linux-kernel - [PATCH mmotm] tmpfs: three tweaks to creation time patch

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Date:   Sat, 26 Feb 2022 22:30:01 -0800 (PST)
From:   Hugh Dickins <hughd@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
cc:     Xavier Roche <xavier.roche@...olia.com>,
        Jean Delvare <jdelvare@...e.de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH mmotm] tmpfs: three tweaks to creation time patch

Thank you to Xavier Roche for his tmpfs file creation time patch.
Please apply these 3 tweaks on top (and fold in when sending to Linus):

1. Move vfs_inode back to being last element of shmem_inode_info.
2. Remove unnecessary parentheses from condition in shmem_getattr().
3. Using shmem_getattr() on other file types than regular requires that
   shmem_is_huge() check type, to stop incorrect HPAGE_PMD_SIZE blksize.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
---
Cleanups and fix to tmpfs-support-for-file-creation-time.patch

 include/linux/shmem_fs.h |    2 +-
 mm/shmem.c               |    7 +++----
 2 files changed, 4 insertions(+), 5 deletions(-)

--- mmotm/include/linux/shmem_fs.h
+++ linux/include/linux/shmem_fs.h
@@ -24,8 +24,8 @@ struct shmem_inode_info {
 	struct shared_policy	policy;		/* NUMA memory alloc policy */
 	struct simple_xattrs	xattrs;		/* list of xattrs */
 	atomic_t		stop_eviction;	/* hold when working on inode */
-	struct inode		vfs_inode;
 	struct timespec64	i_crtime;	/* file creation time */
+	struct inode		vfs_inode;
 };
 
 struct shmem_sb_info {
--- mmotm/mm/shmem.c
+++ linux/mm/shmem.c
@@ -476,6 +476,8 @@ bool shmem_is_huge(struct vm_area_struct
 {
 	loff_t i_size;
 
+	if (!S_ISREG(inode->i_mode))
+		return false;
 	if (shmem_huge == SHMEM_HUGE_DENY)
 		return false;
 	if (vma && ((vma->vm_flags & VM_NOHUGEPAGE) ||
@@ -1061,7 +1063,7 @@ static int shmem_getattr(struct user_nam
 	if (shmem_is_huge(NULL, inode, 0))
 		stat->blksize = HPAGE_PMD_SIZE;
 
-	if ((request_mask & STATX_BTIME)) {
+	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;
@@ -1860,9 +1862,6 @@ repeat:
 		return 0;
 	}
 
-	/* Never use a huge page for shmem_symlink() */
-	if (S_ISLNK(inode->i_mode))
-		goto alloc_nohuge;
 	if (!shmem_is_huge(vma, inode, index))
 		goto alloc_nohuge;