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Subject[PATCH] autofs: don't stuck in a loop if vfs_write returns an error
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From: Andrey Vagin <avagin@openvz.org>

__vfs_write() returns a negative value in a error case.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Ian Kent <raven@themaw.net>
---
fs/autofs4/waitq.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 0146d91..631f155 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -66,11 +66,12 @@ static int autofs4_write(struct autofs_sb_info *sbi,
set_fs(KERNEL_DS);

mutex_lock(&sbi->pipe_mutex);
- wr = __vfs_write(file, data, bytes, &file->f_pos);
- while (bytes && wr) {
+ while (bytes) {
+ wr = __vfs_write(file, data, bytes, &file->f_pos);
+ if (wr <= 0)
+ break;
data += wr;
bytes -= wr;
- wr = __vfs_write(file, data, bytes, &file->f_pos);
}
mutex_unlock(&sbi->pipe_mutex);

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