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.
35 lines
1.4 KiB
C
35 lines
1.4 KiB
C
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EXTERN struct vnode {
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endpoint_t v_fs_e; /* FS process' endpoint number */
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endpoint_t v_mapfs_e; /* mapped FS process' endpoint number */
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ino_t v_inode_nr; /* inode number on its (minor) device */
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ino_t v_mapinode_nr; /* mapped inode number of mapped FS. */
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mode_t v_mode; /* file type, protection, etc. */
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uid_t v_uid; /* uid of inode. */
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gid_t v_gid; /* gid of inode. */
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off_t v_size; /* current file size in bytes */
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int v_ref_count; /* # times vnode used; 0 means slot is free */
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int v_fs_count; /* # reference at the underlying FS */
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int v_mapfs_count; /* # reference at the underlying mapped FS */
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#if 0
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int v_ref_check; /* for consistency checks */
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#endif
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char v_pipe; /* set to I_PIPE if pipe */
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off_t v_pipe_rd_pos;
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off_t v_pipe_wr_pos;
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endpoint_t v_bfs_e; /* endpoint number for the FS proces in case
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of a block special file */
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dev_t v_dev; /* device number on which the corresponding
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inode resides */
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dev_t v_sdev; /* device number for special files */
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struct vmnt *v_vmnt; /* vmnt object of the partition */
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} vnode[NR_VNODES];
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#define NIL_VNODE (struct vnode *) 0 /* indicates absence of vnode slot */
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/* Field values. */
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#define NO_PIPE 0 /* i_pipe is NO_PIPE if inode is not a pipe */
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#define I_PIPE 1 /* i_pipe is I_PIPE if inode is a pipe */
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