0458054c4e
description:
How it works:
--
Basically ifs is a copy of ffs, overriding some vfs/vnops. (Yes, hack.)
I didn't see the need in duplicating all of sys/ufs/ffs to get this
off the ground.
File creation is done through a special file - 'newfile' . When newfile
is called, the system allocates and returns an inode. Note that newfile
is done in a cloning fashion:
fd = open("newfile", O_CREAT|O_RDWR, 0644);
fstat(fd, &st);
printf("new file is %d\n", (int)st.st_ino);
Once you have created a file, you can open() and unlink() it by its returned
inode number retrieved from the stat call, ie:
fd = open("5", O_RDWR);
The creation permissions depend entirely if you have write access to the
root directory of the filesystem.
To get the list of currently allocated inodes, VOP_READDIR has been added
which returns a directory listing of those currently allocated.
--
What this entails:
* patching conf/files and conf/options to include IFS as a new compile
option (and since ifs depends upon FFS, include the FFS routines)
* An entry in i386/conf/NOTES indicating IFS exists and where to go for
an explanation
* Unstaticize a couple of routines in src/sys/ufs/ffs/ which the IFS
routines require (ffs_mount() and ffs_reload())
* a new bunch of routines in src/sys/ufs/ifs/ which implement the IFS
routines. IFS replaces some of the vfsops, and a handful of vnops -
most notably are VFS_VGET(), VOP_LOOKUP(), VOP_UNLINK() and VOP_READDIR().
Any other directory operation is marked as invalid.
What this results in:
* an IFS partition's create permissions are controlled by the perm/ownership of
the root mount point, just like a normal directory
* Each inode has perm and ownership too
* IFS does *NOT* mean an FFS partition can be opened per inode. This is a
completely seperate filesystem here
* Softupdates doesn't work with IFS, and really I don't think it needs it.
Besides, fsck's are FAST. (Try it :-)
* Inodes 0 and 1 aren't allocatable because they are special (dump/swap IIRC).
Inode 2 isn't allocatable since UFS/FFS locks all inodes in the system against
this particular inode, and unravelling THAT code isn't trivial. Therefore,
useful inodes start at 3.
Enjoy, and feedback is definitely appreciated!
472 lines
12 KiB
Plaintext
472 lines
12 KiB
Plaintext
# $FreeBSD$
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#
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# On the handling of kernel options
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#
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# All kernel options should be listed in LINT, with suitable
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# descriptions. Negative options (options that make some code not
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# compile) should be commented out; LINT should compile as much code
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# as possible. Try to structure option-using code so that a single
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# option only switch code on, or only switch code off, to make it
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# possible to have a full compile-test. If necessary, you can check
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# for COMPILING_LINT to get maximum code coverage.
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#
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# All new options shall also be listed in either "conf/options" or
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# "<machine>/conf/options.<machine>". Options that affect a single
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# source-file <xxx>.[c|s] should be directed into "opt_<xxx>.h", while
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# options that affect multiple files should either go in
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# "opt_global.h" if this is a kernel-wide option (used just about
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# everywhere), or in "opt_<option-name-in-lower-case>.h" if it affect
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# only some files. Note that the effect of listing only an option
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# without a header-file-name in conf/options (and cousins) is that the
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# last convention is followed.
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#
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# This handling scheme is not yet fully implemented.
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#
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#
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# Format of this file:
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# Option name filename
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#
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# If filename is missing, the default is
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# opt_<name-of-option-in-lower-case>.h
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# Adaptec aic7xxx SCSI controller options
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AHC_ALLOW_MEMIO opt_aic7xxx.h # Allow PCI devices to use memory
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# mapped I/O
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AHC_TMODE_ENABLE opt_aic7xxx.h # Bitmap of units to enable
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# targetmode operations.
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AHC_DUMP_EEPROM opt_aic7xxx.h # Dump the contents of our
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# configuration prom.
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ADW_ALLOW_MEMIO opt_adw.h # Allow PCI devices to use memory
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# mapped I/O
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# Miscellaneous options.
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COMPAT_43 opt_compat.h
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COMPAT_SUNOS opt_compat.h
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COMPILING_LINT opt_global.h
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CY_PCI_FASTINTR
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DDB
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DDB_UNATTENDED opt_ddb.h
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GDB_REMOTE_CHAT opt_ddb.h
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DEVFS
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HW_WDOG
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KTRACE
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MD_NSECT opt_md.h
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MD_ROOT opt_md.h
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MD_ROOT_SIZE opt_md.h
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MFS_ROOT opt_mfs.h
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MFS_ROOT_SIZE opt_mfs.h
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NTIMECOUNTER opt_ntp.h
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NSWAPDEV opt_swap.h
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PPS_SYNC opt_ntp.h
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QUOTA
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SPX_HACK
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SUIDDIR opt_suiddir.h
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SYSVMSG opt_sysvipc.h
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SYSVSEM opt_sysvipc.h
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SYSVSHM opt_sysvipc.h
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SHMALL opt_sysvipc.h
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SHMMAX opt_sysvipc.h
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SHMMAXPGS opt_sysvipc.h
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SHMMIN opt_sysvipc.h
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SHMMNI opt_sysvipc.h
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SHMSEG opt_sysvipc.h
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SEMMAP opt_sysvipc.h
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SEMMNI opt_sysvipc.h
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SEMMNS opt_sysvipc.h
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SEMMNU opt_sysvipc.h
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SEMMSL opt_sysvipc.h
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SEMOPM opt_sysvipc.h
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SEMUME opt_sysvipc.h
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MSGMNB opt_sysvipc.h
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MSGMNI opt_sysvipc.h
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MSGSEG opt_sysvipc.h
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MSGSSZ opt_sysvipc.h
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MSGTQL opt_sysvipc.h
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UCONSOLE
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VFS_AIO
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# POSIX kernel options
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P1003_1B opt_posix.h
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_KPOSIX_PRIORITY_SCHEDULING opt_posix.h
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_KPOSIX_VERSION opt_posix.h
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# TrustedBSD and POSIX.1e Kernel Options
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CAPABILITIES opt_cap.h
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# Do we want the config file compiled into the kernel?
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INCLUDE_CONFIG_FILE opt_config.h
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# Options for static file systems. These should only be used at config
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# time, since the corresponding lkms cannot work if there are any static
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# dependencies. Unusability is enforced by hiding the defines for the
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# options in a never-included header.
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EXT2FS opt_dontuse.h
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FDESC opt_dontuse.h
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KERNFS opt_dontuse.h
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MFS opt_dontuse.h
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MSDOSFS opt_dontuse.h
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NULLFS opt_dontuse.h
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PORTAL opt_dontuse.h
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PROCFS opt_dontuse.h
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UMAPFS opt_dontuse.h
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NTFS opt_dontuse.h
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# These static filesystems has one slightly bogus static dependency in
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# sys/i386/i386/autoconf.c. If any of these filesystems are
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# statically compiled into the kernel, code for mounting them as root
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# filesystems will be enabled - but look below. Boot-code is purposely
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# unavailable for the LKM-based versions.
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CODA
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CD9660
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FFS
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IFS
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NFS
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NWFS
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# If you are following the conditions in the copyright,
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# you can enable soft-updates which will speed up a lot of thigs
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# and make the system safer from crashes at the same time.
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# otherwise a STUB module will be compiled in.
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SOFTUPDATES opt_ffs.h
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# Enabling this option turns on support for extended attributes
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# in FFS, which can be used to support high security configurations
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# as well as new file system features.
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FFS_EXTATTR opt_ffs.h
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# The above static dependencies are planned removed, with a
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# <filesystem>_ROOT option to control if it usable as root. This list
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# allows these options to be present in config files already (though
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# they won't make any difference yet).
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CD9660_ROOT opt_cd9660.h
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FFS_ROOT opt_ffs.h
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NFS_ROOT opt_nfsroot.h
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# The union static file system has bogus static dependencies, so it isn't
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# hidden yet.
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UNION
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# Options used only in param.c.
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HZ opt_param.h
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MAXFILES opt_param.h
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MAXUSERS opt_param.h
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NBUF opt_param.h
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NMBCLUSTERS opt_param.h
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NSFBUFS opt_param.h
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# Generic SCSI options.
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CAM_MAX_HIGHPOWER opt_cam.h
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CAMDEBUG opt_cam.h
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CAM_DEBUG_DELAY opt_cam.h
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CAM_DEBUG_BUS opt_cam.h
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CAM_DEBUG_TARGET opt_cam.h
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CAM_DEBUG_LUN opt_cam.h
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CAM_DEBUG_FLAGS opt_cam.h
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SCSI_DELAY opt_scsi.h
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SCSI_NO_SENSE_STRINGS opt_scsi.h
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SCSI_NO_OP_STRINGS opt_scsi.h
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# Options used only in cam/scsi/scsi_cd.c
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CHANGER_MIN_BUSY_SECONDS opt_cd.h
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CHANGER_MAX_BUSY_SECONDS opt_cd.h
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# Options used only in cam/scsi/scsi_sa.c.
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SA_SPACE_TIMEOUT opt_sa.h
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SA_REWIND_TIMEOUT opt_sa.h
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SA_ERASE_TIMEOUT opt_sa.h
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SA_1FM_AT_EOD opt_sa.h
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# Options used only in cam/scsi/scsi_pt.c
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SCSI_PT_DEFAULT_TIMEOUT opt_pt.h
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# Options used only in cam/scsi/scsi_ses.c
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SES_ENABLE_PASSTHROUGH opt_ses.h
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# Options used in dev/sym/ (Symbios SCSI driver).
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SYM_SETUP_LP_PROBE_MAP opt_sym.h #-Low Priority Probe Map (bits)
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# Allows the ncr to take precedence
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# 1 (1<<0) -> 810a, 860
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# 2 (1<<1) -> 825a, 875, 885, 895
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# 4 (1<<2) -> 895a, 896, 1510d
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SYM_SETUP_SCSI_DIFF opt_sym.h #-HVD support for 825a, 875, 885
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# disabled:0 (default), enabled:1
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SYM_SETUP_PCI_PARITY opt_sym.h #-PCI parity checking
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# disabled:0, enabled:1 (default)
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SYM_SETUP_MAX_LUN opt_sym.h #-Number of LUNs supported
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# default:8, range:[1..64]
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# Options used only in pci/ncr.c
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SCSI_NCR_DEBUG opt_ncr.h
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SCSI_NCR_MAX_SYNC opt_ncr.h
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SCSI_NCR_MAX_WIDE opt_ncr.h
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SCSI_NCR_MYADDR opt_ncr.h
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# Options used only in pci/isp_pci.c
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ISP_TARGET_MODE opt_isp.h
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# Options used in the 'ata' ATA/ATAPI driver
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ATA_STATIC_ID opt_ata.h
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ATA_ENABLE_ATAPI_DMA opt_ata.h
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ATA_ENABLE_TAGS opt_ata.h
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# Resource limits.
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DFLDSIZ opt_rlimit.h
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MAXDSIZ opt_rlimit.h
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# Net stuff.
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ACCEPT_FILTER_DATA
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ACCEPT_FILTER_HTTP
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BOOTP opt_bootp.h
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BOOTP_COMPAT opt_bootp.h
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BOOTP_NFSROOT opt_bootp.h
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BOOTP_NFSV3 opt_bootp.h
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BOOTP_WIRED_TO opt_bootp.h
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BRIDGE opt_bdg.h
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ETHER_II opt_ef.h
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ETHER_8023 opt_ef.h
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ETHER_8022 opt_ef.h
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ETHER_SNAP opt_ef.h
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MROUTING opt_mrouting.h
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INET opt_inet.h
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INET6 opt_inet6.h
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IPSEC opt_ipsec.h
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IPSEC_ESP opt_ipsec.h
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IPSEC_DEBUG opt_ipsec.h
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IPDIVERT
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DUMMYNET opt_ipdn.h
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IPFILTER opt_ipfilter.h
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IPFILTER_LOG opt_ipfilter.h
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IPFILTER_DEFAULT_BLOCK opt_ipfilter.h
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PFIL_HOOKS opt_pfil_hooks.h
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IPFIREWALL opt_ipfw.h
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IPFIREWALL_VERBOSE opt_ipfw.h
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IPFIREWALL_VERBOSE_LIMIT opt_ipfw.h
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IPFIREWALL_DEFAULT_TO_ACCEPT opt_ipfw.h
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IPFIREWALL_FORWARD opt_ipfw.h
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IPV6FIREWALL opt_ip6fw.h
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IPV6FIREWALL_VERBOSE opt_ip6fw.h
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IPV6FIREWALL_VERBOSE_LIMIT opt_ip6fw.h
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IPV6FIREWALL_DEFAULT_TO_ACCEPT opt_ip6fw.h
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IPSTEALTH
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IPX opt_ipx.h
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IPXIP opt_ipx.h
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IPTUNNEL opt_ipx.h
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NCP opt_ncp.h
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NETATALK opt_atalk.h
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PPP_BSDCOMP opt_ppp.h
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PPP_DEFLATE opt_ppp.h
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PPP_FILTER opt_ppp.h
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SLIP_IFF_OPTS opt_slip.h
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TCP_COMPAT_42 opt_compat.h
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TCPDEBUG
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TCP_DROP_SYNFIN opt_tcp_input.h
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TCP_RESTRICT_RST opt_tcp_input.h
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XBONEHACK
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# Netgraph(4). Use option NETGRAPH to enable the base netgraph code.
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# Each netgraph node type can be either be compiled into the kernel
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# or loaded dynamically. To get the former, include the corresponding
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# option below. Each type has its own man page, e.g. ng_async(4).
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NETGRAPH
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NETGRAPH_ASYNC opt_netgraph.h
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NETGRAPH_BPF opt_netgraph.h
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NETGRAPH_BRIDGE opt_netgraph.h
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NETGRAPH_CISCO opt_netgraph.h
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NETGRAPH_ECHO opt_netgraph.h
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NETGRAPH_ETHER opt_netgraph.h
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NETGRAPH_FRAME_RELAY opt_netgraph.h
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NETGRAPH_HOLE opt_netgraph.h
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NETGRAPH_IFACE opt_netgraph.h
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NETGRAPH_KSOCKET opt_netgraph.h
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NETGRAPH_LMI opt_netgraph.h
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# MPPC compression requires proprietary files (not included)
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NETGRAPH_MPPC_COMPRESSION opt_netgraph.h
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NETGRAPH_MPPC_ENCRYPTION opt_netgraph.h
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NETGRAPH_PPP opt_netgraph.h
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NETGRAPH_PPPOE opt_netgraph.h
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NETGRAPH_PPTPGRE opt_netgraph.h
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NETGRAPH_RFC1490 opt_netgraph.h
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NETGRAPH_SOCKET opt_netgraph.h
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NETGRAPH_TEE opt_netgraph.h
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NETGRAPH_TTY opt_netgraph.h
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NETGRAPH_UI opt_netgraph.h
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NETGRAPH_VJC opt_netgraph.h
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# ATM (HARP version)
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ATM_CORE opt_atm.h
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ATM_IP opt_atm.h
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ATM_SIGPVC opt_atm.h
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ATM_SPANS opt_atm.h
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ATM_UNI opt_atm.h
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# XXX Conflict: # of devices vs network protocol (Native ATM).
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# This makes "atm.h" unusable.
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NATM opt_natm.h
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DPT_ALLOW_MEMIO opt_dpt.h # Allow PCI devices to use memory
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# mapped I/O
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# DPT driver debug flags
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DPT_MEASURE_PERFORMANCE opt_dpt.h
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DPT_HANDLE_TIMEOUTS opt_dpt.h
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DPT_TIMEOUT_FACTOR opt_dpt.h
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DPT_LOST_IRQ opt_dpt.h
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DPT_RESET_HBA opt_dpt.h
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# Adaptec ASR and DPT V/VI controller options
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ASR_MEASURE_PERFORMANCE opt_asr.h
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# Misc debug flags. Most of these should probably be replaced with
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# 'DEBUG', and then let people recompile just the interesting modules
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# with 'make CC="cc -DDEBUG"'.
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CLUSTERDEBUG opt_debug_cluster.h
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DEBUG_1284 opt_ppb_1284.h
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VP0_DEBUG opt_vpo.h
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LPT_DEBUG opt_lpt.h
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PLIP_DEBUG opt_plip.h
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LOCKF_DEBUG opt_debug_lockf.h
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LOUTB opt_debug_outb.h
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NPX_DEBUG opt_debug_npx.h
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NETATALKDEBUG opt_atalk.h
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SI_DEBUG opt_debug_si.h
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# Fb options
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FB_DEBUG opt_fb.h
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FB_INSTALL_CDEV opt_fb.h
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# ppbus related options
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PERIPH_1284 opt_ppb_1284.h
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DONTPROBE_1284 opt_ppb_1284.h
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# smbus related options
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ENABLE_ALART opt_intpm.h
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# These cause changes all over the kernel
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BLKDEV_IOSIZE opt_global.h
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DEBUG opt_global.h
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DEBUG_LOCKS opt_global.h
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DEBUG_VFS_LOCKS opt_global.h
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DIAGNOSTIC opt_global.h
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ENABLE_VFS_IOOPT opt_global.h
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INVARIANT_SUPPORT opt_global.h
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INVARIANTS opt_global.h
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SIMPLELOCK_DEBUG opt_global.h
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VFS_BIO_DEBUG opt_global.h
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# These are VM related options
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VM_KMEM_SIZE opt_vm.h
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VM_KMEM_SIZE_SCALE opt_vm.h
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VM_KMEM_SIZE_MAX opt_vm.h
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NO_SWAPPING opt_vm.h
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PQ_NOOPT opt_vmpage.h
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PQ_NORMALCACHE opt_vmpage.h
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PQ_MEDIUMCACHE opt_vmpage.h
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PQ_LARGECACHE opt_vmpage.h
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PQ_HUGECACHE opt_vmpage.h
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PQ_CACHESIZE opt_vmpage.h
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# Standard SMP options
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SMP opt_global.h
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# sys/netkey
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KEY
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# Size of the kernel message buffer
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MSGBUF_SIZE opt_msgbuf.h
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# PCI related options
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PCI_QUIET opt_pci.h
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COMPAT_OLDPCI
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# NFS options
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NFS_MINATTRTIMO opt_nfs.h
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NFS_MAXATTRTIMO opt_nfs.h
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NFS_MINDIRATTRTIMO opt_nfs.h
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NFS_MAXDIRATTRTIMO opt_nfs.h
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NFS_GATHERDELAY opt_nfs.h
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NFS_UIDHASHSIZ opt_nfs.h
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NFS_WDELAYHASHSIZ opt_nfs.h
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NFS_MUIDHASHSIZ opt_nfs.h
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NFS_NOSERVER opt_nfs.h
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NFS_DEBUG opt_nfs.h
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# For the Bt848/Bt848A/Bt849/Bt878/Bt879 driver
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OVERRIDE_CARD opt_bktr.h
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OVERRIDE_TUNER opt_bktr.h
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OVERRIDE_DBX opt_bktr.h
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OVERRIDE_MSP opt_bktr.h
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BROOKTREE_SYSTEM_DEFAULT opt_bktr.h
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BKTR_USE_PLL opt_bktr.h
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BKTR_GPIO_ACCESS opt_bktr.h
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BKTR_NO_MSP_RESET opt_bktr.h
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BKTR_430_FX_MODE opt_bktr.h
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BKTR_SIS_VIA_MODE opt_bktr.h
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# meteor opt_meteor.h
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METEOR_ALLOC_PAGES opt_meteor.h
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METEOR_TEST_VIDEO opt_meteor.h
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METEOR_SYSTEM_DEFAULT opt_meteor.h
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METEOR_DEALLOC_PAGES opt_meteor.h
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METEOR_DEALLOC_ABOVE opt_meteor.h
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# Various mi ISA bus flags
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COM_ESP opt_sio.h
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COM_MULTIPORT opt_sio.h
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BREAK_TO_DEBUGGER opt_comconsole.h
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ALT_BREAK_TO_DEBUGGER opt_comconsole.h
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# Include tweaks for running under the SimOS machine simulator.
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SIMOS opt_simos.h
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# options for bus/device framework
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BUS_DEBUG opt_bus.h
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DEVICE_SYSCTLS opt_bus.h
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# options for USB support
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UHCI_DEBUG opt_usb.h
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OHCI_DEBUG opt_usb.h
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USB_DEBUG opt_usb.h
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UGEN_DEBUG opt_usb.h
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UHID_DEBUG opt_usb.h
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UHUB_DEBUG opt_usb.h
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UKBD_DEBUG opt_usb.h
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ULPT_DEBUG opt_usb.h
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UMASS_DEBUG opt_usb.h
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UMS_DEBUG opt_usb.h
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URIO_DEBUG opt_usb.h
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UKBD_DFLT_KEYMAP opt_ukbd.h
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# Vinum options
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VINUMDEBUG opt_vinum.h
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# Embedded system options
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INIT_PATH opt_init_path.h
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ROOTDEVNAME opt_rootdevname.h
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FDC_DEBUG opt_fdc.h
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PCFCLOCK_VERBOSE opt_pcfclock.h
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PCFCLOCK_MAX_RETRIES opt_pcfclock.h
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TDFX_LINUX opt_tdfx.h
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KTR opt_global.h
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KTR_MASK opt_global.h
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KTR_CPUMASK opt_global.h
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KTR_COMPILE opt_global.h
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KTR_ENTRIES opt_global.h
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KTR_EXTEND opt_global.h
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SMP_DEBUG opt_global.h
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WITNESS opt_global.h
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# options for ACPI support
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ACPI_DEBUG opt_acpi.h
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AML_DEBUG opt_acpi.h
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ACPI_NO_ENABLE_ON_BOOT opt_acpi.h
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# options for DEVFS, see sys/fs/devfs/devfs.h
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NDEVFSINO opt_devfs.h
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NDEVFSOVERFLOW opt_devfs.h
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