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fs: follow symlinks like Linux; Linux mknod; /proc/partitions

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Symlinks are followed in namex_from() now, in the middle of a path as
well as at the end, and a relative target resolves from the directory
that holds the link rather than from the caller's cwd. `ln -s f d1/s;
cat d1/s` said "Symbolic link loop" because it looked for ./f. A loop is
ELOOP after 40 links, a dangling link ENOENT, and open(O_CREAT) through
a link to a file opens the file. divesymlink() is gone.

mknod from a Linux program passes (mode, dev) where the native call
passes (major, minor), and was read as the native one: `mknod n c 1 2`
made node 432,258, and mkfifo made a character device. Both are decoded
now; a FIFO is EPERM, and an existing name is EEXIST.

/proc/mounts listed devtmpfs twice: once from a fixed line and once
from the mount table. The fixed line is gone, and mount_add() refuses
a filesystem mounted on its own root, which is where a second devtmpfs
mount lands. A read-only FAT mount says ro.

/proc/partitions exists, in Linux's format, and /proc/filesystems lists
vfat.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-23 10:50:41 +02:00
commit 7a1e63a553
8 changed files with 274 additions and 136 deletions
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30
kernel/dev/blkdev.c
View file

@ -372,23 +372,35 @@ putu(char *buf, int cap, int off, uint64 v)
return off;
}
// putu(), right-aligned in `w` columns, the way printf("%*llu") would.
static int
putw(char *buf, int cap, int off, uint64 v, int w)
{
int n = 1;
for (uint64 t = v; t >= 10; t /= 10)
n++;
for (; w > n; w--)
off = put(buf, cap, off, " ");
return putu(buf, cap, off, v);
}
// /proc/partitions, in Linux's format to the column, because that is what
// reads it: lsblk's fallback, fdisk -l, every installer and rescue script.
// Sizes are in 1 KB blocks. The major is 8 for all of them, the one devtmpfs
// gives every disk here, and the minor is the device number, as in /dev.
int
blkdev_info(char *buf, int cap)
{
int off = put(buf, cap, 0, "dev name MB type\n");
int off = put(buf, cap, 0, "major minor #blocks name\n\n");
for (int s = 0; s < NBLKDEV; s++) {
struct blkdev *d = &devs[s];
if (!d->used)
continue;
off = putu(buf, cap, off, BLKDEV_FIRST + s);
off = put(buf, cap, off, " ");
off = putw(buf, cap, off, 8, 4);
off = putw(buf, cap, off, BLKDEV_FIRST + s, 8);
off = putw(buf, cap, off, (d->nsectors * d->secsize) >> 10, 11);
off = put(buf, cap, off, " ");
off = put(buf, cap, off, d->name);
for (int pad = 12 - strlen(d->name); pad > 0; pad--)
off = put(buf, cap, off, " ");
off = putu(buf, cap, off, (d->nsectors * d->secsize) >> 20);
off = put(buf, cap, off, d->parent < 0 ? " disk" :
d->schfs > 0 ? " schfs" :
d->schfs < 0 ? " fat" : " part");
off = put(buf, cap, off, "\n");
}
return off;