1 files changed, 15 insertions, 11 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index 0c5fb4ffa03a..3129210eab96 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2259,6 +2259,7 @@ static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
 	folio = swap_cache_get_folio(swap, NULL, 0);
 	order = xa_get_order(&mapping->i_pages, index);
 	if (!folio) {
+		int nr_pages = 1 << order;
 		bool fallback_order0 = false;
 
 		/* Or update major stats only when swapin succeeds?? */
@@ -2272,9 +2273,12 @@ static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
 		 * If uffd is active for the vma, we need per-page fault
 		 * fidelity to maintain the uffd semantics, then fallback
 		 * to swapin order-0 folio, as well as for zswap case.
+		 * Any existing sub folio in the swap cache also blocks
+		 * mTHP swapin.
 		 */
 		if (order > 0 && ((vma && unlikely(userfaultfd_armed(vma))) ||
-				  !zswap_never_enabled()))
+				  !zswap_never_enabled() ||
+				  non_swapcache_batch(swap, nr_pages) != nr_pages))
 			fallback_order0 = true;
 
 		/* Skip swapcache for synchronous device. */
@@ -3266,9 +3270,9 @@ 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 folio **foliop, void **fsdata)
+shmem_write_begin(const struct kiocb *iocb, struct address_space *mapping,
+		  loff_t pos, unsigned len,
+		  struct folio **foliop, void **fsdata)
 {
 	struct inode *inode = mapping->host;
 	struct shmem_inode_info *info = SHMEM_I(inode);
@@ -3300,9 +3304,9 @@ shmem_write_begin(struct file *file, struct address_space *mapping,
 }
 
 static int
-shmem_write_end(struct file *file, struct address_space *mapping,
-			loff_t pos, unsigned len, unsigned copied,
-			struct folio *folio, void *fsdata)
+shmem_write_end(const struct kiocb *iocb, struct address_space *mapping,
+		loff_t pos, unsigned len, unsigned copied,
+		struct folio *folio, void *fsdata)
 {
 	struct inode *inode = mapping->host;
 
@@ -4183,7 +4187,7 @@ static const char *shmem_get_link(struct dentry *dentry, struct inode *inode,
 
 #ifdef CONFIG_TMPFS_XATTR
 
-static int shmem_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+static int shmem_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
 {
 	struct shmem_inode_info *info = SHMEM_I(d_inode(dentry));
 
@@ -4193,7 +4197,7 @@ static int shmem_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 }
 
 static int shmem_fileattr_set(struct mnt_idmap *idmap,
-			      struct dentry *dentry, struct fileattr *fa)
+			      struct dentry *dentry, struct file_kattr *fa)
 {
 	struct inode *inode = d_inode(dentry);
 	struct shmem_inode_info *info = SHMEM_I(inode);
@@ -4980,7 +4984,6 @@ static void shmem_put_super(struct super_block *sb)
 static const struct dentry_operations shmem_ci_dentry_ops = {
 	.d_hash = generic_ci_d_hash,
 	.d_compare = generic_ci_d_compare,
-	.d_delete = always_delete_dentry,
 };
 #endif
 
@@ -5028,7 +5031,7 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
 
 	if (ctx->encoding) {
 		sb->s_encoding = ctx->encoding;
-		sb->s_d_op = &shmem_ci_dentry_ops;
+		set_default_d_op(sb, &shmem_ci_dentry_ops);
 		if (ctx->strict_encoding)
 			sb->s_encoding_flags = SB_ENC_STRICT_MODE_FL;
 	}
@@ -5037,6 +5040,7 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
 #else
 	sb->s_flags |= SB_NOUSER;
 #endif /* CONFIG_TMPFS */
+	sb->s_d_flags |= DCACHE_DONTCACHE;
 	sbinfo->max_blocks = ctx->blocks;
 	sbinfo->max_inodes = ctx->inodes;
 	sbinfo->free_ispace = sbinfo->max_inodes * BOGO_INODE_SIZE;