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ovl: split out ovl_get_workdir() from ovl_fill_super() 

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2017-11-09 10:23:28 +01:00
parent 21a3b317a6
commit 8ed61dc37e
1 changed files with 60 additions and 51 deletions
fs/overlayfs
super.c

111
fs/overlayfs/super.c
View File

@ -912,6 +912,63 @@ static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath)
return 0; return 0;
} }
static int ovl_get_workdir(struct super_block *sb, struct ovl_fs *ufs,
struct path *workpath)
{
struct dentry *temp;
int err;
ufs->workdir = ovl_workdir_create(sb, ufs, workpath->dentry,
OVL_WORKDIR_NAME, false);
if (!ufs->workdir)
return 0;
/*
* Upper should support d_type, else whiteouts are visible. Given
* workdir and upper are on same fs, we can do iterate_dir() on
* workdir. This check requires successful creation of workdir in
* previous step.
*/
err = ovl_check_d_type_supported(workpath);
if (err < 0)
return err;
/*
* We allowed this configuration and don't want to break users over
* kernel upgrade. So warn instead of erroring out.
*/
if (!err)
pr_warn("overlayfs: upper fs needs to support d_type.\n");
/* Check if upper/work fs supports O_TMPFILE */
temp = ovl_do_tmpfile(ufs->workdir, S_IFREG | 0);
ufs->tmpfile = !IS_ERR(temp);
if (ufs->tmpfile)
dput(temp);
else
pr_warn("overlayfs: upper fs does not support tmpfile.\n");
/*
* Check if upper/work fs supports trusted.overlay.* xattr
*/
err = ovl_do_setxattr(ufs->workdir, OVL_XATTR_OPAQUE, "0", 1, 0);
if (err) {
ufs->noxattr = true;
pr_warn("overlayfs: upper fs does not support xattr.\n");
} else {
vfs_removexattr(ufs->workdir, OVL_XATTR_OPAQUE);
}
/* Check if upper/work fs supports file handles */
if (ufs->config.index &&
!ovl_can_decode_fh(ufs->workdir->d_sb)) {
ufs->config.index = false;
pr_warn("overlayfs: upper fs does not support file handles, falling back to index=off.\n");
}
return 0;
}
static int ovl_get_lowerstack(struct super_block *sb, struct ovl_fs *ufs, static int ovl_get_lowerstack(struct super_block *sb, struct ovl_fs *ufs,
struct path **stackp, unsigned int *stacklenp) struct path **stackp, unsigned int *stacklenp)
{ {
@ -1041,57 +1098,9 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_time_gran = ufs->upper_mnt->mnt_sb->s_time_gran; sb->s_time_gran = ufs->upper_mnt->mnt_sb->s_time_gran;
ufs->workdir = ovl_workdir_create(sb, ufs, workpath.dentry, err = ovl_get_workdir(sb, ufs, &workpath);
OVL_WORKDIR_NAME, false); if (err)
/* goto out_put_workdir;
* Upper should support d_type, else whiteouts are visible.
* Given workdir and upper are on same fs, we can do
* iterate_dir() on workdir. This check requires successful
* creation of workdir in previous step.
*/
if (ufs->workdir) {
struct dentry *temp;
err = ovl_check_d_type_supported(&workpath);
if (err < 0)
goto out_put_workdir;
/*
* We allowed this configuration and don't want to
* break users over kernel upgrade. So warn instead
* of erroring out.
*/
if (!err)
pr_warn("overlayfs: upper fs needs to support d_type.\n");
/* Check if upper/work fs supports O_TMPFILE */
temp = ovl_do_tmpfile(ufs->workdir, S_IFREG | 0);
ufs->tmpfile = !IS_ERR(temp);
if (ufs->tmpfile)
dput(temp);
else
pr_warn("overlayfs: upper fs does not support tmpfile.\n");
/*
* Check if upper/work fs supports trusted.overlay.*
* xattr
*/
err = ovl_do_setxattr(ufs->workdir, OVL_XATTR_OPAQUE,
"0", 1, 0);
if (err) {
ufs->noxattr = true;
pr_warn("overlayfs: upper fs does not support xattr.\n");
} else {
vfs_removexattr(ufs->workdir, OVL_XATTR_OPAQUE);
}
/* Check if upper/work fs supports file handles */
if (ufs->config.index &&
!ovl_can_decode_fh(ufs->workdir->d_sb)) {
ufs->config.index = false;
pr_warn("overlayfs: upper fs does not support file handles, falling back to index=off.\n");
}
}
} }
err = -ENOMEM; err = -ENOMEM;