exfat: changes the minimum supported kernel version from 4.10 to 5.15

Backporting new patches to the 4.x kernel has become difficult.
The existing 4.x support version was made into a branch of
for-kernel-version-from-4.1.0.

Signed-off-by: Namjae Jeon <[email protected]>

.github/workflows/c-cpp.yml

@@ -17,10 +17,10 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get install libelf-dev wget tar gzip python2.7
-        wget https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/linux-4.1.36.tar.gz
-        tar xf linux-4.1.36.tar.gz
-        mv linux-4.1.36 linux-stable
-        rm -rf linux-4.1.36.tar.gz
+        wget https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/linux-5.15.140.tar.gz
+        tar xf linux-5.15.140.tar.gz
+        mv linux-5.15.140 linux-stable
+        rm -rf linux-5.15.140.tar.gz
     - name: Prerequisite for xfstests testing
       run: |
         sudo apt-get install linux-headers-$(uname -r)
@@ -35,14 +35,11 @@ jobs:
     - name: Copy exfat source to kernel
       run: |
         mv linux-stable ../
-        mkdir ../linux-stable/fs/exfat
         cp -ar * ../linux-stable/fs/exfat/
-    - name: Compile with 4.1 kernel
+    - name: Compile with 5.15 kernel
       run: |
         cd ../linux-stable
         yes "" | make oldconfig > /dev/null
-        echo 'obj-$(CONFIG_EXFAT_FS) += exfat/' >> fs/Makefile
-        echo 'source "fs/exfat/Kconfig"' >> fs/Kconfig
         echo 'CONFIG_EXFAT_FS=m' >> .config
         echo 'CONFIG_EXFAT_DEFAULT_IOCHARSET="utf8"' >> .config
         make -j$((`nproc`+1)) fs/exfat/exfat.ko

README.md

@@ -1,5 +1,5 @@
 ## exFAT filesystem 
-This is the exfat filesystem for support from the linux 4.1 kernel
+This is the exfat filesystem for support from the linux 5.15 kernel
 to the latest kernel. 
 
 ## Installing as a stand-alone module

balloc.c

@@ -7,11 +7,7 @@
 #include <linux/blkdev.h>
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
 #include <linux/sched/signal.h>
-#else
-#include <linux/sched.h>
-#endif
 #include <linux/vmalloc.h>
 
 #include "exfat_raw.h"
@@ -76,12 +72,8 @@ static int exfat_allocate_bitmap(struct super_block *sb,
 	}
 	sbi->map_sectors = ((need_map_size - 1) >>
 			(sb->s_blocksize_bits)) + 1;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
 	sbi->vol_amap = kvmalloc_array(sbi->map_sectors,
 				sizeof(struct buffer_head *), GFP_KERNEL);
-#else
-	sbi->vol_amap = vmalloc(sbi->map_sectors * sizeof(struct buffer_head *));
-#endif
 	if (!sbi->vol_amap)
 		return -ENOMEM;
 

dir.c

@@ -461,19 +461,11 @@ int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
 {
 	struct super_block *sb = inode->i_sb;
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
 	struct timespec64 ts;
-#else
-	struct timespec ts;
-#endif
 	struct exfat_dentry *ep;
 	struct buffer_head *bh;
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
 	ts = current_time(inode);
-#else
-	ts = CURRENT_TIME_SEC;
-#endif
 
 	/*
 	 * We cannot use exfat_get_dentry_set here because file ep is not

exfat_fs.h

@@ -222,15 +222,9 @@ struct exfat_dir_entry {
 	unsigned short attr;
 	loff_t size;
 	unsigned int num_subdirs;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
 	struct timespec64 atime;
 	struct timespec64 mtime;
 	struct timespec64 crtime;
-#else
-	struct timespec atime;
-	struct timespec mtime;
-	struct timespec crtime;
-#endif
 	struct exfat_dentry_namebuf namebuf;
 };
 
@@ -344,11 +338,7 @@ struct exfat_inode_info {
 	struct rw_semaphore truncate_lock;
 	struct inode vfs_inode;
 	/* File creation time */
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
 	struct timespec64 i_crtime;
-#else
-	struct timespec i_crtime;
-#endif
 };
 
 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)
@@ -478,7 +468,6 @@ extern const struct file_operations exfat_file_operations;
 int __exfat_truncate(struct inode *inode);
 void exfat_truncate(struct inode *inode);
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 3, 0)
 int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 		  struct iattr *attr);
@@ -492,16 +481,6 @@ int exfat_getattr(struct user_namespace *mnt_userns, const struct path *path,
 		  struct kstat *stat, unsigned int request_mask,
 		  unsigned int query_flags);
 #endif
-#else
-int exfat_setattr(struct dentry *dentry, struct iattr *attr);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
-int exfat_getattr(const struct path *path, struct kstat *stat,
-		unsigned int request_mask, unsigned int query_flags);
-#else
-int exfat_getattr(struct vfsmount *mnt, struct dentry *dentry,
-		struct kstat *stat);
-#endif
-#endif
 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
@@ -594,7 +573,6 @@ void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
 #define exfat_debug(sb, fmt, ...)					\
 	pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0)
 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
 		u8 tz, __le16 time, __le16 date, u8 time_cs);
 void exfat_truncate_atime(struct timespec64 *ts);
@@ -603,13 +581,6 @@ void exfat_truncate_inode_atime(struct inode *inode);
 #endif
 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
 		u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
-#else
-void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec *ts,
-		u8 tz, __le16 time, __le16 date, u8 time_cs);
-void exfat_truncate_atime(struct timespec *ts);
-void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec *ts,
-		u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
-#endif
 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
 void exfat_update_bh(struct buffer_head *bh, int sync);

fatent.c

@@ -27,11 +27,7 @@ static int exfat_mirror_bh(struct super_block *sb, sector_t sec,
 		memcpy(c_bh->b_data, bh->b_data, sb->s_blocksize);
 		set_buffer_uptodate(c_bh);
 		mark_buffer_dirty(c_bh);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 		if (sb->s_flags & SB_SYNCHRONOUS)
-#else
-		if (sb->s_flags & MS_SYNCHRONOUS)
-#endif
 			err = sync_dirty_buffer(c_bh);
 		brelse(c_bh);
 	}
@@ -80,11 +76,7 @@ int exfat_ent_set(struct super_block *sb, unsigned int loc,
 
 	fat_entry = (__le32 *)&(bh->b_data[off]);
 	*fat_entry = cpu_to_le32(content);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 	exfat_update_bh(bh, sb->s_flags & SB_SYNCHRONOUS);
-#else
-	exfat_update_bh(bh, sb->s_flags & MS_SYNCHRONOUS);
-#endif
 	exfat_mirror_bh(sb, sec, bh);
 	brelse(bh);
 	return 0;