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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> | |
10 | ||
11 | #include "super.h" | |
12 | #include "mds_client.h" | |
13 | ||
14 | /* | |
15 | * Ceph file operations | |
16 | * | |
17 | * Implement basic open/close functionality, and implement | |
18 | * read/write. | |
19 | * | |
20 | * We implement three modes of file I/O: | |
21 | * - buffered uses the generic_file_aio_{read,write} helpers | |
22 | * | |
23 | * - synchronous is used when there is multi-client read/write | |
24 | * sharing, avoids the page cache, and synchronously waits for an | |
25 | * ack from the OSD. | |
26 | * | |
27 | * - direct io takes the variant of the sync path that references | |
28 | * user pages directly. | |
29 | * | |
30 | * fsync() flushes and waits on dirty pages, but just queues metadata | |
31 | * for writeback: since the MDS can recover size and mtime there is no | |
32 | * need to wait for MDS acknowledgement. | |
33 | */ | |
34 | ||
35 | ||
36 | /* | |
37 | * Prepare an open request. Preallocate ceph_cap to avoid an | |
38 | * inopportune ENOMEM later. | |
39 | */ | |
40 | static struct ceph_mds_request * | |
41 | prepare_open_request(struct super_block *sb, int flags, int create_mode) | |
42 | { | |
3d14c5d2 YS |
43 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
44 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
45 | struct ceph_mds_request *req; |
46 | int want_auth = USE_ANY_MDS; | |
47 | int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; | |
48 | ||
49 | if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) | |
50 | want_auth = USE_AUTH_MDS; | |
51 | ||
52 | req = ceph_mdsc_create_request(mdsc, op, want_auth); | |
53 | if (IS_ERR(req)) | |
54 | goto out; | |
55 | req->r_fmode = ceph_flags_to_mode(flags); | |
56 | req->r_args.open.flags = cpu_to_le32(flags); | |
57 | req->r_args.open.mode = cpu_to_le32(create_mode); | |
124e68e7 SW |
58 | out: |
59 | return req; | |
60 | } | |
61 | ||
62 | /* | |
63 | * initialize private struct file data. | |
64 | * if we fail, clean up by dropping fmode reference on the ceph_inode | |
65 | */ | |
66 | static int ceph_init_file(struct inode *inode, struct file *file, int fmode) | |
67 | { | |
68 | struct ceph_file_info *cf; | |
69 | int ret = 0; | |
70 | ||
71 | switch (inode->i_mode & S_IFMT) { | |
72 | case S_IFREG: | |
73 | case S_IFDIR: | |
74 | dout("init_file %p %p 0%o (regular)\n", inode, file, | |
75 | inode->i_mode); | |
76 | cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO); | |
77 | if (cf == NULL) { | |
78 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
79 | return -ENOMEM; | |
80 | } | |
81 | cf->fmode = fmode; | |
82 | cf->next_offset = 2; | |
83 | file->private_data = cf; | |
84 | BUG_ON(inode->i_fop->release != ceph_release); | |
85 | break; | |
86 | ||
87 | case S_IFLNK: | |
88 | dout("init_file %p %p 0%o (symlink)\n", inode, file, | |
89 | inode->i_mode); | |
90 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
91 | break; | |
92 | ||
93 | default: | |
94 | dout("init_file %p %p 0%o (special)\n", inode, file, | |
95 | inode->i_mode); | |
96 | /* | |
97 | * we need to drop the open ref now, since we don't | |
98 | * have .release set to ceph_release. | |
99 | */ | |
100 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
101 | BUG_ON(inode->i_fop->release == ceph_release); | |
102 | ||
103 | /* call the proper open fop */ | |
104 | ret = inode->i_fop->open(inode, file); | |
105 | } | |
106 | return ret; | |
107 | } | |
108 | ||
109 | /* | |
124e68e7 SW |
110 | * If we already have the requisite capabilities, we can satisfy |
111 | * the open request locally (no need to request new caps from the | |
112 | * MDS). We do, however, need to inform the MDS (asynchronously) | |
113 | * if our wanted caps set expands. | |
114 | */ | |
115 | int ceph_open(struct inode *inode, struct file *file) | |
116 | { | |
117 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 YS |
118 | struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); |
119 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
120 | struct ceph_mds_request *req; |
121 | struct ceph_file_info *cf = file->private_data; | |
5f21c96d | 122 | struct inode *parent_inode = NULL; |
124e68e7 SW |
123 | int err; |
124 | int flags, fmode, wanted; | |
125 | ||
126 | if (cf) { | |
127 | dout("open file %p is already opened\n", file); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ | |
132 | flags = file->f_flags & ~(O_CREAT|O_EXCL); | |
133 | if (S_ISDIR(inode->i_mode)) | |
134 | flags = O_DIRECTORY; /* mds likes to know */ | |
135 | ||
136 | dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, | |
137 | ceph_vinop(inode), file, flags, file->f_flags); | |
138 | fmode = ceph_flags_to_mode(flags); | |
139 | wanted = ceph_caps_for_mode(fmode); | |
140 | ||
141 | /* snapped files are read-only */ | |
142 | if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) | |
143 | return -EROFS; | |
144 | ||
145 | /* trivially open snapdir */ | |
146 | if (ceph_snap(inode) == CEPH_SNAPDIR) { | |
be655596 | 147 | spin_lock(&ci->i_ceph_lock); |
124e68e7 | 148 | __ceph_get_fmode(ci, fmode); |
be655596 | 149 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
150 | return ceph_init_file(inode, file, fmode); |
151 | } | |
152 | ||
153 | /* | |
7421ab80 SW |
154 | * No need to block if we have caps on the auth MDS (for |
155 | * write) or any MDS (for read). Update wanted set | |
124e68e7 SW |
156 | * asynchronously. |
157 | */ | |
be655596 | 158 | spin_lock(&ci->i_ceph_lock); |
7421ab80 SW |
159 | if (__ceph_is_any_real_caps(ci) && |
160 | (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { | |
124e68e7 SW |
161 | int mds_wanted = __ceph_caps_mds_wanted(ci); |
162 | int issued = __ceph_caps_issued(ci, NULL); | |
163 | ||
164 | dout("open %p fmode %d want %s issued %s using existing\n", | |
165 | inode, fmode, ceph_cap_string(wanted), | |
166 | ceph_cap_string(issued)); | |
167 | __ceph_get_fmode(ci, fmode); | |
be655596 | 168 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
169 | |
170 | /* adjust wanted? */ | |
171 | if ((issued & wanted) != wanted && | |
172 | (mds_wanted & wanted) != wanted && | |
173 | ceph_snap(inode) != CEPH_SNAPDIR) | |
174 | ceph_check_caps(ci, 0, NULL); | |
175 | ||
176 | return ceph_init_file(inode, file, fmode); | |
177 | } else if (ceph_snap(inode) != CEPH_NOSNAP && | |
178 | (ci->i_snap_caps & wanted) == wanted) { | |
179 | __ceph_get_fmode(ci, fmode); | |
be655596 | 180 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
181 | return ceph_init_file(inode, file, fmode); |
182 | } | |
be655596 | 183 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
184 | |
185 | dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); | |
186 | req = prepare_open_request(inode->i_sb, flags, 0); | |
187 | if (IS_ERR(req)) { | |
188 | err = PTR_ERR(req); | |
189 | goto out; | |
190 | } | |
70b666c3 SW |
191 | req->r_inode = inode; |
192 | ihold(inode); | |
124e68e7 | 193 | req->r_num_caps = 1; |
5f21c96d SW |
194 | if (flags & (O_CREAT|O_TRUNC)) |
195 | parent_inode = ceph_get_dentry_parent_inode(file->f_dentry); | |
124e68e7 | 196 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); |
5f21c96d | 197 | iput(parent_inode); |
124e68e7 SW |
198 | if (!err) |
199 | err = ceph_init_file(inode, file, req->r_fmode); | |
200 | ceph_mdsc_put_request(req); | |
201 | dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); | |
202 | out: | |
203 | return err; | |
204 | } | |
205 | ||
206 | ||
207 | /* | |
5ef50c3b SW |
208 | * Do a lookup + open with a single request. If we get a non-existent |
209 | * file or symlink, return 1 so the VFS can retry. | |
124e68e7 | 210 | */ |
5ef50c3b | 211 | int ceph_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 212 | struct file *file, unsigned flags, umode_t mode, |
d9585277 | 213 | int *opened) |
124e68e7 | 214 | { |
3d14c5d2 YS |
215 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
216 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 | 217 | struct ceph_mds_request *req; |
5ef50c3b | 218 | struct dentry *dn; |
124e68e7 | 219 | int err; |
124e68e7 | 220 | |
5ef50c3b SW |
221 | dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n", |
222 | dir, dentry, dentry->d_name.len, dentry->d_name.name, | |
223 | d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); | |
224 | ||
225 | if (dentry->d_name.len > NAME_MAX) | |
226 | return -ENAMETOOLONG; | |
227 | ||
228 | err = ceph_init_dentry(dentry); | |
229 | if (err < 0) | |
230 | return err; | |
124e68e7 SW |
231 | |
232 | /* do the open */ | |
233 | req = prepare_open_request(dir->i_sb, flags, mode); | |
234 | if (IS_ERR(req)) | |
d9585277 | 235 | return PTR_ERR(req); |
124e68e7 SW |
236 | req->r_dentry = dget(dentry); |
237 | req->r_num_caps = 2; | |
238 | if (flags & O_CREAT) { | |
239 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
240 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
241 | } | |
242 | req->r_locked_dir = dir; /* caller holds dir->i_mutex */ | |
acda7657 SW |
243 | err = ceph_mdsc_do_request(mdsc, |
244 | (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, | |
245 | req); | |
79aec984 SL |
246 | if (err) |
247 | goto out_err; | |
248 | ||
468640e3 | 249 | err = ceph_handle_snapdir(req, dentry, err); |
5ef50c3b | 250 | if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) |
124e68e7 | 251 | err = ceph_handle_notrace_create(dir, dentry); |
2d83bde9 | 252 | |
5ef50c3b SW |
253 | if (d_unhashed(dentry)) { |
254 | dn = ceph_finish_lookup(req, dentry, err); | |
255 | if (IS_ERR(dn)) | |
256 | err = PTR_ERR(dn); | |
257 | } else { | |
258 | /* we were given a hashed negative dentry */ | |
259 | dn = NULL; | |
260 | } | |
261 | if (err) | |
262 | goto out_err; | |
263 | if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) { | |
264 | /* make vfs retry on splice, ENOENT, or symlink */ | |
265 | dout("atomic_open finish_no_open on dn %p\n", dn); | |
266 | err = finish_no_open(file, dn); | |
267 | } else { | |
268 | dout("atomic_open finish_open on dn %p\n", dn); | |
6e8575fa SL |
269 | if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { |
270 | *opened |= FILE_CREATED; | |
271 | } | |
5ef50c3b SW |
272 | err = finish_open(file, dentry, ceph_open, opened); |
273 | } | |
2d83bde9 | 274 | |
5ef50c3b SW |
275 | out_err: |
276 | ceph_mdsc_put_request(req); | |
277 | dout("atomic_open result=%d\n", err); | |
d9585277 | 278 | return err; |
124e68e7 SW |
279 | } |
280 | ||
281 | int ceph_release(struct inode *inode, struct file *file) | |
282 | { | |
283 | struct ceph_inode_info *ci = ceph_inode(inode); | |
284 | struct ceph_file_info *cf = file->private_data; | |
285 | ||
286 | dout("release inode %p file %p\n", inode, file); | |
287 | ceph_put_fmode(ci, cf->fmode); | |
288 | if (cf->last_readdir) | |
289 | ceph_mdsc_put_request(cf->last_readdir); | |
290 | kfree(cf->last_name); | |
291 | kfree(cf->dir_info); | |
292 | dput(cf->dentry); | |
293 | kmem_cache_free(ceph_file_cachep, cf); | |
195d3ce2 SW |
294 | |
295 | /* wake up anyone waiting for caps on this inode */ | |
03066f23 | 296 | wake_up_all(&ci->i_cap_wq); |
124e68e7 SW |
297 | return 0; |
298 | } | |
299 | ||
124e68e7 SW |
300 | /* |
301 | * Read a range of bytes striped over one or more objects. Iterate over | |
302 | * objects we stripe over. (That's not atomic, but good enough for now.) | |
303 | * | |
304 | * If we get a short result from the OSD, check against i_size; we need to | |
305 | * only return a short read to the caller if we hit EOF. | |
306 | */ | |
307 | static int striped_read(struct inode *inode, | |
308 | u64 off, u64 len, | |
6a026589 | 309 | struct page **pages, int num_pages, |
c3cd6283 | 310 | int *checkeof, bool o_direct, |
ab226e21 | 311 | unsigned long buf_align) |
124e68e7 | 312 | { |
3d14c5d2 | 313 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 SW |
314 | struct ceph_inode_info *ci = ceph_inode(inode); |
315 | u64 pos, this_len; | |
b7495fc2 | 316 | int io_align, page_align; |
124e68e7 SW |
317 | int left, pages_left; |
318 | int read; | |
319 | struct page **page_pos; | |
320 | int ret; | |
321 | bool hit_stripe, was_short; | |
322 | ||
323 | /* | |
324 | * we may need to do multiple reads. not atomic, unfortunately. | |
325 | */ | |
326 | pos = off; | |
327 | left = len; | |
328 | page_pos = pages; | |
329 | pages_left = num_pages; | |
330 | read = 0; | |
b7495fc2 | 331 | io_align = off & ~PAGE_MASK; |
124e68e7 SW |
332 | |
333 | more: | |
c3cd6283 | 334 | if (o_direct) |
ab226e21 | 335 | page_align = (pos - io_align + buf_align) & ~PAGE_MASK; |
b7495fc2 SW |
336 | else |
337 | page_align = pos & ~PAGE_MASK; | |
124e68e7 | 338 | this_len = left; |
3d14c5d2 | 339 | ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
124e68e7 SW |
340 | &ci->i_layout, pos, &this_len, |
341 | ci->i_truncate_seq, | |
342 | ci->i_truncate_size, | |
b7495fc2 | 343 | page_pos, pages_left, page_align); |
124e68e7 SW |
344 | if (ret == -ENOENT) |
345 | ret = 0; | |
0e98728f SW |
346 | hit_stripe = this_len < left; |
347 | was_short = ret >= 0 && ret < this_len; | |
124e68e7 SW |
348 | dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read, |
349 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); | |
350 | ||
351 | if (ret > 0) { | |
773e9b44 | 352 | int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; |
124e68e7 SW |
353 | |
354 | if (read < pos - off) { | |
355 | dout(" zero gap %llu to %llu\n", off + read, pos); | |
773e9b44 | 356 | ceph_zero_page_vector_range(page_align + read, |
3d14c5d2 | 357 | pos - off - read, pages); |
124e68e7 SW |
358 | } |
359 | pos += ret; | |
360 | read = pos - off; | |
361 | left -= ret; | |
362 | page_pos += didpages; | |
363 | pages_left -= didpages; | |
364 | ||
365 | /* hit stripe? */ | |
366 | if (left && hit_stripe) | |
367 | goto more; | |
368 | } | |
369 | ||
370 | if (was_short) { | |
c3cd6283 SW |
371 | /* did we bounce off eof? */ |
372 | if (pos + left > inode->i_size) | |
373 | *checkeof = 1; | |
374 | ||
375 | /* zero trailing bytes (inside i_size) */ | |
376 | if (left > 0 && pos < inode->i_size) { | |
377 | if (pos + left > inode->i_size) | |
378 | left = inode->i_size - pos; | |
379 | ||
380 | dout("zero tail %d\n", left); | |
773e9b44 | 381 | ceph_zero_page_vector_range(page_align + read, left, |
3d14c5d2 | 382 | pages); |
c3cd6283 | 383 | read += left; |
124e68e7 | 384 | } |
124e68e7 SW |
385 | } |
386 | ||
124e68e7 SW |
387 | if (ret >= 0) |
388 | ret = read; | |
389 | dout("striped_read returns %d\n", ret); | |
390 | return ret; | |
391 | } | |
392 | ||
393 | /* | |
394 | * Completely synchronous read and write methods. Direct from __user | |
395 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
396 | * | |
397 | * If the read spans object boundary, just do multiple reads. | |
398 | */ | |
399 | static ssize_t ceph_sync_read(struct file *file, char __user *data, | |
6a026589 | 400 | unsigned len, loff_t *poff, int *checkeof) |
124e68e7 | 401 | { |
496ad9aa | 402 | struct inode *inode = file_inode(file); |
124e68e7 SW |
403 | struct page **pages; |
404 | u64 off = *poff; | |
ab226e21 | 405 | int num_pages, ret; |
124e68e7 SW |
406 | |
407 | dout("sync_read on file %p %llu~%u %s\n", file, off, len, | |
408 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); | |
409 | ||
ab226e21 HC |
410 | if (file->f_flags & O_DIRECT) { |
411 | num_pages = calc_pages_for((unsigned long)data, len); | |
b6aa5901 | 412 | pages = ceph_get_direct_page_vector(data, num_pages, true); |
ab226e21 HC |
413 | } else { |
414 | num_pages = calc_pages_for(off, len); | |
34d23762 | 415 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
ab226e21 | 416 | } |
124e68e7 SW |
417 | if (IS_ERR(pages)) |
418 | return PTR_ERR(pages); | |
419 | ||
e98b6fed SW |
420 | /* |
421 | * flush any page cache pages in this range. this | |
422 | * will make concurrent normal and sync io slow, | |
423 | * but it will at least behave sensibly when they are | |
424 | * in sequence. | |
425 | */ | |
29065a51 YS |
426 | ret = filemap_write_and_wait(inode->i_mapping); |
427 | if (ret < 0) | |
428 | goto done; | |
429 | ||
b7495fc2 | 430 | ret = striped_read(inode, off, len, pages, num_pages, checkeof, |
ab226e21 HC |
431 | file->f_flags & O_DIRECT, |
432 | (unsigned long)data & ~PAGE_MASK); | |
124e68e7 SW |
433 | |
434 | if (ret >= 0 && (file->f_flags & O_DIRECT) == 0) | |
3d14c5d2 | 435 | ret = ceph_copy_page_vector_to_user(pages, data, off, ret); |
124e68e7 SW |
436 | if (ret >= 0) |
437 | *poff = off + ret; | |
438 | ||
29065a51 | 439 | done: |
124e68e7 | 440 | if (file->f_flags & O_DIRECT) |
b6aa5901 | 441 | ceph_put_page_vector(pages, num_pages, true); |
124e68e7 SW |
442 | else |
443 | ceph_release_page_vector(pages, num_pages); | |
444 | dout("sync_read result %d\n", ret); | |
445 | return ret; | |
446 | } | |
447 | ||
448 | /* | |
26be8808 AE |
449 | * Write commit request unsafe callback, called to tell us when a |
450 | * request is unsafe (that is, in flight--has been handed to the | |
451 | * messenger to send to its target osd). It is called again when | |
452 | * we've received a response message indicating the request is | |
453 | * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request | |
454 | * is completed early (and unsuccessfully) due to a timeout or | |
455 | * interrupt. | |
456 | * | |
457 | * This is used if we requested both an ACK and ONDISK commit reply | |
458 | * from the OSD. | |
124e68e7 | 459 | */ |
26be8808 | 460 | static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) |
124e68e7 SW |
461 | { |
462 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
463 | ||
26be8808 AE |
464 | dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, |
465 | unsafe ? "un" : ""); | |
466 | if (unsafe) { | |
467 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
468 | spin_lock(&ci->i_unsafe_lock); | |
469 | list_add_tail(&req->r_unsafe_item, | |
470 | &ci->i_unsafe_writes); | |
471 | spin_unlock(&ci->i_unsafe_lock); | |
472 | } else { | |
473 | spin_lock(&ci->i_unsafe_lock); | |
474 | list_del_init(&req->r_unsafe_item); | |
475 | spin_unlock(&ci->i_unsafe_lock); | |
476 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
477 | } | |
124e68e7 SW |
478 | } |
479 | ||
480 | /* | |
481 | * Synchronous write, straight from __user pointer or user pages (if | |
482 | * O_DIRECT). | |
483 | * | |
484 | * If write spans object boundary, just do multiple writes. (For a | |
485 | * correct atomic write, we should e.g. take write locks on all | |
486 | * objects, rollback on failure, etc.) | |
487 | */ | |
488 | static ssize_t ceph_sync_write(struct file *file, const char __user *data, | |
03d254ed | 489 | size_t left, loff_t pos, loff_t *ppos) |
124e68e7 | 490 | { |
496ad9aa | 491 | struct inode *inode = file_inode(file); |
124e68e7 | 492 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 493 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
acead002 AE |
494 | struct ceph_snap_context *snapc; |
495 | struct ceph_vino vino; | |
124e68e7 | 496 | struct ceph_osd_request *req; |
acead002 | 497 | int num_ops = 1; |
124e68e7 SW |
498 | struct page **pages; |
499 | int num_pages; | |
124e68e7 SW |
500 | u64 len; |
501 | int written = 0; | |
502 | int flags; | |
124e68e7 | 503 | int check_caps = 0; |
b7495fc2 | 504 | int page_align, io_align; |
ab226e21 | 505 | unsigned long buf_align; |
124e68e7 SW |
506 | int ret; |
507 | struct timespec mtime = CURRENT_TIME; | |
43bfe5de | 508 | bool own_pages = false; |
124e68e7 | 509 | |
496ad9aa | 510 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
124e68e7 SW |
511 | return -EROFS; |
512 | ||
03d254ed | 513 | dout("sync_write on file %p %lld~%u %s\n", file, pos, |
124e68e7 SW |
514 | (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
515 | ||
29065a51 YS |
516 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left); |
517 | if (ret < 0) | |
518 | return ret; | |
519 | ||
520 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
521 | pos >> PAGE_CACHE_SHIFT, | |
522 | (pos + left) >> PAGE_CACHE_SHIFT); | |
523 | if (ret < 0) | |
524 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
525 | ||
124e68e7 SW |
526 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
527 | CEPH_OSD_FLAG_ONDISK | | |
528 | CEPH_OSD_FLAG_WRITE; | |
529 | if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0) | |
530 | flags |= CEPH_OSD_FLAG_ACK; | |
531 | else | |
acead002 | 532 | num_ops++; /* Also include a 'startsync' command. */ |
124e68e7 SW |
533 | |
534 | /* | |
535 | * we may need to do multiple writes here if we span an object | |
536 | * boundary. this isn't atomic, unfortunately. :( | |
537 | */ | |
538 | more: | |
d7f124f1 SW |
539 | io_align = pos & ~PAGE_MASK; |
540 | buf_align = (unsigned long)data & ~PAGE_MASK; | |
124e68e7 | 541 | len = left; |
3a42b6c4 | 542 | |
acead002 AE |
543 | snapc = ci->i_snap_realm->cached_context; |
544 | vino = ceph_vino(inode); | |
3d14c5d2 | 545 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
79528734 | 546 | vino, pos, &len, num_ops, |
acead002 | 547 | CEPH_OSD_OP_WRITE, flags, snapc, |
124e68e7 | 548 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 549 | false); |
6816282d SW |
550 | if (IS_ERR(req)) |
551 | return PTR_ERR(req); | |
124e68e7 | 552 | |
153e5167 AE |
553 | /* write from beginning of first page, regardless of io alignment */ |
554 | page_align = file->f_flags & O_DIRECT ? buf_align : io_align; | |
555 | num_pages = calc_pages_for(page_align, len); | |
124e68e7 | 556 | if (file->f_flags & O_DIRECT) { |
b6aa5901 | 557 | pages = ceph_get_direct_page_vector(data, num_pages, false); |
124e68e7 SW |
558 | if (IS_ERR(pages)) { |
559 | ret = PTR_ERR(pages); | |
560 | goto out; | |
561 | } | |
562 | ||
563 | /* | |
564 | * throw out any page cache pages in this range. this | |
565 | * may block. | |
566 | */ | |
213c99ee | 567 | truncate_inode_pages_range(inode->i_mapping, pos, |
5c6a2cdb | 568 | (pos+len) | (PAGE_CACHE_SIZE-1)); |
124e68e7 | 569 | } else { |
34d23762 | 570 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
124e68e7 SW |
571 | if (IS_ERR(pages)) { |
572 | ret = PTR_ERR(pages); | |
573 | goto out; | |
574 | } | |
3d14c5d2 | 575 | ret = ceph_copy_user_to_page_vector(pages, data, pos, len); |
124e68e7 SW |
576 | if (ret < 0) { |
577 | ceph_release_page_vector(pages, num_pages); | |
578 | goto out; | |
579 | } | |
580 | ||
581 | if ((file->f_flags & O_SYNC) == 0) { | |
582 | /* get a second commit callback */ | |
26be8808 AE |
583 | req->r_unsafe_callback = ceph_sync_write_unsafe; |
584 | req->r_inode = inode; | |
43bfe5de | 585 | own_pages = true; |
124e68e7 SW |
586 | } |
587 | } | |
a4ce40a9 | 588 | osd_req_op_extent_osd_data_pages(req, 0, true, pages, len, |
8c042b0d | 589 | page_align, false, own_pages); |
124e68e7 | 590 | |
02ee07d3 | 591 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ |
79528734 | 592 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); |
02ee07d3 | 593 | |
3d14c5d2 | 594 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
26be8808 | 595 | if (!ret) |
3d14c5d2 | 596 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); |
124e68e7 SW |
597 | |
598 | if (file->f_flags & O_DIRECT) | |
b6aa5901 | 599 | ceph_put_page_vector(pages, num_pages, false); |
124e68e7 SW |
600 | else if (file->f_flags & O_SYNC) |
601 | ceph_release_page_vector(pages, num_pages); | |
602 | ||
603 | out: | |
604 | ceph_osdc_put_request(req); | |
605 | if (ret == 0) { | |
606 | pos += len; | |
607 | written += len; | |
608 | left -= len; | |
022f3e2e | 609 | data += len; |
124e68e7 SW |
610 | if (left) |
611 | goto more; | |
612 | ||
613 | ret = written; | |
03d254ed | 614 | *ppos = pos; |
124e68e7 SW |
615 | if (pos > i_size_read(inode)) |
616 | check_caps = ceph_inode_set_size(inode, pos); | |
617 | if (check_caps) | |
618 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, | |
619 | NULL); | |
620 | } | |
621 | return ret; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
626 | * Atomically grab references, so that those bits are not released | |
627 | * back to the MDS mid-read. | |
628 | * | |
629 | * Hmm, the sync read case isn't actually async... should it be? | |
630 | */ | |
631 | static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
632 | unsigned long nr_segs, loff_t pos) | |
633 | { | |
634 | struct file *filp = iocb->ki_filp; | |
2962507c | 635 | struct ceph_file_info *fi = filp->private_data; |
124e68e7 SW |
636 | loff_t *ppos = &iocb->ki_pos; |
637 | size_t len = iov->iov_len; | |
496ad9aa | 638 | struct inode *inode = file_inode(filp); |
124e68e7 | 639 | struct ceph_inode_info *ci = ceph_inode(inode); |
cd84db6e | 640 | void __user *base = iov->iov_base; |
124e68e7 | 641 | ssize_t ret; |
2962507c | 642 | int want, got = 0; |
6a026589 | 643 | int checkeof = 0, read = 0; |
124e68e7 SW |
644 | |
645 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", | |
646 | inode, ceph_vinop(inode), pos, (unsigned)len, inode); | |
6a026589 | 647 | again: |
2962507c SW |
648 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
649 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
650 | else | |
651 | want = CEPH_CAP_FILE_CACHE; | |
652 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); | |
124e68e7 SW |
653 | if (ret < 0) |
654 | goto out; | |
655 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
656 | inode, ceph_vinop(inode), pos, (unsigned)len, | |
657 | ceph_cap_string(got)); | |
658 | ||
2962507c | 659 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
124e68e7 | 660 | (iocb->ki_filp->f_flags & O_DIRECT) || |
4918b6d1 SW |
661 | (inode->i_sb->s_flags & MS_SYNCHRONOUS) || |
662 | (fi->flags & CEPH_F_SYNC)) | |
124e68e7 | 663 | /* hmm, this isn't really async... */ |
6a026589 | 664 | ret = ceph_sync_read(filp, base, len, ppos, &checkeof); |
124e68e7 SW |
665 | else |
666 | ret = generic_file_aio_read(iocb, iov, nr_segs, pos); | |
667 | ||
668 | out: | |
669 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", | |
670 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
671 | ceph_put_cap_refs(ci, got); | |
6a026589 SW |
672 | |
673 | if (checkeof && ret >= 0) { | |
674 | int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); | |
675 | ||
676 | /* hit EOF or hole? */ | |
677 | if (statret == 0 && *ppos < inode->i_size) { | |
c3cd6283 | 678 | dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size); |
6a026589 SW |
679 | read += ret; |
680 | base += ret; | |
681 | len -= ret; | |
682 | checkeof = 0; | |
683 | goto again; | |
684 | } | |
685 | } | |
686 | if (ret >= 0) | |
687 | ret += read; | |
688 | ||
124e68e7 SW |
689 | return ret; |
690 | } | |
691 | ||
692 | /* | |
693 | * Take cap references to avoid releasing caps to MDS mid-write. | |
694 | * | |
695 | * If we are synchronous, and write with an old snap context, the OSD | |
696 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
697 | * dropping our cap refs and allowing the pending snap to logically | |
698 | * complete _before_ this write occurs. | |
699 | * | |
700 | * If we are near ENOSPC, write synchronously. | |
701 | */ | |
702 | static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
703 | unsigned long nr_segs, loff_t pos) | |
704 | { | |
705 | struct file *file = iocb->ki_filp; | |
33caad32 | 706 | struct ceph_file_info *fi = file->private_data; |
496ad9aa | 707 | struct inode *inode = file_inode(file); |
124e68e7 | 708 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
709 | struct ceph_osd_client *osdc = |
710 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
03d254ed YZ |
711 | ssize_t count, written = 0; |
712 | int err, want, got; | |
713 | bool hold_mutex; | |
124e68e7 SW |
714 | |
715 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
716 | return -EROFS; | |
717 | ||
6070e0c1 | 718 | sb_start_write(inode->i_sb); |
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 YZ |
749 | |
750 | dout("aio_write %p %llx.%llx %llu~%ld getting caps. i_size %llu\n", | |
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 | |
03d254ed YZ |
761 | dout("aio_write %p %llx.%llx %llu~%ld got cap refs on %s\n", |
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); | |
6070e0c1 | 811 | sb_end_write(inode->i_sb); |
03d254ed | 812 | current->backing_dev_info = NULL; |
124e68e7 | 813 | |
03d254ed | 814 | return written ? written : err; |
124e68e7 SW |
815 | } |
816 | ||
817 | /* | |
818 | * llseek. be sure to verify file size on SEEK_END. | |
819 | */ | |
965c8e59 | 820 | static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) |
124e68e7 SW |
821 | { |
822 | struct inode *inode = file->f_mapping->host; | |
823 | int ret; | |
824 | ||
825 | mutex_lock(&inode->i_mutex); | |
3f99969f | 826 | __ceph_do_pending_vmtruncate(inode, false); |
6a82c47a | 827 | |
965c8e59 | 828 | if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { |
124e68e7 SW |
829 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); |
830 | if (ret < 0) { | |
831 | offset = ret; | |
832 | goto out; | |
833 | } | |
06222e49 JB |
834 | } |
835 | ||
965c8e59 | 836 | switch (whence) { |
06222e49 | 837 | case SEEK_END: |
124e68e7 SW |
838 | offset += inode->i_size; |
839 | break; | |
840 | case SEEK_CUR: | |
841 | /* | |
842 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
843 | * position-querying operation. Avoid rewriting the "same" | |
844 | * f_pos value back to the file because a concurrent read(), | |
845 | * write() or lseek() might have altered it | |
846 | */ | |
847 | if (offset == 0) { | |
848 | offset = file->f_pos; | |
849 | goto out; | |
850 | } | |
851 | offset += file->f_pos; | |
852 | break; | |
06222e49 JB |
853 | case SEEK_DATA: |
854 | if (offset >= inode->i_size) { | |
855 | ret = -ENXIO; | |
856 | goto out; | |
857 | } | |
858 | break; | |
859 | case SEEK_HOLE: | |
860 | if (offset >= inode->i_size) { | |
861 | ret = -ENXIO; | |
862 | goto out; | |
863 | } | |
864 | offset = inode->i_size; | |
865 | break; | |
124e68e7 SW |
866 | } |
867 | ||
868 | if (offset < 0 || offset > inode->i_sb->s_maxbytes) { | |
869 | offset = -EINVAL; | |
870 | goto out; | |
871 | } | |
872 | ||
873 | /* Special lock needed here? */ | |
874 | if (offset != file->f_pos) { | |
875 | file->f_pos = offset; | |
876 | file->f_version = 0; | |
877 | } | |
878 | ||
879 | out: | |
880 | mutex_unlock(&inode->i_mutex); | |
881 | return offset; | |
882 | } | |
883 | ||
884 | const struct file_operations ceph_file_fops = { | |
885 | .open = ceph_open, | |
886 | .release = ceph_release, | |
887 | .llseek = ceph_llseek, | |
888 | .read = do_sync_read, | |
889 | .write = do_sync_write, | |
890 | .aio_read = ceph_aio_read, | |
891 | .aio_write = ceph_aio_write, | |
892 | .mmap = ceph_mmap, | |
893 | .fsync = ceph_fsync, | |
40819f6f GF |
894 | .lock = ceph_lock, |
895 | .flock = ceph_flock, | |
124e68e7 SW |
896 | .splice_read = generic_file_splice_read, |
897 | .splice_write = generic_file_splice_write, | |
898 | .unlocked_ioctl = ceph_ioctl, | |
899 | .compat_ioctl = ceph_ioctl, | |
900 | }; | |
901 |