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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=yJojWOMRYYMA:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=V8PVCHvh7cpLA54rH4kA:9 cc=ntf awl=host:13614 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTA4MDE2NSBTYWx0ZWRfX1r+yBw/PKBbE JuzNuRhiahSbCxapF6nIwYRcrkXrGSIdRS2sSsm6WRAa7/L2KrYgH6mfVgDlE0MWCi2YBtc6gMg BUfqzLtXYfi0tZqTlwhOeY/cHVuHMunezOPBMVkpB26PKVRz9C3KYLCUk+UHJr5hJ22pBVNBI9x X9FYTdDe08lEm/XaHJnxz8rlBQJt2uREWTkCqAfLhbuPkXbH+AsZfEL1swY0EJYOnp58oEb6GXl Xs6MeZ22kITolBXA8goNM85jkAjfuZw5/loSJcLjCiDH3Az4Yr0FtkIr5ccNATP9xCeHmft7ScQ 0RDReZHdy7QRcMLgewFYAPuF3P8LsIOrym5T9RBPnJBDqulQ0FPk6PorV3CppYtScA/GD1X+Z6O 7wPXqzd7WYgRrjs9NhoHVALUqqQhTg== X-Proofpoint-GUID: 9zhFaUdicrhfnM6rPj9dikALdF6Jz3Wl X-Proofpoint-ORIG-GUID: 9zhFaUdicrhfnM6rPj9dikALdF6Jz3Wl Content-Type: text/plain; charset="utf-8" It's useful to be able to determine the size of a VMA descriptor range used on f_op->mmap_prepare, expressed both in bytes and pages, so add helpers for both and update code that could make use of it to do so. Signed-off-by: Lorenzo Stoakes Acked-by: David Hildenbrand Reviewed-by: Jan Kara --- fs/ntfs3/file.c | 2 +- include/linux/mm.h | 10 ++++++++++ mm/secretmem.c | 2 +- 3 files changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c index c1ece707b195..86eb88f62714 100644 --- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -304,7 +304,7 @@ static int ntfs_file_mmap_prepare(struct vm_area_desc *= desc) =20 if (rw) { u64 to =3D min_t(loff_t, i_size_read(inode), - from + desc->end - desc->start); + from + vma_desc_size(desc)); =20 if (is_sparsed(ni)) { /* Allocate clusters for rw map. */ diff --git a/include/linux/mm.h b/include/linux/mm.h index 892fe5dbf9de..0b97589aec6d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3572,6 +3572,16 @@ static inline unsigned long vma_pages(const struct v= m_area_struct *vma) return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; } =20 +static inline unsigned long vma_desc_size(struct vm_area_desc *desc) +{ + return desc->end - desc->start; +} + +static inline unsigned long vma_desc_pages(struct vm_area_desc *desc) +{ + return vma_desc_size(desc) >> PAGE_SHIFT; +} + /* Look up the first VMA which exactly match the interval vm_start ... vm_= end */ static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, unsigned long vm_start, unsigned long vm_end) diff --git a/mm/secretmem.c b/mm/secretmem.c index 60137305bc20..62066ddb1e9c 100644 --- a/mm/secretmem.c +++ b/mm/secretmem.c @@ -120,7 +120,7 @@ static int secretmem_release(struct inode *inode, struc= t file *file) =20 static int secretmem_mmap_prepare(struct vm_area_desc *desc) { - const unsigned long len =3D desc->end - desc->start; + const unsigned long len =3D vma_desc_size(desc); =20 if ((desc->vm_flags & (VM_SHARED | VM_MAYSHARE)) =3D=3D 0) return -EINVAL; --=20 2.51.0