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>
diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
index 5b7f741..24f0340 100644
--- a/fs/quota/quota_tree.c
+++ b/fs/quota/quota_tree.c
@@ -60,9 +60,17 @@
static ssize_t write_blk(struct qtree_mem_dqinfo *info, uint blk, char *buf)
{
struct super_block *sb = info->dqi_sb;
+ ssize_t ret;
- return sb->s_op->quota_write(sb, info->dqi_type, buf,
+ ret = sb->s_op->quota_write(sb, info->dqi_type, buf,
info->dqi_usable_bs, blk << info->dqi_blocksize_bits);
+ if (ret != info->dqi_usable_bs) {
+ q_warn(KERN_WARNING "VFS: dquota write failed on "
+ "dev %s\n", sb->s_id);
+ if (ret >= 0)
+ ret = -EIO;
+ }
+ return ret;
}
/* Remove empty block from list and return it */
@@ -152,7 +160,7 @@
dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0);
/* No matter whether write succeeds block is out of list */
if (write_blk(info, blk, buf) < 0)
- printk(KERN_ERR
+ q_warn(KERN_ERR
"VFS: Can't write block (%u) with free entries.\n",
blk);
return 0;
@@ -244,7 +252,7 @@
if (le16_to_cpu(dh->dqdh_entries) + 1 >= qtree_dqstr_in_blk(info)) {
*err = remove_free_dqentry(info, buf, blk);
if (*err < 0) {
- printk(KERN_ERR "VFS: find_free_dqentry(): Can't "
+ q_warn(KERN_ERR "VFS: find_free_dqentry(): Can't "
"remove block (%u) from entry free list.\n",
blk);
goto out_buf;
@@ -268,7 +276,7 @@
#endif
*err = write_blk(info, blk, buf);
if (*err < 0) {
- printk(KERN_ERR "VFS: find_free_dqentry(): Can't write quota "
+ q_warn(KERN_ERR "VFS: find_free_dqentry(): Can't write quota "
"data block %u.\n", blk);
goto out_buf;
}
@@ -303,7 +311,7 @@
} else {
ret = read_blk(info, *treeblk, buf);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read tree quota block "
+ q_warn(KERN_ERR "VFS: Can't read tree quota block "
"%u.\n", *treeblk);
goto out_buf;
}
@@ -365,7 +373,7 @@
if (!dquot->dq_off) {
ret = dq_insert_tree(info, dquot);
if (ret < 0) {
- printk(KERN_ERR "VFS: Error %zd occurred while "
+ q_warn(KERN_ERR "VFS: Error %zd occurred while "
"creating quota.\n", ret);
kfree(ddquot);
return ret;
@@ -377,7 +385,7 @@
ret = sb->s_op->quota_write(sb, type, ddquot, info->dqi_entry_size,
dquot->dq_off);
if (ret != info->dqi_entry_size) {
- printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
+ q_warn(KERN_WARNING "VFS: dquota write failed on dev %s\n",
sb->s_id);
if (ret >= 0)
ret = -ENOSPC;
@@ -402,14 +410,14 @@
if (!buf)
return -ENOMEM;
if (dquot->dq_off >> info->dqi_blocksize_bits != blk) {
- printk(KERN_ERR "VFS: Quota structure has offset to other "
+ q_warn(KERN_ERR "VFS: Quota structure has offset to other "
"block (%u) than it should (%u).\n", blk,
(uint)(dquot->dq_off >> info->dqi_blocksize_bits));
goto out_buf;
}
ret = read_blk(info, blk, buf);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota data block %u\n", blk);
+ q_warn(KERN_ERR "VFS: Can't read quota data block %u\n", blk);
goto out_buf;
}
dh = (struct qt_disk_dqdbheader *)buf;
@@ -419,7 +427,7 @@
if (ret >= 0)
ret = put_free_dqblk(info, buf, blk);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't move quota data block (%u) "
+ q_warn(KERN_ERR "VFS: Can't move quota data block (%u) "
"to free list.\n", blk);
goto out_buf;
}
@@ -432,14 +440,14 @@
/* Insert will write block itself */
ret = insert_free_dqentry(info, buf, blk);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't insert quota data "
+ q_warn(KERN_ERR "VFS: Can't insert quota data "
"block (%u) to free entry list.\n", blk);
goto out_buf;
}
} else {
ret = write_blk(info, blk, buf);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't write quota data "
+ q_warn(KERN_ERR "VFS: Can't write quota data "
"block %u\n", blk);
goto out_buf;
}
@@ -464,7 +472,7 @@
return -ENOMEM;
ret = read_blk(info, *blk, buf);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota data block %u\n", *blk);
+ q_warn(KERN_ERR "VFS: Can't read quota data block %u\n", *blk);
goto out_buf;
}
newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
@@ -488,7 +496,7 @@
} else {
ret = write_blk(info, *blk, buf);
if (ret < 0)
- printk(KERN_ERR "VFS: Can't write quota tree "
+ q_warn(KERN_ERR "VFS: Can't write quota tree "
"block %u.\n", *blk);
}
}
@@ -521,7 +529,7 @@
return -ENOMEM;
ret = read_blk(info, blk, buf);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
+ q_warn(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
goto out_buf;
}
ddquot = buf + sizeof(struct qt_disk_dqdbheader);
@@ -531,7 +539,7 @@
ddquot += info->dqi_entry_size;
}
if (i == qtree_dqstr_in_blk(info)) {
- printk(KERN_ERR "VFS: Quota for id %u referenced "
+ q_warn(KERN_ERR "VFS: Quota for id %u referenced "
"but not present.\n", dquot->dq_id);
ret = -EIO;
goto out_buf;
@@ -556,7 +564,7 @@
return -ENOMEM;
ret = read_blk(info, blk, buf);
if (ret < 0) {
- printk(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
+ q_warn(KERN_ERR "VFS: Can't read quota tree block %u.\n", blk);
goto out_buf;
}
ret = 0;
@@ -599,7 +607,7 @@
offset = find_dqentry(info, dquot);
if (offset <= 0) { /* Entry not present? */
if (offset < 0)
- printk(KERN_ERR "VFS: Can't read quota "
+ q_warn(KERN_ERR "VFS: Can't read quota "
"structure for id %u.\n", dquot->dq_id);
dquot->dq_off = 0;
set_bit(DQ_FAKE_B, &dquot->dq_flags);
@@ -617,7 +625,7 @@
if (ret != info->dqi_entry_size) {
if (ret >= 0)
ret = -EIO;
- printk(KERN_ERR "VFS: Error while reading quota "
+ q_warn(KERN_ERR "VFS: Error while reading quota "
"structure for id %u.\n", dquot->dq_id);
set_bit(DQ_FAKE_B, &dquot->dq_flags);
memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
diff --git a/fs/quota/quota_tree.h b/fs/quota/quota_tree.h
index a1ab8db..ccc3e71 100644
--- a/fs/quota/quota_tree.h
+++ b/fs/quota/quota_tree.h
@@ -22,4 +22,10 @@
#define QT_TREEOFF 1 /* Offset of tree in file in blocks */
+#define q_warn(fmt, args...) \
+do { \
+ if (printk_ratelimit()) \
+ printk(fmt, ## args); \
+} while(0)
+
#endif /* _LINUX_QUOTAIO_TREE_H */
diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index e3da02f4..135206a 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -63,7 +63,7 @@
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 @@
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 @@
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;
}
