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); 314acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 32ebfc3b49SAl Viro bool excl); 3318bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 34260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 37260a9803SDavid Howells struct dentry *dentry); 38260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 39260a9803SDavid Howells const char *content); 40260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 411cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 421cd66c93SMiklos Szeredi unsigned int flags); 43f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 44f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 45f3ddee8dSDavid Howells unsigned int length); 46f3ddee8dSDavid Howells 47f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 48f3ddee8dSDavid Howells { 49f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 50f3ddee8dSDavid Howells } 511da177e4SLinus Torvalds 524b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 531da177e4SLinus Torvalds .open = afs_dir_open, 5400d3b7a4SDavid Howells .release = afs_release, 5529884effSAl Viro .iterate_shared = afs_readdir, 56e8d6c554SDavid Howells .lock = afs_lock, 573222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 581da177e4SLinus Torvalds }; 591da177e4SLinus Torvalds 60754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 61260a9803SDavid Howells .create = afs_create, 62260a9803SDavid Howells .lookup = afs_lookup, 63260a9803SDavid Howells .link = afs_link, 64260a9803SDavid Howells .unlink = afs_unlink, 65260a9803SDavid Howells .symlink = afs_symlink, 66260a9803SDavid Howells .mkdir = afs_mkdir, 67260a9803SDavid Howells .rmdir = afs_rmdir, 682773bf00SMiklos Szeredi .rename = afs_rename, 6900d3b7a4SDavid Howells .permission = afs_permission, 70416351f2SDavid Howells .getattr = afs_getattr, 7131143d5dSDavid Howells .setattr = afs_setattr, 72d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 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, 78f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 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; 10239db9815SDavid Howells struct inode **inodes; 10387182759SDavid Howells struct afs_status_cb *statuses; 1045cf9dd55SDavid Howells struct afs_fid fids[50]; 1051da177e4SLinus Torvalds }; 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /* 1081da177e4SLinus Torvalds * check that a directory page is valid 1091da177e4SLinus Torvalds */ 110f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 111f3ddee8dSDavid Howells loff_t i_size) 1121da177e4SLinus Torvalds { 11300317636SDavid Howells struct afs_xdr_dir_page *dbuf; 114f3ddee8dSDavid Howells loff_t latter, off; 1151da177e4SLinus Torvalds int tmp, qty; 1161da177e4SLinus Torvalds 117dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 118dab17c1aSDavid Howells * we must take care because the directory may change size under us. 119dab17c1aSDavid Howells */ 120dab17c1aSDavid Howells off = page_offset(page); 121dab17c1aSDavid Howells if (i_size <= off) 122dab17c1aSDavid Howells goto checked; 123dab17c1aSDavid Howells 124dab17c1aSDavid Howells latter = i_size - off; 1251da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1261da177e4SLinus Torvalds qty = PAGE_SIZE; 1271da177e4SLinus Torvalds else 1281da177e4SLinus Torvalds qty = latter; 12900317636SDavid Howells qty /= sizeof(union afs_xdr_dir_block); 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds /* check them */ 13263a4681fSDavid Howells dbuf = kmap(page); 1331da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 13400317636SDavid Howells if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 135dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 136f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 13700317636SDavid Howells ntohs(dbuf->blocks[tmp].hdr.magic)); 138f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 13963a4681fSDavid Howells kunmap(page); 140f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1411da177e4SLinus Torvalds goto error; 1421da177e4SLinus Torvalds } 14363a4681fSDavid Howells 14463a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 14563a4681fSDavid Howells * use string functions on it. The filenames in the page 14663a4681fSDavid Howells * *should* be NUL-terminated anyway. 14763a4681fSDavid Howells */ 14863a4681fSDavid Howells ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 15163a4681fSDavid Howells kunmap(page); 15263a4681fSDavid Howells 153dab17c1aSDavid Howells checked: 154f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 155be5b82dbSAl Viro return true; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds error: 158be5b82dbSAl Viro return false; 159ec26815aSDavid Howells } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* 162445b1028SDavid Howells * Check the contents of a directory that we've just read. 163445b1028SDavid Howells */ 164445b1028SDavid Howells static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) 165445b1028SDavid Howells { 166445b1028SDavid Howells struct afs_xdr_dir_page *dbuf; 167445b1028SDavid Howells unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); 168445b1028SDavid Howells 169445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) 170445b1028SDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) 171445b1028SDavid Howells goto bad; 172445b1028SDavid Howells return true; 173445b1028SDavid Howells 174445b1028SDavid Howells bad: 175445b1028SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", 176445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 177445b1028SDavid Howells req->file_size, req->len, req->actual_len, req->remain); 178445b1028SDavid Howells pr_warn("DIR %llx %x %x %x\n", 179445b1028SDavid Howells req->pos, req->index, req->nr_pages, req->offset); 180445b1028SDavid Howells 181445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) { 182445b1028SDavid Howells dbuf = kmap(req->pages[i]); 183445b1028SDavid Howells for (j = 0; j < qty; j++) { 184445b1028SDavid Howells union afs_xdr_dir_block *block = &dbuf->blocks[j]; 185445b1028SDavid Howells 186445b1028SDavid Howells pr_warn("[%02x] %32phN\n", i * qty + j, block); 187445b1028SDavid Howells } 188445b1028SDavid Howells kunmap(req->pages[i]); 189445b1028SDavid Howells } 190445b1028SDavid Howells return false; 191445b1028SDavid Howells } 192445b1028SDavid Howells 193445b1028SDavid Howells /* 1941da177e4SLinus Torvalds * open an AFS directory file 1951da177e4SLinus Torvalds */ 1961da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 1991da177e4SLinus Torvalds 20000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 20100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2021da177e4SLinus Torvalds 20308e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2041da177e4SLinus Torvalds return -ENOENT; 2051da177e4SLinus Torvalds 20600d3b7a4SDavid Howells return afs_open(inode, file); 207ec26815aSDavid Howells } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds /* 210f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 211f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 212f3ddee8dSDavid Howells * get reclaimed during the iteration. 213f3ddee8dSDavid Howells */ 214f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 215b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 216f3ddee8dSDavid Howells { 217f3ddee8dSDavid Howells struct afs_read *req; 218f3ddee8dSDavid Howells loff_t i_size; 219f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 220f3ddee8dSDavid Howells int ret = -ENOMEM; 221f3ddee8dSDavid Howells 222f3ddee8dSDavid Howells retry: 223f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 224f3ddee8dSDavid Howells if (i_size < 2048) 225f51375cdSDavid Howells return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); 226f51375cdSDavid Howells if (i_size > 2048 * 1024) { 227f51375cdSDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 228f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 229f51375cdSDavid Howells } 230f3ddee8dSDavid Howells 231f3ddee8dSDavid Howells _enter("%llu", i_size); 232f3ddee8dSDavid Howells 233f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 234f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 235f3ddee8dSDavid Howells */ 236f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 237f3ddee8dSDavid Howells nr_inline = nr_pages; 238f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 239f3ddee8dSDavid Howells nr_inline = 0; 240f3ddee8dSDavid Howells 241ee102584SZhengyuan Liu req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL); 242f3ddee8dSDavid Howells if (!req) 243f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 244f3ddee8dSDavid Howells 245f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 246f3ddee8dSDavid Howells req->nr_pages = nr_pages; 247f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 248f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 249f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 250f3ddee8dSDavid Howells if (nr_inline > 0) { 251f3ddee8dSDavid Howells req->pages = req->array; 252f3ddee8dSDavid Howells } else { 253f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 254f3ddee8dSDavid Howells GFP_KERNEL); 255f3ddee8dSDavid Howells if (!req->pages) 256f3ddee8dSDavid Howells goto error; 257f3ddee8dSDavid Howells } 258f3ddee8dSDavid Howells 259f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 260f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 261f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 262f3ddee8dSDavid Howells * need to reread the entire directory contents. 263f3ddee8dSDavid Howells */ 264f3ddee8dSDavid Howells i = 0; 265f3ddee8dSDavid Howells do { 266f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 267f3ddee8dSDavid Howells req->nr_pages - i, 268f3ddee8dSDavid Howells req->pages + i); 269f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 270f3ddee8dSDavid Howells if (n == 0) { 271f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 272f3ddee8dSDavid Howells 273f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 274f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 275f3ddee8dSDavid Howells 276f3ddee8dSDavid Howells ret = -ENOMEM; 277f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 278f3ddee8dSDavid Howells if (!req->pages[i]) 279f3ddee8dSDavid Howells goto error; 280f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 281f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 282f3ddee8dSDavid Howells i, gfp); 283f3ddee8dSDavid Howells if (ret < 0) 284f3ddee8dSDavid Howells goto error; 285f3ddee8dSDavid Howells 286f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 287f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 288f3ddee8dSDavid Howells unlock_page(req->pages[i]); 289f3ddee8dSDavid Howells i++; 290f3ddee8dSDavid Howells } else { 291f3ddee8dSDavid Howells i += n; 292f3ddee8dSDavid Howells } 293f3ddee8dSDavid Howells } while (i < req->nr_pages); 294f3ddee8dSDavid Howells 295f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 296f3ddee8dSDavid Howells * races. 297f3ddee8dSDavid Howells */ 298f3ddee8dSDavid Howells ret = -ERESTARTSYS; 299b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 300b61f7dcfSDavid Howells goto error; 301f3ddee8dSDavid Howells 302f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 303f3ddee8dSDavid Howells goto success; 304f3ddee8dSDavid Howells 305b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 306b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 307b61f7dcfSDavid Howells goto error; 308b61f7dcfSDavid Howells 309b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 31099987c56SDavid Howells trace_afs_reload_dir(dvnode); 311f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 312f3ddee8dSDavid Howells if (ret < 0) 313b61f7dcfSDavid Howells goto error_unlock; 314f3ddee8dSDavid Howells 315f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 316f3ddee8dSDavid Howells 317f3ddee8dSDavid Howells if (req->len < req->file_size) 318f3ddee8dSDavid Howells goto content_has_grown; 319f3ddee8dSDavid Howells 320f3ddee8dSDavid Howells /* Validate the data we just read. */ 321f3ddee8dSDavid Howells ret = -EIO; 322445b1028SDavid Howells if (!afs_dir_check_pages(dvnode, req)) 323b61f7dcfSDavid Howells goto error_unlock; 324f3ddee8dSDavid Howells 325f3ddee8dSDavid Howells // TODO: Trim excess pages 326f3ddee8dSDavid Howells 327f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 328f3ddee8dSDavid Howells } 329f3ddee8dSDavid Howells 330b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 331f3ddee8dSDavid Howells success: 332f3ddee8dSDavid Howells return req; 333f3ddee8dSDavid Howells 334f3ddee8dSDavid Howells error_unlock: 335b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 336f3ddee8dSDavid Howells error: 337f3ddee8dSDavid Howells afs_put_read(req); 338f3ddee8dSDavid Howells _leave(" = %d", ret); 339f3ddee8dSDavid Howells return ERR_PTR(ret); 340f3ddee8dSDavid Howells 341f3ddee8dSDavid Howells content_has_grown: 342b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 343f3ddee8dSDavid Howells afs_put_read(req); 344f3ddee8dSDavid Howells goto retry; 345f3ddee8dSDavid Howells } 346f3ddee8dSDavid Howells 347f3ddee8dSDavid Howells /* 3481da177e4SLinus Torvalds * deal with one block in an AFS directory 3491da177e4SLinus Torvalds */ 350f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 351f51375cdSDavid Howells struct dir_context *ctx, 35200317636SDavid Howells union afs_xdr_dir_block *block, 3531bbae9f8SAl Viro unsigned blkoff) 3541da177e4SLinus Torvalds { 35500317636SDavid Howells union afs_xdr_dirent *dire; 3561da177e4SLinus Torvalds unsigned offset, next, curr; 3571da177e4SLinus Torvalds size_t nlen; 3581bbae9f8SAl Viro int tmp; 3591da177e4SLinus Torvalds 3601bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3611da177e4SLinus Torvalds 36200317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3654ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3664ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3671da177e4SLinus Torvalds offset = next 3681da177e4SLinus Torvalds ) { 3691da177e4SLinus Torvalds next = offset + 1; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 37200317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3731da177e4SLinus Torvalds (1 << (offset % 8)))) { 3745b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 37500317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3761da177e4SLinus Torvalds if (offset >= curr) 3771bbae9f8SAl Viro ctx->pos = blkoff + 37800317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3791da177e4SLinus Torvalds continue; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* got a valid entry */ 3831da177e4SLinus Torvalds dire = &block->dirents[offset]; 3841da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3851da177e4SLinus Torvalds sizeof(*block) - 38600317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3871da177e4SLinus Torvalds 3885b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 38900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3901da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3911da177e4SLinus Torvalds nlen, dire->u.name); 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* work out where the next possible entry is */ 39400317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3954ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 3965b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3971da177e4SLinus Torvalds " %u travelled beyond end dir block" 3985b5e0928SAlexey Dobriyan " (len %u/%zu)", 39900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4001da177e4SLinus Torvalds offset, next, tmp, nlen); 401f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4021da177e4SLinus Torvalds } 40300317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 4041da177e4SLinus Torvalds (1 << (next % 8)))) { 4055b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4065b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 40700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4081da177e4SLinus Torvalds offset, next, tmp, nlen); 409f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 4125b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 41300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4141da177e4SLinus Torvalds next, tmp, nlen); 4151da177e4SLinus Torvalds next++; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* skip if starts before the current position */ 4191da177e4SLinus Torvalds if (offset < curr) 4201da177e4SLinus Torvalds continue; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* found the next entry */ 4231bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4241da177e4SLinus Torvalds ntohl(dire->u.vnode), 4255cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4265cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4271bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4281da177e4SLinus Torvalds _leave(" = 0 [full]"); 4291da177e4SLinus Torvalds return 0; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 43200317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds _leave(" = 1 [more]"); 4361da177e4SLinus Torvalds return 1; 437ec26815aSDavid Howells } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* 44008e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4411da177e4SLinus Torvalds */ 4421bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4439dd0b82eSDavid Howells struct key *key, afs_dataversion_t *_dir_version) 4441da177e4SLinus Torvalds { 445f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 44600317636SDavid Howells struct afs_xdr_dir_page *dbuf; 44700317636SDavid Howells union afs_xdr_dir_block *dblock; 448f3ddee8dSDavid Howells struct afs_read *req; 4491da177e4SLinus Torvalds struct page *page; 4501da177e4SLinus Torvalds unsigned blkoff, limit; 4511da177e4SLinus Torvalds int ret; 4521da177e4SLinus Torvalds 4531bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4541da177e4SLinus Torvalds 45508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4561da177e4SLinus Torvalds _leave(" = -ESTALE"); 4571da177e4SLinus Torvalds return -ESTALE; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 460f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 461f3ddee8dSDavid Howells if (IS_ERR(req)) 462f3ddee8dSDavid Howells return PTR_ERR(req); 4639dd0b82eSDavid Howells *_dir_version = req->data_version; 464f3ddee8dSDavid Howells 4651da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 46600317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 46700317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4701da177e4SLinus Torvalds ret = 0; 471f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 47200317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4731da177e4SLinus Torvalds 474f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 475f3ddee8dSDavid Howells * to the LRU. 476f3ddee8dSDavid Howells */ 477f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 478f3ddee8dSDavid Howells if (!page) { 479f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 4801da177e4SLinus Torvalds break; 4811da177e4SLinus Torvalds } 482f3ddee8dSDavid Howells mark_page_accessed(page); 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4851da177e4SLinus Torvalds 486f3ddee8dSDavid Howells dbuf = kmap(page); 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4891da177e4SLinus Torvalds do { 4901da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 49100317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 492f51375cdSDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); 4931da177e4SLinus Torvalds if (ret != 1) { 494f3ddee8dSDavid Howells kunmap(page); 4951da177e4SLinus Torvalds goto out; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 49800317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 4991da177e4SLinus Torvalds 5001bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 5011da177e4SLinus Torvalds 502f3ddee8dSDavid Howells kunmap(page); 5031da177e4SLinus Torvalds ret = 0; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds out: 507b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 508f3ddee8dSDavid Howells afs_put_read(req); 5091da177e4SLinus Torvalds _leave(" = %d", ret); 5101da177e4SLinus Torvalds return ret; 511ec26815aSDavid Howells } 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds /* 5141da177e4SLinus Torvalds * read an AFS directory 5151da177e4SLinus Torvalds */ 5161bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5171da177e4SLinus Torvalds { 5189dd0b82eSDavid Howells afs_dataversion_t dir_version; 5199dd0b82eSDavid Howells 5209dd0b82eSDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 5219dd0b82eSDavid Howells &dir_version); 522ec26815aSDavid Howells } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* 5255cf9dd55SDavid Howells * Search the directory for a single name 5261da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5271da177e4SLinus Torvalds * uniquifier through dtype 5281da177e4SLinus Torvalds */ 5295cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 530ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5311da177e4SLinus Torvalds { 5325cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5335cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5341da177e4SLinus Torvalds 5351bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5361bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 537ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5381da177e4SLinus Torvalds 53908e0e7c8SDavid Howells /* insanity checks first */ 54000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 54100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 54208e0e7c8SDavid Howells 5431bbae9f8SAl Viro if (cookie->name.len != nlen || 5441bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5451da177e4SLinus Torvalds _leave(" = 0 [no]"); 5461da177e4SLinus Torvalds return 0; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds cookie->fid.vnode = ino; 5501da177e4SLinus Torvalds cookie->fid.unique = dtype; 5511da177e4SLinus Torvalds cookie->found = 1; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds _leave(" = -1 [found]"); 5541da177e4SLinus Torvalds return -1; 555ec26815aSDavid Howells } 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds /* 5585cf9dd55SDavid Howells * Do a lookup of a single name in a directory 559260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5601da177e4SLinus Torvalds */ 5615cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 5629dd0b82eSDavid Howells struct afs_fid *fid, struct key *key, 5639dd0b82eSDavid Howells afs_dataversion_t *_dir_version) 5641da177e4SLinus Torvalds { 5651bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5665cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5675cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5681bbae9f8SAl Viro .name = dentry->d_name, 5691bbae9f8SAl Viro .fid.vid = as->volume->vid 5701bbae9f8SAl Viro }; 5711da177e4SLinus Torvalds int ret; 5721da177e4SLinus Torvalds 573a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds /* search the directory */ 5769dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 5771da177e4SLinus Torvalds if (ret < 0) { 57808e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 57908e0e7c8SDavid Howells return ret; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds ret = -ENOENT; 5831da177e4SLinus Torvalds if (!cookie.found) { 58408e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58508e0e7c8SDavid Howells return -ENOENT; 58608e0e7c8SDavid Howells } 58708e0e7c8SDavid Howells 58808e0e7c8SDavid Howells *fid = cookie.fid; 5893b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 59008e0e7c8SDavid Howells return 0; 59108e0e7c8SDavid Howells } 59208e0e7c8SDavid Howells 59308e0e7c8SDavid Howells /* 5945cf9dd55SDavid Howells * search the directory for a name 5955cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5965cf9dd55SDavid Howells * uniquifier through dtype 5975cf9dd55SDavid Howells */ 5985cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5995cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 6005cf9dd55SDavid Howells { 6015cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6025cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6035cf9dd55SDavid Howells int ret; 6045cf9dd55SDavid Howells 6055cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6065cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6075cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6085cf9dd55SDavid Howells 6095cf9dd55SDavid Howells /* insanity checks first */ 61000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 61100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6125cf9dd55SDavid Howells 6135cf9dd55SDavid Howells if (cookie->found) { 6145cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6155cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6165cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6175cf9dd55SDavid Howells cookie->nr_fids++; 6185cf9dd55SDavid Howells } 6195cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6205cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 6215cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 6225cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 6235cf9dd55SDavid Howells cookie->found = 1; 6245cf9dd55SDavid Howells if (cookie->one_only) 6255cf9dd55SDavid Howells return -1; 6265cf9dd55SDavid Howells } 6275cf9dd55SDavid Howells 6285cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6295cf9dd55SDavid Howells _leave(" = %d", ret); 6305cf9dd55SDavid Howells return ret; 6315cf9dd55SDavid Howells } 6325cf9dd55SDavid Howells 6335cf9dd55SDavid Howells /* 6345cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 6355cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 6365cf9dd55SDavid Howells * asked for is returned. 6375cf9dd55SDavid Howells */ 6385cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6395cf9dd55SDavid Howells struct key *key) 6405cf9dd55SDavid Howells { 6415cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 642f642404aSDavid Howells struct afs_cb_interest *dcbi, *cbi = NULL; 6435cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 64487182759SDavid Howells struct afs_status_cb *scb; 645b8359153SDavid Howells struct afs_iget_data iget_data; 6465cf9dd55SDavid Howells struct afs_fs_cursor fc; 647f642404aSDavid Howells struct afs_server *server; 64839db9815SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 64939db9815SDavid Howells struct inode *inode = NULL, *ti; 6509dd0b82eSDavid Howells afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 6515cf9dd55SDavid Howells int ret, i; 6525cf9dd55SDavid Howells 6535cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6545cf9dd55SDavid Howells 6555cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6565cf9dd55SDavid Howells if (!cookie) 6575cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6585cf9dd55SDavid Howells 6595cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6605cf9dd55SDavid Howells cookie->name = dentry->d_name; 6615cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6625cf9dd55SDavid Howells 6635cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 664f642404aSDavid Howells dcbi = rcu_dereference_protected(dvnode->cb_interest, 665f642404aSDavid Howells lockdep_is_held(&dvnode->cb_lock.lock)); 666f642404aSDavid Howells if (dcbi) { 667f642404aSDavid Howells server = dcbi->server; 668f642404aSDavid Howells if (server && 669f642404aSDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 6705cf9dd55SDavid Howells cookie->one_only = true; 671f642404aSDavid Howells } 6725cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6735cf9dd55SDavid Howells 6745cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6755cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6765cf9dd55SDavid Howells 6775cf9dd55SDavid Howells /* search the directory */ 6789dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 6795cf9dd55SDavid Howells if (ret < 0) { 6805cf9dd55SDavid Howells inode = ERR_PTR(ret); 6815cf9dd55SDavid Howells goto out; 6825cf9dd55SDavid Howells } 6835cf9dd55SDavid Howells 6849dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)data_version; 6859dd0b82eSDavid Howells 6865cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6875cf9dd55SDavid Howells if (!cookie->found) 6885cf9dd55SDavid Howells goto out; 6895cf9dd55SDavid Howells 6905cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 691b8359153SDavid Howells iget_data.fid = cookie->fids[0]; 692b8359153SDavid Howells iget_data.volume = dvnode->volume; 693b8359153SDavid Howells iget_data.cb_v_break = dvnode->volume->cb_v_break; 694b8359153SDavid Howells iget_data.cb_s_break = 0; 695b8359153SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, 696b8359153SDavid Howells afs_iget5_test, &iget_data); 6975cf9dd55SDavid Howells if (inode) 6985cf9dd55SDavid Howells goto out; 6995cf9dd55SDavid Howells 7005cf9dd55SDavid Howells /* Need space for examining all the selected files */ 7015cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 70287182759SDavid Howells cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb), 7035cf9dd55SDavid Howells GFP_KERNEL); 7045cf9dd55SDavid Howells if (!cookie->statuses) 7055cf9dd55SDavid Howells goto out; 7065cf9dd55SDavid Howells 70739db9815SDavid Howells cookie->inodes = kcalloc(cookie->nr_fids, sizeof(struct inode *), 70839db9815SDavid Howells GFP_KERNEL); 70939db9815SDavid Howells if (!cookie->inodes) 71039db9815SDavid Howells goto out_s; 71139db9815SDavid Howells 71239db9815SDavid Howells for (i = 1; i < cookie->nr_fids; i++) { 71339db9815SDavid Howells scb = &cookie->statuses[i]; 71439db9815SDavid Howells 71539db9815SDavid Howells /* Find any inodes that already exist and get their 71639db9815SDavid Howells * callback counters. 71739db9815SDavid Howells */ 71839db9815SDavid Howells iget_data.fid = cookie->fids[i]; 71939db9815SDavid Howells ti = ilookup5_nowait(dir->i_sb, iget_data.fid.vnode, 72039db9815SDavid Howells afs_iget5_test, &iget_data); 72139db9815SDavid Howells if (!IS_ERR_OR_NULL(ti)) { 72239db9815SDavid Howells vnode = AFS_FS_I(ti); 72339db9815SDavid Howells scb->cb_break = afs_calc_vnode_cb_break(vnode); 72439db9815SDavid Howells cookie->inodes[i] = ti; 72539db9815SDavid Howells } 72639db9815SDavid Howells } 72739db9815SDavid Howells 7285cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 7295cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 7305cf9dd55SDavid Howells * the whole operation. 7315cf9dd55SDavid Howells */ 7325cf9dd55SDavid Howells if (cookie->one_only) 7335cf9dd55SDavid Howells goto no_inline_bulk_status; 7345cf9dd55SDavid Howells 7355cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 73620b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7375cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7385cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 7395cf9dd55SDavid Howells &fc.cbi->server->flags)) { 7405cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 7415cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 7425cf9dd55SDavid Howells break; 7435cf9dd55SDavid Howells } 744b8359153SDavid Howells iget_data.cb_v_break = dvnode->volume->cb_v_break; 745b8359153SDavid Howells iget_data.cb_s_break = fc.cbi->server->cb_s_break; 7465cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 7475cf9dd55SDavid Howells afs_v2net(dvnode), 7485cf9dd55SDavid Howells cookie->fids, 7495cf9dd55SDavid Howells cookie->statuses, 7505cf9dd55SDavid Howells cookie->nr_fids, NULL); 7515cf9dd55SDavid Howells } 7525cf9dd55SDavid Howells 7535cf9dd55SDavid Howells if (fc.ac.error == 0) 7545cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7555cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 7565cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 7575cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7585cf9dd55SDavid Howells } 7595cf9dd55SDavid Howells 7605cf9dd55SDavid Howells if (!IS_ERR(inode)) 7615cf9dd55SDavid Howells goto success; 7625cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 7635cf9dd55SDavid Howells goto out_c; 7645cf9dd55SDavid Howells 7655cf9dd55SDavid Howells no_inline_bulk_status: 7665cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7675cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7685cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7695cf9dd55SDavid Howells */ 7705cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 77120b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7725cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 773b8359153SDavid Howells iget_data.cb_v_break = dvnode->volume->cb_v_break; 774b8359153SDavid Howells iget_data.cb_s_break = fc.cbi->server->cb_s_break; 77587182759SDavid Howells scb = &cookie->statuses[0]; 7765cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7775cf9dd55SDavid Howells afs_v2net(dvnode), 7785cf9dd55SDavid Howells cookie->fids, 779a58823acSDavid Howells scb, 7805cf9dd55SDavid Howells NULL); 7815cf9dd55SDavid Howells } 7825cf9dd55SDavid Howells 7835cf9dd55SDavid Howells if (fc.ac.error == 0) 7845cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7855cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7865cf9dd55SDavid Howells } 7875cf9dd55SDavid Howells 7885cf9dd55SDavid Howells if (IS_ERR(inode)) 7895cf9dd55SDavid Howells goto out_c; 7905cf9dd55SDavid Howells 7915cf9dd55SDavid Howells success: 7925cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7935cf9dd55SDavid Howells * one we actually want. 7945cf9dd55SDavid Howells */ 79587182759SDavid Howells scb = &cookie->statuses[0]; 79687182759SDavid Howells if (scb->status.abort_code != 0) 79787182759SDavid Howells inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code)); 7985cf9dd55SDavid Howells 7995cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 80087182759SDavid Howells struct afs_status_cb *scb = &cookie->statuses[i]; 80139db9815SDavid Howells 80239db9815SDavid Howells if (!scb->have_status && !scb->have_error) 80339db9815SDavid Howells continue; 80439db9815SDavid Howells 80539db9815SDavid Howells if (cookie->inodes[i]) { 806a28f239eSDavid Howells struct afs_vnode *iv = AFS_FS_I(cookie->inodes[i]); 807a28f239eSDavid Howells 808a28f239eSDavid Howells if (test_bit(AFS_VNODE_UNSET, &iv->flags)) 809a28f239eSDavid Howells continue; 810a28f239eSDavid Howells 811a28f239eSDavid Howells afs_vnode_commit_status(&fc, iv, 81239db9815SDavid Howells scb->cb_break, NULL, scb); 81339db9815SDavid Howells continue; 81439db9815SDavid Howells } 8155cf9dd55SDavid Howells 81687182759SDavid Howells if (scb->status.abort_code != 0) 8175cf9dd55SDavid Howells continue; 8185cf9dd55SDavid Howells 819b8359153SDavid Howells iget_data.fid = cookie->fids[i]; 820b8359153SDavid Howells ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode); 82139db9815SDavid Howells if (!IS_ERR(ti)) 82239db9815SDavid Howells afs_cache_permit(AFS_FS_I(ti), key, 82339db9815SDavid Howells 0 /* Assume vnode->cb_break is 0 */ + 82439db9815SDavid Howells iget_data.cb_v_break, 82539db9815SDavid Howells scb); 8265cf9dd55SDavid Howells if (i == 0) { 8275cf9dd55SDavid Howells inode = ti; 8285cf9dd55SDavid Howells } else { 8295cf9dd55SDavid Howells if (!IS_ERR(ti)) 8305cf9dd55SDavid Howells iput(ti); 8315cf9dd55SDavid Howells } 8325cf9dd55SDavid Howells } 8335cf9dd55SDavid Howells 8345cf9dd55SDavid Howells out_c: 8355cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 83639db9815SDavid Howells if (cookie->inodes) { 83739db9815SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 83839db9815SDavid Howells iput(cookie->inodes[i]); 83939db9815SDavid Howells kfree(cookie->inodes); 84039db9815SDavid Howells } 84139db9815SDavid Howells out_s: 84287182759SDavid Howells kvfree(cookie->statuses); 8435cf9dd55SDavid Howells out: 8445cf9dd55SDavid Howells kfree(cookie); 8455cf9dd55SDavid Howells return inode; 8465cf9dd55SDavid Howells } 8475cf9dd55SDavid Howells 8485cf9dd55SDavid Howells /* 8496f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 8506f8880d8SDavid Howells */ 8516f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 8526f8880d8SDavid Howells struct key *key) 8536f8880d8SDavid Howells { 8546f8880d8SDavid Howells struct afs_sysnames *subs; 8556f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8566f8880d8SDavid Howells struct dentry *ret; 8576f8880d8SDavid Howells char *buf, *p, *name; 8586f8880d8SDavid Howells int len, i; 8596f8880d8SDavid Howells 8606f8880d8SDavid Howells _enter(""); 8616f8880d8SDavid Howells 8626f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8636f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8646f8880d8SDavid Howells if (!buf) 8656f8880d8SDavid Howells goto out_p; 8666f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8676f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8686f8880d8SDavid Howells p += dentry->d_name.len - 4; 8696f8880d8SDavid Howells } 8706f8880d8SDavid Howells 8716f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8726f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8736f8880d8SDavid Howells subs = net->sysnames; 8746f8880d8SDavid Howells refcount_inc(&subs->usage); 8756f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8766f8880d8SDavid Howells 8776f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8786f8880d8SDavid Howells name = subs->subs[i]; 8796f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8806f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8816f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8826f8880d8SDavid Howells goto out_s; 8836f8880d8SDavid Howells } 8846f8880d8SDavid Howells 8856f8880d8SDavid Howells strcpy(p, name); 8866f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8876f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8886f8880d8SDavid Howells goto out_s; 8896f8880d8SDavid Howells dput(ret); 8906f8880d8SDavid Howells } 8916f8880d8SDavid Howells 8926f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8936f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8946f8880d8SDavid Howells */ 8956f8880d8SDavid Howells ret = NULL; 8966f8880d8SDavid Howells out_s: 8976f8880d8SDavid Howells afs_put_sysnames(subs); 8986f8880d8SDavid Howells kfree(buf); 8996f8880d8SDavid Howells out_p: 9006f8880d8SDavid Howells key_put(key); 9016f8880d8SDavid Howells return ret; 9026f8880d8SDavid Howells } 9036f8880d8SDavid Howells 9046f8880d8SDavid Howells /* 90508e0e7c8SDavid Howells * look up an entry in a directory 90608e0e7c8SDavid Howells */ 907260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 90800cd8dd3SAl Viro unsigned int flags) 90908e0e7c8SDavid Howells { 9105cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 91140a708bdSDavid Howells struct afs_fid fid = {}; 91208e0e7c8SDavid Howells struct inode *inode; 91334b2a88fSAl Viro struct dentry *d; 91400d3b7a4SDavid Howells struct key *key; 91508e0e7c8SDavid Howells int ret; 91608e0e7c8SDavid Howells 9173b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 9185cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 919260a9803SDavid Howells 9202b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 92108e0e7c8SDavid Howells 92245222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 92308e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 92408e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 92508e0e7c8SDavid Howells } 92608e0e7c8SDavid Howells 9275cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 92808e0e7c8SDavid Howells _leave(" = -ESTALE"); 92908e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 93008e0e7c8SDavid Howells } 93108e0e7c8SDavid Howells 9325cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 93300d3b7a4SDavid Howells if (IS_ERR(key)) { 93400d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 935e231c2eeSDavid Howells return ERR_CAST(key); 93600d3b7a4SDavid Howells } 93700d3b7a4SDavid Howells 9385cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 93908e0e7c8SDavid Howells if (ret < 0) { 94000d3b7a4SDavid Howells key_put(key); 941260a9803SDavid Howells _leave(" = %d [val]", ret); 9421da177e4SLinus Torvalds return ERR_PTR(ret); 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds 9456f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 9466f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 9476f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 9486f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 9496f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 9506f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 9516f8880d8SDavid Howells 952d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 9535cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 95434b2a88fSAl Viro key_put(key); 95534b2a88fSAl Viro if (inode == ERR_PTR(-ENOENT)) { 9565cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 95734b2a88fSAl Viro } else { 95834b2a88fSAl Viro dentry->d_fsdata = 95934b2a88fSAl Viro (void *)(unsigned long)dvnode->status.data_version; 960bec5eb61Swanglei } 96140a708bdSDavid Howells 96240a708bdSDavid Howells if (!IS_ERR_OR_NULL(inode)) 96340a708bdSDavid Howells fid = AFS_FS_I(inode)->fid; 96440a708bdSDavid Howells 96534b2a88fSAl Viro d = d_splice_alias(inode, dentry); 96680548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 96734b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 96840a708bdSDavid Howells trace_afs_lookup(dvnode, &d->d_name, &fid); 96980548b03SDavid Howells } else { 97040a708bdSDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, &fid); 97180548b03SDavid Howells } 97234b2a88fSAl Viro return d; 973ec26815aSDavid Howells } 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds /* 976a0753c29SDavid Howells * Check the validity of a dentry under RCU conditions. 977a0753c29SDavid Howells */ 978a0753c29SDavid Howells static int afs_d_revalidate_rcu(struct dentry *dentry) 979a0753c29SDavid Howells { 980a0753c29SDavid Howells struct afs_vnode *dvnode, *vnode; 981a0753c29SDavid Howells struct dentry *parent; 982a0753c29SDavid Howells struct inode *dir, *inode; 983a0753c29SDavid Howells long dir_version, de_version; 984a0753c29SDavid Howells 985a0753c29SDavid Howells _enter("%p", dentry); 986a0753c29SDavid Howells 987a0753c29SDavid Howells /* Check the parent directory is still valid first. */ 988a0753c29SDavid Howells parent = READ_ONCE(dentry->d_parent); 989a0753c29SDavid Howells dir = d_inode_rcu(parent); 990a0753c29SDavid Howells if (!dir) 991a0753c29SDavid Howells return -ECHILD; 992a0753c29SDavid Howells dvnode = AFS_FS_I(dir); 993a0753c29SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 994a0753c29SDavid Howells return -ECHILD; 995a0753c29SDavid Howells 996a0753c29SDavid Howells if (!afs_check_validity(dvnode)) 997a0753c29SDavid Howells return -ECHILD; 998a0753c29SDavid Howells 999a0753c29SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1000a0753c29SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1001a0753c29SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1002a0753c29SDavid Howells * version. 1003a0753c29SDavid Howells */ 1004a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->status.data_version); 1005a0753c29SDavid Howells de_version = (long)READ_ONCE(dentry->d_fsdata); 1006a0753c29SDavid Howells if (de_version != dir_version) { 1007a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->invalid_before); 1008a0753c29SDavid Howells if (de_version - dir_version < 0) 1009a0753c29SDavid Howells return -ECHILD; 1010a0753c29SDavid Howells } 1011a0753c29SDavid Howells 1012a0753c29SDavid Howells /* Check to see if the vnode referred to by the dentry still 1013a0753c29SDavid Howells * has a callback. 1014a0753c29SDavid Howells */ 1015a0753c29SDavid Howells if (d_really_is_positive(dentry)) { 1016a0753c29SDavid Howells inode = d_inode_rcu(dentry); 1017a0753c29SDavid Howells if (inode) { 1018a0753c29SDavid Howells vnode = AFS_FS_I(inode); 1019a0753c29SDavid Howells if (!afs_check_validity(vnode)) 1020a0753c29SDavid Howells return -ECHILD; 1021a0753c29SDavid Howells } 1022a0753c29SDavid Howells } 1023a0753c29SDavid Howells 1024a0753c29SDavid Howells return 1; /* Still valid */ 1025a0753c29SDavid Howells } 1026a0753c29SDavid Howells 1027a0753c29SDavid Howells /* 10281da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 10291da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 10301da177e4SLinus Torvalds * inode 10311da177e4SLinus Torvalds */ 10320b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 10331da177e4SLinus Torvalds { 1034260a9803SDavid Howells struct afs_vnode *vnode, *dir; 1035dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 10361da177e4SLinus Torvalds struct dentry *parent; 1037c435ee34SDavid Howells struct inode *inode; 103800d3b7a4SDavid Howells struct key *key; 10399dd0b82eSDavid Howells afs_dataversion_t dir_version; 10409dd0b82eSDavid Howells long de_version; 10411da177e4SLinus Torvalds int ret; 10421da177e4SLinus Torvalds 10430b728e19SAl Viro if (flags & LOOKUP_RCU) 1044a0753c29SDavid Howells return afs_d_revalidate_rcu(dentry); 104534286d66SNick Piggin 1046c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 10472b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 10483b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1049a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 1050260a9803SDavid Howells vnode->flags); 1051c435ee34SDavid Howells } else { 1052a455589fSAl Viro _enter("{neg n=%pd}", dentry); 1053c435ee34SDavid Howells } 10541da177e4SLinus Torvalds 1055260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 105600d3b7a4SDavid Howells if (IS_ERR(key)) 105700d3b7a4SDavid Howells key = NULL; 105800d3b7a4SDavid Howells 1059c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 1060c435ee34SDavid Howells inode = d_inode(dentry); 1061c435ee34SDavid Howells if (inode) { 1062c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1063c435ee34SDavid Howells afs_validate(vnode, key); 1064c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1065c435ee34SDavid Howells goto out_bad; 1066c435ee34SDavid Howells } 1067c435ee34SDavid Howells } 1068c435ee34SDavid Howells 10691da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 107008e0e7c8SDavid Howells parent = dget_parent(dentry); 10712b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 10721da177e4SLinus Torvalds 1073260a9803SDavid Howells /* validate the parent directory */ 1074260a9803SDavid Howells afs_validate(dir, key); 1075260a9803SDavid Howells 1076260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1077a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 1078c435ee34SDavid Howells goto out_bad_parent; 10791da177e4SLinus Torvalds } 10801da177e4SLinus Torvalds 1081a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1082a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1083a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1084a4ff7401SDavid Howells * version. 1085a4ff7401SDavid Howells */ 10869dd0b82eSDavid Howells dir_version = dir->status.data_version; 1087a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 10889dd0b82eSDavid Howells if (de_version == (long)dir_version) 10895dc84855SDavid Howells goto out_valid_noupdate; 1090a4ff7401SDavid Howells 10919dd0b82eSDavid Howells dir_version = dir->invalid_before; 10929dd0b82eSDavid Howells if (de_version - (long)dir_version >= 0) 1093a4ff7401SDavid Howells goto out_valid; 1094260a9803SDavid Howells 109508e0e7c8SDavid Howells _debug("dir modified"); 1096d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds /* search the directory for this vnode */ 10999dd0b82eSDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); 1100260a9803SDavid Howells switch (ret) { 1101260a9803SDavid Howells case 0: 1102260a9803SDavid Howells /* the filename maps to something */ 11032b0143b5SDavid Howells if (d_really_is_negative(dentry)) 1104c435ee34SDavid Howells goto out_bad_parent; 1105c435ee34SDavid Howells inode = d_inode(dentry); 1106c435ee34SDavid Howells if (is_bad_inode(inode)) { 1107a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1108a455589fSAl Viro dentry); 1109c435ee34SDavid Howells goto out_bad_parent; 11101da177e4SLinus Torvalds } 11111da177e4SLinus Torvalds 1112c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1113c435ee34SDavid Howells 11141da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 11151da177e4SLinus Torvalds * different file */ 111608e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 11173b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1118a455589fSAl Viro dentry, fid.vnode, 111908e0e7c8SDavid Howells vnode->fid.vnode); 11201da177e4SLinus Torvalds goto not_found; 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1124260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1125260a9803SDavid Howells * been reused */ 112608e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1127a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1128a455589fSAl Viro dentry, fid.unique, 11297a224228SJean Noel Cordenner vnode->fid.unique, 1130c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1131c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 113208e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1133c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1134260a9803SDavid Howells goto not_found; 1135260a9803SDavid Howells } 1136260a9803SDavid Howells goto out_valid; 1137260a9803SDavid Howells 1138260a9803SDavid Howells case -ENOENT: 1139260a9803SDavid Howells /* the filename is unknown */ 1140a455589fSAl Viro _debug("%pd: dirent not found", dentry); 11412b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1142260a9803SDavid Howells goto not_found; 1143260a9803SDavid Howells goto out_valid; 1144260a9803SDavid Howells 1145260a9803SDavid Howells default: 1146a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1147a455589fSAl Viro parent, ret); 1148c435ee34SDavid Howells goto out_bad_parent; 11491da177e4SLinus Torvalds } 115008e0e7c8SDavid Howells 11511da177e4SLinus Torvalds out_valid: 11529dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)dir_version; 11535dc84855SDavid Howells out_valid_noupdate: 11541da177e4SLinus Torvalds dput(parent); 115500d3b7a4SDavid Howells key_put(key); 11561da177e4SLinus Torvalds _leave(" = 1 [valid]"); 11571da177e4SLinus Torvalds return 1; 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 11601da177e4SLinus Torvalds not_found: 11611da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 11621da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 11631da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 11641da177e4SLinus Torvalds 1165c435ee34SDavid Howells out_bad_parent: 1166a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 11671da177e4SLinus Torvalds dput(parent); 1168c435ee34SDavid Howells out_bad: 116900d3b7a4SDavid Howells key_put(key); 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds _leave(" = 0 [bad]"); 11721da177e4SLinus Torvalds return 0; 1173ec26815aSDavid Howells } 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds /* 11761da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 11771da177e4SLinus Torvalds * sleep) 11781da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 11791da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 11801da177e4SLinus Torvalds */ 1181fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 11821da177e4SLinus Torvalds { 1183a455589fSAl Viro _enter("%pd", dentry); 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 11861da177e4SLinus Torvalds goto zap; 11871da177e4SLinus Torvalds 11882b0143b5SDavid Howells if (d_really_is_positive(dentry) && 11892b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 11902b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 11911da177e4SLinus Torvalds goto zap; 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds _leave(" = 0 [keep]"); 11941da177e4SLinus Torvalds return 0; 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds zap: 11971da177e4SLinus Torvalds _leave(" = 1 [zap]"); 11981da177e4SLinus Torvalds return 1; 1199ec26815aSDavid Howells } 1200260a9803SDavid Howells 1201260a9803SDavid Howells /* 120279ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 120379ddbfa5SDavid Howells */ 120479ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 120579ddbfa5SDavid Howells { 120679ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 120779ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 120879ddbfa5SDavid Howells iput(inode); 120979ddbfa5SDavid Howells } 121079ddbfa5SDavid Howells 121179ddbfa5SDavid Howells /* 1212260a9803SDavid Howells * handle dentry release 1213260a9803SDavid Howells */ 121466c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1215260a9803SDavid Howells { 1216a455589fSAl Viro _enter("%pd", dentry); 1217260a9803SDavid Howells } 1218260a9803SDavid Howells 1219260a9803SDavid Howells /* 1220d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1221d2ddc776SDavid Howells */ 1222d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1223d2ddc776SDavid Howells struct dentry *new_dentry, 1224b8359153SDavid Howells struct afs_iget_data *new_data, 1225a58823acSDavid Howells struct afs_status_cb *new_scb) 1226d2ddc776SDavid Howells { 12275a813276SDavid Howells struct afs_vnode *vnode; 1228d2ddc776SDavid Howells struct inode *inode; 1229d2ddc776SDavid Howells 1230d2ddc776SDavid Howells if (fc->ac.error < 0) 1231d2ddc776SDavid Howells return; 1232d2ddc776SDavid Howells 1233d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1234b8359153SDavid Howells new_data, new_scb, fc->cbi, fc->vnode); 1235d2ddc776SDavid Howells if (IS_ERR(inode)) { 1236d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1237d2ddc776SDavid Howells * the new directory on the server. 1238d2ddc776SDavid Howells */ 1239d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1240d2ddc776SDavid Howells return; 1241d2ddc776SDavid Howells } 1242d2ddc776SDavid Howells 12435a813276SDavid Howells vnode = AFS_FS_I(inode); 12445a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1245a58823acSDavid Howells if (fc->ac.error == 0) 1246a58823acSDavid Howells afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb); 124773116df7SDavid Howells d_instantiate(new_dentry, inode); 1248d2ddc776SDavid Howells } 1249d2ddc776SDavid Howells 1250b8359153SDavid Howells static void afs_prep_for_new_inode(struct afs_fs_cursor *fc, 1251b8359153SDavid Howells struct afs_iget_data *iget_data) 1252b8359153SDavid Howells { 1253b8359153SDavid Howells iget_data->volume = fc->vnode->volume; 1254b8359153SDavid Howells iget_data->cb_v_break = fc->vnode->volume->cb_v_break; 1255b8359153SDavid Howells iget_data->cb_s_break = fc->cbi->server->cb_s_break; 1256b8359153SDavid Howells } 1257b8359153SDavid Howells 1258d2ddc776SDavid Howells /* 12599dd0b82eSDavid Howells * Note that a dentry got changed. We need to set d_fsdata to the data version 12609dd0b82eSDavid Howells * number derived from the result of the operation. It doesn't matter if 12619dd0b82eSDavid Howells * d_fsdata goes backwards as we'll just revalidate. 12629dd0b82eSDavid Howells */ 12639dd0b82eSDavid Howells static void afs_update_dentry_version(struct afs_fs_cursor *fc, 12649dd0b82eSDavid Howells struct dentry *dentry, 12659dd0b82eSDavid Howells struct afs_status_cb *scb) 12669dd0b82eSDavid Howells { 12679dd0b82eSDavid Howells if (fc->ac.error == 0) 12689dd0b82eSDavid Howells dentry->d_fsdata = 12699dd0b82eSDavid Howells (void *)(unsigned long)scb->status.data_version; 12709dd0b82eSDavid Howells } 12719dd0b82eSDavid Howells 12729dd0b82eSDavid Howells /* 1273260a9803SDavid Howells * create a directory on an AFS filesystem 1274260a9803SDavid Howells */ 127518bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1276260a9803SDavid Howells { 1277b8359153SDavid Howells struct afs_iget_data iget_data; 1278a58823acSDavid Howells struct afs_status_cb *scb; 1279d2ddc776SDavid Howells struct afs_fs_cursor fc; 1280d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1281260a9803SDavid Howells struct key *key; 1282260a9803SDavid Howells int ret; 1283260a9803SDavid Howells 1284d2ddc776SDavid Howells mode |= S_IFDIR; 1285260a9803SDavid Howells 12863b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1287a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1288260a9803SDavid Howells 1289a58823acSDavid Howells ret = -ENOMEM; 1290a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1291a58823acSDavid Howells if (!scb) 1292a58823acSDavid Howells goto error; 1293a58823acSDavid Howells 1294260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1295260a9803SDavid Howells if (IS_ERR(key)) { 1296260a9803SDavid Howells ret = PTR_ERR(key); 1297a58823acSDavid Howells goto error_scb; 1298260a9803SDavid Howells } 1299260a9803SDavid Howells 1300d2ddc776SDavid Howells ret = -ERESTARTSYS; 130120b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1302a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1303a58823acSDavid Howells 1304d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 130568251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1306b8359153SDavid Howells afs_prep_for_new_inode(&fc, &iget_data); 1307a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1308b8359153SDavid Howells &scb[0], &iget_data.fid, &scb[1]); 1309d2ddc776SDavid Howells } 1310d2ddc776SDavid Howells 1311a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1312a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1313a58823acSDavid Howells &data_version, &scb[0]); 13149dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1315b8359153SDavid Howells afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); 1316d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1317260a9803SDavid Howells if (ret < 0) 1318d2ddc776SDavid Howells goto error_key; 13194433b691SDavid Howells } else { 13204433b691SDavid Howells goto error_key; 1321260a9803SDavid Howells } 1322260a9803SDavid Howells 132363a4681fSDavid Howells if (ret == 0 && 132463a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1325b8359153SDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, 132663a4681fSDavid Howells afs_edit_dir_for_create); 132763a4681fSDavid Howells 1328260a9803SDavid Howells key_put(key); 1329a58823acSDavid Howells kfree(scb); 1330260a9803SDavid Howells _leave(" = 0"); 1331260a9803SDavid Howells return 0; 1332260a9803SDavid Howells 1333d2ddc776SDavid Howells error_key: 1334260a9803SDavid Howells key_put(key); 1335a58823acSDavid Howells error_scb: 1336a58823acSDavid Howells kfree(scb); 1337260a9803SDavid Howells error: 1338260a9803SDavid Howells d_drop(dentry); 1339260a9803SDavid Howells _leave(" = %d", ret); 1340260a9803SDavid Howells return ret; 1341260a9803SDavid Howells } 1342260a9803SDavid Howells 1343260a9803SDavid Howells /* 1344d2ddc776SDavid Howells * Remove a subdir from a directory. 1345260a9803SDavid Howells */ 1346d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1347260a9803SDavid Howells { 13482b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1349d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1350d2ddc776SDavid Howells 1351260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1352260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1353c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 135463a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1355260a9803SDavid Howells } 1356260a9803SDavid Howells } 1357260a9803SDavid Howells 1358260a9803SDavid Howells /* 1359d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1360260a9803SDavid Howells */ 1361d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1362260a9803SDavid Howells { 1363a58823acSDavid Howells struct afs_status_cb *scb; 1364d2ddc776SDavid Howells struct afs_fs_cursor fc; 1365f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1366260a9803SDavid Howells struct key *key; 1367260a9803SDavid Howells int ret; 1368260a9803SDavid Howells 13693b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1370a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1371260a9803SDavid Howells 1372a58823acSDavid Howells scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); 1373a58823acSDavid Howells if (!scb) 1374a58823acSDavid Howells return -ENOMEM; 1375a58823acSDavid Howells 1376260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1377260a9803SDavid Howells if (IS_ERR(key)) { 1378260a9803SDavid Howells ret = PTR_ERR(key); 1379260a9803SDavid Howells goto error; 1380260a9803SDavid Howells } 1381260a9803SDavid Howells 1382f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1383f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1384f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1385f58db83fSDavid Howells ret = afs_validate(vnode, key); 1386f58db83fSDavid Howells if (ret < 0) 1387f58db83fSDavid Howells goto error_key; 1388f58db83fSDavid Howells } 1389f58db83fSDavid Howells 139079ddbfa5SDavid Howells if (vnode) { 139179ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 139279ddbfa5SDavid Howells if (ret < 0) 139379ddbfa5SDavid Howells goto error_key; 139479ddbfa5SDavid Howells } 139579ddbfa5SDavid Howells 1396d2ddc776SDavid Howells ret = -ERESTARTSYS; 139720b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1398a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1399a58823acSDavid Howells 1400d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 140168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1402a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb); 1403260a9803SDavid Howells } 1404260a9803SDavid Howells 1405a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1406a58823acSDavid Howells &data_version, scb); 14079dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, scb); 1408d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 140963a4681fSDavid Howells if (ret == 0) { 1410d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 141163a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 141263a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 141363a4681fSDavid Howells afs_edit_dir_for_rmdir); 141463a4681fSDavid Howells } 1415260a9803SDavid Howells } 1416260a9803SDavid Howells 141779ddbfa5SDavid Howells if (vnode) 141879ddbfa5SDavid Howells up_write(&vnode->rmdir_lock); 1419f58db83fSDavid Howells error_key: 1420260a9803SDavid Howells key_put(key); 1421d2ddc776SDavid Howells error: 1422a58823acSDavid Howells kfree(scb); 1423d2ddc776SDavid Howells return ret; 1424d2ddc776SDavid Howells } 1425260a9803SDavid Howells 1426d2ddc776SDavid Howells /* 1427d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1428d2ddc776SDavid Howells * 1429d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1430d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1431d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1432d2ddc776SDavid Howells * 1433d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1434d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1435d2ddc776SDavid Howells */ 1436a38a7558SDavid Howells static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry, 1437a38a7558SDavid Howells struct key *key) 1438d2ddc776SDavid Howells { 1439d2ddc776SDavid Howells int ret = 0; 1440d2ddc776SDavid Howells 1441d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1442d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1443d2ddc776SDavid Howells 144430062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 144530062bd1SDavid Howells /* Already done */ 1446a38a7558SDavid Howells } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1447a38a7558SDavid Howells write_seqlock(&vnode->cb_lock); 1448440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1449440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1450440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1451051d2525SDavid Howells __afs_break_callback(vnode, afs_cb_break_for_unlink); 1452440fbc3aSDavid Howells } 1453a38a7558SDavid Howells write_sequnlock(&vnode->cb_lock); 1454440fbc3aSDavid Howells ret = 0; 1455440fbc3aSDavid Howells } else { 1456051d2525SDavid Howells afs_break_callback(vnode, afs_cb_break_for_unlink); 1457440fbc3aSDavid Howells 1458d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1459d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1460d2ddc776SDavid Howells 1461d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1462d2ddc776SDavid Howells if (ret == -ESTALE) 1463d2ddc776SDavid Howells ret = 0; 1464440fbc3aSDavid Howells } 1465d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1466d2ddc776SDavid Howells } 1467d2ddc776SDavid Howells 1468d2ddc776SDavid Howells return ret; 1469d2ddc776SDavid Howells } 1470d2ddc776SDavid Howells 1471d2ddc776SDavid Howells /* 1472d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1473d2ddc776SDavid Howells */ 1474d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1475d2ddc776SDavid Howells { 1476d2ddc776SDavid Howells struct afs_fs_cursor fc; 1477a58823acSDavid Howells struct afs_status_cb *scb; 1478fa59f52fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1479fa59f52fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1480d2ddc776SDavid Howells struct key *key; 148179ddbfa5SDavid Howells bool need_rehash = false; 1482d2ddc776SDavid Howells int ret; 1483d2ddc776SDavid Howells 14843b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1485d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1486d2ddc776SDavid Howells 1487d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1488d2ddc776SDavid Howells return -ENAMETOOLONG; 1489d2ddc776SDavid Howells 1490a58823acSDavid Howells ret = -ENOMEM; 1491a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1492a58823acSDavid Howells if (!scb) 1493a58823acSDavid Howells goto error; 1494a58823acSDavid Howells 1495d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1496d2ddc776SDavid Howells if (IS_ERR(key)) { 1497d2ddc776SDavid Howells ret = PTR_ERR(key); 1498a58823acSDavid Howells goto error_scb; 1499d2ddc776SDavid Howells } 1500d2ddc776SDavid Howells 1501d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1502d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1503d2ddc776SDavid Howells if (ret < 0) 1504d2ddc776SDavid Howells goto error_key; 1505d2ddc776SDavid Howells 150679ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 1507fa59f52fSDavid Howells if (d_count(dentry) > 1) { 150879ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 150979ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 151079ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 151179ddbfa5SDavid Howells ret = afs_sillyrename(dvnode, vnode, dentry, key); 151279ddbfa5SDavid Howells goto error_key; 151379ddbfa5SDavid Howells } 151479ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 151579ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 151679ddbfa5SDavid Howells __d_drop(dentry); 151779ddbfa5SDavid Howells need_rehash = true; 151879ddbfa5SDavid Howells } 151979ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 152079ddbfa5SDavid Howells 1521d2ddc776SDavid Howells ret = -ERESTARTSYS; 152220b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1523a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1524a38a7558SDavid Howells afs_dataversion_t data_version_2 = vnode->status.data_version; 1525a58823acSDavid Howells 1526d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 152768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1528a38a7558SDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 152930062bd1SDavid Howells 153030062bd1SDavid Howells if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && 153130062bd1SDavid Howells !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { 153230062bd1SDavid Howells yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, 1533a58823acSDavid Howells &scb[0], &scb[1]); 153430062bd1SDavid Howells if (fc.ac.error != -ECONNABORTED || 153530062bd1SDavid Howells fc.ac.abort_code != RXGEN_OPCODE) 153630062bd1SDavid Howells continue; 153730062bd1SDavid Howells set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); 153830062bd1SDavid Howells } 153930062bd1SDavid Howells 1540a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]); 1541d2ddc776SDavid Howells } 1542d2ddc776SDavid Howells 1543a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1544a58823acSDavid Howells &data_version, &scb[0]); 1545a38a7558SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, 1546a38a7558SDavid Howells &data_version_2, &scb[1]); 15479dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1548d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1549a38a7558SDavid Howells if (ret == 0 && !(scb[1].have_status || scb[1].have_error)) 1550a38a7558SDavid Howells ret = afs_dir_remove_link(dvnode, dentry, key); 155163a4681fSDavid Howells if (ret == 0 && 155263a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 155363a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 155463a4681fSDavid Howells afs_edit_dir_for_unlink); 1555d2ddc776SDavid Howells } 1556d2ddc776SDavid Howells 155779ddbfa5SDavid Howells if (need_rehash && ret < 0 && ret != -ENOENT) 155879ddbfa5SDavid Howells d_rehash(dentry); 155979ddbfa5SDavid Howells 1560d2ddc776SDavid Howells error_key: 1561260a9803SDavid Howells key_put(key); 1562a58823acSDavid Howells error_scb: 1563a58823acSDavid Howells kfree(scb); 1564260a9803SDavid Howells error: 1565260a9803SDavid Howells _leave(" = %d", ret); 1566260a9803SDavid Howells return ret; 1567260a9803SDavid Howells } 1568260a9803SDavid Howells 1569260a9803SDavid Howells /* 1570260a9803SDavid Howells * create a regular file on an AFS filesystem 1571260a9803SDavid Howells */ 15724acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1573ebfc3b49SAl Viro bool excl) 1574260a9803SDavid Howells { 1575b8359153SDavid Howells struct afs_iget_data iget_data; 1576d2ddc776SDavid Howells struct afs_fs_cursor fc; 1577a58823acSDavid Howells struct afs_status_cb *scb; 157843dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1579260a9803SDavid Howells struct key *key; 1580260a9803SDavid Howells int ret; 1581260a9803SDavid Howells 1582d2ddc776SDavid Howells mode |= S_IFREG; 1583260a9803SDavid Howells 15843b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho,", 1585a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1586260a9803SDavid Howells 1587d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1588d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1589d2ddc776SDavid Howells goto error; 1590d2ddc776SDavid Howells 1591260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1592260a9803SDavid Howells if (IS_ERR(key)) { 1593260a9803SDavid Howells ret = PTR_ERR(key); 1594260a9803SDavid Howells goto error; 1595260a9803SDavid Howells } 1596260a9803SDavid Howells 1597a58823acSDavid Howells ret = -ENOMEM; 1598a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1599a58823acSDavid Howells if (!scb) 1600a58823acSDavid Howells goto error_scb; 1601a58823acSDavid Howells 1602d2ddc776SDavid Howells ret = -ERESTARTSYS; 160320b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1604a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1605a58823acSDavid Howells 1606d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 160768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1608b8359153SDavid Howells afs_prep_for_new_inode(&fc, &iget_data); 1609a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1610b8359153SDavid Howells &scb[0], &iget_data.fid, &scb[1]); 1611d2ddc776SDavid Howells } 1612d2ddc776SDavid Howells 1613a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1614a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1615a58823acSDavid Howells &data_version, &scb[0]); 16169dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1617b8359153SDavid Howells afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); 1618d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1619260a9803SDavid Howells if (ret < 0) 1620d2ddc776SDavid Howells goto error_key; 16214433b691SDavid Howells } else { 16224433b691SDavid Howells goto error_key; 1623260a9803SDavid Howells } 1624260a9803SDavid Howells 162563a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1626b8359153SDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, 162763a4681fSDavid Howells afs_edit_dir_for_create); 162863a4681fSDavid Howells 1629a58823acSDavid Howells kfree(scb); 1630260a9803SDavid Howells key_put(key); 1631260a9803SDavid Howells _leave(" = 0"); 1632260a9803SDavid Howells return 0; 1633260a9803SDavid Howells 1634a58823acSDavid Howells error_scb: 1635a58823acSDavid Howells kfree(scb); 1636d2ddc776SDavid Howells error_key: 1637260a9803SDavid Howells key_put(key); 1638260a9803SDavid Howells error: 1639260a9803SDavid Howells d_drop(dentry); 1640260a9803SDavid Howells _leave(" = %d", ret); 1641260a9803SDavid Howells return ret; 1642260a9803SDavid Howells } 1643260a9803SDavid Howells 1644260a9803SDavid Howells /* 1645260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1646260a9803SDavid Howells */ 1647260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1648260a9803SDavid Howells struct dentry *dentry) 1649260a9803SDavid Howells { 1650d2ddc776SDavid Howells struct afs_fs_cursor fc; 1651a58823acSDavid Howells struct afs_status_cb *scb; 1652a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1653a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1654260a9803SDavid Howells struct key *key; 1655260a9803SDavid Howells int ret; 1656260a9803SDavid Howells 16573b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1658260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1659260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1660a455589fSAl Viro dentry); 1661260a9803SDavid Howells 1662d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1663d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1664d2ddc776SDavid Howells goto error; 1665d2ddc776SDavid Howells 1666a58823acSDavid Howells ret = -ENOMEM; 1667a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1668a58823acSDavid Howells if (!scb) 1669a58823acSDavid Howells goto error; 1670a58823acSDavid Howells 1671260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1672260a9803SDavid Howells if (IS_ERR(key)) { 1673260a9803SDavid Howells ret = PTR_ERR(key); 1674a58823acSDavid Howells goto error_scb; 1675260a9803SDavid Howells } 1676260a9803SDavid Howells 1677d2ddc776SDavid Howells ret = -ERESTARTSYS; 167820b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1679a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1680a58823acSDavid Howells 1681d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1682d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1683bc1527dcSDavid Howells goto error_key; 1684d2ddc776SDavid Howells } 1685260a9803SDavid Howells 1686d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 168768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 168868251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 1689a58823acSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, 1690a58823acSDavid Howells &scb[0], &scb[1]); 1691d2ddc776SDavid Howells } 1692d2ddc776SDavid Howells 1693a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1694a58823acSDavid Howells &data_version, &scb[0]); 1695a58823acSDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, 1696a58823acSDavid Howells NULL, &scb[1]); 16977de9c6eeSAl Viro ihold(&vnode->vfs_inode); 16989dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1699260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1700d2ddc776SDavid Howells 1701d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1702d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1703d2ddc776SDavid Howells if (ret < 0) 1704d2ddc776SDavid Howells goto error_key; 17054433b691SDavid Howells } else { 17064433b691SDavid Howells goto error_key; 1707d2ddc776SDavid Howells } 1708d2ddc776SDavid Howells 170963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 171063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 171163a4681fSDavid Howells afs_edit_dir_for_link); 171263a4681fSDavid Howells 1713260a9803SDavid Howells key_put(key); 1714a58823acSDavid Howells kfree(scb); 1715260a9803SDavid Howells _leave(" = 0"); 1716260a9803SDavid Howells return 0; 1717260a9803SDavid Howells 1718d2ddc776SDavid Howells error_key: 1719260a9803SDavid Howells key_put(key); 1720a58823acSDavid Howells error_scb: 1721a58823acSDavid Howells kfree(scb); 1722260a9803SDavid Howells error: 1723260a9803SDavid Howells d_drop(dentry); 1724260a9803SDavid Howells _leave(" = %d", ret); 1725260a9803SDavid Howells return ret; 1726260a9803SDavid Howells } 1727260a9803SDavid Howells 1728260a9803SDavid Howells /* 1729260a9803SDavid Howells * create a symlink in an AFS filesystem 1730260a9803SDavid Howells */ 1731260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1732260a9803SDavid Howells const char *content) 1733260a9803SDavid Howells { 1734b8359153SDavid Howells struct afs_iget_data iget_data; 1735d2ddc776SDavid Howells struct afs_fs_cursor fc; 1736a58823acSDavid Howells struct afs_status_cb *scb; 1737d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1738260a9803SDavid Howells struct key *key; 1739260a9803SDavid Howells int ret; 1740260a9803SDavid Howells 17413b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1742a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1743260a9803SDavid Howells content); 1744260a9803SDavid Howells 1745d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1746d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1747d2ddc776SDavid Howells goto error; 1748d2ddc776SDavid Howells 1749260a9803SDavid Howells ret = -EINVAL; 175045222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1751260a9803SDavid Howells goto error; 1752260a9803SDavid Howells 1753a58823acSDavid Howells ret = -ENOMEM; 1754a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1755a58823acSDavid Howells if (!scb) 1756a58823acSDavid Howells goto error; 1757a58823acSDavid Howells 1758260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1759260a9803SDavid Howells if (IS_ERR(key)) { 1760260a9803SDavid Howells ret = PTR_ERR(key); 1761a58823acSDavid Howells goto error_scb; 1762260a9803SDavid Howells } 1763260a9803SDavid Howells 1764d2ddc776SDavid Howells ret = -ERESTARTSYS; 176520b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1766a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1767a58823acSDavid Howells 1768d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 176968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1770b8359153SDavid Howells afs_prep_for_new_inode(&fc, &iget_data); 1771a58823acSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, content, 1772b8359153SDavid Howells &scb[0], &iget_data.fid, &scb[1]); 1773d2ddc776SDavid Howells } 1774d2ddc776SDavid Howells 1775a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1776a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1777a58823acSDavid Howells &data_version, &scb[0]); 17789dd0b82eSDavid Howells afs_update_dentry_version(&fc, dentry, &scb[0]); 1779b8359153SDavid Howells afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]); 1780d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1781260a9803SDavid Howells if (ret < 0) 1782d2ddc776SDavid Howells goto error_key; 17834433b691SDavid Howells } else { 17844433b691SDavid Howells goto error_key; 1785260a9803SDavid Howells } 1786260a9803SDavid Howells 178763a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1788b8359153SDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid, 178963a4681fSDavid Howells afs_edit_dir_for_symlink); 179063a4681fSDavid Howells 1791260a9803SDavid Howells key_put(key); 1792a58823acSDavid Howells kfree(scb); 1793260a9803SDavid Howells _leave(" = 0"); 1794260a9803SDavid Howells return 0; 1795260a9803SDavid Howells 1796d2ddc776SDavid Howells error_key: 1797260a9803SDavid Howells key_put(key); 1798a58823acSDavid Howells error_scb: 1799a58823acSDavid Howells kfree(scb); 1800260a9803SDavid Howells error: 1801260a9803SDavid Howells d_drop(dentry); 1802260a9803SDavid Howells _leave(" = %d", ret); 1803260a9803SDavid Howells return ret; 1804260a9803SDavid Howells } 1805260a9803SDavid Howells 1806260a9803SDavid Howells /* 1807260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1808260a9803SDavid Howells */ 1809260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 18101cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 18111cd66c93SMiklos Szeredi unsigned int flags) 1812260a9803SDavid Howells { 1813d2ddc776SDavid Howells struct afs_fs_cursor fc; 1814a58823acSDavid Howells struct afs_status_cb *scb; 1815260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 181679ddbfa5SDavid Howells struct dentry *tmp = NULL, *rehash = NULL; 181779ddbfa5SDavid Howells struct inode *new_inode; 1818260a9803SDavid Howells struct key *key; 181963a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1820260a9803SDavid Howells int ret; 1821260a9803SDavid Howells 18221cd66c93SMiklos Szeredi if (flags) 18231cd66c93SMiklos Szeredi return -EINVAL; 18241cd66c93SMiklos Szeredi 182579ddbfa5SDavid Howells /* Don't allow silly-rename files be moved around. */ 182679ddbfa5SDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 182779ddbfa5SDavid Howells return -EINVAL; 182879ddbfa5SDavid Howells 18292b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1830260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1831260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1832260a9803SDavid Howells 18333b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1834260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1835260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1836260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1837a455589fSAl Viro new_dentry); 1838260a9803SDavid Howells 1839a58823acSDavid Howells ret = -ENOMEM; 1840a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1841a58823acSDavid Howells if (!scb) 1842a58823acSDavid Howells goto error; 1843a58823acSDavid Howells 1844260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1845260a9803SDavid Howells if (IS_ERR(key)) { 1846260a9803SDavid Howells ret = PTR_ERR(key); 1847a58823acSDavid Howells goto error_scb; 1848260a9803SDavid Howells } 1849260a9803SDavid Howells 185079ddbfa5SDavid Howells /* For non-directories, check whether the target is busy and if so, 185179ddbfa5SDavid Howells * make a copy of the dentry and then do a silly-rename. If the 185279ddbfa5SDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 185379ddbfa5SDavid Howells * new target. 185479ddbfa5SDavid Howells */ 185579ddbfa5SDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 185679ddbfa5SDavid Howells /* To prevent any new references to the target during the 185779ddbfa5SDavid Howells * rename, we unhash the dentry in advance. 185879ddbfa5SDavid Howells */ 185979ddbfa5SDavid Howells if (!d_unhashed(new_dentry)) { 186079ddbfa5SDavid Howells d_drop(new_dentry); 186179ddbfa5SDavid Howells rehash = new_dentry; 186279ddbfa5SDavid Howells } 186379ddbfa5SDavid Howells 186479ddbfa5SDavid Howells if (d_count(new_dentry) > 2) { 186579ddbfa5SDavid Howells /* copy the target dentry's name */ 186679ddbfa5SDavid Howells ret = -ENOMEM; 186779ddbfa5SDavid Howells tmp = d_alloc(new_dentry->d_parent, 186879ddbfa5SDavid Howells &new_dentry->d_name); 186979ddbfa5SDavid Howells if (!tmp) 187079ddbfa5SDavid Howells goto error_rehash; 187179ddbfa5SDavid Howells 187279ddbfa5SDavid Howells ret = afs_sillyrename(new_dvnode, 187379ddbfa5SDavid Howells AFS_FS_I(d_inode(new_dentry)), 187479ddbfa5SDavid Howells new_dentry, key); 187579ddbfa5SDavid Howells if (ret) 187679ddbfa5SDavid Howells goto error_rehash; 187779ddbfa5SDavid Howells 187879ddbfa5SDavid Howells new_dentry = tmp; 187979ddbfa5SDavid Howells rehash = NULL; 188079ddbfa5SDavid Howells new_negative = true; 188179ddbfa5SDavid Howells } 188279ddbfa5SDavid Howells } 188379ddbfa5SDavid Howells 18849dd0b82eSDavid Howells /* This bit is potentially nasty as there's a potential race with 18859dd0b82eSDavid Howells * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 18869dd0b82eSDavid Howells * to reflect it's new parent's new data_version after the op, but 18879dd0b82eSDavid Howells * d_revalidate may see old_dentry between the op having taken place 18889dd0b82eSDavid Howells * and the version being updated. 18899dd0b82eSDavid Howells * 18909dd0b82eSDavid Howells * So drop the old_dentry for now to make other threads go through 18919dd0b82eSDavid Howells * lookup instead - which we hold a lock against. 18929dd0b82eSDavid Howells */ 18939dd0b82eSDavid Howells d_drop(old_dentry); 18949dd0b82eSDavid Howells 1895d2ddc776SDavid Howells ret = -ERESTARTSYS; 189620b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) { 1897a58823acSDavid Howells afs_dataversion_t orig_data_version; 1898a58823acSDavid Howells afs_dataversion_t new_data_version; 1899a58823acSDavid Howells struct afs_status_cb *new_scb = &scb[1]; 1900a58823acSDavid Howells 1901a58823acSDavid Howells orig_data_version = orig_dvnode->status.data_version + 1; 1902a58823acSDavid Howells 1903d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1904d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1905d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 19069dd0b82eSDavid Howells goto error_rehash_old; 1907d2ddc776SDavid Howells } 190837c0bbb3SDavid Howells new_data_version = new_dvnode->status.data_version + 1; 1909a58823acSDavid Howells } else { 1910a58823acSDavid Howells new_data_version = orig_data_version; 1911a58823acSDavid Howells new_scb = &scb[0]; 1912d2ddc776SDavid Howells } 1913a58823acSDavid Howells 1914d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 191568251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 191668251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1917d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 191863a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 1919a58823acSDavid Howells &scb[0], new_scb); 1920d2ddc776SDavid Howells } 1921d2ddc776SDavid Howells 1922a58823acSDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break, 1923a58823acSDavid Howells &orig_data_version, &scb[0]); 1924a58823acSDavid Howells if (new_dvnode != orig_dvnode) { 1925a58823acSDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2, 1926a58823acSDavid Howells &new_data_version, &scb[1]); 1927d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1928a58823acSDavid Howells } 1929d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1930260a9803SDavid Howells if (ret < 0) 19319dd0b82eSDavid Howells goto error_rehash_old; 1932d2ddc776SDavid Howells } 1933d2ddc776SDavid Howells 193463a4681fSDavid Howells if (ret == 0) { 193579ddbfa5SDavid Howells if (rehash) 193679ddbfa5SDavid Howells d_rehash(rehash); 193763a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 193863a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 193979ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 194063a4681fSDavid Howells 194163a4681fSDavid Howells if (!new_negative && 194263a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 194363a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 194479ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 194563a4681fSDavid Howells 194663a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 194763a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 194879ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 194979ddbfa5SDavid Howells 195079ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 195179ddbfa5SDavid Howells if (new_inode) { 195279ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 195379ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 195479ddbfa5SDavid Howells drop_nlink(new_inode); 195579ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 195679ddbfa5SDavid Howells } 19579dd0b82eSDavid Howells 19589dd0b82eSDavid Howells /* Now we can update d_fsdata on the dentries to reflect their 19599dd0b82eSDavid Howells * new parent's data_version. 19609dd0b82eSDavid Howells * 19619dd0b82eSDavid Howells * Note that if we ever implement RENAME_EXCHANGE, we'll have 19629dd0b82eSDavid Howells * to update both dentries with opposing dir versions. 19639dd0b82eSDavid Howells */ 19649dd0b82eSDavid Howells if (new_dvnode != orig_dvnode) { 19659dd0b82eSDavid Howells afs_update_dentry_version(&fc, old_dentry, &scb[1]); 19669dd0b82eSDavid Howells afs_update_dentry_version(&fc, new_dentry, &scb[1]); 19679dd0b82eSDavid Howells } else { 19689dd0b82eSDavid Howells afs_update_dentry_version(&fc, old_dentry, &scb[0]); 19699dd0b82eSDavid Howells afs_update_dentry_version(&fc, new_dentry, &scb[0]); 19709dd0b82eSDavid Howells } 197179ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 197279ddbfa5SDavid Howells goto error_tmp; 197363a4681fSDavid Howells } 197463a4681fSDavid Howells 19759dd0b82eSDavid Howells error_rehash_old: 19769dd0b82eSDavid Howells d_rehash(new_dentry); 197779ddbfa5SDavid Howells error_rehash: 197879ddbfa5SDavid Howells if (rehash) 197979ddbfa5SDavid Howells d_rehash(rehash); 198079ddbfa5SDavid Howells error_tmp: 198179ddbfa5SDavid Howells if (tmp) 198279ddbfa5SDavid Howells dput(tmp); 1983260a9803SDavid Howells key_put(key); 1984a58823acSDavid Howells error_scb: 1985a58823acSDavid Howells kfree(scb); 1986260a9803SDavid Howells error: 1987260a9803SDavid Howells _leave(" = %d", ret); 1988260a9803SDavid Howells return ret; 1989260a9803SDavid Howells } 1990f3ddee8dSDavid Howells 1991f3ddee8dSDavid Howells /* 1992f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1993f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1994f3ddee8dSDavid Howells */ 1995f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1996f3ddee8dSDavid Howells { 1997f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1998f3ddee8dSDavid Howells 19993b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 2000f3ddee8dSDavid Howells 2001f3ddee8dSDavid Howells set_page_private(page, 0); 2002f3ddee8dSDavid Howells ClearPagePrivate(page); 2003f3ddee8dSDavid Howells 2004f3ddee8dSDavid Howells /* The directory will need reloading. */ 2005f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2006f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 2007f3ddee8dSDavid Howells return 1; 2008f3ddee8dSDavid Howells } 2009f3ddee8dSDavid Howells 2010f3ddee8dSDavid Howells /* 2011f3ddee8dSDavid Howells * invalidate part or all of a page 2012f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 2013f3ddee8dSDavid Howells * the entire page) 2014f3ddee8dSDavid Howells */ 2015f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 2016f3ddee8dSDavid Howells unsigned int length) 2017f3ddee8dSDavid Howells { 2018f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 2019f3ddee8dSDavid Howells 2020f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 2021f3ddee8dSDavid Howells 2022f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 2023f3ddee8dSDavid Howells 2024f3ddee8dSDavid Howells /* The directory will need reloading. */ 2025f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2026f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 2027f3ddee8dSDavid Howells 2028f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 2029f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 2030f3ddee8dSDavid Howells set_page_private(page, 0); 2031f3ddee8dSDavid Howells ClearPagePrivate(page); 2032f3ddee8dSDavid Howells } 2033f3ddee8dSDavid Howells } 2034