11da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 21da177e4SLinus Torvalds * 3f3ddee8dSDavid Howells * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/fs.h> 1434286d66SNick Piggin #include <linux/namei.h> 151da177e4SLinus Torvalds #include <linux/pagemap.h> 16f3ddee8dSDavid Howells #include <linux/swap.h> 1700d3b7a4SDavid Howells #include <linux/ctype.h> 18e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 19f3ddee8dSDavid Howells #include <linux/task_io_accounting_ops.h> 201da177e4SLinus Torvalds #include "internal.h" 214ea219a8SDavid Howells #include "xdr_fs.h" 221da177e4SLinus Torvalds 23260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2400cd8dd3SAl Viro unsigned int flags); 251da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 261bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 270b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 28fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 295cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 305cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 31ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 32afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 334acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 34ebfc3b49SAl Viro bool excl); 3518bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 36260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 37260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 38260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 39260a9803SDavid Howells struct dentry *dentry); 40260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 41260a9803SDavid Howells const char *content); 42260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 431cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 441cd66c93SMiklos Szeredi unsigned int flags); 45f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 46f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 47f3ddee8dSDavid Howells unsigned int length); 48f3ddee8dSDavid Howells 49f3ddee8dSDavid Howells static int afs_dir_set_page_dirty(struct page *page) 50f3ddee8dSDavid Howells { 51f3ddee8dSDavid Howells BUG(); /* This should never happen. */ 52f3ddee8dSDavid Howells } 531da177e4SLinus Torvalds 544b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 551da177e4SLinus Torvalds .open = afs_dir_open, 5600d3b7a4SDavid Howells .release = afs_release, 5729884effSAl Viro .iterate_shared = afs_readdir, 58e8d6c554SDavid Howells .lock = afs_lock, 593222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 601da177e4SLinus Torvalds }; 611da177e4SLinus Torvalds 62754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 63260a9803SDavid Howells .create = afs_create, 64260a9803SDavid Howells .lookup = afs_lookup, 65260a9803SDavid Howells .link = afs_link, 66260a9803SDavid Howells .unlink = afs_unlink, 67260a9803SDavid Howells .symlink = afs_symlink, 68260a9803SDavid Howells .mkdir = afs_mkdir, 69260a9803SDavid Howells .rmdir = afs_rmdir, 702773bf00SMiklos Szeredi .rename = afs_rename, 7100d3b7a4SDavid Howells .permission = afs_permission, 72416351f2SDavid Howells .getattr = afs_getattr, 7331143d5dSDavid Howells .setattr = afs_setattr, 74d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 77f3ddee8dSDavid Howells const struct address_space_operations afs_dir_aops = { 78f3ddee8dSDavid Howells .set_page_dirty = afs_dir_set_page_dirty, 79f3ddee8dSDavid Howells .releasepage = afs_dir_releasepage, 80f3ddee8dSDavid Howells .invalidatepage = afs_dir_invalidatepage, 81f3ddee8dSDavid Howells }; 82f3ddee8dSDavid Howells 83d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 841da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 851da177e4SLinus Torvalds .d_delete = afs_d_delete, 86260a9803SDavid Howells .d_release = afs_d_release, 87d18610b0SDavid Howells .d_automount = afs_d_automount, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 905cf9dd55SDavid Howells struct afs_lookup_one_cookie { 915cf9dd55SDavid Howells struct dir_context ctx; 925cf9dd55SDavid Howells struct qstr name; 935cf9dd55SDavid Howells bool found; 945cf9dd55SDavid Howells struct afs_fid fid; 955cf9dd55SDavid Howells }; 965cf9dd55SDavid Howells 97260a9803SDavid Howells struct afs_lookup_cookie { 981bbae9f8SAl Viro struct dir_context ctx; 991bbae9f8SAl Viro struct qstr name; 1005cf9dd55SDavid Howells bool found; 1015cf9dd55SDavid Howells bool one_only; 1025cf9dd55SDavid Howells unsigned short nr_fids; 1035cf9dd55SDavid Howells struct afs_file_status *statuses; 1045cf9dd55SDavid Howells struct afs_callback *callbacks; 1055cf9dd55SDavid Howells struct afs_fid fids[50]; 1061da177e4SLinus Torvalds }; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* 1091da177e4SLinus Torvalds * check that a directory page is valid 1101da177e4SLinus Torvalds */ 111f3ddee8dSDavid Howells static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 112f3ddee8dSDavid Howells loff_t i_size) 1131da177e4SLinus Torvalds { 11400317636SDavid Howells struct afs_xdr_dir_page *dbuf; 115f3ddee8dSDavid Howells loff_t latter, off; 1161da177e4SLinus Torvalds int tmp, qty; 1171da177e4SLinus Torvalds 118dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 119dab17c1aSDavid Howells * we must take care because the directory may change size under us. 120dab17c1aSDavid Howells */ 121dab17c1aSDavid Howells off = page_offset(page); 122dab17c1aSDavid Howells if (i_size <= off) 123dab17c1aSDavid Howells goto checked; 124dab17c1aSDavid Howells 125dab17c1aSDavid Howells latter = i_size - off; 1261da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1271da177e4SLinus Torvalds qty = PAGE_SIZE; 1281da177e4SLinus Torvalds else 1291da177e4SLinus Torvalds qty = latter; 13000317636SDavid Howells qty /= sizeof(union afs_xdr_dir_block); 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* check them */ 13363a4681fSDavid Howells dbuf = kmap(page); 1341da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 13500317636SDavid Howells if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 136dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 137f3ddee8dSDavid Howells __func__, dvnode->vfs_inode.i_ino, tmp, qty, 13800317636SDavid Howells ntohs(dbuf->blocks[tmp].hdr.magic)); 139f3ddee8dSDavid Howells trace_afs_dir_check_failed(dvnode, off, i_size); 14063a4681fSDavid Howells kunmap(page); 1411da177e4SLinus Torvalds goto error; 1421da177e4SLinus Torvalds } 14363a4681fSDavid Howells 14463a4681fSDavid Howells /* Make sure each block is NUL terminated so we can reasonably 14563a4681fSDavid Howells * use string functions on it. The filenames in the page 14663a4681fSDavid Howells * *should* be NUL-terminated anyway. 14763a4681fSDavid Howells */ 14863a4681fSDavid Howells ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 15163a4681fSDavid Howells kunmap(page); 15263a4681fSDavid Howells 153dab17c1aSDavid Howells checked: 154f3ddee8dSDavid Howells afs_stat_v(dvnode, n_read_dir); 155be5b82dbSAl Viro return true; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds error: 158be5b82dbSAl Viro return false; 159ec26815aSDavid Howells } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* 1621da177e4SLinus Torvalds * open an AFS directory file 1631da177e4SLinus Torvalds */ 1641da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 1671da177e4SLinus Torvalds 16800317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 16900317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 1701da177e4SLinus Torvalds 17108e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 1721da177e4SLinus Torvalds return -ENOENT; 1731da177e4SLinus Torvalds 17400d3b7a4SDavid Howells return afs_open(inode, file); 175ec26815aSDavid Howells } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 178f3ddee8dSDavid Howells * Read the directory into the pagecache in one go, scrubbing the previous 179f3ddee8dSDavid Howells * contents. The list of pages is returned, pinning them so that they don't 180f3ddee8dSDavid Howells * get reclaimed during the iteration. 181f3ddee8dSDavid Howells */ 182f3ddee8dSDavid Howells static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 183f3ddee8dSDavid Howells { 184f3ddee8dSDavid Howells struct afs_read *req; 185f3ddee8dSDavid Howells loff_t i_size; 186f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 187f3ddee8dSDavid Howells int ret = -ENOMEM; 188f3ddee8dSDavid Howells 189f3ddee8dSDavid Howells retry: 190f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 191f3ddee8dSDavid Howells if (i_size < 2048) 192f3ddee8dSDavid Howells return ERR_PTR(-EIO); 193f3ddee8dSDavid Howells if (i_size > 2048 * 1024) 194f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 195f3ddee8dSDavid Howells 196f3ddee8dSDavid Howells _enter("%llu", i_size); 197f3ddee8dSDavid Howells 198f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 199f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 200f3ddee8dSDavid Howells */ 201f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 202f3ddee8dSDavid Howells nr_inline = nr_pages; 203f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 204f3ddee8dSDavid Howells nr_inline = 0; 205f3ddee8dSDavid Howells 206f3ddee8dSDavid Howells req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, 207f3ddee8dSDavid Howells GFP_KERNEL); 208f3ddee8dSDavid Howells if (!req) 209f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 210f3ddee8dSDavid Howells 211f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 212f3ddee8dSDavid Howells req->nr_pages = nr_pages; 213f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 214f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 215f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 216f3ddee8dSDavid Howells if (nr_inline > 0) { 217f3ddee8dSDavid Howells req->pages = req->array; 218f3ddee8dSDavid Howells } else { 219f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 220f3ddee8dSDavid Howells GFP_KERNEL); 221f3ddee8dSDavid Howells if (!req->pages) 222f3ddee8dSDavid Howells goto error; 223f3ddee8dSDavid Howells } 224f3ddee8dSDavid Howells 225f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 226f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 227f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 228f3ddee8dSDavid Howells * need to reread the entire directory contents. 229f3ddee8dSDavid Howells */ 230f3ddee8dSDavid Howells i = 0; 231f3ddee8dSDavid Howells do { 232f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 233f3ddee8dSDavid Howells req->nr_pages - i, 234f3ddee8dSDavid Howells req->pages + i); 235f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 236f3ddee8dSDavid Howells if (n == 0) { 237f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 238f3ddee8dSDavid Howells 239f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 240f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 241f3ddee8dSDavid Howells 242f3ddee8dSDavid Howells ret = -ENOMEM; 243f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 244f3ddee8dSDavid Howells if (!req->pages[i]) 245f3ddee8dSDavid Howells goto error; 246f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 247f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 248f3ddee8dSDavid Howells i, gfp); 249f3ddee8dSDavid Howells if (ret < 0) 250f3ddee8dSDavid Howells goto error; 251f3ddee8dSDavid Howells 252f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 253f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 254f3ddee8dSDavid Howells unlock_page(req->pages[i]); 255f3ddee8dSDavid Howells i++; 256f3ddee8dSDavid Howells } else { 257f3ddee8dSDavid Howells i += n; 258f3ddee8dSDavid Howells } 259f3ddee8dSDavid Howells } while (i < req->nr_pages); 260f3ddee8dSDavid Howells 261f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 262f3ddee8dSDavid Howells * races. 263f3ddee8dSDavid Howells */ 264f3ddee8dSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 265f3ddee8dSDavid Howells ret = -ERESTARTSYS; 266f3ddee8dSDavid Howells for (i = 0; i < req->nr_pages; i++) 267f3ddee8dSDavid Howells if (lock_page_killable(req->pages[i]) < 0) 268f3ddee8dSDavid Howells goto error_unlock; 269f3ddee8dSDavid Howells 270f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 271f3ddee8dSDavid Howells goto success; 272f3ddee8dSDavid Howells 273f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 274f3ddee8dSDavid Howells if (ret < 0) 275f3ddee8dSDavid Howells goto error_unlock_all; 276f3ddee8dSDavid Howells 277f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 278f3ddee8dSDavid Howells 279f3ddee8dSDavid Howells if (req->len < req->file_size) 280f3ddee8dSDavid Howells goto content_has_grown; 281f3ddee8dSDavid Howells 282f3ddee8dSDavid Howells /* Validate the data we just read. */ 283f3ddee8dSDavid Howells ret = -EIO; 284f3ddee8dSDavid Howells for (i = 0; i < req->nr_pages; i++) 285f3ddee8dSDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], 286f3ddee8dSDavid Howells req->actual_len)) 287f3ddee8dSDavid Howells goto error_unlock_all; 288f3ddee8dSDavid Howells 289f3ddee8dSDavid Howells // TODO: Trim excess pages 290f3ddee8dSDavid Howells 291f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 292f3ddee8dSDavid Howells } 293f3ddee8dSDavid Howells 294f3ddee8dSDavid Howells success: 295f3ddee8dSDavid Howells i = req->nr_pages; 296f3ddee8dSDavid Howells while (i > 0) 297f3ddee8dSDavid Howells unlock_page(req->pages[--i]); 298f3ddee8dSDavid Howells return req; 299f3ddee8dSDavid Howells 300f3ddee8dSDavid Howells error_unlock_all: 301f3ddee8dSDavid Howells i = req->nr_pages; 302f3ddee8dSDavid Howells error_unlock: 303f3ddee8dSDavid Howells while (i > 0) 304f3ddee8dSDavid Howells unlock_page(req->pages[--i]); 305f3ddee8dSDavid Howells error: 306f3ddee8dSDavid Howells afs_put_read(req); 307f3ddee8dSDavid Howells _leave(" = %d", ret); 308f3ddee8dSDavid Howells return ERR_PTR(ret); 309f3ddee8dSDavid Howells 310f3ddee8dSDavid Howells content_has_grown: 311f3ddee8dSDavid Howells i = req->nr_pages; 312f3ddee8dSDavid Howells while (i > 0) 313f3ddee8dSDavid Howells unlock_page(req->pages[--i]); 314f3ddee8dSDavid Howells afs_put_read(req); 315f3ddee8dSDavid Howells goto retry; 316f3ddee8dSDavid Howells } 317f3ddee8dSDavid Howells 318f3ddee8dSDavid Howells /* 3191da177e4SLinus Torvalds * deal with one block in an AFS directory 3201da177e4SLinus Torvalds */ 3211bbae9f8SAl Viro static int afs_dir_iterate_block(struct dir_context *ctx, 32200317636SDavid Howells union afs_xdr_dir_block *block, 3231bbae9f8SAl Viro unsigned blkoff) 3241da177e4SLinus Torvalds { 32500317636SDavid Howells union afs_xdr_dirent *dire; 3261da177e4SLinus Torvalds unsigned offset, next, curr; 3271da177e4SLinus Torvalds size_t nlen; 3281bbae9f8SAl Viro int tmp; 3291da177e4SLinus Torvalds 3301bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3311da177e4SLinus Torvalds 33200317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3354ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3364ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3371da177e4SLinus Torvalds offset = next 3381da177e4SLinus Torvalds ) { 3391da177e4SLinus Torvalds next = offset + 1; 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 34200317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3431da177e4SLinus Torvalds (1 << (offset % 8)))) { 3445b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 34500317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3461da177e4SLinus Torvalds if (offset >= curr) 3471bbae9f8SAl Viro ctx->pos = blkoff + 34800317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3491da177e4SLinus Torvalds continue; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds /* got a valid entry */ 3531da177e4SLinus Torvalds dire = &block->dirents[offset]; 3541da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3551da177e4SLinus Torvalds sizeof(*block) - 35600317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3571da177e4SLinus Torvalds 3585b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 35900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3601da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3611da177e4SLinus Torvalds nlen, dire->u.name); 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds /* work out where the next possible entry is */ 36400317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3654ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 3665b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3671da177e4SLinus Torvalds " %u travelled beyond end dir block" 3685b5e0928SAlexey Dobriyan " (len %u/%zu)", 36900317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 3701da177e4SLinus Torvalds offset, next, tmp, nlen); 3711da177e4SLinus Torvalds return -EIO; 3721da177e4SLinus Torvalds } 37300317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 3741da177e4SLinus Torvalds (1 << (next % 8)))) { 3755b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3765b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 37700317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 3781da177e4SLinus Torvalds offset, next, tmp, nlen); 3791da177e4SLinus Torvalds return -EIO; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3825b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 38300317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 3841da177e4SLinus Torvalds next, tmp, nlen); 3851da177e4SLinus Torvalds next++; 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds /* skip if starts before the current position */ 3891da177e4SLinus Torvalds if (offset < curr) 3901da177e4SLinus Torvalds continue; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds /* found the next entry */ 3931bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 3941da177e4SLinus Torvalds ntohl(dire->u.vnode), 3955cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 3965cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 3971bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 3981da177e4SLinus Torvalds _leave(" = 0 [full]"); 3991da177e4SLinus Torvalds return 0; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 40200317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds _leave(" = 1 [more]"); 4061da177e4SLinus Torvalds return 1; 407ec26815aSDavid Howells } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds /* 41008e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4111da177e4SLinus Torvalds */ 4121bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4131bbae9f8SAl Viro struct key *key) 4141da177e4SLinus Torvalds { 415f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 41600317636SDavid Howells struct afs_xdr_dir_page *dbuf; 41700317636SDavid Howells union afs_xdr_dir_block *dblock; 418f3ddee8dSDavid Howells struct afs_read *req; 4191da177e4SLinus Torvalds struct page *page; 4201da177e4SLinus Torvalds unsigned blkoff, limit; 4211da177e4SLinus Torvalds int ret; 4221da177e4SLinus Torvalds 4231bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4241da177e4SLinus Torvalds 42508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4261da177e4SLinus Torvalds _leave(" = -ESTALE"); 4271da177e4SLinus Torvalds return -ESTALE; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 430f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 431f3ddee8dSDavid Howells if (IS_ERR(req)) 432f3ddee8dSDavid Howells return PTR_ERR(req); 433f3ddee8dSDavid Howells 4341da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 43500317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 43600317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4391da177e4SLinus Torvalds ret = 0; 440f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 44100317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4421da177e4SLinus Torvalds 443f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 444f3ddee8dSDavid Howells * to the LRU. 445f3ddee8dSDavid Howells */ 446f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 447f3ddee8dSDavid Howells if (!page) { 448f3ddee8dSDavid Howells ret = -EIO; 4491da177e4SLinus Torvalds break; 4501da177e4SLinus Torvalds } 451f3ddee8dSDavid Howells mark_page_accessed(page); 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4541da177e4SLinus Torvalds 455f3ddee8dSDavid Howells dbuf = kmap(page); 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4581da177e4SLinus Torvalds do { 4591da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 46000317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 4611bbae9f8SAl Viro ret = afs_dir_iterate_block(ctx, dblock, blkoff); 4621da177e4SLinus Torvalds if (ret != 1) { 463f3ddee8dSDavid Howells kunmap(page); 4641da177e4SLinus Torvalds goto out; 4651da177e4SLinus Torvalds } 4661da177e4SLinus Torvalds 46700317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 4681da177e4SLinus Torvalds 4691bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 4701da177e4SLinus Torvalds 471f3ddee8dSDavid Howells kunmap(page); 4721da177e4SLinus Torvalds ret = 0; 4731da177e4SLinus Torvalds } 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds out: 476f3ddee8dSDavid Howells afs_put_read(req); 4771da177e4SLinus Torvalds _leave(" = %d", ret); 4781da177e4SLinus Torvalds return ret; 479ec26815aSDavid Howells } 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* 4821da177e4SLinus Torvalds * read an AFS directory 4831da177e4SLinus Torvalds */ 4841bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 4851da177e4SLinus Torvalds { 486215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 487ec26815aSDavid Howells } 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds /* 4905cf9dd55SDavid Howells * Search the directory for a single name 4911da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4921da177e4SLinus Torvalds * uniquifier through dtype 4931da177e4SLinus Torvalds */ 4945cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 495ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 4961da177e4SLinus Torvalds { 4975cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 4985cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 4991da177e4SLinus Torvalds 5001bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 5011bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 502ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5031da177e4SLinus Torvalds 50408e0e7c8SDavid Howells /* insanity checks first */ 50500317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 50600317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 50708e0e7c8SDavid Howells 5081bbae9f8SAl Viro if (cookie->name.len != nlen || 5091bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5101da177e4SLinus Torvalds _leave(" = 0 [no]"); 5111da177e4SLinus Torvalds return 0; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds cookie->fid.vnode = ino; 5151da177e4SLinus Torvalds cookie->fid.unique = dtype; 5161da177e4SLinus Torvalds cookie->found = 1; 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds _leave(" = -1 [found]"); 5191da177e4SLinus Torvalds return -1; 520ec26815aSDavid Howells } 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds /* 5235cf9dd55SDavid Howells * Do a lookup of a single name in a directory 524260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5251da177e4SLinus Torvalds */ 5265cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 52700d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 5281da177e4SLinus Torvalds { 5291bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5305cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5315cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5321bbae9f8SAl Viro .name = dentry->d_name, 5331bbae9f8SAl Viro .fid.vid = as->volume->vid 5341bbae9f8SAl Viro }; 5351da177e4SLinus Torvalds int ret; 5361da177e4SLinus Torvalds 537a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds /* search the directory */ 5401bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 5411da177e4SLinus Torvalds if (ret < 0) { 54208e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 54308e0e7c8SDavid Howells return ret; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds ret = -ENOENT; 5471da177e4SLinus Torvalds if (!cookie.found) { 54808e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 54908e0e7c8SDavid Howells return -ENOENT; 55008e0e7c8SDavid Howells } 55108e0e7c8SDavid Howells 55208e0e7c8SDavid Howells *fid = cookie.fid; 55308e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 55408e0e7c8SDavid Howells return 0; 55508e0e7c8SDavid Howells } 55608e0e7c8SDavid Howells 55708e0e7c8SDavid Howells /* 5585cf9dd55SDavid Howells * search the directory for a name 5595cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5605cf9dd55SDavid Howells * uniquifier through dtype 5615cf9dd55SDavid Howells */ 5625cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5635cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5645cf9dd55SDavid Howells { 5655cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 5665cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 5675cf9dd55SDavid Howells int ret; 5685cf9dd55SDavid Howells 5695cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 5705cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 5715cf9dd55SDavid Howells (unsigned long long) ino, dtype); 5725cf9dd55SDavid Howells 5735cf9dd55SDavid Howells /* insanity checks first */ 57400317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 57500317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 5765cf9dd55SDavid Howells 5775cf9dd55SDavid Howells if (cookie->found) { 5785cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 5795cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 5805cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 5815cf9dd55SDavid Howells cookie->nr_fids++; 5825cf9dd55SDavid Howells } 5835cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 5845cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 5855cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 5865cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 5875cf9dd55SDavid Howells cookie->found = 1; 5885cf9dd55SDavid Howells if (cookie->one_only) 5895cf9dd55SDavid Howells return -1; 5905cf9dd55SDavid Howells } 5915cf9dd55SDavid Howells 5925cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 5935cf9dd55SDavid Howells _leave(" = %d", ret); 5945cf9dd55SDavid Howells return ret; 5955cf9dd55SDavid Howells } 5965cf9dd55SDavid Howells 5975cf9dd55SDavid Howells /* 5985cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 5995cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 6005cf9dd55SDavid Howells * asked for is returned. 6015cf9dd55SDavid Howells */ 6025cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6035cf9dd55SDavid Howells struct key *key) 6045cf9dd55SDavid Howells { 6055cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 6065cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 6075cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 6085cf9dd55SDavid Howells struct afs_iget_data data; 6095cf9dd55SDavid Howells struct afs_fs_cursor fc; 6105cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 6115cf9dd55SDavid Howells struct inode *inode = NULL; 6125cf9dd55SDavid Howells int ret, i; 6135cf9dd55SDavid Howells 6145cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6155cf9dd55SDavid Howells 6165cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6175cf9dd55SDavid Howells if (!cookie) 6185cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6195cf9dd55SDavid Howells 6205cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6215cf9dd55SDavid Howells cookie->name = dentry->d_name; 6225cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6235cf9dd55SDavid Howells 6245cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 6255cf9dd55SDavid Howells if (dvnode->cb_interest && 6265cf9dd55SDavid Howells dvnode->cb_interest->server && 6275cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 6285cf9dd55SDavid Howells cookie->one_only = true; 6295cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6305cf9dd55SDavid Howells 6315cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6325cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6335cf9dd55SDavid Howells 6345cf9dd55SDavid Howells /* search the directory */ 6355cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 6365cf9dd55SDavid Howells if (ret < 0) { 6375cf9dd55SDavid Howells inode = ERR_PTR(ret); 6385cf9dd55SDavid Howells goto out; 6395cf9dd55SDavid Howells } 6405cf9dd55SDavid Howells 6415cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6425cf9dd55SDavid Howells if (!cookie->found) 6435cf9dd55SDavid Howells goto out; 6445cf9dd55SDavid Howells 6455cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 6465cf9dd55SDavid Howells data.volume = dvnode->volume; 6475cf9dd55SDavid Howells data.fid = cookie->fids[0]; 6485cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 6495cf9dd55SDavid Howells if (inode) 6505cf9dd55SDavid Howells goto out; 6515cf9dd55SDavid Howells 6525cf9dd55SDavid Howells /* Need space for examining all the selected files */ 6535cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 6545cf9dd55SDavid Howells cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), 6555cf9dd55SDavid Howells GFP_KERNEL); 6565cf9dd55SDavid Howells if (!cookie->statuses) 6575cf9dd55SDavid Howells goto out; 6585cf9dd55SDavid Howells 6595cf9dd55SDavid Howells cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), 6605cf9dd55SDavid Howells GFP_KERNEL); 6615cf9dd55SDavid Howells if (!cookie->callbacks) 6625cf9dd55SDavid Howells goto out_s; 6635cf9dd55SDavid Howells 6645cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 6655cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 6665cf9dd55SDavid Howells * the whole operation. 6675cf9dd55SDavid Howells */ 6685cf9dd55SDavid Howells if (cookie->one_only) 6695cf9dd55SDavid Howells goto no_inline_bulk_status; 6705cf9dd55SDavid Howells 6715cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 6725cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 6735cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 6745cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 6755cf9dd55SDavid Howells &fc.cbi->server->flags)) { 6765cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 6775cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 6785cf9dd55SDavid Howells break; 6795cf9dd55SDavid Howells } 6805cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 6815cf9dd55SDavid Howells afs_v2net(dvnode), 6825cf9dd55SDavid Howells cookie->fids, 6835cf9dd55SDavid Howells cookie->statuses, 6845cf9dd55SDavid Howells cookie->callbacks, 6855cf9dd55SDavid Howells cookie->nr_fids, NULL); 6865cf9dd55SDavid Howells } 6875cf9dd55SDavid Howells 6885cf9dd55SDavid Howells if (fc.ac.error == 0) 6895cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 6905cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 6915cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 6925cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 6935cf9dd55SDavid Howells } 6945cf9dd55SDavid Howells 6955cf9dd55SDavid Howells if (!IS_ERR(inode)) 6965cf9dd55SDavid Howells goto success; 6975cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 6985cf9dd55SDavid Howells goto out_c; 6995cf9dd55SDavid Howells 7005cf9dd55SDavid Howells no_inline_bulk_status: 7015cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7025cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7035cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7045cf9dd55SDavid Howells */ 7055cf9dd55SDavid Howells cookie->nr_fids = 1; 7065cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 7075cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7085cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7095cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7105cf9dd55SDavid Howells afs_v2net(dvnode), 7115cf9dd55SDavid Howells cookie->fids, 7125cf9dd55SDavid Howells cookie->statuses, 7135cf9dd55SDavid Howells cookie->callbacks, 7145cf9dd55SDavid Howells NULL); 7155cf9dd55SDavid Howells } 7165cf9dd55SDavid Howells 7175cf9dd55SDavid Howells if (fc.ac.error == 0) 7185cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7195cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7205cf9dd55SDavid Howells } 7215cf9dd55SDavid Howells 7225cf9dd55SDavid Howells if (IS_ERR(inode)) 7235cf9dd55SDavid Howells goto out_c; 7245cf9dd55SDavid Howells 7255cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 7265cf9dd55SDavid Howells cookie->statuses[i].abort_code = 0; 7275cf9dd55SDavid Howells 7285cf9dd55SDavid Howells success: 7295cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7305cf9dd55SDavid Howells * one we actually want. 7315cf9dd55SDavid Howells */ 7325cf9dd55SDavid Howells if (cookie->statuses[0].abort_code != 0) 7335cf9dd55SDavid Howells inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); 7345cf9dd55SDavid Howells 7355cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 7365cf9dd55SDavid Howells struct inode *ti; 7375cf9dd55SDavid Howells 7385cf9dd55SDavid Howells if (cookie->statuses[i].abort_code != 0) 7395cf9dd55SDavid Howells continue; 7405cf9dd55SDavid Howells 7415cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 7425cf9dd55SDavid Howells &cookie->statuses[i], 7435cf9dd55SDavid Howells &cookie->callbacks[i], 7445cf9dd55SDavid Howells cbi); 7455cf9dd55SDavid Howells if (i == 0) { 7465cf9dd55SDavid Howells inode = ti; 7475cf9dd55SDavid Howells } else { 7485cf9dd55SDavid Howells if (!IS_ERR(ti)) 7495cf9dd55SDavid Howells iput(ti); 7505cf9dd55SDavid Howells } 7515cf9dd55SDavid Howells } 7525cf9dd55SDavid Howells 7535cf9dd55SDavid Howells out_c: 7545cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 7555cf9dd55SDavid Howells kfree(cookie->callbacks); 7565cf9dd55SDavid Howells out_s: 7575cf9dd55SDavid Howells kfree(cookie->statuses); 7585cf9dd55SDavid Howells out: 7595cf9dd55SDavid Howells kfree(cookie); 7605cf9dd55SDavid Howells return inode; 7615cf9dd55SDavid Howells } 7625cf9dd55SDavid Howells 7635cf9dd55SDavid Howells /* 7646f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 7656f8880d8SDavid Howells */ 7666f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 7676f8880d8SDavid Howells struct key *key) 7686f8880d8SDavid Howells { 7696f8880d8SDavid Howells struct afs_sysnames *subs; 7706f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 7716f8880d8SDavid Howells struct dentry *ret; 7726f8880d8SDavid Howells char *buf, *p, *name; 7736f8880d8SDavid Howells int len, i; 7746f8880d8SDavid Howells 7756f8880d8SDavid Howells _enter(""); 7766f8880d8SDavid Howells 7776f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 7786f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 7796f8880d8SDavid Howells if (!buf) 7806f8880d8SDavid Howells goto out_p; 7816f8880d8SDavid Howells if (dentry->d_name.len > 4) { 7826f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 7836f8880d8SDavid Howells p += dentry->d_name.len - 4; 7846f8880d8SDavid Howells } 7856f8880d8SDavid Howells 7866f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 7876f8880d8SDavid Howells read_lock(&net->sysnames_lock); 7886f8880d8SDavid Howells subs = net->sysnames; 7896f8880d8SDavid Howells refcount_inc(&subs->usage); 7906f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 7916f8880d8SDavid Howells 7926f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 7936f8880d8SDavid Howells name = subs->subs[i]; 7946f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 7956f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 7966f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 7976f8880d8SDavid Howells goto out_s; 7986f8880d8SDavid Howells } 7996f8880d8SDavid Howells 8006f8880d8SDavid Howells strcpy(p, name); 8016f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8026f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8036f8880d8SDavid Howells goto out_s; 8046f8880d8SDavid Howells dput(ret); 8056f8880d8SDavid Howells } 8066f8880d8SDavid Howells 8076f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8086f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8096f8880d8SDavid Howells */ 8106f8880d8SDavid Howells ret = NULL; 8116f8880d8SDavid Howells out_s: 8126f8880d8SDavid Howells afs_put_sysnames(subs); 8136f8880d8SDavid Howells kfree(buf); 8146f8880d8SDavid Howells out_p: 8156f8880d8SDavid Howells key_put(key); 8166f8880d8SDavid Howells return ret; 8176f8880d8SDavid Howells } 8186f8880d8SDavid Howells 8196f8880d8SDavid Howells /* 82008e0e7c8SDavid Howells * look up an entry in a directory 82108e0e7c8SDavid Howells */ 822260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 82300cd8dd3SAl Viro unsigned int flags) 82408e0e7c8SDavid Howells { 8255cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 82608e0e7c8SDavid Howells struct inode *inode; 82700d3b7a4SDavid Howells struct key *key; 82808e0e7c8SDavid Howells int ret; 82908e0e7c8SDavid Howells 830a455589fSAl Viro _enter("{%x:%u},%p{%pd},", 8315cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 832260a9803SDavid Howells 8332b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 83408e0e7c8SDavid Howells 83545222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 83608e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 83708e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 83808e0e7c8SDavid Howells } 83908e0e7c8SDavid Howells 8405cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 84108e0e7c8SDavid Howells _leave(" = -ESTALE"); 84208e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 84308e0e7c8SDavid Howells } 84408e0e7c8SDavid Howells 8455cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 84600d3b7a4SDavid Howells if (IS_ERR(key)) { 84700d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 848e231c2eeSDavid Howells return ERR_CAST(key); 84900d3b7a4SDavid Howells } 85000d3b7a4SDavid Howells 8515cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 85208e0e7c8SDavid Howells if (ret < 0) { 85300d3b7a4SDavid Howells key_put(key); 854260a9803SDavid Howells _leave(" = %d [val]", ret); 8551da177e4SLinus Torvalds return ERR_PTR(ret); 8561da177e4SLinus Torvalds } 8571da177e4SLinus Torvalds 8586f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8596f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8606f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 8616f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 8626f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 8636f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 8646f8880d8SDavid Howells 865d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 8665cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 8675cf9dd55SDavid Howells if (IS_ERR(inode)) { 8685cf9dd55SDavid Howells ret = PTR_ERR(inode); 8694d673da1SDavid Howells if (ret == -ENOENT) { 8705cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 871bec5eb61Swanglei if (!IS_ERR(inode)) { 872bec5eb61Swanglei key_put(key); 873bec5eb61Swanglei goto success; 874bec5eb61Swanglei } 875bec5eb61Swanglei 876bec5eb61Swanglei ret = PTR_ERR(inode); 8774d673da1SDavid Howells } 8784d673da1SDavid Howells 879260a9803SDavid Howells key_put(key); 880260a9803SDavid Howells if (ret == -ENOENT) { 881260a9803SDavid Howells d_add(dentry, NULL); 882260a9803SDavid Howells _leave(" = NULL [negative]"); 883260a9803SDavid Howells return NULL; 884260a9803SDavid Howells } 885260a9803SDavid Howells _leave(" = %d [do]", ret); 886260a9803SDavid Howells return ERR_PTR(ret); 887260a9803SDavid Howells } 8885cf9dd55SDavid Howells dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version; 889260a9803SDavid Howells 8901da177e4SLinus Torvalds /* instantiate the dentry */ 89100d3b7a4SDavid Howells key_put(key); 89208e0e7c8SDavid Howells if (IS_ERR(inode)) { 89308e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 894e231c2eeSDavid Howells return ERR_CAST(inode); 8951da177e4SLinus Torvalds } 8961da177e4SLinus Torvalds 897bec5eb61Swanglei success: 8981da177e4SLinus Torvalds d_add(dentry, inode); 8995cf9dd55SDavid Howells _leave(" = 0 { ino=%lu v=%u }", 9002b0143b5SDavid Howells d_inode(dentry)->i_ino, 9012b0143b5SDavid Howells d_inode(dentry)->i_generation); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds return NULL; 904ec26815aSDavid Howells } 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds /* 9071da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 9081da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 9091da177e4SLinus Torvalds * inode 9101da177e4SLinus Torvalds */ 9110b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 9121da177e4SLinus Torvalds { 913260a9803SDavid Howells struct afs_vnode *vnode, *dir; 914dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 9151da177e4SLinus Torvalds struct dentry *parent; 916c435ee34SDavid Howells struct inode *inode; 91700d3b7a4SDavid Howells struct key *key; 918a4ff7401SDavid Howells long dir_version, de_version; 9191da177e4SLinus Torvalds int ret; 9201da177e4SLinus Torvalds 9210b728e19SAl Viro if (flags & LOOKUP_RCU) 92234286d66SNick Piggin return -ECHILD; 92334286d66SNick Piggin 924c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9252b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 926a455589fSAl Viro _enter("{v={%x:%u} n=%pd fl=%lx},", 927a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 928260a9803SDavid Howells vnode->flags); 929c435ee34SDavid Howells } else { 930a455589fSAl Viro _enter("{neg n=%pd}", dentry); 931c435ee34SDavid Howells } 9321da177e4SLinus Torvalds 933260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 93400d3b7a4SDavid Howells if (IS_ERR(key)) 93500d3b7a4SDavid Howells key = NULL; 93600d3b7a4SDavid Howells 937c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 938c435ee34SDavid Howells inode = d_inode(dentry); 939c435ee34SDavid Howells if (inode) { 940c435ee34SDavid Howells vnode = AFS_FS_I(inode); 941c435ee34SDavid Howells afs_validate(vnode, key); 942c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 943c435ee34SDavid Howells goto out_bad; 944c435ee34SDavid Howells } 945c435ee34SDavid Howells } 946c435ee34SDavid Howells 9471da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 94808e0e7c8SDavid Howells parent = dget_parent(dentry); 9492b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9501da177e4SLinus Torvalds 951260a9803SDavid Howells /* validate the parent directory */ 952260a9803SDavid Howells afs_validate(dir, key); 953260a9803SDavid Howells 954260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 955a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 956c435ee34SDavid Howells goto out_bad_parent; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 959a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 960a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 961a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 962a4ff7401SDavid Howells * version. 963a4ff7401SDavid Howells */ 964a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 965a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 966a4ff7401SDavid Howells if (de_version == dir_version) 967a4ff7401SDavid Howells goto out_valid; 968a4ff7401SDavid Howells 969a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 970a4ff7401SDavid Howells if (de_version - dir_version >= 0) 971a4ff7401SDavid Howells goto out_valid; 972260a9803SDavid Howells 97308e0e7c8SDavid Howells _debug("dir modified"); 974d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds /* search the directory for this vnode */ 9775cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 978260a9803SDavid Howells switch (ret) { 979260a9803SDavid Howells case 0: 980260a9803SDavid Howells /* the filename maps to something */ 9812b0143b5SDavid Howells if (d_really_is_negative(dentry)) 982c435ee34SDavid Howells goto out_bad_parent; 983c435ee34SDavid Howells inode = d_inode(dentry); 984c435ee34SDavid Howells if (is_bad_inode(inode)) { 985a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 986a455589fSAl Viro dentry); 987c435ee34SDavid Howells goto out_bad_parent; 9881da177e4SLinus Torvalds } 9891da177e4SLinus Torvalds 990c435ee34SDavid Howells vnode = AFS_FS_I(inode); 991c435ee34SDavid Howells 9921da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 9931da177e4SLinus Torvalds * different file */ 99408e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 995a455589fSAl Viro _debug("%pd: dirent changed [%u != %u]", 996a455589fSAl Viro dentry, fid.vnode, 99708e0e7c8SDavid Howells vnode->fid.vnode); 9981da177e4SLinus Torvalds goto not_found; 9991da177e4SLinus Torvalds } 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1002260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1003260a9803SDavid Howells * been reused */ 100408e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1005a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1006a455589fSAl Viro dentry, fid.unique, 10077a224228SJean Noel Cordenner vnode->fid.unique, 1008c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1009c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 101008e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1011c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1012260a9803SDavid Howells goto not_found; 1013260a9803SDavid Howells } 1014260a9803SDavid Howells goto out_valid; 1015260a9803SDavid Howells 1016260a9803SDavid Howells case -ENOENT: 1017260a9803SDavid Howells /* the filename is unknown */ 1018a455589fSAl Viro _debug("%pd: dirent not found", dentry); 10192b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1020260a9803SDavid Howells goto not_found; 1021260a9803SDavid Howells goto out_valid; 1022260a9803SDavid Howells 1023260a9803SDavid Howells default: 1024a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1025a455589fSAl Viro parent, ret); 1026c435ee34SDavid Howells goto out_bad_parent; 10271da177e4SLinus Torvalds } 102808e0e7c8SDavid Howells 10291da177e4SLinus Torvalds out_valid: 1030a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10311da177e4SLinus Torvalds dput(parent); 103200d3b7a4SDavid Howells key_put(key); 10331da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10341da177e4SLinus Torvalds return 1; 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10371da177e4SLinus Torvalds not_found: 10381da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10391da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10401da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10411da177e4SLinus Torvalds 1042c435ee34SDavid Howells out_bad_parent: 1043a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10441da177e4SLinus Torvalds dput(parent); 1045c435ee34SDavid Howells out_bad: 104600d3b7a4SDavid Howells key_put(key); 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10491da177e4SLinus Torvalds return 0; 1050ec26815aSDavid Howells } 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds /* 10531da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10541da177e4SLinus Torvalds * sleep) 10551da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10561da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10571da177e4SLinus Torvalds */ 1058fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10591da177e4SLinus Torvalds { 1060a455589fSAl Viro _enter("%pd", dentry); 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10631da177e4SLinus Torvalds goto zap; 10641da177e4SLinus Torvalds 10652b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10662b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10672b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10681da177e4SLinus Torvalds goto zap; 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10711da177e4SLinus Torvalds return 0; 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds zap: 10741da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10751da177e4SLinus Torvalds return 1; 1076ec26815aSDavid Howells } 1077260a9803SDavid Howells 1078260a9803SDavid Howells /* 1079260a9803SDavid Howells * handle dentry release 1080260a9803SDavid Howells */ 108166c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1082260a9803SDavid Howells { 1083a455589fSAl Viro _enter("%pd", dentry); 1084260a9803SDavid Howells } 1085260a9803SDavid Howells 1086260a9803SDavid Howells /* 1087d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1088d2ddc776SDavid Howells */ 1089d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1090d2ddc776SDavid Howells struct dentry *new_dentry, 1091d2ddc776SDavid Howells struct afs_fid *newfid, 1092d2ddc776SDavid Howells struct afs_file_status *newstatus, 1093d2ddc776SDavid Howells struct afs_callback *newcb) 1094d2ddc776SDavid Howells { 1095d2ddc776SDavid Howells struct inode *inode; 1096d2ddc776SDavid Howells 1097d2ddc776SDavid Howells if (fc->ac.error < 0) 1098d2ddc776SDavid Howells return; 1099d2ddc776SDavid Howells 1100bc1527dcSDavid Howells d_drop(new_dentry); 1101bc1527dcSDavid Howells 1102d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1103d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1104d2ddc776SDavid Howells if (IS_ERR(inode)) { 1105d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1106d2ddc776SDavid Howells * the new directory on the server. 1107d2ddc776SDavid Howells */ 1108d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1109d2ddc776SDavid Howells return; 1110d2ddc776SDavid Howells } 1111d2ddc776SDavid Howells 1112bc1527dcSDavid Howells d_add(new_dentry, inode); 1113d2ddc776SDavid Howells } 1114d2ddc776SDavid Howells 1115d2ddc776SDavid Howells /* 1116260a9803SDavid Howells * create a directory on an AFS filesystem 1117260a9803SDavid Howells */ 111818bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1119260a9803SDavid Howells { 1120d2ddc776SDavid Howells struct afs_file_status newstatus; 1121d2ddc776SDavid Howells struct afs_fs_cursor fc; 1122d2ddc776SDavid Howells struct afs_callback newcb; 1123d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1124d2ddc776SDavid Howells struct afs_fid newfid; 1125260a9803SDavid Howells struct key *key; 112663a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1127260a9803SDavid Howells int ret; 1128260a9803SDavid Howells 1129d2ddc776SDavid Howells mode |= S_IFDIR; 1130260a9803SDavid Howells 1131a455589fSAl Viro _enter("{%x:%u},{%pd},%ho", 1132a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1133260a9803SDavid Howells 1134260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1135260a9803SDavid Howells if (IS_ERR(key)) { 1136260a9803SDavid Howells ret = PTR_ERR(key); 1137260a9803SDavid Howells goto error; 1138260a9803SDavid Howells } 1139260a9803SDavid Howells 1140d2ddc776SDavid Howells ret = -ERESTARTSYS; 1141d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1142d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1143d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 114463a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1145d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1146d2ddc776SDavid Howells } 1147d2ddc776SDavid Howells 1148d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1149d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1150d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1151d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1152260a9803SDavid Howells if (ret < 0) 1153d2ddc776SDavid Howells goto error_key; 11544433b691SDavid Howells } else { 11554433b691SDavid Howells goto error_key; 1156260a9803SDavid Howells } 1157260a9803SDavid Howells 115863a4681fSDavid Howells if (ret == 0 && 115963a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 116063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 116163a4681fSDavid Howells afs_edit_dir_for_create); 116263a4681fSDavid Howells 1163260a9803SDavid Howells key_put(key); 1164260a9803SDavid Howells _leave(" = 0"); 1165260a9803SDavid Howells return 0; 1166260a9803SDavid Howells 1167d2ddc776SDavid Howells error_key: 1168260a9803SDavid Howells key_put(key); 1169260a9803SDavid Howells error: 1170260a9803SDavid Howells d_drop(dentry); 1171260a9803SDavid Howells _leave(" = %d", ret); 1172260a9803SDavid Howells return ret; 1173260a9803SDavid Howells } 1174260a9803SDavid Howells 1175260a9803SDavid Howells /* 1176d2ddc776SDavid Howells * Remove a subdir from a directory. 1177260a9803SDavid Howells */ 1178d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1179260a9803SDavid Howells { 11802b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1181d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1182d2ddc776SDavid Howells 1183260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1184260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1185c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 118663a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1187260a9803SDavid Howells } 1188260a9803SDavid Howells } 1189260a9803SDavid Howells 1190260a9803SDavid Howells /* 1191d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1192260a9803SDavid Howells */ 1193d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1194260a9803SDavid Howells { 1195d2ddc776SDavid Howells struct afs_fs_cursor fc; 1196d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1197260a9803SDavid Howells struct key *key; 119863a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1199260a9803SDavid Howells int ret; 1200260a9803SDavid Howells 1201a455589fSAl Viro _enter("{%x:%u},{%pd}", 1202a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1203260a9803SDavid Howells 1204260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1205260a9803SDavid Howells if (IS_ERR(key)) { 1206260a9803SDavid Howells ret = PTR_ERR(key); 1207260a9803SDavid Howells goto error; 1208260a9803SDavid Howells } 1209260a9803SDavid Howells 1210d2ddc776SDavid Howells ret = -ERESTARTSYS; 1211d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1212d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1213d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 121463a4681fSDavid Howells afs_fs_remove(&fc, dentry->d_name.name, true, 121563a4681fSDavid Howells data_version); 1216260a9803SDavid Howells } 1217260a9803SDavid Howells 1218d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1219d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 122063a4681fSDavid Howells if (ret == 0) { 1221d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 122263a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 122363a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 122463a4681fSDavid Howells afs_edit_dir_for_rmdir); 122563a4681fSDavid Howells } 1226260a9803SDavid Howells } 1227260a9803SDavid Howells 1228260a9803SDavid Howells key_put(key); 1229d2ddc776SDavid Howells error: 1230d2ddc776SDavid Howells return ret; 1231d2ddc776SDavid Howells } 1232260a9803SDavid Howells 1233d2ddc776SDavid Howells /* 1234d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1235d2ddc776SDavid Howells * 1236d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1237d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1238d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1239d2ddc776SDavid Howells * 1240d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1241d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1242d2ddc776SDavid Howells */ 1243440fbc3aSDavid Howells static int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1244440fbc3aSDavid Howells unsigned long d_version_before, 1245440fbc3aSDavid Howells unsigned long d_version_after) 1246d2ddc776SDavid Howells { 1247440fbc3aSDavid Howells bool dir_valid; 1248d2ddc776SDavid Howells int ret = 0; 1249d2ddc776SDavid Howells 1250440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1251440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1252440fbc3aSDavid Howells */ 1253440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1254440fbc3aSDavid Howells 1255d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1256d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1257d2ddc776SDavid Howells 1258440fbc3aSDavid Howells if (dir_valid) { 1259440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1260440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1261440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1262440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1263440fbc3aSDavid Howells } 1264440fbc3aSDavid Howells ret = 0; 1265440fbc3aSDavid Howells } else { 1266440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1267440fbc3aSDavid Howells 1268d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1269d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1270d2ddc776SDavid Howells 1271d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1272d2ddc776SDavid Howells if (ret == -ESTALE) 1273d2ddc776SDavid Howells ret = 0; 1274440fbc3aSDavid Howells } 1275d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1276d2ddc776SDavid Howells } 1277d2ddc776SDavid Howells 1278d2ddc776SDavid Howells return ret; 1279d2ddc776SDavid Howells } 1280d2ddc776SDavid Howells 1281d2ddc776SDavid Howells /* 1282d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1283d2ddc776SDavid Howells */ 1284d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1285d2ddc776SDavid Howells { 1286d2ddc776SDavid Howells struct afs_fs_cursor fc; 1287d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 1288d2ddc776SDavid Howells struct key *key; 1289440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 129063a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1291d2ddc776SDavid Howells int ret; 1292d2ddc776SDavid Howells 1293d2ddc776SDavid Howells _enter("{%x:%u},{%pd}", 1294d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1295d2ddc776SDavid Howells 1296d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1297d2ddc776SDavid Howells return -ENAMETOOLONG; 1298d2ddc776SDavid Howells 1299d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1300d2ddc776SDavid Howells if (IS_ERR(key)) { 1301d2ddc776SDavid Howells ret = PTR_ERR(key); 1302d2ddc776SDavid Howells goto error; 1303d2ddc776SDavid Howells } 1304d2ddc776SDavid Howells 1305d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1306d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1307d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1308d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1309d2ddc776SDavid Howells if (ret < 0) 1310d2ddc776SDavid Howells goto error_key; 1311d2ddc776SDavid Howells } 1312d2ddc776SDavid Howells 1313d2ddc776SDavid Howells ret = -ERESTARTSYS; 1314d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1315d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1316d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 131763a4681fSDavid Howells afs_fs_remove(&fc, dentry->d_name.name, false, 131863a4681fSDavid Howells data_version); 1319d2ddc776SDavid Howells } 1320d2ddc776SDavid Howells 1321d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1322d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1323d2ddc776SDavid Howells if (ret == 0) 1324440fbc3aSDavid Howells ret = afs_dir_remove_link( 1325440fbc3aSDavid Howells dentry, key, d_version, 1326440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 132763a4681fSDavid Howells if (ret == 0 && 132863a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 132963a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 133063a4681fSDavid Howells afs_edit_dir_for_unlink); 1331d2ddc776SDavid Howells } 1332d2ddc776SDavid Howells 1333d2ddc776SDavid Howells error_key: 1334260a9803SDavid Howells key_put(key); 1335260a9803SDavid Howells error: 1336260a9803SDavid Howells _leave(" = %d", ret); 1337260a9803SDavid Howells return ret; 1338260a9803SDavid Howells } 1339260a9803SDavid Howells 1340260a9803SDavid Howells /* 1341260a9803SDavid Howells * create a regular file on an AFS filesystem 1342260a9803SDavid Howells */ 13434acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1344ebfc3b49SAl Viro bool excl) 1345260a9803SDavid Howells { 1346d2ddc776SDavid Howells struct afs_fs_cursor fc; 1347d2ddc776SDavid Howells struct afs_file_status newstatus; 1348d2ddc776SDavid Howells struct afs_callback newcb; 134943dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1350d2ddc776SDavid Howells struct afs_fid newfid; 1351260a9803SDavid Howells struct key *key; 135263a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1353260a9803SDavid Howells int ret; 1354260a9803SDavid Howells 1355d2ddc776SDavid Howells mode |= S_IFREG; 1356260a9803SDavid Howells 1357a455589fSAl Viro _enter("{%x:%u},{%pd},%ho,", 1358a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1359260a9803SDavid Howells 1360d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1361d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1362d2ddc776SDavid Howells goto error; 1363d2ddc776SDavid Howells 1364260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1365260a9803SDavid Howells if (IS_ERR(key)) { 1366260a9803SDavid Howells ret = PTR_ERR(key); 1367260a9803SDavid Howells goto error; 1368260a9803SDavid Howells } 1369260a9803SDavid Howells 1370d2ddc776SDavid Howells ret = -ERESTARTSYS; 1371d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1372d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1373d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 137463a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1375d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1376d2ddc776SDavid Howells } 1377d2ddc776SDavid Howells 1378d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1379d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1380d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1381d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1382260a9803SDavid Howells if (ret < 0) 1383d2ddc776SDavid Howells goto error_key; 13844433b691SDavid Howells } else { 13854433b691SDavid Howells goto error_key; 1386260a9803SDavid Howells } 1387260a9803SDavid Howells 138863a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 138963a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 139063a4681fSDavid Howells afs_edit_dir_for_create); 139163a4681fSDavid Howells 1392260a9803SDavid Howells key_put(key); 1393260a9803SDavid Howells _leave(" = 0"); 1394260a9803SDavid Howells return 0; 1395260a9803SDavid Howells 1396d2ddc776SDavid Howells error_key: 1397260a9803SDavid Howells key_put(key); 1398260a9803SDavid Howells error: 1399260a9803SDavid Howells d_drop(dentry); 1400260a9803SDavid Howells _leave(" = %d", ret); 1401260a9803SDavid Howells return ret; 1402260a9803SDavid Howells } 1403260a9803SDavid Howells 1404260a9803SDavid Howells /* 1405260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1406260a9803SDavid Howells */ 1407260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1408260a9803SDavid Howells struct dentry *dentry) 1409260a9803SDavid Howells { 1410d2ddc776SDavid Howells struct afs_fs_cursor fc; 1411260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1412260a9803SDavid Howells struct key *key; 141363a4681fSDavid Howells u64 data_version; 1414260a9803SDavid Howells int ret; 1415260a9803SDavid Howells 14162b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1417260a9803SDavid Howells dvnode = AFS_FS_I(dir); 141863a4681fSDavid Howells data_version = dvnode->status.data_version; 1419260a9803SDavid Howells 1420a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%pd}", 1421260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1422260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1423a455589fSAl Viro dentry); 1424260a9803SDavid Howells 1425d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1426d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1427d2ddc776SDavid Howells goto error; 1428d2ddc776SDavid Howells 1429260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1430260a9803SDavid Howells if (IS_ERR(key)) { 1431260a9803SDavid Howells ret = PTR_ERR(key); 1432260a9803SDavid Howells goto error; 1433260a9803SDavid Howells } 1434260a9803SDavid Howells 1435d2ddc776SDavid Howells ret = -ERESTARTSYS; 1436d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1437d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1438d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1439bc1527dcSDavid Howells goto error_key; 1440d2ddc776SDavid Howells } 1441260a9803SDavid Howells 1442d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1443d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1444d2ddc776SDavid Howells fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; 144563a4681fSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); 1446d2ddc776SDavid Howells } 1447d2ddc776SDavid Howells 1448d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1449d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 14507de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1451260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1452d2ddc776SDavid Howells 1453d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1454d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1455d2ddc776SDavid Howells if (ret < 0) 1456d2ddc776SDavid Howells goto error_key; 14574433b691SDavid Howells } else { 14584433b691SDavid Howells goto error_key; 1459d2ddc776SDavid Howells } 1460d2ddc776SDavid Howells 146163a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 146263a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 146363a4681fSDavid Howells afs_edit_dir_for_link); 146463a4681fSDavid Howells 1465260a9803SDavid Howells key_put(key); 1466260a9803SDavid Howells _leave(" = 0"); 1467260a9803SDavid Howells return 0; 1468260a9803SDavid Howells 1469d2ddc776SDavid Howells error_key: 1470260a9803SDavid Howells key_put(key); 1471260a9803SDavid Howells error: 1472260a9803SDavid Howells d_drop(dentry); 1473260a9803SDavid Howells _leave(" = %d", ret); 1474260a9803SDavid Howells return ret; 1475260a9803SDavid Howells } 1476260a9803SDavid Howells 1477260a9803SDavid Howells /* 1478260a9803SDavid Howells * create a symlink in an AFS filesystem 1479260a9803SDavid Howells */ 1480260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1481260a9803SDavid Howells const char *content) 1482260a9803SDavid Howells { 1483d2ddc776SDavid Howells struct afs_fs_cursor fc; 1484d2ddc776SDavid Howells struct afs_file_status newstatus; 1485d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1486d2ddc776SDavid Howells struct afs_fid newfid; 1487260a9803SDavid Howells struct key *key; 148863a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1489260a9803SDavid Howells int ret; 1490260a9803SDavid Howells 1491a455589fSAl Viro _enter("{%x:%u},{%pd},%s", 1492a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1493260a9803SDavid Howells content); 1494260a9803SDavid Howells 1495d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1496d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1497d2ddc776SDavid Howells goto error; 1498d2ddc776SDavid Howells 1499260a9803SDavid Howells ret = -EINVAL; 150045222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1501260a9803SDavid Howells goto error; 1502260a9803SDavid Howells 1503260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1504260a9803SDavid Howells if (IS_ERR(key)) { 1505260a9803SDavid Howells ret = PTR_ERR(key); 1506260a9803SDavid Howells goto error; 1507260a9803SDavid Howells } 1508260a9803SDavid Howells 1509d2ddc776SDavid Howells ret = -ERESTARTSYS; 1510d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1511d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1512d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 151363a4681fSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, 151463a4681fSDavid Howells content, data_version, 1515d2ddc776SDavid Howells &newfid, &newstatus); 1516d2ddc776SDavid Howells } 1517d2ddc776SDavid Howells 1518d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1519d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1520d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1521d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1522260a9803SDavid Howells if (ret < 0) 1523d2ddc776SDavid Howells goto error_key; 15244433b691SDavid Howells } else { 15254433b691SDavid Howells goto error_key; 1526260a9803SDavid Howells } 1527260a9803SDavid Howells 152863a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 152963a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 153063a4681fSDavid Howells afs_edit_dir_for_symlink); 153163a4681fSDavid Howells 1532260a9803SDavid Howells key_put(key); 1533260a9803SDavid Howells _leave(" = 0"); 1534260a9803SDavid Howells return 0; 1535260a9803SDavid Howells 1536d2ddc776SDavid Howells error_key: 1537260a9803SDavid Howells key_put(key); 1538260a9803SDavid Howells error: 1539260a9803SDavid Howells d_drop(dentry); 1540260a9803SDavid Howells _leave(" = %d", ret); 1541260a9803SDavid Howells return ret; 1542260a9803SDavid Howells } 1543260a9803SDavid Howells 1544260a9803SDavid Howells /* 1545260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1546260a9803SDavid Howells */ 1547260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 15481cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 15491cd66c93SMiklos Szeredi unsigned int flags) 1550260a9803SDavid Howells { 1551d2ddc776SDavid Howells struct afs_fs_cursor fc; 1552260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1553260a9803SDavid Howells struct key *key; 155463a4681fSDavid Howells u64 orig_data_version, new_data_version; 155563a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1556260a9803SDavid Howells int ret; 1557260a9803SDavid Howells 15581cd66c93SMiklos Szeredi if (flags) 15591cd66c93SMiklos Szeredi return -EINVAL; 15601cd66c93SMiklos Szeredi 15612b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1562260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1563260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 156463a4681fSDavid Howells orig_data_version = orig_dvnode->status.data_version; 156563a4681fSDavid Howells new_data_version = new_dvnode->status.data_version; 1566260a9803SDavid Howells 1567a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1568260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1569260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1570260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1571a455589fSAl Viro new_dentry); 1572260a9803SDavid Howells 1573260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1574260a9803SDavid Howells if (IS_ERR(key)) { 1575260a9803SDavid Howells ret = PTR_ERR(key); 1576260a9803SDavid Howells goto error; 1577260a9803SDavid Howells } 1578260a9803SDavid Howells 1579d2ddc776SDavid Howells ret = -ERESTARTSYS; 1580d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1581d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1582d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1583d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1584bc1527dcSDavid Howells goto error_key; 1585d2ddc776SDavid Howells } 1586d2ddc776SDavid Howells } 1587d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1588d2ddc776SDavid Howells fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; 1589d2ddc776SDavid Howells fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; 1590d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 159163a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 159263a4681fSDavid Howells orig_data_version, new_data_version); 1593d2ddc776SDavid Howells } 1594d2ddc776SDavid Howells 1595d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1596d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1597d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1598d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1599d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1600260a9803SDavid Howells if (ret < 0) 1601d2ddc776SDavid Howells goto error_key; 1602d2ddc776SDavid Howells } 1603d2ddc776SDavid Howells 160463a4681fSDavid Howells if (ret == 0) { 160563a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 160663a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 160763a4681fSDavid Howells afs_edit_dir_for_rename); 160863a4681fSDavid Howells 160963a4681fSDavid Howells if (!new_negative && 161063a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 161163a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 161263a4681fSDavid Howells afs_edit_dir_for_rename); 161363a4681fSDavid Howells 161463a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 161563a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 161663a4681fSDavid Howells &vnode->fid, afs_edit_dir_for_rename); 161763a4681fSDavid Howells } 161863a4681fSDavid Howells 1619d2ddc776SDavid Howells error_key: 1620260a9803SDavid Howells key_put(key); 1621260a9803SDavid Howells error: 1622260a9803SDavid Howells _leave(" = %d", ret); 1623260a9803SDavid Howells return ret; 1624260a9803SDavid Howells } 1625f3ddee8dSDavid Howells 1626f3ddee8dSDavid Howells /* 1627f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1628f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1629f3ddee8dSDavid Howells */ 1630f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1631f3ddee8dSDavid Howells { 1632f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1633f3ddee8dSDavid Howells 1634f3ddee8dSDavid Howells _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1635f3ddee8dSDavid Howells 1636f3ddee8dSDavid Howells set_page_private(page, 0); 1637f3ddee8dSDavid Howells ClearPagePrivate(page); 1638f3ddee8dSDavid Howells 1639f3ddee8dSDavid Howells /* The directory will need reloading. */ 1640f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1641f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1642f3ddee8dSDavid Howells return 1; 1643f3ddee8dSDavid Howells } 1644f3ddee8dSDavid Howells 1645f3ddee8dSDavid Howells /* 1646f3ddee8dSDavid Howells * invalidate part or all of a page 1647f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1648f3ddee8dSDavid Howells * the entire page) 1649f3ddee8dSDavid Howells */ 1650f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1651f3ddee8dSDavid Howells unsigned int length) 1652f3ddee8dSDavid Howells { 1653f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1654f3ddee8dSDavid Howells 1655f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1656f3ddee8dSDavid Howells 1657f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1658f3ddee8dSDavid Howells 1659f3ddee8dSDavid Howells /* The directory will need reloading. */ 1660f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1661f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1662f3ddee8dSDavid Howells 1663f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1664f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1665f3ddee8dSDavid Howells set_page_private(page, 0); 1666f3ddee8dSDavid Howells ClearPagePrivate(page); 1667f3ddee8dSDavid Howells } 1668f3ddee8dSDavid Howells } 1669