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authorAnand Avati <avati@redhat.com>2013-04-03 16:31:07 -0700
committerAnand Avati <avati@redhat.com>2013-05-07 11:54:33 -0700
commit5ac55756cd923e4bb1e5b5df50aeaf198d5531b7 (patch)
tree24b00ec6b985ad9a4caf8253d8d55eb491356931 /xlators/system
parentf00720f3ed760f018d8c847476563a5eb1b111a3 (diff)
posix: fix dangerous "sharing" of fd in readdir between two requestsv3.4.0beta1
posix_fill_readdir() is a multi-step function which performs many readdir() calls, and expects the directory cursor to have not "seeked away" elsewhere between two successive iterations. Usually this is not a problem as each opendir() from an application has its own backend fd, and there is nobody else to "seek away" the directory cursor. However in case of NFS's use of anonymous fd, the same fd_t is shared between all NFS readdir requests, and two readdir loops can be executing in parallel on the same dir dragging away the cursor in a chaotic manner. The fix in this patch is to lock on the fd around the loop. Another approach could be to reimplement posix_fill_readdir() with a single getdents() call, but that's for another day. Change-Id: Ia42e9c7fbcde43af4c0d08c20cc0f7419b98bd3f BUG: 948086 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/4774 Reviewed-by: Jeff Darcy <jdarcy@redhat.com> Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-on: http://review.gluster.org/4963
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