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-rw-r--r--fs/hugetlbfs/inode.c96
1 files changed, 26 insertions, 70 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index b3519528994..3a5b4e92345 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -35,7 +35,7 @@
static struct super_operations hugetlbfs_ops;
static struct address_space_operations hugetlbfs_aops;
-struct file_operations hugetlbfs_file_operations;
+const struct file_operations hugetlbfs_file_operations;
static struct inode_operations hugetlbfs_dir_inode_operations;
static struct inode_operations hugetlbfs_inode_operations;
@@ -56,48 +56,10 @@ static void huge_pagevec_release(struct pagevec *pvec)
pagevec_reinit(pvec);
}
-/*
- * huge_pages_needed tries to determine the number of new huge pages that
- * will be required to fully populate this VMA. This will be equal to
- * the size of the VMA in huge pages minus the number of huge pages
- * (covered by this VMA) that are found in the page cache.
- *
- * Result is in bytes to be compatible with is_hugepage_mem_enough()
- */
-static unsigned long
-huge_pages_needed(struct address_space *mapping, struct vm_area_struct *vma)
-{
- int i;
- struct pagevec pvec;
- unsigned long start = vma->vm_start;
- unsigned long end = vma->vm_end;
- unsigned long hugepages = (end - start) >> HPAGE_SHIFT;
- pgoff_t next = vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT);
- pgoff_t endpg = next + hugepages;
-
- pagevec_init(&pvec, 0);
- while (next < endpg) {
- if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE))
- break;
- for (i = 0; i < pagevec_count(&pvec); i++) {
- struct page *page = pvec.pages[i];
- if (page->index > next)
- next = page->index;
- if (page->index >= endpg)
- break;
- next++;
- hugepages--;
- }
- huge_pagevec_release(&pvec);
- }
- return hugepages << HPAGE_SHIFT;
-}
-
static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
struct inode *inode = file->f_dentry->d_inode;
- struct address_space *mapping = inode->i_mapping;
- unsigned long bytes;
+ struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode);
loff_t len, vma_len;
int ret;
@@ -113,10 +75,6 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
if (vma->vm_end - vma->vm_start < HPAGE_SIZE)
return -EINVAL;
- bytes = huge_pages_needed(mapping, vma);
- if (!is_hugepage_mem_enough(bytes))
- return -ENOMEM;
-
vma_len = (loff_t)(vma->vm_end - vma->vm_start);
mutex_lock(&inode->i_mutex);
@@ -129,6 +87,10 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
if (!(vma->vm_flags & VM_WRITE) && len > inode->i_size)
goto out;
+ if (vma->vm_flags & VM_MAYSHARE)
+ if (hugetlb_extend_reservation(info, len >> HPAGE_SHIFT) != 0)
+ goto out;
+
ret = 0;
hugetlb_prefault_arch_hook(vma->vm_mm);
if (inode->i_size < len)
@@ -227,13 +189,18 @@ static void truncate_huge_page(struct page *page)
put_page(page);
}
-static void truncate_hugepages(struct address_space *mapping, loff_t lstart)
+static void truncate_hugepages(struct inode *inode, loff_t lstart)
{
+ struct address_space *mapping = &inode->i_data;
const pgoff_t start = lstart >> HPAGE_SHIFT;
struct pagevec pvec;
pgoff_t next;
int i;
+ hugetlb_truncate_reservation(HUGETLBFS_I(inode),
+ lstart >> HPAGE_SHIFT);
+ if (!mapping->nrpages)
+ return;
pagevec_init(&pvec, 0);
next = start;
while (1) {
@@ -262,8 +229,7 @@ static void truncate_hugepages(struct address_space *mapping, loff_t lstart)
static void hugetlbfs_delete_inode(struct inode *inode)
{
- if (inode->i_data.nrpages)
- truncate_hugepages(&inode->i_data, 0);
+ truncate_hugepages(inode, 0);
clear_inode(inode);
}
@@ -296,8 +262,7 @@ static void hugetlbfs_forget_inode(struct inode *inode)
inode->i_state |= I_FREEING;
inodes_stat.nr_inodes--;
spin_unlock(&inode_lock);
- if (inode->i_data.nrpages)
- truncate_hugepages(&inode->i_data, 0);
+ truncate_hugepages(inode, 0);
clear_inode(inode);
destroy_inode(inode);
}
@@ -356,7 +321,7 @@ static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
if (!prio_tree_empty(&mapping->i_mmap))
hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
spin_unlock(&mapping->i_mmap_lock);
- truncate_hugepages(mapping, offset);
+ truncate_hugepages(inode, offset);
return 0;
}
@@ -573,6 +538,7 @@ static struct inode *hugetlbfs_alloc_inode(struct super_block *sb)
hugetlbfs_inc_free_inodes(sbinfo);
return NULL;
}
+ p->prereserved_hpages = 0;
return &p->vfs_inode;
}
@@ -600,7 +566,7 @@ static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
inode_init_once(&ei->vfs_inode);
}
-struct file_operations hugetlbfs_file_operations = {
+const struct file_operations hugetlbfs_file_operations = {
.mmap = hugetlbfs_file_mmap,
.fsync = simple_sync_file,
.get_unmapped_area = hugetlb_get_unmapped_area,
@@ -771,21 +737,6 @@ static struct file_system_type hugetlbfs_fs_type = {
static struct vfsmount *hugetlbfs_vfsmount;
-/*
- * Return the next identifier for a shm file
- */
-static unsigned long hugetlbfs_counter(void)
-{
- static DEFINE_SPINLOCK(lock);
- static unsigned long counter;
- unsigned long ret;
-
- spin_lock(&lock);
- ret = ++counter;
- spin_unlock(&lock);
- return ret;
-}
-
static int can_do_hugetlb_shm(void)
{
return likely(capable(CAP_IPC_LOCK) ||
@@ -801,18 +752,16 @@ struct file *hugetlb_zero_setup(size_t size)
struct dentry *dentry, *root;
struct qstr quick_string;
char buf[16];
+ static atomic_t counter;
if (!can_do_hugetlb_shm())
return ERR_PTR(-EPERM);
- if (!is_hugepage_mem_enough(size))
- return ERR_PTR(-ENOMEM);
-
if (!user_shm_lock(size, current->user))
return ERR_PTR(-ENOMEM);
root = hugetlbfs_vfsmount->mnt_root;
- snprintf(buf, 16, "%lu", hugetlbfs_counter());
+ snprintf(buf, 16, "%u", atomic_inc_return(&counter));
quick_string.name = buf;
quick_string.len = strlen(quick_string.name);
quick_string.hash = 0;
@@ -831,6 +780,11 @@ struct file *hugetlb_zero_setup(size_t size)
if (!inode)
goto out_file;
+ error = -ENOMEM;
+ if (hugetlb_extend_reservation(HUGETLBFS_I(inode),
+ size >> HPAGE_SHIFT) != 0)
+ goto out_inode;
+
d_instantiate(dentry, inode);
inode->i_size = size;
inode->i_nlink = 0;
@@ -841,6 +795,8 @@ struct file *hugetlb_zero_setup(size_t size)
file->f_mode = FMODE_WRITE | FMODE_READ;
return file;
+out_inode:
+ iput(inode);
out_file:
put_filp(file);
out_dentry:
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-26 08:32:11 +0000