1 # SPDX-License-Identifier: GPL-2.0-only
2
3 config EROFS_FS
4 tristate "EROFS filesystem support"
5 depends on BLOCK
6 select FS_IOMAP
7 select LIBCRC32C
8 help
9 EROFS (Enhanced Read-Only File Syste
10 file system with modern designs (e.g
11 xattrs/data, chunk-based deduplicati
12 scenarios which need high-performanc
13 smartphones with Android OS, LiveCDs
14 numerous containers;
15
16 It also provides fixed-sized output
17 improve storage density as well as k
18 ratios and implements in-place decom
19 for compressed data temporarily with
20 quite useful to ensure guaranteed en
21 performance under extremely memory p
22
23 See the documentation at <file:Docum
24 and the web pages at <https://erofs.
25
26 If unsure, say N.
27
28 config EROFS_FS_DEBUG
29 bool "EROFS debugging feature"
30 depends on EROFS_FS
31 help
32 Print debugging messages and enable
33 filesystem consistency and find pote
34 which can be used for Android eng bu
35
36 For daily use, say N.
37
38 config EROFS_FS_XATTR
39 bool "EROFS extended attributes"
40 depends on EROFS_FS
41 select XXHASH
42 default y
43 help
44 Extended attributes are name:value p
45 the kernel or by users (see the attr
46 <http://acl.bestbits.at/> for detail
47
48 If unsure, say N.
49
50 config EROFS_FS_POSIX_ACL
51 bool "EROFS Access Control Lists"
52 depends on EROFS_FS_XATTR
53 select FS_POSIX_ACL
54 default y
55 help
56 Posix Access Control Lists (ACLs) su
57 groups beyond the owner/group/world
58
59 To learn more about Access Control L
60 Linux website <http://acl.bestbits.a
61
62 If you don't know what Access Contro
63
64 config EROFS_FS_SECURITY
65 bool "EROFS Security Labels"
66 depends on EROFS_FS_XATTR
67 default y
68 help
69 Security labels provide an access co
70 Security Models (LSMs) accepted by A
71 Linux. This option enables an extend
72 security labels in the erofs filesys
73 the extended attribute support in ad
74
75 If you are not using a security modu
76
77 config EROFS_FS_BACKED_BY_FILE
78 bool "File-backed EROFS filesystem sup
79 depends on EROFS_FS
80 default y
81 help
82 This allows EROFS to use filesystem
83 the intercession of loopback block d
84 particularly useful for container im
85 other sandboxes, where loop devices
86 be used to simplify error-prone life
87 virtual block devices.
88
89 Note that this feature, along with o
90 hooks, will eventually replace "EROF
91
92 If you don't want to enable this fea
93
94 config EROFS_FS_ZIP
95 bool "EROFS Data Compression Support"
96 depends on EROFS_FS
97 select LZ4_DECOMPRESS
98 default y
99 help
100 Enable fixed-sized output compressio
101
102 If you don't want to enable compress
103
104 config EROFS_FS_ZIP_LZMA
105 bool "EROFS LZMA compressed data suppo
106 depends on EROFS_FS_ZIP
107 select XZ_DEC
108 select XZ_DEC_MICROLZMA
109 help
110 Saying Y here includes support for r
111 containing LZMA compressed data, spe
112 gives better compression ratios than
113 expense of more CPU overhead.
114
115 If unsure, say N.
116
117 config EROFS_FS_ZIP_DEFLATE
118 bool "EROFS DEFLATE compressed data su
119 depends on EROFS_FS_ZIP
120 select ZLIB_INFLATE
121 help
122 Saying Y here includes support for r
123 containing DEFLATE compressed data.
124 ratios than the default LZ4 format,
125 overhead.
126
127 DEFLATE support is an experimental f
128 file systems will be readable withou
129
130 If unsure, say N.
131
132 config EROFS_FS_ZIP_ZSTD
133 bool "EROFS Zstandard compressed data
134 depends on EROFS_FS_ZIP
135 select ZSTD_DECOMPRESS
136 help
137 Saying Y here includes support for r
138 containing Zstandard compressed data
139 ratios than the default LZ4 format,
140 overhead.
141
142 Zstandard support is an experimental
143 file systems will be readable withou
144
145 If unsure, say N.
146
147 config EROFS_FS_ONDEMAND
148 bool "EROFS fscache-based on-demand re
149 depends on EROFS_FS
150 select NETFS_SUPPORT
151 select FSCACHE
152 select CACHEFILES
153 select CACHEFILES_ONDEMAND
154 help
155 This permits EROFS to use fscache-ba
156 read support.
157
158 It is now deprecated and scheduled t
159 after fanotify pre-content hooks are
160
161 If unsure, say N.
162
163 config EROFS_FS_PCPU_KTHREAD
164 bool "EROFS per-cpu decompression kthr
165 depends on EROFS_FS_ZIP
166 help
167 Saying Y here enables per-CPU kthrea
168 async decompression for low latencie
169
170 If unsure, say N.
171
172 config EROFS_FS_PCPU_KTHREAD_HIPRI
173 bool "EROFS high priority per-CPU kthr
174 depends on EROFS_FS_ZIP && EROFS_FS_PC
175 default y
176 help
177 This permits EROFS to configure per-
178 at higher priority.
179
180 If unsure, say N.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.