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fs: reduce pointer chasing in is_mgtime() test

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The is_mgtime test checks whether the FS_MGTIME flag is set in the
fstype. To get there from the inode though, we have to dereference 3
pointers.

Add a new IOP_MGTIME flag, and have inode_init_always() set that flag
when the fstype flag is set. Then, make is_mgtime test for IOP_MGTIME
instead.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20241113-mgtime-v1-1-84e256980e11@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jeff Layton 2024-11-13 09:17:51 -05:00 committed by Christian Brauner
parent b40508ca5d
commit 9fed2c0f2f
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2 changed files with 4 additions and 1 deletions
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2
fs/inode.c
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@ -241,6 +241,8 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
inode->i_opflags = 0;
if (sb->s_xattr)
inode->i_opflags |= IOP_XATTR;
if (sb->s_type->fs_flags & FS_MGTIME)
inode->i_opflags |= IOP_MGTIME;
i_uid_write(inode, 0);
i_gid_write(inode, 0);
atomic_set(&inode->i_writecount, 0);

3
include/linux/fs.h
View File

@ -623,6 +623,7 @@ is_uncached_acl(struct posix_acl *acl)
#define IOP_NOFOLLOW 0x0004
#define IOP_XATTR 0x0008
#define IOP_DEFAULT_READLINK 0x0010
#define IOP_MGTIME 0x0020
/*
* Keep mostly read-only and often accessed (especially for
@ -2581,7 +2582,7 @@ struct file_system_type {
*/
static inline bool is_mgtime(const struct inode *inode)
{
return inode->i_sb->s_type->fs_flags & FS_MGTIME;
return inode->i_opflags & IOP_MGTIME;
}
extern struct dentry *mount_bdev(struct file_system_type *fs_type,