diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c index bb6b29ce1d3a7f..fd57d8171c887c 100644 --- a/fs/ufs/dir.c +++ b/fs/ufs/dir.c @@ -61,9 +61,9 @@ static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len) return err; } -static inline void ufs_put_page(struct page *page) +static inline void ufs_put_page(struct page *page, void *page_addr) { - kunmap(page); + kunmap((void *)((unsigned long)page_addr & PAGE_MASK)); put_page(page); } @@ -76,7 +76,7 @@ ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr) de = ufs_find_entry(dir, qstr, &page); if (de) { res = fs32_to_cpu(dir->i_sb, de->d_ino); - ufs_put_page(page); + ufs_put_page(page, de); } return res; } @@ -99,18 +99,17 @@ void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de, ufs_set_de_type(dir->i_sb, de, inode->i_mode); err = ufs_commit_chunk(page, pos, len); - ufs_put_page(page); + ufs_put_page(page, de); if (update_times) dir->i_mtime = dir->i_ctime = current_time(dir); mark_inode_dirty(dir); } -static bool ufs_check_page(struct page *page) +static bool ufs_check_page(struct page *page, char *kaddr) { struct inode *dir = page->mapping->host; struct super_block *sb = dir->i_sb; - char *kaddr = page_address(page); unsigned offs, rec_len; unsigned limit = PAGE_SIZE; const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1; @@ -185,21 +184,30 @@ static bool ufs_check_page(struct page *page) return false; } +/* + * Calls to ufs_get_page()/ufs_put_page() must be nested according to the + * rules documented in kmap_local_page()/kunmap_local(). + * + * NOTE: ufs_find_entry() and ufs_dotdot() act as calls to ufs_get_page() + * and must be treated accordingly for nesting purposes. + */ static void *ufs_get_page(struct inode *dir, unsigned long n, struct page **page) { + char *kaddr; + struct address_space *mapping = dir->i_mapping; *page = read_mapping_page(mapping, n, NULL); if (!IS_ERR(*page)) { - kmap(*page); + kmap_local_page(*page); if (unlikely(!PageChecked(*page))) { - if (!ufs_check_page(*page)) + if (!ufs_check_page(*page, kaddr)) goto fail; } } - return page; + return *page; fail: - ufs_put_page(*page); + ufs_put_page(*page, kaddr); return ERR_PTR(-EIO); } @@ -225,6 +233,13 @@ ufs_next_entry(struct super_block *sb, struct ufs_dir_entry *p) fs16_to_cpu(sb, p->d_reclen)); } +/* + * Calls to ufs_get_page()/ufs_put_page() must be nested according to the + * rules documented in kmap_local_page()/kunmap_local(). + * + * ufs_dotdot() acts as a call to ufs_get_page() and must be treated + * accordingly for nesting purposes. + */ struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p) { struct ufs_dir_entry *de = ufs_get_page(dir, 0, p); @@ -236,12 +251,15 @@ struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct page **p) } /* - * ufs_find_entry() + * Finds an entry in the specified directory with the wanted name. It returns a + * pointer to the directory's entry. The page in which the entry was found is + * in the res_page out parameter. The page is returned mapped and unlocked. + * The entry is guaranteed to be valid. + * + * On Success ufs_put_page() should be called on *res_page. * - * finds an entry in the specified directory with the wanted name. It - * returns the page in which the entry was found, and the entry itself - * (as a parameter - res_dir). Page is returned mapped and unlocked. - * Entry is guaranteed to be valid. + * ufs_find_entry() acts as a call to ufs_get_page() and must be treated + * accordingly for nesting purposes. */ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr, struct page **res_page) @@ -280,7 +298,7 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, const struct qstr *qstr, goto found; de = ufs_next_entry(sb, de); } - ufs_put_page(page); + ufs_put_page(page, kaddr); } if (++n >= npages) n = 0; @@ -358,7 +376,7 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode) de = (struct ufs_dir_entry *) ((char *) de + rec_len); } unlock_page(page); - ufs_put_page(page); + ufs_put_page(page, kaddr); } BUG(); return -EINVAL; @@ -388,7 +406,8 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode) mark_inode_dirty(dir); /* OFFSET_CACHE */ out_put: - ufs_put_page(page); + ufs_put_page(page, kaddr); + return 0; out_unlock: unlock_page(page); goto out_put; @@ -465,13 +484,13 @@ ufs_readdir(struct file *file, struct dir_context *ctx) ufs_get_de_namlen(sb, de), fs32_to_cpu(sb, de->d_ino), d_type)) { - ufs_put_page(page); + ufs_put_page(page, kaddr); return 0; } } ctx->pos += fs16_to_cpu(sb, de->d_reclen); } - ufs_put_page(page); + ufs_put_page(page, kaddr); } return 0; } @@ -482,10 +501,10 @@ ufs_readdir(struct file *file, struct dir_context *ctx) * previous entry. */ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir, - struct page * page) + struct page *page) { struct super_block *sb = inode->i_sb; - char *kaddr = page_address(page); + char *kaddr = (char *)((unsigned long)dir & PAGE_MASK); unsigned int from = offset_in_page(dir) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1); unsigned int to = offset_in_page(dir) + fs16_to_cpu(sb, dir->d_reclen); loff_t pos; @@ -524,7 +543,7 @@ int ufs_delete_entry(struct inode *inode, struct ufs_dir_entry *dir, inode->i_ctime = inode->i_mtime = current_time(inode); mark_inode_dirty(inode); out: - ufs_put_page(page); + ufs_put_page(page, kaddr); UFSD("EXIT\n"); return err; } @@ -548,8 +567,7 @@ int ufs_make_empty(struct inode * inode, struct inode *dir) goto fail; } - kmap(page); - base = (char*)page_address(page); + base = kmap_local_page(page); memset(base, 0, PAGE_SIZE); de = (struct ufs_dir_entry *) base; @@ -566,7 +584,7 @@ int ufs_make_empty(struct inode * inode, struct inode *dir) de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1)); ufs_set_de_namlen(sb, de, 2); strcpy (de->d_name, ".."); - kunmap(page); + kunmap_local(base); err = ufs_commit_chunk(page, 0, chunk_size); fail: @@ -582,9 +600,9 @@ int ufs_empty_dir(struct inode * inode) struct super_block *sb = inode->i_sb; struct page *page = NULL; unsigned long i, npages = dir_pages(inode); + char *kaddr; for (i = 0; i < npages; i++) { - char *kaddr; struct ufs_dir_entry *de; kaddr = ufs_get_page(inode, i, &page); @@ -617,12 +635,12 @@ int ufs_empty_dir(struct inode * inode) } de = ufs_next_entry(sb, de); } - ufs_put_page(page); + ufs_put_page(page, kaddr); } return 1; not_empty: - ufs_put_page(page); + ufs_put_page(page, kaddr); return 0; }