11da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 21da177e4SLinus Torvalds * 3f3ddee8dSDavid Howells * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/fs.h> 1434286d66SNick Piggin #include <linux/namei.h> 151da177e4SLinus Torvalds #include <linux/pagemap.h> 16f3ddee8dSDavid Howells #include <linux/swap.h> 1700d3b7a4SDavid Howells #include <linux/ctype.h> 18e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 19f3ddee8dSDavid Howells #include <linux/task_io_accounting_ops.h> 201da177e4SLinus Torvalds #include "internal.h" 211da177e4SLinus Torvalds 22260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2300cd8dd3SAl Viro unsigned int flags); 241da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 251bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 260b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 27fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 285cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 295cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 30ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 31afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 324acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 33ebfc3b49SAl Viro bool excl); 3418bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 35260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 37260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 38260a9803SDavid Howells struct dentry *dentry); 39260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 40260a9803SDavid Howells const char *content); 41260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 421cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 431cd66c93SMiklos Szeredi unsigned int flags); 44f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 45f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 46f3ddee8dSDavid Howells unsigned int length); 47f3ddee8dSDavid Howells 48f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 49f3ddee8dSDavid Howells { 50f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 51f3ddee8dSDavid Howells } 521da177e4SLinus Torvalds 534b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 541da177e4SLinus Torvalds .open = afs_dir_open, 5500d3b7a4SDavid Howells .release = afs_release, 5629884effSAl Viro .iterate_shared = afs_readdir, 57e8d6c554SDavid Howells .lock = afs_lock, 583222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 61754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 62260a9803SDavid Howells .create = afs_create, 63260a9803SDavid Howells .lookup = afs_lookup, 64260a9803SDavid Howells .link = afs_link, 65260a9803SDavid Howells .unlink = afs_unlink, 66260a9803SDavid Howells .symlink = afs_symlink, 67260a9803SDavid Howells .mkdir = afs_mkdir, 68260a9803SDavid Howells .rmdir = afs_rmdir, 692773bf00SMiklos Szeredi .rename = afs_rename, 7000d3b7a4SDavid Howells .permission = afs_permission, 71416351f2SDavid Howells .getattr = afs_getattr, 7231143d5dSDavid Howells .setattr = afs_setattr, 73d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 741da177e4SLinus Torvalds }; 751da177e4SLinus Torvalds 76f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 77f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 78f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 79f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 80f3ddee8dSDavid Howells }; 81f3ddee8dSDavid Howells 82d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 831da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 841da177e4SLinus Torvalds .d_delete = afs_d_delete, 85260a9803SDavid Howells .d_release = afs_d_release, 86d18610b0SDavid Howells .d_automount = afs_d_automount, 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 901da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 911da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds union afs_dirent { 941da177e4SLinus Torvalds struct { 951da177e4SLinus Torvalds uint8_t valid; 961da177e4SLinus Torvalds uint8_t unused[1]; 971da177e4SLinus Torvalds __be16 hash_next; 981da177e4SLinus Torvalds __be32 vnode; 991da177e4SLinus Torvalds __be32 unique; 1001da177e4SLinus Torvalds uint8_t name[16]; 1011da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 1021da177e4SLinus Torvalds * NUL) reaches here, consume 1031da177e4SLinus Torvalds * the next dirent too */ 1041da177e4SLinus Torvalds } u; 1051da177e4SLinus Torvalds uint8_t extended_name[32]; 1061da177e4SLinus Torvalds }; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 1091da177e4SLinus Torvalds struct afs_dir_pagehdr { 1101da177e4SLinus Torvalds __be16 npages; 1111da177e4SLinus Torvalds __be16 magic; 1121da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 1131da177e4SLinus Torvalds uint8_t nentries; 1141da177e4SLinus Torvalds uint8_t bitmap[8]; 1151da177e4SLinus Torvalds uint8_t pad[19]; 1161da177e4SLinus Torvalds }; 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* directory block layout */ 1191da177e4SLinus Torvalds union afs_dir_block { 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds struct { 1241da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1251da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1261da177e4SLinus Torvalds /* dir hash table */ 1271da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1281da177e4SLinus Torvalds } hdr; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1311da177e4SLinus Torvalds }; 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* layout on a linux VM page */ 1341da177e4SLinus Torvalds struct afs_dir_page { 1351da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1361da177e4SLinus Torvalds }; 1371da177e4SLinus Torvalds 1385cf9dd55SDavid Howells struct afs_lookup_one_cookie { 1395cf9dd55SDavid Howells struct dir_context ctx; 1405cf9dd55SDavid Howells struct qstr name; 1415cf9dd55SDavid Howells bool found; 1425cf9dd55SDavid Howells struct afs_fid fid; 1435cf9dd55SDavid Howells }; 1445cf9dd55SDavid Howells 145260a9803SDavid Howells struct afs_lookup_cookie { 1461bbae9f8SAl Viro struct dir_context ctx; 1471bbae9f8SAl Viro struct qstr name; 1485cf9dd55SDavid Howells bool found; 1495cf9dd55SDavid Howells bool one_only; 1505cf9dd55SDavid Howells unsigned short nr_fids; 1515cf9dd55SDavid Howells struct afs_file_status *statuses; 1525cf9dd55SDavid Howells struct afs_callback *callbacks; 1535cf9dd55SDavid Howells struct afs_fid fids[50]; 1541da177e4SLinus Torvalds }; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds /* 1571da177e4SLinus Torvalds * check that a directory page is valid 1581da177e4SLinus Torvalds */ 159f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 160f3ddee8dSDavid Howells loff_t i_size) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds struct afs_dir_page *dbuf; 163f3ddee8dSDavid Howells loff_t latter, off; 1641da177e4SLinus Torvalds int tmp, qty; 1651da177e4SLinus Torvalds 166dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 167dab17c1aSDavid Howells * we must take care because the directory may change size under us. 168dab17c1aSDavid Howells */ 169dab17c1aSDavid Howells off = page_offset(page); 170dab17c1aSDavid Howells if (i_size <= off) 171dab17c1aSDavid Howells goto checked; 172dab17c1aSDavid Howells 173dab17c1aSDavid Howells latter = i_size - off; 1741da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1751da177e4SLinus Torvalds qty = PAGE_SIZE; 1761da177e4SLinus Torvalds else 1771da177e4SLinus Torvalds qty = latter; 1781da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* check them */ 1811da177e4SLinus Torvalds dbuf = page_address(page); 1821da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1831da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 184dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 185f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 1861da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 187f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 1881da177e4SLinus Torvalds goto error; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 192dab17c1aSDavid Howells checked: 193f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 194be5b82dbSAl Viro return true; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds error: 197be5b82dbSAl Viro return false; 198ec26815aSDavid Howells } 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds /* 2011da177e4SLinus Torvalds * open an AFS directory file 2021da177e4SLinus Torvalds */ 2031da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2061da177e4SLinus Torvalds 2072ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2082ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2091da177e4SLinus Torvalds 21008e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2111da177e4SLinus Torvalds return -ENOENT; 2121da177e4SLinus Torvalds 21300d3b7a4SDavid Howells return afs_open(inode, file); 214ec26815aSDavid Howells } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* 217f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 218f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 219f3ddee8dSDavid Howells * get reclaimed during the iteration. 220f3ddee8dSDavid Howells */ 221f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 222f3ddee8dSDavid Howells { 223f3ddee8dSDavid Howells struct afs_read *req; 224f3ddee8dSDavid Howells loff_t i_size; 225f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 226f3ddee8dSDavid Howells int ret = -ENOMEM; 227f3ddee8dSDavid Howells 228f3ddee8dSDavid Howells retry: 229f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 230f3ddee8dSDavid Howells if (i_size < 2048) 231f3ddee8dSDavid Howells return ERR_PTR(-EIO); 232f3ddee8dSDavid Howells if (i_size > 2048 * 1024) 233f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 234f3ddee8dSDavid Howells 235f3ddee8dSDavid Howells _enter("%llu", i_size); 236f3ddee8dSDavid Howells 237f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 238f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 239f3ddee8dSDavid Howells */ 240f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 241f3ddee8dSDavid Howells nr_inline = nr_pages; 242f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 243f3ddee8dSDavid Howells nr_inline = 0; 244f3ddee8dSDavid Howells 245f3ddee8dSDavid Howells req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, 246f3ddee8dSDavid Howells GFP_KERNEL); 247f3ddee8dSDavid Howells if (!req) 248f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 249f3ddee8dSDavid Howells 250f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 251f3ddee8dSDavid Howells req->nr_pages = nr_pages; 252f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 253f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 254f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 255f3ddee8dSDavid Howells if (nr_inline > 0) { 256f3ddee8dSDavid Howells req->pages = req->array; 257f3ddee8dSDavid Howells } else { 258f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 259f3ddee8dSDavid Howells GFP_KERNEL); 260f3ddee8dSDavid Howells if (!req->pages) 261f3ddee8dSDavid Howells goto error; 262f3ddee8dSDavid Howells } 263f3ddee8dSDavid Howells 264f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 265f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 266f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 267f3ddee8dSDavid Howells * need to reread the entire directory contents. 268f3ddee8dSDavid Howells */ 269f3ddee8dSDavid Howells i = 0; 270f3ddee8dSDavid Howells do { 271f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 272f3ddee8dSDavid Howells req->nr_pages - i, 273f3ddee8dSDavid Howells req->pages + i); 274f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 275f3ddee8dSDavid Howells if (n == 0) { 276f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 277f3ddee8dSDavid Howells 278f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 279f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 280f3ddee8dSDavid Howells 281f3ddee8dSDavid Howells ret = -ENOMEM; 282f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 283f3ddee8dSDavid Howells if (!req->pages[i]) 284f3ddee8dSDavid Howells goto error; 285f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 286f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 287f3ddee8dSDavid Howells i, gfp); 288f3ddee8dSDavid Howells if (ret < 0) 289f3ddee8dSDavid Howells goto error; 290f3ddee8dSDavid Howells 291f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 292f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 293f3ddee8dSDavid Howells unlock_page(req->pages[i]); 294f3ddee8dSDavid Howells i++; 295f3ddee8dSDavid Howells } else { 296f3ddee8dSDavid Howells i += n; 297f3ddee8dSDavid Howells } 298f3ddee8dSDavid Howells } while (i < req->nr_pages); 299f3ddee8dSDavid Howells 300f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 301f3ddee8dSDavid Howells * races. 302f3ddee8dSDavid Howells */ 303f3ddee8dSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 304f3ddee8dSDavid Howells ret = -ERESTARTSYS; 305f3ddee8dSDavid Howells for (i = 0; i < req->nr_pages; i++) 306f3ddee8dSDavid Howells if (lock_page_killable(req->pages[i]) < 0) 307f3ddee8dSDavid Howells goto error_unlock; 308f3ddee8dSDavid Howells 309f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 310f3ddee8dSDavid Howells goto success; 311f3ddee8dSDavid Howells 312f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 313f3ddee8dSDavid Howells if (ret < 0) 314f3ddee8dSDavid Howells goto error_unlock_all; 315f3ddee8dSDavid Howells 316f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 317f3ddee8dSDavid Howells 318f3ddee8dSDavid Howells if (req->len < req->file_size) 319f3ddee8dSDavid Howells goto content_has_grown; 320f3ddee8dSDavid Howells 321f3ddee8dSDavid Howells /* Validate the data we just read. */ 322f3ddee8dSDavid Howells ret = -EIO; 323f3ddee8dSDavid Howells for (i = 0; i < req->nr_pages; i++) 324f3ddee8dSDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], 325f3ddee8dSDavid Howells req->actual_len)) 326f3ddee8dSDavid Howells goto error_unlock_all; 327f3ddee8dSDavid Howells 328f3ddee8dSDavid Howells // TODO: Trim excess pages 329f3ddee8dSDavid Howells 330f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 331f3ddee8dSDavid Howells } 332f3ddee8dSDavid Howells 333f3ddee8dSDavid Howells success: 334f3ddee8dSDavid Howells i = req->nr_pages; 335f3ddee8dSDavid Howells while (i > 0) 336f3ddee8dSDavid Howells unlock_page(req->pages[--i]); 337f3ddee8dSDavid Howells return req; 338f3ddee8dSDavid Howells 339f3ddee8dSDavid Howells error_unlock_all: 340f3ddee8dSDavid Howells i = req->nr_pages; 341f3ddee8dSDavid Howells error_unlock: 342f3ddee8dSDavid Howells while (i > 0) 343f3ddee8dSDavid Howells unlock_page(req->pages[--i]); 344f3ddee8dSDavid Howells error: 345f3ddee8dSDavid Howells afs_put_read(req); 346f3ddee8dSDavid Howells _leave(" = %d", ret); 347f3ddee8dSDavid Howells return ERR_PTR(ret); 348f3ddee8dSDavid Howells 349f3ddee8dSDavid Howells content_has_grown: 350f3ddee8dSDavid Howells i = req->nr_pages; 351f3ddee8dSDavid Howells while (i > 0) 352f3ddee8dSDavid Howells unlock_page(req->pages[--i]); 353f3ddee8dSDavid Howells afs_put_read(req); 354f3ddee8dSDavid Howells goto retry; 355f3ddee8dSDavid Howells } 356f3ddee8dSDavid Howells 357f3ddee8dSDavid Howells /* 3581da177e4SLinus Torvalds * deal with one block in an AFS directory 3591da177e4SLinus Torvalds */ 3601bbae9f8SAl Viro static int afs_dir_iterate_block(struct dir_context *ctx, 3611da177e4SLinus Torvalds union afs_dir_block *block, 3621bbae9f8SAl Viro unsigned blkoff) 3631da177e4SLinus Torvalds { 3641da177e4SLinus Torvalds union afs_dirent *dire; 3651da177e4SLinus Torvalds unsigned offset, next, curr; 3661da177e4SLinus Torvalds size_t nlen; 3671bbae9f8SAl Viro int tmp; 3681da177e4SLinus Torvalds 3691bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3701da177e4SLinus Torvalds 3711bbae9f8SAl Viro curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3741da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 3751da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 3761da177e4SLinus Torvalds offset = next 3771da177e4SLinus Torvalds ) { 3781da177e4SLinus Torvalds next = offset + 1; 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 3811da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 3821da177e4SLinus Torvalds (1 << (offset % 8)))) { 3835b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 3841da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 3851da177e4SLinus Torvalds if (offset >= curr) 3861bbae9f8SAl Viro ctx->pos = blkoff + 3871da177e4SLinus Torvalds next * sizeof(union afs_dirent); 3881da177e4SLinus Torvalds continue; 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* got a valid entry */ 3921da177e4SLinus Torvalds dire = &block->dirents[offset]; 3931da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3941da177e4SLinus Torvalds sizeof(*block) - 3951da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 3961da177e4SLinus Torvalds 3975b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 3981da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 3991da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 4001da177e4SLinus Torvalds nlen, dire->u.name); 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* work out where the next possible entry is */ 4031da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 4041da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 4055b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4061da177e4SLinus Torvalds " %u travelled beyond end dir block" 4075b5e0928SAlexey Dobriyan " (len %u/%zu)", 4081da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 4091da177e4SLinus Torvalds offset, next, tmp, nlen); 4101da177e4SLinus Torvalds return -EIO; 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 4131da177e4SLinus Torvalds (1 << (next % 8)))) { 4145b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 4155b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 4161da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 4171da177e4SLinus Torvalds offset, next, tmp, nlen); 4181da177e4SLinus Torvalds return -EIO; 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds 4215b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 4221da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 4231da177e4SLinus Torvalds next, tmp, nlen); 4241da177e4SLinus Torvalds next++; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds /* skip if starts before the current position */ 4281da177e4SLinus Torvalds if (offset < curr) 4291da177e4SLinus Torvalds continue; 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* found the next entry */ 4321bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 4331da177e4SLinus Torvalds ntohl(dire->u.vnode), 4345cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 4355cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 4361bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 4371da177e4SLinus Torvalds _leave(" = 0 [full]"); 4381da177e4SLinus Torvalds return 0; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411bbae9f8SAl Viro ctx->pos = blkoff + next * sizeof(union afs_dirent); 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds _leave(" = 1 [more]"); 4451da177e4SLinus Torvalds return 1; 446ec26815aSDavid Howells } 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds /* 44908e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4501da177e4SLinus Torvalds */ 4511bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4521bbae9f8SAl Viro struct key *key) 4531da177e4SLinus Torvalds { 454f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 4551da177e4SLinus Torvalds union afs_dir_block *dblock; 4561da177e4SLinus Torvalds struct afs_dir_page *dbuf; 457f3ddee8dSDavid Howells struct afs_read *req; 4581da177e4SLinus Torvalds struct page *page; 4591da177e4SLinus Torvalds unsigned blkoff, limit; 4601da177e4SLinus Torvalds int ret; 4611da177e4SLinus Torvalds 4621bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4631da177e4SLinus Torvalds 46408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4651da177e4SLinus Torvalds _leave(" = -ESTALE"); 4661da177e4SLinus Torvalds return -ESTALE; 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 469f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 470f3ddee8dSDavid Howells if (IS_ERR(req)) 471f3ddee8dSDavid Howells return PTR_ERR(req); 472f3ddee8dSDavid Howells 4731da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 4741bbae9f8SAl Viro ctx->pos += sizeof(union afs_dirent) - 1; 4751bbae9f8SAl Viro ctx->pos &= ~(sizeof(union afs_dirent) - 1); 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4781da177e4SLinus Torvalds ret = 0; 479f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 4801bbae9f8SAl Viro blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); 4811da177e4SLinus Torvalds 482f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 483f3ddee8dSDavid Howells * to the LRU. 484f3ddee8dSDavid Howells */ 485f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 486f3ddee8dSDavid Howells if (!page) { 487f3ddee8dSDavid Howells ret = -EIO; 4881da177e4SLinus Torvalds break; 4891da177e4SLinus Torvalds } 490f3ddee8dSDavid Howells mark_page_accessed(page); 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4931da177e4SLinus Torvalds 494f3ddee8dSDavid Howells dbuf = kmap(page); 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4971da177e4SLinus Torvalds do { 4981da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 4991da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 5001bbae9f8SAl Viro ret = afs_dir_iterate_block(ctx, dblock, blkoff); 5011da177e4SLinus Torvalds if (ret != 1) { 502f3ddee8dSDavid Howells kunmap(page); 5031da177e4SLinus Torvalds goto out; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 5071da177e4SLinus Torvalds 5081bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 5091da177e4SLinus Torvalds 510f3ddee8dSDavid Howells kunmap(page); 5111da177e4SLinus Torvalds ret = 0; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds out: 515f3ddee8dSDavid Howells afs_put_read(req); 5161da177e4SLinus Torvalds _leave(" = %d", ret); 5171da177e4SLinus Torvalds return ret; 518ec26815aSDavid Howells } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /* 5211da177e4SLinus Torvalds * read an AFS directory 5221da177e4SLinus Torvalds */ 5231bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 5241da177e4SLinus Torvalds { 525215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 526ec26815aSDavid Howells } 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds /* 5295cf9dd55SDavid Howells * Search the directory for a single name 5301da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5311da177e4SLinus Torvalds * uniquifier through dtype 5321da177e4SLinus Torvalds */ 5335cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 534ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 5351da177e4SLinus Torvalds { 5365cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 5375cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 5381da177e4SLinus Torvalds 5391bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5401bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 541ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5421da177e4SLinus Torvalds 54308e0e7c8SDavid Howells /* insanity checks first */ 54408e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 54508e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 54608e0e7c8SDavid Howells 5471bbae9f8SAl Viro if (cookie->name.len != nlen || 5481bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5491da177e4SLinus Torvalds _leave(" = 0 [no]"); 5501da177e4SLinus Torvalds return 0; 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds cookie->fid.vnode = ino; 5541da177e4SLinus Torvalds cookie->fid.unique = dtype; 5551da177e4SLinus Torvalds cookie->found = 1; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds _leave(" = -1 [found]"); 5581da177e4SLinus Torvalds return -1; 559ec26815aSDavid Howells } 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds /* 5625cf9dd55SDavid Howells * Do a lookup of a single name in a directory 563260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5641da177e4SLinus Torvalds */ 5655cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 56600d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 5671da177e4SLinus Torvalds { 5681bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5695cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5705cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5711bbae9f8SAl Viro .name = dentry->d_name, 5721bbae9f8SAl Viro .fid.vid = as->volume->vid 5731bbae9f8SAl Viro }; 5741da177e4SLinus Torvalds int ret; 5751da177e4SLinus Torvalds 576a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds /* search the directory */ 5791bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 5801da177e4SLinus Torvalds if (ret < 0) { 58108e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 58208e0e7c8SDavid Howells return ret; 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds ret = -ENOENT; 5861da177e4SLinus Torvalds if (!cookie.found) { 58708e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 58808e0e7c8SDavid Howells return -ENOENT; 58908e0e7c8SDavid Howells } 59008e0e7c8SDavid Howells 59108e0e7c8SDavid Howells *fid = cookie.fid; 59208e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 59308e0e7c8SDavid Howells return 0; 59408e0e7c8SDavid Howells } 59508e0e7c8SDavid Howells 59608e0e7c8SDavid Howells /* 5975cf9dd55SDavid Howells * search the directory for a name 5985cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5995cf9dd55SDavid Howells * uniquifier through dtype 6005cf9dd55SDavid Howells */ 6015cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 6025cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 6035cf9dd55SDavid Howells { 6045cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 6055cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 6065cf9dd55SDavid Howells int ret; 6075cf9dd55SDavid Howells 6085cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 6095cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 6105cf9dd55SDavid Howells (unsigned long long) ino, dtype); 6115cf9dd55SDavid Howells 6125cf9dd55SDavid Howells /* insanity checks first */ 6135cf9dd55SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 6145cf9dd55SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 6155cf9dd55SDavid Howells 6165cf9dd55SDavid Howells if (cookie->found) { 6175cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 6185cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 6195cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 6205cf9dd55SDavid Howells cookie->nr_fids++; 6215cf9dd55SDavid Howells } 6225cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 6235cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 6245cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 6255cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 6265cf9dd55SDavid Howells cookie->found = 1; 6275cf9dd55SDavid Howells if (cookie->one_only) 6285cf9dd55SDavid Howells return -1; 6295cf9dd55SDavid Howells } 6305cf9dd55SDavid Howells 6315cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 6325cf9dd55SDavid Howells _leave(" = %d", ret); 6335cf9dd55SDavid Howells return ret; 6345cf9dd55SDavid Howells } 6355cf9dd55SDavid Howells 6365cf9dd55SDavid Howells /* 6375cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 6385cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 6395cf9dd55SDavid Howells * asked for is returned. 6405cf9dd55SDavid Howells */ 6415cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6425cf9dd55SDavid Howells struct key *key) 6435cf9dd55SDavid Howells { 6445cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 6455cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 6465cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 6475cf9dd55SDavid Howells struct afs_iget_data data; 6485cf9dd55SDavid Howells struct afs_fs_cursor fc; 6495cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 6505cf9dd55SDavid Howells struct inode *inode = NULL; 6515cf9dd55SDavid Howells int ret, i; 6525cf9dd55SDavid Howells 6535cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6545cf9dd55SDavid Howells 6555cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6565cf9dd55SDavid Howells if (!cookie) 6575cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6585cf9dd55SDavid Howells 6595cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6605cf9dd55SDavid Howells cookie->name = dentry->d_name; 6615cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6625cf9dd55SDavid Howells 6635cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 6645cf9dd55SDavid Howells if (dvnode->cb_interest && 6655cf9dd55SDavid Howells dvnode->cb_interest->server && 6665cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 6675cf9dd55SDavid Howells cookie->one_only = true; 6685cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6695cf9dd55SDavid Howells 6705cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6715cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6725cf9dd55SDavid Howells 6735cf9dd55SDavid Howells /* search the directory */ 6745cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 6755cf9dd55SDavid Howells if (ret < 0) { 6765cf9dd55SDavid Howells inode = ERR_PTR(ret); 6775cf9dd55SDavid Howells goto out; 6785cf9dd55SDavid Howells } 6795cf9dd55SDavid Howells 6805cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6815cf9dd55SDavid Howells if (!cookie->found) 6825cf9dd55SDavid Howells goto out; 6835cf9dd55SDavid Howells 6845cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 6855cf9dd55SDavid Howells data.volume = dvnode->volume; 6865cf9dd55SDavid Howells data.fid = cookie->fids[0]; 6875cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 6885cf9dd55SDavid Howells if (inode) 6895cf9dd55SDavid Howells goto out; 6905cf9dd55SDavid Howells 6915cf9dd55SDavid Howells /* Need space for examining all the selected files */ 6925cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 6935cf9dd55SDavid Howells cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), 6945cf9dd55SDavid Howells GFP_KERNEL); 6955cf9dd55SDavid Howells if (!cookie->statuses) 6965cf9dd55SDavid Howells goto out; 6975cf9dd55SDavid Howells 6985cf9dd55SDavid Howells cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), 6995cf9dd55SDavid Howells GFP_KERNEL); 7005cf9dd55SDavid Howells if (!cookie->callbacks) 7015cf9dd55SDavid Howells goto out_s; 7025cf9dd55SDavid Howells 7035cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 7045cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 7055cf9dd55SDavid Howells * the whole operation. 7065cf9dd55SDavid Howells */ 7075cf9dd55SDavid Howells if (cookie->one_only) 7085cf9dd55SDavid Howells goto no_inline_bulk_status; 7095cf9dd55SDavid Howells 7105cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 7115cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7125cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7135cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 7145cf9dd55SDavid Howells &fc.cbi->server->flags)) { 7155cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 7165cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 7175cf9dd55SDavid Howells break; 7185cf9dd55SDavid Howells } 7195cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 7205cf9dd55SDavid Howells afs_v2net(dvnode), 7215cf9dd55SDavid Howells cookie->fids, 7225cf9dd55SDavid Howells cookie->statuses, 7235cf9dd55SDavid Howells cookie->callbacks, 7245cf9dd55SDavid Howells cookie->nr_fids, NULL); 7255cf9dd55SDavid Howells } 7265cf9dd55SDavid Howells 7275cf9dd55SDavid Howells if (fc.ac.error == 0) 7285cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7295cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 7305cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 7315cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7325cf9dd55SDavid Howells } 7335cf9dd55SDavid Howells 7345cf9dd55SDavid Howells if (!IS_ERR(inode)) 7355cf9dd55SDavid Howells goto success; 7365cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 7375cf9dd55SDavid Howells goto out_c; 7385cf9dd55SDavid Howells 7395cf9dd55SDavid Howells no_inline_bulk_status: 7405cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7415cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7425cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7435cf9dd55SDavid Howells */ 7445cf9dd55SDavid Howells cookie->nr_fids = 1; 7455cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 7465cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7475cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7485cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7495cf9dd55SDavid Howells afs_v2net(dvnode), 7505cf9dd55SDavid Howells cookie->fids, 7515cf9dd55SDavid Howells cookie->statuses, 7525cf9dd55SDavid Howells cookie->callbacks, 7535cf9dd55SDavid Howells NULL); 7545cf9dd55SDavid Howells } 7555cf9dd55SDavid Howells 7565cf9dd55SDavid Howells if (fc.ac.error == 0) 7575cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7585cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7595cf9dd55SDavid Howells } 7605cf9dd55SDavid Howells 7615cf9dd55SDavid Howells if (IS_ERR(inode)) 7625cf9dd55SDavid Howells goto out_c; 7635cf9dd55SDavid Howells 7645cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 7655cf9dd55SDavid Howells cookie->statuses[i].abort_code = 0; 7665cf9dd55SDavid Howells 7675cf9dd55SDavid Howells success: 7685cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7695cf9dd55SDavid Howells * one we actually want. 7705cf9dd55SDavid Howells */ 7715cf9dd55SDavid Howells if (cookie->statuses[0].abort_code != 0) 7725cf9dd55SDavid Howells inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); 7735cf9dd55SDavid Howells 7745cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 7755cf9dd55SDavid Howells struct inode *ti; 7765cf9dd55SDavid Howells 7775cf9dd55SDavid Howells if (cookie->statuses[i].abort_code != 0) 7785cf9dd55SDavid Howells continue; 7795cf9dd55SDavid Howells 7805cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 7815cf9dd55SDavid Howells &cookie->statuses[i], 7825cf9dd55SDavid Howells &cookie->callbacks[i], 7835cf9dd55SDavid Howells cbi); 7845cf9dd55SDavid Howells if (i == 0) { 7855cf9dd55SDavid Howells inode = ti; 7865cf9dd55SDavid Howells } else { 7875cf9dd55SDavid Howells if (!IS_ERR(ti)) 7885cf9dd55SDavid Howells iput(ti); 7895cf9dd55SDavid Howells } 7905cf9dd55SDavid Howells } 7915cf9dd55SDavid Howells 7925cf9dd55SDavid Howells out_c: 7935cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 7945cf9dd55SDavid Howells kfree(cookie->callbacks); 7955cf9dd55SDavid Howells out_s: 7965cf9dd55SDavid Howells kfree(cookie->statuses); 7975cf9dd55SDavid Howells out: 7985cf9dd55SDavid Howells kfree(cookie); 7995cf9dd55SDavid Howells return inode; 8005cf9dd55SDavid Howells } 8015cf9dd55SDavid Howells 8025cf9dd55SDavid Howells /* 8036f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 8046f8880d8SDavid Howells */ 8056f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 8066f8880d8SDavid Howells struct key *key) 8076f8880d8SDavid Howells { 8086f8880d8SDavid Howells struct afs_sysnames *subs; 8096f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 8106f8880d8SDavid Howells struct dentry *ret; 8116f8880d8SDavid Howells char *buf, *p, *name; 8126f8880d8SDavid Howells int len, i; 8136f8880d8SDavid Howells 8146f8880d8SDavid Howells _enter(""); 8156f8880d8SDavid Howells 8166f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 8176f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 8186f8880d8SDavid Howells if (!buf) 8196f8880d8SDavid Howells goto out_p; 8206f8880d8SDavid Howells if (dentry->d_name.len > 4) { 8216f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 8226f8880d8SDavid Howells p += dentry->d_name.len - 4; 8236f8880d8SDavid Howells } 8246f8880d8SDavid Howells 8256f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 8266f8880d8SDavid Howells read_lock(&net->sysnames_lock); 8276f8880d8SDavid Howells subs = net->sysnames; 8286f8880d8SDavid Howells refcount_inc(&subs->usage); 8296f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 8306f8880d8SDavid Howells 8316f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8326f8880d8SDavid Howells name = subs->subs[i]; 8336f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8346f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8356f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8366f8880d8SDavid Howells goto out_s; 8376f8880d8SDavid Howells } 8386f8880d8SDavid Howells 8396f8880d8SDavid Howells strcpy(p, name); 8406f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8416f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8426f8880d8SDavid Howells goto out_s; 8436f8880d8SDavid Howells dput(ret); 8446f8880d8SDavid Howells } 8456f8880d8SDavid Howells 8466f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8476f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8486f8880d8SDavid Howells */ 8496f8880d8SDavid Howells ret = NULL; 8506f8880d8SDavid Howells out_s: 8516f8880d8SDavid Howells afs_put_sysnames(subs); 8526f8880d8SDavid Howells kfree(buf); 8536f8880d8SDavid Howells out_p: 8546f8880d8SDavid Howells key_put(key); 8556f8880d8SDavid Howells return ret; 8566f8880d8SDavid Howells } 8576f8880d8SDavid Howells 8586f8880d8SDavid Howells /* 85908e0e7c8SDavid Howells * look up an entry in a directory 86008e0e7c8SDavid Howells */ 861260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 86200cd8dd3SAl Viro unsigned int flags) 86308e0e7c8SDavid Howells { 8645cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 86508e0e7c8SDavid Howells struct inode *inode; 86600d3b7a4SDavid Howells struct key *key; 86708e0e7c8SDavid Howells int ret; 86808e0e7c8SDavid Howells 869a455589fSAl Viro _enter("{%x:%u},%p{%pd},", 8705cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 871260a9803SDavid Howells 8722b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 87308e0e7c8SDavid Howells 87445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 87508e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 87608e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 87708e0e7c8SDavid Howells } 87808e0e7c8SDavid Howells 8795cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 88008e0e7c8SDavid Howells _leave(" = -ESTALE"); 88108e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 88208e0e7c8SDavid Howells } 88308e0e7c8SDavid Howells 8845cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 88500d3b7a4SDavid Howells if (IS_ERR(key)) { 88600d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 887e231c2eeSDavid Howells return ERR_CAST(key); 88800d3b7a4SDavid Howells } 88900d3b7a4SDavid Howells 8905cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 89108e0e7c8SDavid Howells if (ret < 0) { 89200d3b7a4SDavid Howells key_put(key); 893260a9803SDavid Howells _leave(" = %d [val]", ret); 8941da177e4SLinus Torvalds return ERR_PTR(ret); 8951da177e4SLinus Torvalds } 8961da177e4SLinus Torvalds 8976f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8986f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8996f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 9006f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 9016f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 9026f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 9036f8880d8SDavid Howells 904d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 9055cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 9065cf9dd55SDavid Howells if (IS_ERR(inode)) { 9075cf9dd55SDavid Howells ret = PTR_ERR(inode); 9084d673da1SDavid Howells if (ret == -ENOENT) { 9095cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 910bec5eb61Swanglei if (!IS_ERR(inode)) { 911bec5eb61Swanglei key_put(key); 912bec5eb61Swanglei goto success; 913bec5eb61Swanglei } 914bec5eb61Swanglei 915bec5eb61Swanglei ret = PTR_ERR(inode); 9164d673da1SDavid Howells } 9174d673da1SDavid Howells 918260a9803SDavid Howells key_put(key); 919260a9803SDavid Howells if (ret == -ENOENT) { 920260a9803SDavid Howells d_add(dentry, NULL); 921260a9803SDavid Howells _leave(" = NULL [negative]"); 922260a9803SDavid Howells return NULL; 923260a9803SDavid Howells } 924260a9803SDavid Howells _leave(" = %d [do]", ret); 925260a9803SDavid Howells return ERR_PTR(ret); 926260a9803SDavid Howells } 9275cf9dd55SDavid Howells dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version; 928260a9803SDavid Howells 9291da177e4SLinus Torvalds /* instantiate the dentry */ 93000d3b7a4SDavid Howells key_put(key); 93108e0e7c8SDavid Howells if (IS_ERR(inode)) { 93208e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 933e231c2eeSDavid Howells return ERR_CAST(inode); 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 936bec5eb61Swanglei success: 9371da177e4SLinus Torvalds d_add(dentry, inode); 9385cf9dd55SDavid Howells _leave(" = 0 { ino=%lu v=%u }", 9392b0143b5SDavid Howells d_inode(dentry)->i_ino, 9402b0143b5SDavid Howells d_inode(dentry)->i_generation); 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds return NULL; 943ec26815aSDavid Howells } 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds /* 9461da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 9471da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 9481da177e4SLinus Torvalds * inode 9491da177e4SLinus Torvalds */ 9500b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 9511da177e4SLinus Torvalds { 952260a9803SDavid Howells struct afs_vnode *vnode, *dir; 953dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 9541da177e4SLinus Torvalds struct dentry *parent; 955c435ee34SDavid Howells struct inode *inode; 95600d3b7a4SDavid Howells struct key *key; 957a4ff7401SDavid Howells long dir_version, de_version; 9581da177e4SLinus Torvalds int ret; 9591da177e4SLinus Torvalds 9600b728e19SAl Viro if (flags & LOOKUP_RCU) 96134286d66SNick Piggin return -ECHILD; 96234286d66SNick Piggin 963c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9642b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 965a455589fSAl Viro _enter("{v={%x:%u} n=%pd fl=%lx},", 966a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 967260a9803SDavid Howells vnode->flags); 968c435ee34SDavid Howells } else { 969a455589fSAl Viro _enter("{neg n=%pd}", dentry); 970c435ee34SDavid Howells } 9711da177e4SLinus Torvalds 972260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 97300d3b7a4SDavid Howells if (IS_ERR(key)) 97400d3b7a4SDavid Howells key = NULL; 97500d3b7a4SDavid Howells 976c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 977c435ee34SDavid Howells inode = d_inode(dentry); 978c435ee34SDavid Howells if (inode) { 979c435ee34SDavid Howells vnode = AFS_FS_I(inode); 980c435ee34SDavid Howells afs_validate(vnode, key); 981c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 982c435ee34SDavid Howells goto out_bad; 983c435ee34SDavid Howells } 984c435ee34SDavid Howells } 985c435ee34SDavid Howells 9861da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 98708e0e7c8SDavid Howells parent = dget_parent(dentry); 9882b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9891da177e4SLinus Torvalds 990260a9803SDavid Howells /* validate the parent directory */ 991260a9803SDavid Howells afs_validate(dir, key); 992260a9803SDavid Howells 993260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 994a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 995c435ee34SDavid Howells goto out_bad_parent; 9961da177e4SLinus Torvalds } 9971da177e4SLinus Torvalds 998a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 999a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1000a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1001a4ff7401SDavid Howells * version. 1002a4ff7401SDavid Howells */ 1003a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 1004a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 1005a4ff7401SDavid Howells if (de_version == dir_version) 1006a4ff7401SDavid Howells goto out_valid; 1007a4ff7401SDavid Howells 1008a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 1009a4ff7401SDavid Howells if (de_version - dir_version >= 0) 1010a4ff7401SDavid Howells goto out_valid; 1011260a9803SDavid Howells 101208e0e7c8SDavid Howells _debug("dir modified"); 1013d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds /* search the directory for this vnode */ 10165cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 1017260a9803SDavid Howells switch (ret) { 1018260a9803SDavid Howells case 0: 1019260a9803SDavid Howells /* the filename maps to something */ 10202b0143b5SDavid Howells if (d_really_is_negative(dentry)) 1021c435ee34SDavid Howells goto out_bad_parent; 1022c435ee34SDavid Howells inode = d_inode(dentry); 1023c435ee34SDavid Howells if (is_bad_inode(inode)) { 1024a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1025a455589fSAl Viro dentry); 1026c435ee34SDavid Howells goto out_bad_parent; 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 1029c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1030c435ee34SDavid Howells 10311da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 10321da177e4SLinus Torvalds * different file */ 103308e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 1034a455589fSAl Viro _debug("%pd: dirent changed [%u != %u]", 1035a455589fSAl Viro dentry, fid.vnode, 103608e0e7c8SDavid Howells vnode->fid.vnode); 10371da177e4SLinus Torvalds goto not_found; 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1041260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1042260a9803SDavid Howells * been reused */ 104308e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1044a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1045a455589fSAl Viro dentry, fid.unique, 10467a224228SJean Noel Cordenner vnode->fid.unique, 1047c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1048c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 104908e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1050c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1051260a9803SDavid Howells goto not_found; 1052260a9803SDavid Howells } 1053260a9803SDavid Howells goto out_valid; 1054260a9803SDavid Howells 1055260a9803SDavid Howells case -ENOENT: 1056260a9803SDavid Howells /* the filename is unknown */ 1057a455589fSAl Viro _debug("%pd: dirent not found", dentry); 10582b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1059260a9803SDavid Howells goto not_found; 1060260a9803SDavid Howells goto out_valid; 1061260a9803SDavid Howells 1062260a9803SDavid Howells default: 1063a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1064a455589fSAl Viro parent, ret); 1065c435ee34SDavid Howells goto out_bad_parent; 10661da177e4SLinus Torvalds } 106708e0e7c8SDavid Howells 10681da177e4SLinus Torvalds out_valid: 1069a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10701da177e4SLinus Torvalds dput(parent); 107100d3b7a4SDavid Howells key_put(key); 10721da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10731da177e4SLinus Torvalds return 1; 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10761da177e4SLinus Torvalds not_found: 10771da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10781da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10791da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10801da177e4SLinus Torvalds 1081c435ee34SDavid Howells out_bad_parent: 1082a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10831da177e4SLinus Torvalds dput(parent); 1084c435ee34SDavid Howells out_bad: 108500d3b7a4SDavid Howells key_put(key); 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10881da177e4SLinus Torvalds return 0; 1089ec26815aSDavid Howells } 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds /* 10921da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10931da177e4SLinus Torvalds * sleep) 10941da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10951da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10961da177e4SLinus Torvalds */ 1097fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10981da177e4SLinus Torvalds { 1099a455589fSAl Viro _enter("%pd", dentry); 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 11021da177e4SLinus Torvalds goto zap; 11031da177e4SLinus Torvalds 11042b0143b5SDavid Howells if (d_really_is_positive(dentry) && 11052b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 11062b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 11071da177e4SLinus Torvalds goto zap; 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds _leave(" = 0 [keep]"); 11101da177e4SLinus Torvalds return 0; 11111da177e4SLinus Torvalds 11121da177e4SLinus Torvalds zap: 11131da177e4SLinus Torvalds _leave(" = 1 [zap]"); 11141da177e4SLinus Torvalds return 1; 1115ec26815aSDavid Howells } 1116260a9803SDavid Howells 1117260a9803SDavid Howells /* 1118260a9803SDavid Howells * handle dentry release 1119260a9803SDavid Howells */ 112066c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1121260a9803SDavid Howells { 1122a455589fSAl Viro _enter("%pd", dentry); 1123260a9803SDavid Howells } 1124260a9803SDavid Howells 1125260a9803SDavid Howells /* 1126d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1127d2ddc776SDavid Howells */ 1128d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1129d2ddc776SDavid Howells struct dentry *new_dentry, 1130d2ddc776SDavid Howells struct afs_fid *newfid, 1131d2ddc776SDavid Howells struct afs_file_status *newstatus, 1132d2ddc776SDavid Howells struct afs_callback *newcb) 1133d2ddc776SDavid Howells { 1134d2ddc776SDavid Howells struct inode *inode; 1135d2ddc776SDavid Howells 1136d2ddc776SDavid Howells if (fc->ac.error < 0) 1137d2ddc776SDavid Howells return; 1138d2ddc776SDavid Howells 1139bc1527dcSDavid Howells d_drop(new_dentry); 1140bc1527dcSDavid Howells 1141d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1142d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1143d2ddc776SDavid Howells if (IS_ERR(inode)) { 1144d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1145d2ddc776SDavid Howells * the new directory on the server. 1146d2ddc776SDavid Howells */ 1147d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1148d2ddc776SDavid Howells return; 1149d2ddc776SDavid Howells } 1150d2ddc776SDavid Howells 1151bc1527dcSDavid Howells d_add(new_dentry, inode); 1152d2ddc776SDavid Howells } 1153d2ddc776SDavid Howells 1154d2ddc776SDavid Howells /* 1155260a9803SDavid Howells * create a directory on an AFS filesystem 1156260a9803SDavid Howells */ 115718bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1158260a9803SDavid Howells { 1159d2ddc776SDavid Howells struct afs_file_status newstatus; 1160d2ddc776SDavid Howells struct afs_fs_cursor fc; 1161d2ddc776SDavid Howells struct afs_callback newcb; 1162d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1163d2ddc776SDavid Howells struct afs_fid newfid; 1164260a9803SDavid Howells struct key *key; 1165260a9803SDavid Howells int ret; 1166260a9803SDavid Howells 1167d2ddc776SDavid Howells mode |= S_IFDIR; 1168260a9803SDavid Howells 1169a455589fSAl Viro _enter("{%x:%u},{%pd},%ho", 1170a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1171260a9803SDavid Howells 1172260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1173260a9803SDavid Howells if (IS_ERR(key)) { 1174260a9803SDavid Howells ret = PTR_ERR(key); 1175260a9803SDavid Howells goto error; 1176260a9803SDavid Howells } 1177260a9803SDavid Howells 1178d2ddc776SDavid Howells ret = -ERESTARTSYS; 1179d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1180d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1181d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1182d2ddc776SDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1183d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1184d2ddc776SDavid Howells } 1185d2ddc776SDavid Howells 1186d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1187d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1188d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1189d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1190260a9803SDavid Howells if (ret < 0) 1191d2ddc776SDavid Howells goto error_key; 11924433b691SDavid Howells } else { 11934433b691SDavid Howells goto error_key; 1194260a9803SDavid Howells } 1195260a9803SDavid Howells 1196260a9803SDavid Howells key_put(key); 1197260a9803SDavid Howells _leave(" = 0"); 1198260a9803SDavid Howells return 0; 1199260a9803SDavid Howells 1200d2ddc776SDavid Howells error_key: 1201260a9803SDavid Howells key_put(key); 1202260a9803SDavid Howells error: 1203260a9803SDavid Howells d_drop(dentry); 1204260a9803SDavid Howells _leave(" = %d", ret); 1205260a9803SDavid Howells return ret; 1206260a9803SDavid Howells } 1207260a9803SDavid Howells 1208260a9803SDavid Howells /* 1209d2ddc776SDavid Howells * Remove a subdir from a directory. 1210260a9803SDavid Howells */ 1211d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1212260a9803SDavid Howells { 12132b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1214d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1215d2ddc776SDavid Howells 1216260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1217260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1218c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1219260a9803SDavid Howells } 1220260a9803SDavid Howells } 1221260a9803SDavid Howells 1222260a9803SDavid Howells /* 1223d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1224260a9803SDavid Howells */ 1225d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1226260a9803SDavid Howells { 1227d2ddc776SDavid Howells struct afs_fs_cursor fc; 1228d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1229260a9803SDavid Howells struct key *key; 1230260a9803SDavid Howells int ret; 1231260a9803SDavid Howells 1232a455589fSAl Viro _enter("{%x:%u},{%pd}", 1233a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1234260a9803SDavid Howells 1235260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1236260a9803SDavid Howells if (IS_ERR(key)) { 1237260a9803SDavid Howells ret = PTR_ERR(key); 1238260a9803SDavid Howells goto error; 1239260a9803SDavid Howells } 1240260a9803SDavid Howells 1241d2ddc776SDavid Howells ret = -ERESTARTSYS; 1242d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1243d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1244d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1245d2ddc776SDavid Howells afs_fs_remove(&fc, dentry->d_name.name, true); 1246260a9803SDavid Howells } 1247260a9803SDavid Howells 1248d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1249d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1250d2ddc776SDavid Howells if (ret == 0) 1251d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 1252260a9803SDavid Howells } 1253260a9803SDavid Howells 1254260a9803SDavid Howells key_put(key); 1255d2ddc776SDavid Howells error: 1256d2ddc776SDavid Howells return ret; 1257d2ddc776SDavid Howells } 1258260a9803SDavid Howells 1259d2ddc776SDavid Howells /* 1260d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1261d2ddc776SDavid Howells * 1262d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1263d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1264d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1265d2ddc776SDavid Howells * 1266d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1267d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1268d2ddc776SDavid Howells */ 1269440fbc3aSDavid Howells static int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1270440fbc3aSDavid Howells unsigned long d_version_before, 1271440fbc3aSDavid Howells unsigned long d_version_after) 1272d2ddc776SDavid Howells { 1273440fbc3aSDavid Howells bool dir_valid; 1274d2ddc776SDavid Howells int ret = 0; 1275d2ddc776SDavid Howells 1276440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1277440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1278440fbc3aSDavid Howells */ 1279440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1280440fbc3aSDavid Howells 1281d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1282d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1283d2ddc776SDavid Howells 1284440fbc3aSDavid Howells if (dir_valid) { 1285440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1286440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1287440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1288440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1289440fbc3aSDavid Howells } 1290440fbc3aSDavid Howells ret = 0; 1291440fbc3aSDavid Howells } else { 1292440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1293440fbc3aSDavid Howells 1294d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1295d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1296d2ddc776SDavid Howells 1297d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1298d2ddc776SDavid Howells if (ret == -ESTALE) 1299d2ddc776SDavid Howells ret = 0; 1300440fbc3aSDavid Howells } 1301d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1302d2ddc776SDavid Howells } 1303d2ddc776SDavid Howells 1304d2ddc776SDavid Howells return ret; 1305d2ddc776SDavid Howells } 1306d2ddc776SDavid Howells 1307d2ddc776SDavid Howells /* 1308d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1309d2ddc776SDavid Howells */ 1310d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1311d2ddc776SDavid Howells { 1312d2ddc776SDavid Howells struct afs_fs_cursor fc; 1313d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 1314d2ddc776SDavid Howells struct key *key; 1315440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 1316d2ddc776SDavid Howells int ret; 1317d2ddc776SDavid Howells 1318d2ddc776SDavid Howells _enter("{%x:%u},{%pd}", 1319d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1320d2ddc776SDavid Howells 1321d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1322d2ddc776SDavid Howells return -ENAMETOOLONG; 1323d2ddc776SDavid Howells 1324d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1325d2ddc776SDavid Howells if (IS_ERR(key)) { 1326d2ddc776SDavid Howells ret = PTR_ERR(key); 1327d2ddc776SDavid Howells goto error; 1328d2ddc776SDavid Howells } 1329d2ddc776SDavid Howells 1330d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1331d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1332d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1333d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1334d2ddc776SDavid Howells if (ret < 0) 1335d2ddc776SDavid Howells goto error_key; 1336d2ddc776SDavid Howells } 1337d2ddc776SDavid Howells 1338d2ddc776SDavid Howells ret = -ERESTARTSYS; 1339d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1340d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1341d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1342d2ddc776SDavid Howells afs_fs_remove(&fc, dentry->d_name.name, false); 1343d2ddc776SDavid Howells } 1344d2ddc776SDavid Howells 1345d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1346d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1347d2ddc776SDavid Howells if (ret == 0) 1348440fbc3aSDavid Howells ret = afs_dir_remove_link( 1349440fbc3aSDavid Howells dentry, key, d_version, 1350440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 1351d2ddc776SDavid Howells } 1352d2ddc776SDavid Howells 1353d2ddc776SDavid Howells error_key: 1354260a9803SDavid Howells key_put(key); 1355260a9803SDavid Howells error: 1356260a9803SDavid Howells _leave(" = %d", ret); 1357260a9803SDavid Howells return ret; 1358260a9803SDavid Howells } 1359260a9803SDavid Howells 1360260a9803SDavid Howells /* 1361260a9803SDavid Howells * create a regular file on an AFS filesystem 1362260a9803SDavid Howells */ 13634acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1364ebfc3b49SAl Viro bool excl) 1365260a9803SDavid Howells { 1366d2ddc776SDavid Howells struct afs_fs_cursor fc; 1367d2ddc776SDavid Howells struct afs_file_status newstatus; 1368d2ddc776SDavid Howells struct afs_callback newcb; 136943dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1370d2ddc776SDavid Howells struct afs_fid newfid; 1371260a9803SDavid Howells struct key *key; 1372260a9803SDavid Howells int ret; 1373260a9803SDavid Howells 1374d2ddc776SDavid Howells mode |= S_IFREG; 1375260a9803SDavid Howells 1376a455589fSAl Viro _enter("{%x:%u},{%pd},%ho,", 1377a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1378260a9803SDavid Howells 1379d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1380d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1381d2ddc776SDavid Howells goto error; 1382d2ddc776SDavid Howells 1383260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1384260a9803SDavid Howells if (IS_ERR(key)) { 1385260a9803SDavid Howells ret = PTR_ERR(key); 1386260a9803SDavid Howells goto error; 1387260a9803SDavid Howells } 1388260a9803SDavid Howells 1389d2ddc776SDavid Howells ret = -ERESTARTSYS; 1390d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1391d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1392d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1393d2ddc776SDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1394d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1395d2ddc776SDavid Howells } 1396d2ddc776SDavid Howells 1397d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1398d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1399d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1400d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1401260a9803SDavid Howells if (ret < 0) 1402d2ddc776SDavid Howells goto error_key; 14034433b691SDavid Howells } else { 14044433b691SDavid Howells goto error_key; 1405260a9803SDavid Howells } 1406260a9803SDavid Howells 1407260a9803SDavid Howells key_put(key); 1408260a9803SDavid Howells _leave(" = 0"); 1409260a9803SDavid Howells return 0; 1410260a9803SDavid Howells 1411d2ddc776SDavid Howells error_key: 1412260a9803SDavid Howells key_put(key); 1413260a9803SDavid Howells error: 1414260a9803SDavid Howells d_drop(dentry); 1415260a9803SDavid Howells _leave(" = %d", ret); 1416260a9803SDavid Howells return ret; 1417260a9803SDavid Howells } 1418260a9803SDavid Howells 1419260a9803SDavid Howells /* 1420260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1421260a9803SDavid Howells */ 1422260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1423260a9803SDavid Howells struct dentry *dentry) 1424260a9803SDavid Howells { 1425d2ddc776SDavid Howells struct afs_fs_cursor fc; 1426260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1427260a9803SDavid Howells struct key *key; 1428260a9803SDavid Howells int ret; 1429260a9803SDavid Howells 14302b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1431260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1432260a9803SDavid Howells 1433a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%pd}", 1434260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1435260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1436a455589fSAl Viro dentry); 1437260a9803SDavid Howells 1438d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1439d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1440d2ddc776SDavid Howells goto error; 1441d2ddc776SDavid Howells 1442260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1443260a9803SDavid Howells if (IS_ERR(key)) { 1444260a9803SDavid Howells ret = PTR_ERR(key); 1445260a9803SDavid Howells goto error; 1446260a9803SDavid Howells } 1447260a9803SDavid Howells 1448d2ddc776SDavid Howells ret = -ERESTARTSYS; 1449d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1450d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1451d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1452bc1527dcSDavid Howells goto error_key; 1453d2ddc776SDavid Howells } 1454260a9803SDavid Howells 1455d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1456d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1457d2ddc776SDavid Howells fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; 1458d2ddc776SDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name); 1459d2ddc776SDavid Howells } 1460d2ddc776SDavid Howells 1461d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1462d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 14637de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1464260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1465d2ddc776SDavid Howells 1466d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1467d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1468d2ddc776SDavid Howells if (ret < 0) 1469d2ddc776SDavid Howells goto error_key; 14704433b691SDavid Howells } else { 14714433b691SDavid Howells goto error_key; 1472d2ddc776SDavid Howells } 1473d2ddc776SDavid Howells 1474260a9803SDavid Howells key_put(key); 1475260a9803SDavid Howells _leave(" = 0"); 1476260a9803SDavid Howells return 0; 1477260a9803SDavid Howells 1478d2ddc776SDavid Howells error_key: 1479260a9803SDavid Howells key_put(key); 1480260a9803SDavid Howells error: 1481260a9803SDavid Howells d_drop(dentry); 1482260a9803SDavid Howells _leave(" = %d", ret); 1483260a9803SDavid Howells return ret; 1484260a9803SDavid Howells } 1485260a9803SDavid Howells 1486260a9803SDavid Howells /* 1487260a9803SDavid Howells * create a symlink in an AFS filesystem 1488260a9803SDavid Howells */ 1489260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1490260a9803SDavid Howells const char *content) 1491260a9803SDavid Howells { 1492d2ddc776SDavid Howells struct afs_fs_cursor fc; 1493d2ddc776SDavid Howells struct afs_file_status newstatus; 1494d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1495d2ddc776SDavid Howells struct afs_fid newfid; 1496260a9803SDavid Howells struct key *key; 1497260a9803SDavid Howells int ret; 1498260a9803SDavid Howells 1499a455589fSAl Viro _enter("{%x:%u},{%pd},%s", 1500a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1501260a9803SDavid Howells content); 1502260a9803SDavid Howells 1503d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1504d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1505d2ddc776SDavid Howells goto error; 1506d2ddc776SDavid Howells 1507260a9803SDavid Howells ret = -EINVAL; 150845222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1509260a9803SDavid Howells goto error; 1510260a9803SDavid Howells 1511260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1512260a9803SDavid Howells if (IS_ERR(key)) { 1513260a9803SDavid Howells ret = PTR_ERR(key); 1514260a9803SDavid Howells goto error; 1515260a9803SDavid Howells } 1516260a9803SDavid Howells 1517d2ddc776SDavid Howells ret = -ERESTARTSYS; 1518d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1519d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1520d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1521d2ddc776SDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, content, 1522d2ddc776SDavid Howells &newfid, &newstatus); 1523d2ddc776SDavid Howells } 1524d2ddc776SDavid Howells 1525d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1526d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1527d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1528d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1529260a9803SDavid Howells if (ret < 0) 1530d2ddc776SDavid Howells goto error_key; 15314433b691SDavid Howells } else { 15324433b691SDavid Howells goto error_key; 1533260a9803SDavid Howells } 1534260a9803SDavid Howells 1535260a9803SDavid Howells key_put(key); 1536260a9803SDavid Howells _leave(" = 0"); 1537260a9803SDavid Howells return 0; 1538260a9803SDavid Howells 1539d2ddc776SDavid Howells error_key: 1540260a9803SDavid Howells key_put(key); 1541260a9803SDavid Howells error: 1542260a9803SDavid Howells d_drop(dentry); 1543260a9803SDavid Howells _leave(" = %d", ret); 1544260a9803SDavid Howells return ret; 1545260a9803SDavid Howells } 1546260a9803SDavid Howells 1547260a9803SDavid Howells /* 1548260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1549260a9803SDavid Howells */ 1550260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 15511cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 15521cd66c93SMiklos Szeredi unsigned int flags) 1553260a9803SDavid Howells { 1554d2ddc776SDavid Howells struct afs_fs_cursor fc; 1555260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1556260a9803SDavid Howells struct key *key; 1557260a9803SDavid Howells int ret; 1558260a9803SDavid Howells 15591cd66c93SMiklos Szeredi if (flags) 15601cd66c93SMiklos Szeredi return -EINVAL; 15611cd66c93SMiklos Szeredi 15622b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1563260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1564260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1565260a9803SDavid Howells 1566a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1567260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1568260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1569260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1570a455589fSAl Viro new_dentry); 1571260a9803SDavid Howells 1572260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1573260a9803SDavid Howells if (IS_ERR(key)) { 1574260a9803SDavid Howells ret = PTR_ERR(key); 1575260a9803SDavid Howells goto error; 1576260a9803SDavid Howells } 1577260a9803SDavid Howells 1578d2ddc776SDavid Howells ret = -ERESTARTSYS; 1579d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1580d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1581d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1582d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1583bc1527dcSDavid Howells goto error_key; 1584d2ddc776SDavid Howells } 1585d2ddc776SDavid Howells } 1586d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1587d2ddc776SDavid Howells fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; 1588d2ddc776SDavid Howells fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; 1589d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 1590d2ddc776SDavid Howells new_dvnode, new_dentry->d_name.name); 1591d2ddc776SDavid Howells } 1592d2ddc776SDavid Howells 1593d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1594d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1595d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1596d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1597d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1598260a9803SDavid Howells if (ret < 0) 1599d2ddc776SDavid Howells goto error_key; 1600d2ddc776SDavid Howells } 1601d2ddc776SDavid Howells 1602d2ddc776SDavid Howells error_key: 1603260a9803SDavid Howells key_put(key); 1604260a9803SDavid Howells error: 1605260a9803SDavid Howells _leave(" = %d", ret); 1606260a9803SDavid Howells return ret; 1607260a9803SDavid Howells } 1608f3ddee8dSDavid Howells 1609f3ddee8dSDavid Howells /* 1610f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1611f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1612f3ddee8dSDavid Howells */ 1613f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1614f3ddee8dSDavid Howells { 1615f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1616f3ddee8dSDavid Howells 1617f3ddee8dSDavid Howells _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1618f3ddee8dSDavid Howells 1619f3ddee8dSDavid Howells set_page_private(page, 0); 1620f3ddee8dSDavid Howells ClearPagePrivate(page); 1621f3ddee8dSDavid Howells 1622f3ddee8dSDavid Howells /* The directory will need reloading. */ 1623f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1624f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1625f3ddee8dSDavid Howells return 1; 1626f3ddee8dSDavid Howells } 1627f3ddee8dSDavid Howells 1628f3ddee8dSDavid Howells /* 1629f3ddee8dSDavid Howells * invalidate part or all of a page 1630f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1631f3ddee8dSDavid Howells * the entire page) 1632f3ddee8dSDavid Howells */ 1633f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1634f3ddee8dSDavid Howells unsigned int length) 1635f3ddee8dSDavid Howells { 1636f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1637f3ddee8dSDavid Howells 1638f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1639f3ddee8dSDavid Howells 1640f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1641f3ddee8dSDavid Howells 1642f3ddee8dSDavid Howells /* The directory will need reloading. */ 1643f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1644f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1645f3ddee8dSDavid Howells 1646f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1647f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1648f3ddee8dSDavid Howells set_page_private(page, 0); 1649f3ddee8dSDavid Howells ClearPagePrivate(page); 1650f3ddee8dSDavid Howells } 1651f3ddee8dSDavid Howells } 1652