From 6778948f9de86c3cfaf36725a7c87dcff9ba247f Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 08:20:59 +0000
Subject: [PATCH] kernel_5.10 no rt
---
kernel/fs/fat/fat.h | 34 +++++++++++++++++++++++++++++++++-
1 files changed, 33 insertions(+), 1 deletions(-)
diff --git a/kernel/fs/fat/fat.h b/kernel/fs/fat/fat.h
index 9d7d2d5..922a0c6 100644
--- a/kernel/fs/fat/fat.h
+++ b/kernel/fs/fat/fat.h
@@ -142,6 +142,34 @@
return sb->s_fs_info;
}
+/*
+ * Functions that determine the variant of the FAT file system (i.e.,
+ * whether this is FAT12, FAT16 or FAT32.
+ */
+static inline bool is_fat12(const struct msdos_sb_info *sbi)
+{
+ return sbi->fat_bits == 12;
+}
+
+static inline bool is_fat16(const struct msdos_sb_info *sbi)
+{
+ return sbi->fat_bits == 16;
+}
+
+static inline bool is_fat32(const struct msdos_sb_info *sbi)
+{
+ return sbi->fat_bits == 32;
+}
+
+/* Maximum number of clusters */
+static inline u32 max_fat(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+ return is_fat32(sbi) ? MAX_FAT32 :
+ is_fat16(sbi) ? MAX_FAT16 : MAX_FAT12;
+}
+
static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
{
return container_of(inode, struct msdos_inode_info, vfs_inode);
@@ -257,7 +285,7 @@
const struct msdos_dir_entry *de)
{
int cluster = le16_to_cpu(de->start);
- if (sbi->fat_bits == 32)
+ if (is_fat32(sbi))
cluster |= (le16_to_cpu(de->starthi) << 16);
return cluster;
}
@@ -416,6 +444,10 @@
__le16 __time, __le16 __date, u8 time_cs);
extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec64 *ts,
__le16 *time, __le16 *date, u8 *time_cs);
+extern int fat_truncate_time(struct inode *inode, struct timespec64 *now,
+ int flags);
+extern int fat_update_time(struct inode *inode, struct timespec64 *now,
+ int flags);
extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
int fat_cache_init(void);
--
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