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ovl: consistent i_ino for non-samefs with xino

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When overlay layers are not all on the same fs, but all inode numbers
of underlying fs do not use the high 'xino' bits, overlay st_ino values
are constant and persistent.

In that case, set i_ino value to the same value as st_ino for nfsd
readdirplus validator.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2018-03-16 10:39:37 +02:00 committed by Miklos Szeredi
parent e487d889b7
commit 12574a9f4c
4 changed files with 21 additions and 14 deletions
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2
fs/overlayfs/export.c
View File

@ -305,7 +305,7 @@ static struct dentry *ovl_obtain_alias(struct super_block *sb,
if (d_is_dir(upper ?: lower))
return ERR_PTR(-EIO);
inode = ovl_get_inode(sb, dget(upper), lower, index, !!lower);
inode = ovl_get_inode(sb, dget(upper), lowerpath, index, !!lower);
if (IS_ERR(inode)) {
dput(upper);
return ERR_CAST(inode);

27
fs/overlayfs/inode.c
View File

@ -489,19 +489,26 @@ static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode)
}
static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev,
unsigned long ino)
unsigned long ino, int fsid)
{
int xinobits = ovl_xino_bits(inode->i_sb);
/*
* When NFS export is enabled and d_ino is consistent with st_ino
* (samefs), set the same value to i_ino, because nfsd readdirplus
* compares d_ino values to i_ino values of child entries. When called
* from ovl_new_inode(), ino arg is 0, so i_ino will be updated to real
* (samefs or i_ino has enough bits to encode layer), set the same
* value used for d_ino to i_ino, because nfsd readdirplus compares
* d_ino values to i_ino values of child entries. When called from
* ovl_new_inode(), ino arg is 0, so i_ino will be updated to real
* upper inode i_ino on ovl_inode_init() or ovl_inode_update().
*/
if (inode->i_sb->s_export_op && ovl_same_sb(inode->i_sb))
if (inode->i_sb->s_export_op &&
(ovl_same_sb(inode->i_sb) || xinobits)) {
inode->i_ino = ino;
else
if (xinobits && fsid && !(ino >> (64 - xinobits)))
inode->i_ino |= (unsigned long)fsid << (64 - xinobits);
} else {
inode->i_ino = get_next_ino();
}
inode->i_mode = mode;
inode->i_flags |= S_NOCMTIME;
#ifdef CONFIG_FS_POSIX_ACL
@ -637,7 +644,7 @@ struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev)
inode = new_inode(sb);
if (inode)
ovl_fill_inode(inode, mode, rdev, 0);
ovl_fill_inode(inode, mode, rdev, 0, 0);
return inode;
}
@ -743,12 +750,14 @@ static bool ovl_hash_bylower(struct super_block *sb, struct dentry *upper,
}
struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
struct dentry *lowerdentry, struct dentry *index,
struct ovl_path *lowerpath, struct dentry *index,
unsigned int numlower)
{
struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
struct inode *inode;
struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL;
bool bylower = ovl_hash_bylower(sb, upperdentry, lowerdentry, index);
int fsid = bylower ? lowerpath->layer->fsid : 0;
bool is_dir;
unsigned long ino = 0;
@ -796,7 +805,7 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
if (!inode)
goto out_nomem;
}
ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino);
ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino, fsid);
ovl_inode_init(inode, upperdentry, lowerdentry);
if (upperdentry && ovl_is_impuredir(upperdentry))

4
fs/overlayfs/namei.c
View File

@ -1004,9 +1004,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
upperdentry = dget(index);
if (upperdentry || ctr) {
if (ctr)
origin = stack[0].dentry;
inode = ovl_get_inode(dentry->d_sb, upperdentry, origin, index,
inode = ovl_get_inode(dentry->d_sb, upperdentry, stack, index,
ctr);
err = PTR_ERR(inode);
if (IS_ERR(inode))

2
fs/overlayfs/overlayfs.h
View File

@ -338,7 +338,7 @@ struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
bool is_upper);
struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
struct dentry *lowerdentry, struct dentry *index,
struct ovl_path *lowerpath, struct dentry *index,
unsigned int numlower);
static inline void ovl_copyattr(struct inode *from, struct inode *to)
{