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); 44f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 45*f6bc6fb8SMatthew Wilcox (Oracle) static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, 46*f6bc6fb8SMatthew Wilcox (Oracle) size_t length); 47f3ddee8dSDavid Howells 48f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 49f3ddee8dSDavid Howells { 50f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 51f3ddee8dSDavid Howells } 521da177e4SLinus Torvalds 534b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 541da177e4SLinus Torvalds .open = afs_dir_open, 5500d3b7a4SDavid Howells .release = afs_release, 5629884effSAl Viro .iterate_shared = afs_readdir, 57e8d6c554SDavid Howells .lock = afs_lock, 583222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 61754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 62260a9803SDavid Howells .create = afs_create, 63260a9803SDavid Howells .lookup = afs_lookup, 64260a9803SDavid Howells .link = afs_link, 65260a9803SDavid Howells .unlink = afs_unlink, 66260a9803SDavid Howells .symlink = afs_symlink, 67260a9803SDavid Howells .mkdir = afs_mkdir, 68260a9803SDavid Howells .rmdir = afs_rmdir, 692773bf00SMiklos Szeredi .rename = afs_rename, 7000d3b7a4SDavid Howells .permission = afs_permission, 71416351f2SDavid Howells .getattr = afs_getattr, 7231143d5dSDavid Howells .setattr = afs_setattr, 731da177e4SLinus Torvalds }; 741da177e4SLinus Torvalds 75f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 76f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 77f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 78*f6bc6fb8SMatthew Wilcox (Oracle) .invalidate_folio = afs_dir_invalidate_folio, 79f3ddee8dSDavid Howells }; 80f3ddee8dSDavid Howells 81d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 821da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 831da177e4SLinus Torvalds .d_delete = afs_d_delete, 84260a9803SDavid Howells .d_release = afs_d_release, 85d18610b0SDavid Howells .d_automount = afs_d_automount, 8679ddbfa5SDavid Howells .d_iput = afs_d_iput, 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 895cf9dd55SDavid Howells struct afs_lookup_one_cookie { 905cf9dd55SDavid Howells struct dir_context ctx; 915cf9dd55SDavid Howells struct qstr name; 925cf9dd55SDavid Howells bool found; 935cf9dd55SDavid Howells struct afs_fid fid; 945cf9dd55SDavid Howells }; 955cf9dd55SDavid Howells 96260a9803SDavid Howells struct afs_lookup_cookie { 971bbae9f8SAl Viro struct dir_context ctx; 981bbae9f8SAl Viro struct qstr name; 995cf9dd55SDavid Howells bool found; 1005cf9dd55SDavid Howells bool one_only; 1015cf9dd55SDavid Howells unsigned short nr_fids; 1025cf9dd55SDavid Howells struct afs_fid fids[50]; 1031da177e4SLinus Torvalds }; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds /* 106255ed636SDavid Howells * Drop the refs that we're holding on the folios we were reading into. We've 107c4508464SDavid Howells * got refs on the first nr_pages pages. 108c4508464SDavid Howells */ 109c4508464SDavid Howells static void afs_dir_read_cleanup(struct afs_read *req) 110c4508464SDavid Howells { 111c4508464SDavid Howells struct address_space *mapping = req->vnode->vfs_inode.i_mapping; 112255ed636SDavid Howells struct folio *folio; 113c4508464SDavid Howells pgoff_t last = req->nr_pages - 1; 114c4508464SDavid Howells 115c4508464SDavid Howells XA_STATE(xas, &mapping->i_pages, 0); 116c4508464SDavid Howells 117c4508464SDavid Howells if (unlikely(!req->nr_pages)) 118c4508464SDavid Howells return; 119c4508464SDavid Howells 120c4508464SDavid Howells rcu_read_lock(); 121255ed636SDavid Howells xas_for_each(&xas, folio, last) { 122255ed636SDavid Howells if (xas_retry(&xas, folio)) 123c4508464SDavid Howells continue; 124255ed636SDavid Howells BUG_ON(xa_is_value(folio)); 125255ed636SDavid Howells ASSERTCMP(folio_file_mapping(folio), ==, mapping); 126c4508464SDavid Howells 127255ed636SDavid Howells folio_put(folio); 128c4508464SDavid Howells } 129c4508464SDavid Howells 130c4508464SDavid Howells rcu_read_unlock(); 131c4508464SDavid Howells } 132c4508464SDavid Howells 133c4508464SDavid Howells /* 134255ed636SDavid Howells * check that a directory folio is valid 1351da177e4SLinus Torvalds */ 136255ed636SDavid Howells static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio, 137f3ddee8dSDavid Howells loff_t i_size) 1381da177e4SLinus Torvalds { 139255ed636SDavid Howells union afs_xdr_dir_block *block; 140255ed636SDavid Howells size_t offset, size; 141255ed636SDavid Howells loff_t pos; 1421da177e4SLinus Torvalds 143255ed636SDavid Howells /* Determine how many magic numbers there should be in this folio, but 144dab17c1aSDavid Howells * we must take care because the directory may change size under us. 145dab17c1aSDavid Howells */ 146255ed636SDavid Howells pos = folio_pos(folio); 147255ed636SDavid Howells if (i_size <= pos) 148dab17c1aSDavid Howells goto checked; 149dab17c1aSDavid Howells 150255ed636SDavid Howells size = min_t(loff_t, folio_size(folio), i_size - pos); 151255ed636SDavid Howells for (offset = 0; offset < size; offset += sizeof(*block)) { 152255ed636SDavid Howells block = kmap_local_folio(folio, offset); 153255ed636SDavid Howells if (block->hdr.magic != AFS_DIR_MAGIC) { 154255ed636SDavid Howells printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n", 155255ed636SDavid Howells __func__, dvnode->vfs_inode.i_ino, 156255ed636SDavid Howells pos, offset, size, ntohs(block->hdr.magic)); 157255ed636SDavid Howells trace_afs_dir_check_failed(dvnode, pos + offset, i_size); 158255ed636SDavid Howells kunmap_local(block); 159f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1601da177e4SLinus Torvalds goto error; 1611da177e4SLinus Torvalds } 16263a4681fSDavid Howells 16363a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 164255ed636SDavid Howells * use string functions on it. The filenames in the folio 16563a4681fSDavid Howells * *should* be NUL-terminated anyway. 16663a4681fSDavid Howells */ 167255ed636SDavid Howells ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0; 168255ed636SDavid Howells 169255ed636SDavid Howells kunmap_local(block); 1701da177e4SLinus Torvalds } 171dab17c1aSDavid Howells checked: 172f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 173be5b82dbSAl Viro return true; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds error: 176be5b82dbSAl Viro return false; 177ec26815aSDavid Howells } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds /* 180c4508464SDavid Howells * Dump the contents of a directory. 181445b1028SDavid Howells */ 182c4508464SDavid Howells static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req) 183445b1028SDavid Howells { 184255ed636SDavid Howells union afs_xdr_dir_block *block; 185c4508464SDavid Howells struct address_space *mapping = dvnode->vfs_inode.i_mapping; 186255ed636SDavid Howells struct folio *folio; 187c4508464SDavid Howells pgoff_t last = req->nr_pages - 1; 188255ed636SDavid Howells size_t offset, size; 189445b1028SDavid Howells 190c4508464SDavid Howells XA_STATE(xas, &mapping->i_pages, 0); 191445b1028SDavid Howells 192c4508464SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n", 193445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 194c4508464SDavid Howells req->file_size, req->len, req->actual_len); 195c4508464SDavid Howells pr_warn("DIR %llx %x %zx %zx\n", 196c4508464SDavid Howells req->pos, req->nr_pages, 197c4508464SDavid Howells req->iter->iov_offset, iov_iter_count(req->iter)); 198445b1028SDavid Howells 199255ed636SDavid Howells xas_for_each(&xas, folio, last) { 200255ed636SDavid Howells if (xas_retry(&xas, folio)) 201c4508464SDavid Howells continue; 202445b1028SDavid Howells 203255ed636SDavid Howells BUG_ON(folio_file_mapping(folio) != mapping); 204c4508464SDavid Howells 205255ed636SDavid Howells size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio)); 206255ed636SDavid Howells for (offset = 0; offset < size; offset += sizeof(*block)) { 207255ed636SDavid Howells block = kmap_local_folio(folio, offset); 208255ed636SDavid Howells pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block); 209255ed636SDavid Howells kunmap_local(block); 210445b1028SDavid Howells } 211445b1028SDavid Howells } 212c4508464SDavid Howells } 213c4508464SDavid Howells 214c4508464SDavid Howells /* 215255ed636SDavid Howells * Check all the blocks in a directory. All the folios are held pinned. 216c4508464SDavid Howells */ 217c4508464SDavid Howells static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req) 218c4508464SDavid Howells { 219c4508464SDavid Howells struct address_space *mapping = dvnode->vfs_inode.i_mapping; 220255ed636SDavid Howells struct folio *folio; 221c4508464SDavid Howells pgoff_t last = req->nr_pages - 1; 222c4508464SDavid Howells int ret = 0; 223c4508464SDavid Howells 224c4508464SDavid Howells XA_STATE(xas, &mapping->i_pages, 0); 225c4508464SDavid Howells 226c4508464SDavid Howells if (unlikely(!req->nr_pages)) 227c4508464SDavid Howells return 0; 228c4508464SDavid Howells 229c4508464SDavid Howells rcu_read_lock(); 230255ed636SDavid Howells xas_for_each(&xas, folio, last) { 231255ed636SDavid Howells if (xas_retry(&xas, folio)) 232c4508464SDavid Howells continue; 233c4508464SDavid Howells 234255ed636SDavid Howells BUG_ON(folio_file_mapping(folio) != mapping); 235c4508464SDavid Howells 236255ed636SDavid Howells if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) { 237c4508464SDavid Howells afs_dir_dump(dvnode, req); 238c4508464SDavid Howells ret = -EIO; 239c4508464SDavid Howells break; 240c4508464SDavid Howells } 241c4508464SDavid Howells } 242c4508464SDavid Howells 243c4508464SDavid Howells rcu_read_unlock(); 244c4508464SDavid Howells return ret; 245445b1028SDavid Howells } 246445b1028SDavid Howells 247445b1028SDavid Howells /* 2481da177e4SLinus Torvalds * open an AFS directory file 2491da177e4SLinus Torvalds */ 2501da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2511da177e4SLinus Torvalds { 2521da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2531da177e4SLinus Torvalds 25400317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 25500317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2561da177e4SLinus Torvalds 25708e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2581da177e4SLinus Torvalds return -ENOENT; 2591da177e4SLinus Torvalds 26000d3b7a4SDavid Howells return afs_open(inode, file); 261ec26815aSDavid Howells } 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* 264f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 265255ed636SDavid Howells * contents. The list of folios is returned, pinning them so that they don't 266f3ddee8dSDavid Howells * get reclaimed during the iteration. 267f3ddee8dSDavid Howells */ 268f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 269b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 270f3ddee8dSDavid Howells { 271255ed636SDavid Howells struct address_space *mapping = dvnode->vfs_inode.i_mapping; 272f3ddee8dSDavid Howells struct afs_read *req; 273f3ddee8dSDavid Howells loff_t i_size; 274255ed636SDavid Howells int nr_pages, i; 275c4508464SDavid Howells int ret; 276f3ddee8dSDavid Howells 277c4508464SDavid Howells _enter(""); 278f3ddee8dSDavid Howells 279c4508464SDavid Howells req = kzalloc(sizeof(*req), GFP_KERNEL); 280f3ddee8dSDavid Howells if (!req) 281f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 282f3ddee8dSDavid Howells 283f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 284c4508464SDavid Howells req->vnode = dvnode; 285c69bf479SDavid Howells req->key = key_get(key); 286c4508464SDavid Howells req->cleanup = afs_dir_read_cleanup; 287c4508464SDavid Howells 288c4508464SDavid Howells expand: 289c4508464SDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 290c4508464SDavid Howells if (i_size < 2048) { 291c4508464SDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_small); 292c4508464SDavid Howells goto error; 293c4508464SDavid Howells } 294c4508464SDavid Howells if (i_size > 2048 * 1024) { 295c4508464SDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 296c4508464SDavid Howells ret = -EFBIG; 297f3ddee8dSDavid Howells goto error; 298f3ddee8dSDavid Howells } 299f3ddee8dSDavid Howells 300c4508464SDavid Howells _enter("%llu", i_size); 301c4508464SDavid Howells 302c4508464SDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 303c4508464SDavid Howells 304c4508464SDavid Howells req->actual_len = i_size; /* May change */ 305c4508464SDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 306c4508464SDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 307c4508464SDavid Howells iov_iter_xarray(&req->def_iter, READ, &dvnode->vfs_inode.i_mapping->i_pages, 308c4508464SDavid Howells 0, i_size); 309c4508464SDavid Howells req->iter = &req->def_iter; 310c4508464SDavid Howells 311c4508464SDavid Howells /* Fill in any gaps that we might find where the memory reclaimer has 312255ed636SDavid Howells * been at work and pin all the folios. If there are any gaps, we will 313f3ddee8dSDavid Howells * need to reread the entire directory contents. 314f3ddee8dSDavid Howells */ 315c4508464SDavid Howells i = req->nr_pages; 316c4508464SDavid Howells while (i < nr_pages) { 317255ed636SDavid Howells struct folio *folio; 318c4508464SDavid Howells 319255ed636SDavid Howells folio = filemap_get_folio(mapping, i); 320255ed636SDavid Howells if (!folio) { 321f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 322f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 323f3ddee8dSDavid Howells 324f3ddee8dSDavid Howells ret = -ENOMEM; 325255ed636SDavid Howells folio = __filemap_get_folio(mapping, 326255ed636SDavid Howells i, FGP_LOCK | FGP_CREAT, 327255ed636SDavid Howells mapping->gfp_mask); 328255ed636SDavid Howells if (!folio) 329f3ddee8dSDavid Howells goto error; 330255ed636SDavid Howells folio_attach_private(folio, (void *)1); 331255ed636SDavid Howells folio_unlock(folio); 332f3ddee8dSDavid Howells } 333255ed636SDavid Howells 334255ed636SDavid Howells req->nr_pages += folio_nr_pages(folio); 335255ed636SDavid Howells i += folio_nr_pages(folio); 336c4508464SDavid Howells } 337f3ddee8dSDavid Howells 338f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 339f3ddee8dSDavid Howells * races. 340f3ddee8dSDavid Howells */ 341f3ddee8dSDavid Howells ret = -ERESTARTSYS; 342b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 343b61f7dcfSDavid Howells goto error; 344f3ddee8dSDavid Howells 345f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 346f3ddee8dSDavid Howells goto success; 347f3ddee8dSDavid Howells 348b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 349b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 350b61f7dcfSDavid Howells goto error; 351b61f7dcfSDavid Howells 352b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 35399987c56SDavid Howells trace_afs_reload_dir(dvnode); 354c69bf479SDavid Howells ret = afs_fetch_data(dvnode, req); 355f3ddee8dSDavid Howells if (ret < 0) 356b61f7dcfSDavid Howells goto error_unlock; 357f3ddee8dSDavid Howells 358f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 359f3ddee8dSDavid Howells 360c4508464SDavid Howells if (req->len < req->file_size) { 361c4508464SDavid Howells /* The content has grown, so we need to expand the 362c4508464SDavid Howells * buffer. 363c4508464SDavid Howells */ 364c4508464SDavid Howells up_write(&dvnode->validate_lock); 365c4508464SDavid Howells goto expand; 366c4508464SDavid Howells } 367f3ddee8dSDavid Howells 368f3ddee8dSDavid Howells /* Validate the data we just read. */ 369c4508464SDavid Howells ret = afs_dir_check(dvnode, req); 370c4508464SDavid Howells if (ret < 0) 371b61f7dcfSDavid Howells goto error_unlock; 372f3ddee8dSDavid Howells 373f3ddee8dSDavid Howells // TODO: Trim excess pages 374f3ddee8dSDavid Howells 375f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 376f3ddee8dSDavid Howells } 377f3ddee8dSDavid Howells 378b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 379f3ddee8dSDavid Howells success: 380f3ddee8dSDavid Howells return req; 381f3ddee8dSDavid Howells 382f3ddee8dSDavid Howells error_unlock: 383b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 384f3ddee8dSDavid Howells error: 385f3ddee8dSDavid Howells afs_put_read(req); 386f3ddee8dSDavid Howells _leave(" = %d", ret); 387f3ddee8dSDavid Howells return ERR_PTR(ret); 388f3ddee8dSDavid Howells } 389f3ddee8dSDavid Howells 390f3ddee8dSDavid Howells /* 3911da177e4SLinus Torvalds * deal with one block in an AFS directory 3921da177e4SLinus Torvalds */ 393f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 394f51375cdSDavid Howells struct dir_context *ctx, 39500317636SDavid Howells union afs_xdr_dir_block *block, 3961bbae9f8SAl Viro unsigned blkoff) 3971da177e4SLinus Torvalds { 39800317636SDavid Howells union afs_xdr_dirent *dire; 399366911cdSDavid Howells unsigned offset, next, curr, nr_slots; 4001da177e4SLinus Torvalds size_t nlen; 4011bbae9f8SAl Viro int tmp; 4021da177e4SLinus Torvalds 403255ed636SDavid Howells _enter("%llx,%x", ctx->pos, blkoff); 4041da177e4SLinus Torvalds 40500317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 4084ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 4094ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 4101da177e4SLinus Torvalds offset = next 4111da177e4SLinus Torvalds ) { 4121da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 41300317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 4141da177e4SLinus Torvalds (1 << (offset % 8)))) { 4155b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 41600317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 417366911cdSDavid Howells next = offset + 1; 4181da177e4SLinus Torvalds if (offset >= curr) 4191bbae9f8SAl Viro ctx->pos = blkoff + 42000317636SDavid Howells next * sizeof(union afs_xdr_dirent); 4211da177e4SLinus Torvalds continue; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* got a valid entry */ 4251da177e4SLinus Torvalds dire = &block->dirents[offset]; 4261da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 4271da177e4SLinus Torvalds sizeof(*block) - 42800317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 429366911cdSDavid Howells if (nlen > AFSNAMEMAX - 1) { 430366911cdSDavid Howells _debug("ENT[%zu]: name too long (len %u/%zu)", 431366911cdSDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 432366911cdSDavid Howells offset, nlen); 433366911cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_name_too_long); 434366911cdSDavid Howells } 4351da177e4SLinus Torvalds 4365b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 43700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 4381da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 4391da177e4SLinus Torvalds nlen, dire->u.name); 4401da177e4SLinus Torvalds 441366911cdSDavid Howells nr_slots = afs_dir_calc_slots(nlen); 442366911cdSDavid Howells next = offset + nr_slots; 443366911cdSDavid Howells if (next > AFS_DIR_SLOTS_PER_BLOCK) { 4445b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 445366911cdSDavid Howells " %u extends beyond end dir block" 446366911cdSDavid Howells " (len %zu)", 44700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 448366911cdSDavid Howells offset, next, nlen); 449f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4501da177e4SLinus Torvalds } 451366911cdSDavid Howells 452366911cdSDavid Howells /* Check that the name-extension dirents are all allocated */ 453366911cdSDavid Howells for (tmp = 1; tmp < nr_slots; tmp++) { 454366911cdSDavid Howells unsigned int ix = offset + tmp; 455366911cdSDavid Howells if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) { 456366911cdSDavid Howells _debug("ENT[%zu.u]:" 457366911cdSDavid Howells " %u unmarked extension (%u/%u)", 45800317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 459366911cdSDavid Howells offset, tmp, nr_slots); 460f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds /* skip if starts before the current position */ 4651da177e4SLinus Torvalds if (offset < curr) 4661da177e4SLinus Torvalds continue; 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds /* found the next entry */ 4691bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4701da177e4SLinus Torvalds ntohl(dire->u.vnode), 4715cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4725cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4731bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4741da177e4SLinus Torvalds _leave(" = 0 [full]"); 4751da177e4SLinus Torvalds return 0; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 47800317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds _leave(" = 1 [more]"); 4821da177e4SLinus Torvalds return 1; 483ec26815aSDavid Howells } 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds /* 48608e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4871da177e4SLinus Torvalds */ 4881bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4899dd0b82eSDavid Howells struct key *key, afs_dataversion_t *_dir_version) 4901da177e4SLinus Torvalds { 491f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 49200317636SDavid Howells union afs_xdr_dir_block *dblock; 493f3ddee8dSDavid Howells struct afs_read *req; 494255ed636SDavid Howells struct folio *folio; 495255ed636SDavid Howells unsigned offset, size; 4961da177e4SLinus Torvalds int ret; 4971da177e4SLinus Torvalds 4981bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4991da177e4SLinus Torvalds 50008e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 5011da177e4SLinus Torvalds _leave(" = -ESTALE"); 5021da177e4SLinus Torvalds return -ESTALE; 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 505f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 506f3ddee8dSDavid Howells if (IS_ERR(req)) 507f3ddee8dSDavid Howells return PTR_ERR(req); 5089dd0b82eSDavid Howells *_dir_version = req->data_version; 509f3ddee8dSDavid Howells 5101da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 51100317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 51200317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /* walk through the blocks in sequence */ 5151da177e4SLinus Torvalds ret = 0; 516f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 517255ed636SDavid Howells /* Fetch the appropriate folio from the directory and re-add it 518c4508464SDavid Howells * to the LRU. We have all the pages pinned with an extra ref. 519f3ddee8dSDavid Howells */ 520255ed636SDavid Howells folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE, 521255ed636SDavid Howells FGP_ACCESSED, 0); 522255ed636SDavid Howells if (!folio) { 523f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 5241da177e4SLinus Torvalds break; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 527255ed636SDavid Howells offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio); 528255ed636SDavid Howells size = min_t(loff_t, folio_size(folio), 529255ed636SDavid Howells req->actual_len - folio_file_pos(folio)); 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds do { 532255ed636SDavid Howells dblock = kmap_local_folio(folio, offset); 533255ed636SDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, 534255ed636SDavid Howells folio_file_pos(folio) + offset); 535255ed636SDavid Howells kunmap_local(dblock); 536255ed636SDavid Howells if (ret != 1) 5371da177e4SLinus Torvalds goto out; 5381da177e4SLinus Torvalds 539255ed636SDavid Howells } while (offset += sizeof(*dblock), offset < size); 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds ret = 0; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds out: 545b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 546f3ddee8dSDavid Howells afs_put_read(req); 5471da177e4SLinus Torvalds _leave(" = %d", ret); 5481da177e4SLinus Torvalds return ret; 549ec26815aSDavid Howells } 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds /* 5521da177e4SLinus Torvalds * read an AFS directory 5531da177e4SLinus Torvalds */ 5541bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5551da177e4SLinus Torvalds { 5569dd0b82eSDavid Howells afs_dataversion_t dir_version; 5579dd0b82eSDavid Howells 5589dd0b82eSDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 5599dd0b82eSDavid Howells &dir_version); 560ec26815aSDavid Howells } 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds /* 5635cf9dd55SDavid Howells * Search the directory for a single name 5641da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5651da177e4SLinus Torvalds * uniquifier through dtype 5661da177e4SLinus Torvalds */ 5675cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 568ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5691da177e4SLinus Torvalds { 5705cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5715cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5721da177e4SLinus Torvalds 5731bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5741bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 575ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5761da177e4SLinus Torvalds 57708e0e7c8SDavid Howells /* insanity checks first */ 57800317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 57900317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 58008e0e7c8SDavid Howells 5811bbae9f8SAl Viro if (cookie->name.len != nlen || 5821bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5831da177e4SLinus Torvalds _leave(" = 0 [no]"); 5841da177e4SLinus Torvalds return 0; 5851da177e4SLinus Torvalds } 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds cookie->fid.vnode = ino; 5881da177e4SLinus Torvalds cookie->fid.unique = dtype; 5891da177e4SLinus Torvalds cookie->found = 1; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds _leave(" = -1 [found]"); 5921da177e4SLinus Torvalds return -1; 593ec26815aSDavid Howells } 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /* 5965cf9dd55SDavid Howells * Do a lookup of a single name in a directory 597260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5981da177e4SLinus Torvalds */ 5995cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 6009dd0b82eSDavid Howells struct afs_fid *fid, struct key *key, 6019dd0b82eSDavid Howells afs_dataversion_t *_dir_version) 6021da177e4SLinus Torvalds { 6031bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 6045cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 6055cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 6061bbae9f8SAl Viro .name = dentry->d_name, 6071bbae9f8SAl Viro .fid.vid = as->volume->vid 6081bbae9f8SAl Viro }; 6091da177e4SLinus Torvalds int ret; 6101da177e4SLinus Torvalds 611a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds /* search the directory */ 6149dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 6151da177e4SLinus Torvalds if (ret < 0) { 61608e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 61708e0e7c8SDavid Howells return ret; 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds if (!cookie.found) { 62108e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 62208e0e7c8SDavid Howells return -ENOENT; 62308e0e7c8SDavid Howells } 62408e0e7c8SDavid Howells 62508e0e7c8SDavid Howells *fid = cookie.fid; 6263b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 62708e0e7c8SDavid Howells return 0; 62808e0e7c8SDavid Howells } 62908e0e7c8SDavid Howells 63008e0e7c8SDavid Howells /* 6315cf9dd55SDavid Howells * search the directory for a name 6325cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 6335cf9dd55SDavid Howells * uniquifier through dtype 6345cf9dd55SDavid Howells */ 6355cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 6365cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 6375cf9dd55SDavid Howells { 6385cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6395cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6405cf9dd55SDavid Howells int ret; 6415cf9dd55SDavid Howells 6425cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6435cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6445cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6455cf9dd55SDavid Howells 6465cf9dd55SDavid Howells /* insanity checks first */ 64700317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 64800317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6495cf9dd55SDavid Howells 6505cf9dd55SDavid Howells if (cookie->found) { 6515cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6525cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6535cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6545cf9dd55SDavid Howells cookie->nr_fids++; 6555cf9dd55SDavid Howells } 6565cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6575cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 658e49c7b2fSDavid Howells cookie->fids[1].vnode = ino; 659e49c7b2fSDavid Howells cookie->fids[1].unique = dtype; 6605cf9dd55SDavid Howells cookie->found = 1; 6615cf9dd55SDavid Howells if (cookie->one_only) 6625cf9dd55SDavid Howells return -1; 6635cf9dd55SDavid Howells } 6645cf9dd55SDavid Howells 6655cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6665cf9dd55SDavid Howells _leave(" = %d", ret); 6675cf9dd55SDavid Howells return ret; 6685cf9dd55SDavid Howells } 6695cf9dd55SDavid Howells 6705cf9dd55SDavid Howells /* 671e49c7b2fSDavid Howells * Deal with the result of a successful lookup operation. Turn all the files 672e49c7b2fSDavid Howells * into inodes and save the first one - which is the one we actually want. 673e49c7b2fSDavid Howells */ 674e49c7b2fSDavid Howells static void afs_do_lookup_success(struct afs_operation *op) 675e49c7b2fSDavid Howells { 676e49c7b2fSDavid Howells struct afs_vnode_param *vp; 677e49c7b2fSDavid Howells struct afs_vnode *vnode; 678e49c7b2fSDavid Howells struct inode *inode; 679e49c7b2fSDavid Howells u32 abort_code; 680e49c7b2fSDavid Howells int i; 681e49c7b2fSDavid Howells 682e49c7b2fSDavid Howells _enter(""); 683e49c7b2fSDavid Howells 684e49c7b2fSDavid Howells for (i = 0; i < op->nr_files; i++) { 685e49c7b2fSDavid Howells switch (i) { 686e49c7b2fSDavid Howells case 0: 687e49c7b2fSDavid Howells vp = &op->file[0]; 688e49c7b2fSDavid Howells abort_code = vp->scb.status.abort_code; 689e49c7b2fSDavid Howells if (abort_code != 0) { 69044767c35SDavid Howells op->ac.abort_code = abort_code; 691e49c7b2fSDavid Howells op->error = afs_abort_to_error(abort_code); 692e49c7b2fSDavid Howells } 693e49c7b2fSDavid Howells break; 694e49c7b2fSDavid Howells 695e49c7b2fSDavid Howells case 1: 696e49c7b2fSDavid Howells vp = &op->file[1]; 697e49c7b2fSDavid Howells break; 698e49c7b2fSDavid Howells 699e49c7b2fSDavid Howells default: 700e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 701e49c7b2fSDavid Howells break; 702e49c7b2fSDavid Howells } 703e49c7b2fSDavid Howells 704e49c7b2fSDavid Howells if (!vp->scb.have_status && !vp->scb.have_error) 705e49c7b2fSDavid Howells continue; 706e49c7b2fSDavid Howells 707e49c7b2fSDavid Howells _debug("do [%u]", i); 708e49c7b2fSDavid Howells if (vp->vnode) { 709e49c7b2fSDavid Howells if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) 710e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 711e49c7b2fSDavid Howells } else if (vp->scb.status.abort_code == 0) { 712e49c7b2fSDavid Howells inode = afs_iget(op, vp); 713e49c7b2fSDavid Howells if (!IS_ERR(inode)) { 714e49c7b2fSDavid Howells vnode = AFS_FS_I(inode); 715e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, 716e49c7b2fSDavid Howells 0 /* Assume vnode->cb_break is 0 */ + 717e49c7b2fSDavid Howells op->cb_v_break, 718e49c7b2fSDavid Howells &vp->scb); 719e49c7b2fSDavid Howells vp->vnode = vnode; 720e49c7b2fSDavid Howells vp->put_vnode = true; 721e49c7b2fSDavid Howells } 722e49c7b2fSDavid Howells } else { 723e49c7b2fSDavid Howells _debug("- abort %d %llx:%llx.%x", 724e49c7b2fSDavid Howells vp->scb.status.abort_code, 725e49c7b2fSDavid Howells vp->fid.vid, vp->fid.vnode, vp->fid.unique); 726e49c7b2fSDavid Howells } 727e49c7b2fSDavid Howells } 728e49c7b2fSDavid Howells 729e49c7b2fSDavid Howells _leave(""); 730e49c7b2fSDavid Howells } 731e49c7b2fSDavid Howells 732e49c7b2fSDavid Howells static const struct afs_operation_ops afs_inline_bulk_status_operation = { 733e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_inline_bulk_status, 734e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_inline_bulk_status, 735e49c7b2fSDavid Howells .success = afs_do_lookup_success, 736e49c7b2fSDavid Howells }; 737e49c7b2fSDavid Howells 738b6489a49SDavid Howells static const struct afs_operation_ops afs_lookup_fetch_status_operation = { 739e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_fetch_status, 740e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_fetch_status, 741e49c7b2fSDavid Howells .success = afs_do_lookup_success, 742728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 743e49c7b2fSDavid Howells }; 744e49c7b2fSDavid Howells 745e49c7b2fSDavid Howells /* 74620325960SDavid Howells * See if we know that the server we expect to use doesn't support 74720325960SDavid Howells * FS.InlineBulkStatus. 74820325960SDavid Howells */ 74920325960SDavid Howells static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) 75020325960SDavid Howells { 75120325960SDavid Howells struct afs_server_list *slist; 75220325960SDavid Howells struct afs_volume *volume = dvnode->volume; 75320325960SDavid Howells struct afs_server *server; 75420325960SDavid Howells bool ret = true; 75520325960SDavid Howells int i; 75620325960SDavid Howells 75720325960SDavid Howells if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) 75820325960SDavid Howells return true; 75920325960SDavid Howells 76020325960SDavid Howells rcu_read_lock(); 76120325960SDavid Howells slist = rcu_dereference(volume->servers); 76220325960SDavid Howells 76320325960SDavid Howells for (i = 0; i < slist->nr_servers; i++) { 76420325960SDavid Howells server = slist->servers[i].server; 76520325960SDavid Howells if (server == dvnode->cb_server) { 76620325960SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 76720325960SDavid Howells ret = false; 76820325960SDavid Howells break; 76920325960SDavid Howells } 77020325960SDavid Howells } 77120325960SDavid Howells 77220325960SDavid Howells rcu_read_unlock(); 77320325960SDavid Howells return ret; 77420325960SDavid Howells } 77520325960SDavid Howells 77620325960SDavid Howells /* 7775cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 7785cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 7795cf9dd55SDavid Howells * asked for is returned. 7805cf9dd55SDavid Howells */ 7815cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 7825cf9dd55SDavid Howells struct key *key) 7835cf9dd55SDavid Howells { 7845cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 785e49c7b2fSDavid Howells struct afs_vnode_param *vp; 786e49c7b2fSDavid Howells struct afs_operation *op; 78739db9815SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 78839db9815SDavid Howells struct inode *inode = NULL, *ti; 7899dd0b82eSDavid Howells afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 790e49c7b2fSDavid Howells long ret; 791e49c7b2fSDavid Howells int i; 7925cf9dd55SDavid Howells 7935cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 7945cf9dd55SDavid Howells 7955cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 7965cf9dd55SDavid Howells if (!cookie) 7975cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 7985cf9dd55SDavid Howells 799e49c7b2fSDavid Howells for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) 800e49c7b2fSDavid Howells cookie->fids[i].vid = dvnode->fid.vid; 8015cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 8025cf9dd55SDavid Howells cookie->name = dentry->d_name; 80313fcc635SDavid Howells cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want 80413fcc635SDavid Howells * and slot 1 for the directory */ 8055cf9dd55SDavid Howells 80620325960SDavid Howells if (!afs_server_supports_ibulk(dvnode)) 8075cf9dd55SDavid Howells cookie->one_only = true; 8085cf9dd55SDavid Howells 8095cf9dd55SDavid Howells /* search the directory */ 8109dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 811e49c7b2fSDavid Howells if (ret < 0) 8125cf9dd55SDavid Howells goto out; 8135cf9dd55SDavid Howells 8149dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)data_version; 8159dd0b82eSDavid Howells 816e49c7b2fSDavid Howells ret = -ENOENT; 8175cf9dd55SDavid Howells if (!cookie->found) 8185cf9dd55SDavid Howells goto out; 8195cf9dd55SDavid Howells 8205cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 821e49c7b2fSDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, 822e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &cookie->fids[1]); 8235cf9dd55SDavid Howells if (inode) 824e49c7b2fSDavid Howells goto out; /* We do */ 825e49c7b2fSDavid Howells 826e49c7b2fSDavid Howells /* Okay, we didn't find it. We need to query the server - and whilst 827e49c7b2fSDavid Howells * we're doing that, we're going to attempt to look up a bunch of other 828e49c7b2fSDavid Howells * vnodes also. 829e49c7b2fSDavid Howells */ 830e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 831e49c7b2fSDavid Howells if (IS_ERR(op)) { 832e49c7b2fSDavid Howells ret = PTR_ERR(op); 8335cf9dd55SDavid Howells goto out; 834e49c7b2fSDavid Howells } 835e49c7b2fSDavid Howells 836e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 837e49c7b2fSDavid Howells afs_op_set_fid(op, 1, &cookie->fids[1]); 838e49c7b2fSDavid Howells 839e49c7b2fSDavid Howells op->nr_files = cookie->nr_fids; 840e49c7b2fSDavid Howells _debug("nr_files %u", op->nr_files); 8415cf9dd55SDavid Howells 8425cf9dd55SDavid Howells /* Need space for examining all the selected files */ 843e49c7b2fSDavid Howells op->error = -ENOMEM; 844e49c7b2fSDavid Howells if (op->nr_files > 2) { 845e49c7b2fSDavid Howells op->more_files = kvcalloc(op->nr_files - 2, 846e49c7b2fSDavid Howells sizeof(struct afs_vnode_param), 8475cf9dd55SDavid Howells GFP_KERNEL); 848e49c7b2fSDavid Howells if (!op->more_files) 849e49c7b2fSDavid Howells goto out_op; 8505cf9dd55SDavid Howells 851e49c7b2fSDavid Howells for (i = 2; i < op->nr_files; i++) { 852e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 853e49c7b2fSDavid Howells vp->fid = cookie->fids[i]; 85439db9815SDavid Howells 85539db9815SDavid Howells /* Find any inodes that already exist and get their 85639db9815SDavid Howells * callback counters. 85739db9815SDavid Howells */ 858e49c7b2fSDavid Howells ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, 859e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &vp->fid); 86039db9815SDavid Howells if (!IS_ERR_OR_NULL(ti)) { 86139db9815SDavid Howells vnode = AFS_FS_I(ti); 862e49c7b2fSDavid Howells vp->dv_before = vnode->status.data_version; 863e49c7b2fSDavid Howells vp->cb_break_before = afs_calc_vnode_cb_break(vnode); 864e49c7b2fSDavid Howells vp->vnode = vnode; 865e49c7b2fSDavid Howells vp->put_vnode = true; 866a9e5c87cSDavid Howells vp->speculative = true; /* vnode not locked */ 867e49c7b2fSDavid Howells } 86839db9815SDavid Howells } 86939db9815SDavid Howells } 87039db9815SDavid Howells 8715cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 8725cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 8735cf9dd55SDavid Howells * the whole operation. 8745cf9dd55SDavid Howells */ 875e49c7b2fSDavid Howells op->error = -ENOTSUPP; 876e49c7b2fSDavid Howells if (!cookie->one_only) { 877e49c7b2fSDavid Howells op->ops = &afs_inline_bulk_status_operation; 878e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 879e49c7b2fSDavid Howells afs_wait_for_operation(op); 8805cf9dd55SDavid Howells } 8815cf9dd55SDavid Howells 882e49c7b2fSDavid Howells if (op->error == -ENOTSUPP) { 883e49c7b2fSDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire 884e49c7b2fSDavid Howells * op if any of the lookups fails - so, for the moment, revert 885e49c7b2fSDavid Howells * to FS.FetchStatus for op->file[1]. 8865cf9dd55SDavid Howells */ 887e49c7b2fSDavid Howells op->fetch_status.which = 1; 888f8ea5c7bSDavid Howells op->ops = &afs_lookup_fetch_status_operation; 889e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 890e49c7b2fSDavid Howells afs_wait_for_operation(op); 891e49c7b2fSDavid Howells } 892e49c7b2fSDavid Howells inode = ERR_PTR(op->error); 893e49c7b2fSDavid Howells 894e49c7b2fSDavid Howells out_op: 895e49c7b2fSDavid Howells if (op->error == 0) { 896e49c7b2fSDavid Howells inode = &op->file[1].vnode->vfs_inode; 897e49c7b2fSDavid Howells op->file[1].vnode = NULL; 8985cf9dd55SDavid Howells } 8995cf9dd55SDavid Howells 900e49c7b2fSDavid Howells if (op->file[0].scb.have_status) 901e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; 902e49c7b2fSDavid Howells else 903e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; 904e49c7b2fSDavid Howells ret = afs_put_operation(op); 9055cf9dd55SDavid Howells out: 9065cf9dd55SDavid Howells kfree(cookie); 907e49c7b2fSDavid Howells _leave(""); 908e49c7b2fSDavid Howells return inode ?: ERR_PTR(ret); 9095cf9dd55SDavid Howells } 9105cf9dd55SDavid Howells 9115cf9dd55SDavid Howells /* 9126f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 9136f8880d8SDavid Howells */ 9146f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 9156f8880d8SDavid Howells struct key *key) 9166f8880d8SDavid Howells { 9176f8880d8SDavid Howells struct afs_sysnames *subs; 9186f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 9196f8880d8SDavid Howells struct dentry *ret; 9206f8880d8SDavid Howells char *buf, *p, *name; 9216f8880d8SDavid Howells int len, i; 9226f8880d8SDavid Howells 9236f8880d8SDavid Howells _enter(""); 9246f8880d8SDavid Howells 9256f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 9266f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 9276f8880d8SDavid Howells if (!buf) 9286f8880d8SDavid Howells goto out_p; 9296f8880d8SDavid Howells if (dentry->d_name.len > 4) { 9306f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 9316f8880d8SDavid Howells p += dentry->d_name.len - 4; 9326f8880d8SDavid Howells } 9336f8880d8SDavid Howells 9346f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 9356f8880d8SDavid Howells read_lock(&net->sysnames_lock); 9366f8880d8SDavid Howells subs = net->sysnames; 9376f8880d8SDavid Howells refcount_inc(&subs->usage); 9386f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 9396f8880d8SDavid Howells 9406f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 9416f8880d8SDavid Howells name = subs->subs[i]; 9426f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 9436f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 9446f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 9456f8880d8SDavid Howells goto out_s; 9466f8880d8SDavid Howells } 9476f8880d8SDavid Howells 9486f8880d8SDavid Howells strcpy(p, name); 9496f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 9506f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 9516f8880d8SDavid Howells goto out_s; 9526f8880d8SDavid Howells dput(ret); 9536f8880d8SDavid Howells } 9546f8880d8SDavid Howells 9556f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 9566f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 9576f8880d8SDavid Howells */ 9586f8880d8SDavid Howells ret = NULL; 9596f8880d8SDavid Howells out_s: 9606f8880d8SDavid Howells afs_put_sysnames(subs); 9616f8880d8SDavid Howells kfree(buf); 9626f8880d8SDavid Howells out_p: 9636f8880d8SDavid Howells key_put(key); 9646f8880d8SDavid Howells return ret; 9656f8880d8SDavid Howells } 9666f8880d8SDavid Howells 9676f8880d8SDavid Howells /* 96808e0e7c8SDavid Howells * look up an entry in a directory 96908e0e7c8SDavid Howells */ 970260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 97100cd8dd3SAl Viro unsigned int flags) 97208e0e7c8SDavid Howells { 9735cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 97440a708bdSDavid Howells struct afs_fid fid = {}; 97508e0e7c8SDavid Howells struct inode *inode; 97634b2a88fSAl Viro struct dentry *d; 97700d3b7a4SDavid Howells struct key *key; 97808e0e7c8SDavid Howells int ret; 97908e0e7c8SDavid Howells 9803b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 9815cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 982260a9803SDavid Howells 9832b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 98408e0e7c8SDavid Howells 98545222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 98608e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 98708e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 98808e0e7c8SDavid Howells } 98908e0e7c8SDavid Howells 9905cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 99108e0e7c8SDavid Howells _leave(" = -ESTALE"); 99208e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 99308e0e7c8SDavid Howells } 99408e0e7c8SDavid Howells 9955cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 99600d3b7a4SDavid Howells if (IS_ERR(key)) { 99700d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 998e231c2eeSDavid Howells return ERR_CAST(key); 99900d3b7a4SDavid Howells } 100000d3b7a4SDavid Howells 10015cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 100208e0e7c8SDavid Howells if (ret < 0) { 100300d3b7a4SDavid Howells key_put(key); 1004260a9803SDavid Howells _leave(" = %d [val]", ret); 10051da177e4SLinus Torvalds return ERR_PTR(ret); 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds 10086f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 10096f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 10106f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 10116f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 10126f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 10136f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 10146f8880d8SDavid Howells 1015d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 10165cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 101734b2a88fSAl Viro key_put(key); 1018f52b83b0SDavid Howells if (inode == ERR_PTR(-ENOENT)) 10195cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 102040a708bdSDavid Howells 102140a708bdSDavid Howells if (!IS_ERR_OR_NULL(inode)) 102240a708bdSDavid Howells fid = AFS_FS_I(inode)->fid; 102340a708bdSDavid Howells 1024fed79fd7SDavid Howells _debug("splice %p", dentry->d_inode); 102534b2a88fSAl Viro d = d_splice_alias(inode, dentry); 102680548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 102734b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 102840a708bdSDavid Howells trace_afs_lookup(dvnode, &d->d_name, &fid); 102980548b03SDavid Howells } else { 103040a708bdSDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, &fid); 103180548b03SDavid Howells } 1032e49c7b2fSDavid Howells _leave(""); 103334b2a88fSAl Viro return d; 1034ec26815aSDavid Howells } 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds /* 1037a0753c29SDavid Howells * Check the validity of a dentry under RCU conditions. 1038a0753c29SDavid Howells */ 1039a0753c29SDavid Howells static int afs_d_revalidate_rcu(struct dentry *dentry) 1040a0753c29SDavid Howells { 104163d49d84SDavid Howells struct afs_vnode *dvnode; 1042a0753c29SDavid Howells struct dentry *parent; 104363d49d84SDavid Howells struct inode *dir; 1044a0753c29SDavid Howells long dir_version, de_version; 1045a0753c29SDavid Howells 1046a0753c29SDavid Howells _enter("%p", dentry); 1047a0753c29SDavid Howells 1048a0753c29SDavid Howells /* Check the parent directory is still valid first. */ 1049a0753c29SDavid Howells parent = READ_ONCE(dentry->d_parent); 1050a0753c29SDavid Howells dir = d_inode_rcu(parent); 1051a0753c29SDavid Howells if (!dir) 1052a0753c29SDavid Howells return -ECHILD; 1053a0753c29SDavid Howells dvnode = AFS_FS_I(dir); 1054a0753c29SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 1055a0753c29SDavid Howells return -ECHILD; 1056a0753c29SDavid Howells 1057a0753c29SDavid Howells if (!afs_check_validity(dvnode)) 1058a0753c29SDavid Howells return -ECHILD; 1059a0753c29SDavid Howells 1060a0753c29SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1061a0753c29SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1062a0753c29SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1063a0753c29SDavid Howells * version. 1064a0753c29SDavid Howells */ 1065a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->status.data_version); 1066a0753c29SDavid Howells de_version = (long)READ_ONCE(dentry->d_fsdata); 1067a0753c29SDavid Howells if (de_version != dir_version) { 1068a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->invalid_before); 1069a0753c29SDavid Howells if (de_version - dir_version < 0) 1070a0753c29SDavid Howells return -ECHILD; 1071a0753c29SDavid Howells } 1072a0753c29SDavid Howells 1073a0753c29SDavid Howells return 1; /* Still valid */ 1074a0753c29SDavid Howells } 1075a0753c29SDavid Howells 1076a0753c29SDavid Howells /* 10771da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 10781da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 10791da177e4SLinus Torvalds * inode 10801da177e4SLinus Torvalds */ 10810b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 10821da177e4SLinus Torvalds { 1083260a9803SDavid Howells struct afs_vnode *vnode, *dir; 10843f649ab7SKees Cook struct afs_fid fid; 10851da177e4SLinus Torvalds struct dentry *parent; 1086c435ee34SDavid Howells struct inode *inode; 108700d3b7a4SDavid Howells struct key *key; 108840fc8102SDavid Howells afs_dataversion_t dir_version, invalid_before; 10899dd0b82eSDavid Howells long de_version; 10901da177e4SLinus Torvalds int ret; 10911da177e4SLinus Torvalds 10920b728e19SAl Viro if (flags & LOOKUP_RCU) 1093a0753c29SDavid Howells return afs_d_revalidate_rcu(dentry); 109434286d66SNick Piggin 1095c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 10962b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 10973b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1098a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 1099260a9803SDavid Howells vnode->flags); 1100c435ee34SDavid Howells } else { 1101a455589fSAl Viro _enter("{neg n=%pd}", dentry); 1102c435ee34SDavid Howells } 11031da177e4SLinus Torvalds 1104260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 110500d3b7a4SDavid Howells if (IS_ERR(key)) 110600d3b7a4SDavid Howells key = NULL; 110700d3b7a4SDavid Howells 110863d49d84SDavid Howells /* Hold the parent dentry so we can peer at it */ 110908e0e7c8SDavid Howells parent = dget_parent(dentry); 11102b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 11111da177e4SLinus Torvalds 1112260a9803SDavid Howells /* validate the parent directory */ 1113260a9803SDavid Howells afs_validate(dir, key); 1114260a9803SDavid Howells 1115260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1116a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 111763d49d84SDavid Howells goto not_found; 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds 1120a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1121a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1122a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1123a4ff7401SDavid Howells * version. 1124a4ff7401SDavid Howells */ 11259dd0b82eSDavid Howells dir_version = dir->status.data_version; 1126a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 11279dd0b82eSDavid Howells if (de_version == (long)dir_version) 11285dc84855SDavid Howells goto out_valid_noupdate; 1129a4ff7401SDavid Howells 113040fc8102SDavid Howells invalid_before = dir->invalid_before; 113140fc8102SDavid Howells if (de_version - (long)invalid_before >= 0) 1132a4ff7401SDavid Howells goto out_valid; 1133260a9803SDavid Howells 113408e0e7c8SDavid Howells _debug("dir modified"); 1135d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 11361da177e4SLinus Torvalds 11371da177e4SLinus Torvalds /* search the directory for this vnode */ 11389dd0b82eSDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); 1139260a9803SDavid Howells switch (ret) { 1140260a9803SDavid Howells case 0: 1141260a9803SDavid Howells /* the filename maps to something */ 11422b0143b5SDavid Howells if (d_really_is_negative(dentry)) 114363d49d84SDavid Howells goto not_found; 1144c435ee34SDavid Howells inode = d_inode(dentry); 1145c435ee34SDavid Howells if (is_bad_inode(inode)) { 1146a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1147a455589fSAl Viro dentry); 114863d49d84SDavid Howells goto not_found; 11491da177e4SLinus Torvalds } 11501da177e4SLinus Torvalds 1151c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1152c435ee34SDavid Howells 11531da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 11541da177e4SLinus Torvalds * different file */ 115508e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 11563b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1157a455589fSAl Viro dentry, fid.vnode, 115808e0e7c8SDavid Howells vnode->fid.vnode); 11591da177e4SLinus Torvalds goto not_found; 11601da177e4SLinus Torvalds } 11611da177e4SLinus Torvalds 11621da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1163260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1164260a9803SDavid Howells * been reused */ 116508e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1166a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1167a455589fSAl Viro dentry, fid.unique, 11687a224228SJean Noel Cordenner vnode->fid.unique, 1169c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1170260a9803SDavid Howells goto not_found; 1171260a9803SDavid Howells } 1172260a9803SDavid Howells goto out_valid; 1173260a9803SDavid Howells 1174260a9803SDavid Howells case -ENOENT: 1175260a9803SDavid Howells /* the filename is unknown */ 1176a455589fSAl Viro _debug("%pd: dirent not found", dentry); 11772b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1178260a9803SDavid Howells goto not_found; 1179260a9803SDavid Howells goto out_valid; 1180260a9803SDavid Howells 1181260a9803SDavid Howells default: 1182a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1183a455589fSAl Viro parent, ret); 118463d49d84SDavid Howells goto not_found; 11851da177e4SLinus Torvalds } 118608e0e7c8SDavid Howells 11871da177e4SLinus Torvalds out_valid: 11889dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)dir_version; 11895dc84855SDavid Howells out_valid_noupdate: 11901da177e4SLinus Torvalds dput(parent); 119100d3b7a4SDavid Howells key_put(key); 11921da177e4SLinus Torvalds _leave(" = 1 [valid]"); 11931da177e4SLinus Torvalds return 1; 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds not_found: 1196a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 11971da177e4SLinus Torvalds dput(parent); 119800d3b7a4SDavid Howells key_put(key); 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds _leave(" = 0 [bad]"); 12011da177e4SLinus Torvalds return 0; 1202ec26815aSDavid Howells } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds /* 12051da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 12061da177e4SLinus Torvalds * sleep) 12071da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 12081da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 12091da177e4SLinus Torvalds */ 1210fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 12111da177e4SLinus Torvalds { 1212a455589fSAl Viro _enter("%pd", dentry); 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 12151da177e4SLinus Torvalds goto zap; 12161da177e4SLinus Torvalds 12172b0143b5SDavid Howells if (d_really_is_positive(dentry) && 12182b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 12192b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 12201da177e4SLinus Torvalds goto zap; 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds _leave(" = 0 [keep]"); 12231da177e4SLinus Torvalds return 0; 12241da177e4SLinus Torvalds 12251da177e4SLinus Torvalds zap: 12261da177e4SLinus Torvalds _leave(" = 1 [zap]"); 12271da177e4SLinus Torvalds return 1; 1228ec26815aSDavid Howells } 1229260a9803SDavid Howells 1230260a9803SDavid Howells /* 123179ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 123279ddbfa5SDavid Howells */ 123379ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 123479ddbfa5SDavid Howells { 123579ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 123679ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 123779ddbfa5SDavid Howells iput(inode); 123879ddbfa5SDavid Howells } 123979ddbfa5SDavid Howells 124079ddbfa5SDavid Howells /* 1241260a9803SDavid Howells * handle dentry release 1242260a9803SDavid Howells */ 124366c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1244260a9803SDavid Howells { 1245a455589fSAl Viro _enter("%pd", dentry); 1246260a9803SDavid Howells } 1247260a9803SDavid Howells 1248728279a5SDavid Howells void afs_check_for_remote_deletion(struct afs_operation *op) 1249728279a5SDavid Howells { 1250728279a5SDavid Howells struct afs_vnode *vnode = op->file[0].vnode; 1251728279a5SDavid Howells 1252728279a5SDavid Howells switch (op->ac.abort_code) { 1253728279a5SDavid Howells case VNOVNODE: 1254728279a5SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1255728279a5SDavid Howells afs_break_callback(vnode, afs_cb_break_for_deleted); 1256728279a5SDavid Howells } 1257728279a5SDavid Howells } 1258728279a5SDavid Howells 1259260a9803SDavid Howells /* 1260d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1261d2ddc776SDavid Howells */ 1262e49c7b2fSDavid Howells static void afs_vnode_new_inode(struct afs_operation *op) 1263d2ddc776SDavid Howells { 1264e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 12655a813276SDavid Howells struct afs_vnode *vnode; 1266d2ddc776SDavid Howells struct inode *inode; 1267d2ddc776SDavid Howells 1268e49c7b2fSDavid Howells _enter(""); 1269d2ddc776SDavid Howells 1270e49c7b2fSDavid Howells ASSERTCMP(op->error, ==, 0); 1271e49c7b2fSDavid Howells 1272e49c7b2fSDavid Howells inode = afs_iget(op, vp); 1273d2ddc776SDavid Howells if (IS_ERR(inode)) { 1274d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1275d2ddc776SDavid Howells * the new directory on the server. 1276d2ddc776SDavid Howells */ 1277e49c7b2fSDavid Howells op->error = PTR_ERR(inode); 1278d2ddc776SDavid Howells return; 1279d2ddc776SDavid Howells } 1280d2ddc776SDavid Howells 12815a813276SDavid Howells vnode = AFS_FS_I(inode); 12825a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1283e49c7b2fSDavid Howells if (!op->error) 1284e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); 1285e49c7b2fSDavid Howells d_instantiate(op->dentry, inode); 1286d2ddc776SDavid Howells } 1287d2ddc776SDavid Howells 1288e49c7b2fSDavid Howells static void afs_create_success(struct afs_operation *op) 1289b8359153SDavid Howells { 1290e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1291da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1292e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1293e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1294e49c7b2fSDavid Howells afs_vnode_new_inode(op); 1295b8359153SDavid Howells } 1296b8359153SDavid Howells 1297e49c7b2fSDavid Howells static void afs_create_edit_dir(struct afs_operation *op) 12989dd0b82eSDavid Howells { 1299e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1300e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1301e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1302e49c7b2fSDavid Howells 1303e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1304e49c7b2fSDavid Howells 1305e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1306e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1307e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1308e49c7b2fSDavid Howells afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, 1309e49c7b2fSDavid Howells op->create.reason); 1310e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 13119dd0b82eSDavid Howells } 13129dd0b82eSDavid Howells 1313e49c7b2fSDavid Howells static void afs_create_put(struct afs_operation *op) 1314e49c7b2fSDavid Howells { 1315e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1316e49c7b2fSDavid Howells 1317e49c7b2fSDavid Howells if (op->error) 1318e49c7b2fSDavid Howells d_drop(op->dentry); 1319e49c7b2fSDavid Howells } 1320e49c7b2fSDavid Howells 1321e49c7b2fSDavid Howells static const struct afs_operation_ops afs_mkdir_operation = { 1322e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_make_dir, 1323e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_make_dir, 1324e49c7b2fSDavid Howells .success = afs_create_success, 1325728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1326e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1327e49c7b2fSDavid Howells .put = afs_create_put, 1328e49c7b2fSDavid Howells }; 1329e49c7b2fSDavid Howells 13309dd0b82eSDavid Howells /* 1331260a9803SDavid Howells * create a directory on an AFS filesystem 1332260a9803SDavid Howells */ 1333549c7297SChristian Brauner static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1334549c7297SChristian Brauner struct dentry *dentry, umode_t mode) 1335260a9803SDavid Howells { 1336e49c7b2fSDavid Howells struct afs_operation *op; 1337d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1338260a9803SDavid Howells 13393b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1340a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1341260a9803SDavid Howells 1342e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1343e49c7b2fSDavid Howells if (IS_ERR(op)) { 1344260a9803SDavid Howells d_drop(dentry); 1345e49c7b2fSDavid Howells return PTR_ERR(op); 1346e49c7b2fSDavid Howells } 1347e49c7b2fSDavid Howells 1348e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1349e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 135022650f14SDavid Howells op->file[0].modification = true; 1351da8d0755SDavid Howells op->file[0].update_ctime = true; 1352e49c7b2fSDavid Howells op->dentry = dentry; 1353e49c7b2fSDavid Howells op->create.mode = S_IFDIR | mode; 1354e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_mkdir; 1355e49c7b2fSDavid Howells op->ops = &afs_mkdir_operation; 1356e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1357260a9803SDavid Howells } 1358260a9803SDavid Howells 1359260a9803SDavid Howells /* 1360d2ddc776SDavid Howells * Remove a subdir from a directory. 1361260a9803SDavid Howells */ 1362d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1363260a9803SDavid Howells { 13642b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1365d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1366d2ddc776SDavid Howells 1367260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1368260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1369c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 137063a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1371260a9803SDavid Howells } 1372260a9803SDavid Howells } 1373260a9803SDavid Howells 1374e49c7b2fSDavid Howells static void afs_rmdir_success(struct afs_operation *op) 1375e49c7b2fSDavid Howells { 1376e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1377da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1378e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1379e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1380e49c7b2fSDavid Howells } 1381e49c7b2fSDavid Howells 1382e49c7b2fSDavid Howells static void afs_rmdir_edit_dir(struct afs_operation *op) 1383e49c7b2fSDavid Howells { 1384e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1385e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1386e49c7b2fSDavid Howells 1387e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1388e49c7b2fSDavid Howells afs_dir_remove_subdir(op->dentry); 1389e49c7b2fSDavid Howells 1390e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1391e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1392e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1393e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1394e49c7b2fSDavid Howells afs_edit_dir_for_rmdir); 1395e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1396e49c7b2fSDavid Howells } 1397e49c7b2fSDavid Howells 1398e49c7b2fSDavid Howells static void afs_rmdir_put(struct afs_operation *op) 1399e49c7b2fSDavid Howells { 1400e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1401e49c7b2fSDavid Howells if (op->file[1].vnode) 1402e49c7b2fSDavid Howells up_write(&op->file[1].vnode->rmdir_lock); 1403e49c7b2fSDavid Howells } 1404e49c7b2fSDavid Howells 1405e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rmdir_operation = { 1406e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_dir, 1407e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_dir, 1408e49c7b2fSDavid Howells .success = afs_rmdir_success, 1409728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1410e49c7b2fSDavid Howells .edit_dir = afs_rmdir_edit_dir, 1411e49c7b2fSDavid Howells .put = afs_rmdir_put, 1412e49c7b2fSDavid Howells }; 1413e49c7b2fSDavid Howells 1414260a9803SDavid Howells /* 1415d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1416260a9803SDavid Howells */ 1417d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1418260a9803SDavid Howells { 1419e49c7b2fSDavid Howells struct afs_operation *op; 1420f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1421260a9803SDavid Howells int ret; 1422260a9803SDavid Howells 14233b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1424a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1425260a9803SDavid Howells 1426e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1427e49c7b2fSDavid Howells if (IS_ERR(op)) 1428e49c7b2fSDavid Howells return PTR_ERR(op); 1429a58823acSDavid Howells 1430e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1431e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 143222650f14SDavid Howells op->file[0].modification = true; 1433da8d0755SDavid Howells op->file[0].update_ctime = true; 1434e49c7b2fSDavid Howells 1435e49c7b2fSDavid Howells op->dentry = dentry; 1436e49c7b2fSDavid Howells op->ops = &afs_rmdir_operation; 1437260a9803SDavid Howells 1438f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1439f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1440f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1441e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1442f58db83fSDavid Howells if (ret < 0) 1443e49c7b2fSDavid Howells goto error; 1444f58db83fSDavid Howells } 1445f58db83fSDavid Howells 144679ddbfa5SDavid Howells if (vnode) { 144779ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 144879ddbfa5SDavid Howells if (ret < 0) 1449e49c7b2fSDavid Howells goto error; 1450e49c7b2fSDavid Howells op->file[1].vnode = vnode; 145179ddbfa5SDavid Howells } 145279ddbfa5SDavid Howells 1453e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1454a58823acSDavid Howells 1455d2ddc776SDavid Howells error: 1456e49c7b2fSDavid Howells return afs_put_operation(op); 1457d2ddc776SDavid Howells } 1458260a9803SDavid Howells 1459d2ddc776SDavid Howells /* 1460d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1461d2ddc776SDavid Howells * 1462d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1463d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1464d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1465d2ddc776SDavid Howells * 1466d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1467d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1468d2ddc776SDavid Howells */ 1469e49c7b2fSDavid Howells static void afs_dir_remove_link(struct afs_operation *op) 1470d2ddc776SDavid Howells { 1471e49c7b2fSDavid Howells struct afs_vnode *dvnode = op->file[0].vnode; 1472e49c7b2fSDavid Howells struct afs_vnode *vnode = op->file[1].vnode; 1473e49c7b2fSDavid Howells struct dentry *dentry = op->dentry; 1474e49c7b2fSDavid Howells int ret; 1475d2ddc776SDavid Howells 1476e49c7b2fSDavid Howells if (op->error != 0 || 1477e49c7b2fSDavid Howells (op->file[1].scb.have_status && op->file[1].scb.have_error)) 1478e49c7b2fSDavid Howells return; 1479e49c7b2fSDavid Howells if (d_really_is_positive(dentry)) 1480e49c7b2fSDavid Howells return; 1481d2ddc776SDavid Howells 148230062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 148330062bd1SDavid Howells /* Already done */ 1484a38a7558SDavid Howells } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1485a38a7558SDavid Howells write_seqlock(&vnode->cb_lock); 1486440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1487440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1488440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1489051d2525SDavid Howells __afs_break_callback(vnode, afs_cb_break_for_unlink); 1490440fbc3aSDavid Howells } 1491a38a7558SDavid Howells write_sequnlock(&vnode->cb_lock); 1492440fbc3aSDavid Howells } else { 1493051d2525SDavid Howells afs_break_callback(vnode, afs_cb_break_for_unlink); 1494440fbc3aSDavid Howells 1495d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1496e49c7b2fSDavid Howells _debug("AFS_VNODE_DELETED"); 1497d2ddc776SDavid Howells 1498e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1499e49c7b2fSDavid Howells if (ret != -ESTALE) 1500e49c7b2fSDavid Howells op->error = ret; 1501d2ddc776SDavid Howells } 1502d2ddc776SDavid Howells 1503e49c7b2fSDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error); 1504d2ddc776SDavid Howells } 1505d2ddc776SDavid Howells 1506e49c7b2fSDavid Howells static void afs_unlink_success(struct afs_operation *op) 1507e49c7b2fSDavid Howells { 1508e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1509da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1510b6489a49SDavid Howells afs_check_dir_conflict(op, &op->file[0]); 1511e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1512e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1513e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1514e49c7b2fSDavid Howells afs_dir_remove_link(op); 1515e49c7b2fSDavid Howells } 1516e49c7b2fSDavid Howells 1517e49c7b2fSDavid Howells static void afs_unlink_edit_dir(struct afs_operation *op) 1518e49c7b2fSDavid Howells { 1519e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1520e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1521e49c7b2fSDavid Howells 1522e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1523e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1524e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1525e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1526e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1527e49c7b2fSDavid Howells afs_edit_dir_for_unlink); 1528e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1529e49c7b2fSDavid Howells } 1530e49c7b2fSDavid Howells 1531e49c7b2fSDavid Howells static void afs_unlink_put(struct afs_operation *op) 1532e49c7b2fSDavid Howells { 1533e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1534e49c7b2fSDavid Howells if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) 1535e49c7b2fSDavid Howells d_rehash(op->dentry); 1536e49c7b2fSDavid Howells } 1537e49c7b2fSDavid Howells 1538e49c7b2fSDavid Howells static const struct afs_operation_ops afs_unlink_operation = { 1539e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_file, 1540e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_file, 1541e49c7b2fSDavid Howells .success = afs_unlink_success, 1542728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1543e49c7b2fSDavid Howells .edit_dir = afs_unlink_edit_dir, 1544e49c7b2fSDavid Howells .put = afs_unlink_put, 1545e49c7b2fSDavid Howells }; 1546e49c7b2fSDavid Howells 1547d2ddc776SDavid Howells /* 1548d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1549d2ddc776SDavid Howells */ 1550d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1551d2ddc776SDavid Howells { 1552e49c7b2fSDavid Howells struct afs_operation *op; 1553fa59f52fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1554fa59f52fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1555d2ddc776SDavid Howells int ret; 1556d2ddc776SDavid Howells 15573b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1558d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1559d2ddc776SDavid Howells 1560d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1561d2ddc776SDavid Howells return -ENAMETOOLONG; 1562d2ddc776SDavid Howells 1563e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1564e49c7b2fSDavid Howells if (IS_ERR(op)) 1565e49c7b2fSDavid Howells return PTR_ERR(op); 1566a58823acSDavid Howells 1567e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1568e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 156922650f14SDavid Howells op->file[0].modification = true; 1570da8d0755SDavid Howells op->file[0].update_ctime = true; 1571d2ddc776SDavid Howells 1572d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1573e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1574e49c7b2fSDavid Howells if (ret < 0) { 1575e49c7b2fSDavid Howells op->error = ret; 1576e49c7b2fSDavid Howells goto error; 1577e49c7b2fSDavid Howells } 1578d2ddc776SDavid Howells 157979ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 1580fa59f52fSDavid Howells if (d_count(dentry) > 1) { 158179ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 158279ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 158379ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 1584e49c7b2fSDavid Howells op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); 1585e49c7b2fSDavid Howells goto error; 158679ddbfa5SDavid Howells } 158779ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 158879ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 158979ddbfa5SDavid Howells __d_drop(dentry); 1590e49c7b2fSDavid Howells op->unlink.need_rehash = true; 159179ddbfa5SDavid Howells } 159279ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 159379ddbfa5SDavid Howells 1594e49c7b2fSDavid Howells op->file[1].vnode = vnode; 1595da8d0755SDavid Howells op->file[1].update_ctime = true; 1596b6489a49SDavid Howells op->file[1].op_unlinked = true; 1597e49c7b2fSDavid Howells op->dentry = dentry; 1598e49c7b2fSDavid Howells op->ops = &afs_unlink_operation; 1599b6489a49SDavid Howells afs_begin_vnode_operation(op); 1600b6489a49SDavid Howells afs_wait_for_operation(op); 1601b6489a49SDavid Howells 1602b6489a49SDavid Howells /* If there was a conflict with a third party, check the status of the 1603b6489a49SDavid Howells * unlinked vnode. 1604b6489a49SDavid Howells */ 1605b6489a49SDavid Howells if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) { 1606b6489a49SDavid Howells op->file[1].update_ctime = false; 1607b6489a49SDavid Howells op->fetch_status.which = 1; 1608b6489a49SDavid Howells op->ops = &afs_fetch_status_operation; 1609b6489a49SDavid Howells afs_begin_vnode_operation(op); 1610b6489a49SDavid Howells afs_wait_for_operation(op); 1611b6489a49SDavid Howells } 1612b6489a49SDavid Howells 1613b6489a49SDavid Howells return afs_put_operation(op); 1614a58823acSDavid Howells 1615260a9803SDavid Howells error: 1616e49c7b2fSDavid Howells return afs_put_operation(op); 1617260a9803SDavid Howells } 1618260a9803SDavid Howells 1619e49c7b2fSDavid Howells static const struct afs_operation_ops afs_create_operation = { 1620e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_create_file, 1621e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_create_file, 1622e49c7b2fSDavid Howells .success = afs_create_success, 1623728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1624e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1625e49c7b2fSDavid Howells .put = afs_create_put, 1626e49c7b2fSDavid Howells }; 1627e49c7b2fSDavid Howells 1628260a9803SDavid Howells /* 1629260a9803SDavid Howells * create a regular file on an AFS filesystem 1630260a9803SDavid Howells */ 1631549c7297SChristian Brauner static int afs_create(struct user_namespace *mnt_userns, struct inode *dir, 1632549c7297SChristian Brauner struct dentry *dentry, umode_t mode, bool excl) 1633260a9803SDavid Howells { 1634e49c7b2fSDavid Howells struct afs_operation *op; 163543dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1636e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1637260a9803SDavid Howells 1638e49c7b2fSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1639a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1640260a9803SDavid Howells 1641d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1642d2ddc776SDavid Howells goto error; 1643d2ddc776SDavid Howells 1644e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1645e49c7b2fSDavid Howells if (IS_ERR(op)) { 1646e49c7b2fSDavid Howells ret = PTR_ERR(op); 1647260a9803SDavid Howells goto error; 1648260a9803SDavid Howells } 1649260a9803SDavid Howells 1650e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1651e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 165222650f14SDavid Howells op->file[0].modification = true; 1653da8d0755SDavid Howells op->file[0].update_ctime = true; 1654a58823acSDavid Howells 1655e49c7b2fSDavid Howells op->dentry = dentry; 1656e49c7b2fSDavid Howells op->create.mode = S_IFREG | mode; 1657e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_create; 1658e49c7b2fSDavid Howells op->ops = &afs_create_operation; 1659e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1660a58823acSDavid Howells 1661260a9803SDavid Howells error: 1662260a9803SDavid Howells d_drop(dentry); 1663260a9803SDavid Howells _leave(" = %d", ret); 1664260a9803SDavid Howells return ret; 1665260a9803SDavid Howells } 1666260a9803SDavid Howells 1667e49c7b2fSDavid Howells static void afs_link_success(struct afs_operation *op) 1668e49c7b2fSDavid Howells { 1669e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1670e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1671e49c7b2fSDavid Howells 1672e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1673da8d0755SDavid Howells op->ctime = dvp->scb.status.mtime_client; 1674e49c7b2fSDavid Howells afs_vnode_commit_status(op, dvp); 1675e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 1676e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry); 1677e49c7b2fSDavid Howells if (op->dentry_2->d_parent == op->dentry->d_parent) 1678e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry_2); 1679e49c7b2fSDavid Howells ihold(&vp->vnode->vfs_inode); 1680e49c7b2fSDavid Howells d_instantiate(op->dentry, &vp->vnode->vfs_inode); 1681e49c7b2fSDavid Howells } 1682e49c7b2fSDavid Howells 1683e49c7b2fSDavid Howells static void afs_link_put(struct afs_operation *op) 1684e49c7b2fSDavid Howells { 1685e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1686e49c7b2fSDavid Howells if (op->error) 1687e49c7b2fSDavid Howells d_drop(op->dentry); 1688e49c7b2fSDavid Howells } 1689e49c7b2fSDavid Howells 1690e49c7b2fSDavid Howells static const struct afs_operation_ops afs_link_operation = { 1691e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_link, 1692e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_link, 1693e49c7b2fSDavid Howells .success = afs_link_success, 1694728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1695e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1696e49c7b2fSDavid Howells .put = afs_link_put, 1697e49c7b2fSDavid Howells }; 1698e49c7b2fSDavid Howells 1699260a9803SDavid Howells /* 1700260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1701260a9803SDavid Howells */ 1702260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1703260a9803SDavid Howells struct dentry *dentry) 1704260a9803SDavid Howells { 1705e49c7b2fSDavid Howells struct afs_operation *op; 1706a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1707a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1708e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1709260a9803SDavid Howells 17103b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1711260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1712260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1713a455589fSAl Viro dentry); 1714260a9803SDavid Howells 1715d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1716d2ddc776SDavid Howells goto error; 1717d2ddc776SDavid Howells 1718e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1719e49c7b2fSDavid Howells if (IS_ERR(op)) { 1720e49c7b2fSDavid Howells ret = PTR_ERR(op); 1721a58823acSDavid Howells goto error; 1722260a9803SDavid Howells } 1723260a9803SDavid Howells 17243978d816SDavid Howells ret = afs_validate(vnode, op->key); 17253978d816SDavid Howells if (ret < 0) 17263978d816SDavid Howells goto error_op; 17273978d816SDavid Howells 1728e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1729e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, vnode); 1730e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 173122650f14SDavid Howells op->file[0].modification = true; 1732da8d0755SDavid Howells op->file[0].update_ctime = true; 1733da8d0755SDavid Howells op->file[1].update_ctime = true; 1734a58823acSDavid Howells 1735e49c7b2fSDavid Howells op->dentry = dentry; 1736e49c7b2fSDavid Howells op->dentry_2 = from; 1737e49c7b2fSDavid Howells op->ops = &afs_link_operation; 1738e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_link; 1739e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1740260a9803SDavid Howells 17413978d816SDavid Howells error_op: 17423978d816SDavid Howells afs_put_operation(op); 1743260a9803SDavid Howells error: 1744260a9803SDavid Howells d_drop(dentry); 1745260a9803SDavid Howells _leave(" = %d", ret); 1746260a9803SDavid Howells return ret; 1747260a9803SDavid Howells } 1748260a9803SDavid Howells 1749e49c7b2fSDavid Howells static const struct afs_operation_ops afs_symlink_operation = { 1750e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_symlink, 1751e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_symlink, 1752e49c7b2fSDavid Howells .success = afs_create_success, 1753728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1754e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1755e49c7b2fSDavid Howells .put = afs_create_put, 1756e49c7b2fSDavid Howells }; 1757e49c7b2fSDavid Howells 1758260a9803SDavid Howells /* 1759260a9803SDavid Howells * create a symlink in an AFS filesystem 1760260a9803SDavid Howells */ 1761549c7297SChristian Brauner static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1762549c7297SChristian Brauner struct dentry *dentry, const char *content) 1763260a9803SDavid Howells { 1764e49c7b2fSDavid Howells struct afs_operation *op; 1765d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1766260a9803SDavid Howells int ret; 1767260a9803SDavid Howells 17683b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1769a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1770260a9803SDavid Howells content); 1771260a9803SDavid Howells 1772d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1773d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1774d2ddc776SDavid Howells goto error; 1775d2ddc776SDavid Howells 1776260a9803SDavid Howells ret = -EINVAL; 177745222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1778260a9803SDavid Howells goto error; 1779260a9803SDavid Howells 1780e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1781e49c7b2fSDavid Howells if (IS_ERR(op)) { 1782e49c7b2fSDavid Howells ret = PTR_ERR(op); 1783a58823acSDavid Howells goto error; 1784260a9803SDavid Howells } 1785260a9803SDavid Howells 1786e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1787e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1788a58823acSDavid Howells 1789e49c7b2fSDavid Howells op->dentry = dentry; 1790e49c7b2fSDavid Howells op->ops = &afs_symlink_operation; 1791e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_symlink; 1792e49c7b2fSDavid Howells op->create.symlink = content; 1793e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1794d2ddc776SDavid Howells 1795260a9803SDavid Howells error: 1796260a9803SDavid Howells d_drop(dentry); 1797260a9803SDavid Howells _leave(" = %d", ret); 1798260a9803SDavid Howells return ret; 1799260a9803SDavid Howells } 1800260a9803SDavid Howells 1801e49c7b2fSDavid Howells static void afs_rename_success(struct afs_operation *op) 1802260a9803SDavid Howells { 1803e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1804e49c7b2fSDavid Howells 1805da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1806b6489a49SDavid Howells afs_check_dir_conflict(op, &op->file[1]); 1807e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1808da8d0755SDavid Howells if (op->file[1].vnode != op->file[0].vnode) { 1809da8d0755SDavid Howells op->ctime = op->file[1].scb.status.mtime_client; 1810e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1811e49c7b2fSDavid Howells } 1812da8d0755SDavid Howells } 1813e49c7b2fSDavid Howells 1814e49c7b2fSDavid Howells static void afs_rename_edit_dir(struct afs_operation *op) 1815e49c7b2fSDavid Howells { 1816e49c7b2fSDavid Howells struct afs_vnode_param *orig_dvp = &op->file[0]; 1817e49c7b2fSDavid Howells struct afs_vnode_param *new_dvp = &op->file[1]; 1818e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode = orig_dvp->vnode; 1819e49c7b2fSDavid Howells struct afs_vnode *new_dvnode = new_dvp->vnode; 1820e49c7b2fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); 1821e49c7b2fSDavid Howells struct dentry *old_dentry = op->dentry; 1822e49c7b2fSDavid Howells struct dentry *new_dentry = op->dentry_2; 182379ddbfa5SDavid Howells struct inode *new_inode; 1824260a9803SDavid Howells 1825e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 18261cd66c93SMiklos Szeredi 1827e49c7b2fSDavid Howells if (op->rename.rehash) { 1828e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1829e49c7b2fSDavid Howells op->rename.rehash = NULL; 1830260a9803SDavid Howells } 1831260a9803SDavid Howells 18322105c282SDavid Howells down_write(&orig_dvnode->validate_lock); 18332105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && 1834e49c7b2fSDavid Howells orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) 183563a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 183679ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 183763a4681fSDavid Howells 1838e49c7b2fSDavid Howells if (new_dvnode != orig_dvnode) { 1839e49c7b2fSDavid Howells up_write(&orig_dvnode->validate_lock); 18402105c282SDavid Howells down_write(&new_dvnode->validate_lock); 18412105c282SDavid Howells } 1842e49c7b2fSDavid Howells 18432105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && 1844e49c7b2fSDavid Howells new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { 1845e49c7b2fSDavid Howells if (!op->rename.new_negative) 184663a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 184779ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 184863a4681fSDavid Howells 184963a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 185079ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 18512105c282SDavid Howells } 185279ddbfa5SDavid Howells 185379ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 185479ddbfa5SDavid Howells if (new_inode) { 185579ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 1856f610a5a2SDavid Howells if (S_ISDIR(new_inode->i_mode)) 1857f610a5a2SDavid Howells clear_nlink(new_inode); 1858f610a5a2SDavid Howells else if (new_inode->i_nlink > 0) 185979ddbfa5SDavid Howells drop_nlink(new_inode); 186079ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 186179ddbfa5SDavid Howells } 18629dd0b82eSDavid Howells 18639dd0b82eSDavid Howells /* Now we can update d_fsdata on the dentries to reflect their 18649dd0b82eSDavid Howells * new parent's data_version. 18659dd0b82eSDavid Howells * 18669dd0b82eSDavid Howells * Note that if we ever implement RENAME_EXCHANGE, we'll have 18679dd0b82eSDavid Howells * to update both dentries with opposing dir versions. 18689dd0b82eSDavid Howells */ 1869e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry); 1870e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry_2); 1871e49c7b2fSDavid Howells 187279ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 1873e49c7b2fSDavid Howells 18742105c282SDavid Howells up_write(&new_dvnode->validate_lock); 187563a4681fSDavid Howells } 187663a4681fSDavid Howells 1877e49c7b2fSDavid Howells static void afs_rename_put(struct afs_operation *op) 1878e49c7b2fSDavid Howells { 1879e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1880e49c7b2fSDavid Howells if (op->rename.rehash) 1881e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1882e49c7b2fSDavid Howells dput(op->rename.tmp); 1883e49c7b2fSDavid Howells if (op->error) 1884e49c7b2fSDavid Howells d_rehash(op->dentry); 1885e49c7b2fSDavid Howells } 1886e49c7b2fSDavid Howells 1887e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rename_operation = { 1888e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_rename, 1889e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_rename, 1890e49c7b2fSDavid Howells .success = afs_rename_success, 1891e49c7b2fSDavid Howells .edit_dir = afs_rename_edit_dir, 1892e49c7b2fSDavid Howells .put = afs_rename_put, 1893e49c7b2fSDavid Howells }; 1894e49c7b2fSDavid Howells 1895e49c7b2fSDavid Howells /* 1896e49c7b2fSDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1897e49c7b2fSDavid Howells */ 1898549c7297SChristian Brauner static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1899549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir, 1900549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags) 1901e49c7b2fSDavid Howells { 1902e49c7b2fSDavid Howells struct afs_operation *op; 1903e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1904e49c7b2fSDavid Howells int ret; 1905e49c7b2fSDavid Howells 1906e49c7b2fSDavid Howells if (flags) 1907e49c7b2fSDavid Howells return -EINVAL; 1908e49c7b2fSDavid Howells 1909e49c7b2fSDavid Howells /* Don't allow silly-rename files be moved around. */ 1910e49c7b2fSDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 1911e49c7b2fSDavid Howells return -EINVAL; 1912e49c7b2fSDavid Howells 1913e49c7b2fSDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1914e49c7b2fSDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1915e49c7b2fSDavid Howells new_dvnode = AFS_FS_I(new_dir); 1916e49c7b2fSDavid Howells 1917e49c7b2fSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1918e49c7b2fSDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1919e49c7b2fSDavid Howells vnode->fid.vid, vnode->fid.vnode, 1920e49c7b2fSDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1921e49c7b2fSDavid Howells new_dentry); 1922e49c7b2fSDavid Howells 1923e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, orig_dvnode->volume); 1924e49c7b2fSDavid Howells if (IS_ERR(op)) 1925e49c7b2fSDavid Howells return PTR_ERR(op); 1926e49c7b2fSDavid Howells 19273978d816SDavid Howells ret = afs_validate(vnode, op->key); 19283978d816SDavid Howells op->error = ret; 19293978d816SDavid Howells if (ret < 0) 19303978d816SDavid Howells goto error; 19313978d816SDavid Howells 1932e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, orig_dvnode); 1933e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ 1934e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1935e49c7b2fSDavid Howells op->file[1].dv_delta = 1; 193622650f14SDavid Howells op->file[0].modification = true; 193722650f14SDavid Howells op->file[1].modification = true; 1938da8d0755SDavid Howells op->file[0].update_ctime = true; 1939da8d0755SDavid Howells op->file[1].update_ctime = true; 1940e49c7b2fSDavid Howells 1941e49c7b2fSDavid Howells op->dentry = old_dentry; 1942e49c7b2fSDavid Howells op->dentry_2 = new_dentry; 1943e49c7b2fSDavid Howells op->rename.new_negative = d_is_negative(new_dentry); 1944e49c7b2fSDavid Howells op->ops = &afs_rename_operation; 1945e49c7b2fSDavid Howells 1946e49c7b2fSDavid Howells /* For non-directories, check whether the target is busy and if so, 1947e49c7b2fSDavid Howells * make a copy of the dentry and then do a silly-rename. If the 1948e49c7b2fSDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 1949e49c7b2fSDavid Howells * new target. 1950e49c7b2fSDavid Howells */ 1951e49c7b2fSDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 1952e49c7b2fSDavid Howells /* To prevent any new references to the target during the 1953e49c7b2fSDavid Howells * rename, we unhash the dentry in advance. 1954e49c7b2fSDavid Howells */ 1955e49c7b2fSDavid Howells if (!d_unhashed(new_dentry)) { 1956e49c7b2fSDavid Howells d_drop(new_dentry); 1957e49c7b2fSDavid Howells op->rename.rehash = new_dentry; 1958e49c7b2fSDavid Howells } 1959e49c7b2fSDavid Howells 1960e49c7b2fSDavid Howells if (d_count(new_dentry) > 2) { 1961e49c7b2fSDavid Howells /* copy the target dentry's name */ 1962e49c7b2fSDavid Howells op->rename.tmp = d_alloc(new_dentry->d_parent, 1963e49c7b2fSDavid Howells &new_dentry->d_name); 1964b4280812SJiapeng Chong if (!op->rename.tmp) { 1965b4280812SJiapeng Chong op->error = -ENOMEM; 1966e49c7b2fSDavid Howells goto error; 1967b4280812SJiapeng Chong } 1968e49c7b2fSDavid Howells 1969e49c7b2fSDavid Howells ret = afs_sillyrename(new_dvnode, 1970e49c7b2fSDavid Howells AFS_FS_I(d_inode(new_dentry)), 1971e49c7b2fSDavid Howells new_dentry, op->key); 1972b4280812SJiapeng Chong if (ret) { 1973b4280812SJiapeng Chong op->error = ret; 1974e49c7b2fSDavid Howells goto error; 1975b4280812SJiapeng Chong } 1976e49c7b2fSDavid Howells 1977e49c7b2fSDavid Howells op->dentry_2 = op->rename.tmp; 1978e49c7b2fSDavid Howells op->rename.rehash = NULL; 1979e49c7b2fSDavid Howells op->rename.new_negative = true; 1980e49c7b2fSDavid Howells } 1981e49c7b2fSDavid Howells } 1982e49c7b2fSDavid Howells 1983e49c7b2fSDavid Howells /* This bit is potentially nasty as there's a potential race with 1984e49c7b2fSDavid Howells * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 1985e49c7b2fSDavid Howells * to reflect it's new parent's new data_version after the op, but 1986e49c7b2fSDavid Howells * d_revalidate may see old_dentry between the op having taken place 1987e49c7b2fSDavid Howells * and the version being updated. 1988e49c7b2fSDavid Howells * 1989e49c7b2fSDavid Howells * So drop the old_dentry for now to make other threads go through 1990e49c7b2fSDavid Howells * lookup instead - which we hold a lock against. 1991e49c7b2fSDavid Howells */ 1992e49c7b2fSDavid Howells d_drop(old_dentry); 1993e49c7b2fSDavid Howells 1994e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1995e49c7b2fSDavid Howells 1996260a9803SDavid Howells error: 1997e49c7b2fSDavid Howells return afs_put_operation(op); 1998260a9803SDavid Howells } 1999f3ddee8dSDavid Howells 2000f3ddee8dSDavid Howells /* 2001255ed636SDavid Howells * Release a directory folio and clean up its private state if it's not busy 2002255ed636SDavid Howells * - return true if the folio can now be released, false if not 2003f3ddee8dSDavid Howells */ 2004255ed636SDavid Howells static int afs_dir_releasepage(struct page *subpage, gfp_t gfp_flags) 2005f3ddee8dSDavid Howells { 2006255ed636SDavid Howells struct folio *folio = page_folio(subpage); 2007255ed636SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); 2008f3ddee8dSDavid Howells 2009255ed636SDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio)); 2010f3ddee8dSDavid Howells 2011255ed636SDavid Howells folio_detach_private(folio); 2012f3ddee8dSDavid Howells 2013f3ddee8dSDavid Howells /* The directory will need reloading. */ 2014f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2015f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 2016255ed636SDavid Howells return true; 2017f3ddee8dSDavid Howells } 2018f3ddee8dSDavid Howells 2019f3ddee8dSDavid Howells /* 2020255ed636SDavid Howells * Invalidate part or all of a folio. 2021f3ddee8dSDavid Howells */ 2022*f6bc6fb8SMatthew Wilcox (Oracle) static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, 2023*f6bc6fb8SMatthew Wilcox (Oracle) size_t length) 2024f3ddee8dSDavid Howells { 2025255ed636SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); 2026f3ddee8dSDavid Howells 2027*f6bc6fb8SMatthew Wilcox (Oracle) _enter("{%lu},%zu,%zu", folio->index, offset, length); 2028f3ddee8dSDavid Howells 2029255ed636SDavid Howells BUG_ON(!folio_test_locked(folio)); 2030f3ddee8dSDavid Howells 2031f3ddee8dSDavid Howells /* The directory will need reloading. */ 2032f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2033f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 2034f3ddee8dSDavid Howells 2035255ed636SDavid Howells /* we clean up only if the entire folio is being invalidated */ 2036255ed636SDavid Howells if (offset == 0 && length == folio_size(folio)) 2037255ed636SDavid Howells folio_detach_private(folio); 2038f3ddee8dSDavid Howells } 2039