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Diffstat (limited to 'fs/hostfs/hostfs_kern.c')
-rw-r--r--fs/hostfs/hostfs_kern.c85
1 files changed, 48 insertions, 37 deletions
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index e6b8c49076bb..277468783fee 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -14,6 +14,7 @@
#include <linux/statfs.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
+#include <linux/writeback.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include "hostfs.h"
@@ -34,6 +35,8 @@ static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
#define FILE_HOSTFS_I(file) HOSTFS_I(file_inode(file))
+static struct kmem_cache *hostfs_inode_cache;
+
/* Changed in hostfs_args before the kernel starts running */
static char *root_ino = "";
static int append = 0;
@@ -100,7 +103,7 @@ static char *__dentry_name(struct dentry *dentry, char *name)
*/
BUG_ON(p + strlen(p) + 1 != name + PATH_MAX);
- strlcpy(name, root, PATH_MAX);
+ strscpy(name, root, PATH_MAX);
if (len > p - name) {
__putname(name);
return NULL;
@@ -139,10 +142,10 @@ static char *inode_name(struct inode *ino)
static char *follow_link(char *link)
{
- int len, n;
char *name, *resolved, *end;
+ int n;
- name = __getname();
+ name = kmalloc(PATH_MAX, GFP_KERNEL);
if (!name) {
n = -ENOMEM;
goto out_free;
@@ -164,21 +167,18 @@ static char *follow_link(char *link)
return name;
*(end + 1) = '\0';
- len = strlen(link) + strlen(name) + 1;
- resolved = kmalloc(len, GFP_KERNEL);
+ resolved = kasprintf(GFP_KERNEL, "%s%s", link, name);
if (resolved == NULL) {
n = -ENOMEM;
goto out_free;
}
- sprintf(resolved, "%s%s", link, name);
- __putname(name);
- kfree(link);
+ kfree(name);
return resolved;
out_free:
- __putname(name);
+ kfree(name);
return ERR_PTR(n);
}
@@ -223,7 +223,7 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
{
struct hostfs_inode_info *hi;
- hi = kmalloc(sizeof(*hi), GFP_KERNEL_ACCOUNT);
+ hi = alloc_inode_sb(sb, hostfs_inode_cache, GFP_KERNEL_ACCOUNT);
if (hi == NULL)
return NULL;
hi->fd = -1;
@@ -245,7 +245,7 @@ static void hostfs_evict_inode(struct inode *inode)
static void hostfs_free_inode(struct inode *inode)
{
- kfree(HOSTFS_I(inode));
+ kmem_cache_free(hostfs_inode_cache, HOSTFS_I(inode));
}
static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
@@ -317,7 +317,7 @@ retry:
if (mode & FMODE_WRITE)
r = w = 1;
- name = dentry_name(file->f_path.dentry);
+ name = dentry_name(file_dentry(file));
if (name == NULL)
return -ENOMEM;
@@ -382,6 +382,7 @@ static int hostfs_fsync(struct file *file, loff_t start, loff_t end,
static const struct file_operations hostfs_file_fops = {
.llseek = generic_file_llseek,
.splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
.read_iter = generic_file_read_iter,
.write_iter = generic_file_write_iter,
.mmap = generic_file_mmap,
@@ -415,15 +416,15 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
if (err != count) {
- ClearPageUptodate(page);
+ if (err >= 0)
+ err = -EIO;
+ mapping_set_error(mapping, err);
goto out;
}
if (base > inode->i_size)
inode->i_size = base;
- if (PageError(page))
- ClearPageError(page);
err = 0;
out:
@@ -433,8 +434,9 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
return err;
}
-static int hostfs_readpage(struct file *file, struct page *page)
+static int hostfs_read_folio(struct file *file, struct folio *folio)
{
+ struct page *page = &folio->page;
char *buffer;
loff_t start = page_offset(page);
int bytes_read, ret = 0;
@@ -462,12 +464,12 @@ static int hostfs_readpage(struct file *file, struct page *page)
}
static int hostfs_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
+ loff_t pos, unsigned len,
struct page **pagep, void **fsdata)
{
pgoff_t index = pos >> PAGE_SHIFT;
- *pagep = grab_cache_page_write_begin(mapping, index, flags);
+ *pagep = grab_cache_page_write_begin(mapping, index);
if (!*pagep)
return -ENOMEM;
return 0;
@@ -503,8 +505,8 @@ static int hostfs_write_end(struct file *file, struct address_space *mapping,
static const struct address_space_operations hostfs_aops = {
.writepage = hostfs_writepage,
- .readpage = hostfs_readpage,
- .set_page_dirty = __set_page_dirty_nobuffers,
+ .read_folio = hostfs_read_folio,
+ .dirty_folio = filemap_dirty_folio,
.write_begin = hostfs_write_begin,
.write_end = hostfs_write_end,
};
@@ -557,8 +559,8 @@ static int read_name(struct inode *ino, char *name)
return 0;
}
-static int hostfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool excl)
+static int hostfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
{
struct inode *inode;
char *name;
@@ -656,8 +658,8 @@ static int hostfs_unlink(struct inode *ino, struct dentry *dentry)
return err;
}
-static int hostfs_symlink(struct inode *ino, struct dentry *dentry,
- const char *to)
+static int hostfs_symlink(struct user_namespace *mnt_userns, struct inode *ino,
+ struct dentry *dentry, const char *to)
{
char *file;
int err;
@@ -669,7 +671,8 @@ static int hostfs_symlink(struct inode *ino, struct dentry *dentry,
return err;
}
-static int hostfs_mkdir(struct inode *ino, struct dentry *dentry, umode_t mode)
+static int hostfs_mkdir(struct user_namespace *mnt_userns, struct inode *ino,
+ struct dentry *dentry, umode_t mode)
{
char *file;
int err;
@@ -693,7 +696,8 @@ static int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
return err;
}
-static int hostfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
+static int hostfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, dev_t dev)
{
struct inode *inode;
char *name;
@@ -710,7 +714,6 @@ static int hostfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
if (name == NULL)
goto out_put;
- init_special_inode(inode, mode, dev);
err = do_mknod(name, mode, MAJOR(dev), MINOR(dev));
if (err)
goto out_free;
@@ -731,7 +734,8 @@ static int hostfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
return err;
}
-static int hostfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
+static int hostfs_rename2(struct user_namespace *mnt_userns,
+ struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
@@ -759,7 +763,8 @@ static int hostfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
return err;
}
-static int hostfs_permission(struct inode *ino, int desired)
+static int hostfs_permission(struct user_namespace *mnt_userns,
+ struct inode *ino, int desired)
{
char *name;
int r = 0, w = 0, x = 0, err;
@@ -781,11 +786,12 @@ static int hostfs_permission(struct inode *ino, int desired)
err = access_file(name, r, w, x);
__putname(name);
if (!err)
- err = generic_permission(ino, desired);
+ err = generic_permission(&init_user_ns, ino, desired);
return err;
}
-static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
+static int hostfs_setattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
struct hostfs_iattr attrs;
@@ -794,7 +800,7 @@ static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
int fd = HOSTFS_I(inode)->fd;
- err = setattr_prepare(dentry, attr);
+ err = setattr_prepare(&init_user_ns, dentry, attr);
if (err)
return err;
@@ -851,7 +857,7 @@ static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
attr->ia_size != i_size_read(inode))
truncate_setsize(inode, attr->ia_size);
- setattr_copy(inode, attr);
+ setattr_copy(&init_user_ns, inode, attr);
mark_inode_dirty(inode);
return 0;
}
@@ -920,19 +926,20 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
sb->s_op = &hostfs_sbops;
sb->s_d_op = &simple_dentry_operations;
sb->s_maxbytes = MAX_LFS_FILESIZE;
+ err = super_setup_bdi(sb);
+ if (err)
+ goto out;
- /* NULL is printed as <NULL> by sprintf: avoid that. */
+ /* NULL is printed as '(null)' by printf(): avoid that. */
if (req_root == NULL)
req_root = "";
err = -ENOMEM;
sb->s_fs_info = host_root_path =
- kmalloc(strlen(root_ino) + strlen(req_root) + 2, GFP_KERNEL);
+ kasprintf(GFP_KERNEL, "%s/%s", root_ino, req_root);
if (host_root_path == NULL)
goto out;
- sprintf(host_root_path, "%s/%s", root_ino, req_root);
-
root_inode = new_inode(sb);
if (!root_inode)
goto out;
@@ -990,12 +997,16 @@ MODULE_ALIAS_FS("hostfs");
static int __init init_hostfs(void)
{
+ hostfs_inode_cache = KMEM_CACHE(hostfs_inode_info, 0);
+ if (!hostfs_inode_cache)
+ return -ENOMEM;
return register_filesystem(&hostfs_type);
}
static void __exit exit_hostfs(void)
{
unregister_filesystem(&hostfs_type);
+ kmem_cache_destroy(hostfs_inode_cache);
}
module_init(init_hostfs)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.