void
VLockPartition_r(char *name)
{
struct DiskPartition64 *dp = VGetPartition_r(name, 0);
OVERLAPPED lap;
if (!dp)
return;
if (dp->lock_fd == INVALID_FD) {
char path[64];
int rc;
(void)sprintf(path, "%s\\%s", VPartitionPath(dp), LOCKFILE);
dp->lock_fd =
(FD_t)CreateFile(path, GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_HIDDEN, NULL);
opr_Assert(dp->lock_fd != INVALID_FD);
memset(&lap, 0, sizeof(lap));
rc = LockFileEx((HANDLE) dp->lock_fd, LOCKFILE_EXCLUSIVE_LOCK, 0, 1,
0, &lap);
opr_Assert(rc);
}
}
void
VLockPartition_r(char *name)
{
register struct DiskPartition64 *dp = VGetPartition_r(name, 0);
char *partitionName;
int retries, code;
struct timeval pausing;
#if defined(AFS_HPUX_ENV)
int lockfRtn;
struct privgrp_map privGrpList[PRIV_MAXGRPS];
unsigned int *globalMask;
int globalMaskIndex;
#endif /* defined(AFS_HPUX_ENV) */
#if defined(AFS_DARWIN_ENV)
char lockfile[MAXPATHLEN];
#endif /* defined(AFS_DARWIN_ENV) */
#ifdef AFS_NAMEI_ENV
#ifdef AFS_AIX42_ENV
char LockFileName[MAXPATHLEN + 1];
sprintf((char *)&LockFileName, "%s/AFSINODE_FSLock", name);
partitionName = (char *)&LockFileName;
#endif
#endif
if (!dp)
return; /* no partition, will fail later */
if (dp->lock_fd != -1)
return;
#if defined(AFS_SUN5_ENV) || defined(AFS_AIX41_ENV)
#if !defined(AFS_AIX42_ENV) || !defined(AFS_NAMEI_ENV)
partitionName = dp->devName;
#endif
code = O_RDWR;
#elif defined(AFS_DARWIN_ENV)
strlcpy((partitionName = lockfile), dp->name, sizeof(lockfile));
strlcat(lockfile, "/.lock.afs", sizeof(lockfile));
code = O_RDONLY | O_CREAT;
#else
partitionName = dp->name;
code = O_RDONLY;
#endif
for (retries = 25; retries; retries--) {
dp->lock_fd = afs_open(partitionName, code);
if (dp->lock_fd != -1)
break;
if (errno == ENOENT)
code |= O_CREAT;
pausing.tv_sec = 0;
pausing.tv_usec = 500000;
select(0, NULL, NULL, NULL, &pausing);
}
assert(retries != 0);
#if defined (AFS_HPUX_ENV)
assert(getprivgrp(privGrpList) == 0);
/*
* In general, it will difficult and time-consuming ,if not impossible,
* to try to find the privgroup to which this process belongs that has the
* smallest membership, to minimise the security hole. So, we use the privgrp
* to which everybody belongs.
*/
/* first, we have to find the global mask */
for (globalMaskIndex = 0; globalMaskIndex < PRIV_MAXGRPS;
globalMaskIndex++) {
if (privGrpList[globalMaskIndex].priv_groupno == PRIV_GLOBAL) {
globalMask =
&(privGrpList[globalMaskIndex].priv_mask[LOCKRDONLY_OFFSET]);
break;
}
}
if (((*globalMask) & privmask(PRIV_LOCKRDONLY)) == 0) {
/* allow everybody to set a lock on a read-only file descriptor */
(*globalMask) |= privmask(PRIV_LOCKRDONLY);
assert(setprivgrp(PRIV_GLOBAL, privGrpList[globalMaskIndex].priv_mask)
== 0);
lockfRtn = lockf(dp->lock_fd, F_LOCK, 0);
/* remove the privilege granted to everybody to lock a read-only fd */
(*globalMask) &= ~(privmask(PRIV_LOCKRDONLY));
assert(setprivgrp(PRIV_GLOBAL, privGrpList[globalMaskIndex].priv_mask)
== 0);
} else {
/* in this case, we should be able to do this with impunity, anyway */
lockfRtn = lockf(dp->lock_fd, F_LOCK, 0);
}
assert(lockfRtn != -1);
#else
#if defined(AFS_AIX_ENV) || defined(AFS_SUN5_ENV)
assert(lockf(dp->lock_fd, F_LOCK, 0) != -1);
#else
assert(flock(dp->lock_fd, LOCK_EX) == 0);
#endif /* defined(AFS_AIX_ENV) || defined(AFS_SUN5_ENV) */
#endif
}
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));
}