97e069713b
systems a chance to know if they have locked already. This fixes a locking problem in BFS where one thread tried to acquire two read locks (where someone else trying to acquire a write lock would have caused a dead lock). git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17108 a95241bf-73f2-0310-859d-f6bbb57e9c96
191 lines
7.7 KiB
C
191 lines
7.7 KiB
C
/*
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* Copyright 2002-2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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* Distributed under the terms of the NewOS License.
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*/
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#ifndef _KERNEL_VFS_H
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#define _KERNEL_VFS_H
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#include <kernel.h>
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#include <lock.h>
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#include <util/list.h>
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#include <fs_interface.h>
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#include <dirent.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/select.h>
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#define DEFAULT_FD_TABLE_SIZE 128
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#define MAX_FD_TABLE_SIZE 2048
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#define MAX_NODE_MONITORS 4096
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struct kernel_args;
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struct vm_cache_ref;
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struct file_descriptor;
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struct selectsync;
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struct pollfd;
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/** The I/O context of a process/team, holds the fd array among others */
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typedef struct io_context {
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struct vnode *cwd;
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mutex io_mutex;
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uint32 table_size;
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uint32 num_used_fds;
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struct file_descriptor **fds;
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uint8 *fds_close_on_exec;
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struct list node_monitors;
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uint32 num_monitors;
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uint32 max_monitors;
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} io_context;
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struct fd_info {
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int number;
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int32 open_mode;
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dev_t device;
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ino_t node;
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};
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/* macro to allocate a iovec array on the stack */
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#define IOVECS(name, size) \
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uint8 _##name[sizeof(iovecs) + (size)*sizeof(iovec)]; \
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iovecs *name = (iovecs *)_##name
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#ifdef __cplusplus
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extern "C" {
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#endif
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status_t vfs_init(struct kernel_args *args);
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status_t vfs_bootstrap_file_systems(void);
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status_t vfs_mount_boot_file_system(struct kernel_args *args);
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void vfs_exec_io_context(void *context);
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void *vfs_new_io_context(void *parentContext);
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status_t vfs_free_io_context(void *context);
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struct rlimit;
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int vfs_getrlimit(int resource, struct rlimit * rlp);
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int vfs_setrlimit(int resource, const struct rlimit * rlp);
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/* calls needed by the VM for paging and by the file cache */
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int vfs_get_vnode_from_fd(int fd, bool kernel, void **vnode);
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status_t vfs_get_vnode_from_path(const char *path, bool kernel, void **vnode);
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status_t vfs_get_vnode(mount_id mountID, vnode_id vnodeID, void **_vnode);
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status_t vfs_entry_ref_to_vnode(mount_id mountID, vnode_id directoryID,
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const char *name, void **_vnode);
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void vfs_vnode_to_node_ref(void *_vnode, mount_id *_mountID, vnode_id *_vnodeID);
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status_t vfs_lookup_vnode(mount_id mountID, vnode_id vnodeID, void **_vnode);
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void vfs_put_vnode(void *vnode);
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void vfs_acquire_vnode(void *vnode);
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status_t vfs_get_cookie_from_fd(int fd, void **_cookie);
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bool vfs_can_page(void *vnode, void *cookie);
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status_t vfs_read_pages(void *vnode, void *cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool fsReenter);
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status_t vfs_write_pages(void *vnode, void *cookie, off_t pos,
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const iovec *vecs, size_t count, size_t *_numBytes, bool fsReenter);
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status_t vfs_get_vnode_cache(void *vnode, struct vm_cache_ref **_cache, bool allocate);
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status_t vfs_get_file_map( void *_vnode, off_t offset, size_t size,
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struct file_io_vec *vecs, size_t *_count);
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status_t vfs_get_fs_node_from_path(mount_id mountID, const char *path,
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bool kernel, void **_node);
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status_t vfs_stat_vnode(void *_vnode, struct stat *stat);
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status_t vfs_get_vnode_name(void *vnode, char *name, size_t nameSize);
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status_t vfs_get_cwd(mount_id *_mountID, vnode_id *_vnodeID);
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status_t vfs_disconnect_vnode(mount_id mountID, vnode_id vnodeID);
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void vfs_free_unused_vnodes(int32 level);
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/* special module convenience call */
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status_t vfs_get_module_path(const char *basePath, const char *moduleName,
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char *pathBuffer, size_t bufferSize);
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/* service call for whoever needs a normalized path */
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status_t vfs_normalize_path(const char *path, char *buffer, size_t bufferSize,
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bool kernel);
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/* service call for the node monitor */
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status_t resolve_mount_point_to_volume_root(mount_id mountID, vnode_id nodeID,
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mount_id *resolvedMountID, vnode_id *resolvedNodeID);
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/* calls the syscall dispatcher should use for user file I/O */
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dev_t _user_mount(const char *path, const char *device, const char *fs_name,
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uint32 flags, const char *args, size_t argsLength);
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status_t _user_unmount(const char *path, uint32 flags);
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status_t _user_read_fs_info(dev_t device, struct fs_info *info);
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status_t _user_write_fs_info(dev_t device, const struct fs_info *info, int mask);
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dev_t _user_next_device(int32 *_cookie);
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status_t _user_sync(void);
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status_t _user_get_next_fd_info(team_id team, uint32 *cookie, struct fd_info *info,
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size_t infoSize);
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status_t _user_entry_ref_to_path(dev_t device, ino_t inode, const char *leaf,
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char *userPath, size_t pathLength);
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int _user_open_entry_ref(dev_t device, ino_t inode, const char *name, int openMode, int perms);
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int _user_open(int fd, const char *path, int openMode, int perms);
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int _user_open_dir_node_ref(dev_t device, ino_t inode);
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int _user_open_dir_entry_ref(dev_t device, ino_t inode, const char *uname);
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int _user_open_dir(int fd, const char *path);
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int _user_open_parent_dir(int fd, char *name, size_t nameLength);
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status_t _user_fcntl(int fd, int op, uint32 argument);
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status_t _user_fsync(int fd);
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status_t _user_read_stat(int fd, const char *path, bool traverseLink,
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struct stat *stat, size_t statSize);
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status_t _user_write_stat(int fd, const char *path, bool traverseLink,
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const struct stat *stat, size_t statSize, int statMask);
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off_t _user_seek(int fd, off_t pos, int seekType);
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status_t _user_create_dir_entry_ref(dev_t device, ino_t inode, const char *name, int perms);
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status_t _user_create_dir(int fd, const char *path, int perms);
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status_t _user_remove_dir(int fd, const char *path);
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status_t _user_read_link(int fd, const char *path, char *buffer, size_t *_bufferSize);
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status_t _user_write_link(const char *path, const char *toPath);
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status_t _user_create_symlink(int fd, const char *path, const char *toPath,
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int mode);
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status_t _user_create_link(const char *path, const char *toPath);
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status_t _user_unlink(int fd, const char *path);
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status_t _user_rename(int oldFD, const char *oldpath, int newFD,
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const char *newpath);
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status_t _user_access(const char *path, int mode);
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ssize_t _user_select(int numfds, fd_set *readSet, fd_set *writeSet, fd_set *errorSet,
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bigtime_t timeout, const sigset_t *sigMask);
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ssize_t _user_poll(struct pollfd *fds, int numfds, bigtime_t timeout);
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int _user_open_attr_dir(int fd, const char *path);
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int _user_create_attr(int fd, const char *name, uint32 type, int openMode);
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int _user_open_attr(int fd, const char *name, int openMode);
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status_t _user_remove_attr(int fd, const char *name);
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status_t _user_rename_attr(int fromFile, const char *fromName, int toFile, const char *toName);
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int _user_open_index_dir(dev_t device);
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status_t _user_create_index(dev_t device, const char *name, uint32 type, uint32 flags);
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status_t _user_read_index_stat(dev_t device, const char *name, struct stat *stat);
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status_t _user_remove_index(dev_t device, const char *name);
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status_t _user_getcwd(char *buffer, size_t size);
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status_t _user_setcwd(int fd, const char *path);
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int _user_open_query(dev_t device, const char *query, size_t queryLength, uint32 flags,
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port_id port, int32 token);
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/* fd user prototypes (implementation located in fd.c) */
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extern ssize_t _user_read(int fd, off_t pos, void *buffer, size_t bufferSize);
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extern ssize_t _user_readv(int fd, off_t pos, const iovec *vecs, size_t count);
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extern ssize_t _user_write(int fd, off_t pos, const void *buffer, size_t bufferSize);
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extern ssize_t _user_writev(int fd, off_t pos, const iovec *vecs, size_t count);
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extern status_t _user_ioctl(int fd, ulong cmd, void *data, size_t length);
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extern ssize_t _user_read_dir(int fd, struct dirent *buffer, size_t bufferSize, uint32 maxCount);
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extern status_t _user_rewind_dir(int fd);
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extern status_t _user_close(int fd);
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extern int _user_dup(int fd);
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extern int _user_dup2(int ofd, int nfd);
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extern status_t _user_lock_node(int fd);
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extern status_t _user_unlock_node(int fd);
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/* vfs entry points... */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _KERNEL_VFS_H */
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