add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/hfsplus/hfsplus_fs.h
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@@ -117,7 +117,7 @@
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 	wait_queue_head_t lock_wq;
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 	atomic_t refcnt;
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 	unsigned int page_offset;
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-	struct page *page[0];
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+	struct page *page[];
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 };
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 #define HFS_BNODE_LOCK		0
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@@ -198,6 +198,8 @@
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 #define HFSPLUS_SB_HFSX		3
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 #define HFSPLUS_SB_CASEFOLD	4
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 #define HFSPLUS_SB_NOBARRIER	5
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+#define HFSPLUS_SB_UID		6
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+#define HFSPLUS_SB_GID		7
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 static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
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 {
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@@ -488,6 +490,8 @@
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 			      struct hfsplus_fork_raw *fork);
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 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd);
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 int hfsplus_cat_write_inode(struct inode *inode);
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+int hfsplus_getattr(const struct path *path, struct kstat *stat,
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+		    u32 request_mask, unsigned int query_flags);
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 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
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 		       int datasync);
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@@ -531,13 +535,31 @@
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 		       void **data, int op, int op_flags);
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 int hfsplus_read_wrapper(struct super_block *sb);
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-/* time macros */
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-#define __hfsp_mt2ut(t)		(be32_to_cpu(t) - 2082844800U)
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-#define __hfsp_ut2mt(t)		(cpu_to_be32(t + 2082844800U))
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+/*
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+ * time helpers: convert between 1904-base and 1970-base timestamps
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+ *
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+ * HFS+ implementations are highly inconsistent, this one matches the
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+ * traditional behavior of 64-bit Linux, giving the most useful
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+ * time range between 1970 and 2106, by treating any on-disk timestamp
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+ * under HFSPLUS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106.
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+ */
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+#define HFSPLUS_UTC_OFFSET 2082844800U
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+
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+static inline time64_t __hfsp_mt2ut(__be32 mt)
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+{
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+	time64_t ut = (u32)(be32_to_cpu(mt) - HFSPLUS_UTC_OFFSET);
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+
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+	return ut;
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+}
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+
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+static inline __be32 __hfsp_ut2mt(time64_t ut)
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+{
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+	return cpu_to_be32(lower_32_bits(ut) + HFSPLUS_UTC_OFFSET);
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+}
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 /* compatibility */
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-#define hfsp_mt2ut(t)		(struct timespec){ .tv_sec = __hfsp_mt2ut(t) }
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+#define hfsp_mt2ut(t)		(struct timespec64){ .tv_sec = __hfsp_mt2ut(t) }
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 #define hfsp_ut2mt(t)		__hfsp_ut2mt((t).tv_sec)
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-#define hfsp_now2mt()		__hfsp_ut2mt(get_seconds())
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+#define hfsp_now2mt()		__hfsp_ut2mt(ktime_get_real_seconds())
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 #endif