[Bug 201461] ext4 journal stalls write system call

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https://bugzilla.kernel.org/show_bug.cgi?id=201461

Theodore Tso (tytso@xxxxxxx) changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@xxxxxxx

--- Comment #1 from Theodore Tso (tytso@xxxxxxx) ---
It shouldn't be the case that the journal's data=ordered writeback would be
taking the i_data semaphore for writing.   

I'm guessing what is happening is that journal is causing a lot of I/O
operations because of data=ordered mode (e.g., not data=writeback), and this is
delaying a read which a writeback thread was trying to do while it was holding
a write lock on the inode's semaphore.

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