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- /*
- * 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();
- }
- /*
- * 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->vfs_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_fs_aops;
- 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;
- 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_fs_aops;
- } else {
- inode->i_mode = S_IFLNK | status->mode;
- inode->i_op = &afs_symlink_inode_operations;
- inode->i_mapping->a_ops = &afs_fs_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);
- vnode->invalid_before = status->data_version;
- inode_set_iversion_raw(&vnode->vfs_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->vfs_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\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 : "???");
- 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;
- } 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.
- */
- 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->vfs_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->vfs_inode);
- if (vnode->vfs_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->vfs_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 {
- u32 vnode_id;
- u32 unique;
- u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
- } __packed key;
- struct afs_vnode_cache_aux aux;
- if (vnode->status.type == AFS_FTYPE_DIR) {
- vnode->cache = NULL;
- return;
- }
- key.vnode_id = vnode->fid.vnode;
- key.unique = vnode->fid.unique;
- key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
- key.vnode_id_ext[1] = vnode->fid.vnode_hi;
- aux.data_version = vnode->status.data_version;
- vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
- &afs_vnode_cache_index_def,
- &key, sizeof(key),
- &aux, sizeof(aux),
- vnode, vnode->status.size, true);
- #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->vfs_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,
- 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);
- #ifdef CONFIG_AFS_FSCACHE
- fscache_invalidate(vnode->cache);
- #endif
- /* 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->vfs_inode.i_mode))
- invalidate_remote_inode(&vnode->vfs_inode);
- else
- invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
- }
- /*
- * Get the server reinit counter for a vnode's current server.
- */
- static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break)
- {
- struct afs_server_list *slist = rcu_dereference(vnode->volume->servers);
- struct afs_server *server;
- int i;
- for (i = 0; i < slist->nr_servers; i++) {
- server = slist->servers[i].server;
- if (server == vnode->cb_server) {
- *_s_break = READ_ONCE(server->cb_s_break);
- return true;
- }
- }
- return false;
- }
- /*
- * Check the validity of a vnode/inode.
- */
- bool afs_check_validity(struct afs_vnode *vnode)
- {
- struct afs_volume *volume = vnode->volume;
- enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
- time64_t now = ktime_get_real_seconds();
- bool valid;
- unsigned int cb_break, cb_s_break, cb_v_break;
- int seq = 0;
- do {
- read_seqbegin_or_lock(&vnode->cb_lock, &seq);
- cb_v_break = READ_ONCE(volume->cb_v_break);
- cb_break = vnode->cb_break;
- if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) &&
- afs_get_s_break_rcu(vnode, &cb_s_break)) {
- if (vnode->cb_s_break != cb_s_break ||
- vnode->cb_v_break != cb_v_break) {
- vnode->cb_s_break = cb_s_break;
- vnode->cb_v_break = cb_v_break;
- need_clear = afs_cb_break_for_vsbreak;
- valid = false;
- } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
- need_clear = afs_cb_break_for_zap;
- valid = false;
- } else if (vnode->cb_expires_at - 10 <= now) {
- need_clear = afs_cb_break_for_lapsed;
- valid = false;
- } else {
- valid = true;
- }
- } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
- valid = true;
- } else {
- vnode->cb_v_break = cb_v_break;
- valid = false;
- }
- } while (need_seqretry(&vnode->cb_lock, seq));
- done_seqretry(&vnode->cb_lock, seq);
- if (need_clear != afs_cb_break_no_break) {
- write_seqlock(&vnode->cb_lock);
- 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);
- valid = false;
- }
- return valid;
- }
- /*
- * 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)
- {
- bool valid;
- int ret;
- _enter("{v={%llx:%llu} fl=%lx},%x",
- vnode->fid.vid, vnode->fid.vnode, vnode->flags,
- key_serial(key));
- rcu_read_lock();
- valid = afs_check_validity(vnode);
- rcu_read_unlock();
- if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
- clear_nlink(&vnode->vfs_inode);
- if (valid)
- 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(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);
- int seq = 0;
- _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
- do {
- read_seqbegin_or_lock(&vnode->cb_lock, &seq);
- generic_fillattr(inode, stat);
- if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
- stat->nlink > 0)
- stat->nlink -= 1;
- } 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 *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);
- 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);
- }
- #ifdef CONFIG_AFS_FSCACHE
- {
- struct afs_vnode_cache_aux aux;
- aux.data_version = vnode->status.data_version;
- fscache_relinquish_cookie(vnode->cache, &aux,
- test_bit(AFS_VNODE_DELETED, &vnode->flags));
- vnode->cache = NULL;
- }
- #endif
- 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->vfs_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->vfs_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);
- }
- }
- 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 dentry *dentry, struct iattr *attr)
- {
- struct afs_operation *op;
- struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
- int ret;
- _enter("{%llx:%llu},{n=%pd},%x",
- vnode->fid.vid, vnode->fid.vnode, dentry,
- attr->ia_valid);
- if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
- ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET |
- ATTR_TOUCH))) {
- _leave(" = 0 [unsupported]");
- return 0;
- }
- if (attr->ia_valid & ATTR_SIZE) {
- if (!S_ISREG(vnode->vfs_inode.i_mode))
- return -EISDIR;
- ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size);
- if (ret)
- return ret;
- if (attr->ia_size == i_size_read(&vnode->vfs_inode))
- attr->ia_valid &= ~ATTR_SIZE;
- }
- /* flush any dirty data outstanding on a regular file */
- if (S_ISREG(vnode->vfs_inode.i_mode))
- filemap_write_and_wait(vnode->vfs_inode.i_mapping);
- /* Prevent any new writebacks from starting whilst we do this. */
- down_write(&vnode->validate_lock);
- 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);
- _leave(" = %d", ret);
- return ret;
- }
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