Commit | Line | Data |
---|---|---|
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> | |
a27bb332 | 10 | #include <linux/aio.h> |
124e68e7 SW |
11 | |
12 | #include "super.h" | |
13 | #include "mds_client.h" | |
14 | ||
15 | /* | |
16 | * Ceph file operations | |
17 | * | |
18 | * Implement basic open/close functionality, and implement | |
19 | * read/write. | |
20 | * | |
21 | * We implement three modes of file I/O: | |
22 | * - buffered uses the generic_file_aio_{read,write} helpers | |
23 | * | |
24 | * - synchronous is used when there is multi-client read/write | |
25 | * sharing, avoids the page cache, and synchronously waits for an | |
26 | * ack from the OSD. | |
27 | * | |
28 | * - direct io takes the variant of the sync path that references | |
29 | * user pages directly. | |
30 | * | |
31 | * fsync() flushes and waits on dirty pages, but just queues metadata | |
32 | * for writeback: since the MDS can recover size and mtime there is no | |
33 | * need to wait for MDS acknowledgement. | |
34 | */ | |
35 | ||
36 | ||
37 | /* | |
38 | * Prepare an open request. Preallocate ceph_cap to avoid an | |
39 | * inopportune ENOMEM later. | |
40 | */ | |
41 | static struct ceph_mds_request * | |
42 | prepare_open_request(struct super_block *sb, int flags, int create_mode) | |
43 | { | |
3d14c5d2 YS |
44 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
45 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
46 | struct ceph_mds_request *req; |
47 | int want_auth = USE_ANY_MDS; | |
48 | int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; | |
49 | ||
50 | if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) | |
51 | want_auth = USE_AUTH_MDS; | |
52 | ||
53 | req = ceph_mdsc_create_request(mdsc, op, want_auth); | |
54 | if (IS_ERR(req)) | |
55 | goto out; | |
56 | req->r_fmode = ceph_flags_to_mode(flags); | |
57 | req->r_args.open.flags = cpu_to_le32(flags); | |
58 | req->r_args.open.mode = cpu_to_le32(create_mode); | |
124e68e7 SW |
59 | out: |
60 | return req; | |
61 | } | |
62 | ||
63 | /* | |
64 | * initialize private struct file data. | |
65 | * if we fail, clean up by dropping fmode reference on the ceph_inode | |
66 | */ | |
67 | static int ceph_init_file(struct inode *inode, struct file *file, int fmode) | |
68 | { | |
69 | struct ceph_file_info *cf; | |
70 | int ret = 0; | |
71 | ||
72 | switch (inode->i_mode & S_IFMT) { | |
73 | case S_IFREG: | |
74 | case S_IFDIR: | |
75 | dout("init_file %p %p 0%o (regular)\n", inode, file, | |
76 | inode->i_mode); | |
77 | cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO); | |
78 | if (cf == NULL) { | |
79 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
80 | return -ENOMEM; | |
81 | } | |
82 | cf->fmode = fmode; | |
83 | cf->next_offset = 2; | |
84 | file->private_data = cf; | |
85 | BUG_ON(inode->i_fop->release != ceph_release); | |
86 | break; | |
87 | ||
88 | case S_IFLNK: | |
89 | dout("init_file %p %p 0%o (symlink)\n", inode, file, | |
90 | inode->i_mode); | |
91 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
92 | break; | |
93 | ||
94 | default: | |
95 | dout("init_file %p %p 0%o (special)\n", inode, file, | |
96 | inode->i_mode); | |
97 | /* | |
98 | * we need to drop the open ref now, since we don't | |
99 | * have .release set to ceph_release. | |
100 | */ | |
101 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
102 | BUG_ON(inode->i_fop->release == ceph_release); | |
103 | ||
104 | /* call the proper open fop */ | |
105 | ret = inode->i_fop->open(inode, file); | |
106 | } | |
107 | return ret; | |
108 | } | |
109 | ||
110 | /* | |
124e68e7 SW |
111 | * If we already have the requisite capabilities, we can satisfy |
112 | * the open request locally (no need to request new caps from the | |
113 | * MDS). We do, however, need to inform the MDS (asynchronously) | |
114 | * if our wanted caps set expands. | |
115 | */ | |
116 | int ceph_open(struct inode *inode, struct file *file) | |
117 | { | |
118 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 YS |
119 | struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); |
120 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
121 | struct ceph_mds_request *req; |
122 | struct ceph_file_info *cf = file->private_data; | |
5f21c96d | 123 | struct inode *parent_inode = NULL; |
124e68e7 SW |
124 | int err; |
125 | int flags, fmode, wanted; | |
126 | ||
127 | if (cf) { | |
128 | dout("open file %p is already opened\n", file); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ | |
133 | flags = file->f_flags & ~(O_CREAT|O_EXCL); | |
134 | if (S_ISDIR(inode->i_mode)) | |
135 | flags = O_DIRECTORY; /* mds likes to know */ | |
136 | ||
137 | dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, | |
138 | ceph_vinop(inode), file, flags, file->f_flags); | |
139 | fmode = ceph_flags_to_mode(flags); | |
140 | wanted = ceph_caps_for_mode(fmode); | |
141 | ||
142 | /* snapped files are read-only */ | |
143 | if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) | |
144 | return -EROFS; | |
145 | ||
146 | /* trivially open snapdir */ | |
147 | if (ceph_snap(inode) == CEPH_SNAPDIR) { | |
be655596 | 148 | spin_lock(&ci->i_ceph_lock); |
124e68e7 | 149 | __ceph_get_fmode(ci, fmode); |
be655596 | 150 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
151 | return ceph_init_file(inode, file, fmode); |
152 | } | |
153 | ||
154 | /* | |
7421ab80 SW |
155 | * No need to block if we have caps on the auth MDS (for |
156 | * write) or any MDS (for read). Update wanted set | |
124e68e7 SW |
157 | * asynchronously. |
158 | */ | |
be655596 | 159 | spin_lock(&ci->i_ceph_lock); |
7421ab80 SW |
160 | if (__ceph_is_any_real_caps(ci) && |
161 | (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { | |
124e68e7 SW |
162 | int mds_wanted = __ceph_caps_mds_wanted(ci); |
163 | int issued = __ceph_caps_issued(ci, NULL); | |
164 | ||
165 | dout("open %p fmode %d want %s issued %s using existing\n", | |
166 | inode, fmode, ceph_cap_string(wanted), | |
167 | ceph_cap_string(issued)); | |
168 | __ceph_get_fmode(ci, fmode); | |
be655596 | 169 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
170 | |
171 | /* adjust wanted? */ | |
172 | if ((issued & wanted) != wanted && | |
173 | (mds_wanted & wanted) != wanted && | |
174 | ceph_snap(inode) != CEPH_SNAPDIR) | |
175 | ceph_check_caps(ci, 0, NULL); | |
176 | ||
177 | return ceph_init_file(inode, file, fmode); | |
178 | } else if (ceph_snap(inode) != CEPH_NOSNAP && | |
179 | (ci->i_snap_caps & wanted) == wanted) { | |
180 | __ceph_get_fmode(ci, fmode); | |
be655596 | 181 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
182 | return ceph_init_file(inode, file, fmode); |
183 | } | |
be655596 | 184 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
185 | |
186 | dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); | |
187 | req = prepare_open_request(inode->i_sb, flags, 0); | |
188 | if (IS_ERR(req)) { | |
189 | err = PTR_ERR(req); | |
190 | goto out; | |
191 | } | |
70b666c3 SW |
192 | req->r_inode = inode; |
193 | ihold(inode); | |
124e68e7 | 194 | req->r_num_caps = 1; |
5f21c96d SW |
195 | if (flags & (O_CREAT|O_TRUNC)) |
196 | parent_inode = ceph_get_dentry_parent_inode(file->f_dentry); | |
124e68e7 | 197 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); |
5f21c96d | 198 | iput(parent_inode); |
124e68e7 SW |
199 | if (!err) |
200 | err = ceph_init_file(inode, file, req->r_fmode); | |
201 | ceph_mdsc_put_request(req); | |
202 | dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); | |
203 | out: | |
204 | return err; | |
205 | } | |
206 | ||
207 | ||
208 | /* | |
5ef50c3b SW |
209 | * Do a lookup + open with a single request. If we get a non-existent |
210 | * file or symlink, return 1 so the VFS can retry. | |
124e68e7 | 211 | */ |
5ef50c3b | 212 | int ceph_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 213 | struct file *file, unsigned flags, umode_t mode, |
d9585277 | 214 | int *opened) |
124e68e7 | 215 | { |
3d14c5d2 YS |
216 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
217 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 | 218 | struct ceph_mds_request *req; |
5ef50c3b | 219 | struct dentry *dn; |
124e68e7 | 220 | int err; |
124e68e7 | 221 | |
5ef50c3b SW |
222 | dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n", |
223 | dir, dentry, dentry->d_name.len, dentry->d_name.name, | |
224 | d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); | |
225 | ||
226 | if (dentry->d_name.len > NAME_MAX) | |
227 | return -ENAMETOOLONG; | |
228 | ||
229 | err = ceph_init_dentry(dentry); | |
230 | if (err < 0) | |
231 | return err; | |
124e68e7 SW |
232 | |
233 | /* do the open */ | |
234 | req = prepare_open_request(dir->i_sb, flags, mode); | |
235 | if (IS_ERR(req)) | |
d9585277 | 236 | return PTR_ERR(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 */ | |
acda7657 SW |
244 | err = ceph_mdsc_do_request(mdsc, |
245 | (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, | |
246 | req); | |
79aec984 SL |
247 | if (err) |
248 | goto out_err; | |
249 | ||
468640e3 | 250 | err = ceph_handle_snapdir(req, dentry, err); |
5ef50c3b | 251 | if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) |
124e68e7 | 252 | err = ceph_handle_notrace_create(dir, dentry); |
2d83bde9 | 253 | |
5ef50c3b SW |
254 | if (d_unhashed(dentry)) { |
255 | dn = ceph_finish_lookup(req, dentry, err); | |
256 | if (IS_ERR(dn)) | |
257 | err = PTR_ERR(dn); | |
258 | } else { | |
259 | /* we were given a hashed negative dentry */ | |
260 | dn = NULL; | |
261 | } | |
262 | if (err) | |
263 | goto out_err; | |
264 | if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) { | |
265 | /* make vfs retry on splice, ENOENT, or symlink */ | |
266 | dout("atomic_open finish_no_open on dn %p\n", dn); | |
267 | err = finish_no_open(file, dn); | |
268 | } else { | |
269 | dout("atomic_open finish_open on dn %p\n", dn); | |
6e8575fa SL |
270 | if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { |
271 | *opened |= FILE_CREATED; | |
272 | } | |
5ef50c3b SW |
273 | err = finish_open(file, dentry, ceph_open, opened); |
274 | } | |
2d83bde9 | 275 | |
5ef50c3b SW |
276 | out_err: |
277 | ceph_mdsc_put_request(req); | |
278 | dout("atomic_open result=%d\n", err); | |
d9585277 | 279 | return err; |
124e68e7 SW |
280 | } |
281 | ||
282 | int ceph_release(struct inode *inode, struct file *file) | |
283 | { | |
284 | struct ceph_inode_info *ci = ceph_inode(inode); | |
285 | struct ceph_file_info *cf = file->private_data; | |
286 | ||
287 | dout("release inode %p file %p\n", inode, file); | |
288 | ceph_put_fmode(ci, cf->fmode); | |
289 | if (cf->last_readdir) | |
290 | ceph_mdsc_put_request(cf->last_readdir); | |
291 | kfree(cf->last_name); | |
292 | kfree(cf->dir_info); | |
293 | dput(cf->dentry); | |
294 | kmem_cache_free(ceph_file_cachep, cf); | |
195d3ce2 SW |
295 | |
296 | /* wake up anyone waiting for caps on this inode */ | |
03066f23 | 297 | wake_up_all(&ci->i_cap_wq); |
124e68e7 SW |
298 | return 0; |
299 | } | |
300 | ||
124e68e7 SW |
301 | /* |
302 | * Read a range of bytes striped over one or more objects. Iterate over | |
303 | * objects we stripe over. (That's not atomic, but good enough for now.) | |
304 | * | |
305 | * If we get a short result from the OSD, check against i_size; we need to | |
306 | * only return a short read to the caller if we hit EOF. | |
307 | */ | |
308 | static int striped_read(struct inode *inode, | |
309 | u64 off, u64 len, | |
6a026589 | 310 | struct page **pages, int num_pages, |
c3cd6283 | 311 | int *checkeof, bool o_direct, |
ab226e21 | 312 | unsigned long buf_align) |
124e68e7 | 313 | { |
3d14c5d2 | 314 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 | 315 | struct ceph_inode_info *ci = ceph_inode(inode); |
10debbda | 316 | u64 pos, this_len, left; |
b7495fc2 | 317 | int io_align, page_align; |
10debbda | 318 | int pages_left; |
124e68e7 SW |
319 | int read; |
320 | struct page **page_pos; | |
321 | int ret; | |
322 | bool hit_stripe, was_short; | |
323 | ||
324 | /* | |
325 | * we may need to do multiple reads. not atomic, unfortunately. | |
326 | */ | |
327 | pos = off; | |
328 | left = len; | |
329 | page_pos = pages; | |
330 | pages_left = num_pages; | |
331 | read = 0; | |
b7495fc2 | 332 | io_align = off & ~PAGE_MASK; |
124e68e7 SW |
333 | |
334 | more: | |
c3cd6283 | 335 | if (o_direct) |
ab226e21 | 336 | page_align = (pos - io_align + buf_align) & ~PAGE_MASK; |
b7495fc2 SW |
337 | else |
338 | page_align = pos & ~PAGE_MASK; | |
124e68e7 | 339 | this_len = left; |
3d14c5d2 | 340 | ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
124e68e7 SW |
341 | &ci->i_layout, pos, &this_len, |
342 | ci->i_truncate_seq, | |
343 | ci->i_truncate_size, | |
b7495fc2 | 344 | page_pos, pages_left, page_align); |
124e68e7 SW |
345 | if (ret == -ENOENT) |
346 | ret = 0; | |
0e98728f SW |
347 | hit_stripe = this_len < left; |
348 | was_short = ret >= 0 && ret < this_len; | |
10debbda | 349 | dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, |
124e68e7 SW |
350 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); |
351 | ||
533bc295 | 352 | if (ret >= 0) { |
353 | int didpages; | |
354 | if (was_short && (pos + ret < inode->i_size)) { | |
355 | u64 tmp = min(this_len - ret, | |
356 | inode->i_size - pos - ret); | |
357 | dout(" zero gap %llu to %llu\n", | |
358 | pos + ret, pos + ret + tmp); | |
359 | ceph_zero_page_vector_range(page_align + read + ret, | |
360 | tmp, pages); | |
361 | ret += tmp; | |
124e68e7 | 362 | } |
533bc295 | 363 | |
364 | didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; | |
124e68e7 SW |
365 | pos += ret; |
366 | read = pos - off; | |
367 | left -= ret; | |
368 | page_pos += didpages; | |
369 | pages_left -= didpages; | |
370 | ||
533bc295 | 371 | /* hit stripe and need continue*/ |
372 | if (left && hit_stripe && pos < inode->i_size) | |
124e68e7 SW |
373 | goto more; |
374 | } | |
375 | ||
30379f45 | 376 | if (read > 0) { |
533bc295 | 377 | ret = read; |
c3cd6283 SW |
378 | /* did we bounce off eof? */ |
379 | if (pos + left > inode->i_size) | |
380 | *checkeof = 1; | |
124e68e7 SW |
381 | } |
382 | ||
124e68e7 SW |
383 | dout("striped_read returns %d\n", ret); |
384 | return ret; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Completely synchronous read and write methods. Direct from __user | |
389 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
390 | * | |
391 | * If the read spans object boundary, just do multiple reads. | |
392 | */ | |
393 | static ssize_t ceph_sync_read(struct file *file, char __user *data, | |
6a026589 | 394 | unsigned len, loff_t *poff, int *checkeof) |
124e68e7 | 395 | { |
496ad9aa | 396 | struct inode *inode = file_inode(file); |
124e68e7 SW |
397 | struct page **pages; |
398 | u64 off = *poff; | |
ab226e21 | 399 | int num_pages, ret; |
124e68e7 SW |
400 | |
401 | dout("sync_read on file %p %llu~%u %s\n", file, off, len, | |
402 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); | |
403 | ||
ab226e21 HC |
404 | if (file->f_flags & O_DIRECT) { |
405 | num_pages = calc_pages_for((unsigned long)data, len); | |
b6aa5901 | 406 | pages = ceph_get_direct_page_vector(data, num_pages, true); |
ab226e21 HC |
407 | } else { |
408 | num_pages = calc_pages_for(off, len); | |
34d23762 | 409 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
ab226e21 | 410 | } |
124e68e7 SW |
411 | if (IS_ERR(pages)) |
412 | return PTR_ERR(pages); | |
413 | ||
e98b6fed SW |
414 | /* |
415 | * flush any page cache pages in this range. this | |
416 | * will make concurrent normal and sync io slow, | |
417 | * but it will at least behave sensibly when they are | |
418 | * in sequence. | |
419 | */ | |
29065a51 YS |
420 | ret = filemap_write_and_wait(inode->i_mapping); |
421 | if (ret < 0) | |
422 | goto done; | |
423 | ||
b7495fc2 | 424 | ret = striped_read(inode, off, len, pages, num_pages, checkeof, |
ab226e21 HC |
425 | file->f_flags & O_DIRECT, |
426 | (unsigned long)data & ~PAGE_MASK); | |
124e68e7 SW |
427 | |
428 | if (ret >= 0 && (file->f_flags & O_DIRECT) == 0) | |
3d14c5d2 | 429 | ret = ceph_copy_page_vector_to_user(pages, data, off, ret); |
124e68e7 SW |
430 | if (ret >= 0) |
431 | *poff = off + ret; | |
432 | ||
29065a51 | 433 | done: |
124e68e7 | 434 | if (file->f_flags & O_DIRECT) |
b6aa5901 | 435 | ceph_put_page_vector(pages, num_pages, true); |
124e68e7 SW |
436 | else |
437 | ceph_release_page_vector(pages, num_pages); | |
438 | dout("sync_read result %d\n", ret); | |
439 | return ret; | |
440 | } | |
441 | ||
442 | /* | |
26be8808 AE |
443 | * Write commit request unsafe callback, called to tell us when a |
444 | * request is unsafe (that is, in flight--has been handed to the | |
445 | * messenger to send to its target osd). It is called again when | |
446 | * we've received a response message indicating the request is | |
447 | * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request | |
448 | * is completed early (and unsuccessfully) due to a timeout or | |
449 | * interrupt. | |
450 | * | |
451 | * This is used if we requested both an ACK and ONDISK commit reply | |
452 | * from the OSD. | |
124e68e7 | 453 | */ |
26be8808 | 454 | static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) |
124e68e7 SW |
455 | { |
456 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
457 | ||
26be8808 AE |
458 | dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, |
459 | unsafe ? "un" : ""); | |
460 | if (unsafe) { | |
461 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
462 | spin_lock(&ci->i_unsafe_lock); | |
463 | list_add_tail(&req->r_unsafe_item, | |
464 | &ci->i_unsafe_writes); | |
465 | spin_unlock(&ci->i_unsafe_lock); | |
466 | } else { | |
467 | spin_lock(&ci->i_unsafe_lock); | |
468 | list_del_init(&req->r_unsafe_item); | |
469 | spin_unlock(&ci->i_unsafe_lock); | |
470 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
471 | } | |
124e68e7 SW |
472 | } |
473 | ||
474 | /* | |
475 | * Synchronous write, straight from __user pointer or user pages (if | |
476 | * O_DIRECT). | |
477 | * | |
478 | * If write spans object boundary, just do multiple writes. (For a | |
479 | * correct atomic write, we should e.g. take write locks on all | |
480 | * objects, rollback on failure, etc.) | |
481 | */ | |
482 | static ssize_t ceph_sync_write(struct file *file, const char __user *data, | |
03d254ed | 483 | size_t left, loff_t pos, loff_t *ppos) |
124e68e7 | 484 | { |
496ad9aa | 485 | struct inode *inode = file_inode(file); |
124e68e7 | 486 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 487 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
acead002 AE |
488 | struct ceph_snap_context *snapc; |
489 | struct ceph_vino vino; | |
124e68e7 | 490 | struct ceph_osd_request *req; |
acead002 | 491 | int num_ops = 1; |
124e68e7 SW |
492 | struct page **pages; |
493 | int num_pages; | |
124e68e7 SW |
494 | u64 len; |
495 | int written = 0; | |
496 | int flags; | |
124e68e7 | 497 | int check_caps = 0; |
b7495fc2 | 498 | int page_align, io_align; |
ab226e21 | 499 | unsigned long buf_align; |
124e68e7 SW |
500 | int ret; |
501 | struct timespec mtime = CURRENT_TIME; | |
43bfe5de | 502 | bool own_pages = false; |
124e68e7 | 503 | |
496ad9aa | 504 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
124e68e7 SW |
505 | return -EROFS; |
506 | ||
03d254ed | 507 | dout("sync_write on file %p %lld~%u %s\n", file, pos, |
124e68e7 SW |
508 | (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
509 | ||
29065a51 YS |
510 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left); |
511 | if (ret < 0) | |
512 | return ret; | |
513 | ||
514 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
515 | pos >> PAGE_CACHE_SHIFT, | |
516 | (pos + left) >> PAGE_CACHE_SHIFT); | |
517 | if (ret < 0) | |
518 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
519 | ||
124e68e7 SW |
520 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
521 | CEPH_OSD_FLAG_ONDISK | | |
522 | CEPH_OSD_FLAG_WRITE; | |
523 | if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0) | |
524 | flags |= CEPH_OSD_FLAG_ACK; | |
525 | else | |
acead002 | 526 | num_ops++; /* Also include a 'startsync' command. */ |
124e68e7 SW |
527 | |
528 | /* | |
529 | * we may need to do multiple writes here if we span an object | |
530 | * boundary. this isn't atomic, unfortunately. :( | |
531 | */ | |
532 | more: | |
d7f124f1 SW |
533 | io_align = pos & ~PAGE_MASK; |
534 | buf_align = (unsigned long)data & ~PAGE_MASK; | |
124e68e7 | 535 | len = left; |
3a42b6c4 | 536 | |
acead002 AE |
537 | snapc = ci->i_snap_realm->cached_context; |
538 | vino = ceph_vino(inode); | |
3d14c5d2 | 539 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
79528734 | 540 | vino, pos, &len, num_ops, |
acead002 | 541 | CEPH_OSD_OP_WRITE, flags, snapc, |
124e68e7 | 542 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 543 | false); |
6816282d SW |
544 | if (IS_ERR(req)) |
545 | return PTR_ERR(req); | |
124e68e7 | 546 | |
153e5167 AE |
547 | /* write from beginning of first page, regardless of io alignment */ |
548 | page_align = file->f_flags & O_DIRECT ? buf_align : io_align; | |
549 | num_pages = calc_pages_for(page_align, len); | |
124e68e7 | 550 | if (file->f_flags & O_DIRECT) { |
b6aa5901 | 551 | pages = ceph_get_direct_page_vector(data, num_pages, false); |
124e68e7 SW |
552 | if (IS_ERR(pages)) { |
553 | ret = PTR_ERR(pages); | |
554 | goto out; | |
555 | } | |
556 | ||
557 | /* | |
558 | * throw out any page cache pages in this range. this | |
559 | * may block. | |
560 | */ | |
213c99ee | 561 | truncate_inode_pages_range(inode->i_mapping, pos, |
5c6a2cdb | 562 | (pos+len) | (PAGE_CACHE_SIZE-1)); |
124e68e7 | 563 | } else { |
34d23762 | 564 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
124e68e7 SW |
565 | if (IS_ERR(pages)) { |
566 | ret = PTR_ERR(pages); | |
567 | goto out; | |
568 | } | |
3d14c5d2 | 569 | ret = ceph_copy_user_to_page_vector(pages, data, pos, len); |
124e68e7 SW |
570 | if (ret < 0) { |
571 | ceph_release_page_vector(pages, num_pages); | |
572 | goto out; | |
573 | } | |
574 | ||
575 | if ((file->f_flags & O_SYNC) == 0) { | |
576 | /* get a second commit callback */ | |
26be8808 AE |
577 | req->r_unsafe_callback = ceph_sync_write_unsafe; |
578 | req->r_inode = inode; | |
43bfe5de | 579 | own_pages = true; |
124e68e7 SW |
580 | } |
581 | } | |
406e2c9f AE |
582 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align, |
583 | false, own_pages); | |
124e68e7 | 584 | |
02ee07d3 | 585 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ |
79528734 | 586 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); |
02ee07d3 | 587 | |
3d14c5d2 | 588 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
26be8808 | 589 | if (!ret) |
3d14c5d2 | 590 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); |
124e68e7 SW |
591 | |
592 | if (file->f_flags & O_DIRECT) | |
b6aa5901 | 593 | ceph_put_page_vector(pages, num_pages, false); |
124e68e7 SW |
594 | else if (file->f_flags & O_SYNC) |
595 | ceph_release_page_vector(pages, num_pages); | |
596 | ||
597 | out: | |
598 | ceph_osdc_put_request(req); | |
599 | if (ret == 0) { | |
600 | pos += len; | |
601 | written += len; | |
602 | left -= len; | |
022f3e2e | 603 | data += len; |
124e68e7 SW |
604 | if (left) |
605 | goto more; | |
606 | ||
607 | ret = written; | |
03d254ed | 608 | *ppos = pos; |
124e68e7 SW |
609 | if (pos > i_size_read(inode)) |
610 | check_caps = ceph_inode_set_size(inode, pos); | |
611 | if (check_caps) | |
612 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, | |
613 | NULL); | |
30379f45 | 614 | } else if (ret != -EOLDSNAPC && written > 0) { |
615 | ret = written; | |
124e68e7 SW |
616 | } |
617 | return ret; | |
618 | } | |
619 | ||
620 | /* | |
621 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
622 | * Atomically grab references, so that those bits are not released | |
623 | * back to the MDS mid-read. | |
624 | * | |
625 | * Hmm, the sync read case isn't actually async... should it be? | |
626 | */ | |
627 | static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
628 | unsigned long nr_segs, loff_t pos) | |
629 | { | |
630 | struct file *filp = iocb->ki_filp; | |
2962507c | 631 | struct ceph_file_info *fi = filp->private_data; |
124e68e7 SW |
632 | loff_t *ppos = &iocb->ki_pos; |
633 | size_t len = iov->iov_len; | |
496ad9aa | 634 | struct inode *inode = file_inode(filp); |
124e68e7 | 635 | struct ceph_inode_info *ci = ceph_inode(inode); |
cd84db6e | 636 | void __user *base = iov->iov_base; |
124e68e7 | 637 | ssize_t ret; |
2962507c | 638 | int want, got = 0; |
6a026589 | 639 | int checkeof = 0, read = 0; |
124e68e7 SW |
640 | |
641 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", | |
642 | inode, ceph_vinop(inode), pos, (unsigned)len, inode); | |
6a026589 | 643 | again: |
2962507c SW |
644 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
645 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
646 | else | |
647 | want = CEPH_CAP_FILE_CACHE; | |
648 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); | |
124e68e7 SW |
649 | if (ret < 0) |
650 | goto out; | |
651 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
652 | inode, ceph_vinop(inode), pos, (unsigned)len, | |
653 | ceph_cap_string(got)); | |
654 | ||
2962507c | 655 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
124e68e7 | 656 | (iocb->ki_filp->f_flags & O_DIRECT) || |
4918b6d1 SW |
657 | (inode->i_sb->s_flags & MS_SYNCHRONOUS) || |
658 | (fi->flags & CEPH_F_SYNC)) | |
124e68e7 | 659 | /* hmm, this isn't really async... */ |
6a026589 | 660 | ret = ceph_sync_read(filp, base, len, ppos, &checkeof); |
124e68e7 SW |
661 | else |
662 | ret = generic_file_aio_read(iocb, iov, nr_segs, pos); | |
663 | ||
664 | out: | |
665 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", | |
666 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
667 | ceph_put_cap_refs(ci, got); | |
6a026589 SW |
668 | |
669 | if (checkeof && ret >= 0) { | |
670 | int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); | |
671 | ||
672 | /* hit EOF or hole? */ | |
673 | if (statret == 0 && *ppos < inode->i_size) { | |
c3cd6283 | 674 | dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size); |
6a026589 SW |
675 | read += ret; |
676 | base += ret; | |
677 | len -= ret; | |
678 | checkeof = 0; | |
679 | goto again; | |
680 | } | |
681 | } | |
682 | if (ret >= 0) | |
683 | ret += read; | |
684 | ||
124e68e7 SW |
685 | return ret; |
686 | } | |
687 | ||
688 | /* | |
689 | * Take cap references to avoid releasing caps to MDS mid-write. | |
690 | * | |
691 | * If we are synchronous, and write with an old snap context, the OSD | |
692 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
693 | * dropping our cap refs and allowing the pending snap to logically | |
694 | * complete _before_ this write occurs. | |
695 | * | |
696 | * If we are near ENOSPC, write synchronously. | |
697 | */ | |
698 | static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
699 | unsigned long nr_segs, loff_t pos) | |
700 | { | |
701 | struct file *file = iocb->ki_filp; | |
33caad32 | 702 | struct ceph_file_info *fi = file->private_data; |
496ad9aa | 703 | struct inode *inode = file_inode(file); |
124e68e7 | 704 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
705 | struct ceph_osd_client *osdc = |
706 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
03d254ed YZ |
707 | ssize_t count, written = 0; |
708 | int err, want, got; | |
709 | bool hold_mutex; | |
124e68e7 SW |
710 | |
711 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
712 | return -EROFS; | |
713 | ||
6070e0c1 | 714 | sb_start_write(inode->i_sb); |
03d254ed YZ |
715 | mutex_lock(&inode->i_mutex); |
716 | hold_mutex = true; | |
717 | ||
718 | err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ); | |
719 | if (err) | |
720 | goto out; | |
721 | ||
722 | /* We can write back this queue in page reclaim */ | |
723 | current->backing_dev_info = file->f_mapping->backing_dev_info; | |
724 | ||
725 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
726 | if (err) | |
727 | goto out; | |
728 | ||
729 | if (count == 0) | |
730 | goto out; | |
731 | ||
732 | err = file_remove_suid(file); | |
733 | if (err) | |
734 | goto out; | |
735 | ||
736 | err = file_update_time(file); | |
737 | if (err) | |
738 | goto out; | |
739 | ||
124e68e7 | 740 | retry_snap: |
6070e0c1 | 741 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { |
03d254ed | 742 | err = -ENOSPC; |
6070e0c1 YZ |
743 | goto out; |
744 | } | |
03d254ed | 745 | |
ac7f29bf | 746 | dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", |
03d254ed | 747 | inode, ceph_vinop(inode), pos, count, inode->i_size); |
7971bd92 SW |
748 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
749 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
750 | else | |
751 | want = CEPH_CAP_FILE_BUFFER; | |
03d254ed YZ |
752 | got = 0; |
753 | err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count); | |
754 | if (err < 0) | |
37505d57 | 755 | goto out; |
124e68e7 | 756 | |
ac7f29bf | 757 | dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", |
03d254ed | 758 | inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); |
7971bd92 SW |
759 | |
760 | if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || | |
761 | (iocb->ki_filp->f_flags & O_DIRECT) || | |
762 | (inode->i_sb->s_flags & MS_SYNCHRONOUS) || | |
763 | (fi->flags & CEPH_F_SYNC)) { | |
37505d57 | 764 | mutex_unlock(&inode->i_mutex); |
03d254ed YZ |
765 | written = ceph_sync_write(file, iov->iov_base, count, |
766 | pos, &iocb->ki_pos); | |
7971bd92 | 767 | } else { |
03d254ed YZ |
768 | written = generic_file_buffered_write(iocb, iov, nr_segs, |
769 | pos, &iocb->ki_pos, | |
770 | count, 0); | |
6070e0c1 | 771 | mutex_unlock(&inode->i_mutex); |
7971bd92 | 772 | } |
03d254ed | 773 | hold_mutex = false; |
d8de9ab6 | 774 | |
03d254ed | 775 | if (written >= 0) { |
fca65b4a | 776 | int dirty; |
be655596 | 777 | spin_lock(&ci->i_ceph_lock); |
fca65b4a | 778 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); |
be655596 | 779 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
780 | if (dirty) |
781 | __mark_inode_dirty(inode, dirty); | |
124e68e7 | 782 | } |
7971bd92 | 783 | |
124e68e7 | 784 | dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", |
7971bd92 SW |
785 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, |
786 | ceph_cap_string(got)); | |
124e68e7 | 787 | ceph_put_cap_refs(ci, got); |
7971bd92 | 788 | |
03d254ed | 789 | if (written >= 0 && |
6070e0c1 YZ |
790 | ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || |
791 | ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { | |
03d254ed | 792 | err = vfs_fsync_range(file, pos, pos + written - 1, 1); |
6070e0c1 | 793 | if (err < 0) |
03d254ed | 794 | written = err; |
6070e0c1 | 795 | } |
03d254ed YZ |
796 | |
797 | if (written == -EOLDSNAPC) { | |
124e68e7 SW |
798 | dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n", |
799 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len); | |
03d254ed YZ |
800 | mutex_lock(&inode->i_mutex); |
801 | hold_mutex = true; | |
124e68e7 SW |
802 | goto retry_snap; |
803 | } | |
03d254ed YZ |
804 | out: |
805 | if (hold_mutex) | |
806 | mutex_unlock(&inode->i_mutex); | |
6070e0c1 | 807 | sb_end_write(inode->i_sb); |
03d254ed | 808 | current->backing_dev_info = NULL; |
124e68e7 | 809 | |
03d254ed | 810 | return written ? written : err; |
124e68e7 SW |
811 | } |
812 | ||
813 | /* | |
814 | * llseek. be sure to verify file size on SEEK_END. | |
815 | */ | |
965c8e59 | 816 | static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) |
124e68e7 SW |
817 | { |
818 | struct inode *inode = file->f_mapping->host; | |
819 | int ret; | |
820 | ||
821 | mutex_lock(&inode->i_mutex); | |
3f99969f | 822 | __ceph_do_pending_vmtruncate(inode, false); |
6a82c47a | 823 | |
965c8e59 | 824 | if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { |
124e68e7 SW |
825 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); |
826 | if (ret < 0) { | |
827 | offset = ret; | |
828 | goto out; | |
829 | } | |
06222e49 JB |
830 | } |
831 | ||
965c8e59 | 832 | switch (whence) { |
06222e49 | 833 | case SEEK_END: |
124e68e7 SW |
834 | offset += inode->i_size; |
835 | break; | |
836 | case SEEK_CUR: | |
837 | /* | |
838 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
839 | * position-querying operation. Avoid rewriting the "same" | |
840 | * f_pos value back to the file because a concurrent read(), | |
841 | * write() or lseek() might have altered it | |
842 | */ | |
843 | if (offset == 0) { | |
844 | offset = file->f_pos; | |
845 | goto out; | |
846 | } | |
847 | offset += file->f_pos; | |
848 | break; | |
06222e49 JB |
849 | case SEEK_DATA: |
850 | if (offset >= inode->i_size) { | |
851 | ret = -ENXIO; | |
852 | goto out; | |
853 | } | |
854 | break; | |
855 | case SEEK_HOLE: | |
856 | if (offset >= inode->i_size) { | |
857 | ret = -ENXIO; | |
858 | goto out; | |
859 | } | |
860 | offset = inode->i_size; | |
861 | break; | |
124e68e7 SW |
862 | } |
863 | ||
864 | if (offset < 0 || offset > inode->i_sb->s_maxbytes) { | |
865 | offset = -EINVAL; | |
866 | goto out; | |
867 | } | |
868 | ||
869 | /* Special lock needed here? */ | |
870 | if (offset != file->f_pos) { | |
871 | file->f_pos = offset; | |
872 | file->f_version = 0; | |
873 | } | |
874 | ||
875 | out: | |
876 | mutex_unlock(&inode->i_mutex); | |
877 | return offset; | |
878 | } | |
879 | ||
880 | const struct file_operations ceph_file_fops = { | |
881 | .open = ceph_open, | |
882 | .release = ceph_release, | |
883 | .llseek = ceph_llseek, | |
884 | .read = do_sync_read, | |
885 | .write = do_sync_write, | |
886 | .aio_read = ceph_aio_read, | |
887 | .aio_write = ceph_aio_write, | |
888 | .mmap = ceph_mmap, | |
889 | .fsync = ceph_fsync, | |
40819f6f GF |
890 | .lock = ceph_lock, |
891 | .flock = ceph_flock, | |
124e68e7 SW |
892 | .splice_read = generic_file_splice_read, |
893 | .splice_write = generic_file_splice_write, | |
894 | .unlocked_ioctl = ceph_ioctl, | |
895 | .compat_ioctl = ceph_ioctl, | |
896 | }; | |
897 |