54 lines
1.9 KiB
ReStructuredText
54 lines
1.9 KiB
ReStructuredText
Common Linux features
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=====================
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The Linux operating system implements a POSIX standard interfaces and API with
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additional interfaces. Many of them have become common in other filesystems. The
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ones listed below have been added relatively recently and are considered
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interesting for users:
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birth/origin inode time
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a timestamp associated with an inode of when it was created, cannot be
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changed and requires the *statx* syscall to be read
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statx
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an extended version of the *stat* syscall that provides extensible
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interface to read more information that are not available in original
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*stat*
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fallocate modes
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the *fallocate* syscall allows to manipulate file extents
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Supported modes:
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- keep size (FALLOC_FL_KEEP_SIZE)
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- hole punching (FALLOC_FL_PUNCH_HOLE)
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- zero range (FALLOC_FL_ZERO_RANGE)
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FIEMAP
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an ioctl that enumerates file extents, related tool is :command:`filefrag`
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filesystem label
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another filesystem identification, could be used for mount or for better
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recognition, can be set or read by an ioctl or by command :command:`btrfs filesystem label`
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O_TMPFILE
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mode of open() syscall that creates a file with no associated directory
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entry, which makes it impossible to be seen by other processes and is
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thus safe to be used as a temporary file
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(https://lwn.net/Articles/619146/)
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xattr, acl
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extended attributes (xattr) is a list of *key=value* pairs associated
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with a file, usually storing additional metadata related to security,
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access control list in particular (ACL) or properties (:command:`btrfs property`)
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cross-rename
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mode of *renameat2* syscall that can atomically swap 2 directory
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entries (files/directories/subvolumes/symlinks) within the same filesystem
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File attributes, XFLAGS
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-----------------------
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.. include:: ch-file-attributes.rst
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