~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/erofs/Kconfig

Version: ~ [ linux-6.12-rc7 ] ~ [ linux-6.11.7 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.60 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.116 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.171 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.229 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.285 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.323 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.12 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 System) is a lightweight read-only
 10           file system with modern designs (e.g. no buffer heads, inline
 11           xattrs/data, chunk-based deduplication, multiple devices, etc.) for
 12           scenarios which need high-performance read-only solutions, e.g.
 13           smartphones with Android OS, LiveCDs and high-density hosts with
 14           numerous containers;
 15 
 16           It also provides fixed-sized output compression support in order to
 17           improve storage density as well as keep relatively higher compression
 18           ratios and implements in-place decompression to reuse the file page
 19           for compressed data temporarily with proper strategies, which is
 20           quite useful to ensure guaranteed end-to-end runtime decompression
 21           performance under extremely memory pressure without extra cost.
 22 
 23           See the documentation at <file:Documentation/filesystems/erofs.rst>
 24           and the web pages at <https://erofs.docs.kernel.org> for more details.
 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 more BUG_ONs which check
 33           filesystem consistency and find potential issues aggressively,
 34           which can be used for Android eng build, for example.
 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 pairs associated with inodes by
 45           the kernel or by users (see the attr(5) manual page, or visit
 46           <http://acl.bestbits.at/> for details).
 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) support permissions for users and
 57           groups beyond the owner/group/world scheme.
 58 
 59           To learn more about Access Control Lists, visit the POSIX ACLs for
 60           Linux website <http://acl.bestbits.at/>.
 61 
 62           If you don't know what Access Control Lists are, say N.
 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 control facility to support Linux
 70           Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
 71           Linux. This option enables an extended attribute handler for file
 72           security labels in the erofs filesystem, so that it requires enabling
 73           the extended attribute support in advance.
 74 
 75           If you are not using a security module, say N.
 76 
 77 config EROFS_FS_BACKED_BY_FILE
 78         bool "File-backed EROFS filesystem support"
 79         depends on EROFS_FS
 80         default y
 81         help
 82           This allows EROFS to use filesystem image files directly, without
 83           the intercession of loopback block devices or likewise. It is
 84           particularly useful for container images with numerous blobs and
 85           other sandboxes, where loop devices behave intricately.  It can also
 86           be used to simplify error-prone lifetime management of unnecessary
 87           virtual block devices.
 88 
 89           Note that this feature, along with ongoing fanotify pre-content
 90           hooks, will eventually replace "EROFS over fscache."
 91 
 92           If you don't want to enable this feature, say N.
 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 compression for EROFS.
101 
102           If you don't want to enable compression feature, say N.
103 
104 config EROFS_FS_ZIP_LZMA
105         bool "EROFS LZMA compressed data support"
106         depends on EROFS_FS_ZIP
107         select XZ_DEC
108         select XZ_DEC_MICROLZMA
109         help
110           Saying Y here includes support for reading EROFS file systems
111           containing LZMA compressed data, specifically called microLZMA. It
112           gives better compression ratios than the default LZ4 format, at the
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 support"
119         depends on EROFS_FS_ZIP
120         select ZLIB_INFLATE
121         help
122           Saying Y here includes support for reading EROFS file systems
123           containing DEFLATE compressed data.  It gives better compression
124           ratios than the default LZ4 format, while it costs more CPU
125           overhead.
126 
127           DEFLATE support is an experimental feature for now and so most
128           file systems will be readable without selecting this option.
129 
130           If unsure, say N.
131 
132 config EROFS_FS_ZIP_ZSTD
133         bool "EROFS Zstandard compressed data support"
134         depends on EROFS_FS_ZIP
135         select ZSTD_DECOMPRESS
136         help
137           Saying Y here includes support for reading EROFS file systems
138           containing Zstandard compressed data.  It gives better compression
139           ratios than the default LZ4 format, while it costs more CPU
140           overhead.
141 
142           Zstandard support is an experimental feature for now and so most
143           file systems will be readable without selecting this option.
144 
145           If unsure, say N.
146 
147 config EROFS_FS_ONDEMAND
148         bool "EROFS fscache-based on-demand read support (deprecated)"
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-backed data blobs with on-demand
156           read support.
157 
158           It is now deprecated and scheduled to be removed from the kernel
159           after fanotify pre-content hooks are landed.
160 
161           If unsure, say N.
162 
163 config EROFS_FS_PCPU_KTHREAD
164         bool "EROFS per-cpu decompression kthread workers"
165         depends on EROFS_FS_ZIP
166         help
167           Saying Y here enables per-CPU kthread workers pool to carry out
168           async decompression for low latencies on some architectures.
169 
170           If unsure, say N.
171 
172 config EROFS_FS_PCPU_KTHREAD_HIPRI
173         bool "EROFS high priority per-CPU kthread workers"
174         depends on EROFS_FS_ZIP && EROFS_FS_PCPU_KTHREAD
175         default y
176         help
177           This permits EROFS to configure per-CPU kthread workers to run
178           at higher priority.
179 
180           If unsure, say N.

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

sflogo.php