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btrfs: utilize IOP_FASTPERM_MAY_EXEC

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Root filesystem was ext4, btrfs was mounted on /testfs.

Then issuing access(2) in a loop on /testfs/repos/linux/include/linux/fs.h
on Sapphire Rapids (ops/s):

before: 3447976
after:	3620879 (+5%)

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://patch.msgid.link/20251107142149.989998-3-mjguzik@gmail.com
Acked-by: David Sterba <dsterba@suse.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Mateusz Guzik
2025-11-07 15:21:48 +01:00
committed by Christian Brauner
parent e631df89cd
commit 3e18f6256e
1 changed files with 11 additions and 1 deletions
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12
fs/btrfs/inode.c
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@@ -5837,6 +5837,8 @@ struct btrfs_inode *btrfs_iget(u64 ino, struct btrfs_root *root)
if (ret)
return ERR_PTR(ret);
if (S_ISDIR(inode->vfs_inode.i_mode))
inode->vfs_inode.i_opflags |= IOP_FASTPERM_MAY_EXEC;
unlock_new_inode(&inode->vfs_inode);
return inode;
}
@@ -6788,8 +6790,11 @@ static int btrfs_create_common(struct inode *dir, struct dentry *dentry,
}
ret = btrfs_create_new_inode(trans, &new_inode_args);
if (!ret)
if (!ret) {
if (S_ISDIR(inode->i_mode))
inode->i_opflags |= IOP_FASTPERM_MAY_EXEC;
d_instantiate_new(dentry, inode);
}
btrfs_end_transaction(trans);
btrfs_btree_balance_dirty(fs_info);
@@ -9169,6 +9174,11 @@ int btrfs_prealloc_file_range_trans(struct inode *inode,
min_size, actual_len, alloc_hint, trans);
}
/*
* NOTE: in case you are adding MAY_EXEC check for directories:
* we are marking them with IOP_FASTPERM_MAY_EXEC, allowing path lookup to
* elide calls here.
*/
static int btrfs_permission(struct mnt_idmap *idmap,
struct inode *inode, int mask)
{