| /* dir.c: AFS filesystem directory handling |
| * |
| * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/fs.h> |
| #include <linux/namei.h> |
| #include <linux/pagemap.h> |
| #include <linux/swap.h> |
| #include <linux/ctype.h> |
| #include <linux/sched.h> |
| #include <linux/task_io_accounting_ops.h> |
| #include "internal.h" |
| #include "xdr_fs.h" |
| |
| static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags); |
| static int afs_dir_open(struct inode *inode, struct file *file); |
| static int afs_readdir(struct file *file, struct dir_context *ctx); |
| static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); |
| static int afs_d_delete(const struct dentry *dentry); |
| static void afs_d_iput(struct dentry *dentry, struct inode *inode); |
| static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, |
| loff_t fpos, u64 ino, unsigned dtype); |
| static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, |
| loff_t fpos, u64 ino, unsigned dtype); |
| static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| bool excl); |
| static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
| static int afs_rmdir(struct inode *dir, struct dentry *dentry); |
| static int afs_unlink(struct inode *dir, struct dentry *dentry); |
| static int afs_link(struct dentry *from, struct inode *dir, |
| struct dentry *dentry); |
| static int afs_symlink(struct inode *dir, struct dentry *dentry, |
| const char *content); |
| static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry, |
| unsigned int flags); |
| static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); |
| static void afs_dir_invalidatepage(struct page *page, unsigned int offset, |
| unsigned int length); |
| |
| static int afs_dir_set_page_dirty(struct page *page) |
| { |
| BUG(); /* This should never happen. */ |
| } |
| |
| const struct file_operations afs_dir_file_operations = { |
| .open = afs_dir_open, |
| .release = afs_release, |
| .iterate_shared = afs_readdir, |
| .lock = afs_lock, |
| .llseek = generic_file_llseek, |
| }; |
| |
| const struct inode_operations afs_dir_inode_operations = { |
| .create = afs_create, |
| .lookup = afs_lookup, |
| .link = afs_link, |
| .unlink = afs_unlink, |
| .symlink = afs_symlink, |
| .mkdir = afs_mkdir, |
| .rmdir = afs_rmdir, |
| .rename = afs_rename, |
| .permission = afs_permission, |
| .getattr = afs_getattr, |
| .setattr = afs_setattr, |
| .listxattr = afs_listxattr, |
| }; |
| |
| const struct address_space_operations afs_dir_aops = { |
| .set_page_dirty = afs_dir_set_page_dirty, |
| .releasepage = afs_dir_releasepage, |
| .invalidatepage = afs_dir_invalidatepage, |
| }; |
| |
| const struct dentry_operations afs_fs_dentry_operations = { |
| .d_revalidate = afs_d_revalidate, |
| .d_delete = afs_d_delete, |
| .d_release = afs_d_release, |
| .d_automount = afs_d_automount, |
| .d_iput = afs_d_iput, |
| }; |
| |
| struct afs_lookup_one_cookie { |
| struct dir_context ctx; |
| struct qstr name; |
| bool found; |
| struct afs_fid fid; |
| }; |
| |
| struct afs_lookup_cookie { |
| struct dir_context ctx; |
| struct qstr name; |
| bool found; |
| bool one_only; |
| unsigned short nr_fids; |
| struct afs_file_status *statuses; |
| struct afs_callback *callbacks; |
| struct afs_fid fids[50]; |
| }; |
| |
| /* |
| * Drop the refs that we're holding on the pages we were reading into. We've |
| * got refs on the first nr_pages pages. |
| */ |
| static void afs_dir_read_cleanup(struct afs_read *req) |
| { |
| struct address_space *mapping = req->iter.mapping; |
| struct page *page; |
| pgoff_t last = req->nr_pages; |
| |
| XA_STATE(xas, &mapping->i_pages, 0); |
| |
| if (unlikely(!req->nr_pages)) |
| return; |
| |
| rcu_read_lock(); |
| xas_for_each(&xas, page, last) { |
| if (xas_retry(&xas, page)) |
| continue; |
| BUG_ON(xa_is_value(page)); |
| BUG_ON(PageCompound(page)); |
| BUG_ON(page->mapping != req->iter.mapping); |
| |
| put_page(page); |
| } |
| |
| rcu_read_unlock(); |
| } |
| |
| /* |
| * check that a directory page is valid |
| */ |
| static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, |
| loff_t i_size) |
| { |
| struct afs_xdr_dir_page *dbuf; |
| loff_t latter, off; |
| int tmp, qty; |
| |
| /* Determine how many magic numbers there should be in this page, but |
| * we must take care because the directory may change size under us. |
| */ |
| off = page_offset(page); |
| if (i_size <= off) |
| goto checked; |
| |
| latter = i_size - off; |
| if (latter >= PAGE_SIZE) |
| qty = PAGE_SIZE; |
| else |
| qty = latter; |
| qty /= sizeof(union afs_xdr_dir_block); |
| |
| /* check them */ |
| dbuf = kmap_atomic(page); |
| for (tmp = 0; tmp < qty; tmp++) { |
| if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { |
| printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", |
| __func__, dvnode->vfs_inode.i_ino, tmp, qty, |
| ntohs(dbuf->blocks[tmp].hdr.magic)); |
| trace_afs_dir_check_failed(dvnode, off, i_size); |
| kunmap(page); |
| trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); |
| goto error; |
| } |
| |
| /* Make sure each block is NUL terminated so we can reasonably |
| * use string functions on it. The filenames in the page |
| * *should* be NUL-terminated anyway. |
| */ |
| ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; |
| } |
| |
| kunmap_atomic(dbuf); |
| |
| checked: |
| afs_stat_v(dvnode, n_read_dir); |
| return true; |
| |
| error: |
| return false; |
| } |
| |
| /* |
| * Dump the contents of a directory. |
| */ |
| static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req) |
| { |
| struct afs_xdr_dir_page *dbuf; |
| struct address_space *mapping = dvnode->vfs_inode.i_mapping; |
| struct page *page; |
| unsigned int i, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); |
| |
| XA_STATE(xas, &mapping->i_pages, 0); |
| |
| pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n", |
| dvnode->fid.vid, dvnode->fid.vnode, |
| req->file_size, req->len, req->actual_len); |
| pr_warn("DIR %llx %x %zx %zx\n", |
| req->pos, req->nr_pages, |
| req->iter.iov_offset, req->iter.count); |
| |
| xas_for_each(&xas, page, req->nr_pages) { |
| if (xas_retry(&xas, page)) |
| continue; |
| |
| BUG_ON(PageCompound(page)); |
| BUG_ON(page->mapping != mapping); |
| |
| dbuf = kmap_atomic(page); |
| for (i = 0; i < qty; i++) { |
| union afs_xdr_dir_block *block = &dbuf->blocks[i]; |
| |
| pr_warn("[%02lx] %32phN\n", page->index * qty + i, block); |
| } |
| kunmap_atomic(dbuf); |
| } |
| } |
| |
| /* |
| * Check all the pages in a directory. All the pages are held pinned. |
| */ |
| static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req) |
| { |
| struct address_space *mapping = dvnode->vfs_inode.i_mapping; |
| struct page *page; |
| pgoff_t last = req->nr_pages; |
| int ret = 0; |
| |
| XA_STATE(xas, &mapping->i_pages, 0); |
| |
| if (unlikely(!req->nr_pages)) |
| return 0; |
| |
| rcu_read_lock(); |
| xas_for_each(&xas, page, last) { |
| if (xas_retry(&xas, page)) |
| continue; |
| |
| BUG_ON(PageCompound(page)); |
| BUG_ON(page->mapping != mapping); |
| |
| ret = afs_dir_check_page(dvnode, page, req->file_size); |
| if (ret < 0) { |
| afs_dir_dump(dvnode, req); |
| break; |
| } |
| } |
| |
| rcu_read_unlock(); |
| return ret; |
| } |
| |
| /* |
| * open an AFS directory file |
| */ |
| static int afs_dir_open(struct inode *inode, struct file *file) |
| { |
| _enter("{%lu}", inode->i_ino); |
| |
| BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
| BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); |
| |
| if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) |
| return -ENOENT; |
| |
| return afs_open(inode, file); |
| } |
| |
| /* |
| * Read the directory into the pagecache in one go, scrubbing the previous |
| * contents. The list of pages is returned, pinning them so that they don't |
| * get reclaimed during the iteration. |
| */ |
| static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) |
| __acquires(&dvnode->validate_lock) |
| { |
| struct afs_read *req; |
| loff_t i_size; |
| int nr_pages, i, n; |
| int ret; |
| |
| _enter(""); |
| |
| req = kzalloc(sizeof(*req), GFP_KERNEL); |
| if (!req) |
| return ERR_PTR(-ENOMEM); |
| |
| refcount_set(&req->usage, 1); |
| req->cleanup = afs_dir_read_cleanup; |
| |
| expand: |
| i_size = i_size_read(&dvnode->vfs_inode); |
| if (i_size < 2048) { |
| ret = afs_bad(dvnode, afs_file_error_dir_small); |
| goto error; |
| } |
| if (i_size > 2048 * 1024) { |
| trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); |
| ret = -EFBIG; |
| goto error; |
| } |
| |
| _enter("%llu", i_size); |
| |
| nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; |
| |
| req->actual_len = i_size; /* May change */ |
| req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ |
| req->data_version = dvnode->status.data_version; /* May change */ |
| iov_iter_mapping(&req->iter, READ, dvnode->vfs_inode.i_mapping, |
| 0, i_size); |
| |
| /* Fill in any gaps that we might find where the memory reclaimer has |
| * been at work and pin all the pages. If there are any gaps, we will |
| * need to reread the entire directory contents. |
| */ |
| i = req->nr_pages; |
| while (i < nr_pages) { |
| struct page *pages[8], *page; |
| |
| n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, |
| min_t(unsigned int, nr_pages - i, |
| ARRAY_SIZE(pages)), |
| pages); |
| _debug("find %u at %u/%u", n, i, nr_pages); |
| |
| if (n == 0) { |
| gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; |
| |
| if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_stat_v(dvnode, n_inval); |
| |
| ret = -ENOMEM; |
| page = __page_cache_alloc(gfp); |
| if (!page) |
| goto error; |
| ret = add_to_page_cache_lru(page, |
| dvnode->vfs_inode.i_mapping, |
| i, gfp); |
| if (ret < 0) |
| goto error; |
| |
| set_page_private(page, 1); |
| SetPagePrivate(page); |
| unlock_page(page); |
| req->nr_pages++; |
| i++; |
| } else { |
| req->nr_pages += n; |
| i += n; |
| } |
| } |
| |
| /* If we're going to reload, we need to lock all the pages to prevent |
| * races. |
| */ |
| ret = -ERESTARTSYS; |
| if (down_read_killable(&dvnode->validate_lock) < 0) |
| goto error; |
| |
| if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| goto success; |
| |
| up_read(&dvnode->validate_lock); |
| if (down_write_killable(&dvnode->validate_lock) < 0) |
| goto error; |
| |
| if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { |
| trace_afs_reload_dir(dvnode); |
| ret = afs_fetch_data(dvnode, key, req); |
| if (ret < 0) |
| goto error_unlock; |
| |
| task_io_account_read(PAGE_SIZE * req->nr_pages); |
| |
| if (req->len < req->file_size) { |
| /* The content has grown, so we need to expand the |
| * buffer. |
| */ |
| up_write(&dvnode->validate_lock); |
| goto expand; |
| } |
| |
| /* Validate the data we just read. */ |
| ret = afs_dir_check(dvnode, req); |
| if (ret < 0) |
| goto error_unlock; |
| |
| // TODO: Trim excess pages |
| |
| set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); |
| } |
| |
| downgrade_write(&dvnode->validate_lock); |
| success: |
| return req; |
| |
| error_unlock: |
| up_write(&dvnode->validate_lock); |
| error: |
| afs_put_read(req); |
| _leave(" = %d", ret); |
| return ERR_PTR(ret); |
| } |
| |
| /* |
| * deal with one block in an AFS directory |
| */ |
| static int afs_dir_iterate_block(struct afs_vnode *dvnode, |
| struct dir_context *ctx, |
| union afs_xdr_dir_block *block, |
| unsigned blkoff) |
| { |
| union afs_xdr_dirent *dire; |
| unsigned offset, next, curr; |
| size_t nlen; |
| int tmp; |
| |
| _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); |
| |
| curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); |
| |
| /* walk through the block, an entry at a time */ |
| for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); |
| offset < AFS_DIR_SLOTS_PER_BLOCK; |
| offset = next |
| ) { |
| next = offset + 1; |
| |
| /* skip entries marked unused in the bitmap */ |
| if (!(block->hdr.bitmap[offset / 8] & |
| (1 << (offset % 8)))) { |
| _debug("ENT[%zu.%u]: unused", |
| blkoff / sizeof(union afs_xdr_dir_block), offset); |
| if (offset >= curr) |
| ctx->pos = blkoff + |
| next * sizeof(union afs_xdr_dirent); |
| continue; |
| } |
| |
| /* got a valid entry */ |
| dire = &block->dirents[offset]; |
| nlen = strnlen(dire->u.name, |
| sizeof(*block) - |
| offset * sizeof(union afs_xdr_dirent)); |
| |
| _debug("ENT[%zu.%u]: %s %zu \"%s\"", |
| blkoff / sizeof(union afs_xdr_dir_block), offset, |
| (offset < curr ? "skip" : "fill"), |
| nlen, dire->u.name); |
| |
| /* work out where the next possible entry is */ |
| for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) { |
| if (next >= AFS_DIR_SLOTS_PER_BLOCK) { |
| _debug("ENT[%zu.%u]:" |
| " %u travelled beyond end dir block" |
| " (len %u/%zu)", |
| blkoff / sizeof(union afs_xdr_dir_block), |
| offset, next, tmp, nlen); |
| return afs_bad(dvnode, afs_file_error_dir_over_end); |
| } |
| if (!(block->hdr.bitmap[next / 8] & |
| (1 << (next % 8)))) { |
| _debug("ENT[%zu.%u]:" |
| " %u unmarked extension (len %u/%zu)", |
| blkoff / sizeof(union afs_xdr_dir_block), |
| offset, next, tmp, nlen); |
| return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); |
| } |
| |
| _debug("ENT[%zu.%u]: ext %u/%zu", |
| blkoff / sizeof(union afs_xdr_dir_block), |
| next, tmp, nlen); |
| next++; |
| } |
| |
| /* skip if starts before the current position */ |
| if (offset < curr) |
| continue; |
| |
| /* found the next entry */ |
| if (!dir_emit(ctx, dire->u.name, nlen, |
| ntohl(dire->u.vnode), |
| (ctx->actor == afs_lookup_filldir || |
| ctx->actor == afs_lookup_one_filldir)? |
| ntohl(dire->u.unique) : DT_UNKNOWN)) { |
| _leave(" = 0 [full]"); |
| return 0; |
| } |
| |
| ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); |
| } |
| |
| _leave(" = 1 [more]"); |
| return 1; |
| } |
| |
| /* |
| * iterate through the data blob that lists the contents of an AFS directory |
| */ |
| static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, |
| struct key *key) |
| { |
| struct afs_vnode *dvnode = AFS_FS_I(dir); |
| struct afs_xdr_dir_page *dbuf; |
| union afs_xdr_dir_block *dblock; |
| struct afs_read *req; |
| struct page *page; |
| unsigned blkoff, limit; |
| void __rcu **slot; |
| int ret; |
| |
| _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); |
| |
| if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { |
| _leave(" = -ESTALE"); |
| return -ESTALE; |
| } |
| |
| req = afs_read_dir(dvnode, key); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| /* round the file position up to the next entry boundary */ |
| ctx->pos += sizeof(union afs_xdr_dirent) - 1; |
| ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); |
| |
| /* walk through the blocks in sequence */ |
| ret = 0; |
| while (ctx->pos < req->actual_len) { |
| blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); |
| |
| /* Fetch the appropriate page from the directory and re-add it |
| * to the LRU. We have all the pages pinned with an extra ref. |
| */ |
| rcu_read_lock(); |
| page = NULL; |
| slot = radix_tree_lookup_slot(&dvnode->vfs_inode.i_mapping->i_pages, |
| blkoff / PAGE_SIZE); |
| if (slot) |
| page = radix_tree_deref_slot(slot); |
| rcu_read_unlock(); |
| if (!page) { |
| ret = afs_bad(dvnode, afs_file_error_dir_missing_page); |
| break; |
| } |
| mark_page_accessed(page); |
| |
| limit = blkoff & ~(PAGE_SIZE - 1); |
| |
| dbuf = kmap(page); |
| |
| /* deal with the individual blocks stashed on this page */ |
| do { |
| dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / |
| sizeof(union afs_xdr_dir_block)]; |
| ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); |
| if (ret != 1) { |
| kunmap(page); |
| goto out; |
| } |
| |
| blkoff += sizeof(union afs_xdr_dir_block); |
| |
| } while (ctx->pos < dir->i_size && blkoff < limit); |
| |
| kunmap(page); |
| ret = 0; |
| } |
| |
| out: |
| up_read(&dvnode->validate_lock); |
| afs_put_read(req); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * read an AFS directory |
| */ |
| static int afs_readdir(struct file *file, struct dir_context *ctx) |
| { |
| return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); |
| } |
| |
| /* |
| * Search the directory for a single name |
| * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
| * uniquifier through dtype |
| */ |
| static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, |
| int nlen, loff_t fpos, u64 ino, unsigned dtype) |
| { |
| struct afs_lookup_one_cookie *cookie = |
| container_of(ctx, struct afs_lookup_one_cookie, ctx); |
| |
| _enter("{%s,%u},%s,%u,,%llu,%u", |
| cookie->name.name, cookie->name.len, name, nlen, |
| (unsigned long long) ino, dtype); |
| |
| /* insanity checks first */ |
| BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
| BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); |
| |
| if (cookie->name.len != nlen || |
| memcmp(cookie->name.name, name, nlen) != 0) { |
| _leave(" = 0 [no]"); |
| return 0; |
| } |
| |
| cookie->fid.vnode = ino; |
| cookie->fid.unique = dtype; |
| cookie->found = 1; |
| |
| _leave(" = -1 [found]"); |
| return -1; |
| } |
| |
| /* |
| * Do a lookup of a single name in a directory |
| * - just returns the FID the dentry name maps to if found |
| */ |
| static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, |
| struct afs_fid *fid, struct key *key) |
| { |
| struct afs_super_info *as = dir->i_sb->s_fs_info; |
| struct afs_lookup_one_cookie cookie = { |
| .ctx.actor = afs_lookup_one_filldir, |
| .name = dentry->d_name, |
| .fid.vid = as->volume->vid |
| }; |
| int ret; |
| |
| _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
| |
| /* search the directory */ |
| ret = afs_dir_iterate(dir, &cookie.ctx, key); |
| if (ret < 0) { |
| _leave(" = %d [iter]", ret); |
| return ret; |
| } |
| |
| ret = -ENOENT; |
| if (!cookie.found) { |
| _leave(" = -ENOENT [not found]"); |
| return -ENOENT; |
| } |
| |
| *fid = cookie.fid; |
| _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); |
| return 0; |
| } |
| |
| /* |
| * search the directory for a name |
| * - if afs_dir_iterate_block() spots this function, it'll pass the FID |
| * uniquifier through dtype |
| */ |
| static int afs_lookup_filldir(struct dir_context *ctx, const char *name, |
| int nlen, loff_t fpos, u64 ino, unsigned dtype) |
| { |
| struct afs_lookup_cookie *cookie = |
| container_of(ctx, struct afs_lookup_cookie, ctx); |
| int ret; |
| |
| _enter("{%s,%u},%s,%u,,%llu,%u", |
| cookie->name.name, cookie->name.len, name, nlen, |
| (unsigned long long) ino, dtype); |
| |
| /* insanity checks first */ |
| BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); |
| BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); |
| |
| if (cookie->found) { |
| if (cookie->nr_fids < 50) { |
| cookie->fids[cookie->nr_fids].vnode = ino; |
| cookie->fids[cookie->nr_fids].unique = dtype; |
| cookie->nr_fids++; |
| } |
| } else if (cookie->name.len == nlen && |
| memcmp(cookie->name.name, name, nlen) == 0) { |
| cookie->fids[0].vnode = ino; |
| cookie->fids[0].unique = dtype; |
| cookie->found = 1; |
| if (cookie->one_only) |
| return -1; |
| } |
| |
| ret = cookie->nr_fids >= 50 ? -1 : 0; |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * Do a lookup in a directory. We make use of bulk lookup to query a slew of |
| * files in one go and create inodes for them. The inode of the file we were |
| * asked for is returned. |
| */ |
| static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, |
| struct key *key) |
| { |
| struct afs_lookup_cookie *cookie; |
| struct afs_cb_interest *cbi = NULL; |
| struct afs_super_info *as = dir->i_sb->s_fs_info; |
| struct afs_iget_data data; |
| struct afs_fs_cursor fc; |
| struct afs_vnode *dvnode = AFS_FS_I(dir); |
| struct inode *inode = NULL; |
| int ret, i; |
| |
| _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); |
| |
| cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); |
| if (!cookie) |
| return ERR_PTR(-ENOMEM); |
| |
| cookie->ctx.actor = afs_lookup_filldir; |
| cookie->name = dentry->d_name; |
| cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ |
| |
| read_seqlock_excl(&dvnode->cb_lock); |
| if (dvnode->cb_interest && |
| dvnode->cb_interest->server && |
| test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) |
| cookie->one_only = true; |
| read_sequnlock_excl(&dvnode->cb_lock); |
| |
| for (i = 0; i < 50; i++) |
| cookie->fids[i].vid = as->volume->vid; |
| |
| /* search the directory */ |
| ret = afs_dir_iterate(dir, &cookie->ctx, key); |
| if (ret < 0) { |
| inode = ERR_PTR(ret); |
| goto out; |
| } |
| |
| inode = ERR_PTR(-ENOENT); |
| if (!cookie->found) |
| goto out; |
| |
| /* Check to see if we already have an inode for the primary fid. */ |
| data.volume = dvnode->volume; |
| data.fid = cookie->fids[0]; |
| inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); |
| if (inode) |
| goto out; |
| |
| /* Need space for examining all the selected files */ |
| inode = ERR_PTR(-ENOMEM); |
| cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), |
| GFP_KERNEL); |
| if (!cookie->statuses) |
| goto out; |
| |
| cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), |
| GFP_KERNEL); |
| if (!cookie->callbacks) |
| goto out_s; |
| |
| /* Try FS.InlineBulkStatus first. Abort codes for the individual |
| * lookups contained therein are stored in the reply without aborting |
| * the whole operation. |
| */ |
| if (cookie->one_only) |
| goto no_inline_bulk_status; |
| |
| inode = ERR_PTR(-ERESTARTSYS); |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| while (afs_select_fileserver(&fc)) { |
| if (test_bit(AFS_SERVER_FL_NO_IBULK, |
| &fc.cbi->server->flags)) { |
| fc.ac.abort_code = RX_INVALID_OPERATION; |
| fc.ac.error = -ECONNABORTED; |
| break; |
| } |
| afs_fs_inline_bulk_status(&fc, |
| afs_v2net(dvnode), |
| cookie->fids, |
| cookie->statuses, |
| cookie->callbacks, |
| cookie->nr_fids, NULL); |
| } |
| |
| if (fc.ac.error == 0) |
| cbi = afs_get_cb_interest(fc.cbi); |
| if (fc.ac.abort_code == RX_INVALID_OPERATION) |
| set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); |
| inode = ERR_PTR(afs_end_vnode_operation(&fc)); |
| } |
| |
| if (!IS_ERR(inode)) |
| goto success; |
| if (fc.ac.abort_code != RX_INVALID_OPERATION) |
| goto out_c; |
| |
| no_inline_bulk_status: |
| /* We could try FS.BulkStatus next, but this aborts the entire op if |
| * any of the lookups fails - so, for the moment, revert to |
| * FS.FetchStatus for just the primary fid. |
| */ |
| cookie->nr_fids = 1; |
| inode = ERR_PTR(-ERESTARTSYS); |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| while (afs_select_fileserver(&fc)) { |
| afs_fs_fetch_status(&fc, |
| afs_v2net(dvnode), |
| cookie->fids, |
| cookie->statuses, |
| cookie->callbacks, |
| NULL); |
| } |
| |
| if (fc.ac.error == 0) |
| cbi = afs_get_cb_interest(fc.cbi); |
| inode = ERR_PTR(afs_end_vnode_operation(&fc)); |
| } |
| |
| if (IS_ERR(inode)) |
| goto out_c; |
| |
| for (i = 0; i < cookie->nr_fids; i++) |
| cookie->statuses[i].abort_code = 0; |
| |
| success: |
| /* Turn all the files into inodes and save the first one - which is the |
| * one we actually want. |
| */ |
| if (cookie->statuses[0].abort_code != 0) |
| inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); |
| |
| for (i = 0; i < cookie->nr_fids; i++) { |
| struct inode *ti; |
| |
| if (cookie->statuses[i].abort_code != 0) |
| continue; |
| |
| ti = afs_iget(dir->i_sb, key, &cookie->fids[i], |
| &cookie->statuses[i], |
| &cookie->callbacks[i], |
| cbi, dvnode); |
| if (i == 0) { |
| inode = ti; |
| } else { |
| if (!IS_ERR(ti)) |
| iput(ti); |
| } |
| } |
| |
| out_c: |
| afs_put_cb_interest(afs_v2net(dvnode), cbi); |
| kfree(cookie->callbacks); |
| out_s: |
| kfree(cookie->statuses); |
| out: |
| kfree(cookie); |
| return inode; |
| } |
| |
| /* |
| * Look up an entry in a directory with @sys substitution. |
| */ |
| static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, |
| struct key *key) |
| { |
| struct afs_sysnames *subs; |
| struct afs_net *net = afs_i2net(dir); |
| struct dentry *ret; |
| char *buf, *p, *name; |
| int len, i; |
| |
| _enter(""); |
| |
| ret = ERR_PTR(-ENOMEM); |
| p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); |
| if (!buf) |
| goto out_p; |
| if (dentry->d_name.len > 4) { |
| memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); |
| p += dentry->d_name.len - 4; |
| } |
| |
| /* There is an ordered list of substitutes that we have to try. */ |
| read_lock(&net->sysnames_lock); |
| subs = net->sysnames; |
| refcount_inc(&subs->usage); |
| read_unlock(&net->sysnames_lock); |
| |
| for (i = 0; i < subs->nr; i++) { |
| name = subs->subs[i]; |
| len = dentry->d_name.len - 4 + strlen(name); |
| if (len >= AFSNAMEMAX) { |
| ret = ERR_PTR(-ENAMETOOLONG); |
| goto out_s; |
| } |
| |
| strcpy(p, name); |
| ret = lookup_one_len(buf, dentry->d_parent, len); |
| if (IS_ERR(ret) || d_is_positive(ret)) |
| goto out_s; |
| dput(ret); |
| } |
| |
| /* We don't want to d_add() the @sys dentry here as we don't want to |
| * the cached dentry to hide changes to the sysnames list. |
| */ |
| ret = NULL; |
| out_s: |
| afs_put_sysnames(subs); |
| kfree(buf); |
| out_p: |
| key_put(key); |
| return ret; |
| } |
| |
| /* |
| * look up an entry in a directory |
| */ |
| static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags) |
| { |
| struct afs_vnode *dvnode = AFS_FS_I(dir); |
| struct inode *inode; |
| struct dentry *d; |
| struct key *key; |
| int ret; |
| |
| _enter("{%llx:%llu},%p{%pd},", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); |
| |
| ASSERTCMP(d_inode(dentry), ==, NULL); |
| |
| if (dentry->d_name.len >= AFSNAMEMAX) { |
| _leave(" = -ENAMETOOLONG"); |
| return ERR_PTR(-ENAMETOOLONG); |
| } |
| |
| if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { |
| _leave(" = -ESTALE"); |
| return ERR_PTR(-ESTALE); |
| } |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| _leave(" = %ld [key]", PTR_ERR(key)); |
| return ERR_CAST(key); |
| } |
| |
| ret = afs_validate(dvnode, key); |
| if (ret < 0) { |
| key_put(key); |
| _leave(" = %d [val]", ret); |
| return ERR_PTR(ret); |
| } |
| |
| if (dentry->d_name.len >= 4 && |
| dentry->d_name.name[dentry->d_name.len - 4] == '@' && |
| dentry->d_name.name[dentry->d_name.len - 3] == 's' && |
| dentry->d_name.name[dentry->d_name.len - 2] == 'y' && |
| dentry->d_name.name[dentry->d_name.len - 1] == 's') |
| return afs_lookup_atsys(dir, dentry, key); |
| |
| afs_stat_v(dvnode, n_lookup); |
| inode = afs_do_lookup(dir, dentry, key); |
| key_put(key); |
| if (inode == ERR_PTR(-ENOENT)) { |
| inode = afs_try_auto_mntpt(dentry, dir); |
| } else { |
| dentry->d_fsdata = |
| (void *)(unsigned long)dvnode->status.data_version; |
| } |
| d = d_splice_alias(inode, dentry); |
| if (!IS_ERR_OR_NULL(d)) { |
| d->d_fsdata = dentry->d_fsdata; |
| trace_afs_lookup(dvnode, &d->d_name, |
| inode ? AFS_FS_I(inode) : NULL); |
| } else { |
| trace_afs_lookup(dvnode, &dentry->d_name, |
| inode ? AFS_FS_I(inode) : NULL); |
| } |
| return d; |
| } |
| |
| /* |
| * check that a dentry lookup hit has found a valid entry |
| * - NOTE! the hit can be a negative hit too, so we can't assume we have an |
| * inode |
| */ |
| static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) |
| { |
| struct afs_vnode *vnode, *dir; |
| struct afs_fid uninitialized_var(fid); |
| struct dentry *parent; |
| struct inode *inode; |
| struct key *key; |
| long dir_version, de_version; |
| int ret; |
| |
| if (flags & LOOKUP_RCU) |
| return -ECHILD; |
| |
| if (d_really_is_positive(dentry)) { |
| vnode = AFS_FS_I(d_inode(dentry)); |
| _enter("{v={%llx:%llu} n=%pd fl=%lx},", |
| vnode->fid.vid, vnode->fid.vnode, dentry, |
| vnode->flags); |
| } else { |
| _enter("{neg n=%pd}", dentry); |
| } |
| |
| key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); |
| if (IS_ERR(key)) |
| key = NULL; |
| |
| if (d_really_is_positive(dentry)) { |
| inode = d_inode(dentry); |
| if (inode) { |
| vnode = AFS_FS_I(inode); |
| afs_validate(vnode, key); |
| if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
| goto out_bad; |
| } |
| } |
| |
| /* lock down the parent dentry so we can peer at it */ |
| parent = dget_parent(dentry); |
| dir = AFS_FS_I(d_inode(parent)); |
| |
| /* validate the parent directory */ |
| afs_validate(dir, key); |
| |
| if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { |
| _debug("%pd: parent dir deleted", dentry); |
| goto out_bad_parent; |
| } |
| |
| /* We only need to invalidate a dentry if the server's copy changed |
| * behind our back. If we made the change, it's no problem. Note that |
| * on a 32-bit system, we only have 32 bits in the dentry to store the |
| * version. |
| */ |
| dir_version = (long)dir->status.data_version; |
| de_version = (long)dentry->d_fsdata; |
| if (de_version == dir_version) |
| goto out_valid; |
| |
| dir_version = (long)dir->invalid_before; |
| if (de_version - dir_version >= 0) |
| goto out_valid; |
| |
| _debug("dir modified"); |
| afs_stat_v(dir, n_reval); |
| |
| /* search the directory for this vnode */ |
| ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); |
| switch (ret) { |
| case 0: |
| /* the filename maps to something */ |
| if (d_really_is_negative(dentry)) |
| goto out_bad_parent; |
| inode = d_inode(dentry); |
| if (is_bad_inode(inode)) { |
| printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", |
| dentry); |
| goto out_bad_parent; |
| } |
| |
| vnode = AFS_FS_I(inode); |
| |
| /* if the vnode ID has changed, then the dirent points to a |
| * different file */ |
| if (fid.vnode != vnode->fid.vnode) { |
| _debug("%pd: dirent changed [%llu != %llu]", |
| dentry, fid.vnode, |
| vnode->fid.vnode); |
| goto not_found; |
| } |
| |
| /* if the vnode ID uniqifier has changed, then the file has |
| * been deleted and replaced, and the original vnode ID has |
| * been reused */ |
| if (fid.unique != vnode->fid.unique) { |
| _debug("%pd: file deleted (uq %u -> %u I:%u)", |
| dentry, fid.unique, |
| vnode->fid.unique, |
| vnode->vfs_inode.i_generation); |
| write_seqlock(&vnode->cb_lock); |
| set_bit(AFS_VNODE_DELETED, &vnode->flags); |
| write_sequnlock(&vnode->cb_lock); |
| goto not_found; |
| } |
| goto out_valid; |
| |
| case -ENOENT: |
| /* the filename is unknown */ |
| _debug("%pd: dirent not found", dentry); |
| if (d_really_is_positive(dentry)) |
| goto not_found; |
| goto out_valid; |
| |
| default: |
| _debug("failed to iterate dir %pd: %d", |
| parent, ret); |
| goto out_bad_parent; |
| } |
| |
| out_valid: |
| dentry->d_fsdata = (void *)dir_version; |
| dput(parent); |
| key_put(key); |
| _leave(" = 1 [valid]"); |
| return 1; |
| |
| /* the dirent, if it exists, now points to a different vnode */ |
| not_found: |
| spin_lock(&dentry->d_lock); |
| dentry->d_flags |= DCACHE_NFSFS_RENAMED; |
| spin_unlock(&dentry->d_lock); |
| |
| out_bad_parent: |
| _debug("dropping dentry %pd2", dentry); |
| dput(parent); |
| out_bad: |
| key_put(key); |
| |
| _leave(" = 0 [bad]"); |
| return 0; |
| } |
| |
| /* |
| * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't |
| * sleep) |
| * - called from dput() when d_count is going to 0. |
| * - return 1 to request dentry be unhashed, 0 otherwise |
| */ |
| static int afs_d_delete(const struct dentry *dentry) |
| { |
| _enter("%pd", dentry); |
| |
| if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| goto zap; |
| |
| if (d_really_is_positive(dentry) && |
| (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || |
| test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) |
| goto zap; |
| |
| _leave(" = 0 [keep]"); |
| return 0; |
| |
| zap: |
| _leave(" = 1 [zap]"); |
| return 1; |
| } |
| |
| /* |
| * Clean up sillyrename files on dentry removal. |
| */ |
| static void afs_d_iput(struct dentry *dentry, struct inode *inode) |
| { |
| if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| afs_silly_iput(dentry, inode); |
| iput(inode); |
| } |
| |
| /* |
| * handle dentry release |
| */ |
| void afs_d_release(struct dentry *dentry) |
| { |
| _enter("%pd", dentry); |
| } |
| |
| /* |
| * Create a new inode for create/mkdir/symlink |
| */ |
| static void afs_vnode_new_inode(struct afs_fs_cursor *fc, |
| struct dentry *new_dentry, |
| struct afs_fid *newfid, |
| struct afs_file_status *newstatus, |
| struct afs_callback *newcb) |
| { |
| struct afs_vnode *vnode; |
| struct inode *inode; |
| |
| if (fc->ac.error < 0) |
| return; |
| |
| inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, |
| newfid, newstatus, newcb, fc->cbi, fc->vnode); |
| if (IS_ERR(inode)) { |
| /* ENOMEM or EINTR at a really inconvenient time - just abandon |
| * the new directory on the server. |
| */ |
| fc->ac.error = PTR_ERR(inode); |
| return; |
| } |
| |
| vnode = AFS_FS_I(inode); |
| set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); |
| afs_vnode_commit_status(fc, vnode, 0); |
| d_instantiate(new_dentry, inode); |
| } |
| |
| /* |
| * create a directory on an AFS filesystem |
| */ |
| static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| { |
| struct afs_file_status newstatus; |
| struct afs_fs_cursor fc; |
| struct afs_callback newcb; |
| struct afs_vnode *dvnode = AFS_FS_I(dir); |
| struct afs_fid newfid; |
| struct key *key; |
| u64 data_version = dvnode->status.data_version; |
| int ret; |
| |
| mode |= S_IFDIR; |
| |
| _enter("{%llx:%llu},{%pd},%ho", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = -ERESTARTSYS; |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| while (afs_select_fileserver(&fc)) { |
| fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
| afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
| &newfid, &newstatus, &newcb); |
| } |
| |
| afs_check_for_remote_deletion(&fc, fc.vnode); |
| afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
| afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); |
| ret = afs_end_vnode_operation(&fc); |
| if (ret < 0) |
| goto error_key; |
| } else { |
| goto error_key; |
| } |
| |
| if (ret == 0 && |
| test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, |
| afs_edit_dir_for_create); |
| |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| error_key: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * Remove a subdir from a directory. |
| */ |
| static void afs_dir_remove_subdir(struct dentry *dentry) |
| { |
| if (d_really_is_positive(dentry)) { |
| struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
| |
| clear_nlink(&vnode->vfs_inode); |
| set_bit(AFS_VNODE_DELETED, &vnode->flags); |
| clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); |
| clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); |
| } |
| } |
| |
| /* |
| * remove a directory from an AFS filesystem |
| */ |
| static int afs_rmdir(struct inode *dir, struct dentry *dentry) |
| { |
| struct afs_fs_cursor fc; |
| struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
| struct key *key; |
| u64 data_version = dvnode->status.data_version; |
| int ret; |
| |
| _enter("{%llx:%llu},{%pd}", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry); |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| /* Try to make sure we have a callback promise on the victim. */ |
| if (d_really_is_positive(dentry)) { |
| vnode = AFS_FS_I(d_inode(dentry)); |
| ret = afs_validate(vnode, key); |
| if (ret < 0) |
| goto error_key; |
| } |
| |
| if (vnode) { |
| ret = down_write_killable(&vnode->rmdir_lock); |
| if (ret < 0) |
| goto error_key; |
| } |
| |
| ret = -ERESTARTSYS; |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| while (afs_select_fileserver(&fc)) { |
| fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
| afs_fs_remove(&fc, vnode, dentry->d_name.name, true, |
| data_version); |
| } |
| |
| afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
| ret = afs_end_vnode_operation(&fc); |
| if (ret == 0) { |
| afs_dir_remove_subdir(dentry); |
| if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_edit_dir_remove(dvnode, &dentry->d_name, |
| afs_edit_dir_for_rmdir); |
| } |
| } |
| |
| if (vnode) |
| up_write(&vnode->rmdir_lock); |
| error_key: |
| key_put(key); |
| error: |
| return ret; |
| } |
| |
| /* |
| * Remove a link to a file or symlink from a directory. |
| * |
| * If the file was not deleted due to excess hard links, the fileserver will |
| * break the callback promise on the file - if it had one - before it returns |
| * to us, and if it was deleted, it won't |
| * |
| * However, if we didn't have a callback promise outstanding, or it was |
| * outstanding on a different server, then it won't break it either... |
| */ |
| int afs_dir_remove_link(struct dentry *dentry, struct key *key, |
| unsigned long d_version_before, |
| unsigned long d_version_after) |
| { |
| bool dir_valid; |
| int ret = 0; |
| |
| /* There were no intervening changes on the server if the version |
| * number we got back was incremented by exactly 1. |
| */ |
| dir_valid = (d_version_after == d_version_before + 1); |
| |
| if (d_really_is_positive(dentry)) { |
| struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
| |
| if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
| /* Already done */ |
| } else if (dir_valid) { |
| drop_nlink(&vnode->vfs_inode); |
| if (vnode->vfs_inode.i_nlink == 0) { |
| set_bit(AFS_VNODE_DELETED, &vnode->flags); |
| clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); |
| } |
| ret = 0; |
| } else { |
| clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); |
| |
| if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) |
| kdebug("AFS_VNODE_DELETED"); |
| |
| ret = afs_validate(vnode, key); |
| if (ret == -ESTALE) |
| ret = 0; |
| } |
| _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Remove a file or symlink from an AFS filesystem. |
| */ |
| static int afs_unlink(struct inode *dir, struct dentry *dentry) |
| { |
| struct afs_fs_cursor fc; |
| struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; |
| struct key *key; |
| unsigned long d_version = (unsigned long)dentry->d_fsdata; |
| bool need_rehash = false; |
| u64 data_version = dvnode->status.data_version; |
| int ret; |
| |
| _enter("{%llx:%llu},{%pd}", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry); |
| |
| if (dentry->d_name.len >= AFSNAMEMAX) |
| return -ENAMETOOLONG; |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| /* Try to make sure we have a callback promise on the victim. */ |
| if (d_really_is_positive(dentry)) { |
| vnode = AFS_FS_I(d_inode(dentry)); |
| ret = afs_validate(vnode, key); |
| if (ret < 0) |
| goto error_key; |
| } |
| |
| spin_lock(&dentry->d_lock); |
| if (vnode && d_count(dentry) > 1) { |
| spin_unlock(&dentry->d_lock); |
| /* Start asynchronous writeout of the inode */ |
| write_inode_now(d_inode(dentry), 0); |
| ret = afs_sillyrename(dvnode, vnode, dentry, key); |
| goto error_key; |
| } |
| if (!d_unhashed(dentry)) { |
| /* Prevent a race with RCU lookup. */ |
| __d_drop(dentry); |
| need_rehash = true; |
| } |
| spin_unlock(&dentry->d_lock); |
| |
| ret = -ERESTARTSYS; |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| while (afs_select_fileserver(&fc)) { |
| fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
| |
| if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) && |
| !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) { |
| yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name, |
| data_version); |
| if (fc.ac.error != -ECONNABORTED || |
| fc.ac.abort_code != RXGEN_OPCODE) |
| continue; |
| set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags); |
| } |
| |
| afs_fs_remove(&fc, vnode, dentry->d_name.name, false, |
| data_version); |
| } |
| |
| afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
| ret = afs_end_vnode_operation(&fc); |
| if (ret == 0) |
| ret = afs_dir_remove_link( |
| dentry, key, d_version, |
| (unsigned long)dvnode->status.data_version); |
| if (ret == 0 && |
| test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_edit_dir_remove(dvnode, &dentry->d_name, |
| afs_edit_dir_for_unlink); |
| } |
| |
| if (need_rehash && ret < 0 && ret != -ENOENT) |
| d_rehash(dentry); |
| |
| error_key: |
| key_put(key); |
| error: |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * create a regular file on an AFS filesystem |
| */ |
| static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| bool excl) |
| { |
| struct afs_fs_cursor fc; |
| struct afs_file_status newstatus; |
| struct afs_callback newcb; |
| struct afs_vnode *dvnode = AFS_FS_I(dir); |
| struct afs_fid newfid; |
| struct key *key; |
| u64 data_version = dvnode->status.data_version; |
| int ret; |
| |
| mode |= S_IFREG; |
| |
| _enter("{%llx:%llu},{%pd},%ho,", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); |
| |
| ret = -ENAMETOOLONG; |
| if (dentry->d_name.len >= AFSNAMEMAX) |
| goto error; |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = -ERESTARTSYS; |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| while (afs_select_fileserver(&fc)) { |
| fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
| afs_fs_create(&fc, dentry->d_name.name, mode, data_version, |
| &newfid, &newstatus, &newcb); |
| } |
| |
| afs_check_for_remote_deletion(&fc, fc.vnode); |
| afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
| afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); |
| ret = afs_end_vnode_operation(&fc); |
| if (ret < 0) |
| goto error_key; |
| } else { |
| goto error_key; |
| } |
| |
| if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, |
| afs_edit_dir_for_create); |
| |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| error_key: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * create a hard link between files in an AFS filesystem |
| */ |
| static int afs_link(struct dentry *from, struct inode *dir, |
| struct dentry *dentry) |
| { |
| struct afs_fs_cursor fc; |
| struct afs_vnode *dvnode, *vnode; |
| struct key *key; |
| u64 data_version; |
| int ret; |
| |
| vnode = AFS_FS_I(d_inode(from)); |
| dvnode = AFS_FS_I(dir); |
| data_version = dvnode->status.data_version; |
| |
| _enter("{%llx:%llu},{%llx:%llu},{%pd}", |
| vnode->fid.vid, vnode->fid.vnode, |
| dvnode->fid.vid, dvnode->fid.vnode, |
| dentry); |
| |
| ret = -ENAMETOOLONG; |
| if (dentry->d_name.len >= AFSNAMEMAX) |
| goto error; |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = -ERESTARTSYS; |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { |
| afs_end_vnode_operation(&fc); |
| goto error_key; |
| } |
| |
| while (afs_select_fileserver(&fc)) { |
| fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
| fc.cb_break_2 = afs_calc_vnode_cb_break(vnode); |
| afs_fs_link(&fc, vnode, dentry->d_name.name, data_version); |
| } |
| |
| afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
| afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); |
| ihold(&vnode->vfs_inode); |
| d_instantiate(dentry, &vnode->vfs_inode); |
| |
| mutex_unlock(&vnode->io_lock); |
| ret = afs_end_vnode_operation(&fc); |
| if (ret < 0) |
| goto error_key; |
| } else { |
| goto error_key; |
| } |
| |
| if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid, |
| afs_edit_dir_for_link); |
| |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| error_key: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * create a symlink in an AFS filesystem |
| */ |
| static int afs_symlink(struct inode *dir, struct dentry *dentry, |
| const char *content) |
| { |
| struct afs_fs_cursor fc; |
| struct afs_file_status newstatus; |
| struct afs_vnode *dvnode = AFS_FS_I(dir); |
| struct afs_fid newfid; |
| struct key *key; |
| u64 data_version = dvnode->status.data_version; |
| int ret; |
| |
| _enter("{%llx:%llu},{%pd},%s", |
| dvnode->fid.vid, dvnode->fid.vnode, dentry, |
| content); |
| |
| ret = -ENAMETOOLONG; |
| if (dentry->d_name.len >= AFSNAMEMAX) |
| goto error; |
| |
| ret = -EINVAL; |
| if (strlen(content) >= AFSPATHMAX) |
| goto error; |
| |
| key = afs_request_key(dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| ret = -ERESTARTSYS; |
| if (afs_begin_vnode_operation(&fc, dvnode, key)) { |
| while (afs_select_fileserver(&fc)) { |
| fc.cb_break = afs_calc_vnode_cb_break(dvnode); |
| afs_fs_symlink(&fc, dentry->d_name.name, |
| content, data_version, |
| &newfid, &newstatus); |
| } |
| |
| afs_check_for_remote_deletion(&fc, fc.vnode); |
| afs_vnode_commit_status(&fc, dvnode, fc.cb_break); |
| afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); |
| ret = afs_end_vnode_operation(&fc); |
| if (ret < 0) |
| goto error_key; |
| } else { |
| goto error_key; |
| } |
| |
| if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_edit_dir_add(dvnode, &dentry->d_name, &newfid, |
| afs_edit_dir_for_symlink); |
| |
| key_put(key); |
| _leave(" = 0"); |
| return 0; |
| |
| error_key: |
| key_put(key); |
| error: |
| d_drop(dentry); |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * rename a file in an AFS filesystem and/or move it between directories |
| */ |
| static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry, |
| unsigned int flags) |
| { |
| struct afs_fs_cursor fc; |
| struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; |
| struct dentry *tmp = NULL, *rehash = NULL; |
| struct inode *new_inode; |
| struct key *key; |
| u64 orig_data_version, new_data_version; |
| bool new_negative = d_is_negative(new_dentry); |
| int ret; |
| |
| if (flags) |
| return -EINVAL; |
| |
| /* Don't allow silly-rename files be moved around. */ |
| if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| return -EINVAL; |
| |
| vnode = AFS_FS_I(d_inode(old_dentry)); |
| orig_dvnode = AFS_FS_I(old_dir); |
| new_dvnode = AFS_FS_I(new_dir); |
| orig_data_version = orig_dvnode->status.data_version; |
| new_data_version = new_dvnode->status.data_version; |
| |
| _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", |
| orig_dvnode->fid.vid, orig_dvnode->fid.vnode, |
| vnode->fid.vid, vnode->fid.vnode, |
| new_dvnode->fid.vid, new_dvnode->fid.vnode, |
| new_dentry); |
| |
| key = afs_request_key(orig_dvnode->volume->cell); |
| if (IS_ERR(key)) { |
| ret = PTR_ERR(key); |
| goto error; |
| } |
| |
| /* For non-directories, check whether the target is busy and if so, |
| * make a copy of the dentry and then do a silly-rename. If the |
| * silly-rename succeeds, the copied dentry is hashed and becomes the |
| * new target. |
| */ |
| if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { |
| /* To prevent any new references to the target during the |
| * rename, we unhash the dentry in advance. |
| */ |
| if (!d_unhashed(new_dentry)) { |
| d_drop(new_dentry); |
| rehash = new_dentry; |
| } |
| |
| if (d_count(new_dentry) > 2) { |
| /* copy the target dentry's name */ |
| ret = -ENOMEM; |
| tmp = d_alloc(new_dentry->d_parent, |
| &new_dentry->d_name); |
| if (!tmp) |
| goto error_rehash; |
| |
| ret = afs_sillyrename(new_dvnode, |
| AFS_FS_I(d_inode(new_dentry)), |
| new_dentry, key); |
| if (ret) |
| goto error_rehash; |
| |
| new_dentry = tmp; |
| rehash = NULL; |
| new_negative = true; |
| orig_data_version = orig_dvnode->status.data_version; |
| new_data_version = new_dvnode->status.data_version; |
| } |
| } |
| |
| ret = -ERESTARTSYS; |
| if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { |
| if (orig_dvnode != new_dvnode) { |
| if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { |
| afs_end_vnode_operation(&fc); |
| goto error_rehash; |
| } |
| } |
| while (afs_select_fileserver(&fc)) { |
| fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode); |
| fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); |
| afs_fs_rename(&fc, old_dentry->d_name.name, |
| new_dvnode, new_dentry->d_name.name, |
| orig_data_version, new_data_version); |
| } |
| |
| afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); |
| afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); |
| if (orig_dvnode != new_dvnode) |
| mutex_unlock(&new_dvnode->io_lock); |
| ret = afs_end_vnode_operation(&fc); |
| if (ret < 0) |
| goto error_rehash; |
| } |
| |
| if (ret == 0) { |
| if (rehash) |
| d_rehash(rehash); |
| if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags)) |
| afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, |
| afs_edit_dir_for_rename_0); |
| |
| if (!new_negative && |
| test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) |
| afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, |
| afs_edit_dir_for_rename_1); |
| |
| if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags)) |
| afs_edit_dir_add(new_dvnode, &new_dentry->d_name, |
| &vnode->fid, afs_edit_dir_for_rename_2); |
| |
| new_inode = d_inode(new_dentry); |
| if (new_inode) { |
| spin_lock(&new_inode->i_lock); |
| if (new_inode->i_nlink > 0) |
| drop_nlink(new_inode); |
| spin_unlock(&new_inode->i_lock); |
| } |
| d_move(old_dentry, new_dentry); |
| goto error_tmp; |
| } |
| |
| error_rehash: |
| if (rehash) |
| d_rehash(rehash); |
| error_tmp: |
| if (tmp) |
| dput(tmp); |
| key_put(key); |
| error: |
| _leave(" = %d", ret); |
| return ret; |
| } |
| |
| /* |
| * Release a directory page and clean up its private state if it's not busy |
| * - return true if the page can now be released, false if not |
| */ |
| static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) |
| { |
| struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); |
| |
| _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); |
| |
| set_page_private(page, 0); |
| ClearPagePrivate(page); |
| |
| /* The directory will need reloading. */ |
| if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_stat_v(dvnode, n_relpg); |
| return 1; |
| } |
| |
| /* |
| * invalidate part or all of a page |
| * - release a page and clean up its private data if offset is 0 (indicating |
| * the entire page) |
| */ |
| static void afs_dir_invalidatepage(struct page *page, unsigned int offset, |
| unsigned int length) |
| { |
| struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); |
| |
| _enter("{%lu},%u,%u", page->index, offset, length); |
| |
| BUG_ON(!PageLocked(page)); |
| |
| /* The directory will need reloading. */ |
| if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) |
| afs_stat_v(dvnode, n_inval); |
| |
| /* we clean up only if the entire page is being invalidated */ |
| if (offset == 0 && length == PAGE_SIZE) { |
| set_page_private(page, 0); |
| ClearPagePrivate(page); |
| } |
| } |