/*
* Calculate the pfs_id given a path to a directory or a @@PFS or @@%llx:%d
* softlink.
*/
int
getpfs(struct hammer_ioc_pseudofs_rw *pfs, char *path)
{
int fd;
char *p;
bzero(pfs, sizeof(*pfs));
pfs->ondisk = malloc(sizeof(*pfs->ondisk));
bzero(pfs->ondisk, sizeof(*pfs->ondisk));
pfs->bytes = sizeof(*pfs->ondisk);
/*
* Trailing '/' must be removed so that upon pfs-destroy
* the symlink can be deleted without problems.
* Root directory (/) must be excluded from this.
*/
p = path + (int)strlen(path) - 1;
assert(p >= path);
while (p != path && *p == '/')
*p-- = 0;
fd = scanpfsid(pfs, path);
if (fd < 0) {
/*
* Once it comes here the hammer command may fail even if
* this function returns valid file descriptor.
*/
fd = open(path, O_RDONLY);
if (fd >= 0) {
pfs->pfs_id = -1;
ioctl(fd, HAMMERIOC_GET_PSEUDOFS, pfs);
if (pfs->pfs_id == -1) {
close(fd);
fd = -1;
}
}
}
if (fd < 0) {
fprintf(stderr, "Cannot access PFS %s: %s\n",
path, strerror(errno));
exit(1);
}
/*
* pfs.pfs_id should have been set to non -1. In this case fd
* could be any fd of HAMMER inodes since HAMMERIOC_GET_PSEUDOFS
* doesn't depend on inode attributes if it's set to a valid id.
*/
if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, pfs) < 0) {
fprintf(stderr, "Cannot access PFS %s: %s\n",
path, strerror(errno));
exit(1);
}
return(fd);
}
/*
* Calculate the PFS id given a path to a file/directory or
* a @@%llx:%d softlink.
*/
int
getpfs(struct hammer_ioc_pseudofs_rw *pfs, const char *path)
{
int fd;
clrpfs(pfs, NULL, -1);
/*
* Extract the PFS id.
* dirname(path) is supposed to be a directory in PFS#0.
*/
if (scanpfsid(pfs, path) == 0) {
path = dirname(path); /* strips trailing / first if any */
}
/*
* Open the path regardless of scanpfsid() result, since some
* commands can take a regular file/directory (e.g. pfs-status).
*/
fd = open(path, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Failed to open %s\n", path);
exit(1);
}
/*
* If pfs.pfs_id has been set to non -1, the file descriptor fd
* could be any fd of HAMMER inodes since HAMMERIOC_GET_PSEUDOFS
* doesn't depend on inode attributes if it's set to a valid id.
*/
if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, pfs) < 0) {
fprintf(stderr, "Cannot access %s: %s\n",
path, strerror(errno));
exit(1);
}
return(fd);
}