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ovl: mark upper merge dir with type origin entries "impure" 

An upper dir is marked "impure" to let ovl_iterate() know that this
directory may contain non pure upper entries whose d_ino may need to be
read from the origin inode.

We already mark a non-merge dir "impure" when moving a non-pure child
entry inside it, to let ovl_iterate() know not to iterate the non-merge
dir directly.

Mark also a merge dir "impure" when moving a non-pure child entry inside
it and when copying up a child entry inside it.

This can be used to optimize ovl_iterate() to perform a "pure merge" of
upper and lower directories, merging the content of the directories,
without having to read d_ino from origin inodes.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
hifive-unleashed-5.1
Amir Goldstein 2017-05-24 15:29:33 +03:00 committed by Miklos Szeredi
parent ee1d6d37b6
commit f3a1568582
6 changed files with 60 additions and 58 deletions
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5
fs/overlayfs/copy_up.c
View File

@ -459,6 +459,11 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
ovl_path_upper(parent, &parentpath);
upperdir = parentpath.dentry;
/* Mark parent "impure" because it may now contain non-pure upper */
err = ovl_set_impure(parent, upperdir);
if (err)
return err;
err = vfs_getattr(&parentpath, &pstat,
STATX_ATIME | STATX_MTIME, AT_STATX_SYNC_AS_STAT);
if (err)

31
fs/overlayfs/dir.c
View File

@ -149,22 +149,6 @@ static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
}
static int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry)
{
int err;
/*
* Do not fail when upper doesn't support xattrs.
* Upper inodes won't have origin nor redirect xattr anyway.
*/
err = ovl_check_setxattr(dentry, upperdentry, OVL_XATTR_IMPURE,
"y", 1, 0);
if (!err)
ovl_dentry_set_impure(dentry);
return err;
}
/* Common operations required to be done after creation of file on upper */
static void ovl_instantiate(struct dentry *dentry, struct inode *inode,
struct dentry *newdentry, bool hardlink)
@ -976,21 +960,16 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
if (!samedir) {
/*
* When moving a merge dir or non-dir with copy up origin into
* a non-merge upper dir (a.k.a pure upper dir), we are making
* the target parent dir "impure". ovl_iterate() iterates pure
* upper dirs directly, because there is no need to filter out
* whiteouts and merge dir content with lower dir. But for the
* case of an "impure" upper dir, ovl_iterate() cannot iterate
* the real directory directly, because it looks for the inode
* numbers to fill d_ino in the entries origin inode.
* a new parent, we are marking the new parent dir "impure".
* When ovl_iterate() iterates an "impure" upper dir, it will
* lookup the origin inodes of the entries to fill d_ino.
*/
if (ovl_type_origin(old) && !ovl_type_merge(new->d_parent)) {
if (ovl_type_origin(old)) {
err = ovl_set_impure(new->d_parent, new_upperdir);
if (err)
goto out_revert_creds;
}
if (!overwrite && ovl_type_origin(new) &&
!ovl_type_merge(old->d_parent)) {
if (!overwrite && ovl_type_origin(new)) {
err = ovl_set_impure(old->d_parent, old_upperdir);
if (err)
goto out_revert_creds;

20
fs/overlayfs/namei.c
View File

@ -167,31 +167,11 @@ invalid:
goto out;
}
static bool ovl_check_dir_xattr(struct dentry *dentry, const char *name)
{
int res;
char val;
if (!d_is_dir(dentry))
return false;
res = vfs_getxattr(dentry, name, &val, 1);
if (res == 1 && val == 'y')
return true;
return false;
}
static bool ovl_is_opaquedir(struct dentry *dentry)
{
return ovl_check_dir_xattr(dentry, OVL_XATTR_OPAQUE);
}
static bool ovl_is_impuredir(struct dentry *dentry)
{
return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE);
}
static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d,
const char *name, unsigned int namelen,
size_t prelen, const char *post,

15
fs/overlayfs/overlayfs.h
View File

@ -207,7 +207,6 @@ bool ovl_dentry_is_opaque(struct dentry *dentry);
bool ovl_dentry_is_impure(struct dentry *dentry);
bool ovl_dentry_is_whiteout(struct dentry *dentry);
void ovl_dentry_set_opaque(struct dentry *dentry);
void ovl_dentry_set_impure(struct dentry *dentry);
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);
@ -221,6 +220,17 @@ bool ovl_is_whiteout(struct dentry *dentry);
struct file *ovl_path_open(struct path *path, int flags);
int ovl_copy_up_start(struct dentry *dentry);
void ovl_copy_up_end(struct dentry *dentry);
bool ovl_check_dir_xattr(struct dentry *dentry, const char *name);
int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
const char *name, const void *value, size_t size,
int xerr);
int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
static inline bool ovl_is_impuredir(struct dentry *dentry)
{
return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE);
}
/* namei.c */
int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
@ -281,6 +291,3 @@ int ovl_copy_up(struct dentry *dentry);
int ovl_copy_up_flags(struct dentry *dentry, int flags);
int ovl_copy_xattr(struct dentry *old, struct dentry *new);
int ovl_set_attr(struct dentry *upper, struct kstat *stat);
int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
const char *name, const void *value, size_t size,
int xerr);

5
fs/overlayfs/super.c
View File

@ -974,7 +974,10 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
path_put(&workpath);
kfree(lowertmp);
oe->__upperdentry = upperpath.dentry;
if (upperpath.dentry) {
oe->__upperdentry = upperpath.dentry;
oe->impure = ovl_is_impuredir(upperpath.dentry);
}
for (i = 0; i < numlower; i++) {
oe->lowerstack[i].dentry = stack[i].dentry;
oe->lowerstack[i].mnt = ufs->lower_mnt[i];

42
fs/overlayfs/util.c
View File

@ -194,13 +194,6 @@ void ovl_dentry_set_opaque(struct dentry *dentry)
oe->opaque = true;
}
void ovl_dentry_set_impure(struct dentry *dentry)
{
struct ovl_entry *oe = dentry->d_fsdata;
oe->impure = true;
}
bool ovl_redirect_dir(struct super_block *sb)
{
struct ovl_fs *ofs = sb->s_fs_info;
@ -311,6 +304,21 @@ void ovl_copy_up_end(struct dentry *dentry)
spin_unlock(&ofs->copyup_wq.lock);
}
bool ovl_check_dir_xattr(struct dentry *dentry, const char *name)
{
int res;
char val;
if (!d_is_dir(dentry))
return false;
res = vfs_getxattr(dentry, name, &val, 1);
if (res == 1 && val == 'y')
return true;
return false;
}
int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
const char *name, const void *value, size_t size,
int xerr)
@ -331,3 +339,23 @@ int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
return err;
}
int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry)
{
int err;
struct ovl_entry *oe = dentry->d_fsdata;
if (oe->impure)
return 0;
/*
* Do not fail when upper doesn't support xattrs.
* Upper inodes won't have origin nor redirect xattr anyway.
*/
err = ovl_check_setxattr(dentry, upperdentry, OVL_XATTR_IMPURE,
"y", 1, 0);
if (!err)
oe->impure = true;
return err;
}