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fs/buffer.c: record blockdev write errors in super_block that it backs

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When syncing out a block device (a'la __sync_blockdev), any error
encountered will only be recorded in the bd_inode's mapping.  When the
blockdev contains a filesystem however, we'd like to also record the
error in the super_block that's stored there.

Make mark_buffer_write_io_error also record the error in the
corresponding super_block when a writeback error occurs and the block
device contains a mounted superblock.

Since superblocks are RCU freed, hold the rcu_read_lock to ensure that
the superblock doesn't go away while we're marking it.

Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: David Howells <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Dave Chinner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jeff Layton authored and Linus Torvalds committed 2020-06-02 10:59:05 -07:00
1 parent 735e4ae5ba
commit 485e9605c0
1 file changed
+7
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fs/buffer.c
+7
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@@ -1154,12 +1154,19 @@ EXPORT_SYMBOL(mark_buffer_dirty);
void mark_buffer_write_io_error(struct buffer_head *bh)
{
struct super_block *sb;
set_buffer_write_io_error(bh);
/* FIXME: do we need to set this in both places? */
if (bh->b_page && bh->b_page->mapping)
mapping_set_error(bh->b_page->mapping, -EIO);
if (bh->b_assoc_map)
mapping_set_error(bh->b_assoc_map, -EIO);
rcu_read_lock();
sb = READ_ONCE(bh->b_bdev->bd_super);
if (sb)
errseq_set(&sb->s_wb_err, -EIO);
rcu_read_unlock();
}
EXPORT_SYMBOL(mark_buffer_write_io_error);