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libnvdimm/dax for 4.19-rc6
* (2) fixes for the dax error handling updates that were merged for v4.19-rc1. My mails to Al have been bouncing recently, so I do not have his ack but the uaccess change is of the trivial / obviously correct variety. The address_space_operations fixes a regression. * A filesystem-dax fix to correct the zero page lookup to be compatible with non-x86 (mips and s390) architectures. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJbqoecAAoJEB7SkWpmfYgCaPYP/1Pf2ADt0pOskSk0ixM06UI9 1lR2g2/ICMc505+oB+wUv9TkZOh9jcIS9o8GfLhgNvP7AU4woRvudeyr4NUc0mdw rtHRA6TIimbXa3+O2qMg4gqUjXRxj6urQp5oeQi8mQ/vefZv1aisEw/Klae8klVC HGoMFii19WGXXyPM2vNUb2L+JGZt1p/nl/Z8ydPavn1XkIIGb7c+MivDiaemjjgT 487TmFULgLVhTCtQXlhkH7UCcCQ3+l3yxKaS1/g2hFpWE4LncBIvq8XBPwf5RQSL H/5rH/sd30XR2L0NMERxr0ENvCJf2iIf4bIqckODN4L9ojRE8zmBZMsSeRKmHufm 3ZfTBLHjPUwwKWy7PlKSsFk2J8KjErsqRlfZQSMSJShpEgL1jCjYtuTEtupaegbU v8TwzsNDgJ1B6JuKJ7lh7hOF7vUQ/i65xG8SFACvNoiih8RGSW3llra442k2hmFu IEMXa9S4tvqHfXUb0J/6hLLi+xoV+KsYPWRiCuovy7t6EfAWUnNuGCldjfsQtZZv npHS7F7lkWlSCneDbE4cMdkkwjBKjAw0sjIWDrPVVCoITVe1j9+bEwE9reX1VOS+ L+PB/WgcVH72MeiQnmPPTcUyEmNgCbku7NEhwrMHJngxuo9HmXE+BN8jdFDYZFfL uWDV25XOxviOC9xBosw4 =mAaH -----END PGP SIGNATURE----- erge tag 'libnvdimm-fixes-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm Dan writes: "libnvdimm/dax for 4.19-rc6 * (2) fixes for the dax error handling updates that were merged for v4.19-rc1. My mails to Al have been bouncing recently, so I do not have his ack but the uaccess change is of the trivial / obviously correct variety. The address_space_operations fixes a regression. * A filesystem-dax fix to correct the zero page lookup to be compatible with non-x86 (mips and s390) architectures." * tag 'libnvdimm-fixes-4.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: device-dax: Add missing address_space_operations uaccess: Fix is_source param for check_copy_size() in copy_to_iter_mcsafe() filesystem-dax: Fix use of zero page
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commit
a38523185b
@ -535,6 +535,11 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
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return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
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}
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static const struct address_space_operations dev_dax_aops = {
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.set_page_dirty = noop_set_page_dirty,
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.invalidatepage = noop_invalidatepage,
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};
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static int dax_open(struct inode *inode, struct file *filp)
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{
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struct dax_device *dax_dev = inode_dax(inode);
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@ -544,6 +549,7 @@ static int dax_open(struct inode *inode, struct file *filp)
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dev_dbg(&dev_dax->dev, "trace\n");
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inode->i_mapping = __dax_inode->i_mapping;
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inode->i_mapping->host = __dax_inode;
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inode->i_mapping->a_ops = &dev_dax_aops;
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filp->f_mapping = inode->i_mapping;
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filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
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filp->private_data = dev_dax;
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13
fs/dax.c
13
fs/dax.c
@ -1120,21 +1120,12 @@ static vm_fault_t dax_load_hole(struct address_space *mapping, void *entry,
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{
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struct inode *inode = mapping->host;
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unsigned long vaddr = vmf->address;
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vm_fault_t ret = VM_FAULT_NOPAGE;
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struct page *zero_page;
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pfn_t pfn;
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pfn_t pfn = pfn_to_pfn_t(my_zero_pfn(vaddr));
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vm_fault_t ret;
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zero_page = ZERO_PAGE(0);
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if (unlikely(!zero_page)) {
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ret = VM_FAULT_OOM;
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goto out;
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}
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pfn = page_to_pfn_t(zero_page);
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dax_insert_mapping_entry(mapping, vmf, entry, pfn, RADIX_DAX_ZERO_PAGE,
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false);
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ret = vmf_insert_mixed(vmf->vma, vaddr, pfn);
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out:
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trace_dax_load_hole(inode, vmf, ret);
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return ret;
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}
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@ -172,7 +172,7 @@ size_t copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i)
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static __always_inline __must_check
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size_t copy_to_iter_mcsafe(void *addr, size_t bytes, struct iov_iter *i)
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{
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if (unlikely(!check_copy_size(addr, bytes, false)))
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if (unlikely(!check_copy_size(addr, bytes, true)))
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return 0;
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else
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return _copy_to_iter_mcsafe(addr, bytes, i);
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