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* Merge branch 'for-linus' of ↵Linus Torvalds2014-06-1277-1516/+1004
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs updates from Al Viro: "This the bunch that sat in -next + lock_parent() fix. This is the minimal set; there's more pending stuff. In particular, I really hope to get acct.c fixes merged this cycle - we need that to deal sanely with delayed-mntput stuff. In the next pile, hopefully - that series is fairly short and localized (kernel/acct.c, fs/super.c and fs/namespace.c). In this pile: more iov_iter work. Most of prereqs for ->splice_write with sane locking order are there and Kent's dio rewrite would also fit nicely on top of this pile" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (70 commits) lock_parent: don't step on stale ->d_parent of all-but-freed one kill generic_file_splice_write() ceph: switch to iter_file_splice_write() shmem: switch to iter_file_splice_write() nfs: switch to iter_splice_write_file() fs/splice.c: remove unneeded exports ocfs2: switch to iter_file_splice_write() ->splice_write() via ->write_iter() bio_vec-backed iov_iter optimize copy_page_{to,from}_iter() bury generic_file_aio_{read,write} lustre: get rid of messing with iovecs ceph: switch to ->write_iter() ceph_sync_direct_write: stop poking into iov_iter guts ceph_sync_read: stop poking into iov_iter guts new helper: copy_page_from_iter() fuse: switch to ->write_iter() btrfs: switch to ->write_iter() ocfs2: switch to ->write_iter() xfs: switch to ->write_iter() ...
| * lock_parent: don't step on stale ->d_parent of all-but-freed oneAl Viro2014-06-121-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dentry that had been through (or into) __dentry_kill() might be seen by shrink_dentry_list(); that's normal, it'll be taken off the shrink list and freed if __dentry_kill() has already finished. The problem is, its ->d_parent might be pointing to already freed dentry, so lock_parent() needs to be careful. We need to check that dentry hasn't already gone into __dentry_kill() *and* grab rcu_read_lock() before dropping ->d_lock - the latter makes sure that whatever we see in ->d_parent after dropping ->d_lock it won't be freed until we drop rcu_read_lock(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * Merge commit '9f12600fe425bc28f0ccba034a77783c09c15af4' into for-linusAl Viro2014-06-1229-218/+370
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | Backmerge of dcache.c changes from mainline. It's that, or complete rebase... Conflicts: fs/splice.c Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | kill generic_file_splice_write()Al Viro2014-06-121-124/+0
| | | | | | | | | | | | | | | | | | no callers left Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ceph: switch to iter_file_splice_write()Al Viro2014-06-121-1/+1
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | nfs: switch to iter_splice_write_file()Al Viro2014-06-123-34/+2
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | fs/splice.c: remove unneeded exportsAl Viro2014-06-121-10/+5
| | | | | | | | | | | | | | | | | | ocfs2 was using a bunch of splice.c guts... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ocfs2: switch to iter_file_splice_write()Al Viro2014-06-121-80/+2
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ->splice_write() via ->write_iter()Al Viro2014-06-1215-56/+154
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | iter_file_splice_write() - a ->splice_write() instance that gathers the pipe buffers, builds a bio_vec-based iov_iter covering those and feeds it to ->write_iter(). A bunch of simple cases coverted to that... [AV: fixed the braino spotted by Cyrill] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | bio_vec-backed iov_iterAl Viro2014-05-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | New variant of iov_iter - ITER_BVEC in iter->type, backed with bio_vec array instead of iovec one. Primitives taught to deal with such beasts, __swap_write() switched to using that kind of iov_iter. Note that bio_vec is just a <page, offset, length> triple - there's nothing block-specific about it. I've left the definition where it was, but took it from under ifdef CONFIG_BLOCK. Next target: ->splice_write()... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ceph: switch to ->write_iter()Al Viro2014-05-061-31/+26
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ceph_sync_direct_write: stop poking into iov_iter gutsAl Viro2014-05-061-26/+23
| | | | | | | | | | | | | | | | | | all needed primitives are there... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ceph_sync_read: stop poking into iov_iter gutsAl Viro2014-05-061-28/+18
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | new helper: copy_page_from_iter()Al Viro2014-05-061-110/+19
| | | | | | | | | | | | | | | | | | | | | parallel to copy_page_to_iter(). pipe_write() switched to it (and became ->write_iter()). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | fuse: switch to ->write_iter()Al Viro2014-05-061-16/+11
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | btrfs: switch to ->write_iter()Al Viro2014-05-061-14/+10
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ocfs2: switch to ->write_iter()Al Viro2014-05-061-18/+12
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | xfs: switch to ->write_iter()Al Viro2014-05-061-20/+9
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | afs: switch to ->write_iter()Al Viro2014-05-063-10/+8
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | gfs2: switch to ->write_iter()Al Viro2014-05-061-10/+8
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | nfs: switch to ->write_iter()Al Viro2014-05-063-12/+10
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | ubifs: switch to ->write_iter()Al Viro2014-05-061-12/+7
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | cifs: switch to ->write_iter()Al Viro2014-05-063-42/+35
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | udf: switch to ->write_iter()Al Viro2014-05-061-6/+5
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | convert ext4 to ->write_iter()Al Viro2014-05-061-18/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | unfortunately, Ted's changes to ext4_file_write() are *still* an incomplete fix - playing with rlimits can let you smuggle an unaligned request past the checks. So there almost certainly will be more merge PITA around that place... [fix from Peter Ujfalusi <peter.ujfalusi@ti.com> folded] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | Merge ext4 changes in ext4_file_write() into for-nextAl Viro2014-05-068-245/+240
| |\ \ | | | | | | | | | | | | From ext4.git#dev, needed for switch of ext4 to ->write_iter() ;-/
| * | | blkdev_aio_write() - turn into blkdev_write_iter()Al Viro2014-05-061-10/+6
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | write_iter variants of {__,}generic_file_aio_write()Al Viro2014-05-0625-52/+52
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | ceph: switch to ->read_iter()Al Viro2014-05-061-11/+7
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | nfs: switch to ->read_iter()Al Viro2014-05-063-14/+9
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | fs/block_dev.c: switch to ->read_iter()Al Viro2014-05-061-10/+6
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | pipe: switch to ->read_iter()Al Viro2014-05-061-11/+5
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | cifs: switch to ->read_iter()Al Viro2014-05-063-32/+22
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | fuse_file_aio_read(): convert to ->read_iter()Al Viro2014-05-061-6/+5
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | ocfs2: switch to ->read_iter()Al Viro2014-05-061-11/+10
| | | | | | | | | | | | | | | | | | | | | | | | tracepoints are evil, exhibit #6969... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | ecryptfs: switch to ->read_iter()Al Viro2014-05-061-5/+4
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | xfs: switch to ->read_iter()Al Viro2014-05-061-12/+7
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | switch simple generic_file_aio_read() users to ->read_iter()Al Viro2014-05-0634-73/+73
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | new methods: ->read_iter() and ->write_iter()Al Viro2014-05-064-11/+105
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Beginning to introduce those. Just the callers for now, and it's clumsier than it'll eventually become; once we finish converting aio_read and aio_write instances, the things will get nicer. For now, these guys are in parallel to ->aio_read() and ->aio_write(); they take iocb and iov_iter, with everything in iov_iter already validated. File offset is passed in iocb->ki_pos, iov/nr_segs - in iov_iter. Main concerns in that series are stack footprint and ability to split the damn thing cleanly. [fix from Peter Ujfalusi <peter.ujfalusi@ti.com> folded] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | replace checking for ->read/->aio_read presence with check in ->f_modeAl Viro2014-05-063-7/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since we are about to introduce new methods (read_iter/write_iter), the tests in a bunch of places would have to grow inconveniently. Check once (at open() time) and store results in ->f_mode as FMODE_CAN_READ and FMODE_CAN_WRITE resp. It might end up being a temporary measure - once everything switches from ->aio_{read,write} to ->{read,write}_iter it might make sense to return to open-coded checks. We'll see... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | xfs: trim the argument lists of xfs_file_{dio,buffered}_aio_write()Al Viro2014-05-061-19/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | pos is redundant (it's iocb->ki_pos), and iov/nr_segs/count are taken care of by lifting iov_iter into the caller. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | blkdev_aio_read(): switch to generic_file_read_iter(), get rid of iov_shorten()Al Viro2014-05-061-3/+6
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | iov_iter_truncate()Al Viro2014-05-064-28/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now It Can Be Done(tm) - we don't need to do iov_shorten() in generic_file_direct_write() anymore, now that all ->direct_IO() instances are converted to proper iov_iter methods and honour iter->count and iter->iov_offset properly. Get rid of count/ocount arguments of generic_file_direct_write(), while we are at it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | btrfs: switch check_direct_IO() to iov_iterAl Viro2014-05-061-25/+15
| | | | | | | | | | | | | | | | | | | | | | | | ... and don't open-code iov_iter_alignment() there Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | new helper: iov_iter_get_pages_alloc()Al Viro2014-05-061-202/+88
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | same as iov_iter_get_pages(), except that pages array is allocated (kmalloc if possible, vmalloc if that fails) and left for caller to free. Lustre and NFS ->direct_IO() switched to it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | new helper: iov_iter_npages()Al Viro2014-05-062-22/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | counts the pages covered by iov_iter, up to given limit. do_block_direct_io() and fuse_iter_npages() switched to it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | f2fs: switch to iov_iter_alignment()Al Viro2014-05-061-6/+5
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | fuse: switch to iov_iter_get_pages()Al Viro2014-05-061-21/+12
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | fuse: pull iov_iter initializations upAl Viro2014-05-063-30/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | ... to fuse_direct_{read,write}(). ->direct_IO() path uses the iov_iter passed by the caller instead. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | new helper: iov_iter_get_pages()Al Viro2014-05-061-73/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | iov_iter_get_pages(iter, pages, maxsize, &start) grabs references pinning the pages of up to maxsize of (contiguous) data from iter. Returns the amount of memory grabbed or -error. In case of success, the requested area begins at offset start in pages[0] and runs through pages[1], etc. Less than requested amount might be returned - either because the contiguous area in the beginning of iterator is smaller than requested, or because the kernel failed to pin that many pages. direct-io.c switched to using iov_iter_get_pages() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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