958b25be50
- Revise VFS-FS protocol and update VFS/MFS/ISOFS accordingly.
- Clean up MFS by removing old, dead code (backwards compatibility is broken by
the new VFS-FS protocol, anyway) and rewrite other parts. Also, make sure all
functions have proper banners and prototypes.
- VFS should always provide a (syntactically) valid path to the FS; no need for
the FS to do sanity checks when leaving/entering mount points.
- Fix several bugs in MFS:
- Several path lookup bugs in MFS.
- A link can be too big for the path buffer.
- A mountpoint can become inaccessible when the creation of a new inode
fails, because the inode already exists and is a mountpoint.
- Introduce support for supplemental groups.
- Add test 46 to test supplemental group functionality (and removed obsolete
suppl. tests from test 2).
- Clean up VFS (not everything is done yet).
- ISOFS now opens device read-only. This makes the -r flag in the mount command
unnecessary (but will still report to be mounted read-write).
- Introduce PipeFS. PipeFS is a new FS that handles all anonymous and
named pipes. However, named pipes still reside on the (M)FS, as they are part
of the file system on disk. To make this work VFS now has a concept of
'mapped' inodes, which causes read, write, truncate and stat requests to be
redirected to the mapped FS, and all other requests to the original FS.
80 lines
3.1 KiB
C
80 lines
3.1 KiB
C
/* The <sys/stat.h> header defines a struct that is used in the stat() and
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* fstat functions. The information in this struct comes from the i-node of
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* some file. These calls are the only approved way to inspect i-nodes.
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*/
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#ifndef _STAT_H
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#define _STAT_H
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#ifndef _TYPES_H
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#include <minix/types.h>
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#endif
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struct stat {
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dev_t st_dev; /* major/minor device number */
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ino_t st_ino; /* i-node number */
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mode_t st_mode; /* file mode, protection bits, etc. */
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short int st_nlink; /* # links; TEMPORARY HACK: should be nlink_t*/
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uid_t st_uid; /* uid of the file's owner */
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short int st_gid; /* gid; TEMPORARY HACK: should be gid_t */
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dev_t st_rdev;
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off_t st_size; /* file size */
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time_t st_atime; /* time of last access */
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time_t st_mtime; /* time of last data modification */
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time_t st_ctime; /* time of last file status change */
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};
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/* Traditional mask definitions for st_mode. */
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#define S_IFMT 0170000 /* type of file */
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#define S_IFLNK 0120000 /* symbolic link */
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#define S_IFREG 0100000 /* regular */
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#define S_IFBLK 0060000 /* block special */
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#define S_IFDIR 0040000 /* directory */
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#define S_IFCHR 0020000 /* character special */
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#define S_IFIFO 0010000 /* this is a FIFO */
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#define S_ISUID 0004000 /* set user id on execution */
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#define S_ISGID 0002000 /* set group id on execution */
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#define S_ISVTX 0001000 /* save swapped text even after use */
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/* POSIX masks for st_mode. */
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#define S_IRWXU 00700 /* owner: rwx------ */
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#define S_IRUSR 00400 /* owner: r-------- */
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#define S_IWUSR 00200 /* owner: -w------- */
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#define S_IXUSR 00100 /* owner: --x------ */
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#define S_IRWXG 00070 /* group: ---rwx--- */
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#define S_IRGRP 00040 /* group: ---r----- */
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#define S_IWGRP 00020 /* group: ----w---- */
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#define S_IXGRP 00010 /* group: -----x--- */
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#define S_IRWXO 00007 /* others: ------rwx */
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#define S_IROTH 00004 /* others: ------r-- */
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#define S_IWOTH 00002 /* others: -------w- */
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#define S_IXOTH 00001 /* others: --------x */
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/* Synonyms for above. */
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#define S_IEXEC S_IXUSR
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#define S_IWRITE S_IWUSR
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#define S_IREAD S_IRUSR
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/* The following macros test st_mode (from POSIX Sec. 5.6.1.1). */
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#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) /* is a reg file */
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#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) /* is a directory */
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#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR) /* is a char spec */
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#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK) /* is a block spec */
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#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) /* is a symlink */
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#define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO) /* is a pipe/FIFO */
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/* Function Prototypes. */
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_PROTOTYPE( int chmod, (const char *_path, _mnx_Mode_t _mode) );
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_PROTOTYPE( int fchmod, (int fd, _mnx_Mode_t _mode) );
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_PROTOTYPE( int fstat, (int _fildes, struct stat *_buf) );
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_PROTOTYPE( int mkdir, (const char *_path, _mnx_Mode_t _mode) );
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_PROTOTYPE( int mkfifo, (const char *_path, _mnx_Mode_t _mode) );
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_PROTOTYPE( int stat, (const char *_path, struct stat *_buf) );
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_PROTOTYPE( mode_t umask, (_mnx_Mode_t _cmask) );
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/* Open Group Base Specifications Issue 6 (not complete) */
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_PROTOTYPE( int lstat, (const char *_path, struct stat *_buf) );
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#endif /* _STAT_H */
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