Messages in this thread Patch in this message | | | Date | Wed, 8 Feb 2006 15:08:39 -0500 | From | Ulrich Drepper <> | Subject | [PATCH] fstatat64 support |
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The *at patches introduced fstatat and, due to inusfficient research, I used the newfstat functions generally as the guideline. The result is that on 32-bit platforms we don't have all the information needed to implement fstatat64.
This patch modifies the code to pass up 64-bit information if __ARCH_WANT_STAT64 is defined. I renamed the syscall entry point to make this clear. Other archs will continue to use the existing code. On x86-64 the compat code is implemented using a new sys32_ function. this is what is done for the other stat syscalls as well.
This patch might break some other archs (those which define __ARCH_WANT_STAT64 and which already wired up the syscall). Yet others might need changes to accomodate the compatibility mode. I really don't want to do that work because all this stat handling is a mess (more so in glibc, but the kernel is also affected). It should be done by the arch maintainers. I'll provide some stand-alone test shortly. Those who are eager could compile glibc and run 'make check' (no installation needed).
The patch below has been tested on x86 and x86-64.
Signed-off-by: Ulrich Drepper <drepper@redhat.com>
--- linux-2.6.15.i686/arch/i386/kernel/syscall_table.S-at 2006-02-06 13:11:24.000000000 -0800 +++ linux-2.6.15.i686/arch/i386/kernel/syscall_table.S 2006-02-06 13:11:34.000000000 -0800 @@ -299,7 +299,7 @@ .long sys_mknodat .long sys_fchownat .long sys_futimesat - .long sys_newfstatat /* 300 */ + .long sys_newfstatat64 /* 300 */ .long sys_unlinkat .long sys_renameat .long sys_linkat --- linux-2.6.15.i686/arch/x86_64/ia32/ia32entry.S-at 2006-02-06 13:05:04.000000000 -0800 +++ linux-2.6.15.i686/arch/x86_64/ia32/ia32entry.S 2006-02-06 13:05:21.000000000 -0800 @@ -677,7 +677,7 @@ .quad sys_mknodat .quad sys_fchownat .quad compat_sys_futimesat - .quad compat_sys_newfstatat /* 300 */ + .quad sys32_fstatat /* 300 */ .quad sys_unlinkat .quad sys_renameat .quad sys_linkat --- linux-2.6.15.i686/arch/x86_64/ia32/sys_ia32.c-at 2006-02-06 13:05:37.000000000 -0800 +++ linux-2.6.15.i686/arch/x86_64/ia32/sys_ia32.c 2006-02-06 13:08:30.000000000 -0800 @@ -180,6 +180,28 @@ return ret; } +asmlinkage long +sys32_fstatat(unsigned int dfd, char __user *filename, + struct stat64 __user* statbuf, int flag) +{ + struct kstat stat; + int error = -EINVAL; + + if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) + goto out; + + if (flag & AT_SYMLINK_NOFOLLOW) + error = vfs_lstat_fd(dfd, filename, &stat); + else + error = vfs_stat_fd(dfd, filename, &stat); + + if (!error) + error = cp_stat64(statbuf, &stat); + +out: + return error; +} + /* * Linux/i386 didn't use to be able to handle more than * 4 system call parameters, so these system calls used a memory --- linux-2.6.15.i686/fs/stat.c-at 2006-02-06 12:55:52.000000000 -0800 +++ linux-2.6.15.i686/fs/stat.c 2006-02-06 13:13:43.000000000 -0800 @@ -261,6 +261,7 @@ return error; } +#ifndef __ARCH_WANT_STAT64 asmlinkage long sys_newfstatat(int dfd, char __user *filename, struct stat __user *statbuf, int flag) { @@ -281,6 +282,7 @@ out: return error; } +#endif asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf) { @@ -395,6 +397,26 @@ return error; } +asmlinkage long sys_newfstatat64(int dfd, char __user *filename, + struct stat64 __user *statbuf, int flag) +{ + struct kstat stat; + int error = -EINVAL; + + if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) + goto out; + + if (flag & AT_SYMLINK_NOFOLLOW) + error = vfs_lstat_fd(dfd, filename, &stat); + else + error = vfs_stat_fd(dfd, filename, &stat); + + if (!error) + error = cp_new_stat64(&stat, statbuf); + +out: + return error; +} #endif /* __ARCH_WANT_STAT64 */ void inode_add_bytes(struct inode *inode, loff_t bytes) --- linux-2.6.15.i686/include/asm-i386/unistd.h-at 2006-02-06 13:16:26.000000000 -0800 +++ linux-2.6.15.i686/include/asm-i386/unistd.h 2006-02-06 13:16:42.000000000 -0800 @@ -305,7 +305,7 @@ #define __NR_mknodat 297 #define __NR_fchownat 298 #define __NR_futimesat 299 -#define __NR_newfstatat 300 +#define __NR_newfstatat64 300 #define __NR_unlinkat 301 #define __NR_renameat 302 #define __NR_linkat 303 --- linux-2.6.15.i686/include/asm-x86_64/ia32_unistd.h-at 2006-02-06 13:16:51.000000000 -0800 +++ linux-2.6.15.i686/include/asm-x86_64/ia32_unistd.h 2006-02-06 13:17:00.000000000 -0800 @@ -305,7 +305,7 @@ #define __NR_ia32_mknodat 297 #define __NR_ia32_fchownat 298 #define __NR_ia32_futimesat 299 -#define __NR_ia32_newfstatat 300 +#define __NR_ia32_newfstatat64 300 #define __NR_ia32_unlinkat 301 #define __NR_ia32_renameat 302 #define __NR_ia32_linkat 303 --- linux-2.6.15.i686/include/linux/syscalls.h-at 2006-02-06 12:56:58.000000000 -0800 +++ linux-2.6.15.i686/include/linux/syscalls.h 2006-02-06 13:14:15.000000000 -0800 @@ -557,6 +557,8 @@ int mode); asmlinkage long sys_newfstatat(int dfd, char __user *filename, struct stat __user *statbuf, int flag); +asmlinkage long sys_newfstatat64(int dfd, char __user *filename, + struct stat64 __user *statbuf, int flag); asmlinkage long sys_readlinkat(int dfd, const char __user *path, char __user *buf, int bufsiz); asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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