diff options
Diffstat (limited to '')
-rw-r--r-- | fs/hostfs/hostfs_kern.c | 85 |
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) |