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; 641f642404aSDavid Howells struct afs_cb_interest *dcbi, *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; 646f642404aSDavid Howells struct afs_server *server; 6475cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 6485cf9dd55SDavid Howells struct inode *inode = NULL; 6495cf9dd55SDavid Howells int ret, i; 6505cf9dd55SDavid Howells 6515cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6525cf9dd55SDavid Howells 6535cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6545cf9dd55SDavid Howells if (!cookie) 6555cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6565cf9dd55SDavid Howells 6575cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6585cf9dd55SDavid Howells cookie->name = dentry->d_name; 6595cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6605cf9dd55SDavid Howells 6615cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 662f642404aSDavid Howells dcbi = rcu_dereference_protected(dvnode->cb_interest, 663f642404aSDavid Howells lockdep_is_held(&dvnode->cb_lock.lock)); 664f642404aSDavid Howells if (dcbi) { 665f642404aSDavid Howells server = dcbi->server; 666f642404aSDavid Howells if (server && 667f642404aSDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 6685cf9dd55SDavid Howells cookie->one_only = true; 669f642404aSDavid Howells } 6705cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6715cf9dd55SDavid Howells 6725cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6735cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6745cf9dd55SDavid Howells 6755cf9dd55SDavid Howells /* search the directory */ 6765cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 6775cf9dd55SDavid Howells if (ret < 0) { 6785cf9dd55SDavid Howells inode = ERR_PTR(ret); 6795cf9dd55SDavid Howells goto out; 6805cf9dd55SDavid Howells } 6815cf9dd55SDavid Howells 6825cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6835cf9dd55SDavid Howells if (!cookie->found) 6845cf9dd55SDavid Howells goto out; 6855cf9dd55SDavid Howells 6865cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 6875cf9dd55SDavid Howells data.volume = dvnode->volume; 6885cf9dd55SDavid Howells data.fid = cookie->fids[0]; 6895cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 6905cf9dd55SDavid Howells if (inode) 6915cf9dd55SDavid Howells goto out; 6925cf9dd55SDavid Howells 6935cf9dd55SDavid Howells /* Need space for examining all the selected files */ 6945cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 69587182759SDavid Howells cookie->statuses = kvcalloc(cookie->nr_fids, sizeof(struct afs_status_cb), 6965cf9dd55SDavid Howells GFP_KERNEL); 6975cf9dd55SDavid Howells if (!cookie->statuses) 6985cf9dd55SDavid Howells goto out; 6995cf9dd55SDavid Howells 7005cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 7015cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 7025cf9dd55SDavid Howells * the whole operation. 7035cf9dd55SDavid Howells */ 7045cf9dd55SDavid Howells if (cookie->one_only) 7055cf9dd55SDavid Howells goto no_inline_bulk_status; 7065cf9dd55SDavid Howells 7075cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 70820b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7095cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7105cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 7115cf9dd55SDavid Howells &fc.cbi->server->flags)) { 7125cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 7135cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 7145cf9dd55SDavid Howells break; 7155cf9dd55SDavid Howells } 7165cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 7175cf9dd55SDavid Howells afs_v2net(dvnode), 7185cf9dd55SDavid Howells cookie->fids, 7195cf9dd55SDavid Howells cookie->statuses, 7205cf9dd55SDavid Howells cookie->nr_fids, NULL); 7215cf9dd55SDavid Howells } 7225cf9dd55SDavid Howells 7235cf9dd55SDavid Howells if (fc.ac.error == 0) 7245cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7255cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 7265cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 7275cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7285cf9dd55SDavid Howells } 7295cf9dd55SDavid Howells 7305cf9dd55SDavid Howells if (!IS_ERR(inode)) 7315cf9dd55SDavid Howells goto success; 7325cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 7335cf9dd55SDavid Howells goto out_c; 7345cf9dd55SDavid Howells 7355cf9dd55SDavid Howells no_inline_bulk_status: 7365cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7375cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7385cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7395cf9dd55SDavid Howells */ 7405cf9dd55SDavid Howells cookie->nr_fids = 1; 7415cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 74220b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 7435cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 74487182759SDavid Howells scb = &cookie->statuses[0]; 7455cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7465cf9dd55SDavid Howells afs_v2net(dvnode), 7475cf9dd55SDavid Howells cookie->fids, 748a58823acSDavid Howells scb, 7495cf9dd55SDavid Howells NULL); 7505cf9dd55SDavid Howells } 7515cf9dd55SDavid Howells 7525cf9dd55SDavid Howells if (fc.ac.error == 0) 7535cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7545cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7555cf9dd55SDavid Howells } 7565cf9dd55SDavid Howells 7575cf9dd55SDavid Howells if (IS_ERR(inode)) 7585cf9dd55SDavid Howells goto out_c; 7595cf9dd55SDavid Howells 7605cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 76187182759SDavid Howells cookie->statuses[i].status.abort_code = 0; 7625cf9dd55SDavid Howells 7635cf9dd55SDavid Howells success: 7645cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7655cf9dd55SDavid Howells * one we actually want. 7665cf9dd55SDavid Howells */ 76787182759SDavid Howells scb = &cookie->statuses[0]; 76887182759SDavid Howells if (scb->status.abort_code != 0) 76987182759SDavid Howells inode = ERR_PTR(afs_abort_to_error(scb->status.abort_code)); 7705cf9dd55SDavid Howells 7715cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 77287182759SDavid Howells struct afs_status_cb *scb = &cookie->statuses[i]; 7735cf9dd55SDavid Howells struct inode *ti; 7745cf9dd55SDavid Howells 77587182759SDavid Howells if (scb->status.abort_code != 0) 7765cf9dd55SDavid Howells continue; 7775cf9dd55SDavid Howells 7785cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 779a58823acSDavid Howells scb, cbi, dvnode); 7805cf9dd55SDavid Howells if (i == 0) { 7815cf9dd55SDavid Howells inode = ti; 7825cf9dd55SDavid Howells } else { 7835cf9dd55SDavid Howells if (!IS_ERR(ti)) 7845cf9dd55SDavid Howells iput(ti); 7855cf9dd55SDavid Howells } 7865cf9dd55SDavid Howells } 7875cf9dd55SDavid Howells 7885cf9dd55SDavid Howells out_c: 7895cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 79087182759SDavid Howells kvfree(cookie->statuses); 7915cf9dd55SDavid Howells out: 7925cf9dd55SDavid Howells kfree(cookie); 7935cf9dd55SDavid Howells return inode; 7945cf9dd55SDavid Howells } 7955cf9dd55SDavid Howells 7965cf9dd55SDavid Howells /* 7976f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 7986f8880d8SDavid Howells */ 7996f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 8006f8880d8SDavid Howells struct key *key) 8016f8880d8SDavid Howells { 8026f8880d8SDavid Howells struct afs_sysnames *subs; 8036f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8046f8880d8SDavid Howells struct dentry *ret; 8056f8880d8SDavid Howells char *buf, *p, *name; 8066f8880d8SDavid Howells int len, i; 8076f8880d8SDavid Howells 8086f8880d8SDavid Howells _enter(""); 8096f8880d8SDavid Howells 8106f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8116f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8126f8880d8SDavid Howells if (!buf) 8136f8880d8SDavid Howells goto out_p; 8146f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8156f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8166f8880d8SDavid Howells p += dentry->d_name.len - 4; 8176f8880d8SDavid Howells } 8186f8880d8SDavid Howells 8196f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8206f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8216f8880d8SDavid Howells subs = net->sysnames; 8226f8880d8SDavid Howells refcount_inc(&subs->usage); 8236f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8246f8880d8SDavid Howells 8256f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8266f8880d8SDavid Howells name = subs->subs[i]; 8276f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8286f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8296f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8306f8880d8SDavid Howells goto out_s; 8316f8880d8SDavid Howells } 8326f8880d8SDavid Howells 8336f8880d8SDavid Howells strcpy(p, name); 8346f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8356f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8366f8880d8SDavid Howells goto out_s; 8376f8880d8SDavid Howells dput(ret); 8386f8880d8SDavid Howells } 8396f8880d8SDavid Howells 8406f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8416f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8426f8880d8SDavid Howells */ 8436f8880d8SDavid Howells ret = NULL; 8446f8880d8SDavid Howells out_s: 8456f8880d8SDavid Howells afs_put_sysnames(subs); 8466f8880d8SDavid Howells kfree(buf); 8476f8880d8SDavid Howells out_p: 8486f8880d8SDavid Howells key_put(key); 8496f8880d8SDavid Howells return ret; 8506f8880d8SDavid Howells } 8516f8880d8SDavid Howells 8526f8880d8SDavid Howells /* 85308e0e7c8SDavid Howells * look up an entry in a directory 85408e0e7c8SDavid Howells */ 855260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 85600cd8dd3SAl Viro unsigned int flags) 85708e0e7c8SDavid Howells { 8585cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 85908e0e7c8SDavid Howells struct inode *inode; 86034b2a88fSAl Viro struct dentry *d; 86100d3b7a4SDavid Howells struct key *key; 86208e0e7c8SDavid Howells int ret; 86308e0e7c8SDavid Howells 8643b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 8655cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 866260a9803SDavid Howells 8672b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 86808e0e7c8SDavid Howells 86945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 87008e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 87108e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 87208e0e7c8SDavid Howells } 87308e0e7c8SDavid Howells 8745cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 87508e0e7c8SDavid Howells _leave(" = -ESTALE"); 87608e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 87708e0e7c8SDavid Howells } 87808e0e7c8SDavid Howells 8795cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 88000d3b7a4SDavid Howells if (IS_ERR(key)) { 88100d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 882e231c2eeSDavid Howells return ERR_CAST(key); 88300d3b7a4SDavid Howells } 88400d3b7a4SDavid Howells 8855cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 88608e0e7c8SDavid Howells if (ret < 0) { 88700d3b7a4SDavid Howells key_put(key); 888260a9803SDavid Howells _leave(" = %d [val]", ret); 8891da177e4SLinus Torvalds return ERR_PTR(ret); 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds 8926f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8936f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8946f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 8956f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 8966f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 8976f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 8986f8880d8SDavid Howells 899d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 9005cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 90134b2a88fSAl Viro key_put(key); 90234b2a88fSAl Viro if (inode == ERR_PTR(-ENOENT)) { 9035cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 90434b2a88fSAl Viro } else { 90534b2a88fSAl Viro dentry->d_fsdata = 90634b2a88fSAl Viro (void *)(unsigned long)dvnode->status.data_version; 907bec5eb61Swanglei } 90834b2a88fSAl Viro d = d_splice_alias(inode, dentry); 90980548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 91034b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 91180548b03SDavid Howells trace_afs_lookup(dvnode, &d->d_name, 91280548b03SDavid Howells inode ? AFS_FS_I(inode) : NULL); 91380548b03SDavid Howells } else { 91480548b03SDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, 91580548b03SDavid Howells inode ? AFS_FS_I(inode) : NULL); 91680548b03SDavid Howells } 91734b2a88fSAl Viro return d; 918ec26815aSDavid Howells } 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds /* 9211da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 9221da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 9231da177e4SLinus Torvalds * inode 9241da177e4SLinus Torvalds */ 9250b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 9261da177e4SLinus Torvalds { 927260a9803SDavid Howells struct afs_vnode *vnode, *dir; 928dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 9291da177e4SLinus Torvalds struct dentry *parent; 930c435ee34SDavid Howells struct inode *inode; 93100d3b7a4SDavid Howells struct key *key; 932a4ff7401SDavid Howells long dir_version, de_version; 9331da177e4SLinus Torvalds int ret; 9341da177e4SLinus Torvalds 9350b728e19SAl Viro if (flags & LOOKUP_RCU) 93634286d66SNick Piggin return -ECHILD; 93734286d66SNick Piggin 938c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9392b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 9403b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 941a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 942260a9803SDavid Howells vnode->flags); 943c435ee34SDavid Howells } else { 944a455589fSAl Viro _enter("{neg n=%pd}", dentry); 945c435ee34SDavid Howells } 9461da177e4SLinus Torvalds 947260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 94800d3b7a4SDavid Howells if (IS_ERR(key)) 94900d3b7a4SDavid Howells key = NULL; 95000d3b7a4SDavid Howells 951c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 952c435ee34SDavid Howells inode = d_inode(dentry); 953c435ee34SDavid Howells if (inode) { 954c435ee34SDavid Howells vnode = AFS_FS_I(inode); 955c435ee34SDavid Howells afs_validate(vnode, key); 956c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 957c435ee34SDavid Howells goto out_bad; 958c435ee34SDavid Howells } 959c435ee34SDavid Howells } 960c435ee34SDavid Howells 9611da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 96208e0e7c8SDavid Howells parent = dget_parent(dentry); 9632b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9641da177e4SLinus Torvalds 965260a9803SDavid Howells /* validate the parent directory */ 966260a9803SDavid Howells afs_validate(dir, key); 967260a9803SDavid Howells 968260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 969a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 970c435ee34SDavid Howells goto out_bad_parent; 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds 973a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 974a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 975a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 976a4ff7401SDavid Howells * version. 977a4ff7401SDavid Howells */ 978a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 979a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 980a4ff7401SDavid Howells if (de_version == dir_version) 981a4ff7401SDavid Howells goto out_valid; 982a4ff7401SDavid Howells 983a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 984a4ff7401SDavid Howells if (de_version - dir_version >= 0) 985a4ff7401SDavid Howells goto out_valid; 986260a9803SDavid Howells 98708e0e7c8SDavid Howells _debug("dir modified"); 988d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds /* search the directory for this vnode */ 9915cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 992260a9803SDavid Howells switch (ret) { 993260a9803SDavid Howells case 0: 994260a9803SDavid Howells /* the filename maps to something */ 9952b0143b5SDavid Howells if (d_really_is_negative(dentry)) 996c435ee34SDavid Howells goto out_bad_parent; 997c435ee34SDavid Howells inode = d_inode(dentry); 998c435ee34SDavid Howells if (is_bad_inode(inode)) { 999a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1000a455589fSAl Viro dentry); 1001c435ee34SDavid Howells goto out_bad_parent; 10021da177e4SLinus Torvalds } 10031da177e4SLinus Torvalds 1004c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1005c435ee34SDavid Howells 10061da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 10071da177e4SLinus Torvalds * different file */ 100808e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 10093b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1010a455589fSAl Viro dentry, fid.vnode, 101108e0e7c8SDavid Howells vnode->fid.vnode); 10121da177e4SLinus Torvalds goto not_found; 10131da177e4SLinus Torvalds } 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1016260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1017260a9803SDavid Howells * been reused */ 101808e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1019a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1020a455589fSAl Viro dentry, fid.unique, 10217a224228SJean Noel Cordenner vnode->fid.unique, 1022c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1023c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 102408e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1025c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1026260a9803SDavid Howells goto not_found; 1027260a9803SDavid Howells } 1028260a9803SDavid Howells goto out_valid; 1029260a9803SDavid Howells 1030260a9803SDavid Howells case -ENOENT: 1031260a9803SDavid Howells /* the filename is unknown */ 1032a455589fSAl Viro _debug("%pd: dirent not found", dentry); 10332b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1034260a9803SDavid Howells goto not_found; 1035260a9803SDavid Howells goto out_valid; 1036260a9803SDavid Howells 1037260a9803SDavid Howells default: 1038a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1039a455589fSAl Viro parent, ret); 1040c435ee34SDavid Howells goto out_bad_parent; 10411da177e4SLinus Torvalds } 104208e0e7c8SDavid Howells 10431da177e4SLinus Torvalds out_valid: 1044a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10451da177e4SLinus Torvalds dput(parent); 104600d3b7a4SDavid Howells key_put(key); 10471da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10481da177e4SLinus Torvalds return 1; 10491da177e4SLinus Torvalds 10501da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10511da177e4SLinus Torvalds not_found: 10521da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10531da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10541da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10551da177e4SLinus Torvalds 1056c435ee34SDavid Howells out_bad_parent: 1057a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10581da177e4SLinus Torvalds dput(parent); 1059c435ee34SDavid Howells out_bad: 106000d3b7a4SDavid Howells key_put(key); 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10631da177e4SLinus Torvalds return 0; 1064ec26815aSDavid Howells } 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds /* 10671da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10681da177e4SLinus Torvalds * sleep) 10691da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10701da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10711da177e4SLinus Torvalds */ 1072fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10731da177e4SLinus Torvalds { 1074a455589fSAl Viro _enter("%pd", dentry); 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10771da177e4SLinus Torvalds goto zap; 10781da177e4SLinus Torvalds 10792b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10802b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10812b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10821da177e4SLinus Torvalds goto zap; 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10851da177e4SLinus Torvalds return 0; 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds zap: 10881da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10891da177e4SLinus Torvalds return 1; 1090ec26815aSDavid Howells } 1091260a9803SDavid Howells 1092260a9803SDavid Howells /* 109379ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 109479ddbfa5SDavid Howells */ 109579ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 109679ddbfa5SDavid Howells { 109779ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 109879ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 109979ddbfa5SDavid Howells iput(inode); 110079ddbfa5SDavid Howells } 110179ddbfa5SDavid Howells 110279ddbfa5SDavid Howells /* 1103260a9803SDavid Howells * handle dentry release 1104260a9803SDavid Howells */ 110566c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1106260a9803SDavid Howells { 1107a455589fSAl Viro _enter("%pd", dentry); 1108260a9803SDavid Howells } 1109260a9803SDavid Howells 1110260a9803SDavid Howells /* 1111d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1112d2ddc776SDavid Howells */ 1113d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1114d2ddc776SDavid Howells struct dentry *new_dentry, 1115d2ddc776SDavid Howells struct afs_fid *newfid, 1116a58823acSDavid Howells struct afs_status_cb *new_scb) 1117d2ddc776SDavid Howells { 11185a813276SDavid Howells struct afs_vnode *vnode; 1119d2ddc776SDavid Howells struct inode *inode; 1120d2ddc776SDavid Howells 1121d2ddc776SDavid Howells if (fc->ac.error < 0) 1122d2ddc776SDavid Howells return; 1123d2ddc776SDavid Howells 1124d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1125a58823acSDavid Howells newfid, new_scb, fc->cbi, fc->vnode); 1126d2ddc776SDavid Howells if (IS_ERR(inode)) { 1127d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1128d2ddc776SDavid Howells * the new directory on the server. 1129d2ddc776SDavid Howells */ 1130d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1131d2ddc776SDavid Howells return; 1132d2ddc776SDavid Howells } 1133d2ddc776SDavid Howells 11345a813276SDavid Howells vnode = AFS_FS_I(inode); 11355a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1136a58823acSDavid Howells if (fc->ac.error == 0) 1137a58823acSDavid Howells afs_cache_permit(vnode, fc->key, vnode->cb_break, new_scb); 113873116df7SDavid Howells d_instantiate(new_dentry, inode); 1139d2ddc776SDavid Howells } 1140d2ddc776SDavid Howells 1141d2ddc776SDavid Howells /* 1142260a9803SDavid Howells * create a directory on an AFS filesystem 1143260a9803SDavid Howells */ 114418bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1145260a9803SDavid Howells { 1146a58823acSDavid Howells struct afs_status_cb *scb; 1147d2ddc776SDavid Howells struct afs_fs_cursor fc; 1148d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1149d2ddc776SDavid Howells struct afs_fid newfid; 1150260a9803SDavid Howells struct key *key; 1151260a9803SDavid Howells int ret; 1152260a9803SDavid Howells 1153d2ddc776SDavid Howells mode |= S_IFDIR; 1154260a9803SDavid Howells 11553b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1156a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1157260a9803SDavid Howells 1158a58823acSDavid Howells ret = -ENOMEM; 1159a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1160a58823acSDavid Howells if (!scb) 1161a58823acSDavid Howells goto error; 1162a58823acSDavid Howells 1163260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1164260a9803SDavid Howells if (IS_ERR(key)) { 1165260a9803SDavid Howells ret = PTR_ERR(key); 1166a58823acSDavid Howells goto error_scb; 1167260a9803SDavid Howells } 1168260a9803SDavid Howells 1169d2ddc776SDavid Howells ret = -ERESTARTSYS; 117020b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1171a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1172a58823acSDavid Howells 1173d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 117468251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1175a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1176a58823acSDavid Howells &scb[0], &newfid, &scb[1]); 1177d2ddc776SDavid Howells } 1178d2ddc776SDavid Howells 1179a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1180a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1181a58823acSDavid Howells &data_version, &scb[0]); 1182a58823acSDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]); 1183d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1184260a9803SDavid Howells if (ret < 0) 1185d2ddc776SDavid Howells goto error_key; 11864433b691SDavid Howells } else { 11874433b691SDavid Howells goto error_key; 1188260a9803SDavid Howells } 1189260a9803SDavid Howells 119063a4681fSDavid Howells if (ret == 0 && 119163a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 119263a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 119363a4681fSDavid Howells afs_edit_dir_for_create); 119463a4681fSDavid Howells 1195260a9803SDavid Howells key_put(key); 1196a58823acSDavid Howells kfree(scb); 1197260a9803SDavid Howells _leave(" = 0"); 1198260a9803SDavid Howells return 0; 1199260a9803SDavid Howells 1200d2ddc776SDavid Howells error_key: 1201260a9803SDavid Howells key_put(key); 1202a58823acSDavid Howells error_scb: 1203a58823acSDavid Howells kfree(scb); 1204260a9803SDavid Howells error: 1205260a9803SDavid Howells d_drop(dentry); 1206260a9803SDavid Howells _leave(" = %d", ret); 1207260a9803SDavid Howells return ret; 1208260a9803SDavid Howells } 1209260a9803SDavid Howells 1210260a9803SDavid Howells /* 1211d2ddc776SDavid Howells * Remove a subdir from a directory. 1212260a9803SDavid Howells */ 1213d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1214260a9803SDavid Howells { 12152b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1216d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1217d2ddc776SDavid Howells 1218260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1219260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1220c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 122163a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1222260a9803SDavid Howells } 1223260a9803SDavid Howells } 1224260a9803SDavid Howells 1225260a9803SDavid Howells /* 1226d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1227260a9803SDavid Howells */ 1228d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1229260a9803SDavid Howells { 1230a58823acSDavid Howells struct afs_status_cb *scb; 1231d2ddc776SDavid Howells struct afs_fs_cursor fc; 1232f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1233260a9803SDavid Howells struct key *key; 1234260a9803SDavid Howells int ret; 1235260a9803SDavid Howells 12363b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1237a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1238260a9803SDavid Howells 1239a58823acSDavid Howells scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); 1240a58823acSDavid Howells if (!scb) 1241a58823acSDavid Howells return -ENOMEM; 1242a58823acSDavid Howells 1243260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1244260a9803SDavid Howells if (IS_ERR(key)) { 1245260a9803SDavid Howells ret = PTR_ERR(key); 1246260a9803SDavid Howells goto error; 1247260a9803SDavid Howells } 1248260a9803SDavid Howells 1249f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1250f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1251f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1252f58db83fSDavid Howells ret = afs_validate(vnode, key); 1253f58db83fSDavid Howells if (ret < 0) 1254f58db83fSDavid Howells goto error_key; 1255f58db83fSDavid Howells } 1256f58db83fSDavid Howells 125779ddbfa5SDavid Howells if (vnode) { 125879ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 125979ddbfa5SDavid Howells if (ret < 0) 126079ddbfa5SDavid Howells goto error_key; 126179ddbfa5SDavid Howells } 126279ddbfa5SDavid Howells 1263d2ddc776SDavid Howells ret = -ERESTARTSYS; 126420b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1265a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1266a58823acSDavid Howells 1267d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 126868251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1269a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, true, scb); 1270260a9803SDavid Howells } 1271260a9803SDavid Howells 1272a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1273a58823acSDavid Howells &data_version, scb); 1274d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 127563a4681fSDavid Howells if (ret == 0) { 1276d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 127763a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 127863a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 127963a4681fSDavid Howells afs_edit_dir_for_rmdir); 128063a4681fSDavid Howells } 1281260a9803SDavid Howells } 1282260a9803SDavid Howells 128379ddbfa5SDavid Howells if (vnode) 128479ddbfa5SDavid Howells up_write(&vnode->rmdir_lock); 1285f58db83fSDavid Howells error_key: 1286260a9803SDavid Howells key_put(key); 1287d2ddc776SDavid Howells error: 1288a58823acSDavid Howells kfree(scb); 1289d2ddc776SDavid Howells return ret; 1290d2ddc776SDavid Howells } 1291260a9803SDavid Howells 1292d2ddc776SDavid Howells /* 1293d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1294d2ddc776SDavid Howells * 1295d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1296d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1297d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1298d2ddc776SDavid Howells * 1299d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1300d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1301d2ddc776SDavid Howells */ 1302a38a7558SDavid Howells static int afs_dir_remove_link(struct afs_vnode *dvnode, struct dentry *dentry, 1303a38a7558SDavid Howells struct key *key) 1304d2ddc776SDavid Howells { 1305d2ddc776SDavid Howells int ret = 0; 1306d2ddc776SDavid Howells 1307d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1308d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1309d2ddc776SDavid Howells 131030062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 131130062bd1SDavid Howells /* Already done */ 1312a38a7558SDavid Howells } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1313a38a7558SDavid Howells write_seqlock(&vnode->cb_lock); 1314440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1315440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1316440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1317a38a7558SDavid Howells __afs_break_callback(vnode); 1318440fbc3aSDavid Howells } 1319a38a7558SDavid Howells write_sequnlock(&vnode->cb_lock); 1320440fbc3aSDavid Howells ret = 0; 1321440fbc3aSDavid Howells } else { 1322a38a7558SDavid Howells afs_break_callback(vnode); 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; 134679ddbfa5SDavid Howells bool need_rehash = false; 1347d2ddc776SDavid Howells int ret; 1348d2ddc776SDavid Howells 13493b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1350d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1351d2ddc776SDavid Howells 1352d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1353d2ddc776SDavid Howells return -ENAMETOOLONG; 1354d2ddc776SDavid Howells 1355a58823acSDavid Howells ret = -ENOMEM; 1356a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1357a58823acSDavid Howells if (!scb) 1358a58823acSDavid Howells goto error; 1359a58823acSDavid Howells 1360d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1361d2ddc776SDavid Howells if (IS_ERR(key)) { 1362d2ddc776SDavid Howells ret = PTR_ERR(key); 1363a58823acSDavid Howells goto error_scb; 1364d2ddc776SDavid Howells } 1365d2ddc776SDavid Howells 1366d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1367d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1368d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1369d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1370d2ddc776SDavid Howells if (ret < 0) 1371d2ddc776SDavid Howells goto error_key; 1372d2ddc776SDavid Howells } 1373d2ddc776SDavid Howells 137479ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 137579ddbfa5SDavid Howells if (vnode && d_count(dentry) > 1) { 137679ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 137779ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 137879ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 137979ddbfa5SDavid Howells ret = afs_sillyrename(dvnode, vnode, dentry, key); 138079ddbfa5SDavid Howells goto error_key; 138179ddbfa5SDavid Howells } 138279ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 138379ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 138479ddbfa5SDavid Howells __d_drop(dentry); 138579ddbfa5SDavid Howells need_rehash = true; 138679ddbfa5SDavid Howells } 138779ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 138879ddbfa5SDavid Howells 1389d2ddc776SDavid Howells ret = -ERESTARTSYS; 139020b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1391a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1392a38a7558SDavid Howells afs_dataversion_t data_version_2 = vnode->status.data_version; 1393a58823acSDavid Howells 1394d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 139568251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1396a38a7558SDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 139730062bd1SDavid Howells 139830062bd1SDavid Howells if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && 139930062bd1SDavid Howells !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { 140030062bd1SDavid Howells yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, 1401a58823acSDavid Howells &scb[0], &scb[1]); 140230062bd1SDavid Howells if (fc.ac.error != -ECONNABORTED || 140330062bd1SDavid Howells fc.ac.abort_code != RXGEN_OPCODE) 140430062bd1SDavid Howells continue; 140530062bd1SDavid Howells set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); 140630062bd1SDavid Howells } 140730062bd1SDavid Howells 1408a58823acSDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, false, &scb[0]); 1409d2ddc776SDavid Howells } 1410d2ddc776SDavid Howells 1411a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1412a58823acSDavid Howells &data_version, &scb[0]); 1413a38a7558SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, 1414a38a7558SDavid Howells &data_version_2, &scb[1]); 1415d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1416a38a7558SDavid Howells if (ret == 0 && !(scb[1].have_status || scb[1].have_error)) 1417a38a7558SDavid Howells ret = afs_dir_remove_link(dvnode, dentry, key); 141863a4681fSDavid Howells if (ret == 0 && 141963a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 142063a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 142163a4681fSDavid Howells afs_edit_dir_for_unlink); 1422d2ddc776SDavid Howells } 1423d2ddc776SDavid Howells 142479ddbfa5SDavid Howells if (need_rehash && ret < 0 && ret != -ENOENT) 142579ddbfa5SDavid Howells d_rehash(dentry); 142679ddbfa5SDavid Howells 1427d2ddc776SDavid Howells error_key: 1428260a9803SDavid Howells key_put(key); 1429a58823acSDavid Howells error_scb: 1430a58823acSDavid Howells kfree(scb); 1431260a9803SDavid Howells error: 1432260a9803SDavid Howells _leave(" = %d", ret); 1433260a9803SDavid Howells return ret; 1434260a9803SDavid Howells } 1435260a9803SDavid Howells 1436260a9803SDavid Howells /* 1437260a9803SDavid Howells * create a regular file on an AFS filesystem 1438260a9803SDavid Howells */ 14394acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1440ebfc3b49SAl Viro bool excl) 1441260a9803SDavid Howells { 1442d2ddc776SDavid Howells struct afs_fs_cursor fc; 1443a58823acSDavid Howells struct afs_status_cb *scb; 144443dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1445d2ddc776SDavid Howells struct afs_fid newfid; 1446260a9803SDavid Howells struct key *key; 1447260a9803SDavid Howells int ret; 1448260a9803SDavid Howells 1449d2ddc776SDavid Howells mode |= S_IFREG; 1450260a9803SDavid Howells 14513b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho,", 1452a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1453260a9803SDavid Howells 1454d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1455d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1456d2ddc776SDavid Howells goto error; 1457d2ddc776SDavid Howells 1458260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1459260a9803SDavid Howells if (IS_ERR(key)) { 1460260a9803SDavid Howells ret = PTR_ERR(key); 1461260a9803SDavid Howells goto error; 1462260a9803SDavid Howells } 1463260a9803SDavid Howells 1464a58823acSDavid Howells ret = -ENOMEM; 1465a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1466a58823acSDavid Howells if (!scb) 1467a58823acSDavid Howells goto error_scb; 1468a58823acSDavid Howells 1469d2ddc776SDavid Howells ret = -ERESTARTSYS; 147020b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1471a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1472a58823acSDavid Howells 1473d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 147468251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1475a58823acSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1476a58823acSDavid Howells &scb[0], &newfid, &scb[1]); 1477d2ddc776SDavid Howells } 1478d2ddc776SDavid Howells 1479a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1480a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1481a58823acSDavid Howells &data_version, &scb[0]); 1482a58823acSDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]); 1483d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1484260a9803SDavid Howells if (ret < 0) 1485d2ddc776SDavid Howells goto error_key; 14864433b691SDavid Howells } else { 14874433b691SDavid Howells goto error_key; 1488260a9803SDavid Howells } 1489260a9803SDavid Howells 149063a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 149163a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 149263a4681fSDavid Howells afs_edit_dir_for_create); 149363a4681fSDavid Howells 1494a58823acSDavid Howells kfree(scb); 1495260a9803SDavid Howells key_put(key); 1496260a9803SDavid Howells _leave(" = 0"); 1497260a9803SDavid Howells return 0; 1498260a9803SDavid Howells 1499a58823acSDavid Howells error_scb: 1500a58823acSDavid Howells kfree(scb); 1501d2ddc776SDavid Howells error_key: 1502260a9803SDavid Howells key_put(key); 1503260a9803SDavid Howells error: 1504260a9803SDavid Howells d_drop(dentry); 1505260a9803SDavid Howells _leave(" = %d", ret); 1506260a9803SDavid Howells return ret; 1507260a9803SDavid Howells } 1508260a9803SDavid Howells 1509260a9803SDavid Howells /* 1510260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1511260a9803SDavid Howells */ 1512260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1513260a9803SDavid Howells struct dentry *dentry) 1514260a9803SDavid Howells { 1515d2ddc776SDavid Howells struct afs_fs_cursor fc; 1516a58823acSDavid Howells struct afs_status_cb *scb; 1517a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1518a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1519260a9803SDavid Howells struct key *key; 1520260a9803SDavid Howells int ret; 1521260a9803SDavid Howells 15223b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1523260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1524260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1525a455589fSAl Viro dentry); 1526260a9803SDavid Howells 1527d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1528d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1529d2ddc776SDavid Howells goto error; 1530d2ddc776SDavid Howells 1531a58823acSDavid Howells ret = -ENOMEM; 1532a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1533a58823acSDavid Howells if (!scb) 1534a58823acSDavid Howells goto error; 1535a58823acSDavid Howells 1536260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1537260a9803SDavid Howells if (IS_ERR(key)) { 1538260a9803SDavid Howells ret = PTR_ERR(key); 1539a58823acSDavid Howells goto error_scb; 1540260a9803SDavid Howells } 1541260a9803SDavid Howells 1542d2ddc776SDavid Howells ret = -ERESTARTSYS; 154320b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1544a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1545a58823acSDavid Howells 1546d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1547d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1548bc1527dcSDavid Howells goto error_key; 1549d2ddc776SDavid Howells } 1550260a9803SDavid Howells 1551d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 155268251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 155368251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 1554a58823acSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, 1555a58823acSDavid Howells &scb[0], &scb[1]); 1556d2ddc776SDavid Howells } 1557d2ddc776SDavid Howells 1558a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1559a58823acSDavid Howells &data_version, &scb[0]); 1560a58823acSDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2, 1561a58823acSDavid Howells NULL, &scb[1]); 15627de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1563260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1564d2ddc776SDavid Howells 1565d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1566d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1567d2ddc776SDavid Howells if (ret < 0) 1568d2ddc776SDavid Howells goto error_key; 15694433b691SDavid Howells } else { 15704433b691SDavid Howells goto error_key; 1571d2ddc776SDavid Howells } 1572d2ddc776SDavid Howells 157363a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 157463a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 157563a4681fSDavid Howells afs_edit_dir_for_link); 157663a4681fSDavid Howells 1577260a9803SDavid Howells key_put(key); 1578a58823acSDavid Howells kfree(scb); 1579260a9803SDavid Howells _leave(" = 0"); 1580260a9803SDavid Howells return 0; 1581260a9803SDavid Howells 1582d2ddc776SDavid Howells error_key: 1583260a9803SDavid Howells key_put(key); 1584a58823acSDavid Howells error_scb: 1585a58823acSDavid Howells kfree(scb); 1586260a9803SDavid Howells error: 1587260a9803SDavid Howells d_drop(dentry); 1588260a9803SDavid Howells _leave(" = %d", ret); 1589260a9803SDavid Howells return ret; 1590260a9803SDavid Howells } 1591260a9803SDavid Howells 1592260a9803SDavid Howells /* 1593260a9803SDavid Howells * create a symlink in an AFS filesystem 1594260a9803SDavid Howells */ 1595260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1596260a9803SDavid Howells const char *content) 1597260a9803SDavid Howells { 1598d2ddc776SDavid Howells struct afs_fs_cursor fc; 1599a58823acSDavid Howells struct afs_status_cb *scb; 1600d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1601d2ddc776SDavid Howells struct afs_fid newfid; 1602260a9803SDavid Howells struct key *key; 1603260a9803SDavid Howells int ret; 1604260a9803SDavid Howells 16053b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1606a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1607260a9803SDavid Howells content); 1608260a9803SDavid Howells 1609d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1610d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1611d2ddc776SDavid Howells goto error; 1612d2ddc776SDavid Howells 1613260a9803SDavid Howells ret = -EINVAL; 161445222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1615260a9803SDavid Howells goto error; 1616260a9803SDavid Howells 1617a58823acSDavid Howells ret = -ENOMEM; 1618a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1619a58823acSDavid Howells if (!scb) 1620a58823acSDavid Howells goto error; 1621a58823acSDavid Howells 1622260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1623260a9803SDavid Howells if (IS_ERR(key)) { 1624260a9803SDavid Howells ret = PTR_ERR(key); 1625a58823acSDavid Howells goto error_scb; 1626260a9803SDavid Howells } 1627260a9803SDavid Howells 1628d2ddc776SDavid Howells ret = -ERESTARTSYS; 162920b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key, true)) { 1630a58823acSDavid Howells afs_dataversion_t data_version = dvnode->status.data_version + 1; 1631a58823acSDavid Howells 1632d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 163368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 1634a58823acSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, content, 1635a58823acSDavid Howells &scb[0], &newfid, &scb[1]); 1636d2ddc776SDavid Howells } 1637d2ddc776SDavid Howells 1638a58823acSDavid Howells afs_check_for_remote_deletion(&fc, dvnode); 1639a58823acSDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break, 1640a58823acSDavid Howells &data_version, &scb[0]); 1641a58823acSDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]); 1642d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1643260a9803SDavid Howells if (ret < 0) 1644d2ddc776SDavid Howells goto error_key; 16454433b691SDavid Howells } else { 16464433b691SDavid Howells goto error_key; 1647260a9803SDavid Howells } 1648260a9803SDavid Howells 164963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 165063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 165163a4681fSDavid Howells afs_edit_dir_for_symlink); 165263a4681fSDavid Howells 1653260a9803SDavid Howells key_put(key); 1654a58823acSDavid Howells kfree(scb); 1655260a9803SDavid Howells _leave(" = 0"); 1656260a9803SDavid Howells return 0; 1657260a9803SDavid Howells 1658d2ddc776SDavid Howells error_key: 1659260a9803SDavid Howells key_put(key); 1660a58823acSDavid Howells error_scb: 1661a58823acSDavid Howells kfree(scb); 1662260a9803SDavid Howells error: 1663260a9803SDavid Howells d_drop(dentry); 1664260a9803SDavid Howells _leave(" = %d", ret); 1665260a9803SDavid Howells return ret; 1666260a9803SDavid Howells } 1667260a9803SDavid Howells 1668260a9803SDavid Howells /* 1669260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1670260a9803SDavid Howells */ 1671260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 16721cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 16731cd66c93SMiklos Szeredi unsigned int flags) 1674260a9803SDavid Howells { 1675d2ddc776SDavid Howells struct afs_fs_cursor fc; 1676a58823acSDavid Howells struct afs_status_cb *scb; 1677260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 167879ddbfa5SDavid Howells struct dentry *tmp = NULL, *rehash = NULL; 167979ddbfa5SDavid Howells struct inode *new_inode; 1680260a9803SDavid Howells struct key *key; 168163a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1682260a9803SDavid Howells int ret; 1683260a9803SDavid Howells 16841cd66c93SMiklos Szeredi if (flags) 16851cd66c93SMiklos Szeredi return -EINVAL; 16861cd66c93SMiklos Szeredi 168779ddbfa5SDavid Howells /* Don't allow silly-rename files be moved around. */ 168879ddbfa5SDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 168979ddbfa5SDavid Howells return -EINVAL; 169079ddbfa5SDavid Howells 16912b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1692260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1693260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1694260a9803SDavid Howells 16953b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1696260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1697260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1698260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1699a455589fSAl Viro new_dentry); 1700260a9803SDavid Howells 1701a58823acSDavid Howells ret = -ENOMEM; 1702a58823acSDavid Howells scb = kcalloc(2, sizeof(struct afs_status_cb), GFP_KERNEL); 1703a58823acSDavid Howells if (!scb) 1704a58823acSDavid Howells goto error; 1705a58823acSDavid Howells 1706260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1707260a9803SDavid Howells if (IS_ERR(key)) { 1708260a9803SDavid Howells ret = PTR_ERR(key); 1709a58823acSDavid Howells goto error_scb; 1710260a9803SDavid Howells } 1711260a9803SDavid Howells 171279ddbfa5SDavid Howells /* For non-directories, check whether the target is busy and if so, 171379ddbfa5SDavid Howells * make a copy of the dentry and then do a silly-rename. If the 171479ddbfa5SDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 171579ddbfa5SDavid Howells * new target. 171679ddbfa5SDavid Howells */ 171779ddbfa5SDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 171879ddbfa5SDavid Howells /* To prevent any new references to the target during the 171979ddbfa5SDavid Howells * rename, we unhash the dentry in advance. 172079ddbfa5SDavid Howells */ 172179ddbfa5SDavid Howells if (!d_unhashed(new_dentry)) { 172279ddbfa5SDavid Howells d_drop(new_dentry); 172379ddbfa5SDavid Howells rehash = new_dentry; 172479ddbfa5SDavid Howells } 172579ddbfa5SDavid Howells 172679ddbfa5SDavid Howells if (d_count(new_dentry) > 2) { 172779ddbfa5SDavid Howells /* copy the target dentry's name */ 172879ddbfa5SDavid Howells ret = -ENOMEM; 172979ddbfa5SDavid Howells tmp = d_alloc(new_dentry->d_parent, 173079ddbfa5SDavid Howells &new_dentry->d_name); 173179ddbfa5SDavid Howells if (!tmp) 173279ddbfa5SDavid Howells goto error_rehash; 173379ddbfa5SDavid Howells 173479ddbfa5SDavid Howells ret = afs_sillyrename(new_dvnode, 173579ddbfa5SDavid Howells AFS_FS_I(d_inode(new_dentry)), 173679ddbfa5SDavid Howells new_dentry, key); 173779ddbfa5SDavid Howells if (ret) 173879ddbfa5SDavid Howells goto error_rehash; 173979ddbfa5SDavid Howells 174079ddbfa5SDavid Howells new_dentry = tmp; 174179ddbfa5SDavid Howells rehash = NULL; 174279ddbfa5SDavid Howells new_negative = true; 174379ddbfa5SDavid Howells } 174479ddbfa5SDavid Howells } 174579ddbfa5SDavid Howells 1746d2ddc776SDavid Howells ret = -ERESTARTSYS; 174720b8391fSDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) { 1748a58823acSDavid Howells afs_dataversion_t orig_data_version; 1749a58823acSDavid Howells afs_dataversion_t new_data_version; 1750a58823acSDavid Howells struct afs_status_cb *new_scb = &scb[1]; 1751a58823acSDavid Howells 1752a58823acSDavid Howells orig_data_version = orig_dvnode->status.data_version + 1; 1753a58823acSDavid Howells 1754d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1755d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1756d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 175779ddbfa5SDavid Howells goto error_rehash; 1758d2ddc776SDavid Howells } 1759a58823acSDavid Howells new_data_version = new_dvnode->status.data_version; 1760a58823acSDavid Howells } else { 1761a58823acSDavid Howells new_data_version = orig_data_version; 1762a58823acSDavid Howells new_scb = &scb[0]; 1763d2ddc776SDavid Howells } 1764a58823acSDavid Howells 1765d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 176668251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 176768251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1768d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 176963a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 1770a58823acSDavid Howells &scb[0], new_scb); 1771d2ddc776SDavid Howells } 1772d2ddc776SDavid Howells 1773a58823acSDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break, 1774a58823acSDavid Howells &orig_data_version, &scb[0]); 1775a58823acSDavid Howells if (new_dvnode != orig_dvnode) { 1776a58823acSDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2, 1777a58823acSDavid Howells &new_data_version, &scb[1]); 1778d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1779a58823acSDavid Howells } 1780d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1781260a9803SDavid Howells if (ret < 0) 178279ddbfa5SDavid Howells goto error_rehash; 1783d2ddc776SDavid Howells } 1784d2ddc776SDavid Howells 178563a4681fSDavid Howells if (ret == 0) { 178679ddbfa5SDavid Howells if (rehash) 178779ddbfa5SDavid Howells d_rehash(rehash); 178863a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 178963a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 179079ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 179163a4681fSDavid Howells 179263a4681fSDavid Howells if (!new_negative && 179363a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 179463a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 179579ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 179663a4681fSDavid Howells 179763a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 179863a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 179979ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 180079ddbfa5SDavid Howells 180179ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 180279ddbfa5SDavid Howells if (new_inode) { 180379ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 180479ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 180579ddbfa5SDavid Howells drop_nlink(new_inode); 180679ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 180779ddbfa5SDavid Howells } 180879ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 180979ddbfa5SDavid Howells goto error_tmp; 181063a4681fSDavid Howells } 181163a4681fSDavid Howells 181279ddbfa5SDavid Howells error_rehash: 181379ddbfa5SDavid Howells if (rehash) 181479ddbfa5SDavid Howells d_rehash(rehash); 181579ddbfa5SDavid Howells error_tmp: 181679ddbfa5SDavid Howells if (tmp) 181779ddbfa5SDavid Howells dput(tmp); 1818260a9803SDavid Howells key_put(key); 1819a58823acSDavid Howells error_scb: 1820a58823acSDavid Howells kfree(scb); 1821260a9803SDavid Howells error: 1822260a9803SDavid Howells _leave(" = %d", ret); 1823260a9803SDavid Howells return ret; 1824260a9803SDavid Howells } 1825f3ddee8dSDavid Howells 1826f3ddee8dSDavid Howells /* 1827f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1828f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1829f3ddee8dSDavid Howells */ 1830f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1831f3ddee8dSDavid Howells { 1832f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1833f3ddee8dSDavid Howells 18343b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1835f3ddee8dSDavid Howells 1836f3ddee8dSDavid Howells set_page_private(page, 0); 1837f3ddee8dSDavid Howells ClearPagePrivate(page); 1838f3ddee8dSDavid Howells 1839f3ddee8dSDavid Howells /* The directory will need reloading. */ 1840f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1841f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1842f3ddee8dSDavid Howells return 1; 1843f3ddee8dSDavid Howells } 1844f3ddee8dSDavid Howells 1845f3ddee8dSDavid Howells /* 1846f3ddee8dSDavid Howells * invalidate part or all of a page 1847f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1848f3ddee8dSDavid Howells * the entire page) 1849f3ddee8dSDavid Howells */ 1850f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1851f3ddee8dSDavid Howells unsigned int length) 1852f3ddee8dSDavid Howells { 1853f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1854f3ddee8dSDavid Howells 1855f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1856f3ddee8dSDavid Howells 1857f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1858f3ddee8dSDavid Howells 1859f3ddee8dSDavid Howells /* The directory will need reloading. */ 1860f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1861f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1862f3ddee8dSDavid Howells 1863f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1864f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1865f3ddee8dSDavid Howells set_page_private(page, 0); 1866f3ddee8dSDavid Howells ClearPagePrivate(page); 1867f3ddee8dSDavid Howells } 1868f3ddee8dSDavid Howells } 1869