N Balachandran b3c2116d99 cluster/dht: Do not try to use up the readdirp buffer
DHT attempts to use up the entire buffer in readdirp before
unwinding in an attempt to reduce the number of calls.
However, this has 2 disadvantages:
1. This can cause a stack overflow when parallel readdir
is enabled. If the buffer only has a little space,rda can send back
only one or two entries. If those entries are stripped out by
dht_readdirp_cbk (linkto files for example) it will once again
wind down to rda in an attempt to fill the buffer before unwinding to FUSE.
This process can continue for several iterations, causing the stack
to grow and eventually overflow, causing the process to crash.
2. If parallel readdir is disabled, dht could send readdirp
calls with small buffers to the bricks, thus increasing the
number of network calls.

We are therefore reverting to the existing behaviour.
Please note, this only mitigates the stack overflow, it does
not prevent it from happening. This is still possible if
a subvol has thousands of linkto files for instance.

Change-Id: I291bc181c5249762d0c4fe27fa4fc2631166adf5
fixes: bz#1593548
Signed-off-by: N Balachandran <nbalacha@redhat.com>
2018-06-29 11:10:47 +00:00
2018-06-14 14:50:16 +00:00
2018-05-08 00:17:20 +00:00
2010-03-12 04:09:34 -08:00
2017-09-07 11:42:08 +00:00
2017-11-08 11:10:44 +00:00
2018-06-21 05:41:47 +00:00
2011-07-18 17:24:14 +05:30
2017-09-07 11:42:08 +00:00
2014-09-16 02:30:36 -07:00

Gluster

Gluster is a software defined distributed storage that can scale to several petabytes. It provides interfaces for object, block and file storage.

Development

Contributions to gluster in the form of patches and new feature additions can be made by following steps outlined at Developers Guide.

Documentation

The Gluster documentation can be found at Gluster Docs.

Deployment

Quick instructions to build and install can be found in INSTALL file.

Maintainers

The list of Gluster maintainers is available in MAINTAINERS file.

License

Gluster is dual licensed under GPLV2 and LGPLV3+.

Please visit the Gluster Home Page to find out more about Gluster.

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