a9d0ffbd0d
The next commit will make mode_t 32-bits, ino_t 64-bits, nlink_t 32-bits, and off_t 64-bits. However, in the protocol there is no room for that. When analyzing the usage of these data types we can see that of mode_t we currently use 15 bits and that future flags (if copied from NetBSD) are only of importance to VFS and not to the actual file system on disk. Therefore we can get away with keeping the protocol version of mode_t (pmode_t) 16 bits. At this point it is unlikely that MINIX will support file systems that can hold more than 2^32 files. Keeping the protocol version of ino_t (pino_t) 32-bits and exposing it as 64-bits to the rest of the system is fine. uid_t and gid_t are already 32-bits, but in behind the scenes they're 16-bits. This is sufficient since we don't support uid/gids larger than 2^16-1. off_t will become 64-bits, but the protocol had room reserved for that since it was revised years ago. So to make the difference clear between what the protocol supports and what is exposed to the system, we define protocol version of these data types. Change-Id: Ifb883aafb222142e69d6dcc3049a47170b78b3ee
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
#ifndef __PFS_INODE_H__
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#define __PFS_INODE_H__
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/* Inode table. This table holds inodes that are currently in use.
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*/
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#include <sys/queue.h>
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EXTERN struct inode {
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pmode_t i_mode; /* file type, protection, etc. */
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nlink_t i_nlinks; /* how many links to this file */
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uid_t i_uid; /* user id of the file's owner */
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gid_t i_gid; /* group number */
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off_t i_size; /* current file size in bytes */
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time_t i_atime; /* time of last access (V2 only) */
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time_t i_mtime; /* when was file data last changed */
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time_t i_ctime; /* when was inode itself changed (V2 only)*/
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/* The following items are not present on the disk. */
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dev_t i_dev; /* which device is the inode on */
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dev_t i_rdev; /* which special device is the inode on */
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ino_t i_num; /* inode number on its (minor) device */
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int i_count; /* # times inode used; 0 means slot is free */
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char i_update; /* the ATIME, CTIME, and MTIME bits are here */
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LIST_ENTRY(inode) i_hash; /* hash list */
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TAILQ_ENTRY(inode) i_unused; /* free and unused list */
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} inode[NR_INODES];
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/* list of unused/free inodes */
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EXTERN TAILQ_HEAD(unused_inodes_t, inode) unused_inodes;
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/* inode hashtable */
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EXTERN LIST_HEAD(inodelist, inode) hash_inodes[INODE_HASH_SIZE];
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#endif
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