[Pkg-lustre-svn-commit] r310 - in /trunk/ldiskfs/kernel_patches: patches/ext3-nanosecond-2.6.23-vanilla.patch series/ldiskfs-2.6.23-vanilla.series

pwinnertz-guest at users.alioth.debian.org pwinnertz-guest at users.alioth.debian.org
Fri Sep 14 15:17:09 UTC 2007


Author: pwinnertz-guest
Date: Fri Sep 14 15:17:09 2007
New Revision: 310

URL: http://svn.debian.org/wsvn/pkg-lustre/?sc=1&rev=310
Log:
we need a own patch for 2.6.23, some things have changed

Added:
    trunk/ldiskfs/kernel_patches/patches/ext3-nanosecond-2.6.23-vanilla.patch
Modified:
    trunk/ldiskfs/kernel_patches/series/ldiskfs-2.6.23-vanilla.series

Added: trunk/ldiskfs/kernel_patches/patches/ext3-nanosecond-2.6.23-vanilla.patch
URL: http://svn.debian.org/wsvn/pkg-lustre/trunk/ldiskfs/kernel_patches/patches/ext3-nanosecond-2.6.23-vanilla.patch?rev=310&op=file
==============================================================================
--- trunk/ldiskfs/kernel_patches/patches/ext3-nanosecond-2.6.23-vanilla.patch (added)
+++ trunk/ldiskfs/kernel_patches/patches/ext3-nanosecond-2.6.23-vanilla.patch Fri Sep 14 15:17:09 2007
@@ -1,0 +1,404 @@
+Index: linux-stage/fs/ext3/ialloc.c
+===================================================================
+--- linux-stage.orig/fs/ext3/ialloc.c	2007-09-10 17:04:21.000000000 +0200
++++ linux-stage/fs/ext3/ialloc.c	2007-09-10 17:05:30.000000000 +0200
+@@ -727,7 +727,8 @@
+ 	inode->i_ino = ino + group * EXT3_INODES_PER_GROUP(sb);
+ 	/* This is the optimal IO size (for stat), not the fs block size */
+ 	inode->i_blocks = 0;
+-	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
++	inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime =
++						       ext3_current_time(inode);
+ 
+ 	memset(ei->i_data, 0, sizeof(ei->i_data));
+ 	ei->i_dir_start_lookup = 0;
+@@ -761,9 +762,8 @@
+ 	spin_unlock(&sbi->s_next_gen_lock);
+ 
+ 	ei->i_state = EXT3_STATE_NEW;
+-	ei->i_extra_isize =
+-		(EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) ?
+-		sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE : 0;
++
++	ei->i_extra_isize = EXT3_SB(sb)->s_want_extra_isize;
+ 
+ 	ret = inode;
+ 	if(DQUOT_ALLOC_INODE(inode)) {
+Index: linux-stage/fs/ext3/inode.c
+===================================================================
+--- linux-stage.orig/fs/ext3/inode.c	2007-09-10 16:58:15.000000000 +0200
++++ linux-stage/fs/ext3/inode.c	2007-09-10 17:07:14.000000000 +0200
+@@ -727,7 +727,7 @@
+ 
+ 	/* We are done with atomic stuff, now do the rest of housekeeping */
+ 
+-	inode->i_ctime = CURRENT_TIME_SEC;
++	inode->i_ctime = ext3_current_time(inode);
+ 	ext3_mark_inode_dirty(handle, inode);
+ 
+ 	/* had we spliced it onto indirect block? */
+@@ -2367,7 +2367,7 @@
+ 	ext3_discard_reservation(inode);
+ 
+ 	mutex_unlock(&ei->truncate_mutex);
+-	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
++	inode->i_mtime = inode->i_ctime = ext3_current_time(inode);
+ 	ext3_mark_inode_dirty(handle, inode);
+ 
+ 	/*
+@@ -2622,10 +2622,6 @@
+ 	}
+ 	inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
+ 	inode->i_size = le32_to_cpu(raw_inode->i_size);
+-	inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime);
+-	inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime);
+-	inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime);
+-	inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_mtime.tv_nsec = 0;
+ 
+ 	ei->i_state = 0;
+ 	ei->i_dir_start_lookup = 0;
+@@ -2699,6 +2695,11 @@
+ 	} else
+ 		ei->i_extra_isize = 0;
+ 
++	EXT3_INODE_GET_XTIME(i_ctime, inode, raw_inode);
++	EXT3_INODE_GET_XTIME(i_mtime, inode, raw_inode);
++	EXT3_INODE_GET_XTIME(i_atime, inode, raw_inode);
++	EXT3_EINODE_GET_XTIME(i_crtime, ei, raw_inode);
++
+ 	if (S_ISREG(inode->i_mode)) {
+ 		inode->i_op = &ext3_file_inode_operations;
+ 		inode->i_fop = &ext3_file_operations;
+@@ -2780,9 +2781,12 @@
+ 	}
+ 	raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
+ 	raw_inode->i_size = cpu_to_le32(ei->i_disksize);
+-	raw_inode->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
+-	raw_inode->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
+-	raw_inode->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
++
++	EXT3_INODE_SET_XTIME(i_ctime, inode, raw_inode);
++	EXT3_INODE_SET_XTIME(i_mtime, inode, raw_inode);
++	EXT3_INODE_SET_XTIME(i_atime, inode, raw_inode);
++	EXT3_EINODE_SET_XTIME(i_crtime, ei, raw_inode);
++
+ 	raw_inode->i_blocks = cpu_to_le32(inode->i_blocks);
+ 	raw_inode->i_dtime = cpu_to_le32(ei->i_dtime);
+ 	raw_inode->i_flags = cpu_to_le32(ei->i_flags);
+Index: linux-stage/fs/ext3/ioctl.c
+===================================================================
+--- linux-stage.orig/fs/ext3/ioctl.c	2007-09-10 16:56:51.000000000 +0200
++++ linux-stage/fs/ext3/ioctl.c	2007-09-10 17:05:30.000000000 +0200
+@@ -123,7 +123,7 @@
+ 		ei->i_flags = flags;
+ 
+ 		ext3_set_inode_flags(inode);
+-		inode->i_ctime = CURRENT_TIME_SEC;
++		inode->i_ctime = ext3_current_time(inode);
+ 
+ 		err = ext3_mark_iloc_dirty(handle, inode, &iloc);
+ flags_err:
+@@ -160,7 +160,7 @@
+ 			return PTR_ERR(handle);
+ 		err = ext3_reserve_inode_write(handle, inode, &iloc);
+ 		if (err == 0) {
+-			inode->i_ctime = CURRENT_TIME_SEC;
++			inode->i_ctime = ext3_current_time(inode);
+ 			inode->i_generation = generation;
+ 			err = ext3_mark_iloc_dirty(handle, inode, &iloc);
+ 		}
+Index: linux-stage/fs/ext3/namei.c
+===================================================================
+--- linux-stage.orig/fs/ext3/namei.c	2007-09-10 17:04:15.000000000 +0200
++++ linux-stage/fs/ext3/namei.c	2007-09-10 17:06:23.000000000 +0200
+@@ -1320,7 +1320,7 @@
+ 	 * happen is that the times are slightly out of date
+ 	 * and/or different from the directory change time.
+ 	 */
+-	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
++	dir->i_mtime = dir->i_ctime = ext3_current_time(dir);
+ 	ext3_update_dx_flag(dir);
+ 	dir->i_version++;
+ 	ext3_mark_inode_dirty(handle, dir);
+@@ -2091,7 +2091,7 @@
+ 	inode->i_version++;
+ 	clear_nlink(inode);
+ 	ext3_orphan_add(handle, inode);
+-	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
++	inode->i_ctime = dir->i_ctime = dir->i_mtime = ext3_current_time(inode);
+ 	ext3_mark_inode_dirty(handle, inode);
+ 	ext3_dec_count(handle, dir);
+ 	ext3_update_dx_flag(dir);
+@@ -2141,13 +2141,13 @@
+ 	retval = ext3_delete_entry(handle, dir, de, bh);
+ 	if (retval)
+ 		goto end_unlink;
+-	dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
++	dir->i_ctime = dir->i_mtime = ext3_current_time(dir);
+ 	ext3_update_dx_flag(dir);
+ 	ext3_mark_inode_dirty(handle, dir);
+ 	drop_nlink(inode);
+ 	if (!inode->i_nlink)
+ 		ext3_orphan_add(handle, inode);
+-	inode->i_ctime = dir->i_ctime;
++	inode->i_ctime = ext3_current_time(inode);
+ 	ext3_mark_inode_dirty(handle, inode);
+ 	retval = 0;
+ 
+@@ -2255,7 +2255,7 @@
+ 	if (IS_DIRSYNC(dir))
+ 		handle->h_sync = 1;
+ 
+-	inode->i_ctime = CURRENT_TIME_SEC;
++	inode->i_ctime = ext3_current_time(inode);
+ 	inc_nlink(inode);
+ 	atomic_inc(&inode->i_count);
+ 
+@@ -2358,7 +2358,7 @@
+ 	 * Like most other Unix systems, set the ctime for inodes on a
+ 	 * rename.
+ 	 */
+-	old_inode->i_ctime = CURRENT_TIME_SEC;
++	old_inode->i_ctime = ext3_current_time(old_inode);
+ 	ext3_mark_inode_dirty(handle, old_inode);
+ 
+ 	/*
+@@ -2391,9 +2391,9 @@
+ 
+ 	if (new_inode) {
+ 		drop_nlink(new_inode);
+-		new_inode->i_ctime = CURRENT_TIME_SEC;
++		new_inode->i_ctime = ext3_current_time(new_inode);
+ 	}
+-	old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
++	old_dir->i_ctime = old_dir->i_mtime = ext3_current_time(old_dir);
+ 	ext3_update_dx_flag(old_dir);
+ 	if (dir_bh) {
+ 		BUFFER_TRACE(dir_bh, "get_write_access");
+Index: linux-stage/fs/ext3/super.c
+===================================================================
+--- linux-stage.orig/fs/ext3/super.c	2007-09-10 17:04:21.000000000 +0200
++++ linux-stage/fs/ext3/super.c	2007-09-10 17:05:30.000000000 +0200
+@@ -1720,6 +1720,8 @@
+ 				sbi->s_inode_size);
+ 			goto failed_mount;
+ 		}
++		if (sbi->s_inode_size > EXT3_GOOD_OLD_INODE_SIZE)
++			sb->s_time_gran = 1 << (EXT3_EPOCH_BITS - 2);
+ 	}
+ 	sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
+ 				   le32_to_cpu(es->s_log_frag_size);
+@@ -1923,6 +1925,32 @@
+ 	}
+ 
+ 	ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
++
++	/* determine the minimum size of new large inodes, if present */
++	if (sbi->s_inode_size > EXT3_GOOD_OLD_INODE_SIZE) {
++		sbi->s_want_extra_isize = sizeof(struct ext3_inode) -
++						     EXT3_GOOD_OLD_INODE_SIZE;
++		if (EXT3_HAS_RO_COMPAT_FEATURE(sb,
++				       EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
++			if (sbi->s_want_extra_isize <
++			    le16_to_cpu(es->s_want_extra_isize))
++				sbi->s_want_extra_isize =
++					le16_to_cpu(es->s_want_extra_isize);
++			if (sbi->s_want_extra_isize <
++			    le16_to_cpu(es->s_min_extra_isize))
++				sbi->s_want_extra_isize =
++					le16_to_cpu(es->s_min_extra_isize);
++		}
++	}
++	/* Check if enough inode space is available */
++	if (EXT3_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
++							sbi->s_inode_size) {
++		sbi->s_want_extra_isize = sizeof(struct ext3_inode) -
++						       EXT3_GOOD_OLD_INODE_SIZE;
++		printk(KERN_INFO "EXT3-fs: required extra inode space not"
++			"available.\n");
++	}
++
+ 	/*
+ 	 * akpm: core read_super() calls in here with the superblock locked.
+ 	 * That deadlocks, because orphan cleanup needs to lock the superblock
+Index: linux-stage/fs/ext3/xattr.c
+===================================================================
+--- linux-stage.orig/fs/ext3/xattr.c	2007-09-10 16:58:15.000000000 +0200
++++ linux-stage/fs/ext3/xattr.c	2007-09-10 17:05:30.000000000 +0200
+@@ -1015,7 +1015,7 @@
+ 	}
+ 	if (!error) {
+ 		ext3_xattr_update_super_block(handle, inode->i_sb);
+-		inode->i_ctime = CURRENT_TIME_SEC;
++		inode->i_ctime = ext3_current_time(inode);
+ 		error = ext3_mark_iloc_dirty(handle, inode, &is.iloc);
+ 		/*
+ 		 * The bh is consumed by ext3_mark_iloc_dirty, even with
+Index: linux-stage/include/linux/ext3_fs.h
+===================================================================
+--- linux-stage.orig/include/linux/ext3_fs.h	2007-09-10 17:04:21.000000000 +0200
++++ linux-stage/include/linux/ext3_fs.h	2007-09-10 17:05:30.000000000 +0200
+@@ -301,7 +301,7 @@
+ 	__le16	i_uid;		/* Low 16 bits of Owner Uid */
+ 	__le32	i_size;		/* Size in bytes */
+ 	__le32	i_atime;	/* Access time */
+-	__le32	i_ctime;	/* Creation time */
++	__le32	i_ctime;	/* Inode Change time */
+ 	__le32	i_mtime;	/* Modification time */
+ 	__le32	i_dtime;	/* Deletion Time */
+ 	__le16	i_gid;		/* Low 16 bits of Group Id */
+@@ -350,10 +350,73 @@
+ 	} osd2;				/* OS dependent 2 */
+ 	__le16	i_extra_isize;
+ 	__le16	i_pad1;
++	__le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
++	__le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
++	__le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
++	__le32  i_crtime;       /* File Creation time */
++	__le32  i_crtime_extra; /* extra File Creation time (nsec << 2 | epoch) */
+ };
+ 
+ #define i_size_high	i_dir_acl
+ 
++#define EXT3_EPOCH_BITS 2
++#define EXT3_EPOCH_MASK ((1 << EXT3_EPOCH_BITS) - 1)
++#define EXT3_NSEC_MASK  (~0UL << EXT3_EPOCH_BITS)
++
++#define EXT3_FITS_IN_INODE(ext3_inode, einode, field)	\
++	((offsetof(typeof(*ext3_inode), field) +	\
++	  sizeof((ext3_inode)->field))			\
++	<= (EXT3_GOOD_OLD_INODE_SIZE +			\
++	    (einode)->i_extra_isize))			\
++
++static inline __le32 ext3_encode_extra_time(struct timespec *time)
++{
++	return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
++			    time->tv_sec >> 32 : 0) |
++			    ((time->tv_nsec << 2) & EXT3_NSEC_MASK));
++}
++
++static inline void ext3_decode_extra_time(struct timespec *time, __le32 extra) {
++	if (sizeof(time->tv_sec) > 4)
++		time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT3_EPOCH_MASK)
++				<< 32;
++	time->tv_nsec = (le32_to_cpu(extra) & EXT3_NSEC_MASK) >> 2;
++}
++
++#define EXT3_INODE_SET_XTIME(xtime, inode, raw_inode)			       \
++do {									       \
++	(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);	       \
++	if (EXT3_FITS_IN_INODE(raw_inode, EXT3_I(inode), xtime ## _extra))     \
++		(raw_inode)->xtime ## _extra =				       \
++				ext3_encode_extra_time(&(inode)->xtime);       \
++} while (0)
++
++#define EXT3_EINODE_SET_XTIME(xtime, einode, raw_inode)\
++do {									       \
++	if (EXT3_FITS_IN_INODE(raw_inode, einode, xtime))		       \
++		(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
++	if (EXT3_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
++		(raw_inode)->xtime ## _extra =				       \
++				ext3_encode_extra_time(&(einode)->xtime);      \
++} while (0)
++
++#define EXT3_INODE_GET_XTIME(xtime, inode, raw_inode)			       \
++do {									       \
++	(inode)->xtime.tv_sec = le32_to_cpu((raw_inode)->xtime);	       \
++	if (EXT3_FITS_IN_INODE(raw_inode, EXT3_I(inode), xtime ## _extra))     \
++		ext3_decode_extra_time(&(inode)->xtime,			       \
++				       raw_inode->xtime ## _extra);	       \
++} while (0)
++
++#define EXT3_EINODE_GET_XTIME(xtime, einode, raw_inode) 		       \
++do {									       \
++	if (EXT3_FITS_IN_INODE(raw_inode, einode, xtime))		       \
++		(einode)->xtime.tv_sec = le32_to_cpu((raw_inode)->xtime);      \
++	if (EXT3_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))	       \
++		ext3_decode_extra_time(&(einode)->xtime,		       \
++				       raw_inode->xtime ## _extra);	       \
++} while (0)
++
+ #if defined(__KERNEL__) || defined(__linux__)
+ #define i_reserved1	osd1.linux1.l_i_reserved1
+ #define i_frag		osd2.linux2.l_i_frag
+@@ -534,11 +597,19 @@
+ 	__le32	s_last_orphan;		/* start of list of inodes to delete */
+ 	__le32	s_hash_seed[4];		/* HTREE hash seed */
+ 	__u8	s_def_hash_version;	/* Default hash version to use */
+-	__u8	s_reserved_char_pad;
+-	__u16	s_reserved_word_pad;
++	__u8    s_jnl_backup_type;      /* Default type of journal backup */
++	__le16  s_desc_size;            /* Group desc. size: INCOMPAT_64BIT */
+ 	__le32	s_default_mount_opts;
+-	__le32	s_first_meta_bg;	/* First metablock block group */
+-	__u32	s_reserved[190];	/* Padding to the end of the block */
++	__le32  s_first_meta_bg;        /* First metablock block group */
++	__le32  s_mkfs_time;            /* When the filesystem was created */
++	__le32  s_jnl_blocks[17];       /* Backup of the journal inode */
++	__le32  s_blocks_count_hi;      /* Blocks count high 32 bits */
++	__le32  s_r_blocks_count_hi;    /* Reserved blocks count high 32 bits*/
++	__le32  s_free_blocks_count_hi; /* Free blocks count high 32 bits */
++	__le16  s_min_extra_isize;      /* All inodes have at least # bytes */
++	__le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
++	__le32  s_flags;                /* Miscellaneous flags */
++	__u32   s_reserved[167];        /* Padding to the end of the block */
+ };
+ 
+ #ifdef __KERNEL__
+@@ -553,6 +624,13 @@
+ 	return container_of(inode, struct ext3_inode_info, vfs_inode);
+ }
+ 
++static inline struct timespec ext3_current_time(struct inode *inode)
++{
++	return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
++		current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
++}
++
++
+ static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
+ {
+ 	return ino == EXT3_ROOT_INO ||
+@@ -624,6 +702,7 @@
+ #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
+ #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
+ #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
++#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
+ 
+ #define EXT3_FEATURE_INCOMPAT_COMPRESSION	0x0001
+ #define EXT3_FEATURE_INCOMPAT_FILETYPE		0x0002
+@@ -640,6 +719,7 @@
+ #define EXT3_FEATURE_RO_COMPAT_SUPP	(EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
+ 					 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
+ 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
++					 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE| \
+ 					 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
+ 
+ /*
+Index: linux-stage/include/linux/ext3_fs_sb.h
+===================================================================
+--- linux-stage.orig/include/linux/ext3_fs_sb.h	2007-09-10 17:04:16.000000000 +0200
++++ linux-stage/include/linux/ext3_fs_sb.h	2007-09-10 17:05:30.000000000 +0200
+@@ -68,6 +68,9 @@
+ 	/* Last group used to allocate inode */
+ 	int s_last_alloc_group;
+ 
++	/* New inodes should reserve # bytes */
++	unsigned int  s_want_extra_isize;
++
+ 	/* root of the per fs reservation window tree */
+ 	spinlock_t s_rsv_window_lock;
+ 	struct rb_root s_rsv_window_root;
+Index: linux-stage/include/linux/ext3_fs_i.h
+===================================================================
+--- linux-stage.orig/include/linux/ext3_fs_i.h	2007-09-10 17:04:19.000000000 +0200
++++ linux-stage/include/linux/ext3_fs_i.h	2007-09-10 17:05:30.000000000 +0200
+@@ -140,6 +140,8 @@
+ 	/* on-disk additional length */
+ 	__u16 i_extra_isize;
+ 
++	struct timespec i_crtime;
++
+ 	/*
+ 	 * truncate_mutex is for serialising ext3_truncate() against
+ 	 * ext3_getblock().  In the 2.4 ext2 design, great chunks of inode's

Modified: trunk/ldiskfs/kernel_patches/series/ldiskfs-2.6.23-vanilla.series
URL: http://svn.debian.org/wsvn/pkg-lustre/trunk/ldiskfs/kernel_patches/series/ldiskfs-2.6.23-vanilla.series?rev=310&op=diff
==============================================================================
--- trunk/ldiskfs/kernel_patches/series/ldiskfs-2.6.23-vanilla.series (original)
+++ trunk/ldiskfs/kernel_patches/series/ldiskfs-2.6.23-vanilla.series Fri Sep 14 15:17:09 2007
@@ -12,7 +12,7 @@
 ext3-remove-cond_resched-calls-2.6.12.patch
 ext3-filterdata-2.6.20.patch
 ext3-uninit-2.6.20.patch
-ext3-nanosecond-2.6.22-vanilla.patch
+ext3-nanosecond-2.6.23-vanilla.patch
 ext3-inode-version-2.6.18-vanilla.patch
 ext3-mmp-2.6.20-vanilla.patch
 bug12861.patch




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