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| author | Miklos Szeredi <mszeredi@redhat.com> | 2016-07-29 13:05:24 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2016-07-29 13:05:24 +0300 |
| commit | 39b681f8026c170a73972517269efc830db0d7ce (patch) | |
| tree | 592a1c87e7b3f16d5422577ee9aa9bd6e93f49e9 /fs/overlayfs/inode.c | |
| parent | a999d7e161a085e30181d0a88f049bd92112e172 (diff) | |
| download | linux-39b681f8026c170a73972517269efc830db0d7ce.tar.xz | |
ovl: store real inode pointer in ->i_private
To get from overlay inode to real inode we currently use 'struct
ovl_entry', which has lifetime connected to overlay dentry. This is okay,
since each overlay dentry had a new overlay inode allocated.
Following patch will break that assumption, so need to leave out ovl_entry.
This patch stores the real inode directly in i_private, with the lowest bit
used to indicate whether the inode is upper or lower.
Lifetime rules remain, using ovl_inode_real() must only be done while
caller holds ref on overlay dentry (and hence on real dentry), or within
RCU protected regions.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/inode.c')
| -rw-r--r-- | fs/overlayfs/inode.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 0598c169ce41..2bdd3cae0f71 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -117,15 +117,12 @@ static int ovl_getattr(struct vfsmount *mnt, struct dentry *dentry, int ovl_permission(struct inode *inode, int mask) { - struct ovl_entry *oe = inode->i_private; bool is_upper; - struct dentry *realdentry = ovl_entry_real(oe, &is_upper); - struct inode *realinode; + struct inode *realinode = ovl_inode_real(inode, &is_upper); const struct cred *old_cred; int err; /* Careful in RCU walk mode */ - realinode = d_inode_rcu(realdentry); if (!realinode) { WARN_ON(!(mask & MAY_NOT_BLOCK)); return -ECHILD; @@ -312,7 +309,7 @@ out: struct posix_acl *ovl_get_acl(struct inode *inode, int type) { - struct inode *realinode = ovl_inode_real(inode); + struct inode *realinode = ovl_inode_real(inode, NULL); const struct cred *old_cred; struct posix_acl *acl; @@ -412,8 +409,7 @@ static const struct inode_operations ovl_symlink_inode_operations = { .update_time = ovl_update_time, }; -struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, - struct ovl_entry *oe) +struct inode *ovl_new_inode(struct super_block *sb, umode_t mode) { struct inode *inode; @@ -424,7 +420,6 @@ struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, inode->i_ino = get_next_ino(); inode->i_mode = mode; inode->i_flags |= S_NOCMTIME; - inode->i_private = oe; mode &= S_IFMT; switch (mode) { |