ustat - get filesystem statistics
ustat() returns information about a mounted filesystem.
dev is a device number identifying a device containing a mounted filesystem.
ubuf is a pointer to a
ustat structure that contains the following members:
daddr_t f_tfree; /* Total free blocks */ ino_t f_tinode; /* Number of free inodes */ char f_fname; /* Filsys name */ char f_fpack; /* Filsys pack name */
The last two fields,
f_fpack, are not implemented and will always be filled with null bytes ('\0').
On success, zero is returned and the
ustat structure pointed to by
ubuf will be filled in. On error, -1 is returned, and
errno is set appropriately.
ubuf points outside of your accessible address space.
dev does not refer to a device containing a mounted filesystem.
The mounted filesystem referenced by
dev does not support this operation, or any version of Linux before 1.3.16.
The HP-UX version of the
ustat structure has an additional field,
f_blksize, that is unknown elsewhere. HP-UX warns: For some filesystems, the number of free inodes does not change. Such filesystems will return -1 in the field
f_tinode. For some filesystems, inodes are dynamically allocated. Such filesystems will return the current number of free inodes.
This page is part of release 4.15 of the Linux
man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.