Linux-Fuse文件系统分析.doc

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1、FilesysteminUserspace一、Introduction：WithFUSEitispossibletoimplementafullyfunctionalfilesysteminauserspaceprogram. Featuresinclude:·SimplelibraryAPI·Simpleinstallation(noneedtopatchorrecompilethekernel)·Secureimplementation·Userspace-kernelinterfaceisveryefficient·Usablebynonprivileged

2、users·RunsonLinuxkernels2.4.Xand2.6.X·HasprovenverystableovertimeFUSEwasoriginallydevelopedtosupport AVFS butithassincebecameaseparateproject. Nowquiteafewother projects areusingit. Implementingafilesystemissimple, a helloworld filesystemislessthana100lineslong. Here'sasamplesession:~

3、/fuse/example$mkdir/tmp/fuse~/fuse/example$./hello/tmp/fuse~/fuse/example$ls-l/tmp/fusetotal0-r--r--r--1rootroot13Jan11970hello~/fuse/example$cat/tmp/fuse/helloHelloWorld!~/fuse/example$fusermount-u/tmp/fuse~/fuse/example$二、InstallationSomeprojectsincludethewholeFUSEpackage(forsimpler

4、installation). InothercasesorjusttotryouttheexamplesFUSEmustbeinstalledfirst. Theinstallationissimple,afterunpackingenter:>./configure>make>makeinstallIfthisproducesanerror,pleasereadon.Theconfigurescriptwilltrytoguessthelocationofthekernelsource. Incasethisfails,itmaybespecifiedusing

5、the --with-kernel parameter.  Buildingthekernelmoduleneedsaconfiguredkernelsourcetreematchingtherunningkernel. Ifyoubuildyourownkernelthisisnoproblem. Ontheotherhandifaprecompiledkernelisused,thekernelheadersusedbytheFUSEbuildprocessmustfirstbeprepared. Therearetwopossibilities:1.Apac

6、kagecontainingthekernelheadersforthekernelbinaryisavailableinthedistribution(e.g.onDebianit'sthekernel-headers-X.Y.Zpackageforkernel-image-X.Y.Z)2.Thekernelsourcemustbeprepared:oExtractthekernelsourcetosomedirectoryoCopytherunningkernel'sconfig(usuallyfoundin/boot/config-X.Y.Z)to .con

7、fig atthetopofthesourcetreeoRun makeprepare三、hello.c代码分析四、TryingitoutAfterinstallation,youcantryoutthefilesystemsinthe example directory. Toseewhatishappeningtryaddingthe -d option. Thisistheoutputproducedbyrunning cat/tmp/fuse/hello inanothershell:~/fuse/example>./hello/tmp/fuse-duni

8、que:2