Buss Non 30 Fuse Ace Hardware
Provided past: fuse_2.9.four-1ubuntu3_amd64 
Proper noun
fuse - format and options for the fuse file systems
Description
FUSE (Filesystem in Userspace) is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. FUSE likewise aims to provide a secure method for not privileged users to create and mount their ain filesystem implementations.
CONFIGURATION
Some options regarding mount policy tin can be set up in the file /etc/fuse.conf. Currently these options are: mount_max = NNN Prepare the maximum number of FUSE mounts allowed to non-root users. The default is g. user_allow_other Let not-root users to specify the allow_other or allow_root mount options (meet below).
OPTIONS
Nearly of the generic mount options described in mountain are supported (ro, rw, suid, nosuid, dev, nodev, exec, noexec, atime, noatime, sync, async, dirsync). Filesystems are mounted with nodev,nosuid by default, which tin but be overridden by a privileged user. Full general mount options: These are FUSE specific mountain options that tin be specified for all filesystems: default_permissions By default FUSE doesn't check file admission permissions, the filesystem is free to implement it's access policy or exit it to the underlying file admission mechanism (e.g. in case of network filesystems). This selection enables permission checking, restricting access based on file mode. This is pick is usually useful together with the allow_other mount option. allow_other This selection overrides the security measure restricting file access to the user mounting the filesystem. Then all users (including root) can admission the files. This option is past default only immune to root, but this restriction can exist removed with a configuration choice described in the previous section. allow_root This choice is similar to allow_other but file admission is limited to the user mounting the filesystem and root. This pick and allow_other are mutually sectional. kernel_cache This option disables flushing the cache of the file contents on every open(2). This should only be enabled on filesystems, where the file data is never inverse externally (not through the mounted FUSE filesystem). Thus it is non suitable for network filesystems and other intermediate filesystems. NOTE: if this selection is not specified (and neither direct_io) data is still buried after the open(2), so a read(2) system call volition non always initiate a read operation. auto_cache This option enables automatic flushing of the data cache on open(2). The cache will only be flushed if the modification fourth dimension or the size of the file has changed. large_read Issue big read requests. This can ameliorate performance for some filesystems, merely tin can too degrade performance. This option is only useful on 2.4.10 kernels, equally on 2.6 kernels requests size is automatically determined for optimum performance. direct_io This option disables the use of page cache (file content cache) in the kernel for this filesystem. This has several affects: 1. Each read(ii) or write(ii) system telephone call volition initiate one or more read or write operations, data will non be cached in the kernel. two. The return value of the read() and write() organization calls will correspond to the return values of the read and write operations. This is useful for example if the file size is not known in advance (before reading it). max_read=North With this option the maximum size of read operations can be set. The default is infinite. Note that the size of read requests is express anyway to 32 pages (which is 128kbyte on i386). max_readahead=Due north Gear up the maximum number of bytes to read-alee. The default is determined past the kernel. On linux-2.6.22 or earlier information technology's 131072 (128kbytes) max_write=N Ready the maximum number of bytes in a single write operation. The default is 128kbytes. Annotation, that due to various limitations, the size of write requests can exist much smaller (4kbytes). This limitation will be removed in the future. async_read Perform reads asynchronously. This is the default sync_read Perform all reads (fifty-fifty read-ahead) synchronously. hard_remove The default behavior is that if an open file is deleted, the file is renamed to a hidden file (.fuse_hiddenXXX), and only removed when the file is finally released. This relieves the filesystem implementation of having to deal with this trouble. This option disables the hiding behavior, and files are removed immediately in an unlink functioning (or in a rename operation which overwrites an existing file). It is recommended that you lot non use the hard_remove option. When hard_remove is set, the following libc functions fail on unlinked files (returning errno of ENOENT): read(2), write(2), fsync(2), close(2), f*xattr(2), ftruncate(two), fstat(two), fchmod(2), fchown(2) debug Turns on debug data printing by the library. fsname=Proper name Sets the filesystem source (starting time field in /etc/mtab). The default is the mount plan name. subtype=Blazon Sets the filesystem type (third field in /etc/mtab). The default is the mountain plan proper noun. If the kernel suppports information technology, /etc/mtab and /proc/mounts volition show the filesystem type every bit fuse.Type If the kernel doesn't support subtypes, the source filed will be Type#NAME, or if fsname option is not specified, simply TYPE. use_ino Honor the st_ino field in kernel functions getattr() and fill_dir(). This value is used to fill up in the st_ino field in the stat(2), lstat(ii), fstat(2) functions and the d_ino field in the readdir(2) function. The filesystem does not have to guarantee uniqueness, nonetheless some applications rely on this value being unique for the whole filesystem. readdir_ino If use_ino option is not given, nevertheless try to fill in the d_ino field in readdir(two). If the name was previously looked up, and is even so in the cache, the inode number plant there will exist used. Otherwise information technology volition exist set to -1. If use_ino choice is given, this option is ignored. nonempty Allows mounts over a non-empty file or directory. Past default these mounts are rejected to forestall accidental roofing upwards of information, which could for example prevent automatic backup. umask=M Override the permission bits in st_mode set past the filesystem. The resulting permission bits are the ones missing from the given umask value. The value is given in octal representation. uid=N Override the st_uid field set past the filesystem (Northward is numeric). gid=N Override the st_gid field set by the filesystem (N is numeric). blkdev Mount a filesystem backed by a block device. This is a privileged option. The device must be specified with the fsname=Name option. entry_timeout=T The timeout in seconds for which name lookups will be cached. The default is 1.0 second. For all the timeout options, information technology is possible to give fractions of a 2d as well (e.g. entry_timeout=2.8) negative_timeout=T The timeout in seconds for which a negative lookup will exist buried. This ways, that if file did not exist (lookup retuned ENOENT), the lookup will only be redone after the timeout, and the file/directory will be assumed to not exist until then. The default is 0.0 second, meaning that caching negative lookups are disabled. attr_timeout=T The timeout in seconds for which file/directory attributes are cached. The default is 1.0 2nd. ac_attr_timeout=T The timeout in seconds for which file attributes are cached for the purpose of checking if auto_cache should flush the file data on open. The default is the value of attr_timeout intr Let requests to be interrupted. Turning on this option may outcome in unexpected behavior, if the filesystem does not back up request interruption. intr_signal=NUM Specify which signal number to ship to the filesystem when a request is interrupted. The default is hardcoded to USR1. modules=M1[:M2...] Add together modules to the filesystem stack. Modules are pushed in the guild they are specified, with the original filesystem beingness on the lesser of the stack.
FUSE MODULES (STACKING)
Modules are filesystem stacking support to high level API. Filesystem modules tin can exist built into libfuse or loaded from shared object iconv Perform file name graphic symbol set conversion. Options are: from_code=CHARSET Character set to convert from (see iconv -l for a list of possible values). Default is UTF-eight. to_code=CHARSET Grapheme set to convert to. Default is determined by the current locale. subdir Prepend a given directory to each path. Options are: subdir=DIR Directory to prepend to all paths. This pick is mandatory. rellinks Transform absolute symlinks into relative norellinks Do not transform accented symlinks into relative. This is the default.
SECURITY
The fusermount program is installed prepare-user-gid to fuse. This is done to let users from fuse group to mountain their own filesystem implementations. There must even so be some limitations, in order to preclude Bad User from doing nasty things. Currently those limitations are: 1. The user tin can only mount on a mountpoint, for which it has write permission ii. The mountpoint is not a glutinous directory which isn't endemic by the user (similar /tmp ordinarily is) 3. No other user (including root) tin can admission the contents of the mounted filesystem.
Annotation
FUSE filesystems are unmounted using the fusermount(i) command (fusermount -u mountpoint).
AUTHORS
The main writer of FUSE is Miklos Szeredi <mszeredi@inf.bme.hu>. This homo page was written past Bastien Roucaries <roucaries.bastien+debian@gmail.com> for the Debian GNU/Linux distribution (but it may be used by others) from README file.
Come across ALSO
fusermount(1) mount(8) fuse(eight)
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