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2010-02-03mm: flush dcache before writing into page to avoid aliasanfei zhou1-0/+3
The cache alias problem will happen if the changes of user shared mapping is not flushed before copying, then user and kernel mapping may be mapped into two different cache line, it is impossible to guarantee the coherence after iov_iter_copy_from_user_atomic. So the right steps should be: flush_dcache_page(page); kmap_atomic(page); write to page; kunmap_atomic(page); flush_dcache_page(page); More precisely, we might create two new APIs flush_dcache_user_page and flush_dcache_kern_page to replace the two flush_dcache_page accordingly. Here is a snippet tested on omap2430 with VIPT cache, and I think it is not ARM-specific: int val = 0x11111111; fd = open("abc", O_RDWR); addr = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); *(addr+0) = 0x44444444; tmp = *(addr+0); *(addr+1) = 0x77777777; write(fd, &val, sizeof(int)); close(fd); The results are not always 0x11111111 0x77777777 at the beginning as expected. Sometimes we see 0x44444444 0x77777777. Signed-off-by: Anfei <anfei.zhou@gmail.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: <linux-arch@vger.kernel.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-11-27fuse: reject O_DIRECT flag also in fuse_createCsaba Henk1-0/+3
The comment in fuse_open about O_DIRECT: "VFS checks this, but only _after_ ->open()" also holds for fuse_create, however, the same kind of check was missing there. As an impact of this bug, open(newfile, O_RDWR|O_CREAT|O_DIRECT) fails, but a stub newfile will remain if the fuse server handled the implied FUSE_CREATE request appropriately. Other impact: in the above situation ima_file_free() will complain to open/free imbalance if CONFIG_IMA is set. Signed-off-by: Csaba Henk <csaba@gluster.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Harshavardhana <harsha@gluster.com> Cc: stable@kernel.org
2009-11-04fuse: invalidate target of renameMiklos Szeredi1-1/+3
Invalidate the target's attributes, which may have changed (such as nlink, change time) so that they are refreshed on the next getattr(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-11-04fuse: fix kunmap in fuse_ioctl_copy_userJens Axboe1-1/+1
Looks like another victim of the confusing kmap() vs kmap_atomic() API differences. Reported-by: Todor Gyumyushev <yodor1@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Tejun Heo <tj@kernel.org> Cc: stable@kernel.org
2009-11-04fuse: prevent fuse_put_request on invalid pointerAnand V. Avati1-1/+2
fuse_direct_io() has a loop where requests are allocated in each iteration. if allocation fails, the loop is broken out and follows into an unconditional fuse_put_request() on that invalid pointer. Signed-off-by: Anand V. Avati <avati@gluster.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: stable@kernel.org
2009-09-27const: mark struct vm_struct_operationsAlexey Dobriyan1-1/+1
* mark struct vm_area_struct::vm_ops as const * mark vm_ops in AGP code But leave TTM code alone, something is fishy there with global vm_ops being used. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-24truncate: use new helpersnpiggin@suse.de3-22/+5
Update some fs code to make use of new helper functions introduced in the previous patch. Should be no significant change in behaviour (except CIFS now calls send_sig under i_lock, via inode_newsize_ok). Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Miklos Szeredi <miklos@szeredi.hu> Cc: linux-nfs@vger.kernel.org Cc: Trond.Myklebust@netapp.com Cc: linux-cifs-client@lists.samba.org Cc: sfrench@samba.org Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-09-18Merge branch 'for-linus' of ↵Linus Torvalds4-15/+231
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: fuse: add fusectl interface to max_background fuse: limit user-specified values of max background requests fuse: use drop_nlink() instead of direct nlink manipulation fuse: document protocol version negotiation fuse: make the number of max background requests and congestion threshold tunable
2009-09-16fs: Assign bdi in super_blockJens Axboe1-0/+2
We do this automatically in get_sb_bdev() from the set_bdev_super() callback. Filesystems that have their own private backing_dev_info must assign that in ->fill_super(). Note that ->s_bdi assignment is required for proper writeback! Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-09-16fuse: add fusectl interface to max_backgroundCsaba Henk3-5/+141
Make the max_background and congestion_threshold parameters of a FUSE mount tunable at runtime by adding the respective knobs to its directory within the fusectl filesystem. Signed-off-by: Csaba Henk <csaba@gluster.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-09-16fuse: limit user-specified values of max background requestsCsaba Henk1-6/+72
An untrusted user could DoS the system if s/he were allowed to accumulate an arbitrary number of pending background requests by setting the above limits to extremely high values in INIT. This patch excludes this possibility by imposing global upper limits on the possible values of per-mount "max background requests" and "congestion threshold" parameters for unprivileged FUSE filesystems. These global limits are implemented as module parameters. Signed-off-by: Csaba Henk <csaba@gluster.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-09-16fuse: use drop_nlink() instead of direct nlink manipulationCsaba Henk1-1/+1
drop_nlink() is the API function to decrease the link count of an inode. However, at a place the control filesystem used the decrement operator on i_nlink directly. Fix this. Cc: Anand Avati <avati@gluster.com> Signed-off-by: Csaba Henk <csaba@gluster.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-09-11writeback: add name to backing_dev_infoJens Axboe1-0/+1
This enables us to track who does what and print info. Its main use is catching dirty inodes on the default_backing_dev_info, so we can fix that up. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-07-11Revert "fuse: Fix build error" as unnecessaryLinus Torvalds1-1/+0
This reverts commit 097041e576ee3a50d92dd643ee8ca65bf6a62e21. Trond had a better fix, which is the parent of this one ("Fix compile error due to congestion_wait() changes") Requested-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-07-11fuse: Fix build errorLarry Finger1-0/+1
When building v2.6.31-rc2-344-g69ca06c, the following build errors are found due to missing includes: CC [M] fs/fuse/dev.o fs/fuse/dev.c: In function ‘request_end’: fs/fuse/dev.c:289: error: ‘BLK_RW_SYNC’ undeclared (first use in this function) ... fs/nfs/write.c: In function ‘nfs_set_page_writeback’: fs/nfs/write.c:207: error: ‘BLK_RW_ASYNC’ undeclared (first use in this function) Signed-off-by: Larry Finger@lwfinger.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-07-10Fix congestion_wait() sync/async vs read/write confusionJens Axboe1-4/+4
Commit 1faa16d22877f4839bd433547d770c676d1d964c accidentally broke the bdi congestion wait queue logic, causing us to wait on congestion for WRITE (== 1) when we really wanted BLK_RW_ASYNC (== 0) instead. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-07-07fuse: make the number of max background requests and congestion threshold ↵Csaba Henk3-11/+25
tunable The practical values for these limits depend on the design of the filesystem server so let userspace set them at initialization time. Signed-off-by: Csaba Henk <csaba@gluster.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-06-30fuse: invalidation reverse callsJohn Muir4-3/+198
Add notification messages that allow the filesystem to invalidate VFS caches. Two notifications are added: 1) inode invalidation - invalidate cached attributes - invalidate a range of pages in the page cache (this is optional) 2) dentry invalidation - try to invalidate a subtree in the dentry cache Care must be taken while accessing the 'struct super_block' for the mount, as it can go away while an invalidation is in progress. To prevent this, introduce a rw-semaphore, that is taken for read during the invalidation and taken for write in the ->kill_sb callback. Cc: Csaba Henk <csaba@gluster.com> Cc: Anand Avati <avati@zresearch.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-06-30fuse: allow umask processing in userspaceMiklos Szeredi3-4/+28
This patch lets filesystems handle masking the file mode on creation. This is needed if filesystem is using ACLs. - The CREATE, MKDIR and MKNOD requests are extended with a "umask" parameter. - A new FUSE_DONT_MASK flag is added to the INIT request/reply. With this the filesystem may request that the create mode is not masked. CC: Jean-Pierre André <jean-pierre.andre@wanadoo.fr> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-06-30fuse: fix bad return value in fuse_file_poll()Miklos Szeredi1-1/+1
Fix fuse_file_poll() which returned a -errno value instead of a poll mask. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: stable@kernel.org
2009-06-30fuse: fix return value of fuse_dev_write()Csaba Henk1-1/+1
On 64 bit systems -- where sizeof(ssize_t) > sizeof(int) -- the following test exposes a bug due to a non-careful return of an int or unsigned value: implement a FUSE filesystem which sends an unsolicited notification to the kernel with invalid opcode. The respective write to /dev/fuse will return (1 << 32) - EINVAL with errno == 0 instead of -1 with errno == EINVAL. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: stable@kernel.org
2009-06-17fuse doesn't need BKL in ->umount_begin()Al Viro1-3/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-12Merge branch 'cuse' of ↵Linus Torvalds7-231/+939
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse * 'cuse' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: CUSE: implement CUSE - Character device in Userspace fuse: export symbols to be used by CUSE fuse: update fuse_conn_init() and separate out fuse_conn_kill() fuse: don't use inode in fuse_file_poll fuse: don't use inode in fuse_do_ioctl() helper fuse: don't use inode in fuse_sync_release() fuse: create fuse_do_open() helper for CUSE fuse: clean up args in fuse_finish_open() and fuse_release_fill() fuse: don't use inode in helpers called by fuse_direct_io() fuse: add members to struct fuse_file fuse: prepare fuse_direct_io() for CUSE fuse: clean up fuse_write_fill() fuse: use struct path in release structure fuse: misc cleanups
2009-06-09CUSE: implement CUSE - Character device in UserspaceTejun Heo2-0/+611
CUSE enables implementing character devices in userspace. With recent additions of ioctl and poll support, FUSE already has most of what's necessary to implement character devices. All CUSE has to do is bonding all those components - FUSE, chardev and the driver model - nicely. When client opens /dev/cuse, kernel starts conversation with CUSE_INIT. The client tells CUSE which device it wants to create. As the previous patch made fuse_file usable without associated fuse_inode, CUSE doesn't create super block or inodes. It attaches fuse_file to cdev file->private_data during open and set ff->fi to NULL. The rest of the operation is almost identical to FUSE direct IO case. Each CUSE device has a corresponding directory /sys/class/cuse/DEVNAME (which is symlink to /sys/devices/virtual/class/DEVNAME if SYSFS_DEPRECATED is turned off) which hosts "waiting" and "abort" among other things. Those two files have the same meaning as the FUSE control files. The only notable lacking feature compared to in-kernel implementation is mmap support. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-05-14Merge branch 'for-linus' of ↵Linus Torvalds1-0/+1
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: fuse: destroy bdi on error
2009-05-09vfs: umount_begin BKL pushdownAlessio Igor Bogani1-0/+3
Push BKL down into ->umount_begin() Signed-off-by: Alessio Igor Bogani <abogani@texware.it> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-04-28fuse: export symbols to be used by CUSETejun Heo4-9/+39
Export the following symbols for CUSE. fuse_conn_put() fuse_conn_get() fuse_conn_kill() fuse_send_init() fuse_do_open() fuse_sync_release() fuse_direct_io() fuse_do_ioctl() fuse_file_poll() fuse_request_alloc() fuse_get_req() fuse_put_request() fuse_request_send() fuse_abort_conn() fuse_dev_release() fuse_dev_operations Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: update fuse_conn_init() and separate out fuse_conn_kill()Tejun Heo3-53/+72
Update fuse_conn_init() such that it doesn't take @sb and move bdi registration into a separate function. Also separate out fuse_conn_kill() from fuse_put_super(). These will be used to implement cuse. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: don't use inode in fuse_file_pollMiklos Szeredi1-3/+2
Use ff->fc and ff->nodeid instead of file->f_dentry->d_inode in the fuse_file_poll() implementation. This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: don't use inode in fuse_do_ioctl() helperMiklos Szeredi1-14/+21
Create a helper for sending an IOCTL request that doesn't use a struct inode. This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: don't use inode in fuse_sync_release()Miklos Szeredi3-39/+36
Make fuse_sync_release() a generic helper function that doesn't need a struct inode pointer. This makes it suitable for use by CUSE. Change return value of fuse_release_common() from int to void. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: create fuse_do_open() helper for CUSEMiklos Szeredi3-27/+42
Create a helper for sending an OPEN request that doesn't need a struct inode pointer. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: clean up args in fuse_finish_open() and fuse_release_fill()Miklos Szeredi3-23/+30
Move setting ff->fh, ff->nodeid and file->private_data outside fuse_finish_open(). Add ->open_flags member to struct fuse_file. This simplifies the argument passing to fuse_finish_open() and fuse_release_fill(), and paves the way for creating an open helper that doesn't need an inode pointer. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: don't use inode in helpers called by fuse_direct_io()Miklos Szeredi3-34/+32
Use ff->fc and ff->nodeid instead of passing down the inode. This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: add members to struct fuse_fileMiklos Szeredi2-2/+10
Add new members ->fc and ->nodeid to struct fuse_file. This will aid in converting functions for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: prepare fuse_direct_io() for CUSEMiklos Szeredi1-10/+23
Move code operating on the inode out from fuse_direct_io(). This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: clean up fuse_write_fill()Miklos Szeredi1-9/+8
Move out code from fuse_write_fill() which is not common to all callers. Remove two function arguments which become unnecessary. Also remove unnecessary memset(), the request is already initialized to zero. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: use struct path in release structureMiklos Szeredi2-7/+5
Use struct path instead of separate dentry and vfsmount in req->misc.release. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-28fuse: destroy bdi on errorMiklos Szeredi1-0/+1
Destroy bdi on error in fuse_fill_super(). This was an omission from commit 26c3679101dbccc054dcf370143941844ba70531 "fuse: destroy bdi on umount", which moved the bdi_destroy() call from fuse_conn_put() to fuse_put_super(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: stable@kernel.org
2009-04-28fuse: misc cleanupsTejun Heo1-37/+44
* fuse_file_alloc() was structured in weird way. The success path was split between else block and code following the block. Restructure the code such that it's easier to read and modify. * Unindent success path of fuse_release_common() to ease future changes. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-09fuse: fix "direct_io" private mmapMiklos Szeredi1-0/+2
MAP_PRIVATE mmap could return stale data from the cache for "direct_io" files. Fix this by flushing the cache on mmap. Found with a slightly modified fsx-linux. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-09fuse: fix argument type in fuse_get_user_pages()Miklos Szeredi1-3/+3
Fix the following warning: fs/fuse/file.c: In function 'fuse_direct_io': fs/fuse/file.c:1002: warning: passing argument 3 of 'fuse_get_user_pages' from incompatible pointer type This was introduced by commit f4975c67 "fuse: allow kernel to access "direct_io" files". Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-02fuse: allow private mappings of "direct_io" filesMiklos Szeredi1-1/+11
Allow MAP_PRIVATE mmaps of "direct_io" files. This is necessary for execute support. MAP_SHARED mappings require some sort of coherency between the underlying file and the mapping. With "direct_io" it is difficult to provide this, so for the moment just disallow shared (read-write and read-only) mappings altogether. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-02fuse: allow kernel to access "direct_io" filesMiklos Szeredi2-12/+31
Allow the kernel read and write on "direct_io" files. This is necessary for nfs export and execute support. The implementation is simple: if an access from the kernel is detected, don't perform get_user_pages(), just use the kernel address provided by the requester to copy from/to the userspace filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-04-01mm: page_mkwrite change prototype to match faultNick Piggin1-1/+2
Change the page_mkwrite prototype to take a struct vm_fault, and return VM_FAULT_xxx flags. There should be no functional change. This makes it possible to return much more detailed error information to the VM (and also can provide more information eg. virtual_address to the driver, which might be important in some special cases). This is required for a subsequent fix. And will also make it easier to merge page_mkwrite() with fault() in future. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Chris Mason <chris.mason@oracle.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <joel.becker@oracle.com> Cc: Artem Bityutskiy <dedekind@infradead.org> Cc: Felix Blyakher <felixb@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-30fuse: fix fuse_file_lseek returning with lock heldDan Carpenter1-1/+2
This bug was found with smatch (http://repo.or.cz/w/smatch.git/). If we return directly the inode->i_mutex lock doesn't get released. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: stable@kernel.org
2009-03-27constify dentry_operations: FUSEAl Viro2-2/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-01-26Merge branch 'Kconfig' of ↵Linus Torvalds1-0/+15
git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/misc * 'Kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/misc: (36 commits) fs/Kconfig: move 9p out fs/Kconfig: move afs out fs/Kconfig: move coda out fs/Kconfig: move the rest of ncpfs out fs/Kconfig: move smbfs out fs/Kconfig: move sunrpc out fs/Kconfig: move nfsd out fs/Kconfig: move nfs out fs/Kconfig: move ufs out fs/Kconfig: move sysv out fs/Kconfig: move romfs out fs/Kconfig: move qnx4 out fs/Kconfig: move hpfs out fs/Kconfig: move omfs out fs/Kconfig: move minix out fs/Kconfig: move vxfs out fs/Kconfig: move squashfs out fs/Kconfig: move cramfs out fs/Kconfig: move efs out fs/Kconfig: move bfs out ...
2009-01-26fuse: fix poll notifyMiklos Szeredi1-4/+9
Move fuse_copy_finish() to before calling fuse_notify_poll_wakeup(). This is not a big issue because fuse_notify_poll_wakeup() should be atomic, but it's cleaner this way, and later uses of notification will need to be able to finish the copying before performing some actions. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-01-26fuse: destroy bdi on umountMiklos Szeredi2-2/+3
If a fuse filesystem is unmounted but the device file descriptor remains open and a new mount reuses the old device number, then the mount fails with EEXIST and the following warning is printed in the kernel log: WARNING: at fs/sysfs/dir.c:462 sysfs_add_one+0x35/0x3d() sysfs: duplicate filename '0:15' can not be created The cause is that the bdi belonging to the fuse filesystem was destoryed only after the device file was released. Fix this by calling bdi_destroy() from fuse_put_super() instead. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: stable@kernel.org
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