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180 lines
7.4 KiB
180 lines
7.4 KiB
6 years ago
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commit 5b9aaae742a79ef6001e58e5031b5f6ec03fe1ad
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Author: Eric Sandeen <sandeen@redhat.com>
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Date: Fri Jul 4 23:02:59 2014 -0400
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e2fsprogs: reorder flags in chattr(1)
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The flags described in chattr usage() and the chattr(1) manpage
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were in semi-random order, which makes it hard to ascertain
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which flags might be missing or undocumented, and to locate
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flags within the manpage.
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Re-order the list of flags in alphanumeric order, and do
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the same for the flag descriptions in the body of the manpage.
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There should be no content changes here, just reordering
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for consistency.
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Signed-off-by: Eric Sandeen <sandeen@redhat.com>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Reviewed-by: Andreas Dilger <adilger@dilger.ca>
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diff --git a/misc/chattr.1.in b/misc/chattr.1.in
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index 2a3640c..ce426e8 100644
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--- a/misc/chattr.1.in
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+++ b/misc/chattr.1.in
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@@ -19,24 +19,36 @@ chattr \- change file attributes on a Linux file system
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.B chattr
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changes the file attributes on a Linux file system.
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.PP
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-The format of a symbolic mode is +-=[acdeijstuACDST].
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+The format of a symbolic mode is +-=[aAcCdDeijsStTu].
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.PP
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The operator `+' causes the selected attributes to be added to the
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existing attributes of the files; `-' causes them to be removed; and
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`=' causes them to be the only attributes that the files have.
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.PP
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-The letters `acdeijstuACDST' select the new attributes for the files:
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-append only (a), compressed (c), no dump (d), extent format (e), immutable (i),
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-data journalling (j), secure deletion (s), no tail-merging (t),
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-undeletable (u), no atime updates (A), no copy on write (C),
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-synchronous directory updates (D), synchronous updates (S),
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-and top of directory hierarchy (T).
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+The letters `aAcCdDeijsStTu' select the new attributes for the files:
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+append only (a),
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+no atime updates (A),
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+compressed (c),
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+no copy on write (C),
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+no dump (d),
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+synchronous directory updates (D),
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+extent format (e),
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+immutable (i),
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+data journalling (j),
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+secure deletion (s),
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+synchronous updates (S),
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+no tail-merging (t),
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+top of directory hierarchy (T),
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+and undeletable (u).
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.PP
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The following attributes are read-only, and may be listed by
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.BR lsattr (1)
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-but not modified by chattr: huge file (h), compression error (E),
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-indexed directory (I), compression raw access (X), and compressed dirty
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-file (Z).
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+but not modified by chattr:
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+compression error (E),
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+huge file (h),
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+indexed directory (I),
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+compression raw access (X),
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+and compressed dirty file (Z).
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.SH OPTIONS
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.TP
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.B \-R
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@@ -51,14 +63,14 @@ Suppress most error messages.
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.BI \-v " version"
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Set the file's version/generation number.
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.SH ATTRIBUTES
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-When a file with the 'A' attribute set is accessed, its atime record is
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-not modified. This avoids a certain amount of disk I/O for laptop
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-systems.
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-.PP
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A file with the `a' attribute set can only be open in append mode for writing.
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Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE
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capability can set or clear this attribute.
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.PP
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+When a file with the 'A' attribute set is accessed, its atime record is
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+not modified. This avoids a certain amount of disk I/O for laptop
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+systems.
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+.PP
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A file with the `c' attribute set is automatically compressed on the disk
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by the kernel. A read from this file returns uncompressed data. A write to
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this file compresses data before storing them on the disk. Note: please
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@@ -74,27 +86,21 @@ be fully stable. If the 'C' flag is set on a directory, it will have no
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effect on the directory, but new files created in that directory will
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the No_COW attribute.)
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.PP
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-When a directory with the `D' attribute set is modified,
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-the changes are written synchronously on the disk; this is equivalent to
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-the `dirsync' mount option applied to a subset of the files.
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-.PP
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A file with the `d' attribute set is not candidate for backup when the
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.BR dump (8)
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program is run.
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.PP
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-The 'E' attribute is used by the experimental compression patches to
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-indicate that a compressed file has a compression error. It may not be
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-set or reset using
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-.BR chattr (1),
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-although it can be displayed by
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-.BR lsattr (1).
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+When a directory with the `D' attribute set is modified,
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+the changes are written synchronously on the disk; this is equivalent to
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+the `dirsync' mount option applied to a subset of the files.
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.PP
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The 'e' attribute indicates that the file is using extents for mapping
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the blocks on disk. It may not be removed using
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.BR chattr (1).
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.PP
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-The 'I' attribute is used by the htree code to indicate that a directory
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-is being indexed using hashed trees. It may not be set or reset using
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+The 'E' attribute is used by the experimental compression patches to
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+indicate that a compressed file has a compression error. It may not be
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+set or reset using
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.BR chattr (1),
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although it can be displayed by
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.BR lsattr (1).
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@@ -111,6 +117,12 @@ renamed, no link can be created to this file and no data can be written
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to the file. Only the superuser or a process possessing the
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CAP_LINUX_IMMUTABLE capability can set or clear this attribute.
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.PP
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+The 'I' attribute is used by the htree code to indicate that a directory
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+is being indexed using hashed trees. It may not be set or reset using
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+.BR chattr (1),
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+although it can be displayed by
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+.BR lsattr (1).
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+.PP
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A file with the `j' attribute has all of its data written to the ext3
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or ext4 journal before being written to the file itself, if the filesystem
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is mounted with the "data=ordered" or "data=writeback" options. When the
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@@ -127,6 +139,13 @@ When a file with the `S' attribute set is modified,
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the changes are written synchronously on the disk; this is equivalent to
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the `sync' mount option applied to a subset of the files.
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.PP
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+A file with the 't' attribute will not have a partial block fragment at
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+the end of the file merged with other files (for those filesystems which
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+support tail-merging). This is necessary for applications such as LILO
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+which read the filesystem directly, and which don't understand tail-merged
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+files. Note: As of this writing, the ext2 or ext3 filesystems do not
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+(yet, except in very experimental patches) support tail-merging.
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+.PP
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A directory with the 'T' attribute will be deemed to be the top of
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directory hierarchies for the purposes of the Orlov block allocator.
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This is a hint to the block allocator used by ext3 and ext4 that the
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@@ -137,13 +156,6 @@ and /home/mary are placed into separate block groups. For directories
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where this attribute is not set, the Orlov block allocator will try to
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group subdirectories closer together where possible.
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.PP
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-A file with the 't' attribute will not have a partial block fragment at
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-the end of the file merged with other files (for those filesystems which
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-support tail-merging). This is necessary for applications such as LILO
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-which read the filesystem directly, and which don't understand tail-merged
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-files. Note: As of this writing, the ext2 or ext3 filesystems do not
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-(yet, except in very experimental patches) support tail-merging.
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-.PP
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When a file with the `u' attribute set is deleted, its contents are
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saved. This allows the user to ask for its undeletion. Note: please
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make sure to read the bugs and limitations section at the end of this
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diff --git a/misc/chattr.c b/misc/chattr.c
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index 39a6016..d5a6a61 100644
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--- a/misc/chattr.c
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+++ b/misc/chattr.c
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@@ -83,7 +83,7 @@ static unsigned long sf;
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static void usage(void)
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{
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fprintf(stderr,
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- _("Usage: %s [-RVf] [-+=AaCcDdeijsSu] [-v version] files...\n"),
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+ _("Usage: %s [-RVf] [-+=aAcCdDeijsSu] [-v version] files...\n"),
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program_name);
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exit(1);
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}
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