int vfs_get_root_handle(struct vfs_filesystem *vfs_fs,
struct vfs_fsal_export *exp)
{
enum fsid_type fsid_type;
struct fsal_fsid__ fsid;
int fd;
int retval;
void *data;
size_t sz;
vfs_file_handle_t *fh;
vfs_alloc_handle(fh);
if (path_to_fshandle(vfs_fs->fs->path, &data, &sz) < 0) {
retval = errno;
LogMajor(COMPONENT_FSAL,
"Export root %s could not be established for XFS error %s",
vfs_fs->fs->path, strerror(retval));
return retval;
}
fd = open(vfs_fs->fs->path, O_RDONLY | O_DIRECTORY);
if (fd < 0) {
retval = errno;
LogMajor(COMPONENT_FSAL,
"Could not open XFS mount point %s: rc = %s (%d)",
vfs_fs->fs->path, strerror(retval), retval);
return retval;
}
retval = vfs_fd_to_handle(fd, vfs_fs->fs, fh);
if (retval != 0) {
retval = errno;
LogMajor(COMPONENT_FSAL,
"Get root handle for %s failed with %s (%d)",
vfs_fs->fs->path, strerror(retval), retval);
goto errout;
}
(void) vfs_extract_fsid(fh, &fsid_type, &fsid);
retval = re_index_fs_fsid(vfs_fs->fs, fsid_type,
fsid.major, fsid.minor);
if (retval < 0) {
LogCrit(COMPONENT_FSAL,
"Could not re-index XFS file system fsid for %s",
vfs_fs->fs->path);
retval = -retval;
}
errout:
close(fd);
return retval;
}
static struct closefd vfs_fsal_open_and_stat(struct fsal_export *exp,
struct vfs_fsal_obj_handle *myself,
struct stat *stat, int open_flags,
fsal_errors_t *fsal_error)
{
struct fsal_obj_handle *obj_hdl = &myself->obj_handle;
struct closefd cfd = { .fd = -1, .close_fd = false };
int retval = 0;
vfs_file_handle_t *fh = NULL;
vfs_alloc_handle(fh);
const char *func = "unknown";
struct vfs_filesystem *vfs_fs = myself->obj_handle.fs->private;
switch (obj_hdl->type) {
case SOCKET_FILE:
case CHARACTER_FILE:
case BLOCK_FILE:
cfd.fd = vfs_open_by_handle(vfs_fs,
myself->u.unopenable.dir,
O_PATH | O_NOACCESS,
fsal_error);
if (cfd.fd < 0) {
LogDebug(COMPONENT_FSAL,
"Failed with %s open_flags 0x%08x",
strerror(-cfd.fd), O_PATH | O_NOACCESS);
return cfd;
}
cfd.close_fd = true;
retval =
fstatat(cfd.fd, myself->u.unopenable.name, stat,
AT_SYMLINK_NOFOLLOW);
func = "fstatat";
break;
case REGULAR_FILE:
if (myself->u.file.openflags == FSAL_O_CLOSED) {
/* no file open at the moment */
cfd.fd = vfs_fsal_open(myself, open_flags, fsal_error);
if (cfd.fd < 0) {
LogDebug(COMPONENT_FSAL,
"Failed with %s open_flags 0x%08x",
strerror(-cfd.fd), open_flags);
return cfd;
}
cfd.close_fd = true;
} else {
cfd.fd = myself->u.file.fd;
}
retval = fstat(cfd.fd, stat);
func = "fstat";
break;
case SYMBOLIC_LINK:
open_flags |= (O_PATH | O_RDWR | O_NOFOLLOW);
goto vfos_open;
case FIFO_FILE:
open_flags |= O_NONBLOCK;
/* fall through */
case DIRECTORY:
default:
vfos_open:
cfd.fd = vfs_fsal_open(myself, open_flags, fsal_error);
if (cfd.fd < 0) {
LogDebug(COMPONENT_FSAL,
"Failed with %s open_flags 0x%08x",
strerror(-cfd.fd), open_flags);
return cfd;
}
cfd.close_fd = true;
retval = vfs_stat_by_handle(cfd.fd, myself->handle,
stat, open_flags);
func = "vfs_stat_by_handle";
break;
}
if (retval < 0) {
retval = errno;
if (cfd.close_fd) {
int rc;
rc = close(cfd.fd);
if (rc < 0) {
rc = errno;
LogDebug(COMPONENT_FSAL, "close failed with %s",
strerror(rc));
}
}
if (retval == ENOENT)
retval = ESTALE;
*fsal_error = posix2fsal_error(retval);
LogDebug(COMPONENT_FSAL, "%s failed with %s", func,
strerror(retval));
cfd.fd = -retval;
cfd.close_fd = false;
return cfd;
}
return cfd;
}
static fsal_status_t getattrs(struct fsal_obj_handle *obj_hdl)
{
struct vfs_fsal_obj_handle *myself;
struct closefd cfd = { .fd = -1, .close_fd = false };
struct stat stat;
fsal_errors_t fsal_error = ERR_FSAL_NO_ERROR;
fsal_status_t st;
int retval = 0;
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
if (obj_hdl->fsal != obj_hdl->fs->fsal) {
LogDebug(COMPONENT_FSAL,
"FSAL %s getattr for handle belonging to FSAL %s, ignoring",
obj_hdl->fsal->name,
obj_hdl->fs->fsal != NULL
? obj_hdl->fs->fsal->name
: "(none)");
goto out;
}
cfd = vfs_fsal_open_and_stat(op_ctx->fsal_export, myself, &stat,
O_RDONLY, &fsal_error);
if (cfd.fd >= 0) {
st = posix2fsal_attributes(&stat, &obj_hdl->attributes);
if (cfd.close_fd)
close(cfd.fd);
if (FSAL_IS_ERROR(st)) {
FSAL_CLEAR_MASK(obj_hdl->attributes.mask);
FSAL_SET_MASK(obj_hdl->attributes.mask,
ATTR_RDATTR_ERR);
fsal_error = st.major;
retval = st.minor;
} else {
obj_hdl->attributes.fsid = obj_hdl->fs->fsid;
}
} else {
LogDebug(COMPONENT_FSAL, "Failed with %s, fsal_error %s",
strerror(-cfd.fd),
fsal_error ==
ERR_FSAL_STALE ? "ERR_FSAL_STALE" : "other");
if (obj_hdl->type == SYMBOLIC_LINK
&& cfd.fd == -EPERM) {
/* You cannot open_by_handle (XFS on linux) a symlink
* and it throws an EPERM error for it.
* open_by_handle_at does not throw that error for
* symlinks so we play a game here. Since there is
* not much we can do with symlinks anyway,
* say that we did it but don't actually
* do anything. In this case, return the stat we got
* at lookup time. If you *really* want to tweek things
* like owners, get a modern linux kernel...
*/
fsal_error = ERR_FSAL_NO_ERROR;
goto out;
}
retval = -cfd.fd;
}
out:
return fsalstat(fsal_error, retval);
}
/*
* NOTE: this is done under protection of the attributes rwlock
* in the cache entry.
*/
static fsal_status_t setattrs(struct fsal_obj_handle *obj_hdl,
struct attrlist *attrs)
{
struct vfs_fsal_obj_handle *myself;
struct closefd cfd = { .fd = -1, .close_fd = false };
struct stat stat;
fsal_errors_t fsal_error = ERR_FSAL_NO_ERROR;
int retval = 0;
int open_flags = O_RDONLY;
/* apply umask, if mode attribute is to be changed */
if (FSAL_TEST_MASK(attrs->mask, ATTR_MODE))
attrs->mode &= ~op_ctx->fsal_export->exp_ops.
fs_umask(op_ctx->fsal_export);
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
if (obj_hdl->fsal != obj_hdl->fs->fsal) {
LogDebug(COMPONENT_FSAL,
"FSAL %s operation for handle belonging to FSAL %s, return EXDEV",
obj_hdl->fsal->name,
obj_hdl->fs->fsal != NULL
? obj_hdl->fs->fsal->name
: "(none)");
retval = EXDEV;
fsal_error = posix2fsal_error(retval);
goto hdlerr;
}
/* This is yet another "you can't get there from here". If this object
* is a socket (AF_UNIX), an fd on the socket s useless _period_.
* If it is for a symlink, without O_PATH, you will get an ELOOP error
* and (f)chmod doesn't work for a symlink anyway - not that it matters
* because access checking is not done on the symlink but the final
* target.
* AF_UNIX sockets are also ozone material. If the socket is already
* active listeners et al, you can manipulate the mode etc. If it is
* just sitting there as in you made it with a mknod.
* (one of those leaky abstractions...)
* or the listener forgot to unlink it, it is lame duck.
*/
if (FSAL_TEST_MASK(attrs->mask, ATTR_SIZE))
open_flags = O_RDWR;
cfd = vfs_fsal_open_and_stat(op_ctx->fsal_export, myself, &stat,
open_flags, &fsal_error);
if (cfd.fd < 0) {
if (obj_hdl->type == SYMBOLIC_LINK &&
cfd.fd == -EPERM) {
/* You cannot open_by_handle (XFS) a symlink and it
* throws an EPERM error for it. open_by_handle_at
* does not throw that error for symlinks so we play a
* game here. Since there is not much we can do with
* symlinks anyway, say that we did it
* but don't actually do anything.
* If you *really* want to tweek things
* like owners, get a modern linux kernel...
*/
fsal_error = ERR_FSAL_NO_ERROR;
goto out;
}
return fsalstat(fsal_error, cfd.fd);
}
/** TRUNCATE **/
if (FSAL_TEST_MASK(attrs->mask, ATTR_SIZE)) {
if (obj_hdl->type != REGULAR_FILE) {
fsal_error = ERR_FSAL_INVAL;
goto fileerr;
}
retval = ftruncate(cfd.fd, attrs->filesize);
if (retval != 0) {
/* XXX ESXi volume creation pattern reliably
* reaches this point and reliably can successfully
* ftruncate on reopen. I don't know yet if fd if
* we failed to handle a previous error, or what.
* I don't see a prior failed op in wireshark. */
if (retval == -1 /* bad fd */) {
vfs_close(obj_hdl);
if (cfd.close_fd)
close(cfd.fd);
cfd = vfs_fsal_open_and_stat(
op_ctx->fsal_export,
myself, &stat,
open_flags,
&fsal_error);
retval = ftruncate(cfd.fd, attrs->filesize);
if (retval != 0)
goto fileerr;
} else
goto fileerr;
}
}
/** CHMOD **/
if (FSAL_TEST_MASK(attrs->mask, ATTR_MODE)) {
/* The POSIX chmod call doesn't affect the symlink object, but
* the entry it points to. So we must ignore it.
*/
if (!S_ISLNK(stat.st_mode)) {
if (vfs_unopenable_type(obj_hdl->type))
retval = fchmodat(cfd.fd,
myself->u.unopenable.name,
fsal2unix_mode(attrs->mode),
0);
else
retval = fchmod(cfd.fd,
fsal2unix_mode(attrs->mode));
if (retval != 0)
goto fileerr;
}
}
/** CHOWN **/
if (FSAL_TEST_MASK(attrs->mask, ATTR_OWNER | ATTR_GROUP)) {
uid_t user = FSAL_TEST_MASK(attrs->mask, ATTR_OWNER)
? (int)attrs->owner : -1;
gid_t group = FSAL_TEST_MASK(attrs->mask, ATTR_GROUP)
? (int)attrs->group : -1;
if (vfs_unopenable_type(obj_hdl->type))
retval = fchownat(cfd.fd, myself->u.unopenable.name,
user, group, AT_SYMLINK_NOFOLLOW);
else if (obj_hdl->type == SYMBOLIC_LINK)
retval = fchownat(cfd.fd, "", user, group,
AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH);
else
retval = fchown(cfd.fd, user, group);
if (retval)
goto fileerr;
}
/** UTIME **/
if (FSAL_TEST_MASK
(attrs->mask,
ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SERVER | ATTR_MTIME_SERVER)) {
struct timespec timebuf[2];
if (obj_hdl->type == SYMBOLIC_LINK)
goto out; /* Setting time on symlinks is illegal */
/* Atime */
if (FSAL_TEST_MASK(attrs->mask, ATTR_ATIME_SERVER)) {
timebuf[0].tv_sec = 0;
timebuf[0].tv_nsec = UTIME_NOW;
} else if (FSAL_TEST_MASK(attrs->mask, ATTR_ATIME)) {
timebuf[0] = attrs->atime;
} else {
timebuf[0].tv_sec = 0;
timebuf[0].tv_nsec = UTIME_OMIT;
}
/* Mtime */
if (FSAL_TEST_MASK(attrs->mask, ATTR_MTIME_SERVER)) {
timebuf[1].tv_sec = 0;
timebuf[1].tv_nsec = UTIME_NOW;
} else if (FSAL_TEST_MASK(attrs->mask, ATTR_MTIME)) {
timebuf[1] = attrs->mtime;
} else {
timebuf[1].tv_sec = 0;
timebuf[1].tv_nsec = UTIME_OMIT;
}
if (vfs_unopenable_type(obj_hdl->type))
retval = vfs_utimesat(cfd.fd, myself->u.unopenable.name,
timebuf, AT_SYMLINK_NOFOLLOW);
else
retval = vfs_utimes(cfd.fd, timebuf);
if (retval != 0)
goto fileerr;
}
goto out;
fileerr:
retval = errno;
fsal_error = posix2fsal_error(retval);
out:
if (cfd.close_fd)
close(cfd.fd);
hdlerr:
return fsalstat(fsal_error, retval);
}
/* file_unlink
* unlink the named file in the directory
*/
static fsal_status_t file_unlink(struct fsal_obj_handle *dir_hdl,
const char *name)
{
struct vfs_fsal_obj_handle *myself;
fsal_errors_t fsal_error = ERR_FSAL_NO_ERROR;
struct stat stat;
int fd;
int retval = 0;
myself = container_of(dir_hdl, struct vfs_fsal_obj_handle, obj_handle);
if (dir_hdl->fsal != dir_hdl->fs->fsal) {
LogDebug(COMPONENT_FSAL,
"FSAL %s operation for handle belonging to FSAL %s, return EXDEV",
dir_hdl->fsal->name,
dir_hdl->fs->fsal != NULL
? dir_hdl->fs->fsal->name
: "(none)");
retval = EXDEV;
fsal_error = posix2fsal_error(retval);
goto out;
}
fd = vfs_fsal_open(myself, O_PATH | O_NOACCESS, &fsal_error);
if (fd < 0) {
retval = -fd;
goto out;
}
retval = fstatat(fd, name, &stat, AT_SYMLINK_NOFOLLOW);
if (retval < 0) {
retval = errno;
LogDebug(COMPONENT_FSAL, "fstatat %s failed %s", name,
strerror(retval));
if (retval == ENOENT)
fsal_error = ERR_FSAL_STALE;
else
fsal_error = posix2fsal_error(retval);
goto errout;
}
fsal_set_credentials(op_ctx->creds);
retval = unlinkat(fd, name, (S_ISDIR(stat.st_mode)) ? AT_REMOVEDIR : 0);
if (retval < 0) {
retval = errno;
if (retval == ENOENT)
fsal_error = ERR_FSAL_STALE;
else
fsal_error = posix2fsal_error(retval);
}
fsal_restore_ganesha_credentials();
errout:
close(fd);
out:
return fsalstat(fsal_error, retval);
}
/* handle_digest
* fill in the opaque f/s file handle part.
* we zero the buffer to length first. This MAY already be done above
* at which point, remove memset here because the caller is zeroing
* the whole struct.
*/
static fsal_status_t handle_digest(const struct fsal_obj_handle *obj_hdl,
fsal_digesttype_t output_type,
struct gsh_buffdesc *fh_desc)
{
const struct vfs_fsal_obj_handle *myself;
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
if (obj_hdl->fsal != obj_hdl->fs->fsal) {
/* Log, but allow digest */
LogDebug(COMPONENT_FSAL,
"FSAL %s operation for handle belonging to FSAL %s",
obj_hdl->fsal->name,
obj_hdl->fs->fsal != NULL
? obj_hdl->fs->fsal->name
: "(none)");
}
switch (output_type) {
case FSAL_DIGEST_NFSV3:
case FSAL_DIGEST_NFSV4:
if (fh_desc->len < myself->handle->handle_len) {
LogMajor(COMPONENT_FSAL,
"Space too small for handle. need %d, have %lu",
(int) myself->handle->handle_len,
fh_desc->len);
return fsalstat(ERR_FSAL_TOOSMALL, 0);
}
memcpy(fh_desc->addr,
myself->handle->handle_data,
myself->handle->handle_len);
break;
default:
return fsalstat(ERR_FSAL_SERVERFAULT, 0);
}
fh_desc->len = myself->handle->handle_len;
return fsalstat(ERR_FSAL_NO_ERROR, 0);
}
/**
* handle_to_key
* return a handle descriptor into the handle in this object handle
* @TODO reminder. make sure things like hash keys don't point here
* after the handle is released.
*/
static void handle_to_key(struct fsal_obj_handle *obj_hdl,
struct gsh_buffdesc *fh_desc)
{
struct vfs_fsal_obj_handle *myself;
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
fh_desc->addr = myself->handle->handle_data;
fh_desc->len = myself->handle->handle_len;
}
/*
* release
* release our export first so they know we are gone
*/
static void release(struct fsal_obj_handle *obj_hdl)
{
struct vfs_fsal_obj_handle *myself;
object_file_type_t type = obj_hdl->type;
myself = container_of(obj_hdl, struct vfs_fsal_obj_handle, obj_handle);
if (type == REGULAR_FILE) {
fsal_status_t st = vfs_close(obj_hdl);
if (FSAL_IS_ERROR(st)) {
LogCrit(COMPONENT_FSAL,
"Could not close hdl 0x%p, error %s(%d)",
obj_hdl, strerror(st.minor), st.minor);
}
}
fsal_obj_handle_fini(obj_hdl);
if (type == SYMBOLIC_LINK) {
if (myself->u.symlink.link_content != NULL)
gsh_free(myself->u.symlink.link_content);
} else if (vfs_unopenable_type(type)) {
if (myself->u.unopenable.name != NULL)
gsh_free(myself->u.unopenable.name);
if (myself->u.unopenable.dir != NULL)
gsh_free(myself->u.unopenable.dir);
}
gsh_free(myself);
}
void vfs_handle_ops_init(struct fsal_obj_ops *ops)
{
ops->release = release;
ops->lookup = lookup;
ops->readdir = read_dirents;
ops->create = create;
ops->mkdir = makedir;
ops->mknode = makenode;
ops->symlink = makesymlink;
ops->readlink = readsymlink;
ops->test_access = fsal_test_access;
ops->getattrs = getattrs;
ops->setattrs = setattrs;
ops->link = linkfile;
ops->rename = renamefile;
ops->unlink = file_unlink;
ops->open = vfs_open;
ops->status = vfs_status;
ops->read = vfs_read;
ops->write = vfs_write;
ops->commit = vfs_commit;
ops->lock_op = vfs_lock_op;
ops->close = vfs_close;
ops->lru_cleanup = vfs_lru_cleanup;
ops->handle_digest = handle_digest;
ops->handle_to_key = handle_to_key;
/* xattr related functions */
ops->list_ext_attrs = vfs_list_ext_attrs;
ops->getextattr_id_by_name = vfs_getextattr_id_by_name;
ops->getextattr_value_by_name = vfs_getextattr_value_by_name;
ops->getextattr_value_by_id = vfs_getextattr_value_by_id;
ops->setextattr_value = vfs_setextattr_value;
ops->setextattr_value_by_id = vfs_setextattr_value_by_id;
ops->getextattr_attrs = vfs_getextattr_attrs;
ops->remove_extattr_by_id = vfs_remove_extattr_by_id;
ops->remove_extattr_by_name = vfs_remove_extattr_by_name;
}
/* export methods that create object handles
*/
/* lookup_path
* modeled on old api except we don't stuff attributes.
* KISS
*/
fsal_status_t vfs_lookup_path(struct fsal_export *exp_hdl,
const char *path, struct fsal_obj_handle **handle)
{
int dir_fd = -1;
struct stat stat;
struct vfs_fsal_obj_handle *hdl;
fsal_errors_t fsal_error = ERR_FSAL_NO_ERROR;
int retval = 0;
struct fsal_filesystem *fs;
struct fsal_dev__ dev;
vfs_file_handle_t *fh = NULL;
vfs_alloc_handle(fh);
*handle = NULL; /* poison it */
dir_fd = open_dir_by_path_walk(-1, path, &stat);
if (dir_fd < 0) {
LogCrit(COMPONENT_FSAL,
"Could not open directory for path %s",
path);
retval = -dir_fd;
goto errout;
}
dev = posix2fsal_devt(stat.st_dev);
fs = lookup_dev(&dev);
if (fs == NULL) {
LogInfo(COMPONENT_FSAL,
"Could not find file system for path %s",
path);
retval = ENOENT;
goto errout;
}
if (fs->fsal != exp_hdl->fsal) {
LogInfo(COMPONENT_FSAL,
"File system for path %s did not belong to FSAL %s",
path, exp_hdl->fsal->name);
retval = EACCES;
goto errout;
}
LogDebug(COMPONENT_FSAL,
"filesystem %s for path %s",
fs->path, path);
retval = vfs_fd_to_handle(dir_fd, fs, fh);
if (retval < 0) {
retval = errno;
LogCrit(COMPONENT_FSAL,
"Could not get handle for path %s, error %s",
path, strerror(retval));
goto errout;
}
/* allocate an obj_handle and fill it up */
hdl = alloc_handle(-1, fh, fs, &stat, NULL, "", exp_hdl);
if (hdl == NULL) {
retval = ENOMEM;
LogCrit(COMPONENT_FSAL,
"Could not allocate handle for path %s",
path);
goto errout;
}
close(dir_fd);
*handle = &hdl->obj_handle;
return fsalstat(ERR_FSAL_NO_ERROR, 0);
errout:
if (dir_fd >= 0)
close(dir_fd);
fsal_error = posix2fsal_error(retval);
return fsalstat(fsal_error, retval);
}
fsal_status_t vfs_check_handle(struct fsal_export *exp_hdl,
struct gsh_buffdesc *hdl_desc,
struct fsal_filesystem **fs,
vfs_file_handle_t *fh,
bool *dummy)
{
fsal_errors_t fsal_error = ERR_FSAL_NO_ERROR;
int retval = 0;
struct fsal_fsid__ fsid;
enum fsid_type fsid_type;
*fs = NULL;
if (!vfs_valid_handle(hdl_desc))
return fsalstat(ERR_FSAL_BADHANDLE, 0);
memcpy(fh->handle_data, hdl_desc->addr, hdl_desc->len);
fh->handle_len = hdl_desc->len;
*dummy = vfs_is_dummy_handle(fh);
retval = vfs_extract_fsid(fh, &fsid_type, &fsid);
if (retval == 0) {
*fs = lookup_fsid(&fsid, fsid_type);
if (*fs == NULL) {
LogInfo(COMPONENT_FSAL,
"Could not map "
"fsid=0x%016"PRIx64".0x%016"PRIx64
" to filesytem",
fsid.major, fsid.minor);
retval = ESTALE;
fsal_error = posix2fsal_error(retval);
goto errout;
}
if (((*fs)->fsal != exp_hdl->fsal) && !(*dummy)) {
LogInfo(COMPONENT_FSAL,
"fsid=0x%016"PRIx64".0x%016"PRIx64
" in handle not a %s filesystem",
fsid.major, fsid.minor,
exp_hdl->fsal->name);
retval = ESTALE;
fsal_error = posix2fsal_error(retval);
goto errout;
}
LogDebug(COMPONENT_FSAL,
"Found filesystem %s for handle for FSAL %s",
(*fs)->path,
(*fs)->fsal != NULL ? (*fs)->fsal->name : "(none)");
} else {
LogDebug(COMPONENT_FSAL,
"Could not map handle to fsid");
fsal_error = ERR_FSAL_BADHANDLE;
goto errout;
}
errout:
return fsalstat(fsal_error, retval);
}
