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Add support for FUSE passthrough
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412 changed files with 43707 additions and 17432 deletions
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@ -211,6 +211,24 @@
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* 7.39
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* - add FUSE_DIRECT_IO_ALLOW_MMAP
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* - add FUSE_STATX and related structures
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*
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* 7.40
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* - add max_stack_depth to fuse_init_out, add FUSE_PASSTHROUGH init flag
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* - add backing_id to fuse_open_out, add FOPEN_PASSTHROUGH open flag
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* - add FUSE_NO_EXPORT_SUPPORT init flag
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* - add FUSE_NOTIFY_RESEND, add FUSE_HAS_RESEND init flag
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*
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* 7.41
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* - add FUSE_ALLOW_IDMAP
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* 7.42
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* - Add FUSE_OVER_IO_URING and all other io-uring related flags and data
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* structures:
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* - struct fuse_uring_ent_in_out
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* - struct fuse_uring_req_header
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* - struct fuse_uring_cmd_req
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* - FUSE_URING_IN_OUT_HEADER_SZ
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* - FUSE_URING_OP_IN_OUT_SZ
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* - enum fuse_uring_cmd
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*/
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#ifndef _LINUX_FUSE_H
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@ -246,7 +264,7 @@
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#define FUSE_KERNEL_VERSION 7
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/** Minor version number of this interface */
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#define FUSE_KERNEL_MINOR_VERSION 39
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#define FUSE_KERNEL_MINOR_VERSION 42
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/** The node ID of the root inode */
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#define FUSE_ROOT_ID 1
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@ -353,6 +371,7 @@ struct fuse_file_lock {
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* FOPEN_STREAM: the file is stream-like (no file position at all)
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* FOPEN_NOFLUSH: don't flush data cache on close (unless FUSE_WRITEBACK_CACHE)
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* FOPEN_PARALLEL_DIRECT_WRITES: Allow concurrent direct writes on the same inode
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* FOPEN_PASSTHROUGH: passthrough read/write io for this open file
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*/
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#define FOPEN_DIRECT_IO (1 << 0)
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#define FOPEN_KEEP_CACHE (1 << 1)
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@ -361,6 +380,7 @@ struct fuse_file_lock {
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#define FOPEN_STREAM (1 << 4)
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#define FOPEN_NOFLUSH (1 << 5)
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#define FOPEN_PARALLEL_DIRECT_WRITES (1 << 6)
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#define FOPEN_PASSTHROUGH (1 << 7)
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/**
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* INIT request/reply flags
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@ -410,38 +430,43 @@ struct fuse_file_lock {
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* symlink and mknod (single group that matches parent)
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* FUSE_HAS_EXPIRE_ONLY: kernel supports expiry-only entry invalidation
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* FUSE_DIRECT_IO_ALLOW_MMAP: allow shared mmap in FOPEN_DIRECT_IO mode.
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* FUSE_NO_EXPORT_SUPPORT: explicitly disable export support
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* FUSE_HAS_RESEND: kernel supports resending pending requests, and the high bit
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* of the request ID indicates resend requests
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* FUSE_ALLOW_IDMAP: allow creation of idmapped mounts
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* FUSE_OVER_IO_URING: Indicate that client supports io-uring
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*/
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#define FUSE_ASYNC_READ (1 << 0)
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#define FUSE_POSIX_LOCKS (1 << 1)
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#define FUSE_FILE_OPS (1 << 2)
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#define FUSE_ATOMIC_O_TRUNC (1 << 3)
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#define FUSE_EXPORT_SUPPORT (1 << 4)
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#define FUSE_BIG_WRITES (1 << 5)
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#define FUSE_DONT_MASK (1 << 6)
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#define FUSE_SPLICE_WRITE (1 << 7)
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#define FUSE_SPLICE_MOVE (1 << 8)
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#define FUSE_SPLICE_READ (1 << 9)
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#define FUSE_FLOCK_LOCKS (1 << 10)
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#define FUSE_HAS_IOCTL_DIR (1 << 11)
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#define FUSE_AUTO_INVAL_DATA (1 << 12)
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#define FUSE_DO_READDIRPLUS (1 << 13)
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#define FUSE_READDIRPLUS_AUTO (1 << 14)
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#define FUSE_ASYNC_DIO (1 << 15)
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#define FUSE_WRITEBACK_CACHE (1 << 16)
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#define FUSE_NO_OPEN_SUPPORT (1 << 17)
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#define FUSE_PARALLEL_DIROPS (1 << 18)
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#define FUSE_HANDLE_KILLPRIV (1 << 19)
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#define FUSE_POSIX_ACL (1 << 20)
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#define FUSE_ABORT_ERROR (1 << 21)
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#define FUSE_MAX_PAGES (1 << 22)
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#define FUSE_CACHE_SYMLINKS (1 << 23)
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#define FUSE_NO_OPENDIR_SUPPORT (1 << 24)
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#define FUSE_EXPLICIT_INVAL_DATA (1 << 25)
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#define FUSE_MAP_ALIGNMENT (1 << 26)
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#define FUSE_SUBMOUNTS (1 << 27)
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#define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
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#define FUSE_SETXATTR_EXT (1 << 29)
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#define FUSE_INIT_EXT (1 << 30)
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#define FUSE_ASYNC_READ (1ULL << 0)
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#define FUSE_POSIX_LOCKS (1ULL << 1)
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#define FUSE_FILE_OPS (1ULL << 2)
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#define FUSE_ATOMIC_O_TRUNC (1ULL << 3)
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#define FUSE_EXPORT_SUPPORT (1ULL << 4)
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#define FUSE_BIG_WRITES (1ULL << 5)
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#define FUSE_DONT_MASK (1ULL << 6)
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#define FUSE_SPLICE_WRITE (1ULL << 7)
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#define FUSE_SPLICE_MOVE (1ULL << 8)
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#define FUSE_SPLICE_READ (1ULL << 9)
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#define FUSE_FLOCK_LOCKS (1ULL << 10)
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#define FUSE_HAS_IOCTL_DIR (1ULL << 11)
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#define FUSE_AUTO_INVAL_DATA (1ULL << 12)
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#define FUSE_DO_READDIRPLUS (1ULL << 13)
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#define FUSE_READDIRPLUS_AUTO (1ULL << 14)
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#define FUSE_ASYNC_DIO (1ULL << 15)
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#define FUSE_WRITEBACK_CACHE (1ULL << 16)
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#define FUSE_NO_OPEN_SUPPORT (1ULL << 17)
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#define FUSE_PARALLEL_DIROPS (1ULL << 18)
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#define FUSE_HANDLE_KILLPRIV (1ULL << 19)
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#define FUSE_POSIX_ACL (1ULL << 20)
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#define FUSE_ABORT_ERROR (1ULL << 21)
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#define FUSE_MAX_PAGES (1ULL << 22)
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#define FUSE_CACHE_SYMLINKS (1ULL << 23)
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#define FUSE_NO_OPENDIR_SUPPORT (1ULL << 24)
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#define FUSE_EXPLICIT_INVAL_DATA (1ULL << 25)
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#define FUSE_MAP_ALIGNMENT (1ULL << 26)
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#define FUSE_SUBMOUNTS (1ULL << 27)
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#define FUSE_HANDLE_KILLPRIV_V2 (1ULL << 28)
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#define FUSE_SETXATTR_EXT (1ULL << 29)
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#define FUSE_INIT_EXT (1ULL << 30)
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#define FUSE_INIT_RESERVED (1ULL << 31)
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/* bits 32..63 get shifted down 32 bits into the flags2 field */
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#define FUSE_SECURITY_CTX (1ULL << 32)
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@ -449,9 +474,14 @@ struct fuse_file_lock {
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#define FUSE_CREATE_SUPP_GROUP (1ULL << 34)
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#define FUSE_HAS_EXPIRE_ONLY (1ULL << 35)
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#define FUSE_DIRECT_IO_ALLOW_MMAP (1ULL << 36)
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#define FUSE_PASSTHROUGH (1ULL << 37)
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#define FUSE_NO_EXPORT_SUPPORT (1ULL << 38)
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#define FUSE_HAS_RESEND (1ULL << 39)
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/* Obsolete alias for FUSE_DIRECT_IO_ALLOW_MMAP */
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#define FUSE_DIRECT_IO_RELAX FUSE_DIRECT_IO_ALLOW_MMAP
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#define FUSE_ALLOW_IDMAP (1ULL << 40)
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#define FUSE_OVER_IO_URING (1ULL << 41)
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/**
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* CUSE INIT request/reply flags
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@ -635,6 +665,7 @@ enum fuse_notify_code {
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FUSE_NOTIFY_STORE = 4,
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FUSE_NOTIFY_RETRIEVE = 5,
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FUSE_NOTIFY_DELETE = 6,
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FUSE_NOTIFY_RESEND = 7,
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FUSE_NOTIFY_CODE_MAX,
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};
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@ -761,7 +792,7 @@ struct fuse_create_in {
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struct fuse_open_out {
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uint64_t fh;
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uint32_t open_flags;
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uint32_t padding;
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int32_t backing_id;
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};
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struct fuse_release_in {
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@ -877,7 +908,8 @@ struct fuse_init_out {
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uint16_t max_pages;
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uint16_t map_alignment;
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uint32_t flags2;
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uint32_t unused[7];
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uint32_t max_stack_depth;
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uint32_t unused[6];
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};
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#define CUSE_INIT_INFO_MAX 4096
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@ -960,6 +992,29 @@ struct fuse_fallocate_in {
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uint32_t padding;
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};
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/**
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* FUSE request unique ID flag
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*
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* Indicates whether this is a resend request. The receiver should handle this
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* request accordingly.
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*/
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#define FUSE_UNIQUE_RESEND (1ULL << 63)
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/**
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* This value will be set by the kernel to
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* (struct fuse_in_header).{uid,gid} fields in
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* case when:
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* - fuse daemon enabled FUSE_ALLOW_IDMAP
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* - idmapping information is not available and uid/gid
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* can not be mapped in accordance with an idmapping.
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*
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* Note: an idmapping information always available
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* for inode creation operations like:
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* FUSE_MKNOD, FUSE_SYMLINK, FUSE_MKDIR, FUSE_TMPFILE,
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* FUSE_CREATE and FUSE_RENAME2 (with RENAME_WHITEOUT).
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*/
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#define FUSE_INVALID_UIDGID ((uint32_t)(-1))
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struct fuse_in_header {
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uint32_t len;
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uint32_t opcode;
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@ -1049,9 +1104,18 @@ struct fuse_notify_retrieve_in {
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uint64_t dummy4;
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};
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struct fuse_backing_map {
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int32_t fd;
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uint32_t flags;
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uint64_t padding;
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};
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/* Device ioctls: */
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#define FUSE_DEV_IOC_MAGIC 229
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#define FUSE_DEV_IOC_CLONE _IOR(FUSE_DEV_IOC_MAGIC, 0, uint32_t)
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#define FUSE_DEV_IOC_BACKING_OPEN _IOW(FUSE_DEV_IOC_MAGIC, 1, \
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struct fuse_backing_map)
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#define FUSE_DEV_IOC_BACKING_CLOSE _IOW(FUSE_DEV_IOC_MAGIC, 2, uint32_t)
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struct fuse_lseek_in {
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uint64_t fh;
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@ -1153,4 +1217,67 @@ struct fuse_supp_groups {
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uint32_t groups[];
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};
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/**
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* Size of the ring buffer header
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*/
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#define FUSE_URING_IN_OUT_HEADER_SZ 128
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#define FUSE_URING_OP_IN_OUT_SZ 128
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/* Used as part of the fuse_uring_req_header */
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struct fuse_uring_ent_in_out {
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uint64_t flags;
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/*
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* commit ID to be used in a reply to a ring request (see also
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* struct fuse_uring_cmd_req)
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*/
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uint64_t commit_id;
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/* size of user payload buffer */
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uint32_t payload_sz;
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uint32_t padding;
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uint64_t reserved;
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};
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/**
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* Header for all fuse-io-uring requests
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*/
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struct fuse_uring_req_header {
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/* struct fuse_in_header / struct fuse_out_header */
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char in_out[FUSE_URING_IN_OUT_HEADER_SZ];
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/* per op code header */
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char op_in[FUSE_URING_OP_IN_OUT_SZ];
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struct fuse_uring_ent_in_out ring_ent_in_out;
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};
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/**
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* sqe commands to the kernel
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*/
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enum fuse_uring_cmd {
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FUSE_IO_URING_CMD_INVALID = 0,
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/* register the request buffer and fetch a fuse request */
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FUSE_IO_URING_CMD_REGISTER = 1,
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/* commit fuse request result and fetch next request */
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FUSE_IO_URING_CMD_COMMIT_AND_FETCH = 2,
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};
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/**
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* In the 80B command area of the SQE.
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*/
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struct fuse_uring_cmd_req {
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uint64_t flags;
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/* entry identifier for commits */
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uint64_t commit_id;
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/* queue the command is for (queue index) */
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uint16_t qid;
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uint8_t padding[6];
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};
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#endif /* _LINUX_FUSE_H */
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