3d268eda3d
that can be used by file systems.
* Changed the way the file cache works: instead of reading/writing to the
underlying device directly, it can now be used for any data source, ie.
also network file systems.
* As a result, the former pages_io() moved to the VFS layer, and can now be
called by a file system via {read|write}_file_io_vec_pages() (naming
suggestions are always welcomed :-)). It now gets an FD, and uses that to
communicate with the device (via its fs_{read|write}_pages() hooks).
* The file_cache_{read|write}() functions must now be called without holding
an I/O relevant file system lock. That allows the file cache to prepare the
pages without colliding with the page writer, IOW the "mayBlock" flag can
go into the attic again (yay!).
* This also results in a much better performance when the system does I/O and
is low on memory, as the page writer can now finally write back some pages,
and that even without maxing out the CPU :)
* The API changes put slightly more burden on the fs_{read|write}_pages()
hooks, but in combination with the file_map it's still pretty straight
forward. It just will have to dispatch the call to the underlying device
directly, usually it will just call its fs_{read|write}_pages() hooks
via the above mentioned calls.
* Ported BFS and FAT to the new API, the latter has not been tested, though.
* Also ported the API changes to the fs_shell. I also completely removed its
file cache level page handling - the downside is that device access is no
longer cached (ie. depends on the host OS now), the upside is that the code
is greatly simplified.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22886 a95241bf-73f2-0310-859d-f6bbb57e9c96
295 lines
12 KiB
C
295 lines
12 KiB
C
/*
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* Copyright 2004-2007, Haiku Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _FS_INTERFACE_H
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#define _FS_INTERFACE_H
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/*! File System Interface Layer Definition */
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#include <OS.h>
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#include <Select.h>
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#include <module.h>
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#include <disk_device_manager.h>
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#include <sys/uio.h>
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struct dirent;
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struct stat;
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struct fs_info;
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struct select_sync;
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/* the file system's private data structures */
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typedef void *fs_volume;
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typedef void *fs_cookie;
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typedef void *fs_vnode;
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/* passed to write_stat() */
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enum write_stat_mask {
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FS_WRITE_STAT_MODE = 0x0001,
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FS_WRITE_STAT_UID = 0x0002,
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FS_WRITE_STAT_GID = 0x0004,
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FS_WRITE_STAT_SIZE = 0x0008,
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FS_WRITE_STAT_ATIME = 0x0010,
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FS_WRITE_STAT_MTIME = 0x0020,
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FS_WRITE_STAT_CRTIME = 0x0040
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// NOTE: Changing these constants will break
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// src/kits/storage/LibBeAdapter.cpp:_kern_write_stat().
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};
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/* passed to write_fs_info() */
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#define FS_WRITE_FSINFO_NAME 0x0001
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struct file_io_vec {
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off_t offset;
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off_t length;
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};
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#define B_CURRENT_FS_API_VERSION "/v1"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct file_system_module_info {
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struct module_info info;
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const char* pretty_name;
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uint32 flags; // DDM flags
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/* scanning (the device is write locked) */
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float (*identify_partition)(int fd, partition_data *partition,
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void **cookie);
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status_t (*scan_partition)(int fd, partition_data *partition,
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void *cookie);
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void (*free_identify_partition_cookie)(partition_data *partition,
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void *cookie);
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void (*free_partition_content_cookie)(partition_data *partition);
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/* general operations */
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status_t (*mount)(dev_t id, const char *device, uint32 flags,
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const char *args, fs_volume *_fs, ino_t *_rootVnodeID);
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status_t (*unmount)(fs_volume fs);
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status_t (*read_fs_info)(fs_volume fs, struct fs_info *info);
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status_t (*write_fs_info)(fs_volume fs, const struct fs_info *info,
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uint32 mask);
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status_t (*sync)(fs_volume fs);
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/* vnode operations */
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status_t (*lookup)(fs_volume fs, fs_vnode dir, const char *name,
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ino_t *_id, int *_type);
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status_t (*get_vnode_name)(fs_volume fs, fs_vnode vnode, char *buffer,
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size_t bufferSize);
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status_t (*get_vnode)(fs_volume fs, ino_t id, fs_vnode *_vnode,
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bool reenter);
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status_t (*put_vnode)(fs_volume fs, fs_vnode vnode, bool reenter);
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status_t (*remove_vnode)(fs_volume fs, fs_vnode vnode, bool reenter);
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/* VM file access */
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bool (*can_page)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*read_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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off_t pos, const iovec *vecs, size_t count, size_t *_numBytes,
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bool reenter);
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status_t (*write_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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off_t pos, const iovec *vecs, size_t count, size_t *_numBytes,
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bool reenter);
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/* cache file access */
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status_t (*get_file_map)(fs_volume fs, fs_vnode vnode, off_t offset,
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size_t size, struct file_io_vec *vecs, size_t *_count);
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/* common operations */
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status_t (*ioctl)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, ulong op,
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void *buffer, size_t length);
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status_t (*set_flags)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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int flags);
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status_t (*select)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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uint8 event, uint32 ref, selectsync *sync);
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status_t (*deselect)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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uint8 event, selectsync *sync);
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status_t (*fsync)(fs_volume fs, fs_vnode vnode);
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status_t (*read_symlink)(fs_volume fs, fs_vnode link, char *buffer,
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size_t *_bufferSize);
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status_t (*create_symlink)(fs_volume fs, fs_vnode dir, const char *name,
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const char *path, int mode);
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status_t (*link)(fs_volume fs, fs_vnode dir, const char *name,
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fs_vnode vnode);
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status_t (*unlink)(fs_volume fs, fs_vnode dir, const char *name);
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status_t (*rename)(fs_volume fs, fs_vnode fromDir, const char *fromName,
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fs_vnode toDir, const char *toName);
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status_t (*access)(fs_volume fs, fs_vnode vnode, int mode);
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status_t (*read_stat)(fs_volume fs, fs_vnode vnode, struct stat *stat);
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status_t (*write_stat)(fs_volume fs, fs_vnode vnode,
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const struct stat *stat, uint32 statMask);
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/* file operations */
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status_t (*create)(fs_volume fs, fs_vnode dir, const char *name,
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int openMode, int perms, fs_cookie *_cookie,
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ino_t *_newVnodeID);
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status_t (*open)(fs_volume fs, fs_vnode vnode, int openMode,
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fs_cookie *_cookie);
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status_t (*close)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*free_cookie)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*read)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
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void *buffer, size_t *length);
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status_t (*write)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
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const void *buffer, size_t *length);
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/* directory operations */
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status_t (*create_dir)(fs_volume fs, fs_vnode parent, const char *name,
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int perms, ino_t *_newVnodeID);
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status_t (*remove_dir)(fs_volume fs, fs_vnode parent, const char *name);
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status_t (*open_dir)(fs_volume fs, fs_vnode vnode, fs_cookie *_cookie);
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status_t (*close_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*free_dir_cookie)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*read_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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struct dirent *buffer, size_t bufferSize, uint32 *_num);
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status_t (*rewind_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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/* attribute directory operations */
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status_t (*open_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie *_cookie);
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status_t (*close_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*free_attr_dir_cookie)(fs_volume fs, fs_vnode vnode,
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fs_cookie cookie);
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status_t (*read_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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struct dirent *buffer, size_t bufferSize, uint32 *_num);
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status_t (*rewind_attr_dir)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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/* attribute operations */
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status_t (*create_attr)(fs_volume fs, fs_vnode vnode, const char *name,
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uint32 type, int openMode, fs_cookie *_cookie);
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status_t (*open_attr)(fs_volume fs, fs_vnode vnode, const char *name,
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int openMode, fs_cookie *_cookie);
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status_t (*close_attr)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
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status_t (*free_attr_cookie)(fs_volume fs, fs_vnode vnode,
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fs_cookie cookie);
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status_t (*read_attr)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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off_t pos, void *buffer, size_t *length);
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status_t (*write_attr)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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off_t pos, const void *buffer, size_t *length);
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status_t (*read_attr_stat)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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struct stat *stat);
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status_t (*write_attr_stat)(fs_volume fs, fs_vnode vnode, fs_cookie cookie,
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const struct stat *stat, int statMask);
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status_t (*rename_attr)(fs_volume fs, fs_vnode fromVnode,
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const char *fromName, fs_vnode toVnode, const char *toName);
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status_t (*remove_attr)(fs_volume fs, fs_vnode vnode, const char *name);
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/* index directory & index operations */
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status_t (*open_index_dir)(fs_volume fs, fs_cookie *cookie);
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status_t (*close_index_dir)(fs_volume fs, fs_cookie cookie);
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status_t (*free_index_dir_cookie)(fs_volume fs, fs_cookie cookie);
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status_t (*read_index_dir)(fs_volume fs, fs_cookie cookie,
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struct dirent *buffer, size_t bufferSize, uint32 *_num);
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status_t (*rewind_index_dir)(fs_volume fs, fs_cookie cookie);
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status_t (*create_index)(fs_volume fs, const char *name, uint32 type,
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uint32 flags);
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status_t (*remove_index)(fs_volume fs, const char *name);
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status_t (*read_index_stat)(fs_volume fs, const char *name,
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struct stat *stat);
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/* query operations */
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status_t (*open_query)(fs_volume fs, const char *query, uint32 flags,
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port_id port, uint32 token, fs_cookie *_cookie);
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status_t (*close_query)(fs_volume fs, fs_cookie cookie);
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status_t (*free_query_cookie)(fs_volume fs, fs_cookie cookie);
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status_t (*read_query)(fs_volume fs, fs_cookie cookie,
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struct dirent *buffer, size_t bufferSize, uint32 *_num);
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status_t (*rewind_query)(fs_volume fs, fs_cookie cookie);
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/* capability querying (the device is read locked) */
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uint32 (*get_supported_operations)(partition_data* partition, uint32 mask);
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bool (*validate_resize)(partition_data *partition, off_t *size);
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bool (*validate_move)(partition_data *partition, off_t *start);
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bool (*validate_set_content_name)(partition_data *partition,
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char *name);
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bool (*validate_set_content_parameters)(partition_data *partition,
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const char *parameters);
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bool (*validate_initialize)(partition_data *partition, char *name,
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const char *parameters);
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/* shadow partition modification (device is write locked) */
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status_t (*shadow_changed)(partition_data *partition,
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partition_data *child, uint32 operation);
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/* writing (the device is NOT locked) */
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status_t (*defragment)(int fd, partition_id partition,
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disk_job_id job);
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status_t (*repair)(int fd, partition_id partition, bool checkOnly,
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disk_job_id job);
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status_t (*resize)(int fd, partition_id partition, off_t size,
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disk_job_id job);
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status_t (*move)(int fd, partition_id partition, off_t offset,
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disk_job_id job);
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status_t (*set_content_name)(int fd, partition_id partition,
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const char *name, disk_job_id job);
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status_t (*set_content_parameters)(int fd, partition_id partition,
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const char *parameters, disk_job_id job);
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status_t (*initialize)(int fd, partition_id partition, const char *name,
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const char *parameters, off_t partitionSize, disk_job_id job);
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} file_system_module_info;
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/* file system add-ons only prototypes */
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extern status_t new_vnode(dev_t mountID, ino_t vnodeID,
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fs_vnode privateNode);
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extern status_t publish_vnode(dev_t mountID, ino_t vnodeID,
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fs_vnode privateNode);
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extern status_t get_vnode(dev_t mountID, ino_t vnodeID,
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fs_vnode *_privateNode);
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extern status_t put_vnode(dev_t mountID, ino_t vnodeID);
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extern status_t remove_vnode(dev_t mountID, ino_t vnodeID);
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extern status_t unremove_vnode(dev_t mountID, ino_t vnodeID);
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extern status_t get_vnode_removed(dev_t mountID, ino_t vnodeID,
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bool* removed);
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extern status_t read_pages(int fd, off_t pos, const struct iovec *vecs,
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size_t count, size_t *_numBytes, bool fsReenter);
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extern status_t write_pages(int fd, off_t pos, const struct iovec *vecs,
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size_t count, size_t *_numBytes, bool fsReenter);
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extern status_t read_file_io_vec_pages(int fd,
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const struct file_io_vec *fileVecs, size_t fileVecCount,
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const struct iovec *vecs, size_t vecCount,
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uint32 *_vecIndex, size_t *_vecOffset, size_t *_bytes);
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extern status_t write_file_io_vec_pages(int fd,
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const struct file_io_vec *fileVecs, size_t fileVecCount,
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const struct iovec *vecs, size_t vecCount,
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uint32 *_vecIndex, size_t *_vecOffset, size_t *_bytes);
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// Deprecated! Will disappear soon!
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extern status_t notify_listener(int op, dev_t device, ino_t parentNode,
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ino_t toParentNode, ino_t node, const char *name);
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extern status_t notify_entry_created(dev_t device, ino_t directory,
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const char *name, ino_t node);
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extern status_t notify_entry_removed(dev_t device, ino_t directory,
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const char *name, ino_t node);
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extern status_t notify_entry_moved(dev_t device, ino_t fromDirectory,
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const char *fromName, ino_t toDirectory,
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const char *toName, ino_t node);
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extern status_t notify_stat_changed(dev_t device, ino_t node,
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uint32 statFields);
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extern status_t notify_attribute_changed(dev_t device, ino_t node,
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const char *attribute, int32 cause);
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extern status_t notify_query_entry_created(port_id port, int32 token,
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dev_t device, ino_t directory, const char *name,
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ino_t node);
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extern status_t notify_query_entry_removed(port_id port, int32 token,
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dev_t device, ino_t directory, const char *name,
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ino_t node);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FS_INTERFACE_H */
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