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Subject[PATCH 4/5] vfs: allow fsinfo to fetch the current state of s_wb_err
Date
From: Jeff Layton <jlayton@redhat.com>

Add a new "error_state" struct to fsinfo, and teach the kernel to fill
that out from sb->s_wb_info. There are two fields:

wb_error_last: the most recently recorded errno for the filesystem

wb_error_cookie: this value will change vs. the previously fetched
value if a new error was recorded since it was last
checked

Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
fs/statfs.c | 9 +++++++++
include/uapi/linux/fsinfo.h | 11 +++++++++++
2 files changed, 20 insertions(+)

diff --git a/fs/statfs.c b/fs/statfs.c
index f996ab6af44f..df8f1a1166c0 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -576,6 +576,14 @@ static int fsinfo_generic_io_size(struct dentry *dentry,
return sizeof(*c);
}

+static int fsinfo_generic_error_state(struct dentry *dentry,
+ struct fsinfo_error_state *c)
+{
+ c->wb_error_cookie = errseq_scrape(&dentry->d_sb->s_wb_err);
+ c->wb_error_last = c->wb_error_cookie & MAX_ERRNO;
+ return sizeof(*c);
+}
+
/*
* Implement some queries generically from stuff in the superblock.
*/
@@ -594,6 +602,7 @@ int generic_fsinfo(struct dentry *dentry, struct fsinfo_kparams *params)
case _gen(volume_id);
case _gen(name_encoding);
case _gen(io_size);
+ case _gen(error_state);
default:
return -EOPNOTSUPP;
}
diff --git a/include/uapi/linux/fsinfo.h b/include/uapi/linux/fsinfo.h
index a6758e71f0c7..a0c6e0e18e8a 100644
--- a/include/uapi/linux/fsinfo.h
+++ b/include/uapi/linux/fsinfo.h
@@ -35,6 +35,7 @@ enum fsinfo_attribute {
fsinfo_attr_name_encoding = 17, /* Filename encoding (string) */
fsinfo_attr_name_codepage = 18, /* Filename codepage (string) */
fsinfo_attr_io_size = 19, /* Optimal I/O sizes */
+ fsinfo_attr_error_state = 20, /* Error state */
fsinfo_attr__nr
};

@@ -209,6 +210,16 @@ struct fsinfo_server_address {
struct __kernel_sockaddr_storage address;
};

+/*
+ * Information struct for fsinfo(fsinfo_attr_error_state).
+ *
+ * Retrieve the error state for a filesystem.
+ */
+struct fsinfo_error_state {
+ __u32 wb_error_cookie; /* writeback error cookie */
+ __u32 wb_error_last; /* latest writeback error */
+};
+
/*
* Information struct for fsinfo(fsinfo_attr_io_size).
*
--
2.17.0
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