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Btrfs: add file item tracepoints

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While debugging truncate problems, I found that these tracepoints could
help us quickly know what went wrong.

Two sets of tracepoints are created to track regular/prealloc file item
and inline file item respectively, I put inline as a separate one since
what inline file items cares about are way less than the regular one.

This adds four tracepoints:
- btrfs_get_extent_show_fi_regular
- btrfs_get_extent_show_fi_inline
- btrfs_truncate_show_fi_regular
- btrfs_truncate_show_fi_inline

Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ formatting adjustments ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-03-10 11:09:48 -08:00 • committed by David Sterba
parent dec95574f4
commit 09ed2f165c
2 changed files with 154 additions and 0 deletions
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15
fs/btrfs/inode.c
View file

@ -4401,9 +4401,17 @@ search_again:
if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
item_end +=
btrfs_file_extent_num_bytes(leaf, fi);
trace_btrfs_truncate_show_fi_regular(
BTRFS_I(inode), leaf, fi,
found_key.offset);
} else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
item_end += btrfs_file_extent_inline_len(leaf,
path->slots[0], fi);
trace_btrfs_truncate_show_fi_inline(
BTRFS_I(inode), leaf, fi, path->slots[0],
found_key.offset);
}
item_end--;
}
@ -6828,11 +6836,18 @@ again:
found_type == BTRFS_FILE_EXTENT_PREALLOC) {
extent_end = extent_start +
btrfs_file_extent_num_bytes(leaf, item);
trace_btrfs_get_extent_show_fi_regular(inode, leaf, item,
extent_start);
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
size_t size;
size = btrfs_file_extent_inline_len(leaf, path->slots[0], item);
extent_end = ALIGN(extent_start + size,
fs_info->sectorsize);
trace_btrfs_get_extent_show_fi_inline(inode, leaf, item,
path->slots[0],
extent_start);
}
next:
if (start >= extent_end) {