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| author | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:30:41 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:30:41 -0400 |
| commit | b0c013e2928d3696ceb6401311dbc1d7fcccd6dd (patch) | |
| tree | 673e10bc5de72eab8f375f913df207ccf6a3afea /fs/ext4/extents_status.c | |
| parent | 547b9ad698b434eadca46319cb47e5875b55ef03 (diff) | |
| download | linux-b0c013e2928d3696ceb6401311dbc1d7fcccd6dd.tar.gz | |
ext4: add a new ioctl EXT4_IOC_CLEAR_ES_CACHE
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>
Diffstat (limited to 'fs/ext4/extents_status.c')
| -rw-r--r-- | fs/ext4/extents_status.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index 7521de2dcf3ae..02cc8eb3eb0e1 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -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) { |