We are planning to use our own tmpfs mnt in i915 in place of the shm_mnt such that we can control the mount options, in particular huge=, which we require to support huge-gtt-pages. So rather than roll our own version of __shmem_file_setup, it would be preferred if we could just give shmem our mnt, and let it do the rest.
Based on the patch: https://patchwork.freedesktop.org/patch/178433/ Suggested-by: Chris Wilson <ch...@chris-wilson.co.uk> Signed-off-by: Matthew Auld <matthew.a...@intel.com> Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com> Cc: Chris Wilson <ch...@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vet...@intel.com> Cc: Dave Hansen <dave.han...@intel.com> Cc: Kirill A. Shutemov <kir...@shutemov.name> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Hugh Dickins <hu...@google.com> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Cc: "Arve Hjønnevåg" <a...@android.com> Cc: Riley Andrews <riandr...@android.com> Cc: dri-de...@lists.freedesktop.org Cc: linux...@kvack.org Cc: de...@driverdev.osuosl.org --- drivers/gpu/drm/drm_gem.c | 2 +- drivers/gpu/drm/ttm/ttm_tt.c | 2 +- drivers/staging/android/ashmem.c | 3 ++- include/linux/shmem_fs.h | 4 +++- mm/shmem.c | 24 ++++++++++++++---------- 5 files changed, 21 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 7199bba68c37..12e5fdc90a6f 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -138,7 +138,7 @@ int drm_gem_object_init(struct drm_device *dev, drm_gem_private_object_init(dev, obj, size); - filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); + filp = shmem_file_setup(TMPFS_MNT, "drm mm object", size, VM_NORESERVE); if (IS_ERR(filp)) return PTR_ERR(filp); diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 8ebc8d3560c3..4eef07d8b8ed 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -336,7 +336,7 @@ int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage) BUG_ON(ttm->caching_state != tt_cached); if (!persistent_swap_storage) { - swap_storage = shmem_file_setup("ttm swap", + swap_storage = shmem_file_setup(TMPFS_MNT, "ttm swap", ttm->num_pages << PAGE_SHIFT, 0); if (IS_ERR(swap_storage)) { diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c index 0f695df14c9d..184fcbb6d127 100644 --- a/drivers/staging/android/ashmem.c +++ b/drivers/staging/android/ashmem.c @@ -391,7 +391,8 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma) name = asma->name; /* ... and allocate the backing shmem file */ - vmfile = shmem_file_setup(name, asma->size, vma->vm_flags); + vmfile = shmem_file_setup(TMPFS_MNT, name, asma->size, + vma->vm_flags); if (IS_ERR(vmfile)) { ret = PTR_ERR(vmfile); goto out; diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index b6c3540e07bc..00b199d804ca 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -44,12 +44,14 @@ static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) return container_of(inode, struct shmem_inode_info, vfs_inode); } +#define TMPFS_MNT NULL + /* * Functions in mm/shmem.c called directly from elsewhere: */ extern int shmem_init(void); extern int shmem_fill_super(struct super_block *sb, void *data, int silent); -extern struct file *shmem_file_setup(const char *name, +extern struct file *shmem_file_setup(struct vfsmount *mnt, const char *name, loff_t size, unsigned long flags); extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned long flags); diff --git a/mm/shmem.c b/mm/shmem.c index 07a1d22807be..ae2e46291ffa 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -3715,7 +3715,7 @@ SYSCALL_DEFINE2(memfd_create, (flags >> MFD_HUGE_SHIFT) & MFD_HUGE_MASK); } else - file = shmem_file_setup(name, 0, VM_NORESERVE); + file = shmem_file_setup(TMPFS_MNT, name, 0, VM_NORESERVE); if (IS_ERR(file)) { error = PTR_ERR(file); goto err_fd; @@ -4183,7 +4183,7 @@ static const struct dentry_operations anon_ops = { .d_dname = simple_dname }; -static struct file *__shmem_file_setup(const char *name, loff_t size, +static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, loff_t size, unsigned long flags, unsigned int i_flags) { struct file *res; @@ -4192,8 +4192,11 @@ static struct file *__shmem_file_setup(const char *name, loff_t size, struct super_block *sb; struct qstr this; - if (IS_ERR(shm_mnt)) - return ERR_CAST(shm_mnt); + if (mnt == TMPFS_MNT) + mnt = shm_mnt; + + if (IS_ERR(mnt)) + return ERR_CAST(mnt); if (size < 0 || size > MAX_LFS_FILESIZE) return ERR_PTR(-EINVAL); @@ -4205,8 +4208,8 @@ static struct file *__shmem_file_setup(const char *name, loff_t size, this.name = name; this.len = strlen(name); this.hash = 0; /* will go */ - sb = shm_mnt->mnt_sb; - path.mnt = mntget(shm_mnt); + sb = mnt->mnt_sb; + path.mnt = mntget(mnt); path.dentry = d_alloc_pseudo(sb, &this); if (!path.dentry) goto put_memory; @@ -4251,18 +4254,19 @@ static struct file *__shmem_file_setup(const char *name, loff_t size, */ struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned long flags) { - return __shmem_file_setup(name, size, flags, S_PRIVATE); + return __shmem_file_setup(TMPFS_MNT, name, size, flags, S_PRIVATE); } /** * shmem_file_setup - get an unlinked file living in tmpfs + * @mnt: the tmpfs mount where the file will be created * @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ -struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags) +struct file *shmem_file_setup(struct vfsmount *mnt, const char *name, loff_t size, unsigned long flags) { - return __shmem_file_setup(name, size, flags, 0); + return __shmem_file_setup(mnt, name, size, flags, 0); } EXPORT_SYMBOL_GPL(shmem_file_setup); @@ -4281,7 +4285,7 @@ int shmem_zero_setup(struct vm_area_struct *vma) * accessible to the user through its mapping, use S_PRIVATE flag to * bypass file security, in the same way as shmem_kernel_file_setup(). */ - file = __shmem_file_setup("dev/zero", size, vma->vm_flags, S_PRIVATE); + file = shmem_kernel_file_setup("dev/zero", size, vma->vm_flags); if (IS_ERR(file)) return PTR_ERR(file); -- 2.13.5 _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
