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TOMOYO Linux Cross Reference
Linux/fs/ceph/file.c

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  1 #include <linux/ceph/ceph_debug.h>
  2 
  3 #include <linux/module.h>
  4 #include <linux/sched.h>
  5 #include <linux/slab.h>
  6 #include <linux/file.h>
  7 #include <linux/mount.h>
  8 #include <linux/namei.h>
  9 #include <linux/writeback.h>
 10 #include <linux/aio.h>
 11 #include <linux/falloc.h>
 12 
 13 #include "super.h"
 14 #include "mds_client.h"
 15 #include "cache.h"
 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 {
 46         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
 47         struct ceph_mds_client *mdsc = fsc->mdsc;
 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);
 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;
 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;
 76 
 77         switch (inode->i_mode & S_IFMT) {
 78         case S_IFREG:
 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);
 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 /*
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);
135         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
136         struct ceph_mds_client *mdsc = fsc->mdsc;
137         struct ceph_mds_request *req;
138         struct ceph_file_info *cf = file->private_data;
139         struct inode *parent_inode = NULL;
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) {
164                 spin_lock(&ci->i_ceph_lock);
165                 __ceph_get_fmode(ci, fmode);
166                 spin_unlock(&ci->i_ceph_lock);
167                 return ceph_init_file(inode, file, fmode);
168         }
169 
170         /*
171          * No need to block if we have caps on the auth MDS (for
172          * write) or any MDS (for read).  Update wanted set
173          * asynchronously.
174          */
175         spin_lock(&ci->i_ceph_lock);
176         if (__ceph_is_any_real_caps(ci) &&
177             (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
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);
185                 spin_unlock(&ci->i_ceph_lock);
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);
197                 spin_unlock(&ci->i_ceph_lock);
198                 return ceph_init_file(inode, file, fmode);
199         }
200 
201         spin_unlock(&ci->i_ceph_lock);
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         }
209         req->r_inode = inode;
210         ihold(inode);
211 
212         req->r_num_caps = 1;
213         if (flags & O_CREAT)
214                 parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
215         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
216         iput(parent_inode);
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 /*
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.
229  */
230 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
231                      struct file *file, unsigned flags, umode_t mode,
232                      int *opened)
233 {
234         struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
235         struct ceph_mds_client *mdsc = fsc->mdsc;
236         struct ceph_mds_request *req;
237         struct dentry *dn;
238         struct ceph_acls_info acls = {};
239         int err;
240 
241         dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
242              dir, dentry, dentry->d_name.len, dentry->d_name.name,
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;
251 
252         if (flags & O_CREAT) {
253                 err = ceph_pre_init_acls(dir, &mode, &acls);
254                 if (err < 0)
255                         return err;
256         }
257 
258         /* do the open */
259         req = prepare_open_request(dir->i_sb, flags, mode);
260         if (IS_ERR(req)) {
261                 err = PTR_ERR(req);
262                 goto out_acl;
263         }
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;
269                 if (acls.pagelist) {
270                         req->r_pagelist = acls.pagelist;
271                         acls.pagelist = NULL;
272                 }
273         }
274         req->r_locked_dir = dir;           /* caller holds dir->i_mutex */
275         err = ceph_mdsc_do_request(mdsc,
276                                    (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
277                                    req);
278         if (err)
279                 goto out_req;
280 
281         err = ceph_handle_snapdir(req, dentry, err);
282         if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
283                 err = ceph_handle_notrace_create(dir, dentry);
284 
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)
294                 goto out_req;
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);
301                 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
302                         ceph_init_inode_acls(dentry->d_inode, &acls);
303                         *opened |= FILE_CREATED;
304                 }
305                 err = finish_open(file, dentry, ceph_open, opened);
306         }
307 out_req:
308         if (!req->r_err && req->r_target_inode)
309                 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
310         ceph_mdsc_put_request(req);
311 out_acl:
312         ceph_release_acls_info(&acls);
313         dout("atomic_open result=%d\n", err);
314         return err;
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);
330 
331         /* wake up anyone waiting for caps on this inode */
332         wake_up_all(&ci->i_cap_wq);
333         return 0;
334 }
335 
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,
345                         struct page **pages, int num_pages,
346                         int *checkeof, bool o_direct,
347                         unsigned long buf_align)
348 {
349         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
350         struct ceph_inode_info *ci = ceph_inode(inode);
351         u64 pos, this_len, left;
352         int io_align, page_align;
353         int pages_left;
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;
367         io_align = off & ~PAGE_MASK;
368 
369 more:
370         if (o_direct)
371                 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
372         else
373                 page_align = pos & ~PAGE_MASK;
374         this_len = left;
375         ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
376                                   &ci->i_layout, pos, &this_len,
377                                   ci->i_truncate_seq,
378                                   ci->i_truncate_size,
379                                   page_pos, pages_left, page_align);
380         if (ret == -ENOENT)
381                 ret = 0;
382         hit_stripe = this_len < left;
383         was_short = ret >= 0 && ret < this_len;
384         dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
385              ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
386 
387         if (ret >= 0) {
388                 int didpages;
389                 if (was_short && (pos + ret < inode->i_size)) {
390                         u64 tmp = min(this_len - ret,
391                                         inode->i_size - pos - ret);
392                         dout(" zero gap %llu to %llu\n",
393                                 pos + ret, pos + ret + tmp);
394                         ceph_zero_page_vector_range(page_align + read + ret,
395                                                         tmp, pages);
396                         ret += tmp;
397                 }
398 
399                 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
400                 pos += ret;
401                 read = pos - off;
402                 left -= ret;
403                 page_pos += didpages;
404                 pages_left -= didpages;
405 
406                 /* hit stripe and need continue*/
407                 if (left && hit_stripe && pos < inode->i_size)
408                         goto more;
409         }
410 
411         if (read > 0) {
412                 ret = read;
413                 /* did we bounce off eof? */
414                 if (pos + left > inode->i_size)
415                         *checkeof = 1;
416         }
417 
418         dout("striped_read returns %d\n", ret);
419         return ret;
420 }
421 
422 /*
423  * Completely synchronous read and write methods.  Direct from __user
424  * buffer to osd, or directly to user pages (if O_DIRECT).
425  *
426  * If the read spans object boundary, just do multiple reads.
427  */
428 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
429                                 int *checkeof)
430 {
431         struct file *file = iocb->ki_filp;
432         struct inode *inode = file_inode(file);
433         struct page **pages;
434         u64 off = iocb->ki_pos;
435         int num_pages, ret;
436         size_t len = iov_iter_count(i);
437 
438         dout("sync_read on file %p %llu~%u %s\n", file, off,
439              (unsigned)len,
440              (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
441 
442         if (!len)
443                 return 0;
444         /*
445          * flush any page cache pages in this range.  this
446          * will make concurrent normal and sync io slow,
447          * but it will at least behave sensibly when they are
448          * in sequence.
449          */
450         ret = filemap_write_and_wait_range(inode->i_mapping, off,
451                                                 off + len);
452         if (ret < 0)
453                 return ret;
454 
455         if (file->f_flags & O_DIRECT) {
456                 while (iov_iter_count(i)) {
457                         size_t start;
458                         ssize_t n;
459 
460                         n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start);
461                         if (n < 0)
462                                 return n;
463 
464                         num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
465 
466                         ret = striped_read(inode, off, n,
467                                            pages, num_pages, checkeof,
468                                            1, start);
469 
470                         ceph_put_page_vector(pages, num_pages, true);
471 
472                         if (ret <= 0)
473                                 break;
474                         off += ret;
475                         iov_iter_advance(i, ret);
476                         if (ret < n)
477                                 break;
478                 }
479         } else {
480                 num_pages = calc_pages_for(off, len);
481                 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
482                 if (IS_ERR(pages))
483                         return PTR_ERR(pages);
484                 ret = striped_read(inode, off, len, pages,
485                                         num_pages, checkeof, 0, 0);
486                 if (ret > 0) {
487                         int l, k = 0;
488                         size_t left = ret;
489 
490                         while (left) {
491                                 size_t page_off = off & ~PAGE_MASK;
492                                 size_t copy = min_t(size_t,
493                                                     PAGE_SIZE - page_off, left);
494                                 l = copy_page_to_iter(pages[k++], page_off,
495                                                       copy, i);
496                                 off += l;
497                                 left -= l;
498                                 if (l < copy)
499                                         break;
500                         }
501                 }
502                 ceph_release_page_vector(pages, num_pages);
503         }
504 
505         if (off > iocb->ki_pos) {
506                 ret = off - iocb->ki_pos;
507                 iocb->ki_pos = off;
508         }
509 
510         dout("sync_read result %d\n", ret);
511         return ret;
512 }
513 
514 /*
515  * Write commit request unsafe callback, called to tell us when a
516  * request is unsafe (that is, in flight--has been handed to the
517  * messenger to send to its target osd).  It is called again when
518  * we've received a response message indicating the request is
519  * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
520  * is completed early (and unsuccessfully) due to a timeout or
521  * interrupt.
522  *
523  * This is used if we requested both an ACK and ONDISK commit reply
524  * from the OSD.
525  */
526 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
527 {
528         struct ceph_inode_info *ci = ceph_inode(req->r_inode);
529 
530         dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
531                 unsafe ? "un" : "");
532         if (unsafe) {
533                 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
534                 spin_lock(&ci->i_unsafe_lock);
535                 list_add_tail(&req->r_unsafe_item,
536                               &ci->i_unsafe_writes);
537                 spin_unlock(&ci->i_unsafe_lock);
538         } else {
539                 spin_lock(&ci->i_unsafe_lock);
540                 list_del_init(&req->r_unsafe_item);
541                 spin_unlock(&ci->i_unsafe_lock);
542                 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
543         }
544 }
545 
546 
547 /*
548  * Synchronous write, straight from __user pointer or user pages.
549  *
550  * If write spans object boundary, just do multiple writes.  (For a
551  * correct atomic write, we should e.g. take write locks on all
552  * objects, rollback on failure, etc.)
553  */
554 static ssize_t
555 ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
556 {
557         struct file *file = iocb->ki_filp;
558         struct inode *inode = file_inode(file);
559         struct ceph_inode_info *ci = ceph_inode(inode);
560         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
561         struct ceph_snap_context *snapc;
562         struct ceph_vino vino;
563         struct ceph_osd_request *req;
564         struct page **pages;
565         int num_pages;
566         int written = 0;
567         int flags;
568         int check_caps = 0;
569         int ret;
570         struct timespec mtime = CURRENT_TIME;
571         size_t count = iov_iter_count(from);
572 
573         if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
574                 return -EROFS;
575 
576         dout("sync_direct_write on file %p %lld~%u\n", file, pos,
577              (unsigned)count);
578 
579         ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
580         if (ret < 0)
581                 return ret;
582 
583         ret = invalidate_inode_pages2_range(inode->i_mapping,
584                                             pos >> PAGE_CACHE_SHIFT,
585                                             (pos + count) >> PAGE_CACHE_SHIFT);
586         if (ret < 0)
587                 dout("invalidate_inode_pages2_range returned %d\n", ret);
588 
589         flags = CEPH_OSD_FLAG_ORDERSNAP |
590                 CEPH_OSD_FLAG_ONDISK |
591                 CEPH_OSD_FLAG_WRITE;
592 
593         while (iov_iter_count(from) > 0) {
594                 u64 len = iov_iter_single_seg_count(from);
595                 size_t start;
596                 ssize_t n;
597 
598                 snapc = ci->i_snap_realm->cached_context;
599                 vino = ceph_vino(inode);
600                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
601                                             vino, pos, &len,
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);
609                         break;
610                 }
611 
612                 n = iov_iter_get_pages_alloc(from, &pages, len, &start);
613                 if (unlikely(n < 0)) {
614                         ret = n;
615                         ceph_osdc_put_request(req);
616                         break;
617                 }
618 
619                 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
620                 /*
621                  * throw out any page cache pages in this range. this
622                  * may block.
623                  */
624                 truncate_inode_pages_range(inode->i_mapping, pos,
625                                    (pos+n) | (PAGE_CACHE_SIZE-1));
626                 osd_req_op_extent_osd_data_pages(req, 0, pages, n, start,
627                                                 false, false);
628 
629                 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
630                 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
631 
632                 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
633                 if (!ret)
634                         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
635 
636                 ceph_put_page_vector(pages, num_pages, false);
637 
638                 ceph_osdc_put_request(req);
639                 if (ret)
640                         break;
641                 pos += n;
642                 written += n;
643                 iov_iter_advance(from, n);
644 
645                 if (pos > i_size_read(inode)) {
646                         check_caps = ceph_inode_set_size(inode, pos);
647                         if (check_caps)
648                                 ceph_check_caps(ceph_inode(inode),
649                                                 CHECK_CAPS_AUTHONLY,
650                                                 NULL);
651                 }
652         }
653 
654         if (ret != -EOLDSNAPC && written > 0) {
655                 iocb->ki_pos = pos;
656                 ret = written;
657         }
658         return ret;
659 }
660 
661 
662 /*
663  * Synchronous write, straight from __user pointer or user pages.
664  *
665  * If write spans object boundary, just do multiple writes.  (For a
666  * correct atomic write, we should e.g. take write locks on all
667  * objects, rollback on failure, etc.)
668  */
669 static ssize_t
670 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
671 {
672         struct file *file = iocb->ki_filp;
673         struct inode *inode = file_inode(file);
674         struct ceph_inode_info *ci = ceph_inode(inode);
675         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
676         struct ceph_snap_context *snapc;
677         struct ceph_vino vino;
678         struct ceph_osd_request *req;
679         struct page **pages;
680         u64 len;
681         int num_pages;
682         int written = 0;
683         int flags;
684         int check_caps = 0;
685         int ret;
686         struct timespec mtime = CURRENT_TIME;
687         size_t count = iov_iter_count(from);
688 
689         if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
690                 return -EROFS;
691 
692         dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
693 
694         ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
695         if (ret < 0)
696                 return ret;
697 
698         ret = invalidate_inode_pages2_range(inode->i_mapping,
699                                             pos >> PAGE_CACHE_SHIFT,
700                                             (pos + count) >> PAGE_CACHE_SHIFT);
701         if (ret < 0)
702                 dout("invalidate_inode_pages2_range returned %d\n", ret);
703 
704         flags = CEPH_OSD_FLAG_ORDERSNAP |
705                 CEPH_OSD_FLAG_ONDISK |
706                 CEPH_OSD_FLAG_WRITE |
707                 CEPH_OSD_FLAG_ACK;
708 
709         while ((len = iov_iter_count(from)) > 0) {
710                 size_t left;
711                 int n;
712 
713                 snapc = ci->i_snap_realm->cached_context;
714                 vino = ceph_vino(inode);
715                 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
716                                             vino, pos, &len, 1,
717                                             CEPH_OSD_OP_WRITE, flags, snapc,
718                                             ci->i_truncate_seq,
719                                             ci->i_truncate_size,
720                                             false);
721                 if (IS_ERR(req)) {
722                         ret = PTR_ERR(req);
723                         break;
724                 }
725 
726                 /*
727                  * write from beginning of first page,
728                  * regardless of io alignment
729                  */
730                 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
731 
732                 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
733                 if (IS_ERR(pages)) {
734                         ret = PTR_ERR(pages);
735                         goto out;
736                 }
737 
738                 left = len;
739                 for (n = 0; n < num_pages; n++) {
740                         size_t plen = min_t(size_t, left, PAGE_SIZE);
741                         ret = copy_page_from_iter(pages[n], 0, plen, from);
742                         if (ret != plen) {
743                                 ret = -EFAULT;
744                                 break;
745                         }
746                         left -= ret;
747                 }
748 
749                 if (ret < 0) {
750                         ceph_release_page_vector(pages, num_pages);
751                         goto out;
752                 }
753 
754                 /* get a second commit callback */
755                 req->r_unsafe_callback = ceph_sync_write_unsafe;
756                 req->r_inode = inode;
757 
758                 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
759                                                 false, true);
760 
761                 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
762                 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
763 
764                 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
765                 if (!ret)
766                         ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
767 
768 out:
769                 ceph_osdc_put_request(req);
770                 if (ret == 0) {
771                         pos += len;
772                         written += len;
773 
774                         if (pos > i_size_read(inode)) {
775                                 check_caps = ceph_inode_set_size(inode, pos);
776                                 if (check_caps)
777                                         ceph_check_caps(ceph_inode(inode),
778                                                         CHECK_CAPS_AUTHONLY,
779                                                         NULL);
780                         }
781                 } else
782                         break;
783         }
784 
785         if (ret != -EOLDSNAPC && written > 0) {
786                 ret = written;
787                 iocb->ki_pos = pos;
788         }
789         return ret;
790 }
791 
792 /*
793  * Wrap generic_file_aio_read with checks for cap bits on the inode.
794  * Atomically grab references, so that those bits are not released
795  * back to the MDS mid-read.
796  *
797  * Hmm, the sync read case isn't actually async... should it be?
798  */
799 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
800 {
801         struct file *filp = iocb->ki_filp;
802         struct ceph_file_info *fi = filp->private_data;
803         size_t len = iocb->ki_nbytes;
804         struct inode *inode = file_inode(filp);
805         struct ceph_inode_info *ci = ceph_inode(inode);
806         ssize_t ret;
807         int want, got = 0;
808         int checkeof = 0, read = 0;
809 
810 again:
811         dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
812              inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
813 
814         if (fi->fmode & CEPH_FILE_MODE_LAZY)
815                 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
816         else
817                 want = CEPH_CAP_FILE_CACHE;
818         ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
819         if (ret < 0)
820                 return ret;
821 
822         if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
823             (iocb->ki_filp->f_flags & O_DIRECT) ||
824             (fi->flags & CEPH_F_SYNC)) {
825 
826                 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
827                      inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
828                      ceph_cap_string(got));
829 
830                 /* hmm, this isn't really async... */
831                 ret = ceph_sync_read(iocb, to, &checkeof);
832         } else {
833                 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
834                      inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
835                      ceph_cap_string(got));
836 
837                 ret = generic_file_read_iter(iocb, to);
838         }
839         dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
840              inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
841         ceph_put_cap_refs(ci, got);
842 
843         if (checkeof && ret >= 0) {
844                 int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
845 
846                 /* hit EOF or hole? */
847                 if (statret == 0 && iocb->ki_pos < inode->i_size &&
848                         ret < len) {
849                         dout("sync_read hit hole, ppos %lld < size %lld"
850                              ", reading more\n", iocb->ki_pos,
851                              inode->i_size);
852 
853                         read += ret;
854                         len -= ret;
855                         checkeof = 0;
856                         goto again;
857                 }
858         }
859 
860         if (ret >= 0)
861                 ret += read;
862 
863         return ret;
864 }
865 
866 /*
867  * Take cap references to avoid releasing caps to MDS mid-write.
868  *
869  * If we are synchronous, and write with an old snap context, the OSD
870  * may return EOLDSNAPC.  In that case, retry the write.. _after_
871  * dropping our cap refs and allowing the pending snap to logically
872  * complete _before_ this write occurs.
873  *
874  * If we are near ENOSPC, write synchronously.
875  */
876 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
877 {
878         struct file *file = iocb->ki_filp;
879         struct ceph_file_info *fi = file->private_data;
880         struct inode *inode = file_inode(file);
881         struct ceph_inode_info *ci = ceph_inode(inode);
882         struct ceph_osd_client *osdc =
883                 &ceph_sb_to_client(inode->i_sb)->client->osdc;
884         ssize_t count = iov_iter_count(from), written = 0;
885         int err, want, got;
886         loff_t pos = iocb->ki_pos;
887 
888         if (ceph_snap(inode) != CEPH_NOSNAP)
889                 return -EROFS;
890 
891         mutex_lock(&inode->i_mutex);
892 
893         /* We can write back this queue in page reclaim */
894         current->backing_dev_info = file->f_mapping->backing_dev_info;
895 
896         err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
897         if (err)
898                 goto out;
899 
900         if (count == 0)
901                 goto out;
902         iov_iter_truncate(from, count);
903 
904         err = file_remove_suid(file);
905         if (err)
906                 goto out;
907 
908         err = file_update_time(file);
909         if (err)
910                 goto out;
911 
912 retry_snap:
913         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
914                 err = -ENOSPC;
915                 goto out;
916         }
917 
918         dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
919              inode, ceph_vinop(inode), pos, count, inode->i_size);
920         if (fi->fmode & CEPH_FILE_MODE_LAZY)
921                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
922         else
923                 want = CEPH_CAP_FILE_BUFFER;
924         got = 0;
925         err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
926         if (err < 0)
927                 goto out;
928 
929         dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
930              inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
931 
932         if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
933             (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
934                 struct iov_iter data;
935                 mutex_unlock(&inode->i_mutex);
936                 /* we might need to revert back to that point */
937                 data = *from;
938                 if (file->f_flags & O_DIRECT)
939                         written = ceph_sync_direct_write(iocb, &data, pos);
940                 else
941                         written = ceph_sync_write(iocb, &data, pos);
942                 if (written == -EOLDSNAPC) {
943                         dout("aio_write %p %llx.%llx %llu~%u"
944                                 "got EOLDSNAPC, retrying\n",
945                                 inode, ceph_vinop(inode),
946                                 pos, (unsigned)count);
947                         mutex_lock(&inode->i_mutex);
948                         goto retry_snap;
949                 }
950                 if (written > 0)
951                         iov_iter_advance(from, written);
952         } else {
953                 loff_t old_size = inode->i_size;
954                 /*
955                  * No need to acquire the i_truncate_mutex. Because
956                  * the MDS revokes Fwb caps before sending truncate
957                  * message to us. We can't get Fwb cap while there
958                  * are pending vmtruncate. So write and vmtruncate
959                  * can not run at the same time
960                  */
961                 written = generic_perform_write(file, from, pos);
962                 if (likely(written >= 0))
963                         iocb->ki_pos = pos + written;
964                 if (inode->i_size > old_size)
965                         ceph_fscache_update_objectsize(inode);
966                 mutex_unlock(&inode->i_mutex);
967         }
968 
969         if (written >= 0) {
970                 int dirty;
971                 spin_lock(&ci->i_ceph_lock);
972                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
973                 spin_unlock(&ci->i_ceph_lock);
974                 if (dirty)
975                         __mark_inode_dirty(inode, dirty);
976         }
977 
978         dout("aio_write %p %llx.%llx %llu~%u  dropping cap refs on %s\n",
979              inode, ceph_vinop(inode), pos, (unsigned)count,
980              ceph_cap_string(got));
981         ceph_put_cap_refs(ci, got);
982 
983         if (written >= 0 &&
984             ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
985              ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
986                 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
987                 if (err < 0)
988                         written = err;
989         }
990 
991         goto out_unlocked;
992 
993 out:
994         mutex_unlock(&inode->i_mutex);
995 out_unlocked:
996         current->backing_dev_info = NULL;
997         return written ? written : err;
998 }
999 
1000 /*
1001  * llseek.  be sure to verify file size on SEEK_END.
1002  */
1003 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1004 {
1005         struct inode *inode = file->f_mapping->host;
1006         int ret;
1007 
1008         mutex_lock(&inode->i_mutex);
1009 
1010         if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1011                 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1012                 if (ret < 0) {
1013                         offset = ret;
1014                         goto out;
1015                 }
1016         }
1017 
1018         switch (whence) {
1019         case SEEK_END:
1020                 offset += inode->i_size;
1021                 break;
1022         case SEEK_CUR:
1023                 /*
1024                  * Here we special-case the lseek(fd, 0, SEEK_CUR)
1025                  * position-querying operation.  Avoid rewriting the "same"
1026                  * f_pos value back to the file because a concurrent read(),
1027                  * write() or lseek() might have altered it
1028                  */
1029                 if (offset == 0) {
1030                         offset = file->f_pos;
1031                         goto out;
1032                 }
1033                 offset += file->f_pos;
1034                 break;
1035         case SEEK_DATA:
1036                 if (offset >= inode->i_size) {
1037                         ret = -ENXIO;
1038                         goto out;
1039                 }
1040                 break;
1041         case SEEK_HOLE:
1042                 if (offset >= inode->i_size) {
1043                         ret = -ENXIO;
1044                         goto out;
1045                 }
1046                 offset = inode->i_size;
1047                 break;
1048         }
1049 
1050         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1051 
1052 out:
1053         mutex_unlock(&inode->i_mutex);
1054         return offset;
1055 }
1056 
1057 static inline void ceph_zero_partial_page(
1058         struct inode *inode, loff_t offset, unsigned size)
1059 {
1060         struct page *page;
1061         pgoff_t index = offset >> PAGE_CACHE_SHIFT;
1062 
1063         page = find_lock_page(inode->i_mapping, index);
1064         if (page) {
1065                 wait_on_page_writeback(page);
1066                 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
1067                 unlock_page(page);
1068                 page_cache_release(page);
1069         }
1070 }
1071 
1072 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1073                                       loff_t length)
1074 {
1075         loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
1076         if (offset < nearly) {
1077                 loff_t size = nearly - offset;
1078                 if (length < size)
1079                         size = length;
1080                 ceph_zero_partial_page(inode, offset, size);
1081                 offset += size;
1082                 length -= size;
1083         }
1084         if (length >= PAGE_CACHE_SIZE) {
1085                 loff_t size = round_down(length, PAGE_CACHE_SIZE);
1086                 truncate_pagecache_range(inode, offset, offset + size - 1);
1087                 offset += size;
1088                 length -= size;
1089         }
1090         if (length)
1091                 ceph_zero_partial_page(inode, offset, length);
1092 }
1093 
1094 static int ceph_zero_partial_object(struct inode *inode,
1095                                     loff_t offset, loff_t *length)
1096 {
1097         struct ceph_inode_info *ci = ceph_inode(inode);
1098         struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1099         struct ceph_osd_request *req;
1100         int ret = 0;
1101         loff_t zero = 0;
1102         int op;
1103 
1104         if (!length) {
1105                 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1106                 length = &zero;
1107         } else {
1108                 op = CEPH_OSD_OP_ZERO;
1109         }
1110 
1111         req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1112                                         ceph_vino(inode),
1113                                         offset, length,
1114                                         1, op,
1115                                         CEPH_OSD_FLAG_WRITE |
1116                                         CEPH_OSD_FLAG_ONDISK,
1117                                         NULL, 0, 0, false);
1118         if (IS_ERR(req)) {
1119                 ret = PTR_ERR(req);
1120                 goto out;
1121         }
1122 
1123         ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1124                                 &inode->i_mtime);
1125 
1126         ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1127         if (!ret) {
1128                 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1129                 if (ret == -ENOENT)
1130                         ret = 0;
1131         }
1132         ceph_osdc_put_request(req);
1133 
1134 out:
1135         return ret;
1136 }
1137 
1138 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1139 {
1140         int ret = 0;
1141         struct ceph_inode_info *ci = ceph_inode(inode);
1142         s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1143         s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1144         s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1145         u64 object_set_size = object_size * stripe_count;
1146         u64 nearly, t;
1147 
1148         /* round offset up to next period boundary */
1149         nearly = offset + object_set_size - 1;
1150         t = nearly;
1151         nearly -= do_div(t, object_set_size);
1152 
1153         while (length && offset < nearly) {
1154                 loff_t size = length;
1155                 ret = ceph_zero_partial_object(inode, offset, &size);
1156                 if (ret < 0)
1157                         return ret;
1158                 offset += size;
1159                 length -= size;
1160         }
1161         while (length >= object_set_size) {
1162                 int i;
1163                 loff_t pos = offset;
1164                 for (i = 0; i < stripe_count; ++i) {
1165                         ret = ceph_zero_partial_object(inode, pos, NULL);
1166                         if (ret < 0)
1167                                 return ret;
1168                         pos += stripe_unit;
1169                 }
1170                 offset += object_set_size;
1171                 length -= object_set_size;
1172         }
1173         while (length) {
1174                 loff_t size = length;
1175                 ret = ceph_zero_partial_object(inode, offset, &size);
1176                 if (ret < 0)
1177                         return ret;
1178                 offset += size;
1179                 length -= size;
1180         }
1181         return ret;
1182 }
1183 
1184 static long ceph_fallocate(struct file *file, int mode,
1185                                 loff_t offset, loff_t length)
1186 {
1187         struct ceph_file_info *fi = file->private_data;
1188         struct inode *inode = file_inode(file);
1189         struct ceph_inode_info *ci = ceph_inode(inode);
1190         struct ceph_osd_client *osdc =
1191                 &ceph_inode_to_client(inode)->client->osdc;
1192         int want, got = 0;
1193         int dirty;
1194         int ret = 0;
1195         loff_t endoff = 0;
1196         loff_t size;
1197 
1198         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1199                 return -EOPNOTSUPP;
1200 
1201         if (!S_ISREG(inode->i_mode))
1202                 return -EOPNOTSUPP;
1203 
1204         mutex_lock(&inode->i_mutex);
1205 
1206         if (ceph_snap(inode) != CEPH_NOSNAP) {
1207                 ret = -EROFS;
1208                 goto unlock;
1209         }
1210 
1211         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1212                 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1213                 ret = -ENOSPC;
1214                 goto unlock;
1215         }
1216 
1217         size = i_size_read(inode);
1218         if (!(mode & FALLOC_FL_KEEP_SIZE))
1219                 endoff = offset + length;
1220 
1221         if (fi->fmode & CEPH_FILE_MODE_LAZY)
1222                 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1223         else
1224                 want = CEPH_CAP_FILE_BUFFER;
1225 
1226         ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
1227         if (ret < 0)
1228                 goto unlock;
1229 
1230         if (mode & FALLOC_FL_PUNCH_HOLE) {
1231                 if (offset < size)
1232                         ceph_zero_pagecache_range(inode, offset, length);
1233                 ret = ceph_zero_objects(inode, offset, length);
1234         } else if (endoff > size) {
1235                 truncate_pagecache_range(inode, size, -1);
1236                 if (ceph_inode_set_size(inode, endoff))
1237                         ceph_check_caps(ceph_inode(inode),
1238                                 CHECK_CAPS_AUTHONLY, NULL);
1239         }
1240 
1241         if (!ret) {
1242                 spin_lock(&ci->i_ceph_lock);
1243                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1244                 spin_unlock(&ci->i_ceph_lock);
1245                 if (dirty)
1246                         __mark_inode_dirty(inode, dirty);
1247         }
1248 
1249         ceph_put_cap_refs(ci, got);
1250 unlock:
1251         mutex_unlock(&inode->i_mutex);
1252         return ret;
1253 }
1254 
1255 const struct file_operations ceph_file_fops = {
1256         .open = ceph_open,
1257         .release = ceph_release,
1258         .llseek = ceph_llseek,
1259         .read = new_sync_read,
1260         .write = new_sync_write,
1261         .read_iter = ceph_read_iter,
1262         .write_iter = ceph_write_iter,
1263         .mmap = ceph_mmap,
1264         .fsync = ceph_fsync,
1265         .lock = ceph_lock,
1266         .flock = ceph_flock,
1267         .splice_read = generic_file_splice_read,
1268         .splice_write = iter_file_splice_write,
1269         .unlocked_ioctl = ceph_ioctl,
1270         .compat_ioctl   = ceph_ioctl,
1271         .fallocate      = ceph_fallocate,
1272 };
1273 
1274 

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