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8dcc1a9d DLM |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Simple file system for zoned block devices exposing zones as files. | |
4 | * | |
5 | * Copyright (C) 2019 Western Digital Corporation or its affiliates. | |
6 | */ | |
7 | #include <linux/module.h> | |
8 | #include <linux/fs.h> | |
9 | #include <linux/magic.h> | |
10 | #include <linux/iomap.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/blkdev.h> | |
14 | #include <linux/statfs.h> | |
15 | #include <linux/writeback.h> | |
16 | #include <linux/quotaops.h> | |
17 | #include <linux/seq_file.h> | |
18 | #include <linux/parser.h> | |
19 | #include <linux/uio.h> | |
20 | #include <linux/mman.h> | |
21 | #include <linux/sched/mm.h> | |
22 | #include <linux/crc32.h> | |
02ef12a6 | 23 | #include <linux/task_io_accounting_ops.h> |
8dcc1a9d DLM |
24 | |
25 | #include "zonefs.h" | |
26 | ||
27 | static int zonefs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, | |
28 | unsigned int flags, struct iomap *iomap, | |
29 | struct iomap *srcmap) | |
30 | { | |
31 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
32 | struct super_block *sb = inode->i_sb; | |
33 | loff_t isize; | |
34 | ||
35 | /* All I/Os should always be within the file maximum size */ | |
36 | if (WARN_ON_ONCE(offset + length > zi->i_max_size)) | |
37 | return -EIO; | |
38 | ||
39 | /* | |
40 | * Sequential zones can only accept direct writes. This is already | |
41 | * checked when writes are issued, so warn if we see a page writeback | |
42 | * operation. | |
43 | */ | |
44 | if (WARN_ON_ONCE(zi->i_ztype == ZONEFS_ZTYPE_SEQ && | |
45 | (flags & IOMAP_WRITE) && !(flags & IOMAP_DIRECT))) | |
46 | return -EIO; | |
47 | ||
48 | /* | |
49 | * For conventional zones, all blocks are always mapped. For sequential | |
50 | * zones, all blocks after always mapped below the inode size (zone | |
51 | * write pointer) and unwriten beyond. | |
52 | */ | |
53 | mutex_lock(&zi->i_truncate_mutex); | |
54 | isize = i_size_read(inode); | |
55 | if (offset >= isize) | |
56 | iomap->type = IOMAP_UNWRITTEN; | |
57 | else | |
58 | iomap->type = IOMAP_MAPPED; | |
59 | if (flags & IOMAP_WRITE) | |
60 | length = zi->i_max_size - offset; | |
61 | else | |
62 | length = min(length, isize - offset); | |
63 | mutex_unlock(&zi->i_truncate_mutex); | |
64 | ||
65 | iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize); | |
66 | iomap->length = ALIGN(offset + length, sb->s_blocksize) - iomap->offset; | |
67 | iomap->bdev = inode->i_sb->s_bdev; | |
68 | iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static const struct iomap_ops zonefs_iomap_ops = { | |
74 | .iomap_begin = zonefs_iomap_begin, | |
75 | }; | |
76 | ||
77 | static int zonefs_readpage(struct file *unused, struct page *page) | |
78 | { | |
79 | return iomap_readpage(page, &zonefs_iomap_ops); | |
80 | } | |
81 | ||
9d24a13a | 82 | static void zonefs_readahead(struct readahead_control *rac) |
8dcc1a9d | 83 | { |
9d24a13a | 84 | iomap_readahead(rac, &zonefs_iomap_ops); |
8dcc1a9d DLM |
85 | } |
86 | ||
87 | /* | |
88 | * Map blocks for page writeback. This is used only on conventional zone files, | |
89 | * which implies that the page range can only be within the fixed inode size. | |
90 | */ | |
91 | static int zonefs_map_blocks(struct iomap_writepage_ctx *wpc, | |
92 | struct inode *inode, loff_t offset) | |
93 | { | |
94 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
95 | ||
96 | if (WARN_ON_ONCE(zi->i_ztype != ZONEFS_ZTYPE_CNV)) | |
97 | return -EIO; | |
98 | if (WARN_ON_ONCE(offset >= i_size_read(inode))) | |
99 | return -EIO; | |
100 | ||
101 | /* If the mapping is already OK, nothing needs to be done */ | |
102 | if (offset >= wpc->iomap.offset && | |
103 | offset < wpc->iomap.offset + wpc->iomap.length) | |
104 | return 0; | |
105 | ||
106 | return zonefs_iomap_begin(inode, offset, zi->i_max_size - offset, | |
107 | IOMAP_WRITE, &wpc->iomap, NULL); | |
108 | } | |
109 | ||
110 | static const struct iomap_writeback_ops zonefs_writeback_ops = { | |
111 | .map_blocks = zonefs_map_blocks, | |
112 | }; | |
113 | ||
114 | static int zonefs_writepage(struct page *page, struct writeback_control *wbc) | |
115 | { | |
116 | struct iomap_writepage_ctx wpc = { }; | |
117 | ||
118 | return iomap_writepage(page, wbc, &wpc, &zonefs_writeback_ops); | |
119 | } | |
120 | ||
121 | static int zonefs_writepages(struct address_space *mapping, | |
122 | struct writeback_control *wbc) | |
123 | { | |
124 | struct iomap_writepage_ctx wpc = { }; | |
125 | ||
126 | return iomap_writepages(mapping, wbc, &wpc, &zonefs_writeback_ops); | |
127 | } | |
128 | ||
129 | static const struct address_space_operations zonefs_file_aops = { | |
130 | .readpage = zonefs_readpage, | |
9d24a13a | 131 | .readahead = zonefs_readahead, |
8dcc1a9d DLM |
132 | .writepage = zonefs_writepage, |
133 | .writepages = zonefs_writepages, | |
134 | .set_page_dirty = iomap_set_page_dirty, | |
135 | .releasepage = iomap_releasepage, | |
136 | .invalidatepage = iomap_invalidatepage, | |
137 | .migratepage = iomap_migrate_page, | |
138 | .is_partially_uptodate = iomap_is_partially_uptodate, | |
139 | .error_remove_page = generic_error_remove_page, | |
140 | .direct_IO = noop_direct_IO, | |
141 | }; | |
142 | ||
143 | static void zonefs_update_stats(struct inode *inode, loff_t new_isize) | |
144 | { | |
145 | struct super_block *sb = inode->i_sb; | |
146 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
147 | loff_t old_isize = i_size_read(inode); | |
148 | loff_t nr_blocks; | |
149 | ||
150 | if (new_isize == old_isize) | |
151 | return; | |
152 | ||
153 | spin_lock(&sbi->s_lock); | |
154 | ||
155 | /* | |
156 | * This may be called for an update after an IO error. | |
157 | * So beware of the values seen. | |
158 | */ | |
159 | if (new_isize < old_isize) { | |
160 | nr_blocks = (old_isize - new_isize) >> sb->s_blocksize_bits; | |
161 | if (sbi->s_used_blocks > nr_blocks) | |
162 | sbi->s_used_blocks -= nr_blocks; | |
163 | else | |
164 | sbi->s_used_blocks = 0; | |
165 | } else { | |
166 | sbi->s_used_blocks += | |
167 | (new_isize - old_isize) >> sb->s_blocksize_bits; | |
168 | if (sbi->s_used_blocks > sbi->s_blocks) | |
169 | sbi->s_used_blocks = sbi->s_blocks; | |
170 | } | |
171 | ||
172 | spin_unlock(&sbi->s_lock); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Check a zone condition and adjust its file inode access permissions for | |
177 | * offline and readonly zones. Return the inode size corresponding to the | |
178 | * amount of readable data in the zone. | |
179 | */ | |
180 | static loff_t zonefs_check_zone_condition(struct inode *inode, | |
ccf4ad7d DLM |
181 | struct blk_zone *zone, bool warn, |
182 | bool mount) | |
8dcc1a9d DLM |
183 | { |
184 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
185 | ||
186 | switch (zone->cond) { | |
187 | case BLK_ZONE_COND_OFFLINE: | |
188 | /* | |
189 | * Dead zone: make the inode immutable, disable all accesses | |
190 | * and set the file size to 0 (zone wp set to zone start). | |
191 | */ | |
192 | if (warn) | |
193 | zonefs_warn(inode->i_sb, "inode %lu: offline zone\n", | |
194 | inode->i_ino); | |
195 | inode->i_flags |= S_IMMUTABLE; | |
196 | inode->i_mode &= ~0777; | |
197 | zone->wp = zone->start; | |
198 | return 0; | |
199 | case BLK_ZONE_COND_READONLY: | |
ccf4ad7d DLM |
200 | /* |
201 | * The write pointer of read-only zones is invalid. If such a | |
202 | * zone is found during mount, the file size cannot be retrieved | |
203 | * so we treat the zone as offline (mount == true case). | |
204 | * Otherwise, keep the file size as it was when last updated | |
205 | * so that the user can recover data. In both cases, writes are | |
206 | * always disabled for the zone. | |
207 | */ | |
8dcc1a9d DLM |
208 | if (warn) |
209 | zonefs_warn(inode->i_sb, "inode %lu: read-only zone\n", | |
210 | inode->i_ino); | |
211 | inode->i_flags |= S_IMMUTABLE; | |
ccf4ad7d DLM |
212 | if (mount) { |
213 | zone->cond = BLK_ZONE_COND_OFFLINE; | |
214 | inode->i_mode &= ~0777; | |
215 | zone->wp = zone->start; | |
216 | return 0; | |
217 | } | |
8dcc1a9d | 218 | inode->i_mode &= ~0222; |
ccf4ad7d | 219 | return i_size_read(inode); |
8dcc1a9d DLM |
220 | default: |
221 | if (zi->i_ztype == ZONEFS_ZTYPE_CNV) | |
222 | return zi->i_max_size; | |
223 | return (zone->wp - zone->start) << SECTOR_SHIFT; | |
224 | } | |
225 | } | |
226 | ||
227 | struct zonefs_ioerr_data { | |
228 | struct inode *inode; | |
229 | bool write; | |
230 | }; | |
231 | ||
232 | static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx, | |
233 | void *data) | |
234 | { | |
235 | struct zonefs_ioerr_data *err = data; | |
236 | struct inode *inode = err->inode; | |
237 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
238 | struct super_block *sb = inode->i_sb; | |
239 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
240 | loff_t isize, data_size; | |
241 | ||
242 | /* | |
243 | * Check the zone condition: if the zone is not "bad" (offline or | |
244 | * read-only), read errors are simply signaled to the IO issuer as long | |
245 | * as there is no inconsistency between the inode size and the amount of | |
246 | * data writen in the zone (data_size). | |
247 | */ | |
ccf4ad7d | 248 | data_size = zonefs_check_zone_condition(inode, zone, true, false); |
8dcc1a9d DLM |
249 | isize = i_size_read(inode); |
250 | if (zone->cond != BLK_ZONE_COND_OFFLINE && | |
251 | zone->cond != BLK_ZONE_COND_READONLY && | |
252 | !err->write && isize == data_size) | |
253 | return 0; | |
254 | ||
255 | /* | |
256 | * At this point, we detected either a bad zone or an inconsistency | |
257 | * between the inode size and the amount of data written in the zone. | |
258 | * For the latter case, the cause may be a write IO error or an external | |
259 | * action on the device. Two error patterns exist: | |
260 | * 1) The inode size is lower than the amount of data in the zone: | |
261 | * a write operation partially failed and data was writen at the end | |
262 | * of the file. This can happen in the case of a large direct IO | |
263 | * needing several BIOs and/or write requests to be processed. | |
264 | * 2) The inode size is larger than the amount of data in the zone: | |
265 | * this can happen with a deferred write error with the use of the | |
266 | * device side write cache after getting successful write IO | |
267 | * completions. Other possibilities are (a) an external corruption, | |
268 | * e.g. an application reset the zone directly, or (b) the device | |
269 | * has a serious problem (e.g. firmware bug). | |
270 | * | |
271 | * In all cases, warn about inode size inconsistency and handle the | |
272 | * IO error according to the zone condition and to the mount options. | |
273 | */ | |
274 | if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && isize != data_size) | |
275 | zonefs_warn(sb, "inode %lu: invalid size %lld (should be %lld)\n", | |
276 | inode->i_ino, isize, data_size); | |
277 | ||
278 | /* | |
279 | * First handle bad zones signaled by hardware. The mount options | |
280 | * errors=zone-ro and errors=zone-offline result in changing the | |
281 | * zone condition to read-only and offline respectively, as if the | |
282 | * condition was signaled by the hardware. | |
283 | */ | |
284 | if (zone->cond == BLK_ZONE_COND_OFFLINE || | |
285 | sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL) { | |
286 | zonefs_warn(sb, "inode %lu: read/write access disabled\n", | |
287 | inode->i_ino); | |
288 | if (zone->cond != BLK_ZONE_COND_OFFLINE) { | |
289 | zone->cond = BLK_ZONE_COND_OFFLINE; | |
290 | data_size = zonefs_check_zone_condition(inode, zone, | |
ccf4ad7d | 291 | false, false); |
8dcc1a9d DLM |
292 | } |
293 | } else if (zone->cond == BLK_ZONE_COND_READONLY || | |
294 | sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO) { | |
295 | zonefs_warn(sb, "inode %lu: write access disabled\n", | |
296 | inode->i_ino); | |
297 | if (zone->cond != BLK_ZONE_COND_READONLY) { | |
298 | zone->cond = BLK_ZONE_COND_READONLY; | |
299 | data_size = zonefs_check_zone_condition(inode, zone, | |
ccf4ad7d | 300 | false, false); |
8dcc1a9d DLM |
301 | } |
302 | } | |
303 | ||
304 | /* | |
305 | * If error=remount-ro was specified, any error result in remounting | |
306 | * the volume as read-only. | |
307 | */ | |
308 | if ((sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO) && !sb_rdonly(sb)) { | |
309 | zonefs_warn(sb, "remounting filesystem read-only\n"); | |
310 | sb->s_flags |= SB_RDONLY; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Update block usage stats and the inode size to prevent access to | |
315 | * invalid data. | |
316 | */ | |
317 | zonefs_update_stats(inode, data_size); | |
318 | i_size_write(inode, data_size); | |
319 | zi->i_wpoffset = data_size; | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | /* | |
325 | * When an file IO error occurs, check the file zone to see if there is a change | |
326 | * in the zone condition (e.g. offline or read-only). For a failed write to a | |
327 | * sequential zone, the zone write pointer position must also be checked to | |
328 | * eventually correct the file size and zonefs inode write pointer offset | |
329 | * (which can be out of sync with the drive due to partial write failures). | |
330 | */ | |
331 | static void zonefs_io_error(struct inode *inode, bool write) | |
332 | { | |
333 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
334 | struct super_block *sb = inode->i_sb; | |
335 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
336 | unsigned int noio_flag; | |
337 | unsigned int nr_zones = | |
e3c3155b | 338 | zi->i_zone_size >> (sbi->s_zone_sectors_shift + SECTOR_SHIFT); |
8dcc1a9d DLM |
339 | struct zonefs_ioerr_data err = { |
340 | .inode = inode, | |
341 | .write = write, | |
342 | }; | |
343 | int ret; | |
344 | ||
345 | mutex_lock(&zi->i_truncate_mutex); | |
346 | ||
347 | /* | |
348 | * Memory allocations in blkdev_report_zones() can trigger a memory | |
349 | * reclaim which may in turn cause a recursion into zonefs as well as | |
350 | * struct request allocations for the same device. The former case may | |
351 | * end up in a deadlock on the inode truncate mutex, while the latter | |
352 | * may prevent IO forward progress. Executing the report zones under | |
353 | * the GFP_NOIO context avoids both problems. | |
354 | */ | |
355 | noio_flag = memalloc_noio_save(); | |
356 | ret = blkdev_report_zones(sb->s_bdev, zi->i_zsector, nr_zones, | |
357 | zonefs_io_error_cb, &err); | |
358 | if (ret != nr_zones) | |
359 | zonefs_err(sb, "Get inode %lu zone information failed %d\n", | |
360 | inode->i_ino, ret); | |
361 | memalloc_noio_restore(noio_flag); | |
362 | ||
363 | mutex_unlock(&zi->i_truncate_mutex); | |
364 | } | |
365 | ||
366 | static int zonefs_file_truncate(struct inode *inode, loff_t isize) | |
367 | { | |
368 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
369 | loff_t old_isize; | |
370 | enum req_opf op; | |
371 | int ret = 0; | |
372 | ||
373 | /* | |
374 | * Only sequential zone files can be truncated and truncation is allowed | |
375 | * only down to a 0 size, which is equivalent to a zone reset, and to | |
376 | * the maximum file size, which is equivalent to a zone finish. | |
377 | */ | |
378 | if (zi->i_ztype != ZONEFS_ZTYPE_SEQ) | |
379 | return -EPERM; | |
380 | ||
381 | if (!isize) | |
382 | op = REQ_OP_ZONE_RESET; | |
383 | else if (isize == zi->i_max_size) | |
384 | op = REQ_OP_ZONE_FINISH; | |
385 | else | |
386 | return -EPERM; | |
387 | ||
388 | inode_dio_wait(inode); | |
389 | ||
390 | /* Serialize against page faults */ | |
391 | down_write(&zi->i_mmap_sem); | |
392 | ||
393 | /* Serialize against zonefs_iomap_begin() */ | |
394 | mutex_lock(&zi->i_truncate_mutex); | |
395 | ||
396 | old_isize = i_size_read(inode); | |
397 | if (isize == old_isize) | |
398 | goto unlock; | |
399 | ||
400 | ret = blkdev_zone_mgmt(inode->i_sb->s_bdev, op, zi->i_zsector, | |
e3c3155b | 401 | zi->i_zone_size >> SECTOR_SHIFT, GFP_NOFS); |
8dcc1a9d DLM |
402 | if (ret) { |
403 | zonefs_err(inode->i_sb, | |
404 | "Zone management operation at %llu failed %d", | |
405 | zi->i_zsector, ret); | |
406 | goto unlock; | |
407 | } | |
408 | ||
409 | zonefs_update_stats(inode, isize); | |
410 | truncate_setsize(inode, isize); | |
411 | zi->i_wpoffset = isize; | |
412 | ||
413 | unlock: | |
414 | mutex_unlock(&zi->i_truncate_mutex); | |
415 | up_write(&zi->i_mmap_sem); | |
416 | ||
417 | return ret; | |
418 | } | |
419 | ||
420 | static int zonefs_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
421 | { | |
422 | struct inode *inode = d_inode(dentry); | |
423 | int ret; | |
424 | ||
425 | if (unlikely(IS_IMMUTABLE(inode))) | |
426 | return -EPERM; | |
427 | ||
428 | ret = setattr_prepare(dentry, iattr); | |
429 | if (ret) | |
430 | return ret; | |
431 | ||
432 | /* | |
433 | * Since files and directories cannot be created nor deleted, do not | |
434 | * allow setting any write attributes on the sub-directories grouping | |
435 | * files by zone type. | |
436 | */ | |
437 | if ((iattr->ia_valid & ATTR_MODE) && S_ISDIR(inode->i_mode) && | |
438 | (iattr->ia_mode & 0222)) | |
439 | return -EPERM; | |
440 | ||
441 | if (((iattr->ia_valid & ATTR_UID) && | |
442 | !uid_eq(iattr->ia_uid, inode->i_uid)) || | |
443 | ((iattr->ia_valid & ATTR_GID) && | |
444 | !gid_eq(iattr->ia_gid, inode->i_gid))) { | |
445 | ret = dquot_transfer(inode, iattr); | |
446 | if (ret) | |
447 | return ret; | |
448 | } | |
449 | ||
450 | if (iattr->ia_valid & ATTR_SIZE) { | |
451 | ret = zonefs_file_truncate(inode, iattr->ia_size); | |
452 | if (ret) | |
453 | return ret; | |
454 | } | |
455 | ||
456 | setattr_copy(inode, iattr); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static const struct inode_operations zonefs_file_inode_operations = { | |
462 | .setattr = zonefs_inode_setattr, | |
463 | }; | |
464 | ||
465 | static int zonefs_file_fsync(struct file *file, loff_t start, loff_t end, | |
466 | int datasync) | |
467 | { | |
468 | struct inode *inode = file_inode(file); | |
469 | int ret = 0; | |
470 | ||
471 | if (unlikely(IS_IMMUTABLE(inode))) | |
472 | return -EPERM; | |
473 | ||
474 | /* | |
475 | * Since only direct writes are allowed in sequential files, page cache | |
476 | * flush is needed only for conventional zone files. | |
477 | */ | |
478 | if (ZONEFS_I(inode)->i_ztype == ZONEFS_ZTYPE_CNV) | |
479 | ret = file_write_and_wait_range(file, start, end); | |
480 | if (!ret) | |
9398554f | 481 | ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL); |
8dcc1a9d DLM |
482 | |
483 | if (ret) | |
484 | zonefs_io_error(inode, true); | |
485 | ||
486 | return ret; | |
487 | } | |
488 | ||
489 | static vm_fault_t zonefs_filemap_fault(struct vm_fault *vmf) | |
490 | { | |
491 | struct zonefs_inode_info *zi = ZONEFS_I(file_inode(vmf->vma->vm_file)); | |
492 | vm_fault_t ret; | |
493 | ||
494 | down_read(&zi->i_mmap_sem); | |
495 | ret = filemap_fault(vmf); | |
496 | up_read(&zi->i_mmap_sem); | |
497 | ||
498 | return ret; | |
499 | } | |
500 | ||
501 | static vm_fault_t zonefs_filemap_page_mkwrite(struct vm_fault *vmf) | |
502 | { | |
503 | struct inode *inode = file_inode(vmf->vma->vm_file); | |
504 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
505 | vm_fault_t ret; | |
506 | ||
507 | if (unlikely(IS_IMMUTABLE(inode))) | |
508 | return VM_FAULT_SIGBUS; | |
509 | ||
510 | /* | |
511 | * Sanity check: only conventional zone files can have shared | |
512 | * writeable mappings. | |
513 | */ | |
514 | if (WARN_ON_ONCE(zi->i_ztype != ZONEFS_ZTYPE_CNV)) | |
515 | return VM_FAULT_NOPAGE; | |
516 | ||
517 | sb_start_pagefault(inode->i_sb); | |
518 | file_update_time(vmf->vma->vm_file); | |
519 | ||
520 | /* Serialize against truncates */ | |
521 | down_read(&zi->i_mmap_sem); | |
522 | ret = iomap_page_mkwrite(vmf, &zonefs_iomap_ops); | |
523 | up_read(&zi->i_mmap_sem); | |
524 | ||
525 | sb_end_pagefault(inode->i_sb); | |
526 | return ret; | |
527 | } | |
528 | ||
529 | static const struct vm_operations_struct zonefs_file_vm_ops = { | |
530 | .fault = zonefs_filemap_fault, | |
531 | .map_pages = filemap_map_pages, | |
532 | .page_mkwrite = zonefs_filemap_page_mkwrite, | |
533 | }; | |
534 | ||
535 | static int zonefs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
536 | { | |
537 | /* | |
538 | * Conventional zones accept random writes, so their files can support | |
539 | * shared writable mappings. For sequential zone files, only read | |
540 | * mappings are possible since there are no guarantees for write | |
541 | * ordering between msync() and page cache writeback. | |
542 | */ | |
543 | if (ZONEFS_I(file_inode(file))->i_ztype == ZONEFS_ZTYPE_SEQ && | |
544 | (vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) | |
545 | return -EINVAL; | |
546 | ||
547 | file_accessed(file); | |
548 | vma->vm_ops = &zonefs_file_vm_ops; | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | static loff_t zonefs_file_llseek(struct file *file, loff_t offset, int whence) | |
554 | { | |
555 | loff_t isize = i_size_read(file_inode(file)); | |
556 | ||
557 | /* | |
558 | * Seeks are limited to below the zone size for conventional zones | |
559 | * and below the zone write pointer for sequential zones. In both | |
560 | * cases, this limit is the inode size. | |
561 | */ | |
562 | return generic_file_llseek_size(file, offset, whence, isize, isize); | |
563 | } | |
564 | ||
565 | static int zonefs_file_write_dio_end_io(struct kiocb *iocb, ssize_t size, | |
566 | int error, unsigned int flags) | |
567 | { | |
568 | struct inode *inode = file_inode(iocb->ki_filp); | |
569 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
570 | ||
571 | if (error) { | |
572 | zonefs_io_error(inode, true); | |
573 | return error; | |
574 | } | |
575 | ||
576 | if (size && zi->i_ztype != ZONEFS_ZTYPE_CNV) { | |
577 | /* | |
578 | * Note that we may be seeing completions out of order, | |
579 | * but that is not a problem since a write completed | |
580 | * successfully necessarily means that all preceding writes | |
581 | * were also successful. So we can safely increase the inode | |
582 | * size to the write end location. | |
583 | */ | |
584 | mutex_lock(&zi->i_truncate_mutex); | |
585 | if (i_size_read(inode) < iocb->ki_pos + size) { | |
586 | zonefs_update_stats(inode, iocb->ki_pos + size); | |
587 | i_size_write(inode, iocb->ki_pos + size); | |
588 | } | |
589 | mutex_unlock(&zi->i_truncate_mutex); | |
590 | } | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | static const struct iomap_dio_ops zonefs_write_dio_ops = { | |
596 | .end_io = zonefs_file_write_dio_end_io, | |
597 | }; | |
598 | ||
02ef12a6 JT |
599 | static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from) |
600 | { | |
601 | struct inode *inode = file_inode(iocb->ki_filp); | |
602 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
603 | struct block_device *bdev = inode->i_sb->s_bdev; | |
604 | unsigned int max; | |
605 | struct bio *bio; | |
606 | ssize_t size; | |
607 | int nr_pages; | |
608 | ssize_t ret; | |
609 | ||
02ef12a6 JT |
610 | max = queue_max_zone_append_sectors(bdev_get_queue(bdev)); |
611 | max = ALIGN_DOWN(max << SECTOR_SHIFT, inode->i_sb->s_blocksize); | |
612 | iov_iter_truncate(from, max); | |
613 | ||
89ee7237 JT |
614 | nr_pages = iov_iter_npages(from, BIO_MAX_PAGES); |
615 | if (!nr_pages) | |
616 | return 0; | |
617 | ||
02ef12a6 JT |
618 | bio = bio_alloc_bioset(GFP_NOFS, nr_pages, &fs_bio_set); |
619 | if (!bio) | |
620 | return -ENOMEM; | |
621 | ||
622 | bio_set_dev(bio, bdev); | |
623 | bio->bi_iter.bi_sector = zi->i_zsector; | |
624 | bio->bi_write_hint = iocb->ki_hint; | |
625 | bio->bi_ioprio = iocb->ki_ioprio; | |
626 | bio->bi_opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE; | |
627 | if (iocb->ki_flags & IOCB_DSYNC) | |
628 | bio->bi_opf |= REQ_FUA; | |
629 | ||
630 | ret = bio_iov_iter_get_pages(bio, from); | |
631 | if (unlikely(ret)) { | |
632 | bio_io_error(bio); | |
633 | return ret; | |
634 | } | |
635 | size = bio->bi_iter.bi_size; | |
636 | task_io_account_write(ret); | |
637 | ||
638 | if (iocb->ki_flags & IOCB_HIPRI) | |
639 | bio_set_polled(bio, iocb); | |
640 | ||
641 | ret = submit_bio_wait(bio); | |
642 | ||
643 | bio_put(bio); | |
644 | ||
645 | zonefs_file_write_dio_end_io(iocb, size, ret, 0); | |
646 | if (ret >= 0) { | |
647 | iocb->ki_pos += size; | |
648 | return size; | |
649 | } | |
650 | ||
651 | return ret; | |
652 | } | |
653 | ||
8dcc1a9d DLM |
654 | /* |
655 | * Handle direct writes. For sequential zone files, this is the only possible | |
656 | * write path. For these files, check that the user is issuing writes | |
657 | * sequentially from the end of the file. This code assumes that the block layer | |
658 | * delivers write requests to the device in sequential order. This is always the | |
659 | * case if a block IO scheduler implementing the ELEVATOR_F_ZBD_SEQ_WRITE | |
660 | * elevator feature is being used (e.g. mq-deadline). The block layer always | |
661 | * automatically select such an elevator for zoned block devices during the | |
662 | * device initialization. | |
663 | */ | |
664 | static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from) | |
665 | { | |
666 | struct inode *inode = file_inode(iocb->ki_filp); | |
667 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
668 | struct super_block *sb = inode->i_sb; | |
02ef12a6 JT |
669 | bool sync = is_sync_kiocb(iocb); |
670 | bool append = false; | |
8dcc1a9d DLM |
671 | size_t count; |
672 | ssize_t ret; | |
673 | ||
674 | /* | |
7c69eb84 | 675 | * For async direct IOs to sequential zone files, refuse IOCB_NOWAIT |
8dcc1a9d DLM |
676 | * as this can cause write reordering (e.g. the first aio gets EAGAIN |
677 | * on the inode lock but the second goes through but is now unaligned). | |
678 | */ | |
02ef12a6 | 679 | if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && !sync && |
7c69eb84 CH |
680 | (iocb->ki_flags & IOCB_NOWAIT)) |
681 | return -EOPNOTSUPP; | |
8dcc1a9d DLM |
682 | |
683 | if (iocb->ki_flags & IOCB_NOWAIT) { | |
684 | if (!inode_trylock(inode)) | |
685 | return -EAGAIN; | |
686 | } else { | |
687 | inode_lock(inode); | |
688 | } | |
689 | ||
690 | ret = generic_write_checks(iocb, from); | |
691 | if (ret <= 0) | |
692 | goto inode_unlock; | |
693 | ||
694 | iov_iter_truncate(from, zi->i_max_size - iocb->ki_pos); | |
695 | count = iov_iter_count(from); | |
696 | ||
697 | if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) { | |
698 | ret = -EINVAL; | |
699 | goto inode_unlock; | |
700 | } | |
701 | ||
702 | /* Enforce sequential writes (append only) in sequential zones */ | |
02ef12a6 JT |
703 | if (zi->i_ztype == ZONEFS_ZTYPE_SEQ) { |
704 | mutex_lock(&zi->i_truncate_mutex); | |
705 | if (iocb->ki_pos != zi->i_wpoffset) { | |
706 | mutex_unlock(&zi->i_truncate_mutex); | |
707 | ret = -EINVAL; | |
708 | goto inode_unlock; | |
709 | } | |
8dcc1a9d | 710 | mutex_unlock(&zi->i_truncate_mutex); |
02ef12a6 | 711 | append = sync; |
8dcc1a9d | 712 | } |
8dcc1a9d | 713 | |
02ef12a6 JT |
714 | if (append) |
715 | ret = zonefs_file_dio_append(iocb, from); | |
716 | else | |
717 | ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops, | |
718 | &zonefs_write_dio_ops, sync); | |
8dcc1a9d DLM |
719 | if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && |
720 | (ret > 0 || ret == -EIOCBQUEUED)) { | |
721 | if (ret > 0) | |
722 | count = ret; | |
723 | mutex_lock(&zi->i_truncate_mutex); | |
724 | zi->i_wpoffset += count; | |
725 | mutex_unlock(&zi->i_truncate_mutex); | |
726 | } | |
727 | ||
728 | inode_unlock: | |
729 | inode_unlock(inode); | |
730 | ||
731 | return ret; | |
732 | } | |
733 | ||
734 | static ssize_t zonefs_file_buffered_write(struct kiocb *iocb, | |
735 | struct iov_iter *from) | |
736 | { | |
737 | struct inode *inode = file_inode(iocb->ki_filp); | |
738 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
739 | ssize_t ret; | |
740 | ||
741 | /* | |
742 | * Direct IO writes are mandatory for sequential zone files so that the | |
743 | * write IO issuing order is preserved. | |
744 | */ | |
745 | if (zi->i_ztype != ZONEFS_ZTYPE_CNV) | |
746 | return -EIO; | |
747 | ||
748 | if (iocb->ki_flags & IOCB_NOWAIT) { | |
749 | if (!inode_trylock(inode)) | |
750 | return -EAGAIN; | |
751 | } else { | |
752 | inode_lock(inode); | |
753 | } | |
754 | ||
755 | ret = generic_write_checks(iocb, from); | |
756 | if (ret <= 0) | |
757 | goto inode_unlock; | |
758 | ||
759 | iov_iter_truncate(from, zi->i_max_size - iocb->ki_pos); | |
760 | ||
761 | ret = iomap_file_buffered_write(iocb, from, &zonefs_iomap_ops); | |
762 | if (ret > 0) | |
763 | iocb->ki_pos += ret; | |
764 | else if (ret == -EIO) | |
765 | zonefs_io_error(inode, true); | |
766 | ||
767 | inode_unlock: | |
768 | inode_unlock(inode); | |
769 | if (ret > 0) | |
770 | ret = generic_write_sync(iocb, ret); | |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
775 | static ssize_t zonefs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) | |
776 | { | |
777 | struct inode *inode = file_inode(iocb->ki_filp); | |
778 | ||
779 | if (unlikely(IS_IMMUTABLE(inode))) | |
780 | return -EPERM; | |
781 | ||
782 | if (sb_rdonly(inode->i_sb)) | |
783 | return -EROFS; | |
784 | ||
785 | /* Write operations beyond the zone size are not allowed */ | |
786 | if (iocb->ki_pos >= ZONEFS_I(inode)->i_max_size) | |
787 | return -EFBIG; | |
788 | ||
60263d58 CH |
789 | if (iocb->ki_flags & IOCB_DIRECT) { |
790 | ssize_t ret = zonefs_file_dio_write(iocb, from); | |
791 | if (ret != -ENOTBLK) | |
792 | return ret; | |
793 | } | |
8dcc1a9d DLM |
794 | |
795 | return zonefs_file_buffered_write(iocb, from); | |
796 | } | |
797 | ||
798 | static int zonefs_file_read_dio_end_io(struct kiocb *iocb, ssize_t size, | |
799 | int error, unsigned int flags) | |
800 | { | |
801 | if (error) { | |
802 | zonefs_io_error(file_inode(iocb->ki_filp), false); | |
803 | return error; | |
804 | } | |
805 | ||
806 | return 0; | |
807 | } | |
808 | ||
809 | static const struct iomap_dio_ops zonefs_read_dio_ops = { | |
810 | .end_io = zonefs_file_read_dio_end_io, | |
811 | }; | |
812 | ||
813 | static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) | |
814 | { | |
815 | struct inode *inode = file_inode(iocb->ki_filp); | |
816 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
817 | struct super_block *sb = inode->i_sb; | |
818 | loff_t isize; | |
819 | ssize_t ret; | |
820 | ||
821 | /* Offline zones cannot be read */ | |
822 | if (unlikely(IS_IMMUTABLE(inode) && !(inode->i_mode & 0777))) | |
823 | return -EPERM; | |
824 | ||
825 | if (iocb->ki_pos >= zi->i_max_size) | |
826 | return 0; | |
827 | ||
828 | if (iocb->ki_flags & IOCB_NOWAIT) { | |
829 | if (!inode_trylock_shared(inode)) | |
830 | return -EAGAIN; | |
831 | } else { | |
832 | inode_lock_shared(inode); | |
833 | } | |
834 | ||
835 | /* Limit read operations to written data */ | |
836 | mutex_lock(&zi->i_truncate_mutex); | |
837 | isize = i_size_read(inode); | |
838 | if (iocb->ki_pos >= isize) { | |
839 | mutex_unlock(&zi->i_truncate_mutex); | |
840 | ret = 0; | |
841 | goto inode_unlock; | |
842 | } | |
843 | iov_iter_truncate(to, isize - iocb->ki_pos); | |
844 | mutex_unlock(&zi->i_truncate_mutex); | |
845 | ||
846 | if (iocb->ki_flags & IOCB_DIRECT) { | |
847 | size_t count = iov_iter_count(to); | |
848 | ||
849 | if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) { | |
850 | ret = -EINVAL; | |
851 | goto inode_unlock; | |
852 | } | |
853 | file_accessed(iocb->ki_filp); | |
854 | ret = iomap_dio_rw(iocb, to, &zonefs_iomap_ops, | |
855 | &zonefs_read_dio_ops, is_sync_kiocb(iocb)); | |
856 | } else { | |
857 | ret = generic_file_read_iter(iocb, to); | |
858 | if (ret == -EIO) | |
859 | zonefs_io_error(inode, false); | |
860 | } | |
861 | ||
862 | inode_unlock: | |
863 | inode_unlock_shared(inode); | |
864 | ||
865 | return ret; | |
866 | } | |
867 | ||
868 | static const struct file_operations zonefs_file_operations = { | |
869 | .open = generic_file_open, | |
870 | .fsync = zonefs_file_fsync, | |
871 | .mmap = zonefs_file_mmap, | |
872 | .llseek = zonefs_file_llseek, | |
873 | .read_iter = zonefs_file_read_iter, | |
874 | .write_iter = zonefs_file_write_iter, | |
875 | .splice_read = generic_file_splice_read, | |
876 | .splice_write = iter_file_splice_write, | |
877 | .iopoll = iomap_dio_iopoll, | |
878 | }; | |
879 | ||
880 | static struct kmem_cache *zonefs_inode_cachep; | |
881 | ||
882 | static struct inode *zonefs_alloc_inode(struct super_block *sb) | |
883 | { | |
884 | struct zonefs_inode_info *zi; | |
885 | ||
886 | zi = kmem_cache_alloc(zonefs_inode_cachep, GFP_KERNEL); | |
887 | if (!zi) | |
888 | return NULL; | |
889 | ||
890 | inode_init_once(&zi->i_vnode); | |
891 | mutex_init(&zi->i_truncate_mutex); | |
892 | init_rwsem(&zi->i_mmap_sem); | |
893 | ||
894 | return &zi->i_vnode; | |
895 | } | |
896 | ||
897 | static void zonefs_free_inode(struct inode *inode) | |
898 | { | |
899 | kmem_cache_free(zonefs_inode_cachep, ZONEFS_I(inode)); | |
900 | } | |
901 | ||
902 | /* | |
903 | * File system stat. | |
904 | */ | |
905 | static int zonefs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
906 | { | |
907 | struct super_block *sb = dentry->d_sb; | |
908 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
909 | enum zonefs_ztype t; | |
910 | u64 fsid; | |
911 | ||
912 | buf->f_type = ZONEFS_MAGIC; | |
913 | buf->f_bsize = sb->s_blocksize; | |
914 | buf->f_namelen = ZONEFS_NAME_MAX; | |
915 | ||
916 | spin_lock(&sbi->s_lock); | |
917 | ||
918 | buf->f_blocks = sbi->s_blocks; | |
919 | if (WARN_ON(sbi->s_used_blocks > sbi->s_blocks)) | |
920 | buf->f_bfree = 0; | |
921 | else | |
922 | buf->f_bfree = buf->f_blocks - sbi->s_used_blocks; | |
923 | buf->f_bavail = buf->f_bfree; | |
924 | ||
925 | for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) { | |
926 | if (sbi->s_nr_files[t]) | |
927 | buf->f_files += sbi->s_nr_files[t] + 1; | |
928 | } | |
929 | buf->f_ffree = 0; | |
930 | ||
931 | spin_unlock(&sbi->s_lock); | |
932 | ||
933 | fsid = le64_to_cpup((void *)sbi->s_uuid.b) ^ | |
934 | le64_to_cpup((void *)sbi->s_uuid.b + sizeof(u64)); | |
935 | buf->f_fsid.val[0] = (u32)fsid; | |
936 | buf->f_fsid.val[1] = (u32)(fsid >> 32); | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
941 | enum { | |
942 | Opt_errors_ro, Opt_errors_zro, Opt_errors_zol, Opt_errors_repair, | |
943 | Opt_err, | |
944 | }; | |
945 | ||
946 | static const match_table_t tokens = { | |
947 | { Opt_errors_ro, "errors=remount-ro"}, | |
948 | { Opt_errors_zro, "errors=zone-ro"}, | |
949 | { Opt_errors_zol, "errors=zone-offline"}, | |
950 | { Opt_errors_repair, "errors=repair"}, | |
951 | { Opt_err, NULL} | |
952 | }; | |
953 | ||
954 | static int zonefs_parse_options(struct super_block *sb, char *options) | |
955 | { | |
956 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
957 | substring_t args[MAX_OPT_ARGS]; | |
958 | char *p; | |
959 | ||
960 | if (!options) | |
961 | return 0; | |
962 | ||
963 | while ((p = strsep(&options, ",")) != NULL) { | |
964 | int token; | |
965 | ||
966 | if (!*p) | |
967 | continue; | |
968 | ||
969 | token = match_token(p, tokens, args); | |
970 | switch (token) { | |
971 | case Opt_errors_ro: | |
972 | sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; | |
973 | sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_RO; | |
974 | break; | |
975 | case Opt_errors_zro: | |
976 | sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; | |
977 | sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZRO; | |
978 | break; | |
979 | case Opt_errors_zol: | |
980 | sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; | |
981 | sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZOL; | |
982 | break; | |
983 | case Opt_errors_repair: | |
984 | sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; | |
985 | sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_REPAIR; | |
986 | break; | |
987 | default: | |
988 | return -EINVAL; | |
989 | } | |
990 | } | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | static int zonefs_show_options(struct seq_file *seq, struct dentry *root) | |
996 | { | |
997 | struct zonefs_sb_info *sbi = ZONEFS_SB(root->d_sb); | |
998 | ||
999 | if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO) | |
1000 | seq_puts(seq, ",errors=remount-ro"); | |
1001 | if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO) | |
1002 | seq_puts(seq, ",errors=zone-ro"); | |
1003 | if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL) | |
1004 | seq_puts(seq, ",errors=zone-offline"); | |
1005 | if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_REPAIR) | |
1006 | seq_puts(seq, ",errors=repair"); | |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | static int zonefs_remount(struct super_block *sb, int *flags, char *data) | |
1012 | { | |
1013 | sync_filesystem(sb); | |
1014 | ||
1015 | return zonefs_parse_options(sb, data); | |
1016 | } | |
1017 | ||
1018 | static const struct super_operations zonefs_sops = { | |
1019 | .alloc_inode = zonefs_alloc_inode, | |
1020 | .free_inode = zonefs_free_inode, | |
1021 | .statfs = zonefs_statfs, | |
1022 | .remount_fs = zonefs_remount, | |
1023 | .show_options = zonefs_show_options, | |
1024 | }; | |
1025 | ||
1026 | static const struct inode_operations zonefs_dir_inode_operations = { | |
1027 | .lookup = simple_lookup, | |
1028 | .setattr = zonefs_inode_setattr, | |
1029 | }; | |
1030 | ||
1031 | static void zonefs_init_dir_inode(struct inode *parent, struct inode *inode, | |
1032 | enum zonefs_ztype type) | |
1033 | { | |
1034 | struct super_block *sb = parent->i_sb; | |
1035 | ||
1036 | inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk) + type + 1; | |
1037 | inode_init_owner(inode, parent, S_IFDIR | 0555); | |
1038 | inode->i_op = &zonefs_dir_inode_operations; | |
1039 | inode->i_fop = &simple_dir_operations; | |
1040 | set_nlink(inode, 2); | |
1041 | inc_nlink(parent); | |
1042 | } | |
1043 | ||
1044 | static void zonefs_init_file_inode(struct inode *inode, struct blk_zone *zone, | |
1045 | enum zonefs_ztype type) | |
1046 | { | |
1047 | struct super_block *sb = inode->i_sb; | |
1048 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
1049 | struct zonefs_inode_info *zi = ZONEFS_I(inode); | |
1050 | ||
1051 | inode->i_ino = zone->start >> sbi->s_zone_sectors_shift; | |
1052 | inode->i_mode = S_IFREG | sbi->s_perm; | |
1053 | ||
1054 | zi->i_ztype = type; | |
1055 | zi->i_zsector = zone->start; | |
e3c3155b JT |
1056 | zi->i_zone_size = zone->len << SECTOR_SHIFT; |
1057 | ||
8dcc1a9d | 1058 | zi->i_max_size = min_t(loff_t, MAX_LFS_FILESIZE, |
e3c3155b | 1059 | zone->capacity << SECTOR_SHIFT); |
ccf4ad7d | 1060 | zi->i_wpoffset = zonefs_check_zone_condition(inode, zone, true, true); |
8dcc1a9d DLM |
1061 | |
1062 | inode->i_uid = sbi->s_uid; | |
1063 | inode->i_gid = sbi->s_gid; | |
1064 | inode->i_size = zi->i_wpoffset; | |
e3c3155b | 1065 | inode->i_blocks = zi->i_max_size >> SECTOR_SHIFT; |
8dcc1a9d DLM |
1066 | |
1067 | inode->i_op = &zonefs_file_inode_operations; | |
1068 | inode->i_fop = &zonefs_file_operations; | |
1069 | inode->i_mapping->a_ops = &zonefs_file_aops; | |
1070 | ||
1071 | sb->s_maxbytes = max(zi->i_max_size, sb->s_maxbytes); | |
1072 | sbi->s_blocks += zi->i_max_size >> sb->s_blocksize_bits; | |
1073 | sbi->s_used_blocks += zi->i_wpoffset >> sb->s_blocksize_bits; | |
1074 | } | |
1075 | ||
1076 | static struct dentry *zonefs_create_inode(struct dentry *parent, | |
1077 | const char *name, struct blk_zone *zone, | |
1078 | enum zonefs_ztype type) | |
1079 | { | |
1080 | struct inode *dir = d_inode(parent); | |
1081 | struct dentry *dentry; | |
1082 | struct inode *inode; | |
1083 | ||
1084 | dentry = d_alloc_name(parent, name); | |
1085 | if (!dentry) | |
1086 | return NULL; | |
1087 | ||
1088 | inode = new_inode(parent->d_sb); | |
1089 | if (!inode) | |
1090 | goto dput; | |
1091 | ||
1092 | inode->i_ctime = inode->i_mtime = inode->i_atime = dir->i_ctime; | |
1093 | if (zone) | |
1094 | zonefs_init_file_inode(inode, zone, type); | |
1095 | else | |
1096 | zonefs_init_dir_inode(dir, inode, type); | |
1097 | d_add(dentry, inode); | |
1098 | dir->i_size++; | |
1099 | ||
1100 | return dentry; | |
1101 | ||
1102 | dput: | |
1103 | dput(dentry); | |
1104 | ||
1105 | return NULL; | |
1106 | } | |
1107 | ||
1108 | struct zonefs_zone_data { | |
1109 | struct super_block *sb; | |
1110 | unsigned int nr_zones[ZONEFS_ZTYPE_MAX]; | |
1111 | struct blk_zone *zones; | |
1112 | }; | |
1113 | ||
1114 | /* | |
1115 | * Create a zone group and populate it with zone files. | |
1116 | */ | |
1117 | static int zonefs_create_zgroup(struct zonefs_zone_data *zd, | |
1118 | enum zonefs_ztype type) | |
1119 | { | |
1120 | struct super_block *sb = zd->sb; | |
1121 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
1122 | struct blk_zone *zone, *next, *end; | |
1123 | const char *zgroup_name; | |
1124 | char *file_name; | |
1125 | struct dentry *dir; | |
1126 | unsigned int n = 0; | |
01b2651c | 1127 | int ret; |
8dcc1a9d DLM |
1128 | |
1129 | /* If the group is empty, there is nothing to do */ | |
1130 | if (!zd->nr_zones[type]) | |
1131 | return 0; | |
1132 | ||
1133 | file_name = kmalloc(ZONEFS_NAME_MAX, GFP_KERNEL); | |
1134 | if (!file_name) | |
1135 | return -ENOMEM; | |
1136 | ||
1137 | if (type == ZONEFS_ZTYPE_CNV) | |
1138 | zgroup_name = "cnv"; | |
1139 | else | |
1140 | zgroup_name = "seq"; | |
1141 | ||
1142 | dir = zonefs_create_inode(sb->s_root, zgroup_name, NULL, type); | |
01b2651c DLM |
1143 | if (!dir) { |
1144 | ret = -ENOMEM; | |
8dcc1a9d | 1145 | goto free; |
01b2651c | 1146 | } |
8dcc1a9d DLM |
1147 | |
1148 | /* | |
1149 | * The first zone contains the super block: skip it. | |
1150 | */ | |
1151 | end = zd->zones + blkdev_nr_zones(sb->s_bdev->bd_disk); | |
1152 | for (zone = &zd->zones[1]; zone < end; zone = next) { | |
1153 | ||
1154 | next = zone + 1; | |
1155 | if (zonefs_zone_type(zone) != type) | |
1156 | continue; | |
1157 | ||
1158 | /* | |
1159 | * For conventional zones, contiguous zones can be aggregated | |
1160 | * together to form larger files. Note that this overwrites the | |
1161 | * length of the first zone of the set of contiguous zones | |
1162 | * aggregated together. If one offline or read-only zone is | |
1163 | * found, assume that all zones aggregated have the same | |
1164 | * condition. | |
1165 | */ | |
1166 | if (type == ZONEFS_ZTYPE_CNV && | |
1167 | (sbi->s_features & ZONEFS_F_AGGRCNV)) { | |
1168 | for (; next < end; next++) { | |
1169 | if (zonefs_zone_type(next) != type) | |
1170 | break; | |
1171 | zone->len += next->len; | |
e3c3155b | 1172 | zone->capacity += next->capacity; |
8dcc1a9d DLM |
1173 | if (next->cond == BLK_ZONE_COND_READONLY && |
1174 | zone->cond != BLK_ZONE_COND_OFFLINE) | |
1175 | zone->cond = BLK_ZONE_COND_READONLY; | |
1176 | else if (next->cond == BLK_ZONE_COND_OFFLINE) | |
1177 | zone->cond = BLK_ZONE_COND_OFFLINE; | |
1178 | } | |
e3c3155b JT |
1179 | if (zone->capacity != zone->len) { |
1180 | zonefs_err(sb, "Invalid conventional zone capacity\n"); | |
1181 | ret = -EINVAL; | |
1182 | goto free; | |
1183 | } | |
8dcc1a9d DLM |
1184 | } |
1185 | ||
1186 | /* | |
1187 | * Use the file number within its group as file name. | |
1188 | */ | |
1189 | snprintf(file_name, ZONEFS_NAME_MAX - 1, "%u", n); | |
01b2651c DLM |
1190 | if (!zonefs_create_inode(dir, file_name, zone, type)) { |
1191 | ret = -ENOMEM; | |
8dcc1a9d | 1192 | goto free; |
01b2651c | 1193 | } |
8dcc1a9d DLM |
1194 | |
1195 | n++; | |
1196 | } | |
1197 | ||
1198 | zonefs_info(sb, "Zone group \"%s\" has %u file%s\n", | |
1199 | zgroup_name, n, n > 1 ? "s" : ""); | |
1200 | ||
1201 | sbi->s_nr_files[type] = n; | |
1202 | ret = 0; | |
1203 | ||
1204 | free: | |
1205 | kfree(file_name); | |
1206 | ||
1207 | return ret; | |
1208 | } | |
1209 | ||
1210 | static int zonefs_get_zone_info_cb(struct blk_zone *zone, unsigned int idx, | |
1211 | void *data) | |
1212 | { | |
1213 | struct zonefs_zone_data *zd = data; | |
1214 | ||
1215 | /* | |
1216 | * Count the number of usable zones: the first zone at index 0 contains | |
1217 | * the super block and is ignored. | |
1218 | */ | |
1219 | switch (zone->type) { | |
1220 | case BLK_ZONE_TYPE_CONVENTIONAL: | |
1221 | zone->wp = zone->start + zone->len; | |
1222 | if (idx) | |
1223 | zd->nr_zones[ZONEFS_ZTYPE_CNV]++; | |
1224 | break; | |
1225 | case BLK_ZONE_TYPE_SEQWRITE_REQ: | |
1226 | case BLK_ZONE_TYPE_SEQWRITE_PREF: | |
1227 | if (idx) | |
1228 | zd->nr_zones[ZONEFS_ZTYPE_SEQ]++; | |
1229 | break; | |
1230 | default: | |
1231 | zonefs_err(zd->sb, "Unsupported zone type 0x%x\n", | |
1232 | zone->type); | |
1233 | return -EIO; | |
1234 | } | |
1235 | ||
1236 | memcpy(&zd->zones[idx], zone, sizeof(struct blk_zone)); | |
1237 | ||
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | static int zonefs_get_zone_info(struct zonefs_zone_data *zd) | |
1242 | { | |
1243 | struct block_device *bdev = zd->sb->s_bdev; | |
1244 | int ret; | |
1245 | ||
1246 | zd->zones = kvcalloc(blkdev_nr_zones(bdev->bd_disk), | |
1247 | sizeof(struct blk_zone), GFP_KERNEL); | |
1248 | if (!zd->zones) | |
1249 | return -ENOMEM; | |
1250 | ||
1251 | /* Get zones information from the device */ | |
1252 | ret = blkdev_report_zones(bdev, 0, BLK_ALL_ZONES, | |
1253 | zonefs_get_zone_info_cb, zd); | |
1254 | if (ret < 0) { | |
1255 | zonefs_err(zd->sb, "Zone report failed %d\n", ret); | |
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | if (ret != blkdev_nr_zones(bdev->bd_disk)) { | |
1260 | zonefs_err(zd->sb, "Invalid zone report (%d/%u zones)\n", | |
1261 | ret, blkdev_nr_zones(bdev->bd_disk)); | |
1262 | return -EIO; | |
1263 | } | |
1264 | ||
1265 | return 0; | |
1266 | } | |
1267 | ||
1268 | static inline void zonefs_cleanup_zone_info(struct zonefs_zone_data *zd) | |
1269 | { | |
1270 | kvfree(zd->zones); | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Read super block information from the device. | |
1275 | */ | |
1276 | static int zonefs_read_super(struct super_block *sb) | |
1277 | { | |
1278 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
1279 | struct zonefs_super *super; | |
1280 | u32 crc, stored_crc; | |
1281 | struct page *page; | |
1282 | struct bio_vec bio_vec; | |
1283 | struct bio bio; | |
1284 | int ret; | |
1285 | ||
1286 | page = alloc_page(GFP_KERNEL); | |
1287 | if (!page) | |
1288 | return -ENOMEM; | |
1289 | ||
1290 | bio_init(&bio, &bio_vec, 1); | |
1291 | bio.bi_iter.bi_sector = 0; | |
1292 | bio.bi_opf = REQ_OP_READ; | |
1293 | bio_set_dev(&bio, sb->s_bdev); | |
1294 | bio_add_page(&bio, page, PAGE_SIZE, 0); | |
1295 | ||
1296 | ret = submit_bio_wait(&bio); | |
1297 | if (ret) | |
1298 | goto free_page; | |
1299 | ||
1300 | super = kmap(page); | |
1301 | ||
1302 | ret = -EINVAL; | |
1303 | if (le32_to_cpu(super->s_magic) != ZONEFS_MAGIC) | |
1304 | goto unmap; | |
1305 | ||
1306 | stored_crc = le32_to_cpu(super->s_crc); | |
1307 | super->s_crc = 0; | |
1308 | crc = crc32(~0U, (unsigned char *)super, sizeof(struct zonefs_super)); | |
1309 | if (crc != stored_crc) { | |
1310 | zonefs_err(sb, "Invalid checksum (Expected 0x%08x, got 0x%08x)", | |
1311 | crc, stored_crc); | |
1312 | goto unmap; | |
1313 | } | |
1314 | ||
1315 | sbi->s_features = le64_to_cpu(super->s_features); | |
1316 | if (sbi->s_features & ~ZONEFS_F_DEFINED_FEATURES) { | |
1317 | zonefs_err(sb, "Unknown features set 0x%llx\n", | |
1318 | sbi->s_features); | |
1319 | goto unmap; | |
1320 | } | |
1321 | ||
1322 | if (sbi->s_features & ZONEFS_F_UID) { | |
1323 | sbi->s_uid = make_kuid(current_user_ns(), | |
1324 | le32_to_cpu(super->s_uid)); | |
1325 | if (!uid_valid(sbi->s_uid)) { | |
1326 | zonefs_err(sb, "Invalid UID feature\n"); | |
1327 | goto unmap; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | if (sbi->s_features & ZONEFS_F_GID) { | |
1332 | sbi->s_gid = make_kgid(current_user_ns(), | |
1333 | le32_to_cpu(super->s_gid)); | |
1334 | if (!gid_valid(sbi->s_gid)) { | |
1335 | zonefs_err(sb, "Invalid GID feature\n"); | |
1336 | goto unmap; | |
1337 | } | |
1338 | } | |
1339 | ||
1340 | if (sbi->s_features & ZONEFS_F_PERM) | |
1341 | sbi->s_perm = le32_to_cpu(super->s_perm); | |
1342 | ||
1343 | if (memchr_inv(super->s_reserved, 0, sizeof(super->s_reserved))) { | |
1344 | zonefs_err(sb, "Reserved area is being used\n"); | |
1345 | goto unmap; | |
1346 | } | |
1347 | ||
568776f9 | 1348 | import_uuid(&sbi->s_uuid, super->s_uuid); |
8dcc1a9d DLM |
1349 | ret = 0; |
1350 | ||
1351 | unmap: | |
1352 | kunmap(page); | |
1353 | free_page: | |
1354 | __free_page(page); | |
1355 | ||
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * Check that the device is zoned. If it is, get the list of zones and create | |
1361 | * sub-directories and files according to the device zone configuration and | |
1362 | * format options. | |
1363 | */ | |
1364 | static int zonefs_fill_super(struct super_block *sb, void *data, int silent) | |
1365 | { | |
1366 | struct zonefs_zone_data zd; | |
1367 | struct zonefs_sb_info *sbi; | |
1368 | struct inode *inode; | |
1369 | enum zonefs_ztype t; | |
1370 | int ret; | |
1371 | ||
1372 | if (!bdev_is_zoned(sb->s_bdev)) { | |
1373 | zonefs_err(sb, "Not a zoned block device\n"); | |
1374 | return -EINVAL; | |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * Initialize super block information: the maximum file size is updated | |
1379 | * when the zone files are created so that the format option | |
1380 | * ZONEFS_F_AGGRCNV which increases the maximum file size of a file | |
1381 | * beyond the zone size is taken into account. | |
1382 | */ | |
1383 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1384 | if (!sbi) | |
1385 | return -ENOMEM; | |
1386 | ||
1387 | spin_lock_init(&sbi->s_lock); | |
1388 | sb->s_fs_info = sbi; | |
1389 | sb->s_magic = ZONEFS_MAGIC; | |
1390 | sb->s_maxbytes = 0; | |
1391 | sb->s_op = &zonefs_sops; | |
1392 | sb->s_time_gran = 1; | |
1393 | ||
1394 | /* | |
1395 | * The block size is set to the device physical sector size to ensure | |
1396 | * that write operations on 512e devices (512B logical block and 4KB | |
1397 | * physical block) are always aligned to the device physical blocks, | |
1398 | * as mandated by the ZBC/ZAC specifications. | |
1399 | */ | |
1400 | sb_set_blocksize(sb, bdev_physical_block_size(sb->s_bdev)); | |
1401 | sbi->s_zone_sectors_shift = ilog2(bdev_zone_sectors(sb->s_bdev)); | |
1402 | sbi->s_uid = GLOBAL_ROOT_UID; | |
1403 | sbi->s_gid = GLOBAL_ROOT_GID; | |
1404 | sbi->s_perm = 0640; | |
1405 | sbi->s_mount_opts = ZONEFS_MNTOPT_ERRORS_RO; | |
1406 | ||
1407 | ret = zonefs_read_super(sb); | |
1408 | if (ret) | |
1409 | return ret; | |
1410 | ||
1411 | ret = zonefs_parse_options(sb, data); | |
1412 | if (ret) | |
1413 | return ret; | |
1414 | ||
1415 | memset(&zd, 0, sizeof(struct zonefs_zone_data)); | |
1416 | zd.sb = sb; | |
1417 | ret = zonefs_get_zone_info(&zd); | |
1418 | if (ret) | |
1419 | goto cleanup; | |
1420 | ||
1421 | zonefs_info(sb, "Mounting %u zones", | |
1422 | blkdev_nr_zones(sb->s_bdev->bd_disk)); | |
1423 | ||
1424 | /* Create root directory inode */ | |
1425 | ret = -ENOMEM; | |
1426 | inode = new_inode(sb); | |
1427 | if (!inode) | |
1428 | goto cleanup; | |
1429 | ||
1430 | inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk); | |
1431 | inode->i_mode = S_IFDIR | 0555; | |
1432 | inode->i_ctime = inode->i_mtime = inode->i_atime = current_time(inode); | |
1433 | inode->i_op = &zonefs_dir_inode_operations; | |
1434 | inode->i_fop = &simple_dir_operations; | |
1435 | set_nlink(inode, 2); | |
1436 | ||
1437 | sb->s_root = d_make_root(inode); | |
1438 | if (!sb->s_root) | |
1439 | goto cleanup; | |
1440 | ||
1441 | /* Create and populate files in zone groups directories */ | |
1442 | for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) { | |
1443 | ret = zonefs_create_zgroup(&zd, t); | |
1444 | if (ret) | |
1445 | break; | |
1446 | } | |
1447 | ||
1448 | cleanup: | |
1449 | zonefs_cleanup_zone_info(&zd); | |
1450 | ||
1451 | return ret; | |
1452 | } | |
1453 | ||
1454 | static struct dentry *zonefs_mount(struct file_system_type *fs_type, | |
1455 | int flags, const char *dev_name, void *data) | |
1456 | { | |
1457 | return mount_bdev(fs_type, flags, dev_name, data, zonefs_fill_super); | |
1458 | } | |
1459 | ||
1460 | static void zonefs_kill_super(struct super_block *sb) | |
1461 | { | |
1462 | struct zonefs_sb_info *sbi = ZONEFS_SB(sb); | |
1463 | ||
1464 | if (sb->s_root) | |
1465 | d_genocide(sb->s_root); | |
1466 | kill_block_super(sb); | |
1467 | kfree(sbi); | |
1468 | } | |
1469 | ||
1470 | /* | |
1471 | * File system definition and registration. | |
1472 | */ | |
1473 | static struct file_system_type zonefs_type = { | |
1474 | .owner = THIS_MODULE, | |
1475 | .name = "zonefs", | |
1476 | .mount = zonefs_mount, | |
1477 | .kill_sb = zonefs_kill_super, | |
1478 | .fs_flags = FS_REQUIRES_DEV, | |
1479 | }; | |
1480 | ||
1481 | static int __init zonefs_init_inodecache(void) | |
1482 | { | |
1483 | zonefs_inode_cachep = kmem_cache_create("zonefs_inode_cache", | |
1484 | sizeof(struct zonefs_inode_info), 0, | |
1485 | (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), | |
1486 | NULL); | |
1487 | if (zonefs_inode_cachep == NULL) | |
1488 | return -ENOMEM; | |
1489 | return 0; | |
1490 | } | |
1491 | ||
1492 | static void zonefs_destroy_inodecache(void) | |
1493 | { | |
1494 | /* | |
1495 | * Make sure all delayed rcu free inodes are flushed before we | |
1496 | * destroy the inode cache. | |
1497 | */ | |
1498 | rcu_barrier(); | |
1499 | kmem_cache_destroy(zonefs_inode_cachep); | |
1500 | } | |
1501 | ||
1502 | static int __init zonefs_init(void) | |
1503 | { | |
1504 | int ret; | |
1505 | ||
1506 | BUILD_BUG_ON(sizeof(struct zonefs_super) != ZONEFS_SUPER_SIZE); | |
1507 | ||
1508 | ret = zonefs_init_inodecache(); | |
1509 | if (ret) | |
1510 | return ret; | |
1511 | ||
1512 | ret = register_filesystem(&zonefs_type); | |
1513 | if (ret) { | |
1514 | zonefs_destroy_inodecache(); | |
1515 | return ret; | |
1516 | } | |
1517 | ||
1518 | return 0; | |
1519 | } | |
1520 | ||
1521 | static void __exit zonefs_exit(void) | |
1522 | { | |
1523 | zonefs_destroy_inodecache(); | |
1524 | unregister_filesystem(&zonefs_type); | |
1525 | } | |
1526 | ||
1527 | MODULE_AUTHOR("Damien Le Moal"); | |
1528 | MODULE_DESCRIPTION("Zone file system for zoned block devices"); | |
1529 | MODULE_LICENSE("GPL"); | |
1530 | module_init(zonefs_init); | |
1531 | module_exit(zonefs_exit); |