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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> | |
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 SW |
315 | struct ceph_inode_info *ci = ceph_inode(inode); |
316 | u64 pos, this_len; | |
b7495fc2 | 317 | int io_align, page_align; |
124e68e7 SW |
318 | int left, pages_left; |
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; | |
124e68e7 SW |
349 | dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read, |
350 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); | |
351 | ||
352 | if (ret > 0) { | |
773e9b44 | 353 | int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; |
124e68e7 SW |
354 | |
355 | if (read < pos - off) { | |
356 | dout(" zero gap %llu to %llu\n", off + read, pos); | |
773e9b44 | 357 | ceph_zero_page_vector_range(page_align + read, |
3d14c5d2 | 358 | pos - off - read, pages); |
124e68e7 SW |
359 | } |
360 | pos += ret; | |
361 | read = pos - off; | |
362 | left -= ret; | |
363 | page_pos += didpages; | |
364 | pages_left -= didpages; | |
365 | ||
366 | /* hit stripe? */ | |
367 | if (left && hit_stripe) | |
368 | goto more; | |
369 | } | |
370 | ||
371 | if (was_short) { | |
c3cd6283 SW |
372 | /* did we bounce off eof? */ |
373 | if (pos + left > inode->i_size) | |
374 | *checkeof = 1; | |
375 | ||
376 | /* zero trailing bytes (inside i_size) */ | |
377 | if (left > 0 && pos < inode->i_size) { | |
378 | if (pos + left > inode->i_size) | |
379 | left = inode->i_size - pos; | |
380 | ||
381 | dout("zero tail %d\n", left); | |
773e9b44 | 382 | ceph_zero_page_vector_range(page_align + read, left, |
3d14c5d2 | 383 | pages); |
c3cd6283 | 384 | read += left; |
124e68e7 | 385 | } |
124e68e7 SW |
386 | } |
387 | ||
124e68e7 SW |
388 | if (ret >= 0) |
389 | ret = read; | |
390 | dout("striped_read returns %d\n", ret); | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Completely synchronous read and write methods. Direct from __user | |
396 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
397 | * | |
398 | * If the read spans object boundary, just do multiple reads. | |
399 | */ | |
400 | static ssize_t ceph_sync_read(struct file *file, char __user *data, | |
6a026589 | 401 | unsigned len, loff_t *poff, int *checkeof) |
124e68e7 | 402 | { |
496ad9aa | 403 | struct inode *inode = file_inode(file); |
124e68e7 SW |
404 | struct page **pages; |
405 | u64 off = *poff; | |
ab226e21 | 406 | int num_pages, ret; |
124e68e7 SW |
407 | |
408 | dout("sync_read on file %p %llu~%u %s\n", file, off, len, | |
409 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); | |
410 | ||
ab226e21 HC |
411 | if (file->f_flags & O_DIRECT) { |
412 | num_pages = calc_pages_for((unsigned long)data, len); | |
b6aa5901 | 413 | pages = ceph_get_direct_page_vector(data, num_pages, true); |
ab226e21 HC |
414 | } else { |
415 | num_pages = calc_pages_for(off, len); | |
34d23762 | 416 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
ab226e21 | 417 | } |
124e68e7 SW |
418 | if (IS_ERR(pages)) |
419 | return PTR_ERR(pages); | |
420 | ||
e98b6fed SW |
421 | /* |
422 | * flush any page cache pages in this range. this | |
423 | * will make concurrent normal and sync io slow, | |
424 | * but it will at least behave sensibly when they are | |
425 | * in sequence. | |
426 | */ | |
29065a51 YS |
427 | ret = filemap_write_and_wait(inode->i_mapping); |
428 | if (ret < 0) | |
429 | goto done; | |
430 | ||
b7495fc2 | 431 | ret = striped_read(inode, off, len, pages, num_pages, checkeof, |
ab226e21 HC |
432 | file->f_flags & O_DIRECT, |
433 | (unsigned long)data & ~PAGE_MASK); | |
124e68e7 SW |
434 | |
435 | if (ret >= 0 && (file->f_flags & O_DIRECT) == 0) | |
3d14c5d2 | 436 | ret = ceph_copy_page_vector_to_user(pages, data, off, ret); |
124e68e7 SW |
437 | if (ret >= 0) |
438 | *poff = off + ret; | |
439 | ||
29065a51 | 440 | done: |
124e68e7 | 441 | if (file->f_flags & O_DIRECT) |
b6aa5901 | 442 | ceph_put_page_vector(pages, num_pages, true); |
124e68e7 SW |
443 | else |
444 | ceph_release_page_vector(pages, num_pages); | |
445 | dout("sync_read result %d\n", ret); | |
446 | return ret; | |
447 | } | |
448 | ||
449 | /* | |
26be8808 AE |
450 | * Write commit request unsafe callback, called to tell us when a |
451 | * request is unsafe (that is, in flight--has been handed to the | |
452 | * messenger to send to its target osd). It is called again when | |
453 | * we've received a response message indicating the request is | |
454 | * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request | |
455 | * is completed early (and unsuccessfully) due to a timeout or | |
456 | * interrupt. | |
457 | * | |
458 | * This is used if we requested both an ACK and ONDISK commit reply | |
459 | * from the OSD. | |
124e68e7 | 460 | */ |
26be8808 | 461 | static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) |
124e68e7 SW |
462 | { |
463 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
464 | ||
26be8808 AE |
465 | dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, |
466 | unsafe ? "un" : ""); | |
467 | if (unsafe) { | |
468 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
469 | spin_lock(&ci->i_unsafe_lock); | |
470 | list_add_tail(&req->r_unsafe_item, | |
471 | &ci->i_unsafe_writes); | |
472 | spin_unlock(&ci->i_unsafe_lock); | |
473 | } else { | |
474 | spin_lock(&ci->i_unsafe_lock); | |
475 | list_del_init(&req->r_unsafe_item); | |
476 | spin_unlock(&ci->i_unsafe_lock); | |
477 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
478 | } | |
124e68e7 SW |
479 | } |
480 | ||
481 | /* | |
482 | * Synchronous write, straight from __user pointer or user pages (if | |
483 | * O_DIRECT). | |
484 | * | |
485 | * If write spans object boundary, just do multiple writes. (For a | |
486 | * correct atomic write, we should e.g. take write locks on all | |
487 | * objects, rollback on failure, etc.) | |
488 | */ | |
489 | static ssize_t ceph_sync_write(struct file *file, const char __user *data, | |
03d254ed | 490 | size_t left, loff_t pos, loff_t *ppos) |
124e68e7 | 491 | { |
496ad9aa | 492 | struct inode *inode = file_inode(file); |
124e68e7 | 493 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 494 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
acead002 AE |
495 | struct ceph_snap_context *snapc; |
496 | struct ceph_vino vino; | |
124e68e7 | 497 | struct ceph_osd_request *req; |
acead002 | 498 | int num_ops = 1; |
124e68e7 SW |
499 | struct page **pages; |
500 | int num_pages; | |
124e68e7 SW |
501 | u64 len; |
502 | int written = 0; | |
503 | int flags; | |
124e68e7 | 504 | int check_caps = 0; |
b7495fc2 | 505 | int page_align, io_align; |
ab226e21 | 506 | unsigned long buf_align; |
124e68e7 SW |
507 | int ret; |
508 | struct timespec mtime = CURRENT_TIME; | |
43bfe5de | 509 | bool own_pages = false; |
124e68e7 | 510 | |
496ad9aa | 511 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
124e68e7 SW |
512 | return -EROFS; |
513 | ||
03d254ed | 514 | dout("sync_write on file %p %lld~%u %s\n", file, pos, |
124e68e7 SW |
515 | (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
516 | ||
29065a51 YS |
517 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left); |
518 | if (ret < 0) | |
519 | return ret; | |
520 | ||
521 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
522 | pos >> PAGE_CACHE_SHIFT, | |
523 | (pos + left) >> PAGE_CACHE_SHIFT); | |
524 | if (ret < 0) | |
525 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
526 | ||
124e68e7 SW |
527 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
528 | CEPH_OSD_FLAG_ONDISK | | |
529 | CEPH_OSD_FLAG_WRITE; | |
530 | if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0) | |
531 | flags |= CEPH_OSD_FLAG_ACK; | |
532 | else | |
acead002 | 533 | num_ops++; /* Also include a 'startsync' command. */ |
124e68e7 SW |
534 | |
535 | /* | |
536 | * we may need to do multiple writes here if we span an object | |
537 | * boundary. this isn't atomic, unfortunately. :( | |
538 | */ | |
539 | more: | |
d7f124f1 SW |
540 | io_align = pos & ~PAGE_MASK; |
541 | buf_align = (unsigned long)data & ~PAGE_MASK; | |
124e68e7 | 542 | len = left; |
3a42b6c4 | 543 | |
acead002 AE |
544 | snapc = ci->i_snap_realm->cached_context; |
545 | vino = ceph_vino(inode); | |
3d14c5d2 | 546 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
79528734 | 547 | vino, pos, &len, num_ops, |
acead002 | 548 | CEPH_OSD_OP_WRITE, flags, snapc, |
124e68e7 | 549 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 550 | false); |
6816282d SW |
551 | if (IS_ERR(req)) |
552 | return PTR_ERR(req); | |
124e68e7 | 553 | |
153e5167 AE |
554 | /* write from beginning of first page, regardless of io alignment */ |
555 | page_align = file->f_flags & O_DIRECT ? buf_align : io_align; | |
556 | num_pages = calc_pages_for(page_align, len); | |
124e68e7 | 557 | if (file->f_flags & O_DIRECT) { |
b6aa5901 | 558 | pages = ceph_get_direct_page_vector(data, num_pages, false); |
124e68e7 SW |
559 | if (IS_ERR(pages)) { |
560 | ret = PTR_ERR(pages); | |
561 | goto out; | |
562 | } | |
563 | ||
564 | /* | |
565 | * throw out any page cache pages in this range. this | |
566 | * may block. | |
567 | */ | |
213c99ee | 568 | truncate_inode_pages_range(inode->i_mapping, pos, |
5c6a2cdb | 569 | (pos+len) | (PAGE_CACHE_SIZE-1)); |
124e68e7 | 570 | } else { |
34d23762 | 571 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
124e68e7 SW |
572 | if (IS_ERR(pages)) { |
573 | ret = PTR_ERR(pages); | |
574 | goto out; | |
575 | } | |
3d14c5d2 | 576 | ret = ceph_copy_user_to_page_vector(pages, data, pos, len); |
124e68e7 SW |
577 | if (ret < 0) { |
578 | ceph_release_page_vector(pages, num_pages); | |
579 | goto out; | |
580 | } | |
581 | ||
582 | if ((file->f_flags & O_SYNC) == 0) { | |
583 | /* get a second commit callback */ | |
26be8808 AE |
584 | req->r_unsafe_callback = ceph_sync_write_unsafe; |
585 | req->r_inode = inode; | |
43bfe5de | 586 | own_pages = true; |
124e68e7 SW |
587 | } |
588 | } | |
406e2c9f AE |
589 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align, |
590 | false, own_pages); | |
124e68e7 | 591 | |
02ee07d3 | 592 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ |
79528734 | 593 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); |
02ee07d3 | 594 | |
3d14c5d2 | 595 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
26be8808 | 596 | if (!ret) |
3d14c5d2 | 597 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); |
124e68e7 SW |
598 | |
599 | if (file->f_flags & O_DIRECT) | |
b6aa5901 | 600 | ceph_put_page_vector(pages, num_pages, false); |
124e68e7 SW |
601 | else if (file->f_flags & O_SYNC) |
602 | ceph_release_page_vector(pages, num_pages); | |
603 | ||
604 | out: | |
605 | ceph_osdc_put_request(req); | |
606 | if (ret == 0) { | |
607 | pos += len; | |
608 | written += len; | |
609 | left -= len; | |
022f3e2e | 610 | data += len; |
124e68e7 SW |
611 | if (left) |
612 | goto more; | |
613 | ||
614 | ret = written; | |
03d254ed | 615 | *ppos = pos; |
124e68e7 SW |
616 | if (pos > i_size_read(inode)) |
617 | check_caps = ceph_inode_set_size(inode, pos); | |
618 | if (check_caps) | |
619 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, | |
620 | NULL); | |
621 | } | |
622 | return ret; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
627 | * Atomically grab references, so that those bits are not released | |
628 | * back to the MDS mid-read. | |
629 | * | |
630 | * Hmm, the sync read case isn't actually async... should it be? | |
631 | */ | |
632 | static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
633 | unsigned long nr_segs, loff_t pos) | |
634 | { | |
635 | struct file *filp = iocb->ki_filp; | |
2962507c | 636 | struct ceph_file_info *fi = filp->private_data; |
124e68e7 SW |
637 | loff_t *ppos = &iocb->ki_pos; |
638 | size_t len = iov->iov_len; | |
496ad9aa | 639 | struct inode *inode = file_inode(filp); |
124e68e7 | 640 | struct ceph_inode_info *ci = ceph_inode(inode); |
cd84db6e | 641 | void __user *base = iov->iov_base; |
124e68e7 | 642 | ssize_t ret; |
2962507c | 643 | int want, got = 0; |
6a026589 | 644 | int checkeof = 0, read = 0; |
124e68e7 SW |
645 | |
646 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", | |
647 | inode, ceph_vinop(inode), pos, (unsigned)len, inode); | |
6a026589 | 648 | again: |
2962507c SW |
649 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
650 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
651 | else | |
652 | want = CEPH_CAP_FILE_CACHE; | |
653 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); | |
124e68e7 SW |
654 | if (ret < 0) |
655 | goto out; | |
656 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
657 | inode, ceph_vinop(inode), pos, (unsigned)len, | |
658 | ceph_cap_string(got)); | |
659 | ||
2962507c | 660 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
124e68e7 | 661 | (iocb->ki_filp->f_flags & O_DIRECT) || |
4918b6d1 SW |
662 | (inode->i_sb->s_flags & MS_SYNCHRONOUS) || |
663 | (fi->flags & CEPH_F_SYNC)) | |
124e68e7 | 664 | /* hmm, this isn't really async... */ |
6a026589 | 665 | ret = ceph_sync_read(filp, base, len, ppos, &checkeof); |
124e68e7 SW |
666 | else |
667 | ret = generic_file_aio_read(iocb, iov, nr_segs, pos); | |
668 | ||
669 | out: | |
670 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", | |
671 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
672 | ceph_put_cap_refs(ci, got); | |
6a026589 SW |
673 | |
674 | if (checkeof && ret >= 0) { | |
675 | int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); | |
676 | ||
677 | /* hit EOF or hole? */ | |
678 | if (statret == 0 && *ppos < inode->i_size) { | |
c3cd6283 | 679 | dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size); |
6a026589 SW |
680 | read += ret; |
681 | base += ret; | |
682 | len -= ret; | |
683 | checkeof = 0; | |
684 | goto again; | |
685 | } | |
686 | } | |
687 | if (ret >= 0) | |
688 | ret += read; | |
689 | ||
124e68e7 SW |
690 | return ret; |
691 | } | |
692 | ||
693 | /* | |
694 | * Take cap references to avoid releasing caps to MDS mid-write. | |
695 | * | |
696 | * If we are synchronous, and write with an old snap context, the OSD | |
697 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
698 | * dropping our cap refs and allowing the pending snap to logically | |
699 | * complete _before_ this write occurs. | |
700 | * | |
701 | * If we are near ENOSPC, write synchronously. | |
702 | */ | |
703 | static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
704 | unsigned long nr_segs, loff_t pos) | |
705 | { | |
706 | struct file *file = iocb->ki_filp; | |
33caad32 | 707 | struct ceph_file_info *fi = file->private_data; |
496ad9aa | 708 | struct inode *inode = file_inode(file); |
124e68e7 | 709 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
710 | struct ceph_osd_client *osdc = |
711 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
03d254ed YZ |
712 | ssize_t count, written = 0; |
713 | int err, want, got; | |
714 | bool hold_mutex; | |
124e68e7 SW |
715 | |
716 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
717 | return -EROFS; | |
718 | ||
03d254ed YZ |
719 | mutex_lock(&inode->i_mutex); |
720 | hold_mutex = true; | |
721 | ||
722 | err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ); | |
723 | if (err) | |
724 | goto out; | |
725 | ||
726 | /* We can write back this queue in page reclaim */ | |
727 | current->backing_dev_info = file->f_mapping->backing_dev_info; | |
728 | ||
729 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
730 | if (err) | |
731 | goto out; | |
732 | ||
733 | if (count == 0) | |
734 | goto out; | |
735 | ||
736 | err = file_remove_suid(file); | |
737 | if (err) | |
738 | goto out; | |
739 | ||
740 | err = file_update_time(file); | |
741 | if (err) | |
742 | goto out; | |
743 | ||
124e68e7 | 744 | retry_snap: |
6070e0c1 | 745 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { |
03d254ed | 746 | err = -ENOSPC; |
6070e0c1 YZ |
747 | goto out; |
748 | } | |
03d254ed | 749 | |
ac7f29bf | 750 | dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", |
03d254ed | 751 | inode, ceph_vinop(inode), pos, count, inode->i_size); |
7971bd92 SW |
752 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
753 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
754 | else | |
755 | want = CEPH_CAP_FILE_BUFFER; | |
03d254ed YZ |
756 | got = 0; |
757 | err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count); | |
758 | if (err < 0) | |
37505d57 | 759 | goto out; |
124e68e7 | 760 | |
ac7f29bf | 761 | dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", |
03d254ed | 762 | inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); |
7971bd92 SW |
763 | |
764 | if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || | |
765 | (iocb->ki_filp->f_flags & O_DIRECT) || | |
766 | (inode->i_sb->s_flags & MS_SYNCHRONOUS) || | |
767 | (fi->flags & CEPH_F_SYNC)) { | |
37505d57 | 768 | mutex_unlock(&inode->i_mutex); |
03d254ed YZ |
769 | written = ceph_sync_write(file, iov->iov_base, count, |
770 | pos, &iocb->ki_pos); | |
7971bd92 | 771 | } else { |
03d254ed YZ |
772 | written = generic_file_buffered_write(iocb, iov, nr_segs, |
773 | pos, &iocb->ki_pos, | |
774 | count, 0); | |
6070e0c1 | 775 | mutex_unlock(&inode->i_mutex); |
7971bd92 | 776 | } |
03d254ed | 777 | hold_mutex = false; |
d8de9ab6 | 778 | |
03d254ed | 779 | if (written >= 0) { |
fca65b4a | 780 | int dirty; |
be655596 | 781 | spin_lock(&ci->i_ceph_lock); |
fca65b4a | 782 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); |
be655596 | 783 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
784 | if (dirty) |
785 | __mark_inode_dirty(inode, dirty); | |
124e68e7 | 786 | } |
7971bd92 | 787 | |
124e68e7 | 788 | dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", |
7971bd92 SW |
789 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, |
790 | ceph_cap_string(got)); | |
124e68e7 | 791 | ceph_put_cap_refs(ci, got); |
7971bd92 | 792 | |
03d254ed | 793 | if (written >= 0 && |
6070e0c1 YZ |
794 | ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || |
795 | ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { | |
03d254ed | 796 | err = vfs_fsync_range(file, pos, pos + written - 1, 1); |
6070e0c1 | 797 | if (err < 0) |
03d254ed | 798 | written = err; |
6070e0c1 | 799 | } |
03d254ed YZ |
800 | |
801 | if (written == -EOLDSNAPC) { | |
124e68e7 SW |
802 | dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n", |
803 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len); | |
03d254ed YZ |
804 | mutex_lock(&inode->i_mutex); |
805 | hold_mutex = true; | |
124e68e7 SW |
806 | goto retry_snap; |
807 | } | |
03d254ed YZ |
808 | out: |
809 | if (hold_mutex) | |
810 | mutex_unlock(&inode->i_mutex); | |
03d254ed | 811 | current->backing_dev_info = NULL; |
124e68e7 | 812 | |
03d254ed | 813 | return written ? written : err; |
124e68e7 SW |
814 | } |
815 | ||
816 | /* | |
817 | * llseek. be sure to verify file size on SEEK_END. | |
818 | */ | |
965c8e59 | 819 | static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) |
124e68e7 SW |
820 | { |
821 | struct inode *inode = file->f_mapping->host; | |
822 | int ret; | |
823 | ||
824 | mutex_lock(&inode->i_mutex); | |
3f99969f | 825 | __ceph_do_pending_vmtruncate(inode, false); |
6a82c47a | 826 | |
965c8e59 | 827 | if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { |
124e68e7 SW |
828 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); |
829 | if (ret < 0) { | |
830 | offset = ret; | |
831 | goto out; | |
832 | } | |
06222e49 JB |
833 | } |
834 | ||
965c8e59 | 835 | switch (whence) { |
06222e49 | 836 | case SEEK_END: |
124e68e7 SW |
837 | offset += inode->i_size; |
838 | break; | |
839 | case SEEK_CUR: | |
840 | /* | |
841 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
842 | * position-querying operation. Avoid rewriting the "same" | |
843 | * f_pos value back to the file because a concurrent read(), | |
844 | * write() or lseek() might have altered it | |
845 | */ | |
846 | if (offset == 0) { | |
847 | offset = file->f_pos; | |
848 | goto out; | |
849 | } | |
850 | offset += file->f_pos; | |
851 | break; | |
06222e49 JB |
852 | case SEEK_DATA: |
853 | if (offset >= inode->i_size) { | |
854 | ret = -ENXIO; | |
855 | goto out; | |
856 | } | |
857 | break; | |
858 | case SEEK_HOLE: | |
859 | if (offset >= inode->i_size) { | |
860 | ret = -ENXIO; | |
861 | goto out; | |
862 | } | |
863 | offset = inode->i_size; | |
864 | break; | |
124e68e7 SW |
865 | } |
866 | ||
867 | if (offset < 0 || offset > inode->i_sb->s_maxbytes) { | |
868 | offset = -EINVAL; | |
869 | goto out; | |
870 | } | |
871 | ||
872 | /* Special lock needed here? */ | |
873 | if (offset != file->f_pos) { | |
874 | file->f_pos = offset; | |
875 | file->f_version = 0; | |
876 | } | |
877 | ||
878 | out: | |
879 | mutex_unlock(&inode->i_mutex); | |
880 | return offset; | |
881 | } | |
882 | ||
883 | const struct file_operations ceph_file_fops = { | |
884 | .open = ceph_open, | |
885 | .release = ceph_release, | |
886 | .llseek = ceph_llseek, | |
887 | .read = do_sync_read, | |
888 | .write = do_sync_write, | |
889 | .aio_read = ceph_aio_read, | |
890 | .aio_write = ceph_aio_write, | |
891 | .mmap = ceph_mmap, | |
892 | .fsync = ceph_fsync, | |
40819f6f GF |
893 | .lock = ceph_lock, |
894 | .flock = ceph_flock, | |
124e68e7 SW |
895 | .splice_read = generic_file_splice_read, |
896 | .splice_write = generic_file_splice_write, | |
897 | .unlocked_ioctl = ceph_ioctl, | |
898 | .compat_ioctl = ceph_ioctl, | |
899 | }; | |
900 |