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Linux/fs/erofs/Kconfig

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Diff markup

Differences between /fs/erofs/Kconfig (Version linux-6.12-rc7) and /fs/erofs/Kconfig (Version linux-6.7.12)


  1 # SPDX-License-Identifier: GPL-2.0-only             1 # SPDX-License-Identifier: GPL-2.0-only
  2                                                     2 
  3 config EROFS_FS                                     3 config EROFS_FS
  4         tristate "EROFS filesystem support"         4         tristate "EROFS filesystem support"
  5         depends on BLOCK                            5         depends on BLOCK
  6         select FS_IOMAP                             6         select FS_IOMAP
  7         select LIBCRC32C                            7         select LIBCRC32C
  8         help                                        8         help
  9           EROFS (Enhanced Read-Only File Syste      9           EROFS (Enhanced Read-Only File System) is a lightweight read-only
 10           file system with modern designs (e.g     10           file system with modern designs (e.g. no buffer heads, inline
 11           xattrs/data, chunk-based deduplicati     11           xattrs/data, chunk-based deduplication, multiple devices, etc.) for
 12           scenarios which need high-performanc     12           scenarios which need high-performance read-only solutions, e.g.
 13           smartphones with Android OS, LiveCDs     13           smartphones with Android OS, LiveCDs and high-density hosts with
 14           numerous containers;                     14           numerous containers;
 15                                                    15 
 16           It also provides fixed-sized output      16           It also provides fixed-sized output compression support in order to
 17           improve storage density as well as k     17           improve storage density as well as keep relatively higher compression
 18           ratios and implements in-place decom     18           ratios and implements in-place decompression to reuse the file page
 19           for compressed data temporarily with     19           for compressed data temporarily with proper strategies, which is
 20           quite useful to ensure guaranteed en     20           quite useful to ensure guaranteed end-to-end runtime decompression
 21           performance under extremely memory p     21           performance under extremely memory pressure without extra cost.
 22                                                    22 
 23           See the documentation at <file:Docum     23           See the documentation at <file:Documentation/filesystems/erofs.rst>
 24           and the web pages at <https://erofs.     24           and the web pages at <https://erofs.docs.kernel.org> for more details.
 25                                                    25 
 26           If unsure, say N.                        26           If unsure, say N.
 27                                                    27 
 28 config EROFS_FS_DEBUG                              28 config EROFS_FS_DEBUG
 29         bool "EROFS debugging feature"             29         bool "EROFS debugging feature"
 30         depends on EROFS_FS                        30         depends on EROFS_FS
 31         help                                       31         help
 32           Print debugging messages and enable      32           Print debugging messages and enable more BUG_ONs which check
 33           filesystem consistency and find pote     33           filesystem consistency and find potential issues aggressively,
 34           which can be used for Android eng bu     34           which can be used for Android eng build, for example.
 35                                                    35 
 36           For daily use, say N.                    36           For daily use, say N.
 37                                                    37 
 38 config EROFS_FS_XATTR                              38 config EROFS_FS_XATTR
 39         bool "EROFS extended attributes"           39         bool "EROFS extended attributes"
 40         depends on EROFS_FS                        40         depends on EROFS_FS
 41         select XXHASH                              41         select XXHASH
 42         default y                                  42         default y
 43         help                                       43         help
 44           Extended attributes are name:value p     44           Extended attributes are name:value pairs associated with inodes by
 45           the kernel or by users (see the attr     45           the kernel or by users (see the attr(5) manual page, or visit
 46           <http://acl.bestbits.at/> for detail     46           <http://acl.bestbits.at/> for details).
 47                                                    47 
 48           If unsure, say N.                        48           If unsure, say N.
 49                                                    49 
 50 config EROFS_FS_POSIX_ACL                          50 config EROFS_FS_POSIX_ACL
 51         bool "EROFS Access Control Lists"          51         bool "EROFS Access Control Lists"
 52         depends on EROFS_FS_XATTR                  52         depends on EROFS_FS_XATTR
 53         select FS_POSIX_ACL                        53         select FS_POSIX_ACL
 54         default y                                  54         default y
 55         help                                       55         help
 56           Posix Access Control Lists (ACLs) su     56           Posix Access Control Lists (ACLs) support permissions for users and
 57           groups beyond the owner/group/world      57           groups beyond the owner/group/world scheme.
 58                                                    58 
 59           To learn more about Access Control L     59           To learn more about Access Control Lists, visit the POSIX ACLs for
 60           Linux website <http://acl.bestbits.a     60           Linux website <http://acl.bestbits.at/>.
 61                                                    61 
 62           If you don't know what Access Contro     62           If you don't know what Access Control Lists are, say N.
 63                                                    63 
 64 config EROFS_FS_SECURITY                           64 config EROFS_FS_SECURITY
 65         bool "EROFS Security Labels"               65         bool "EROFS Security Labels"
 66         depends on EROFS_FS_XATTR                  66         depends on EROFS_FS_XATTR
 67         default y                                  67         default y
 68         help                                       68         help
 69           Security labels provide an access co     69           Security labels provide an access control facility to support Linux
 70           Security Models (LSMs) accepted by A     70           Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
 71           Linux. This option enables an extend     71           Linux. This option enables an extended attribute handler for file
 72           security labels in the erofs filesys     72           security labels in the erofs filesystem, so that it requires enabling
 73           the extended attribute support in ad     73           the extended attribute support in advance.
 74                                                    74 
 75           If you are not using a security modu     75           If you are not using a security module, say N.
 76                                                    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                                77 config EROFS_FS_ZIP
 95         bool "EROFS Data Compression Support"      78         bool "EROFS Data Compression Support"
 96         depends on EROFS_FS                        79         depends on EROFS_FS
 97         select LZ4_DECOMPRESS                      80         select LZ4_DECOMPRESS
 98         default y                                  81         default y
 99         help                                       82         help
100           Enable fixed-sized output compressio     83           Enable fixed-sized output compression for EROFS.
101                                                    84 
102           If you don't want to enable compress     85           If you don't want to enable compression feature, say N.
103                                                    86 
104 config EROFS_FS_ZIP_LZMA                           87 config EROFS_FS_ZIP_LZMA
105         bool "EROFS LZMA compressed data suppo     88         bool "EROFS LZMA compressed data support"
106         depends on EROFS_FS_ZIP                    89         depends on EROFS_FS_ZIP
107         select XZ_DEC                              90         select XZ_DEC
108         select XZ_DEC_MICROLZMA                    91         select XZ_DEC_MICROLZMA
109         help                                       92         help
110           Saying Y here includes support for r     93           Saying Y here includes support for reading EROFS file systems
111           containing LZMA compressed data, spe     94           containing LZMA compressed data, specifically called microLZMA. It
112           gives better compression ratios than     95           gives better compression ratios than the default LZ4 format, at the
113           expense of more CPU overhead.            96           expense of more CPU overhead.
114                                                    97 
115           If unsure, say N.                        98           If unsure, say N.
116                                                    99 
117 config EROFS_FS_ZIP_DEFLATE                       100 config EROFS_FS_ZIP_DEFLATE
118         bool "EROFS DEFLATE compressed data su    101         bool "EROFS DEFLATE compressed data support"
119         depends on EROFS_FS_ZIP                   102         depends on EROFS_FS_ZIP
120         select ZLIB_INFLATE                       103         select ZLIB_INFLATE
121         help                                      104         help
122           Saying Y here includes support for r    105           Saying Y here includes support for reading EROFS file systems
123           containing DEFLATE compressed data.     106           containing DEFLATE compressed data.  It gives better compression
124           ratios than the default LZ4 format,     107           ratios than the default LZ4 format, while it costs more CPU
125           overhead.                               108           overhead.
126                                                   109 
127           DEFLATE support is an experimental f    110           DEFLATE support is an experimental feature for now and so most
128           file systems will be readable withou    111           file systems will be readable without selecting this option.
129                                                   112 
130           If unsure, say N.                       113           If unsure, say N.
131                                                   114 
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                          115 config EROFS_FS_ONDEMAND
148         bool "EROFS fscache-based on-demand re !! 116         bool "EROFS fscache-based on-demand read support"
149         depends on EROFS_FS                    !! 117         depends on CACHEFILES_ONDEMAND && (EROFS_FS=m && FSCACHE || EROFS_FS=y && FSCACHE=y)
150         select NETFS_SUPPORT                   !! 118         default n
151         select FSCACHE                         << 
152         select CACHEFILES                      << 
153         select CACHEFILES_ONDEMAND             << 
154         help                                      119         help
155           This permits EROFS to use fscache-ba    120           This permits EROFS to use fscache-backed data blobs with on-demand
156           read support.                           121           read support.
157                                                << 
158           It is now deprecated and scheduled t << 
159           after fanotify pre-content hooks are << 
160                                                   122 
161           If unsure, say N.                       123           If unsure, say N.
162                                                   124 
163 config EROFS_FS_PCPU_KTHREAD                      125 config EROFS_FS_PCPU_KTHREAD
164         bool "EROFS per-cpu decompression kthr    126         bool "EROFS per-cpu decompression kthread workers"
165         depends on EROFS_FS_ZIP                   127         depends on EROFS_FS_ZIP
166         help                                      128         help
167           Saying Y here enables per-CPU kthrea    129           Saying Y here enables per-CPU kthread workers pool to carry out
168           async decompression for low latencie    130           async decompression for low latencies on some architectures.
169                                                   131 
170           If unsure, say N.                       132           If unsure, say N.
171                                                   133 
172 config EROFS_FS_PCPU_KTHREAD_HIPRI                134 config EROFS_FS_PCPU_KTHREAD_HIPRI
173         bool "EROFS high priority per-CPU kthr    135         bool "EROFS high priority per-CPU kthread workers"
174         depends on EROFS_FS_ZIP && EROFS_FS_PC    136         depends on EROFS_FS_ZIP && EROFS_FS_PCPU_KTHREAD
175         default y                                 137         default y
176         help                                      138         help
177           This permits EROFS to configure per-    139           This permits EROFS to configure per-CPU kthread workers to run
178           at higher priority.                     140           at higher priority.
179                                                   141 
180           If unsure, say N.                       142           If unsure, say N.
                                                      

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