dquot: Detect partial write error to quota file in write_blk() and add printk_ratelimit for quota error messages

This patch changes quota_tree.c:write_blk() to detect error caused by partial
write to quota file and add a macro to limit control printed quota error
messages so we won't fill up dmesg with a corrupted quota file.

Signed-off-by: Jiaying Zhang <jiayingz@google.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index e3da02f4986f..135206af1458 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -63,7 +63,7 @@ static int v2_read_header(struct super_block *sb, int type,
         size = sb->s_op->quota_read(sb, type, (char *)dqhead,
                                     sizeof(struct v2_disk_dqheader), 0);
         if (size != sizeof(struct v2_disk_dqheader)) {
-                printk(KERN_WARNING "quota_v2: Failed header read:"
+                q_warn(KERN_WARNING "quota_v2: Failed header read:"
                        " expected=%zd got=%zd\n",
                         sizeof(struct v2_disk_dqheader), size);
                 return 0;
@@ -106,7 +106,7 @@ static int v2_read_file_info(struct super_block *sb, int type)
         size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
                sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
         if (size != sizeof(struct v2_disk_dqinfo)) {
-                printk(KERN_WARNING "quota_v2: Can't read info structure on device %s.\n",
+                q_warn(KERN_WARNING "quota_v2: Can't read info structure on device %s.\n",
                         sb->s_id);
                 return -1;
         }
@@ -167,7 +167,7 @@ static int v2_write_file_info(struct super_block *sb, int type)
         size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
                sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
         if (size != sizeof(struct v2_disk_dqinfo)) {
-                printk(KERN_WARNING "Can't write info structure on device %s.\n",
+                q_warn(KERN_WARNING "Can't write info structure on device %s.\n",
                         sb->s_id);
                 return -1;
         }