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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
124e68e7 | 2 | |
3d14c5d2 | 3 | #include <linux/module.h> |
124e68e7 | 4 | #include <linux/sched.h> |
5a0e3ad6 | 5 | #include <linux/slab.h> |
124e68e7 | 6 | #include <linux/file.h> |
5ef50c3b | 7 | #include <linux/mount.h> |
124e68e7 SW |
8 | #include <linux/namei.h> |
9 | #include <linux/writeback.h> | |
ad7a60de | 10 | #include <linux/falloc.h> |
124e68e7 SW |
11 | |
12 | #include "super.h" | |
13 | #include "mds_client.h" | |
99ccbd22 | 14 | #include "cache.h" |
124e68e7 SW |
15 | |
16 | /* | |
17 | * Ceph file operations | |
18 | * | |
19 | * Implement basic open/close functionality, and implement | |
20 | * read/write. | |
21 | * | |
22 | * We implement three modes of file I/O: | |
23 | * - buffered uses the generic_file_aio_{read,write} helpers | |
24 | * | |
25 | * - synchronous is used when there is multi-client read/write | |
26 | * sharing, avoids the page cache, and synchronously waits for an | |
27 | * ack from the OSD. | |
28 | * | |
29 | * - direct io takes the variant of the sync path that references | |
30 | * user pages directly. | |
31 | * | |
32 | * fsync() flushes and waits on dirty pages, but just queues metadata | |
33 | * for writeback: since the MDS can recover size and mtime there is no | |
34 | * need to wait for MDS acknowledgement. | |
35 | */ | |
36 | ||
37 | ||
38 | /* | |
39 | * Prepare an open request. Preallocate ceph_cap to avoid an | |
40 | * inopportune ENOMEM later. | |
41 | */ | |
42 | static struct ceph_mds_request * | |
43 | prepare_open_request(struct super_block *sb, int flags, int create_mode) | |
44 | { | |
3d14c5d2 YS |
45 | struct ceph_fs_client *fsc = ceph_sb_to_client(sb); |
46 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
47 | struct ceph_mds_request *req; |
48 | int want_auth = USE_ANY_MDS; | |
49 | int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN; | |
50 | ||
51 | if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC)) | |
52 | want_auth = USE_AUTH_MDS; | |
53 | ||
54 | req = ceph_mdsc_create_request(mdsc, op, want_auth); | |
55 | if (IS_ERR(req)) | |
56 | goto out; | |
57 | req->r_fmode = ceph_flags_to_mode(flags); | |
58 | req->r_args.open.flags = cpu_to_le32(flags); | |
59 | req->r_args.open.mode = cpu_to_le32(create_mode); | |
124e68e7 SW |
60 | out: |
61 | return req; | |
62 | } | |
63 | ||
64 | /* | |
65 | * initialize private struct file data. | |
66 | * if we fail, clean up by dropping fmode reference on the ceph_inode | |
67 | */ | |
68 | static int ceph_init_file(struct inode *inode, struct file *file, int fmode) | |
69 | { | |
70 | struct ceph_file_info *cf; | |
71 | int ret = 0; | |
99ccbd22 MT |
72 | struct ceph_inode_info *ci = ceph_inode(inode); |
73 | struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); | |
74 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 SW |
75 | |
76 | switch (inode->i_mode & S_IFMT) { | |
77 | case S_IFREG: | |
99ccbd22 MT |
78 | /* First file open request creates the cookie, we want to keep |
79 | * this cookie around for the filetime of the inode as not to | |
80 | * have to worry about fscache register / revoke / operation | |
81 | * races. | |
82 | * | |
83 | * Also, if we know the operation is going to invalidate data | |
84 | * (non readonly) just nuke the cache right away. | |
85 | */ | |
86 | ceph_fscache_register_inode_cookie(mdsc->fsc, ci); | |
87 | if ((fmode & CEPH_FILE_MODE_WR)) | |
88 | ceph_fscache_invalidate(inode); | |
124e68e7 SW |
89 | case S_IFDIR: |
90 | dout("init_file %p %p 0%o (regular)\n", inode, file, | |
91 | inode->i_mode); | |
687265e5 | 92 | cf = kmem_cache_alloc(ceph_file_cachep, GFP_KERNEL | __GFP_ZERO); |
124e68e7 SW |
93 | if (cf == NULL) { |
94 | ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */ | |
95 | return -ENOMEM; | |
96 | } | |
97 | cf->fmode = fmode; | |
98 | cf->next_offset = 2; | |
fdd4e158 | 99 | cf->readdir_cache_idx = -1; |
124e68e7 SW |
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; | |
124e68e7 SW |
139 | int err; |
140 | int flags, fmode, wanted; | |
141 | ||
142 | if (cf) { | |
143 | dout("open file %p is already opened\n", file); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */ | |
148 | flags = file->f_flags & ~(O_CREAT|O_EXCL); | |
149 | if (S_ISDIR(inode->i_mode)) | |
150 | flags = O_DIRECTORY; /* mds likes to know */ | |
151 | ||
152 | dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode, | |
153 | ceph_vinop(inode), file, flags, file->f_flags); | |
154 | fmode = ceph_flags_to_mode(flags); | |
155 | wanted = ceph_caps_for_mode(fmode); | |
156 | ||
157 | /* snapped files are read-only */ | |
158 | if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE)) | |
159 | return -EROFS; | |
160 | ||
161 | /* trivially open snapdir */ | |
162 | if (ceph_snap(inode) == CEPH_SNAPDIR) { | |
be655596 | 163 | spin_lock(&ci->i_ceph_lock); |
124e68e7 | 164 | __ceph_get_fmode(ci, fmode); |
be655596 | 165 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
166 | return ceph_init_file(inode, file, fmode); |
167 | } | |
168 | ||
169 | /* | |
7421ab80 SW |
170 | * No need to block if we have caps on the auth MDS (for |
171 | * write) or any MDS (for read). Update wanted set | |
124e68e7 SW |
172 | * asynchronously. |
173 | */ | |
be655596 | 174 | spin_lock(&ci->i_ceph_lock); |
7421ab80 SW |
175 | if (__ceph_is_any_real_caps(ci) && |
176 | (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { | |
124e68e7 SW |
177 | int mds_wanted = __ceph_caps_mds_wanted(ci); |
178 | int issued = __ceph_caps_issued(ci, NULL); | |
179 | ||
180 | dout("open %p fmode %d want %s issued %s using existing\n", | |
181 | inode, fmode, ceph_cap_string(wanted), | |
182 | ceph_cap_string(issued)); | |
183 | __ceph_get_fmode(ci, fmode); | |
be655596 | 184 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
185 | |
186 | /* adjust wanted? */ | |
187 | if ((issued & wanted) != wanted && | |
188 | (mds_wanted & wanted) != wanted && | |
189 | ceph_snap(inode) != CEPH_SNAPDIR) | |
190 | ceph_check_caps(ci, 0, NULL); | |
191 | ||
192 | return ceph_init_file(inode, file, fmode); | |
193 | } else if (ceph_snap(inode) != CEPH_NOSNAP && | |
194 | (ci->i_snap_caps & wanted) == wanted) { | |
195 | __ceph_get_fmode(ci, fmode); | |
be655596 | 196 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
197 | return ceph_init_file(inode, file, fmode); |
198 | } | |
99ccbd22 | 199 | |
be655596 | 200 | spin_unlock(&ci->i_ceph_lock); |
124e68e7 SW |
201 | |
202 | dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); | |
203 | req = prepare_open_request(inode->i_sb, flags, 0); | |
204 | if (IS_ERR(req)) { | |
205 | err = PTR_ERR(req); | |
206 | goto out; | |
207 | } | |
70b666c3 SW |
208 | req->r_inode = inode; |
209 | ihold(inode); | |
99ccbd22 | 210 | |
124e68e7 | 211 | req->r_num_caps = 1; |
e36d571d | 212 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
124e68e7 SW |
213 | if (!err) |
214 | err = ceph_init_file(inode, file, req->r_fmode); | |
215 | ceph_mdsc_put_request(req); | |
216 | dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode)); | |
217 | out: | |
218 | return err; | |
219 | } | |
220 | ||
221 | ||
222 | /* | |
5ef50c3b SW |
223 | * Do a lookup + open with a single request. If we get a non-existent |
224 | * file or symlink, return 1 so the VFS can retry. | |
124e68e7 | 225 | */ |
5ef50c3b | 226 | int ceph_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 227 | struct file *file, unsigned flags, umode_t mode, |
d9585277 | 228 | int *opened) |
124e68e7 | 229 | { |
3d14c5d2 YS |
230 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
231 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
124e68e7 | 232 | struct ceph_mds_request *req; |
5ef50c3b | 233 | struct dentry *dn; |
b1ee94aa | 234 | struct ceph_acls_info acls = {}; |
124e68e7 | 235 | int err; |
124e68e7 | 236 | |
a455589f AV |
237 | dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", |
238 | dir, dentry, dentry, | |
5ef50c3b SW |
239 | d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); |
240 | ||
241 | if (dentry->d_name.len > NAME_MAX) | |
242 | return -ENAMETOOLONG; | |
243 | ||
244 | err = ceph_init_dentry(dentry); | |
245 | if (err < 0) | |
246 | return err; | |
124e68e7 | 247 | |
b1ee94aa YZ |
248 | if (flags & O_CREAT) { |
249 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
250 | if (err < 0) | |
251 | return err; | |
252 | } | |
253 | ||
124e68e7 SW |
254 | /* do the open */ |
255 | req = prepare_open_request(dir->i_sb, flags, mode); | |
b1ee94aa YZ |
256 | if (IS_ERR(req)) { |
257 | err = PTR_ERR(req); | |
258 | goto out_acl; | |
259 | } | |
124e68e7 SW |
260 | req->r_dentry = dget(dentry); |
261 | req->r_num_caps = 2; | |
262 | if (flags & O_CREAT) { | |
263 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
264 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
265 | if (acls.pagelist) { |
266 | req->r_pagelist = acls.pagelist; | |
267 | acls.pagelist = NULL; | |
268 | } | |
124e68e7 SW |
269 | } |
270 | req->r_locked_dir = dir; /* caller holds dir->i_mutex */ | |
acda7657 SW |
271 | err = ceph_mdsc_do_request(mdsc, |
272 | (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, | |
273 | req); | |
bf91c315 | 274 | err = ceph_handle_snapdir(req, dentry, err); |
79aec984 | 275 | if (err) |
b1ee94aa | 276 | goto out_req; |
79aec984 | 277 | |
a43137f7 | 278 | if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry) |
124e68e7 | 279 | err = ceph_handle_notrace_create(dir, dentry); |
2d83bde9 | 280 | |
5ef50c3b SW |
281 | if (d_unhashed(dentry)) { |
282 | dn = ceph_finish_lookup(req, dentry, err); | |
283 | if (IS_ERR(dn)) | |
284 | err = PTR_ERR(dn); | |
285 | } else { | |
286 | /* we were given a hashed negative dentry */ | |
287 | dn = NULL; | |
288 | } | |
289 | if (err) | |
b1ee94aa | 290 | goto out_req; |
2b0143b5 | 291 | if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) { |
5ef50c3b SW |
292 | /* make vfs retry on splice, ENOENT, or symlink */ |
293 | dout("atomic_open finish_no_open on dn %p\n", dn); | |
294 | err = finish_no_open(file, dn); | |
295 | } else { | |
296 | dout("atomic_open finish_open on dn %p\n", dn); | |
6e8575fa | 297 | if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { |
2b0143b5 | 298 | ceph_init_inode_acls(d_inode(dentry), &acls); |
6e8575fa SL |
299 | *opened |= FILE_CREATED; |
300 | } | |
5ef50c3b SW |
301 | err = finish_open(file, dentry, ceph_open, opened); |
302 | } | |
b1ee94aa | 303 | out_req: |
ab866549 YZ |
304 | if (!req->r_err && req->r_target_inode) |
305 | ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); | |
5ef50c3b | 306 | ceph_mdsc_put_request(req); |
b1ee94aa YZ |
307 | out_acl: |
308 | ceph_release_acls_info(&acls); | |
5ef50c3b | 309 | dout("atomic_open result=%d\n", err); |
d9585277 | 310 | return err; |
124e68e7 SW |
311 | } |
312 | ||
313 | int ceph_release(struct inode *inode, struct file *file) | |
314 | { | |
315 | struct ceph_inode_info *ci = ceph_inode(inode); | |
316 | struct ceph_file_info *cf = file->private_data; | |
317 | ||
318 | dout("release inode %p file %p\n", inode, file); | |
319 | ceph_put_fmode(ci, cf->fmode); | |
320 | if (cf->last_readdir) | |
321 | ceph_mdsc_put_request(cf->last_readdir); | |
322 | kfree(cf->last_name); | |
323 | kfree(cf->dir_info); | |
124e68e7 | 324 | kmem_cache_free(ceph_file_cachep, cf); |
195d3ce2 SW |
325 | |
326 | /* wake up anyone waiting for caps on this inode */ | |
03066f23 | 327 | wake_up_all(&ci->i_cap_wq); |
124e68e7 SW |
328 | return 0; |
329 | } | |
330 | ||
83701246 YZ |
331 | enum { |
332 | CHECK_EOF = 1, | |
333 | READ_INLINE = 2, | |
334 | }; | |
335 | ||
124e68e7 SW |
336 | /* |
337 | * Read a range of bytes striped over one or more objects. Iterate over | |
338 | * objects we stripe over. (That's not atomic, but good enough for now.) | |
339 | * | |
340 | * If we get a short result from the OSD, check against i_size; we need to | |
341 | * only return a short read to the caller if we hit EOF. | |
342 | */ | |
343 | static int striped_read(struct inode *inode, | |
344 | u64 off, u64 len, | |
6a026589 | 345 | struct page **pages, int num_pages, |
c3cd6283 | 346 | int *checkeof, bool o_direct, |
ab226e21 | 347 | unsigned long buf_align) |
124e68e7 | 348 | { |
3d14c5d2 | 349 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 | 350 | struct ceph_inode_info *ci = ceph_inode(inode); |
688bac46 | 351 | u64 pos, this_len, left; |
b7495fc2 | 352 | int io_align, page_align; |
688bac46 | 353 | int pages_left; |
124e68e7 SW |
354 | int read; |
355 | struct page **page_pos; | |
356 | int ret; | |
357 | bool hit_stripe, was_short; | |
358 | ||
359 | /* | |
360 | * we may need to do multiple reads. not atomic, unfortunately. | |
361 | */ | |
362 | pos = off; | |
363 | left = len; | |
364 | page_pos = pages; | |
365 | pages_left = num_pages; | |
366 | read = 0; | |
b7495fc2 | 367 | io_align = off & ~PAGE_MASK; |
124e68e7 SW |
368 | |
369 | more: | |
c3cd6283 | 370 | if (o_direct) |
ab226e21 | 371 | page_align = (pos - io_align + buf_align) & ~PAGE_MASK; |
b7495fc2 SW |
372 | else |
373 | page_align = pos & ~PAGE_MASK; | |
124e68e7 | 374 | this_len = left; |
3d14c5d2 | 375 | ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
124e68e7 SW |
376 | &ci->i_layout, pos, &this_len, |
377 | ci->i_truncate_seq, | |
378 | ci->i_truncate_size, | |
b7495fc2 | 379 | page_pos, pages_left, page_align); |
124e68e7 SW |
380 | if (ret == -ENOENT) |
381 | ret = 0; | |
0e98728f SW |
382 | hit_stripe = this_len < left; |
383 | was_short = ret >= 0 && ret < this_len; | |
688bac46 | 384 | dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, |
124e68e7 SW |
385 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); |
386 | ||
02ae66d8 | 387 | if (ret >= 0) { |
388 | int didpages; | |
389 | if (was_short && (pos + ret < inode->i_size)) { | |
1487a688 YZ |
390 | int zlen = min(this_len - ret, |
391 | inode->i_size - pos - ret); | |
392 | int zoff = (o_direct ? buf_align : io_align) + | |
393 | read + ret; | |
02ae66d8 | 394 | dout(" zero gap %llu to %llu\n", |
1487a688 YZ |
395 | pos + ret, pos + ret + zlen); |
396 | ceph_zero_page_vector_range(zoff, zlen, pages); | |
397 | ret += zlen; | |
124e68e7 | 398 | } |
02ae66d8 | 399 | |
400 | didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; | |
124e68e7 SW |
401 | pos += ret; |
402 | read = pos - off; | |
403 | left -= ret; | |
404 | page_pos += didpages; | |
405 | pages_left -= didpages; | |
406 | ||
02ae66d8 | 407 | /* hit stripe and need continue*/ |
408 | if (left && hit_stripe && pos < inode->i_size) | |
124e68e7 SW |
409 | goto more; |
410 | } | |
411 | ||
ee7289bf | 412 | if (read > 0) { |
02ae66d8 | 413 | ret = read; |
c3cd6283 SW |
414 | /* did we bounce off eof? */ |
415 | if (pos + left > inode->i_size) | |
83701246 | 416 | *checkeof = CHECK_EOF; |
124e68e7 SW |
417 | } |
418 | ||
124e68e7 SW |
419 | dout("striped_read returns %d\n", ret); |
420 | return ret; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Completely synchronous read and write methods. Direct from __user | |
425 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
426 | * | |
427 | * If the read spans object boundary, just do multiple reads. | |
428 | */ | |
8eb4efb0 | 429 | static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i, |
430 | int *checkeof) | |
124e68e7 | 431 | { |
8eb4efb0 | 432 | struct file *file = iocb->ki_filp; |
496ad9aa | 433 | struct inode *inode = file_inode(file); |
124e68e7 | 434 | struct page **pages; |
8eb4efb0 | 435 | u64 off = iocb->ki_pos; |
ab226e21 | 436 | int num_pages, ret; |
2b777c9d | 437 | size_t len = iov_iter_count(i); |
124e68e7 | 438 | |
8eb4efb0 | 439 | dout("sync_read on file %p %llu~%u %s\n", file, off, |
440 | (unsigned)len, | |
124e68e7 | 441 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
d0d0db22 YZ |
442 | |
443 | if (!len) | |
444 | return 0; | |
e98b6fed SW |
445 | /* |
446 | * flush any page cache pages in this range. this | |
447 | * will make concurrent normal and sync io slow, | |
448 | * but it will at least behave sensibly when they are | |
449 | * in sequence. | |
450 | */ | |
8eb4efb0 | 451 | ret = filemap_write_and_wait_range(inode->i_mapping, off, |
452 | off + len); | |
29065a51 | 453 | if (ret < 0) |
8eb4efb0 | 454 | return ret; |
29065a51 | 455 | |
2ba48ce5 | 456 | if (iocb->ki_flags & IOCB_DIRECT) { |
8eb4efb0 | 457 | while (iov_iter_count(i)) { |
2b777c9d AV |
458 | size_t start; |
459 | ssize_t n; | |
8eb4efb0 | 460 | |
2b777c9d AV |
461 | n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start); |
462 | if (n < 0) | |
463 | return n; | |
8eb4efb0 | 464 | |
2b777c9d AV |
465 | num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; |
466 | ||
467 | ret = striped_read(inode, off, n, | |
8eb4efb0 | 468 | pages, num_pages, checkeof, |
2b777c9d AV |
469 | 1, start); |
470 | ||
8eb4efb0 | 471 | ceph_put_page_vector(pages, num_pages, true); |
472 | ||
473 | if (ret <= 0) | |
474 | break; | |
475 | off += ret; | |
476 | iov_iter_advance(i, ret); | |
2b777c9d | 477 | if (ret < n) |
8eb4efb0 | 478 | break; |
479 | } | |
480 | } else { | |
481 | num_pages = calc_pages_for(off, len); | |
687265e5 | 482 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
8eb4efb0 | 483 | if (IS_ERR(pages)) |
484 | return PTR_ERR(pages); | |
485 | ret = striped_read(inode, off, len, pages, | |
486 | num_pages, checkeof, 0, 0); | |
487 | if (ret > 0) { | |
488 | int l, k = 0; | |
2b777c9d | 489 | size_t left = ret; |
8eb4efb0 | 490 | |
491 | while (left) { | |
5aaa432a YZ |
492 | size_t page_off = off & ~PAGE_MASK; |
493 | size_t copy = min_t(size_t, | |
494 | PAGE_SIZE - page_off, left); | |
495 | l = copy_page_to_iter(pages[k++], page_off, | |
496 | copy, i); | |
2b777c9d AV |
497 | off += l; |
498 | left -= l; | |
499 | if (l < copy) | |
8eb4efb0 | 500 | break; |
501 | } | |
502 | } | |
503 | ceph_release_page_vector(pages, num_pages); | |
504 | } | |
124e68e7 | 505 | |
8eb4efb0 | 506 | if (off > iocb->ki_pos) { |
507 | ret = off - iocb->ki_pos; | |
508 | iocb->ki_pos = off; | |
509 | } | |
124e68e7 | 510 | |
124e68e7 SW |
511 | dout("sync_read result %d\n", ret); |
512 | return ret; | |
513 | } | |
514 | ||
515 | /* | |
26be8808 AE |
516 | * Write commit request unsafe callback, called to tell us when a |
517 | * request is unsafe (that is, in flight--has been handed to the | |
518 | * messenger to send to its target osd). It is called again when | |
519 | * we've received a response message indicating the request is | |
520 | * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request | |
521 | * is completed early (and unsuccessfully) due to a timeout or | |
522 | * interrupt. | |
523 | * | |
524 | * This is used if we requested both an ACK and ONDISK commit reply | |
525 | * from the OSD. | |
124e68e7 | 526 | */ |
26be8808 | 527 | static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) |
124e68e7 SW |
528 | { |
529 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
530 | ||
26be8808 AE |
531 | dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, |
532 | unsafe ? "un" : ""); | |
533 | if (unsafe) { | |
534 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
535 | spin_lock(&ci->i_unsafe_lock); | |
536 | list_add_tail(&req->r_unsafe_item, | |
537 | &ci->i_unsafe_writes); | |
538 | spin_unlock(&ci->i_unsafe_lock); | |
539 | } else { | |
540 | spin_lock(&ci->i_unsafe_lock); | |
541 | list_del_init(&req->r_unsafe_item); | |
542 | spin_unlock(&ci->i_unsafe_lock); | |
543 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
544 | } | |
124e68e7 SW |
545 | } |
546 | ||
e8344e66 | 547 | |
124e68e7 | 548 | /* |
e8344e66 | 549 | * Synchronous write, straight from __user pointer or user pages. |
124e68e7 SW |
550 | * |
551 | * If write spans object boundary, just do multiple writes. (For a | |
552 | * correct atomic write, we should e.g. take write locks on all | |
553 | * objects, rollback on failure, etc.) | |
554 | */ | |
e8344e66 | 555 | static ssize_t |
5dda377c YZ |
556 | ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, |
557 | struct ceph_snap_context *snapc) | |
124e68e7 | 558 | { |
e8344e66 | 559 | struct file *file = iocb->ki_filp; |
496ad9aa | 560 | struct inode *inode = file_inode(file); |
124e68e7 | 561 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 562 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
acead002 | 563 | struct ceph_vino vino; |
124e68e7 SW |
564 | struct ceph_osd_request *req; |
565 | struct page **pages; | |
566 | int num_pages; | |
124e68e7 SW |
567 | int written = 0; |
568 | int flags; | |
124e68e7 SW |
569 | int check_caps = 0; |
570 | int ret; | |
571 | struct timespec mtime = CURRENT_TIME; | |
4908b822 | 572 | size_t count = iov_iter_count(from); |
124e68e7 | 573 | |
496ad9aa | 574 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
124e68e7 SW |
575 | return -EROFS; |
576 | ||
e8344e66 | 577 | dout("sync_direct_write on file %p %lld~%u\n", file, pos, |
578 | (unsigned)count); | |
124e68e7 | 579 | |
e8344e66 | 580 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); |
29065a51 YS |
581 | if (ret < 0) |
582 | return ret; | |
583 | ||
584 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
585 | pos >> PAGE_CACHE_SHIFT, | |
e8344e66 | 586 | (pos + count) >> PAGE_CACHE_SHIFT); |
29065a51 YS |
587 | if (ret < 0) |
588 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
589 | ||
124e68e7 SW |
590 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
591 | CEPH_OSD_FLAG_ONDISK | | |
592 | CEPH_OSD_FLAG_WRITE; | |
124e68e7 | 593 | |
4908b822 AV |
594 | while (iov_iter_count(from) > 0) { |
595 | u64 len = iov_iter_single_seg_count(from); | |
64c31311 AV |
596 | size_t start; |
597 | ssize_t n; | |
e8344e66 | 598 | |
e8344e66 | 599 | vino = ceph_vino(inode); |
600 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
715e4cd4 | 601 | vino, pos, &len, 0, |
e8344e66 | 602 | 2,/*include a 'startsync' command*/ |
603 | CEPH_OSD_OP_WRITE, flags, snapc, | |
604 | ci->i_truncate_seq, | |
605 | ci->i_truncate_size, | |
606 | false); | |
607 | if (IS_ERR(req)) { | |
608 | ret = PTR_ERR(req); | |
eab87235 | 609 | break; |
e8344e66 | 610 | } |
124e68e7 | 611 | |
144cba14 | 612 | osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0); |
715e4cd4 | 613 | |
4908b822 | 614 | n = iov_iter_get_pages_alloc(from, &pages, len, &start); |
64c31311 AV |
615 | if (unlikely(n < 0)) { |
616 | ret = n; | |
617 | ceph_osdc_put_request(req); | |
618 | break; | |
124e68e7 SW |
619 | } |
620 | ||
64c31311 | 621 | num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; |
124e68e7 SW |
622 | /* |
623 | * throw out any page cache pages in this range. this | |
624 | * may block. | |
625 | */ | |
213c99ee | 626 | truncate_inode_pages_range(inode->i_mapping, pos, |
64c31311 AV |
627 | (pos+n) | (PAGE_CACHE_SIZE-1)); |
628 | osd_req_op_extent_osd_data_pages(req, 0, pages, n, start, | |
e8344e66 | 629 | false, false); |
630 | ||
631 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ | |
632 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); | |
633 | ||
634 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); | |
635 | if (!ret) | |
636 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
637 | ||
638 | ceph_put_page_vector(pages, num_pages, false); | |
639 | ||
e8344e66 | 640 | ceph_osdc_put_request(req); |
64c31311 | 641 | if (ret) |
e8344e66 | 642 | break; |
64c31311 AV |
643 | pos += n; |
644 | written += n; | |
4908b822 | 645 | iov_iter_advance(from, n); |
64c31311 AV |
646 | |
647 | if (pos > i_size_read(inode)) { | |
648 | check_caps = ceph_inode_set_size(inode, pos); | |
649 | if (check_caps) | |
650 | ceph_check_caps(ceph_inode(inode), | |
651 | CHECK_CAPS_AUTHONLY, | |
652 | NULL); | |
653 | } | |
e8344e66 | 654 | } |
655 | ||
656 | if (ret != -EOLDSNAPC && written > 0) { | |
657 | iocb->ki_pos = pos; | |
658 | ret = written; | |
659 | } | |
660 | return ret; | |
661 | } | |
662 | ||
663 | ||
664 | /* | |
665 | * Synchronous write, straight from __user pointer or user pages. | |
666 | * | |
667 | * If write spans object boundary, just do multiple writes. (For a | |
668 | * correct atomic write, we should e.g. take write locks on all | |
669 | * objects, rollback on failure, etc.) | |
670 | */ | |
06fee30f | 671 | static ssize_t |
5dda377c YZ |
672 | ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, |
673 | struct ceph_snap_context *snapc) | |
e8344e66 | 674 | { |
675 | struct file *file = iocb->ki_filp; | |
676 | struct inode *inode = file_inode(file); | |
677 | struct ceph_inode_info *ci = ceph_inode(inode); | |
678 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
e8344e66 | 679 | struct ceph_vino vino; |
680 | struct ceph_osd_request *req; | |
681 | struct page **pages; | |
682 | u64 len; | |
683 | int num_pages; | |
684 | int written = 0; | |
685 | int flags; | |
686 | int check_caps = 0; | |
687 | int ret; | |
688 | struct timespec mtime = CURRENT_TIME; | |
4908b822 | 689 | size_t count = iov_iter_count(from); |
e8344e66 | 690 | |
691 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) | |
692 | return -EROFS; | |
693 | ||
694 | dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count); | |
695 | ||
696 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); | |
697 | if (ret < 0) | |
698 | return ret; | |
699 | ||
700 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
701 | pos >> PAGE_CACHE_SHIFT, | |
702 | (pos + count) >> PAGE_CACHE_SHIFT); | |
703 | if (ret < 0) | |
704 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
705 | ||
706 | flags = CEPH_OSD_FLAG_ORDERSNAP | | |
707 | CEPH_OSD_FLAG_ONDISK | | |
708 | CEPH_OSD_FLAG_WRITE | | |
709 | CEPH_OSD_FLAG_ACK; | |
710 | ||
4908b822 | 711 | while ((len = iov_iter_count(from)) > 0) { |
e8344e66 | 712 | size_t left; |
713 | int n; | |
714 | ||
e8344e66 | 715 | vino = ceph_vino(inode); |
716 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
715e4cd4 | 717 | vino, pos, &len, 0, 1, |
e8344e66 | 718 | CEPH_OSD_OP_WRITE, flags, snapc, |
719 | ci->i_truncate_seq, | |
720 | ci->i_truncate_size, | |
721 | false); | |
722 | if (IS_ERR(req)) { | |
723 | ret = PTR_ERR(req); | |
eab87235 | 724 | break; |
e8344e66 | 725 | } |
726 | ||
727 | /* | |
728 | * write from beginning of first page, | |
729 | * regardless of io alignment | |
730 | */ | |
731 | num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
732 | ||
687265e5 | 733 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
124e68e7 SW |
734 | if (IS_ERR(pages)) { |
735 | ret = PTR_ERR(pages); | |
736 | goto out; | |
737 | } | |
e8344e66 | 738 | |
739 | left = len; | |
740 | for (n = 0; n < num_pages; n++) { | |
125d725c | 741 | size_t plen = min_t(size_t, left, PAGE_SIZE); |
4908b822 | 742 | ret = copy_page_from_iter(pages[n], 0, plen, from); |
e8344e66 | 743 | if (ret != plen) { |
744 | ret = -EFAULT; | |
745 | break; | |
746 | } | |
747 | left -= ret; | |
e8344e66 | 748 | } |
749 | ||
124e68e7 SW |
750 | if (ret < 0) { |
751 | ceph_release_page_vector(pages, num_pages); | |
752 | goto out; | |
753 | } | |
754 | ||
e8344e66 | 755 | /* get a second commit callback */ |
756 | req->r_unsafe_callback = ceph_sync_write_unsafe; | |
757 | req->r_inode = inode; | |
124e68e7 | 758 | |
e8344e66 | 759 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, |
760 | false, true); | |
02ee07d3 | 761 | |
e8344e66 | 762 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ |
763 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); | |
124e68e7 | 764 | |
e8344e66 | 765 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
766 | if (!ret) | |
767 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
124e68e7 SW |
768 | |
769 | out: | |
e8344e66 | 770 | ceph_osdc_put_request(req); |
771 | if (ret == 0) { | |
772 | pos += len; | |
773 | written += len; | |
774 | ||
775 | if (pos > i_size_read(inode)) { | |
776 | check_caps = ceph_inode_set_size(inode, pos); | |
777 | if (check_caps) | |
778 | ceph_check_caps(ceph_inode(inode), | |
779 | CHECK_CAPS_AUTHONLY, | |
780 | NULL); | |
781 | } | |
782 | } else | |
783 | break; | |
784 | } | |
124e68e7 | 785 | |
e8344e66 | 786 | if (ret != -EOLDSNAPC && written > 0) { |
124e68e7 | 787 | ret = written; |
e8344e66 | 788 | iocb->ki_pos = pos; |
124e68e7 SW |
789 | } |
790 | return ret; | |
791 | } | |
792 | ||
793 | /* | |
794 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
795 | * Atomically grab references, so that those bits are not released | |
796 | * back to the MDS mid-read. | |
797 | * | |
798 | * Hmm, the sync read case isn't actually async... should it be? | |
799 | */ | |
3644424d | 800 | static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) |
124e68e7 SW |
801 | { |
802 | struct file *filp = iocb->ki_filp; | |
2962507c | 803 | struct ceph_file_info *fi = filp->private_data; |
66ee59af | 804 | size_t len = iov_iter_count(to); |
496ad9aa | 805 | struct inode *inode = file_inode(filp); |
124e68e7 | 806 | struct ceph_inode_info *ci = ceph_inode(inode); |
3738daa6 | 807 | struct page *pinned_page = NULL; |
124e68e7 | 808 | ssize_t ret; |
2962507c | 809 | int want, got = 0; |
83701246 | 810 | int retry_op = 0, read = 0; |
124e68e7 | 811 | |
6a026589 | 812 | again: |
8eb4efb0 | 813 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", |
814 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); | |
815 | ||
2962507c SW |
816 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
817 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
818 | else | |
819 | want = CEPH_CAP_FILE_CACHE; | |
3738daa6 | 820 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); |
124e68e7 | 821 | if (ret < 0) |
8eb4efb0 | 822 | return ret; |
124e68e7 | 823 | |
2962507c | 824 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
2ba48ce5 | 825 | (iocb->ki_flags & IOCB_DIRECT) || |
8eb4efb0 | 826 | (fi->flags & CEPH_F_SYNC)) { |
8eb4efb0 | 827 | |
828 | dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
829 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, | |
830 | ceph_cap_string(got)); | |
831 | ||
83701246 YZ |
832 | if (ci->i_inline_version == CEPH_INLINE_NONE) { |
833 | /* hmm, this isn't really async... */ | |
834 | ret = ceph_sync_read(iocb, to, &retry_op); | |
835 | } else { | |
836 | retry_op = READ_INLINE; | |
837 | } | |
8eb4efb0 | 838 | } else { |
8eb4efb0 | 839 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", |
3644424d | 840 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, |
8eb4efb0 | 841 | ceph_cap_string(got)); |
124e68e7 | 842 | |
3644424d | 843 | ret = generic_file_read_iter(iocb, to); |
8eb4efb0 | 844 | } |
124e68e7 SW |
845 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", |
846 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
3738daa6 YZ |
847 | if (pinned_page) { |
848 | page_cache_release(pinned_page); | |
849 | pinned_page = NULL; | |
850 | } | |
124e68e7 | 851 | ceph_put_cap_refs(ci, got); |
83701246 YZ |
852 | if (retry_op && ret >= 0) { |
853 | int statret; | |
854 | struct page *page = NULL; | |
855 | loff_t i_size; | |
856 | if (retry_op == READ_INLINE) { | |
687265e5 | 857 | page = __page_cache_alloc(GFP_KERNEL); |
83701246 YZ |
858 | if (!page) |
859 | return -ENOMEM; | |
860 | } | |
6a026589 | 861 | |
83701246 YZ |
862 | statret = __ceph_do_getattr(inode, page, |
863 | CEPH_STAT_CAP_INLINE_DATA, !!page); | |
864 | if (statret < 0) { | |
865 | __free_page(page); | |
866 | if (statret == -ENODATA) { | |
867 | BUG_ON(retry_op != READ_INLINE); | |
868 | goto again; | |
869 | } | |
870 | return statret; | |
871 | } | |
6a026589 | 872 | |
83701246 YZ |
873 | i_size = i_size_read(inode); |
874 | if (retry_op == READ_INLINE) { | |
fcc02d2a YZ |
875 | BUG_ON(ret > 0 || read > 0); |
876 | if (iocb->ki_pos < i_size && | |
877 | iocb->ki_pos < PAGE_CACHE_SIZE) { | |
83701246 YZ |
878 | loff_t end = min_t(loff_t, i_size, |
879 | iocb->ki_pos + len); | |
fcc02d2a | 880 | end = min_t(loff_t, end, PAGE_CACHE_SIZE); |
83701246 YZ |
881 | if (statret < end) |
882 | zero_user_segment(page, statret, end); | |
883 | ret = copy_page_to_iter(page, | |
884 | iocb->ki_pos & ~PAGE_MASK, | |
885 | end - iocb->ki_pos, to); | |
886 | iocb->ki_pos += ret; | |
fcc02d2a YZ |
887 | read += ret; |
888 | } | |
889 | if (iocb->ki_pos < i_size && read < len) { | |
890 | size_t zlen = min_t(size_t, len - read, | |
891 | i_size - iocb->ki_pos); | |
892 | ret = iov_iter_zero(zlen, to); | |
893 | iocb->ki_pos += ret; | |
894 | read += ret; | |
83701246 YZ |
895 | } |
896 | __free_pages(page, 0); | |
fcc02d2a | 897 | return read; |
83701246 | 898 | } |
6a026589 SW |
899 | |
900 | /* hit EOF or hole? */ | |
83701246 | 901 | if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && |
fcc02d2a | 902 | ret < len) { |
8eb4efb0 | 903 | dout("sync_read hit hole, ppos %lld < size %lld" |
904 | ", reading more\n", iocb->ki_pos, | |
905 | inode->i_size); | |
906 | ||
6a026589 | 907 | read += ret; |
6a026589 | 908 | len -= ret; |
83701246 | 909 | retry_op = 0; |
6a026589 SW |
910 | goto again; |
911 | } | |
912 | } | |
8eb4efb0 | 913 | |
6a026589 SW |
914 | if (ret >= 0) |
915 | ret += read; | |
916 | ||
124e68e7 SW |
917 | return ret; |
918 | } | |
919 | ||
920 | /* | |
921 | * Take cap references to avoid releasing caps to MDS mid-write. | |
922 | * | |
923 | * If we are synchronous, and write with an old snap context, the OSD | |
924 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
925 | * dropping our cap refs and allowing the pending snap to logically | |
926 | * complete _before_ this write occurs. | |
927 | * | |
928 | * If we are near ENOSPC, write synchronously. | |
929 | */ | |
4908b822 | 930 | static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) |
124e68e7 SW |
931 | { |
932 | struct file *file = iocb->ki_filp; | |
33caad32 | 933 | struct ceph_file_info *fi = file->private_data; |
496ad9aa | 934 | struct inode *inode = file_inode(file); |
124e68e7 | 935 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
936 | struct ceph_osd_client *osdc = |
937 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
f66fd9f0 | 938 | struct ceph_cap_flush *prealloc_cf; |
3309dd04 | 939 | ssize_t count, written = 0; |
03d254ed | 940 | int err, want, got; |
3309dd04 | 941 | loff_t pos; |
124e68e7 SW |
942 | |
943 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
944 | return -EROFS; | |
945 | ||
f66fd9f0 YZ |
946 | prealloc_cf = ceph_alloc_cap_flush(); |
947 | if (!prealloc_cf) | |
948 | return -ENOMEM; | |
949 | ||
03d254ed | 950 | mutex_lock(&inode->i_mutex); |
03d254ed | 951 | |
03d254ed | 952 | /* We can write back this queue in page reclaim */ |
de1414a6 | 953 | current->backing_dev_info = inode_to_bdi(inode); |
03d254ed | 954 | |
55b0b31c YZ |
955 | if (iocb->ki_flags & IOCB_APPEND) { |
956 | err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); | |
957 | if (err < 0) | |
958 | goto out; | |
959 | } | |
960 | ||
3309dd04 AV |
961 | err = generic_write_checks(iocb, from); |
962 | if (err <= 0) | |
03d254ed YZ |
963 | goto out; |
964 | ||
3309dd04 AV |
965 | pos = iocb->ki_pos; |
966 | count = iov_iter_count(from); | |
5fa8e0a1 | 967 | err = file_remove_privs(file); |
03d254ed YZ |
968 | if (err) |
969 | goto out; | |
970 | ||
971 | err = file_update_time(file); | |
972 | if (err) | |
973 | goto out; | |
974 | ||
28127bdd YZ |
975 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
976 | err = ceph_uninline_data(file, NULL); | |
977 | if (err < 0) | |
978 | goto out; | |
979 | } | |
980 | ||
124e68e7 | 981 | retry_snap: |
6070e0c1 | 982 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { |
03d254ed | 983 | err = -ENOSPC; |
6070e0c1 YZ |
984 | goto out; |
985 | } | |
03d254ed | 986 | |
ac7f29bf | 987 | dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", |
03d254ed | 988 | inode, ceph_vinop(inode), pos, count, inode->i_size); |
7971bd92 SW |
989 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
990 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
991 | else | |
992 | want = CEPH_CAP_FILE_BUFFER; | |
03d254ed | 993 | got = 0; |
3738daa6 YZ |
994 | err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count, |
995 | &got, NULL); | |
03d254ed | 996 | if (err < 0) |
37505d57 | 997 | goto out; |
124e68e7 | 998 | |
ac7f29bf | 999 | dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", |
03d254ed | 1000 | inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); |
7971bd92 SW |
1001 | |
1002 | if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || | |
2ba48ce5 | 1003 | (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) { |
5dda377c | 1004 | struct ceph_snap_context *snapc; |
4908b822 | 1005 | struct iov_iter data; |
37505d57 | 1006 | mutex_unlock(&inode->i_mutex); |
5dda377c YZ |
1007 | |
1008 | spin_lock(&ci->i_ceph_lock); | |
1009 | if (__ceph_have_pending_cap_snap(ci)) { | |
1010 | struct ceph_cap_snap *capsnap = | |
1011 | list_last_entry(&ci->i_cap_snaps, | |
1012 | struct ceph_cap_snap, | |
1013 | ci_item); | |
1014 | snapc = ceph_get_snap_context(capsnap->context); | |
1015 | } else { | |
1016 | BUG_ON(!ci->i_head_snapc); | |
1017 | snapc = ceph_get_snap_context(ci->i_head_snapc); | |
1018 | } | |
1019 | spin_unlock(&ci->i_ceph_lock); | |
1020 | ||
4908b822 AV |
1021 | /* we might need to revert back to that point */ |
1022 | data = *from; | |
2ba48ce5 | 1023 | if (iocb->ki_flags & IOCB_DIRECT) |
5dda377c YZ |
1024 | written = ceph_sync_direct_write(iocb, &data, pos, |
1025 | snapc); | |
e8344e66 | 1026 | else |
5dda377c | 1027 | written = ceph_sync_write(iocb, &data, pos, snapc); |
0e5dd45c | 1028 | if (written == -EOLDSNAPC) { |
1029 | dout("aio_write %p %llx.%llx %llu~%u" | |
1030 | "got EOLDSNAPC, retrying\n", | |
1031 | inode, ceph_vinop(inode), | |
4908b822 | 1032 | pos, (unsigned)count); |
0e5dd45c | 1033 | mutex_lock(&inode->i_mutex); |
0e5dd45c | 1034 | goto retry_snap; |
1035 | } | |
4908b822 AV |
1036 | if (written > 0) |
1037 | iov_iter_advance(from, written); | |
5dda377c | 1038 | ceph_put_snap_context(snapc); |
7971bd92 | 1039 | } else { |
32d3e148 | 1040 | loff_t old_size = inode->i_size; |
b0d7c223 YZ |
1041 | /* |
1042 | * No need to acquire the i_truncate_mutex. Because | |
1043 | * the MDS revokes Fwb caps before sending truncate | |
1044 | * message to us. We can't get Fwb cap while there | |
1045 | * are pending vmtruncate. So write and vmtruncate | |
1046 | * can not run at the same time | |
1047 | */ | |
4908b822 | 1048 | written = generic_perform_write(file, from, pos); |
aec605f4 AV |
1049 | if (likely(written >= 0)) |
1050 | iocb->ki_pos = pos + written; | |
32d3e148 YW |
1051 | if (inode->i_size > old_size) |
1052 | ceph_fscache_update_objectsize(inode); | |
6070e0c1 | 1053 | mutex_unlock(&inode->i_mutex); |
7971bd92 | 1054 | } |
d8de9ab6 | 1055 | |
03d254ed | 1056 | if (written >= 0) { |
fca65b4a | 1057 | int dirty; |
be655596 | 1058 | spin_lock(&ci->i_ceph_lock); |
28127bdd | 1059 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1060 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1061 | &prealloc_cf); | |
be655596 | 1062 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
1063 | if (dirty) |
1064 | __mark_inode_dirty(inode, dirty); | |
124e68e7 | 1065 | } |
7971bd92 | 1066 | |
124e68e7 | 1067 | dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", |
4908b822 | 1068 | inode, ceph_vinop(inode), pos, (unsigned)count, |
7971bd92 | 1069 | ceph_cap_string(got)); |
124e68e7 | 1070 | ceph_put_cap_refs(ci, got); |
7971bd92 | 1071 | |
03d254ed | 1072 | if (written >= 0 && |
6070e0c1 YZ |
1073 | ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || |
1074 | ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { | |
03d254ed | 1075 | err = vfs_fsync_range(file, pos, pos + written - 1, 1); |
6070e0c1 | 1076 | if (err < 0) |
03d254ed | 1077 | written = err; |
6070e0c1 | 1078 | } |
03d254ed | 1079 | |
2f75e9e1 SW |
1080 | goto out_unlocked; |
1081 | ||
03d254ed | 1082 | out: |
2f75e9e1 SW |
1083 | mutex_unlock(&inode->i_mutex); |
1084 | out_unlocked: | |
f66fd9f0 | 1085 | ceph_free_cap_flush(prealloc_cf); |
03d254ed | 1086 | current->backing_dev_info = NULL; |
03d254ed | 1087 | return written ? written : err; |
124e68e7 SW |
1088 | } |
1089 | ||
1090 | /* | |
1091 | * llseek. be sure to verify file size on SEEK_END. | |
1092 | */ | |
965c8e59 | 1093 | static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) |
124e68e7 SW |
1094 | { |
1095 | struct inode *inode = file->f_mapping->host; | |
1096 | int ret; | |
1097 | ||
1098 | mutex_lock(&inode->i_mutex); | |
6a82c47a | 1099 | |
965c8e59 | 1100 | if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { |
508b32d8 | 1101 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); |
124e68e7 SW |
1102 | if (ret < 0) { |
1103 | offset = ret; | |
1104 | goto out; | |
1105 | } | |
06222e49 JB |
1106 | } |
1107 | ||
965c8e59 | 1108 | switch (whence) { |
06222e49 | 1109 | case SEEK_END: |
124e68e7 SW |
1110 | offset += inode->i_size; |
1111 | break; | |
1112 | case SEEK_CUR: | |
1113 | /* | |
1114 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
1115 | * position-querying operation. Avoid rewriting the "same" | |
1116 | * f_pos value back to the file because a concurrent read(), | |
1117 | * write() or lseek() might have altered it | |
1118 | */ | |
1119 | if (offset == 0) { | |
1120 | offset = file->f_pos; | |
1121 | goto out; | |
1122 | } | |
1123 | offset += file->f_pos; | |
1124 | break; | |
06222e49 JB |
1125 | case SEEK_DATA: |
1126 | if (offset >= inode->i_size) { | |
1127 | ret = -ENXIO; | |
1128 | goto out; | |
1129 | } | |
1130 | break; | |
1131 | case SEEK_HOLE: | |
1132 | if (offset >= inode->i_size) { | |
1133 | ret = -ENXIO; | |
1134 | goto out; | |
1135 | } | |
1136 | offset = inode->i_size; | |
1137 | break; | |
124e68e7 SW |
1138 | } |
1139 | ||
46a1c2c7 | 1140 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
124e68e7 SW |
1141 | |
1142 | out: | |
1143 | mutex_unlock(&inode->i_mutex); | |
1144 | return offset; | |
1145 | } | |
1146 | ||
ad7a60de LW |
1147 | static inline void ceph_zero_partial_page( |
1148 | struct inode *inode, loff_t offset, unsigned size) | |
1149 | { | |
1150 | struct page *page; | |
1151 | pgoff_t index = offset >> PAGE_CACHE_SHIFT; | |
1152 | ||
1153 | page = find_lock_page(inode->i_mapping, index); | |
1154 | if (page) { | |
1155 | wait_on_page_writeback(page); | |
1156 | zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size); | |
1157 | unlock_page(page); | |
1158 | page_cache_release(page); | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, | |
1163 | loff_t length) | |
1164 | { | |
1165 | loff_t nearly = round_up(offset, PAGE_CACHE_SIZE); | |
1166 | if (offset < nearly) { | |
1167 | loff_t size = nearly - offset; | |
1168 | if (length < size) | |
1169 | size = length; | |
1170 | ceph_zero_partial_page(inode, offset, size); | |
1171 | offset += size; | |
1172 | length -= size; | |
1173 | } | |
1174 | if (length >= PAGE_CACHE_SIZE) { | |
1175 | loff_t size = round_down(length, PAGE_CACHE_SIZE); | |
1176 | truncate_pagecache_range(inode, offset, offset + size - 1); | |
1177 | offset += size; | |
1178 | length -= size; | |
1179 | } | |
1180 | if (length) | |
1181 | ceph_zero_partial_page(inode, offset, length); | |
1182 | } | |
1183 | ||
1184 | static int ceph_zero_partial_object(struct inode *inode, | |
1185 | loff_t offset, loff_t *length) | |
1186 | { | |
1187 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1188 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1189 | struct ceph_osd_request *req; | |
1190 | int ret = 0; | |
1191 | loff_t zero = 0; | |
1192 | int op; | |
1193 | ||
1194 | if (!length) { | |
1195 | op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; | |
1196 | length = &zero; | |
1197 | } else { | |
1198 | op = CEPH_OSD_OP_ZERO; | |
1199 | } | |
1200 | ||
1201 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1202 | ceph_vino(inode), | |
1203 | offset, length, | |
715e4cd4 | 1204 | 0, 1, op, |
ad7a60de LW |
1205 | CEPH_OSD_FLAG_WRITE | |
1206 | CEPH_OSD_FLAG_ONDISK, | |
1207 | NULL, 0, 0, false); | |
1208 | if (IS_ERR(req)) { | |
1209 | ret = PTR_ERR(req); | |
1210 | goto out; | |
1211 | } | |
1212 | ||
1213 | ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap, | |
1214 | &inode->i_mtime); | |
1215 | ||
1216 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); | |
1217 | if (!ret) { | |
1218 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1219 | if (ret == -ENOENT) | |
1220 | ret = 0; | |
1221 | } | |
1222 | ceph_osdc_put_request(req); | |
1223 | ||
1224 | out: | |
1225 | return ret; | |
1226 | } | |
1227 | ||
1228 | static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) | |
1229 | { | |
1230 | int ret = 0; | |
1231 | struct ceph_inode_info *ci = ceph_inode(inode); | |
b314a90d SW |
1232 | s32 stripe_unit = ceph_file_layout_su(ci->i_layout); |
1233 | s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); | |
1234 | s32 object_size = ceph_file_layout_object_size(ci->i_layout); | |
1235 | u64 object_set_size = object_size * stripe_count; | |
1236 | u64 nearly, t; | |
1237 | ||
1238 | /* round offset up to next period boundary */ | |
1239 | nearly = offset + object_set_size - 1; | |
1240 | t = nearly; | |
1241 | nearly -= do_div(t, object_set_size); | |
ad7a60de | 1242 | |
ad7a60de LW |
1243 | while (length && offset < nearly) { |
1244 | loff_t size = length; | |
1245 | ret = ceph_zero_partial_object(inode, offset, &size); | |
1246 | if (ret < 0) | |
1247 | return ret; | |
1248 | offset += size; | |
1249 | length -= size; | |
1250 | } | |
1251 | while (length >= object_set_size) { | |
1252 | int i; | |
1253 | loff_t pos = offset; | |
1254 | for (i = 0; i < stripe_count; ++i) { | |
1255 | ret = ceph_zero_partial_object(inode, pos, NULL); | |
1256 | if (ret < 0) | |
1257 | return ret; | |
1258 | pos += stripe_unit; | |
1259 | } | |
1260 | offset += object_set_size; | |
1261 | length -= object_set_size; | |
1262 | } | |
1263 | while (length) { | |
1264 | loff_t size = length; | |
1265 | ret = ceph_zero_partial_object(inode, offset, &size); | |
1266 | if (ret < 0) | |
1267 | return ret; | |
1268 | offset += size; | |
1269 | length -= size; | |
1270 | } | |
1271 | return ret; | |
1272 | } | |
1273 | ||
1274 | static long ceph_fallocate(struct file *file, int mode, | |
1275 | loff_t offset, loff_t length) | |
1276 | { | |
1277 | struct ceph_file_info *fi = file->private_data; | |
aa8b60e0 | 1278 | struct inode *inode = file_inode(file); |
ad7a60de LW |
1279 | struct ceph_inode_info *ci = ceph_inode(inode); |
1280 | struct ceph_osd_client *osdc = | |
1281 | &ceph_inode_to_client(inode)->client->osdc; | |
f66fd9f0 | 1282 | struct ceph_cap_flush *prealloc_cf; |
ad7a60de LW |
1283 | int want, got = 0; |
1284 | int dirty; | |
1285 | int ret = 0; | |
1286 | loff_t endoff = 0; | |
1287 | loff_t size; | |
1288 | ||
494d77bf YZ |
1289 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
1290 | return -EOPNOTSUPP; | |
1291 | ||
ad7a60de LW |
1292 | if (!S_ISREG(inode->i_mode)) |
1293 | return -EOPNOTSUPP; | |
1294 | ||
f66fd9f0 YZ |
1295 | prealloc_cf = ceph_alloc_cap_flush(); |
1296 | if (!prealloc_cf) | |
1297 | return -ENOMEM; | |
1298 | ||
ad7a60de LW |
1299 | mutex_lock(&inode->i_mutex); |
1300 | ||
1301 | if (ceph_snap(inode) != CEPH_NOSNAP) { | |
1302 | ret = -EROFS; | |
1303 | goto unlock; | |
1304 | } | |
1305 | ||
1306 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) && | |
1307 | !(mode & FALLOC_FL_PUNCH_HOLE)) { | |
1308 | ret = -ENOSPC; | |
1309 | goto unlock; | |
1310 | } | |
1311 | ||
28127bdd YZ |
1312 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1313 | ret = ceph_uninline_data(file, NULL); | |
1314 | if (ret < 0) | |
1315 | goto unlock; | |
1316 | } | |
1317 | ||
ad7a60de LW |
1318 | size = i_size_read(inode); |
1319 | if (!(mode & FALLOC_FL_KEEP_SIZE)) | |
1320 | endoff = offset + length; | |
1321 | ||
1322 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1323 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1324 | else | |
1325 | want = CEPH_CAP_FILE_BUFFER; | |
1326 | ||
3738daa6 | 1327 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL); |
ad7a60de LW |
1328 | if (ret < 0) |
1329 | goto unlock; | |
1330 | ||
1331 | if (mode & FALLOC_FL_PUNCH_HOLE) { | |
1332 | if (offset < size) | |
1333 | ceph_zero_pagecache_range(inode, offset, length); | |
1334 | ret = ceph_zero_objects(inode, offset, length); | |
1335 | } else if (endoff > size) { | |
1336 | truncate_pagecache_range(inode, size, -1); | |
1337 | if (ceph_inode_set_size(inode, endoff)) | |
1338 | ceph_check_caps(ceph_inode(inode), | |
1339 | CHECK_CAPS_AUTHONLY, NULL); | |
1340 | } | |
1341 | ||
1342 | if (!ret) { | |
1343 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1344 | ci->i_inline_version = CEPH_INLINE_NONE; |
f66fd9f0 YZ |
1345 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, |
1346 | &prealloc_cf); | |
ad7a60de LW |
1347 | spin_unlock(&ci->i_ceph_lock); |
1348 | if (dirty) | |
1349 | __mark_inode_dirty(inode, dirty); | |
1350 | } | |
1351 | ||
1352 | ceph_put_cap_refs(ci, got); | |
1353 | unlock: | |
1354 | mutex_unlock(&inode->i_mutex); | |
f66fd9f0 | 1355 | ceph_free_cap_flush(prealloc_cf); |
ad7a60de LW |
1356 | return ret; |
1357 | } | |
1358 | ||
124e68e7 SW |
1359 | const struct file_operations ceph_file_fops = { |
1360 | .open = ceph_open, | |
1361 | .release = ceph_release, | |
1362 | .llseek = ceph_llseek, | |
3644424d | 1363 | .read_iter = ceph_read_iter, |
4908b822 | 1364 | .write_iter = ceph_write_iter, |
124e68e7 SW |
1365 | .mmap = ceph_mmap, |
1366 | .fsync = ceph_fsync, | |
40819f6f GF |
1367 | .lock = ceph_lock, |
1368 | .flock = ceph_flock, | |
124e68e7 | 1369 | .splice_read = generic_file_splice_read, |
3551dd79 | 1370 | .splice_write = iter_file_splice_write, |
124e68e7 SW |
1371 | .unlocked_ioctl = ceph_ioctl, |
1372 | .compat_ioctl = ceph_ioctl, | |
ad7a60de | 1373 | .fallocate = ceph_fallocate, |
124e68e7 SW |
1374 | }; |
1375 |