/* FUSE: Filesystem in Userspace Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> This program can be distributed under the terms of the GNU GPL. See the file COPYING. */ /* * This file defines the kernel interface of FUSE * * Protocol changelog: * * 7.9: * - new fuse_getattr_in input argument of GETATTR * - add lk_flags in fuse_lk_in * - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in * - add blksize field to fuse_attr * - add file flags field to fuse_read_in and fuse_write_in * * 7.10 * - add nonseekable open flag * * 7.11 * - add IOCTL message * - add unsolicited notification support * - add POLL message and NOTIFY_POLL notification * * 7.12 * - add umask flag to input argument of open, mknod and mkdir * - add notification messages for invalidation of inodes and * directory entries * * 7.13 * - make max number of background requests and congestion threshold * tunables */ #ifndef _LINUX_FUSE_H #define _LINUX_FUSE_H #include <linux/types.h> /* * Version negotiation: * * Both the kernel and userspace send the version they support in the * INIT request and reply respectively. * * If the major versions match then both shall use the smallest * of the two minor versions for communication. * * If the kernel supports a larger major version, then userspace shall * reply with the major version it supports, ignore the rest of the * INIT message and expect a new INIT message from the kernel with a * matching major version. * * If the library supports a larger major version, then it shall fall * back to the major protocol version sent by the kernel for * communication and reply with that major version (and an arbitrary * supported minor version). */ /** Version number of this interface */ #define FUSE_KERNEL_VERSION 7 /** Minor version number of this interface */ #define FUSE_KERNEL_MINOR_VERSION 13 /** The node ID of the root inode */ #define FUSE_ROOT_ID 1 /* Make sure all structures are padded to 64bit boundary, so 32bit userspace works under 64bit kernels */ struct fuse_attr { __u64 ino; __u64 size; __u64 blocks; __u64 atime; __u64 mtime; __u64 ctime; __u32 atimensec; __u32 mtimensec; __u32 ctimensec; __u32 mode; __u32 nlink; __u32 uid; __u32 gid; __u32 rdev; __u32 blksize; __u32 padding; }; struct fuse_kstatfs { __u64 blocks; __u64 bfree; __u64 bavail; __u64 files; __u64 ffree; __u32 bsize; __u32 namelen; __u32 frsize; __u32 padding; __u32 spare[6]; }; struct fuse_file_lock { __u64 start; __u64 end; __u32 type; __u32 pid; /* tgid */ }; /** * Bitmasks for fuse_setattr_in.valid */ #define FATTR_MODE (1 << 0) #define FATTR_UID (1 << 1) #define FATTR_GID (1 << 2) #define FATTR_SIZE (1 << 3) #define FATTR_ATIME (1 << 4) #define FATTR_MTIME (1 << 5) #define FATTR_FH (1 << 6) #define FATTR_ATIME_NOW (1 << 7) #define FATTR_MTIME_NOW (1 << 8) #define FATTR_LOCKOWNER (1 << 9) /** * Flags returned by the OPEN request * * FOPEN_DIRECT_IO: bypass page cache for this open file * FOPEN_KEEP_CACHE: don't invalidate the data cache on open * FOPEN_NONSEEKABLE: the file is not seekable */ #define FOPEN_DIRECT_IO (1 << 0) #define FOPEN_KEEP_CACHE (1 << 1) #define FOPEN_NONSEEKABLE (1 << 2) /** * INIT request/reply flags * * FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".." * FUSE_DONT_MASK: don't apply umask to file mode on create operations */ #define FUSE_ASYNC_READ (1 << 0) #define FUSE_POSIX_LOCKS (1 << 1) #define FUSE_FILE_OPS (1 << 2) #define FUSE_ATOMIC_O_TRUNC (1 << 3) #define FUSE_EXPORT_SUPPORT (1 << 4) #define FUSE_BIG_WRITES (1 << 5) #define FUSE_DONT_MASK (1 << 6) /** * CUSE INIT request/reply flags * * CUSE_UNRESTRICTED_IOCTL: use unrestricted ioctl */ #define CUSE_UNRESTRICTED_IOCTL (1 << 0) /** * Release flags */ #define FUSE_RELEASE_FLUSH (1 << 0) /** * Getattr flags */ #define FUSE_GETATTR_FH (1 << 0) /** * Lock flags */ #define FUSE_LK_FLOCK (1 << 0) /** * WRITE flags * * FUSE_WRITE_CACHE: delayed write from page cache, file handle is guessed * FUSE_WRITE_LOCKOWNER: lock_owner field is valid */ #define FUSE_WRITE_CACHE (1 << 0) #define FUSE_WRITE_LOCKOWNER (1 << 1) /** * Read flags */ #define FUSE_READ_LOCKOWNER (1 << 1) /** * Ioctl flags * * FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine * FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed * FUSE_IOCTL_RETRY: retry with new iovecs * * FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs */ #define FUSE_IOCTL_COMPAT (1 << 0) #define FUSE_IOCTL_UNRESTRICTED (1 << 1) #define FUSE_IOCTL_RETRY (1 << 2) #define FUSE_IOCTL_MAX_IOV 256 /** * Poll flags * * FUSE_POLL_SCHEDULE_NOTIFY: request poll notify */ #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0) enum fuse_opcode { FUSE_LOOKUP = 1, FUSE_FORGET = 2, /* no reply */ FUSE_GETATTR = 3, FUSE_SETATTR = 4, FUSE_READLINK = 5, FUSE_SYMLINK = 6, FUSE_MKNOD = 8, FUSE_MKDIR = 9, FUSE_UNLINK = 10, FUSE_RMDIR = 11, FUSE_RENAME = 12, FUSE_LINK = 13, FUSE_OPEN = 14, FUSE_READ = 15, FUSE_WRITE = 16, FUSE_STATFS = 17, FUSE_RELEASE = 18, FUSE_FSYNC = 20, FUSE_SETXATTR = 21, FUSE_GETXATTR = 22, FUSE_LISTXATTR = 23, FUSE_REMOVEXATTR = 24, FUSE_FLUSH = 25, FUSE_INIT = 26, FUSE_OPENDIR = 27, FUSE_READDIR = 28, FUSE_RELEASEDIR = 29, FUSE_FSYNCDIR = 30, FUSE_GETLK = 31, FUSE_SETLK = 32, FUSE_SETLKW = 33, FUSE_ACCESS = 34, FUSE_CREATE = 35, FUSE_INTERRUPT = 36, FUSE_BMAP = 37, FUSE_DESTROY = 38, FUSE_IOCTL = 39, FUSE_POLL = 40, /* CUSE specific operations */ CUSE_INIT = 4096, }; enum fuse_notify_code { FUSE_NOTIFY_POLL = 1, FUSE_NOTIFY_INVAL_INODE = 2, FUSE_NOTIFY_INVAL_ENTRY = 3, FUSE_NOTIFY_CODE_MAX, }; /* The read buffer is required to be at least 8k, but may be much larger */ #define FUSE_MIN_READ_BUFFER 8192 #define FUSE_COMPAT_ENTRY_OUT_SIZE 120 struct fuse_entry_out { __u64 nodeid; /* Inode ID */ __u64 generation; /* Inode generation: nodeid:gen must be unique for the fs's lifetime */ __u64 entry_valid; /* Cache timeout for the name */ __u64 attr_valid; /* Cache timeout for the attributes */ __u32 entry_valid_nsec; __u32 attr_valid_nsec; struct fuse_attr attr; }; struct fuse_forget_in { __u64 nlookup; }; struct fuse_getattr_in { __u32 getattr_flags; __u32 dummy; __u64 fh; }; #define FUSE_COMPAT_ATTR_OUT_SIZE 96 struct fuse_attr_out { __u64 attr_valid; /* Cache timeout for the attributes */ __u32 attr_valid_nsec; __u32 dummy; struct fuse_attr attr; }; #define FUSE_COMPAT_MKNOD_IN_SIZE 8 struct fuse_mknod_in { __u32 mode; __u32 rdev; __u32 umask; __u32 padding; }; struct fuse_mkdir_in { __u32 mode; __u32 umask; }; struct fuse_rename_in { __u64 newdir; }; struct fuse_link_in { __u64 oldnodeid; }; struct fuse_setattr_in { __u32 valid; __u32 padding; __u64 fh; __u64 size; __u64 lock_owner; __u64 atime; __u64 mtime; __u64 unused2; __u32 atimensec; __u32 mtimensec; __u32 unused3; __u32 mode; __u32 unused4; __u32 uid; __u32 gid; __u32 unused5; }; struct fuse_open_in { __u32 flags; __u32 unused; }; struct fuse_create_in { __u32 flags; __u32 mode; __u32 umask; __u32 padding; }; struct fuse_open_out { __u64 fh; __u32 open_flags; __u32 padding; }; struct fuse_release_in { __u64 fh; __u32 flags; __u32 release_flags; __u64 lock_owner; }; struct fuse_flush_in { __u64 fh; __u32 unused; __u32 padding; __u64 lock_owner; }; struct fuse_read_in { __u64 fh; __u64 offset; __u32 size; __u32 read_flags; __u64 lock_owner; __u32 flags; __u32 padding; }; #define FUSE_COMPAT_WRITE_IN_SIZE 24 struct fuse_write_in { __u64 fh; __u64 offset; __u32 size; __u32 write_flags; __u64 lock_owner; __u32 flags; __u32 padding; }; struct fuse_write_out { __u32 size; __u32 padding; }; #define FUSE_COMPAT_STATFS_SIZE 48 struct fuse_statfs_out { struct fuse_kstatfs st; }; struct fuse_fsync_in { __u64 fh; __u32 fsync_flags; __u32 padding; }; struct fuse_setxattr_in { __u32 size; __u32 flags; }; struct fuse_getxattr_in { __u32 size; __u32 padding; }; struct fuse_getxattr_out { __u32 size; __u32 padding; }; struct fuse_lk_in { __u64 fh; __u64 owner; struct fuse_file_lock lk; __u32 lk_flags; __u32 padding; }; struct fuse_lk_out { struct fuse_file_lock lk; }; struct fuse_access_in { __u32 mask; __u32 padding; }; struct fuse_init_in { __u32 major; __u32 minor; __u32 max_readahead; __u32 flags; }; struct fuse_init_out { __u32 major; __u32 minor; __u32 max_readahead; __u32 flags; __u16 max_background; __u16 congestion_threshold; __u32 max_write; }; #define CUSE_INIT_INFO_MAX 4096 struct cuse_init_in { __u32 major; __u32 minor; __u32 unused; __u32 flags; }; struct cuse_init_out { __u32 major; __u32 minor; __u32 unused; __u32 flags; __u32 max_read; __u32 max_write; __u32 dev_major; /* chardev major */ __u32 dev_minor; /* chardev minor */ __u32 spare[10]; }; struct fuse_interrupt_in { __u64 unique; }; struct fuse_bmap_in { __u64 block; __u32 blocksize; __u32 padding; }; struct fuse_bmap_out { __u64 block; }; struct fuse_ioctl_in { __u64 fh; __u32 flags; __u32 cmd; __u64 arg; __u32 in_size; __u32 out_size; }; struct fuse_ioctl_out { __s32 result; __u32 flags; __u32 in_iovs; __u32 out_iovs; }; struct fuse_poll_in { __u64 fh; __u64 kh; __u32 flags; __u32 padding; }; struct fuse_poll_out { __u32 revents; __u32 padding; }; struct fuse_notify_poll_wakeup_out { __u64 kh; }; struct fuse_in_header { __u32 len; __u32 opcode; __u64 unique; __u64 nodeid; __u32 uid; __u32 gid; __u32 pid; __u32 padding; }; struct fuse_out_header { __u32 len; __s32 error; __u64 unique; }; struct fuse_dirent { __u64 ino; __u64 off; __u32 namelen; __u32 type; char name[0]; }; #define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name) #define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1)) #define FUSE_DIRENT_SIZE(d) \ FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen) struct fuse_notify_inval_inode_out { __u64 ino; __s64 off; __s64 len; }; struct fuse_notify_inval_entry_out { __u64 parent; __u32 namelen; __u32 padding; }; #endif /* _LINUX_FUSE_H */