From 313e74412105c670ff8900ec8099a3a5df1fa83c Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov Date: Thu, 28 Oct 2010 15:39:02 +0400 Subject: xen: xenfs: privcmd: check put_user() return code put_user() may fail. In this case propagate error code from privcmd_ioctl_mmap_batch(). Signed-off-by: Vasiliy Kulikov Signed-off-by: Jeremy Fitzhardinge --- drivers/xen/xenfs/privcmd.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'drivers/xen/xenfs') diff --git a/drivers/xen/xenfs/privcmd.c b/drivers/xen/xenfs/privcmd.c index f80be7f6eb95..2eb04c842511 100644 --- a/drivers/xen/xenfs/privcmd.c +++ b/drivers/xen/xenfs/privcmd.c @@ -266,9 +266,7 @@ static int mmap_return_errors(void *data, void *state) xen_pfn_t *mfnp = data; struct mmap_batch_state *st = state; - put_user(*mfnp, st->user++); - - return 0; + return put_user(*mfnp, st->user++); } static struct vm_operations_struct privcmd_vm_ops; @@ -323,10 +321,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata) up_write(&mm->mmap_sem); if (state.err > 0) { - ret = 0; - state.user = m.arr; - traverse_pages(m.num, sizeof(xen_pfn_t), + ret = traverse_pages(m.num, sizeof(xen_pfn_t), &pagelist, mmap_return_errors, &state); } -- cgit v1.2.3 From e060e7af98182494b764d002eba7fa022fe91bdf Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Thu, 11 Nov 2010 12:37:43 -0800 Subject: xen: set vma flag VM_PFNMAP in the privcmd mmap file_op Set VM_PFNMAP in the privcmd mmap file_op, rather than later in xen_remap_domain_mfn_range when it is too late because vma_wants_writenotify has already been called and vm_page_prot has already been modified. Signed-off-by: Stefano Stabellini Signed-off-by: Jeremy Fitzhardinge --- arch/x86/xen/mmu.c | 3 ++- drivers/xen/xenfs/privcmd.c | 5 +++-- 2 files changed, 5 insertions(+), 3 deletions(-) (limited to 'drivers/xen/xenfs') diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index f08ea045620f..792de4349c79 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -2299,7 +2299,8 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma, prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP); - vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; + BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_RESERVED | VM_IO)) == + (VM_PFNMAP | VM_RESERVED | VM_IO))); rmd.mfn = mfn; rmd.prot = prot; diff --git a/drivers/xen/xenfs/privcmd.c b/drivers/xen/xenfs/privcmd.c index 2eb04c842511..88474d460d82 100644 --- a/drivers/xen/xenfs/privcmd.c +++ b/drivers/xen/xenfs/privcmd.c @@ -380,8 +380,9 @@ static int privcmd_mmap(struct file *file, struct vm_area_struct *vma) if (xen_feature(XENFEAT_auto_translated_physmap)) return -ENOSYS; - /* DONTCOPY is essential for Xen as copy_page_range is broken. */ - vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY; + /* DONTCOPY is essential for Xen because copy_page_range doesn't know + * how to recreate these mappings */ + vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY | VM_PFNMAP; vma->vm_ops = &privcmd_vm_ops; vma->vm_private_data = NULL; -- cgit v1.2.3 From fe61f1d737f7804e0bd440ace9724e669e2c2906 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 16 Nov 2010 11:06:46 -0800 Subject: xen/xenfs: update xenfs_mount for new prototype .mount now returns a struct dentry *. Signed-off-by: Jeremy Fitzhardinge --- drivers/xen/xenfs/super.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/xen/xenfs') diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c index f6339d11d59c..990ee42167a1 100644 --- a/drivers/xen/xenfs/super.c +++ b/drivers/xen/xenfs/super.c @@ -121,9 +121,9 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent) return rc; } -static int xenfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, - void *data) +static struct dentry *xenfs_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data) { return mount_single(fs_type, flags, data, xenfs_fill_super); } -- cgit v1.2.3 From 9045d47ea362e6a3727ee3f1b69a1b656976772e Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Thu, 18 Nov 2010 17:14:46 -0800 Subject: Revert "xen/privcmd: create address space to allow writable mmaps" This reverts commit 24a89b5be4cf2b7f1b49b56b6cb4a7b71fccf241. We should no longer need an address space now that we're correctly setting VM_PFNMAP on our vmas. Conflicts: drivers/xen/xenfs/super.c Signed-off-by: Jeremy Fitzhardinge --- drivers/xen/xenfs/super.c | 40 ++++------------------------------------ 1 file changed, 4 insertions(+), 36 deletions(-) (limited to 'drivers/xen/xenfs') diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c index 990ee42167a1..1aa389719846 100644 --- a/drivers/xen/xenfs/super.c +++ b/drivers/xen/xenfs/super.c @@ -12,8 +12,6 @@ #include #include #include -#include -#include #include @@ -24,28 +22,12 @@ MODULE_DESCRIPTION("Xen filesystem"); MODULE_LICENSE("GPL"); -static int xenfs_set_page_dirty(struct page *page) -{ - return !TestSetPageDirty(page); -} - -static const struct address_space_operations xenfs_aops = { - .set_page_dirty = xenfs_set_page_dirty, -}; - -static struct backing_dev_info xenfs_backing_dev_info = { - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, -}; - static struct inode *xenfs_make_inode(struct super_block *sb, int mode) { struct inode *ret = new_inode(sb); if (ret) { ret->i_mode = mode; - ret->i_mapping->a_ops = &xenfs_aops; - ret->i_mapping->backing_dev_info = &xenfs_backing_dev_info; ret->i_uid = ret->i_gid = 0; ret->i_blocks = 0; ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; @@ -137,25 +119,11 @@ static struct file_system_type xenfs_type = { static int __init xenfs_init(void) { - int err; - if (!xen_domain()) { - printk(KERN_INFO "xenfs: not registering filesystem on non-xen platform\n"); - return 0; - } - - err = register_filesystem(&xenfs_type); - if (err) { - printk(KERN_ERR "xenfs: Unable to register filesystem!\n"); - goto out; - } - - err = bdi_init(&xenfs_backing_dev_info); - if (err) - unregister_filesystem(&xenfs_type); - - out: + if (xen_domain()) + return register_filesystem(&xenfs_type); - return err; + printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n"); + return 0; } static void __exit xenfs_exit(void) -- cgit v1.2.3