porting tmpfs

看板DFBSD_kernel作者a63fvb48.時間16年前 (2009/11/14 19:01)推噓0(0推 0噓 0→)

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--0016368e1b105cfbfc04785264f4 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Hi. In July, I=92ve fixed file truncating bug. The problem was the lack of a call to vtruncbuf() in tmpfs_reg_resize(). Now tmpfs survives testing with fsx and fsstress. But also I found some bug at fsstress.c: in function creat_f() line 1684 "add_to_flist(type, id, parid);" must be after the following line "#endif". Without this change fsstress does not remember files that it is created and no reading/writing is performed. (=93no filename=94 error is displayed in verbose mode.) Also I don=92t understand why Alex Hornung has removed tmpfs_spec_vnops. Without adding this ops call to mknod() ends with panic. (I have to run fsstress with option =93=96f mknod=3D0=94.) Next I tried to use objcache instead of plain kmalloc() to allocate tmpfs nodes and direntries. But when objcache is destroyed during unmount, there is a crit_panic "td_pri is/would-go negative! -26" caused by mag_purge() calling crit_exit() at objcache.c. It seems that mag_purge() is not called from the critical section as it is expected. tmpfs now really takes double memory space. I tried to implement page moving between VM objects but I=92ve never seen buffer passed to tmpfs_strategy() with B_RELBUF set. All my attempts to modify buffer flags in tmpfs_read() end with global deadlock. 2 diffs to Alex Hornung's tree are attached: first uses kmalloc(), second uses objcache. --0016368e1b105cfbfc04785264f4 Content-Type: application/octet-stream; name="tmpfs.diff" Content-Disposition: attachment; filename="tmpfs.diff" Content-Transfer-Encoding: base64 X-Attachment-Id: f_g2084zzz0 ZGlmZiAtLWdpdCBhL3N5cy92ZnMvdG1wZnMvdG1wZnMuaCBiL3N5cy92ZnMvdG1wZnMvdG1wZnMu aAppbmRleCAyOTRjMTg3Li45YWRiMjkzCi0tLSBhL3N5cy92ZnMvdG1wZnMvdG1wZnMuaAorKysg Yi9zeXMvdmZzL3RtcGZzL3RtcGZzLmgKQEAgLTcwLDE2ICs3MCwxNiBAQCBNQUxMT0NfREVDTEFS RShNX1RNUEZTKTsKICNkZWZpbmUga211dGV4X3QJCXN0cnVjdCBsb2NrCiAKICNkZWZpbmUgbXV0 ZXhfaW5pdChtdHgsIGEsIGIpCWxvY2tpbml0KG10eCwgIm11dGV4IiwgMCwgMCkKLSNkZWZpbmUg bXV0ZXhfZGVzdHJveShtdHgpCQlsb2NrdW5pbml0KG10eCkKLSNkZWZpbmUgbXV0ZXhfZW50ZXIo bXR4KQkJbG9ja21ncihtdHgsIExLX0VYQ0xVU0lWRSkKLSNkZWZpbmUgbXV0ZXhfZXhpdChtdHgp CQkJbG9ja21ncihtdHgsIExLX1JFTEVBU0UpCisjZGVmaW5lIG11dGV4X2Rlc3Ryb3kobXR4KQls 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