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" 214ea219a8SDavid Howells #include "xdr_fs.h" 221da177e4SLinus Torvalds 23260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2400cd8dd3SAl Viro unsigned int flags); 251da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 261bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 270b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 28fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 2979ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode); 305cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 315cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 32ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 33afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 344acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 35ebfc3b49SAl Viro bool excl); 3618bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 37260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 38260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 39260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 40260a9803SDavid Howells struct dentry *dentry); 41260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 42260a9803SDavid Howells const char *content); 43260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 441cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 451cd66c93SMiklos Szeredi unsigned int flags); 46f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 47f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 48f3ddee8dSDavid Howells unsigned int length); 49f3ddee8dSDavid Howells 50f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 51f3ddee8dSDavid Howells { 52f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 53f3ddee8dSDavid Howells } 541da177e4SLinus Torvalds 554b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 561da177e4SLinus Torvalds .open = afs_dir_open, 5700d3b7a4SDavid Howells .release = afs_release, 5829884effSAl Viro .iterate_shared = afs_readdir, 59e8d6c554SDavid Howells .lock = afs_lock, 603222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 611da177e4SLinus Torvalds }; 621da177e4SLinus Torvalds 63754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 64260a9803SDavid Howells .create = afs_create, 65260a9803SDavid Howells .lookup = afs_lookup, 66260a9803SDavid Howells .link = afs_link, 67260a9803SDavid Howells .unlink = afs_unlink, 68260a9803SDavid Howells .symlink = afs_symlink, 69260a9803SDavid Howells .mkdir = afs_mkdir, 70260a9803SDavid Howells .rmdir = afs_rmdir, 712773bf00SMiklos Szeredi .rename = afs_rename, 7200d3b7a4SDavid Howells .permission = afs_permission, 73416351f2SDavid Howells .getattr = afs_getattr, 7431143d5dSDavid Howells .setattr = afs_setattr, 75d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 761da177e4SLinus Torvalds }; 771da177e4SLinus Torvalds 78f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 79f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 80f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 81f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 82f3ddee8dSDavid Howells }; 83f3ddee8dSDavid Howells 84d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 851da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 861da177e4SLinus Torvalds .d_delete = afs_d_delete, 87260a9803SDavid Howells .d_release = afs_d_release, 88d18610b0SDavid Howells .d_automount = afs_d_automount, 8979ddbfa5SDavid Howells .d_iput = afs_d_iput, 901da177e4SLinus Torvalds }; 911da177e4SLinus Torvalds 925cf9dd55SDavid Howells struct afs_lookup_one_cookie { 935cf9dd55SDavid Howells struct dir_context ctx; 945cf9dd55SDavid Howells struct qstr name; 955cf9dd55SDavid Howells bool found; 965cf9dd55SDavid Howells struct afs_fid fid; 975cf9dd55SDavid Howells }; 985cf9dd55SDavid Howells 99260a9803SDavid Howells struct afs_lookup_cookie { 1001bbae9f8SAl Viro struct dir_context ctx; 1011bbae9f8SAl Viro struct qstr name; 1025cf9dd55SDavid Howells bool found; 1035cf9dd55SDavid Howells bool one_only; 1045cf9dd55SDavid Howells unsigned short nr_fids; 1055cf9dd55SDavid Howells struct afs_file_status *statuses; 1065cf9dd55SDavid Howells struct afs_callback *callbacks; 1075cf9dd55SDavid Howells struct afs_fid fids[50]; 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * check that a directory page is valid 1121da177e4SLinus Torvalds */ 113f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 114f3ddee8dSDavid Howells loff_t i_size) 1151da177e4SLinus Torvalds { 11600317636SDavid Howells struct afs_xdr_dir_page *dbuf; 117f3ddee8dSDavid Howells loff_t latter, off; 1181da177e4SLinus Torvalds int tmp, qty; 1191da177e4SLinus Torvalds 120dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 121dab17c1aSDavid Howells * we must take care because the directory may change size under us. 122dab17c1aSDavid Howells */ 123dab17c1aSDavid Howells off = page_offset(page); 124dab17c1aSDavid Howells if (i_size <= off) 125dab17c1aSDavid Howells goto checked; 126dab17c1aSDavid Howells 127dab17c1aSDavid Howells latter = i_size - off; 1281da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1291da177e4SLinus Torvalds qty = PAGE_SIZE; 1301da177e4SLinus Torvalds else 1311da177e4SLinus Torvalds qty = latter; 13200317636SDavid Howells qty /= sizeof(union afs_xdr_dir_block); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* check them */ 13563a4681fSDavid Howells dbuf = kmap(page); 1361da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 13700317636SDavid Howells if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 138dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 139f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 14000317636SDavid Howells ntohs(dbuf->blocks[tmp].hdr.magic)); 141f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 14263a4681fSDavid Howells kunmap(page); 143f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1441da177e4SLinus Torvalds goto error; 1451da177e4SLinus Torvalds } 14663a4681fSDavid Howells 14763a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 14863a4681fSDavid Howells * use string functions on it. The filenames in the page 14963a4681fSDavid Howells * *should* be NUL-terminated anyway. 15063a4681fSDavid Howells */ 15163a4681fSDavid Howells ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 15463a4681fSDavid Howells kunmap(page); 15563a4681fSDavid Howells 156dab17c1aSDavid Howells checked: 157f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 158be5b82dbSAl Viro return true; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds error: 161be5b82dbSAl Viro return false; 162ec26815aSDavid Howells } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* 165445b1028SDavid Howells * Check the contents of a directory that we've just read. 166445b1028SDavid Howells */ 167445b1028SDavid Howells static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) 168445b1028SDavid Howells { 169445b1028SDavid Howells struct afs_xdr_dir_page *dbuf; 170445b1028SDavid Howells unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); 171445b1028SDavid Howells 172445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) 173445b1028SDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) 174445b1028SDavid Howells goto bad; 175445b1028SDavid Howells return true; 176445b1028SDavid Howells 177445b1028SDavid Howells bad: 178445b1028SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", 179445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 180445b1028SDavid Howells req->file_size, req->len, req->actual_len, req->remain); 181445b1028SDavid Howells pr_warn("DIR %llx %x %x %x\n", 182445b1028SDavid Howells req->pos, req->index, req->nr_pages, req->offset); 183445b1028SDavid Howells 184445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) { 185445b1028SDavid Howells dbuf = kmap(req->pages[i]); 186445b1028SDavid Howells for (j = 0; j < qty; j++) { 187445b1028SDavid Howells union afs_xdr_dir_block *block = &dbuf->blocks[j]; 188445b1028SDavid Howells 189445b1028SDavid Howells pr_warn("[%02x] %32phN\n", i * qty + j, block); 190445b1028SDavid Howells } 191445b1028SDavid Howells kunmap(req->pages[i]); 192445b1028SDavid Howells } 193445b1028SDavid Howells return false; 194445b1028SDavid Howells } 195445b1028SDavid Howells 196445b1028SDavid Howells /* 1971da177e4SLinus Torvalds * open an AFS directory file 1981da177e4SLinus Torvalds */ 1991da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2001da177e4SLinus Torvalds { 2011da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2021da177e4SLinus Torvalds 20300317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 20400317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2051da177e4SLinus Torvalds 20608e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2071da177e4SLinus Torvalds return -ENOENT; 2081da177e4SLinus Torvalds 20900d3b7a4SDavid Howells return afs_open(inode, file); 210ec26815aSDavid Howells } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* 213f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 214f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 215f3ddee8dSDavid Howells * get reclaimed during the iteration. 216f3ddee8dSDavid Howells */ 217f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 218b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 219f3ddee8dSDavid Howells { 220f3ddee8dSDavid Howells struct afs_read *req; 221f3ddee8dSDavid Howells loff_t i_size; 222f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 223f3ddee8dSDavid Howells int ret = -ENOMEM; 224f3ddee8dSDavid Howells 225f3ddee8dSDavid Howells retry: 226f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 227f3ddee8dSDavid Howells if (i_size < 2048) 228f51375cdSDavid Howells return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); 229f51375cdSDavid Howells if (i_size > 2048 * 1024) { 230f51375cdSDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 231f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 232f51375cdSDavid Howells } 233f3ddee8dSDavid Howells 234f3ddee8dSDavid Howells _enter("%llu", i_size); 235f3ddee8dSDavid Howells 236f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 237f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 238f3ddee8dSDavid Howells */ 239f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 240f3ddee8dSDavid Howells nr_inline = nr_pages; 241f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 242f3ddee8dSDavid Howells nr_inline = 0; 243f3ddee8dSDavid Howells 244f3ddee8dSDavid Howells req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, 245f3ddee8dSDavid Howells GFP_KERNEL); 246f3ddee8dSDavid Howells if (!req) 247f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 248f3ddee8dSDavid Howells 249f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 250f3ddee8dSDavid Howells req->nr_pages = nr_pages; 251f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 252f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 253f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 254f3ddee8dSDavid Howells if (nr_inline > 0) { 255f3ddee8dSDavid Howells req->pages = req->array; 256f3ddee8dSDavid Howells } else { 257f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 258f3ddee8dSDavid Howells GFP_KERNEL); 259f3ddee8dSDavid Howells if (!req->pages) 260f3ddee8dSDavid Howells goto error; 261f3ddee8dSDavid Howells } 262f3ddee8dSDavid Howells 263f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 264f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 265f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 266f3ddee8dSDavid Howells * need to reread the entire directory contents. 267f3ddee8dSDavid Howells */ 268f3ddee8dSDavid Howells i = 0; 269f3ddee8dSDavid Howells do { 270f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 271f3ddee8dSDavid Howells req->nr_pages - i, 272f3ddee8dSDavid Howells req->pages + i); 273f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 274f3ddee8dSDavid Howells if (n == 0) { 275f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 276f3ddee8dSDavid Howells 277f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 278f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 279f3ddee8dSDavid Howells 280f3ddee8dSDavid Howells ret = -ENOMEM; 281f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 282f3ddee8dSDavid Howells if (!req->pages[i]) 283f3ddee8dSDavid Howells goto error; 284f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 285f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 286f3ddee8dSDavid Howells i, gfp); 287f3ddee8dSDavid Howells if (ret < 0) 288f3ddee8dSDavid Howells goto error; 289f3ddee8dSDavid Howells 290f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 291f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 292f3ddee8dSDavid Howells unlock_page(req->pages[i]); 293f3ddee8dSDavid Howells i++; 294f3ddee8dSDavid Howells } else { 295f3ddee8dSDavid Howells i += n; 296f3ddee8dSDavid Howells } 297f3ddee8dSDavid Howells } while (i < req->nr_pages); 298f3ddee8dSDavid Howells 299f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 300f3ddee8dSDavid Howells * races. 301f3ddee8dSDavid Howells */ 302f3ddee8dSDavid Howells ret = -ERESTARTSYS; 303b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 304b61f7dcfSDavid Howells goto error; 305f3ddee8dSDavid Howells 306f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 307f3ddee8dSDavid Howells goto success; 308f3ddee8dSDavid Howells 309b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 310b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 311b61f7dcfSDavid Howells goto error; 312b61f7dcfSDavid Howells 313b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 31499987c56SDavid Howells trace_afs_reload_dir(dvnode); 315f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 316f3ddee8dSDavid Howells if (ret < 0) 317b61f7dcfSDavid Howells goto error_unlock; 318f3ddee8dSDavid Howells 319f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 320f3ddee8dSDavid Howells 321f3ddee8dSDavid Howells if (req->len < req->file_size) 322f3ddee8dSDavid Howells goto content_has_grown; 323f3ddee8dSDavid Howells 324f3ddee8dSDavid Howells /* Validate the data we just read. */ 325f3ddee8dSDavid Howells ret = -EIO; 326445b1028SDavid Howells if (!afs_dir_check_pages(dvnode, req)) 327b61f7dcfSDavid Howells goto error_unlock; 328f3ddee8dSDavid Howells 329f3ddee8dSDavid Howells // TODO: Trim excess pages 330f3ddee8dSDavid Howells 331f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 332f3ddee8dSDavid Howells } 333f3ddee8dSDavid Howells 334b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 335f3ddee8dSDavid Howells success: 336f3ddee8dSDavid Howells return req; 337f3ddee8dSDavid Howells 338f3ddee8dSDavid Howells error_unlock: 339b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 340f3ddee8dSDavid Howells error: 341f3ddee8dSDavid Howells afs_put_read(req); 342f3ddee8dSDavid Howells _leave(" = %d", ret); 343f3ddee8dSDavid Howells return ERR_PTR(ret); 344f3ddee8dSDavid Howells 345f3ddee8dSDavid Howells content_has_grown: 346b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 347f3ddee8dSDavid Howells afs_put_read(req); 348f3ddee8dSDavid Howells goto retry; 349f3ddee8dSDavid Howells } 350f3ddee8dSDavid Howells 351f3ddee8dSDavid Howells /* 3521da177e4SLinus Torvalds * deal with one block in an AFS directory 3531da177e4SLinus Torvalds */ 354f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 355f51375cdSDavid Howells struct dir_context *ctx, 35600317636SDavid Howells union afs_xdr_dir_block *block, 3571bbae9f8SAl Viro unsigned blkoff) 3581da177e4SLinus Torvalds { 35900317636SDavid Howells union afs_xdr_dirent *dire; 3601da177e4SLinus Torvalds unsigned offset, next, curr; 3611da177e4SLinus Torvalds size_t nlen; 3621bbae9f8SAl Viro int tmp; 3631da177e4SLinus Torvalds 3641bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3651da177e4SLinus Torvalds 36600317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3694ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3704ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3711da177e4SLinus Torvalds offset = next 3721da177e4SLinus Torvalds ) { 3731da177e4SLinus Torvalds next = offset + 1; 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 37600317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3771da177e4SLinus Torvalds (1 << (offset % 8)))) { 3785b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 37900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3801da177e4SLinus Torvalds if (offset >= curr) 3811bbae9f8SAl Viro ctx->pos = blkoff + 38200317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3831da177e4SLinus Torvalds continue; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* got a valid entry */ 3871da177e4SLinus Torvalds dire = &block->dirents[offset]; 3881da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3891da177e4SLinus Torvalds sizeof(*block) - 39000317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3911da177e4SLinus Torvalds 3925b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 39300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3941da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3951da177e4SLinus Torvalds nlen, dire->u.name); 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds /* work out where the next possible entry is */ 39800317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3994ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 4005b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4011da177e4SLinus Torvalds " %u travelled beyond end dir block" 4025b5e0928SAlexey Dobriyan " (len %u/%zu)", 40300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4041da177e4SLinus Torvalds offset, next, tmp, nlen); 405f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4061da177e4SLinus Torvalds } 40700317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 4081da177e4SLinus Torvalds (1 << (next % 8)))) { 4095b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4105b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 41100317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4121da177e4SLinus Torvalds offset, next, tmp, nlen); 413f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4165b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 41700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4181da177e4SLinus Torvalds next, tmp, nlen); 4191da177e4SLinus Torvalds next++; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* skip if starts before the current position */ 4231da177e4SLinus Torvalds if (offset < curr) 4241da177e4SLinus Torvalds continue; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /* found the next entry */ 4271bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4281da177e4SLinus Torvalds ntohl(dire->u.vnode), 4295cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4305cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4311bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4321da177e4SLinus Torvalds _leave(" = 0 [full]"); 4331da177e4SLinus Torvalds return 0; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 43600317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds _leave(" = 1 [more]"); 4401da177e4SLinus Torvalds return 1; 441ec26815aSDavid Howells } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 44408e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4451da177e4SLinus Torvalds */ 4461bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4471bbae9f8SAl Viro struct key *key) 4481da177e4SLinus Torvalds { 449f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 45000317636SDavid Howells struct afs_xdr_dir_page *dbuf; 45100317636SDavid Howells union afs_xdr_dir_block *dblock; 452f3ddee8dSDavid Howells struct afs_read *req; 4531da177e4SLinus Torvalds struct page *page; 4541da177e4SLinus Torvalds unsigned blkoff, limit; 4551da177e4SLinus Torvalds int ret; 4561da177e4SLinus Torvalds 4571bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4581da177e4SLinus Torvalds 45908e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4601da177e4SLinus Torvalds _leave(" = -ESTALE"); 4611da177e4SLinus Torvalds return -ESTALE; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 464f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 465f3ddee8dSDavid Howells if (IS_ERR(req)) 466f3ddee8dSDavid Howells return PTR_ERR(req); 467f3ddee8dSDavid Howells 4681da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 46900317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 47000317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4731da177e4SLinus Torvalds ret = 0; 474f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 47500317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4761da177e4SLinus Torvalds 477f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 478f3ddee8dSDavid Howells * to the LRU. 479f3ddee8dSDavid Howells */ 480f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 481f3ddee8dSDavid Howells if (!page) { 482f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 4831da177e4SLinus Torvalds break; 4841da177e4SLinus Torvalds } 485f3ddee8dSDavid Howells mark_page_accessed(page); 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4881da177e4SLinus Torvalds 489f3ddee8dSDavid Howells dbuf = kmap(page); 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4921da177e4SLinus Torvalds do { 4931da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 49400317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 495f51375cdSDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); 4961da177e4SLinus Torvalds if (ret != 1) { 497f3ddee8dSDavid Howells kunmap(page); 4981da177e4SLinus Torvalds goto out; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 50100317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 5021da177e4SLinus Torvalds 5031bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 5041da177e4SLinus Torvalds 505f3ddee8dSDavid Howells kunmap(page); 5061da177e4SLinus Torvalds ret = 0; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds out: 510b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 511f3ddee8dSDavid Howells afs_put_read(req); 5121da177e4SLinus Torvalds _leave(" = %d", ret); 5131da177e4SLinus Torvalds return ret; 514ec26815aSDavid Howells } 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* 5171da177e4SLinus Torvalds * read an AFS directory 5181da177e4SLinus Torvalds */ 5191bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5201da177e4SLinus Torvalds { 521215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 522ec26815aSDavid Howells } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* 5255cf9dd55SDavid Howells * Search the directory for a single name 5261da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5271da177e4SLinus Torvalds * uniquifier through dtype 5281da177e4SLinus Torvalds */ 5295cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 530ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5311da177e4SLinus Torvalds { 5325cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5335cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5341da177e4SLinus Torvalds 5351bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5361bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 537ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5381da177e4SLinus Torvalds 53908e0e7c8SDavid Howells /* insanity checks first */ 54000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 54100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 54208e0e7c8SDavid Howells 5431bbae9f8SAl Viro if (cookie->name.len != nlen || 5441bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5451da177e4SLinus Torvalds _leave(" = 0 [no]"); 5461da177e4SLinus Torvalds return 0; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds cookie->fid.vnode = ino; 5501da177e4SLinus Torvalds cookie->fid.unique = dtype; 5511da177e4SLinus Torvalds cookie->found = 1; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds _leave(" = -1 [found]"); 5541da177e4SLinus Torvalds return -1; 555ec26815aSDavid Howells } 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds /* 5585cf9dd55SDavid Howells * Do a lookup of a single name in a directory 559260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5601da177e4SLinus Torvalds */ 5615cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 56200d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 5631da177e4SLinus Torvalds { 5641bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5655cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5665cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5671bbae9f8SAl Viro .name = dentry->d_name, 5681bbae9f8SAl Viro .fid.vid = as->volume->vid 5691bbae9f8SAl Viro }; 5701da177e4SLinus Torvalds int ret; 5711da177e4SLinus Torvalds 572a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* search the directory */ 5751bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 5761da177e4SLinus Torvalds if (ret < 0) { 57708e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 57808e0e7c8SDavid Howells return ret; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds ret = -ENOENT; 5821da177e4SLinus Torvalds if (!cookie.found) { 58308e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58408e0e7c8SDavid Howells return -ENOENT; 58508e0e7c8SDavid Howells } 58608e0e7c8SDavid Howells 58708e0e7c8SDavid Howells *fid = cookie.fid; 5883b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 58908e0e7c8SDavid Howells return 0; 59008e0e7c8SDavid Howells } 59108e0e7c8SDavid Howells 59208e0e7c8SDavid Howells /* 5935cf9dd55SDavid Howells * search the directory for a name 5945cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5955cf9dd55SDavid Howells * uniquifier through dtype 5965cf9dd55SDavid Howells */ 5975cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5985cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5995cf9dd55SDavid Howells { 6005cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6015cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6025cf9dd55SDavid Howells int ret; 6035cf9dd55SDavid Howells 6045cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6055cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6065cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6075cf9dd55SDavid Howells 6085cf9dd55SDavid Howells /* insanity checks first */ 60900317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 61000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6115cf9dd55SDavid Howells 6125cf9dd55SDavid Howells if (cookie->found) { 6135cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6145cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6155cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6165cf9dd55SDavid Howells cookie->nr_fids++; 6175cf9dd55SDavid Howells } 6185cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6195cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 6205cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 6215cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 6225cf9dd55SDavid Howells cookie->found = 1; 6235cf9dd55SDavid Howells if (cookie->one_only) 6245cf9dd55SDavid Howells return -1; 6255cf9dd55SDavid Howells } 6265cf9dd55SDavid Howells 6275cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6285cf9dd55SDavid Howells _leave(" = %d", ret); 6295cf9dd55SDavid Howells return ret; 6305cf9dd55SDavid Howells } 6315cf9dd55SDavid Howells 6325cf9dd55SDavid Howells /* 6335cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 6345cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 6355cf9dd55SDavid Howells * asked for is returned. 6365cf9dd55SDavid Howells */ 6375cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6385cf9dd55SDavid Howells struct key *key) 6395cf9dd55SDavid Howells { 6405cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 6415cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 6425cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 6435cf9dd55SDavid Howells struct afs_iget_data data; 6445cf9dd55SDavid Howells struct afs_fs_cursor fc; 6455cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 6465cf9dd55SDavid Howells struct inode *inode = NULL; 6475cf9dd55SDavid Howells int ret, i; 6485cf9dd55SDavid Howells 6495cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6505cf9dd55SDavid Howells 6515cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6525cf9dd55SDavid Howells if (!cookie) 6535cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6545cf9dd55SDavid Howells 6555cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6565cf9dd55SDavid Howells cookie->name = dentry->d_name; 6575cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6585cf9dd55SDavid Howells 6595cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 6605cf9dd55SDavid Howells if (dvnode->cb_interest && 6615cf9dd55SDavid Howells dvnode->cb_interest->server && 6625cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 6635cf9dd55SDavid Howells cookie->one_only = true; 6645cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6655cf9dd55SDavid Howells 6665cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6675cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6685cf9dd55SDavid Howells 6695cf9dd55SDavid Howells /* search the directory */ 6705cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 6715cf9dd55SDavid Howells if (ret < 0) { 6725cf9dd55SDavid Howells inode = ERR_PTR(ret); 6735cf9dd55SDavid Howells goto out; 6745cf9dd55SDavid Howells } 6755cf9dd55SDavid Howells 6765cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6775cf9dd55SDavid Howells if (!cookie->found) 6785cf9dd55SDavid Howells goto out; 6795cf9dd55SDavid Howells 6805cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 6815cf9dd55SDavid Howells data.volume = dvnode->volume; 6825cf9dd55SDavid Howells data.fid = cookie->fids[0]; 6835cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 6845cf9dd55SDavid Howells if (inode) 6855cf9dd55SDavid Howells goto out; 6865cf9dd55SDavid Howells 6875cf9dd55SDavid Howells /* Need space for examining all the selected files */ 6885cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 6895cf9dd55SDavid Howells cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), 6905cf9dd55SDavid Howells GFP_KERNEL); 6915cf9dd55SDavid Howells if (!cookie->statuses) 6925cf9dd55SDavid Howells goto out; 6935cf9dd55SDavid Howells 6945cf9dd55SDavid Howells cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), 6955cf9dd55SDavid Howells GFP_KERNEL); 6965cf9dd55SDavid Howells if (!cookie->callbacks) 6975cf9dd55SDavid Howells goto out_s; 6985cf9dd55SDavid Howells 6995cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 7005cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 7015cf9dd55SDavid Howells * the whole operation. 7025cf9dd55SDavid Howells */ 7035cf9dd55SDavid Howells if (cookie->one_only) 7045cf9dd55SDavid Howells goto no_inline_bulk_status; 7055cf9dd55SDavid Howells 7065cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 7075cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7085cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7095cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 7105cf9dd55SDavid Howells &fc.cbi->server->flags)) { 7115cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 7125cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 7135cf9dd55SDavid Howells break; 7145cf9dd55SDavid Howells } 7155cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 7165cf9dd55SDavid Howells afs_v2net(dvnode), 7175cf9dd55SDavid Howells cookie->fids, 7185cf9dd55SDavid Howells cookie->statuses, 7195cf9dd55SDavid Howells cookie->callbacks, 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); 7425cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7435cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7445cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7455cf9dd55SDavid Howells afs_v2net(dvnode), 7465cf9dd55SDavid Howells cookie->fids, 7475cf9dd55SDavid Howells cookie->statuses, 7485cf9dd55SDavid Howells cookie->callbacks, 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++) 7615cf9dd55SDavid Howells cookie->statuses[i].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 */ 7675cf9dd55SDavid Howells if (cookie->statuses[0].abort_code != 0) 7685cf9dd55SDavid Howells inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); 7695cf9dd55SDavid Howells 7705cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 7715cf9dd55SDavid Howells struct inode *ti; 7725cf9dd55SDavid Howells 7735cf9dd55SDavid Howells if (cookie->statuses[i].abort_code != 0) 7745cf9dd55SDavid Howells continue; 7755cf9dd55SDavid Howells 7765cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 7775cf9dd55SDavid Howells &cookie->statuses[i], 7785cf9dd55SDavid Howells &cookie->callbacks[i], 7795cf9dd55SDavid Howells cbi); 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); 7905cf9dd55SDavid Howells kfree(cookie->callbacks); 7915cf9dd55SDavid Howells out_s: 7925cf9dd55SDavid Howells kfree(cookie->statuses); 7935cf9dd55SDavid Howells out: 7945cf9dd55SDavid Howells kfree(cookie); 7955cf9dd55SDavid Howells return inode; 7965cf9dd55SDavid Howells } 7975cf9dd55SDavid Howells 7985cf9dd55SDavid Howells /* 7996f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 8006f8880d8SDavid Howells */ 8016f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 8026f8880d8SDavid Howells struct key *key) 8036f8880d8SDavid Howells { 8046f8880d8SDavid Howells struct afs_sysnames *subs; 8056f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8066f8880d8SDavid Howells struct dentry *ret; 8076f8880d8SDavid Howells char *buf, *p, *name; 8086f8880d8SDavid Howells int len, i; 8096f8880d8SDavid Howells 8106f8880d8SDavid Howells _enter(""); 8116f8880d8SDavid Howells 8126f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8136f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8146f8880d8SDavid Howells if (!buf) 8156f8880d8SDavid Howells goto out_p; 8166f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8176f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8186f8880d8SDavid Howells p += dentry->d_name.len - 4; 8196f8880d8SDavid Howells } 8206f8880d8SDavid Howells 8216f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8226f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8236f8880d8SDavid Howells subs = net->sysnames; 8246f8880d8SDavid Howells refcount_inc(&subs->usage); 8256f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8266f8880d8SDavid Howells 8276f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8286f8880d8SDavid Howells name = subs->subs[i]; 8296f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8306f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8316f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8326f8880d8SDavid Howells goto out_s; 8336f8880d8SDavid Howells } 8346f8880d8SDavid Howells 8356f8880d8SDavid Howells strcpy(p, name); 8366f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8376f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8386f8880d8SDavid Howells goto out_s; 8396f8880d8SDavid Howells dput(ret); 8406f8880d8SDavid Howells } 8416f8880d8SDavid Howells 8426f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8436f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8446f8880d8SDavid Howells */ 8456f8880d8SDavid Howells ret = NULL; 8466f8880d8SDavid Howells out_s: 8476f8880d8SDavid Howells afs_put_sysnames(subs); 8486f8880d8SDavid Howells kfree(buf); 8496f8880d8SDavid Howells out_p: 8506f8880d8SDavid Howells key_put(key); 8516f8880d8SDavid Howells return ret; 8526f8880d8SDavid Howells } 8536f8880d8SDavid Howells 8546f8880d8SDavid Howells /* 85508e0e7c8SDavid Howells * look up an entry in a directory 85608e0e7c8SDavid Howells */ 857260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 85800cd8dd3SAl Viro unsigned int flags) 85908e0e7c8SDavid Howells { 8605cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 86108e0e7c8SDavid Howells struct inode *inode; 86234b2a88fSAl Viro struct dentry *d; 86300d3b7a4SDavid Howells struct key *key; 86408e0e7c8SDavid Howells int ret; 86508e0e7c8SDavid Howells 8663b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 8675cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 868260a9803SDavid Howells 8692b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 87008e0e7c8SDavid Howells 87145222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 87208e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 87308e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 87408e0e7c8SDavid Howells } 87508e0e7c8SDavid Howells 8765cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 87708e0e7c8SDavid Howells _leave(" = -ESTALE"); 87808e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 87908e0e7c8SDavid Howells } 88008e0e7c8SDavid Howells 8815cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 88200d3b7a4SDavid Howells if (IS_ERR(key)) { 88300d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 884e231c2eeSDavid Howells return ERR_CAST(key); 88500d3b7a4SDavid Howells } 88600d3b7a4SDavid Howells 8875cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 88808e0e7c8SDavid Howells if (ret < 0) { 88900d3b7a4SDavid Howells key_put(key); 890260a9803SDavid Howells _leave(" = %d [val]", ret); 8911da177e4SLinus Torvalds return ERR_PTR(ret); 8921da177e4SLinus Torvalds } 8931da177e4SLinus Torvalds 8946f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8956f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8966f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 8976f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 8986f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 8996f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 9006f8880d8SDavid Howells 901d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 9025cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 90334b2a88fSAl Viro key_put(key); 90434b2a88fSAl Viro if (inode == ERR_PTR(-ENOENT)) { 9055cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 90634b2a88fSAl Viro } else { 90734b2a88fSAl Viro dentry->d_fsdata = 90834b2a88fSAl Viro (void *)(unsigned long)dvnode->status.data_version; 909bec5eb61Swanglei } 91034b2a88fSAl Viro d = d_splice_alias(inode, dentry); 91134b2a88fSAl Viro if (!IS_ERR_OR_NULL(d)) 91234b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 91334b2a88fSAl Viro return d; 914ec26815aSDavid Howells } 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds /* 9171da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 9181da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 9191da177e4SLinus Torvalds * inode 9201da177e4SLinus Torvalds */ 9210b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 9221da177e4SLinus Torvalds { 923260a9803SDavid Howells struct afs_vnode *vnode, *dir; 924dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 9251da177e4SLinus Torvalds struct dentry *parent; 926c435ee34SDavid Howells struct inode *inode; 92700d3b7a4SDavid Howells struct key *key; 928a4ff7401SDavid Howells long dir_version, de_version; 9291da177e4SLinus Torvalds int ret; 9301da177e4SLinus Torvalds 9310b728e19SAl Viro if (flags & LOOKUP_RCU) 93234286d66SNick Piggin return -ECHILD; 93334286d66SNick Piggin 934c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9352b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 9363b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 937a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 938260a9803SDavid Howells vnode->flags); 939c435ee34SDavid Howells } else { 940a455589fSAl Viro _enter("{neg n=%pd}", dentry); 941c435ee34SDavid Howells } 9421da177e4SLinus Torvalds 943260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 94400d3b7a4SDavid Howells if (IS_ERR(key)) 94500d3b7a4SDavid Howells key = NULL; 94600d3b7a4SDavid Howells 947c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 948c435ee34SDavid Howells inode = d_inode(dentry); 949c435ee34SDavid Howells if (inode) { 950c435ee34SDavid Howells vnode = AFS_FS_I(inode); 951c435ee34SDavid Howells afs_validate(vnode, key); 952c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 953c435ee34SDavid Howells goto out_bad; 954c435ee34SDavid Howells } 955c435ee34SDavid Howells } 956c435ee34SDavid Howells 9571da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 95808e0e7c8SDavid Howells parent = dget_parent(dentry); 9592b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9601da177e4SLinus Torvalds 961260a9803SDavid Howells /* validate the parent directory */ 962260a9803SDavid Howells afs_validate(dir, key); 963260a9803SDavid Howells 964260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 965a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 966c435ee34SDavid Howells goto out_bad_parent; 9671da177e4SLinus Torvalds } 9681da177e4SLinus Torvalds 969a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 970a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 971a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 972a4ff7401SDavid Howells * version. 973a4ff7401SDavid Howells */ 974a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 975a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 976a4ff7401SDavid Howells if (de_version == dir_version) 977a4ff7401SDavid Howells goto out_valid; 978a4ff7401SDavid Howells 979a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 980a4ff7401SDavid Howells if (de_version - dir_version >= 0) 981a4ff7401SDavid Howells goto out_valid; 982260a9803SDavid Howells 98308e0e7c8SDavid Howells _debug("dir modified"); 984d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* search the directory for this vnode */ 9875cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 988260a9803SDavid Howells switch (ret) { 989260a9803SDavid Howells case 0: 990260a9803SDavid Howells /* the filename maps to something */ 9912b0143b5SDavid Howells if (d_really_is_negative(dentry)) 992c435ee34SDavid Howells goto out_bad_parent; 993c435ee34SDavid Howells inode = d_inode(dentry); 994c435ee34SDavid Howells if (is_bad_inode(inode)) { 995a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 996a455589fSAl Viro dentry); 997c435ee34SDavid Howells goto out_bad_parent; 9981da177e4SLinus Torvalds } 9991da177e4SLinus Torvalds 1000c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1001c435ee34SDavid Howells 10021da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 10031da177e4SLinus Torvalds * different file */ 100408e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 10053b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1006a455589fSAl Viro dentry, fid.vnode, 100708e0e7c8SDavid Howells vnode->fid.vnode); 10081da177e4SLinus Torvalds goto not_found; 10091da177e4SLinus Torvalds } 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1012260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1013260a9803SDavid Howells * been reused */ 101408e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1015a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1016a455589fSAl Viro dentry, fid.unique, 10177a224228SJean Noel Cordenner vnode->fid.unique, 1018c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1019c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 102008e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1021c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1022260a9803SDavid Howells goto not_found; 1023260a9803SDavid Howells } 1024260a9803SDavid Howells goto out_valid; 1025260a9803SDavid Howells 1026260a9803SDavid Howells case -ENOENT: 1027260a9803SDavid Howells /* the filename is unknown */ 1028a455589fSAl Viro _debug("%pd: dirent not found", dentry); 10292b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1030260a9803SDavid Howells goto not_found; 1031260a9803SDavid Howells goto out_valid; 1032260a9803SDavid Howells 1033260a9803SDavid Howells default: 1034a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1035a455589fSAl Viro parent, ret); 1036c435ee34SDavid Howells goto out_bad_parent; 10371da177e4SLinus Torvalds } 103808e0e7c8SDavid Howells 10391da177e4SLinus Torvalds out_valid: 1040a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10411da177e4SLinus Torvalds dput(parent); 104200d3b7a4SDavid Howells key_put(key); 10431da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10441da177e4SLinus Torvalds return 1; 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10471da177e4SLinus Torvalds not_found: 10481da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10491da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10501da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10511da177e4SLinus Torvalds 1052c435ee34SDavid Howells out_bad_parent: 1053a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10541da177e4SLinus Torvalds dput(parent); 1055c435ee34SDavid Howells out_bad: 105600d3b7a4SDavid Howells key_put(key); 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10591da177e4SLinus Torvalds return 0; 1060ec26815aSDavid Howells } 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds /* 10631da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10641da177e4SLinus Torvalds * sleep) 10651da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10661da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10671da177e4SLinus Torvalds */ 1068fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10691da177e4SLinus Torvalds { 1070a455589fSAl Viro _enter("%pd", dentry); 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10731da177e4SLinus Torvalds goto zap; 10741da177e4SLinus Torvalds 10752b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10762b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10772b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10781da177e4SLinus Torvalds goto zap; 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10811da177e4SLinus Torvalds return 0; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds zap: 10841da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10851da177e4SLinus Torvalds return 1; 1086ec26815aSDavid Howells } 1087260a9803SDavid Howells 1088260a9803SDavid Howells /* 108979ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 109079ddbfa5SDavid Howells */ 109179ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 109279ddbfa5SDavid Howells { 109379ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 109479ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 109579ddbfa5SDavid Howells iput(inode); 109679ddbfa5SDavid Howells } 109779ddbfa5SDavid Howells 109879ddbfa5SDavid Howells /* 1099260a9803SDavid Howells * handle dentry release 1100260a9803SDavid Howells */ 110166c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1102260a9803SDavid Howells { 1103a455589fSAl Viro _enter("%pd", dentry); 1104260a9803SDavid Howells } 1105260a9803SDavid Howells 1106260a9803SDavid Howells /* 1107d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1108d2ddc776SDavid Howells */ 1109d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1110d2ddc776SDavid Howells struct dentry *new_dentry, 1111d2ddc776SDavid Howells struct afs_fid *newfid, 1112d2ddc776SDavid Howells struct afs_file_status *newstatus, 1113d2ddc776SDavid Howells struct afs_callback *newcb) 1114d2ddc776SDavid Howells { 11155a813276SDavid Howells struct afs_vnode *vnode; 1116d2ddc776SDavid Howells struct inode *inode; 1117d2ddc776SDavid Howells 1118d2ddc776SDavid Howells if (fc->ac.error < 0) 1119d2ddc776SDavid Howells return; 1120d2ddc776SDavid Howells 1121d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1122d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1123d2ddc776SDavid Howells if (IS_ERR(inode)) { 1124d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1125d2ddc776SDavid Howells * the new directory on the server. 1126d2ddc776SDavid Howells */ 1127d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1128d2ddc776SDavid Howells return; 1129d2ddc776SDavid Howells } 1130d2ddc776SDavid Howells 11315a813276SDavid Howells vnode = AFS_FS_I(inode); 11325a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 113300671912SDavid Howells afs_vnode_commit_status(fc, vnode, 0); 113473116df7SDavid Howells d_instantiate(new_dentry, inode); 1135d2ddc776SDavid Howells } 1136d2ddc776SDavid Howells 1137d2ddc776SDavid Howells /* 1138260a9803SDavid Howells * create a directory on an AFS filesystem 1139260a9803SDavid Howells */ 114018bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1141260a9803SDavid Howells { 1142d2ddc776SDavid Howells struct afs_file_status newstatus; 1143d2ddc776SDavid Howells struct afs_fs_cursor fc; 1144d2ddc776SDavid Howells struct afs_callback newcb; 1145d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1146d2ddc776SDavid Howells struct afs_fid newfid; 1147260a9803SDavid Howells struct key *key; 114863a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1149260a9803SDavid Howells int ret; 1150260a9803SDavid Howells 1151d2ddc776SDavid Howells mode |= S_IFDIR; 1152260a9803SDavid Howells 11533b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1154a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1155260a9803SDavid Howells 1156260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1157260a9803SDavid Howells if (IS_ERR(key)) { 1158260a9803SDavid Howells ret = PTR_ERR(key); 1159260a9803SDavid Howells goto error; 1160260a9803SDavid Howells } 1161260a9803SDavid Howells 1162d2ddc776SDavid Howells ret = -ERESTARTSYS; 1163d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1164d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 116568251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 116663a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1167d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1168d2ddc776SDavid Howells } 1169d2ddc776SDavid Howells 1170d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1171d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1172d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1173d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1174260a9803SDavid Howells if (ret < 0) 1175d2ddc776SDavid Howells goto error_key; 11764433b691SDavid Howells } else { 11774433b691SDavid Howells goto error_key; 1178260a9803SDavid Howells } 1179260a9803SDavid Howells 118063a4681fSDavid Howells if (ret == 0 && 118163a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 118263a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 118363a4681fSDavid Howells afs_edit_dir_for_create); 118463a4681fSDavid Howells 1185260a9803SDavid Howells key_put(key); 1186260a9803SDavid Howells _leave(" = 0"); 1187260a9803SDavid Howells return 0; 1188260a9803SDavid Howells 1189d2ddc776SDavid Howells error_key: 1190260a9803SDavid Howells key_put(key); 1191260a9803SDavid Howells error: 1192260a9803SDavid Howells d_drop(dentry); 1193260a9803SDavid Howells _leave(" = %d", ret); 1194260a9803SDavid Howells return ret; 1195260a9803SDavid Howells } 1196260a9803SDavid Howells 1197260a9803SDavid Howells /* 1198d2ddc776SDavid Howells * Remove a subdir from a directory. 1199260a9803SDavid Howells */ 1200d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1201260a9803SDavid Howells { 12022b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1203d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1204d2ddc776SDavid Howells 1205260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1206260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1207c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 120863a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1209260a9803SDavid Howells } 1210260a9803SDavid Howells } 1211260a9803SDavid Howells 1212260a9803SDavid Howells /* 1213d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1214260a9803SDavid Howells */ 1215d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1216260a9803SDavid Howells { 1217d2ddc776SDavid Howells struct afs_fs_cursor fc; 1218f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1219260a9803SDavid Howells struct key *key; 122063a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1221260a9803SDavid Howells int ret; 1222260a9803SDavid Howells 12233b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1224a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1225260a9803SDavid Howells 1226260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1227260a9803SDavid Howells if (IS_ERR(key)) { 1228260a9803SDavid Howells ret = PTR_ERR(key); 1229260a9803SDavid Howells goto error; 1230260a9803SDavid Howells } 1231260a9803SDavid Howells 1232f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1233f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1234f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1235f58db83fSDavid Howells ret = afs_validate(vnode, key); 1236f58db83fSDavid Howells if (ret < 0) 1237f58db83fSDavid Howells goto error_key; 1238f58db83fSDavid Howells } 1239f58db83fSDavid Howells 124079ddbfa5SDavid Howells if (vnode) { 124179ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 124279ddbfa5SDavid Howells if (ret < 0) 124379ddbfa5SDavid Howells goto error_key; 124479ddbfa5SDavid Howells } 124579ddbfa5SDavid Howells 1246d2ddc776SDavid Howells ret = -ERESTARTSYS; 1247d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1248d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 124968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 125030062bd1SDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, true, 125163a4681fSDavid Howells data_version); 1252260a9803SDavid Howells } 1253260a9803SDavid Howells 1254d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1255d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 125663a4681fSDavid Howells if (ret == 0) { 1257d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 125863a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 125963a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 126063a4681fSDavid Howells afs_edit_dir_for_rmdir); 126163a4681fSDavid Howells } 1262260a9803SDavid Howells } 1263260a9803SDavid Howells 126479ddbfa5SDavid Howells if (vnode) 126579ddbfa5SDavid Howells up_write(&vnode->rmdir_lock); 1266f58db83fSDavid Howells error_key: 1267260a9803SDavid Howells key_put(key); 1268d2ddc776SDavid Howells error: 1269d2ddc776SDavid Howells return ret; 1270d2ddc776SDavid Howells } 1271260a9803SDavid Howells 1272d2ddc776SDavid Howells /* 1273d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1274d2ddc776SDavid Howells * 1275d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1276d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1277d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1278d2ddc776SDavid Howells * 1279d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1280d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1281d2ddc776SDavid Howells */ 128279ddbfa5SDavid Howells int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1283440fbc3aSDavid Howells unsigned long d_version_before, 1284440fbc3aSDavid Howells unsigned long d_version_after) 1285d2ddc776SDavid Howells { 1286440fbc3aSDavid Howells bool dir_valid; 1287d2ddc776SDavid Howells int ret = 0; 1288d2ddc776SDavid Howells 1289440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1290440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1291440fbc3aSDavid Howells */ 1292440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1293440fbc3aSDavid Howells 1294d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1295d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1296d2ddc776SDavid Howells 129730062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 129830062bd1SDavid Howells /* Already done */ 129930062bd1SDavid Howells } else if (dir_valid) { 1300440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1301440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1302440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1303440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1304440fbc3aSDavid Howells } 1305440fbc3aSDavid Howells ret = 0; 1306440fbc3aSDavid Howells } else { 1307440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1308440fbc3aSDavid Howells 1309d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1310d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1311d2ddc776SDavid Howells 1312d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1313d2ddc776SDavid Howells if (ret == -ESTALE) 1314d2ddc776SDavid Howells ret = 0; 1315440fbc3aSDavid Howells } 1316d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1317d2ddc776SDavid Howells } 1318d2ddc776SDavid Howells 1319d2ddc776SDavid Howells return ret; 1320d2ddc776SDavid Howells } 1321d2ddc776SDavid Howells 1322d2ddc776SDavid Howells /* 1323d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1324d2ddc776SDavid Howells */ 1325d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1326d2ddc776SDavid Howells { 1327d2ddc776SDavid Howells struct afs_fs_cursor fc; 132830062bd1SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1329d2ddc776SDavid Howells struct key *key; 1330440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 133179ddbfa5SDavid Howells bool need_rehash = false; 133263a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1333d2ddc776SDavid Howells int ret; 1334d2ddc776SDavid Howells 13353b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1336d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1337d2ddc776SDavid Howells 1338d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1339d2ddc776SDavid Howells return -ENAMETOOLONG; 1340d2ddc776SDavid Howells 1341d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1342d2ddc776SDavid Howells if (IS_ERR(key)) { 1343d2ddc776SDavid Howells ret = PTR_ERR(key); 1344d2ddc776SDavid Howells goto error; 1345d2ddc776SDavid Howells } 1346d2ddc776SDavid Howells 1347d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1348d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1349d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1350d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1351d2ddc776SDavid Howells if (ret < 0) 1352d2ddc776SDavid Howells goto error_key; 1353d2ddc776SDavid Howells } 1354d2ddc776SDavid Howells 135579ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 135679ddbfa5SDavid Howells if (vnode && d_count(dentry) > 1) { 135779ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 135879ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 135979ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 136079ddbfa5SDavid Howells ret = afs_sillyrename(dvnode, vnode, dentry, key); 136179ddbfa5SDavid Howells goto error_key; 136279ddbfa5SDavid Howells } 136379ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 136479ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 136579ddbfa5SDavid Howells __d_drop(dentry); 136679ddbfa5SDavid Howells need_rehash = true; 136779ddbfa5SDavid Howells } 136879ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 136979ddbfa5SDavid Howells 1370d2ddc776SDavid Howells ret = -ERESTARTSYS; 1371d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1372d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 137368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 137430062bd1SDavid Howells 137530062bd1SDavid Howells if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && 137630062bd1SDavid Howells !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { 137730062bd1SDavid Howells yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, 137830062bd1SDavid Howells data_version); 137930062bd1SDavid Howells if (fc.ac.error != -ECONNABORTED || 138030062bd1SDavid Howells fc.ac.abort_code != RXGEN_OPCODE) 138130062bd1SDavid Howells continue; 138230062bd1SDavid Howells set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); 138330062bd1SDavid Howells } 138430062bd1SDavid Howells 138530062bd1SDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, false, 138663a4681fSDavid Howells data_version); 1387d2ddc776SDavid Howells } 1388d2ddc776SDavid Howells 1389d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1390d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1391d2ddc776SDavid Howells if (ret == 0) 1392440fbc3aSDavid Howells ret = afs_dir_remove_link( 1393440fbc3aSDavid Howells dentry, key, d_version, 1394440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 139563a4681fSDavid Howells if (ret == 0 && 139663a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 139763a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 139863a4681fSDavid Howells afs_edit_dir_for_unlink); 1399d2ddc776SDavid Howells } 1400d2ddc776SDavid Howells 140179ddbfa5SDavid Howells if (need_rehash && ret < 0 && ret != -ENOENT) 140279ddbfa5SDavid Howells d_rehash(dentry); 140379ddbfa5SDavid Howells 1404d2ddc776SDavid Howells error_key: 1405260a9803SDavid Howells key_put(key); 1406260a9803SDavid Howells error: 1407260a9803SDavid Howells _leave(" = %d", ret); 1408260a9803SDavid Howells return ret; 1409260a9803SDavid Howells } 1410260a9803SDavid Howells 1411260a9803SDavid Howells /* 1412260a9803SDavid Howells * create a regular file on an AFS filesystem 1413260a9803SDavid Howells */ 14144acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1415ebfc3b49SAl Viro bool excl) 1416260a9803SDavid Howells { 1417d2ddc776SDavid Howells struct afs_fs_cursor fc; 1418d2ddc776SDavid Howells struct afs_file_status newstatus; 1419d2ddc776SDavid Howells struct afs_callback newcb; 142043dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1421d2ddc776SDavid Howells struct afs_fid newfid; 1422260a9803SDavid Howells struct key *key; 142363a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1424260a9803SDavid Howells int ret; 1425260a9803SDavid Howells 1426d2ddc776SDavid Howells mode |= S_IFREG; 1427260a9803SDavid Howells 14283b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho,", 1429a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1430260a9803SDavid Howells 1431d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1432d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1433d2ddc776SDavid Howells goto error; 1434d2ddc776SDavid Howells 1435260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1436260a9803SDavid Howells if (IS_ERR(key)) { 1437260a9803SDavid Howells ret = PTR_ERR(key); 1438260a9803SDavid Howells goto error; 1439260a9803SDavid Howells } 1440260a9803SDavid Howells 1441d2ddc776SDavid Howells ret = -ERESTARTSYS; 1442d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1443d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 144468251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 144563a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1446d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1447d2ddc776SDavid Howells } 1448d2ddc776SDavid Howells 1449d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1450d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1451d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1452d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1453260a9803SDavid Howells if (ret < 0) 1454d2ddc776SDavid Howells goto error_key; 14554433b691SDavid Howells } else { 14564433b691SDavid Howells goto error_key; 1457260a9803SDavid Howells } 1458260a9803SDavid Howells 145963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 146063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 146163a4681fSDavid Howells afs_edit_dir_for_create); 146263a4681fSDavid Howells 1463260a9803SDavid Howells key_put(key); 1464260a9803SDavid Howells _leave(" = 0"); 1465260a9803SDavid Howells return 0; 1466260a9803SDavid Howells 1467d2ddc776SDavid Howells error_key: 1468260a9803SDavid Howells key_put(key); 1469260a9803SDavid Howells error: 1470260a9803SDavid Howells d_drop(dentry); 1471260a9803SDavid Howells _leave(" = %d", ret); 1472260a9803SDavid Howells return ret; 1473260a9803SDavid Howells } 1474260a9803SDavid Howells 1475260a9803SDavid Howells /* 1476260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1477260a9803SDavid Howells */ 1478260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1479260a9803SDavid Howells struct dentry *dentry) 1480260a9803SDavid Howells { 1481d2ddc776SDavid Howells struct afs_fs_cursor fc; 1482260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1483260a9803SDavid Howells struct key *key; 148463a4681fSDavid Howells u64 data_version; 1485260a9803SDavid Howells int ret; 1486260a9803SDavid Howells 14872b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1488260a9803SDavid Howells dvnode = AFS_FS_I(dir); 148963a4681fSDavid Howells data_version = dvnode->status.data_version; 1490260a9803SDavid Howells 14913b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1492260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1493260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1494a455589fSAl Viro dentry); 1495260a9803SDavid Howells 1496d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1497d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1498d2ddc776SDavid Howells goto error; 1499d2ddc776SDavid Howells 1500260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1501260a9803SDavid Howells if (IS_ERR(key)) { 1502260a9803SDavid Howells ret = PTR_ERR(key); 1503260a9803SDavid Howells goto error; 1504260a9803SDavid Howells } 1505260a9803SDavid Howells 1506d2ddc776SDavid Howells ret = -ERESTARTSYS; 1507d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1508d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1509d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1510bc1527dcSDavid Howells goto error_key; 1511d2ddc776SDavid Howells } 1512260a9803SDavid Howells 1513d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 151468251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 151568251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 151663a4681fSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); 1517d2ddc776SDavid Howells } 1518d2ddc776SDavid Howells 1519d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1520d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 15217de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1522260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1523d2ddc776SDavid Howells 1524d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1525d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1526d2ddc776SDavid Howells if (ret < 0) 1527d2ddc776SDavid Howells goto error_key; 15284433b691SDavid Howells } else { 15294433b691SDavid Howells goto error_key; 1530d2ddc776SDavid Howells } 1531d2ddc776SDavid Howells 153263a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 153363a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 153463a4681fSDavid Howells afs_edit_dir_for_link); 153563a4681fSDavid Howells 1536260a9803SDavid Howells key_put(key); 1537260a9803SDavid Howells _leave(" = 0"); 1538260a9803SDavid Howells return 0; 1539260a9803SDavid Howells 1540d2ddc776SDavid Howells error_key: 1541260a9803SDavid Howells key_put(key); 1542260a9803SDavid Howells error: 1543260a9803SDavid Howells d_drop(dentry); 1544260a9803SDavid Howells _leave(" = %d", ret); 1545260a9803SDavid Howells return ret; 1546260a9803SDavid Howells } 1547260a9803SDavid Howells 1548260a9803SDavid Howells /* 1549260a9803SDavid Howells * create a symlink in an AFS filesystem 1550260a9803SDavid Howells */ 1551260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1552260a9803SDavid Howells const char *content) 1553260a9803SDavid Howells { 1554d2ddc776SDavid Howells struct afs_fs_cursor fc; 1555d2ddc776SDavid Howells struct afs_file_status newstatus; 1556d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1557d2ddc776SDavid Howells struct afs_fid newfid; 1558260a9803SDavid Howells struct key *key; 155963a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1560260a9803SDavid Howells int ret; 1561260a9803SDavid Howells 15623b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1563a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1564260a9803SDavid Howells content); 1565260a9803SDavid Howells 1566d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1567d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1568d2ddc776SDavid Howells goto error; 1569d2ddc776SDavid Howells 1570260a9803SDavid Howells ret = -EINVAL; 157145222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1572260a9803SDavid Howells goto error; 1573260a9803SDavid Howells 1574260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1575260a9803SDavid Howells if (IS_ERR(key)) { 1576260a9803SDavid Howells ret = PTR_ERR(key); 1577260a9803SDavid Howells goto error; 1578260a9803SDavid Howells } 1579260a9803SDavid Howells 1580d2ddc776SDavid Howells ret = -ERESTARTSYS; 1581d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1582d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 158368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 158463a4681fSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, 158563a4681fSDavid Howells content, data_version, 1586d2ddc776SDavid Howells &newfid, &newstatus); 1587d2ddc776SDavid Howells } 1588d2ddc776SDavid Howells 1589d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1590d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1591d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1592d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1593260a9803SDavid Howells if (ret < 0) 1594d2ddc776SDavid Howells goto error_key; 15954433b691SDavid Howells } else { 15964433b691SDavid Howells goto error_key; 1597260a9803SDavid Howells } 1598260a9803SDavid Howells 159963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 160063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 160163a4681fSDavid Howells afs_edit_dir_for_symlink); 160263a4681fSDavid Howells 1603260a9803SDavid Howells key_put(key); 1604260a9803SDavid Howells _leave(" = 0"); 1605260a9803SDavid Howells return 0; 1606260a9803SDavid Howells 1607d2ddc776SDavid Howells error_key: 1608260a9803SDavid Howells key_put(key); 1609260a9803SDavid Howells error: 1610260a9803SDavid Howells d_drop(dentry); 1611260a9803SDavid Howells _leave(" = %d", ret); 1612260a9803SDavid Howells return ret; 1613260a9803SDavid Howells } 1614260a9803SDavid Howells 1615260a9803SDavid Howells /* 1616260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1617260a9803SDavid Howells */ 1618260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 16191cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 16201cd66c93SMiklos Szeredi unsigned int flags) 1621260a9803SDavid Howells { 1622d2ddc776SDavid Howells struct afs_fs_cursor fc; 1623260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 162479ddbfa5SDavid Howells struct dentry *tmp = NULL, *rehash = NULL; 162579ddbfa5SDavid Howells struct inode *new_inode; 1626260a9803SDavid Howells struct key *key; 162763a4681fSDavid Howells u64 orig_data_version, new_data_version; 162863a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1629260a9803SDavid Howells int ret; 1630260a9803SDavid Howells 16311cd66c93SMiklos Szeredi if (flags) 16321cd66c93SMiklos Szeredi return -EINVAL; 16331cd66c93SMiklos Szeredi 163479ddbfa5SDavid Howells /* Don't allow silly-rename files be moved around. */ 163579ddbfa5SDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 163679ddbfa5SDavid Howells return -EINVAL; 163779ddbfa5SDavid Howells 16382b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1639260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1640260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 164163a4681fSDavid Howells orig_data_version = orig_dvnode->status.data_version; 164263a4681fSDavid Howells new_data_version = new_dvnode->status.data_version; 1643260a9803SDavid Howells 16443b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1645260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1646260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1647260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1648a455589fSAl Viro new_dentry); 1649260a9803SDavid Howells 1650260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1651260a9803SDavid Howells if (IS_ERR(key)) { 1652260a9803SDavid Howells ret = PTR_ERR(key); 1653260a9803SDavid Howells goto error; 1654260a9803SDavid Howells } 1655260a9803SDavid Howells 165679ddbfa5SDavid Howells /* For non-directories, check whether the target is busy and if so, 165779ddbfa5SDavid Howells * make a copy of the dentry and then do a silly-rename. If the 165879ddbfa5SDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 165979ddbfa5SDavid Howells * new target. 166079ddbfa5SDavid Howells */ 166179ddbfa5SDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 166279ddbfa5SDavid Howells /* To prevent any new references to the target during the 166379ddbfa5SDavid Howells * rename, we unhash the dentry in advance. 166479ddbfa5SDavid Howells */ 166579ddbfa5SDavid Howells if (!d_unhashed(new_dentry)) { 166679ddbfa5SDavid Howells d_drop(new_dentry); 166779ddbfa5SDavid Howells rehash = new_dentry; 166879ddbfa5SDavid Howells } 166979ddbfa5SDavid Howells 167079ddbfa5SDavid Howells if (d_count(new_dentry) > 2) { 167179ddbfa5SDavid Howells /* copy the target dentry's name */ 167279ddbfa5SDavid Howells ret = -ENOMEM; 167379ddbfa5SDavid Howells tmp = d_alloc(new_dentry->d_parent, 167479ddbfa5SDavid Howells &new_dentry->d_name); 167579ddbfa5SDavid Howells if (!tmp) 167679ddbfa5SDavid Howells goto error_rehash; 167779ddbfa5SDavid Howells 167879ddbfa5SDavid Howells ret = afs_sillyrename(new_dvnode, 167979ddbfa5SDavid Howells AFS_FS_I(d_inode(new_dentry)), 168079ddbfa5SDavid Howells new_dentry, key); 168179ddbfa5SDavid Howells if (ret) 168279ddbfa5SDavid Howells goto error_rehash; 168379ddbfa5SDavid Howells 168479ddbfa5SDavid Howells new_dentry = tmp; 168579ddbfa5SDavid Howells rehash = NULL; 168679ddbfa5SDavid Howells new_negative = true; 168779ddbfa5SDavid Howells orig_data_version = orig_dvnode->status.data_version; 168879ddbfa5SDavid Howells new_data_version = new_dvnode->status.data_version; 168979ddbfa5SDavid Howells } 169079ddbfa5SDavid Howells } 169179ddbfa5SDavid Howells 1692d2ddc776SDavid Howells ret = -ERESTARTSYS; 1693d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1694d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1695d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1696d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 169779ddbfa5SDavid Howells goto error_rehash; 1698d2ddc776SDavid Howells } 1699d2ddc776SDavid Howells } 1700d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 170168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 170268251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1703d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 170463a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 170563a4681fSDavid Howells orig_data_version, new_data_version); 1706d2ddc776SDavid Howells } 1707d2ddc776SDavid Howells 1708d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1709d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1710d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1711d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1712d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1713260a9803SDavid Howells if (ret < 0) 171479ddbfa5SDavid Howells goto error_rehash; 1715d2ddc776SDavid Howells } 1716d2ddc776SDavid Howells 171763a4681fSDavid Howells if (ret == 0) { 171879ddbfa5SDavid Howells if (rehash) 171979ddbfa5SDavid Howells d_rehash(rehash); 172063a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 172163a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 172279ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 172363a4681fSDavid Howells 172463a4681fSDavid Howells if (!new_negative && 172563a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 172663a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 172779ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 172863a4681fSDavid Howells 172963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 173063a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 173179ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 173279ddbfa5SDavid Howells 173379ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 173479ddbfa5SDavid Howells if (new_inode) { 173579ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 173679ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 173779ddbfa5SDavid Howells drop_nlink(new_inode); 173879ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 173979ddbfa5SDavid Howells } 174079ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 174179ddbfa5SDavid Howells goto error_tmp; 174263a4681fSDavid Howells } 174363a4681fSDavid Howells 174479ddbfa5SDavid Howells error_rehash: 174579ddbfa5SDavid Howells if (rehash) 174679ddbfa5SDavid Howells d_rehash(rehash); 174779ddbfa5SDavid Howells error_tmp: 174879ddbfa5SDavid Howells if (tmp) 174979ddbfa5SDavid Howells dput(tmp); 1750260a9803SDavid Howells key_put(key); 1751260a9803SDavid Howells error: 1752260a9803SDavid Howells _leave(" = %d", ret); 1753260a9803SDavid Howells return ret; 1754260a9803SDavid Howells } 1755f3ddee8dSDavid Howells 1756f3ddee8dSDavid Howells /* 1757f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1758f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1759f3ddee8dSDavid Howells */ 1760f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1761f3ddee8dSDavid Howells { 1762f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1763f3ddee8dSDavid Howells 17643b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1765f3ddee8dSDavid Howells 1766f3ddee8dSDavid Howells set_page_private(page, 0); 1767f3ddee8dSDavid Howells ClearPagePrivate(page); 1768f3ddee8dSDavid Howells 1769f3ddee8dSDavid Howells /* The directory will need reloading. */ 1770f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1771f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1772f3ddee8dSDavid Howells return 1; 1773f3ddee8dSDavid Howells } 1774f3ddee8dSDavid Howells 1775f3ddee8dSDavid Howells /* 1776f3ddee8dSDavid Howells * invalidate part or all of a page 1777f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1778f3ddee8dSDavid Howells * the entire page) 1779f3ddee8dSDavid Howells */ 1780f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1781f3ddee8dSDavid Howells unsigned int length) 1782f3ddee8dSDavid Howells { 1783f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1784f3ddee8dSDavid Howells 1785f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1786f3ddee8dSDavid Howells 1787f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1788f3ddee8dSDavid Howells 1789f3ddee8dSDavid Howells /* The directory will need reloading. */ 1790f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1791f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1792f3ddee8dSDavid Howells 1793f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1794f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1795f3ddee8dSDavid Howells set_page_private(page, 0); 1796f3ddee8dSDavid Howells ClearPagePrivate(page); 1797f3ddee8dSDavid Howells } 1798f3ddee8dSDavid Howells } 1799