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* fs/9p: Prevent parallel rename when doing fid_lookupAneesh Kumar K.V2010-08-021-0/+1
| | | | | | | | | | | | During fid lookup we need to make sure that the dentry->d_parent doesn't change so that we can safely walk the parent dentries. To ensure that we need to prevent cross directory rename during fid_lookup. Add a per superblock rename_sem rw_semaphore to prevent parallel fid lookup and rename. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: add bdi backing to mount sessionJens Axboe2010-04-221-0/+2
| | | | | | This ensures that dirty data gets flushed properly. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* 9p: Make sure we are able to clunk the cached fid on umountAneesh Kumar K.V2010-04-051-0/+1
| | | | | | | | | | dcache prune happen on umount. So we cannot mark the client satus disconnect. That will prevent a 9p call to the server Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: Change the name of new protocol from 9p2010.L to 9p2000.LSripathi Kodi2010-03-131-3/+3
| | | | | | | | | This patch changes the name of the new 9P protocol from 9p2010.L to 9p2000.u. This is because we learnt that the name 9p2010 is already being used by others. Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9P2010.L handshake: Add VFS flagsSripathi Kodi2010-03-051-8/+15
| | | | | | | | | | Add 9P2000.u and 9P2010.L protocol flags to V9FS VFS This patch adds 9P2000.u and 9P2010.L protocol flags into V9FS VFS side code and removes the single flag used for 'extended'. Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: Add fscache support to 9pAbhishek Kulkarni2009-09-231-4/+9
| | | | | | | | | | | | | | | | | | | This patch adds a persistent, read-only caching facility for 9p clients using the FS-Cache caching backend. When the fscache facility is enabled, each inode is associated with a corresponding vcookie which is an index into the FS-Cache indexing tree. The FS-Cache indexing tree is indexed at 3 levels: - session object associated with each mount. - inode/vcookie - actual data (pages) A cache tag is chosen randomly for each session. These tags can be read off /sys/fs/9p/caches and can be passed as a mount-time parameter to re-attach to the specified caching session. Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: remove unnecessary v9fses->options which duplicates the mount stringAbhishek Kulkarni2009-08-171-1/+0
| | | | | | | | | | The mount options string is saved in sb->s_options. This patch removes the redundant duplicating of the mount options. Also, since we are not displaying anything special in show options, we replace v9fs_show_options with generic_show_options for now. Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: Documentation updatesEric Van Hensbergen2008-05-141-25/+60
| | | | | | | | The kernel-doc comments of much of the 9p system have been in disarray since reorganization. This patch fixes those problems, adds additional documentation and a template book which collects the 9p information. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: transport API reorganizationEric Van Hensbergen2008-02-061-3/+2
| | | | | | | | | | This merges the mux.c (including the connection interface) with trans_fd in preparation for transport API changes. Ultimately, trans_fd will need to be rewritten to clean it up and simplify the implementation, but this reorganization is viewed as the first step. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: attach-per-userLatchesar Ionkov2007-10-171-3/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The 9P2000 protocol requires the authentication and permission checks to be done in the file server. For that reason every user that accesses the file server tree has to authenticate and attach to the server separately. Multiple users can share the same connection to the server. Currently v9fs does a single attach and executes all I/O operations as a single user. This makes using v9fs in multiuser environment unsafe as it depends on the client doing the permission checking. This patch improves the 9P2000 support by allowing every user to attach separately. The patch defines three modes of access (new mount option 'access'): - attach-per-user (access=user) (default mode for 9P2000.u) If a user tries to access a file served by v9fs for the first time, v9fs sends an attach command to the server (Tattach) specifying the user. If the attach succeeds, the user can access the v9fs tree. As there is no uname->uid (string->integer) mapping yet, this mode works only with the 9P2000.u dialect. - allow only one user to access the tree (access=<uid>) Only the user with uid can access the v9fs tree. Other users that attempt to access it will get EPERM error. - do all operations as a single user (access=any) (default for 9P2000) V9fs does a single attach and all operations are done as a single user. If this mode is selected, the v9fs behavior is identical with the current one. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: rename uid and gid parametersLatchesar Ionkov2007-10-171-3/+5
| | | | | | | | | | Change the names of 'uid' and 'gid' parameters to the more appropriate 'dfltuid' and 'dfltgid'. This also sets the default uid/gid to -2 (aka nfsnobody) Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: define session flagsLatchesar Ionkov2007-10-171-1/+11
| | | | | | | | | Create more general flags field in the v9fs_session_info struct and move the 'extended' flag as a bit in the flags. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: Make transports dynamicEric Van Hensbergen2007-10-171-13/+2
| | | | | | | | | This patch abstracts out the interfaces to underlying transports so that new transports can be added as modules. This should also allow kernel configuration of transports without ifdef-hell. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: Reorganization of 9p file system codeLatchesar Ionkov2007-07-141-24/+8
| | | | | | | | | | | This patchset moves non-filesystem interfaces of v9fs from fs/9p to net/9p. It moves the transport, packet marshalling and connection layers to net/9p leaving only the VFS related files in fs/9p. This work is being done in preparation for in-kernel 9p servers as well as alternate 9p clients (other than VFS). Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* 9p: implement optional loose read cacheEric Van Hensbergen2007-02-181-1/+8
| | | | | | | | | | | | | | | While cacheing is generally frowned upon in the 9p world, it has its place -- particularly in situations where the remote file system is exclusive and/or read-only. The vacfs views of venti content addressable store are a real-world instance of such a situation. To facilitate higher performance for these workloads (and eventually use the fscache patches), we have enabled a "loose" cache mode which does not attempt to maintain any form of consistency on the page-cache or dcache. This results in over two orders of magnitude performance improvement for cacheable block reads in the Bonnie benchmark. The more aggressive use of the dcache also seems to improve metadata operational performance. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
* [PATCH] v9fs: update license boilerplateEric Van Hensbergen2006-03-251-3/+2
| | | | | | | | | | Update license boilerplate to specify GPLv2 and remove the (at your option clause). This change was agreed to by all the copyright holders (approvals can be found on v9fs-developer mailing list). Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] v9fs: rename tids to tags to be consistent with Plan 9 documentationRuss Cox2006-03-251-3/+0
| | | | | | | | | The code talks about these things called tids, which I eventually figured out are tags. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] v9fs: new multiplexer implementationLatchesar Ionkov2006-01-081-12/+5
| | | | | | | | | | New multiplexer implementation. Decreases the number of kernel threads required. Better handling when the user process receives a signal. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] v9fs: Support to force umountEric Van Hensbergen2005-09-091-3/+1
| | | | | | | | | Support for force umount Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] v9fs: VFS superblock operations and glueEric Van Hensbergen2005-09-091-0/+105
This part of the patch contains VFS superblock and mapping code. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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