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ovl: update of dentry revalidate flags after copy up 

[ Upstream commit b07d5cc93e ]

After copy up, we may need to update d_flags if upper dentry is on a
remote fs and lower dentries are not.

Add helpers to allow incremental update of the revalidate flags.

Fixes: bccece1ead ("ovl: allow remote upper")
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Amir Goldstein 2023-04-03 11:29:59 +03:00 committed by Greg Kroah-Hartman
parent 5397290815
commit 33ab4dd620
7 changed files with 30 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/overlayfs/copy_up.c
View File

@ -576,6 +576,7 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
/* Restore timestamps on parent (best effort) */
ovl_set_timestamps(ofs, upperdir, &c->pstat);
ovl_dentry_set_upper_alias(c->dentry);
ovl_dentry_update_reval(c->dentry, upper);
}
}
inode_unlock(udir);
@ -895,6 +896,7 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
inode_unlock(udir);
ovl_dentry_set_upper_alias(c->dentry);
ovl_dentry_update_reval(c->dentry, ovl_dentry_upper(c->dentry));
}
out:

3
fs/overlayfs/dir.c
View File

@ -269,8 +269,7 @@ static int ovl_instantiate(struct dentry *dentry, struct inode *inode,
ovl_dir_modified(dentry->d_parent, false);
ovl_dentry_set_upper_alias(dentry);
ovl_dentry_update_reval(dentry, newdentry,
DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
ovl_dentry_init_reval(dentry, newdentry);
if (!hardlink) {
/*

3
fs/overlayfs/export.c
View File

@ -326,8 +326,7 @@ static struct dentry *ovl_obtain_alias(struct super_block *sb,
if (upper_alias)
ovl_dentry_set_upper_alias(dentry);
ovl_dentry_update_reval(dentry, upper,
DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
ovl_dentry_init_reval(dentry, upper);
return d_instantiate_anon(dentry, inode);

3
fs/overlayfs/namei.c
View File

@ -1122,8 +1122,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
ovl_set_flag(OVL_UPPERDATA, inode);
}
ovl_dentry_update_reval(dentry, upperdentry,
DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
ovl_dentry_init_reval(dentry, upperdentry);
revert_creds(old_cred);
if (origin_path) {

6
fs/overlayfs/overlayfs.h
View File

@ -375,8 +375,10 @@ bool ovl_index_all(struct super_block *sb);
bool ovl_verify_lower(struct super_block *sb);
struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
bool ovl_dentry_remote(struct dentry *dentry);
void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry,
unsigned int mask);
void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry);
void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry);
void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
unsigned int mask);
bool ovl_dentry_weird(struct dentry *dentry);
enum ovl_path_type ovl_path_type(struct dentry *dentry);
void ovl_path_upper(struct dentry *dentry, struct path *path);

2
fs/overlayfs/super.c
View File

@ -1885,7 +1885,7 @@ static struct dentry *ovl_get_root(struct super_block *sb,
ovl_dentry_set_flag(OVL_E_CONNECTED, root);
ovl_set_upperdata(d_inode(root));
ovl_inode_init(d_inode(root), &oip, ino, fsid);
ovl_dentry_update_reval(root, upperdentry, DCACHE_OP_WEAK_REVALIDATE);
ovl_dentry_init_flags(root, upperdentry, DCACHE_OP_WEAK_REVALIDATE);
return root;
}

24
fs/overlayfs/util.c
View File

@ -94,14 +94,30 @@ struct ovl_entry *ovl_alloc_entry(unsigned int numlower)
return oe;
}
#define OVL_D_REVALIDATE (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE)
bool ovl_dentry_remote(struct dentry *dentry)
{
return dentry->d_flags &
(DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
return dentry->d_flags & OVL_D_REVALIDATE;
}
void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *upperdentry,
unsigned int mask)
void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry)
{
if (!ovl_dentry_remote(realdentry))
return;
spin_lock(&dentry->d_lock);
dentry->d_flags |= realdentry->d_flags & OVL_D_REVALIDATE;
spin_unlock(&dentry->d_lock);
}
void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry)
{
return ovl_dentry_init_flags(dentry, upperdentry, OVL_D_REVALIDATE);
}
void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
unsigned int mask)
{
struct ovl_entry *oe = OVL_E(dentry);
unsigned int i, flags = 0;