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statx: allow system call to be invoked from io_uring 

This is a prepatory patch to allow io_uring to invoke statx directly.

Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bijan Mottahedeh 2020-05-22 21:31:17 -07:00 committed by Jens Axboe
parent 1d9e128803
commit 0018784fc8
2 changed files with 21 additions and 13 deletions
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2
fs/internal.h
View File

@ -188,3 +188,5 @@ int sb_init_dio_done_wq(struct super_block *sb);
*/
unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, int flags);
int cp_statx(const struct kstat *stat, struct statx __user *buffer);
int do_statx(int dfd, const char __user *filename, unsigned flags,
unsigned int mask, struct statx __user *buffer);

32
fs/stat.c
View File

@ -567,6 +567,24 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer)
return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
int do_statx(int dfd, const char __user *filename, unsigned flags,
unsigned int mask, struct statx __user *buffer)
{
struct kstat stat;
int error;
if (mask & STATX__RESERVED)
return -EINVAL;
if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
return -EINVAL;
error = vfs_statx(dfd, filename, flags, &stat, mask);
if (error)
return error;
return cp_statx(&stat, buffer);
}
/**
* sys_statx - System call to get enhanced stats
* @dfd: Base directory to pathwalk from *or* fd to stat.
@ -583,19 +601,7 @@ SYSCALL_DEFINE5(statx,
unsigned int, mask,
struct statx __user *, buffer)
{
struct kstat stat;
int error;
if (mask & STATX__RESERVED)
return -EINVAL;
if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
return -EINVAL;
error = vfs_statx(dfd, filename, flags, &stat, mask);
if (error)
return error;
return cp_statx(&stat, buffer);
return do_statx(dfd, filename, flags, mask, buffer);
}
#ifdef CONFIG_COMPAT