[37/52] fuse: multiplex cached/direct_io/dax file operations

Message ID	20181210171318.16998-38-vgoyal@redhat.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <kvm-owner@kernel.org> From: Vivek Goyal <vgoyal@redhat.com> To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, sweil@redhat.com, swhiteho@redhat.com Subject: [PATCH 37/52] fuse: multiplex cached/direct_io/dax file operations Date: Mon, 10 Dec 2018 12:13:03 -0500 Message-Id: <20181210171318.16998-38-vgoyal@redhat.com> In-Reply-To: <20181210171318.16998-1-vgoyal@redhat.com> References: <20181210171318.16998-1-vgoyal@redhat.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk
Series	virtio-fs: shared file system for virtual machines \| expand [00/52,RFC] virtio-fs: shared file system for virtual machines [01/52] fuse: add skeleton virtio_fs.ko module [02/52] fuse: add probe/remove virtio driver [03/52] fuse: rely on mutex_unlock() barrier instead of fput() [04/52] fuse: extract fuse_fill_super_common() [05/52] virtio_fs: get mount working [06/52] fuse: export fuse_end_request() [07/52] fuse: export fuse_len_args() [08/52] fuse: add fuse_iqueue_ops callbacks [09/52] fuse: process requests queues [10/52] fuse: export fuse_get_unique() [11/52] fuse: implement FUSE_FORGET for virtio-fs [12/52] virtio_fs: Set up dax_device [13/52] dax: remove block device dependencies [14/52] fuse: add fuse_conn->dax_dev field [15/52] fuse: map virtio_fs DAX window BAR [16/52] virtio-fs: Add VIRTIO_PCI_CAP_SHARED_MEMORY_CFG and utility to find them [17/52] virtio-fs: Retrieve shm capabilities for cache [18/52] virtio-fs: Map cache using the values from the capabilities [19/52] virito-fs: Make dax optional [20/52] Limit number of pages returned by direct_access() [21/52] fuse: Introduce fuse_dax_mapping [22/52] Create a list of free memory ranges [23/52] fuse: simplify fuse_fill_super_common() calling [24/52] fuse: Introduce setupmapping/removemapping commands [25/52] Introduce interval tree basic data structures [26/52] fuse: Implement basic DAX read/write support commands [27/52] fuse: Maintain a list of busy elements [28/52] Do fallocate() to grow file before mapping for file growing writes [29/52] fuse: add DAX mmap support [30/52] fuse: delete dentry if timeout is zero [31/52] dax: Pass dax_dev to dax_writeback_mapping_range() [32/52] fuse: Define dax address space operations [33/52] fuse, dax: Take ->i_mmap_sem lock during dax page fault [34/52] fuse: Add logic to free up a memory range [35/52] fuse: Add logic to do direct reclaim of memory [36/52] fuse: Kick worker when free memory drops below 20% of total ranges [37/52] fuse: multiplex cached/direct_io/dax file operations [38/52] Dispatch FORGET requests later instead of dropping them [39/52] Release file in process context [40/52] fuse: Do not block on inode lock while freeing memory range [41/52] fuse: Reschedule dax free work if too many EAGAIN attempts [42/52] fuse: Wait for memory ranges to become free [43/52] fuse: Take inode lock for dax inode truncation [44/52] fuse: Clear setuid bit even in direct I/O path [45/52] virtio: Free fuse devices on umount [46/52] virtio-fs: Retrieve shm capabilities for version table [47/52] virtio-fs: Map using the values from the capabilities [48/52] virtio-fs: pass version table pointer to fuse [49/52] fuse: don't crash if version table is NULL [50/52] fuse: add shared version support (virtio-fs only) [51/52] fuse: shared version cleanups [52/52] fuse: fix fuse_permission() for the default_permissions case

diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 1f172d372eeb..6421c94cef46 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -22,8 +22,6 @@ #include <linux/iomap.h> #include <linux/interval_tree_generic.h> -static const struct file_operations fuse_direct_io_file_operations; - INTERVAL_TREE_DEFINE(struct fuse_dax_mapping, rb, __u64, __subtree_last, START, LAST, static inline, fuse_dax_interval_tree); @@ -381,8 +379,6 @@ void fuse_finish_open(struct inode *inode, struct file *file) struct fuse_file *ff = file->private_data; struct fuse_conn *fc = get_fuse_conn(inode); - if (ff->open_flags & FOPEN_DIRECT_IO) - file->f_op = &fuse_direct_io_file_operations; if (!(ff->open_flags & FOPEN_KEEP_CACHE)) invalidate_inode_pages2(inode->i_mapping); if (ff->open_flags & FOPEN_NONSEEKABLE) @@ -1121,11 +1117,23 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, return err; } + +static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to); +static ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to); + static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to) { - struct inode *inode = iocb->ki_filp->f_mapping->host; + struct file *file = iocb->ki_filp; + struct fuse_file *ff = file->private_data; + struct inode *inode = file->f_mapping->host; struct fuse_conn *fc = get_fuse_conn(inode); + if (ff->open_flags & FOPEN_DIRECT_IO) + return fuse_direct_read_iter(iocb, to); + + if (IS_DAX(inode)) + return fuse_dax_read_iter(iocb, to); + /* * In auto invalidate mode, always update attributes on read. * Otherwise, only update if we attempt to read past EOF (to ensure @@ -1375,9 +1383,14 @@ static ssize_t fuse_perform_write(struct kiocb *iocb, return res > 0 ? res : err; } +static ssize_t fuse_direct_write_iter(struct kiocb *iocb, + struct iov_iter *from); +static ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from); + static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp; + struct fuse_file *ff = file->private_data; struct address_space *mapping = file->f_mapping; ssize_t written = 0; ssize_t written_buffered = 0; @@ -1385,6 +1398,11 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) ssize_t err; loff_t endbyte = 0; + if (ff->open_flags & FOPEN_DIRECT_IO) + return fuse_direct_write_iter(iocb, from); + if (IS_DAX(inode)) + return fuse_dax_write_iter(iocb, from); + if (get_fuse_conn(inode)->writeback_cache) { /* Update size (EOF optimization) and mode (SUID clearing) */ err = fuse_update_attributes(mapping->host, file); @@ -2517,8 +2535,20 @@ static const struct vm_operations_struct fuse_file_vm_ops = { .page_mkwrite = fuse_page_mkwrite, }; +static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma); +static int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma); + static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) { + struct fuse_file *ff = file->private_data; + + /* DAX mmap is superior to direct_io mmap */ + if (IS_DAX(file_inode(file))) + return fuse_dax_mmap(file, vma); + + if (ff->open_flags & FOPEN_DIRECT_IO) + return fuse_direct_mmap(file, vma); + if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) fuse_link_write_file(file); @@ -2538,6 +2568,18 @@ static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) return generic_file_mmap(file, vma); } +static ssize_t fuse_file_splice_read(struct file *in, loff_t *ppos, + struct pipe_inode_info *pipe, size_t len, + unsigned int flags) +{ + struct fuse_file *ff = in->private_data; + + if (ff->open_flags & FOPEN_DIRECT_IO) + return default_file_splice_read(in, ppos, pipe, len, flags); + else + return generic_file_splice_read(in, ppos, pipe, len, flags); + +} static int __fuse_dax_fault(struct vm_fault *vmf, enum page_entry_size pe_size, bool write) { @@ -3629,13 +3671,13 @@ static const struct file_operations fuse_file_operations = { .read_iter = fuse_file_read_iter, .write_iter = fuse_file_write_iter, .mmap = fuse_file_mmap, + .splice_read = fuse_file_splice_read, .open = fuse_open, .flush = fuse_flush, .release = fuse_release, .fsync = fuse_fsync, .lock = fuse_file_lock, .flock = fuse_file_flock, - .splice_read = generic_file_splice_read, .unlocked_ioctl = fuse_file_ioctl, .compat_ioctl = fuse_file_compat_ioctl, .poll = fuse_file_poll, @@ -3643,42 +3685,6 @@ static const struct file_operations fuse_file_operations = { .copy_file_range = fuse_copy_file_range, }; -static const struct file_operations fuse_direct_io_file_operations = { - .llseek = fuse_file_llseek, - .read_iter = fuse_direct_read_iter, - .write_iter = fuse_direct_write_iter, - .mmap = fuse_direct_mmap, - .open = fuse_open, - .flush = fuse_flush, - .release = fuse_release, - .fsync = fuse_fsync, - .lock = fuse_file_lock, - .flock = fuse_file_flock, - .unlocked_ioctl = fuse_file_ioctl, - .compat_ioctl = fuse_file_compat_ioctl, - .poll = fuse_file_poll, - .fallocate = fuse_file_fallocate, - /* no splice_read */ -}; - -static const struct file_operations fuse_dax_file_operations = { - .llseek = fuse_file_llseek, - .read_iter = fuse_dax_read_iter, - .write_iter = fuse_dax_write_iter, - .mmap = fuse_dax_mmap, - .open = fuse_open, - .flush = fuse_flush, - .release = fuse_release, - .fsync = fuse_fsync, - .lock = fuse_file_lock, - .flock = fuse_file_flock, - .unlocked_ioctl = fuse_file_ioctl, - .compat_ioctl = fuse_file_compat_ioctl, - .poll = fuse_file_poll, - .fallocate = fuse_file_fallocate, - /* no splice_read */ -}; - static const struct address_space_operations fuse_file_aops = { .readpage = fuse_readpage, .writepage = fuse_writepage, @@ -3716,7 +3722,6 @@ void fuse_init_file_inode(struct inode *inode) if (fc->dax_dev) { inode->i_flags |= S_DAX; - inode->i_fop = &fuse_dax_file_operations; inode->i_data.a_ops = &fuse_dax_file_aops; } } diff --git a/fs/splice.c b/fs/splice.c index 3553f1956508..93cbb03a70b1 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -365,7 +365,7 @@ static ssize_t kernel_readv(struct file *file, const struct kvec *vec, return res; } -static ssize_t default_file_splice_read(struct file *in, loff_t *ppos, +ssize_t default_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags) { @@ -429,6 +429,7 @@ static ssize_t default_file_splice_read(struct file *in, loff_t *ppos, iov_iter_advance(&to, copied); /* truncates and discards */ return res; } +EXPORT_SYMBOL(default_file_splice_read); /* * Send 'sd->len' bytes to socket from 'sd->file' at position 'sd->pos' diff --git a/include/linux/fs.h b/include/linux/fs.h index c95c0807471f..574e63b58a6f 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3040,6 +3040,8 @@ extern void block_sync_page(struct page *page); /* fs/splice.c */ extern ssize_t generic_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); +extern ssize_t default_file_splice_read(struct file *, loff_t *, + struct pipe_inode_info *, size_t, unsigned int); extern ssize_t iter_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,

[37/52] fuse: multiplex cached/direct_io/dax file operations

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