> mknod takes a 32bit input
> the stat64 padding only has room for 32bits
Hmm. You make me search for this old patch.
Since Linus' reaction was not exactly positive I left
the topic again, but there must be a copy somewhere..
Aha, found it. Mail from March 24.
==================================================================
...
- For stat all is fine already since we got stat64.
- For mknod a little work is required.
- The state of affairs with loopinfo is sad today (the fact that
kernel and glibc use dev_t of different size causes problems)
but all will be well with 64-bit dev_t.
...
(iii) mknod:
Then there is the prototype of mknod.
I changed it for all filesystems to
diff -r linux-2.4.2/linux/fs/ext2/namei.c linux-2.4.2kdevt/linux/fs/ext2/namei.c
387c387,388
< static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
--- > static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, > dev_t rdev)The system call itself cannot easily be changed to take a larger dev_t, mostly because under old glibc the high order part would be random. So, mknod64, with
diff linux-2.4.2/linux/fs/namei.c linux-2.4.2kdevt/linux/fs/namei.c 1205c1208 < asmlinkage long sys_mknod(const char * filename, int mode, dev_t dev)
--- > static long mknod_common(const char * filename, int mode, dev_t dev) 1245a1249,1259 > } > > asmlinkage long sys_mknod64(const char * filename, int mode, > unsigned int ma, unsigned int mi) > { > return mknod_common(filename, mode, ((dev_t) ma << 32) | mi); > } ... ==================================================================Yes, so mknod is solved by having mknod64. I saw no problems with stat64, but you do. Hmm. I was running a system with 64-bit dev_t when I wrote that letter, so at least for i386 there cannot be any serious problems. Let me see.
=================== include/asm-i386/stat.h ====================== /* This matches struct stat64 in glibc2.1, hence the absolutely * insane amounts of padding around dev_t's. */ struct stat64 { unsigned short st_dev; unsigned char __pad0[10]; ... unsigned short st_rdev; unsigned char __pad3[10]; ... ==================================================================
So, it seems that you are too pessimistic. The present stat64 structure even allows 96-bit dev_t.
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