mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 18:41:00 +07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
Pull fuse update from Miklos Szeredi: "This series adds cached writeback support to fuse, improving write throughput" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: fuse: fix "uninitialized variable" warning fuse: Turn writeback cache on fuse: Fix O_DIRECT operations vs cached writeback misorder fuse: fuse_flush() should wait on writeback fuse: Implement write_begin/write_end callbacks fuse: restructure fuse_readpage() fuse: Flush files on wb close fuse: Trust kernel i_mtime only fuse: Trust kernel i_size only fuse: Connection bit for enabling writeback fuse: Prepare to handle short reads fuse: Linking file to inode helper
This commit is contained in:
Linus Torvalds
commit
d15fee814d
@ -95,7 +95,7 @@ static ssize_t cuse_read(struct file *file, char __user *buf, size_t count,
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struct iovec iov = { .iov_base = buf, .iov_len = count };
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struct fuse_io_priv io = { .async = 0, .file = file };
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return fuse_direct_io(&io, &iov, 1, count, &pos, 0);
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return fuse_direct_io(&io, &iov, 1, count, &pos, FUSE_DIO_CUSE);
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}
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static ssize_t cuse_write(struct file *file, const char __user *buf,
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@ -109,7 +109,8 @@ static ssize_t cuse_write(struct file *file, const char __user *buf,
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* No locking or generic_write_checks(), the server is
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* responsible for locking and sanity checks.
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*/
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return fuse_direct_io(&io, &iov, 1, count, &pos, 1);
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return fuse_direct_io(&io, &iov, 1, count, &pos,
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FUSE_DIO_WRITE | FUSE_DIO_CUSE);
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}
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static int cuse_open(struct inode *inode, struct file *file)
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119
fs/fuse/dir.c
119
fs/fuse/dir.c
@ -839,6 +839,14 @@ static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
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struct kstat *stat)
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{
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unsigned int blkbits;
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struct fuse_conn *fc = get_fuse_conn(inode);
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/* see the comment in fuse_change_attributes() */
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if (fc->writeback_cache && S_ISREG(inode->i_mode)) {
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attr->size = i_size_read(inode);
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attr->mtime = inode->i_mtime.tv_sec;
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attr->mtimensec = inode->i_mtime.tv_nsec;
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}
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stat->dev = inode->i_sb->s_dev;
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stat->ino = attr->ino;
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@ -1477,12 +1485,16 @@ static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
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FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
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}
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static bool update_mtime(unsigned ivalid)
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static bool update_mtime(unsigned ivalid, bool trust_local_mtime)
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{
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/* Always update if mtime is explicitly set */
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if (ivalid & ATTR_MTIME_SET)
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return true;
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/* Or if kernel i_mtime is the official one */
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if (trust_local_mtime)
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return true;
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/* If it's an open(O_TRUNC) or an ftruncate(), don't update */
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if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
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return false;
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@ -1491,7 +1503,8 @@ static bool update_mtime(unsigned ivalid)
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return true;
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}
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static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
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static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg,
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bool trust_local_mtime)
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{
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unsigned ivalid = iattr->ia_valid;
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@ -1510,11 +1523,11 @@ static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
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if (!(ivalid & ATTR_ATIME_SET))
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arg->valid |= FATTR_ATIME_NOW;
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}
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if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
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if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_mtime)) {
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arg->valid |= FATTR_MTIME;
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arg->mtime = iattr->ia_mtime.tv_sec;
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arg->mtimensec = iattr->ia_mtime.tv_nsec;
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if (!(ivalid & ATTR_MTIME_SET))
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if (!(ivalid & ATTR_MTIME_SET) && !trust_local_mtime)
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arg->valid |= FATTR_MTIME_NOW;
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}
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}
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@ -1563,6 +1576,63 @@ void fuse_release_nowrite(struct inode *inode)
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spin_unlock(&fc->lock);
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}
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static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_req *req,
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struct inode *inode,
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struct fuse_setattr_in *inarg_p,
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struct fuse_attr_out *outarg_p)
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{
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req->in.h.opcode = FUSE_SETATTR;
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req->in.h.nodeid = get_node_id(inode);
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req->in.numargs = 1;
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req->in.args[0].size = sizeof(*inarg_p);
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req->in.args[0].value = inarg_p;
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req->out.numargs = 1;
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if (fc->minor < 9)
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req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
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else
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req->out.args[0].size = sizeof(*outarg_p);
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req->out.args[0].value = outarg_p;
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}
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/*
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* Flush inode->i_mtime to the server
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*/
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int fuse_flush_mtime(struct file *file, bool nofail)
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{
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struct inode *inode = file->f_mapping->host;
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struct fuse_inode *fi = get_fuse_inode(inode);
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struct fuse_conn *fc = get_fuse_conn(inode);
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struct fuse_req *req = NULL;
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struct fuse_setattr_in inarg;
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struct fuse_attr_out outarg;
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int err;
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if (nofail) {
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req = fuse_get_req_nofail_nopages(fc, file);
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} else {
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req = fuse_get_req_nopages(fc);
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if (IS_ERR(req))
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return PTR_ERR(req);
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}
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memset(&inarg, 0, sizeof(inarg));
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memset(&outarg, 0, sizeof(outarg));
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inarg.valid |= FATTR_MTIME;
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inarg.mtime = inode->i_mtime.tv_sec;
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inarg.mtimensec = inode->i_mtime.tv_nsec;
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fuse_setattr_fill(fc, req, inode, &inarg, &outarg);
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fuse_request_send(fc, req);
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err = req->out.h.error;
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fuse_put_request(fc, req);
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if (!err)
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clear_bit(FUSE_I_MTIME_DIRTY, &fi->state);
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return err;
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}
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/*
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* Set attributes, and at the same time refresh them.
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*
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@ -1580,8 +1650,10 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr,
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struct fuse_setattr_in inarg;
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struct fuse_attr_out outarg;
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bool is_truncate = false;
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bool is_wb = fc->writeback_cache;
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loff_t oldsize;
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int err;
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bool trust_local_mtime = is_wb && S_ISREG(inode->i_mode);
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if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
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attr->ia_valid |= ATTR_FORCE;
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@ -1610,7 +1682,7 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr,
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memset(&inarg, 0, sizeof(inarg));
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memset(&outarg, 0, sizeof(outarg));
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iattr_to_fattr(attr, &inarg);
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iattr_to_fattr(attr, &inarg, trust_local_mtime);
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if (file) {
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struct fuse_file *ff = file->private_data;
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inarg.valid |= FATTR_FH;
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@ -1621,17 +1693,7 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr,
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inarg.valid |= FATTR_LOCKOWNER;
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inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
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}
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req->in.h.opcode = FUSE_SETATTR;
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req->in.h.nodeid = get_node_id(inode);
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req->in.numargs = 1;
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req->in.args[0].size = sizeof(inarg);
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req->in.args[0].value = &inarg;
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req->out.numargs = 1;
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if (fc->minor < 9)
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req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
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else
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req->out.args[0].size = sizeof(outarg);
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req->out.args[0].value = &outarg;
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fuse_setattr_fill(fc, req, inode, &inarg, &outarg);
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fuse_request_send(fc, req);
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err = req->out.h.error;
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fuse_put_request(fc, req);
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@ -1648,10 +1710,18 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr,
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}
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spin_lock(&fc->lock);
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/* the kernel maintains i_mtime locally */
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if (trust_local_mtime && (attr->ia_valid & ATTR_MTIME)) {
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inode->i_mtime = attr->ia_mtime;
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clear_bit(FUSE_I_MTIME_DIRTY, &fi->state);
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}
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fuse_change_attributes_common(inode, &outarg.attr,
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attr_timeout(&outarg));
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oldsize = inode->i_size;
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i_size_write(inode, outarg.attr.size);
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/* see the comment in fuse_change_attributes() */
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if (!is_wb || is_truncate || !S_ISREG(inode->i_mode))
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i_size_write(inode, outarg.attr.size);
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if (is_truncate) {
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/* NOTE: this may release/reacquire fc->lock */
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@ -1663,7 +1733,8 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr,
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* Only call invalidate_inode_pages2() after removing
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* FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
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*/
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if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
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if ((is_truncate || !is_wb) &&
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S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
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truncate_pagecache(inode, outarg.attr.size);
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invalidate_inode_pages2(inode->i_mapping);
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}
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@ -1875,6 +1946,17 @@ static int fuse_removexattr(struct dentry *entry, const char *name)
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return err;
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}
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static int fuse_update_time(struct inode *inode, struct timespec *now,
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int flags)
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{
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if (flags & S_MTIME) {
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inode->i_mtime = *now;
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set_bit(FUSE_I_MTIME_DIRTY, &get_fuse_inode(inode)->state);
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BUG_ON(!S_ISREG(inode->i_mode));
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}
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return 0;
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}
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static const struct inode_operations fuse_dir_inode_operations = {
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.lookup = fuse_lookup,
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.mkdir = fuse_mkdir,
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@ -1914,6 +1996,7 @@ static const struct inode_operations fuse_common_inode_operations = {
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.getxattr = fuse_getxattr,
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.listxattr = fuse_listxattr,
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.removexattr = fuse_removexattr,
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.update_time = fuse_update_time,
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};
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static const struct inode_operations fuse_symlink_inode_operations = {
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286
fs/fuse/file.c
286
fs/fuse/file.c
@ -188,6 +188,22 @@ int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
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}
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EXPORT_SYMBOL_GPL(fuse_do_open);
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static void fuse_link_write_file(struct file *file)
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{
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struct inode *inode = file_inode(file);
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struct fuse_conn *fc = get_fuse_conn(inode);
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struct fuse_inode *fi = get_fuse_inode(inode);
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struct fuse_file *ff = file->private_data;
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/*
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* file may be written through mmap, so chain it onto the
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* inodes's write_file list
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*/
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spin_lock(&fc->lock);
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if (list_empty(&ff->write_entry))
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list_add(&ff->write_entry, &fi->write_files);
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spin_unlock(&fc->lock);
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}
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void fuse_finish_open(struct inode *inode, struct file *file)
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{
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struct fuse_file *ff = file->private_data;
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@ -208,6 +224,8 @@ void fuse_finish_open(struct inode *inode, struct file *file)
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spin_unlock(&fc->lock);
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fuse_invalidate_attr(inode);
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}
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if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache)
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fuse_link_write_file(file);
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}
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int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
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@ -292,6 +310,15 @@ static int fuse_open(struct inode *inode, struct file *file)
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static int fuse_release(struct inode *inode, struct file *file)
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{
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struct fuse_conn *fc = get_fuse_conn(inode);
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/* see fuse_vma_close() for !writeback_cache case */
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if (fc->writeback_cache)
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filemap_write_and_wait(file->f_mapping);
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if (test_bit(FUSE_I_MTIME_DIRTY, &get_fuse_inode(inode)->state))
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fuse_flush_mtime(file, true);
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fuse_release_common(file, FUSE_RELEASE);
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/* return value is ignored by VFS */
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@ -333,12 +360,13 @@ u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
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}
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/*
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* Check if page is under writeback
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* Check if any page in a range is under writeback
|
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*
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* This is currently done by walking the list of writepage requests
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* for the inode, which can be pretty inefficient.
|
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*/
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static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
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static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from,
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pgoff_t idx_to)
|
||||
{
|
||||
struct fuse_conn *fc = get_fuse_conn(inode);
|
||||
struct fuse_inode *fi = get_fuse_inode(inode);
|
||||
@ -351,8 +379,8 @@ static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
|
||||
|
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BUG_ON(req->inode != inode);
|
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curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
|
||||
if (curr_index <= index &&
|
||||
index < curr_index + req->num_pages) {
|
||||
if (idx_from < curr_index + req->num_pages &&
|
||||
curr_index <= idx_to) {
|
||||
found = true;
|
||||
break;
|
||||
}
|
||||
@ -362,6 +390,11 @@ static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
|
||||
return found;
|
||||
}
|
||||
|
||||
static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
|
||||
{
|
||||
return fuse_range_is_writeback(inode, index, index);
|
||||
}
|
||||
|
||||
/*
|
||||
* Wait for page writeback to be completed.
|
||||
*
|
||||
@ -376,6 +409,21 @@ static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Wait for all pending writepages on the inode to finish.
|
||||
*
|
||||
* This is currently done by blocking further writes with FUSE_NOWRITE
|
||||
* and waiting for all sent writes to complete.
|
||||
*
|
||||
* This must be called under i_mutex, otherwise the FUSE_NOWRITE usage
|
||||
* could conflict with truncation.
|
||||
*/
|
||||
static void fuse_sync_writes(struct inode *inode)
|
||||
{
|
||||
fuse_set_nowrite(inode);
|
||||
fuse_release_nowrite(inode);
|
||||
}
|
||||
|
||||
static int fuse_flush(struct file *file, fl_owner_t id)
|
||||
{
|
||||
struct inode *inode = file_inode(file);
|
||||
@ -391,6 +439,14 @@ static int fuse_flush(struct file *file, fl_owner_t id)
|
||||
if (fc->no_flush)
|
||||
return 0;
|
||||
|
||||
err = filemap_write_and_wait(file->f_mapping);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
fuse_sync_writes(inode);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
req = fuse_get_req_nofail_nopages(fc, file);
|
||||
memset(&inarg, 0, sizeof(inarg));
|
||||
inarg.fh = ff->fh;
|
||||
@ -411,21 +467,6 @@ static int fuse_flush(struct file *file, fl_owner_t id)
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* Wait for all pending writepages on the inode to finish.
|
||||
*
|
||||
* This is currently done by blocking further writes with FUSE_NOWRITE
|
||||
* and waiting for all sent writes to complete.
|
||||
*
|
||||
* This must be called under i_mutex, otherwise the FUSE_NOWRITE usage
|
||||
* could conflict with truncation.
|
||||
*/
|
||||
static void fuse_sync_writes(struct inode *inode)
|
||||
{
|
||||
fuse_set_nowrite(inode);
|
||||
fuse_release_nowrite(inode);
|
||||
}
|
||||
|
||||
int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
|
||||
int datasync, int isdir)
|
||||
{
|
||||
@ -459,6 +500,12 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
|
||||
|
||||
fuse_sync_writes(inode);
|
||||
|
||||
if (test_bit(FUSE_I_MTIME_DIRTY, &get_fuse_inode(inode)->state)) {
|
||||
int err = fuse_flush_mtime(file, false);
|
||||
if (err)
|
||||
goto out;
|
||||
}
|
||||
|
||||
req = fuse_get_req_nopages(fc);
|
||||
if (IS_ERR(req)) {
|
||||
err = PTR_ERR(req);
|
||||
@ -655,7 +702,33 @@ static void fuse_read_update_size(struct inode *inode, loff_t size,
|
||||
spin_unlock(&fc->lock);
|
||||
}
|
||||
|
||||
static int fuse_readpage(struct file *file, struct page *page)
|
||||
static void fuse_short_read(struct fuse_req *req, struct inode *inode,
|
||||
u64 attr_ver)
|
||||
{
|
||||
size_t num_read = req->out.args[0].size;
|
||||
struct fuse_conn *fc = get_fuse_conn(inode);
|
||||
|
||||
if (fc->writeback_cache) {
|
||||
/*
|
||||
* A hole in a file. Some data after the hole are in page cache,
|
||||
* but have not reached the client fs yet. So, the hole is not
|
||||
* present there.
|
||||
*/
|
||||
int i;
|
||||
int start_idx = num_read >> PAGE_CACHE_SHIFT;
|
||||
size_t off = num_read & (PAGE_CACHE_SIZE - 1);
|
||||
|
||||
for (i = start_idx; i < req->num_pages; i++) {
|
||||
zero_user_segment(req->pages[i], off, PAGE_CACHE_SIZE);
|
||||
off = 0;
|
||||
}
|
||||
} else {
|
||||
loff_t pos = page_offset(req->pages[0]) + num_read;
|
||||
fuse_read_update_size(inode, pos, attr_ver);
|
||||
}
|
||||
}
|
||||
|
||||
static int fuse_do_readpage(struct file *file, struct page *page)
|
||||
{
|
||||
struct fuse_io_priv io = { .async = 0, .file = file };
|
||||
struct inode *inode = page->mapping->host;
|
||||
@ -667,10 +740,6 @@ static int fuse_readpage(struct file *file, struct page *page)
|
||||
u64 attr_ver;
|
||||
int err;
|
||||
|
||||
err = -EIO;
|
||||
if (is_bad_inode(inode))
|
||||
goto out;
|
||||
|
||||
/*
|
||||
* Page writeback can extend beyond the lifetime of the
|
||||
* page-cache page, so make sure we read a properly synced
|
||||
@ -679,9 +748,8 @@ static int fuse_readpage(struct file *file, struct page *page)
|
||||
fuse_wait_on_page_writeback(inode, page->index);
|
||||
|
||||
req = fuse_get_req(fc, 1);
|
||||
err = PTR_ERR(req);
|
||||
if (IS_ERR(req))
|
||||
goto out;
|
||||
return PTR_ERR(req);
|
||||
|
||||
attr_ver = fuse_get_attr_version(fc);
|
||||
|
||||
@ -692,18 +760,32 @@ static int fuse_readpage(struct file *file, struct page *page)
|
||||
req->page_descs[0].length = count;
|
||||
num_read = fuse_send_read(req, &io, pos, count, NULL);
|
||||
err = req->out.h.error;
|
||||
fuse_put_request(fc, req);
|
||||
|
||||
if (!err) {
|
||||
/*
|
||||
* Short read means EOF. If file size is larger, truncate it
|
||||
*/
|
||||
if (num_read < count)
|
||||
fuse_read_update_size(inode, pos + num_read, attr_ver);
|
||||
fuse_short_read(req, inode, attr_ver);
|
||||
|
||||
SetPageUptodate(page);
|
||||
}
|
||||
|
||||
fuse_put_request(fc, req);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fuse_readpage(struct file *file, struct page *page)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
int err;
|
||||
|
||||
err = -EIO;
|
||||
if (is_bad_inode(inode))
|
||||
goto out;
|
||||
|
||||
err = fuse_do_readpage(file, page);
|
||||
fuse_invalidate_atime(inode);
|
||||
out:
|
||||
unlock_page(page);
|
||||
@ -726,13 +808,9 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
|
||||
/*
|
||||
* Short read means EOF. If file size is larger, truncate it
|
||||
*/
|
||||
if (!req->out.h.error && num_read < count) {
|
||||
loff_t pos;
|
||||
if (!req->out.h.error && num_read < count)
|
||||
fuse_short_read(req, inode, req->misc.read.attr_ver);
|
||||
|
||||
pos = page_offset(req->pages[0]) + num_read;
|
||||
fuse_read_update_size(inode, pos,
|
||||
req->misc.read.attr_ver);
|
||||
}
|
||||
fuse_invalidate_atime(inode);
|
||||
}
|
||||
|
||||
@ -922,16 +1000,21 @@ static size_t fuse_send_write(struct fuse_req *req, struct fuse_io_priv *io,
|
||||
return req->misc.write.out.size;
|
||||
}
|
||||
|
||||
void fuse_write_update_size(struct inode *inode, loff_t pos)
|
||||
bool fuse_write_update_size(struct inode *inode, loff_t pos)
|
||||
{
|
||||
struct fuse_conn *fc = get_fuse_conn(inode);
|
||||
struct fuse_inode *fi = get_fuse_inode(inode);
|
||||
bool ret = false;
|
||||
|
||||
spin_lock(&fc->lock);
|
||||
fi->attr_version = ++fc->attr_version;
|
||||
if (pos > inode->i_size)
|
||||
if (pos > inode->i_size) {
|
||||
i_size_write(inode, pos);
|
||||
ret = true;
|
||||
}
|
||||
spin_unlock(&fc->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file,
|
||||
@ -1116,6 +1199,15 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
|
||||
struct iov_iter i;
|
||||
loff_t endbyte = 0;
|
||||
|
||||
if (get_fuse_conn(inode)->writeback_cache) {
|
||||
/* Update size (EOF optimization) and mode (SUID clearing) */
|
||||
err = fuse_update_attributes(mapping->host, NULL, file, NULL);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return generic_file_aio_write(iocb, iov, nr_segs, pos);
|
||||
}
|
||||
|
||||
WARN_ON(iocb->ki_pos != pos);
|
||||
|
||||
ocount = 0;
|
||||
@ -1289,13 +1381,18 @@ static inline int fuse_iter_npages(const struct iov_iter *ii_p)
|
||||
|
||||
ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
|
||||
unsigned long nr_segs, size_t count, loff_t *ppos,
|
||||
int write)
|
||||
int flags)
|
||||
{
|
||||
int write = flags & FUSE_DIO_WRITE;
|
||||
int cuse = flags & FUSE_DIO_CUSE;
|
||||
struct file *file = io->file;
|
||||
struct inode *inode = file->f_mapping->host;
|
||||
struct fuse_file *ff = file->private_data;
|
||||
struct fuse_conn *fc = ff->fc;
|
||||
size_t nmax = write ? fc->max_write : fc->max_read;
|
||||
loff_t pos = *ppos;
|
||||
pgoff_t idx_from = pos >> PAGE_CACHE_SHIFT;
|
||||
pgoff_t idx_to = (pos + count - 1) >> PAGE_CACHE_SHIFT;
|
||||
ssize_t res = 0;
|
||||
struct fuse_req *req;
|
||||
struct iov_iter ii;
|
||||
@ -1309,6 +1406,14 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
|
||||
if (IS_ERR(req))
|
||||
return PTR_ERR(req);
|
||||
|
||||
if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) {
|
||||
if (!write)
|
||||
mutex_lock(&inode->i_mutex);
|
||||
fuse_sync_writes(inode);
|
||||
if (!write)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
}
|
||||
|
||||
while (count) {
|
||||
size_t nres;
|
||||
fl_owner_t owner = current->files;
|
||||
@ -1397,7 +1502,8 @@ static ssize_t __fuse_direct_write(struct fuse_io_priv *io,
|
||||
|
||||
res = generic_write_checks(file, ppos, &count, 0);
|
||||
if (!res)
|
||||
res = fuse_direct_io(io, iov, nr_segs, count, ppos, 1);
|
||||
res = fuse_direct_io(io, iov, nr_segs, count, ppos,
|
||||
FUSE_DIO_WRITE);
|
||||
|
||||
fuse_invalidate_attr(inode);
|
||||
|
||||
@ -1885,6 +1991,77 @@ static int fuse_writepages(struct address_space *mapping,
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* It's worthy to make sure that space is reserved on disk for the write,
|
||||
* but how to implement it without killing performance need more thinking.
|
||||
*/
|
||||
static int fuse_write_begin(struct file *file, struct address_space *mapping,
|
||||
loff_t pos, unsigned len, unsigned flags,
|
||||
struct page **pagep, void **fsdata)
|
||||
{
|
||||
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
|
||||
struct fuse_conn *fc = get_fuse_conn(file->f_dentry->d_inode);
|
||||
struct page *page;
|
||||
loff_t fsize;
|
||||
int err = -ENOMEM;
|
||||
|
||||
WARN_ON(!fc->writeback_cache);
|
||||
|
||||
page = grab_cache_page_write_begin(mapping, index, flags);
|
||||
if (!page)
|
||||
goto error;
|
||||
|
||||
fuse_wait_on_page_writeback(mapping->host, page->index);
|
||||
|
||||
if (PageUptodate(page) || len == PAGE_CACHE_SIZE)
|
||||
goto success;
|
||||
/*
|
||||
* Check if the start this page comes after the end of file, in which
|
||||
* case the readpage can be optimized away.
|
||||
*/
|
||||
fsize = i_size_read(mapping->host);
|
||||
if (fsize <= (pos & PAGE_CACHE_MASK)) {
|
||||
size_t off = pos & ~PAGE_CACHE_MASK;
|
||||
if (off)
|
||||
zero_user_segment(page, 0, off);
|
||||
goto success;
|
||||
}
|
||||
err = fuse_do_readpage(file, page);
|
||||
if (err)
|
||||
goto cleanup;
|
||||
success:
|
||||
*pagep = page;
|
||||
return 0;
|
||||
|
||||
cleanup:
|
||||
unlock_page(page);
|
||||
page_cache_release(page);
|
||||
error:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fuse_write_end(struct file *file, struct address_space *mapping,
|
||||
loff_t pos, unsigned len, unsigned copied,
|
||||
struct page *page, void *fsdata)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
|
||||
if (!PageUptodate(page)) {
|
||||
/* Zero any unwritten bytes at the end of the page */
|
||||
size_t endoff = (pos + copied) & ~PAGE_CACHE_MASK;
|
||||
if (endoff)
|
||||
zero_user_segment(page, endoff, PAGE_CACHE_SIZE);
|
||||
SetPageUptodate(page);
|
||||
}
|
||||
|
||||
fuse_write_update_size(inode, pos + copied);
|
||||
set_page_dirty(page);
|
||||
unlock_page(page);
|
||||
page_cache_release(page);
|
||||
|
||||
return copied;
|
||||
}
|
||||
|
||||
static int fuse_launder_page(struct page *page)
|
||||
{
|
||||
int err = 0;
|
||||
@ -1946,20 +2123,9 @@ static const struct vm_operations_struct fuse_file_vm_ops = {
|
||||
|
||||
static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
|
||||
{
|
||||
if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) {
|
||||
struct inode *inode = file_inode(file);
|
||||
struct fuse_conn *fc = get_fuse_conn(inode);
|
||||
struct fuse_inode *fi = get_fuse_inode(inode);
|
||||
struct fuse_file *ff = file->private_data;
|
||||
/*
|
||||
* file may be written through mmap, so chain it onto the
|
||||
* inodes's write_file list
|
||||
*/
|
||||
spin_lock(&fc->lock);
|
||||
if (list_empty(&ff->write_entry))
|
||||
list_add(&ff->write_entry, &fi->write_files);
|
||||
spin_unlock(&fc->lock);
|
||||
}
|
||||
if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
|
||||
fuse_link_write_file(file);
|
||||
|
||||
file_accessed(file);
|
||||
vma->vm_ops = &fuse_file_vm_ops;
|
||||
return 0;
|
||||
@ -2606,7 +2772,7 @@ static void fuse_register_polled_file(struct fuse_conn *fc,
|
||||
{
|
||||
spin_lock(&fc->lock);
|
||||
if (RB_EMPTY_NODE(&ff->polled_node)) {
|
||||
struct rb_node **link, *parent;
|
||||
struct rb_node **link, *uninitialized_var(parent);
|
||||
|
||||
link = fuse_find_polled_node(fc, ff->kh, &parent);
|
||||
BUG_ON(*link);
|
||||
@ -2850,8 +3016,16 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
|
||||
goto out;
|
||||
|
||||
/* we could have extended the file */
|
||||
if (!(mode & FALLOC_FL_KEEP_SIZE))
|
||||
fuse_write_update_size(inode, offset + length);
|
||||
if (!(mode & FALLOC_FL_KEEP_SIZE)) {
|
||||
bool changed = fuse_write_update_size(inode, offset + length);
|
||||
|
||||
if (changed && fc->writeback_cache) {
|
||||
struct fuse_inode *fi = get_fuse_inode(inode);
|
||||
|
||||
inode->i_mtime = current_fs_time(inode->i_sb);
|
||||
set_bit(FUSE_I_MTIME_DIRTY, &fi->state);
|
||||
}
|
||||
}
|
||||
|
||||
if (mode & FALLOC_FL_PUNCH_HOLE)
|
||||
truncate_pagecache_range(inode, offset, offset + length - 1);
|
||||
@ -2915,6 +3089,8 @@ static const struct address_space_operations fuse_file_aops = {
|
||||
.set_page_dirty = __set_page_dirty_nobuffers,
|
||||
.bmap = fuse_bmap,
|
||||
.direct_IO = fuse_direct_IO,
|
||||
.write_begin = fuse_write_begin,
|
||||
.write_end = fuse_write_end,
|
||||
};
|
||||
|
||||
void fuse_init_file_inode(struct inode *inode)
|
||||
|
||||
@ -119,6 +119,8 @@ enum {
|
||||
FUSE_I_INIT_RDPLUS,
|
||||
/** An operation changing file size is in progress */
|
||||
FUSE_I_SIZE_UNSTABLE,
|
||||
/** i_mtime has been updated locally; a flush to userspace needed */
|
||||
FUSE_I_MTIME_DIRTY,
|
||||
};
|
||||
|
||||
struct fuse_conn;
|
||||
@ -480,6 +482,9 @@ struct fuse_conn {
|
||||
/** Set if bdi is valid */
|
||||
unsigned bdi_initialized:1;
|
||||
|
||||
/** write-back cache policy (default is write-through) */
|
||||
unsigned writeback_cache:1;
|
||||
|
||||
/*
|
||||
* The following bitfields are only for optimization purposes
|
||||
* and hence races in setting them will not cause malfunction
|
||||
@ -863,9 +868,20 @@ int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
|
||||
|
||||
int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
|
||||
bool isdir);
|
||||
|
||||
/**
|
||||
* fuse_direct_io() flags
|
||||
*/
|
||||
|
||||
/** If set, it is WRITE; otherwise - READ */
|
||||
#define FUSE_DIO_WRITE (1 << 0)
|
||||
|
||||
/** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
|
||||
#define FUSE_DIO_CUSE (1 << 1)
|
||||
|
||||
ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov,
|
||||
unsigned long nr_segs, size_t count, loff_t *ppos,
|
||||
int write);
|
||||
int flags);
|
||||
long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
|
||||
unsigned int flags);
|
||||
long fuse_ioctl_common(struct file *file, unsigned int cmd,
|
||||
@ -873,7 +889,9 @@ long fuse_ioctl_common(struct file *file, unsigned int cmd,
|
||||
unsigned fuse_file_poll(struct file *file, poll_table *wait);
|
||||
int fuse_dev_release(struct inode *inode, struct file *file);
|
||||
|
||||
void fuse_write_update_size(struct inode *inode, loff_t pos);
|
||||
bool fuse_write_update_size(struct inode *inode, loff_t pos);
|
||||
|
||||
int fuse_flush_mtime(struct file *file, bool nofail);
|
||||
|
||||
int fuse_do_setattr(struct inode *inode, struct iattr *attr,
|
||||
struct file *file);
|
||||
|
||||
@ -170,8 +170,11 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
|
||||
inode->i_blocks = attr->blocks;
|
||||
inode->i_atime.tv_sec = attr->atime;
|
||||
inode->i_atime.tv_nsec = attr->atimensec;
|
||||
inode->i_mtime.tv_sec = attr->mtime;
|
||||
inode->i_mtime.tv_nsec = attr->mtimensec;
|
||||
/* mtime from server may be stale due to local buffered write */
|
||||
if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) {
|
||||
inode->i_mtime.tv_sec = attr->mtime;
|
||||
inode->i_mtime.tv_nsec = attr->mtimensec;
|
||||
}
|
||||
inode->i_ctime.tv_sec = attr->ctime;
|
||||
inode->i_ctime.tv_nsec = attr->ctimensec;
|
||||
|
||||
@ -197,6 +200,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
|
||||
{
|
||||
struct fuse_conn *fc = get_fuse_conn(inode);
|
||||
struct fuse_inode *fi = get_fuse_inode(inode);
|
||||
bool is_wb = fc->writeback_cache;
|
||||
loff_t oldsize;
|
||||
struct timespec old_mtime;
|
||||
|
||||
@ -211,10 +215,16 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
|
||||
fuse_change_attributes_common(inode, attr, attr_valid);
|
||||
|
||||
oldsize = inode->i_size;
|
||||
i_size_write(inode, attr->size);
|
||||
/*
|
||||
* In case of writeback_cache enabled, the cached writes beyond EOF
|
||||
* extend local i_size without keeping userspace server in sync. So,
|
||||
* attr->size coming from server can be stale. We cannot trust it.
|
||||
*/
|
||||
if (!is_wb || !S_ISREG(inode->i_mode))
|
||||
i_size_write(inode, attr->size);
|
||||
spin_unlock(&fc->lock);
|
||||
|
||||
if (S_ISREG(inode->i_mode)) {
|
||||
if (!is_wb && S_ISREG(inode->i_mode)) {
|
||||
bool inval = false;
|
||||
|
||||
if (oldsize != attr->size) {
|
||||
@ -243,6 +253,8 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
|
||||
{
|
||||
inode->i_mode = attr->mode & S_IFMT;
|
||||
inode->i_size = attr->size;
|
||||
inode->i_mtime.tv_sec = attr->mtime;
|
||||
inode->i_mtime.tv_nsec = attr->mtimensec;
|
||||
if (S_ISREG(inode->i_mode)) {
|
||||
fuse_init_common(inode);
|
||||
fuse_init_file_inode(inode);
|
||||
@ -289,7 +301,9 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
|
||||
return NULL;
|
||||
|
||||
if ((inode->i_state & I_NEW)) {
|
||||
inode->i_flags |= S_NOATIME|S_NOCMTIME;
|
||||
inode->i_flags |= S_NOATIME;
|
||||
if (!fc->writeback_cache || !S_ISREG(inode->i_mode))
|
||||
inode->i_flags |= S_NOCMTIME;
|
||||
inode->i_generation = generation;
|
||||
inode->i_data.backing_dev_info = &fc->bdi;
|
||||
fuse_init_inode(inode, attr);
|
||||
@ -873,6 +887,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
|
||||
}
|
||||
if (arg->flags & FUSE_ASYNC_DIO)
|
||||
fc->async_dio = 1;
|
||||
if (arg->flags & FUSE_WRITEBACK_CACHE)
|
||||
fc->writeback_cache = 1;
|
||||
} else {
|
||||
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
|
||||
fc->no_lock = 1;
|
||||
@ -900,7 +916,8 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
|
||||
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
|
||||
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
|
||||
FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
|
||||
FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO;
|
||||
FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
|
||||
FUSE_WRITEBACK_CACHE;
|
||||
req->in.h.opcode = FUSE_INIT;
|
||||
req->in.numargs = 1;
|
||||
req->in.args[0].size = sizeof(*arg);
|
||||
|
||||
@ -93,6 +93,9 @@
|
||||
*
|
||||
* 7.22
|
||||
* - add FUSE_ASYNC_DIO
|
||||
*
|
||||
* 7.23
|
||||
* - add FUSE_WRITEBACK_CACHE
|
||||
*/
|
||||
|
||||
#ifndef _LINUX_FUSE_H
|
||||
@ -128,7 +131,7 @@
|
||||
#define FUSE_KERNEL_VERSION 7
|
||||
|
||||
/** Minor version number of this interface */
|
||||
#define FUSE_KERNEL_MINOR_VERSION 22
|
||||
#define FUSE_KERNEL_MINOR_VERSION 23
|
||||
|
||||
/** The node ID of the root inode */
|
||||
#define FUSE_ROOT_ID 1
|
||||
@ -219,6 +222,7 @@ struct fuse_file_lock {
|
||||
* FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)
|
||||
* FUSE_READDIRPLUS_AUTO: adaptive readdirplus
|
||||
* FUSE_ASYNC_DIO: asynchronous direct I/O submission
|
||||
* FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes
|
||||
*/
|
||||
#define FUSE_ASYNC_READ (1 << 0)
|
||||
#define FUSE_POSIX_LOCKS (1 << 1)
|
||||
@ -236,6 +240,7 @@ struct fuse_file_lock {
|
||||
#define FUSE_DO_READDIRPLUS (1 << 13)
|
||||
#define FUSE_READDIRPLUS_AUTO (1 << 14)
|
||||
#define FUSE_ASYNC_DIO (1 << 15)
|
||||
#define FUSE_WRITEBACK_CACHE (1 << 16)
|
||||
|
||||
/**
|
||||
* CUSE INIT request/reply flags
|
||||
|
||||
Loading…
Reference in New Issue
Block a user