static int fuse_link(struct dentry *entry, struct inode *newdir,
struct dentry *newent)
{
int err;
struct fuse_link_in inarg;
struct inode *inode = d_inode(entry);
struct fuse_conn *fc = get_fuse_conn(inode);
FUSE_ARGS(args);
memset(&inarg, 0, sizeof(inarg));
inarg.oldnodeid = get_node_id(inode);
args.in.h.opcode = FUSE_LINK;
args.in.numargs = 2;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.in.args[1].size = newent->d_name.len + 1;
args.in.args[1].value = newent->d_name.name;
err = create_new_entry(fc, &args, newdir, newent, inode->i_mode);
/* Contrary to "normal" filesystems it can happen that link
makes two "logical" inodes point to the same "physical"
inode. We invalidate the attributes of the old one, so it
will reflect changes in the backing inode (link count,
etc.)
*/
if (!err) {
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
fi->attr_version = ++fc->attr_version;
inc_nlink(inode);
spin_unlock(&fc->lock);
fuse_invalidate_attr(inode);
fuse_update_ctime(inode);
} else if (err == -EINTR) {
fuse_invalidate_attr(inode);
}
return err;
}
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;
}
int
fuse_vnode_savesize(struct vnode *vp, struct ucred *cred)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct thread *td = curthread;
struct fuse_filehandle *fufh = NULL;
struct fuse_dispatcher fdi;
struct fuse_setattr_in *fsai;
int err = 0;
FS_DEBUG("inode=%ju size=%ju\n", (uintmax_t)VTOI(vp),
(uintmax_t)fvdat->filesize);
ASSERT_VOP_ELOCKED(vp, "fuse_io_extend");
if (fuse_isdeadfs(vp)) {
return EBADF;
}
if (vnode_vtype(vp) == VDIR) {
return EISDIR;
}
if (vfs_isrdonly(vnode_mount(vp))) {
return EROFS;
}
if (cred == NULL) {
cred = td->td_ucred;
}
fdisp_init(&fdi, sizeof(*fsai));
fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
fsai = fdi.indata;
fsai->valid = 0;
/* Truncate to a new value. */
fsai->size = fvdat->filesize;
fsai->valid |= FATTR_SIZE;
fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);
if (fufh) {
fsai->fh = fufh->fh_id;
fsai->valid |= FATTR_FH;
}
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
if (err == 0)
fvdat->flag &= ~FN_SIZECHANGE;
fuse_invalidate_attr(vp);
return err;
}
/*
* Code shared between mknod, mkdir, symlink and link
*/
static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
struct inode *dir, struct dentry *entry,
umode_t mode)
{
struct fuse_entry_out outarg;
struct inode *inode;
int err;
struct fuse_forget_link *forget;
forget = fuse_alloc_forget();
if (!forget)
return -ENOMEM;
memset(&outarg, 0, sizeof(outarg));
args->in.h.nodeid = get_node_id(dir);
args->out.numargs = 1;
args->out.args[0].size = sizeof(outarg);
args->out.args[0].value = &outarg;
err = fuse_simple_request(fc, args);
if (err)
goto out_put_forget_req;
err = -EIO;
if (invalid_nodeid(outarg.nodeid))
goto out_put_forget_req;
if ((outarg.attr.mode ^ mode) & S_IFMT)
goto out_put_forget_req;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr, entry_attr_timeout(&outarg), 0);
if (!inode) {
fuse_queue_forget(fc, forget, outarg.nodeid, 1);
return -ENOMEM;
}
kfree(forget);
err = d_instantiate_no_diralias(entry, inode);
if (err)
return err;
fuse_change_entry_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
out_put_forget_req:
kfree(forget);
return err;
}
static int fuse_unlink(struct inode *dir, struct dentry *entry)
{
int err;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
FUSE_MIGHT_FREEZE(dir->i_sb, "fuse_unlink");
req = fuse_get_req(fc);
if (IS_ERR(req))
return PTR_ERR(req);
req->in.h.opcode = FUSE_UNLINK;
req->in.h.nodeid = get_node_id(dir);
req->in.numargs = 1;
req->in.args[0].size = entry->d_name.len + 1;
req->in.args[0].value = entry->d_name.name;
fuse_request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err) {
struct inode *inode = entry->d_inode;
/*
* Set nlink to zero so the inode can be cleared, if the inode
* does have more links this will be discovered at the next
* lookup/getattr.
*/
clear_nlink(inode);
fuse_invalidate_attr(inode);
fuse_invalidate_attr(dir);
fuse_invalidate_entry_cache(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
return err;
}
/*
* Code shared between mknod, mkdir, symlink and link
*/
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
struct inode *dir, struct dentry *entry,
int mode)
{
struct fuse_entry_out outarg;
struct inode *inode;
int err;
req->in.h.nodeid = get_node_id(dir);
req->inode = dir;
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
request_send(fc, req);
err = req->out.h.error;
if (err) {
fuse_put_request(fc, req);
return err;
}
err = -EIO;
if (invalid_nodeid(outarg.nodeid))
goto out_put_request;
if ((outarg.attr.mode ^ mode) & S_IFMT)
goto out_put_request;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
if (!inode) {
fuse_send_forget(fc, req, outarg.nodeid, 1);
return -ENOMEM;
}
fuse_put_request(fc, req);
if (dir_alias(inode)) {
iput(inode);
return -EIO;
}
d_instantiate(entry, inode);
fuse_change_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
out_put_request:
fuse_put_request(fc, req);
return err;
}
static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
{
int i;
fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */
for (i = 0; i < req->num_pages; i++) {
struct page *page = req->pages[i];
if (!req->out.h.error)
SetPageUptodate(page);
else
SetPageError(page);
unlock_page(page);
}
fuse_put_request(fc, req);
}
static int
fuse_internal_remove_callback(struct vnode *vp, void *cargs)
{
struct vattr *vap;
uint64_t target_nlink;
vap = VTOVA(vp);
target_nlink = *(uint64_t *)cargs;
/* somewhat lame "heuristics", but you got better ideas? */
if ((vap->va_nlink == target_nlink) && vnode_isreg(vp)) {
fuse_invalidate_attr(vp);
}
return 0;
}
/*
struct vnop_symlink_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
};
*/
static int
fuse_vnop_symlink(struct vop_symlink_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
char *target = ap->a_target;
struct fuse_dispatcher fdi;
int err;
size_t len;
FS_DEBUG2G("inode=%ju name=%*s\n",
(uintmax_t)VTOI(dvp), (int)cnp->cn_namelen, cnp->cn_nameptr);
if (fuse_isdeadfs(dvp)) {
return ENXIO;
}
/*
* Unlike the other creator type calls, here we have to create a message
* where the name of the new entry comes first, and the data describing
* the entry comes second.
* Hence we can't rely on our handy fuse_internal_newentry() routine,
* but put together the message manually and just call the core part.
*/
len = strlen(target) + 1;
fdisp_init(&fdi, len + cnp->cn_namelen + 1);
fdisp_make_vp(&fdi, FUSE_SYMLINK, dvp, curthread, NULL);
memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
((char *)fdi.indata)[cnp->cn_namelen] = '\0';
memcpy((char *)fdi.indata + cnp->cn_namelen + 1, target, len);
err = fuse_internal_newentry_core(dvp, vpp, cnp, VLNK, &fdi);
fdisp_destroy(&fdi);
if (err == 0) {
fuse_invalidate_attr(dvp);
}
return err;
}
static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
int err;
struct fuse_conn *fc = get_fuse_conn(dir);
FUSE_ARGS(args);
args.in.h.opcode = FUSE_RMDIR;
args.in.h.nodeid = get_node_id(dir);
args.in.numargs = 1;
args.in.args[0].size = entry->d_name.len + 1;
args.in.args[0].value = entry->d_name.name;
err = fuse_simple_request(fc, &args);
if (!err) {
clear_nlink(d_inode(entry));
fuse_invalidate_attr(dir);
fuse_invalidate_entry_cache(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
return err;
}
int
fuse_filehandle_put(vnode_t vp, vfs_context_t context, fufh_type_t fufh_type)
{
struct fuse_dispatcher fdi;
struct fuse_release_in *fri;
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct fuse_filehandle *fufh = NULL;
fuse_trace_printf("fuse_filehandle_put(vp=%p, fufh_type=%d)\n",
vp, fufh_type);
fufh = &(fvdat->fufh[fufh_type]);
if (FUFH_IS_VALID(fufh)) {
panic("fuse4x: filehandle_put called on a valid fufh (type=%d)",
fufh_type);
/* NOTREACHED */
}
if (fuse_isdeadfs(vp)) {
goto out;
}
int op = vnode_isdir(vp) ? FUSE_RELEASEDIR : FUSE_RELEASE;
fuse_dispatcher_init(&fdi, sizeof(*fri));
fuse_dispatcher_make_vp(&fdi, op, vp, context);
fri = fdi.indata;
fri->fh = fufh->fh_id;
fri->flags = fufh->open_flags;
int err = fuse_dispatcher_wait_answer(&fdi);
if (!err) {
fuse_ticket_drop(fdi.ticket);
}
out:
OSDecrementAtomic((SInt32 *)&fuse_fh_current);
fuse_invalidate_attr(vp);
return err;
}
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);
if (offset >= 0) {
pg_start = offset >> PAGE_CACHE_SHIFT;
if (len <= 0)
pg_end = -1;
else
pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
invalidate_inode_pages2_range(inode->i_mapping,
pg_start, pg_end);
}
int
fuse_notify_inval_inode(struct fuse_data *data, struct fuse_iov *iov) {
int err = 0;
struct fuse_notify_inval_inode_out fniio;
HNodeRef hp;
vnode_t vp;
fuse_abi_out(fuse_notify_inval_inode_out, DTOABI(data), iov->base, &fniio);
err = (int)HNodeLookupRealQuickIfExists(data->fdev, (ino_t)fniio.ino,
0 /* fork index */, &hp, &vp);
if (err) {
return err;
}
assert(vp != NULL);
fuse_nodelock_lock(VTOFUD(vp), FUSEFS_EXCLUSIVE_LOCK);
fuse_invalidate_attr(vp);
if (fniio.off >= 0) {
off_t end_off;
if (fniio.len > 0) {
end_off = (off_t) min(fniio.off + fniio.len, ubc_getsize(vp));
} else {
end_off = ubc_getsize(vp);
}
ubc_msync(vp, (off_t)fniio.off, end_off, NULL,
UBC_PUSHDIRTY | UBC_PUSHALL | UBC_INVALIDATE | UBC_SYNC);
}
FUSE_KNOTE(vp, NOTE_ATTRIB);
fuse_nodelock_unlock(VTOFUD(vp));
vnode_put(vp);
return err;
}
static int fuse_setxattr(struct dentry *entry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = entry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
struct fuse_setxattr_in inarg;
int err;
if (fc->no_setxattr)
return -EOPNOTSUPP;
req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
inarg.flags = flags;
req->in.h.opcode = FUSE_SETXATTR;
req->in.h.nodeid = get_node_id(inode);
req->in.numargs = 3;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
req->in.args[1].size = strlen(name) + 1;
req->in.args[1].value = name;
req->in.args[2].size = size;
req->in.args[2].value = value;
fuse_request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err == -ENOSYS) {
fc->no_setxattr = 1;
err = -EOPNOTSUPP;
}
if (!err)
fuse_invalidate_attr(inode);
return err;
}
static int fuse_commit_write(struct file *file, struct page *page,
unsigned offset, unsigned to)
{
int err;
size_t nres;
unsigned count = to - offset;
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
loff_t pos = page_offset(page) + offset;
struct fuse_req *req;
if (is_bad_inode(inode))
return -EIO;
req = fuse_get_request(fc);
if (!req)
return -EINTR;
req->num_pages = 1;
req->pages[0] = page;
req->page_offset = offset;
nres = fuse_send_write(req, file, inode, pos, count);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err && nres != count)
err = -EIO;
if (!err) {
pos += count;
if (pos > i_size_read(inode))
i_size_write(inode, pos);
if (offset == 0 && to == PAGE_CACHE_SIZE) {
clear_page_dirty(page);
SetPageUptodate(page);
}
}
fuse_invalidate_attr(inode);
return err;
}
int
fuse_internal_newentry(struct vnode *dvp,
struct vnode **vpp,
struct componentname *cnp,
enum fuse_opcode op,
void *buf,
size_t bufsize,
enum vtype vtype)
{
int err;
struct fuse_dispatcher fdi;
struct mount *mp = vnode_mount(dvp);
fdisp_init(&fdi, 0);
fuse_internal_newentry_makerequest(mp, VTOI(dvp), cnp, op, buf,
bufsize, &fdi);
err = fuse_internal_newentry_core(dvp, vpp, cnp, vtype, &fdi);
fdisp_destroy(&fdi);
fuse_invalidate_attr(dvp);
return err;
}
static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
{
int err;
size_t nbytes;
struct page *page;
struct inode *inode = file->f_path.dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
if (is_bad_inode(inode))
return -EIO;
req = fuse_get_req(fc);
if (IS_ERR(req))
return PTR_ERR(req);
page = alloc_page(GFP_KERNEL);
if (!page) {
fuse_put_request(fc, req);
return -ENOMEM;
}
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
fuse_request_send(fc, req);
nbytes = req->out.args[0].size;
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err)
err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
filldir);
__free_page(page);
fuse_invalidate_attr(inode); /* atime changed */
return err;
}
static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
int err;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
req->in.h.opcode = FUSE_RMDIR;
req->in.h.nodeid = get_node_id(dir);
req->in.numargs = 1;
req->in.args[0].size = entry->d_name.len + 1;
req->in.args[0].value = entry->d_name.name;
fuse_request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err) {
clear_nlink(entry->d_inode);
fuse_invalidate_attr(dir);
fuse_invalidate_entry_cache(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
return err;
}
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
struct qstr *name)
{
int err = -ENOTDIR;
struct inode *parent;
struct dentry *dir;
struct dentry *entry;
parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
if (!parent)
return -ENOENT;
mutex_lock(&parent->i_mutex);
if (!S_ISDIR(parent->i_mode))
goto unlock;
err = -ENOENT;
dir = d_find_alias(parent);
if (!dir)
goto unlock;
entry = d_lookup(dir, name);
dput(dir);
if (!entry)
goto unlock;
fuse_invalidate_attr(parent);
fuse_invalidate_entry(entry);
dput(entry);
err = 0;
unlock:
mutex_unlock(&parent->i_mutex);
iput(parent);
return err;
}
/*
struct vnop_rmdir_args {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} *ap;
*/
static int
fuse_vnop_rmdir(struct vop_rmdir_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
int err;
FS_DEBUG2G("inode=%ju\n", (uintmax_t)VTOI(vp));
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (VTOFUD(vp) == VTOFUD(dvp)) {
return EINVAL;
}
err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR);
if (err == 0) {
fuse_internal_vnode_disappear(vp);
fuse_invalidate_attr(dvp);
}
return err;
}
int
fuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
off_t oldsize;
int err = 0;
FS_DEBUG("inode=%ju oldsize=%ju newsize=%ju\n",
(uintmax_t)VTOI(vp), (uintmax_t)fvdat->filesize,
(uintmax_t)newsize);
ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize");
oldsize = fvdat->filesize;
fvdat->filesize = newsize;
fvdat->flag |= FN_SIZECHANGE;
if (newsize < oldsize) {
err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp));
}
vnode_pager_setsize(vp, newsize);
fuse_invalidate_attr(vp);
return err;
}
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
u64 child_nodeid, struct qstr *name)
{
int err = -ENOTDIR;
struct inode *parent;
struct dentry *dir;
struct dentry *entry;
parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
if (!parent)
return -ENOENT;
mutex_lock(&parent->i_mutex);
if (!S_ISDIR(parent->i_mode))
goto unlock;
err = -ENOENT;
dir = d_find_alias(parent);
if (!dir)
goto unlock;
entry = d_lookup(dir, name);
dput(dir);
if (!entry)
goto unlock;
fuse_invalidate_attr(parent);
fuse_invalidate_entry(entry);
if (child_nodeid != 0 && entry->d_inode) {
mutex_lock(&entry->d_inode->i_mutex);
if (get_node_id(entry->d_inode) != child_nodeid) {
err = -ENOENT;
goto badentry;
}
if (d_mountpoint(entry)) {
err = -EBUSY;
goto badentry;
}
if (S_ISDIR(entry->d_inode->i_mode)) {
shrink_dcache_parent(entry);
if (!simple_empty(entry)) {
err = -ENOTEMPTY;
goto badentry;
}
entry->d_inode->i_flags |= S_DEAD;
}
dont_mount(entry);
clear_nlink(entry->d_inode);
err = 0;
badentry:
mutex_unlock(&entry->d_inode->i_mutex);
if (!err)
d_delete(entry);
} else {
err = 0;
}
dput(entry);
unlock:
mutex_unlock(&parent->i_mutex);
iput(parent);
return err;
}
/*
* Code shared between mknod, mkdir, symlink and link
*/
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
struct inode *dir, struct dentry *entry,
umode_t mode)
{
struct fuse_entry_out outarg;
struct inode *inode;
int err;
struct fuse_forget_link *forget;
forget = fuse_alloc_forget();
if (!forget) {
fuse_put_request(fc, req);
return -ENOMEM;
}
memset(&outarg, 0, sizeof(outarg));
req->in.h.nodeid = get_node_id(dir);
req->out.numargs = 1;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
fuse_request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err)
goto out_put_forget_req;
err = -EIO;
if (invalid_nodeid(outarg.nodeid))
goto out_put_forget_req;
if ((outarg.attr.mode ^ mode) & S_IFMT)
goto out_put_forget_req;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr, entry_attr_timeout(&outarg), 0);
if (!inode) {
fuse_queue_forget(fc, forget, outarg.nodeid, 1);
return -ENOMEM;
}
kfree(forget);
if (S_ISDIR(inode->i_mode)) {
struct dentry *alias;
mutex_lock(&fc->inst_mutex);
alias = d_find_alias(inode);
if (alias) {
/* New directory must have moved since mkdir */
mutex_unlock(&fc->inst_mutex);
dput(alias);
iput(inode);
return -EBUSY;
}
d_instantiate(entry, inode);
mutex_unlock(&fc->inst_mutex);
} else
d_instantiate(entry, inode);
fuse_change_entry_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
out_put_forget_req:
kfree(forget);
return err;
}
/*
* Atomic create+open operation
*
* If the filesystem doesn't support this, then fall back to separate
* 'mknod' + 'open' requests.
*/
static int fuse_create_open(struct inode *dir, struct dentry *entry,
struct file *file, unsigned flags,
umode_t mode, int *opened)
{
int err;
struct inode *inode;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_forget_link *forget;
struct fuse_create_in inarg;
struct fuse_open_out outopen;
struct fuse_entry_out outentry;
struct fuse_file *ff;
/* Userspace expects S_IFREG in create mode */
BUG_ON((mode & S_IFMT) != S_IFREG);
forget = fuse_alloc_forget();
err = -ENOMEM;
if (!forget)
goto out_err;
req = fuse_get_req_nopages(fc);
err = PTR_ERR(req);
if (IS_ERR(req))
goto out_put_forget_req;
err = -ENOMEM;
ff = fuse_file_alloc(fc);
if (!ff)
goto out_put_request;
if (!fc->dont_mask)
mode &= ~current_umask();
flags &= ~O_NOCTTY;
memset(&inarg, 0, sizeof(inarg));
memset(&outentry, 0, sizeof(outentry));
inarg.flags = flags;
inarg.mode = mode;
inarg.umask = current_umask();
req->in.h.opcode = FUSE_CREATE;
req->in.h.nodeid = get_node_id(dir);
req->in.numargs = 2;
req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
sizeof(inarg);
req->in.args[0].value = &inarg;
req->in.args[1].size = entry->d_name.len + 1;
req->in.args[1].value = entry->d_name.name;
req->out.numargs = 2;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(outentry);
req->out.args[0].value = &outentry;
req->out.args[1].size = sizeof(outopen);
req->out.args[1].value = &outopen;
fuse_request_send(fc, req);
err = req->out.h.error;
if (err)
goto out_free_ff;
err = -EIO;
if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
goto out_free_ff;
fuse_put_request(fc, req);
ff->fh = outopen.fh;
ff->nodeid = outentry.nodeid;
ff->open_flags = outopen.open_flags;
inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
&outentry.attr, entry_attr_timeout(&outentry), 0);
if (!inode) {
flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
fuse_sync_release(ff, flags);
fuse_queue_forget(fc, forget, outentry.nodeid, 1);
err = -ENOMEM;
goto out_err;
}
kfree(forget);
d_instantiate(entry, inode);
fuse_change_entry_timeout(entry, &outentry);
fuse_invalidate_attr(dir);
err = finish_open(file, entry, generic_file_open, opened);
if (err) {
fuse_sync_release(ff, flags);
} else {
file->private_data = fuse_file_get(ff);
fuse_finish_open(inode, file);
}
return err;
out_free_ff:
fuse_file_free(ff);
out_put_request:
fuse_put_request(fc, req);
out_put_forget_req:
kfree(forget);
out_err:
return err;
}
/*
* Set attributes, and at the same time refresh them.
*
* Truncation is slightly complicated, because the 'truncate' request
* may fail, in which case we don't want to touch the mapping.
* vmtruncate() doesn't allow for this case, so do the rlimit checking
* and the actual truncation by hand.
*/
int fuse_do_setattr(struct inode *inode, struct iattr *attr,
struct file *file)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
struct fuse_setattr_in inarg;
struct fuse_attr_out outarg;
bool is_truncate = false;
loff_t oldsize;
int err;
if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
attr->ia_valid |= ATTR_FORCE;
err = inode_change_ok(inode, attr);
if (err)
return err;
if (attr->ia_valid & ATTR_OPEN) {
if (fc->atomic_o_trunc)
return 0;
file = NULL;
}
if (attr->ia_valid & ATTR_SIZE)
is_truncate = true;
req = fuse_get_req_nopages(fc);
if (IS_ERR(req))
return PTR_ERR(req);
if (is_truncate)
fuse_set_nowrite(inode);
memset(&inarg, 0, sizeof(inarg));
memset(&outarg, 0, sizeof(outarg));
iattr_to_fattr(attr, &inarg);
if (file) {
struct fuse_file *ff = file->private_data;
inarg.valid |= FATTR_FH;
inarg.fh = ff->fh;
}
if (attr->ia_valid & ATTR_SIZE) {
/* For mandatory locking in truncate */
inarg.valid |= FATTR_LOCKOWNER;
inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
}
req->in.h.opcode = FUSE_SETATTR;
req->in.h.nodeid = get_node_id(inode);
req->in.numargs = 1;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
req->out.numargs = 1;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
else
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
fuse_request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err) {
if (err == -EINTR)
fuse_invalidate_attr(inode);
goto error;
}
if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
make_bad_inode(inode);
err = -EIO;
goto error;
}
spin_lock(&fc->lock);
fuse_change_attributes_common(inode, &outarg.attr,
attr_timeout(&outarg));
oldsize = inode->i_size;
i_size_write(inode, outarg.attr.size);
if (is_truncate) {
/* NOTE: this may release/reacquire fc->lock */
__fuse_release_nowrite(inode);
}
spin_unlock(&fc->lock);
/*
* Only call invalidate_inode_pages2() after removing
* FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
*/
if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
truncate_pagecache(inode, oldsize, outarg.attr.size);
invalidate_inode_pages2(inode->i_mapping);
}
return 0;
error:
if (is_truncate)
fuse_release_nowrite(inode);
return err;
}
/*
* Atomic create+open operation
*
* If the filesystem doesn't support this, then fall back to separate
* 'mknod' + 'open' requests.
*/
static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
struct nameidata *nd)
{
int err;
struct inode *inode;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_req *forget_req;
struct fuse_create_in inarg;
struct fuse_open_out outopen;
struct fuse_entry_out outentry;
struct fuse_file *ff;
struct file *file;
int flags = nd->intent.open.flags - 1;
if (fc->no_create)
return -ENOSYS;
if (flags & O_DIRECT)
return -EINVAL;
forget_req = fuse_get_req(fc);
if (IS_ERR(forget_req))
return PTR_ERR(forget_req);
req = fuse_get_req(fc);
err = PTR_ERR(req);
if (IS_ERR(req))
goto out_put_forget_req;
err = -ENOMEM;
ff = fuse_file_alloc(fc);
if (!ff)
goto out_put_request;
if (!fc->dont_mask)
mode &= ~current_umask();
flags &= ~O_NOCTTY;
memset(&inarg, 0, sizeof(inarg));
memset(&outentry, 0, sizeof(outentry));
inarg.flags = flags;
inarg.mode = mode;
inarg.umask = current_umask();
req->in.h.opcode = FUSE_CREATE;
req->in.h.nodeid = get_node_id(dir);
req->in.numargs = 2;
req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
sizeof(inarg);
req->in.args[0].value = &inarg;
req->in.args[1].size = entry->d_name.len + 1;
req->in.args[1].value = entry->d_name.name;
req->out.numargs = 2;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
else
req->out.args[0].size = sizeof(outentry);
req->out.args[0].value = &outentry;
req->out.args[1].size = sizeof(outopen);
req->out.args[1].value = &outopen;
fuse_request_send(fc, req);
err = req->out.h.error;
if (err) {
if (err == -ENOSYS)
fc->no_create = 1;
goto out_free_ff;
}
err = -EIO;
if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
goto out_free_ff;
fuse_put_request(fc, req);
ff->fh = outopen.fh;
ff->nodeid = outentry.nodeid;
ff->open_flags = outopen.open_flags;
inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
&outentry.attr, entry_attr_timeout(&outentry), 0);
if (!inode) {
flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
fuse_sync_release(ff, flags);
fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
return -ENOMEM;
}
fuse_put_request(fc, forget_req);
d_instantiate(entry, inode);
fuse_change_entry_timeout(entry, &outentry);
fuse_invalidate_attr(dir);
file = lookup_instantiate_filp(nd, entry, generic_file_open);
if (IS_ERR(file)) {
fuse_sync_release(ff, flags);
return PTR_ERR(file);
}
file->private_data = fuse_file_get(ff);
fuse_finish_open(inode, file);
return 0;
out_free_ff:
fuse_file_free(ff);
out_put_request:
fuse_put_request(fc, req);
out_put_forget_req:
fuse_put_request(fc, forget_req);
return err;
}
/*
* Code shared between mknod, mkdir, symlink and link
*/
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
struct _inode *dir, struct dentry *entry,
int mode)
{
struct fuse_entry_out outarg;
struct inode *inode;
struct _inode *_inode;
int err;
struct fuse_req *forget_req;
forget_req = fuse_get_req(fc);
if (IS_ERR(forget_req)) {
fuse_put_request(fc, req);
return PTR_ERR(forget_req);
}
req->in.h.nodeid = _get_node_id(dir);
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err)
goto out_put_forget_req;
err = -EIO;
if (invalid_nodeid(outarg.nodeid))
goto out_put_forget_req;
if ((outarg.attr.mode ^ mode) & S_IFMT)
goto out_put_forget_req;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
if (!inode) {
fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
return -ENOMEM;
}
fuse_put_request(fc, forget_req);
_inode = tx_cache_get_inode(inode);
if (S_ISDIR(_inode->i_mode)) {
struct dentry *alias;
mutex_lock(&fc->inst_mutex);
alias = d_find_alias(_inode);
if (alias) {
/* New directory must have moved since mkdir */
mutex_unlock(&fc->inst_mutex);
dput(alias);
iput(inode);
return -EBUSY;
}
d_instantiate(entry, _inode);
mutex_unlock(&fc->inst_mutex);
} else
d_instantiate(entry, _inode);
fuse_change_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
out_put_forget_req:
fuse_put_request(fc, forget_req);
return err;
}
/**
* Mark the attributes as stale due to an atime change. Avoid the invalidate if
* atime is not used.
*/
void fuse_invalidate_atime(struct inode *inode)
{
if (!IS_RDONLY(inode))
fuse_invalidate_attr(inode);
}
/*
* Set attributes, and at the same time refresh them.
*
* Truncation is slightly complicated, because the 'truncate' request
* may fail, in which case we don't want to touch the mapping.
* vmtruncate() doesn't allow for this case, so do the rlimit checking
* and the actual truncation by hand.
*/
int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
struct file *file)
{
struct inode *inode = d_inode(dentry);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
FUSE_ARGS(args);
struct fuse_setattr_in inarg;
struct fuse_attr_out outarg;
bool is_truncate = false;
bool is_wb = fc->writeback_cache;
loff_t oldsize;
int err;
bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);
if (!fc->default_permissions)
attr->ia_valid |= ATTR_FORCE;
err = setattr_prepare(dentry, attr);
if (err)
return err;
if (attr->ia_valid & ATTR_OPEN) {
if (fc->atomic_o_trunc)
return 0;
file = NULL;
}
if (attr->ia_valid & ATTR_SIZE)
is_truncate = true;
if (is_truncate) {
fuse_set_nowrite(inode);
set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
if (trust_local_cmtime && attr->ia_size != inode->i_size)
attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
}
memset(&inarg, 0, sizeof(inarg));
memset(&outarg, 0, sizeof(outarg));
iattr_to_fattr(attr, &inarg, trust_local_cmtime);
if (file) {
struct fuse_file *ff = file->private_data;
inarg.valid |= FATTR_FH;
inarg.fh = ff->fh;
}
if (attr->ia_valid & ATTR_SIZE) {
/* For mandatory locking in truncate */
inarg.valid |= FATTR_LOCKOWNER;
inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
}
fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
err = fuse_simple_request(fc, &args);
if (err) {
if (err == -EINTR)
fuse_invalidate_attr(inode);
goto error;
}
if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
make_bad_inode(inode);
err = -EIO;
goto error;
}
spin_lock(&fc->lock);
/* the kernel maintains i_mtime locally */
if (trust_local_cmtime) {
if (attr->ia_valid & ATTR_MTIME)
inode->i_mtime = attr->ia_mtime;
if (attr->ia_valid & ATTR_CTIME)
inode->i_ctime = attr->ia_ctime;
/* FIXME: clear I_DIRTY_SYNC? */
}
fuse_change_attributes_common(inode, &outarg.attr,
attr_timeout(&outarg));
oldsize = inode->i_size;
/* see the comment in fuse_change_attributes() */
if (!is_wb || is_truncate || !S_ISREG(inode->i_mode))
i_size_write(inode, outarg.attr.size);
if (is_truncate) {
/* NOTE: this may release/reacquire fc->lock */
__fuse_release_nowrite(inode);
}
spin_unlock(&fc->lock);
/*
* Only call invalidate_inode_pages2() after removing
* FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
*/
if ((is_truncate || !is_wb) &&
S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
truncate_pagecache(inode, outarg.attr.size);
invalidate_inode_pages2(inode->i_mapping);
}
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
return 0;
error:
if (is_truncate)
fuse_release_nowrite(inode);
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
return err;
}
static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
struct file *file)
{
struct inode *inode = entry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_req *req;
struct fuse_setattr_in inarg;
struct fuse_attr_out outarg;
bool is_truncate = false;
loff_t oldsize;
int err;
if (!fuse_allow_task(fc, current))
return -EACCES;
if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
attr->ia_valid |= ATTR_FORCE;
err = inode_change_ok(inode, attr);
if (err)
return err;
if (attr->ia_valid & ATTR_OPEN) {
if (fc->atomic_o_trunc)
return 0;
file = NULL;
}
if (attr->ia_valid & ATTR_SIZE)
is_truncate = true;
req = fuse_get_req(fc);
if (IS_ERR(req))
return PTR_ERR(req);
if (is_truncate) {
fuse_set_nowrite(inode);
set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
}
memset(&inarg, 0, sizeof(inarg));
memset(&outarg, 0, sizeof(outarg));
iattr_to_fattr(attr, &inarg);
if (file) {
struct fuse_file *ff = file->private_data;
inarg.valid |= FATTR_FH;
inarg.fh = ff->fh;
}
if (attr->ia_valid & ATTR_SIZE) {
inarg.valid |= FATTR_LOCKOWNER;
inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
}
req->in.h.opcode = FUSE_SETATTR;
req->in.h.nodeid = get_node_id(inode);
req->in.numargs = 1;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
req->out.numargs = 1;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
else
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
fuse_request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if (err) {
if (err == -EINTR)
fuse_invalidate_attr(inode);
goto error;
}
if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
make_bad_inode(inode);
err = -EIO;
goto error;
}
spin_lock(&fc->lock);
fuse_change_attributes_common(inode, &outarg.attr,
attr_timeout(&outarg));
oldsize = inode->i_size;
i_size_write(inode, outarg.attr.size);
if (is_truncate) {
__fuse_release_nowrite(inode);
}
spin_unlock(&fc->lock);
if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
truncate_pagecache(inode, oldsize, outarg.attr.size);
invalidate_inode_pages2(inode->i_mapping);
}
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
return 0;
error:
if (is_truncate)
fuse_release_nowrite(inode);
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
return err;
}
