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Subject[PATCH 08/17] pramfs: headers
From: Marco Stornelli <marco.stornelli@gmail.com>

Definitions for the PRAMFS filesystem.

Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>
---
diff --git a/fs/pramfs/pram.h b/fs/pramfs/pram.h
new file mode 100644
index 0000000..85169c4
--- /dev/null
+++ b/fs/pramfs/pram.h
@@ -0,0 +1,269 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Definitions for the PRAMFS filesystem.
+ *
+ * Copyright 2009-2010 Marco Stornelli <marco.stornelli@gmail.com>
+ * 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 */
diff --git a/include/linux/magic.h b/include/linux/magic.h
index ff690d0..4cb2e9b 100644
--- a/include/linux/magic.h
+++ b/include/linux/magic.h
@@ -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 */
diff --git a/include/linux/pram_fs.h b/include/linux/pram_fs.h
new file mode 100644
index 0000000..ced52f4
--- /dev/null
+++ b/include/linux/pram_fs.h
@@ -0,0 +1,130 @@
+/*
+ * FILE NAME include/linux/pram_fs.h
+ *
+ * BRIEF DESCRIPTION
+ *
+ * Definitions for the PRAMFS filesystem.
+ *
+ * Copyright 2009-2010 Marco Stornelli <marco.stornelli@gmail.com>
+ * 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 _LINUX_PRAM_FS_H
+#define _LINUX_PRAM_FS_H
+
+#include <linux/types.h>
+#include <linux/magic.h>
+
+/*
+ * The PRAM filesystem constants/structures
+ */
+
+/*
+ * Mount flags
+ */
+#define PRAM_MOUNT_PROTECT 0x000001 /* Use memory protection */
+#define PRAM_MOUNT_XATTR_USER 0x000002 /* Extended user attributes */
+#define PRAM_MOUNT_POSIX_ACL 0x000004 /* POSIX Access Control Lists */
+#define PRAM_MOUNT_XIP 0x000008 /* Execute in place */
+#define PRAM_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
+#define PRAM_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
+#define PRAM_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
+
+/*
+ * Maximal count of links to a file
+ */
+#define PRAM_LINK_MAX 32000
+
+#define PRAM_MIN_BLOCK_SIZE 512
+#define PRAM_MAX_BLOCK_SIZE 4096
+#define PRAM_DEF_BLOCK_SIZE 2048
+
+#define PRAM_INODE_SIZE 128 /* must be power of two */
+#define PRAM_INODE_BITS 7
+
+/*
+ * Structure of a directory entry in PRAMFS.
+ * Offsets are to the inode that holds the referenced dentry.
+ */
+struct pram_dentry {
+ __be64 d_next; /* next dentry in this directory */
+ __be64 d_prev; /* previous dentry in this directory */
+ __be64 d_parent; /* parent directory */
+ char d_name[0];
+};
+
+
+/*
+ * Structure of an inode in PRAMFS
+ */
+struct pram_inode {
+ __be16 i_sum; /* checksum of this inode */
+ __be32 i_uid; /* Owner Uid */
+ __be32 i_gid; /* Group Id */
+ __be16 i_mode; /* File mode */
+ __be16 i_links_count; /* Links count */
+ __be32 i_blocks; /* Blocks count */
+ __be32 i_size; /* Size of data in bytes */
+ __be32 i_atime; /* Access time */
+ __be32 i_ctime; /* Creation time */
+ __be32 i_mtime; /* Modification time */
+ __be32 i_dtime; /* Deletion Time */
+ __be64 i_xattr; /* Extended attribute block */
+ __be32 i_generation; /* File version (for NFS) */
+ __be32 i_flags; /* Inode flags */
+
+ union {
+ struct {
+ /*
+ * ptr to row block of 2D block pointer array,
+ * file block #'s 0 to (blocksize/8)^2 - 1.
+ */
+ __be64 row_block;
+ } reg; /* regular file or symlink inode */
+ struct {
+ __be64 head; /* first entry in this directory */
+ __be64 tail; /* last entry in this directory */
+ } dir;
+ struct {
+ __be32 rdev; /* major/minor # */
+ } dev; /* device inode */
+ } i_type;
+
+ struct pram_dentry i_d;
+};
+
+#define PRAM_NAME_LEN \
+ (PRAM_INODE_SIZE - offsetof(struct pram_inode, i_d.d_name) - 1)
+
+
+#define PRAM_SB_SIZE 128 /* must be power of two */
+
+/*
+ * Structure of the super block in PRAMFS
+ */
+struct pram_super_block {
+ __be16 s_sum; /* checksum of this sb, including padding */
+ __be64 s_size; /* total size of fs in bytes */
+ __be32 s_blocksize; /* blocksize in bytes */
+ __be32 s_inodes_count; /* total inodes count (used or free) */
+ __be32 s_free_inodes_count;/* free inodes count */
+ __be32 s_free_inode_hint; /* start hint for locating free inodes */
+ __be32 s_blocks_count; /* total data blocks count (used or free) */
+ __be32 s_free_blocks_count;/* free data blocks count */
+ __be32 s_free_blocknr_hint;/* free data blocks count */
+ __be64 s_bitmap_start; /* data block in-use bitmap location */
+ __be32 s_bitmap_blocks;/* size of bitmap in number of blocks */
+ __be32 s_mtime; /* Mount time */
+ __be32 s_wtime; /* Write time */
+ __be16 s_magic; /* Magic signature */
+ char s_volume_name[16]; /* volume name */
+};
+
+/* The root inode follows immediately after the redundant super block */
+#define PRAM_ROOT_INO (PRAM_SB_SIZE*2)
+
+#endif /* _LINUX_PRAM_FS_H */
diff --git a/include/linux/pram_fs_sb.h b/include/linux/pram_fs_sb.h
new file mode 100644
index 0000000..0306269
--- /dev/null
+++ b/include/linux/pram_fs_sb.h
@@ -0,0 +1,45 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Definitions for the PRAM filesystem.
+ *
+ * Copyright 2009-2010 Marco Stornelli <marco.stornelli@gmail.com>
+ * 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 _LINUX_PRAM_FS_SB
+#define _LINUX_PRAM_FS_SB
+
+/*
+ * PRAM filesystem super-block data in memory
+ */
+struct pram_sb_info {
+ /*
+ * base physical and virtual address of PRAMFS (which is also
+ * the pointer to the super block)
+ */
+ phys_addr_t phys_addr;
+ void *virt_addr;
+
+ /* Mount options */
+ unsigned long bpi;
+ unsigned long num_inodes;
+ unsigned long blocksize;
+ unsigned long initsize;
+ unsigned long s_mount_opt;
+ uid_t uid; /* Mount uid for root directory */
+ gid_t gid; /* Mount gid for root directory */
+ mode_t mode; /* Mount mode for root directory */
+ atomic_t next_generation;
+#ifdef CONFIG_PRAMFS_XATTR
+ struct rb_root desc_tree;
+ spinlock_t desc_tree_lock;
+#endif
+};
+
+#endif /* _LINUX_PRAM_FS_SB */

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