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authorTheodore Ts'o <tytso@mit.edu>2016-03-30 22:36:24 -0400
committerTheodore Ts'o <tytso@mit.edu>2016-03-30 22:36:24 -0400
commit1028b55bafb7611dda1d8fed2aeca16a436b7dff (patch)
treec6881992855b87775897afe3712e6c72811856a0 /fs/ext4/namei.c
parentde17e793b104d690e1d007dfc5cb6b4f649598ca (diff)
downloadblackbird-op-linux-1028b55bafb7611dda1d8fed2aeca16a436b7dff.tar.gz
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ext4: allow readdir()'s of large empty directories to be interrupted
If a directory has a large number of empty blocks, iterating over all of them can take a long time, leading to scheduler warnings and users getting irritated when they can't kill a process in the middle of one of these long-running readdir operations. Fix this by adding checks to ext4_readdir() and ext4_htree_fill_tree(). Reported-by: Benjamin LaHaise <bcrl@kvack.org> Google-Bug-Id: 27880676 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 48e4b8907826..db98f89f737f 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1107,6 +1107,11 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
}
while (1) {
+ if (signal_pending(current)) {
+ err = -ERESTARTSYS;
+ goto errout;
+ }
+ cond_resched();
block = dx_get_block(frame->at);
ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
start_hash, start_minor_hash);
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