diff options
author | Miklos Szeredi <mszeredi@redhat.com> | 2017-11-09 10:23:28 +0100 |
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committer | Miklos Szeredi <mszeredi@redhat.com> | 2017-11-09 10:23:28 +0100 |
commit | 8ed61dc37ee0a33c7581d38d16977a5d1897de9f (patch) | |
tree | b3812772ef3936d9695e25c7cc1c5d2ad2bc95b6 /fs/overlayfs/super.c | |
parent | 21a3b317a60197b19c8f67e8016b633942e36bbf (diff) |
ovl: split out ovl_get_workdir() from ovl_fill_super()
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/super.c')
-rw-r--r-- | fs/overlayfs/super.c | 111 |
1 files changed, 60 insertions, 51 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 21f93cd5782f..aadd07a1e9c1 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -912,6 +912,63 @@ static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath) 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, 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; - ufs->workdir = ovl_workdir_create(sb, ufs, workpath.dentry, - OVL_WORKDIR_NAME, false); - /* - * 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 = ovl_get_workdir(sb, ufs, &workpath); + if (err) + goto out_put_workdir; } err = -ENOMEM; |