ref: e1cd22504e26d0a732a4219d38d6e5fe3e03aa21
dir: /sys/man/4/ext4srv/
.TH EXT4SRV 4 .SH NAME ext4srv \- ext4 file system .SH SYNOPSIS .B ext4srv [ .B -Crs ] [ .B -g .I groupfile ] [ .B -R .I uid ] [ .I service ] .PP .B ext4srv .B -M .I (2|3|4) [ .B -L .I label ] [ .B -b .I blksize ] [ .B -N .I numinodes ] [ .B -I .I inodesize ] .I device .SH DESCRIPTION .I Ext4srv is a file server that interprets the Linux Second, Third and Fourth Extended File Systems. A single instance of .I ext4srv can provide access to multiple ext2, ext3 and ext4 partitions simultaneously. .PP .I Ext4srv posts a file descriptor named .I service (default .BR ext4 ) in the .B /srv directory. To access an ext4 file system on a device, use .B mount with the .I spec argument (see .IR bind (1)) the name of the file holding the raw ext4 file system, typically the disk or partition. If .I spec is undefined in the .BR mount , .I ext4srv will use .I file as the default name for the device holding the file system. .PP Normally .I ext4srv creates a pipe to act as the communications channel between itself and its clients. The .B -s flag instructs .I ext4srv to use its standard input and output instead. This flag also prevents the creation of an explicit service file in .BR /srv . .PP The .B -r flag (recommended) makes the file system read-only. The optional .B -g flags specify Unix-format group file that give the mapping between the numeric user- and group-ID numbers in the ext4 file system and the strings reported by Plan 9 status inquiries. .PP With .B -R option the filesystem can be mounted in "root" mode, allowing full access regardless of permissions. The usual .I uid in this case is .IR 0 . .PP Some file system state is cached in memory, and may be flushed only when the file system is unmounted if .B -C flag is used, which enabled write-back cache. Therefore if .I ext4srv is stopped or the machine is rebooted while an ext4 file system is still mounted, the superblock on the device will have been marked `not valid' (unless the .B -r flag was used). .SH MKFS A different mode of .I ext4srv is enabled with .B -M option that accepts the file system version .RI ( 2 for .I ext2 and so on). In this mode filesystem is initialized on the specified .I device and all existing data on it is destroyed. .PP Additional options may be specified, for example .B -L may be used to set the filesystem label. .SH BUGS Yes. .PP Permission checking is very basic and may not be complete. Symlinks are not resolved. There may be many bugs. It is advisable to use .I ext4srv in read-only mode whenever possible. .SH HISTORY .I Ext4srv first appeared in 9front (February, 2024).