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ext4: support GETFSMAP ioctls

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Support the GETFSMAP ioctls so that we can use the xfs free space
management tools to probe ext4 as well.  Note that this is a partial
implementation -- we only report fixed-location metadata and free space;
everything else is reported as "unknown".

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Darrick J. Wong
2017-04-30 00:36:53 -04:00
committed by Theodore Ts'o
parent d0649f0416
commit 0c9ec4beec
8 changed files with 1027 additions and 5 deletions
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74
include/trace/events/ext4.h
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@@ -15,6 +15,7 @@ struct ext4_inode_info;
struct mpage_da_data;
struct ext4_map_blocks;
struct extent_status;
struct ext4_fsmap;
#define EXT4_I(inode) (container_of(inode, struct ext4_inode_info, vfs_inode))
@@ -2529,6 +2530,79 @@ TRACE_EVENT(ext4_es_shrink,
__entry->scan_time, __entry->nr_skipped, __entry->retried)
);
/* fsmap traces */
DECLARE_EVENT_CLASS(ext4_fsmap_class,
TP_PROTO(struct super_block *sb, u32 keydev, u32 agno, u64 bno, u64 len,
u64 owner),
TP_ARGS(sb, keydev, agno, bno, len, owner),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(dev_t, keydev)
__field(u32, agno)
__field(u64, bno)
__field(u64, len)
__field(u64, owner)
),
TP_fast_assign(
__entry->dev = sb->s_bdev->bd_dev;
__entry->keydev = new_decode_dev(keydev);
__entry->agno = agno;
__entry->bno = bno;
__entry->len = len;
__entry->owner = owner;
),
TP_printk("dev %d:%d keydev %d:%d agno %u bno %llu len %llu owner %lld\n",
MAJOR(__entry->dev), MINOR(__entry->dev),
MAJOR(__entry->keydev), MINOR(__entry->keydev),
__entry->agno,
__entry->bno,
__entry->len,
__entry->owner)
)
#define DEFINE_FSMAP_EVENT(name) \
DEFINE_EVENT(ext4_fsmap_class, name, \
TP_PROTO(struct super_block *sb, u32 keydev, u32 agno, u64 bno, u64 len, \
u64 owner), \
TP_ARGS(sb, keydev, agno, bno, len, owner))
DEFINE_FSMAP_EVENT(ext4_fsmap_low_key);
DEFINE_FSMAP_EVENT(ext4_fsmap_high_key);
DEFINE_FSMAP_EVENT(ext4_fsmap_mapping);
DECLARE_EVENT_CLASS(ext4_getfsmap_class,
TP_PROTO(struct super_block *sb, struct ext4_fsmap *fsmap),
TP_ARGS(sb, fsmap),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(dev_t, keydev)
__field(u64, block)
__field(u64, len)
__field(u64, owner)
__field(u64, flags)
),
TP_fast_assign(
__entry->dev = sb->s_bdev->bd_dev;
__entry->keydev = new_decode_dev(fsmap->fmr_device);
__entry->block = fsmap->fmr_physical;
__entry->len = fsmap->fmr_length;
__entry->owner = fsmap->fmr_owner;
__entry->flags = fsmap->fmr_flags;
),
TP_printk("dev %d:%d keydev %d:%d block %llu len %llu owner %lld flags 0x%llx\n",
MAJOR(__entry->dev), MINOR(__entry->dev),
MAJOR(__entry->keydev), MINOR(__entry->keydev),
__entry->block,
__entry->len,
__entry->owner,
__entry->flags)
)
#define DEFINE_GETFSMAP_EVENT(name) \
DEFINE_EVENT(ext4_getfsmap_class, name, \
TP_PROTO(struct super_block *sb, struct ext4_fsmap *fsmap), \
TP_ARGS(sb, fsmap))
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_low_key);
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_high_key);
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_mapping);
#endif /* _TRACE_EXT4_H */
/* This part must be outside protection */