From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
A per-cpu counter is defined to store io types in ext4. We define 10 io types
in ext4, which includes 9 metadata types and 1 data type. Read and write
operations are counted separately. When checks 'Issue' flag, filesystem needs
to lock buffer.
Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Signed-off-by: Wang Shaoyan <wangshaoyan.pt@xxxxxxxxxx>
---
fs/ext4/ext4.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ext4/super.c | 19 +++++++++++++++++++
2 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 5b0e26a..39a1495 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1108,6 +1108,23 @@ struct ext4_super_block {
#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
/*
+ * ext4 io types
+ */
+enum {
+ EXT4_IOS_SUPER_BLOCK = 0,
+ EXT4_IOS_GROUP_DESC,
+ EXT4_IOS_INODE_BITMAP,
+ EXT4_IOS_BLOCK_BITMAP,
+ EXT4_IOS_INODE_TABLE,
+ EXT4_IOS_EXTENT_BLOCK,
+ EXT4_IOS_INDIRECT_BLOCK,
+ EXT4_IOS_DIR_ENTRY,
+ EXT4_IOS_EXTENDED_ATTR,
+ EXT4_IOS_REGULAR_DATA,
+ EXT4_IOS_TYPE_END,
+};
+
+/*
* fourth extended-fs super-block data in memory
*/
struct ext4_sb_info {
@@ -1284,6 +1301,11 @@ static inline void ext4_set_io_unwritten_flag(struct inode *inode,
}
}
+static inline unsigned ext4_blocks_per_page(struct inode *inode)
+{
+ return PAGE_CACHE_SIZE >> inode->i_blkbits;
+}
+
/*
* Inode dynamic state flags
*/
@@ -1926,6 +1948,37 @@ extern int ext4_group_extend(struct super_block *sb,
ext4_fsblk_t n_blocks_count);
/* super.c */
+extern void __ext4_io_stat(int, int, unsigned long);
+#define ext4_ios_read(bh, type, count) \
+ do { \
+ if (!bh) \
+ break; \
+ lock_buffer(bh); \
+ if (buffer_issue(bh)) { \
+ clear_buffer_issue(bh); \
+ __ext4_io_stat(READ, type, count); \
+ } \
+ unlock_buffer(bh); \
+ } while (0)
+#define ext4_ios_write(handle, bh, type, count) \
+ do { \
+ if (!bh) { \
+ __ext4_io_stat(WRITE, type, count); \
+ break; \
+ } \
+ if (!handle || !ext4_handle_valid(handle)) { \
+ if (buffer_dirty(bh)) \
+ break; \
+ } else { \
+ if (buffer_jbddirty(bh)) \
+ break; \
+ } \
+ __ext4_io_stat(WRITE, type, count); \
+ } while(0)
+#define ext4_ios_read_one(bh, type) ext4_ios_read(bh, type, 1)
+#define ext4_ios_write_one(handle, bh, type) \
+ ext4_ios_write(handle, bh, type, 1)
+
extern void *ext4_kvmalloc(size_t size, gfp_t flags);
extern void *ext4_kvzalloc(size_t size, gfp_t flags);
extern void ext4_kvfree(void *ptr);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9953d80..3bec50c 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4940,6 +4940,25 @@ out:
#endif
+static DEFINE_PER_CPU(unsigned long [EXT4_IOS_TYPE_END][2], ext4_ios_counters);
+
+static inline unsigned long ext4_get_ios_counter(int rw, int type)
+{
+ unsigned long sum = 0;
+ int i;
+
+ for_each_possible_cpu(i)
+ sum += per_cpu(ext4_ios_counters[type][rw], i);
+
+ return sum;
+}
+
+void __ext4_io_stat(int rw, int type, unsigned long count)
+{
+ BUG_ON(type < 0 || type >= EXT4_IOS_TYPE_END);
+ this_cpu_add(ext4_ios_counters[type][rw], count);
+}
+
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
--
1.7.4.1
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