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author | Miklos Szeredi <miklos@szeredi.hu> | 2009-06-19 10:27:38 +0000 |
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committer | Miklos Szeredi <miklos@szeredi.hu> | 2009-06-19 10:27:38 +0000 |
commit | ecd073bd7054c9e13516041e3ef930e39270c8df (patch) | |
tree | bb36abf9662bec5c5027363f6d0d902d00f40815 /README.NFS | |
parent | 17d1cf6956d08de9aa79b4a7691fb50a2446fa18 (diff) | |
download | android_external_fuse-ecd073bd7054c9e13516041e3ef930e39270c8df.tar.gz android_external_fuse-ecd073bd7054c9e13516041e3ef930e39270c8df.tar.bz2 android_external_fuse-ecd073bd7054c9e13516041e3ef930e39270c8df.zip |
Add fuse_getgroups (high level lib) and fuse_req_getgroups (low
level lib) functions to query the supplementary group IDs for the
current request. Currently this is implemented on Linux by
reading from the /proc filesystem.
Diffstat (limited to 'README.NFS')
-rw-r--r-- | README.NFS | 29 |
1 files changed, 29 insertions, 0 deletions
@@ -2,3 +2,32 @@ NFS exporting is supported in Linux kernels 2.6.27 or later. You need to add an fsid=NNN option to /etc/exports to make exporting a FUSE directory work. + +Filesystem support +------------------ + +NFS exporting works to some extent on all fuse filesystems, but not +perfectly. This is due to the stateless nature of the protocol, the +server has no way of knowing whether the client is keeping a reference +to a file or not, and hence that file may be removed from the server's +cache. In that case there has to be a way to look up that object +using the inode number, otherwise an ESTALE error will be returned. + +1) low-level interface + +Filesystems need to implement special lookups for the names "." and +"..". The former may be requested on any inode, including +non-directories, while the latter is only requested for directories. +Otherwise these special lookups should behave identically to ordinary +lookups. + +2) high-level interface + +Because the high-level interface is path based, it is not possible to +delegate looking up by inode to the filesystem. + +To work around this, currently a "noforget" option is provided, which +makes the library remember nodes forever. This will make the NFS +server happy, but also results in an ever growing memory footprint for +the filesystem. For this reason if the filesystem is large (or the +memory is small), then this option is not recommended. |