p2k(3) - NetBSD Manual Pages

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P2K(3)                  NetBSD Library Functions Manual                 P2K(3)

p2k -- puffs to kernel vfs translation library
p2k Library (libp2k, -lp2k)
#include <rump/p2k.h> struct p2k_mount * p2k_init(uint32_t puffs_flags); void p2k_cancel(struct p2k_mount *p2m, int error); int p2k_setup_fs(struct p2k_mount *p2m, const char *vfsname, const char *devpath, const char *mountpath, int mntflags, void *arg, size_t alen); p2k_setup_diskfs(struct p2k_mount *p2m, const char *vfsname, const char *devpath, int partition, const char *mountpath, int mntflags, void *arg, size_t alen); int p2k_mainloop(struct p2k_mount *p2m); int p2k_run_fs(const char *vfsname, const char *devpath, const char *mountpath, int mntflags, void *arg, size_t alen, uint32_t puffs_flags); int p2k_run_diskfs(const char *vfsname, const char *devpath, int partition, const char *mountpath, int mntflags, void *arg, size_t alen, uint32_t puffs_flags);
The p2k library translates the puffs protocol to the kernel vfs(9) proto- col and back again. It can therefore be used to mount and run kernel file system code as a userspace daemon. Calling the library interface function mounts the file system and, if succesful, starts handling requests. The parameters are handled by ukfs_mount() (see ukfs(3)), with the exception that mountpath and puffs_flags are handled by puffs(3). The "run_fs" variants of the inter- faces are provided as a convenience for the common case. They execute all of init, setup and mainloop in one call.
The following environment variables affect the behaviour of p2k. They are useful mostly for debugging purposes. The flags are environment variables because typically the command line arguments to p2k utilities are parsed using versions not aware of p2k options; for example, the rump_cd9660(8) arguments are really parsed by mount_cd9660(8). P2K_DEBUG Do not detach from tty and print information about each puffs operation. In case the daemon receives SIGINFO (typically from ctrl-T), it dumps out the status of the mount point. Sending SIGUSR1 causes a dump of all the vnodes (verbose). P2K_NODETACH Do not detach from tty. P2K_NOCACHE_PAGE Do not use the puffs page cache. P2K_NOCACHE_NAME Do not use the puffs name cache. P2K_NOCACHE Do not use the puffs page or name cache. P2K_WIZARDUID If set, use the value of the variable to determine the UID of the caller of each operation instead of the actual caller supplied by puffs(3). This can be used for example to simplify modifying an OS instal- lation's root image as a non-root user.
puffs(3), rump(3), ukfs(3), rump_cd9660(8), rump_efs(8), rump_ext2fs(8), rump_ffs(8), rump_hfs(8), rump_lfs(8), rump_msdos(8), rump_nfs(8), rump_ntfs(8), rump_smbfs(8), rump_syspuffs(8), rump_sysvbfs(8), rump_tmpfs(8), rump_udf(8) NetBSD 9.0 January 7, 2011 NetBSD 9.0
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