12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 31da177e4SLinus Torvalds * 4f3ddee8dSDavid Howells * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. 51da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #include <linux/kernel.h> 91da177e4SLinus Torvalds #include <linux/fs.h> 1034286d66SNick Piggin #include <linux/namei.h> 111da177e4SLinus Torvalds #include <linux/pagemap.h> 12f3ddee8dSDavid Howells #include <linux/swap.h> 1300d3b7a4SDavid Howells #include <linux/ctype.h> 14e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 15f3ddee8dSDavid Howells #include <linux/task_io_accounting_ops.h> 161da177e4SLinus Torvalds #include "internal.h" 17a58823acSDavid Howells #include "afs_fs.h" 184ea219a8SDavid Howells #include "xdr_fs.h" 191da177e4SLinus Torvalds 20260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2100cd8dd3SAl Viro unsigned int flags); 221da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 231bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 240b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 25fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 2679ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode); 275cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 285cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 29ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 30afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 31549c7297SChristian Brauner static int afs_create(struct user_namespace *mnt_userns, struct inode *dir, 32549c7297SChristian Brauner struct dentry *dentry, umode_t mode, bool excl); 33549c7297SChristian Brauner static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 34549c7297SChristian Brauner struct dentry *dentry, umode_t mode); 35260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 37260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 38260a9803SDavid Howells struct dentry *dentry); 39549c7297SChristian Brauner static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 40549c7297SChristian Brauner struct dentry *dentry, const char *content); 41549c7297SChristian Brauner static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 42549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir, 43549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags); 44508cae68SMatthew Wilcox (Oracle) static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags); 45f6bc6fb8SMatthew Wilcox (Oracle) static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, 46f6bc6fb8SMatthew Wilcox (Oracle) size_t length); 47f3ddee8dSDavid Howells 48d7c994b3SMatthew Wilcox (Oracle) static bool afs_dir_dirty_folio(struct address_space *mapping, 49d7c994b3SMatthew Wilcox (Oracle) struct folio *folio) 50f3ddee8dSDavid Howells { 51f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 52f3ddee8dSDavid Howells } 531da177e4SLinus Torvalds 544b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 551da177e4SLinus Torvalds .open = afs_dir_open, 5600d3b7a4SDavid Howells .release = afs_release, 5729884effSAl Viro .iterate_shared = afs_readdir, 58e8d6c554SDavid Howells .lock = afs_lock, 593222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 601da177e4SLinus Torvalds }; 611da177e4SLinus Torvalds 62754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 63260a9803SDavid Howells .create = afs_create, 64260a9803SDavid Howells .lookup = afs_lookup, 65260a9803SDavid Howells .link = afs_link, 66260a9803SDavid Howells .unlink = afs_unlink, 67260a9803SDavid Howells .symlink = afs_symlink, 68260a9803SDavid Howells .mkdir = afs_mkdir, 69260a9803SDavid Howells .rmdir = afs_rmdir, 702773bf00SMiklos Szeredi .rename = afs_rename, 7100d3b7a4SDavid Howells .permission = afs_permission, 72416351f2SDavid Howells .getattr = afs_getattr, 7331143d5dSDavid Howells .setattr = afs_setattr, 741da177e4SLinus Torvalds }; 751da177e4SLinus Torvalds 76f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 77d7c994b3SMatthew Wilcox (Oracle) .dirty_folio = afs_dir_dirty_folio, 78508cae68SMatthew Wilcox (Oracle) .release_folio = afs_dir_release_folio, 79f6bc6fb8SMatthew Wilcox (Oracle) .invalidate_folio = afs_dir_invalidate_folio, 80f3ddee8dSDavid Howells }; 81f3ddee8dSDavid Howells 82d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 831da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 841da177e4SLinus Torvalds .d_delete = afs_d_delete, 85260a9803SDavid Howells .d_release = afs_d_release, 86d18610b0SDavid Howells .d_automount = afs_d_automount, 8779ddbfa5SDavid Howells .d_iput = afs_d_iput, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 905cf9dd55SDavid Howells struct afs_lookup_one_cookie { 915cf9dd55SDavid Howells struct dir_context ctx; 925cf9dd55SDavid Howells struct qstr name; 935cf9dd55SDavid Howells bool found; 945cf9dd55SDavid Howells struct afs_fid fid; 955cf9dd55SDavid Howells }; 965cf9dd55SDavid Howells 97260a9803SDavid Howells struct afs_lookup_cookie { 981bbae9f8SAl Viro struct dir_context ctx; 991bbae9f8SAl Viro struct qstr name; 1005cf9dd55SDavid Howells bool found; 1015cf9dd55SDavid Howells bool one_only; 1025cf9dd55SDavid Howells unsigned short nr_fids; 1035cf9dd55SDavid Howells struct afs_fid fids[50]; 1041da177e4SLinus Torvalds }; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* 107255ed636SDavid Howells * Drop the refs that we're holding on the folios we were reading into. We've 108c4508464SDavid Howells * got refs on the first nr_pages pages. 109c4508464SDavid Howells */ 110c4508464SDavid Howells static void afs_dir_read_cleanup(struct afs_read *req) 111c4508464SDavid Howells { 112c4508464SDavid Howells struct address_space *mapping = req->vnode->vfs_inode.i_mapping; 113255ed636SDavid Howells struct folio *folio; 114c4508464SDavid Howells pgoff_t last = req->nr_pages - 1; 115c4508464SDavid Howells 116c4508464SDavid Howells XA_STATE(xas, &mapping->i_pages, 0); 117c4508464SDavid Howells 118c4508464SDavid Howells if (unlikely(!req->nr_pages)) 119c4508464SDavid Howells return; 120c4508464SDavid Howells 121c4508464SDavid Howells rcu_read_lock(); 122255ed636SDavid Howells xas_for_each(&xas, folio, last) { 123255ed636SDavid Howells if (xas_retry(&xas, folio)) 124c4508464SDavid Howells continue; 125255ed636SDavid Howells BUG_ON(xa_is_value(folio)); 126255ed636SDavid Howells ASSERTCMP(folio_file_mapping(folio), ==, mapping); 127c4508464SDavid Howells 128255ed636SDavid Howells folio_put(folio); 129c4508464SDavid Howells } 130c4508464SDavid Howells 131c4508464SDavid Howells rcu_read_unlock(); 132c4508464SDavid Howells } 133c4508464SDavid Howells 134c4508464SDavid Howells /* 135255ed636SDavid Howells * check that a directory folio is valid 1361da177e4SLinus Torvalds */ 137255ed636SDavid Howells static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio, 138f3ddee8dSDavid Howells loff_t i_size) 1391da177e4SLinus Torvalds { 140255ed636SDavid Howells union afs_xdr_dir_block *block; 141255ed636SDavid Howells size_t offset, size; 142255ed636SDavid Howells loff_t pos; 1431da177e4SLinus Torvalds 144255ed636SDavid Howells /* Determine how many magic numbers there should be in this folio, but 145dab17c1aSDavid Howells * we must take care because the directory may change size under us. 146dab17c1aSDavid Howells */ 147255ed636SDavid Howells pos = folio_pos(folio); 148255ed636SDavid Howells if (i_size <= pos) 149dab17c1aSDavid Howells goto checked; 150dab17c1aSDavid Howells 151255ed636SDavid Howells size = min_t(loff_t, folio_size(folio), i_size - pos); 152255ed636SDavid Howells for (offset = 0; offset < size; offset += sizeof(*block)) { 153255ed636SDavid Howells block = kmap_local_folio(folio, offset); 154255ed636SDavid Howells if (block->hdr.magic != AFS_DIR_MAGIC) { 155255ed636SDavid Howells printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n", 156255ed636SDavid Howells __func__, dvnode->vfs_inode.i_ino, 157255ed636SDavid Howells pos, offset, size, ntohs(block->hdr.magic)); 158255ed636SDavid Howells trace_afs_dir_check_failed(dvnode, pos + offset, i_size); 159255ed636SDavid Howells kunmap_local(block); 160f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1611da177e4SLinus Torvalds goto error; 1621da177e4SLinus Torvalds } 16363a4681fSDavid Howells 16463a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 165255ed636SDavid Howells * use string functions on it. The filenames in the folio 16663a4681fSDavid Howells * *should* be NUL-terminated anyway. 16763a4681fSDavid Howells */ 168255ed636SDavid Howells ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0; 169255ed636SDavid Howells 170255ed636SDavid Howells kunmap_local(block); 1711da177e4SLinus Torvalds } 172dab17c1aSDavid Howells checked: 173f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 174be5b82dbSAl Viro return true; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds error: 177be5b82dbSAl Viro return false; 178ec26815aSDavid Howells } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* 181c4508464SDavid Howells * Dump the contents of a directory. 182445b1028SDavid Howells */ 183c4508464SDavid Howells static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req) 184445b1028SDavid Howells { 185255ed636SDavid Howells union afs_xdr_dir_block *block; 186c4508464SDavid Howells struct address_space *mapping = dvnode->vfs_inode.i_mapping; 187255ed636SDavid Howells struct folio *folio; 188c4508464SDavid Howells pgoff_t last = req->nr_pages - 1; 189255ed636SDavid Howells size_t offset, size; 190445b1028SDavid Howells 191c4508464SDavid Howells XA_STATE(xas, &mapping->i_pages, 0); 192445b1028SDavid Howells 193c4508464SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n", 194445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 195c4508464SDavid Howells req->file_size, req->len, req->actual_len); 196c4508464SDavid Howells pr_warn("DIR %llx %x %zx %zx\n", 197c4508464SDavid Howells req->pos, req->nr_pages, 198c4508464SDavid Howells req->iter->iov_offset, iov_iter_count(req->iter)); 199445b1028SDavid Howells 200255ed636SDavid Howells xas_for_each(&xas, folio, last) { 201255ed636SDavid Howells if (xas_retry(&xas, folio)) 202c4508464SDavid Howells continue; 203445b1028SDavid Howells 204255ed636SDavid Howells BUG_ON(folio_file_mapping(folio) != mapping); 205c4508464SDavid Howells 206255ed636SDavid Howells size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio)); 207255ed636SDavid Howells for (offset = 0; offset < size; offset += sizeof(*block)) { 208255ed636SDavid Howells block = kmap_local_folio(folio, offset); 209255ed636SDavid Howells pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block); 210255ed636SDavid Howells kunmap_local(block); 211445b1028SDavid Howells } 212445b1028SDavid Howells } 213c4508464SDavid Howells } 214c4508464SDavid Howells 215c4508464SDavid Howells /* 216255ed636SDavid Howells * Check all the blocks in a directory. All the folios are held pinned. 217c4508464SDavid Howells */ 218c4508464SDavid Howells static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req) 219c4508464SDavid Howells { 220c4508464SDavid Howells struct address_space *mapping = dvnode->vfs_inode.i_mapping; 221255ed636SDavid Howells struct folio *folio; 222c4508464SDavid Howells pgoff_t last = req->nr_pages - 1; 223c4508464SDavid Howells int ret = 0; 224c4508464SDavid Howells 225c4508464SDavid Howells XA_STATE(xas, &mapping->i_pages, 0); 226c4508464SDavid Howells 227c4508464SDavid Howells if (unlikely(!req->nr_pages)) 228c4508464SDavid Howells return 0; 229c4508464SDavid Howells 230c4508464SDavid Howells rcu_read_lock(); 231255ed636SDavid Howells xas_for_each(&xas, folio, last) { 232255ed636SDavid Howells if (xas_retry(&xas, folio)) 233c4508464SDavid Howells continue; 234c4508464SDavid Howells 235255ed636SDavid Howells BUG_ON(folio_file_mapping(folio) != mapping); 236c4508464SDavid Howells 237255ed636SDavid Howells if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) { 238c4508464SDavid Howells afs_dir_dump(dvnode, req); 239c4508464SDavid Howells ret = -EIO; 240c4508464SDavid Howells break; 241c4508464SDavid Howells } 242c4508464SDavid Howells } 243c4508464SDavid Howells 244c4508464SDavid Howells rcu_read_unlock(); 245c4508464SDavid Howells return ret; 246445b1028SDavid Howells } 247445b1028SDavid Howells 248445b1028SDavid Howells /* 2491da177e4SLinus Torvalds * open an AFS directory file 2501da177e4SLinus Torvalds */ 2511da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2521da177e4SLinus Torvalds { 2531da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2541da177e4SLinus Torvalds 25500317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 25600317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2571da177e4SLinus Torvalds 25808e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2591da177e4SLinus Torvalds return -ENOENT; 2601da177e4SLinus Torvalds 26100d3b7a4SDavid Howells return afs_open(inode, file); 262ec26815aSDavid Howells } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds /* 265f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 266255ed636SDavid Howells * contents. The list of folios is returned, pinning them so that they don't 267f3ddee8dSDavid Howells * get reclaimed during the iteration. 268f3ddee8dSDavid Howells */ 269f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 270b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 271f3ddee8dSDavid Howells { 272255ed636SDavid Howells struct address_space *mapping = dvnode->vfs_inode.i_mapping; 273f3ddee8dSDavid Howells struct afs_read *req; 274f3ddee8dSDavid Howells loff_t i_size; 275255ed636SDavid Howells int nr_pages, i; 276c4508464SDavid Howells int ret; 277f3ddee8dSDavid Howells 278c4508464SDavid Howells _enter(""); 279f3ddee8dSDavid Howells 280c4508464SDavid Howells req = kzalloc(sizeof(*req), GFP_KERNEL); 281f3ddee8dSDavid Howells if (!req) 282f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 283f3ddee8dSDavid Howells 284f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 285c4508464SDavid Howells req->vnode = dvnode; 286c69bf479SDavid Howells req->key = key_get(key); 287c4508464SDavid Howells req->cleanup = afs_dir_read_cleanup; 288c4508464SDavid Howells 289c4508464SDavid Howells expand: 290c4508464SDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 291c4508464SDavid Howells if (i_size < 2048) { 292c4508464SDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_small); 293c4508464SDavid Howells goto error; 294c4508464SDavid Howells } 295c4508464SDavid Howells if (i_size > 2048 * 1024) { 296c4508464SDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 297c4508464SDavid Howells ret = -EFBIG; 298f3ddee8dSDavid Howells goto error; 299f3ddee8dSDavid Howells } 300f3ddee8dSDavid Howells 301c4508464SDavid Howells _enter("%llu", i_size); 302c4508464SDavid Howells 303c4508464SDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 304c4508464SDavid Howells 305c4508464SDavid Howells req->actual_len = i_size; /* May change */ 306c4508464SDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 307c4508464SDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 308c4508464SDavid Howells iov_iter_xarray(&req->def_iter, READ, &dvnode->vfs_inode.i_mapping->i_pages, 309c4508464SDavid Howells 0, i_size); 310c4508464SDavid Howells req->iter = &req->def_iter; 311c4508464SDavid Howells 312c4508464SDavid Howells /* Fill in any gaps that we might find where the memory reclaimer has 313255ed636SDavid Howells * been at work and pin all the folios. If there are any gaps, we will 314f3ddee8dSDavid Howells * need to reread the entire directory contents. 315f3ddee8dSDavid Howells */ 316c4508464SDavid Howells i = req->nr_pages; 317c4508464SDavid Howells while (i < nr_pages) { 318255ed636SDavid Howells struct folio *folio; 319c4508464SDavid Howells 320255ed636SDavid Howells folio = filemap_get_folio(mapping, i); 321255ed636SDavid Howells if (!folio) { 322f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 323f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 324f3ddee8dSDavid Howells 325f3ddee8dSDavid Howells ret = -ENOMEM; 326255ed636SDavid Howells folio = __filemap_get_folio(mapping, 327255ed636SDavid Howells i, FGP_LOCK | FGP_CREAT, 328255ed636SDavid Howells mapping->gfp_mask); 329255ed636SDavid Howells if (!folio) 330f3ddee8dSDavid Howells goto error; 331255ed636SDavid Howells folio_attach_private(folio, (void *)1); 332255ed636SDavid Howells folio_unlock(folio); 333f3ddee8dSDavid Howells } 334255ed636SDavid Howells 335255ed636SDavid Howells req->nr_pages += folio_nr_pages(folio); 336255ed636SDavid Howells i += folio_nr_pages(folio); 337c4508464SDavid Howells } 338f3ddee8dSDavid Howells 339f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 340f3ddee8dSDavid Howells * races. 341f3ddee8dSDavid Howells */ 342f3ddee8dSDavid Howells ret = -ERESTARTSYS; 343b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 344b61f7dcfSDavid Howells goto error; 345f3ddee8dSDavid Howells 346f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 347f3ddee8dSDavid Howells goto success; 348f3ddee8dSDavid Howells 349b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 350b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 351b61f7dcfSDavid Howells goto error; 352b61f7dcfSDavid Howells 353b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 35499987c56SDavid Howells trace_afs_reload_dir(dvnode); 355c69bf479SDavid Howells ret = afs_fetch_data(dvnode, req); 356f3ddee8dSDavid Howells if (ret < 0) 357b61f7dcfSDavid Howells goto error_unlock; 358f3ddee8dSDavid Howells 359f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 360f3ddee8dSDavid Howells 361c4508464SDavid Howells if (req->len < req->file_size) { 362c4508464SDavid Howells /* The content has grown, so we need to expand the 363c4508464SDavid Howells * buffer. 364c4508464SDavid Howells */ 365c4508464SDavid Howells up_write(&dvnode->validate_lock); 366c4508464SDavid Howells goto expand; 367c4508464SDavid Howells } 368f3ddee8dSDavid Howells 369f3ddee8dSDavid Howells /* Validate the data we just read. */ 370c4508464SDavid Howells ret = afs_dir_check(dvnode, req); 371c4508464SDavid Howells if (ret < 0) 372b61f7dcfSDavid Howells goto error_unlock; 373f3ddee8dSDavid Howells 374f3ddee8dSDavid Howells // TODO: Trim excess pages 375f3ddee8dSDavid Howells 376f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 377f3ddee8dSDavid Howells } 378f3ddee8dSDavid Howells 379b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 380f3ddee8dSDavid Howells success: 381f3ddee8dSDavid Howells return req; 382f3ddee8dSDavid Howells 383f3ddee8dSDavid Howells error_unlock: 384b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 385f3ddee8dSDavid Howells error: 386f3ddee8dSDavid Howells afs_put_read(req); 387f3ddee8dSDavid Howells _leave(" = %d", ret); 388f3ddee8dSDavid Howells return ERR_PTR(ret); 389f3ddee8dSDavid Howells } 390f3ddee8dSDavid Howells 391f3ddee8dSDavid Howells /* 3921da177e4SLinus Torvalds * deal with one block in an AFS directory 3931da177e4SLinus Torvalds */ 394f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 395f51375cdSDavid Howells struct dir_context *ctx, 39600317636SDavid Howells union afs_xdr_dir_block *block, 3971bbae9f8SAl Viro unsigned blkoff) 3981da177e4SLinus Torvalds { 39900317636SDavid Howells union afs_xdr_dirent *dire; 400366911cdSDavid Howells unsigned offset, next, curr, nr_slots; 4011da177e4SLinus Torvalds size_t nlen; 4021bbae9f8SAl Viro int tmp; 4031da177e4SLinus Torvalds 404255ed636SDavid Howells _enter("%llx,%x", ctx->pos, blkoff); 4051da177e4SLinus Torvalds 40600317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 4094ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 4104ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 4111da177e4SLinus Torvalds offset = next 4121da177e4SLinus Torvalds ) { 4131da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 41400317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 4151da177e4SLinus Torvalds (1 << (offset % 8)))) { 4165b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 41700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 418366911cdSDavid Howells next = offset + 1; 4191da177e4SLinus Torvalds if (offset >= curr) 4201bbae9f8SAl Viro ctx->pos = blkoff + 42100317636SDavid Howells next * sizeof(union afs_xdr_dirent); 4221da177e4SLinus Torvalds continue; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds /* got a valid entry */ 4261da177e4SLinus Torvalds dire = &block->dirents[offset]; 4271da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 4281da177e4SLinus Torvalds sizeof(*block) - 42900317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 430366911cdSDavid Howells if (nlen > AFSNAMEMAX - 1) { 431366911cdSDavid Howells _debug("ENT[%zu]: name too long (len %u/%zu)", 432366911cdSDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 433366911cdSDavid Howells offset, nlen); 434366911cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_name_too_long); 435366911cdSDavid Howells } 4361da177e4SLinus Torvalds 4375b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 43800317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 4391da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 4401da177e4SLinus Torvalds nlen, dire->u.name); 4411da177e4SLinus Torvalds 442366911cdSDavid Howells nr_slots = afs_dir_calc_slots(nlen); 443366911cdSDavid Howells next = offset + nr_slots; 444366911cdSDavid Howells if (next > AFS_DIR_SLOTS_PER_BLOCK) { 4455b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 446366911cdSDavid Howells " %u extends beyond end dir block" 447366911cdSDavid Howells " (len %zu)", 44800317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 449366911cdSDavid Howells offset, next, nlen); 450f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4511da177e4SLinus Torvalds } 452366911cdSDavid Howells 453366911cdSDavid Howells /* Check that the name-extension dirents are all allocated */ 454366911cdSDavid Howells for (tmp = 1; tmp < nr_slots; tmp++) { 455366911cdSDavid Howells unsigned int ix = offset + tmp; 456366911cdSDavid Howells if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) { 457366911cdSDavid Howells _debug("ENT[%zu.u]:" 458366911cdSDavid Howells " %u unmarked extension (%u/%u)", 45900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 460366911cdSDavid Howells offset, tmp, nr_slots); 461f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds /* skip if starts before the current position */ 466*17eabd42SDavid Howells if (offset < curr) { 467*17eabd42SDavid Howells if (next > curr) 468*17eabd42SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4691da177e4SLinus Torvalds continue; 470*17eabd42SDavid Howells } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* found the next entry */ 4731bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4741da177e4SLinus Torvalds ntohl(dire->u.vnode), 4755cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4765cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4771bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4781da177e4SLinus Torvalds _leave(" = 0 [full]"); 4791da177e4SLinus Torvalds return 0; 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds 48200317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds _leave(" = 1 [more]"); 4861da177e4SLinus Torvalds return 1; 487ec26815aSDavid Howells } 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds /* 49008e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4911da177e4SLinus Torvalds */ 4921bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4939dd0b82eSDavid Howells struct key *key, afs_dataversion_t *_dir_version) 4941da177e4SLinus Torvalds { 495f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 49600317636SDavid Howells union afs_xdr_dir_block *dblock; 497f3ddee8dSDavid Howells struct afs_read *req; 498255ed636SDavid Howells struct folio *folio; 499255ed636SDavid Howells unsigned offset, size; 5001da177e4SLinus Torvalds int ret; 5011da177e4SLinus Torvalds 5021bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 5031da177e4SLinus Torvalds 50408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 5051da177e4SLinus Torvalds _leave(" = -ESTALE"); 5061da177e4SLinus Torvalds return -ESTALE; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 509f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 510f3ddee8dSDavid Howells if (IS_ERR(req)) 511f3ddee8dSDavid Howells return PTR_ERR(req); 5129dd0b82eSDavid Howells *_dir_version = req->data_version; 513f3ddee8dSDavid Howells 5141da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 51500317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 51600317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds /* walk through the blocks in sequence */ 5191da177e4SLinus Torvalds ret = 0; 520f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 521255ed636SDavid Howells /* Fetch the appropriate folio from the directory and re-add it 522c4508464SDavid Howells * to the LRU. We have all the pages pinned with an extra ref. 523f3ddee8dSDavid Howells */ 524255ed636SDavid Howells folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE, 525255ed636SDavid Howells FGP_ACCESSED, 0); 526255ed636SDavid Howells if (!folio) { 527f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 5281da177e4SLinus Torvalds break; 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 531255ed636SDavid Howells offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio); 532255ed636SDavid Howells size = min_t(loff_t, folio_size(folio), 533255ed636SDavid Howells req->actual_len - folio_file_pos(folio)); 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds do { 536255ed636SDavid Howells dblock = kmap_local_folio(folio, offset); 537255ed636SDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, 538255ed636SDavid Howells folio_file_pos(folio) + offset); 539255ed636SDavid Howells kunmap_local(dblock); 540255ed636SDavid Howells if (ret != 1) 5411da177e4SLinus Torvalds goto out; 5421da177e4SLinus Torvalds 543255ed636SDavid Howells } while (offset += sizeof(*dblock), offset < size); 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds ret = 0; 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds out: 549b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 550f3ddee8dSDavid Howells afs_put_read(req); 5511da177e4SLinus Torvalds _leave(" = %d", ret); 5521da177e4SLinus Torvalds return ret; 553ec26815aSDavid Howells } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* 5561da177e4SLinus Torvalds * read an AFS directory 5571da177e4SLinus Torvalds */ 5581bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5591da177e4SLinus Torvalds { 5609dd0b82eSDavid Howells afs_dataversion_t dir_version; 5619dd0b82eSDavid Howells 5629dd0b82eSDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 5639dd0b82eSDavid Howells &dir_version); 564ec26815aSDavid Howells } 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds /* 5675cf9dd55SDavid Howells * Search the directory for a single name 5681da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5691da177e4SLinus Torvalds * uniquifier through dtype 5701da177e4SLinus Torvalds */ 5715cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 572ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5731da177e4SLinus Torvalds { 5745cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5755cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5761da177e4SLinus Torvalds 5771bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5781bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 579ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5801da177e4SLinus Torvalds 58108e0e7c8SDavid Howells /* insanity checks first */ 58200317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 58300317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 58408e0e7c8SDavid Howells 5851bbae9f8SAl Viro if (cookie->name.len != nlen || 5861bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5871da177e4SLinus Torvalds _leave(" = 0 [no]"); 5881da177e4SLinus Torvalds return 0; 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds cookie->fid.vnode = ino; 5921da177e4SLinus Torvalds cookie->fid.unique = dtype; 5931da177e4SLinus Torvalds cookie->found = 1; 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds _leave(" = -1 [found]"); 5961da177e4SLinus Torvalds return -1; 597ec26815aSDavid Howells } 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds /* 6005cf9dd55SDavid Howells * Do a lookup of a single name in a directory 601260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 6021da177e4SLinus Torvalds */ 6035cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 6049dd0b82eSDavid Howells struct afs_fid *fid, struct key *key, 6059dd0b82eSDavid Howells afs_dataversion_t *_dir_version) 6061da177e4SLinus Torvalds { 6071bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 6085cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 6095cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 6101bbae9f8SAl Viro .name = dentry->d_name, 6111bbae9f8SAl Viro .fid.vid = as->volume->vid 6121bbae9f8SAl Viro }; 6131da177e4SLinus Torvalds int ret; 6141da177e4SLinus Torvalds 615a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds /* search the directory */ 6189dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 6191da177e4SLinus Torvalds if (ret < 0) { 62008e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 62108e0e7c8SDavid Howells return ret; 6221da177e4SLinus Torvalds } 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds if (!cookie.found) { 62508e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 62608e0e7c8SDavid Howells return -ENOENT; 62708e0e7c8SDavid Howells } 62808e0e7c8SDavid Howells 62908e0e7c8SDavid Howells *fid = cookie.fid; 6303b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 63108e0e7c8SDavid Howells return 0; 63208e0e7c8SDavid Howells } 63308e0e7c8SDavid Howells 63408e0e7c8SDavid Howells /* 6355cf9dd55SDavid Howells * search the directory for a name 6365cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 6375cf9dd55SDavid Howells * uniquifier through dtype 6385cf9dd55SDavid Howells */ 6395cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 6405cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 6415cf9dd55SDavid Howells { 6425cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6435cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6445cf9dd55SDavid Howells int ret; 6455cf9dd55SDavid Howells 6465cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6475cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6485cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6495cf9dd55SDavid Howells 6505cf9dd55SDavid Howells /* insanity checks first */ 65100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 65200317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6535cf9dd55SDavid Howells 6545cf9dd55SDavid Howells if (cookie->found) { 6555cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6565cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6575cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6585cf9dd55SDavid Howells cookie->nr_fids++; 6595cf9dd55SDavid Howells } 6605cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6615cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 662e49c7b2fSDavid Howells cookie->fids[1].vnode = ino; 663e49c7b2fSDavid Howells cookie->fids[1].unique = dtype; 6645cf9dd55SDavid Howells cookie->found = 1; 6655cf9dd55SDavid Howells if (cookie->one_only) 6665cf9dd55SDavid Howells return -1; 6675cf9dd55SDavid Howells } 6685cf9dd55SDavid Howells 6695cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6705cf9dd55SDavid Howells _leave(" = %d", ret); 6715cf9dd55SDavid Howells return ret; 6725cf9dd55SDavid Howells } 6735cf9dd55SDavid Howells 6745cf9dd55SDavid Howells /* 675e49c7b2fSDavid Howells * Deal with the result of a successful lookup operation. Turn all the files 676e49c7b2fSDavid Howells * into inodes and save the first one - which is the one we actually want. 677e49c7b2fSDavid Howells */ 678e49c7b2fSDavid Howells static void afs_do_lookup_success(struct afs_operation *op) 679e49c7b2fSDavid Howells { 680e49c7b2fSDavid Howells struct afs_vnode_param *vp; 681e49c7b2fSDavid Howells struct afs_vnode *vnode; 682e49c7b2fSDavid Howells struct inode *inode; 683e49c7b2fSDavid Howells u32 abort_code; 684e49c7b2fSDavid Howells int i; 685e49c7b2fSDavid Howells 686e49c7b2fSDavid Howells _enter(""); 687e49c7b2fSDavid Howells 688e49c7b2fSDavid Howells for (i = 0; i < op->nr_files; i++) { 689e49c7b2fSDavid Howells switch (i) { 690e49c7b2fSDavid Howells case 0: 691e49c7b2fSDavid Howells vp = &op->file[0]; 692e49c7b2fSDavid Howells abort_code = vp->scb.status.abort_code; 693e49c7b2fSDavid Howells if (abort_code != 0) { 69444767c35SDavid Howells op->ac.abort_code = abort_code; 695e49c7b2fSDavid Howells op->error = afs_abort_to_error(abort_code); 696e49c7b2fSDavid Howells } 697e49c7b2fSDavid Howells break; 698e49c7b2fSDavid Howells 699e49c7b2fSDavid Howells case 1: 700e49c7b2fSDavid Howells vp = &op->file[1]; 701e49c7b2fSDavid Howells break; 702e49c7b2fSDavid Howells 703e49c7b2fSDavid Howells default: 704e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 705e49c7b2fSDavid Howells break; 706e49c7b2fSDavid Howells } 707e49c7b2fSDavid Howells 708e49c7b2fSDavid Howells if (!vp->scb.have_status && !vp->scb.have_error) 709e49c7b2fSDavid Howells continue; 710e49c7b2fSDavid Howells 711e49c7b2fSDavid Howells _debug("do [%u]", i); 712e49c7b2fSDavid Howells if (vp->vnode) { 713e49c7b2fSDavid Howells if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) 714e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 715e49c7b2fSDavid Howells } else if (vp->scb.status.abort_code == 0) { 716e49c7b2fSDavid Howells inode = afs_iget(op, vp); 717e49c7b2fSDavid Howells if (!IS_ERR(inode)) { 718e49c7b2fSDavid Howells vnode = AFS_FS_I(inode); 719e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, 720e49c7b2fSDavid Howells 0 /* Assume vnode->cb_break is 0 */ + 721e49c7b2fSDavid Howells op->cb_v_break, 722e49c7b2fSDavid Howells &vp->scb); 723e49c7b2fSDavid Howells vp->vnode = vnode; 724e49c7b2fSDavid Howells vp->put_vnode = true; 725e49c7b2fSDavid Howells } 726e49c7b2fSDavid Howells } else { 727e49c7b2fSDavid Howells _debug("- abort %d %llx:%llx.%x", 728e49c7b2fSDavid Howells vp->scb.status.abort_code, 729e49c7b2fSDavid Howells vp->fid.vid, vp->fid.vnode, vp->fid.unique); 730e49c7b2fSDavid Howells } 731e49c7b2fSDavid Howells } 732e49c7b2fSDavid Howells 733e49c7b2fSDavid Howells _leave(""); 734e49c7b2fSDavid Howells } 735e49c7b2fSDavid Howells 736e49c7b2fSDavid Howells static const struct afs_operation_ops afs_inline_bulk_status_operation = { 737e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_inline_bulk_status, 738e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_inline_bulk_status, 739e49c7b2fSDavid Howells .success = afs_do_lookup_success, 740e49c7b2fSDavid Howells }; 741e49c7b2fSDavid Howells 742b6489a49SDavid Howells static const struct afs_operation_ops afs_lookup_fetch_status_operation = { 743e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_fetch_status, 744e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_fetch_status, 745e49c7b2fSDavid Howells .success = afs_do_lookup_success, 746728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 747e49c7b2fSDavid Howells }; 748e49c7b2fSDavid Howells 749e49c7b2fSDavid Howells /* 75020325960SDavid Howells * See if we know that the server we expect to use doesn't support 75120325960SDavid Howells * FS.InlineBulkStatus. 75220325960SDavid Howells */ 75320325960SDavid Howells static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) 75420325960SDavid Howells { 75520325960SDavid Howells struct afs_server_list *slist; 75620325960SDavid Howells struct afs_volume *volume = dvnode->volume; 75720325960SDavid Howells struct afs_server *server; 75820325960SDavid Howells bool ret = true; 75920325960SDavid Howells int i; 76020325960SDavid Howells 76120325960SDavid Howells if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) 76220325960SDavid Howells return true; 76320325960SDavid Howells 76420325960SDavid Howells rcu_read_lock(); 76520325960SDavid Howells slist = rcu_dereference(volume->servers); 76620325960SDavid Howells 76720325960SDavid Howells for (i = 0; i < slist->nr_servers; i++) { 76820325960SDavid Howells server = slist->servers[i].server; 76920325960SDavid Howells if (server == dvnode->cb_server) { 77020325960SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 77120325960SDavid Howells ret = false; 77220325960SDavid Howells break; 77320325960SDavid Howells } 77420325960SDavid Howells } 77520325960SDavid Howells 77620325960SDavid Howells rcu_read_unlock(); 77720325960SDavid Howells return ret; 77820325960SDavid Howells } 77920325960SDavid Howells 78020325960SDavid Howells /* 7815cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 7825cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 7835cf9dd55SDavid Howells * asked for is returned. 7845cf9dd55SDavid Howells */ 7855cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 7865cf9dd55SDavid Howells struct key *key) 7875cf9dd55SDavid Howells { 7885cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 789e49c7b2fSDavid Howells struct afs_vnode_param *vp; 790e49c7b2fSDavid Howells struct afs_operation *op; 79139db9815SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 79239db9815SDavid Howells struct inode *inode = NULL, *ti; 7939dd0b82eSDavid Howells afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 794e49c7b2fSDavid Howells long ret; 795e49c7b2fSDavid Howells int i; 7965cf9dd55SDavid Howells 7975cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 7985cf9dd55SDavid Howells 7995cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 8005cf9dd55SDavid Howells if (!cookie) 8015cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 8025cf9dd55SDavid Howells 803e49c7b2fSDavid Howells for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) 804e49c7b2fSDavid Howells cookie->fids[i].vid = dvnode->fid.vid; 8055cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 8065cf9dd55SDavid Howells cookie->name = dentry->d_name; 80713fcc635SDavid Howells cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want 80813fcc635SDavid Howells * and slot 1 for the directory */ 8095cf9dd55SDavid Howells 81020325960SDavid Howells if (!afs_server_supports_ibulk(dvnode)) 8115cf9dd55SDavid Howells cookie->one_only = true; 8125cf9dd55SDavid Howells 8135cf9dd55SDavid Howells /* search the directory */ 8149dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 815e49c7b2fSDavid Howells if (ret < 0) 8165cf9dd55SDavid Howells goto out; 8175cf9dd55SDavid Howells 8189dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)data_version; 8199dd0b82eSDavid Howells 820e49c7b2fSDavid Howells ret = -ENOENT; 8215cf9dd55SDavid Howells if (!cookie->found) 8225cf9dd55SDavid Howells goto out; 8235cf9dd55SDavid Howells 8245cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 825e49c7b2fSDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, 826e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &cookie->fids[1]); 8275cf9dd55SDavid Howells if (inode) 828e49c7b2fSDavid Howells goto out; /* We do */ 829e49c7b2fSDavid Howells 830e49c7b2fSDavid Howells /* Okay, we didn't find it. We need to query the server - and whilst 831e49c7b2fSDavid Howells * we're doing that, we're going to attempt to look up a bunch of other 832e49c7b2fSDavid Howells * vnodes also. 833e49c7b2fSDavid Howells */ 834e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 835e49c7b2fSDavid Howells if (IS_ERR(op)) { 836e49c7b2fSDavid Howells ret = PTR_ERR(op); 8375cf9dd55SDavid Howells goto out; 838e49c7b2fSDavid Howells } 839e49c7b2fSDavid Howells 840e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 841e49c7b2fSDavid Howells afs_op_set_fid(op, 1, &cookie->fids[1]); 842e49c7b2fSDavid Howells 843e49c7b2fSDavid Howells op->nr_files = cookie->nr_fids; 844e49c7b2fSDavid Howells _debug("nr_files %u", op->nr_files); 8455cf9dd55SDavid Howells 8465cf9dd55SDavid Howells /* Need space for examining all the selected files */ 847e49c7b2fSDavid Howells op->error = -ENOMEM; 848e49c7b2fSDavid Howells if (op->nr_files > 2) { 849e49c7b2fSDavid Howells op->more_files = kvcalloc(op->nr_files - 2, 850e49c7b2fSDavid Howells sizeof(struct afs_vnode_param), 8515cf9dd55SDavid Howells GFP_KERNEL); 852e49c7b2fSDavid Howells if (!op->more_files) 853e49c7b2fSDavid Howells goto out_op; 8545cf9dd55SDavid Howells 855e49c7b2fSDavid Howells for (i = 2; i < op->nr_files; i++) { 856e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 857e49c7b2fSDavid Howells vp->fid = cookie->fids[i]; 85839db9815SDavid Howells 85939db9815SDavid Howells /* Find any inodes that already exist and get their 86039db9815SDavid Howells * callback counters. 86139db9815SDavid Howells */ 862e49c7b2fSDavid Howells ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, 863e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &vp->fid); 86439db9815SDavid Howells if (!IS_ERR_OR_NULL(ti)) { 86539db9815SDavid Howells vnode = AFS_FS_I(ti); 866e49c7b2fSDavid Howells vp->dv_before = vnode->status.data_version; 867e49c7b2fSDavid Howells vp->cb_break_before = afs_calc_vnode_cb_break(vnode); 868e49c7b2fSDavid Howells vp->vnode = vnode; 869e49c7b2fSDavid Howells vp->put_vnode = true; 870a9e5c87cSDavid Howells vp->speculative = true; /* vnode not locked */ 871e49c7b2fSDavid Howells } 87239db9815SDavid Howells } 87339db9815SDavid Howells } 87439db9815SDavid Howells 8755cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 8765cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 8775cf9dd55SDavid Howells * the whole operation. 8785cf9dd55SDavid Howells */ 879e49c7b2fSDavid Howells op->error = -ENOTSUPP; 880e49c7b2fSDavid Howells if (!cookie->one_only) { 881e49c7b2fSDavid Howells op->ops = &afs_inline_bulk_status_operation; 882e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 883e49c7b2fSDavid Howells afs_wait_for_operation(op); 8845cf9dd55SDavid Howells } 8855cf9dd55SDavid Howells 886e49c7b2fSDavid Howells if (op->error == -ENOTSUPP) { 887e49c7b2fSDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire 888e49c7b2fSDavid Howells * op if any of the lookups fails - so, for the moment, revert 889e49c7b2fSDavid Howells * to FS.FetchStatus for op->file[1]. 8905cf9dd55SDavid Howells */ 891e49c7b2fSDavid Howells op->fetch_status.which = 1; 892f8ea5c7bSDavid Howells op->ops = &afs_lookup_fetch_status_operation; 893e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 894e49c7b2fSDavid Howells afs_wait_for_operation(op); 895e49c7b2fSDavid Howells } 896e49c7b2fSDavid Howells inode = ERR_PTR(op->error); 897e49c7b2fSDavid Howells 898e49c7b2fSDavid Howells out_op: 899e49c7b2fSDavid Howells if (op->error == 0) { 900e49c7b2fSDavid Howells inode = &op->file[1].vnode->vfs_inode; 901e49c7b2fSDavid Howells op->file[1].vnode = NULL; 9025cf9dd55SDavid Howells } 9035cf9dd55SDavid Howells 904e49c7b2fSDavid Howells if (op->file[0].scb.have_status) 905e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; 906e49c7b2fSDavid Howells else 907e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; 908e49c7b2fSDavid Howells ret = afs_put_operation(op); 9095cf9dd55SDavid Howells out: 9105cf9dd55SDavid Howells kfree(cookie); 911e49c7b2fSDavid Howells _leave(""); 912e49c7b2fSDavid Howells return inode ?: ERR_PTR(ret); 9135cf9dd55SDavid Howells } 9145cf9dd55SDavid Howells 9155cf9dd55SDavid Howells /* 9166f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 9176f8880d8SDavid Howells */ 9186f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 9196f8880d8SDavid Howells struct key *key) 9206f8880d8SDavid Howells { 9216f8880d8SDavid Howells struct afs_sysnames *subs; 9226f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 9236f8880d8SDavid Howells struct dentry *ret; 9246f8880d8SDavid Howells char *buf, *p, *name; 9256f8880d8SDavid Howells int len, i; 9266f8880d8SDavid Howells 9276f8880d8SDavid Howells _enter(""); 9286f8880d8SDavid Howells 9296f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 9306f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 9316f8880d8SDavid Howells if (!buf) 9326f8880d8SDavid Howells goto out_p; 9336f8880d8SDavid Howells if (dentry->d_name.len > 4) { 9346f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 9356f8880d8SDavid Howells p += dentry->d_name.len - 4; 9366f8880d8SDavid Howells } 9376f8880d8SDavid Howells 9386f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 9396f8880d8SDavid Howells read_lock(&net->sysnames_lock); 9406f8880d8SDavid Howells subs = net->sysnames; 9416f8880d8SDavid Howells refcount_inc(&subs->usage); 9426f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 9436f8880d8SDavid Howells 9446f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 9456f8880d8SDavid Howells name = subs->subs[i]; 9466f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 9476f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 9486f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 9496f8880d8SDavid Howells goto out_s; 9506f8880d8SDavid Howells } 9516f8880d8SDavid Howells 9526f8880d8SDavid Howells strcpy(p, name); 9536f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 9546f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 9556f8880d8SDavid Howells goto out_s; 9566f8880d8SDavid Howells dput(ret); 9576f8880d8SDavid Howells } 9586f8880d8SDavid Howells 9596f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 9606f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 9616f8880d8SDavid Howells */ 9626f8880d8SDavid Howells ret = NULL; 9636f8880d8SDavid Howells out_s: 9646f8880d8SDavid Howells afs_put_sysnames(subs); 9656f8880d8SDavid Howells kfree(buf); 9666f8880d8SDavid Howells out_p: 9676f8880d8SDavid Howells key_put(key); 9686f8880d8SDavid Howells return ret; 9696f8880d8SDavid Howells } 9706f8880d8SDavid Howells 9716f8880d8SDavid Howells /* 97208e0e7c8SDavid Howells * look up an entry in a directory 97308e0e7c8SDavid Howells */ 974260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 97500cd8dd3SAl Viro unsigned int flags) 97608e0e7c8SDavid Howells { 9775cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 97840a708bdSDavid Howells struct afs_fid fid = {}; 97908e0e7c8SDavid Howells struct inode *inode; 98034b2a88fSAl Viro struct dentry *d; 98100d3b7a4SDavid Howells struct key *key; 98208e0e7c8SDavid Howells int ret; 98308e0e7c8SDavid Howells 9843b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 9855cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 986260a9803SDavid Howells 9872b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 98808e0e7c8SDavid Howells 98945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 99008e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 99108e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 99208e0e7c8SDavid Howells } 99308e0e7c8SDavid Howells 9945cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 99508e0e7c8SDavid Howells _leave(" = -ESTALE"); 99608e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 99708e0e7c8SDavid Howells } 99808e0e7c8SDavid Howells 9995cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 100000d3b7a4SDavid Howells if (IS_ERR(key)) { 100100d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 1002e231c2eeSDavid Howells return ERR_CAST(key); 100300d3b7a4SDavid Howells } 100400d3b7a4SDavid Howells 10055cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 100608e0e7c8SDavid Howells if (ret < 0) { 100700d3b7a4SDavid Howells key_put(key); 1008260a9803SDavid Howells _leave(" = %d [val]", ret); 10091da177e4SLinus Torvalds return ERR_PTR(ret); 10101da177e4SLinus Torvalds } 10111da177e4SLinus Torvalds 10126f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 10136f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 10146f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 10156f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 10166f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 10176f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 10186f8880d8SDavid Howells 1019d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 10205cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 102134b2a88fSAl Viro key_put(key); 1022f52b83b0SDavid Howells if (inode == ERR_PTR(-ENOENT)) 10235cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 102440a708bdSDavid Howells 102540a708bdSDavid Howells if (!IS_ERR_OR_NULL(inode)) 102640a708bdSDavid Howells fid = AFS_FS_I(inode)->fid; 102740a708bdSDavid Howells 1028fed79fd7SDavid Howells _debug("splice %p", dentry->d_inode); 102934b2a88fSAl Viro d = d_splice_alias(inode, dentry); 103080548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 103134b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 103240a708bdSDavid Howells trace_afs_lookup(dvnode, &d->d_name, &fid); 103380548b03SDavid Howells } else { 103440a708bdSDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, &fid); 103580548b03SDavid Howells } 1036e49c7b2fSDavid Howells _leave(""); 103734b2a88fSAl Viro return d; 1038ec26815aSDavid Howells } 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds /* 1041a0753c29SDavid Howells * Check the validity of a dentry under RCU conditions. 1042a0753c29SDavid Howells */ 1043a0753c29SDavid Howells static int afs_d_revalidate_rcu(struct dentry *dentry) 1044a0753c29SDavid Howells { 104563d49d84SDavid Howells struct afs_vnode *dvnode; 1046a0753c29SDavid Howells struct dentry *parent; 104763d49d84SDavid Howells struct inode *dir; 1048a0753c29SDavid Howells long dir_version, de_version; 1049a0753c29SDavid Howells 1050a0753c29SDavid Howells _enter("%p", dentry); 1051a0753c29SDavid Howells 1052a0753c29SDavid Howells /* Check the parent directory is still valid first. */ 1053a0753c29SDavid Howells parent = READ_ONCE(dentry->d_parent); 1054a0753c29SDavid Howells dir = d_inode_rcu(parent); 1055a0753c29SDavid Howells if (!dir) 1056a0753c29SDavid Howells return -ECHILD; 1057a0753c29SDavid Howells dvnode = AFS_FS_I(dir); 1058a0753c29SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 1059a0753c29SDavid Howells return -ECHILD; 1060a0753c29SDavid Howells 1061a0753c29SDavid Howells if (!afs_check_validity(dvnode)) 1062a0753c29SDavid Howells return -ECHILD; 1063a0753c29SDavid Howells 1064a0753c29SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1065a0753c29SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1066a0753c29SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1067a0753c29SDavid Howells * version. 1068a0753c29SDavid Howells */ 1069a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->status.data_version); 1070a0753c29SDavid Howells de_version = (long)READ_ONCE(dentry->d_fsdata); 1071a0753c29SDavid Howells if (de_version != dir_version) { 1072a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->invalid_before); 1073a0753c29SDavid Howells if (de_version - dir_version < 0) 1074a0753c29SDavid Howells return -ECHILD; 1075a0753c29SDavid Howells } 1076a0753c29SDavid Howells 1077a0753c29SDavid Howells return 1; /* Still valid */ 1078a0753c29SDavid Howells } 1079a0753c29SDavid Howells 1080a0753c29SDavid Howells /* 10811da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 10821da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 10831da177e4SLinus Torvalds * inode 10841da177e4SLinus Torvalds */ 10850b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 10861da177e4SLinus Torvalds { 1087260a9803SDavid Howells struct afs_vnode *vnode, *dir; 10883f649ab7SKees Cook struct afs_fid fid; 10891da177e4SLinus Torvalds struct dentry *parent; 1090c435ee34SDavid Howells struct inode *inode; 109100d3b7a4SDavid Howells struct key *key; 109240fc8102SDavid Howells afs_dataversion_t dir_version, invalid_before; 10939dd0b82eSDavid Howells long de_version; 10941da177e4SLinus Torvalds int ret; 10951da177e4SLinus Torvalds 10960b728e19SAl Viro if (flags & LOOKUP_RCU) 1097a0753c29SDavid Howells return afs_d_revalidate_rcu(dentry); 109834286d66SNick Piggin 1099c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 11002b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 11013b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1102a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 1103260a9803SDavid Howells vnode->flags); 1104c435ee34SDavid Howells } else { 1105a455589fSAl Viro _enter("{neg n=%pd}", dentry); 1106c435ee34SDavid Howells } 11071da177e4SLinus Torvalds 1108260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 110900d3b7a4SDavid Howells if (IS_ERR(key)) 111000d3b7a4SDavid Howells key = NULL; 111100d3b7a4SDavid Howells 111263d49d84SDavid Howells /* Hold the parent dentry so we can peer at it */ 111308e0e7c8SDavid Howells parent = dget_parent(dentry); 11142b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 11151da177e4SLinus Torvalds 1116260a9803SDavid Howells /* validate the parent directory */ 1117260a9803SDavid Howells afs_validate(dir, key); 1118260a9803SDavid Howells 1119260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1120a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 112163d49d84SDavid Howells goto not_found; 11221da177e4SLinus Torvalds } 11231da177e4SLinus Torvalds 1124a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1125a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1126a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1127a4ff7401SDavid Howells * version. 1128a4ff7401SDavid Howells */ 11299dd0b82eSDavid Howells dir_version = dir->status.data_version; 1130a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 11319dd0b82eSDavid Howells if (de_version == (long)dir_version) 11325dc84855SDavid Howells goto out_valid_noupdate; 1133a4ff7401SDavid Howells 113440fc8102SDavid Howells invalid_before = dir->invalid_before; 113540fc8102SDavid Howells if (de_version - (long)invalid_before >= 0) 1136a4ff7401SDavid Howells goto out_valid; 1137260a9803SDavid Howells 113808e0e7c8SDavid Howells _debug("dir modified"); 1139d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds /* search the directory for this vnode */ 11429dd0b82eSDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); 1143260a9803SDavid Howells switch (ret) { 1144260a9803SDavid Howells case 0: 1145260a9803SDavid Howells /* the filename maps to something */ 11462b0143b5SDavid Howells if (d_really_is_negative(dentry)) 114763d49d84SDavid Howells goto not_found; 1148c435ee34SDavid Howells inode = d_inode(dentry); 1149c435ee34SDavid Howells if (is_bad_inode(inode)) { 1150a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1151a455589fSAl Viro dentry); 115263d49d84SDavid Howells goto not_found; 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds 1155c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1156c435ee34SDavid Howells 11571da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 11581da177e4SLinus Torvalds * different file */ 115908e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 11603b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1161a455589fSAl Viro dentry, fid.vnode, 116208e0e7c8SDavid Howells vnode->fid.vnode); 11631da177e4SLinus Torvalds goto not_found; 11641da177e4SLinus Torvalds } 11651da177e4SLinus Torvalds 11661da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1167260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1168260a9803SDavid Howells * been reused */ 116908e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1170a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1171a455589fSAl Viro dentry, fid.unique, 11727a224228SJean Noel Cordenner vnode->fid.unique, 1173c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1174260a9803SDavid Howells goto not_found; 1175260a9803SDavid Howells } 1176260a9803SDavid Howells goto out_valid; 1177260a9803SDavid Howells 1178260a9803SDavid Howells case -ENOENT: 1179260a9803SDavid Howells /* the filename is unknown */ 1180a455589fSAl Viro _debug("%pd: dirent not found", dentry); 11812b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1182260a9803SDavid Howells goto not_found; 1183260a9803SDavid Howells goto out_valid; 1184260a9803SDavid Howells 1185260a9803SDavid Howells default: 1186a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1187a455589fSAl Viro parent, ret); 118863d49d84SDavid Howells goto not_found; 11891da177e4SLinus Torvalds } 119008e0e7c8SDavid Howells 11911da177e4SLinus Torvalds out_valid: 11929dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)dir_version; 11935dc84855SDavid Howells out_valid_noupdate: 11941da177e4SLinus Torvalds dput(parent); 119500d3b7a4SDavid Howells key_put(key); 11961da177e4SLinus Torvalds _leave(" = 1 [valid]"); 11971da177e4SLinus Torvalds return 1; 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds not_found: 1200a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 12011da177e4SLinus Torvalds dput(parent); 120200d3b7a4SDavid Howells key_put(key); 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds _leave(" = 0 [bad]"); 12051da177e4SLinus Torvalds return 0; 1206ec26815aSDavid Howells } 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds /* 12091da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 12101da177e4SLinus Torvalds * sleep) 12111da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 12121da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 12131da177e4SLinus Torvalds */ 1214fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 12151da177e4SLinus Torvalds { 1216a455589fSAl Viro _enter("%pd", dentry); 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 12191da177e4SLinus Torvalds goto zap; 12201da177e4SLinus Torvalds 12212b0143b5SDavid Howells if (d_really_is_positive(dentry) && 12222b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 12232b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 12241da177e4SLinus Torvalds goto zap; 12251da177e4SLinus Torvalds 12261da177e4SLinus Torvalds _leave(" = 0 [keep]"); 12271da177e4SLinus Torvalds return 0; 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds zap: 12301da177e4SLinus Torvalds _leave(" = 1 [zap]"); 12311da177e4SLinus Torvalds return 1; 1232ec26815aSDavid Howells } 1233260a9803SDavid Howells 1234260a9803SDavid Howells /* 123579ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 123679ddbfa5SDavid Howells */ 123779ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 123879ddbfa5SDavid Howells { 123979ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 124079ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 124179ddbfa5SDavid Howells iput(inode); 124279ddbfa5SDavid Howells } 124379ddbfa5SDavid Howells 124479ddbfa5SDavid Howells /* 1245260a9803SDavid Howells * handle dentry release 1246260a9803SDavid Howells */ 124766c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1248260a9803SDavid Howells { 1249a455589fSAl Viro _enter("%pd", dentry); 1250260a9803SDavid Howells } 1251260a9803SDavid Howells 1252728279a5SDavid Howells void afs_check_for_remote_deletion(struct afs_operation *op) 1253728279a5SDavid Howells { 1254728279a5SDavid Howells struct afs_vnode *vnode = op->file[0].vnode; 1255728279a5SDavid Howells 1256728279a5SDavid Howells switch (op->ac.abort_code) { 1257728279a5SDavid Howells case VNOVNODE: 1258728279a5SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1259728279a5SDavid Howells afs_break_callback(vnode, afs_cb_break_for_deleted); 1260728279a5SDavid Howells } 1261728279a5SDavid Howells } 1262728279a5SDavid Howells 1263260a9803SDavid Howells /* 1264d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1265d2ddc776SDavid Howells */ 1266e49c7b2fSDavid Howells static void afs_vnode_new_inode(struct afs_operation *op) 1267d2ddc776SDavid Howells { 1268e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 12695a813276SDavid Howells struct afs_vnode *vnode; 1270d2ddc776SDavid Howells struct inode *inode; 1271d2ddc776SDavid Howells 1272e49c7b2fSDavid Howells _enter(""); 1273d2ddc776SDavid Howells 1274e49c7b2fSDavid Howells ASSERTCMP(op->error, ==, 0); 1275e49c7b2fSDavid Howells 1276e49c7b2fSDavid Howells inode = afs_iget(op, vp); 1277d2ddc776SDavid Howells if (IS_ERR(inode)) { 1278d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1279d2ddc776SDavid Howells * the new directory on the server. 1280d2ddc776SDavid Howells */ 1281e49c7b2fSDavid Howells op->error = PTR_ERR(inode); 1282d2ddc776SDavid Howells return; 1283d2ddc776SDavid Howells } 1284d2ddc776SDavid Howells 12855a813276SDavid Howells vnode = AFS_FS_I(inode); 12865a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1287e49c7b2fSDavid Howells if (!op->error) 1288e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); 1289e49c7b2fSDavid Howells d_instantiate(op->dentry, inode); 1290d2ddc776SDavid Howells } 1291d2ddc776SDavid Howells 1292e49c7b2fSDavid Howells static void afs_create_success(struct afs_operation *op) 1293b8359153SDavid Howells { 1294e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1295da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1296e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1297e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1298e49c7b2fSDavid Howells afs_vnode_new_inode(op); 1299b8359153SDavid Howells } 1300b8359153SDavid Howells 1301e49c7b2fSDavid Howells static void afs_create_edit_dir(struct afs_operation *op) 13029dd0b82eSDavid Howells { 1303e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1304e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1305e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1306e49c7b2fSDavid Howells 1307e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1308e49c7b2fSDavid Howells 1309e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1310e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1311e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1312e49c7b2fSDavid Howells afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, 1313e49c7b2fSDavid Howells op->create.reason); 1314e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 13159dd0b82eSDavid Howells } 13169dd0b82eSDavid Howells 1317e49c7b2fSDavid Howells static void afs_create_put(struct afs_operation *op) 1318e49c7b2fSDavid Howells { 1319e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1320e49c7b2fSDavid Howells 1321e49c7b2fSDavid Howells if (op->error) 1322e49c7b2fSDavid Howells d_drop(op->dentry); 1323e49c7b2fSDavid Howells } 1324e49c7b2fSDavid Howells 1325e49c7b2fSDavid Howells static const struct afs_operation_ops afs_mkdir_operation = { 1326e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_make_dir, 1327e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_make_dir, 1328e49c7b2fSDavid Howells .success = afs_create_success, 1329728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1330e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1331e49c7b2fSDavid Howells .put = afs_create_put, 1332e49c7b2fSDavid Howells }; 1333e49c7b2fSDavid Howells 13349dd0b82eSDavid Howells /* 1335260a9803SDavid Howells * create a directory on an AFS filesystem 1336260a9803SDavid Howells */ 1337549c7297SChristian Brauner static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1338549c7297SChristian Brauner struct dentry *dentry, umode_t mode) 1339260a9803SDavid Howells { 1340e49c7b2fSDavid Howells struct afs_operation *op; 1341d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1342260a9803SDavid Howells 13433b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1344a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1345260a9803SDavid Howells 1346e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1347e49c7b2fSDavid Howells if (IS_ERR(op)) { 1348260a9803SDavid Howells d_drop(dentry); 1349e49c7b2fSDavid Howells return PTR_ERR(op); 1350e49c7b2fSDavid Howells } 1351e49c7b2fSDavid Howells 1352e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1353e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 135422650f14SDavid Howells op->file[0].modification = true; 1355da8d0755SDavid Howells op->file[0].update_ctime = true; 1356e49c7b2fSDavid Howells op->dentry = dentry; 1357e49c7b2fSDavid Howells op->create.mode = S_IFDIR | mode; 1358e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_mkdir; 1359e49c7b2fSDavid Howells op->ops = &afs_mkdir_operation; 1360e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1361260a9803SDavid Howells } 1362260a9803SDavid Howells 1363260a9803SDavid Howells /* 1364d2ddc776SDavid Howells * Remove a subdir from a directory. 1365260a9803SDavid Howells */ 1366d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1367260a9803SDavid Howells { 13682b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1369d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1370d2ddc776SDavid Howells 1371260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1372260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1373c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 137463a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1375260a9803SDavid Howells } 1376260a9803SDavid Howells } 1377260a9803SDavid Howells 1378e49c7b2fSDavid Howells static void afs_rmdir_success(struct afs_operation *op) 1379e49c7b2fSDavid Howells { 1380e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1381da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1382e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1383e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1384e49c7b2fSDavid Howells } 1385e49c7b2fSDavid Howells 1386e49c7b2fSDavid Howells static void afs_rmdir_edit_dir(struct afs_operation *op) 1387e49c7b2fSDavid Howells { 1388e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1389e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1390e49c7b2fSDavid Howells 1391e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1392e49c7b2fSDavid Howells afs_dir_remove_subdir(op->dentry); 1393e49c7b2fSDavid Howells 1394e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1395e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1396e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1397e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1398e49c7b2fSDavid Howells afs_edit_dir_for_rmdir); 1399e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1400e49c7b2fSDavid Howells } 1401e49c7b2fSDavid Howells 1402e49c7b2fSDavid Howells static void afs_rmdir_put(struct afs_operation *op) 1403e49c7b2fSDavid Howells { 1404e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1405e49c7b2fSDavid Howells if (op->file[1].vnode) 1406e49c7b2fSDavid Howells up_write(&op->file[1].vnode->rmdir_lock); 1407e49c7b2fSDavid Howells } 1408e49c7b2fSDavid Howells 1409e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rmdir_operation = { 1410e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_dir, 1411e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_dir, 1412e49c7b2fSDavid Howells .success = afs_rmdir_success, 1413728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1414e49c7b2fSDavid Howells .edit_dir = afs_rmdir_edit_dir, 1415e49c7b2fSDavid Howells .put = afs_rmdir_put, 1416e49c7b2fSDavid Howells }; 1417e49c7b2fSDavid Howells 1418260a9803SDavid Howells /* 1419d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1420260a9803SDavid Howells */ 1421d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1422260a9803SDavid Howells { 1423e49c7b2fSDavid Howells struct afs_operation *op; 1424f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1425260a9803SDavid Howells int ret; 1426260a9803SDavid Howells 14273b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1428a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1429260a9803SDavid Howells 1430e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1431e49c7b2fSDavid Howells if (IS_ERR(op)) 1432e49c7b2fSDavid Howells return PTR_ERR(op); 1433a58823acSDavid Howells 1434e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1435e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 143622650f14SDavid Howells op->file[0].modification = true; 1437da8d0755SDavid Howells op->file[0].update_ctime = true; 1438e49c7b2fSDavid Howells 1439e49c7b2fSDavid Howells op->dentry = dentry; 1440e49c7b2fSDavid Howells op->ops = &afs_rmdir_operation; 1441260a9803SDavid Howells 1442f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1443f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1444f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1445e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1446f58db83fSDavid Howells if (ret < 0) 1447e49c7b2fSDavid Howells goto error; 1448f58db83fSDavid Howells } 1449f58db83fSDavid Howells 145079ddbfa5SDavid Howells if (vnode) { 145179ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 145279ddbfa5SDavid Howells if (ret < 0) 1453e49c7b2fSDavid Howells goto error; 1454e49c7b2fSDavid Howells op->file[1].vnode = vnode; 145579ddbfa5SDavid Howells } 145679ddbfa5SDavid Howells 1457e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1458a58823acSDavid Howells 1459d2ddc776SDavid Howells error: 1460e49c7b2fSDavid Howells return afs_put_operation(op); 1461d2ddc776SDavid Howells } 1462260a9803SDavid Howells 1463d2ddc776SDavid Howells /* 1464d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1465d2ddc776SDavid Howells * 1466d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1467d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1468d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1469d2ddc776SDavid Howells * 1470d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1471d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1472d2ddc776SDavid Howells */ 1473e49c7b2fSDavid Howells static void afs_dir_remove_link(struct afs_operation *op) 1474d2ddc776SDavid Howells { 1475e49c7b2fSDavid Howells struct afs_vnode *dvnode = op->file[0].vnode; 1476e49c7b2fSDavid Howells struct afs_vnode *vnode = op->file[1].vnode; 1477e49c7b2fSDavid Howells struct dentry *dentry = op->dentry; 1478e49c7b2fSDavid Howells int ret; 1479d2ddc776SDavid Howells 1480e49c7b2fSDavid Howells if (op->error != 0 || 1481e49c7b2fSDavid Howells (op->file[1].scb.have_status && op->file[1].scb.have_error)) 1482e49c7b2fSDavid Howells return; 1483e49c7b2fSDavid Howells if (d_really_is_positive(dentry)) 1484e49c7b2fSDavid Howells return; 1485d2ddc776SDavid Howells 148630062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 148730062bd1SDavid Howells /* Already done */ 1488a38a7558SDavid Howells } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1489a38a7558SDavid Howells write_seqlock(&vnode->cb_lock); 1490440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1491440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1492440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1493051d2525SDavid Howells __afs_break_callback(vnode, afs_cb_break_for_unlink); 1494440fbc3aSDavid Howells } 1495a38a7558SDavid Howells write_sequnlock(&vnode->cb_lock); 1496440fbc3aSDavid Howells } else { 1497051d2525SDavid Howells afs_break_callback(vnode, afs_cb_break_for_unlink); 1498440fbc3aSDavid Howells 1499d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1500e49c7b2fSDavid Howells _debug("AFS_VNODE_DELETED"); 1501d2ddc776SDavid Howells 1502e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1503e49c7b2fSDavid Howells if (ret != -ESTALE) 1504e49c7b2fSDavid Howells op->error = ret; 1505d2ddc776SDavid Howells } 1506d2ddc776SDavid Howells 1507e49c7b2fSDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error); 1508d2ddc776SDavid Howells } 1509d2ddc776SDavid Howells 1510e49c7b2fSDavid Howells static void afs_unlink_success(struct afs_operation *op) 1511e49c7b2fSDavid Howells { 1512e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1513da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1514b6489a49SDavid Howells afs_check_dir_conflict(op, &op->file[0]); 1515e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1516e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1517e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1518e49c7b2fSDavid Howells afs_dir_remove_link(op); 1519e49c7b2fSDavid Howells } 1520e49c7b2fSDavid Howells 1521e49c7b2fSDavid Howells static void afs_unlink_edit_dir(struct afs_operation *op) 1522e49c7b2fSDavid Howells { 1523e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1524e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1525e49c7b2fSDavid Howells 1526e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1527e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1528e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1529e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1530e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1531e49c7b2fSDavid Howells afs_edit_dir_for_unlink); 1532e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1533e49c7b2fSDavid Howells } 1534e49c7b2fSDavid Howells 1535e49c7b2fSDavid Howells static void afs_unlink_put(struct afs_operation *op) 1536e49c7b2fSDavid Howells { 1537e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1538e49c7b2fSDavid Howells if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) 1539e49c7b2fSDavid Howells d_rehash(op->dentry); 1540e49c7b2fSDavid Howells } 1541e49c7b2fSDavid Howells 1542e49c7b2fSDavid Howells static const struct afs_operation_ops afs_unlink_operation = { 1543e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_file, 1544e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_file, 1545e49c7b2fSDavid Howells .success = afs_unlink_success, 1546728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1547e49c7b2fSDavid Howells .edit_dir = afs_unlink_edit_dir, 1548e49c7b2fSDavid Howells .put = afs_unlink_put, 1549e49c7b2fSDavid Howells }; 1550e49c7b2fSDavid Howells 1551d2ddc776SDavid Howells /* 1552d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1553d2ddc776SDavid Howells */ 1554d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1555d2ddc776SDavid Howells { 1556e49c7b2fSDavid Howells struct afs_operation *op; 1557fa59f52fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1558fa59f52fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1559d2ddc776SDavid Howells int ret; 1560d2ddc776SDavid Howells 15613b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1562d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1563d2ddc776SDavid Howells 1564d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1565d2ddc776SDavid Howells return -ENAMETOOLONG; 1566d2ddc776SDavid Howells 1567e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1568e49c7b2fSDavid Howells if (IS_ERR(op)) 1569e49c7b2fSDavid Howells return PTR_ERR(op); 1570a58823acSDavid Howells 1571e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1572e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 157322650f14SDavid Howells op->file[0].modification = true; 1574da8d0755SDavid Howells op->file[0].update_ctime = true; 1575d2ddc776SDavid Howells 1576d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1577e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1578e49c7b2fSDavid Howells if (ret < 0) { 1579e49c7b2fSDavid Howells op->error = ret; 1580e49c7b2fSDavid Howells goto error; 1581e49c7b2fSDavid Howells } 1582d2ddc776SDavid Howells 158379ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 1584fa59f52fSDavid Howells if (d_count(dentry) > 1) { 158579ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 158679ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 158779ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 1588e49c7b2fSDavid Howells op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); 1589e49c7b2fSDavid Howells goto error; 159079ddbfa5SDavid Howells } 159179ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 159279ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 159379ddbfa5SDavid Howells __d_drop(dentry); 1594e49c7b2fSDavid Howells op->unlink.need_rehash = true; 159579ddbfa5SDavid Howells } 159679ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 159779ddbfa5SDavid Howells 1598e49c7b2fSDavid Howells op->file[1].vnode = vnode; 1599da8d0755SDavid Howells op->file[1].update_ctime = true; 1600b6489a49SDavid Howells op->file[1].op_unlinked = true; 1601e49c7b2fSDavid Howells op->dentry = dentry; 1602e49c7b2fSDavid Howells op->ops = &afs_unlink_operation; 1603b6489a49SDavid Howells afs_begin_vnode_operation(op); 1604b6489a49SDavid Howells afs_wait_for_operation(op); 1605b6489a49SDavid Howells 1606b6489a49SDavid Howells /* If there was a conflict with a third party, check the status of the 1607b6489a49SDavid Howells * unlinked vnode. 1608b6489a49SDavid Howells */ 1609b6489a49SDavid Howells if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) { 1610b6489a49SDavid Howells op->file[1].update_ctime = false; 1611b6489a49SDavid Howells op->fetch_status.which = 1; 1612b6489a49SDavid Howells op->ops = &afs_fetch_status_operation; 1613b6489a49SDavid Howells afs_begin_vnode_operation(op); 1614b6489a49SDavid Howells afs_wait_for_operation(op); 1615b6489a49SDavid Howells } 1616b6489a49SDavid Howells 1617b6489a49SDavid Howells return afs_put_operation(op); 1618a58823acSDavid Howells 1619260a9803SDavid Howells error: 1620e49c7b2fSDavid Howells return afs_put_operation(op); 1621260a9803SDavid Howells } 1622260a9803SDavid Howells 1623e49c7b2fSDavid Howells static const struct afs_operation_ops afs_create_operation = { 1624e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_create_file, 1625e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_create_file, 1626e49c7b2fSDavid Howells .success = afs_create_success, 1627728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1628e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1629e49c7b2fSDavid Howells .put = afs_create_put, 1630e49c7b2fSDavid Howells }; 1631e49c7b2fSDavid Howells 1632260a9803SDavid Howells /* 1633260a9803SDavid Howells * create a regular file on an AFS filesystem 1634260a9803SDavid Howells */ 1635549c7297SChristian Brauner static int afs_create(struct user_namespace *mnt_userns, struct inode *dir, 1636549c7297SChristian Brauner struct dentry *dentry, umode_t mode, bool excl) 1637260a9803SDavid Howells { 1638e49c7b2fSDavid Howells struct afs_operation *op; 163943dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1640e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1641260a9803SDavid Howells 1642e49c7b2fSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1643a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1644260a9803SDavid Howells 1645d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1646d2ddc776SDavid Howells goto error; 1647d2ddc776SDavid Howells 1648e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1649e49c7b2fSDavid Howells if (IS_ERR(op)) { 1650e49c7b2fSDavid Howells ret = PTR_ERR(op); 1651260a9803SDavid Howells goto error; 1652260a9803SDavid Howells } 1653260a9803SDavid Howells 1654e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1655e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 165622650f14SDavid Howells op->file[0].modification = true; 1657da8d0755SDavid Howells op->file[0].update_ctime = true; 1658a58823acSDavid Howells 1659e49c7b2fSDavid Howells op->dentry = dentry; 1660e49c7b2fSDavid Howells op->create.mode = S_IFREG | mode; 1661e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_create; 1662e49c7b2fSDavid Howells op->ops = &afs_create_operation; 1663e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1664a58823acSDavid Howells 1665260a9803SDavid Howells error: 1666260a9803SDavid Howells d_drop(dentry); 1667260a9803SDavid Howells _leave(" = %d", ret); 1668260a9803SDavid Howells return ret; 1669260a9803SDavid Howells } 1670260a9803SDavid Howells 1671e49c7b2fSDavid Howells static void afs_link_success(struct afs_operation *op) 1672e49c7b2fSDavid Howells { 1673e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1674e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1675e49c7b2fSDavid Howells 1676e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1677da8d0755SDavid Howells op->ctime = dvp->scb.status.mtime_client; 1678e49c7b2fSDavid Howells afs_vnode_commit_status(op, dvp); 1679e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 1680e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry); 1681e49c7b2fSDavid Howells if (op->dentry_2->d_parent == op->dentry->d_parent) 1682e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry_2); 1683e49c7b2fSDavid Howells ihold(&vp->vnode->vfs_inode); 1684e49c7b2fSDavid Howells d_instantiate(op->dentry, &vp->vnode->vfs_inode); 1685e49c7b2fSDavid Howells } 1686e49c7b2fSDavid Howells 1687e49c7b2fSDavid Howells static void afs_link_put(struct afs_operation *op) 1688e49c7b2fSDavid Howells { 1689e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1690e49c7b2fSDavid Howells if (op->error) 1691e49c7b2fSDavid Howells d_drop(op->dentry); 1692e49c7b2fSDavid Howells } 1693e49c7b2fSDavid Howells 1694e49c7b2fSDavid Howells static const struct afs_operation_ops afs_link_operation = { 1695e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_link, 1696e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_link, 1697e49c7b2fSDavid Howells .success = afs_link_success, 1698728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1699e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1700e49c7b2fSDavid Howells .put = afs_link_put, 1701e49c7b2fSDavid Howells }; 1702e49c7b2fSDavid Howells 1703260a9803SDavid Howells /* 1704260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1705260a9803SDavid Howells */ 1706260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1707260a9803SDavid Howells struct dentry *dentry) 1708260a9803SDavid Howells { 1709e49c7b2fSDavid Howells struct afs_operation *op; 1710a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1711a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1712e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1713260a9803SDavid Howells 17143b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1715260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1716260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1717a455589fSAl Viro dentry); 1718260a9803SDavid Howells 1719d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1720d2ddc776SDavid Howells goto error; 1721d2ddc776SDavid Howells 1722e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1723e49c7b2fSDavid Howells if (IS_ERR(op)) { 1724e49c7b2fSDavid Howells ret = PTR_ERR(op); 1725a58823acSDavid Howells goto error; 1726260a9803SDavid Howells } 1727260a9803SDavid Howells 17283978d816SDavid Howells ret = afs_validate(vnode, op->key); 17293978d816SDavid Howells if (ret < 0) 17303978d816SDavid Howells goto error_op; 17313978d816SDavid Howells 1732e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1733e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, vnode); 1734e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 173522650f14SDavid Howells op->file[0].modification = true; 1736da8d0755SDavid Howells op->file[0].update_ctime = true; 1737da8d0755SDavid Howells op->file[1].update_ctime = true; 1738a58823acSDavid Howells 1739e49c7b2fSDavid Howells op->dentry = dentry; 1740e49c7b2fSDavid Howells op->dentry_2 = from; 1741e49c7b2fSDavid Howells op->ops = &afs_link_operation; 1742e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_link; 1743e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1744260a9803SDavid Howells 17453978d816SDavid Howells error_op: 17463978d816SDavid Howells afs_put_operation(op); 1747260a9803SDavid Howells error: 1748260a9803SDavid Howells d_drop(dentry); 1749260a9803SDavid Howells _leave(" = %d", ret); 1750260a9803SDavid Howells return ret; 1751260a9803SDavid Howells } 1752260a9803SDavid Howells 1753e49c7b2fSDavid Howells static const struct afs_operation_ops afs_symlink_operation = { 1754e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_symlink, 1755e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_symlink, 1756e49c7b2fSDavid Howells .success = afs_create_success, 1757728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1758e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1759e49c7b2fSDavid Howells .put = afs_create_put, 1760e49c7b2fSDavid Howells }; 1761e49c7b2fSDavid Howells 1762260a9803SDavid Howells /* 1763260a9803SDavid Howells * create a symlink in an AFS filesystem 1764260a9803SDavid Howells */ 1765549c7297SChristian Brauner static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1766549c7297SChristian Brauner struct dentry *dentry, const char *content) 1767260a9803SDavid Howells { 1768e49c7b2fSDavid Howells struct afs_operation *op; 1769d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1770260a9803SDavid Howells int ret; 1771260a9803SDavid Howells 17723b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1773a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1774260a9803SDavid Howells content); 1775260a9803SDavid Howells 1776d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1777d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1778d2ddc776SDavid Howells goto error; 1779d2ddc776SDavid Howells 1780260a9803SDavid Howells ret = -EINVAL; 178145222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1782260a9803SDavid Howells goto error; 1783260a9803SDavid Howells 1784e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1785e49c7b2fSDavid Howells if (IS_ERR(op)) { 1786e49c7b2fSDavid Howells ret = PTR_ERR(op); 1787a58823acSDavid Howells goto error; 1788260a9803SDavid Howells } 1789260a9803SDavid Howells 1790e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1791e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1792a58823acSDavid Howells 1793e49c7b2fSDavid Howells op->dentry = dentry; 1794e49c7b2fSDavid Howells op->ops = &afs_symlink_operation; 1795e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_symlink; 1796e49c7b2fSDavid Howells op->create.symlink = content; 1797e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1798d2ddc776SDavid Howells 1799260a9803SDavid Howells error: 1800260a9803SDavid Howells d_drop(dentry); 1801260a9803SDavid Howells _leave(" = %d", ret); 1802260a9803SDavid Howells return ret; 1803260a9803SDavid Howells } 1804260a9803SDavid Howells 1805e49c7b2fSDavid Howells static void afs_rename_success(struct afs_operation *op) 1806260a9803SDavid Howells { 1807e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1808e49c7b2fSDavid Howells 1809da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1810b6489a49SDavid Howells afs_check_dir_conflict(op, &op->file[1]); 1811e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1812da8d0755SDavid Howells if (op->file[1].vnode != op->file[0].vnode) { 1813da8d0755SDavid Howells op->ctime = op->file[1].scb.status.mtime_client; 1814e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1815e49c7b2fSDavid Howells } 1816da8d0755SDavid Howells } 1817e49c7b2fSDavid Howells 1818e49c7b2fSDavid Howells static void afs_rename_edit_dir(struct afs_operation *op) 1819e49c7b2fSDavid Howells { 1820e49c7b2fSDavid Howells struct afs_vnode_param *orig_dvp = &op->file[0]; 1821e49c7b2fSDavid Howells struct afs_vnode_param *new_dvp = &op->file[1]; 1822e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode = orig_dvp->vnode; 1823e49c7b2fSDavid Howells struct afs_vnode *new_dvnode = new_dvp->vnode; 1824e49c7b2fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); 1825e49c7b2fSDavid Howells struct dentry *old_dentry = op->dentry; 1826e49c7b2fSDavid Howells struct dentry *new_dentry = op->dentry_2; 182779ddbfa5SDavid Howells struct inode *new_inode; 1828260a9803SDavid Howells 1829e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 18301cd66c93SMiklos Szeredi 1831e49c7b2fSDavid Howells if (op->rename.rehash) { 1832e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1833e49c7b2fSDavid Howells op->rename.rehash = NULL; 1834260a9803SDavid Howells } 1835260a9803SDavid Howells 18362105c282SDavid Howells down_write(&orig_dvnode->validate_lock); 18372105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && 1838e49c7b2fSDavid Howells orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) 183963a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 184079ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 184163a4681fSDavid Howells 1842e49c7b2fSDavid Howells if (new_dvnode != orig_dvnode) { 1843e49c7b2fSDavid Howells up_write(&orig_dvnode->validate_lock); 18442105c282SDavid Howells down_write(&new_dvnode->validate_lock); 18452105c282SDavid Howells } 1846e49c7b2fSDavid Howells 18472105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && 1848e49c7b2fSDavid Howells new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { 1849e49c7b2fSDavid Howells if (!op->rename.new_negative) 185063a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 185179ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 185263a4681fSDavid Howells 185363a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 185479ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 18552105c282SDavid Howells } 185679ddbfa5SDavid Howells 185779ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 185879ddbfa5SDavid Howells if (new_inode) { 185979ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 1860f610a5a2SDavid Howells if (S_ISDIR(new_inode->i_mode)) 1861f610a5a2SDavid Howells clear_nlink(new_inode); 1862f610a5a2SDavid Howells else if (new_inode->i_nlink > 0) 186379ddbfa5SDavid Howells drop_nlink(new_inode); 186479ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 186579ddbfa5SDavid Howells } 18669dd0b82eSDavid Howells 18679dd0b82eSDavid Howells /* Now we can update d_fsdata on the dentries to reflect their 18689dd0b82eSDavid Howells * new parent's data_version. 18699dd0b82eSDavid Howells * 18709dd0b82eSDavid Howells * Note that if we ever implement RENAME_EXCHANGE, we'll have 18719dd0b82eSDavid Howells * to update both dentries with opposing dir versions. 18729dd0b82eSDavid Howells */ 1873e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry); 1874e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry_2); 1875e49c7b2fSDavid Howells 187679ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 1877e49c7b2fSDavid Howells 18782105c282SDavid Howells up_write(&new_dvnode->validate_lock); 187963a4681fSDavid Howells } 188063a4681fSDavid Howells 1881e49c7b2fSDavid Howells static void afs_rename_put(struct afs_operation *op) 1882e49c7b2fSDavid Howells { 1883e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1884e49c7b2fSDavid Howells if (op->rename.rehash) 1885e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1886e49c7b2fSDavid Howells dput(op->rename.tmp); 1887e49c7b2fSDavid Howells if (op->error) 1888e49c7b2fSDavid Howells d_rehash(op->dentry); 1889e49c7b2fSDavid Howells } 1890e49c7b2fSDavid Howells 1891e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rename_operation = { 1892e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_rename, 1893e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_rename, 1894e49c7b2fSDavid Howells .success = afs_rename_success, 1895e49c7b2fSDavid Howells .edit_dir = afs_rename_edit_dir, 1896e49c7b2fSDavid Howells .put = afs_rename_put, 1897e49c7b2fSDavid Howells }; 1898e49c7b2fSDavid Howells 1899e49c7b2fSDavid Howells /* 1900e49c7b2fSDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1901e49c7b2fSDavid Howells */ 1902549c7297SChristian Brauner static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1903549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir, 1904549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags) 1905e49c7b2fSDavid Howells { 1906e49c7b2fSDavid Howells struct afs_operation *op; 1907e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1908e49c7b2fSDavid Howells int ret; 1909e49c7b2fSDavid Howells 1910e49c7b2fSDavid Howells if (flags) 1911e49c7b2fSDavid Howells return -EINVAL; 1912e49c7b2fSDavid Howells 1913e49c7b2fSDavid Howells /* Don't allow silly-rename files be moved around. */ 1914e49c7b2fSDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 1915e49c7b2fSDavid Howells return -EINVAL; 1916e49c7b2fSDavid Howells 1917e49c7b2fSDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1918e49c7b2fSDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1919e49c7b2fSDavid Howells new_dvnode = AFS_FS_I(new_dir); 1920e49c7b2fSDavid Howells 1921e49c7b2fSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1922e49c7b2fSDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1923e49c7b2fSDavid Howells vnode->fid.vid, vnode->fid.vnode, 1924e49c7b2fSDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1925e49c7b2fSDavid Howells new_dentry); 1926e49c7b2fSDavid Howells 1927e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, orig_dvnode->volume); 1928e49c7b2fSDavid Howells if (IS_ERR(op)) 1929e49c7b2fSDavid Howells return PTR_ERR(op); 1930e49c7b2fSDavid Howells 19313978d816SDavid Howells ret = afs_validate(vnode, op->key); 19323978d816SDavid Howells op->error = ret; 19333978d816SDavid Howells if (ret < 0) 19343978d816SDavid Howells goto error; 19353978d816SDavid Howells 1936e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, orig_dvnode); 1937e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ 1938e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1939e49c7b2fSDavid Howells op->file[1].dv_delta = 1; 194022650f14SDavid Howells op->file[0].modification = true; 194122650f14SDavid Howells op->file[1].modification = true; 1942da8d0755SDavid Howells op->file[0].update_ctime = true; 1943da8d0755SDavid Howells op->file[1].update_ctime = true; 1944e49c7b2fSDavid Howells 1945e49c7b2fSDavid Howells op->dentry = old_dentry; 1946e49c7b2fSDavid Howells op->dentry_2 = new_dentry; 1947e49c7b2fSDavid Howells op->rename.new_negative = d_is_negative(new_dentry); 1948e49c7b2fSDavid Howells op->ops = &afs_rename_operation; 1949e49c7b2fSDavid Howells 1950e49c7b2fSDavid Howells /* For non-directories, check whether the target is busy and if so, 1951e49c7b2fSDavid Howells * make a copy of the dentry and then do a silly-rename. If the 1952e49c7b2fSDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 1953e49c7b2fSDavid Howells * new target. 1954e49c7b2fSDavid Howells */ 1955e49c7b2fSDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 1956e49c7b2fSDavid Howells /* To prevent any new references to the target during the 1957e49c7b2fSDavid Howells * rename, we unhash the dentry in advance. 1958e49c7b2fSDavid Howells */ 1959e49c7b2fSDavid Howells if (!d_unhashed(new_dentry)) { 1960e49c7b2fSDavid Howells d_drop(new_dentry); 1961e49c7b2fSDavid Howells op->rename.rehash = new_dentry; 1962e49c7b2fSDavid Howells } 1963e49c7b2fSDavid Howells 1964e49c7b2fSDavid Howells if (d_count(new_dentry) > 2) { 1965e49c7b2fSDavid Howells /* copy the target dentry's name */ 1966e49c7b2fSDavid Howells op->rename.tmp = d_alloc(new_dentry->d_parent, 1967e49c7b2fSDavid Howells &new_dentry->d_name); 1968b4280812SJiapeng Chong if (!op->rename.tmp) { 1969b4280812SJiapeng Chong op->error = -ENOMEM; 1970e49c7b2fSDavid Howells goto error; 1971b4280812SJiapeng Chong } 1972e49c7b2fSDavid Howells 1973e49c7b2fSDavid Howells ret = afs_sillyrename(new_dvnode, 1974e49c7b2fSDavid Howells AFS_FS_I(d_inode(new_dentry)), 1975e49c7b2fSDavid Howells new_dentry, op->key); 1976b4280812SJiapeng Chong if (ret) { 1977b4280812SJiapeng Chong op->error = ret; 1978e49c7b2fSDavid Howells goto error; 1979b4280812SJiapeng Chong } 1980e49c7b2fSDavid Howells 1981e49c7b2fSDavid Howells op->dentry_2 = op->rename.tmp; 1982e49c7b2fSDavid Howells op->rename.rehash = NULL; 1983e49c7b2fSDavid Howells op->rename.new_negative = true; 1984e49c7b2fSDavid Howells } 1985e49c7b2fSDavid Howells } 1986e49c7b2fSDavid Howells 1987e49c7b2fSDavid Howells /* This bit is potentially nasty as there's a potential race with 1988e49c7b2fSDavid Howells * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 1989e49c7b2fSDavid Howells * to reflect it's new parent's new data_version after the op, but 1990e49c7b2fSDavid Howells * d_revalidate may see old_dentry between the op having taken place 1991e49c7b2fSDavid Howells * and the version being updated. 1992e49c7b2fSDavid Howells * 1993e49c7b2fSDavid Howells * So drop the old_dentry for now to make other threads go through 1994e49c7b2fSDavid Howells * lookup instead - which we hold a lock against. 1995e49c7b2fSDavid Howells */ 1996e49c7b2fSDavid Howells d_drop(old_dentry); 1997e49c7b2fSDavid Howells 1998e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1999e49c7b2fSDavid Howells 2000260a9803SDavid Howells error: 2001e49c7b2fSDavid Howells return afs_put_operation(op); 2002260a9803SDavid Howells } 2003f3ddee8dSDavid Howells 2004f3ddee8dSDavid Howells /* 2005255ed636SDavid Howells * Release a directory folio and clean up its private state if it's not busy 2006255ed636SDavid Howells * - return true if the folio can now be released, false if not 2007f3ddee8dSDavid Howells */ 2008508cae68SMatthew Wilcox (Oracle) static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags) 2009f3ddee8dSDavid Howells { 2010255ed636SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); 2011f3ddee8dSDavid Howells 2012255ed636SDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio)); 2013f3ddee8dSDavid Howells 2014255ed636SDavid Howells folio_detach_private(folio); 2015f3ddee8dSDavid Howells 2016f3ddee8dSDavid Howells /* The directory will need reloading. */ 2017f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2018f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 2019255ed636SDavid Howells return true; 2020f3ddee8dSDavid Howells } 2021f3ddee8dSDavid Howells 2022f3ddee8dSDavid Howells /* 2023255ed636SDavid Howells * Invalidate part or all of a folio. 2024f3ddee8dSDavid Howells */ 2025f6bc6fb8SMatthew Wilcox (Oracle) static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, 2026f6bc6fb8SMatthew Wilcox (Oracle) size_t length) 2027f3ddee8dSDavid Howells { 2028255ed636SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); 2029f3ddee8dSDavid Howells 2030f6bc6fb8SMatthew Wilcox (Oracle) _enter("{%lu},%zu,%zu", folio->index, offset, length); 2031f3ddee8dSDavid Howells 2032255ed636SDavid Howells BUG_ON(!folio_test_locked(folio)); 2033f3ddee8dSDavid Howells 2034f3ddee8dSDavid Howells /* The directory will need reloading. */ 2035f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2036f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 2037f3ddee8dSDavid Howells 2038255ed636SDavid Howells /* we clean up only if the entire folio is being invalidated */ 2039255ed636SDavid Howells if (offset == 0 && length == folio_size(folio)) 2040255ed636SDavid Howells folio_detach_private(folio); 2041f3ddee8dSDavid Howells } 2042