Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 245 insertions, 0 deletions

diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h
new file mode 100644
index 0000000000..e3f988b469
--- /dev/null
+++ b/fs/sysv/sysv.h
@@ -0,0 +1,245 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SYSV_H
+#define _SYSV_H
+
+#include <linux/buffer_head.h>
+
+typedef __u16 __bitwise __fs16;
+typedef __u32 __bitwise __fs32;
+
+#include <linux/sysv_fs.h>
+
+/*
+ * SystemV/V7/Coherent super-block data in memory
+ *
+ * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
+ * while the system is running). This is in contrast to the Minix and Berkeley
+ * filesystems (where the superblock is never modified). This affects the
+ * sync() operation: we must keep the superblock in a disk buffer and use this
+ * one as our "working copy".
+ */
+
+struct sysv_sb_info {
+	struct super_block *s_sb;	/* VFS superblock */
+	int	       s_type;		/* file system type: FSTYPE_{XENIX|SYSV|COH} */
+	char	       s_bytesex;	/* bytesex (le/be/pdp) */
+	unsigned int   s_inodes_per_block;	/* number of inodes per block */
+	unsigned int   s_inodes_per_block_1;	/* inodes_per_block - 1 */
+	unsigned int   s_inodes_per_block_bits;	/* log2(inodes_per_block) */
+	unsigned int   s_ind_per_block;		/* number of indirections per block */
+	unsigned int   s_ind_per_block_bits;	/* log2(ind_per_block) */
+	unsigned int   s_ind_per_block_2;	/* ind_per_block ^ 2 */
+	unsigned int   s_toobig_block;		/* 10 + ipb + ipb^2 + ipb^3 */
+	unsigned int   s_block_base;	/* physical block number of block 0 */
+	unsigned short s_fic_size;	/* free inode cache size, NICINOD */
+	unsigned short s_flc_size;	/* free block list chunk size, NICFREE */
+	/* The superblock is kept in one or two disk buffers: */
+	struct buffer_head *s_bh1;
+	struct buffer_head *s_bh2;
+	/* These are pointers into the disk buffer, to compensate for
+	   different superblock layout. */
+	char *         s_sbd1;		/* entire superblock data, for part 1 */
+	char *         s_sbd2;		/* entire superblock data, for part 2 */
+	__fs16         *s_sb_fic_count;	/* pointer to s_sbd->s_ninode */
+        sysv_ino_t     *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
+	__fs16         *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
+	__fs16         *s_bcache_count;	/* pointer to s_sbd->s_nfree */
+	sysv_zone_t    *s_bcache;	/* pointer to s_sbd->s_free */
+	__fs32         *s_free_blocks;	/* pointer to s_sbd->s_tfree */
+	__fs32         *s_sb_time;	/* pointer to s_sbd->s_time */
+	__fs32         *s_sb_state;	/* pointer to s_sbd->s_state, only FSTYPE_SYSV */
+	/* We keep those superblock entities that don't change here;
+	   this saves us an indirection and perhaps a conversion. */
+	u32            s_firstinodezone; /* index of first inode zone */
+	u32            s_firstdatazone;	/* same as s_sbd->s_isize */
+	u32            s_ninodes;	/* total number of inodes */
+	u32            s_ndatazones;	/* total number of data zones */
+	u32            s_nzones;	/* same as s_sbd->s_fsize */
+	u16	       s_namelen;       /* max length of dir entry */
+	int	       s_forced_ro;
+	struct mutex s_lock;
+};
+
+/*
+ * SystemV/V7/Coherent FS inode data in memory
+ */
+struct sysv_inode_info {
+	__fs32		i_data[13];
+	u32		i_dir_start_lookup;
+	struct inode	vfs_inode;
+};
+
+
+static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
+{
+	return container_of(inode, struct sysv_inode_info, vfs_inode);
+}
+
+static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
+
+/* identify the FS in memory */
+enum {
+	FSTYPE_NONE = 0,
+	FSTYPE_XENIX,
+	FSTYPE_SYSV4,
+	FSTYPE_SYSV2,
+	FSTYPE_COH,
+	FSTYPE_V7,
+	FSTYPE_AFS,
+	FSTYPE_END,
+};
+
+#define SYSV_MAGIC_BASE		0x012FF7B3
+
+#define XENIX_SUPER_MAGIC	(SYSV_MAGIC_BASE+FSTYPE_XENIX)
+#define SYSV4_SUPER_MAGIC	(SYSV_MAGIC_BASE+FSTYPE_SYSV4)
+#define SYSV2_SUPER_MAGIC	(SYSV_MAGIC_BASE+FSTYPE_SYSV2)
+#define COH_SUPER_MAGIC		(SYSV_MAGIC_BASE+FSTYPE_COH)
+
+
+/* Admissible values for i_nlink: 0.._LINK_MAX */
+enum {
+	XENIX_LINK_MAX	=	126,	/* ?? */
+	SYSV_LINK_MAX	=	126,	/* 127? 251? */
+	V7_LINK_MAX     =	126,	/* ?? */
+	COH_LINK_MAX	=	10000,
+};
+
+
+static inline void dirty_sb(struct super_block *sb)
+{
+	struct sysv_sb_info *sbi = SYSV_SB(sb);
+
+	mark_buffer_dirty(sbi->s_bh1);
+	if (sbi->s_bh1 != sbi->s_bh2)
+		mark_buffer_dirty(sbi->s_bh2);
+}
+
+
+/* ialloc.c */
+extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
+			struct buffer_head **);
+extern struct inode * sysv_new_inode(const struct inode *, umode_t);
+extern void sysv_free_inode(struct inode *);
+extern unsigned long sysv_count_free_inodes(struct super_block *);
+
+/* balloc.c */
+extern sysv_zone_t sysv_new_block(struct super_block *);
+extern void sysv_free_block(struct super_block *, sysv_zone_t);
+extern unsigned long sysv_count_free_blocks(struct super_block *);
+
+/* itree.c */
+extern void sysv_truncate(struct inode *);
+extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len);
+
+/* inode.c */
+extern struct inode *sysv_iget(struct super_block *, unsigned int);
+extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
+extern int sysv_sync_inode(struct inode *);
+extern void sysv_set_inode(struct inode *, dev_t);
+extern int sysv_getattr(struct mnt_idmap *, const struct path *,
+			struct kstat *, u32, unsigned int);
+extern int sysv_init_icache(void);
+extern void sysv_destroy_icache(void);
+
+
+/* dir.c */
+extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
+extern int sysv_add_link(struct dentry *, struct inode *);
+extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
+extern int sysv_make_empty(struct inode *, struct inode *);
+extern int sysv_empty_dir(struct inode *);
+extern int sysv_set_link(struct sysv_dir_entry *, struct page *,
+			struct inode *);
+extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
+extern ino_t sysv_inode_by_name(struct dentry *);
+
+
+extern const struct inode_operations sysv_file_inode_operations;
+extern const struct inode_operations sysv_dir_inode_operations;
+extern const struct file_operations sysv_file_operations;
+extern const struct file_operations sysv_dir_operations;
+extern const struct address_space_operations sysv_aops;
+extern const struct super_operations sysv_sops;
+
+
+enum {
+	BYTESEX_LE,
+	BYTESEX_PDP,
+	BYTESEX_BE,
+};
+
+static inline u32 PDP_swab(u32 x)
+{
+#ifdef __LITTLE_ENDIAN
+	return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
+#else
+#ifdef __BIG_ENDIAN
+	return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
+#else
+#error BYTESEX
+#endif
+#endif
+}
+
+static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
+{
+	if (sbi->s_bytesex == BYTESEX_PDP)
+		return PDP_swab((__force __u32)n);
+	else if (sbi->s_bytesex == BYTESEX_LE)
+		return le32_to_cpu((__force __le32)n);
+	else
+		return be32_to_cpu((__force __be32)n);
+}
+
+static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
+{
+	if (sbi->s_bytesex == BYTESEX_PDP)
+		return (__force __fs32)PDP_swab(n);
+	else if (sbi->s_bytesex == BYTESEX_LE)
+		return (__force __fs32)cpu_to_le32(n);
+	else
+		return (__force __fs32)cpu_to_be32(n);
+}
+
+static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
+{
+	if (sbi->s_bytesex == BYTESEX_PDP)
+		*(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
+	else if (sbi->s_bytesex == BYTESEX_LE)
+		le32_add_cpu((__le32 *)n, d);
+	else
+		be32_add_cpu((__be32 *)n, d);
+	return *n;
+}
+
+static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
+{
+	if (sbi->s_bytesex != BYTESEX_BE)
+		return le16_to_cpu((__force __le16)n);
+	else
+		return be16_to_cpu((__force __be16)n);
+}
+
+static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
+{
+	if (sbi->s_bytesex != BYTESEX_BE)
+		return (__force __fs16)cpu_to_le16(n);
+	else
+		return (__force __fs16)cpu_to_be16(n);
+}
+
+static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
+{
+	if (sbi->s_bytesex != BYTESEX_BE)
+		le16_add_cpu((__le16 *)n, d);
+	else
+		be16_add_cpu((__be16 *)n, d);
+	return *n;
+}
+
+#endif /* _SYSV_H */