11da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 21da177e4SLinus Torvalds * 3f3ddee8dSDavid Howells * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/fs.h> 1434286d66SNick Piggin #include <linux/namei.h> 151da177e4SLinus Torvalds #include <linux/pagemap.h> 16f3ddee8dSDavid Howells #include <linux/swap.h> 1700d3b7a4SDavid Howells #include <linux/ctype.h> 18e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 19f3ddee8dSDavid Howells #include <linux/task_io_accounting_ops.h> 201da177e4SLinus Torvalds #include "internal.h" 21a58823acSDavid Howells #include "afs_fs.h" 224ea219a8SDavid Howells #include "xdr_fs.h" 231da177e4SLinus Torvalds 24260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2500cd8dd3SAl Viro unsigned int flags); 261da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 271bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 280b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 29fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 3079ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode); 315cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 325cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 33ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 34afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 354acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 36ebfc3b49SAl Viro bool excl); 3718bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 38260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 39260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 40260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 41260a9803SDavid Howells struct dentry *dentry); 42260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 43260a9803SDavid Howells const char *content); 44260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 451cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 461cd66c93SMiklos Szeredi unsigned int flags); 47f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 48f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 49f3ddee8dSDavid Howells unsigned int length); 50f3ddee8dSDavid Howells 51f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 52f3ddee8dSDavid Howells { 53f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 54f3ddee8dSDavid Howells } 551da177e4SLinus Torvalds 564b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 571da177e4SLinus Torvalds .open = afs_dir_open, 5800d3b7a4SDavid Howells .release = afs_release, 5929884effSAl Viro .iterate_shared = afs_readdir, 60e8d6c554SDavid Howells .lock = afs_lock, 613222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 64754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 65260a9803SDavid Howells .create = afs_create, 66260a9803SDavid Howells .lookup = afs_lookup, 67260a9803SDavid Howells .link = afs_link, 68260a9803SDavid Howells .unlink = afs_unlink, 69260a9803SDavid Howells .symlink = afs_symlink, 70260a9803SDavid Howells .mkdir = afs_mkdir, 71260a9803SDavid Howells .rmdir = afs_rmdir, 722773bf00SMiklos Szeredi .rename = afs_rename, 7300d3b7a4SDavid Howells .permission = afs_permission, 74416351f2SDavid Howells .getattr = afs_getattr, 7531143d5dSDavid Howells .setattr = afs_setattr, 76d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 771da177e4SLinus Torvalds }; 781da177e4SLinus Torvalds 79f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 80f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 81f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 82f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 83f3ddee8dSDavid Howells }; 84f3ddee8dSDavid Howells 85d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 861da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 871da177e4SLinus Torvalds .d_delete = afs_d_delete, 88260a9803SDavid Howells .d_release = afs_d_release, 89d18610b0SDavid Howells .d_automount = afs_d_automount, 9079ddbfa5SDavid Howells .d_iput = afs_d_iput, 911da177e4SLinus Torvalds }; 921da177e4SLinus Torvalds 935cf9dd55SDavid Howells struct afs_lookup_one_cookie { 945cf9dd55SDavid Howells struct dir_context ctx; 955cf9dd55SDavid Howells struct qstr name; 965cf9dd55SDavid Howells bool found; 975cf9dd55SDavid Howells struct afs_fid fid; 985cf9dd55SDavid Howells }; 995cf9dd55SDavid Howells 100260a9803SDavid Howells struct afs_lookup_cookie { 1011bbae9f8SAl Viro struct dir_context ctx; 1021bbae9f8SAl Viro struct qstr name; 1035cf9dd55SDavid Howells bool found; 1045cf9dd55SDavid Howells bool one_only; 1055cf9dd55SDavid Howells unsigned short nr_fids; 10687182759SDavid Howells struct afs_status_cb *statuses; 1075cf9dd55SDavid Howells struct afs_fid fids[50]; 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * check that a directory page is valid 1121da177e4SLinus Torvalds */ 113f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 114f3ddee8dSDavid Howells loff_t i_size) 1151da177e4SLinus Torvalds { 11600317636SDavid Howells struct afs_xdr_dir_page *dbuf; 117f3ddee8dSDavid Howells loff_t latter, off; 1181da177e4SLinus Torvalds int tmp, qty; 1191da177e4SLinus Torvalds 120dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 121dab17c1aSDavid Howells * we must take care because the directory may change size under us. 122dab17c1aSDavid Howells */ 123dab17c1aSDavid Howells off = page_offset(page); 124dab17c1aSDavid Howells if (i_size <= off) 125dab17c1aSDavid Howells goto checked; 126dab17c1aSDavid Howells 127dab17c1aSDavid Howells latter = i_size - off; 1281da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1291da177e4SLinus Torvalds qty = PAGE_SIZE; 1301da177e4SLinus Torvalds else 1311da177e4SLinus Torvalds qty = latter; 13200317636SDavid Howells qty /= sizeof(union afs_xdr_dir_block); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* check them */ 13563a4681fSDavid Howells dbuf = kmap(page); 1361da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 13700317636SDavid Howells if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 138dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 139f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 14000317636SDavid Howells ntohs(dbuf->blocks[tmp].hdr.magic)); 141f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 14263a4681fSDavid Howells kunmap(page); 143f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1441da177e4SLinus Torvalds goto error; 1451da177e4SLinus Torvalds } 14663a4681fSDavid Howells 14763a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 14863a4681fSDavid Howells * use string functions on it. The filenames in the page 14963a4681fSDavid Howells * *should* be NUL-terminated anyway. 15063a4681fSDavid Howells */ 15163a4681fSDavid Howells ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 15463a4681fSDavid Howells kunmap(page); 15563a4681fSDavid Howells 156dab17c1aSDavid Howells checked: 157f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 158be5b82dbSAl Viro return true; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds error: 161be5b82dbSAl Viro return false; 162ec26815aSDavid Howells } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* 165445b1028SDavid Howells * Check the contents of a directory that we've just read. 166445b1028SDavid Howells */ 167445b1028SDavid Howells static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) 168445b1028SDavid Howells { 169445b1028SDavid Howells struct afs_xdr_dir_page *dbuf; 170445b1028SDavid Howells unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); 171445b1028SDavid Howells 172445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) 173445b1028SDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) 174445b1028SDavid Howells goto bad; 175445b1028SDavid Howells return true; 176445b1028SDavid Howells 177445b1028SDavid Howells bad: 178445b1028SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", 179445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 180445b1028SDavid Howells req->file_size, req->len, req->actual_len, req->remain); 181445b1028SDavid Howells pr_warn("DIR %llx %x %x %x\n", 182445b1028SDavid Howells req->pos, req->index, req->nr_pages, req->offset); 183445b1028SDavid Howells 184445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) { 185445b1028SDavid Howells dbuf = kmap(req->pages[i]); 186445b1028SDavid Howells for (j = 0; j < qty; j++) { 187445b1028SDavid Howells union afs_xdr_dir_block *block = &dbuf->blocks[j]; 188445b1028SDavid Howells 189445b1028SDavid Howells pr_warn("[%02x] %32phN\n", i * qty + j, block); 190445b1028SDavid Howells } 191445b1028SDavid Howells kunmap(req->pages[i]); 192445b1028SDavid Howells } 193445b1028SDavid Howells return false; 194445b1028SDavid Howells } 195445b1028SDavid Howells 196445b1028SDavid Howells /* 1971da177e4SLinus Torvalds * open an AFS directory file 1981da177e4SLinus Torvalds */ 1991da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2001da177e4SLinus Torvalds { 2011da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2021da177e4SLinus Torvalds 20300317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 20400317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2051da177e4SLinus Torvalds 20608e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2071da177e4SLinus Torvalds return -ENOENT; 2081da177e4SLinus Torvalds 20900d3b7a4SDavid Howells return afs_open(inode, file); 210ec26815aSDavid Howells } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* 213f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 214f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 215f3ddee8dSDavid Howells * get reclaimed during the iteration. 216f3ddee8dSDavid Howells */ 217f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 218b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 219f3ddee8dSDavid Howells { 220f3ddee8dSDavid Howells struct afs_read *req; 221f3ddee8dSDavid Howells loff_t i_size; 222f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 223f3ddee8dSDavid Howells int ret = -ENOMEM; 224f3ddee8dSDavid Howells 225f3ddee8dSDavid Howells retry: 226f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 227f3ddee8dSDavid Howells if (i_size < 2048) 228f51375cdSDavid Howells return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); 229f51375cdSDavid Howells if (i_size > 2048 * 1024) { 230f51375cdSDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 231f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 232f51375cdSDavid Howells } 233f3ddee8dSDavid Howells 234f3ddee8dSDavid Howells _enter("%llu", i_size); 235f3ddee8dSDavid Howells 236f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 237f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 238f3ddee8dSDavid Howells */ 239f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 240f3ddee8dSDavid Howells nr_inline = nr_pages; 241f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 242f3ddee8dSDavid Howells nr_inline = 0; 243f3ddee8dSDavid Howells 244f3ddee8dSDavid Howells req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, 245f3ddee8dSDavid Howells GFP_KERNEL); 246f3ddee8dSDavid Howells if (!req) 247f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 248f3ddee8dSDavid Howells 249f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 250f3ddee8dSDavid Howells req->nr_pages = nr_pages; 251f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 252f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 253f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 254f3ddee8dSDavid Howells if (nr_inline > 0) { 255f3ddee8dSDavid Howells req->pages = req->array; 256f3ddee8dSDavid Howells } else { 257f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 258f3ddee8dSDavid Howells GFP_KERNEL); 259f3ddee8dSDavid Howells if (!req->pages) 260f3ddee8dSDavid Howells goto error; 261f3ddee8dSDavid Howells } 262f3ddee8dSDavid Howells 263f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 264f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 265f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 266f3ddee8dSDavid Howells * need to reread the entire directory contents. 267f3ddee8dSDavid Howells */ 268f3ddee8dSDavid Howells i = 0; 269f3ddee8dSDavid Howells do { 270f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 271f3ddee8dSDavid Howells req->nr_pages - i, 272f3ddee8dSDavid Howells req->pages + i); 273f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 274f3ddee8dSDavid Howells if (n == 0) { 275f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 276f3ddee8dSDavid Howells 277f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 278f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 279f3ddee8dSDavid Howells 280f3ddee8dSDavid Howells ret = -ENOMEM; 281f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 282f3ddee8dSDavid Howells if (!req->pages[i]) 283f3ddee8dSDavid Howells goto error; 284f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 285f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 286f3ddee8dSDavid Howells i, gfp); 287f3ddee8dSDavid Howells if (ret < 0) 288f3ddee8dSDavid Howells goto error; 289f3ddee8dSDavid Howells 290f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 291f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 292f3ddee8dSDavid Howells unlock_page(req->pages[i]); 293f3ddee8dSDavid Howells i++; 294f3ddee8dSDavid Howells } else { 295f3ddee8dSDavid Howells i += n; 296f3ddee8dSDavid Howells } 297f3ddee8dSDavid Howells } while (i < req->nr_pages); 298f3ddee8dSDavid Howells 299f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 300f3ddee8dSDavid Howells * races. 301f3ddee8dSDavid Howells */ 302f3ddee8dSDavid Howells ret = -ERESTARTSYS; 303b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 304b61f7dcfSDavid Howells goto error; 305f3ddee8dSDavid Howells 306f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 307f3ddee8dSDavid Howells goto success; 308f3ddee8dSDavid Howells 309b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 310b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 311b61f7dcfSDavid Howells goto error; 312b61f7dcfSDavid Howells 313b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 31499987c56SDavid Howells trace_afs_reload_dir(dvnode); 315f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 316f3ddee8dSDavid Howells if (ret < 0) 317b61f7dcfSDavid Howells goto error_unlock; 318f3ddee8dSDavid Howells 319f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 320f3ddee8dSDavid Howells 321f3ddee8dSDavid Howells if (req->len < req->file_size) 322f3ddee8dSDavid Howells goto content_has_grown; 323f3ddee8dSDavid Howells 324f3ddee8dSDavid Howells /* Validate the data we just read. */ 325f3ddee8dSDavid Howells ret = -EIO; 326445b1028SDavid Howells if (!afs_dir_check_pages(dvnode, req)) 327b61f7dcfSDavid Howells goto error_unlock; 328f3ddee8dSDavid Howells 329f3ddee8dSDavid Howells // TODO: Trim excess pages 330f3ddee8dSDavid Howells 331f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 332f3ddee8dSDavid Howells } 333f3ddee8dSDavid Howells 334b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 335f3ddee8dSDavid Howells success: 336f3ddee8dSDavid Howells return req; 337f3ddee8dSDavid Howells 338f3ddee8dSDavid Howells error_unlock: 339b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 340f3ddee8dSDavid Howells error: 341f3ddee8dSDavid Howells afs_put_read(req); 342f3ddee8dSDavid Howells _leave(" = %d", ret); 343f3ddee8dSDavid Howells return ERR_PTR(ret); 344f3ddee8dSDavid Howells 345f3ddee8dSDavid Howells content_has_grown: 346b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 347f3ddee8dSDavid Howells afs_put_read(req); 348f3ddee8dSDavid Howells goto retry; 349f3ddee8dSDavid Howells } 350f3ddee8dSDavid Howells 351f3ddee8dSDavid Howells /* 3521da177e4SLinus Torvalds * deal with one block in an AFS directory 3531da177e4SLinus Torvalds */ 354f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 355f51375cdSDavid Howells struct dir_context *ctx, 35600317636SDavid Howells union afs_xdr_dir_block *block, 3571bbae9f8SAl Viro unsigned blkoff) 3581da177e4SLinus Torvalds { 35900317636SDavid Howells union afs_xdr_dirent *dire; 3601da177e4SLinus Torvalds unsigned offset, next, curr; 3611da177e4SLinus Torvalds size_t nlen; 3621bbae9f8SAl Viro int tmp; 3631da177e4SLinus Torvalds 3641bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3651da177e4SLinus Torvalds 36600317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3694ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3704ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3711da177e4SLinus Torvalds offset = next 3721da177e4SLinus Torvalds ) { 3731da177e4SLinus Torvalds next = offset + 1; 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 37600317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3771da177e4SLinus Torvalds (1 << (offset % 8)))) { 3785b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 37900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3801da177e4SLinus Torvalds if (offset >= curr) 3811bbae9f8SAl Viro ctx->pos = blkoff + 38200317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3831da177e4SLinus Torvalds continue; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* got a valid entry */ 3871da177e4SLinus Torvalds dire = &block->dirents[offset]; 3881da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3891da177e4SLinus Torvalds sizeof(*block) - 39000317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3911da177e4SLinus Torvalds 3925b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 39300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3941da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3951da177e4SLinus Torvalds nlen, dire->u.name); 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds /* work out where the next possible entry is */ 39800317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3994ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 4005b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4011da177e4SLinus Torvalds " %u travelled beyond end dir block" 4025b5e0928SAlexey Dobriyan " (len %u/%zu)", 40300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4041da177e4SLinus Torvalds offset, next, tmp, nlen); 405f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4061da177e4SLinus Torvalds } 40700317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 4081da177e4SLinus Torvalds (1 << (next % 8)))) { 4095b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4105b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 41100317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4121da177e4SLinus Torvalds offset, next, tmp, nlen); 413f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4165b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 41700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4181da177e4SLinus Torvalds next, tmp, nlen); 4191da177e4SLinus Torvalds next++; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* skip if starts before the current position */ 4231da177e4SLinus Torvalds if (offset < curr) 4241da177e4SLinus Torvalds continue; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /* found the next entry */ 4271bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4281da177e4SLinus Torvalds ntohl(dire->u.vnode), 4295cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4305cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4311bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4321da177e4SLinus Torvalds _leave(" = 0 [full]"); 4331da177e4SLinus Torvalds return 0; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 43600317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds _leave(" = 1 [more]"); 4401da177e4SLinus Torvalds return 1; 441ec26815aSDavid Howells } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 44408e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4451da177e4SLinus Torvalds */ 4461bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4471bbae9f8SAl Viro struct key *key) 4481da177e4SLinus Torvalds { 449f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 45000317636SDavid Howells struct afs_xdr_dir_page *dbuf; 45100317636SDavid Howells union afs_xdr_dir_block *dblock; 452f3ddee8dSDavid Howells struct afs_read *req; 4531da177e4SLinus Torvalds struct page *page; 4541da177e4SLinus Torvalds unsigned blkoff, limit; 4551da177e4SLinus Torvalds int ret; 4561da177e4SLinus Torvalds 4571bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4581da177e4SLinus Torvalds 45908e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4601da177e4SLinus Torvalds _leave(" = -ESTALE"); 4611da177e4SLinus Torvalds return -ESTALE; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 464f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 465f3ddee8dSDavid Howells if (IS_ERR(req)) 466f3ddee8dSDavid Howells return PTR_ERR(req); 467f3ddee8dSDavid Howells 4681da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 46900317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 47000317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4731da177e4SLinus Torvalds ret = 0; 474f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 47500317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4761da177e4SLinus Torvalds 477f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 478f3ddee8dSDavid Howells * to the LRU. 479f3ddee8dSDavid Howells */ 480f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 481f3ddee8dSDavid Howells if (!page) { 482f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 4831da177e4SLinus Torvalds break; 4841da177e4SLinus Torvalds } 485f3ddee8dSDavid Howells mark_page_accessed(page); 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4881da177e4SLinus Torvalds 489f3ddee8dSDavid Howells dbuf = kmap(page); 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4921da177e4SLinus Torvalds do { 4931da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 49400317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 495f51375cdSDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); 4961da177e4SLinus Torvalds if (ret != 1) { 497f3ddee8dSDavid Howells kunmap(page); 4981da177e4SLinus Torvalds goto out; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 50100317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 5021da177e4SLinus Torvalds 5031bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 5041da177e4SLinus Torvalds 505f3ddee8dSDavid Howells kunmap(page); 5061da177e4SLinus Torvalds ret = 0; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds out: 510b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 511f3ddee8dSDavid Howells afs_put_read(req); 5121da177e4SLinus Torvalds _leave(" = %d", ret); 5131da177e4SLinus Torvalds return ret; 514ec26815aSDavid Howells } 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* 5171da177e4SLinus Torvalds * read an AFS directory 5181da177e4SLinus Torvalds */ 5191bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5201da177e4SLinus Torvalds { 521215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 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, 56200d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 5631da177e4SLinus Torvalds { 5641bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5655cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5665cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5671bbae9f8SAl Viro .name = dentry->d_name, 5681bbae9f8SAl Viro .fid.vid = as->volume->vid 5691bbae9f8SAl Viro }; 5701da177e4SLinus Torvalds int ret; 5711da177e4SLinus Torvalds 572a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* search the directory */ 5751bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 5761da177e4SLinus Torvalds if (ret < 0) { 57708e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 57808e0e7c8SDavid Howells return ret; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds ret = -ENOENT; 5821da177e4SLinus Torvalds if (!cookie.found) { 58308e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58408e0e7c8SDavid Howells return -ENOENT; 58508e0e7c8SDavid Howells } 58608e0e7c8SDavid Howells 58708e0e7c8SDavid Howells *fid = cookie.fid; 5883b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 58908e0e7c8SDavid Howells return 0; 59008e0e7c8SDavid Howells } 59108e0e7c8SDavid Howells 59208e0e7c8SDavid Howells /* 5935cf9dd55SDavid Howells * search the directory for a name 5945cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5955cf9dd55SDavid Howells * uniquifier through dtype 5965cf9dd55SDavid Howells */ 5975cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5985cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5995cf9dd55SDavid Howells { 6005cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6015cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6025cf9dd55SDavid Howells int ret; 6035cf9dd55SDavid Howells 6045cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6055cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6065cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6075cf9dd55SDavid Howells 6085cf9dd55SDavid Howells /* insanity checks first */ 60900317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 61000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6115cf9dd55SDavid Howells 6125cf9dd55SDavid Howells if (cookie->found) { 6135cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6145cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6155cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6165cf9dd55SDavid Howells cookie->nr_fids++; 6175cf9dd55SDavid Howells } 6185cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6195cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 6205cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 6215cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 6225cf9dd55SDavid Howells cookie->found = 1; 6235cf9dd55SDavid Howells if (cookie->one_only) 6245cf9dd55SDavid Howells return -1; 6255cf9dd55SDavid Howells } 6265cf9dd55SDavid Howells 6275cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6285cf9dd55SDavid Howells _leave(" = %d", ret); 6295cf9dd55SDavid Howells return ret; 6305cf9dd55SDavid Howells } 6315cf9dd55SDavid Howells 6325cf9dd55SDavid Howells /* 6335cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 6345cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 6355cf9dd55SDavid Howells * asked for is returned. 6365cf9dd55SDavid Howells */ 6375cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6385cf9dd55SDavid Howells struct key *key) 6395cf9dd55SDavid Howells { 6405cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 6415cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 6425cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 64387182759SDavid Howells struct afs_status_cb *scb; 6445cf9dd55SDavid Howells struct afs_iget_data data; 6455cf9dd55SDavid Howells struct afs_fs_cursor fc; 6465cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 6475cf9dd55SDavid Howells struct inode *inode = NULL; 6485cf9dd55SDavid Howells int ret, i; 6495cf9dd55SDavid Howells 6505cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6515cf9dd55SDavid Howells 6525cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6535cf9dd55SDavid Howells if (!cookie) 6545cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6555cf9dd55SDavid Howells 6565cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6575cf9dd55SDavid Howells cookie->name = dentry->d_name; 6585cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6595cf9dd55SDavid Howells 6605cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 6615cf9dd55SDavid Howells if (dvnode->cb_interest && 6625cf9dd55SDavid Howells dvnode->cb_interest->server && 6635cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 6645cf9dd55SDavid Howells cookie->one_only = true; 6655cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6665cf9dd55SDavid Howells 6675cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6685cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6695cf9dd55SDavid Howells 6705cf9dd55SDavid Howells /* search the directory */ 6715cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 6725cf9dd55SDavid Howells if (ret < 0) { 6735cf9dd55SDavid Howells inode = ERR_PTR(ret); 6745cf9dd55SDavid Howells goto out; 6755cf9dd55SDavid Howells } 6765cf9dd55SDavid Howells 6775cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6785cf9dd55SDavid Howells if (!cookie->found) 6795cf9dd55SDavid Howells goto out; 6805cf9dd55SDavid Howells 6815cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 6825cf9dd55SDavid Howells data.volume = dvnode->volume; 6835cf9dd55SDavid Howells data.fid = cookie->fids[0]; 6845cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 6855cf9dd55SDavid Howells if (inode) 6865cf9dd55SDavid Howells goto out; 6875cf9dd55SDavid Howells 6885cf9dd55SDavid Howells /* Need space for examining all the selected files */ 6895cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 69087182759SDavid Howells cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb), 6915cf9dd55SDavid Howells GFP_KERNEL); 6925cf9dd55SDavid Howells if (!cookie->statuses) 6935cf9dd55SDavid Howells goto out; 6945cf9dd55SDavid Howells 6955cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 6965cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 6975cf9dd55SDavid Howells * the whole operation. 6985cf9dd55SDavid Howells */ 6995cf9dd55SDavid Howells if (cookie->one_only) 7005cf9dd55SDavid Howells goto no_inline_bulk_status; 7015cf9dd55SDavid Howells 7025cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 70320b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7045cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7055cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 7065cf9dd55SDavid Howells &fc.cbi->server->flags)) { 7075cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 7085cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 7095cf9dd55SDavid Howells break; 7105cf9dd55SDavid Howells } 7115cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 7125cf9dd55SDavid Howells afs_v2net(dvnode), 7135cf9dd55SDavid Howells cookie->fids, 7145cf9dd55SDavid Howells cookie->statuses, 7155cf9dd55SDavid Howells cookie->nr_fids, NULL); 7165cf9dd55SDavid Howells } 7175cf9dd55SDavid Howells 7185cf9dd55SDavid Howells if (fc.ac.error == 0) 7195cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7205cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 7215cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 7225cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7235cf9dd55SDavid Howells } 7245cf9dd55SDavid Howells 7255cf9dd55SDavid Howells if (!IS_ERR(inode)) 7265cf9dd55SDavid Howells goto success; 7275cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 7285cf9dd55SDavid Howells goto out_c; 7295cf9dd55SDavid Howells 7305cf9dd55SDavid Howells no_inline_bulk_status: 7315cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7325cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7335cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7345cf9dd55SDavid Howells */ 7355cf9dd55SDavid Howells cookie->nr_fids = 1; 7365cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 73720b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7385cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 73987182759SDavid Howells scb = &cookie->statuses[0]; 7405cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7415cf9dd55SDavid Howells afs_v2net(dvnode), 7425cf9dd55SDavid Howells cookie->fids, 743a58823acSDavid Howells scb, 7445cf9dd55SDavid Howells NULL); 7455cf9dd55SDavid Howells } 7465cf9dd55SDavid Howells 7475cf9dd55SDavid Howells if (fc.ac.error == 0) 7485cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7495cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7505cf9dd55SDavid Howells } 7515cf9dd55SDavid Howells 7525cf9dd55SDavid Howells if (IS_ERR(inode)) 7535cf9dd55SDavid Howells goto out_c; 7545cf9dd55SDavid Howells 7555cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 75687182759SDavid Howells cookie->statuses[i].status.abort_code = 0; 7575cf9dd55SDavid Howells 7585cf9dd55SDavid Howells success: 7595cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7605cf9dd55SDavid Howells * one we actually want. 7615cf9dd55SDavid Howells */ 76287182759SDavid Howells scb = &cookie->statuses[0]; 76387182759SDavid Howells if (scb->status.abort_code != 0) 76487182759SDavid Howells inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code)); 7655cf9dd55SDavid Howells 7665cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 76787182759SDavid Howells struct afs_status_cb *scb = &cookie->statuses[i]; 7685cf9dd55SDavid Howells struct inode *ti; 7695cf9dd55SDavid Howells 77087182759SDavid Howells if (scb->status.abort_code != 0) 7715cf9dd55SDavid Howells continue; 7725cf9dd55SDavid Howells 7735cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 774a58823acSDavid Howells scb, cbi, dvnode); 7755cf9dd55SDavid Howells if (i == 0) { 7765cf9dd55SDavid Howells inode = ti; 7775cf9dd55SDavid Howells } else { 7785cf9dd55SDavid Howells if (!IS_ERR(ti)) 7795cf9dd55SDavid Howells iput(ti); 7805cf9dd55SDavid Howells } 7815cf9dd55SDavid Howells } 7825cf9dd55SDavid Howells 7835cf9dd55SDavid Howells out_c: 7845cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 78587182759SDavid Howells kvfree(cookie->statuses); 7865cf9dd55SDavid Howells out: 7875cf9dd55SDavid Howells kfree(cookie); 7885cf9dd55SDavid Howells return inode; 7895cf9dd55SDavid Howells } 7905cf9dd55SDavid Howells 7915cf9dd55SDavid Howells /* 7926f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 7936f8880d8SDavid Howells */ 7946f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 7956f8880d8SDavid Howells struct key *key) 7966f8880d8SDavid Howells { 7976f8880d8SDavid Howells struct afs_sysnames *subs; 7986f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 7996f8880d8SDavid Howells struct dentry *ret; 8006f8880d8SDavid Howells char *buf, *p, *name; 8016f8880d8SDavid Howells int len, i; 8026f8880d8SDavid Howells 8036f8880d8SDavid Howells _enter(""); 8046f8880d8SDavid Howells 8056f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8066f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8076f8880d8SDavid Howells if (!buf) 8086f8880d8SDavid Howells goto out_p; 8096f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8106f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8116f8880d8SDavid Howells p += dentry->d_name.len - 4; 8126f8880d8SDavid Howells } 8136f8880d8SDavid Howells 8146f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8156f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8166f8880d8SDavid Howells subs = net->sysnames; 8176f8880d8SDavid Howells refcount_inc(&subs->usage); 8186f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8196f8880d8SDavid Howells 8206f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8216f8880d8SDavid Howells name = subs->subs[i]; 8226f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8236f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8246f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8256f8880d8SDavid Howells goto out_s; 8266f8880d8SDavid Howells } 8276f8880d8SDavid Howells 8286f8880d8SDavid Howells strcpy(p, name); 8296f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8306f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8316f8880d8SDavid Howells goto out_s; 8326f8880d8SDavid Howells dput(ret); 8336f8880d8SDavid Howells } 8346f8880d8SDavid Howells 8356f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8366f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8376f8880d8SDavid Howells */ 8386f8880d8SDavid Howells ret = NULL; 8396f8880d8SDavid Howells out_s: 8406f8880d8SDavid Howells afs_put_sysnames(subs); 8416f8880d8SDavid Howells kfree(buf); 8426f8880d8SDavid Howells out_p: 8436f8880d8SDavid Howells key_put(key); 8446f8880d8SDavid Howells return ret; 8456f8880d8SDavid Howells } 8466f8880d8SDavid Howells 8476f8880d8SDavid Howells /* 84808e0e7c8SDavid Howells * look up an entry in a directory 84908e0e7c8SDavid Howells */ 850260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 85100cd8dd3SAl Viro unsigned int flags) 85208e0e7c8SDavid Howells { 8535cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 85408e0e7c8SDavid Howells struct inode *inode; 85534b2a88fSAl Viro struct dentry *d; 85600d3b7a4SDavid Howells struct key *key; 85708e0e7c8SDavid Howells int ret; 85808e0e7c8SDavid Howells 8593b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 8605cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 861260a9803SDavid Howells 8622b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 86308e0e7c8SDavid Howells 86445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 86508e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 86608e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 86708e0e7c8SDavid Howells } 86808e0e7c8SDavid Howells 8695cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 87008e0e7c8SDavid Howells _leave(" = -ESTALE"); 87108e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 87208e0e7c8SDavid Howells } 87308e0e7c8SDavid Howells 8745cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 87500d3b7a4SDavid Howells if (IS_ERR(key)) { 87600d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 877e231c2eeSDavid Howells return ERR_CAST(key); 87800d3b7a4SDavid Howells } 87900d3b7a4SDavid Howells 8805cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 88108e0e7c8SDavid Howells if (ret < 0) { 88200d3b7a4SDavid Howells key_put(key); 883260a9803SDavid Howells _leave(" = %d [val]", ret); 8841da177e4SLinus Torvalds return ERR_PTR(ret); 8851da177e4SLinus Torvalds } 8861da177e4SLinus Torvalds 8876f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8886f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8896f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 8906f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 8916f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 8926f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 8936f8880d8SDavid Howells 894d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 8955cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 89634b2a88fSAl Viro key_put(key); 89734b2a88fSAl Viro if (inode == ERR_PTR(-ENOENT)) { 8985cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 89934b2a88fSAl Viro } else { 90034b2a88fSAl Viro dentry->d_fsdata = 90134b2a88fSAl Viro (void *)(unsigned long)dvnode->status.data_version; 902bec5eb61Swanglei } 90334b2a88fSAl Viro d = d_splice_alias(inode, dentry); 90480548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 90534b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 90680548b03SDavid Howells trace_afs_lookup(dvnode, &d->d_name, 90780548b03SDavid Howells inode ? AFS_FS_I(inode) : NULL); 90880548b03SDavid Howells } else { 90980548b03SDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, 91080548b03SDavid Howells inode ? AFS_FS_I(inode) : NULL); 91180548b03SDavid Howells } 91234b2a88fSAl Viro return d; 913ec26815aSDavid Howells } 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds /* 9161da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 9171da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 9181da177e4SLinus Torvalds * inode 9191da177e4SLinus Torvalds */ 9200b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 9211da177e4SLinus Torvalds { 922260a9803SDavid Howells struct afs_vnode *vnode, *dir; 923dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 9241da177e4SLinus Torvalds struct dentry *parent; 925c435ee34SDavid Howells struct inode *inode; 92600d3b7a4SDavid Howells struct key *key; 927a4ff7401SDavid Howells long dir_version, de_version; 9281da177e4SLinus Torvalds int ret; 9291da177e4SLinus Torvalds 9300b728e19SAl Viro if (flags & LOOKUP_RCU) 93134286d66SNick Piggin return -ECHILD; 93234286d66SNick Piggin 933c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9342b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 9353b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 936a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 937260a9803SDavid Howells vnode->flags); 938c435ee34SDavid Howells } else { 939a455589fSAl Viro _enter("{neg n=%pd}", dentry); 940c435ee34SDavid Howells } 9411da177e4SLinus Torvalds 942260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 94300d3b7a4SDavid Howells if (IS_ERR(key)) 94400d3b7a4SDavid Howells key = NULL; 94500d3b7a4SDavid Howells 946c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 947c435ee34SDavid Howells inode = d_inode(dentry); 948c435ee34SDavid Howells if (inode) { 949c435ee34SDavid Howells vnode = AFS_FS_I(inode); 950c435ee34SDavid Howells afs_validate(vnode, key); 951c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 952c435ee34SDavid Howells goto out_bad; 953c435ee34SDavid Howells } 954c435ee34SDavid Howells } 955c435ee34SDavid Howells 9561da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 95708e0e7c8SDavid Howells parent = dget_parent(dentry); 9582b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9591da177e4SLinus Torvalds 960260a9803SDavid Howells /* validate the parent directory */ 961260a9803SDavid Howells afs_validate(dir, key); 962260a9803SDavid Howells 963260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 964a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 965c435ee34SDavid Howells goto out_bad_parent; 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 968a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 969a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 970a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 971a4ff7401SDavid Howells * version. 972a4ff7401SDavid Howells */ 973a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 974a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 975a4ff7401SDavid Howells if (de_version == dir_version) 976a4ff7401SDavid Howells goto out_valid; 977a4ff7401SDavid Howells 978a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 979a4ff7401SDavid Howells if (de_version - dir_version >= 0) 980a4ff7401SDavid Howells goto out_valid; 981260a9803SDavid Howells 98208e0e7c8SDavid Howells _debug("dir modified"); 983d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds /* search the directory for this vnode */ 9865cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 987260a9803SDavid Howells switch (ret) { 988260a9803SDavid Howells case 0: 989260a9803SDavid Howells /* the filename maps to something */ 9902b0143b5SDavid Howells if (d_really_is_negative(dentry)) 991c435ee34SDavid Howells goto out_bad_parent; 992c435ee34SDavid Howells inode = d_inode(dentry); 993c435ee34SDavid Howells if (is_bad_inode(inode)) { 994a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 995a455589fSAl Viro dentry); 996c435ee34SDavid Howells goto out_bad_parent; 9971da177e4SLinus Torvalds } 9981da177e4SLinus Torvalds 999c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1000c435ee34SDavid Howells 10011da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 10021da177e4SLinus Torvalds * different file */ 100308e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 10043b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1005a455589fSAl Viro dentry, fid.vnode, 100608e0e7c8SDavid Howells vnode->fid.vnode); 10071da177e4SLinus Torvalds goto not_found; 10081da177e4SLinus Torvalds } 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1011260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1012260a9803SDavid Howells * been reused */ 101308e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1014a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1015a455589fSAl Viro dentry, fid.unique, 10167a224228SJean Noel Cordenner vnode->fid.unique, 1017c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1018c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 101908e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1020c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1021260a9803SDavid Howells goto not_found; 1022260a9803SDavid Howells } 1023260a9803SDavid Howells goto out_valid; 1024260a9803SDavid Howells 1025260a9803SDavid Howells case -ENOENT: 1026260a9803SDavid Howells /* the filename is unknown */ 1027a455589fSAl Viro _debug("%pd: dirent not found", dentry); 10282b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1029260a9803SDavid Howells goto not_found; 1030260a9803SDavid Howells goto out_valid; 1031260a9803SDavid Howells 1032260a9803SDavid Howells default: 1033a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1034a455589fSAl Viro parent, ret); 1035c435ee34SDavid Howells goto out_bad_parent; 10361da177e4SLinus Torvalds } 103708e0e7c8SDavid Howells 10381da177e4SLinus Torvalds out_valid: 1039a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10401da177e4SLinus Torvalds dput(parent); 104100d3b7a4SDavid Howells key_put(key); 10421da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10431da177e4SLinus Torvalds return 1; 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10461da177e4SLinus Torvalds not_found: 10471da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10481da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10491da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10501da177e4SLinus Torvalds 1051c435ee34SDavid Howells out_bad_parent: 1052a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10531da177e4SLinus Torvalds dput(parent); 1054c435ee34SDavid Howells out_bad: 105500d3b7a4SDavid Howells key_put(key); 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10581da177e4SLinus Torvalds return 0; 1059ec26815aSDavid Howells } 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds /* 10621da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10631da177e4SLinus Torvalds * sleep) 10641da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10651da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10661da177e4SLinus Torvalds */ 1067fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10681da177e4SLinus Torvalds { 1069a455589fSAl Viro _enter("%pd", dentry); 10701da177e4SLinus Torvalds 10711da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10721da177e4SLinus Torvalds goto zap; 10731da177e4SLinus Torvalds 10742b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10752b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10762b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10771da177e4SLinus Torvalds goto zap; 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10801da177e4SLinus Torvalds return 0; 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds zap: 10831da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10841da177e4SLinus Torvalds return 1; 1085ec26815aSDavid Howells } 1086260a9803SDavid Howells 1087260a9803SDavid Howells /* 108879ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 108979ddbfa5SDavid Howells */ 109079ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 109179ddbfa5SDavid Howells { 109279ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 109379ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 109479ddbfa5SDavid Howells iput(inode); 109579ddbfa5SDavid Howells } 109679ddbfa5SDavid Howells 109779ddbfa5SDavid Howells /* 1098260a9803SDavid Howells * handle dentry release 1099260a9803SDavid Howells */ 110066c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1101260a9803SDavid Howells { 1102a455589fSAl Viro _enter("%pd", dentry); 1103260a9803SDavid Howells } 1104260a9803SDavid Howells 1105260a9803SDavid Howells /* 1106d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1107d2ddc776SDavid Howells */ 1108d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1109d2ddc776SDavid Howells struct dentry *new_dentry, 1110d2ddc776SDavid Howells struct afs_fid *newfid, 1111a58823acSDavid Howells struct afs_status_cb *new_scb) 1112d2ddc776SDavid Howells { 11135a813276SDavid Howells struct afs_vnode *vnode; 1114d2ddc776SDavid Howells struct inode *inode; 1115d2ddc776SDavid Howells 1116d2ddc776SDavid Howells if (fc->ac.error < 0) 1117d2ddc776SDavid Howells return; 1118d2ddc776SDavid Howells 1119d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1120a58823acSDavid Howells newfid, new_scb, fc->cbi, fc->vnode); 1121d2ddc776SDavid Howells if (IS_ERR(inode)) { 1122d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1123d2ddc776SDavid Howells * the new directory on the server. 1124d2ddc776SDavid Howells */ 1125d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1126d2ddc776SDavid Howells return; 1127d2ddc776SDavid Howells } 1128d2ddc776SDavid Howells 11295a813276SDavid Howells vnode = AFS_FS_I(inode); 11305a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1131a58823acSDavid Howells if (fc->ac.error == 0) 1132a58823acSDavid Howells afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb); 113373116df7SDavid Howells d_instantiate(new_dentry, inode); 1134d2ddc776SDavid Howells } 1135d2ddc776SDavid Howells 1136d2ddc776SDavid Howells /* 1137260a9803SDavid Howells * create a directory on an AFS filesystem 1138260a9803SDavid Howells */ 113918bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1140260a9803SDavid Howells { 1141a58823acSDavid Howells struct afs_status_cb *scb; 1142d2ddc776SDavid Howells struct afs_fs_cursor fc; 1143d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1144d2ddc776SDavid Howells struct afs_fid newfid; 1145260a9803SDavid Howells struct key *key; 1146260a9803SDavid Howells int ret; 1147260a9803SDavid Howells 1148d2ddc776SDavid Howells mode |= S_IFDIR; 1149260a9803SDavid Howells 11503b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1151a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1152260a9803SDavid Howells 1153a58823acSDavid Howells ret = -ENOMEM; 1154a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1155a58823acSDavid Howells if (!scb) 1156a58823acSDavid Howells goto error; 1157a58823acSDavid Howells 1158260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1159260a9803SDavid Howells if (IS_ERR(key)) { 1160260a9803SDavid Howells ret = PTR_ERR(key); 1161a58823acSDavid Howells goto error_scb; 1162260a9803SDavid Howells } 1163260a9803SDavid Howells 1164d2ddc776SDavid Howells ret = -ERESTARTSYS; 116520b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1166a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1167a58823acSDavid Howells 1168d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 116968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1170a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1171a58823acSDavid Howells &scb[0], &newfid, &scb[1]); 1172d2ddc776SDavid Howells } 1173d2ddc776SDavid Howells 1174a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1175a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1176a58823acSDavid Howells &data_version, &scb[0]); 1177a58823acSDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]); 1178d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1179260a9803SDavid Howells if (ret < 0) 1180d2ddc776SDavid Howells goto error_key; 11814433b691SDavid Howells } else { 11824433b691SDavid Howells goto error_key; 1183260a9803SDavid Howells } 1184260a9803SDavid Howells 118563a4681fSDavid Howells if (ret == 0 && 118663a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 118763a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 118863a4681fSDavid Howells afs_edit_dir_for_create); 118963a4681fSDavid Howells 1190260a9803SDavid Howells key_put(key); 1191a58823acSDavid Howells kfree(scb); 1192260a9803SDavid Howells _leave(" = 0"); 1193260a9803SDavid Howells return 0; 1194260a9803SDavid Howells 1195d2ddc776SDavid Howells error_key: 1196260a9803SDavid Howells key_put(key); 1197a58823acSDavid Howells error_scb: 1198a58823acSDavid Howells kfree(scb); 1199260a9803SDavid Howells error: 1200260a9803SDavid Howells d_drop(dentry); 1201260a9803SDavid Howells _leave(" = %d", ret); 1202260a9803SDavid Howells return ret; 1203260a9803SDavid Howells } 1204260a9803SDavid Howells 1205260a9803SDavid Howells /* 1206d2ddc776SDavid Howells * Remove a subdir from a directory. 1207260a9803SDavid Howells */ 1208d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1209260a9803SDavid Howells { 12102b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1211d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1212d2ddc776SDavid Howells 1213260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1214260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1215c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 121663a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1217260a9803SDavid Howells } 1218260a9803SDavid Howells } 1219260a9803SDavid Howells 1220260a9803SDavid Howells /* 1221d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1222260a9803SDavid Howells */ 1223d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1224260a9803SDavid Howells { 1225a58823acSDavid Howells struct afs_status_cb *scb; 1226d2ddc776SDavid Howells struct afs_fs_cursor fc; 1227f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1228260a9803SDavid Howells struct key *key; 1229260a9803SDavid Howells int ret; 1230260a9803SDavid Howells 12313b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1232a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1233260a9803SDavid Howells 1234a58823acSDavid Howells scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); 1235a58823acSDavid Howells if (!scb) 1236a58823acSDavid Howells return -ENOMEM; 1237a58823acSDavid Howells 1238260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1239260a9803SDavid Howells if (IS_ERR(key)) { 1240260a9803SDavid Howells ret = PTR_ERR(key); 1241260a9803SDavid Howells goto error; 1242260a9803SDavid Howells } 1243260a9803SDavid Howells 1244f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1245f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1246f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1247f58db83fSDavid Howells ret = afs_validate(vnode, key); 1248f58db83fSDavid Howells if (ret < 0) 1249f58db83fSDavid Howells goto error_key; 1250f58db83fSDavid Howells } 1251f58db83fSDavid Howells 125279ddbfa5SDavid Howells if (vnode) { 125379ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 125479ddbfa5SDavid Howells if (ret < 0) 125579ddbfa5SDavid Howells goto error_key; 125679ddbfa5SDavid Howells } 125779ddbfa5SDavid Howells 1258d2ddc776SDavid Howells ret = -ERESTARTSYS; 125920b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1260a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1261a58823acSDavid Howells 1262d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 126368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1264a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb); 1265260a9803SDavid Howells } 1266260a9803SDavid Howells 1267a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1268a58823acSDavid Howells &data_version, scb); 1269d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 127063a4681fSDavid Howells if (ret == 0) { 1271d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 127263a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 127363a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 127463a4681fSDavid Howells afs_edit_dir_for_rmdir); 127563a4681fSDavid Howells } 1276260a9803SDavid Howells } 1277260a9803SDavid Howells 127879ddbfa5SDavid Howells if (vnode) 127979ddbfa5SDavid Howells up_write(&vnode->rmdir_lock); 1280f58db83fSDavid Howells error_key: 1281260a9803SDavid Howells key_put(key); 1282d2ddc776SDavid Howells error: 1283a58823acSDavid Howells kfree(scb); 1284d2ddc776SDavid Howells return ret; 1285d2ddc776SDavid Howells } 1286260a9803SDavid Howells 1287d2ddc776SDavid Howells /* 1288d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1289d2ddc776SDavid Howells * 1290d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1291d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1292d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1293d2ddc776SDavid Howells * 1294d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1295d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1296d2ddc776SDavid Howells */ 129779ddbfa5SDavid Howells int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1298440fbc3aSDavid Howells unsigned long d_version_before, 1299440fbc3aSDavid Howells unsigned long d_version_after) 1300d2ddc776SDavid Howells { 1301440fbc3aSDavid Howells bool dir_valid; 1302d2ddc776SDavid Howells int ret = 0; 1303d2ddc776SDavid Howells 1304440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1305440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1306440fbc3aSDavid Howells */ 1307440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1308440fbc3aSDavid Howells 1309d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1310d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1311d2ddc776SDavid Howells 131230062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 131330062bd1SDavid Howells /* Already done */ 131430062bd1SDavid Howells } else if (dir_valid) { 1315440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1316440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1317440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1318440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1319440fbc3aSDavid Howells } 1320440fbc3aSDavid Howells ret = 0; 1321440fbc3aSDavid Howells } else { 1322440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1323440fbc3aSDavid Howells 1324d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1325d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1326d2ddc776SDavid Howells 1327d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1328d2ddc776SDavid Howells if (ret == -ESTALE) 1329d2ddc776SDavid Howells ret = 0; 1330440fbc3aSDavid Howells } 1331d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1332d2ddc776SDavid Howells } 1333d2ddc776SDavid Howells 1334d2ddc776SDavid Howells return ret; 1335d2ddc776SDavid Howells } 1336d2ddc776SDavid Howells 1337d2ddc776SDavid Howells /* 1338d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1339d2ddc776SDavid Howells */ 1340d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1341d2ddc776SDavid Howells { 1342d2ddc776SDavid Howells struct afs_fs_cursor fc; 1343a58823acSDavid Howells struct afs_status_cb *scb; 134430062bd1SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1345d2ddc776SDavid Howells struct key *key; 1346440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 134779ddbfa5SDavid Howells bool need_rehash = false; 1348d2ddc776SDavid Howells int ret; 1349d2ddc776SDavid Howells 13503b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1351d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1352d2ddc776SDavid Howells 1353d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1354d2ddc776SDavid Howells return -ENAMETOOLONG; 1355d2ddc776SDavid Howells 1356a58823acSDavid Howells ret = -ENOMEM; 1357a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1358a58823acSDavid Howells if (!scb) 1359a58823acSDavid Howells goto error; 1360a58823acSDavid Howells 1361d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1362d2ddc776SDavid Howells if (IS_ERR(key)) { 1363d2ddc776SDavid Howells ret = PTR_ERR(key); 1364a58823acSDavid Howells goto error_scb; 1365d2ddc776SDavid Howells } 1366d2ddc776SDavid Howells 1367d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1368d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1369d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1370d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1371d2ddc776SDavid Howells if (ret < 0) 1372d2ddc776SDavid Howells goto error_key; 1373d2ddc776SDavid Howells } 1374d2ddc776SDavid Howells 137579ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 137679ddbfa5SDavid Howells if (vnode && d_count(dentry) > 1) { 137779ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 137879ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 137979ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 138079ddbfa5SDavid Howells ret = afs_sillyrename(dvnode, vnode, dentry, key); 138179ddbfa5SDavid Howells goto error_key; 138279ddbfa5SDavid Howells } 138379ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 138479ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 138579ddbfa5SDavid Howells __d_drop(dentry); 138679ddbfa5SDavid Howells need_rehash = true; 138779ddbfa5SDavid Howells } 138879ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 138979ddbfa5SDavid Howells 1390d2ddc776SDavid Howells ret = -ERESTARTSYS; 139120b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1392a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1393a58823acSDavid Howells 1394d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 139568251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 139630062bd1SDavid Howells 139730062bd1SDavid Howells if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && 139830062bd1SDavid Howells !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { 139930062bd1SDavid Howells yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, 1400a58823acSDavid Howells &scb[0], &scb[1]); 1401a58823acSDavid Howells if (fc.ac.error == 0 && 1402a58823acSDavid Howells scb[1].status.abort_code == VNOVNODE) { 1403a58823acSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1404a58823acSDavid Howells afs_break_callback(vnode); 1405a58823acSDavid Howells } 1406a58823acSDavid Howells 140730062bd1SDavid Howells if (fc.ac.error != -ECONNABORTED || 140830062bd1SDavid Howells fc.ac.abort_code != RXGEN_OPCODE) 140930062bd1SDavid Howells continue; 141030062bd1SDavid Howells set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); 141130062bd1SDavid Howells } 141230062bd1SDavid Howells 1413a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]); 1414d2ddc776SDavid Howells } 1415d2ddc776SDavid Howells 1416a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1417a58823acSDavid Howells &data_version, &scb[0]); 1418d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1419d2ddc776SDavid Howells if (ret == 0) 1420440fbc3aSDavid Howells ret = afs_dir_remove_link( 1421440fbc3aSDavid Howells dentry, key, d_version, 1422440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 142363a4681fSDavid Howells if (ret == 0 && 142463a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 142563a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 142663a4681fSDavid Howells afs_edit_dir_for_unlink); 1427d2ddc776SDavid Howells } 1428d2ddc776SDavid Howells 142979ddbfa5SDavid Howells if (need_rehash && ret < 0 && ret != -ENOENT) 143079ddbfa5SDavid Howells d_rehash(dentry); 143179ddbfa5SDavid Howells 1432d2ddc776SDavid Howells error_key: 1433260a9803SDavid Howells key_put(key); 1434a58823acSDavid Howells error_scb: 1435a58823acSDavid Howells kfree(scb); 1436260a9803SDavid Howells error: 1437260a9803SDavid Howells _leave(" = %d", ret); 1438260a9803SDavid Howells return ret; 1439260a9803SDavid Howells } 1440260a9803SDavid Howells 1441260a9803SDavid Howells /* 1442260a9803SDavid Howells * create a regular file on an AFS filesystem 1443260a9803SDavid Howells */ 14444acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1445ebfc3b49SAl Viro bool excl) 1446260a9803SDavid Howells { 1447d2ddc776SDavid Howells struct afs_fs_cursor fc; 1448a58823acSDavid Howells struct afs_status_cb *scb; 144943dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1450d2ddc776SDavid Howells struct afs_fid newfid; 1451260a9803SDavid Howells struct key *key; 1452260a9803SDavid Howells int ret; 1453260a9803SDavid Howells 1454d2ddc776SDavid Howells mode |= S_IFREG; 1455260a9803SDavid Howells 14563b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho,", 1457a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1458260a9803SDavid Howells 1459d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1460d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1461d2ddc776SDavid Howells goto error; 1462d2ddc776SDavid Howells 1463260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1464260a9803SDavid Howells if (IS_ERR(key)) { 1465260a9803SDavid Howells ret = PTR_ERR(key); 1466260a9803SDavid Howells goto error; 1467260a9803SDavid Howells } 1468260a9803SDavid Howells 1469a58823acSDavid Howells ret = -ENOMEM; 1470a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1471a58823acSDavid Howells if (!scb) 1472a58823acSDavid Howells goto error_scb; 1473a58823acSDavid Howells 1474d2ddc776SDavid Howells ret = -ERESTARTSYS; 147520b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1476a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1477a58823acSDavid Howells 1478d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 147968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1480a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1481a58823acSDavid Howells &scb[0], &newfid, &scb[1]); 1482d2ddc776SDavid Howells } 1483d2ddc776SDavid Howells 1484a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1485a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1486a58823acSDavid Howells &data_version, &scb[0]); 1487a58823acSDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]); 1488d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1489260a9803SDavid Howells if (ret < 0) 1490d2ddc776SDavid Howells goto error_key; 14914433b691SDavid Howells } else { 14924433b691SDavid Howells goto error_key; 1493260a9803SDavid Howells } 1494260a9803SDavid Howells 149563a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 149663a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 149763a4681fSDavid Howells afs_edit_dir_for_create); 149863a4681fSDavid Howells 1499a58823acSDavid Howells kfree(scb); 1500260a9803SDavid Howells key_put(key); 1501260a9803SDavid Howells _leave(" = 0"); 1502260a9803SDavid Howells return 0; 1503260a9803SDavid Howells 1504a58823acSDavid Howells error_scb: 1505a58823acSDavid Howells kfree(scb); 1506d2ddc776SDavid Howells error_key: 1507260a9803SDavid Howells key_put(key); 1508260a9803SDavid Howells error: 1509260a9803SDavid Howells d_drop(dentry); 1510260a9803SDavid Howells _leave(" = %d", ret); 1511260a9803SDavid Howells return ret; 1512260a9803SDavid Howells } 1513260a9803SDavid Howells 1514260a9803SDavid Howells /* 1515260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1516260a9803SDavid Howells */ 1517260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1518260a9803SDavid Howells struct dentry *dentry) 1519260a9803SDavid Howells { 1520d2ddc776SDavid Howells struct afs_fs_cursor fc; 1521a58823acSDavid Howells struct afs_status_cb *scb; 1522a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1523a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1524260a9803SDavid Howells struct key *key; 1525260a9803SDavid Howells int ret; 1526260a9803SDavid Howells 15273b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1528260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1529260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1530a455589fSAl Viro dentry); 1531260a9803SDavid Howells 1532d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1533d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1534d2ddc776SDavid Howells goto error; 1535d2ddc776SDavid Howells 1536a58823acSDavid Howells ret = -ENOMEM; 1537a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1538a58823acSDavid Howells if (!scb) 1539a58823acSDavid Howells goto error; 1540a58823acSDavid Howells 1541260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1542260a9803SDavid Howells if (IS_ERR(key)) { 1543260a9803SDavid Howells ret = PTR_ERR(key); 1544a58823acSDavid Howells goto error_scb; 1545260a9803SDavid Howells } 1546260a9803SDavid Howells 1547d2ddc776SDavid Howells ret = -ERESTARTSYS; 154820b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1549a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1550a58823acSDavid Howells 1551d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1552d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1553bc1527dcSDavid Howells goto error_key; 1554d2ddc776SDavid Howells } 1555260a9803SDavid Howells 1556d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 155768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 155868251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 1559a58823acSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, 1560a58823acSDavid Howells &scb[0], &scb[1]); 1561d2ddc776SDavid Howells } 1562d2ddc776SDavid Howells 1563a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1564a58823acSDavid Howells &data_version, &scb[0]); 1565a58823acSDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, 1566a58823acSDavid Howells NULL, &scb[1]); 15677de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1568260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1569d2ddc776SDavid Howells 1570d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1571d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1572d2ddc776SDavid Howells if (ret < 0) 1573d2ddc776SDavid Howells goto error_key; 15744433b691SDavid Howells } else { 15754433b691SDavid Howells goto error_key; 1576d2ddc776SDavid Howells } 1577d2ddc776SDavid Howells 157863a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 157963a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 158063a4681fSDavid Howells afs_edit_dir_for_link); 158163a4681fSDavid Howells 1582260a9803SDavid Howells key_put(key); 1583a58823acSDavid Howells kfree(scb); 1584260a9803SDavid Howells _leave(" = 0"); 1585260a9803SDavid Howells return 0; 1586260a9803SDavid Howells 1587d2ddc776SDavid Howells error_key: 1588260a9803SDavid Howells key_put(key); 1589a58823acSDavid Howells error_scb: 1590a58823acSDavid Howells kfree(scb); 1591260a9803SDavid Howells error: 1592260a9803SDavid Howells d_drop(dentry); 1593260a9803SDavid Howells _leave(" = %d", ret); 1594260a9803SDavid Howells return ret; 1595260a9803SDavid Howells } 1596260a9803SDavid Howells 1597260a9803SDavid Howells /* 1598260a9803SDavid Howells * create a symlink in an AFS filesystem 1599260a9803SDavid Howells */ 1600260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1601260a9803SDavid Howells const char *content) 1602260a9803SDavid Howells { 1603d2ddc776SDavid Howells struct afs_fs_cursor fc; 1604a58823acSDavid Howells struct afs_status_cb *scb; 1605d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1606d2ddc776SDavid Howells struct afs_fid newfid; 1607260a9803SDavid Howells struct key *key; 1608260a9803SDavid Howells int ret; 1609260a9803SDavid Howells 16103b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1611a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1612260a9803SDavid Howells content); 1613260a9803SDavid Howells 1614d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1615d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1616d2ddc776SDavid Howells goto error; 1617d2ddc776SDavid Howells 1618260a9803SDavid Howells ret = -EINVAL; 161945222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1620260a9803SDavid Howells goto error; 1621260a9803SDavid Howells 1622a58823acSDavid Howells ret = -ENOMEM; 1623a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1624a58823acSDavid Howells if (!scb) 1625a58823acSDavid Howells goto error; 1626a58823acSDavid Howells 1627260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1628260a9803SDavid Howells if (IS_ERR(key)) { 1629260a9803SDavid Howells ret = PTR_ERR(key); 1630a58823acSDavid Howells goto error_scb; 1631260a9803SDavid Howells } 1632260a9803SDavid Howells 1633d2ddc776SDavid Howells ret = -ERESTARTSYS; 163420b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1635a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1636a58823acSDavid Howells 1637d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 163868251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1639a58823acSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, content, 1640a58823acSDavid Howells &scb[0], &newfid, &scb[1]); 1641d2ddc776SDavid Howells } 1642d2ddc776SDavid Howells 1643a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1644a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1645a58823acSDavid Howells &data_version, &scb[0]); 1646a58823acSDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]); 1647d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1648260a9803SDavid Howells if (ret < 0) 1649d2ddc776SDavid Howells goto error_key; 16504433b691SDavid Howells } else { 16514433b691SDavid Howells goto error_key; 1652260a9803SDavid Howells } 1653260a9803SDavid Howells 165463a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 165563a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 165663a4681fSDavid Howells afs_edit_dir_for_symlink); 165763a4681fSDavid Howells 1658260a9803SDavid Howells key_put(key); 1659a58823acSDavid Howells kfree(scb); 1660260a9803SDavid Howells _leave(" = 0"); 1661260a9803SDavid Howells return 0; 1662260a9803SDavid Howells 1663d2ddc776SDavid Howells error_key: 1664260a9803SDavid Howells key_put(key); 1665a58823acSDavid Howells error_scb: 1666a58823acSDavid Howells kfree(scb); 1667260a9803SDavid Howells error: 1668260a9803SDavid Howells d_drop(dentry); 1669260a9803SDavid Howells _leave(" = %d", ret); 1670260a9803SDavid Howells return ret; 1671260a9803SDavid Howells } 1672260a9803SDavid Howells 1673260a9803SDavid Howells /* 1674260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1675260a9803SDavid Howells */ 1676260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 16771cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 16781cd66c93SMiklos Szeredi unsigned int flags) 1679260a9803SDavid Howells { 1680d2ddc776SDavid Howells struct afs_fs_cursor fc; 1681a58823acSDavid Howells struct afs_status_cb *scb; 1682260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 168379ddbfa5SDavid Howells struct dentry *tmp = NULL, *rehash = NULL; 168479ddbfa5SDavid Howells struct inode *new_inode; 1685260a9803SDavid Howells struct key *key; 168663a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1687260a9803SDavid Howells int ret; 1688260a9803SDavid Howells 16891cd66c93SMiklos Szeredi if (flags) 16901cd66c93SMiklos Szeredi return -EINVAL; 16911cd66c93SMiklos Szeredi 169279ddbfa5SDavid Howells /* Don't allow silly-rename files be moved around. */ 169379ddbfa5SDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 169479ddbfa5SDavid Howells return -EINVAL; 169579ddbfa5SDavid Howells 16962b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1697260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1698260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1699260a9803SDavid Howells 17003b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1701260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1702260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1703260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1704a455589fSAl Viro new_dentry); 1705260a9803SDavid Howells 1706a58823acSDavid Howells ret = -ENOMEM; 1707a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1708a58823acSDavid Howells if (!scb) 1709a58823acSDavid Howells goto error; 1710a58823acSDavid Howells 1711260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1712260a9803SDavid Howells if (IS_ERR(key)) { 1713260a9803SDavid Howells ret = PTR_ERR(key); 1714a58823acSDavid Howells goto error_scb; 1715260a9803SDavid Howells } 1716260a9803SDavid Howells 171779ddbfa5SDavid Howells /* For non-directories, check whether the target is busy and if so, 171879ddbfa5SDavid Howells * make a copy of the dentry and then do a silly-rename. If the 171979ddbfa5SDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 172079ddbfa5SDavid Howells * new target. 172179ddbfa5SDavid Howells */ 172279ddbfa5SDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 172379ddbfa5SDavid Howells /* To prevent any new references to the target during the 172479ddbfa5SDavid Howells * rename, we unhash the dentry in advance. 172579ddbfa5SDavid Howells */ 172679ddbfa5SDavid Howells if (!d_unhashed(new_dentry)) { 172779ddbfa5SDavid Howells d_drop(new_dentry); 172879ddbfa5SDavid Howells rehash = new_dentry; 172979ddbfa5SDavid Howells } 173079ddbfa5SDavid Howells 173179ddbfa5SDavid Howells if (d_count(new_dentry) > 2) { 173279ddbfa5SDavid Howells /* copy the target dentry's name */ 173379ddbfa5SDavid Howells ret = -ENOMEM; 173479ddbfa5SDavid Howells tmp = d_alloc(new_dentry->d_parent, 173579ddbfa5SDavid Howells &new_dentry->d_name); 173679ddbfa5SDavid Howells if (!tmp) 173779ddbfa5SDavid Howells goto error_rehash; 173879ddbfa5SDavid Howells 173979ddbfa5SDavid Howells ret = afs_sillyrename(new_dvnode, 174079ddbfa5SDavid Howells AFS_FS_I(d_inode(new_dentry)), 174179ddbfa5SDavid Howells new_dentry, key); 174279ddbfa5SDavid Howells if (ret) 174379ddbfa5SDavid Howells goto error_rehash; 174479ddbfa5SDavid Howells 174579ddbfa5SDavid Howells new_dentry = tmp; 174679ddbfa5SDavid Howells rehash = NULL; 174779ddbfa5SDavid Howells new_negative = true; 174879ddbfa5SDavid Howells } 174979ddbfa5SDavid Howells } 175079ddbfa5SDavid Howells 1751d2ddc776SDavid Howells ret = -ERESTARTSYS; 175220b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) { 1753a58823acSDavid Howells afs_dataversion_t orig_data_version; 1754a58823acSDavid Howells afs_dataversion_t new_data_version; 1755a58823acSDavid Howells struct afs_status_cb *new_scb = &scb[1]; 1756a58823acSDavid Howells 1757a58823acSDavid Howells orig_data_version = orig_dvnode->status.data_version + 1; 1758a58823acSDavid Howells 1759d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1760d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1761d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 176279ddbfa5SDavid Howells goto error_rehash; 1763d2ddc776SDavid Howells } 1764a58823acSDavid Howells new_data_version = new_dvnode->status.data_version; 1765a58823acSDavid Howells } else { 1766a58823acSDavid Howells new_data_version = orig_data_version; 1767a58823acSDavid Howells new_scb = &scb[0]; 1768d2ddc776SDavid Howells } 1769a58823acSDavid Howells 1770d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 177168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 177268251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1773d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 177463a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 1775a58823acSDavid Howells &scb[0], new_scb); 1776d2ddc776SDavid Howells } 1777d2ddc776SDavid Howells 1778a58823acSDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break, 1779a58823acSDavid Howells &orig_data_version, &scb[0]); 1780a58823acSDavid Howells if (new_dvnode != orig_dvnode) { 1781a58823acSDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2, 1782a58823acSDavid Howells &new_data_version, &scb[1]); 1783d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1784a58823acSDavid Howells } 1785d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1786260a9803SDavid Howells if (ret < 0) 178779ddbfa5SDavid Howells goto error_rehash; 1788d2ddc776SDavid Howells } 1789d2ddc776SDavid Howells 179063a4681fSDavid Howells if (ret == 0) { 179179ddbfa5SDavid Howells if (rehash) 179279ddbfa5SDavid Howells d_rehash(rehash); 179363a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 179463a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 179579ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 179663a4681fSDavid Howells 179763a4681fSDavid Howells if (!new_negative && 179863a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 179963a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 180079ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 180163a4681fSDavid Howells 180263a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 180363a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 180479ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 180579ddbfa5SDavid Howells 180679ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 180779ddbfa5SDavid Howells if (new_inode) { 180879ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 180979ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 181079ddbfa5SDavid Howells drop_nlink(new_inode); 181179ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 181279ddbfa5SDavid Howells } 181379ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 181479ddbfa5SDavid Howells goto error_tmp; 181563a4681fSDavid Howells } 181663a4681fSDavid Howells 181779ddbfa5SDavid Howells error_rehash: 181879ddbfa5SDavid Howells if (rehash) 181979ddbfa5SDavid Howells d_rehash(rehash); 182079ddbfa5SDavid Howells error_tmp: 182179ddbfa5SDavid Howells if (tmp) 182279ddbfa5SDavid Howells dput(tmp); 1823260a9803SDavid Howells key_put(key); 1824a58823acSDavid Howells error_scb: 1825a58823acSDavid Howells kfree(scb); 1826260a9803SDavid Howells error: 1827260a9803SDavid Howells _leave(" = %d", ret); 1828260a9803SDavid Howells return ret; 1829260a9803SDavid Howells } 1830f3ddee8dSDavid Howells 1831f3ddee8dSDavid Howells /* 1832f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1833f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1834f3ddee8dSDavid Howells */ 1835f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1836f3ddee8dSDavid Howells { 1837f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1838f3ddee8dSDavid Howells 18393b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1840f3ddee8dSDavid Howells 1841f3ddee8dSDavid Howells set_page_private(page, 0); 1842f3ddee8dSDavid Howells ClearPagePrivate(page); 1843f3ddee8dSDavid Howells 1844f3ddee8dSDavid Howells /* The directory will need reloading. */ 1845f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1846f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1847f3ddee8dSDavid Howells return 1; 1848f3ddee8dSDavid Howells } 1849f3ddee8dSDavid Howells 1850f3ddee8dSDavid Howells /* 1851f3ddee8dSDavid Howells * invalidate part or all of a page 1852f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1853f3ddee8dSDavid Howells * the entire page) 1854f3ddee8dSDavid Howells */ 1855f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1856f3ddee8dSDavid Howells unsigned int length) 1857f3ddee8dSDavid Howells { 1858f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1859f3ddee8dSDavid Howells 1860f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1861f3ddee8dSDavid Howells 1862f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1863f3ddee8dSDavid Howells 1864f3ddee8dSDavid Howells /* The directory will need reloading. */ 1865f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1866f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1867f3ddee8dSDavid Howells 1868f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1869f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1870f3ddee8dSDavid Howells set_page_private(page, 0); 1871f3ddee8dSDavid Howells ClearPagePrivate(page); 1872f3ddee8dSDavid Howells } 1873f3ddee8dSDavid Howells } 1874