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ovl: simplify getting inode 

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2017-07-04 22:03:16 +02:00
parent 13cf199d00
commit e6d2ebddbc
5 changed files with 39 additions and 40 deletions
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28
fs/overlayfs/inode.c
View File

@ -462,18 +462,28 @@ static int ovl_inode_set(struct inode *inode, void *data)
return 0;
}
struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode)
struct inode *ovl_get_inode(struct dentry *dentry)
{
struct dentry *upperdentry = ovl_dentry_upper(dentry);
struct inode *realinode = d_inode(ovl_dentry_real(dentry));
struct inode *inode;
inode = iget5_locked(sb, (unsigned long) realinode,
ovl_inode_test, ovl_inode_set, realinode);
if (inode && inode->i_state & I_NEW) {
ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev);
set_nlink(inode, realinode->i_nlink);
unlock_new_inode(inode);
}
if (upperdentry && !d_is_dir(upperdentry)) {
inode = iget5_locked(dentry->d_sb, (unsigned long) realinode,
ovl_inode_test, ovl_inode_set, realinode);
if (!inode || !(inode->i_state & I_NEW))
goto out;
set_nlink(inode, realinode->i_nlink);
} else {
inode = new_inode(dentry->d_sb);
if (!inode)
goto out;
}
ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev);
ovl_inode_init(inode, dentry);
if (inode->i_state & I_NEW)
unlock_new_inode(inode);
out:
return inode;
}

34
fs/overlayfs/namei.c
View File

@ -433,41 +433,29 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
if (!oe)
goto out_put;
if (upperdentry || ctr) {
struct dentry *realdentry;
struct inode *realinode;
realdentry = upperdentry ? upperdentry : stack[0].dentry;
realinode = d_inode(realdentry);
err = -ENOMEM;
if (upperdentry && !d_is_dir(upperdentry)) {
inode = ovl_get_inode(dentry->d_sb, realinode);
} else {
inode = ovl_new_inode(dentry->d_sb, realinode->i_mode,
realinode->i_rdev);
if (inode)
ovl_inode_init(inode, realinode, !!upperdentry);
}
if (!inode)
goto out_free_oe;
ovl_copyattr(realdentry->d_inode, inode);
}
revert_creds(old_cred);
oe->opaque = upperopaque;
oe->impure = upperimpure;
oe->redirect = upperredirect;
oe->__upperdentry = upperdentry;
memcpy(oe->lowerstack, stack, sizeof(struct path) * ctr);
dentry->d_fsdata = oe;
if (upperdentry || ctr) {
err = -ENOMEM;
inode = ovl_get_inode(dentry);
if (!inode)
goto out_free_oe;
}
revert_creds(old_cred);
kfree(stack);
kfree(d.redirect);
dentry->d_fsdata = oe;
d_add(dentry, inode);
return NULL;
out_free_oe:
dentry->d_fsdata = NULL;
kfree(oe);
out_put:
for (i = 0; i < ctr; i++)

5
fs/overlayfs/overlayfs.h
View File

@ -211,8 +211,7 @@ bool ovl_redirect_dir(struct super_block *sb);
const char *ovl_dentry_get_redirect(struct dentry *dentry);
void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
void ovl_inode_init(struct inode *inode, struct inode *realinode,
bool is_upper);
void ovl_inode_init(struct inode *inode, struct dentry *dentry);
void ovl_inode_update(struct inode *inode, struct inode *upperinode);
void ovl_dentry_version_inc(struct dentry *dentry);
u64 ovl_dentry_version_get(struct dentry *dentry);
@ -262,7 +261,7 @@ int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
bool ovl_is_private_xattr(const char *name);
struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode);
struct inode *ovl_get_inode(struct dentry *dentry);
static inline void ovl_copyattr(struct inode *from, struct inode *to)
{
to->i_uid = from->i_uid;

5
fs/overlayfs/super.c
View File

@ -757,7 +757,6 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
struct path upperpath = { };
struct path workpath = { };
struct dentry *root_dentry;
struct inode *realinode;
struct ovl_entry *oe;
struct ovl_fs *ufs;
struct path *stack = NULL;
@ -1009,9 +1008,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
root_dentry->d_fsdata = oe;
realinode = d_inode(ovl_dentry_real(root_dentry));
ovl_inode_init(d_inode(root_dentry), realinode, !!upperpath.dentry);
ovl_copyattr(realinode, d_inode(root_dentry));
ovl_inode_init(d_inode(root_dentry), root_dentry);
sb->s_root = root_dentry;

7
fs/overlayfs/util.c
View File

@ -230,10 +230,15 @@ void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry)
oe->__upperdentry = upperdentry;
}
void ovl_inode_init(struct inode *inode, struct inode *realinode, bool is_upper)
void ovl_inode_init(struct inode *inode, struct dentry *dentry)
{
struct inode *realinode = d_inode(ovl_dentry_real(dentry));
bool is_upper = ovl_dentry_upper(dentry);
WRITE_ONCE(inode->i_private, (unsigned long) realinode |
(is_upper ? OVL_ISUPPER_MASK : 0));
ovl_copyattr(realinode, inode);
}
void ovl_inode_update(struct inode *inode, struct inode *upperinode)