From 1afaba1ecb5299cdd0f69b5bad98b0185fe71e79 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Sat, 13 Dec 2014 00:59:42 +0100 Subject: ovl: make path-type a bitmap OVL_PATH_PURE_UPPER -> __OVL_PATH_UPPER | __OVL_PATH_PURE OVL_PATH_UPPER -> __OVL_PATH_UPPER OVL_PATH_MERGE -> __OVL_PATH_UPPER | __OVL_PATH_MERGE OVL_PATH_LOWER -> 0 Multiple R/O layers will allow __OVL_PATH_MERGE without __OVL_PATH_UPPER. Signed-off-by: Miklos Szeredi --- fs/overlayfs/inode.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'fs/overlayfs/inode.c') diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 07d74b24913..48492f1240a 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -238,7 +238,10 @@ out: static bool ovl_need_xattr_filter(struct dentry *dentry, enum ovl_path_type type) { - return type == OVL_PATH_UPPER && S_ISDIR(dentry->d_inode->i_mode); + if ((type & (__OVL_PATH_PURE | __OVL_PATH_UPPER)) == __OVL_PATH_UPPER) + return S_ISDIR(dentry->d_inode->i_mode); + else + return false; } ssize_t ovl_getxattr(struct dentry *dentry, const char *name, @@ -299,7 +302,7 @@ int ovl_removexattr(struct dentry *dentry, const char *name) if (ovl_need_xattr_filter(dentry, type) && ovl_is_private_xattr(name)) goto out_drop_write; - if (type == OVL_PATH_LOWER) { + if (!OVL_TYPE_UPPER(type)) { err = vfs_getxattr(realpath.dentry, name, NULL, 0); if (err < 0) goto out_drop_write; @@ -321,7 +324,7 @@ out: static bool ovl_open_need_copy_up(int flags, enum ovl_path_type type, struct dentry *realdentry) { - if (type != OVL_PATH_LOWER) + if (OVL_TYPE_UPPER(type)) return false; if (special_file(realdentry->d_inode->i_mode)) -- cgit v1.2.3-70-g09d2 From 1ba38725a351f91769918b132c17fb7fcaf6c2f5 Mon Sep 17 00:00:00 2001 From: hujianyang Date: Wed, 26 Nov 2014 16:16:59 +0800 Subject: ovl: Cleanup redundant blank lines This patch removes redundant blanks lines in overlayfs. Signed-off-by: hujianyang Signed-off-by: Miklos Szeredi --- fs/overlayfs/copy_up.c | 1 - fs/overlayfs/inode.c | 1 - fs/overlayfs/super.c | 1 - 3 files changed, 3 deletions(-) (limited to 'fs/overlayfs/inode.c') diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index a5bfd60f4f6..24f640441bd 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -191,7 +191,6 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat) ovl_set_timestamps(upperdentry, stat); return err; - } static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 48492f1240a..5ac1236afb1 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -433,5 +433,4 @@ struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, } return inode; - } diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 5c495a17a5a..e9ce4a9e874 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -106,7 +106,6 @@ void ovl_path_upper(struct dentry *dentry, struct path *path) enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path) { - enum ovl_path_type type = ovl_path_type(dentry); if (!OVL_TYPE_UPPER(type)) -- cgit v1.2.3-70-g09d2 From cead89bb08c0f64e23886f1c18df9bb98e97c55c Mon Sep 17 00:00:00 2001 From: hujianyang Date: Mon, 24 Nov 2014 18:25:21 +0800 Subject: ovl: Use macros to present ovl_xattr This patch adds two macros: OVL_XATTR_PRE_NAME and OVL_XATTR_PRE_LEN to present ovl_xattr name prefix and its length. Also, a new macro OVL_XATTR_OPAQUE is introduced to replace old *ovl_opaque_xattr*. Fix the length of "trusted.overlay." to *16*. Signed-off-by: hujianyang Signed-off-by: Miklos Szeredi --- fs/overlayfs/dir.c | 4 ++-- fs/overlayfs/inode.c | 2 +- fs/overlayfs/overlayfs.h | 4 +++- fs/overlayfs/super.c | 4 +--- 4 files changed, 7 insertions(+), 7 deletions(-) (limited to 'fs/overlayfs/inode.c') diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index dcae3ac5aa7..0dc4c33a0a1 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -118,14 +118,14 @@ int ovl_create_real(struct inode *dir, struct dentry *newdentry, static int ovl_set_opaque(struct dentry *upperdentry) { - return ovl_do_setxattr(upperdentry, ovl_opaque_xattr, "y", 1, 0); + return ovl_do_setxattr(upperdentry, OVL_XATTR_OPAQUE, "y", 1, 0); } static void ovl_remove_opaque(struct dentry *upperdentry) { int err; - err = ovl_do_removexattr(upperdentry, ovl_opaque_xattr); + err = ovl_do_removexattr(upperdentry, OVL_XATTR_OPAQUE); if (err) { pr_warn("overlayfs: failed to remove opaque from '%s' (%i)\n", upperdentry->d_name.name, err); diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 5ac1236afb1..04f12488468 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -205,7 +205,7 @@ static int ovl_readlink(struct dentry *dentry, char __user *buf, int bufsiz) static bool ovl_is_private_xattr(const char *name) { - return strncmp(name, "trusted.overlay.", 14) == 0; + return strncmp(name, OVL_XATTR_PRE_NAME, OVL_XATTR_PRE_LEN) == 0; } int ovl_setxattr(struct dentry *dentry, const char *name, diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index d176b679f52..17ac5afc9ff 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -23,7 +23,9 @@ enum ovl_path_type { #define OVL_TYPE_MERGE_OR_LOWER(type) \ (OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type)) -extern const char *ovl_opaque_xattr; +#define OVL_XATTR_PRE_NAME "trusted.overlay." +#define OVL_XATTR_PRE_LEN 16 +#define OVL_XATTR_OPAQUE OVL_XATTR_PRE_NAME"opaque" static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) { diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index e9ce4a9e874..84f3144e1b3 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -62,8 +62,6 @@ struct ovl_entry { #define OVL_MAX_STACK 500 -const char *ovl_opaque_xattr = "trusted.overlay.opaque"; - static struct dentry *__ovl_dentry_lower(struct ovl_entry *oe) { return oe->numlower ? oe->lowerstack[0].dentry : NULL; @@ -254,7 +252,7 @@ static bool ovl_is_opaquedir(struct dentry *dentry) if (!S_ISDIR(inode->i_mode) || !inode->i_op->getxattr) return false; - res = inode->i_op->getxattr(dentry, ovl_opaque_xattr, &val, 1); + res = inode->i_op->getxattr(dentry, OVL_XATTR_OPAQUE, &val, 1); if (res == 1 && val == 'y') return true; -- cgit v1.2.3-70-g09d2