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ovl: pass ovl_fs to xino helpers

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Internal ovl methods should use ovl_fs and not sb as much as
possible.

Use a constant_table to translate from enum xino mode to string
in preperation for new mount api option parsing.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
Amir Goldstein 2023-05-25 08:40:54 +03:00
parent 367d002d6c
commit dcb399de1e
4 changed files with 43 additions and 31 deletions
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18
fs/overlayfs/inode.c
View File

@ -97,8 +97,9 @@ int ovl_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
static void ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
{
bool samefs = ovl_same_fs(dentry->d_sb);
unsigned int xinobits = ovl_xino_bits(dentry->d_sb);
struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
bool samefs = ovl_same_fs(ofs);
unsigned int xinobits = ovl_xino_bits(ofs);
unsigned int xinoshift = 64 - xinobits;
if (samefs) {
@ -123,7 +124,7 @@ static void ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
stat->ino |= ((u64)fsid) << (xinoshift + 1);
stat->dev = dentry->d_sb->s_dev;
return;
} else if (ovl_xino_warn(dentry->d_sb)) {
} else if (ovl_xino_warn(ofs)) {
pr_warn_ratelimited("inode number too big (%pd2, ino=%llu, xinobits=%d)\n",
dentry, stat->ino, xinobits);
}
@ -149,7 +150,7 @@ static void ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
* is unique per underlying fs, so we use the unique anonymous
* bdev assigned to the underlying fs.
*/
stat->dev = OVL_FS(dentry->d_sb)->fs[fsid].pseudo_dev;
stat->dev = ofs->fs[fsid].pseudo_dev;
}
}
@ -186,7 +187,7 @@ int ovl_getattr(struct mnt_idmap *idmap, const struct path *path,
* If lower filesystem supports NFS file handles, this also guaranties
* persistent st_ino across mount cycle.
*/
if (!is_dir || ovl_same_dev(dentry->d_sb)) {
if (!is_dir || ovl_same_dev(OVL_FS(dentry->d_sb))) {
if (!OVL_TYPE_UPPER(type)) {
fsid = ovl_layer_lower(dentry)->fsid;
} else if (OVL_TYPE_ORIGIN(type)) {
@ -961,7 +962,7 @@ static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode)
static void ovl_next_ino(struct inode *inode)
{
struct ovl_fs *ofs = inode->i_sb->s_fs_info;
struct ovl_fs *ofs = OVL_FS(inode->i_sb);
inode->i_ino = atomic_long_inc_return(&ofs->last_ino);
if (unlikely(!inode->i_ino))
@ -970,7 +971,8 @@ static void ovl_next_ino(struct inode *inode)
static void ovl_map_ino(struct inode *inode, unsigned long ino, int fsid)
{
int xinobits = ovl_xino_bits(inode->i_sb);
struct ovl_fs *ofs = OVL_FS(inode->i_sb);
int xinobits = ovl_xino_bits(ofs);
unsigned int xinoshift = 64 - xinobits;
/*
@ -981,7 +983,7 @@ static void ovl_map_ino(struct inode *inode, unsigned long ino, int fsid)
* with d_ino also causes nfsd readdirplus to fail.
*/
inode->i_ino = ino;
if (ovl_same_fs(inode->i_sb)) {
if (ovl_same_fs(ofs)) {
return;
} else if (xinobits && likely(!(ino >> xinoshift))) {
inode->i_ino |= (unsigned long)fsid << (xinoshift + 1);

16
fs/overlayfs/overlayfs.h
View File

@ -494,26 +494,26 @@ static inline bool ovl_is_impuredir(struct super_block *sb,
* d_ino consistent with st_ino.
* With xino=on, we do the same effort but we warn if we failed.
*/
static inline bool ovl_xino_warn(struct super_block *sb)
static inline bool ovl_xino_warn(struct ovl_fs *ofs)
{
return OVL_FS(sb)->config.xino == OVL_XINO_ON;
return ofs->config.xino == OVL_XINO_ON;
}
/* All layers on same fs? */
static inline bool ovl_same_fs(struct super_block *sb)
static inline bool ovl_same_fs(struct ovl_fs *ofs)
{
return OVL_FS(sb)->xino_mode == 0;
return ofs->xino_mode == 0;
}
/* All overlay inodes have same st_dev? */
static inline bool ovl_same_dev(struct super_block *sb)
static inline bool ovl_same_dev(struct ovl_fs *ofs)
{
return OVL_FS(sb)->xino_mode >= 0;
return ofs->xino_mode >= 0;
}
static inline unsigned int ovl_xino_bits(struct super_block *sb)
static inline unsigned int ovl_xino_bits(struct ovl_fs *ofs)
{
return ovl_same_dev(sb) ? OVL_FS(sb)->xino_mode : 0;
return ovl_same_dev(ofs) ? ofs->xino_mode : 0;
}
static inline void ovl_inode_lock(struct inode *inode)

19
fs/overlayfs/readdir.c
View File

@ -118,7 +118,7 @@ static bool ovl_calc_d_ino(struct ovl_readdir_data *rdd,
return false;
/* Always recalc d_ino when remapping lower inode numbers */
if (ovl_xino_bits(rdd->dentry->d_sb))
if (ovl_xino_bits(OVL_FS(rdd->dentry->d_sb)))
return true;
/* Always recalc d_ino for parent */
@ -460,13 +460,14 @@ static int ovl_cache_update_ino(const struct path *path, struct ovl_cache_entry
{
struct dentry *dir = path->dentry;
struct ovl_fs *ofs = OVL_FS(dir->d_sb);
struct dentry *this = NULL;
enum ovl_path_type type;
u64 ino = p->real_ino;
int xinobits = ovl_xino_bits(dir->d_sb);
int xinobits = ovl_xino_bits(ofs);
int err = 0;
if (!ovl_same_dev(dir->d_sb))
if (!ovl_same_dev(ofs))
goto out;
if (p->name[0] == '.') {
@ -515,7 +516,7 @@ static int ovl_cache_update_ino(const struct path *path, struct ovl_cache_entry
ino = ovl_remap_lower_ino(ino, xinobits,
ovl_layer_lower(this)->fsid,
p->name, p->len,
ovl_xino_warn(dir->d_sb));
ovl_xino_warn(ofs));
}
out:
@ -694,12 +695,13 @@ static int ovl_iterate_real(struct file *file, struct dir_context *ctx)
int err;
struct ovl_dir_file *od = file->private_data;
struct dentry *dir = file->f_path.dentry;
struct ovl_fs *ofs = OVL_FS(dir->d_sb);
const struct ovl_layer *lower_layer = ovl_layer_lower(dir);
struct ovl_readdir_translate rdt = {
.ctx.actor = ovl_fill_real,
.orig_ctx = ctx,
.xinobits = ovl_xino_bits(dir->d_sb),
.xinowarn = ovl_xino_warn(dir->d_sb),
.xinobits = ovl_xino_bits(ofs),
.xinowarn = ovl_xino_warn(ofs),
};
if (rdt.xinobits && lower_layer)
@ -735,6 +737,7 @@ static int ovl_iterate(struct file *file, struct dir_context *ctx)
{
struct ovl_dir_file *od = file->private_data;
struct dentry *dentry = file->f_path.dentry;
struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
struct ovl_cache_entry *p;
const struct cred *old_cred;
int err;
@ -749,8 +752,8 @@ static int ovl_iterate(struct file *file, struct dir_context *ctx)
* dir is impure then need to adjust d_ino for copied up
* entries.
*/
if (ovl_xino_bits(dentry->d_sb) ||
(ovl_same_fs(dentry->d_sb) &&
if (ovl_xino_bits(ofs) ||
(ovl_same_fs(ofs) &&
(ovl_is_impure_dir(file) ||
OVL_TYPE_MERGE(ovl_path_type(dentry->d_parent))))) {
err = ovl_iterate_real(file, ctx);

21
fs/overlayfs/super.c
View File

@ -16,6 +16,7 @@
#include <linux/posix_acl_xattr.h>
#include <linux/exportfs.h>
#include <linux/file.h>
#include <linux/fs_parser.h>
#include "overlayfs.h"
MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
@ -334,12 +335,18 @@ static const char *ovl_redirect_mode_def(void)
return ovl_redirect_dir_def ? "on" : "off";
}
static const char * const ovl_xino_str[] = {
"off",
"auto",
"on",
static const struct constant_table ovl_parameter_xino[] = {
{ "off", OVL_XINO_OFF },
{ "auto", OVL_XINO_AUTO },
{ "on", OVL_XINO_ON },
{}
};
static const char *ovl_xino_mode(struct ovl_config *config)
{
return ovl_parameter_xino[config->xino].name;
}
static inline int ovl_xino_def(void)
{
return ovl_xino_auto_def ? OVL_XINO_AUTO : OVL_XINO_OFF;
@ -374,8 +381,8 @@ static int ovl_show_options(struct seq_file *m, struct dentry *dentry)
if (ofs->config.nfs_export != ovl_nfs_export_def)
seq_printf(m, ",nfs_export=%s", ofs->config.nfs_export ?
"on" : "off");
if (ofs->config.xino != ovl_xino_def() && !ovl_same_fs(sb))
seq_printf(m, ",xino=%s", ovl_xino_str[ofs->config.xino]);
if (ofs->config.xino != ovl_xino_def() && !ovl_same_fs(ofs))
seq_printf(m, ",xino=%s", ovl_xino_mode(&ofs->config));
if (ofs->config.metacopy != ovl_metacopy_def)
seq_printf(m, ",metacopy=%s",
ofs->config.metacopy ? "on" : "off");
@ -1566,7 +1573,7 @@ static int ovl_get_fsid(struct ovl_fs *ofs, const struct path *path)
pr_warn("%s uuid detected in lower fs '%pd2', falling back to xino=%s,index=off,nfs_export=off.\n",
uuid_is_null(&sb->s_uuid) ? "null" :
"conflicting",
path->dentry, ovl_xino_str[ofs->config.xino]);
path->dentry, ovl_xino_mode(&ofs->config));
}
}