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libfuse
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#include "libfuse_config.h"#include "fuse_opt.h"#include "fuse_log.h"#include <stdint.h>#include <sys/types.h>Go to the source code of this file.
Data Structures | |
| struct | fuse_file_info |
| struct | fuse_loop_config |
| struct | fuse_conn_info |
| struct | fuse_buf |
| struct | fuse_bufvec |
Enumerations | |
| enum | fuse_buf_flags { FUSE_BUF_IS_FD = (1 << 1) , FUSE_BUF_FD_SEEK = (1 << 2) , FUSE_BUF_FD_RETRY = (1 << 3) } |
| enum | fuse_buf_copy_flags { FUSE_BUF_NO_SPLICE = (1 << 1) , FUSE_BUF_FORCE_SPLICE = (1 << 2) , FUSE_BUF_SPLICE_MOVE = (1 << 3) , FUSE_BUF_SPLICE_NONBLOCK = (1 << 4) } |
Functions | |
| struct fuse_conn_info_opts * | fuse_parse_conn_info_opts (struct fuse_args *args) |
| void | fuse_apply_conn_info_opts (struct fuse_conn_info_opts *opts, struct fuse_conn_info *conn) |
| int | fuse_daemonize (int foreground) |
| int | fuse_version (void) |
| const char * | fuse_pkgversion (void) |
| void | fuse_pollhandle_destroy (struct fuse_pollhandle *ph) |
| size_t | fuse_buf_size (const struct fuse_bufvec *bufv) |
| ssize_t | fuse_buf_copy (struct fuse_bufvec *dst, struct fuse_bufvec *src, enum fuse_buf_copy_flags flags) |
| int | fuse_set_signal_handlers (struct fuse_session *se) |
| void | fuse_remove_signal_handlers (struct fuse_session *se) |
| struct fuse_loop_config * | fuse_loop_cfg_create (void) |
| void | fuse_loop_cfg_destroy (struct fuse_loop_config *config) |
| void | fuse_loop_cfg_set_idle_threads (struct fuse_loop_config *config, unsigned int value) |
| void | fuse_loop_cfg_set_max_threads (struct fuse_loop_config *config, unsigned int value) |
| void | fuse_loop_cfg_set_clone_fd (struct fuse_loop_config *config, unsigned int value) |
| void | fuse_loop_cfg_convert (struct fuse_loop_config *config, struct fuse_loop_config_v1 *v1_conf) |
| #define FUSE_CAP_ASYNC_DIO (1 << 15) |
Indicates that the filesystem supports asynchronous direct I/O submission.
If this capability is not requested/available, the kernel will ensure that there is at most one pending read and one pending write request per direct I/O file-handle at any time.
This feature is enabled by default when supported by the kernel.
Definition at line 310 of file fuse_common.h.
| #define FUSE_CAP_ASYNC_READ (1 << 0) |
Indicates that the filesystem supports asynchronous read requests.
If this capability is not requested/available, the kernel will ensure that there is at most one pending read request per file-handle at any time, and will attempt to order read requests by increasing offset.
This feature is enabled by default when supported by the kernel.
Definition at line 164 of file fuse_common.h.
| #define FUSE_CAP_ATOMIC_O_TRUNC (1 << 3) |
Indicates that the filesystem supports the O_TRUNC open flag. If disabled, and an application specifies O_TRUNC, fuse first calls truncate() and then open() with O_TRUNC filtered out.
This feature is enabled by default when supported by the kernel.
Definition at line 181 of file fuse_common.h.
| #define FUSE_CAP_AUTO_INVAL_DATA (1 << 12) |
Traditionally, while a file is open the FUSE kernel module only asks the filesystem for an update of the file's attributes when a client attempts to read beyond EOF. This is unsuitable for e.g. network filesystems, where the file contents may change without the kernel knowing about it.
If this flag is set, FUSE will check the validity of the attributes on every read. If the attributes are no longer valid (i.e., if the attr_timeout passed to fuse_reply_attr() or set in struct fuse_entry_param has passed), it will first issue a getattr request. If the new mtime differs from the previous value, any cached file contents will be invalidated as well.
This flag should always be set when available. If all file changes go through the kernel, attr_timeout should be set to a very large number to avoid unnecessary getattr() calls.
This feature is enabled by default when supported by the kernel.
Definition at line 263 of file fuse_common.h.
| #define FUSE_CAP_CACHE_SYMLINKS (1 << 23) |
Indicates that the kernel supports caching symlinks in its page cache.
When this feature is enabled, symlink targets are saved in the page cache. You can invalidate a cached link by calling: fuse_lowlevel_notify_inval_inode(se, ino, 0, 0);
This feature is disabled by default. If the kernel supports it (>= 4.20), you can enable this feature by setting this flag in the want field of the fuse_conn_info structure.
Definition at line 383 of file fuse_common.h.
| #define FUSE_CAP_DONT_MASK (1 << 6) |
Indicates that the kernel should not apply the umask to the file mode on create operations.
This feature is disabled by default.
Definition at line 196 of file fuse_common.h.
| #define FUSE_CAP_EXPIRE_ONLY (1 << 26) |
Indicates support that dentries can be expired.
Expiring dentries, instead of invalidating them, makes a difference for overmounted dentries, where plain invalidation would detach all submounts before dropping the dentry from the cache. If only expiry is set on the dentry, then any overmounts are left alone and until ->d_revalidate() is called.
Note: ->d_revalidate() is not called for the case of following a submount, so invalidation will only be triggered for the non-overmounted case. The dentry could also be mounted in a different mount instance, in which case any submounts will still be detached.
Definition at line 434 of file fuse_common.h.
| #define FUSE_CAP_EXPLICIT_INVAL_DATA (1 << 25) |
Indicates support for invalidating cached pages only on explicit request.
If this flag is set in the capable field of the fuse_conn_info structure, then the FUSE kernel module supports invalidating cached pages only on explicit request by the filesystem through fuse_lowlevel_notify_inval_inode() or fuse_invalidate_path().
By setting this flag in the want field of the fuse_conn_info structure, the filesystem is responsible for invalidating cached pages through explicit requests to the kernel.
Note that setting this flag does not prevent the cached pages from being flushed by OS itself and/or through user actions.
Note that if both FUSE_CAP_EXPLICIT_INVAL_DATA and FUSE_CAP_AUTO_INVAL_DATA are set in the capable field of the fuse_conn_info structure then FUSE_CAP_AUTO_INVAL_DATA takes precedence.
This feature is disabled by default.
Definition at line 418 of file fuse_common.h.
| #define FUSE_CAP_EXPORT_SUPPORT (1 << 4) |
Indicates that the filesystem supports lookups of "." and "..".
This feature is disabled by default.
Definition at line 188 of file fuse_common.h.
| #define FUSE_CAP_FLOCK_LOCKS (1 << 10) |
If set, the calls to flock(2) will be emulated using POSIX locks and must then be handled by the filesystem's setlock() handler.
If not set, flock(2) calls will be handled by the FUSE kernel module internally (so any access that does not go through the kernel cannot be taken into account).
This feature is enabled by default when supported by the kernel and if the filesystem implements a flock() handler.
Definition at line 234 of file fuse_common.h.
| #define FUSE_CAP_HANDLE_KILLPRIV (1 << 20) |
Indicates that the filesystem is responsible for unsetting setuid and setgid bits when a file is written, truncated, or its owner is changed.
This feature is enabled by default when supported by the kernel.
Definition at line 370 of file fuse_common.h.
| #define FUSE_CAP_IOCTL_DIR (1 << 11) |
Indicates that the filesystem supports ioctl's on directories.
This feature is enabled by default when supported by the kernel.
Definition at line 241 of file fuse_common.h.
| #define FUSE_CAP_NO_OPEN_SUPPORT (1 << 17) |
Indicates support for zero-message opens. If this flag is set in the capable field of the fuse_conn_info structure, then the filesystem may return ENOSYS from the open() handler to indicate success. Further attempts to open files will be handled in the kernel. (If this flag is not set, returning ENOSYS will be treated as an error and signaled to the caller).
Setting (or unsetting) this flag in the want field has no effect.
Definition at line 332 of file fuse_common.h.
| #define FUSE_CAP_NO_OPENDIR_SUPPORT (1 << 24) |
Indicates support for zero-message opendirs. If this flag is set in the capable field of the fuse_conn_info structure, then the filesystem may return ENOSYS from the opendir() handler to indicate success. Further opendir and releasedir messages will be handled in the kernel. (If this flag is not set, returning ENOSYS will be treated as an error and signalled to the caller.)
Setting (or unsetting) this flag in the want field has no effect.
Definition at line 395 of file fuse_common.h.
| #define FUSE_CAP_PARALLEL_DIROPS (1 << 18) |
Indicates support for parallel directory operations. If this flag is unset, the FUSE kernel module will ensure that lookup() and readdir() requests are never issued concurrently for the same directory.
This feature is enabled by default when supported by the kernel.
Definition at line 342 of file fuse_common.h.
| #define FUSE_CAP_POSIX_ACL (1 << 19) |
Indicates support for POSIX ACLs.
If this feature is enabled, the kernel will cache and have responsibility for enforcing ACLs. ACL will be stored as xattrs and passed to userspace, which is responsible for updating the ACLs in the filesystem, keeping the file mode in sync with the ACL, and ensuring inheritance of default ACLs when new filesystem nodes are created. Note that this requires that the file system is able to parse and interpret the xattr representation of ACLs.
Enabling this feature implicitly turns on the default_permissions mount option (even if it was not passed to mount(2)).
This feature is disabled by default.
Definition at line 361 of file fuse_common.h.
| #define FUSE_CAP_POSIX_LOCKS (1 << 1) |
Indicates that the filesystem supports "remote" locking.
This feature is enabled by default when supported by the kernel, and if getlk() and setlk() handlers are implemented.
Definition at line 172 of file fuse_common.h.
| #define FUSE_CAP_READDIRPLUS (1 << 13) |
Indicates that the filesystem supports readdirplus.
This feature is enabled by default when supported by the kernel and if the filesystem implements a readdirplus() handler.
Definition at line 271 of file fuse_common.h.
| #define FUSE_CAP_READDIRPLUS_AUTO (1 << 14) |
Indicates that the filesystem supports adaptive readdirplus.
If FUSE_CAP_READDIRPLUS is not set, this flag has no effect.
If FUSE_CAP_READDIRPLUS is set and this flag is not set, the kernel will always issue readdirplus() requests to retrieve directory contents.
If FUSE_CAP_READDIRPLUS is set and this flag is set, the kernel will issue both readdir() and readdirplus() requests, depending on how much information is expected to be required.
As of Linux 4.20, the algorithm is as follows: when userspace starts to read directory entries, issue a READDIRPLUS request to the filesystem. If any entry attributes have been looked up by the time userspace requests the next batch of entries continue with READDIRPLUS, otherwise switch to plain READDIR. This will reasult in eg plain "ls" triggering READDIRPLUS first then READDIR after that because it doesn't do lookups. "ls -l" should result in all READDIRPLUS, except if dentries are already cached.
This feature is enabled by default when supported by the kernel and if the filesystem implements both a readdirplus() and a readdir() handler.
Definition at line 299 of file fuse_common.h.
| #define FUSE_CAP_SETXATTR_EXT (1 << 27) |
Indicates that an extended 'struct fuse_setxattr' is used by the kernel side - extra_flags are passed, which are used (as of now by acl) processing. For example FUSE_SETXATTR_ACL_KILL_SGID might be set.
Definition at line 441 of file fuse_common.h.
| #define FUSE_CAP_SPLICE_MOVE (1 << 8) |
Indicates that libfuse should try to move pages instead of copying when writing to / reading from the fuse device. This may improve performance.
This feature is disabled by default.
Definition at line 212 of file fuse_common.h.
| #define FUSE_CAP_SPLICE_READ (1 << 9) |
Indicates that libfuse should try to use splice() when reading from the fuse device. This may improve performance.
This feature is enabled by default when supported by the kernel and if the filesystem implements a write_buf() handler.
Definition at line 221 of file fuse_common.h.
| #define FUSE_CAP_SPLICE_WRITE (1 << 7) |
Indicates that libfuse should try to use splice() when writing to the fuse device. This may improve performance.
This feature is disabled by default.
Definition at line 204 of file fuse_common.h.
| #define FUSE_CAP_WRITEBACK_CACHE (1 << 16) |
Indicates that writeback caching should be enabled. This means that individual write request may be buffered and merged in the kernel before they are send to the filesystem.
This feature is disabled by default.
Definition at line 319 of file fuse_common.h.
| #define FUSE_IOCTL_COMPAT (1 << 0) |
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_DIR: is a directory
FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
Definition at line 453 of file fuse_common.h.
| #define FUSE_MAJOR_VERSION 3 |
Major version of FUSE library interface
Definition at line 29 of file fuse_common.h.
| #define FUSE_MINOR_VERSION 16 |
Minor version of FUSE library interface
Definition at line 32 of file fuse_common.h.
| enum fuse_buf_copy_flags |
Buffer copy flags
Definition at line 703 of file fuse_common.h.
| enum fuse_buf_flags |
Buffer flags
Definition at line 672 of file fuse_common.h.
| void fuse_apply_conn_info_opts | ( | struct fuse_conn_info_opts * | opts, |
| struct fuse_conn_info * | conn | ||
| ) |
This function applies the (parsed) parameters in opts to the conn pointer. It may modify the following fields: wants, max_write, max_readahead, congestion_threshold, max_background, time_gran. A field is only set (or unset) if the corresponding option has been explicitly set.
| ssize_t fuse_buf_copy | ( | struct fuse_bufvec * | dst, |
| struct fuse_bufvec * | src, | ||
| enum fuse_buf_copy_flags | flags | ||
| ) |
| size_t fuse_buf_size | ( | const struct fuse_bufvec * | bufv | ) |
| int fuse_daemonize | ( | int | foreground | ) |
| void fuse_loop_cfg_convert | ( | struct fuse_loop_config * | config, |
| struct fuse_loop_config_v1 * | v1_conf | ||
| ) |
Convert old config to more recernt fuse_loop_config2
| config | current config2 type |
| v1_conf | older config1 type (below FUSE API 312) |
Definition at line 454 of file fuse_loop_mt.c.
| struct fuse_loop_config * fuse_loop_cfg_create | ( | void | ) |
Create and set default config for fuse_session_loop_mt and fuse_loop_mt.
Definition at line 427 of file fuse_loop_mt.c.
| void fuse_loop_cfg_destroy | ( | struct fuse_loop_config * | config | ) |
Free the config data structure
Definition at line 441 of file fuse_loop_mt.c.
| void fuse_loop_cfg_set_clone_fd | ( | struct fuse_loop_config * | config, |
| unsigned int | value | ||
| ) |
fuse_loop_config setter to enable the clone_fd feature
Definition at line 482 of file fuse_loop_mt.c.
| void fuse_loop_cfg_set_idle_threads | ( | struct fuse_loop_config * | config, |
| unsigned int | value | ||
| ) |
fuse_loop_config setter to set the number of max idle threads.
Definition at line 462 of file fuse_loop_mt.c.
| void fuse_loop_cfg_set_max_threads | ( | struct fuse_loop_config * | config, |
| unsigned int | value | ||
| ) |
fuse_loop_config setter to set the number of max threads.
Definition at line 476 of file fuse_loop_mt.c.
| struct fuse_conn_info_opts * fuse_parse_conn_info_opts | ( | struct fuse_args * | args | ) |
This function parses several command-line options that can be used to override elements of struct fuse_conn_info. The pointer returned by this function should be passed to the fuse_apply_conn_info_opts() method by the file system's init() handler.
Before using this function, think twice if you really want these parameters to be adjustable from the command line. In most cases, they should be determined by the file system internally.
The following options are recognized:
-o max_write=N sets conn->max_write -o max_readahead=N sets conn->max_readahead -o max_background=N sets conn->max_background -o congestion_threshold=N sets conn->congestion_threshold -o async_read sets FUSE_CAP_ASYNC_READ in conn->want -o sync_read unsets FUSE_CAP_ASYNC_READ in conn->want -o atomic_o_trunc sets FUSE_CAP_ATOMIC_O_TRUNC in conn->want -o no_remote_lock Equivalent to -o no_remote_flock,no_remote_posix_lock -o no_remote_flock Unsets FUSE_CAP_FLOCK_LOCKS in conn->want -o no_remote_posix_lock Unsets FUSE_CAP_POSIX_LOCKS in conn->want -o [no_]splice_write (un-)sets FUSE_CAP_SPLICE_WRITE in conn->want -o [no_]splice_move (un-)sets FUSE_CAP_SPLICE_MOVE in conn->want -o [no_]splice_read (un-)sets FUSE_CAP_SPLICE_READ in conn->want -o [no_]auto_inval_data (un-)sets FUSE_CAP_AUTO_INVAL_DATA in conn->want -o readdirplus=no unsets FUSE_CAP_READDIRPLUS in conn->want -o readdirplus=yes sets FUSE_CAP_READDIRPLUS and unsets FUSE_CAP_READDIRPLUS_AUTO in conn->want -o readdirplus=auto sets FUSE_CAP_READDIRPLUS and FUSE_CAP_READDIRPLUS_AUTO in conn->want -o [no_]async_dio (un-)sets FUSE_CAP_ASYNC_DIO in conn->want -o [no_]writeback_cache (un-)sets FUSE_CAP_WRITEBACK_CACHE in conn->want -o time_gran=N sets conn->time_gran
Known options will be removed from args, unknown options will be passed through unchanged.
| args | argument vector (input+output) |
| const char * fuse_pkgversion | ( | void | ) |
| void fuse_pollhandle_destroy | ( | struct fuse_pollhandle * | ph | ) |
| void fuse_remove_signal_handlers | ( | struct fuse_session * | se | ) |
Restore default signal handlers
Resets global session. After this fuse_set_signal_handlers() may be called again.
| se | the same session as given in fuse_set_signal_handlers() |
See also: fuse_set_signal_handlers()
Definition at line 79 of file fuse_signals.c.
| int fuse_set_signal_handlers | ( | struct fuse_session * | se | ) |
Exit session on HUP, TERM and INT signals and ignore PIPE signal
Stores session in a global variable. May only be called once per process until fuse_remove_signal_handlers() is called.
Once either of the POSIX signals arrives, the signal handler calls fuse_session_exit().
| se | the session to exit |
See also: fuse_remove_signal_handlers()
Definition at line 62 of file fuse_signals.c.
1.9.4