diff options
Diffstat (limited to 'include/fuse_lowlevel.h')
| -rw-r--r-- | include/fuse_lowlevel.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/fuse_lowlevel.h b/include/fuse_lowlevel.h index 395c0d9..12e3946 100644 --- a/include/fuse_lowlevel.h +++ b/include/fuse_lowlevel.h @@ -1160,6 +1160,42 @@ struct fuse_lowlevel_ops { */ void (*readdirplus) (fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *fi); + + /** + * Copy a range of data from one file to another + * + * Performs an optimized copy between two file descriptors without the + * additional cost of transferring data through the FUSE kernel module + * to user space (glibc) and then back into the FUSE filesystem again. + * + * In case this method is not implemented, glibc falls back to reading + * data from the source and writing to the destination. Effectively + * doing an inefficient copy of the data. + * + * If this request is answered with an error code of ENOSYS, this is + * treated as a permanent failure with error code EOPNOTSUPP, i.e. all + * future copy_file_range() requests will fail with EOPNOTSUPP without + * being send to the filesystem process. + * + * Valid replies: + * fuse_reply_write + * fuse_reply_err + * + * @param req request handle + * @param ino_in the inode number or the source file + * @param off_in starting point from were the data should be read + * @param fi_in file information of the source file + * @param ino_out the inode number or the destination file + * @param off_out starting point where the data should be written + * @param fi_out file information of the destination file + * @param len maximum size of the data to copy + * @param flags passed along with the copy_file_range() syscall + */ + void (*copy_file_range) (fuse_req_t req, fuse_ino_t ino_in, + off_t off_in, struct fuse_file_info *fi_in, + fuse_ino_t ino_out, off_t off_out, + struct fuse_file_info *fi_out, size_t len, + int flags); }; /** |