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> |
ad7a60de | 11 | #include <linux/falloc.h> |
124e68e7 SW |
12 | |
13 | #include "super.h" | |
14 | #include "mds_client.h" | |
99ccbd22 | 15 | #include "cache.h" |
124e68e7 SW |
16 | |
17 | /* | |
18 | * Ceph file operations | |
19 | * | |
20 | * Implement basic open/close functionality, and implement | |
21 | * read/write. | |
22 | * | |
23 | * We implement three modes of file I/O: | |
24 | * - buffered uses the generic_file_aio_{read,write} helpers | |
25 | * | |
26 | * - synchronous is used when there is multi-client read/write | |
27 | * sharing, avoids the page cache, and synchronously waits for an | |
28 | * ack from the OSD. | |
29 | * | |
30 | * - direct io takes the variant of the sync path that references | |
31 | * user pages directly. | |
32 | * | |
33 | * fsync() flushes and waits on dirty pages, but just queues metadata | |
34 | * for writeback: since the MDS can recover size and mtime there is no | |
35 | * need to wait for MDS acknowledgement. | |
36 | */ | |
37 | ||
38 | ||
39 | /* | |
40 | * Prepare an open request. Preallocate ceph_cap to avoid an | |
41 | * inopportune ENOMEM later. | |
42 | */ | |
43 | static struct ceph_mds_request * | |
44 | prepare_open_request(struct super_block *sb, int flags, int create_mode) | |
45 | { | |
3d14c5d2 YS |
46 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
47 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
48 | struct ceph_mds_request *req; |
49 | int want_auth = USE_ANY_MDS; | |
50 | int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; | |
51 | ||
52 | if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) | |
53 | want_auth = USE_AUTH_MDS; | |
54 | ||
55 | req = ceph_mdsc_create_request(mdsc, op, want_auth); | |
56 | if (IS_ERR(req)) | |
57 | goto out; | |
58 | req->r_fmode = ceph_flags_to_mode(flags); | |
59 | req->r_args.open.flags = cpu_to_le32(flags); | |
60 | req->r_args.open.mode = cpu_to_le32(create_mode); | |
124e68e7 SW |
61 | out: |
62 | return req; | |
63 | } | |
64 | ||
65 | /* | |
66 | * initialize private struct file data. | |
67 | * if we fail, clean up by dropping fmode reference on the ceph_inode | |
68 | */ | |
69 | static int ceph_init_file(struct inode *inode, struct file *file, int fmode) | |
70 | { | |
71 | struct ceph_file_info *cf; | |
72 | int ret = 0; | |
99ccbd22 MT |
73 | struct ceph_inode_info *ci = ceph_inode(inode); |
74 | struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); | |
75 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
76 | |
77 | switch (inode->i_mode & S_IFMT) { | |
78 | case S_IFREG: | |
99ccbd22 MT |
79 | /* First file open request creates the cookie, we want to keep |
80 | * this cookie around for the filetime of the inode as not to | |
81 | * have to worry about fscache register / revoke / operation | |
82 | * races. | |
83 | * | |
84 | * Also, if we know the operation is going to invalidate data | |
85 | * (non readonly) just nuke the cache right away. | |
86 | */ | |
87 | ceph_fscache_register_inode_cookie(mdsc->fsc, ci); | |
88 | if ((fmode & CEPH_FILE_MODE_WR)) | |
89 | ceph_fscache_invalidate(inode); | |
124e68e7 SW |
90 | case S_IFDIR: |
91 | dout("init_file %p %p 0%o (regular)\n", inode, file, | |
92 | inode->i_mode); | |
93 | cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO); | |
94 | if (cf == NULL) { | |
95 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
96 | return -ENOMEM; | |
97 | } | |
98 | cf->fmode = fmode; | |
99 | cf->next_offset = 2; | |
100 | file->private_data = cf; | |
101 | BUG_ON(inode->i_fop->release != ceph_release); | |
102 | break; | |
103 | ||
104 | case S_IFLNK: | |
105 | dout("init_file %p %p 0%o (symlink)\n", inode, file, | |
106 | inode->i_mode); | |
107 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
108 | break; | |
109 | ||
110 | default: | |
111 | dout("init_file %p %p 0%o (special)\n", inode, file, | |
112 | inode->i_mode); | |
113 | /* | |
114 | * we need to drop the open ref now, since we don't | |
115 | * have .release set to ceph_release. | |
116 | */ | |
117 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
118 | BUG_ON(inode->i_fop->release == ceph_release); | |
119 | ||
120 | /* call the proper open fop */ | |
121 | ret = inode->i_fop->open(inode, file); | |
122 | } | |
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
124e68e7 SW |
127 | * If we already have the requisite capabilities, we can satisfy |
128 | * the open request locally (no need to request new caps from the | |
129 | * MDS). We do, however, need to inform the MDS (asynchronously) | |
130 | * if our wanted caps set expands. | |
131 | */ | |
132 | int ceph_open(struct inode *inode, struct file *file) | |
133 | { | |
134 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 YS |
135 | struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); |
136 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
137 | struct ceph_mds_request *req; |
138 | struct ceph_file_info *cf = file->private_data; | |
5f21c96d | 139 | struct inode *parent_inode = NULL; |
124e68e7 SW |
140 | int err; |
141 | int flags, fmode, wanted; | |
142 | ||
143 | if (cf) { | |
144 | dout("open file %p is already opened\n", file); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ | |
149 | flags = file->f_flags & ~(O_CREAT|O_EXCL); | |
150 | if (S_ISDIR(inode->i_mode)) | |
151 | flags = O_DIRECTORY; /* mds likes to know */ | |
152 | ||
153 | dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, | |
154 | ceph_vinop(inode), file, flags, file->f_flags); | |
155 | fmode = ceph_flags_to_mode(flags); | |
156 | wanted = ceph_caps_for_mode(fmode); | |
157 | ||
158 | /* snapped files are read-only */ | |
159 | if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) | |
160 | return -EROFS; | |
161 | ||
162 | /* trivially open snapdir */ | |
163 | if (ceph_snap(inode) == CEPH_SNAPDIR) { | |
be655596 | 164 | spin_lock(&ci->i_ceph_lock); |
124e68e7 | 165 | __ceph_get_fmode(ci, fmode); |
be655596 | 166 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
167 | return ceph_init_file(inode, file, fmode); |
168 | } | |
169 | ||
170 | /* | |
7421ab80 SW |
171 | * No need to block if we have caps on the auth MDS (for |
172 | * write) or any MDS (for read). Update wanted set | |
124e68e7 SW |
173 | * asynchronously. |
174 | */ | |
be655596 | 175 | spin_lock(&ci->i_ceph_lock); |
7421ab80 SW |
176 | if (__ceph_is_any_real_caps(ci) && |
177 | (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { | |
124e68e7 SW |
178 | int mds_wanted = __ceph_caps_mds_wanted(ci); |
179 | int issued = __ceph_caps_issued(ci, NULL); | |
180 | ||
181 | dout("open %p fmode %d want %s issued %s using existing\n", | |
182 | inode, fmode, ceph_cap_string(wanted), | |
183 | ceph_cap_string(issued)); | |
184 | __ceph_get_fmode(ci, fmode); | |
be655596 | 185 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
186 | |
187 | /* adjust wanted? */ | |
188 | if ((issued & wanted) != wanted && | |
189 | (mds_wanted & wanted) != wanted && | |
190 | ceph_snap(inode) != CEPH_SNAPDIR) | |
191 | ceph_check_caps(ci, 0, NULL); | |
192 | ||
193 | return ceph_init_file(inode, file, fmode); | |
194 | } else if (ceph_snap(inode) != CEPH_NOSNAP && | |
195 | (ci->i_snap_caps & wanted) == wanted) { | |
196 | __ceph_get_fmode(ci, fmode); | |
be655596 | 197 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
198 | return ceph_init_file(inode, file, fmode); |
199 | } | |
99ccbd22 | 200 | |
be655596 | 201 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
202 | |
203 | dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); | |
204 | req = prepare_open_request(inode->i_sb, flags, 0); | |
205 | if (IS_ERR(req)) { | |
206 | err = PTR_ERR(req); | |
207 | goto out; | |
208 | } | |
70b666c3 SW |
209 | req->r_inode = inode; |
210 | ihold(inode); | |
99ccbd22 | 211 | |
124e68e7 | 212 | req->r_num_caps = 1; |
5f21c96d SW |
213 | if (flags & (O_CREAT|O_TRUNC)) |
214 | parent_inode = ceph_get_dentry_parent_inode(file->f_dentry); | |
124e68e7 | 215 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); |
5f21c96d | 216 | iput(parent_inode); |
124e68e7 SW |
217 | if (!err) |
218 | err = ceph_init_file(inode, file, req->r_fmode); | |
219 | ceph_mdsc_put_request(req); | |
220 | dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); | |
221 | out: | |
222 | return err; | |
223 | } | |
224 | ||
225 | ||
226 | /* | |
5ef50c3b SW |
227 | * Do a lookup + open with a single request. If we get a non-existent |
228 | * file or symlink, return 1 so the VFS can retry. | |
124e68e7 | 229 | */ |
5ef50c3b | 230 | int ceph_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 231 | struct file *file, unsigned flags, umode_t mode, |
d9585277 | 232 | int *opened) |
124e68e7 | 233 | { |
3d14c5d2 YS |
234 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
235 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 | 236 | struct ceph_mds_request *req; |
5ef50c3b | 237 | struct dentry *dn; |
124e68e7 | 238 | int err; |
124e68e7 | 239 | |
5ef50c3b SW |
240 | dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n", |
241 | dir, dentry, dentry->d_name.len, dentry->d_name.name, | |
242 | d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); | |
243 | ||
244 | if (dentry->d_name.len > NAME_MAX) | |
245 | return -ENAMETOOLONG; | |
246 | ||
247 | err = ceph_init_dentry(dentry); | |
248 | if (err < 0) | |
249 | return err; | |
124e68e7 SW |
250 | |
251 | /* do the open */ | |
252 | req = prepare_open_request(dir->i_sb, flags, mode); | |
253 | if (IS_ERR(req)) | |
d9585277 | 254 | return PTR_ERR(req); |
124e68e7 SW |
255 | req->r_dentry = dget(dentry); |
256 | req->r_num_caps = 2; | |
257 | if (flags & O_CREAT) { | |
258 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
259 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
260 | } | |
261 | req->r_locked_dir = dir; /* caller holds dir->i_mutex */ | |
acda7657 SW |
262 | err = ceph_mdsc_do_request(mdsc, |
263 | (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, | |
264 | req); | |
79aec984 SL |
265 | if (err) |
266 | goto out_err; | |
267 | ||
468640e3 | 268 | err = ceph_handle_snapdir(req, dentry, err); |
5ef50c3b | 269 | if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) |
124e68e7 | 270 | err = ceph_handle_notrace_create(dir, dentry); |
2d83bde9 | 271 | |
5ef50c3b SW |
272 | if (d_unhashed(dentry)) { |
273 | dn = ceph_finish_lookup(req, dentry, err); | |
274 | if (IS_ERR(dn)) | |
275 | err = PTR_ERR(dn); | |
276 | } else { | |
277 | /* we were given a hashed negative dentry */ | |
278 | dn = NULL; | |
279 | } | |
280 | if (err) | |
281 | goto out_err; | |
282 | if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) { | |
283 | /* make vfs retry on splice, ENOENT, or symlink */ | |
284 | dout("atomic_open finish_no_open on dn %p\n", dn); | |
285 | err = finish_no_open(file, dn); | |
286 | } else { | |
287 | dout("atomic_open finish_open on dn %p\n", dn); | |
6e8575fa SL |
288 | if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { |
289 | *opened |= FILE_CREATED; | |
290 | } | |
5ef50c3b SW |
291 | err = finish_open(file, dentry, ceph_open, opened); |
292 | } | |
2d83bde9 | 293 | |
5ef50c3b SW |
294 | out_err: |
295 | ceph_mdsc_put_request(req); | |
296 | dout("atomic_open result=%d\n", err); | |
d9585277 | 297 | return err; |
124e68e7 SW |
298 | } |
299 | ||
300 | int ceph_release(struct inode *inode, struct file *file) | |
301 | { | |
302 | struct ceph_inode_info *ci = ceph_inode(inode); | |
303 | struct ceph_file_info *cf = file->private_data; | |
304 | ||
305 | dout("release inode %p file %p\n", inode, file); | |
306 | ceph_put_fmode(ci, cf->fmode); | |
307 | if (cf->last_readdir) | |
308 | ceph_mdsc_put_request(cf->last_readdir); | |
309 | kfree(cf->last_name); | |
310 | kfree(cf->dir_info); | |
311 | dput(cf->dentry); | |
312 | kmem_cache_free(ceph_file_cachep, cf); | |
195d3ce2 SW |
313 | |
314 | /* wake up anyone waiting for caps on this inode */ | |
03066f23 | 315 | wake_up_all(&ci->i_cap_wq); |
124e68e7 SW |
316 | return 0; |
317 | } | |
318 | ||
124e68e7 SW |
319 | /* |
320 | * Read a range of bytes striped over one or more objects. Iterate over | |
321 | * objects we stripe over. (That's not atomic, but good enough for now.) | |
322 | * | |
323 | * If we get a short result from the OSD, check against i_size; we need to | |
324 | * only return a short read to the caller if we hit EOF. | |
325 | */ | |
326 | static int striped_read(struct inode *inode, | |
327 | u64 off, u64 len, | |
6a026589 | 328 | struct page **pages, int num_pages, |
c3cd6283 | 329 | int *checkeof, bool o_direct, |
ab226e21 | 330 | unsigned long buf_align) |
124e68e7 | 331 | { |
3d14c5d2 | 332 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 | 333 | struct ceph_inode_info *ci = ceph_inode(inode); |
688bac46 | 334 | u64 pos, this_len, left; |
b7495fc2 | 335 | int io_align, page_align; |
688bac46 | 336 | int pages_left; |
124e68e7 SW |
337 | int read; |
338 | struct page **page_pos; | |
339 | int ret; | |
340 | bool hit_stripe, was_short; | |
341 | ||
342 | /* | |
343 | * we may need to do multiple reads. not atomic, unfortunately. | |
344 | */ | |
345 | pos = off; | |
346 | left = len; | |
347 | page_pos = pages; | |
348 | pages_left = num_pages; | |
349 | read = 0; | |
b7495fc2 | 350 | io_align = off & ~PAGE_MASK; |
124e68e7 SW |
351 | |
352 | more: | |
c3cd6283 | 353 | if (o_direct) |
ab226e21 | 354 | page_align = (pos - io_align + buf_align) & ~PAGE_MASK; |
b7495fc2 SW |
355 | else |
356 | page_align = pos & ~PAGE_MASK; | |
124e68e7 | 357 | this_len = left; |
3d14c5d2 | 358 | ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
124e68e7 SW |
359 | &ci->i_layout, pos, &this_len, |
360 | ci->i_truncate_seq, | |
361 | ci->i_truncate_size, | |
b7495fc2 | 362 | page_pos, pages_left, page_align); |
124e68e7 SW |
363 | if (ret == -ENOENT) |
364 | ret = 0; | |
0e98728f SW |
365 | hit_stripe = this_len < left; |
366 | was_short = ret >= 0 && ret < this_len; | |
688bac46 | 367 | dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, |
124e68e7 SW |
368 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); |
369 | ||
02ae66d8 | 370 | if (ret >= 0) { |
371 | int didpages; | |
372 | if (was_short && (pos + ret < inode->i_size)) { | |
373 | u64 tmp = min(this_len - ret, | |
374 | inode->i_size - pos - ret); | |
375 | dout(" zero gap %llu to %llu\n", | |
376 | pos + ret, pos + ret + tmp); | |
377 | ceph_zero_page_vector_range(page_align + read + ret, | |
378 | tmp, pages); | |
379 | ret += tmp; | |
124e68e7 | 380 | } |
02ae66d8 | 381 | |
382 | didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; | |
124e68e7 SW |
383 | pos += ret; |
384 | read = pos - off; | |
385 | left -= ret; | |
386 | page_pos += didpages; | |
387 | pages_left -= didpages; | |
388 | ||
02ae66d8 | 389 | /* hit stripe and need continue*/ |
390 | if (left && hit_stripe && pos < inode->i_size) | |
124e68e7 SW |
391 | goto more; |
392 | } | |
393 | ||
ee7289bf | 394 | if (read > 0) { |
02ae66d8 | 395 | ret = read; |
c3cd6283 SW |
396 | /* did we bounce off eof? */ |
397 | if (pos + left > inode->i_size) | |
398 | *checkeof = 1; | |
124e68e7 SW |
399 | } |
400 | ||
124e68e7 SW |
401 | dout("striped_read returns %d\n", ret); |
402 | return ret; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Completely synchronous read and write methods. Direct from __user | |
407 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
408 | * | |
409 | * If the read spans object boundary, just do multiple reads. | |
410 | */ | |
411 | static ssize_t ceph_sync_read(struct file *file, char __user *data, | |
6a026589 | 412 | unsigned len, loff_t *poff, int *checkeof) |
124e68e7 | 413 | { |
496ad9aa | 414 | struct inode *inode = file_inode(file); |
124e68e7 SW |
415 | struct page **pages; |
416 | u64 off = *poff; | |
ab226e21 | 417 | int num_pages, ret; |
124e68e7 SW |
418 | |
419 | dout("sync_read on file %p %llu~%u %s\n", file, off, len, | |
420 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); | |
421 | ||
ab226e21 HC |
422 | if (file->f_flags & O_DIRECT) { |
423 | num_pages = calc_pages_for((unsigned long)data, len); | |
b6aa5901 | 424 | pages = ceph_get_direct_page_vector(data, num_pages, true); |
ab226e21 HC |
425 | } else { |
426 | num_pages = calc_pages_for(off, len); | |
34d23762 | 427 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
ab226e21 | 428 | } |
124e68e7 SW |
429 | if (IS_ERR(pages)) |
430 | return PTR_ERR(pages); | |
431 | ||
e98b6fed SW |
432 | /* |
433 | * flush any page cache pages in this range. this | |
434 | * will make concurrent normal and sync io slow, | |
435 | * but it will at least behave sensibly when they are | |
436 | * in sequence. | |
437 | */ | |
29065a51 YS |
438 | ret = filemap_write_and_wait(inode->i_mapping); |
439 | if (ret < 0) | |
440 | goto done; | |
441 | ||
b7495fc2 | 442 | ret = striped_read(inode, off, len, pages, num_pages, checkeof, |
ab226e21 HC |
443 | file->f_flags & O_DIRECT, |
444 | (unsigned long)data & ~PAGE_MASK); | |
124e68e7 SW |
445 | |
446 | if (ret >= 0 && (file->f_flags & O_DIRECT) == 0) | |
3d14c5d2 | 447 | ret = ceph_copy_page_vector_to_user(pages, data, off, ret); |
124e68e7 SW |
448 | if (ret >= 0) |
449 | *poff = off + ret; | |
450 | ||
29065a51 | 451 | done: |
124e68e7 | 452 | if (file->f_flags & O_DIRECT) |
b6aa5901 | 453 | ceph_put_page_vector(pages, num_pages, true); |
124e68e7 SW |
454 | else |
455 | ceph_release_page_vector(pages, num_pages); | |
456 | dout("sync_read result %d\n", ret); | |
457 | return ret; | |
458 | } | |
459 | ||
460 | /* | |
26be8808 AE |
461 | * Write commit request unsafe callback, called to tell us when a |
462 | * request is unsafe (that is, in flight--has been handed to the | |
463 | * messenger to send to its target osd). It is called again when | |
464 | * we've received a response message indicating the request is | |
465 | * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request | |
466 | * is completed early (and unsuccessfully) due to a timeout or | |
467 | * interrupt. | |
468 | * | |
469 | * This is used if we requested both an ACK and ONDISK commit reply | |
470 | * from the OSD. | |
124e68e7 | 471 | */ |
26be8808 | 472 | static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) |
124e68e7 SW |
473 | { |
474 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
475 | ||
26be8808 AE |
476 | dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, |
477 | unsafe ? "un" : ""); | |
478 | if (unsafe) { | |
479 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
480 | spin_lock(&ci->i_unsafe_lock); | |
481 | list_add_tail(&req->r_unsafe_item, | |
482 | &ci->i_unsafe_writes); | |
483 | spin_unlock(&ci->i_unsafe_lock); | |
484 | } else { | |
485 | spin_lock(&ci->i_unsafe_lock); | |
486 | list_del_init(&req->r_unsafe_item); | |
487 | spin_unlock(&ci->i_unsafe_lock); | |
488 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
489 | } | |
124e68e7 SW |
490 | } |
491 | ||
492 | /* | |
493 | * Synchronous write, straight from __user pointer or user pages (if | |
494 | * O_DIRECT). | |
495 | * | |
496 | * If write spans object boundary, just do multiple writes. (For a | |
497 | * correct atomic write, we should e.g. take write locks on all | |
498 | * objects, rollback on failure, etc.) | |
499 | */ | |
500 | static ssize_t ceph_sync_write(struct file *file, const char __user *data, | |
03d254ed | 501 | size_t left, loff_t pos, loff_t *ppos) |
124e68e7 | 502 | { |
496ad9aa | 503 | struct inode *inode = file_inode(file); |
124e68e7 | 504 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 505 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
acead002 AE |
506 | struct ceph_snap_context *snapc; |
507 | struct ceph_vino vino; | |
124e68e7 | 508 | struct ceph_osd_request *req; |
acead002 | 509 | int num_ops = 1; |
124e68e7 SW |
510 | struct page **pages; |
511 | int num_pages; | |
124e68e7 SW |
512 | u64 len; |
513 | int written = 0; | |
514 | int flags; | |
124e68e7 | 515 | int check_caps = 0; |
b7495fc2 | 516 | int page_align, io_align; |
ab226e21 | 517 | unsigned long buf_align; |
124e68e7 SW |
518 | int ret; |
519 | struct timespec mtime = CURRENT_TIME; | |
43bfe5de | 520 | bool own_pages = false; |
124e68e7 | 521 | |
496ad9aa | 522 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
124e68e7 SW |
523 | return -EROFS; |
524 | ||
03d254ed | 525 | dout("sync_write on file %p %lld~%u %s\n", file, pos, |
124e68e7 SW |
526 | (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
527 | ||
29065a51 YS |
528 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left); |
529 | if (ret < 0) | |
530 | return ret; | |
531 | ||
532 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
533 | pos >> PAGE_CACHE_SHIFT, | |
534 | (pos + left) >> PAGE_CACHE_SHIFT); | |
535 | if (ret < 0) | |
536 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
537 | ||
124e68e7 SW |
538 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
539 | CEPH_OSD_FLAG_ONDISK | | |
540 | CEPH_OSD_FLAG_WRITE; | |
541 | if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0) | |
542 | flags |= CEPH_OSD_FLAG_ACK; | |
543 | else | |
acead002 | 544 | num_ops++; /* Also include a 'startsync' command. */ |
124e68e7 SW |
545 | |
546 | /* | |
547 | * we may need to do multiple writes here if we span an object | |
548 | * boundary. this isn't atomic, unfortunately. :( | |
549 | */ | |
550 | more: | |
d7f124f1 SW |
551 | io_align = pos & ~PAGE_MASK; |
552 | buf_align = (unsigned long)data & ~PAGE_MASK; | |
124e68e7 | 553 | len = left; |
3a42b6c4 | 554 | |
acead002 AE |
555 | snapc = ci->i_snap_realm->cached_context; |
556 | vino = ceph_vino(inode); | |
3d14c5d2 | 557 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
79528734 | 558 | vino, pos, &len, num_ops, |
acead002 | 559 | CEPH_OSD_OP_WRITE, flags, snapc, |
124e68e7 | 560 | ci->i_truncate_seq, ci->i_truncate_size, |
acead002 | 561 | false); |
6816282d SW |
562 | if (IS_ERR(req)) |
563 | return PTR_ERR(req); | |
124e68e7 | 564 | |
153e5167 AE |
565 | /* write from beginning of first page, regardless of io alignment */ |
566 | page_align = file->f_flags & O_DIRECT ? buf_align : io_align; | |
567 | num_pages = calc_pages_for(page_align, len); | |
124e68e7 | 568 | if (file->f_flags & O_DIRECT) { |
b6aa5901 | 569 | pages = ceph_get_direct_page_vector(data, num_pages, false); |
124e68e7 SW |
570 | if (IS_ERR(pages)) { |
571 | ret = PTR_ERR(pages); | |
572 | goto out; | |
573 | } | |
574 | ||
575 | /* | |
576 | * throw out any page cache pages in this range. this | |
577 | * may block. | |
578 | */ | |
213c99ee | 579 | truncate_inode_pages_range(inode->i_mapping, pos, |
5c6a2cdb | 580 | (pos+len) | (PAGE_CACHE_SIZE-1)); |
124e68e7 | 581 | } else { |
34d23762 | 582 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
124e68e7 SW |
583 | if (IS_ERR(pages)) { |
584 | ret = PTR_ERR(pages); | |
585 | goto out; | |
586 | } | |
3d14c5d2 | 587 | ret = ceph_copy_user_to_page_vector(pages, data, pos, len); |
124e68e7 SW |
588 | if (ret < 0) { |
589 | ceph_release_page_vector(pages, num_pages); | |
590 | goto out; | |
591 | } | |
592 | ||
593 | if ((file->f_flags & O_SYNC) == 0) { | |
594 | /* get a second commit callback */ | |
26be8808 AE |
595 | req->r_unsafe_callback = ceph_sync_write_unsafe; |
596 | req->r_inode = inode; | |
43bfe5de | 597 | own_pages = true; |
124e68e7 SW |
598 | } |
599 | } | |
406e2c9f AE |
600 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align, |
601 | false, own_pages); | |
124e68e7 | 602 | |
02ee07d3 | 603 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ |
79528734 | 604 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); |
02ee07d3 | 605 | |
3d14c5d2 | 606 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
26be8808 | 607 | if (!ret) |
3d14c5d2 | 608 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); |
124e68e7 SW |
609 | |
610 | if (file->f_flags & O_DIRECT) | |
b6aa5901 | 611 | ceph_put_page_vector(pages, num_pages, false); |
124e68e7 SW |
612 | else if (file->f_flags & O_SYNC) |
613 | ceph_release_page_vector(pages, num_pages); | |
614 | ||
615 | out: | |
616 | ceph_osdc_put_request(req); | |
617 | if (ret == 0) { | |
618 | pos += len; | |
619 | written += len; | |
620 | left -= len; | |
022f3e2e | 621 | data += len; |
124e68e7 SW |
622 | if (left) |
623 | goto more; | |
624 | ||
625 | ret = written; | |
03d254ed | 626 | *ppos = pos; |
124e68e7 SW |
627 | if (pos > i_size_read(inode)) |
628 | check_caps = ceph_inode_set_size(inode, pos); | |
629 | if (check_caps) | |
630 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, | |
631 | NULL); | |
ee7289bf | 632 | } else if (ret != -EOLDSNAPC && written > 0) { |
633 | ret = written; | |
124e68e7 SW |
634 | } |
635 | return ret; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
640 | * Atomically grab references, so that those bits are not released | |
641 | * back to the MDS mid-read. | |
642 | * | |
643 | * Hmm, the sync read case isn't actually async... should it be? | |
644 | */ | |
645 | static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
646 | unsigned long nr_segs, loff_t pos) | |
647 | { | |
648 | struct file *filp = iocb->ki_filp; | |
2962507c | 649 | struct ceph_file_info *fi = filp->private_data; |
124e68e7 SW |
650 | loff_t *ppos = &iocb->ki_pos; |
651 | size_t len = iov->iov_len; | |
496ad9aa | 652 | struct inode *inode = file_inode(filp); |
124e68e7 | 653 | struct ceph_inode_info *ci = ceph_inode(inode); |
cd84db6e | 654 | void __user *base = iov->iov_base; |
124e68e7 | 655 | ssize_t ret; |
2962507c | 656 | int want, got = 0; |
6a026589 | 657 | int checkeof = 0, read = 0; |
124e68e7 SW |
658 | |
659 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", | |
660 | inode, ceph_vinop(inode), pos, (unsigned)len, inode); | |
6a026589 | 661 | again: |
2962507c SW |
662 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
663 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
664 | else | |
665 | want = CEPH_CAP_FILE_CACHE; | |
666 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); | |
124e68e7 SW |
667 | if (ret < 0) |
668 | goto out; | |
669 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
670 | inode, ceph_vinop(inode), pos, (unsigned)len, | |
671 | ceph_cap_string(got)); | |
672 | ||
2962507c | 673 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
124e68e7 | 674 | (iocb->ki_filp->f_flags & O_DIRECT) || |
4918b6d1 | 675 | (fi->flags & CEPH_F_SYNC)) |
124e68e7 | 676 | /* hmm, this isn't really async... */ |
6a026589 | 677 | ret = ceph_sync_read(filp, base, len, ppos, &checkeof); |
124e68e7 SW |
678 | else |
679 | ret = generic_file_aio_read(iocb, iov, nr_segs, pos); | |
680 | ||
681 | out: | |
682 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", | |
683 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
684 | ceph_put_cap_refs(ci, got); | |
6a026589 SW |
685 | |
686 | if (checkeof && ret >= 0) { | |
687 | int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); | |
688 | ||
689 | /* hit EOF or hole? */ | |
690 | if (statret == 0 && *ppos < inode->i_size) { | |
c3cd6283 | 691 | dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size); |
6a026589 SW |
692 | read += ret; |
693 | base += ret; | |
694 | len -= ret; | |
695 | checkeof = 0; | |
696 | goto again; | |
697 | } | |
698 | } | |
699 | if (ret >= 0) | |
700 | ret += read; | |
701 | ||
124e68e7 SW |
702 | return ret; |
703 | } | |
704 | ||
705 | /* | |
706 | * Take cap references to avoid releasing caps to MDS mid-write. | |
707 | * | |
708 | * If we are synchronous, and write with an old snap context, the OSD | |
709 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
710 | * dropping our cap refs and allowing the pending snap to logically | |
711 | * complete _before_ this write occurs. | |
712 | * | |
713 | * If we are near ENOSPC, write synchronously. | |
714 | */ | |
715 | static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
716 | unsigned long nr_segs, loff_t pos) | |
717 | { | |
718 | struct file *file = iocb->ki_filp; | |
33caad32 | 719 | struct ceph_file_info *fi = file->private_data; |
496ad9aa | 720 | struct inode *inode = file_inode(file); |
124e68e7 | 721 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
722 | struct ceph_osd_client *osdc = |
723 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
03d254ed YZ |
724 | ssize_t count, written = 0; |
725 | int err, want, got; | |
124e68e7 SW |
726 | |
727 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
728 | return -EROFS; | |
729 | ||
03d254ed | 730 | mutex_lock(&inode->i_mutex); |
03d254ed YZ |
731 | |
732 | err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ); | |
733 | if (err) | |
734 | goto out; | |
735 | ||
736 | /* We can write back this queue in page reclaim */ | |
737 | current->backing_dev_info = file->f_mapping->backing_dev_info; | |
738 | ||
739 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
740 | if (err) | |
741 | goto out; | |
742 | ||
743 | if (count == 0) | |
744 | goto out; | |
745 | ||
746 | err = file_remove_suid(file); | |
747 | if (err) | |
748 | goto out; | |
749 | ||
750 | err = file_update_time(file); | |
751 | if (err) | |
752 | goto out; | |
753 | ||
124e68e7 | 754 | retry_snap: |
6070e0c1 | 755 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { |
03d254ed | 756 | err = -ENOSPC; |
6070e0c1 YZ |
757 | goto out; |
758 | } | |
03d254ed | 759 | |
ac7f29bf | 760 | dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", |
03d254ed | 761 | inode, ceph_vinop(inode), pos, count, inode->i_size); |
7971bd92 SW |
762 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
763 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
764 | else | |
765 | want = CEPH_CAP_FILE_BUFFER; | |
03d254ed YZ |
766 | got = 0; |
767 | err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count); | |
768 | if (err < 0) | |
37505d57 | 769 | goto out; |
124e68e7 | 770 | |
ac7f29bf | 771 | dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", |
03d254ed | 772 | inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); |
7971bd92 SW |
773 | |
774 | if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || | |
775 | (iocb->ki_filp->f_flags & O_DIRECT) || | |
7971bd92 | 776 | (fi->flags & CEPH_F_SYNC)) { |
37505d57 | 777 | mutex_unlock(&inode->i_mutex); |
03d254ed YZ |
778 | written = ceph_sync_write(file, iov->iov_base, count, |
779 | pos, &iocb->ki_pos); | |
0e5dd45c | 780 | if (written == -EOLDSNAPC) { |
781 | dout("aio_write %p %llx.%llx %llu~%u" | |
782 | "got EOLDSNAPC, retrying\n", | |
783 | inode, ceph_vinop(inode), | |
784 | pos, (unsigned)iov->iov_len); | |
785 | mutex_lock(&inode->i_mutex); | |
0e5dd45c | 786 | goto retry_snap; |
787 | } | |
7971bd92 | 788 | } else { |
b0d7c223 YZ |
789 | /* |
790 | * No need to acquire the i_truncate_mutex. Because | |
791 | * the MDS revokes Fwb caps before sending truncate | |
792 | * message to us. We can't get Fwb cap while there | |
793 | * are pending vmtruncate. So write and vmtruncate | |
794 | * can not run at the same time | |
795 | */ | |
03d254ed YZ |
796 | written = generic_file_buffered_write(iocb, iov, nr_segs, |
797 | pos, &iocb->ki_pos, | |
798 | count, 0); | |
6070e0c1 | 799 | mutex_unlock(&inode->i_mutex); |
7971bd92 | 800 | } |
d8de9ab6 | 801 | |
03d254ed | 802 | if (written >= 0) { |
fca65b4a | 803 | int dirty; |
be655596 | 804 | spin_lock(&ci->i_ceph_lock); |
fca65b4a | 805 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); |
be655596 | 806 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
807 | if (dirty) |
808 | __mark_inode_dirty(inode, dirty); | |
124e68e7 | 809 | } |
7971bd92 | 810 | |
124e68e7 | 811 | dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", |
7971bd92 SW |
812 | inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, |
813 | ceph_cap_string(got)); | |
124e68e7 | 814 | ceph_put_cap_refs(ci, got); |
7971bd92 | 815 | |
03d254ed | 816 | if (written >= 0 && |
6070e0c1 YZ |
817 | ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || |
818 | ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { | |
03d254ed | 819 | err = vfs_fsync_range(file, pos, pos + written - 1, 1); |
6070e0c1 | 820 | if (err < 0) |
03d254ed | 821 | written = err; |
6070e0c1 | 822 | } |
03d254ed | 823 | |
2f75e9e1 SW |
824 | goto out_unlocked; |
825 | ||
03d254ed | 826 | out: |
2f75e9e1 SW |
827 | mutex_unlock(&inode->i_mutex); |
828 | out_unlocked: | |
03d254ed | 829 | current->backing_dev_info = NULL; |
03d254ed | 830 | return written ? written : err; |
124e68e7 SW |
831 | } |
832 | ||
833 | /* | |
834 | * llseek. be sure to verify file size on SEEK_END. | |
835 | */ | |
965c8e59 | 836 | static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) |
124e68e7 SW |
837 | { |
838 | struct inode *inode = file->f_mapping->host; | |
839 | int ret; | |
840 | ||
841 | mutex_lock(&inode->i_mutex); | |
6a82c47a | 842 | |
965c8e59 | 843 | if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { |
124e68e7 SW |
844 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE); |
845 | if (ret < 0) { | |
846 | offset = ret; | |
847 | goto out; | |
848 | } | |
06222e49 JB |
849 | } |
850 | ||
965c8e59 | 851 | switch (whence) { |
06222e49 | 852 | case SEEK_END: |
124e68e7 SW |
853 | offset += inode->i_size; |
854 | break; | |
855 | case SEEK_CUR: | |
856 | /* | |
857 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
858 | * position-querying operation. Avoid rewriting the "same" | |
859 | * f_pos value back to the file because a concurrent read(), | |
860 | * write() or lseek() might have altered it | |
861 | */ | |
862 | if (offset == 0) { | |
863 | offset = file->f_pos; | |
864 | goto out; | |
865 | } | |
866 | offset += file->f_pos; | |
867 | break; | |
06222e49 JB |
868 | case SEEK_DATA: |
869 | if (offset >= inode->i_size) { | |
870 | ret = -ENXIO; | |
871 | goto out; | |
872 | } | |
873 | break; | |
874 | case SEEK_HOLE: | |
875 | if (offset >= inode->i_size) { | |
876 | ret = -ENXIO; | |
877 | goto out; | |
878 | } | |
879 | offset = inode->i_size; | |
880 | break; | |
124e68e7 SW |
881 | } |
882 | ||
46a1c2c7 | 883 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
124e68e7 SW |
884 | |
885 | out: | |
886 | mutex_unlock(&inode->i_mutex); | |
887 | return offset; | |
888 | } | |
889 | ||
ad7a60de LW |
890 | static inline void ceph_zero_partial_page( |
891 | struct inode *inode, loff_t offset, unsigned size) | |
892 | { | |
893 | struct page *page; | |
894 | pgoff_t index = offset >> PAGE_CACHE_SHIFT; | |
895 | ||
896 | page = find_lock_page(inode->i_mapping, index); | |
897 | if (page) { | |
898 | wait_on_page_writeback(page); | |
899 | zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size); | |
900 | unlock_page(page); | |
901 | page_cache_release(page); | |
902 | } | |
903 | } | |
904 | ||
905 | static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, | |
906 | loff_t length) | |
907 | { | |
908 | loff_t nearly = round_up(offset, PAGE_CACHE_SIZE); | |
909 | if (offset < nearly) { | |
910 | loff_t size = nearly - offset; | |
911 | if (length < size) | |
912 | size = length; | |
913 | ceph_zero_partial_page(inode, offset, size); | |
914 | offset += size; | |
915 | length -= size; | |
916 | } | |
917 | if (length >= PAGE_CACHE_SIZE) { | |
918 | loff_t size = round_down(length, PAGE_CACHE_SIZE); | |
919 | truncate_pagecache_range(inode, offset, offset + size - 1); | |
920 | offset += size; | |
921 | length -= size; | |
922 | } | |
923 | if (length) | |
924 | ceph_zero_partial_page(inode, offset, length); | |
925 | } | |
926 | ||
927 | static int ceph_zero_partial_object(struct inode *inode, | |
928 | loff_t offset, loff_t *length) | |
929 | { | |
930 | struct ceph_inode_info *ci = ceph_inode(inode); | |
931 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
932 | struct ceph_osd_request *req; | |
933 | int ret = 0; | |
934 | loff_t zero = 0; | |
935 | int op; | |
936 | ||
937 | if (!length) { | |
938 | op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; | |
939 | length = &zero; | |
940 | } else { | |
941 | op = CEPH_OSD_OP_ZERO; | |
942 | } | |
943 | ||
944 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
945 | ceph_vino(inode), | |
946 | offset, length, | |
947 | 1, op, | |
948 | CEPH_OSD_FLAG_WRITE | | |
949 | CEPH_OSD_FLAG_ONDISK, | |
950 | NULL, 0, 0, false); | |
951 | if (IS_ERR(req)) { | |
952 | ret = PTR_ERR(req); | |
953 | goto out; | |
954 | } | |
955 | ||
956 | ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap, | |
957 | &inode->i_mtime); | |
958 | ||
959 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); | |
960 | if (!ret) { | |
961 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
962 | if (ret == -ENOENT) | |
963 | ret = 0; | |
964 | } | |
965 | ceph_osdc_put_request(req); | |
966 | ||
967 | out: | |
968 | return ret; | |
969 | } | |
970 | ||
971 | static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) | |
972 | { | |
973 | int ret = 0; | |
974 | struct ceph_inode_info *ci = ceph_inode(inode); | |
b314a90d SW |
975 | s32 stripe_unit = ceph_file_layout_su(ci->i_layout); |
976 | s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); | |
977 | s32 object_size = ceph_file_layout_object_size(ci->i_layout); | |
978 | u64 object_set_size = object_size * stripe_count; | |
979 | u64 nearly, t; | |
980 | ||
981 | /* round offset up to next period boundary */ | |
982 | nearly = offset + object_set_size - 1; | |
983 | t = nearly; | |
984 | nearly -= do_div(t, object_set_size); | |
ad7a60de | 985 | |
ad7a60de LW |
986 | while (length && offset < nearly) { |
987 | loff_t size = length; | |
988 | ret = ceph_zero_partial_object(inode, offset, &size); | |
989 | if (ret < 0) | |
990 | return ret; | |
991 | offset += size; | |
992 | length -= size; | |
993 | } | |
994 | while (length >= object_set_size) { | |
995 | int i; | |
996 | loff_t pos = offset; | |
997 | for (i = 0; i < stripe_count; ++i) { | |
998 | ret = ceph_zero_partial_object(inode, pos, NULL); | |
999 | if (ret < 0) | |
1000 | return ret; | |
1001 | pos += stripe_unit; | |
1002 | } | |
1003 | offset += object_set_size; | |
1004 | length -= object_set_size; | |
1005 | } | |
1006 | while (length) { | |
1007 | loff_t size = length; | |
1008 | ret = ceph_zero_partial_object(inode, offset, &size); | |
1009 | if (ret < 0) | |
1010 | return ret; | |
1011 | offset += size; | |
1012 | length -= size; | |
1013 | } | |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | static long ceph_fallocate(struct file *file, int mode, | |
1018 | loff_t offset, loff_t length) | |
1019 | { | |
1020 | struct ceph_file_info *fi = file->private_data; | |
1021 | struct inode *inode = file->f_dentry->d_inode; | |
1022 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1023 | struct ceph_osd_client *osdc = | |
1024 | &ceph_inode_to_client(inode)->client->osdc; | |
1025 | int want, got = 0; | |
1026 | int dirty; | |
1027 | int ret = 0; | |
1028 | loff_t endoff = 0; | |
1029 | loff_t size; | |
1030 | ||
1031 | if (!S_ISREG(inode->i_mode)) | |
1032 | return -EOPNOTSUPP; | |
1033 | ||
1034 | if (IS_SWAPFILE(inode)) | |
1035 | return -ETXTBSY; | |
1036 | ||
1037 | mutex_lock(&inode->i_mutex); | |
1038 | ||
1039 | if (ceph_snap(inode) != CEPH_NOSNAP) { | |
1040 | ret = -EROFS; | |
1041 | goto unlock; | |
1042 | } | |
1043 | ||
1044 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) && | |
1045 | !(mode & FALLOC_FL_PUNCH_HOLE)) { | |
1046 | ret = -ENOSPC; | |
1047 | goto unlock; | |
1048 | } | |
1049 | ||
1050 | size = i_size_read(inode); | |
1051 | if (!(mode & FALLOC_FL_KEEP_SIZE)) | |
1052 | endoff = offset + length; | |
1053 | ||
1054 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1055 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1056 | else | |
1057 | want = CEPH_CAP_FILE_BUFFER; | |
1058 | ||
1059 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff); | |
1060 | if (ret < 0) | |
1061 | goto unlock; | |
1062 | ||
1063 | if (mode & FALLOC_FL_PUNCH_HOLE) { | |
1064 | if (offset < size) | |
1065 | ceph_zero_pagecache_range(inode, offset, length); | |
1066 | ret = ceph_zero_objects(inode, offset, length); | |
1067 | } else if (endoff > size) { | |
1068 | truncate_pagecache_range(inode, size, -1); | |
1069 | if (ceph_inode_set_size(inode, endoff)) | |
1070 | ceph_check_caps(ceph_inode(inode), | |
1071 | CHECK_CAPS_AUTHONLY, NULL); | |
1072 | } | |
1073 | ||
1074 | if (!ret) { | |
1075 | spin_lock(&ci->i_ceph_lock); | |
1076 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); | |
1077 | spin_unlock(&ci->i_ceph_lock); | |
1078 | if (dirty) | |
1079 | __mark_inode_dirty(inode, dirty); | |
1080 | } | |
1081 | ||
1082 | ceph_put_cap_refs(ci, got); | |
1083 | unlock: | |
1084 | mutex_unlock(&inode->i_mutex); | |
1085 | return ret; | |
1086 | } | |
1087 | ||
124e68e7 SW |
1088 | const struct file_operations ceph_file_fops = { |
1089 | .open = ceph_open, | |
1090 | .release = ceph_release, | |
1091 | .llseek = ceph_llseek, | |
1092 | .read = do_sync_read, | |
1093 | .write = do_sync_write, | |
1094 | .aio_read = ceph_aio_read, | |
1095 | .aio_write = ceph_aio_write, | |
1096 | .mmap = ceph_mmap, | |
1097 | .fsync = ceph_fsync, | |
40819f6f GF |
1098 | .lock = ceph_lock, |
1099 | .flock = ceph_flock, | |
124e68e7 SW |
1100 | .splice_read = generic_file_splice_read, |
1101 | .splice_write = generic_file_splice_write, | |
1102 | .unlocked_ioctl = ceph_ioctl, | |
1103 | .compat_ioctl = ceph_ioctl, | |
ad7a60de | 1104 | .fallocate = ceph_fallocate, |
124e68e7 SW |
1105 | }; |
1106 |