forked from luck/tmp_suning_uos_patched
5d026c7242
Adds support for qnx6fs readonly support to the linux kernel. * Mount option The option mmi_fs can be used to mount Harman Becker/Audi MMI 3G HDD qnx6fs filesystems. * Documentation A high level filesystem stucture description can be found in the Documentation/filesystems directory. (qnx6.txt) * Additional features - Active (stable) superblock selection - Superblock checksum check (enforced) - Supports mount of qnx6 filesystems with to host different endianess - Automatic endianess detection - Longfilename support (with non-enfocing crc check) - All blocksizes (512, 1024, 2048 and 4096 supported) Signed-off-by: Kai Bankett <chaosman@ontika.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*
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* QNX6 file system, Linux implementation.
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*
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* Version : 1.0.0
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*
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* History :
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*
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* 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
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* 16-02-2012 page map extension by Al Viro
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*
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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typedef __u16 __bitwise __fs16;
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typedef __u32 __bitwise __fs32;
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typedef __u64 __bitwise __fs64;
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#include <linux/qnx6_fs.h>
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#ifdef CONFIG_QNX6FS_DEBUG
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#define QNX6DEBUG(X) printk X
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#else
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#define QNX6DEBUG(X) (void) 0
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#endif
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struct qnx6_sb_info {
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struct buffer_head *sb_buf; /* superblock buffer */
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struct qnx6_super_block *sb; /* our superblock */
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int s_blks_off; /* blkoffset fs-startpoint */
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int s_ptrbits; /* indirect pointer bitfield */
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unsigned long s_mount_opt; /* all mount options */
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int s_bytesex; /* holds endianess info */
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struct inode * inodes;
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struct inode * longfile;
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};
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struct qnx6_inode_info {
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__fs32 di_block_ptr[QNX6_NO_DIRECT_POINTERS];
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__u8 di_filelevels;
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__u32 i_dir_start_lookup;
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struct inode vfs_inode;
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};
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extern struct inode *qnx6_iget(struct super_block *sb, unsigned ino);
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extern struct dentry *qnx6_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd);
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#ifdef CONFIG_QNX6FS_DEBUG
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extern void qnx6_superblock_debug(struct qnx6_super_block *,
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struct super_block *);
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#endif
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extern const struct inode_operations qnx6_dir_inode_operations;
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extern const struct file_operations qnx6_dir_operations;
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static inline struct qnx6_sb_info *QNX6_SB(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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static inline struct qnx6_inode_info *QNX6_I(struct inode *inode)
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{
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return container_of(inode, struct qnx6_inode_info, vfs_inode);
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}
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#define clear_opt(o, opt) (o &= ~(QNX6_MOUNT_##opt))
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#define set_opt(o, opt) (o |= (QNX6_MOUNT_##opt))
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#define test_opt(sb, opt) (QNX6_SB(sb)->s_mount_opt & \
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QNX6_MOUNT_##opt)
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enum {
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BYTESEX_LE,
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BYTESEX_BE,
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};
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static inline __u64 fs64_to_cpu(struct qnx6_sb_info *sbi, __fs64 n)
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{
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if (sbi->s_bytesex == BYTESEX_LE)
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return le64_to_cpu((__force __le64)n);
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else
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return be64_to_cpu((__force __be64)n);
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}
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static inline __fs64 cpu_to_fs64(struct qnx6_sb_info *sbi, __u64 n)
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{
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if (sbi->s_bytesex == BYTESEX_LE)
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return (__force __fs64)cpu_to_le64(n);
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else
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return (__force __fs64)cpu_to_be64(n);
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}
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static inline __u32 fs32_to_cpu(struct qnx6_sb_info *sbi, __fs32 n)
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{
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if (sbi->s_bytesex == BYTESEX_LE)
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return le32_to_cpu((__force __le32)n);
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else
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return be32_to_cpu((__force __be32)n);
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}
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static inline __fs32 cpu_to_fs32(struct qnx6_sb_info *sbi, __u32 n)
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{
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if (sbi->s_bytesex == BYTESEX_LE)
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return (__force __fs32)cpu_to_le32(n);
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else
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return (__force __fs32)cpu_to_be32(n);
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}
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static inline __u16 fs16_to_cpu(struct qnx6_sb_info *sbi, __fs16 n)
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{
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if (sbi->s_bytesex == BYTESEX_LE)
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return le16_to_cpu((__force __le16)n);
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else
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return be16_to_cpu((__force __be16)n);
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}
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static inline __fs16 cpu_to_fs16(struct qnx6_sb_info *sbi, __u16 n)
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{
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if (sbi->s_bytesex == BYTESEX_LE)
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return (__force __fs16)cpu_to_le16(n);
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else
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return (__force __fs16)cpu_to_be16(n);
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}
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extern struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s,
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int silent);
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static inline void qnx6_put_page(struct page *page)
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{
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kunmap(page);
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page_cache_release(page);
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}
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extern unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
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struct page **res_page);
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