ |
1246 | read += ret; |
1247 | } | |
1248 | if (iocb->ki_pos < i_size && read < len) { | |
1249 | size_t zlen = min_t(size_t, len - read, | |
1250 | i_size - iocb->ki_pos); | |
1251 | ret = iov_iter_zero(zlen, to); | |
1252 | iocb->ki_pos += ret; | |
1253 | read += ret; | |
83701246 YZ |
1254 | } |
1255 | __free_pages(page, 0); | |
fcc02d2a | 1256 | return read; |
83701246 | 1257 | } |
6a026589 SW |
1258 | |
1259 | /* hit EOF or hole? */ | |
83701246 | 1260 | if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && |
fcc02d2a | 1261 | ret < len) { |
8eb4efb0 | 1262 | dout("sync_read hit hole, ppos %lld < size %lld" |
99c88e69 | 1263 | ", reading more\n", iocb->ki_pos, i_size); |
8eb4efb0 | 1264 | |
6a026589 | 1265 | read += ret; |
6a026589 | 1266 | len -= ret; |
c8fe9b17 | 1267 | retry_op = HAVE_RETRIED; |
6a026589 SW |
1268 | goto again; |
1269 | } | |
1270 | } | |
8eb4efb0 | 1271 | |
6a026589 SW |
1272 | if (ret >= 0) |
1273 | ret += read; | |
1274 | ||
124e68e7 SW |
1275 | return ret; |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * Take cap references to avoid releasing caps to MDS mid-write. | |
1280 | * | |
1281 | * If we are synchronous, and write with an old snap context, the OSD | |
1282 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
1283 | * dropping our cap refs and allowing the pending snap to logically | |
1284 | * complete _before_ this write occurs. | |
1285 | * | |
1286 | * If we are near ENOSPC, write synchronously. | |
1287 | */ | |
4908b822 | 1288 | static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) |
124e68e7 SW |
1289 | { |
1290 | struct file *file = iocb->ki_filp; | |
33caad32 | 1291 | struct ceph_file_info *fi = file->private_data; |
496ad9aa | 1292 | struct inode *inode = file_inode(file); |
124e68e7 | 1293 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
1294 | struct ceph_osd_client *osdc = |
1295 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
f66fd9f0 | 1296 | struct ceph_cap_flush *prealloc_cf; |
3309dd04 | 1297 | ssize_t count, written = 0; |
03d254ed | 1298 | int err, want, got; |
3309dd04 | 1299 | loff_t pos; |
124e68e7 SW |
1300 | |
1301 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
1302 | return -EROFS; | |
1303 | ||
f66fd9f0 YZ |
1304 | prealloc_cf = ceph_alloc_cap_flush(); |
1305 | if (!prealloc_cf) | |
1306 | return -ENOMEM; | |
1307 | ||
5955102c | 1308 | inode_lock(inode); |
03d254ed | 1309 | |
03d254ed | 1310 | /* We can write back this queue in page reclaim */ |
de1414a6 | 1311 | current->backing_dev_info = inode_to_bdi(inode); |
03d254ed | 1312 | |
55b0b31c YZ |
1313 | if (iocb->ki_flags & IOCB_APPEND) { |
1314 | err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); | |
1315 | if (err < 0) | |
1316 | goto out; | |
1317 | } | |
1318 | ||
3309dd04 AV |
1319 | err = generic_write_checks(iocb, from); |
1320 | if (err <= 0) | |
03d254ed YZ |
1321 | goto out; |
1322 | ||
3309dd04 AV |
1323 | pos = iocb->ki_pos; |
1324 | count = iov_iter_count(from); | |
5fa8e0a1 | 1325 | err = file_remove_privs(file); |
03d254ed YZ |
1326 | if (err) |
1327 | goto out; | |
1328 | ||
1329 | err = file_update_time(file); | |
1330 | if (err) | |
1331 | goto out; | |
1332 | ||
28127bdd YZ |
1333 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1334 | err = ceph_uninline_data(file, NULL); | |
1335 | if (err < 0) | |
1336 | goto out; | |
1337 | } | |
1338 | ||
124e68e7 | 1339 | retry_snap: |
b7ec35b3 | 1340 | if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) { |
03d254ed | 1341 | err = -ENOSPC; |
6070e0c1 YZ |
1342 | goto out; |
1343 | } | |
03d254ed | 1344 | |
ac7f29bf | 1345 | dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", |
99c88e69 | 1346 | inode, ceph_vinop(inode), pos, count, i_size_read(inode)); |
7971bd92 SW |
1347 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
1348 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1349 | else | |
1350 | want = CEPH_CAP_FILE_BUFFER; | |
03d254ed | 1351 | got = 0; |
3738daa6 YZ |
1352 | err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count, |
1353 | &got, NULL); | |
03d254ed | 1354 | if (err < 0) |
37505d57 | 1355 | goto out; |
124e68e7 | 1356 | |
ac7f29bf | 1357 | dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", |
03d254ed | 1358 | inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); |
7971bd92 SW |
1359 | |
1360 | if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || | |
2ba48ce5 | 1361 | (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) { |
5dda377c | 1362 | struct ceph_snap_context *snapc; |
4908b822 | 1363 | struct iov_iter data; |
5955102c | 1364 | inode_unlock(inode); |
5dda377c YZ |
1365 | |
1366 | spin_lock(&ci->i_ceph_lock); | |
1367 | if (__ceph_have_pending_cap_snap(ci)) { | |
1368 | struct ceph_cap_snap *capsnap = | |
1369 | list_last_entry(&ci->i_cap_snaps, | |
1370 | struct ceph_cap_snap, | |
1371 | ci_item); | |
1372 | snapc = ceph_get_snap_context(capsnap->context); | |
1373 | } else { | |
1374 | BUG_ON(!ci->i_head_snapc); | |
1375 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
1376 | } | |
1377 | spin_unlock(&ci->i_ceph_lock); | |
1378 | ||
4908b822 AV |
1379 | /* we might need to revert back to that point */ |
1380 | data = *from; | |
2ba48ce5 | 1381 | if (iocb->ki_flags & IOCB_DIRECT) |
c8fe9b17 YZ |
1382 | written = ceph_direct_read_write(iocb, &data, snapc, |
1383 | &prealloc_cf); | |
e8344e66 | 1384 | else |
5dda377c | 1385 | written = ceph_sync_write(iocb, &data, pos, snapc); |
0e5dd45c | 1386 | if (written == -EOLDSNAPC) { |
1387 | dout("aio_write %p %llx.%llx %llu~%u" | |
1388 | "got EOLDSNAPC, retrying\n", | |
1389 | inode, ceph_vinop(inode), | |
4908b822 | 1390 | pos, (unsigned)count); |
5955102c | 1391 | inode_lock(inode); |
0e5dd45c | 1392 | goto retry_snap; |
1393 | } | |
4908b822 AV |
1394 | if (written > 0) |
1395 | iov_iter_advance(from, written); | |
5dda377c | 1396 | ceph_put_snap_context(snapc); |
7971bd92 | 1397 | } else { |
b0d7c223 YZ |
1398 | /* |
1399 | * No need to acquire the i_truncate_mutex. Because | |
1400 | * the MDS revokes Fwb caps before sending truncate | |
1401 | * message to us. We can't get Fwb cap while there | |
1402 | * are pending vmtruncate. So write and vmtruncate | |
1403 | * can not run at the same time | |
1404 | */ | |
4908b822 | 1405 | written = generic_perform_write(file, from, pos); |
aec605f4 AV |
1406 | if (likely(written >= 0)) |
1407 | iocb->ki_pos = pos + written; | |
5955102c | 1408 | inode_unlock(inode); |
7971bd92 | 1409 | } |
d8de9ab6 | 1410 | |
03d254ed | 1411 | if (written >= 0) { |
fca65b4a | 1412 | int dirty; |
be655596 | 1413 | spin_lock(&ci->i_ceph_lock); |
28127bdd | 1414 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1415 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1416 | &prealloc_cf); | |
be655596 | 1417 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
1418 | if (dirty) |
1419 | __mark_inode_dirty(inode, dirty); | |
124e68e7 | 1420 | } |
7971bd92 | 1421 | |
124e68e7 | 1422 | dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", |
4908b822 | 1423 | inode, ceph_vinop(inode), pos, (unsigned)count, |
7971bd92 | 1424 | ceph_cap_string(got)); |
124e68e7 | 1425 | ceph_put_cap_refs(ci, got); |
7971bd92 | 1426 | |
6aa657c8 | 1427 | if (written >= 0) { |
b7ec35b3 | 1428 | if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL)) |
6aa657c8 CH |
1429 | iocb->ki_flags |= IOCB_DSYNC; |
1430 | ||
1431 | written = generic_write_sync(iocb, written); | |
6070e0c1 | 1432 | } |
03d254ed | 1433 | |
2f75e9e1 SW |
1434 | goto out_unlocked; |
1435 | ||
03d254ed | 1436 | out: |
5955102c | 1437 | inode_unlock(inode); |
2f75e9e1 | 1438 | out_unlocked: |
f66fd9f0 | 1439 | ceph_free_cap_flush(prealloc_cf); |
03d254ed | 1440 | current->backing_dev_info = NULL; |
03d254ed | 1441 | return written ? written : err; |
124e68e7 SW |
1442 | } |
1443 | ||
1444 | /* | |
1445 | * llseek. be sure to verify file size on SEEK_END. | |
1446 | */ | |
965c8e59 | 1447 | static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) |
124e68e7 SW |
1448 | { |
1449 | struct inode *inode = file->f_mapping->host; | |
99c88e69 | 1450 | loff_t i_size; |
124e68e7 SW |
1451 | int ret; |
1452 | ||
5955102c | 1453 | inode_lock(inode); |
6a82c47a | 1454 | |
965c8e59 | 1455 | if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { |
508b32d8 | 1456 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); |
124e68e7 SW |
1457 | if (ret < 0) { |
1458 | offset = ret; | |
1459 | goto out; | |
1460 | } | |
06222e49 JB |
1461 | } |
1462 | ||
99c88e69 | 1463 | i_size = i_size_read(inode); |
965c8e59 | 1464 | switch (whence) { |
06222e49 | 1465 | case SEEK_END: |
99c88e69 | 1466 | offset += i_size; |
124e68e7 SW |
1467 | break; |
1468 | case SEEK_CUR: | |
1469 | /* | |
1470 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
1471 | * position-querying operation. Avoid rewriting the "same" | |
1472 | * f_pos value back to the file because a concurrent read(), | |
1473 | * write() or lseek() might have altered it | |
1474 | */ | |
1475 | if (offset == 0) { | |
1476 | offset = file->f_pos; | |
1477 | goto out; | |
1478 | } | |
1479 | offset += file->f_pos; | |
1480 | break; | |
06222e49 | 1481 | case SEEK_DATA: |
99c88e69 | 1482 | if (offset >= i_size) { |
06222e49 JB |
1483 | ret = -ENXIO; |
1484 | goto out; | |
1485 | } | |
1486 | break; | |
1487 | case SEEK_HOLE: | |
99c88e69 | 1488 | if (offset >= i_size) { |
06222e49 JB |
1489 | ret = -ENXIO; |
1490 | goto out; | |
1491 | } | |
99c88e69 | 1492 | offset = i_size; |
06222e49 | 1493 | break; |
124e68e7 SW |
1494 | } |
1495 | ||
46a1c2c7 | 1496 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
124e68e7 SW |
1497 | |
1498 | out: | |
5955102c | 1499 | inode_unlock(inode); |
124e68e7 SW |
1500 | return offset; |
1501 | } | |
1502 | ||
ad7a60de LW |
1503 | static inline void ceph_zero_partial_page( |
1504 | struct inode *inode, loff_t offset, unsigned size) | |
1505 | { | |
1506 | struct page *page; | |
09cbfeaf | 1507 | pgoff_t index = offset >> PAGE_SHIFT; |
ad7a60de LW |
1508 | |
1509 | page = find_lock_page(inode->i_mapping, index); | |
1510 | if (page) { | |
1511 | wait_on_page_writeback(page); | |
09cbfeaf | 1512 | zero_user(page, offset & (PAGE_SIZE - 1), size); |
ad7a60de | 1513 | unlock_page(page); |
09cbfeaf | 1514 | put_page(page); |
ad7a60de LW |
1515 | } |
1516 | } | |
1517 | ||
1518 | static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, | |
1519 | loff_t length) | |
1520 | { | |
09cbfeaf | 1521 | loff_t nearly = round_up(offset, PAGE_SIZE); |
ad7a60de LW |
1522 | if (offset < nearly) { |
1523 | loff_t size = nearly - offset; | |
1524 | if (length < size) | |
1525 | size = length; | |
1526 | ceph_zero_partial_page(inode, offset, size); | |
1527 | offset += size; | |
1528 | length -= size; | |
1529 | } | |
09cbfeaf KS |
1530 | if (length >= PAGE_SIZE) { |
1531 | loff_t size = round_down(length, PAGE_SIZE); | |
ad7a60de LW |
1532 | truncate_pagecache_range(inode, offset, offset + size - 1); |
1533 | offset += size; | |
1534 | length -= size; | |
1535 | } | |
1536 | if (length) | |
1537 | ceph_zero_partial_page(inode, offset, length); | |
1538 | } | |
1539 | ||
1540 | static int ceph_zero_partial_object(struct inode *inode, | |
1541 | loff_t offset, loff_t *length) | |
1542 | { | |
1543 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1544 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1545 | struct ceph_osd_request *req; | |
1546 | int ret = 0; | |
1547 | loff_t zero = 0; | |
1548 | int op; | |
1549 | ||
1550 | if (!length) { | |
1551 | op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; | |
1552 | length = &zero; | |
1553 | } else { | |
1554 | op = CEPH_OSD_OP_ZERO; | |
1555 | } | |
1556 | ||
1557 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1558 | ceph_vino(inode), | |
1559 | offset, length, | |
715e4cd4 | 1560 | 0, 1, op, |
ad7a60de LW |
1561 | CEPH_OSD_FLAG_WRITE | |
1562 | CEPH_OSD_FLAG_ONDISK, | |
1563 | NULL, 0, 0, false); | |
1564 | if (IS_ERR(req)) { | |
1565 | ret = PTR_ERR(req); | |
1566 | goto out; | |
1567 | } | |
1568 | ||
bb873b53 | 1569 | req->r_mtime = inode->i_mtime; |
ad7a60de LW |
1570 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
1571 | if (!ret) { | |
1572 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1573 | if (ret == -ENOENT) | |
1574 | ret = 0; | |
1575 | } | |
1576 | ceph_osdc_put_request(req); | |
1577 | ||
1578 | out: | |
1579 | return ret; | |
1580 | } | |
1581 | ||
1582 | static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) | |
1583 | { | |
1584 | int ret = 0; | |
1585 | struct ceph_inode_info *ci = ceph_inode(inode); | |
b314a90d SW |
1586 | s32 stripe_unit = ceph_file_layout_su(ci->i_layout); |
1587 | s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); | |
1588 | s32 object_size = ceph_file_layout_object_size(ci->i_layout); | |
1589 | u64 object_set_size = object_size * stripe_count; | |
1590 | u64 nearly, t; | |
1591 | ||
1592 | /* round offset up to next period boundary */ | |
1593 | nearly = offset + object_set_size - 1; | |
1594 | t = nearly; | |
1595 | nearly -= do_div(t, object_set_size); | |
ad7a60de | 1596 | |
ad7a60de LW |
1597 | while (length && offset < nearly) { |
1598 | loff_t size = length; | |
1599 | ret = ceph_zero_partial_object(inode, offset, &size); | |
1600 | if (ret < 0) | |
1601 | return ret; | |
1602 | offset += size; | |
1603 | length -= size; | |
1604 | } | |
1605 | while (length >= object_set_size) { | |
1606 | int i; | |
1607 | loff_t pos = offset; | |
1608 | for (i = 0; i < stripe_count; ++i) { | |
1609 | ret = ceph_zero_partial_object(inode, pos, NULL); | |
1610 | if (ret < 0) | |
1611 | return ret; | |
1612 | pos += stripe_unit; | |
1613 | } | |
1614 | offset += object_set_size; | |
1615 | length -= object_set_size; | |
1616 | } | |
1617 | while (length) { | |
1618 | loff_t size = length; | |
1619 | ret = ceph_zero_partial_object(inode, offset, &size); | |
1620 | if (ret < 0) | |
1621 | return ret; | |
1622 | offset += size; | |
1623 | length -= size; | |
1624 | } | |
1625 | return ret; | |
1626 | } | |
1627 | ||
1628 | static long ceph_fallocate(struct file *file, int mode, | |
1629 | loff_t offset, loff_t length) | |
1630 | { | |
1631 | struct ceph_file_info *fi = file->private_data; | |
aa8b60e0 | 1632 | struct inode *inode = file_inode(file); |
ad7a60de LW |
1633 | struct ceph_inode_info *ci = ceph_inode(inode); |
1634 | struct ceph_osd_client *osdc = | |
1635 | &ceph_inode_to_client(inode)->client->osdc; | |
f66fd9f0 | 1636 | struct ceph_cap_flush *prealloc_cf; |
ad7a60de LW |
1637 | int want, got = 0; |
1638 | int dirty; | |
1639 | int ret = 0; | |
1640 | loff_t endoff = 0; | |
1641 | loff_t size; | |
1642 | ||
494d77bf YZ |
1643 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
1644 | return -EOPNOTSUPP; | |
1645 | ||
ad7a60de LW |
1646 | if (!S_ISREG(inode->i_mode)) |
1647 | return -EOPNOTSUPP; | |
1648 | ||
f66fd9f0 YZ |
1649 | prealloc_cf = ceph_alloc_cap_flush(); |
1650 | if (!prealloc_cf) | |
1651 | return -ENOMEM; | |
1652 | ||
5955102c | 1653 | inode_lock(inode); |
ad7a60de LW |
1654 | |
1655 | if (ceph_snap(inode) != CEPH_NOSNAP) { | |
1656 | ret = -EROFS; | |
1657 | goto unlock; | |
1658 | } | |
1659 | ||
b7ec35b3 ID |
1660 | if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && |
1661 | !(mode & FALLOC_FL_PUNCH_HOLE)) { | |
ad7a60de LW |
1662 | ret = -ENOSPC; |
1663 | goto unlock; | |
1664 | } | |
1665 | ||
28127bdd YZ |
1666 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1667 | ret = ceph_uninline_data(file, NULL); | |
1668 | if (ret < 0) | |
1669 | goto unlock; | |
1670 | } | |
1671 | ||
ad7a60de LW |
1672 | size = i_size_read(inode); |
1673 | if (!(mode & FALLOC_FL_KEEP_SIZE)) | |
1674 | endoff = offset + length; | |
1675 | ||
1676 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1677 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1678 | else | |
1679 | want = CEPH_CAP_FILE_BUFFER; | |
1680 | ||
3738daa6 | 1681 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL); |
ad7a60de LW |
1682 | if (ret < 0) |
1683 | goto unlock; | |
1684 | ||
1685 | if (mode & FALLOC_FL_PUNCH_HOLE) { | |
1686 | if (offset < size) | |
1687 | ceph_zero_pagecache_range(inode, offset, length); | |
1688 | ret = ceph_zero_objects(inode, offset, length); | |
1689 | } else if (endoff > size) { | |
1690 | truncate_pagecache_range(inode, size, -1); | |
1691 | if (ceph_inode_set_size(inode, endoff)) | |
1692 | ceph_check_caps(ceph_inode(inode), | |
1693 | CHECK_CAPS_AUTHONLY, NULL); | |
1694 | } | |
1695 | ||
1696 | if (!ret) { | |
1697 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1698 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1699 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1700 | &prealloc_cf); | |
ad7a60de LW |
1701 | spin_unlock(&ci->i_ceph_lock); |
1702 | if (dirty) | |
1703 | __mark_inode_dirty(inode, dirty); | |
1704 | } | |
1705 | ||
1706 | ceph_put_cap_refs(ci, got); | |
1707 | unlock: | |
5955102c | 1708 | inode_unlock(inode); |
f66fd9f0 | 1709 | ceph_free_cap_flush(prealloc_cf); |
ad7a60de LW |
1710 | return ret; |
1711 | } | |
1712 | ||
124e68e7 SW |
1713 | const struct file_operations ceph_file_fops = { |
1714 | .open = ceph_open, | |
1715 | .release = ceph_release, | |
1716 | .llseek = ceph_llseek, | |
3644424d | 1717 | .read_iter = ceph_read_iter, |
4908b822 | 1718 | .write_iter = ceph_write_iter, |
124e68e7 SW |
1719 | .mmap = ceph_mmap, |
1720 | .fsync = ceph_fsync, | |
40819f6f GF |
1721 | .lock = ceph_lock, |
1722 | .flock = ceph_flock, | |
124e68e7 | 1723 | .splice_read = generic_file_splice_read, |
3551dd79 | 1724 | .splice_write = iter_file_splice_write, |
124e68e7 SW |
1725 | .unlocked_ioctl = ceph_ioctl, |
1726 | .compat_ioctl = ceph_ioctl, | |
ad7a60de | 1727 | .fallocate = ceph_fallocate, |
124e68e7 SW |
1728 | }; |
1729 |