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ext4: add two trace points for moving extents 

To facilitate tracking the length, type, and outcome of the move extent,
add a trace point at both the entry and exit of mext_move_extent().

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-ID: <20251013015128.499308-13-yi.zhang@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Zhang Yi 2025-10-13 09:51:28 +08:00 committed by Theodore Ts'o
parent 65097262f5
commit 9dbf945320
2 changed files with 86 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/ext4/move_extent.c
View File

@ -13,6 +13,8 @@
#include "ext4.h"
#include "ext4_extents.h"
#include <trace/events/ext4.h>
struct mext_data {
struct inode *orig_inode; /* Origin file inode */
struct inode *donor_inode; /* Donor file inode */
@ -311,10 +313,14 @@ static int mext_move_extent(struct mext_data *mext, u64 *m_len)
int ret, ret2;
*m_len = 0;
trace_ext4_move_extent_enter(orig_inode, orig_map, donor_inode,
mext->donor_lblk);
credits = ext4_chunk_trans_extent(orig_inode, 0) * 2;
handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, credits);
if (IS_ERR(handle))
return PTR_ERR(handle);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
}
ret = mext_move_begin(mext, folio, &move_type);
if (ret)
@ -379,6 +385,10 @@ static int mext_move_extent(struct mext_data *mext, u64 *m_len)
mext_folio_double_unlock(folio);
stop_handle:
ext4_journal_stop(handle);
out:
trace_ext4_move_extent_exit(orig_inode, orig_map->m_lblk, donor_inode,
mext->donor_lblk, orig_map->m_len, *m_len,
move_type, ret);
return ret;
repair_branches:

74
include/trace/events/ext4.h
View File

@ -3016,6 +3016,80 @@ TRACE_EVENT(ext4_update_sb,
__entry->fsblk, __entry->flags)
);
TRACE_EVENT(ext4_move_extent_enter,
TP_PROTO(struct inode *orig_inode, struct ext4_map_blocks *orig_map,
struct inode *donor_inode, ext4_lblk_t donor_lblk),
TP_ARGS(orig_inode, orig_map, donor_inode, donor_lblk),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, orig_ino)
__field(ext4_lblk_t, orig_lblk)
__field(unsigned int, orig_flags)
__field(ino_t, donor_ino)
__field(ext4_lblk_t, donor_lblk)
__field(unsigned int, len)
),
TP_fast_assign(
__entry->dev = orig_inode->i_sb->s_dev;
__entry->orig_ino = orig_inode->i_ino;
__entry->orig_lblk = orig_map->m_lblk;
__entry->orig_flags = orig_map->m_flags;
__entry->donor_ino = donor_inode->i_ino;
__entry->donor_lblk = donor_lblk;
__entry->len = orig_map->m_len;
),
TP_printk("dev %d,%d origin ino %lu lblk %u flags %s donor ino %lu lblk %u len %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->orig_ino, __entry->orig_lblk,
show_mflags(__entry->orig_flags),
(unsigned long) __entry->donor_ino, __entry->donor_lblk,
__entry->len)
);
TRACE_EVENT(ext4_move_extent_exit,
TP_PROTO(struct inode *orig_inode, ext4_lblk_t orig_lblk,
struct inode *donor_inode, ext4_lblk_t donor_lblk,
unsigned int m_len, u64 move_len, int move_type, int ret),
TP_ARGS(orig_inode, orig_lblk, donor_inode, donor_lblk, m_len,
move_len, move_type, ret),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, orig_ino)
__field(ext4_lblk_t, orig_lblk)
__field(ino_t, donor_ino)
__field(ext4_lblk_t, donor_lblk)
__field(unsigned int, m_len)
__field(u64, move_len)
__field(int, move_type)
__field(int, ret)
),
TP_fast_assign(
__entry->dev = orig_inode->i_sb->s_dev;
__entry->orig_ino = orig_inode->i_ino;
__entry->orig_lblk = orig_lblk;
__entry->donor_ino = donor_inode->i_ino;
__entry->donor_lblk = donor_lblk;
__entry->m_len = m_len;
__entry->move_len = move_len;
__entry->move_type = move_type;
__entry->ret = ret;
),
TP_printk("dev %d,%d origin ino %lu lblk %u donor ino %lu lblk %u m_len %u, move_len %llu type %d ret %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->orig_ino, __entry->orig_lblk,
(unsigned long) __entry->donor_ino, __entry->donor_lblk,
__entry->m_len, __entry->move_len, __entry->move_type,
__entry->ret)
);
#endif /* _TRACE_EXT4_H */
/* This part must be outside protection */