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 284f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 285f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 286f3ddee8dSDavid Howells unlock_page(req->pages[i]); 287f3ddee8dSDavid Howells i++; 288f3ddee8dSDavid Howells } else { 289f3ddee8dSDavid Howells i += n; 290f3ddee8dSDavid Howells } 291f3ddee8dSDavid Howells } while (i < req->nr_pages); 292f3ddee8dSDavid Howells 293f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 294f3ddee8dSDavid Howells * races. 295f3ddee8dSDavid Howells */ 296f3ddee8dSDavid Howells ret = -ERESTARTSYS; 297b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 298b61f7dcfSDavid Howells goto error; 299f3ddee8dSDavid Howells 300f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 301f3ddee8dSDavid Howells goto success; 302f3ddee8dSDavid Howells 303b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 304b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 305b61f7dcfSDavid Howells goto error; 306b61f7dcfSDavid Howells 307b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 30899987c56SDavid Howells trace_afs_reload_dir(dvnode); 309f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 310f3ddee8dSDavid Howells if (ret < 0) 311b61f7dcfSDavid Howells goto error_unlock; 312f3ddee8dSDavid Howells 313f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 314f3ddee8dSDavid Howells 315f3ddee8dSDavid Howells if (req->len < req->file_size) 316f3ddee8dSDavid Howells goto content_has_grown; 317f3ddee8dSDavid Howells 318f3ddee8dSDavid Howells /* Validate the data we just read. */ 319f3ddee8dSDavid Howells ret = -EIO; 320445b1028SDavid Howells if (!afs_dir_check_pages(dvnode, req)) 321b61f7dcfSDavid Howells goto error_unlock; 322f3ddee8dSDavid Howells 323f3ddee8dSDavid Howells // TODO: Trim excess pages 324f3ddee8dSDavid Howells 325f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 326f3ddee8dSDavid Howells } 327f3ddee8dSDavid Howells 328b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 329f3ddee8dSDavid Howells success: 330f3ddee8dSDavid Howells return req; 331f3ddee8dSDavid Howells 332f3ddee8dSDavid Howells error_unlock: 333b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 334f3ddee8dSDavid Howells error: 335f3ddee8dSDavid Howells afs_put_read(req); 336f3ddee8dSDavid Howells _leave(" = %d", ret); 337f3ddee8dSDavid Howells return ERR_PTR(ret); 338f3ddee8dSDavid Howells 339f3ddee8dSDavid Howells content_has_grown: 340b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 341f3ddee8dSDavid Howells afs_put_read(req); 342f3ddee8dSDavid Howells goto retry; 343f3ddee8dSDavid Howells } 344f3ddee8dSDavid Howells 345f3ddee8dSDavid Howells /* 3461da177e4SLinus Torvalds * deal with one block in an AFS directory 3471da177e4SLinus Torvalds */ 348f51375cdSDavid Howells static int afs_dir_iterate_block(struct afs_vnode *dvnode, 349f51375cdSDavid Howells struct dir_context *ctx, 35000317636SDavid Howells union afs_xdr_dir_block *block, 3511bbae9f8SAl Viro unsigned blkoff) 3521da177e4SLinus Torvalds { 35300317636SDavid Howells union afs_xdr_dirent *dire; 3541da177e4SLinus Torvalds unsigned offset, next, curr; 3551da177e4SLinus Torvalds size_t nlen; 3561bbae9f8SAl Viro int tmp; 3571da177e4SLinus Torvalds 3581bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3591da177e4SLinus Torvalds 36000317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3634ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3644ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3651da177e4SLinus Torvalds offset = next 3661da177e4SLinus Torvalds ) { 3671da177e4SLinus Torvalds next = offset + 1; 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 37000317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3711da177e4SLinus Torvalds (1 << (offset % 8)))) { 3725b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 37300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3741da177e4SLinus Torvalds if (offset >= curr) 3751bbae9f8SAl Viro ctx->pos = blkoff + 37600317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3771da177e4SLinus Torvalds continue; 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* got a valid entry */ 3811da177e4SLinus Torvalds dire = &block->dirents[offset]; 3821da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3831da177e4SLinus Torvalds sizeof(*block) - 38400317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3851da177e4SLinus Torvalds 3865b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 38700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3881da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3891da177e4SLinus Torvalds nlen, dire->u.name); 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* work out where the next possible entry is */ 39200317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3934ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 3945b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3951da177e4SLinus Torvalds " %u travelled beyond end dir block" 3965b5e0928SAlexey Dobriyan " (len %u/%zu)", 39700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 3981da177e4SLinus Torvalds offset, next, tmp, nlen); 399f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_over_end); 4001da177e4SLinus Torvalds } 40100317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 4021da177e4SLinus Torvalds (1 << (next % 8)))) { 4035b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4045b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 40500317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4061da177e4SLinus Torvalds offset, next, tmp, nlen); 407f51375cdSDavid Howells return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4105b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 41100317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 4121da177e4SLinus Torvalds next, tmp, nlen); 4131da177e4SLinus Torvalds next++; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* skip if starts before the current position */ 4171da177e4SLinus Torvalds if (offset < curr) 4181da177e4SLinus Torvalds continue; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds /* found the next entry */ 4211bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4221da177e4SLinus Torvalds ntohl(dire->u.vnode), 4235cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4245cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4251bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4261da177e4SLinus Torvalds _leave(" = 0 [full]"); 4271da177e4SLinus Torvalds return 0; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 43000317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4311da177e4SLinus Torvalds } 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds _leave(" = 1 [more]"); 4341da177e4SLinus Torvalds return 1; 435ec26815aSDavid Howells } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /* 43808e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4391da177e4SLinus Torvalds */ 4401bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4419dd0b82eSDavid Howells struct key *key, afs_dataversion_t *_dir_version) 4421da177e4SLinus Torvalds { 443f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 44400317636SDavid Howells struct afs_xdr_dir_page *dbuf; 44500317636SDavid Howells union afs_xdr_dir_block *dblock; 446f3ddee8dSDavid Howells struct afs_read *req; 4471da177e4SLinus Torvalds struct page *page; 4481da177e4SLinus Torvalds unsigned blkoff, limit; 4491da177e4SLinus Torvalds int ret; 4501da177e4SLinus Torvalds 4511bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4521da177e4SLinus Torvalds 45308e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4541da177e4SLinus Torvalds _leave(" = -ESTALE"); 4551da177e4SLinus Torvalds return -ESTALE; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds 458f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 459f3ddee8dSDavid Howells if (IS_ERR(req)) 460f3ddee8dSDavid Howells return PTR_ERR(req); 4619dd0b82eSDavid Howells *_dir_version = req->data_version; 462f3ddee8dSDavid Howells 4631da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 46400317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 46500317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4681da177e4SLinus Torvalds ret = 0; 469f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 47000317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4711da177e4SLinus Torvalds 472f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 473f3ddee8dSDavid Howells * to the LRU. 474f3ddee8dSDavid Howells */ 475f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 476f3ddee8dSDavid Howells if (!page) { 477f51375cdSDavid Howells ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 4781da177e4SLinus Torvalds break; 4791da177e4SLinus Torvalds } 480f3ddee8dSDavid Howells mark_page_accessed(page); 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4831da177e4SLinus Torvalds 484f3ddee8dSDavid Howells dbuf = kmap(page); 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4871da177e4SLinus Torvalds do { 4881da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 48900317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 490f51375cdSDavid Howells ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); 4911da177e4SLinus Torvalds if (ret != 1) { 492f3ddee8dSDavid Howells kunmap(page); 4931da177e4SLinus Torvalds goto out; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds 49600317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 4971da177e4SLinus Torvalds 4981bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 4991da177e4SLinus Torvalds 500f3ddee8dSDavid Howells kunmap(page); 5011da177e4SLinus Torvalds ret = 0; 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds out: 505b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 506f3ddee8dSDavid Howells afs_put_read(req); 5071da177e4SLinus Torvalds _leave(" = %d", ret); 5081da177e4SLinus Torvalds return ret; 509ec26815aSDavid Howells } 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* 5121da177e4SLinus Torvalds * read an AFS directory 5131da177e4SLinus Torvalds */ 5141bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5151da177e4SLinus Torvalds { 5169dd0b82eSDavid Howells afs_dataversion_t dir_version; 5179dd0b82eSDavid Howells 5189dd0b82eSDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 5199dd0b82eSDavid Howells &dir_version); 520ec26815aSDavid Howells } 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds /* 5235cf9dd55SDavid Howells * Search the directory for a single name 5241da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5251da177e4SLinus Torvalds * uniquifier through dtype 5261da177e4SLinus Torvalds */ 5275cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 528ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5291da177e4SLinus Torvalds { 5305cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5315cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5321da177e4SLinus Torvalds 5331bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5341bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 535ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5361da177e4SLinus Torvalds 53708e0e7c8SDavid Howells /* insanity checks first */ 53800317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 53900317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 54008e0e7c8SDavid Howells 5411bbae9f8SAl Viro if (cookie->name.len != nlen || 5421bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5431da177e4SLinus Torvalds _leave(" = 0 [no]"); 5441da177e4SLinus Torvalds return 0; 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds cookie->fid.vnode = ino; 5481da177e4SLinus Torvalds cookie->fid.unique = dtype; 5491da177e4SLinus Torvalds cookie->found = 1; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds _leave(" = -1 [found]"); 5521da177e4SLinus Torvalds return -1; 553ec26815aSDavid Howells } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* 5565cf9dd55SDavid Howells * Do a lookup of a single name in a directory 557260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5581da177e4SLinus Torvalds */ 5595cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 5609dd0b82eSDavid Howells struct afs_fid *fid, struct key *key, 5619dd0b82eSDavid Howells afs_dataversion_t *_dir_version) 5621da177e4SLinus Torvalds { 5631bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5645cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5655cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5661bbae9f8SAl Viro .name = dentry->d_name, 5671bbae9f8SAl Viro .fid.vid = as->volume->vid 5681bbae9f8SAl Viro }; 5691da177e4SLinus Torvalds int ret; 5701da177e4SLinus Torvalds 571a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds /* search the directory */ 5749dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 5751da177e4SLinus Torvalds if (ret < 0) { 57608e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 57708e0e7c8SDavid Howells return ret; 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds ret = -ENOENT; 5811da177e4SLinus Torvalds if (!cookie.found) { 58208e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58308e0e7c8SDavid Howells return -ENOENT; 58408e0e7c8SDavid Howells } 58508e0e7c8SDavid Howells 58608e0e7c8SDavid Howells *fid = cookie.fid; 5873b6492dfSDavid Howells _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 58808e0e7c8SDavid Howells return 0; 58908e0e7c8SDavid Howells } 59008e0e7c8SDavid Howells 59108e0e7c8SDavid Howells /* 5925cf9dd55SDavid Howells * search the directory for a name 5935cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5945cf9dd55SDavid Howells * uniquifier through dtype 5955cf9dd55SDavid Howells */ 5965cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5975cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5985cf9dd55SDavid Howells { 5995cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6005cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6015cf9dd55SDavid Howells int ret; 6025cf9dd55SDavid Howells 6035cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6045cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6055cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6065cf9dd55SDavid Howells 6075cf9dd55SDavid Howells /* insanity checks first */ 60800317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 60900317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 6105cf9dd55SDavid Howells 6115cf9dd55SDavid Howells if (cookie->found) { 6125cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6135cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6145cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6155cf9dd55SDavid Howells cookie->nr_fids++; 6165cf9dd55SDavid Howells } 6175cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6185cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 619e49c7b2fSDavid Howells cookie->fids[1].vnode = ino; 620e49c7b2fSDavid Howells cookie->fids[1].unique = dtype; 6215cf9dd55SDavid Howells cookie->found = 1; 6225cf9dd55SDavid Howells if (cookie->one_only) 6235cf9dd55SDavid Howells return -1; 6245cf9dd55SDavid Howells } 6255cf9dd55SDavid Howells 6265cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6275cf9dd55SDavid Howells _leave(" = %d", ret); 6285cf9dd55SDavid Howells return ret; 6295cf9dd55SDavid Howells } 6305cf9dd55SDavid Howells 6315cf9dd55SDavid Howells /* 632e49c7b2fSDavid Howells * Deal with the result of a successful lookup operation. Turn all the files 633e49c7b2fSDavid Howells * into inodes and save the first one - which is the one we actually want. 634e49c7b2fSDavid Howells */ 635e49c7b2fSDavid Howells static void afs_do_lookup_success(struct afs_operation *op) 636e49c7b2fSDavid Howells { 637e49c7b2fSDavid Howells struct afs_vnode_param *vp; 638e49c7b2fSDavid Howells struct afs_vnode *vnode; 639e49c7b2fSDavid Howells struct inode *inode; 640e49c7b2fSDavid Howells u32 abort_code; 641e49c7b2fSDavid Howells int i; 642e49c7b2fSDavid Howells 643e49c7b2fSDavid Howells _enter(""); 644e49c7b2fSDavid Howells 645e49c7b2fSDavid Howells for (i = 0; i < op->nr_files; i++) { 646e49c7b2fSDavid Howells switch (i) { 647e49c7b2fSDavid Howells case 0: 648e49c7b2fSDavid Howells vp = &op->file[0]; 649e49c7b2fSDavid Howells abort_code = vp->scb.status.abort_code; 650e49c7b2fSDavid Howells if (abort_code != 0) { 651e49c7b2fSDavid Howells op->abort_code = abort_code; 652e49c7b2fSDavid Howells op->error = afs_abort_to_error(abort_code); 653e49c7b2fSDavid Howells } 654e49c7b2fSDavid Howells break; 655e49c7b2fSDavid Howells 656e49c7b2fSDavid Howells case 1: 657e49c7b2fSDavid Howells vp = &op->file[1]; 658e49c7b2fSDavid Howells break; 659e49c7b2fSDavid Howells 660e49c7b2fSDavid Howells default: 661e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 662e49c7b2fSDavid Howells break; 663e49c7b2fSDavid Howells } 664e49c7b2fSDavid Howells 665e49c7b2fSDavid Howells if (!vp->scb.have_status && !vp->scb.have_error) 666e49c7b2fSDavid Howells continue; 667e49c7b2fSDavid Howells 668e49c7b2fSDavid Howells _debug("do [%u]", i); 669e49c7b2fSDavid Howells if (vp->vnode) { 670e49c7b2fSDavid Howells if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) 671e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 672e49c7b2fSDavid Howells } else if (vp->scb.status.abort_code == 0) { 673e49c7b2fSDavid Howells inode = afs_iget(op, vp); 674e49c7b2fSDavid Howells if (!IS_ERR(inode)) { 675e49c7b2fSDavid Howells vnode = AFS_FS_I(inode); 676e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, 677e49c7b2fSDavid Howells 0 /* Assume vnode->cb_break is 0 */ + 678e49c7b2fSDavid Howells op->cb_v_break, 679e49c7b2fSDavid Howells &vp->scb); 680e49c7b2fSDavid Howells vp->vnode = vnode; 681e49c7b2fSDavid Howells vp->put_vnode = true; 682e49c7b2fSDavid Howells } 683e49c7b2fSDavid Howells } else { 684e49c7b2fSDavid Howells _debug("- abort %d %llx:%llx.%x", 685e49c7b2fSDavid Howells vp->scb.status.abort_code, 686e49c7b2fSDavid Howells vp->fid.vid, vp->fid.vnode, vp->fid.unique); 687e49c7b2fSDavid Howells } 688e49c7b2fSDavid Howells } 689e49c7b2fSDavid Howells 690e49c7b2fSDavid Howells _leave(""); 691e49c7b2fSDavid Howells } 692e49c7b2fSDavid Howells 693e49c7b2fSDavid Howells static const struct afs_operation_ops afs_inline_bulk_status_operation = { 694e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_inline_bulk_status, 695e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_inline_bulk_status, 696e49c7b2fSDavid Howells .success = afs_do_lookup_success, 697e49c7b2fSDavid Howells }; 698e49c7b2fSDavid Howells 699e49c7b2fSDavid Howells static const struct afs_operation_ops afs_fetch_status_operation = { 700e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_fetch_status, 701e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_fetch_status, 702e49c7b2fSDavid Howells .success = afs_do_lookup_success, 703e49c7b2fSDavid Howells }; 704e49c7b2fSDavid Howells 705e49c7b2fSDavid Howells /* 7065cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 7075cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 7085cf9dd55SDavid Howells * asked for is returned. 7095cf9dd55SDavid Howells */ 7105cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 7115cf9dd55SDavid Howells struct key *key) 7125cf9dd55SDavid Howells { 7135cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 714e49c7b2fSDavid Howells struct afs_cb_interest *dcbi; 715e49c7b2fSDavid Howells struct afs_vnode_param *vp; 716e49c7b2fSDavid Howells struct afs_operation *op; 717f642404aSDavid Howells struct afs_server *server; 71839db9815SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 71939db9815SDavid Howells struct inode *inode = NULL, *ti; 7209dd0b82eSDavid Howells afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 721e49c7b2fSDavid Howells long ret; 722e49c7b2fSDavid Howells int i; 7235cf9dd55SDavid Howells 7245cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 7255cf9dd55SDavid Howells 7265cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 7275cf9dd55SDavid Howells if (!cookie) 7285cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 7295cf9dd55SDavid Howells 730e49c7b2fSDavid Howells for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) 731e49c7b2fSDavid Howells cookie->fids[i].vid = dvnode->fid.vid; 7325cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 7335cf9dd55SDavid Howells cookie->name = dentry->d_name; 73413fcc635SDavid Howells cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want 73513fcc635SDavid Howells * and slot 1 for the directory */ 7365cf9dd55SDavid Howells 7375cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 738f642404aSDavid Howells dcbi = rcu_dereference_protected(dvnode->cb_interest, 739f642404aSDavid Howells lockdep_is_held(&dvnode->cb_lock.lock)); 740f642404aSDavid Howells if (dcbi) { 741f642404aSDavid Howells server = dcbi->server; 742f642404aSDavid Howells if (server && 743f642404aSDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 7445cf9dd55SDavid Howells cookie->one_only = true; 745f642404aSDavid Howells } 7465cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 7475cf9dd55SDavid Howells 7485cf9dd55SDavid Howells /* search the directory */ 7499dd0b82eSDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 750e49c7b2fSDavid Howells if (ret < 0) 7515cf9dd55SDavid Howells goto out; 7525cf9dd55SDavid Howells 7539dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)data_version; 7549dd0b82eSDavid Howells 755e49c7b2fSDavid Howells ret = -ENOENT; 7565cf9dd55SDavid Howells if (!cookie->found) 7575cf9dd55SDavid Howells goto out; 7585cf9dd55SDavid Howells 7595cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 760e49c7b2fSDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, 761e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &cookie->fids[1]); 7625cf9dd55SDavid Howells if (inode) 763e49c7b2fSDavid Howells goto out; /* We do */ 764e49c7b2fSDavid Howells 765e49c7b2fSDavid Howells /* Okay, we didn't find it. We need to query the server - and whilst 766e49c7b2fSDavid Howells * we're doing that, we're going to attempt to look up a bunch of other 767e49c7b2fSDavid Howells * vnodes also. 768e49c7b2fSDavid Howells */ 769e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 770e49c7b2fSDavid Howells if (IS_ERR(op)) { 771e49c7b2fSDavid Howells ret = PTR_ERR(op); 7725cf9dd55SDavid Howells goto out; 773e49c7b2fSDavid Howells } 774e49c7b2fSDavid Howells 775e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 776e49c7b2fSDavid Howells afs_op_set_fid(op, 1, &cookie->fids[1]); 777e49c7b2fSDavid Howells 778e49c7b2fSDavid Howells op->nr_files = cookie->nr_fids; 779e49c7b2fSDavid Howells _debug("nr_files %u", op->nr_files); 7805cf9dd55SDavid Howells 7815cf9dd55SDavid Howells /* Need space for examining all the selected files */ 782e49c7b2fSDavid Howells op->error = -ENOMEM; 783e49c7b2fSDavid Howells if (op->nr_files > 2) { 784e49c7b2fSDavid Howells op->more_files = kvcalloc(op->nr_files - 2, 785e49c7b2fSDavid Howells sizeof(struct afs_vnode_param), 7865cf9dd55SDavid Howells GFP_KERNEL); 787e49c7b2fSDavid Howells if (!op->more_files) 788e49c7b2fSDavid Howells goto out_op; 7895cf9dd55SDavid Howells 790e49c7b2fSDavid Howells for (i = 2; i < op->nr_files; i++) { 791e49c7b2fSDavid Howells vp = &op->more_files[i - 2]; 792e49c7b2fSDavid Howells vp->fid = cookie->fids[i]; 79339db9815SDavid Howells 79439db9815SDavid Howells /* Find any inodes that already exist and get their 79539db9815SDavid Howells * callback counters. 79639db9815SDavid Howells */ 797e49c7b2fSDavid Howells ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, 798e49c7b2fSDavid Howells afs_ilookup5_test_by_fid, &vp->fid); 79939db9815SDavid Howells if (!IS_ERR_OR_NULL(ti)) { 80039db9815SDavid Howells vnode = AFS_FS_I(ti); 801e49c7b2fSDavid Howells vp->dv_before = vnode->status.data_version; 802e49c7b2fSDavid Howells vp->cb_break_before = afs_calc_vnode_cb_break(vnode); 803e49c7b2fSDavid Howells vp->vnode = vnode; 804e49c7b2fSDavid Howells vp->put_vnode = true; 805e49c7b2fSDavid Howells } 80639db9815SDavid Howells } 80739db9815SDavid Howells } 80839db9815SDavid Howells 8095cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 8105cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 8115cf9dd55SDavid Howells * the whole operation. 8125cf9dd55SDavid Howells */ 813e49c7b2fSDavid Howells op->error = -ENOTSUPP; 814e49c7b2fSDavid Howells if (!cookie->one_only) { 815e49c7b2fSDavid Howells op->ops = &afs_inline_bulk_status_operation; 816e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 817e49c7b2fSDavid Howells afs_wait_for_operation(op); 8185cf9dd55SDavid Howells } 8195cf9dd55SDavid Howells 820e49c7b2fSDavid Howells if (op->error == -ENOTSUPP) { 821e49c7b2fSDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire 822e49c7b2fSDavid Howells * op if any of the lookups fails - so, for the moment, revert 823e49c7b2fSDavid Howells * to FS.FetchStatus for op->file[1]. 8245cf9dd55SDavid Howells */ 825e49c7b2fSDavid Howells op->fetch_status.which = 1; 826e49c7b2fSDavid Howells op->ops = &afs_fetch_status_operation; 827e49c7b2fSDavid Howells afs_begin_vnode_operation(op); 828e49c7b2fSDavid Howells afs_wait_for_operation(op); 829e49c7b2fSDavid Howells } 830e49c7b2fSDavid Howells inode = ERR_PTR(op->error); 831e49c7b2fSDavid Howells 832e49c7b2fSDavid Howells out_op: 833e49c7b2fSDavid Howells if (op->error == 0) { 834e49c7b2fSDavid Howells inode = &op->file[1].vnode->vfs_inode; 835e49c7b2fSDavid Howells op->file[1].vnode = NULL; 8365cf9dd55SDavid Howells } 8375cf9dd55SDavid Howells 838e49c7b2fSDavid Howells if (op->file[0].scb.have_status) 839e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; 840e49c7b2fSDavid Howells else 841e49c7b2fSDavid Howells dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; 842e49c7b2fSDavid Howells ret = afs_put_operation(op); 8435cf9dd55SDavid Howells out: 8445cf9dd55SDavid Howells kfree(cookie); 845e49c7b2fSDavid Howells _leave(""); 846e49c7b2fSDavid Howells return inode ?: ERR_PTR(ret); 8475cf9dd55SDavid Howells } 8485cf9dd55SDavid Howells 8495cf9dd55SDavid Howells /* 8506f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 8516f8880d8SDavid Howells */ 8526f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 8536f8880d8SDavid Howells struct key *key) 8546f8880d8SDavid Howells { 8556f8880d8SDavid Howells struct afs_sysnames *subs; 8566f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8576f8880d8SDavid Howells struct dentry *ret; 8586f8880d8SDavid Howells char *buf, *p, *name; 8596f8880d8SDavid Howells int len, i; 8606f8880d8SDavid Howells 8616f8880d8SDavid Howells _enter(""); 8626f8880d8SDavid Howells 8636f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8646f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8656f8880d8SDavid Howells if (!buf) 8666f8880d8SDavid Howells goto out_p; 8676f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8686f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8696f8880d8SDavid Howells p += dentry->d_name.len - 4; 8706f8880d8SDavid Howells } 8716f8880d8SDavid Howells 8726f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8736f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8746f8880d8SDavid Howells subs = net->sysnames; 8756f8880d8SDavid Howells refcount_inc(&subs->usage); 8766f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8776f8880d8SDavid Howells 8786f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8796f8880d8SDavid Howells name = subs->subs[i]; 8806f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8816f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8826f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8836f8880d8SDavid Howells goto out_s; 8846f8880d8SDavid Howells } 8856f8880d8SDavid Howells 8866f8880d8SDavid Howells strcpy(p, name); 8876f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8886f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8896f8880d8SDavid Howells goto out_s; 8906f8880d8SDavid Howells dput(ret); 8916f8880d8SDavid Howells } 8926f8880d8SDavid Howells 8936f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8946f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8956f8880d8SDavid Howells */ 8966f8880d8SDavid Howells ret = NULL; 8976f8880d8SDavid Howells out_s: 8986f8880d8SDavid Howells afs_put_sysnames(subs); 8996f8880d8SDavid Howells kfree(buf); 9006f8880d8SDavid Howells out_p: 9016f8880d8SDavid Howells key_put(key); 9026f8880d8SDavid Howells return ret; 9036f8880d8SDavid Howells } 9046f8880d8SDavid Howells 9056f8880d8SDavid Howells /* 90608e0e7c8SDavid Howells * look up an entry in a directory 90708e0e7c8SDavid Howells */ 908260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 90900cd8dd3SAl Viro unsigned int flags) 91008e0e7c8SDavid Howells { 9115cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 91240a708bdSDavid Howells struct afs_fid fid = {}; 91308e0e7c8SDavid Howells struct inode *inode; 91434b2a88fSAl Viro struct dentry *d; 91500d3b7a4SDavid Howells struct key *key; 91608e0e7c8SDavid Howells int ret; 91708e0e7c8SDavid Howells 9183b6492dfSDavid Howells _enter("{%llx:%llu},%p{%pd},", 9195cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 920260a9803SDavid Howells 9212b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 92208e0e7c8SDavid Howells 92345222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 92408e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 92508e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 92608e0e7c8SDavid Howells } 92708e0e7c8SDavid Howells 9285cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 92908e0e7c8SDavid Howells _leave(" = -ESTALE"); 93008e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 93108e0e7c8SDavid Howells } 93208e0e7c8SDavid Howells 9335cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 93400d3b7a4SDavid Howells if (IS_ERR(key)) { 93500d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 936e231c2eeSDavid Howells return ERR_CAST(key); 93700d3b7a4SDavid Howells } 93800d3b7a4SDavid Howells 9395cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 94008e0e7c8SDavid Howells if (ret < 0) { 94100d3b7a4SDavid Howells key_put(key); 942260a9803SDavid Howells _leave(" = %d [val]", ret); 9431da177e4SLinus Torvalds return ERR_PTR(ret); 9441da177e4SLinus Torvalds } 9451da177e4SLinus Torvalds 9466f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 9476f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 9486f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 9496f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 9506f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 9516f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 9526f8880d8SDavid Howells 953d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 9545cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 95534b2a88fSAl Viro key_put(key); 956f52b83b0SDavid Howells if (inode == ERR_PTR(-ENOENT)) 9575cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 95840a708bdSDavid Howells 95940a708bdSDavid Howells if (!IS_ERR_OR_NULL(inode)) 96040a708bdSDavid Howells fid = AFS_FS_I(inode)->fid; 96140a708bdSDavid Howells 962e49c7b2fSDavid Howells _debug("splice %px", dentry->d_inode); 96334b2a88fSAl Viro d = d_splice_alias(inode, dentry); 96480548b03SDavid Howells if (!IS_ERR_OR_NULL(d)) { 96534b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 96640a708bdSDavid Howells trace_afs_lookup(dvnode, &d->d_name, &fid); 96780548b03SDavid Howells } else { 96840a708bdSDavid Howells trace_afs_lookup(dvnode, &dentry->d_name, &fid); 96980548b03SDavid Howells } 970e49c7b2fSDavid Howells _leave(""); 97134b2a88fSAl Viro return d; 972ec26815aSDavid Howells } 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds /* 975a0753c29SDavid Howells * Check the validity of a dentry under RCU conditions. 976a0753c29SDavid Howells */ 977a0753c29SDavid Howells static int afs_d_revalidate_rcu(struct dentry *dentry) 978a0753c29SDavid Howells { 979a0753c29SDavid Howells struct afs_vnode *dvnode, *vnode; 980a0753c29SDavid Howells struct dentry *parent; 981a0753c29SDavid Howells struct inode *dir, *inode; 982a0753c29SDavid Howells long dir_version, de_version; 983a0753c29SDavid Howells 984a0753c29SDavid Howells _enter("%p", dentry); 985a0753c29SDavid Howells 986a0753c29SDavid Howells /* Check the parent directory is still valid first. */ 987a0753c29SDavid Howells parent = READ_ONCE(dentry->d_parent); 988a0753c29SDavid Howells dir = d_inode_rcu(parent); 989a0753c29SDavid Howells if (!dir) 990a0753c29SDavid Howells return -ECHILD; 991a0753c29SDavid Howells dvnode = AFS_FS_I(dir); 992a0753c29SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 993a0753c29SDavid Howells return -ECHILD; 994a0753c29SDavid Howells 995a0753c29SDavid Howells if (!afs_check_validity(dvnode)) 996a0753c29SDavid Howells return -ECHILD; 997a0753c29SDavid Howells 998a0753c29SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 999a0753c29SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1000a0753c29SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1001a0753c29SDavid Howells * version. 1002a0753c29SDavid Howells */ 1003a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->status.data_version); 1004a0753c29SDavid Howells de_version = (long)READ_ONCE(dentry->d_fsdata); 1005a0753c29SDavid Howells if (de_version != dir_version) { 1006a0753c29SDavid Howells dir_version = (long)READ_ONCE(dvnode->invalid_before); 1007a0753c29SDavid Howells if (de_version - dir_version < 0) 1008a0753c29SDavid Howells return -ECHILD; 1009a0753c29SDavid Howells } 1010a0753c29SDavid Howells 1011a0753c29SDavid Howells /* Check to see if the vnode referred to by the dentry still 1012a0753c29SDavid Howells * has a callback. 1013a0753c29SDavid Howells */ 1014a0753c29SDavid Howells if (d_really_is_positive(dentry)) { 1015a0753c29SDavid Howells inode = d_inode_rcu(dentry); 1016a0753c29SDavid Howells if (inode) { 1017a0753c29SDavid Howells vnode = AFS_FS_I(inode); 1018a0753c29SDavid Howells if (!afs_check_validity(vnode)) 1019a0753c29SDavid Howells return -ECHILD; 1020a0753c29SDavid Howells } 1021a0753c29SDavid Howells } 1022a0753c29SDavid Howells 1023a0753c29SDavid Howells return 1; /* Still valid */ 1024a0753c29SDavid Howells } 1025a0753c29SDavid Howells 1026a0753c29SDavid Howells /* 10271da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 10281da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 10291da177e4SLinus Torvalds * inode 10301da177e4SLinus Torvalds */ 10310b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 10321da177e4SLinus Torvalds { 1033260a9803SDavid Howells struct afs_vnode *vnode, *dir; 1034dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 10351da177e4SLinus Torvalds struct dentry *parent; 1036c435ee34SDavid Howells struct inode *inode; 103700d3b7a4SDavid Howells struct key *key; 103840fc8102SDavid Howells afs_dataversion_t dir_version, invalid_before; 10399dd0b82eSDavid Howells long de_version; 10401da177e4SLinus Torvalds int ret; 10411da177e4SLinus Torvalds 10420b728e19SAl Viro if (flags & LOOKUP_RCU) 1043a0753c29SDavid Howells return afs_d_revalidate_rcu(dentry); 104434286d66SNick Piggin 1045c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 10462b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 10473b6492dfSDavid Howells _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1048a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 1049260a9803SDavid Howells vnode->flags); 1050c435ee34SDavid Howells } else { 1051a455589fSAl Viro _enter("{neg n=%pd}", dentry); 1052c435ee34SDavid Howells } 10531da177e4SLinus Torvalds 1054260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 105500d3b7a4SDavid Howells if (IS_ERR(key)) 105600d3b7a4SDavid Howells key = NULL; 105700d3b7a4SDavid Howells 1058c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 1059c435ee34SDavid Howells inode = d_inode(dentry); 1060c435ee34SDavid Howells if (inode) { 1061c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1062c435ee34SDavid Howells afs_validate(vnode, key); 1063c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1064c435ee34SDavid Howells goto out_bad; 1065c435ee34SDavid Howells } 1066c435ee34SDavid Howells } 1067c435ee34SDavid Howells 10681da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 106908e0e7c8SDavid Howells parent = dget_parent(dentry); 10702b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 10711da177e4SLinus Torvalds 1072260a9803SDavid Howells /* validate the parent directory */ 1073260a9803SDavid Howells afs_validate(dir, key); 1074260a9803SDavid Howells 1075260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1076a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 1077c435ee34SDavid Howells goto out_bad_parent; 10781da177e4SLinus Torvalds } 10791da177e4SLinus Torvalds 1080a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1081a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1082a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1083a4ff7401SDavid Howells * version. 1084a4ff7401SDavid Howells */ 10859dd0b82eSDavid Howells dir_version = dir->status.data_version; 1086a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 10879dd0b82eSDavid Howells if (de_version == (long)dir_version) 10885dc84855SDavid Howells goto out_valid_noupdate; 1089a4ff7401SDavid Howells 109040fc8102SDavid Howells invalid_before = dir->invalid_before; 109140fc8102SDavid Howells if (de_version - (long)invalid_before >= 0) 1092a4ff7401SDavid Howells goto out_valid; 1093260a9803SDavid Howells 109408e0e7c8SDavid Howells _debug("dir modified"); 1095d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds /* search the directory for this vnode */ 10989dd0b82eSDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); 1099260a9803SDavid Howells switch (ret) { 1100260a9803SDavid Howells case 0: 1101260a9803SDavid Howells /* the filename maps to something */ 11022b0143b5SDavid Howells if (d_really_is_negative(dentry)) 1103c435ee34SDavid Howells goto out_bad_parent; 1104c435ee34SDavid Howells inode = d_inode(dentry); 1105c435ee34SDavid Howells if (is_bad_inode(inode)) { 1106a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1107a455589fSAl Viro dentry); 1108c435ee34SDavid Howells goto out_bad_parent; 11091da177e4SLinus Torvalds } 11101da177e4SLinus Torvalds 1111c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1112c435ee34SDavid Howells 11131da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 11141da177e4SLinus Torvalds * different file */ 111508e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 11163b6492dfSDavid Howells _debug("%pd: dirent changed [%llu != %llu]", 1117a455589fSAl Viro dentry, fid.vnode, 111808e0e7c8SDavid Howells vnode->fid.vnode); 11191da177e4SLinus Torvalds goto not_found; 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1123260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1124260a9803SDavid Howells * been reused */ 112508e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1126a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1127a455589fSAl Viro dentry, fid.unique, 11287a224228SJean Noel Cordenner vnode->fid.unique, 1129c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1130c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 113108e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1132c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1133260a9803SDavid Howells goto not_found; 1134260a9803SDavid Howells } 1135260a9803SDavid Howells goto out_valid; 1136260a9803SDavid Howells 1137260a9803SDavid Howells case -ENOENT: 1138260a9803SDavid Howells /* the filename is unknown */ 1139a455589fSAl Viro _debug("%pd: dirent not found", dentry); 11402b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1141260a9803SDavid Howells goto not_found; 1142260a9803SDavid Howells goto out_valid; 1143260a9803SDavid Howells 1144260a9803SDavid Howells default: 1145a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1146a455589fSAl Viro parent, ret); 1147c435ee34SDavid Howells goto out_bad_parent; 11481da177e4SLinus Torvalds } 114908e0e7c8SDavid Howells 11501da177e4SLinus Torvalds out_valid: 11519dd0b82eSDavid Howells dentry->d_fsdata = (void *)(unsigned long)dir_version; 11525dc84855SDavid Howells out_valid_noupdate: 11531da177e4SLinus Torvalds dput(parent); 115400d3b7a4SDavid Howells key_put(key); 11551da177e4SLinus Torvalds _leave(" = 1 [valid]"); 11561da177e4SLinus Torvalds return 1; 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 11591da177e4SLinus Torvalds not_found: 11601da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 11611da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 11621da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 11631da177e4SLinus Torvalds 1164c435ee34SDavid Howells out_bad_parent: 1165a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 11661da177e4SLinus Torvalds dput(parent); 1167c435ee34SDavid Howells out_bad: 116800d3b7a4SDavid Howells key_put(key); 11691da177e4SLinus Torvalds 11701da177e4SLinus Torvalds _leave(" = 0 [bad]"); 11711da177e4SLinus Torvalds return 0; 1172ec26815aSDavid Howells } 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds /* 11751da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 11761da177e4SLinus Torvalds * sleep) 11771da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 11781da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 11791da177e4SLinus Torvalds */ 1180fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 11811da177e4SLinus Torvalds { 1182a455589fSAl Viro _enter("%pd", dentry); 11831da177e4SLinus Torvalds 11841da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 11851da177e4SLinus Torvalds goto zap; 11861da177e4SLinus Torvalds 11872b0143b5SDavid Howells if (d_really_is_positive(dentry) && 11882b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 11892b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 11901da177e4SLinus Torvalds goto zap; 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds _leave(" = 0 [keep]"); 11931da177e4SLinus Torvalds return 0; 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds zap: 11961da177e4SLinus Torvalds _leave(" = 1 [zap]"); 11971da177e4SLinus Torvalds return 1; 1198ec26815aSDavid Howells } 1199260a9803SDavid Howells 1200260a9803SDavid Howells /* 120179ddbfa5SDavid Howells * Clean up sillyrename files on dentry removal. 120279ddbfa5SDavid Howells */ 120379ddbfa5SDavid Howells static void afs_d_iput(struct dentry *dentry, struct inode *inode) 120479ddbfa5SDavid Howells { 120579ddbfa5SDavid Howells if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 120679ddbfa5SDavid Howells afs_silly_iput(dentry, inode); 120779ddbfa5SDavid Howells iput(inode); 120879ddbfa5SDavid Howells } 120979ddbfa5SDavid Howells 121079ddbfa5SDavid Howells /* 1211260a9803SDavid Howells * handle dentry release 1212260a9803SDavid Howells */ 121366c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1214260a9803SDavid Howells { 1215a455589fSAl Viro _enter("%pd", dentry); 1216260a9803SDavid Howells } 1217260a9803SDavid Howells 1218260a9803SDavid Howells /* 1219d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1220d2ddc776SDavid Howells */ 1221e49c7b2fSDavid Howells static void afs_vnode_new_inode(struct afs_operation *op) 1222d2ddc776SDavid Howells { 1223e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 12245a813276SDavid Howells struct afs_vnode *vnode; 1225d2ddc776SDavid Howells struct inode *inode; 1226d2ddc776SDavid Howells 1227e49c7b2fSDavid Howells _enter(""); 1228d2ddc776SDavid Howells 1229e49c7b2fSDavid Howells ASSERTCMP(op->error, ==, 0); 1230e49c7b2fSDavid Howells 1231e49c7b2fSDavid Howells inode = afs_iget(op, vp); 1232d2ddc776SDavid Howells if (IS_ERR(inode)) { 1233d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1234d2ddc776SDavid Howells * the new directory on the server. 1235d2ddc776SDavid Howells */ 1236e49c7b2fSDavid Howells op->error = PTR_ERR(inode); 1237d2ddc776SDavid Howells return; 1238d2ddc776SDavid Howells } 1239d2ddc776SDavid Howells 12405a813276SDavid Howells vnode = AFS_FS_I(inode); 12415a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1242e49c7b2fSDavid Howells if (!op->error) 1243e49c7b2fSDavid Howells afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); 1244e49c7b2fSDavid Howells d_instantiate(op->dentry, inode); 1245d2ddc776SDavid Howells } 1246d2ddc776SDavid Howells 1247e49c7b2fSDavid Howells static void afs_create_success(struct afs_operation *op) 1248b8359153SDavid Howells { 1249e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1250e49c7b2fSDavid Howells afs_check_for_remote_deletion(op, op->file[0].vnode); 1251e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1252e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1253e49c7b2fSDavid Howells afs_vnode_new_inode(op); 1254b8359153SDavid Howells } 1255b8359153SDavid Howells 1256e49c7b2fSDavid Howells static void afs_create_edit_dir(struct afs_operation *op) 12579dd0b82eSDavid Howells { 1258e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1259e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1260e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1261e49c7b2fSDavid Howells 1262e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1263e49c7b2fSDavid Howells 1264e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1265e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1266e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1267e49c7b2fSDavid Howells afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, 1268e49c7b2fSDavid Howells op->create.reason); 1269e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 12709dd0b82eSDavid Howells } 12719dd0b82eSDavid Howells 1272e49c7b2fSDavid Howells static void afs_create_put(struct afs_operation *op) 1273e49c7b2fSDavid Howells { 1274e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1275e49c7b2fSDavid Howells 1276e49c7b2fSDavid Howells if (op->error) 1277e49c7b2fSDavid Howells d_drop(op->dentry); 1278e49c7b2fSDavid Howells } 1279e49c7b2fSDavid Howells 1280e49c7b2fSDavid Howells static const struct afs_operation_ops afs_mkdir_operation = { 1281e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_make_dir, 1282e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_make_dir, 1283e49c7b2fSDavid Howells .success = afs_create_success, 1284e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1285e49c7b2fSDavid Howells .put = afs_create_put, 1286e49c7b2fSDavid Howells }; 1287e49c7b2fSDavid Howells 12889dd0b82eSDavid Howells /* 1289260a9803SDavid Howells * create a directory on an AFS filesystem 1290260a9803SDavid Howells */ 129118bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1292260a9803SDavid Howells { 1293e49c7b2fSDavid Howells struct afs_operation *op; 1294d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1295260a9803SDavid Howells 12963b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1297a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1298260a9803SDavid Howells 1299e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1300e49c7b2fSDavid Howells if (IS_ERR(op)) { 1301260a9803SDavid Howells d_drop(dentry); 1302e49c7b2fSDavid Howells return PTR_ERR(op); 1303e49c7b2fSDavid Howells } 1304e49c7b2fSDavid Howells 1305e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1306e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1307e49c7b2fSDavid Howells op->dentry = dentry; 1308e49c7b2fSDavid Howells op->create.mode = S_IFDIR | mode; 1309e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_mkdir; 1310e49c7b2fSDavid Howells op->ops = &afs_mkdir_operation; 1311e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1312260a9803SDavid Howells } 1313260a9803SDavid Howells 1314260a9803SDavid Howells /* 1315d2ddc776SDavid Howells * Remove a subdir from a directory. 1316260a9803SDavid Howells */ 1317d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1318260a9803SDavid Howells { 13192b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1320d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1321d2ddc776SDavid Howells 1322260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1323260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1324c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 132563a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1326260a9803SDavid Howells } 1327260a9803SDavid Howells } 1328260a9803SDavid Howells 1329e49c7b2fSDavid Howells static void afs_rmdir_success(struct afs_operation *op) 1330e49c7b2fSDavid Howells { 1331e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1332e49c7b2fSDavid Howells afs_check_for_remote_deletion(op, op->file[0].vnode); 1333e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1334e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1335e49c7b2fSDavid Howells } 1336e49c7b2fSDavid Howells 1337e49c7b2fSDavid Howells static void afs_rmdir_edit_dir(struct afs_operation *op) 1338e49c7b2fSDavid Howells { 1339e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1340e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1341e49c7b2fSDavid Howells 1342e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1343e49c7b2fSDavid Howells afs_dir_remove_subdir(op->dentry); 1344e49c7b2fSDavid Howells 1345e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1346e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1347e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1348e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1349e49c7b2fSDavid Howells afs_edit_dir_for_rmdir); 1350e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1351e49c7b2fSDavid Howells } 1352e49c7b2fSDavid Howells 1353e49c7b2fSDavid Howells static void afs_rmdir_put(struct afs_operation *op) 1354e49c7b2fSDavid Howells { 1355e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1356e49c7b2fSDavid Howells if (op->file[1].vnode) 1357e49c7b2fSDavid Howells up_write(&op->file[1].vnode->rmdir_lock); 1358e49c7b2fSDavid Howells } 1359e49c7b2fSDavid Howells 1360e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rmdir_operation = { 1361e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_dir, 1362e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_dir, 1363e49c7b2fSDavid Howells .success = afs_rmdir_success, 1364e49c7b2fSDavid Howells .edit_dir = afs_rmdir_edit_dir, 1365e49c7b2fSDavid Howells .put = afs_rmdir_put, 1366e49c7b2fSDavid Howells }; 1367e49c7b2fSDavid Howells 1368260a9803SDavid Howells /* 1369d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1370260a9803SDavid Howells */ 1371d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1372260a9803SDavid Howells { 1373e49c7b2fSDavid Howells struct afs_operation *op; 1374f58db83fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1375260a9803SDavid Howells int ret; 1376260a9803SDavid Howells 13773b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1378a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1379260a9803SDavid Howells 1380e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1381e49c7b2fSDavid Howells if (IS_ERR(op)) 1382e49c7b2fSDavid Howells return PTR_ERR(op); 1383a58823acSDavid Howells 1384e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1385e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1386e49c7b2fSDavid Howells 1387e49c7b2fSDavid Howells op->dentry = dentry; 1388e49c7b2fSDavid Howells op->ops = &afs_rmdir_operation; 1389260a9803SDavid Howells 1390f58db83fSDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1391f58db83fSDavid Howells if (d_really_is_positive(dentry)) { 1392f58db83fSDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1393e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1394f58db83fSDavid Howells if (ret < 0) 1395e49c7b2fSDavid Howells goto error; 1396f58db83fSDavid Howells } 1397f58db83fSDavid Howells 139879ddbfa5SDavid Howells if (vnode) { 139979ddbfa5SDavid Howells ret = down_write_killable(&vnode->rmdir_lock); 140079ddbfa5SDavid Howells if (ret < 0) 1401e49c7b2fSDavid Howells goto error; 1402e49c7b2fSDavid Howells op->file[1].vnode = vnode; 140379ddbfa5SDavid Howells } 140479ddbfa5SDavid Howells 1405e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1406a58823acSDavid Howells 1407d2ddc776SDavid Howells error: 1408e49c7b2fSDavid Howells return afs_put_operation(op); 1409d2ddc776SDavid Howells } 1410260a9803SDavid Howells 1411d2ddc776SDavid Howells /* 1412d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1413d2ddc776SDavid Howells * 1414d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1415d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1416d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1417d2ddc776SDavid Howells * 1418d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1419d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1420d2ddc776SDavid Howells */ 1421e49c7b2fSDavid Howells static void afs_dir_remove_link(struct afs_operation *op) 1422d2ddc776SDavid Howells { 1423e49c7b2fSDavid Howells struct afs_vnode *dvnode = op->file[0].vnode; 1424e49c7b2fSDavid Howells struct afs_vnode *vnode = op->file[1].vnode; 1425e49c7b2fSDavid Howells struct dentry *dentry = op->dentry; 1426e49c7b2fSDavid Howells int ret; 1427d2ddc776SDavid Howells 1428e49c7b2fSDavid Howells if (op->error != 0 || 1429e49c7b2fSDavid Howells (op->file[1].scb.have_status && op->file[1].scb.have_error)) 1430e49c7b2fSDavid Howells return; 1431e49c7b2fSDavid Howells if (d_really_is_positive(dentry)) 1432e49c7b2fSDavid Howells return; 1433d2ddc776SDavid Howells 143430062bd1SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 143530062bd1SDavid Howells /* Already done */ 1436a38a7558SDavid Howells } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1437a38a7558SDavid Howells write_seqlock(&vnode->cb_lock); 1438440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1439440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1440440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1441051d2525SDavid Howells __afs_break_callback(vnode, afs_cb_break_for_unlink); 1442440fbc3aSDavid Howells } 1443a38a7558SDavid Howells write_sequnlock(&vnode->cb_lock); 1444440fbc3aSDavid Howells } else { 1445051d2525SDavid Howells afs_break_callback(vnode, afs_cb_break_for_unlink); 1446440fbc3aSDavid Howells 1447d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1448e49c7b2fSDavid Howells _debug("AFS_VNODE_DELETED"); 1449d2ddc776SDavid Howells 1450e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1451e49c7b2fSDavid Howells if (ret != -ESTALE) 1452e49c7b2fSDavid Howells op->error = ret; 1453d2ddc776SDavid Howells } 1454d2ddc776SDavid Howells 1455e49c7b2fSDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error); 1456d2ddc776SDavid Howells } 1457d2ddc776SDavid Howells 1458e49c7b2fSDavid Howells static void afs_unlink_success(struct afs_operation *op) 1459e49c7b2fSDavid Howells { 1460e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1461e49c7b2fSDavid Howells afs_check_for_remote_deletion(op, op->file[0].vnode); 1462e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1463e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1464e49c7b2fSDavid Howells afs_update_dentry_version(op, &op->file[0], op->dentry); 1465e49c7b2fSDavid Howells afs_dir_remove_link(op); 1466e49c7b2fSDavid Howells } 1467e49c7b2fSDavid Howells 1468e49c7b2fSDavid Howells static void afs_unlink_edit_dir(struct afs_operation *op) 1469e49c7b2fSDavid Howells { 1470e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1471e49c7b2fSDavid Howells struct afs_vnode *dvnode = dvp->vnode; 1472e49c7b2fSDavid Howells 1473e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1474e49c7b2fSDavid Howells down_write(&dvnode->validate_lock); 1475e49c7b2fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1476e49c7b2fSDavid Howells dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1477e49c7b2fSDavid Howells afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1478e49c7b2fSDavid Howells afs_edit_dir_for_unlink); 1479e49c7b2fSDavid Howells up_write(&dvnode->validate_lock); 1480e49c7b2fSDavid Howells } 1481e49c7b2fSDavid Howells 1482e49c7b2fSDavid Howells static void afs_unlink_put(struct afs_operation *op) 1483e49c7b2fSDavid Howells { 1484e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1485e49c7b2fSDavid Howells if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) 1486e49c7b2fSDavid Howells d_rehash(op->dentry); 1487e49c7b2fSDavid Howells } 1488e49c7b2fSDavid Howells 1489e49c7b2fSDavid Howells static const struct afs_operation_ops afs_unlink_operation = { 1490e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_remove_file, 1491e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_remove_file, 1492e49c7b2fSDavid Howells .success = afs_unlink_success, 1493e49c7b2fSDavid Howells .edit_dir = afs_unlink_edit_dir, 1494e49c7b2fSDavid Howells .put = afs_unlink_put, 1495e49c7b2fSDavid Howells }; 1496e49c7b2fSDavid Howells 1497d2ddc776SDavid Howells /* 1498d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1499d2ddc776SDavid Howells */ 1500d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1501d2ddc776SDavid Howells { 1502e49c7b2fSDavid Howells struct afs_operation *op; 1503fa59f52fSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1504fa59f52fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1505d2ddc776SDavid Howells int ret; 1506d2ddc776SDavid Howells 15073b6492dfSDavid Howells _enter("{%llx:%llu},{%pd}", 1508d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1509d2ddc776SDavid Howells 1510d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1511d2ddc776SDavid Howells return -ENAMETOOLONG; 1512d2ddc776SDavid Howells 1513e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1514e49c7b2fSDavid Howells if (IS_ERR(op)) 1515e49c7b2fSDavid Howells return PTR_ERR(op); 1516a58823acSDavid Howells 1517e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1518e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1519d2ddc776SDavid Howells 1520d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1521e49c7b2fSDavid Howells ret = afs_validate(vnode, op->key); 1522e49c7b2fSDavid Howells if (ret < 0) { 1523e49c7b2fSDavid Howells op->error = ret; 1524e49c7b2fSDavid Howells goto error; 1525e49c7b2fSDavid Howells } 1526d2ddc776SDavid Howells 152779ddbfa5SDavid Howells spin_lock(&dentry->d_lock); 1528fa59f52fSDavid Howells if (d_count(dentry) > 1) { 152979ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 153079ddbfa5SDavid Howells /* Start asynchronous writeout of the inode */ 153179ddbfa5SDavid Howells write_inode_now(d_inode(dentry), 0); 1532e49c7b2fSDavid Howells op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); 1533e49c7b2fSDavid Howells goto error; 153479ddbfa5SDavid Howells } 153579ddbfa5SDavid Howells if (!d_unhashed(dentry)) { 153679ddbfa5SDavid Howells /* Prevent a race with RCU lookup. */ 153779ddbfa5SDavid Howells __d_drop(dentry); 1538e49c7b2fSDavid Howells op->unlink.need_rehash = true; 153979ddbfa5SDavid Howells } 154079ddbfa5SDavid Howells spin_unlock(&dentry->d_lock); 154179ddbfa5SDavid Howells 1542e49c7b2fSDavid Howells op->file[1].vnode = vnode; 1543e49c7b2fSDavid Howells op->dentry = dentry; 1544e49c7b2fSDavid Howells op->ops = &afs_unlink_operation; 1545e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1546a58823acSDavid Howells 1547260a9803SDavid Howells error: 1548e49c7b2fSDavid Howells return afs_put_operation(op); 1549260a9803SDavid Howells } 1550260a9803SDavid Howells 1551e49c7b2fSDavid Howells static const struct afs_operation_ops afs_create_operation = { 1552e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_create_file, 1553e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_create_file, 1554e49c7b2fSDavid Howells .success = afs_create_success, 1555e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1556e49c7b2fSDavid Howells .put = afs_create_put, 1557e49c7b2fSDavid Howells }; 1558e49c7b2fSDavid Howells 1559260a9803SDavid Howells /* 1560260a9803SDavid Howells * create a regular file on an AFS filesystem 1561260a9803SDavid Howells */ 15624acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1563ebfc3b49SAl Viro bool excl) 1564260a9803SDavid Howells { 1565e49c7b2fSDavid Howells struct afs_operation *op; 156643dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1567e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1568260a9803SDavid Howells 1569e49c7b2fSDavid Howells _enter("{%llx:%llu},{%pd},%ho", 1570a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1571260a9803SDavid Howells 1572d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1573d2ddc776SDavid Howells goto error; 1574d2ddc776SDavid Howells 1575e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1576e49c7b2fSDavid Howells if (IS_ERR(op)) { 1577e49c7b2fSDavid Howells ret = PTR_ERR(op); 1578260a9803SDavid Howells goto error; 1579260a9803SDavid Howells } 1580260a9803SDavid Howells 1581e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1582e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1583a58823acSDavid Howells 1584e49c7b2fSDavid Howells op->dentry = dentry; 1585e49c7b2fSDavid Howells op->create.mode = S_IFREG | mode; 1586e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_create; 1587e49c7b2fSDavid Howells op->ops = &afs_create_operation; 1588e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1589a58823acSDavid Howells 1590260a9803SDavid Howells error: 1591260a9803SDavid Howells d_drop(dentry); 1592260a9803SDavid Howells _leave(" = %d", ret); 1593260a9803SDavid Howells return ret; 1594260a9803SDavid Howells } 1595260a9803SDavid Howells 1596e49c7b2fSDavid Howells static void afs_link_success(struct afs_operation *op) 1597e49c7b2fSDavid Howells { 1598e49c7b2fSDavid Howells struct afs_vnode_param *dvp = &op->file[0]; 1599e49c7b2fSDavid Howells struct afs_vnode_param *vp = &op->file[1]; 1600e49c7b2fSDavid Howells 1601e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1602e49c7b2fSDavid Howells afs_vnode_commit_status(op, dvp); 1603e49c7b2fSDavid Howells afs_vnode_commit_status(op, vp); 1604e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry); 1605e49c7b2fSDavid Howells if (op->dentry_2->d_parent == op->dentry->d_parent) 1606e49c7b2fSDavid Howells afs_update_dentry_version(op, dvp, op->dentry_2); 1607e49c7b2fSDavid Howells ihold(&vp->vnode->vfs_inode); 1608e49c7b2fSDavid Howells d_instantiate(op->dentry, &vp->vnode->vfs_inode); 1609e49c7b2fSDavid Howells } 1610e49c7b2fSDavid Howells 1611e49c7b2fSDavid Howells static void afs_link_put(struct afs_operation *op) 1612e49c7b2fSDavid Howells { 1613e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1614e49c7b2fSDavid Howells if (op->error) 1615e49c7b2fSDavid Howells d_drop(op->dentry); 1616e49c7b2fSDavid Howells } 1617e49c7b2fSDavid Howells 1618e49c7b2fSDavid Howells static const struct afs_operation_ops afs_link_operation = { 1619e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_link, 1620e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_link, 1621e49c7b2fSDavid Howells .success = afs_link_success, 1622e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1623e49c7b2fSDavid Howells .put = afs_link_put, 1624e49c7b2fSDavid Howells }; 1625e49c7b2fSDavid Howells 1626260a9803SDavid Howells /* 1627260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1628260a9803SDavid Howells */ 1629260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1630260a9803SDavid Howells struct dentry *dentry) 1631260a9803SDavid Howells { 1632e49c7b2fSDavid Howells struct afs_operation *op; 1633a58823acSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1634a58823acSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1635e49c7b2fSDavid Howells int ret = -ENAMETOOLONG; 1636260a9803SDavid Howells 16373b6492dfSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1638260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1639260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1640a455589fSAl Viro dentry); 1641260a9803SDavid Howells 1642d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1643d2ddc776SDavid Howells goto error; 1644d2ddc776SDavid Howells 1645e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1646e49c7b2fSDavid Howells if (IS_ERR(op)) { 1647e49c7b2fSDavid Howells ret = PTR_ERR(op); 1648a58823acSDavid Howells goto error; 1649260a9803SDavid Howells } 1650260a9803SDavid Howells 1651e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1652e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, vnode); 1653e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1654a58823acSDavid Howells 1655e49c7b2fSDavid Howells op->dentry = dentry; 1656e49c7b2fSDavid Howells op->dentry_2 = from; 1657e49c7b2fSDavid Howells op->ops = &afs_link_operation; 1658e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_link; 1659e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1660260a9803SDavid Howells 1661260a9803SDavid Howells error: 1662260a9803SDavid Howells d_drop(dentry); 1663260a9803SDavid Howells _leave(" = %d", ret); 1664260a9803SDavid Howells return ret; 1665260a9803SDavid Howells } 1666260a9803SDavid Howells 1667e49c7b2fSDavid Howells static const struct afs_operation_ops afs_symlink_operation = { 1668e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_symlink, 1669e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_symlink, 1670e49c7b2fSDavid Howells .success = afs_create_success, 1671e49c7b2fSDavid Howells .edit_dir = afs_create_edit_dir, 1672e49c7b2fSDavid Howells .put = afs_create_put, 1673e49c7b2fSDavid Howells }; 1674e49c7b2fSDavid Howells 1675260a9803SDavid Howells /* 1676260a9803SDavid Howells * create a symlink in an AFS filesystem 1677260a9803SDavid Howells */ 1678260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1679260a9803SDavid Howells const char *content) 1680260a9803SDavid Howells { 1681e49c7b2fSDavid Howells struct afs_operation *op; 1682d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1683260a9803SDavid Howells int ret; 1684260a9803SDavid Howells 16853b6492dfSDavid Howells _enter("{%llx:%llu},{%pd},%s", 1686a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1687260a9803SDavid Howells content); 1688260a9803SDavid Howells 1689d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1690d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1691d2ddc776SDavid Howells goto error; 1692d2ddc776SDavid Howells 1693260a9803SDavid Howells ret = -EINVAL; 169445222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1695260a9803SDavid Howells goto error; 1696260a9803SDavid Howells 1697e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, dvnode->volume); 1698e49c7b2fSDavid Howells if (IS_ERR(op)) { 1699e49c7b2fSDavid Howells ret = PTR_ERR(op); 1700a58823acSDavid Howells goto error; 1701260a9803SDavid Howells } 1702260a9803SDavid Howells 1703e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, dvnode); 1704e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1705a58823acSDavid Howells 1706e49c7b2fSDavid Howells op->dentry = dentry; 1707e49c7b2fSDavid Howells op->ops = &afs_symlink_operation; 1708e49c7b2fSDavid Howells op->create.reason = afs_edit_dir_for_symlink; 1709e49c7b2fSDavid Howells op->create.symlink = content; 1710e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1711d2ddc776SDavid Howells 1712260a9803SDavid Howells error: 1713260a9803SDavid Howells d_drop(dentry); 1714260a9803SDavid Howells _leave(" = %d", ret); 1715260a9803SDavid Howells return ret; 1716260a9803SDavid Howells } 1717260a9803SDavid Howells 1718e49c7b2fSDavid Howells static void afs_rename_success(struct afs_operation *op) 1719260a9803SDavid Howells { 1720e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1721e49c7b2fSDavid Howells 1722e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[0]); 1723e49c7b2fSDavid Howells if (op->file[1].vnode != op->file[0].vnode) 1724e49c7b2fSDavid Howells afs_vnode_commit_status(op, &op->file[1]); 1725e49c7b2fSDavid Howells } 1726e49c7b2fSDavid Howells 1727e49c7b2fSDavid Howells static void afs_rename_edit_dir(struct afs_operation *op) 1728e49c7b2fSDavid Howells { 1729e49c7b2fSDavid Howells struct afs_vnode_param *orig_dvp = &op->file[0]; 1730e49c7b2fSDavid Howells struct afs_vnode_param *new_dvp = &op->file[1]; 1731e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode = orig_dvp->vnode; 1732e49c7b2fSDavid Howells struct afs_vnode *new_dvnode = new_dvp->vnode; 1733e49c7b2fSDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); 1734e49c7b2fSDavid Howells struct dentry *old_dentry = op->dentry; 1735e49c7b2fSDavid Howells struct dentry *new_dentry = op->dentry_2; 173679ddbfa5SDavid Howells struct inode *new_inode; 1737260a9803SDavid Howells 1738e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 17391cd66c93SMiklos Szeredi 1740e49c7b2fSDavid Howells if (op->rename.rehash) { 1741e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1742e49c7b2fSDavid Howells op->rename.rehash = NULL; 1743260a9803SDavid Howells } 1744260a9803SDavid Howells 17452105c282SDavid Howells down_write(&orig_dvnode->validate_lock); 17462105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && 1747e49c7b2fSDavid Howells orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) 174863a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 174979ddbfa5SDavid Howells afs_edit_dir_for_rename_0); 175063a4681fSDavid Howells 1751e49c7b2fSDavid Howells if (new_dvnode != orig_dvnode) { 1752e49c7b2fSDavid Howells up_write(&orig_dvnode->validate_lock); 17532105c282SDavid Howells down_write(&new_dvnode->validate_lock); 17542105c282SDavid Howells } 1755e49c7b2fSDavid Howells 17562105c282SDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && 1757e49c7b2fSDavid Howells new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { 1758e49c7b2fSDavid Howells if (!op->rename.new_negative) 175963a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 176079ddbfa5SDavid Howells afs_edit_dir_for_rename_1); 176163a4681fSDavid Howells 176263a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 176379ddbfa5SDavid Howells &vnode->fid, afs_edit_dir_for_rename_2); 17642105c282SDavid Howells } 176579ddbfa5SDavid Howells 176679ddbfa5SDavid Howells new_inode = d_inode(new_dentry); 176779ddbfa5SDavid Howells if (new_inode) { 176879ddbfa5SDavid Howells spin_lock(&new_inode->i_lock); 176979ddbfa5SDavid Howells if (new_inode->i_nlink > 0) 177079ddbfa5SDavid Howells drop_nlink(new_inode); 177179ddbfa5SDavid Howells spin_unlock(&new_inode->i_lock); 177279ddbfa5SDavid Howells } 17739dd0b82eSDavid Howells 17749dd0b82eSDavid Howells /* Now we can update d_fsdata on the dentries to reflect their 17759dd0b82eSDavid Howells * new parent's data_version. 17769dd0b82eSDavid Howells * 17779dd0b82eSDavid Howells * Note that if we ever implement RENAME_EXCHANGE, we'll have 17789dd0b82eSDavid Howells * to update both dentries with opposing dir versions. 17799dd0b82eSDavid Howells */ 1780e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry); 1781e49c7b2fSDavid Howells afs_update_dentry_version(op, new_dvp, op->dentry_2); 1782e49c7b2fSDavid Howells 178379ddbfa5SDavid Howells d_move(old_dentry, new_dentry); 1784e49c7b2fSDavid Howells 17852105c282SDavid Howells up_write(&new_dvnode->validate_lock); 178663a4681fSDavid Howells } 178763a4681fSDavid Howells 1788e49c7b2fSDavid Howells static void afs_rename_put(struct afs_operation *op) 1789e49c7b2fSDavid Howells { 1790e49c7b2fSDavid Howells _enter("op=%08x", op->debug_id); 1791e49c7b2fSDavid Howells if (op->rename.rehash) 1792e49c7b2fSDavid Howells d_rehash(op->rename.rehash); 1793e49c7b2fSDavid Howells dput(op->rename.tmp); 1794e49c7b2fSDavid Howells if (op->error) 1795e49c7b2fSDavid Howells d_rehash(op->dentry); 1796e49c7b2fSDavid Howells } 1797e49c7b2fSDavid Howells 1798e49c7b2fSDavid Howells static const struct afs_operation_ops afs_rename_operation = { 1799e49c7b2fSDavid Howells .issue_afs_rpc = afs_fs_rename, 1800e49c7b2fSDavid Howells .issue_yfs_rpc = yfs_fs_rename, 1801e49c7b2fSDavid Howells .success = afs_rename_success, 1802e49c7b2fSDavid Howells .edit_dir = afs_rename_edit_dir, 1803e49c7b2fSDavid Howells .put = afs_rename_put, 1804e49c7b2fSDavid Howells }; 1805e49c7b2fSDavid Howells 1806e49c7b2fSDavid Howells /* 1807e49c7b2fSDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1808e49c7b2fSDavid Howells */ 1809e49c7b2fSDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1810e49c7b2fSDavid Howells struct inode *new_dir, struct dentry *new_dentry, 1811e49c7b2fSDavid Howells unsigned int flags) 1812e49c7b2fSDavid Howells { 1813e49c7b2fSDavid Howells struct afs_operation *op; 1814e49c7b2fSDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1815e49c7b2fSDavid Howells int ret; 1816e49c7b2fSDavid Howells 1817e49c7b2fSDavid Howells if (flags) 1818e49c7b2fSDavid Howells return -EINVAL; 1819e49c7b2fSDavid Howells 1820e49c7b2fSDavid Howells /* Don't allow silly-rename files be moved around. */ 1821e49c7b2fSDavid Howells if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 1822e49c7b2fSDavid Howells return -EINVAL; 1823e49c7b2fSDavid Howells 1824e49c7b2fSDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1825e49c7b2fSDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1826e49c7b2fSDavid Howells new_dvnode = AFS_FS_I(new_dir); 1827e49c7b2fSDavid Howells 1828e49c7b2fSDavid Howells _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1829e49c7b2fSDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1830e49c7b2fSDavid Howells vnode->fid.vid, vnode->fid.vnode, 1831e49c7b2fSDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1832e49c7b2fSDavid Howells new_dentry); 1833e49c7b2fSDavid Howells 1834e49c7b2fSDavid Howells op = afs_alloc_operation(NULL, orig_dvnode->volume); 1835e49c7b2fSDavid Howells if (IS_ERR(op)) 1836e49c7b2fSDavid Howells return PTR_ERR(op); 1837e49c7b2fSDavid Howells 1838e49c7b2fSDavid Howells afs_op_set_vnode(op, 0, orig_dvnode); 1839e49c7b2fSDavid Howells afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ 1840e49c7b2fSDavid Howells op->file[0].dv_delta = 1; 1841e49c7b2fSDavid Howells op->file[1].dv_delta = 1; 1842e49c7b2fSDavid Howells 1843e49c7b2fSDavid Howells op->dentry = old_dentry; 1844e49c7b2fSDavid Howells op->dentry_2 = new_dentry; 1845e49c7b2fSDavid Howells op->rename.new_negative = d_is_negative(new_dentry); 1846e49c7b2fSDavid Howells op->ops = &afs_rename_operation; 1847e49c7b2fSDavid Howells 1848e49c7b2fSDavid Howells /* For non-directories, check whether the target is busy and if so, 1849e49c7b2fSDavid Howells * make a copy of the dentry and then do a silly-rename. If the 1850e49c7b2fSDavid Howells * silly-rename succeeds, the copied dentry is hashed and becomes the 1851e49c7b2fSDavid Howells * new target. 1852e49c7b2fSDavid Howells */ 1853e49c7b2fSDavid Howells if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 1854e49c7b2fSDavid Howells /* To prevent any new references to the target during the 1855e49c7b2fSDavid Howells * rename, we unhash the dentry in advance. 1856e49c7b2fSDavid Howells */ 1857e49c7b2fSDavid Howells if (!d_unhashed(new_dentry)) { 1858e49c7b2fSDavid Howells d_drop(new_dentry); 1859e49c7b2fSDavid Howells op->rename.rehash = new_dentry; 1860e49c7b2fSDavid Howells } 1861e49c7b2fSDavid Howells 1862e49c7b2fSDavid Howells if (d_count(new_dentry) > 2) { 1863e49c7b2fSDavid Howells /* copy the target dentry's name */ 1864e49c7b2fSDavid Howells ret = -ENOMEM; 1865e49c7b2fSDavid Howells op->rename.tmp = d_alloc(new_dentry->d_parent, 1866e49c7b2fSDavid Howells &new_dentry->d_name); 1867e49c7b2fSDavid Howells if (!op->rename.tmp) 1868e49c7b2fSDavid Howells goto error; 1869e49c7b2fSDavid Howells 1870e49c7b2fSDavid Howells ret = afs_sillyrename(new_dvnode, 1871e49c7b2fSDavid Howells AFS_FS_I(d_inode(new_dentry)), 1872e49c7b2fSDavid Howells new_dentry, op->key); 1873e49c7b2fSDavid Howells if (ret) 1874e49c7b2fSDavid Howells goto error; 1875e49c7b2fSDavid Howells 1876e49c7b2fSDavid Howells op->dentry_2 = op->rename.tmp; 1877e49c7b2fSDavid Howells op->rename.rehash = NULL; 1878e49c7b2fSDavid Howells op->rename.new_negative = true; 1879e49c7b2fSDavid Howells } 1880e49c7b2fSDavid Howells } 1881e49c7b2fSDavid Howells 1882e49c7b2fSDavid Howells /* This bit is potentially nasty as there's a potential race with 1883e49c7b2fSDavid Howells * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 1884e49c7b2fSDavid Howells * to reflect it's new parent's new data_version after the op, but 1885e49c7b2fSDavid Howells * d_revalidate may see old_dentry between the op having taken place 1886e49c7b2fSDavid Howells * and the version being updated. 1887e49c7b2fSDavid Howells * 1888e49c7b2fSDavid Howells * So drop the old_dentry for now to make other threads go through 1889e49c7b2fSDavid Howells * lookup instead - which we hold a lock against. 1890e49c7b2fSDavid Howells */ 1891e49c7b2fSDavid Howells d_drop(old_dentry); 1892e49c7b2fSDavid Howells 1893e49c7b2fSDavid Howells return afs_do_sync_operation(op); 1894e49c7b2fSDavid Howells 1895260a9803SDavid Howells error: 1896e49c7b2fSDavid Howells return afs_put_operation(op); 1897260a9803SDavid Howells } 1898f3ddee8dSDavid Howells 1899f3ddee8dSDavid Howells /* 1900f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1901f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1902f3ddee8dSDavid Howells */ 1903f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1904f3ddee8dSDavid Howells { 1905f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1906f3ddee8dSDavid Howells 19073b6492dfSDavid Howells _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1908f3ddee8dSDavid Howells 1909f3ddee8dSDavid Howells set_page_private(page, 0); 1910f3ddee8dSDavid Howells ClearPagePrivate(page); 1911f3ddee8dSDavid Howells 1912f3ddee8dSDavid Howells /* The directory will need reloading. */ 1913f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1914f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1915f3ddee8dSDavid Howells return 1; 1916f3ddee8dSDavid Howells } 1917f3ddee8dSDavid Howells 1918f3ddee8dSDavid Howells /* 1919f3ddee8dSDavid Howells * invalidate part or all of a page 1920f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1921f3ddee8dSDavid Howells * the entire page) 1922f3ddee8dSDavid Howells */ 1923f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1924f3ddee8dSDavid Howells unsigned int length) 1925f3ddee8dSDavid Howells { 1926f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1927f3ddee8dSDavid Howells 1928f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1929f3ddee8dSDavid Howells 1930f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1931f3ddee8dSDavid Howells 1932f3ddee8dSDavid Howells /* The directory will need reloading. */ 1933f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1934f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1935f3ddee8dSDavid Howells 1936f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1937f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1938f3ddee8dSDavid Howells set_page_private(page, 0); 1939f3ddee8dSDavid Howells ClearPagePrivate(page); 1940f3ddee8dSDavid Howells } 1941f3ddee8dSDavid Howells } 1942