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diff --git a/e2fsck/e2fsck.conf.5.in b/e2fsck/e2fsck.conf.5.in new file mode 100644 index 0000000..e82610d --- /dev/null +++ b/e2fsck/e2fsck.conf.5.in @@ -0,0 +1,501 @@ +.\" -*- nroff -*- +.\" Copyright 2006 by Theodore Ts'o. All Rights Reserved. +.\" This file may be copied under the terms of the GNU Public License. +.\" +.TH e2fsck.conf 5 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@" +.SH NAME +e2fsck.conf \- Configuration file for e2fsck +.SH DESCRIPTION +.I e2fsck.conf +is the configuration file for +.BR e2fsck (8). +It controls the default behavior of +.BR e2fsck (8) +while it is checking ext2, ext3, or ext4 file systems. +.PP +The +.I e2fsck.conf +file uses an INI-style format. Stanzas, or top-level sections, are +delimited by square braces: [ ]. Within each section, each line +defines a relation, which assigns tags to values, or to a subsection, +which contains further relations or subsections. +.\" Tags can be assigned multiple values +An example of the INI-style format used by this configuration file +follows below: +.P + [section1] +.br + tag1 = value_a +.br + tag1 = value_b +.br + tag2 = value_c +.P + [section 2] +.br + tag3 = { +.br + subtag1 = subtag_value_a +.br + subtag1 = subtag_value_b +.br + subtag2 = subtag_value_c +.br + } +.br + tag1 = value_d +.br + tag2 = value_e +.br + } +.P +Comments are delimited by a semicolon (';') or a hash ('#') character +at the beginning of the comment, and are terminated by the end of +line character. +.P +Tags and values must be quoted using double quotes if they contain +spaces. Within a quoted string, the standard backslash interpretations +apply: "\en" (for the newline character), +"\et" (for the tab character), "\eb" (for the backspace character), +and "\e\e" (for the backslash character). +.P +The following stanzas are used in the +.I e2fsck.conf +file. They will be described in more detail in future sections of this +document. +.TP +.I [options] +This stanza contains general configuration parameters for +.BR e2fsck 's +behavior. +.TP +.I [defaults] +Contains relations which define the default parameters used by +.BR e2fsck (8). +In general, these defaults may be overridden by command-line options +provided by the user. +.TP +.I [problems] +This stanza allows the administrator to reconfigure how e2fsck handles +various file system inconsistencies. +@TDB_MAN_COMMENT@.TP +@TDB_MAN_COMMENT@.I [scratch_files] +@TDB_MAN_COMMENT@This stanza controls when e2fsck will attempt to use +@TDB_MAN_COMMENT@scratch files to reduce the need for memory. +.SH THE [options] STANZA +The following relations are defined in the +.I [options] +stanza. +.TP +.I allow_cancellation +If this relation is set to a boolean value of true, then if the user +interrupts e2fsck using ^C, and the file system is not explicitly flagged +as containing errors, e2fsck will exit with an exit status of 0 instead +of 32. This setting defaults to false. +.TP +.I accept_time_fudge +Unfortunately, due to Windows' unfortunate design decision +to configure the hardware clock to tick localtime, instead +of the more proper and less error-prone UTC time, many +users end up in the situation where the system clock is +incorrectly set at the time when e2fsck is run. +.IP +Historically this was usually due to some distributions +having buggy init scripts and/or installers that didn't +correctly detect this case and take appropriate +countermeasures. Unfortunately, this is occasionally +true even today, usually due to a +buggy or misconfigured virtualization manager or the +installer not having access to a network time server +during the installation process. So by default, we allow +the superblock times to be fudged by up to 24 hours. +This can be disabled by setting +.I accept_time_fudge +to the +boolean value of false. This setting defaults to true. +.TP +.I broken_system_clock +The +.BR e2fsck (8) +program has some heuristics that assume that the system clock is +correct. In addition, many system programs make similar assumptions. +For example, the UUID library depends on time not going backwards in +order for it to be able to make its guarantees about issuing universally +unique ID's. Systems with broken system clocks, are well, broken. +However, broken system clocks, particularly in embedded systems, do +exist. E2fsck will attempt to use heuristics to determine if the time +can not be trusted; and to skip time-based checks if this is true. If +this boolean is set to true, then e2fsck will always assume that the +system clock can not be trusted. +.TP +.I buggy_init_scripts +This boolean relation is an alias for +.I accept_time_fudge +for backwards compatibility; it used to +be that the behavior defined by +.I accept_time_fudge +above defaulted to false, and +.I buggy_init_scripts +would enable superblock time field to be wrong by up to 24 hours. When +we changed the default, we also renamed this boolean relation to +.IR accept_time_fudge. +.TP +.I clear_test_fs_flag +This boolean relation controls whether or not +.BR e2fsck (8) +will offer to clear +the test_fs flag if the ext4 file system is available on the system. It +defaults to true. +.TP +.I defer_check_on_battery +This boolean relation controls whether or not the interval between +file system checks (either based on time or number of mounts) should +be doubled if the system is running on battery. This setting defaults to +true. +.TP +.I indexed_dir_slack_percentage +When +.BR e2fsck (8) +repacks a indexed directory, reserve the specified percentage of +empty space in each leaf nodes so that a few new entries can +be added to the directory without splitting leaf nodes, so that +the average fill ratio of directories can be maintained at a +higher, more efficient level. This relation defaults to 20 +percent. +.TP +.I inode_count_fullmap +If this boolean relation is true, trade off using memory for speed when +checking a file system with a large number of hard-linked files. The +amount of memory required is proportional to the number of inodes in the +file system. For large file systems, this can be gigabytes of memory. +(For example a 40TB file system with 2.8 billion inodes will consume an +additional 5.7 GB memory if this optimization is enabled.) This setting +defaults to false. +.TP +.I log_dir +If the +.I log_filename +or +.I problem_log_filename +relations contains a relative pathname, then the log file will be placed +in the directory named by the +.I log_dir +relation. +.TP +.I log_dir_fallback +This relation contains an alternate directory that will be used if the +directory specified by +.I log_dir +is not available or is not writable. +.TP +.I log_dir_wait +If this boolean relation is true, them if the directories specified by +.I log_dir +or +.I log_dir_fallback +are not available or are not yet writable, e2fsck will save the output +in a memory buffer, and a child process will periodically test to see if +the log directory has become available after the boot sequence has +mounted the requested file system for reading/writing. This implements the +functionality provided by +.BR logsave (8) +for e2fsck log files. +.TP +.I log_filename +This relation specifies the file name where a copy of e2fsck's output +will be written. If certain problem reports are suppressed using the +.I max_count_problems +relation, (or on a per-problem basis using the +.I max_count +relation), the full set of problem reports will be written to the log +file. The filename may contain various percent-expressions (%D, %T, %N, +etc.) which will be expanded so that the file name for the log file can +include things like date, time, device name, and other run-time +parameters. See the +.B LOGGING +section for more details. +.TP +.I max_count_problems +This relation specifies the maximum number of problem reports of a +particular type will be printed to stdout before further problem reports +of that type are squelched. This can be useful if the console is slow +(i.e., connected to a serial port) and so a large amount of output could +end up delaying the boot process for a long time (potentially hours). +.TP +.I no_optimize_extents +If this boolean relation is true, do not offer to optimize the extent +tree by reducing the tree's width or depth. This setting defaults to false. +.TP +.I problem_log_filename +This relation specifies the file name where a log of problem codes +found by e2fsck be written. The filename may contain various +percent-expressions (%D, %T, %N, +etc.) which will be expanded so that the file name for the log file can +include things like date, time, device name, and other run-time +parameters. See the +.B LOGGING +section for more details. +.TP +.I readahead_mem_pct +Use this percentage of memory to try to read in metadata blocks ahead of the +main e2fsck thread. This should reduce run times, depending on the speed of +the underlying storage and the amount of free memory. There is no default, but +see +.B readahead_kb +for more details. +.TP +.I readahead_kb +Use this amount of memory to read in metadata blocks ahead of the main checking +thread. Setting this value to zero disables readahead entirely. By default, +this is set the size of two block groups' inode tables (typically 4MiB on a +regular ext4 file system); if this amount is more than 1/50th of total physical +memory, readahead is disabled. +.TP +.I report_features +If this boolean relation is true, e2fsck will print the file system +features as part of its verbose reporting (i.e., if the +.B -v +option is specified) +.TP +.I report_time +If this boolean relation is true, e2fsck will run as if the options +.B -tt +are always specified. This will cause e2fsck to print timing statistics +on a pass by pass basis for full file system checks. +.TP +.I report_verbose +If this boolean relation is true, e2fsck will run as if the option +.B -v +is always specified. This will cause e2fsck to print some additional +information at the end of each full file system check. +.SH THE [defaults] STANZA +The following relations are defined in the +.I [defaults] +stanza. +.TP +.I undo_dir +This relation specifies the directory where the undo file should be +stored. It can be overridden via the +.B E2FSPROGS_UNDO_DIR +environment variable. If the directory location is set to the value +.IR none , +.B e2fsck +will not create an undo file. +.SH THE [problems] STANZA +Each tag in the +.I [problems] +stanza names a problem code specified with a leading "0x" followed by +six hex digits. +The value of the tag is a subsection where the relations in that +subsection override the default treatment of that particular problem +code. +.P +Note that inappropriate settings in this stanza may cause +.B e2fsck +to behave incorrectly, or even crash. Most system administrators should +not be making changes to this section without referring to source code. +.P +Within each problem code's subsection, the following tags may be used: +.TP +.I description +This relation allows the message which is printed when this file system +inconsistency is detected to be overridden. +.TP +.I preen_ok +This boolean relation overrides the default behavior controlling +whether this file system problem should be automatically fixed when +.B e2fsck +is running in preen mode. +.TP +.I max_count +This integer relation overrides the +.I max_count_problems +parameter (set in the options section) for this particular problem. +.TP +.I no_ok +This boolean relation overrides the default behavior determining +whether or not the file system will be marked as inconsistent if the user +declines to fix the reported problem. +.TP +.I no_default +This boolean relation overrides whether the default answer for this +problem (or question) should be "no". +.TP +.I preen_nomessage +This boolean relation overrides the default behavior controlling +whether or not the description for this file system problem should +be suppressed when +.B e2fsck +is running in preen mode. +.TP +.I no_nomsg +This boolean relation overrides the default behavior controlling +whether or not the description for this file system problem should +be suppressed when a problem forced not to be fixed, either because +.B e2fsck +is run with the +.B -n +option or because the +.I force_no +flag has been set for the problem. +.TP +.I force_no +This boolean option, if set to true, forces a problem to never be fixed. +That is, it will be as if the user problem responds 'no' to the question +of 'should this problem be fixed?'. The +.I force_no +option even overrides the +.B -y +option given on the command-line (just for the specific problem, of course). +.TP +.I not_a_fix +This boolean option, it set to true, marks the problem as +one where if the user gives permission to make the requested change, +it does not mean that the file system had a problem which has since +been fixed. This is used for requests to optimize the file system's +data structure, such as pruning an extent tree. +@TDB_MAN_COMMENT@.SH THE [scratch_files] STANZA +@TDB_MAN_COMMENT@The following relations are defined in the +@TDB_MAN_COMMENT@.I [scratch_files] +@TDB_MAN_COMMENT@stanza. +@TDB_MAN_COMMENT@.TP +@TDB_MAN_COMMENT@.I directory +@TDB_MAN_COMMENT@If the directory named by this relation exists and is +@TDB_MAN_COMMENT@writeable, then e2fsck will attempt to use this +@TDB_MAN_COMMENT@directory to store scratch files instead of using +@TDB_MAN_COMMENT@in-memory data structures. +@TDB_MAN_COMMENT@.TP +@TDB_MAN_COMMENT@.I numdirs_threshold +@TDB_MAN_COMMENT@If this relation is set, then in-memory data structures +@TDB_MAN_COMMENT@will be used if the number of directories in the file system +@TDB_MAN_COMMENT@are fewer than amount specified. +@TDB_MAN_COMMENT@.TP +@TDB_MAN_COMMENT@.I dirinfo +@TDB_MAN_COMMENT@This relation controls whether or not the scratch file +@TDB_MAN_COMMENT@directory is used instead of an in-memory data +@TDB_MAN_COMMENT@structure for directory information. It defaults to +@TDB_MAN_COMMENT@true. +@TDB_MAN_COMMENT@.TP +@TDB_MAN_COMMENT@.I icount +@TDB_MAN_COMMENT@This relation controls whether or not the scratch file +@TDB_MAN_COMMENT@directory is used instead of an in-memory data +@TDB_MAN_COMMENT@structure when tracking inode counts. It defaults to +@TDB_MAN_COMMENT@true. +.SH LOGGING +E2fsck has the facility to save the information from an e2fsck run in a +directory so that a system administrator can review its output at their +leisure. This allows information captured during the automatic e2fsck +preen run, as well as a manually started e2fsck run, to be saved for +posterity. This facility is controlled by the +.IR log_filename , +.IR log_dir , +.IR log_dir_fallback , +and +.I log_dir_wait +relations in the +.I [options] +stanza. +.PP +The filename in +.I log_filename +may contain the following percent-expressions that will be expanded as +follows. +.TP +.B %d +The current day of the month +.TP +.B %D +The current date; this is a equivalent of +.B %Y%m%d +.TP +.B %h +The hostname of the system. +.TP +.B %H +The current hour in 24-hour format (00..23) +.TP +.B %m +The current month as a two-digit number (01..12) +.TP +.B %M +The current minute (00..59) +.TP +.B %N +The name of the block device containing the file system, with any +directory pathname stripped off. +.TP +.B %p +The pid of the e2fsck process +.TP +.B %s +The current time expressed as the number of seconds since 1970-01-01 +00:00:00 UTC +.TP +.B %S +The current second (00..59) +.TP +.B %T +The current time; this is equivalent of +.B %H%M%S +.TP +.B %u +The name of the user running e2fsck. +.TP +.B %U +This percent expression does not expand to anything, but it signals that +any following date or time expressions should be expressed in UTC time +instead of the local timezone. +.TP +.B %y +The last two digits of the current year (00..99) +.TP +.B %Y +The current year (i.e., 2012). +.SH EXAMPLES +The following recipe will prevent e2fsck from aborting during the boot +process when a file system contains orphaned files. (Of course, this is +not always a good idea, since critical files that are needed for the +security of the system could potentially end up in lost+found, and +starting the system without first having a system administrator check +things out may be dangerous.) +.P +.br + [problems] +.br + 0x040002 = { +.br + preen_ok = true +.br + description = "@u @i %i. " +.br + } +.P +The following recipe will cause an e2fsck logfile to be written to the +directory /var/log/e2fsck, with a filename that contains the device +name, the hostname of the system, the date, and time: e.g., +"e2fsck-sda3.server.INFO.20120314-112142". If the directory containing +/var/log is located on the root file system +which is initially mounted read-only, then the output will be saved in +memory and written out once the root file system has been remounted +read/write. To avoid too much detail from being written to the serial +console (which could potentially slow down the boot sequence), only print +no more than 16 instances of each type of file system corruption. +.P +.br + [options] +.br + max_count_problems = 16 +.br + log_dir = /var/log/e2fsck +.br + log_filename = e2fsck-%N.%h.INFO.%D-%T +.br + log_dir_wait = true +.P +.SH FILES +.TP +.I /etc/e2fsck.conf +The configuration file for +.BR e2fsck (8). +.SH SEE ALSO +.BR e2fsck (8) |