2268 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <linux/ceph/ceph_debug.h>3 4#include <linux/spinlock.h>5#include <linux/namei.h>6#include <linux/slab.h>7#include <linux/sched.h>8#include <linux/xattr.h>9 10#include "super.h"11#include "mds_client.h"12#include "crypto.h"13 14/*15 * Directory operations: readdir, lookup, create, link, unlink,16 * rename, etc.17 */18 19/*20 * Ceph MDS operations are specified in terms of a base ino and21 * relative path. Thus, the client can specify an operation on a22 * specific inode (e.g., a getattr due to fstat(2)), or as a path23 * relative to, say, the root directory.24 *25 * Normally, we limit ourselves to strict inode ops (no path component)26 * or dentry operations (a single path component relative to an ino). The27 * exception to this is open_root_dentry(), which will open the mount28 * point by name.29 */30 31const struct dentry_operations ceph_dentry_ops;32 33static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);34static int __dir_lease_try_check(const struct dentry *dentry);35 36/*37 * Initialize ceph dentry state.38 */39static int ceph_d_init(struct dentry *dentry)40{41 struct ceph_dentry_info *di;42 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb);43 44 di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);45 if (!di)46 return -ENOMEM; /* oh well */47 48 di->dentry = dentry;49 di->lease_session = NULL;50 di->time = jiffies;51 dentry->d_fsdata = di;52 INIT_LIST_HEAD(&di->lease_list);53 54 atomic64_inc(&mdsc->metric.total_dentries);55 56 return 0;57}58 59/*60 * for f_pos for readdir:61 * - hash order:62 * (0xff << 52) | ((24 bits hash) << 28) |63 * (the nth entry has hash collision);64 * - frag+name order;65 * ((frag value) << 28) | (the nth entry in frag);66 */67#define OFFSET_BITS 2868#define OFFSET_MASK ((1 << OFFSET_BITS) - 1)69#define HASH_ORDER (0xffull << (OFFSET_BITS + 24))70loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)71{72 loff_t fpos = ((loff_t)high << 28) | (loff_t)off;73 if (hash_order)74 fpos |= HASH_ORDER;75 return fpos;76}77 78static bool is_hash_order(loff_t p)79{80 return (p & HASH_ORDER) == HASH_ORDER;81}82 83static unsigned fpos_frag(loff_t p)84{85 return p >> OFFSET_BITS;86}87 88static unsigned fpos_hash(loff_t p)89{90 return ceph_frag_value(fpos_frag(p));91}92 93static unsigned fpos_off(loff_t p)94{95 return p & OFFSET_MASK;96}97 98static int fpos_cmp(loff_t l, loff_t r)99{100 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));101 if (v)102 return v;103 return (int)(fpos_off(l) - fpos_off(r));104}105 106/*107 * make note of the last dentry we read, so we can108 * continue at the same lexicographical point,109 * regardless of what dir changes take place on the110 * server.111 */112static int note_last_dentry(struct ceph_fs_client *fsc,113 struct ceph_dir_file_info *dfi,114 const char *name,115 int len, unsigned next_offset)116{117 char *buf = kmalloc(len+1, GFP_KERNEL);118 if (!buf)119 return -ENOMEM;120 kfree(dfi->last_name);121 dfi->last_name = buf;122 memcpy(dfi->last_name, name, len);123 dfi->last_name[len] = 0;124 dfi->next_offset = next_offset;125 doutc(fsc->client, "'%s'\n", dfi->last_name);126 return 0;127}128 129 130static struct dentry *131__dcache_find_get_entry(struct dentry *parent, u64 idx,132 struct ceph_readdir_cache_control *cache_ctl)133{134 struct inode *dir = d_inode(parent);135 struct ceph_client *cl = ceph_inode_to_client(dir);136 struct dentry *dentry;137 unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;138 loff_t ptr_pos = idx * sizeof(struct dentry *);139 pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;140 141 if (ptr_pos >= i_size_read(dir))142 return NULL;143 144 if (!cache_ctl->page || ptr_pgoff != cache_ctl->page->index) {145 ceph_readdir_cache_release(cache_ctl);146 cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);147 if (!cache_ctl->page) {148 doutc(cl, " page %lu not found\n", ptr_pgoff);149 return ERR_PTR(-EAGAIN);150 }151 /* reading/filling the cache are serialized by152 i_rwsem, no need to use page lock */153 unlock_page(cache_ctl->page);154 cache_ctl->dentries = kmap(cache_ctl->page);155 }156 157 cache_ctl->index = idx & idx_mask;158 159 rcu_read_lock();160 spin_lock(&parent->d_lock);161 /* check i_size again here, because empty directory can be162 * marked as complete while not holding the i_rwsem. */163 if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))164 dentry = cache_ctl->dentries[cache_ctl->index];165 else166 dentry = NULL;167 spin_unlock(&parent->d_lock);168 if (dentry && !lockref_get_not_dead(&dentry->d_lockref))169 dentry = NULL;170 rcu_read_unlock();171 return dentry ? : ERR_PTR(-EAGAIN);172}173 174/*175 * When possible, we try to satisfy a readdir by peeking at the176 * dcache. We make this work by carefully ordering dentries on177 * d_children when we initially get results back from the MDS, and178 * falling back to a "normal" sync readdir if any dentries in the dir179 * are dropped.180 *181 * Complete dir indicates that we have all dentries in the dir. It is182 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by183 * the MDS if/when the directory is modified).184 */185static int __dcache_readdir(struct file *file, struct dir_context *ctx,186 int shared_gen)187{188 struct ceph_dir_file_info *dfi = file->private_data;189 struct dentry *parent = file->f_path.dentry;190 struct inode *dir = d_inode(parent);191 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(dir);192 struct ceph_client *cl = ceph_inode_to_client(dir);193 struct dentry *dentry, *last = NULL;194 struct ceph_dentry_info *di;195 struct ceph_readdir_cache_control cache_ctl = {};196 u64 idx = 0;197 int err = 0;198 199 doutc(cl, "%p %llx.%llx v%u at %llx\n", dir, ceph_vinop(dir),200 (unsigned)shared_gen, ctx->pos);201 202 /* search start position */203 if (ctx->pos > 2) {204 u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));205 while (count > 0) {206 u64 step = count >> 1;207 dentry = __dcache_find_get_entry(parent, idx + step,208 &cache_ctl);209 if (!dentry) {210 /* use linar search */211 idx = 0;212 break;213 }214 if (IS_ERR(dentry)) {215 err = PTR_ERR(dentry);216 goto out;217 }218 di = ceph_dentry(dentry);219 spin_lock(&dentry->d_lock);220 if (fpos_cmp(di->offset, ctx->pos) < 0) {221 idx += step + 1;222 count -= step + 1;223 } else {224 count = step;225 }226 spin_unlock(&dentry->d_lock);227 dput(dentry);228 }229 230 doutc(cl, "%p %llx.%llx cache idx %llu\n", dir,231 ceph_vinop(dir), idx);232 }233 234 235 for (;;) {236 bool emit_dentry = false;237 dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);238 if (!dentry) {239 dfi->file_info.flags |= CEPH_F_ATEND;240 err = 0;241 break;242 }243 if (IS_ERR(dentry)) {244 err = PTR_ERR(dentry);245 goto out;246 }247 248 spin_lock(&dentry->d_lock);249 di = ceph_dentry(dentry);250 if (d_unhashed(dentry) ||251 d_really_is_negative(dentry) ||252 di->lease_shared_gen != shared_gen ||253 ((dentry->d_flags & DCACHE_NOKEY_NAME) &&254 fscrypt_has_encryption_key(dir))) {255 spin_unlock(&dentry->d_lock);256 dput(dentry);257 err = -EAGAIN;258 goto out;259 }260 if (fpos_cmp(ctx->pos, di->offset) <= 0) {261 __ceph_dentry_dir_lease_touch(di);262 emit_dentry = true;263 }264 spin_unlock(&dentry->d_lock);265 266 if (emit_dentry) {267 doutc(cl, " %llx dentry %p %pd %p\n", di->offset,268 dentry, dentry, d_inode(dentry));269 ctx->pos = di->offset;270 if (!dir_emit(ctx, dentry->d_name.name,271 dentry->d_name.len, ceph_present_inode(d_inode(dentry)),272 d_inode(dentry)->i_mode >> 12)) {273 dput(dentry);274 err = 0;275 break;276 }277 ctx->pos++;278 279 if (last)280 dput(last);281 last = dentry;282 } else {283 dput(dentry);284 }285 }286out:287 ceph_readdir_cache_release(&cache_ctl);288 if (last) {289 int ret;290 di = ceph_dentry(last);291 ret = note_last_dentry(fsc, dfi, last->d_name.name,292 last->d_name.len,293 fpos_off(di->offset) + 1);294 if (ret < 0)295 err = ret;296 dput(last);297 /* last_name no longer match cache index */298 if (dfi->readdir_cache_idx >= 0) {299 dfi->readdir_cache_idx = -1;300 dfi->dir_release_count = 0;301 }302 }303 return err;304}305 306static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos)307{308 if (!dfi->last_readdir)309 return true;310 if (is_hash_order(pos))311 return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos));312 else313 return dfi->frag != fpos_frag(pos);314}315 316static int ceph_readdir(struct file *file, struct dir_context *ctx)317{318 struct ceph_dir_file_info *dfi = file->private_data;319 struct inode *inode = file_inode(file);320 struct ceph_inode_info *ci = ceph_inode(inode);321 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);322 struct ceph_mds_client *mdsc = fsc->mdsc;323 struct ceph_client *cl = fsc->client;324 int i;325 int err;326 unsigned frag = -1;327 struct ceph_mds_reply_info_parsed *rinfo;328 329 doutc(cl, "%p %llx.%llx file %p pos %llx\n", inode,330 ceph_vinop(inode), file, ctx->pos);331 if (dfi->file_info.flags & CEPH_F_ATEND)332 return 0;333 334 /* always start with . and .. */335 if (ctx->pos == 0) {336 doutc(cl, "%p %llx.%llx off 0 -> '.'\n", inode,337 ceph_vinop(inode));338 if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode),339 inode->i_mode >> 12))340 return 0;341 ctx->pos = 1;342 }343 if (ctx->pos == 1) {344 u64 ino;345 struct dentry *dentry = file->f_path.dentry;346 347 spin_lock(&dentry->d_lock);348 ino = ceph_present_inode(dentry->d_parent->d_inode);349 spin_unlock(&dentry->d_lock);350 351 doutc(cl, "%p %llx.%llx off 1 -> '..'\n", inode,352 ceph_vinop(inode));353 if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12))354 return 0;355 ctx->pos = 2;356 }357 358 err = ceph_fscrypt_prepare_readdir(inode);359 if (err < 0)360 return err;361 362 spin_lock(&ci->i_ceph_lock);363 /* request Fx cap. if have Fx, we don't need to release Fs cap364 * for later create/unlink. */365 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR);366 /* can we use the dcache? */367 if (ceph_test_mount_opt(fsc, DCACHE) &&368 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&369 ceph_snap(inode) != CEPH_SNAPDIR &&370 __ceph_dir_is_complete_ordered(ci) &&371 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {372 int shared_gen = atomic_read(&ci->i_shared_gen);373 374 spin_unlock(&ci->i_ceph_lock);375 err = __dcache_readdir(file, ctx, shared_gen);376 if (err != -EAGAIN)377 return err;378 } else {379 spin_unlock(&ci->i_ceph_lock);380 }381 382 /* proceed with a normal readdir */383more:384 /* do we have the correct frag content buffered? */385 if (need_send_readdir(dfi, ctx->pos)) {386 struct ceph_mds_request *req;387 int op = ceph_snap(inode) == CEPH_SNAPDIR ?388 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;389 390 /* discard old result, if any */391 if (dfi->last_readdir) {392 ceph_mdsc_put_request(dfi->last_readdir);393 dfi->last_readdir = NULL;394 }395 396 if (is_hash_order(ctx->pos)) {397 /* fragtree isn't always accurate. choose frag398 * based on previous reply when possible. */399 if (frag == (unsigned)-1)400 frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),401 NULL, NULL);402 } else {403 frag = fpos_frag(ctx->pos);404 }405 406 doutc(cl, "fetching %p %llx.%llx frag %x offset '%s'\n",407 inode, ceph_vinop(inode), frag, dfi->last_name);408 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);409 if (IS_ERR(req))410 return PTR_ERR(req);411 412 err = ceph_alloc_readdir_reply_buffer(req, inode);413 if (err) {414 ceph_mdsc_put_request(req);415 return err;416 }417 /* hints to request -> mds selection code */418 req->r_direct_mode = USE_AUTH_MDS;419 if (op == CEPH_MDS_OP_READDIR) {420 req->r_direct_hash = ceph_frag_value(frag);421 __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);422 req->r_inode_drop = CEPH_CAP_FILE_EXCL;423 }424 if (dfi->last_name) {425 struct qstr d_name = { .name = dfi->last_name,426 .len = strlen(dfi->last_name) };427 428 req->r_path2 = kzalloc(NAME_MAX + 1, GFP_KERNEL);429 if (!req->r_path2) {430 ceph_mdsc_put_request(req);431 return -ENOMEM;432 }433 434 err = ceph_encode_encrypted_dname(inode, &d_name,435 req->r_path2);436 if (err < 0) {437 ceph_mdsc_put_request(req);438 return err;439 }440 } else if (is_hash_order(ctx->pos)) {441 req->r_args.readdir.offset_hash =442 cpu_to_le32(fpos_hash(ctx->pos));443 }444 445 req->r_dir_release_cnt = dfi->dir_release_count;446 req->r_dir_ordered_cnt = dfi->dir_ordered_count;447 req->r_readdir_cache_idx = dfi->readdir_cache_idx;448 req->r_readdir_offset = dfi->next_offset;449 req->r_args.readdir.frag = cpu_to_le32(frag);450 req->r_args.readdir.flags =451 cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);452 453 req->r_inode = inode;454 ihold(inode);455 req->r_dentry = dget(file->f_path.dentry);456 err = ceph_mdsc_do_request(mdsc, NULL, req);457 if (err < 0) {458 ceph_mdsc_put_request(req);459 return err;460 }461 doutc(cl, "%p %llx.%llx got and parsed readdir result=%d"462 "on frag %x, end=%d, complete=%d, hash_order=%d\n",463 inode, ceph_vinop(inode), err, frag,464 (int)req->r_reply_info.dir_end,465 (int)req->r_reply_info.dir_complete,466 (int)req->r_reply_info.hash_order);467 468 rinfo = &req->r_reply_info;469 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {470 frag = le32_to_cpu(rinfo->dir_dir->frag);471 if (!rinfo->hash_order) {472 dfi->next_offset = req->r_readdir_offset;473 /* adjust ctx->pos to beginning of frag */474 ctx->pos = ceph_make_fpos(frag,475 dfi->next_offset,476 false);477 }478 }479 480 dfi->frag = frag;481 dfi->last_readdir = req;482 483 if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {484 dfi->readdir_cache_idx = req->r_readdir_cache_idx;485 if (dfi->readdir_cache_idx < 0) {486 /* preclude from marking dir ordered */487 dfi->dir_ordered_count = 0;488 } else if (ceph_frag_is_leftmost(frag) &&489 dfi->next_offset == 2) {490 /* note dir version at start of readdir so491 * we can tell if any dentries get dropped */492 dfi->dir_release_count = req->r_dir_release_cnt;493 dfi->dir_ordered_count = req->r_dir_ordered_cnt;494 }495 } else {496 doutc(cl, "%p %llx.%llx !did_prepopulate\n", inode,497 ceph_vinop(inode));498 /* disable readdir cache */499 dfi->readdir_cache_idx = -1;500 /* preclude from marking dir complete */501 dfi->dir_release_count = 0;502 }503 504 /* note next offset and last dentry name */505 if (rinfo->dir_nr > 0) {506 struct ceph_mds_reply_dir_entry *rde =507 rinfo->dir_entries + (rinfo->dir_nr-1);508 unsigned next_offset = req->r_reply_info.dir_end ?509 2 : (fpos_off(rde->offset) + 1);510 err = note_last_dentry(fsc, dfi, rde->name,511 rde->name_len, next_offset);512 if (err) {513 ceph_mdsc_put_request(dfi->last_readdir);514 dfi->last_readdir = NULL;515 return err;516 }517 } else if (req->r_reply_info.dir_end) {518 dfi->next_offset = 2;519 /* keep last name */520 }521 }522 523 rinfo = &dfi->last_readdir->r_reply_info;524 doutc(cl, "%p %llx.%llx frag %x num %d pos %llx chunk first %llx\n",525 inode, ceph_vinop(inode), dfi->frag, rinfo->dir_nr, ctx->pos,526 rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);527 528 i = 0;529 /* search start position */530 if (rinfo->dir_nr > 0) {531 int step, nr = rinfo->dir_nr;532 while (nr > 0) {533 step = nr >> 1;534 if (rinfo->dir_entries[i + step].offset < ctx->pos) {535 i += step + 1;536 nr -= step + 1;537 } else {538 nr = step;539 }540 }541 }542 for (; i < rinfo->dir_nr; i++) {543 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;544 545 if (rde->offset < ctx->pos) {546 pr_warn_client(cl,547 "%p %llx.%llx rde->offset 0x%llx ctx->pos 0x%llx\n",548 inode, ceph_vinop(inode), rde->offset, ctx->pos);549 return -EIO;550 }551 552 if (WARN_ON_ONCE(!rde->inode.in))553 return -EIO;554 555 ctx->pos = rde->offset;556 doutc(cl, "%p %llx.%llx (%d/%d) -> %llx '%.*s' %p\n", inode,557 ceph_vinop(inode), i, rinfo->dir_nr, ctx->pos,558 rde->name_len, rde->name, &rde->inode.in);559 560 if (!dir_emit(ctx, rde->name, rde->name_len,561 ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)),562 le32_to_cpu(rde->inode.in->mode) >> 12)) {563 /*564 * NOTE: Here no need to put the 'dfi->last_readdir',565 * because when dir_emit stops us it's most likely566 * doesn't have enough memory, etc. So for next readdir567 * it will continue.568 */569 doutc(cl, "filldir stopping us...\n");570 return 0;571 }572 573 /* Reset the lengths to their original allocated vals */574 ctx->pos++;575 }576 577 ceph_mdsc_put_request(dfi->last_readdir);578 dfi->last_readdir = NULL;579 580 if (dfi->next_offset > 2) {581 frag = dfi->frag;582 goto more;583 }584 585 /* more frags? */586 if (!ceph_frag_is_rightmost(dfi->frag)) {587 frag = ceph_frag_next(dfi->frag);588 if (is_hash_order(ctx->pos)) {589 loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),590 dfi->next_offset, true);591 if (new_pos > ctx->pos)592 ctx->pos = new_pos;593 /* keep last_name */594 } else {595 ctx->pos = ceph_make_fpos(frag, dfi->next_offset,596 false);597 kfree(dfi->last_name);598 dfi->last_name = NULL;599 }600 doutc(cl, "%p %llx.%llx next frag is %x\n", inode,601 ceph_vinop(inode), frag);602 goto more;603 }604 dfi->file_info.flags |= CEPH_F_ATEND;605 606 /*607 * if dir_release_count still matches the dir, no dentries608 * were released during the whole readdir, and we should have609 * the complete dir contents in our cache.610 */611 if (atomic64_read(&ci->i_release_count) ==612 dfi->dir_release_count) {613 spin_lock(&ci->i_ceph_lock);614 if (dfi->dir_ordered_count ==615 atomic64_read(&ci->i_ordered_count)) {616 doutc(cl, " marking %p %llx.%llx complete and ordered\n",617 inode, ceph_vinop(inode));618 /* use i_size to track number of entries in619 * readdir cache */620 BUG_ON(dfi->readdir_cache_idx < 0);621 i_size_write(inode, dfi->readdir_cache_idx *622 sizeof(struct dentry*));623 } else {624 doutc(cl, " marking %llx.%llx complete\n",625 ceph_vinop(inode));626 }627 __ceph_dir_set_complete(ci, dfi->dir_release_count,628 dfi->dir_ordered_count);629 spin_unlock(&ci->i_ceph_lock);630 }631 doutc(cl, "%p %llx.%llx file %p done.\n", inode, ceph_vinop(inode),632 file);633 return 0;634}635 636static void reset_readdir(struct ceph_dir_file_info *dfi)637{638 if (dfi->last_readdir) {639 ceph_mdsc_put_request(dfi->last_readdir);640 dfi->last_readdir = NULL;641 }642 kfree(dfi->last_name);643 dfi->last_name = NULL;644 dfi->dir_release_count = 0;645 dfi->readdir_cache_idx = -1;646 dfi->next_offset = 2; /* compensate for . and .. */647 dfi->file_info.flags &= ~CEPH_F_ATEND;648}649 650/*651 * discard buffered readdir content on seekdir(0), or seek to new frag,652 * or seek prior to current chunk653 */654static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos)655{656 struct ceph_mds_reply_info_parsed *rinfo;657 loff_t chunk_offset;658 if (new_pos == 0)659 return true;660 if (is_hash_order(new_pos)) {661 /* no need to reset last_name for a forward seek when662 * dentries are sotred in hash order */663 } else if (dfi->frag != fpos_frag(new_pos)) {664 return true;665 }666 rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL;667 if (!rinfo || !rinfo->dir_nr)668 return true;669 chunk_offset = rinfo->dir_entries[0].offset;670 return new_pos < chunk_offset ||671 is_hash_order(new_pos) != is_hash_order(chunk_offset);672}673 674static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)675{676 struct ceph_dir_file_info *dfi = file->private_data;677 struct inode *inode = file->f_mapping->host;678 struct ceph_client *cl = ceph_inode_to_client(inode);679 loff_t retval;680 681 inode_lock(inode);682 retval = -EINVAL;683 switch (whence) {684 case SEEK_CUR:685 offset += file->f_pos;686 break;687 case SEEK_SET:688 break;689 case SEEK_END:690 retval = -EOPNOTSUPP;691 goto out;692 default:693 goto out;694 }695 696 if (offset >= 0) {697 if (need_reset_readdir(dfi, offset)) {698 doutc(cl, "%p %llx.%llx dropping %p content\n",699 inode, ceph_vinop(inode), file);700 reset_readdir(dfi);701 } else if (is_hash_order(offset) && offset > file->f_pos) {702 /* for hash offset, we don't know if a forward seek703 * is within same frag */704 dfi->dir_release_count = 0;705 dfi->readdir_cache_idx = -1;706 }707 708 if (offset != file->f_pos) {709 file->f_pos = offset;710 dfi->file_info.flags &= ~CEPH_F_ATEND;711 }712 retval = offset;713 }714out:715 inode_unlock(inode);716 return retval;717}718 719/*720 * Handle lookups for the hidden .snap directory.721 */722struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req,723 struct dentry *dentry)724{725 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb);726 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */727 struct ceph_client *cl = ceph_inode_to_client(parent);728 729 /* .snap dir? */730 if (ceph_snap(parent) == CEPH_NOSNAP &&731 strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) {732 struct dentry *res;733 struct inode *inode = ceph_get_snapdir(parent);734 735 res = d_splice_alias(inode, dentry);736 doutc(cl, "ENOENT on snapdir %p '%pd', linking to "737 "snapdir %p %llx.%llx. Spliced dentry %p\n",738 dentry, dentry, inode, ceph_vinop(inode), res);739 if (res)740 dentry = res;741 }742 return dentry;743}744 745/*746 * Figure out final result of a lookup/open request.747 *748 * Mainly, make sure we return the final req->r_dentry (if it already749 * existed) in place of the original VFS-provided dentry when they750 * differ.751 *752 * Gracefully handle the case where the MDS replies with -ENOENT and753 * no trace (which it may do, at its discretion, e.g., if it doesn't754 * care to issue a lease on the negative dentry).755 */756struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,757 struct dentry *dentry, int err)758{759 struct ceph_client *cl = req->r_mdsc->fsc->client;760 761 if (err == -ENOENT) {762 /* no trace? */763 err = 0;764 if (!req->r_reply_info.head->is_dentry) {765 doutc(cl,766 "ENOENT and no trace, dentry %p inode %llx.%llx\n",767 dentry, ceph_vinop(d_inode(dentry)));768 if (d_really_is_positive(dentry)) {769 d_drop(dentry);770 err = -ENOENT;771 } else {772 d_add(dentry, NULL);773 }774 }775 }776 if (err)777 dentry = ERR_PTR(err);778 else if (dentry != req->r_dentry)779 dentry = dget(req->r_dentry); /* we got spliced */780 else781 dentry = NULL;782 return dentry;783}784 785static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)786{787 return ceph_ino(inode) == CEPH_INO_ROOT &&788 strncmp(dentry->d_name.name, ".ceph", 5) == 0;789}790 791/*792 * Look up a single dir entry. If there is a lookup intent, inform793 * the MDS so that it gets our 'caps wanted' value in a single op.794 */795static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,796 unsigned int flags)797{798 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);799 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);800 struct ceph_client *cl = fsc->client;801 struct ceph_mds_request *req;802 int op;803 int mask;804 int err;805 806 doutc(cl, "%p %llx.%llx/'%pd' dentry %p\n", dir, ceph_vinop(dir),807 dentry, dentry);808 809 if (dentry->d_name.len > NAME_MAX)810 return ERR_PTR(-ENAMETOOLONG);811 812 if (IS_ENCRYPTED(dir)) {813 bool had_key = fscrypt_has_encryption_key(dir);814 815 err = fscrypt_prepare_lookup_partial(dir, dentry);816 if (err < 0)817 return ERR_PTR(err);818 819 /* mark directory as incomplete if it has been unlocked */820 if (!had_key && fscrypt_has_encryption_key(dir))821 ceph_dir_clear_complete(dir);822 }823 824 /* can we conclude ENOENT locally? */825 if (d_really_is_negative(dentry)) {826 struct ceph_inode_info *ci = ceph_inode(dir);827 struct ceph_dentry_info *di = ceph_dentry(dentry);828 829 spin_lock(&ci->i_ceph_lock);830 doutc(cl, " dir %llx.%llx flags are 0x%lx\n",831 ceph_vinop(dir), ci->i_ceph_flags);832 if (strncmp(dentry->d_name.name,833 fsc->mount_options->snapdir_name,834 dentry->d_name.len) &&835 !is_root_ceph_dentry(dir, dentry) &&836 ceph_test_mount_opt(fsc, DCACHE) &&837 __ceph_dir_is_complete(ci) &&838 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) {839 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);840 spin_unlock(&ci->i_ceph_lock);841 doutc(cl, " dir %llx.%llx complete, -ENOENT\n",842 ceph_vinop(dir));843 d_add(dentry, NULL);844 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);845 return NULL;846 }847 spin_unlock(&ci->i_ceph_lock);848 }849 850 op = ceph_snap(dir) == CEPH_SNAPDIR ?851 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;852 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);853 if (IS_ERR(req))854 return ERR_CAST(req);855 req->r_dentry = dget(dentry);856 req->r_num_caps = 2;857 858 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;859 if (ceph_security_xattr_wanted(dir))860 mask |= CEPH_CAP_XATTR_SHARED;861 req->r_args.getattr.mask = cpu_to_le32(mask);862 863 ihold(dir);864 req->r_parent = dir;865 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);866 err = ceph_mdsc_do_request(mdsc, NULL, req);867 if (err == -ENOENT) {868 struct dentry *res;869 870 res = ceph_handle_snapdir(req, dentry);871 if (IS_ERR(res)) {872 err = PTR_ERR(res);873 } else {874 dentry = res;875 err = 0;876 }877 }878 dentry = ceph_finish_lookup(req, dentry, err);879 ceph_mdsc_put_request(req); /* will dput(dentry) */880 doutc(cl, "result=%p\n", dentry);881 return dentry;882}883 884/*885 * If we do a create but get no trace back from the MDS, follow up with886 * a lookup (the VFS expects us to link up the provided dentry).887 */888int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)889{890 struct dentry *result = ceph_lookup(dir, dentry, 0);891 892 if (result && !IS_ERR(result)) {893 /*894 * We created the item, then did a lookup, and found895 * it was already linked to another inode we already896 * had in our cache (and thus got spliced). To not897 * confuse VFS (especially when inode is a directory),898 * we don't link our dentry to that inode, return an899 * error instead.900 *901 * This event should be rare and it happens only when902 * we talk to old MDS. Recent MDS does not send traceless903 * reply for request that creates new inode.904 */905 d_drop(result);906 return -ESTALE;907 }908 return PTR_ERR(result);909}910 911static int ceph_mknod(struct mnt_idmap *idmap, struct inode *dir,912 struct dentry *dentry, umode_t mode, dev_t rdev)913{914 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);915 struct ceph_client *cl = mdsc->fsc->client;916 struct ceph_mds_request *req;917 struct ceph_acl_sec_ctx as_ctx = {};918 int err;919 920 if (ceph_snap(dir) != CEPH_NOSNAP)921 return -EROFS;922 923 err = ceph_wait_on_conflict_unlink(dentry);924 if (err)925 return err;926 927 if (ceph_quota_is_max_files_exceeded(dir)) {928 err = -EDQUOT;929 goto out;930 }931 932 doutc(cl, "%p %llx.%llx/'%pd' dentry %p mode 0%ho rdev %d\n",933 dir, ceph_vinop(dir), dentry, dentry, mode, rdev);934 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);935 if (IS_ERR(req)) {936 err = PTR_ERR(req);937 goto out;938 }939 940 req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);941 if (IS_ERR(req->r_new_inode)) {942 err = PTR_ERR(req->r_new_inode);943 req->r_new_inode = NULL;944 goto out_req;945 }946 947 if (S_ISREG(mode) && IS_ENCRYPTED(dir))948 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);949 950 req->r_dentry = dget(dentry);951 req->r_num_caps = 2;952 req->r_parent = dir;953 ihold(dir);954 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);955 req->r_mnt_idmap = mnt_idmap_get(idmap);956 req->r_args.mknod.mode = cpu_to_le32(mode);957 req->r_args.mknod.rdev = cpu_to_le32(rdev);958 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |959 CEPH_CAP_XATTR_EXCL;960 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;961 962 ceph_as_ctx_to_req(req, &as_ctx);963 964 err = ceph_mdsc_do_request(mdsc, dir, req);965 if (!err && !req->r_reply_info.head->is_dentry)966 err = ceph_handle_notrace_create(dir, dentry);967out_req:968 ceph_mdsc_put_request(req);969out:970 if (!err)971 ceph_init_inode_acls(d_inode(dentry), &as_ctx);972 else973 d_drop(dentry);974 ceph_release_acl_sec_ctx(&as_ctx);975 return err;976}977 978static int ceph_create(struct mnt_idmap *idmap, struct inode *dir,979 struct dentry *dentry, umode_t mode, bool excl)980{981 return ceph_mknod(idmap, dir, dentry, mode, 0);982}983 984#if IS_ENABLED(CONFIG_FS_ENCRYPTION)985static int prep_encrypted_symlink_target(struct ceph_mds_request *req,986 const char *dest)987{988 int err;989 int len = strlen(dest);990 struct fscrypt_str osd_link = FSTR_INIT(NULL, 0);991 992 err = fscrypt_prepare_symlink(req->r_parent, dest, len, PATH_MAX,993 &osd_link);994 if (err)995 goto out;996 997 err = fscrypt_encrypt_symlink(req->r_new_inode, dest, len, &osd_link);998 if (err)999 goto out;1000 1001 req->r_path2 = kmalloc(CEPH_BASE64_CHARS(osd_link.len) + 1, GFP_KERNEL);1002 if (!req->r_path2) {1003 err = -ENOMEM;1004 goto out;1005 }1006 1007 len = ceph_base64_encode(osd_link.name, osd_link.len, req->r_path2);1008 req->r_path2[len] = '\0';1009out:1010 fscrypt_fname_free_buffer(&osd_link);1011 return err;1012}1013#else1014static int prep_encrypted_symlink_target(struct ceph_mds_request *req,1015 const char *dest)1016{1017 return -EOPNOTSUPP;1018}1019#endif1020 1021static int ceph_symlink(struct mnt_idmap *idmap, struct inode *dir,1022 struct dentry *dentry, const char *dest)1023{1024 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);1025 struct ceph_client *cl = mdsc->fsc->client;1026 struct ceph_mds_request *req;1027 struct ceph_acl_sec_ctx as_ctx = {};1028 umode_t mode = S_IFLNK | 0777;1029 int err;1030 1031 if (ceph_snap(dir) != CEPH_NOSNAP)1032 return -EROFS;1033 1034 err = ceph_wait_on_conflict_unlink(dentry);1035 if (err)1036 return err;1037 1038 if (ceph_quota_is_max_files_exceeded(dir)) {1039 err = -EDQUOT;1040 goto out;1041 }1042 1043 doutc(cl, "%p %llx.%llx/'%pd' to '%s'\n", dir, ceph_vinop(dir), dentry,1044 dest);1045 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);1046 if (IS_ERR(req)) {1047 err = PTR_ERR(req);1048 goto out;1049 }1050 1051 req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);1052 if (IS_ERR(req->r_new_inode)) {1053 err = PTR_ERR(req->r_new_inode);1054 req->r_new_inode = NULL;1055 goto out_req;1056 }1057 1058 req->r_parent = dir;1059 ihold(dir);1060 1061 if (IS_ENCRYPTED(req->r_new_inode)) {1062 err = prep_encrypted_symlink_target(req, dest);1063 if (err)1064 goto out_req;1065 } else {1066 req->r_path2 = kstrdup(dest, GFP_KERNEL);1067 if (!req->r_path2) {1068 err = -ENOMEM;1069 goto out_req;1070 }1071 }1072 1073 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);1074 req->r_mnt_idmap = mnt_idmap_get(idmap);1075 req->r_dentry = dget(dentry);1076 req->r_num_caps = 2;1077 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |1078 CEPH_CAP_XATTR_EXCL;1079 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;1080 1081 ceph_as_ctx_to_req(req, &as_ctx);1082 1083 err = ceph_mdsc_do_request(mdsc, dir, req);1084 if (!err && !req->r_reply_info.head->is_dentry)1085 err = ceph_handle_notrace_create(dir, dentry);1086out_req:1087 ceph_mdsc_put_request(req);1088out:1089 if (err)1090 d_drop(dentry);1091 ceph_release_acl_sec_ctx(&as_ctx);1092 return err;1093}1094 1095static int ceph_mkdir(struct mnt_idmap *idmap, struct inode *dir,1096 struct dentry *dentry, umode_t mode)1097{1098 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);1099 struct ceph_client *cl = mdsc->fsc->client;1100 struct ceph_mds_request *req;1101 struct ceph_acl_sec_ctx as_ctx = {};1102 int err;1103 int op;1104 1105 err = ceph_wait_on_conflict_unlink(dentry);1106 if (err)1107 return err;1108 1109 if (ceph_snap(dir) == CEPH_SNAPDIR) {1110 /* mkdir .snap/foo is a MKSNAP */1111 op = CEPH_MDS_OP_MKSNAP;1112 doutc(cl, "mksnap %llx.%llx/'%pd' dentry %p\n",1113 ceph_vinop(dir), dentry, dentry);1114 } else if (ceph_snap(dir) == CEPH_NOSNAP) {1115 doutc(cl, "mkdir %llx.%llx/'%pd' dentry %p mode 0%ho\n",1116 ceph_vinop(dir), dentry, dentry, mode);1117 op = CEPH_MDS_OP_MKDIR;1118 } else {1119 err = -EROFS;1120 goto out;1121 }1122 1123 if (op == CEPH_MDS_OP_MKDIR &&1124 ceph_quota_is_max_files_exceeded(dir)) {1125 err = -EDQUOT;1126 goto out;1127 }1128 if ((op == CEPH_MDS_OP_MKSNAP) && IS_ENCRYPTED(dir) &&1129 !fscrypt_has_encryption_key(dir)) {1130 err = -ENOKEY;1131 goto out;1132 }1133 1134 1135 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);1136 if (IS_ERR(req)) {1137 err = PTR_ERR(req);1138 goto out;1139 }1140 1141 mode |= S_IFDIR;1142 req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);1143 if (IS_ERR(req->r_new_inode)) {1144 err = PTR_ERR(req->r_new_inode);1145 req->r_new_inode = NULL;1146 goto out_req;1147 }1148 1149 req->r_dentry = dget(dentry);1150 req->r_num_caps = 2;1151 req->r_parent = dir;1152 ihold(dir);1153 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);1154 if (op == CEPH_MDS_OP_MKDIR)1155 req->r_mnt_idmap = mnt_idmap_get(idmap);1156 req->r_args.mkdir.mode = cpu_to_le32(mode);1157 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |1158 CEPH_CAP_XATTR_EXCL;1159 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;1160 1161 ceph_as_ctx_to_req(req, &as_ctx);1162 1163 err = ceph_mdsc_do_request(mdsc, dir, req);1164 if (!err &&1165 !req->r_reply_info.head->is_target &&1166 !req->r_reply_info.head->is_dentry)1167 err = ceph_handle_notrace_create(dir, dentry);1168out_req:1169 ceph_mdsc_put_request(req);1170out:1171 if (!err)1172 ceph_init_inode_acls(d_inode(dentry), &as_ctx);1173 else1174 d_drop(dentry);1175 ceph_release_acl_sec_ctx(&as_ctx);1176 return err;1177}1178 1179static int ceph_link(struct dentry *old_dentry, struct inode *dir,1180 struct dentry *dentry)1181{1182 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);1183 struct ceph_client *cl = mdsc->fsc->client;1184 struct ceph_mds_request *req;1185 int err;1186 1187 if (dentry->d_flags & DCACHE_DISCONNECTED)1188 return -EINVAL;1189 1190 err = ceph_wait_on_conflict_unlink(dentry);1191 if (err)1192 return err;1193 1194 if (ceph_snap(dir) != CEPH_NOSNAP)1195 return -EROFS;1196 1197 err = fscrypt_prepare_link(old_dentry, dir, dentry);1198 if (err)1199 return err;1200 1201 doutc(cl, "%p %llx.%llx/'%pd' to '%pd'\n", dir, ceph_vinop(dir),1202 old_dentry, dentry);1203 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);1204 if (IS_ERR(req)) {1205 d_drop(dentry);1206 return PTR_ERR(req);1207 }1208 req->r_dentry = dget(dentry);1209 req->r_num_caps = 2;1210 req->r_old_dentry = dget(old_dentry);1211 /*1212 * The old_dentry maybe a DCACHE_DISCONNECTED dentry, then we1213 * will just pass the ino# to MDSs.1214 */1215 if (old_dentry->d_flags & DCACHE_DISCONNECTED)1216 req->r_ino2 = ceph_vino(d_inode(old_dentry));1217 req->r_parent = dir;1218 ihold(dir);1219 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);1220 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL;1221 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;1222 /* release LINK_SHARED on source inode (mds will lock it) */1223 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;1224 err = ceph_mdsc_do_request(mdsc, dir, req);1225 if (err) {1226 d_drop(dentry);1227 } else if (!req->r_reply_info.head->is_dentry) {1228 ihold(d_inode(old_dentry));1229 d_instantiate(dentry, d_inode(old_dentry));1230 }1231 ceph_mdsc_put_request(req);1232 return err;1233}1234 1235static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc,1236 struct ceph_mds_request *req)1237{1238 struct dentry *dentry = req->r_dentry;1239 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb);1240 struct ceph_client *cl = fsc->client;1241 struct ceph_dentry_info *di = ceph_dentry(dentry);1242 int result = req->r_err ? req->r_err :1243 le32_to_cpu(req->r_reply_info.head->result);1244 1245 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))1246 pr_warn_client(cl,1247 "dentry %p:%pd async unlink bit is not set\n",1248 dentry, dentry);1249 1250 spin_lock(&fsc->async_unlink_conflict_lock);1251 hash_del_rcu(&di->hnode);1252 spin_unlock(&fsc->async_unlink_conflict_lock);1253 1254 spin_lock(&dentry->d_lock);1255 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;1256 wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT);1257 spin_unlock(&dentry->d_lock);1258 1259 synchronize_rcu();1260 1261 if (result == -EJUKEBOX)1262 goto out;1263 1264 /* If op failed, mark everyone involved for errors */1265 if (result) {1266 int pathlen = 0;1267 u64 base = 0;1268 char *path = ceph_mdsc_build_path(mdsc, dentry, &pathlen,1269 &base, 0);1270 1271 /* mark error on parent + clear complete */1272 mapping_set_error(req->r_parent->i_mapping, result);1273 ceph_dir_clear_complete(req->r_parent);1274 1275 /* drop the dentry -- we don't know its status */1276 if (!d_unhashed(dentry))1277 d_drop(dentry);1278 1279 /* mark inode itself for an error (since metadata is bogus) */1280 mapping_set_error(req->r_old_inode->i_mapping, result);1281 1282 pr_warn_client(cl, "failure path=(%llx)%s result=%d!\n",1283 base, IS_ERR(path) ? "<<bad>>" : path, result);1284 ceph_mdsc_free_path(path, pathlen);1285 }1286out:1287 iput(req->r_old_inode);1288 ceph_mdsc_release_dir_caps(req);1289}1290 1291static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry)1292{1293 struct ceph_inode_info *ci = ceph_inode(dir);1294 struct ceph_dentry_info *di;1295 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;1296 1297 spin_lock(&ci->i_ceph_lock);1298 if ((__ceph_caps_issued(ci, NULL) & want) == want) {1299 ceph_take_cap_refs(ci, want, false);1300 got = want;1301 }1302 spin_unlock(&ci->i_ceph_lock);1303 1304 /* If we didn't get anything, return 0 */1305 if (!got)1306 return 0;1307 1308 spin_lock(&dentry->d_lock);1309 di = ceph_dentry(dentry);1310 /*1311 * - We are holding Fx, which implies Fs caps.1312 * - Only support async unlink for primary linkage1313 */1314 if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen ||1315 !(di->flags & CEPH_DENTRY_PRIMARY_LINK))1316 want = 0;1317 spin_unlock(&dentry->d_lock);1318 1319 /* Do we still want what we've got? */1320 if (want == got)1321 return got;1322 1323 ceph_put_cap_refs(ci, got);1324 return 0;1325}1326 1327/*1328 * rmdir and unlink are differ only by the metadata op code1329 */1330static int ceph_unlink(struct inode *dir, struct dentry *dentry)1331{1332 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);1333 struct ceph_client *cl = fsc->client;1334 struct ceph_mds_client *mdsc = fsc->mdsc;1335 struct inode *inode = d_inode(dentry);1336 struct ceph_mds_request *req;1337 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);1338 struct dentry *dn;1339 int err = -EROFS;1340 int op;1341 char *path;1342 int pathlen;1343 u64 pathbase;1344 1345 if (ceph_snap(dir) == CEPH_SNAPDIR) {1346 /* rmdir .snap/foo is RMSNAP */1347 doutc(cl, "rmsnap %llx.%llx/'%pd' dn\n", ceph_vinop(dir),1348 dentry);1349 op = CEPH_MDS_OP_RMSNAP;1350 } else if (ceph_snap(dir) == CEPH_NOSNAP) {1351 doutc(cl, "unlink/rmdir %llx.%llx/'%pd' inode %llx.%llx\n",1352 ceph_vinop(dir), dentry, ceph_vinop(inode));1353 op = d_is_dir(dentry) ?1354 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;1355 } else1356 goto out;1357 1358 dn = d_find_alias(dir);1359 if (!dn) {1360 try_async = false;1361 } else {1362 path = ceph_mdsc_build_path(mdsc, dn, &pathlen, &pathbase, 0);1363 if (IS_ERR(path)) {1364 try_async = false;1365 err = 0;1366 } else {1367 err = ceph_mds_check_access(mdsc, path, MAY_WRITE);1368 }1369 ceph_mdsc_free_path(path, pathlen);1370 dput(dn);1371 1372 /* For none EACCES cases will let the MDS do the mds auth check */1373 if (err == -EACCES) {1374 return err;1375 } else if (err < 0) {1376 try_async = false;1377 err = 0;1378 }1379 }1380 1381retry:1382 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);1383 if (IS_ERR(req)) {1384 err = PTR_ERR(req);1385 goto out;1386 }1387 req->r_dentry = dget(dentry);1388 req->r_num_caps = 2;1389 req->r_parent = dir;1390 ihold(dir);1391 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL;1392 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;1393 req->r_inode_drop = ceph_drop_caps_for_unlink(inode);1394 1395 if (try_async && op == CEPH_MDS_OP_UNLINK &&1396 (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) {1397 struct ceph_dentry_info *di = ceph_dentry(dentry);1398 1399 doutc(cl, "async unlink on %llx.%llx/'%pd' caps=%s",1400 ceph_vinop(dir), dentry,1401 ceph_cap_string(req->r_dir_caps));1402 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);1403 req->r_callback = ceph_async_unlink_cb;1404 req->r_old_inode = d_inode(dentry);1405 ihold(req->r_old_inode);1406 1407 spin_lock(&dentry->d_lock);1408 di->flags |= CEPH_DENTRY_ASYNC_UNLINK;1409 spin_unlock(&dentry->d_lock);1410 1411 spin_lock(&fsc->async_unlink_conflict_lock);1412 hash_add_rcu(fsc->async_unlink_conflict, &di->hnode,1413 dentry->d_name.hash);1414 spin_unlock(&fsc->async_unlink_conflict_lock);1415 1416 err = ceph_mdsc_submit_request(mdsc, dir, req);1417 if (!err) {1418 /*1419 * We have enough caps, so we assume that the unlink1420 * will succeed. Fix up the target inode and dcache.1421 */1422 drop_nlink(inode);1423 d_delete(dentry);1424 } else {1425 spin_lock(&fsc->async_unlink_conflict_lock);1426 hash_del_rcu(&di->hnode);1427 spin_unlock(&fsc->async_unlink_conflict_lock);1428 1429 spin_lock(&dentry->d_lock);1430 di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK;1431 spin_unlock(&dentry->d_lock);1432 1433 if (err == -EJUKEBOX) {1434 try_async = false;1435 ceph_mdsc_put_request(req);1436 goto retry;1437 }1438 }1439 } else {1440 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);1441 err = ceph_mdsc_do_request(mdsc, dir, req);1442 if (!err && !req->r_reply_info.head->is_dentry)1443 d_delete(dentry);1444 }1445 1446 ceph_mdsc_put_request(req);1447out:1448 return err;1449}1450 1451static int ceph_rename(struct mnt_idmap *idmap, struct inode *old_dir,1452 struct dentry *old_dentry, struct inode *new_dir,1453 struct dentry *new_dentry, unsigned int flags)1454{1455 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb);1456 struct ceph_client *cl = mdsc->fsc->client;1457 struct ceph_mds_request *req;1458 int op = CEPH_MDS_OP_RENAME;1459 int err;1460 1461 if (flags)1462 return -EINVAL;1463 1464 if (ceph_snap(old_dir) != ceph_snap(new_dir))1465 return -EXDEV;1466 if (ceph_snap(old_dir) != CEPH_NOSNAP) {1467 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)1468 op = CEPH_MDS_OP_RENAMESNAP;1469 else1470 return -EROFS;1471 }1472 /* don't allow cross-quota renames */1473 if ((old_dir != new_dir) &&1474 (!ceph_quota_is_same_realm(old_dir, new_dir)))1475 return -EXDEV;1476 1477 err = ceph_wait_on_conflict_unlink(new_dentry);1478 if (err)1479 return err;1480 1481 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,1482 flags);1483 if (err)1484 return err;1485 1486 doutc(cl, "%llx.%llx/'%pd' to %llx.%llx/'%pd'\n",1487 ceph_vinop(old_dir), old_dentry, ceph_vinop(new_dir),1488 new_dentry);1489 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);1490 if (IS_ERR(req))1491 return PTR_ERR(req);1492 ihold(old_dir);1493 req->r_dentry = dget(new_dentry);1494 req->r_num_caps = 2;1495 req->r_old_dentry = dget(old_dentry);1496 req->r_old_dentry_dir = old_dir;1497 req->r_parent = new_dir;1498 ihold(new_dir);1499 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);1500 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL;1501 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;1502 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL;1503 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;1504 /* release LINK_RDCACHE on source inode (mds will lock it) */1505 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;1506 if (d_really_is_positive(new_dentry)) {1507 req->r_inode_drop =1508 ceph_drop_caps_for_unlink(d_inode(new_dentry));1509 }1510 err = ceph_mdsc_do_request(mdsc, old_dir, req);1511 if (!err && !req->r_reply_info.head->is_dentry) {1512 /*1513 * Normally d_move() is done by fill_trace (called by1514 * do_request, above). If there is no trace, we need1515 * to do it here.1516 */1517 d_move(old_dentry, new_dentry);1518 }1519 ceph_mdsc_put_request(req);1520 return err;1521}1522 1523/*1524 * Move dentry to tail of mdsc->dentry_leases list when lease is updated.1525 * Leases at front of the list will expire first. (Assume all leases have1526 * similar duration)1527 *1528 * Called under dentry->d_lock.1529 */1530void __ceph_dentry_lease_touch(struct ceph_dentry_info *di)1531{1532 struct dentry *dn = di->dentry;1533 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc;1534 struct ceph_client *cl = mdsc->fsc->client;1535 1536 doutc(cl, "%p %p '%pd'\n", di, dn, dn);1537 1538 di->flags |= CEPH_DENTRY_LEASE_LIST;1539 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {1540 di->flags |= CEPH_DENTRY_REFERENCED;1541 return;1542 }1543 1544 spin_lock(&mdsc->dentry_list_lock);1545 list_move_tail(&di->lease_list, &mdsc->dentry_leases);1546 spin_unlock(&mdsc->dentry_list_lock);1547}1548 1549static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc,1550 struct ceph_dentry_info *di)1551{1552 di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED);1553 di->lease_gen = 0;1554 di->time = jiffies;1555 list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);1556}1557 1558/*1559 * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases1560 * list if it's not in the list, otherwise set 'referenced' flag.1561 *1562 * Called under dentry->d_lock.1563 */1564void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di)1565{1566 struct dentry *dn = di->dentry;1567 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc;1568 struct ceph_client *cl = mdsc->fsc->client;1569 1570 doutc(cl, "%p %p '%pd' (offset 0x%llx)\n", di, dn, dn, di->offset);1571 1572 if (!list_empty(&di->lease_list)) {1573 if (di->flags & CEPH_DENTRY_LEASE_LIST) {1574 /* don't remove dentry from dentry lease list1575 * if its lease is valid */1576 if (__dentry_lease_is_valid(di))1577 return;1578 } else {1579 di->flags |= CEPH_DENTRY_REFERENCED;1580 return;1581 }1582 }1583 1584 if (di->flags & CEPH_DENTRY_SHRINK_LIST) {1585 di->flags |= CEPH_DENTRY_REFERENCED;1586 di->flags &= ~CEPH_DENTRY_LEASE_LIST;1587 return;1588 }1589 1590 spin_lock(&mdsc->dentry_list_lock);1591 __dentry_dir_lease_touch(mdsc, di);1592 spin_unlock(&mdsc->dentry_list_lock);1593}1594 1595static void __dentry_lease_unlist(struct ceph_dentry_info *di)1596{1597 struct ceph_mds_client *mdsc;1598 if (di->flags & CEPH_DENTRY_SHRINK_LIST)1599 return;1600 if (list_empty(&di->lease_list))1601 return;1602 1603 mdsc = ceph_sb_to_fs_client(di->dentry->d_sb)->mdsc;1604 spin_lock(&mdsc->dentry_list_lock);1605 list_del_init(&di->lease_list);1606 spin_unlock(&mdsc->dentry_list_lock);1607}1608 1609enum {1610 KEEP = 0,1611 DELETE = 1,1612 TOUCH = 2,1613 STOP = 4,1614};1615 1616struct ceph_lease_walk_control {1617 bool dir_lease;1618 bool expire_dir_lease;1619 unsigned long nr_to_scan;1620 unsigned long dir_lease_ttl;1621};1622 1623static int __dir_lease_check(const struct dentry *, struct ceph_lease_walk_control *);1624static int __dentry_lease_check(const struct dentry *);1625 1626static unsigned long1627__dentry_leases_walk(struct ceph_mds_client *mdsc,1628 struct ceph_lease_walk_control *lwc)1629{1630 struct ceph_dentry_info *di, *tmp;1631 struct dentry *dentry, *last = NULL;1632 struct list_head* list;1633 LIST_HEAD(dispose);1634 unsigned long freed = 0;1635 int ret = 0;1636 1637 list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases;1638 spin_lock(&mdsc->dentry_list_lock);1639 list_for_each_entry_safe(di, tmp, list, lease_list) {1640 if (!lwc->nr_to_scan)1641 break;1642 --lwc->nr_to_scan;1643 1644 dentry = di->dentry;1645 if (last == dentry)1646 break;1647 1648 if (!spin_trylock(&dentry->d_lock))1649 continue;1650 1651 if (__lockref_is_dead(&dentry->d_lockref)) {1652 list_del_init(&di->lease_list);1653 goto next;1654 }1655 1656 if (lwc->dir_lease)1657 ret = __dir_lease_check(dentry, lwc);1658 else1659 ret = __dentry_lease_check(dentry);1660 if (ret & TOUCH) {1661 /* move it into tail of dir lease list */1662 __dentry_dir_lease_touch(mdsc, di);1663 if (!last)1664 last = dentry;1665 }1666 if (ret & DELETE) {1667 /* stale lease */1668 di->flags &= ~CEPH_DENTRY_REFERENCED;1669 if (dentry->d_lockref.count > 0) {1670 /* update_dentry_lease() will re-add1671 * it to lease list, or1672 * ceph_d_delete() will return 1 when1673 * last reference is dropped */1674 list_del_init(&di->lease_list);1675 } else {1676 di->flags |= CEPH_DENTRY_SHRINK_LIST;1677 list_move_tail(&di->lease_list, &dispose);1678 dget_dlock(dentry);1679 }1680 }1681next:1682 spin_unlock(&dentry->d_lock);1683 if (ret & STOP)1684 break;1685 }1686 spin_unlock(&mdsc->dentry_list_lock);1687 1688 while (!list_empty(&dispose)) {1689 di = list_first_entry(&dispose, struct ceph_dentry_info,1690 lease_list);1691 dentry = di->dentry;1692 spin_lock(&dentry->d_lock);1693 1694 list_del_init(&di->lease_list);1695 di->flags &= ~CEPH_DENTRY_SHRINK_LIST;1696 if (di->flags & CEPH_DENTRY_REFERENCED) {1697 spin_lock(&mdsc->dentry_list_lock);1698 if (di->flags & CEPH_DENTRY_LEASE_LIST) {1699 list_add_tail(&di->lease_list,1700 &mdsc->dentry_leases);1701 } else {1702 __dentry_dir_lease_touch(mdsc, di);1703 }1704 spin_unlock(&mdsc->dentry_list_lock);1705 } else {1706 freed++;1707 }1708 1709 spin_unlock(&dentry->d_lock);1710 /* ceph_d_delete() does the trick */1711 dput(dentry);1712 }1713 return freed;1714}1715 1716static int __dentry_lease_check(const struct dentry *dentry)1717{1718 struct ceph_dentry_info *di = ceph_dentry(dentry);1719 int ret;1720 1721 if (__dentry_lease_is_valid(di))1722 return STOP;1723 ret = __dir_lease_try_check(dentry);1724 if (ret == -EBUSY)1725 return KEEP;1726 if (ret > 0)1727 return TOUCH;1728 return DELETE;1729}1730 1731static int __dir_lease_check(const struct dentry *dentry,1732 struct ceph_lease_walk_control *lwc)1733{1734 struct ceph_dentry_info *di = ceph_dentry(dentry);1735 1736 int ret = __dir_lease_try_check(dentry);1737 if (ret == -EBUSY)1738 return KEEP;1739 if (ret > 0) {1740 if (time_before(jiffies, di->time + lwc->dir_lease_ttl))1741 return STOP;1742 /* Move dentry to tail of dir lease list if we don't want1743 * to delete it. So dentries in the list are checked in a1744 * round robin manner */1745 if (!lwc->expire_dir_lease)1746 return TOUCH;1747 if (dentry->d_lockref.count > 0 ||1748 (di->flags & CEPH_DENTRY_REFERENCED))1749 return TOUCH;1750 /* invalidate dir lease */1751 di->lease_shared_gen = 0;1752 }1753 return DELETE;1754}1755 1756int ceph_trim_dentries(struct ceph_mds_client *mdsc)1757{1758 struct ceph_lease_walk_control lwc;1759 unsigned long count;1760 unsigned long freed;1761 1762 spin_lock(&mdsc->caps_list_lock);1763 if (mdsc->caps_use_max > 0 &&1764 mdsc->caps_use_count > mdsc->caps_use_max)1765 count = mdsc->caps_use_count - mdsc->caps_use_max;1766 else1767 count = 0;1768 spin_unlock(&mdsc->caps_list_lock);1769 1770 lwc.dir_lease = false;1771 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2;1772 freed = __dentry_leases_walk(mdsc, &lwc);1773 if (!lwc.nr_to_scan) /* more invalid leases */1774 return -EAGAIN;1775 1776 if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE)1777 lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;1778 1779 lwc.dir_lease = true;1780 lwc.expire_dir_lease = freed < count;1781 lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ;1782 freed +=__dentry_leases_walk(mdsc, &lwc);1783 if (!lwc.nr_to_scan) /* more to check */1784 return -EAGAIN;1785 1786 return freed > 0 ? 1 : 0;1787}1788 1789/*1790 * Ensure a dentry lease will no longer revalidate.1791 */1792void ceph_invalidate_dentry_lease(struct dentry *dentry)1793{1794 struct ceph_dentry_info *di = ceph_dentry(dentry);1795 spin_lock(&dentry->d_lock);1796 di->time = jiffies;1797 di->lease_shared_gen = 0;1798 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;1799 __dentry_lease_unlist(di);1800 spin_unlock(&dentry->d_lock);1801}1802 1803/*1804 * Check if dentry lease is valid. If not, delete the lease. Try to1805 * renew if the least is more than half up.1806 */1807static bool __dentry_lease_is_valid(struct ceph_dentry_info *di)1808{1809 struct ceph_mds_session *session;1810 1811 if (!di->lease_gen)1812 return false;1813 1814 session = di->lease_session;1815 if (session) {1816 u32 gen;1817 unsigned long ttl;1818 1819 gen = atomic_read(&session->s_cap_gen);1820 ttl = session->s_cap_ttl;1821 1822 if (di->lease_gen == gen &&1823 time_before(jiffies, ttl) &&1824 time_before(jiffies, di->time))1825 return true;1826 }1827 di->lease_gen = 0;1828 return false;1829}1830 1831static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags)1832{1833 struct ceph_dentry_info *di;1834 struct ceph_mds_session *session = NULL;1835 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc;1836 struct ceph_client *cl = mdsc->fsc->client;1837 u32 seq = 0;1838 int valid = 0;1839 1840 spin_lock(&dentry->d_lock);1841 di = ceph_dentry(dentry);1842 if (di && __dentry_lease_is_valid(di)) {1843 valid = 1;1844 1845 if (di->lease_renew_after &&1846 time_after(jiffies, di->lease_renew_after)) {1847 /*1848 * We should renew. If we're in RCU walk mode1849 * though, we can't do that so just return1850 * -ECHILD.1851 */1852 if (flags & LOOKUP_RCU) {1853 valid = -ECHILD;1854 } else {1855 session = ceph_get_mds_session(di->lease_session);1856 seq = di->lease_seq;1857 di->lease_renew_after = 0;1858 di->lease_renew_from = jiffies;1859 }1860 }1861 }1862 spin_unlock(&dentry->d_lock);1863 1864 if (session) {1865 ceph_mdsc_lease_send_msg(session, dentry,1866 CEPH_MDS_LEASE_RENEW, seq);1867 ceph_put_mds_session(session);1868 }1869 doutc(cl, "dentry %p = %d\n", dentry, valid);1870 return valid;1871}1872 1873/*1874 * Called under dentry->d_lock.1875 */1876static int __dir_lease_try_check(const struct dentry *dentry)1877{1878 struct ceph_dentry_info *di = ceph_dentry(dentry);1879 struct inode *dir;1880 struct ceph_inode_info *ci;1881 int valid = 0;1882 1883 if (!di->lease_shared_gen)1884 return 0;1885 if (IS_ROOT(dentry))1886 return 0;1887 1888 dir = d_inode(dentry->d_parent);1889 ci = ceph_inode(dir);1890 1891 if (spin_trylock(&ci->i_ceph_lock)) {1892 if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen &&1893 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0))1894 valid = 1;1895 spin_unlock(&ci->i_ceph_lock);1896 } else {1897 valid = -EBUSY;1898 }1899 1900 if (!valid)1901 di->lease_shared_gen = 0;1902 return valid;1903}1904 1905/*1906 * Check if directory-wide content lease/cap is valid.1907 */1908static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry,1909 struct ceph_mds_client *mdsc)1910{1911 struct ceph_inode_info *ci = ceph_inode(dir);1912 struct ceph_client *cl = mdsc->fsc->client;1913 int valid;1914 int shared_gen;1915 1916 spin_lock(&ci->i_ceph_lock);1917 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);1918 if (valid) {1919 __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD);1920 shared_gen = atomic_read(&ci->i_shared_gen);1921 }1922 spin_unlock(&ci->i_ceph_lock);1923 if (valid) {1924 struct ceph_dentry_info *di;1925 spin_lock(&dentry->d_lock);1926 di = ceph_dentry(dentry);1927 if (dir == d_inode(dentry->d_parent) &&1928 di && di->lease_shared_gen == shared_gen)1929 __ceph_dentry_dir_lease_touch(di);1930 else1931 valid = 0;1932 spin_unlock(&dentry->d_lock);1933 }1934 doutc(cl, "dir %p %llx.%llx v%u dentry %p '%pd' = %d\n", dir,1935 ceph_vinop(dir), (unsigned)atomic_read(&ci->i_shared_gen),1936 dentry, dentry, valid);1937 return valid;1938}1939 1940/*1941 * Check if cached dentry can be trusted.1942 */1943static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)1944{1945 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc;1946 struct ceph_client *cl = mdsc->fsc->client;1947 int valid = 0;1948 struct dentry *parent;1949 struct inode *dir, *inode;1950 1951 valid = fscrypt_d_revalidate(dentry, flags);1952 if (valid <= 0)1953 return valid;1954 1955 if (flags & LOOKUP_RCU) {1956 parent = READ_ONCE(dentry->d_parent);1957 dir = d_inode_rcu(parent);1958 if (!dir)1959 return -ECHILD;1960 inode = d_inode_rcu(dentry);1961 } else {1962 parent = dget_parent(dentry);1963 dir = d_inode(parent);1964 inode = d_inode(dentry);1965 }1966 1967 doutc(cl, "%p '%pd' inode %p offset 0x%llx nokey %d\n",1968 dentry, dentry, inode, ceph_dentry(dentry)->offset,1969 !!(dentry->d_flags & DCACHE_NOKEY_NAME));1970 1971 mdsc = ceph_sb_to_fs_client(dir->i_sb)->mdsc;1972 1973 /* always trust cached snapped dentries, snapdir dentry */1974 if (ceph_snap(dir) != CEPH_NOSNAP) {1975 doutc(cl, "%p '%pd' inode %p is SNAPPED\n", dentry,1976 dentry, inode);1977 valid = 1;1978 } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {1979 valid = 1;1980 } else {1981 valid = dentry_lease_is_valid(dentry, flags);1982 if (valid == -ECHILD)1983 return valid;1984 if (valid || dir_lease_is_valid(dir, dentry, mdsc)) {1985 if (inode)1986 valid = ceph_is_any_caps(inode);1987 else1988 valid = 1;1989 }1990 }1991 1992 if (!valid) {1993 struct ceph_mds_request *req;1994 int op, err;1995 u32 mask;1996 1997 if (flags & LOOKUP_RCU)1998 return -ECHILD;1999 2000 percpu_counter_inc(&mdsc->metric.d_lease_mis);2001 2002 op = ceph_snap(dir) == CEPH_SNAPDIR ?2003 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;2004 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);2005 if (!IS_ERR(req)) {2006 req->r_dentry = dget(dentry);2007 req->r_num_caps = 2;2008 req->r_parent = dir;2009 ihold(dir);2010 2011 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;2012 if (ceph_security_xattr_wanted(dir))2013 mask |= CEPH_CAP_XATTR_SHARED;2014 req->r_args.getattr.mask = cpu_to_le32(mask);2015 2016 err = ceph_mdsc_do_request(mdsc, NULL, req);2017 switch (err) {2018 case 0:2019 if (d_really_is_positive(dentry) &&2020 d_inode(dentry) == req->r_target_inode)2021 valid = 1;2022 break;2023 case -ENOENT:2024 if (d_really_is_negative(dentry))2025 valid = 1;2026 fallthrough;2027 default:2028 break;2029 }2030 ceph_mdsc_put_request(req);2031 doutc(cl, "%p '%pd', lookup result=%d\n", dentry,2032 dentry, err);2033 }2034 } else {2035 percpu_counter_inc(&mdsc->metric.d_lease_hit);2036 }2037 2038 doutc(cl, "%p '%pd' %s\n", dentry, dentry, valid ? "valid" : "invalid");2039 if (!valid)2040 ceph_dir_clear_complete(dir);2041 2042 if (!(flags & LOOKUP_RCU))2043 dput(parent);2044 return valid;2045}2046 2047/*2048 * Delete unused dentry that doesn't have valid lease2049 *2050 * Called under dentry->d_lock.2051 */2052static int ceph_d_delete(const struct dentry *dentry)2053{2054 struct ceph_dentry_info *di;2055 2056 /* won't release caps */2057 if (d_really_is_negative(dentry))2058 return 0;2059 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)2060 return 0;2061 /* valid lease? */2062 di = ceph_dentry(dentry);2063 if (di) {2064 if (__dentry_lease_is_valid(di))2065 return 0;2066 if (__dir_lease_try_check(dentry))2067 return 0;2068 }2069 return 1;2070}2071 2072/*2073 * Release our ceph_dentry_info.2074 */2075static void ceph_d_release(struct dentry *dentry)2076{2077 struct ceph_dentry_info *di = ceph_dentry(dentry);2078 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb);2079 2080 doutc(fsc->client, "dentry %p '%pd'\n", dentry, dentry);2081 2082 atomic64_dec(&fsc->mdsc->metric.total_dentries);2083 2084 spin_lock(&dentry->d_lock);2085 __dentry_lease_unlist(di);2086 dentry->d_fsdata = NULL;2087 spin_unlock(&dentry->d_lock);2088 2089 ceph_put_mds_session(di->lease_session);2090 kmem_cache_free(ceph_dentry_cachep, di);2091}2092 2093/*2094 * When the VFS prunes a dentry from the cache, we need to clear the2095 * complete flag on the parent directory.2096 *2097 * Called under dentry->d_lock.2098 */2099static void ceph_d_prune(struct dentry *dentry)2100{2101 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb);2102 struct ceph_client *cl = mdsc->fsc->client;2103 struct ceph_inode_info *dir_ci;2104 struct ceph_dentry_info *di;2105 2106 doutc(cl, "dentry %p '%pd'\n", dentry, dentry);2107 2108 /* do we have a valid parent? */2109 if (IS_ROOT(dentry))2110 return;2111 2112 /* we hold d_lock, so d_parent is stable */2113 dir_ci = ceph_inode(d_inode(dentry->d_parent));2114 if (dir_ci->i_vino.snap == CEPH_SNAPDIR)2115 return;2116 2117 /* who calls d_delete() should also disable dcache readdir */2118 if (d_really_is_negative(dentry))2119 return;2120 2121 /* d_fsdata does not get cleared until d_release */2122 if (!d_unhashed(dentry)) {2123 __ceph_dir_clear_complete(dir_ci);2124 return;2125 }2126 2127 /* Disable dcache readdir just in case that someone called d_drop()2128 * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED2129 * properly (dcache readdir is still enabled) */2130 di = ceph_dentry(dentry);2131 if (di->offset > 0 &&2132 di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))2133 __ceph_dir_clear_ordered(dir_ci);2134}2135 2136/*2137 * read() on a dir. This weird interface hack only works if mounted2138 * with '-o dirstat'.2139 */2140static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,2141 loff_t *ppos)2142{2143 struct ceph_dir_file_info *dfi = file->private_data;2144 struct inode *inode = file_inode(file);2145 struct ceph_inode_info *ci = ceph_inode(inode);2146 int left;2147 const int bufsize = 1024;2148 2149 if (!ceph_test_mount_opt(ceph_sb_to_fs_client(inode->i_sb), DIRSTAT))2150 return -EISDIR;2151 2152 if (!dfi->dir_info) {2153 dfi->dir_info = kmalloc(bufsize, GFP_KERNEL);2154 if (!dfi->dir_info)2155 return -ENOMEM;2156 dfi->dir_info_len =2157 snprintf(dfi->dir_info, bufsize,2158 "entries: %20lld\n"2159 " files: %20lld\n"2160 " subdirs: %20lld\n"2161 "rentries: %20lld\n"2162 " rfiles: %20lld\n"2163 " rsubdirs: %20lld\n"2164 "rbytes: %20lld\n"2165 "rctime: %10lld.%09ld\n",2166 ci->i_files + ci->i_subdirs,2167 ci->i_files,2168 ci->i_subdirs,2169 ci->i_rfiles + ci->i_rsubdirs,2170 ci->i_rfiles,2171 ci->i_rsubdirs,2172 ci->i_rbytes,2173 ci->i_rctime.tv_sec,2174 ci->i_rctime.tv_nsec);2175 }2176 2177 if (*ppos >= dfi->dir_info_len)2178 return 0;2179 size = min_t(unsigned, size, dfi->dir_info_len-*ppos);2180 left = copy_to_user(buf, dfi->dir_info + *ppos, size);2181 if (left == size)2182 return -EFAULT;2183 *ppos += (size - left);2184 return size - left;2185}2186 2187 2188 2189/*2190 * Return name hash for a given dentry. This is dependent on2191 * the parent directory's hash function.2192 */2193unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)2194{2195 struct ceph_inode_info *dci = ceph_inode(dir);2196 unsigned hash;2197 2198 switch (dci->i_dir_layout.dl_dir_hash) {2199 case 0: /* for backward compat */2200 case CEPH_STR_HASH_LINUX:2201 return dn->d_name.hash;2202 2203 default:2204 spin_lock(&dn->d_lock);2205 hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash,2206 dn->d_name.name, dn->d_name.len);2207 spin_unlock(&dn->d_lock);2208 return hash;2209 }2210}2211 2212WRAP_DIR_ITER(ceph_readdir) // FIXME!2213const struct file_operations ceph_dir_fops = {2214 .read = ceph_read_dir,2215 .iterate_shared = shared_ceph_readdir,2216 .llseek = ceph_dir_llseek,2217 .open = ceph_open,2218 .release = ceph_release,2219 .unlocked_ioctl = ceph_ioctl,2220 .compat_ioctl = compat_ptr_ioctl,2221 .fsync = ceph_fsync,2222 .lock = ceph_lock,2223 .flock = ceph_flock,2224};2225 2226const struct file_operations ceph_snapdir_fops = {2227 .iterate_shared = shared_ceph_readdir,2228 .llseek = ceph_dir_llseek,2229 .open = ceph_open,2230 .release = ceph_release,2231};2232 2233const struct inode_operations ceph_dir_iops = {2234 .lookup = ceph_lookup,2235 .permission = ceph_permission,2236 .getattr = ceph_getattr,2237 .setattr = ceph_setattr,2238 .listxattr = ceph_listxattr,2239 .get_inode_acl = ceph_get_acl,2240 .set_acl = ceph_set_acl,2241 .mknod = ceph_mknod,2242 .symlink = ceph_symlink,2243 .mkdir = ceph_mkdir,2244 .link = ceph_link,2245 .unlink = ceph_unlink,2246 .rmdir = ceph_unlink,2247 .rename = ceph_rename,2248 .create = ceph_create,2249 .atomic_open = ceph_atomic_open,2250};2251 2252const struct inode_operations ceph_snapdir_iops = {2253 .lookup = ceph_lookup,2254 .permission = ceph_permission,2255 .getattr = ceph_getattr,2256 .mkdir = ceph_mkdir,2257 .rmdir = ceph_unlink,2258 .rename = ceph_rename,2259};2260 2261const struct dentry_operations ceph_dentry_ops = {2262 .d_revalidate = ceph_d_revalidate,2263 .d_delete = ceph_d_delete,2264 .d_release = ceph_d_release,2265 .d_prune = ceph_d_prune,2266 .d_init = ceph_d_init,2267};2268