Contributors: 56
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Al Viro |
848 |
19.47% |
16 |
9.64% |
| Linus Torvalds (pre-git) |
641 |
14.72% |
35 |
21.08% |
| David Howells |
413 |
9.48% |
8 |
4.82% |
| Mateusz Guzik |
259 |
5.95% |
2 |
1.20% |
| Eric Biggers |
235 |
5.39% |
4 |
2.41% |
| Heiko Carstens |
216 |
4.96% |
5 |
3.01% |
| Christoph Hellwig |
212 |
4.87% |
8 |
4.82% |
| Andrew Morton |
124 |
2.85% |
6 |
3.61% |
| Jeff Layton |
107 |
2.46% |
6 |
3.61% |
| Stefan Roesch |
105 |
2.41% |
1 |
0.60% |
| Andi Kleen |
96 |
2.20% |
2 |
1.20% |
| Prasad Singamsetty |
95 |
2.18% |
2 |
1.20% |
| Stephen Rothwell |
94 |
2.16% |
3 |
1.81% |
| Ulrich Drepper |
86 |
1.97% |
2 |
1.20% |
| Jan Kara |
84 |
1.93% |
3 |
1.81% |
| Miklos Szeredi |
84 |
1.93% |
5 |
3.01% |
| Linus Torvalds |
68 |
1.56% |
9 |
5.42% |
| Christian Brauner |
48 |
1.10% |
6 |
3.61% |
| Eric W. Biedermann |
48 |
1.10% |
1 |
0.60% |
| Mikulas Patocka |
44 |
1.01% |
1 |
0.60% |
| Amir Goldstein |
41 |
0.94% |
1 |
0.60% |
| Dominik Brodowski |
38 |
0.87% |
1 |
0.60% |
| J. Bruce Fields |
38 |
0.87% |
1 |
0.60% |
| Arnaldo Carvalho de Melo |
38 |
0.87% |
1 |
0.60% |
| Bijan Mottahedeh |
36 |
0.83% |
2 |
1.20% |
| Chris Wedgwood |
28 |
0.64% |
1 |
0.60% |
| Stephen D. Smalley |
16 |
0.37% |
1 |
0.60% |
| Jan Blunck |
16 |
0.37% |
2 |
1.20% |
| Dmitriy Monakhov |
16 |
0.37% |
1 |
0.60% |
| Oleg Drokin |
16 |
0.37% |
1 |
0.60% |
| Theodore Y. Ts'o |
15 |
0.34% |
1 |
0.60% |
| Greg Kroah-Hartman |
15 |
0.34% |
4 |
2.41% |
| Stefan Berger |
15 |
0.34% |
1 |
0.60% |
| Tao Ma |
12 |
0.28% |
1 |
0.60% |
| Catalin Marinas |
11 |
0.25% |
1 |
0.60% |
| Andreas Schwab |
11 |
0.25% |
1 |
0.60% |
| Guo Ren |
10 |
0.23% |
1 |
0.60% |
| Darrick J. Wong |
8 |
0.18% |
1 |
0.60% |
| Kent Overstreet |
8 |
0.18% |
1 |
0.60% |
| Benjamin Marzinski |
7 |
0.16% |
1 |
0.60% |
| Jens Axboe |
6 |
0.14% |
1 |
0.60% |
| Ira Weiny |
6 |
0.14% |
1 |
0.60% |
| Mike Marshall |
6 |
0.14% |
1 |
0.60% |
| Arnd Bergmann |
5 |
0.11% |
1 |
0.60% |
| Alan Cox |
4 |
0.09% |
1 |
0.60% |
| Aneesh Kumar K.V |
4 |
0.09% |
1 |
0.60% |
| Kyle McMartin |
3 |
0.07% |
1 |
0.60% |
| Andy Whitcroft |
3 |
0.07% |
1 |
0.60% |
| Anton Blanchard |
3 |
0.07% |
1 |
0.60% |
| Ingo Molnar |
3 |
0.07% |
1 |
0.60% |
| Fabian Frederick |
3 |
0.07% |
1 |
0.60% |
| Andries E. Brouwer |
3 |
0.07% |
1 |
0.60% |
| David Mosberger-Tang |
2 |
0.05% |
1 |
0.60% |
| Alexander Mikhalitsyn |
1 |
0.02% |
1 |
0.60% |
| Paul Gortmaker |
1 |
0.02% |
1 |
0.60% |
| Arun Sharma |
1 |
0.02% |
1 |
0.60% |
| Total |
4356 |
|
166 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/stat.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <linux/blkdev.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/highuid.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/cred.h>
#include <linux/syscalls.h>
#include <linux/pagemap.h>
#include <linux/compat.h>
#include <linux/iversion.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
#include "internal.h"
#include "mount.h"
/**
* generic_fillattr - Fill in the basic attributes from the inode struct
* @idmap: idmap of the mount the inode was found from
* @request_mask: statx request_mask
* @inode: Inode to use as the source
* @stat: Where to fill in the attributes
*
* Fill in the basic attributes in the kstat structure from data that's to be
* found on the VFS inode structure. This is the default if no getattr inode
* operation is supplied.
*
* If the inode has been found through an idmapped mount the idmap of
* the vfsmount must be passed through @idmap. This function will then
* take care to map the inode according to @idmap before filling in the
* uid and gid filds. On non-idmapped mounts or if permission checking is to be
* performed on the raw inode simply pass @nop_mnt_idmap.
*/
void generic_fillattr(struct mnt_idmap *idmap, u32 request_mask,
struct inode *inode, struct kstat *stat)
{
vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
stat->dev = inode->i_sb->s_dev;
stat->ino = inode->i_ino;
stat->mode = inode->i_mode;
stat->nlink = inode->i_nlink;
stat->uid = vfsuid_into_kuid(vfsuid);
stat->gid = vfsgid_into_kgid(vfsgid);
stat->rdev = inode->i_rdev;
stat->size = i_size_read(inode);
stat->atime = inode_get_atime(inode);
stat->mtime = inode_get_mtime(inode);
stat->ctime = inode_get_ctime(inode);
stat->blksize = i_blocksize(inode);
stat->blocks = inode->i_blocks;
if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
stat->result_mask |= STATX_CHANGE_COOKIE;
stat->change_cookie = inode_query_iversion(inode);
}
}
EXPORT_SYMBOL(generic_fillattr);
/**
* generic_fill_statx_attr - Fill in the statx attributes from the inode flags
* @inode: Inode to use as the source
* @stat: Where to fill in the attribute flags
*
* Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
* inode that are published on i_flags and enforced by the VFS.
*/
void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
{
if (inode->i_flags & S_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (inode->i_flags & S_APPEND)
stat->attributes |= STATX_ATTR_APPEND;
stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS;
}
EXPORT_SYMBOL(generic_fill_statx_attr);
/**
* generic_fill_statx_atomic_writes - Fill in atomic writes statx attributes
* @stat: Where to fill in the attribute flags
* @unit_min: Minimum supported atomic write length in bytes
* @unit_max: Maximum supported atomic write length in bytes
*
* Fill in the STATX{_ATTR}_WRITE_ATOMIC flags in the kstat structure from
* atomic write unit_min and unit_max values.
*/
void generic_fill_statx_atomic_writes(struct kstat *stat,
unsigned int unit_min,
unsigned int unit_max)
{
/* Confirm that the request type is known */
stat->result_mask |= STATX_WRITE_ATOMIC;
/* Confirm that the file attribute type is known */
stat->attributes_mask |= STATX_ATTR_WRITE_ATOMIC;
if (unit_min) {
stat->atomic_write_unit_min = unit_min;
stat->atomic_write_unit_max = unit_max;
/* Initially only allow 1x segment */
stat->atomic_write_segments_max = 1;
/* Confirm atomic writes are actually supported */
stat->attributes |= STATX_ATTR_WRITE_ATOMIC;
}
}
EXPORT_SYMBOL_GPL(generic_fill_statx_atomic_writes);
/**
* vfs_getattr_nosec - getattr without security checks
* @path: file to get attributes from
* @stat: structure to return attributes in
* @request_mask: STATX_xxx flags indicating what the caller wants
* @query_flags: Query mode (AT_STATX_SYNC_TYPE)
*
* Get attributes without calling security_inode_getattr.
*
* Currently the only caller other than vfs_getattr is internal to the
* filehandle lookup code, which uses only the inode number and returns no
* attributes to any user. Any other code probably wants vfs_getattr.
*/
int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
struct mnt_idmap *idmap;
struct inode *inode = d_backing_inode(path->dentry);
memset(stat, 0, sizeof(*stat));
stat->result_mask |= STATX_BASIC_STATS;
query_flags &= AT_STATX_SYNC_TYPE;
/* allow the fs to override these if it really wants to */
/* SB_NOATIME means filesystem supplies dummy atime value */
if (inode->i_sb->s_flags & SB_NOATIME)
stat->result_mask &= ~STATX_ATIME;
/*
* Note: If you add another clause to set an attribute flag, please
* update attributes_mask below.
*/
if (IS_AUTOMOUNT(inode))
stat->attributes |= STATX_ATTR_AUTOMOUNT;
if (IS_DAX(inode))
stat->attributes |= STATX_ATTR_DAX;
stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
STATX_ATTR_DAX);
idmap = mnt_idmap(path->mnt);
if (inode->i_op->getattr)
return inode->i_op->getattr(idmap, path, stat,
request_mask,
query_flags | AT_GETATTR_NOSEC);
generic_fillattr(idmap, request_mask, inode, stat);
return 0;
}
EXPORT_SYMBOL(vfs_getattr_nosec);
/*
* vfs_getattr - Get the enhanced basic attributes of a file
* @path: The file of interest
* @stat: Where to return the statistics
* @request_mask: STATX_xxx flags indicating what the caller wants
* @query_flags: Query mode (AT_STATX_SYNC_TYPE)
*
* Ask the filesystem for a file's attributes. The caller must indicate in
* request_mask and query_flags to indicate what they want.
*
* If the file is remote, the filesystem can be forced to update the attributes
* from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
* suppress the update by passing AT_STATX_DONT_SYNC.
*
* Bits must have been set in request_mask to indicate which attributes the
* caller wants retrieving. Any such attribute not requested may be returned
* anyway, but the value may be approximate, and, if remote, may not have been
* synchronised with the server.
*
* 0 will be returned on success, and a -ve error code if unsuccessful.
*/
int vfs_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
int retval;
if (WARN_ON_ONCE(query_flags & AT_GETATTR_NOSEC))
return -EPERM;
retval = security_inode_getattr(path);
if (retval)
return retval;
return vfs_getattr_nosec(path, stat, request_mask, query_flags);
}
EXPORT_SYMBOL(vfs_getattr);
/**
* vfs_fstat - Get the basic attributes by file descriptor
* @fd: The file descriptor referring to the file of interest
* @stat: The result structure to fill in.
*
* This function is a wrapper around vfs_getattr(). The main difference is
* that it uses a file descriptor to determine the file location.
*
* 0 will be returned on success, and a -ve error code if unsuccessful.
*/
int vfs_fstat(int fd, struct kstat *stat)
{
struct fd f;
int error;
f = fdget_raw(fd);
if (!f.file)
return -EBADF;
error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0);
fdput(f);
return error;
}
int getname_statx_lookup_flags(int flags)
{
int lookup_flags = 0;
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 lookup_flags;
}
static int vfs_statx_path(struct path *path, int flags, struct kstat *stat,
u32 request_mask)
{
int error = vfs_getattr(path, stat, request_mask, flags);
if (request_mask & STATX_MNT_ID_UNIQUE) {
stat->mnt_id = real_mount(path->mnt)->mnt_id_unique;
stat->result_mask |= STATX_MNT_ID_UNIQUE;
} else {
stat->mnt_id = real_mount(path->mnt)->mnt_id;
stat->result_mask |= STATX_MNT_ID;
}
if (path_mounted(path))
stat->attributes |= STATX_ATTR_MOUNT_ROOT;
stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
/*
* If this is a block device inode, override the filesystem
* attributes with the block device specific parameters that need to be
* obtained from the bdev backing inode.
*/
if (S_ISBLK(stat->mode))
bdev_statx(path, stat, request_mask);
return error;
}
static int vfs_statx_fd(int fd, int flags, struct kstat *stat,
u32 request_mask)
{
CLASS(fd_raw, f)(fd);
if (!f.file)
return -EBADF;
return vfs_statx_path(&f.file->f_path, flags, stat, request_mask);
}
/**
* vfs_statx - Get basic and extra attributes by filename
* @dfd: A file descriptor representing the base dir for a relative filename
* @filename: The name of the file of interest
* @flags: Flags to control the query
* @stat: The result structure to fill in.
* @request_mask: STATX_xxx flags indicating what the caller wants
*
* This function is a wrapper around vfs_getattr(). The main difference is
* that it uses a filename and base directory to determine the file location.
* Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
* at the given name from being referenced.
*
* 0 will be returned on success, and a -ve error code if unsuccessful.
*/
static int vfs_statx(int dfd, struct filename *filename, int flags,
struct kstat *stat, u32 request_mask)
{
struct path path;
unsigned int lookup_flags = getname_statx_lookup_flags(flags);
int error;
if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH |
AT_STATX_SYNC_TYPE))
return -EINVAL;
retry:
error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
if (error)
return error;
error = vfs_statx_path(&path, flags, stat, request_mask);
path_put(&path);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
return error;
}
int vfs_fstatat(int dfd, const char __user *filename,
struct kstat *stat, int flags)
{
int ret;
int statx_flags = flags | AT_NO_AUTOMOUNT;
struct filename *name;
/*
* Work around glibc turning fstat() into fstatat(AT_EMPTY_PATH)
*
* If AT_EMPTY_PATH is set, we expect the common case to be that
* empty path, and avoid doing all the extra pathname work.
*/
if (flags == AT_EMPTY_PATH && vfs_empty_path(dfd, filename))
return vfs_fstat(dfd, stat);
name = getname_flags(filename, getname_statx_lookup_flags(statx_flags));
ret = vfs_statx(dfd, name, statx_flags, stat, STATX_BASIC_STATS);
putname(name);
return ret;
}
#ifdef __ARCH_WANT_OLD_STAT
/*
* For backward compatibility? Maybe this should be moved
* into arch/i386 instead?
*/
static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
{
static int warncount = 5;
struct __old_kernel_stat tmp;
if (warncount > 0) {
warncount--;
printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
current->comm);
} else if (warncount < 0) {
/* it's laughable, but... */
warncount = 0;
}
memset(&tmp, 0, sizeof(struct __old_kernel_stat));
tmp.st_dev = old_encode_dev(stat->dev);
tmp.st_ino = stat->ino;
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
return -EOVERFLOW;
tmp.st_mode = stat->mode;
tmp.st_nlink = stat->nlink;
if (tmp.st_nlink != stat->nlink)
return -EOVERFLOW;
SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
tmp.st_rdev = old_encode_dev(stat->rdev);
#if BITS_PER_LONG == 32
if (stat->size > MAX_NON_LFS)
return -EOVERFLOW;
#endif
tmp.st_size = stat->size;
tmp.st_atime = stat->atime.tv_sec;
tmp.st_mtime = stat->mtime.tv_sec;
tmp.st_ctime = stat->ctime.tv_sec;
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}
SYSCALL_DEFINE2(stat, const char __user *, filename,
struct __old_kernel_stat __user *, statbuf)
{
struct kstat stat;
int error;
error = vfs_stat(filename, &stat);
if (error)
return error;
return cp_old_stat(&stat, statbuf);
}
SYSCALL_DEFINE2(lstat, const char __user *, filename,
struct __old_kernel_stat __user *, statbuf)
{
struct kstat stat;
int error;
error = vfs_lstat(filename, &stat);
if (error)
return error;
return cp_old_stat(&stat, statbuf);
}
SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
{
struct kstat stat;
int error = vfs_fstat(fd, &stat);
if (!error)
error = cp_old_stat(&stat, statbuf);
return error;
}
#endif /* __ARCH_WANT_OLD_STAT */
#ifdef __ARCH_WANT_NEW_STAT
#ifndef INIT_STRUCT_STAT_PADDING
# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
#endif
static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
{
struct stat tmp;
if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
return -EOVERFLOW;
if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
return -EOVERFLOW;
#if BITS_PER_LONG == 32
if (stat->size > MAX_NON_LFS)
return -EOVERFLOW;
#endif
INIT_STRUCT_STAT_PADDING(tmp);
tmp.st_dev = new_encode_dev(stat->dev);
tmp.st_ino = stat->ino;
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
return -EOVERFLOW;
tmp.st_mode = stat->mode;
tmp.st_nlink = stat->nlink;
if (tmp.st_nlink != stat->nlink)
return -EOVERFLOW;
SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
tmp.st_rdev = new_encode_dev(stat->rdev);
tmp.st_size = stat->size;
tmp.st_atime = stat->atime.tv_sec;
tmp.st_mtime = stat->mtime.tv_sec;
tmp.st_ctime = stat->ctime.tv_sec;
#ifdef STAT_HAVE_NSEC
tmp.st_atime_nsec = stat->atime.tv_nsec;
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
#endif
tmp.st_blocks = stat->blocks;
tmp.st_blksize = stat->blksize;
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}
SYSCALL_DEFINE2(newstat, const char __user *, filename,
struct stat __user *, statbuf)
{
struct kstat stat;
int error = vfs_stat(filename, &stat);
if (error)
return error;
return cp_new_stat(&stat, statbuf);
}
SYSCALL_DEFINE2(newlstat, const char __user *, filename,
struct stat __user *, statbuf)
{
struct kstat stat;
int error;
error = vfs_lstat(filename, &stat);
if (error)
return error;
return cp_new_stat(&stat, statbuf);
}
#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
struct stat __user *, statbuf, int, flag)
{
struct kstat stat;
int error;
error = vfs_fstatat(dfd, filename, &stat, flag);
if (error)
return error;
return cp_new_stat(&stat, statbuf);
}
#endif
SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
{
struct kstat stat;
int error = vfs_fstat(fd, &stat);
if (!error)
error = cp_new_stat(&stat, statbuf);
return error;
}
#endif
static int do_readlinkat(int dfd, const char __user *pathname,
char __user *buf, int bufsiz)
{
struct path path;
struct filename *name;
int error;
unsigned int lookup_flags = LOOKUP_EMPTY;
if (bufsiz <= 0)
return -EINVAL;
retry:
name = getname_flags(pathname, lookup_flags);
error = filename_lookup(dfd, name, lookup_flags, &path, NULL);
if (unlikely(error)) {
putname(name);
return error;
}
/*
* AFS mountpoints allow readlink(2) but are not symlinks
*/
if (d_is_symlink(path.dentry) ||
d_backing_inode(path.dentry)->i_op->readlink) {
error = security_inode_readlink(path.dentry);
if (!error) {
touch_atime(&path);
error = vfs_readlink(path.dentry, buf, bufsiz);
}
} else {
error = (name->name[0] == '\0') ? -ENOENT : -EINVAL;
}
path_put(&path);
putname(name);
if (retry_estale(error, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
return error;
}
SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
char __user *, buf, int, bufsiz)
{
return do_readlinkat(dfd, pathname, buf, bufsiz);
}
SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
int, bufsiz)
{
return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
}
/* ---------- LFS-64 ----------- */
#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
#ifndef INIT_STRUCT_STAT64_PADDING
# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
#endif
static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
{
struct stat64 tmp;
INIT_STRUCT_STAT64_PADDING(tmp);
#ifdef CONFIG_MIPS
/* mips has weird padding, so we don't get 64 bits there */
tmp.st_dev = new_encode_dev(stat->dev);
tmp.st_rdev = new_encode_dev(stat->rdev);
#else
tmp.st_dev = huge_encode_dev(stat->dev);
tmp.st_rdev = huge_encode_dev(stat->rdev);
#endif
tmp.st_ino = stat->ino;
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
return -EOVERFLOW;
#ifdef STAT64_HAS_BROKEN_ST_INO
tmp.__st_ino = stat->ino;
#endif
tmp.st_mode = stat->mode;
tmp.st_nlink = stat->nlink;
tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
tmp.st_atime = stat->atime.tv_sec;
tmp.st_atime_nsec = stat->atime.tv_nsec;
tmp.st_mtime = stat->mtime.tv_sec;
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
tmp.st_ctime = stat->ctime.tv_sec;
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
tmp.st_size = stat->size;
tmp.st_blocks = stat->blocks;
tmp.st_blksize = stat->blksize;
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}
SYSCALL_DEFINE2(stat64, const char __user *, filename,
struct stat64 __user *, statbuf)
{
struct kstat stat;
int error = vfs_stat(filename, &stat);
if (!error)
error = cp_new_stat64(&stat, statbuf);
return error;
}
SYSCALL_DEFINE2(lstat64, const char __user *, filename,
struct stat64 __user *, statbuf)
{
struct kstat stat;
int error = vfs_lstat(filename, &stat);
if (!error)
error = cp_new_stat64(&stat, statbuf);
return error;
}
SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
{
struct kstat stat;
int error = vfs_fstat(fd, &stat);
if (!error)
error = cp_new_stat64(&stat, statbuf);
return error;
}
SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
struct stat64 __user *, statbuf, int, flag)
{
struct kstat stat;
int error;
error = vfs_fstatat(dfd, filename, &stat, flag);
if (error)
return error;
return cp_new_stat64(&stat, statbuf);
}
#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
static noinline_for_stack int
cp_statx(const struct kstat *stat, struct statx __user *buffer)
{
struct statx tmp;
memset(&tmp, 0, sizeof(tmp));
/* STATX_CHANGE_COOKIE is kernel-only for now */
tmp.stx_mask = stat->result_mask & ~STATX_CHANGE_COOKIE;
tmp.stx_blksize = stat->blksize;
/* STATX_ATTR_CHANGE_MONOTONIC is kernel-only for now */
tmp.stx_attributes = stat->attributes & ~STATX_ATTR_CHANGE_MONOTONIC;
tmp.stx_nlink = stat->nlink;
tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
tmp.stx_mode = stat->mode;
tmp.stx_ino = stat->ino;
tmp.stx_size = stat->size;
tmp.stx_blocks = stat->blocks;
tmp.stx_attributes_mask = stat->attributes_mask;
tmp.stx_atime.tv_sec = stat->atime.tv_sec;
tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
tmp.stx_btime.tv_sec = stat->btime.tv_sec;
tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
tmp.stx_rdev_major = MAJOR(stat->rdev);
tmp.stx_rdev_minor = MINOR(stat->rdev);
tmp.stx_dev_major = MAJOR(stat->dev);
tmp.stx_dev_minor = MINOR(stat->dev);
tmp.stx_mnt_id = stat->mnt_id;
tmp.stx_dio_mem_align = stat->dio_mem_align;
tmp.stx_dio_offset_align = stat->dio_offset_align;
tmp.stx_subvol = stat->subvol;
tmp.stx_atomic_write_unit_min = stat->atomic_write_unit_min;
tmp.stx_atomic_write_unit_max = stat->atomic_write_unit_max;
tmp.stx_atomic_write_segments_max = stat->atomic_write_segments_max;
return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
int do_statx(int dfd, struct filename *filename, unsigned int 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;
/*
* STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
* from userland.
*/
mask &= ~STATX_CHANGE_COOKIE;
error = vfs_statx(dfd, filename, flags, &stat, mask);
if (error)
return error;
return cp_statx(&stat, buffer);
}
int do_statx_fd(int fd, unsigned int 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;
/*
* STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
* from userland.
*/
mask &= ~STATX_CHANGE_COOKIE;
error = vfs_statx_fd(fd, 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.
* @filename: File to stat or either NULL or "" with AT_EMPTY_PATH
* @flags: AT_* flags to control pathwalk.
* @mask: Parts of statx struct actually required.
* @buffer: Result buffer.
*
* Note that fstat() can be emulated by setting dfd to the fd of interest,
* supplying "" (or preferably NULL) as the filename and setting AT_EMPTY_PATH
* in the flags.
*/
SYSCALL_DEFINE5(statx,
int, dfd, const char __user *, filename, unsigned, flags,
unsigned int, mask,
struct statx __user *, buffer)
{
int ret;
unsigned lflags;
struct filename *name;
/*
* Short-circuit handling of NULL and "" paths.
*
* For a NULL path we require and accept only the AT_EMPTY_PATH flag
* (possibly |'d with AT_STATX flags).
*
* However, glibc on 32-bit architectures implements fstatat as statx
* with the "" pathname and AT_NO_AUTOMOUNT | AT_EMPTY_PATH flags.
* Supporting this results in the uglification below.
*/
lflags = flags & ~(AT_NO_AUTOMOUNT | AT_STATX_SYNC_TYPE);
if (lflags == AT_EMPTY_PATH && vfs_empty_path(dfd, filename))
return do_statx_fd(dfd, flags & ~AT_NO_AUTOMOUNT, mask, buffer);
name = getname_flags(filename, getname_statx_lookup_flags(flags));
ret = do_statx(dfd, name, flags, mask, buffer);
putname(name);
return ret;
}
#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT)
static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
{
struct compat_stat tmp;
if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
return -EOVERFLOW;
if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
return -EOVERFLOW;
memset(&tmp, 0, sizeof(tmp));
tmp.st_dev = new_encode_dev(stat->dev);
tmp.st_ino = stat->ino;
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
return -EOVERFLOW;
tmp.st_mode = stat->mode;
tmp.st_nlink = stat->nlink;
if (tmp.st_nlink != stat->nlink)
return -EOVERFLOW;
SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
tmp.st_rdev = new_encode_dev(stat->rdev);
if ((u64) stat->size > MAX_NON_LFS)
return -EOVERFLOW;
tmp.st_size = stat->size;
tmp.st_atime = stat->atime.tv_sec;
tmp.st_atime_nsec = stat->atime.tv_nsec;
tmp.st_mtime = stat->mtime.tv_sec;
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
tmp.st_ctime = stat->ctime.tv_sec;
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
tmp.st_blocks = stat->blocks;
tmp.st_blksize = stat->blksize;
return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
struct compat_stat __user *, statbuf)
{
struct kstat stat;
int error;
error = vfs_stat(filename, &stat);
if (error)
return error;
return cp_compat_stat(&stat, statbuf);
}
COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
struct compat_stat __user *, statbuf)
{
struct kstat stat;
int error;
error = vfs_lstat(filename, &stat);
if (error)
return error;
return cp_compat_stat(&stat, statbuf);
}
#ifndef __ARCH_WANT_STAT64
COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
const char __user *, filename,
struct compat_stat __user *, statbuf, int, flag)
{
struct kstat stat;
int error;
error = vfs_fstatat(dfd, filename, &stat, flag);
if (error)
return error;
return cp_compat_stat(&stat, statbuf);
}
#endif
COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
struct compat_stat __user *, statbuf)
{
struct kstat stat;
int error = vfs_fstat(fd, &stat);
if (!error)
error = cp_compat_stat(&stat, statbuf);
return error;
}
#endif
/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
void __inode_add_bytes(struct inode *inode, loff_t bytes)
{
inode->i_blocks += bytes >> 9;
bytes &= 511;
inode->i_bytes += bytes;
if (inode->i_bytes >= 512) {
inode->i_blocks++;
inode->i_bytes -= 512;
}
}
EXPORT_SYMBOL(__inode_add_bytes);
void inode_add_bytes(struct inode *inode, loff_t bytes)
{
spin_lock(&inode->i_lock);
__inode_add_bytes(inode, bytes);
spin_unlock(&inode->i_lock);
}
EXPORT_SYMBOL(inode_add_bytes);
void __inode_sub_bytes(struct inode *inode, loff_t bytes)
{
inode->i_blocks -= bytes >> 9;
bytes &= 511;
if (inode->i_bytes < bytes) {
inode->i_blocks--;
inode->i_bytes += 512;
}
inode->i_bytes -= bytes;
}
EXPORT_SYMBOL(__inode_sub_bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes)
{
spin_lock(&inode->i_lock);
__inode_sub_bytes(inode, bytes);
spin_unlock(&inode->i_lock);
}
EXPORT_SYMBOL(inode_sub_bytes);
loff_t inode_get_bytes(struct inode *inode)
{
loff_t ret;
spin_lock(&inode->i_lock);
ret = __inode_get_bytes(inode);
spin_unlock(&inode->i_lock);
return ret;
}
EXPORT_SYMBOL(inode_get_bytes);
void inode_set_bytes(struct inode *inode, loff_t bytes)
{
/* Caller is here responsible for sufficient locking
* (ie. inode->i_lock) */
inode->i_blocks = bytes >> 9;
inode->i_bytes = bytes & 511;
}
EXPORT_SYMBOL(inode_set_bytes);