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Commit 3be78c73 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: use unsigned int for es_status values 



Don't use an unsigned long long for the es_status flags; this requires
that we pass 64-bit values around which is painful on 32-bit systems.
Instead pass the extent status flags around using the low 4 bits of an
unsigned int, and shift them into place when we are reading or writing
es_pblk.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: default avatarZheng Liu <wenqing.lz@taobao.com>
parent c349179b

fs/ext4/extents_status.c

+3 −3
Original line number Diff line number Diff line
@@ -263,7 +263,7 @@ void ext4_es_find_delayed_extent_range(struct inode *inode, 
	if (tree->cache_es) {

		es1 = tree->cache_es;

		if (in_range(lblk, es1->es_lblk, es1->es_len)) {

			es_debug("%u cached by [%u/%u) %llu %llx\n",

			es_debug("%u cached by [%u/%u) %llu %x\n",

				 lblk, es1->es_lblk, es1->es_len,

				 ext4_es_pblock(es1), ext4_es_status(es1));

			goto out;
@@ -641,13 +641,13 @@ out: 
 */

int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,

			  ext4_lblk_t len, ext4_fsblk_t pblk,

			  unsigned long long status)

			  unsigned int status)

{

	struct extent_status newes;

	ext4_lblk_t end = lblk + len - 1;

	int err = 0;



	es_debug("add [%u/%u) %llu %llx to extent status tree of inode %lu\n",

	es_debug("add [%u/%u) %llu %x to extent status tree of inode %lu\n",

		 lblk, len, pblk, status, inode->i_ino);



	if (!len)

fs/ext4/extents_status.h

+27 −20
Original line number Diff line number Diff line
@@ -29,16 +29,26 @@ 
/*

 * These flags live in the high bits of extent_status.es_pblk

 */

#define EXTENT_STATUS_WRITTEN	(1ULL << 63)

#define EXTENT_STATUS_UNWRITTEN (1ULL << 62)

#define EXTENT_STATUS_DELAYED	(1ULL << 61)

#define EXTENT_STATUS_HOLE	(1ULL << 60)

#define ES_SHIFT	60



#define EXTENT_STATUS_WRITTEN	(1 << 3)

#define EXTENT_STATUS_UNWRITTEN (1 << 2)

#define EXTENT_STATUS_DELAYED	(1 << 1)

#define EXTENT_STATUS_HOLE	(1 << 0)



#define EXTENT_STATUS_FLAGS	(EXTENT_STATUS_WRITTEN | \

				 EXTENT_STATUS_UNWRITTEN | \

				 EXTENT_STATUS_DELAYED | \

				 EXTENT_STATUS_HOLE)



#define ES_WRITTEN		(1ULL << 63)

#define ES_UNWRITTEN		(1ULL << 62)

#define ES_DELAYED		(1ULL << 61)

#define ES_HOLE			(1ULL << 60)



#define ES_MASK			(ES_WRITTEN | ES_UNWRITTEN | \

				 ES_DELAYED | ES_HOLE)



struct ext4_sb_info;

struct ext4_extent;
@@ -60,7 +70,7 @@ extern void ext4_es_init_tree(struct ext4_es_tree *tree); 


extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,

				 ext4_lblk_t len, ext4_fsblk_t pblk,

				 unsigned long long status);

				 unsigned int status);

extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,

				 ext4_lblk_t len);

extern void ext4_es_find_delayed_extent_range(struct inode *inode,
@@ -72,32 +82,32 @@ extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex); 


static inline int ext4_es_is_written(struct extent_status *es)

{

	return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0;

	return (es->es_pblk & ES_WRITTEN) != 0;

}



static inline int ext4_es_is_unwritten(struct extent_status *es)

{

	return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0;

	return (es->es_pblk & ES_UNWRITTEN) != 0;

}



static inline int ext4_es_is_delayed(struct extent_status *es)

{

	return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0;

	return (es->es_pblk & ES_DELAYED) != 0;

}



static inline int ext4_es_is_hole(struct extent_status *es)

{

	return (es->es_pblk & EXTENT_STATUS_HOLE) != 0;

	return (es->es_pblk & ES_HOLE) != 0;

}



static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)

static inline unsigned int ext4_es_status(struct extent_status *es)

{

	return (es->es_pblk & EXTENT_STATUS_FLAGS);

	return es->es_pblk >> ES_SHIFT;

}



static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)

{

	return (es->es_pblk & ~EXTENT_STATUS_FLAGS);

	return es->es_pblk & ~ES_MASK;

}



static inline void ext4_es_store_pblock(struct extent_status *es,
@@ -105,19 +115,16 @@ static inline void ext4_es_store_pblock(struct extent_status *es, 
{

	ext4_fsblk_t block;



	block = (pb & ~EXTENT_STATUS_FLAGS) |

		(es->es_pblk & EXTENT_STATUS_FLAGS);

	block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);

	es->es_pblk = block;

}



static inline void ext4_es_store_status(struct extent_status *es,

					unsigned long long status)

					unsigned int status)

{

	ext4_fsblk_t block;



	block = (status & EXTENT_STATUS_FLAGS) |

		(es->es_pblk & ~EXTENT_STATUS_FLAGS);

	es->es_pblk = block;

	es->es_pblk = (((ext4_fsblk_t)

			(status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |

		       (es->es_pblk & ~ES_MASK));

}



extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);

fs/ext4/inode.c

+3 −3
Original line number Diff line number Diff line
@@ -553,7 +553,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode, 
	}

	if (retval > 0) {

		int ret;

		unsigned long long status;

		unsigned int status;



		if (unlikely(retval != map->m_len)) {

			ext4_warning(inode->i_sb,
@@ -653,7 +653,7 @@ found: 


	if (retval > 0) {

		int ret;

		unsigned long long status;

		unsigned int status;



		if (unlikely(retval != map->m_len)) {

			ext4_warning(inode->i_sb,
@@ -1633,7 +1633,7 @@ add_delayed: 
		set_buffer_delay(bh);

	} else if (retval > 0) {

		int ret;

		unsigned long long status;

		unsigned int status;



		if (unlikely(retval != map->m_len)) {

			ext4_warning(inode->i_sb,

include/trace/events/ext4.h

+7 −7
Original line number Diff line number Diff line
@@ -64,10 +64,10 @@ struct extent_status; 
	{ EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER,	"LAST_CLUSTER" })



#define show_extent_status(status) __print_flags(status, "",	\

	{ (1 << 3),	"W" }, 					\

	{ (1 << 2),	"U" },					\

	{ (1 << 1),	"D" },					\

	{ (1 << 0),	"H" })

	{ EXTENT_STATUS_WRITTEN,	"W" },			\

	{ EXTENT_STATUS_UNWRITTEN,	"U" },			\

	{ EXTENT_STATUS_DELAYED,	"D" },			\

	{ EXTENT_STATUS_HOLE,		"H" })





TRACE_EVENT(ext4_free_inode,
@@ -2212,7 +2212,7 @@ TRACE_EVENT(ext4_es_insert_extent, 
		__entry->lblk	= es->es_lblk;

		__entry->len	= es->es_len;

		__entry->pblk	= ext4_es_pblock(es);

		__entry->status	= ext4_es_status(es) >> 60;

		__entry->status	= ext4_es_status(es);

	),



	TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %s",
@@ -2289,7 +2289,7 @@ TRACE_EVENT(ext4_es_find_delayed_extent_range_exit, 
		__entry->lblk	= es->es_lblk;

		__entry->len	= es->es_len;

		__entry->pblk	= ext4_es_pblock(es);

		__entry->status	= ext4_es_status(es) >> 60;

		__entry->status	= ext4_es_status(es);

	),



	TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %s",
@@ -2343,7 +2343,7 @@ TRACE_EVENT(ext4_es_lookup_extent_exit, 
		__entry->lblk	= es->es_lblk;

		__entry->len	= es->es_len;

		__entry->pblk	= ext4_es_pblock(es);

		__entry->status	= ext4_es_status(es) >> 60;

		__entry->status	= ext4_es_status(es);

		__entry->found	= found;

	),