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kern_execve() locks text vnode exclusive to be able to set and clear VV_TEXT flag. VV_TEXT is mutually exclusive with the v_writecount > 0 condition. The change removes VV_TEXT, replacing it with the condition v_writecount <= -1, and puts v_writecount under the vnode interlock. Each text reference decrements v_writecount. To clear the text reference when the segment is unmapped, it is recorded in the vm_map_entry backed by the text file as MAP_ENTRY_VN_TEXT flag, and v_writecount is incremented on the map entry removal The operations like VOP_ADD_WRITECOUNT() and VOP_SET_TEXT() check that v_writecount does not contradict the desired change. vn_writecheck() is now racy and its use was eliminated everywhere except access. Atomic check for writeability and increment of v_writecount is performed by the VOP. vn_truncate() now increments v_writecount around VOP_SETATTR() call, lack of which is arguably a bug on its own. nullfs bypasses v_writecount to the lower vnode always, so nullfs vnode has its own v_writecount correct, and lower vnode gets all references, since object->handle is always lower vnode. On the text vnode' vm object dealloc, the v_writecount value is reset to zero, and deadfs vop_unset_text short-circuit the operation. Reclamation of lowervp always reclaims all nullfs vnodes referencing lowervp first, so no stray references are left. Reviewed by: markj, trasz Tested by: mjg, pho Sponsored by: The FreeBSD Foundation MFC after: 1 month Differential revision: https://reviews.freebsd.org/D19923 |
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| blacklistd-helper | ||
| bootpd | ||
| comsat | ||
| dma | ||
| fingerd | ||
| ftpd | ||
| getty | ||
| hyperv | ||
| mail.local | ||
| makewhatis.local | ||
| mknetid | ||
| pppoed | ||
| rbootd | ||
| rc | ||
| revnetgroup | ||
| rpc.rquotad | ||
| rpc.rstatd | ||
| rpc.rusersd | ||
| rpc.rwalld | ||
| rpc.sprayd | ||
| rtld-aout | ||
| rtld-elf | ||
| save-entropy | ||
| smrsh | ||
| talkd | ||
| tcpd | ||
| telnetd | ||
| tests | ||
| tftp-proxy | ||
| tftpd | ||
| ulog-helper | ||
| ypxfr | ||
| Makefile | ||
| Makefile.amd64 | ||
| Makefile.i386 | ||
| Makefile.inc | ||