.I version
]
[
+.B \-p
+.I project
+]
+[
.I mode
]
.I files...
.B chattr
changes the file attributes on a Linux file system.
.PP
-The format of a symbolic mode is +-=[aAcCdDeijsStTu].
+The format of a symbolic mode is +-=[aAcCdDeijPsStTu].
.PP
The operator '+' causes the selected attributes to be added to the
existing attributes of the files; '-' causes them to be removed; and '='
causes them to be the only attributes that the files have.
.PP
-The letters 'aAcCdDeijsStTu' select the new attributes for the files:
+The letters 'aAcCdDeFijPsStTu' select the new attributes for the files:
append only (a),
no atime updates (A),
compressed (c),
no dump (d),
synchronous directory updates (D),
extent format (e),
+case-insensitive directory lookups (F),
immutable (i),
data journalling (j),
+project hierarchy (P),
secure deletion (s),
synchronous updates (S),
no tail-merging (t),
The following attributes are read-only, and may be listed by
.BR lsattr (1)
but not modified by chattr:
-compression error (E),
-huge file (h),
+encrypted (E),
indexed directory (I),
-inline data (N),
-compression raw access (X),
-and compressed dirty file (Z).
+and inline data (N).
.PP
Not all flags are supported or utilized by all filesystems; refer to
filesystem-specific man pages such as
.TP
.BI \-v " version"
Set the file's version/generation number.
+.TP
+.BI \-p " project"
+Set the file's project number.
.SH ATTRIBUTES
A file with the 'a' attribute set can only be open in append mode for writing.
Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE
data blocks, it is undefined when the blocks assigned to the file will
be fully stable. If the 'C' flag is set on a directory, it will have no
effect on the directory, but new files created in that directory will
-the No_COW attribute.)
+have the No_COW attribute set.)
.PP
A file with the 'd' attribute set is not candidate for backup when the
.BR dump (8)
although it can be displayed by
.BR lsattr (1).
.PP
-The 'h' attribute indicates the file is storing its blocks in units of the
-filesystem blocksize instead of in units of sectors, and means that the file
-is (or at one time was) larger than 2TB. It may not be set or reset using
-.BR chattr (1),
-although it can be displayed by
-.BR lsattr (1).
+A directory with the 'F' attribute set indicates that all the path
+lookups inside that directory are made in a case-insensitive fashion.
+This attribute can only be changed in empty directories on file systems
+with the fname_encoding feature enabled.
.PP
A file with the 'i' attribute cannot be modified: it cannot be deleted or
-renamed, no link can be created to this file and no data can be written
-to the file. Only the superuser or a process possessing the
-CAP_LINUX_IMMUTABLE capability can set or clear this attribute.
+renamed, no link can be created to this file, most of the file's
+metadata can not be modified, and the file can not be opened in write mode.
+Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE
+capability can set or clear this attribute.
.PP
The 'I' attribute is used by the htree code to indicate that a directory
is being indexed using hashed trees. It may not be set or reset using
although it can be displayed by
.BR lsattr (1).
.PP
-A file with the 'j' attribute has all of its data written to the ext3
-or ext4 journal before being written to the file itself, if the filesystem
-is mounted with the "data=ordered" or "data=writeback" options. When the
-filesystem is mounted with the "data=journal" option all file data
-is already journalled and this attribute has no effect. Only
-the superuser or a process possessing the CAP_SYS_RESOURCE
-capability can set or clear this attribute.
+A file with the 'j' attribute has all of its data written to the ext3 or
+ext4 journal before being written to the file itself, if the file system
+is mounted with the "data=ordered" or "data=writeback" options and the
+file system has a journal. When the filesystem is mounted with the
+"data=journal" option all file data is already journalled and this
+attribute has no effect. Only the superuser or a process possessing the
+CAP_SYS_RESOURCE capability can set or clear this attribute.
.PP
A file with the 'N' attribute set indicates that the file has data
stored inline, within the inode itself. It may not be set or reset using
although it can be displayed by
.BR lsattr (1).
.PP
+A directory with the 'P' attribute set will enforce a hierarchical
+structure for project id's. This means that files and directory created
+in the directory will inherit the project id of the directory, rename
+operations are constrained so when a file or directory is moved into
+another directory, that the project id's much match. In addition, a
+hard link to file can only be created when the project id for the file
+and the destination directory match.
+.PP
When a file with the 's' attribute set is deleted, its blocks are zeroed
and written back to the disk. Note: please make sure to read the bugs
and limitations section at the end of this document.
make sure to read the bugs and limitations section at the end of this
document.
.PP
-The 'X' attribute is used by the experimental compression patches to
-indicate that the raw contents of a compressed file can be accessed
-directly. It currently may not be set or reset using
-.BR chattr (1),
-although it can be displayed by
-.BR lsattr (1).
-.PP
-The 'Z' attribute is used by the experimental compression patches to
-indicate a compressed file is dirty. It may not be set or reset using
-.BR chattr (1),
-although it can be displayed by
-.BR lsattr (1).
-.PP
.SH AUTHOR
.B chattr
was written by Remy Card <Remy.Card@linux.org>. It is currently being
The 'c', 's', and 'u' attributes are not honored
by the ext2, ext3, and ext4 filesystems as implemented in the current
mainline Linux kernels.
+Setting 'a' and 'i' attributes will not affect the ability to write
+to already existing file descriptors.
.PP
-The 'j' option is only useful if the filesystem is mounted as ext3 or ext4.
+The 'j' option is only useful for ext3 and ext4 file systems.
.PP
The 'D' option is only useful on Linux kernel 2.5.19 and later.
.SH AVAILABILITY
projects / thirdparty / e2fsprogs.git / blobdiff