.\" .TH RESIZE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
.TH RESIZE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
.SH NAME
-resize2fs \- ext2/ext3 file system resizer
+resize2fs \- ext2/ext3/ext4 file system resizer
.SH SYNOPSIS
.B resize2fs
[
-.B \-d
+.B \-fFpPM
+]
+[
+.B \-d
.I debug-flags
]
[
.B \-S
.I RAID-stride
]
-[
-.B \-f
-]
-[
-.B \-F
-]
-[
-.B \-p
-]
.I device
[
.I size
]
.SH DESCRIPTION
-The
-.B resize2fs
-program will resize ext2 or ext3 file systems. It can be used to enlarge or
-shrink an unmounted file system located on
+The
+.B resize2fs
+program will resize ext2, ext3, or ext4 file systems. It can be used to
+enlarge or shrink an unmounted file system located on
.IR device .
If the filesystem is mounted, it can be used to expand the size of the
mounted filesystem, assuming the kernel supports on-line resizing. (As
of this writing, the Linux 2.6 kernel supports on-line resize for
-filesystems mounted using ext3 only.).
+filesystems mounted using ext3 and ext4.).
.PP
-The
+The
.I size
parameter specifies the requested new size of the filesystem.
If no units are specified, the units of the
.I size
parameter shall be the filesystem blocksize of the filesystem.
-Optionally, the
+Optionally, the
.I size
-parameter may be suffixed by one of the following the units
+parameter may be suffixed by one of the following the units
designators: 's', 'K', 'M', or 'G',
for 512 byte sectors, kilobytes, megabytes, or gigabytes, respectively.
-The
+The
.I size
of the filesystem may never be larger than the size of the partition.
-If
+If
.I size
parameter is not specified, it will default to the size of the partition.
.PP
+Note: when kilobytes is used above, I mean
+.IR real ,
+power-of-2 kilobytes, (i.e., 1024 bytes), which some politically correct
+folks insist should be the stupid-sounding ``kibibytes''. The same
+holds true for megabytes, also sometimes known as ``mebibytes'', or
+gigabytes, as the amazingly silly ``gibibytes''. Makes you want to
+gibber, doesn't it?
+.PP
The
.B resize2fs
program does not manipulate the size of partitions. If you wish to enlarge
-a filesystem, you must first make sure you can expand the size of the
-underlying partition first. This can be done using
+a filesystem, you must make sure you can expand the size of the
+underlying partition first. This can be done using
.BR fdisk (8)
by deleting the partition and recreating it with a larger size or using
.BR lvextend (8),
if you're using the logical volume manager
.BR lvm (8).
-When
+When
recreating the partition, make sure you create it with the same starting
-disk cylinder as before! Otherwise, the resize operation will
-certainly not work, and you may lose your entire filesystem.
+disk cylinder as before! Otherwise, the resize operation will
+certainly not work, and you may lose your entire filesystem.
After running
.BR fdisk (8),
-run resize2fs to resize the ext2 filesystem
+run resize2fs to resize the ext2 filesystem
to use all of the space in the newly enlarged partition.
.PP
-If you wish to shrink an ext2 partition, first use
+If you wish to shrink an ext2 partition, first use
.B resize2fs
-to shrink the size of filesystem. Then you may use
+to shrink the size of filesystem. Then you may use
.BR fdisk (8)
-to shrink the size of the partition. When shrinking the size of
-the partition, make sure you do not make it smaller than the new size
+to shrink the size of the partition. When shrinking the size of
+the partition, make sure you do not make it smaller than the new size
of the ext2 filesystem!
.SH OPTIONS
.TP
.B \-d \fIdebug-flags
-Turns on various resize2fs debugging features, if they have been compiled
+Turns on various resize2fs debugging features, if they have been compiled
into the binary.
.I debug-flags
-should be computed by adding the numbers of the desired features
+should be computed by adding the numbers of the desired features
from the following list:
.br
-\ 1\ \-\ Print out all disk I/O
-.br
-\ 2\ \-\ Debug block relocations
+ 2 \-\ Debug block relocations
.br
-\ 8\ \-\ Debug inode relocations
+ 4 \-\ Debug inode relocations
.br
-\ 16\ \-\ Debug moving the inode table
-.TP
-.B \-S \fIRAID-stride
-The
-.B resize2fs
-program will hueristically determine the RAID stride that was specified
-when the filesystem was created. This option allows the user to
-explicitly specify a RAID stride setting to be used by resize2fs instead.
-.TP
-.B \-p
-Prints out a percentage completion bars for each
-.B resize2fs
-operation, so that the user can keep track of what
-the program is doing.
+ 8 \-\ Debug moving the inode table
.TP
.B \-f
-Forces resize2fs to proceed with the filesystem resize operation, overriding
+Forces resize2fs to proceed with the filesystem resize operation, overriding
some safety checks which resize2fs normally enforces.
.TP
.B \-F
Flush the filesystem device's buffer caches before beginning. Only
-really useful for doing
+really useful for doing
.B resize2fs
time trials.
+.TP
+.B \-M
+Shrink the filesystem to the minimum size.
+.TP
+.B \-p
+Prints out a percentage completion bars for each
+.B resize2fs
+operation during an offline resize, so that the user can keep track
+of what the program is doing.
+.TP
+.B \-P
+Print the minimum size of the filesystem and exit.
+.TP
+.B \-S \fIRAID-stride
+The
+.B resize2fs
+program will heuristically determine the RAID stride that was specified
+when the filesystem was created. This option allows the user to
+explicitly specify a RAID stride setting to be used by resize2fs instead.
+.SH KNOWN BUGS
+The minimum size of the filesystem as estimated by resize2fs may be
+incorrect, especially for filesystems with 1k and 2k blocksizes.
.SH AUTHOR
.B resize2fs
was written by Theodore Ts'o <tytso@mit.edu>.
.SH COPYRIGHT
Resize2fs is Copyright 1998 by Theodore Ts'o and PowerQuest, Inc. All
-rights reserved.
+rights reserved.
As of April, 2000
.B Resize2fs
may be redistributed under the terms of the GPL.
.BR fdisk (8),
.BR e2fsck (8),
.BR mke2fs (8),
-.BR lvm (8),
+.BR lvm (8),
.BR lvextend (8)
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff