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Message-Id: <20230424151104.175456-3-jlayton@kernel.org>
Date: Mon, 24 Apr 2023 11:11:03 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
"Darrick J. Wong" <djwong@...nel.org>,
Hugh Dickins <hughd@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Dave Chinner <david@...morbit.com>,
Chuck Lever <chuck.lever@...cle.com>
Cc: Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-xfs@...r.kernel.org, linux-mm@...ck.org,
linux-nfs@...r.kernel.org
Subject: [PATCH v2 2/3] shmem: mark for high-res timestamps on next update after getattr
Change the s_time_gran for tmpfs to 2, to make it eligible to use the
low order bit as a flag. Switch to the current_ctime helper instead
of current_time.
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
mm/shmem.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index 448f393d8ab2..497ffa29d172 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1039,7 +1039,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
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->i_ctime = inode->i_mtime = current_ctime(inode);
inode_inc_iversion(inode);
}
EXPORT_SYMBOL_GPL(shmem_truncate_range);
@@ -1070,6 +1070,11 @@ static int shmem_getattr(struct mnt_idmap *idmap,
if (shmem_is_huge(inode, 0, false, NULL, 0))
stat->blksize = HPAGE_PMD_SIZE;
+ if (request_mask & (STATX_CTIME|STATX_MTIME))
+ generic_fill_multigrain_cmtime(inode, stat);
+ else
+ stat->result_mask &= ~(STATX_CTIME|STATX_MTIME);
+
if (request_mask & STATX_BTIME) {
stat->result_mask |= STATX_BTIME;
stat->btime.tv_sec = info->i_crtime.tv_sec;
@@ -1136,7 +1141,7 @@ static int shmem_setattr(struct mnt_idmap *idmap,
if (attr->ia_valid & ATTR_MODE)
error = posix_acl_chmod(idmap, dentry, inode->i_mode);
if (!error && update_ctime) {
- inode->i_ctime = current_time(inode);
+ inode->i_ctime = current_ctime(inode);
if (update_mtime)
inode->i_mtime = inode->i_ctime;
inode_inc_iversion(inode);
@@ -2361,7 +2366,7 @@ static struct inode *shmem_get_inode(struct mnt_idmap *idmap, struct super_block
inode->i_ino = ino;
inode_init_owner(idmap, inode, dir, mode);
inode->i_blocks = 0;
- inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
+ inode->i_atime = inode->i_mtime = inode->i_ctime = current_ctime(inode);
inode->i_generation = get_random_u32();
info = SHMEM_I(inode);
memset(info, 0, (char *)inode - (char *)info);
@@ -2940,7 +2945,7 @@ shmem_mknod(struct mnt_idmap *idmap, struct inode *dir,
error = 0;
dir->i_size += BOGO_DIRENT_SIZE;
- dir->i_ctime = dir->i_mtime = current_time(dir);
+ dir->i_ctime = dir->i_mtime = current_ctime(dir);
inode_inc_iversion(dir);
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
@@ -3016,7 +3021,7 @@ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentr
}
dir->i_size += BOGO_DIRENT_SIZE;
- inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
+ inode->i_ctime = dir->i_ctime = dir->i_mtime = current_ctime(inode);
inode_inc_iversion(dir);
inc_nlink(inode);
ihold(inode); /* New dentry reference */
@@ -3034,7 +3039,7 @@ static int shmem_unlink(struct inode *dir, struct dentry *dentry)
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->i_ctime = dir->i_ctime = dir->i_mtime = current_ctime(inode);
inode_inc_iversion(dir);
drop_nlink(inode);
dput(dentry); /* Undo the count from "create" - this does all the work */
@@ -3124,7 +3129,7 @@ static int shmem_rename2(struct mnt_idmap *idmap,
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->i_ctime = current_ctime(old_dir);
inode_inc_iversion(old_dir);
inode_inc_iversion(new_dir);
return 0;
@@ -3178,7 +3183,7 @@ static int shmem_symlink(struct mnt_idmap *idmap, struct inode *dir,
folio_put(folio);
}
dir->i_size += BOGO_DIRENT_SIZE;
- dir->i_ctime = dir->i_mtime = current_time(dir);
+ dir->i_ctime = dir->i_mtime = current_ctime(dir);
inode_inc_iversion(dir);
d_instantiate(dentry, inode);
dget(dentry);
@@ -3250,7 +3255,7 @@ static int shmem_fileattr_set(struct mnt_idmap *idmap,
(fa->flags & SHMEM_FL_USER_MODIFIABLE);
shmem_set_inode_flags(inode, info->fsflags);
- inode->i_ctime = current_time(inode);
+ inode->i_ctime = current_ctime(inode);
inode_inc_iversion(inode);
return 0;
}
@@ -3320,7 +3325,7 @@ static int shmem_xattr_handler_set(const struct xattr_handler *handler,
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->i_ctime = current_ctime(inode);
inode_inc_iversion(inode);
}
return err;
@@ -3786,7 +3791,7 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_flags |= SB_NOUSER;
}
sb->s_export_op = &shmem_export_ops;
- sb->s_flags |= SB_NOSEC | SB_I_VERSION;
+ sb->s_flags |= SB_NOSEC | SB_I_VERSION | SB_MULTIGRAIN_TS;
#else
sb->s_flags |= SB_NOUSER;
#endif
@@ -3816,7 +3821,7 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_blocksize_bits = PAGE_SHIFT;
sb->s_magic = TMPFS_MAGIC;
sb->s_op = &shmem_ops;
- sb->s_time_gran = 1;
+ sb->s_time_gran = 2;
#ifdef CONFIG_TMPFS_XATTR
sb->s_xattr = shmem_xattr_handlers;
#endif
--
2.40.0
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