add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/ext2/ext2.h
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@@ -52,8 +52,8 @@
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 	/*
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 	 * Was i_next_alloc_goal in ext2_inode_info
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 	 * is the *physical* companion to i_next_alloc_block.
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-	 * it the the physical block number of the block which was most-recentl
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-	 * allocated to this file.  This give us the goal (target) for the next
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+	 * it is the physical block number of the block which was most-recently
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+	 * allocated to this file.  This gives us the goal (target) for the next
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 	 * allocation when we detect linearly ascending requests.
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 	 */
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 	ext2_fsblk_t		last_alloc_physical_block;
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@@ -68,10 +68,7 @@
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  * second extended-fs super-block data in memory
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  */
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 struct ext2_sb_info {
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-	unsigned long s_frag_size;	/* Size of a fragment in bytes */
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-	unsigned long s_frags_per_block;/* Number of fragments per block */
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 	unsigned long s_inodes_per_block;/* Number of inodes per block */
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-	unsigned long s_frags_per_group;/* Number of fragments in a group */
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 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
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 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
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 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
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@@ -177,21 +174,13 @@
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 #define EXT2_MIN_BLOCK_SIZE		1024
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 #define	EXT2_MAX_BLOCK_SIZE		4096
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 #define EXT2_MIN_BLOCK_LOG_SIZE		  10
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+#define EXT2_MAX_BLOCK_LOG_SIZE		  16
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 #define EXT2_BLOCK_SIZE(s)		((s)->s_blocksize)
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 #define	EXT2_ADDR_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (__u32))
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 #define EXT2_BLOCK_SIZE_BITS(s)		((s)->s_blocksize_bits)
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 #define	EXT2_ADDR_PER_BLOCK_BITS(s)	(EXT2_SB(s)->s_addr_per_block_bits)
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 #define EXT2_INODE_SIZE(s)		(EXT2_SB(s)->s_inode_size)
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 #define EXT2_FIRST_INO(s)		(EXT2_SB(s)->s_first_ino)
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-
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-/*
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- * Macro-instructions used to manage fragments
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- */
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-#define EXT2_MIN_FRAG_SIZE		1024
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-#define	EXT2_MAX_FRAG_SIZE		4096
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-#define EXT2_MIN_FRAG_LOG_SIZE		  10
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-#define EXT2_FRAG_SIZE(s)		(EXT2_SB(s)->s_frag_size)
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-#define EXT2_FRAGS_PER_BLOCK(s)		(EXT2_SB(s)->s_frags_per_block)
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 /*
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  * Structure of a blocks group descriptor
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@@ -374,7 +363,6 @@
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 /*
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  * Mount flags
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  */
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-#define EXT2_MOUNT_CHECK		0x000001  /* Do mount-time checks */
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 #define EXT2_MOUNT_OLDALLOC		0x000002  /* Don't use the new Orlov allocator */
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 #define EXT2_MOUNT_GRPID		0x000004  /* Create files with directory's group */
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 #define EXT2_MOUNT_DEBUG		0x000008  /* Some debugging messages */
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@@ -390,11 +378,7 @@
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 #define EXT2_MOUNT_USRQUOTA		0x020000  /* user quota */
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 #define EXT2_MOUNT_GRPQUOTA		0x040000  /* group quota */
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 #define EXT2_MOUNT_RESERVATION		0x080000  /* Preallocation */
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-#ifdef CONFIG_FS_DAX
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 #define EXT2_MOUNT_DAX			0x100000  /* Direct Access */
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-#else
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-#define EXT2_MOUNT_DAX			0
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-#endif
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 #define clear_opt(o, opt)		o &= ~EXT2_MOUNT_##opt
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@@ -608,22 +592,6 @@
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 };
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 /*
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- * Ext2 directory file types.  Only the low 3 bits are used.  The
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- * other bits are reserved for now.
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- */
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-enum {
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-	EXT2_FT_UNKNOWN		= 0,
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-	EXT2_FT_REG_FILE	= 1,
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-	EXT2_FT_DIR		= 2,
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-	EXT2_FT_CHRDEV		= 3,
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-	EXT2_FT_BLKDEV		= 4,
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-	EXT2_FT_FIFO		= 5,
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-	EXT2_FT_SOCK		= 6,
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-	EXT2_FT_SYMLINK		= 7,
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-	EXT2_FT_MAX
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-};
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-
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-/*
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  * EXT2_DIR_PAD defines the directory entries boundaries
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  *
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  * NOTE: It must be a multiple of 4
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@@ -758,7 +726,8 @@
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 /* dir.c */
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 extern int ext2_add_link (struct dentry *, struct inode *);
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-extern ino_t ext2_inode_by_name(struct inode *, const struct qstr *);
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+extern int ext2_inode_by_name(struct inode *dir,
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+			      const struct qstr *child, ino_t *ino);
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 extern int ext2_make_empty(struct inode *, struct inode *);
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 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **);
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 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
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@@ -778,6 +747,7 @@
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 extern void ext2_evict_inode(struct inode *);
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 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
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 extern int ext2_setattr (struct dentry *, struct iattr *);
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+extern int ext2_getattr (const struct path *, struct kstat *, u32, unsigned int);
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 extern void ext2_set_inode_flags(struct inode *inode);
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 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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 		       u64 start, u64 len);
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@@ -832,6 +802,18 @@
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 		le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
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 }
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+static inline ext2_fsblk_t
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+ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
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+{
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+	struct ext2_sb_info *sbi = EXT2_SB(sb);
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+
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+	if (group_no == sbi->s_groups_count - 1)
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+		return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
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+	else
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+		return ext2_group_first_block_no(sb, group_no) +
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+			EXT2_BLOCKS_PER_GROUP(sb) - 1;
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+}
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+
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 #define ext2_set_bit	__test_and_set_bit_le
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 #define ext2_clear_bit	__test_and_clear_bit_le
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 #define ext2_test_bit	test_bit_le