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| author | Theodore Ts'o <tytso@mit.edu> | 2016-03-31 05:36:24 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-03-31 05:36:24 +0300 |
| commit | 1028b55bafb7611dda1d8fed2aeca16a436b7dff (patch) | |
| tree | c6881992855b87775897afe3712e6c72811856a0 /fs/ext4/namei.c | |
| parent | de17e793b104d690e1d007dfc5cb6b4f649598ca (diff) | |
| download | linux-1028b55bafb7611dda1d8fed2aeca16a436b7dff.tar.xz | |
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.c | 5 |
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); |