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POSIX file permissions ... Variable file block size [bo] Allocate-on-flush Copy on write Trim support OS support ... 4 TiB (4.398 TB) [df] 64 ...
POSIX mandates 512-byte default block sizes for the df and du utilities, reflecting the typical size of blocks on disks. When Richard Stallman and the GNU team were implementing POSIX for the GNU operating system , they objected to this on the grounds that most people think in terms of 1024 byte (or 1 KiB ) blocks.
Block addresses are generalized 64-bit pointers that reference (node, drive, blknum) tuples. The native block size is 8192 bytes; inodes are 512 bytes on disk (for disks with 512 byte sectors) or 8KB (for disks with 4KB sectors). One distinctive characteristic of OneFS is that metadata is spread throughout the nodes in a homogeneous fashion.
Block [12] 2015 [13] JuiceFS: Go Apache License 2.0 POSIX, FUSE, HDFS, S3: Yes Yes Reed-Solomon Object 2021 Kertish-DFS: Go GPLv3 HTTP(REST), CLI, C# Client, Go Client Yes Replication 2020 LizardFS [14] C++ GPLv3 POSIX, FUSE, NFS-Ganesha, Ceph FSAL (via libcephfs) master No Reed-Solomon [15] File [16] 2013 Lustre: C GPLv2 POSIX, NFS-Ganesha ...
df (abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access. df is typically implemented using the statfs or statvfs system calls .
CephFS was merged into the Linux kernel in 2010. Ceph's foundation is the reliable autonomic distributed object store (RADOS), which provides object storage via programmatic interface and S3 or Swift REST APIs, block storage to QEMU/KVM/Linux hosts, and POSIX filesystem storage which can be mounted by Linux kernel and FUSE clients. Chiron FS ...
Utilities listed in POSIX.1-2017 This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
In the stat structure, file type and permissions (the mode) are stored together in a st_mode bit field, which has a size of at least 12 bits (3 bits to specify the type among the seven possible types of files; 9 bits for permissions). The layout for permissions is defined by POSIX to be at the least-significant 9 bits, but the rest is undefined ...