diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/fuse_lowlevel.c | 43 | ||||
| -rw-r--r-- | lib/fuse_versionscript | 2 |
2 files changed, 45 insertions, 0 deletions
diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c index c08c99c..1f3a5fa 100644 --- a/lib/fuse_lowlevel.c +++ b/lib/fuse_lowlevel.c @@ -27,6 +27,7 @@ #include <errno.h> #include <assert.h> #include <sys/file.h> +#include <sys/ioctl.h> #ifndef F_LINUX_SPECIFIC_BASE #define F_LINUX_SPECIFIC_BASE 1024 @@ -400,6 +401,10 @@ static void fill_open(struct fuse_open_out *arg, const struct fuse_file_info *f) { arg->fh = f->fh; + if (f->backing_id > 0) { + arg->backing_id = f->backing_id; + arg->open_flags |= FOPEN_PASSTHROUGH; + } if (f->direct_io) arg->open_flags |= FOPEN_DIRECT_IO; if (f->keep_cache) @@ -466,6 +471,31 @@ int fuse_reply_readlink(fuse_req_t req, const char *linkname) return send_reply_ok(req, linkname, strlen(linkname)); } +int fuse_passthrough_open(fuse_req_t req, int fd) +{ + struct fuse_backing_map map = { .fd = fd }; + int ret; + + ret = ioctl(req->se->fd, FUSE_DEV_IOC_BACKING_OPEN, &map); + if (ret <= 0) { + fuse_log(FUSE_LOG_ERR, "fuse: passthrough_open: %s\n", strerror(errno)); + return 0; + } + + return ret; +} + +int fuse_passthrough_close(fuse_req_t req, int backing_id) +{ + int ret; + + ret = ioctl(req->se->fd, FUSE_DEV_IOC_BACKING_CLOSE, &backing_id); + if (ret < 0) + fuse_log(FUSE_LOG_ERR, "fuse: passthrough_close: %s\n", strerror(errno)); + + return ret; +} + int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *f) { struct fuse_open_out arg; @@ -2027,6 +2057,8 @@ void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) se->conn.capable |= FUSE_CAP_DIRECT_IO_ALLOW_MMAP; if (arg->minor >= 38 || (inargflags & FUSE_HAS_EXPIRE_ONLY)) se->conn.capable |= FUSE_CAP_EXPIRE_ONLY; + if (inargflags & FUSE_PASSTHROUGH) + se->conn.capable |= FUSE_CAP_PASSTHROUGH; } else { se->conn.max_readahead = 0; } @@ -2161,6 +2193,14 @@ void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) outargflags |= FUSE_SETXATTR_EXT; if (se->conn.want & FUSE_CAP_DIRECT_IO_ALLOW_MMAP) outargflags |= FUSE_DIRECT_IO_ALLOW_MMAP; + if (se->conn.want & FUSE_CAP_PASSTHROUGH) { + outargflags |= FUSE_PASSTHROUGH; + /* + * outarg.max_stack_depth includes the fuse stack layer, + * so it is one more than max_backing_stack_depth. + */ + outarg.max_stack_depth = se->conn.max_backing_stack_depth + 1; + } if (inargflags & FUSE_INIT_EXT) { outargflags |= FUSE_INIT_EXT; @@ -2199,6 +2239,9 @@ void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) outarg.congestion_threshold); fuse_log(FUSE_LOG_DEBUG, " time_gran=%u\n", outarg.time_gran); + if (se->conn.want & FUSE_CAP_PASSTHROUGH) + fuse_log(FUSE_LOG_DEBUG, " max_stack_depth=%u\n", + outarg.max_stack_depth); } if (arg->minor < 5) outargsize = FUSE_COMPAT_INIT_OUT_SIZE; diff --git a/lib/fuse_versionscript b/lib/fuse_versionscript index 22782bc..d0b98f6 100644 --- a/lib/fuse_versionscript +++ b/lib/fuse_versionscript @@ -194,6 +194,8 @@ FUSE_3.17 { _fuse_new_30; _fuse_new_317; fuse_main_real_317; + fuse_passthrough_open; + fuse_passthrough_close; } FUSE_3.12; # Local Variables: |