89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/statvfs.h>
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#include "../internal/syscall.h"
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#if VLIBC_LEVEL_GE(2)
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/*
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* Linux struct statfs (kernel ABI, x86_64; linux/statfs.h). Layout and
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* sizes are LP64 facts: f_type..f_ffree are longs, f_fsid is an int pair,
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* then f_namelen/f_frsize/f_flags/f_spare[4] complete the 120 bytes the
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* kernel copies out (the same layout src/misc/pathconf.c pins for
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* pathconf()/fpathconf()). The signed kernel longs are non-negative on
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* every real filesystem, so they convert straight into the unsigned POSIX
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* counts below.
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*/
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struct vlibc_kstatfs
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{
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long f_type;
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long f_bsize;
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long f_blocks;
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long f_bfree;
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long f_bavail;
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long f_files;
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long f_ffree;
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int f_fsid[2];
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long f_namelen;
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long f_frsize;
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long f_flags;
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long f_spare[4];
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};
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/* Map one kernel statfs record into the portable POSIX statvfs view. */
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static void
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statvfs_fill(struct statvfs *out, const struct vlibc_kstatfs *in)
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{
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out->f_bsize = (unsigned long)in->f_bsize;
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out->f_frsize = in->f_frsize != 0 ? (unsigned long)in->f_frsize : (unsigned long)in->f_bsize;
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out->f_blocks = (unsigned long)in->f_blocks;
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out->f_bfree = (unsigned long)in->f_bfree;
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out->f_bavail = (unsigned long)in->f_bavail;
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out->f_files = (unsigned long)in->f_files;
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out->f_ffree = (unsigned long)in->f_ffree;
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out->f_favail = (unsigned long)in->f_ffree;
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/* Reconstruct the kernel's 64-bit fsid (val[0] holds the low word on
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* the little-endian x86_64; the same packing glibc's statvfs reports). */
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out->f_fsid = ((unsigned long)(unsigned int)in->f_fsid[1] << 32) |
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(unsigned long)(unsigned int)in->f_fsid[0];
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out->f_flag = (unsigned long)(in->f_flags & (ST_RDONLY | ST_NOSUID));
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out->f_namemax = (unsigned long)in->f_namelen;
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}
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/*
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* statvfs()/fstatvfs(): filesystem statistics in the portable POSIX shape,
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* over SYS_statfs/SYS_fstatfs (which share the same kernel struct and the
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* same mapping). The kernel returns 0 on success after filling all 120
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* bytes; failures come back as -errno and are translated by syscall_ret.
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*/
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int
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statvfs(const char *restrict path, struct statvfs *restrict buf)
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{
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struct vlibc_kstatfs fs;
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if (syscall_ret(__syscall2(SYS_statfs, (long)path, (long)&fs)) != 0)
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{
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return -1;
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}
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statvfs_fill(buf, &fs);
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return 0;
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}
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int
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fstatvfs(int fildes, struct statvfs *buf)
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{
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struct vlibc_kstatfs fs;
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if (syscall_ret(__syscall2(SYS_fstatfs, fildes, (long)&fs)) != 0)
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{
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return -1;
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}
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statvfs_fill(buf, &fs);
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return 0;
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}
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#endif /* VLIBC_LEVEL_GE(2) */
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