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Diffstat (limited to 'drivers/staging/vboxsf/utils.c')
-rw-r--r--drivers/staging/vboxsf/utils.c551
1 files changed, 0 insertions, 551 deletions
diff --git a/drivers/staging/vboxsf/utils.c b/drivers/staging/vboxsf/utils.c
deleted file mode 100644
index 34a49e6f74fc..000000000000
--- a/drivers/staging/vboxsf/utils.c
+++ /dev/null
@@ -1,551 +0,0 @@
-// SPDX-License-Identifier: MIT
-/*
- * VirtualBox Guest Shared Folders support: Utility functions.
- * Mainly conversion from/to VirtualBox/Linux data structures.
- *
- * Copyright (C) 2006-2018 Oracle Corporation
- */
-
-#include <linux/namei.h>
-#include <linux/nls.h>
-#include <linux/sizes.h>
-#include <linux/vfs.h>
-#include "vfsmod.h"
-
-struct inode *vboxsf_new_inode(struct super_block *sb)
-{
- struct vboxsf_sbi *sbi = VBOXSF_SBI(sb);
- struct inode *inode;
- unsigned long flags;
- int cursor, ret;
- u32 gen;
-
- inode = new_inode(sb);
- if (!inode)
- return ERR_PTR(-ENOMEM);
-
- idr_preload(GFP_KERNEL);
- spin_lock_irqsave(&sbi->ino_idr_lock, flags);
- cursor = idr_get_cursor(&sbi->ino_idr);
- ret = idr_alloc_cyclic(&sbi->ino_idr, inode, 1, 0, GFP_ATOMIC);
- if (ret >= 0 && ret < cursor)
- sbi->next_generation++;
- gen = sbi->next_generation;
- spin_unlock_irqrestore(&sbi->ino_idr_lock, flags);
- idr_preload_end();
-
- if (ret < 0) {
- iput(inode);
- return ERR_PTR(ret);
- }
-
- inode->i_ino = ret;
- inode->i_generation = gen;
- return inode;
-}
-
-/* set [inode] attributes based on [info], uid/gid based on [sbi] */
-void vboxsf_init_inode(struct vboxsf_sbi *sbi, struct inode *inode,
- const struct shfl_fsobjinfo *info)
-{
- const struct shfl_fsobjattr *attr;
- s64 allocated;
- int mode;
-
- attr = &info->attr;
-
-#define mode_set(r) ((attr->mode & (SHFL_UNIX_##r)) ? (S_##r) : 0)
-
- mode = mode_set(IRUSR);
- mode |= mode_set(IWUSR);
- mode |= mode_set(IXUSR);
-
- mode |= mode_set(IRGRP);
- mode |= mode_set(IWGRP);
- mode |= mode_set(IXGRP);
-
- mode |= mode_set(IROTH);
- mode |= mode_set(IWOTH);
- mode |= mode_set(IXOTH);
-
-#undef mode_set
-
- /* We use the host-side values for these */
- inode->i_flags |= S_NOATIME | S_NOCMTIME;
- inode->i_mapping->a_ops = &vboxsf_reg_aops;
-
- if (SHFL_IS_DIRECTORY(attr->mode)) {
- inode->i_mode = sbi->o.dmode_set ? sbi->o.dmode : mode;
- inode->i_mode &= ~sbi->o.dmask;
- inode->i_mode |= S_IFDIR;
- inode->i_op = &vboxsf_dir_iops;
- inode->i_fop = &vboxsf_dir_fops;
- /*
- * XXX: this probably should be set to the number of entries
- * in the directory plus two (. ..)
- */
- set_nlink(inode, 1);
- } else if (SHFL_IS_SYMLINK(attr->mode)) {
- inode->i_mode = sbi->o.fmode_set ? sbi->o.fmode : mode;
- inode->i_mode &= ~sbi->o.fmask;
- inode->i_mode |= S_IFLNK;
- inode->i_op = &vboxsf_lnk_iops;
- set_nlink(inode, 1);
- } else {
- inode->i_mode = sbi->o.fmode_set ? sbi->o.fmode : mode;
- inode->i_mode &= ~sbi->o.fmask;
- inode->i_mode |= S_IFREG;
- inode->i_op = &vboxsf_reg_iops;
- inode->i_fop = &vboxsf_reg_fops;
- set_nlink(inode, 1);
- }
-
- inode->i_uid = sbi->o.uid;
- inode->i_gid = sbi->o.gid;
-
- inode->i_size = info->size;
- inode->i_blkbits = 12;
- /* i_blocks always in units of 512 bytes! */
- allocated = info->allocated + 511;
- do_div(allocated, 512);
- inode->i_blocks = allocated;
-
- inode->i_atime = ns_to_timespec64(
- info->access_time.ns_relative_to_unix_epoch);
- inode->i_ctime = ns_to_timespec64(
- info->change_time.ns_relative_to_unix_epoch);
- inode->i_mtime = ns_to_timespec64(
- info->modification_time.ns_relative_to_unix_epoch);
-}
-
-int vboxsf_create_at_dentry(struct dentry *dentry,
- struct shfl_createparms *params)
-{
- struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
- struct shfl_string *path;
- int err;
-
- path = vboxsf_path_from_dentry(sbi, dentry);
- if (IS_ERR(path))
- return PTR_ERR(path);
-
- err = vboxsf_create(sbi->root, path, params);
- __putname(path);
-
- return err;
-}
-
-int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
- struct shfl_fsobjinfo *info)
-{
- struct shfl_createparms params = {};
- int err;
-
- params.handle = SHFL_HANDLE_NIL;
- params.create_flags = SHFL_CF_LOOKUP | SHFL_CF_ACT_FAIL_IF_NEW;
-
- err = vboxsf_create(sbi->root, path, &params);
- if (err)
- return err;
-
- if (params.result != SHFL_FILE_EXISTS)
- return -ENOENT;
-
- if (info)
- *info = params.info;
-
- return 0;
-}
-
-int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info)
-{
- struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
- struct shfl_string *path;
- int err;
-
- path = vboxsf_path_from_dentry(sbi, dentry);
- if (IS_ERR(path))
- return PTR_ERR(path);
-
- err = vboxsf_stat(sbi, path, info);
- __putname(path);
- return err;
-}
-
-int vboxsf_inode_revalidate(struct dentry *dentry)
-{
- struct vboxsf_sbi *sbi;
- struct vboxsf_inode *sf_i;
- struct shfl_fsobjinfo info;
- struct timespec64 prev_mtime;
- struct inode *inode;
- int err;
-
- if (!dentry || !d_really_is_positive(dentry))
- return -EINVAL;
-
- inode = d_inode(dentry);
- prev_mtime = inode->i_mtime;
- sf_i = VBOXSF_I(inode);
- sbi = VBOXSF_SBI(dentry->d_sb);
- if (!sf_i->force_restat) {
- if (time_before(jiffies, dentry->d_time + sbi->o.ttl))
- return 0;
- }
-
- err = vboxsf_stat_dentry(dentry, &info);
- if (err)
- return err;
-
- dentry->d_time = jiffies;
- sf_i->force_restat = 0;
- vboxsf_init_inode(sbi, inode, &info);
-
- /*
- * If the file was changed on the host side we need to invalidate the
- * page-cache for it. Note this also gets triggered by our own writes,
- * this is unavoidable.
- */
- if (timespec64_compare(&inode->i_mtime, &prev_mtime) > 0)
- invalidate_inode_pages2(inode->i_mapping);
-
- return 0;
-}
-
-int vboxsf_getattr(const struct path *path, struct kstat *kstat,
- u32 request_mask, unsigned int flags)
-{
- int err;
- struct dentry *dentry = path->dentry;
- struct inode *inode = d_inode(dentry);
- struct vboxsf_inode *sf_i = VBOXSF_I(inode);
-
- switch (flags & AT_STATX_SYNC_TYPE) {
- case AT_STATX_DONT_SYNC:
- err = 0;
- break;
- case AT_STATX_FORCE_SYNC:
- sf_i->force_restat = 1;
- /* fall-through */
- default:
- err = vboxsf_inode_revalidate(dentry);
- }
- if (err)
- return err;
-
- generic_fillattr(d_inode(dentry), kstat);
- return 0;
-}
-
-int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr)
-{
- struct vboxsf_inode *sf_i = VBOXSF_I(d_inode(dentry));
- struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
- struct shfl_createparms params = {};
- struct shfl_fsobjinfo info = {};
- u32 buf_len;
- int err;
-
- params.handle = SHFL_HANDLE_NIL;
- params.create_flags = SHFL_CF_ACT_OPEN_IF_EXISTS |
- SHFL_CF_ACT_FAIL_IF_NEW |
- SHFL_CF_ACCESS_ATTR_WRITE;
-
- /* this is at least required for Posix hosts */
- if (iattr->ia_valid & ATTR_SIZE)
- params.create_flags |= SHFL_CF_ACCESS_WRITE;
-
- err = vboxsf_create_at_dentry(dentry, &params);
- if (err || params.result != SHFL_FILE_EXISTS)
- return err ? err : -ENOENT;
-
-#define mode_set(r) ((iattr->ia_mode & (S_##r)) ? SHFL_UNIX_##r : 0)
-
- /*
- * Setting the file size and setting the other attributes has to
- * be handled separately.
- */
- if (iattr->ia_valid & (ATTR_MODE | ATTR_ATIME | ATTR_MTIME)) {
- if (iattr->ia_valid & ATTR_MODE) {
- info.attr.mode = mode_set(IRUSR);
- info.attr.mode |= mode_set(IWUSR);
- info.attr.mode |= mode_set(IXUSR);
- info.attr.mode |= mode_set(IRGRP);
- info.attr.mode |= mode_set(IWGRP);
- info.attr.mode |= mode_set(IXGRP);
- info.attr.mode |= mode_set(IROTH);
- info.attr.mode |= mode_set(IWOTH);
- info.attr.mode |= mode_set(IXOTH);
-
- if (iattr->ia_mode & S_IFDIR)
- info.attr.mode |= SHFL_TYPE_DIRECTORY;
- else
- info.attr.mode |= SHFL_TYPE_FILE;
- }
-
- if (iattr->ia_valid & ATTR_ATIME)
- info.access_time.ns_relative_to_unix_epoch =
- timespec64_to_ns(&iattr->ia_atime);
-
- if (iattr->ia_valid & ATTR_MTIME)
- info.modification_time.ns_relative_to_unix_epoch =
- timespec64_to_ns(&iattr->ia_mtime);
-
- /*
- * Ignore ctime (inode change time) as it can't be set
- * from userland anyway.
- */
-
- buf_len = sizeof(info);
- err = vboxsf_fsinfo(sbi->root, params.handle,
- SHFL_INFO_SET | SHFL_INFO_FILE, &buf_len,
- &info);
- if (err) {
- vboxsf_close(sbi->root, params.handle);
- return err;
- }
-
- /* the host may have given us different attr then requested */
- sf_i->force_restat = 1;
- }
-
-#undef mode_set
-
- if (iattr->ia_valid & ATTR_SIZE) {
- memset(&info, 0, sizeof(info));
- info.size = iattr->ia_size;
- buf_len = sizeof(info);
- err = vboxsf_fsinfo(sbi->root, params.handle,
- SHFL_INFO_SET | SHFL_INFO_SIZE, &buf_len,
- &info);
- if (err) {
- vboxsf_close(sbi->root, params.handle);
- return err;
- }
-
- /* the host may have given us different attr then requested */
- sf_i->force_restat = 1;
- }
-
- vboxsf_close(sbi->root, params.handle);
-
- /* Update the inode with what the host has actually given us. */
- if (sf_i->force_restat)
- vboxsf_inode_revalidate(dentry);
-
- return 0;
-}
-
-/*
- * [dentry] contains string encoded in coding system that corresponds
- * to [sbi]->nls, we must convert it to UTF8 here.
- * Returns a shfl_string allocated through __getname (must be freed using
- * __putname), or an ERR_PTR on error.
- */
-struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
- struct dentry *dentry)
-{
- struct shfl_string *shfl_path;
- int path_len, out_len, nb;
- char *buf, *path;
- wchar_t uni;
- u8 *out;
-
- buf = __getname();
- if (!buf)
- return ERR_PTR(-ENOMEM);
-
- path = dentry_path_raw(dentry, buf, PATH_MAX);
- if (IS_ERR(path)) {
- __putname(buf);
- return (struct shfl_string *)path;
- }
- path_len = strlen(path);
-
- if (sbi->nls) {
- shfl_path = __getname();
- if (!shfl_path) {
- __putname(buf);
- return ERR_PTR(-ENOMEM);
- }
-
- out = shfl_path->string.utf8;
- out_len = PATH_MAX - SHFLSTRING_HEADER_SIZE - 1;
-
- while (path_len) {
- nb = sbi->nls->char2uni(path, path_len, &uni);
- if (nb < 0) {
- __putname(shfl_path);
- __putname(buf);
- return ERR_PTR(-EINVAL);
- }
- path += nb;
- path_len -= nb;
-
- nb = utf32_to_utf8(uni, out, out_len);
- if (nb < 0) {
- __putname(shfl_path);
- __putname(buf);
- return ERR_PTR(-ENAMETOOLONG);
- }
- out += nb;
- out_len -= nb;
- }
- *out = 0;
- shfl_path->length = out - shfl_path->string.utf8;
- shfl_path->size = shfl_path->length + 1;
- __putname(buf);
- } else {
- if ((SHFLSTRING_HEADER_SIZE + path_len + 1) > PATH_MAX) {
- __putname(buf);
- return ERR_PTR(-ENAMETOOLONG);
- }
- /*
- * dentry_path stores the name at the end of buf, but the
- * shfl_string string we return must be properly aligned.
- */
- shfl_path = (struct shfl_string *)buf;
- memmove(shfl_path->string.utf8, path, path_len);
- shfl_path->string.utf8[path_len] = 0;
- shfl_path->length = path_len;
- shfl_path->size = path_len + 1;
- }
-
- return shfl_path;
-}
-
-int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
- const unsigned char *utf8_name, size_t utf8_len)
-{
- const char *in;
- char *out;
- size_t out_len;
- size_t out_bound_len;
- size_t in_bound_len;
-
- in = utf8_name;
- in_bound_len = utf8_len;
-
- out = name;
- out_len = 0;
- /* Reserve space for terminating 0 */
- out_bound_len = name_bound_len - 1;
-
- while (in_bound_len) {
- int nb;
- unicode_t uni;
-
- nb = utf8_to_utf32(in, in_bound_len, &uni);
- if (nb < 0)
- return -EINVAL;
-
- in += nb;
- in_bound_len -= nb;
-
- nb = sbi->nls->uni2char(uni, out, out_bound_len);
- if (nb < 0)
- return nb;
-
- out += nb;
- out_bound_len -= nb;
- out_len += nb;
- }
-
- *out = 0;
-
- return 0;
-}
-
-static struct vboxsf_dir_buf *vboxsf_dir_buf_alloc(struct list_head *list)
-{
- struct vboxsf_dir_buf *b;
-
- b = kmalloc(sizeof(*b), GFP_KERNEL);
- if (!b)
- return NULL;
-
- b->buf = kmalloc(DIR_BUFFER_SIZE, GFP_KERNEL);
- if (!b->buf) {
- kfree(b);
- return NULL;
- }
-
- b->entries = 0;
- b->used = 0;
- b->free = DIR_BUFFER_SIZE;
- list_add(&b->head, list);
-
- return b;
-}
-
-static void vboxsf_dir_buf_free(struct vboxsf_dir_buf *b)
-{
- list_del(&b->head);
- kfree(b->buf);
- kfree(b);
-}
-
-struct vboxsf_dir_info *vboxsf_dir_info_alloc(void)
-{
- struct vboxsf_dir_info *p;
-
- p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return NULL;
-
- INIT_LIST_HEAD(&p->info_list);
- return p;
-}
-
-void vboxsf_dir_info_free(struct vboxsf_dir_info *p)
-{
- struct list_head *list, *pos, *tmp;
-
- list = &p->info_list;
- list_for_each_safe(pos, tmp, list) {
- struct vboxsf_dir_buf *b;
-
- b = list_entry(pos, struct vboxsf_dir_buf, head);
- vboxsf_dir_buf_free(b);
- }
- kfree(p);
-}
-
-int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,
- u64 handle)
-{
- struct vboxsf_dir_buf *b;
- u32 entries, size;
- int err = 0;
- void *buf;
-
- /* vboxsf_dirinfo returns 1 on end of dir */
- while (err == 0) {
- b = vboxsf_dir_buf_alloc(&sf_d->info_list);
- if (!b) {
- err = -ENOMEM;
- break;
- }
-
- buf = b->buf;
- size = b->free;
-
- err = vboxsf_dirinfo(sbi->root, handle, NULL, 0, 0,
- &size, buf, &entries);
- if (err < 0)
- break;
-
- b->entries += entries;
- b->free -= size;
- b->used += size;
- }
-
- if (b && b->used == 0)
- vboxsf_dir_buf_free(b);
-
- /* -EILSEQ means the host could not translate a filename, ignore */
- if (err > 0 || err == -EILSEQ)
- err = 0;
-
- return err;
-}