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OpenZFS restructuring - libzfs 

Factor Linux specific functionality out of libzfs.

Reviewed-by: Allan Jude <allanjude@freebsd.org>
Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Macy <mmacy@FreeBSD.org>
Closes #9377
This commit is contained in:
Matthew Macy 2019-10-03 10:33:16 -07:00 committed by Brian Behlendorf
parent 7c5eff9400
commit 73cdcc6323
11 changed files with 1026 additions and 797 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
include/libzfs_impl.h
View File

@ -205,6 +205,52 @@ extern int zfs_parse_options(char *, zfs_share_proto_t);
extern int zfs_unshare_proto(zfs_handle_t *,
const char *, zfs_share_proto_t *);
typedef struct {
zfs_prop_t p_prop;
char *p_name;
int p_share_err;
int p_unshare_err;
} proto_table_t;
typedef struct differ_info {
zfs_handle_t *zhp;
char *fromsnap;
char *frommnt;
char *tosnap;
char *tomnt;
char *ds;
char *dsmnt;
char *tmpsnap;
char errbuf[1024];
boolean_t isclone;
boolean_t scripted;
boolean_t classify;
boolean_t timestamped;
uint64_t shares;
int zerr;
int cleanupfd;
int outputfd;
int datafd;
} differ_info_t;
extern proto_table_t proto_table[PROTO_END];
extern int do_mount(const char *src, const char *mntpt, char *opts, int flags);
extern int do_unmount(const char *mntpt, int flags);
extern int zfs_can_user_mount(void);
extern int zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto);
extern int unshare_one(libzfs_handle_t *hdl, const char *name,
const char *mountpoint, zfs_share_proto_t proto);
extern boolean_t zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
zprop_source_t *source, int flags);
extern zfs_share_type_t is_shared_impl(libzfs_handle_t *hdl,
const char *mountpoint, zfs_share_proto_t proto);
extern int libzfs_load_module(void);
extern int zpool_relabel_disk(libzfs_handle_t *hdl, const char *path,
const char *msg);
extern int find_shares_object(differ_info_t *di);
extern void libzfs_set_pipe_max(int infd);
#ifdef __cplusplus
}
#endif

18
lib/libzfs/Makefile.am
View File

@ -27,6 +27,15 @@ USER_C = \
libzfs_status.c \
libzfs_util.c
if BUILD_LINUX
USER_C += \
os/linux/libzfs_mount_os.c \
os/linux/libzfs_pool_os.c \
os/linux/libzfs_sendrecv_os.c \
os/linux/libzfs_util_os.c
endif
KERNEL_C = \
algs/sha2/sha2.c \
zfeature_common.c \
@ -51,14 +60,19 @@ nodist_libzfs_la_SOURCES = \
libzfs_la_LIBADD = \
$(top_builddir)/lib/libnvpair/libnvpair.la \
$(top_builddir)/lib/libshare/libshare.la \
$(top_builddir)/lib/libuutil/libuutil.la \
$(top_builddir)/lib/libzfs_core/libzfs_core.la \
$(top_builddir)/lib/libzutil/libzutil.la
libzfs_la_LIBADD += -lm $(LIBSSL)
if BUILD_LINUX
libzfs_la_LIBADD += \
$(top_builddir)/lib/libshare/libshare.la
endif
libzfs_la_LDFLAGS = -version-info 2:0:0
libzfs_la_LIBADD += -lm $(LIBSSL)
EXTRA_DIST = $(libzfs_pc_DATA) $(USER_C)
# Licensing data

42
lib/libzfs/libzfs_diff.c
View File

@ -48,7 +48,6 @@
#include "libzfs_impl.h"
#define ZDIFF_SNAPDIR "/.zfs/snapshot/"
#define ZDIFF_SHARESDIR "/.zfs/shares/"
#define ZDIFF_PREFIX "zfs-diff-%d"
#define ZDIFF_ADDED '+'
@ -56,26 +55,6 @@
#define ZDIFF_REMOVED '-'
#define ZDIFF_RENAMED 'R'
typedef struct differ_info {
zfs_handle_t *zhp;
char *fromsnap;
char *frommnt;
char *tosnap;
char *tomnt;
char *ds;
char *dsmnt;
char *tmpsnap;
char errbuf[1024];
boolean_t isclone;
boolean_t scripted;
boolean_t classify;
boolean_t timestamped;
uint64_t shares;
int zerr;
int cleanupfd;
int outputfd;
int datafd;
} differ_info_t;
/*
* Given a {dsname, object id}, get the object path
@ -487,25 +466,6 @@ differ(void *arg)
return ((void *)0);
}
static int
find_shares_object(differ_info_t *di)
{
char fullpath[MAXPATHLEN];
struct stat64 sb = { 0 };
(void) strlcpy(fullpath, di->dsmnt, MAXPATHLEN);
(void) strlcat(fullpath, ZDIFF_SHARESDIR, MAXPATHLEN);
if (stat64(fullpath, &sb) != 0) {
(void) snprintf(di->errbuf, sizeof (di->errbuf),
dgettext(TEXT_DOMAIN, "Cannot stat %s"), fullpath);
return (zfs_error(di->zhp->zfs_hdl, EZFS_DIFF, di->errbuf));
}
di->shares = (uint64_t)sb.st_ino;
return (0);
}
static int
make_temp_snapshot(differ_info_t *di)
{
@ -737,7 +697,7 @@ setup_differ_info(zfs_handle_t *zhp, const char *fromsnap,
{
di->zhp = zhp;
di->cleanupfd = open(ZFS_DEV, O_RDWR);
di->cleanupfd = open(ZFS_DEV, O_RDWR|O_EXCL);
VERIFY(di->cleanupfd >= 0);
if (get_snapshot_names(di, fromsnap, tosnap) != 0)

321
lib/libzfs/libzfs_mount.c
View File

@ -94,7 +94,6 @@
static int mount_tp_nthr = 512; /* tpool threads for multi-threaded mounting */
static void zfs_mount_task(void *);
static int zfs_share_proto(zfs_handle_t *, zfs_share_proto_t *);
zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
zfs_share_proto_t);
@ -102,13 +101,6 @@ zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
* The share protocols table must be in the same order as the zfs_share_proto_t
* enum in libzfs_impl.h
*/
typedef struct {
zfs_prop_t p_prop;
char *p_name;
int p_share_err;
int p_unshare_err;
} proto_table_t;
proto_table_t proto_table[PROTO_END] = {
{ZFS_PROP_SHARENFS, "nfs", EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED},
{ZFS_PROP_SHARESMB, "smb", EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED},
@ -129,60 +121,7 @@ zfs_share_proto_t share_all_proto[] = {
PROTO_END
};
/*
* Search the sharetab for the given mountpoint and protocol, returning
* a zfs_share_type_t value.
*/
static zfs_share_type_t
is_shared(libzfs_handle_t *hdl, const char *mountpoint, zfs_share_proto_t proto)
{
char buf[MAXPATHLEN], *tab;
char *ptr;
if (hdl->libzfs_sharetab == NULL)
return (SHARED_NOT_SHARED);
/* Reopen ZFS_SHARETAB to prevent reading stale data from open file */
if (freopen(ZFS_SHARETAB, "r", hdl->libzfs_sharetab) == NULL)
return (SHARED_NOT_SHARED);
(void) fseek(hdl->libzfs_sharetab, 0, SEEK_SET);
while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) {
/* the mountpoint is the first entry on each line */
if ((tab = strchr(buf, '\t')) == NULL)
continue;
*tab = '\0';
if (strcmp(buf, mountpoint) == 0) {
/*
* the protocol field is the third field
* skip over second field
*/
ptr = ++tab;
if ((tab = strchr(ptr, '\t')) == NULL)
continue;
ptr = ++tab;
if ((tab = strchr(ptr, '\t')) == NULL)
continue;
*tab = '\0';
if (strcmp(ptr,
proto_table[proto].p_name) == 0) {
switch (proto) {
case PROTO_NFS:
return (SHARED_NFS);
case PROTO_SMB:
return (SHARED_SMB);
default:
return (0);
}
}
}
}
return (SHARED_NOT_SHARED);
}
static boolean_t
dir_is_empty_stat(const char *dirname)
@ -304,7 +243,7 @@ zfs_is_mounted(zfs_handle_t *zhp, char **where)
* Returns true if the given dataset is mountable, false otherwise. Returns the
* mountpoint in 'buf'.
*/
static boolean_t
boolean_t
zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
zprop_source_t *source, int flags)
{
@ -329,10 +268,6 @@ zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
getzoneid() == GLOBAL_ZONEID)
return (B_FALSE);
if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) &&
getzoneid() == GLOBAL_ZONEID)
return (B_FALSE);
if (zfs_prop_get_int(zhp, ZFS_PROP_REDACTED) && !(flags & MS_FORCE))
return (B_FALSE);
@ -359,68 +294,6 @@ zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
* http://www.kernel.org/pub/linux/utils/util-linux/libmount-docs/index.html
*/
static int
do_mount(const char *src, const char *mntpt, char *opts)
{
char *argv[9] = {
"/bin/mount",
"--no-canonicalize",
"-t", MNTTYPE_ZFS,
"-o", opts,
(char *)src,
(char *)mntpt,
(char *)NULL };
int rc;
/* Return only the most critical mount error */
rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE);
if (rc) {
if (rc & MOUNT_FILEIO)
return (EIO);
if (rc & MOUNT_USER)
return (EINTR);
if (rc & MOUNT_SOFTWARE)
return (EPIPE);
if (rc & MOUNT_BUSY)
return (EBUSY);
if (rc & MOUNT_SYSERR)
return (EAGAIN);
if (rc & MOUNT_USAGE)
return (EINVAL);
return (ENXIO); /* Generic error */
}
return (0);
}
static int
do_unmount(const char *mntpt, int flags)
{
char force_opt[] = "-f";
char lazy_opt[] = "-l";
char *argv[7] = {
"/bin/umount",
"-t", MNTTYPE_ZFS,
NULL, NULL, NULL, NULL };
int rc, count = 3;
if (flags & MS_FORCE) {
argv[count] = force_opt;
count++;
}
if (flags & MS_DETACH) {
argv[count] = lazy_opt;
count++;
}
argv[count] = (char *)mntpt;
rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE);
return (rc ? EINVAL : 0);
}
static int
zfs_add_option(zfs_handle_t *zhp, char *options, int len,
zfs_prop_t prop, char *on, char *off)
@ -503,9 +376,8 @@ zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
(void) strlcat(mntopts, "," MNTOPT_RO, sizeof (mntopts));
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL,
flags)) {
flags))
return (0);
}
/*
* Append default mount options which apply to the mount point.
@ -599,7 +471,7 @@ zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
}
/* perform the mount */
rc = do_mount(zfs_get_name(zhp), mountpoint, mntopts);
rc = do_mount(zfs_get_name(zhp), mountpoint, mntopts, flags);
if (rc) {
/*
* Generic errors are nasty, but there are just way too many
@ -793,7 +665,7 @@ zfs_is_shared_proto(zfs_handle_t *zhp, char **where, zfs_share_proto_t proto)
if (!zfs_is_mounted(zhp, &mountpoint))
return (SHARED_NOT_SHARED);
if ((rc = is_shared(zhp->zfs_hdl, mountpoint, proto))
if ((rc = is_shared_impl(zhp->zfs_hdl, mountpoint, proto))
!= SHARED_NOT_SHARED) {
if (where != NULL)
*where = mountpoint;
@ -820,44 +692,6 @@ zfs_is_shared_smb(zfs_handle_t *zhp, char **where)
PROTO_SMB) != SHARED_NOT_SHARED);
}
/*
* zfs_init_libshare(zhandle, service)
*
* Initialize the libshare API if it hasn't already been initialized.
* In all cases it returns 0 if it succeeded and an error if not. The
* service value is which part(s) of the API to initialize and is a
* direct map to the libshare sa_init(service) interface.
*/
int
zfs_init_libshare(libzfs_handle_t *zhandle, int service)
{
int ret = SA_OK;
if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) {
/*
* We had a cache miss. Most likely it is a new ZFS
* dataset that was just created. We want to make sure
* so check timestamps to see if a different process
* has updated any of the configuration. If there was
* some non-ZFS change, we need to re-initialize the
* internal cache.
*/
zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS;
if (sa_needs_refresh(zhandle->libzfs_sharehdl)) {
zfs_uninit_libshare(zhandle);
zhandle->libzfs_sharehdl = sa_init(service);
}
}
if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL)
zhandle->libzfs_sharehdl = sa_init(service);
if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL)
ret = SA_NO_MEMORY;
return (ret);
}
/*
* zfs_uninit_libshare(zhandle)
*
@ -886,102 +720,6 @@ zfs_parse_options(char *options, zfs_share_proto_t proto)
proto_table[proto].p_name));
}
/*
* Share the given filesystem according to the options in the specified
* protocol specific properties (sharenfs, sharesmb). We rely
* on "libshare" to do the dirty work for us.
*/
static int
zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
{
char mountpoint[ZFS_MAXPROPLEN];
char shareopts[ZFS_MAXPROPLEN];
char sourcestr[ZFS_MAXPROPLEN];
libzfs_handle_t *hdl = zhp->zfs_hdl;
sa_share_t share;
zfs_share_proto_t *curr_proto;
zprop_source_t sourcetype;
int ret;
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL, 0))
return (0);
for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {
/*
* Return success if there are no share options.
*/
if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop,
shareopts, sizeof (shareopts), &sourcetype, sourcestr,
ZFS_MAXPROPLEN, B_FALSE) != 0 ||
strcmp(shareopts, "off") == 0)
continue;
ret = zfs_init_libshare(hdl, SA_INIT_SHARE_API);
if (ret != SA_OK) {
(void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
zfs_get_name(zhp), sa_errorstr(ret));
return (-1);
}
/*
* If the 'zoned' property is set, then zfs_is_mountable()
* will have already bailed out if we are in the global zone.
* But local zones cannot be NFS servers, so we ignore it for
* local zones as well.
*/
if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED))
continue;
share = sa_find_share(hdl->libzfs_sharehdl, mountpoint);
if (share == NULL) {
/*
* This may be a new file system that was just
* created so isn't in the internal cache
* (second time through). Rather than
* reloading the entire configuration, we can
* assume ZFS has done the checking and it is
* safe to add this to the internal
* configuration.
*/
if (sa_zfs_process_share(hdl->libzfs_sharehdl,
NULL, NULL, mountpoint,
proto_table[*curr_proto].p_name, sourcetype,
shareopts, sourcestr, zhp->zfs_name) != SA_OK) {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
hdl->libzfs_shareflags |= ZFSSHARE_MISS;
share = sa_find_share(hdl->libzfs_sharehdl,
mountpoint);
}
if (share != NULL) {
int err;
err = sa_enable_share(share,
proto_table[*curr_proto].p_name);
if (err != SA_OK) {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
} else {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
}
return (0);
}
int
zfs_share_nfs(zfs_handle_t *zhp)
{
@ -1000,50 +738,6 @@ zfs_shareall(zfs_handle_t *zhp)
return (zfs_share_proto(zhp, share_all_proto));
}
/*
* Unshare a filesystem by mountpoint.
*/
static int
unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
zfs_share_proto_t proto)
{
sa_share_t share;
int err;
char *mntpt;
/*
* Mountpoint could get trashed if libshare calls getmntany
* which it does during API initialization, so strdup the
* value.
*/
mntpt = zfs_strdup(hdl, mountpoint);
/* make sure libshare initialized */
if ((err = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
free(mntpt); /* don't need the copy anymore */
return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
name, sa_errorstr(err)));
}
share = sa_find_share(hdl->libzfs_sharehdl, mntpt);
free(mntpt); /* don't need the copy anymore */
if (share != NULL) {
err = sa_disable_share(share, proto_table[proto].p_name);
if (err != SA_OK) {
return (zfs_error_fmt(hdl,
proto_table[proto].p_unshare_err,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
name, sa_errorstr(err)));
}
} else {
return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': not found"),
name));
}
return (0);
}
/*
* Unshare the given filesystem.
*/
@ -1069,7 +763,7 @@ zfs_unshare_proto(zfs_handle_t *zhp, const char *mountpoint,
for (curr_proto = proto; *curr_proto != PROTO_END;
curr_proto++) {
if (is_shared(hdl, mntpt, *curr_proto) &&
if (is_shared_impl(hdl, mntpt, *curr_proto) &&
unshare_one(hdl, zhp->zfs_name,
mntpt, *curr_proto) != 0) {
if (mntpt != NULL)
@ -1170,7 +864,8 @@ remove_mountpoint(zfs_handle_t *zhp)
char mountpoint[ZFS_MAXPROPLEN];
zprop_source_t source;
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), &source, 0))
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint),
&source, 0))
return;
if (source == ZPROP_SRC_DEFAULT ||
@ -1738,7 +1433,7 @@ zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
zfs_share_proto_t *curr_proto;
for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
curr_proto++) {
if (is_shared(hdl, mountpoints[i], *curr_proto) &&
if (is_shared_impl(hdl, mountpoints[i], *curr_proto) &&
unshare_one(hdl, mountpoints[i],
mountpoints[i], *curr_proto) != 0)
goto out;

295
lib/libzfs/libzfs_pool.c
View File

@ -41,7 +41,6 @@
#include <sys/stat.h>
#include <sys/efi_partition.h>
#include <sys/systeminfo.h>
#include <sys/vtoc.h>
#include <sys/zfs_ioctl.h>
#include <sys/vdev_disk.h>
#include <dlfcn.h>
@ -53,7 +52,6 @@
#include "zfs_comutil.h"
#include "zfeature_common.h"
static int read_efi_label(nvlist_t *config, diskaddr_t *sb);
static boolean_t zpool_vdev_is_interior(const char *name);
typedef struct prop_flags {
@ -2814,45 +2812,6 @@ zpool_get_physpath(zpool_handle_t *zhp, char *physpath, size_t phypath_size)
phypath_size));
}
/*
* If the device has being dynamically expanded then we need to relabel
* the disk to use the new unallocated space.
*/
static int
zpool_relabel_disk(libzfs_handle_t *hdl, const char *path, const char *msg)
{
int fd, error;
if ((fd = open(path, O_RDWR|O_DIRECT)) < 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"relabel '%s': unable to open device: %d"), path, errno);
return (zfs_error(hdl, EZFS_OPENFAILED, msg));
}
/*
* It's possible that we might encounter an error if the device
* does not have any unallocated space left. If so, we simply
* ignore that error and continue on.
*
* Also, we don't call efi_rescan() - that would just return EBUSY.
* The module will do it for us in vdev_disk_open().
*/
error = efi_use_whole_disk(fd);
/* Flush the buffers to disk and invalidate the page cache. */
(void) fsync(fd);
(void) ioctl(fd, BLKFLSBUF);
(void) close(fd);
if (error && error != VT_ENOSPC) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"relabel '%s': unable to read disk capacity"), path);
return (zfs_error(hdl, EZFS_NOCAP, msg));
}
return (0);
}
/*
* Convert a vdev path to a GUID. Returns GUID or 0 on error.
*
@ -4432,260 +4391,6 @@ zpool_obj_to_path(zpool_handle_t *zhp, uint64_t dsobj, uint64_t obj,
free(mntpnt);
}
/*
* Read the EFI label from the config, if a label does not exist then
* pass back the error to the caller. If the caller has passed a non-NULL
* diskaddr argument then we set it to the starting address of the EFI
* partition.
*/
static int
read_efi_label(nvlist_t *config, diskaddr_t *sb)
{
char *path;
int fd;
char diskname[MAXPATHLEN];
int err = -1;
if (nvlist_lookup_string(config, ZPOOL_CONFIG_PATH, &path) != 0)
return (err);
(void) snprintf(diskname, sizeof (diskname), "%s%s", DISK_ROOT,
strrchr(path, '/'));
if ((fd = open(diskname, O_RDONLY|O_DIRECT)) >= 0) {
struct dk_gpt *vtoc;
if ((err = efi_alloc_and_read(fd, &vtoc)) >= 0) {
if (sb != NULL)
*sb = vtoc->efi_parts[0].p_start;
efi_free(vtoc);
}
(void) close(fd);
}
return (err);
}
/*
* determine where a partition starts on a disk in the current
* configuration
*/
static diskaddr_t
find_start_block(nvlist_t *config)
{
nvlist_t **child;
uint_t c, children;
diskaddr_t sb = MAXOFFSET_T;
uint64_t wholedisk;
if (nvlist_lookup_nvlist_array(config,
ZPOOL_CONFIG_CHILDREN, &child, &children) != 0) {
if (nvlist_lookup_uint64(config,
ZPOOL_CONFIG_WHOLE_DISK,
&wholedisk) != 0 || !wholedisk) {
return (MAXOFFSET_T);
}
if (read_efi_label(config, &sb) < 0)
sb = MAXOFFSET_T;
return (sb);
}
for (c = 0; c < children; c++) {
sb = find_start_block(child[c]);
if (sb != MAXOFFSET_T) {
return (sb);
}
}
return (MAXOFFSET_T);
}
static int
zpool_label_disk_check(char *path)
{
struct dk_gpt *vtoc;
int fd, err;
if ((fd = open(path, O_RDONLY|O_DIRECT)) < 0)
return (errno);
if ((err = efi_alloc_and_read(fd, &vtoc)) != 0) {
(void) close(fd);
return (err);
}
if (vtoc->efi_flags & EFI_GPT_PRIMARY_CORRUPT) {
efi_free(vtoc);
(void) close(fd);
return (EIDRM);
}
efi_free(vtoc);
(void) close(fd);
return (0);
}
/*
* Generate a unique partition name for the ZFS member. Partitions must
* have unique names to ensure udev will be able to create symlinks under
* /dev/disk/by-partlabel/ for all pool members. The partition names are
* of the form <pool>-<unique-id>.
*/
static void
zpool_label_name(char *label_name, int label_size)
{
uint64_t id = 0;
int fd;
fd = open("/dev/urandom", O_RDONLY);
if (fd >= 0) {
if (read(fd, &id, sizeof (id)) != sizeof (id))
id = 0;
close(fd);
}
if (id == 0)
id = (((uint64_t)rand()) << 32) | (uint64_t)rand();
snprintf(label_name, label_size, "zfs-%016llx", (u_longlong_t)id);
}
/*
* Label an individual disk. The name provided is the short name,
* stripped of any leading /dev path.
*/
int
zpool_label_disk(libzfs_handle_t *hdl, zpool_handle_t *zhp, char *name)
{
char path[MAXPATHLEN];
struct dk_gpt *vtoc;
int rval, fd;
size_t resv = EFI_MIN_RESV_SIZE;
uint64_t slice_size;
diskaddr_t start_block;
char errbuf[1024];
/* prepare an error message just in case */
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN, "cannot label '%s'"), name);
if (zhp) {
nvlist_t *nvroot;
verify(nvlist_lookup_nvlist(zhp->zpool_config,
ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
if (zhp->zpool_start_block == 0)
start_block = find_start_block(nvroot);
else
start_block = zhp->zpool_start_block;
zhp->zpool_start_block = start_block;
} else {
/* new pool */
start_block = NEW_START_BLOCK;
}
(void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT, name);
if ((fd = open(path, O_RDWR|O_DIRECT|O_EXCL)) < 0) {
/*
* This shouldn't happen. We've long since verified that this
* is a valid device.
*/
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"label '%s': unable to open device: %d"), path, errno);
return (zfs_error(hdl, EZFS_OPENFAILED, errbuf));
}
if (efi_alloc_and_init(fd, EFI_NUMPAR, &vtoc) != 0) {
/*
* The only way this can fail is if we run out of memory, or we
* were unable to read the disk's capacity
*/
if (errno == ENOMEM)
(void) no_memory(hdl);
(void) close(fd);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"label '%s': unable to read disk capacity"), path);
return (zfs_error(hdl, EZFS_NOCAP, errbuf));
}
slice_size = vtoc->efi_last_u_lba + 1;
slice_size -= EFI_MIN_RESV_SIZE;
if (start_block == MAXOFFSET_T)
start_block = NEW_START_BLOCK;
slice_size -= start_block;
slice_size = P2ALIGN(slice_size, PARTITION_END_ALIGNMENT);
vtoc->efi_parts[0].p_start = start_block;
vtoc->efi_parts[0].p_size = slice_size;
/*
* Why we use V_USR: V_BACKUP confuses users, and is considered
* disposable by some EFI utilities (since EFI doesn't have a backup
* slice). V_UNASSIGNED is supposed to be used only for zero size
* partitions, and efi_write() will fail if we use it. V_ROOT, V_BOOT,
* etc. were all pretty specific. V_USR is as close to reality as we
* can get, in the absence of V_OTHER.
*/
vtoc->efi_parts[0].p_tag = V_USR;
zpool_label_name(vtoc->efi_parts[0].p_name, EFI_PART_NAME_LEN);
vtoc->efi_parts[8].p_start = slice_size + start_block;
vtoc->efi_parts[8].p_size = resv;
vtoc->efi_parts[8].p_tag = V_RESERVED;
rval = efi_write(fd, vtoc);
/* Flush the buffers to disk and invalidate the page cache. */
(void) fsync(fd);
(void) ioctl(fd, BLKFLSBUF);
if (rval == 0)
rval = efi_rescan(fd);
/*
* Some block drivers (like pcata) may not support EFI GPT labels.
* Print out a helpful error message directing the user to manually
* label the disk and give a specific slice.
*/
if (rval != 0) {
(void) close(fd);
efi_free(vtoc);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "try using "
"parted(8) and then provide a specific slice: %d"), rval);
return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
}
(void) close(fd);
efi_free(vtoc);
(void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT, name);
(void) zfs_append_partition(path, MAXPATHLEN);
/* Wait to udev to signal use the device has settled. */
rval = zpool_label_disk_wait(path, DISK_LABEL_WAIT);
if (rval) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "failed to "
"detect device partitions on '%s': %d"), path, rval);
return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
}
/* We can't be to paranoid. Read the label back and verify it. */
(void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT, name);
rval = zpool_label_disk_check(path);
if (rval) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "freshly written "
"EFI label on '%s' is damaged. Ensure\nthis device "
"is not in use, and is functioning properly: %d"),
path, rval);
return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
}
return (0);
}
/*
* Wait while the specified activity is in progress in the pool.
*/

35
lib/libzfs/libzfs_sendrecv.c
View File

@ -2479,7 +2479,7 @@ zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
++holdseq;
(void) snprintf(sdd.holdtag, sizeof (sdd.holdtag),
".send-%d-%llu", getpid(), (u_longlong_t)holdseq);
sdd.cleanup_fd = open(ZFS_DEV, O_RDWR);
sdd.cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
if (sdd.cleanup_fd < 0) {
err = errno;
goto stderr_out;
@ -5390,37 +5390,12 @@ zfs_receive(libzfs_handle_t *hdl, const char *tosnap, nvlist_t *props,
return (-2);
}
#ifdef __linux__
#ifndef F_SETPIPE_SZ
#define F_SETPIPE_SZ (F_SETLEASE + 7)
#endif /* F_SETPIPE_SZ */
#ifndef F_GETPIPE_SZ
#define F_GETPIPE_SZ (F_GETLEASE + 7)
#endif /* F_GETPIPE_SZ */
/*
* It is not uncommon for gigabytes to be processed in zfs receive.
* Speculatively increase the buffer size via Linux-specific fcntl()
* call.
* Speculatively increase the buffer size if supported by the platform.
*/
if (S_ISFIFO(sb.st_mode)) {
FILE *procf = fopen("/proc/sys/fs/pipe-max-size", "r");
if (procf != NULL) {
unsigned long max_psize;
long cur_psize;
if (fscanf(procf, "%lu", &max_psize) > 0) {
cur_psize = fcntl(infd, F_GETPIPE_SZ);
if (cur_psize > 0 &&
max_psize > (unsigned long) cur_psize)
(void) fcntl(infd, F_SETPIPE_SZ,
max_psize);
}
fclose(procf);
}
}
#endif /* __linux__ */
if (S_ISFIFO(sb.st_mode))
libzfs_set_pipe_max(infd);
if (props) {
err = nvlist_lookup_string(props, "origin", &originsnap);
@ -5428,7 +5403,7 @@ zfs_receive(libzfs_handle_t *hdl, const char *tosnap, nvlist_t *props,
return (err);
}
cleanup_fd = open(ZFS_DEV, O_RDWR);
cleanup_fd = open(ZFS_DEV, O_RDWR|O_EXCL);
VERIFY(cleanup_fd >= 0);
err = zfs_receive_impl(hdl, tosnap, originsnap, flags, infd, NULL, NULL,

118
lib/libzfs/libzfs_util.c
View File

@ -56,37 +56,13 @@
#include <libzutil.h>
#include <sys/zfs_sysfs.h>
int
libzfs_errno(libzfs_handle_t *hdl)
{
return (hdl->libzfs_error);
}
const char *
libzfs_error_init(int error)
{
switch (error) {
case ENXIO:
return (dgettext(TEXT_DOMAIN, "The ZFS modules are not "
"loaded.\nTry running '/sbin/modprobe zfs' as root "
"to load them."));
case ENOENT:
return (dgettext(TEXT_DOMAIN, "/dev/zfs and /proc/self/mounts "
"are required.\nTry running 'udevadm trigger' and 'mount "
"-t proc proc /proc' as root."));
case ENOEXEC:
return (dgettext(TEXT_DOMAIN, "The ZFS modules cannot be "
"auto-loaded.\nTry running '/sbin/modprobe zfs' as "
"root to manually load them."));
case EACCES:
return (dgettext(TEXT_DOMAIN, "Permission denied the "
"ZFS utilities must be run as root."));
default:
return (dgettext(TEXT_DOMAIN, "Failed to initialize the "
"libzfs library."));
}
}
const char *
libzfs_error_action(libzfs_handle_t *hdl)
{
@ -712,19 +688,6 @@ libzfs_print_on_error(libzfs_handle_t *hdl, boolean_t printerr)
hdl->libzfs_printerr = printerr;
}
static int
libzfs_module_loaded(const char *module)
{
const char path_prefix[] = "/sys/module/";
char path[256];
memcpy(path, path_prefix, sizeof (path_prefix) - 1);
strcpy(path + sizeof (path_prefix) - 1, module);
return (access(path, F_OK) == 0);
}
/*
* Read lines from an open file descriptor and store them in an array of
* strings until EOF. lines[] will be allocated and populated with all the
@ -903,84 +866,13 @@ libzfs_envvar_is_set(char *envvar)
return (0);
}
/*
* Verify the required ZFS_DEV device is available and optionally attempt
* to load the ZFS modules. Under normal circumstances the modules
* should already have been loaded by some external mechanism.
*
* Environment variables:
* - ZFS_MODULE_LOADING="YES|yes|ON|on" - Attempt to load modules.
* - ZFS_MODULE_TIMEOUT="<seconds>" - Seconds to wait for ZFS_DEV
*/
static int
libzfs_load_module(const char *module)
{
char *argv[4] = {"/sbin/modprobe", "-q", (char *)module, (char *)0};
char *load_str, *timeout_str;
long timeout = 10; /* seconds */
long busy_timeout = 10; /* milliseconds */
int load = 0, fd;
hrtime_t start;
/* Optionally request module loading */
if (!libzfs_module_loaded(module)) {
load_str = getenv("ZFS_MODULE_LOADING");
if (load_str) {
if (!strncasecmp(load_str, "YES", strlen("YES")) ||
!strncasecmp(load_str, "ON", strlen("ON")))
load = 1;
else
load = 0;
}
if (load) {
if (libzfs_run_process("/sbin/modprobe", argv, 0))
return (ENOEXEC);
}
if (!libzfs_module_loaded(module))
return (ENXIO);
}
/*
* Device creation by udev is asynchronous and waiting may be
* required. Busy wait for 10ms and then fall back to polling every
* 10ms for the allowed timeout (default 10s, max 10m). This is
* done to optimize for the common case where the device is
* immediately available and to avoid penalizing the possible
* case where udev is slow or unable to create the device.
*/
timeout_str = getenv("ZFS_MODULE_TIMEOUT");
if (timeout_str) {
timeout = strtol(timeout_str, NULL, 0);
timeout = MAX(MIN(timeout, (10 * 60)), 0); /* 0 <= N <= 600 */
}
start = gethrtime();
do {
fd = open(ZFS_DEV, O_RDWR);
if (fd >= 0) {
(void) close(fd);
return (0);
} else if (errno != ENOENT) {
return (errno);
} else if (NSEC2MSEC(gethrtime() - start) < busy_timeout) {
sched_yield();
} else {
usleep(10 * MILLISEC);
}
} while (NSEC2MSEC(gethrtime() - start) < (timeout * MILLISEC));
return (ENOENT);
}
libzfs_handle_t *
libzfs_init(void)
{
libzfs_handle_t *hdl;
int error;
error = libzfs_load_module(ZFS_DRIVER);
error = libzfs_load_module();
if (error) {
errno = error;
return (NULL);
@ -1215,12 +1107,6 @@ zcmd_read_dst_nvlist(libzfs_handle_t *hdl, zfs_cmd_t *zc, nvlist_t **nvlp)
return (0);
}
int
zfs_ioctl(libzfs_handle_t *hdl, int request, zfs_cmd_t *zc)
{
return (ioctl(hdl->libzfs_fd, request, zc));
}
/*
* ================================================================
* API shared by zfs and zpool property management

367
lib/libzfs/os/linux/libzfs_mount_os.c Normal file
View File

@ -0,0 +1,367 @@
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2019 by Delphix. All rights reserved.
* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
* Copyright 2017 RackTop Systems.
* Copyright (c) 2018 Datto Inc.
* Copyright 2018 OmniOS Community Edition (OmniOSce) Association.
*/
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <zone.h>
#include <sys/mntent.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/dsl_crypt.h>
#include <libzfs.h>
#include "libzfs_impl.h"
#include <thread_pool.h>
/*
* zfs_init_libshare(zhandle, service)
*
* Initialize the libshare API if it hasn't already been initialized.
* In all cases it returns 0 if it succeeded and an error if not. The
* service value is which part(s) of the API to initialize and is a
* direct map to the libshare sa_init(service) interface.
*/
int
zfs_init_libshare(libzfs_handle_t *zhandle, int service)
{
int ret = SA_OK;
if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) {
/*
* We had a cache miss. Most likely it is a new ZFS
* dataset that was just created. We want to make sure
* so check timestamps to see if a different process
* has updated any of the configuration. If there was
* some non-ZFS change, we need to re-initialize the
* internal cache.
*/
zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS;
if (sa_needs_refresh(zhandle->libzfs_sharehdl)) {
zfs_uninit_libshare(zhandle);
zhandle->libzfs_sharehdl = sa_init(service);
}
}
if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL)
zhandle->libzfs_sharehdl = sa_init(service);
if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL)
ret = SA_NO_MEMORY;
return (ret);
}
/*
* Share the given filesystem according to the options in the specified
* protocol specific properties (sharenfs, sharesmb). We rely
* on "libshare" to do the dirty work for us.
*/
int
zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
{
char mountpoint[ZFS_MAXPROPLEN];
char shareopts[ZFS_MAXPROPLEN];
char sourcestr[ZFS_MAXPROPLEN];
libzfs_handle_t *hdl = zhp->zfs_hdl;
sa_share_t share;
zfs_share_proto_t *curr_proto;
zprop_source_t sourcetype;
int err, ret;
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL, 0))
return (0);
for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {
/*
* Return success if there are no share options.
*/
if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop,
shareopts, sizeof (shareopts), &sourcetype, sourcestr,
ZFS_MAXPROPLEN, B_FALSE) != 0 ||
strcmp(shareopts, "off") == 0)
continue;
ret = zfs_init_libshare(hdl, SA_INIT_SHARE_API);
if (ret != SA_OK) {
(void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
zfs_get_name(zhp), sa_errorstr(ret));
return (-1);
}
/*
* If the 'zoned' property is set, then zfs_is_mountable()
* will have already bailed out if we are in the global zone.
* But local zones cannot be NFS servers, so we ignore it for
* local zones as well.
*/
if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED))
continue;
share = sa_find_share(hdl->libzfs_sharehdl, mountpoint);
if (share == NULL) {
/*
* This may be a new file system that was just
* created so isn't in the internal cache
* (second time through). Rather than
* reloading the entire configuration, we can
* assume ZFS has done the checking and it is
* safe to add this to the internal
* configuration.
*/
if (sa_zfs_process_share(hdl->libzfs_sharehdl,
NULL, NULL, mountpoint,
proto_table[*curr_proto].p_name, sourcetype,
shareopts, sourcestr, zhp->zfs_name) != SA_OK) {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
hdl->libzfs_shareflags |= ZFSSHARE_MISS;
share = sa_find_share(hdl->libzfs_sharehdl,
mountpoint);
}
if (share != NULL) {
err = sa_enable_share(share,
proto_table[*curr_proto].p_name);
if (err != SA_OK) {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
} else {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
}
return (0);
}
/*
* Unshare a filesystem by mountpoint.
*/
int
unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
zfs_share_proto_t proto)
{
sa_share_t share;
int err;
char *mntpt;
/*
* Mountpoint could get trashed if libshare calls getmntany
* which it does during API initialization, so strdup the
* value.
*/
mntpt = zfs_strdup(hdl, mountpoint);
/* make sure libshare initialized */
if ((err = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
free(mntpt); /* don't need the copy anymore */
return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
name, sa_errorstr(err)));
}
share = sa_find_share(hdl->libzfs_sharehdl, mntpt);
free(mntpt); /* don't need the copy anymore */
if (share != NULL) {
err = sa_disable_share(share, proto_table[proto].p_name);
if (err != SA_OK) {
return (zfs_error_fmt(hdl,
proto_table[proto].p_unshare_err,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
name, sa_errorstr(err)));
}
} else {
return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': not found"),
name));
}
return (0);
}
/*
* Search the sharetab for the given mountpoint and protocol, returning
* a zfs_share_type_t value.
*/
zfs_share_type_t
is_shared_impl(libzfs_handle_t *hdl, const char *mountpoint,
zfs_share_proto_t proto)
{
char buf[MAXPATHLEN], *tab;
char *ptr;
if (hdl->libzfs_sharetab == NULL)
return (SHARED_NOT_SHARED);
/* Reopen ZFS_SHARETAB to prevent reading stale data from open file */
if (freopen(ZFS_SHARETAB, "r", hdl->libzfs_sharetab) == NULL)
return (SHARED_NOT_SHARED);
(void) fseek(hdl->libzfs_sharetab, 0, SEEK_SET);
while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) {
/* the mountpoint is the first entry on each line */
if ((tab = strchr(buf, '\t')) == NULL)
continue;
*tab = '\0';
if (strcmp(buf, mountpoint) == 0) {
/*
* the protocol field is the third field
* skip over second field
*/
ptr = ++tab;
if ((tab = strchr(ptr, '\t')) == NULL)
continue;
ptr = ++tab;
if ((tab = strchr(ptr, '\t')) == NULL)
continue;
*tab = '\0';
if (strcmp(ptr,
proto_table[proto].p_name) == 0) {
switch (proto) {
case PROTO_NFS:
return (SHARED_NFS);
case PROTO_SMB:
return (SHARED_SMB);
default:
return (0);
}
}
}
}
return (SHARED_NOT_SHARED);
}
/*
* The filesystem is mounted by invoking the system mount utility rather
* than by the system call mount(2). This ensures that the /etc/mtab
* file is correctly locked for the update. Performing our own locking
* and /etc/mtab update requires making an unsafe assumption about how
* the mount utility performs its locking. Unfortunately, this also means
* in the case of a mount failure we do not have the exact errno. We must
* make due with return value from the mount process.
*
* In the long term a shared library called libmount is under development
* which provides a common API to address the locking and errno issues.
* Once the standard mount utility has been updated to use this library
* we can add an autoconf check to conditionally use it.
*
* http://www.kernel.org/pub/linux/utils/util-linux/libmount-docs/index.html
*/
int
do_mount(const char *src, const char *mntpt, char *opts, int flags)
{
char *argv[9] = {
"/bin/mount",
"--no-canonicalize",
"-t", MNTTYPE_ZFS,
"-o", opts,
(char *)src,
(char *)mntpt,
(char *)NULL };
int rc;
/* Return only the most critical mount error */
rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE);
if (rc) {
if (rc & MOUNT_FILEIO)
return (EIO);
if (rc & MOUNT_USER)
return (EINTR);
if (rc & MOUNT_SOFTWARE)
return (EPIPE);
if (rc & MOUNT_BUSY)
return (EBUSY);
if (rc & MOUNT_SYSERR)
return (EAGAIN);
if (rc & MOUNT_USAGE)
return (EINVAL);
return (ENXIO); /* Generic error */
}
return (0);
}
int
do_unmount(const char *mntpt, int flags)
{
char force_opt[] = "-f";
char lazy_opt[] = "-l";
char *argv[7] = {
"/bin/umount",
"-t", MNTTYPE_ZFS,
NULL, NULL, NULL, NULL };
int rc, count = 3;
if (flags & MS_FORCE) {
argv[count] = force_opt;
count++;
}
if (flags & MS_DETACH) {
argv[count] = lazy_opt;
count++;
}
argv[count] = (char *)mntpt;
rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE);
return (rc ? EINVAL : 0);
}
int
zfs_can_user_mount(void)
{
return (geteuid() == 0);
}

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011, 2018 by Delphix. All rights reserved.
* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
* Copyright (c) 2018 Datto Inc.
* Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
* Copyright (c) 2017, Intel Corporation.
* Copyright (c) 2018, loli10K <ezomori.nozomu@gmail.com>
*/
#include <errno.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <libgen.h>
#include <zone.h>
#include <sys/stat.h>
#include <sys/efi_partition.h>
#include <sys/systeminfo.h>
#include <sys/vtoc.h>
#include <sys/zfs_ioctl.h>
#include <sys/vdev_disk.h>
#include <dlfcn.h>
#include <libzutil.h>
#include "zfs_namecheck.h"
#include "zfs_prop.h"
#include "libzfs_impl.h"
#include "zfs_comutil.h"
#include "zfeature_common.h"
/*
* If the device has being dynamically expanded then we need to relabel
* the disk to use the new unallocated space.
*/
int
zpool_relabel_disk(libzfs_handle_t *hdl, const char *path, const char *msg)
{
int fd, error;
if ((fd = open(path, O_RDWR|O_DIRECT)) < 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"relabel '%s': unable to open device: %d"), path, errno);
return (zfs_error(hdl, EZFS_OPENFAILED, msg));
}
/*
* It's possible that we might encounter an error if the device
* does not have any unallocated space left. If so, we simply
* ignore that error and continue on.
*
* Also, we don't call efi_rescan() - that would just return EBUSY.
* The module will do it for us in vdev_disk_open().
*/
error = efi_use_whole_disk(fd);
/* Flush the buffers to disk and invalidate the page cache. */
(void) fsync(fd);
(void) ioctl(fd, BLKFLSBUF);
(void) close(fd);
if (error && error != VT_ENOSPC) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"relabel '%s': unable to read disk capacity"), path);
return (zfs_error(hdl, EZFS_NOCAP, msg));
}
return (0);
}
/*
* Read the EFI label from the config, if a label does not exist then
* pass back the error to the caller. If the caller has passed a non-NULL
* diskaddr argument then we set it to the starting address of the EFI
* partition.
*/
static int
read_efi_label(nvlist_t *config, diskaddr_t *sb)
{
char *path;
int fd;
char diskname[MAXPATHLEN];
int err = -1;
if (nvlist_lookup_string(config, ZPOOL_CONFIG_PATH, &path) != 0)
return (err);
(void) snprintf(diskname, sizeof (diskname), "%s%s", DISK_ROOT,
strrchr(path, '/'));
if ((fd = open(diskname, O_RDONLY|O_DIRECT)) >= 0) {
struct dk_gpt *vtoc;
if ((err = efi_alloc_and_read(fd, &vtoc)) >= 0) {
if (sb != NULL)
*sb = vtoc->efi_parts[0].p_start;
efi_free(vtoc);
}
(void) close(fd);
}
return (err);
}
/*
* determine where a partition starts on a disk in the current
* configuration
*/
static diskaddr_t
find_start_block(nvlist_t *config)
{
nvlist_t **child;
uint_t c, children;
diskaddr_t sb = MAXOFFSET_T;
uint64_t wholedisk;
if (nvlist_lookup_nvlist_array(config,
ZPOOL_CONFIG_CHILDREN, &child, &children) != 0) {
if (nvlist_lookup_uint64(config,
ZPOOL_CONFIG_WHOLE_DISK,
&wholedisk) != 0 || !wholedisk) {
return (MAXOFFSET_T);
}
if (read_efi_label(config, &sb) < 0)
sb = MAXOFFSET_T;
return (sb);
}
for (c = 0; c < children; c++) {
sb = find_start_block(child[c]);
if (sb != MAXOFFSET_T) {
return (sb);
}
}
return (MAXOFFSET_T);
}
static int
zpool_label_disk_check(char *path)
{
struct dk_gpt *vtoc;
int fd, err;
if ((fd = open(path, O_RDONLY|O_DIRECT)) < 0)
return (errno);
if ((err = efi_alloc_and_read(fd, &vtoc)) != 0) {
(void) close(fd);
return (err);
}
if (vtoc->efi_flags & EFI_GPT_PRIMARY_CORRUPT) {
efi_free(vtoc);
(void) close(fd);
return (EIDRM);
}
efi_free(vtoc);
(void) close(fd);
return (0);
}
/*
* Generate a unique partition name for the ZFS member. Partitions must
* have unique names to ensure udev will be able to create symlinks under
* /dev/disk/by-partlabel/ for all pool members. The partition names are
* of the form <pool>-<unique-id>.
*/
static void
zpool_label_name(char *label_name, int label_size)
{
uint64_t id = 0;
int fd;
fd = open("/dev/urandom", O_RDONLY);
if (fd >= 0) {
if (read(fd, &id, sizeof (id)) != sizeof (id))
id = 0;
close(fd);
}
if (id == 0)
id = (((uint64_t)rand()) << 32) | (uint64_t)rand();
snprintf(label_name, label_size, "zfs-%016llx", (u_longlong_t)id);
}
/*
* Label an individual disk. The name provided is the short name,
* stripped of any leading /dev path.
*/
int
zpool_label_disk(libzfs_handle_t *hdl, zpool_handle_t *zhp, char *name)
{
char path[MAXPATHLEN];
struct dk_gpt *vtoc;
int rval, fd;
size_t resv = EFI_MIN_RESV_SIZE;
uint64_t slice_size;
diskaddr_t start_block;
char errbuf[1024];
/* prepare an error message just in case */
(void) snprintf(errbuf, sizeof (errbuf),
dgettext(TEXT_DOMAIN, "cannot label '%s'"), name);
if (zhp) {
nvlist_t *nvroot;
verify(nvlist_lookup_nvlist(zhp->zpool_config,
ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0);
if (zhp->zpool_start_block == 0)
start_block = find_start_block(nvroot);
else
start_block = zhp->zpool_start_block;
zhp->zpool_start_block = start_block;
} else {
/* new pool */
start_block = NEW_START_BLOCK;
}
(void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT, name);
if ((fd = open(path, O_RDWR|O_DIRECT|O_EXCL)) < 0) {
/*
* This shouldn't happen. We've long since verified that this
* is a valid device.
*/
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"label '%s': unable to open device: %d"), path, errno);
return (zfs_error(hdl, EZFS_OPENFAILED, errbuf));
}
if (efi_alloc_and_init(fd, EFI_NUMPAR, &vtoc) != 0) {
/*
* The only way this can fail is if we run out of memory, or we
* were unable to read the disk's capacity
*/
if (errno == ENOMEM)
(void) no_memory(hdl);
(void) close(fd);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "cannot "
"label '%s': unable to read disk capacity"), path);
return (zfs_error(hdl, EZFS_NOCAP, errbuf));
}
slice_size = vtoc->efi_last_u_lba + 1;
slice_size -= EFI_MIN_RESV_SIZE;
if (start_block == MAXOFFSET_T)
start_block = NEW_START_BLOCK;
slice_size -= start_block;
slice_size = P2ALIGN(slice_size, PARTITION_END_ALIGNMENT);
vtoc->efi_parts[0].p_start = start_block;
vtoc->efi_parts[0].p_size = slice_size;
/*
* Why we use V_USR: V_BACKUP confuses users, and is considered
* disposable by some EFI utilities (since EFI doesn't have a backup
* slice). V_UNASSIGNED is supposed to be used only for zero size
* partitions, and efi_write() will fail if we use it. V_ROOT, V_BOOT,
* etc. were all pretty specific. V_USR is as close to reality as we
* can get, in the absence of V_OTHER.
*/
vtoc->efi_parts[0].p_tag = V_USR;
zpool_label_name(vtoc->efi_parts[0].p_name, EFI_PART_NAME_LEN);
vtoc->efi_parts[8].p_start = slice_size + start_block;
vtoc->efi_parts[8].p_size = resv;
vtoc->efi_parts[8].p_tag = V_RESERVED;
rval = efi_write(fd, vtoc);
/* Flush the buffers to disk and invalidate the page cache. */
(void) fsync(fd);
(void) ioctl(fd, BLKFLSBUF);
if (rval == 0)
rval = efi_rescan(fd);
/*
* Some block drivers (like pcata) may not support EFI GPT labels.
* Print out a helpful error message directing the user to manually
* label the disk and give a specific slice.
*/
if (rval != 0) {
(void) close(fd);
efi_free(vtoc);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "try using "
"parted(8) and then provide a specific slice: %d"), rval);
return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
}
(void) close(fd);
efi_free(vtoc);
(void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT, name);
(void) zfs_append_partition(path, MAXPATHLEN);
/* Wait to udev to signal use the device has settled. */
rval = zpool_label_disk_wait(path, DISK_LABEL_WAIT);
if (rval) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "failed to "
"detect device partitions on '%s': %d"), path, rval);
return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
}
/* We can't be to paranoid. Read the label back and verify it. */
(void) snprintf(path, sizeof (path), "%s/%s", DISK_ROOT, name);
rval = zpool_label_disk_check(path);
if (rval) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "freshly written "
"EFI label on '%s' is damaged. Ensure\nthis device "
"is not in use, and is functioning properly: %d"),
path, rval);
return (zfs_error(hdl, EZFS_LABELFAILED, errbuf));
}
return (0);
}

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#include <libzfs.h>
#include "libzfs_impl.h"
#ifndef F_SETPIPE_SZ
#define F_SETPIPE_SZ (F_SETLEASE + 7)
#endif /* F_SETPIPE_SZ */
#ifndef F_GETPIPE_SZ
#define F_GETPIPE_SZ (F_GETLEASE + 7)
#endif /* F_GETPIPE_SZ */
void
libzfs_set_pipe_max(int infd)
{
FILE *procf = fopen("/proc/sys/fs/pipe-max-size", "r");
if (procf != NULL) {
unsigned long max_psize;
long cur_psize;
if (fscanf(procf, "%lu", &max_psize) > 0) {
cur_psize = fcntl(infd, F_GETPIPE_SZ);
if (cur_psize > 0 &&
max_psize > (unsigned long) cur_psize)
fcntl(infd, F_SETPIPE_SZ,
max_psize);
}
fclose(procf);
}
}

184
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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#include <errno.h>
#include <fcntl.h>
#include <libintl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <math.h>
#include <sys/stat.h>
#include <sys/mnttab.h>
#include <sys/mntent.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <libzfs.h>
#include <libzfs_core.h>
#include "libzfs_impl.h"
#include "zfs_prop.h"
#include <libzutil.h>
#define ZDIFF_SHARESDIR "/.zfs/shares/"
int
zfs_ioctl(libzfs_handle_t *hdl, int request, zfs_cmd_t *zc)
{
return (ioctl(hdl->libzfs_fd, request, zc));
}
const char *
libzfs_error_init(int error)
{
switch (error) {
case ENXIO:
return (dgettext(TEXT_DOMAIN, "The ZFS modules are not "
"loaded.\nTry running '/sbin/modprobe zfs' as root "
"to load them."));
case ENOENT:
return (dgettext(TEXT_DOMAIN, "/dev/zfs and /proc/self/mounts "
"are required.\nTry running 'udevadm trigger' and 'mount "
"-t proc proc /proc' as root."));
case ENOEXEC:
return (dgettext(TEXT_DOMAIN, "The ZFS modules cannot be "
"auto-loaded.\nTry running '/sbin/modprobe zfs' as "
"root to manually load them."));
case EACCES:
return (dgettext(TEXT_DOMAIN, "Permission denied the "
"ZFS utilities must be run as root."));
default:
return (dgettext(TEXT_DOMAIN, "Failed to initialize the "
"libzfs library."));
}
}
static int
libzfs_module_loaded(const char *module)
{
const char path_prefix[] = "/sys/module/";
char path[256];
memcpy(path, path_prefix, sizeof (path_prefix) - 1);
strcpy(path + sizeof (path_prefix) - 1, module);
return (access(path, F_OK) == 0);
}
/*
* Verify the required ZFS_DEV device is available and optionally attempt
* to load the ZFS modules. Under normal circumstances the modules
* should already have been loaded by some external mechanism.
*
* Environment variables:
* - ZFS_MODULE_LOADING="YES|yes|ON|on" - Attempt to load modules.
* - ZFS_MODULE_TIMEOUT="<seconds>" - Seconds to wait for ZFS_DEV
*/
static int
libzfs_load_module_impl(const char *module)
{
char *argv[4] = {"/sbin/modprobe", "-q", (char *)module, (char *)0};
char *load_str, *timeout_str;
long timeout = 10; /* seconds */
long busy_timeout = 10; /* milliseconds */
int load = 0, fd;
hrtime_t start;
/* Optionally request module loading */
if (!libzfs_module_loaded(module)) {
load_str = getenv("ZFS_MODULE_LOADING");
if (load_str) {
if (!strncasecmp(load_str, "YES", strlen("YES")) ||
!strncasecmp(load_str, "ON", strlen("ON")))
load = 1;
else
load = 0;
}
if (load) {
if (libzfs_run_process("/sbin/modprobe", argv, 0))
return (ENOEXEC);
}
if (!libzfs_module_loaded(module))
return (ENXIO);
}
/*
* Device creation by udev is asynchronous and waiting may be
* required. Busy wait for 10ms and then fall back to polling every
* 10ms for the allowed timeout (default 10s, max 10m). This is
* done to optimize for the common case where the device is
* immediately available and to avoid penalizing the possible
* case where udev is slow or unable to create the device.
*/
timeout_str = getenv("ZFS_MODULE_TIMEOUT");
if (timeout_str) {
timeout = strtol(timeout_str, NULL, 0);
timeout = MAX(MIN(timeout, (10 * 60)), 0); /* 0 <= N <= 600 */
}
start = gethrtime();
do {
fd = open(ZFS_DEV, O_RDWR);
if (fd >= 0) {
(void) close(fd);
return (0);
} else if (errno != ENOENT) {
return (errno);
} else if (NSEC2MSEC(gethrtime() - start) < busy_timeout) {
sched_yield();
} else {
usleep(10 * MILLISEC);
}
} while (NSEC2MSEC(gethrtime() - start) < (timeout * MILLISEC));
return (ENOENT);
}
int
libzfs_load_module(void)
{
return (libzfs_load_module_impl(ZFS_DRIVER));
}
int
find_shares_object(differ_info_t *di)
{
char fullpath[MAXPATHLEN];
struct stat64 sb = { 0 };
(void) strlcpy(fullpath, di->dsmnt, MAXPATHLEN);
(void) strlcat(fullpath, ZDIFF_SHARESDIR, MAXPATHLEN);
if (stat64(fullpath, &sb) != 0) {
(void) snprintf(di->errbuf, sizeof (di->errbuf),
dgettext(TEXT_DOMAIN, "Cannot stat %s"), fullpath);
return (zfs_error(di->zhp->zfs_hdl, EZFS_DIFF, di->errbuf));
}
di->shares = (uint64_t)sb.st_ino;
return (0);
}