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-rw-r--r--mm/shmem.c4376
1 files changed, 4376 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
new file mode 100644
index 000000000..f7c08e169
--- /dev/null
+++ b/mm/shmem.c
@@ -0,0 +1,4376 @@
+/*
+ * Resizable virtual memory filesystem for Linux.
+ *
+ * Copyright (C) 2000 Linus Torvalds.
+ * 2000 Transmeta Corp.
+ * 2000-2001 Christoph Rohland
+ * 2000-2001 SAP AG
+ * 2002 Red Hat Inc.
+ * Copyright (C) 2002-2011 Hugh Dickins.
+ * Copyright (C) 2011 Google Inc.
+ * Copyright (C) 2002-2005 VERITAS Software Corporation.
+ * Copyright (C) 2004 Andi Kleen, SuSE Labs
+ *
+ * Extended attribute support for tmpfs:
+ * Copyright (c) 2004, Luke Kenneth Casson Leighton <lkcl@lkcl.net>
+ * Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
+ *
+ * tiny-shmem:
+ * Copyright (c) 2004, 2008 Matt Mackall <mpm@selenic.com>
+ *
+ * This file is released under the GPL.
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/vfs.h>
+#include <linux/mount.h>
+#include <linux/ramfs.h>
+#include <linux/pagemap.h>
+#include <linux/file.h>
+#include <linux/fileattr.h>
+#include <linux/mm.h>
+#include <linux/random.h>
+#include <linux/sched/signal.h>
+#include <linux/export.h>
+#include <linux/swap.h>
+#include <linux/uio.h>
+#include <linux/hugetlb.h>
+#include <linux/fs_parser.h>
+#include <linux/swapfile.h>
+#include <linux/iversion.h>
+#include "swap.h"
+
+static struct vfsmount *shm_mnt;
+
+#ifdef CONFIG_SHMEM
+/*
+ * This virtual memory filesystem is heavily based on the ramfs. It
+ * extends ramfs by the ability to use swap and honor resource limits
+ * which makes it a completely usable filesystem.
+ */
+
+#include <linux/xattr.h>
+#include <linux/exportfs.h>
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/mman.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/backing-dev.h>
+#include <linux/shmem_fs.h>
+#include <linux/writeback.h>
+#include <linux/pagevec.h>
+#include <linux/percpu_counter.h>
+#include <linux/falloc.h>
+#include <linux/splice.h>
+#include <linux/security.h>
+#include <linux/swapops.h>
+#include <linux/mempolicy.h>
+#include <linux/namei.h>
+#include <linux/ctype.h>
+#include <linux/migrate.h>
+#include <linux/highmem.h>
+#include <linux/seq_file.h>
+#include <linux/magic.h>
+#include <linux/syscalls.h>
+#include <linux/fcntl.h>
+#include <uapi/linux/memfd.h>
+#include <linux/userfaultfd_k.h>
+#include <linux/rmap.h>
+#include <linux/uuid.h>
+
+#include <linux/uaccess.h>
+
+#include "internal.h"
+
+#define BLOCKS_PER_PAGE (PAGE_SIZE/512)
+#define VM_ACCT(size) (PAGE_ALIGN(size) >> PAGE_SHIFT)
+
+/* Pretend that each entry is of this size in directory's i_size */
+#define BOGO_DIRENT_SIZE 20
+
+/* Symlink up to this size is kmalloc'ed instead of using a swappable page */
+#define SHORT_SYMLINK_LEN 128
+
+/*
+ * shmem_fallocate communicates with shmem_fault or shmem_writepage via
+ * inode->i_private (with i_rwsem making sure that it has only one user at
+ * a time): we would prefer not to enlarge the shmem inode just for that.
+ */
+struct shmem_falloc {
+ wait_queue_head_t *waitq; /* faults into hole wait for punch to end */
+ pgoff_t start; /* start of range currently being fallocated */
+ pgoff_t next; /* the next page offset to be fallocated */
+ pgoff_t nr_falloced; /* how many new pages have been fallocated */
+ pgoff_t nr_unswapped; /* how often writepage refused to swap out */
+};
+
+struct shmem_options {
+ unsigned long long blocks;
+ unsigned long long inodes;
+ struct mempolicy *mpol;
+ kuid_t uid;
+ kgid_t gid;
+ umode_t mode;
+ bool full_inums;
+ int huge;
+ int seen;
+#define SHMEM_SEEN_BLOCKS 1
+#define SHMEM_SEEN_INODES 2
+#define SHMEM_SEEN_HUGE 4
+#define SHMEM_SEEN_INUMS 8
+};
+
+#ifdef CONFIG_TMPFS
+static unsigned long shmem_default_max_blocks(void)
+{
+ return totalram_pages() / 2;
+}
+
+static unsigned long shmem_default_max_inodes(void)
+{
+ unsigned long nr_pages = totalram_pages();
+
+ return min(nr_pages - totalhigh_pages(), nr_pages / 2);
+}
+#endif
+
+static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
+ struct folio **foliop, enum sgp_type sgp,
+ gfp_t gfp, struct vm_area_struct *vma,
+ vm_fault_t *fault_type);
+
+static inline struct shmem_sb_info *SHMEM_SB(struct super_block *sb)
+{
+ return sb->s_fs_info;
+}
+
+/*
+ * shmem_file_setup pre-accounts the whole fixed size of a VM object,
+ * for shared memory and for shared anonymous (/dev/zero) mappings
+ * (unless MAP_NORESERVE and sysctl_overcommit_memory <= 1),
+ * consistent with the pre-accounting of private mappings ...
+ */
+static inline int shmem_acct_size(unsigned long flags, loff_t size)
+{
+ return (flags & VM_NORESERVE) ?
+ 0 : security_vm_enough_memory_mm(current->mm, VM_ACCT(size));
+}
+
+static inline void shmem_unacct_size(unsigned long flags, loff_t size)
+{
+ if (!(flags & VM_NORESERVE))
+ vm_unacct_memory(VM_ACCT(size));
+}
+
+static inline int shmem_reacct_size(unsigned long flags,
+ loff_t oldsize, loff_t newsize)
+{
+ if (!(flags & VM_NORESERVE)) {
+ if (VM_ACCT(newsize) > VM_ACCT(oldsize))
+ return security_vm_enough_memory_mm(current->mm,
+ VM_ACCT(newsize) - VM_ACCT(oldsize));
+ else if (VM_ACCT(newsize) < VM_ACCT(oldsize))
+ vm_unacct_memory(VM_ACCT(oldsize) - VM_ACCT(newsize));
+ }
+ return 0;
+}
+
+/*
+ * ... whereas tmpfs objects are accounted incrementally as
+ * pages are allocated, in order to allow large sparse files.
+ * shmem_get_folio reports shmem_acct_block failure as -ENOSPC not -ENOMEM,
+ * so that a failure on a sparse tmpfs mapping will give SIGBUS not OOM.
+ */
+static inline int shmem_acct_block(unsigned long flags, long pages)
+{
+ if (!(flags & VM_NORESERVE))
+ return 0;
+
+ return security_vm_enough_memory_mm(current->mm,
+ pages * VM_ACCT(PAGE_SIZE));
+}
+
+static inline void shmem_unacct_blocks(unsigned long flags, long pages)
+{
+ if (flags & VM_NORESERVE)
+ vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE));
+}
+
+static inline bool shmem_inode_acct_block(struct inode *inode, long pages)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
+
+ if (shmem_acct_block(info->flags, pages))
+ return false;
+
+ if (sbinfo->max_blocks) {
+ if (percpu_counter_compare(&sbinfo->used_blocks,
+ sbinfo->max_blocks - pages) > 0)
+ goto unacct;
+ percpu_counter_add(&sbinfo->used_blocks, pages);
+ }
+
+ return true;
+
+unacct:
+ shmem_unacct_blocks(info->flags, pages);
+ return false;
+}
+
+static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
+
+ if (sbinfo->max_blocks)
+ percpu_counter_sub(&sbinfo->used_blocks, pages);
+ shmem_unacct_blocks(info->flags, pages);
+}
+
+static const struct super_operations shmem_ops;
+const struct address_space_operations shmem_aops;
+static const struct file_operations shmem_file_operations;
+static const struct inode_operations shmem_inode_operations;
+static const struct inode_operations shmem_dir_inode_operations;
+static const struct inode_operations shmem_special_inode_operations;
+static const struct vm_operations_struct shmem_vm_ops;
+static struct file_system_type shmem_fs_type;
+
+bool vma_is_shmem(struct vm_area_struct *vma)
+{
+ return vma->vm_ops == &shmem_vm_ops;
+}
+
+static LIST_HEAD(shmem_swaplist);
+static DEFINE_MUTEX(shmem_swaplist_mutex);
+
+/*
+ * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and
+ * produces a novel ino for the newly allocated inode.
+ *
+ * It may also be called when making a hard link to permit the space needed by
+ * each dentry. However, in that case, no new inode number is needed since that
+ * internally draws from another pool of inode numbers (currently global
+ * get_next_ino()). This case is indicated by passing NULL as inop.
+ */
+#define SHMEM_INO_BATCH 1024
+static int shmem_reserve_inode(struct super_block *sb, ino_t *inop)
+{
+ struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+ ino_t ino;
+
+ if (!(sb->s_flags & SB_KERNMOUNT)) {
+ raw_spin_lock(&sbinfo->stat_lock);
+ if (sbinfo->max_inodes) {
+ if (!sbinfo->free_inodes) {
+ raw_spin_unlock(&sbinfo->stat_lock);
+ return -ENOSPC;
+ }
+ sbinfo->free_inodes--;
+ }
+ if (inop) {
+ ino = sbinfo->next_ino++;
+ if (unlikely(is_zero_ino(ino)))
+ ino = sbinfo->next_ino++;
+ if (unlikely(!sbinfo->full_inums &&
+ ino > UINT_MAX)) {
+ /*
+ * Emulate get_next_ino uint wraparound for
+ * compatibility
+ */
+ if (IS_ENABLED(CONFIG_64BIT))
+ pr_warn("%s: inode number overflow on device %d, consider using inode64 mount option\n",
+ __func__, MINOR(sb->s_dev));
+ sbinfo->next_ino = 1;
+ ino = sbinfo->next_ino++;
+ }
+ *inop = ino;
+ }
+ raw_spin_unlock(&sbinfo->stat_lock);
+ } else if (inop) {
+ /*
+ * __shmem_file_setup, one of our callers, is lock-free: it
+ * doesn't hold stat_lock in shmem_reserve_inode since
+ * max_inodes is always 0, and is called from potentially
+ * unknown contexts. As such, use a per-cpu batched allocator
+ * which doesn't require the per-sb stat_lock unless we are at
+ * the batch boundary.
+ *
+ * We don't need to worry about inode{32,64} since SB_KERNMOUNT
+ * shmem mounts are not exposed to userspace, so we don't need
+ * to worry about things like glibc compatibility.
+ */
+ ino_t *next_ino;
+
+ next_ino = per_cpu_ptr(sbinfo->ino_batch, get_cpu());
+ ino = *next_ino;
+ if (unlikely(ino % SHMEM_INO_BATCH == 0)) {
+ raw_spin_lock(&sbinfo->stat_lock);
+ ino = sbinfo->next_ino;
+ sbinfo->next_ino += SHMEM_INO_BATCH;
+ raw_spin_unlock(&sbinfo->stat_lock);
+ if (unlikely(is_zero_ino(ino)))
+ ino++;
+ }
+ *inop = ino;
+ *next_ino = ++ino;
+ put_cpu();
+ }
+
+ return 0;
+}
+
+static void shmem_free_inode(struct super_block *sb)
+{
+ struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+ if (sbinfo->max_inodes) {
+ raw_spin_lock(&sbinfo->stat_lock);
+ sbinfo->free_inodes++;
+ raw_spin_unlock(&sbinfo->stat_lock);
+ }
+}
+
+/**
+ * shmem_recalc_inode - recalculate the block usage of an inode
+ * @inode: inode to recalc
+ *
+ * We have to calculate the free blocks since the mm can drop
+ * undirtied hole pages behind our back.
+ *
+ * But normally info->alloced == inode->i_mapping->nrpages + info->swapped
+ * So mm freed is info->alloced - (inode->i_mapping->nrpages + info->swapped)
+ *
+ * It has to be called with the spinlock held.
+ */
+static void shmem_recalc_inode(struct inode *inode)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ long freed;
+
+ freed = info->alloced - info->swapped - inode->i_mapping->nrpages;
+ if (freed > 0) {
+ info->alloced -= freed;
+ inode->i_blocks -= freed * BLOCKS_PER_PAGE;
+ shmem_inode_unacct_blocks(inode, freed);
+ }
+}
+
+bool shmem_charge(struct inode *inode, long pages)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ unsigned long flags;
+
+ if (!shmem_inode_acct_block(inode, pages))
+ return false;
+
+ /* nrpages adjustment first, then shmem_recalc_inode() when balanced */
+ inode->i_mapping->nrpages += pages;
+
+ spin_lock_irqsave(&info->lock, flags);
+ info->alloced += pages;
+ inode->i_blocks += pages * BLOCKS_PER_PAGE;
+ shmem_recalc_inode(inode);
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ return true;
+}
+
+void shmem_uncharge(struct inode *inode, long pages)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ unsigned long flags;
+
+ /* nrpages adjustment done by __filemap_remove_folio() or caller */
+
+ spin_lock_irqsave(&info->lock, flags);
+ info->alloced -= pages;
+ inode->i_blocks -= pages * BLOCKS_PER_PAGE;
+ shmem_recalc_inode(inode);
+ spin_unlock_irqrestore(&info->lock, flags);
+
+ shmem_inode_unacct_blocks(inode, pages);
+}
+
+/*
+ * Replace item expected in xarray by a new item, while holding xa_lock.
+ */
+static int shmem_replace_entry(struct address_space *mapping,
+ pgoff_t index, void *expected, void *replacement)
+{
+ XA_STATE(xas, &mapping->i_pages, index);
+ void *item;
+
+ VM_BUG_ON(!expected);
+ VM_BUG_ON(!replacement);
+ item = xas_load(&xas);
+ if (item != expected)
+ return -ENOENT;
+ xas_store(&xas, replacement);
+ return 0;
+}
+
+/*
+ * Sometimes, before we decide whether to proceed or to fail, we must check
+ * that an entry was not already brought back from swap by a racing thread.
+ *
+ * Checking page is not enough: by the time a SwapCache page is locked, it
+ * might be reused, and again be SwapCache, using the same swap as before.
+ */
+static bool shmem_confirm_swap(struct address_space *mapping,
+ pgoff_t index, swp_entry_t swap)
+{
+ return xa_load(&mapping->i_pages, index) == swp_to_radix_entry(swap);
+}
+
+/*
+ * Definitions for "huge tmpfs": tmpfs mounted with the huge= option
+ *
+ * SHMEM_HUGE_NEVER:
+ * disables huge pages for the mount;
+ * SHMEM_HUGE_ALWAYS:
+ * enables huge pages for the mount;
+ * SHMEM_HUGE_WITHIN_SIZE:
+ * only allocate huge pages if the page will be fully within i_size,
+ * also respect fadvise()/madvise() hints;
+ * SHMEM_HUGE_ADVISE:
+ * only allocate huge pages if requested with fadvise()/madvise();
+ */
+
+#define SHMEM_HUGE_NEVER 0
+#define SHMEM_HUGE_ALWAYS 1
+#define SHMEM_HUGE_WITHIN_SIZE 2
+#define SHMEM_HUGE_ADVISE 3
+
+/*
+ * Special values.
+ * Only can be set via /sys/kernel/mm/transparent_hugepage/shmem_enabled:
+ *
+ * SHMEM_HUGE_DENY:
+ * disables huge on shm_mnt and all mounts, for emergency use;
+ * SHMEM_HUGE_FORCE:
+ * enables huge on shm_mnt and all mounts, w/o needing option, for testing;
+ *
+ */
+#define SHMEM_HUGE_DENY (-1)
+#define SHMEM_HUGE_FORCE (-2)
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+/* ifdef here to avoid bloating shmem.o when not necessary */
+
+static int shmem_huge __read_mostly = SHMEM_HUGE_NEVER;
+
+bool shmem_is_huge(struct vm_area_struct *vma, struct inode *inode,
+ pgoff_t index, bool shmem_huge_force)
+{
+ loff_t i_size;
+
+ if (!S_ISREG(inode->i_mode))
+ return false;
+ if (vma && ((vma->vm_flags & VM_NOHUGEPAGE) ||
+ test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)))
+ return false;
+ if (shmem_huge == SHMEM_HUGE_DENY)
+ return false;
+ if (shmem_huge_force || shmem_huge == SHMEM_HUGE_FORCE)
+ return true;
+
+ switch (SHMEM_SB(inode->i_sb)->huge) {
+ case SHMEM_HUGE_ALWAYS:
+ return true;
+ case SHMEM_HUGE_WITHIN_SIZE:
+ index = round_up(index + 1, HPAGE_PMD_NR);
+ i_size = round_up(i_size_read(inode), PAGE_SIZE);
+ if (i_size >> PAGE_SHIFT >= index)
+ return true;
+ fallthrough;
+ case SHMEM_HUGE_ADVISE:
+ if (vma && (vma->vm_flags & VM_HUGEPAGE))
+ return true;
+ fallthrough;
+ default:
+ return false;
+ }
+}
+
+#if defined(CONFIG_SYSFS)
+static int shmem_parse_huge(const char *str)
+{
+ if (!strcmp(str, "never"))
+ return SHMEM_HUGE_NEVER;
+ if (!strcmp(str, "always"))
+ return SHMEM_HUGE_ALWAYS;
+ if (!strcmp(str, "within_size"))
+ return SHMEM_HUGE_WITHIN_SIZE;
+ if (!strcmp(str, "advise"))
+ return SHMEM_HUGE_ADVISE;
+ if (!strcmp(str, "deny"))
+ return SHMEM_HUGE_DENY;
+ if (!strcmp(str, "force"))
+ return SHMEM_HUGE_FORCE;
+ return -EINVAL;
+}
+#endif
+
+#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
+static const char *shmem_format_huge(int huge)
+{
+ switch (huge) {
+ case SHMEM_HUGE_NEVER:
+ return "never";
+ case SHMEM_HUGE_ALWAYS:
+ return "always";
+ case SHMEM_HUGE_WITHIN_SIZE:
+ return "within_size";
+ case SHMEM_HUGE_ADVISE:
+ return "advise";
+ case SHMEM_HUGE_DENY:
+ return "deny";
+ case SHMEM_HUGE_FORCE:
+ return "force";
+ default:
+ VM_BUG_ON(1);
+ return "bad_val";
+ }
+}
+#endif
+
+static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
+ struct shrink_control *sc, unsigned long nr_to_split)
+{
+ LIST_HEAD(list), *pos, *next;
+ LIST_HEAD(to_remove);
+ struct inode *inode;
+ struct shmem_inode_info *info;
+ struct folio *folio;
+ unsigned long batch = sc ? sc->nr_to_scan : 128;
+ int split = 0;
+
+ if (list_empty(&sbinfo->shrinklist))
+ return SHRINK_STOP;
+
+ spin_lock(&sbinfo->shrinklist_lock);
+ list_for_each_safe(pos, next, &sbinfo->shrinklist) {
+ info = list_entry(pos, struct shmem_inode_info, shrinklist);
+
+ /* pin the inode */
+ inode = igrab(&info->vfs_inode);
+
+ /* inode is about to be evicted */
+ if (!inode) {
+ list_del_init(&info->shrinklist);
+ goto next;
+ }
+
+ /* Check if there's anything to gain */
+ if (round_up(inode->i_size, PAGE_SIZE) ==
+ round_up(inode->i_size, HPAGE_PMD_SIZE)) {
+ list_move(&info->shrinklist, &to_remove);
+ goto next;
+ }
+
+ list_move(&info->shrinklist, &list);
+next:
+ sbinfo->shrinklist_len--;
+ if (!--batch)
+ break;
+ }
+ spin_unlock(&sbinfo->shrinklist_lock);
+
+ list_for_each_safe(pos, next, &to_remove) {
+ info = list_entry(pos, struct shmem_inode_info, shrinklist);
+ inode = &info->vfs_inode;
+ list_del_init(&info->shrinklist);
+ iput(inode);
+ }
+
+ list_for_each_safe(pos, next, &list) {
+ int ret;
+ pgoff_t index;
+
+ info = list_entry(pos, struct shmem_inode_info, shrinklist);
+ inode = &info->vfs_inode;
+
+ if (nr_to_split && split >= nr_to_split)
+ goto move_back;
+
+ index = (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT;
+ folio = filemap_get_folio(inode->i_mapping, index);
+ if (!folio)
+ goto drop;
+
+ /* No huge page at the end of the file: nothing to split */
+ if (!folio_test_large(folio)) {
+ folio_put(folio);
+ goto drop;
+ }
+
+ /*
+ * Move the inode on the list back to shrinklist if we failed
+ * to lock the page at this time.
+ *
+ * Waiting for the lock may lead to deadlock in the
+ * reclaim path.
+ */
+ if (!folio_trylock(folio)) {
+ folio_put(folio);
+ goto move_back;
+ }
+
+ ret = split_folio(folio);
+ folio_unlock(folio);
+ folio_put(folio);
+
+ /* If split failed move the inode on the list back to shrinklist */
+ if (ret)
+ goto move_back;
+
+ split++;
+drop:
+ list_del_init(&info->shrinklist);
+ goto put;
+move_back:
+ /*
+ * Make sure the inode is either on the global list or deleted
+ * from any local list before iput() since it could be deleted
+ * in another thread once we put the inode (then the local list
+ * is corrupted).
+ */
+ spin_lock(&sbinfo->shrinklist_lock);
+ list_move(&info->shrinklist, &sbinfo->shrinklist);
+ sbinfo->shrinklist_len++;
+ spin_unlock(&sbinfo->shrinklist_lock);
+put:
+ iput(inode);
+ }
+
+ return split;
+}
+
+static long shmem_unused_huge_scan(struct super_block *sb,
+ struct shrink_control *sc)
+{
+ struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+
+ if (!READ_ONCE(sbinfo->shrinklist_len))
+ return SHRINK_STOP;
+
+ return shmem_unused_huge_shrink(sbinfo, sc, 0);
+}
+
+static long shmem_unused_huge_count(struct super_block *sb,
+ struct shrink_control *sc)
+{
+ struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+ return READ_ONCE(sbinfo->shrinklist_len);
+}
+#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
+
+#define shmem_huge SHMEM_HUGE_DENY
+
+bool shmem_is_huge(struct vm_area_struct *vma, struct inode *inode,
+ pgoff_t index, bool shmem_huge_force)
+{
+ return false;
+}
+
+static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
+ struct shrink_control *sc, unsigned long nr_to_split)
+{
+ return 0;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+/*
+ * Like filemap_add_folio, but error if expected item has gone.
+ */
+static int shmem_add_to_page_cache(struct folio *folio,
+ struct address_space *mapping,
+ pgoff_t index, void *expected, gfp_t gfp,
+ struct mm_struct *charge_mm)
+{
+ XA_STATE_ORDER(xas, &mapping->i_pages, index, folio_order(folio));
+ long nr = folio_nr_pages(folio);
+ int error;
+
+ VM_BUG_ON_FOLIO(index != round_down(index, nr), folio);
+ VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
+ VM_BUG_ON_FOLIO(!folio_test_swapbacked(folio), folio);
+ VM_BUG_ON(expected && folio_test_large(folio));
+
+ folio_ref_add(folio, nr);
+ folio->mapping = mapping;
+ folio->index = index;
+
+ if (!folio_test_swapcache(folio)) {
+ error = mem_cgroup_charge(folio, charge_mm, gfp);
+ if (error) {
+ if (folio_test_pmd_mappable(folio)) {
+ count_vm_event(THP_FILE_FALLBACK);
+ count_vm_event(THP_FILE_FALLBACK_CHARGE);
+ }
+ goto error;
+ }
+ }
+ folio_throttle_swaprate(folio, gfp);
+
+ do {
+ xas_lock_irq(&xas);
+ if (expected != xas_find_conflict(&xas)) {
+ xas_set_err(&xas, -EEXIST);
+ goto unlock;
+ }
+ if (expected && xas_find_conflict(&xas)) {
+ xas_set_err(&xas, -EEXIST);
+ goto unlock;
+ }
+ xas_store(&xas, folio);
+ if (xas_error(&xas))
+ goto unlock;
+ if (folio_test_pmd_mappable(folio)) {
+ count_vm_event(THP_FILE_ALLOC);
+ __lruvec_stat_mod_folio(folio, NR_SHMEM_THPS, nr);
+ }
+ mapping->nrpages += nr;
+ __lruvec_stat_mod_folio(folio, NR_FILE_PAGES, nr);
+ __lruvec_stat_mod_folio(folio, NR_SHMEM, nr);
+unlock:
+ xas_unlock_irq(&xas);
+ } while (xas_nomem(&xas, gfp));
+
+ if (xas_error(&xas)) {
+ error = xas_error(&xas);
+ goto error;
+ }
+
+ return 0;
+error:
+ folio->mapping = NULL;
+ folio_ref_sub(folio, nr);
+ return error;
+}
+
+/*
+ * Like delete_from_page_cache, but substitutes swap for @folio.
+ */
+static void shmem_delete_from_page_cache(struct folio *folio, void *radswap)
+{
+ struct address_space *mapping = folio->mapping;
+ long nr = folio_nr_pages(folio);
+ int error;
+
+ xa_lock_irq(&mapping->i_pages);
+ error = shmem_replace_entry(mapping, folio->index, folio, radswap);
+ folio->mapping = NULL;
+ mapping->nrpages -= nr;
+ __lruvec_stat_mod_folio(folio, NR_FILE_PAGES, -nr);
+ __lruvec_stat_mod_folio(folio, NR_SHMEM, -nr);
+ xa_unlock_irq(&mapping->i_pages);
+ folio_put(folio);
+ BUG_ON(error);
+}
+
+/*
+ * Remove swap entry from page cache, free the swap and its page cache.
+ */
+static int shmem_free_swap(struct address_space *mapping,
+ pgoff_t index, void *radswap)
+{
+ void *old;
+
+ old = xa_cmpxchg_irq(&mapping->i_pages, index, radswap, NULL, 0);
+ if (old != radswap)
+ return -ENOENT;
+ free_swap_and_cache(radix_to_swp_entry(radswap));
+ return 0;
+}
+
+/*
+ * Determine (in bytes) how many of the shmem object's pages mapped by the
+ * given offsets are swapped out.
+ *
+ * This is safe to call without i_rwsem or the i_pages lock thanks to RCU,
+ * as long as the inode doesn't go away and racy results are not a problem.
+ */
+unsigned long shmem_partial_swap_usage(struct address_space *mapping,
+ pgoff_t start, pgoff_t end)
+{
+ XA_STATE(xas, &mapping->i_pages, start);
+ struct page *page;
+ unsigned long swapped = 0;
+ unsigned long max = end - 1;
+
+ rcu_read_lock();
+ xas_for_each(&xas, page, max) {
+ if (xas_retry(&xas, page))
+ continue;
+ if (xa_is_value(page))
+ swapped++;
+ if (xas.xa_index == max)
+ break;
+ if (need_resched()) {
+ xas_pause(&xas);
+ cond_resched_rcu();
+ }
+ }
+
+ rcu_read_unlock();
+
+ return swapped << PAGE_SHIFT;
+}
+
+/*
+ * Determine (in bytes) how many of the shmem object's pages mapped by the
+ * given vma is swapped out.
+ *
+ * This is safe to call without i_rwsem or the i_pages lock thanks to RCU,
+ * as long as the inode doesn't go away and racy results are not a problem.
+ */
+unsigned long shmem_swap_usage(struct vm_area_struct *vma)
+{
+ struct inode *inode = file_inode(vma->vm_file);
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct address_space *mapping = inode->i_mapping;
+ unsigned long swapped;
+
+ /* Be careful as we don't hold info->lock */
+ swapped = READ_ONCE(info->swapped);
+
+ /*
+ * The easier cases are when the shmem object has nothing in swap, or
+ * the vma maps it whole. Then we can simply use the stats that we
+ * already track.
+ */
+ if (!swapped)
+ return 0;
+
+ if (!vma->vm_pgoff && vma->vm_end - vma->vm_start >= inode->i_size)
+ return swapped << PAGE_SHIFT;
+
+ /* Here comes the more involved part */
+ return shmem_partial_swap_usage(mapping, vma->vm_pgoff,
+ vma->vm_pgoff + vma_pages(vma));
+}
+
+/*
+ * SysV IPC SHM_UNLOCK restore Unevictable pages to their evictable lists.
+ */
+void shmem_unlock_mapping(struct address_space *mapping)
+{
+ struct folio_batch fbatch;
+ pgoff_t index = 0;
+
+ folio_batch_init(&fbatch);
+ /*
+ * Minor point, but we might as well stop if someone else SHM_LOCKs it.
+ */
+ while (!mapping_unevictable(mapping) &&
+ filemap_get_folios(mapping, &index, ~0UL, &fbatch)) {
+ check_move_unevictable_folios(&fbatch);
+ folio_batch_release(&fbatch);
+ cond_resched();
+ }
+}
+
+static struct folio *shmem_get_partial_folio(struct inode *inode, pgoff_t index)
+{
+ struct folio *folio;
+
+ /*
+ * At first avoid shmem_get_folio(,,,SGP_READ): that fails
+ * beyond i_size, and reports fallocated pages as holes.
+ */
+ folio = __filemap_get_folio(inode->i_mapping, index,
+ FGP_ENTRY | FGP_LOCK, 0);
+ if (!xa_is_value(folio))
+ return folio;
+ /*
+ * But read a page back from swap if any of it is within i_size
+ * (although in some cases this is just a waste of time).
+ */
+ folio = NULL;
+ shmem_get_folio(inode, index, &folio, SGP_READ);
+ return folio;
+}
+
+/*
+ * Remove range of pages and swap entries from page cache, and free them.
+ * If !unfalloc, truncate or punch hole; if unfalloc, undo failed fallocate.
+ */
+static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
+ bool unfalloc)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ pgoff_t start = (lstart + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ pgoff_t end = (lend + 1) >> PAGE_SHIFT;
+ struct folio_batch fbatch;
+ pgoff_t indices[PAGEVEC_SIZE];
+ struct folio *folio;
+ bool same_folio;
+ long nr_swaps_freed = 0;
+ pgoff_t index;
+ int i;
+
+ if (lend == -1)
+ end = -1; /* unsigned, so actually very big */
+
+ if (info->fallocend > start && info->fallocend <= end && !unfalloc)
+ info->fallocend = start;
+
+ folio_batch_init(&fbatch);
+ index = start;
+ while (index < end && find_lock_entries(mapping, index, end - 1,
+ &fbatch, indices)) {
+ for (i = 0; i < folio_batch_count(&fbatch); i++) {
+ folio = fbatch.folios[i];
+
+ index = indices[i];
+
+ if (xa_is_value(folio)) {
+ if (unfalloc)
+ continue;
+ nr_swaps_freed += !shmem_free_swap(mapping,
+ index, folio);
+ continue;
+ }
+ index += folio_nr_pages(folio) - 1;
+
+ if (!unfalloc || !folio_test_uptodate(folio))
+ truncate_inode_folio(mapping, folio);
+ folio_unlock(folio);
+ }
+ folio_batch_remove_exceptionals(&fbatch);
+ folio_batch_release(&fbatch);
+ cond_resched();
+ index++;
+ }
+
+ /*
+ * When undoing a failed fallocate, we want none of the partial folio
+ * zeroing and splitting below, but shall want to truncate the whole
+ * folio when !uptodate indicates that it was added by this fallocate,
+ * even when [lstart, lend] covers only a part of the folio.
+ */
+ if (unfalloc)
+ goto whole_folios;
+
+ same_folio = (lstart >> PAGE_SHIFT) == (lend >> PAGE_SHIFT);
+ folio = shmem_get_partial_folio(inode, lstart >> PAGE_SHIFT);
+ if (folio) {
+ same_folio = lend < folio_pos(folio) + folio_size(folio);
+ folio_mark_dirty(folio);
+ if (!truncate_inode_partial_folio(folio, lstart, lend)) {
+ start = folio->index + folio_nr_pages(folio);
+ if (same_folio)
+ end = folio->index;
+ }
+ folio_unlock(folio);
+ folio_put(folio);
+ folio = NULL;
+ }
+
+ if (!same_folio)
+ folio = shmem_get_partial_folio(inode, lend >> PAGE_SHIFT);
+ if (folio) {
+ folio_mark_dirty(folio);
+ if (!truncate_inode_partial_folio(folio, lstart, lend))
+ end = folio->index;
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+
+whole_folios:
+
+ index = start;
+ while (index < end) {
+ cond_resched();
+
+ if (!find_get_entries(mapping, index, end - 1, &fbatch,
+ indices)) {
+ /* If all gone or hole-punch or unfalloc, we're done */
+ if (index == start || end != -1)
+ break;
+ /* But if truncating, restart to make sure all gone */
+ index = start;
+ continue;
+ }
+ for (i = 0; i < folio_batch_count(&fbatch); i++) {
+ folio = fbatch.folios[i];
+
+ index = indices[i];
+ if (xa_is_value(folio)) {
+ if (unfalloc)
+ continue;
+ if (shmem_free_swap(mapping, index, folio)) {
+ /* Swap was replaced by page: retry */
+ index--;
+ break;
+ }
+ nr_swaps_freed++;
+ continue;
+ }
+
+ folio_lock(folio);
+
+ if (!unfalloc || !folio_test_uptodate(folio)) {
+ if (folio_mapping(folio) != mapping) {
+ /* Page was replaced by swap: retry */
+ folio_unlock(folio);
+ index--;
+ break;
+ }
+ VM_BUG_ON_FOLIO(folio_test_writeback(folio),
+ folio);
+
+ if (!folio_test_large(folio)) {
+ truncate_inode_folio(mapping, folio);
+ } else if (truncate_inode_partial_folio(folio, lstart, lend)) {
+ /*
+ * If we split a page, reset the loop so
+ * that we pick up the new sub pages.
+ * Otherwise the THP was entirely
+ * dropped or the target range was
+ * zeroed, so just continue the loop as
+ * is.
+ */
+ if (!folio_test_large(folio)) {
+ folio_unlock(folio);
+ index = start;
+ break;
+ }
+ }
+ }
+ index = folio->index + folio_nr_pages(folio) - 1;
+ folio_unlock(folio);
+ }
+ folio_batch_remove_exceptionals(&fbatch);
+ folio_batch_release(&fbatch);
+ index++;
+ }
+
+ spin_lock_irq(&info->lock);
+ info->swapped -= nr_swaps_freed;
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+}
+
+void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
+{
+ shmem_undo_range(inode, lstart, lend, false);
+ inode->i_ctime = inode->i_mtime = current_time(inode);
+ inode_inc_iversion(inode);
+}
+EXPORT_SYMBOL_GPL(shmem_truncate_range);
+
+static int shmem_getattr(struct user_namespace *mnt_userns,
+ const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags)
+{
+ struct inode *inode = path->dentry->d_inode;
+ struct shmem_inode_info *info = SHMEM_I(inode);
+
+ if (info->alloced - info->swapped != inode->i_mapping->nrpages) {
+ spin_lock_irq(&info->lock);
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+ }
+ if (info->fsflags & FS_APPEND_FL)
+ stat->attributes |= STATX_ATTR_APPEND;
+ if (info->fsflags & FS_IMMUTABLE_FL)
+ stat->attributes |= STATX_ATTR_IMMUTABLE;
+ if (info->fsflags & FS_NODUMP_FL)
+ stat->attributes |= STATX_ATTR_NODUMP;
+ stat->attributes_mask |= (STATX_ATTR_APPEND |
+ STATX_ATTR_IMMUTABLE |
+ STATX_ATTR_NODUMP);
+ generic_fillattr(&init_user_ns, inode, stat);
+
+ if (shmem_is_huge(NULL, inode, 0, false))
+ stat->blksize = HPAGE_PMD_SIZE;
+
+ if (request_mask & STATX_BTIME) {
+ stat->result_mask |= STATX_BTIME;
+ stat->btime.tv_sec = info->i_crtime.tv_sec;
+ stat->btime.tv_nsec = info->i_crtime.tv_nsec;
+ }
+
+ return 0;
+}
+
+static int shmem_setattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = d_inode(dentry);
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ int error;
+ bool update_mtime = false;
+ bool update_ctime = true;
+
+ error = setattr_prepare(&init_user_ns, dentry, attr);
+ if (error)
+ return error;
+
+ if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
+ loff_t oldsize = inode->i_size;
+ loff_t newsize = attr->ia_size;
+
+ /* protected by i_rwsem */
+ if ((newsize < oldsize && (info->seals & F_SEAL_SHRINK)) ||
+ (newsize > oldsize && (info->seals & F_SEAL_GROW)))
+ return -EPERM;
+
+ if (newsize != oldsize) {
+ error = shmem_reacct_size(SHMEM_I(inode)->flags,
+ oldsize, newsize);
+ if (error)
+ return error;
+ i_size_write(inode, newsize);
+ update_mtime = true;
+ } else {
+ update_ctime = false;
+ }
+ if (newsize <= oldsize) {
+ loff_t holebegin = round_up(newsize, PAGE_SIZE);
+ if (oldsize > holebegin)
+ unmap_mapping_range(inode->i_mapping,
+ holebegin, 0, 1);
+ if (info->alloced)
+ shmem_truncate_range(inode,
+ newsize, (loff_t)-1);
+ /* unmap again to remove racily COWed private pages */
+ if (oldsize > holebegin)
+ unmap_mapping_range(inode->i_mapping,
+ holebegin, 0, 1);
+ }
+ }
+
+ setattr_copy(&init_user_ns, inode, attr);
+ if (attr->ia_valid & ATTR_MODE)
+ error = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
+ if (!error && update_ctime) {
+ inode->i_ctime = current_time(inode);
+ if (update_mtime)
+ inode->i_mtime = inode->i_ctime;
+ inode_inc_iversion(inode);
+ }
+ return error;
+}
+
+static void shmem_evict_inode(struct inode *inode)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
+
+ if (shmem_mapping(inode->i_mapping)) {
+ shmem_unacct_size(info->flags, inode->i_size);
+ inode->i_size = 0;
+ mapping_set_exiting(inode->i_mapping);
+ shmem_truncate_range(inode, 0, (loff_t)-1);
+ if (!list_empty(&info->shrinklist)) {
+ spin_lock(&sbinfo->shrinklist_lock);
+ if (!list_empty(&info->shrinklist)) {
+ list_del_init(&info->shrinklist);
+ sbinfo->shrinklist_len--;
+ }
+ spin_unlock(&sbinfo->shrinklist_lock);
+ }
+ while (!list_empty(&info->swaplist)) {
+ /* Wait while shmem_unuse() is scanning this inode... */
+ wait_var_event(&info->stop_eviction,
+ !atomic_read(&info->stop_eviction));
+ mutex_lock(&shmem_swaplist_mutex);
+ /* ...but beware of the race if we peeked too early */
+ if (!atomic_read(&info->stop_eviction))
+ list_del_init(&info->swaplist);
+ mutex_unlock(&shmem_swaplist_mutex);
+ }
+ }
+
+ simple_xattrs_free(&info->xattrs);
+ WARN_ON(inode->i_blocks);
+ shmem_free_inode(inode->i_sb);
+ clear_inode(inode);
+}
+
+static int shmem_find_swap_entries(struct address_space *mapping,
+ pgoff_t start, struct folio_batch *fbatch,
+ pgoff_t *indices, unsigned int type)
+{
+ XA_STATE(xas, &mapping->i_pages, start);
+ struct folio *folio;
+ swp_entry_t entry;
+
+ rcu_read_lock();
+ xas_for_each(&xas, folio, ULONG_MAX) {
+ if (xas_retry(&xas, folio))
+ continue;
+
+ if (!xa_is_value(folio))
+ continue;
+
+ entry = radix_to_swp_entry(folio);
+ /*
+ * swapin error entries can be found in the mapping. But they're
+ * deliberately ignored here as we've done everything we can do.
+ */
+ if (swp_type(entry) != type)
+ continue;
+
+ indices[folio_batch_count(fbatch)] = xas.xa_index;
+ if (!folio_batch_add(fbatch, folio))
+ break;
+
+ if (need_resched()) {
+ xas_pause(&xas);
+ cond_resched_rcu();
+ }
+ }
+ rcu_read_unlock();
+
+ return xas.xa_index;
+}
+
+/*
+ * Move the swapped pages for an inode to page cache. Returns the count
+ * of pages swapped in, or the error in case of failure.
+ */
+static int shmem_unuse_swap_entries(struct inode *inode,
+ struct folio_batch *fbatch, pgoff_t *indices)
+{
+ int i = 0;
+ int ret = 0;
+ int error = 0;
+ struct address_space *mapping = inode->i_mapping;
+
+ for (i = 0; i < folio_batch_count(fbatch); i++) {
+ struct folio *folio = fbatch->folios[i];
+
+ if (!xa_is_value(folio))
+ continue;
+ error = shmem_swapin_folio(inode, indices[i],
+ &folio, SGP_CACHE,
+ mapping_gfp_mask(mapping),
+ NULL, NULL);
+ if (error == 0) {
+ folio_unlock(folio);
+ folio_put(folio);
+ ret++;
+ }
+ if (error == -ENOMEM)
+ break;
+ error = 0;
+ }
+ return error ? error : ret;
+}
+
+/*
+ * If swap found in inode, free it and move page from swapcache to filecache.
+ */
+static int shmem_unuse_inode(struct inode *inode, unsigned int type)
+{
+ struct address_space *mapping = inode->i_mapping;
+ pgoff_t start = 0;
+ struct folio_batch fbatch;
+ pgoff_t indices[PAGEVEC_SIZE];
+ int ret = 0;
+
+ do {
+ folio_batch_init(&fbatch);
+ shmem_find_swap_entries(mapping, start, &fbatch, indices, type);
+ if (folio_batch_count(&fbatch) == 0) {
+ ret = 0;
+ break;
+ }
+
+ ret = shmem_unuse_swap_entries(inode, &fbatch, indices);
+ if (ret < 0)
+ break;
+
+ start = indices[folio_batch_count(&fbatch) - 1];
+ } while (true);
+
+ return ret;
+}
+
+/*
+ * Read all the shared memory data that resides in the swap
+ * device 'type' back into memory, so the swap device can be
+ * unused.
+ */
+int shmem_unuse(unsigned int type)
+{
+ struct shmem_inode_info *info, *next;
+ int error = 0;
+
+ if (list_empty(&shmem_swaplist))
+ return 0;
+
+ mutex_lock(&shmem_swaplist_mutex);
+ list_for_each_entry_safe(info, next, &shmem_swaplist, swaplist) {
+ if (!info->swapped) {
+ list_del_init(&info->swaplist);
+ continue;
+ }
+ /*
+ * Drop the swaplist mutex while searching the inode for swap;
+ * but before doing so, make sure shmem_evict_inode() will not
+ * remove placeholder inode from swaplist, nor let it be freed
+ * (igrab() would protect from unlink, but not from unmount).
+ */
+ atomic_inc(&info->stop_eviction);
+ mutex_unlock(&shmem_swaplist_mutex);
+
+ error = shmem_unuse_inode(&info->vfs_inode, type);
+ cond_resched();
+
+ mutex_lock(&shmem_swaplist_mutex);
+ next = list_next_entry(info, swaplist);
+ if (!info->swapped)
+ list_del_init(&info->swaplist);
+ if (atomic_dec_and_test(&info->stop_eviction))
+ wake_up_var(&info->stop_eviction);
+ if (error)
+ break;
+ }
+ mutex_unlock(&shmem_swaplist_mutex);
+
+ return error;
+}
+
+/*
+ * Move the page from the page cache to the swap cache.
+ */
+static int shmem_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct folio *folio = page_folio(page);
+ struct shmem_inode_info *info;
+ struct address_space *mapping;
+ struct inode *inode;
+ swp_entry_t swap;
+ pgoff_t index;
+
+ /*
+ * If /sys/kernel/mm/transparent_hugepage/shmem_enabled is "always" or
+ * "force", drivers/gpu/drm/i915/gem/i915_gem_shmem.c gets huge pages,
+ * and its shmem_writeback() needs them to be split when swapping.
+ */
+ if (folio_test_large(folio)) {
+ /* Ensure the subpages are still dirty */
+ folio_test_set_dirty(folio);
+ if (split_huge_page(page) < 0)
+ goto redirty;
+ folio = page_folio(page);
+ folio_clear_dirty(folio);
+ }
+
+ BUG_ON(!folio_test_locked(folio));
+ mapping = folio->mapping;
+ index = folio->index;
+ inode = mapping->host;
+ info = SHMEM_I(inode);
+ if (info->flags & VM_LOCKED)
+ goto redirty;
+ if (!total_swap_pages)
+ goto redirty;
+
+ /*
+ * Our capabilities prevent regular writeback or sync from ever calling
+ * shmem_writepage; but a stacking filesystem might use ->writepage of
+ * its underlying filesystem, in which case tmpfs should write out to
+ * swap only in response to memory pressure, and not for the writeback
+ * threads or sync.
+ */
+ if (!wbc->for_reclaim) {
+ WARN_ON_ONCE(1); /* Still happens? Tell us about it! */
+ goto redirty;
+ }
+
+ /*
+ * This is somewhat ridiculous, but without plumbing a SWAP_MAP_FALLOC
+ * value into swapfile.c, the only way we can correctly account for a
+ * fallocated folio arriving here is now to initialize it and write it.
+ *
+ * That's okay for a folio already fallocated earlier, but if we have
+ * not yet completed the fallocation, then (a) we want to keep track
+ * of this folio in case we have to undo it, and (b) it may not be a
+ * good idea to continue anyway, once we're pushing into swap. So
+ * reactivate the folio, and let shmem_fallocate() quit when too many.
+ */
+ if (!folio_test_uptodate(folio)) {
+ if (inode->i_private) {
+ struct shmem_falloc *shmem_falloc;
+ spin_lock(&inode->i_lock);
+ shmem_falloc = inode->i_private;
+ if (shmem_falloc &&
+ !shmem_falloc->waitq &&
+ index >= shmem_falloc->start &&
+ index < shmem_falloc->next)
+ shmem_falloc->nr_unswapped++;
+ else
+ shmem_falloc = NULL;
+ spin_unlock(&inode->i_lock);
+ if (shmem_falloc)
+ goto redirty;
+ }
+ folio_zero_range(folio, 0, folio_size(folio));
+ flush_dcache_folio(folio);
+ folio_mark_uptodate(folio);
+ }
+
+ swap = folio_alloc_swap(folio);
+ if (!swap.val)
+ goto redirty;
+
+ /*
+ * Add inode to shmem_unuse()'s list of swapped-out inodes,
+ * if it's not already there. Do it now before the folio is
+ * moved to swap cache, when its pagelock no longer protects
+ * the inode from eviction. But don't unlock the mutex until
+ * we've incremented swapped, because shmem_unuse_inode() will
+ * prune a !swapped inode from the swaplist under this mutex.
+ */
+ mutex_lock(&shmem_swaplist_mutex);
+ if (list_empty(&info->swaplist))
+ list_add(&info->swaplist, &shmem_swaplist);
+
+ if (add_to_swap_cache(folio, swap,
+ __GFP_HIGH | __GFP_NOMEMALLOC | __GFP_NOWARN,
+ NULL) == 0) {
+ spin_lock_irq(&info->lock);
+ shmem_recalc_inode(inode);
+ info->swapped++;
+ spin_unlock_irq(&info->lock);
+
+ swap_shmem_alloc(swap);
+ shmem_delete_from_page_cache(folio, swp_to_radix_entry(swap));
+
+ mutex_unlock(&shmem_swaplist_mutex);
+ BUG_ON(folio_mapped(folio));
+ swap_writepage(&folio->page, wbc);
+ return 0;
+ }
+
+ mutex_unlock(&shmem_swaplist_mutex);
+ put_swap_folio(folio, swap);
+redirty:
+ folio_mark_dirty(folio);
+ if (wbc->for_reclaim)
+ return AOP_WRITEPAGE_ACTIVATE; /* Return with folio locked */
+ folio_unlock(folio);
+ return 0;
+}
+
+#if defined(CONFIG_NUMA) && defined(CONFIG_TMPFS)
+static void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
+{
+ char buffer[64];
+
+ if (!mpol || mpol->mode == MPOL_DEFAULT)
+ return; /* show nothing */
+
+ mpol_to_str(buffer, sizeof(buffer), mpol);
+
+ seq_printf(seq, ",mpol=%s", buffer);
+}
+
+static struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
+{
+ struct mempolicy *mpol = NULL;
+ if (sbinfo->mpol) {
+ raw_spin_lock(&sbinfo->stat_lock); /* prevent replace/use races */
+ mpol = sbinfo->mpol;
+ mpol_get(mpol);
+ raw_spin_unlock(&sbinfo->stat_lock);
+ }
+ return mpol;
+}
+#else /* !CONFIG_NUMA || !CONFIG_TMPFS */
+static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
+{
+}
+static inline struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
+{
+ return NULL;
+}
+#endif /* CONFIG_NUMA && CONFIG_TMPFS */
+#ifndef CONFIG_NUMA
+#define vm_policy vm_private_data
+#endif
+
+static void shmem_pseudo_vma_init(struct vm_area_struct *vma,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ /* Create a pseudo vma that just contains the policy */
+ vma_init(vma, NULL);
+ /* Bias interleave by inode number to distribute better across nodes */
+ vma->vm_pgoff = index + info->vfs_inode.i_ino;
+ vma->vm_policy = mpol_shared_policy_lookup(&info->policy, index);
+}
+
+static void shmem_pseudo_vma_destroy(struct vm_area_struct *vma)
+{
+ /* Drop reference taken by mpol_shared_policy_lookup() */
+ mpol_cond_put(vma->vm_policy);
+}
+
+static struct folio *shmem_swapin(swp_entry_t swap, gfp_t gfp,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ struct vm_area_struct pvma;
+ struct page *page;
+ struct vm_fault vmf = {
+ .vma = &pvma,
+ };
+
+ shmem_pseudo_vma_init(&pvma, info, index);
+ page = swap_cluster_readahead(swap, gfp, &vmf);
+ shmem_pseudo_vma_destroy(&pvma);
+
+ if (!page)
+ return NULL;
+ return page_folio(page);
+}
+
+/*
+ * Make sure huge_gfp is always more limited than limit_gfp.
+ * Some of the flags set permissions, while others set limitations.
+ */
+static gfp_t limit_gfp_mask(gfp_t huge_gfp, gfp_t limit_gfp)
+{
+ gfp_t allowflags = __GFP_IO | __GFP_FS | __GFP_RECLAIM;
+ gfp_t denyflags = __GFP_NOWARN | __GFP_NORETRY;
+ gfp_t zoneflags = limit_gfp & GFP_ZONEMASK;
+ gfp_t result = huge_gfp & ~(allowflags | GFP_ZONEMASK);
+
+ /* Allow allocations only from the originally specified zones. */
+ result |= zoneflags;
+
+ /*
+ * Minimize the result gfp by taking the union with the deny flags,
+ * and the intersection of the allow flags.
+ */
+ result |= (limit_gfp & denyflags);
+ result |= (huge_gfp & limit_gfp) & allowflags;
+
+ return result;
+}
+
+static struct folio *shmem_alloc_hugefolio(gfp_t gfp,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ struct vm_area_struct pvma;
+ struct address_space *mapping = info->vfs_inode.i_mapping;
+ pgoff_t hindex;
+ struct folio *folio;
+
+ hindex = round_down(index, HPAGE_PMD_NR);
+ if (xa_find(&mapping->i_pages, &hindex, hindex + HPAGE_PMD_NR - 1,
+ XA_PRESENT))
+ return NULL;
+
+ shmem_pseudo_vma_init(&pvma, info, hindex);
+ folio = vma_alloc_folio(gfp, HPAGE_PMD_ORDER, &pvma, 0, true);
+ shmem_pseudo_vma_destroy(&pvma);
+ if (!folio)
+ count_vm_event(THP_FILE_FALLBACK);
+ return folio;
+}
+
+static struct folio *shmem_alloc_folio(gfp_t gfp,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ struct vm_area_struct pvma;
+ struct folio *folio;
+
+ shmem_pseudo_vma_init(&pvma, info, index);
+ folio = vma_alloc_folio(gfp, 0, &pvma, 0, false);
+ shmem_pseudo_vma_destroy(&pvma);
+
+ return folio;
+}
+
+static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode,
+ pgoff_t index, bool huge)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct folio *folio;
+ int nr;
+ int err = -ENOSPC;
+
+ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
+ huge = false;
+ nr = huge ? HPAGE_PMD_NR : 1;
+
+ if (!shmem_inode_acct_block(inode, nr))
+ goto failed;
+
+ if (huge)
+ folio = shmem_alloc_hugefolio(gfp, info, index);
+ else
+ folio = shmem_alloc_folio(gfp, info, index);
+ if (folio) {
+ __folio_set_locked(folio);
+ __folio_set_swapbacked(folio);
+ return folio;
+ }
+
+ err = -ENOMEM;
+ shmem_inode_unacct_blocks(inode, nr);
+failed:
+ return ERR_PTR(err);
+}
+
+/*
+ * When a page is moved from swapcache to shmem filecache (either by the
+ * usual swapin of shmem_get_folio_gfp(), or by the less common swapoff of
+ * shmem_unuse_inode()), it may have been read in earlier from swap, in
+ * ignorance of the mapping it belongs to. If that mapping has special
+ * constraints (like the gma500 GEM driver, which requires RAM below 4GB),
+ * we may need to copy to a suitable page before moving to filecache.
+ *
+ * In a future release, this may well be extended to respect cpuset and
+ * NUMA mempolicy, and applied also to anonymous pages in do_swap_page();
+ * but for now it is a simple matter of zone.
+ */
+static bool shmem_should_replace_folio(struct folio *folio, gfp_t gfp)
+{
+ return folio_zonenum(folio) > gfp_zone(gfp);
+}
+
+static int shmem_replace_folio(struct folio **foliop, gfp_t gfp,
+ struct shmem_inode_info *info, pgoff_t index)
+{
+ struct folio *old, *new;
+ struct address_space *swap_mapping;
+ swp_entry_t entry;
+ pgoff_t swap_index;
+ int error;
+
+ old = *foliop;
+ entry = folio_swap_entry(old);
+ swap_index = swp_offset(entry);
+ swap_mapping = swap_address_space(entry);
+
+ /*
+ * We have arrived here because our zones are constrained, so don't
+ * limit chance of success by further cpuset and node constraints.
+ */
+ gfp &= ~GFP_CONSTRAINT_MASK;
+ VM_BUG_ON_FOLIO(folio_test_large(old), old);
+ new = shmem_alloc_folio(gfp, info, index);
+ if (!new)
+ return -ENOMEM;
+
+ folio_get(new);
+ folio_copy(new, old);
+ flush_dcache_folio(new);
+
+ __folio_set_locked(new);
+ __folio_set_swapbacked(new);
+ folio_mark_uptodate(new);
+ folio_set_swap_entry(new, entry);
+ folio_set_swapcache(new);
+
+ /*
+ * Our caller will very soon move newpage out of swapcache, but it's
+ * a nice clean interface for us to replace oldpage by newpage there.
+ */
+ xa_lock_irq(&swap_mapping->i_pages);
+ error = shmem_replace_entry(swap_mapping, swap_index, old, new);
+ if (!error) {
+ mem_cgroup_migrate(old, new);
+ __lruvec_stat_mod_folio(new, NR_FILE_PAGES, 1);
+ __lruvec_stat_mod_folio(new, NR_SHMEM, 1);
+ __lruvec_stat_mod_folio(old, NR_FILE_PAGES, -1);
+ __lruvec_stat_mod_folio(old, NR_SHMEM, -1);
+ }
+ xa_unlock_irq(&swap_mapping->i_pages);
+
+ if (unlikely(error)) {
+ /*
+ * Is this possible? I think not, now that our callers check
+ * both PageSwapCache and page_private after getting page lock;
+ * but be defensive. Reverse old to newpage for clear and free.
+ */
+ old = new;
+ } else {
+ folio_add_lru(new);
+ *foliop = new;
+ }
+
+ folio_clear_swapcache(old);
+ old->private = NULL;
+
+ folio_unlock(old);
+ folio_put_refs(old, 2);
+ return error;
+}
+
+static void shmem_set_folio_swapin_error(struct inode *inode, pgoff_t index,
+ struct folio *folio, swp_entry_t swap)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ swp_entry_t swapin_error;
+ void *old;
+
+ swapin_error = make_swapin_error_entry(&folio->page);
+ old = xa_cmpxchg_irq(&mapping->i_pages, index,
+ swp_to_radix_entry(swap),
+ swp_to_radix_entry(swapin_error), 0);
+ if (old != swp_to_radix_entry(swap))
+ return;
+
+ folio_wait_writeback(folio);
+ delete_from_swap_cache(folio);
+ spin_lock_irq(&info->lock);
+ /*
+ * Don't treat swapin error folio as alloced. Otherwise inode->i_blocks won't
+ * be 0 when inode is released and thus trigger WARN_ON(inode->i_blocks) in
+ * shmem_evict_inode.
+ */
+ info->alloced--;
+ info->swapped--;
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+ swap_free(swap);
+}
+
+/*
+ * Swap in the folio pointed to by *foliop.
+ * Caller has to make sure that *foliop contains a valid swapped folio.
+ * Returns 0 and the folio in foliop if success. On failure, returns the
+ * error code and NULL in *foliop.
+ */
+static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
+ struct folio **foliop, enum sgp_type sgp,
+ gfp_t gfp, struct vm_area_struct *vma,
+ vm_fault_t *fault_type)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct mm_struct *charge_mm = vma ? vma->vm_mm : NULL;
+ struct folio *folio = NULL;
+ swp_entry_t swap;
+ int error;
+
+ VM_BUG_ON(!*foliop || !xa_is_value(*foliop));
+ swap = radix_to_swp_entry(*foliop);
+ *foliop = NULL;
+
+ if (is_swapin_error_entry(swap))
+ return -EIO;
+
+ /* Look it up and read it in.. */
+ folio = swap_cache_get_folio(swap, NULL, 0);
+ if (!folio) {
+ /* Or update major stats only when swapin succeeds?? */
+ if (fault_type) {
+ *fault_type |= VM_FAULT_MAJOR;
+ count_vm_event(PGMAJFAULT);
+ count_memcg_event_mm(charge_mm, PGMAJFAULT);
+ }
+ /* Here we actually start the io */
+ folio = shmem_swapin(swap, gfp, info, index);
+ if (!folio) {
+ error = -ENOMEM;
+ goto failed;
+ }
+ }
+
+ /* We have to do this with folio locked to prevent races */
+ folio_lock(folio);
+ if (!folio_test_swapcache(folio) ||
+ folio_swap_entry(folio).val != swap.val ||
+ !shmem_confirm_swap(mapping, index, swap)) {
+ error = -EEXIST;
+ goto unlock;
+ }
+ if (!folio_test_uptodate(folio)) {
+ error = -EIO;
+ goto failed;
+ }
+ folio_wait_writeback(folio);
+
+ /*
+ * Some architectures may have to restore extra metadata to the
+ * folio after reading from swap.
+ */
+ arch_swap_restore(swap, folio);
+
+ if (shmem_should_replace_folio(folio, gfp)) {
+ error = shmem_replace_folio(&folio, gfp, info, index);
+ if (error)
+ goto failed;
+ }
+
+ error = shmem_add_to_page_cache(folio, mapping, index,
+ swp_to_radix_entry(swap), gfp,
+ charge_mm);
+ if (error)
+ goto failed;
+
+ spin_lock_irq(&info->lock);
+ info->swapped--;
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+
+ if (sgp == SGP_WRITE)
+ folio_mark_accessed(folio);
+
+ delete_from_swap_cache(folio);
+ folio_mark_dirty(folio);
+ swap_free(swap);
+
+ *foliop = folio;
+ return 0;
+failed:
+ if (!shmem_confirm_swap(mapping, index, swap))
+ error = -EEXIST;
+ if (error == -EIO)
+ shmem_set_folio_swapin_error(inode, index, folio, swap);
+unlock:
+ if (folio) {
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+
+ return error;
+}
+
+/*
+ * shmem_get_folio_gfp - find page in cache, or get from swap, or allocate
+ *
+ * If we allocate a new one we do not mark it dirty. That's up to the
+ * vm. If we swap it in we mark it dirty since we also free the swap
+ * entry since a page cannot live in both the swap and page cache.
+ *
+ * vma, vmf, and fault_type are only supplied by shmem_fault:
+ * otherwise they are NULL.
+ */
+static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
+ struct folio **foliop, enum sgp_type sgp, gfp_t gfp,
+ struct vm_area_struct *vma, struct vm_fault *vmf,
+ vm_fault_t *fault_type)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct shmem_sb_info *sbinfo;
+ struct mm_struct *charge_mm;
+ struct folio *folio;
+ pgoff_t hindex = index;
+ gfp_t huge_gfp;
+ int error;
+ int once = 0;
+ int alloced = 0;
+
+ if (index > (MAX_LFS_FILESIZE >> PAGE_SHIFT))
+ return -EFBIG;
+repeat:
+ if (sgp <= SGP_CACHE &&
+ ((loff_t)index << PAGE_SHIFT) >= i_size_read(inode)) {
+ return -EINVAL;
+ }
+
+ sbinfo = SHMEM_SB(inode->i_sb);
+ charge_mm = vma ? vma->vm_mm : NULL;
+
+ folio = __filemap_get_folio(mapping, index, FGP_ENTRY | FGP_LOCK, 0);
+ if (folio && vma && userfaultfd_minor(vma)) {
+ if (!xa_is_value(folio)) {
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+ *fault_type = handle_userfault(vmf, VM_UFFD_MINOR);
+ return 0;
+ }
+
+ if (xa_is_value(folio)) {
+ error = shmem_swapin_folio(inode, index, &folio,
+ sgp, gfp, vma, fault_type);
+ if (error == -EEXIST)
+ goto repeat;
+
+ *foliop = folio;
+ return error;
+ }
+
+ if (folio) {
+ hindex = folio->index;
+ if (sgp == SGP_WRITE)
+ folio_mark_accessed(folio);
+ if (folio_test_uptodate(folio))
+ goto out;
+ /* fallocated folio */
+ if (sgp != SGP_READ)
+ goto clear;
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+
+ /*
+ * SGP_READ: succeed on hole, with NULL folio, letting caller zero.
+ * SGP_NOALLOC: fail on hole, with NULL folio, letting caller fail.
+ */
+ *foliop = NULL;
+ if (sgp == SGP_READ)
+ return 0;
+ if (sgp == SGP_NOALLOC)
+ return -ENOENT;
+
+ /*
+ * Fast cache lookup and swap lookup did not find it: allocate.
+ */
+
+ if (vma && userfaultfd_missing(vma)) {
+ *fault_type = handle_userfault(vmf, VM_UFFD_MISSING);
+ return 0;
+ }
+
+ if (!shmem_is_huge(vma, inode, index, false))
+ goto alloc_nohuge;
+
+ huge_gfp = vma_thp_gfp_mask(vma);
+ huge_gfp = limit_gfp_mask(huge_gfp, gfp);
+ folio = shmem_alloc_and_acct_folio(huge_gfp, inode, index, true);
+ if (IS_ERR(folio)) {
+alloc_nohuge:
+ folio = shmem_alloc_and_acct_folio(gfp, inode, index, false);
+ }
+ if (IS_ERR(folio)) {
+ int retry = 5;
+
+ error = PTR_ERR(folio);
+ folio = NULL;
+ if (error != -ENOSPC)
+ goto unlock;
+ /*
+ * Try to reclaim some space by splitting a large folio
+ * beyond i_size on the filesystem.
+ */
+ while (retry--) {
+ int ret;
+
+ ret = shmem_unused_huge_shrink(sbinfo, NULL, 1);
+ if (ret == SHRINK_STOP)
+ break;
+ if (ret)
+ goto alloc_nohuge;
+ }
+ goto unlock;
+ }
+
+ hindex = round_down(index, folio_nr_pages(folio));
+
+ if (sgp == SGP_WRITE)
+ __folio_set_referenced(folio);
+
+ error = shmem_add_to_page_cache(folio, mapping, hindex,
+ NULL, gfp & GFP_RECLAIM_MASK,
+ charge_mm);
+ if (error)
+ goto unacct;
+ folio_add_lru(folio);
+
+ spin_lock_irq(&info->lock);
+ info->alloced += folio_nr_pages(folio);
+ inode->i_blocks += (blkcnt_t)BLOCKS_PER_PAGE << folio_order(folio);
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+ alloced = true;
+
+ if (folio_test_pmd_mappable(folio) &&
+ DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE) <
+ folio_next_index(folio) - 1) {
+ /*
+ * Part of the large folio is beyond i_size: subject
+ * to shrink under memory pressure.
+ */
+ spin_lock(&sbinfo->shrinklist_lock);
+ /*
+ * _careful to defend against unlocked access to
+ * ->shrink_list in shmem_unused_huge_shrink()
+ */
+ if (list_empty_careful(&info->shrinklist)) {
+ list_add_tail(&info->shrinklist,
+ &sbinfo->shrinklist);
+ sbinfo->shrinklist_len++;
+ }
+ spin_unlock(&sbinfo->shrinklist_lock);
+ }
+
+ /*
+ * Let SGP_FALLOC use the SGP_WRITE optimization on a new folio.
+ */
+ if (sgp == SGP_FALLOC)
+ sgp = SGP_WRITE;
+clear:
+ /*
+ * Let SGP_WRITE caller clear ends if write does not fill folio;
+ * but SGP_FALLOC on a folio fallocated earlier must initialize
+ * it now, lest undo on failure cancel our earlier guarantee.
+ */
+ if (sgp != SGP_WRITE && !folio_test_uptodate(folio)) {
+ long i, n = folio_nr_pages(folio);
+
+ for (i = 0; i < n; i++)
+ clear_highpage(folio_page(folio, i));
+ flush_dcache_folio(folio);
+ folio_mark_uptodate(folio);
+ }
+
+ /* Perhaps the file has been truncated since we checked */
+ if (sgp <= SGP_CACHE &&
+ ((loff_t)index << PAGE_SHIFT) >= i_size_read(inode)) {
+ if (alloced) {
+ folio_clear_dirty(folio);
+ filemap_remove_folio(folio);
+ spin_lock_irq(&info->lock);
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+ }
+ error = -EINVAL;
+ goto unlock;
+ }
+out:
+ *foliop = folio;
+ return 0;
+
+ /*
+ * Error recovery.
+ */
+unacct:
+ shmem_inode_unacct_blocks(inode, folio_nr_pages(folio));
+
+ if (folio_test_large(folio)) {
+ folio_unlock(folio);
+ folio_put(folio);
+ goto alloc_nohuge;
+ }
+unlock:
+ if (folio) {
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+ if (error == -ENOSPC && !once++) {
+ spin_lock_irq(&info->lock);
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+ goto repeat;
+ }
+ if (error == -EEXIST)
+ goto repeat;
+ return error;
+}
+
+int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop,
+ enum sgp_type sgp)
+{
+ return shmem_get_folio_gfp(inode, index, foliop, sgp,
+ mapping_gfp_mask(inode->i_mapping), NULL, NULL, NULL);
+}
+
+/*
+ * This is like autoremove_wake_function, but it removes the wait queue
+ * entry unconditionally - even if something else had already woken the
+ * target.
+ */
+static int synchronous_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key)
+{
+ int ret = default_wake_function(wait, mode, sync, key);
+ list_del_init(&wait->entry);
+ return ret;
+}
+
+static vm_fault_t shmem_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct inode *inode = file_inode(vma->vm_file);
+ gfp_t gfp = mapping_gfp_mask(inode->i_mapping);
+ struct folio *folio = NULL;
+ int err;
+ vm_fault_t ret = VM_FAULT_LOCKED;
+
+ /*
+ * Trinity finds that probing a hole which tmpfs is punching can
+ * prevent the hole-punch from ever completing: which in turn
+ * locks writers out with its hold on i_rwsem. So refrain from
+ * faulting pages into the hole while it's being punched. Although
+ * shmem_undo_range() does remove the additions, it may be unable to
+ * keep up, as each new page needs its own unmap_mapping_range() call,
+ * and the i_mmap tree grows ever slower to scan if new vmas are added.
+ *
+ * It does not matter if we sometimes reach this check just before the
+ * hole-punch begins, so that one fault then races with the punch:
+ * we just need to make racing faults a rare case.
+ *
+ * The implementation below would be much simpler if we just used a
+ * standard mutex or completion: but we cannot take i_rwsem in fault,
+ * and bloating every shmem inode for this unlikely case would be sad.
+ */
+ if (unlikely(inode->i_private)) {
+ struct shmem_falloc *shmem_falloc;
+
+ spin_lock(&inode->i_lock);
+ shmem_falloc = inode->i_private;
+ if (shmem_falloc &&
+ shmem_falloc->waitq &&
+ vmf->pgoff >= shmem_falloc->start &&
+ vmf->pgoff < shmem_falloc->next) {
+ struct file *fpin;
+ wait_queue_head_t *shmem_falloc_waitq;
+ DEFINE_WAIT_FUNC(shmem_fault_wait, synchronous_wake_function);
+
+ ret = VM_FAULT_NOPAGE;
+ fpin = maybe_unlock_mmap_for_io(vmf, NULL);
+ if (fpin)
+ ret = VM_FAULT_RETRY;
+
+ shmem_falloc_waitq = shmem_falloc->waitq;
+ prepare_to_wait(shmem_falloc_waitq, &shmem_fault_wait,
+ TASK_UNINTERRUPTIBLE);
+ spin_unlock(&inode->i_lock);
+ schedule();
+
+ /*
+ * shmem_falloc_waitq points into the shmem_fallocate()
+ * stack of the hole-punching task: shmem_falloc_waitq
+ * is usually invalid by the time we reach here, but
+ * finish_wait() does not dereference it in that case;
+ * though i_lock needed lest racing with wake_up_all().
+ */
+ spin_lock(&inode->i_lock);
+ finish_wait(shmem_falloc_waitq, &shmem_fault_wait);
+ spin_unlock(&inode->i_lock);
+
+ if (fpin)
+ fput(fpin);
+ return ret;
+ }
+ spin_unlock(&inode->i_lock);
+ }
+
+ err = shmem_get_folio_gfp(inode, vmf->pgoff, &folio, SGP_CACHE,
+ gfp, vma, vmf, &ret);
+ if (err)
+ return vmf_error(err);
+ if (folio)
+ vmf->page = folio_file_page(folio, vmf->pgoff);
+ return ret;
+}
+
+unsigned long shmem_get_unmapped_area(struct file *file,
+ unsigned long uaddr, unsigned long len,
+ unsigned long pgoff, unsigned long flags)
+{
+ unsigned long (*get_area)(struct file *,
+ unsigned long, unsigned long, unsigned long, unsigned long);
+ unsigned long addr;
+ unsigned long offset;
+ unsigned long inflated_len;
+ unsigned long inflated_addr;
+ unsigned long inflated_offset;
+
+ if (len > TASK_SIZE)
+ return -ENOMEM;
+
+ get_area = current->mm->get_unmapped_area;
+ addr = get_area(file, uaddr, len, pgoff, flags);
+
+ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
+ return addr;
+ if (IS_ERR_VALUE(addr))
+ return addr;
+ if (addr & ~PAGE_MASK)
+ return addr;
+ if (addr > TASK_SIZE - len)
+ return addr;
+
+ if (shmem_huge == SHMEM_HUGE_DENY)
+ return addr;
+ if (len < HPAGE_PMD_SIZE)
+ return addr;
+ if (flags & MAP_FIXED)
+ return addr;
+ /*
+ * Our priority is to support MAP_SHARED mapped hugely;
+ * and support MAP_PRIVATE mapped hugely too, until it is COWed.
+ * But if caller specified an address hint and we allocated area there
+ * successfully, respect that as before.
+ */
+ if (uaddr == addr)
+ return addr;
+
+ if (shmem_huge != SHMEM_HUGE_FORCE) {
+ struct super_block *sb;
+
+ if (file) {
+ VM_BUG_ON(file->f_op != &shmem_file_operations);
+ sb = file_inode(file)->i_sb;
+ } else {
+ /*
+ * Called directly from mm/mmap.c, or drivers/char/mem.c
+ * for "/dev/zero", to create a shared anonymous object.
+ */
+ if (IS_ERR(shm_mnt))
+ return addr;
+ sb = shm_mnt->mnt_sb;
+ }
+ if (SHMEM_SB(sb)->huge == SHMEM_HUGE_NEVER)
+ return addr;
+ }
+
+ offset = (pgoff << PAGE_SHIFT) & (HPAGE_PMD_SIZE-1);
+ if (offset && offset + len < 2 * HPAGE_PMD_SIZE)
+ return addr;
+ if ((addr & (HPAGE_PMD_SIZE-1)) == offset)
+ return addr;
+
+ inflated_len = len + HPAGE_PMD_SIZE - PAGE_SIZE;
+ if (inflated_len > TASK_SIZE)
+ return addr;
+ if (inflated_len < len)
+ return addr;
+
+ inflated_addr = get_area(NULL, uaddr, inflated_len, 0, flags);
+ if (IS_ERR_VALUE(inflated_addr))
+ return addr;
+ if (inflated_addr & ~PAGE_MASK)
+ return addr;
+
+ inflated_offset = inflated_addr & (HPAGE_PMD_SIZE-1);
+ inflated_addr += offset - inflated_offset;
+ if (inflated_offset > offset)
+ inflated_addr += HPAGE_PMD_SIZE;
+
+ if (inflated_addr > TASK_SIZE - len)
+ return addr;
+ return inflated_addr;
+}
+
+#ifdef CONFIG_NUMA
+static int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *mpol)
+{
+ struct inode *inode = file_inode(vma->vm_file);
+ return mpol_set_shared_policy(&SHMEM_I(inode)->policy, vma, mpol);
+}
+
+static struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
+ unsigned long addr)
+{
+ struct inode *inode = file_inode(vma->vm_file);
+ pgoff_t index;
+
+ index = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+ return mpol_shared_policy_lookup(&SHMEM_I(inode)->policy, index);
+}
+#endif
+
+int shmem_lock(struct file *file, int lock, struct ucounts *ucounts)
+{
+ struct inode *inode = file_inode(file);
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ int retval = -ENOMEM;
+
+ /*
+ * What serializes the accesses to info->flags?
+ * ipc_lock_object() when called from shmctl_do_lock(),
+ * no serialization needed when called from shm_destroy().
+ */
+ if (lock && !(info->flags & VM_LOCKED)) {
+ if (!user_shm_lock(inode->i_size, ucounts))
+ goto out_nomem;
+ info->flags |= VM_LOCKED;
+ mapping_set_unevictable(file->f_mapping);
+ }
+ if (!lock && (info->flags & VM_LOCKED) && ucounts) {
+ user_shm_unlock(inode->i_size, ucounts);
+ info->flags &= ~VM_LOCKED;
+ mapping_clear_unevictable(file->f_mapping);
+ }
+ retval = 0;
+
+out_nomem:
+ return retval;
+}
+
+static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct shmem_inode_info *info = SHMEM_I(file_inode(file));
+ int ret;
+
+ ret = seal_check_future_write(info->seals, vma);
+ if (ret)
+ return ret;
+
+ /* arm64 - allow memory tagging on RAM-based files */
+ vma->vm_flags |= VM_MTE_ALLOWED;
+
+ file_accessed(file);
+ vma->vm_ops = &shmem_vm_ops;
+ return 0;
+}
+
+#ifdef CONFIG_TMPFS_XATTR
+static int shmem_initxattrs(struct inode *, const struct xattr *, void *);
+
+/*
+ * chattr's fsflags are unrelated to extended attributes,
+ * but tmpfs has chosen to enable them under the same config option.
+ */
+static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags)
+{
+ unsigned int i_flags = 0;
+
+ if (fsflags & FS_NOATIME_FL)
+ i_flags |= S_NOATIME;
+ if (fsflags & FS_APPEND_FL)
+ i_flags |= S_APPEND;
+ if (fsflags & FS_IMMUTABLE_FL)
+ i_flags |= S_IMMUTABLE;
+ /*
+ * But FS_NODUMP_FL does not require any action in i_flags.
+ */
+ inode_set_flags(inode, i_flags, S_NOATIME | S_APPEND | S_IMMUTABLE);
+}
+#else
+static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags)
+{
+}
+#define shmem_initxattrs NULL
+#endif
+
+static struct inode *shmem_get_inode(struct super_block *sb, struct inode *dir,
+ umode_t mode, dev_t dev, unsigned long flags)
+{
+ struct inode *inode;
+ struct shmem_inode_info *info;
+ struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+ ino_t ino;
+
+ if (shmem_reserve_inode(sb, &ino))
+ return NULL;
+
+ inode = new_inode(sb);
+ if (inode) {
+ inode->i_ino = ino;
+ inode_init_owner(&init_user_ns, inode, dir, mode);
+ inode->i_blocks = 0;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+ inode->i_generation = get_random_u32();
+ info = SHMEM_I(inode);
+ memset(info, 0, (char *)inode - (char *)info);
+ spin_lock_init(&info->lock);
+ atomic_set(&info->stop_eviction, 0);
+ info->seals = F_SEAL_SEAL;
+ info->flags = flags & VM_NORESERVE;
+ info->i_crtime = inode->i_mtime;
+ info->fsflags = (dir == NULL) ? 0 :
+ SHMEM_I(dir)->fsflags & SHMEM_FL_INHERITED;
+ if (info->fsflags)
+ shmem_set_inode_flags(inode, info->fsflags);
+ INIT_LIST_HEAD(&info->shrinklist);
+ INIT_LIST_HEAD(&info->swaplist);
+ simple_xattrs_init(&info->xattrs);
+ cache_no_acl(inode);
+ mapping_set_large_folios(inode->i_mapping);
+
+ switch (mode & S_IFMT) {
+ default:
+ inode->i_op = &shmem_special_inode_operations;
+ init_special_inode(inode, mode, dev);
+ break;
+ case S_IFREG:
+ inode->i_mapping->a_ops = &shmem_aops;
+ inode->i_op = &shmem_inode_operations;
+ inode->i_fop = &shmem_file_operations;
+ mpol_shared_policy_init(&info->policy,
+ shmem_get_sbmpol(sbinfo));
+ break;
+ case S_IFDIR:
+ inc_nlink(inode);
+ /* Some things misbehave if size == 0 on a directory */
+ inode->i_size = 2 * BOGO_DIRENT_SIZE;
+ inode->i_op = &shmem_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ break;
+ case S_IFLNK:
+ /*
+ * Must not load anything in the rbtree,
+ * mpol_free_shared_policy will not be called.
+ */
+ mpol_shared_policy_init(&info->policy, NULL);
+ break;
+ }
+
+ lockdep_annotate_inode_mutex_key(inode);
+ } else
+ shmem_free_inode(sb);
+ return inode;
+}
+
+#ifdef CONFIG_USERFAULTFD
+int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
+ pmd_t *dst_pmd,
+ struct vm_area_struct *dst_vma,
+ unsigned long dst_addr,
+ unsigned long src_addr,
+ bool zeropage, bool wp_copy,
+ struct page **pagep)
+{
+ struct inode *inode = file_inode(dst_vma->vm_file);
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct address_space *mapping = inode->i_mapping;
+ gfp_t gfp = mapping_gfp_mask(mapping);
+ pgoff_t pgoff = linear_page_index(dst_vma, dst_addr);
+ void *page_kaddr;
+ struct folio *folio;
+ int ret;
+ pgoff_t max_off;
+
+ if (!shmem_inode_acct_block(inode, 1)) {
+ /*
+ * We may have got a page, returned -ENOENT triggering a retry,
+ * and now we find ourselves with -ENOMEM. Release the page, to
+ * avoid a BUG_ON in our caller.
+ */
+ if (unlikely(*pagep)) {
+ put_page(*pagep);
+ *pagep = NULL;
+ }
+ return -ENOMEM;
+ }
+
+ if (!*pagep) {
+ ret = -ENOMEM;
+ folio = shmem_alloc_folio(gfp, info, pgoff);
+ if (!folio)
+ goto out_unacct_blocks;
+
+ if (!zeropage) { /* COPY */
+ page_kaddr = kmap_local_folio(folio, 0);
+ /*
+ * The read mmap_lock is held here. Despite the
+ * mmap_lock being read recursive a deadlock is still
+ * possible if a writer has taken a lock. For example:
+ *
+ * process A thread 1 takes read lock on own mmap_lock
+ * process A thread 2 calls mmap, blocks taking write lock
+ * process B thread 1 takes page fault, read lock on own mmap lock
+ * process B thread 2 calls mmap, blocks taking write lock
+ * process A thread 1 blocks taking read lock on process B
+ * process B thread 1 blocks taking read lock on process A
+ *
+ * Disable page faults to prevent potential deadlock
+ * and retry the copy outside the mmap_lock.
+ */
+ pagefault_disable();
+ ret = copy_from_user(page_kaddr,
+ (const void __user *)src_addr,
+ PAGE_SIZE);
+ pagefault_enable();
+ kunmap_local(page_kaddr);
+
+ /* fallback to copy_from_user outside mmap_lock */
+ if (unlikely(ret)) {
+ *pagep = &folio->page;
+ ret = -ENOENT;
+ /* don't free the page */
+ goto out_unacct_blocks;
+ }
+
+ flush_dcache_folio(folio);
+ } else { /* ZEROPAGE */
+ clear_user_highpage(&folio->page, dst_addr);
+ }
+ } else {
+ folio = page_folio(*pagep);
+ VM_BUG_ON_FOLIO(folio_test_large(folio), folio);
+ *pagep = NULL;
+ }
+
+ VM_BUG_ON(folio_test_locked(folio));
+ VM_BUG_ON(folio_test_swapbacked(folio));
+ __folio_set_locked(folio);
+ __folio_set_swapbacked(folio);
+ __folio_mark_uptodate(folio);
+
+ ret = -EFAULT;
+ max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+ if (unlikely(pgoff >= max_off))
+ goto out_release;
+
+ ret = shmem_add_to_page_cache(folio, mapping, pgoff, NULL,
+ gfp & GFP_RECLAIM_MASK, dst_mm);
+ if (ret)
+ goto out_release;
+
+ ret = mfill_atomic_install_pte(dst_mm, dst_pmd, dst_vma, dst_addr,
+ &folio->page, true, wp_copy);
+ if (ret)
+ goto out_delete_from_cache;
+
+ spin_lock_irq(&info->lock);
+ info->alloced++;
+ inode->i_blocks += BLOCKS_PER_PAGE;
+ shmem_recalc_inode(inode);
+ spin_unlock_irq(&info->lock);
+
+ folio_unlock(folio);
+ return 0;
+out_delete_from_cache:
+ filemap_remove_folio(folio);
+out_release:
+ folio_unlock(folio);
+ folio_put(folio);
+out_unacct_blocks:
+ shmem_inode_unacct_blocks(inode, 1);
+ return ret;
+}
+#endif /* CONFIG_USERFAULTFD */
+
+#ifdef CONFIG_TMPFS
+static const struct inode_operations shmem_symlink_inode_operations;
+static const struct inode_operations shmem_short_symlink_operations;
+
+static int
+shmem_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len,
+ struct page **pagep, void **fsdata)
+{
+ struct inode *inode = mapping->host;
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ pgoff_t index = pos >> PAGE_SHIFT;
+ struct folio *folio;
+ int ret = 0;
+
+ /* i_rwsem is held by caller */
+ if (unlikely(info->seals & (F_SEAL_GROW |
+ F_SEAL_WRITE | F_SEAL_FUTURE_WRITE))) {
+ if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE))
+ return -EPERM;
+ if ((info->seals & F_SEAL_GROW) && pos + len > inode->i_size)
+ return -EPERM;
+ }
+
+ ret = shmem_get_folio(inode, index, &folio, SGP_WRITE);
+
+ if (ret)
+ return ret;
+
+ *pagep = folio_file_page(folio, index);
+ if (PageHWPoison(*pagep)) {
+ folio_unlock(folio);
+ folio_put(folio);
+ *pagep = NULL;
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int
+shmem_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{
+ struct inode *inode = mapping->host;
+
+ if (pos + copied > inode->i_size)
+ i_size_write(inode, pos + copied);
+
+ if (!PageUptodate(page)) {
+ struct page *head = compound_head(page);
+ if (PageTransCompound(page)) {
+ int i;
+
+ for (i = 0; i < HPAGE_PMD_NR; i++) {
+ if (head + i == page)
+ continue;
+ clear_highpage(head + i);
+ flush_dcache_page(head + i);
+ }
+ }
+ if (copied < PAGE_SIZE) {
+ unsigned from = pos & (PAGE_SIZE - 1);
+ zero_user_segments(page, 0, from,
+ from + copied, PAGE_SIZE);
+ }
+ SetPageUptodate(head);
+ }
+ set_page_dirty(page);
+ unlock_page(page);
+ put_page(page);
+
+ return copied;
+}
+
+static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file_inode(file);
+ struct address_space *mapping = inode->i_mapping;
+ pgoff_t index;
+ unsigned long offset;
+ int error = 0;
+ ssize_t retval = 0;
+ loff_t *ppos = &iocb->ki_pos;
+
+ index = *ppos >> PAGE_SHIFT;
+ offset = *ppos & ~PAGE_MASK;
+
+ for (;;) {
+ struct folio *folio = NULL;
+ struct page *page = NULL;
+ pgoff_t end_index;
+ unsigned long nr, ret;
+ loff_t i_size = i_size_read(inode);
+
+ end_index = i_size >> PAGE_SHIFT;
+ if (index > end_index)
+ break;
+ if (index == end_index) {
+ nr = i_size & ~PAGE_MASK;
+ if (nr <= offset)
+ break;
+ }
+
+ error = shmem_get_folio(inode, index, &folio, SGP_READ);
+ if (error) {
+ if (error == -EINVAL)
+ error = 0;
+ break;
+ }
+ if (folio) {
+ folio_unlock(folio);
+
+ page = folio_file_page(folio, index);
+ if (PageHWPoison(page)) {
+ folio_put(folio);
+ error = -EIO;
+ break;
+ }
+ }
+
+ /*
+ * We must evaluate after, since reads (unlike writes)
+ * are called without i_rwsem protection against truncate
+ */
+ nr = PAGE_SIZE;
+ i_size = i_size_read(inode);
+ end_index = i_size >> PAGE_SHIFT;
+ if (index == end_index) {
+ nr = i_size & ~PAGE_MASK;
+ if (nr <= offset) {
+ if (folio)
+ folio_put(folio);
+ break;
+ }
+ }
+ nr -= offset;
+
+ if (folio) {
+ /*
+ * If users can be writing to this page using arbitrary
+ * virtual addresses, take care about potential aliasing
+ * before reading the page on the kernel side.
+ */
+ if (mapping_writably_mapped(mapping))
+ flush_dcache_page(page);
+ /*
+ * Mark the page accessed if we read the beginning.
+ */
+ if (!offset)
+ folio_mark_accessed(folio);
+ /*
+ * Ok, we have the page, and it's up-to-date, so
+ * now we can copy it to user space...
+ */
+ ret = copy_page_to_iter(page, offset, nr, to);
+ folio_put(folio);
+
+ } else if (user_backed_iter(to)) {
+ /*
+ * Copy to user tends to be so well optimized, but
+ * clear_user() not so much, that it is noticeably
+ * faster to copy the zero page instead of clearing.
+ */
+ ret = copy_page_to_iter(ZERO_PAGE(0), offset, nr, to);
+ } else {
+ /*
+ * But submitting the same page twice in a row to
+ * splice() - or others? - can result in confusion:
+ * so don't attempt that optimization on pipes etc.
+ */
+ ret = iov_iter_zero(nr, to);
+ }
+
+ retval += ret;
+ offset += ret;
+ index += offset >> PAGE_SHIFT;
+ offset &= ~PAGE_MASK;
+
+ if (!iov_iter_count(to))
+ break;
+ if (ret < nr) {
+ error = -EFAULT;
+ break;
+ }
+ cond_resched();
+ }
+
+ *ppos = ((loff_t) index << PAGE_SHIFT) + offset;
+ file_accessed(file);
+ return retval ? retval : error;
+}
+
+static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence)
+{
+ struct address_space *mapping = file->f_mapping;
+ struct inode *inode = mapping->host;
+
+ if (whence != SEEK_DATA && whence != SEEK_HOLE)
+ return generic_file_llseek_size(file, offset, whence,
+ MAX_LFS_FILESIZE, i_size_read(inode));
+ if (offset < 0)
+ return -ENXIO;
+
+ inode_lock(inode);
+ /* We're holding i_rwsem so we can access i_size directly */
+ offset = mapping_seek_hole_data(mapping, offset, inode->i_size, whence);
+ if (offset >= 0)
+ offset = vfs_setpos(file, offset, MAX_LFS_FILESIZE);
+ inode_unlock(inode);
+ return offset;
+}
+
+static long shmem_fallocate(struct file *file, int mode, loff_t offset,
+ loff_t len)
+{
+ struct inode *inode = file_inode(file);
+ struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ struct shmem_falloc shmem_falloc;
+ pgoff_t start, index, end, undo_fallocend;
+ int error;
+
+ if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+ return -EOPNOTSUPP;
+
+ inode_lock(inode);
+
+ if (mode & FALLOC_FL_PUNCH_HOLE) {
+ struct address_space *mapping = file->f_mapping;
+ loff_t unmap_start = round_up(offset, PAGE_SIZE);
+ loff_t unmap_end = round_down(offset + len, PAGE_SIZE) - 1;
+ DECLARE_WAIT_QUEUE_HEAD_ONSTACK(shmem_falloc_waitq);
+
+ /* protected by i_rwsem */
+ if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) {
+ error = -EPERM;
+ goto out;
+ }
+
+ shmem_falloc.waitq = &shmem_falloc_waitq;
+ shmem_falloc.start = (u64)unmap_start >> PAGE_SHIFT;
+ shmem_falloc.next = (unmap_end + 1) >> PAGE_SHIFT;
+ spin_lock(&inode->i_lock);
+ inode->i_private = &shmem_falloc;
+ spin_unlock(&inode->i_lock);
+
+ if ((u64)unmap_end > (u64)unmap_start)
+ unmap_mapping_range(mapping, unmap_start,
+ 1 + unmap_end - unmap_start, 0);
+ shmem_truncate_range(inode, offset, offset + len - 1);
+ /* No need to unmap again: hole-punching leaves COWed pages */
+
+ spin_lock(&inode->i_lock);
+ inode->i_private = NULL;
+ wake_up_all(&shmem_falloc_waitq);
+ WARN_ON_ONCE(!list_empty(&shmem_falloc_waitq.head));
+ spin_unlock(&inode->i_lock);
+ error = 0;
+ goto out;
+ }
+
+ /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */
+ error = inode_newsize_ok(inode, offset + len);
+ if (error)
+ goto out;
+
+ if ((info->seals & F_SEAL_GROW) && offset + len > inode->i_size) {
+ error = -EPERM;
+ goto out;
+ }
+
+ start = offset >> PAGE_SHIFT;
+ end = (offset + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ /* Try to avoid a swapstorm if len is impossible to satisfy */
+ if (sbinfo->max_blocks && end - start > sbinfo->max_blocks) {
+ error = -ENOSPC;
+ goto out;
+ }
+
+ shmem_falloc.waitq = NULL;
+ shmem_falloc.start = start;
+ shmem_falloc.next = start;
+ shmem_falloc.nr_falloced = 0;
+ shmem_falloc.nr_unswapped = 0;
+ spin_lock(&inode->i_lock);
+ inode->i_private = &shmem_falloc;
+ spin_unlock(&inode->i_lock);
+
+ /*
+ * info->fallocend is only relevant when huge pages might be
+ * involved: to prevent split_huge_page() freeing fallocated
+ * pages when FALLOC_FL_KEEP_SIZE committed beyond i_size.
+ */
+ undo_fallocend = info->fallocend;
+ if (info->fallocend < end)
+ info->fallocend = end;
+
+ for (index = start; index < end; ) {
+ struct folio *folio;
+
+ /*
+ * Good, the fallocate(2) manpage permits EINTR: we may have
+ * been interrupted because we are using up too much memory.
+ */
+ if (signal_pending(current))
+ error = -EINTR;
+ else if (shmem_falloc.nr_unswapped > shmem_falloc.nr_falloced)
+ error = -ENOMEM;
+ else
+ error = shmem_get_folio(inode, index, &folio,
+ SGP_FALLOC);
+ if (error) {
+ info->fallocend = undo_fallocend;
+ /* Remove the !uptodate folios we added */
+ if (index > start) {
+ shmem_undo_range(inode,
+ (loff_t)start << PAGE_SHIFT,
+ ((loff_t)index << PAGE_SHIFT) - 1, true);
+ }
+ goto undone;
+ }
+
+ /*
+ * Here is a more important optimization than it appears:
+ * a second SGP_FALLOC on the same large folio will clear it,
+ * making it uptodate and un-undoable if we fail later.
+ */
+ index = folio_next_index(folio);
+ /* Beware 32-bit wraparound */
+ if (!index)
+ index--;
+
+ /*
+ * Inform shmem_writepage() how far we have reached.
+ * No need for lock or barrier: we have the page lock.
+ */
+ if (!folio_test_uptodate(folio))
+ shmem_falloc.nr_falloced += index - shmem_falloc.next;
+ shmem_falloc.next = index;
+
+ /*
+ * If !uptodate, leave it that way so that freeable folios
+ * can be recognized if we need to rollback on error later.
+ * But mark it dirty so that memory pressure will swap rather
+ * than free the folios we are allocating (and SGP_CACHE folios
+ * might still be clean: we now need to mark those dirty too).
+ */
+ folio_mark_dirty(folio);
+ folio_unlock(folio);
+ folio_put(folio);
+ cond_resched();
+ }
+
+ if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size)
+ i_size_write(inode, offset + len);
+undone:
+ spin_lock(&inode->i_lock);
+ inode->i_private = NULL;
+ spin_unlock(&inode->i_lock);
+out:
+ if (!error)
+ file_modified(file);
+ inode_unlock(inode);
+ return error;
+}
+
+static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct shmem_sb_info *sbinfo = SHMEM_SB(dentry->d_sb);
+
+ buf->f_type = TMPFS_MAGIC;
+ buf->f_bsize = PAGE_SIZE;
+ buf->f_namelen = NAME_MAX;
+ if (sbinfo->max_blocks) {
+ buf->f_blocks = sbinfo->max_blocks;
+ buf->f_bavail =
+ buf->f_bfree = sbinfo->max_blocks -
+ percpu_counter_sum(&sbinfo->used_blocks);
+ }
+ if (sbinfo->max_inodes) {
+ buf->f_files = sbinfo->max_inodes;
+ buf->f_ffree = sbinfo->free_inodes;
+ }
+ /* else leave those fields 0 like simple_statfs */
+
+ buf->f_fsid = uuid_to_fsid(dentry->d_sb->s_uuid.b);
+
+ return 0;
+}
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+static int
+shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, dev_t dev)
+{
+ struct inode *inode;
+ int error = -ENOSPC;
+
+ inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE);
+ if (inode) {
+ error = simple_acl_create(dir, inode);
+ if (error)
+ goto out_iput;
+ error = security_inode_init_security(inode, dir,
+ &dentry->d_name,
+ shmem_initxattrs, NULL);
+ if (error && error != -EOPNOTSUPP)
+ goto out_iput;
+
+ error = 0;
+ dir->i_size += BOGO_DIRENT_SIZE;
+ dir->i_ctime = dir->i_mtime = current_time(dir);
+ inode_inc_iversion(dir);
+ d_instantiate(dentry, inode);
+ dget(dentry); /* Extra count - pin the dentry in core */
+ }
+ return error;
+out_iput:
+ iput(inode);
+ return error;
+}
+
+static int
+shmem_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+ struct file *file, umode_t mode)
+{
+ struct inode *inode;
+ int error = -ENOSPC;
+
+ inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE);
+ if (inode) {
+ error = security_inode_init_security(inode, dir,
+ NULL,
+ shmem_initxattrs, NULL);
+ if (error && error != -EOPNOTSUPP)
+ goto out_iput;
+ error = simple_acl_create(dir, inode);
+ if (error)
+ goto out_iput;
+ d_tmpfile(file, inode);
+ }
+ return finish_open_simple(file, error);
+out_iput:
+ iput(inode);
+ return error;
+}
+
+static int shmem_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
+{
+ int error;
+
+ if ((error = shmem_mknod(&init_user_ns, dir, dentry,
+ mode | S_IFDIR, 0)))
+ return error;
+ inc_nlink(dir);
+ return 0;
+}
+
+static int shmem_create(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
+{
+ return shmem_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
+}
+
+/*
+ * Link a file..
+ */
+static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = d_inode(old_dentry);
+ int ret = 0;
+
+ /*
+ * No ordinary (disk based) filesystem counts links as inodes;
+ * but each new link needs a new dentry, pinning lowmem, and
+ * tmpfs dentries cannot be pruned until they are unlinked.
+ * But if an O_TMPFILE file is linked into the tmpfs, the
+ * first link must skip that, to get the accounting right.
+ */
+ if (inode->i_nlink) {
+ ret = shmem_reserve_inode(inode->i_sb, NULL);
+ if (ret)
+ goto out;
+ }
+
+ dir->i_size += BOGO_DIRENT_SIZE;
+ inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
+ inode_inc_iversion(dir);
+ inc_nlink(inode);
+ ihold(inode); /* New dentry reference */
+ dget(dentry); /* Extra pinning count for the created dentry */
+ d_instantiate(dentry, inode);
+out:
+ return ret;
+}
+
+static int shmem_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = d_inode(dentry);
+
+ if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode))
+ shmem_free_inode(inode->i_sb);
+
+ dir->i_size -= BOGO_DIRENT_SIZE;
+ inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
+ inode_inc_iversion(dir);
+ drop_nlink(inode);
+ dput(dentry); /* Undo the count from "create" - this does all the work */
+ return 0;
+}
+
+static int shmem_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ if (!simple_empty(dentry))
+ return -ENOTEMPTY;
+
+ drop_nlink(d_inode(dentry));
+ drop_nlink(dir);
+ return shmem_unlink(dir, dentry);
+}
+
+static int shmem_whiteout(struct user_namespace *mnt_userns,
+ struct inode *old_dir, struct dentry *old_dentry)
+{
+ struct dentry *whiteout;
+ int error;
+
+ whiteout = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
+ if (!whiteout)
+ return -ENOMEM;
+
+ error = shmem_mknod(&init_user_ns, old_dir, whiteout,
+ S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV);
+ dput(whiteout);
+ if (error)
+ return error;
+
+ /*
+ * Cheat and hash the whiteout while the old dentry is still in
+ * place, instead of playing games with FS_RENAME_DOES_D_MOVE.
+ *
+ * d_lookup() will consistently find one of them at this point,
+ * not sure which one, but that isn't even important.
+ */
+ d_rehash(whiteout);
+ return 0;
+}
+
+/*
+ * The VFS layer already does all the dentry stuff for rename,
+ * we just have to decrement the usage count for the target if
+ * it exists so that the VFS layer correctly free's it when it
+ * gets overwritten.
+ */
+static int shmem_rename2(struct user_namespace *mnt_userns,
+ struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
+{
+ struct inode *inode = d_inode(old_dentry);
+ int they_are_dirs = S_ISDIR(inode->i_mode);
+
+ if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
+ return -EINVAL;
+
+ if (flags & RENAME_EXCHANGE)
+ return simple_rename_exchange(old_dir, old_dentry, new_dir, new_dentry);
+
+ if (!simple_empty(new_dentry))
+ return -ENOTEMPTY;
+
+ if (flags & RENAME_WHITEOUT) {
+ int error;
+
+ error = shmem_whiteout(&init_user_ns, old_dir, old_dentry);
+ if (error)
+ return error;
+ }
+
+ if (d_really_is_positive(new_dentry)) {
+ (void) shmem_unlink(new_dir, new_dentry);
+ if (they_are_dirs) {
+ drop_nlink(d_inode(new_dentry));
+ drop_nlink(old_dir);
+ }
+ } else if (they_are_dirs) {
+ drop_nlink(old_dir);
+ inc_nlink(new_dir);
+ }
+
+ old_dir->i_size -= BOGO_DIRENT_SIZE;
+ new_dir->i_size += BOGO_DIRENT_SIZE;
+ old_dir->i_ctime = old_dir->i_mtime =
+ new_dir->i_ctime = new_dir->i_mtime =
+ inode->i_ctime = current_time(old_dir);
+ inode_inc_iversion(old_dir);
+ inode_inc_iversion(new_dir);
+ return 0;
+}
+
+static int shmem_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+ struct dentry *dentry, const char *symname)
+{
+ int error;
+ int len;
+ struct inode *inode;
+ struct folio *folio;
+
+ len = strlen(symname) + 1;
+ if (len > PAGE_SIZE)
+ return -ENAMETOOLONG;
+
+ inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK | 0777, 0,
+ VM_NORESERVE);
+ if (!inode)
+ return -ENOSPC;
+
+ error = security_inode_init_security(inode, dir, &dentry->d_name,
+ shmem_initxattrs, NULL);
+ if (error && error != -EOPNOTSUPP) {
+ iput(inode);
+ return error;
+ }
+
+ inode->i_size = len-1;
+ if (len <= SHORT_SYMLINK_LEN) {
+ inode->i_link = kmemdup(symname, len, GFP_KERNEL);
+ if (!inode->i_link) {
+ iput(inode);
+ return -ENOMEM;
+ }
+ inode->i_op = &shmem_short_symlink_operations;
+ } else {
+ inode_nohighmem(inode);
+ error = shmem_get_folio(inode, 0, &folio, SGP_WRITE);
+ if (error) {
+ iput(inode);
+ return error;
+ }
+ inode->i_mapping->a_ops = &shmem_aops;
+ inode->i_op = &shmem_symlink_inode_operations;
+ memcpy(folio_address(folio), symname, len);
+ folio_mark_uptodate(folio);
+ folio_mark_dirty(folio);
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+ dir->i_size += BOGO_DIRENT_SIZE;
+ dir->i_ctime = dir->i_mtime = current_time(dir);
+ inode_inc_iversion(dir);
+ d_instantiate(dentry, inode);
+ dget(dentry);
+ return 0;
+}
+
+static void shmem_put_link(void *arg)
+{
+ folio_mark_accessed(arg);
+ folio_put(arg);
+}
+
+static const char *shmem_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ struct folio *folio = NULL;
+ int error;
+
+ if (!dentry) {
+ folio = filemap_get_folio(inode->i_mapping, 0);
+ if (!folio)
+ return ERR_PTR(-ECHILD);
+ if (PageHWPoison(folio_page(folio, 0)) ||
+ !folio_test_uptodate(folio)) {
+ folio_put(folio);
+ return ERR_PTR(-ECHILD);
+ }
+ } else {
+ error = shmem_get_folio(inode, 0, &folio, SGP_READ);
+ if (error)
+ return ERR_PTR(error);
+ if (!folio)
+ return ERR_PTR(-ECHILD);
+ if (PageHWPoison(folio_page(folio, 0))) {
+ folio_unlock(folio);
+ folio_put(folio);
+ return ERR_PTR(-ECHILD);
+ }
+ folio_unlock(folio);
+ }
+ set_delayed_call(done, shmem_put_link, folio);
+ return folio_address(folio);
+}
+
+#ifdef CONFIG_TMPFS_XATTR
+
+static int shmem_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+{
+ struct shmem_inode_info *info = SHMEM_I(d_inode(dentry));
+
+ fileattr_fill_flags(fa, info->fsflags & SHMEM_FL_USER_VISIBLE);
+
+ return 0;
+}
+
+static int shmem_fileattr_set(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct fileattr *fa)
+{
+ struct inode *inode = d_inode(dentry);
+ struct shmem_inode_info *info = SHMEM_I(inode);
+
+ if (fileattr_has_fsx(fa))
+ return -EOPNOTSUPP;
+ if (fa->flags & ~SHMEM_FL_USER_MODIFIABLE)
+ return -EOPNOTSUPP;
+
+ info->fsflags = (info->fsflags & ~SHMEM_FL_USER_MODIFIABLE) |
+ (fa->flags & SHMEM_FL_USER_MODIFIABLE);
+
+ shmem_set_inode_flags(inode, info->fsflags);
+ inode->i_ctime = current_time(inode);
+ inode_inc_iversion(inode);
+ return 0;
+}
+
+/*
+ * Superblocks without xattr inode operations may get some security.* xattr
+ * support from the LSM "for free". As soon as we have any other xattrs
+ * like ACLs, we also need to implement the security.* handlers at
+ * filesystem level, though.
+ */
+
+/*
+ * Callback for security_inode_init_security() for acquiring xattrs.
+ */
+static int shmem_initxattrs(struct inode *inode,
+ const struct xattr *xattr_array,
+ void *fs_info)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ const struct xattr *xattr;
+ struct simple_xattr *new_xattr;
+ size_t len;
+
+ for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+ new_xattr = simple_xattr_alloc(xattr->value, xattr->value_len);
+ if (!new_xattr)
+ return -ENOMEM;
+
+ len = strlen(xattr->name) + 1;
+ new_xattr->name = kmalloc(XATTR_SECURITY_PREFIX_LEN + len,
+ GFP_KERNEL);
+ if (!new_xattr->name) {
+ kvfree(new_xattr);
+ return -ENOMEM;
+ }
+
+ memcpy(new_xattr->name, XATTR_SECURITY_PREFIX,
+ XATTR_SECURITY_PREFIX_LEN);
+ memcpy(new_xattr->name + XATTR_SECURITY_PREFIX_LEN,
+ xattr->name, len);
+
+ simple_xattr_list_add(&info->xattrs, new_xattr);
+ }
+
+ return 0;
+}
+
+static int shmem_xattr_handler_get(const struct xattr_handler *handler,
+ struct dentry *unused, struct inode *inode,
+ const char *name, void *buffer, size_t size)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+
+ name = xattr_full_name(handler, name);
+ return simple_xattr_get(&info->xattrs, name, buffer, size);
+}
+
+static int shmem_xattr_handler_set(const struct xattr_handler *handler,
+ struct user_namespace *mnt_userns,
+ struct dentry *unused, struct inode *inode,
+ const char *name, const void *value,
+ size_t size, int flags)
+{
+ struct shmem_inode_info *info = SHMEM_I(inode);
+ int err;
+
+ name = xattr_full_name(handler, name);
+ err = simple_xattr_set(&info->xattrs, name, value, size, flags, NULL);
+ if (!err) {
+ inode->i_ctime = current_time(inode);
+ inode_inc_iversion(inode);
+ }
+ return err;
+}
+
+static const struct xattr_handler shmem_security_xattr_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .get = shmem_xattr_handler_get,
+ .set = shmem_xattr_handler_set,
+};
+
+static const struct xattr_handler shmem_trusted_xattr_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .get = shmem_xattr_handler_get,
+ .set = shmem_xattr_handler_set,
+};
+
+static const struct xattr_handler *shmem_xattr_handlers[] = {
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ &posix_acl_access_xattr_handler,
+ &posix_acl_default_xattr_handler,
+#endif
+ &shmem_security_xattr_handler,
+ &shmem_trusted_xattr_handler,
+ NULL
+};
+
+static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+ struct shmem_inode_info *info = SHMEM_I(d_inode(dentry));
+ return simple_xattr_list(d_inode(dentry), &info->xattrs, buffer, size);
+}
+#endif /* CONFIG_TMPFS_XATTR */
+
+static const struct inode_operations shmem_short_symlink_operations = {
+ .getattr = shmem_getattr,
+ .get_link = simple_get_link,
+#ifdef CONFIG_TMPFS_XATTR
+ .listxattr = shmem_listxattr,
+#endif
+};
+
+static const struct inode_operations shmem_symlink_inode_operations = {
+ .getattr = shmem_getattr,
+ .get_link = shmem_get_link,
+#ifdef CONFIG_TMPFS_XATTR
+ .listxattr = shmem_listxattr,
+#endif
+};
+
+static struct dentry *shmem_get_parent(struct dentry *child)
+{
+ return ERR_PTR(-ESTALE);
+}
+
+static int shmem_match(struct inode *ino, void *vfh)
+{
+ __u32 *fh = vfh;
+ __u64 inum = fh[2];
+ inum = (inum << 32) | fh[1];
+ return ino->i_ino == inum && fh[0] == ino->i_generation;
+}
+
+/* Find any alias of inode, but prefer a hashed alias */
+static struct dentry *shmem_find_alias(struct inode *inode)
+{
+ struct dentry *alias = d_find_alias(inode);
+
+ return alias ?: d_find_any_alias(inode);
+}
+
+
+static struct dentry *shmem_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ struct inode *inode;
+ struct dentry *dentry = NULL;
+ u64 inum;
+
+ if (fh_len < 3)
+ return NULL;
+
+ inum = fid->raw[2];
+ inum = (inum << 32) | fid->raw[1];
+
+ inode = ilookup5(sb, (unsigned long)(inum + fid->raw[0]),
+ shmem_match, fid->raw);
+ if (inode) {
+ dentry = shmem_find_alias(inode);
+ iput(inode);
+ }
+
+ return dentry;
+}
+
+static int shmem_encode_fh(struct inode *inode, __u32 *fh, int *len,
+ struct inode *parent)
+{
+ if (*len < 3) {
+ *len = 3;
+ return FILEID_INVALID;
+ }
+
+ if (inode_unhashed(inode)) {
+ /* Unfortunately insert_inode_hash is not idempotent,
+ * so as we hash inodes here rather than at creation
+ * time, we need a lock to ensure we only try
+ * to do it once
+ */
+ static DEFINE_SPINLOCK(lock);
+ spin_lock(&lock);
+ if (inode_unhashed(inode))
+ __insert_inode_hash(inode,
+ inode->i_ino + inode->i_generation);
+ spin_unlock(&lock);
+ }
+
+ fh[0] = inode->i_generation;
+ fh[1] = inode->i_ino;
+ fh[2] = ((__u64)inode->i_ino) >> 32;
+
+ *len = 3;
+ return 1;
+}
+
+static const struct export_operations shmem_export_ops = {
+ .get_parent = shmem_get_parent,
+ .encode_fh = shmem_encode_fh,
+ .fh_to_dentry = shmem_fh_to_dentry,
+};
+
+enum shmem_param {
+ Opt_gid,
+ Opt_huge,
+ Opt_mode,
+ Opt_mpol,
+ Opt_nr_blocks,
+ Opt_nr_inodes,
+ Opt_size,
+ Opt_uid,
+ Opt_inode32,
+ Opt_inode64,
+};
+
+static const struct constant_table shmem_param_enums_huge[] = {
+ {"never", SHMEM_HUGE_NEVER },
+ {"always", SHMEM_HUGE_ALWAYS },
+ {"within_size", SHMEM_HUGE_WITHIN_SIZE },
+ {"advise", SHMEM_HUGE_ADVISE },
+ {}
+};
+
+const struct fs_parameter_spec shmem_fs_parameters[] = {
+ fsparam_u32 ("gid", Opt_gid),
+ fsparam_enum ("huge", Opt_huge, shmem_param_enums_huge),
+ fsparam_u32oct("mode", Opt_mode),
+ fsparam_string("mpol", Opt_mpol),
+ fsparam_string("nr_blocks", Opt_nr_blocks),
+ fsparam_string("nr_inodes", Opt_nr_inodes),
+ fsparam_string("size", Opt_size),
+ fsparam_u32 ("uid", Opt_uid),
+ fsparam_flag ("inode32", Opt_inode32),
+ fsparam_flag ("inode64", Opt_inode64),
+ {}
+};
+
+static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct shmem_options *ctx = fc->fs_private;
+ struct fs_parse_result result;
+ unsigned long long size;
+ char *rest;
+ int opt;
+ kuid_t kuid;
+ kgid_t kgid;
+
+ opt = fs_parse(fc, shmem_fs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_size:
+ size = memparse(param->string, &rest);
+ if (*rest == '%') {
+ size <<= PAGE_SHIFT;
+ size *= totalram_pages();
+ do_div(size, 100);
+ rest++;
+ }
+ if (*rest)
+ goto bad_value;
+ ctx->blocks = DIV_ROUND_UP(size, PAGE_SIZE);
+ ctx->seen |= SHMEM_SEEN_BLOCKS;
+ break;
+ case Opt_nr_blocks:
+ ctx->blocks = memparse(param->string, &rest);
+ if (*rest || ctx->blocks > S64_MAX)
+ goto bad_value;
+ ctx->seen |= SHMEM_SEEN_BLOCKS;
+ break;
+ case Opt_nr_inodes:
+ ctx->inodes = memparse(param->string, &rest);
+ if (*rest)
+ goto bad_value;
+ ctx->seen |= SHMEM_SEEN_INODES;
+ break;
+ case Opt_mode:
+ ctx->mode = result.uint_32 & 07777;
+ break;
+ case Opt_uid:
+ kuid = make_kuid(current_user_ns(), result.uint_32);
+ if (!uid_valid(kuid))
+ goto bad_value;
+
+ /*
+ * The requested uid must be representable in the
+ * filesystem's idmapping.
+ */
+ if (!kuid_has_mapping(fc->user_ns, kuid))
+ goto bad_value;
+
+ ctx->uid = kuid;
+ break;
+ case Opt_gid:
+ kgid = make_kgid(current_user_ns(), result.uint_32);
+ if (!gid_valid(kgid))
+ goto bad_value;
+
+ /*
+ * The requested gid must be representable in the
+ * filesystem's idmapping.
+ */
+ if (!kgid_has_mapping(fc->user_ns, kgid))
+ goto bad_value;
+
+ ctx->gid = kgid;
+ break;
+ case Opt_huge:
+ ctx->huge = result.uint_32;
+ if (ctx->huge != SHMEM_HUGE_NEVER &&
+ !(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
+ has_transparent_hugepage()))
+ goto unsupported_parameter;
+ ctx->seen |= SHMEM_SEEN_HUGE;
+ break;
+ case Opt_mpol:
+ if (IS_ENABLED(CONFIG_NUMA)) {
+ mpol_put(ctx->mpol);
+ ctx->mpol = NULL;
+ if (mpol_parse_str(param->string, &ctx->mpol))
+ goto bad_value;
+ break;
+ }
+ goto unsupported_parameter;
+ case Opt_inode32:
+ ctx->full_inums = false;
+ ctx->seen |= SHMEM_SEEN_INUMS;
+ break;
+ case Opt_inode64:
+ if (sizeof(ino_t) < 8) {
+ return invalfc(fc,
+ "Cannot use inode64 with <64bit inums in kernel\n");
+ }
+ ctx->full_inums = true;
+ ctx->seen |= SHMEM_SEEN_INUMS;
+ break;
+ }
+ return 0;
+
+unsupported_parameter:
+ return invalfc(fc, "Unsupported parameter '%s'", param->key);
+bad_value:
+ return invalfc(fc, "Bad value for '%s'", param->key);
+}
+
+static int shmem_parse_options(struct fs_context *fc, void *data)
+{
+ char *options = data;
+
+ if (options) {
+ int err = security_sb_eat_lsm_opts(options, &fc->security);
+ if (err)
+ return err;
+ }
+
+ while (options != NULL) {
+ char *this_char = options;
+ for (;;) {
+ /*
+ * NUL-terminate this option: unfortunately,
+ * mount options form a comma-separated list,
+ * but mpol's nodelist may also contain commas.
+ */
+ options = strchr(options, ',');
+ if (options == NULL)
+ break;
+ options++;
+ if (!isdigit(*options)) {
+ options[-1] = '\0';
+ break;
+ }
+ }
+ if (*this_char) {
+ char *value = strchr(this_char, '=');
+ size_t len = 0;
+ int err;
+
+ if (value) {
+ *value++ = '\0';
+ len = strlen(value);
+ }
+ err = vfs_parse_fs_string(fc, this_char, value, len);
+ if (err < 0)
+ return err;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Reconfigure a shmem filesystem.
+ *
+ * Note that we disallow change from limited->unlimited blocks/inodes while any
+ * are in use; but we must separately disallow unlimited->limited, because in
+ * that case we have no record of how much is already in use.
+ */
+static int shmem_reconfigure(struct fs_context *fc)
+{
+ struct shmem_options *ctx = fc->fs_private;
+ struct shmem_sb_info *sbinfo = SHMEM_SB(fc->root->d_sb);
+ unsigned long inodes;
+ struct mempolicy *mpol = NULL;
+ const char *err;
+
+ raw_spin_lock(&sbinfo->stat_lock);
+ inodes = sbinfo->max_inodes - sbinfo->free_inodes;
+
+ if ((ctx->seen & SHMEM_SEEN_BLOCKS) && ctx->blocks) {
+ if (!sbinfo->max_blocks) {
+ err = "Cannot retroactively limit size";
+ goto out;
+ }
+ if (percpu_counter_compare(&sbinfo->used_blocks,
+ ctx->blocks) > 0) {
+ err = "Too small a size for current use";
+ goto out;
+ }
+ }
+ if ((ctx->seen & SHMEM_SEEN_INODES) && ctx->inodes) {
+ if (!sbinfo->max_inodes) {
+ err = "Cannot retroactively limit inodes";
+ goto out;
+ }
+ if (ctx->inodes < inodes) {
+ err = "Too few inodes for current use";
+ goto out;
+ }
+ }
+
+ if ((ctx->seen & SHMEM_SEEN_INUMS) && !ctx->full_inums &&
+ sbinfo->next_ino > UINT_MAX) {
+ err = "Current inum too high to switch to 32-bit inums";
+ goto out;
+ }
+
+ if (ctx->seen & SHMEM_SEEN_HUGE)
+ sbinfo->huge = ctx->huge;
+ if (ctx->seen & SHMEM_SEEN_INUMS)
+ sbinfo->full_inums = ctx->full_inums;
+ if (ctx->seen & SHMEM_SEEN_BLOCKS)
+ sbinfo->max_blocks = ctx->blocks;
+ if (ctx->seen & SHMEM_SEEN_INODES) {
+ sbinfo->max_inodes = ctx->inodes;
+ sbinfo->free_inodes = ctx->inodes - inodes;
+ }
+
+ /*
+ * Preserve previous mempolicy unless mpol remount option was specified.
+ */
+ if (ctx->mpol) {
+ mpol = sbinfo->mpol;
+ sbinfo->mpol = ctx->mpol; /* transfers initial ref */
+ ctx->mpol = NULL;
+ }
+ raw_spin_unlock(&sbinfo->stat_lock);
+ mpol_put(mpol);
+ return 0;
+out:
+ raw_spin_unlock(&sbinfo->stat_lock);
+ return invalfc(fc, "%s", err);
+}
+
+static int shmem_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct shmem_sb_info *sbinfo = SHMEM_SB(root->d_sb);
+
+ if (sbinfo->max_blocks != shmem_default_max_blocks())
+ seq_printf(seq, ",size=%luk",
+ sbinfo->max_blocks << (PAGE_SHIFT - 10));
+ if (sbinfo->max_inodes != shmem_default_max_inodes())
+ seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
+ if (sbinfo->mode != (0777 | S_ISVTX))
+ seq_printf(seq, ",mode=%03ho", sbinfo->mode);
+ if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID))
+ seq_printf(seq, ",uid=%u",
+ from_kuid_munged(&init_user_ns, sbinfo->uid));
+ if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID))
+ seq_printf(seq, ",gid=%u",
+ from_kgid_munged(&init_user_ns, sbinfo->gid));
+
+ /*
+ * Showing inode{64,32} might be useful even if it's the system default,
+ * since then people don't have to resort to checking both here and
+ * /proc/config.gz to confirm 64-bit inums were successfully applied
+ * (which may not even exist if IKCONFIG_PROC isn't enabled).
+ *
+ * We hide it when inode64 isn't the default and we are using 32-bit
+ * inodes, since that probably just means the feature isn't even under
+ * consideration.
+ *
+ * As such:
+ *
+ * +-----------------+-----------------+
+ * | TMPFS_INODE64=y | TMPFS_INODE64=n |
+ * +------------------+-----------------+-----------------+
+ * | full_inums=true | show | show |
+ * | full_inums=false | show | hide |
+ * +------------------+-----------------+-----------------+
+ *
+ */
+ if (IS_ENABLED(CONFIG_TMPFS_INODE64) || sbinfo->full_inums)
+ seq_printf(seq, ",inode%d", (sbinfo->full_inums ? 64 : 32));
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ /* Rightly or wrongly, show huge mount option unmasked by shmem_huge */
+ if (sbinfo->huge)
+ seq_printf(seq, ",huge=%s", shmem_format_huge(sbinfo->huge));
+#endif
+ shmem_show_mpol(seq, sbinfo->mpol);
+ return 0;
+}
+
+#endif /* CONFIG_TMPFS */
+
+static void shmem_put_super(struct super_block *sb)
+{
+ struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+
+ free_percpu(sbinfo->ino_batch);
+ percpu_counter_destroy(&sbinfo->used_blocks);
+ mpol_put(sbinfo->mpol);
+ kfree(sbinfo);
+ sb->s_fs_info = NULL;
+}
+
+static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+ struct shmem_options *ctx = fc->fs_private;
+ struct inode *inode;
+ struct shmem_sb_info *sbinfo;
+
+ /* Round up to L1_CACHE_BYTES to resist false sharing */
+ sbinfo = kzalloc(max((int)sizeof(struct shmem_sb_info),
+ L1_CACHE_BYTES), GFP_KERNEL);
+ if (!sbinfo)
+ return -ENOMEM;
+
+ sb->s_fs_info = sbinfo;
+
+#ifdef CONFIG_TMPFS
+ /*
+ * Per default we only allow half of the physical ram per
+ * tmpfs instance, limiting inodes to one per page of lowmem;
+ * but the internal instance is left unlimited.
+ */
+ if (!(sb->s_flags & SB_KERNMOUNT)) {
+ if (!(ctx->seen & SHMEM_SEEN_BLOCKS))
+ ctx->blocks = shmem_default_max_blocks();
+ if (!(ctx->seen & SHMEM_SEEN_INODES))
+ ctx->inodes = shmem_default_max_inodes();
+ if (!(ctx->seen & SHMEM_SEEN_INUMS))
+ ctx->full_inums = IS_ENABLED(CONFIG_TMPFS_INODE64);
+ } else {
+ sb->s_flags |= SB_NOUSER;
+ }
+ sb->s_export_op = &shmem_export_ops;
+ sb->s_flags |= SB_NOSEC | SB_I_VERSION;
+#else
+ sb->s_flags |= SB_NOUSER;
+#endif
+ sbinfo->max_blocks = ctx->blocks;
+ sbinfo->free_inodes = sbinfo->max_inodes = ctx->inodes;
+ if (sb->s_flags & SB_KERNMOUNT) {
+ sbinfo->ino_batch = alloc_percpu(ino_t);
+ if (!sbinfo->ino_batch)
+ goto failed;
+ }
+ sbinfo->uid = ctx->uid;
+ sbinfo->gid = ctx->gid;
+ sbinfo->full_inums = ctx->full_inums;
+ sbinfo->mode = ctx->mode;
+ sbinfo->huge = ctx->huge;
+ sbinfo->mpol = ctx->mpol;
+ ctx->mpol = NULL;
+
+ raw_spin_lock_init(&sbinfo->stat_lock);
+ if (percpu_counter_init(&sbinfo->used_blocks, 0, GFP_KERNEL))
+ goto failed;
+ spin_lock_init(&sbinfo->shrinklist_lock);
+ INIT_LIST_HEAD(&sbinfo->shrinklist);
+
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_blocksize = PAGE_SIZE;
+ sb->s_blocksize_bits = PAGE_SHIFT;
+ sb->s_magic = TMPFS_MAGIC;
+ sb->s_op = &shmem_ops;
+ sb->s_time_gran = 1;
+#ifdef CONFIG_TMPFS_XATTR
+ sb->s_xattr = shmem_xattr_handlers;
+#endif
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ sb->s_flags |= SB_POSIXACL;
+#endif
+ uuid_gen(&sb->s_uuid);
+
+ inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE);
+ if (!inode)
+ goto failed;
+ inode->i_uid = sbinfo->uid;
+ inode->i_gid = sbinfo->gid;
+ sb->s_root = d_make_root(inode);
+ if (!sb->s_root)
+ goto failed;
+ return 0;
+
+failed:
+ shmem_put_super(sb);
+ return -ENOMEM;
+}
+
+static int shmem_get_tree(struct fs_context *fc)
+{
+ return get_tree_nodev(fc, shmem_fill_super);
+}
+
+static void shmem_free_fc(struct fs_context *fc)
+{
+ struct shmem_options *ctx = fc->fs_private;
+
+ if (ctx) {
+ mpol_put(ctx->mpol);
+ kfree(ctx);
+ }
+}
+
+static const struct fs_context_operations shmem_fs_context_ops = {
+ .free = shmem_free_fc,
+ .get_tree = shmem_get_tree,
+#ifdef CONFIG_TMPFS
+ .parse_monolithic = shmem_parse_options,
+ .parse_param = shmem_parse_one,
+ .reconfigure = shmem_reconfigure,
+#endif
+};
+
+static struct kmem_cache *shmem_inode_cachep;
+
+static struct inode *shmem_alloc_inode(struct super_block *sb)
+{
+ struct shmem_inode_info *info;
+ info = alloc_inode_sb(sb, shmem_inode_cachep, GFP_KERNEL);
+ if (!info)
+ return NULL;
+ return &info->vfs_inode;
+}
+
+static void shmem_free_in_core_inode(struct inode *inode)
+{
+ if (S_ISLNK(inode->i_mode))
+ kfree(inode->i_link);
+ kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
+}
+
+static void shmem_destroy_inode(struct inode *inode)
+{
+ if (S_ISREG(inode->i_mode))
+ mpol_free_shared_policy(&SHMEM_I(inode)->policy);
+}
+
+static void shmem_init_inode(void *foo)
+{
+ struct shmem_inode_info *info = foo;
+ inode_init_once(&info->vfs_inode);
+}
+
+static void shmem_init_inodecache(void)
+{
+ shmem_inode_cachep = kmem_cache_create("shmem_inode_cache",
+ sizeof(struct shmem_inode_info),
+ 0, SLAB_PANIC|SLAB_ACCOUNT, shmem_init_inode);
+}
+
+static void shmem_destroy_inodecache(void)
+{
+ kmem_cache_destroy(shmem_inode_cachep);
+}
+
+/* Keep the page in page cache instead of truncating it */
+static int shmem_error_remove_page(struct address_space *mapping,
+ struct page *page)
+{
+ return 0;
+}
+
+const struct address_space_operations shmem_aops = {
+ .writepage = shmem_writepage,
+ .dirty_folio = noop_dirty_folio,
+#ifdef CONFIG_TMPFS
+ .write_begin = shmem_write_begin,
+ .write_end = shmem_write_end,
+#endif
+#ifdef CONFIG_MIGRATION
+ .migrate_folio = migrate_folio,
+#endif
+ .error_remove_page = shmem_error_remove_page,
+};
+EXPORT_SYMBOL(shmem_aops);
+
+static const struct file_operations shmem_file_operations = {
+ .mmap = shmem_mmap,
+ .get_unmapped_area = shmem_get_unmapped_area,
+#ifdef CONFIG_TMPFS
+ .llseek = shmem_file_llseek,
+ .read_iter = shmem_file_read_iter,
+ .write_iter = generic_file_write_iter,
+ .fsync = noop_fsync,
+ .splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
+ .fallocate = shmem_fallocate,
+#endif
+};
+
+static const struct inode_operations shmem_inode_operations = {
+ .getattr = shmem_getattr,
+ .setattr = shmem_setattr,
+#ifdef CONFIG_TMPFS_XATTR
+ .listxattr = shmem_listxattr,
+ .set_acl = simple_set_acl,
+ .fileattr_get = shmem_fileattr_get,
+ .fileattr_set = shmem_fileattr_set,
+#endif
+};
+
+static const struct inode_operations shmem_dir_inode_operations = {
+#ifdef CONFIG_TMPFS
+ .getattr = shmem_getattr,
+ .create = shmem_create,
+ .lookup = simple_lookup,
+ .link = shmem_link,
+ .unlink = shmem_unlink,
+ .symlink = shmem_symlink,
+ .mkdir = shmem_mkdir,
+ .rmdir = shmem_rmdir,
+ .mknod = shmem_mknod,
+ .rename = shmem_rename2,
+ .tmpfile = shmem_tmpfile,
+#endif
+#ifdef CONFIG_TMPFS_XATTR
+ .listxattr = shmem_listxattr,
+ .fileattr_get = shmem_fileattr_get,
+ .fileattr_set = shmem_fileattr_set,
+#endif
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ .setattr = shmem_setattr,
+ .set_acl = simple_set_acl,
+#endif
+};
+
+static const struct inode_operations shmem_special_inode_operations = {
+ .getattr = shmem_getattr,
+#ifdef CONFIG_TMPFS_XATTR
+ .listxattr = shmem_listxattr,
+#endif
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ .setattr = shmem_setattr,
+ .set_acl = simple_set_acl,
+#endif
+};
+
+static const struct super_operations shmem_ops = {
+ .alloc_inode = shmem_alloc_inode,
+ .free_inode = shmem_free_in_core_inode,
+ .destroy_inode = shmem_destroy_inode,
+#ifdef CONFIG_TMPFS
+ .statfs = shmem_statfs,
+ .show_options = shmem_show_options,
+#endif
+ .evict_inode = shmem_evict_inode,
+ .drop_inode = generic_delete_inode,
+ .put_super = shmem_put_super,
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ .nr_cached_objects = shmem_unused_huge_count,
+ .free_cached_objects = shmem_unused_huge_scan,
+#endif
+};
+
+static const struct vm_operations_struct shmem_vm_ops = {
+ .fault = shmem_fault,
+ .map_pages = filemap_map_pages,
+#ifdef CONFIG_NUMA
+ .set_policy = shmem_set_policy,
+ .get_policy = shmem_get_policy,
+#endif
+};
+
+int shmem_init_fs_context(struct fs_context *fc)
+{
+ struct shmem_options *ctx;
+
+ ctx = kzalloc(sizeof(struct shmem_options), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->mode = 0777 | S_ISVTX;
+ ctx->uid = current_fsuid();
+ ctx->gid = current_fsgid();
+
+ fc->fs_private = ctx;
+ fc->ops = &shmem_fs_context_ops;
+ return 0;
+}
+
+static struct file_system_type shmem_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "tmpfs",
+ .init_fs_context = shmem_init_fs_context,
+#ifdef CONFIG_TMPFS
+ .parameters = shmem_fs_parameters,
+#endif
+ .kill_sb = kill_litter_super,
+ .fs_flags = FS_USERNS_MOUNT,
+};
+
+void __init shmem_init(void)
+{
+ int error;
+
+ shmem_init_inodecache();
+
+ error = register_filesystem(&shmem_fs_type);
+ if (error) {
+ pr_err("Could not register tmpfs\n");
+ goto out2;
+ }
+
+ shm_mnt = kern_mount(&shmem_fs_type);
+ if (IS_ERR(shm_mnt)) {
+ error = PTR_ERR(shm_mnt);
+ pr_err("Could not kern_mount tmpfs\n");
+ goto out1;
+ }
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ if (has_transparent_hugepage() && shmem_huge > SHMEM_HUGE_DENY)
+ SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge;
+ else
+ shmem_huge = SHMEM_HUGE_NEVER; /* just in case it was patched */
+#endif
+ return;
+
+out1:
+ unregister_filesystem(&shmem_fs_type);
+out2:
+ shmem_destroy_inodecache();
+ shm_mnt = ERR_PTR(error);
+}
+
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(CONFIG_SYSFS)
+static ssize_t shmem_enabled_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ static const int values[] = {
+ SHMEM_HUGE_ALWAYS,
+ SHMEM_HUGE_WITHIN_SIZE,
+ SHMEM_HUGE_ADVISE,
+ SHMEM_HUGE_NEVER,
+ SHMEM_HUGE_DENY,
+ SHMEM_HUGE_FORCE,
+ };
+ int len = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(values); i++) {
+ len += sysfs_emit_at(buf, len,
+ shmem_huge == values[i] ? "%s[%s]" : "%s%s",
+ i ? " " : "",
+ shmem_format_huge(values[i]));
+ }
+
+ len += sysfs_emit_at(buf, len, "\n");
+
+ return len;
+}
+
+static ssize_t shmem_enabled_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ char tmp[16];
+ int huge;
+
+ if (count + 1 > sizeof(tmp))
+ return -EINVAL;
+ memcpy(tmp, buf, count);
+ tmp[count] = '\0';
+ if (count && tmp[count - 1] == '\n')
+ tmp[count - 1] = '\0';
+
+ huge = shmem_parse_huge(tmp);
+ if (huge == -EINVAL)
+ return -EINVAL;
+ if (!has_transparent_hugepage() &&
+ huge != SHMEM_HUGE_NEVER && huge != SHMEM_HUGE_DENY)
+ return -EINVAL;
+
+ shmem_huge = huge;
+ if (shmem_huge > SHMEM_HUGE_DENY)
+ SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge;
+ return count;
+}
+
+struct kobj_attribute shmem_enabled_attr = __ATTR_RW(shmem_enabled);
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE && CONFIG_SYSFS */
+
+#else /* !CONFIG_SHMEM */
+
+/*
+ * tiny-shmem: simple shmemfs and tmpfs using ramfs code
+ *
+ * This is intended for small system where the benefits of the full
+ * shmem code (swap-backed and resource-limited) are outweighed by
+ * their complexity. On systems without swap this code should be
+ * effectively equivalent, but much lighter weight.
+ */
+
+static struct file_system_type shmem_fs_type = {
+ .name = "tmpfs",
+ .init_fs_context = ramfs_init_fs_context,
+ .parameters = ramfs_fs_parameters,
+ .kill_sb = ramfs_kill_sb,
+ .fs_flags = FS_USERNS_MOUNT,
+};
+
+void __init shmem_init(void)
+{
+ BUG_ON(register_filesystem(&shmem_fs_type) != 0);
+
+ shm_mnt = kern_mount(&shmem_fs_type);
+ BUG_ON(IS_ERR(shm_mnt));
+}
+
+int shmem_unuse(unsigned int type)
+{
+ return 0;
+}
+
+int shmem_lock(struct file *file, int lock, struct ucounts *ucounts)
+{
+ return 0;
+}
+
+void shmem_unlock_mapping(struct address_space *mapping)
+{
+}
+
+#ifdef CONFIG_MMU
+unsigned long shmem_get_unmapped_area(struct file *file,
+ unsigned long addr, unsigned long len,
+ unsigned long pgoff, unsigned long flags)
+{
+ return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
+}
+#endif
+
+void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
+{
+ truncate_inode_pages_range(inode->i_mapping, lstart, lend);
+}
+EXPORT_SYMBOL_GPL(shmem_truncate_range);
+
+#define shmem_vm_ops generic_file_vm_ops
+#define shmem_file_operations ramfs_file_operations
+#define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev)
+#define shmem_acct_size(flags, size) 0
+#define shmem_unacct_size(flags, size) do {} while (0)
+
+#endif /* CONFIG_SHMEM */
+
+/* common code */
+
+static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, loff_t size,
+ unsigned long flags, unsigned int i_flags)
+{
+ struct inode *inode;
+ struct file *res;
+
+ if (IS_ERR(mnt))
+ return ERR_CAST(mnt);
+
+ if (size < 0 || size > MAX_LFS_FILESIZE)
+ return ERR_PTR(-EINVAL);
+
+ if (shmem_acct_size(flags, size))
+ return ERR_PTR(-ENOMEM);
+
+ inode = shmem_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0,
+ flags);
+ if (unlikely(!inode)) {
+ shmem_unacct_size(flags, size);
+ return ERR_PTR(-ENOSPC);
+ }
+ inode->i_flags |= i_flags;
+ inode->i_size = size;
+ clear_nlink(inode); /* It is unlinked */
+ res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size));
+ if (!IS_ERR(res))
+ res = alloc_file_pseudo(inode, mnt, name, O_RDWR,
+ &shmem_file_operations);
+ if (IS_ERR(res))
+ iput(inode);
+ return res;
+}
+
+/**
+ * shmem_kernel_file_setup - get an unlinked file living in tmpfs which must be
+ * kernel internal. There will be NO LSM permission checks against the
+ * underlying inode. So users of this interface must do LSM checks at a
+ * higher layer. The users are the big_key and shm implementations. LSM
+ * checks are provided at the key or shm level rather than the inode.
+ * @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_kernel_file_setup(const char *name, loff_t size, unsigned long flags)
+{
+ return __shmem_file_setup(shm_mnt, name, size, flags, S_PRIVATE);
+}
+
+/**
+ * shmem_file_setup - get an unlinked file living in tmpfs
+ * @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)
+{
+ return __shmem_file_setup(shm_mnt, name, size, flags, 0);
+}
+EXPORT_SYMBOL_GPL(shmem_file_setup);
+
+/**
+ * shmem_file_setup_with_mnt - 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_with_mnt(struct vfsmount *mnt, const char *name,
+ loff_t size, unsigned long flags)
+{
+ return __shmem_file_setup(mnt, name, size, flags, 0);
+}
+EXPORT_SYMBOL_GPL(shmem_file_setup_with_mnt);
+
+/**
+ * shmem_zero_setup - setup a shared anonymous mapping
+ * @vma: the vma to be mmapped is prepared by do_mmap
+ */
+int shmem_zero_setup(struct vm_area_struct *vma)
+{
+ struct file *file;
+ loff_t size = vma->vm_end - vma->vm_start;
+
+ /*
+ * Cloning a new file under mmap_lock leads to a lock ordering conflict
+ * between XFS directory reading and selinux: since this file is only
+ * 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_kernel_file_setup("dev/zero", size, vma->vm_flags);
+ if (IS_ERR(file))
+ return PTR_ERR(file);
+
+ if (vma->vm_file)
+ fput(vma->vm_file);
+ vma->vm_file = file;
+ vma->vm_ops = &shmem_vm_ops;
+
+ return 0;
+}
+
+/**
+ * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
+ * @mapping: the page's address_space
+ * @index: the page index
+ * @gfp: the page allocator flags to use if allocating
+ *
+ * This behaves as a tmpfs "read_cache_page_gfp(mapping, index, gfp)",
+ * with any new page allocations done using the specified allocation flags.
+ * But read_cache_page_gfp() uses the ->read_folio() method: which does not
+ * suit tmpfs, since it may have pages in swapcache, and needs to find those
+ * for itself; although drivers/gpu/drm i915 and ttm rely upon this support.
+ *
+ * i915_gem_object_get_pages_gtt() mixes __GFP_NORETRY | __GFP_NOWARN in
+ * with the mapping_gfp_mask(), to avoid OOMing the machine unnecessarily.
+ */
+struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
+ pgoff_t index, gfp_t gfp)
+{
+#ifdef CONFIG_SHMEM
+ struct inode *inode = mapping->host;
+ struct folio *folio;
+ struct page *page;
+ int error;
+
+ BUG_ON(!shmem_mapping(mapping));
+ error = shmem_get_folio_gfp(inode, index, &folio, SGP_CACHE,
+ gfp, NULL, NULL, NULL);
+ if (error)
+ return ERR_PTR(error);
+
+ folio_unlock(folio);
+ page = folio_file_page(folio, index);
+ if (PageHWPoison(page)) {
+ folio_put(folio);
+ return ERR_PTR(-EIO);
+ }
+
+ return page;
+#else
+ /*
+ * The tiny !SHMEM case uses ramfs without swap
+ */
+ return read_cache_page_gfp(mapping, index, gfp);
+#endif
+}
+EXPORT_SYMBOL_GPL(shmem_read_mapping_page_gfp);