mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
853 lines
21 KiB
853 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* linux/fs/ioctl.c |
|
* |
|
* Copyright (C) 1991, 1992 Linus Torvalds |
|
*/ |
|
|
|
#include <linux/syscalls.h> |
|
#include <linux/mm.h> |
|
#include <linux/capability.h> |
|
#include <linux/compat.h> |
|
#include <linux/file.h> |
|
#include <linux/fs.h> |
|
#include <linux/security.h> |
|
#include <linux/export.h> |
|
#include <linux/uaccess.h> |
|
#include <linux/writeback.h> |
|
#include <linux/buffer_head.h> |
|
#include <linux/falloc.h> |
|
#include <linux/sched/signal.h> |
|
#include <linux/fiemap.h> |
|
|
|
#include "internal.h" |
|
|
|
#include <asm/ioctls.h> |
|
|
|
/* So that the fiemap access checks can't overflow on 32 bit machines. */ |
|
#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) |
|
|
|
/** |
|
* vfs_ioctl - call filesystem specific ioctl methods |
|
* @filp: open file to invoke ioctl method on |
|
* @cmd: ioctl command to execute |
|
* @arg: command-specific argument for ioctl |
|
* |
|
* Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise |
|
* returns -ENOTTY. |
|
* |
|
* Returns 0 on success, -errno on error. |
|
*/ |
|
long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
|
{ |
|
int error = -ENOTTY; |
|
|
|
if (!filp->f_op->unlocked_ioctl) |
|
goto out; |
|
|
|
error = filp->f_op->unlocked_ioctl(filp, cmd, arg); |
|
if (error == -ENOIOCTLCMD) |
|
error = -ENOTTY; |
|
out: |
|
return error; |
|
} |
|
EXPORT_SYMBOL(vfs_ioctl); |
|
|
|
static int ioctl_fibmap(struct file *filp, int __user *p) |
|
{ |
|
struct inode *inode = file_inode(filp); |
|
struct super_block *sb = inode->i_sb; |
|
int error, ur_block; |
|
sector_t block; |
|
|
|
if (!capable(CAP_SYS_RAWIO)) |
|
return -EPERM; |
|
|
|
error = get_user(ur_block, p); |
|
if (error) |
|
return error; |
|
|
|
if (ur_block < 0) |
|
return -EINVAL; |
|
|
|
block = ur_block; |
|
error = bmap(inode, &block); |
|
|
|
if (block > INT_MAX) { |
|
error = -ERANGE; |
|
pr_warn_ratelimited("[%s/%d] FS: %s File: %pD4 would truncate fibmap result\n", |
|
current->comm, task_pid_nr(current), |
|
sb->s_id, filp); |
|
} |
|
|
|
if (error) |
|
ur_block = 0; |
|
else |
|
ur_block = block; |
|
|
|
if (put_user(ur_block, p)) |
|
error = -EFAULT; |
|
|
|
return error; |
|
} |
|
|
|
/** |
|
* fiemap_fill_next_extent - Fiemap helper function |
|
* @fieinfo: Fiemap context passed into ->fiemap |
|
* @logical: Extent logical start offset, in bytes |
|
* @phys: Extent physical start offset, in bytes |
|
* @len: Extent length, in bytes |
|
* @flags: FIEMAP_EXTENT flags that describe this extent |
|
* |
|
* Called from file system ->fiemap callback. Will populate extent |
|
* info as passed in via arguments and copy to user memory. On |
|
* success, extent count on fieinfo is incremented. |
|
* |
|
* Returns 0 on success, -errno on error, 1 if this was the last |
|
* extent that will fit in user array. |
|
*/ |
|
#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC) |
|
#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED) |
|
#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE) |
|
int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical, |
|
u64 phys, u64 len, u32 flags) |
|
{ |
|
struct fiemap_extent extent; |
|
struct fiemap_extent __user *dest = fieinfo->fi_extents_start; |
|
|
|
/* only count the extents */ |
|
if (fieinfo->fi_extents_max == 0) { |
|
fieinfo->fi_extents_mapped++; |
|
return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; |
|
} |
|
|
|
if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max) |
|
return 1; |
|
|
|
if (flags & SET_UNKNOWN_FLAGS) |
|
flags |= FIEMAP_EXTENT_UNKNOWN; |
|
if (flags & SET_NO_UNMOUNTED_IO_FLAGS) |
|
flags |= FIEMAP_EXTENT_ENCODED; |
|
if (flags & SET_NOT_ALIGNED_FLAGS) |
|
flags |= FIEMAP_EXTENT_NOT_ALIGNED; |
|
|
|
memset(&extent, 0, sizeof(extent)); |
|
extent.fe_logical = logical; |
|
extent.fe_physical = phys; |
|
extent.fe_length = len; |
|
extent.fe_flags = flags; |
|
|
|
dest += fieinfo->fi_extents_mapped; |
|
if (copy_to_user(dest, &extent, sizeof(extent))) |
|
return -EFAULT; |
|
|
|
fieinfo->fi_extents_mapped++; |
|
if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max) |
|
return 1; |
|
return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0; |
|
} |
|
EXPORT_SYMBOL(fiemap_fill_next_extent); |
|
|
|
/** |
|
* fiemap_prep - check validity of requested flags for fiemap |
|
* @inode: Inode to operate on |
|
* @fieinfo: Fiemap context passed into ->fiemap |
|
* @start: Start of the mapped range |
|
* @len: Length of the mapped range, can be truncated by this function. |
|
* @supported_flags: Set of fiemap flags that the file system understands |
|
* |
|
* This function must be called from each ->fiemap instance to validate the |
|
* fiemap request against the file system parameters. |
|
* |
|
* Returns 0 on success, or a negative error on failure. |
|
*/ |
|
int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo, |
|
u64 start, u64 *len, u32 supported_flags) |
|
{ |
|
u64 maxbytes = inode->i_sb->s_maxbytes; |
|
u32 incompat_flags; |
|
int ret = 0; |
|
|
|
if (*len == 0) |
|
return -EINVAL; |
|
if (start > maxbytes) |
|
return -EFBIG; |
|
|
|
/* |
|
* Shrink request scope to what the fs can actually handle. |
|
*/ |
|
if (*len > maxbytes || (maxbytes - *len) < start) |
|
*len = maxbytes - start; |
|
|
|
supported_flags |= FIEMAP_FLAG_SYNC; |
|
supported_flags &= FIEMAP_FLAGS_COMPAT; |
|
incompat_flags = fieinfo->fi_flags & ~supported_flags; |
|
if (incompat_flags) { |
|
fieinfo->fi_flags = incompat_flags; |
|
return -EBADR; |
|
} |
|
|
|
if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC) |
|
ret = filemap_write_and_wait(inode->i_mapping); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(fiemap_prep); |
|
|
|
static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap) |
|
{ |
|
struct fiemap fiemap; |
|
struct fiemap_extent_info fieinfo = { 0, }; |
|
struct inode *inode = file_inode(filp); |
|
int error; |
|
|
|
if (!inode->i_op->fiemap) |
|
return -EOPNOTSUPP; |
|
|
|
if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) |
|
return -EFAULT; |
|
|
|
if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) |
|
return -EINVAL; |
|
|
|
fieinfo.fi_flags = fiemap.fm_flags; |
|
fieinfo.fi_extents_max = fiemap.fm_extent_count; |
|
fieinfo.fi_extents_start = ufiemap->fm_extents; |
|
|
|
error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, |
|
fiemap.fm_length); |
|
|
|
fiemap.fm_flags = fieinfo.fi_flags; |
|
fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; |
|
if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap))) |
|
error = -EFAULT; |
|
|
|
return error; |
|
} |
|
|
|
static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd, |
|
u64 off, u64 olen, u64 destoff) |
|
{ |
|
struct fd src_file = fdget(srcfd); |
|
loff_t cloned; |
|
int ret; |
|
|
|
if (!src_file.file) |
|
return -EBADF; |
|
ret = -EXDEV; |
|
if (src_file.file->f_path.mnt != dst_file->f_path.mnt) |
|
goto fdput; |
|
cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff, |
|
olen, 0); |
|
if (cloned < 0) |
|
ret = cloned; |
|
else if (olen && cloned != olen) |
|
ret = -EINVAL; |
|
else |
|
ret = 0; |
|
fdput: |
|
fdput(src_file); |
|
return ret; |
|
} |
|
|
|
static long ioctl_file_clone_range(struct file *file, |
|
struct file_clone_range __user *argp) |
|
{ |
|
struct file_clone_range args; |
|
|
|
if (copy_from_user(&args, argp, sizeof(args))) |
|
return -EFAULT; |
|
return ioctl_file_clone(file, args.src_fd, args.src_offset, |
|
args.src_length, args.dest_offset); |
|
} |
|
|
|
#ifdef CONFIG_BLOCK |
|
|
|
static inline sector_t logical_to_blk(struct inode *inode, loff_t offset) |
|
{ |
|
return (offset >> inode->i_blkbits); |
|
} |
|
|
|
static inline loff_t blk_to_logical(struct inode *inode, sector_t blk) |
|
{ |
|
return (blk << inode->i_blkbits); |
|
} |
|
|
|
/** |
|
* __generic_block_fiemap - FIEMAP for block based inodes (no locking) |
|
* @inode: the inode to map |
|
* @fieinfo: the fiemap info struct that will be passed back to userspace |
|
* @start: where to start mapping in the inode |
|
* @len: how much space to map |
|
* @get_block: the fs's get_block function |
|
* |
|
* This does FIEMAP for block based inodes. Basically it will just loop |
|
* through get_block until we hit the number of extents we want to map, or we |
|
* go past the end of the file and hit a hole. |
|
* |
|
* If it is possible to have data blocks beyond a hole past @inode->i_size, then |
|
* please do not use this function, it will stop at the first unmapped block |
|
* beyond i_size. |
|
* |
|
* If you use this function directly, you need to do your own locking. Use |
|
* generic_block_fiemap if you want the locking done for you. |
|
*/ |
|
static int __generic_block_fiemap(struct inode *inode, |
|
struct fiemap_extent_info *fieinfo, loff_t start, |
|
loff_t len, get_block_t *get_block) |
|
{ |
|
struct buffer_head map_bh; |
|
sector_t start_blk, last_blk; |
|
loff_t isize = i_size_read(inode); |
|
u64 logical = 0, phys = 0, size = 0; |
|
u32 flags = FIEMAP_EXTENT_MERGED; |
|
bool past_eof = false, whole_file = false; |
|
int ret = 0; |
|
|
|
ret = fiemap_prep(inode, fieinfo, start, &len, FIEMAP_FLAG_SYNC); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* Either the i_mutex or other appropriate locking needs to be held |
|
* since we expect isize to not change at all through the duration of |
|
* this call. |
|
*/ |
|
if (len >= isize) { |
|
whole_file = true; |
|
len = isize; |
|
} |
|
|
|
/* |
|
* Some filesystems can't deal with being asked to map less than |
|
* blocksize, so make sure our len is at least block length. |
|
*/ |
|
if (logical_to_blk(inode, len) == 0) |
|
len = blk_to_logical(inode, 1); |
|
|
|
start_blk = logical_to_blk(inode, start); |
|
last_blk = logical_to_blk(inode, start + len - 1); |
|
|
|
do { |
|
/* |
|
* we set b_size to the total size we want so it will map as |
|
* many contiguous blocks as possible at once |
|
*/ |
|
memset(&map_bh, 0, sizeof(struct buffer_head)); |
|
map_bh.b_size = len; |
|
|
|
ret = get_block(inode, start_blk, &map_bh, 0); |
|
if (ret) |
|
break; |
|
|
|
/* HOLE */ |
|
if (!buffer_mapped(&map_bh)) { |
|
start_blk++; |
|
|
|
/* |
|
* We want to handle the case where there is an |
|
* allocated block at the front of the file, and then |
|
* nothing but holes up to the end of the file properly, |
|
* to make sure that extent at the front gets properly |
|
* marked with FIEMAP_EXTENT_LAST |
|
*/ |
|
if (!past_eof && |
|
blk_to_logical(inode, start_blk) >= isize) |
|
past_eof = 1; |
|
|
|
/* |
|
* First hole after going past the EOF, this is our |
|
* last extent |
|
*/ |
|
if (past_eof && size) { |
|
flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST; |
|
ret = fiemap_fill_next_extent(fieinfo, logical, |
|
phys, size, |
|
flags); |
|
} else if (size) { |
|
ret = fiemap_fill_next_extent(fieinfo, logical, |
|
phys, size, flags); |
|
size = 0; |
|
} |
|
|
|
/* if we have holes up to/past EOF then we're done */ |
|
if (start_blk > last_blk || past_eof || ret) |
|
break; |
|
} else { |
|
/* |
|
* We have gone over the length of what we wanted to |
|
* map, and it wasn't the entire file, so add the extent |
|
* we got last time and exit. |
|
* |
|
* This is for the case where say we want to map all the |
|
* way up to the second to the last block in a file, but |
|
* the last block is a hole, making the second to last |
|
* block FIEMAP_EXTENT_LAST. In this case we want to |
|
* see if there is a hole after the second to last block |
|
* so we can mark it properly. If we found data after |
|
* we exceeded the length we were requesting, then we |
|
* are good to go, just add the extent to the fieinfo |
|
* and break |
|
*/ |
|
if (start_blk > last_blk && !whole_file) { |
|
ret = fiemap_fill_next_extent(fieinfo, logical, |
|
phys, size, |
|
flags); |
|
break; |
|
} |
|
|
|
/* |
|
* if size != 0 then we know we already have an extent |
|
* to add, so add it. |
|
*/ |
|
if (size) { |
|
ret = fiemap_fill_next_extent(fieinfo, logical, |
|
phys, size, |
|
flags); |
|
if (ret) |
|
break; |
|
} |
|
|
|
logical = blk_to_logical(inode, start_blk); |
|
phys = blk_to_logical(inode, map_bh.b_blocknr); |
|
size = map_bh.b_size; |
|
flags = FIEMAP_EXTENT_MERGED; |
|
|
|
start_blk += logical_to_blk(inode, size); |
|
|
|
/* |
|
* If we are past the EOF, then we need to make sure as |
|
* soon as we find a hole that the last extent we found |
|
* is marked with FIEMAP_EXTENT_LAST |
|
*/ |
|
if (!past_eof && logical + size >= isize) |
|
past_eof = true; |
|
} |
|
cond_resched(); |
|
if (fatal_signal_pending(current)) { |
|
ret = -EINTR; |
|
break; |
|
} |
|
|
|
} while (1); |
|
|
|
/* If ret is 1 then we just hit the end of the extent array */ |
|
if (ret == 1) |
|
ret = 0; |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* generic_block_fiemap - FIEMAP for block based inodes |
|
* @inode: The inode to map |
|
* @fieinfo: The mapping information |
|
* @start: The initial block to map |
|
* @len: The length of the extect to attempt to map |
|
* @get_block: The block mapping function for the fs |
|
* |
|
* Calls __generic_block_fiemap to map the inode, after taking |
|
* the inode's mutex lock. |
|
*/ |
|
|
|
int generic_block_fiemap(struct inode *inode, |
|
struct fiemap_extent_info *fieinfo, u64 start, |
|
u64 len, get_block_t *get_block) |
|
{ |
|
int ret; |
|
inode_lock(inode); |
|
ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block); |
|
inode_unlock(inode); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(generic_block_fiemap); |
|
|
|
#endif /* CONFIG_BLOCK */ |
|
|
|
/* |
|
* This provides compatibility with legacy XFS pre-allocation ioctls |
|
* which predate the fallocate syscall. |
|
* |
|
* Only the l_start, l_len and l_whence fields of the 'struct space_resv' |
|
* are used here, rest are ignored. |
|
*/ |
|
static int ioctl_preallocate(struct file *filp, int mode, void __user *argp) |
|
{ |
|
struct inode *inode = file_inode(filp); |
|
struct space_resv sr; |
|
|
|
if (copy_from_user(&sr, argp, sizeof(sr))) |
|
return -EFAULT; |
|
|
|
switch (sr.l_whence) { |
|
case SEEK_SET: |
|
break; |
|
case SEEK_CUR: |
|
sr.l_start += filp->f_pos; |
|
break; |
|
case SEEK_END: |
|
sr.l_start += i_size_read(inode); |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, |
|
sr.l_len); |
|
} |
|
|
|
/* on ia32 l_start is on a 32-bit boundary */ |
|
#if defined CONFIG_COMPAT && defined(CONFIG_X86_64) |
|
/* just account for different alignment */ |
|
static int compat_ioctl_preallocate(struct file *file, int mode, |
|
struct space_resv_32 __user *argp) |
|
{ |
|
struct inode *inode = file_inode(file); |
|
struct space_resv_32 sr; |
|
|
|
if (copy_from_user(&sr, argp, sizeof(sr))) |
|
return -EFAULT; |
|
|
|
switch (sr.l_whence) { |
|
case SEEK_SET: |
|
break; |
|
case SEEK_CUR: |
|
sr.l_start += file->f_pos; |
|
break; |
|
case SEEK_END: |
|
sr.l_start += i_size_read(inode); |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
return vfs_fallocate(file, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len); |
|
} |
|
#endif |
|
|
|
static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p) |
|
{ |
|
switch (cmd) { |
|
case FIBMAP: |
|
return ioctl_fibmap(filp, p); |
|
case FS_IOC_RESVSP: |
|
case FS_IOC_RESVSP64: |
|
return ioctl_preallocate(filp, 0, p); |
|
case FS_IOC_UNRESVSP: |
|
case FS_IOC_UNRESVSP64: |
|
return ioctl_preallocate(filp, FALLOC_FL_PUNCH_HOLE, p); |
|
case FS_IOC_ZERO_RANGE: |
|
return ioctl_preallocate(filp, FALLOC_FL_ZERO_RANGE, p); |
|
} |
|
|
|
return -ENOIOCTLCMD; |
|
} |
|
|
|
static int ioctl_fionbio(struct file *filp, int __user *argp) |
|
{ |
|
unsigned int flag; |
|
int on, error; |
|
|
|
error = get_user(on, argp); |
|
if (error) |
|
return error; |
|
flag = O_NONBLOCK; |
|
#ifdef __sparc__ |
|
/* SunOS compatibility item. */ |
|
if (O_NONBLOCK != O_NDELAY) |
|
flag |= O_NDELAY; |
|
#endif |
|
spin_lock(&filp->f_lock); |
|
if (on) |
|
filp->f_flags |= flag; |
|
else |
|
filp->f_flags &= ~flag; |
|
spin_unlock(&filp->f_lock); |
|
return error; |
|
} |
|
|
|
static int ioctl_fioasync(unsigned int fd, struct file *filp, |
|
int __user *argp) |
|
{ |
|
unsigned int flag; |
|
int on, error; |
|
|
|
error = get_user(on, argp); |
|
if (error) |
|
return error; |
|
flag = on ? FASYNC : 0; |
|
|
|
/* Did FASYNC state change ? */ |
|
if ((flag ^ filp->f_flags) & FASYNC) { |
|
if (filp->f_op->fasync) |
|
/* fasync() adjusts filp->f_flags */ |
|
error = filp->f_op->fasync(fd, filp, on); |
|
else |
|
error = -ENOTTY; |
|
} |
|
return error < 0 ? error : 0; |
|
} |
|
|
|
static int ioctl_fsfreeze(struct file *filp) |
|
{ |
|
struct super_block *sb = file_inode(filp)->i_sb; |
|
|
|
if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
/* If filesystem doesn't support freeze feature, return. */ |
|
if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL) |
|
return -EOPNOTSUPP; |
|
|
|
/* Freeze */ |
|
if (sb->s_op->freeze_super) |
|
return sb->s_op->freeze_super(sb); |
|
return freeze_super(sb); |
|
} |
|
|
|
static int ioctl_fsthaw(struct file *filp) |
|
{ |
|
struct super_block *sb = file_inode(filp)->i_sb; |
|
|
|
if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
/* Thaw */ |
|
if (sb->s_op->thaw_super) |
|
return sb->s_op->thaw_super(sb); |
|
return thaw_super(sb); |
|
} |
|
|
|
static int ioctl_file_dedupe_range(struct file *file, |
|
struct file_dedupe_range __user *argp) |
|
{ |
|
struct file_dedupe_range *same = NULL; |
|
int ret; |
|
unsigned long size; |
|
u16 count; |
|
|
|
if (get_user(count, &argp->dest_count)) { |
|
ret = -EFAULT; |
|
goto out; |
|
} |
|
|
|
size = offsetof(struct file_dedupe_range __user, info[count]); |
|
if (size > PAGE_SIZE) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
same = memdup_user(argp, size); |
|
if (IS_ERR(same)) { |
|
ret = PTR_ERR(same); |
|
same = NULL; |
|
goto out; |
|
} |
|
|
|
same->dest_count = count; |
|
ret = vfs_dedupe_file_range(file, same); |
|
if (ret) |
|
goto out; |
|
|
|
ret = copy_to_user(argp, same, size); |
|
if (ret) |
|
ret = -EFAULT; |
|
|
|
out: |
|
kfree(same); |
|
return ret; |
|
} |
|
|
|
/* |
|
* do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d. |
|
* It's just a simple helper for sys_ioctl and compat_sys_ioctl. |
|
* |
|
* When you add any new common ioctls to the switches above and below, |
|
* please ensure they have compatible arguments in compat mode. |
|
*/ |
|
static int do_vfs_ioctl(struct file *filp, unsigned int fd, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
void __user *argp = (void __user *)arg; |
|
struct inode *inode = file_inode(filp); |
|
|
|
switch (cmd) { |
|
case FIOCLEX: |
|
set_close_on_exec(fd, 1); |
|
return 0; |
|
|
|
case FIONCLEX: |
|
set_close_on_exec(fd, 0); |
|
return 0; |
|
|
|
case FIONBIO: |
|
return ioctl_fionbio(filp, argp); |
|
|
|
case FIOASYNC: |
|
return ioctl_fioasync(fd, filp, argp); |
|
|
|
case FIOQSIZE: |
|
if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) || |
|
S_ISLNK(inode->i_mode)) { |
|
loff_t res = inode_get_bytes(inode); |
|
return copy_to_user(argp, &res, sizeof(res)) ? |
|
-EFAULT : 0; |
|
} |
|
|
|
return -ENOTTY; |
|
|
|
case FIFREEZE: |
|
return ioctl_fsfreeze(filp); |
|
|
|
case FITHAW: |
|
return ioctl_fsthaw(filp); |
|
|
|
case FS_IOC_FIEMAP: |
|
return ioctl_fiemap(filp, argp); |
|
|
|
case FIGETBSZ: |
|
/* anon_bdev filesystems may not have a block size */ |
|
if (!inode->i_sb->s_blocksize) |
|
return -EINVAL; |
|
|
|
return put_user(inode->i_sb->s_blocksize, (int __user *)argp); |
|
|
|
case FICLONE: |
|
return ioctl_file_clone(filp, arg, 0, 0, 0); |
|
|
|
case FICLONERANGE: |
|
return ioctl_file_clone_range(filp, argp); |
|
|
|
case FIDEDUPERANGE: |
|
return ioctl_file_dedupe_range(filp, argp); |
|
|
|
case FIONREAD: |
|
if (!S_ISREG(inode->i_mode)) |
|
return vfs_ioctl(filp, cmd, arg); |
|
|
|
return put_user(i_size_read(inode) - filp->f_pos, |
|
(int __user *)argp); |
|
|
|
default: |
|
if (S_ISREG(inode->i_mode)) |
|
return file_ioctl(filp, cmd, argp); |
|
break; |
|
} |
|
|
|
return -ENOIOCTLCMD; |
|
} |
|
|
|
SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
|
{ |
|
struct fd f = fdget(fd); |
|
int error; |
|
|
|
if (!f.file) |
|
return -EBADF; |
|
|
|
error = security_file_ioctl(f.file, cmd, arg); |
|
if (error) |
|
goto out; |
|
|
|
error = do_vfs_ioctl(f.file, fd, cmd, arg); |
|
if (error == -ENOIOCTLCMD) |
|
error = vfs_ioctl(f.file, cmd, arg); |
|
|
|
out: |
|
fdput(f); |
|
return error; |
|
} |
|
|
|
#ifdef CONFIG_COMPAT |
|
/** |
|
* compat_ptr_ioctl - generic implementation of .compat_ioctl file operation |
|
* |
|
* This is not normally called as a function, but instead set in struct |
|
* file_operations as |
|
* |
|
* .compat_ioctl = compat_ptr_ioctl, |
|
* |
|
* On most architectures, the compat_ptr_ioctl() just passes all arguments |
|
* to the corresponding ->ioctl handler. The exception is arch/s390, where |
|
* compat_ptr() clears the top bit of a 32-bit pointer value, so user space |
|
* pointers to the second 2GB alias the first 2GB, as is the case for |
|
* native 32-bit s390 user space. |
|
* |
|
* The compat_ptr_ioctl() function must therefore be used only with ioctl |
|
* functions that either ignore the argument or pass a pointer to a |
|
* compatible data type. |
|
* |
|
* If any ioctl command handled by fops->unlocked_ioctl passes a plain |
|
* integer instead of a pointer, or any of the passed data types |
|
* is incompatible between 32-bit and 64-bit architectures, a proper |
|
* handler is required instead of compat_ptr_ioctl. |
|
*/ |
|
long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
|
{ |
|
if (!file->f_op->unlocked_ioctl) |
|
return -ENOIOCTLCMD; |
|
|
|
return file->f_op->unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); |
|
} |
|
EXPORT_SYMBOL(compat_ptr_ioctl); |
|
|
|
COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, |
|
compat_ulong_t, arg) |
|
{ |
|
struct fd f = fdget(fd); |
|
int error; |
|
|
|
if (!f.file) |
|
return -EBADF; |
|
|
|
/* RED-PEN how should LSM module know it's handling 32bit? */ |
|
error = security_file_ioctl(f.file, cmd, arg); |
|
if (error) |
|
goto out; |
|
|
|
switch (cmd) { |
|
/* FICLONE takes an int argument, so don't use compat_ptr() */ |
|
case FICLONE: |
|
error = ioctl_file_clone(f.file, arg, 0, 0, 0); |
|
break; |
|
|
|
#if defined(CONFIG_X86_64) |
|
/* these get messy on amd64 due to alignment differences */ |
|
case FS_IOC_RESVSP_32: |
|
case FS_IOC_RESVSP64_32: |
|
error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg)); |
|
break; |
|
case FS_IOC_UNRESVSP_32: |
|
case FS_IOC_UNRESVSP64_32: |
|
error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE, |
|
compat_ptr(arg)); |
|
break; |
|
case FS_IOC_ZERO_RANGE_32: |
|
error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE, |
|
compat_ptr(arg)); |
|
break; |
|
#endif |
|
|
|
/* |
|
* everything else in do_vfs_ioctl() takes either a compatible |
|
* pointer argument or no argument -- call it with a modified |
|
* argument. |
|
*/ |
|
default: |
|
error = do_vfs_ioctl(f.file, fd, cmd, |
|
(unsigned long)compat_ptr(arg)); |
|
if (error != -ENOIOCTLCMD) |
|
break; |
|
|
|
if (f.file->f_op->compat_ioctl) |
|
error = f.file->f_op->compat_ioctl(f.file, cmd, arg); |
|
if (error == -ENOIOCTLCMD) |
|
error = -ENOTTY; |
|
break; |
|
} |
|
|
|
out: |
|
fdput(f); |
|
|
|
return error; |
|
} |
|
#endif
|
|
|