pramfs: headers

new file mode 100644
index 0000000..85169c4
@@ -0,0 +1,269 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Definitions for the PRAMFS filesystem.
+ *
+ * Copyright 2009-2010 Marco Stornelli <[email protected]>
+ * Copyright 2003 Sony Corporation
+ * Copyright 2003 Matsushita Electric Industrial Co., Ltd.
+ * 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#ifndef __PRAM_H
+#define __PRAM_H
+
+#include <linux/buffer_head.h>
+#include <linux/pram_fs.h>
+#include <linux/pram_fs_sb.h>
+#include <linux/crc16.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include "wprotect.h"
+
+/*
+ * Debug code
+ */
+#ifdef pr_fmt
+#undef pr_fmt
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#endif
+
+#define pram_dbg(s, args...)		pr_debug(s, ## args)
+#define pram_err(sb, s, args...)	pram_error_mng(sb, s, ## args)
+#define pram_warn(s, args...)		pr_warning(s, ## args)
+#define pram_info(s, args...)		pr_info(s, ## args)
+
+#define pram_set_bit			ext2_set_bit
+#define pram_clear_bit			ext2_clear_bit
+#define pram_find_next_zero_bit		ext2_find_next_zero_bit
+
+#define clear_opt(o, opt)	(o &= ~PRAM_MOUNT_##opt)
+#define set_opt(o, opt)		(o |= PRAM_MOUNT_##opt)
+#define test_opt(sb, opt) \
+	(((struct pram_sb_info *)sb->s_fs_info)->s_mount_opt & PRAM_MOUNT_##opt)
+
+/*
+ * Pram inode flags
+ *
+ * PRAM_EOFBLOCKS_FL	There are blocks allocated beyond eof
+ */
+#define PRAM_EOFBLOCKS_FL	0x20000000
+/* Flags that should be inherited by new inodes from their parent. */
+#define PRAM_FL_INHERITED (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL |\
+			   FS_SYNC_FL | FS_IMMUTABLE_FL | FS_APPEND_FL |\
+			   FS_NODUMP_FL | FS_NOATIME_FL | FS_COMPRBLK_FL|\
+			   FS_NOCOMP_FL | FS_JOURNAL_DATA_FL |\
+			   FS_NOTAIL_FL | FS_DIRSYNC_FL)
+/* Flags that are appropriate for regular files (all but dir-specific ones). */
+#define PRAM_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
+/* Flags that are appropriate for non-directories/regular files. */
+#define PRAM_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
+
+/* Function Prototypes */
+extern void pram_error_mng(struct super_block * sb, const char * fmt, ...);
+extern int pram_get_and_update_block(struct inode *inode, sector_t iblock,
+				     struct buffer_head *bh, int create);
+
+static inline int pram_readpage(struct file *file, struct page *page)
+{
+	return block_read_full_page(page, pram_get_and_update_block);
+}
+
+/* file.c */
+extern ssize_t pram_direct_IO(int rw, struct kiocb *iocb,
+			  const struct iovec *iov,
+			  loff_t offset, unsigned long nr_segs);
+extern int pram_mmap(struct file *file, struct vm_area_struct *vma);
+
+/* balloc.c */
+extern void pram_init_bitmap(struct super_block *sb);
+extern void pram_free_block(struct super_block *sb, unsigned long blocknr);
+extern int pram_new_block(struct super_block *sb, unsigned long *blocknr, int zero);
+extern unsigned long pram_count_free_blocks(struct super_block *sb);
+
+/* dir.c */
+extern int pram_add_link(struct dentry *dentry, struct inode *inode);
+extern int pram_remove_link(struct inode *inode);
+
+/* namei.c */
+extern struct dentry *pram_get_parent(struct dentry *child);
+
+/* inode.c */
+extern int pram_alloc_blocks(struct inode *inode, int file_blocknr,
+			     				unsigned int num);
+extern u64 pram_find_data_block(struct inode *inode,
+					 unsigned long file_blocknr);
+
+extern struct inode *pram_iget(struct super_block *sb, unsigned long ino);
+extern void pram_put_inode(struct inode *inode);
+extern void pram_evict_inode(struct inode *inode);
+extern struct inode *pram_new_inode(struct inode *dir, int mode);
+extern int pram_update_inode(struct inode *inode);
+extern int pram_write_inode(struct inode *inode, struct writeback_control *wbc);
+extern void pram_dirty_inode(struct inode *inode);
+extern int pram_notify_change(struct dentry *dentry, struct iattr *attr);
+extern long pram_fallocate(struct inode *inode, int mode, loff_t offset,
+			  loff_t len);
+extern void pram_set_inode_flags(struct inode *inode, struct pram_inode *pi);
+extern void pram_get_inode_flags(struct inode *inode, struct pram_inode *pi);
+
+/* ioctl.c */
+extern long pram_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+extern long pram_compat_ioctl(struct file *file, unsigned int cmd,
+			      unsigned long arg);
+#endif
+
+/* super.c */
+#ifdef CONFIG_PRAMFS_TEST
+extern struct pram_super_block *get_pram_super(void);
+#endif
+extern struct super_block *pram_read_super(struct super_block *sb,
+					      void *data,
+					      int silent);
+extern int pram_statfs(struct dentry *d, struct kstatfs *buf);
+extern int pram_remount(struct super_block *sb, int *flags, char *data);
+
+/* symlink.c */
+extern int pram_block_symlink(struct inode *inode,
+			       const char *symname, int len);
+
+/* Inline functions start here */
+
+/* Mask out flags that are inappropriate for the given type of inode. */
+static inline __be32 pram_mask_flags(umode_t mode, __be32 flags)
+{
+	flags &= cpu_to_be32(PRAM_FL_INHERITED);
+	if (S_ISDIR(mode))
+		return flags;
+	else if (S_ISREG(mode))
+		return flags & cpu_to_be32(PRAM_REG_FLMASK);
+	else
+		return flags & cpu_to_be32(PRAM_OTHER_FLMASK);
+}
+
+static inline int pram_calc_checksum(u8 *data, int n)
+{
+	u16 crc = 0;
+	crc = crc16(~0, (__u8 *)data + sizeof(__be16), n - sizeof(__be16));
+	if (*((__be16 *)data) == cpu_to_be16(crc))
+		return 0;
+	else
+		return 1;
+}
+
+/* If this is part of a read-modify-write of the super block,
+   pram_memunlock_super() before calling! */
+static inline struct pram_super_block *
+pram_get_super(struct super_block *sb)
+{
+	struct pram_sb_info *sbi = (struct pram_sb_info *)sb->s_fs_info;
+	return (struct pram_super_block *)sbi->virt_addr;
+}
+
+static inline struct pram_super_block *
+pram_get_redund_super(struct super_block *sb)
+{
+	struct pram_sb_info *sbi = (struct pram_sb_info *)sb->s_fs_info;
+	return (struct pram_super_block *)(sbi->virt_addr + PRAM_SB_SIZE);
+}
+
+static inline void *
+pram_get_bitmap(struct super_block *sb)
+{
+	struct pram_super_block *ps = pram_get_super(sb);
+	return (void *)ps + be64_to_cpu(ps->s_bitmap_start);
+}
+
+/* If this is part of a read-modify-write of the inode metadata,
+   pram_memunlock_inode() before calling! */
+static inline struct pram_inode *
+pram_get_inode(struct super_block *sb, u64 ino)
+{
+	struct pram_super_block *ps = pram_get_super(sb);
+	return ino ? (struct pram_inode *)((void *)ps + ino) : NULL;
+}
+
+static inline ino_t
+pram_get_inodenr(struct super_block *sb, struct pram_inode *pi)
+{
+	struct pram_super_block *ps = pram_get_super(sb);
+	return (ino_t)((unsigned long)pi - (unsigned long)ps);
+}
+
+static inline u64
+pram_get_block_off(struct super_block *sb, unsigned long blocknr)
+{
+	struct pram_super_block *ps = pram_get_super(sb);
+	return (u64)(be64_to_cpu(ps->s_bitmap_start) +
+			     (blocknr << sb->s_blocksize_bits));
+}
+
+static inline unsigned long
+pram_get_blocknr(struct super_block *sb, u64 block)
+{
+	struct pram_super_block *ps = pram_get_super(sb);
+	return (block - be64_to_cpu(ps->s_bitmap_start)) >> sb->s_blocksize_bits;
+}
+
+/* If this is part of a read-modify-write of the block,
+   pram_memunlock_block() before calling! */
+static inline void *
+pram_get_block(struct super_block *sb, u64 block)
+{
+	struct pram_super_block *ps = pram_get_super(sb);
+	return block ? ((void *)ps + block) : NULL;
+}
+
+struct pram_inode_vfs {
+#ifdef CONFIG_PRAMFS_XATTR
+	/*
+	 * Extended attributes can be read independently of the main file
+	 * data. Taking i_mutex even when reading would cause contention
+	 * between readers of EAs and writers of regular file data, so
+	 * instead we synchronize on xattr_sem when reading or changing
+	 * EAs.
+	 */
+	struct rw_semaphore xattr_sem;
+#endif
+	/*
+	 * truncate_mutex is for serialising the truncate path against
+	 * get/update block.
+	 */
+	struct mutex truncate_mutex;
+	struct mutex i_meta_mutex;
+	struct inode vfs_inode;
+};
+
+static inline struct pram_inode_vfs *PRAM_I(struct inode *inode)
+{
+	return container_of(inode, struct pram_inode_vfs, vfs_inode);
+}
+
+/*
+ * Inodes and files operations
+ */
+
+/* dir.c */
+extern struct file_operations pram_dir_operations;
+
+/* file.c */
+extern struct inode_operations pram_file_inode_operations;
+extern struct file_operations pram_file_operations;
+extern struct file_operations pram_xip_file_operations;
+
+/* inode.c */
+extern struct address_space_operations pram_aops;
+extern struct address_space_operations pram_aops_xip;
+
+/* namei.c */
+extern struct inode_operations pram_dir_inode_operations;
+
+/* symlink.c */
+extern struct inode_operations pram_symlink_inode_operations;
+
+extern struct backing_dev_info pram_backing_dev_info;
+
+#endif	/* __PRAM_H */

index ff690d0..4cb2e9b 100644
@@ -38,6 +38,7 @@
 #define NFS_SUPER_MAGIC		0x6969
 #define OPENPROM_SUPER_MAGIC	0x9fa1
 #define PROC_SUPER_MAGIC	0x9fa0
+#define PRAM_SUPER_MAGIC	0xEFFA
 #define QNX4_SUPER_MAGIC	0x002f		/* qnx4 fs detection */
  #define REISERFS_SUPER_MAGIC	0x52654973	/* used by gcc */

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