[Bug 91903] New: limit write_queue size in char_device

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91903

            Bug ID: 91903
           Summary: limit write_queue size in char_device
           Product: Spice
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: server
          Assignee: spice-bugs at lists.freedesktop.org
          Reporter: bugzilla at victortoso.com

This bug is a complement of https://bugs.freedesktop.org/show_bug.cgi?id=91350

While doing file transfer using webdav, it is possible to reach huge amount of
memory usage on write-queue.

We should introduce a limit to the ring size.

Example in #91350
When transferring 320 MB file, the write-queue reached 240 MB.

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