mirror of https://gitee.com/openkylin/linux.git
510 lines
14 KiB
C
510 lines
14 KiB
C
/*
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* linux/fs/ufs/util.h
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*
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* Copyright (C) 1998
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* Daniel Pirkl <daniel.pirkl@email.cz>
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* Charles University, Faculty of Mathematics and Physics
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*/
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#include <linux/buffer_head.h>
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#include <linux/fs.h>
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#include "swab.h"
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/*
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* some useful macros
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*/
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#define in_range(b,first,len) ((b)>=(first)&&(b)<(first)+(len))
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/*
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* functions used for retyping
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*/
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static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
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{
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return &cpi->c_ubh;
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}
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static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
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{
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return &spi->s_ubh;
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}
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/*
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* macros used for accessing structures
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*/
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static inline s32
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ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
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struct ufs_super_block_third *usb3)
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{
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switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
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case UFS_ST_SUN:
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return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state);
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case UFS_ST_SUNx86:
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return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
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case UFS_ST_44BSD:
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default:
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return fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_state);
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}
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}
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static inline void
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ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
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struct ufs_super_block_third *usb3, s32 value)
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{
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switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
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case UFS_ST_SUN:
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usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value);
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break;
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case UFS_ST_SUNx86:
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usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
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break;
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case UFS_ST_44BSD:
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usb3->fs_un2.fs_44.fs_state = cpu_to_fs32(sb, value);
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break;
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}
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}
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static inline u32
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ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
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struct ufs_super_block_third *usb3)
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{
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if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
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return fs32_to_cpu(sb, usb3->fs_un2.fs_sunx86.fs_npsect);
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else
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return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
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}
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static inline u64
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ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
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{
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__fs64 tmp;
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switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
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case UFS_ST_SUN:
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((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0];
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((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1];
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break;
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case UFS_ST_SUNx86:
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((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0];
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((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1];
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break;
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case UFS_ST_44BSD:
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((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0];
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((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qbmask[1];
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break;
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}
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return fs64_to_cpu(sb, tmp);
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}
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static inline u64
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ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
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{
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__fs64 tmp;
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switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
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case UFS_ST_SUN:
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((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0];
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((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1];
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break;
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case UFS_ST_SUNx86:
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((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0];
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((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1];
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break;
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case UFS_ST_44BSD:
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((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0];
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((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qfmask[1];
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break;
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}
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return fs64_to_cpu(sb, tmp);
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}
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static inline u16
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ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
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{
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if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
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return fs16_to_cpu(sb, de->d_u.d_namlen);
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else
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return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
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}
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static inline void
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ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
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{
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if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
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de->d_u.d_namlen = cpu_to_fs16(sb, value);
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else
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de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
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}
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static inline void
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ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
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{
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if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
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return;
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/*
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* TODO turn this into a table lookup
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*/
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switch (mode & S_IFMT) {
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case S_IFSOCK:
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de->d_u.d_44.d_type = DT_SOCK;
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break;
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case S_IFLNK:
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de->d_u.d_44.d_type = DT_LNK;
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break;
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case S_IFREG:
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de->d_u.d_44.d_type = DT_REG;
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break;
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case S_IFBLK:
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de->d_u.d_44.d_type = DT_BLK;
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break;
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case S_IFDIR:
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de->d_u.d_44.d_type = DT_DIR;
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break;
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case S_IFCHR:
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de->d_u.d_44.d_type = DT_CHR;
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break;
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case S_IFIFO:
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de->d_u.d_44.d_type = DT_FIFO;
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break;
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default:
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de->d_u.d_44.d_type = DT_UNKNOWN;
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}
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}
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static inline u32
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ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
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{
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switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
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case UFS_UID_EFT:
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return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
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case UFS_UID_44BSD:
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return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
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default:
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return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
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}
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}
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static inline void
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ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
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{
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switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
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case UFS_UID_EFT:
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inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
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break;
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case UFS_UID_44BSD:
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inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
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break;
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}
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inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
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}
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static inline u32
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ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
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{
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switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
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case UFS_UID_EFT:
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return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
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case UFS_UID_44BSD:
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return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
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default:
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return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
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}
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}
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static inline void
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ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
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{
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switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
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case UFS_UID_EFT:
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inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
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break;
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case UFS_UID_44BSD:
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inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
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break;
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}
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inode->ui_u1.oldids.ui_sgid = cpu_to_fs16(sb, value);
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}
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extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
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extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
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/*
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* These functions manipulate ufs buffers
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*/
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#define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)
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extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
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extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
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extern void ubh_brelse (struct ufs_buffer_head *);
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extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
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extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
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extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
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extern void ubh_ll_rw_block(int, struct ufs_buffer_head *);
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extern void ubh_wait_on_buffer (struct ufs_buffer_head *);
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extern void ubh_bforget (struct ufs_buffer_head *);
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extern int ubh_buffer_dirty (struct ufs_buffer_head *);
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#define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
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extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
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#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
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extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
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/* This functions works with cache pages*/
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extern struct page *ufs_get_locked_page(struct address_space *mapping,
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pgoff_t index);
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static inline void ufs_put_locked_page(struct page *page)
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{
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unlock_page(page);
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page_cache_release(page);
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}
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/*
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* macros and inline function to get important structures from ufs_sb_private_info
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*/
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static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
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unsigned int offset)
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{
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unsigned int index;
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index = offset >> uspi->s_fshift;
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offset &= ~uspi->s_fmask;
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return uspi->s_ubh.bh[index]->b_data + offset;
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}
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#define ubh_get_usb_first(uspi) \
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((struct ufs_super_block_first *)get_usb_offset((uspi), 0))
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#define ubh_get_usb_second(uspi) \
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((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE))
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#define ubh_get_usb_third(uspi) \
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((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE))
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#define ubh_get_ucg(ubh) \
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((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
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/*
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* Extract byte from ufs_buffer_head
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* Extract the bits for a block from a map inside ufs_buffer_head
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*/
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#define ubh_get_addr8(ubh,begin) \
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((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
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((begin) & ~uspi->s_fmask))
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#define ubh_get_addr16(ubh,begin) \
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(((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
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((begin) & ((uspi->fsize>>1) - 1)))
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#define ubh_get_addr32(ubh,begin) \
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(((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
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((begin) & ((uspi->s_fsize>>2) - 1)))
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#define ubh_get_addr ubh_get_addr8
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#define ubh_blkmap(ubh,begin,bit) \
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((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
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/*
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* Determine the number of available frags given a
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* percentage to hold in reserve.
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*/
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static inline u64
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ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved)
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{
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return ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
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uspi->cs_total.cs_nffree -
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(uspi->s_dsize * (percentreserved) / 100);
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}
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/*
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* Macros to access cylinder group array structures
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*/
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#define ubh_cg_blktot(ucpi,cylno) \
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(*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2))))
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#define ubh_cg_blks(ucpi,cylno,rpos) \
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(*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
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(ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
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/*
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* Bitmap operations
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* These functions work like classical bitmap operations.
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* The difference is that we don't have the whole bitmap
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* in one contiguous chunk of memory, but in several buffers.
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* The parameters of each function are super_block, ufs_buffer_head and
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* position of the beginning of the bitmap.
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*/
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#define ubh_setbit(ubh,begin,bit) \
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(*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
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#define ubh_clrbit(ubh,begin,bit) \
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(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
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#define ubh_isset(ubh,begin,bit) \
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(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
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#define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
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#define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
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#define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
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static inline unsigned _ubh_find_next_zero_bit_(
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struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
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unsigned begin, unsigned size, unsigned offset)
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{
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unsigned base, count, pos;
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size -= offset;
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begin <<= 3;
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offset += begin;
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base = offset >> uspi->s_bpfshift;
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offset &= uspi->s_bpfmask;
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for (;;) {
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count = min_t(unsigned int, size + offset, uspi->s_bpf);
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size -= count - offset;
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pos = ext2_find_next_zero_bit (ubh->bh[base]->b_data, count, offset);
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if (pos < count || !size)
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break;
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base++;
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offset = 0;
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}
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return (base << uspi->s_bpfshift) + pos - begin;
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}
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static inline unsigned find_last_zero_bit (unsigned char * bitmap,
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unsigned size, unsigned offset)
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{
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unsigned bit, i;
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unsigned char * mapp;
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unsigned char map;
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mapp = bitmap + (size >> 3);
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map = *mapp--;
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bit = 1 << (size & 7);
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for (i = size; i > offset; i--) {
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if ((map & bit) == 0)
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break;
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if ((i & 7) != 0) {
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bit >>= 1;
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} else {
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map = *mapp--;
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bit = 1 << 7;
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}
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}
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return i;
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}
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#define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
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static inline unsigned _ubh_find_last_zero_bit_(
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struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
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unsigned begin, unsigned start, unsigned end)
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{
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unsigned base, count, pos, size;
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size = start - end;
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begin <<= 3;
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start += begin;
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base = start >> uspi->s_bpfshift;
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start &= uspi->s_bpfmask;
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for (;;) {
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count = min_t(unsigned int,
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size + (uspi->s_bpf - start), uspi->s_bpf)
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- (uspi->s_bpf - start);
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size -= count;
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pos = find_last_zero_bit (ubh->bh[base]->b_data,
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start, start - count);
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if (pos > start - count || !size)
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break;
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base--;
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start = uspi->s_bpf;
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}
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return (base << uspi->s_bpfshift) + pos - begin;
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}
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#define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
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#define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
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static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
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struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
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{
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switch (uspi->s_fpb) {
|
|
case 8:
|
|
return (*ubh_get_addr (ubh, begin + block) == 0xff);
|
|
case 4:
|
|
return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
|
|
case 2:
|
|
return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
|
|
case 1:
|
|
return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
|
|
static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
|
|
struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
|
|
{
|
|
switch (uspi->s_fpb) {
|
|
case 8:
|
|
*ubh_get_addr (ubh, begin + block) = 0x00;
|
|
return;
|
|
case 4:
|
|
*ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
|
|
return;
|
|
case 2:
|
|
*ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
|
|
return;
|
|
case 1:
|
|
*ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
|
|
return;
|
|
}
|
|
}
|
|
|
|
#define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
|
|
static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
|
|
struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
|
|
{
|
|
switch (uspi->s_fpb) {
|
|
case 8:
|
|
*ubh_get_addr(ubh, begin + block) = 0xff;
|
|
return;
|
|
case 4:
|
|
*ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
|
|
return;
|
|
case 2:
|
|
*ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
|
|
return;
|
|
case 1:
|
|
*ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
|
|
return;
|
|
}
|
|
}
|
|
|
|
static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
|
|
__fs32 * fraglist, int cnt)
|
|
{
|
|
struct ufs_sb_private_info * uspi;
|
|
unsigned fragsize, pos;
|
|
|
|
uspi = UFS_SB(sb)->s_uspi;
|
|
|
|
fragsize = 0;
|
|
for (pos = 0; pos < uspi->s_fpb; pos++) {
|
|
if (blockmap & (1 << pos)) {
|
|
fragsize++;
|
|
}
|
|
else if (fragsize > 0) {
|
|
fs32_add(sb, &fraglist[fragsize], cnt);
|
|
fragsize = 0;
|
|
}
|
|
}
|
|
if (fragsize > 0 && fragsize < uspi->s_fpb)
|
|
fs32_add(sb, &fraglist[fragsize], cnt);
|
|
}
|