mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 17:18:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
468
fs/fat/file.c
Normal file
468
fs/fat/file.c
Normal file
|
|
@ -0,0 +1,468 @@
|
|||
/*
|
||||
* linux/fs/fat/file.c
|
||||
*
|
||||
* Written 1992,1993 by Werner Almesberger
|
||||
*
|
||||
* regular file handling primitives for fat-based filesystems
|
||||
*/
|
||||
|
||||
#include <linux/capability.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/compat.h>
|
||||
#include <linux/mount.h>
|
||||
#include <linux/time.h>
|
||||
#include <linux/buffer_head.h>
|
||||
#include <linux/writeback.h>
|
||||
#include <linux/backing-dev.h>
|
||||
#include <linux/blkdev.h>
|
||||
#include <linux/fsnotify.h>
|
||||
#include <linux/security.h>
|
||||
#include "fat.h"
|
||||
|
||||
static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
|
||||
{
|
||||
u32 attr;
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
attr = fat_make_attrs(inode);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
return put_user(attr, user_attr);
|
||||
}
|
||||
|
||||
static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
|
||||
{
|
||||
struct inode *inode = file_inode(file);
|
||||
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
|
||||
int is_dir = S_ISDIR(inode->i_mode);
|
||||
u32 attr, oldattr;
|
||||
struct iattr ia;
|
||||
int err;
|
||||
|
||||
err = get_user(attr, user_attr);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = mnt_want_write_file(file);
|
||||
if (err)
|
||||
goto out;
|
||||
mutex_lock(&inode->i_mutex);
|
||||
|
||||
/*
|
||||
* ATTR_VOLUME and ATTR_DIR cannot be changed; this also
|
||||
* prevents the user from turning us into a VFAT
|
||||
* longname entry. Also, we obviously can't set
|
||||
* any of the NTFS attributes in the high 24 bits.
|
||||
*/
|
||||
attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
|
||||
/* Merge in ATTR_VOLUME and ATTR_DIR */
|
||||
attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
|
||||
(is_dir ? ATTR_DIR : 0);
|
||||
oldattr = fat_make_attrs(inode);
|
||||
|
||||
/* Equivalent to a chmod() */
|
||||
ia.ia_valid = ATTR_MODE | ATTR_CTIME;
|
||||
ia.ia_ctime = current_fs_time(inode->i_sb);
|
||||
if (is_dir)
|
||||
ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
|
||||
else {
|
||||
ia.ia_mode = fat_make_mode(sbi, attr,
|
||||
S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
|
||||
}
|
||||
|
||||
/* The root directory has no attributes */
|
||||
if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
|
||||
err = -EINVAL;
|
||||
goto out_unlock_inode;
|
||||
}
|
||||
|
||||
if (sbi->options.sys_immutable &&
|
||||
((attr | oldattr) & ATTR_SYS) &&
|
||||
!capable(CAP_LINUX_IMMUTABLE)) {
|
||||
err = -EPERM;
|
||||
goto out_unlock_inode;
|
||||
}
|
||||
|
||||
/*
|
||||
* The security check is questionable... We single
|
||||
* out the RO attribute for checking by the security
|
||||
* module, just because it maps to a file mode.
|
||||
*/
|
||||
err = security_inode_setattr(file->f_path.dentry, &ia);
|
||||
if (err)
|
||||
goto out_unlock_inode;
|
||||
|
||||
/* This MUST be done before doing anything irreversible... */
|
||||
err = fat_setattr(file->f_path.dentry, &ia);
|
||||
if (err)
|
||||
goto out_unlock_inode;
|
||||
|
||||
fsnotify_change(file->f_path.dentry, ia.ia_valid);
|
||||
if (sbi->options.sys_immutable) {
|
||||
if (attr & ATTR_SYS)
|
||||
inode->i_flags |= S_IMMUTABLE;
|
||||
else
|
||||
inode->i_flags &= ~S_IMMUTABLE;
|
||||
}
|
||||
|
||||
fat_save_attrs(inode, attr);
|
||||
mark_inode_dirty(inode);
|
||||
out_unlock_inode:
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
mnt_drop_write_file(file);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr)
|
||||
{
|
||||
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
|
||||
return put_user(sbi->vol_id, user_attr);
|
||||
}
|
||||
|
||||
long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct inode *inode = file_inode(filp);
|
||||
u32 __user *user_attr = (u32 __user *)arg;
|
||||
|
||||
switch (cmd) {
|
||||
case FAT_IOCTL_GET_ATTRIBUTES:
|
||||
return fat_ioctl_get_attributes(inode, user_attr);
|
||||
case FAT_IOCTL_SET_ATTRIBUTES:
|
||||
return fat_ioctl_set_attributes(filp, user_attr);
|
||||
case FAT_IOCTL_GET_VOLUME_ID:
|
||||
return fat_ioctl_get_volume_id(inode, user_attr);
|
||||
default:
|
||||
return -ENOTTY; /* Inappropriate ioctl for device */
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
static long fat_generic_compat_ioctl(struct file *filp, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
|
||||
{
|
||||
return fat_generic_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
|
||||
}
|
||||
#endif
|
||||
|
||||
static int fat_file_release(struct inode *inode, struct file *filp)
|
||||
{
|
||||
if ((filp->f_mode & FMODE_WRITE) &&
|
||||
MSDOS_SB(inode->i_sb)->options.flush) {
|
||||
fat_flush_inodes(inode->i_sb, inode, NULL);
|
||||
congestion_wait(BLK_RW_ASYNC, HZ/10);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
|
||||
{
|
||||
struct inode *inode = filp->f_mapping->host;
|
||||
int res, err;
|
||||
|
||||
res = generic_file_fsync(filp, start, end, datasync);
|
||||
err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping);
|
||||
|
||||
return res ? res : err;
|
||||
}
|
||||
|
||||
|
||||
const struct file_operations fat_file_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = new_sync_read,
|
||||
.write = new_sync_write,
|
||||
.read_iter = generic_file_read_iter,
|
||||
.write_iter = generic_file_write_iter,
|
||||
.mmap = generic_file_mmap,
|
||||
.release = fat_file_release,
|
||||
.unlocked_ioctl = fat_generic_ioctl,
|
||||
#ifdef CONFIG_COMPAT
|
||||
.compat_ioctl = fat_generic_compat_ioctl,
|
||||
#endif
|
||||
.fsync = fat_file_fsync,
|
||||
.splice_read = generic_file_splice_read,
|
||||
};
|
||||
|
||||
static int fat_cont_expand(struct inode *inode, loff_t size)
|
||||
{
|
||||
struct address_space *mapping = inode->i_mapping;
|
||||
loff_t start = inode->i_size, count = size - inode->i_size;
|
||||
int err;
|
||||
|
||||
err = generic_cont_expand_simple(inode, size);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
|
||||
mark_inode_dirty(inode);
|
||||
if (IS_SYNC(inode)) {
|
||||
int err2;
|
||||
|
||||
/*
|
||||
* Opencode syncing since we don't have a file open to use
|
||||
* standard fsync path.
|
||||
*/
|
||||
err = filemap_fdatawrite_range(mapping, start,
|
||||
start + count - 1);
|
||||
err2 = sync_mapping_buffers(mapping);
|
||||
if (!err)
|
||||
err = err2;
|
||||
err2 = write_inode_now(inode, 1);
|
||||
if (!err)
|
||||
err = err2;
|
||||
if (!err) {
|
||||
err = filemap_fdatawait_range(mapping, start,
|
||||
start + count - 1);
|
||||
}
|
||||
}
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
/* Free all clusters after the skip'th cluster. */
|
||||
static int fat_free(struct inode *inode, int skip)
|
||||
{
|
||||
struct super_block *sb = inode->i_sb;
|
||||
int err, wait, free_start, i_start, i_logstart;
|
||||
|
||||
if (MSDOS_I(inode)->i_start == 0)
|
||||
return 0;
|
||||
|
||||
fat_cache_inval_inode(inode);
|
||||
|
||||
wait = IS_DIRSYNC(inode);
|
||||
i_start = free_start = MSDOS_I(inode)->i_start;
|
||||
i_logstart = MSDOS_I(inode)->i_logstart;
|
||||
|
||||
/* First, we write the new file size. */
|
||||
if (!skip) {
|
||||
MSDOS_I(inode)->i_start = 0;
|
||||
MSDOS_I(inode)->i_logstart = 0;
|
||||
}
|
||||
MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
|
||||
inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
|
||||
if (wait) {
|
||||
err = fat_sync_inode(inode);
|
||||
if (err) {
|
||||
MSDOS_I(inode)->i_start = i_start;
|
||||
MSDOS_I(inode)->i_logstart = i_logstart;
|
||||
return err;
|
||||
}
|
||||
} else
|
||||
mark_inode_dirty(inode);
|
||||
|
||||
/* Write a new EOF, and get the remaining cluster chain for freeing. */
|
||||
if (skip) {
|
||||
struct fat_entry fatent;
|
||||
int ret, fclus, dclus;
|
||||
|
||||
ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
else if (ret == FAT_ENT_EOF)
|
||||
return 0;
|
||||
|
||||
fatent_init(&fatent);
|
||||
ret = fat_ent_read(inode, &fatent, dclus);
|
||||
if (ret == FAT_ENT_EOF) {
|
||||
fatent_brelse(&fatent);
|
||||
return 0;
|
||||
} else if (ret == FAT_ENT_FREE) {
|
||||
fat_fs_error(sb,
|
||||
"%s: invalid cluster chain (i_pos %lld)",
|
||||
__func__, MSDOS_I(inode)->i_pos);
|
||||
ret = -EIO;
|
||||
} else if (ret > 0) {
|
||||
err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
|
||||
if (err)
|
||||
ret = err;
|
||||
}
|
||||
fatent_brelse(&fatent);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
free_start = ret;
|
||||
}
|
||||
inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
|
||||
|
||||
/* Freeing the remained cluster chain */
|
||||
return fat_free_clusters(inode, free_start);
|
||||
}
|
||||
|
||||
void fat_truncate_blocks(struct inode *inode, loff_t offset)
|
||||
{
|
||||
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
|
||||
const unsigned int cluster_size = sbi->cluster_size;
|
||||
int nr_clusters;
|
||||
|
||||
/*
|
||||
* This protects against truncating a file bigger than it was then
|
||||
* trying to write into the hole.
|
||||
*/
|
||||
if (MSDOS_I(inode)->mmu_private > offset)
|
||||
MSDOS_I(inode)->mmu_private = offset;
|
||||
|
||||
nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits;
|
||||
|
||||
fat_free(inode, nr_clusters);
|
||||
fat_flush_inodes(inode->i_sb, inode, NULL);
|
||||
}
|
||||
|
||||
int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
generic_fillattr(inode, stat);
|
||||
stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
|
||||
|
||||
if (MSDOS_SB(inode->i_sb)->options.nfs == FAT_NFS_NOSTALE_RO) {
|
||||
/* Use i_pos for ino. This is used as fileid of nfs. */
|
||||
stat->ino = fat_i_pos_read(MSDOS_SB(inode->i_sb), inode);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(fat_getattr);
|
||||
|
||||
static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
|
||||
struct inode *inode, umode_t *mode_ptr)
|
||||
{
|
||||
umode_t mask, perm;
|
||||
|
||||
/*
|
||||
* Note, the basic check is already done by a caller of
|
||||
* (attr->ia_mode & ~FAT_VALID_MODE)
|
||||
*/
|
||||
|
||||
if (S_ISREG(inode->i_mode))
|
||||
mask = sbi->options.fs_fmask;
|
||||
else
|
||||
mask = sbi->options.fs_dmask;
|
||||
|
||||
perm = *mode_ptr & ~(S_IFMT | mask);
|
||||
|
||||
/*
|
||||
* Of the r and x bits, all (subject to umask) must be present. Of the
|
||||
* w bits, either all (subject to umask) or none must be present.
|
||||
*
|
||||
* If fat_mode_can_hold_ro(inode) is false, can't change w bits.
|
||||
*/
|
||||
if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
|
||||
return -EPERM;
|
||||
if (fat_mode_can_hold_ro(inode)) {
|
||||
if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
|
||||
return -EPERM;
|
||||
} else {
|
||||
if ((perm & S_IWUGO) != (S_IWUGO & ~mask))
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
*mode_ptr &= S_IFMT | perm;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
|
||||
{
|
||||
umode_t allow_utime = sbi->options.allow_utime;
|
||||
|
||||
if (!uid_eq(current_fsuid(), inode->i_uid)) {
|
||||
if (in_group_p(inode->i_gid))
|
||||
allow_utime >>= 3;
|
||||
if (allow_utime & MAY_WRITE)
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* use a default check */
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
|
||||
/* valid file mode bits */
|
||||
#define FAT_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXUGO)
|
||||
|
||||
int fat_setattr(struct dentry *dentry, struct iattr *attr)
|
||||
{
|
||||
struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
|
||||
struct inode *inode = dentry->d_inode;
|
||||
unsigned int ia_valid;
|
||||
int error;
|
||||
|
||||
/* Check for setting the inode time. */
|
||||
ia_valid = attr->ia_valid;
|
||||
if (ia_valid & TIMES_SET_FLAGS) {
|
||||
if (fat_allow_set_time(sbi, inode))
|
||||
attr->ia_valid &= ~TIMES_SET_FLAGS;
|
||||
}
|
||||
|
||||
error = inode_change_ok(inode, attr);
|
||||
attr->ia_valid = ia_valid;
|
||||
if (error) {
|
||||
if (sbi->options.quiet)
|
||||
error = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* Expand the file. Since inode_setattr() updates ->i_size
|
||||
* before calling the ->truncate(), but FAT needs to fill the
|
||||
* hole before it. XXX: this is no longer true with new truncate
|
||||
* sequence.
|
||||
*/
|
||||
if (attr->ia_valid & ATTR_SIZE) {
|
||||
inode_dio_wait(inode);
|
||||
|
||||
if (attr->ia_size > inode->i_size) {
|
||||
error = fat_cont_expand(inode, attr->ia_size);
|
||||
if (error || attr->ia_valid == ATTR_SIZE)
|
||||
goto out;
|
||||
attr->ia_valid &= ~ATTR_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
if (((attr->ia_valid & ATTR_UID) &&
|
||||
(!uid_eq(attr->ia_uid, sbi->options.fs_uid))) ||
|
||||
((attr->ia_valid & ATTR_GID) &&
|
||||
(!gid_eq(attr->ia_gid, sbi->options.fs_gid))) ||
|
||||
((attr->ia_valid & ATTR_MODE) &&
|
||||
(attr->ia_mode & ~FAT_VALID_MODE)))
|
||||
error = -EPERM;
|
||||
|
||||
if (error) {
|
||||
if (sbi->options.quiet)
|
||||
error = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* We don't return -EPERM here. Yes, strange, but this is too
|
||||
* old behavior.
|
||||
*/
|
||||
if (attr->ia_valid & ATTR_MODE) {
|
||||
if (fat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
|
||||
attr->ia_valid &= ~ATTR_MODE;
|
||||
}
|
||||
|
||||
if (attr->ia_valid & ATTR_SIZE) {
|
||||
down_write(&MSDOS_I(inode)->truncate_lock);
|
||||
truncate_setsize(inode, attr->ia_size);
|
||||
fat_truncate_blocks(inode, attr->ia_size);
|
||||
up_write(&MSDOS_I(inode)->truncate_lock);
|
||||
}
|
||||
|
||||
setattr_copy(inode, attr);
|
||||
mark_inode_dirty(inode);
|
||||
out:
|
||||
return error;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(fat_setattr);
|
||||
|
||||
const struct inode_operations fat_file_inode_operations = {
|
||||
.setattr = fat_setattr,
|
||||
.getattr = fat_getattr,
|
||||
#ifdef CONFIG_FAT_VIRTUAL_XATTR
|
||||
.setxattr = fat_setxattr,
|
||||
.getxattr = fat_getxattr,
|
||||
.listxattr = fat_listxattr,
|
||||
.removexattr = fat_removexattr,
|
||||
#endif
|
||||
};
|
||||
Loading…
Add table
Add a link
Reference in a new issue