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fuse: allow fine grained attr cache invaldation

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This patch adds the infrastructure for more fine grained attribute
invalidation.  Currently only 'atime' is invalidated separately.

The use of this infrastructure is extended to the statx(2) interface, which
for now means that if only 'atime' is invalid and STATX_ATIME is not
specified in the mask argument, then no GETATTR request will be generated.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2018-10-15 15:43:06 +02:00
parent edfa87281f
commit 2f1e81965f
3 changed files with 18 additions and 5 deletions
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2
fs/fuse/inode.c
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@@ -90,6 +90,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
fi = get_fuse_inode(inode);
fi->i_time = 0;
fi->inval_mask = 0;
fi->nodeid = 0;
fi->nlookup = 0;
fi->attr_version = 0;
@@ -164,6 +165,7 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
fi->attr_version = ++fc->attr_version;
fi->i_time = attr_valid;
WRITE_ONCE(fi->inval_mask, 0);
inode->i_ino = fuse_squash_ino(attr->ino);
inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);