Subject: [PATCHSET] FUSE: implement direct mmap
Newsgroups: gmane.comp.file-systems.fuse.devel, gmane.linux.kernel
Date: 2008-11-20 14:52:14 GMT (3 years, 25 weeks, 2 days, 7 hours and 24 minutes ago)
Hello, This is the first take of fuse-implement-direct-mmap patchset. This patchset implements direct mmap support for FUSE (and CUSE). Each direct mmap area is backed by anonymous mapping (shmem_file) and the FUSE server can decide how they are shared. mmap request is handled in two steps. MMAP first queries the server whether it wants to share the mapping with an existing one or create a new one, and if so, with which flags. MMAP_COMMIT notifies the server the result of mmap and if successful the fd the server can use to access the mmap region. This patchset contains the following six patches. 0001-mmap-don-t-assume-f_op-mmap-doesn-t-change-vma.patch 0002-fdtable-export-alloc_fd.patch 0003-FUSE-don-t-let-fuse_req-end-put-the-base-referen.patch 0004-FUSE-make-request_wait_answer-wait-for-end-co.patch 0005-FUSE-implement-fuse_req-prep.patch 0006-FUSE-implement-direct-mmap.patch 0001-0002 update mm and fdtable for following FUSE changes. 0003-0005 update fuse_req->end() handling and add ->prep(). 0006 implements direct mmap. Direct mmap implementation jumps through a few hoops to override vma->vm_file with shmem_file. It would be great if there's a cleaner way to achieve this. For details, please take a look at 0006. Nick, can you please verify that 0001 doesn't break anything and replacing vma->vm_file in ->mmap() is okay? Andrew, would 0002 be okay? Thanks. This patchset is on top of master (ee2f6cc7f9ea2542ad46070ed62ba7aa04d08871) + [1] poll-allow-f_op_poll-to-sleep-take-2 + [2] add-cdev_release-and-convert-cdev_alloc-to-use-it + [3] extend-FUSE patchset, take #2 + [4] implement-CUSE patchset, take #2 This patchset is also available in the following git tree. http://git.kernel.org/?p=linux/kernel/git/tj/misc.git;a=shortlog;h=fuse-mmap git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git fuse-mmap and contains the following changes. fs/file.c | 1 fs/fuse/cuse.c | 6 fs/fuse/dev.c | 75 ++++++--- fs/fuse/file.c | 412 ++++++++++++++++++++++++++++++++++++++++++++++++++- fs/fuse/fuse_i.h | 19 ++ fs/fuse/inode.c | 1 include/linux/fuse.h | 47 +++++ mm/mmap.c | 1 8 files changed, 533 insertions(+), 29 deletions(-) -- tejun [1] http://lkml.org/lkml/2008/11/20/161 [2] http://article.gmane.org/gmane.linux.kernel/727133 [3] http://lkml.org/lkml/2008/11/20/171 [4] http://lkml.org/lkml/2008/11/20/179 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/