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); 91180548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 91234b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 91380548b03SDavid Howells trace_afs_lookup(dvnode, &d->d_name, 91480548b03SDavid Howells inode ? AFS_FS_I(inode) : NULL); 91580548b03SDavid Howells } else { 91680548b03SDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, 91780548b03SDavid Howells inode ? AFS_FS_I(inode) : NULL); 91880548b03SDavid Howells } 91934b2a88fSAl Viro return d; 920ec26815aSDavid Howells } 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds /* 9231da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 9241da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 9251da177e4SLinus Torvalds * inode 9261da177e4SLinus Torvalds */ 9270b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 9281da177e4SLinus Torvalds { 929260a9803SDavid Howells struct afs_vnode *vnode, *dir; 930dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 9311da177e4SLinus Torvalds struct dentry *parent; 932c435ee34SDavid Howells struct inode *inode; 93300d3b7a4SDavid Howells struct key *key; 934a4ff7401SDavid Howells long dir_version, de_version; 9351da177e4SLinus Torvalds int ret; 9361da177e4SLinus Torvalds 9370b728e19SAl Viro if (flags & LOOKUP_RCU) 93834286d66SNick Piggin return -ECHILD; 93934286d66SNick Piggin 940c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9412b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 9423b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 943a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 944260a9803SDavid Howells vnode->flags); 945c435ee34SDavid Howells } else { 946a455589fSAl Viro _enter("{neg n=%pd}", dentry); 947c435ee34SDavid Howells } 9481da177e4SLinus Torvalds 949260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 95000d3b7a4SDavid Howells if (IS_ERR(key)) 95100d3b7a4SDavid Howells key = NULL; 95200d3b7a4SDavid Howells 953c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 954c435ee34SDavid Howells inode = d_inode(dentry); 955c435ee34SDavid Howells if (inode) { 956c435ee34SDavid Howells vnode = AFS_FS_I(inode); 957c435ee34SDavid Howells afs_validate(vnode, key); 958c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 959c435ee34SDavid Howells goto out_bad; 960c435ee34SDavid Howells } 961c435ee34SDavid Howells } 962c435ee34SDavid Howells 9631da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 96408e0e7c8SDavid Howells parent = dget_parent(dentry); 9652b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9661da177e4SLinus Torvalds 967260a9803SDavid Howells /* validate the parent directory */ 968260a9803SDavid Howells afs_validate(dir, key); 969260a9803SDavid Howells 970260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 971a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 972c435ee34SDavid Howells goto out_bad_parent; 9731da177e4SLinus Torvalds } 9741da177e4SLinus Torvalds 975a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 976a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 977a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 978a4ff7401SDavid Howells * version. 979a4ff7401SDavid Howells */ 980a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 981a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 982a4ff7401SDavid Howells if (de_version == dir_version) 983a4ff7401SDavid Howells goto out_valid; 984a4ff7401SDavid Howells 985a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 986a4ff7401SDavid Howells if (de_version - dir_version >= 0) 987a4ff7401SDavid Howells goto out_valid; 988260a9803SDavid Howells 98908e0e7c8SDavid Howells _debug("dir modified"); 990d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds /* search the directory for this vnode */ 9935cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 994260a9803SDavid Howells switch (ret) { 995260a9803SDavid Howells case 0: 996260a9803SDavid Howells /* the filename maps to something */ 9972b0143b5SDavid Howells if (d_really_is_negative(dentry)) 998c435ee34SDavid Howells goto out_bad_parent; 999c435ee34SDavid Howells inode = d_inode(dentry); 1000c435ee34SDavid Howells if (is_bad_inode(inode)) { 1001a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1002a455589fSAl Viro dentry); 1003c435ee34SDavid Howells goto out_bad_parent; 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 1006c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1007c435ee34SDavid Howells 10081da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 10091da177e4SLinus Torvalds * different file */ 101008e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 10113b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1012a455589fSAl Viro dentry, fid.vnode, 101308e0e7c8SDavid Howells vnode->fid.vnode); 10141da177e4SLinus Torvalds goto not_found; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1018260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1019260a9803SDavid Howells * been reused */ 102008e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1021a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1022a455589fSAl Viro dentry, fid.unique, 10237a224228SJean Noel Cordenner vnode->fid.unique, 1024c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1025c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 102608e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1027c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1028260a9803SDavid Howells goto not_found; 1029260a9803SDavid Howells } 1030260a9803SDavid Howells goto out_valid; 1031260a9803SDavid Howells 1032260a9803SDavid Howells case -ENOENT: 1033260a9803SDavid Howells /* the filename is unknown */ 1034a455589fSAl Viro _debug("%pd: dirent not found", dentry); 10352b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1036260a9803SDavid Howells goto not_found; 1037260a9803SDavid Howells goto out_valid; 1038260a9803SDavid Howells 1039260a9803SDavid Howells default: 1040a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1041a455589fSAl Viro parent, ret); 1042c435ee34SDavid Howells goto out_bad_parent; 10431da177e4SLinus Torvalds } 104408e0e7c8SDavid Howells 10451da177e4SLinus Torvalds out_valid: 1046a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10471da177e4SLinus Torvalds dput(parent); 104800d3b7a4SDavid Howells key_put(key); 10491da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10501da177e4SLinus Torvalds return 1; 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10531da177e4SLinus Torvalds not_found: 10541da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10551da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10561da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10571da177e4SLinus Torvalds 1058c435ee34SDavid Howells out_bad_parent: 1059a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10601da177e4SLinus Torvalds dput(parent); 1061c435ee34SDavid Howells out_bad: 106200d3b7a4SDavid Howells key_put(key); 10631da177e4SLinus Torvalds 10641da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10651da177e4SLinus Torvalds return 0; 1066ec26815aSDavid Howells } 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds /* 10691da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10701da177e4SLinus Torvalds * sleep) 10711da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10721da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10731da177e4SLinus Torvalds */ 1074fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10751da177e4SLinus Torvalds { 1076a455589fSAl Viro _enter("%pd", dentry); 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10791da177e4SLinus Torvalds goto zap; 10801da177e4SLinus Torvalds 10812b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10822b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10832b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10841da177e4SLinus Torvalds goto zap; 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10871da177e4SLinus Torvalds return 0; 10881da177e4SLinus Torvalds 10891da177e4SLinus Torvalds zap: 10901da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10911da177e4SLinus Torvalds return 1; 1092ec26815aSDavid Howells } 1093260a9803SDavid Howells 1094260a9803SDavid Howells /* 109579ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 109679ddbfa5SDavid Howells */ 109779ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 109879ddbfa5SDavid Howells { 109979ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 110079ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 110179ddbfa5SDavid Howells iput(inode); 110279ddbfa5SDavid Howells } 110379ddbfa5SDavid Howells 110479ddbfa5SDavid Howells /* 1105260a9803SDavid Howells * handle dentry release 1106260a9803SDavid Howells */ 110766c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1108260a9803SDavid Howells { 1109a455589fSAl Viro _enter("%pd", dentry); 1110260a9803SDavid Howells } 1111260a9803SDavid Howells 1112260a9803SDavid Howells /* 1113d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1114d2ddc776SDavid Howells */ 1115d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1116d2ddc776SDavid Howells struct dentry *new_dentry, 1117d2ddc776SDavid Howells struct afs_fid *newfid, 1118d2ddc776SDavid Howells struct afs_file_status *newstatus, 1119d2ddc776SDavid Howells struct afs_callback *newcb) 1120d2ddc776SDavid Howells { 11215a813276SDavid Howells struct afs_vnode *vnode; 1122d2ddc776SDavid Howells struct inode *inode; 1123d2ddc776SDavid Howells 1124d2ddc776SDavid Howells if (fc->ac.error < 0) 1125d2ddc776SDavid Howells return; 1126d2ddc776SDavid Howells 1127d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1128d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1129d2ddc776SDavid Howells if (IS_ERR(inode)) { 1130d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1131d2ddc776SDavid Howells * the new directory on the server. 1132d2ddc776SDavid Howells */ 1133d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1134d2ddc776SDavid Howells return; 1135d2ddc776SDavid Howells } 1136d2ddc776SDavid Howells 11375a813276SDavid Howells vnode = AFS_FS_I(inode); 11385a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 113900671912SDavid Howells afs_vnode_commit_status(fc, vnode, 0); 114073116df7SDavid Howells d_instantiate(new_dentry, inode); 1141d2ddc776SDavid Howells } 1142d2ddc776SDavid Howells 1143d2ddc776SDavid Howells /* 1144260a9803SDavid Howells * create a directory on an AFS filesystem 1145260a9803SDavid Howells */ 114618bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1147260a9803SDavid Howells { 1148d2ddc776SDavid Howells struct afs_file_status newstatus; 1149d2ddc776SDavid Howells struct afs_fs_cursor fc; 1150d2ddc776SDavid Howells struct afs_callback newcb; 1151d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1152d2ddc776SDavid Howells struct afs_fid newfid; 1153260a9803SDavid Howells struct key *key; 115463a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1155260a9803SDavid Howells int ret; 1156260a9803SDavid Howells 1157d2ddc776SDavid Howells mode |= S_IFDIR; 1158260a9803SDavid Howells 11593b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1160a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1161260a9803SDavid Howells 1162260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1163260a9803SDavid Howells if (IS_ERR(key)) { 1164260a9803SDavid Howells ret = PTR_ERR(key); 1165260a9803SDavid Howells goto error; 1166260a9803SDavid Howells } 1167260a9803SDavid Howells 1168d2ddc776SDavid Howells ret = -ERESTARTSYS; 1169d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1170d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 117168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 117263a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1173d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1174d2ddc776SDavid Howells } 1175d2ddc776SDavid Howells 1176d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1177d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1178d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1179d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1180260a9803SDavid Howells if (ret < 0) 1181d2ddc776SDavid Howells goto error_key; 11824433b691SDavid Howells } else { 11834433b691SDavid Howells goto error_key; 1184260a9803SDavid Howells } 1185260a9803SDavid Howells 118663a4681fSDavid Howells if (ret == 0 && 118763a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 118863a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 118963a4681fSDavid Howells afs_edit_dir_for_create); 119063a4681fSDavid Howells 1191260a9803SDavid Howells key_put(key); 1192260a9803SDavid Howells _leave(" = 0"); 1193260a9803SDavid Howells return 0; 1194260a9803SDavid Howells 1195d2ddc776SDavid Howells error_key: 1196260a9803SDavid Howells key_put(key); 1197260a9803SDavid Howells error: 1198260a9803SDavid Howells d_drop(dentry); 1199260a9803SDavid Howells _leave(" = %d", ret); 1200260a9803SDavid Howells return ret; 1201260a9803SDavid Howells } 1202260a9803SDavid Howells 1203260a9803SDavid Howells /* 1204d2ddc776SDavid Howells * Remove a subdir from a directory. 1205260a9803SDavid Howells */ 1206d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1207260a9803SDavid Howells { 12082b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1209d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1210d2ddc776SDavid Howells 1211260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1212260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1213c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 121463a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1215260a9803SDavid Howells } 1216260a9803SDavid Howells } 1217260a9803SDavid Howells 1218260a9803SDavid Howells /* 1219d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1220260a9803SDavid Howells */ 1221d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1222260a9803SDavid Howells { 1223d2ddc776SDavid Howells struct afs_fs_cursor fc; 1224f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1225260a9803SDavid Howells struct key *key; 122663a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1227260a9803SDavid Howells int ret; 1228260a9803SDavid Howells 12293b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1230a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1231260a9803SDavid Howells 1232260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1233260a9803SDavid Howells if (IS_ERR(key)) { 1234260a9803SDavid Howells ret = PTR_ERR(key); 1235260a9803SDavid Howells goto error; 1236260a9803SDavid Howells } 1237260a9803SDavid Howells 1238f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1239f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1240f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1241f58db83fSDavid Howells ret = afs_validate(vnode, key); 1242f58db83fSDavid Howells if (ret < 0) 1243f58db83fSDavid Howells goto error_key; 1244f58db83fSDavid Howells } 1245f58db83fSDavid Howells 124679ddbfa5SDavid Howells if (vnode) { 124779ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 124879ddbfa5SDavid Howells if (ret < 0) 124979ddbfa5SDavid Howells goto error_key; 125079ddbfa5SDavid Howells } 125179ddbfa5SDavid Howells 1252d2ddc776SDavid Howells ret = -ERESTARTSYS; 1253d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1254d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 125568251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 125630062bd1SDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, true, 125763a4681fSDavid Howells data_version); 1258260a9803SDavid Howells } 1259260a9803SDavid Howells 1260d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1261d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 126263a4681fSDavid Howells if (ret == 0) { 1263d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 126463a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 126563a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 126663a4681fSDavid Howells afs_edit_dir_for_rmdir); 126763a4681fSDavid Howells } 1268260a9803SDavid Howells } 1269260a9803SDavid Howells 127079ddbfa5SDavid Howells if (vnode) 127179ddbfa5SDavid Howells up_write(&vnode->rmdir_lock); 1272f58db83fSDavid Howells error_key: 1273260a9803SDavid Howells key_put(key); 1274d2ddc776SDavid Howells error: 1275d2ddc776SDavid Howells return ret; 1276d2ddc776SDavid Howells } 1277260a9803SDavid Howells 1278d2ddc776SDavid Howells /* 1279d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1280d2ddc776SDavid Howells * 1281d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1282d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1283d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1284d2ddc776SDavid Howells * 1285d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1286d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1287d2ddc776SDavid Howells */ 128879ddbfa5SDavid Howells int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1289440fbc3aSDavid Howells unsigned long d_version_before, 1290440fbc3aSDavid Howells unsigned long d_version_after) 1291d2ddc776SDavid Howells { 1292440fbc3aSDavid Howells bool dir_valid; 1293d2ddc776SDavid Howells int ret = 0; 1294d2ddc776SDavid Howells 1295440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1296440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1297440fbc3aSDavid Howells */ 1298440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1299440fbc3aSDavid Howells 1300d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1301d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1302d2ddc776SDavid Howells 130330062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 130430062bd1SDavid Howells /* Already done */ 130530062bd1SDavid Howells } else if (dir_valid) { 1306440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1307440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1308440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1309440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1310440fbc3aSDavid Howells } 1311440fbc3aSDavid Howells ret = 0; 1312440fbc3aSDavid Howells } else { 1313440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1314440fbc3aSDavid Howells 1315d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1316d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1317d2ddc776SDavid Howells 1318d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1319d2ddc776SDavid Howells if (ret == -ESTALE) 1320d2ddc776SDavid Howells ret = 0; 1321440fbc3aSDavid Howells } 1322d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1323d2ddc776SDavid Howells } 1324d2ddc776SDavid Howells 1325d2ddc776SDavid Howells return ret; 1326d2ddc776SDavid Howells } 1327d2ddc776SDavid Howells 1328d2ddc776SDavid Howells /* 1329d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1330d2ddc776SDavid Howells */ 1331d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1332d2ddc776SDavid Howells { 1333d2ddc776SDavid Howells struct afs_fs_cursor fc; 133430062bd1SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1335d2ddc776SDavid Howells struct key *key; 1336440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 133779ddbfa5SDavid Howells bool need_rehash = false; 133863a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1339d2ddc776SDavid Howells int ret; 1340d2ddc776SDavid Howells 13413b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1342d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1343d2ddc776SDavid Howells 1344d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1345d2ddc776SDavid Howells return -ENAMETOOLONG; 1346d2ddc776SDavid Howells 1347d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1348d2ddc776SDavid Howells if (IS_ERR(key)) { 1349d2ddc776SDavid Howells ret = PTR_ERR(key); 1350d2ddc776SDavid Howells goto error; 1351d2ddc776SDavid Howells } 1352d2ddc776SDavid Howells 1353d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1354d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1355d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1356d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1357d2ddc776SDavid Howells if (ret < 0) 1358d2ddc776SDavid Howells goto error_key; 1359d2ddc776SDavid Howells } 1360d2ddc776SDavid Howells 136179ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 136279ddbfa5SDavid Howells if (vnode && d_count(dentry) > 1) { 136379ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 136479ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 136579ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 136679ddbfa5SDavid Howells ret = afs_sillyrename(dvnode, vnode, dentry, key); 136779ddbfa5SDavid Howells goto error_key; 136879ddbfa5SDavid Howells } 136979ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 137079ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 137179ddbfa5SDavid Howells __d_drop(dentry); 137279ddbfa5SDavid Howells need_rehash = true; 137379ddbfa5SDavid Howells } 137479ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 137579ddbfa5SDavid Howells 1376d2ddc776SDavid Howells ret = -ERESTARTSYS; 1377d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1378d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 137968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 138030062bd1SDavid Howells 138130062bd1SDavid Howells if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && 138230062bd1SDavid Howells !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { 138330062bd1SDavid Howells yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, 138430062bd1SDavid Howells data_version); 138530062bd1SDavid Howells if (fc.ac.error != -ECONNABORTED || 138630062bd1SDavid Howells fc.ac.abort_code != RXGEN_OPCODE) 138730062bd1SDavid Howells continue; 138830062bd1SDavid Howells set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); 138930062bd1SDavid Howells } 139030062bd1SDavid Howells 139130062bd1SDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, false, 139263a4681fSDavid Howells data_version); 1393d2ddc776SDavid Howells } 1394d2ddc776SDavid Howells 1395d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1396d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1397d2ddc776SDavid Howells if (ret == 0) 1398440fbc3aSDavid Howells ret = afs_dir_remove_link( 1399440fbc3aSDavid Howells dentry, key, d_version, 1400440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 140163a4681fSDavid Howells if (ret == 0 && 140263a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 140363a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 140463a4681fSDavid Howells afs_edit_dir_for_unlink); 1405d2ddc776SDavid Howells } 1406d2ddc776SDavid Howells 140779ddbfa5SDavid Howells if (need_rehash && ret < 0 && ret != -ENOENT) 140879ddbfa5SDavid Howells d_rehash(dentry); 140979ddbfa5SDavid Howells 1410d2ddc776SDavid Howells error_key: 1411260a9803SDavid Howells key_put(key); 1412260a9803SDavid Howells error: 1413260a9803SDavid Howells _leave(" = %d", ret); 1414260a9803SDavid Howells return ret; 1415260a9803SDavid Howells } 1416260a9803SDavid Howells 1417260a9803SDavid Howells /* 1418260a9803SDavid Howells * create a regular file on an AFS filesystem 1419260a9803SDavid Howells */ 14204acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1421ebfc3b49SAl Viro bool excl) 1422260a9803SDavid Howells { 1423d2ddc776SDavid Howells struct afs_fs_cursor fc; 1424d2ddc776SDavid Howells struct afs_file_status newstatus; 1425d2ddc776SDavid Howells struct afs_callback newcb; 142643dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1427d2ddc776SDavid Howells struct afs_fid newfid; 1428260a9803SDavid Howells struct key *key; 142963a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1430260a9803SDavid Howells int ret; 1431260a9803SDavid Howells 1432d2ddc776SDavid Howells mode |= S_IFREG; 1433260a9803SDavid Howells 14343b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho,", 1435a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1436260a9803SDavid Howells 1437d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1438d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1439d2ddc776SDavid Howells goto error; 1440d2ddc776SDavid Howells 1441260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1442260a9803SDavid Howells if (IS_ERR(key)) { 1443260a9803SDavid Howells ret = PTR_ERR(key); 1444260a9803SDavid Howells goto error; 1445260a9803SDavid Howells } 1446260a9803SDavid Howells 1447d2ddc776SDavid Howells ret = -ERESTARTSYS; 1448d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1449d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 145068251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 145163a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1452d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1453d2ddc776SDavid Howells } 1454d2ddc776SDavid Howells 1455d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1456d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1457d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1458d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1459260a9803SDavid Howells if (ret < 0) 1460d2ddc776SDavid Howells goto error_key; 14614433b691SDavid Howells } else { 14624433b691SDavid Howells goto error_key; 1463260a9803SDavid Howells } 1464260a9803SDavid Howells 146563a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 146663a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 146763a4681fSDavid Howells afs_edit_dir_for_create); 146863a4681fSDavid Howells 1469260a9803SDavid Howells key_put(key); 1470260a9803SDavid Howells _leave(" = 0"); 1471260a9803SDavid Howells return 0; 1472260a9803SDavid Howells 1473d2ddc776SDavid Howells error_key: 1474260a9803SDavid Howells key_put(key); 1475260a9803SDavid Howells error: 1476260a9803SDavid Howells d_drop(dentry); 1477260a9803SDavid Howells _leave(" = %d", ret); 1478260a9803SDavid Howells return ret; 1479260a9803SDavid Howells } 1480260a9803SDavid Howells 1481260a9803SDavid Howells /* 1482260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1483260a9803SDavid Howells */ 1484260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1485260a9803SDavid Howells struct dentry *dentry) 1486260a9803SDavid Howells { 1487d2ddc776SDavid Howells struct afs_fs_cursor fc; 1488260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1489260a9803SDavid Howells struct key *key; 149063a4681fSDavid Howells u64 data_version; 1491260a9803SDavid Howells int ret; 1492260a9803SDavid Howells 14932b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1494260a9803SDavid Howells dvnode = AFS_FS_I(dir); 149563a4681fSDavid Howells data_version = dvnode->status.data_version; 1496260a9803SDavid Howells 14973b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1498260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1499260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1500a455589fSAl Viro dentry); 1501260a9803SDavid Howells 1502d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1503d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1504d2ddc776SDavid Howells goto error; 1505d2ddc776SDavid Howells 1506260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1507260a9803SDavid Howells if (IS_ERR(key)) { 1508260a9803SDavid Howells ret = PTR_ERR(key); 1509260a9803SDavid Howells goto error; 1510260a9803SDavid Howells } 1511260a9803SDavid Howells 1512d2ddc776SDavid Howells ret = -ERESTARTSYS; 1513d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1514d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1515d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1516bc1527dcSDavid Howells goto error_key; 1517d2ddc776SDavid Howells } 1518260a9803SDavid Howells 1519d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 152068251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 152168251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 152263a4681fSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); 1523d2ddc776SDavid Howells } 1524d2ddc776SDavid Howells 1525d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1526d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 15277de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1528260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1529d2ddc776SDavid Howells 1530d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1531d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1532d2ddc776SDavid Howells if (ret < 0) 1533d2ddc776SDavid Howells goto error_key; 15344433b691SDavid Howells } else { 15354433b691SDavid Howells goto error_key; 1536d2ddc776SDavid Howells } 1537d2ddc776SDavid Howells 153863a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 153963a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 154063a4681fSDavid Howells afs_edit_dir_for_link); 154163a4681fSDavid Howells 1542260a9803SDavid Howells key_put(key); 1543260a9803SDavid Howells _leave(" = 0"); 1544260a9803SDavid Howells return 0; 1545260a9803SDavid Howells 1546d2ddc776SDavid Howells error_key: 1547260a9803SDavid Howells key_put(key); 1548260a9803SDavid Howells error: 1549260a9803SDavid Howells d_drop(dentry); 1550260a9803SDavid Howells _leave(" = %d", ret); 1551260a9803SDavid Howells return ret; 1552260a9803SDavid Howells } 1553260a9803SDavid Howells 1554260a9803SDavid Howells /* 1555260a9803SDavid Howells * create a symlink in an AFS filesystem 1556260a9803SDavid Howells */ 1557260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1558260a9803SDavid Howells const char *content) 1559260a9803SDavid Howells { 1560d2ddc776SDavid Howells struct afs_fs_cursor fc; 1561d2ddc776SDavid Howells struct afs_file_status newstatus; 1562d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1563d2ddc776SDavid Howells struct afs_fid newfid; 1564260a9803SDavid Howells struct key *key; 156563a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1566260a9803SDavid Howells int ret; 1567260a9803SDavid Howells 15683b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1569a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1570260a9803SDavid Howells content); 1571260a9803SDavid Howells 1572d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1573d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1574d2ddc776SDavid Howells goto error; 1575d2ddc776SDavid Howells 1576260a9803SDavid Howells ret = -EINVAL; 157745222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1578260a9803SDavid Howells goto error; 1579260a9803SDavid Howells 1580260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1581260a9803SDavid Howells if (IS_ERR(key)) { 1582260a9803SDavid Howells ret = PTR_ERR(key); 1583260a9803SDavid Howells goto error; 1584260a9803SDavid Howells } 1585260a9803SDavid Howells 1586d2ddc776SDavid Howells ret = -ERESTARTSYS; 1587d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1588d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 158968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 159063a4681fSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, 159163a4681fSDavid Howells content, data_version, 1592d2ddc776SDavid Howells &newfid, &newstatus); 1593d2ddc776SDavid Howells } 1594d2ddc776SDavid Howells 1595d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1596d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1597d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1598d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1599260a9803SDavid Howells if (ret < 0) 1600d2ddc776SDavid Howells goto error_key; 16014433b691SDavid Howells } else { 16024433b691SDavid Howells goto error_key; 1603260a9803SDavid Howells } 1604260a9803SDavid Howells 160563a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 160663a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 160763a4681fSDavid Howells afs_edit_dir_for_symlink); 160863a4681fSDavid Howells 1609260a9803SDavid Howells key_put(key); 1610260a9803SDavid Howells _leave(" = 0"); 1611260a9803SDavid Howells return 0; 1612260a9803SDavid Howells 1613d2ddc776SDavid Howells error_key: 1614260a9803SDavid Howells key_put(key); 1615260a9803SDavid Howells error: 1616260a9803SDavid Howells d_drop(dentry); 1617260a9803SDavid Howells _leave(" = %d", ret); 1618260a9803SDavid Howells return ret; 1619260a9803SDavid Howells } 1620260a9803SDavid Howells 1621260a9803SDavid Howells /* 1622260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1623260a9803SDavid Howells */ 1624260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 16251cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 16261cd66c93SMiklos Szeredi unsigned int flags) 1627260a9803SDavid Howells { 1628d2ddc776SDavid Howells struct afs_fs_cursor fc; 1629260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 163079ddbfa5SDavid Howells struct dentry *tmp = NULL, *rehash = NULL; 163179ddbfa5SDavid Howells struct inode *new_inode; 1632260a9803SDavid Howells struct key *key; 163363a4681fSDavid Howells u64 orig_data_version, new_data_version; 163463a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1635260a9803SDavid Howells int ret; 1636260a9803SDavid Howells 16371cd66c93SMiklos Szeredi if (flags) 16381cd66c93SMiklos Szeredi return -EINVAL; 16391cd66c93SMiklos Szeredi 164079ddbfa5SDavid Howells /* Don't allow silly-rename files be moved around. */ 164179ddbfa5SDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 164279ddbfa5SDavid Howells return -EINVAL; 164379ddbfa5SDavid Howells 16442b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1645260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1646260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 164763a4681fSDavid Howells orig_data_version = orig_dvnode->status.data_version; 164863a4681fSDavid Howells new_data_version = new_dvnode->status.data_version; 1649260a9803SDavid Howells 16503b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1651260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1652260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1653260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1654a455589fSAl Viro new_dentry); 1655260a9803SDavid Howells 1656260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1657260a9803SDavid Howells if (IS_ERR(key)) { 1658260a9803SDavid Howells ret = PTR_ERR(key); 1659260a9803SDavid Howells goto error; 1660260a9803SDavid Howells } 1661260a9803SDavid Howells 166279ddbfa5SDavid Howells /* For non-directories, check whether the target is busy and if so, 166379ddbfa5SDavid Howells * make a copy of the dentry and then do a silly-rename. If the 166479ddbfa5SDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 166579ddbfa5SDavid Howells * new target. 166679ddbfa5SDavid Howells */ 166779ddbfa5SDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 166879ddbfa5SDavid Howells /* To prevent any new references to the target during the 166979ddbfa5SDavid Howells * rename, we unhash the dentry in advance. 167079ddbfa5SDavid Howells */ 167179ddbfa5SDavid Howells if (!d_unhashed(new_dentry)) { 167279ddbfa5SDavid Howells d_drop(new_dentry); 167379ddbfa5SDavid Howells rehash = new_dentry; 167479ddbfa5SDavid Howells } 167579ddbfa5SDavid Howells 167679ddbfa5SDavid Howells if (d_count(new_dentry) > 2) { 167779ddbfa5SDavid Howells /* copy the target dentry's name */ 167879ddbfa5SDavid Howells ret = -ENOMEM; 167979ddbfa5SDavid Howells tmp = d_alloc(new_dentry->d_parent, 168079ddbfa5SDavid Howells &new_dentry->d_name); 168179ddbfa5SDavid Howells if (!tmp) 168279ddbfa5SDavid Howells goto error_rehash; 168379ddbfa5SDavid Howells 168479ddbfa5SDavid Howells ret = afs_sillyrename(new_dvnode, 168579ddbfa5SDavid Howells AFS_FS_I(d_inode(new_dentry)), 168679ddbfa5SDavid Howells new_dentry, key); 168779ddbfa5SDavid Howells if (ret) 168879ddbfa5SDavid Howells goto error_rehash; 168979ddbfa5SDavid Howells 169079ddbfa5SDavid Howells new_dentry = tmp; 169179ddbfa5SDavid Howells rehash = NULL; 169279ddbfa5SDavid Howells new_negative = true; 169379ddbfa5SDavid Howells orig_data_version = orig_dvnode->status.data_version; 169479ddbfa5SDavid Howells new_data_version = new_dvnode->status.data_version; 169579ddbfa5SDavid Howells } 169679ddbfa5SDavid Howells } 169779ddbfa5SDavid Howells 1698d2ddc776SDavid Howells ret = -ERESTARTSYS; 1699d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1700d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1701d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1702d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 170379ddbfa5SDavid Howells goto error_rehash; 1704d2ddc776SDavid Howells } 1705d2ddc776SDavid Howells } 1706d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 170768251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 170868251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1709d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 171063a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 171163a4681fSDavid Howells orig_data_version, new_data_version); 1712d2ddc776SDavid Howells } 1713d2ddc776SDavid Howells 1714d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1715d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1716d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1717d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1718d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1719260a9803SDavid Howells if (ret < 0) 172079ddbfa5SDavid Howells goto error_rehash; 1721d2ddc776SDavid Howells } 1722d2ddc776SDavid Howells 172363a4681fSDavid Howells if (ret == 0) { 172479ddbfa5SDavid Howells if (rehash) 172579ddbfa5SDavid Howells d_rehash(rehash); 172663a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 172763a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 172879ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 172963a4681fSDavid Howells 173063a4681fSDavid Howells if (!new_negative && 173163a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 173263a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 173379ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 173463a4681fSDavid Howells 173563a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 173663a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 173779ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 173879ddbfa5SDavid Howells 173979ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 174079ddbfa5SDavid Howells if (new_inode) { 174179ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 174279ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 174379ddbfa5SDavid Howells drop_nlink(new_inode); 174479ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 174579ddbfa5SDavid Howells } 174679ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 174779ddbfa5SDavid Howells goto error_tmp; 174863a4681fSDavid Howells } 174963a4681fSDavid Howells 175079ddbfa5SDavid Howells error_rehash: 175179ddbfa5SDavid Howells if (rehash) 175279ddbfa5SDavid Howells d_rehash(rehash); 175379ddbfa5SDavid Howells error_tmp: 175479ddbfa5SDavid Howells if (tmp) 175579ddbfa5SDavid Howells dput(tmp); 1756260a9803SDavid Howells key_put(key); 1757260a9803SDavid Howells error: 1758260a9803SDavid Howells _leave(" = %d", ret); 1759260a9803SDavid Howells return ret; 1760260a9803SDavid Howells } 1761f3ddee8dSDavid Howells 1762f3ddee8dSDavid Howells /* 1763f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1764f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1765f3ddee8dSDavid Howells */ 1766f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1767f3ddee8dSDavid Howells { 1768f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1769f3ddee8dSDavid Howells 17703b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1771f3ddee8dSDavid Howells 1772f3ddee8dSDavid Howells set_page_private(page, 0); 1773f3ddee8dSDavid Howells ClearPagePrivate(page); 1774f3ddee8dSDavid Howells 1775f3ddee8dSDavid Howells /* The directory will need reloading. */ 1776f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1777f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1778f3ddee8dSDavid Howells return 1; 1779f3ddee8dSDavid Howells } 1780f3ddee8dSDavid Howells 1781f3ddee8dSDavid Howells /* 1782f3ddee8dSDavid Howells * invalidate part or all of a page 1783f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1784f3ddee8dSDavid Howells * the entire page) 1785f3ddee8dSDavid Howells */ 1786f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1787f3ddee8dSDavid Howells unsigned int length) 1788f3ddee8dSDavid Howells { 1789f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1790f3ddee8dSDavid Howells 1791f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1792f3ddee8dSDavid Howells 1793f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1794f3ddee8dSDavid Howells 1795f3ddee8dSDavid Howells /* The directory will need reloading. */ 1796f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1797f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1798f3ddee8dSDavid Howells 1799f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1800f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1801f3ddee8dSDavid Howells set_page_private(page, 0); 1802f3ddee8dSDavid Howells ClearPagePrivate(page); 1803f3ddee8dSDavid Howells } 1804f3ddee8dSDavid Howells } 1805