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ext4: Add support FALLOC_FL_INSERT_RANGE for fallocate

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This patch implements fallocate's FALLOC_FL_INSERT_RANGE for Ext4.

1) Make sure that both offset and len are block size aligned.
2) Update the i_size of inode by len bytes.
3) Compute the file's logical block number against offset. If the computed
   block number is not the starting block of the extent, split the extent
   such that the block number is the starting block of the extent.
4) Shift all the extents which are lying between [offset, last allocated extent]
   towards right by len bytes. This step will make a hole of len bytes
   at offset.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
This commit is contained in:
Namjae Jeon 2015-06-09 01:55:03 -04:00 • committed by Theodore Ts'o
commit 331573febb
3 changed files with 292 additions and 52 deletions
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25
include/trace/events/ext4.h
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@ -2478,6 +2478,31 @@ TRACE_EVENT(ext4_collapse_range,
__entry->offset, __entry->len)
);
TRACE_EVENT(ext4_insert_range,
TP_PROTO(struct inode *inode, loff_t offset, loff_t len),
TP_ARGS(inode, offset, len),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
__field(loff_t, offset)
__field(loff_t, len)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->offset = offset;
__entry->len = len;
),
TP_printk("dev %d,%d ino %lu offset %lld len %lld",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino,
__entry->offset, __entry->len)
);
TRACE_EVENT(ext4_es_shrink,
TP_PROTO(struct super_block *sb, int nr_shrunk, u64 scan_time,
int nr_skipped, int retried),