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); 295cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 305cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 31ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 32afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 334acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 34ebfc3b49SAl Viro bool excl); 3518bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 36260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 37260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 38260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 39260a9803SDavid Howells struct dentry *dentry); 40260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 41260a9803SDavid Howells const char *content); 42260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 431cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 441cd66c93SMiklos Szeredi unsigned int flags); 45f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 46f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 47f3ddee8dSDavid Howells unsigned int length); 48f3ddee8dSDavid Howells 49f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 50f3ddee8dSDavid Howells { 51f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 52f3ddee8dSDavid Howells } 531da177e4SLinus Torvalds 544b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 551da177e4SLinus Torvalds .open = afs_dir_open, 5600d3b7a4SDavid Howells .release = afs_release, 5729884effSAl Viro .iterate_shared = afs_readdir, 58e8d6c554SDavid Howells .lock = afs_lock, 593222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 601da177e4SLinus Torvalds }; 611da177e4SLinus Torvalds 62754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 63260a9803SDavid Howells .create = afs_create, 64260a9803SDavid Howells .lookup = afs_lookup, 65260a9803SDavid Howells .link = afs_link, 66260a9803SDavid Howells .unlink = afs_unlink, 67260a9803SDavid Howells .symlink = afs_symlink, 68260a9803SDavid Howells .mkdir = afs_mkdir, 69260a9803SDavid Howells .rmdir = afs_rmdir, 702773bf00SMiklos Szeredi .rename = afs_rename, 7100d3b7a4SDavid Howells .permission = afs_permission, 72416351f2SDavid Howells .getattr = afs_getattr, 7331143d5dSDavid Howells .setattr = afs_setattr, 74d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 77f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 78f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 79f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 80f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 81f3ddee8dSDavid Howells }; 82f3ddee8dSDavid Howells 83d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 841da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 851da177e4SLinus Torvalds .d_delete = afs_d_delete, 86260a9803SDavid Howells .d_release = afs_d_release, 87d18610b0SDavid Howells .d_automount = afs_d_automount, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 905cf9dd55SDavid Howells struct afs_lookup_one_cookie { 915cf9dd55SDavid Howells struct dir_context ctx; 925cf9dd55SDavid Howells struct qstr name; 935cf9dd55SDavid Howells bool found; 945cf9dd55SDavid Howells struct afs_fid fid; 955cf9dd55SDavid Howells }; 965cf9dd55SDavid Howells 97260a9803SDavid Howells struct afs_lookup_cookie { 981bbae9f8SAl Viro struct dir_context ctx; 991bbae9f8SAl Viro struct qstr name; 1005cf9dd55SDavid Howells bool found; 1015cf9dd55SDavid Howells bool one_only; 1025cf9dd55SDavid Howells unsigned short nr_fids; 1035cf9dd55SDavid Howells struct afs_file_status *statuses; 1045cf9dd55SDavid Howells struct afs_callback *callbacks; 1055cf9dd55SDavid Howells struct afs_fid fids[50]; 1061da177e4SLinus Torvalds }; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* 1091da177e4SLinus Torvalds * check that a directory page is valid 1101da177e4SLinus Torvalds */ 111f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 112f3ddee8dSDavid Howells loff_t i_size) 1131da177e4SLinus Torvalds { 11400317636SDavid Howells struct afs_xdr_dir_page *dbuf; 115f3ddee8dSDavid Howells loff_t latter, off; 1161da177e4SLinus Torvalds int tmp, qty; 1171da177e4SLinus Torvalds 118dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 119dab17c1aSDavid Howells * we must take care because the directory may change size under us. 120dab17c1aSDavid Howells */ 121dab17c1aSDavid Howells off = page_offset(page); 122dab17c1aSDavid Howells if (i_size <= off) 123dab17c1aSDavid Howells goto checked; 124dab17c1aSDavid Howells 125dab17c1aSDavid Howells latter = i_size - off; 1261da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1271da177e4SLinus Torvalds qty = PAGE_SIZE; 1281da177e4SLinus Torvalds else 1291da177e4SLinus Torvalds qty = latter; 13000317636SDavid Howells qty /= sizeof(union afs_xdr_dir_block); 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* check them */ 13363a4681fSDavid Howells dbuf = kmap(page); 1341da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 13500317636SDavid Howells if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 136dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 137f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 13800317636SDavid Howells ntohs(dbuf->blocks[tmp].hdr.magic)); 139f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 14063a4681fSDavid Howells kunmap(page); 141f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1421da177e4SLinus Torvalds goto error; 1431da177e4SLinus Torvalds } 14463a4681fSDavid Howells 14563a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 14663a4681fSDavid Howells * use string functions on it. The filenames in the page 14763a4681fSDavid Howells * *should* be NUL-terminated anyway. 14863a4681fSDavid Howells */ 14963a4681fSDavid Howells ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 15263a4681fSDavid Howells kunmap(page); 15363a4681fSDavid Howells 154dab17c1aSDavid Howells checked: 155f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 156be5b82dbSAl Viro return true; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds error: 159be5b82dbSAl Viro return false; 160ec26815aSDavid Howells } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds /* 163445b1028SDavid Howells * Check the contents of a directory that we've just read. 164445b1028SDavid Howells */ 165445b1028SDavid Howells static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) 166445b1028SDavid Howells { 167445b1028SDavid Howells struct afs_xdr_dir_page *dbuf; 168445b1028SDavid Howells unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); 169445b1028SDavid Howells 170445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) 171445b1028SDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) 172445b1028SDavid Howells goto bad; 173445b1028SDavid Howells return true; 174445b1028SDavid Howells 175445b1028SDavid Howells bad: 176445b1028SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", 177445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 178445b1028SDavid Howells req->file_size, req->len, req->actual_len, req->remain); 179445b1028SDavid Howells pr_warn("DIR %llx %x %x %x\n", 180445b1028SDavid Howells req->pos, req->index, req->nr_pages, req->offset); 181445b1028SDavid Howells 182445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) { 183445b1028SDavid Howells dbuf = kmap(req->pages[i]); 184445b1028SDavid Howells for (j = 0; j < qty; j++) { 185445b1028SDavid Howells union afs_xdr_dir_block *block = &dbuf->blocks[j]; 186445b1028SDavid Howells 187445b1028SDavid Howells pr_warn("[%02x] %32phN\n", i * qty + j, block); 188445b1028SDavid Howells } 189445b1028SDavid Howells kunmap(req->pages[i]); 190445b1028SDavid Howells } 191445b1028SDavid Howells return false; 192445b1028SDavid Howells } 193445b1028SDavid Howells 194445b1028SDavid Howells /* 1951da177e4SLinus Torvalds * open an AFS directory file 1961da177e4SLinus Torvalds */ 1971da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 1981da177e4SLinus Torvalds { 1991da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2001da177e4SLinus Torvalds 20100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 20200317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2031da177e4SLinus Torvalds 20408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2051da177e4SLinus Torvalds return -ENOENT; 2061da177e4SLinus Torvalds 20700d3b7a4SDavid Howells return afs_open(inode, file); 208ec26815aSDavid Howells } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds /* 211f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 212f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 213f3ddee8dSDavid Howells * get reclaimed during the iteration. 214f3ddee8dSDavid Howells */ 215f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 216b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 217f3ddee8dSDavid Howells { 218f3ddee8dSDavid Howells struct afs_read *req; 219f3ddee8dSDavid Howells loff_t i_size; 220f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 221f3ddee8dSDavid Howells int ret = -ENOMEM; 222f3ddee8dSDavid Howells 223f3ddee8dSDavid Howells retry: 224f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 225f3ddee8dSDavid Howells if (i_size < 2048) 226f51375cdSDavid Howells return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); 227f51375cdSDavid Howells if (i_size > 2048 * 1024) { 228f51375cdSDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 229f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 230f51375cdSDavid Howells } 231f3ddee8dSDavid Howells 232f3ddee8dSDavid Howells _enter("%llu", i_size); 233f3ddee8dSDavid Howells 234f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 235f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 236f3ddee8dSDavid Howells */ 237f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 238f3ddee8dSDavid Howells nr_inline = nr_pages; 239f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 240f3ddee8dSDavid Howells nr_inline = 0; 241f3ddee8dSDavid Howells 242f3ddee8dSDavid Howells req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, 243f3ddee8dSDavid Howells GFP_KERNEL); 244f3ddee8dSDavid Howells if (!req) 245f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 246f3ddee8dSDavid Howells 247f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 248f3ddee8dSDavid Howells req->nr_pages = nr_pages; 249f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 250f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 251f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 252f3ddee8dSDavid Howells if (nr_inline > 0) { 253f3ddee8dSDavid Howells req->pages = req->array; 254f3ddee8dSDavid Howells } else { 255f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 256f3ddee8dSDavid Howells GFP_KERNEL); 257f3ddee8dSDavid Howells if (!req->pages) 258f3ddee8dSDavid Howells goto error; 259f3ddee8dSDavid Howells } 260f3ddee8dSDavid Howells 261f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 262f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 263f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 264f3ddee8dSDavid Howells * need to reread the entire directory contents. 265f3ddee8dSDavid Howells */ 266f3ddee8dSDavid Howells i = 0; 267f3ddee8dSDavid Howells do { 268f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 269f3ddee8dSDavid Howells req->nr_pages - i, 270f3ddee8dSDavid Howells req->pages + i); 271f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 272f3ddee8dSDavid Howells if (n == 0) { 273f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 274f3ddee8dSDavid Howells 275f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 276f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 277f3ddee8dSDavid Howells 278f3ddee8dSDavid Howells ret = -ENOMEM; 279f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 280f3ddee8dSDavid Howells if (!req->pages[i]) 281f3ddee8dSDavid Howells goto error; 282f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 283f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 284f3ddee8dSDavid Howells i, gfp); 285f3ddee8dSDavid Howells if (ret < 0) 286f3ddee8dSDavid Howells goto error; 287f3ddee8dSDavid Howells 288f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 289f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 290f3ddee8dSDavid Howells unlock_page(req->pages[i]); 291f3ddee8dSDavid Howells i++; 292f3ddee8dSDavid Howells } else { 293f3ddee8dSDavid Howells i += n; 294f3ddee8dSDavid Howells } 295f3ddee8dSDavid Howells } while (i < req->nr_pages); 296f3ddee8dSDavid Howells 297f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 298f3ddee8dSDavid Howells * races. 299f3ddee8dSDavid Howells */ 300f3ddee8dSDavid Howells ret = -ERESTARTSYS; 301b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 302b61f7dcfSDavid Howells goto error; 303f3ddee8dSDavid Howells 304f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 305f3ddee8dSDavid Howells goto success; 306f3ddee8dSDavid Howells 307b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 308b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 309b61f7dcfSDavid Howells goto error; 310b61f7dcfSDavid Howells 311b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 312f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 313f3ddee8dSDavid Howells if (ret < 0) 314b61f7dcfSDavid Howells goto error_unlock; 315f3ddee8dSDavid Howells 316f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 317f3ddee8dSDavid Howells 318f3ddee8dSDavid Howells if (req->len < req->file_size) 319f3ddee8dSDavid Howells goto content_has_grown; 320f3ddee8dSDavid Howells 321f3ddee8dSDavid Howells /* Validate the data we just read. */ 322f3ddee8dSDavid Howells ret = -EIO; 323445b1028SDavid Howells if (!afs_dir_check_pages(dvnode, req)) 324b61f7dcfSDavid Howells goto error_unlock; 325f3ddee8dSDavid Howells 326f3ddee8dSDavid Howells // TODO: Trim excess pages 327f3ddee8dSDavid Howells 328f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 329f3ddee8dSDavid Howells } 330f3ddee8dSDavid Howells 331b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 332f3ddee8dSDavid Howells success: 333f3ddee8dSDavid Howells return req; 334f3ddee8dSDavid Howells 335f3ddee8dSDavid Howells error_unlock: 336b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 337f3ddee8dSDavid Howells error: 338f3ddee8dSDavid Howells afs_put_read(req); 339f3ddee8dSDavid Howells _leave(" = %d", ret); 340f3ddee8dSDavid Howells return ERR_PTR(ret); 341f3ddee8dSDavid Howells 342f3ddee8dSDavid Howells content_has_grown: 343b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 344f3ddee8dSDavid Howells afs_put_read(req); 345f3ddee8dSDavid Howells goto retry; 346f3ddee8dSDavid Howells } 347f3ddee8dSDavid Howells 348f3ddee8dSDavid Howells /* 3491da177e4SLinus Torvalds * deal with one block in an AFS directory 3501da177e4SLinus Torvalds */ 351f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 352f51375cdSDavid Howells struct dir_context *ctx, 35300317636SDavid Howells union afs_xdr_dir_block *block, 3541bbae9f8SAl Viro unsigned blkoff) 3551da177e4SLinus Torvalds { 35600317636SDavid Howells union afs_xdr_dirent *dire; 3571da177e4SLinus Torvalds unsigned offset, next, curr; 3581da177e4SLinus Torvalds size_t nlen; 3591bbae9f8SAl Viro int tmp; 3601da177e4SLinus Torvalds 3611bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3621da177e4SLinus Torvalds 36300317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3664ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3674ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3681da177e4SLinus Torvalds offset = next 3691da177e4SLinus Torvalds ) { 3701da177e4SLinus Torvalds next = offset + 1; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 37300317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3741da177e4SLinus Torvalds (1 << (offset % 8)))) { 3755b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 37600317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3771da177e4SLinus Torvalds if (offset >= curr) 3781bbae9f8SAl Viro ctx->pos = blkoff + 37900317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3801da177e4SLinus Torvalds continue; 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* got a valid entry */ 3841da177e4SLinus Torvalds dire = &block->dirents[offset]; 3851da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3861da177e4SLinus Torvalds sizeof(*block) - 38700317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3881da177e4SLinus Torvalds 3895b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 39000317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3911da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3921da177e4SLinus Torvalds nlen, dire->u.name); 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds /* work out where the next possible entry is */ 39500317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3964ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 3975b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3981da177e4SLinus Torvalds " %u travelled beyond end dir block" 3995b5e0928SAlexey Dobriyan " (len %u/%zu)", 40000317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4011da177e4SLinus Torvalds offset, next, tmp, nlen); 402f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4031da177e4SLinus Torvalds } 40400317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 4051da177e4SLinus Torvalds (1 << (next % 8)))) { 4065b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4075b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 40800317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4091da177e4SLinus Torvalds offset, next, tmp, nlen); 410f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4135b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 41400317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4151da177e4SLinus Torvalds next, tmp, nlen); 4161da177e4SLinus Torvalds next++; 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* skip if starts before the current position */ 4201da177e4SLinus Torvalds if (offset < curr) 4211da177e4SLinus Torvalds continue; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* found the next entry */ 4241bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4251da177e4SLinus Torvalds ntohl(dire->u.vnode), 4265cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4275cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4281bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4291da177e4SLinus Torvalds _leave(" = 0 [full]"); 4301da177e4SLinus Torvalds return 0; 4311da177e4SLinus Torvalds } 4321da177e4SLinus Torvalds 43300317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds _leave(" = 1 [more]"); 4371da177e4SLinus Torvalds return 1; 438ec26815aSDavid Howells } 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds /* 44108e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4421da177e4SLinus Torvalds */ 4431bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4441bbae9f8SAl Viro struct key *key) 4451da177e4SLinus Torvalds { 446f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 44700317636SDavid Howells struct afs_xdr_dir_page *dbuf; 44800317636SDavid Howells union afs_xdr_dir_block *dblock; 449f3ddee8dSDavid Howells struct afs_read *req; 4501da177e4SLinus Torvalds struct page *page; 4511da177e4SLinus Torvalds unsigned blkoff, limit; 4521da177e4SLinus Torvalds int ret; 4531da177e4SLinus Torvalds 4541bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4551da177e4SLinus Torvalds 45608e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4571da177e4SLinus Torvalds _leave(" = -ESTALE"); 4581da177e4SLinus Torvalds return -ESTALE; 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 461f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 462f3ddee8dSDavid Howells if (IS_ERR(req)) 463f3ddee8dSDavid Howells return PTR_ERR(req); 464f3ddee8dSDavid Howells 4651da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 46600317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 46700317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4701da177e4SLinus Torvalds ret = 0; 471f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 47200317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4731da177e4SLinus Torvalds 474f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 475f3ddee8dSDavid Howells * to the LRU. 476f3ddee8dSDavid Howells */ 477f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 478f3ddee8dSDavid Howells if (!page) { 479f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 4801da177e4SLinus Torvalds break; 4811da177e4SLinus Torvalds } 482f3ddee8dSDavid Howells mark_page_accessed(page); 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4851da177e4SLinus Torvalds 486f3ddee8dSDavid Howells dbuf = kmap(page); 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4891da177e4SLinus Torvalds do { 4901da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 49100317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 492f51375cdSDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); 4931da177e4SLinus Torvalds if (ret != 1) { 494f3ddee8dSDavid Howells kunmap(page); 4951da177e4SLinus Torvalds goto out; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 49800317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 4991da177e4SLinus Torvalds 5001bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 5011da177e4SLinus Torvalds 502f3ddee8dSDavid Howells kunmap(page); 5031da177e4SLinus Torvalds ret = 0; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds out: 507b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 508f3ddee8dSDavid Howells afs_put_read(req); 5091da177e4SLinus Torvalds _leave(" = %d", ret); 5101da177e4SLinus Torvalds return ret; 511ec26815aSDavid Howells } 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds /* 5141da177e4SLinus Torvalds * read an AFS directory 5151da177e4SLinus Torvalds */ 5161bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5171da177e4SLinus Torvalds { 518215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 519ec26815aSDavid Howells } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* 5225cf9dd55SDavid Howells * Search the directory for a single name 5231da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5241da177e4SLinus Torvalds * uniquifier through dtype 5251da177e4SLinus Torvalds */ 5265cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 527ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5281da177e4SLinus Torvalds { 5295cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5305cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5311da177e4SLinus Torvalds 5321bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5331bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 534ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5351da177e4SLinus Torvalds 53608e0e7c8SDavid Howells /* insanity checks first */ 53700317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 53800317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 53908e0e7c8SDavid Howells 5401bbae9f8SAl Viro if (cookie->name.len != nlen || 5411bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5421da177e4SLinus Torvalds _leave(" = 0 [no]"); 5431da177e4SLinus Torvalds return 0; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds cookie->fid.vnode = ino; 5471da177e4SLinus Torvalds cookie->fid.unique = dtype; 5481da177e4SLinus Torvalds cookie->found = 1; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds _leave(" = -1 [found]"); 5511da177e4SLinus Torvalds return -1; 552ec26815aSDavid Howells } 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds /* 5555cf9dd55SDavid Howells * Do a lookup of a single name in a directory 556260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5571da177e4SLinus Torvalds */ 5585cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 55900d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 5601da177e4SLinus Torvalds { 5611bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5625cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5635cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5641bbae9f8SAl Viro .name = dentry->d_name, 5651bbae9f8SAl Viro .fid.vid = as->volume->vid 5661bbae9f8SAl Viro }; 5671da177e4SLinus Torvalds int ret; 5681da177e4SLinus Torvalds 569a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds /* search the directory */ 5721bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 5731da177e4SLinus Torvalds if (ret < 0) { 57408e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 57508e0e7c8SDavid Howells return ret; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds ret = -ENOENT; 5791da177e4SLinus Torvalds if (!cookie.found) { 58008e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58108e0e7c8SDavid Howells return -ENOENT; 58208e0e7c8SDavid Howells } 58308e0e7c8SDavid Howells 58408e0e7c8SDavid Howells *fid = cookie.fid; 5853b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 58608e0e7c8SDavid Howells return 0; 58708e0e7c8SDavid Howells } 58808e0e7c8SDavid Howells 58908e0e7c8SDavid Howells /* 5905cf9dd55SDavid Howells * search the directory for a name 5915cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5925cf9dd55SDavid Howells * uniquifier through dtype 5935cf9dd55SDavid Howells */ 5945cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5955cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5965cf9dd55SDavid Howells { 5975cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 5985cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 5995cf9dd55SDavid Howells int ret; 6005cf9dd55SDavid Howells 6015cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6025cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6035cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6045cf9dd55SDavid Howells 6055cf9dd55SDavid Howells /* insanity checks first */ 60600317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 60700317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6085cf9dd55SDavid Howells 6095cf9dd55SDavid Howells if (cookie->found) { 6105cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6115cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6125cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6135cf9dd55SDavid Howells cookie->nr_fids++; 6145cf9dd55SDavid Howells } 6155cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6165cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 6175cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 6185cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 6195cf9dd55SDavid Howells cookie->found = 1; 6205cf9dd55SDavid Howells if (cookie->one_only) 6215cf9dd55SDavid Howells return -1; 6225cf9dd55SDavid Howells } 6235cf9dd55SDavid Howells 6245cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6255cf9dd55SDavid Howells _leave(" = %d", ret); 6265cf9dd55SDavid Howells return ret; 6275cf9dd55SDavid Howells } 6285cf9dd55SDavid Howells 6295cf9dd55SDavid Howells /* 6305cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 6315cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 6325cf9dd55SDavid Howells * asked for is returned. 6335cf9dd55SDavid Howells */ 6345cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6355cf9dd55SDavid Howells struct key *key) 6365cf9dd55SDavid Howells { 6375cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 6385cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 6395cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 6405cf9dd55SDavid Howells struct afs_iget_data data; 6415cf9dd55SDavid Howells struct afs_fs_cursor fc; 6425cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 6435cf9dd55SDavid Howells struct inode *inode = NULL; 6445cf9dd55SDavid Howells int ret, i; 6455cf9dd55SDavid Howells 6465cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6475cf9dd55SDavid Howells 6485cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6495cf9dd55SDavid Howells if (!cookie) 6505cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6515cf9dd55SDavid Howells 6525cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6535cf9dd55SDavid Howells cookie->name = dentry->d_name; 6545cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6555cf9dd55SDavid Howells 6565cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 6575cf9dd55SDavid Howells if (dvnode->cb_interest && 6585cf9dd55SDavid Howells dvnode->cb_interest->server && 6595cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 6605cf9dd55SDavid Howells cookie->one_only = true; 6615cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6625cf9dd55SDavid Howells 6635cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6645cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6655cf9dd55SDavid Howells 6665cf9dd55SDavid Howells /* search the directory */ 6675cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 6685cf9dd55SDavid Howells if (ret < 0) { 6695cf9dd55SDavid Howells inode = ERR_PTR(ret); 6705cf9dd55SDavid Howells goto out; 6715cf9dd55SDavid Howells } 6725cf9dd55SDavid Howells 6735cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6745cf9dd55SDavid Howells if (!cookie->found) 6755cf9dd55SDavid Howells goto out; 6765cf9dd55SDavid Howells 6775cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 6785cf9dd55SDavid Howells data.volume = dvnode->volume; 6795cf9dd55SDavid Howells data.fid = cookie->fids[0]; 6805cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 6815cf9dd55SDavid Howells if (inode) 6825cf9dd55SDavid Howells goto out; 6835cf9dd55SDavid Howells 6845cf9dd55SDavid Howells /* Need space for examining all the selected files */ 6855cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 6865cf9dd55SDavid Howells cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), 6875cf9dd55SDavid Howells GFP_KERNEL); 6885cf9dd55SDavid Howells if (!cookie->statuses) 6895cf9dd55SDavid Howells goto out; 6905cf9dd55SDavid Howells 6915cf9dd55SDavid Howells cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), 6925cf9dd55SDavid Howells GFP_KERNEL); 6935cf9dd55SDavid Howells if (!cookie->callbacks) 6945cf9dd55SDavid Howells goto out_s; 6955cf9dd55SDavid Howells 6965cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 6975cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 6985cf9dd55SDavid Howells * the whole operation. 6995cf9dd55SDavid Howells */ 7005cf9dd55SDavid Howells if (cookie->one_only) 7015cf9dd55SDavid Howells goto no_inline_bulk_status; 7025cf9dd55SDavid Howells 7035cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 7045cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7055cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7065cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 7075cf9dd55SDavid Howells &fc.cbi->server->flags)) { 7085cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 7095cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 7105cf9dd55SDavid Howells break; 7115cf9dd55SDavid Howells } 7125cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 7135cf9dd55SDavid Howells afs_v2net(dvnode), 7145cf9dd55SDavid Howells cookie->fids, 7155cf9dd55SDavid Howells cookie->statuses, 7165cf9dd55SDavid Howells cookie->callbacks, 7175cf9dd55SDavid Howells cookie->nr_fids, NULL); 7185cf9dd55SDavid Howells } 7195cf9dd55SDavid Howells 7205cf9dd55SDavid Howells if (fc.ac.error == 0) 7215cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7225cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 7235cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 7245cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7255cf9dd55SDavid Howells } 7265cf9dd55SDavid Howells 7275cf9dd55SDavid Howells if (!IS_ERR(inode)) 7285cf9dd55SDavid Howells goto success; 7295cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 7305cf9dd55SDavid Howells goto out_c; 7315cf9dd55SDavid Howells 7325cf9dd55SDavid Howells no_inline_bulk_status: 7335cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7345cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7355cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7365cf9dd55SDavid Howells */ 7375cf9dd55SDavid Howells cookie->nr_fids = 1; 7385cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 7395cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7405cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7415cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7425cf9dd55SDavid Howells afs_v2net(dvnode), 7435cf9dd55SDavid Howells cookie->fids, 7445cf9dd55SDavid Howells cookie->statuses, 7455cf9dd55SDavid Howells cookie->callbacks, 7465cf9dd55SDavid Howells NULL); 7475cf9dd55SDavid Howells } 7485cf9dd55SDavid Howells 7495cf9dd55SDavid Howells if (fc.ac.error == 0) 7505cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7515cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7525cf9dd55SDavid Howells } 7535cf9dd55SDavid Howells 7545cf9dd55SDavid Howells if (IS_ERR(inode)) 7555cf9dd55SDavid Howells goto out_c; 7565cf9dd55SDavid Howells 7575cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 7585cf9dd55SDavid Howells cookie->statuses[i].abort_code = 0; 7595cf9dd55SDavid Howells 7605cf9dd55SDavid Howells success: 7615cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7625cf9dd55SDavid Howells * one we actually want. 7635cf9dd55SDavid Howells */ 7645cf9dd55SDavid Howells if (cookie->statuses[0].abort_code != 0) 7655cf9dd55SDavid Howells inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); 7665cf9dd55SDavid Howells 7675cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 7685cf9dd55SDavid Howells struct inode *ti; 7695cf9dd55SDavid Howells 7705cf9dd55SDavid Howells if (cookie->statuses[i].abort_code != 0) 7715cf9dd55SDavid Howells continue; 7725cf9dd55SDavid Howells 7735cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 7745cf9dd55SDavid Howells &cookie->statuses[i], 7755cf9dd55SDavid Howells &cookie->callbacks[i], 7765cf9dd55SDavid Howells cbi); 7775cf9dd55SDavid Howells if (i == 0) { 7785cf9dd55SDavid Howells inode = ti; 7795cf9dd55SDavid Howells } else { 7805cf9dd55SDavid Howells if (!IS_ERR(ti)) 7815cf9dd55SDavid Howells iput(ti); 7825cf9dd55SDavid Howells } 7835cf9dd55SDavid Howells } 7845cf9dd55SDavid Howells 7855cf9dd55SDavid Howells out_c: 7865cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 7875cf9dd55SDavid Howells kfree(cookie->callbacks); 7885cf9dd55SDavid Howells out_s: 7895cf9dd55SDavid Howells kfree(cookie->statuses); 7905cf9dd55SDavid Howells out: 7915cf9dd55SDavid Howells kfree(cookie); 7925cf9dd55SDavid Howells return inode; 7935cf9dd55SDavid Howells } 7945cf9dd55SDavid Howells 7955cf9dd55SDavid Howells /* 7966f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 7976f8880d8SDavid Howells */ 7986f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 7996f8880d8SDavid Howells struct key *key) 8006f8880d8SDavid Howells { 8016f8880d8SDavid Howells struct afs_sysnames *subs; 8026f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8036f8880d8SDavid Howells struct dentry *ret; 8046f8880d8SDavid Howells char *buf, *p, *name; 8056f8880d8SDavid Howells int len, i; 8066f8880d8SDavid Howells 8076f8880d8SDavid Howells _enter(""); 8086f8880d8SDavid Howells 8096f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8106f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8116f8880d8SDavid Howells if (!buf) 8126f8880d8SDavid Howells goto out_p; 8136f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8146f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8156f8880d8SDavid Howells p += dentry->d_name.len - 4; 8166f8880d8SDavid Howells } 8176f8880d8SDavid Howells 8186f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8196f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8206f8880d8SDavid Howells subs = net->sysnames; 8216f8880d8SDavid Howells refcount_inc(&subs->usage); 8226f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8236f8880d8SDavid Howells 8246f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8256f8880d8SDavid Howells name = subs->subs[i]; 8266f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8276f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8286f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8296f8880d8SDavid Howells goto out_s; 8306f8880d8SDavid Howells } 8316f8880d8SDavid Howells 8326f8880d8SDavid Howells strcpy(p, name); 8336f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8346f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8356f8880d8SDavid Howells goto out_s; 8366f8880d8SDavid Howells dput(ret); 8376f8880d8SDavid Howells } 8386f8880d8SDavid Howells 8396f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8406f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8416f8880d8SDavid Howells */ 8426f8880d8SDavid Howells ret = NULL; 8436f8880d8SDavid Howells out_s: 8446f8880d8SDavid Howells afs_put_sysnames(subs); 8456f8880d8SDavid Howells kfree(buf); 8466f8880d8SDavid Howells out_p: 8476f8880d8SDavid Howells key_put(key); 8486f8880d8SDavid Howells return ret; 8496f8880d8SDavid Howells } 8506f8880d8SDavid Howells 8516f8880d8SDavid Howells /* 85208e0e7c8SDavid Howells * look up an entry in a directory 85308e0e7c8SDavid Howells */ 854260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 85500cd8dd3SAl Viro unsigned int flags) 85608e0e7c8SDavid Howells { 8575cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 85808e0e7c8SDavid Howells struct inode *inode; 85934b2a88fSAl Viro struct dentry *d; 86000d3b7a4SDavid Howells struct key *key; 86108e0e7c8SDavid Howells int ret; 86208e0e7c8SDavid Howells 8633b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 8645cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 865260a9803SDavid Howells 8662b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 86708e0e7c8SDavid Howells 86845222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 86908e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 87008e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 87108e0e7c8SDavid Howells } 87208e0e7c8SDavid Howells 8735cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 87408e0e7c8SDavid Howells _leave(" = -ESTALE"); 87508e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 87608e0e7c8SDavid Howells } 87708e0e7c8SDavid Howells 8785cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 87900d3b7a4SDavid Howells if (IS_ERR(key)) { 88000d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 881e231c2eeSDavid Howells return ERR_CAST(key); 88200d3b7a4SDavid Howells } 88300d3b7a4SDavid Howells 8845cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 88508e0e7c8SDavid Howells if (ret < 0) { 88600d3b7a4SDavid Howells key_put(key); 887260a9803SDavid Howells _leave(" = %d [val]", ret); 8881da177e4SLinus Torvalds return ERR_PTR(ret); 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 8916f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8926f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8936f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 8946f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 8956f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 8966f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 8976f8880d8SDavid Howells 898d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 8995cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 90034b2a88fSAl Viro key_put(key); 90134b2a88fSAl Viro if (inode == ERR_PTR(-ENOENT)) { 9025cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 90334b2a88fSAl Viro } else { 90434b2a88fSAl Viro dentry->d_fsdata = 90534b2a88fSAl Viro (void *)(unsigned long)dvnode->status.data_version; 906bec5eb61Swanglei } 90734b2a88fSAl Viro d = d_splice_alias(inode, dentry); 90834b2a88fSAl Viro if (!IS_ERR_OR_NULL(d)) 90934b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 91034b2a88fSAl Viro return d; 911ec26815aSDavid Howells } 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds /* 9141da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 9151da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 9161da177e4SLinus Torvalds * inode 9171da177e4SLinus Torvalds */ 9180b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 9191da177e4SLinus Torvalds { 920260a9803SDavid Howells struct afs_vnode *vnode, *dir; 921dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 9221da177e4SLinus Torvalds struct dentry *parent; 923c435ee34SDavid Howells struct inode *inode; 92400d3b7a4SDavid Howells struct key *key; 925a4ff7401SDavid Howells long dir_version, de_version; 9261da177e4SLinus Torvalds int ret; 9271da177e4SLinus Torvalds 9280b728e19SAl Viro if (flags & LOOKUP_RCU) 92934286d66SNick Piggin return -ECHILD; 93034286d66SNick Piggin 931c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9322b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 9333b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 934a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 935260a9803SDavid Howells vnode->flags); 936c435ee34SDavid Howells } else { 937a455589fSAl Viro _enter("{neg n=%pd}", dentry); 938c435ee34SDavid Howells } 9391da177e4SLinus Torvalds 940260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 94100d3b7a4SDavid Howells if (IS_ERR(key)) 94200d3b7a4SDavid Howells key = NULL; 94300d3b7a4SDavid Howells 944c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 945c435ee34SDavid Howells inode = d_inode(dentry); 946c435ee34SDavid Howells if (inode) { 947c435ee34SDavid Howells vnode = AFS_FS_I(inode); 948c435ee34SDavid Howells afs_validate(vnode, key); 949c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 950c435ee34SDavid Howells goto out_bad; 951c435ee34SDavid Howells } 952c435ee34SDavid Howells } 953c435ee34SDavid Howells 9541da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 95508e0e7c8SDavid Howells parent = dget_parent(dentry); 9562b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9571da177e4SLinus Torvalds 958260a9803SDavid Howells /* validate the parent directory */ 959260a9803SDavid Howells afs_validate(dir, key); 960260a9803SDavid Howells 961260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 962a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 963c435ee34SDavid Howells goto out_bad_parent; 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 966a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 967a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 968a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 969a4ff7401SDavid Howells * version. 970a4ff7401SDavid Howells */ 971a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 972a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 973a4ff7401SDavid Howells if (de_version == dir_version) 974a4ff7401SDavid Howells goto out_valid; 975a4ff7401SDavid Howells 976a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 977a4ff7401SDavid Howells if (de_version - dir_version >= 0) 978a4ff7401SDavid Howells goto out_valid; 979260a9803SDavid Howells 98008e0e7c8SDavid Howells _debug("dir modified"); 981d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds /* search the directory for this vnode */ 9845cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 985260a9803SDavid Howells switch (ret) { 986260a9803SDavid Howells case 0: 987260a9803SDavid Howells /* the filename maps to something */ 9882b0143b5SDavid Howells if (d_really_is_negative(dentry)) 989c435ee34SDavid Howells goto out_bad_parent; 990c435ee34SDavid Howells inode = d_inode(dentry); 991c435ee34SDavid Howells if (is_bad_inode(inode)) { 992a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 993a455589fSAl Viro dentry); 994c435ee34SDavid Howells goto out_bad_parent; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds 997c435ee34SDavid Howells vnode = AFS_FS_I(inode); 998c435ee34SDavid Howells 9991da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 10001da177e4SLinus Torvalds * different file */ 100108e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 10023b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1003a455589fSAl Viro dentry, fid.vnode, 100408e0e7c8SDavid Howells vnode->fid.vnode); 10051da177e4SLinus Torvalds goto not_found; 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1009260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1010260a9803SDavid Howells * been reused */ 101108e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1012a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1013a455589fSAl Viro dentry, fid.unique, 10147a224228SJean Noel Cordenner vnode->fid.unique, 1015c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1016c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 101708e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1018c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1019260a9803SDavid Howells goto not_found; 1020260a9803SDavid Howells } 1021260a9803SDavid Howells goto out_valid; 1022260a9803SDavid Howells 1023260a9803SDavid Howells case -ENOENT: 1024260a9803SDavid Howells /* the filename is unknown */ 1025a455589fSAl Viro _debug("%pd: dirent not found", dentry); 10262b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1027260a9803SDavid Howells goto not_found; 1028260a9803SDavid Howells goto out_valid; 1029260a9803SDavid Howells 1030260a9803SDavid Howells default: 1031a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1032a455589fSAl Viro parent, ret); 1033c435ee34SDavid Howells goto out_bad_parent; 10341da177e4SLinus Torvalds } 103508e0e7c8SDavid Howells 10361da177e4SLinus Torvalds out_valid: 1037a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10381da177e4SLinus Torvalds dput(parent); 103900d3b7a4SDavid Howells key_put(key); 10401da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10411da177e4SLinus Torvalds return 1; 10421da177e4SLinus Torvalds 10431da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10441da177e4SLinus Torvalds not_found: 10451da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10461da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10471da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10481da177e4SLinus Torvalds 1049c435ee34SDavid Howells out_bad_parent: 1050a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10511da177e4SLinus Torvalds dput(parent); 1052c435ee34SDavid Howells out_bad: 105300d3b7a4SDavid Howells key_put(key); 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10561da177e4SLinus Torvalds return 0; 1057ec26815aSDavid Howells } 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds /* 10601da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10611da177e4SLinus Torvalds * sleep) 10621da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10631da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10641da177e4SLinus Torvalds */ 1065fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10661da177e4SLinus Torvalds { 1067a455589fSAl Viro _enter("%pd", dentry); 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10701da177e4SLinus Torvalds goto zap; 10711da177e4SLinus Torvalds 10722b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10732b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10742b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10751da177e4SLinus Torvalds goto zap; 10761da177e4SLinus Torvalds 10771da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10781da177e4SLinus Torvalds return 0; 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds zap: 10811da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10821da177e4SLinus Torvalds return 1; 1083ec26815aSDavid Howells } 1084260a9803SDavid Howells 1085260a9803SDavid Howells /* 1086260a9803SDavid Howells * handle dentry release 1087260a9803SDavid Howells */ 108866c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1089260a9803SDavid Howells { 1090a455589fSAl Viro _enter("%pd", dentry); 1091260a9803SDavid Howells } 1092260a9803SDavid Howells 1093260a9803SDavid Howells /* 1094d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1095d2ddc776SDavid Howells */ 1096d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1097d2ddc776SDavid Howells struct dentry *new_dentry, 1098d2ddc776SDavid Howells struct afs_fid *newfid, 1099d2ddc776SDavid Howells struct afs_file_status *newstatus, 1100d2ddc776SDavid Howells struct afs_callback *newcb) 1101d2ddc776SDavid Howells { 11025a813276SDavid Howells struct afs_vnode *vnode; 1103d2ddc776SDavid Howells struct inode *inode; 1104d2ddc776SDavid Howells 1105d2ddc776SDavid Howells if (fc->ac.error < 0) 1106d2ddc776SDavid Howells return; 1107d2ddc776SDavid Howells 1108d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1109d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1110d2ddc776SDavid Howells if (IS_ERR(inode)) { 1111d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1112d2ddc776SDavid Howells * the new directory on the server. 1113d2ddc776SDavid Howells */ 1114d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1115d2ddc776SDavid Howells return; 1116d2ddc776SDavid Howells } 1117d2ddc776SDavid Howells 11185a813276SDavid Howells vnode = AFS_FS_I(inode); 11195a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 112000671912SDavid Howells afs_vnode_commit_status(fc, vnode, 0); 112173116df7SDavid Howells d_instantiate(new_dentry, inode); 1122d2ddc776SDavid Howells } 1123d2ddc776SDavid Howells 1124d2ddc776SDavid Howells /* 1125260a9803SDavid Howells * create a directory on an AFS filesystem 1126260a9803SDavid Howells */ 112718bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1128260a9803SDavid Howells { 1129d2ddc776SDavid Howells struct afs_file_status newstatus; 1130d2ddc776SDavid Howells struct afs_fs_cursor fc; 1131d2ddc776SDavid Howells struct afs_callback newcb; 1132d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1133d2ddc776SDavid Howells struct afs_fid newfid; 1134260a9803SDavid Howells struct key *key; 113563a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1136260a9803SDavid Howells int ret; 1137260a9803SDavid Howells 1138d2ddc776SDavid Howells mode |= S_IFDIR; 1139260a9803SDavid Howells 11403b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1141a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1142260a9803SDavid Howells 1143260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1144260a9803SDavid Howells if (IS_ERR(key)) { 1145260a9803SDavid Howells ret = PTR_ERR(key); 1146260a9803SDavid Howells goto error; 1147260a9803SDavid Howells } 1148260a9803SDavid Howells 1149d2ddc776SDavid Howells ret = -ERESTARTSYS; 1150d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1151d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 115268251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 115363a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1154d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1155d2ddc776SDavid Howells } 1156d2ddc776SDavid Howells 1157d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1158d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1159d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1160d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1161260a9803SDavid Howells if (ret < 0) 1162d2ddc776SDavid Howells goto error_key; 11634433b691SDavid Howells } else { 11644433b691SDavid Howells goto error_key; 1165260a9803SDavid Howells } 1166260a9803SDavid Howells 116763a4681fSDavid Howells if (ret == 0 && 116863a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 116963a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 117063a4681fSDavid Howells afs_edit_dir_for_create); 117163a4681fSDavid Howells 1172260a9803SDavid Howells key_put(key); 1173260a9803SDavid Howells _leave(" = 0"); 1174260a9803SDavid Howells return 0; 1175260a9803SDavid Howells 1176d2ddc776SDavid Howells error_key: 1177260a9803SDavid Howells key_put(key); 1178260a9803SDavid Howells error: 1179260a9803SDavid Howells d_drop(dentry); 1180260a9803SDavid Howells _leave(" = %d", ret); 1181260a9803SDavid Howells return ret; 1182260a9803SDavid Howells } 1183260a9803SDavid Howells 1184260a9803SDavid Howells /* 1185d2ddc776SDavid Howells * Remove a subdir from a directory. 1186260a9803SDavid Howells */ 1187d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1188260a9803SDavid Howells { 11892b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1190d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1191d2ddc776SDavid Howells 1192260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1193260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1194c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 119563a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1196260a9803SDavid Howells } 1197260a9803SDavid Howells } 1198260a9803SDavid Howells 1199260a9803SDavid Howells /* 1200d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1201260a9803SDavid Howells */ 1202d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1203260a9803SDavid Howells { 1204d2ddc776SDavid Howells struct afs_fs_cursor fc; 1205f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1206260a9803SDavid Howells struct key *key; 120763a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1208260a9803SDavid Howells int ret; 1209260a9803SDavid Howells 12103b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1211a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1212260a9803SDavid Howells 1213260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1214260a9803SDavid Howells if (IS_ERR(key)) { 1215260a9803SDavid Howells ret = PTR_ERR(key); 1216260a9803SDavid Howells goto error; 1217260a9803SDavid Howells } 1218260a9803SDavid Howells 1219f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1220f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1221f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1222f58db83fSDavid Howells ret = afs_validate(vnode, key); 1223f58db83fSDavid Howells if (ret < 0) 1224f58db83fSDavid Howells goto error_key; 1225f58db83fSDavid Howells } 1226f58db83fSDavid Howells 1227d2ddc776SDavid Howells ret = -ERESTARTSYS; 1228d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1229d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 123068251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 123130062bd1SDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, true, 123263a4681fSDavid Howells data_version); 1233260a9803SDavid Howells } 1234260a9803SDavid Howells 1235d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1236d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 123763a4681fSDavid Howells if (ret == 0) { 1238d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 123963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 124063a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 124163a4681fSDavid Howells afs_edit_dir_for_rmdir); 124263a4681fSDavid Howells } 1243260a9803SDavid Howells } 1244260a9803SDavid Howells 1245f58db83fSDavid Howells error_key: 1246260a9803SDavid Howells key_put(key); 1247d2ddc776SDavid Howells error: 1248d2ddc776SDavid Howells return ret; 1249d2ddc776SDavid Howells } 1250260a9803SDavid Howells 1251d2ddc776SDavid Howells /* 1252d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1253d2ddc776SDavid Howells * 1254d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1255d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1256d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1257d2ddc776SDavid Howells * 1258d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1259d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1260d2ddc776SDavid Howells */ 1261440fbc3aSDavid Howells static int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1262440fbc3aSDavid Howells unsigned long d_version_before, 1263440fbc3aSDavid Howells unsigned long d_version_after) 1264d2ddc776SDavid Howells { 1265440fbc3aSDavid Howells bool dir_valid; 1266d2ddc776SDavid Howells int ret = 0; 1267d2ddc776SDavid Howells 1268440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1269440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1270440fbc3aSDavid Howells */ 1271440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1272440fbc3aSDavid Howells 1273d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1274d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1275d2ddc776SDavid Howells 127630062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 127730062bd1SDavid Howells /* Already done */ 127830062bd1SDavid Howells } else if (dir_valid) { 1279440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1280440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1281440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1282440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1283440fbc3aSDavid Howells } 1284440fbc3aSDavid Howells ret = 0; 1285440fbc3aSDavid Howells } else { 1286440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1287440fbc3aSDavid Howells 1288d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1289d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1290d2ddc776SDavid Howells 1291d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1292d2ddc776SDavid Howells if (ret == -ESTALE) 1293d2ddc776SDavid Howells ret = 0; 1294440fbc3aSDavid Howells } 1295d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1296d2ddc776SDavid Howells } 1297d2ddc776SDavid Howells 1298d2ddc776SDavid Howells return ret; 1299d2ddc776SDavid Howells } 1300d2ddc776SDavid Howells 1301d2ddc776SDavid Howells /* 1302d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1303d2ddc776SDavid Howells */ 1304d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1305d2ddc776SDavid Howells { 1306d2ddc776SDavid Howells struct afs_fs_cursor fc; 130730062bd1SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1308d2ddc776SDavid Howells struct key *key; 1309440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 131063a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1311d2ddc776SDavid Howells int ret; 1312d2ddc776SDavid Howells 13133b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1314d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1315d2ddc776SDavid Howells 1316d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1317d2ddc776SDavid Howells return -ENAMETOOLONG; 1318d2ddc776SDavid Howells 1319d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1320d2ddc776SDavid Howells if (IS_ERR(key)) { 1321d2ddc776SDavid Howells ret = PTR_ERR(key); 1322d2ddc776SDavid Howells goto error; 1323d2ddc776SDavid Howells } 1324d2ddc776SDavid Howells 1325d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1326d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1327d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1328d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1329d2ddc776SDavid Howells if (ret < 0) 1330d2ddc776SDavid Howells goto error_key; 1331d2ddc776SDavid Howells } 1332d2ddc776SDavid Howells 1333d2ddc776SDavid Howells ret = -ERESTARTSYS; 1334d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1335d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 133668251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 133730062bd1SDavid Howells 133830062bd1SDavid Howells if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && 133930062bd1SDavid Howells !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { 134030062bd1SDavid Howells yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, 134130062bd1SDavid Howells data_version); 134230062bd1SDavid Howells if (fc.ac.error != -ECONNABORTED || 134330062bd1SDavid Howells fc.ac.abort_code != RXGEN_OPCODE) 134430062bd1SDavid Howells continue; 134530062bd1SDavid Howells set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); 134630062bd1SDavid Howells } 134730062bd1SDavid Howells 134830062bd1SDavid Howells afs_fs_remove(&fc, vnode, dentry->d_name.name, false, 134963a4681fSDavid Howells data_version); 1350d2ddc776SDavid Howells } 1351d2ddc776SDavid Howells 1352d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1353d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1354d2ddc776SDavid Howells if (ret == 0) 1355440fbc3aSDavid Howells ret = afs_dir_remove_link( 1356440fbc3aSDavid Howells dentry, key, d_version, 1357440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 135863a4681fSDavid Howells if (ret == 0 && 135963a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 136063a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 136163a4681fSDavid Howells afs_edit_dir_for_unlink); 1362d2ddc776SDavid Howells } 1363d2ddc776SDavid Howells 1364d2ddc776SDavid Howells error_key: 1365260a9803SDavid Howells key_put(key); 1366260a9803SDavid Howells error: 1367260a9803SDavid Howells _leave(" = %d", ret); 1368260a9803SDavid Howells return ret; 1369260a9803SDavid Howells } 1370260a9803SDavid Howells 1371260a9803SDavid Howells /* 1372260a9803SDavid Howells * create a regular file on an AFS filesystem 1373260a9803SDavid Howells */ 13744acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1375ebfc3b49SAl Viro bool excl) 1376260a9803SDavid Howells { 1377d2ddc776SDavid Howells struct afs_fs_cursor fc; 1378d2ddc776SDavid Howells struct afs_file_status newstatus; 1379d2ddc776SDavid Howells struct afs_callback newcb; 138043dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1381d2ddc776SDavid Howells struct afs_fid newfid; 1382260a9803SDavid Howells struct key *key; 138363a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1384260a9803SDavid Howells int ret; 1385260a9803SDavid Howells 1386d2ddc776SDavid Howells mode |= S_IFREG; 1387260a9803SDavid Howells 13883b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho,", 1389a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1390260a9803SDavid Howells 1391d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1392d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1393d2ddc776SDavid Howells goto error; 1394d2ddc776SDavid Howells 1395260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1396260a9803SDavid Howells if (IS_ERR(key)) { 1397260a9803SDavid Howells ret = PTR_ERR(key); 1398260a9803SDavid Howells goto error; 1399260a9803SDavid Howells } 1400260a9803SDavid Howells 1401d2ddc776SDavid Howells ret = -ERESTARTSYS; 1402d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1403d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 140468251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 140563a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1406d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1407d2ddc776SDavid Howells } 1408d2ddc776SDavid Howells 1409d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1410d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1411d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1412d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1413260a9803SDavid Howells if (ret < 0) 1414d2ddc776SDavid Howells goto error_key; 14154433b691SDavid Howells } else { 14164433b691SDavid Howells goto error_key; 1417260a9803SDavid Howells } 1418260a9803SDavid Howells 141963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 142063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 142163a4681fSDavid Howells afs_edit_dir_for_create); 142263a4681fSDavid Howells 1423260a9803SDavid Howells key_put(key); 1424260a9803SDavid Howells _leave(" = 0"); 1425260a9803SDavid Howells return 0; 1426260a9803SDavid Howells 1427d2ddc776SDavid Howells error_key: 1428260a9803SDavid Howells key_put(key); 1429260a9803SDavid Howells error: 1430260a9803SDavid Howells d_drop(dentry); 1431260a9803SDavid Howells _leave(" = %d", ret); 1432260a9803SDavid Howells return ret; 1433260a9803SDavid Howells } 1434260a9803SDavid Howells 1435260a9803SDavid Howells /* 1436260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1437260a9803SDavid Howells */ 1438260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1439260a9803SDavid Howells struct dentry *dentry) 1440260a9803SDavid Howells { 1441d2ddc776SDavid Howells struct afs_fs_cursor fc; 1442260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1443260a9803SDavid Howells struct key *key; 144463a4681fSDavid Howells u64 data_version; 1445260a9803SDavid Howells int ret; 1446260a9803SDavid Howells 14472b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1448260a9803SDavid Howells dvnode = AFS_FS_I(dir); 144963a4681fSDavid Howells data_version = dvnode->status.data_version; 1450260a9803SDavid Howells 14513b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1452260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1453260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1454a455589fSAl Viro dentry); 1455260a9803SDavid Howells 1456d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1457d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1458d2ddc776SDavid Howells goto error; 1459d2ddc776SDavid Howells 1460260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1461260a9803SDavid Howells if (IS_ERR(key)) { 1462260a9803SDavid Howells ret = PTR_ERR(key); 1463260a9803SDavid Howells goto error; 1464260a9803SDavid Howells } 1465260a9803SDavid Howells 1466d2ddc776SDavid Howells ret = -ERESTARTSYS; 1467d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1468d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1469d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1470bc1527dcSDavid Howells goto error_key; 1471d2ddc776SDavid Howells } 1472260a9803SDavid Howells 1473d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 147468251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 147568251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 147663a4681fSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); 1477d2ddc776SDavid Howells } 1478d2ddc776SDavid Howells 1479d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1480d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 14817de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1482260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1483d2ddc776SDavid Howells 1484d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1485d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1486d2ddc776SDavid Howells if (ret < 0) 1487d2ddc776SDavid Howells goto error_key; 14884433b691SDavid Howells } else { 14894433b691SDavid Howells goto error_key; 1490d2ddc776SDavid Howells } 1491d2ddc776SDavid Howells 149263a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 149363a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 149463a4681fSDavid Howells afs_edit_dir_for_link); 149563a4681fSDavid Howells 1496260a9803SDavid Howells key_put(key); 1497260a9803SDavid Howells _leave(" = 0"); 1498260a9803SDavid Howells return 0; 1499260a9803SDavid Howells 1500d2ddc776SDavid Howells error_key: 1501260a9803SDavid Howells key_put(key); 1502260a9803SDavid Howells error: 1503260a9803SDavid Howells d_drop(dentry); 1504260a9803SDavid Howells _leave(" = %d", ret); 1505260a9803SDavid Howells return ret; 1506260a9803SDavid Howells } 1507260a9803SDavid Howells 1508260a9803SDavid Howells /* 1509260a9803SDavid Howells * create a symlink in an AFS filesystem 1510260a9803SDavid Howells */ 1511260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1512260a9803SDavid Howells const char *content) 1513260a9803SDavid Howells { 1514d2ddc776SDavid Howells struct afs_fs_cursor fc; 1515d2ddc776SDavid Howells struct afs_file_status newstatus; 1516d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1517d2ddc776SDavid Howells struct afs_fid newfid; 1518260a9803SDavid Howells struct key *key; 151963a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1520260a9803SDavid Howells int ret; 1521260a9803SDavid Howells 15223b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1523a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1524260a9803SDavid Howells content); 1525260a9803SDavid Howells 1526d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1527d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1528d2ddc776SDavid Howells goto error; 1529d2ddc776SDavid Howells 1530260a9803SDavid Howells ret = -EINVAL; 153145222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1532260a9803SDavid Howells goto error; 1533260a9803SDavid Howells 1534260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1535260a9803SDavid Howells if (IS_ERR(key)) { 1536260a9803SDavid Howells ret = PTR_ERR(key); 1537260a9803SDavid Howells goto error; 1538260a9803SDavid Howells } 1539260a9803SDavid Howells 1540d2ddc776SDavid Howells ret = -ERESTARTSYS; 1541d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1542d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 154368251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 154463a4681fSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, 154563a4681fSDavid Howells content, data_version, 1546d2ddc776SDavid Howells &newfid, &newstatus); 1547d2ddc776SDavid Howells } 1548d2ddc776SDavid Howells 1549d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1550d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1551d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1552d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1553260a9803SDavid Howells if (ret < 0) 1554d2ddc776SDavid Howells goto error_key; 15554433b691SDavid Howells } else { 15564433b691SDavid Howells goto error_key; 1557260a9803SDavid Howells } 1558260a9803SDavid Howells 155963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 156063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 156163a4681fSDavid Howells afs_edit_dir_for_symlink); 156263a4681fSDavid Howells 1563260a9803SDavid Howells key_put(key); 1564260a9803SDavid Howells _leave(" = 0"); 1565260a9803SDavid Howells return 0; 1566260a9803SDavid Howells 1567d2ddc776SDavid Howells error_key: 1568260a9803SDavid Howells key_put(key); 1569260a9803SDavid Howells error: 1570260a9803SDavid Howells d_drop(dentry); 1571260a9803SDavid Howells _leave(" = %d", ret); 1572260a9803SDavid Howells return ret; 1573260a9803SDavid Howells } 1574260a9803SDavid Howells 1575260a9803SDavid Howells /* 1576260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1577260a9803SDavid Howells */ 1578260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 15791cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 15801cd66c93SMiklos Szeredi unsigned int flags) 1581260a9803SDavid Howells { 1582d2ddc776SDavid Howells struct afs_fs_cursor fc; 1583260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1584260a9803SDavid Howells struct key *key; 158563a4681fSDavid Howells u64 orig_data_version, new_data_version; 158663a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1587260a9803SDavid Howells int ret; 1588260a9803SDavid Howells 15891cd66c93SMiklos Szeredi if (flags) 15901cd66c93SMiklos Szeredi return -EINVAL; 15911cd66c93SMiklos Szeredi 15922b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1593260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1594260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 159563a4681fSDavid Howells orig_data_version = orig_dvnode->status.data_version; 159663a4681fSDavid Howells new_data_version = new_dvnode->status.data_version; 1597260a9803SDavid Howells 15983b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1599260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1600260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1601260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1602a455589fSAl Viro new_dentry); 1603260a9803SDavid Howells 1604260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1605260a9803SDavid Howells if (IS_ERR(key)) { 1606260a9803SDavid Howells ret = PTR_ERR(key); 1607260a9803SDavid Howells goto error; 1608260a9803SDavid Howells } 1609260a9803SDavid Howells 1610d2ddc776SDavid Howells ret = -ERESTARTSYS; 1611d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1612d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1613d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1614d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1615bc1527dcSDavid Howells goto error_key; 1616d2ddc776SDavid Howells } 1617d2ddc776SDavid Howells } 1618d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 161968251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 162068251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1621d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 162263a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 162363a4681fSDavid Howells orig_data_version, new_data_version); 1624d2ddc776SDavid Howells } 1625d2ddc776SDavid Howells 1626d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1627d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1628d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1629d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1630d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1631260a9803SDavid Howells if (ret < 0) 1632d2ddc776SDavid Howells goto error_key; 1633d2ddc776SDavid Howells } 1634d2ddc776SDavid Howells 163563a4681fSDavid Howells if (ret == 0) { 163663a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 163763a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 163863a4681fSDavid Howells afs_edit_dir_for_rename); 163963a4681fSDavid Howells 164063a4681fSDavid Howells if (!new_negative && 164163a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 164263a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 164363a4681fSDavid Howells afs_edit_dir_for_rename); 164463a4681fSDavid Howells 164563a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 164663a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 164763a4681fSDavid Howells &vnode->fid, afs_edit_dir_for_rename); 164863a4681fSDavid Howells } 164963a4681fSDavid Howells 1650d2ddc776SDavid Howells error_key: 1651260a9803SDavid Howells key_put(key); 1652260a9803SDavid Howells error: 1653260a9803SDavid Howells _leave(" = %d", ret); 1654260a9803SDavid Howells return ret; 1655260a9803SDavid Howells } 1656f3ddee8dSDavid Howells 1657f3ddee8dSDavid Howells /* 1658f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1659f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1660f3ddee8dSDavid Howells */ 1661f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1662f3ddee8dSDavid Howells { 1663f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1664f3ddee8dSDavid Howells 16653b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1666f3ddee8dSDavid Howells 1667f3ddee8dSDavid Howells set_page_private(page, 0); 1668f3ddee8dSDavid Howells ClearPagePrivate(page); 1669f3ddee8dSDavid Howells 1670f3ddee8dSDavid Howells /* The directory will need reloading. */ 1671f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1672f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1673f3ddee8dSDavid Howells return 1; 1674f3ddee8dSDavid Howells } 1675f3ddee8dSDavid Howells 1676f3ddee8dSDavid Howells /* 1677f3ddee8dSDavid Howells * invalidate part or all of a page 1678f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1679f3ddee8dSDavid Howells * the entire page) 1680f3ddee8dSDavid Howells */ 1681f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1682f3ddee8dSDavid Howells unsigned int length) 1683f3ddee8dSDavid Howells { 1684f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1685f3ddee8dSDavid Howells 1686f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1687f3ddee8dSDavid Howells 1688f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1689f3ddee8dSDavid Howells 1690f3ddee8dSDavid Howells /* The directory will need reloading. */ 1691f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1692f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1693f3ddee8dSDavid Howells 1694f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1695f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1696f3ddee8dSDavid Howells set_page_private(page, 0); 1697f3ddee8dSDavid Howells ClearPagePrivate(page); 1698f3ddee8dSDavid Howells } 1699f3ddee8dSDavid Howells } 1700