path: root/fs/overlayfs/overlayfs.h
diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2020-02-04 11:45:21 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-04 11:45:21 +0000
commit7f879e1a94ac99586abf0659c03f35c1e48279c4 (patch)
treecf11e7944a7836bb6121f0fa4f3ba47d20d7eafb /fs/overlayfs/overlayfs.h
parentMerge tag 'rproc-v5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc (diff)
parentovl: fix lseek overflow on 32bit (diff)
Merge tag 'ovl-update-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs update from Miklos Szeredi: - Try to preserve holes in sparse files when copying up, thus saving disk space and improving performance. - Fix a performance regression introduced in v4.19 by preserving asynchronicity of IO when fowarding to underlying layers. Add VFS helpers to submit async iocbs. - Fix a regression in lseek(2) introduced in v4.19 that breaks >2G seeks on 32bit kernels. - Fix a corner case where st_ino/st_dev was not preserved across copy up. - Miscellaneous fixes and cleanups. * tag 'ovl-update-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: ovl: fix lseek overflow on 32bit ovl: add splice file read write helper ovl: implement async IO routines vfs: add vfs_iocb_iter_[read|write] helper functions ovl: layer is const ovl: fix corner case of non-constant st_dev;st_ino ovl: fix corner case of conflicting lower layer uuid ovl: generalize the lower_fs[] array ovl: simplify ovl_same_sb() helper ovl: generalize the lower_layers[] array ovl: improving copy-up efficiency for big sparse file ovl: use ovl_inode_lock in ovl_llseek() ovl: use pr_fmt auto generate prefix ovl: fix wrong WARN_ON() in ovl_cache_update_ino()
Diffstat (limited to 'fs/overlayfs/overlayfs.h')
1 files changed, 19 insertions, 5 deletions
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index f283b1d69a9e..3623d28aa4fa 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -9,6 +9,9 @@
#include <linux/fs.h>
#include "ovl_entry.h"
+#undef pr_fmt
+#define pr_fmt(fmt) "overlayfs: " fmt
enum ovl_path_type {
__OVL_PATH_UPPER = (1 << 0),
__OVL_PATH_MERGE = (1 << 1),
@@ -221,7 +224,6 @@ int ovl_want_write(struct dentry *dentry);
void ovl_drop_write(struct dentry *dentry);
struct dentry *ovl_workdir(struct dentry *dentry);
const struct cred *ovl_override_creds(struct super_block *sb);
-struct super_block *ovl_same_sb(struct super_block *sb);
int ovl_can_decode_fh(struct super_block *sb);
struct dentry *ovl_indexdir(struct super_block *sb);
bool ovl_index_all(struct super_block *sb);
@@ -237,7 +239,7 @@ enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
struct dentry *ovl_dentry_upper(struct dentry *dentry);
struct dentry *ovl_dentry_lower(struct dentry *dentry);
struct dentry *ovl_dentry_lowerdata(struct dentry *dentry);
-struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
+const struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
struct dentry *ovl_dentry_real(struct dentry *dentry);
struct dentry *ovl_i_dentry_upper(struct inode *inode);
struct inode *ovl_inode_upper(struct inode *inode);
@@ -299,11 +301,21 @@ static inline bool ovl_is_impuredir(struct dentry *dentry)
return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE);
-static inline unsigned int ovl_xino_bits(struct super_block *sb)
+/* All layers on same fs? */
+static inline bool ovl_same_fs(struct super_block *sb)
+ return OVL_FS(sb)->xino_mode == 0;
+/* All overlay inodes have same st_dev? */
+static inline bool ovl_same_dev(struct super_block *sb)
- struct ovl_fs *ofs = sb->s_fs_info;
+ return OVL_FS(sb)->xino_mode >= 0;
- return ofs->xino_bits;
+static inline unsigned int ovl_xino_bits(struct super_block *sb)
+ return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0;
static inline int ovl_inode_lock(struct inode *inode)
@@ -438,6 +450,8 @@ struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr);
/* file.c */
extern const struct file_operations ovl_file_operations;
+int __init ovl_aio_request_cache_init(void);
+void ovl_aio_request_cache_destroy(void);
/* copy_up.c */
int ovl_copy_up(struct dentry *dentry);