erofs-utils: man: mkfs.erofs: wording/formatting touchups

Some things that gave me pause or were weirdly formatted.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/8490d5f3cbfdd11ee2690b3e642f7cd70ac9f582.1681041325.git.nabijaczleweli@nabijaczleweli.xyz
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

1 files changed, 57 insertions, 43 deletions

diff --git a/man/mkfs.erofs.1 b/man/mkfs.erofs.1
index 82ef138..1cfde28 100644
--- a/man/mkfs.erofs.1
+++ b/man/mkfs.erofs.1
@@ -20,25 +20,25 @@ mkfs.erofs is used to create such EROFS filesystem \fIDESTINATION\fR image file
 from \fISOURCE\fR directory.
 .SH OPTIONS
 .TP
-.BI "\-z " compression-algorithm " [" ",#" "]" " [:" " ... " "]"
+.BI "\-z " compression-algorithm \fR[\fP, # \fR][\fP: ... \fR]\fP
 Set a primary algorithm for data compression, which can be set with an optional
 compression level (1 to 12 for LZ4HC, 0 to 9 for LZMA and 100 to 109 for LZMA
 extreme compression) separated by a comma.  Alternative algorithms could be
 specified and separated by colons.
 .TP
 .BI "\-C " max-pcluster-size
-Specify the maximum size of compress physical cluster in bytes. It may enable
-big pcluster feature if needed (Linux v5.13+).
+Specify the maximum size of compress physical cluster in bytes.
+This may cause the big pcluster feature to be enabled (Linux v5.13+).
 .TP
 .BI "\-d " #
 Specify the level of debugging messages. The default is 2, which shows basic
 warning messages.
 .TP
 .BI "\-x " #
-Specify the upper limit of an xattr which is still inlined. The default is 2.
-Disable storing xattrs if < 0.
+Limit how many xattrs will be inlined. The default is 2.
+Disables storing xattrs if < 0.
 .TP
-.BI "\-E " extended-option " [,...]"
+.BI "\-E " extended-option \fR[\fP, ... \fR]\fP
 Set extended options for the filesystem. Extended options are comma separated,
 and may take an extra argument using the equals ('=') sign.
 The following extended options are supported:
@@ -51,29 +51,30 @@ it may take an argument as the pcluster size of the packed inode in bytes.
 .TP
 .BI dedupe
 Enable global compressed data deduplication to minimize duplicated data in
-the filesystem. It may be used with \fI-Efragments\fR option together to
-further reduce image sizes. (Linux v6.1+)
+the filesystem. May further reduce image size when used with
+.BR -E\ fragments .
+(Linux v6.1+)
 .TP
 .BI force-inode-compact
-Forcely generate compact inodes (32-byte inodes) to output.
+Force generation of compact (32-byte) inodes.
 .TP
 .BI force-inode-extended
-Forcely generate extended inodes (64-byte inodes) to output.
+Force generation of extended (64-byte) inodes.
 .TP
 .BI force-inode-blockmap
-Forcely generate inode chunk format in 4-byte block address array.
+Force generation of inode chunk format as a 4-byte block address array.
 .TP
 .BI force-chunk-indexes
-Forcely generate inode chunk format in 8-byte chunk indexes (with device id).
+Forcely generate inode chunk format as an 8-byte chunk index (with device ID).
 .TP
-.BI fragments
-Pack the tail part (pcluster) of compressed files or the whole files into a
+.BI fragments\fR[\fP= size \fR]\fP
+Pack the tail part (pcluster) of compressed files, or entire files, into a
 special inode for smaller image sizes, and it may take an argument as the
 pcluster size of the packed inode in bytes. (Linux v6.1+)
 .TP
 .BI legacy-compress
-Drop "inplace decompression" and "compacted indexes" support, which is used
-to generate compatible EROFS images for Linux v4.19 - 5.3.
+Disable "inplace decompression" and "compacted indexes",
+for compatibility with Linux pre-v5.4.
 .TP
 .BI noinline_data
 Don't inline regular files to enable FSDAX for these files (Linux v5.15+).
@@ -89,8 +90,8 @@ Set the volume label for the filesystem to
 The maximum length of the volume label is 16 bytes.
 .TP
 .BI "\-T " #
-Set all files to the given UNIX timestamp. Reproducible builds requires setting
-all to a specific one.
+Set all files to the given UNIX timestamp. Reproducible builds require setting
+all to a specific one. By default, the source file's modification time is used.
 .TP
 .BI "\-U " UUID
 Set the universally unique identifier (UUID) of the filesystem to
@@ -102,64 +103,77 @@ like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16".
 Make all files owned by root.
 .TP
 .BI "\-\-blobdev " file
-Specify another extra blob device to store chunk-based data.
+Specify an extra blob device to store chunk-based data.
 .TP
 .BI "\-\-chunksize " #
 Generate chunk-based files with #-byte chunks.
 .TP
 .BI "\-\-compress-hints " file
-If the optional
-.BI "\-\-compress-hints " file
-argument is given,
-.B mkfs.erofs
-uses it to apply the per-file compression strategy. Each line is defined by
+Apply a per-file compression strategy. Each line in
+.I file
+is defined by
 tokens separated by spaces in the following form.  Optionally, instead of
-the given primary algorithm, alternative algorithms could be specified with
-\fIalgorithm-index\fR by hand:
+the given primary algorithm, alternative algorithms can be specified with
+\fIalgorithm-index\fR explicitly:
 .RS 1.2i
-<pcluster-in-bytes> [algorithm-index] <match-pattern>
+<pcluster-size-in-bytes> [algorithm-index] <match-pattern>
 .RE
+.IR match-pattern s
+are extended regular expressions, matched against absolute paths within
+the output filesystem, with no leading /.
 .TP
 .BI "\-\-exclude-path=" path
 Ignore file that matches the exact literal path.
-You may give multiple `--exclude-path' options.
+You may give multiple
+.B --exclude-path
+options.
 .TP
 .BI "\-\-exclude-regex=" regex
-Ignore files that match the given regular expression.
-You may give multiple `--exclude-regex` options.
+Ignore files that match the given extended regular expression.
+You may give multiple
+.B --exclude-regex
+options.
 .TP
 .BI "\-\-file-contexts=" file
-Specify a \fIfile_contexts\fR file to setup / override selinux labels.
+Read SELinux label configuration/overrides from \fIfile\fR in the
+.BR selinux_file (5)
+format.
 .TP
 .BI "\-\-force-uid=" UID
-Set all file uids to \fIUID\fR.
+Set all file UIDs to \fIUID\fR.
 .TP
 .BI "\-\-force-gid=" GID
-Set all file gids to \fIGID\fR.
+Set all file GIDs to \fIGID\fR.
 .TP
 .BI "\-\-gid-offset=" GIDOFFSET
-Add \fIGIDOFFSET\fR to all file gids.
-When this option is used together with --force-gid, the final file gids are
+Add \fIGIDOFFSET\fR to all file GIDs.
+When this option is used together with
+.BR --force-gid ,
+the final file gids are
 set to \fIGID\fR + \fIGID-OFFSET\fR.
 .TP
 .B \-\-help
-Display this help and exit.
+Display help string and exit.
 .TP
 .B "\-\-ignore-mtime"
-File modification time is ignored whenever it would cause \fBmkfs.erofs\fR to
+Ignore the file modification time whenever it would cause \fBmkfs.erofs\fR to
 use extended inodes over compact inodes. When not using a fixed timestamp, this
-can reduce total metadata size.
+can reduce total metadata size. Implied by
+.BR "-E force-inode-compact" .
 .TP
 .BI "\-\-max-extent-bytes " #
-Specify maximum decompressed extent size # in bytes.
+Specify maximum decompressed extent size in bytes.
 .TP
 .B "\-\-preserve-mtime"
-File modification time is preserved whenever \fBmkfs.erofs\fR decides to use
-extended inodes over compact inodes.
+Use extended inodes instead of compact inodes if the file modification time
+would overflow compact inodes. This is the default. Overrides
+.BR --ignore-mtime .
 .TP
 .BI "\-\-uid-offset=" UIDOFFSET
-Add \fIUIDOFFSET\fR to all file uids.
-When this option is used together with --force-uid, the final file uids are
+Add \fIUIDOFFSET\fR to all file UIDs.
+When this option is used together with
+.BR --force-uid ,
+the final file uids are
 set to \fIUID\fR + \fIUIDOFFSET\fR.
 .SH AUTHOR
 This version of \fBmkfs.erofs\fR is written by Li Guifu <blucerlee@gmail.com>,