int fuse_update_attributes(struct inode *inode, struct kstat *stat,
struct file *file, bool *refreshed)
{
struct fuse_inode *fi = get_fuse_inode(inode);
int err;
bool r;
if (time_before64(fi->i_time, get_jiffies_64())) {
r = true;
forget_all_cached_acls(inode);
err = fuse_do_getattr(inode, stat, file);
} else {
r = false;
err = 0;
if (stat) {
generic_fillattr(inode, stat);
stat->mode = fi->orig_i_mode;
stat->ino = fi->orig_ino;
}
}
if (refreshed != NULL)
*refreshed = r;
return err;
}
static int fuse_update_get_attr(struct inode *inode, struct file *file,
struct kstat *stat, u32 request_mask,
unsigned int flags)
{
struct fuse_inode *fi = get_fuse_inode(inode);
int err = 0;
bool sync;
if (flags & AT_STATX_FORCE_SYNC)
sync = true;
else if (flags & AT_STATX_DONT_SYNC)
sync = false;
else if (request_mask & READ_ONCE(fi->inval_mask))
sync = true;
else
sync = time_before64(fi->i_time, get_jiffies_64());
if (sync) {
forget_all_cached_acls(inode);
err = fuse_do_getattr(inode, stat, file);
} else if (stat) {
generic_fillattr(inode, stat);
stat->mode = fi->orig_i_mode;
stat->ino = fi->orig_ino;
}
return err;
}
static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
struct gfs2_inode *ip = gfs2_glock2inode(gl);
gfs2_assert_withdraw(gl->gl_name.ln_sbd, !atomic_read(&gl->gl_ail_count));
if (flags & DIO_METADATA) {
struct address_space *mapping = gfs2_glock2aspace(gl);
truncate_inode_pages(mapping, 0);
if (ip) {
set_bit(GIF_INVALID, &ip->i_flags);
forget_all_cached_acls(&ip->i_inode);
security_inode_invalidate_secctx(&ip->i_inode);
gfs2_dir_hash_inval(ip);
}
}
if (ip == GFS2_I(gl->gl_name.ln_sbd->sd_rindex)) {
gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
GFS2_LOG_HEAD_FLUSH_NORMAL |
GFS2_LFC_INODE_GO_INVAL);
gl->gl_name.ln_sbd->sd_rindex_uptodate = 0;
}
if (ip && S_ISREG(ip->i_inode.i_mode))
truncate_inode_pages(ip->i_inode.i_mapping, 0);
gfs2_clear_glop_pending(ip);
}
static int fuse_perm_getattr(struct inode *inode, int mask)
{
if (mask & MAY_NOT_BLOCK)
return -ECHILD;
forget_all_cached_acls(inode);
return fuse_do_getattr(inode, NULL, NULL);
}
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
struct inode *inode = d_inode(entry);
struct fuse_conn *fc = get_fuse_conn(inode);
struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL;
int ret;
if (!fuse_allow_current_process(get_fuse_conn(inode)))
return -EACCES;
if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) {
attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID |
ATTR_MODE);
/*
* The only sane way to reliably kill suid/sgid is to do it in
* the userspace filesystem
*
* This should be done on write(), truncate() and chown().
*/
if (!fc->handle_killpriv) {
/*
* ia_mode calculation may have used stale i_mode.
* Refresh and recalculate.
*/
ret = fuse_do_getattr(inode, NULL, file);
if (ret)
return ret;
attr->ia_mode = inode->i_mode;
if (inode->i_mode & S_ISUID) {
attr->ia_valid |= ATTR_MODE;
attr->ia_mode &= ~S_ISUID;
}
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
attr->ia_valid |= ATTR_MODE;
attr->ia_mode &= ~S_ISGID;
}
}
}
if (!attr->ia_valid)
return 0;
ret = fuse_do_setattr(entry, attr, file);
if (!ret) {
/*
* If filesystem supports acls it may have updated acl xattrs in
* the filesystem, so forget cached acls for the inode.
*/
if (fc->posix_acl)
forget_all_cached_acls(inode);
/* Directory mode changed, may need to revalidate access */
if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE))
fuse_invalidate_entry_cache(entry);
}
return ret;
}
int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
struct fuse_conn *fc = get_fuse_conn(inode);
const char *name;
int ret;
if (!fc->posix_acl || fc->no_setxattr)
return -EOPNOTSUPP;
if (type == ACL_TYPE_ACCESS)
name = XATTR_NAME_POSIX_ACL_ACCESS;
else if (type == ACL_TYPE_DEFAULT)
name = XATTR_NAME_POSIX_ACL_DEFAULT;
else
return -EINVAL;
if (acl) {
/*
* Fuse userspace is responsible for updating access
* permissions in the inode, if needed. fuse_setxattr
* invalidates the inode attributes, which will force
* them to be refreshed the next time they are used,
* and it also updates i_ctime.
*/
size_t size = posix_acl_xattr_size(acl->a_count);
void *value;
if (size > PAGE_SIZE)
return -E2BIG;
value = kmalloc(size, GFP_KERNEL);
if (!value)
return -ENOMEM;
ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
if (ret < 0) {
kfree(value);
return ret;
}
ret = fuse_setxattr(inode, name, value, size, 0);
kfree(value);
} else {
ret = fuse_removexattr(inode, name);
}
forget_all_cached_acls(inode);
fuse_invalidate_attr(inode);
return ret;
}
static int fuse_update_get_attr(struct inode *inode, struct file *file,
struct kstat *stat)
{
struct fuse_inode *fi = get_fuse_inode(inode);
int err = 0;
if (time_before64(fi->i_time, get_jiffies_64())) {
forget_all_cached_acls(inode);
err = fuse_do_getattr(inode, stat, file);
} else if (stat) {
generic_fillattr(inode, stat);
stat->mode = fi->orig_i_mode;
stat->ino = fi->orig_ino;
}
return err;
}
static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
struct gfs2_inode *ip = gl->gl_object;
gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
if (flags & DIO_METADATA) {
struct address_space *mapping = gfs2_glock2aspace(gl);
truncate_inode_pages(mapping, 0);
if (ip) {
set_bit(GIF_INVALID, &ip->i_flags);
forget_all_cached_acls(&ip->i_inode);
}
}
if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
gl->gl_sbd->sd_rindex_uptodate = 0;
if (ip && S_ISREG(ip->i_inode.i_mode))
truncate_inode_pages(ip->i_inode.i_mapping, 0);
}
int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
loff_t offset, loff_t len)
{
struct inode *inode;
pgoff_t pg_start;
pgoff_t pg_end;
inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
if (!inode)
return -ENOENT;
fuse_invalidate_attr(inode);
forget_all_cached_acls(inode);
if (offset >= 0) {
pg_start = offset >> PAGE_SHIFT;
if (len <= 0)
pg_end = -1;
else
pg_end = (offset + len - 1) >> PAGE_SHIFT;
invalidate_inode_pages2_range(inode->i_mapping,
pg_start, pg_end);
}
/*
* Check whether the dentry is still valid
*
* If the entry validity timeout has expired and the dentry is
* positive, try to redo the lookup. If the lookup results in a
* different inode, then let the VFS invalidate the dentry and redo
* the lookup once more. If the lookup results in the same inode,
* then refresh the attributes, timeouts and mark the dentry valid.
*/
static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
{
struct inode *inode;
struct dentry *parent;
struct fuse_conn *fc;
struct fuse_inode *fi;
int ret;
inode = d_inode_rcu(entry);
if (inode && is_bad_inode(inode))
goto invalid;
else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
(flags & LOOKUP_REVAL)) {
struct fuse_entry_out outarg;
FUSE_ARGS(args);
struct fuse_forget_link *forget;
u64 attr_version;
/* For negative dentries, always do a fresh lookup */
if (!inode)
goto invalid;
ret = -ECHILD;
if (flags & LOOKUP_RCU)
goto out;
fc = get_fuse_conn(inode);
forget = fuse_alloc_forget();
ret = -ENOMEM;
if (!forget)
goto out;
attr_version = fuse_get_attr_version(fc);
parent = dget_parent(entry);
fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)),
&entry->d_name, &outarg);
ret = fuse_simple_request(fc, &args);
dput(parent);
/* Zero nodeid is same as -ENOENT */
if (!ret && !outarg.nodeid)
ret = -ENOENT;
if (!ret) {
fi = get_fuse_inode(inode);
if (outarg.nodeid != get_node_id(inode)) {
fuse_queue_forget(fc, forget, outarg.nodeid, 1);
goto invalid;
}
spin_lock(&fc->lock);
fi->nlookup++;
spin_unlock(&fc->lock);
}
kfree(forget);
if (ret == -ENOMEM)
goto out;
if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
goto invalid;
forget_all_cached_acls(inode);
fuse_change_attributes(inode, &outarg.attr,
entry_attr_timeout(&outarg),
attr_version);
fuse_change_entry_timeout(entry, &outarg);
} else if (inode) {
fi = get_fuse_inode(inode);
if (flags & LOOKUP_RCU) {
if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
return -ECHILD;
} else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
parent = dget_parent(entry);
fuse_advise_use_readdirplus(d_inode(parent));
dput(parent);
}
}
ret = 1;
out:
return ret;
invalid:
ret = 0;
goto out;
}
static int fuse_direntplus_link(struct file *file,
struct fuse_direntplus *direntplus,
u64 attr_version)
{
struct fuse_entry_out *o = &direntplus->entry_out;
struct fuse_dirent *dirent = &direntplus->dirent;
struct dentry *parent = file->f_path.dentry;
struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
struct dentry *dentry;
struct dentry *alias;
struct inode *dir = d_inode(parent);
struct fuse_conn *fc;
struct inode *inode;
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
if (!o->nodeid) {
/*
* Unlike in the case of fuse_lookup, zero nodeid does not mean
* ENOENT. Instead, it only means the userspace filesystem did
* not want to return attributes/handle for this entry.
*
* So do nothing.
*/
return 0;
}
if (name.name[0] == '.') {
/*
* We could potentially refresh the attributes of the directory
* and its parent?
*/
if (name.len == 1)
return 0;
if (name.name[1] == '.' && name.len == 2)
return 0;
}
if (invalid_nodeid(o->nodeid))
return -EIO;
if (!fuse_valid_type(o->attr.mode))
return -EIO;
fc = get_fuse_conn(dir);
name.hash = full_name_hash(parent, name.name, name.len);
dentry = d_lookup(parent, &name);
if (!dentry) {
retry:
dentry = d_alloc_parallel(parent, &name, &wq);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
}
if (!d_in_lookup(dentry)) {
struct fuse_inode *fi;
inode = d_inode(dentry);
if (!inode ||
get_node_id(inode) != o->nodeid ||
((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
d_invalidate(dentry);
dput(dentry);
goto retry;
}
if (is_bad_inode(inode)) {
dput(dentry);
return -EIO;
}
fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
fi->nlookup++;
spin_unlock(&fc->lock);
forget_all_cached_acls(inode);
fuse_change_attributes(inode, &o->attr,
entry_attr_timeout(o),
attr_version);
/*
* The other branch comes via fuse_iget()
* which bumps nlookup inside
*/
} else {
inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
&o->attr, entry_attr_timeout(o),
attr_version);
if (!inode)
inode = ERR_PTR(-ENOMEM);
alias = d_splice_alias(inode, dentry);
d_lookup_done(dentry);
if (alias) {
dput(dentry);
dentry = alias;
}
if (IS_ERR(dentry))
return PTR_ERR(dentry);
}
if (fc->readdirplus_auto)
set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
fuse_change_entry_timeout(dentry, o);
dput(dentry);
return 0;
}