summaryrefslogtreecommitdiffstats
path: root/fs/afs/dir.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/afs/dir.c')
-rw-r--r--fs/afs/dir.c2053
1 files changed, 2053 insertions, 0 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
new file mode 100644
index 000000000..cf811b77e
--- /dev/null
+++ b/fs/afs/dir.c
@@ -0,0 +1,2053 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* dir.c: AFS filesystem directory handling
+ *
+ * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#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 "afs_fs.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 bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
+ loff_t fpos, u64 ino, unsigned dtype);
+static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
+ loff_t fpos, u64 ino, unsigned dtype);
+static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl);
+static int afs_mkdir(struct user_namespace *mnt_userns, 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 user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, const char *content);
+static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+ struct dentry *old_dentry, struct inode *new_dir,
+ struct dentry *new_dentry, unsigned int flags);
+static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags);
+static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
+ size_t length);
+
+static bool afs_dir_dirty_folio(struct address_space *mapping,
+ struct folio *folio)
+{
+ 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,
+};
+
+const struct address_space_operations afs_dir_aops = {
+ .dirty_folio = afs_dir_dirty_folio,
+ .release_folio = afs_dir_release_folio,
+ .invalidate_folio = afs_dir_invalidate_folio,
+};
+
+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_fid fids[50];
+};
+
+/*
+ * Drop the refs that we're holding on the folios 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->vnode->netfs.inode.i_mapping;
+ struct folio *folio;
+ pgoff_t last = req->nr_pages - 1;
+
+ XA_STATE(xas, &mapping->i_pages, 0);
+
+ if (unlikely(!req->nr_pages))
+ return;
+
+ rcu_read_lock();
+ xas_for_each(&xas, folio, last) {
+ if (xas_retry(&xas, folio))
+ continue;
+ BUG_ON(xa_is_value(folio));
+ ASSERTCMP(folio_file_mapping(folio), ==, mapping);
+
+ folio_put(folio);
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * check that a directory folio is valid
+ */
+static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio,
+ loff_t i_size)
+{
+ union afs_xdr_dir_block *block;
+ size_t offset, size;
+ loff_t pos;
+
+ /* Determine how many magic numbers there should be in this folio, but
+ * we must take care because the directory may change size under us.
+ */
+ pos = folio_pos(folio);
+ if (i_size <= pos)
+ goto checked;
+
+ size = min_t(loff_t, folio_size(folio), i_size - pos);
+ for (offset = 0; offset < size; offset += sizeof(*block)) {
+ block = kmap_local_folio(folio, offset);
+ if (block->hdr.magic != AFS_DIR_MAGIC) {
+ printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n",
+ __func__, dvnode->netfs.inode.i_ino,
+ pos, offset, size, ntohs(block->hdr.magic));
+ trace_afs_dir_check_failed(dvnode, pos + offset, i_size);
+ kunmap_local(block);
+ 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 folio
+ * *should* be NUL-terminated anyway.
+ */
+ ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0;
+
+ kunmap_local(block);
+ }
+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)
+{
+ union afs_xdr_dir_block *block;
+ struct address_space *mapping = dvnode->netfs.inode.i_mapping;
+ struct folio *folio;
+ pgoff_t last = req->nr_pages - 1;
+ size_t offset, size;
+
+ 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, iov_iter_count(req->iter));
+
+ xas_for_each(&xas, folio, last) {
+ if (xas_retry(&xas, folio))
+ continue;
+
+ BUG_ON(folio_file_mapping(folio) != mapping);
+
+ size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio));
+ for (offset = 0; offset < size; offset += sizeof(*block)) {
+ block = kmap_local_folio(folio, offset);
+ pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block);
+ kunmap_local(block);
+ }
+ }
+}
+
+/*
+ * Check all the blocks in a directory. All the folios are held pinned.
+ */
+static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req)
+{
+ struct address_space *mapping = dvnode->netfs.inode.i_mapping;
+ struct folio *folio;
+ pgoff_t last = req->nr_pages - 1;
+ int ret = 0;
+
+ XA_STATE(xas, &mapping->i_pages, 0);
+
+ if (unlikely(!req->nr_pages))
+ return 0;
+
+ rcu_read_lock();
+ xas_for_each(&xas, folio, last) {
+ if (xas_retry(&xas, folio))
+ continue;
+
+ BUG_ON(folio_file_mapping(folio) != mapping);
+
+ if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) {
+ afs_dir_dump(dvnode, req);
+ ret = -EIO;
+ 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 folios 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 address_space *mapping = dvnode->netfs.inode.i_mapping;
+ struct afs_read *req;
+ loff_t i_size;
+ int nr_pages, i;
+ int ret;
+ loff_t remote_size = 0;
+
+ _enter("");
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return ERR_PTR(-ENOMEM);
+
+ refcount_set(&req->usage, 1);
+ req->vnode = dvnode;
+ req->key = key_get(key);
+ req->cleanup = afs_dir_read_cleanup;
+
+expand:
+ i_size = i_size_read(&dvnode->netfs.inode);
+ if (i_size < remote_size)
+ i_size = remote_size;
+ 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_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages,
+ 0, i_size);
+ req->iter = &req->def_iter;
+
+ /* Fill in any gaps that we might find where the memory reclaimer has
+ * been at work and pin all the folios. If there are any gaps, we will
+ * need to reread the entire directory contents.
+ */
+ i = req->nr_pages;
+ while (i < nr_pages) {
+ struct folio *folio;
+
+ folio = filemap_get_folio(mapping, i);
+ if (!folio) {
+ if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_stat_v(dvnode, n_inval);
+
+ ret = -ENOMEM;
+ folio = __filemap_get_folio(mapping,
+ i, FGP_LOCK | FGP_CREAT,
+ mapping->gfp_mask);
+ if (!folio)
+ goto error;
+ folio_attach_private(folio, (void *)1);
+ folio_unlock(folio);
+ }
+
+ req->nr_pages += folio_nr_pages(folio);
+ i += folio_nr_pages(folio);
+ }
+
+ /* 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, 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);
+ remote_size = req->file_size;
+ 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, nr_slots;
+ size_t nlen;
+ int tmp;
+
+ _enter("%llx,%x", ctx->pos, blkoff);
+
+ 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
+ ) {
+ /* 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);
+ next = offset + 1;
+ 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));
+ if (nlen > AFSNAMEMAX - 1) {
+ _debug("ENT[%zu]: name too long (len %u/%zu)",
+ blkoff / sizeof(union afs_xdr_dir_block),
+ offset, nlen);
+ return afs_bad(dvnode, afs_file_error_dir_name_too_long);
+ }
+
+ _debug("ENT[%zu.%u]: %s %zu \"%s\"",
+ blkoff / sizeof(union afs_xdr_dir_block), offset,
+ (offset < curr ? "skip" : "fill"),
+ nlen, dire->u.name);
+
+ nr_slots = afs_dir_calc_slots(nlen);
+ next = offset + nr_slots;
+ if (next > AFS_DIR_SLOTS_PER_BLOCK) {
+ _debug("ENT[%zu.%u]:"
+ " %u extends beyond end dir block"
+ " (len %zu)",
+ blkoff / sizeof(union afs_xdr_dir_block),
+ offset, next, nlen);
+ return afs_bad(dvnode, afs_file_error_dir_over_end);
+ }
+
+ /* Check that the name-extension dirents are all allocated */
+ for (tmp = 1; tmp < nr_slots; tmp++) {
+ unsigned int ix = offset + tmp;
+ if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
+ _debug("ENT[%zu.u]:"
+ " %u unmarked extension (%u/%u)",
+ blkoff / sizeof(union afs_xdr_dir_block),
+ offset, tmp, nr_slots);
+ return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
+ }
+ }
+
+ /* skip if starts before the current position */
+ if (offset < curr) {
+ if (next > curr)
+ ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
+ continue;
+ }
+
+ /* Don't expose silly rename entries to userspace. */
+ if (nlen > 6 &&
+ dire->u.name[0] == '.' &&
+ ctx->actor != afs_lookup_filldir &&
+ ctx->actor != afs_lookup_one_filldir &&
+ memcmp(dire->u.name, ".__afs", 6) == 0)
+ 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, afs_dataversion_t *_dir_version)
+{
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ union afs_xdr_dir_block *dblock;
+ struct afs_read *req;
+ struct folio *folio;
+ unsigned offset, size;
+ 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);
+ *_dir_version = req->data_version;
+
+ /* 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) {
+ /* Fetch the appropriate folio from the directory and re-add it
+ * to the LRU. We have all the pages pinned with an extra ref.
+ */
+ folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE,
+ FGP_ACCESSED, 0);
+ if (!folio) {
+ ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
+ break;
+ }
+
+ offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio);
+ size = min_t(loff_t, folio_size(folio),
+ req->actual_len - folio_file_pos(folio));
+
+ do {
+ dblock = kmap_local_folio(folio, offset);
+ ret = afs_dir_iterate_block(dvnode, ctx, dblock,
+ folio_file_pos(folio) + offset);
+ kunmap_local(dblock);
+ if (ret != 1)
+ goto out;
+
+ } while (offset += sizeof(*dblock), offset < size);
+
+ 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)
+{
+ afs_dataversion_t dir_version;
+
+ return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
+ &dir_version);
+}
+
+/*
+ * Search the directory for a single name
+ * - if afs_dir_iterate_block() spots this function, it'll pass the FID
+ * uniquifier through dtype
+ */
+static bool 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(" = true [keep looking]");
+ return true;
+ }
+
+ cookie->fid.vnode = ino;
+ cookie->fid.unique = dtype;
+ cookie->found = 1;
+
+ _leave(" = false [found]");
+ return false;
+}
+
+/*
+ * 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,
+ afs_dataversion_t *_dir_version)
+{
+ 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, _dir_version);
+ if (ret < 0) {
+ _leave(" = %d [iter]", ret);
+ return ret;
+ }
+
+ 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 bool 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);
+
+ _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[1].vnode = ino;
+ cookie->fids[1].unique = dtype;
+ cookie->found = 1;
+ if (cookie->one_only)
+ return false;
+ }
+
+ return cookie->nr_fids < 50;
+}
+
+/*
+ * Deal with the result of a successful lookup operation. Turn all the files
+ * into inodes and save the first one - which is the one we actually want.
+ */
+static void afs_do_lookup_success(struct afs_operation *op)
+{
+ struct afs_vnode_param *vp;
+ struct afs_vnode *vnode;
+ struct inode *inode;
+ u32 abort_code;
+ int i;
+
+ _enter("");
+
+ for (i = 0; i < op->nr_files; i++) {
+ switch (i) {
+ case 0:
+ vp = &op->file[0];
+ abort_code = vp->scb.status.abort_code;
+ if (abort_code != 0) {
+ op->ac.abort_code = abort_code;
+ op->error = afs_abort_to_error(abort_code);
+ }
+ break;
+
+ case 1:
+ vp = &op->file[1];
+ break;
+
+ default:
+ vp = &op->more_files[i - 2];
+ break;
+ }
+
+ if (!vp->scb.have_status && !vp->scb.have_error)
+ continue;
+
+ _debug("do [%u]", i);
+ if (vp->vnode) {
+ if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
+ afs_vnode_commit_status(op, vp);
+ } else if (vp->scb.status.abort_code == 0) {
+ inode = afs_iget(op, vp);
+ if (!IS_ERR(inode)) {
+ vnode = AFS_FS_I(inode);
+ afs_cache_permit(vnode, op->key,
+ 0 /* Assume vnode->cb_break is 0 */ +
+ op->cb_v_break,
+ &vp->scb);
+ vp->vnode = vnode;
+ vp->put_vnode = true;
+ }
+ } else {
+ _debug("- abort %d %llx:%llx.%x",
+ vp->scb.status.abort_code,
+ vp->fid.vid, vp->fid.vnode, vp->fid.unique);
+ }
+ }
+
+ _leave("");
+}
+
+static const struct afs_operation_ops afs_inline_bulk_status_operation = {
+ .issue_afs_rpc = afs_fs_inline_bulk_status,
+ .issue_yfs_rpc = yfs_fs_inline_bulk_status,
+ .success = afs_do_lookup_success,
+};
+
+static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
+ .issue_afs_rpc = afs_fs_fetch_status,
+ .issue_yfs_rpc = yfs_fs_fetch_status,
+ .success = afs_do_lookup_success,
+ .aborted = afs_check_for_remote_deletion,
+};
+
+/*
+ * See if we know that the server we expect to use doesn't support
+ * FS.InlineBulkStatus.
+ */
+static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
+{
+ struct afs_server_list *slist;
+ struct afs_volume *volume = dvnode->volume;
+ struct afs_server *server;
+ bool ret = true;
+ int i;
+
+ if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
+ return true;
+
+ rcu_read_lock();
+ slist = rcu_dereference(volume->servers);
+
+ for (i = 0; i < slist->nr_servers; i++) {
+ server = slist->servers[i].server;
+ if (server == dvnode->cb_server) {
+ if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
+ ret = false;
+ break;
+ }
+ }
+
+ rcu_read_unlock();
+ 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_vnode_param *vp;
+ struct afs_operation *op;
+ struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
+ struct inode *inode = NULL, *ti;
+ afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
+ long ret;
+ int 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);
+
+ for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
+ cookie->fids[i].vid = dvnode->fid.vid;
+ cookie->ctx.actor = afs_lookup_filldir;
+ cookie->name = dentry->d_name;
+ cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
+ * and slot 1 for the directory */
+
+ if (!afs_server_supports_ibulk(dvnode))
+ cookie->one_only = true;
+
+ /* search the directory */
+ ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
+ if (ret < 0)
+ goto out;
+
+ dentry->d_fsdata = (void *)(unsigned long)data_version;
+
+ ret = -ENOENT;
+ if (!cookie->found)
+ goto out;
+
+ /* Check to see if we already have an inode for the primary fid. */
+ inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
+ afs_ilookup5_test_by_fid, &cookie->fids[1]);
+ if (inode)
+ goto out; /* We do */
+
+ /* Okay, we didn't find it. We need to query the server - and whilst
+ * we're doing that, we're going to attempt to look up a bunch of other
+ * vnodes also.
+ */
+ op = afs_alloc_operation(NULL, dvnode->volume);
+ if (IS_ERR(op)) {
+ ret = PTR_ERR(op);
+ goto out;
+ }
+
+ afs_op_set_vnode(op, 0, dvnode);
+ afs_op_set_fid(op, 1, &cookie->fids[1]);
+
+ op->nr_files = cookie->nr_fids;
+ _debug("nr_files %u", op->nr_files);
+
+ /* Need space for examining all the selected files */
+ op->error = -ENOMEM;
+ if (op->nr_files > 2) {
+ op->more_files = kvcalloc(op->nr_files - 2,
+ sizeof(struct afs_vnode_param),
+ GFP_KERNEL);
+ if (!op->more_files)
+ goto out_op;
+
+ for (i = 2; i < op->nr_files; i++) {
+ vp = &op->more_files[i - 2];
+ vp->fid = cookie->fids[i];
+
+ /* Find any inodes that already exist and get their
+ * callback counters.
+ */
+ ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
+ afs_ilookup5_test_by_fid, &vp->fid);
+ if (!IS_ERR_OR_NULL(ti)) {
+ vnode = AFS_FS_I(ti);
+ vp->dv_before = vnode->status.data_version;
+ vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
+ vp->vnode = vnode;
+ vp->put_vnode = true;
+ vp->speculative = true; /* vnode not locked */
+ }
+ }
+ }
+
+ /* Try FS.InlineBulkStatus first. Abort codes for the individual
+ * lookups contained therein are stored in the reply without aborting
+ * the whole operation.
+ */
+ op->error = -ENOTSUPP;
+ if (!cookie->one_only) {
+ op->ops = &afs_inline_bulk_status_operation;
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+ }
+
+ if (op->error == -ENOTSUPP) {
+ /* 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 op->file[1].
+ */
+ op->fetch_status.which = 1;
+ op->ops = &afs_lookup_fetch_status_operation;
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+ }
+ inode = ERR_PTR(op->error);
+
+out_op:
+ if (op->error == 0) {
+ inode = &op->file[1].vnode->netfs.inode;
+ op->file[1].vnode = NULL;
+ }
+
+ if (op->file[0].scb.have_status)
+ dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
+ else
+ dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
+ ret = afs_put_operation(op);
+out:
+ kfree(cookie);
+ _leave("");
+ return inode ?: ERR_PTR(ret);
+}
+
+/*
+ * 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 afs_fid fid = {};
+ 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);
+
+ if (!IS_ERR_OR_NULL(inode))
+ fid = AFS_FS_I(inode)->fid;
+
+ _debug("splice %p", dentry->d_inode);
+ 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, &fid);
+ } else {
+ trace_afs_lookup(dvnode, &dentry->d_name, &fid);
+ }
+ _leave("");
+ return d;
+}
+
+/*
+ * Check the validity of a dentry under RCU conditions.
+ */
+static int afs_d_revalidate_rcu(struct dentry *dentry)
+{
+ struct afs_vnode *dvnode;
+ struct dentry *parent;
+ struct inode *dir;
+ long dir_version, de_version;
+
+ _enter("%p", dentry);
+
+ /* Check the parent directory is still valid first. */
+ parent = READ_ONCE(dentry->d_parent);
+ dir = d_inode_rcu(parent);
+ if (!dir)
+ return -ECHILD;
+ dvnode = AFS_FS_I(dir);
+ if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
+ return -ECHILD;
+
+ if (!afs_check_validity(dvnode))
+ return -ECHILD;
+
+ /* 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)READ_ONCE(dvnode->status.data_version);
+ de_version = (long)READ_ONCE(dentry->d_fsdata);
+ if (de_version != dir_version) {
+ dir_version = (long)READ_ONCE(dvnode->invalid_before);
+ if (de_version - dir_version < 0)
+ return -ECHILD;
+ }
+
+ return 1; /* Still valid */
+}
+
+/*
+ * 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 fid;
+ struct dentry *parent;
+ struct inode *inode;
+ struct key *key;
+ afs_dataversion_t dir_version, invalid_before;
+ long de_version;
+ int ret;
+
+ if (flags & LOOKUP_RCU)
+ return afs_d_revalidate_rcu(dentry);
+
+ 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;
+
+ /* Hold 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 not_found;
+ }
+
+ /* 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 = dir->status.data_version;
+ de_version = (long)dentry->d_fsdata;
+ if (de_version == (long)dir_version)
+ goto out_valid_noupdate;
+
+ invalid_before = dir->invalid_before;
+ if (de_version - (long)invalid_before >= 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->netfs.inode, dentry, &fid, key, &dir_version);
+ switch (ret) {
+ case 0:
+ /* the filename maps to something */
+ if (d_really_is_negative(dentry))
+ goto not_found;
+ inode = d_inode(dentry);
+ if (is_bad_inode(inode)) {
+ printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
+ dentry);
+ goto not_found;
+ }
+
+ 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->netfs.inode.i_generation);
+ 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 not_found;
+ }
+
+out_valid:
+ dentry->d_fsdata = (void *)(unsigned long)dir_version;
+out_valid_noupdate:
+ dput(parent);
+ key_put(key);
+ _leave(" = 1 [valid]");
+ return 1;
+
+not_found:
+ _debug("dropping dentry %pd2", dentry);
+ dput(parent);
+ 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);
+}
+
+void afs_check_for_remote_deletion(struct afs_operation *op)
+{
+ struct afs_vnode *vnode = op->file[0].vnode;
+
+ switch (op->ac.abort_code) {
+ case VNOVNODE:
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ afs_break_callback(vnode, afs_cb_break_for_deleted);
+ }
+}
+
+/*
+ * Create a new inode for create/mkdir/symlink
+ */
+static void afs_vnode_new_inode(struct afs_operation *op)
+{
+ struct afs_vnode_param *vp = &op->file[1];
+ struct afs_vnode *vnode;
+ struct inode *inode;
+
+ _enter("");
+
+ ASSERTCMP(op->error, ==, 0);
+
+ inode = afs_iget(op, vp);
+ if (IS_ERR(inode)) {
+ /* ENOMEM or EINTR at a really inconvenient time - just abandon
+ * the new directory on the server.
+ */
+ op->error = PTR_ERR(inode);
+ return;
+ }
+
+ vnode = AFS_FS_I(inode);
+ set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
+ if (!op->error)
+ afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
+ d_instantiate(op->dentry, inode);
+}
+
+static void afs_create_success(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+ op->ctime = op->file[0].scb.status.mtime_client;
+ afs_vnode_commit_status(op, &op->file[0]);
+ afs_update_dentry_version(op, &op->file[0], op->dentry);
+ afs_vnode_new_inode(op);
+}
+
+static void afs_create_edit_dir(struct afs_operation *op)
+{
+ struct afs_vnode_param *dvp = &op->file[0];
+ struct afs_vnode_param *vp = &op->file[1];
+ struct afs_vnode *dvnode = dvp->vnode;
+
+ _enter("op=%08x", op->debug_id);
+
+ down_write(&dvnode->validate_lock);
+ if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
+ dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
+ afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
+ op->create.reason);
+ up_write(&dvnode->validate_lock);
+}
+
+static void afs_create_put(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+
+ if (op->error)
+ d_drop(op->dentry);
+}
+
+static const struct afs_operation_ops afs_mkdir_operation = {
+ .issue_afs_rpc = afs_fs_make_dir,
+ .issue_yfs_rpc = yfs_fs_make_dir,
+ .success = afs_create_success,
+ .aborted = afs_check_for_remote_deletion,
+ .edit_dir = afs_create_edit_dir,
+ .put = afs_create_put,
+};
+
+/*
+ * create a directory on an AFS filesystem
+ */
+static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
+{
+ struct afs_operation *op;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+
+ _enter("{%llx:%llu},{%pd},%ho",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
+
+ op = afs_alloc_operation(NULL, dvnode->volume);
+ if (IS_ERR(op)) {
+ d_drop(dentry);
+ return PTR_ERR(op);
+ }
+
+ afs_op_set_vnode(op, 0, dvnode);
+ op->file[0].dv_delta = 1;
+ op->file[0].modification = true;
+ op->file[0].update_ctime = true;
+ op->dentry = dentry;
+ op->create.mode = S_IFDIR | mode;
+ op->create.reason = afs_edit_dir_for_mkdir;
+ op->mtime = current_time(dir);
+ op->ops = &afs_mkdir_operation;
+ return afs_do_sync_operation(op);
+}
+
+/*
+ * 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->netfs.inode);
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
+ }
+}
+
+static void afs_rmdir_success(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+ op->ctime = op->file[0].scb.status.mtime_client;
+ afs_vnode_commit_status(op, &op->file[0]);
+ afs_update_dentry_version(op, &op->file[0], op->dentry);
+}
+
+static void afs_rmdir_edit_dir(struct afs_operation *op)
+{
+ struct afs_vnode_param *dvp = &op->file[0];
+ struct afs_vnode *dvnode = dvp->vnode;
+
+ _enter("op=%08x", op->debug_id);
+ afs_dir_remove_subdir(op->dentry);
+
+ down_write(&dvnode->validate_lock);
+ if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
+ dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
+ afs_edit_dir_remove(dvnode, &op->dentry->d_name,
+ afs_edit_dir_for_rmdir);
+ up_write(&dvnode->validate_lock);
+}
+
+static void afs_rmdir_put(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+ if (op->file[1].vnode)
+ up_write(&op->file[1].vnode->rmdir_lock);
+}
+
+static const struct afs_operation_ops afs_rmdir_operation = {
+ .issue_afs_rpc = afs_fs_remove_dir,
+ .issue_yfs_rpc = yfs_fs_remove_dir,
+ .success = afs_rmdir_success,
+ .aborted = afs_check_for_remote_deletion,
+ .edit_dir = afs_rmdir_edit_dir,
+ .put = afs_rmdir_put,
+};
+
+/*
+ * remove a directory from an AFS filesystem
+ */
+static int afs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct afs_operation *op;
+ struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
+ int ret;
+
+ _enter("{%llx:%llu},{%pd}",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry);
+
+ op = afs_alloc_operation(NULL, dvnode->volume);
+ if (IS_ERR(op))
+ return PTR_ERR(op);
+
+ afs_op_set_vnode(op, 0, dvnode);
+ op->file[0].dv_delta = 1;
+ op->file[0].modification = true;
+ op->file[0].update_ctime = true;
+
+ op->dentry = dentry;
+ op->ops = &afs_rmdir_operation;
+
+ /* 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, op->key);
+ if (ret < 0)
+ goto error;
+ }
+
+ if (vnode) {
+ ret = down_write_killable(&vnode->rmdir_lock);
+ if (ret < 0)
+ goto error;
+ op->file[1].vnode = vnode;
+ }
+
+ return afs_do_sync_operation(op);
+
+error:
+ return afs_put_operation(op);
+}
+
+/*
+ * 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...
+ */
+static void afs_dir_remove_link(struct afs_operation *op)
+{
+ struct afs_vnode *dvnode = op->file[0].vnode;
+ struct afs_vnode *vnode = op->file[1].vnode;
+ struct dentry *dentry = op->dentry;
+ int ret;
+
+ if (op->error != 0 ||
+ (op->file[1].scb.have_status && op->file[1].scb.have_error))
+ return;
+ if (d_really_is_positive(dentry))
+ return;
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ /* Already done */
+ } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
+ write_seqlock(&vnode->cb_lock);
+ drop_nlink(&vnode->netfs.inode);
+ if (vnode->netfs.inode.i_nlink == 0) {
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ __afs_break_callback(vnode, afs_cb_break_for_unlink);
+ }
+ write_sequnlock(&vnode->cb_lock);
+ } else {
+ afs_break_callback(vnode, afs_cb_break_for_unlink);
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ _debug("AFS_VNODE_DELETED");
+
+ ret = afs_validate(vnode, op->key);
+ if (ret != -ESTALE)
+ op->error = ret;
+ }
+
+ _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error);
+}
+
+static void afs_unlink_success(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+ op->ctime = op->file[0].scb.status.mtime_client;
+ afs_check_dir_conflict(op, &op->file[0]);
+ afs_vnode_commit_status(op, &op->file[0]);
+ afs_vnode_commit_status(op, &op->file[1]);
+ afs_update_dentry_version(op, &op->file[0], op->dentry);
+ afs_dir_remove_link(op);
+}
+
+static void afs_unlink_edit_dir(struct afs_operation *op)
+{
+ struct afs_vnode_param *dvp = &op->file[0];
+ struct afs_vnode *dvnode = dvp->vnode;
+
+ _enter("op=%08x", op->debug_id);
+ down_write(&dvnode->validate_lock);
+ if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
+ dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
+ afs_edit_dir_remove(dvnode, &op->dentry->d_name,
+ afs_edit_dir_for_unlink);
+ up_write(&dvnode->validate_lock);
+}
+
+static void afs_unlink_put(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+ if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
+ d_rehash(op->dentry);
+}
+
+static const struct afs_operation_ops afs_unlink_operation = {
+ .issue_afs_rpc = afs_fs_remove_file,
+ .issue_yfs_rpc = yfs_fs_remove_file,
+ .success = afs_unlink_success,
+ .aborted = afs_check_for_remote_deletion,
+ .edit_dir = afs_unlink_edit_dir,
+ .put = afs_unlink_put,
+};
+
+/*
+ * Remove a file or symlink from an AFS filesystem.
+ */
+static int afs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct afs_operation *op;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+ int ret;
+
+ _enter("{%llx:%llu},{%pd}",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry);
+
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ return -ENAMETOOLONG;
+
+ op = afs_alloc_operation(NULL, dvnode->volume);
+ if (IS_ERR(op))
+ return PTR_ERR(op);
+
+ afs_op_set_vnode(op, 0, dvnode);
+ op->file[0].dv_delta = 1;
+ op->file[0].modification = true;
+ op->file[0].update_ctime = true;
+
+ /* Try to make sure we have a callback promise on the victim. */
+ ret = afs_validate(vnode, op->key);
+ if (ret < 0) {
+ op->error = ret;
+ goto error;
+ }
+
+ spin_lock(&dentry->d_lock);
+ if (d_count(dentry) > 1) {
+ spin_unlock(&dentry->d_lock);
+ /* Start asynchronous writeout of the inode */
+ write_inode_now(d_inode(dentry), 0);
+ op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
+ goto error;
+ }
+ if (!d_unhashed(dentry)) {
+ /* Prevent a race with RCU lookup. */
+ __d_drop(dentry);
+ op->unlink.need_rehash = true;
+ }
+ spin_unlock(&dentry->d_lock);
+
+ op->file[1].vnode = vnode;
+ op->file[1].update_ctime = true;
+ op->file[1].op_unlinked = true;
+ op->dentry = dentry;
+ op->ops = &afs_unlink_operation;
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+
+ /* If there was a conflict with a third party, check the status of the
+ * unlinked vnode.
+ */
+ if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+ op->file[1].update_ctime = false;
+ op->fetch_status.which = 1;
+ op->ops = &afs_fetch_status_operation;
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+ }
+
+ return afs_put_operation(op);
+
+error:
+ return afs_put_operation(op);
+}
+
+static const struct afs_operation_ops afs_create_operation = {
+ .issue_afs_rpc = afs_fs_create_file,
+ .issue_yfs_rpc = yfs_fs_create_file,
+ .success = afs_create_success,
+ .aborted = afs_check_for_remote_deletion,
+ .edit_dir = afs_create_edit_dir,
+ .put = afs_create_put,
+};
+
+/*
+ * create a regular file on an AFS filesystem
+ */
+static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
+{
+ struct afs_operation *op;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ int ret = -ENAMETOOLONG;
+
+ _enter("{%llx:%llu},{%pd},%ho",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
+
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ goto error;
+
+ op = afs_alloc_operation(NULL, dvnode->volume);
+ if (IS_ERR(op)) {
+ ret = PTR_ERR(op);
+ goto error;
+ }
+
+ afs_op_set_vnode(op, 0, dvnode);
+ op->file[0].dv_delta = 1;
+ op->file[0].modification = true;
+ op->file[0].update_ctime = true;
+
+ op->dentry = dentry;
+ op->create.mode = S_IFREG | mode;
+ op->create.reason = afs_edit_dir_for_create;
+ op->mtime = current_time(dir);
+ op->ops = &afs_create_operation;
+ return afs_do_sync_operation(op);
+
+error:
+ d_drop(dentry);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+static void afs_link_success(struct afs_operation *op)
+{
+ struct afs_vnode_param *dvp = &op->file[0];
+ struct afs_vnode_param *vp = &op->file[1];
+
+ _enter("op=%08x", op->debug_id);
+ op->ctime = dvp->scb.status.mtime_client;
+ afs_vnode_commit_status(op, dvp);
+ afs_vnode_commit_status(op, vp);
+ afs_update_dentry_version(op, dvp, op->dentry);
+ if (op->dentry_2->d_parent == op->dentry->d_parent)
+ afs_update_dentry_version(op, dvp, op->dentry_2);
+ ihold(&vp->vnode->netfs.inode);
+ d_instantiate(op->dentry, &vp->vnode->netfs.inode);
+}
+
+static void afs_link_put(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+ if (op->error)
+ d_drop(op->dentry);
+}
+
+static const struct afs_operation_ops afs_link_operation = {
+ .issue_afs_rpc = afs_fs_link,
+ .issue_yfs_rpc = yfs_fs_link,
+ .success = afs_link_success,
+ .aborted = afs_check_for_remote_deletion,
+ .edit_dir = afs_create_edit_dir,
+ .put = afs_link_put,
+};
+
+/*
+ * 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_operation *op;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
+ int ret = -ENAMETOOLONG;
+
+ _enter("{%llx:%llu},{%llx:%llu},{%pd}",
+ vnode->fid.vid, vnode->fid.vnode,
+ dvnode->fid.vid, dvnode->fid.vnode,
+ dentry);
+
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ goto error;
+
+ op = afs_alloc_operation(NULL, dvnode->volume);
+ if (IS_ERR(op)) {
+ ret = PTR_ERR(op);
+ goto error;
+ }
+
+ ret = afs_validate(vnode, op->key);
+ if (ret < 0)
+ goto error_op;
+
+ afs_op_set_vnode(op, 0, dvnode);
+ afs_op_set_vnode(op, 1, vnode);
+ op->file[0].dv_delta = 1;
+ op->file[0].modification = true;
+ op->file[0].update_ctime = true;
+ op->file[1].update_ctime = true;
+
+ op->dentry = dentry;
+ op->dentry_2 = from;
+ op->ops = &afs_link_operation;
+ op->create.reason = afs_edit_dir_for_link;
+ return afs_do_sync_operation(op);
+
+error_op:
+ afs_put_operation(op);
+error:
+ d_drop(dentry);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+static const struct afs_operation_ops afs_symlink_operation = {
+ .issue_afs_rpc = afs_fs_symlink,
+ .issue_yfs_rpc = yfs_fs_symlink,
+ .success = afs_create_success,
+ .aborted = afs_check_for_remote_deletion,
+ .edit_dir = afs_create_edit_dir,
+ .put = afs_create_put,
+};
+
+/*
+ * create a symlink in an AFS filesystem
+ */
+static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, const char *content)
+{
+ struct afs_operation *op;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ 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;
+
+ op = afs_alloc_operation(NULL, dvnode->volume);
+ if (IS_ERR(op)) {
+ ret = PTR_ERR(op);
+ goto error;
+ }
+
+ afs_op_set_vnode(op, 0, dvnode);
+ op->file[0].dv_delta = 1;
+
+ op->dentry = dentry;
+ op->ops = &afs_symlink_operation;
+ op->create.reason = afs_edit_dir_for_symlink;
+ op->create.symlink = content;
+ op->mtime = current_time(dir);
+ return afs_do_sync_operation(op);
+
+error:
+ d_drop(dentry);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+static void afs_rename_success(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+
+ op->ctime = op->file[0].scb.status.mtime_client;
+ afs_check_dir_conflict(op, &op->file[1]);
+ afs_vnode_commit_status(op, &op->file[0]);
+ if (op->file[1].vnode != op->file[0].vnode) {
+ op->ctime = op->file[1].scb.status.mtime_client;
+ afs_vnode_commit_status(op, &op->file[1]);
+ }
+}
+
+static void afs_rename_edit_dir(struct afs_operation *op)
+{
+ struct afs_vnode_param *orig_dvp = &op->file[0];
+ struct afs_vnode_param *new_dvp = &op->file[1];
+ struct afs_vnode *orig_dvnode = orig_dvp->vnode;
+ struct afs_vnode *new_dvnode = new_dvp->vnode;
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
+ struct dentry *old_dentry = op->dentry;
+ struct dentry *new_dentry = op->dentry_2;
+ struct inode *new_inode;
+
+ _enter("op=%08x", op->debug_id);
+
+ if (op->rename.rehash) {
+ d_rehash(op->rename.rehash);
+ op->rename.rehash = NULL;
+ }
+
+ down_write(&orig_dvnode->validate_lock);
+ if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
+ orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
+ afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
+ afs_edit_dir_for_rename_0);
+
+ if (new_dvnode != orig_dvnode) {
+ up_write(&orig_dvnode->validate_lock);
+ down_write(&new_dvnode->validate_lock);
+ }
+
+ if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
+ new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
+ if (!op->rename.new_negative)
+ afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
+ afs_edit_dir_for_rename_1);
+
+ 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 (S_ISDIR(new_inode->i_mode))
+ clear_nlink(new_inode);
+ else if (new_inode->i_nlink > 0)
+ drop_nlink(new_inode);
+ spin_unlock(&new_inode->i_lock);
+ }
+
+ /* Now we can update d_fsdata on the dentries to reflect their
+ * new parent's data_version.
+ *
+ * Note that if we ever implement RENAME_EXCHANGE, we'll have
+ * to update both dentries with opposing dir versions.
+ */
+ afs_update_dentry_version(op, new_dvp, op->dentry);
+ afs_update_dentry_version(op, new_dvp, op->dentry_2);
+
+ d_move(old_dentry, new_dentry);
+
+ up_write(&new_dvnode->validate_lock);
+}
+
+static void afs_rename_put(struct afs_operation *op)
+{
+ _enter("op=%08x", op->debug_id);
+ if (op->rename.rehash)
+ d_rehash(op->rename.rehash);
+ dput(op->rename.tmp);
+ if (op->error)
+ d_rehash(op->dentry);
+}
+
+static const struct afs_operation_ops afs_rename_operation = {
+ .issue_afs_rpc = afs_fs_rename,
+ .issue_yfs_rpc = yfs_fs_rename,
+ .success = afs_rename_success,
+ .edit_dir = afs_rename_edit_dir,
+ .put = afs_rename_put,
+};
+
+/*
+ * rename a file in an AFS filesystem and/or move it between directories
+ */
+static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+ struct dentry *old_dentry, struct inode *new_dir,
+ struct dentry *new_dentry, unsigned int flags)
+{
+ struct afs_operation *op;
+ struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
+ 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);
+
+ _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);
+
+ op = afs_alloc_operation(NULL, orig_dvnode->volume);
+ if (IS_ERR(op))
+ return PTR_ERR(op);
+
+ ret = afs_validate(vnode, op->key);
+ op->error = ret;
+ if (ret < 0)
+ goto error;
+
+ afs_op_set_vnode(op, 0, orig_dvnode);
+ afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
+ op->file[0].dv_delta = 1;
+ op->file[1].dv_delta = 1;
+ op->file[0].modification = true;
+ op->file[1].modification = true;
+ op->file[0].update_ctime = true;
+ op->file[1].update_ctime = true;
+
+ op->dentry = old_dentry;
+ op->dentry_2 = new_dentry;
+ op->rename.new_negative = d_is_negative(new_dentry);
+ op->ops = &afs_rename_operation;
+
+ /* 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);
+ op->rename.rehash = new_dentry;
+ }
+
+ if (d_count(new_dentry) > 2) {
+ /* copy the target dentry's name */
+ op->rename.tmp = d_alloc(new_dentry->d_parent,
+ &new_dentry->d_name);
+ if (!op->rename.tmp) {
+ op->error = -ENOMEM;
+ goto error;
+ }
+
+ ret = afs_sillyrename(new_dvnode,
+ AFS_FS_I(d_inode(new_dentry)),
+ new_dentry, op->key);
+ if (ret) {
+ op->error = ret;
+ goto error;
+ }
+
+ op->dentry_2 = op->rename.tmp;
+ op->rename.rehash = NULL;
+ op->rename.new_negative = true;
+ }
+ }
+
+ /* This bit is potentially nasty as there's a potential race with
+ * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
+ * to reflect it's new parent's new data_version after the op, but
+ * d_revalidate may see old_dentry between the op having taken place
+ * and the version being updated.
+ *
+ * So drop the old_dentry for now to make other threads go through
+ * lookup instead - which we hold a lock against.
+ */
+ d_drop(old_dentry);
+
+ return afs_do_sync_operation(op);
+
+error:
+ return afs_put_operation(op);
+}
+
+/*
+ * Release a directory folio and clean up its private state if it's not busy
+ * - return true if the folio can now be released, false if not
+ */
+static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags)
+{
+ struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
+
+ _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio));
+
+ folio_detach_private(folio);
+
+ /* The directory will need reloading. */
+ if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_stat_v(dvnode, n_relpg);
+ return true;
+}
+
+/*
+ * Invalidate part or all of a folio.
+ */
+static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
+ size_t length)
+{
+ struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
+
+ _enter("{%lu},%zu,%zu", folio->index, offset, length);
+
+ BUG_ON(!folio_test_locked(folio));
+
+ /* 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 folio is being invalidated */
+ if (offset == 0 && length == folio_size(folio))
+ folio_detach_private(folio);
+}