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linux/fs/jfs/jfs_filsys.h
Mark Bellon 8fc2751beb [PATCH] disk quotas fail when /etc/mtab is symlinked to /proc/mounts 
If /etc/mtab is a regular file all of the mount options (of a file system)
are written to /etc/mtab by the mount command.  The quota tools look there
for the quota strings for their operation.  If, however, /etc/mtab is a
symlink to /proc/mounts (a "good thing" in some environments) the tools
don't write anything - they assume the kernel will take care of things.

While the quota options are sent down to the kernel via the mount system
call and the file system codes handle them properly unfortunately there is
no code to echo the quota strings into /proc/mounts and the quota tools
fail in the symlink case.

The attached patchs modify the EXT[2|3] and JFS codes to add the necessary
hooks.  The show_options function of each file system in these patches
currently deal with only those things that seemed related to quotas;
especially in the EXT3 case more can be done (later?).

Jan Kara also noted the difficulty in moving these changes above the FS
codes responding similarly to myself to Andrew's comment about possible
VFS migration. Issue summary:

 - FS codes have to process the entire string of options anyway.

 - Only FS codes that use quotas must have a show_options function (for
   quotas to work properly) however quotas are only used in a small number
   of FS.

 - Since most of the quota using FS support other options these FS codes
   should have the a show_options function to show those options - and the
   quota echoing becomes virtually negligible.

Based on feedback I have modified my patches from the original:

   JFS a missing patch has been restored to the posting
   EXT[2|3] and JFS always use the show_options function
       - Each FS has at least one FS specific option displayed
       - QUOTA output is under a CONFIG_QUOTA ifdef
       - a follow-on patch will add a multitude of options for each FS
   EXT[2|3] and JFS "quota" is treated as "usrquota"
   EXT3 journalled data check for journalled quota removed
   EXT[2|3] mount when quota specified but not compiled in

 - no changes from my original patch.  I tested the patch and the codes
   warn but

 - still mount.  With all due respection I believe the comments
   otherwise were a

 - misread of the patch.  Please reread/test and comment.  XFS patch
   removed - the XFS team already made the necessary changes EXT3 mixing
   old and new quotas are handled differently (not purely exclusive)

 - if old and new quotas for the same type are used together the old
   type is silently depricated for compatability (e.g.  usrquota and
   usrjquota)

 - mixing of old and new quotas is an error (e.g.  usrjquota and
   grpquota)

Signed-off-by: Mark Bellon <mbellon@mvista.com>
Acked-by: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: Jan Kara <jack@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 16:57:23 -07:00

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/*
* Copyright (C) International Business Machines Corp., 2000-2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _H_JFS_FILSYS
#define _H_JFS_FILSYS
/*
* jfs_filsys.h
*
* file system (implementation-dependent) constants
*
* refer to <limits.h> for system wide implementation-dependent constants
*/
/*
* file system option (superblock flag)
*/
/* mount time flag to disable journaling to disk */
#define JFS_NOINTEGRITY 0x00000010
/* mount time flags for error handling */
#define JFS_ERR_REMOUNT_RO 0x00000002 /* remount read-only */
#define JFS_ERR_CONTINUE 0x00000004 /* continue */
#define JFS_ERR_PANIC 0x00000008 /* panic */
#define JFS_USRQUOTA 0x00000010
#define JFS_GRPQUOTA 0x00000020
/* platform option (conditional compilation) */
#define JFS_AIX 0x80000000 /* AIX support */
/* POSIX name/directory support */
#define JFS_OS2 0x40000000 /* OS/2 support */
/* case-insensitive name/directory support */
#define JFS_DFS 0x20000000 /* DCE DFS LFS support */
#define JFS_LINUX 0x10000000 /* Linux support */
/* case-sensitive name/directory support */
/* directory option */
#define JFS_UNICODE 0x00000001 /* unicode name */
/* commit option */
#define JFS_COMMIT 0x00000f00 /* commit option mask */
#define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */
#define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */
#define JFS_TMPFS 0x00000400 /* temporary file system -
* do not log/commit:
*/
/* log logical volume option */
#define JFS_INLINELOG 0x00000800 /* inline log within file system */
#define JFS_INLINEMOVE 0x00001000 /* inline log being moved */
/* Secondary aggregate inode table */
#define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */
/* sparse regular file support */
#define JFS_SPARSE 0x00020000 /* sparse regular file */
/* DASD Limits F226941 */
#define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */
#define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */
/* big endian flag */
#define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */
/* Directory index */
#define JFS_DIR_INDEX 0x00200000 /* Persistant index for */
/* directory entries */
/*
* buffer cache configuration
*/
/* page size */
#ifdef PSIZE
#undef PSIZE
#endif
#define PSIZE 4096 /* page size (in byte) */
#define L2PSIZE 12 /* log2(PSIZE) */
#define POFFSET 4095 /* offset within page */
/* buffer page size */
#define BPSIZE PSIZE
/*
* fs fundamental size
*
* PSIZE >= file system block size >= PBSIZE >= DISIZE
*/
#define PBSIZE 512 /* physical block size (in byte) */
#define L2PBSIZE 9 /* log2(PBSIZE) */
#define DISIZE 512 /* on-disk inode size (in byte) */
#define L2DISIZE 9 /* log2(DISIZE) */
#define IDATASIZE 256 /* inode inline data size */
#define IXATTRSIZE 128 /* inode inline extended attribute size */
#define XTPAGE_SIZE 4096
#define log2_PAGESIZE 12
#define IAG_SIZE 4096
#define IAG_EXTENT_SIZE 4096
#define INOSPERIAG 4096 /* number of disk inodes per iag */
#define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */
#define INOSPEREXT 32 /* number of disk inode per extent */
#define L2INOSPEREXT 5 /* l2 number of disk inode per extent */
#define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */
#define INOSPERPAGE 8 /* number of disk inodes per 4K page */
#define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */
#define IAGFREELIST_LWM 64
#define INODE_EXTENT_SIZE IXSIZE /* inode extent size */
#define NUM_INODE_PER_EXTENT INOSPEREXT
#define NUM_INODE_PER_IAG INOSPERIAG
#define MINBLOCKSIZE 512
#define MAXBLOCKSIZE 4096
#define MAXFILESIZE ((s64)1 << 52)
#define JFS_LINK_MAX 0xffffffff
/* Minimum number of bytes supported for a JFS partition */
#define MINJFS (0x1000000)
#define MINJFSTEXT "16"
/*
* file system block size -> physical block size
*/
#define LBOFFSET(x) ((x) & (PBSIZE - 1))
#define LBNUMBER(x) ((x) >> L2PBSIZE)
#define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
#define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
/* size in byte -> last page number */
#define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) )
/* size in byte -> last file system block number */
#define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
/*
* fixed physical block address (physical block size = 512 byte)
*
* NOTE: since we can't guarantee a physical block size of 512 bytes the use of
* these macros should be removed and the byte offset macros used instead.
*/
#define SUPER1_B 64 /* primary superblock */
#define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */
#define AITBL_B (AIMAP_B + 16) /*
* 1st extent of aggregate inode table
*/
#define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */
#define BMAP_B (SUPER2_B + 8) /* block allocation map */
/*
* SIZE_OF_SUPER defines the total amount of space reserved on disk for the
* superblock. This is not the same as the superblock structure, since all of
* this space is not currently being used.
*/
#define SIZE_OF_SUPER PSIZE
/*
* SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
*/
#define SIZE_OF_AG_TABLE PSIZE
/*
* SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
* the inode allocation map (to hold iag)
*/
#define SIZE_OF_MAP_PAGE PSIZE
/*
* fixed byte offset address
*/
#define SUPER1_OFF 0x8000 /* primary superblock */
#define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER)
/*
* Control page of aggregate inode map
* followed by 1st extent of map
*/
#define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
/*
* 1st extent of aggregate inode table
*/
#define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE)
/*
* secondary superblock
*/
#define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER)
/*
* block allocation map
*/
/*
* The following macro is used to indicate the number of reserved disk blocks at
* the front of an aggregate, in terms of physical blocks. This value is
* currently defined to be 32K. This turns out to be the same as the primary
* superblock's address, since it directly follows the reserved blocks.
*/
#define AGGR_RSVD_BLOCKS SUPER1_B
/*
* The following macro is used to indicate the number of reserved bytes at the
* front of an aggregate. This value is currently defined to be 32K. This
* turns out to be the same as the primary superblock's byte offset, since it
* directly follows the reserved blocks.
*/
#define AGGR_RSVD_BYTES SUPER1_OFF
/*
* The following macro defines the byte offset for the first inode extent in
* the aggregate inode table. This allows us to find the self inode to find the
* rest of the table. Currently this value is 44K.
*/
#define AGGR_INODE_TABLE_START AITBL_OFF
/*
* fixed reserved inode number
*/
/* aggregate inode */
#define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */
#define AGGREGATE_I 1 /* aggregate inode map inode */
#define BMAP_I 2 /* aggregate block allocation map inode */
#define LOG_I 3 /* aggregate inline log inode */
#define BADBLOCK_I 4 /* aggregate bad block inode */
#define FILESYSTEM_I 16 /* 1st/only fileset inode in ait:
* fileset inode map inode
*/
/* per fileset inode */
#define FILESET_RSVD_I 0 /* fileset inode (reserved) */
#define FILESET_EXT_I 1 /* fileset inode extension */
#define ROOT_I 2 /* fileset root inode */
#define ACL_I 3 /* fileset ACL inode */
#define FILESET_OBJECT_I 4 /* the first fileset inode available for a file
* or directory or link...
*/
#define FIRST_FILESET_INO 16 /* the first aggregate inode which describes
* an inode. (To fsck this is also the first
* inode in part 2 of the agg inode table.)
*/
/*
* directory configuration
*/
#define JFS_NAME_MAX 255
#define JFS_PATH_MAX BPSIZE
/*
* file system state (superblock state)
*/
#define FM_CLEAN 0x00000000 /* file system is unmounted and clean */
#define FM_MOUNT 0x00000001 /* file system is mounted cleanly */
#define FM_DIRTY 0x00000002 /* file system was not unmounted and clean
* when mounted or
* commit failure occurred while being mounted:
* fsck() must be run to repair
*/
#define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed:
* fsck() must be run to repair
*/
#define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */
#endif /* _H_JFS_FILSYS */
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