aboutsummaryrefslogtreecommitdiff
path: root/fs/hugetlbfs/inode.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/hugetlbfs/inode.c')
-rw-r--r--fs/hugetlbfs/inode.c316
1 files changed, 196 insertions, 120 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 0aa424a0234..1e2872b2534 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1,11 +1,13 @@
/*
* hugetlbpage-backed filesystem. Based on ramfs.
*
- * William Irwin, 2002
+ * Nadia Yvette Chambers, 2002
*
* Copyright (C) 2002 Linus Torvalds.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/thread_info.h>
#include <asm/current.h>
@@ -41,6 +43,25 @@ const struct file_operations hugetlbfs_file_operations;
static const struct inode_operations hugetlbfs_dir_inode_operations;
static const struct inode_operations hugetlbfs_inode_operations;
+struct hugetlbfs_config {
+ kuid_t uid;
+ kgid_t gid;
+ umode_t mode;
+ long nr_blocks;
+ long nr_inodes;
+ struct hstate *hstate;
+};
+
+struct hugetlbfs_inode_info {
+ struct shared_policy policy;
+ struct inode vfs_inode;
+};
+
+static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
+{
+ return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
+}
+
static struct backing_dev_info hugetlbfs_backing_dev_info = {
.name = "hugetlbfs",
.ra_pages = 0, /* No readahead */
@@ -78,7 +99,7 @@ static void huge_pagevec_release(struct pagevec *pvec)
static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
- struct inode *inode = file->f_path.dentry->d_inode;
+ struct inode *inode = file_inode(file);
loff_t len, vma_len;
int ret;
struct hstate *h = hstate_file(file);
@@ -91,7 +112,7 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
* way when do_mmap_pgoff unwinds (may be important on powerpc
* and ia64).
*/
- vma->vm_flags |= VM_HUGETLB | VM_RESERVED;
+ vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND;
vma->vm_ops = &hugetlb_vm_ops;
if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT))
@@ -132,8 +153,8 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
- unsigned long start_addr;
struct hstate *h = hstate_file(file);
+ struct vm_unmapped_area_info info;
if (len & ~huge_page_mask(h))
return -EINVAL;
@@ -154,32 +175,13 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
return addr;
}
- start_addr = mm->free_area_cache;
-
- if (len <= mm->cached_hole_size)
- start_addr = TASK_UNMAPPED_BASE;
-
-full_search:
- addr = ALIGN(start_addr, huge_page_size(h));
-
- for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
- /* At this point: (!vma || addr < vma->vm_end). */
- if (TASK_SIZE - len < addr) {
- /*
- * Start a new search - just in case we missed
- * some holes.
- */
- if (start_addr != TASK_UNMAPPED_BASE) {
- start_addr = TASK_UNMAPPED_BASE;
- goto full_search;
- }
- return -ENOMEM;
- }
-
- if (!vma || addr + len <= vma->vm_start)
- return addr;
- addr = ALIGN(vma->vm_end, huge_page_size(h));
- }
+ info.flags = 0;
+ info.length = len;
+ info.low_limit = TASK_UNMAPPED_BASE;
+ info.high_limit = TASK_SIZE;
+ info.align_mask = PAGE_MASK & ~huge_page_mask(h);
+ info.align_offset = 0;
+ return vm_unmapped_area(&info);
}
#endif
@@ -366,22 +368,27 @@ static void truncate_hugepages(struct inode *inode, loff_t lstart)
static void hugetlbfs_evict_inode(struct inode *inode)
{
+ struct resv_map *resv_map;
+
truncate_hugepages(inode, 0);
- end_writeback(inode);
+ resv_map = (struct resv_map *)inode->i_mapping->private_data;
+ /* root inode doesn't have the resv_map, so we should check it */
+ if (resv_map)
+ resv_map_release(&resv_map->refs);
+ clear_inode(inode);
}
static inline void
-hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff)
+hugetlb_vmtruncate_list(struct rb_root *root, pgoff_t pgoff)
{
struct vm_area_struct *vma;
- struct prio_tree_iter iter;
- vma_prio_tree_foreach(vma, &iter, root, pgoff, ULONG_MAX) {
+ vma_interval_tree_foreach(vma, root, pgoff, ULONG_MAX) {
unsigned long v_offset;
/*
* Can the expression below overflow on 32-bit arches?
- * No, because the prio_tree returns us only those vmas
+ * No, because the interval tree returns us only those vmas
* which overlap the truncated area starting at pgoff,
* and no vma on a 32-bit arch can span beyond the 4GB.
*/
@@ -390,8 +397,8 @@ hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff)
else
v_offset = 0;
- __unmap_hugepage_range(vma,
- vma->vm_start + v_offset, vma->vm_end, NULL);
+ unmap_hugepage_range(vma, vma->vm_start + v_offset,
+ vma->vm_end, NULL);
}
}
@@ -406,7 +413,7 @@ static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
i_size_write(inode, offset);
mutex_lock(&mapping->i_mmap_mutex);
- if (!prio_tree_empty(&mapping->i_mmap))
+ if (!RB_EMPTY_ROOT(&mapping->i_mmap))
hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
mutex_unlock(&mapping->i_mmap_mutex);
truncate_hugepages(inode, offset);
@@ -440,22 +447,60 @@ static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
return 0;
}
-static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
- gid_t gid, int mode, dev_t dev)
+static struct inode *hugetlbfs_get_root(struct super_block *sb,
+ struct hugetlbfs_config *config)
+{
+ struct inode *inode;
+
+ inode = new_inode(sb);
+ if (inode) {
+ struct hugetlbfs_inode_info *info;
+ inode->i_ino = get_next_ino();
+ inode->i_mode = S_IFDIR | config->mode;
+ inode->i_uid = config->uid;
+ inode->i_gid = config->gid;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ info = HUGETLBFS_I(inode);
+ mpol_shared_policy_init(&info->policy, NULL);
+ inode->i_op = &hugetlbfs_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ /* directory inodes start off with i_nlink == 2 (for "." entry) */
+ inc_nlink(inode);
+ lockdep_annotate_inode_mutex_key(inode);
+ }
+ return inode;
+}
+
+/*
+ * Hugetlbfs is not reclaimable; therefore its i_mmap_mutex will never
+ * be taken from reclaim -- unlike regular filesystems. This needs an
+ * annotation because huge_pmd_share() does an allocation under
+ * i_mmap_mutex.
+ */
+static struct lock_class_key hugetlbfs_i_mmap_mutex_key;
+
+static struct inode *hugetlbfs_get_inode(struct super_block *sb,
+ struct inode *dir,
+ umode_t mode, dev_t dev)
{
struct inode *inode;
+ struct resv_map *resv_map;
+
+ resv_map = resv_map_alloc();
+ if (!resv_map)
+ return NULL;
inode = new_inode(sb);
if (inode) {
struct hugetlbfs_inode_info *info;
inode->i_ino = get_next_ino();
- inode->i_mode = mode;
- inode->i_uid = uid;
- inode->i_gid = gid;
+ inode_init_owner(inode, dir, mode);
+ lockdep_set_class(&inode->i_mapping->i_mmap_mutex,
+ &hugetlbfs_i_mmap_mutex_key);
inode->i_mapping->a_ops = &hugetlbfs_aops;
inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- INIT_LIST_HEAD(&inode->i_mapping->private_list);
+ inode->i_mapping->private_data = resv_map;
info = HUGETLBFS_I(inode);
/*
* The policy is initialized here even if we are creating a
@@ -485,7 +530,9 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
break;
}
lockdep_annotate_inode_mutex_key(inode);
- }
+ } else
+ kref_put(&resv_map->refs, resv_map_release);
+
return inode;
}
@@ -493,20 +540,12 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
* File creation. Allocate an inode, and we're done..
*/
static int hugetlbfs_mknod(struct inode *dir,
- struct dentry *dentry, int mode, dev_t dev)
+ struct dentry *dentry, umode_t mode, dev_t dev)
{
struct inode *inode;
int error = -ENOSPC;
- gid_t gid;
-
- if (dir->i_mode & S_ISGID) {
- gid = dir->i_gid;
- if (S_ISDIR(mode))
- mode |= S_ISGID;
- } else {
- gid = current_fsgid();
- }
- inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(), gid, mode, dev);
+
+ inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev);
if (inode) {
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
d_instantiate(dentry, inode);
@@ -516,7 +555,7 @@ static int hugetlbfs_mknod(struct inode *dir,
return error;
}
-static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0);
if (!retval)
@@ -524,7 +563,7 @@ static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
return retval;
}
-static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
+static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
{
return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0);
}
@@ -534,15 +573,8 @@ static int hugetlbfs_symlink(struct inode *dir,
{
struct inode *inode;
int error = -ENOSPC;
- gid_t gid;
- if (dir->i_mode & S_ISGID)
- gid = dir->i_gid;
- else
- gid = current_fsgid();
-
- inode = hugetlbfs_get_inode(dir->i_sb, current_fsuid(),
- gid, S_IFLNK|S_IRWXUGO, 0);
+ inode = hugetlbfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0);
if (inode) {
int l = strlen(symname)+1;
error = page_symlink(inode, symname, l);
@@ -575,11 +607,11 @@ static int hugetlbfs_migrate_page(struct address_space *mapping,
int rc;
rc = migrate_huge_page_move_mapping(mapping, newpage, page);
- if (rc)
+ if (rc != MIGRATEPAGE_SUCCESS)
return rc;
migrate_page_copy(newpage, page);
- return 0;
+ return MIGRATEPAGE_SUCCESS;
}
static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
@@ -670,7 +702,6 @@ static struct inode *hugetlbfs_alloc_inode(struct super_block *sb)
static void hugetlbfs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
- INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
}
@@ -752,13 +783,17 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
case Opt_uid:
if (match_int(&args[0], &option))
goto bad_val;
- pconfig->uid = option;
+ pconfig->uid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(pconfig->uid))
+ goto bad_val;
break;
case Opt_gid:
if (match_int(&args[0], &option))
goto bad_val;
- pconfig->gid = option;
+ pconfig->gid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(pconfig->gid))
+ goto bad_val;
break;
case Opt_mode:
@@ -790,8 +825,7 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
ps = memparse(args[0].from, &rest);
pconfig->hstate = size_to_hstate(ps);
if (!pconfig->hstate) {
- printk(KERN_ERR
- "hugetlbfs: Unsupported page size %lu MB\n",
+ pr_err("Unsupported page size %lu MB\n",
ps >> 20);
return -EINVAL;
}
@@ -799,8 +833,7 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
}
default:
- printk(KERN_ERR "hugetlbfs: Bad mount option: \"%s\"\n",
- p);
+ pr_err("Bad mount option: \"%s\"\n", p);
return -EINVAL;
break;
}
@@ -820,16 +853,13 @@ hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
return 0;
bad_val:
- printk(KERN_ERR "hugetlbfs: Bad value '%s' for mount option '%s'\n",
- args[0].from, p);
+ pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p);
return -EINVAL;
}
static int
hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
{
- struct inode * inode;
- struct dentry * root;
int ret;
struct hugetlbfs_config config;
struct hugetlbfs_sb_info *sbinfo;
@@ -866,21 +896,12 @@ hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_magic = HUGETLBFS_MAGIC;
sb->s_op = &hugetlbfs_ops;
sb->s_time_gran = 1;
- inode = hugetlbfs_get_inode(sb, config.uid, config.gid,
- S_IFDIR | config.mode, 0);
- if (!inode)
- goto out_free;
-
- root = d_alloc_root(inode);
- if (!root) {
- iput(inode);
+ sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config));
+ if (!sb->s_root)
goto out_free;
- }
- sb->s_root = root;
return 0;
out_free:
- if (sbinfo->spool)
- kfree(sbinfo->spool);
+ kfree(sbinfo->spool);
kfree(sbinfo);
return -ENOMEM;
}
@@ -896,55 +917,82 @@ static struct file_system_type hugetlbfs_fs_type = {
.mount = hugetlbfs_mount,
.kill_sb = kill_litter_super,
};
+MODULE_ALIAS_FS("hugetlbfs");
-static struct vfsmount *hugetlbfs_vfsmount;
+static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE];
static int can_do_hugetlb_shm(void)
{
- return capable(CAP_IPC_LOCK) || in_group_p(sysctl_hugetlb_shm_group);
+ kgid_t shm_group;
+ shm_group = make_kgid(&init_user_ns, sysctl_hugetlb_shm_group);
+ return capable(CAP_IPC_LOCK) || in_group_p(shm_group);
+}
+
+static int get_hstate_idx(int page_size_log)
+{
+ struct hstate *h = hstate_sizelog(page_size_log);
+
+ if (!h)
+ return -1;
+ return h - hstates;
}
+static const struct dentry_operations anon_ops = {
+ .d_dname = simple_dname
+};
+
+/*
+ * Note that size should be aligned to proper hugepage size in caller side,
+ * otherwise hugetlb_reserve_pages reserves one less hugepages than intended.
+ */
struct file *hugetlb_file_setup(const char *name, size_t size,
- vm_flags_t acctflag,
- struct user_struct **user, int creat_flags)
+ vm_flags_t acctflag, struct user_struct **user,
+ int creat_flags, int page_size_log)
{
- int error = -ENOMEM;
- struct file *file;
+ struct file *file = ERR_PTR(-ENOMEM);
struct inode *inode;
struct path path;
- struct dentry *root;
+ struct super_block *sb;
struct qstr quick_string;
+ int hstate_idx;
+
+ hstate_idx = get_hstate_idx(page_size_log);
+ if (hstate_idx < 0)
+ return ERR_PTR(-ENODEV);
*user = NULL;
- if (!hugetlbfs_vfsmount)
+ if (!hugetlbfs_vfsmount[hstate_idx])
return ERR_PTR(-ENOENT);
if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) {
*user = current_user();
if (user_shm_lock(size, *user)) {
- printk_once(KERN_WARNING "Using mlock ulimits for SHM_HUGETLB is deprecated\n");
+ task_lock(current);
+ pr_warn_once("%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n",
+ current->comm, current->pid);
+ task_unlock(current);
} else {
*user = NULL;
return ERR_PTR(-EPERM);
}
}
- root = hugetlbfs_vfsmount->mnt_root;
+ sb = hugetlbfs_vfsmount[hstate_idx]->mnt_sb;
quick_string.name = name;
quick_string.len = strlen(quick_string.name);
quick_string.hash = 0;
- path.dentry = d_alloc(root, &quick_string);
+ path.dentry = d_alloc_pseudo(sb, &quick_string);
if (!path.dentry)
goto out_shm_unlock;
- path.mnt = mntget(hugetlbfs_vfsmount);
- error = -ENOSPC;
- inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(),
- current_fsgid(), S_IFREG | S_IRWXUGO, 0);
+ d_set_d_op(path.dentry, &anon_ops);
+ path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]);
+ file = ERR_PTR(-ENOSPC);
+ inode = hugetlbfs_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0);
if (!inode)
goto out_dentry;
- error = -ENOMEM;
+ file = ERR_PTR(-ENOMEM);
if (hugetlb_reserve_pages(inode, 0,
size >> huge_page_shift(hstate_inode(inode)), NULL,
acctflag))
@@ -954,10 +1002,9 @@ struct file *hugetlb_file_setup(const char *name, size_t size,
inode->i_size = size;
clear_nlink(inode);
- error = -ENFILE;
file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&hugetlbfs_file_operations);
- if (!file)
+ if (IS_ERR(file))
goto out_dentry; /* inode is already attached */
return file;
@@ -971,18 +1018,25 @@ out_shm_unlock:
user_shm_unlock(size, *user);
*user = NULL;
}
- return ERR_PTR(error);
+ return file;
}
static int __init init_hugetlbfs_fs(void)
{
+ struct hstate *h;
int error;
- struct vfsmount *vfsmount;
+ int i;
+
+ if (!hugepages_supported()) {
+ pr_info("disabling because there are no supported hugepage sizes\n");
+ return -ENOTSUPP;
+ }
error = bdi_init(&hugetlbfs_backing_dev_info);
if (error)
return error;
+ error = -ENOMEM;
hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
sizeof(struct hugetlbfs_inode_info),
0, 0, init_once);
@@ -993,18 +1047,29 @@ static int __init init_hugetlbfs_fs(void)
if (error)
goto out;
- vfsmount = kern_mount(&hugetlbfs_fs_type);
+ i = 0;
+ for_each_hstate(h) {
+ char buf[50];
+ unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10);
- if (!IS_ERR(vfsmount)) {
- hugetlbfs_vfsmount = vfsmount;
- return 0;
- }
+ snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb);
+ hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type,
+ buf);
- error = PTR_ERR(vfsmount);
+ if (IS_ERR(hugetlbfs_vfsmount[i])) {
+ pr_err("Cannot mount internal hugetlbfs for "
+ "page size %uK", ps_kb);
+ error = PTR_ERR(hugetlbfs_vfsmount[i]);
+ hugetlbfs_vfsmount[i] = NULL;
+ }
+ i++;
+ }
+ /* Non default hstates are optional */
+ if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx]))
+ return 0;
out:
- if (error)
- kmem_cache_destroy(hugetlbfs_inode_cachep);
+ kmem_cache_destroy(hugetlbfs_inode_cachep);
out2:
bdi_destroy(&hugetlbfs_backing_dev_info);
return error;
@@ -1012,8 +1077,19 @@ static int __init init_hugetlbfs_fs(void)
static void __exit exit_hugetlbfs_fs(void)
{
+ struct hstate *h;
+ int i;
+
+
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
kmem_cache_destroy(hugetlbfs_inode_cachep);
- kern_unmount(hugetlbfs_vfsmount);
+ i = 0;
+ for_each_hstate(h)
+ kern_unmount(hugetlbfs_vfsmount[i++]);
unregister_filesystem(&hugetlbfs_fs_type);
bdi_destroy(&hugetlbfs_backing_dev_info);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-14 05:44:39 +0000