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fs: make two stat prep helpers available 

To implement an async stat, we need to provide the flags mapping and
the statx user copy. Make them available internally, through
fs/internal.h.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-12-14 13:26:33 -07:00
parent 05f3fb3c53
commit 3934e36f60
2 changed files with 28 additions and 12 deletions
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6
fs/internal.h
View File

@ -190,3 +190,9 @@ extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
/* direct-io.c: */
int sb_init_dio_done_wq(struct super_block *sb);
/*
* fs/stat.c:
*/
unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, int flags);
int cp_statx(const struct kstat *stat, struct statx __user *buffer);

34
fs/stat.c
View File

@ -21,6 +21,8 @@
#include <linux/uaccess.h>
#include <asm/unistd.h>
#include "internal.h"
/**
* generic_fillattr - Fill in the basic attributes from the inode struct
* @inode: Inode to use as the source
@ -150,6 +152,23 @@ int vfs_statx_fd(unsigned int fd, struct kstat *stat,
}
EXPORT_SYMBOL(vfs_statx_fd);
inline unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, int flags)
{
if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0)
return -EINVAL;
*lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;
if (flags & AT_SYMLINK_NOFOLLOW)
*lookup_flags &= ~LOOKUP_FOLLOW;
if (flags & AT_NO_AUTOMOUNT)
*lookup_flags &= ~LOOKUP_AUTOMOUNT;
if (flags & AT_EMPTY_PATH)
*lookup_flags |= LOOKUP_EMPTY;
return 0;
}
/**
* vfs_statx - Get basic and extra attributes by filename
* @dfd: A file descriptor representing the base dir for a relative filename
@ -170,19 +189,10 @@ int vfs_statx(int dfd, const char __user *filename, int flags,
{
struct path path;
int error = -EINVAL;
unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;
unsigned lookup_flags;
if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0)
if (vfs_stat_set_lookup_flags(&lookup_flags, flags))
return -EINVAL;
if (flags & AT_SYMLINK_NOFOLLOW)
lookup_flags &= ~LOOKUP_FOLLOW;
if (flags & AT_NO_AUTOMOUNT)
lookup_flags &= ~LOOKUP_AUTOMOUNT;
if (flags & AT_EMPTY_PATH)
lookup_flags |= LOOKUP_EMPTY;
retry:
error = user_path_at(dfd, filename, lookup_flags, &path);
if (error)
@ -523,7 +533,7 @@ SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
}
#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
static noinline_for_stack int
noinline_for_stack int
cp_statx(const struct kstat *stat, struct statx __user *buffer)
{
struct statx tmp;