12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 31da177e4SLinus Torvalds * 4f3ddee8dSDavid Howells * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. 51da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #include <linux/kernel.h> 91da177e4SLinus Torvalds #include <linux/fs.h> 1034286d66SNick Piggin #include <linux/namei.h> 111da177e4SLinus Torvalds #include <linux/pagemap.h> 12f3ddee8dSDavid Howells #include <linux/swap.h> 1300d3b7a4SDavid Howells #include <linux/ctype.h> 14e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 15f3ddee8dSDavid Howells #include <linux/task_io_accounting_ops.h> 161da177e4SLinus Torvalds #include "internal.h" 17a58823acSDavid Howells #include "afs_fs.h" 184ea219a8SDavid Howells #include "xdr_fs.h" 191da177e4SLinus Torvalds 20260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2100cd8dd3SAl Viro unsigned int flags); 221da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 231bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 240b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 25fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 2679ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode); 275cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 285cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 29ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 30afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 314acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 32ebfc3b49SAl Viro bool excl); 3318bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 34260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 37260a9803SDavid Howells struct dentry *dentry); 38260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 39260a9803SDavid Howells const char *content); 40260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 411cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 421cd66c93SMiklos Szeredi unsigned int flags); 43f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 44f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 45f3ddee8dSDavid Howells unsigned int length); 46f3ddee8dSDavid Howells 47f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 48f3ddee8dSDavid Howells { 49f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 50f3ddee8dSDavid Howells } 511da177e4SLinus Torvalds 524b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 531da177e4SLinus Torvalds .open = afs_dir_open, 5400d3b7a4SDavid Howells .release = afs_release, 5529884effSAl Viro .iterate_shared = afs_readdir, 56e8d6c554SDavid Howells .lock = afs_lock, 573222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 581da177e4SLinus Torvalds }; 591da177e4SLinus Torvalds 60754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 61260a9803SDavid Howells .create = afs_create, 62260a9803SDavid Howells .lookup = afs_lookup, 63260a9803SDavid Howells .link = afs_link, 64260a9803SDavid Howells .unlink = afs_unlink, 65260a9803SDavid Howells .symlink = afs_symlink, 66260a9803SDavid Howells .mkdir = afs_mkdir, 67260a9803SDavid Howells .rmdir = afs_rmdir, 682773bf00SMiklos Szeredi .rename = afs_rename, 6900d3b7a4SDavid Howells .permission = afs_permission, 70416351f2SDavid Howells .getattr = afs_getattr, 7131143d5dSDavid Howells .setattr = afs_setattr, 72d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 731da177e4SLinus Torvalds }; 741da177e4SLinus Torvalds 75f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 76f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 77f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 78f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 79f3ddee8dSDavid Howells }; 80f3ddee8dSDavid Howells 81d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 821da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 831da177e4SLinus Torvalds .d_delete = afs_d_delete, 84260a9803SDavid Howells .d_release = afs_d_release, 85d18610b0SDavid Howells .d_automount = afs_d_automount, 8679ddbfa5SDavid Howells .d_iput = afs_d_iput, 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 895cf9dd55SDavid Howells struct afs_lookup_one_cookie { 905cf9dd55SDavid Howells struct dir_context ctx; 915cf9dd55SDavid Howells struct qstr name; 925cf9dd55SDavid Howells bool found; 935cf9dd55SDavid Howells struct afs_fid fid; 945cf9dd55SDavid Howells }; 955cf9dd55SDavid Howells 96260a9803SDavid Howells struct afs_lookup_cookie { 971bbae9f8SAl Viro struct dir_context ctx; 981bbae9f8SAl Viro struct qstr name; 995cf9dd55SDavid Howells bool found; 1005cf9dd55SDavid Howells bool one_only; 1015cf9dd55SDavid Howells unsigned short nr_fids; 1025cf9dd55SDavid Howells struct afs_fid fids[50]; 1031da177e4SLinus Torvalds }; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds /* 1061da177e4SLinus Torvalds * check that a directory page is valid 1071da177e4SLinus Torvalds */ 108f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 109f3ddee8dSDavid Howells loff_t i_size) 1101da177e4SLinus Torvalds { 11100317636SDavid Howells struct afs_xdr_dir_page *dbuf; 112f3ddee8dSDavid Howells loff_t latter, off; 1131da177e4SLinus Torvalds int tmp, qty; 1141da177e4SLinus Torvalds 115dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 116dab17c1aSDavid Howells * we must take care because the directory may change size under us. 117dab17c1aSDavid Howells */ 118dab17c1aSDavid Howells off = page_offset(page); 119dab17c1aSDavid Howells if (i_size <= off) 120dab17c1aSDavid Howells goto checked; 121dab17c1aSDavid Howells 122dab17c1aSDavid Howells latter = i_size - off; 1231da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1241da177e4SLinus Torvalds qty = PAGE_SIZE; 1251da177e4SLinus Torvalds else 1261da177e4SLinus Torvalds qty = latter; 12700317636SDavid Howells qty /= sizeof(union afs_xdr_dir_block); 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds /* check them */ 13063a4681fSDavid Howells dbuf = kmap(page); 1311da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 13200317636SDavid Howells if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 133dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 134f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 13500317636SDavid Howells ntohs(dbuf->blocks[tmp].hdr.magic)); 136f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 13763a4681fSDavid Howells kunmap(page); 138f51375cdSDavid Howells trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 1391da177e4SLinus Torvalds goto error; 1401da177e4SLinus Torvalds } 14163a4681fSDavid Howells 14263a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 14363a4681fSDavid Howells * use string functions on it. The filenames in the page 14463a4681fSDavid Howells * *should* be NUL-terminated anyway. 14563a4681fSDavid Howells */ 14663a4681fSDavid Howells ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 14963a4681fSDavid Howells kunmap(page); 15063a4681fSDavid Howells 151dab17c1aSDavid Howells checked: 152f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 153be5b82dbSAl Viro return true; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds error: 156be5b82dbSAl Viro return false; 157ec26815aSDavid Howells } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds /* 160445b1028SDavid Howells * Check the contents of a directory that we've just read. 161445b1028SDavid Howells */ 162445b1028SDavid Howells static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req) 163445b1028SDavid Howells { 164445b1028SDavid Howells struct afs_xdr_dir_page *dbuf; 165445b1028SDavid Howells unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); 166445b1028SDavid Howells 167445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) 168445b1028SDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len)) 169445b1028SDavid Howells goto bad; 170445b1028SDavid Howells return true; 171445b1028SDavid Howells 172445b1028SDavid Howells bad: 173445b1028SDavid Howells pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n", 174445b1028SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 175445b1028SDavid Howells req->file_size, req->len, req->actual_len, req->remain); 176445b1028SDavid Howells pr_warn("DIR %llx %x %x %x\n", 177445b1028SDavid Howells req->pos, req->index, req->nr_pages, req->offset); 178445b1028SDavid Howells 179445b1028SDavid Howells for (i = 0; i < req->nr_pages; i++) { 180445b1028SDavid Howells dbuf = kmap(req->pages[i]); 181445b1028SDavid Howells for (j = 0; j < qty; j++) { 182445b1028SDavid Howells union afs_xdr_dir_block *block = &dbuf->blocks[j]; 183445b1028SDavid Howells 184445b1028SDavid Howells pr_warn("[%02x] %32phN\n", i * qty + j, block); 185445b1028SDavid Howells } 186445b1028SDavid Howells kunmap(req->pages[i]); 187445b1028SDavid Howells } 188445b1028SDavid Howells return false; 189445b1028SDavid Howells } 190445b1028SDavid Howells 191445b1028SDavid Howells /* 1921da177e4SLinus Torvalds * open an AFS directory file 1931da177e4SLinus Torvalds */ 1941da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 1951da177e4SLinus Torvalds { 1961da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 1971da177e4SLinus Torvalds 19800317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 19900317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 2001da177e4SLinus Torvalds 20108e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2021da177e4SLinus Torvalds return -ENOENT; 2031da177e4SLinus Torvalds 20400d3b7a4SDavid Howells return afs_open(inode, file); 205ec26815aSDavid Howells } 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds /* 208f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 209f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 210f3ddee8dSDavid Howells * get reclaimed during the iteration. 211f3ddee8dSDavid Howells */ 212f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 213b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 214f3ddee8dSDavid Howells { 215f3ddee8dSDavid Howells struct afs_read *req; 216f3ddee8dSDavid Howells loff_t i_size; 217f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 218f3ddee8dSDavid Howells int ret = -ENOMEM; 219f3ddee8dSDavid Howells 220f3ddee8dSDavid Howells retry: 221f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 222f3ddee8dSDavid Howells if (i_size < 2048) 223f51375cdSDavid Howells return ERR_PTR(afs_bad(dvnode, afs_file_error_dir_small)); 224f51375cdSDavid Howells if (i_size > 2048 * 1024) { 225f51375cdSDavid Howells trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 226f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 227f51375cdSDavid Howells } 228f3ddee8dSDavid Howells 229f3ddee8dSDavid Howells _enter("%llu", i_size); 230f3ddee8dSDavid Howells 231f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 232f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 233f3ddee8dSDavid Howells */ 234f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 235f3ddee8dSDavid Howells nr_inline = nr_pages; 236f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 237f3ddee8dSDavid Howells nr_inline = 0; 238f3ddee8dSDavid Howells 239ee102584SZhengyuan Liu req = kzalloc(struct_size(req, array, nr_inline), GFP_KERNEL); 240f3ddee8dSDavid Howells if (!req) 241f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 242f3ddee8dSDavid Howells 243f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 244f3ddee8dSDavid Howells req->nr_pages = nr_pages; 245f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 246f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 247f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 248f3ddee8dSDavid Howells if (nr_inline > 0) { 249f3ddee8dSDavid Howells req->pages = req->array; 250f3ddee8dSDavid Howells } else { 251f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 252f3ddee8dSDavid Howells GFP_KERNEL); 253f3ddee8dSDavid Howells if (!req->pages) 254f3ddee8dSDavid Howells goto error; 255f3ddee8dSDavid Howells } 256f3ddee8dSDavid Howells 257f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 258f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 259f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 260f3ddee8dSDavid Howells * need to reread the entire directory contents. 261f3ddee8dSDavid Howells */ 262f3ddee8dSDavid Howells i = 0; 263f3ddee8dSDavid Howells do { 264f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 265f3ddee8dSDavid Howells req->nr_pages - i, 266f3ddee8dSDavid Howells req->pages + i); 267f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 268f3ddee8dSDavid Howells if (n == 0) { 269f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 270f3ddee8dSDavid Howells 271f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 272f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 273f3ddee8dSDavid Howells 274f3ddee8dSDavid Howells ret = -ENOMEM; 275f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 276f3ddee8dSDavid Howells if (!req->pages[i]) 277f3ddee8dSDavid Howells goto error; 278f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 279f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 280f3ddee8dSDavid Howells i, gfp); 281f3ddee8dSDavid Howells if (ret < 0) 282f3ddee8dSDavid Howells goto error; 283f3ddee8dSDavid Howells 284fa04a40bSDavid Howells attach_page_private(req->pages[i], (void *)1); 285f3ddee8dSDavid Howells unlock_page(req->pages[i]); 286f3ddee8dSDavid Howells i++; 287f3ddee8dSDavid Howells } else { 288f3ddee8dSDavid Howells i += n; 289f3ddee8dSDavid Howells } 290f3ddee8dSDavid Howells } while (i < req->nr_pages); 291f3ddee8dSDavid Howells 292f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 293f3ddee8dSDavid Howells * races. 294f3ddee8dSDavid Howells */ 295f3ddee8dSDavid Howells ret = -ERESTARTSYS; 296b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 297b61f7dcfSDavid Howells goto error; 298f3ddee8dSDavid Howells 299f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 300f3ddee8dSDavid Howells goto success; 301f3ddee8dSDavid Howells 302b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 303b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 304b61f7dcfSDavid Howells goto error; 305b61f7dcfSDavid Howells 306b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 30799987c56SDavid Howells trace_afs_reload_dir(dvnode); 308f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 309f3ddee8dSDavid Howells if (ret < 0) 310b61f7dcfSDavid Howells goto error_unlock; 311f3ddee8dSDavid Howells 312f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 313f3ddee8dSDavid Howells 314f3ddee8dSDavid Howells if (req->len < req->file_size) 315f3ddee8dSDavid Howells goto content_has_grown; 316f3ddee8dSDavid Howells 317f3ddee8dSDavid Howells /* Validate the data we just read. */ 318f3ddee8dSDavid Howells ret = -EIO; 319445b1028SDavid Howells if (!afs_dir_check_pages(dvnode, req)) 320b61f7dcfSDavid Howells goto error_unlock; 321f3ddee8dSDavid Howells 322f3ddee8dSDavid Howells // TODO: Trim excess pages 323f3ddee8dSDavid Howells 324f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 325f3ddee8dSDavid Howells } 326f3ddee8dSDavid Howells 327b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 328f3ddee8dSDavid Howells success: 329f3ddee8dSDavid Howells return req; 330f3ddee8dSDavid Howells 331f3ddee8dSDavid Howells error_unlock: 332b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 333f3ddee8dSDavid Howells error: 334f3ddee8dSDavid Howells afs_put_read(req); 335f3ddee8dSDavid Howells _leave(" = %d", ret); 336f3ddee8dSDavid Howells return ERR_PTR(ret); 337f3ddee8dSDavid Howells 338f3ddee8dSDavid Howells content_has_grown: 339b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 340f3ddee8dSDavid Howells afs_put_read(req); 341f3ddee8dSDavid Howells goto retry; 342f3ddee8dSDavid Howells } 343f3ddee8dSDavid Howells 344f3ddee8dSDavid Howells /* 3451da177e4SLinus Torvalds * deal with one block in an AFS directory 3461da177e4SLinus Torvalds */ 347f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 348f51375cdSDavid Howells struct dir_context *ctx, 34900317636SDavid Howells union afs_xdr_dir_block *block, 3501bbae9f8SAl Viro unsigned blkoff) 3511da177e4SLinus Torvalds { 35200317636SDavid Howells union afs_xdr_dirent *dire; 353*366911cdSDavid Howells unsigned offset, next, curr, nr_slots; 3541da177e4SLinus Torvalds size_t nlen; 3551bbae9f8SAl Viro int tmp; 3561da177e4SLinus Torvalds 3571bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3581da177e4SLinus Torvalds 35900317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3624ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3634ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3641da177e4SLinus Torvalds offset = next 3651da177e4SLinus Torvalds ) { 3661da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 36700317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3681da177e4SLinus Torvalds (1 << (offset % 8)))) { 3695b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 37000317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 371*366911cdSDavid Howells next = offset + 1; 3721da177e4SLinus Torvalds if (offset >= curr) 3731bbae9f8SAl Viro ctx->pos = blkoff + 37400317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3751da177e4SLinus Torvalds continue; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* got a valid entry */ 3791da177e4SLinus Torvalds dire = &block->dirents[offset]; 3801da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3811da177e4SLinus Torvalds sizeof(*block) - 38200317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 383*366911cdSDavid Howells if (nlen > AFSNAMEMAX - 1) { 384*366911cdSDavid Howells _debug("ENT[%zu]: name too long (len %u/%zu)", 385*366911cdSDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 386*366911cdSDavid Howells offset, nlen); 387*366911cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_name_too_long); 388*366911cdSDavid Howells } 3891da177e4SLinus Torvalds 3905b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 39100317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3921da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3931da177e4SLinus Torvalds nlen, dire->u.name); 3941da177e4SLinus Torvalds 395*366911cdSDavid Howells nr_slots = afs_dir_calc_slots(nlen); 396*366911cdSDavid Howells next = offset + nr_slots; 397*366911cdSDavid Howells if (next > AFS_DIR_SLOTS_PER_BLOCK) { 3985b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 399*366911cdSDavid Howells " %u extends beyond end dir block" 400*366911cdSDavid Howells " (len %zu)", 40100317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 402*366911cdSDavid Howells offset, next, nlen); 403f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4041da177e4SLinus Torvalds } 405*366911cdSDavid Howells 406*366911cdSDavid Howells /* Check that the name-extension dirents are all allocated */ 407*366911cdSDavid Howells for (tmp = 1; tmp < nr_slots; tmp++) { 408*366911cdSDavid Howells unsigned int ix = offset + tmp; 409*366911cdSDavid Howells if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) { 410*366911cdSDavid Howells _debug("ENT[%zu.u]:" 411*366911cdSDavid Howells " %u unmarked extension (%u/%u)", 41200317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 413*366911cdSDavid Howells offset, tmp, nr_slots); 414f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* skip if starts before the current position */ 4191da177e4SLinus Torvalds if (offset < curr) 4201da177e4SLinus Torvalds continue; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* found the next entry */ 4231bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4241da177e4SLinus Torvalds ntohl(dire->u.vnode), 4255cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4265cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4271bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4281da177e4SLinus Torvalds _leave(" = 0 [full]"); 4291da177e4SLinus Torvalds return 0; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 43200317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds _leave(" = 1 [more]"); 4361da177e4SLinus Torvalds return 1; 437ec26815aSDavid Howells } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* 44008e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4411da177e4SLinus Torvalds */ 4421bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4439dd0b82eSDavid Howells struct key *key, afs_dataversion_t *_dir_version) 4441da177e4SLinus Torvalds { 445f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 44600317636SDavid Howells struct afs_xdr_dir_page *dbuf; 44700317636SDavid Howells union afs_xdr_dir_block *dblock; 448f3ddee8dSDavid Howells struct afs_read *req; 4491da177e4SLinus Torvalds struct page *page; 4501da177e4SLinus Torvalds unsigned blkoff, limit; 4511da177e4SLinus Torvalds int ret; 4521da177e4SLinus Torvalds 4531bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4541da177e4SLinus Torvalds 45508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4561da177e4SLinus Torvalds _leave(" = -ESTALE"); 4571da177e4SLinus Torvalds return -ESTALE; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 460f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 461f3ddee8dSDavid Howells if (IS_ERR(req)) 462f3ddee8dSDavid Howells return PTR_ERR(req); 4639dd0b82eSDavid Howells *_dir_version = req->data_version; 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 { 5189dd0b82eSDavid Howells afs_dataversion_t dir_version; 5199dd0b82eSDavid Howells 5209dd0b82eSDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 5219dd0b82eSDavid Howells &dir_version); 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, 5629dd0b82eSDavid Howells struct afs_fid *fid, struct key *key, 5639dd0b82eSDavid Howells afs_dataversion_t *_dir_version) 5641da177e4SLinus Torvalds { 5651bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5665cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5675cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5681bbae9f8SAl Viro .name = dentry->d_name, 5691bbae9f8SAl Viro .fid.vid = as->volume->vid 5701bbae9f8SAl Viro }; 5711da177e4SLinus Torvalds int ret; 5721da177e4SLinus Torvalds 573a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds /* search the directory */ 5769dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 5771da177e4SLinus Torvalds if (ret < 0) { 57808e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 57908e0e7c8SDavid Howells return ret; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds ret = -ENOENT; 5831da177e4SLinus Torvalds if (!cookie.found) { 58408e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58508e0e7c8SDavid Howells return -ENOENT; 58608e0e7c8SDavid Howells } 58708e0e7c8SDavid Howells 58808e0e7c8SDavid Howells *fid = cookie.fid; 5893b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 59008e0e7c8SDavid Howells return 0; 59108e0e7c8SDavid Howells } 59208e0e7c8SDavid Howells 59308e0e7c8SDavid Howells /* 5945cf9dd55SDavid Howells * search the directory for a name 5955cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5965cf9dd55SDavid Howells * uniquifier through dtype 5975cf9dd55SDavid Howells */ 5985cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5995cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 6005cf9dd55SDavid Howells { 6015cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6025cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6035cf9dd55SDavid Howells int ret; 6045cf9dd55SDavid Howells 6055cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6065cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6075cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6085cf9dd55SDavid Howells 6095cf9dd55SDavid Howells /* insanity checks first */ 61000317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 61100317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6125cf9dd55SDavid Howells 6135cf9dd55SDavid Howells if (cookie->found) { 6145cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6155cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6165cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6175cf9dd55SDavid Howells cookie->nr_fids++; 6185cf9dd55SDavid Howells } 6195cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6205cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 621e49c7b2fSDavid Howells cookie->fids[1].vnode = ino; 622e49c7b2fSDavid Howells cookie->fids[1].unique = dtype; 6235cf9dd55SDavid Howells cookie->found = 1; 6245cf9dd55SDavid Howells if (cookie->one_only) 6255cf9dd55SDavid Howells return -1; 6265cf9dd55SDavid Howells } 6275cf9dd55SDavid Howells 6285cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6295cf9dd55SDavid Howells _leave(" = %d", ret); 6305cf9dd55SDavid Howells return ret; 6315cf9dd55SDavid Howells } 6325cf9dd55SDavid Howells 6335cf9dd55SDavid Howells /* 634e49c7b2fSDavid Howells * Deal with the result of a successful lookup operation. Turn all the files 635e49c7b2fSDavid Howells * into inodes and save the first one - which is the one we actually want. 636e49c7b2fSDavid Howells */ 637e49c7b2fSDavid Howells static void afs_do_lookup_success(struct afs_operation *op) 638e49c7b2fSDavid Howells { 639e49c7b2fSDavid Howells struct afs_vnode_param *vp; 640e49c7b2fSDavid Howells struct afs_vnode *vnode; 641e49c7b2fSDavid Howells struct inode *inode; 642e49c7b2fSDavid Howells u32 abort_code; 643e49c7b2fSDavid Howells int i; 644e49c7b2fSDavid Howells 645e49c7b2fSDavid Howells _enter(""); 646e49c7b2fSDavid Howells 647e49c7b2fSDavid Howells for (i = 0; i < op->nr_files; i++) { 648e49c7b2fSDavid Howells switch (i) { 649e49c7b2fSDavid Howells case 0: 650e49c7b2fSDavid Howells vp = &op->file[0]; 651e49c7b2fSDavid Howells abort_code = vp->scb.status.abort_code; 652e49c7b2fSDavid Howells if (abort_code != 0) { 65344767c35SDavid Howells op->ac.abort_code = abort_code; 654e49c7b2fSDavid Howells op->error = afs_abort_to_error(abort_code); 655e49c7b2fSDavid Howells } 656e49c7b2fSDavid Howells break; 657e49c7b2fSDavid Howells 658e49c7b2fSDavid Howells case 1: 659e49c7b2fSDavid Howells vp = &op->file[1]; 660e49c7b2fSDavid Howells break; 661e49c7b2fSDavid Howells 662e49c7b2fSDavid Howells default: 663e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 664e49c7b2fSDavid Howells break; 665e49c7b2fSDavid Howells } 666e49c7b2fSDavid Howells 667e49c7b2fSDavid Howells if (!vp->scb.have_status && !vp->scb.have_error) 668e49c7b2fSDavid Howells continue; 669e49c7b2fSDavid Howells 670e49c7b2fSDavid Howells _debug("do [%u]", i); 671e49c7b2fSDavid Howells if (vp->vnode) { 672e49c7b2fSDavid Howells if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) 673e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 674e49c7b2fSDavid Howells } else if (vp->scb.status.abort_code == 0) { 675e49c7b2fSDavid Howells inode = afs_iget(op, vp); 676e49c7b2fSDavid Howells if (!IS_ERR(inode)) { 677e49c7b2fSDavid Howells vnode = AFS_FS_I(inode); 678e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, 679e49c7b2fSDavid Howells 0 /* Assume vnode->cb_break is 0 */ + 680e49c7b2fSDavid Howells op->cb_v_break, 681e49c7b2fSDavid Howells &vp->scb); 682e49c7b2fSDavid Howells vp->vnode = vnode; 683e49c7b2fSDavid Howells vp->put_vnode = true; 684e49c7b2fSDavid Howells } 685e49c7b2fSDavid Howells } else { 686e49c7b2fSDavid Howells _debug("- abort %d %llx:%llx.%x", 687e49c7b2fSDavid Howells vp->scb.status.abort_code, 688e49c7b2fSDavid Howells vp->fid.vid, vp->fid.vnode, vp->fid.unique); 689e49c7b2fSDavid Howells } 690e49c7b2fSDavid Howells } 691e49c7b2fSDavid Howells 692e49c7b2fSDavid Howells _leave(""); 693e49c7b2fSDavid Howells } 694e49c7b2fSDavid Howells 695e49c7b2fSDavid Howells static const struct afs_operation_ops afs_inline_bulk_status_operation = { 696e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_inline_bulk_status, 697e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_inline_bulk_status, 698e49c7b2fSDavid Howells .success = afs_do_lookup_success, 699e49c7b2fSDavid Howells }; 700e49c7b2fSDavid Howells 701b6489a49SDavid Howells static const struct afs_operation_ops afs_lookup_fetch_status_operation = { 702e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_fetch_status, 703e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_fetch_status, 704e49c7b2fSDavid Howells .success = afs_do_lookup_success, 705728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 706e49c7b2fSDavid Howells }; 707e49c7b2fSDavid Howells 708e49c7b2fSDavid Howells /* 70920325960SDavid Howells * See if we know that the server we expect to use doesn't support 71020325960SDavid Howells * FS.InlineBulkStatus. 71120325960SDavid Howells */ 71220325960SDavid Howells static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) 71320325960SDavid Howells { 71420325960SDavid Howells struct afs_server_list *slist; 71520325960SDavid Howells struct afs_volume *volume = dvnode->volume; 71620325960SDavid Howells struct afs_server *server; 71720325960SDavid Howells bool ret = true; 71820325960SDavid Howells int i; 71920325960SDavid Howells 72020325960SDavid Howells if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) 72120325960SDavid Howells return true; 72220325960SDavid Howells 72320325960SDavid Howells rcu_read_lock(); 72420325960SDavid Howells slist = rcu_dereference(volume->servers); 72520325960SDavid Howells 72620325960SDavid Howells for (i = 0; i < slist->nr_servers; i++) { 72720325960SDavid Howells server = slist->servers[i].server; 72820325960SDavid Howells if (server == dvnode->cb_server) { 72920325960SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 73020325960SDavid Howells ret = false; 73120325960SDavid Howells break; 73220325960SDavid Howells } 73320325960SDavid Howells } 73420325960SDavid Howells 73520325960SDavid Howells rcu_read_unlock(); 73620325960SDavid Howells return ret; 73720325960SDavid Howells } 73820325960SDavid Howells 73920325960SDavid Howells /* 7405cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 7415cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 7425cf9dd55SDavid Howells * asked for is returned. 7435cf9dd55SDavid Howells */ 7445cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 7455cf9dd55SDavid Howells struct key *key) 7465cf9dd55SDavid Howells { 7475cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 748e49c7b2fSDavid Howells struct afs_vnode_param *vp; 749e49c7b2fSDavid Howells struct afs_operation *op; 75039db9815SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 75139db9815SDavid Howells struct inode *inode = NULL, *ti; 7529dd0b82eSDavid Howells afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 753e49c7b2fSDavid Howells long ret; 754e49c7b2fSDavid Howells int i; 7555cf9dd55SDavid Howells 7565cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 7575cf9dd55SDavid Howells 7585cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 7595cf9dd55SDavid Howells if (!cookie) 7605cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 7615cf9dd55SDavid Howells 762e49c7b2fSDavid Howells for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) 763e49c7b2fSDavid Howells cookie->fids[i].vid = dvnode->fid.vid; 7645cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 7655cf9dd55SDavid Howells cookie->name = dentry->d_name; 76613fcc635SDavid Howells cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want 76713fcc635SDavid Howells * and slot 1 for the directory */ 7685cf9dd55SDavid Howells 76920325960SDavid Howells if (!afs_server_supports_ibulk(dvnode)) 7705cf9dd55SDavid Howells cookie->one_only = true; 7715cf9dd55SDavid Howells 7725cf9dd55SDavid Howells /* search the directory */ 7739dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 774e49c7b2fSDavid Howells if (ret < 0) 7755cf9dd55SDavid Howells goto out; 7765cf9dd55SDavid Howells 7779dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)data_version; 7789dd0b82eSDavid Howells 779e49c7b2fSDavid Howells ret = -ENOENT; 7805cf9dd55SDavid Howells if (!cookie->found) 7815cf9dd55SDavid Howells goto out; 7825cf9dd55SDavid Howells 7835cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 784e49c7b2fSDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, 785e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &cookie->fids[1]); 7865cf9dd55SDavid Howells if (inode) 787e49c7b2fSDavid Howells goto out; /* We do */ 788e49c7b2fSDavid Howells 789e49c7b2fSDavid Howells /* Okay, we didn't find it. We need to query the server - and whilst 790e49c7b2fSDavid Howells * we're doing that, we're going to attempt to look up a bunch of other 791e49c7b2fSDavid Howells * vnodes also. 792e49c7b2fSDavid Howells */ 793e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 794e49c7b2fSDavid Howells if (IS_ERR(op)) { 795e49c7b2fSDavid Howells ret = PTR_ERR(op); 7965cf9dd55SDavid Howells goto out; 797e49c7b2fSDavid Howells } 798e49c7b2fSDavid Howells 799e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 800e49c7b2fSDavid Howells afs_op_set_fid(op, 1, &cookie->fids[1]); 801e49c7b2fSDavid Howells 802e49c7b2fSDavid Howells op->nr_files = cookie->nr_fids; 803e49c7b2fSDavid Howells _debug("nr_files %u", op->nr_files); 8045cf9dd55SDavid Howells 8055cf9dd55SDavid Howells /* Need space for examining all the selected files */ 806e49c7b2fSDavid Howells op->error = -ENOMEM; 807e49c7b2fSDavid Howells if (op->nr_files > 2) { 808e49c7b2fSDavid Howells op->more_files = kvcalloc(op->nr_files - 2, 809e49c7b2fSDavid Howells sizeof(struct afs_vnode_param), 8105cf9dd55SDavid Howells GFP_KERNEL); 811e49c7b2fSDavid Howells if (!op->more_files) 812e49c7b2fSDavid Howells goto out_op; 8135cf9dd55SDavid Howells 814e49c7b2fSDavid Howells for (i = 2; i < op->nr_files; i++) { 815e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 816e49c7b2fSDavid Howells vp->fid = cookie->fids[i]; 81739db9815SDavid Howells 81839db9815SDavid Howells /* Find any inodes that already exist and get their 81939db9815SDavid Howells * callback counters. 82039db9815SDavid Howells */ 821e49c7b2fSDavid Howells ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, 822e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &vp->fid); 82339db9815SDavid Howells if (!IS_ERR_OR_NULL(ti)) { 82439db9815SDavid Howells vnode = AFS_FS_I(ti); 825e49c7b2fSDavid Howells vp->dv_before = vnode->status.data_version; 826e49c7b2fSDavid Howells vp->cb_break_before = afs_calc_vnode_cb_break(vnode); 827e49c7b2fSDavid Howells vp->vnode = vnode; 828e49c7b2fSDavid Howells vp->put_vnode = true; 829a9e5c87cSDavid Howells vp->speculative = true; /* vnode not locked */ 830e49c7b2fSDavid Howells } 83139db9815SDavid Howells } 83239db9815SDavid Howells } 83339db9815SDavid Howells 8345cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 8355cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 8365cf9dd55SDavid Howells * the whole operation. 8375cf9dd55SDavid Howells */ 838e49c7b2fSDavid Howells op->error = -ENOTSUPP; 839e49c7b2fSDavid Howells if (!cookie->one_only) { 840e49c7b2fSDavid Howells op->ops = &afs_inline_bulk_status_operation; 841e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 842e49c7b2fSDavid Howells afs_wait_for_operation(op); 8435cf9dd55SDavid Howells } 8445cf9dd55SDavid Howells 845e49c7b2fSDavid Howells if (op->error == -ENOTSUPP) { 846e49c7b2fSDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire 847e49c7b2fSDavid Howells * op if any of the lookups fails - so, for the moment, revert 848e49c7b2fSDavid Howells * to FS.FetchStatus for op->file[1]. 8495cf9dd55SDavid Howells */ 850e49c7b2fSDavid Howells op->fetch_status.which = 1; 851f8ea5c7bSDavid Howells op->ops = &afs_lookup_fetch_status_operation; 852e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 853e49c7b2fSDavid Howells afs_wait_for_operation(op); 854e49c7b2fSDavid Howells } 855e49c7b2fSDavid Howells inode = ERR_PTR(op->error); 856e49c7b2fSDavid Howells 857e49c7b2fSDavid Howells out_op: 858e49c7b2fSDavid Howells if (op->error == 0) { 859e49c7b2fSDavid Howells inode = &op->file[1].vnode->vfs_inode; 860e49c7b2fSDavid Howells op->file[1].vnode = NULL; 8615cf9dd55SDavid Howells } 8625cf9dd55SDavid Howells 863e49c7b2fSDavid Howells if (op->file[0].scb.have_status) 864e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; 865e49c7b2fSDavid Howells else 866e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; 867e49c7b2fSDavid Howells ret = afs_put_operation(op); 8685cf9dd55SDavid Howells out: 8695cf9dd55SDavid Howells kfree(cookie); 870e49c7b2fSDavid Howells _leave(""); 871e49c7b2fSDavid Howells return inode ?: ERR_PTR(ret); 8725cf9dd55SDavid Howells } 8735cf9dd55SDavid Howells 8745cf9dd55SDavid Howells /* 8756f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 8766f8880d8SDavid Howells */ 8776f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 8786f8880d8SDavid Howells struct key *key) 8796f8880d8SDavid Howells { 8806f8880d8SDavid Howells struct afs_sysnames *subs; 8816f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8826f8880d8SDavid Howells struct dentry *ret; 8836f8880d8SDavid Howells char *buf, *p, *name; 8846f8880d8SDavid Howells int len, i; 8856f8880d8SDavid Howells 8866f8880d8SDavid Howells _enter(""); 8876f8880d8SDavid Howells 8886f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8896f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8906f8880d8SDavid Howells if (!buf) 8916f8880d8SDavid Howells goto out_p; 8926f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8936f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8946f8880d8SDavid Howells p += dentry->d_name.len - 4; 8956f8880d8SDavid Howells } 8966f8880d8SDavid Howells 8976f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8986f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8996f8880d8SDavid Howells subs = net->sysnames; 9006f8880d8SDavid Howells refcount_inc(&subs->usage); 9016f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 9026f8880d8SDavid Howells 9036f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 9046f8880d8SDavid Howells name = subs->subs[i]; 9056f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 9066f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 9076f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 9086f8880d8SDavid Howells goto out_s; 9096f8880d8SDavid Howells } 9106f8880d8SDavid Howells 9116f8880d8SDavid Howells strcpy(p, name); 9126f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 9136f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 9146f8880d8SDavid Howells goto out_s; 9156f8880d8SDavid Howells dput(ret); 9166f8880d8SDavid Howells } 9176f8880d8SDavid Howells 9186f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 9196f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 9206f8880d8SDavid Howells */ 9216f8880d8SDavid Howells ret = NULL; 9226f8880d8SDavid Howells out_s: 9236f8880d8SDavid Howells afs_put_sysnames(subs); 9246f8880d8SDavid Howells kfree(buf); 9256f8880d8SDavid Howells out_p: 9266f8880d8SDavid Howells key_put(key); 9276f8880d8SDavid Howells return ret; 9286f8880d8SDavid Howells } 9296f8880d8SDavid Howells 9306f8880d8SDavid Howells /* 93108e0e7c8SDavid Howells * look up an entry in a directory 93208e0e7c8SDavid Howells */ 933260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 93400cd8dd3SAl Viro unsigned int flags) 93508e0e7c8SDavid Howells { 9365cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 93740a708bdSDavid Howells struct afs_fid fid = {}; 93808e0e7c8SDavid Howells struct inode *inode; 93934b2a88fSAl Viro struct dentry *d; 94000d3b7a4SDavid Howells struct key *key; 94108e0e7c8SDavid Howells int ret; 94208e0e7c8SDavid Howells 9433b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 9445cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 945260a9803SDavid Howells 9462b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 94708e0e7c8SDavid Howells 94845222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 94908e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 95008e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 95108e0e7c8SDavid Howells } 95208e0e7c8SDavid Howells 9535cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 95408e0e7c8SDavid Howells _leave(" = -ESTALE"); 95508e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 95608e0e7c8SDavid Howells } 95708e0e7c8SDavid Howells 9585cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 95900d3b7a4SDavid Howells if (IS_ERR(key)) { 96000d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 961e231c2eeSDavid Howells return ERR_CAST(key); 96200d3b7a4SDavid Howells } 96300d3b7a4SDavid Howells 9645cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 96508e0e7c8SDavid Howells if (ret < 0) { 96600d3b7a4SDavid Howells key_put(key); 967260a9803SDavid Howells _leave(" = %d [val]", ret); 9681da177e4SLinus Torvalds return ERR_PTR(ret); 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds 9716f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 9726f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 9736f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 9746f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 9756f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 9766f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 9776f8880d8SDavid Howells 978d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 9795cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 98034b2a88fSAl Viro key_put(key); 981f52b83b0SDavid Howells if (inode == ERR_PTR(-ENOENT)) 9825cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 98340a708bdSDavid Howells 98440a708bdSDavid Howells if (!IS_ERR_OR_NULL(inode)) 98540a708bdSDavid Howells fid = AFS_FS_I(inode)->fid; 98640a708bdSDavid Howells 987fed79fd7SDavid Howells _debug("splice %p", dentry->d_inode); 98834b2a88fSAl Viro d = d_splice_alias(inode, dentry); 98980548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 99034b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 99140a708bdSDavid Howells trace_afs_lookup(dvnode, &d->d_name, &fid); 99280548b03SDavid Howells } else { 99340a708bdSDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, &fid); 99480548b03SDavid Howells } 995e49c7b2fSDavid Howells _leave(""); 99634b2a88fSAl Viro return d; 997ec26815aSDavid Howells } 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds /* 1000a0753c29SDavid Howells * Check the validity of a dentry under RCU conditions. 1001a0753c29SDavid Howells */ 1002a0753c29SDavid Howells static int afs_d_revalidate_rcu(struct dentry *dentry) 1003a0753c29SDavid Howells { 1004a0753c29SDavid Howells struct afs_vnode *dvnode, *vnode; 1005a0753c29SDavid Howells struct dentry *parent; 1006a0753c29SDavid Howells struct inode *dir, *inode; 1007a0753c29SDavid Howells long dir_version, de_version; 1008a0753c29SDavid Howells 1009a0753c29SDavid Howells _enter("%p", dentry); 1010a0753c29SDavid Howells 1011a0753c29SDavid Howells /* Check the parent directory is still valid first. */ 1012a0753c29SDavid Howells parent = READ_ONCE(dentry->d_parent); 1013a0753c29SDavid Howells dir = d_inode_rcu(parent); 1014a0753c29SDavid Howells if (!dir) 1015a0753c29SDavid Howells return -ECHILD; 1016a0753c29SDavid Howells dvnode = AFS_FS_I(dir); 1017a0753c29SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 1018a0753c29SDavid Howells return -ECHILD; 1019a0753c29SDavid Howells 1020a0753c29SDavid Howells if (!afs_check_validity(dvnode)) 1021a0753c29SDavid Howells return -ECHILD; 1022a0753c29SDavid Howells 1023a0753c29SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1024a0753c29SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1025a0753c29SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1026a0753c29SDavid Howells * version. 1027a0753c29SDavid Howells */ 1028a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->status.data_version); 1029a0753c29SDavid Howells de_version = (long)READ_ONCE(dentry->d_fsdata); 1030a0753c29SDavid Howells if (de_version != dir_version) { 1031a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->invalid_before); 1032a0753c29SDavid Howells if (de_version - dir_version < 0) 1033a0753c29SDavid Howells return -ECHILD; 1034a0753c29SDavid Howells } 1035a0753c29SDavid Howells 1036a0753c29SDavid Howells /* Check to see if the vnode referred to by the dentry still 1037a0753c29SDavid Howells * has a callback. 1038a0753c29SDavid Howells */ 1039a0753c29SDavid Howells if (d_really_is_positive(dentry)) { 1040a0753c29SDavid Howells inode = d_inode_rcu(dentry); 1041a0753c29SDavid Howells if (inode) { 1042a0753c29SDavid Howells vnode = AFS_FS_I(inode); 1043a0753c29SDavid Howells if (!afs_check_validity(vnode)) 1044a0753c29SDavid Howells return -ECHILD; 1045a0753c29SDavid Howells } 1046a0753c29SDavid Howells } 1047a0753c29SDavid Howells 1048a0753c29SDavid Howells return 1; /* Still valid */ 1049a0753c29SDavid Howells } 1050a0753c29SDavid Howells 1051a0753c29SDavid Howells /* 10521da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 10531da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 10541da177e4SLinus Torvalds * inode 10551da177e4SLinus Torvalds */ 10560b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 10571da177e4SLinus Torvalds { 1058260a9803SDavid Howells struct afs_vnode *vnode, *dir; 10593f649ab7SKees Cook struct afs_fid fid; 10601da177e4SLinus Torvalds struct dentry *parent; 1061c435ee34SDavid Howells struct inode *inode; 106200d3b7a4SDavid Howells struct key *key; 106340fc8102SDavid Howells afs_dataversion_t dir_version, invalid_before; 10649dd0b82eSDavid Howells long de_version; 10651da177e4SLinus Torvalds int ret; 10661da177e4SLinus Torvalds 10670b728e19SAl Viro if (flags & LOOKUP_RCU) 1068a0753c29SDavid Howells return afs_d_revalidate_rcu(dentry); 106934286d66SNick Piggin 1070c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 10712b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 10723b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1073a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 1074260a9803SDavid Howells vnode->flags); 1075c435ee34SDavid Howells } else { 1076a455589fSAl Viro _enter("{neg n=%pd}", dentry); 1077c435ee34SDavid Howells } 10781da177e4SLinus Torvalds 1079260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 108000d3b7a4SDavid Howells if (IS_ERR(key)) 108100d3b7a4SDavid Howells key = NULL; 108200d3b7a4SDavid Howells 1083c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 1084c435ee34SDavid Howells inode = d_inode(dentry); 1085c435ee34SDavid Howells if (inode) { 1086c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1087c435ee34SDavid Howells afs_validate(vnode, key); 1088c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1089c435ee34SDavid Howells goto out_bad; 1090c435ee34SDavid Howells } 1091c435ee34SDavid Howells } 1092c435ee34SDavid Howells 10931da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 109408e0e7c8SDavid Howells parent = dget_parent(dentry); 10952b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 10961da177e4SLinus Torvalds 1097260a9803SDavid Howells /* validate the parent directory */ 1098260a9803SDavid Howells afs_validate(dir, key); 1099260a9803SDavid Howells 1100260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1101a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 1102c435ee34SDavid Howells goto out_bad_parent; 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds 1105a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1106a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1107a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1108a4ff7401SDavid Howells * version. 1109a4ff7401SDavid Howells */ 11109dd0b82eSDavid Howells dir_version = dir->status.data_version; 1111a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 11129dd0b82eSDavid Howells if (de_version == (long)dir_version) 11135dc84855SDavid Howells goto out_valid_noupdate; 1114a4ff7401SDavid Howells 111540fc8102SDavid Howells invalid_before = dir->invalid_before; 111640fc8102SDavid Howells if (de_version - (long)invalid_before >= 0) 1117a4ff7401SDavid Howells goto out_valid; 1118260a9803SDavid Howells 111908e0e7c8SDavid Howells _debug("dir modified"); 1120d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds /* search the directory for this vnode */ 11239dd0b82eSDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); 1124260a9803SDavid Howells switch (ret) { 1125260a9803SDavid Howells case 0: 1126260a9803SDavid Howells /* the filename maps to something */ 11272b0143b5SDavid Howells if (d_really_is_negative(dentry)) 1128c435ee34SDavid Howells goto out_bad_parent; 1129c435ee34SDavid Howells inode = d_inode(dentry); 1130c435ee34SDavid Howells if (is_bad_inode(inode)) { 1131a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1132a455589fSAl Viro dentry); 1133c435ee34SDavid Howells goto out_bad_parent; 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds 1136c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1137c435ee34SDavid Howells 11381da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 11391da177e4SLinus Torvalds * different file */ 114008e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 11413b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1142a455589fSAl Viro dentry, fid.vnode, 114308e0e7c8SDavid Howells vnode->fid.vnode); 11441da177e4SLinus Torvalds goto not_found; 11451da177e4SLinus Torvalds } 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1148260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1149260a9803SDavid Howells * been reused */ 115008e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1151a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1152a455589fSAl Viro dentry, fid.unique, 11537a224228SJean Noel Cordenner vnode->fid.unique, 1154c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1155c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 115608e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1157c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1158260a9803SDavid Howells goto not_found; 1159260a9803SDavid Howells } 1160260a9803SDavid Howells goto out_valid; 1161260a9803SDavid Howells 1162260a9803SDavid Howells case -ENOENT: 1163260a9803SDavid Howells /* the filename is unknown */ 1164a455589fSAl Viro _debug("%pd: dirent not found", dentry); 11652b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1166260a9803SDavid Howells goto not_found; 1167260a9803SDavid Howells goto out_valid; 1168260a9803SDavid Howells 1169260a9803SDavid Howells default: 1170a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1171a455589fSAl Viro parent, ret); 1172c435ee34SDavid Howells goto out_bad_parent; 11731da177e4SLinus Torvalds } 117408e0e7c8SDavid Howells 11751da177e4SLinus Torvalds out_valid: 11769dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)dir_version; 11775dc84855SDavid Howells out_valid_noupdate: 11781da177e4SLinus Torvalds dput(parent); 117900d3b7a4SDavid Howells key_put(key); 11801da177e4SLinus Torvalds _leave(" = 1 [valid]"); 11811da177e4SLinus Torvalds return 1; 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 11841da177e4SLinus Torvalds not_found: 11851da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 11861da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 11871da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 11881da177e4SLinus Torvalds 1189c435ee34SDavid Howells out_bad_parent: 1190a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 11911da177e4SLinus Torvalds dput(parent); 1192c435ee34SDavid Howells out_bad: 119300d3b7a4SDavid Howells key_put(key); 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds _leave(" = 0 [bad]"); 11961da177e4SLinus Torvalds return 0; 1197ec26815aSDavid Howells } 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds /* 12001da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 12011da177e4SLinus Torvalds * sleep) 12021da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 12031da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 12041da177e4SLinus Torvalds */ 1205fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 12061da177e4SLinus Torvalds { 1207a455589fSAl Viro _enter("%pd", dentry); 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 12101da177e4SLinus Torvalds goto zap; 12111da177e4SLinus Torvalds 12122b0143b5SDavid Howells if (d_really_is_positive(dentry) && 12132b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 12142b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 12151da177e4SLinus Torvalds goto zap; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds _leave(" = 0 [keep]"); 12181da177e4SLinus Torvalds return 0; 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds zap: 12211da177e4SLinus Torvalds _leave(" = 1 [zap]"); 12221da177e4SLinus Torvalds return 1; 1223ec26815aSDavid Howells } 1224260a9803SDavid Howells 1225260a9803SDavid Howells /* 122679ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 122779ddbfa5SDavid Howells */ 122879ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 122979ddbfa5SDavid Howells { 123079ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 123179ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 123279ddbfa5SDavid Howells iput(inode); 123379ddbfa5SDavid Howells } 123479ddbfa5SDavid Howells 123579ddbfa5SDavid Howells /* 1236260a9803SDavid Howells * handle dentry release 1237260a9803SDavid Howells */ 123866c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1239260a9803SDavid Howells { 1240a455589fSAl Viro _enter("%pd", dentry); 1241260a9803SDavid Howells } 1242260a9803SDavid Howells 1243728279a5SDavid Howells void afs_check_for_remote_deletion(struct afs_operation *op) 1244728279a5SDavid Howells { 1245728279a5SDavid Howells struct afs_vnode *vnode = op->file[0].vnode; 1246728279a5SDavid Howells 1247728279a5SDavid Howells switch (op->ac.abort_code) { 1248728279a5SDavid Howells case VNOVNODE: 1249728279a5SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1250728279a5SDavid Howells afs_break_callback(vnode, afs_cb_break_for_deleted); 1251728279a5SDavid Howells } 1252728279a5SDavid Howells } 1253728279a5SDavid Howells 1254260a9803SDavid Howells /* 1255d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1256d2ddc776SDavid Howells */ 1257e49c7b2fSDavid Howells static void afs_vnode_new_inode(struct afs_operation *op) 1258d2ddc776SDavid Howells { 1259e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 12605a813276SDavid Howells struct afs_vnode *vnode; 1261d2ddc776SDavid Howells struct inode *inode; 1262d2ddc776SDavid Howells 1263e49c7b2fSDavid Howells _enter(""); 1264d2ddc776SDavid Howells 1265e49c7b2fSDavid Howells ASSERTCMP(op->error, ==, 0); 1266e49c7b2fSDavid Howells 1267e49c7b2fSDavid Howells inode = afs_iget(op, vp); 1268d2ddc776SDavid Howells if (IS_ERR(inode)) { 1269d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1270d2ddc776SDavid Howells * the new directory on the server. 1271d2ddc776SDavid Howells */ 1272e49c7b2fSDavid Howells op->error = PTR_ERR(inode); 1273d2ddc776SDavid Howells return; 1274d2ddc776SDavid Howells } 1275d2ddc776SDavid Howells 12765a813276SDavid Howells vnode = AFS_FS_I(inode); 12775a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1278e49c7b2fSDavid Howells if (!op->error) 1279e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); 1280e49c7b2fSDavid Howells d_instantiate(op->dentry, inode); 1281d2ddc776SDavid Howells } 1282d2ddc776SDavid Howells 1283e49c7b2fSDavid Howells static void afs_create_success(struct afs_operation *op) 1284b8359153SDavid Howells { 1285e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1286da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1287e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1288e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1289e49c7b2fSDavid Howells afs_vnode_new_inode(op); 1290b8359153SDavid Howells } 1291b8359153SDavid Howells 1292e49c7b2fSDavid Howells static void afs_create_edit_dir(struct afs_operation *op) 12939dd0b82eSDavid Howells { 1294e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1295e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1296e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1297e49c7b2fSDavid Howells 1298e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1299e49c7b2fSDavid Howells 1300e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1301e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1302e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1303e49c7b2fSDavid Howells afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, 1304e49c7b2fSDavid Howells op->create.reason); 1305e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 13069dd0b82eSDavid Howells } 13079dd0b82eSDavid Howells 1308e49c7b2fSDavid Howells static void afs_create_put(struct afs_operation *op) 1309e49c7b2fSDavid Howells { 1310e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1311e49c7b2fSDavid Howells 1312e49c7b2fSDavid Howells if (op->error) 1313e49c7b2fSDavid Howells d_drop(op->dentry); 1314e49c7b2fSDavid Howells } 1315e49c7b2fSDavid Howells 1316e49c7b2fSDavid Howells static const struct afs_operation_ops afs_mkdir_operation = { 1317e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_make_dir, 1318e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_make_dir, 1319e49c7b2fSDavid Howells .success = afs_create_success, 1320728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1321e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1322e49c7b2fSDavid Howells .put = afs_create_put, 1323e49c7b2fSDavid Howells }; 1324e49c7b2fSDavid Howells 13259dd0b82eSDavid Howells /* 1326260a9803SDavid Howells * create a directory on an AFS filesystem 1327260a9803SDavid Howells */ 132818bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1329260a9803SDavid Howells { 1330e49c7b2fSDavid Howells struct afs_operation *op; 1331d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1332260a9803SDavid Howells 13333b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1334a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1335260a9803SDavid Howells 1336e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1337e49c7b2fSDavid Howells if (IS_ERR(op)) { 1338260a9803SDavid Howells d_drop(dentry); 1339e49c7b2fSDavid Howells return PTR_ERR(op); 1340e49c7b2fSDavid Howells } 1341e49c7b2fSDavid Howells 1342e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1343e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1344da8d0755SDavid Howells op->file[0].update_ctime = true; 1345e49c7b2fSDavid Howells op->dentry = dentry; 1346e49c7b2fSDavid Howells op->create.mode = S_IFDIR | mode; 1347e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_mkdir; 1348e49c7b2fSDavid Howells op->ops = &afs_mkdir_operation; 1349e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1350260a9803SDavid Howells } 1351260a9803SDavid Howells 1352260a9803SDavid Howells /* 1353d2ddc776SDavid Howells * Remove a subdir from a directory. 1354260a9803SDavid Howells */ 1355d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1356260a9803SDavid Howells { 13572b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1358d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1359d2ddc776SDavid Howells 1360260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1361260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1362c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 136363a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1364260a9803SDavid Howells } 1365260a9803SDavid Howells } 1366260a9803SDavid Howells 1367e49c7b2fSDavid Howells static void afs_rmdir_success(struct afs_operation *op) 1368e49c7b2fSDavid Howells { 1369e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1370da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1371e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1372e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1373e49c7b2fSDavid Howells } 1374e49c7b2fSDavid Howells 1375e49c7b2fSDavid Howells static void afs_rmdir_edit_dir(struct afs_operation *op) 1376e49c7b2fSDavid Howells { 1377e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1378e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1379e49c7b2fSDavid Howells 1380e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1381e49c7b2fSDavid Howells afs_dir_remove_subdir(op->dentry); 1382e49c7b2fSDavid Howells 1383e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1384e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1385e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1386e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1387e49c7b2fSDavid Howells afs_edit_dir_for_rmdir); 1388e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1389e49c7b2fSDavid Howells } 1390e49c7b2fSDavid Howells 1391e49c7b2fSDavid Howells static void afs_rmdir_put(struct afs_operation *op) 1392e49c7b2fSDavid Howells { 1393e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1394e49c7b2fSDavid Howells if (op->file[1].vnode) 1395e49c7b2fSDavid Howells up_write(&op->file[1].vnode->rmdir_lock); 1396e49c7b2fSDavid Howells } 1397e49c7b2fSDavid Howells 1398e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rmdir_operation = { 1399e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_dir, 1400e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_dir, 1401e49c7b2fSDavid Howells .success = afs_rmdir_success, 1402728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1403e49c7b2fSDavid Howells .edit_dir = afs_rmdir_edit_dir, 1404e49c7b2fSDavid Howells .put = afs_rmdir_put, 1405e49c7b2fSDavid Howells }; 1406e49c7b2fSDavid Howells 1407260a9803SDavid Howells /* 1408d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1409260a9803SDavid Howells */ 1410d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1411260a9803SDavid Howells { 1412e49c7b2fSDavid Howells struct afs_operation *op; 1413f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1414260a9803SDavid Howells int ret; 1415260a9803SDavid Howells 14163b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1417a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1418260a9803SDavid Howells 1419e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1420e49c7b2fSDavid Howells if (IS_ERR(op)) 1421e49c7b2fSDavid Howells return PTR_ERR(op); 1422a58823acSDavid Howells 1423e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1424e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1425da8d0755SDavid Howells op->file[0].update_ctime = true; 1426e49c7b2fSDavid Howells 1427e49c7b2fSDavid Howells op->dentry = dentry; 1428e49c7b2fSDavid Howells op->ops = &afs_rmdir_operation; 1429260a9803SDavid Howells 1430f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1431f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1432f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1433e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1434f58db83fSDavid Howells if (ret < 0) 1435e49c7b2fSDavid Howells goto error; 1436f58db83fSDavid Howells } 1437f58db83fSDavid Howells 143879ddbfa5SDavid Howells if (vnode) { 143979ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 144079ddbfa5SDavid Howells if (ret < 0) 1441e49c7b2fSDavid Howells goto error; 1442e49c7b2fSDavid Howells op->file[1].vnode = vnode; 144379ddbfa5SDavid Howells } 144479ddbfa5SDavid Howells 1445e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1446a58823acSDavid Howells 1447d2ddc776SDavid Howells error: 1448e49c7b2fSDavid Howells return afs_put_operation(op); 1449d2ddc776SDavid Howells } 1450260a9803SDavid Howells 1451d2ddc776SDavid Howells /* 1452d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1453d2ddc776SDavid Howells * 1454d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1455d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1456d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1457d2ddc776SDavid Howells * 1458d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1459d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1460d2ddc776SDavid Howells */ 1461e49c7b2fSDavid Howells static void afs_dir_remove_link(struct afs_operation *op) 1462d2ddc776SDavid Howells { 1463e49c7b2fSDavid Howells struct afs_vnode *dvnode = op->file[0].vnode; 1464e49c7b2fSDavid Howells struct afs_vnode *vnode = op->file[1].vnode; 1465e49c7b2fSDavid Howells struct dentry *dentry = op->dentry; 1466e49c7b2fSDavid Howells int ret; 1467d2ddc776SDavid Howells 1468e49c7b2fSDavid Howells if (op->error != 0 || 1469e49c7b2fSDavid Howells (op->file[1].scb.have_status && op->file[1].scb.have_error)) 1470e49c7b2fSDavid Howells return; 1471e49c7b2fSDavid Howells if (d_really_is_positive(dentry)) 1472e49c7b2fSDavid Howells return; 1473d2ddc776SDavid Howells 147430062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 147530062bd1SDavid Howells /* Already done */ 1476a38a7558SDavid Howells } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1477a38a7558SDavid Howells write_seqlock(&vnode->cb_lock); 1478440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1479440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1480440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1481051d2525SDavid Howells __afs_break_callback(vnode, afs_cb_break_for_unlink); 1482440fbc3aSDavid Howells } 1483a38a7558SDavid Howells write_sequnlock(&vnode->cb_lock); 1484440fbc3aSDavid Howells } else { 1485051d2525SDavid Howells afs_break_callback(vnode, afs_cb_break_for_unlink); 1486440fbc3aSDavid Howells 1487d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1488e49c7b2fSDavid Howells _debug("AFS_VNODE_DELETED"); 1489d2ddc776SDavid Howells 1490e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1491e49c7b2fSDavid Howells if (ret != -ESTALE) 1492e49c7b2fSDavid Howells op->error = ret; 1493d2ddc776SDavid Howells } 1494d2ddc776SDavid Howells 1495e49c7b2fSDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error); 1496d2ddc776SDavid Howells } 1497d2ddc776SDavid Howells 1498e49c7b2fSDavid Howells static void afs_unlink_success(struct afs_operation *op) 1499e49c7b2fSDavid Howells { 1500e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1501da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1502b6489a49SDavid Howells afs_check_dir_conflict(op, &op->file[0]); 1503e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1504e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1505e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1506e49c7b2fSDavid Howells afs_dir_remove_link(op); 1507e49c7b2fSDavid Howells } 1508e49c7b2fSDavid Howells 1509e49c7b2fSDavid Howells static void afs_unlink_edit_dir(struct afs_operation *op) 1510e49c7b2fSDavid Howells { 1511e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1512e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1513e49c7b2fSDavid Howells 1514e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1515e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1516e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1517e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1518e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1519e49c7b2fSDavid Howells afs_edit_dir_for_unlink); 1520e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1521e49c7b2fSDavid Howells } 1522e49c7b2fSDavid Howells 1523e49c7b2fSDavid Howells static void afs_unlink_put(struct afs_operation *op) 1524e49c7b2fSDavid Howells { 1525e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1526e49c7b2fSDavid Howells if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) 1527e49c7b2fSDavid Howells d_rehash(op->dentry); 1528e49c7b2fSDavid Howells } 1529e49c7b2fSDavid Howells 1530e49c7b2fSDavid Howells static const struct afs_operation_ops afs_unlink_operation = { 1531e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_file, 1532e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_file, 1533e49c7b2fSDavid Howells .success = afs_unlink_success, 1534728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1535e49c7b2fSDavid Howells .edit_dir = afs_unlink_edit_dir, 1536e49c7b2fSDavid Howells .put = afs_unlink_put, 1537e49c7b2fSDavid Howells }; 1538e49c7b2fSDavid Howells 1539d2ddc776SDavid Howells /* 1540d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1541d2ddc776SDavid Howells */ 1542d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1543d2ddc776SDavid Howells { 1544e49c7b2fSDavid Howells struct afs_operation *op; 1545fa59f52fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1546fa59f52fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1547d2ddc776SDavid Howells int ret; 1548d2ddc776SDavid Howells 15493b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1550d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1551d2ddc776SDavid Howells 1552d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1553d2ddc776SDavid Howells return -ENAMETOOLONG; 1554d2ddc776SDavid Howells 1555e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1556e49c7b2fSDavid Howells if (IS_ERR(op)) 1557e49c7b2fSDavid Howells return PTR_ERR(op); 1558a58823acSDavid Howells 1559e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1560e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1561da8d0755SDavid Howells op->file[0].update_ctime = true; 1562d2ddc776SDavid Howells 1563d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1564e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1565e49c7b2fSDavid Howells if (ret < 0) { 1566e49c7b2fSDavid Howells op->error = ret; 1567e49c7b2fSDavid Howells goto error; 1568e49c7b2fSDavid Howells } 1569d2ddc776SDavid Howells 157079ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 1571fa59f52fSDavid Howells if (d_count(dentry) > 1) { 157279ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 157379ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 157479ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 1575e49c7b2fSDavid Howells op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); 1576e49c7b2fSDavid Howells goto error; 157779ddbfa5SDavid Howells } 157879ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 157979ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 158079ddbfa5SDavid Howells __d_drop(dentry); 1581e49c7b2fSDavid Howells op->unlink.need_rehash = true; 158279ddbfa5SDavid Howells } 158379ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 158479ddbfa5SDavid Howells 1585e49c7b2fSDavid Howells op->file[1].vnode = vnode; 1586da8d0755SDavid Howells op->file[1].update_ctime = true; 1587b6489a49SDavid Howells op->file[1].op_unlinked = true; 1588e49c7b2fSDavid Howells op->dentry = dentry; 1589e49c7b2fSDavid Howells op->ops = &afs_unlink_operation; 1590b6489a49SDavid Howells afs_begin_vnode_operation(op); 1591b6489a49SDavid Howells afs_wait_for_operation(op); 1592b6489a49SDavid Howells 1593b6489a49SDavid Howells /* If there was a conflict with a third party, check the status of the 1594b6489a49SDavid Howells * unlinked vnode. 1595b6489a49SDavid Howells */ 1596b6489a49SDavid Howells if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) { 1597b6489a49SDavid Howells op->file[1].update_ctime = false; 1598b6489a49SDavid Howells op->fetch_status.which = 1; 1599b6489a49SDavid Howells op->ops = &afs_fetch_status_operation; 1600b6489a49SDavid Howells afs_begin_vnode_operation(op); 1601b6489a49SDavid Howells afs_wait_for_operation(op); 1602b6489a49SDavid Howells } 1603b6489a49SDavid Howells 1604b6489a49SDavid Howells return afs_put_operation(op); 1605a58823acSDavid Howells 1606260a9803SDavid Howells error: 1607e49c7b2fSDavid Howells return afs_put_operation(op); 1608260a9803SDavid Howells } 1609260a9803SDavid Howells 1610e49c7b2fSDavid Howells static const struct afs_operation_ops afs_create_operation = { 1611e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_create_file, 1612e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_create_file, 1613e49c7b2fSDavid Howells .success = afs_create_success, 1614728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1615e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1616e49c7b2fSDavid Howells .put = afs_create_put, 1617e49c7b2fSDavid Howells }; 1618e49c7b2fSDavid Howells 1619260a9803SDavid Howells /* 1620260a9803SDavid Howells * create a regular file on an AFS filesystem 1621260a9803SDavid Howells */ 16224acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1623ebfc3b49SAl Viro bool excl) 1624260a9803SDavid Howells { 1625e49c7b2fSDavid Howells struct afs_operation *op; 162643dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1627e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1628260a9803SDavid Howells 1629e49c7b2fSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1630a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1631260a9803SDavid Howells 1632d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1633d2ddc776SDavid Howells goto error; 1634d2ddc776SDavid Howells 1635e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1636e49c7b2fSDavid Howells if (IS_ERR(op)) { 1637e49c7b2fSDavid Howells ret = PTR_ERR(op); 1638260a9803SDavid Howells goto error; 1639260a9803SDavid Howells } 1640260a9803SDavid Howells 1641e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1642e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1643da8d0755SDavid Howells op->file[0].update_ctime = true; 1644a58823acSDavid Howells 1645e49c7b2fSDavid Howells op->dentry = dentry; 1646e49c7b2fSDavid Howells op->create.mode = S_IFREG | mode; 1647e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_create; 1648e49c7b2fSDavid Howells op->ops = &afs_create_operation; 1649e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1650a58823acSDavid Howells 1651260a9803SDavid Howells error: 1652260a9803SDavid Howells d_drop(dentry); 1653260a9803SDavid Howells _leave(" = %d", ret); 1654260a9803SDavid Howells return ret; 1655260a9803SDavid Howells } 1656260a9803SDavid Howells 1657e49c7b2fSDavid Howells static void afs_link_success(struct afs_operation *op) 1658e49c7b2fSDavid Howells { 1659e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1660e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1661e49c7b2fSDavid Howells 1662e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1663da8d0755SDavid Howells op->ctime = dvp->scb.status.mtime_client; 1664e49c7b2fSDavid Howells afs_vnode_commit_status(op, dvp); 1665e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 1666e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry); 1667e49c7b2fSDavid Howells if (op->dentry_2->d_parent == op->dentry->d_parent) 1668e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry_2); 1669e49c7b2fSDavid Howells ihold(&vp->vnode->vfs_inode); 1670e49c7b2fSDavid Howells d_instantiate(op->dentry, &vp->vnode->vfs_inode); 1671e49c7b2fSDavid Howells } 1672e49c7b2fSDavid Howells 1673e49c7b2fSDavid Howells static void afs_link_put(struct afs_operation *op) 1674e49c7b2fSDavid Howells { 1675e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1676e49c7b2fSDavid Howells if (op->error) 1677e49c7b2fSDavid Howells d_drop(op->dentry); 1678e49c7b2fSDavid Howells } 1679e49c7b2fSDavid Howells 1680e49c7b2fSDavid Howells static const struct afs_operation_ops afs_link_operation = { 1681e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_link, 1682e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_link, 1683e49c7b2fSDavid Howells .success = afs_link_success, 1684728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1685e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1686e49c7b2fSDavid Howells .put = afs_link_put, 1687e49c7b2fSDavid Howells }; 1688e49c7b2fSDavid Howells 1689260a9803SDavid Howells /* 1690260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1691260a9803SDavid Howells */ 1692260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1693260a9803SDavid Howells struct dentry *dentry) 1694260a9803SDavid Howells { 1695e49c7b2fSDavid Howells struct afs_operation *op; 1696a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1697a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1698e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1699260a9803SDavid Howells 17003b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1701260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1702260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1703a455589fSAl Viro dentry); 1704260a9803SDavid Howells 1705d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1706d2ddc776SDavid Howells goto error; 1707d2ddc776SDavid Howells 1708e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1709e49c7b2fSDavid Howells if (IS_ERR(op)) { 1710e49c7b2fSDavid Howells ret = PTR_ERR(op); 1711a58823acSDavid Howells goto error; 1712260a9803SDavid Howells } 1713260a9803SDavid Howells 1714e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1715e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, vnode); 1716e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1717da8d0755SDavid Howells op->file[0].update_ctime = true; 1718da8d0755SDavid Howells op->file[1].update_ctime = true; 1719a58823acSDavid Howells 1720e49c7b2fSDavid Howells op->dentry = dentry; 1721e49c7b2fSDavid Howells op->dentry_2 = from; 1722e49c7b2fSDavid Howells op->ops = &afs_link_operation; 1723e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_link; 1724e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1725260a9803SDavid Howells 1726260a9803SDavid Howells error: 1727260a9803SDavid Howells d_drop(dentry); 1728260a9803SDavid Howells _leave(" = %d", ret); 1729260a9803SDavid Howells return ret; 1730260a9803SDavid Howells } 1731260a9803SDavid Howells 1732e49c7b2fSDavid Howells static const struct afs_operation_ops afs_symlink_operation = { 1733e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_symlink, 1734e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_symlink, 1735e49c7b2fSDavid Howells .success = afs_create_success, 1736728279a5SDavid Howells .aborted = afs_check_for_remote_deletion, 1737e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1738e49c7b2fSDavid Howells .put = afs_create_put, 1739e49c7b2fSDavid Howells }; 1740e49c7b2fSDavid Howells 1741260a9803SDavid Howells /* 1742260a9803SDavid Howells * create a symlink in an AFS filesystem 1743260a9803SDavid Howells */ 1744260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1745260a9803SDavid Howells const char *content) 1746260a9803SDavid Howells { 1747e49c7b2fSDavid Howells struct afs_operation *op; 1748d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1749260a9803SDavid Howells int ret; 1750260a9803SDavid Howells 17513b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1752a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1753260a9803SDavid Howells content); 1754260a9803SDavid Howells 1755d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1756d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1757d2ddc776SDavid Howells goto error; 1758d2ddc776SDavid Howells 1759260a9803SDavid Howells ret = -EINVAL; 176045222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1761260a9803SDavid Howells goto error; 1762260a9803SDavid Howells 1763e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1764e49c7b2fSDavid Howells if (IS_ERR(op)) { 1765e49c7b2fSDavid Howells ret = PTR_ERR(op); 1766a58823acSDavid Howells goto error; 1767260a9803SDavid Howells } 1768260a9803SDavid Howells 1769e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1770e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1771a58823acSDavid Howells 1772e49c7b2fSDavid Howells op->dentry = dentry; 1773e49c7b2fSDavid Howells op->ops = &afs_symlink_operation; 1774e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_symlink; 1775e49c7b2fSDavid Howells op->create.symlink = content; 1776e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1777d2ddc776SDavid Howells 1778260a9803SDavid Howells error: 1779260a9803SDavid Howells d_drop(dentry); 1780260a9803SDavid Howells _leave(" = %d", ret); 1781260a9803SDavid Howells return ret; 1782260a9803SDavid Howells } 1783260a9803SDavid Howells 1784e49c7b2fSDavid Howells static void afs_rename_success(struct afs_operation *op) 1785260a9803SDavid Howells { 1786e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1787e49c7b2fSDavid Howells 1788da8d0755SDavid Howells op->ctime = op->file[0].scb.status.mtime_client; 1789b6489a49SDavid Howells afs_check_dir_conflict(op, &op->file[1]); 1790e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1791da8d0755SDavid Howells if (op->file[1].vnode != op->file[0].vnode) { 1792da8d0755SDavid Howells op->ctime = op->file[1].scb.status.mtime_client; 1793e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1794e49c7b2fSDavid Howells } 1795da8d0755SDavid Howells } 1796e49c7b2fSDavid Howells 1797e49c7b2fSDavid Howells static void afs_rename_edit_dir(struct afs_operation *op) 1798e49c7b2fSDavid Howells { 1799e49c7b2fSDavid Howells struct afs_vnode_param *orig_dvp = &op->file[0]; 1800e49c7b2fSDavid Howells struct afs_vnode_param *new_dvp = &op->file[1]; 1801e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode = orig_dvp->vnode; 1802e49c7b2fSDavid Howells struct afs_vnode *new_dvnode = new_dvp->vnode; 1803e49c7b2fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); 1804e49c7b2fSDavid Howells struct dentry *old_dentry = op->dentry; 1805e49c7b2fSDavid Howells struct dentry *new_dentry = op->dentry_2; 180679ddbfa5SDavid Howells struct inode *new_inode; 1807260a9803SDavid Howells 1808e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 18091cd66c93SMiklos Szeredi 1810e49c7b2fSDavid Howells if (op->rename.rehash) { 1811e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1812e49c7b2fSDavid Howells op->rename.rehash = NULL; 1813260a9803SDavid Howells } 1814260a9803SDavid Howells 18152105c282SDavid Howells down_write(&orig_dvnode->validate_lock); 18162105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && 1817e49c7b2fSDavid Howells orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) 181863a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 181979ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 182063a4681fSDavid Howells 1821e49c7b2fSDavid Howells if (new_dvnode != orig_dvnode) { 1822e49c7b2fSDavid Howells up_write(&orig_dvnode->validate_lock); 18232105c282SDavid Howells down_write(&new_dvnode->validate_lock); 18242105c282SDavid Howells } 1825e49c7b2fSDavid Howells 18262105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && 1827e49c7b2fSDavid Howells new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { 1828e49c7b2fSDavid Howells if (!op->rename.new_negative) 182963a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 183079ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 183163a4681fSDavid Howells 183263a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 183379ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 18342105c282SDavid Howells } 183579ddbfa5SDavid Howells 183679ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 183779ddbfa5SDavid Howells if (new_inode) { 183879ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 183979ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 184079ddbfa5SDavid Howells drop_nlink(new_inode); 184179ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 184279ddbfa5SDavid Howells } 18439dd0b82eSDavid Howells 18449dd0b82eSDavid Howells /* Now we can update d_fsdata on the dentries to reflect their 18459dd0b82eSDavid Howells * new parent's data_version. 18469dd0b82eSDavid Howells * 18479dd0b82eSDavid Howells * Note that if we ever implement RENAME_EXCHANGE, we'll have 18489dd0b82eSDavid Howells * to update both dentries with opposing dir versions. 18499dd0b82eSDavid Howells */ 1850e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry); 1851e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry_2); 1852e49c7b2fSDavid Howells 185379ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 1854e49c7b2fSDavid Howells 18552105c282SDavid Howells up_write(&new_dvnode->validate_lock); 185663a4681fSDavid Howells } 185763a4681fSDavid Howells 1858e49c7b2fSDavid Howells static void afs_rename_put(struct afs_operation *op) 1859e49c7b2fSDavid Howells { 1860e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1861e49c7b2fSDavid Howells if (op->rename.rehash) 1862e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1863e49c7b2fSDavid Howells dput(op->rename.tmp); 1864e49c7b2fSDavid Howells if (op->error) 1865e49c7b2fSDavid Howells d_rehash(op->dentry); 1866e49c7b2fSDavid Howells } 1867e49c7b2fSDavid Howells 1868e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rename_operation = { 1869e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_rename, 1870e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_rename, 1871e49c7b2fSDavid Howells .success = afs_rename_success, 1872e49c7b2fSDavid Howells .edit_dir = afs_rename_edit_dir, 1873e49c7b2fSDavid Howells .put = afs_rename_put, 1874e49c7b2fSDavid Howells }; 1875e49c7b2fSDavid Howells 1876e49c7b2fSDavid Howells /* 1877e49c7b2fSDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1878e49c7b2fSDavid Howells */ 1879e49c7b2fSDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1880e49c7b2fSDavid Howells struct inode *new_dir, struct dentry *new_dentry, 1881e49c7b2fSDavid Howells unsigned int flags) 1882e49c7b2fSDavid Howells { 1883e49c7b2fSDavid Howells struct afs_operation *op; 1884e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1885e49c7b2fSDavid Howells int ret; 1886e49c7b2fSDavid Howells 1887e49c7b2fSDavid Howells if (flags) 1888e49c7b2fSDavid Howells return -EINVAL; 1889e49c7b2fSDavid Howells 1890e49c7b2fSDavid Howells /* Don't allow silly-rename files be moved around. */ 1891e49c7b2fSDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 1892e49c7b2fSDavid Howells return -EINVAL; 1893e49c7b2fSDavid Howells 1894e49c7b2fSDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1895e49c7b2fSDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1896e49c7b2fSDavid Howells new_dvnode = AFS_FS_I(new_dir); 1897e49c7b2fSDavid Howells 1898e49c7b2fSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1899e49c7b2fSDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1900e49c7b2fSDavid Howells vnode->fid.vid, vnode->fid.vnode, 1901e49c7b2fSDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1902e49c7b2fSDavid Howells new_dentry); 1903e49c7b2fSDavid Howells 1904e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, orig_dvnode->volume); 1905e49c7b2fSDavid Howells if (IS_ERR(op)) 1906e49c7b2fSDavid Howells return PTR_ERR(op); 1907e49c7b2fSDavid Howells 1908e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, orig_dvnode); 1909e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ 1910e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1911e49c7b2fSDavid Howells op->file[1].dv_delta = 1; 1912da8d0755SDavid Howells op->file[0].update_ctime = true; 1913da8d0755SDavid Howells op->file[1].update_ctime = true; 1914e49c7b2fSDavid Howells 1915e49c7b2fSDavid Howells op->dentry = old_dentry; 1916e49c7b2fSDavid Howells op->dentry_2 = new_dentry; 1917e49c7b2fSDavid Howells op->rename.new_negative = d_is_negative(new_dentry); 1918e49c7b2fSDavid Howells op->ops = &afs_rename_operation; 1919e49c7b2fSDavid Howells 1920e49c7b2fSDavid Howells /* For non-directories, check whether the target is busy and if so, 1921e49c7b2fSDavid Howells * make a copy of the dentry and then do a silly-rename. If the 1922e49c7b2fSDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 1923e49c7b2fSDavid Howells * new target. 1924e49c7b2fSDavid Howells */ 1925e49c7b2fSDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 1926e49c7b2fSDavid Howells /* To prevent any new references to the target during the 1927e49c7b2fSDavid Howells * rename, we unhash the dentry in advance. 1928e49c7b2fSDavid Howells */ 1929e49c7b2fSDavid Howells if (!d_unhashed(new_dentry)) { 1930e49c7b2fSDavid Howells d_drop(new_dentry); 1931e49c7b2fSDavid Howells op->rename.rehash = new_dentry; 1932e49c7b2fSDavid Howells } 1933e49c7b2fSDavid Howells 1934e49c7b2fSDavid Howells if (d_count(new_dentry) > 2) { 1935e49c7b2fSDavid Howells /* copy the target dentry's name */ 1936e49c7b2fSDavid Howells ret = -ENOMEM; 1937e49c7b2fSDavid Howells op->rename.tmp = d_alloc(new_dentry->d_parent, 1938e49c7b2fSDavid Howells &new_dentry->d_name); 1939e49c7b2fSDavid Howells if (!op->rename.tmp) 1940e49c7b2fSDavid Howells goto error; 1941e49c7b2fSDavid Howells 1942e49c7b2fSDavid Howells ret = afs_sillyrename(new_dvnode, 1943e49c7b2fSDavid Howells AFS_FS_I(d_inode(new_dentry)), 1944e49c7b2fSDavid Howells new_dentry, op->key); 1945e49c7b2fSDavid Howells if (ret) 1946e49c7b2fSDavid Howells goto error; 1947e49c7b2fSDavid Howells 1948e49c7b2fSDavid Howells op->dentry_2 = op->rename.tmp; 1949e49c7b2fSDavid Howells op->rename.rehash = NULL; 1950e49c7b2fSDavid Howells op->rename.new_negative = true; 1951e49c7b2fSDavid Howells } 1952e49c7b2fSDavid Howells } 1953e49c7b2fSDavid Howells 1954e49c7b2fSDavid Howells /* This bit is potentially nasty as there's a potential race with 1955e49c7b2fSDavid Howells * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 1956e49c7b2fSDavid Howells * to reflect it's new parent's new data_version after the op, but 1957e49c7b2fSDavid Howells * d_revalidate may see old_dentry between the op having taken place 1958e49c7b2fSDavid Howells * and the version being updated. 1959e49c7b2fSDavid Howells * 1960e49c7b2fSDavid Howells * So drop the old_dentry for now to make other threads go through 1961e49c7b2fSDavid Howells * lookup instead - which we hold a lock against. 1962e49c7b2fSDavid Howells */ 1963e49c7b2fSDavid Howells d_drop(old_dentry); 1964e49c7b2fSDavid Howells 1965e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1966e49c7b2fSDavid Howells 1967260a9803SDavid Howells error: 1968e49c7b2fSDavid Howells return afs_put_operation(op); 1969260a9803SDavid Howells } 1970f3ddee8dSDavid Howells 1971f3ddee8dSDavid Howells /* 1972f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1973f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1974f3ddee8dSDavid Howells */ 1975f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1976f3ddee8dSDavid Howells { 1977f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1978f3ddee8dSDavid Howells 19793b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1980f3ddee8dSDavid Howells 1981fa04a40bSDavid Howells detach_page_private(page); 1982f3ddee8dSDavid Howells 1983f3ddee8dSDavid Howells /* The directory will need reloading. */ 1984f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1985f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1986f3ddee8dSDavid Howells return 1; 1987f3ddee8dSDavid Howells } 1988f3ddee8dSDavid Howells 1989f3ddee8dSDavid Howells /* 1990f3ddee8dSDavid Howells * invalidate part or all of a page 1991f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1992f3ddee8dSDavid Howells * the entire page) 1993f3ddee8dSDavid Howells */ 1994f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1995f3ddee8dSDavid Howells unsigned int length) 1996f3ddee8dSDavid Howells { 1997f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1998f3ddee8dSDavid Howells 1999f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 2000f3ddee8dSDavid Howells 2001f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 2002f3ddee8dSDavid Howells 2003f3ddee8dSDavid Howells /* The directory will need reloading. */ 2004f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2005f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 2006f3ddee8dSDavid Howells 2007f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 2008fa04a40bSDavid Howells if (offset == 0 && length == PAGE_SIZE) 2009fa04a40bSDavid Howells detach_page_private(page); 2010f3ddee8dSDavid Howells } 2011