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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse Source 
Pull VFS fixes from Al Viro:
 "statx followup fixes and a fix for stack-smashing on alpha"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  alpha: fix stack smashing in old_adjtimex(2)
  statx: Include a mask for stx_attributes in struct statx
  statx: Reserve the top bit of the mask for future struct expansion
  xfs: report crtime and attribute flags to statx
  ext4: Add statx support
  statx: optimize copy of struct statx to userspace
  statx: remove incorrect part of vfs_statx() comment
  statx: reject unknown flags when using NULL path
  Documentation/filesystems: fix documentation for ->getattr()
This commit is contained in:
Linus Torvalds 2017-04-09 08:26:21 -07:00
commit 2a610b8aa8
14 changed files with 117 additions and 58 deletions
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3
Documentation/filesystems/Locking
View File

@ -58,8 +58,7 @@ prototypes:
int (*permission) (struct inode *, int, unsigned int);
int (*get_acl)(struct inode *, int);
int (*setattr) (struct dentry *, struct iattr *);
int (*getattr) (const struct path *, struct dentry *, struct kstat *,
u32, unsigned int);
int (*getattr) (const struct path *, struct kstat *, u32, unsigned int);
ssize_t (*listxattr) (struct dentry *, char *, size_t);
int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, u64 len);
void (*update_time)(struct inode *, struct timespec *, int);

6
Documentation/filesystems/porting
View File

@ -600,3 +600,9 @@ in your dentry operations instead.
[recommended]
->readlink is optional for symlinks. Don't set, unless filesystem needs
to fake something for readlink(2).
--
[mandatory]
->getattr() is now passed a struct path rather than a vfsmount and
dentry separately, and it now has request_mask and query_flags arguments
to specify the fields and sync type requested by statx. Filesystems not
supporting any statx-specific features may ignore the new arguments.

3
Documentation/filesystems/vfs.txt
View File

@ -382,8 +382,7 @@ struct inode_operations {
int (*permission) (struct inode *, int);
int (*get_acl)(struct inode *, int);
int (*setattr) (struct dentry *, struct iattr *);
int (*getattr) (const struct path *, struct dentry *, struct kstat *,
u32, unsigned int);
int (*getattr) (const struct path *, struct kstat *, u32, unsigned int);
ssize_t (*listxattr) (struct dentry *, char *, size_t);
void (*update_time)(struct inode *, struct timespec *, int);
int (*atomic_open)(struct inode *, struct dentry *, struct file *,

2
arch/alpha/kernel/osf_sys.c
View File

@ -1290,7 +1290,7 @@ SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p)
/* copy relevant bits of struct timex. */
if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) -
offsetof(struct timex32, time)))
offsetof(struct timex32, tick)))
return -EFAULT;
ret = do_adjtimex(&txc);

1
fs/ext4/ext4.h
View File

@ -2466,6 +2466,7 @@ extern int ext4_setattr(struct dentry *, struct iattr *);
extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
extern void ext4_evict_inode(struct inode *);
extern void ext4_clear_inode(struct inode *);
extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
extern int ext4_sync_inode(handle_t *, struct inode *);
extern void ext4_dirty_inode(struct inode *, int);
extern int ext4_change_inode_journal_flag(struct inode *, int);

2
fs/ext4/file.c
View File

@ -744,7 +744,7 @@ const struct file_operations ext4_file_operations = {
const struct inode_operations ext4_file_inode_operations = {
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.getattr = ext4_file_getattr,
.listxattr = ext4_listxattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,

41
fs/ext4/inode.c
View File

@ -5390,11 +5390,46 @@ err_out:
int ext4_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
struct inode *inode;
unsigned long long delalloc_blocks;
struct inode *inode = d_inode(path->dentry);
struct ext4_inode *raw_inode;
struct ext4_inode_info *ei = EXT4_I(inode);
unsigned int flags;
if (EXT4_FITS_IN_INODE(raw_inode, ei, i_crtime)) {
stat->result_mask |= STATX_BTIME;
stat->btime.tv_sec = ei->i_crtime.tv_sec;
stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
}
flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
if (flags & EXT4_APPEND_FL)
stat->attributes |= STATX_ATTR_APPEND;
if (flags & EXT4_COMPR_FL)
stat->attributes |= STATX_ATTR_COMPRESSED;
if (flags & EXT4_ENCRYPT_FL)
stat->attributes |= STATX_ATTR_ENCRYPTED;
if (flags & EXT4_IMMUTABLE_FL)
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (flags & EXT4_NODUMP_FL)
stat->attributes |= STATX_ATTR_NODUMP;
stat->attributes_mask |= (STATX_ATTR_APPEND |
STATX_ATTR_COMPRESSED |
STATX_ATTR_ENCRYPTED |
STATX_ATTR_IMMUTABLE |
STATX_ATTR_NODUMP);
inode = d_inode(path->dentry);
generic_fillattr(inode, stat);
return 0;
}
int ext4_file_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
struct inode *inode = d_inode(path->dentry);
u64 delalloc_blocks;
ext4_getattr(path, stat, request_mask, query_flags);
/*
* If there is inline data in the inode, the inode will normally not

2
fs/ext4/namei.c
View File

@ -3912,6 +3912,7 @@ const struct inode_operations ext4_dir_inode_operations = {
.tmpfile = ext4_tmpfile,
.rename = ext4_rename2,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.listxattr = ext4_listxattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
@ -3920,6 +3921,7 @@ const struct inode_operations ext4_dir_inode_operations = {
const struct inode_operations ext4_special_inode_operations = {
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.listxattr = ext4_listxattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,

3
fs/ext4/symlink.c
View File

@ -85,17 +85,20 @@ errout:
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.listxattr = ext4_listxattr,
};
const struct inode_operations ext4_symlink_inode_operations = {
.get_link = page_get_link,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.listxattr = ext4_listxattr,
};
const struct inode_operations ext4_fast_symlink_inode_operations = {
.get_link = simple_get_link,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.listxattr = ext4_listxattr,
};

80
fs/stat.c
View File

@ -130,9 +130,13 @@ EXPORT_SYMBOL(vfs_getattr);
int vfs_statx_fd(unsigned int fd, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
struct fd f = fdget_raw(fd);
struct fd f;
int error = -EBADF;
if (query_flags & ~KSTAT_QUERY_FLAGS)
return -EINVAL;
f = fdget_raw(fd);
if (f.file) {
error = vfs_getattr(&f.file->f_path, stat,
request_mask, query_flags);
@ -155,9 +159,6 @@ EXPORT_SYMBOL(vfs_statx_fd);
* Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
* at the given name from being referenced.
*
* The caller must have preset stat->request_mask as for vfs_getattr(). The
* flags are also used to load up stat->query_flags.
*
* 0 will be returned on success, and a -ve error code if unsuccessful.
*/
int vfs_statx(int dfd, const char __user *filename, int flags,
@ -509,46 +510,38 @@ SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
}
#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
static inline int __put_timestamp(struct timespec *kts,
struct statx_timestamp __user *uts)
static noinline_for_stack int
cp_statx(const struct kstat *stat, struct statx __user *buffer)
{
return (__put_user(kts->tv_sec, &uts->tv_sec ) ||
__put_user(kts->tv_nsec, &uts->tv_nsec ) ||
__put_user(0, &uts->__reserved ));
}
struct statx tmp;
/*
* Set the statx results.
*/
static long statx_set_result(struct kstat *stat, struct statx __user *buffer)
{
uid_t uid = from_kuid_munged(current_user_ns(), stat->uid);
gid_t gid = from_kgid_munged(current_user_ns(), stat->gid);
memset(&tmp, 0, sizeof(tmp));
if (__put_user(stat->result_mask, &buffer->stx_mask ) ||
__put_user(stat->mode, &buffer->stx_mode ) ||
__clear_user(&buffer->__spare0, sizeof(buffer->__spare0)) ||
__put_user(stat->nlink, &buffer->stx_nlink ) ||
__put_user(uid, &buffer->stx_uid ) ||
__put_user(gid, &buffer->stx_gid ) ||
__put_user(stat->attributes, &buffer->stx_attributes ) ||
__put_user(stat->blksize, &buffer->stx_blksize ) ||
__put_user(MAJOR(stat->rdev), &buffer->stx_rdev_major ) ||
__put_user(MINOR(stat->rdev), &buffer->stx_rdev_minor ) ||
__put_user(MAJOR(stat->dev), &buffer->stx_dev_major ) ||
__put_user(MINOR(stat->dev), &buffer->stx_dev_minor ) ||
__put_timestamp(&stat->atime, &buffer->stx_atime ) ||
__put_timestamp(&stat->btime, &buffer->stx_btime ) ||
__put_timestamp(&stat->ctime, &buffer->stx_ctime ) ||
__put_timestamp(&stat->mtime, &buffer->stx_mtime ) ||
__put_user(stat->ino, &buffer->stx_ino ) ||
__put_user(stat->size, &buffer->stx_size ) ||
__put_user(stat->blocks, &buffer->stx_blocks ) ||
__clear_user(&buffer->__spare1, sizeof(buffer->__spare1)) ||
__clear_user(&buffer->__spare2, sizeof(buffer->__spare2)))
return -EFAULT;
tmp.stx_mask = stat->result_mask;
tmp.stx_blksize = stat->blksize;
tmp.stx_attributes = stat->attributes;
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);
return 0;
return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
/**
@ -570,10 +563,10 @@ SYSCALL_DEFINE5(statx,
struct kstat stat;
int error;
if (mask & STATX__RESERVED)
return -EINVAL;
if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
return -EINVAL;
if (!access_ok(VERIFY_WRITE, buffer, sizeof(*buffer)))
return -EFAULT;
if (filename)
error = vfs_statx(dfd, filename, flags, &stat, mask);
@ -581,7 +574,8 @@ SYSCALL_DEFINE5(statx,
error = vfs_statx_fd(dfd, &stat, mask, flags);
if (error)
return error;
return statx_set_result(&stat, buffer);
return cp_statx(&stat, buffer);
}
/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */

14
fs/xfs/xfs_iops.c
View File

@ -516,6 +516,20 @@ xfs_vn_getattr(
stat->blocks =
XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
if (ip->i_d.di_version == 3) {
if (request_mask & STATX_BTIME) {
stat->result_mask |= STATX_BTIME;
stat->btime.tv_sec = ip->i_d.di_crtime.t_sec;
stat->btime.tv_nsec = ip->i_d.di_crtime.t_nsec;
}
}
if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
stat->attributes |= STATX_ATTR_APPEND;
if (ip->i_d.di_flags & XFS_DIFLAG_NODUMP)
stat->attributes |= STATX_ATTR_NODUMP;
switch (inode->i_mode & S_IFMT) {
case S_IFBLK:

1
include/linux/stat.h
View File

@ -26,6 +26,7 @@ struct kstat {
unsigned int nlink;
uint32_t blksize; /* Preferred I/O size */
u64 attributes;
u64 attributes_mask;
#define KSTAT_ATTR_FS_IOC_FLAGS \
(STATX_ATTR_COMPRESSED | \
STATX_ATTR_IMMUTABLE | \

5
include/uapi/linux/stat.h
View File

@ -114,7 +114,7 @@ struct statx {
__u64 stx_ino; /* Inode number */
__u64 stx_size; /* File size */
__u64 stx_blocks; /* Number of 512-byte blocks allocated */
__u64 __spare1[1];
__u64 stx_attributes_mask; /* Mask to show what's supported in stx_attributes */
/* 0x40 */
struct statx_timestamp stx_atime; /* Last access time */
struct statx_timestamp stx_btime; /* File creation time */
@ -152,9 +152,10 @@ struct statx {
#define STATX_BASIC_STATS 0x000007ffU /* The stuff in the normal stat struct */
#define STATX_BTIME 0x00000800U /* Want/got stx_btime */
#define STATX_ALL 0x00000fffU /* All currently supported flags */
#define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */
/*
* Attributes to be found in stx_attributes
* Attributes to be found in stx_attributes and masked in stx_attributes_mask.
*
* These give information about the features or the state of a file that might
* be of use to ordinary userspace programs such as GUIs or ls rather than

12
samples/statx/test-statx.c
View File

@ -141,8 +141,8 @@ static void dump_statx(struct statx *stx)
if (stx->stx_mask & STATX_BTIME)
print_time(" Birth: ", &stx->stx_btime);
if (stx->stx_attributes) {
unsigned char bits;
if (stx->stx_attributes_mask) {
unsigned char bits, mbits;
int loop, byte;
static char attr_representation[64 + 1] =
@ -160,14 +160,18 @@ static void dump_statx(struct statx *stx)
printf("Attributes: %016llx (", stx->stx_attributes);
for (byte = 64 - 8; byte >= 0; byte -= 8) {
bits = stx->stx_attributes >> byte;
mbits = stx->stx_attributes_mask >> byte;
for (loop = 7; loop >= 0; loop--) {
int bit = byte + loop;
if (bits & 0x80)
if (!(mbits & 0x80))
putchar('.'); /* Not supported */
else if (bits & 0x80)
putchar(attr_representation[63 - bit]);
else
putchar('-');
putchar('-'); /* Not set */
bits <<= 1;
mbits <<= 1;
}
if (byte)
putchar(' ');