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-rw-r--r--fs/afs/inode.c972
1 files changed, 972 insertions, 0 deletions
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
new file mode 100644
index 000000000..5921dd368
--- /dev/null
+++ b/fs/afs/inode.c
@@ -0,0 +1,972 @@
+/*
+ * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
+ *
+ * This software may be freely redistributed under the terms of the
+ * GNU General Public License.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Authors: David Woodhouse <dwmw2@infradead.org>
+ * David Howells <dhowells@redhat.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/sched.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/iversion.h>
+#include "internal.h"
+#include "afs_fs.h"
+
+static const struct inode_operations afs_symlink_inode_operations = {
+ .get_link = page_get_link,
+};
+
+static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
+{
+ static unsigned long once_only;
+
+ pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type);
+ pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
+ vnode->status.abort_code,
+ vnode->status.mode,
+ vnode->status.size,
+ vnode->status.data_version);
+ pr_warn("kAFS: vnode %llx:%llx:%x\n",
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique);
+ if (parent_vnode)
+ pr_warn("kAFS: dir %llx:%llx:%x\n",
+ parent_vnode->fid.vid,
+ parent_vnode->fid.vnode,
+ parent_vnode->fid.unique);
+
+ if (!test_and_set_bit(0, &once_only))
+ dump_stack();
+}
+
+/*
+ * Set parameters for the netfs library
+ */
+static void afs_set_netfs_context(struct afs_vnode *vnode)
+{
+ netfs_inode_init(&vnode->netfs, &afs_req_ops);
+}
+
+/*
+ * Initialise an inode from the vnode status.
+ */
+static int afs_inode_init_from_status(struct afs_operation *op,
+ struct afs_vnode_param *vp,
+ struct afs_vnode *vnode)
+{
+ struct afs_file_status *status = &vp->scb.status;
+ struct inode *inode = AFS_VNODE_TO_I(vnode);
+ struct timespec64 t;
+
+ _enter("{%llx:%llu.%u} %s",
+ vp->fid.vid, vp->fid.vnode, vp->fid.unique,
+ op->type ? op->type->name : "???");
+
+ _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
+ status->type,
+ status->nlink,
+ (unsigned long long) status->size,
+ status->data_version,
+ status->mode);
+
+ write_seqlock(&vnode->cb_lock);
+
+ vnode->cb_v_break = op->cb_v_break;
+ vnode->cb_s_break = op->cb_s_break;
+ vnode->status = *status;
+
+ t = status->mtime_client;
+ inode->i_ctime = t;
+ inode->i_mtime = t;
+ inode->i_atime = t;
+ inode->i_flags |= S_NOATIME;
+ inode->i_uid = make_kuid(&init_user_ns, status->owner);
+ inode->i_gid = make_kgid(&init_user_ns, status->group);
+ set_nlink(&vnode->netfs.inode, status->nlink);
+
+ switch (status->type) {
+ case AFS_FTYPE_FILE:
+ inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
+ inode->i_op = &afs_file_inode_operations;
+ inode->i_fop = &afs_file_operations;
+ inode->i_mapping->a_ops = &afs_file_aops;
+ mapping_set_large_folios(inode->i_mapping);
+ break;
+ case AFS_FTYPE_DIR:
+ inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
+ inode->i_op = &afs_dir_inode_operations;
+ inode->i_fop = &afs_dir_file_operations;
+ inode->i_mapping->a_ops = &afs_dir_aops;
+ mapping_set_large_folios(inode->i_mapping);
+ break;
+ case AFS_FTYPE_SYMLINK:
+ /* Symlinks with a mode of 0644 are actually mountpoints. */
+ if ((status->mode & 0777) == 0644) {
+ inode->i_flags |= S_AUTOMOUNT;
+
+ set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
+
+ inode->i_mode = S_IFDIR | 0555;
+ inode->i_op = &afs_mntpt_inode_operations;
+ inode->i_fop = &afs_mntpt_file_operations;
+ inode->i_mapping->a_ops = &afs_symlink_aops;
+ } else {
+ inode->i_mode = S_IFLNK | status->mode;
+ inode->i_op = &afs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &afs_symlink_aops;
+ }
+ inode_nohighmem(inode);
+ break;
+ default:
+ dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
+ write_sequnlock(&vnode->cb_lock);
+ return afs_protocol_error(NULL, afs_eproto_file_type);
+ }
+
+ afs_set_i_size(vnode, status->size);
+ afs_set_netfs_context(vnode);
+
+ vnode->invalid_before = status->data_version;
+ inode_set_iversion_raw(&vnode->netfs.inode, status->data_version);
+
+ if (!vp->scb.have_cb) {
+ /* it's a symlink we just created (the fileserver
+ * didn't give us a callback) */
+ vnode->cb_expires_at = ktime_get_real_seconds();
+ } else {
+ vnode->cb_expires_at = vp->scb.callback.expires_at;
+ vnode->cb_server = op->server;
+ set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ }
+
+ write_sequnlock(&vnode->cb_lock);
+ return 0;
+}
+
+/*
+ * Update the core inode struct from a returned status record.
+ */
+static void afs_apply_status(struct afs_operation *op,
+ struct afs_vnode_param *vp)
+{
+ struct afs_file_status *status = &vp->scb.status;
+ struct afs_vnode *vnode = vp->vnode;
+ struct inode *inode = &vnode->netfs.inode;
+ struct timespec64 t;
+ umode_t mode;
+ bool data_changed = false;
+ bool change_size = vp->set_size;
+
+ _enter("{%llx:%llu.%u} %s",
+ vp->fid.vid, vp->fid.vnode, vp->fid.unique,
+ op->type ? op->type->name : "???");
+
+ BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
+
+ if (status->type != vnode->status.type) {
+ pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique,
+ status->type, vnode->status.type);
+ afs_protocol_error(NULL, afs_eproto_bad_status);
+ return;
+ }
+
+ if (status->nlink != vnode->status.nlink)
+ set_nlink(inode, status->nlink);
+
+ if (status->owner != vnode->status.owner)
+ inode->i_uid = make_kuid(&init_user_ns, status->owner);
+
+ if (status->group != vnode->status.group)
+ inode->i_gid = make_kgid(&init_user_ns, status->group);
+
+ if (status->mode != vnode->status.mode) {
+ mode = inode->i_mode;
+ mode &= ~S_IALLUGO;
+ mode |= status->mode & S_IALLUGO;
+ WRITE_ONCE(inode->i_mode, mode);
+ }
+
+ t = status->mtime_client;
+ inode->i_mtime = t;
+ if (vp->update_ctime)
+ inode->i_ctime = op->ctime;
+
+ if (vnode->status.data_version != status->data_version)
+ data_changed = true;
+
+ vnode->status = *status;
+
+ if (vp->dv_before + vp->dv_delta != status->data_version) {
+ if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
+ pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n",
+ vnode->fid.vid, vnode->fid.vnode,
+ (unsigned long long)vp->dv_before + vp->dv_delta,
+ (unsigned long long)status->data_version,
+ op->type ? op->type->name : "???",
+ op->debug_id);
+
+ vnode->invalid_before = status->data_version;
+ if (vnode->status.type == AFS_FTYPE_DIR) {
+ if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
+ afs_stat_v(vnode, n_inval);
+ } else {
+ set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
+ }
+ change_size = true;
+ data_changed = true;
+ } else if (vnode->status.type == AFS_FTYPE_DIR) {
+ /* Expected directory change is handled elsewhere so
+ * that we can locally edit the directory and save on a
+ * download.
+ */
+ if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
+ data_changed = false;
+ change_size = true;
+ }
+
+ if (data_changed) {
+ inode_set_iversion_raw(inode, status->data_version);
+
+ /* Only update the size if the data version jumped. If the
+ * file is being modified locally, then we might have our own
+ * idea of what the size should be that's not the same as
+ * what's on the server.
+ */
+ vnode->netfs.remote_i_size = status->size;
+ if (change_size) {
+ afs_set_i_size(vnode, status->size);
+ inode->i_ctime = t;
+ inode->i_atime = t;
+ }
+ }
+}
+
+/*
+ * Apply a callback to a vnode.
+ */
+static void afs_apply_callback(struct afs_operation *op,
+ struct afs_vnode_param *vp)
+{
+ struct afs_callback *cb = &vp->scb.callback;
+ struct afs_vnode *vnode = vp->vnode;
+
+ if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
+ vnode->cb_expires_at = cb->expires_at;
+ vnode->cb_server = op->server;
+ set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ }
+}
+
+/*
+ * Apply the received status and callback to an inode all in the same critical
+ * section to avoid races with afs_validate().
+ */
+void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
+{
+ struct afs_vnode *vnode = vp->vnode;
+
+ _enter("");
+
+ write_seqlock(&vnode->cb_lock);
+
+ if (vp->scb.have_error) {
+ /* A YFS server will return this from RemoveFile2 and AFS and
+ * YFS will return this from InlineBulkStatus.
+ */
+ if (vp->scb.status.abort_code == VNOVNODE) {
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ clear_nlink(&vnode->netfs.inode);
+ __afs_break_callback(vnode, afs_cb_break_for_deleted);
+ op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
+ }
+ } else if (vp->scb.have_status) {
+ if (vp->speculative &&
+ (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) ||
+ vp->dv_before != vnode->status.data_version))
+ /* Ignore the result of a speculative bulk status fetch
+ * if it splits around a modification op, thereby
+ * appearing to regress the data version.
+ */
+ goto out;
+ afs_apply_status(op, vp);
+ if (vp->scb.have_cb)
+ afs_apply_callback(op, vp);
+ } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+ 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_deleted);
+ }
+ }
+
+out:
+ write_sequnlock(&vnode->cb_lock);
+
+ if (vp->scb.have_status)
+ afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
+}
+
+static void afs_fetch_status_success(struct afs_operation *op)
+{
+ struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
+ struct afs_vnode *vnode = vp->vnode;
+ int ret;
+
+ if (vnode->netfs.inode.i_state & I_NEW) {
+ ret = afs_inode_init_from_status(op, vp, vnode);
+ op->error = ret;
+ if (ret == 0)
+ afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
+ } else {
+ afs_vnode_commit_status(op, vp);
+ }
+}
+
+const struct afs_operation_ops afs_fetch_status_operation = {
+ .issue_afs_rpc = afs_fs_fetch_status,
+ .issue_yfs_rpc = yfs_fs_fetch_status,
+ .success = afs_fetch_status_success,
+ .aborted = afs_check_for_remote_deletion,
+};
+
+/*
+ * Fetch file status from the volume.
+ */
+int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
+ afs_access_t *_caller_access)
+{
+ struct afs_operation *op;
+
+ _enter("%s,{%llx:%llu.%u,S=%lx}",
+ vnode->volume->name,
+ vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
+ vnode->flags);
+
+ op = afs_alloc_operation(key, vnode->volume);
+ if (IS_ERR(op))
+ return PTR_ERR(op);
+
+ afs_op_set_vnode(op, 0, vnode);
+
+ op->nr_files = 1;
+ op->ops = &afs_fetch_status_operation;
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+
+ if (_caller_access)
+ *_caller_access = op->file[0].scb.status.caller_access;
+ return afs_put_operation(op);
+}
+
+/*
+ * ilookup() comparator
+ */
+int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
+{
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+ struct afs_fid *fid = opaque;
+
+ return (fid->vnode == vnode->fid.vnode &&
+ fid->vnode_hi == vnode->fid.vnode_hi &&
+ fid->unique == vnode->fid.unique);
+}
+
+/*
+ * iget5() comparator
+ */
+static int afs_iget5_test(struct inode *inode, void *opaque)
+{
+ struct afs_vnode_param *vp = opaque;
+ //struct afs_vnode *vnode = AFS_FS_I(inode);
+
+ return afs_ilookup5_test_by_fid(inode, &vp->fid);
+}
+
+/*
+ * iget5() inode initialiser
+ */
+static int afs_iget5_set(struct inode *inode, void *opaque)
+{
+ struct afs_vnode_param *vp = opaque;
+ struct afs_super_info *as = AFS_FS_S(inode->i_sb);
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+
+ vnode->volume = as->volume;
+ vnode->fid = vp->fid;
+
+ /* YFS supports 96-bit vnode IDs, but Linux only supports
+ * 64-bit inode numbers.
+ */
+ inode->i_ino = vnode->fid.vnode;
+ inode->i_generation = vnode->fid.unique;
+ return 0;
+}
+
+/*
+ * Get a cache cookie for an inode.
+ */
+static void afs_get_inode_cache(struct afs_vnode *vnode)
+{
+#ifdef CONFIG_AFS_FSCACHE
+ struct {
+ __be32 vnode_id;
+ __be32 unique;
+ __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */
+ } __packed key;
+ struct afs_vnode_cache_aux aux;
+
+ if (vnode->status.type != AFS_FTYPE_FILE) {
+ vnode->netfs.cache = NULL;
+ return;
+ }
+
+ key.vnode_id = htonl(vnode->fid.vnode);
+ key.unique = htonl(vnode->fid.unique);
+ key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32);
+ key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi);
+ afs_set_cache_aux(vnode, &aux);
+
+ afs_vnode_set_cache(vnode,
+ fscache_acquire_cookie(
+ vnode->volume->cache,
+ vnode->status.type == AFS_FTYPE_FILE ?
+ 0 : FSCACHE_ADV_SINGLE_CHUNK,
+ &key, sizeof(key),
+ &aux, sizeof(aux),
+ i_size_read(&vnode->netfs.inode)));
+#endif
+}
+
+/*
+ * inode retrieval
+ */
+struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
+{
+ struct afs_vnode_param *dvp = &op->file[0];
+ struct super_block *sb = dvp->vnode->netfs.inode.i_sb;
+ struct afs_vnode *vnode;
+ struct inode *inode;
+ int ret;
+
+ _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
+
+ inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
+ if (!inode) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ vnode = AFS_FS_I(inode);
+
+ _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
+ inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
+
+ /* deal with an existing inode */
+ if (!(inode->i_state & I_NEW)) {
+ _leave(" = %p", inode);
+ return inode;
+ }
+
+ ret = afs_inode_init_from_status(op, vp, vnode);
+ if (ret < 0)
+ goto bad_inode;
+
+ afs_get_inode_cache(vnode);
+
+ /* success */
+ clear_bit(AFS_VNODE_UNSET, &vnode->flags);
+ unlock_new_inode(inode);
+ _leave(" = %p", inode);
+ return inode;
+
+ /* failure */
+bad_inode:
+ iget_failed(inode);
+ _leave(" = %d [bad]", ret);
+ return ERR_PTR(ret);
+}
+
+static int afs_iget5_set_root(struct inode *inode, void *opaque)
+{
+ struct afs_super_info *as = AFS_FS_S(inode->i_sb);
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+
+ vnode->volume = as->volume;
+ vnode->fid.vid = as->volume->vid,
+ vnode->fid.vnode = 1;
+ vnode->fid.unique = 1;
+ inode->i_ino = 1;
+ inode->i_generation = 1;
+ return 0;
+}
+
+/*
+ * Set up the root inode for a volume. This is always vnode 1, unique 1 within
+ * the volume.
+ */
+struct inode *afs_root_iget(struct super_block *sb, struct key *key)
+{
+ struct afs_super_info *as = AFS_FS_S(sb);
+ struct afs_operation *op;
+ struct afs_vnode *vnode;
+ struct inode *inode;
+ int ret;
+
+ _enter(",{%llx},,", as->volume->vid);
+
+ inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
+ if (!inode) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
+
+ BUG_ON(!(inode->i_state & I_NEW));
+
+ vnode = AFS_FS_I(inode);
+ vnode->cb_v_break = as->volume->cb_v_break,
+ afs_set_netfs_context(vnode);
+
+ op = afs_alloc_operation(key, as->volume);
+ if (IS_ERR(op)) {
+ ret = PTR_ERR(op);
+ goto error;
+ }
+
+ afs_op_set_vnode(op, 0, vnode);
+
+ op->nr_files = 1;
+ op->ops = &afs_fetch_status_operation;
+ ret = afs_do_sync_operation(op);
+ if (ret < 0)
+ goto error;
+
+ afs_get_inode_cache(vnode);
+
+ clear_bit(AFS_VNODE_UNSET, &vnode->flags);
+ unlock_new_inode(inode);
+ _leave(" = %p", inode);
+ return inode;
+
+error:
+ iget_failed(inode);
+ _leave(" = %d [bad]", ret);
+ return ERR_PTR(ret);
+}
+
+/*
+ * mark the data attached to an inode as obsolete due to a write on the server
+ * - might also want to ditch all the outstanding writes and dirty pages
+ */
+static void afs_zap_data(struct afs_vnode *vnode)
+{
+ _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
+
+ afs_invalidate_cache(vnode, 0);
+
+ /* nuke all the non-dirty pages that aren't locked, mapped or being
+ * written back in a regular file and completely discard the pages in a
+ * directory or symlink */
+ if (S_ISREG(vnode->netfs.inode.i_mode))
+ invalidate_remote_inode(&vnode->netfs.inode);
+ else
+ invalidate_inode_pages2(vnode->netfs.inode.i_mapping);
+}
+
+/*
+ * Check to see if we have a server currently serving this volume and that it
+ * hasn't been reinitialised or dropped from the list.
+ */
+static bool afs_check_server_good(struct afs_vnode *vnode)
+{
+ struct afs_server_list *slist;
+ struct afs_server *server;
+ bool good;
+ int i;
+
+ if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break))
+ return true;
+
+ rcu_read_lock();
+
+ slist = rcu_dereference(vnode->volume->servers);
+ for (i = 0; i < slist->nr_servers; i++) {
+ server = slist->servers[i].server;
+ if (server == vnode->cb_server) {
+ good = (vnode->cb_s_break == server->cb_s_break);
+ rcu_read_unlock();
+ return good;
+ }
+ }
+
+ rcu_read_unlock();
+ return false;
+}
+
+/*
+ * Check the validity of a vnode/inode.
+ */
+bool afs_check_validity(struct afs_vnode *vnode)
+{
+ enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
+ time64_t now = ktime_get_real_seconds();
+ unsigned int cb_break;
+ int seq = 0;
+
+ do {
+ read_seqbegin_or_lock(&vnode->cb_lock, &seq);
+ cb_break = vnode->cb_break;
+
+ if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
+ if (vnode->cb_v_break != vnode->volume->cb_v_break)
+ need_clear = afs_cb_break_for_v_break;
+ else if (!afs_check_server_good(vnode))
+ need_clear = afs_cb_break_for_s_reinit;
+ else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
+ need_clear = afs_cb_break_for_zap;
+ else if (vnode->cb_expires_at - 10 <= now)
+ need_clear = afs_cb_break_for_lapsed;
+ } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ ;
+ } else {
+ need_clear = afs_cb_break_no_promise;
+ }
+
+ } while (need_seqretry(&vnode->cb_lock, seq));
+
+ done_seqretry(&vnode->cb_lock, seq);
+
+ if (need_clear == afs_cb_break_no_break)
+ return true;
+
+ write_seqlock(&vnode->cb_lock);
+ if (need_clear == afs_cb_break_no_promise)
+ vnode->cb_v_break = vnode->volume->cb_v_break;
+ else if (cb_break == vnode->cb_break)
+ __afs_break_callback(vnode, need_clear);
+ else
+ trace_afs_cb_miss(&vnode->fid, need_clear);
+ write_sequnlock(&vnode->cb_lock);
+ return false;
+}
+
+/*
+ * validate a vnode/inode
+ * - there are several things we need to check
+ * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
+ * symlink)
+ * - parent dir metadata changed (security changes)
+ * - dentry data changed (write, truncate)
+ * - dentry metadata changed (security changes)
+ */
+int afs_validate(struct afs_vnode *vnode, struct key *key)
+{
+ int ret;
+
+ _enter("{v={%llx:%llu} fl=%lx},%x",
+ vnode->fid.vid, vnode->fid.vnode, vnode->flags,
+ key_serial(key));
+
+ if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) {
+ if (vnode->netfs.inode.i_nlink)
+ clear_nlink(&vnode->netfs.inode);
+ goto valid;
+ }
+
+ if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) &&
+ afs_check_validity(vnode))
+ goto valid;
+
+ down_write(&vnode->validate_lock);
+
+ /* if the promise has expired, we need to check the server again to get
+ * a new promise - note that if the (parent) directory's metadata was
+ * changed then the security may be different and we may no longer have
+ * access */
+ if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
+ _debug("not promised");
+ ret = afs_fetch_status(vnode, key, false, NULL);
+ if (ret < 0) {
+ if (ret == -ENOENT) {
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ ret = -ESTALE;
+ }
+ goto error_unlock;
+ }
+ _debug("new promise [fl=%lx]", vnode->flags);
+ }
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ _debug("file already deleted");
+ ret = -ESTALE;
+ goto error_unlock;
+ }
+
+ /* if the vnode's data version number changed then its contents are
+ * different */
+ if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
+ afs_zap_data(vnode);
+ up_write(&vnode->validate_lock);
+valid:
+ _leave(" = 0");
+ return 0;
+
+error_unlock:
+ up_write(&vnode->validate_lock);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * read the attributes of an inode
+ */
+int afs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+ struct kstat *stat, u32 request_mask, unsigned int query_flags)
+{
+ struct inode *inode = d_inode(path->dentry);
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+ struct key *key;
+ int ret, seq = 0;
+
+ _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
+
+ if (vnode->volume &&
+ !(query_flags & AT_STATX_DONT_SYNC) &&
+ !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
+ key = afs_request_key(vnode->volume->cell);
+ if (IS_ERR(key))
+ return PTR_ERR(key);
+ ret = afs_validate(vnode, key);
+ key_put(key);
+ if (ret < 0)
+ return ret;
+ }
+
+ do {
+ read_seqbegin_or_lock(&vnode->cb_lock, &seq);
+ generic_fillattr(&init_user_ns, inode, stat);
+ if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
+ stat->nlink > 0)
+ stat->nlink -= 1;
+
+ /* Lie about the size of directories. We maintain a locally
+ * edited copy and may make different allocation decisions on
+ * it, but we need to give userspace the server's size.
+ */
+ if (S_ISDIR(inode->i_mode))
+ stat->size = vnode->netfs.remote_i_size;
+ } while (need_seqretry(&vnode->cb_lock, seq));
+
+ done_seqretry(&vnode->cb_lock, seq);
+ return 0;
+}
+
+/*
+ * discard an AFS inode
+ */
+int afs_drop_inode(struct inode *inode)
+{
+ _enter("");
+
+ if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
+ return generic_delete_inode(inode);
+ else
+ return generic_drop_inode(inode);
+}
+
+/*
+ * clear an AFS inode
+ */
+void afs_evict_inode(struct inode *inode)
+{
+ struct afs_vnode_cache_aux aux;
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+
+ _enter("{%llx:%llu.%d}",
+ vnode->fid.vid,
+ vnode->fid.vnode,
+ vnode->fid.unique);
+
+ _debug("CLEAR INODE %p", inode);
+
+ ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
+
+ truncate_inode_pages_final(&inode->i_data);
+
+ afs_set_cache_aux(vnode, &aux);
+ fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux);
+ clear_inode(inode);
+
+ while (!list_empty(&vnode->wb_keys)) {
+ struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
+ struct afs_wb_key, vnode_link);
+ list_del(&wbk->vnode_link);
+ afs_put_wb_key(wbk);
+ }
+
+ fscache_relinquish_cookie(afs_vnode_cache(vnode),
+ test_bit(AFS_VNODE_DELETED, &vnode->flags));
+
+ afs_prune_wb_keys(vnode);
+ afs_put_permits(rcu_access_pointer(vnode->permit_cache));
+ key_put(vnode->silly_key);
+ vnode->silly_key = NULL;
+ key_put(vnode->lock_key);
+ vnode->lock_key = NULL;
+ _leave("");
+}
+
+static void afs_setattr_success(struct afs_operation *op)
+{
+ struct afs_vnode_param *vp = &op->file[0];
+ struct inode *inode = &vp->vnode->netfs.inode;
+ loff_t old_i_size = i_size_read(inode);
+
+ op->setattr.old_i_size = old_i_size;
+ afs_vnode_commit_status(op, vp);
+ /* inode->i_size has now been changed. */
+
+ if (op->setattr.attr->ia_valid & ATTR_SIZE) {
+ loff_t size = op->setattr.attr->ia_size;
+ if (size > old_i_size)
+ pagecache_isize_extended(inode, old_i_size, size);
+ }
+}
+
+static void afs_setattr_edit_file(struct afs_operation *op)
+{
+ struct afs_vnode_param *vp = &op->file[0];
+ struct inode *inode = &vp->vnode->netfs.inode;
+
+ if (op->setattr.attr->ia_valid & ATTR_SIZE) {
+ loff_t size = op->setattr.attr->ia_size;
+ loff_t i_size = op->setattr.old_i_size;
+
+ if (size < i_size)
+ truncate_pagecache(inode, size);
+ if (size != i_size)
+ fscache_resize_cookie(afs_vnode_cache(vp->vnode),
+ vp->scb.status.size);
+ }
+}
+
+static const struct afs_operation_ops afs_setattr_operation = {
+ .issue_afs_rpc = afs_fs_setattr,
+ .issue_yfs_rpc = yfs_fs_setattr,
+ .success = afs_setattr_success,
+ .edit_dir = afs_setattr_edit_file,
+};
+
+/*
+ * set the attributes of an inode
+ */
+int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+ struct iattr *attr)
+{
+ const unsigned int supported =
+ ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
+ ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
+ struct afs_operation *op;
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+ struct inode *inode = &vnode->netfs.inode;
+ loff_t i_size;
+ int ret;
+
+ _enter("{%llx:%llu},{n=%pd},%x",
+ vnode->fid.vid, vnode->fid.vnode, dentry,
+ attr->ia_valid);
+
+ if (!(attr->ia_valid & supported)) {
+ _leave(" = 0 [unsupported]");
+ return 0;
+ }
+
+ i_size = i_size_read(inode);
+ if (attr->ia_valid & ATTR_SIZE) {
+ if (!S_ISREG(inode->i_mode))
+ return -EISDIR;
+
+ ret = inode_newsize_ok(inode, attr->ia_size);
+ if (ret)
+ return ret;
+
+ if (attr->ia_size == i_size)
+ attr->ia_valid &= ~ATTR_SIZE;
+ }
+
+ fscache_use_cookie(afs_vnode_cache(vnode), true);
+
+ /* Prevent any new writebacks from starting whilst we do this. */
+ down_write(&vnode->validate_lock);
+
+ if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
+ loff_t size = attr->ia_size;
+
+ /* Wait for any outstanding writes to the server to complete */
+ loff_t from = min(size, i_size);
+ loff_t to = max(size, i_size);
+ ret = filemap_fdatawait_range(inode->i_mapping, from, to);
+ if (ret < 0)
+ goto out_unlock;
+
+ /* Don't talk to the server if we're just shortening in-memory
+ * writes that haven't gone to the server yet.
+ */
+ if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
+ attr->ia_size < i_size &&
+ attr->ia_size > vnode->status.size) {
+ truncate_pagecache(inode, attr->ia_size);
+ fscache_resize_cookie(afs_vnode_cache(vnode),
+ attr->ia_size);
+ i_size_write(inode, attr->ia_size);
+ ret = 0;
+ goto out_unlock;
+ }
+ }
+
+ op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
+ afs_file_key(attr->ia_file) : NULL),
+ vnode->volume);
+ if (IS_ERR(op)) {
+ ret = PTR_ERR(op);
+ goto out_unlock;
+ }
+
+ afs_op_set_vnode(op, 0, vnode);
+ op->setattr.attr = attr;
+
+ if (attr->ia_valid & ATTR_SIZE) {
+ op->file[0].dv_delta = 1;
+ op->file[0].set_size = true;
+ }
+ op->ctime = attr->ia_ctime;
+ op->file[0].update_ctime = 1;
+ op->file[0].modification = true;
+
+ op->ops = &afs_setattr_operation;
+ ret = afs_do_sync_operation(op);
+
+out_unlock:
+ up_write(&vnode->validate_lock);
+ fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
+ _leave(" = %d", ret);
+ return ret;
+}