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Default branch: MAIN
Current tag: netbsd-5-2-2-RELEASE
Revision 126.96.36.199 / (download) - annotate - [select for diffs], Sat Sep 17 18:53:29 2011 UTC (7 years ago) by bouyer
CVS Tags: netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2
Changes since 188.8.131.52: +3 -1 lines
Diff to previous 184.108.40.206 (colored) to branchpoint 1.70 (colored) next main 1.71 (colored)
Pull up following revision(s) (requested by manu in ticket #1666): sys/fs/puffs/puffs_sys.h: revision 1.78 via patch sys/fs/puffs/puffs_node.c: revision 1.20 via patch sys/fs/puffs/puffs_vnops.c: revision 1.155 via patch Add a mutex for operations that touch size (setattr, getattr, write, fsync). This is required to avoid data corruption bugs, where a getattr slices itself within a setattr operation, and sets the size to the stall value it got from the filesystem. That value is smaller than the one set by setattr, and the call to uvm_vnp_setsize() trigged a spurious truncate. The result is a chunk of zeroed data in the file. Such a situation can easily happen when the ioflush thread issue a VOP_FSYNC/puffs_vnop_sync/flushvncache/dosetattrn while andother process do a sys_stat/VOP_GETATTR/puffs_vnop_getattr. This mutex on size operation can be removed the day we decide VOP_GETATTR has to operated on a locked vnode, since the other operations that touch size already require that.
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