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; |
752c8bdc | 213 | if (flags & O_CREAT) |
b583043e | 214 | parent_inode = ceph_get_dentry_parent_inode(file->f_path.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; |
b1ee94aa | 238 | struct ceph_acls_info acls = {}; |
124e68e7 | 239 | int err; |
124e68e7 | 240 | |
a455589f AV |
241 | dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n", |
242 | dir, dentry, dentry, | |
5ef50c3b SW |
243 | d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode); |
244 | ||
245 | if (dentry->d_name.len > NAME_MAX) | |
246 | return -ENAMETOOLONG; | |
247 | ||
248 | err = ceph_init_dentry(dentry); | |
249 | if (err < 0) | |
250 | return err; | |
124e68e7 | 251 | |
b1ee94aa YZ |
252 | if (flags & O_CREAT) { |
253 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
254 | if (err < 0) | |
255 | return err; | |
256 | } | |
257 | ||
124e68e7 SW |
258 | /* do the open */ |
259 | req = prepare_open_request(dir->i_sb, flags, mode); | |
b1ee94aa YZ |
260 | if (IS_ERR(req)) { |
261 | err = PTR_ERR(req); | |
262 | goto out_acl; | |
263 | } | |
124e68e7 SW |
264 | req->r_dentry = dget(dentry); |
265 | req->r_num_caps = 2; | |
266 | if (flags & O_CREAT) { | |
267 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
268 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
269 | if (acls.pagelist) { |
270 | req->r_pagelist = acls.pagelist; | |
271 | acls.pagelist = NULL; | |
272 | } | |
124e68e7 SW |
273 | } |
274 | req->r_locked_dir = dir; /* caller holds dir->i_mutex */ | |
acda7657 SW |
275 | err = ceph_mdsc_do_request(mdsc, |
276 | (flags & (O_CREAT|O_TRUNC)) ? dir : NULL, | |
277 | req); | |
bf91c315 | 278 | err = ceph_handle_snapdir(req, dentry, err); |
79aec984 | 279 | if (err) |
b1ee94aa | 280 | goto out_req; |
79aec984 | 281 | |
5ef50c3b | 282 | if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry) |
124e68e7 | 283 | err = ceph_handle_notrace_create(dir, dentry); |
2d83bde9 | 284 | |
5ef50c3b SW |
285 | if (d_unhashed(dentry)) { |
286 | dn = ceph_finish_lookup(req, dentry, err); | |
287 | if (IS_ERR(dn)) | |
288 | err = PTR_ERR(dn); | |
289 | } else { | |
290 | /* we were given a hashed negative dentry */ | |
291 | dn = NULL; | |
292 | } | |
293 | if (err) | |
b1ee94aa | 294 | goto out_req; |
5ef50c3b SW |
295 | if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) { |
296 | /* make vfs retry on splice, ENOENT, or symlink */ | |
297 | dout("atomic_open finish_no_open on dn %p\n", dn); | |
298 | err = finish_no_open(file, dn); | |
299 | } else { | |
300 | dout("atomic_open finish_open on dn %p\n", dn); | |
6e8575fa | 301 | if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) { |
b1ee94aa | 302 | ceph_init_inode_acls(dentry->d_inode, &acls); |
6e8575fa SL |
303 | *opened |= FILE_CREATED; |
304 | } | |
5ef50c3b SW |
305 | err = finish_open(file, dentry, ceph_open, opened); |
306 | } | |
b1ee94aa | 307 | out_req: |
ab866549 YZ |
308 | if (!req->r_err && req->r_target_inode) |
309 | ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode); | |
5ef50c3b | 310 | ceph_mdsc_put_request(req); |
b1ee94aa YZ |
311 | out_acl: |
312 | ceph_release_acls_info(&acls); | |
5ef50c3b | 313 | dout("atomic_open result=%d\n", err); |
d9585277 | 314 | return err; |
124e68e7 SW |
315 | } |
316 | ||
317 | int ceph_release(struct inode *inode, struct file *file) | |
318 | { | |
319 | struct ceph_inode_info *ci = ceph_inode(inode); | |
320 | struct ceph_file_info *cf = file->private_data; | |
321 | ||
322 | dout("release inode %p file %p\n", inode, file); | |
323 | ceph_put_fmode(ci, cf->fmode); | |
324 | if (cf->last_readdir) | |
325 | ceph_mdsc_put_request(cf->last_readdir); | |
326 | kfree(cf->last_name); | |
327 | kfree(cf->dir_info); | |
328 | dput(cf->dentry); | |
329 | kmem_cache_free(ceph_file_cachep, cf); | |
195d3ce2 SW |
330 | |
331 | /* wake up anyone waiting for caps on this inode */ | |
03066f23 | 332 | wake_up_all(&ci->i_cap_wq); |
124e68e7 SW |
333 | return 0; |
334 | } | |
335 | ||
83701246 YZ |
336 | enum { |
337 | CHECK_EOF = 1, | |
338 | READ_INLINE = 2, | |
339 | }; | |
340 | ||
124e68e7 SW |
341 | /* |
342 | * Read a range of bytes striped over one or more objects. Iterate over | |
343 | * objects we stripe over. (That's not atomic, but good enough for now.) | |
344 | * | |
345 | * If we get a short result from the OSD, check against i_size; we need to | |
346 | * only return a short read to the caller if we hit EOF. | |
347 | */ | |
348 | static int striped_read(struct inode *inode, | |
349 | u64 off, u64 len, | |
6a026589 | 350 | struct page **pages, int num_pages, |
c3cd6283 | 351 | int *checkeof, bool o_direct, |
ab226e21 | 352 | unsigned long buf_align) |
124e68e7 | 353 | { |
3d14c5d2 | 354 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
124e68e7 | 355 | struct ceph_inode_info *ci = ceph_inode(inode); |
688bac46 | 356 | u64 pos, this_len, left; |
b7495fc2 | 357 | int io_align, page_align; |
688bac46 | 358 | int pages_left; |
124e68e7 SW |
359 | int read; |
360 | struct page **page_pos; | |
361 | int ret; | |
362 | bool hit_stripe, was_short; | |
363 | ||
364 | /* | |
365 | * we may need to do multiple reads. not atomic, unfortunately. | |
366 | */ | |
367 | pos = off; | |
368 | left = len; | |
369 | page_pos = pages; | |
370 | pages_left = num_pages; | |
371 | read = 0; | |
b7495fc2 | 372 | io_align = off & ~PAGE_MASK; |
124e68e7 SW |
373 | |
374 | more: | |
c3cd6283 | 375 | if (o_direct) |
ab226e21 | 376 | page_align = (pos - io_align + buf_align) & ~PAGE_MASK; |
b7495fc2 SW |
377 | else |
378 | page_align = pos & ~PAGE_MASK; | |
124e68e7 | 379 | this_len = left; |
3d14c5d2 | 380 | ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode), |
124e68e7 SW |
381 | &ci->i_layout, pos, &this_len, |
382 | ci->i_truncate_seq, | |
383 | ci->i_truncate_size, | |
b7495fc2 | 384 | page_pos, pages_left, page_align); |
124e68e7 SW |
385 | if (ret == -ENOENT) |
386 | ret = 0; | |
0e98728f SW |
387 | hit_stripe = this_len < left; |
388 | was_short = ret >= 0 && ret < this_len; | |
688bac46 | 389 | dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read, |
124e68e7 SW |
390 | ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : ""); |
391 | ||
02ae66d8 | 392 | if (ret >= 0) { |
393 | int didpages; | |
394 | if (was_short && (pos + ret < inode->i_size)) { | |
1487a688 YZ |
395 | int zlen = min(this_len - ret, |
396 | inode->i_size - pos - ret); | |
397 | int zoff = (o_direct ? buf_align : io_align) + | |
398 | read + ret; | |
02ae66d8 | 399 | dout(" zero gap %llu to %llu\n", |
1487a688 YZ |
400 | pos + ret, pos + ret + zlen); |
401 | ceph_zero_page_vector_range(zoff, zlen, pages); | |
402 | ret += zlen; | |
124e68e7 | 403 | } |
02ae66d8 | 404 | |
405 | didpages = (page_align + ret) >> PAGE_CACHE_SHIFT; | |
124e68e7 SW |
406 | pos += ret; |
407 | read = pos - off; | |
408 | left -= ret; | |
409 | page_pos += didpages; | |
410 | pages_left -= didpages; | |
411 | ||
02ae66d8 | 412 | /* hit stripe and need continue*/ |
413 | if (left && hit_stripe && pos < inode->i_size) | |
124e68e7 SW |
414 | goto more; |
415 | } | |
416 | ||
ee7289bf | 417 | if (read > 0) { |
02ae66d8 | 418 | ret = read; |
c3cd6283 SW |
419 | /* did we bounce off eof? */ |
420 | if (pos + left > inode->i_size) | |
83701246 | 421 | *checkeof = CHECK_EOF; |
124e68e7 SW |
422 | } |
423 | ||
124e68e7 SW |
424 | dout("striped_read returns %d\n", ret); |
425 | return ret; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Completely synchronous read and write methods. Direct from __user | |
430 | * buffer to osd, or directly to user pages (if O_DIRECT). | |
431 | * | |
432 | * If the read spans object boundary, just do multiple reads. | |
433 | */ | |
8eb4efb0 | 434 | static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i, |
435 | int *checkeof) | |
124e68e7 | 436 | { |
8eb4efb0 | 437 | struct file *file = iocb->ki_filp; |
496ad9aa | 438 | struct inode *inode = file_inode(file); |
124e68e7 | 439 | struct page **pages; |
8eb4efb0 | 440 | u64 off = iocb->ki_pos; |
ab226e21 | 441 | int num_pages, ret; |
2b777c9d | 442 | size_t len = iov_iter_count(i); |
124e68e7 | 443 | |
8eb4efb0 | 444 | dout("sync_read on file %p %llu~%u %s\n", file, off, |
445 | (unsigned)len, | |
124e68e7 | 446 | (file->f_flags & O_DIRECT) ? "O_DIRECT" : ""); |
d0d0db22 YZ |
447 | |
448 | if (!len) | |
449 | return 0; | |
e98b6fed SW |
450 | /* |
451 | * flush any page cache pages in this range. this | |
452 | * will make concurrent normal and sync io slow, | |
453 | * but it will at least behave sensibly when they are | |
454 | * in sequence. | |
455 | */ | |
8eb4efb0 | 456 | ret = filemap_write_and_wait_range(inode->i_mapping, off, |
457 | off + len); | |
29065a51 | 458 | if (ret < 0) |
8eb4efb0 | 459 | return ret; |
29065a51 | 460 | |
8eb4efb0 | 461 | if (file->f_flags & O_DIRECT) { |
462 | while (iov_iter_count(i)) { | |
2b777c9d AV |
463 | size_t start; |
464 | ssize_t n; | |
8eb4efb0 | 465 | |
2b777c9d AV |
466 | n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start); |
467 | if (n < 0) | |
468 | return n; | |
8eb4efb0 | 469 | |
2b777c9d AV |
470 | num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; |
471 | ||
472 | ret = striped_read(inode, off, n, | |
8eb4efb0 | 473 | pages, num_pages, checkeof, |
2b777c9d AV |
474 | 1, start); |
475 | ||
8eb4efb0 | 476 | ceph_put_page_vector(pages, num_pages, true); |
477 | ||
478 | if (ret <= 0) | |
479 | break; | |
480 | off += ret; | |
481 | iov_iter_advance(i, ret); | |
2b777c9d | 482 | if (ret < n) |
8eb4efb0 | 483 | break; |
484 | } | |
485 | } else { | |
486 | num_pages = calc_pages_for(off, len); | |
487 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); | |
488 | if (IS_ERR(pages)) | |
489 | return PTR_ERR(pages); | |
490 | ret = striped_read(inode, off, len, pages, | |
491 | num_pages, checkeof, 0, 0); | |
492 | if (ret > 0) { | |
493 | int l, k = 0; | |
2b777c9d | 494 | size_t left = ret; |
8eb4efb0 | 495 | |
496 | while (left) { | |
5aaa432a YZ |
497 | size_t page_off = off & ~PAGE_MASK; |
498 | size_t copy = min_t(size_t, | |
499 | PAGE_SIZE - page_off, left); | |
500 | l = copy_page_to_iter(pages[k++], page_off, | |
501 | copy, i); | |
2b777c9d AV |
502 | off += l; |
503 | left -= l; | |
504 | if (l < copy) | |
8eb4efb0 | 505 | break; |
506 | } | |
507 | } | |
508 | ceph_release_page_vector(pages, num_pages); | |
509 | } | |
124e68e7 | 510 | |
8eb4efb0 | 511 | if (off > iocb->ki_pos) { |
512 | ret = off - iocb->ki_pos; | |
513 | iocb->ki_pos = off; | |
514 | } | |
124e68e7 | 515 | |
124e68e7 SW |
516 | dout("sync_read result %d\n", ret); |
517 | return ret; | |
518 | } | |
519 | ||
520 | /* | |
26be8808 AE |
521 | * Write commit request unsafe callback, called to tell us when a |
522 | * request is unsafe (that is, in flight--has been handed to the | |
523 | * messenger to send to its target osd). It is called again when | |
524 | * we've received a response message indicating the request is | |
525 | * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request | |
526 | * is completed early (and unsuccessfully) due to a timeout or | |
527 | * interrupt. | |
528 | * | |
529 | * This is used if we requested both an ACK and ONDISK commit reply | |
530 | * from the OSD. | |
124e68e7 | 531 | */ |
26be8808 | 532 | static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe) |
124e68e7 SW |
533 | { |
534 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
535 | ||
26be8808 AE |
536 | dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid, |
537 | unsafe ? "un" : ""); | |
538 | if (unsafe) { | |
539 | ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR); | |
540 | spin_lock(&ci->i_unsafe_lock); | |
541 | list_add_tail(&req->r_unsafe_item, | |
542 | &ci->i_unsafe_writes); | |
543 | spin_unlock(&ci->i_unsafe_lock); | |
544 | } else { | |
545 | spin_lock(&ci->i_unsafe_lock); | |
546 | list_del_init(&req->r_unsafe_item); | |
547 | spin_unlock(&ci->i_unsafe_lock); | |
548 | ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR); | |
549 | } | |
124e68e7 SW |
550 | } |
551 | ||
e8344e66 | 552 | |
124e68e7 | 553 | /* |
e8344e66 | 554 | * Synchronous write, straight from __user pointer or user pages. |
124e68e7 SW |
555 | * |
556 | * If write spans object boundary, just do multiple writes. (For a | |
557 | * correct atomic write, we should e.g. take write locks on all | |
558 | * objects, rollback on failure, etc.) | |
559 | */ | |
e8344e66 | 560 | static ssize_t |
06fee30f | 561 | ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos) |
124e68e7 | 562 | { |
e8344e66 | 563 | struct file *file = iocb->ki_filp; |
496ad9aa | 564 | struct inode *inode = file_inode(file); |
124e68e7 | 565 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 | 566 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
acead002 AE |
567 | struct ceph_snap_context *snapc; |
568 | struct ceph_vino vino; | |
124e68e7 SW |
569 | struct ceph_osd_request *req; |
570 | struct page **pages; | |
571 | int num_pages; | |
124e68e7 SW |
572 | int written = 0; |
573 | int flags; | |
124e68e7 SW |
574 | int check_caps = 0; |
575 | int ret; | |
576 | struct timespec mtime = CURRENT_TIME; | |
4908b822 | 577 | size_t count = iov_iter_count(from); |
124e68e7 | 578 | |
496ad9aa | 579 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) |
124e68e7 SW |
580 | return -EROFS; |
581 | ||
e8344e66 | 582 | dout("sync_direct_write on file %p %lld~%u\n", file, pos, |
583 | (unsigned)count); | |
124e68e7 | 584 | |
e8344e66 | 585 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); |
29065a51 YS |
586 | if (ret < 0) |
587 | return ret; | |
588 | ||
589 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
590 | pos >> PAGE_CACHE_SHIFT, | |
e8344e66 | 591 | (pos + count) >> PAGE_CACHE_SHIFT); |
29065a51 YS |
592 | if (ret < 0) |
593 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
594 | ||
124e68e7 SW |
595 | flags = CEPH_OSD_FLAG_ORDERSNAP | |
596 | CEPH_OSD_FLAG_ONDISK | | |
597 | CEPH_OSD_FLAG_WRITE; | |
124e68e7 | 598 | |
4908b822 AV |
599 | while (iov_iter_count(from) > 0) { |
600 | u64 len = iov_iter_single_seg_count(from); | |
64c31311 AV |
601 | size_t start; |
602 | ssize_t n; | |
e8344e66 | 603 | |
604 | snapc = ci->i_snap_realm->cached_context; | |
605 | vino = ceph_vino(inode); | |
606 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
715e4cd4 | 607 | vino, pos, &len, 0, |
e8344e66 | 608 | 2,/*include a 'startsync' command*/ |
609 | CEPH_OSD_OP_WRITE, flags, snapc, | |
610 | ci->i_truncate_seq, | |
611 | ci->i_truncate_size, | |
612 | false); | |
613 | if (IS_ERR(req)) { | |
614 | ret = PTR_ERR(req); | |
eab87235 | 615 | break; |
e8344e66 | 616 | } |
124e68e7 | 617 | |
715e4cd4 YZ |
618 | osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC); |
619 | ||
4908b822 | 620 | n = iov_iter_get_pages_alloc(from, &pages, len, &start); |
64c31311 AV |
621 | if (unlikely(n < 0)) { |
622 | ret = n; | |
623 | ceph_osdc_put_request(req); | |
624 | break; | |
124e68e7 SW |
625 | } |
626 | ||
64c31311 | 627 | num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE; |
124e68e7 SW |
628 | /* |
629 | * throw out any page cache pages in this range. this | |
630 | * may block. | |
631 | */ | |
213c99ee | 632 | truncate_inode_pages_range(inode->i_mapping, pos, |
64c31311 AV |
633 | (pos+n) | (PAGE_CACHE_SIZE-1)); |
634 | osd_req_op_extent_osd_data_pages(req, 0, pages, n, start, | |
e8344e66 | 635 | false, false); |
636 | ||
637 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ | |
638 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); | |
639 | ||
640 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); | |
641 | if (!ret) | |
642 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
643 | ||
644 | ceph_put_page_vector(pages, num_pages, false); | |
645 | ||
e8344e66 | 646 | ceph_osdc_put_request(req); |
64c31311 | 647 | if (ret) |
e8344e66 | 648 | break; |
64c31311 AV |
649 | pos += n; |
650 | written += n; | |
4908b822 | 651 | iov_iter_advance(from, n); |
64c31311 AV |
652 | |
653 | if (pos > i_size_read(inode)) { | |
654 | check_caps = ceph_inode_set_size(inode, pos); | |
655 | if (check_caps) | |
656 | ceph_check_caps(ceph_inode(inode), | |
657 | CHECK_CAPS_AUTHONLY, | |
658 | NULL); | |
659 | } | |
e8344e66 | 660 | } |
661 | ||
662 | if (ret != -EOLDSNAPC && written > 0) { | |
663 | iocb->ki_pos = pos; | |
664 | ret = written; | |
665 | } | |
666 | return ret; | |
667 | } | |
668 | ||
669 | ||
670 | /* | |
671 | * Synchronous write, straight from __user pointer or user pages. | |
672 | * | |
673 | * If write spans object boundary, just do multiple writes. (For a | |
674 | * correct atomic write, we should e.g. take write locks on all | |
675 | * objects, rollback on failure, etc.) | |
676 | */ | |
06fee30f YZ |
677 | static ssize_t |
678 | ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos) | |
e8344e66 | 679 | { |
680 | struct file *file = iocb->ki_filp; | |
681 | struct inode *inode = file_inode(file); | |
682 | struct ceph_inode_info *ci = ceph_inode(inode); | |
683 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
684 | struct ceph_snap_context *snapc; | |
685 | struct ceph_vino vino; | |
686 | struct ceph_osd_request *req; | |
687 | struct page **pages; | |
688 | u64 len; | |
689 | int num_pages; | |
690 | int written = 0; | |
691 | int flags; | |
692 | int check_caps = 0; | |
693 | int ret; | |
694 | struct timespec mtime = CURRENT_TIME; | |
4908b822 | 695 | size_t count = iov_iter_count(from); |
e8344e66 | 696 | |
697 | if (ceph_snap(file_inode(file)) != CEPH_NOSNAP) | |
698 | return -EROFS; | |
699 | ||
700 | dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count); | |
701 | ||
702 | ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count); | |
703 | if (ret < 0) | |
704 | return ret; | |
705 | ||
706 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
707 | pos >> PAGE_CACHE_SHIFT, | |
708 | (pos + count) >> PAGE_CACHE_SHIFT); | |
709 | if (ret < 0) | |
710 | dout("invalidate_inode_pages2_range returned %d\n", ret); | |
711 | ||
712 | flags = CEPH_OSD_FLAG_ORDERSNAP | | |
713 | CEPH_OSD_FLAG_ONDISK | | |
714 | CEPH_OSD_FLAG_WRITE | | |
715 | CEPH_OSD_FLAG_ACK; | |
716 | ||
4908b822 | 717 | while ((len = iov_iter_count(from)) > 0) { |
e8344e66 | 718 | size_t left; |
719 | int n; | |
720 | ||
721 | snapc = ci->i_snap_realm->cached_context; | |
722 | vino = ceph_vino(inode); | |
723 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
715e4cd4 | 724 | vino, pos, &len, 0, 1, |
e8344e66 | 725 | CEPH_OSD_OP_WRITE, flags, snapc, |
726 | ci->i_truncate_seq, | |
727 | ci->i_truncate_size, | |
728 | false); | |
729 | if (IS_ERR(req)) { | |
730 | ret = PTR_ERR(req); | |
eab87235 | 731 | break; |
e8344e66 | 732 | } |
733 | ||
734 | /* | |
735 | * write from beginning of first page, | |
736 | * regardless of io alignment | |
737 | */ | |
738 | num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
739 | ||
34d23762 | 740 | pages = ceph_alloc_page_vector(num_pages, GFP_NOFS); |
124e68e7 SW |
741 | if (IS_ERR(pages)) { |
742 | ret = PTR_ERR(pages); | |
743 | goto out; | |
744 | } | |
e8344e66 | 745 | |
746 | left = len; | |
747 | for (n = 0; n < num_pages; n++) { | |
125d725c | 748 | size_t plen = min_t(size_t, left, PAGE_SIZE); |
4908b822 | 749 | ret = copy_page_from_iter(pages[n], 0, plen, from); |
e8344e66 | 750 | if (ret != plen) { |
751 | ret = -EFAULT; | |
752 | break; | |
753 | } | |
754 | left -= ret; | |
e8344e66 | 755 | } |
756 | ||
124e68e7 SW |
757 | if (ret < 0) { |
758 | ceph_release_page_vector(pages, num_pages); | |
759 | goto out; | |
760 | } | |
761 | ||
e8344e66 | 762 | /* get a second commit callback */ |
763 | req->r_unsafe_callback = ceph_sync_write_unsafe; | |
764 | req->r_inode = inode; | |
124e68e7 | 765 | |
e8344e66 | 766 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, |
767 | false, true); | |
02ee07d3 | 768 | |
e8344e66 | 769 | /* BUG_ON(vino.snap != CEPH_NOSNAP); */ |
770 | ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime); | |
124e68e7 | 771 | |
e8344e66 | 772 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
773 | if (!ret) | |
774 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
124e68e7 SW |
775 | |
776 | out: | |
e8344e66 | 777 | ceph_osdc_put_request(req); |
778 | if (ret == 0) { | |
779 | pos += len; | |
780 | written += len; | |
781 | ||
782 | if (pos > i_size_read(inode)) { | |
783 | check_caps = ceph_inode_set_size(inode, pos); | |
784 | if (check_caps) | |
785 | ceph_check_caps(ceph_inode(inode), | |
786 | CHECK_CAPS_AUTHONLY, | |
787 | NULL); | |
788 | } | |
789 | } else | |
790 | break; | |
791 | } | |
124e68e7 | 792 | |
e8344e66 | 793 | if (ret != -EOLDSNAPC && written > 0) { |
124e68e7 | 794 | ret = written; |
e8344e66 | 795 | iocb->ki_pos = pos; |
124e68e7 SW |
796 | } |
797 | return ret; | |
798 | } | |
799 | ||
800 | /* | |
801 | * Wrap generic_file_aio_read with checks for cap bits on the inode. | |
802 | * Atomically grab references, so that those bits are not released | |
803 | * back to the MDS mid-read. | |
804 | * | |
805 | * Hmm, the sync read case isn't actually async... should it be? | |
806 | */ | |
3644424d | 807 | static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to) |
124e68e7 SW |
808 | { |
809 | struct file *filp = iocb->ki_filp; | |
2962507c | 810 | struct ceph_file_info *fi = filp->private_data; |
8eb4efb0 | 811 | size_t len = iocb->ki_nbytes; |
496ad9aa | 812 | struct inode *inode = file_inode(filp); |
124e68e7 | 813 | struct ceph_inode_info *ci = ceph_inode(inode); |
3738daa6 | 814 | struct page *pinned_page = NULL; |
124e68e7 | 815 | ssize_t ret; |
2962507c | 816 | int want, got = 0; |
83701246 | 817 | int retry_op = 0, read = 0; |
124e68e7 | 818 | |
6a026589 | 819 | again: |
8eb4efb0 | 820 | dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n", |
821 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode); | |
822 | ||
2962507c SW |
823 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
824 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; | |
825 | else | |
826 | want = CEPH_CAP_FILE_CACHE; | |
3738daa6 | 827 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); |
124e68e7 | 828 | if (ret < 0) |
8eb4efb0 | 829 | return ret; |
124e68e7 | 830 | |
2962507c | 831 | if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 || |
124e68e7 | 832 | (iocb->ki_filp->f_flags & O_DIRECT) || |
8eb4efb0 | 833 | (fi->flags & CEPH_F_SYNC)) { |
8eb4efb0 | 834 | |
835 | dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n", | |
836 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, | |
837 | ceph_cap_string(got)); | |
838 | ||
83701246 YZ |
839 | if (ci->i_inline_version == CEPH_INLINE_NONE) { |
840 | /* hmm, this isn't really async... */ | |
841 | ret = ceph_sync_read(iocb, to, &retry_op); | |
842 | } else { | |
843 | retry_op = READ_INLINE; | |
844 | } | |
8eb4efb0 | 845 | } else { |
8eb4efb0 | 846 | dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n", |
3644424d | 847 | inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, |
8eb4efb0 | 848 | ceph_cap_string(got)); |
124e68e7 | 849 | |
3644424d | 850 | ret = generic_file_read_iter(iocb, to); |
8eb4efb0 | 851 | } |
124e68e7 SW |
852 | dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n", |
853 | inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret); | |
3738daa6 YZ |
854 | if (pinned_page) { |
855 | page_cache_release(pinned_page); | |
856 | pinned_page = NULL; | |
857 | } | |
124e68e7 | 858 | ceph_put_cap_refs(ci, got); |
83701246 YZ |
859 | if (retry_op && ret >= 0) { |
860 | int statret; | |
861 | struct page *page = NULL; | |
862 | loff_t i_size; | |
863 | if (retry_op == READ_INLINE) { | |
864 | page = __page_cache_alloc(GFP_NOFS); | |
865 | if (!page) | |
866 | return -ENOMEM; | |
867 | } | |
6a026589 | 868 | |
83701246 YZ |
869 | statret = __ceph_do_getattr(inode, page, |
870 | CEPH_STAT_CAP_INLINE_DATA, !!page); | |
871 | if (statret < 0) { | |
872 | __free_page(page); | |
873 | if (statret == -ENODATA) { | |
874 | BUG_ON(retry_op != READ_INLINE); | |
875 | goto again; | |
876 | } | |
877 | return statret; | |
878 | } | |
6a026589 | 879 | |
83701246 YZ |
880 | i_size = i_size_read(inode); |
881 | if (retry_op == READ_INLINE) { | |
fcc02d2a YZ |
882 | BUG_ON(ret > 0 || read > 0); |
883 | if (iocb->ki_pos < i_size && | |
884 | iocb->ki_pos < PAGE_CACHE_SIZE) { | |
83701246 YZ |
885 | loff_t end = min_t(loff_t, i_size, |
886 | iocb->ki_pos + len); | |
fcc02d2a | 887 | end = min_t(loff_t, end, PAGE_CACHE_SIZE); |
83701246 YZ |
888 | if (statret < end) |
889 | zero_user_segment(page, statret, end); | |
890 | ret = copy_page_to_iter(page, | |
891 | iocb->ki_pos & ~PAGE_MASK, | |
892 | end - iocb->ki_pos, to); | |
893 | iocb->ki_pos += ret; | |
fcc02d2a YZ |
894 | read += ret; |
895 | } | |
896 | if (iocb->ki_pos < i_size && read < len) { | |
897 | size_t zlen = min_t(size_t, len - read, | |
898 | i_size - iocb->ki_pos); | |
899 | ret = iov_iter_zero(zlen, to); | |
900 | iocb->ki_pos += ret; | |
901 | read += ret; | |
83701246 YZ |
902 | } |
903 | __free_pages(page, 0); | |
fcc02d2a | 904 | return read; |
83701246 | 905 | } |
6a026589 SW |
906 | |
907 | /* hit EOF or hole? */ | |
83701246 | 908 | if (retry_op == CHECK_EOF && iocb->ki_pos < i_size && |
fcc02d2a | 909 | ret < len) { |
8eb4efb0 | 910 | dout("sync_read hit hole, ppos %lld < size %lld" |
911 | ", reading more\n", iocb->ki_pos, | |
912 | inode->i_size); | |
913 | ||
6a026589 | 914 | read += ret; |
6a026589 | 915 | len -= ret; |
83701246 | 916 | retry_op = 0; |
6a026589 SW |
917 | goto again; |
918 | } | |
919 | } | |
8eb4efb0 | 920 | |
6a026589 SW |
921 | if (ret >= 0) |
922 | ret += read; | |
923 | ||
124e68e7 SW |
924 | return ret; |
925 | } | |
926 | ||
927 | /* | |
928 | * Take cap references to avoid releasing caps to MDS mid-write. | |
929 | * | |
930 | * If we are synchronous, and write with an old snap context, the OSD | |
931 | * may return EOLDSNAPC. In that case, retry the write.. _after_ | |
932 | * dropping our cap refs and allowing the pending snap to logically | |
933 | * complete _before_ this write occurs. | |
934 | * | |
935 | * If we are near ENOSPC, write synchronously. | |
936 | */ | |
4908b822 | 937 | static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) |
124e68e7 SW |
938 | { |
939 | struct file *file = iocb->ki_filp; | |
33caad32 | 940 | struct ceph_file_info *fi = file->private_data; |
496ad9aa | 941 | struct inode *inode = file_inode(file); |
124e68e7 | 942 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
943 | struct ceph_osd_client *osdc = |
944 | &ceph_sb_to_client(inode->i_sb)->client->osdc; | |
4908b822 | 945 | ssize_t count = iov_iter_count(from), written = 0; |
03d254ed | 946 | int err, want, got; |
4908b822 | 947 | loff_t pos = iocb->ki_pos; |
124e68e7 SW |
948 | |
949 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
950 | return -EROFS; | |
951 | ||
03d254ed | 952 | mutex_lock(&inode->i_mutex); |
03d254ed | 953 | |
03d254ed | 954 | /* We can write back this queue in page reclaim */ |
de1414a6 | 955 | current->backing_dev_info = inode_to_bdi(inode); |
03d254ed YZ |
956 | |
957 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
958 | if (err) | |
959 | goto out; | |
960 | ||
961 | if (count == 0) | |
962 | goto out; | |
4908b822 | 963 | iov_iter_truncate(from, count); |
03d254ed YZ |
964 | |
965 | err = file_remove_suid(file); | |
966 | if (err) | |
967 | goto out; | |
968 | ||
969 | err = file_update_time(file); | |
970 | if (err) | |
971 | goto out; | |
972 | ||
28127bdd YZ |
973 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
974 | err = ceph_uninline_data(file, NULL); | |
975 | if (err < 0) | |
976 | goto out; | |
977 | } | |
978 | ||
124e68e7 | 979 | retry_snap: |
6070e0c1 | 980 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) { |
03d254ed | 981 | err = -ENOSPC; |
6070e0c1 YZ |
982 | goto out; |
983 | } | |
03d254ed | 984 | |
ac7f29bf | 985 | dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n", |
03d254ed | 986 | inode, ceph_vinop(inode), pos, count, inode->i_size); |
7971bd92 SW |
987 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
988 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
989 | else | |
990 | want = CEPH_CAP_FILE_BUFFER; | |
03d254ed | 991 | got = 0; |
3738daa6 YZ |
992 | err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count, |
993 | &got, NULL); | |
03d254ed | 994 | if (err < 0) |
37505d57 | 995 | goto out; |
124e68e7 | 996 | |
ac7f29bf | 997 | dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n", |
03d254ed | 998 | inode, ceph_vinop(inode), pos, count, ceph_cap_string(got)); |
7971bd92 SW |
999 | |
1000 | if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || | |
e8344e66 | 1001 | (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) { |
4908b822 | 1002 | struct iov_iter data; |
37505d57 | 1003 | mutex_unlock(&inode->i_mutex); |
4908b822 AV |
1004 | /* we might need to revert back to that point */ |
1005 | data = *from; | |
e8344e66 | 1006 | if (file->f_flags & O_DIRECT) |
06fee30f | 1007 | written = ceph_sync_direct_write(iocb, &data, pos); |
e8344e66 | 1008 | else |
06fee30f | 1009 | written = ceph_sync_write(iocb, &data, pos); |
0e5dd45c | 1010 | if (written == -EOLDSNAPC) { |
1011 | dout("aio_write %p %llx.%llx %llu~%u" | |
1012 | "got EOLDSNAPC, retrying\n", | |
1013 | inode, ceph_vinop(inode), | |
4908b822 | 1014 | pos, (unsigned)count); |
0e5dd45c | 1015 | mutex_lock(&inode->i_mutex); |
0e5dd45c | 1016 | goto retry_snap; |
1017 | } | |
4908b822 AV |
1018 | if (written > 0) |
1019 | iov_iter_advance(from, written); | |
7971bd92 | 1020 | } else { |
32d3e148 | 1021 | loff_t old_size = inode->i_size; |
b0d7c223 YZ |
1022 | /* |
1023 | * No need to acquire the i_truncate_mutex. Because | |
1024 | * the MDS revokes Fwb caps before sending truncate | |
1025 | * message to us. We can't get Fwb cap while there | |
1026 | * are pending vmtruncate. So write and vmtruncate | |
1027 | * can not run at the same time | |
1028 | */ | |
4908b822 | 1029 | written = generic_perform_write(file, from, pos); |
aec605f4 AV |
1030 | if (likely(written >= 0)) |
1031 | iocb->ki_pos = pos + written; | |
32d3e148 YW |
1032 | if (inode->i_size > old_size) |
1033 | ceph_fscache_update_objectsize(inode); | |
6070e0c1 | 1034 | mutex_unlock(&inode->i_mutex); |
7971bd92 | 1035 | } |
d8de9ab6 | 1036 | |
03d254ed | 1037 | if (written >= 0) { |
fca65b4a | 1038 | int dirty; |
be655596 | 1039 | spin_lock(&ci->i_ceph_lock); |
28127bdd | 1040 | ci->i_inline_version = CEPH_INLINE_NONE; |
fca65b4a | 1041 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); |
be655596 | 1042 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
1043 | if (dirty) |
1044 | __mark_inode_dirty(inode, dirty); | |
124e68e7 | 1045 | } |
7971bd92 | 1046 | |
124e68e7 | 1047 | dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", |
4908b822 | 1048 | inode, ceph_vinop(inode), pos, (unsigned)count, |
7971bd92 | 1049 | ceph_cap_string(got)); |
124e68e7 | 1050 | ceph_put_cap_refs(ci, got); |
7971bd92 | 1051 | |
03d254ed | 1052 | if (written >= 0 && |
6070e0c1 YZ |
1053 | ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || |
1054 | ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { | |
03d254ed | 1055 | err = vfs_fsync_range(file, pos, pos + written - 1, 1); |
6070e0c1 | 1056 | if (err < 0) |
03d254ed | 1057 | written = err; |
6070e0c1 | 1058 | } |
03d254ed | 1059 | |
2f75e9e1 SW |
1060 | goto out_unlocked; |
1061 | ||
03d254ed | 1062 | out: |
2f75e9e1 SW |
1063 | mutex_unlock(&inode->i_mutex); |
1064 | out_unlocked: | |
03d254ed | 1065 | current->backing_dev_info = NULL; |
03d254ed | 1066 | return written ? written : err; |
124e68e7 SW |
1067 | } |
1068 | ||
1069 | /* | |
1070 | * llseek. be sure to verify file size on SEEK_END. | |
1071 | */ | |
965c8e59 | 1072 | static loff_t ceph_llseek(struct file *file, loff_t offset, int whence) |
124e68e7 SW |
1073 | { |
1074 | struct inode *inode = file->f_mapping->host; | |
1075 | int ret; | |
1076 | ||
1077 | mutex_lock(&inode->i_mutex); | |
6a82c47a | 1078 | |
965c8e59 | 1079 | if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) { |
508b32d8 | 1080 | ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); |
124e68e7 SW |
1081 | if (ret < 0) { |
1082 | offset = ret; | |
1083 | goto out; | |
1084 | } | |
06222e49 JB |
1085 | } |
1086 | ||
965c8e59 | 1087 | switch (whence) { |
06222e49 | 1088 | case SEEK_END: |
124e68e7 SW |
1089 | offset += inode->i_size; |
1090 | break; | |
1091 | case SEEK_CUR: | |
1092 | /* | |
1093 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
1094 | * position-querying operation. Avoid rewriting the "same" | |
1095 | * f_pos value back to the file because a concurrent read(), | |
1096 | * write() or lseek() might have altered it | |
1097 | */ | |
1098 | if (offset == 0) { | |
1099 | offset = file->f_pos; | |
1100 | goto out; | |
1101 | } | |
1102 | offset += file->f_pos; | |
1103 | break; | |
06222e49 JB |
1104 | case SEEK_DATA: |
1105 | if (offset >= inode->i_size) { | |
1106 | ret = -ENXIO; | |
1107 | goto out; | |
1108 | } | |
1109 | break; | |
1110 | case SEEK_HOLE: | |
1111 | if (offset >= inode->i_size) { | |
1112 | ret = -ENXIO; | |
1113 | goto out; | |
1114 | } | |
1115 | offset = inode->i_size; | |
1116 | break; | |
124e68e7 SW |
1117 | } |
1118 | ||
46a1c2c7 | 1119 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
124e68e7 SW |
1120 | |
1121 | out: | |
1122 | mutex_unlock(&inode->i_mutex); | |
1123 | return offset; | |
1124 | } | |
1125 | ||
ad7a60de LW |
1126 | static inline void ceph_zero_partial_page( |
1127 | struct inode *inode, loff_t offset, unsigned size) | |
1128 | { | |
1129 | struct page *page; | |
1130 | pgoff_t index = offset >> PAGE_CACHE_SHIFT; | |
1131 | ||
1132 | page = find_lock_page(inode->i_mapping, index); | |
1133 | if (page) { | |
1134 | wait_on_page_writeback(page); | |
1135 | zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size); | |
1136 | unlock_page(page); | |
1137 | page_cache_release(page); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset, | |
1142 | loff_t length) | |
1143 | { | |
1144 | loff_t nearly = round_up(offset, PAGE_CACHE_SIZE); | |
1145 | if (offset < nearly) { | |
1146 | loff_t size = nearly - offset; | |
1147 | if (length < size) | |
1148 | size = length; | |
1149 | ceph_zero_partial_page(inode, offset, size); | |
1150 | offset += size; | |
1151 | length -= size; | |
1152 | } | |
1153 | if (length >= PAGE_CACHE_SIZE) { | |
1154 | loff_t size = round_down(length, PAGE_CACHE_SIZE); | |
1155 | truncate_pagecache_range(inode, offset, offset + size - 1); | |
1156 | offset += size; | |
1157 | length -= size; | |
1158 | } | |
1159 | if (length) | |
1160 | ceph_zero_partial_page(inode, offset, length); | |
1161 | } | |
1162 | ||
1163 | static int ceph_zero_partial_object(struct inode *inode, | |
1164 | loff_t offset, loff_t *length) | |
1165 | { | |
1166 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1167 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
1168 | struct ceph_osd_request *req; | |
1169 | int ret = 0; | |
1170 | loff_t zero = 0; | |
1171 | int op; | |
1172 | ||
1173 | if (!length) { | |
1174 | op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE; | |
1175 | length = &zero; | |
1176 | } else { | |
1177 | op = CEPH_OSD_OP_ZERO; | |
1178 | } | |
1179 | ||
1180 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, | |
1181 | ceph_vino(inode), | |
1182 | offset, length, | |
715e4cd4 | 1183 | 0, 1, op, |
ad7a60de LW |
1184 | CEPH_OSD_FLAG_WRITE | |
1185 | CEPH_OSD_FLAG_ONDISK, | |
1186 | NULL, 0, 0, false); | |
1187 | if (IS_ERR(req)) { | |
1188 | ret = PTR_ERR(req); | |
1189 | goto out; | |
1190 | } | |
1191 | ||
1192 | ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap, | |
1193 | &inode->i_mtime); | |
1194 | ||
1195 | ret = ceph_osdc_start_request(&fsc->client->osdc, req, false); | |
1196 | if (!ret) { | |
1197 | ret = ceph_osdc_wait_request(&fsc->client->osdc, req); | |
1198 | if (ret == -ENOENT) | |
1199 | ret = 0; | |
1200 | } | |
1201 | ceph_osdc_put_request(req); | |
1202 | ||
1203 | out: | |
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length) | |
1208 | { | |
1209 | int ret = 0; | |
1210 | struct ceph_inode_info *ci = ceph_inode(inode); | |
b314a90d SW |
1211 | s32 stripe_unit = ceph_file_layout_su(ci->i_layout); |
1212 | s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout); | |
1213 | s32 object_size = ceph_file_layout_object_size(ci->i_layout); | |
1214 | u64 object_set_size = object_size * stripe_count; | |
1215 | u64 nearly, t; | |
1216 | ||
1217 | /* round offset up to next period boundary */ | |
1218 | nearly = offset + object_set_size - 1; | |
1219 | t = nearly; | |
1220 | nearly -= do_div(t, object_set_size); | |
ad7a60de | 1221 | |
ad7a60de LW |
1222 | while (length && offset < nearly) { |
1223 | loff_t size = length; | |
1224 | ret = ceph_zero_partial_object(inode, offset, &size); | |
1225 | if (ret < 0) | |
1226 | return ret; | |
1227 | offset += size; | |
1228 | length -= size; | |
1229 | } | |
1230 | while (length >= object_set_size) { | |
1231 | int i; | |
1232 | loff_t pos = offset; | |
1233 | for (i = 0; i < stripe_count; ++i) { | |
1234 | ret = ceph_zero_partial_object(inode, pos, NULL); | |
1235 | if (ret < 0) | |
1236 | return ret; | |
1237 | pos += stripe_unit; | |
1238 | } | |
1239 | offset += object_set_size; | |
1240 | length -= object_set_size; | |
1241 | } | |
1242 | while (length) { | |
1243 | loff_t size = length; | |
1244 | ret = ceph_zero_partial_object(inode, offset, &size); | |
1245 | if (ret < 0) | |
1246 | return ret; | |
1247 | offset += size; | |
1248 | length -= size; | |
1249 | } | |
1250 | return ret; | |
1251 | } | |
1252 | ||
1253 | static long ceph_fallocate(struct file *file, int mode, | |
1254 | loff_t offset, loff_t length) | |
1255 | { | |
1256 | struct ceph_file_info *fi = file->private_data; | |
aa8b60e0 | 1257 | struct inode *inode = file_inode(file); |
ad7a60de LW |
1258 | struct ceph_inode_info *ci = ceph_inode(inode); |
1259 | struct ceph_osd_client *osdc = | |
1260 | &ceph_inode_to_client(inode)->client->osdc; | |
1261 | int want, got = 0; | |
1262 | int dirty; | |
1263 | int ret = 0; | |
1264 | loff_t endoff = 0; | |
1265 | loff_t size; | |
1266 | ||
494d77bf YZ |
1267 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
1268 | return -EOPNOTSUPP; | |
1269 | ||
ad7a60de LW |
1270 | if (!S_ISREG(inode->i_mode)) |
1271 | return -EOPNOTSUPP; | |
1272 | ||
ad7a60de LW |
1273 | mutex_lock(&inode->i_mutex); |
1274 | ||
1275 | if (ceph_snap(inode) != CEPH_NOSNAP) { | |
1276 | ret = -EROFS; | |
1277 | goto unlock; | |
1278 | } | |
1279 | ||
1280 | if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) && | |
1281 | !(mode & FALLOC_FL_PUNCH_HOLE)) { | |
1282 | ret = -ENOSPC; | |
1283 | goto unlock; | |
1284 | } | |
1285 | ||
28127bdd YZ |
1286 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
1287 | ret = ceph_uninline_data(file, NULL); | |
1288 | if (ret < 0) | |
1289 | goto unlock; | |
1290 | } | |
1291 | ||
ad7a60de LW |
1292 | size = i_size_read(inode); |
1293 | if (!(mode & FALLOC_FL_KEEP_SIZE)) | |
1294 | endoff = offset + length; | |
1295 | ||
1296 | if (fi->fmode & CEPH_FILE_MODE_LAZY) | |
1297 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; | |
1298 | else | |
1299 | want = CEPH_CAP_FILE_BUFFER; | |
1300 | ||
3738daa6 | 1301 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL); |
ad7a60de LW |
1302 | if (ret < 0) |
1303 | goto unlock; | |
1304 | ||
1305 | if (mode & FALLOC_FL_PUNCH_HOLE) { | |
1306 | if (offset < size) | |
1307 | ceph_zero_pagecache_range(inode, offset, length); | |
1308 | ret = ceph_zero_objects(inode, offset, length); | |
1309 | } else if (endoff > size) { | |
1310 | truncate_pagecache_range(inode, size, -1); | |
1311 | if (ceph_inode_set_size(inode, endoff)) | |
1312 | ceph_check_caps(ceph_inode(inode), | |
1313 | CHECK_CAPS_AUTHONLY, NULL); | |
1314 | } | |
1315 | ||
1316 | if (!ret) { | |
1317 | spin_lock(&ci->i_ceph_lock); | |
28127bdd | 1318 | ci->i_inline_version = CEPH_INLINE_NONE; |
ad7a60de LW |
1319 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); |
1320 | spin_unlock(&ci->i_ceph_lock); | |
1321 | if (dirty) | |
1322 | __mark_inode_dirty(inode, dirty); | |
1323 | } | |
1324 | ||
1325 | ceph_put_cap_refs(ci, got); | |
1326 | unlock: | |
1327 | mutex_unlock(&inode->i_mutex); | |
1328 | return ret; | |
1329 | } | |
1330 | ||
124e68e7 SW |
1331 | const struct file_operations ceph_file_fops = { |
1332 | .open = ceph_open, | |
1333 | .release = ceph_release, | |
1334 | .llseek = ceph_llseek, | |
3644424d | 1335 | .read = new_sync_read, |
4908b822 | 1336 | .write = new_sync_write, |
3644424d | 1337 | .read_iter = ceph_read_iter, |
4908b822 | 1338 | .write_iter = ceph_write_iter, |
124e68e7 SW |
1339 | .mmap = ceph_mmap, |
1340 | .fsync = ceph_fsync, | |
40819f6f GF |
1341 | .lock = ceph_lock, |
1342 | .flock = ceph_flock, | |
124e68e7 | 1343 | .splice_read = generic_file_splice_read, |
3551dd79 | 1344 | .splice_write = iter_file_splice_write, |
124e68e7 SW |
1345 | .unlocked_ioctl = ceph_ioctl, |
1346 | .compat_ioctl = ceph_ioctl, | |
ad7a60de | 1347 | .fallocate = ceph_fallocate, |
124e68e7 SW |
1348 | }; |
1349 |