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ext4: add a new ioctl EXT4_IOC_CLEAR_ES_CACHE

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The new ioctl EXT4_IOC_CLEAR_ES_CACHE will force an inode's extent
status cache to be cleared out.  This is intended for use for
debugging.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2019-08-11 16:30:41 -04:00
parent 547b9ad698
commit b0c013e292
4 changed files with 40 additions and 0 deletions
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28
fs/ext4/extents_status.c
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@@ -1374,6 +1374,34 @@ static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan)
return nr_shrunk;
}
/*
* Called to support EXT4_IOC_CLEAR_ES_CACHE. We can only remove
* discretionary entries from the extent status cache. (Some entries
* must be present for proper operations.)
*/
void ext4_clear_inode_es(struct inode *inode)
{
struct ext4_inode_info *ei = EXT4_I(inode);
struct extent_status *es;
struct ext4_es_tree *tree;
struct rb_node *node;
write_lock(&ei->i_es_lock);
tree = &EXT4_I(inode)->i_es_tree;
tree->cache_es = NULL;
node = rb_first(&tree->root);
while (node) {
es = rb_entry(node, struct extent_status, rb_node);
node = rb_next(node);
if (!ext4_es_is_delayed(es)) {
rb_erase(&es->rb_node, &tree->root);
ext4_es_free_extent(inode, es);
}
}
ext4_clear_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
write_unlock(&ei->i_es_lock);
}
#ifdef ES_DEBUG__
static void ext4_print_pending_tree(struct inode *inode)
{