1# SPDX-License-Identifier: GPL-2.0-only
  2config UBIFS_FS
  3	tristate "UBIFS file system support"
  4	select CRC16
  5	select CRC32
  6	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
  7	select CRYPTO if UBIFS_FS_LZO
  8	select CRYPTO if UBIFS_FS_ZLIB
  9	select CRYPTO if UBIFS_FS_ZSTD
 10	select CRYPTO_LZO if UBIFS_FS_LZO
 11	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
 12	select CRYPTO_ZSTD if UBIFS_FS_ZSTD
 13	select CRYPTO_HASH_INFO
 14	select UBIFS_FS_XATTR if FS_ENCRYPTION
 15	depends on MTD_UBI
 16	help
 17	  UBIFS is a file system for flash devices which works on top of UBI.
 18
 19if UBIFS_FS
 20
 21config UBIFS_FS_ADVANCED_COMPR
 22	bool "Advanced compression options"
 
 23	help
 24	  This option allows to explicitly choose which compressions, if any,
 25	  are enabled in UBIFS. Removing compressors means inability to read
 26	  existing file systems.
 27
 28	  If unsure, say 'N'.
 29
 30config UBIFS_FS_LZO
 31	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
 
 32	default y
 33	help
 34	   LZO compressor is generally faster than zlib but compresses worse.
 35	   Say 'Y' if unsure.
 36
 37config UBIFS_FS_ZLIB
 38	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
 39	default y
 40	help
 41	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
 42
 43config UBIFS_FS_ZSTD
 44	bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
 45	depends on UBIFS_FS
 46	default y
 47	help
 48	  ZSTD compresses is a big win in speed over Zlib and
 49	  in compression ratio over LZO. Say 'Y' if unsure.
 50
 51config UBIFS_ATIME_SUPPORT
 52	bool "Access time support"
 
 53	default n
 54	help
 55	  Originally UBIFS did not support atime, because it looked like a bad idea due
 56	  increased flash wear. This option adds atime support and it is disabled by default
 57	  to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
 58	  which means that file-system read operations will cause writes (inode atime
 59	  updates). This may affect file-system performance and increase flash device wear,
 60	  so be careful. How often atime is updated depends on the selected strategy:
 61	  strictatime is the "heavy", relatime is "lighter", etc.
 62
 63	  If unsure, say 'N'
 64
 65config UBIFS_FS_XATTR
 66	bool "UBIFS XATTR support"
 67	default y
 68	help
 69	  Saying Y here includes support for extended attributes (xattrs).
 70	  Xattrs are name:value pairs associated with inodes by
 71	  the kernel or by users (see the attr(5) manual page).
 72
 73	  If unsure, say Y.
 74
 75config UBIFS_FS_SECURITY
 76	bool "UBIFS Security Labels"
 77	depends on UBIFS_FS_XATTR
 78	default y
 79	help
 80	  Security labels provide an access control facility to support Linux
 81	  Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
 82	  Linux. This option enables an extended attribute handler for file
 83	  security labels in the ubifs filesystem, so that it requires enabling
 84	  the extended attribute support in advance.
 85
 86	  If you are not using a security module, say N.
 87
 88config UBIFS_FS_AUTHENTICATION
 89	bool "UBIFS authentication support"
 90	select KEYS
 91	select CRYPTO_HMAC
 92	select SYSTEM_DATA_VERIFICATION
 93	help
 94	  Enable authentication support for UBIFS. This feature offers protection
 95	  against offline changes for both data and metadata of the filesystem.
 96	  If you say yes here you should also select a hashing algorithm such as
 97	  sha256, these are not selected automatically since there are many
 98	  different options.
 99
100endif # UBIFS_FS

 
 1config UBIFS_FS
 2	tristate "UBIFS file system support"
 3	select CRC16
 4	select CRC32
 5	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
 6	select CRYPTO if UBIFS_FS_LZO
 7	select CRYPTO if UBIFS_FS_ZLIB
 
 8	select CRYPTO_LZO if UBIFS_FS_LZO
 9	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
 
 
 
10	depends on MTD_UBI
11	help
12	  UBIFS is a file system for flash devices which works on top of UBI.
13
 
 
14config UBIFS_FS_ADVANCED_COMPR
15	bool "Advanced compression options"
16	depends on UBIFS_FS
17	help
18	  This option allows to explicitly choose which compressions, if any,
19	  are enabled in UBIFS. Removing compressors means inability to read
20	  existing file systems.
21
22	  If unsure, say 'N'.
23
24config UBIFS_FS_LZO
25	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
26	depends on UBIFS_FS
27	default y
28	help
29	   LZO compressor is generally faster than zlib but compresses worse.
30	   Say 'Y' if unsure.
31
32config UBIFS_FS_ZLIB
33	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
 
 
 
 
 
 
34	depends on UBIFS_FS
35	default y
36	help
37	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
 
38
39config UBIFS_ATIME_SUPPORT
40	bool "Access time support" if UBIFS_FS
41	depends on UBIFS_FS
42	default n
43	help
44	  Originally UBIFS did not support atime, because it looked like a bad idea due
45	  increased flash wear. This option adds atime support and it is disabled by default
46	  to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
47	  which means that file-system read operations will cause writes (inode atime
48	  updates). This may affect file-system performance and increase flash device wear,
49	  so be careful. How often atime is updated depends on the selected strategy:
50	  strictatime is the "heavy", relatime is "lighter", etc.
51
52	  If unsure, say 'N'
53
54config UBIFS_FS_ENCRYPTION
55	bool "UBIFS Encryption"
56	depends on UBIFS_FS && BLOCK
57	select FS_ENCRYPTION
58	default n
 
 
 
 
 
 
 
 
 
59	help
60	  Enable encryption of UBIFS files and directories. This
61	  feature is similar to ecryptfs, but it is more memory
62	  efficient since it avoids caching the encrypted and
63	  decrypted pages in the page cache.