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authorAdrian Bunk <bunk@stusta.de>2006-12-06 23:40:01 -0500
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 11:39:44 -0500
commit3982cd99c30285ebc71d405cd8530a3dfb7265de (patch)
tree288eb99e0c77acb7c58f1820d5579ce161e6a88e /fs/sysv
parentf1a60dbf68061e5a5364cbc723786b355637ffd3 (diff)
[PATCH] fs/sysv/: doc cleanup
Remove two different changelog files from fs/sysv/ and merges the INTRO file into Documentation/filesystems/sysv-fs.txt Signed-off-by: Adrian Bunk <bunk@stusta.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/sysv')
-rw-r--r--fs/sysv/CHANGES60
-rw-r--r--fs/sysv/ChangeLog106
-rw-r--r--fs/sysv/INTRO182
3 files changed, 0 insertions, 348 deletions
diff --git a/fs/sysv/CHANGES b/fs/sysv/CHANGES
deleted file mode 100644
index 66ea6e92be66..000000000000
--- a/fs/sysv/CHANGES
+++ /dev/null
@@ -1,60 +0,0 @@
1Mon, 15 Dec 1997 Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
2 * namei.c: struct sysv_dir_inode_operations updated to use dentries.
3
4Fri, 23 Jan 1998 Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
5 * inode.c: corrected 1 track offset setting (in sb->sv_block_base).
6 Originally it was overridden (by setting to zero)
7 in detected_[xenix,sysv4,sysv2,coherent]. Thanks
8 to Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
9 for identifying the problem.
10
11Tue, 27 Jan 1998 Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
12 * inode.c: added 2048-byte block support to SystemV FS.
13 Merged detected_bs[512,1024,2048]() into one function:
14 void detected_bs (u_char type, struct super_block *sb).
15 Thanks to Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
16 for the patch.
17
18Wed, 4 Feb 1998 Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
19 * namei.c: removed static subdir(); is_subdir() from dcache.c
20 is used instead. Cosmetic changes.
21
22Thu, 3 Dec 1998 Al Viro (viro@parcelfarce.linux.theplanet.co.uk)
23 * namei.c (sysv_rmdir):
24 Bugectomy: old check for victim being busy
25 (inode->i_count) wasn't replaced (with checking
26 dentry->d_count) and escaped Linus in the last round
27 of changes. Shot and buried.
28
29Wed, 9 Dec 1998 AV
30 * namei.c (do_sysv_rename):
31 Fixed incorrect check for other owners + race.
32 Removed checks that went to VFS.
33 * namei.c (sysv_unlink):
34 Removed checks that went to VFS.
35
36Thu, 10 Dec 1998 AV
37 * namei.c (do_mknod):
38 Removed dead code - mknod is never asked to
39 create a symlink or directory. Incidentially,
40 it wouldn't do it right if it would be called.
41
42Sat, 26 Dec 1998 KGB
43 * inode.c (detect_sysv4):
44 Added detection of expanded s_type field (0x10,
45 0x20 and 0x30). Forced read-only access in this case.
46
47Sun, 21 Mar 1999 AV
48 * namei.c (sysv_link):
49 Fixed i_count usage that resulted in dcache corruption.
50 * inode.c:
51 Filled ->delete_inode() method with sysv_delete_inode().
52 sysv_put_inode() is gone, as it tried to do ->delete_
53 _inode()'s job.
54 * ialloc.c: (sysv_free_inode):
55 Fixed race.
56
57Sun, 30 Apr 1999 AV
58 * namei.c (sysv_mknod):
59 Removed dead code (S_IFREG case is now passed to
60 ->create() by VFS).
diff --git a/fs/sysv/ChangeLog b/fs/sysv/ChangeLog
deleted file mode 100644
index f403f8b91b80..000000000000
--- a/fs/sysv/ChangeLog
+++ /dev/null
@@ -1,106 +0,0 @@
1Thu Feb 14 2002 Andrew Morton <akpm@zip.com.au>
2
3 * dir_commit_chunk(): call writeout_one_page() as well as
4 waitfor_one_page() for IS_SYNC directories, so that we
5 actually do sync the directory. (forward-port from 2.4).
6
7Thu Feb 7 2002 Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>
8
9 * super.c: switched to ->get_sb()
10 * ChangeLog: fixed dates ;-)
11
122002-01-24 David S. Miller <davem@redhat.com>
13
14 * inode.c: Include linux/init.h
15
16Mon Jan 21 2002 Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>
17 * ialloc.c (sysv_new_inode): zero SYSV_I(inode)->i_data out.
18 * i_vnode renamed to vfs_inode. Sorry, but let's keep that
19 consistent.
20
21Sat Jan 19 2002 Christoph Hellwig <hch@infradead.org>
22
23 * include/linux/sysv_fs.h (SYSV_I): Get fs-private inode data using
24 list_entry() instead of inode->u.
25 * include/linux/sysv_fs_i.h: Add 'struct inode i_vnode' field to
26 sysv_inode_info structure.
27 * inode.c: Include <linux/slab.h>, implement alloc_inode/destroy_inode
28 sop methods, add infrastructure for per-fs inode slab cache.
29 * super.c (init_sysv_fs): Initialize inode cache, recover properly
30 in the case of failed register_filesystem for V7.
31 (exit_sysv_fs): Destroy inode cache.
32
33Sat Jan 19 2002 Christoph Hellwig <hch@infradead.org>
34
35 * include/linux/sysv_fs.h: Include <linux/sysv_fs_i.h>, declare SYSV_I().
36 * dir.c (sysv_find_entry): Use SYSV_I() instead of ->u.sysv_i to
37 access fs-private inode data.
38 * ialloc.c (sysv_new_inode): Likewise.
39 * inode.c (sysv_read_inode): Likewise.
40 (sysv_update_inode): Likewise.
41 * itree.c (get_branch): Likewise.
42 (sysv_truncate): Likewise.
43 * symlink.c (sysv_readlink): Likewise.
44 (sysv_follow_link): Likewise.
45
46Fri Jan 4 2002 Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>
47
48 * ialloc.c (sysv_free_inode): Use sb->s_id instead of bdevname().
49 * inode.c (sysv_read_inode): Likewise.
50 (sysv_update_inode): Likewise.
51 (sysv_sync_inode): Likewise.
52 * super.c (detect_sysv): Likewise.
53 (complete_read_super): Likewise.
54 (sysv_read_super): Likewise.
55 (v7_read_super): Likewise.
56
57Sun Dec 30 2001 Manfred Spraul <manfred@colorfullife.com>
58
59 * dir.c (dir_commit_chunk): Do not set dir->i_version.
60 (sysv_readdir): Likewise.
61
62Thu Dec 27 2001 Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>
63
64 * itree.c (get_block): Use map_bh() to fill out bh_result.
65
66Tue Dec 25 2001 Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>
67
68 * super.c (sysv_read_super): Use sb_set_blocksize() to set blocksize.
69 (v7_read_super): Likewise.
70
71Tue Nov 27 2001 Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>
72
73 * itree.c (get_block): Change type for iblock argument to sector_t.
74 * super.c (sysv_read_super): Set s_blocksize early.
75 (v7_read_super): Likewise.
76 * balloc.c (sysv_new_block): Use sb_bread(). instead of bread().
77 (sysv_count_free_blocks): Likewise.
78 * ialloc.c (sysv_raw_inode): Likewise.
79 * itree.c (get_branch): Likewise.
80 (free_branches): Likewise.
81 * super.c (sysv_read_super): Likewise.
82 (v7_read_super): Likewise.
83
84Sat Dec 15 2001 Christoph Hellwig <hch@infradead.org>
85
86 * inode.c (sysv_read_inode): Mark inode as bad in case of failure.
87 * super.c (complete_read_super): Check for bad root inode.
88
89Wed Nov 21 2001 Andrew Morton <andrewm@uow.edu.au>
90
91 * file.c (sysv_sync_file): Call fsync_inode_data_buffers.
92
93Fri Oct 26 2001 Christoph Hellwig <hch@infradead.org>
94
95 * dir.c, ialloc.c, namei.c, include/linux/sysv_fs_i.h:
96 Implement per-Inode lookup offset cache.
97 Modelled after Ted's ext2 patch.
98
99Fri Oct 26 2001 Christoph Hellwig <hch@infradead.org>
100
101 * inode.c, super.c, include/linux/sysv_fs.h,
102 include/linux/sysv_fs_sb.h:
103 Remove symlink faking. Noone really wants to use these as
104 linux filesystems and native OSes don't support it anyway.
105
106
diff --git a/fs/sysv/INTRO b/fs/sysv/INTRO
deleted file mode 100644
index de4e4d17cac6..000000000000
--- a/fs/sysv/INTRO
+++ /dev/null
@@ -1,182 +0,0 @@
1This is the implementation of the SystemV/Coherent filesystem for Linux.
2It grew out of separate filesystem implementations
3
4 Xenix FS Doug Evans <dje@cygnus.com> June 1992
5 SystemV FS Paul B. Monday <pmonday@eecs.wsu.edu> March-June 1993
6 Coherent FS B. Haible <haible@ma2s2.mathematik.uni-karlsruhe.de> June 1993
7
8and was merged together in July 1993.
9
10These filesystems are rather similar. Here is a comparison with Minix FS:
11
12* Linux fdisk reports on partitions
13 - Minix FS 0x81 Linux/Minix
14 - Xenix FS ??
15 - SystemV FS ??
16 - Coherent FS 0x08 AIX bootable
17
18* Size of a block or zone (data allocation unit on disk)
19 - Minix FS 1024
20 - Xenix FS 1024 (also 512 ??)
21 - SystemV FS 1024 (also 512 and 2048)
22 - Coherent FS 512
23
24* General layout: all have one boot block, one super block and
25 separate areas for inodes and for directories/data.
26 On SystemV Release 2 FS (e.g. Microport) the first track is reserved and
27 all the block numbers (including the super block) are offset by one track.
28
29* Byte ordering of "short" (16 bit entities) on disk:
30 - Minix FS little endian 0 1
31 - Xenix FS little endian 0 1
32 - SystemV FS little endian 0 1
33 - Coherent FS little endian 0 1
34 Of course, this affects only the file system, not the data of files on it!
35
36* Byte ordering of "long" (32 bit entities) on disk:
37 - Minix FS little endian 0 1 2 3
38 - Xenix FS little endian 0 1 2 3
39 - SystemV FS little endian 0 1 2 3
40 - Coherent FS PDP-11 2 3 0 1
41 Of course, this affects only the file system, not the data of files on it!
42
43* Inode on disk: "short", 0 means non-existent, the root dir ino is:
44 - Minix FS 1
45 - Xenix FS, SystemV FS, Coherent FS 2
46
47* Maximum number of hard links to a file:
48 - Minix FS 250
49 - Xenix FS ??
50 - SystemV FS ??
51 - Coherent FS >=10000
52
53* Free inode management:
54 - Minix FS a bitmap
55 - Xenix FS, SystemV FS, Coherent FS
56 There is a cache of a certain number of free inodes in the super-block.
57 When it is exhausted, new free inodes are found using a linear search.
58
59* Free block management:
60 - Minix FS a bitmap
61 - Xenix FS, SystemV FS, Coherent FS
62 Free blocks are organized in a "free list". Maybe a misleading term,
63 since it is not true that every free block contains a pointer to
64 the next free block. Rather, the free blocks are organized in chunks
65 of limited size, and every now and then a free block contains pointers
66 to the free blocks pertaining to the next chunk; the first of these
67 contains pointers and so on. The list terminates with a "block number"
68 0 on Xenix FS and SystemV FS, with a block zeroed out on Coherent FS.
69
70* Super-block location:
71 - Minix FS block 1 = bytes 1024..2047
72 - Xenix FS block 1 = bytes 1024..2047
73 - SystemV FS bytes 512..1023
74 - Coherent FS block 1 = bytes 512..1023
75
76* Super-block layout:
77 - Minix FS
78 unsigned short s_ninodes;
79 unsigned short s_nzones;
80 unsigned short s_imap_blocks;
81 unsigned short s_zmap_blocks;
82 unsigned short s_firstdatazone;
83 unsigned short s_log_zone_size;
84 unsigned long s_max_size;
85 unsigned short s_magic;
86 - Xenix FS, SystemV FS, Coherent FS
87 unsigned short s_firstdatazone;
88 unsigned long s_nzones;
89 unsigned short s_fzone_count;
90 unsigned long s_fzones[NICFREE];
91 unsigned short s_finode_count;
92 unsigned short s_finodes[NICINOD];
93 char s_flock;
94 char s_ilock;
95 char s_modified;
96 char s_rdonly;
97 unsigned long s_time;
98 short s_dinfo[4]; -- SystemV FS only
99 unsigned long s_free_zones;
100 unsigned short s_free_inodes;
101 short s_dinfo[4]; -- Xenix FS only
102 unsigned short s_interleave_m,s_interleave_n; -- Coherent FS only
103 char s_fname[6];
104 char s_fpack[6];
105 then they differ considerably:
106 Xenix FS
107 char s_clean;
108 char s_fill[371];
109 long s_magic;
110 long s_type;
111 SystemV FS
112 long s_fill[12 or 14];
113 long s_state;
114 long s_magic;
115 long s_type;
116 Coherent FS
117 unsigned long s_unique;
118 Note that Coherent FS has no magic.
119
120* Inode layout:
121 - Minix FS
122 unsigned short i_mode;
123 unsigned short i_uid;
124 unsigned long i_size;
125 unsigned long i_time;
126 unsigned char i_gid;
127 unsigned char i_nlinks;
128 unsigned short i_zone[7+1+1];
129 - Xenix FS, SystemV FS, Coherent FS
130 unsigned short i_mode;
131 unsigned short i_nlink;
132 unsigned short i_uid;
133 unsigned short i_gid;
134 unsigned long i_size;
135 unsigned char i_zone[3*(10+1+1+1)];
136 unsigned long i_atime;
137 unsigned long i_mtime;
138 unsigned long i_ctime;
139
140* Regular file data blocks are organized as
141 - Minix FS
142 7 direct blocks
143 1 indirect block (pointers to blocks)
144 1 double-indirect block (pointer to pointers to blocks)
145 - Xenix FS, SystemV FS, Coherent FS
146 10 direct blocks
147 1 indirect block (pointers to blocks)
148 1 double-indirect block (pointer to pointers to blocks)
149 1 triple-indirect block (pointer to pointers to pointers to blocks)
150
151* Inode size, inodes per block
152 - Minix FS 32 32
153 - Xenix FS 64 16
154 - SystemV FS 64 16
155 - Coherent FS 64 8
156
157* Directory entry on disk
158 - Minix FS
159 unsigned short inode;
160 char name[14/30];
161 - Xenix FS, SystemV FS, Coherent FS
162 unsigned short inode;
163 char name[14];
164
165* Dir entry size, dir entries per block
166 - Minix FS 16/32 64/32
167 - Xenix FS 16 64
168 - SystemV FS 16 64
169 - Coherent FS 16 32
170
171* How to implement symbolic links such that the host fsck doesn't scream:
172 - Minix FS normal
173 - Xenix FS kludge: as regular files with chmod 1000
174 - SystemV FS ??
175 - Coherent FS kludge: as regular files with chmod 1000
176
177
178Notation: We often speak of a "block" but mean a zone (the allocation unit)
179and not the disk driver's notion of "block".
180
181
182Bruno Haible <haible@ma2s2.mathematik.uni-karlsruhe.de>
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-09 22:39:04 -0500