f4153a493d
Replace the 256 byte buffer used for names in the XFS filesystem with a
dynamically allocated buffer.
The define XFS_MAXFILENAMELEN which used to be 255 has been retained,
but bumped to 1023. This value is no longer used for long-lived
allocations, but is used in chansrv_fuse.c for maintaining state
information for in-fligh I/O requests.
(cherry picked from commit d8b5435710)
326 lines
9.2 KiB
C
326 lines
9.2 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is the interface to the FUSE file system used by
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* chansrv
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*/
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#ifndef _CHANSRV_XFS
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#define _CHANSRV_XFS
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/* Skip this include if there's no FUSE */
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#ifdef XRDP_FUSE
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#include <stddef.h>
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#include <fuse_lowlevel.h>
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#include <time.h>
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#include "arch.h"
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/* Maximum length of filename supported (in bytes).
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* This is a sensible limit to a filename length. It is not used by
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* this module to allocate long-lived storage, so it can be increased
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* if necessary */
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#define XFS_MAXFILENAMELEN 1023
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/*
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* Incomplete types for the public interface
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*/
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struct xfs_fs;
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struct xfs_dir_handle;
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/**
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* Describe an inode in the XFS filesystem
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*/
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typedef struct xfs_inode
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{
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fuse_ino_t inum; /* File serial number. */
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mode_t mode; /* File mode. */
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uid_t uid; /* User ID of the file's owner. */
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gid_t gid; /* Group ID of the file's group. */
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off_t size; /* Size of file, in bytes. */
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time_t atime; /* Time of last access. */
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time_t mtime; /* Time of last modification. */
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time_t ctime; /* Time of last status change. */
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char *name; /* Short name (dynamically allocated) */
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tui32 generation; /* Changes if inode is reused */
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char is_redirected; /* file is on redirected device */
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tui32 device_id; /* device ID of redirected device */
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int lindex; /* used in clipboard operations */
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} XFS_INODE;
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/*
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* Create a new filesystem instance
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*
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* @param umask Umask to apply to initial data structures
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* @param uid Owner UID for initial root directory
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* @param gid Owner GID for initial root directory
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* @return Pointer to instance, or NULL if no memory
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*/
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struct xfs_fs *
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xfs_create_xfs_fs(mode_t umask, uid_t uid, gid_t gid);
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/*
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* Delete a filesystem instance
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*
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* @param xfs Filesystem instance
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*/
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void
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xfs_delete_xfs_fs(struct xfs_fs *xfs);
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/*
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* Add an entry to the filesystem
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*
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* The returned element has default values inherited from the parent
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*
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* The specified mode is sanitised in that:-
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* - Bits other than the lowest nine permissions bits, the directory
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* bit (S_IFDIR) and the regular bit (S_IFREG) are cleared.
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* - S_IFREG is cleared if S_IFDIR is set
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* - S_IFREG is set if neither S_IFDIR or S_IFREG is set
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*
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* NULL is returned for one of the following conditions:-
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* - the parent does not exist
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* - the parent is not a directory
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* - the name length exceeds XFS_MAXFILENAMELEN
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* - the entry already exists
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* - memory is exhausted.
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*
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* @param xfs filesystem instance
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* @param parent_inode parent inode
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* @param name Name of entry
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* @param mode Initial mode for file.
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* @return inode, or NULL
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*/
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XFS_INODE *
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xfs_add_entry(struct xfs_fs *xfs, fuse_ino_t parent_inum,
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const char *name, mode_t mode);
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/*
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* Delete the contents of a directory
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*
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* If normal files are opened when they are deleted, the inode is not
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* released until the open count goes to zero.
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*
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* @param xfs filesystem instance
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* @param inode Reference to entry to delete
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*
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*/
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void
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xfs_remove_directory_contents(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Delete an entry from the filesystem
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*
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* If normal files are opened when they are deleted, the inode is not
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* released until the open count goes to zero.
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*
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* For directories, the contents are removed first.
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*
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* @param xfs filesystem instance
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* @param inode Reference to entry to delete
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*
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*/
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void
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xfs_remove_entry(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Get an XFS_INODE for an inum
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*
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* @param xfs filesystem instance
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* @param inum Inumber
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* @return Pointer to XFS_INODE
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*/
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XFS_INODE *
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xfs_get(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Get the full path for an inum
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*
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* The path is dynamically allocated, and must be freed after use
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*
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* @param xfs filesystem instance
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* @param inum Inumber to get path for
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* @return Full path (free after use)
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*/
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char *
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xfs_get_full_path(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Lookup a file in a directory
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*
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* @param xfs filesystem instance
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* @param inum Inumber of the directory
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* @param name Name of the file to lookup
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* @return Pointer to XFS_INODE if found
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*/
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XFS_INODE *
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xfs_lookup_in_dir(struct xfs_fs *xfs, fuse_ino_t inum, const char *name);
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/*
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* Inquires as to whether a directory is empty.
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*
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* The caller must check that the inum is actually a directory, or
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* the result is undefined.
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*
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* @param xfs filesystem instance
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* @param inum Inumber of the directory
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* @return True if the directory is empty
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*/
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int
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xfs_is_dir_empty(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Inquires as to whether an entry is under a directory.
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*
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* This can be used to check for invalid renames, where we try to
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* rename a directory into one of its sub-directories.
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*
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* Returned value means one of the following:-
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* 0 Entry is not related to the directory
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* 1 Entry is an immediate member of the directory
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* 2.. Entry is a few levels below the directory
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*
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* @param xfs filesystem instance
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* @param dir Inumber of the directory
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* @param entry Inumber of the entry
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* @return Nesting count of entry in the directory, or 0 for
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* no nesting
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*/
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unsigned int
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xfs_is_under(struct xfs_fs *xfs, fuse_ino_t dir, fuse_ino_t entry);
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/*
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* Opens a directory for reading
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*
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* @param xfs filesystem instance
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* @param dir Inumber of the directory
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* @return handle to be passed to xfs_readdir() and xfs_closedir()
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*/
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struct xfs_dir_handle *
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xfs_opendir(struct xfs_fs *xfs, fuse_ino_t dir);
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/*
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* Gets the next entry from a directory
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*
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* This function is safe to call while the filesystem is being modified.
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* Whether files added or removed from the directory in question are
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* returned or not is unspecified by this interface.
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*
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* @param xfs filesystem instance
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* @param handle Handle from xfs_opendir
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* @param off Offset (by reference). Pass in zero to get the first
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* entry. After the call, the offset is updated so that
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* the next call gets the next entry.
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*
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* @return pointer to details of file entry, or NULL if no more
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* entries are available.
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*/
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XFS_INODE *
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xfs_readdir(struct xfs_fs *xfs, struct xfs_dir_handle *handle, off_t *off);
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/*
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* Closes a directory opened for reading
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*
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* @param xfs filesystem instance
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* @param handle Earlier result of readdir() call
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*/
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void
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xfs_closedir(struct xfs_fs *xfs, struct xfs_dir_handle *handle);
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/*
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* Increment the file open count
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*
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* The file open count is used to be sure when an entry can be deleted from
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* the data structures. It allows us to remove an entry while still retaining
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* enough state to manage the file
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*
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* This call is only necessary for regular files - not directories
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*
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* @param xfs filesystem instance
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* @param inum File to increment the count of
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*/
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void
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xfs_increment_file_open_count(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Decrement the file open count
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*
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* This call will ensure that deleted inodes are cleared up at the appropriate
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* time.
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*
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* This call is only necessary for regular files - not directories
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*
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* @param xfs filesystem instance
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* @param inum File to decrement the count of
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*/
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void
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xfs_decrement_file_open_count(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Return the file open count for a regular file
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*/
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unsigned int
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xfs_get_file_open_count(struct xfs_fs *xfs, fuse_ino_t inum);
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/*
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* Deletes all redirected entries with the matching device id
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*
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* Files are deleted even if they are open
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*
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* @param device_id Device ID
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*/
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void
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xfs_delete_redirected_entries_with_device_id(struct xfs_fs *xfs,
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tui32 device_id);
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/*
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* Check an entry move will be successful
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*
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* A move will fail if:-
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* - Any of the parameters are invalid
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* - if the entry is a directory, and the new parent is below the
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* entry in the existing hierarchy.
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*
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* @param xfs filesystem instance
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* @param inum Inumber of entry
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* @param new_parent New parent
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* @param name New name
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*
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* @result != 0 if all looks OK
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*/
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int
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xfs_check_move_entry(struct xfs_fs *xfs, fuse_ino_t inum,
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fuse_ino_t new_parent_inum, const char *name);
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/*
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* Move (rename) an entry
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*
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* @param xfs filesystem instance
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* @param inum Inumber of entry
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* @param new_parent New parent
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* @param name New name
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*
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* @result 0, or a suitable errno value.
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*/
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int
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xfs_move_entry(struct xfs_fs *xfs, fuse_ino_t inum,
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fuse_ino_t new_parent_inum, const char *name);
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#endif /* XRDP_FUSE */
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#endif /* _CHANSRV_XFS */
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