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) 183b61f7dcfSDavid Howells __acquires(&dvnode->validate_lock) 184f3ddee8dSDavid Howells { 185f3ddee8dSDavid Howells struct afs_read *req; 186f3ddee8dSDavid Howells loff_t i_size; 187f3ddee8dSDavid Howells int nr_pages, nr_inline, i, n; 188f3ddee8dSDavid Howells int ret = -ENOMEM; 189f3ddee8dSDavid Howells 190f3ddee8dSDavid Howells retry: 191f3ddee8dSDavid Howells i_size = i_size_read(&dvnode->vfs_inode); 192f3ddee8dSDavid Howells if (i_size < 2048) 193f3ddee8dSDavid Howells return ERR_PTR(-EIO); 194f3ddee8dSDavid Howells if (i_size > 2048 * 1024) 195f3ddee8dSDavid Howells return ERR_PTR(-EFBIG); 196f3ddee8dSDavid Howells 197f3ddee8dSDavid Howells _enter("%llu", i_size); 198f3ddee8dSDavid Howells 199f3ddee8dSDavid Howells /* Get a request record to hold the page list. We want to hold it 200f3ddee8dSDavid Howells * inline if we can, but we don't want to make an order 1 allocation. 201f3ddee8dSDavid Howells */ 202f3ddee8dSDavid Howells nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 203f3ddee8dSDavid Howells nr_inline = nr_pages; 204f3ddee8dSDavid Howells if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *)) 205f3ddee8dSDavid Howells nr_inline = 0; 206f3ddee8dSDavid Howells 207f3ddee8dSDavid Howells req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline, 208f3ddee8dSDavid Howells GFP_KERNEL); 209f3ddee8dSDavid Howells if (!req) 210f3ddee8dSDavid Howells return ERR_PTR(-ENOMEM); 211f3ddee8dSDavid Howells 212f3ddee8dSDavid Howells refcount_set(&req->usage, 1); 213f3ddee8dSDavid Howells req->nr_pages = nr_pages; 214f3ddee8dSDavid Howells req->actual_len = i_size; /* May change */ 215f3ddee8dSDavid Howells req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 216f3ddee8dSDavid Howells req->data_version = dvnode->status.data_version; /* May change */ 217f3ddee8dSDavid Howells if (nr_inline > 0) { 218f3ddee8dSDavid Howells req->pages = req->array; 219f3ddee8dSDavid Howells } else { 220f3ddee8dSDavid Howells req->pages = kcalloc(nr_pages, sizeof(struct page *), 221f3ddee8dSDavid Howells GFP_KERNEL); 222f3ddee8dSDavid Howells if (!req->pages) 223f3ddee8dSDavid Howells goto error; 224f3ddee8dSDavid Howells } 225f3ddee8dSDavid Howells 226f3ddee8dSDavid Howells /* Get a list of all the pages that hold or will hold the directory 227f3ddee8dSDavid Howells * content. We need to fill in any gaps that we might find where the 228f3ddee8dSDavid Howells * memory reclaimer has been at work. If there are any gaps, we will 229f3ddee8dSDavid Howells * need to reread the entire directory contents. 230f3ddee8dSDavid Howells */ 231f3ddee8dSDavid Howells i = 0; 232f3ddee8dSDavid Howells do { 233f3ddee8dSDavid Howells n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 234f3ddee8dSDavid Howells req->nr_pages - i, 235f3ddee8dSDavid Howells req->pages + i); 236f3ddee8dSDavid Howells _debug("find %u at %u/%u", n, i, req->nr_pages); 237f3ddee8dSDavid Howells if (n == 0) { 238f3ddee8dSDavid Howells gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 239f3ddee8dSDavid Howells 240f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 241f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 242f3ddee8dSDavid Howells 243f3ddee8dSDavid Howells ret = -ENOMEM; 244f3ddee8dSDavid Howells req->pages[i] = __page_cache_alloc(gfp); 245f3ddee8dSDavid Howells if (!req->pages[i]) 246f3ddee8dSDavid Howells goto error; 247f3ddee8dSDavid Howells ret = add_to_page_cache_lru(req->pages[i], 248f3ddee8dSDavid Howells dvnode->vfs_inode.i_mapping, 249f3ddee8dSDavid Howells i, gfp); 250f3ddee8dSDavid Howells if (ret < 0) 251f3ddee8dSDavid Howells goto error; 252f3ddee8dSDavid Howells 253f3ddee8dSDavid Howells set_page_private(req->pages[i], 1); 254f3ddee8dSDavid Howells SetPagePrivate(req->pages[i]); 255f3ddee8dSDavid Howells unlock_page(req->pages[i]); 256f3ddee8dSDavid Howells i++; 257f3ddee8dSDavid Howells } else { 258f3ddee8dSDavid Howells i += n; 259f3ddee8dSDavid Howells } 260f3ddee8dSDavid Howells } while (i < req->nr_pages); 261f3ddee8dSDavid Howells 262f3ddee8dSDavid Howells /* If we're going to reload, we need to lock all the pages to prevent 263f3ddee8dSDavid Howells * races. 264f3ddee8dSDavid Howells */ 265f3ddee8dSDavid Howells ret = -ERESTARTSYS; 266b61f7dcfSDavid Howells if (down_read_killable(&dvnode->validate_lock) < 0) 267b61f7dcfSDavid Howells goto error; 268f3ddee8dSDavid Howells 269f3ddee8dSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 270f3ddee8dSDavid Howells goto success; 271f3ddee8dSDavid Howells 272b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 273b61f7dcfSDavid Howells if (down_write_killable(&dvnode->validate_lock) < 0) 274b61f7dcfSDavid Howells goto error; 275b61f7dcfSDavid Howells 276b61f7dcfSDavid Howells if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 277f3ddee8dSDavid Howells ret = afs_fetch_data(dvnode, key, req); 278f3ddee8dSDavid Howells if (ret < 0) 279b61f7dcfSDavid Howells goto error_unlock; 280f3ddee8dSDavid Howells 281f3ddee8dSDavid Howells task_io_account_read(PAGE_SIZE * req->nr_pages); 282f3ddee8dSDavid Howells 283f3ddee8dSDavid Howells if (req->len < req->file_size) 284f3ddee8dSDavid Howells goto content_has_grown; 285f3ddee8dSDavid Howells 286f3ddee8dSDavid Howells /* Validate the data we just read. */ 287f3ddee8dSDavid Howells ret = -EIO; 288f3ddee8dSDavid Howells for (i = 0; i < req->nr_pages; i++) 289f3ddee8dSDavid Howells if (!afs_dir_check_page(dvnode, req->pages[i], 290f3ddee8dSDavid Howells req->actual_len)) 291b61f7dcfSDavid Howells goto error_unlock; 292f3ddee8dSDavid Howells 293f3ddee8dSDavid Howells // TODO: Trim excess pages 294f3ddee8dSDavid Howells 295f3ddee8dSDavid Howells set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 296f3ddee8dSDavid Howells } 297f3ddee8dSDavid Howells 298b61f7dcfSDavid Howells downgrade_write(&dvnode->validate_lock); 299f3ddee8dSDavid Howells success: 300f3ddee8dSDavid Howells return req; 301f3ddee8dSDavid Howells 302f3ddee8dSDavid Howells error_unlock: 303b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 304f3ddee8dSDavid Howells error: 305f3ddee8dSDavid Howells afs_put_read(req); 306f3ddee8dSDavid Howells _leave(" = %d", ret); 307f3ddee8dSDavid Howells return ERR_PTR(ret); 308f3ddee8dSDavid Howells 309f3ddee8dSDavid Howells content_has_grown: 310b61f7dcfSDavid Howells up_write(&dvnode->validate_lock); 311f3ddee8dSDavid Howells afs_put_read(req); 312f3ddee8dSDavid Howells goto retry; 313f3ddee8dSDavid Howells } 314f3ddee8dSDavid Howells 315f3ddee8dSDavid Howells /* 3161da177e4SLinus Torvalds * deal with one block in an AFS directory 3171da177e4SLinus Torvalds */ 3181bbae9f8SAl Viro static int afs_dir_iterate_block(struct dir_context *ctx, 31900317636SDavid Howells union afs_xdr_dir_block *block, 3201bbae9f8SAl Viro unsigned blkoff) 3211da177e4SLinus Torvalds { 32200317636SDavid Howells union afs_xdr_dirent *dire; 3231da177e4SLinus Torvalds unsigned offset, next, curr; 3241da177e4SLinus Torvalds size_t nlen; 3251bbae9f8SAl Viro int tmp; 3261da177e4SLinus Torvalds 3271bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 3281da177e4SLinus Torvalds 32900317636SDavid Howells curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 3324ea219a8SDavid Howells for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 3334ea219a8SDavid Howells offset < AFS_DIR_SLOTS_PER_BLOCK; 3341da177e4SLinus Torvalds offset = next 3351da177e4SLinus Torvalds ) { 3361da177e4SLinus Torvalds next = offset + 1; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 33900317636SDavid Howells if (!(block->hdr.bitmap[offset / 8] & 3401da177e4SLinus Torvalds (1 << (offset % 8)))) { 3415b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 34200317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset); 3431da177e4SLinus Torvalds if (offset >= curr) 3441bbae9f8SAl Viro ctx->pos = blkoff + 34500317636SDavid Howells next * sizeof(union afs_xdr_dirent); 3461da177e4SLinus Torvalds continue; 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* got a valid entry */ 3501da177e4SLinus Torvalds dire = &block->dirents[offset]; 3511da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3521da177e4SLinus Torvalds sizeof(*block) - 35300317636SDavid Howells offset * sizeof(union afs_xdr_dirent)); 3541da177e4SLinus Torvalds 3555b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 35600317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), offset, 3571da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3581da177e4SLinus Torvalds nlen, dire->u.name); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* work out where the next possible entry is */ 36100317636SDavid Howells for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { 3624ea219a8SDavid Howells if (next >= AFS_DIR_SLOTS_PER_BLOCK) { 3635b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3641da177e4SLinus Torvalds " %u travelled beyond end dir block" 3655b5e0928SAlexey Dobriyan " (len %u/%zu)", 36600317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 3671da177e4SLinus Torvalds offset, next, tmp, nlen); 3681da177e4SLinus Torvalds return -EIO; 3691da177e4SLinus Torvalds } 37000317636SDavid Howells if (!(block->hdr.bitmap[next / 8] & 3711da177e4SLinus Torvalds (1 << (next % 8)))) { 3725b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3735b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 37400317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 3751da177e4SLinus Torvalds offset, next, tmp, nlen); 3761da177e4SLinus Torvalds return -EIO; 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3795b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 38000317636SDavid Howells blkoff / sizeof(union afs_xdr_dir_block), 3811da177e4SLinus Torvalds next, tmp, nlen); 3821da177e4SLinus Torvalds next++; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds /* skip if starts before the current position */ 3861da177e4SLinus Torvalds if (offset < curr) 3871da177e4SLinus Torvalds continue; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* found the next entry */ 3901bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 3911da177e4SLinus Torvalds ntohl(dire->u.vnode), 3925cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 3935cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 3941bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 3951da177e4SLinus Torvalds _leave(" = 0 [full]"); 3961da177e4SLinus Torvalds return 0; 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 39900317636SDavid Howells ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds _leave(" = 1 [more]"); 4031da177e4SLinus Torvalds return 1; 404ec26815aSDavid Howells } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* 40708e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 4081da177e4SLinus Torvalds */ 4091bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 4101bbae9f8SAl Viro struct key *key) 4111da177e4SLinus Torvalds { 412f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 41300317636SDavid Howells struct afs_xdr_dir_page *dbuf; 41400317636SDavid Howells union afs_xdr_dir_block *dblock; 415f3ddee8dSDavid Howells struct afs_read *req; 4161da177e4SLinus Torvalds struct page *page; 4171da177e4SLinus Torvalds unsigned blkoff, limit; 4181da177e4SLinus Torvalds int ret; 4191da177e4SLinus Torvalds 4201bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 4211da177e4SLinus Torvalds 42208e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 4231da177e4SLinus Torvalds _leave(" = -ESTALE"); 4241da177e4SLinus Torvalds return -ESTALE; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 427f3ddee8dSDavid Howells req = afs_read_dir(dvnode, key); 428f3ddee8dSDavid Howells if (IS_ERR(req)) 429f3ddee8dSDavid Howells return PTR_ERR(req); 430f3ddee8dSDavid Howells 4311da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 43200317636SDavid Howells ctx->pos += sizeof(union afs_xdr_dirent) - 1; 43300317636SDavid Howells ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds /* walk through the blocks in sequence */ 4361da177e4SLinus Torvalds ret = 0; 437f3ddee8dSDavid Howells while (ctx->pos < req->actual_len) { 43800317636SDavid Howells blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 4391da177e4SLinus Torvalds 440f3ddee8dSDavid Howells /* Fetch the appropriate page from the directory and re-add it 441f3ddee8dSDavid Howells * to the LRU. 442f3ddee8dSDavid Howells */ 443f3ddee8dSDavid Howells page = req->pages[blkoff / PAGE_SIZE]; 444f3ddee8dSDavid Howells if (!page) { 445f3ddee8dSDavid Howells ret = -EIO; 4461da177e4SLinus Torvalds break; 4471da177e4SLinus Torvalds } 448f3ddee8dSDavid Howells mark_page_accessed(page); 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 4511da177e4SLinus Torvalds 452f3ddee8dSDavid Howells dbuf = kmap(page); 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4551da177e4SLinus Torvalds do { 4561da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 45700317636SDavid Howells sizeof(union afs_xdr_dir_block)]; 4581bbae9f8SAl Viro ret = afs_dir_iterate_block(ctx, dblock, blkoff); 4591da177e4SLinus Torvalds if (ret != 1) { 460f3ddee8dSDavid Howells kunmap(page); 4611da177e4SLinus Torvalds goto out; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 46400317636SDavid Howells blkoff += sizeof(union afs_xdr_dir_block); 4651da177e4SLinus Torvalds 4661bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 4671da177e4SLinus Torvalds 468f3ddee8dSDavid Howells kunmap(page); 4691da177e4SLinus Torvalds ret = 0; 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds out: 473b61f7dcfSDavid Howells up_read(&dvnode->validate_lock); 474f3ddee8dSDavid Howells afs_put_read(req); 4751da177e4SLinus Torvalds _leave(" = %d", ret); 4761da177e4SLinus Torvalds return ret; 477ec26815aSDavid Howells } 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds /* 4801da177e4SLinus Torvalds * read an AFS directory 4811da177e4SLinus Torvalds */ 4821bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 4831da177e4SLinus Torvalds { 484215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 485ec26815aSDavid Howells } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* 4885cf9dd55SDavid Howells * Search the directory for a single name 4891da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4901da177e4SLinus Torvalds * uniquifier through dtype 4911da177e4SLinus Torvalds */ 4925cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 493ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 4941da177e4SLinus Torvalds { 4955cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 4965cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 4971da177e4SLinus Torvalds 4981bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 4991bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 500ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 5011da177e4SLinus Torvalds 50208e0e7c8SDavid Howells /* insanity checks first */ 50300317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 50400317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 50508e0e7c8SDavid Howells 5061bbae9f8SAl Viro if (cookie->name.len != nlen || 5071bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 5081da177e4SLinus Torvalds _leave(" = 0 [no]"); 5091da177e4SLinus Torvalds return 0; 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds cookie->fid.vnode = ino; 5131da177e4SLinus Torvalds cookie->fid.unique = dtype; 5141da177e4SLinus Torvalds cookie->found = 1; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds _leave(" = -1 [found]"); 5171da177e4SLinus Torvalds return -1; 518ec26815aSDavid Howells } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /* 5215cf9dd55SDavid Howells * Do a lookup of a single name in a directory 522260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 5231da177e4SLinus Torvalds */ 5245cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 52500d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 5261da177e4SLinus Torvalds { 5271bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 5285cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 5295cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 5301bbae9f8SAl Viro .name = dentry->d_name, 5311bbae9f8SAl Viro .fid.vid = as->volume->vid 5321bbae9f8SAl Viro }; 5331da177e4SLinus Torvalds int ret; 5341da177e4SLinus Torvalds 535a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds /* search the directory */ 5381bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 5391da177e4SLinus Torvalds if (ret < 0) { 54008e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 54108e0e7c8SDavid Howells return ret; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds ret = -ENOENT; 5451da177e4SLinus Torvalds if (!cookie.found) { 54608e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 54708e0e7c8SDavid Howells return -ENOENT; 54808e0e7c8SDavid Howells } 54908e0e7c8SDavid Howells 55008e0e7c8SDavid Howells *fid = cookie.fid; 55108e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 55208e0e7c8SDavid Howells return 0; 55308e0e7c8SDavid Howells } 55408e0e7c8SDavid Howells 55508e0e7c8SDavid Howells /* 5565cf9dd55SDavid Howells * search the directory for a name 5575cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5585cf9dd55SDavid Howells * uniquifier through dtype 5595cf9dd55SDavid Howells */ 5605cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5615cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5625cf9dd55SDavid Howells { 5635cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 5645cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 5655cf9dd55SDavid Howells int ret; 5665cf9dd55SDavid Howells 5675cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 5685cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 5695cf9dd55SDavid Howells (unsigned long long) ino, dtype); 5705cf9dd55SDavid Howells 5715cf9dd55SDavid Howells /* insanity checks first */ 57200317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 57300317636SDavid Howells BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 5745cf9dd55SDavid Howells 5755cf9dd55SDavid Howells if (cookie->found) { 5765cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 5775cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 5785cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 5795cf9dd55SDavid Howells cookie->nr_fids++; 5805cf9dd55SDavid Howells } 5815cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 5825cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 5835cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 5845cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 5855cf9dd55SDavid Howells cookie->found = 1; 5865cf9dd55SDavid Howells if (cookie->one_only) 5875cf9dd55SDavid Howells return -1; 5885cf9dd55SDavid Howells } 5895cf9dd55SDavid Howells 5905cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 5915cf9dd55SDavid Howells _leave(" = %d", ret); 5925cf9dd55SDavid Howells return ret; 5935cf9dd55SDavid Howells } 5945cf9dd55SDavid Howells 5955cf9dd55SDavid Howells /* 5965cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 5975cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 5985cf9dd55SDavid Howells * asked for is returned. 5995cf9dd55SDavid Howells */ 6005cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 6015cf9dd55SDavid Howells struct key *key) 6025cf9dd55SDavid Howells { 6035cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 6045cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 6055cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 6065cf9dd55SDavid Howells struct afs_iget_data data; 6075cf9dd55SDavid Howells struct afs_fs_cursor fc; 6085cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 6095cf9dd55SDavid Howells struct inode *inode = NULL; 6105cf9dd55SDavid Howells int ret, i; 6115cf9dd55SDavid Howells 6125cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 6135cf9dd55SDavid Howells 6145cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 6155cf9dd55SDavid Howells if (!cookie) 6165cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 6175cf9dd55SDavid Howells 6185cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 6195cf9dd55SDavid Howells cookie->name = dentry->d_name; 6205cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 6215cf9dd55SDavid Howells 6225cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 6235cf9dd55SDavid Howells if (dvnode->cb_interest && 6245cf9dd55SDavid Howells dvnode->cb_interest->server && 6255cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 6265cf9dd55SDavid Howells cookie->one_only = true; 6275cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 6285cf9dd55SDavid Howells 6295cf9dd55SDavid Howells for (i = 0; i < 50; i++) 6305cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 6315cf9dd55SDavid Howells 6325cf9dd55SDavid Howells /* search the directory */ 6335cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 6345cf9dd55SDavid Howells if (ret < 0) { 6355cf9dd55SDavid Howells inode = ERR_PTR(ret); 6365cf9dd55SDavid Howells goto out; 6375cf9dd55SDavid Howells } 6385cf9dd55SDavid Howells 6395cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 6405cf9dd55SDavid Howells if (!cookie->found) 6415cf9dd55SDavid Howells goto out; 6425cf9dd55SDavid Howells 6435cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 6445cf9dd55SDavid Howells data.volume = dvnode->volume; 6455cf9dd55SDavid Howells data.fid = cookie->fids[0]; 6465cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 6475cf9dd55SDavid Howells if (inode) 6485cf9dd55SDavid Howells goto out; 6495cf9dd55SDavid Howells 6505cf9dd55SDavid Howells /* Need space for examining all the selected files */ 6515cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 6525cf9dd55SDavid Howells cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), 6535cf9dd55SDavid Howells GFP_KERNEL); 6545cf9dd55SDavid Howells if (!cookie->statuses) 6555cf9dd55SDavid Howells goto out; 6565cf9dd55SDavid Howells 6575cf9dd55SDavid Howells cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), 6585cf9dd55SDavid Howells GFP_KERNEL); 6595cf9dd55SDavid Howells if (!cookie->callbacks) 6605cf9dd55SDavid Howells goto out_s; 6615cf9dd55SDavid Howells 6625cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 6635cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 6645cf9dd55SDavid Howells * the whole operation. 6655cf9dd55SDavid Howells */ 6665cf9dd55SDavid Howells if (cookie->one_only) 6675cf9dd55SDavid Howells goto no_inline_bulk_status; 6685cf9dd55SDavid Howells 6695cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 6705cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 6715cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 6725cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 6735cf9dd55SDavid Howells &fc.cbi->server->flags)) { 6745cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 6755cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 6765cf9dd55SDavid Howells break; 6775cf9dd55SDavid Howells } 6785cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 6795cf9dd55SDavid Howells afs_v2net(dvnode), 6805cf9dd55SDavid Howells cookie->fids, 6815cf9dd55SDavid Howells cookie->statuses, 6825cf9dd55SDavid Howells cookie->callbacks, 6835cf9dd55SDavid Howells cookie->nr_fids, NULL); 6845cf9dd55SDavid Howells } 6855cf9dd55SDavid Howells 6865cf9dd55SDavid Howells if (fc.ac.error == 0) 6875cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 6885cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 6895cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 6905cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 6915cf9dd55SDavid Howells } 6925cf9dd55SDavid Howells 6935cf9dd55SDavid Howells if (!IS_ERR(inode)) 6945cf9dd55SDavid Howells goto success; 6955cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 6965cf9dd55SDavid Howells goto out_c; 6975cf9dd55SDavid Howells 6985cf9dd55SDavid Howells no_inline_bulk_status: 6995cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 7005cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 7015cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 7025cf9dd55SDavid Howells */ 7035cf9dd55SDavid Howells cookie->nr_fids = 1; 7045cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 7055cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 7065cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 7075cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 7085cf9dd55SDavid Howells afs_v2net(dvnode), 7095cf9dd55SDavid Howells cookie->fids, 7105cf9dd55SDavid Howells cookie->statuses, 7115cf9dd55SDavid Howells cookie->callbacks, 7125cf9dd55SDavid Howells NULL); 7135cf9dd55SDavid Howells } 7145cf9dd55SDavid Howells 7155cf9dd55SDavid Howells if (fc.ac.error == 0) 7165cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 7175cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 7185cf9dd55SDavid Howells } 7195cf9dd55SDavid Howells 7205cf9dd55SDavid Howells if (IS_ERR(inode)) 7215cf9dd55SDavid Howells goto out_c; 7225cf9dd55SDavid Howells 7235cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 7245cf9dd55SDavid Howells cookie->statuses[i].abort_code = 0; 7255cf9dd55SDavid Howells 7265cf9dd55SDavid Howells success: 7275cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 7285cf9dd55SDavid Howells * one we actually want. 7295cf9dd55SDavid Howells */ 7305cf9dd55SDavid Howells if (cookie->statuses[0].abort_code != 0) 7315cf9dd55SDavid Howells inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); 7325cf9dd55SDavid Howells 7335cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 7345cf9dd55SDavid Howells struct inode *ti; 7355cf9dd55SDavid Howells 7365cf9dd55SDavid Howells if (cookie->statuses[i].abort_code != 0) 7375cf9dd55SDavid Howells continue; 7385cf9dd55SDavid Howells 7395cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 7405cf9dd55SDavid Howells &cookie->statuses[i], 7415cf9dd55SDavid Howells &cookie->callbacks[i], 7425cf9dd55SDavid Howells cbi); 7435cf9dd55SDavid Howells if (i == 0) { 7445cf9dd55SDavid Howells inode = ti; 7455cf9dd55SDavid Howells } else { 7465cf9dd55SDavid Howells if (!IS_ERR(ti)) 7475cf9dd55SDavid Howells iput(ti); 7485cf9dd55SDavid Howells } 7495cf9dd55SDavid Howells } 7505cf9dd55SDavid Howells 7515cf9dd55SDavid Howells out_c: 7525cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 7535cf9dd55SDavid Howells kfree(cookie->callbacks); 7545cf9dd55SDavid Howells out_s: 7555cf9dd55SDavid Howells kfree(cookie->statuses); 7565cf9dd55SDavid Howells out: 7575cf9dd55SDavid Howells kfree(cookie); 7585cf9dd55SDavid Howells return inode; 7595cf9dd55SDavid Howells } 7605cf9dd55SDavid Howells 7615cf9dd55SDavid Howells /* 7626f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 7636f8880d8SDavid Howells */ 7646f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 7656f8880d8SDavid Howells struct key *key) 7666f8880d8SDavid Howells { 7676f8880d8SDavid Howells struct afs_sysnames *subs; 7686f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 7696f8880d8SDavid Howells struct dentry *ret; 7706f8880d8SDavid Howells char *buf, *p, *name; 7716f8880d8SDavid Howells int len, i; 7726f8880d8SDavid Howells 7736f8880d8SDavid Howells _enter(""); 7746f8880d8SDavid Howells 7756f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 7766f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 7776f8880d8SDavid Howells if (!buf) 7786f8880d8SDavid Howells goto out_p; 7796f8880d8SDavid Howells if (dentry->d_name.len > 4) { 7806f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 7816f8880d8SDavid Howells p += dentry->d_name.len - 4; 7826f8880d8SDavid Howells } 7836f8880d8SDavid Howells 7846f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 7856f8880d8SDavid Howells read_lock(&net->sysnames_lock); 7866f8880d8SDavid Howells subs = net->sysnames; 7876f8880d8SDavid Howells refcount_inc(&subs->usage); 7886f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 7896f8880d8SDavid Howells 7906f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 7916f8880d8SDavid Howells name = subs->subs[i]; 7926f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 7936f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 7946f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 7956f8880d8SDavid Howells goto out_s; 7966f8880d8SDavid Howells } 7976f8880d8SDavid Howells 7986f8880d8SDavid Howells strcpy(p, name); 7996f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8006f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8016f8880d8SDavid Howells goto out_s; 8026f8880d8SDavid Howells dput(ret); 8036f8880d8SDavid Howells } 8046f8880d8SDavid Howells 8056f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8066f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8076f8880d8SDavid Howells */ 8086f8880d8SDavid Howells ret = NULL; 8096f8880d8SDavid Howells out_s: 8106f8880d8SDavid Howells afs_put_sysnames(subs); 8116f8880d8SDavid Howells kfree(buf); 8126f8880d8SDavid Howells out_p: 8136f8880d8SDavid Howells key_put(key); 8146f8880d8SDavid Howells return ret; 8156f8880d8SDavid Howells } 8166f8880d8SDavid Howells 8176f8880d8SDavid Howells /* 81808e0e7c8SDavid Howells * look up an entry in a directory 81908e0e7c8SDavid Howells */ 820260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 82100cd8dd3SAl Viro unsigned int flags) 82208e0e7c8SDavid Howells { 8235cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 82408e0e7c8SDavid Howells struct inode *inode; 82534b2a88fSAl Viro struct dentry *d; 82600d3b7a4SDavid Howells struct key *key; 82708e0e7c8SDavid Howells int ret; 82808e0e7c8SDavid Howells 829a455589fSAl Viro _enter("{%x:%u},%p{%pd},", 8305cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 831260a9803SDavid Howells 8322b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 83308e0e7c8SDavid Howells 83445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 83508e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 83608e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 83708e0e7c8SDavid Howells } 83808e0e7c8SDavid Howells 8395cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 84008e0e7c8SDavid Howells _leave(" = -ESTALE"); 84108e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 84208e0e7c8SDavid Howells } 84308e0e7c8SDavid Howells 8445cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 84500d3b7a4SDavid Howells if (IS_ERR(key)) { 84600d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 847e231c2eeSDavid Howells return ERR_CAST(key); 84800d3b7a4SDavid Howells } 84900d3b7a4SDavid Howells 8505cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 85108e0e7c8SDavid Howells if (ret < 0) { 85200d3b7a4SDavid Howells key_put(key); 853260a9803SDavid Howells _leave(" = %d [val]", ret); 8541da177e4SLinus Torvalds return ERR_PTR(ret); 8551da177e4SLinus Torvalds } 8561da177e4SLinus Torvalds 8576f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8586f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8596f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 8606f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 8616f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 8626f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 8636f8880d8SDavid Howells 864d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 8655cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 86634b2a88fSAl Viro key_put(key); 86734b2a88fSAl Viro if (inode == ERR_PTR(-ENOENT)) { 8685cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 86934b2a88fSAl Viro if (inode == ERR_PTR(-ENOENT)) 87034b2a88fSAl Viro inode = NULL; 87134b2a88fSAl Viro } else { 87234b2a88fSAl Viro dentry->d_fsdata = 87334b2a88fSAl Viro (void *)(unsigned long)dvnode->status.data_version; 874bec5eb61Swanglei } 87534b2a88fSAl Viro d = d_splice_alias(inode, dentry); 87634b2a88fSAl Viro if (!IS_ERR_OR_NULL(d)) 87734b2a88fSAl Viro d->d_fsdata = dentry->d_fsdata; 87834b2a88fSAl Viro return d; 879ec26815aSDavid Howells } 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds /* 8821da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 8831da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 8841da177e4SLinus Torvalds * inode 8851da177e4SLinus Torvalds */ 8860b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 8871da177e4SLinus Torvalds { 888260a9803SDavid Howells struct afs_vnode *vnode, *dir; 889dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 8901da177e4SLinus Torvalds struct dentry *parent; 891c435ee34SDavid Howells struct inode *inode; 89200d3b7a4SDavid Howells struct key *key; 893a4ff7401SDavid Howells long dir_version, de_version; 8941da177e4SLinus Torvalds int ret; 8951da177e4SLinus Torvalds 8960b728e19SAl Viro if (flags & LOOKUP_RCU) 89734286d66SNick Piggin return -ECHILD; 89834286d66SNick Piggin 899c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9002b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 901a455589fSAl Viro _enter("{v={%x:%u} n=%pd fl=%lx},", 902a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 903260a9803SDavid Howells vnode->flags); 904c435ee34SDavid Howells } else { 905a455589fSAl Viro _enter("{neg n=%pd}", dentry); 906c435ee34SDavid Howells } 9071da177e4SLinus Torvalds 908260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 90900d3b7a4SDavid Howells if (IS_ERR(key)) 91000d3b7a4SDavid Howells key = NULL; 91100d3b7a4SDavid Howells 912c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 913c435ee34SDavid Howells inode = d_inode(dentry); 914c435ee34SDavid Howells if (inode) { 915c435ee34SDavid Howells vnode = AFS_FS_I(inode); 916c435ee34SDavid Howells afs_validate(vnode, key); 917c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 918c435ee34SDavid Howells goto out_bad; 919c435ee34SDavid Howells } 920c435ee34SDavid Howells } 921c435ee34SDavid Howells 9221da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 92308e0e7c8SDavid Howells parent = dget_parent(dentry); 9242b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9251da177e4SLinus Torvalds 926260a9803SDavid Howells /* validate the parent directory */ 927260a9803SDavid Howells afs_validate(dir, key); 928260a9803SDavid Howells 929260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 930a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 931c435ee34SDavid Howells goto out_bad_parent; 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds 934a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 935a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 936a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 937a4ff7401SDavid Howells * version. 938a4ff7401SDavid Howells */ 939a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 940a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 941a4ff7401SDavid Howells if (de_version == dir_version) 942a4ff7401SDavid Howells goto out_valid; 943a4ff7401SDavid Howells 944a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 945a4ff7401SDavid Howells if (de_version - dir_version >= 0) 946a4ff7401SDavid Howells goto out_valid; 947260a9803SDavid Howells 94808e0e7c8SDavid Howells _debug("dir modified"); 949d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds /* search the directory for this vnode */ 9525cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 953260a9803SDavid Howells switch (ret) { 954260a9803SDavid Howells case 0: 955260a9803SDavid Howells /* the filename maps to something */ 9562b0143b5SDavid Howells if (d_really_is_negative(dentry)) 957c435ee34SDavid Howells goto out_bad_parent; 958c435ee34SDavid Howells inode = d_inode(dentry); 959c435ee34SDavid Howells if (is_bad_inode(inode)) { 960a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 961a455589fSAl Viro dentry); 962c435ee34SDavid Howells goto out_bad_parent; 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds 965c435ee34SDavid Howells vnode = AFS_FS_I(inode); 966c435ee34SDavid Howells 9671da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 9681da177e4SLinus Torvalds * different file */ 96908e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 970a455589fSAl Viro _debug("%pd: dirent changed [%u != %u]", 971a455589fSAl Viro dentry, fid.vnode, 97208e0e7c8SDavid Howells vnode->fid.vnode); 9731da177e4SLinus Torvalds goto not_found; 9741da177e4SLinus Torvalds } 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 977260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 978260a9803SDavid Howells * been reused */ 97908e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 980a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 981a455589fSAl Viro dentry, fid.unique, 9827a224228SJean Noel Cordenner vnode->fid.unique, 983c435ee34SDavid Howells vnode->vfs_inode.i_generation); 984c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 98508e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 986c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 987260a9803SDavid Howells goto not_found; 988260a9803SDavid Howells } 989260a9803SDavid Howells goto out_valid; 990260a9803SDavid Howells 991260a9803SDavid Howells case -ENOENT: 992260a9803SDavid Howells /* the filename is unknown */ 993a455589fSAl Viro _debug("%pd: dirent not found", dentry); 9942b0143b5SDavid Howells if (d_really_is_positive(dentry)) 995260a9803SDavid Howells goto not_found; 996260a9803SDavid Howells goto out_valid; 997260a9803SDavid Howells 998260a9803SDavid Howells default: 999a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1000a455589fSAl Viro parent, ret); 1001c435ee34SDavid Howells goto out_bad_parent; 10021da177e4SLinus Torvalds } 100308e0e7c8SDavid Howells 10041da177e4SLinus Torvalds out_valid: 1005a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 10061da177e4SLinus Torvalds dput(parent); 100700d3b7a4SDavid Howells key_put(key); 10081da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10091da177e4SLinus Torvalds return 1; 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10121da177e4SLinus Torvalds not_found: 10131da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10141da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10151da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10161da177e4SLinus Torvalds 1017c435ee34SDavid Howells out_bad_parent: 1018a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10191da177e4SLinus Torvalds dput(parent); 1020c435ee34SDavid Howells out_bad: 102100d3b7a4SDavid Howells key_put(key); 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10241da177e4SLinus Torvalds return 0; 1025ec26815aSDavid Howells } 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds /* 10281da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10291da177e4SLinus Torvalds * sleep) 10301da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10311da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10321da177e4SLinus Torvalds */ 1033fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10341da177e4SLinus Torvalds { 1035a455589fSAl Viro _enter("%pd", dentry); 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10381da177e4SLinus Torvalds goto zap; 10391da177e4SLinus Torvalds 10402b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10412b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10422b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10431da177e4SLinus Torvalds goto zap; 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10461da177e4SLinus Torvalds return 0; 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds zap: 10491da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10501da177e4SLinus Torvalds return 1; 1051ec26815aSDavid Howells } 1052260a9803SDavid Howells 1053260a9803SDavid Howells /* 1054260a9803SDavid Howells * handle dentry release 1055260a9803SDavid Howells */ 105666c7e1d3SDavid Howells void afs_d_release(struct dentry *dentry) 1057260a9803SDavid Howells { 1058a455589fSAl Viro _enter("%pd", dentry); 1059260a9803SDavid Howells } 1060260a9803SDavid Howells 1061260a9803SDavid Howells /* 1062d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1063d2ddc776SDavid Howells */ 1064d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1065d2ddc776SDavid Howells struct dentry *new_dentry, 1066d2ddc776SDavid Howells struct afs_fid *newfid, 1067d2ddc776SDavid Howells struct afs_file_status *newstatus, 1068d2ddc776SDavid Howells struct afs_callback *newcb) 1069d2ddc776SDavid Howells { 10705a813276SDavid Howells struct afs_vnode *vnode; 1071d2ddc776SDavid Howells struct inode *inode; 1072d2ddc776SDavid Howells 1073d2ddc776SDavid Howells if (fc->ac.error < 0) 1074d2ddc776SDavid Howells return; 1075d2ddc776SDavid Howells 1076bc1527dcSDavid Howells d_drop(new_dentry); 1077bc1527dcSDavid Howells 1078d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1079d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1080d2ddc776SDavid Howells if (IS_ERR(inode)) { 1081d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1082d2ddc776SDavid Howells * the new directory on the server. 1083d2ddc776SDavid Howells */ 1084d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1085d2ddc776SDavid Howells return; 1086d2ddc776SDavid Howells } 1087d2ddc776SDavid Howells 10885a813276SDavid Howells vnode = AFS_FS_I(inode); 10895a813276SDavid Howells set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1090bc1527dcSDavid Howells d_add(new_dentry, inode); 1091d2ddc776SDavid Howells } 1092d2ddc776SDavid Howells 1093d2ddc776SDavid Howells /* 1094260a9803SDavid Howells * create a directory on an AFS filesystem 1095260a9803SDavid Howells */ 109618bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1097260a9803SDavid Howells { 1098d2ddc776SDavid Howells struct afs_file_status newstatus; 1099d2ddc776SDavid Howells struct afs_fs_cursor fc; 1100d2ddc776SDavid Howells struct afs_callback newcb; 1101d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1102d2ddc776SDavid Howells struct afs_fid newfid; 1103260a9803SDavid Howells struct key *key; 110463a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1105260a9803SDavid Howells int ret; 1106260a9803SDavid Howells 1107d2ddc776SDavid Howells mode |= S_IFDIR; 1108260a9803SDavid Howells 1109a455589fSAl Viro _enter("{%x:%u},{%pd},%ho", 1110a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1111260a9803SDavid Howells 1112260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1113260a9803SDavid Howells if (IS_ERR(key)) { 1114260a9803SDavid Howells ret = PTR_ERR(key); 1115260a9803SDavid Howells goto error; 1116260a9803SDavid Howells } 1117260a9803SDavid Howells 1118d2ddc776SDavid Howells ret = -ERESTARTSYS; 1119d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1120d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 112168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 112263a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1123d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1124d2ddc776SDavid Howells } 1125d2ddc776SDavid Howells 1126d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1127d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1128d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1129d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1130260a9803SDavid Howells if (ret < 0) 1131d2ddc776SDavid Howells goto error_key; 11324433b691SDavid Howells } else { 11334433b691SDavid Howells goto error_key; 1134260a9803SDavid Howells } 1135260a9803SDavid Howells 113663a4681fSDavid Howells if (ret == 0 && 113763a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 113863a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 113963a4681fSDavid Howells afs_edit_dir_for_create); 114063a4681fSDavid Howells 1141260a9803SDavid Howells key_put(key); 1142260a9803SDavid Howells _leave(" = 0"); 1143260a9803SDavid Howells return 0; 1144260a9803SDavid Howells 1145d2ddc776SDavid Howells error_key: 1146260a9803SDavid Howells key_put(key); 1147260a9803SDavid Howells error: 1148260a9803SDavid Howells d_drop(dentry); 1149260a9803SDavid Howells _leave(" = %d", ret); 1150260a9803SDavid Howells return ret; 1151260a9803SDavid Howells } 1152260a9803SDavid Howells 1153260a9803SDavid Howells /* 1154d2ddc776SDavid Howells * Remove a subdir from a directory. 1155260a9803SDavid Howells */ 1156d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1157260a9803SDavid Howells { 11582b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1159d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1160d2ddc776SDavid Howells 1161260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1162260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1163c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 116463a4681fSDavid Howells clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1165260a9803SDavid Howells } 1166260a9803SDavid Howells } 1167260a9803SDavid Howells 1168260a9803SDavid Howells /* 1169d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1170260a9803SDavid Howells */ 1171d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1172260a9803SDavid Howells { 1173d2ddc776SDavid Howells struct afs_fs_cursor fc; 1174d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1175260a9803SDavid Howells struct key *key; 117663a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1177260a9803SDavid Howells int ret; 1178260a9803SDavid Howells 1179a455589fSAl Viro _enter("{%x:%u},{%pd}", 1180a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1181260a9803SDavid Howells 1182260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1183260a9803SDavid Howells if (IS_ERR(key)) { 1184260a9803SDavid Howells ret = PTR_ERR(key); 1185260a9803SDavid Howells goto error; 1186260a9803SDavid Howells } 1187260a9803SDavid Howells 1188d2ddc776SDavid Howells ret = -ERESTARTSYS; 1189d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1190d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 119168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 119263a4681fSDavid Howells afs_fs_remove(&fc, dentry->d_name.name, true, 119363a4681fSDavid Howells data_version); 1194260a9803SDavid Howells } 1195260a9803SDavid Howells 1196d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1197d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 119863a4681fSDavid Howells if (ret == 0) { 1199d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 120063a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 120163a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 120263a4681fSDavid Howells afs_edit_dir_for_rmdir); 120363a4681fSDavid Howells } 1204260a9803SDavid Howells } 1205260a9803SDavid Howells 1206260a9803SDavid Howells key_put(key); 1207d2ddc776SDavid Howells error: 1208d2ddc776SDavid Howells return ret; 1209d2ddc776SDavid Howells } 1210260a9803SDavid Howells 1211d2ddc776SDavid Howells /* 1212d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1213d2ddc776SDavid Howells * 1214d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1215d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1216d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1217d2ddc776SDavid Howells * 1218d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1219d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1220d2ddc776SDavid Howells */ 1221440fbc3aSDavid Howells static int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1222440fbc3aSDavid Howells unsigned long d_version_before, 1223440fbc3aSDavid Howells unsigned long d_version_after) 1224d2ddc776SDavid Howells { 1225440fbc3aSDavid Howells bool dir_valid; 1226d2ddc776SDavid Howells int ret = 0; 1227d2ddc776SDavid Howells 1228440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1229440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1230440fbc3aSDavid Howells */ 1231440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1232440fbc3aSDavid Howells 1233d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1234d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1235d2ddc776SDavid Howells 1236440fbc3aSDavid Howells if (dir_valid) { 1237440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1238440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1239440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1240440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1241440fbc3aSDavid Howells } 1242440fbc3aSDavid Howells ret = 0; 1243440fbc3aSDavid Howells } else { 1244440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1245440fbc3aSDavid Howells 1246d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1247d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1248d2ddc776SDavid Howells 1249d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1250d2ddc776SDavid Howells if (ret == -ESTALE) 1251d2ddc776SDavid Howells ret = 0; 1252440fbc3aSDavid Howells } 1253d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1254d2ddc776SDavid Howells } 1255d2ddc776SDavid Howells 1256d2ddc776SDavid Howells return ret; 1257d2ddc776SDavid Howells } 1258d2ddc776SDavid Howells 1259d2ddc776SDavid Howells /* 1260d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1261d2ddc776SDavid Howells */ 1262d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1263d2ddc776SDavid Howells { 1264d2ddc776SDavid Howells struct afs_fs_cursor fc; 1265d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 1266d2ddc776SDavid Howells struct key *key; 1267440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 126863a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1269d2ddc776SDavid Howells int ret; 1270d2ddc776SDavid Howells 1271d2ddc776SDavid Howells _enter("{%x:%u},{%pd}", 1272d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1273d2ddc776SDavid Howells 1274d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1275d2ddc776SDavid Howells return -ENAMETOOLONG; 1276d2ddc776SDavid Howells 1277d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1278d2ddc776SDavid Howells if (IS_ERR(key)) { 1279d2ddc776SDavid Howells ret = PTR_ERR(key); 1280d2ddc776SDavid Howells goto error; 1281d2ddc776SDavid Howells } 1282d2ddc776SDavid Howells 1283d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1284d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1285d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1286d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1287d2ddc776SDavid Howells if (ret < 0) 1288d2ddc776SDavid Howells goto error_key; 1289d2ddc776SDavid Howells } 1290d2ddc776SDavid Howells 1291d2ddc776SDavid Howells ret = -ERESTARTSYS; 1292d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1293d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 129468251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 129563a4681fSDavid Howells afs_fs_remove(&fc, dentry->d_name.name, false, 129663a4681fSDavid Howells data_version); 1297d2ddc776SDavid Howells } 1298d2ddc776SDavid Howells 1299d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1300d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1301d2ddc776SDavid Howells if (ret == 0) 1302440fbc3aSDavid Howells ret = afs_dir_remove_link( 1303440fbc3aSDavid Howells dentry, key, d_version, 1304440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 130563a4681fSDavid Howells if (ret == 0 && 130663a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 130763a4681fSDavid Howells afs_edit_dir_remove(dvnode, &dentry->d_name, 130863a4681fSDavid Howells afs_edit_dir_for_unlink); 1309d2ddc776SDavid Howells } 1310d2ddc776SDavid Howells 1311d2ddc776SDavid Howells error_key: 1312260a9803SDavid Howells key_put(key); 1313260a9803SDavid Howells error: 1314260a9803SDavid Howells _leave(" = %d", ret); 1315260a9803SDavid Howells return ret; 1316260a9803SDavid Howells } 1317260a9803SDavid Howells 1318260a9803SDavid Howells /* 1319260a9803SDavid Howells * create a regular file on an AFS filesystem 1320260a9803SDavid Howells */ 13214acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1322ebfc3b49SAl Viro bool excl) 1323260a9803SDavid Howells { 1324d2ddc776SDavid Howells struct afs_fs_cursor fc; 1325d2ddc776SDavid Howells struct afs_file_status newstatus; 1326d2ddc776SDavid Howells struct afs_callback newcb; 132743dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1328d2ddc776SDavid Howells struct afs_fid newfid; 1329260a9803SDavid Howells struct key *key; 133063a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1331260a9803SDavid Howells int ret; 1332260a9803SDavid Howells 1333d2ddc776SDavid Howells mode |= S_IFREG; 1334260a9803SDavid Howells 1335a455589fSAl Viro _enter("{%x:%u},{%pd},%ho,", 1336a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1337260a9803SDavid Howells 1338d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1339d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1340d2ddc776SDavid Howells goto error; 1341d2ddc776SDavid Howells 1342260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1343260a9803SDavid Howells if (IS_ERR(key)) { 1344260a9803SDavid Howells ret = PTR_ERR(key); 1345260a9803SDavid Howells goto error; 1346260a9803SDavid Howells } 1347260a9803SDavid Howells 1348d2ddc776SDavid Howells ret = -ERESTARTSYS; 1349d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1350d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 135168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 135263a4681fSDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, data_version, 1353d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1354d2ddc776SDavid Howells } 1355d2ddc776SDavid Howells 1356d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1357d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1358d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1359d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1360260a9803SDavid Howells if (ret < 0) 1361d2ddc776SDavid Howells goto error_key; 13624433b691SDavid Howells } else { 13634433b691SDavid Howells goto error_key; 1364260a9803SDavid Howells } 1365260a9803SDavid Howells 136663a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 136763a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 136863a4681fSDavid Howells afs_edit_dir_for_create); 136963a4681fSDavid Howells 1370260a9803SDavid Howells key_put(key); 1371260a9803SDavid Howells _leave(" = 0"); 1372260a9803SDavid Howells return 0; 1373260a9803SDavid Howells 1374d2ddc776SDavid Howells error_key: 1375260a9803SDavid Howells key_put(key); 1376260a9803SDavid Howells error: 1377260a9803SDavid Howells d_drop(dentry); 1378260a9803SDavid Howells _leave(" = %d", ret); 1379260a9803SDavid Howells return ret; 1380260a9803SDavid Howells } 1381260a9803SDavid Howells 1382260a9803SDavid Howells /* 1383260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1384260a9803SDavid Howells */ 1385260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1386260a9803SDavid Howells struct dentry *dentry) 1387260a9803SDavid Howells { 1388d2ddc776SDavid Howells struct afs_fs_cursor fc; 1389260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1390260a9803SDavid Howells struct key *key; 139163a4681fSDavid Howells u64 data_version; 1392260a9803SDavid Howells int ret; 1393260a9803SDavid Howells 13942b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1395260a9803SDavid Howells dvnode = AFS_FS_I(dir); 139663a4681fSDavid Howells data_version = dvnode->status.data_version; 1397260a9803SDavid Howells 1398a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%pd}", 1399260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1400260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1401a455589fSAl Viro dentry); 1402260a9803SDavid Howells 1403d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1404d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1405d2ddc776SDavid Howells goto error; 1406d2ddc776SDavid Howells 1407260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1408260a9803SDavid Howells if (IS_ERR(key)) { 1409260a9803SDavid Howells ret = PTR_ERR(key); 1410260a9803SDavid Howells goto error; 1411260a9803SDavid Howells } 1412260a9803SDavid Howells 1413d2ddc776SDavid Howells ret = -ERESTARTSYS; 1414d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1415d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1416d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1417bc1527dcSDavid Howells goto error_key; 1418d2ddc776SDavid Howells } 1419260a9803SDavid Howells 1420d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 142168251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 142268251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); 142363a4681fSDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); 1424d2ddc776SDavid Howells } 1425d2ddc776SDavid Howells 1426d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1427d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 14287de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1429260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1430d2ddc776SDavid Howells 1431d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1432d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1433d2ddc776SDavid Howells if (ret < 0) 1434d2ddc776SDavid Howells goto error_key; 14354433b691SDavid Howells } else { 14364433b691SDavid Howells goto error_key; 1437d2ddc776SDavid Howells } 1438d2ddc776SDavid Howells 143963a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 144063a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, 144163a4681fSDavid Howells afs_edit_dir_for_link); 144263a4681fSDavid Howells 1443260a9803SDavid Howells key_put(key); 1444260a9803SDavid Howells _leave(" = 0"); 1445260a9803SDavid Howells return 0; 1446260a9803SDavid Howells 1447d2ddc776SDavid Howells error_key: 1448260a9803SDavid Howells key_put(key); 1449260a9803SDavid Howells error: 1450260a9803SDavid Howells d_drop(dentry); 1451260a9803SDavid Howells _leave(" = %d", ret); 1452260a9803SDavid Howells return ret; 1453260a9803SDavid Howells } 1454260a9803SDavid Howells 1455260a9803SDavid Howells /* 1456260a9803SDavid Howells * create a symlink in an AFS filesystem 1457260a9803SDavid Howells */ 1458260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1459260a9803SDavid Howells const char *content) 1460260a9803SDavid Howells { 1461d2ddc776SDavid Howells struct afs_fs_cursor fc; 1462d2ddc776SDavid Howells struct afs_file_status newstatus; 1463d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1464d2ddc776SDavid Howells struct afs_fid newfid; 1465260a9803SDavid Howells struct key *key; 146663a4681fSDavid Howells u64 data_version = dvnode->status.data_version; 1467260a9803SDavid Howells int ret; 1468260a9803SDavid Howells 1469a455589fSAl Viro _enter("{%x:%u},{%pd},%s", 1470a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1471260a9803SDavid Howells content); 1472260a9803SDavid Howells 1473d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1474d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1475d2ddc776SDavid Howells goto error; 1476d2ddc776SDavid Howells 1477260a9803SDavid Howells ret = -EINVAL; 147845222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1479260a9803SDavid Howells goto error; 1480260a9803SDavid Howells 1481260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1482260a9803SDavid Howells if (IS_ERR(key)) { 1483260a9803SDavid Howells ret = PTR_ERR(key); 1484260a9803SDavid Howells goto error; 1485260a9803SDavid Howells } 1486260a9803SDavid Howells 1487d2ddc776SDavid Howells ret = -ERESTARTSYS; 1488d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1489d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 149068251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(dvnode); 149163a4681fSDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, 149263a4681fSDavid Howells content, data_version, 1493d2ddc776SDavid Howells &newfid, &newstatus); 1494d2ddc776SDavid Howells } 1495d2ddc776SDavid Howells 1496d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1497d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1498d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1499d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1500260a9803SDavid Howells if (ret < 0) 1501d2ddc776SDavid Howells goto error_key; 15024433b691SDavid Howells } else { 15034433b691SDavid Howells goto error_key; 1504260a9803SDavid Howells } 1505260a9803SDavid Howells 150663a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 150763a4681fSDavid Howells afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, 150863a4681fSDavid Howells afs_edit_dir_for_symlink); 150963a4681fSDavid Howells 1510260a9803SDavid Howells key_put(key); 1511260a9803SDavid Howells _leave(" = 0"); 1512260a9803SDavid Howells return 0; 1513260a9803SDavid Howells 1514d2ddc776SDavid Howells error_key: 1515260a9803SDavid Howells key_put(key); 1516260a9803SDavid Howells error: 1517260a9803SDavid Howells d_drop(dentry); 1518260a9803SDavid Howells _leave(" = %d", ret); 1519260a9803SDavid Howells return ret; 1520260a9803SDavid Howells } 1521260a9803SDavid Howells 1522260a9803SDavid Howells /* 1523260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1524260a9803SDavid Howells */ 1525260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 15261cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 15271cd66c93SMiklos Szeredi unsigned int flags) 1528260a9803SDavid Howells { 1529d2ddc776SDavid Howells struct afs_fs_cursor fc; 1530260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1531260a9803SDavid Howells struct key *key; 153263a4681fSDavid Howells u64 orig_data_version, new_data_version; 153363a4681fSDavid Howells bool new_negative = d_is_negative(new_dentry); 1534260a9803SDavid Howells int ret; 1535260a9803SDavid Howells 15361cd66c93SMiklos Szeredi if (flags) 15371cd66c93SMiklos Szeredi return -EINVAL; 15381cd66c93SMiklos Szeredi 15392b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1540260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1541260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 154263a4681fSDavid Howells orig_data_version = orig_dvnode->status.data_version; 154363a4681fSDavid Howells new_data_version = new_dvnode->status.data_version; 1544260a9803SDavid Howells 1545a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1546260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1547260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1548260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1549a455589fSAl Viro new_dentry); 1550260a9803SDavid Howells 1551260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1552260a9803SDavid Howells if (IS_ERR(key)) { 1553260a9803SDavid Howells ret = PTR_ERR(key); 1554260a9803SDavid Howells goto error; 1555260a9803SDavid Howells } 1556260a9803SDavid Howells 1557d2ddc776SDavid Howells ret = -ERESTARTSYS; 1558d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1559d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1560d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1561d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1562bc1527dcSDavid Howells goto error_key; 1563d2ddc776SDavid Howells } 1564d2ddc776SDavid Howells } 1565d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 156668251f0aSDavid Howells fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); 156768251f0aSDavid Howells fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); 1568d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 156963a4681fSDavid Howells new_dvnode, new_dentry->d_name.name, 157063a4681fSDavid Howells orig_data_version, new_data_version); 1571d2ddc776SDavid Howells } 1572d2ddc776SDavid Howells 1573d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1574d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1575d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1576d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1577d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1578260a9803SDavid Howells if (ret < 0) 1579d2ddc776SDavid Howells goto error_key; 1580d2ddc776SDavid Howells } 1581d2ddc776SDavid Howells 158263a4681fSDavid Howells if (ret == 0) { 158363a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) 158463a4681fSDavid Howells afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 158563a4681fSDavid Howells afs_edit_dir_for_rename); 158663a4681fSDavid Howells 158763a4681fSDavid Howells if (!new_negative && 158863a4681fSDavid Howells test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 158963a4681fSDavid Howells afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 159063a4681fSDavid Howells afs_edit_dir_for_rename); 159163a4681fSDavid Howells 159263a4681fSDavid Howells if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) 159363a4681fSDavid Howells afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 159463a4681fSDavid Howells &vnode->fid, afs_edit_dir_for_rename); 159563a4681fSDavid Howells } 159663a4681fSDavid Howells 1597d2ddc776SDavid Howells error_key: 1598260a9803SDavid Howells key_put(key); 1599260a9803SDavid Howells error: 1600260a9803SDavid Howells _leave(" = %d", ret); 1601260a9803SDavid Howells return ret; 1602260a9803SDavid Howells } 1603f3ddee8dSDavid Howells 1604f3ddee8dSDavid Howells /* 1605f3ddee8dSDavid Howells * Release a directory page and clean up its private state if it's not busy 1606f3ddee8dSDavid Howells * - return true if the page can now be released, false if not 1607f3ddee8dSDavid Howells */ 1608f3ddee8dSDavid Howells static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 1609f3ddee8dSDavid Howells { 1610f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1611f3ddee8dSDavid Howells 1612f3ddee8dSDavid Howells _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 1613f3ddee8dSDavid Howells 1614f3ddee8dSDavid Howells set_page_private(page, 0); 1615f3ddee8dSDavid Howells ClearPagePrivate(page); 1616f3ddee8dSDavid Howells 1617f3ddee8dSDavid Howells /* The directory will need reloading. */ 1618f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1619f3ddee8dSDavid Howells afs_stat_v(dvnode, n_relpg); 1620f3ddee8dSDavid Howells return 1; 1621f3ddee8dSDavid Howells } 1622f3ddee8dSDavid Howells 1623f3ddee8dSDavid Howells /* 1624f3ddee8dSDavid Howells * invalidate part or all of a page 1625f3ddee8dSDavid Howells * - release a page and clean up its private data if offset is 0 (indicating 1626f3ddee8dSDavid Howells * the entire page) 1627f3ddee8dSDavid Howells */ 1628f3ddee8dSDavid Howells static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 1629f3ddee8dSDavid Howells unsigned int length) 1630f3ddee8dSDavid Howells { 1631f3ddee8dSDavid Howells struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 1632f3ddee8dSDavid Howells 1633f3ddee8dSDavid Howells _enter("{%lu},%u,%u", page->index, offset, length); 1634f3ddee8dSDavid Howells 1635f3ddee8dSDavid Howells BUG_ON(!PageLocked(page)); 1636f3ddee8dSDavid Howells 1637f3ddee8dSDavid Howells /* The directory will need reloading. */ 1638f3ddee8dSDavid Howells if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 1639f3ddee8dSDavid Howells afs_stat_v(dvnode, n_inval); 1640f3ddee8dSDavid Howells 1641f3ddee8dSDavid Howells /* we clean up only if the entire page is being invalidated */ 1642f3ddee8dSDavid Howells if (offset == 0 && length == PAGE_SIZE) { 1643f3ddee8dSDavid Howells set_page_private(page, 0); 1644f3ddee8dSDavid Howells ClearPagePrivate(page); 1645f3ddee8dSDavid Howells } 1646f3ddee8dSDavid Howells } 1647