Пример #1
0
void
VLockPartition(char *name)
{
    VOL_LOCK;
    VLockPartition_r(name);
    VOL_UNLOCK;
}
Пример #2
0
Volume *
VCreateVolume_r(Error * ec, char *partname, VolumeId volumeId, VolumeId parentId)
{				/* Should be the same as volumeId if there is
				 * no parent */
    VolumeDiskData vol;
    int i, rc;
    char headerName[VMAXPATHLEN], volumePath[VMAXPATHLEN];
    Device device;
    struct DiskPartition64 *partition;
    struct VolumeDiskHeader diskHeader;
    IHandle_t *handle;
    FdHandle_t *fdP;
    Inode nearInode AFS_UNUSED = 0;
    char *part, *name;
    struct stat st;
    struct VolumeHeader tempHeader;
    struct afs_inode_info stuff[MAXINODETYPE];
    afs_ino_str_t stmp;
# ifdef AFS_DEMAND_ATTACH_FS
    int locktype = 0;
# endif /* AFS_DEMAND_ATTACH_FS */

    init_inode_info(&tempHeader, stuff);

    *ec = 0;
    memset(&vol, 0, sizeof(vol));
    vol.id = volumeId;
    vol.parentId = parentId;
    vol.copyDate = time(0);	/* The only date which really means when this
				 * @i(instance) of this volume was created.
				 * Creation date does not mean this */

    /* Initialize handle for error case below. */
    handle = NULL;

    /* Verify that the parition is valid before writing to it. */
    if (!(partition = VGetPartition_r(partname, 0))) {
	Log("VCreateVolume: partition %s is not in service.\n", partname);
	*ec = VNOVOL;
	return NULL;
    }
#if	defined(NEARINODE_HINT)
    nearInodeHash(volumeId, nearInode);
    nearInode %= partition->f_files;
#endif
    VGetVolumePath(ec, vol.id, &part, &name);
    if (*ec == VNOVOL || !strcmp(partition->name, part)) {
	/* this case is ok */
    } else {
	/* return EXDEV if it's a clone to an alternate partition
	 * otherwise assume it's a move */
	if (vol.parentId != vol.id) {
	    *ec = EXDEV;
	    return NULL;
	}
    }
    *ec = 0;

# ifdef AFS_DEMAND_ATTACH_FS
    /* volume doesn't exist yet, but we must lock it to try to prevent something
     * else from reading it when we're e.g. half way through creating it (or
     * something tries to create the same volume at the same time) */
    locktype = VVolLockType(V_VOLUPD, 1);
    rc = VLockVolumeByIdNB(volumeId, partition, locktype);
    if (rc) {
	Log("VCreateVolume: vol %lu already locked by someone else\n",
	    afs_printable_uint32_lu(volumeId));
	*ec = VNOVOL;
	return NULL;
    }
# else /* AFS_DEMAND_ATTACH_FS */
    VLockPartition_r(partname);
# endif /* !AFS_DEMAND_ATTACH_FS */

    memset(&tempHeader, 0, sizeof(tempHeader));
    tempHeader.stamp.magic = VOLUMEHEADERMAGIC;
    tempHeader.stamp.version = VOLUMEHEADERVERSION;
    tempHeader.id = vol.id;
    tempHeader.parent = vol.parentId;
    vol.stamp.magic = VOLUMEINFOMAGIC;
    vol.stamp.version = VOLUMEINFOVERSION;
    vol.destroyMe = DESTROY_ME;
    snprintf(headerName, sizeof headerName, VFORMAT,
	     afs_printable_VolumeId_lu(vol.id));
    snprintf(volumePath, sizeof volumePath, "%s" OS_DIRSEP "%s",
	     VPartitionPath(partition), headerName);
    rc = stat(volumePath, &st);
    if (rc == 0 || errno != ENOENT) {
	if (rc == 0) {
	    Log("VCreateVolume: Header file %s already exists!\n",
		volumePath);
	    *ec = VVOLEXISTS;
	} else {
	    Log("VCreateVolume: Error %d trying to stat header file %s\n",
	        errno, volumePath);
	    *ec = VNOVOL;
	}
	goto bad_noheader;
    }
    device = partition->device;

    for (i = 0; i < MAXINODETYPE; i++) {
	struct afs_inode_info *p = &stuff[i];
	if (p->obsolete)
	    continue;
#ifdef AFS_NAMEI_ENV
	*(p->inode) =
	    IH_CREATE(NULL, device, VPartitionPath(partition), nearInode,
		      (p->inodeType == VI_LINKTABLE) ? vol.parentId : vol.id,
		      INODESPECIAL, p->inodeType, vol.parentId);
	if (!(VALID_INO(*(p->inode)))) {
	    if (errno == EEXIST && (p->inodeType == VI_LINKTABLE)) {
		/* Increment the reference count instead. */
		IHandle_t *lh;
		int code;

		*(p->inode) = namei_MakeSpecIno(vol.parentId, VI_LINKTABLE);
		IH_INIT(lh, device, parentId, *(p->inode));
		fdP = IH_OPEN(lh);
		if (fdP == NULL) {
		    IH_RELEASE(lh);
		    goto bad;
		}
		code = IH_INC(lh, *(p->inode), parentId);
		FDH_REALLYCLOSE(fdP);
		IH_RELEASE(lh);
		if (code < 0)
		    goto bad;
		continue;
	    }
	}
#else
	*(p->inode) =
	    IH_CREATE(NULL, device, VPartitionPath(partition), nearInode,
		      vol.id, INODESPECIAL, p->inodeType, vol.parentId);
#endif

	if (!VALID_INO(*(p->inode))) {
	    Log("VCreateVolume:  Problem creating %s file associated with volume header %s\n", p->description, volumePath);
	  bad:
	    if (handle)
		IH_RELEASE(handle);
	    RemoveInodes(stuff, device, vol.parentId, vol.id);
	    if (!*ec) {
		*ec = VNOVOL;
	    }
	    VDestroyVolumeDiskHeader(partition, volumeId, parentId);
	  bad_noheader:
# ifdef AFS_DEMAND_ATTACH_FS
	    if (locktype) {
		VUnlockVolumeById(volumeId, partition);
	    }
# endif /* AFS_DEMAND_ATTACH_FS */
	    return NULL;
	}
	IH_INIT(handle, device, vol.parentId, *(p->inode));
	fdP = IH_OPEN(handle);
	if (fdP == NULL) {
	    Log("VCreateVolume:  Problem iopen inode %s (err=%d)\n",
		PrintInode(stmp, *(p->inode)), errno);
	    goto bad;
	}
	if (FDH_PWRITE(fdP, (char *)&p->stamp, sizeof(p->stamp), 0) !=
	    sizeof(p->stamp)) {
	    Log("VCreateVolume:  Problem writing to inode %s (err=%d)\n",
		PrintInode(stmp, *(p->inode)), errno);
	    FDH_REALLYCLOSE(fdP);
	    goto bad;
	}
	FDH_REALLYCLOSE(fdP);
	IH_RELEASE(handle);
	nearInode = *(p->inode);
    }

    IH_INIT(handle, device, vol.parentId, tempHeader.volumeInfo);
    fdP = IH_OPEN(handle);
    if (fdP == NULL) {
	Log("VCreateVolume:  Problem iopen inode %s (err=%d)\n",
	    PrintInode(stmp, tempHeader.volumeInfo), errno);
	goto bad;
    }
    if (FDH_PWRITE(fdP, (char *)&vol, sizeof(vol), 0) != sizeof(vol)) {
	Log("VCreateVolume:  Problem writing to  inode %s (err=%d)\n",
	    PrintInode(stmp, tempHeader.volumeInfo), errno);
	FDH_REALLYCLOSE(fdP);
	goto bad;
    }
    FDH_CLOSE(fdP);
    IH_RELEASE(handle);

    VolumeHeaderToDisk(&diskHeader, &tempHeader);
    rc = VCreateVolumeDiskHeader(&diskHeader, partition);
    if (rc) {
	Log("VCreateVolume: Error %d trying to write volume header for "
	    "volume %" AFS_VOLID_FMT " on partition %s; volume not created\n", rc,
	    afs_printable_VolumeId_lu(vol.id), VPartitionPath(partition));
	if (rc == EEXIST) {
	    *ec = VVOLEXISTS;
	}
	goto bad;
    }

# ifdef AFS_DEMAND_ATTACH_FS
    if (locktype) {
	VUnlockVolumeById(volumeId, partition);
    }
# endif /* AFS_DEMAND_ATTACH_FS */
    return (VAttachVolumeByName_r(ec, partname, headerName, V_SECRETLY));
}