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ovl: abstract ovl_inode lock with a helper 

The abstraction improves code readabilty (to some).

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2018-10-18 18:37:14 +03:00 committed by Miklos Szeredi
parent 0e32992f7f
commit 1e92e3072c
2 changed files with 23 additions and 12 deletions
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10
fs/overlayfs/overlayfs.h
View File

@ -290,6 +290,16 @@ static inline unsigned int ovl_xino_bits(struct super_block *sb)
return ofs->xino_bits;
}
static inline int ovl_inode_lock(struct inode *inode)
{
return mutex_lock_interruptible(&OVL_I(inode)->lock);
}
static inline void ovl_inode_unlock(struct inode *inode)
{
mutex_unlock(&OVL_I(inode)->lock);
}
/* namei.c */
int ovl_check_fh_len(struct ovl_fh *fh, int fh_len);

25
fs/overlayfs/util.c
View File

@ -521,13 +521,13 @@ bool ovl_already_copied_up(struct dentry *dentry, int flags)
int ovl_copy_up_start(struct dentry *dentry, int flags)
{
struct ovl_inode *oi = OVL_I(d_inode(dentry));
struct inode *inode = d_inode(dentry);
int err;
err = mutex_lock_interruptible(&oi->lock);
err = ovl_inode_lock(inode);
if (!err && ovl_already_copied_up_locked(dentry, flags)) {
err = 1; /* Already copied up */
mutex_unlock(&oi->lock);
ovl_inode_unlock(inode);
}
return err;
@ -535,7 +535,7 @@ int ovl_copy_up_start(struct dentry *dentry, int flags)
void ovl_copy_up_end(struct dentry *dentry)
{
mutex_unlock(&OVL_I(d_inode(dentry))->lock);
ovl_inode_unlock(d_inode(dentry));
}
bool ovl_check_origin_xattr(struct dentry *dentry)
@ -740,11 +740,11 @@ fail:
*/
int ovl_nlink_start(struct dentry *dentry)
{
struct ovl_inode *oi = OVL_I(d_inode(dentry));
struct inode *inode = d_inode(dentry);
const struct cred *old_cred;
int err;
if (WARN_ON(!d_inode(dentry)))
if (WARN_ON(!inode))
return -ENOENT;
/*
@ -767,11 +767,11 @@ int ovl_nlink_start(struct dentry *dentry)
return err;
}
err = mutex_lock_interruptible(&oi->lock);
err = ovl_inode_lock(inode);
if (err)
return err;
if (d_is_dir(dentry) || !ovl_test_flag(OVL_INDEX, d_inode(dentry)))
if (d_is_dir(dentry) || !ovl_test_flag(OVL_INDEX, inode))
goto out;
old_cred = ovl_override_creds(dentry->d_sb);
@ -786,15 +786,16 @@ int ovl_nlink_start(struct dentry *dentry)
out:
if (err)
mutex_unlock(&oi->lock);
ovl_inode_unlock(inode);
return err;
}
void ovl_nlink_end(struct dentry *dentry)
{
if (ovl_test_flag(OVL_INDEX, d_inode(dentry)) &&
d_inode(dentry)->i_nlink == 0) {
struct inode *inode = d_inode(dentry);
if (ovl_test_flag(OVL_INDEX, inode) && inode->i_nlink == 0) {
const struct cred *old_cred;
old_cred = ovl_override_creds(dentry->d_sb);
@ -802,7 +803,7 @@ void ovl_nlink_end(struct dentry *dentry)
revert_creds(old_cred);
}
mutex_unlock(&OVL_I(d_inode(dentry))->lock);
ovl_inode_unlock(inode);
}
int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir)