STATIC int
linvfs_symlink(
struct inode *dir,
struct dentry *dentry,
const char *symname)
{
struct inode *ip;
vattr_t va;
vnode_t *dvp; /* directory containing name of symlink */
vnode_t *cvp; /* used to lookup symlink to put in dentry */
int error;
dvp = LINVFS_GET_VP(dir);
cvp = NULL;
memset(&va, 0, sizeof(va));
va.va_type = VLNK;
va.va_mode = irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO;
va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
error = 0;
VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
if (!error && cvp) {
ASSERT(cvp->v_type == VLNK);
ip = LINVFS_GET_IP(cvp);
d_instantiate(dentry, ip);
validate_fields(dir);
validate_fields(ip); /* size needs update */
}
return -error;
}
STATIC int
linvfs_symlink(
struct inode *dir,
struct dentry *dentry,
const char *symname)
{
struct inode *ip;
vattr_t va;
vnode_t *dvp; /* directory containing name of symlink */
vnode_t *cvp; /* used to lookup symlink to put in dentry */
int error;
dvp = LINVFS_GET_VP(dir);
cvp = NULL;
memset(&va, 0, sizeof(va));
va.va_mode = S_IFLNK |
(irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
error = 0;
VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
if (likely(!error && cvp)) {
error = linvfs_init_security(cvp, dir);
if (likely(!error)) {
ip = LINVFS_GET_IP(cvp);
d_instantiate(dentry, ip);
validate_fields(dir);
validate_fields(ip);
}
}
return -error;
}
static int
unionfs_symlink(void *v)
{
struct vop_symlink_args *ap = v;
int error;
struct unionfs_node *dunp;
struct componentname *cnp;
struct vnode *udvp;
struct vnode *uvp;
UNIONFS_INTERNAL_DEBUG("unionfs_symlink: enter\n");
error = EROFS;
dunp = VTOUNIONFS(ap->a_dvp);
cnp = ap->a_cnp;
udvp = dunp->un_uppervp;
if (udvp != NULLVP) {
error = VOP_SYMLINK(udvp, &uvp, cnp, ap->a_vap, ap->a_target);
if (error == 0) {
error = unionfs_nodeget(ap->a_dvp->v_mount, uvp, NULLVP,
ap->a_dvp, ap->a_vpp, cnp);
if (error) {
vput(uvp);
} else {
vrele(uvp);
}
}
}
UNIONFS_INTERNAL_DEBUG("unionfs_symlink: leave (%d)\n", error);
return (error);
}
int
RUMP_VOP_SYMLINK(struct vnode *dvp,
struct vnode **vpp,
struct componentname *cnp,
struct vattr *vap,
char *target)
{
int error;
rump_schedule();
error = VOP_SYMLINK(dvp, vpp, cnp, vap, target);
rump_unschedule();
return error;
}
/*
* union_symlink:
*
* dvp is locked on entry and remains locked on return. a_vpp is garbage
* (unused).
*
* union_symlink(struct vnode *a_dvp, struct vnode **a_vpp,
* struct componentname *a_cnp, struct vattr *a_vap,
* char *a_target)
*/
static int
union_symlink(struct vop_old_symlink_args *ap)
{
struct union_node *dun = VTOUNION(ap->a_dvp);
struct componentname *cnp = ap->a_cnp;
struct thread *td = cnp->cn_td;
struct vnode *dvp;
int error = EROFS;
if ((dvp = union_lock_upper(dun, td)) != NULLVP) {
error = VOP_SYMLINK(dvp, ap->a_vpp, cnp, ap->a_vap,
ap->a_target);
union_unlock_upper(dvp, td);
}
return (error);
}
/*
* Does most of the work for symlink().
*
* Note, however, if you're implementing symlinks, that various
* other parts of the VFS layer are missing crucial elements of
* support for symlinks.
*/
int
vfs_symlink(const char *contents, char *path)
{
struct vnode *newdir;
char newname[NAME_MAX+1];
int result;
result = vfs_lookparent(path, &newdir, newname, sizeof(newname));
if (result) {
return result;
}
result = VOP_SYMLINK(newdir, newname, contents);
VOP_DECREF(newdir);
return result;
}
STATIC int
linvfs_symlink(
struct inode *dir,
struct dentry *dentry,
const char *symname)
{
int error;
vnode_t *dvp; /* directory containing name to remove */
vnode_t *cvp; /* used to lookup symlink to put in dentry */
vattr_t va;
struct inode *ip = NULL;
dvp = LINVFS_GET_VP(dir);
bzero(&va, sizeof(va));
va.va_type = VLNK;
va.va_mode = irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO;
va.va_mask = AT_TYPE|AT_MODE;
error = 0;
VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
if (!error) {
ASSERT(cvp);
ASSERT(cvp->v_type == VLNK);
ip = LINVFS_GET_IP(cvp);
if (!ip) {
error = ENOMEM;
VN_RELE(cvp);
} else {
/* linvfs_revalidate_core returns (-) errors */
error = -linvfs_revalidate_core(ip, ATTR_COMM);
d_instantiate(dentry, ip);
validate_fields(dir);
validate_fields(ip); /* size needs update */
mark_inode_dirty_sync(ip);
mark_inode_dirty_sync(dir);
}
}
return -error;
}
static int
auto_symlink(
vnode_t *dvp,
char *lnknm, /* new entry */
vattr_t *tva,
char *tnm, /* existing entry */
cred_t *cred,
caller_context_t *ct,
int flags)
{
vnode_t *newvp;
int error;
AUTOFS_DPRINT((4, "auto_symlink: dvp=%p lnknm=%s tnm=%s\n",
(void *)dvp, lnknm, tnm));
if (error = auto_trigger_mount(dvp, cred, &newvp))
goto done;
if (newvp != NULL) {
/*
* Node is mounted on.
*/
if (vn_is_readonly(newvp))
error = EROFS;
else
error = VOP_SYMLINK(newvp, lnknm, tva, tnm, cred,
ct, flags);
VN_RELE(newvp);
} else
error = ENOSYS;
done:
AUTOFS_DPRINT((5, "auto_symlink: error=%d\n", error));
return (error);
}
static int
zfs_replay_create(zfsvfs_t *zfsvfs, lr_create_t *lr, boolean_t byteswap)
{
char *name = NULL; /* location determined later */
char *link; /* symlink content follows name */
znode_t *dzp;
vnode_t *vp = NULL;
xvattr_t xva;
int vflg = 0;
size_t lrsize = sizeof (lr_create_t);
lr_attr_t *lrattr;
void *start;
size_t xvatlen;
uint64_t txtype;
struct componentname cn;
int error;
txtype = (lr->lr_common.lrc_txtype & ~TX_CI);
if (byteswap) {
byteswap_uint64_array(lr, sizeof (*lr));
if (txtype == TX_CREATE_ATTR || txtype == TX_MKDIR_ATTR)
zfs_replay_swap_attrs((lr_attr_t *)(lr + 1));
}
if ((error = zfs_zget(zfsvfs, lr->lr_doid, &dzp)) != 0)
return (error);
xva_init(&xva);
zfs_init_vattr(&xva.xva_vattr, AT_TYPE | AT_MODE | AT_UID | AT_GID,
lr->lr_mode, lr->lr_uid, lr->lr_gid, lr->lr_rdev, lr->lr_foid);
/*
* All forms of zfs create (create, mkdir, mkxattrdir, symlink)
* eventually end up in zfs_mknode(), which assigns the object's
* creation time and generation number. The generic VOP_CREATE()
* doesn't have either concept, so we smuggle the values inside
* the vattr's otherwise unused va_ctime and va_nblocks fields.
*/
ZFS_TIME_DECODE(&xva.xva_vattr.va_ctime, lr->lr_crtime);
xva.xva_vattr.va_nblocks = lr->lr_gen;
error = dmu_object_info(zfsvfs->z_os, lr->lr_foid, NULL);
if (error != ENOENT)
goto out;
if (lr->lr_common.lrc_txtype & TX_CI)
vflg |= FIGNORECASE;
/*
* Symlinks don't have fuid info, and CIFS never creates
* symlinks.
*
* The _ATTR versions will grab the fuid info in their subcases.
*/
if ((int)lr->lr_common.lrc_txtype != TX_SYMLINK &&
(int)lr->lr_common.lrc_txtype != TX_MKDIR_ATTR &&
(int)lr->lr_common.lrc_txtype != TX_CREATE_ATTR) {
start = (lr + 1);
zfsvfs->z_fuid_replay =
zfs_replay_fuid_domain(start, &start,
lr->lr_uid, lr->lr_gid);
}
cn.cn_cred = kcred;
cn.cn_thread = curthread;
cn.cn_flags = SAVENAME;
vn_lock(ZTOV(dzp), LK_EXCLUSIVE | LK_RETRY);
switch (txtype) {
case TX_CREATE_ATTR:
lrattr = (lr_attr_t *)(caddr_t)(lr + 1);
xvatlen = ZIL_XVAT_SIZE(lrattr->lr_attr_masksize);
zfs_replay_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), &xva);
start = (caddr_t)(lr + 1) + xvatlen;
zfsvfs->z_fuid_replay =
zfs_replay_fuid_domain(start, &start,
lr->lr_uid, lr->lr_gid);
name = (char *)start;
/*FALLTHROUGH*/
case TX_CREATE:
if (name == NULL)
name = (char *)start;
cn.cn_nameptr = name;
error = VOP_CREATE(ZTOV(dzp), &vp, &cn, &xva.xva_vattr /*,vflg*/);
break;
case TX_MKDIR_ATTR:
lrattr = (lr_attr_t *)(caddr_t)(lr + 1);
xvatlen = ZIL_XVAT_SIZE(lrattr->lr_attr_masksize);
zfs_replay_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), &xva);
start = (caddr_t)(lr + 1) + xvatlen;
zfsvfs->z_fuid_replay =
zfs_replay_fuid_domain(start, &start,
lr->lr_uid, lr->lr_gid);
name = (char *)start;
/*FALLTHROUGH*/
case TX_MKDIR:
if (name == NULL)
name = (char *)(lr + 1);
cn.cn_nameptr = name;
error = VOP_MKDIR(ZTOV(dzp), &vp, &cn, &xva.xva_vattr /*,vflg*/);
break;
case TX_MKXATTR:
error = zfs_make_xattrdir(dzp, &xva.xva_vattr, &vp, kcred);
break;
case TX_SYMLINK:
name = (char *)(lr + 1);
link = name + strlen(name) + 1;
cn.cn_nameptr = name;
error = VOP_SYMLINK(ZTOV(dzp), &vp, &cn, &xva.xva_vattr, link /*,vflg*/);
break;
default:
error = ENOTSUP;
}
VOP_UNLOCK(ZTOV(dzp), 0);
out:
if (error == 0 && vp != NULL)
VN_URELE(vp);
VN_RELE(ZTOV(dzp));
if (zfsvfs->z_fuid_replay)
zfs_fuid_info_free(zfsvfs->z_fuid_replay);
zfsvfs->z_fuid_replay = NULL;
return (error);
}
static int zfsfuse_symlink(fuse_req_t req, const char *link, fuse_ino_t parent, const char *name)
{
if(strlen(name) >= MAXNAMELEN)
return ENAMETOOLONG;
vfs_t *vfs = (vfs_t *) fuse_req_userdata(req);
zfsvfs_t *zfsvfs = vfs->vfs_data;
ZFS_ENTER(zfsvfs);
znode_t *znode;
int error = zfs_zget(zfsvfs, parent, &znode, B_FALSE);
if(error) {
ZFS_EXIT(zfsvfs);
/* If the inode we are trying to get was recently deleted
dnode_hold_impl will return EEXIST instead of ENOENT */
return error == EEXIST ? ENOENT : error;
}
ASSERT(znode != NULL);
vnode_t *dvp = ZTOV(znode);
ASSERT(dvp != NULL);
cred_t cred;
zfsfuse_getcred(req, &cred);
vattr_t vattr;
vattr.va_type = VLNK;
vattr.va_mode = 0777;
vattr.va_mask = AT_TYPE | AT_MODE;
error = VOP_SYMLINK(dvp, (char *) name, &vattr, (char *) link, &cred, NULL, 0);
vnode_t *vp = NULL;
if(error)
goto out;
error = VOP_LOOKUP(dvp, (char *) name, &vp, NULL, 0, NULL, &cred, NULL, NULL, NULL);
if(error)
goto out;
ASSERT(vp != NULL);
struct fuse_entry_param e = { 0 };
e.attr_timeout = 0.0;
e.entry_timeout = 0.0;
e.ino = VTOZ(vp)->z_id;
if(e.ino == 3)
e.ino = 1;
e.generation = VTOZ(vp)->z_phys->zp_gen;
error = zfsfuse_stat(vp, &e.attr, &cred);
out:
if(vp != NULL)
VN_RELE(vp);
VN_RELE(dvp);
ZFS_EXIT(zfsvfs);
if(!error)
fuse_reply_entry(req, &e);
return error;
}
/*
* Creates the fs cache directory.
* The directory name is the ascii version of the fsid.
* Also makes a symlink to the directory using the specified name.
*/
int
fscdir_create(cachefscache_t *cachep, char *namep, fscache_t *fscp)
{
int error;
vnode_t *fscdirvp = NULL;
vnode_t *infovp = NULL;
vnode_t *attrvp = NULL;
struct vattr *attrp = (struct vattr *)NULL;
char name[CFS_FRONTFILE_NAME_SIZE];
int files;
int blocks = 0;
cfs_cid_t cid;
ino64_t fsid;
ASSERT(MUTEX_HELD(&cachep->c_fslistlock));
ASSERT(fscp->fs_infovp == NULL);
ASSERT(fscp->fs_fscdirvp == NULL);
ASSERT(fscp->fs_fsattrdir == NULL);
/* directory, symlink and options file + attrcache dir */
files = 0;
while (files < 4) {
error = cachefs_allocfile(cachep);
if (error)
goto out;
files++;
}
error = cachefs_allocblocks(cachep, 4, CACHEFS_RL_NONE);
if (error)
goto out;
blocks = 4;
attrp = cachefs_kmem_alloc(sizeof (struct vattr), KM_SLEEP);
attrp->va_mode = S_IFDIR | 0777;
attrp->va_uid = 0;
attrp->va_gid = 0;
attrp->va_type = VDIR;
attrp->va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID;
error = VOP_MKDIR(cachep->c_dirvp, namep, attrp, &fscdirvp, kcred,
NULL, 0, NULL);
if (error) {
cmn_err(CE_WARN, "Can't create fs cache directory");
goto out;
}
/*
* Created the directory. Get the fileno. That'll be the cachefs_fsid.
*/
attrp->va_mask = AT_NODEID;
error = VOP_GETATTR(fscdirvp, attrp, 0, kcred, NULL);
if (error) {
goto out;
}
fsid = attrp->va_nodeid;
attrp->va_mode = S_IFREG | 0666;
attrp->va_uid = 0;
attrp->va_gid = 0;
attrp->va_type = VREG;
attrp->va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID;
error = VOP_CREATE(fscdirvp, CACHEFS_FSINFO, attrp, EXCL,
0600, &infovp, kcred, 0, NULL, NULL);
if (error) {
cmn_err(CE_WARN, "Can't create fs option file");
goto out;
}
attrp->va_size = MAXBSIZE;
attrp->va_mask = AT_SIZE;
error = VOP_SETATTR(infovp, attrp, 0, kcred, NULL);
if (error) {
cmn_err(CE_WARN, "Can't set size of fsinfo file");
goto out;
}
/* write out the info file */
fscp->fs_flags |= CFS_FS_DIRTYINFO;
error = fscache_info_sync(fscp);
if (error)
goto out;
/*
* Install the symlink from cachefs_fsid -> directory.
*/
cid.cid_flags = 0;
cid.cid_fileno = fsid;
make_ascii_name(&cid, name);
error = VOP_RENAME(cachep->c_dirvp, namep, cachep->c_dirvp,
name, kcred, NULL, 0);
if (error) {
cmn_err(CE_WARN, "Can't rename cache directory");
goto out;
}
attrp->va_mask = AT_MODE | AT_TYPE;
attrp->va_mode = 0777;
attrp->va_type = VLNK;
error = VOP_SYMLINK(cachep->c_dirvp, namep, attrp, name, kcred, NULL,
0);
if (error) {
cmn_err(CE_WARN, "Can't create cache directory symlink");
goto out;
}
/*
* Finally, make the attrcache directory
*/
attrp->va_mode = S_IFDIR | 0777;
attrp->va_uid = 0;
attrp->va_gid = 0;
attrp->va_type = VDIR;
attrp->va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID;
error = VOP_MKDIR(fscdirvp, ATTRCACHE_NAME, attrp, &attrvp, kcred, NULL,
0, NULL);
if (error) {
cmn_err(CE_WARN, "Can't create attrcache dir for fscache");
goto out;
}
mutex_enter(&fscp->fs_fslock);
fscp->fs_cfsid = fsid;
fscp->fs_fscdirvp = fscdirvp;
fscp->fs_fsattrdir = attrvp;
fscp->fs_infovp = infovp;
mutex_exit(&fscp->fs_fslock);
out:
if (error) {
while (files-- > 0)
cachefs_freefile(cachep);
if (fscdirvp)
VN_RELE(fscdirvp);
if (blocks)
cachefs_freeblocks(cachep, blocks, CACHEFS_RL_NONE);
if (attrvp)
VN_RELE(attrvp);
if (infovp)
VN_RELE(infovp);
}
if (attrp)
cachefs_kmem_free(attrp, sizeof (struct vattr));
return (error);
}