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2017-09-14Merge branch 'work.set_fs' of ↵Linus Torvalds1-11/+32
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull more set_fs removal from Al Viro: "Christoph's 'use kernel_read and friends rather than open-coding set_fs()' series" * 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs: unexport vfs_readv and vfs_writev fs: unexport vfs_read and vfs_write fs: unexport __vfs_read/__vfs_write lustre: switch to kernel_write gadget/f_mass_storage: stop messing with the address limit mconsole: switch to kernel_read btrfs: switch write_buf to kernel_write net/9p: switch p9_fd_read to kernel_write mm/nommu: switch do_mmap_private to kernel_read serial2002: switch serial2002_tty_write to kernel_{read/write} fs: make the buf argument to __kernel_write a void pointer fs: fix kernel_write prototype fs: fix kernel_read prototype fs: move kernel_read to fs/read_write.c fs: move kernel_write to fs/read_write.c autofs4: switch autofs4_write to __kernel_write ashmem: switch to ->read_iter
2017-09-04fs: unexport vfs_readv and vfs_writevChristoph Hellwig1-3/+1
We've got no modular users left, and any potential modular user is better of with iov_iter based variants. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-09-04fs: unexport vfs_read and vfs_writeChristoph Hellwig1-4/+0
No modular users left. Given that they take user pointers there is no good reason to export it to drivers to start with. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-09-04fs: unexport __vfs_read/__vfs_writeChristoph Hellwig1-2/+0
No modular users left, and any new ones should use kernel_read/write or iov_iter variants instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-09-04fs: make the buf argument to __kernel_write a void pointerChristoph Hellwig1-1/+1
This matches kernel_read and kernel_write and avoids any need for casts in the callers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-09-04fs: fix kernel_write prototypeChristoph Hellwig1-3/+3
Make the position an in/out argument like all the other read/write helpers and and make the buf argument a void pointer. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-09-04fs: fix kernel_read prototypeChristoph Hellwig1-5/+3
Use proper ssize_t and size_t types for the return value and count argument, move the offset last and make it an in/out argument like all other read/write helpers, and make the buf argument a void pointer to get rid of lots of casts in the callers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-09-04fs: move kernel_read to fs/read_write.cChristoph Hellwig1-0/+16
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-09-04fs: move kernel_write to fs/read_write.cChristoph Hellwig1-1/+16
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-08-31annotate RWF_... flagsChristoph Hellwig1-25/+25
[AV: added missing annotations in syscalls.h/compat.h] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-07Merge branch 'work.read_write' of ↵Linus Torvalds1-2/+4
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull read/write fix from Al Viro: "file_start_write()/file_end_write() got mixed into vfs_iter_write() by accident; that's a deadlock for all existing callers - they already do that, some - quite a bit outside. Easily fixed, fortunately" * 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: move file_{start,end}_write() out of do_iter_write()
2017-07-06move file_{start,end}_write() out of do_iter_write()Al Viro1-2/+4
... and do *not* grab it in vfs_write_iter(). Fixes: "fs: implement vfs_iter_read using do_iter_read" Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-05Merge branch 'work.read_write' of ↵Linus Torvalds1-129/+91
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull read/write updates from Al Viro: "Christoph's fs/read_write.c series - consolidation and cleanups" * 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: nfsd: remove nfsd_vfs_read nfsd: use vfs_iter_read/write fs: implement vfs_iter_write using do_iter_write fs: implement vfs_iter_read using do_iter_read fs: move more code into do_iter_read/do_iter_write fs: remove __do_readv_writev fs: remove do_compat_readv_writev fs: remove do_readv_writev
2017-07-03Merge branch 'for-4.13/block' of git://git.kernel.dk/linux-blockLinus Torvalds1-9/+3
Pull core block/IO updates from Jens Axboe: "This is the main pull request for the block layer for 4.13. Not a huge round in terms of features, but there's a lot of churn related to some core cleanups. Note this depends on the UUID tree pull request, that Christoph already sent out. This pull request contains: - A series from Christoph, unifying the error/stats codes in the block layer. We now use blk_status_t everywhere, instead of using different schemes for different places. - Also from Christoph, some cleanups around request allocation and IO scheduler interactions in blk-mq. - And yet another series from Christoph, cleaning up how we handle and do bounce buffering in the block layer. - A blk-mq debugfs series from Bart, further improving on the support we have for exporting internal information to aid debugging IO hangs or stalls. - Also from Bart, a series that cleans up the request initialization differences across types of devices. - A series from Goldwyn Rodrigues, allowing the block layer to return failure if we will block and the user asked for non-blocking. - Patch from Hannes for supporting setting loop devices block size to that of the underlying device. - Two series of patches from Javier, fixing various issues with lightnvm, particular around pblk. - A series from me, adding support for write hints. This comes with NVMe support as well, so applications can help guide data placement on flash to improve performance, latencies, and write amplification. - A series from Ming, improving and hardening blk-mq support for stopping/starting and quiescing hardware queues. - Two pull requests for NVMe updates. Nothing major on the feature side, but lots of cleanups and bug fixes. From the usual crew. - A series from Neil Brown, greatly improving the bio rescue set support. Most notably, this kills the bio rescue work queues, if we don't really need them. - Lots of other little bug fixes that are all over the place" * 'for-4.13/block' of git://git.kernel.dk/linux-block: (217 commits) lightnvm: pblk: set line bitmap check under debug lightnvm: pblk: verify that cache read is still valid lightnvm: pblk: add initialization check lightnvm: pblk: remove target using async. I/Os lightnvm: pblk: use vmalloc for GC data buffer lightnvm: pblk: use right metadata buffer for recovery lightnvm: pblk: schedule if data is not ready lightnvm: pblk: remove unused return variable lightnvm: pblk: fix double-free on pblk init lightnvm: pblk: fix bad le64 assignations nvme: Makefile: remove dead build rule blk-mq: map all HWQ also in hyperthreaded system nvmet-rdma: register ib_client to not deadlock in device removal nvme_fc: fix error recovery on link down. nvmet_fc: fix crashes on bad opcodes nvme_fc: Fix crash when nvme controller connection fails. nvme_fc: replace ioabort msleep loop with completion nvme_fc: fix double calls to nvme_cleanup_cmd() nvme-fabrics: verify that a controller returns the correct NQN nvme: simplify nvme_dev_attrs_are_visible ...
2017-06-29fs: implement vfs_iter_write using do_iter_writeChristoph Hellwig1-20/+9
De-dupliate some code and allow for passing the flags argument to vfs_iter_write. Additionally it now properly updates timestamps. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-06-29fs: implement vfs_iter_read using do_iter_readChristoph Hellwig1-20/+9
De-dupliate some code and allow for passing the flags argument to vfs_iter_read. Additional it properly updates atime now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-06-29fs: move more code into do_iter_read/do_iter_writeChristoph Hellwig1-45/+28
The checks for the permissions and can read / write flags are common for the callers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-06-29fs: remove __do_readv_writevChristoph Hellwig1-24/+36
Split it into one helper each for reads vs writes. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-06-29fs: remove do_compat_readv_writevChristoph Hellwig1-26/+16
opencode it in both callers to simplify the call stack a bit. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-06-29fs: remove do_readv_writevChristoph Hellwig1-22/+21
opencode it in both callers to simplify the call stack a bit. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-06-20fs: Separate out kiocb flags setup based on RWF_* flagsGoldwyn Rodrigues1-9/+3
Also added RWF_SUPPORTED to encompass all flags. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-06-16fs: pass on flags in compat_writevChristoph Hellwig1-1/+1
Fixes: 793b80ef14af ("vfs: pass a flags argument to vfs_readv/vfs_writev") Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-04-17move compat_rw_copy_check_uvector() over to fs/read_write.cAl Viro1-0/+75
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-03-03Merge branch 'WIP.sched-core-for-linus' of ↵Linus Torvalds1-1/+2
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull sched.h split-up from Ingo Molnar: "The point of these changes is to significantly reduce the <linux/sched.h> header footprint, to speed up the kernel build and to have a cleaner header structure. After these changes the new <linux/sched.h>'s typical preprocessed size goes down from a previous ~0.68 MB (~22K lines) to ~0.45 MB (~15K lines), which is around 40% faster to build on typical configs. Not much changed from the last version (-v2) posted three weeks ago: I eliminated quirks, backmerged fixes plus I rebased it to an upstream SHA1 from yesterday that includes most changes queued up in -next plus all sched.h changes that were pending from Andrew. I've re-tested the series both on x86 and on cross-arch defconfigs, and did a bisectability test at a number of random points. I tried to test as many build configurations as possible, but some build breakage is probably still left - but it should be mostly limited to architectures that have no cross-compiler binaries available on kernel.org, and non-default configurations" * 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (146 commits) sched/headers: Clean up <linux/sched.h> sched/headers: Remove #ifdefs from <linux/sched.h> sched/headers: Remove the <linux/topology.h> include from <linux/sched.h> sched/headers, hrtimer: Remove the <linux/wait.h> include from <linux/hrtimer.h> sched/headers, x86/apic: Remove the <linux/pm.h> header inclusion from <asm/apic.h> sched/headers, timers: Remove the <linux/sysctl.h> include from <linux/timer.h> sched/headers: Remove <linux/magic.h> from <linux/sched/task_stack.h> sched/headers: Remove <linux/sched.h> from <linux/sched/init.h> sched/core: Remove unused prefetch_stack() sched/headers: Remove <linux/rculist.h> from <linux/sched.h> sched/headers: Remove the 'init_pid_ns' prototype from <linux/sched.h> sched/headers: Remove <linux/signal.h> from <linux/sched.h> sched/headers: Remove <linux/rwsem.h> from <linux/sched.h> sched/headers: Remove the runqueue_is_locked() prototype sched/headers: Remove <linux/sched.h> from <linux/sched/hotplug.h> sched/headers: Remove <linux/sched.h> from <linux/sched/debug.h> sched/headers: Remove <linux/sched.h> from <linux/sched/nohz.h> sched/headers: Remove <linux/sched.h> from <linux/sched/stat.h> sched/headers: Remove the <linux/gfp.h> include from <linux/sched.h> sched/headers: Remove <linux/rtmutex.h> from <linux/sched.h> ...
2017-03-02sched/headers: Prepare for new header dependencies before moving code to ↵Ingo Molnar1-1/+2
<linux/sched/xacct.h> We are going to split <linux/sched/xacct.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/xacct.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the .c file that is going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-02-20vfs: use helpers for calling f_op->{read,write}_iter()Miklos Szeredi1-6/+6
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2017-02-20vfs: pass type instead of fn to do_{loop,iter}_readv_writev()Miklos Szeredi1-19/+18
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2017-02-20vfs: extract common parts of {compat_,}do_readv_writev()Miklos Szeredi1-51/+29
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2017-02-07vfs: wrap write f_ops with file_{start,end}_write()Amir Goldstein1-2/+2
Before calling write f_ops, call file_start_write() instead of sb_start_write(). Replace {sb,file}_start_write() for {copy,clone}_file_range() and for fallocate(). Beyond correct semantics, this avoids freeze protection to sb when operating on special inodes, such as fallocate() on a blockdev. Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2017-02-07vfs: deny copy_file_range() for non regular filesAmir Goldstein1-0/+5
There is no in-tree file system that implements copy_file_range() for non regular files. Deny an attempt to copy_file_range() a directory with EISDIR and any other non regualr file with EINVAL to conform with behavior of vfs_{clone,dedup}_file_range(). This change is needed prior to converting sb_start_write() to file_start_write() in the vfs helper. Cc: linux-api@vger.kernel.org Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-12-24Replace <asm/uaccess.h> with <linux/uaccess.h> globallyLinus Torvalds1-1/+1
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-22vfs: fix isize/pos/len checks for reflink & dedupeDarrick J. Wong1-7/+11
Strengthen the checking of pos/len vs. i_size, clarify the return values for the clone prep function, and remove pointless code. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-12-17Merge branch 'for-linus' of ↵Linus Torvalds1-5/+226
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull more vfs updates from Al Viro: "In this pile: - autofs-namespace series - dedupe stuff - more struct path constification" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (40 commits) ocfs2: implement the VFS clone_range, copy_range, and dedupe_range features ocfs2: charge quota for reflinked blocks ocfs2: fix bad pointer cast ocfs2: always unlock when completing dio writes ocfs2: don't eat io errors during _dio_end_io_write ocfs2: budget for extent tree splits when adding refcount flag ocfs2: prohibit refcounted swapfiles ocfs2: add newlines to some error messages ocfs2: convert inode refcount test to a helper simple_write_end(): don't zero in short copy into uptodate exofs: don't mess with simple_write_{begin,end} 9p: saner ->write_end() on failing copy into non-uptodate page fix gfs2_stuffed_write_end() on short copies fix ceph_write_end() nfs_write_end(): fix handling of short copies vfs: refactor clone/dedupe_file_range common functions fs: try to clone files first in vfs_copy_file_range vfs: misc struct path constification namespace.c: constify struct path passed to a bunch of primitives quota: constify struct path in quota_on ...
2016-12-16vfs: fix vfs_clone_file_range() for overlayfs filesAmir Goldstein1-5/+5
With overlayfs, it is wrong to compare file_inode(inode)->i_sb of regular files with those of non-regular files, because the former reference the real (upper/lower) sb and the latter reference the overlayfs sb. Move the test for same super block after the sanity tests for clone range of directory and non-regular file. This change fixes xfstest generic/157, which returned EXDEV instead of EISDIR/EINVAL in the following test cases over overlayfs: echo "Try to reflink a dir" _reflink_range $testdir1/dir1 0 $testdir1/file2 0 $blksz echo "Try to reflink a device" _reflink_range $testdir1/dev1 0 $testdir1/file2 0 $blksz Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-12-16vfs: call vfs_clone_file_range() under freeze protectionAmir Goldstein1-3/+0
Move sb_start_write()/sb_end_write() out of the vfs helper and up into the ioctl handler. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-12-16vfs: allow vfs_clone_file_range() across mount pointsAmir Goldstein1-2/+6
FICLONE/FICLONERANGE ioctls return -EXDEV if src and dest files are not on the same mount point. Practically, clone only requires that src and dest files are on the same file system. Move the check for same mount point to ioctl handler and keep only the check for same super block in the vfs helper. A following patch is going to use the vfs_clone_file_range() helper in overlayfs to copy up between lower and upper mount points on the same file system. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-12-16vfs: no mnt_want_write_file() in vfs_{copy,clone}_file_range()Miklos Szeredi1-8/+4
We've checked for file_out being opened for write. This ensures that we already have mnt_want_write() on target. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-12-09vfs: refactor clone/dedupe_file_range common functionsDarrick J. Wong1-0/+204
Hoist both the XFS reflink inode state and preparation code and the XFS file blocks compare functions into the VFS so that ocfs2 can take advantage of it for reflink and dedupe. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2016-12-09fs: try to clone files first in vfs_copy_file_rangeChristoph Hellwig1-5/+22
A clone is a perfectly fine implementation of a file copy, so most file systems just implement the copy that way. Instead of duplicating this logic move it to the VFS. Currently btrfs and XFS implement copies the same way as clones and there is no behavior change for them, cifs only implements clones and grow support for copy_file_range with this patch. NFS implements both, so this will allow copy_file_range to work on servers that only implement CLONE and be lot more efficient on servers that implements CLONE and COPY. Signed-off-by: Christoph Hellwig <hch@lst.de>
2016-10-14iov_iter: kernel-doc import_iovec() and rw_copy_check_uvector()Vegard Nossum1-0/+29
Both import_iovec() and rw_copy_check_uvector() take an array (typically small and on-stack) which is used to hold an iovec array copy from userspace. This is to avoid an expensive memory allocation in the fast path (i.e. few iovec elements). The caller may have to check whether these functions actually used the provided buffer or allocated a new one -- but this differs between the too. Let's just add a kernel doc to clarify what the semantics are for each function. Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-07-15x86/syscalls: Add compat_sys_preadv64v2/compat_sys_pwritev64v2H.J. Lu1-0/+18
Don't use the same syscall numbers for 2 different syscalls: 534 x32 preadv compat_sys_preadv64 535 x32 pwritev compat_sys_pwritev64 534 x32 preadv2 compat_sys_preadv2 535 x32 pwritev2 compat_sys_pwritev2 Add compat_sys_preadv64v2() and compat_sys_pwritev64v2() so that 64-bit offset is passed in one 64-bit register on x32, similar to compat_sys_preadv64() and compat_sys_pwritev64(). Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/CAMe9rOovCMf-RQfx_n1U_Tu_DX1BYkjtFr%3DQ4-_PFVSj9BCzUA@mail.gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-05-18Merge branch 'work.iov_iter' of ↵Linus Torvalds1-19/+14
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull iov_iter cleanups from Al Viro. * 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fold checks into iterate_and_advance() rw_verify_area(): saner calling conventions aio: remove a pointless assignment
2016-05-17Merge branch 'work.preadv2' of ↵Linus Torvalds1-1/+5
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs cleanups from Al Viro: "More cleanups from Christoph" * 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: nfsd: use RWF_SYNC fs: add RWF_DSYNC aand RWF_SYNC ceph: use generic_write_sync fs: simplify the generic_write_sync prototype fs: add IOCB_SYNC and IOCB_DSYNC direct-io: remove the offset argument to dio_complete direct-io: eliminate the offset argument to ->direct_IO xfs: eliminate the pos variable in xfs_file_dio_aio_write filemap: remove the pos argument to generic_file_direct_write filemap: remove pos variables in generic_file_read_iter
2016-05-02give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()Al Viro1-12/+0
same as read() on regular files has, and for the same reason. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-05-01fs: add RWF_DSYNC aand RWF_SYNCChristoph Hellwig1-1/+5
This is the per-I/O equivalent of O_DSYNC and O_SYNC, and very useful for all kinds of file servers and storage targets. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-04-03rw_verify_area(): saner calling conventionsAl Viro1-19/+14
Lift length capping into the few callers that care about it. Most of them treat all non-negatives as "success" and ignore the capped value, and with good reasons. Make rw_verify_area() return 0 on success. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-03-18Merge branches 'work.lookups', 'work.misc' and 'work.preadv2' into for-nextAl Viro1-48/+149
2016-03-04vfs: add the RWF_HIPRI flag for preadv2/pwritev2Christoph Hellwig1-2/+4
This adds a flag that tells the file system that this is a high priority request for which it's worth to poll the hardware. The flag is purely advisory and can be ignored if not supported. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stephen Bates <stephen.bates@pmcs.com> Tested-by: Stephen Bates <stephen.bates@pmcs.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-03-04vfs: vfs: Define new syscalls preadv2,pwritev2Milosz Tanski1-35/+126
New syscalls that take an flag argument. No flags are added yet in this patch. Signed-off-by: Milosz Tanski <milosz@adfin.com> [hch: rebased on top of my kiocb changes] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stephen Bates <stephen.bates@pmcs.com> Tested-by: Stephen Bates <stephen.bates@pmcs.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-03-04vfs: pass a flags argument to vfs_readv/vfs_writevChristoph Hellwig1-18/+26
This way we can set kiocb flags also from the sync read/write path for the read_iter/write_iter operations. For now there is no way to pass flags to plain read/write operations as there is no real need for that, and all flags passed are explicitly rejected for these files. Signed-off-by: Milosz Tanski <milosz@adfin.com> [hch: rebased on top of my kiocb changes] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stephen Bates <stephen.bates@pmcs.com> Tested-by: Stephen Bates <stephen.bates@pmcs.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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